Commit | Line | Data |
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91d76f53 DG |
1 | /* |
2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> | |
bdf64013 | 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
91d76f53 | 4 | * |
d14d33bf AM |
5 | * This program is free software; you can redistribute it and/or modify |
6 | * it under the terms of the GNU General Public License, version 2 only, | |
7 | * as published by the Free Software Foundation. | |
91d76f53 DG |
8 | * |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
d14d33bf AM |
14 | * You should have received a copy of the GNU General Public License along |
15 | * with this program; if not, write to the Free Software Foundation, Inc., | |
16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
91d76f53 DG |
17 | */ |
18 | ||
6c1c0768 | 19 | #define _LGPL_SOURCE |
91d76f53 | 20 | #include <errno.h> |
7972aab2 | 21 | #include <inttypes.h> |
91d76f53 DG |
22 | #include <pthread.h> |
23 | #include <stdio.h> | |
24 | #include <stdlib.h> | |
099e26bd | 25 | #include <string.h> |
aba8e916 DG |
26 | #include <sys/stat.h> |
27 | #include <sys/types.h> | |
099e26bd | 28 | #include <unistd.h> |
0df502fd | 29 | #include <urcu/compiler.h> |
fb54cdbf | 30 | #include <lttng/ust-error.h> |
331744e3 | 31 | #include <signal.h> |
bec39940 | 32 | |
990570ed | 33 | #include <common/common.h> |
86acf0da | 34 | #include <common/sessiond-comm/sessiond-comm.h> |
1e307fab | 35 | |
7972aab2 | 36 | #include "buffer-registry.h" |
86acf0da | 37 | #include "fd-limit.h" |
8782cc74 | 38 | #include "health-sessiond.h" |
56fff090 | 39 | #include "ust-app.h" |
48842b30 | 40 | #include "ust-consumer.h" |
d80a6244 | 41 | #include "ust-ctl.h" |
0b2dc8df | 42 | #include "utils.h" |
fb83fe64 | 43 | #include "session.h" |
e9404c27 JG |
44 | #include "lttng-sessiond.h" |
45 | #include "notification-thread-commands.h" | |
5c408ad8 | 46 | #include "rotate.h" |
d80a6244 | 47 | |
c4b88406 MD |
48 | static |
49 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
50 | ||
d9bf3ca4 MD |
51 | /* Next available channel key. Access under next_channel_key_lock. */ |
52 | static uint64_t _next_channel_key; | |
53 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
54 | ||
55 | /* Next available session ID. Access under next_session_id_lock. */ | |
56 | static uint64_t _next_session_id; | |
57 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
58 | |
59 | /* | |
d9bf3ca4 | 60 | * Return the incremented value of next_channel_key. |
ffe60014 | 61 | */ |
d9bf3ca4 | 62 | static uint64_t get_next_channel_key(void) |
ffe60014 | 63 | { |
d9bf3ca4 MD |
64 | uint64_t ret; |
65 | ||
66 | pthread_mutex_lock(&next_channel_key_lock); | |
67 | ret = ++_next_channel_key; | |
68 | pthread_mutex_unlock(&next_channel_key_lock); | |
69 | return ret; | |
ffe60014 DG |
70 | } |
71 | ||
72 | /* | |
7972aab2 | 73 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 74 | */ |
d9bf3ca4 | 75 | static uint64_t get_next_session_id(void) |
ffe60014 | 76 | { |
d9bf3ca4 MD |
77 | uint64_t ret; |
78 | ||
79 | pthread_mutex_lock(&next_session_id_lock); | |
80 | ret = ++_next_session_id; | |
81 | pthread_mutex_unlock(&next_session_id_lock); | |
82 | return ret; | |
ffe60014 DG |
83 | } |
84 | ||
d65d2de8 DG |
85 | static void copy_channel_attr_to_ustctl( |
86 | struct ustctl_consumer_channel_attr *attr, | |
87 | struct lttng_ust_channel_attr *uattr) | |
88 | { | |
89 | /* Copy event attributes since the layout is different. */ | |
90 | attr->subbuf_size = uattr->subbuf_size; | |
91 | attr->num_subbuf = uattr->num_subbuf; | |
92 | attr->overwrite = uattr->overwrite; | |
93 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
94 | attr->read_timer_interval = uattr->read_timer_interval; | |
95 | attr->output = uattr->output; | |
491d1539 | 96 | attr->blocking_timeout = uattr->u.s.blocking_timeout; |
d65d2de8 DG |
97 | } |
98 | ||
025faf73 DG |
99 | /* |
100 | * Match function for the hash table lookup. | |
101 | * | |
102 | * It matches an ust app event based on three attributes which are the event | |
103 | * name, the filter bytecode and the loglevel. | |
104 | */ | |
18eace3b DG |
105 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
106 | { | |
107 | struct ust_app_event *event; | |
108 | const struct ust_app_ht_key *key; | |
2106efa0 | 109 | int ev_loglevel_value; |
18eace3b DG |
110 | |
111 | assert(node); | |
112 | assert(_key); | |
113 | ||
114 | event = caa_container_of(node, struct ust_app_event, node.node); | |
115 | key = _key; | |
2106efa0 | 116 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 117 | |
1af53eb5 | 118 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
119 | |
120 | /* Event name */ | |
121 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
122 | goto no_match; | |
123 | } | |
124 | ||
125 | /* Event loglevel. */ | |
2106efa0 | 126 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 127 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
128 | && key->loglevel_type == 0 && |
129 | ev_loglevel_value == -1) { | |
025faf73 DG |
130 | /* |
131 | * Match is accepted. This is because on event creation, the | |
132 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
133 | * -1 are accepted for this loglevel type since 0 is the one set by | |
134 | * the API when receiving an enable event. | |
135 | */ | |
136 | } else { | |
137 | goto no_match; | |
138 | } | |
18eace3b DG |
139 | } |
140 | ||
141 | /* One of the filters is NULL, fail. */ | |
142 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
143 | goto no_match; | |
144 | } | |
145 | ||
025faf73 DG |
146 | if (key->filter && event->filter) { |
147 | /* Both filters exists, check length followed by the bytecode. */ | |
148 | if (event->filter->len != key->filter->len || | |
149 | memcmp(event->filter->data, key->filter->data, | |
150 | event->filter->len) != 0) { | |
151 | goto no_match; | |
152 | } | |
18eace3b DG |
153 | } |
154 | ||
1af53eb5 JI |
155 | /* One of the exclusions is NULL, fail. */ |
156 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
157 | goto no_match; | |
158 | } | |
159 | ||
160 | if (key->exclusion && event->exclusion) { | |
161 | /* Both exclusions exists, check count followed by the names. */ | |
162 | if (event->exclusion->count != key->exclusion->count || | |
163 | memcmp(event->exclusion->names, key->exclusion->names, | |
164 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
165 | goto no_match; | |
166 | } | |
167 | } | |
168 | ||
169 | ||
025faf73 | 170 | /* Match. */ |
18eace3b DG |
171 | return 1; |
172 | ||
173 | no_match: | |
174 | return 0; | |
18eace3b DG |
175 | } |
176 | ||
025faf73 DG |
177 | /* |
178 | * Unique add of an ust app event in the given ht. This uses the custom | |
179 | * ht_match_ust_app_event match function and the event name as hash. | |
180 | */ | |
d0b96690 | 181 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
182 | struct ust_app_event *event) |
183 | { | |
184 | struct cds_lfht_node *node_ptr; | |
185 | struct ust_app_ht_key key; | |
d0b96690 | 186 | struct lttng_ht *ht; |
18eace3b | 187 | |
d0b96690 DG |
188 | assert(ua_chan); |
189 | assert(ua_chan->events); | |
18eace3b DG |
190 | assert(event); |
191 | ||
d0b96690 | 192 | ht = ua_chan->events; |
18eace3b DG |
193 | key.name = event->attr.name; |
194 | key.filter = event->filter; | |
2106efa0 | 195 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 196 | key.exclusion = event->exclusion; |
18eace3b DG |
197 | |
198 | node_ptr = cds_lfht_add_unique(ht->ht, | |
199 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
200 | ht_match_ust_app_event, &key, &event->node.node); | |
201 | assert(node_ptr == &event->node.node); | |
202 | } | |
203 | ||
d88aee68 DG |
204 | /* |
205 | * Close the notify socket from the given RCU head object. This MUST be called | |
206 | * through a call_rcu(). | |
207 | */ | |
208 | static void close_notify_sock_rcu(struct rcu_head *head) | |
209 | { | |
210 | int ret; | |
211 | struct ust_app_notify_sock_obj *obj = | |
212 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
213 | ||
214 | /* Must have a valid fd here. */ | |
215 | assert(obj->fd >= 0); | |
216 | ||
217 | ret = close(obj->fd); | |
218 | if (ret) { | |
219 | ERR("close notify sock %d RCU", obj->fd); | |
220 | } | |
221 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
222 | ||
223 | free(obj); | |
224 | } | |
225 | ||
7972aab2 DG |
226 | /* |
227 | * Return the session registry according to the buffer type of the given | |
228 | * session. | |
229 | * | |
230 | * A registry per UID object MUST exists before calling this function or else | |
231 | * it assert() if not found. RCU read side lock must be acquired. | |
232 | */ | |
233 | static struct ust_registry_session *get_session_registry( | |
234 | struct ust_app_session *ua_sess) | |
235 | { | |
236 | struct ust_registry_session *registry = NULL; | |
237 | ||
238 | assert(ua_sess); | |
239 | ||
240 | switch (ua_sess->buffer_type) { | |
241 | case LTTNG_BUFFER_PER_PID: | |
242 | { | |
243 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
244 | if (!reg_pid) { | |
245 | goto error; | |
246 | } | |
247 | registry = reg_pid->registry->reg.ust; | |
248 | break; | |
249 | } | |
250 | case LTTNG_BUFFER_PER_UID: | |
251 | { | |
252 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
470cc211 JG |
253 | ua_sess->tracing_id, ua_sess->bits_per_long, |
254 | ua_sess->real_credentials.uid); | |
7972aab2 DG |
255 | if (!reg_uid) { |
256 | goto error; | |
257 | } | |
258 | registry = reg_uid->registry->reg.ust; | |
259 | break; | |
260 | } | |
261 | default: | |
262 | assert(0); | |
263 | }; | |
264 | ||
265 | error: | |
266 | return registry; | |
267 | } | |
268 | ||
55cc08a6 DG |
269 | /* |
270 | * Delete ust context safely. RCU read lock must be held before calling | |
271 | * this function. | |
272 | */ | |
273 | static | |
fb45065e MD |
274 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
275 | struct ust_app *app) | |
55cc08a6 | 276 | { |
ffe60014 DG |
277 | int ret; |
278 | ||
279 | assert(ua_ctx); | |
280 | ||
55cc08a6 | 281 | if (ua_ctx->obj) { |
fb45065e | 282 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 283 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 284 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
285 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
286 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
287 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 288 | } |
55cc08a6 DG |
289 | free(ua_ctx->obj); |
290 | } | |
291 | free(ua_ctx); | |
292 | } | |
293 | ||
d80a6244 DG |
294 | /* |
295 | * Delete ust app event safely. RCU read lock must be held before calling | |
296 | * this function. | |
297 | */ | |
8b366481 | 298 | static |
fb45065e MD |
299 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
300 | struct ust_app *app) | |
d80a6244 | 301 | { |
ffe60014 DG |
302 | int ret; |
303 | ||
304 | assert(ua_event); | |
305 | ||
53a80697 | 306 | free(ua_event->filter); |
951f0b71 JI |
307 | if (ua_event->exclusion != NULL) |
308 | free(ua_event->exclusion); | |
edb67388 | 309 | if (ua_event->obj != NULL) { |
fb45065e | 310 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 311 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 312 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
313 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
314 | ERR("UST app sock %d release event obj failed with ret %d", | |
315 | sock, ret); | |
316 | } | |
edb67388 DG |
317 | free(ua_event->obj); |
318 | } | |
d80a6244 DG |
319 | free(ua_event); |
320 | } | |
321 | ||
322 | /* | |
7972aab2 DG |
323 | * Release ust data object of the given stream. |
324 | * | |
325 | * Return 0 on success or else a negative value. | |
d80a6244 | 326 | */ |
fb45065e MD |
327 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
328 | struct ust_app *app) | |
d80a6244 | 329 | { |
7972aab2 | 330 | int ret = 0; |
ffe60014 DG |
331 | |
332 | assert(stream); | |
333 | ||
8b366481 | 334 | if (stream->obj) { |
fb45065e | 335 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 336 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 337 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
338 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
339 | ERR("UST app sock %d release stream obj failed with ret %d", | |
340 | sock, ret); | |
341 | } | |
4063050c | 342 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
343 | free(stream->obj); |
344 | } | |
7972aab2 DG |
345 | |
346 | return ret; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Delete ust app stream safely. RCU read lock must be held before calling | |
351 | * this function. | |
352 | */ | |
353 | static | |
fb45065e MD |
354 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
355 | struct ust_app *app) | |
7972aab2 DG |
356 | { |
357 | assert(stream); | |
358 | ||
fb45065e | 359 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 360 | free(stream); |
d80a6244 DG |
361 | } |
362 | ||
36b588ed MD |
363 | /* |
364 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
365 | * section and outside of call_rcu thread, so we postpone its execution |
366 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
367 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
368 | */ |
369 | static | |
370 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
371 | { | |
372 | struct ust_app_channel *ua_chan = | |
373 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
374 | ||
0b2dc8df MD |
375 | ht_cleanup_push(ua_chan->ctx); |
376 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
377 | free(ua_chan); |
378 | } | |
379 | ||
fb83fe64 JD |
380 | /* |
381 | * Extract the lost packet or discarded events counter when the channel is | |
382 | * being deleted and store the value in the parent channel so we can | |
383 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
384 | * |
385 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
386 | */ |
387 | static | |
388 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
389 | { | |
390 | uint64_t discarded = 0, lost = 0; | |
391 | struct ltt_session *session; | |
392 | struct ltt_ust_channel *uchan; | |
393 | ||
394 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
395 | return; | |
396 | } | |
397 | ||
398 | rcu_read_lock(); | |
399 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
400 | if (!session || !session->ust_session) { |
401 | /* | |
402 | * Not finding the session is not an error because there are | |
403 | * multiple ways the channels can be torn down. | |
404 | * | |
405 | * 1) The session daemon can initiate the destruction of the | |
406 | * ust app session after receiving a destroy command or | |
407 | * during its shutdown/teardown. | |
408 | * 2) The application, since we are in per-pid tracing, is | |
409 | * unregistering and tearing down its ust app session. | |
410 | * | |
411 | * Both paths are protected by the session list lock which | |
412 | * ensures that the accounting of lost packets and discarded | |
413 | * events is done exactly once. The session is then unpublished | |
414 | * from the session list, resulting in this condition. | |
415 | */ | |
fb83fe64 JD |
416 | goto end; |
417 | } | |
418 | ||
419 | if (ua_chan->attr.overwrite) { | |
420 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
421 | ua_chan->key, session->ust_session->consumer, | |
422 | &lost); | |
423 | } else { | |
424 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
425 | ua_chan->key, session->ust_session->consumer, | |
426 | &discarded); | |
427 | } | |
428 | uchan = trace_ust_find_channel_by_name( | |
429 | session->ust_session->domain_global.channels, | |
430 | ua_chan->name); | |
431 | if (!uchan) { | |
432 | ERR("Missing UST channel to store discarded counters"); | |
433 | goto end; | |
434 | } | |
435 | ||
436 | uchan->per_pid_closed_app_discarded += discarded; | |
437 | uchan->per_pid_closed_app_lost += lost; | |
438 | ||
439 | end: | |
440 | rcu_read_unlock(); | |
e32d7f27 JG |
441 | if (session) { |
442 | session_put(session); | |
443 | } | |
fb83fe64 JD |
444 | } |
445 | ||
d80a6244 DG |
446 | /* |
447 | * Delete ust app channel safely. RCU read lock must be held before calling | |
448 | * this function. | |
82cac6d2 JG |
449 | * |
450 | * The session list lock must be held by the caller. | |
d80a6244 | 451 | */ |
8b366481 | 452 | static |
d0b96690 DG |
453 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
454 | struct ust_app *app) | |
d80a6244 DG |
455 | { |
456 | int ret; | |
bec39940 | 457 | struct lttng_ht_iter iter; |
d80a6244 | 458 | struct ust_app_event *ua_event; |
55cc08a6 | 459 | struct ust_app_ctx *ua_ctx; |
030a66fa | 460 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 461 | struct ust_registry_session *registry; |
d80a6244 | 462 | |
ffe60014 DG |
463 | assert(ua_chan); |
464 | ||
465 | DBG3("UST app deleting channel %s", ua_chan->name); | |
466 | ||
55cc08a6 | 467 | /* Wipe stream */ |
d80a6244 | 468 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 469 | cds_list_del(&stream->list); |
fb45065e | 470 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
471 | } |
472 | ||
55cc08a6 | 473 | /* Wipe context */ |
bec39940 | 474 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 475 | cds_list_del(&ua_ctx->list); |
bec39940 | 476 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 477 | assert(!ret); |
fb45065e | 478 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 479 | } |
d80a6244 | 480 | |
55cc08a6 | 481 | /* Wipe events */ |
bec39940 DG |
482 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
483 | node.node) { | |
484 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 485 | assert(!ret); |
fb45065e | 486 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 487 | } |
edb67388 | 488 | |
c8335706 MD |
489 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
490 | /* Wipe and free registry from session registry. */ | |
491 | registry = get_session_registry(ua_chan->session); | |
492 | if (registry) { | |
e9404c27 | 493 | ust_registry_channel_del_free(registry, ua_chan->key, |
e38d96f9 MD |
494 | sock >= 0); |
495 | } | |
45798a31 JG |
496 | /* |
497 | * A negative socket can be used by the caller when | |
498 | * cleaning-up a ua_chan in an error path. Skip the | |
499 | * accounting in this case. | |
500 | */ | |
e38d96f9 MD |
501 | if (sock >= 0) { |
502 | save_per_pid_lost_discarded_counters(ua_chan); | |
c8335706 | 503 | } |
7972aab2 | 504 | } |
d0b96690 | 505 | |
edb67388 | 506 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
507 | /* Remove channel from application UST object descriptor. */ |
508 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
509 | ret = lttng_ht_del(app->ust_objd, &iter); |
510 | assert(!ret); | |
fb45065e | 511 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 512 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 513 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
514 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
515 | ERR("UST app sock %d release channel obj failed with ret %d", | |
516 | sock, ret); | |
517 | } | |
7972aab2 | 518 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
519 | free(ua_chan->obj); |
520 | } | |
36b588ed | 521 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
522 | } |
523 | ||
fb45065e MD |
524 | int ust_app_register_done(struct ust_app *app) |
525 | { | |
526 | int ret; | |
527 | ||
528 | pthread_mutex_lock(&app->sock_lock); | |
529 | ret = ustctl_register_done(app->sock); | |
530 | pthread_mutex_unlock(&app->sock_lock); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
535 | { | |
536 | int ret, sock; | |
537 | ||
538 | if (app) { | |
539 | pthread_mutex_lock(&app->sock_lock); | |
540 | sock = app->sock; | |
541 | } else { | |
542 | sock = -1; | |
543 | } | |
544 | ret = ustctl_release_object(sock, data); | |
545 | if (app) { | |
546 | pthread_mutex_unlock(&app->sock_lock); | |
547 | } | |
548 | return ret; | |
549 | } | |
550 | ||
331744e3 | 551 | /* |
1b532a60 DG |
552 | * Push metadata to consumer socket. |
553 | * | |
dc2bbdae MD |
554 | * RCU read-side lock must be held to guarantee existance of socket. |
555 | * Must be called with the ust app session lock held. | |
556 | * Must be called with the registry lock held. | |
331744e3 JD |
557 | * |
558 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
559 | * Returning a -EPIPE return value means we could not send the metadata, |
560 | * but it can be caused by recoverable errors (e.g. the application has | |
561 | * terminated concurrently). | |
331744e3 JD |
562 | */ |
563 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
564 | struct consumer_socket *socket, int send_zero_data) | |
565 | { | |
566 | int ret; | |
567 | char *metadata_str = NULL; | |
c585821b | 568 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 569 | ssize_t ret_val; |
93ec662e | 570 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
571 | |
572 | assert(registry); | |
573 | assert(socket); | |
1b532a60 | 574 | |
c585821b MD |
575 | metadata_key = registry->metadata_key; |
576 | ||
ce34fcd0 | 577 | /* |
dc2bbdae MD |
578 | * Means that no metadata was assigned to the session. This can |
579 | * happens if no start has been done previously. | |
ce34fcd0 | 580 | */ |
c585821b | 581 | if (!metadata_key) { |
ce34fcd0 MD |
582 | return 0; |
583 | } | |
584 | ||
331744e3 JD |
585 | offset = registry->metadata_len_sent; |
586 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 587 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 588 | metadata_version = registry->metadata_version; |
331744e3 JD |
589 | if (len == 0) { |
590 | DBG3("No metadata to push for metadata key %" PRIu64, | |
591 | registry->metadata_key); | |
592 | ret_val = len; | |
593 | if (send_zero_data) { | |
594 | DBG("No metadata to push"); | |
595 | goto push_data; | |
596 | } | |
597 | goto end; | |
598 | } | |
599 | ||
600 | /* Allocate only what we have to send. */ | |
601 | metadata_str = zmalloc(len); | |
602 | if (!metadata_str) { | |
603 | PERROR("zmalloc ust app metadata string"); | |
604 | ret_val = -ENOMEM; | |
605 | goto error; | |
606 | } | |
c585821b | 607 | /* Copy what we haven't sent out. */ |
331744e3 | 608 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
609 | |
610 | push_data: | |
c585821b MD |
611 | pthread_mutex_unlock(®istry->lock); |
612 | /* | |
613 | * We need to unlock the registry while we push metadata to | |
614 | * break a circular dependency between the consumerd metadata | |
615 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
616 | * to the consumerd awaits that it gets pushed all the way to | |
617 | * relayd, but doing so requires grabbing the metadata lock. If | |
618 | * a concurrent metadata request is being performed by | |
619 | * consumerd, this can try to grab the registry lock on the | |
620 | * sessiond while holding the metadata lock on the consumer | |
621 | * daemon. Those push and pull schemes are performed on two | |
622 | * different bidirectionnal communication sockets. | |
623 | */ | |
624 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 625 | metadata_str, len, offset, metadata_version); |
c585821b | 626 | pthread_mutex_lock(®istry->lock); |
331744e3 | 627 | if (ret < 0) { |
000baf6a | 628 | /* |
dc2bbdae MD |
629 | * There is an acceptable race here between the registry |
630 | * metadata key assignment and the creation on the | |
631 | * consumer. The session daemon can concurrently push | |
632 | * metadata for this registry while being created on the | |
633 | * consumer since the metadata key of the registry is | |
634 | * assigned *before* it is setup to avoid the consumer | |
635 | * to ask for metadata that could possibly be not found | |
636 | * in the session daemon. | |
000baf6a | 637 | * |
dc2bbdae MD |
638 | * The metadata will get pushed either by the session |
639 | * being stopped or the consumer requesting metadata if | |
640 | * that race is triggered. | |
000baf6a DG |
641 | */ |
642 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
643 | ret = 0; | |
c585821b MD |
644 | } else { |
645 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 646 | } |
331744e3 JD |
647 | ret_val = ret; |
648 | goto error_push; | |
c585821b MD |
649 | } else { |
650 | /* | |
651 | * Metadata may have been concurrently pushed, since | |
652 | * we're not holding the registry lock while pushing to | |
653 | * consumer. This is handled by the fact that we send | |
654 | * the metadata content, size, and the offset at which | |
655 | * that metadata belongs. This may arrive out of order | |
656 | * on the consumer side, and the consumer is able to | |
657 | * deal with overlapping fragments. The consumer | |
658 | * supports overlapping fragments, which must be | |
659 | * contiguous starting from offset 0. We keep the | |
660 | * largest metadata_len_sent value of the concurrent | |
661 | * send. | |
662 | */ | |
663 | registry->metadata_len_sent = | |
664 | max_t(size_t, registry->metadata_len_sent, | |
665 | new_metadata_len_sent); | |
331744e3 | 666 | } |
331744e3 JD |
667 | free(metadata_str); |
668 | return len; | |
669 | ||
670 | end: | |
671 | error: | |
ce34fcd0 MD |
672 | if (ret_val) { |
673 | /* | |
dc2bbdae MD |
674 | * On error, flag the registry that the metadata is |
675 | * closed. We were unable to push anything and this | |
676 | * means that either the consumer is not responding or | |
677 | * the metadata cache has been destroyed on the | |
678 | * consumer. | |
ce34fcd0 MD |
679 | */ |
680 | registry->metadata_closed = 1; | |
681 | } | |
331744e3 JD |
682 | error_push: |
683 | free(metadata_str); | |
684 | return ret_val; | |
685 | } | |
686 | ||
d88aee68 | 687 | /* |
ce34fcd0 | 688 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
689 | * Either sock or consumer is required : if sock is NULL, the default |
690 | * socket to send the metadata is retrieved from consumer, if sock | |
691 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 692 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
693 | * therefore ensuring existance of registry. It also ensures existance |
694 | * of socket throughout this function. | |
d88aee68 DG |
695 | * |
696 | * Return 0 on success else a negative error. | |
2c57e06d MD |
697 | * Returning a -EPIPE return value means we could not send the metadata, |
698 | * but it can be caused by recoverable errors (e.g. the application has | |
699 | * terminated concurrently). | |
d88aee68 | 700 | */ |
7972aab2 DG |
701 | static int push_metadata(struct ust_registry_session *registry, |
702 | struct consumer_output *consumer) | |
d88aee68 | 703 | { |
331744e3 JD |
704 | int ret_val; |
705 | ssize_t ret; | |
d88aee68 DG |
706 | struct consumer_socket *socket; |
707 | ||
7972aab2 DG |
708 | assert(registry); |
709 | assert(consumer); | |
710 | ||
ce34fcd0 | 711 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 712 | if (registry->metadata_closed) { |
dc2bbdae MD |
713 | ret_val = -EPIPE; |
714 | goto error; | |
d88aee68 DG |
715 | } |
716 | ||
d88aee68 | 717 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
718 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
719 | consumer); | |
d88aee68 | 720 | if (!socket) { |
331744e3 | 721 | ret_val = -1; |
ce34fcd0 | 722 | goto error; |
d88aee68 DG |
723 | } |
724 | ||
331744e3 | 725 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 726 | if (ret < 0) { |
331744e3 | 727 | ret_val = ret; |
ce34fcd0 | 728 | goto error; |
d88aee68 | 729 | } |
dc2bbdae | 730 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
731 | return 0; |
732 | ||
ce34fcd0 | 733 | error: |
dc2bbdae | 734 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 735 | return ret_val; |
d88aee68 DG |
736 | } |
737 | ||
738 | /* | |
739 | * Send to the consumer a close metadata command for the given session. Once | |
740 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 741 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
742 | * in the destroy path. |
743 | * | |
744 | * Return 0 on success else a negative value. | |
745 | */ | |
7972aab2 DG |
746 | static int close_metadata(struct ust_registry_session *registry, |
747 | struct consumer_output *consumer) | |
d88aee68 DG |
748 | { |
749 | int ret; | |
750 | struct consumer_socket *socket; | |
751 | ||
7972aab2 DG |
752 | assert(registry); |
753 | assert(consumer); | |
d88aee68 | 754 | |
7972aab2 DG |
755 | rcu_read_lock(); |
756 | ||
ce34fcd0 MD |
757 | pthread_mutex_lock(®istry->lock); |
758 | ||
7972aab2 | 759 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 760 | ret = 0; |
1b532a60 | 761 | goto end; |
d88aee68 DG |
762 | } |
763 | ||
d88aee68 | 764 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
765 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
766 | consumer); | |
d88aee68 DG |
767 | if (!socket) { |
768 | ret = -1; | |
7972aab2 | 769 | goto error; |
d88aee68 DG |
770 | } |
771 | ||
7972aab2 | 772 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 773 | if (ret < 0) { |
7972aab2 | 774 | goto error; |
d88aee68 DG |
775 | } |
776 | ||
d88aee68 | 777 | error: |
1b532a60 DG |
778 | /* |
779 | * Metadata closed. Even on error this means that the consumer is not | |
