Commit | Line | Data |
---|---|---|
91d76f53 | 1 | /* |
ab5be9fa MJ |
2 | * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca> |
3 | * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com> | |
91d76f53 | 4 | * |
ab5be9fa | 5 | * SPDX-License-Identifier: GPL-2.0-only |
91d76f53 | 6 | * |
91d76f53 DG |
7 | */ |
8 | ||
6c1c0768 | 9 | #define _LGPL_SOURCE |
7972aab2 | 10 | #include <inttypes.h> |
91d76f53 DG |
11 | #include <pthread.h> |
12 | #include <stdio.h> | |
13 | #include <stdlib.h> | |
099e26bd | 14 | #include <string.h> |
aba8e916 DG |
15 | #include <sys/stat.h> |
16 | #include <sys/types.h> | |
099e26bd | 17 | #include <unistd.h> |
0df502fd | 18 | #include <urcu/compiler.h> |
331744e3 | 19 | #include <signal.h> |
bec39940 | 20 | |
edf4b93e | 21 | #include <common/compat/errno.h> |
990570ed | 22 | #include <common/common.h> |
993578ff JR |
23 | #include <common/hashtable/utils.h> |
24 | #include <lttng/event-rule/event-rule.h> | |
25 | #include <lttng/event-rule/event-rule-internal.h> | |
26 | #include <lttng/event-rule/tracepoint.h> | |
27 | #include <lttng/condition/condition.h> | |
28 | #include <lttng/condition/event-rule-internal.h> | |
29 | #include <lttng/condition/event-rule.h> | |
86acf0da | 30 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 31 | |
7972aab2 | 32 | #include "buffer-registry.h" |
86acf0da | 33 | #include "fd-limit.h" |
8782cc74 | 34 | #include "health-sessiond.h" |
56fff090 | 35 | #include "ust-app.h" |
48842b30 | 36 | #include "ust-consumer.h" |
75018ab6 JG |
37 | #include "lttng-ust-ctl.h" |
38 | #include "lttng-ust-error.h" | |
0b2dc8df | 39 | #include "utils.h" |
fb83fe64 | 40 | #include "session.h" |
e9404c27 JG |
41 | #include "lttng-sessiond.h" |
42 | #include "notification-thread-commands.h" | |
5c408ad8 | 43 | #include "rotate.h" |
d80a6244 | 44 | |
44cdb3a2 MJ |
45 | struct lttng_ht *ust_app_ht; |
46 | struct lttng_ht *ust_app_ht_by_sock; | |
47 | struct lttng_ht *ust_app_ht_by_notify_sock; | |
48 | ||
c4b88406 MD |
49 | static |
50 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
51 | ||
d9bf3ca4 MD |
52 | /* Next available channel key. Access under next_channel_key_lock. */ |
53 | static uint64_t _next_channel_key; | |
54 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
55 | ||
56 | /* Next available session ID. Access under next_session_id_lock. */ | |
57 | static uint64_t _next_session_id; | |
58 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
59 | |
60 | /* | |
d9bf3ca4 | 61 | * Return the incremented value of next_channel_key. |
ffe60014 | 62 | */ |
d9bf3ca4 | 63 | static uint64_t get_next_channel_key(void) |
ffe60014 | 64 | { |
d9bf3ca4 MD |
65 | uint64_t ret; |
66 | ||
67 | pthread_mutex_lock(&next_channel_key_lock); | |
68 | ret = ++_next_channel_key; | |
69 | pthread_mutex_unlock(&next_channel_key_lock); | |
70 | return ret; | |
ffe60014 DG |
71 | } |
72 | ||
73 | /* | |
7972aab2 | 74 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 75 | */ |
d9bf3ca4 | 76 | static uint64_t get_next_session_id(void) |
ffe60014 | 77 | { |
d9bf3ca4 MD |
78 | uint64_t ret; |
79 | ||
80 | pthread_mutex_lock(&next_session_id_lock); | |
81 | ret = ++_next_session_id; | |
82 | pthread_mutex_unlock(&next_session_id_lock); | |
83 | return ret; | |
ffe60014 DG |
84 | } |
85 | ||
d65d2de8 DG |
86 | static void copy_channel_attr_to_ustctl( |
87 | struct ustctl_consumer_channel_attr *attr, | |
88 | struct lttng_ust_channel_attr *uattr) | |
89 | { | |
90 | /* Copy event attributes since the layout is different. */ | |
91 | attr->subbuf_size = uattr->subbuf_size; | |
92 | attr->num_subbuf = uattr->num_subbuf; | |
93 | attr->overwrite = uattr->overwrite; | |
94 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
95 | attr->read_timer_interval = uattr->read_timer_interval; | |
96 | attr->output = uattr->output; | |
491d1539 | 97 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
98 | } |
99 | ||
025faf73 DG |
100 | /* |
101 | * Match function for the hash table lookup. | |
102 | * | |
103 | * It matches an ust app event based on three attributes which are the event | |
104 | * name, the filter bytecode and the loglevel. | |
105 | */ | |
18eace3b DG |
106 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
107 | { | |
108 | struct ust_app_event *event; | |
109 | const struct ust_app_ht_key *key; | |
2106efa0 | 110 | int ev_loglevel_value; |
18eace3b DG |
111 | |
112 | assert(node); | |
113 | assert(_key); | |
114 | ||
115 | event = caa_container_of(node, struct ust_app_event, node.node); | |
116 | key = _key; | |
2106efa0 | 117 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 118 | |
1af53eb5 | 119 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
120 | |
121 | /* Event name */ | |
122 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
123 | goto no_match; | |
124 | } | |
125 | ||
126 | /* Event loglevel. */ | |
2106efa0 | 127 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 128 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
129 | && key->loglevel_type == 0 && |
130 | ev_loglevel_value == -1) { | |
025faf73 DG |
131 | /* |
132 | * Match is accepted. This is because on event creation, the | |
133 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
134 | * -1 are accepted for this loglevel type since 0 is the one set by | |
135 | * the API when receiving an enable event. | |
136 | */ | |
137 | } else { | |
138 | goto no_match; | |
139 | } | |
18eace3b DG |
140 | } |
141 | ||
142 | /* One of the filters is NULL, fail. */ | |
143 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
144 | goto no_match; | |
145 | } | |
146 | ||
025faf73 DG |
147 | if (key->filter && event->filter) { |
148 | /* Both filters exists, check length followed by the bytecode. */ | |
149 | if (event->filter->len != key->filter->len || | |
150 | memcmp(event->filter->data, key->filter->data, | |
151 | event->filter->len) != 0) { | |
152 | goto no_match; | |
153 | } | |
18eace3b DG |
154 | } |
155 | ||
1af53eb5 JI |
156 | /* One of the exclusions is NULL, fail. */ |
157 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
158 | goto no_match; | |
159 | } | |
160 | ||
161 | if (key->exclusion && event->exclusion) { | |
162 | /* Both exclusions exists, check count followed by the names. */ | |
163 | if (event->exclusion->count != key->exclusion->count || | |
164 | memcmp(event->exclusion->names, key->exclusion->names, | |
165 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
166 | goto no_match; | |
167 | } | |
168 | } | |
169 | ||
170 | ||
025faf73 | 171 | /* Match. */ |
18eace3b DG |
172 | return 1; |
173 | ||
174 | no_match: | |
175 | return 0; | |
18eace3b DG |
176 | } |
177 | ||
025faf73 DG |
178 | /* |
179 | * Unique add of an ust app event in the given ht. This uses the custom | |
180 | * ht_match_ust_app_event match function and the event name as hash. | |
181 | */ | |
d0b96690 | 182 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
183 | struct ust_app_event *event) |
184 | { | |
185 | struct cds_lfht_node *node_ptr; | |
186 | struct ust_app_ht_key key; | |
d0b96690 | 187 | struct lttng_ht *ht; |
18eace3b | 188 | |
d0b96690 DG |
189 | assert(ua_chan); |
190 | assert(ua_chan->events); | |
18eace3b DG |
191 | assert(event); |
192 | ||
d0b96690 | 193 | ht = ua_chan->events; |
18eace3b DG |
194 | key.name = event->attr.name; |
195 | key.filter = event->filter; | |
2106efa0 | 196 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 197 | key.exclusion = event->exclusion; |
18eace3b DG |
198 | |
199 | node_ptr = cds_lfht_add_unique(ht->ht, | |
200 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
201 | ht_match_ust_app_event, &key, &event->node.node); | |
202 | assert(node_ptr == &event->node.node); | |
203 | } | |
204 | ||
d88aee68 DG |
205 | /* |
206 | * Close the notify socket from the given RCU head object. This MUST be called | |
207 | * through a call_rcu(). | |
208 | */ | |
209 | static void close_notify_sock_rcu(struct rcu_head *head) | |
210 | { | |
211 | int ret; | |
212 | struct ust_app_notify_sock_obj *obj = | |
213 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
214 | ||
215 | /* Must have a valid fd here. */ | |
216 | assert(obj->fd >= 0); | |
217 | ||
218 | ret = close(obj->fd); | |
219 | if (ret) { | |
220 | ERR("close notify sock %d RCU", obj->fd); | |
221 | } | |
222 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
223 | ||
224 | free(obj); | |
225 | } | |
226 | ||
7972aab2 DG |
227 | /* |
228 | * Return the session registry according to the buffer type of the given | |
229 | * session. | |
230 | * | |
231 | * A registry per UID object MUST exists before calling this function or else | |
232 | * it assert() if not found. RCU read side lock must be acquired. | |
233 | */ | |
234 | static struct ust_registry_session *get_session_registry( | |
235 | struct ust_app_session *ua_sess) | |
236 | { | |
237 | struct ust_registry_session *registry = NULL; | |
238 | ||
239 | assert(ua_sess); | |
240 | ||
241 | switch (ua_sess->buffer_type) { | |
242 | case LTTNG_BUFFER_PER_PID: | |
243 | { | |
244 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
245 | if (!reg_pid) { | |
246 | goto error; | |
247 | } | |
248 | registry = reg_pid->registry->reg.ust; | |
249 | break; | |
250 | } | |
251 | case LTTNG_BUFFER_PER_UID: | |
252 | { | |
253 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 | 254 | ua_sess->tracing_id, ua_sess->bits_per_long, |
ff588497 | 255 | lttng_credentials_get_uid(&ua_sess->real_credentials)); |
7972aab2 DG |
256 | if (!reg_uid) { |
257 | goto error; | |
258 | } | |
259 | registry = reg_uid->registry->reg.ust; | |
260 | break; | |
261 | } | |
262 | default: | |
263 | assert(0); | |
264 | }; | |
265 | ||
266 | error: | |
267 | return registry; | |
268 | } | |
269 | ||
55cc08a6 DG |
270 | /* |
271 | * Delete ust context safely. RCU read lock must be held before calling | |
272 | * this function. | |
273 | */ | |
274 | static | |
fb45065e MD |
275 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
276 | struct ust_app *app) | |
55cc08a6 | 277 | { |
ffe60014 DG |
278 | int ret; |
279 | ||
280 | assert(ua_ctx); | |
281 | ||
55cc08a6 | 282 | if (ua_ctx->obj) { |
fb45065e | 283 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 284 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 285 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
286 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
287 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
288 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 289 | } |
55cc08a6 DG |
290 | free(ua_ctx->obj); |
291 | } | |
292 | free(ua_ctx); | |
293 | } | |
294 | ||
d80a6244 DG |
295 | /* |
296 | * Delete ust app event safely. RCU read lock must be held before calling | |
297 | * this function. | |
298 | */ | |
8b366481 | 299 | static |
fb45065e MD |
300 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
301 | struct ust_app *app) | |
d80a6244 | 302 | { |
ffe60014 DG |
303 | int ret; |
304 | ||
305 | assert(ua_event); | |
306 | ||
53a80697 | 307 | free(ua_event->filter); |
951f0b71 JI |
308 | if (ua_event->exclusion != NULL) |
309 | free(ua_event->exclusion); | |
edb67388 | 310 | if (ua_event->obj != NULL) { |
fb45065e | 311 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 312 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 313 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
314 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
315 | ERR("UST app sock %d release event obj failed with ret %d", | |
316 | sock, ret); | |
317 | } | |
edb67388 DG |
318 | free(ua_event->obj); |
319 | } | |
d80a6244 DG |
320 | free(ua_event); |
321 | } | |
322 | ||
993578ff JR |
323 | /* |
324 | * Delayed reclaim of a ust_app_event_notifier_rule object. This MUST be called | |
325 | * through a call_rcu(). | |
326 | */ | |
327 | static | |
328 | void free_ust_app_event_notifier_rule_rcu(struct rcu_head *head) | |
329 | { | |
330 | struct ust_app_event_notifier_rule *obj = caa_container_of( | |
331 | head, struct ust_app_event_notifier_rule, rcu_head); | |
332 | ||
333 | free(obj); | |
334 | } | |
335 | ||
336 | /* | |
337 | * Delete ust app event notifier rule safely. | |
338 | */ | |
339 | static void delete_ust_app_event_notifier_rule(int sock, | |
340 | struct ust_app_event_notifier_rule *ua_event_notifier_rule, | |
341 | struct ust_app *app) | |
342 | { | |
343 | int ret; | |
344 | ||
345 | assert(ua_event_notifier_rule); | |
346 | ||
347 | if (ua_event_notifier_rule->exclusion != NULL) { | |
348 | free(ua_event_notifier_rule->exclusion); | |
349 | } | |
350 | ||
351 | if (ua_event_notifier_rule->obj != NULL) { | |
352 | pthread_mutex_lock(&app->sock_lock); | |
353 | ret = ustctl_release_object(sock, ua_event_notifier_rule->obj); | |
354 | pthread_mutex_unlock(&app->sock_lock); | |
355 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
356 | ERR("Failed to release event notifier object: app = '%s' (ppid %d), ret = %d", | |
357 | app->name, (int) app->ppid, ret); | |
358 | } | |
359 | ||
360 | free(ua_event_notifier_rule->obj); | |
361 | } | |
362 | ||
363 | lttng_event_rule_put(ua_event_notifier_rule->event_rule); | |
364 | call_rcu(&ua_event_notifier_rule->rcu_head, | |
365 | free_ust_app_event_notifier_rule_rcu); | |
366 | } | |
367 | ||
d80a6244 | 368 | /* |
7972aab2 DG |
369 | * Release ust data object of the given stream. |
370 | * | |
371 | * Return 0 on success or else a negative value. | |
d80a6244 | 372 | */ |
fb45065e MD |
373 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
374 | struct ust_app *app) | |
d80a6244 | 375 | { |
7972aab2 | 376 | int ret = 0; |
ffe60014 DG |
377 | |
378 | assert(stream); | |
379 | ||
8b366481 | 380 | if (stream->obj) { |
fb45065e | 381 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 382 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 383 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
384 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
385 | ERR("UST app sock %d release stream obj failed with ret %d", | |
386 | sock, ret); | |
387 | } | |
4063050c | 388 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
389 | free(stream->obj); |
390 | } | |
7972aab2 DG |
391 | |
392 | return ret; | |
393 | } | |
394 | ||
395 | /* | |
396 | * Delete ust app stream safely. RCU read lock must be held before calling | |
397 | * this function. | |
398 | */ | |
399 | static | |
fb45065e MD |
400 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
401 | struct ust_app *app) | |
7972aab2 DG |
402 | { |
403 | assert(stream); | |
404 | ||
fb45065e | 405 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 406 | free(stream); |
d80a6244 DG |
407 | } |
408 | ||
36b588ed MD |
409 | /* |
410 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
411 | * section and outside of call_rcu thread, so we postpone its execution |
412 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
413 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
414 | */ |
415 | static | |
416 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
417 | { | |
418 | struct ust_app_channel *ua_chan = | |
419 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
420 | ||
0b2dc8df MD |
421 | ht_cleanup_push(ua_chan->ctx); |
422 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
423 | free(ua_chan); |
424 | } | |
425 | ||
fb83fe64 JD |
426 | /* |
427 | * Extract the lost packet or discarded events counter when the channel is | |
428 | * being deleted and store the value in the parent channel so we can | |
429 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
430 | * |
431 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
432 | */ |
433 | static | |
434 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
435 | { | |
436 | uint64_t discarded = 0, lost = 0; | |
437 | struct ltt_session *session; | |
438 | struct ltt_ust_channel *uchan; | |
439 | ||
440 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
441 | return; | |
442 | } | |
443 | ||
444 | rcu_read_lock(); | |
445 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
446 | if (!session || !session->ust_session) { |
447 | /* | |
448 | * Not finding the session is not an error because there are | |
449 | * multiple ways the channels can be torn down. | |
450 | * | |
451 | * 1) The session daemon can initiate the destruction of the | |
452 | * ust app session after receiving a destroy command or | |
453 | * during its shutdown/teardown. | |
454 | * 2) The application, since we are in per-pid tracing, is | |
455 | * unregistering and tearing down its ust app session. | |
456 | * | |
457 | * Both paths are protected by the session list lock which | |
458 | * ensures that the accounting of lost packets and discarded | |
459 | * events is done exactly once. The session is then unpublished | |
460 | * from the session list, resulting in this condition. | |
461 | */ | |
fb83fe64 JD |
462 | goto end; |
463 | } | |
464 | ||
465 | if (ua_chan->attr.overwrite) { | |
466 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
467 | ua_chan->key, session->ust_session->consumer, | |
468 | &lost); | |
469 | } else { | |
470 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
471 | ua_chan->key, session->ust_session->consumer, | |
472 | &discarded); | |
473 | } | |
474 | uchan = trace_ust_find_channel_by_name( | |
475 | session->ust_session->domain_global.channels, | |
476 | ua_chan->name); | |
477 | if (!uchan) { | |
478 | ERR("Missing UST channel to store discarded counters"); | |
479 | goto end; | |
480 | } | |
481 | ||
482 | uchan->per_pid_closed_app_discarded += discarded; | |
483 | uchan->per_pid_closed_app_lost += lost; | |
484 | ||
485 | end: | |
486 | rcu_read_unlock(); | |
e32d7f27 JG |
487 | if (session) { |
488 | session_put(session); | |
489 | } | |
fb83fe64 JD |
490 | } |
491 | ||
d80a6244 DG |
492 | /* |
493 | * Delete ust app channel safely. RCU read lock must be held before calling | |
494 | * this function. | |
82cac6d2 JG |
495 | * |
496 | * The session list lock must be held by the caller. | |
d80a6244 | 497 | */ |
8b366481 | 498 | static |
d0b96690 DG |
499 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
500 | struct ust_app *app) | |
d80a6244 DG |
501 | { |
502 | int ret; | |
bec39940 | 503 | struct lttng_ht_iter iter; |
d80a6244 | 504 | struct ust_app_event *ua_event; |
55cc08a6 | 505 | struct ust_app_ctx *ua_ctx; |
030a66fa | 506 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 507 | struct ust_registry_session *registry; |
d80a6244 | 508 | |
ffe60014 DG |
509 | assert(ua_chan); |
510 | ||
511 | DBG3("UST app deleting channel %s", ua_chan->name); | |
512 | ||
55cc08a6 | 513 | /* Wipe stream */ |
d80a6244 | 514 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 515 | cds_list_del(&stream->list); |
fb45065e | 516 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
517 | } |
518 | ||
55cc08a6 | 519 | /* Wipe context */ |
bec39940 | 520 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 521 | cds_list_del(&ua_ctx->list); |
bec39940 | 522 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 523 | assert(!ret); |
fb45065e | 524 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 525 | } |
d80a6244 | 526 | |
55cc08a6 | 527 | /* Wipe events */ |
bec39940 DG |
528 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
529 | node.node) { | |
530 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 531 | assert(!ret); |
fb45065e | 532 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 533 | } |
edb67388 | 534 | |
c8335706 MD |
535 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
536 | /* Wipe and free registry from session registry. */ | |
537 | registry = get_session_registry(ua_chan->session); | |
538 | if (registry) { | |
e9404c27 | 539 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
540 | sock >= 0); |
541 | } | |
45798a31 JG |
542 | /* |
543 | * A negative socket can be used by the caller when | |
544 | * cleaning-up a ua_chan in an error path. Skip the | |
545 | * accounting in this case. | |
546 | */ | |
e38d96f9 MD |
547 | if (sock >= 0) { |
548 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 549 | } |
7972aab2 | 550 | } |
d0b96690 | 551 | |
edb67388 | 552 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
553 | /* Remove channel from application UST object descriptor. */ |
554 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
555 | ret = lttng_ht_del(app->ust_objd, &iter); |
556 | assert(!ret); | |
fb45065e | 557 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 558 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 559 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
560 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
561 | ERR("UST app sock %d release channel obj failed with ret %d", | |
562 | sock, ret); | |
563 | } | |
7972aab2 | 564 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
565 | free(ua_chan->obj); |
566 | } | |
36b588ed | 567 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
568 | } |
569 | ||
fb45065e MD |
570 | int ust_app_register_done(struct ust_app *app) |
571 | { | |
572 | int ret; | |
573 | ||
574 | pthread_mutex_lock(&app->sock_lock); | |
575 | ret = ustctl_register_done(app->sock); | |
576 | pthread_mutex_unlock(&app->sock_lock); | |
577 | return ret; | |
578 | } | |
579 | ||
580 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
581 | { | |
582 | int ret, sock; | |
583 | ||
584 | if (app) { | |
585 | pthread_mutex_lock(&app->sock_lock); | |
586 | sock = app->sock; | |
587 | } else { | |
588 | sock = -1; | |
589 | } | |
590 | ret = ustctl_release_object(sock, data); | |
591 | if (app) { | |
592 | pthread_mutex_unlock(&app->sock_lock); | |
593 | } | |
594 | return ret; | |
595 | } | |
596 | ||
331744e3 | 597 | /* |
1b532a60 DG |
598 | * Push metadata to consumer socket. |
599 | * | |
dc2bbdae MD |
600 | * RCU read-side lock must be held to guarantee existance of socket. |
601 | * Must be called with the ust app session lock held. | |
602 | * Must be called with the registry lock held. | |
331744e3 JD |
603 | * |
604 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
605 | * Returning a -EPIPE return value means we could not send the metadata, |
606 | * but it can be caused by recoverable errors (e.g. the application has | |
607 | * terminated concurrently). | |
331744e3 JD |
608 | */ |
609 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
610 | struct consumer_socket *socket, int send_zero_data) | |
611 | { | |
612 | int ret; | |
613 | char *metadata_str = NULL; | |
c585821b | 614 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 615 | ssize_t ret_val; |
93ec662e | 616 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
617 | |
618 | assert(registry); | |
619 | assert(socket); | |
1b532a60 | 620 | |
c585821b MD |
621 | metadata_key = registry->metadata_key; |
622 | ||
ce34fcd0 | 623 | /* |
dc2bbdae MD |
624 | * Means that no metadata was assigned to the session. This can |
625 | * happens if no start has been done previously. | |
ce34fcd0 | 626 | */ |
c585821b | 627 | if (!metadata_key) { |
ce34fcd0 MD |
628 | return 0; |
629 | } | |
630 | ||
331744e3 JD |
631 | offset = registry->metadata_len_sent; |
632 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 633 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 634 | metadata_version = registry->metadata_version; |
331744e3 JD |
635 | if (len == 0) { |
636 | DBG3("No metadata to push for metadata key %" PRIu64, | |
637 | registry->metadata_key); | |
638 | ret_val = len; | |
639 | if (send_zero_data) { | |
640 | DBG("No metadata to push"); | |
641 | goto push_data; | |
642 | } | |
643 | goto end; | |
644 | } | |
645 | ||
646 | /* Allocate only what we have to send. */ | |
647 | metadata_str = zmalloc(len); | |
648 | if (!metadata_str) { | |
649 | PERROR("zmalloc ust app metadata string"); | |
650 | ret_val = -ENOMEM; | |
651 | goto error; | |
652 | } | |
c585821b | 653 | /* Copy what we haven't sent out. */ |
331744e3 | 654 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
655 | |
656 | push_data: | |
c585821b MD |
657 | pthread_mutex_unlock(®istry->lock); |
658 | /* | |
659 | * We need to unlock the registry while we push metadata to | |
660 | * break a circular dependency between the consumerd metadata | |
661 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
662 | * to the consumerd awaits that it gets pushed all the way to | |
663 | * relayd, but doing so requires grabbing the metadata lock. If | |
664 | * a concurrent metadata request is being performed by | |
665 | * consumerd, this can try to grab the registry lock on the | |
666 | * sessiond while holding the metadata lock on the consumer | |
667 | * daemon. Those push and pull schemes are performed on two | |
668 | * different bidirectionnal communication sockets. | |
669 | */ | |
670 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 671 | metadata_str, len, offset, metadata_version); |
c585821b | 672 | pthread_mutex_lock(®istry->lock); |
331744e3 | 673 | if (ret < 0) { |
000baf6a | 674 | /* |
dc2bbdae MD |
675 | * There is an acceptable race here between the registry |
676 | * metadata key assignment and the creation on the | |
677 | * consumer. The session daemon can concurrently push | |
678 | * metadata for this registry while being created on the | |
679 | * consumer since the metadata key of the registry is | |
680 | * assigned *before* it is setup to avoid the consumer | |
681 | * to ask for metadata that could possibly be not found | |
682 | * in the session daemon. | |
000baf6a | 683 | * |
dc2bbdae MD |
684 | * The metadata will get pushed either by the session |
685 | * being stopped or the consumer requesting metadata if | |
686 | * that race is triggered. | |
000baf6a DG |
687 | */ |
688 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
689 | ret = 0; | |
c585821b MD |
690 | } else { |
691 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 692 | } |
331744e3 JD |
693 | ret_val = ret; |
694 | goto error_push; | |
c585821b MD |
695 | } else { |
696 | /* | |
697 | * Metadata may have been concurrently pushed, since | |
698 | * we're not holding the registry lock while pushing to | |
699 | * consumer. This is handled by the fact that we send | |
700 | * the metadata content, size, and the offset at which | |
701 | * that metadata belongs. This may arrive out of order | |
702 | * on the consumer side, and the consumer is able to | |
703 | * deal with overlapping fragments. The consumer | |
704 | * supports overlapping fragments, which must be | |
705 | * contiguous starting from offset 0. We keep the | |
706 | * largest metadata_len_sent value of the concurrent | |
707 | * send. | |
708 | */ | |
709 | registry->metadata_len_sent = | |
710 | max_t(size_t, registry->metadata_len_sent, | |
711 | new_metadata_len_sent); | |
331744e3 | 712 | } |
331744e3 JD |
713 | free(metadata_str); |
714 | return len; | |
715 | ||
716 | end: | |
717 | error: | |
ce34fcd0 MD |
718 | if (ret_val) { |
719 | /* | |
dc2bbdae MD |
720 | * On error, flag the registry that the metadata is |
721 | * closed. We were unable to push anything and this | |
722 | * means that either the consumer is not responding or | |
723 | * the metadata cache has been destroyed on the | |
724 | * consumer. | |
ce34fcd0 MD |
725 | */ |
726 | registry->metadata_closed = 1; | |
727 | } | |
331744e3 JD |
728 | error_push: |
729 | free(metadata_str); | |
730 | return ret_val; | |
731 | } | |
732 | ||
d88aee68 | 733 | /* |
ce34fcd0 | 734 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
735 | * Either sock or consumer is required : if sock is NULL, the default |
736 | * socket to send the metadata is retrieved from consumer, if sock | |
737 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 738 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
739 | * therefore ensuring existance of registry. It also ensures existance |
740 | * of socket throughout this function. | |
d88aee68 DG |
741 | * |
742 | * Return 0 on success else a negative error. | |
2c57e06d MD |
743 | * Returning a -EPIPE return value means we could not send the metadata, |
744 | * but it can be caused by recoverable errors (e.g. the application has | |
745 | * terminated concurrently). | |
d88aee68 | 746 | */ |
7972aab2 DG |
747 | static int push_metadata(struct ust_registry_session *registry, |
748 | struct consumer_output *consumer) | |
d88aee68 | 749 | { |
331744e3 JD |
750 | int ret_val; |
751 | ssize_t ret; | |
d88aee68 DG |
752 | struct consumer_socket *socket; |
753 | ||
7972aab2 DG |
754 | assert(registry); |
755 | assert(consumer); | |
756 | ||
ce34fcd0 | 757 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 758 | if (registry->metadata_closed) { |
dc2bbdae MD |
759 | ret_val = -EPIPE; |
760 | goto error; | |
d88aee68 DG |
761 | } |
762 | ||
d88aee68 | 763 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
764 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
765 | consumer); | |
d88aee68 | 766 | if (!socket) { |
331744e3 | 767 | ret_val = -1; |
ce34fcd0 | 768 | goto error; |
d88aee68 DG |
769 | } |
770 | ||
331744e3 | 771 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 772 | if (ret < 0) { |
331744e3 | 773 | ret_val = ret; |
ce34fcd0 | 774 | goto error; |
d88aee68 | 775 | } |
dc2bbdae | 776 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
777 | return 0; |
778 | ||
ce34fcd0 | 779 | error: |
dc2bbdae | 780 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 781 | return ret_val; |
d88aee68 DG |
782 | } |
783 | ||
784 | /* | |
785 | * Send to the consumer a close metadata command for the given session. Once | |
786 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 787 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
788 | * in the destroy path. |
789 | * | |
a70ac2f4 MD |
790 | * Do not hold the registry lock while communicating with the consumerd, because |
791 | * doing so causes inter-process deadlocks between consumerd and sessiond with | |
792 | * the metadata request notification. | |
793 | * | |
d88aee68 DG |
794 | * Return 0 on success else a negative value. |
795 | */ | |
7972aab2 DG |
796 | static int close_metadata(struct ust_registry_session *registry, |
797 | struct consumer_output *consumer) | |
d88aee68 DG |
798 | { |
799 | int ret; | |
800 | struct consumer_socket *socket; | |
a70ac2f4 MD |
801 | uint64_t metadata_key; |
802 | bool registry_was_already_closed; | |
d88aee68 | 803 | |
7972aab2 DG |
804 | assert(registry); |
805 | assert(consumer); | |
d88aee68 | 806 | |
7972aab2 DG |
807 | rcu_read_lock(); |
808 | ||
ce34fcd0 | 809 | pthread_mutex_lock(®istry->lock); |
a70ac2f4 MD |
810 | metadata_key = registry->metadata_key; |
811 | registry_was_already_closed = registry->metadata_closed; | |
812 | if (metadata_key != 0) { | |
813 | /* | |
814 | * Metadata closed. Even on error this means that the consumer | |
815 | * is not responding or not found so either way a second close | |
816 | * should NOT be emit for this registry. | |
817 | */ | |
818 | registry->metadata_closed = 1; | |
819 | } | |
820 | pthread_mutex_unlock(®istry->lock); | |
ce34fcd0 | 821 | |
a70ac2f4 | 822 | if (metadata_key == 0 || registry_was_already_closed) { |
d88aee68 | 823 | ret = 0; |
1b532a60 | 824 | goto end; |
d88aee68 DG |
825 | } |
826 | ||
d88aee68 | 827 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
828 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
829 | consumer); | |
d88aee68 DG |
830 | if (!socket) { |
831 | ret = -1; | |
a70ac2f4 | 832 | goto end; |
d88aee68 DG |
833 | } |
834 | ||
a70ac2f4 | 835 | ret = consumer_close_metadata(socket, metadata_key); |
d88aee68 | 836 | if (ret < 0) { |
a70ac2f4 | 837 | goto end; |
d88aee68 DG |
838 | } |
839 | ||
1b532a60 | 840 | end: |
7972aab2 | 841 | rcu_read_unlock(); |
d88aee68 DG |
842 | return ret; |
843 | } | |
844 | ||
36b588ed MD |
845 | /* |
846 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
847 | * section and outside of call_rcu thread, so we postpone its execution |
848 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
849 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
850 | */ |
851 | static | |
852 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
853 | { | |
854 | struct ust_app_session *ua_sess = | |
855 | caa_container_of(head, struct ust_app_session, rcu_head); | |
856 | ||
0b2dc8df | 857 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
858 | free(ua_sess); |
859 | } | |
860 | ||
d80a6244 DG |
861 | /* |
862 | * Delete ust app session safely. RCU read lock must be held before calling | |
863 | * this function. | |
82cac6d2 JG |
864 | * |
865 | * The session list lock must be held by the caller. | |
d80a6244 | 866 | */ |
8b366481 | 867 | static |
d0b96690 DG |
868 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
869 | struct ust_app *app) | |
d80a6244 DG |
870 | { |
871 | int ret; | |
bec39940 | 872 | struct lttng_ht_iter iter; |
d80a6244 | 873 | struct ust_app_channel *ua_chan; |
7972aab2 | 874 | struct ust_registry_session *registry; |
d80a6244 | 875 | |
d88aee68 DG |
876 | assert(ua_sess); |
877 | ||
1b532a60 DG |
878 | pthread_mutex_lock(&ua_sess->lock); |
879 | ||
b161602a MD |
880 | assert(!ua_sess->deleted); |
881 | ua_sess->deleted = true; | |
882 | ||
7972aab2 | 883 | registry = get_session_registry(ua_sess); |
fad1ed2f | 884 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 885 | if (registry) { |
d88aee68 | 886 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 887 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 888 | |
7972aab2 DG |
889 | /* |
890 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
891 | * metadata only on destroy trace session in this case. Also, the |
892 | * previous push metadata could have flag the metadata registry to | |
893 | * close so don't send a close command if closed. | |
7972aab2 | 894 | */ |
ce34fcd0 | 895 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
896 | /* And ask to close it for this session registry. */ |
897 | (void) close_metadata(registry, ua_sess->consumer); | |
898 | } | |
d80a6244 DG |
899 | } |
900 | ||
bec39940 DG |
901 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
902 | node.node) { | |
903 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 904 | assert(!ret); |
d0b96690 | 905 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 906 | } |
d80a6244 | 907 | |
7972aab2 DG |
908 | /* In case of per PID, the registry is kept in the session. */ |
909 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
910 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
911 | if (reg_pid) { | |
fad1ed2f JR |
912 | /* |
913 | * Registry can be null on error path during | |
914 | * initialization. | |
915 | */ | |
7972aab2 DG |
916 | buffer_reg_pid_remove(reg_pid); |
917 | buffer_reg_pid_destroy(reg_pid); | |
918 | } | |
919 | } | |
d0b96690 | 920 | |
aee6bafd | 921 | if (ua_sess->handle != -1) { |
fb45065e | 922 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 923 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 924 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
925 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
926 | ERR("UST app sock %d release session handle failed with ret %d", | |
927 | sock, ret); | |
928 | } | |
10b56aef MD |
929 | /* Remove session from application UST object descriptor. */ |
930 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
931 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
932 | assert(!ret); | |
aee6bafd | 933 | } |
10b56aef | 934 | |
1b532a60 DG |
935 | pthread_mutex_unlock(&ua_sess->lock); |
936 | ||
6addfa37 MD |
937 | consumer_output_put(ua_sess->consumer); |
938 | ||
36b588ed | 939 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 940 | } |
91d76f53 DG |
941 | |
942 | /* | |
284d8f55 DG |
943 | * Delete a traceable application structure from the global list. Never call |
944 | * this function outside of a call_rcu call. | |
36b588ed MD |
945 | * |
946 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 947 | */ |
8b366481 DG |
948 | static |
949 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 950 | { |
8b366481 | 951 | int ret, sock; |
d42f20df | 952 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
993578ff JR |
953 | struct lttng_ht_iter iter; |
954 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5e2abfaf | 955 | bool event_notifier_write_fd_is_open; |
44d3bd01 | 956 | |
82cac6d2 JG |
957 | /* |
958 | * The session list lock must be held during this function to guarantee | |
959 | * the existence of ua_sess. | |
960 | */ | |
961 | session_lock_list(); | |
d80a6244 | 962 | /* Delete ust app sessions info */ |
852d0037 DG |
963 | sock = app->sock; |
964 | app->sock = -1; | |
d80a6244 | 965 | |
8b366481 | 966 | /* Wipe sessions */ |
d42f20df DG |
967 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
968 | teardown_node) { | |
969 | /* Free every object in the session and the session. */ | |
36b588ed | 970 | rcu_read_lock(); |
d0b96690 | 971 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 972 | rcu_read_unlock(); |
d80a6244 | 973 | } |
36b588ed | 974 | |
993578ff JR |
975 | /* Remove the event notifier rules associated with this app. */ |
976 | rcu_read_lock(); | |
977 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
978 | &iter.iter, event_notifier_rule, node.node) { | |
979 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, &iter); | |
980 | assert(!ret); | |
981 | ||
982 | delete_ust_app_event_notifier_rule( | |
983 | app->sock, event_notifier_rule, app); | |
984 | } | |
985 | ||
986 | rcu_read_unlock(); | |
987 | ||
0b2dc8df | 988 | ht_cleanup_push(app->sessions); |
10b56aef | 989 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 990 | ht_cleanup_push(app->ust_objd); |
993578ff | 991 | ht_cleanup_push(app->token_to_event_notifier_rule_ht); |
d80a6244 | 992 | |
da873412 JR |
993 | /* |
994 | * This could be NULL if the event notifier setup failed (e.g the app | |
995 | * was killed or the tracer does not support this feature). | |
996 | */ | |
997 | if (app->event_notifier_group.object) { | |
998 | enum lttng_error_code ret_code; | |
999 | const int event_notifier_read_fd = lttng_pipe_get_readfd( | |
1000 | app->event_notifier_group.event_pipe); | |
1001 | ||
1002 | ret_code = notification_thread_command_remove_tracer_event_source( | |
1003 | notification_thread_handle, | |
1004 | event_notifier_read_fd); | |
1005 | if (ret_code != LTTNG_OK) { | |
1006 | ERR("Failed to remove application tracer event source from notification thread"); | |
1007 | } | |
1008 | ||
1009 | ustctl_release_object(sock, app->event_notifier_group.object); | |
1010 | free(app->event_notifier_group.object); | |
1011 | } | |
1012 | ||
5e2abfaf JG |
1013 | event_notifier_write_fd_is_open = lttng_pipe_is_write_open( |
1014 | app->event_notifier_group.event_pipe); | |
da873412 | 1015 | lttng_pipe_destroy(app->event_notifier_group.event_pipe); |
5e2abfaf JG |
1016 | /* |
1017 | * Release the file descriptors reserved for the event notifier pipe. | |
1018 | * The app could be destroyed before the write end of the pipe could be | |
1019 | * passed to the application (and closed). In that case, both file | |
1020 | * descriptors must be released. | |
1021 | */ | |
1022 | lttng_fd_put(LTTNG_FD_APPS, event_notifier_write_fd_is_open ? 2 : 1); | |
da873412 | 1023 | |
6414a713 | 1024 | /* |
852d0037 DG |
1025 | * Wait until we have deleted the application from the sock hash table |
1026 | * before closing this socket, otherwise an application could re-use the | |
1027 | * socket ID and race with the teardown, using the same hash table entry. | |
1028 | * | |
1029 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
1030 | * all RCU readers that could run concurrently with unregister app, | |
1031 | * therefore we _need_ to only close that socket after a grace period. So | |
1032 | * it should stay in this RCU callback. | |
1033 | * | |
1034 | * This close() is a very important step of the synchronization model so | |
1035 | * every modification to this function must be carefully reviewed. | |
6414a713 | 1036 | */ |
799e2c4f MD |
1037 | ret = close(sock); |
1038 | if (ret) { | |
1039 | PERROR("close"); | |
1040 | } | |
4063050c | 1041 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 1042 | |
852d0037 | 1043 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 1044 | free(app); |
82cac6d2 | 1045 | session_unlock_list(); |
099e26bd DG |
1046 | } |
1047 | ||
1048 | /* | |
f6a9efaa | 1049 | * URCU intermediate call to delete an UST app. |
099e26bd | 1050 | */ |
8b366481 DG |
1051 | static |
1052 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 1053 | { |
bec39940 DG |
1054 | struct lttng_ht_node_ulong *node = |
1055 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 1056 | struct ust_app *app = |
852d0037 | 1057 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 1058 | |
852d0037 | 1059 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 1060 | delete_ust_app(app); |
099e26bd DG |
1061 | } |
1062 | ||
ffe60014 DG |
1063 | /* |
1064 | * Delete the session from the application ht and delete the data structure by | |
1065 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
1066 | * |
1067 | * The session list lock must be held by the caller. | |
ffe60014 | 1068 | */ |
d0b96690 | 1069 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
1070 | struct ust_app_session *ua_sess) |
1071 | { | |
1072 | int ret; | |
1073 | struct lttng_ht_iter iter; | |
1074 | ||
1075 | assert(app); | |
1076 | assert(ua_sess); | |
1077 | ||
1078 | iter.iter.node = &ua_sess->node.node; | |
1079 | ret = lttng_ht_del(app->sessions, &iter); | |
1080 | if (ret) { | |
1081 | /* Already scheduled for teardown. */ | |
1082 | goto end; | |
1083 | } | |
1084 | ||
1085 | /* Once deleted, free the data structure. */ | |
d0b96690 | 1086 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
1087 | |
1088 | end: | |
1089 | return; | |
1090 | } | |
1091 | ||
8b366481 DG |
1092 | /* |
1093 | * Alloc new UST app session. | |
1094 | */ | |
1095 | static | |
40bbd087 | 1096 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
1097 | { |
1098 | struct ust_app_session *ua_sess; | |
1099 | ||
1100 | /* Init most of the default value by allocating and zeroing */ | |
1101 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
1102 | if (ua_sess == NULL) { | |
1103 | PERROR("malloc"); | |
ffe60014 | 1104 | goto error_free; |
8b366481 DG |
1105 | } |
1106 | ||
1107 | ua_sess->handle = -1; | |
bec39940 | 1108 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1109 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1110 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1111 | |
8b366481 DG |
1112 | return ua_sess; |
1113 | ||
ffe60014 | 1114 | error_free: |
8b366481 DG |
1115 | return NULL; |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * Alloc new UST app channel. | |
1120 | */ | |
1121 | static | |
b53d4e59 | 1122 | struct ust_app_channel *alloc_ust_app_channel(const char *name, |
d0b96690 | 1123 | struct ust_app_session *ua_sess, |
ffe60014 | 1124 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1125 | { |
1126 | struct ust_app_channel *ua_chan; | |
1127 | ||
1128 | /* Init most of the default value by allocating and zeroing */ | |
1129 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1130 | if (ua_chan == NULL) { | |
1131 | PERROR("malloc"); | |
1132 | goto error; | |
1133 | } | |
1134 | ||
1135 | /* Setup channel name */ | |
1136 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1137 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1138 | ||
1139 | ua_chan->enabled = 1; | |
1140 | ua_chan->handle = -1; | |
45893984 | 1141 | ua_chan->session = ua_sess; |
ffe60014 | 1142 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1143 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1144 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1145 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1146 | |
1147 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1148 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1149 | |
1150 | /* Copy attributes */ | |
1151 | if (attr) { | |
ffe60014 | 1152 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1153 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1154 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1155 | ua_chan->attr.overwrite = attr->overwrite; | |
1156 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1157 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1158 | ua_chan->attr.output = attr->output; | |
491d1539 | 1159 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1160 | } |
ffe60014 DG |
1161 | /* By default, the channel is a per cpu channel. */ |
1162 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1163 | |
1164 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1165 | ||
1166 | return ua_chan; | |
1167 | ||
1168 | error: | |
1169 | return NULL; | |
1170 | } | |
1171 | ||
37f1c236 DG |
1172 | /* |
1173 | * Allocate and initialize a UST app stream. | |
1174 | * | |
1175 | * Return newly allocated stream pointer or NULL on error. | |
1176 | */ | |
ffe60014 | 1177 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1178 | { |
1179 | struct ust_app_stream *stream = NULL; | |
1180 | ||
1181 | stream = zmalloc(sizeof(*stream)); | |
1182 | if (stream == NULL) { | |
1183 | PERROR("zmalloc ust app stream"); | |
1184 | goto error; | |
1185 | } | |
1186 | ||
1187 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1188 | stream->handle = -1; | |
1189 | ||
1190 | error: | |
1191 | return stream; | |
1192 | } | |
1193 | ||
8b366481 DG |
1194 | /* |
1195 | * Alloc new UST app event. | |
1196 | */ | |
1197 | static | |
1198 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1199 | struct lttng_ust_event *attr) | |
1200 | { | |
1201 | struct ust_app_event *ua_event; | |
1202 | ||
1203 | /* Init most of the default value by allocating and zeroing */ | |
1204 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1205 | if (ua_event == NULL) { | |
20533947 | 1206 | PERROR("Failed to allocate ust_app_event structure"); |
8b366481 DG |
1207 | goto error; |
1208 | } | |
1209 | ||
1210 | ua_event->enabled = 1; | |
1211 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1212 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1213 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1214 | |
1215 | /* Copy attributes */ | |
1216 | if (attr) { | |
1217 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1218 | } | |
1219 | ||
1220 | DBG3("UST app event %s allocated", ua_event->name); | |
1221 | ||
1222 | return ua_event; | |
1223 | ||
1224 | error: | |
1225 | return NULL; | |
1226 | } | |
1227 | ||
993578ff JR |
1228 | /* |
1229 | * Allocate a new UST app event notifier rule. | |
1230 | */ | |
1231 | static struct ust_app_event_notifier_rule *alloc_ust_app_event_notifier_rule( | |
1232 | struct lttng_event_rule *event_rule, uint64_t token) | |
1233 | { | |
1234 | enum lttng_event_rule_generate_exclusions_status | |
1235 | generate_exclusion_status; | |
1236 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
1237 | ||
1238 | ua_event_notifier_rule = zmalloc(sizeof(struct ust_app_event_notifier_rule)); | |
1239 | if (ua_event_notifier_rule == NULL) { | |
1240 | PERROR("Failed to allocate ust_app_event_notifier_rule structure"); | |
1241 | goto error; | |
1242 | } | |
1243 | ||
1244 | ua_event_notifier_rule->enabled = 1; | |
1245 | ua_event_notifier_rule->token = token; | |
1246 | lttng_ht_node_init_u64(&ua_event_notifier_rule->node, token); | |
1247 | ||
1248 | /* Get reference of the event rule. */ | |
1249 | if (!lttng_event_rule_get(event_rule)) { | |
1250 | abort(); | |
1251 | } | |
1252 | ||
1253 | ua_event_notifier_rule->event_rule = event_rule; | |
1254 | ua_event_notifier_rule->filter = lttng_event_rule_get_filter_bytecode(event_rule); | |
1255 | generate_exclusion_status = lttng_event_rule_generate_exclusions( | |
1256 | event_rule, &ua_event_notifier_rule->exclusion); | |
1257 | switch (generate_exclusion_status) { | |
1258 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_OK: | |
1259 | case LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE: | |
1260 | break; | |
1261 | default: | |
1262 | /* Error occured. */ | |
1263 | ERR("Failed to generate exclusions from event rule while allocating an event notifier rule"); | |
1264 | goto error_put_event_rule; | |
1265 | } | |
1266 | ||
1267 | DBG3("UST app event notifier rule allocated: token = %" PRIu64, | |
1268 | ua_event_notifier_rule->token); | |
1269 | ||
1270 | return ua_event_notifier_rule; | |
1271 | ||
1272 | error_put_event_rule: | |
1273 | lttng_event_rule_put(event_rule); | |
1274 | error: | |
1275 | free(ua_event_notifier_rule); | |
1276 | return NULL; | |
1277 | } | |
1278 | ||
8b366481 DG |
1279 | /* |
1280 | * Alloc new UST app context. | |
1281 | */ | |
1282 | static | |
bdf64013 | 1283 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1284 | { |
1285 | struct ust_app_ctx *ua_ctx; | |
1286 | ||
1287 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1288 | if (ua_ctx == NULL) { | |
1289 | goto error; | |
1290 | } | |
1291 | ||
31746f93 DG |
1292 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1293 | ||
8b366481 DG |
1294 | if (uctx) { |
1295 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 | 1296 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
f3db82be | 1297 | char *provider_name = NULL, *ctx_name = NULL; |
bdf64013 JG |
1298 | |
1299 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1300 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1301 | if (!provider_name || !ctx_name) { | |
1302 | free(provider_name); | |
1303 | free(ctx_name); | |
1304 | goto error; | |
1305 | } | |
1306 | ||
1307 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1308 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1309 | } | |
8b366481 DG |
1310 | } |
1311 | ||
1312 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1313 | return ua_ctx; |
bdf64013 JG |
1314 | error: |
1315 | free(ua_ctx); | |
1316 | return NULL; | |
8b366481 DG |
1317 | } |
1318 | ||
025faf73 DG |
1319 | /* |
1320 | * Allocate a filter and copy the given original filter. | |
1321 | * | |
1322 | * Return allocated filter or NULL on error. | |
1323 | */ | |
51755dc8 JG |
1324 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1325 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1326 | { |
51755dc8 | 1327 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1328 | |
1329 | /* Copy filter bytecode */ | |
1330 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1331 | if (!filter) { | |
51755dc8 | 1332 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1333 | goto error; |
1334 | } | |
1335 | ||
1336 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1337 | ||
1338 | error: | |
1339 | return filter; | |
1340 | } | |
1341 | ||
51755dc8 JG |
1342 | /* |
1343 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1344 | * | |
1345 | * Return allocated filter or NULL on error. | |
1346 | */ | |
1347 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
a154c7b8 | 1348 | const struct lttng_filter_bytecode *orig_f) |
51755dc8 JG |
1349 | { |
1350 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1351 | ||
1352 | /* Copy filter bytecode */ | |
1353 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1354 | if (!filter) { | |
1355 | PERROR("zmalloc alloc ust filter bytecode"); | |
1356 | goto error; | |
1357 | } | |
1358 | ||
1359 | assert(sizeof(struct lttng_filter_bytecode) == | |
1360 | sizeof(struct lttng_ust_filter_bytecode)); | |
1361 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1362 | error: | |
1363 | return filter; | |
1364 | } | |
1365 | ||
099e26bd | 1366 | /* |
421cb601 DG |
1367 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1368 | * held before calling this helper function. | |
099e26bd | 1369 | */ |
f20baf8e | 1370 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1371 | { |
bec39940 | 1372 | struct lttng_ht_node_ulong *node; |
bec39940 | 1373 | struct lttng_ht_iter iter; |
f6a9efaa | 1374 | |
852d0037 | 1375 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1376 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1377 | if (node == NULL) { |
1378 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1379 | goto error; |
1380 | } | |
852d0037 DG |
1381 | |
1382 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1383 | |
1384 | error: | |
1385 | return NULL; | |
099e26bd DG |
1386 | } |
1387 | ||
d0b96690 DG |
1388 | /* |
1389 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1390 | * be held before calling this helper function. | |
1391 | */ | |
1392 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1393 | { | |
1394 | struct lttng_ht_node_ulong *node; | |
1395 | struct lttng_ht_iter iter; | |
1396 | ||
1397 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1398 | &iter); | |
1399 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1400 | if (node == NULL) { | |
1401 | DBG2("UST app find by notify sock %d not found", sock); | |
1402 | goto error; | |
1403 | } | |
1404 | ||
1405 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1406 | ||
1407 | error: | |
1408 | return NULL; | |
1409 | } | |
1410 | ||
025faf73 DG |
1411 | /* |
1412 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1413 | * event loglevel. | |
1414 | * | |
1415 | * Return an ust_app_event object or NULL on error. | |
1416 | */ | |
18eace3b | 1417 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1418 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1419 | int loglevel_value, |
39c5a3a7 | 1420 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1421 | { |
1422 | struct lttng_ht_iter iter; | |
1423 | struct lttng_ht_node_str *node; | |
1424 | struct ust_app_event *event = NULL; | |
1425 | struct ust_app_ht_key key; | |
18eace3b DG |
1426 | |
1427 | assert(name); | |
1428 | assert(ht); | |
1429 | ||
1430 | /* Setup key for event lookup. */ | |
1431 | key.name = name; | |
1432 | key.filter = filter; | |
2106efa0 | 1433 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1434 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1435 | key.exclusion = exclusion; |
18eace3b | 1436 | |
025faf73 DG |
1437 | /* Lookup using the event name as hash and a custom match fct. */ |
1438 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1439 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1440 | node = lttng_ht_iter_get_node_str(&iter); |
1441 | if (node == NULL) { | |
1442 | goto end; | |
1443 | } | |
1444 | ||
1445 | event = caa_container_of(node, struct ust_app_event, node); | |
1446 | ||
1447 | end: | |
18eace3b DG |
1448 | return event; |
1449 | } | |
1450 | ||
993578ff JR |
1451 | /* |
1452 | * Look-up an event notifier rule based on its token id. | |
1453 | * | |
1454 | * Must be called with the RCU read lock held. | |
1455 | * Return an ust_app_event_notifier_rule object or NULL on error. | |
1456 | */ | |
1457 | static struct ust_app_event_notifier_rule *find_ust_app_event_notifier_rule( | |
1458 | struct lttng_ht *ht, uint64_t token) | |
1459 | { | |
1460 | struct lttng_ht_iter iter; | |
1461 | struct lttng_ht_node_u64 *node; | |
1462 | struct ust_app_event_notifier_rule *event_notifier_rule = NULL; | |
1463 | ||
1464 | assert(ht); | |
1465 | ||
1466 | lttng_ht_lookup(ht, &token, &iter); | |
1467 | node = lttng_ht_iter_get_node_u64(&iter); | |
1468 | if (node == NULL) { | |
1469 | DBG2("UST app event notifier rule token not found: token = %" PRIu64, | |
1470 | token); | |
1471 | goto end; | |
1472 | } | |
1473 | ||
1474 | event_notifier_rule = caa_container_of( | |
1475 | node, struct ust_app_event_notifier_rule, node); | |
1476 | end: | |
1477 | return event_notifier_rule; | |
1478 | } | |
1479 | ||
55cc08a6 DG |
1480 | /* |
1481 | * Create the channel context on the tracer. | |
d0b96690 DG |
1482 | * |
1483 | * Called with UST app session lock held. | |
55cc08a6 DG |
1484 | */ |
1485 | static | |
1486 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1487 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1488 | { | |
1489 | int ret; | |
1490 | ||
840cb59c | 1491 | health_code_update(); |
86acf0da | 1492 | |
fb45065e | 1493 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1494 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1495 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1496 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1497 | if (ret < 0) { |
ffe60014 DG |
1498 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1499 | ERR("UST app create channel context failed for app (pid: %d) " | |
1500 | "with ret %d", app->pid, ret); | |
1501 | } else { | |
3757b385 DG |
1502 | /* |
1503 | * This is normal behavior, an application can die during the | |
1504 | * creation process. Don't report an error so the execution can | |
1505 | * continue normally. | |
1506 | */ | |
1507 | ret = 0; | |
88e3c2f5 | 1508 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1509 | } |
55cc08a6 DG |
1510 | goto error; |
1511 | } | |
1512 | ||
1513 | ua_ctx->handle = ua_ctx->obj->handle; | |
1514 | ||
d0b96690 DG |
1515 | DBG2("UST app context handle %d created successfully for channel %s", |
1516 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1517 | |
1518 | error: | |
840cb59c | 1519 | health_code_update(); |
55cc08a6 DG |
1520 | return ret; |
1521 | } | |
1522 | ||
53a80697 MD |
1523 | /* |
1524 | * Set the filter on the tracer. | |
1525 | */ | |
a154c7b8 JR |
1526 | static int set_ust_object_filter(struct ust_app *app, |
1527 | const struct lttng_filter_bytecode *bytecode, | |
1528 | struct lttng_ust_object_data *ust_object) | |
53a80697 MD |
1529 | { |
1530 | int ret; | |
51755dc8 | 1531 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1532 | |
840cb59c | 1533 | health_code_update(); |
86acf0da | 1534 | |
a154c7b8 | 1535 | ust_bytecode = create_ust_bytecode_from_bytecode(bytecode); |
51755dc8 JG |
1536 | if (!ust_bytecode) { |
1537 | ret = -LTTNG_ERR_NOMEM; | |
1538 | goto error; | |
1539 | } | |
fb45065e | 1540 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1541 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
a154c7b8 | 1542 | ust_object); |
fb45065e | 1543 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1544 | if (ret < 0) { |
ffe60014 | 1545 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
a154c7b8 JR |
1546 | ERR("UST app set object filter failed for object %p of app (pid: %d) " |
1547 | "with ret %d", ust_object, app->pid, ret); | |
ffe60014 | 1548 | } else { |
3757b385 DG |
1549 | /* |
1550 | * This is normal behavior, an application can die during the | |
1551 | * creation process. Don't report an error so the execution can | |
1552 | * continue normally. | |
1553 | */ | |
1554 | ret = 0; | |
a154c7b8 | 1555 | DBG3("Failed to set UST app object filter. Application is dead."); |
ffe60014 | 1556 | } |
53a80697 MD |
1557 | goto error; |
1558 | } | |
1559 | ||
a154c7b8 | 1560 | DBG2("UST filter successfully set for object %p", ust_object); |
53a80697 MD |
1561 | |
1562 | error: | |
840cb59c | 1563 | health_code_update(); |
51755dc8 | 1564 | free(ust_bytecode); |
53a80697 MD |
1565 | return ret; |
1566 | } | |
1567 | ||
51755dc8 JG |
1568 | static |
1569 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
c0901ffa | 1570 | const struct lttng_event_exclusion *exclusion) |
51755dc8 JG |
1571 | { |
1572 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1573 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1574 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1575 | ||
1576 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1577 | if (!ust_exclusion) { | |
1578 | PERROR("malloc"); | |
1579 | goto end; | |
1580 | } | |
1581 | ||
1582 | assert(sizeof(struct lttng_event_exclusion) == | |
1583 | sizeof(struct lttng_ust_event_exclusion)); | |
1584 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1585 | end: | |
1586 | return ust_exclusion; | |
1587 | } | |
1588 | ||
7cc9a73c JI |
1589 | /* |
1590 | * Set event exclusions on the tracer. | |
1591 | */ | |
c0901ffa JR |
1592 | static int set_ust_object_exclusions(struct ust_app *app, |
1593 | const struct lttng_event_exclusion *exclusions, | |
1594 | struct lttng_ust_object_data *ust_object) | |
7cc9a73c JI |
1595 | { |
1596 | int ret; | |
c0901ffa | 1597 | struct lttng_ust_event_exclusion *ust_exclusions = NULL; |
7cc9a73c | 1598 | |
c0901ffa | 1599 | assert(exclusions && exclusions->count > 0); |
7cc9a73c | 1600 | |
c0901ffa | 1601 | health_code_update(); |
7cc9a73c | 1602 | |
c0901ffa JR |
1603 | ust_exclusions = create_ust_exclusion_from_exclusion( |
1604 | exclusions); | |
1605 | if (!ust_exclusions) { | |
51755dc8 JG |
1606 | ret = -LTTNG_ERR_NOMEM; |
1607 | goto error; | |
1608 | } | |
fb45065e | 1609 | pthread_mutex_lock(&app->sock_lock); |
c0901ffa | 1610 | ret = ustctl_set_exclusion(app->sock, ust_exclusions, ust_object); |
fb45065e | 1611 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1612 | if (ret < 0) { |
1613 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
c0901ffa JR |
1614 | ERR("Failed to set UST app exclusions for object %p of app (pid: %d) " |
1615 | "with ret %d", ust_object, app->pid, ret); | |
7cc9a73c JI |
1616 | } else { |
1617 | /* | |
1618 | * This is normal behavior, an application can die during the | |
1619 | * creation process. Don't report an error so the execution can | |
1620 | * continue normally. | |
1621 | */ | |
1622 | ret = 0; | |
c0901ffa | 1623 | DBG3("Failed to set UST app object exclusions. Application is dead."); |
7cc9a73c JI |
1624 | } |
1625 | goto error; | |
1626 | } | |
1627 | ||
c0901ffa | 1628 | DBG2("UST exclusions set successfully for object %p", ust_object); |
7cc9a73c JI |
1629 | |
1630 | error: | |
1631 | health_code_update(); | |
c0901ffa | 1632 | free(ust_exclusions); |
7cc9a73c JI |
1633 | return ret; |
1634 | } | |
1635 | ||
9730260e DG |
1636 | /* |
1637 | * Disable the specified event on to UST tracer for the UST session. | |
1638 | */ | |
e2456d0a JR |
1639 | static int disable_ust_object(struct ust_app *app, |
1640 | struct lttng_ust_object_data *object) | |
9730260e DG |
1641 | { |
1642 | int ret; | |
1643 | ||
840cb59c | 1644 | health_code_update(); |
86acf0da | 1645 | |
fb45065e | 1646 | pthread_mutex_lock(&app->sock_lock); |
e2456d0a | 1647 | ret = ustctl_disable(app->sock, object); |
fb45065e | 1648 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1649 | if (ret < 0) { |
ffe60014 | 1650 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
e2456d0a JR |
1651 | ERR("Failed to disable UST app object %p app (pid: %d) with ret %d", |
1652 | object, app->pid, ret); | |
ffe60014 | 1653 | } else { |
3757b385 DG |
1654 | /* |
1655 | * This is normal behavior, an application can die during the | |
1656 | * creation process. Don't report an error so the execution can | |
1657 | * continue normally. | |
1658 | */ | |
1659 | ret = 0; | |
e2456d0a | 1660 | DBG3("Failed to disable UST app object. Application is dead."); |
ffe60014 | 1661 | } |
9730260e DG |
1662 | goto error; |
1663 | } | |
1664 | ||
e2456d0a JR |
1665 | DBG2("UST app object %p disabled successfully for app (pid: %d)", |
1666 | object, app->pid); | |
9730260e DG |
1667 | |
1668 | error: | |
840cb59c | 1669 | health_code_update(); |
9730260e DG |
1670 | return ret; |
1671 | } | |
1672 | ||
78f0bacd DG |
1673 | /* |
1674 | * Disable the specified channel on to UST tracer for the UST session. | |
1675 | */ | |
1676 | static int disable_ust_channel(struct ust_app *app, | |
1677 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1678 | { | |
1679 | int ret; | |
1680 | ||
840cb59c | 1681 | health_code_update(); |
86acf0da | 1682 | |
fb45065e | 1683 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1684 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1685 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1686 | if (ret < 0) { |
ffe60014 DG |
1687 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1688 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1689 | "and session handle %d with ret %d", | |
1690 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1691 | } else { | |
3757b385 DG |
1692 | /* |
1693 | * This is normal behavior, an application can die during the | |
1694 | * creation process. Don't report an error so the execution can | |
1695 | * continue normally. | |
1696 | */ | |
1697 | ret = 0; | |
ffe60014 DG |
1698 | DBG3("UST app disable channel failed. Application is dead."); |
1699 | } | |
78f0bacd DG |
1700 | goto error; |
1701 | } | |
1702 | ||
78f0bacd | 1703 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1704 | ua_chan->name, app->pid); |
78f0bacd DG |
1705 | |
1706 | error: | |
840cb59c | 1707 | health_code_update(); |
78f0bacd DG |
1708 | return ret; |
1709 | } | |
1710 | ||
1711 | /* | |
1712 | * Enable the specified channel on to UST tracer for the UST session. | |
1713 | */ | |
1714 | static int enable_ust_channel(struct ust_app *app, | |
1715 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1716 | { | |
1717 | int ret; | |
1718 | ||
840cb59c | 1719 | health_code_update(); |
86acf0da | 1720 | |
fb45065e | 1721 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1722 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1723 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1724 | if (ret < 0) { |
ffe60014 DG |
1725 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1726 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1727 | "and session handle %d with ret %d", | |
1728 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1729 | } else { | |
3757b385 DG |
1730 | /* |
1731 | * This is normal behavior, an application can die during the | |
1732 | * creation process. Don't report an error so the execution can | |
1733 | * continue normally. | |
1734 | */ | |
1735 | ret = 0; | |
ffe60014 DG |
1736 | DBG3("UST app enable channel failed. Application is dead."); |
1737 | } | |
78f0bacd DG |
1738 | goto error; |
1739 | } | |
1740 | ||
1741 | ua_chan->enabled = 1; | |
1742 | ||
1743 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1744 | ua_chan->name, app->pid); |
78f0bacd DG |
1745 | |
1746 | error: | |
840cb59c | 1747 | health_code_update(); |
78f0bacd DG |
1748 | return ret; |
1749 | } | |
1750 | ||
edb67388 DG |
1751 | /* |
1752 | * Enable the specified event on to UST tracer for the UST session. | |
1753 | */ | |
3428a1b7 JR |
1754 | static int enable_ust_object( |
1755 | struct ust_app *app, struct lttng_ust_object_data *ust_object) | |
edb67388 DG |
1756 | { |
1757 | int ret; | |
1758 | ||
840cb59c | 1759 | health_code_update(); |
86acf0da | 1760 | |
fb45065e | 1761 | pthread_mutex_lock(&app->sock_lock); |
3428a1b7 | 1762 | ret = ustctl_enable(app->sock, ust_object); |
fb45065e | 1763 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1764 | if (ret < 0) { |
ffe60014 | 1765 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
3428a1b7 JR |
1766 | ERR("UST app enable failed for object %p app (pid: %d) with ret %d", |
1767 | ust_object, app->pid, ret); | |
ffe60014 | 1768 | } else { |
3757b385 DG |
1769 | /* |
1770 | * This is normal behavior, an application can die during the | |
1771 | * creation process. Don't report an error so the execution can | |
1772 | * continue normally. | |
1773 | */ | |
1774 | ret = 0; | |
3428a1b7 | 1775 | DBG3("Failed to enable UST app object. Application is dead."); |
ffe60014 | 1776 | } |
edb67388 DG |
1777 | goto error; |
1778 | } | |
1779 | ||
3428a1b7 JR |
1780 | DBG2("UST app object %p enabled successfully for app (pid: %d)", |
1781 | ust_object, app->pid); | |
edb67388 DG |
1782 | |
1783 | error: | |
840cb59c | 1784 | health_code_update(); |
edb67388 DG |
1785 | return ret; |
1786 | } | |
1787 | ||
099e26bd | 1788 | /* |
7972aab2 | 1789 | * Send channel and stream buffer to application. |
4f3ab6ee | 1790 | * |
ffe60014 | 1791 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1792 | */ |
7972aab2 DG |
1793 | static int send_channel_pid_to_ust(struct ust_app *app, |
1794 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1795 | { |
1796 | int ret; | |
ffe60014 | 1797 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1798 | |