780 | * responding or not found so either way a second close should NOT be emit | |
781 | * for this registry. | |
782 | */ | |
783 | registry->metadata_closed = 1; | |
784 | end: | |
ce34fcd0 | 785 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 786 | rcu_read_unlock(); |
d88aee68 DG |
787 | return ret; |
788 | } | |
789 | ||
36b588ed MD |
790 | /* |
791 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
792 | * section and outside of call_rcu thread, so we postpone its execution |
793 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
794 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
795 | */ |
796 | static | |
797 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
798 | { | |
799 | struct ust_app_session *ua_sess = | |
800 | caa_container_of(head, struct ust_app_session, rcu_head); | |
801 | ||
0b2dc8df | 802 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
803 | free(ua_sess); |
804 | } | |
805 | ||
d80a6244 DG |
806 | /* |
807 | * Delete ust app session safely. RCU read lock must be held before calling | |
808 | * this function. | |
82cac6d2 JG |
809 | * |
810 | * The session list lock must be held by the caller. | |
d80a6244 | 811 | */ |
8b366481 | 812 | static |
d0b96690 DG |
813 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
814 | struct ust_app *app) | |
d80a6244 DG |
815 | { |
816 | int ret; | |
bec39940 | 817 | struct lttng_ht_iter iter; |
d80a6244 | 818 | struct ust_app_channel *ua_chan; |
7972aab2 | 819 | struct ust_registry_session *registry; |
d80a6244 | 820 | |
d88aee68 DG |
821 | assert(ua_sess); |
822 | ||
1b532a60 DG |
823 | pthread_mutex_lock(&ua_sess->lock); |
824 | ||
b161602a MD |
825 | assert(!ua_sess->deleted); |
826 | ua_sess->deleted = true; | |
827 | ||
7972aab2 | 828 | registry = get_session_registry(ua_sess); |
fad1ed2f | 829 | /* Registry can be null on error path during initialization. */ |
ce34fcd0 | 830 | if (registry) { |
d88aee68 | 831 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 832 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 833 | |
7972aab2 DG |
834 | /* |
835 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
836 | * metadata only on destroy trace session in this case. Also, the |
837 | * previous push metadata could have flag the metadata registry to | |
838 | * close so don't send a close command if closed. | |
7972aab2 | 839 | */ |
ce34fcd0 | 840 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
841 | /* And ask to close it for this session registry. */ |
842 | (void) close_metadata(registry, ua_sess->consumer); | |
843 | } | |
d80a6244 DG |
844 | } |
845 | ||
bec39940 DG |
846 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
847 | node.node) { | |
848 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 849 | assert(!ret); |
d0b96690 | 850 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 851 | } |
d80a6244 | 852 | |
7972aab2 DG |
853 | /* In case of per PID, the registry is kept in the session. */ |
854 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
855 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
856 | if (reg_pid) { | |
fad1ed2f JR |
857 | /* |
858 | * Registry can be null on error path during | |
859 | * initialization. | |
860 | */ | |
7972aab2 DG |
861 | buffer_reg_pid_remove(reg_pid); |
862 | buffer_reg_pid_destroy(reg_pid); | |
863 | } | |
864 | } | |
d0b96690 | 865 | |
aee6bafd | 866 | if (ua_sess->handle != -1) { |
fb45065e | 867 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 868 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 869 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
870 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
871 | ERR("UST app sock %d release session handle failed with ret %d", | |
872 | sock, ret); | |
873 | } | |
10b56aef MD |
874 | /* Remove session from application UST object descriptor. */ |
875 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
876 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
877 | assert(!ret); | |
aee6bafd | 878 | } |
10b56aef | 879 | |
1b532a60 DG |
880 | pthread_mutex_unlock(&ua_sess->lock); |
881 | ||
6addfa37 MD |
882 | consumer_output_put(ua_sess->consumer); |
883 | ||
36b588ed | 884 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 885 | } |
91d76f53 DG |
886 | |
887 | /* | |
284d8f55 DG |
888 | * Delete a traceable application structure from the global list. Never call |
889 | * this function outside of a call_rcu call. | |
36b588ed MD |
890 | * |
891 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 892 | */ |
8b366481 DG |
893 | static |
894 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 895 | { |
8b366481 | 896 | int ret, sock; |
d42f20df | 897 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 898 | |
82cac6d2 JG |
899 | /* |
900 | * The session list lock must be held during this function to guarantee | |
901 | * the existence of ua_sess. | |
902 | */ | |
903 | session_lock_list(); | |
d80a6244 | 904 | /* Delete ust app sessions info */ |
852d0037 DG |
905 | sock = app->sock; |
906 | app->sock = -1; | |
d80a6244 | 907 | |
8b366481 | 908 | /* Wipe sessions */ |
d42f20df DG |
909 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
910 | teardown_node) { | |
911 | /* Free every object in the session and the session. */ | |
36b588ed | 912 | rcu_read_lock(); |
d0b96690 | 913 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 914 | rcu_read_unlock(); |
d80a6244 | 915 | } |
36b588ed | 916 | |
0b2dc8df | 917 | ht_cleanup_push(app->sessions); |
10b56aef | 918 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 919 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 920 | |
6414a713 | 921 | /* |
852d0037 DG |
922 | * Wait until we have deleted the application from the sock hash table |
923 | * before closing this socket, otherwise an application could re-use the | |
924 | * socket ID and race with the teardown, using the same hash table entry. | |
925 | * | |
926 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
927 | * all RCU readers that could run concurrently with unregister app, | |
928 | * therefore we _need_ to only close that socket after a grace period. So | |
929 | * it should stay in this RCU callback. | |
930 | * | |
931 | * This close() is a very important step of the synchronization model so | |
932 | * every modification to this function must be carefully reviewed. | |
6414a713 | 933 | */ |
799e2c4f MD |
934 | ret = close(sock); |
935 | if (ret) { | |
936 | PERROR("close"); | |
937 | } | |
4063050c | 938 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 939 | |
852d0037 | 940 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 941 | free(app); |
82cac6d2 | 942 | session_unlock_list(); |
099e26bd DG |
943 | } |
944 | ||
945 | /* | |
f6a9efaa | 946 | * URCU intermediate call to delete an UST app. |
099e26bd | 947 | */ |
8b366481 DG |
948 | static |
949 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 950 | { |
bec39940 DG |
951 | struct lttng_ht_node_ulong *node = |
952 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 953 | struct ust_app *app = |
852d0037 | 954 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 955 | |
852d0037 | 956 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 957 | delete_ust_app(app); |
099e26bd DG |
958 | } |
959 | ||
ffe60014 DG |
960 | /* |
961 | * Delete the session from the application ht and delete the data structure by | |
962 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
963 | * |
964 | * The session list lock must be held by the caller. | |
ffe60014 | 965 | */ |
d0b96690 | 966 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
967 | struct ust_app_session *ua_sess) |
968 | { | |
969 | int ret; | |
970 | struct lttng_ht_iter iter; | |
971 | ||
972 | assert(app); | |
973 | assert(ua_sess); | |
974 | ||
975 | iter.iter.node = &ua_sess->node.node; | |
976 | ret = lttng_ht_del(app->sessions, &iter); | |
977 | if (ret) { | |
978 | /* Already scheduled for teardown. */ | |
979 | goto end; | |
980 | } | |
981 | ||
982 | /* Once deleted, free the data structure. */ | |
d0b96690 | 983 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
984 | |
985 | end: | |
986 | return; | |
987 | } | |
988 | ||
8b366481 DG |
989 | /* |
990 | * Alloc new UST app session. | |
991 | */ | |
992 | static | |
40bbd087 | 993 | struct ust_app_session *alloc_ust_app_session(void) |
8b366481 DG |
994 | { |
995 | struct ust_app_session *ua_sess; | |
996 | ||
997 | /* Init most of the default value by allocating and zeroing */ | |
998 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
999 | if (ua_sess == NULL) { | |
1000 | PERROR("malloc"); | |
ffe60014 | 1001 | goto error_free; |
8b366481 DG |
1002 | } |
1003 | ||
1004 | ua_sess->handle = -1; | |
bec39940 | 1005 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 1006 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 1007 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 1008 | |
8b366481 DG |
1009 | return ua_sess; |
1010 | ||
ffe60014 | 1011 | error_free: |
8b366481 DG |
1012 | return NULL; |
1013 | } | |
1014 | ||
1015 | /* | |
1016 | * Alloc new UST app channel. | |
1017 | */ | |
1018 | static | |
1019 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 1020 | struct ust_app_session *ua_sess, |
ffe60014 | 1021 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1022 | { |
1023 | struct ust_app_channel *ua_chan; | |
1024 | ||
1025 | /* Init most of the default value by allocating and zeroing */ | |
1026 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1027 | if (ua_chan == NULL) { | |
1028 | PERROR("malloc"); | |
1029 | goto error; | |
1030 | } | |
1031 | ||
1032 | /* Setup channel name */ | |
1033 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1034 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1035 | ||
1036 | ua_chan->enabled = 1; | |
1037 | ua_chan->handle = -1; | |
45893984 | 1038 | ua_chan->session = ua_sess; |
ffe60014 | 1039 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1040 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1041 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1042 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1043 | |
1044 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1045 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1046 | |
1047 | /* Copy attributes */ | |
1048 | if (attr) { | |
ffe60014 | 1049 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1050 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1051 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1052 | ua_chan->attr.overwrite = attr->overwrite; | |
1053 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1054 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1055 | ua_chan->attr.output = attr->output; | |
491d1539 | 1056 | ua_chan->attr.blocking_timeout = attr->u.s.blocking_timeout; |
8b366481 | 1057 | } |
ffe60014 DG |
1058 | /* By default, the channel is a per cpu channel. */ |
1059 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1060 | |
1061 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1062 | ||
1063 | return ua_chan; | |
1064 | ||
1065 | error: | |
1066 | return NULL; | |
1067 | } | |
1068 | ||
37f1c236 DG |
1069 | /* |
1070 | * Allocate and initialize a UST app stream. | |
1071 | * | |
1072 | * Return newly allocated stream pointer or NULL on error. | |
1073 | */ | |
ffe60014 | 1074 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1075 | { |
1076 | struct ust_app_stream *stream = NULL; | |
1077 | ||
1078 | stream = zmalloc(sizeof(*stream)); | |
1079 | if (stream == NULL) { | |
1080 | PERROR("zmalloc ust app stream"); | |
1081 | goto error; | |
1082 | } | |
1083 | ||
1084 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1085 | stream->handle = -1; | |
1086 | ||
1087 | error: | |
1088 | return stream; | |
1089 | } | |
1090 | ||
8b366481 DG |
1091 | /* |
1092 | * Alloc new UST app event. | |
1093 | */ | |
1094 | static | |
1095 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1096 | struct lttng_ust_event *attr) | |
1097 | { | |
1098 | struct ust_app_event *ua_event; | |
1099 | ||
1100 | /* Init most of the default value by allocating and zeroing */ | |
1101 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1102 | if (ua_event == NULL) { | |
1103 | PERROR("malloc"); | |
1104 | goto error; | |
1105 | } | |
1106 | ||
1107 | ua_event->enabled = 1; | |
1108 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1109 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1110 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1111 | |
1112 | /* Copy attributes */ | |
1113 | if (attr) { | |
1114 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1115 | } | |
1116 | ||
1117 | DBG3("UST app event %s allocated", ua_event->name); | |
1118 | ||
1119 | return ua_event; | |
1120 | ||
1121 | error: | |
1122 | return NULL; | |
1123 | } | |
1124 | ||
1125 | /* | |
1126 | * Alloc new UST app context. | |
1127 | */ | |
1128 | static | |
bdf64013 | 1129 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1130 | { |
1131 | struct ust_app_ctx *ua_ctx; | |
1132 | ||
1133 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1134 | if (ua_ctx == NULL) { | |
1135 | goto error; | |
1136 | } | |
1137 | ||
31746f93 DG |
1138 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1139 | ||
8b366481 DG |
1140 | if (uctx) { |
1141 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1142 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1143 | char *provider_name = NULL, *ctx_name = NULL; | |
1144 | ||
1145 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1146 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1147 | if (!provider_name || !ctx_name) { | |
1148 | free(provider_name); | |
1149 | free(ctx_name); | |
1150 | goto error; | |
1151 | } | |
1152 | ||
1153 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1154 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1155 | } | |
8b366481 DG |
1156 | } |
1157 | ||
1158 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1159 | return ua_ctx; |
bdf64013 JG |
1160 | error: |
1161 | free(ua_ctx); | |
1162 | return NULL; | |
8b366481 DG |
1163 | } |
1164 | ||
025faf73 DG |
1165 | /* |
1166 | * Allocate a filter and copy the given original filter. | |
1167 | * | |
1168 | * Return allocated filter or NULL on error. | |
1169 | */ | |
51755dc8 JG |
1170 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1171 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1172 | { |
51755dc8 | 1173 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1174 | |
1175 | /* Copy filter bytecode */ | |
1176 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1177 | if (!filter) { | |
51755dc8 | 1178 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1179 | goto error; |
1180 | } | |
1181 | ||
1182 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1183 | ||
1184 | error: | |
1185 | return filter; | |
1186 | } | |
1187 | ||
51755dc8 JG |
1188 | /* |
1189 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1190 | * | |
1191 | * Return allocated filter or NULL on error. | |
1192 | */ | |
1193 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1194 | struct lttng_filter_bytecode *orig_f) | |
1195 | { | |
1196 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1197 | ||
1198 | /* Copy filter bytecode */ | |
1199 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1200 | if (!filter) { | |
1201 | PERROR("zmalloc alloc ust filter bytecode"); | |
1202 | goto error; | |
1203 | } | |
1204 | ||
1205 | assert(sizeof(struct lttng_filter_bytecode) == | |
1206 | sizeof(struct lttng_ust_filter_bytecode)); | |
1207 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1208 | error: | |
1209 | return filter; | |
1210 | } | |
1211 | ||
099e26bd | 1212 | /* |
421cb601 DG |
1213 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1214 | * held before calling this helper function. | |
099e26bd | 1215 | */ |
f20baf8e | 1216 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1217 | { |
bec39940 | 1218 | struct lttng_ht_node_ulong *node; |
bec39940 | 1219 | struct lttng_ht_iter iter; |
f6a9efaa | 1220 | |
852d0037 | 1221 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1222 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1223 | if (node == NULL) { |
1224 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1225 | goto error; |
1226 | } | |
852d0037 DG |
1227 | |
1228 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1229 | |
1230 | error: | |
1231 | return NULL; | |
099e26bd DG |
1232 | } |
1233 | ||
d0b96690 DG |
1234 | /* |
1235 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1236 | * be held before calling this helper function. | |
1237 | */ | |
1238 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1239 | { | |
1240 | struct lttng_ht_node_ulong *node; | |
1241 | struct lttng_ht_iter iter; | |
1242 | ||
1243 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1244 | &iter); | |
1245 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1246 | if (node == NULL) { | |
1247 | DBG2("UST app find by notify sock %d not found", sock); | |
1248 | goto error; | |
1249 | } | |
1250 | ||
1251 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1252 | ||
1253 | error: | |
1254 | return NULL; | |
1255 | } | |
1256 | ||
025faf73 DG |
1257 | /* |
1258 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1259 | * event loglevel. | |
1260 | * | |
1261 | * Return an ust_app_event object or NULL on error. | |
1262 | */ | |
18eace3b | 1263 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
88e3c2f5 | 1264 | const char *name, const struct lttng_filter_bytecode *filter, |
2106efa0 | 1265 | int loglevel_value, |
39c5a3a7 | 1266 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1267 | { |
1268 | struct lttng_ht_iter iter; | |
1269 | struct lttng_ht_node_str *node; | |
1270 | struct ust_app_event *event = NULL; | |
1271 | struct ust_app_ht_key key; | |
18eace3b DG |
1272 | |
1273 | assert(name); | |
1274 | assert(ht); | |
1275 | ||
1276 | /* Setup key for event lookup. */ | |
1277 | key.name = name; | |
1278 | key.filter = filter; | |
2106efa0 | 1279 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1280 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1281 | key.exclusion = exclusion; |
18eace3b | 1282 | |
025faf73 DG |
1283 | /* Lookup using the event name as hash and a custom match fct. */ |
1284 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1285 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1286 | node = lttng_ht_iter_get_node_str(&iter); |
1287 | if (node == NULL) { | |
1288 | goto end; | |
1289 | } | |
1290 | ||
1291 | event = caa_container_of(node, struct ust_app_event, node); | |
1292 | ||
1293 | end: | |
18eace3b DG |
1294 | return event; |
1295 | } | |
1296 | ||
55cc08a6 DG |
1297 | /* |
1298 | * Create the channel context on the tracer. | |
d0b96690 DG |
1299 | * |
1300 | * Called with UST app session lock held. | |
55cc08a6 DG |
1301 | */ |
1302 | static | |
1303 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1304 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1305 | { | |
1306 | int ret; | |
1307 | ||
840cb59c | 1308 | health_code_update(); |
86acf0da | 1309 | |
fb45065e | 1310 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1311 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1312 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1313 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1314 | if (ret < 0) { |
ffe60014 DG |
1315 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1316 | ERR("UST app create channel context failed for app (pid: %d) " | |
1317 | "with ret %d", app->pid, ret); | |
1318 | } else { | |
3757b385 DG |
1319 | /* |
1320 | * This is normal behavior, an application can die during the | |
1321 | * creation process. Don't report an error so the execution can | |
1322 | * continue normally. | |
1323 | */ | |
1324 | ret = 0; | |
88e3c2f5 | 1325 | DBG3("UST app add context failed. Application is dead."); |
ffe60014 | 1326 | } |
55cc08a6 DG |
1327 | goto error; |
1328 | } | |
1329 | ||
1330 | ua_ctx->handle = ua_ctx->obj->handle; | |
1331 | ||
d0b96690 DG |
1332 | DBG2("UST app context handle %d created successfully for channel %s", |
1333 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1334 | |
1335 | error: | |
840cb59c | 1336 | health_code_update(); |
55cc08a6 DG |
1337 | return ret; |
1338 | } | |
1339 | ||
53a80697 MD |
1340 | /* |
1341 | * Set the filter on the tracer. | |
1342 | */ | |
1343 | static | |
1344 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1345 | struct ust_app *app) | |
1346 | { | |
1347 | int ret; | |
51755dc8 | 1348 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1349 | |
840cb59c | 1350 | health_code_update(); |
86acf0da | 1351 | |
53a80697 | 1352 | if (!ua_event->filter) { |
86acf0da DG |
1353 | ret = 0; |
1354 | goto error; | |
53a80697 MD |
1355 | } |
1356 | ||
51755dc8 JG |
1357 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1358 | if (!ust_bytecode) { | |
1359 | ret = -LTTNG_ERR_NOMEM; | |
1360 | goto error; | |
1361 | } | |
fb45065e | 1362 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1363 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1364 | ua_event->obj); |
fb45065e | 1365 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1366 | if (ret < 0) { |
ffe60014 DG |
1367 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1368 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1369 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1370 | } else { | |
3757b385 DG |
1371 | /* |
1372 | * This is normal behavior, an application can die during the | |
1373 | * creation process. Don't report an error so the execution can | |
1374 | * continue normally. | |
1375 | */ | |
1376 | ret = 0; | |
ffe60014 DG |
1377 | DBG3("UST app filter event failed. Application is dead."); |
1378 | } | |
53a80697 MD |
1379 | goto error; |
1380 | } | |
1381 | ||
1382 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1383 | ||
1384 | error: | |
840cb59c | 1385 | health_code_update(); |
51755dc8 | 1386 | free(ust_bytecode); |
53a80697 MD |
1387 | return ret; |
1388 | } | |
1389 | ||
51755dc8 JG |
1390 | static |
1391 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1392 | struct lttng_event_exclusion *exclusion) | |
1393 | { | |
1394 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1395 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1396 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1397 | ||
1398 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1399 | if (!ust_exclusion) { | |
1400 | PERROR("malloc"); | |
1401 | goto end; | |
1402 | } | |
1403 | ||
1404 | assert(sizeof(struct lttng_event_exclusion) == | |
1405 | sizeof(struct lttng_ust_event_exclusion)); | |
1406 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1407 | end: | |
1408 | return ust_exclusion; | |
1409 | } | |
1410 | ||
7cc9a73c JI |
1411 | /* |
1412 | * Set event exclusions on the tracer. | |
1413 | */ | |
1414 | static | |
1415 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1416 | struct ust_app *app) | |
1417 | { | |
1418 | int ret; | |
51755dc8 | 1419 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1420 | |
1421 | health_code_update(); | |
1422 | ||
1423 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1424 | ret = 0; | |
1425 | goto error; | |
1426 | } | |
1427 | ||
51755dc8 JG |
1428 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1429 | ua_event->exclusion); | |
1430 | if (!ust_exclusion) { | |
1431 | ret = -LTTNG_ERR_NOMEM; | |
1432 | goto error; | |
1433 | } | |
fb45065e | 1434 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1435 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1436 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1437 | if (ret < 0) { |
1438 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1439 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1440 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1441 | } else { | |
1442 | /* | |
1443 | * This is normal behavior, an application can die during the | |
1444 | * creation process. Don't report an error so the execution can | |
1445 | * continue normally. | |
1446 | */ | |
1447 | ret = 0; | |
1448 | DBG3("UST app event exclusion failed. Application is dead."); | |
1449 | } | |
1450 | goto error; | |
1451 | } | |
1452 | ||
1453 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1454 | ||
1455 | error: | |
1456 | health_code_update(); | |
51755dc8 | 1457 | free(ust_exclusion); |
7cc9a73c JI |
1458 | return ret; |
1459 | } | |
1460 | ||
9730260e DG |
1461 | /* |
1462 | * Disable the specified event on to UST tracer for the UST session. | |
1463 | */ | |
1464 | static int disable_ust_event(struct ust_app *app, | |
1465 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1466 | { | |
1467 | int ret; | |
1468 | ||
840cb59c | 1469 | health_code_update(); |
86acf0da | 1470 | |
fb45065e | 1471 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1472 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1473 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1474 | if (ret < 0) { |
ffe60014 DG |
1475 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1476 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1477 | "and session handle %d with ret %d", | |
1478 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1479 | } else { | |
3757b385 DG |
1480 | /* |
1481 | * This is normal behavior, an application can die during the | |
1482 | * creation process. Don't report an error so the execution can | |
1483 | * continue normally. | |
1484 | */ | |
1485 | ret = 0; | |
ffe60014 DG |
1486 | DBG3("UST app disable event failed. Application is dead."); |
1487 | } | |
9730260e DG |
1488 | goto error; |
1489 | } | |
1490 | ||
1491 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1492 | ua_event->attr.name, app->pid); |
9730260e DG |
1493 | |
1494 | error: | |
840cb59c | 1495 | health_code_update(); |
9730260e DG |
1496 | return ret; |
1497 | } | |
1498 | ||
78f0bacd DG |
1499 | /* |
1500 | * Disable the specified channel on to UST tracer for the UST session. | |
1501 | */ | |
1502 | static int disable_ust_channel(struct ust_app *app, | |
1503 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1504 | { | |
1505 | int ret; | |
1506 | ||
840cb59c | 1507 | health_code_update(); |
86acf0da | 1508 | |
fb45065e | 1509 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1510 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1511 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1512 | if (ret < 0) { |
ffe60014 DG |
1513 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1514 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1515 | "and session handle %d with ret %d", | |
1516 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1517 | } else { | |
3757b385 DG |
1518 | /* |
1519 | * This is normal behavior, an application can die during the | |
1520 | * creation process. Don't report an error so the execution can | |
1521 | * continue normally. | |
1522 | */ | |
1523 | ret = 0; | |
ffe60014 DG |
1524 | DBG3("UST app disable channel failed. Application is dead."); |
1525 | } | |
78f0bacd DG |
1526 | goto error; |
1527 | } | |
1528 | ||
78f0bacd | 1529 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1530 | ua_chan->name, app->pid); |
78f0bacd DG |
1531 | |
1532 | error: | |
840cb59c | 1533 | health_code_update(); |
78f0bacd DG |
1534 | return ret; |
1535 | } | |
1536 | ||
1537 | /* | |
1538 | * Enable the specified channel on to UST tracer for the UST session. | |
1539 | */ | |
1540 | static int enable_ust_channel(struct ust_app *app, | |
1541 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1542 | { | |
1543 | int ret; | |
1544 | ||
840cb59c | 1545 | health_code_update(); |
86acf0da | 1546 | |
fb45065e | 1547 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1548 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1549 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1550 | if (ret < 0) { |
ffe60014 DG |
1551 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1552 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1553 | "and session handle %d with ret %d", | |
1554 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1555 | } else { | |
3757b385 DG |
1556 | /* |
1557 | * This is normal behavior, an application can die during the | |
1558 | * creation process. Don't report an error so the execution can | |
1559 | * continue normally. | |
1560 | */ | |
1561 | ret = 0; | |
ffe60014 DG |
1562 | DBG3("UST app enable channel failed. Application is dead."); |
1563 | } | |
78f0bacd DG |
1564 | goto error; |
1565 | } | |
1566 | ||
1567 | ua_chan->enabled = 1; | |
1568 | ||
1569 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1570 | ua_chan->name, app->pid); |
78f0bacd DG |
1571 | |
1572 | error: | |
840cb59c | 1573 | health_code_update(); |
78f0bacd DG |
1574 | return ret; |
1575 | } | |
1576 | ||
edb67388 DG |
1577 | /* |
1578 | * Enable the specified event on to UST tracer for the UST session. | |
1579 | */ | |
1580 | static int enable_ust_event(struct ust_app *app, | |
1581 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1582 | { | |
1583 | int ret; | |
1584 | ||
840cb59c | 1585 | health_code_update(); |
86acf0da | 1586 | |