1799 | assert(app); | |
ffe60014 | 1800 | assert(ua_sess); |
4f3ab6ee | 1801 | assert(ua_chan); |
4f3ab6ee | 1802 | |
840cb59c | 1803 | health_code_update(); |
4f3ab6ee | 1804 | |
7972aab2 DG |
1805 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1806 | app->sock); | |
86acf0da | 1807 | |
ffe60014 DG |
1808 | /* Send channel to the application. */ |
1809 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1810 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1811 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1812 | goto error; | |
1813 | } else if (ret < 0) { | |
b551a063 DG |
1814 | goto error; |
1815 | } | |
1816 | ||
d88aee68 DG |
1817 | health_code_update(); |
1818 | ||
ffe60014 DG |
1819 | /* Send all streams to application. */ |
1820 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1821 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1822 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1823 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1824 | goto error; | |
1825 | } else if (ret < 0) { | |
ffe60014 DG |
1826 | goto error; |
1827 | } | |
1828 | /* We don't need the stream anymore once sent to the tracer. */ | |
1829 | cds_list_del(&stream->list); | |
fb45065e | 1830 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1831 | } |
ffe60014 DG |
1832 | /* Flag the channel that it is sent to the application. */ |
1833 | ua_chan->is_sent = 1; | |
ffe60014 | 1834 | |
b551a063 | 1835 | error: |
840cb59c | 1836 | health_code_update(); |
b551a063 DG |
1837 | return ret; |
1838 | } | |
1839 | ||
91d76f53 | 1840 | /* |
5b4a0ec0 | 1841 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1842 | * |
1843 | * Should be called with session mutex held. | |
91d76f53 | 1844 | */ |
edb67388 DG |
1845 | static |
1846 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1847 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1848 | { |
5b4a0ec0 | 1849 | int ret = 0; |
284d8f55 | 1850 | |
840cb59c | 1851 | health_code_update(); |
86acf0da | 1852 | |
5b4a0ec0 | 1853 | /* Create UST event on tracer */ |
fb45065e | 1854 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1855 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1856 | &ua_event->obj); |
fb45065e | 1857 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1858 | if (ret < 0) { |
ffe60014 | 1859 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1860 | abort(); |
ffe60014 DG |
1861 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1862 | ua_event->attr.name, app->pid, ret); | |
1863 | } else { | |
3757b385 DG |
1864 | /* |
1865 | * This is normal behavior, an application can die during the | |
1866 | * creation process. Don't report an error so the execution can | |
1867 | * continue normally. | |
1868 | */ | |
1869 | ret = 0; | |
ffe60014 DG |
1870 | DBG3("UST app create event failed. Application is dead."); |
1871 | } | |
5b4a0ec0 | 1872 | goto error; |
91d76f53 | 1873 | } |
f6a9efaa | 1874 | |
5b4a0ec0 | 1875 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1876 | |
3428a1b7 JR |
1877 | DBG2("UST app event %s created successfully for pid:%d object: %p", |
1878 | ua_event->attr.name, app->pid, ua_event->obj); | |
f6a9efaa | 1879 | |
840cb59c | 1880 | health_code_update(); |
86acf0da | 1881 | |
025faf73 DG |
1882 | /* Set filter if one is present. */ |
1883 | if (ua_event->filter) { | |
a154c7b8 | 1884 | ret = set_ust_object_filter(app, ua_event->filter, ua_event->obj); |
025faf73 DG |
1885 | if (ret < 0) { |
1886 | goto error; | |
1887 | } | |
1888 | } | |
1889 | ||
7cc9a73c JI |
1890 | /* Set exclusions for the event */ |
1891 | if (ua_event->exclusion) { | |
c0901ffa | 1892 | ret = set_ust_object_exclusions(app, ua_event->exclusion, ua_event->obj); |
7cc9a73c JI |
1893 | if (ret < 0) { |
1894 | goto error; | |
1895 | } | |
1896 | } | |
1897 | ||
8535a6d9 | 1898 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1899 | if (ua_event->enabled) { |
1900 | /* | |
1901 | * We now need to explicitly enable the event, since it | |
1902 | * is now disabled at creation. | |
1903 | */ | |
3428a1b7 | 1904 | ret = enable_ust_object(app, ua_event->obj); |
40113787 MD |
1905 | if (ret < 0) { |
1906 | /* | |
1907 | * If we hit an EPERM, something is wrong with our enable call. If | |
1908 | * we get an EEXIST, there is a problem on the tracer side since we | |
1909 | * just created it. | |
1910 | */ | |
1911 | switch (ret) { | |
1912 | case -LTTNG_UST_ERR_PERM: | |
1913 | /* Code flow problem */ | |
1914 | assert(0); | |
1915 | case -LTTNG_UST_ERR_EXIST: | |
1916 | /* It's OK for our use case. */ | |
1917 | ret = 0; | |
1918 | break; | |
1919 | default: | |
1920 | break; | |
1921 | } | |
1922 | goto error; | |
1923 | } | |
8535a6d9 DG |
1924 | } |
1925 | ||
5b4a0ec0 | 1926 | error: |
840cb59c | 1927 | health_code_update(); |
5b4a0ec0 | 1928 | return ret; |
91d76f53 | 1929 | } |
48842b30 | 1930 | |
993578ff JR |
1931 | static int init_ust_event_notifier_from_event_rule( |
1932 | const struct lttng_event_rule *rule, | |
1933 | struct lttng_ust_event_notifier *event_notifier) | |
1934 | { | |
1935 | enum lttng_event_rule_status status; | |
1936 | enum lttng_loglevel_type loglevel_type; | |
1937 | enum lttng_ust_loglevel_type ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1938 | int loglevel = -1, ret = 0; | |
1939 | const char *pattern; | |
1940 | ||
1941 | /* For now only LTTNG_EVENT_RULE_TYPE_TRACEPOINT are supported. */ | |
1942 | assert(lttng_event_rule_get_type(rule) == | |
1943 | LTTNG_EVENT_RULE_TYPE_TRACEPOINT); | |
1944 | ||
1945 | memset(event_notifier, 0, sizeof(*event_notifier)); | |
1946 | ||
1947 | status = lttng_event_rule_tracepoint_get_pattern(rule, &pattern); | |
1948 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
1949 | /* At this point, this is a fatal error. */ | |
1950 | abort(); | |
1951 | } | |
1952 | ||
1953 | status = lttng_event_rule_tracepoint_get_log_level_type( | |
1954 | rule, &loglevel_type); | |
1955 | if (status != LTTNG_EVENT_RULE_STATUS_OK) { | |
1956 | /* At this point, this is a fatal error. */ | |
1957 | abort(); | |
1958 | } | |
1959 | ||
1960 | switch (loglevel_type) { | |
1961 | case LTTNG_EVENT_LOGLEVEL_ALL: | |
1962 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_ALL; | |
1963 | break; | |
1964 | case LTTNG_EVENT_LOGLEVEL_RANGE: | |
1965 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; | |
1966 | break; | |
1967 | case LTTNG_EVENT_LOGLEVEL_SINGLE: | |
1968 | ust_loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; | |
1969 | break; | |
1970 | default: | |
1971 | /* Unknown log level specification type. */ | |
1972 | abort(); | |
1973 | } | |
1974 | ||
1975 | if (loglevel_type != LTTNG_EVENT_LOGLEVEL_ALL) { | |
1976 | status = lttng_event_rule_tracepoint_get_log_level( | |
1977 | rule, &loglevel); | |
1978 | assert(status == LTTNG_EVENT_RULE_STATUS_OK); | |
1979 | } | |
1980 | ||
1981 | event_notifier->event.instrumentation = LTTNG_UST_TRACEPOINT; | |
1982 | ret = lttng_strncpy(event_notifier->event.name, pattern, | |
1983 | LTTNG_UST_SYM_NAME_LEN - 1); | |
1984 | if (ret) { | |
1985 | ERR("Failed to copy event rule pattern to notifier: pattern = '%s' ", | |
1986 | pattern); | |
1987 | goto end; | |
1988 | } | |
1989 | ||
1990 | event_notifier->event.loglevel_type = ust_loglevel_type; | |
1991 | event_notifier->event.loglevel = loglevel; | |
1992 | end: | |
1993 | return ret; | |
1994 | } | |
1995 | ||
1996 | /* | |
1997 | * Create the specified event notifier against the user space tracer of a | |
1998 | * given application. | |
1999 | */ | |
2000 | static int create_ust_event_notifier(struct ust_app *app, | |
2001 | struct ust_app_event_notifier_rule *ua_event_notifier_rule) | |
2002 | { | |
2003 | int ret = 0; | |
2004 | struct lttng_ust_event_notifier event_notifier; | |
2005 | ||
2006 | health_code_update(); | |
2007 | assert(app->event_notifier_group.object); | |
2008 | ||
2009 | ret = init_ust_event_notifier_from_event_rule( | |
2010 | ua_event_notifier_rule->event_rule, &event_notifier); | |
2011 | if (ret) { | |
2012 | ERR("Failed to initialize UST event notifier from event rule: app = '%s' (ppid: %d)", | |
2013 | app->name, app->ppid); | |
2014 | goto error; | |
2015 | } | |
2016 | ||
2017 | event_notifier.event.token = ua_event_notifier_rule->token; | |
2018 | ||
2019 | /* Create UST event notifier against the tracer. */ | |
2020 | pthread_mutex_lock(&app->sock_lock); | |
2021 | ret = ustctl_create_event_notifier(app->sock, &event_notifier, | |
2022 | app->event_notifier_group.object, | |
2023 | &ua_event_notifier_rule->obj); | |
2024 | pthread_mutex_unlock(&app->sock_lock); | |
2025 | if (ret < 0) { | |
2026 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2027 | ERR("Error ustctl create event notifier: name = '%s', app = '%s' (ppid: %d), ret = %d", | |
2028 | event_notifier.event.name, app->name, | |
2029 | app->ppid, ret); | |
2030 | } else { | |
2031 | /* | |
2032 | * This is normal behavior, an application can die | |
2033 | * during the creation process. Don't report an error so | |
2034 | * the execution can continue normally. | |
2035 | */ | |
2036 | ret = 0; | |
2037 | DBG3("UST app create event notifier failed (application is dead): app = '%s' (ppid = %d)", | |
2038 | app->name, app->ppid); | |
2039 | } | |
2040 | ||
2041 | goto error; | |
2042 | } | |
2043 | ||
2044 | ua_event_notifier_rule->handle = ua_event_notifier_rule->obj->handle; | |
2045 | ||
2046 | DBG2("UST app event notifier %s created successfully: app = '%s' (ppid: %d), object: %p", | |
2047 | event_notifier.event.name, app->name, app->ppid, | |
2048 | ua_event_notifier_rule->obj); | |
2049 | ||
2050 | health_code_update(); | |
2051 | ||
2052 | /* Set filter if one is present. */ | |
2053 | if (ua_event_notifier_rule->filter) { | |
2054 | ret = set_ust_object_filter(app, ua_event_notifier_rule->filter, | |
2055 | ua_event_notifier_rule->obj); | |
2056 | if (ret < 0) { | |
2057 | goto error; | |
2058 | } | |
2059 | } | |
2060 | ||
2061 | /* Set exclusions for the event. */ | |
2062 | if (ua_event_notifier_rule->exclusion) { | |
2063 | ret = set_ust_object_exclusions(app, | |
2064 | ua_event_notifier_rule->exclusion, | |
2065 | ua_event_notifier_rule->obj); | |
2066 | if (ret < 0) { | |
2067 | goto error; | |
2068 | } | |
2069 | } | |
2070 | ||
2071 | /* | |
2072 | * We now need to explicitly enable the event, since it | |
2073 | * is disabled at creation. | |
2074 | */ | |
2075 | ret = enable_ust_object(app, ua_event_notifier_rule->obj); | |
2076 | if (ret < 0) { | |
2077 | /* | |
2078 | * If we hit an EPERM, something is wrong with our enable call. | |
2079 | * If we get an EEXIST, there is a problem on the tracer side | |
2080 | * since we just created it. | |
2081 | */ | |
2082 | switch (ret) { | |
2083 | case -LTTNG_UST_ERR_PERM: | |
2084 | /* Code flow problem. */ | |
2085 | abort(); | |
2086 | case -LTTNG_UST_ERR_EXIST: | |
2087 | /* It's OK for our use case. */ | |
2088 | ret = 0; | |
2089 | break; | |
2090 | default: | |
2091 | break; | |
2092 | } | |
2093 | ||
2094 | goto error; | |
2095 | } | |
2096 | ||
2097 | ua_event_notifier_rule->enabled = true; | |
2098 | ||
2099 | error: | |
2100 | health_code_update(); | |
2101 | return ret; | |
2102 | } | |
2103 | ||
5b4a0ec0 DG |
2104 | /* |
2105 | * Copy data between an UST app event and a LTT event. | |
2106 | */ | |
421cb601 | 2107 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
2108 | struct ltt_ust_event *uevent) |
2109 | { | |
b4ffad32 JI |
2110 | size_t exclusion_alloc_size; |
2111 | ||
48842b30 DG |
2112 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
2113 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
2114 | ||
fc34caaa DG |
2115 | ua_event->enabled = uevent->enabled; |
2116 | ||
5b4a0ec0 DG |
2117 | /* Copy event attributes */ |
2118 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
2119 | ||
53a80697 MD |
2120 | /* Copy filter bytecode */ |
2121 | if (uevent->filter) { | |
51755dc8 | 2122 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 2123 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 2124 | } |
b4ffad32 JI |
2125 | |
2126 | /* Copy exclusion data */ | |
2127 | if (uevent->exclusion) { | |
51755dc8 | 2128 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
2129 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
2130 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
2131 | if (ua_event->exclusion == NULL) { |
2132 | PERROR("malloc"); | |
2133 | } else { | |
2134 | memcpy(ua_event->exclusion, uevent->exclusion, | |
2135 | exclusion_alloc_size); | |
b4ffad32 JI |
2136 | } |
2137 | } | |
48842b30 DG |
2138 | } |
2139 | ||
5b4a0ec0 DG |
2140 | /* |
2141 | * Copy data between an UST app channel and a LTT channel. | |
2142 | */ | |
421cb601 | 2143 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
2144 | struct ltt_ust_channel *uchan) |
2145 | { | |
fc34caaa | 2146 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
2147 | |
2148 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
2149 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 2150 | |
1624d5b7 JD |
2151 | ua_chan->tracefile_size = uchan->tracefile_size; |
2152 | ua_chan->tracefile_count = uchan->tracefile_count; | |
2153 | ||
ffe60014 DG |
2154 | /* Copy event attributes since the layout is different. */ |
2155 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
2156 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
2157 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
2158 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
2159 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 2160 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 2161 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
2162 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
2163 | ||
ffe60014 DG |
2164 | /* |
2165 | * Note that the attribute channel type is not set since the channel on the | |
2166 | * tracing registry side does not have this information. | |
2167 | */ | |
48842b30 | 2168 | |
fc34caaa | 2169 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 2170 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 2171 | |
fc34caaa | 2172 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
2173 | } |
2174 | ||
5b4a0ec0 DG |
2175 | /* |
2176 | * Copy data between a UST app session and a regular LTT session. | |
2177 | */ | |
421cb601 | 2178 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 2179 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2180 | { |
477d7741 MD |
2181 | struct tm *timeinfo; |
2182 | char datetime[16]; | |
2183 | int ret; | |
d7ba1388 | 2184 | char tmp_shm_path[PATH_MAX]; |
477d7741 | 2185 | |
940c4592 | 2186 | timeinfo = localtime(&app->registration_time); |
477d7741 | 2187 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
48842b30 | 2188 | |
421cb601 | 2189 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 2190 | |
7972aab2 DG |
2191 | ua_sess->tracing_id = usess->id; |
2192 | ua_sess->id = get_next_session_id(); | |
ff588497 JR |
2193 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.uid, app->uid); |
2194 | LTTNG_OPTIONAL_SET(&ua_sess->real_credentials.gid, app->gid); | |
2195 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.uid, usess->uid); | |
2196 | LTTNG_OPTIONAL_SET(&ua_sess->effective_credentials.gid, usess->gid); | |
7972aab2 DG |
2197 | ua_sess->buffer_type = usess->buffer_type; |
2198 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 2199 | |
7972aab2 | 2200 | /* There is only one consumer object per session possible. */ |
6addfa37 | 2201 | consumer_output_get(usess->consumer); |
7972aab2 | 2202 | ua_sess->consumer = usess->consumer; |
6addfa37 | 2203 | |
2bba9e53 | 2204 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 2205 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
2206 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
2207 | &usess->metadata_attr); | |
7972aab2 DG |
2208 | |
2209 | switch (ua_sess->buffer_type) { | |
2210 | case LTTNG_BUFFER_PER_PID: | |
2211 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 2212 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
2213 | datetime); |
2214 | break; | |
2215 | case LTTNG_BUFFER_PER_UID: | |
2216 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 | 2217 | DEFAULT_UST_TRACE_UID_PATH, |
ff588497 | 2218 | lttng_credentials_get_uid(&ua_sess->real_credentials), |
470cc211 | 2219 | app->bits_per_long); |
7972aab2 DG |
2220 | break; |
2221 | default: | |
2222 | assert(0); | |
2223 | goto error; | |
2224 | } | |
477d7741 MD |
2225 | if (ret < 0) { |
2226 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 2227 | assert(0); |
7972aab2 | 2228 | goto error; |
477d7741 MD |
2229 | } |
2230 | ||
3d071855 MD |
2231 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
2232 | sizeof(ua_sess->root_shm_path)); | |
2233 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
2234 | strncpy(ua_sess->shm_path, usess->shm_path, |
2235 | sizeof(ua_sess->shm_path)); | |
2236 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2237 | if (ua_sess->shm_path[0]) { | |
2238 | switch (ua_sess->buffer_type) { | |
2239 | case LTTNG_BUFFER_PER_PID: | |
2240 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2241 | "/" DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", |
d7ba1388 MD |
2242 | app->name, app->pid, datetime); |
2243 | break; | |
2244 | case LTTNG_BUFFER_PER_UID: | |
2245 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
5da88b0f | 2246 | "/" DEFAULT_UST_TRACE_UID_PATH, |
d7ba1388 MD |
2247 | app->uid, app->bits_per_long); |
2248 | break; | |
2249 | default: | |
2250 | assert(0); | |
2251 | goto error; | |
2252 | } | |
2253 | if (ret < 0) { | |
2254 | PERROR("sprintf UST shadow copy session"); | |
2255 | assert(0); | |
2256 | goto error; | |
2257 | } | |
2258 | strncat(ua_sess->shm_path, tmp_shm_path, | |
2259 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
2260 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
2261 | } | |
6addfa37 | 2262 | return; |
7972aab2 DG |
2263 | |
2264 | error: | |
6addfa37 | 2265 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
2266 | } |
2267 | ||
78f0bacd DG |
2268 | /* |
2269 | * Lookup sesison wrapper. | |
2270 | */ | |
84cd17c6 | 2271 | static |
fb9a95c4 | 2272 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 2273 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
2274 | { |
2275 | /* Get right UST app session from app */ | |
d9bf3ca4 | 2276 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
2277 | } |
2278 | ||
421cb601 DG |
2279 | /* |
2280 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 2281 | * id. |
421cb601 | 2282 | */ |
48842b30 | 2283 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 2284 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 2285 | { |
bec39940 | 2286 | struct lttng_ht_iter iter; |
d9bf3ca4 | 2287 | struct lttng_ht_node_u64 *node; |
48842b30 | 2288 | |
84cd17c6 | 2289 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 2290 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
2291 | if (node == NULL) { |
2292 | goto error; | |
2293 | } | |
2294 | ||
2295 | return caa_container_of(node, struct ust_app_session, node); | |
2296 | ||
2297 | error: | |
2298 | return NULL; | |
2299 | } | |
2300 | ||
7972aab2 DG |
2301 | /* |
2302 | * Setup buffer registry per PID for the given session and application. If none | |
2303 | * is found, a new one is created, added to the global registry and | |
2304 | * initialized. If regp is valid, it's set with the newly created object. | |
2305 | * | |
2306 | * Return 0 on success or else a negative value. | |
2307 | */ | |
2308 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2309 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2310 | { | |
2311 | int ret = 0; | |
2312 | struct buffer_reg_pid *reg_pid; | |
2313 | ||
2314 | assert(ua_sess); | |
2315 | assert(app); | |
2316 | ||
2317 | rcu_read_lock(); | |
2318 | ||
2319 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2320 | if (!reg_pid) { | |
2321 | /* | |
2322 | * This is the create channel path meaning that if there is NO | |
2323 | * registry available, we have to create one for this session. | |
2324 | */ | |
d7ba1388 | 2325 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2326 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2327 | if (ret < 0) { |
2328 | goto error; | |
2329 | } | |
7972aab2 DG |
2330 | } else { |
2331 | goto end; | |
2332 | } | |
2333 | ||
2334 | /* Initialize registry. */ | |
2335 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2336 | app->bits_per_long, app->uint8_t_alignment, | |
2337 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 2338 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
2339 | app->byte_order, app->version.major, app->version.minor, |
2340 | reg_pid->root_shm_path, reg_pid->shm_path, | |
ff588497 JR |
2341 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
2342 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
2343 | ua_sess->tracing_id, | |
8de88061 | 2344 | app->uid); |
7972aab2 | 2345 | if (ret < 0) { |
286c991a MD |
2346 | /* |
2347 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2348 | * destroy the buffer registry, because it is always expected | |
2349 | * that if the buffer registry can be found, its ust registry is | |
2350 | * non-NULL. | |
2351 | */ | |
2352 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2353 | goto error; |
2354 | } | |
2355 | ||
286c991a MD |
2356 | buffer_reg_pid_add(reg_pid); |
2357 | ||
7972aab2 DG |
2358 | DBG3("UST app buffer registry per PID created successfully"); |
2359 | ||
2360 | end: | |
2361 | if (regp) { | |
2362 | *regp = reg_pid; | |
2363 | } | |
2364 | error: | |
2365 | rcu_read_unlock(); | |
2366 | return ret; | |
2367 | } | |
2368 | ||
2369 | /* | |
2370 | * Setup buffer registry per UID for the given session and application. If none | |
2371 | * is found, a new one is created, added to the global registry and | |
2372 | * initialized. If regp is valid, it's set with the newly created object. | |
2373 | * | |
2374 | * Return 0 on success or else a negative value. | |
2375 | */ | |
2376 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2377 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2378 | struct ust_app *app, struct buffer_reg_uid **regp) |
2379 | { | |
2380 | int ret = 0; | |
2381 | struct buffer_reg_uid *reg_uid; | |
2382 | ||
2383 | assert(usess); | |
2384 | assert(app); | |
2385 | ||
2386 | rcu_read_lock(); | |
2387 | ||
2388 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2389 | if (!reg_uid) { | |
2390 | /* | |
2391 | * This is the create channel path meaning that if there is NO | |
2392 | * registry available, we have to create one for this session. | |
2393 | */ | |
2394 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2395 | LTTNG_DOMAIN_UST, ®_uid, |
2396 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2397 | if (ret < 0) { |
2398 | goto error; | |
2399 | } | |
7972aab2 DG |
2400 | } else { |
2401 | goto end; | |
2402 | } | |
2403 | ||
2404 | /* Initialize registry. */ | |
af6142cf | 2405 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2406 | app->bits_per_long, app->uint8_t_alignment, |
2407 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2408 | app->uint64_t_alignment, app->long_alignment, |
2409 | app->byte_order, app->version.major, | |
3d071855 | 2410 | app->version.minor, reg_uid->root_shm_path, |
8de88061 JR |
2411 | reg_uid->shm_path, usess->uid, usess->gid, |
2412 | ua_sess->tracing_id, app->uid); | |
7972aab2 | 2413 | if (ret < 0) { |
286c991a MD |
2414 | /* |
2415 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2416 | * destroy the buffer registry, because it is always expected | |
2417 | * that if the buffer registry can be found, its ust registry is | |
2418 | * non-NULL. | |
2419 | */ | |
2420 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2421 | goto error; |
2422 | } | |
2423 | /* Add node to teardown list of the session. */ | |
2424 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2425 | ||
286c991a | 2426 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2427 | |
286c991a | 2428 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2429 | end: |
2430 | if (regp) { | |
2431 | *regp = reg_uid; | |
2432 | } | |
2433 | error: | |
2434 | rcu_read_unlock(); | |
2435 | return ret; | |
2436 | } | |
2437 | ||
421cb601 | 2438 | /* |
3d8ca23b | 2439 | * Create a session on the tracer side for the given app. |
421cb601 | 2440 | * |
3d8ca23b DG |
2441 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2442 | * untouched. If the session was created, is_created is set to 1. On error, | |
2443 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2444 | * be NULL. | |
2445 | * | |
2446 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2447 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2448 | */ |
03f91eaa | 2449 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2450 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2451 | int *is_created) | |
421cb601 | 2452 | { |
3d8ca23b | 2453 | int ret, created = 0; |
421cb601 DG |
2454 | struct ust_app_session *ua_sess; |
2455 | ||
3d8ca23b DG |
2456 | assert(usess); |
2457 | assert(app); | |
2458 | assert(ua_sess_ptr); | |
2459 | ||
840cb59c | 2460 | health_code_update(); |
86acf0da | 2461 | |
421cb601 DG |
2462 | ua_sess = lookup_session_by_app(usess, app); |
2463 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2464 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2465 | app->pid, usess->id); |
40bbd087 | 2466 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2467 | if (ua_sess == NULL) { |
2468 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2469 | ret = -ENOMEM; |
2470 | goto error; | |
421cb601 | 2471 | } |
477d7741 | 2472 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2473 | created = 1; |
421cb601 DG |
2474 | } |
2475 | ||
7972aab2 DG |
2476 | switch (usess->buffer_type) { |
2477 | case LTTNG_BUFFER_PER_PID: | |
2478 | /* Init local registry. */ | |
2479 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2480 | if (ret < 0) { |
e64207cf | 2481 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2482 | goto error; |
2483 | } | |
2484 | break; | |
2485 | case LTTNG_BUFFER_PER_UID: | |
2486 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2487 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2488 | if (ret < 0) { |
e64207cf | 2489 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2490 | goto error; |
2491 | } | |
2492 | break; | |
2493 | default: | |
2494 | assert(0); | |
2495 | ret = -EINVAL; | |
2496 | goto error; | |
2497 | } | |
2498 | ||
2499 | health_code_update(); | |
2500 | ||
2501 | if (ua_sess->handle == -1) { | |
fb45065e | 2502 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2503 | ret = ustctl_create_session(app->sock); |
fb45065e | 2504 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2505 | if (ret < 0) { |
2506 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2507 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2508 | app->pid, ret); |
2509 | } else { | |
2510 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2511 | /* |
2512 | * This is normal behavior, an application can die during the | |
2513 | * creation process. Don't report an error so the execution can | |
2514 | * continue normally. This will get flagged ENOTCONN and the | |
2515 | * caller will handle it. | |
2516 | */ | |
2517 | ret = 0; | |
ffe60014 | 2518 | } |
d0b96690 | 2519 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2520 | if (ret != -ENOMEM) { |
2521 | /* | |
2522 | * Tracer is probably gone or got an internal error so let's | |
2523 | * behave like it will soon unregister or not usable. | |
2524 | */ | |
2525 | ret = -ENOTCONN; | |
2526 | } | |
2527 | goto error; | |
421cb601 DG |
2528 | } |
2529 | ||
7972aab2 DG |
2530 | ua_sess->handle = ret; |
2531 | ||
2532 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2533 | lttng_ht_node_init_u64(&ua_sess->node, |
2534 | ua_sess->tracing_id); | |
2535 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2536 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2537 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2538 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2539 | |
2540 | DBG2("UST app session created successfully with handle %d", ret); | |
2541 | } | |
2542 | ||
2543 | *ua_sess_ptr = ua_sess; | |
2544 | if (is_created) { | |
2545 | *is_created = created; | |
2546 | } | |
2547 | ||
2548 | /* Everything went well. */ | |
2549 | ret = 0; | |
2550 | ||
2551 | error: | |
2552 | health_code_update(); | |
2553 | return ret; | |
2554 | } | |
2555 | ||
6a6b2068 JG |
2556 | /* |
2557 | * Match function for a hash table lookup of ust_app_ctx. | |
2558 | * | |
2559 | * It matches an ust app context based on the context type and, in the case | |
2560 | * of perf counters, their name. | |
2561 | */ | |
2562 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2563 | { | |
2564 | struct ust_app_ctx *ctx; | |
bdf64013 | 2565 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2566 | |
2567 | assert(node); | |
2568 | assert(_key); | |
2569 | ||
2570 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2571 | key = _key; | |
2572 | ||
2573 | /* Context type */ | |
2574 | if (ctx->ctx.ctx != key->ctx) { | |
2575 | goto no_match; | |
2576 | } | |
2577 | ||
bdf64013 JG |
2578 | switch(key->ctx) { |
2579 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2580 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2581 | ctx->ctx.u.perf_counter.name, |
2582 | sizeof(key->u.perf_counter.name))) { | |
2583 | goto no_match; | |
2584 | } | |
2585 | break; | |
2586 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2587 | if (strcmp(key->u.app_ctx.provider_name, | |
2588 | ctx->ctx.u.app_ctx.provider_name) || | |
2589 | strcmp(key->u.app_ctx.ctx_name, | |
2590 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2591 | goto no_match; |
2592 | } | |
bdf64013 JG |
2593 | break; |
2594 | default: | |
2595 | break; | |
6a6b2068 JG |
2596 | } |
2597 | ||
2598 | /* Match. */ | |
2599 | return 1; | |
2600 | ||
2601 | no_match: | |
2602 | return 0; | |
2603 | } | |
2604 | ||
2605 | /* | |
2606 | * Lookup for an ust app context from an lttng_ust_context. | |
2607 | * | |
be184a0f | 2608 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2609 | * Return an ust_app_ctx object or NULL on error. |
2610 | */ | |
2611 | static | |
2612 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2613 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2614 | { |
2615 | struct lttng_ht_iter iter; | |
2616 | struct lttng_ht_node_ulong *node; | |
2617 | struct ust_app_ctx *app_ctx = NULL; | |
2618 | ||
2619 | assert(uctx); | |
2620 | assert(ht); | |
2621 | ||
2622 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2623 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2624 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2625 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2626 | if (!node) { | |
2627 | goto end; | |
2628 | } | |
2629 | ||
2630 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2631 | ||
2632 | end: | |
2633 | return app_ctx; | |
2634 | } | |
2635 | ||
7972aab2 DG |
2636 | /* |
2637 | * Create a context for the channel on the tracer. | |
2638 | * | |
2639 | * Called with UST app session lock held and a RCU read side lock. | |
2640 | */ | |
2641 | static | |
c9edf082 | 2642 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
f3db82be | 2643 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2644 | struct ust_app *app) |
2645 | { | |
2646 | int ret = 0; | |
7972aab2 DG |
2647 | struct ust_app_ctx *ua_ctx; |
2648 | ||
2649 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2650 | ||
6a6b2068 JG |
2651 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2652 | if (ua_ctx) { | |
7972aab2 DG |
2653 | ret = -EEXIST; |
2654 | goto error; | |
2655 | } | |
2656 | ||
2657 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2658 | if (ua_ctx == NULL) { | |
2659 | /* malloc failed */ | |
7682f304 | 2660 | ret = -ENOMEM; |
7972aab2 DG |
2661 | goto error; |
2662 | } | |
2663 | ||
2664 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2665 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2666 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2667 | |
2668 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2669 | if (ret < 0) { | |
2670 | goto error; | |
2671 | } | |
2672 | ||
2673 | error: | |
2674 | return ret; | |
2675 | } | |
2676 | ||
2677 | /* | |
2678 | * Enable on the tracer side a ust app event for the session and channel. | |
2679 | * | |
2680 | * Called with UST app session lock held. | |
2681 | */ | |
2682 | static | |
2683 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2684 | struct ust_app_event *ua_event, struct ust_app *app) | |
2685 | { | |
2686 | int ret; | |
2687 | ||
3428a1b7 | 2688 | ret = enable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2689 | if (ret < 0) { |
2690 | goto error; | |
2691 | } | |
2692 | ||
2693 | ua_event->enabled = 1; | |
2694 | ||
2695 | error: | |
2696 | return ret; | |
2697 | } | |
2698 | ||
2699 | /* | |
2700 | * Disable on the tracer side a ust app event for the session and channel. | |
2701 | */ | |
2702 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2703 | struct ust_app_event *ua_event, struct ust_app *app) | |
2704 | { | |
2705 | int ret; | |
2706 | ||
e2456d0a | 2707 | ret = disable_ust_object(app, ua_event->obj); |
7972aab2 DG |
2708 | if (ret < 0) { |
2709 | goto error; | |
2710 | } | |
2711 | ||
2712 | ua_event->enabled = 0; | |
2713 | ||
2714 | error: | |
2715 | return ret; | |
2716 | } | |
2717 | ||
2718 | /* | |
2719 | * Lookup ust app channel for session and disable it on the tracer side. | |
2720 | */ | |
2721 | static | |
2722 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2723 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2724 | { | |
2725 | int ret; | |
2726 | ||
2727 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2728 | if (ret < 0) { | |
2729 | goto error; | |
2730 | } | |