fb45065e | 1587 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1588 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1589 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1590 | if (ret < 0) { |
ffe60014 DG |
1591 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1592 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1593 | "and session handle %d with ret %d", | |
1594 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1595 | } else { | |
3757b385 DG |
1596 | /* |
1597 | * This is normal behavior, an application can die during the | |
1598 | * creation process. Don't report an error so the execution can | |
1599 | * continue normally. | |
1600 | */ | |
1601 | ret = 0; | |
ffe60014 DG |
1602 | DBG3("UST app enable event failed. Application is dead."); |
1603 | } | |
edb67388 DG |
1604 | goto error; |
1605 | } | |
1606 | ||
1607 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1608 | ua_event->attr.name, app->pid); |
edb67388 DG |
1609 | |
1610 | error: | |
840cb59c | 1611 | health_code_update(); |
edb67388 DG |
1612 | return ret; |
1613 | } | |
1614 | ||
099e26bd | 1615 | /* |
7972aab2 | 1616 | * Send channel and stream buffer to application. |
4f3ab6ee | 1617 | * |
ffe60014 | 1618 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1619 | */ |
7972aab2 DG |
1620 | static int send_channel_pid_to_ust(struct ust_app *app, |
1621 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1622 | { |
1623 | int ret; | |
ffe60014 | 1624 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1625 | |
1626 | assert(app); | |
ffe60014 | 1627 | assert(ua_sess); |
4f3ab6ee | 1628 | assert(ua_chan); |
4f3ab6ee | 1629 | |
840cb59c | 1630 | health_code_update(); |
4f3ab6ee | 1631 | |
7972aab2 DG |
1632 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1633 | app->sock); | |
86acf0da | 1634 | |
ffe60014 DG |
1635 | /* Send channel to the application. */ |
1636 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1637 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1638 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1639 | goto error; | |
1640 | } else if (ret < 0) { | |
b551a063 DG |
1641 | goto error; |
1642 | } | |
1643 | ||
d88aee68 DG |
1644 | health_code_update(); |
1645 | ||
ffe60014 DG |
1646 | /* Send all streams to application. */ |
1647 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1648 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1649 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1650 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1651 | goto error; | |
1652 | } else if (ret < 0) { | |
ffe60014 DG |
1653 | goto error; |
1654 | } | |
1655 | /* We don't need the stream anymore once sent to the tracer. */ | |
1656 | cds_list_del(&stream->list); | |
fb45065e | 1657 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1658 | } |
ffe60014 DG |
1659 | /* Flag the channel that it is sent to the application. */ |
1660 | ua_chan->is_sent = 1; | |
ffe60014 | 1661 | |
b551a063 | 1662 | error: |
840cb59c | 1663 | health_code_update(); |
b551a063 DG |
1664 | return ret; |
1665 | } | |
1666 | ||
91d76f53 | 1667 | /* |
5b4a0ec0 | 1668 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1669 | * |
1670 | * Should be called with session mutex held. | |
91d76f53 | 1671 | */ |
edb67388 DG |
1672 | static |
1673 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1674 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1675 | { |
5b4a0ec0 | 1676 | int ret = 0; |
284d8f55 | 1677 | |
840cb59c | 1678 | health_code_update(); |
86acf0da | 1679 | |
5b4a0ec0 | 1680 | /* Create UST event on tracer */ |
fb45065e | 1681 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1682 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1683 | &ua_event->obj); |
fb45065e | 1684 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1685 | if (ret < 0) { |
ffe60014 | 1686 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
88e3c2f5 | 1687 | abort(); |
ffe60014 DG |
1688 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
1689 | ua_event->attr.name, app->pid, ret); | |
1690 | } else { | |
3757b385 DG |
1691 | /* |
1692 | * This is normal behavior, an application can die during the | |
1693 | * creation process. Don't report an error so the execution can | |
1694 | * continue normally. | |
1695 | */ | |
1696 | ret = 0; | |
ffe60014 DG |
1697 | DBG3("UST app create event failed. Application is dead."); |
1698 | } | |
5b4a0ec0 | 1699 | goto error; |
91d76f53 | 1700 | } |
f6a9efaa | 1701 | |
5b4a0ec0 | 1702 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1703 | |
5b4a0ec0 | 1704 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1705 | ua_event->attr.name, app->pid); |
f6a9efaa | 1706 | |
840cb59c | 1707 | health_code_update(); |
86acf0da | 1708 | |
025faf73 DG |
1709 | /* Set filter if one is present. */ |
1710 | if (ua_event->filter) { | |
1711 | ret = set_ust_event_filter(ua_event, app); | |
1712 | if (ret < 0) { | |
1713 | goto error; | |
1714 | } | |
1715 | } | |
1716 | ||
7cc9a73c JI |
1717 | /* Set exclusions for the event */ |
1718 | if (ua_event->exclusion) { | |
1719 | ret = set_ust_event_exclusion(ua_event, app); | |
1720 | if (ret < 0) { | |
1721 | goto error; | |
1722 | } | |
1723 | } | |
1724 | ||
8535a6d9 | 1725 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1726 | if (ua_event->enabled) { |
1727 | /* | |
1728 | * We now need to explicitly enable the event, since it | |
1729 | * is now disabled at creation. | |
1730 | */ | |
1731 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1732 | if (ret < 0) { | |
1733 | /* | |
1734 | * If we hit an EPERM, something is wrong with our enable call. If | |
1735 | * we get an EEXIST, there is a problem on the tracer side since we | |
1736 | * just created it. | |
1737 | */ | |
1738 | switch (ret) { | |
1739 | case -LTTNG_UST_ERR_PERM: | |
1740 | /* Code flow problem */ | |
1741 | assert(0); | |
1742 | case -LTTNG_UST_ERR_EXIST: | |
1743 | /* It's OK for our use case. */ | |
1744 | ret = 0; | |
1745 | break; | |
1746 | default: | |
1747 | break; | |
1748 | } | |
1749 | goto error; | |
1750 | } | |
8535a6d9 DG |
1751 | } |
1752 | ||
5b4a0ec0 | 1753 | error: |
840cb59c | 1754 | health_code_update(); |
5b4a0ec0 | 1755 | return ret; |
91d76f53 | 1756 | } |
48842b30 | 1757 | |
5b4a0ec0 DG |
1758 | /* |
1759 | * Copy data between an UST app event and a LTT event. | |
1760 | */ | |
421cb601 | 1761 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1762 | struct ltt_ust_event *uevent) |
1763 | { | |
b4ffad32 JI |
1764 | size_t exclusion_alloc_size; |
1765 | ||
48842b30 DG |
1766 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1767 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1768 | ||
fc34caaa DG |
1769 | ua_event->enabled = uevent->enabled; |
1770 | ||
5b4a0ec0 DG |
1771 | /* Copy event attributes */ |
1772 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1773 | ||
53a80697 MD |
1774 | /* Copy filter bytecode */ |
1775 | if (uevent->filter) { | |
51755dc8 | 1776 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1777 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1778 | } |
b4ffad32 JI |
1779 | |
1780 | /* Copy exclusion data */ | |
1781 | if (uevent->exclusion) { | |
51755dc8 | 1782 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1783 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1784 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1785 | if (ua_event->exclusion == NULL) { |
1786 | PERROR("malloc"); | |
1787 | } else { | |
1788 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1789 | exclusion_alloc_size); | |
b4ffad32 JI |
1790 | } |
1791 | } | |
48842b30 DG |
1792 | } |
1793 | ||
5b4a0ec0 DG |
1794 | /* |
1795 | * Copy data between an UST app channel and a LTT channel. | |
1796 | */ | |
421cb601 | 1797 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1798 | struct ltt_ust_channel *uchan) |
1799 | { | |
fc34caaa | 1800 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1801 | |
1802 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1803 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1804 | |
1624d5b7 JD |
1805 | ua_chan->tracefile_size = uchan->tracefile_size; |
1806 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1807 | ||
ffe60014 DG |
1808 | /* Copy event attributes since the layout is different. */ |
1809 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1810 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1811 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1812 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1813 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
e9404c27 | 1814 | ua_chan->monitor_timer_interval = uchan->monitor_timer_interval; |
ffe60014 | 1815 | ua_chan->attr.output = uchan->attr.output; |
491d1539 MD |
1816 | ua_chan->attr.blocking_timeout = uchan->attr.u.s.blocking_timeout; |
1817 | ||
ffe60014 DG |
1818 | /* |
1819 | * Note that the attribute channel type is not set since the channel on the | |
1820 | * tracing registry side does not have this information. | |
1821 | */ | |
48842b30 | 1822 | |
fc34caaa | 1823 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1824 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1825 | |
fc34caaa | 1826 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1827 | } |
1828 | ||
5b4a0ec0 DG |
1829 | /* |
1830 | * Copy data between a UST app session and a regular LTT session. | |
1831 | */ | |
421cb601 | 1832 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1833 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1834 | { |
477d7741 MD |
1835 | time_t rawtime; |
1836 | struct tm *timeinfo; | |
1837 | char datetime[16]; | |
1838 | int ret; | |
d7ba1388 | 1839 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1840 | |
1841 | /* Get date and time for unique app path */ | |
1842 | time(&rawtime); | |
1843 | timeinfo = localtime(&rawtime); | |
1844 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1845 | |
421cb601 | 1846 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1847 | |
7972aab2 DG |
1848 | ua_sess->tracing_id = usess->id; |
1849 | ua_sess->id = get_next_session_id(); | |
470cc211 JG |
1850 | ua_sess->real_credentials.uid = app->uid; |
1851 | ua_sess->real_credentials.gid = app->gid; | |
1852 | ua_sess->effective_credentials.uid = usess->uid; | |
1853 | ua_sess->effective_credentials.gid = usess->gid; | |
7972aab2 DG |
1854 | ua_sess->buffer_type = usess->buffer_type; |
1855 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1856 | |
7972aab2 | 1857 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1858 | consumer_output_get(usess->consumer); |
7972aab2 | 1859 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1860 | |
2bba9e53 | 1861 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1862 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1863 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1864 | &usess->metadata_attr); | |
7972aab2 DG |
1865 | |
1866 | switch (ua_sess->buffer_type) { | |
1867 | case LTTNG_BUFFER_PER_PID: | |
1868 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1869 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1870 | datetime); |
1871 | break; | |
1872 | case LTTNG_BUFFER_PER_UID: | |
1873 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
470cc211 JG |
1874 | DEFAULT_UST_TRACE_UID_PATH, |
1875 | ua_sess->real_credentials.uid, | |
1876 | app->bits_per_long); | |
7972aab2 DG |
1877 | break; |
1878 | default: | |
1879 | assert(0); | |
1880 | goto error; | |
1881 | } | |
477d7741 MD |
1882 | if (ret < 0) { |
1883 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1884 | assert(0); |
7972aab2 | 1885 | goto error; |
477d7741 MD |
1886 | } |
1887 | ||
3d071855 MD |
1888 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1889 | sizeof(ua_sess->root_shm_path)); | |
1890 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1891 | strncpy(ua_sess->shm_path, usess->shm_path, |
1892 | sizeof(ua_sess->shm_path)); | |
1893 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1894 | if (ua_sess->shm_path[0]) { | |
1895 | switch (ua_sess->buffer_type) { | |
1896 | case LTTNG_BUFFER_PER_PID: | |
1897 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1898 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1899 | app->name, app->pid, datetime); | |
1900 | break; | |
1901 | case LTTNG_BUFFER_PER_UID: | |
1902 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1903 | DEFAULT_UST_TRACE_UID_PATH, | |
1904 | app->uid, app->bits_per_long); | |
1905 | break; | |
1906 | default: | |
1907 | assert(0); | |
1908 | goto error; | |
1909 | } | |
1910 | if (ret < 0) { | |
1911 | PERROR("sprintf UST shadow copy session"); | |
1912 | assert(0); | |
1913 | goto error; | |
1914 | } | |
1915 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1916 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1917 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1918 | } | |
6addfa37 | 1919 | return; |
7972aab2 DG |
1920 | |
1921 | error: | |
6addfa37 | 1922 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1923 | } |
1924 | ||
78f0bacd DG |
1925 | /* |
1926 | * Lookup sesison wrapper. | |
1927 | */ | |
84cd17c6 | 1928 | static |
fb9a95c4 | 1929 | void __lookup_session_by_app(const struct ltt_ust_session *usess, |
bec39940 | 1930 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1931 | { |
1932 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1933 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1934 | } |
1935 | ||
421cb601 DG |
1936 | /* |
1937 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1938 | * id. |
421cb601 | 1939 | */ |
48842b30 | 1940 | static struct ust_app_session *lookup_session_by_app( |
fb9a95c4 | 1941 | const struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1942 | { |
bec39940 | 1943 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1944 | struct lttng_ht_node_u64 *node; |
48842b30 | 1945 | |
84cd17c6 | 1946 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1947 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1948 | if (node == NULL) { |
1949 | goto error; | |
1950 | } | |
1951 | ||
1952 | return caa_container_of(node, struct ust_app_session, node); | |
1953 | ||
1954 | error: | |
1955 | return NULL; | |
1956 | } | |
1957 | ||
7972aab2 DG |
1958 | /* |
1959 | * Setup buffer registry per PID for the given session and application. If none | |
1960 | * is found, a new one is created, added to the global registry and | |
1961 | * initialized. If regp is valid, it's set with the newly created object. | |
1962 | * | |
1963 | * Return 0 on success or else a negative value. | |
1964 | */ | |
1965 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
1966 | struct ust_app *app, struct buffer_reg_pid **regp) | |
1967 | { | |
1968 | int ret = 0; | |
1969 | struct buffer_reg_pid *reg_pid; | |
1970 | ||
1971 | assert(ua_sess); | |
1972 | assert(app); | |
1973 | ||
1974 | rcu_read_lock(); | |
1975 | ||
1976 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
1977 | if (!reg_pid) { | |
1978 | /* | |
1979 | * This is the create channel path meaning that if there is NO | |
1980 | * registry available, we have to create one for this session. | |
1981 | */ | |
d7ba1388 | 1982 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 1983 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
1984 | if (ret < 0) { |
1985 | goto error; | |
1986 | } | |
7972aab2 DG |
1987 | } else { |
1988 | goto end; | |
1989 | } | |
1990 | ||
1991 | /* Initialize registry. */ | |
1992 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
1993 | app->bits_per_long, app->uint8_t_alignment, | |
1994 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf | 1995 | app->uint64_t_alignment, app->long_alignment, |
470cc211 JG |
1996 | app->byte_order, app->version.major, app->version.minor, |
1997 | reg_pid->root_shm_path, reg_pid->shm_path, | |
1998 | ua_sess->effective_credentials.uid, | |
1999 | ua_sess->effective_credentials.gid); | |
7972aab2 | 2000 | if (ret < 0) { |
286c991a MD |
2001 | /* |
2002 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2003 | * destroy the buffer registry, because it is always expected | |
2004 | * that if the buffer registry can be found, its ust registry is | |
2005 | * non-NULL. | |
2006 | */ | |
2007 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2008 | goto error; |
2009 | } | |
2010 | ||
286c991a MD |
2011 | buffer_reg_pid_add(reg_pid); |
2012 | ||
7972aab2 DG |
2013 | DBG3("UST app buffer registry per PID created successfully"); |
2014 | ||
2015 | end: | |
2016 | if (regp) { | |
2017 | *regp = reg_pid; | |
2018 | } | |
2019 | error: | |
2020 | rcu_read_unlock(); | |
2021 | return ret; | |
2022 | } | |
2023 | ||
2024 | /* | |
2025 | * Setup buffer registry per UID for the given session and application. If none | |
2026 | * is found, a new one is created, added to the global registry and | |
2027 | * initialized. If regp is valid, it's set with the newly created object. | |
2028 | * | |
2029 | * Return 0 on success or else a negative value. | |
2030 | */ | |
2031 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2032 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2033 | struct ust_app *app, struct buffer_reg_uid **regp) |
2034 | { | |
2035 | int ret = 0; | |
2036 | struct buffer_reg_uid *reg_uid; | |
2037 | ||
2038 | assert(usess); | |
2039 | assert(app); | |
2040 | ||
2041 | rcu_read_lock(); | |
2042 | ||
2043 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2044 | if (!reg_uid) { | |
2045 | /* | |
2046 | * This is the create channel path meaning that if there is NO | |
2047 | * registry available, we have to create one for this session. | |
2048 | */ | |
2049 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2050 | LTTNG_DOMAIN_UST, ®_uid, |
2051 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2052 | if (ret < 0) { |
2053 | goto error; | |
2054 | } | |
7972aab2 DG |
2055 | } else { |
2056 | goto end; | |
2057 | } | |
2058 | ||
2059 | /* Initialize registry. */ | |
af6142cf | 2060 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2061 | app->bits_per_long, app->uint8_t_alignment, |
2062 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2063 | app->uint64_t_alignment, app->long_alignment, |
2064 | app->byte_order, app->version.major, | |
3d071855 MD |
2065 | app->version.minor, reg_uid->root_shm_path, |
2066 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2067 | if (ret < 0) { |
286c991a MD |
2068 | /* |
2069 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2070 | * destroy the buffer registry, because it is always expected | |
2071 | * that if the buffer registry can be found, its ust registry is | |
2072 | * non-NULL. | |
2073 | */ | |
2074 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2075 | goto error; |
2076 | } | |
2077 | /* Add node to teardown list of the session. */ | |
2078 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2079 | ||
286c991a | 2080 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2081 | |
286c991a | 2082 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2083 | end: |
2084 | if (regp) { | |
2085 | *regp = reg_uid; | |
2086 | } | |
2087 | error: | |
2088 | rcu_read_unlock(); | |
2089 | return ret; | |
2090 | } | |
2091 | ||
421cb601 | 2092 | /* |
3d8ca23b | 2093 | * Create a session on the tracer side for the given app. |
421cb601 | 2094 | * |
3d8ca23b DG |
2095 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2096 | * untouched. If the session was created, is_created is set to 1. On error, | |
2097 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2098 | * be NULL. | |
2099 | * | |
2100 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2101 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2102 | */ |
03f91eaa | 2103 | static int find_or_create_ust_app_session(struct ltt_ust_session *usess, |
3d8ca23b DG |
2104 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, |
2105 | int *is_created) | |
421cb601 | 2106 | { |
3d8ca23b | 2107 | int ret, created = 0; |
421cb601 DG |
2108 | struct ust_app_session *ua_sess; |
2109 | ||
3d8ca23b DG |
2110 | assert(usess); |
2111 | assert(app); | |
2112 | assert(ua_sess_ptr); | |
2113 | ||
840cb59c | 2114 | health_code_update(); |
86acf0da | 2115 | |
421cb601 DG |
2116 | ua_sess = lookup_session_by_app(usess, app); |
2117 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2118 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2119 | app->pid, usess->id); |
40bbd087 | 2120 | ua_sess = alloc_ust_app_session(); |
421cb601 DG |
2121 | if (ua_sess == NULL) { |
2122 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2123 | ret = -ENOMEM; |
2124 | goto error; | |
421cb601 | 2125 | } |
477d7741 | 2126 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2127 | created = 1; |
421cb601 DG |
2128 | } |
2129 | ||
7972aab2 DG |
2130 | switch (usess->buffer_type) { |
2131 | case LTTNG_BUFFER_PER_PID: | |
2132 | /* Init local registry. */ | |
2133 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2134 | if (ret < 0) { |
e64207cf | 2135 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2136 | goto error; |
2137 | } | |
2138 | break; | |
2139 | case LTTNG_BUFFER_PER_UID: | |
2140 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2141 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2142 | if (ret < 0) { |
e64207cf | 2143 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2144 | goto error; |
2145 | } | |
2146 | break; | |
2147 | default: | |
2148 | assert(0); | |
2149 | ret = -EINVAL; | |
2150 | goto error; | |
2151 | } | |
2152 | ||
2153 | health_code_update(); | |
2154 | ||
2155 | if (ua_sess->handle == -1) { | |
fb45065e | 2156 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2157 | ret = ustctl_create_session(app->sock); |
fb45065e | 2158 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2159 | if (ret < 0) { |
2160 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2161 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2162 | app->pid, ret); |
2163 | } else { | |
2164 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2165 | /* |
2166 | * This is normal behavior, an application can die during the | |
2167 | * creation process. Don't report an error so the execution can | |
2168 | * continue normally. This will get flagged ENOTCONN and the | |
2169 | * caller will handle it. | |
2170 | */ | |
2171 | ret = 0; | |
ffe60014 | 2172 | } |
d0b96690 | 2173 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2174 | if (ret != -ENOMEM) { |
2175 | /* | |
2176 | * Tracer is probably gone or got an internal error so let's | |
2177 | * behave like it will soon unregister or not usable. | |
2178 | */ | |
2179 | ret = -ENOTCONN; | |
2180 | } | |
2181 | goto error; | |
421cb601 DG |
2182 | } |
2183 | ||
7972aab2 DG |
2184 | ua_sess->handle = ret; |
2185 | ||
2186 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2187 | lttng_ht_node_init_u64(&ua_sess->node, |
2188 | ua_sess->tracing_id); | |
2189 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2190 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2191 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2192 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2193 | |
2194 | DBG2("UST app session created successfully with handle %d", ret); | |
2195 | } | |
2196 | ||
2197 | *ua_sess_ptr = ua_sess; | |
2198 | if (is_created) { | |
2199 | *is_created = created; | |
2200 | } | |
2201 | ||
2202 | /* Everything went well. */ | |
2203 | ret = 0; | |
2204 | ||
2205 | error: | |
2206 | health_code_update(); | |
2207 | return ret; | |
2208 | } | |
2209 | ||
6a6b2068 JG |
2210 | /* |
2211 | * Match function for a hash table lookup of ust_app_ctx. | |
2212 | * | |
2213 | * It matches an ust app context based on the context type and, in the case | |
2214 | * of perf counters, their name. | |
2215 | */ | |
2216 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2217 | { | |
2218 | struct ust_app_ctx *ctx; | |
bdf64013 | 2219 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2220 | |
2221 | assert(node); | |
2222 | assert(_key); | |
2223 | ||
2224 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2225 | key = _key; | |
2226 | ||
2227 | /* Context type */ | |
2228 | if (ctx->ctx.ctx != key->ctx) { | |
2229 | goto no_match; | |
2230 | } | |
2231 | ||
bdf64013 JG |
2232 | switch(key->ctx) { |
2233 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2234 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2235 | ctx->ctx.u.perf_counter.name, |
2236 | sizeof(key->u.perf_counter.name))) { | |
2237 | goto no_match; | |
2238 | } | |
2239 | break; | |
2240 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2241 | if (strcmp(key->u.app_ctx.provider_name, | |
2242 | ctx->ctx.u.app_ctx.provider_name) || | |
2243 | strcmp(key->u.app_ctx.ctx_name, | |
2244 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2245 | goto no_match; |
2246 | } | |
bdf64013 JG |
2247 | break; |
2248 | default: | |
2249 | break; | |
6a6b2068 JG |
2250 | } |
2251 | ||
2252 | /* Match. */ | |
2253 | return 1; | |
2254 | ||
2255 | no_match: | |
2256 | return 0; | |
2257 | } | |
2258 | ||
2259 | /* | |
2260 | * Lookup for an ust app context from an lttng_ust_context. | |
2261 | * | |
be184a0f | 2262 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2263 | * Return an ust_app_ctx object or NULL on error. |
2264 | */ | |
2265 | static | |
2266 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2267 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2268 | { |
2269 | struct lttng_ht_iter iter; | |
2270 | struct lttng_ht_node_ulong *node; | |
2271 | struct ust_app_ctx *app_ctx = NULL; | |
2272 | ||
2273 | assert(uctx); | |
2274 | assert(ht); | |
2275 | ||
2276 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2277 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2278 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2279 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2280 | if (!node) { | |
2281 | goto end; | |
2282 | } | |
2283 | ||
2284 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2285 | ||
2286 | end: | |
2287 | return app_ctx; | |
2288 | } | |
2289 | ||
7972aab2 DG |
2290 | /* |
2291 | * Create a context for the channel on the tracer. | |
2292 | * | |
2293 | * Called with UST app session lock held and a RCU read side lock. | |
2294 | */ | |
2295 | static | |
c9edf082 | 2296 | int create_ust_app_channel_context(struct ust_app_channel *ua_chan, |
bdf64013 | 2297 | struct lttng_ust_context_attr *uctx, |
7972aab2 DG |
2298 | struct ust_app *app) |
2299 | { | |
2300 | int ret = 0; | |
7972aab2 DG |
2301 | struct ust_app_ctx *ua_ctx; |
2302 | ||
2303 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2304 | ||
6a6b2068 JG |
2305 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2306 | if (ua_ctx) { | |
7972aab2 DG |
2307 | ret = -EEXIST; |
2308 | goto error; | |
2309 | } | |
2310 | ||
2311 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2312 | if (ua_ctx == NULL) { | |
2313 | /* malloc failed */ | |
7682f304 | 2314 | ret = -ENOMEM; |
7972aab2 DG |
2315 | goto error; |
2316 | } | |
2317 | ||
2318 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2319 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2320 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2321 | |
2322 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2323 | if (ret < 0) { | |
2324 | goto error; | |
2325 | } | |
2326 | ||
2327 | error: | |
2328 | return ret; | |
2329 | } | |
2330 | ||
2331 | /* | |
2332 | * Enable on the tracer side a ust app event for the session and channel. | |
2333 | * | |
2334 | * Called with UST app session lock held. | |
2335 | */ | |
2336 | static | |
2337 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2338 | struct ust_app_event *ua_event, struct ust_app *app) | |
2339 | { | |
2340 | int ret; | |
2341 | ||
2342 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2343 | if (ret < 0) { | |
2344 | goto error; | |
2345 | } | |
2346 | ||
2347 | ua_event->enabled = 1; | |
2348 | ||
2349 | error: | |
2350 | return ret; | |
2351 | } | |
2352 | ||
2353 | /* | |
2354 | * Disable on the tracer side a ust app event for the session and channel. | |
2355 | */ | |
2356 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2357 | struct ust_app_event *ua_event, struct ust_app *app) | |
2358 | { | |
2359 | int ret; | |
2360 | ||
2361 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2362 | if (ret < 0) { | |
2363 | goto error; | |
2364 | } | |
2365 | ||
2366 | ua_event->enabled = 0; | |
2367 | ||
2368 | error: | |
2369 | return ret; | |
2370 | } | |
2371 | ||
2372 | /* | |
2373 | * Lookup ust app channel for session and disable it on the tracer side. | |
2374 | */ | |
2375 | static | |
2376 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2377 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2378 | { | |
2379 | int ret; | |
2380 | ||
2381 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2382 | if (ret < 0) { | |
2383 | goto error; | |
2384 | } | |
2385 | ||
2386 | ua_chan->enabled = 0; | |
2387 | ||
2388 | error: | |
2389 | return ret; | |
2390 | } | |
2391 | ||
2392 | /* | |
2393 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2394 | * MUST be called with a RCU read side lock acquired. | |
2395 | */ | |
2396 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2397 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2398 | { | |
2399 | int ret = 0; | |
2400 | struct lttng_ht_iter iter; | |
2401 | struct lttng_ht_node_str *ua_chan_node; | |
2402 | struct ust_app_channel *ua_chan; | |
2403 | ||
2404 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2405 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2406 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2407 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2408 | uchan->name, ua_sess->tracing_id); |
2409 | goto error; | |
2410 | } | |
2411 | ||
2412 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2413 | ||
2414 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2415 | if (ret < 0) { | |
2416 | goto error; | |
2417 | } | |
2418 | ||
2419 | error: | |
2420 | return ret; | |
2421 | } | |
2422 | ||
2423 | /* | |
2424 | * Ask the consumer to create a channel and get it if successful. | |
2425 | * | |
fad1ed2f JR |
2426 | * Called with UST app session lock held. |
2427 | * | |
7972aab2 DG |
2428 | * Return 0 on success or else a negative value. |
2429 | */ | |
2430 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2431 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
e098433c JG |
2432 | int bitness, struct ust_registry_session *registry, |
2433 | uint64_t trace_archive_id) | |
7972aab2 DG |
2434 | { |
2435 | int ret; | |
2436 | unsigned int nb_fd = 0; | |
2437 | struct consumer_socket *socket; | |
2438 | ||
2439 | assert(usess); | |
2440 | assert(ua_sess); | |
2441 | assert(ua_chan); | |
2442 | assert(registry); | |
2443 | ||
2444 | rcu_read_lock(); | |
2445 | health_code_update(); | |
2446 | ||
2447 | /* Get the right consumer socket for the application. */ | |
2448 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2449 | if (!socket) { | |
2450 | ret = -EINVAL; | |
2451 | goto error; | |
2452 | } | |
2453 | ||
2454 | health_code_update(); | |
2455 | ||
2456 | /* Need one fd for the channel. */ | |
2457 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2458 | if (ret < 0) { | |
2459 | ERR("Exhausted number of available FD upon create channel"); | |
2460 | goto error; | |
2461 | } | |
2462 | ||
2463 | /* | |
2464 | * Ask consumer to create channel. The consumer will return the number of | |
2465 | * stream we have to expect. | |
2466 | */ | |
2467 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
d2956687 | 2468 | registry, usess->current_trace_chunk); |
7972aab2 DG |
2469 | if (ret < 0) { |
2470 | goto error_ask; | |
2471 | } | |
2472 | ||
2473 | /* | |
2474 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2475 | * stream (2 being the default value here). | |
2476 | */ | |
2477 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2478 | ||
2479 | /* Reserve the amount of file descriptor we need. */ | |
2480 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2481 | if (ret < 0) { | |
2482 | ERR("Exhausted number of available FD upon create channel"); | |
2483 | goto error_fd_get_stream; | |
2484 | } | |
2485 | ||
2486 | health_code_update(); | |
2487 | ||
2488 | /* | |
2489 | * Now get the channel from the consumer. This call wil populate the stream | |
2490 | * list of that channel and set the ust objects. | |
2491 | */ | |
d9078d0c DG |
2492 | if (usess->consumer->enabled) { |
2493 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2494 | if (ret < 0) { | |
2495 | goto error_destroy; | |
2496 | } | |
7972aab2 DG |
2497 | } |
2498 | ||
2499 | rcu_read_unlock(); | |
2500 | return 0; | |
2501 | ||
2502 | error_destroy: | |
2503 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2504 | error_fd_get_stream: | |
2505 | /* | |
2506 | * Initiate a destroy channel on the consumer since we had an error | |
2507 | * handling it on our side. The return value is of no importance since we | |
2508 | * already have a ret value set by the previous error that we need to | |
2509 | * return. | |
2510 | */ | |
2511 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2512 | error_ask: | |
2513 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2514 | error: | |
2515 | health_code_update(); | |
2516 | rcu_read_unlock(); | |
2517 | return ret; | |
2518 | } | |
2519 | ||
2520 | /* | |
2521 | * Duplicate the ust data object of the ust app stream and save it in the | |
2522 | * buffer registry stream. | |
2523 | * | |
2524 | * Return 0 on success or else a negative value. | |
2525 | */ | |
2526 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2527 | struct ust_app_stream *stream) | |
2528 | { | |
2529 | int ret; | |
2530 | ||
2531 | assert(reg_stream); | |
2532 | assert(stream); | |
2533 | ||
2534 | /* Reserve the amount of file descriptor we need. */ | |
2535 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2536 | if (ret < 0) { | |
2537 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2538 | goto error; | |
2539 | } | |
2540 | ||
2541 | /* Duplicate object for stream once the original is in the registry. */ | |
2542 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2543 | reg_stream->obj.ust); | |
2544 | if (ret < 0) { | |
2545 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2546 | reg_stream->obj.ust, stream->obj, ret); | |
2547 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2548 | goto error; | |
2549 | } | |
2550 | stream->handle = stream->obj->handle; | |
2551 | ||
2552 | error: | |
2553 | return ret; | |
2554 | } | |
2555 | ||
2556 | /* | |
2557 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2558 | * buffer registry channel. | |
2559 | * | |
2560 | * Return 0 on success or else a negative value. | |
2561 | */ | |
2562 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2563 | struct ust_app_channel *ua_chan) | |
2564 | { | |
2565 | int ret; | |
2566 | ||
2567 | assert(reg_chan); | |
2568 | assert(ua_chan); | |
2569 | ||
2570 | /* Need two fds for the channel. */ | |
2571 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2572 | if (ret < 0) { | |
2573 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2574 | goto error_fd_get; | |
2575 | } | |
2576 | ||
2577 | /* Duplicate object for stream once the original is in the registry. */ | |
2578 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2579 | if (ret < 0) { | |
2580 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2581 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2582 | goto error; | |
2583 | } | |
2584 | ua_chan->handle = ua_chan->obj->handle; | |
2585 | ||
2586 | return 0; | |
2587 | ||
2588 | error: | |
2589 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2590 | error_fd_get: | |
2591 | return ret; | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * For a given channel buffer registry, setup all streams of the given ust | |
2596 | * application channel. | |
2597 | * | |
2598 | * Return 0 on success or else a negative value. | |
2599 | */ | |
2600 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2601 | struct ust_app_channel *ua_chan, |
2602 | struct ust_app *app) | |
7972aab2 DG |
2603 | { |
2604 | int ret = 0; | |
2605 | struct ust_app_stream *stream, *stmp; | |
2606 | ||
2607 | assert(reg_chan); | |
2608 | assert(ua_chan); | |
2609 | ||
2610 | DBG2("UST app setup buffer registry stream"); | |
2611 | ||
2612 | /* Send all streams to application. */ | |
2613 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2614 | struct buffer_reg_stream *reg_stream; | |
2615 | ||
2616 | ret = buffer_reg_stream_create(®_stream); | |
2617 | if (ret < 0) { | |
2618 | goto error; | |
2619 | } | |
2620 | ||
2621 | /* | |
2622 | * Keep original pointer and nullify it in the stream so the delete | |
2623 | * stream call does not release the object. | |
2624 | */ | |
2625 | reg_stream->obj.ust = stream->obj; | |
2626 | stream->obj = NULL; | |
2627 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2628 | |
7972aab2 DG |
2629 | /* We don't need the streams anymore. */ |
2630 | cds_list_del(&stream->list); | |
fb45065e | 2631 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2632 | } |
421cb601 | 2633 | |
7972aab2 DG |
2634 | error: |
2635 | return ret; | |
2636 | } | |
2637 | ||
2638 | /* | |
2639 | * Create a buffer registry channel for the given session registry and | |
2640 | * application channel object. If regp pointer is valid, it's set with the | |
2641 | * created object. Important, the created object is NOT added to the session | |
2642 | * registry hash table. | |
2643 | * | |
2644 | * Return 0 on success else a negative value. | |
2645 | */ | |
2646 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2647 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2648 | { | |
2649 | int ret; | |
2650 | struct buffer_reg_channel *reg_chan = NULL; | |
2651 | ||
2652 | assert(reg_sess); | |
2653 | assert(ua_chan); | |
2654 | ||
2655 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2656 | ||
2657 | /* Create buffer registry channel. */ | |
2658 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2659 | if (ret < 0) { | |
2660 | goto error_create; | |
421cb601 | 2661 | } |
7972aab2 DG |
2662 | assert(reg_chan); |
2663 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2664 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2665 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2666 | |
7972aab2 DG |
2667 | /* Create and add a channel registry to session. */ |
2668 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2669 | ua_chan->tracing_channel_id); | |
2670 | if (ret < 0) { | |
2671 | goto error; | |
d88aee68 | 2672 | } |
7972aab2 | 2673 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2674 | |
7972aab2 DG |
2675 | if (regp) { |
2676 | *regp = reg_chan; | |
3d8ca23b | 2677 | } |
d88aee68 | 2678 | |
7972aab2 | 2679 | return 0; |
3d8ca23b DG |
2680 | |
2681 | error: | |
7972aab2 DG |
2682 | /* Safe because the registry channel object was not added to any HT. */ |
2683 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2684 | error_create: | |
3d8ca23b | 2685 | return ret; |
421cb601 DG |
2686 | } |
2687 | ||
55cc08a6 | 2688 | /* |
7972aab2 DG |
2689 | * Setup buffer registry channel for the given session registry and application |
2690 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2691 | * |
7972aab2 | 2692 | * Return 0 on success else a negative value. |
55cc08a6 | 2693 | */ |
7972aab2 | 2694 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2695 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2696 | struct ust_app *app) | |
55cc08a6 | 2697 | { |
7972aab2 | 2698 | int ret; |
55cc08a6 | 2699 | |
7972aab2 DG |
2700 | assert(reg_sess); |
2701 | assert(reg_chan); | |
2702 | assert(ua_chan); | |
2703 | assert(ua_chan->obj); | |
55cc08a6 | 2704 | |
7972aab2 | 2705 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2706 | |
7972aab2 | 2707 | /* Setup all streams for the registry. */ |
fb45065e | 2708 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2709 | if (ret < 0) { |
55cc08a6 DG |
2710 | goto error; |
2711 | } | |
2712 | ||
7972aab2 DG |
2713 | reg_chan->obj.ust = ua_chan->obj; |
2714 | ua_chan->obj = NULL; | |
55cc08a6 | 2715 | |
7972aab2 | 2716 | return 0; |
55cc08a6 DG |
2717 | |
2718 | error: | |
7972aab2 DG |
2719 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2720 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2721 | return ret; |
2722 | } | |
2723 | ||
edb67388 | 2724 | /* |
7972aab2 | 2725 | * Send buffer registry channel to the application. |
d0b96690 | 2726 | * |
7972aab2 | 2727 | * Return 0 on success else a negative value. |
edb67388 | 2728 | */ |
7972aab2 DG |
2729 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2730 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2731 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2732 | { |
2733 | int ret; | |
7972aab2 | 2734 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2735 | |
7972aab2 DG |
2736 | assert(reg_chan); |
2737 | assert(app); | |
2738 | assert(ua_sess); | |
2739 | assert(ua_chan); | |
2740 | ||
2741 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2742 | ||
2743 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2744 | if (ret < 0) { |
2745 | goto error; | |
2746 | } | |
2747 | ||
7972aab2 DG |
2748 | /* Send channel to the application. */ |
2749 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2750 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2751 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2752 | goto error; | |
2753 | } else if (ret < 0) { | |
7972aab2 DG |
2754 | goto error; |
2755 | } | |
2756 | ||
2757 | health_code_update(); | |
2758 | ||
2759 | /* Send all streams to application. */ | |
2760 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2761 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2762 | struct ust_app_stream stream; | |
2763 | ||
2764 | ret = duplicate_stream_object(reg_stream, &stream); | |
2765 | if (ret < 0) { | |
2766 | goto error_stream_unlock; | |
2767 | } | |
2768 | ||
2769 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2770 | if (ret < 0) { | |
fb45065e | 2771 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2772 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2773 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2774 | } |
7972aab2 DG |
2775 | goto error_stream_unlock; |
2776 | } | |
edb67388 | 2777 | |
7972aab2 DG |
2778 | /* |
2779 | * The return value is not important here. This function will output an | |
2780 | * error if needed. | |
2781 | */ | |
fb45065e | 2782 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2783 | } |
2784 | ua_chan->is_sent = 1; | |
2785 | ||
2786 | error_stream_unlock: | |
2787 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2788 | error: |
2789 | return ret; | |
2790 | } | |
2791 | ||
9730260e | 2792 | /* |
7972aab2 DG |
2793 | * Create and send to the application the created buffers with per UID buffers. |
2794 | * | |
9acdc1d6 | 2795 | * This MUST be called with a RCU read side lock acquired. |
71e0a100 | 2796 | * The session list lock and the session's lock must be acquired. |
9acdc1d6 | 2797 | * |
7972aab2 | 2798 | * Return 0 on success else a negative value. |
9730260e | 2799 | */ |
7972aab2 DG |
2800 | static int create_channel_per_uid(struct ust_app *app, |
2801 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2802 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2803 | { |
2804 | int ret; | |
7972aab2 DG |
2805 | struct buffer_reg_uid *reg_uid; |
2806 | struct buffer_reg_channel *reg_chan; | |
e32d7f27 | 2807 | struct ltt_session *session = NULL; |
e098433c JG |
2808 | enum lttng_error_code notification_ret; |
2809 | struct ust_registry_channel *chan_reg; | |
9730260e | 2810 | |
7972aab2 DG |
2811 | assert(app); |
2812 | assert(usess); | |
2813 | assert(ua_sess); | |
2814 | assert(ua_chan); | |
2815 | ||
2816 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2817 | ||
2818 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2819 | /* | |
2820 | * The session creation handles the creation of this global registry | |
2821 | * object. If none can be find, there is a code flow problem or a | |
2822 | * teardown race. | |
2823 | */ | |
2824 | assert(reg_uid); | |
2825 | ||
2826 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2827 | reg_uid); | |
2721f7ea JG |
2828 | if (reg_chan) { |
2829 | goto send_channel; | |
2830 | } | |
7972aab2 | 2831 | |
2721f7ea JG |
2832 | /* Create the buffer registry channel object. */ |
2833 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2834 | if (ret < 0) { | |
2835 | ERR("Error creating the UST channel \"%s\" registry instance", | |
f14256d6 | 2836 | ua_chan->name); |
2721f7ea JG |
2837 | goto error; |
2838 | } | |
f14256d6 | 2839 | |
e098433c JG |
2840 | session = session_find_by_id(ua_sess->tracing_id); |
2841 | assert(session); | |
2842 | assert(pthread_mutex_trylock(&session->lock)); | |
2843 | assert(session_trylock_list()); | |
2844 | ||
2721f7ea JG |
2845 | /* |
2846 | * Create the buffers on the consumer side. This call populates the | |
2847 | * ust app channel object with all streams and data object. | |
2848 | */ | |
2849 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2850 | app->bits_per_long, reg_uid->registry->reg.ust, |
d2956687 | 2851 | session->most_recent_chunk_id.value); |
2721f7ea JG |
2852 | if (ret < 0) { |
2853 | ERR("Error creating UST channel \"%s\" on the consumer daemon", | |
2854 | ua_chan->name); | |
7972aab2 DG |
2855 | |
2856 | /* | |
2721f7ea JG |
2857 | * Let's remove the previously created buffer registry channel so |
2858 | * it's not visible anymore in the session registry. | |
7972aab2 | 2859 | */ |
2721f7ea JG |
2860 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, |
2861 | ua_chan->tracing_channel_id, false); | |
2862 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2863 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2864 | goto error; | |
7972aab2 DG |
2865 | } |
2866 | ||
2721f7ea JG |
2867 | /* |
2868 | * Setup the streams and add it to the session registry. | |
2869 | */ | |
2870 | ret = setup_buffer_reg_channel(reg_uid->registry, | |
2871 | ua_chan, reg_chan, app); | |
2872 | if (ret < 0) { | |
2873 | ERR("Error setting up UST channel \"%s\"", ua_chan->name); | |
2874 | goto error; | |
2875 | } | |
2876 | ||
e098433c JG |
2877 | /* Notify the notification subsystem of the channel's creation. */ |
2878 | pthread_mutex_lock(®_uid->registry->reg.ust->lock); | |
2879 | chan_reg = ust_registry_channel_find(reg_uid->registry->reg.ust, | |
2880 | ua_chan->tracing_channel_id); | |
2881 | assert(chan_reg); | |
2882 | chan_reg->consumer_key = ua_chan->key; | |
2883 | chan_reg = NULL; | |
2884 | pthread_mutex_unlock(®_uid->registry->reg.ust->lock); | |
e9404c27 | 2885 | |
e098433c JG |
2886 | notification_ret = notification_thread_command_add_channel( |
2887 | notification_thread_handle, session->name, | |
470cc211 JG |
2888 | ua_sess->effective_credentials.uid, |
2889 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2890 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e098433c JG |
2891 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
2892 | if (notification_ret != LTTNG_OK) { | |
2893 | ret = - (int) notification_ret; | |
2894 | ERR("Failed to add channel to notification thread"); | |
2895 | goto error; | |
e9404c27 JG |
2896 | } |
2897 | ||
2721f7ea | 2898 | send_channel: |
66ff8e3f JG |
2899 | /* Send buffers to the application. */ |
2900 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
2901 | if (ret < 0) { | |
2902 | if (ret != -ENOTCONN) { | |
2903 | ERR("Error sending channel to application"); | |
2904 | } | |
2905 | goto error; | |
2906 | } | |
2907 | ||
9730260e | 2908 | error: |
e32d7f27 JG |
2909 | if (session) { |
2910 | session_put(session); | |
2911 | } | |
9730260e DG |
2912 | return ret; |
2913 | } | |
2914 | ||
78f0bacd | 2915 | /* |
7972aab2 DG |
2916 | * Create and send to the application the created buffers with per PID buffers. |
2917 | * | |
fad1ed2f | 2918 | * Called with UST app session lock held. |
71e0a100 | 2919 | * The session list lock and the session's lock must be acquired. |
fad1ed2f | 2920 | * |
7972aab2 | 2921 | * Return 0 on success else a negative value. |
78f0bacd | 2922 | */ |
7972aab2 DG |
2923 | static int create_channel_per_pid(struct ust_app *app, |
2924 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2925 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2926 | { |
8535a6d9 | 2927 | int ret; |
7972aab2 | 2928 | struct ust_registry_session *registry; |
e9404c27 | 2929 | enum lttng_error_code cmd_ret; |
e32d7f27 | 2930 | struct ltt_session *session = NULL; |
e9404c27 JG |
2931 | uint64_t chan_reg_key; |
2932 | struct ust_registry_channel *chan_reg; | |
78f0bacd | 2933 | |
7972aab2 DG |
2934 | assert(app); |
2935 | assert(usess); | |
2936 | assert(ua_sess); | |
2937 | assert(ua_chan); | |
2938 | ||
2939 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2940 | ||
2941 | rcu_read_lock(); | |
2942 | ||
2943 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 2944 | /* The UST app session lock is held, registry shall not be null. */ |
7972aab2 DG |
2945 | assert(registry); |
2946 | ||
2947 | /* Create and add a new channel registry to session. */ | |
2948 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2949 | if (ret < 0) { |
f14256d6 MD |
2950 | ERR("Error creating the UST channel \"%s\" registry instance", |
2951 | ua_chan->name); | |
78f0bacd DG |
2952 | goto error; |
2953 | } | |
2954 | ||
e098433c JG |
2955 | session = session_find_by_id(ua_sess->tracing_id); |
2956 | assert(session); | |
2957 | ||
2958 | assert(pthread_mutex_trylock(&session->lock)); | |
2959 | assert(session_trylock_list()); | |
2960 | ||
7972aab2 DG |
2961 | /* Create and get channel on the consumer side. */ |
2962 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
e098433c | 2963 | app->bits_per_long, registry, |
d2956687 | 2964 | session->most_recent_chunk_id.value); |
7972aab2 | 2965 | if (ret < 0) { |
f14256d6 MD |
2966 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2967 | ua_chan->name); | |
5b951542 | 2968 | goto error_remove_from_registry; |
7972aab2 DG |
2969 | } |
2970 | ||
2971 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2972 | if (ret < 0) { | |
a7169585 MD |
2973 | if (ret != -ENOTCONN) { |
2974 | ERR("Error sending channel to application"); | |
2975 | } | |
5b951542 | 2976 | goto error_remove_from_registry; |
7972aab2 | 2977 | } |
8535a6d9 | 2978 | |
e9404c27 JG |
2979 | chan_reg_key = ua_chan->key; |
2980 | pthread_mutex_lock(®istry->lock); | |
2981 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
2982 | assert(chan_reg); | |
2983 | chan_reg->consumer_key = ua_chan->key; | |
2984 | pthread_mutex_unlock(®istry->lock); | |
2985 | ||
2986 | cmd_ret = notification_thread_command_add_channel( | |
2987 | notification_thread_handle, session->name, | |
470cc211 JG |
2988 | ua_sess->effective_credentials.uid, |
2989 | ua_sess->effective_credentials.gid, ua_chan->name, | |
2990 | ua_chan->key, LTTNG_DOMAIN_UST, | |
e9404c27 JG |
2991 | ua_chan->attr.subbuf_size * ua_chan->attr.num_subbuf); |
2992 | if (cmd_ret != LTTNG_OK) { | |
2993 | ret = - (int) cmd_ret; | |
2994 | ERR("Failed to add channel to notification thread"); | |
5b951542 | 2995 | goto error_remove_from_registry; |
e9404c27 JG |
2996 | } |
2997 | ||
5b951542 MD |
2998 | error_remove_from_registry: |
2999 | if (ret) { | |
3000 | ust_registry_channel_del_free(registry, ua_chan->key, false); | |
3001 | } | |
78f0bacd | 3002 | error: |
7972aab2 | 3003 | rcu_read_unlock(); |
e32d7f27 JG |
3004 | if (session) { |
3005 | session_put(session); | |
3006 | } | |
78f0bacd DG |
3007 | return ret; |
3008 | } | |
3009 | ||
3010 | /* | |
7972aab2 | 3011 | * From an already allocated ust app channel, create the channel buffers if |
88e3c2f5 | 3012 | * needed and send them to the application. This MUST be called with a RCU read |
7972aab2 DG |
3013 | * side lock acquired. |
3014 | * | |
fad1ed2f JR |
3015 | * Called with UST app session lock held. |
3016 | * | |
a7169585 MD |
3017 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3018 | * the application exited concurrently. | |
78f0bacd | 3019 | */ |
88e3c2f5 | 3020 | static int ust_app_channel_send(struct ust_app *app, |
7972aab2 DG |
3021 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, |
3022 | struct ust_app_channel *ua_chan) | |
78f0bacd | 3023 | { |
7972aab2 | 3024 | int ret; |
78f0bacd | 3025 | |
7972aab2 DG |
3026 | assert(app); |
3027 | assert(usess); | |
88e3c2f5 | 3028 | assert(usess->active); |
7972aab2 DG |
3029 | assert(ua_sess); |
3030 | assert(ua_chan); | |
3031 | ||
3032 | /* Handle buffer type before sending the channel to the application. */ | |
3033 | switch (usess->buffer_type) { | |
3034 | case LTTNG_BUFFER_PER_UID: | |
3035 | { | |
3036 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
3037 | if (ret < 0) { | |
3038 | goto error; | |
3039 | } | |
3040 | break; | |
3041 | } | |
3042 | case LTTNG_BUFFER_PER_PID: | |
3043 | { | |
3044 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3045 | if (ret < 0) { | |
3046 | goto error; | |
3047 | } | |
3048 | break; | |
3049 | } | |
3050 | default: | |
3051 | assert(0); | |
3052 | ret = -EINVAL; | |
78f0bacd DG |
3053 | goto error; |
3054 | } | |
3055 | ||
7972aab2 DG |
3056 | /* Initialize ust objd object using the received handle and add it. */ |
3057 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3058 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3059 | |
7972aab2 DG |
3060 | /* If channel is not enabled, disable it on the tracer */ |
3061 | if (!ua_chan->enabled) { | |
3062 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3063 | if (ret < 0) { | |
3064 | goto error; | |
3065 | } | |
78f0bacd DG |
3066 | } |
3067 | ||
3068 | error: | |
3069 | return ret; | |
3070 | } | |
3071 | ||
284d8f55 | 3072 | /* |
88e3c2f5 | 3073 | * Create UST app channel and return it through ua_chanp if not NULL. |
d0b96690 | 3074 | * |
36b588ed | 3075 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3076 | * |
88e3c2f5 | 3077 | * Return 0 on success or else a negative value. |
284d8f55 | 3078 | */ |
88e3c2f5 JG |
3079 | static int ust_app_channel_allocate(struct ust_app_session *ua_sess, |
3080 | struct ltt_ust_channel *uchan, | |
7972aab2 | 3081 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3082 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3083 | { |
3084 | int ret = 0; | |
bec39940 DG |
3085 | struct lttng_ht_iter iter; |
3086 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3087 | struct ust_app_channel *ua_chan; |
3088 | ||
3089 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3090 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3091 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3092 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3093 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3094 | goto end; |
5b4a0ec0 DG |
3095 | } |
3096 | ||
d0b96690 | 3097 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3098 | if (ua_chan == NULL) { |
3099 | /* Only malloc can fail here */ | |
4d710ac2 | 3100 | ret = -ENOMEM; |
88e3c2f5 | 3101 | goto error; |
fc34caaa DG |
3102 | } |
3103 | shadow_copy_channel(ua_chan, uchan); | |
3104 | ||
ffe60014 DG |
3105 | /* Set channel type. */ |
3106 | ua_chan->attr.type = type; | |
3107 | ||
d0b96690 DG |
3108 | /* Only add the channel if successful on the tracer side. */ |
3109 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
fc34caaa | 3110 | end: |
4d710ac2 DG |
3111 | if (ua_chanp) { |
3112 | *ua_chanp = ua_chan; | |
3113 | } | |
3114 | ||
3115 | /* Everything went well. */ | |
3116 | return 0; | |
5b4a0ec0 DG |
3117 | |
3118 | error: | |
4d710ac2 | 3119 | return ret; |
5b4a0ec0 DG |
3120 | } |
3121 | ||
3122 | /* | |
3123 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3124 | * |
3125 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3126 | */ |
edb67388 DG |
3127 | static |
3128 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3129 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3130 | struct ust_app *app) | |
284d8f55 | 3131 | { |
edb67388 | 3132 | int ret = 0; |
5b4a0ec0 | 3133 | struct ust_app_event *ua_event; |
284d8f55 | 3134 | |
edb67388 DG |
3135 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
3136 | if (ua_event == NULL) { | |
3137 | /* Only malloc can failed so something is really wrong */ | |
3138 | ret = -ENOMEM; | |
fc34caaa | 3139 | goto end; |
5b4a0ec0 | 3140 | } |
edb67388 | 3141 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3142 | |
edb67388 | 3143 | /* Create it on the tracer side */ |
5b4a0ec0 | 3144 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3145 | if (ret < 0) { |
fc34caaa | 3146 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3147 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3148 | goto error; |
3149 | } | |
3150 | ||
d0b96690 | 3151 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3152 | |
fc34caaa | 3153 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3154 | app->pid); |
7f79d3a1 | 3155 | |
edb67388 | 3156 | end: |
fc34caaa DG |
3157 | return ret; |
3158 | ||
5b4a0ec0 | 3159 | error: |
fc34caaa | 3160 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3161 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3162 | return ret; |
5b4a0ec0 DG |
3163 | } |
3164 | ||
3165 | /* | |
3166 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3167 | * |
7972aab2 | 3168 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3169 | */ |
3170 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3171 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3172 | { |
3173 | int ret = 0; | |
ffe60014 | 3174 | struct ust_app_channel *metadata; |
d88aee68 | 3175 | struct consumer_socket *socket; |
7972aab2 | 3176 | struct ust_registry_session *registry; |
e32d7f27 | 3177 | struct ltt_session *session = NULL; |
5b4a0ec0 | 3178 | |
ffe60014 DG |
3179 | assert(ua_sess); |
3180 | assert(app); | |
d88aee68 | 3181 | assert(consumer); |
5b4a0ec0 | 3182 | |
7972aab2 | 3183 | registry = get_session_registry(ua_sess); |
fad1ed2f | 3184 | /* The UST app session is held registry shall not be null. */ |
7972aab2 DG |
3185 | assert(registry); |
3186 | ||
ce34fcd0 MD |
3187 | pthread_mutex_lock(®istry->lock); |
3188 | ||
1b532a60 DG |
3189 | /* Metadata already exists for this registry or it was closed previously */ |
3190 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3191 | ret = 0; |