2731 | ||
2732 | ua_chan->enabled = 0; | |
2733 | ||
2734 | error: | |
2735 | return ret; | |
2736 | } | |
2737 | ||
2738 | /* | |
2739 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2740 | * MUST be called with a RCU read side lock acquired. | |
2741 | */ | |
2742 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2743 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2744 | { | |
2745 | int ret = 0; | |
2746 | struct lttng_ht_iter iter; | |
2747 | struct lttng_ht_node_str *ua_chan_node; | |
2748 | struct ust_app_channel *ua_chan; | |
2749 | ||
2750 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2751 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2752 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2753 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2754 | uchan->name, ua_sess->tracing_id); |
2755 | goto error; | |
2756 | } | |
2757 | ||
2758 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2759 | ||
2760 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2761 | if (ret < 0) { | |
2762 | goto error; | |
2763 | } | |
2764 | ||
2765 | error: | |
2766 | return ret; | |
2767 | } | |
2768 | ||
2769 | /* | |
2770 | * Ask the consumer to create a channel and get it if successful. | |
2771 | * | |
fad1ed2f JR |
2772 | * Called with UST app session lock held. |
2773 | * | |
7972aab2 DG |
2774 | * Return 0 on success or else a negative value. |
2775 | */ | |
2776 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2777 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2778 | int bitness, struct ust_registry_session *registry, |
2779 | uint64_t trace_archive_id) | |
7972aab2 DG |
2780 | { |
2781 | int ret; | |
2782 | unsigned int nb_fd = 0; | |
2783 | struct consumer_socket *socket; | |
2784 | ||
2785 | assert(usess); | |
2786 | assert(ua_sess); | |
2787 | assert(ua_chan); | |
2788 | assert(registry); | |
2789 | ||
2790 | rcu_read_lock(); | |
2791 | health_code_update(); | |
2792 | ||
2793 | /* Get the right consumer socket for the application. */ | |
2794 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2795 | if (!socket) { | |
2796 | ret = -EINVAL; | |
2797 | goto error; | |
2798 | } | |
2799 | ||
2800 | health_code_update(); | |
2801 | ||
2802 | /* Need one fd for the channel. */ | |
2803 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2804 | if (ret < 0) { | |
2805 | ERR("Exhausted number of available FD upon create channel"); | |
2806 | goto error; | |
2807 | } | |
2808 | ||
2809 | /* | |
2810 | * Ask consumer to create channel. The consumer will return the number of | |
2811 | * stream we have to expect. | |
2812 | */ | |
2813 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2814 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2815 | if (ret < 0) { |
2816 | goto error_ask; | |
2817 | } | |
2818 | ||
2819 | /* | |
2820 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2821 | * stream (2 being the default value here). | |
2822 | */ | |
2823 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2824 | ||
2825 | /* Reserve the amount of file descriptor we need. */ | |
2826 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2827 | if (ret < 0) { | |
2828 | ERR("Exhausted number of available FD upon create channel"); | |
2829 | goto error_fd_get_stream; | |
2830 | } | |
2831 | ||
2832 | health_code_update(); | |
2833 | ||
2834 | /* | |
2835 | * Now get the channel from the consumer. This call wil populate the stream | |
2836 | * list of that channel and set the ust objects. | |
2837 | */ | |
d9078d0c DG |
2838 | if (usess->consumer->enabled) { |
2839 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2840 | if (ret < 0) { | |
2841 | goto error_destroy; | |
2842 | } | |
7972aab2 DG |
2843 | } |
2844 | ||
2845 | rcu_read_unlock(); | |
2846 | return 0; | |
2847 | ||
2848 | error_destroy: | |
2849 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2850 | error_fd_get_stream: | |
2851 | /* | |
2852 | * Initiate a destroy channel on the consumer since we had an error | |
2853 | * handling it on our side. The return value is of no importance since we | |
2854 | * already have a ret value set by the previous error that we need to | |
2855 | * return. | |
2856 | */ | |
2857 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2858 | error_ask: | |
2859 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2860 | error: | |
2861 | health_code_update(); | |
2862 | rcu_read_unlock(); | |
2863 | return ret; | |
2864 | } | |
2865 | ||
2866 | /* | |
2867 | * Duplicate the ust data object of the ust app stream and save it in the | |
2868 | * buffer registry stream. | |
2869 | * | |
2870 | * Return 0 on success or else a negative value. | |
2871 | */ | |
2872 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2873 | struct ust_app_stream *stream) | |
2874 | { | |
2875 | int ret; | |
2876 | ||
2877 | assert(reg_stream); | |
2878 | assert(stream); | |
2879 | ||
2880 | /* Reserve the amount of file descriptor we need. */ | |
2881 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2882 | if (ret < 0) { | |
2883 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2884 | goto error; | |
2885 | } | |
2886 | ||
2887 | /* Duplicate object for stream once the original is in the registry. */ | |
2888 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2889 | reg_stream->obj.ust); | |
2890 | if (ret < 0) { | |
2891 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2892 | reg_stream->obj.ust, stream->obj, ret); | |
2893 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2894 | goto error; | |
2895 | } | |
2896 | stream->handle = stream->obj->handle; | |
2897 | ||
2898 | error: | |
2899 | return ret; | |
2900 | } | |
2901 | ||
2902 | /* | |
2903 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2904 | * buffer registry channel. | |
2905 | * | |
2906 | * Return 0 on success or else a negative value. | |
2907 | */ | |
2908 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2909 | struct ust_app_channel *ua_chan) | |
2910 | { | |
2911 | int ret; | |
2912 | ||
2913 | assert(reg_chan); | |
2914 | assert(ua_chan); | |
2915 | ||
2916 | /* Need two fds for the channel. */ | |
2917 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2918 | if (ret < 0) { | |
2919 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2920 | goto error_fd_get; | |
2921 | } | |
2922 | ||
2923 | /* Duplicate object for stream once the original is in the registry. */ | |
2924 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2925 | if (ret < 0) { | |
2926 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2927 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2928 | goto error; | |
2929 | } | |
2930 | ua_chan->handle = ua_chan->obj->handle; | |
2931 | ||
2932 | return 0; | |
2933 | ||
2934 | error: | |
2935 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2936 | error_fd_get: | |
2937 | return ret; | |
2938 | } | |
2939 | ||
2940 | /* | |
2941 | * For a given channel buffer registry, setup all streams of the given ust | |
2942 | * application channel. | |
2943 | * | |
2944 | * Return 0 on success or else a negative value. | |
2945 | */ | |
2946 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2947 | struct ust_app_channel *ua_chan, |
2948 | struct ust_app *app) | |
7972aab2 DG |
2949 | { |
2950 | int ret = 0; | |
2951 | struct ust_app_stream *stream, *stmp; | |
2952 | ||
2953 | assert(reg_chan); | |
2954 | assert(ua_chan); | |
2955 | ||
2956 | DBG2("UST app setup buffer registry stream"); | |
2957 | ||
2958 | /* Send all streams to application. */ | |
2959 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2960 | struct buffer_reg_stream *reg_stream; | |
2961 | ||
2962 | ret = buffer_reg_stream_create(®_stream); | |
2963 | if (ret < 0) { | |
2964 | goto error; | |
2965 | } | |
2966 | ||
2967 | /* | |
2968 | * Keep original pointer and nullify it in the stream so the delete | |
2969 | * stream call does not release the object. | |
2970 | */ | |
2971 | reg_stream->obj.ust = stream->obj; | |
2972 | stream->obj = NULL; | |
2973 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2974 | |
7972aab2 DG |
2975 | /* We don't need the streams anymore. */ |
2976 | cds_list_del(&stream->list); | |
fb45065e | 2977 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2978 | } |
421cb601 | 2979 | |
7972aab2 DG |
2980 | error: |
2981 | return ret; | |
2982 | } | |
2983 | ||
2984 | /* | |
2985 | * Create a buffer registry channel for the given session registry and | |
2986 | * application channel object. If regp pointer is valid, it's set with the | |
2987 | * created object. Important, the created object is NOT added to the session | |
2988 | * registry hash table. | |
2989 | * | |
2990 | * Return 0 on success else a negative value. | |
2991 | */ | |
2992 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2993 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2994 | { | |
2995 | int ret; | |
2996 | struct buffer_reg_channel *reg_chan = NULL; | |
2997 | ||
2998 | assert(reg_sess); | |
2999 | assert(ua_chan); | |
3000 | ||
3001 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
3002 | ||
3003 | /* Create buffer registry channel. */ | |
3004 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
3005 | if (ret < 0) { | |
3006 | goto error_create; | |
421cb601 | 3007 | } |
7972aab2 DG |
3008 | assert(reg_chan); |
3009 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 3010 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 3011 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 3012 | |
7972aab2 DG |
3013 | /* Create and add a channel registry to session. */ |
3014 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
3015 | ua_chan->tracing_channel_id); | |
3016 | if (ret < 0) { | |
3017 | goto error; | |
d88aee68 | 3018 | } |
7972aab2 | 3019 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 3020 | |
7972aab2 DG |
3021 | if (regp) { |
3022 | *regp = reg_chan; | |
3d8ca23b | 3023 | } |
d88aee68 | 3024 | |
7972aab2 | 3025 | return 0; |
3d8ca23b DG |
3026 | |
3027 | error: | |
7972aab2 DG |
3028 | /* Safe because the registry channel object was not added to any HT. */ |
3029 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3030 | error_create: | |
3d8ca23b | 3031 | return ret; |
421cb601 DG |
3032 | } |
3033 | ||
55cc08a6 | 3034 | /* |
7972aab2 DG |
3035 | * Setup buffer registry channel for the given session registry and application |
3036 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 3037 | * |
7972aab2 | 3038 | * Return 0 on success else a negative value. |
55cc08a6 | 3039 | */ |
7972aab2 | 3040 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
3041 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
3042 | struct ust_app *app) | |
55cc08a6 | 3043 | { |
7972aab2 | 3044 | int ret; |
55cc08a6 | 3045 | |
7972aab2 DG |
3046 | assert(reg_sess); |
3047 | assert(reg_chan); | |
3048 | assert(ua_chan); | |
3049 | assert(ua_chan->obj); | |
55cc08a6 | 3050 | |
7972aab2 | 3051 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 3052 | |
7972aab2 | 3053 | /* Setup all streams for the registry. */ |
fb45065e | 3054 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 3055 | if (ret < 0) { |
55cc08a6 DG |
3056 | goto error; |
3057 | } | |
3058 | ||
7972aab2 DG |
3059 | reg_chan->obj.ust = ua_chan->obj; |
3060 | ua_chan->obj = NULL; | |
55cc08a6 | 3061 | |
7972aab2 | 3062 | return 0; |
55cc08a6 DG |
3063 | |
3064 | error: | |
7972aab2 DG |
3065 | buffer_reg_channel_remove(reg_sess, reg_chan); |
3066 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
3067 | return ret; |
3068 | } | |
3069 | ||
edb67388 | 3070 | /* |
7972aab2 | 3071 | * Send buffer registry channel to the application. |
d0b96690 | 3072 | * |
7972aab2 | 3073 | * Return 0 on success else a negative value. |
edb67388 | 3074 | */ |
7972aab2 DG |
3075 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
3076 | struct ust_app *app, struct ust_app_session *ua_sess, | |
3077 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
3078 | { |
3079 | int ret; | |
7972aab2 | 3080 | struct buffer_reg_stream *reg_stream; |
edb67388 | 3081 | |
7972aab2 DG |
3082 | assert(reg_chan); |
3083 | assert(app); | |
3084 | assert(ua_sess); | |
3085 | assert(ua_chan); | |
3086 | ||
3087 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
3088 | ||
3089 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
3090 | if (ret < 0) { |
3091 | goto error; | |
3092 | } | |
3093 | ||
7972aab2 DG |
3094 | /* Send channel to the application. */ |
3095 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
3096 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3097 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
3098 | goto error; | |
3099 | } else if (ret < 0) { | |
7972aab2 DG |
3100 | goto error; |
3101 | } | |
3102 | ||
3103 | health_code_update(); | |
3104 | ||
3105 | /* Send all streams to application. */ | |
3106 | pthread_mutex_lock(®_chan->stream_list_lock); | |
3107 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
3108 | struct ust_app_stream stream; | |
3109 | ||
3110 | ret = duplicate_stream_object(reg_stream, &stream); | |
3111 | if (ret < 0) { | |
3112 | goto error_stream_unlock; | |
3113 | } | |
3114 | ||
3115 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
3116 | if (ret < 0) { | |
fb45065e | 3117 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
3118 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
3119 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 3120 | } |
7972aab2 DG |
3121 | goto error_stream_unlock; |
3122 | } | |
edb67388 | 3123 | |
7972aab2 DG |
3124 | /* |
3125 | * The return value is not important here. This function will output an | |
3126 | * error if needed. | |
3127 | */ | |
fb45065e | 3128 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
3129 | } |
3130 | ua_chan->is_sent = 1; | |
3131 | ||
3132 | error_stream_unlock: | |
3133 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
3134 | error: |
3135 | return ret; | |
3136 | } | |
3137 | ||
9730260e | 3138 | /* |
7972aab2 DG |
3139 | * Create and send to the application the created buffers with per UID buffers. |
3140 | * | |
9acdc1d6 | 3141 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 3142 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 3143 | * |
7972aab2 | 3144 | * Return 0 on success else a negative value. |
9730260e | 3145 | */ |
7972aab2 DG |
3146 | static int create_channel_per_uid(struct ust_app *app, |
3147 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3148 | struct ust_app_channel *ua_chan) | |
9730260e DG |
3149 | { |
3150 | int ret; | |
7972aab2 DG |
3151 | struct buffer_reg_uid *reg_uid; |
3152 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 3153 | struct ltt_session *session = NULL; |
e098433c JG |
3154 | enum lttng_error_code notification_ret; |
3155 | struct ust_registry_channel *chan_reg; | |
9730260e | 3156 | |
7972aab2 DG |
3157 | assert(app); |
3158 | assert(usess); | |
3159 | assert(ua_sess); | |
3160 | assert(ua_chan); | |
3161 | ||
3162 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
3163 | ||
3164 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
3165 | /* | |
3166 | * The session creation handles the creation of this global registry | |
3167 | * object. If none can be find, there is a code flow problem or a | |
3168 | * teardown race. | |
3169 | */ | |
3170 | assert(reg_uid); | |
3171 | ||
3172 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
3173 | reg_uid); | |
2721f7ea JG |
3174 | if (reg_chan) { |
3175 | goto send_channel; | |
3176 | } | |
7972aab2 | 3177 | |
2721f7ea JG |
3178 | /* Create the buffer registry channel object. */ |
3179 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
3180 | if (ret < 0) { | |
3181 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 3182 | ua_chan->name); |
2721f7ea JG |
3183 | goto error; |
3184 | } | |
f14256d6 | 3185 | |
e098433c JG |
3186 | session = session_find_by_id(ua_sess->tracing_id); |
3187 | assert(session); | |
3188 | assert(pthread_mutex_trylock(&session->lock)); | |
3189 | assert(session_trylock_list()); | |
3190 | ||
2721f7ea JG |
3191 | /* |
3192 | * Create the buffers on the consumer side. This call populates the | |
3193 | * ust app channel object with all streams and data object. | |
3194 | */ | |
3195 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3196 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 3197 | session->most_recent_chunk_id.value); |
2721f7ea JG |
3198 | if (ret < 0) { |
3199 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
3200 | ua_chan->name); | |
7972aab2 DG |
3201 | |
3202 | /* | |
2721f7ea JG |
3203 | * Let's remove the previously created buffer registry channel so |
3204 | * it's not visible anymore in the session registry. | |
7972aab2 | 3205 | */ |
2721f7ea JG |
3206 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
3207 | ua_chan->tracing_channel_id, false); | |
3208 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
3209 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
3210 | goto error; | |
7972aab2 DG |
3211 | } |
3212 | ||
2721f7ea JG |
3213 | /* |
3214 | * Setup the streams and add it to the session registry. | |
3215 | */ | |
3216 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
3217 | ua_chan, reg_chan, app); | |
3218 | if (ret < 0) { | |
3219 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
3220 | goto error; | |
3221 | } | |
3222 | ||
e098433c JG |
3223 | /* Notify the notification subsystem of the channel's creation. */ |
3224 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
3225 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
3226 | ua_chan->tracing_channel_id); | |
3227 | assert(chan_reg); | |
3228 | chan_reg->consumer_key = ua_chan->key; | |
3229 | chan_reg = NULL; | |
3230 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 3231 | |
e098433c JG |
3232 | notification_ret = notification_thread_command_add_channel( |
3233 | notification_thread_handle, session->name, | |
ff588497 JR |
3234 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3235 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3236 | ua_chan->name, | |
470cc211 | 3237 | ua_chan->key, LTTNG_DOMAIN_UST, |
e098433c JG |
3238 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3239 | if (notification_ret != LTTNG_OK) { | |
3240 | ret = - (int) notification_ret; | |
3241 | ERR("Failed to add channel to notification thread"); | |
3242 | goto error; | |
e9404c27 JG |
3243 | } |
3244 | ||
2721f7ea | 3245 | send_channel: |
66ff8e3f JG |
3246 | /* Send buffers to the application. */ |
3247 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
3248 | if (ret < 0) { | |
3249 | if (ret != -ENOTCONN) { | |
3250 | ERR("Error sending channel to application"); | |
3251 | } | |
3252 | goto error; | |
3253 | } | |
3254 | ||
9730260e | 3255 | error: |
e32d7f27 JG |
3256 | if (session) { |
3257 | session_put(session); | |
3258 | } | |
9730260e DG |
3259 | return ret; |
3260 | } | |
3261 | ||
78f0bacd | 3262 | /* |
7972aab2 DG |
3263 | * Create and send to the application the created buffers with per PID buffers. |
3264 | * | |
fad1ed2f | 3265 | * Called with UST app session lock held. |
71e0a100 | 3266 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 3267 | * |
7972aab2 | 3268 | * Return 0 on success else a negative value. |
78f0bacd | 3269 | */ |
7972aab2 DG |
3270 | static int create_channel_per_pid(struct ust_app *app, |
3271 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
3272 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3273 | { |
8535a6d9 | 3274 | int ret; |
7972aab2 | 3275 | struct ust_registry_session *registry; |
e9404c27 | 3276 | enum lttng_error_code cmd_ret; |
e32d7f27 | 3277 | struct ltt_session *session = NULL; |
e9404c27 JG |
3278 | uint64_t chan_reg_key; |
3279 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 3280 | |
7972aab2 DG |
3281 | assert(app); |
3282 | assert(usess); | |
3283 | assert(ua_sess); | |
3284 | assert(ua_chan); | |
3285 | ||
3286 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
3287 | ||
3288 | rcu_read_lock(); | |
3289 | ||
3290 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 3291 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
3292 | assert(registry); |
3293 | ||
3294 | /* Create and add a new channel registry to session. */ | |
3295 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 3296 | if (ret < 0) { |
f14256d6 MD |
3297 | ERR("Error creating the UST channel \"%s\" registry instance", |
3298 | ua_chan->name); | |
78f0bacd DG |
3299 | goto error; |
3300 | } | |
3301 | ||
e098433c JG |
3302 | session = session_find_by_id(ua_sess->tracing_id); |
3303 | assert(session); | |
3304 | ||
3305 | assert(pthread_mutex_trylock(&session->lock)); | |
3306 | assert(session_trylock_list()); | |
3307 | ||
7972aab2 DG |
3308 | /* Create and get channel on the consumer side. */ |
3309 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 3310 | app->bits_per_long, registry, |
d2956687 | 3311 | session->most_recent_chunk_id.value); |
7972aab2 | 3312 | if (ret < 0) { |
f14256d6 MD |
3313 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
3314 | ua_chan->name); | |
5b951542 | 3315 | goto error_remove_from_registry; |
7972aab2 DG |
3316 | } |
3317 | ||
3318 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
3319 | if (ret < 0) { | |
a7169585 MD |
3320 | if (ret != -ENOTCONN) { |
3321 | ERR("Error sending channel to application"); | |
3322 | } | |
5b951542 | 3323 | goto error_remove_from_registry; |
7972aab2 | 3324 | } |
8535a6d9 | 3325 | |
e9404c27 JG |
3326 | chan_reg_key = ua_chan->key; |
3327 | pthread_mutex_lock(®istry->lock); | |
3328 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
3329 | assert(chan_reg); | |
3330 | chan_reg->consumer_key = ua_chan->key; | |
3331 | pthread_mutex_unlock(®istry->lock); | |
3332 | ||
3333 | cmd_ret = notification_thread_command_add_channel( | |
3334 | notification_thread_handle, session->name, | |
ff588497 JR |
3335 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
3336 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
3337 | ua_chan->name, | |
470cc211 | 3338 | ua_chan->key, LTTNG_DOMAIN_UST, |
e9404c27 JG |
3339 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
3340 | if (cmd_ret != LTTNG_OK) { | |
3341 | ret = - (int) cmd_ret; | |
3342 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 3343 | goto error_remove_from_registry; |
e9404c27 JG |
3344 | } |
3345 | ||
5b951542 MD |
3346 | error_remove_from_registry: |
3347 | if (ret) { | |
3348 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3349 | } | |
78f0bacd | 3350 | error: |
7972aab2 | 3351 | rcu_read_unlock(); |
e32d7f27 JG |
3352 | if (session) { |
3353 | session_put(session); | |
3354 | } | |
78f0bacd DG |
3355 | return ret; |
3356 | } | |
3357 | ||
3358 | /* | |
7972aab2 | 3359 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3360 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3361 | * side lock acquired. |
3362 | * | |
fad1ed2f JR |
3363 | * Called with UST app session lock held. |
3364 | * | |
a7169585 MD |
3365 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3366 | * the application exited concurrently. | |
78f0bacd | 3367 | */ |
88e3c2f5 | 3368 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3369 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3370 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3371 | { |
7972aab2 | 3372 | int ret; |
78f0bacd | 3373 | |
7972aab2 DG |
3374 | assert(app); |
3375 | assert(usess); | |
88e3c2f5 | 3376 | assert(usess->active); |
7972aab2 DG |
3377 | assert(ua_sess); |
3378 | assert(ua_chan); | |
3379 | ||
3380 | /* Handle buffer type before sending the channel to the application. */ | |
3381 | switch (usess->buffer_type) { | |
3382 | case LTTNG_BUFFER_PER_UID: | |
3383 | { | |
3384 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3385 | if (ret < 0) { | |
3386 | goto error; | |
3387 | } | |
3388 | break; | |
3389 | } | |
3390 | case LTTNG_BUFFER_PER_PID: | |
3391 | { | |
3392 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3393 | if (ret < 0) { | |
3394 | goto error; | |
3395 | } | |
3396 | break; | |
3397 | } | |
3398 | default: | |
3399 | assert(0); | |
3400 | ret = -EINVAL; | |
78f0bacd DG |
3401 | goto error; |
3402 | } | |
3403 | ||
7972aab2 DG |
3404 | /* Initialize ust objd object using the received handle and add it. */ |
3405 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3406 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3407 | |
7972aab2 DG |
3408 | /* If channel is not enabled, disable it on the tracer */ |
3409 | if (!ua_chan->enabled) { | |
3410 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3411 | if (ret < 0) { | |
3412 | goto error; | |
3413 | } | |
78f0bacd DG |
3414 | } |
3415 | ||
3416 | error: | |
3417 | return ret; | |
3418 | } | |
3419 | ||
284d8f55 | 3420 | /* |
88e3c2f5 | 3421 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3422 | * |
36b588ed | 3423 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3424 | * |
88e3c2f5 | 3425 | * Return 0 on success or else a negative value. |
284d8f55 | 3426 | */ |
88e3c2f5 JG |
3427 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3428 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3429 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3430 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3431 | { |
3432 | int ret = 0; | |
bec39940 DG |
3433 | struct lttng_ht_iter iter; |
3434 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3435 | struct ust_app_channel *ua_chan; |
3436 | ||
3437 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3438 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3439 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3440 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3441 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3442 | goto end; |
5b4a0ec0 DG |
3443 | } |
3444 | ||
d0b96690 | 3445 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3446 | if (ua_chan == NULL) { |
3447 | /* Only malloc can fail here */ | |
4d710ac2 | 3448 | ret = -ENOMEM; |
88e3c2f5 | 3449 | goto error; |
fc34caaa DG |
3450 | } |
3451 | shadow_copy_channel(ua_chan, uchan); | |
3452 | ||
ffe60014 DG |
3453 | /* Set channel type. */ |
3454 | ua_chan->attr.type = type; | |
3455 | ||
d0b96690 DG |
3456 | /* Only add the channel if successful on the tracer side. */ |
3457 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3458 | end: |
4d710ac2 DG |
3459 | if (ua_chanp) { |
3460 | *ua_chanp = ua_chan; | |
3461 | } | |
3462 | ||
3463 | /* Everything went well. */ | |
3464 | return 0; | |
5b4a0ec0 DG |
3465 | |
3466 | error: | |
4d710ac2 | 3467 | return ret; |
5b4a0ec0 DG |
3468 | } |
3469 | ||
3470 | /* | |
3471 | * Create UST app event and create it on the tracer side. | |
d0b96690 | 3472 | * |
993578ff | 3473 | * Must be called with the RCU read side lock held. |
d0b96690 | 3474 | * Called with ust app session mutex held. |
5b4a0ec0 | 3475 | */ |
edb67388 DG |
3476 | static |
3477 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3478 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3479 | struct ust_app *app) | |
284d8f55 | 3480 | { |
edb67388 | 3481 | int ret = 0; |
5b4a0ec0 | 3482 | struct ust_app_event *ua_event; |
284d8f55 | 3483 | |
edb67388 DG |
3484 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3485 | if (ua_event == NULL) { | |
20533947 | 3486 | /* Only failure mode of alloc_ust_app_event(). */ |
edb67388 | 3487 | ret = -ENOMEM; |
fc34caaa | 3488 | goto end; |
5b4a0ec0 | 3489 | } |
edb67388 | 3490 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3491 | |
edb67388 | 3492 | /* Create it on the tracer side */ |
5b4a0ec0 | 3493 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3494 | if (ret < 0) { |
e9f11505 JG |
3495 | /* |
3496 | * Not found previously means that it does not exist on the | |
3497 | * tracer. If the application reports that the event existed, | |
3498 | * it means there is a bug in the sessiond or lttng-ust | |
3499 | * (or corruption, etc.) | |
3500 | */ | |
3501 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3502 | ERR("Tracer for application reported that an event being created already existed: " | |
3503 | "event_name = \"%s\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3504 | uevent->attr.name, | |
3505 | app->pid, app->ppid, app->uid, | |
3506 | app->gid); | |
3507 | } | |
284d8f55 DG |
3508 | goto error; |
3509 | } | |
3510 | ||
d0b96690 | 3511 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3512 | |
993578ff JR |
3513 | DBG2("UST app create event completed: app = '%s' (ppid: %d)", |
3514 | app->name, app->ppid); | |
7f79d3a1 | 3515 | |
edb67388 | 3516 | end: |
fc34caaa DG |
3517 | return ret; |
3518 | ||
5b4a0ec0 | 3519 | error: |
fc34caaa | 3520 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3521 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3522 | return ret; |
5b4a0ec0 DG |
3523 | } |
3524 | ||
993578ff JR |
3525 | /* |
3526 | * Create UST app event notifier rule and create it on the tracer side. | |
3527 | * | |
3528 | * Must be called with the RCU read side lock held. | |
3529 | * Called with ust app session mutex held. | |
3530 | */ | |
3531 | static | |
3532 | int create_ust_app_event_notifier_rule(struct lttng_event_rule *rule, | |
3533 | struct ust_app *app, uint64_t token) | |
3534 | { | |
3535 | int ret = 0; | |
3536 | struct ust_app_event_notifier_rule *ua_event_notifier_rule; | |
3537 | ||
3538 | ua_event_notifier_rule = alloc_ust_app_event_notifier_rule(rule, token); | |
3539 | if (ua_event_notifier_rule == NULL) { | |
3540 | ret = -ENOMEM; | |
3541 | goto end; | |
3542 | } | |
3543 | ||
3544 | /* Create it on the tracer side. */ | |
3545 | ret = create_ust_event_notifier(app, ua_event_notifier_rule); | |
3546 | if (ret < 0) { | |
3547 | /* | |
3548 | * Not found previously means that it does not exist on the | |
3549 | * tracer. If the application reports that the event existed, | |
3550 | * it means there is a bug in the sessiond or lttng-ust | |
3551 | * (or corruption, etc.) | |
3552 | */ | |
3553 | if (ret == -LTTNG_UST_ERR_EXIST) { | |
3554 | ERR("Tracer for application reported that an event notifier being created already exists: " | |
3555 | "token = \"%" PRIu64 "\", pid = %d, ppid = %d, uid = %d, gid = %d", | |
3556 | token, | |
3557 | app->pid, app->ppid, app->uid, | |
3558 | app->gid); | |
3559 | } | |
3560 | goto error; | |
3561 | } | |
3562 | ||
3563 | lttng_ht_add_unique_u64(app->token_to_event_notifier_rule_ht, | |
3564 | &ua_event_notifier_rule->node); | |
3565 | ||
3566 | DBG2("UST app create token event rule completed: app = '%s' (ppid: %d), token = %" PRIu64, | |
3567 | app->name, app->ppid, token); | |
3568 | ||
3569 | end: | |
3570 | return ret; | |
3571 | ||
3572 | error: | |
3573 | /* The RCU read side lock is already being held by the caller. */ | |
3574 | delete_ust_app_event_notifier_rule(-1, ua_event_notifier_rule, app); | |
3575 | return ret; | |
3576 | } | |
3577 | ||
5b4a0ec0 DG |
3578 | /* |
3579 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3580 | * |
7972aab2 | 3581 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3582 | */ |
3583 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3584 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3585 | { |
3586 | int ret = 0; | |
ffe60014 | 3587 | struct ust_app_channel *metadata; |
d88aee68 | 3588 | struct consumer_socket *socket; |
7972aab2 | 3589 | struct ust_registry_session *registry; |
e32d7f27 | 3590 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3591 | |
ffe60014 DG |
3592 | assert(ua_sess); |
3593 | assert(app); | |
d88aee68 | 3594 | assert(consumer); |
5b4a0ec0 | 3595 | |
7972aab2 | 3596 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3597 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3598 | assert(registry); |
3599 | ||
ce34fcd0 MD |
3600 | pthread_mutex_lock(®istry->lock); |
3601 | ||
1b532a60 DG |
3602 | /* Metadata already exists for this registry or it was closed previously */ |
3603 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3604 | ret = 0; |
3605 | goto error; | |
5b4a0ec0 DG |
3606 | } |
3607 | ||
ffe60014 | 3608 | /* Allocate UST metadata */ |
d0b96690 | 3609 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3610 | if (!metadata) { |
3611 | /* malloc() failed */ | |
3612 | ret = -ENOMEM; | |
3613 | goto error; | |
3614 | } | |
5b4a0ec0 | 3615 | |
ad7a9107 | 3616 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3617 | |
7972aab2 DG |
3618 | /* Need one fd for the channel. */ |
3619 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3620 | if (ret < 0) { | |
3621 | ERR("Exhausted number of available FD upon create metadata"); | |
3622 | goto error; | |
3623 | } | |
3624 | ||
4dc3dfc5 DG |
3625 | /* Get the right consumer socket for the application. */ |
3626 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3627 | if (!socket) { | |
3628 | ret = -EINVAL; | |
3629 | goto error_consumer; | |
3630 | } | |
3631 | ||
331744e3 JD |
3632 | /* |
3633 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3634 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3635 | * consumer requesting the metadata and the ask_channel call on our side | |
3636 | * did not returned yet. | |
3637 | */ | |
3638 | registry->metadata_key = metadata->key; | |
3639 | ||
e098433c JG |
3640 | session = session_find_by_id(ua_sess->tracing_id); |
3641 | assert(session); | |
3642 | ||
3643 | assert(pthread_mutex_trylock(&session->lock)); | |
3644 | assert(session_trylock_list()); | |
3645 | ||
d88aee68 DG |
3646 | /* |
3647 | * Ask the metadata channel creation to the consumer. The metadata object | |
3648 | * will be created by the consumer and kept their. However, the stream is | |
3649 | * never added or monitored until we do a first push metadata to the | |
3650 | * consumer. | |
3651 | */ | |
7972aab2 | 3652 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3653 | registry, session->current_trace_chunk); |
d88aee68 | 3654 | if (ret < 0) { |
f2a444f1 DG |
3655 | /* Nullify the metadata key so we don't try to close it later on. */ |