3192 | goto error; | |
5b4a0ec0 DG |
3193 | } |
3194 | ||
ffe60014 | 3195 | /* Allocate UST metadata */ |
d0b96690 | 3196 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3197 | if (!metadata) { |
3198 | /* malloc() failed */ | |
3199 | ret = -ENOMEM; | |
3200 | goto error; | |
3201 | } | |
5b4a0ec0 | 3202 | |
ad7a9107 | 3203 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3204 | |
7972aab2 DG |
3205 | /* Need one fd for the channel. */ |
3206 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3207 | if (ret < 0) { | |
3208 | ERR("Exhausted number of available FD upon create metadata"); | |
3209 | goto error; | |
3210 | } | |
3211 | ||
4dc3dfc5 DG |
3212 | /* Get the right consumer socket for the application. */ |
3213 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3214 | if (!socket) { | |
3215 | ret = -EINVAL; | |
3216 | goto error_consumer; | |
3217 | } | |
3218 | ||
331744e3 JD |
3219 | /* |
3220 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3221 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3222 | * consumer requesting the metadata and the ask_channel call on our side | |
3223 | * did not returned yet. | |
3224 | */ | |
3225 | registry->metadata_key = metadata->key; | |
3226 | ||
e098433c JG |
3227 | session = session_find_by_id(ua_sess->tracing_id); |
3228 | assert(session); | |
3229 | ||
3230 | assert(pthread_mutex_trylock(&session->lock)); | |
3231 | assert(session_trylock_list()); | |
3232 | ||
d88aee68 DG |
3233 | /* |
3234 | * Ask the metadata channel creation to the consumer. The metadata object | |
3235 | * will be created by the consumer and kept their. However, the stream is | |
3236 | * never added or monitored until we do a first push metadata to the | |
3237 | * consumer. | |
3238 | */ | |
7972aab2 | 3239 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
d2956687 | 3240 | registry, session->current_trace_chunk); |
d88aee68 | 3241 | if (ret < 0) { |
f2a444f1 DG |
3242 | /* Nullify the metadata key so we don't try to close it later on. */ |
3243 | registry->metadata_key = 0; | |
d88aee68 DG |
3244 | goto error_consumer; |
3245 | } | |
3246 | ||
3247 | /* | |
3248 | * The setup command will make the metadata stream be sent to the relayd, | |
3249 | * if applicable, and the thread managing the metadatas. This is important | |
3250 | * because after this point, if an error occurs, the only way the stream | |
3251 | * can be deleted is to be monitored in the consumer. | |
3252 | */ | |
7972aab2 | 3253 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3254 | if (ret < 0) { |
f2a444f1 DG |
3255 | /* Nullify the metadata key so we don't try to close it later on. */ |
3256 | registry->metadata_key = 0; | |
d88aee68 | 3257 | goto error_consumer; |
5b4a0ec0 DG |
3258 | } |
3259 | ||
7972aab2 DG |
3260 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3261 | metadata->key, app->pid); | |
5b4a0ec0 | 3262 | |
d88aee68 | 3263 | error_consumer: |
b80f0b6c | 3264 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3265 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3266 | error: |
ce34fcd0 | 3267 | pthread_mutex_unlock(®istry->lock); |
e32d7f27 JG |
3268 | if (session) { |
3269 | session_put(session); | |
3270 | } | |
ffe60014 | 3271 | return ret; |
5b4a0ec0 DG |
3272 | } |
3273 | ||
5b4a0ec0 | 3274 | /* |
d88aee68 DG |
3275 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3276 | * acquired before calling this function. | |
5b4a0ec0 DG |
3277 | */ |
3278 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3279 | { | |
d88aee68 | 3280 | struct ust_app *app = NULL; |
bec39940 DG |
3281 | struct lttng_ht_node_ulong *node; |
3282 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3283 | |
bec39940 DG |
3284 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3285 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3286 | if (node == NULL) { |
3287 | DBG2("UST app no found with pid %d", pid); | |
3288 | goto error; | |
3289 | } | |
5b4a0ec0 DG |
3290 | |
3291 | DBG2("Found UST app by pid %d", pid); | |
3292 | ||
d88aee68 | 3293 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3294 | |
3295 | error: | |
d88aee68 | 3296 | return app; |
5b4a0ec0 DG |
3297 | } |
3298 | ||
d88aee68 DG |
3299 | /* |
3300 | * Allocate and init an UST app object using the registration information and | |
3301 | * the command socket. This is called when the command socket connects to the | |
3302 | * session daemon. | |
3303 | * | |
3304 | * The object is returned on success or else NULL. | |
3305 | */ | |
d0b96690 | 3306 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3307 | { |
d0b96690 DG |
3308 | struct ust_app *lta = NULL; |
3309 | ||
3310 | assert(msg); | |
3311 | assert(sock >= 0); | |
3312 | ||
3313 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3314 | |
173af62f DG |
3315 | if ((msg->bits_per_long == 64 && |
3316 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3317 | || (msg->bits_per_long == 32 && | |
3318 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3319 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3320 | "%d-bit long, but no consumerd for this size is available.\n", |
3321 | msg->name, msg->pid, msg->bits_per_long); | |
3322 | goto error; | |
3f2c5fcc | 3323 | } |
d0b96690 | 3324 | |
5b4a0ec0 DG |
3325 | lta = zmalloc(sizeof(struct ust_app)); |
3326 | if (lta == NULL) { | |
3327 | PERROR("malloc"); | |
d0b96690 | 3328 | goto error; |
5b4a0ec0 DG |
3329 | } |
3330 | ||
3331 | lta->ppid = msg->ppid; | |
3332 | lta->uid = msg->uid; | |
3333 | lta->gid = msg->gid; | |
d0b96690 | 3334 | |
7753dea8 | 3335 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3336 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3337 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3338 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3339 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3340 | lta->long_alignment = msg->long_alignment; | |
3341 | lta->byte_order = msg->byte_order; | |
3342 | ||
5b4a0ec0 DG |
3343 | lta->v_major = msg->major; |
3344 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3345 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3346 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3347 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3348 | lta->notify_sock = -1; |
d88aee68 DG |
3349 | |
3350 | /* Copy name and make sure it's NULL terminated. */ | |
3351 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3352 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3353 | ||
3354 | /* | |
3355 | * Before this can be called, when receiving the registration information, | |
3356 | * the application compatibility is checked. So, at this point, the | |
3357 | * application can work with this session daemon. | |
3358 | */ | |
d0b96690 | 3359 | lta->compatible = 1; |
5b4a0ec0 | 3360 | |
852d0037 | 3361 | lta->pid = msg->pid; |
d0b96690 | 3362 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3363 | lta->sock = sock; |
fb45065e | 3364 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3365 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3366 | |
d42f20df | 3367 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3368 | error: |
3369 | return lta; | |
3370 | } | |
3371 | ||
d88aee68 DG |
3372 | /* |
3373 | * For a given application object, add it to every hash table. | |
3374 | */ | |
d0b96690 DG |
3375 | void ust_app_add(struct ust_app *app) |
3376 | { | |
3377 | assert(app); | |
3378 | assert(app->notify_sock >= 0); | |
3379 | ||
5b4a0ec0 | 3380 | rcu_read_lock(); |
852d0037 DG |
3381 | |
3382 | /* | |
3383 | * On a re-registration, we want to kick out the previous registration of | |
3384 | * that pid | |
3385 | */ | |
d0b96690 | 3386 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3387 | |
3388 | /* | |
3389 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3390 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3391 | * already in the table. | |
3392 | */ | |
d0b96690 | 3393 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3394 | |
d0b96690 DG |
3395 | /* Add application to the notify socket hash table. */ |
3396 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3397 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3398 | |
d0b96690 | 3399 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3400 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3401 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3402 | app->v_minor); | |
5b4a0ec0 | 3403 | |
d0b96690 DG |
3404 | rcu_read_unlock(); |
3405 | } | |
3406 | ||
d88aee68 DG |
3407 | /* |
3408 | * Set the application version into the object. | |
3409 | * | |
3410 | * Return 0 on success else a negative value either an errno code or a | |
3411 | * LTTng-UST error code. | |
3412 | */ | |
d0b96690 DG |
3413 | int ust_app_version(struct ust_app *app) |
3414 | { | |
d88aee68 DG |
3415 | int ret; |
3416 | ||
d0b96690 | 3417 | assert(app); |
d88aee68 | 3418 | |
fb45065e | 3419 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3420 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3421 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3422 | if (ret < 0) { |
3423 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3424 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3425 | } else { |
5368d366 | 3426 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3427 | } |
3428 | } | |
3429 | ||
3430 | return ret; | |
5b4a0ec0 DG |
3431 | } |
3432 | ||
3433 | /* | |
3434 | * Unregister app by removing it from the global traceable app list and freeing | |
3435 | * the data struct. | |
3436 | * | |
3437 | * The socket is already closed at this point so no close to sock. | |
3438 | */ | |
3439 | void ust_app_unregister(int sock) | |
3440 | { | |
3441 | struct ust_app *lta; | |
bec39940 | 3442 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3443 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3444 | struct lttng_ht_iter iter; |
d42f20df | 3445 | struct ust_app_session *ua_sess; |
525b0740 | 3446 | int ret; |
5b4a0ec0 DG |
3447 | |
3448 | rcu_read_lock(); | |
886459c6 | 3449 | |
5b4a0ec0 | 3450 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3451 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3452 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3453 | assert(node); |
284d8f55 | 3454 | |
852d0037 | 3455 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3456 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3457 | ||
d88aee68 | 3458 | /* |
ce34fcd0 MD |
3459 | * For per-PID buffers, perform "push metadata" and flush all |
3460 | * application streams before removing app from hash tables, | |
3461 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3462 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3463 | */ |
d42f20df DG |
3464 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3465 | node.node) { | |
7972aab2 DG |
3466 | struct ust_registry_session *registry; |
3467 | ||
d42f20df DG |
3468 | ret = lttng_ht_del(lta->sessions, &iter); |
3469 | if (ret) { | |
3470 | /* The session was already removed so scheduled for teardown. */ | |
3471 | continue; | |
3472 | } | |
3473 | ||
ce34fcd0 MD |
3474 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3475 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3476 | } | |
c4b88406 | 3477 | |
d42f20df DG |
3478 | /* |
3479 | * Add session to list for teardown. This is safe since at this point we | |
3480 | * are the only one using this list. | |
3481 | */ | |
d88aee68 DG |
3482 | pthread_mutex_lock(&ua_sess->lock); |
3483 | ||
b161602a MD |
3484 | if (ua_sess->deleted) { |
3485 | pthread_mutex_unlock(&ua_sess->lock); | |
3486 | continue; | |
3487 | } | |
3488 | ||
d88aee68 DG |
3489 | /* |
3490 | * Normally, this is done in the delete session process which is | |
3491 | * executed in the call rcu below. However, upon registration we can't | |
3492 | * afford to wait for the grace period before pushing data or else the | |
3493 | * data pending feature can race between the unregistration and stop | |
3494 | * command where the data pending command is sent *before* the grace | |
3495 | * period ended. | |
3496 | * | |
3497 | * The close metadata below nullifies the metadata pointer in the | |
3498 | * session so the delete session will NOT push/close a second time. | |
3499 | */ | |
7972aab2 | 3500 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3501 | if (registry) { |
7972aab2 DG |
3502 | /* Push metadata for application before freeing the application. */ |
3503 | (void) push_metadata(registry, ua_sess->consumer); | |
3504 | ||
3505 | /* | |
3506 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3507 | * metadata only on destroy trace session in this case. Also, the |
3508 | * previous push metadata could have flag the metadata registry to | |
3509 | * close so don't send a close command if closed. | |
7972aab2 | 3510 | */ |
ce34fcd0 | 3511 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3512 | /* And ask to close it for this session registry. */ |
3513 | (void) close_metadata(registry, ua_sess->consumer); | |
3514 | } | |
3515 | } | |
d42f20df | 3516 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3517 | |
d88aee68 | 3518 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3519 | } |
3520 | ||
c4b88406 MD |
3521 | /* Remove application from PID hash table */ |
3522 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3523 | assert(!ret); | |
3524 | ||
3525 | /* | |
3526 | * Remove application from notify hash table. The thread handling the | |
3527 | * notify socket could have deleted the node so ignore on error because | |
c48239ca JG |
3528 | * either way it's valid. The close of that socket is handled by the |
3529 | * apps_notify_thread. | |
c4b88406 MD |
3530 | */ |
3531 | iter.iter.node = <a->notify_sock_n.node; | |
3532 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3533 | ||
3534 | /* | |
3535 | * Ignore return value since the node might have been removed before by an | |
3536 | * add replace during app registration because the PID can be reassigned by | |
3537 | * the OS. | |
3538 | */ | |
3539 | iter.iter.node = <a->pid_n.node; | |
3540 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3541 | if (ret) { | |
3542 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3543 | lta->pid); | |
3544 | } | |
3545 | ||
852d0037 DG |
3546 | /* Free memory */ |
3547 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3548 | ||
5b4a0ec0 DG |
3549 | rcu_read_unlock(); |
3550 | return; | |
284d8f55 DG |
3551 | } |
3552 | ||
5b4a0ec0 DG |
3553 | /* |
3554 | * Fill events array with all events name of all registered apps. | |
3555 | */ | |
3556 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3557 | { |
5b4a0ec0 DG |
3558 | int ret, handle; |
3559 | size_t nbmem, count = 0; | |
bec39940 | 3560 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3561 | struct ust_app *app; |
c617c0c6 | 3562 | struct lttng_event *tmp_event; |
421cb601 | 3563 | |
5b4a0ec0 | 3564 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3565 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3566 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3567 | PERROR("zmalloc ust app events"); |
3568 | ret = -ENOMEM; | |
421cb601 DG |
3569 | goto error; |
3570 | } | |
3571 | ||
5b4a0ec0 | 3572 | rcu_read_lock(); |
421cb601 | 3573 | |
852d0037 | 3574 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3575 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3576 | |
840cb59c | 3577 | health_code_update(); |
86acf0da | 3578 | |
e0c7ec2b DG |
3579 | if (!app->compatible) { |
3580 | /* | |
3581 | * TODO: In time, we should notice the caller of this error by | |
3582 | * telling him that this is a version error. | |
3583 | */ | |
3584 | continue; | |
3585 | } | |
fb45065e | 3586 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3587 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3588 | if (handle < 0) { |
ffe60014 DG |
3589 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3590 | ERR("UST app list events getting handle failed for app pid %d", | |
3591 | app->pid); | |
3592 | } | |
fb45065e | 3593 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3594 | continue; |
3595 | } | |
421cb601 | 3596 | |
852d0037 | 3597 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3598 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3599 | /* Handle ustctl error. */ |
3600 | if (ret < 0) { | |
fb45065e MD |
3601 | int release_ret; |
3602 | ||
a2ba1ab0 | 3603 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3604 | ERR("UST app tp list get failed for app %d with ret %d", |
3605 | app->sock, ret); | |
3606 | } else { | |
3607 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3608 | /* |
3609 | * This is normal behavior, an application can die during the | |
3610 | * creation process. Don't report an error so the execution can | |
3611 | * continue normally. Continue normal execution. | |
3612 | */ | |
3613 | break; | |
ffe60014 | 3614 | } |
98f595d4 | 3615 | free(tmp_event); |
fb45065e | 3616 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3617 | if (release_ret < 0 && |
3618 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3619 | release_ret != -EPIPE) { | |
fb45065e MD |
3620 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3621 | } | |
3622 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3623 | goto rcu_error; |
3624 | } | |
3625 | ||
840cb59c | 3626 | health_code_update(); |
815564d8 | 3627 | if (count >= nbmem) { |
d7b3776f | 3628 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3629 | struct lttng_event *new_tmp_event; |
3630 | size_t new_nbmem; | |
3631 | ||
3632 | new_nbmem = nbmem << 1; | |
3633 | DBG2("Reallocating event list from %zu to %zu entries", | |
3634 | nbmem, new_nbmem); | |
3635 | new_tmp_event = realloc(tmp_event, | |
3636 | new_nbmem * sizeof(struct lttng_event)); | |
3637 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3638 | int release_ret; |
3639 | ||
5b4a0ec0 | 3640 | PERROR("realloc ust app events"); |
c617c0c6 | 3641 | free(tmp_event); |
5b4a0ec0 | 3642 | ret = -ENOMEM; |
fb45065e | 3643 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3644 | if (release_ret < 0 && |
3645 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3646 | release_ret != -EPIPE) { | |
fb45065e MD |
3647 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3648 | } | |
3649 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3650 | goto rcu_error; |
3651 | } | |
53efb85a MD |
3652 | /* Zero the new memory */ |
3653 | memset(new_tmp_event + nbmem, 0, | |
3654 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3655 | nbmem = new_nbmem; | |
3656 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3657 | } |
c617c0c6 MD |
3658 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3659 | tmp_event[count].loglevel = uiter.loglevel; | |
3660 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3661 | tmp_event[count].pid = app->pid; | |
3662 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3663 | count++; |
421cb601 | 3664 | } |
fb45065e MD |
3665 | ret = ustctl_release_handle(app->sock, handle); |
3666 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3667 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3668 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3669 | } | |
421cb601 DG |
3670 | } |
3671 | ||
5b4a0ec0 | 3672 | ret = count; |
c617c0c6 | 3673 | *events = tmp_event; |
421cb601 | 3674 | |
5b4a0ec0 | 3675 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3676 | |
5b4a0ec0 DG |
3677 | rcu_error: |
3678 | rcu_read_unlock(); | |
421cb601 | 3679 | error: |
840cb59c | 3680 | health_code_update(); |
5b4a0ec0 | 3681 | return ret; |
421cb601 DG |
3682 | } |
3683 | ||
f37d259d MD |
3684 | /* |
3685 | * Fill events array with all events name of all registered apps. | |
3686 | */ | |
3687 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3688 | { | |
3689 | int ret, handle; | |
3690 | size_t nbmem, count = 0; | |
3691 | struct lttng_ht_iter iter; | |
3692 | struct ust_app *app; | |
c617c0c6 | 3693 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3694 | |
3695 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3696 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3697 | if (tmp_event == NULL) { | |
f37d259d MD |
3698 | PERROR("zmalloc ust app event fields"); |
3699 | ret = -ENOMEM; | |
3700 | goto error; | |
3701 | } | |
3702 | ||
3703 | rcu_read_lock(); | |
3704 | ||
3705 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3706 | struct lttng_ust_field_iter uiter; | |
3707 | ||
840cb59c | 3708 | health_code_update(); |
86acf0da | 3709 | |
f37d259d MD |
3710 | if (!app->compatible) { |
3711 | /* | |
3712 | * TODO: In time, we should notice the caller of this error by | |
3713 | * telling him that this is a version error. | |
3714 | */ | |
3715 | continue; | |
3716 | } | |
fb45065e | 3717 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3718 | handle = ustctl_tracepoint_field_list(app->sock); |
3719 | if (handle < 0) { | |
ffe60014 DG |
3720 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3721 | ERR("UST app list field getting handle failed for app pid %d", | |
3722 | app->pid); | |
3723 | } | |
fb45065e | 3724 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3725 | continue; |
3726 | } | |
3727 | ||
3728 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3729 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3730 | /* Handle ustctl error. */ |
3731 | if (ret < 0) { | |
fb45065e MD |
3732 | int release_ret; |
3733 | ||
a2ba1ab0 | 3734 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3735 | ERR("UST app tp list field failed for app %d with ret %d", |
3736 | app->sock, ret); | |
3737 | } else { | |
3738 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3739 | /* |
3740 | * This is normal behavior, an application can die during the | |
3741 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3742 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3743 | */ |
3744 | break; | |
ffe60014 | 3745 | } |
98f595d4 | 3746 | free(tmp_event); |
fb45065e MD |
3747 | release_ret = ustctl_release_handle(app->sock, handle); |
3748 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3749 | if (release_ret < 0 && |
3750 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3751 | release_ret != -EPIPE) { | |
fb45065e MD |
3752 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3753 | } | |
ffe60014 DG |
3754 | goto rcu_error; |
3755 | } | |
3756 | ||
840cb59c | 3757 | health_code_update(); |
f37d259d | 3758 | if (count >= nbmem) { |
d7b3776f | 3759 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3760 | struct lttng_event_field *new_tmp_event; |
3761 | size_t new_nbmem; | |
3762 | ||
3763 | new_nbmem = nbmem << 1; | |
3764 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3765 | nbmem, new_nbmem); | |
3766 | new_tmp_event = realloc(tmp_event, | |
3767 | new_nbmem * sizeof(struct lttng_event_field)); | |
3768 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3769 | int release_ret; |
3770 | ||
f37d259d | 3771 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3772 | free(tmp_event); |
f37d259d | 3773 | ret = -ENOMEM; |
fb45065e MD |
3774 | release_ret = ustctl_release_handle(app->sock, handle); |
3775 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3776 | if (release_ret && |
3777 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3778 | release_ret != -EPIPE) { | |
fb45065e MD |
3779 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3780 | } | |
f37d259d MD |
3781 | goto rcu_error; |
3782 | } | |
53efb85a MD |
3783 | /* Zero the new memory */ |
3784 | memset(new_tmp_event + nbmem, 0, | |
3785 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3786 | nbmem = new_nbmem; | |
3787 | tmp_event = new_tmp_event; | |
f37d259d | 3788 | } |
f37d259d | 3789 | |
c617c0c6 | 3790 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3791 | /* Mapping between these enums matches 1 to 1. */ |
3792 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3793 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3794 | |
c617c0c6 MD |
3795 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3796 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3797 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3798 | tmp_event[count].event.pid = app->pid; |
3799 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3800 | count++; |
3801 | } | |
fb45065e MD |
3802 | ret = ustctl_release_handle(app->sock, handle); |
3803 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3804 | if (ret < 0 && |
3805 | ret != -LTTNG_UST_ERR_EXITING && | |
3806 | ret != -EPIPE) { | |
fb45065e MD |
3807 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3808 | } | |
f37d259d MD |
3809 | } |
3810 | ||
3811 | ret = count; | |
c617c0c6 | 3812 | *fields = tmp_event; |
f37d259d MD |
3813 | |
3814 | DBG2("UST app list event fields done (%zu events)", count); | |
3815 | ||
3816 | rcu_error: | |
3817 | rcu_read_unlock(); | |
3818 | error: | |
840cb59c | 3819 | health_code_update(); |
f37d259d MD |
3820 | return ret; |
3821 | } | |
3822 | ||
5b4a0ec0 DG |
3823 | /* |
3824 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3825 | * |
3826 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3827 | */ |
3828 | void ust_app_clean_list(void) | |
421cb601 | 3829 | { |
5b4a0ec0 | 3830 | int ret; |
659ed79f | 3831 | struct ust_app *app; |
bec39940 | 3832 | struct lttng_ht_iter iter; |
421cb601 | 3833 | |
5b4a0ec0 | 3834 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3835 | |
5b4a0ec0 | 3836 | rcu_read_lock(); |
421cb601 | 3837 | |
faadaa3a JG |
3838 | /* Cleanup notify socket hash table */ |
3839 | if (ust_app_ht_by_notify_sock) { | |
3840 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3841 | notify_sock_n.node) { | |
3842 | struct cds_lfht_node *node; | |
3843 | struct ust_app *app; | |
3844 | ||
3845 | node = cds_lfht_iter_get_node(&iter.iter); | |
3846 | if (!node) { | |
3847 | continue; | |
3848 | } | |
3849 | ||
3850 | app = container_of(node, struct ust_app, | |
3851 | notify_sock_n.node); | |
3852 | ust_app_notify_sock_unregister(app->notify_sock); | |
3853 | } | |
3854 | } | |
3855 | ||
f1b711c4 MD |
3856 | if (ust_app_ht) { |
3857 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3858 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3859 | assert(!ret); | |
3860 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3861 | } | |
421cb601 DG |
3862 | } |
3863 | ||
852d0037 | 3864 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3865 | if (ust_app_ht_by_sock) { |
3866 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3867 | sock_n.node) { | |
3868 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3869 | assert(!ret); | |
3870 | } | |
bec39940 | 3871 | } |
852d0037 | 3872 | |
36b588ed | 3873 | rcu_read_unlock(); |
d88aee68 | 3874 | |
bec39940 | 3875 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3876 | if (ust_app_ht) { |
3877 | ht_cleanup_push(ust_app_ht); | |
3878 | } | |
3879 | if (ust_app_ht_by_sock) { | |
3880 | ht_cleanup_push(ust_app_ht_by_sock); | |
3881 | } | |
3882 | if (ust_app_ht_by_notify_sock) { | |
3883 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3884 | } | |
5b4a0ec0 DG |
3885 | } |
3886 | ||
3887 | /* | |
3888 | * Init UST app hash table. | |
3889 | */ | |
57703f6e | 3890 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3891 | { |
bec39940 | 3892 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3893 | if (!ust_app_ht) { |
3894 | return -1; | |
3895 | } | |
852d0037 | 3896 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3897 | if (!ust_app_ht_by_sock) { |
3898 | return -1; | |
3899 | } | |
d0b96690 | 3900 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3901 | if (!ust_app_ht_by_notify_sock) { |
3902 | return -1; | |
3903 | } | |
3904 | return 0; | |
421cb601 DG |
3905 | } |
3906 | ||
78f0bacd DG |
3907 | /* |
3908 | * For a specific UST session, disable the channel for all registered apps. | |
3909 | */ | |
35a9059d | 3910 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3911 | struct ltt_ust_channel *uchan) |
3912 | { | |
3913 | int ret = 0; | |
bec39940 DG |
3914 | struct lttng_ht_iter iter; |
3915 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3916 | struct ust_app *app; |
3917 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3918 | struct ust_app_channel *ua_chan; |
78f0bacd | 3919 | |
88e3c2f5 | 3920 | assert(usess->active); |
d9bf3ca4 | 3921 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3922 | uchan->name, usess->id); |
78f0bacd DG |
3923 | |
3924 | rcu_read_lock(); | |
3925 | ||
3926 | /* For every registered applications */ | |
852d0037 | 3927 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3928 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3929 | if (!app->compatible) { |
3930 | /* | |
3931 | * TODO: In time, we should notice the caller of this error by | |
3932 | * telling him that this is a version error. | |
3933 | */ | |
3934 | continue; | |
3935 | } | |
78f0bacd DG |
3936 | ua_sess = lookup_session_by_app(usess, app); |
3937 | if (ua_sess == NULL) { | |
3938 | continue; | |
3939 | } | |
3940 | ||
8535a6d9 | 3941 | /* Get channel */ |
bec39940 DG |
3942 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3943 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3944 | /* If the session if found for the app, the channel must be there */ |