3656 | registry->metadata_key = 0; | |
d88aee68 DG |
3657 | goto error_consumer; |
3658 | } | |
3659 | ||
3660 | /* | |
3661 | * The setup command will make the metadata stream be sent to the relayd, | |
3662 | * if applicable, and the thread managing the metadatas. This is important | |
3663 | * because after this point, if an error occurs, the only way the stream | |
3664 | * can be deleted is to be monitored in the consumer. | |
3665 | */ | |
7972aab2 | 3666 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3667 | if (ret < 0) { |
f2a444f1 DG |
3668 | /* Nullify the metadata key so we don't try to close it later on. */ |
3669 | registry->metadata_key = 0; | |
d88aee68 | 3670 | goto error_consumer; |
5b4a0ec0 DG |
3671 | } |
3672 | ||
7972aab2 DG |
3673 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3674 | metadata->key, app->pid); | |
5b4a0ec0 | 3675 | |
d88aee68 | 3676 | error_consumer: |
b80f0b6c | 3677 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3678 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3679 | error: |
ce34fcd0 | 3680 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3681 | if (session) { |
3682 | session_put(session); | |
3683 | } | |
ffe60014 | 3684 | return ret; |
5b4a0ec0 DG |
3685 | } |
3686 | ||
5b4a0ec0 | 3687 | /* |
d88aee68 DG |
3688 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3689 | * acquired before calling this function. | |
5b4a0ec0 DG |
3690 | */ |
3691 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3692 | { | |
d88aee68 | 3693 | struct ust_app *app = NULL; |
bec39940 DG |
3694 | struct lttng_ht_node_ulong *node; |
3695 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3696 | |
bec39940 DG |
3697 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3698 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3699 | if (node == NULL) { |
3700 | DBG2("UST app no found with pid %d", pid); | |
3701 | goto error; | |
3702 | } | |
5b4a0ec0 DG |
3703 | |
3704 | DBG2("Found UST app by pid %d", pid); | |
3705 | ||
d88aee68 | 3706 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3707 | |
3708 | error: | |
d88aee68 | 3709 | return app; |
5b4a0ec0 DG |
3710 | } |
3711 | ||
d88aee68 DG |
3712 | /* |
3713 | * Allocate and init an UST app object using the registration information and | |
3714 | * the command socket. This is called when the command socket connects to the | |
3715 | * session daemon. | |
3716 | * | |
3717 | * The object is returned on success or else NULL. | |
3718 | */ | |
d0b96690 | 3719 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3720 | { |
5e2abfaf | 3721 | int ret; |
d0b96690 | 3722 | struct ust_app *lta = NULL; |
da873412 | 3723 | struct lttng_pipe *event_notifier_event_source_pipe = NULL; |
d0b96690 DG |
3724 | |
3725 | assert(msg); | |
3726 | assert(sock >= 0); | |
3727 | ||
3728 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3729 | |
173af62f DG |
3730 | if ((msg->bits_per_long == 64 && |
3731 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3732 | || (msg->bits_per_long == 32 && | |
3733 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3734 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3735 | "%d-bit long, but no consumerd for this size is available.\n", |
3736 | msg->name, msg->pid, msg->bits_per_long); | |
3737 | goto error; | |
3f2c5fcc | 3738 | } |
d0b96690 | 3739 | |
5e2abfaf JG |
3740 | /* |
3741 | * Reserve the two file descriptors of the event source pipe. The write | |
3742 | * end will be closed once it is passed to the application, at which | |
3743 | * point a single 'put' will be performed. | |
3744 | */ | |
3745 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
3746 | if (ret) { | |
3747 | ERR("Failed to reserve two file descriptors for the event source pipe while creating a new application instance: app = '%s' (ppid: %d)", | |
3748 | msg->name, (int) msg->ppid); | |
3749 | goto error; | |
3750 | } | |
3751 | ||
da873412 JR |
3752 | event_notifier_event_source_pipe = lttng_pipe_open(FD_CLOEXEC); |
3753 | if (!event_notifier_event_source_pipe) { | |
3754 | PERROR("Failed to open application event source pipe: '%s' (ppid = %d)", | |
3755 | msg->name, msg->ppid); | |
3756 | goto error; | |
3757 | } | |
3758 | ||
5b4a0ec0 DG |
3759 | lta = zmalloc(sizeof(struct ust_app)); |
3760 | if (lta == NULL) { | |
3761 | PERROR("malloc"); | |
da873412 | 3762 | goto error_free_pipe; |
5b4a0ec0 DG |
3763 | } |
3764 | ||
da873412 JR |
3765 | lta->event_notifier_group.event_pipe = event_notifier_event_source_pipe; |
3766 | ||
5b4a0ec0 DG |
3767 | lta->ppid = msg->ppid; |
3768 | lta->uid = msg->uid; | |
3769 | lta->gid = msg->gid; | |
d0b96690 | 3770 | |
7753dea8 | 3771 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3772 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3773 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3774 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3775 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3776 | lta->long_alignment = msg->long_alignment; | |
3777 | lta->byte_order = msg->byte_order; | |
3778 | ||
5b4a0ec0 DG |
3779 | lta->v_major = msg->major; |
3780 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3781 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3782 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3783 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3784 | lta->notify_sock = -1; |
993578ff | 3785 | lta->token_to_event_notifier_rule_ht = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d88aee68 DG |
3786 | |
3787 | /* Copy name and make sure it's NULL terminated. */ | |
3788 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3789 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3790 | ||
3791 | /* | |
3792 | * Before this can be called, when receiving the registration information, | |
3793 | * the application compatibility is checked. So, at this point, the | |
3794 | * application can work with this session daemon. | |
3795 | */ | |
d0b96690 | 3796 | lta->compatible = 1; |
5b4a0ec0 | 3797 | |
852d0037 | 3798 | lta->pid = msg->pid; |
d0b96690 | 3799 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3800 | lta->sock = sock; |
fb45065e | 3801 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3802 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3803 | |
d42f20df | 3804 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 | 3805 | return lta; |
da873412 JR |
3806 | |
3807 | error_free_pipe: | |
3808 | lttng_pipe_destroy(event_notifier_event_source_pipe); | |
5e2abfaf | 3809 | lttng_fd_put(LTTNG_FD_APPS, 2); |
da873412 JR |
3810 | error: |
3811 | return NULL; | |
d0b96690 DG |
3812 | } |
3813 | ||
d88aee68 DG |
3814 | /* |
3815 | * For a given application object, add it to every hash table. | |
3816 | */ | |
d0b96690 DG |
3817 | void ust_app_add(struct ust_app *app) |
3818 | { | |
3819 | assert(app); | |
3820 | assert(app->notify_sock >= 0); | |
3821 | ||
940c4592 JR |
3822 | app->registration_time = time(NULL); |
3823 | ||
5b4a0ec0 | 3824 | rcu_read_lock(); |
852d0037 DG |
3825 | |
3826 | /* | |
3827 | * On a re-registration, we want to kick out the previous registration of | |
3828 | * that pid | |
3829 | */ | |
d0b96690 | 3830 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3831 | |
3832 | /* | |
3833 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3834 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3835 | * already in the table. | |
3836 | */ | |
d0b96690 | 3837 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3838 | |
d0b96690 DG |
3839 | /* Add application to the notify socket hash table. */ |
3840 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3841 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3842 | |
d0b96690 | 3843 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3844 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3845 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3846 | app->v_minor); | |
5b4a0ec0 | 3847 | |
d0b96690 DG |
3848 | rcu_read_unlock(); |
3849 | } | |
3850 | ||
d88aee68 DG |
3851 | /* |
3852 | * Set the application version into the object. | |
3853 | * | |
3854 | * Return 0 on success else a negative value either an errno code or a | |
3855 | * LTTng-UST error code. | |
3856 | */ | |
d0b96690 DG |
3857 | int ust_app_version(struct ust_app *app) |
3858 | { | |
d88aee68 DG |
3859 | int ret; |
3860 | ||
d0b96690 | 3861 | assert(app); |
d88aee68 | 3862 | |
fb45065e | 3863 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3864 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3865 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3866 | if (ret < 0) { |
3867 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3868 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3869 | } else { |
5368d366 | 3870 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3871 | } |
3872 | } | |
3873 | ||
3874 | return ret; | |
5b4a0ec0 DG |
3875 | } |
3876 | ||
da873412 JR |
3877 | /* |
3878 | * Setup the base event notifier group. | |
3879 | * | |
3880 | * Return 0 on success else a negative value either an errno code or a | |
3881 | * LTTng-UST error code. | |
3882 | */ | |
3883 | int ust_app_setup_event_notifier_group(struct ust_app *app) | |
3884 | { | |
3885 | int ret; | |
3886 | int event_pipe_write_fd; | |
3887 | struct lttng_ust_object_data *event_notifier_group = NULL; | |
3888 | enum lttng_error_code lttng_ret; | |
3889 | ||
3890 | assert(app); | |
3891 | ||
3892 | /* Get the write side of the pipe. */ | |
3893 | event_pipe_write_fd = lttng_pipe_get_writefd( | |
3894 | app->event_notifier_group.event_pipe); | |
3895 | ||
3896 | pthread_mutex_lock(&app->sock_lock); | |
3897 | ret = ustctl_create_event_notifier_group(app->sock, | |
3898 | event_pipe_write_fd, &event_notifier_group); | |
3899 | pthread_mutex_unlock(&app->sock_lock); | |
3900 | if (ret < 0) { | |
3901 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
3902 | ERR("Failed to create application event notifier group: ret = %d, app socket fd = %d, event_pipe_write_fd = %d", | |
3903 | ret, app->sock, event_pipe_write_fd); | |
3904 | } else { | |
3905 | DBG("Failed to create application event notifier group (application is dead): app socket fd = %d", | |
3906 | app->sock); | |
3907 | } | |
3908 | ||
3909 | goto error; | |
3910 | } | |
3911 | ||
5d4193fd JG |
3912 | ret = lttng_pipe_write_close(app->event_notifier_group.event_pipe); |
3913 | if (ret) { | |
3914 | ERR("Failed to close write end of the application's event source pipe: app = '%s' (ppid = %d)", | |
3915 | app->name, app->ppid); | |
3916 | goto error; | |
3917 | } | |
3918 | ||
5e2abfaf JG |
3919 | /* |
3920 | * Release the file descriptor that was reserved for the write-end of | |
3921 | * the pipe. | |
3922 | */ | |
3923 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
3924 | ||
da873412 JR |
3925 | lttng_ret = notification_thread_command_add_tracer_event_source( |
3926 | notification_thread_handle, | |
3927 | lttng_pipe_get_readfd(app->event_notifier_group.event_pipe), | |
3928 | LTTNG_DOMAIN_UST); | |
3929 | if (lttng_ret != LTTNG_OK) { | |
3930 | ERR("Failed to add tracer event source to notification thread"); | |
3931 | ret = - 1; | |
3932 | goto error; | |
3933 | } | |
3934 | ||
3935 | /* Assign handle only when the complete setup is valid. */ | |
3936 | app->event_notifier_group.object = event_notifier_group; | |
3937 | return ret; | |
3938 | ||
3939 | error: | |
3940 | ustctl_release_object(app->sock, app->event_notifier_group.object); | |
3941 | free(app->event_notifier_group.object); | |
3942 | return ret; | |
3943 | } | |
3944 | ||
5b4a0ec0 DG |
3945 | /* |
3946 | * Unregister app by removing it from the global traceable app list and freeing | |
3947 | * the data struct. | |
3948 | * | |
3949 | * The socket is already closed at this point so no close to sock. | |
3950 | */ | |
3951 | void ust_app_unregister(int sock) | |
3952 | { | |
3953 | struct ust_app *lta; | |
bec39940 | 3954 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3955 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3956 | struct lttng_ht_iter iter; |
d42f20df | 3957 | struct ust_app_session *ua_sess; |
525b0740 | 3958 | int ret; |
5b4a0ec0 DG |
3959 | |
3960 | rcu_read_lock(); | |
886459c6 | 3961 | |
5b4a0ec0 | 3962 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3963 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3964 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3965 | assert(node); |
284d8f55 | 3966 | |
852d0037 | 3967 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3968 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3969 | ||
d88aee68 | 3970 | /* |
ce34fcd0 MD |
3971 | * For per-PID buffers, perform "push metadata" and flush all |
3972 | * application streams before removing app from hash tables, | |
3973 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3974 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3975 | */ |
d42f20df DG |
3976 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3977 | node.node) { | |
7972aab2 DG |
3978 | struct ust_registry_session *registry; |
3979 | ||
d42f20df DG |
3980 | ret = lttng_ht_del(lta->sessions, &iter); |
3981 | if (ret) { | |
3982 | /* The session was already removed so scheduled for teardown. */ | |
3983 | continue; | |
3984 | } | |
3985 | ||
ce34fcd0 MD |
3986 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3987 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3988 | } | |
c4b88406 | 3989 | |
d42f20df DG |
3990 | /* |
3991 | * Add session to list for teardown. This is safe since at this point we | |
3992 | * are the only one using this list. | |
3993 | */ | |
d88aee68 DG |
3994 | pthread_mutex_lock(&ua_sess->lock); |
3995 | ||
b161602a MD |
3996 | if (ua_sess->deleted) { |
3997 | pthread_mutex_unlock(&ua_sess->lock); | |
3998 | continue; | |
3999 | } | |
4000 | ||
d88aee68 DG |
4001 | /* |
4002 | * Normally, this is done in the delete session process which is | |
4003 | * executed in the call rcu below. However, upon registration we can't | |
4004 | * afford to wait for the grace period before pushing data or else the | |
4005 | * data pending feature can race between the unregistration and stop | |
4006 | * command where the data pending command is sent *before* the grace | |
4007 | * period ended. | |
4008 | * | |
4009 | * The close metadata below nullifies the metadata pointer in the | |
4010 | * session so the delete session will NOT push/close a second time. | |
4011 | */ | |
7972aab2 | 4012 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 4013 | if (registry) { |
7972aab2 DG |
4014 | /* Push metadata for application before freeing the application. */ |
4015 | (void) push_metadata(registry, ua_sess->consumer); | |
4016 | ||
4017 | /* | |
4018 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
4019 | * metadata only on destroy trace session in this case. Also, the |
4020 | * previous push metadata could have flag the metadata registry to | |
4021 | * close so don't send a close command if closed. | |
7972aab2 | 4022 | */ |
ce34fcd0 | 4023 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
4024 | /* And ask to close it for this session registry. */ |
4025 | (void) close_metadata(registry, ua_sess->consumer); | |
4026 | } | |
4027 | } | |
d42f20df | 4028 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 4029 | |
d88aee68 | 4030 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
4031 | } |
4032 | ||
c4b88406 MD |
4033 | /* Remove application from PID hash table */ |
4034 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
4035 | assert(!ret); | |
4036 | ||
4037 | /* | |
4038 | * Remove application from notify hash table. The thread handling the | |
4039 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
4040 | * either way it's valid. The close of that socket is handled by the |
4041 | * apps_notify_thread. | |
c4b88406 MD |
4042 | */ |
4043 | iter.iter.node = <a->notify_sock_n.node; | |
4044 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
4045 | ||
4046 | /* | |
4047 | * Ignore return value since the node might have been removed before by an | |
4048 | * add replace during app registration because the PID can be reassigned by | |
4049 | * the OS. | |
4050 | */ | |
4051 | iter.iter.node = <a->pid_n.node; | |
4052 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4053 | if (ret) { | |
4054 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
4055 | lta->pid); | |
4056 | } | |
4057 | ||
852d0037 DG |
4058 | /* Free memory */ |
4059 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
4060 | ||
5b4a0ec0 DG |
4061 | rcu_read_unlock(); |
4062 | return; | |
284d8f55 DG |
4063 | } |
4064 | ||
5b4a0ec0 DG |
4065 | /* |
4066 | * Fill events array with all events name of all registered apps. | |
4067 | */ | |
4068 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 4069 | { |
5b4a0ec0 DG |
4070 | int ret, handle; |
4071 | size_t nbmem, count = 0; | |
bec39940 | 4072 | struct lttng_ht_iter iter; |
5b4a0ec0 | 4073 | struct ust_app *app; |
c617c0c6 | 4074 | struct lttng_event *tmp_event; |
421cb601 | 4075 | |
5b4a0ec0 | 4076 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
4077 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
4078 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
4079 | PERROR("zmalloc ust app events"); |
4080 | ret = -ENOMEM; | |
421cb601 DG |
4081 | goto error; |
4082 | } | |
4083 | ||
5b4a0ec0 | 4084 | rcu_read_lock(); |
421cb601 | 4085 | |
852d0037 | 4086 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 4087 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 4088 | |
840cb59c | 4089 | health_code_update(); |
86acf0da | 4090 | |
e0c7ec2b DG |
4091 | if (!app->compatible) { |
4092 | /* | |
4093 | * TODO: In time, we should notice the caller of this error by | |
4094 | * telling him that this is a version error. | |
4095 | */ | |
4096 | continue; | |
4097 | } | |
fb45065e | 4098 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4099 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 4100 | if (handle < 0) { |
ffe60014 DG |
4101 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4102 | ERR("UST app list events getting handle failed for app pid %d", | |
4103 | app->pid); | |
4104 | } | |
fb45065e | 4105 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
4106 | continue; |
4107 | } | |
421cb601 | 4108 | |
852d0037 | 4109 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 4110 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4111 | /* Handle ustctl error. */ |
4112 | if (ret < 0) { | |
fb45065e MD |
4113 | int release_ret; |
4114 | ||
a2ba1ab0 | 4115 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4116 | ERR("UST app tp list get failed for app %d with ret %d", |
4117 | app->sock, ret); | |
4118 | } else { | |
4119 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
4120 | /* |
4121 | * This is normal behavior, an application can die during the | |
4122 | * creation process. Don't report an error so the execution can | |
4123 | * continue normally. Continue normal execution. | |
4124 | */ | |
4125 | break; | |
ffe60014 | 4126 | } |
98f595d4 | 4127 | free(tmp_event); |
fb45065e | 4128 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4129 | if (release_ret < 0 && |
4130 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4131 | release_ret != -EPIPE) { | |
fb45065e MD |
4132 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4133 | } | |
4134 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
4135 | goto rcu_error; |
4136 | } | |
4137 | ||
840cb59c | 4138 | health_code_update(); |
815564d8 | 4139 | if (count >= nbmem) { |
d7b3776f | 4140 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4141 | struct lttng_event *new_tmp_event; |
4142 | size_t new_nbmem; | |
4143 | ||
4144 | new_nbmem = nbmem << 1; | |
4145 | DBG2("Reallocating event list from %zu to %zu entries", | |
4146 | nbmem, new_nbmem); | |
4147 | new_tmp_event = realloc(tmp_event, | |
4148 | new_nbmem * sizeof(struct lttng_event)); | |
4149 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4150 | int release_ret; |
4151 | ||
5b4a0ec0 | 4152 | PERROR("realloc ust app events"); |
c617c0c6 | 4153 | free(tmp_event); |
5b4a0ec0 | 4154 | ret = -ENOMEM; |
fb45065e | 4155 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
4156 | if (release_ret < 0 && |
4157 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4158 | release_ret != -EPIPE) { | |
fb45065e MD |
4159 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4160 | } | |
4161 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
4162 | goto rcu_error; |
4163 | } | |
53efb85a MD |
4164 | /* Zero the new memory */ |
4165 | memset(new_tmp_event + nbmem, 0, | |
4166 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
4167 | nbmem = new_nbmem; | |
4168 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 4169 | } |
c617c0c6 MD |
4170 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
4171 | tmp_event[count].loglevel = uiter.loglevel; | |
4172 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
4173 | tmp_event[count].pid = app->pid; | |
4174 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 4175 | count++; |
421cb601 | 4176 | } |
fb45065e MD |
4177 | ret = ustctl_release_handle(app->sock, handle); |
4178 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 4179 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
4180 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4181 | } | |
421cb601 DG |
4182 | } |
4183 | ||
5b4a0ec0 | 4184 | ret = count; |
c617c0c6 | 4185 | *events = tmp_event; |
421cb601 | 4186 | |
5b4a0ec0 | 4187 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 4188 | |
5b4a0ec0 DG |
4189 | rcu_error: |
4190 | rcu_read_unlock(); | |
421cb601 | 4191 | error: |
840cb59c | 4192 | health_code_update(); |
5b4a0ec0 | 4193 | return ret; |
421cb601 DG |
4194 | } |
4195 | ||
f37d259d MD |
4196 | /* |
4197 | * Fill events array with all events name of all registered apps. | |
4198 | */ | |
4199 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
4200 | { | |
4201 | int ret, handle; | |
4202 | size_t nbmem, count = 0; | |
4203 | struct lttng_ht_iter iter; | |
4204 | struct ust_app *app; | |
c617c0c6 | 4205 | struct lttng_event_field *tmp_event; |
f37d259d MD |
4206 | |
4207 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
4208 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
4209 | if (tmp_event == NULL) { | |
f37d259d MD |
4210 | PERROR("zmalloc ust app event fields"); |
4211 | ret = -ENOMEM; | |
4212 | goto error; | |
4213 | } | |
4214 | ||
4215 | rcu_read_lock(); | |
4216 | ||
4217 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4218 | struct lttng_ust_field_iter uiter; | |
4219 | ||
840cb59c | 4220 | health_code_update(); |
86acf0da | 4221 | |
f37d259d MD |
4222 | if (!app->compatible) { |
4223 | /* | |
4224 | * TODO: In time, we should notice the caller of this error by | |
4225 | * telling him that this is a version error. | |
4226 | */ | |
4227 | continue; | |
4228 | } | |
fb45065e | 4229 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
4230 | handle = ustctl_tracepoint_field_list(app->sock); |
4231 | if (handle < 0) { | |
ffe60014 DG |
4232 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
4233 | ERR("UST app list field getting handle failed for app pid %d", | |
4234 | app->pid); | |
4235 | } | |
fb45065e | 4236 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
4237 | continue; |
4238 | } | |
4239 | ||
4240 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 4241 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
4242 | /* Handle ustctl error. */ |
4243 | if (ret < 0) { | |
fb45065e MD |
4244 | int release_ret; |
4245 | ||
a2ba1ab0 | 4246 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
4247 | ERR("UST app tp list field failed for app %d with ret %d", |
4248 | app->sock, ret); | |
4249 | } else { | |
4250 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
4251 | /* |
4252 | * This is normal behavior, an application can die during the | |
4253 | * creation process. Don't report an error so the execution can | |
98f595d4 | 4254 | * continue normally. Reset list and count for next app. |
3757b385 DG |
4255 | */ |
4256 | break; | |
ffe60014 | 4257 | } |
98f595d4 | 4258 | free(tmp_event); |
fb45065e MD |
4259 | release_ret = ustctl_release_handle(app->sock, handle); |
4260 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4261 | if (release_ret < 0 && |
4262 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4263 | release_ret != -EPIPE) { | |
fb45065e MD |
4264 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4265 | } | |
ffe60014 DG |
4266 | goto rcu_error; |
4267 | } | |
4268 | ||
840cb59c | 4269 | health_code_update(); |
f37d259d | 4270 | if (count >= nbmem) { |
d7b3776f | 4271 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
4272 | struct lttng_event_field *new_tmp_event; |
4273 | size_t new_nbmem; | |
4274 | ||
4275 | new_nbmem = nbmem << 1; | |
4276 | DBG2("Reallocating event field list from %zu to %zu entries", | |
4277 | nbmem, new_nbmem); | |
4278 | new_tmp_event = realloc(tmp_event, | |
4279 | new_nbmem * sizeof(struct lttng_event_field)); | |
4280 | if (new_tmp_event == NULL) { | |
fb45065e MD |
4281 | int release_ret; |
4282 | ||
f37d259d | 4283 | PERROR("realloc ust app event fields"); |
c617c0c6 | 4284 | free(tmp_event); |
f37d259d | 4285 | ret = -ENOMEM; |
fb45065e MD |
4286 | release_ret = ustctl_release_handle(app->sock, handle); |
4287 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4288 | if (release_ret && |
4289 | release_ret != -LTTNG_UST_ERR_EXITING && | |
4290 | release_ret != -EPIPE) { | |
fb45065e MD |
4291 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
4292 | } | |
f37d259d MD |
4293 | goto rcu_error; |
4294 | } | |
53efb85a MD |
4295 | /* Zero the new memory */ |
4296 | memset(new_tmp_event + nbmem, 0, | |
4297 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
4298 | nbmem = new_nbmem; | |
4299 | tmp_event = new_tmp_event; | |
f37d259d | 4300 | } |
f37d259d | 4301 | |
c617c0c6 | 4302 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
4303 | /* Mapping between these enums matches 1 to 1. */ |
4304 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 4305 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 4306 | |
c617c0c6 MD |
4307 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
4308 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 4309 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
4310 | tmp_event[count].event.pid = app->pid; |
4311 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
4312 | count++; |
4313 | } | |
fb45065e MD |
4314 | ret = ustctl_release_handle(app->sock, handle); |
4315 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
4316 | if (ret < 0 && |
4317 | ret != -LTTNG_UST_ERR_EXITING && | |
4318 | ret != -EPIPE) { | |
fb45065e MD |
4319 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
4320 | } | |
f37d259d MD |
4321 | } |
4322 | ||
4323 | ret = count; | |
c617c0c6 | 4324 | *fields = tmp_event; |
f37d259d MD |
4325 | |
4326 | DBG2("UST app list event fields done (%zu events)", count); | |
4327 | ||
4328 | rcu_error: | |
4329 | rcu_read_unlock(); | |
4330 | error: | |
840cb59c | 4331 | health_code_update(); |
f37d259d MD |
4332 | return ret; |
4333 | } | |
4334 | ||
5b4a0ec0 DG |
4335 | /* |
4336 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
4337 | * |
4338 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
4339 | */ |
4340 | void ust_app_clean_list(void) | |
421cb601 | 4341 | { |
5b4a0ec0 | 4342 | int ret; |
659ed79f | 4343 | struct ust_app *app; |
bec39940 | 4344 | struct lttng_ht_iter iter; |
421cb601 | 4345 | |
5b4a0ec0 | 4346 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 4347 | |
5b4a0ec0 | 4348 | rcu_read_lock(); |
421cb601 | 4349 | |
faadaa3a JG |
4350 | /* Cleanup notify socket hash table */ |
4351 | if (ust_app_ht_by_notify_sock) { | |
4352 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
4353 | notify_sock_n.node) { | |
b69a1b40 JG |
4354 | /* |
4355 | * Assert that all notifiers are gone as all triggers | |
4356 | * are unregistered prior to this clean-up. | |
4357 | */ | |
4358 | assert(lttng_ht_get_count(app->token_to_event_notifier_rule_ht) == 0); | |
faadaa3a | 4359 | |
faadaa3a JG |
4360 | ust_app_notify_sock_unregister(app->notify_sock); |
4361 | } | |
4362 | } | |
4363 | ||
f1b711c4 MD |
4364 | if (ust_app_ht) { |
4365 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4366 | ret = lttng_ht_del(ust_app_ht, &iter); | |
4367 | assert(!ret); | |
4368 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
4369 | } | |
421cb601 DG |
4370 | } |
4371 | ||
852d0037 | 4372 | /* Cleanup socket hash table */ |
f1b711c4 MD |
4373 | if (ust_app_ht_by_sock) { |
4374 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
4375 | sock_n.node) { | |
4376 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
4377 | assert(!ret); | |
4378 | } | |
bec39940 | 4379 | } |
852d0037 | 4380 | |
36b588ed | 4381 | rcu_read_unlock(); |
d88aee68 | 4382 | |
bec39940 | 4383 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
4384 | if (ust_app_ht) { |
4385 | ht_cleanup_push(ust_app_ht); | |
4386 | } | |
4387 | if (ust_app_ht_by_sock) { | |
4388 | ht_cleanup_push(ust_app_ht_by_sock); | |
4389 | } | |
4390 | if (ust_app_ht_by_notify_sock) { | |
4391 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
4392 | } | |
5b4a0ec0 DG |
4393 | } |
4394 | ||
4395 | /* | |
4396 | * Init UST app hash table. | |
4397 | */ | |
57703f6e | 4398 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 4399 | { |
bec39940 | 4400 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4401 | if (!ust_app_ht) { |
4402 | return -1; | |
4403 | } | |
852d0037 | 4404 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4405 | if (!ust_app_ht_by_sock) { |
4406 | return -1; | |
4407 | } | |
d0b96690 | 4408 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
4409 | if (!ust_app_ht_by_notify_sock) { |
4410 | return -1; | |
4411 | } | |
4412 | return 0; | |
421cb601 DG |
4413 | } |
4414 | ||
78f0bacd DG |
4415 | /* |
4416 | * For a specific UST session, disable the channel for all registered apps. | |
4417 | */ | |
35a9059d | 4418 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4419 | struct ltt_ust_channel *uchan) |
4420 | { | |
4421 | int ret = 0; | |
bec39940 DG |
4422 | struct lttng_ht_iter iter; |
4423 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
4424 | struct ust_app *app; |
4425 | struct ust_app_session *ua_sess; | |
8535a6d9 | 4426 | struct ust_app_channel *ua_chan; |
78f0bacd | 4427 | |
88e3c2f5 | 4428 | assert(usess->active); |
d9bf3ca4 | 4429 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 4430 | uchan->name, usess->id); |
78f0bacd DG |
4431 | |
4432 | rcu_read_lock(); | |
4433 | ||
4434 | /* For every registered applications */ | |
852d0037 | 4435 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 4436 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
4437 | if (!app->compatible) { |
4438 | /* | |
4439 | * TODO: In time, we should notice the caller of this error by | |
4440 | * telling him that this is a version error. | |
4441 | */ | |
4442 | continue; | |
4443 | } | |
78f0bacd DG |
4444 | ua_sess = lookup_session_by_app(usess, app); |
4445 | if (ua_sess == NULL) { | |
4446 | continue; | |
4447 | } | |
4448 | ||
8535a6d9 | 4449 | /* Get channel */ |
bec39940 DG |
4450 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4451 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
4452 | /* If the session if found for the app, the channel must be there */ |
4453 | assert(ua_chan_node); | |
4454 | ||
4455 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4456 | /* The channel must not be already disabled */ | |
4457 | assert(ua_chan->enabled == 1); | |
4458 | ||
4459 | /* Disable channel onto application */ | |
4460 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
4461 | if (ret < 0) { |
4462 | /* XXX: We might want to report this error at some point... */ | |
4463 | continue; | |
4464 | } | |
4465 | } | |
4466 | ||
4467 | rcu_read_unlock(); | |
78f0bacd DG |
4468 | return ret; |
4469 | } | |
4470 | ||
4471 | /* | |
4472 | * For a specific UST session, enable the channel for all registered apps. | |
4473 | */ | |
35a9059d | 4474 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
4475 | struct ltt_ust_channel *uchan) |
4476 | { | |
4477 | int ret = 0; | |
bec39940 | 4478 | struct lttng_ht_iter iter; |
78f0bacd DG |
4479 | struct ust_app *app; |
4480 | struct ust_app_session *ua_sess; | |
4481 | ||
88e3c2f5 | 4482 | assert(usess->active); |
d9bf3ca4 | 4483 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 4484 | uchan->name, usess->id); |
78f0bacd DG |
4485 | |
4486 | rcu_read_lock(); | |
4487 | ||
4488 | /* For every registered applications */ | |
852d0037 | 4489 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4490 | if (!app->compatible) { |
4491 | /* | |
4492 | * TODO: In time, we should notice the caller of this error by | |
4493 | * telling him that this is a version error. | |
4494 | */ | |
4495 | continue; | |
4496 | } | |
78f0bacd DG |
4497 | ua_sess = lookup_session_by_app(usess, app); |
4498 | if (ua_sess == NULL) { | |
4499 | continue; | |
4500 | } | |
4501 | ||
4502 | /* Enable channel onto application */ | |
4503 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
4504 | if (ret < 0) { | |
4505 | /* XXX: We might want to report this error at some point... */ | |
4506 | continue; | |
4507 | } | |
4508 | } | |
4509 | ||
4510 | rcu_read_unlock(); | |
78f0bacd DG |
4511 | return ret; |
4512 | } | |
4513 | ||
b0a40d28 DG |
4514 | /* |
4515 | * Disable an event in a channel and for a specific session. | |
4516 | */ | |
35a9059d DG |
4517 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4518 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4519 | { |
4520 | int ret = 0; | |
bec39940 | 4521 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4522 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4523 | struct ust_app *app; |
4524 | struct ust_app_session *ua_sess; | |
4525 | struct ust_app_channel *ua_chan; | |
4526 | struct ust_app_event *ua_event; | |
4527 | ||
88e3c2f5 | 4528 | assert(usess->active); |
b0a40d28 | 4529 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4530 | "%s for session id %" PRIu64, |
4531 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4532 | |
4533 | rcu_read_lock(); | |
4534 | ||
4535 | /* For all registered applications */ | |
852d0037 | 4536 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4537 | if (!app->compatible) { |
4538 | /* | |
4539 | * TODO: In time, we should notice the caller of this error by | |
4540 | * telling him that this is a version error. | |
4541 | */ | |
4542 | continue; | |
4543 | } | |
b0a40d28 DG |
4544 | ua_sess = lookup_session_by_app(usess, app); |
4545 | if (ua_sess == NULL) { | |
4546 | /* Next app */ | |
4547 | continue; | |
4548 | } | |
4549 | ||
4550 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4551 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4552 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4553 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4554 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4555 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4556 | continue; |
4557 | } | |
4558 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4559 | ||
700c5a9d JR |
4560 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4561 | uevent->filter, uevent->attr.loglevel, | |
4562 | uevent->exclusion); | |
4563 | if (ua_event == NULL) { | |
b0a40d28 | 4564 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4565 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4566 | continue; |
4567 | } | |
b0a40d28 | 4568 | |
7f79d3a1 | 4569 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4570 | if (ret < 0) { |
4571 | /* XXX: Report error someday... */ | |
4572 | continue; | |
4573 | } | |
4574 | } | |
4575 | ||
4576 | rcu_read_unlock(); | |
88e3c2f5 JG |
4577 | return ret; |
4578 | } | |
4579 | ||
4580 | /* The ua_sess lock must be held by the caller. */ | |
4581 | static | |
4582 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4583 | struct ust_app_session *ua_sess, | |
4584 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4585 | struct ust_app_channel **_ua_chan) | |
4586 | { | |
4587 | int ret = 0; | |
4588 | struct ust_app_channel *ua_chan = NULL; | |
4589 | ||
4590 | assert(ua_sess); | |
4591 | ASSERT_LOCKED(ua_sess->lock); | |
4592 | ||
4593 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4594 | sizeof(uchan->name))) { | |
4595 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4596 | &uchan->attr); | |
4597 | ret = 0; | |
4598 | } else { | |
4599 | struct ltt_ust_context *uctx = NULL; | |
4600 | ||
4601 | /* | |
4602 | * Create channel onto application and synchronize its | |
4603 | * configuration. | |
4604 | */ | |
4605 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4606 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4607 | &ua_chan); | |
88ebf5a7 JR |
4608 | if (ret < 0) { |
4609 | goto error; | |
4610 | } | |
4611 | ||
4612 | ret = ust_app_channel_send(app, usess, | |
4613 | ua_sess, ua_chan); | |
4614 | if (ret) { | |
4615 | goto error; | |
88e3c2f5 JG |
4616 | } |
4617 | ||
4618 | /* Add contexts. */ | |
4619 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4620 | ret = create_ust_app_channel_context(ua_chan, | |
4621 | &uctx->ctx, app); | |
4622 | if (ret) { | |
88ebf5a7 | 4623 | goto error; |
88e3c2f5 JG |
4624 | } |
4625 | } | |
4626 | } | |
88ebf5a7 JR |
4627 | |
4628 | error: | |
88e3c2f5 JG |
4629 | if (ret < 0) { |
4630 | switch (ret) { | |
4631 | case -ENOTCONN: | |
4632 | /* | |
4633 | * The application's socket is not valid. Either a bad socket | |
4634 | * or a timeout on it. We can't inform the caller that for a | |
4635 | * specific app, the session failed so lets continue here. | |
4636 | */ | |
4637 | ret = 0; /* Not an error. */ | |
4638 | break; | |
4639 | case -ENOMEM: | |
4640 | default: | |
4641 | break; | |
4642 | } | |
4643 | } | |
88ebf5a7 | 4644 | |
88e3c2f5 JG |
4645 | if (ret == 0 && _ua_chan) { |
4646 | /* | |
4647 | * Only return the application's channel on success. Note | |
4648 | * that the channel can still be part of the application's | |
4649 | * channel hashtable on error. | |
4650 | */ | |
4651 | *_ua_chan = ua_chan; | |
4652 | } | |
b0a40d28 DG |
4653 | return ret; |
4654 | } | |
4655 | ||
5b4a0ec0 | 4656 | /* |
edb67388 | 4657 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4658 | */ |
35a9059d | 4659 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4660 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4661 | { | |
4662 | int ret = 0; | |
bec39940 | 4663 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4664 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4665 | struct ust_app *app; |
4666 | struct ust_app_session *ua_sess; | |
4667 | struct ust_app_channel *ua_chan; | |
4668 | struct ust_app_event *ua_event; | |
48842b30 | 4669 | |
88e3c2f5 | 4670 | assert(usess->active); |
d9bf3ca4 | 4671 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4672 | uevent->attr.name, usess->id); |
48842b30 | 4673 | |
edb67388 DG |
4674 | /* |
4675 | * NOTE: At this point, this function is called only if the session and | |
4676 | * channel passed are already created for all apps. and enabled on the | |
4677 | * tracer also. | |
4678 | */ | |
4679 | ||
48842b30 | 4680 | rcu_read_lock(); |
421cb601 DG |
4681 | |
4682 | /* For all registered applications */ | |
852d0037 | 4683 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4684 | if (!app->compatible) { |
4685 | /* | |
4686 | * TODO: In time, we should notice the caller of this error by | |
4687 | * telling him that this is a version error. | |
4688 | */ | |
4689 | continue; | |
4690 | } | |
edb67388 | 4691 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4692 | if (!ua_sess) { |
4693 | /* The application has problem or is probably dead. */ | |
4694 | continue; | |
4695 | } | |
ba767faf | 4696 | |
d0b96690 DG |
4697 | pthread_mutex_lock(&ua_sess->lock); |
4698 | ||
b161602a MD |
4699 | if (ua_sess->deleted) { |
4700 | pthread_mutex_unlock(&ua_sess->lock); | |
4701 | continue; | |
4702 | } | |
4703 | ||
edb67388 | 4704 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4705 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4706 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4707 | /* |
4708 | * It is possible that the channel cannot be found is | |
4709 | * the channel/event creation occurs concurrently with | |
4710 | * an application exit. | |
4711 | */ | |
4712 | if (!ua_chan_node) { | |
4713 | pthread_mutex_unlock(&ua_sess->lock); | |
4714 | continue; | |
4715 | } | |
edb67388 DG |
4716 | |
4717 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4718 | ||
18eace3b DG |
4719 | /* Get event node */ |
4720 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4721 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4722 | if (ua_event == NULL) { |
7f79d3a1 | 4723 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4724 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4725 | goto next_app; |
35a9059d | 4726 | } |
35a9059d DG |
4727 | |
4728 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4729 | if (ret < 0) { | |
d0b96690 | 4730 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4731 | goto error; |
48842b30 | 4732 | } |
d0b96690 DG |
4733 | next_app: |
4734 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4735 | } |
4736 | ||
7f79d3a1 | 4737 | error: |
edb67388 | 4738 | rcu_read_unlock(); |
edb67388 DG |
4739 | return ret; |
4740 | } | |
4741 | ||
4742 | /* | |
4743 | * For a specific existing UST session and UST channel, creates the event for | |
4744 | * all registered apps. | |
4745 | */ | |
35a9059d | 4746 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4747 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4748 | { | |
4749 | int ret = 0; | |
bec39940 DG |
4750 | struct lttng_ht_iter iter, uiter; |
4751 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4752 | struct ust_app *app; |
4753 | struct ust_app_session *ua_sess; | |
4754 | struct ust_app_channel *ua_chan; | |
4755 | ||
88e3c2f5 | 4756 | assert(usess->active); |
d9bf3ca4 | 4757 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4758 | uevent->attr.name, usess->id); |
edb67388 | 4759 | |
edb67388 DG |
4760 | rcu_read_lock(); |
4761 | ||
4762 | /* For all registered applications */ | |
852d0037 | 4763 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4764 | if (!app->compatible) { |
4765 | /* | |
4766 | * TODO: In time, we should notice the caller of this error by | |
4767 | * telling him that this is a version error. | |
4768 | */ | |
4769 | continue; | |
4770 | } | |
edb67388 | 4771 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4772 | if (!ua_sess) { |
4773 | /* The application has problem or is probably dead. */ | |
4774 | continue; | |
4775 | } | |
48842b30 | 4776 | |
d0b96690 | 4777 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4778 | |
4779 | if (ua_sess->deleted) { | |
4780 | pthread_mutex_unlock(&ua_sess->lock); | |
4781 | continue; | |
4782 | } | |
4783 | ||
48842b30 | 4784 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4785 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4786 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4787 | /* If the channel is not found, there is a code flow error */ |
4788 | assert(ua_chan_node); | |
4789 | ||
48842b30 DG |
4790 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4791 | ||
edb67388 | 4792 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4793 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4794 | if (ret < 0) { |
49c336c1 | 4795 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4796 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4797 | break; | |
4798 | } | |
4799 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4800 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4801 | continue; |
48842b30 | 4802 | } |
48842b30 | 4803 | } |
5b4a0ec0 | 4804 | |
48842b30 | 4805 | rcu_read_unlock(); |
48842b30 DG |
4806 | return ret; |
4807 | } | |
4808 | ||
5b4a0ec0 DG |
4809 | /* |
4810 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4811 | * |
4812 | * Called with UST app session lock held. | |
4813 | * | |
5b4a0ec0 | 4814 | */ |
b34cbebf | 4815 | static |
421cb601 | 4816 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4817 | { |
4818 | int ret = 0; | |
48842b30 | 4819 | struct ust_app_session *ua_sess; |
48842b30 | 4820 | |
852d0037 | 4821 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4822 | |
509cbaf8 MD |
4823 | rcu_read_lock(); |
4824 | ||
e0c7ec2b DG |
4825 | if (!app->compatible) { |
4826 | goto end; | |
4827 | } | |
4828 | ||
421cb601 DG |
4829 | ua_sess = lookup_session_by_app(usess, app); |
4830 | if (ua_sess == NULL) { | |
d42f20df DG |
4831 | /* The session is in teardown process. Ignore and continue. */ |
4832 | goto end; | |
421cb601 | 4833 | } |
48842b30 | 4834 | |
d0b96690 DG |
4835 | pthread_mutex_lock(&ua_sess->lock); |
4836 | ||
b161602a MD |
4837 | if (ua_sess->deleted) { |
4838 | pthread_mutex_unlock(&ua_sess->lock); | |
4839 | goto end; | |
4840 | } | |
4841 | ||
b0a1c741 JR |
4842 | if (ua_sess->enabled) { |
4843 | pthread_mutex_unlock(&ua_sess->lock); | |
4844 | goto end; | |
4845 | } | |
4846 | ||
aea829b3 DG |
4847 | /* Upon restart, we skip the setup, already done */ |
4848 | if (ua_sess->started) { | |
8be98f9a | 4849 | goto skip_setup; |
aea829b3 | 4850 | } |
8be98f9a | 4851 | |
840cb59c | 4852 | health_code_update(); |
86acf0da | 4853 | |
8be98f9a | 4854 | skip_setup: |
a945cdc7 | 4855 | /* This starts the UST tracing */ |
fb45065e | 4856 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4857 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4858 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4859 | if (ret < 0) { |
ffe60014 DG |
4860 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4861 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4862 | app->pid, ret); | |
4863 | } else { | |
4864 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4865 | /* |
4866 | * This is normal behavior, an application can die during the | |
4867 | * creation process. Don't report an error so the execution can | |
4868 | * continue normally. | |
4869 | */ | |
4870 | pthread_mutex_unlock(&ua_sess->lock); | |
4871 | goto end; | |
ffe60014 | 4872 | } |
d0b96690 | 4873 | goto error_unlock; |
421cb601 | 4874 | } |
5b4a0ec0 | 4875 | |
55c3953d DG |
4876 | /* Indicate that the session has been started once */ |
4877 | ua_sess->started = 1; | |
b0a1c741 | 4878 | ua_sess->enabled = 1; |
55c3953d | 4879 | |
d0b96690 DG |
4880 | pthread_mutex_unlock(&ua_sess->lock); |
4881 | ||
840cb59c | 4882 | health_code_update(); |
86acf0da | 4883 | |
421cb601 | 4884 | /* Quiescent wait after starting trace */ |
fb45065e | 4885 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4886 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4887 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4888 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4889 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4890 | app->pid, ret); | |
4891 | } | |
48842b30 | 4892 | |
e0c7ec2b DG |
4893 | end: |
4894 | rcu_read_unlock(); | |
840cb59c | 4895 | health_code_update(); |
421cb601 | 4896 | return 0; |
48842b30 | 4897 | |
d0b96690 DG |
4898 | error_unlock: |
4899 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4900 | rcu_read_unlock(); |
840cb59c | 4901 | health_code_update(); |
421cb601 DG |
4902 | return -1; |
4903 | } | |
48842b30 | 4904 | |
8be98f9a MD |
4905 | /* |
4906 | * Stop tracing for a specific UST session and app. | |
4907 | */ | |
b34cbebf | 4908 | static |
8be98f9a MD |
4909 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4910 | { | |
4911 | int ret = 0; | |
4912 | struct ust_app_session *ua_sess; | |
7972aab2 | 4913 | struct ust_registry_session *registry; |
8be98f9a | 4914 | |
852d0037 | 4915 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4916 | |
4917 | rcu_read_lock(); | |
4918 | ||
e0c7ec2b | 4919 | if (!app->compatible) { |
d88aee68 | 4920 | goto end_no_session; |
e0c7ec2b DG |
4921 | } |
4922 | ||
8be98f9a MD |
4923 | ua_sess = lookup_session_by_app(usess, app); |
4924 | if (ua_sess == NULL) { | |
d88aee68 | 4925 | goto end_no_session; |
8be98f9a MD |
4926 | } |
4927 | ||
d88aee68 DG |
4928 | pthread_mutex_lock(&ua_sess->lock); |
4929 | ||
b161602a MD |
4930 | if (ua_sess->deleted) { |
4931 | pthread_mutex_unlock(&ua_sess->lock); | |
4932 | goto end_no_session; | |
4933 | } | |
4934 | ||
9bc07046 DG |
4935 | /* |
4936 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4937 | * that was never started. It's possible since we can have a fail start |
4938 | * from either the application manager thread or the command thread. Simply | |
4939 | * indicate that this is a stop error. | |
9bc07046 | 4940 | */ |
f9dfc3d9 | 4941 | if (!ua_sess->started) { |
c45536e1 DG |
4942 | goto error_rcu_unlock; |
4943 | } | |
7db205b5 | 4944 | |
840cb59c | 4945 | health_code_update(); |
86acf0da | 4946 | |
9d6c7d3f | 4947 | /* This inhibits UST tracing */ |
fb45065e | 4948 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4949 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4950 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4951 | if (ret < 0) { |
ffe60014 DG |
4952 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4953 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4954 | app->pid, ret); | |
4955 | } else { | |
4956 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4957 | /* |
4958 | * This is normal behavior, an application can die during the | |
4959 | * creation process. Don't report an error so the execution can | |
4960 | * continue normally. | |
4961 | */ | |
4962 | goto end_unlock; | |
ffe60014 | 4963 | } |
9d6c7d3f DG |
4964 | goto error_rcu_unlock; |
4965 | } | |
4966 | ||
840cb59c | 4967 | health_code_update(); |
b0a1c741 | 4968 | ua_sess->enabled = 0; |
86acf0da | 4969 | |
9d6c7d3f | 4970 | /* Quiescent wait after stopping trace */ |
fb45065e | 4971 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4972 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4973 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4974 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4975 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4976 | app->pid, ret); | |
4977 | } | |
9d6c7d3f | 4978 | |
840cb59c | 4979 | health_code_update(); |
86acf0da | 4980 | |
b34cbebf | 4981 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4982 | |
4983 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4984 | assert(registry); |
1b532a60 | 4985 | |
ce34fcd0 MD |
4986 | /* Push metadata for application before freeing the application. */ |
4987 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4988 | |
3757b385 | 4989 | end_unlock: |
b34cbebf MD |
4990 | pthread_mutex_unlock(&ua_sess->lock); |
4991 | end_no_session: | |
4992 | rcu_read_unlock(); | |
4993 | health_code_update(); | |
4994 | return 0; | |
4995 | ||
4996 | error_rcu_unlock: | |
4997 | pthread_mutex_unlock(&ua_sess->lock); | |
4998 | rcu_read_unlock(); | |
4999 | health_code_update(); | |
5000 | return -1; | |
5001 | } | |
5002 | ||
b34cbebf | 5003 | static |
c4b88406 MD |
5004 | int ust_app_flush_app_session(struct ust_app *app, |
5005 | struct ust_app_session *ua_sess) | |
b34cbebf | 5006 | { |
c4b88406 | 5007 | int ret, retval = 0; |
b34cbebf | 5008 | struct lttng_ht_iter iter; |
b34cbebf | 5009 | struct ust_app_channel *ua_chan; |
c4b88406 | 5010 | struct consumer_socket *socket; |
b34cbebf | 5011 | |
c4b88406 | 5012 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
5013 | |
5014 | rcu_read_lock(); | |
5015 | ||
5016 | if (!app->compatible) { | |
c4b88406 | 5017 | goto end_not_compatible; |
b34cbebf MD |
5018 | } |
5019 | ||
5020 | pthread_mutex_lock(&ua_sess->lock); | |
5021 | ||
b161602a MD |
5022 | if (ua_sess->deleted) { |
5023 | goto end_deleted; | |
5024 | } | |
5025 | ||
b34cbebf MD |
5026 | health_code_update(); |
5027 | ||
9d6c7d3f | 5028 | /* Flushing buffers */ |
c4b88406 MD |
5029 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
5030 | ua_sess->consumer); | |
ce34fcd0 MD |
5031 | |
5032 | /* Flush buffers and push metadata. */ | |
5033 | switch (ua_sess->buffer_type) { | |
5034 | case LTTNG_BUFFER_PER_PID: | |
5035 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
5036 | node.node) { | |
5037 | health_code_update(); | |
ce34fcd0 MD |
5038 | ret = consumer_flush_channel(socket, ua_chan->key); |
5039 | if (ret) { | |
5040 | ERR("Error flushing consumer channel"); | |
5041 | retval = -1; | |
5042 | continue; | |
5043 | } | |
8be98f9a | 5044 | } |
ce34fcd0 MD |
5045 | break; |
5046 | case LTTNG_BUFFER_PER_UID: | |
5047 | default: | |
5048 | assert(0); | |
5049 | break; | |
8be98f9a | 5050 | } |
8be98f9a | 5051 | |
840cb59c | 5052 | health_code_update(); |
86acf0da | 5053 | |
b161602a | 5054 | end_deleted: |
d88aee68 | 5055 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 5056 | |
c4b88406 MD |
5057 | end_not_compatible: |
5058 | rcu_read_unlock(); | |
5059 | health_code_update(); | |
5060 | return retval; | |
5061 | } | |
5062 | ||
5063 | /* | |
ce34fcd0 MD |
5064 | * Flush buffers for all applications for a specific UST session. |
5065 | * Called with UST session lock held. | |
c4b88406 MD |
5066 | */ |
5067 | static | |
ce34fcd0 | 5068 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
5069 | |
5070 | { | |
99b1411c | 5071 | int ret = 0; |
c4b88406 | 5072 | |
ce34fcd0 | 5073 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
5074 | |
5075 | rcu_read_lock(); | |
5076 | ||
ce34fcd0 MD |
5077 | /* Flush buffers and push metadata. */ |
5078 | switch (usess->buffer_type) { | |
5079 | case LTTNG_BUFFER_PER_UID: | |
5080 | { | |
5081 | struct buffer_reg_uid *reg; | |
5082 | struct lttng_ht_iter iter; | |
5083 | ||
5084 | /* Flush all per UID buffers associated to that session. */ | |
5085 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5086 | struct ust_registry_session *ust_session_reg; | |
5087 | struct buffer_reg_channel *reg_chan; | |
5088 | struct consumer_socket *socket; | |
5089 | ||
5090 | /* Get consumer socket to use to push the metadata.*/ | |
5091 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5092 | usess->consumer); | |
5093 | if (!socket) { | |
5094 | /* Ignore request if no consumer is found for the session. */ | |
5095 | continue; | |
5096 | } | |
5097 | ||
5098 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5099 | reg_chan, node.node) { | |
5100 | /* | |
5101 | * The following call will print error values so the return | |
5102 | * code is of little importance because whatever happens, we | |
5103 | * have to try them all. | |
5104 | */ | |
5105 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
5106 | } | |
5107 | ||
5108 | ust_session_reg = reg->registry->reg.ust; | |
5109 | /* Push metadata. */ | |
5110 | (void) push_metadata(ust_session_reg, usess->consumer); | |
5111 | } | |
ce34fcd0 MD |
5112 | break; |
5113 | } | |
5114 | case LTTNG_BUFFER_PER_PID: | |
5115 | { | |
5116 | struct ust_app_session *ua_sess; | |
5117 | struct lttng_ht_iter iter; | |
5118 | struct ust_app *app; | |
5119 | ||
5120 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5121 | ua_sess = lookup_session_by_app(usess, app); | |
5122 | if (ua_sess == NULL) { | |
5123 | continue; | |
5124 | } | |
5125 | (void) ust_app_flush_app_session(app, ua_sess); | |
5126 | } | |
5127 | break; | |
5128 | } | |
5129 | default: | |
99b1411c | 5130 | ret = -1; |
ce34fcd0 MD |
5131 | assert(0); |
5132 | break; | |
c4b88406 | 5133 | } |
c4b88406 | 5134 | |
7db205b5 | 5135 | rcu_read_unlock(); |
840cb59c | 5136 | health_code_update(); |
c4b88406 | 5137 | return ret; |
8be98f9a MD |
5138 | } |
5139 | ||
0dd01979 MD |
5140 | static |
5141 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
5142 | struct ust_app_session *ua_sess) | |
5143 | { | |
5144 | int ret = 0; | |
5145 | struct lttng_ht_iter iter; | |
5146 | struct ust_app_channel *ua_chan; | |
5147 | struct consumer_socket *socket; | |
5148 | ||
5149 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
5150 | ||
5151 | rcu_read_lock(); | |
5152 | ||
5153 | if (!app->compatible) { | |
5154 | goto end_not_compatible; | |
5155 | } | |
5156 | ||
5157 | pthread_mutex_lock(&ua_sess->lock); | |
5158 | ||
5159 | if (ua_sess->deleted) { | |
5160 | goto end_unlock; | |
5161 | } | |
5162 | ||
5163 | health_code_update(); | |
5164 | ||
5165 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5166 | ua_sess->consumer); | |
5167 | if (!socket) { | |
5168 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
5169 | app->bits_per_long); | |
5170 | ret = -1; | |
5171 | goto end_unlock; | |
5172 | } | |
5173 | ||
5174 | /* Clear quiescent state. */ | |
5175 | switch (ua_sess->buffer_type) { | |
5176 | case LTTNG_BUFFER_PER_PID: | |
5177 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
5178 | ua_chan, node.node) { | |
5179 | health_code_update(); | |
5180 | ret = consumer_clear_quiescent_channel(socket, | |
5181 | ua_chan->key); | |
5182 | if (ret) { | |
5183 | ERR("Error clearing quiescent state for consumer channel"); | |
5184 | ret = -1; | |
5185 | continue; | |
5186 | } | |
5187 | } | |
5188 | break; | |
5189 | case LTTNG_BUFFER_PER_UID: | |
5190 | default: | |
5191 | assert(0); | |
5192 | ret = -1; | |
5193 | break; | |
5194 | } | |
5195 | ||
5196 | health_code_update(); | |
5197 | ||
5198 | end_unlock: | |
5199 | pthread_mutex_unlock(&ua_sess->lock); | |
5200 | ||
5201 | end_not_compatible: | |
5202 | rcu_read_unlock(); | |
5203 | health_code_update(); | |
5204 | return ret; | |
5205 | } | |
5206 | ||
5207 | /* | |
5208 | * Clear quiescent state in each stream for all applications for a | |
5209 | * specific UST session. | |
5210 | * Called with UST session lock held. | |
5211 | */ | |
5212 | static | |
5213 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
5214 | ||
5215 | { | |
5216 | int ret = 0; | |
5217 | ||
5218 | DBG("Clearing stream quiescent state for all ust apps"); | |
5219 | ||
5220 | rcu_read_lock(); | |
5221 | ||
5222 | switch (usess->buffer_type) { | |
5223 | case LTTNG_BUFFER_PER_UID: | |
5224 | { | |
5225 | struct lttng_ht_iter iter; | |
5226 | struct buffer_reg_uid *reg; | |
5227 | ||
5228 | /* | |
5229 | * Clear quiescent for all per UID buffers associated to | |
5230 | * that session. | |
5231 | */ | |
5232 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5233 | struct consumer_socket *socket; | |
5234 | struct buffer_reg_channel *reg_chan; | |
5235 | ||
5236 | /* Get associated consumer socket.*/ | |
5237 | socket = consumer_find_socket_by_bitness( | |
5238 | reg->bits_per_long, usess->consumer); | |
5239 | if (!socket) { | |
5240 | /* | |
5241 | * Ignore request if no consumer is found for | |
5242 | * the session. | |
5243 | */ | |
5244 | continue; | |
5245 | } | |
5246 | ||
5247 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
5248 | &iter.iter, reg_chan, node.node) { | |
5249 | /* | |
5250 | * The following call will print error values so | |
5251 | * the return code is of little importance | |
5252 | * because whatever happens, we have to try them | |
5253 | * all. | |
5254 | */ | |
5255 | (void) consumer_clear_quiescent_channel(socket, | |
5256 | reg_chan->consumer_key); | |
5257 | } | |
5258 | } | |
5259 | break; | |
5260 | } | |
5261 | case LTTNG_BUFFER_PER_PID: | |
5262 | { | |
5263 | struct ust_app_session *ua_sess; | |
5264 | struct lttng_ht_iter iter; | |
5265 | struct ust_app *app; | |
5266 | ||
5267 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
5268 | pid_n.node) { | |
5269 | ua_sess = lookup_session_by_app(usess, app); | |
5270 | if (ua_sess == NULL) { | |
5271 | continue; | |
5272 | } | |
5273 | (void) ust_app_clear_quiescent_app_session(app, | |
5274 | ua_sess); | |
5275 | } | |
5276 | break; | |
5277 | } | |
5278 | default: | |
5279 | ret = -1; | |
5280 | assert(0); | |
5281 | break; | |
5282 | } | |
5283 | ||
5284 | rcu_read_unlock(); | |
5285 | health_code_update(); | |
5286 | return ret; | |
5287 | } | |
5288 | ||
84cd17c6 MD |
5289 | /* |
5290 | * Destroy a specific UST session in apps. | |
5291 | */ | |
3353de95 | 5292 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 5293 | { |
ffe60014 | 5294 | int ret; |
84cd17c6 | 5295 | struct ust_app_session *ua_sess; |
bec39940 | 5296 | struct lttng_ht_iter iter; |
d9bf3ca4 | 5297 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 5298 | |
852d0037 | 5299 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
5300 | |
5301 | rcu_read_lock(); | |
5302 | ||
e0c7ec2b DG |
5303 | if (!app->compatible) { |
5304 | goto end; | |
5305 | } | |
5306 | ||
84cd17c6 | 5307 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 5308 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 5309 | if (node == NULL) { |
d42f20df DG |
5310 | /* Session is being or is deleted. */ |
5311 | goto end; | |
84cd17c6 MD |
5312 | } |
5313 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 5314 | |
840cb59c | 5315 | health_code_update(); |
d0b96690 | 5316 | destroy_app_session(app, ua_sess); |
84cd17c6 | 5317 | |
840cb59c | 5318 | health_code_update(); |
7db205b5 | 5319 | |
84cd17c6 | 5320 | /* Quiescent wait after stopping trace */ |
fb45065e | 5321 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 5322 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 5323 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
5324 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
5325 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
5326 | app->pid, ret); | |
5327 | } | |
e0c7ec2b DG |
5328 | end: |
5329 | rcu_read_unlock(); | |
840cb59c | 5330 | health_code_update(); |
84cd17c6 | 5331 | return 0; |
84cd17c6 MD |
5332 | } |
5333 | ||
5b4a0ec0 DG |
5334 | /* |
5335 | * Start tracing for the UST session. | |
5336 | */ | |
421cb601 DG |
5337 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
5338 | { | |
bec39940 | 5339 | struct lttng_ht_iter iter; |
421cb601 | 5340 | struct ust_app *app; |
48842b30 | 5341 | |
421cb601 DG |
5342 | DBG("Starting all UST traces"); |
5343 | ||
bb2452c8 MD |
5344 | /* |
5345 | * Even though the start trace might fail, flag this session active so | |
5346 | * other application coming in are started by default. | |
5347 | */ | |
5348 | usess->active = 1; | |
5349 | ||
421cb601 | 5350 | rcu_read_lock(); |
421cb601 | 5351 | |
0dd01979 MD |
5352 | /* |
5353 | * In a start-stop-start use-case, we need to clear the quiescent state | |
5354 | * of each channel set by the prior stop command, thus ensuring that a | |
5355 | * following stop or destroy is sure to grab a timestamp_end near those | |
5356 | * operations, even if the packet is empty. | |
5357 | */ | |
5358 | (void) ust_app_clear_quiescent_session(usess); | |
5359 | ||
0498a00c MD |
5360 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5361 | ust_app_global_update(usess, app); | |
5362 | } | |
5363 | ||
48842b30 DG |
5364 | rcu_read_unlock(); |
5365 | ||
5366 | return 0; | |
5367 | } | |
487cf67c | 5368 | |
8be98f9a MD |
5369 | /* |
5370 | * Start tracing for the UST session. | |
ce34fcd0 | 5371 | * Called with UST session lock held. |
8be98f9a MD |
5372 | */ |
5373 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
5374 | { | |
5375 | int ret = 0; | |
bec39940 | 5376 | struct lttng_ht_iter iter; |
8be98f9a MD |
5377 | struct ust_app *app; |
5378 | ||
5379 | DBG("Stopping all UST traces"); | |
5380 | ||
bb2452c8 MD |
5381 | /* |
5382 | * Even though the stop trace might fail, flag this session inactive so | |
5383 | * other application coming in are not started by default. | |
5384 | */ | |
5385 | usess->active = 0; | |
5386 | ||
8be98f9a MD |
5387 | rcu_read_lock(); |
5388 | ||
b34cbebf MD |
5389 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
5390 | ret = ust_app_stop_trace(usess, app); | |
5391 | if (ret < 0) { | |
5392 | /* Continue to next apps even on error */ | |
5393 | continue; | |
5394 | } | |
5395 | } | |
5396 | ||
ce34fcd0 | 5397 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
5398 | |
5399 | rcu_read_unlock(); | |
5400 | ||
5401 | return 0; | |
5402 | } | |
5403 | ||
84cd17c6 MD |
5404 | /* |
5405 | * Destroy app UST session. | |
5406 | */ | |
5407 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
5408 | { | |
5409 | int ret = 0; | |
bec39940 | 5410 | struct lttng_ht_iter iter; |
84cd17c6 MD |
5411 | struct ust_app *app; |
5412 | ||
5413 | DBG("Destroy all UST traces"); | |
5414 | ||
5415 | rcu_read_lock(); | |
5416 | ||
852d0037 | 5417 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 5418 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
5419 | if (ret < 0) { |
5420 | /* Continue to next apps even on error */ | |
5421 | continue; | |
5422 | } | |
5423 | } | |
5424 | ||
5425 | rcu_read_unlock(); | |
5426 | ||
5427 | return 0; | |
5428 | } | |
5429 | ||
88e3c2f5 | 5430 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 5431 | static |
88e3c2f5 JG |
5432 | int find_or_create_ust_app_channel( |
5433 | struct ltt_ust_session *usess, | |
5434 | struct ust_app_session *ua_sess, | |
5435 | struct ust_app *app, | |
5436 | struct ltt_ust_channel *uchan, | |
5437 | struct ust_app_channel **ua_chan) | |
487cf67c | 5438 | { |
55c54cce | 5439 | int ret = 0; |
88e3c2f5 JG |
5440 | struct lttng_ht_iter iter; |
5441 | struct lttng_ht_node_str *ua_chan_node; | |
5442 | ||
5443 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5444 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5445 | if (ua_chan_node) { | |
5446 | *ua_chan = caa_container_of(ua_chan_node, | |
5447 | struct ust_app_channel, node); | |
5448 | goto end; | |
5449 | } | |
5450 | ||
5451 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5452 | if (ret) { | |
5453 | goto end; | |
5454 | } | |
5455 | end: | |
5456 | return ret; | |
5457 | } | |
5458 | ||
5459 | static | |
5460 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5461 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5462 | struct ust_app *app) | |
5463 | { | |
5464 | int ret = 0; | |
5465 | struct ust_app_event *ua_event = NULL; | |
5466 | ||
5467 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5468 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5469 | if (!ua_event) { | |
5470 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5471 | if (ret < 0) { | |
5472 | goto end; | |
5473 | } | |
5474 | } else { | |
5475 | if (ua_event->enabled != uevent->enabled) { | |
5476 | ret = uevent->enabled ? | |
5477 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5478 | disable_ust_app_event(ua_sess, ua_event, app); | |
5479 | } | |
5480 | } | |
5481 | ||
5482 | end: | |
5483 | return ret; | |
5484 | } | |
5485 | ||
993578ff JR |
5486 | /* Called with RCU read-side lock held. */ |
5487 | static | |
5488 | void ust_app_synchronize_event_notifier_rules(struct ust_app *app) | |
5489 | { | |
5490 | int ret = 0; | |
5491 | enum lttng_error_code ret_code; | |
5492 | enum lttng_trigger_status t_status; | |
5493 | struct lttng_ht_iter app_trigger_iter; | |
5494 | struct lttng_triggers *triggers = NULL; | |
5495 | struct ust_app_event_notifier_rule *event_notifier_rule; | |
5496 | unsigned int count, i; | |
5497 | ||
5498 | /* | |
5499 | * Currrently, registering or unregistering a trigger with an | |
5500 | * event rule condition causes a full synchronization of the event | |
5501 | * notifiers. | |
5502 | * | |
5503 | * The first step attempts to add an event notifier for all registered | |
5504 | * triggers that apply to the user space tracers. Then, the | |
5505 | * application's event notifiers rules are all checked against the list | |
5506 | * of registered triggers. Any event notifier that doesn't have a | |
5507 | * matching trigger can be assumed to have been disabled. | |
5508 | * | |
5509 | * All of this is inefficient, but is put in place to get the feature | |
5510 | * rolling as it is simpler at this moment. It will be optimized Soon™ | |