3945 | assert(ua_chan_node); | |
3946 | ||
3947 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3948 | /* The channel must not be already disabled */ | |
3949 | assert(ua_chan->enabled == 1); | |
3950 | ||
3951 | /* Disable channel onto application */ | |
3952 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3953 | if (ret < 0) { |
3954 | /* XXX: We might want to report this error at some point... */ | |
3955 | continue; | |
3956 | } | |
3957 | } | |
3958 | ||
3959 | rcu_read_unlock(); | |
78f0bacd DG |
3960 | return ret; |
3961 | } | |
3962 | ||
3963 | /* | |
3964 | * For a specific UST session, enable the channel for all registered apps. | |
3965 | */ | |
35a9059d | 3966 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3967 | struct ltt_ust_channel *uchan) |
3968 | { | |
3969 | int ret = 0; | |
bec39940 | 3970 | struct lttng_ht_iter iter; |
78f0bacd DG |
3971 | struct ust_app *app; |
3972 | struct ust_app_session *ua_sess; | |
3973 | ||
88e3c2f5 | 3974 | assert(usess->active); |
d9bf3ca4 | 3975 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3976 | uchan->name, usess->id); |
78f0bacd DG |
3977 | |
3978 | rcu_read_lock(); | |
3979 | ||
3980 | /* For every registered applications */ | |
852d0037 | 3981 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3982 | if (!app->compatible) { |
3983 | /* | |
3984 | * TODO: In time, we should notice the caller of this error by | |
3985 | * telling him that this is a version error. | |
3986 | */ | |
3987 | continue; | |
3988 | } | |
78f0bacd DG |
3989 | ua_sess = lookup_session_by_app(usess, app); |
3990 | if (ua_sess == NULL) { | |
3991 | continue; | |
3992 | } | |
3993 | ||
3994 | /* Enable channel onto application */ | |
3995 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3996 | if (ret < 0) { | |
3997 | /* XXX: We might want to report this error at some point... */ | |
3998 | continue; | |
3999 | } | |
4000 | } | |
4001 | ||
4002 | rcu_read_unlock(); | |
78f0bacd DG |
4003 | return ret; |
4004 | } | |
4005 | ||
b0a40d28 DG |
4006 | /* |
4007 | * Disable an event in a channel and for a specific session. | |
4008 | */ | |
35a9059d DG |
4009 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
4010 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
4011 | { |
4012 | int ret = 0; | |
bec39940 | 4013 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 4014 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
4015 | struct ust_app *app; |
4016 | struct ust_app_session *ua_sess; | |
4017 | struct ust_app_channel *ua_chan; | |
4018 | struct ust_app_event *ua_event; | |
4019 | ||
88e3c2f5 | 4020 | assert(usess->active); |
b0a40d28 | 4021 | DBG("UST app disabling event %s for all apps in channel " |
d9bf3ca4 MD |
4022 | "%s for session id %" PRIu64, |
4023 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
4024 | |
4025 | rcu_read_lock(); | |
4026 | ||
4027 | /* For all registered applications */ | |
852d0037 | 4028 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4029 | if (!app->compatible) { |
4030 | /* | |
4031 | * TODO: In time, we should notice the caller of this error by | |
4032 | * telling him that this is a version error. | |
4033 | */ | |
4034 | continue; | |
4035 | } | |
b0a40d28 DG |
4036 | ua_sess = lookup_session_by_app(usess, app); |
4037 | if (ua_sess == NULL) { | |
4038 | /* Next app */ | |
4039 | continue; | |
4040 | } | |
4041 | ||
4042 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4043 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4044 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4045 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4046 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4047 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4048 | continue; |
4049 | } | |
4050 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4051 | ||
700c5a9d JR |
4052 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4053 | uevent->filter, uevent->attr.loglevel, | |
4054 | uevent->exclusion); | |
4055 | if (ua_event == NULL) { | |
b0a40d28 | 4056 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4057 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4058 | continue; |
4059 | } | |
b0a40d28 | 4060 | |
7f79d3a1 | 4061 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4062 | if (ret < 0) { |
4063 | /* XXX: Report error someday... */ | |
4064 | continue; | |
4065 | } | |
4066 | } | |
4067 | ||
4068 | rcu_read_unlock(); | |
88e3c2f5 JG |
4069 | return ret; |
4070 | } | |
4071 | ||
4072 | /* The ua_sess lock must be held by the caller. */ | |
4073 | static | |
4074 | int ust_app_channel_create(struct ltt_ust_session *usess, | |
4075 | struct ust_app_session *ua_sess, | |
4076 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
4077 | struct ust_app_channel **_ua_chan) | |
4078 | { | |
4079 | int ret = 0; | |
4080 | struct ust_app_channel *ua_chan = NULL; | |
4081 | ||
4082 | assert(ua_sess); | |
4083 | ASSERT_LOCKED(ua_sess->lock); | |
4084 | ||
4085 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, | |
4086 | sizeof(uchan->name))) { | |
4087 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, | |
4088 | &uchan->attr); | |
4089 | ret = 0; | |
4090 | } else { | |
4091 | struct ltt_ust_context *uctx = NULL; | |
4092 | ||
4093 | /* | |
4094 | * Create channel onto application and synchronize its | |
4095 | * configuration. | |
4096 | */ | |
4097 | ret = ust_app_channel_allocate(ua_sess, uchan, | |
4098 | LTTNG_UST_CHAN_PER_CPU, usess, | |
4099 | &ua_chan); | |
4100 | if (ret == 0) { | |
4101 | ret = ust_app_channel_send(app, usess, | |
4102 | ua_sess, ua_chan); | |
4103 | } else { | |
4104 | goto end; | |
4105 | } | |
4106 | ||
4107 | /* Add contexts. */ | |
4108 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { | |
4109 | ret = create_ust_app_channel_context(ua_chan, | |
4110 | &uctx->ctx, app); | |
4111 | if (ret) { | |
4112 | goto end; | |
4113 | } | |
4114 | } | |
4115 | } | |
4116 | if (ret < 0) { | |
4117 | switch (ret) { | |
4118 | case -ENOTCONN: | |
4119 | /* | |
4120 | * The application's socket is not valid. Either a bad socket | |
4121 | * or a timeout on it. We can't inform the caller that for a | |
4122 | * specific app, the session failed so lets continue here. | |
4123 | */ | |
4124 | ret = 0; /* Not an error. */ | |
4125 | break; | |
4126 | case -ENOMEM: | |
4127 | default: | |
4128 | break; | |
4129 | } | |
4130 | } | |
0498a00c | 4131 | end: |
88e3c2f5 JG |
4132 | if (ret == 0 && _ua_chan) { |
4133 | /* | |
4134 | * Only return the application's channel on success. Note | |
4135 | * that the channel can still be part of the application's | |
4136 | * channel hashtable on error. | |
4137 | */ | |
4138 | *_ua_chan = ua_chan; | |
4139 | } | |
b0a40d28 DG |
4140 | return ret; |
4141 | } | |
4142 | ||
421cb601 | 4143 | /* |
5b4a0ec0 | 4144 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4145 | */ |
35a9059d | 4146 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4147 | struct ltt_ust_channel *uchan) |
4148 | { | |
88e3c2f5 JG |
4149 | int ret = 0; |
4150 | struct cds_lfht_iter iter; | |
48842b30 | 4151 | struct ust_app *app; |
48842b30 | 4152 | |
fc34caaa | 4153 | assert(usess); |
88e3c2f5 | 4154 | assert(usess->active); |
fc34caaa | 4155 | assert(uchan); |
421cb601 | 4156 | |
d9bf3ca4 | 4157 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4158 | uchan->name, usess->id); |
48842b30 DG |
4159 | |
4160 | rcu_read_lock(); | |
5b4a0ec0 | 4161 | /* For every registered applications */ |
88e3c2f5 JG |
4162 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter, app, pid_n.node) { |
4163 | struct ust_app_session *ua_sess; | |
4164 | int session_was_created = 0; | |
4165 | ||
4166 | if (!app->compatible || | |
4167 | !trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
4168 | goto error_rcu_unlock; | |
a9ad0c8f MD |
4169 | } |
4170 | ||
edb67388 DG |
4171 | /* |
4172 | * Create session on the tracer side and add it to app session HT. Note | |
4173 | * that if session exist, it will simply return a pointer to the ust | |
4174 | * app session. | |
4175 | */ | |
88e3c2f5 JG |
4176 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, |
4177 | &session_was_created); | |
3d8ca23b DG |
4178 | if (ret < 0) { |
4179 | switch (ret) { | |
4180 | case -ENOTCONN: | |
4181 | /* | |
88e3c2f5 JG |
4182 | * The application's socket is not valid. Either a bad |
4183 | * socket or a timeout on it. We can't inform the caller | |
4184 | * that for a specific app, the session failed so lets | |
4185 | * continue here; it is not an error. | |
3d8ca23b | 4186 | */ |
88e3c2f5 JG |
4187 | ret = 0; |
4188 | goto error_rcu_unlock; | |
3d8ca23b DG |
4189 | case -ENOMEM: |
4190 | default: | |
4191 | goto error_rcu_unlock; | |
4192 | } | |
48842b30 | 4193 | } |
b161602a MD |
4194 | |
4195 | if (ua_sess->deleted) { | |
b161602a MD |
4196 | continue; |
4197 | } | |
88e3c2f5 JG |
4198 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, NULL); |
4199 | if (ret) { | |
4200 | if (session_was_created) { | |
d0b96690 | 4201 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4202 | } |
88e3c2f5 | 4203 | goto error_rcu_unlock; |
48842b30 | 4204 | } |
48842b30 | 4205 | } |
5b4a0ec0 | 4206 | |
95e047ff | 4207 | error_rcu_unlock: |
48842b30 | 4208 | rcu_read_unlock(); |
3c14c33f | 4209 | return ret; |
48842b30 DG |
4210 | } |
4211 | ||
5b4a0ec0 | 4212 | /* |
edb67388 | 4213 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4214 | */ |
35a9059d | 4215 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4216 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4217 | { | |
4218 | int ret = 0; | |
bec39940 | 4219 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4220 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4221 | struct ust_app *app; |
4222 | struct ust_app_session *ua_sess; | |
4223 | struct ust_app_channel *ua_chan; | |
4224 | struct ust_app_event *ua_event; | |
48842b30 | 4225 | |
88e3c2f5 | 4226 | assert(usess->active); |
d9bf3ca4 | 4227 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4228 | uevent->attr.name, usess->id); |
48842b30 | 4229 | |
edb67388 DG |
4230 | /* |
4231 | * NOTE: At this point, this function is called only if the session and | |
4232 | * channel passed are already created for all apps. and enabled on the | |
4233 | * tracer also. | |
4234 | */ | |
4235 | ||
48842b30 | 4236 | rcu_read_lock(); |
421cb601 DG |
4237 | |
4238 | /* For all registered applications */ | |
852d0037 | 4239 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4240 | if (!app->compatible) { |
4241 | /* | |
4242 | * TODO: In time, we should notice the caller of this error by | |
4243 | * telling him that this is a version error. | |
4244 | */ | |
4245 | continue; | |
4246 | } | |
edb67388 | 4247 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4248 | if (!ua_sess) { |
4249 | /* The application has problem or is probably dead. */ | |
4250 | continue; | |
4251 | } | |
ba767faf | 4252 | |
d0b96690 DG |
4253 | pthread_mutex_lock(&ua_sess->lock); |
4254 | ||
b161602a MD |
4255 | if (ua_sess->deleted) { |
4256 | pthread_mutex_unlock(&ua_sess->lock); | |
4257 | continue; | |
4258 | } | |
4259 | ||
edb67388 | 4260 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4261 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4262 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4263 | /* |
4264 | * It is possible that the channel cannot be found is | |
4265 | * the channel/event creation occurs concurrently with | |
4266 | * an application exit. | |
4267 | */ | |
4268 | if (!ua_chan_node) { | |
4269 | pthread_mutex_unlock(&ua_sess->lock); | |
4270 | continue; | |
4271 | } | |
edb67388 DG |
4272 | |
4273 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4274 | ||
18eace3b DG |
4275 | /* Get event node */ |
4276 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4277 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4278 | if (ua_event == NULL) { |
7f79d3a1 | 4279 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4280 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4281 | goto next_app; |
35a9059d | 4282 | } |
35a9059d DG |
4283 | |
4284 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4285 | if (ret < 0) { | |
d0b96690 | 4286 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4287 | goto error; |
48842b30 | 4288 | } |
d0b96690 DG |
4289 | next_app: |
4290 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4291 | } |
4292 | ||
7f79d3a1 | 4293 | error: |
edb67388 | 4294 | rcu_read_unlock(); |
edb67388 DG |
4295 | return ret; |
4296 | } | |
4297 | ||
4298 | /* | |
4299 | * For a specific existing UST session and UST channel, creates the event for | |
4300 | * all registered apps. | |
4301 | */ | |
35a9059d | 4302 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4303 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4304 | { | |
4305 | int ret = 0; | |
bec39940 DG |
4306 | struct lttng_ht_iter iter, uiter; |
4307 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4308 | struct ust_app *app; |
4309 | struct ust_app_session *ua_sess; | |
4310 | struct ust_app_channel *ua_chan; | |
4311 | ||
88e3c2f5 | 4312 | assert(usess->active); |
d9bf3ca4 | 4313 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4314 | uevent->attr.name, usess->id); |
edb67388 | 4315 | |
edb67388 DG |
4316 | rcu_read_lock(); |
4317 | ||
4318 | /* For all registered applications */ | |
852d0037 | 4319 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4320 | if (!app->compatible) { |
4321 | /* | |
4322 | * TODO: In time, we should notice the caller of this error by | |
4323 | * telling him that this is a version error. | |
4324 | */ | |
4325 | continue; | |
4326 | } | |
edb67388 | 4327 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4328 | if (!ua_sess) { |
4329 | /* The application has problem or is probably dead. */ | |
4330 | continue; | |
4331 | } | |
48842b30 | 4332 | |
d0b96690 | 4333 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4334 | |
4335 | if (ua_sess->deleted) { | |
4336 | pthread_mutex_unlock(&ua_sess->lock); | |
4337 | continue; | |
4338 | } | |
4339 | ||
48842b30 | 4340 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4341 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4342 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4343 | /* If the channel is not found, there is a code flow error */ |
4344 | assert(ua_chan_node); | |
4345 | ||
48842b30 DG |
4346 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4347 | ||
edb67388 | 4348 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4349 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4350 | if (ret < 0) { |
49c336c1 | 4351 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4352 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4353 | break; | |
4354 | } | |
4355 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4356 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4357 | continue; |
48842b30 | 4358 | } |
48842b30 | 4359 | } |
5b4a0ec0 | 4360 | |
48842b30 | 4361 | rcu_read_unlock(); |
48842b30 DG |
4362 | return ret; |
4363 | } | |
4364 | ||
5b4a0ec0 DG |
4365 | /* |
4366 | * Start tracing for a specific UST session and app. | |
fad1ed2f JR |
4367 | * |
4368 | * Called with UST app session lock held. | |
4369 | * | |
5b4a0ec0 | 4370 | */ |
b34cbebf | 4371 | static |
421cb601 | 4372 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4373 | { |
4374 | int ret = 0; | |
48842b30 | 4375 | struct ust_app_session *ua_sess; |
48842b30 | 4376 | |
852d0037 | 4377 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4378 | |
509cbaf8 MD |
4379 | rcu_read_lock(); |
4380 | ||
e0c7ec2b DG |
4381 | if (!app->compatible) { |
4382 | goto end; | |
4383 | } | |
4384 | ||
421cb601 DG |
4385 | ua_sess = lookup_session_by_app(usess, app); |
4386 | if (ua_sess == NULL) { | |
d42f20df DG |
4387 | /* The session is in teardown process. Ignore and continue. */ |
4388 | goto end; | |
421cb601 | 4389 | } |
48842b30 | 4390 | |
d0b96690 DG |
4391 | pthread_mutex_lock(&ua_sess->lock); |
4392 | ||
b161602a MD |
4393 | if (ua_sess->deleted) { |
4394 | pthread_mutex_unlock(&ua_sess->lock); | |
4395 | goto end; | |
4396 | } | |
4397 | ||
aea829b3 DG |
4398 | /* Upon restart, we skip the setup, already done */ |
4399 | if (ua_sess->started) { | |
8be98f9a | 4400 | goto skip_setup; |
aea829b3 | 4401 | } |
8be98f9a | 4402 | |
d65d2de8 DG |
4403 | /* |
4404 | * Create the metadata for the application. This returns gracefully if a | |
4405 | * metadata was already set for the session. | |
4406 | */ | |
ad7a9107 | 4407 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4408 | if (ret < 0) { |
d0b96690 | 4409 | goto error_unlock; |
421cb601 | 4410 | } |
48842b30 | 4411 | |
840cb59c | 4412 | health_code_update(); |
86acf0da | 4413 | |
8be98f9a | 4414 | skip_setup: |
421cb601 | 4415 | /* This start the UST tracing */ |
fb45065e | 4416 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4417 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4418 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4419 | if (ret < 0) { |
ffe60014 DG |
4420 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4421 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4422 | app->pid, ret); | |
4423 | } else { | |
4424 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4425 | /* |
4426 | * This is normal behavior, an application can die during the | |
4427 | * creation process. Don't report an error so the execution can | |
4428 | * continue normally. | |
4429 | */ | |
4430 | pthread_mutex_unlock(&ua_sess->lock); | |
4431 | goto end; | |
ffe60014 | 4432 | } |
d0b96690 | 4433 | goto error_unlock; |
421cb601 | 4434 | } |
5b4a0ec0 | 4435 | |
55c3953d DG |
4436 | /* Indicate that the session has been started once */ |
4437 | ua_sess->started = 1; | |
4438 | ||
d0b96690 DG |
4439 | pthread_mutex_unlock(&ua_sess->lock); |
4440 | ||
840cb59c | 4441 | health_code_update(); |
86acf0da | 4442 | |
421cb601 | 4443 | /* Quiescent wait after starting trace */ |
fb45065e | 4444 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4445 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4446 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4447 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4448 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4449 | app->pid, ret); | |
4450 | } | |
48842b30 | 4451 | |
e0c7ec2b DG |
4452 | end: |
4453 | rcu_read_unlock(); | |
840cb59c | 4454 | health_code_update(); |
421cb601 | 4455 | return 0; |
48842b30 | 4456 | |
d0b96690 DG |
4457 | error_unlock: |
4458 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4459 | rcu_read_unlock(); |
840cb59c | 4460 | health_code_update(); |
421cb601 DG |
4461 | return -1; |
4462 | } | |
48842b30 | 4463 | |
8be98f9a MD |
4464 | /* |
4465 | * Stop tracing for a specific UST session and app. | |
4466 | */ | |
b34cbebf | 4467 | static |
8be98f9a MD |
4468 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4469 | { | |
4470 | int ret = 0; | |
4471 | struct ust_app_session *ua_sess; | |
7972aab2 | 4472 | struct ust_registry_session *registry; |
8be98f9a | 4473 | |
852d0037 | 4474 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4475 | |
4476 | rcu_read_lock(); | |
4477 | ||
e0c7ec2b | 4478 | if (!app->compatible) { |
d88aee68 | 4479 | goto end_no_session; |
e0c7ec2b DG |
4480 | } |
4481 | ||
8be98f9a MD |
4482 | ua_sess = lookup_session_by_app(usess, app); |
4483 | if (ua_sess == NULL) { | |
d88aee68 | 4484 | goto end_no_session; |
8be98f9a MD |
4485 | } |
4486 | ||
d88aee68 DG |
4487 | pthread_mutex_lock(&ua_sess->lock); |
4488 | ||
b161602a MD |
4489 | if (ua_sess->deleted) { |
4490 | pthread_mutex_unlock(&ua_sess->lock); | |
4491 | goto end_no_session; | |
4492 | } | |
4493 | ||
9bc07046 DG |
4494 | /* |
4495 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4496 | * that was never started. It's possible since we can have a fail start |
4497 | * from either the application manager thread or the command thread. Simply | |
4498 | * indicate that this is a stop error. | |
9bc07046 | 4499 | */ |
f9dfc3d9 | 4500 | if (!ua_sess->started) { |
c45536e1 DG |
4501 | goto error_rcu_unlock; |
4502 | } | |
7db205b5 | 4503 | |
840cb59c | 4504 | health_code_update(); |
86acf0da | 4505 | |
9d6c7d3f | 4506 | /* This inhibits UST tracing */ |
fb45065e | 4507 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4508 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4509 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4510 | if (ret < 0) { |
ffe60014 DG |
4511 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4512 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4513 | app->pid, ret); | |
4514 | } else { | |
4515 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4516 | /* |
4517 | * This is normal behavior, an application can die during the | |
4518 | * creation process. Don't report an error so the execution can | |
4519 | * continue normally. | |
4520 | */ | |
4521 | goto end_unlock; | |
ffe60014 | 4522 | } |
9d6c7d3f DG |
4523 | goto error_rcu_unlock; |
4524 | } | |
4525 | ||
840cb59c | 4526 | health_code_update(); |
86acf0da | 4527 | |
9d6c7d3f | 4528 | /* Quiescent wait after stopping trace */ |
fb45065e | 4529 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4530 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4531 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4532 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4533 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4534 | app->pid, ret); | |
4535 | } | |
9d6c7d3f | 4536 | |
840cb59c | 4537 | health_code_update(); |
86acf0da | 4538 | |
b34cbebf | 4539 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
4540 | |
4541 | /* The UST app session is held registry shall not be null. */ | |
b34cbebf | 4542 | assert(registry); |
1b532a60 | 4543 | |
ce34fcd0 MD |
4544 | /* Push metadata for application before freeing the application. */ |
4545 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4546 | |
3757b385 | 4547 | end_unlock: |
b34cbebf MD |
4548 | pthread_mutex_unlock(&ua_sess->lock); |
4549 | end_no_session: | |
4550 | rcu_read_unlock(); | |
4551 | health_code_update(); | |
4552 | return 0; | |
4553 | ||
4554 | error_rcu_unlock: | |
4555 | pthread_mutex_unlock(&ua_sess->lock); | |
4556 | rcu_read_unlock(); | |
4557 | health_code_update(); | |
4558 | return -1; | |
4559 | } | |
4560 | ||
b34cbebf | 4561 | static |
c4b88406 MD |
4562 | int ust_app_flush_app_session(struct ust_app *app, |
4563 | struct ust_app_session *ua_sess) | |
b34cbebf | 4564 | { |
c4b88406 | 4565 | int ret, retval = 0; |
b34cbebf | 4566 | struct lttng_ht_iter iter; |
b34cbebf | 4567 | struct ust_app_channel *ua_chan; |
c4b88406 | 4568 | struct consumer_socket *socket; |
b34cbebf | 4569 | |
c4b88406 | 4570 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4571 | |
4572 | rcu_read_lock(); | |
4573 | ||
4574 | if (!app->compatible) { | |
c4b88406 | 4575 | goto end_not_compatible; |
b34cbebf MD |
4576 | } |
4577 | ||
4578 | pthread_mutex_lock(&ua_sess->lock); | |
4579 | ||
b161602a MD |
4580 | if (ua_sess->deleted) { |
4581 | goto end_deleted; | |
4582 | } | |
4583 | ||
b34cbebf MD |
4584 | health_code_update(); |
4585 | ||
9d6c7d3f | 4586 | /* Flushing buffers */ |
c4b88406 MD |
4587 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4588 | ua_sess->consumer); | |
ce34fcd0 MD |
4589 | |
4590 | /* Flush buffers and push metadata. */ | |
4591 | switch (ua_sess->buffer_type) { | |
4592 | case LTTNG_BUFFER_PER_PID: | |
4593 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4594 | node.node) { | |
4595 | health_code_update(); | |
ce34fcd0 MD |
4596 | ret = consumer_flush_channel(socket, ua_chan->key); |
4597 | if (ret) { | |
4598 | ERR("Error flushing consumer channel"); | |
4599 | retval = -1; | |
4600 | continue; | |
4601 | } | |
8be98f9a | 4602 | } |
ce34fcd0 MD |
4603 | break; |
4604 | case LTTNG_BUFFER_PER_UID: | |
4605 | default: | |
4606 | assert(0); | |
4607 | break; | |
8be98f9a | 4608 | } |
8be98f9a | 4609 | |
840cb59c | 4610 | health_code_update(); |
86acf0da | 4611 | |
b161602a | 4612 | end_deleted: |
d88aee68 | 4613 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4614 | |
c4b88406 MD |
4615 | end_not_compatible: |
4616 | rcu_read_unlock(); | |
4617 | health_code_update(); | |
4618 | return retval; | |
4619 | } | |
4620 | ||
4621 | /* | |
ce34fcd0 MD |
4622 | * Flush buffers for all applications for a specific UST session. |
4623 | * Called with UST session lock held. | |
c4b88406 MD |
4624 | */ |
4625 | static | |
ce34fcd0 | 4626 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4627 | |
4628 | { | |
99b1411c | 4629 | int ret = 0; |
c4b88406 | 4630 | |
ce34fcd0 | 4631 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4632 | |
4633 | rcu_read_lock(); | |
4634 | ||
ce34fcd0 MD |
4635 | /* Flush buffers and push metadata. */ |
4636 | switch (usess->buffer_type) { | |
4637 | case LTTNG_BUFFER_PER_UID: | |
4638 | { | |
4639 | struct buffer_reg_uid *reg; | |
4640 | struct lttng_ht_iter iter; | |
4641 | ||
4642 | /* Flush all per UID buffers associated to that session. */ | |
4643 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4644 | struct ust_registry_session *ust_session_reg; | |
4645 | struct buffer_reg_channel *reg_chan; | |
4646 | struct consumer_socket *socket; | |
4647 | ||
4648 | /* Get consumer socket to use to push the metadata.*/ | |
4649 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4650 | usess->consumer); | |
4651 | if (!socket) { | |
4652 | /* Ignore request if no consumer is found for the session. */ | |
4653 | continue; | |
4654 | } | |
4655 | ||
4656 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4657 | reg_chan, node.node) { | |
4658 | /* | |
4659 | * The following call will print error values so the return | |
4660 | * code is of little importance because whatever happens, we | |
4661 | * have to try them all. | |
4662 | */ | |
4663 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4664 | } | |
4665 | ||
4666 | ust_session_reg = reg->registry->reg.ust; | |
4667 | /* Push metadata. */ | |
4668 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4669 | } | |
ce34fcd0 MD |
4670 | break; |
4671 | } | |
4672 | case LTTNG_BUFFER_PER_PID: | |
4673 | { | |
4674 | struct ust_app_session *ua_sess; | |
4675 | struct lttng_ht_iter iter; | |
4676 | struct ust_app *app; | |
4677 | ||
4678 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4679 | ua_sess = lookup_session_by_app(usess, app); | |
4680 | if (ua_sess == NULL) { | |
4681 | continue; | |
4682 | } | |
4683 | (void) ust_app_flush_app_session(app, ua_sess); | |
4684 | } | |
4685 | break; | |
4686 | } | |
4687 | default: | |
99b1411c | 4688 | ret = -1; |
ce34fcd0 MD |
4689 | assert(0); |
4690 | break; | |
c4b88406 | 4691 | } |
c4b88406 | 4692 | |
7db205b5 | 4693 | rcu_read_unlock(); |
840cb59c | 4694 | health_code_update(); |
c4b88406 | 4695 | return ret; |
8be98f9a MD |
4696 | } |
4697 | ||
0dd01979 MD |
4698 | static |
4699 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4700 | struct ust_app_session *ua_sess) | |
4701 | { | |
4702 | int ret = 0; | |
4703 | struct lttng_ht_iter iter; | |
4704 | struct ust_app_channel *ua_chan; | |
4705 | struct consumer_socket *socket; | |
4706 | ||
4707 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4708 | ||
4709 | rcu_read_lock(); | |
4710 | ||
4711 | if (!app->compatible) { | |
4712 | goto end_not_compatible; | |
4713 | } | |
4714 | ||
4715 | pthread_mutex_lock(&ua_sess->lock); | |
4716 | ||
4717 | if (ua_sess->deleted) { | |
4718 | goto end_unlock; | |
4719 | } | |
4720 | ||
4721 | health_code_update(); | |
4722 | ||
4723 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4724 | ua_sess->consumer); | |
4725 | if (!socket) { | |
4726 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4727 | app->bits_per_long); | |
4728 | ret = -1; | |
4729 | goto end_unlock; | |
4730 | } | |
4731 | ||
4732 | /* Clear quiescent state. */ | |
4733 | switch (ua_sess->buffer_type) { | |
4734 | case LTTNG_BUFFER_PER_PID: | |
4735 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4736 | ua_chan, node.node) { | |
4737 | health_code_update(); | |
4738 | ret = consumer_clear_quiescent_channel(socket, | |
4739 | ua_chan->key); | |
4740 | if (ret) { | |
4741 | ERR("Error clearing quiescent state for consumer channel"); | |
4742 | ret = -1; | |
4743 | continue; | |
4744 | } | |
4745 | } | |
4746 | break; | |
4747 | case LTTNG_BUFFER_PER_UID: | |
4748 | default: | |
4749 | assert(0); | |
4750 | ret = -1; | |
4751 | break; | |
4752 | } | |
4753 | ||
4754 | health_code_update(); | |
4755 | ||
4756 | end_unlock: | |
4757 | pthread_mutex_unlock(&ua_sess->lock); | |
4758 | ||
4759 | end_not_compatible: | |
4760 | rcu_read_unlock(); | |
4761 | health_code_update(); | |
4762 | return ret; | |
4763 | } | |
4764 | ||
4765 | /* | |
4766 | * Clear quiescent state in each stream for all applications for a | |
4767 | * specific UST session. | |
4768 | * Called with UST session lock held. | |
4769 | */ | |
4770 | static | |
4771 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4772 | ||
4773 | { | |
4774 | int ret = 0; | |
4775 | ||
4776 | DBG("Clearing stream quiescent state for all ust apps"); | |
4777 | ||
4778 | rcu_read_lock(); | |
4779 | ||
4780 | switch (usess->buffer_type) { | |
4781 | case LTTNG_BUFFER_PER_UID: | |
4782 | { | |
4783 | struct lttng_ht_iter iter; | |
4784 | struct buffer_reg_uid *reg; | |
4785 | ||
4786 | /* | |
4787 | * Clear quiescent for all per UID buffers associated to | |
4788 | * that session. | |
4789 | */ | |
4790 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4791 | struct consumer_socket *socket; | |
4792 | struct buffer_reg_channel *reg_chan; | |
4793 | ||
4794 | /* Get associated consumer socket.*/ | |
4795 | socket = consumer_find_socket_by_bitness( | |
4796 | reg->bits_per_long, usess->consumer); | |
4797 | if (!socket) { | |
4798 | /* | |
4799 | * Ignore request if no consumer is found for | |
4800 | * the session. | |
4801 | */ | |
4802 | continue; | |
4803 | } | |
4804 | ||
4805 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4806 | &iter.iter, reg_chan, node.node) { | |
4807 | /* | |
4808 | * The following call will print error values so | |
4809 | * the return code is of little importance | |
4810 | * because whatever happens, we have to try them | |
4811 | * all. | |
4812 | */ | |
4813 | (void) consumer_clear_quiescent_channel(socket, | |
4814 | reg_chan->consumer_key); | |
4815 | } | |
4816 | } | |
4817 | break; | |
4818 | } | |
4819 | case LTTNG_BUFFER_PER_PID: | |
4820 | { | |
4821 | struct ust_app_session *ua_sess; | |
4822 | struct lttng_ht_iter iter; | |
4823 | struct ust_app *app; | |
4824 | ||
4825 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4826 | pid_n.node) { | |
4827 | ua_sess = lookup_session_by_app(usess, app); | |
4828 | if (ua_sess == NULL) { | |
4829 | continue; | |
4830 | } | |
4831 | (void) ust_app_clear_quiescent_app_session(app, | |
4832 | ua_sess); | |
4833 | } | |
4834 | break; | |
4835 | } | |
4836 | default: | |
4837 | ret = -1; | |
4838 | assert(0); | |
4839 | break; | |
4840 | } | |
4841 | ||
4842 | rcu_read_unlock(); | |
4843 | health_code_update(); | |
4844 | return ret; | |
4845 | } | |
4846 | ||
84cd17c6 MD |
4847 | /* |
4848 | * Destroy a specific UST session in apps. | |
4849 | */ | |
3353de95 | 4850 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4851 | { |
ffe60014 | 4852 | int ret; |
84cd17c6 | 4853 | struct ust_app_session *ua_sess; |
bec39940 | 4854 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4855 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4856 | |
852d0037 | 4857 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4858 | |
4859 | rcu_read_lock(); | |
4860 | ||
e0c7ec2b DG |
4861 | if (!app->compatible) { |
4862 | goto end; | |
4863 | } | |
4864 | ||
84cd17c6 | 4865 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4866 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4867 | if (node == NULL) { |
d42f20df DG |
4868 | /* Session is being or is deleted. */ |
4869 | goto end; | |
84cd17c6 MD |
4870 | } |
4871 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4872 | |
840cb59c | 4873 | health_code_update(); |
d0b96690 | 4874 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4875 | |
840cb59c | 4876 | health_code_update(); |
7db205b5 | 4877 | |
84cd17c6 | 4878 | /* Quiescent wait after stopping trace */ |
fb45065e | 4879 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4880 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4881 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4882 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4883 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4884 | app->pid, ret); | |
4885 | } | |
e0c7ec2b DG |
4886 | end: |
4887 | rcu_read_unlock(); | |
840cb59c | 4888 | health_code_update(); |
84cd17c6 | 4889 | return 0; |
84cd17c6 MD |
4890 | } |
4891 | ||
5b4a0ec0 DG |
4892 | /* |
4893 | * Start tracing for the UST session. | |
4894 | */ | |
421cb601 DG |
4895 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4896 | { | |
bec39940 | 4897 | struct lttng_ht_iter iter; |
421cb601 | 4898 | struct ust_app *app; |
48842b30 | 4899 | |
421cb601 DG |
4900 | DBG("Starting all UST traces"); |
4901 | ||
bb2452c8 MD |
4902 | /* |
4903 | * Even though the start trace might fail, flag this session active so | |
4904 | * other application coming in are started by default. | |
4905 | */ | |
4906 | usess->active = 1; | |
4907 | ||
421cb601 | 4908 | rcu_read_lock(); |
421cb601 | 4909 | |
0dd01979 MD |
4910 | /* |
4911 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4912 | * of each channel set by the prior stop command, thus ensuring that a | |
4913 | * following stop or destroy is sure to grab a timestamp_end near those | |
4914 | * operations, even if the packet is empty. | |
4915 | */ | |
4916 | (void) ust_app_clear_quiescent_session(usess); | |
4917 | ||
0498a00c MD |
4918 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4919 | ust_app_global_update(usess, app); | |
4920 | } | |
4921 | ||
48842b30 DG |
4922 | rcu_read_unlock(); |
4923 | ||
4924 | return 0; | |
4925 | } | |
487cf67c | 4926 | |
8be98f9a MD |
4927 | /* |
4928 | * Start tracing for the UST session. | |
ce34fcd0 | 4929 | * Called with UST session lock held. |
8be98f9a MD |
4930 | */ |
4931 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4932 | { | |
4933 | int ret = 0; | |
bec39940 | 4934 | struct lttng_ht_iter iter; |
8be98f9a MD |
4935 | struct ust_app *app; |
4936 | ||
4937 | DBG("Stopping all UST traces"); | |
4938 | ||
bb2452c8 MD |
4939 | /* |
4940 | * Even though the stop trace might fail, flag this session inactive so | |
4941 | * other application coming in are not started by default. | |
4942 | */ | |
4943 | usess->active = 0; | |
4944 | ||
8be98f9a MD |
4945 | rcu_read_lock(); |
4946 | ||
b34cbebf MD |
4947 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4948 | ret = ust_app_stop_trace(usess, app); | |
4949 | if (ret < 0) { | |
4950 | /* Continue to next apps even on error */ | |
4951 | continue; | |
4952 | } | |
4953 | } | |
4954 | ||
ce34fcd0 | 4955 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4956 | |
4957 | rcu_read_unlock(); | |
4958 | ||
4959 | return 0; | |
4960 | } | |
4961 | ||
84cd17c6 MD |
4962 | /* |
4963 | * Destroy app UST session. | |
4964 | */ | |
4965 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4966 | { | |
4967 | int ret = 0; | |
bec39940 | 4968 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4969 | struct ust_app *app; |
4970 | ||
4971 | DBG("Destroy all UST traces"); | |
4972 | ||
4973 | rcu_read_lock(); | |
4974 | ||
852d0037 | 4975 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4976 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4977 | if (ret < 0) { |
4978 | /* Continue to next apps even on error */ | |
4979 | continue; | |
4980 | } | |
4981 | } | |
4982 | ||
4983 | rcu_read_unlock(); | |
4984 | ||
4985 | return 0; | |
4986 | } | |
4987 | ||
88e3c2f5 | 4988 | /* The ua_sess lock must be held by the caller. */ |
a9ad0c8f | 4989 | static |
88e3c2f5 JG |
4990 | int find_or_create_ust_app_channel( |
4991 | struct ltt_ust_session *usess, | |
4992 | struct ust_app_session *ua_sess, | |
4993 | struct ust_app *app, | |
4994 | struct ltt_ust_channel *uchan, | |
4995 | struct ust_app_channel **ua_chan) | |
487cf67c | 4996 | { |
55c54cce | 4997 | int ret = 0; |
88e3c2f5 JG |
4998 | struct lttng_ht_iter iter; |
4999 | struct lttng_ht_node_str *ua_chan_node; | |
5000 | ||
5001 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &iter); | |
5002 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
5003 | if (ua_chan_node) { | |
5004 | *ua_chan = caa_container_of(ua_chan_node, | |
5005 | struct ust_app_channel, node); | |
5006 | goto end; | |
5007 | } | |
5008 | ||
5009 | ret = ust_app_channel_create(usess, ua_sess, uchan, app, ua_chan); | |
5010 | if (ret) { | |
5011 | goto end; | |
5012 | } | |
5013 | end: | |
5014 | return ret; | |
5015 | } | |
5016 | ||
5017 | static | |
5018 | int ust_app_channel_synchronize_event(struct ust_app_channel *ua_chan, | |
5019 | struct ltt_ust_event *uevent, struct ust_app_session *ua_sess, | |
5020 | struct ust_app *app) | |
5021 | { | |
5022 | int ret = 0; | |
5023 | struct ust_app_event *ua_event = NULL; | |
5024 | ||
5025 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
5026 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); | |
5027 | if (!ua_event) { | |
5028 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); | |
5029 | if (ret < 0) { | |
5030 | goto end; | |
5031 | } | |
5032 | } else { | |
5033 | if (ua_event->enabled != uevent->enabled) { | |
5034 | ret = uevent->enabled ? | |
5035 | enable_ust_app_event(ua_sess, ua_event, app) : | |
5036 | disable_ust_app_event(ua_sess, ua_event, app); | |
5037 | } | |
5038 | } | |
5039 | ||
5040 | end: | |
5041 | return ret; | |
5042 | } | |
5043 | ||
5044 | /* | |
5045 | * The caller must ensure that the application is compatible and is tracked | |
5046 | * by the PID tracker. | |
5047 | */ | |
5048 | static | |
5049 | void ust_app_synchronize(struct ltt_ust_session *usess, | |
5050 | struct ust_app *app) | |
5051 | { | |
5052 | int ret = 0; | |
5053 | struct cds_lfht_iter uchan_iter; | |
5054 | struct ltt_ust_channel *uchan; | |
3d8ca23b | 5055 | struct ust_app_session *ua_sess = NULL; |
1f3580c7 | 5056 | |
88e3c2f5 JG |
5057 | /* |
5058 | * The application's configuration should only be synchronized for | |
5059 | * active sessions. | |
5060 | */ | |
5061 | assert(usess->active); | |
5062 | ||
5063 | ret = find_or_create_ust_app_session(usess, app, &ua_sess, NULL); | |
3d8ca23b DG |
5064 | if (ret < 0) { |
5065 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
5066 | goto error; |
5067 | } | |
3d8ca23b | 5068 | assert(ua_sess); |
487cf67c | 5069 | |
d0b96690 | 5070 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5071 | if (ua_sess->deleted) { |
5072 | pthread_mutex_unlock(&ua_sess->lock); | |
5073 | goto end; | |
5074 | } | |
5075 | ||
88e3c2f5 JG |
5076 | rcu_read_lock(); |
5077 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &uchan_iter, | |
5078 | uchan, node.node) { | |
5079 | struct ust_app_channel *ua_chan; | |
5080 | struct cds_lfht_iter uevent_iter; | |
5081 | struct ltt_ust_event *uevent; | |
487cf67c | 5082 | |
31746f93 | 5083 | /* |
88e3c2f5 JG |
5084 | * Search for a matching ust_app_channel. If none is found, |
5085 | * create it. Creating the channel will cause the ua_chan | |
5086 | * structure to be allocated, the channel buffers to be | |
5087 | * allocated (if necessary) and sent to the application, and | |
5088 | * all enabled contexts will be added to the channel. | |
31746f93 | 5089 | */ |
88e3c2f5 JG |
5090 | ret = find_or_create_ust_app_channel(usess, ua_sess, |
5091 | app, uchan, &ua_chan); | |
5092 | if (ret) { | |
5093 | /* Tracer is probably gone or ENOMEM. */ | |
5094 | goto error_unlock; | |
727d5404 DG |
5095 | } |
5096 | ||
88e3c2f5 JG |
5097 | if (!ua_chan) { |
5098 | /* ua_chan will be NULL for the metadata channel */ | |
5099 | continue; | |
5100 | } | |
727d5404 | 5101 | |
88e3c2f5 | 5102 | cds_lfht_for_each_entry(uchan->events->ht, &uevent_iter, uevent, |
bec39940 | 5103 | node.node) { |
88e3c2f5 JG |
5104 | ret = ust_app_channel_synchronize_event(ua_chan, |
5105 | uevent, ua_sess, app); | |
5106 | if (ret) { | |
d0b96690 | 5107 | goto error_unlock; |
487cf67c | 5108 | } |
36dc12cc | 5109 | } |
d0b96690 | 5110 | |
88e3c2f5 JG |
5111 | if (ua_chan->enabled != uchan->enabled) { |
5112 | ret = uchan->enabled ? | |
5113 | enable_ust_app_channel(ua_sess, uchan, app) : | |
5114 | disable_ust_app_channel(ua_sess, ua_chan, app); | |
5115 | if (ret) { | |
5116 | goto error_unlock; | |
5117 | } | |
5118 | } | |
36dc12cc | 5119 | } |
88e3c2f5 | 5120 | rcu_read_unlock(); |
0498a00c | 5121 | |
a9ad0c8f | 5122 | end: |
88e3c2f5 | 5123 | pthread_mutex_unlock(&ua_sess->lock); |
ffe60014 | 5124 | /* Everything went well at this point. */ |
ffe60014 DG |
5125 | return; |
5126 | ||
d0b96690 | 5127 | error_unlock: |
88e3c2f5 | 5128 | rcu_read_unlock(); |
d0b96690 | 5129 | pthread_mutex_unlock(&ua_sess->lock); |
487cf67c | 5130 | error: |
ffe60014 | 5131 | if (ua_sess) { |
d0b96690 | 5132 | destroy_app_session(app, ua_sess); |
ffe60014 | 5133 | } |
487cf67c DG |
5134 | return; |
5135 | } | |
55cc08a6 | 5136 | |
a9ad0c8f MD |
5137 | static |
5138 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5139 | { | |
5140 | struct ust_app_session *ua_sess; | |
5141 | ||
5142 | ua_sess = lookup_session_by_app(usess, app); | |
5143 | if (ua_sess == NULL) { | |
5144 | return; | |
5145 | } | |
5146 | destroy_app_session(app, ua_sess); | |
5147 | } | |
5148 | ||
5149 | /* | |
5150 | * Add channels/events from UST global domain to registered apps at sock. | |
5151 | * | |
5152 | * Called with session lock held. | |
5153 | * Called with RCU read-side lock held. | |
5154 | */ | |
5155 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5156 | { | |
5157 | assert(usess); | |
88e3c2f5 | 5158 | assert(usess->active); |
a9ad0c8f MD |
5159 | |
5160 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5161 | app->sock, usess->id); | |
5162 | ||
5163 | if (!app->compatible) { | |
5164 | return; | |
5165 | } | |
a9ad0c8f | 5166 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { |
88e3c2f5 JG |
5167 | /* |
5168 | * Synchronize the application's internal tracing configuration | |
5169 | * and start tracing. | |
5170 | */ | |
5171 | ust_app_synchronize(usess, app); | |
5172 | ust_app_start_trace(usess, app); | |
a9ad0c8f MD |
5173 | } else { |
5174 | ust_app_global_destroy(usess, app); | |
5175 | } | |
5176 | } | |
5177 | ||
5178 | /* | |
5179 | * Called with session lock held. | |
5180 | */ | |
5181 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5182 | { | |
5183 | struct lttng_ht_iter iter; | |
5184 | struct ust_app *app; | |
5185 | ||
5186 | rcu_read_lock(); | |
5187 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5188 | ust_app_global_update(usess, app); | |
5189 | } | |
5190 | rcu_read_unlock(); | |
5191 | } | |
5192 | ||
55cc08a6 DG |
5193 | /* |
5194 | * Add context to a specific channel for global UST domain. | |
5195 | */ | |
5196 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5197 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5198 | { | |
5199 | int ret = 0; | |
bec39940 DG |
5200 | struct lttng_ht_node_str *ua_chan_node; |
5201 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5202 | struct ust_app_channel *ua_chan = NULL; |
5203 | struct ust_app_session *ua_sess; | |
5204 | struct ust_app *app; | |
5205 | ||
88e3c2f5 | 5206 | assert(usess->active); |
0498a00c | 5207 | |
55cc08a6 | 5208 | rcu_read_lock(); |
852d0037 | 5209 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5210 | if (!app->compatible) { |
5211 | /* | |
5212 | * TODO: In time, we should notice the caller of this error by | |
5213 | * telling him that this is a version error. | |
5214 | */ | |
5215 | continue; | |
5216 | } | |
55cc08a6 DG |
5217 | ua_sess = lookup_session_by_app(usess, app); |
5218 | if (ua_sess == NULL) { | |
5219 | continue; | |
5220 | } | |
5221 | ||
d0b96690 | 5222 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5223 | |
5224 | if (ua_sess->deleted) { | |
5225 | pthread_mutex_unlock(&ua_sess->lock); | |
5226 | continue; | |
5227 | } | |
5228 | ||
55cc08a6 | 5229 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5230 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5231 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5232 | if (ua_chan_node == NULL) { |
d0b96690 | 5233 | goto next_app; |
55cc08a6 DG |
5234 | } |
5235 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5236 | node); | |
c9edf082 | 5237 | ret = create_ust_app_channel_context(ua_chan, &uctx->ctx, app); |
55cc08a6 | 5238 | if (ret < 0) { |
d0b96690 | 5239 | goto next_app; |
55cc08a6 | 5240 | } |
d0b96690 DG |
5241 | next_app: |
5242 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5243 | } |
5244 | ||
55cc08a6 | 5245 | rcu_read_unlock(); |
76d45b40 DG |
5246 | return ret; |
5247 | } | |
7f79d3a1 | 5248 | |
d0b96690 DG |
5249 | /* |
5250 | * Receive registration and populate the given msg structure. | |
5251 | * | |
5252 | * On success return 0 else a negative value returned by the ustctl call. | |
5253 | */ | |
5254 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5255 | { | |
5256 | int ret; | |
5257 | uint32_t pid, ppid, uid, gid; | |
5258 | ||
5259 | assert(msg); | |
5260 | ||
5261 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5262 | &pid, &ppid, &uid, &gid, | |
5263 | &msg->bits_per_long, | |
5264 | &msg->uint8_t_alignment, | |
5265 | &msg->uint16_t_alignment, | |
5266 | &msg->uint32_t_alignment, | |
5267 | &msg->uint64_t_alignment, | |
5268 | &msg->long_alignment, | |
5269 | &msg->byte_order, | |
5270 | msg->name); | |
5271 | if (ret < 0) { | |
5272 | switch (-ret) { | |
5273 | case EPIPE: | |
5274 | case ECONNRESET: | |
5275 | case LTTNG_UST_ERR_EXITING: | |
5276 | DBG3("UST app recv reg message failed. Application died"); | |
5277 | break; | |
5278 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5279 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5280 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5281 | LTTNG_UST_ABI_MINOR_VERSION); | |
5282 | break; | |
5283 | default: | |
5284 | ERR("UST app recv reg message failed with ret %d", ret); | |
5285 | break; | |
5286 | } | |
5287 | goto error; | |
5288 | } | |
5289 | msg->pid = (pid_t) pid; | |
5290 | msg->ppid = (pid_t) ppid; | |
5291 | msg->uid = (uid_t) uid; | |
5292 | msg->gid = (gid_t) gid; | |
5293 | ||
5294 | error: | |
5295 | return ret; | |
5296 | } | |
5297 | ||
10b56aef MD |
5298 | /* |
5299 | * Return a ust app session object using the application object and the | |
5300 | * session object descriptor has a key. If not found, NULL is returned. | |
5301 | * A RCU read side lock MUST be acquired when calling this function. | |
5302 | */ | |
5303 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5304 | int objd) | |
5305 | { | |
5306 | struct lttng_ht_node_ulong *node; | |
5307 | struct lttng_ht_iter iter; | |
5308 | struct ust_app_session *ua_sess = NULL; | |
5309 | ||
5310 | assert(app); | |
5311 | ||
5312 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5313 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5314 | if (node == NULL) { | |
5315 | DBG2("UST app session find by objd %d not found", objd); | |
5316 | goto error; | |
5317 | } | |
5318 | ||
5319 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5320 | ||
5321 | error: | |
5322 | return ua_sess; | |
5323 | } | |
5324 | ||
d88aee68 DG |
5325 | /* |
5326 | * Return a ust app channel object using the application object and the channel | |
5327 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5328 | * lock MUST be acquired before calling this function. | |
5329 | */ | |
d0b96690 DG |
5330 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5331 | int objd) | |
5332 | { | |
5333 | struct lttng_ht_node_ulong *node; | |
5334 | struct lttng_ht_iter iter; | |
5335 | struct ust_app_channel *ua_chan = NULL; | |
5336 | ||
5337 | assert(app); | |
5338 | ||
5339 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5340 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5341 | if (node == NULL) { | |
5342 | DBG2("UST app channel find by objd %d not found", objd); | |
5343 | goto error; | |
5344 | } | |
5345 | ||
5346 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5347 | ||
5348 | error: | |
5349 | return ua_chan; | |
5350 | } | |
5351 | ||
d88aee68 DG |
5352 | /* |
5353 | * Reply to a register channel notification from an application on the notify | |
5354 | * socket. The channel metadata is also created. | |
5355 | * | |
5356 | * The session UST registry lock is acquired in this function. | |
5357 | * | |
5358 | * On success 0 is returned else a negative value. | |
5359 | */ | |
8eede835 | 5360 | static int reply_ust_register_channel(int sock, int cobjd, |
d0b96690 DG |
5361 | size_t nr_fields, struct ustctl_field *fields) |
5362 | { | |
5363 | int ret, ret_code = 0; | |
294e218e | 5364 | uint32_t chan_id; |
7972aab2 | 5365 | uint64_t chan_reg_key; |
d0b96690 DG |
5366 | enum ustctl_channel_header type; |
5367 | struct ust_app *app; | |
5368 | struct ust_app_channel *ua_chan; | |
5369 | struct ust_app_session *ua_sess; | |
7972aab2 | 5370 | struct ust_registry_session *registry; |
45893984 | 5371 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5372 | |
5373 | rcu_read_lock(); | |
5374 | ||
5375 | /* Lookup application. If not found, there is a code flow error. */ | |
5376 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5377 | if (!app) { |
fad1ed2f | 5378 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5379 | sock); |
5380 | ret = 0; | |
5381 | goto error_rcu_unlock; | |
5382 | } | |
d0b96690 | 5383 | |
4950b860 | 5384 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5385 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5386 | if (!ua_chan) { |
fad1ed2f | 5387 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5388 | ret = 0; |
5389 | goto error_rcu_unlock; | |
5390 | } | |
5391 | ||
d0b96690 DG |
5392 | assert(ua_chan->session); |
5393 | ua_sess = ua_chan->session; | |
d0b96690 | 5394 | |
7972aab2 DG |
5395 | /* Get right session registry depending on the session buffer type. */ |
5396 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5397 | if (!registry) { |
5398 | DBG("Application session is being torn down. Abort event notify"); | |
5399 | ret = 0; | |
5400 | goto error_rcu_unlock; | |
5401 | }; | |
45893984 | 5402 | |
7972aab2 DG |
5403 | /* Depending on the buffer type, a different channel key is used. */ |
5404 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5405 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5406 | } else { |
7972aab2 | 5407 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5408 | } |
5409 | ||
7972aab2 DG |
5410 | pthread_mutex_lock(®istry->lock); |
5411 | ||
5412 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5413 | assert(chan_reg); | |
5414 | ||
5415 | if (!chan_reg->register_done) { | |
294e218e MD |
5416 | /* |
5417 | * TODO: eventually use the registry event count for | |
5418 | * this channel to better guess header type for per-pid | |
5419 | * buffers. | |
5420 | */ | |
5421 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
7972aab2 DG |
5422 | chan_reg->nr_ctx_fields = nr_fields; |
5423 | chan_reg->ctx_fields = fields; | |
fad1ed2f | 5424 | fields = NULL; |
7972aab2 | 5425 | chan_reg->header_type = type; |
d0b96690 | 5426 | } else { |
7972aab2 DG |
5427 | /* Get current already assigned values. */ |
5428 | type = chan_reg->header_type; | |
d0b96690 | 5429 | } |
7972aab2 DG |
5430 | /* Channel id is set during the object creation. */ |
5431 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5432 | |
5433 | /* Append to metadata */ | |
7972aab2 DG |
5434 | if (!chan_reg->metadata_dumped) { |
5435 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5436 | if (ret_code) { |
5437 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5438 | goto reply; | |
5439 | } | |
5440 | } | |
5441 | ||
5442 | reply: | |
7972aab2 DG |
5443 | DBG3("UST app replying to register channel key %" PRIu64 |
5444 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5445 | ret_code); | |
d0b96690 DG |
5446 | |
5447 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5448 | if (ret < 0) { | |
5449 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5450 | ERR("UST app reply channel failed with ret %d", ret); | |
5451 | } else { | |
5452 | DBG3("UST app reply channel failed. Application died"); | |
5453 | } | |
5454 | goto error; | |
5455 | } | |
5456 | ||
7972aab2 DG |
5457 | /* This channel registry registration is completed. */ |
5458 | chan_reg->register_done = 1; | |
5459 | ||
d0b96690 | 5460 | error: |
7972aab2 | 5461 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5462 | error_rcu_unlock: |
d0b96690 | 5463 | rcu_read_unlock(); |
fad1ed2f | 5464 | free(fields); |
d0b96690 DG |
5465 | return ret; |
5466 | } | |
5467 | ||
d88aee68 DG |
5468 | /* |
5469 | * Add event to the UST channel registry. When the event is added to the | |
5470 | * registry, the metadata is also created. Once done, this replies to the | |
5471 | * application with the appropriate error code. | |
5472 | * | |
5473 | * The session UST registry lock is acquired in the function. | |
5474 | * | |
5475 | * On success 0 is returned else a negative value. | |
5476 | */ | |
d0b96690 | 5477 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5478 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5479 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5480 | { |
5481 | int ret, ret_code; | |
5482 | uint32_t event_id = 0; | |
7972aab2 | 5483 | uint64_t chan_reg_key; |
d0b96690 DG |
5484 | struct ust_app *app; |
5485 | struct ust_app_channel *ua_chan; | |
5486 | struct ust_app_session *ua_sess; | |
7972aab2 | 5487 | struct ust_registry_session *registry; |
d0b96690 DG |
5488 | |
5489 | rcu_read_lock(); | |
5490 | ||
5491 | /* Lookup application. If not found, there is a code flow error. */ | |
5492 | app = find_app_by_notify_sock(sock); | |
d88aee68 | 5493 | if (!app) { |
fad1ed2f | 5494 | DBG("Application socket %d is being torn down. Abort event notify", |
d88aee68 DG |
5495 | sock); |
5496 | ret = 0; | |
5497 | goto error_rcu_unlock; | |
5498 | } | |
d0b96690 | 5499 | |
4950b860 | 5500 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5501 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 | 5502 | if (!ua_chan) { |
fad1ed2f | 5503 | DBG("Application channel is being torn down. Abort event notify"); |
4950b860 MD |
5504 | ret = 0; |
5505 | goto error_rcu_unlock; | |
5506 | } | |
5507 | ||
d0b96690 DG |
5508 | assert(ua_chan->session); |
5509 | ua_sess = ua_chan->session; | |
5510 | ||
7972aab2 | 5511 | registry = get_session_registry(ua_sess); |
fad1ed2f JR |
5512 | if (!registry) { |
5513 | DBG("Application session is being torn down. Abort event notify"); | |
5514 | ret = 0; | |
5515 | goto error_rcu_unlock; | |
5516 | } | |
7972aab2 DG |
5517 | |
5518 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5519 | chan_reg_key = ua_chan->tracing_channel_id; | |
5520 | } else { | |
5521 | chan_reg_key = ua_chan->key; | |
5522 | } | |
5523 | ||
5524 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5525 | |
d5d629b5 DG |
5526 | /* |
5527 | * From this point on, this call acquires the ownership of the sig, fields | |
5528 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5529 | * three variables MUST NOT be read/write after this. | |
5530 | */ | |
7972aab2 | 5531 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5532 | sobjd, cobjd, name, sig, nr_fields, fields, |
5533 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5534 | &event_id, app); | |
fad1ed2f JR |
5535 | sig = NULL; |
5536 | fields = NULL; | |
5537 | model_emf_uri = NULL; | |
d0b96690 DG |
5538 | |
5539 | /* | |
5540 | * The return value is returned to ustctl so in case of an error, the | |
5541 | * application can be notified. In case of an error, it's important not to | |
5542 | * return a negative error or else the application will get closed. | |
5543 | */ | |
5544 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5545 | if (ret < 0) { | |
5546 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5547 | ERR("UST app reply event failed with ret %d", ret); | |
5548 | } else { | |
5549 | DBG3("UST app reply event failed. Application died"); | |
5550 | } | |
5551 | /* | |
5552 | * No need to wipe the create event since the application socket will | |
5553 | * get close on error hence cleaning up everything by itself. | |
5554 | */ | |
5555 | goto error; | |
5556 | } | |
5557 | ||
7972aab2 DG |
5558 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5559 | name, event_id); | |
d88aee68 | 5560 | |
d0b96690 | 5561 | error: |
7972aab2 | 5562 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5563 | error_rcu_unlock: |
d0b96690 | 5564 | rcu_read_unlock(); |
fad1ed2f JR |
5565 | free(sig); |
5566 | free(fields); | |
5567 | free(model_emf_uri); | |
d0b96690 DG |
5568 | return ret; |
5569 | } | |
5570 | ||
10b56aef MD |
5571 | /* |
5572 | * Add enum to the UST session registry. Once done, this replies to the | |
5573 | * application with the appropriate error code. | |
5574 | * | |
5575 | * The session UST registry lock is acquired within this function. | |
5576 | * | |
5577 | * On success 0 is returned else a negative value. | |
5578 | */ | |
5579 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5580 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5581 | { | |
5582 | int ret = 0, ret_code; | |
5583 | struct ust_app *app; | |
5584 | struct ust_app_session *ua_sess; | |
5585 | struct ust_registry_session *registry; | |
5586 | uint64_t enum_id = -1ULL; | |
5587 | ||
5588 | rcu_read_lock(); | |
5589 | ||
5590 | /* Lookup application. If not found, there is a code flow error. */ | |
5591 | app = find_app_by_notify_sock(sock); | |
5592 | if (!app) { | |
5593 | /* Return an error since this is not an error */ | |
5594 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5595 | sock); | |
5596 | free(entries); | |
5597 | goto error_rcu_unlock; | |
5598 | } | |
5599 | ||
5600 | /* Lookup session by UST object descriptor. */ | |