5511 | * to allow the state of enabled | |
5512 | * event notifiers to be synchronized in a piece-wise way. | |
5513 | */ | |
5514 | ||
5515 | /* Get all triggers using uid 0 (root) */ | |
5516 | ret_code = notification_thread_command_list_triggers( | |
5517 | notification_thread_handle, 0, &triggers); | |
5518 | if (ret_code != LTTNG_OK) { | |
5519 | ret = -1; | |
5520 | goto end; | |
5521 | } | |
5522 | ||
5523 | assert(triggers); | |
5524 | ||
5525 | t_status = lttng_triggers_get_count(triggers, &count); | |
5526 | if (t_status != LTTNG_TRIGGER_STATUS_OK) { | |
5527 | ret = -1; | |
5528 | goto end; | |
5529 | } | |
5530 | ||
5531 | for (i = 0; i < count; i++) { | |
5532 | struct lttng_condition *condition; | |
5533 | struct lttng_event_rule *event_rule; | |
5534 | struct lttng_trigger *trigger; | |
5535 | const struct ust_app_event_notifier_rule *looked_up_event_notifier_rule; | |
5536 | enum lttng_condition_status condition_status; | |
5537 | uint64_t token; | |
5538 | ||
5539 | trigger = lttng_triggers_borrow_mutable_at_index(triggers, i); | |
5540 | assert(trigger); | |
5541 | ||
5542 | token = lttng_trigger_get_tracer_token(trigger); | |
5543 | condition = lttng_trigger_get_condition(trigger); | |
5544 | ||
5545 | if (lttng_condition_get_type(condition) != LTTNG_CONDITION_TYPE_EVENT_RULE_HIT) { | |
5546 | /* Does not apply */ | |
5547 | continue; | |
5548 | } | |
5549 | ||
5550 | condition_status = lttng_condition_event_rule_borrow_rule_mutable(condition, &event_rule); | |
5551 | assert(condition_status == LTTNG_CONDITION_STATUS_OK); | |
5552 | ||
5553 | if (lttng_event_rule_get_domain_type(event_rule) == LTTNG_DOMAIN_KERNEL) { | |
5554 | /* Skip kernel related triggers. */ | |
5555 | continue; | |
5556 | } | |
5557 | ||
5558 | /* | |
5559 | * Find or create the associated token event rule. The caller | |
5560 | * holds the RCU read lock, so this is safe to call without | |
5561 | * explicitly acquiring it here. | |
5562 | */ | |
5563 | looked_up_event_notifier_rule = find_ust_app_event_notifier_rule( | |
5564 | app->token_to_event_notifier_rule_ht, token); | |
5565 | if (!looked_up_event_notifier_rule) { | |
5566 | ret = create_ust_app_event_notifier_rule(event_rule, app, token); | |
5567 | if (ret < 0) { | |
5568 | goto end; | |
5569 | } | |
5570 | } | |
5571 | } | |
5572 | ||
5573 | rcu_read_lock(); | |
5574 | /* Remove all unknown event sources from the app. */ | |
5575 | cds_lfht_for_each_entry (app->token_to_event_notifier_rule_ht->ht, | |
5576 | &app_trigger_iter.iter, event_notifier_rule, | |
5577 | node.node) { | |
5578 | const uint64_t app_token = event_notifier_rule->token; | |
5579 | bool found = false; | |
5580 | ||
5581 | /* | |
5582 | * Check if the app event trigger still exists on the | |
5583 | * notification side. | |
5584 | */ | |
5585 | for (i = 0; i < count; i++) { | |
5586 | uint64_t notification_thread_token; | |
5587 | const struct lttng_trigger *trigger = | |
5588 | lttng_triggers_get_at_index( | |
5589 | triggers, i); | |
5590 | ||
5591 | assert(trigger); | |
5592 | ||
5593 | notification_thread_token = | |
5594 | lttng_trigger_get_tracer_token(trigger); | |
5595 | ||
5596 | if (notification_thread_token == app_token) { | |
5597 | found = true; | |
5598 | break; | |
5599 | } | |
5600 | } | |
5601 | ||
5602 | if (found) { | |
5603 | /* Still valid. */ | |
5604 | continue; | |
5605 | } | |
5606 | ||
5607 | /* | |
5608 | * This trigger was unregistered, disable it on the tracer's | |
5609 | * side. | |
5610 | */ | |
5611 | ret = lttng_ht_del(app->token_to_event_notifier_rule_ht, | |
5612 | &app_trigger_iter); | |
5613 | assert(ret == 0); | |
5614 | ||
5615 | /* Callee logs errors. */ | |
5616 | (void) disable_ust_object(app, event_notifier_rule->obj); | |
5617 | ||
5618 | delete_ust_app_event_notifier_rule( | |
5619 | app->sock, event_notifier_rule, app); | |
5620 | } | |
5621 | ||
5622 | rcu_read_unlock(); | |
5623 | ||
5624 | end: | |
5625 | lttng_triggers_destroy(triggers); | |
5626 | return; | |
5627 | } | |
5628 | ||
88e3c2f5 JG |
5629 | /* |
5630 | * The caller must ensure that the application is compatible and is tracked | |
2a3a1a2b | 5631 | * by the process attribute trackers. |
88e3c2f5 JG |
5632 | */ |
5633 | static | |
5634 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5635 | struct ust_app *app) | |
5636 | { | |
5637 | int ret = 0; | |
5638 | struct cds_lfht_iter uchan_iter; | |
5639 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5640 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5641 | |
88e3c2f5 JG |
5642 | /* |
5643 | * The application's configuration should only be synchronized for | |
5644 | * active sessions. | |
5645 | */ | |
5646 | assert(usess->active); | |
5647 | ||
5648 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5649 | if (ret < 0) { |
5650 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5651 | goto error; |
5652 | } | |
3d8ca23b | 5653 | assert(ua_sess); |
487cf67c | 5654 | |
d0b96690 | 5655 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5656 | if (ua_sess->deleted) { |
5657 | pthread_mutex_unlock(&ua_sess->lock); | |
5658 | goto end; | |
5659 | } | |
5660 | ||
88e3c2f5 | 5661 | rcu_read_lock(); |
ef67c072 | 5662 | |
88e3c2f5 JG |
5663 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, |
5664 | uchan, node.node) { | |
5665 | struct ust_app_channel *ua_chan; | |
5666 | struct cds_lfht_iter uevent_iter; | |
5667 | struct ltt_ust_event *uevent; | |
487cf67c | 5668 | |
31746f93 | 5669 | /* |
88e3c2f5 JG |
5670 | * Search for a matching ust_app_channel. If none is found, |
5671 | * create it. Creating the channel will cause the ua_chan | |
5672 | * structure to be allocated, the channel buffers to be | |
5673 | * allocated (if necessary) and sent to the application, and | |
5674 | * all enabled contexts will be added to the channel. | |
31746f93 | 5675 | */ |
f3db82be | 5676 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
88e3c2f5 JG |
5677 | app, uchan, &ua_chan); |
5678 | if (ret) { | |
5679 | /* Tracer is probably gone or ENOMEM. */ | |
5680 | goto error_unlock; | |
727d5404 DG |
5681 | } |
5682 | ||
88e3c2f5 JG |
5683 | if (!ua_chan) { |
5684 | /* ua_chan will be NULL for the metadata channel */ | |
5685 | continue; | |
5686 | } | |
727d5404 | 5687 | |
88e3c2f5 | 5688 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5689 | node.node) { |
88e3c2f5 JG |
5690 | ret = ust_app_channel_synchronize_event(ua_chan, |
5691 | uevent, ua_sess, app); | |
5692 | if (ret) { | |
d0b96690 | 5693 | goto error_unlock; |
487cf67c | 5694 | } |
36dc12cc | 5695 | } |
d0b96690 | 5696 | |
88e3c2f5 JG |
5697 | if (ua_chan->enabled != uchan->enabled) { |
5698 | ret = uchan->enabled ? | |
5699 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5700 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5701 | if (ret) { | |
5702 | goto error_unlock; | |
5703 | } | |
5704 | } | |
36dc12cc | 5705 | } |
ef67c072 JG |
5706 | |
5707 | /* | |
5708 | * Create the metadata for the application. This returns gracefully if a | |
5709 | * metadata was already set for the session. | |
5710 | * | |
5711 | * The metadata channel must be created after the data channels as the | |
5712 | * consumer daemon assumes this ordering. When interacting with a relay | |
5713 | * daemon, the consumer will use this assumption to send the | |
5714 | * "STREAMS_SENT" message to the relay daemon. | |
5715 | */ | |
5716 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); | |
5717 | if (ret < 0) { | |
5718 | goto error_unlock; | |
5719 | } | |
5720 | ||
88e3c2f5 | 5721 | rcu_read_unlock(); |
0498a00c | 5722 | |
a9ad0c8f | 5723 | end: |
88e3c2f5 | 5724 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5725 | /* Everything went well at this point. */ |
ffe60014 DG |
5726 | return; |
5727 | ||
d0b96690 | 5728 | error_unlock: |
88e3c2f5 | 5729 | rcu_read_unlock(); |
d0b96690 | 5730 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5731 | error: |
ffe60014 | 5732 | if (ua_sess) { |
d0b96690 | 5733 | destroy_app_session(app, ua_sess); |
ffe60014 | 5734 | } |
487cf67c DG |
5735 | return; |
5736 | } | |
55cc08a6 | 5737 | |
a9ad0c8f MD |
5738 | static |
5739 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5740 | { | |
5741 | struct ust_app_session *ua_sess; | |
5742 | ||
5743 | ua_sess = lookup_session_by_app(usess, app); | |
5744 | if (ua_sess == NULL) { | |
5745 | return; | |
5746 | } | |
5747 | destroy_app_session(app, ua_sess); | |
5748 | } | |
5749 | ||
5750 | /* | |
5751 | * Add channels/events from UST global domain to registered apps at sock. | |
5752 | * | |
5753 | * Called with session lock held. | |
5754 | * Called with RCU read-side lock held. | |
5755 | */ | |
5756 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5757 | { | |
5758 | assert(usess); | |
88e3c2f5 | 5759 | assert(usess->active); |
a9ad0c8f MD |
5760 | |
5761 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5762 | app->sock, usess->id); | |
5763 | ||
5764 | if (!app->compatible) { | |
5765 | return; | |
5766 | } | |
159b042f JG |
5767 | if (trace_ust_id_tracker_lookup(LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID, |
5768 | usess, app->pid) && | |
55c9e7ca | 5769 | trace_ust_id_tracker_lookup( |
159b042f JG |
5770 | LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID, |
5771 | usess, app->uid) && | |
55c9e7ca | 5772 | trace_ust_id_tracker_lookup( |
159b042f JG |
5773 | LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID, |
5774 | usess, app->gid)) { | |
88e3c2f5 JG |
5775 | /* |
5776 | * Synchronize the application's internal tracing configuration | |
5777 | * and start tracing. | |
5778 | */ | |
5779 | ust_app_synchronize(usess, app); | |
5780 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5781 | } else { |
5782 | ust_app_global_destroy(usess, app); | |
5783 | } | |
5784 | } | |
5785 | ||
993578ff JR |
5786 | /* |
5787 | * Add all event notifiers to an application. | |
5788 | * | |
5789 | * Called with session lock held. | |
5790 | * Called with RCU read-side lock held. | |
5791 | */ | |
5792 | void ust_app_global_update_event_notifier_rules(struct ust_app *app) | |
5793 | { | |
5794 | DBG2("UST application global event notifier rules update: app = '%s' (ppid: %d)", | |
5795 | app->name, app->ppid); | |
5796 | ||
5797 | if (!app->compatible) { | |
5798 | return; | |
5799 | } | |
5800 | ||
5801 | if (app->event_notifier_group.object == NULL) { | |
5802 | WARN("UST app global update of event notifiers for app skipped since communication handle is null: app = '%s' (ppid: %d)", | |
5803 | app->name, app->ppid); | |
5804 | return; | |
5805 | } | |
5806 | ||
5807 | ust_app_synchronize_event_notifier_rules(app); | |
5808 | } | |
5809 | ||
a9ad0c8f MD |
5810 | /* |
5811 | * Called with session lock held. | |
5812 | */ | |
5813 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5814 | { | |
5815 | struct lttng_ht_iter iter; | |
5816 | struct ust_app *app; | |
5817 | ||
5818 | rcu_read_lock(); | |
5819 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5820 | ust_app_global_update(usess, app); | |
5821 | } | |
5822 | rcu_read_unlock(); | |
5823 | } | |
5824 | ||
993578ff JR |
5825 | void ust_app_global_update_all_event_notifier_rules(void) |
5826 | { | |
5827 | struct lttng_ht_iter iter; | |
5828 | struct ust_app *app; | |
5829 | ||
5830 | rcu_read_lock(); | |
5831 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5832 | ust_app_global_update_event_notifier_rules(app); | |
5833 | } | |
5834 | ||
5835 | rcu_read_unlock(); | |
5836 | } | |
5837 | ||
55cc08a6 DG |
5838 | /* |
5839 | * Add context to a specific channel for global UST domain. | |
5840 | */ | |
5841 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5842 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5843 | { | |
5844 | int ret = 0; | |
bec39940 DG |
5845 | struct lttng_ht_node_str *ua_chan_node; |
5846 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5847 | struct ust_app_channel *ua_chan = NULL; |
5848 | struct ust_app_session *ua_sess; | |
5849 | struct ust_app *app; | |
5850 | ||
88e3c2f5 | 5851 | assert(usess->active); |
0498a00c | 5852 | |
55cc08a6 | 5853 | rcu_read_lock(); |
852d0037 | 5854 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5855 | if (!app->compatible) { |
5856 | /* | |
5857 | * TODO: In time, we should notice the caller of this error by | |
5858 | * telling him that this is a version error. | |
5859 | */ | |
5860 | continue; | |
5861 | } | |
55cc08a6 DG |
5862 | ua_sess = lookup_session_by_app(usess, app); |
5863 | if (ua_sess == NULL) { | |
5864 | continue; | |
5865 | } | |
5866 | ||
d0b96690 | 5867 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5868 | |
5869 | if (ua_sess->deleted) { | |
5870 | pthread_mutex_unlock(&ua_sess->lock); | |
5871 | continue; | |
5872 | } | |
5873 | ||
55cc08a6 | 5874 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5875 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5876 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5877 | if (ua_chan_node == NULL) { |
d0b96690 | 5878 | goto next_app; |
55cc08a6 DG |
5879 | } |
5880 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5881 | node); | |
c9edf082 | 5882 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5883 | if (ret < 0) { |
d0b96690 | 5884 | goto next_app; |
55cc08a6 | 5885 | } |
d0b96690 DG |
5886 | next_app: |
5887 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5888 | } |
5889 | ||
55cc08a6 | 5890 | rcu_read_unlock(); |
76d45b40 DG |
5891 | return ret; |
5892 | } | |
7f79d3a1 | 5893 | |
d0b96690 DG |
5894 | /* |
5895 | * Receive registration and populate the given msg structure. | |
5896 | * | |
5897 | * On success return 0 else a negative value returned by the ustctl call. | |
5898 | */ | |
5899 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5900 | { | |
5901 | int ret; | |
5902 | uint32_t pid, ppid, uid, gid; | |
5903 | ||
5904 | assert(msg); | |
5905 | ||
5906 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5907 | &pid, &ppid, &uid, &gid, | |
5908 | &msg->bits_per_long, | |
5909 | &msg->uint8_t_alignment, | |
5910 | &msg->uint16_t_alignment, | |
5911 | &msg->uint32_t_alignment, | |
5912 | &msg->uint64_t_alignment, | |
5913 | &msg->long_alignment, | |
5914 | &msg->byte_order, | |
5915 | msg->name); | |
5916 | if (ret < 0) { | |
5917 | switch (-ret) { | |
5918 | case EPIPE: | |
5919 | case ECONNRESET: | |
5920 | case LTTNG_UST_ERR_EXITING: | |
5921 | DBG3("UST app recv reg message failed. Application died"); | |
5922 | break; | |
5923 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5924 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5925 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5926 | LTTNG_UST_ABI_MINOR_VERSION); | |
5927 | break; | |
5928 | default: | |
5929 | ERR("UST app recv reg message failed with ret %d", ret); | |
5930 | break; | |
5931 | } | |
5932 | goto error; | |
5933 | } | |
5934 | msg->pid = (pid_t) pid; | |
5935 | msg->ppid = (pid_t) ppid; | |
5936 | msg->uid = (uid_t) uid; | |
5937 | msg->gid = (gid_t) gid; | |
5938 | ||
5939 | error: | |
5940 | return ret; | |
5941 | } | |
5942 | ||
10b56aef MD |
5943 | /* |
5944 | * Return a ust app session object using the application object and the | |
5945 | * session object descriptor has a key. If not found, NULL is returned. | |
5946 | * A RCU read side lock MUST be acquired when calling this function. | |
5947 | */ | |
5948 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5949 | int objd) | |
5950 | { | |
5951 | struct lttng_ht_node_ulong *node; | |
5952 | struct lttng_ht_iter iter; | |
5953 | struct ust_app_session *ua_sess = NULL; | |
5954 | ||
5955 | assert(app); | |
5956 | ||
5957 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5958 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5959 | if (node == NULL) { | |
5960 | DBG2("UST app session find by objd %d not found", objd); | |
5961 | goto error; | |
5962 | } | |
5963 | ||
5964 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5965 | ||
5966 | error: | |
5967 | return ua_sess; | |
5968 | } | |
5969 | ||
d88aee68 DG |
5970 | /* |
5971 | * Return a ust app channel object using the application object and the channel | |
5972 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5973 | * lock MUST be acquired before calling this function. | |
5974 | */ | |
d0b96690 DG |
5975 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5976 | int objd) | |
5977 | { | |
5978 | struct lttng_ht_node_ulong *node; | |
5979 | struct lttng_ht_iter iter; | |
5980 | struct ust_app_channel *ua_chan = NULL; | |
5981 | ||
5982 | assert(app); | |
5983 | ||
5984 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5985 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5986 | if (node == NULL) { | |
5987 | DBG2("UST app channel find by objd %d not found", objd); | |
5988 | goto error; | |
5989 | } | |
5990 | ||
5991 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5992 | ||
5993 | error: | |
5994 | return ua_chan; | |
5995 | } | |
5996 | ||
d88aee68 DG |
5997 | /* |
5998 | * Reply to a register channel notification from an application on the notify | |
5999 | * socket. The channel metadata is also created. | |
6000 | * | |
6001 | * The session UST registry lock is acquired in this function. | |
6002 | * | |
6003 | * On success 0 is returned else a negative value. | |
6004 | */ | |
8eede835 | 6005 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
6006 | size_t nr_fields, struct ustctl_field *fields) |
6007 | { | |
6008 | int ret, ret_code = 0; | |
294e218e | 6009 | uint32_t chan_id; |
7972aab2 | 6010 | uint64_t chan_reg_key; |
d0b96690 DG |
6011 | enum ustctl_channel_header type; |
6012 | struct ust_app *app; | |
6013 | struct ust_app_channel *ua_chan; | |
6014 | struct ust_app_session *ua_sess; | |
7972aab2 | 6015 | struct ust_registry_session *registry; |
45893984 | 6016 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
6017 | |
6018 | rcu_read_lock(); | |
6019 | ||
6020 | /* Lookup application. If not found, there is a code flow error. */ | |
6021 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6022 | if (!app) { |
fad1ed2f | 6023 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6024 | sock); |
6025 | ret = 0; | |
6026 | goto error_rcu_unlock; | |
6027 | } | |
d0b96690 | 6028 | |
4950b860 | 6029 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6030 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6031 | if (!ua_chan) { |
fad1ed2f | 6032 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6033 | ret = 0; |
6034 | goto error_rcu_unlock; | |
6035 | } | |
6036 | ||
d0b96690 DG |
6037 | assert(ua_chan->session); |
6038 | ua_sess = ua_chan->session; | |
d0b96690 | 6039 | |
7972aab2 DG |
6040 | /* Get right session registry depending on the session buffer type. */ |
6041 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6042 | if (!registry) { |
6043 | DBG("Application session is being torn down. Abort event notify"); | |
6044 | ret = 0; | |
6045 | goto error_rcu_unlock; | |
6046 | }; | |
45893984 | 6047 | |
7972aab2 DG |
6048 | /* Depending on the buffer type, a different channel key is used. */ |
6049 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6050 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 6051 | } else { |
7972aab2 | 6052 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
6053 | } |
6054 | ||
7972aab2 DG |
6055 | pthread_mutex_lock(®istry->lock); |
6056 | ||
6057 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
6058 | assert(chan_reg); | |
6059 | ||
6060 | if (!chan_reg->register_done) { | |
294e218e MD |
6061 | /* |
6062 | * TODO: eventually use the registry event count for | |
6063 | * this channel to better guess header type for per-pid | |
6064 | * buffers. | |
6065 | */ | |
6066 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
6067 | chan_reg->nr_ctx_fields = nr_fields; |
6068 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 6069 | fields = NULL; |
7972aab2 | 6070 | chan_reg->header_type = type; |
d0b96690 | 6071 | } else { |
7972aab2 DG |
6072 | /* Get current already assigned values. */ |
6073 | type = chan_reg->header_type; | |
d0b96690 | 6074 | } |
7972aab2 DG |
6075 | /* Channel id is set during the object creation. */ |
6076 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
6077 | |
6078 | /* Append to metadata */ | |
7972aab2 DG |
6079 | if (!chan_reg->metadata_dumped) { |
6080 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
6081 | if (ret_code) { |
6082 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
6083 | goto reply; | |
6084 | } | |
6085 | } | |
6086 | ||
6087 | reply: | |
7972aab2 DG |
6088 | DBG3("UST app replying to register channel key %" PRIu64 |
6089 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
6090 | ret_code); | |
d0b96690 DG |
6091 | |
6092 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
6093 | if (ret < 0) { | |
6094 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6095 | ERR("UST app reply channel failed with ret %d", ret); | |
6096 | } else { | |
6097 | DBG3("UST app reply channel failed. Application died"); | |
6098 | } | |
6099 | goto error; | |
6100 | } | |
6101 | ||
7972aab2 DG |
6102 | /* This channel registry registration is completed. */ |
6103 | chan_reg->register_done = 1; | |
6104 | ||
d0b96690 | 6105 | error: |
7972aab2 | 6106 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6107 | error_rcu_unlock: |
d0b96690 | 6108 | rcu_read_unlock(); |
fad1ed2f | 6109 | free(fields); |
d0b96690 DG |
6110 | return ret; |
6111 | } | |
6112 | ||
d88aee68 DG |
6113 | /* |
6114 | * Add event to the UST channel registry. When the event is added to the | |
6115 | * registry, the metadata is also created. Once done, this replies to the | |
6116 | * application with the appropriate error code. | |
6117 | * | |
6118 | * The session UST registry lock is acquired in the function. | |
6119 | * | |
6120 | * On success 0 is returned else a negative value. | |
6121 | */ | |
d0b96690 | 6122 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
6123 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
6124 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
6125 | { |
6126 | int ret, ret_code; | |
6127 | uint32_t event_id = 0; | |
7972aab2 | 6128 | uint64_t chan_reg_key; |
d0b96690 DG |
6129 | struct ust_app *app; |
6130 | struct ust_app_channel *ua_chan; | |
6131 | struct ust_app_session *ua_sess; | |
7972aab2 | 6132 | struct ust_registry_session *registry; |
d0b96690 DG |
6133 | |
6134 | rcu_read_lock(); | |
6135 | ||
6136 | /* Lookup application. If not found, there is a code flow error. */ | |
6137 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 6138 | if (!app) { |
fad1ed2f | 6139 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
6140 | sock); |
6141 | ret = 0; | |
6142 | goto error_rcu_unlock; | |
6143 | } | |
d0b96690 | 6144 | |
4950b860 | 6145 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 6146 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 6147 | if (!ua_chan) { |
fad1ed2f | 6148 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
6149 | ret = 0; |
6150 | goto error_rcu_unlock; | |
6151 | } | |
6152 | ||
d0b96690 DG |
6153 | assert(ua_chan->session); |
6154 | ua_sess = ua_chan->session; | |
6155 | ||
7972aab2 | 6156 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
6157 | if (!registry) { |
6158 | DBG("Application session is being torn down. Abort event notify"); | |
6159 | ret = 0; | |
6160 | goto error_rcu_unlock; | |
6161 | } | |
7972aab2 DG |
6162 | |
6163 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
6164 | chan_reg_key = ua_chan->tracing_channel_id; | |
6165 | } else { | |
6166 | chan_reg_key = ua_chan->key; | |
6167 | } | |
6168 | ||
6169 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 6170 | |
d5d629b5 DG |
6171 | /* |
6172 | * From this point on, this call acquires the ownership of the sig, fields | |
6173 | * and model_emf_uri meaning any free are done inside it if needed. These | |
6174 | * three variables MUST NOT be read/write after this. | |
6175 | */ | |
7972aab2 | 6176 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
6177 | sobjd, cobjd, name, sig, nr_fields, fields, |
6178 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
6179 | &event_id, app); | |
fad1ed2f JR |
6180 | sig = NULL; |
6181 | fields = NULL; | |
6182 | model_emf_uri = NULL; | |
d0b96690 DG |
6183 | |
6184 | /* | |
6185 | * The return value is returned to ustctl so in case of an error, the | |
6186 | * application can be notified. In case of an error, it's important not to | |
6187 | * return a negative error or else the application will get closed. | |
6188 | */ | |
6189 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
6190 | if (ret < 0) { | |
6191 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6192 | ERR("UST app reply event failed with ret %d", ret); | |
6193 | } else { | |
6194 | DBG3("UST app reply event failed. Application died"); | |
6195 | } | |
6196 | /* | |
6197 | * No need to wipe the create event since the application socket will | |
6198 | * get close on error hence cleaning up everything by itself. | |
6199 | */ | |
6200 | goto error; | |
6201 | } | |
6202 | ||
7972aab2 DG |
6203 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
6204 | name, event_id); | |
d88aee68 | 6205 | |
d0b96690 | 6206 | error: |
7972aab2 | 6207 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 6208 | error_rcu_unlock: |
d0b96690 | 6209 | rcu_read_unlock(); |
fad1ed2f JR |
6210 | free(sig); |
6211 | free(fields); | |
6212 | free(model_emf_uri); | |
d0b96690 DG |
6213 | return ret; |
6214 | } | |
6215 | ||
10b56aef MD |
6216 | /* |
6217 | * Add enum to the UST session registry. Once done, this replies to the | |
6218 | * application with the appropriate error code. | |
6219 | * | |
6220 | * The session UST registry lock is acquired within this function. | |
6221 | * | |
6222 | * On success 0 is returned else a negative value. | |
6223 | */ | |
6224 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
6225 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
6226 | { | |
6227 | int ret = 0, ret_code; | |
6228 | struct ust_app *app; | |
6229 | struct ust_app_session *ua_sess; | |
6230 | struct ust_registry_session *registry; | |
6231 | uint64_t enum_id = -1ULL; | |
6232 | ||
6233 | rcu_read_lock(); | |
6234 | ||
6235 | /* Lookup application. If not found, there is a code flow error. */ | |
6236 | app = find_app_by_notify_sock(sock); | |
6237 | if (!app) { | |
6238 | /* Return an error since this is not an error */ | |
6239 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
6240 | sock); | |
6241 | free(entries); | |
6242 | goto error_rcu_unlock; | |
6243 | } | |
6244 | ||
6245 | /* Lookup session by UST object descriptor. */ | |
6246 | ua_sess = find_session_by_objd(app, sobjd); | |
6247 | if (!ua_sess) { | |
6248 | /* Return an error since this is not an error */ | |
fad1ed2f | 6249 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
6250 | free(entries); |
6251 | goto error_rcu_unlock; | |
6252 | } | |
6253 | ||
6254 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
6255 | if (!registry) { |
6256 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
6257 | free(entries); | |
6258 | goto error_rcu_unlock; | |
6259 | } | |
10b56aef MD |
6260 | |
6261 | pthread_mutex_lock(®istry->lock); | |
6262 | ||
6263 | /* | |
6264 | * From this point on, the callee acquires the ownership of | |
6265 | * entries. The variable entries MUST NOT be read/written after | |
6266 | * call. | |
6267 | */ | |
6268 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
6269 | entries, nr_entries, &enum_id); | |
6270 | entries = NULL; | |
6271 | ||
6272 | /* | |
6273 | * The return value is returned to ustctl so in case of an error, the | |
6274 | * application can be notified. In case of an error, it's important not to | |
6275 | * return a negative error or else the application will get closed. | |
6276 | */ | |
6277 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
6278 | if (ret < 0) { | |
6279 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6280 | ERR("UST app reply enum failed with ret %d", ret); | |
6281 | } else { | |
6282 | DBG3("UST app reply enum failed. Application died"); | |
6283 | } | |
6284 | /* | |
6285 | * No need to wipe the create enum since the application socket will | |
6286 | * get close on error hence cleaning up everything by itself. | |
6287 | */ | |
6288 | goto error; | |
6289 | } | |
6290 | ||
6291 | DBG3("UST registry enum %s added successfully or already found", name); | |
6292 | ||
6293 | error: | |
6294 | pthread_mutex_unlock(®istry->lock); | |
6295 | error_rcu_unlock: | |
6296 | rcu_read_unlock(); | |
6297 | return ret; | |
6298 | } | |
6299 | ||
d88aee68 DG |
6300 | /* |
6301 | * Handle application notification through the given notify socket. | |
6302 | * | |
6303 | * Return 0 on success or else a negative value. | |
6304 | */ | |
d0b96690 DG |
6305 | int ust_app_recv_notify(int sock) |
6306 | { | |
6307 | int ret; | |
6308 | enum ustctl_notify_cmd cmd; | |
6309 | ||
6310 | DBG3("UST app receiving notify from sock %d", sock); | |
6311 | ||
6312 | ret = ustctl_recv_notify(sock, &cmd); | |
6313 | if (ret < 0) { | |
6314 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6315 | ERR("UST app recv notify failed with ret %d", ret); | |
6316 | } else { | |
6317 | DBG3("UST app recv notify failed. Application died"); | |
6318 | } | |
6319 | goto error; | |
6320 | } | |
6321 | ||
6322 | switch (cmd) { | |
6323 | case USTCTL_NOTIFY_CMD_EVENT: | |
6324 | { | |
2106efa0 | 6325 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
6326 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
6327 | size_t nr_fields; | |
6328 | struct ustctl_field *fields; | |
6329 | ||
6330 | DBG2("UST app ustctl register event received"); | |
6331 | ||
2106efa0 PP |
6332 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
6333 | &loglevel_value, &sig, &nr_fields, &fields, | |
6334 | &model_emf_uri); | |
d0b96690 DG |
6335 | if (ret < 0) { |
6336 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6337 | ERR("UST app recv event failed with ret %d", ret); | |
6338 | } else { | |
6339 | DBG3("UST app recv event failed. Application died"); | |
6340 | } | |
6341 | goto error; | |
6342 | } | |
6343 | ||
d5d629b5 DG |
6344 | /* |
6345 | * Add event to the UST registry coming from the notify socket. This | |
6346 | * call will free if needed the sig, fields and model_emf_uri. This | |
6347 | * code path loses the ownsership of these variables and transfer them | |
6348 | * to the this function. | |
6349 | */ | |
d0b96690 | 6350 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 6351 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
6352 | if (ret < 0) { |
6353 | goto error; | |
6354 | } | |
6355 | ||
6356 | break; | |
6357 | } | |
6358 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
6359 | { | |
6360 | int sobjd, cobjd; | |
6361 | size_t nr_fields; | |
6362 | struct ustctl_field *fields; | |
6363 | ||
6364 | DBG2("UST app ustctl register channel received"); | |
6365 | ||
6366 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
6367 | &fields); | |
6368 | if (ret < 0) { | |
6369 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6370 | ERR("UST app recv channel failed with ret %d", ret); | |
6371 | } else { | |
6372 | DBG3("UST app recv channel failed. Application died"); | |
6373 | } | |
6374 | goto error; | |
6375 | } | |
6376 | ||
d5d629b5 DG |
6377 | /* |
6378 | * The fields ownership are transfered to this function call meaning | |
6379 | * that if needed it will be freed. After this, it's invalid to access | |
6380 | * fields or clean it up. | |
6381 | */ | |
8eede835 | 6382 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
6383 | fields); |
6384 | if (ret < 0) { | |
6385 | goto error; | |
6386 | } | |
6387 | ||
6388 | break; | |
6389 | } | |
10b56aef MD |
6390 | case USTCTL_NOTIFY_CMD_ENUM: |
6391 | { | |
6392 | int sobjd; | |
6393 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
6394 | size_t nr_entries; | |
6395 | struct ustctl_enum_entry *entries; | |
6396 | ||
6397 | DBG2("UST app ustctl register enum received"); | |
6398 | ||
6399 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
6400 | &entries, &nr_entries); | |
6401 | if (ret < 0) { | |
6402 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
6403 | ERR("UST app recv enum failed with ret %d", ret); | |
6404 | } else { | |
6405 | DBG3("UST app recv enum failed. Application died"); | |
6406 | } | |
6407 | goto error; | |
6408 | } | |
6409 | ||
6410 | /* Callee assumes ownership of entries */ | |
6411 | ret = add_enum_ust_registry(sock, sobjd, name, | |
6412 | entries, nr_entries); | |
6413 | if (ret < 0) { | |
6414 | goto error; | |
6415 | } | |
6416 | ||
6417 | break; | |
6418 | } | |
d0b96690 DG |
6419 | default: |
6420 | /* Should NEVER happen. */ | |
6421 | assert(0); | |
6422 | } | |
6423 | ||
6424 | error: | |
6425 | return ret; | |
6426 | } | |
d88aee68 DG |
6427 | |
6428 | /* | |
6429 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
6430 | * corresponding application. On failure, the call_rcu to close the socket is | |
6431 | * executed. If an application is found, it tries to delete it from the notify | |
6432 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
6433 | * | |
6434 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
6435 | * call RCU is not done but the rest of the cleanup is. | |
6436 | */ | |
6437 | void ust_app_notify_sock_unregister(int sock) | |
6438 | { | |
6439 | int err_enomem = 0; | |
6440 | struct lttng_ht_iter iter; | |
6441 | struct ust_app *app; | |
6442 | struct ust_app_notify_sock_obj *obj; | |
6443 | ||
6444 | assert(sock >= 0); | |
6445 | ||
6446 | rcu_read_lock(); | |
6447 | ||
6448 | obj = zmalloc(sizeof(*obj)); | |
6449 | if (!obj) { | |
6450 | /* | |
6451 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
6452 | * procedure but the call_rcu will not be called. In this case, we | |
6453 | * accept the fd leak rather than possibly creating an unsynchronized | |
6454 | * state between threads. | |
6455 | * | |
6456 | * TODO: The notify object should be created once the notify socket is | |
6457 | * registered and stored independantely from the ust app object. The | |
6458 | * tricky part is to synchronize the teardown of the application and | |
6459 | * this notify object. Let's keep that in mind so we can avoid this | |
6460 | * kind of shenanigans with ENOMEM in the teardown path. | |
6461 | */ | |
6462 | err_enomem = 1; | |
6463 | } else { | |
6464 | obj->fd = sock; | |
6465 | } | |
6466 | ||
6467 | DBG("UST app notify socket unregister %d", sock); | |
6468 | ||
6469 | /* | |
6470 | * Lookup application by notify socket. If this fails, this means that the | |
6471 | * hash table delete has already been done by the application | |
6472 | * unregistration process so we can safely close the notify socket in a | |
6473 | * call RCU. | |
6474 | */ | |
6475 | app = find_app_by_notify_sock(sock); | |
6476 | if (!app) { | |
6477 | goto close_socket; | |
6478 | } | |
6479 | ||
6480 | iter.iter.node = &app->notify_sock_n.node; | |
6481 | ||
6482 | /* | |
6483 | * Whatever happens here either we fail or succeed, in both cases we have | |
6484 | * to close the socket after a grace period to continue to the call RCU | |
6485 | * here. If the deletion is successful, the application is not visible | |
6486 | * anymore by other threads and is it fails it means that it was already | |
6487 | * deleted from the hash table so either way we just have to close the | |
6488 | * socket. | |
6489 | */ | |
6490 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
6491 | ||
6492 | close_socket: | |
6493 | rcu_read_unlock(); | |
6494 | ||
6495 | /* | |
6496 | * Close socket after a grace period to avoid for the socket to be reused | |
6497 | * before the application object is freed creating potential race between | |
6498 | * threads trying to add unique in the global hash table. | |
6499 | */ | |
6500 | if (!err_enomem) { | |
6501 | call_rcu(&obj->head, close_notify_sock_rcu); | |
6502 | } | |
6503 | } | |
f45e313d DG |
6504 | |
6505 | /* | |
6506 | * Destroy a ust app data structure and free its memory. | |
6507 | */ | |
6508 | void ust_app_destroy(struct ust_app *app) | |
6509 | { | |
6510 | if (!app) { | |
6511 | return; | |
6512 | } | |
6513 | ||
6514 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
6515 | } | |
6dc3064a DG |
6516 | |
6517 | /* | |
6518 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
6519 | * output. | |
6520 | * | |
9a654598 | 6521 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 6522 | */ |
fb9a95c4 JG |
6523 | enum lttng_error_code ust_app_snapshot_record( |
6524 | const struct ltt_ust_session *usess, | |
348a81dc | 6525 | const struct consumer_output *output, int wait, |
d07ceecd | 6526 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
6527 | { |
6528 | int ret = 0; | |
9a654598 | 6529 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
6530 | struct lttng_ht_iter iter; |
6531 | struct ust_app *app; | |
affce97e | 6532 | char *trace_path = NULL; |
6dc3064a DG |
6533 | |
6534 | assert(usess); | |
6535 | assert(output); | |
6536 | ||
6537 | rcu_read_lock(); | |
6538 | ||
8c924c7b MD |
6539 | switch (usess->buffer_type) { |
6540 | case LTTNG_BUFFER_PER_UID: | |
6541 | { | |
6542 | struct buffer_reg_uid *reg; | |
6dc3064a | 6543 | |
8c924c7b MD |
6544 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
6545 | struct buffer_reg_channel *reg_chan; | |
6546 | struct consumer_socket *socket; | |
3b967712 | 6547 | char pathname[PATH_MAX]; |
5da88b0f | 6548 | size_t consumer_path_offset = 0; |
6dc3064a | 6549 | |
2b269489 JR |
6550 | if (!reg->registry->reg.ust->metadata_key) { |
6551 | /* Skip since no metadata is present */ | |
6552 | continue; | |
6553 | } | |
6554 | ||
8c924c7b MD |
6555 | /* Get consumer socket to use to push the metadata.*/ |
6556 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6557 | usess->consumer); | |
6558 | if (!socket) { | |
9a654598 | 6559 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6560 | goto error; |
6561 | } | |
6dc3064a | 6562 | |
8c924c7b MD |
6563 | memset(pathname, 0, sizeof(pathname)); |
6564 | ret = snprintf(pathname, sizeof(pathname), | |
5da88b0f | 6565 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
6566 | reg->uid, reg->bits_per_long); |
6567 | if (ret < 0) { | |
6568 | PERROR("snprintf snapshot path"); | |
9a654598 | 6569 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
6570 | goto error; |
6571 | } | |
affce97e JG |
6572 | /* Free path allowed on previous iteration. */ |
6573 | free(trace_path); | |
5da88b0f MD |
6574 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6575 | &consumer_path_offset); | |
3b967712 MD |
6576 | if (!trace_path) { |
6577 | status = LTTNG_ERR_INVALID; | |
6578 | goto error; | |
6579 | } | |
f3db82be | 6580 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
6581 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6582 | reg_chan, node.node) { | |
9a654598 | 6583 | status = consumer_snapshot_channel(socket, |
e098433c JG |
6584 | reg_chan->consumer_key, |
6585 | output, 0, usess->uid, | |
5da88b0f | 6586 | usess->gid, &trace_path[consumer_path_offset], wait, |
d2956687 | 6587 | nb_packets_per_stream); |
9a654598 | 6588 | if (status != LTTNG_OK) { |
8c924c7b MD |
6589 | goto error; |
6590 | } | |
6591 | } | |
9a654598 | 6592 | status = consumer_snapshot_channel(socket, |
68808f4e | 6593 | reg->registry->reg.ust->metadata_key, output, 1, |
5da88b0f MD |
6594 | usess->uid, usess->gid, &trace_path[consumer_path_offset], |
6595 | wait, 0); | |
9a654598 | 6596 | if (status != LTTNG_OK) { |
8c924c7b MD |
6597 | goto error; |
6598 | } | |
af706bb7 | 6599 | } |
8c924c7b MD |
6600 | break; |
6601 | } | |
6602 | case LTTNG_BUFFER_PER_PID: | |
6603 | { | |
6604 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6605 | struct consumer_socket *socket; | |
6606 | struct lttng_ht_iter chan_iter; | |
6607 | struct ust_app_channel *ua_chan; | |
6608 | struct ust_app_session *ua_sess; | |
6609 | struct ust_registry_session *registry; | |
3b967712 | 6610 | char pathname[PATH_MAX]; |
5da88b0f | 6611 | size_t consumer_path_offset = 0; |
8c924c7b MD |
6612 | |
6613 | ua_sess = lookup_session_by_app(usess, app); | |
6614 | if (!ua_sess) { | |
6615 | /* Session not associated with this app. */ | |
6616 | continue; | |
6617 | } | |
af706bb7 | 6618 | |
8c924c7b MD |
6619 | /* Get the right consumer socket for the application. */ |
6620 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 6621 | output); |
8c924c7b | 6622 | if (!socket) { |
9a654598 | 6623 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
6624 | goto error; |
6625 | } | |
6626 | ||
8c924c7b MD |
6627 | /* Add the UST default trace dir to path. */ |
6628 | memset(pathname, 0, sizeof(pathname)); | |
5da88b0f | 6629 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", |
8c924c7b | 6630 | ua_sess->path); |
6dc3064a | 6631 | if (ret < 0) { |
9a654598 | 6632 | status = LTTNG_ERR_INVALID; |
8c924c7b | 6633 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
6634 | goto error; |
6635 | } | |
affce97e JG |
6636 | /* Free path allowed on previous iteration. */ |
6637 | free(trace_path); | |
5da88b0f MD |
6638 | trace_path = setup_channel_trace_path(usess->consumer, pathname, |
6639 | &consumer_path_offset); | |
3b967712 MD |
6640 | if (!trace_path) { |
6641 | status = LTTNG_ERR_INVALID; | |
6642 | goto error; | |
6643 | } | |
f3db82be | 6644 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 6645 | ua_chan, node.node) { |
9a654598 | 6646 | status = consumer_snapshot_channel(socket, |
470cc211 | 6647 | ua_chan->key, output, 0, |
ff588497 JR |
6648 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6649 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6650 | &trace_path[consumer_path_offset], wait, |
d2956687 | 6651 | nb_packets_per_stream); |
9a654598 JG |
6652 | switch (status) { |
6653 | case LTTNG_OK: | |
6654 | break; | |
6655 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6656 | continue; | |
6657 | default: | |
8c924c7b MD |
6658 | goto error; |
6659 | } | |
6660 | } | |
6661 | ||
6662 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6663 | if (!registry) { |
9bbfb88c MD |
6664 | DBG("Application session is being torn down. Skip application."); |
6665 | continue; | |
fad1ed2f | 6666 | } |
9a654598 | 6667 | status = consumer_snapshot_channel(socket, |
470cc211 | 6668 | registry->metadata_key, output, 1, |
ff588497 JR |
6669 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
6670 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
5da88b0f | 6671 | &trace_path[consumer_path_offset], wait, 0); |
9a654598 JG |
6672 | switch (status) { |
6673 | case LTTNG_OK: | |
6674 | break; | |
6675 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6676 | continue; | |
6677 | default: | |
8c924c7b MD |
6678 | goto error; |
6679 | } | |
6680 | } | |
6681 | break; | |
6682 | } | |
6683 | default: | |
6684 | assert(0); | |
6685 | break; | |
6dc3064a DG |
6686 | } |
6687 | ||
6688 | error: | |
affce97e | 6689 | free(trace_path); |
6dc3064a | 6690 | rcu_read_unlock(); |
9a654598 | 6691 | return status; |
6dc3064a | 6692 | } |
5c786ded JD |
6693 | |
6694 | /* | |
d07ceecd | 6695 | * Return the size taken by one more packet per stream. |
5c786ded | 6696 | */ |
fb9a95c4 JG |
6697 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6698 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6699 | { |
d07ceecd | 6700 | uint64_t tot_size = 0; |
5c786ded JD |
6701 | struct ust_app *app; |
6702 | struct lttng_ht_iter iter; | |
6703 | ||
6704 | assert(usess); | |
6705 | ||
6706 | switch (usess->buffer_type) { | |
6707 | case LTTNG_BUFFER_PER_UID: | |
6708 | { | |
6709 | struct buffer_reg_uid *reg; | |
6710 | ||
6711 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6712 | struct buffer_reg_channel *reg_chan; | |
6713 | ||
b7064eaa | 6714 | rcu_read_lock(); |
5c786ded JD |
6715 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6716 | reg_chan, node.node) { | |
d07ceecd MD |
6717 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6718 | /* | |
6719 | * Don't take channel into account if we | |
6720 | * already grab all its packets. | |
6721 | */ | |
6722 | continue; | |
6723 | } | |
6724 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6725 | } |
b7064eaa | 6726 | rcu_read_unlock(); |
5c786ded JD |
6727 | } |
6728 | break; | |
6729 | } | |
6730 | case LTTNG_BUFFER_PER_PID: | |
6731 | { | |
6732 | rcu_read_lock(); | |
6733 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6734 | struct ust_app_channel *ua_chan; | |
6735 | struct ust_app_session *ua_sess; | |
6736 | struct lttng_ht_iter chan_iter; | |
6737 | ||
6738 | ua_sess = lookup_session_by_app(usess, app); | |
6739 | if (!ua_sess) { | |
6740 | /* Session not associated with this app. */ | |
6741 | continue; | |
6742 | } | |
6743 | ||
6744 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6745 | ua_chan, node.node) { | |
d07ceecd MD |
6746 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6747 | /* | |
6748 | * Don't take channel into account if we | |
6749 | * already grab all its packets. | |
6750 | */ | |
6751 | continue; | |
6752 | } | |
6753 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6754 | } |
6755 | } | |
6756 | rcu_read_unlock(); | |
6757 | break; | |
6758 | } | |
6759 | default: | |
6760 | assert(0); | |
6761 | break; | |
6762 | } | |
6763 | ||
d07ceecd | 6764 | return tot_size; |
5c786ded | 6765 | } |
fb83fe64 JD |
6766 | |
6767 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6768 | struct cds_list_head *buffer_reg_uid_list, | |
6769 | struct consumer_output *consumer, uint64_t uchan_id, | |
6770 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6771 | { | |
6772 | int ret; | |
6773 | uint64_t consumer_chan_key; | |
6774 | ||
70dd8162 MD |
6775 | *discarded = 0; |
6776 | *lost = 0; | |
6777 | ||
fb83fe64 | 6778 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6779 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6780 | if (ret < 0) { |
70dd8162 MD |
6781 | /* Not found */ |
6782 | ret = 0; | |
fb83fe64 JD |
6783 | goto end; |
6784 | } | |
6785 | ||
6786 | if (overwrite) { | |
6787 | ret = consumer_get_lost_packets(ust_session_id, | |
6788 | consumer_chan_key, consumer, lost); | |
6789 | } else { | |
6790 | ret = consumer_get_discarded_events(ust_session_id, | |
6791 | consumer_chan_key, consumer, discarded); | |
6792 | } | |
6793 | ||
6794 | end: | |
6795 | return ret; | |
6796 | } | |
6797 | ||
6798 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6799 | struct ltt_ust_channel *uchan, | |
6800 | struct consumer_output *consumer, int overwrite, | |
6801 | uint64_t *discarded, uint64_t *lost) | |
6802 | { | |
6803 | int ret = 0; | |
6804 | struct lttng_ht_iter iter; | |
6805 | struct lttng_ht_node_str *ua_chan_node; | |
6806 | struct ust_app *app; | |
6807 | struct ust_app_session *ua_sess; | |
6808 | struct ust_app_channel *ua_chan; | |
6809 | ||
70dd8162 MD |
6810 | *discarded = 0; |
6811 | *lost = 0; | |
6812 | ||
fb83fe64 JD |
6813 | rcu_read_lock(); |
6814 | /* | |
70dd8162 MD |
6815 | * Iterate over every registered applications. Sum counters for |
6816 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6817 | */ |
6818 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6819 | struct lttng_ht_iter uiter; | |
6820 | ||
6821 | ua_sess = lookup_session_by_app(usess, app); | |
6822 | if (ua_sess == NULL) { | |
6823 | continue; | |
6824 | } | |
6825 | ||
6826 | /* Get channel */ | |
ee022399 | 6827 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6828 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6829 | /* If the session is found for the app, the channel must be there */ | |
6830 | assert(ua_chan_node); | |
6831 | ||
6832 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6833 | ||
6834 | if (overwrite) { | |
70dd8162 MD |
6835 | uint64_t _lost; |
6836 | ||
fb83fe64 | 6837 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6838 | consumer, &_lost); |
6839 | if (ret < 0) { | |
6840 | break; | |
6841 | } | |
6842 | (*lost) += _lost; | |
fb83fe64 | 6843 | } else { |
70dd8162 MD |
6844 | uint64_t _discarded; |
6845 | ||
fb83fe64 | 6846 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6847 | ua_chan->key, consumer, &_discarded); |
6848 | if (ret < 0) { | |
6849 | break; | |
6850 | } | |
6851 | (*discarded) += _discarded; | |
fb83fe64 | 6852 | } |
fb83fe64 JD |
6853 | } |
6854 | ||
fb83fe64 JD |
6855 | rcu_read_unlock(); |
6856 | return ret; | |
6857 | } | |
c2561365 JD |
6858 | |
6859 | static | |
6860 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6861 | struct ust_app *app) | |
6862 | { | |
6863 | int ret = 0; | |
6864 | struct ust_app_session *ua_sess; | |
6865 | ||
6866 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6867 | ||
6868 | rcu_read_lock(); | |
6869 | ||
6870 | ua_sess = lookup_session_by_app(usess, app); | |
6871 | if (ua_sess == NULL) { | |
6872 | /* The session is in teardown process. Ignore and continue. */ | |
6873 | goto end; | |
6874 | } | |
6875 | ||
6876 | pthread_mutex_lock(&ua_sess->lock); | |
6877 | ||
6878 | if (ua_sess->deleted) { | |
6879 | goto end_unlock; | |
6880 | } | |
6881 | ||
6882 | pthread_mutex_lock(&app->sock_lock); | |
6883 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6884 | pthread_mutex_unlock(&app->sock_lock); | |
6885 | ||
6886 | end_unlock: | |
6887 | pthread_mutex_unlock(&ua_sess->lock); | |
6888 | ||
6889 | end: | |
6890 | rcu_read_unlock(); | |
6891 | health_code_update(); | |
6892 | return ret; | |
6893 | } | |
6894 | ||
6895 | /* | |
6896 | * Regenerate the statedump for each app in the session. | |
6897 | */ | |
6898 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6899 | { | |
6900 | int ret = 0; | |
6901 | struct lttng_ht_iter iter; | |
6902 | struct ust_app *app; | |
6903 | ||
6904 | DBG("Regenerating the metadata for all UST apps"); | |
6905 | ||
6906 | rcu_read_lock(); | |
6907 | ||
6908 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6909 | if (!app->compatible) { | |
6910 | continue; | |
6911 | } | |
6912 | ||
6913 | ret = ust_app_regenerate_statedump(usess, app); | |
6914 | if (ret < 0) { | |
6915 | /* Continue to the next app even on error */ | |
6916 | continue; | |
6917 | } | |
6918 | } | |
6919 | ||
6920 | rcu_read_unlock(); | |
6921 | ||
6922 | return 0; | |
6923 | } | |
5c408ad8 JD |
6924 | |
6925 | /* | |
6926 | * Rotate all the channels of a session. | |
6927 | * | |
6f6d3b69 | 6928 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6929 | */ |
6f6d3b69 | 6930 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6931 | { |
6f6d3b69 MD |
6932 | int ret; |
6933 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6934 | struct lttng_ht_iter iter; |
6935 | struct ust_app *app; | |
6936 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6937 | |
6938 | assert(usess); | |
6939 | ||
6940 | rcu_read_lock(); | |
6941 | ||
6942 | switch (usess->buffer_type) { | |
6943 | case LTTNG_BUFFER_PER_UID: | |
6944 | { | |
6945 | struct buffer_reg_uid *reg; | |
6946 | ||
6947 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6948 | struct buffer_reg_channel *reg_chan; | |
6949 | struct consumer_socket *socket; | |
6950 | ||
14d3fca9 JR |
6951 | if (!reg->registry->reg.ust->metadata_key) { |
6952 | /* Skip since no metadata is present */ | |
6953 | continue; | |
6954 | } | |
6955 | ||
5c408ad8 JD |
6956 | /* Get consumer socket to use to push the metadata.*/ |
6957 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6958 | usess->consumer); | |
6959 | if (!socket) { | |
6f6d3b69 | 6960 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6961 | goto error; |
6962 | } | |
6963 | ||
5c408ad8 JD |
6964 | /* Rotate the data channels. */ |
6965 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6966 | reg_chan, node.node) { | |
5c408ad8 JD |
6967 | ret = consumer_rotate_channel(socket, |
6968 | reg_chan->consumer_key, | |
6969 | usess->uid, usess->gid, | |
d2956687 JG |
6970 | usess->consumer, |
6971 | /* is_metadata_channel */ false); | |
5c408ad8 | 6972 | if (ret < 0) { |
6f6d3b69 | 6973 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6974 | goto error; |
6975 | } | |
6976 | } | |
6977 | ||
6978 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6979 | ||
6980 | ret = consumer_rotate_channel(socket, | |
6981 | reg->registry->reg.ust->metadata_key, | |
6982 | usess->uid, usess->gid, | |
d2956687 JG |
6983 | usess->consumer, |
6984 | /* is_metadata_channel */ true); | |
5c408ad8 | 6985 | if (ret < 0) { |
6f6d3b69 | 6986 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6987 | goto error; |
6988 | } | |
5c408ad8 JD |
6989 | } |
6990 | break; | |
6991 | } | |
6992 | case LTTNG_BUFFER_PER_PID: | |
6993 | { | |
6994 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6995 | struct consumer_socket *socket; | |
6996 | struct lttng_ht_iter chan_iter; | |
6997 | struct ust_app_channel *ua_chan; | |
6998 | struct ust_app_session *ua_sess; | |
6999 | struct ust_registry_session *registry; | |
7000 | ||
7001 | ua_sess = lookup_session_by_app(usess, app); | |
7002 | if (!ua_sess) { | |
7003 | /* Session not associated with this app. */ | |
7004 | continue; | |
7005 | } | |
5c408ad8 JD |
7006 | |
7007 | /* Get the right consumer socket for the application. */ | |
7008 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7009 | usess->consumer); | |
7010 | if (!socket) { | |
6f6d3b69 | 7011 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
7012 | goto error; |
7013 | } | |
7014 | ||
7015 | registry = get_session_registry(ua_sess); | |
7016 | if (!registry) { | |
6f6d3b69 MD |
7017 | DBG("Application session is being torn down. Skip application."); |
7018 | continue; | |
5c408ad8 JD |
7019 | } |
7020 | ||
5c408ad8 JD |
7021 | /* Rotate the data channels. */ |
7022 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7023 | ua_chan, node.node) { | |
470cc211 JG |
7024 | ret = consumer_rotate_channel(socket, |
7025 | ua_chan->key, | |
ff588497 JR |
7026 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7027 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7028 | ua_sess->consumer, |
7029 | /* is_metadata_channel */ false); | |
5c408ad8 | 7030 | if (ret < 0) { |
6f6d3b69 MD |
7031 | /* Per-PID buffer and application going away. */ |
7032 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7033 | continue; | |
7034 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7035 | goto error; |
7036 | } | |
7037 | } | |
7038 | ||
7039 | /* Rotate the metadata channel. */ | |
7040 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
7041 | ret = consumer_rotate_channel(socket, |
7042 | registry->metadata_key, | |
ff588497 JR |
7043 | lttng_credentials_get_uid(&ua_sess->effective_credentials), |
7044 | lttng_credentials_get_gid(&ua_sess->effective_credentials), | |
d2956687 JG |
7045 | ua_sess->consumer, |
7046 | /* is_metadata_channel */ true); | |
5c408ad8 | 7047 | if (ret < 0) { |
6f6d3b69 MD |
7048 | /* Per-PID buffer and application going away. */ |
7049 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
7050 | continue; | |
7051 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
7052 | goto error; |
7053 | } | |
5c408ad8 JD |
7054 | } |
7055 | break; | |
7056 | } | |
7057 | default: | |
7058 | assert(0); | |
7059 | break; | |
7060 | } | |
7061 | ||
6f6d3b69 | 7062 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
7063 | |
7064 | error: | |
7065 | rcu_read_unlock(); | |
6f6d3b69 | 7066 | return cmd_ret; |
5c408ad8 | 7067 | } |
d2956687 JG |
7068 | |
7069 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
7070 | const struct ltt_ust_session *usess) | |
7071 | { | |
7072 | enum lttng_error_code ret = LTTNG_OK; | |
7073 | struct lttng_ht_iter iter; | |
7074 | enum lttng_trace_chunk_status chunk_status; | |
7075 | char *pathname_index; | |
7076 | int fmt_ret; | |
7077 | ||
7078 | assert(usess->current_trace_chunk); | |
7079 | rcu_read_lock(); | |
7080 | ||
7081 | switch (usess->buffer_type) { | |
7082 | case LTTNG_BUFFER_PER_UID: | |
7083 | { | |
7084 | struct buffer_reg_uid *reg; | |
7085 | ||
7086 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7087 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7088 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7089 | reg->uid, reg->bits_per_long); |
7090 | if (fmt_ret < 0) { | |
7091 | ERR("Failed to format channel index directory"); | |
7092 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7093 | goto error; | |
7094 | } | |
7095 | ||
7096 | /* | |
7097 | * Create the index subdirectory which will take care | |
7098 | * of implicitly creating the channel's path. | |
7099 | */ | |
7100 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7101 | usess->current_trace_chunk, | |
7102 | pathname_index); | |
7103 | free(pathname_index); | |
7104 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7105 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7106 | goto error; | |
7107 | } | |
7108 | } | |
7109 | break; | |
7110 | } | |
7111 | case LTTNG_BUFFER_PER_PID: | |
7112 | { | |
7113 | struct ust_app *app; | |
7114 | ||
495dece5 MD |
7115 | /* |
7116 | * Create the toplevel ust/ directory in case no apps are running. | |
7117 | */ | |
7118 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7119 | usess->current_trace_chunk, | |
7120 | DEFAULT_UST_TRACE_DIR); | |
7121 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7122 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7123 | goto error; | |
7124 | } | |
7125 | ||
d2956687 JG |
7126 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, |
7127 | pid_n.node) { | |
7128 | struct ust_app_session *ua_sess; | |
7129 | struct ust_registry_session *registry; | |
7130 | ||
7131 | ua_sess = lookup_session_by_app(usess, app); | |
7132 | if (!ua_sess) { | |
7133 | /* Session not associated with this app. */ | |
7134 | continue; | |
7135 | } | |
7136 | ||
7137 | registry = get_session_registry(ua_sess); | |
7138 | if (!registry) { | |
7139 | DBG("Application session is being torn down. Skip application."); | |
7140 | continue; | |
7141 | } | |
7142 | ||
7143 | fmt_ret = asprintf(&pathname_index, | |
5da88b0f | 7144 | DEFAULT_UST_TRACE_DIR "/%s/" DEFAULT_INDEX_DIR, |
d2956687 JG |
7145 | ua_sess->path); |
7146 | if (fmt_ret < 0) { | |
7147 | ERR("Failed to format channel index directory"); | |
7148 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7149 | goto error; | |
7150 | } | |
7151 | /* | |
7152 | * Create the index subdirectory which will take care | |
7153 | * of implicitly creating the channel's path. | |
7154 | */ | |
7155 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
7156 | usess->current_trace_chunk, | |
7157 | pathname_index); | |
7158 | free(pathname_index); | |
7159 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
7160 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
7161 | goto error; | |
7162 | } | |
7163 | } | |
7164 | break; | |
7165 | } | |
7166 | default: | |
7167 | abort(); | |
7168 | } | |
7169 | ||
7170 | ret = LTTNG_OK; | |
7171 | error: | |
7172 | rcu_read_unlock(); | |
7173 | return ret; | |
7174 | } | |
4a9b9759 MD |
7175 | |
7176 | /* | |
7177 | * Clear all the channels of a session. | |
7178 | * | |
7179 | * Return LTTNG_OK on success or else an LTTng error code. | |
7180 | */ | |
7181 | enum lttng_error_code ust_app_clear_session(struct ltt_session *session) | |
7182 | { | |
7183 | int ret; | |
7184 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
7185 | struct lttng_ht_iter iter; | |
7186 | struct ust_app *app; | |
7187 | struct ltt_ust_session *usess = session->ust_session; | |
7188 | ||
7189 | assert(usess); | |
7190 | ||
7191 | rcu_read_lock(); | |
7192 | ||
7193 | if (usess->active) { | |
7194 | ERR("Expecting inactive session %s (%" PRIu64 ")", session->name, session->id); | |
7195 | cmd_ret = LTTNG_ERR_FATAL; | |
7196 | goto end; | |
7197 | } | |
7198 | ||
7199 | switch (usess->buffer_type) { | |
7200 | case LTTNG_BUFFER_PER_UID: | |
7201 | { | |
7202 | struct buffer_reg_uid *reg; | |
7203 | ||
7204 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
7205 | struct buffer_reg_channel *reg_chan; | |
7206 | struct consumer_socket *socket; | |
7207 | ||
7208 | /* Get consumer socket to use to push the metadata.*/ | |
7209 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
7210 | usess->consumer); | |
7211 | if (!socket) { | |
7212 | cmd_ret = LTTNG_ERR_INVALID; | |
7213 | goto error_socket; | |
7214 | } | |
7215 | ||
7216 | /* Clear the data channels. */ | |
7217 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
7218 | reg_chan, node.node) { | |
7219 | ret = consumer_clear_channel(socket, | |
7220 | reg_chan->consumer_key); | |
7221 | if (ret < 0) { | |
7222 | goto error; | |
7223 | } | |
7224 | } | |
7225 | ||
7226 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
7227 | ||
7228 | /* | |
7229 | * Clear the metadata channel. | |
7230 | * Metadata channel is not cleared per se but we still need to | |
7231 | * perform a rotation operation on it behind the scene. | |
7232 | */ | |
7233 | ret = consumer_clear_channel(socket, | |
7234 | reg->registry->reg.ust->metadata_key); | |
7235 | if (ret < 0) { | |
7236 | goto error; | |
7237 | } | |
7238 | } | |
7239 | break; | |
7240 | } | |
7241 | case LTTNG_BUFFER_PER_PID: | |
7242 | { | |
7243 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7244 | struct consumer_socket *socket; | |
7245 | struct lttng_ht_iter chan_iter; | |
7246 | struct ust_app_channel *ua_chan; | |
7247 | struct ust_app_session *ua_sess; | |
7248 | struct ust_registry_session *registry; | |
7249 | ||
7250 | ua_sess = lookup_session_by_app(usess, app); | |
7251 | if (!ua_sess) { | |
7252 | /* Session not associated with this app. */ | |
7253 | continue; | |
7254 | } | |
7255 | ||
7256 | /* Get the right consumer socket for the application. */ | |
7257 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
7258 | usess->consumer); | |
7259 | if (!socket) { | |
7260 | cmd_ret = LTTNG_ERR_INVALID; | |
7261 | goto error_socket; | |
7262 | } | |
7263 | ||
7264 | registry = get_session_registry(ua_sess); | |
7265 | if (!registry) { | |
7266 | DBG("Application session is being torn down. Skip application."); | |
7267 | continue; | |
7268 | } | |
7269 | ||
7270 | /* Clear the data channels. */ | |
7271 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
7272 | ua_chan, node.node) { | |
7273 | ret = consumer_clear_channel(socket, ua_chan->key); | |
7274 | if (ret < 0) { | |
7275 | /* Per-PID buffer and application going away. */ | |
7276 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7277 | continue; | |
7278 | } | |
7279 | goto error; | |
7280 | } | |
7281 | } | |
7282 | ||
7283 | (void) push_metadata(registry, usess->consumer); | |
7284 | ||
7285 | /* | |
7286 | * Clear the metadata channel. | |
7287 | * Metadata channel is not cleared per se but we still need to | |
7288 | * perform rotation operation on it behind the scene. | |
7289 | */ | |
7290 | ret = consumer_clear_channel(socket, registry->metadata_key); | |
7291 | if (ret < 0) { | |
7292 | /* Per-PID buffer and application going away. */ | |
7293 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) { | |
7294 | continue; | |
7295 | } | |
7296 | goto error; | |
7297 | } | |
7298 | } | |
7299 | break; | |
7300 | } | |
7301 | default: | |
7302 | assert(0); | |
7303 | break; | |
7304 | } | |
7305 | ||
7306 | cmd_ret = LTTNG_OK; | |
7307 | goto end; | |
7308 | ||
7309 | error: | |
7310 | switch (-ret) { | |
7311 | case LTTCOMM_CONSUMERD_RELAYD_CLEAR_DISALLOWED: | |
7312 | cmd_ret = LTTNG_ERR_CLEAR_RELAY_DISALLOWED; | |
7313 | break; | |
7314 | default: | |
7315 | cmd_ret = LTTNG_ERR_CLEAR_FAIL_CONSUMER; | |
7316 | } | |
7317 | ||
7318 | error_socket: | |
7319 | end: | |
7320 | rcu_read_unlock(); | |
7321 | return cmd_ret; | |
7322 | } | |
04ed9e10 JG |
7323 | |
7324 | /* | |
7325 | * This function skips the metadata channel as the begin/end timestamps of a | |
7326 | * metadata packet are useless. | |
7327 | * | |
7328 | * Moreover, opening a packet after a "clear" will cause problems for live | |
7329 | * sessions as it will introduce padding that was not part of the first trace | |
7330 | * chunk. The relay daemon expects the content of the metadata stream of | |
7331 | * successive metadata trace chunks to be strict supersets of one another. | |
7332 | * | |
7333 | * For example, flushing a packet at the beginning of the metadata stream of | |
7334 | * a trace chunk resulting from a "clear" session command will cause the | |
7335 | * size of the metadata stream of the new trace chunk to not match the size of | |
7336 | * the metadata stream of the original chunk. This will confuse the relay | |
7337 | * daemon as the same "offset" in a metadata stream will no longer point | |
7338 | * to the same content. | |
7339 | */ | |
7340 | enum lttng_error_code ust_app_open_packets(struct ltt_session *session) | |
7341 | { | |
7342 | enum lttng_error_code ret = LTTNG_OK; | |
7343 | struct lttng_ht_iter iter; | |
7344 | struct ltt_ust_session *usess = session->ust_session; | |
7345 | ||
7346 | assert(usess); | |
7347 | ||
7348 | rcu_read_lock(); | |
7349 | ||
7350 | switch (usess->buffer_type) { | |
7351 | case LTTNG_BUFFER_PER_UID: | |
7352 | { | |
7353 | struct buffer_reg_uid *reg; | |
7354 | ||
7355 | cds_list_for_each_entry ( | |
7356 | reg, &usess->buffer_reg_uid_list, lnode) { | |
7357 | struct buffer_reg_channel *reg_chan; | |
7358 | struct consumer_socket *socket; | |
7359 | ||
7360 | socket = consumer_find_socket_by_bitness( | |
7361 | reg->bits_per_long, usess->consumer); | |
7362 | if (!socket) { | |
7363 | ret = LTTNG_ERR_FATAL; | |
7364 | goto error; | |
7365 | } | |
7366 | ||
7367 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
7368 | &iter.iter, reg_chan, node.node) { | |
7369 | const int open_ret = | |
7370 | consumer_open_channel_packets( | |
7371 | socket, | |
7372 | reg_chan->consumer_key); | |
7373 | ||
7374 | if (open_ret < 0) { | |
7375 | ret = LTTNG_ERR_UNK; | |
7376 | goto error; | |
7377 | } | |
7378 | } | |
7379 | } | |
7380 | break; | |
7381 | } | |
7382 | case LTTNG_BUFFER_PER_PID: | |
7383 | { | |
7384 | struct ust_app *app; | |
7385 | ||
7386 | cds_lfht_for_each_entry ( | |
7387 | ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
7388 | struct consumer_socket *socket; | |
7389 | struct lttng_ht_iter chan_iter; | |
7390 | struct ust_app_channel *ua_chan; | |
7391 | struct ust_app_session *ua_sess; | |
7392 | struct ust_registry_session *registry; | |
7393 | ||
7394 | ua_sess = lookup_session_by_app(usess, app); | |
7395 | if (!ua_sess) { | |
7396 | /* Session not associated with this app. */ | |
7397 | continue; | |
7398 | } | |
7399 | ||
7400 | /* Get the right consumer socket for the application. */ | |
7401 | socket = consumer_find_socket_by_bitness( | |
7402 | app->bits_per_long, usess->consumer); | |
7403 | if (!socket) { | |
7404 | ret = LTTNG_ERR_FATAL; | |
7405 | goto error; | |
7406 | } | |
7407 | ||
7408 | registry = get_session_registry(ua_sess); | |
7409 | if (!registry) { | |
7410 | DBG("Application session is being torn down. Skip application."); | |
7411 | continue; | |
7412 | } | |
7413 | ||
7414 | cds_lfht_for_each_entry(ua_sess->channels->ht, | |
7415 | &chan_iter.iter, ua_chan, node.node) { | |
7416 | const int open_ret = | |
7417 | consumer_open_channel_packets( | |
7418 | socket, | |
7419 | ua_chan->key); | |
7420 | ||
7421 | if (open_ret < 0) { | |
7422 | /* | |
7423 | * Per-PID buffer and application going | |
7424 | * away. | |
7425 | */ | |
97a171e1 | 7426 | if (open_ret == -LTTNG_ERR_CHAN_NOT_FOUND) { |
04ed9e10 JG |
7427 | continue; |
7428 | } | |
7429 | ||
7430 | ret = LTTNG_ERR_UNK; | |
7431 | goto error; | |
7432 | } | |
7433 | } | |
7434 | } | |
7435 | break; | |
7436 | } | |
7437 | default: | |
7438 | abort(); | |
7439 | break; | |
7440 | } | |
7441 | ||
7442 | error: | |
7443 | rcu_read_unlock(); | |
7444 | return ret; | |
7445 | } |