5601 | ua_sess = find_session_by_objd(app, sobjd); | |
5602 | if (!ua_sess) { | |
5603 | /* Return an error since this is not an error */ | |
fad1ed2f | 5604 | DBG("Application session is being torn down (session not found). Aborting enum registration."); |
10b56aef MD |
5605 | free(entries); |
5606 | goto error_rcu_unlock; | |
5607 | } | |
5608 | ||
5609 | registry = get_session_registry(ua_sess); | |
fad1ed2f JR |
5610 | if (!registry) { |
5611 | DBG("Application session is being torn down (registry not found). Aborting enum registration."); | |
5612 | free(entries); | |
5613 | goto error_rcu_unlock; | |
5614 | } | |
10b56aef MD |
5615 | |
5616 | pthread_mutex_lock(®istry->lock); | |
5617 | ||
5618 | /* | |
5619 | * From this point on, the callee acquires the ownership of | |
5620 | * entries. The variable entries MUST NOT be read/written after | |
5621 | * call. | |
5622 | */ | |
5623 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5624 | entries, nr_entries, &enum_id); | |
5625 | entries = NULL; | |
5626 | ||
5627 | /* | |
5628 | * The return value is returned to ustctl so in case of an error, the | |
5629 | * application can be notified. In case of an error, it's important not to | |
5630 | * return a negative error or else the application will get closed. | |
5631 | */ | |
5632 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5633 | if (ret < 0) { | |
5634 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5635 | ERR("UST app reply enum failed with ret %d", ret); | |
5636 | } else { | |
5637 | DBG3("UST app reply enum failed. Application died"); | |
5638 | } | |
5639 | /* | |
5640 | * No need to wipe the create enum since the application socket will | |
5641 | * get close on error hence cleaning up everything by itself. | |
5642 | */ | |
5643 | goto error; | |
5644 | } | |
5645 | ||
5646 | DBG3("UST registry enum %s added successfully or already found", name); | |
5647 | ||
5648 | error: | |
5649 | pthread_mutex_unlock(®istry->lock); | |
5650 | error_rcu_unlock: | |
5651 | rcu_read_unlock(); | |
5652 | return ret; | |
5653 | } | |
5654 | ||
d88aee68 DG |
5655 | /* |
5656 | * Handle application notification through the given notify socket. | |
5657 | * | |
5658 | * Return 0 on success or else a negative value. | |
5659 | */ | |
d0b96690 DG |
5660 | int ust_app_recv_notify(int sock) |
5661 | { | |
5662 | int ret; | |
5663 | enum ustctl_notify_cmd cmd; | |
5664 | ||
5665 | DBG3("UST app receiving notify from sock %d", sock); | |
5666 | ||
5667 | ret = ustctl_recv_notify(sock, &cmd); | |
5668 | if (ret < 0) { | |
5669 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5670 | ERR("UST app recv notify failed with ret %d", ret); | |
5671 | } else { | |
5672 | DBG3("UST app recv notify failed. Application died"); | |
5673 | } | |
5674 | goto error; | |
5675 | } | |
5676 | ||
5677 | switch (cmd) { | |
5678 | case USTCTL_NOTIFY_CMD_EVENT: | |
5679 | { | |
2106efa0 | 5680 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5681 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5682 | size_t nr_fields; | |
5683 | struct ustctl_field *fields; | |
5684 | ||
5685 | DBG2("UST app ustctl register event received"); | |
5686 | ||
2106efa0 PP |
5687 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5688 | &loglevel_value, &sig, &nr_fields, &fields, | |
5689 | &model_emf_uri); | |
d0b96690 DG |
5690 | if (ret < 0) { |
5691 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5692 | ERR("UST app recv event failed with ret %d", ret); | |
5693 | } else { | |
5694 | DBG3("UST app recv event failed. Application died"); | |
5695 | } | |
5696 | goto error; | |
5697 | } | |
5698 | ||
d5d629b5 DG |
5699 | /* |
5700 | * Add event to the UST registry coming from the notify socket. This | |
5701 | * call will free if needed the sig, fields and model_emf_uri. This | |
5702 | * code path loses the ownsership of these variables and transfer them | |
5703 | * to the this function. | |
5704 | */ | |
d0b96690 | 5705 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5706 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5707 | if (ret < 0) { |
5708 | goto error; | |
5709 | } | |
5710 | ||
5711 | break; | |
5712 | } | |
5713 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5714 | { | |
5715 | int sobjd, cobjd; | |
5716 | size_t nr_fields; | |
5717 | struct ustctl_field *fields; | |
5718 | ||
5719 | DBG2("UST app ustctl register channel received"); | |
5720 | ||
5721 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5722 | &fields); | |
5723 | if (ret < 0) { | |
5724 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5725 | ERR("UST app recv channel failed with ret %d", ret); | |
5726 | } else { | |
5727 | DBG3("UST app recv channel failed. Application died"); | |
5728 | } | |
5729 | goto error; | |
5730 | } | |
5731 | ||
d5d629b5 DG |
5732 | /* |
5733 | * The fields ownership are transfered to this function call meaning | |
5734 | * that if needed it will be freed. After this, it's invalid to access | |
5735 | * fields or clean it up. | |
5736 | */ | |
8eede835 | 5737 | ret = reply_ust_register_channel(sock, cobjd, nr_fields, |
d0b96690 DG |
5738 | fields); |
5739 | if (ret < 0) { | |
5740 | goto error; | |
5741 | } | |
5742 | ||
5743 | break; | |
5744 | } | |
10b56aef MD |
5745 | case USTCTL_NOTIFY_CMD_ENUM: |
5746 | { | |
5747 | int sobjd; | |
5748 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5749 | size_t nr_entries; | |
5750 | struct ustctl_enum_entry *entries; | |
5751 | ||
5752 | DBG2("UST app ustctl register enum received"); | |
5753 | ||
5754 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5755 | &entries, &nr_entries); | |
5756 | if (ret < 0) { | |
5757 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5758 | ERR("UST app recv enum failed with ret %d", ret); | |
5759 | } else { | |
5760 | DBG3("UST app recv enum failed. Application died"); | |
5761 | } | |
5762 | goto error; | |
5763 | } | |
5764 | ||
5765 | /* Callee assumes ownership of entries */ | |
5766 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5767 | entries, nr_entries); | |
5768 | if (ret < 0) { | |
5769 | goto error; | |
5770 | } | |
5771 | ||
5772 | break; | |
5773 | } | |
d0b96690 DG |
5774 | default: |
5775 | /* Should NEVER happen. */ | |
5776 | assert(0); | |
5777 | } | |
5778 | ||
5779 | error: | |
5780 | return ret; | |
5781 | } | |
d88aee68 DG |
5782 | |
5783 | /* | |
5784 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5785 | * corresponding application. On failure, the call_rcu to close the socket is | |
5786 | * executed. If an application is found, it tries to delete it from the notify | |
5787 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5788 | * | |
5789 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5790 | * call RCU is not done but the rest of the cleanup is. | |
5791 | */ | |
5792 | void ust_app_notify_sock_unregister(int sock) | |
5793 | { | |
5794 | int err_enomem = 0; | |
5795 | struct lttng_ht_iter iter; | |
5796 | struct ust_app *app; | |
5797 | struct ust_app_notify_sock_obj *obj; | |
5798 | ||
5799 | assert(sock >= 0); | |
5800 | ||
5801 | rcu_read_lock(); | |
5802 | ||
5803 | obj = zmalloc(sizeof(*obj)); | |
5804 | if (!obj) { | |
5805 | /* | |
5806 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5807 | * procedure but the call_rcu will not be called. In this case, we | |
5808 | * accept the fd leak rather than possibly creating an unsynchronized | |
5809 | * state between threads. | |
5810 | * | |
5811 | * TODO: The notify object should be created once the notify socket is | |
5812 | * registered and stored independantely from the ust app object. The | |
5813 | * tricky part is to synchronize the teardown of the application and | |
5814 | * this notify object. Let's keep that in mind so we can avoid this | |
5815 | * kind of shenanigans with ENOMEM in the teardown path. | |
5816 | */ | |
5817 | err_enomem = 1; | |
5818 | } else { | |
5819 | obj->fd = sock; | |
5820 | } | |
5821 | ||
5822 | DBG("UST app notify socket unregister %d", sock); | |
5823 | ||
5824 | /* | |
5825 | * Lookup application by notify socket. If this fails, this means that the | |
5826 | * hash table delete has already been done by the application | |
5827 | * unregistration process so we can safely close the notify socket in a | |
5828 | * call RCU. | |
5829 | */ | |
5830 | app = find_app_by_notify_sock(sock); | |
5831 | if (!app) { | |
5832 | goto close_socket; | |
5833 | } | |
5834 | ||
5835 | iter.iter.node = &app->notify_sock_n.node; | |
5836 | ||
5837 | /* | |
5838 | * Whatever happens here either we fail or succeed, in both cases we have | |
5839 | * to close the socket after a grace period to continue to the call RCU | |
5840 | * here. If the deletion is successful, the application is not visible | |
5841 | * anymore by other threads and is it fails it means that it was already | |
5842 | * deleted from the hash table so either way we just have to close the | |
5843 | * socket. | |
5844 | */ | |
5845 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5846 | ||
5847 | close_socket: | |
5848 | rcu_read_unlock(); | |
5849 | ||
5850 | /* | |
5851 | * Close socket after a grace period to avoid for the socket to be reused | |
5852 | * before the application object is freed creating potential race between | |
5853 | * threads trying to add unique in the global hash table. | |
5854 | */ | |
5855 | if (!err_enomem) { | |
5856 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5857 | } | |
5858 | } | |
f45e313d DG |
5859 | |
5860 | /* | |
5861 | * Destroy a ust app data structure and free its memory. | |
5862 | */ | |
5863 | void ust_app_destroy(struct ust_app *app) | |
5864 | { | |
5865 | if (!app) { | |
5866 | return; | |
5867 | } | |
5868 | ||
5869 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5870 | } | |
6dc3064a DG |
5871 | |
5872 | /* | |
5873 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5874 | * output. | |
5875 | * | |
9a654598 | 5876 | * Returns LTTNG_OK on success or a LTTNG_ERR error code. |
6dc3064a | 5877 | */ |
fb9a95c4 JG |
5878 | enum lttng_error_code ust_app_snapshot_record( |
5879 | const struct ltt_ust_session *usess, | |
348a81dc | 5880 | const struct consumer_output *output, int wait, |
d07ceecd | 5881 | uint64_t nb_packets_per_stream) |
6dc3064a DG |
5882 | { |
5883 | int ret = 0; | |
9a654598 | 5884 | enum lttng_error_code status = LTTNG_OK; |
6dc3064a DG |
5885 | struct lttng_ht_iter iter; |
5886 | struct ust_app *app; | |
af706bb7 | 5887 | char pathname[PATH_MAX]; |
6dc3064a DG |
5888 | |
5889 | assert(usess); | |
5890 | assert(output); | |
5891 | ||
5892 | rcu_read_lock(); | |
5893 | ||
8c924c7b MD |
5894 | switch (usess->buffer_type) { |
5895 | case LTTNG_BUFFER_PER_UID: | |
5896 | { | |
5897 | struct buffer_reg_uid *reg; | |
6dc3064a | 5898 | |
8c924c7b MD |
5899 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5900 | struct buffer_reg_channel *reg_chan; | |
5901 | struct consumer_socket *socket; | |
6dc3064a | 5902 | |
2b269489 JR |
5903 | if (!reg->registry->reg.ust->metadata_key) { |
5904 | /* Skip since no metadata is present */ | |
5905 | continue; | |
5906 | } | |
5907 | ||
8c924c7b MD |
5908 | /* Get consumer socket to use to push the metadata.*/ |
5909 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5910 | usess->consumer); | |
5911 | if (!socket) { | |
9a654598 | 5912 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5913 | goto error; |
5914 | } | |
6dc3064a | 5915 | |
8c924c7b | 5916 | memset(pathname, 0, sizeof(pathname)); |
d2956687 JG |
5917 | /* |
5918 | * DEFAULT_UST_TRACE_UID_PATH already contains a path | |
5919 | * separator. | |
5920 | */ | |
8c924c7b | 5921 | ret = snprintf(pathname, sizeof(pathname), |
d2956687 | 5922 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH, |
8c924c7b MD |
5923 | reg->uid, reg->bits_per_long); |
5924 | if (ret < 0) { | |
5925 | PERROR("snprintf snapshot path"); | |
9a654598 | 5926 | status = LTTNG_ERR_INVALID; |
8c924c7b MD |
5927 | goto error; |
5928 | } | |
5929 | ||
d2956687 | 5930 | /* Add the UST default trace dir to path. */ |
8c924c7b MD |
5931 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5932 | reg_chan, node.node) { | |
9a654598 | 5933 | status = consumer_snapshot_channel(socket, |
e098433c JG |
5934 | reg_chan->consumer_key, |
5935 | output, 0, usess->uid, | |
5936 | usess->gid, pathname, wait, | |
d2956687 | 5937 | nb_packets_per_stream); |
9a654598 | 5938 | if (status != LTTNG_OK) { |
8c924c7b MD |
5939 | goto error; |
5940 | } | |
5941 | } | |
9a654598 | 5942 | status = consumer_snapshot_channel(socket, |
68808f4e | 5943 | reg->registry->reg.ust->metadata_key, output, 1, |
d2956687 | 5944 | usess->uid, usess->gid, pathname, wait, 0); |
9a654598 | 5945 | if (status != LTTNG_OK) { |
8c924c7b MD |
5946 | goto error; |
5947 | } | |
af706bb7 | 5948 | } |
8c924c7b MD |
5949 | break; |
5950 | } | |
5951 | case LTTNG_BUFFER_PER_PID: | |
5952 | { | |
5953 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5954 | struct consumer_socket *socket; | |
5955 | struct lttng_ht_iter chan_iter; | |
5956 | struct ust_app_channel *ua_chan; | |
5957 | struct ust_app_session *ua_sess; | |
5958 | struct ust_registry_session *registry; | |
5959 | ||
5960 | ua_sess = lookup_session_by_app(usess, app); | |
5961 | if (!ua_sess) { | |
5962 | /* Session not associated with this app. */ | |
5963 | continue; | |
5964 | } | |
af706bb7 | 5965 | |
8c924c7b MD |
5966 | /* Get the right consumer socket for the application. */ |
5967 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
348a81dc | 5968 | output); |
8c924c7b | 5969 | if (!socket) { |
9a654598 | 5970 | status = LTTNG_ERR_INVALID; |
5c786ded JD |
5971 | goto error; |
5972 | } | |
5973 | ||
8c924c7b MD |
5974 | /* Add the UST default trace dir to path. */ |
5975 | memset(pathname, 0, sizeof(pathname)); | |
d2956687 | 5976 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "%s", |
8c924c7b | 5977 | ua_sess->path); |
6dc3064a | 5978 | if (ret < 0) { |
9a654598 | 5979 | status = LTTNG_ERR_INVALID; |
8c924c7b | 5980 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5981 | goto error; |
5982 | } | |
6dc3064a | 5983 | |
d2956687 | 5984 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
8c924c7b | 5985 | ua_chan, node.node) { |
9a654598 | 5986 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
5987 | ua_chan->key, output, 0, |
5988 | ua_sess->effective_credentials | |
5989 | .uid, | |
5990 | ua_sess->effective_credentials | |
5991 | .gid, | |
e098433c | 5992 | pathname, wait, |
d2956687 | 5993 | nb_packets_per_stream); |
9a654598 JG |
5994 | switch (status) { |
5995 | case LTTNG_OK: | |
5996 | break; | |
5997 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
5998 | continue; | |
5999 | default: | |
8c924c7b MD |
6000 | goto error; |
6001 | } | |
6002 | } | |
6003 | ||
6004 | registry = get_session_registry(ua_sess); | |
fad1ed2f | 6005 | if (!registry) { |
9bbfb88c MD |
6006 | DBG("Application session is being torn down. Skip application."); |
6007 | continue; | |
fad1ed2f | 6008 | } |
9a654598 | 6009 | status = consumer_snapshot_channel(socket, |
470cc211 JG |
6010 | registry->metadata_key, output, 1, |
6011 | ua_sess->effective_credentials.uid, | |
6012 | ua_sess->effective_credentials.gid, | |
d2956687 | 6013 | pathname, wait, 0); |
9a654598 JG |
6014 | switch (status) { |
6015 | case LTTNG_OK: | |
6016 | break; | |
6017 | case LTTNG_ERR_CHAN_NOT_FOUND: | |
6018 | continue; | |
6019 | default: | |
8c924c7b MD |
6020 | goto error; |
6021 | } | |
6022 | } | |
6023 | break; | |
6024 | } | |
6025 | default: | |
6026 | assert(0); | |
6027 | break; | |
6dc3064a DG |
6028 | } |
6029 | ||
6030 | error: | |
6031 | rcu_read_unlock(); | |
9a654598 | 6032 | return status; |
6dc3064a | 6033 | } |
5c786ded JD |
6034 | |
6035 | /* | |
d07ceecd | 6036 | * Return the size taken by one more packet per stream. |
5c786ded | 6037 | */ |
fb9a95c4 JG |
6038 | uint64_t ust_app_get_size_one_more_packet_per_stream( |
6039 | const struct ltt_ust_session *usess, uint64_t cur_nr_packets) | |
5c786ded | 6040 | { |
d07ceecd | 6041 | uint64_t tot_size = 0; |
5c786ded JD |
6042 | struct ust_app *app; |
6043 | struct lttng_ht_iter iter; | |
6044 | ||
6045 | assert(usess); | |
6046 | ||
6047 | switch (usess->buffer_type) { | |
6048 | case LTTNG_BUFFER_PER_UID: | |
6049 | { | |
6050 | struct buffer_reg_uid *reg; | |
6051 | ||
6052 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6053 | struct buffer_reg_channel *reg_chan; | |
6054 | ||
b7064eaa | 6055 | rcu_read_lock(); |
5c786ded JD |
6056 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
6057 | reg_chan, node.node) { | |
d07ceecd MD |
6058 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
6059 | /* | |
6060 | * Don't take channel into account if we | |
6061 | * already grab all its packets. | |
6062 | */ | |
6063 | continue; | |
6064 | } | |
6065 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 6066 | } |
b7064eaa | 6067 | rcu_read_unlock(); |
5c786ded JD |
6068 | } |
6069 | break; | |
6070 | } | |
6071 | case LTTNG_BUFFER_PER_PID: | |
6072 | { | |
6073 | rcu_read_lock(); | |
6074 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6075 | struct ust_app_channel *ua_chan; | |
6076 | struct ust_app_session *ua_sess; | |
6077 | struct lttng_ht_iter chan_iter; | |
6078 | ||
6079 | ua_sess = lookup_session_by_app(usess, app); | |
6080 | if (!ua_sess) { | |
6081 | /* Session not associated with this app. */ | |
6082 | continue; | |
6083 | } | |
6084 | ||
6085 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6086 | ua_chan, node.node) { | |
d07ceecd MD |
6087 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
6088 | /* | |
6089 | * Don't take channel into account if we | |
6090 | * already grab all its packets. | |
6091 | */ | |
6092 | continue; | |
6093 | } | |
6094 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
6095 | } |
6096 | } | |
6097 | rcu_read_unlock(); | |
6098 | break; | |
6099 | } | |
6100 | default: | |
6101 | assert(0); | |
6102 | break; | |
6103 | } | |
6104 | ||
d07ceecd | 6105 | return tot_size; |
5c786ded | 6106 | } |
fb83fe64 JD |
6107 | |
6108 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6109 | struct cds_list_head *buffer_reg_uid_list, | |
6110 | struct consumer_output *consumer, uint64_t uchan_id, | |
6111 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6112 | { | |
6113 | int ret; | |
6114 | uint64_t consumer_chan_key; | |
6115 | ||
70dd8162 MD |
6116 | *discarded = 0; |
6117 | *lost = 0; | |
6118 | ||
fb83fe64 | 6119 | ret = buffer_reg_uid_consumer_channel_key( |
76604852 | 6120 | buffer_reg_uid_list, uchan_id, &consumer_chan_key); |
fb83fe64 | 6121 | if (ret < 0) { |
70dd8162 MD |
6122 | /* Not found */ |
6123 | ret = 0; | |
fb83fe64 JD |
6124 | goto end; |
6125 | } | |
6126 | ||
6127 | if (overwrite) { | |
6128 | ret = consumer_get_lost_packets(ust_session_id, | |
6129 | consumer_chan_key, consumer, lost); | |
6130 | } else { | |
6131 | ret = consumer_get_discarded_events(ust_session_id, | |
6132 | consumer_chan_key, consumer, discarded); | |
6133 | } | |
6134 | ||
6135 | end: | |
6136 | return ret; | |
6137 | } | |
6138 | ||
6139 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6140 | struct ltt_ust_channel *uchan, | |
6141 | struct consumer_output *consumer, int overwrite, | |
6142 | uint64_t *discarded, uint64_t *lost) | |
6143 | { | |
6144 | int ret = 0; | |
6145 | struct lttng_ht_iter iter; | |
6146 | struct lttng_ht_node_str *ua_chan_node; | |
6147 | struct ust_app *app; | |
6148 | struct ust_app_session *ua_sess; | |
6149 | struct ust_app_channel *ua_chan; | |
6150 | ||
70dd8162 MD |
6151 | *discarded = 0; |
6152 | *lost = 0; | |
6153 | ||
fb83fe64 JD |
6154 | rcu_read_lock(); |
6155 | /* | |
70dd8162 MD |
6156 | * Iterate over every registered applications. Sum counters for |
6157 | * all applications containing requested session and channel. | |
fb83fe64 JD |
6158 | */ |
6159 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6160 | struct lttng_ht_iter uiter; | |
6161 | ||
6162 | ua_sess = lookup_session_by_app(usess, app); | |
6163 | if (ua_sess == NULL) { | |
6164 | continue; | |
6165 | } | |
6166 | ||
6167 | /* Get channel */ | |
ee022399 | 6168 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6169 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6170 | /* If the session is found for the app, the channel must be there */ | |
6171 | assert(ua_chan_node); | |
6172 | ||
6173 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6174 | ||
6175 | if (overwrite) { | |
70dd8162 MD |
6176 | uint64_t _lost; |
6177 | ||
fb83fe64 | 6178 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, |
70dd8162 MD |
6179 | consumer, &_lost); |
6180 | if (ret < 0) { | |
6181 | break; | |
6182 | } | |
6183 | (*lost) += _lost; | |
fb83fe64 | 6184 | } else { |
70dd8162 MD |
6185 | uint64_t _discarded; |
6186 | ||
fb83fe64 | 6187 | ret = consumer_get_discarded_events(usess->id, |
70dd8162 MD |
6188 | ua_chan->key, consumer, &_discarded); |
6189 | if (ret < 0) { | |
6190 | break; | |
6191 | } | |
6192 | (*discarded) += _discarded; | |
fb83fe64 | 6193 | } |
fb83fe64 JD |
6194 | } |
6195 | ||
fb83fe64 JD |
6196 | rcu_read_unlock(); |
6197 | return ret; | |
6198 | } | |
c2561365 JD |
6199 | |
6200 | static | |
6201 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6202 | struct ust_app *app) | |
6203 | { | |
6204 | int ret = 0; | |
6205 | struct ust_app_session *ua_sess; | |
6206 | ||
6207 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6208 | ||
6209 | rcu_read_lock(); | |
6210 | ||
6211 | ua_sess = lookup_session_by_app(usess, app); | |
6212 | if (ua_sess == NULL) { | |
6213 | /* The session is in teardown process. Ignore and continue. */ | |
6214 | goto end; | |
6215 | } | |
6216 | ||
6217 | pthread_mutex_lock(&ua_sess->lock); | |
6218 | ||
6219 | if (ua_sess->deleted) { | |
6220 | goto end_unlock; | |
6221 | } | |
6222 | ||
6223 | pthread_mutex_lock(&app->sock_lock); | |
6224 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6225 | pthread_mutex_unlock(&app->sock_lock); | |
6226 | ||
6227 | end_unlock: | |
6228 | pthread_mutex_unlock(&ua_sess->lock); | |
6229 | ||
6230 | end: | |
6231 | rcu_read_unlock(); | |
6232 | health_code_update(); | |
6233 | return ret; | |
6234 | } | |
6235 | ||
6236 | /* | |
6237 | * Regenerate the statedump for each app in the session. | |
6238 | */ | |
6239 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6240 | { | |
6241 | int ret = 0; | |
6242 | struct lttng_ht_iter iter; | |
6243 | struct ust_app *app; | |
6244 | ||
6245 | DBG("Regenerating the metadata for all UST apps"); | |
6246 | ||
6247 | rcu_read_lock(); | |
6248 | ||
6249 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6250 | if (!app->compatible) { | |
6251 | continue; | |
6252 | } | |
6253 | ||
6254 | ret = ust_app_regenerate_statedump(usess, app); | |
6255 | if (ret < 0) { | |
6256 | /* Continue to the next app even on error */ | |
6257 | continue; | |
6258 | } | |
6259 | } | |
6260 | ||
6261 | rcu_read_unlock(); | |
6262 | ||
6263 | return 0; | |
6264 | } | |
5c408ad8 JD |
6265 | |
6266 | /* | |
6267 | * Rotate all the channels of a session. | |
6268 | * | |
6f6d3b69 | 6269 | * Return LTTNG_OK on success or else an LTTng error code. |
5c408ad8 | 6270 | */ |
6f6d3b69 | 6271 | enum lttng_error_code ust_app_rotate_session(struct ltt_session *session) |
5c408ad8 | 6272 | { |
6f6d3b69 MD |
6273 | int ret; |
6274 | enum lttng_error_code cmd_ret = LTTNG_OK; | |
5c408ad8 JD |
6275 | struct lttng_ht_iter iter; |
6276 | struct ust_app *app; | |
6277 | struct ltt_ust_session *usess = session->ust_session; | |
5c408ad8 JD |
6278 | |
6279 | assert(usess); | |
6280 | ||
6281 | rcu_read_lock(); | |
6282 | ||
6283 | switch (usess->buffer_type) { | |
6284 | case LTTNG_BUFFER_PER_UID: | |
6285 | { | |
6286 | struct buffer_reg_uid *reg; | |
6287 | ||
6288 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6289 | struct buffer_reg_channel *reg_chan; | |
6290 | struct consumer_socket *socket; | |
6291 | ||
6292 | /* Get consumer socket to use to push the metadata.*/ | |
6293 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
6294 | usess->consumer); | |
6295 | if (!socket) { | |
6f6d3b69 | 6296 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6297 | goto error; |
6298 | } | |
6299 | ||
5c408ad8 JD |
6300 | /* Rotate the data channels. */ |
6301 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
6302 | reg_chan, node.node) { | |
5c408ad8 JD |
6303 | ret = consumer_rotate_channel(socket, |
6304 | reg_chan->consumer_key, | |
6305 | usess->uid, usess->gid, | |
d2956687 JG |
6306 | usess->consumer, |
6307 | /* is_metadata_channel */ false); | |
5c408ad8 | 6308 | if (ret < 0) { |
6f6d3b69 | 6309 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6310 | goto error; |
6311 | } | |
6312 | } | |
6313 | ||
6314 | (void) push_metadata(reg->registry->reg.ust, usess->consumer); | |
6315 | ||
6316 | ret = consumer_rotate_channel(socket, | |
6317 | reg->registry->reg.ust->metadata_key, | |
6318 | usess->uid, usess->gid, | |
d2956687 JG |
6319 | usess->consumer, |
6320 | /* is_metadata_channel */ true); | |
5c408ad8 | 6321 | if (ret < 0) { |
6f6d3b69 | 6322 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; |
5c408ad8 JD |
6323 | goto error; |
6324 | } | |
5c408ad8 JD |
6325 | } |
6326 | break; | |
6327 | } | |
6328 | case LTTNG_BUFFER_PER_PID: | |
6329 | { | |
6330 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6331 | struct consumer_socket *socket; | |
6332 | struct lttng_ht_iter chan_iter; | |
6333 | struct ust_app_channel *ua_chan; | |
6334 | struct ust_app_session *ua_sess; | |
6335 | struct ust_registry_session *registry; | |
6336 | ||
6337 | ua_sess = lookup_session_by_app(usess, app); | |
6338 | if (!ua_sess) { | |
6339 | /* Session not associated with this app. */ | |
6340 | continue; | |
6341 | } | |
5c408ad8 JD |
6342 | |
6343 | /* Get the right consumer socket for the application. */ | |
6344 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
6345 | usess->consumer); | |
6346 | if (!socket) { | |
6f6d3b69 | 6347 | cmd_ret = LTTNG_ERR_INVALID; |
5c408ad8 JD |
6348 | goto error; |
6349 | } | |
6350 | ||
6351 | registry = get_session_registry(ua_sess); | |
6352 | if (!registry) { | |
6f6d3b69 MD |
6353 | DBG("Application session is being torn down. Skip application."); |
6354 | continue; | |
5c408ad8 JD |
6355 | } |
6356 | ||
5c408ad8 JD |
6357 | /* Rotate the data channels. */ |
6358 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
6359 | ua_chan, node.node) { | |
470cc211 JG |
6360 | ret = consumer_rotate_channel(socket, |
6361 | ua_chan->key, | |
6362 | ua_sess->effective_credentials | |
6363 | .uid, | |
6364 | ua_sess->effective_credentials | |
6365 | .gid, | |
d2956687 JG |
6366 | ua_sess->consumer, |
6367 | /* is_metadata_channel */ false); | |
5c408ad8 | 6368 | if (ret < 0) { |
6f6d3b69 MD |
6369 | /* Per-PID buffer and application going away. */ |
6370 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6371 | continue; | |
6372 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6373 | goto error; |
6374 | } | |
6375 | } | |
6376 | ||
6377 | /* Rotate the metadata channel. */ | |
6378 | (void) push_metadata(registry, usess->consumer); | |
470cc211 JG |
6379 | ret = consumer_rotate_channel(socket, |
6380 | registry->metadata_key, | |
6381 | ua_sess->effective_credentials.uid, | |
6382 | ua_sess->effective_credentials.gid, | |
d2956687 JG |
6383 | ua_sess->consumer, |
6384 | /* is_metadata_channel */ true); | |
5c408ad8 | 6385 | if (ret < 0) { |
6f6d3b69 MD |
6386 | /* Per-PID buffer and application going away. */ |
6387 | if (ret == -LTTNG_ERR_CHAN_NOT_FOUND) | |
6388 | continue; | |
6389 | cmd_ret = LTTNG_ERR_ROTATION_FAIL_CONSUMER; | |
5c408ad8 JD |
6390 | goto error; |
6391 | } | |
5c408ad8 JD |
6392 | } |
6393 | break; | |
6394 | } | |
6395 | default: | |
6396 | assert(0); | |
6397 | break; | |
6398 | } | |
6399 | ||
6f6d3b69 | 6400 | cmd_ret = LTTNG_OK; |
5c408ad8 JD |
6401 | |
6402 | error: | |
6403 | rcu_read_unlock(); | |
6f6d3b69 | 6404 | return cmd_ret; |
5c408ad8 | 6405 | } |
d2956687 JG |
6406 | |
6407 | enum lttng_error_code ust_app_create_channel_subdirectories( | |
6408 | const struct ltt_ust_session *usess) | |
6409 | { | |
6410 | enum lttng_error_code ret = LTTNG_OK; | |
6411 | struct lttng_ht_iter iter; | |
6412 | enum lttng_trace_chunk_status chunk_status; | |
6413 | char *pathname_index; | |
6414 | int fmt_ret; | |
6415 | ||
6416 | assert(usess->current_trace_chunk); | |
6417 | rcu_read_lock(); | |
6418 | ||
6419 | switch (usess->buffer_type) { | |
6420 | case LTTNG_BUFFER_PER_UID: | |
6421 | { | |
6422 | struct buffer_reg_uid *reg; | |
6423 | ||
6424 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
6425 | fmt_ret = asprintf(&pathname_index, | |
6426 | DEFAULT_UST_TRACE_DIR DEFAULT_UST_TRACE_UID_PATH "/" DEFAULT_INDEX_DIR, | |
6427 | reg->uid, reg->bits_per_long); | |
6428 | if (fmt_ret < 0) { | |
6429 | ERR("Failed to format channel index directory"); | |
6430 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6431 | goto error; | |
6432 | } | |
6433 | ||
6434 | /* | |
6435 | * Create the index subdirectory which will take care | |
6436 | * of implicitly creating the channel's path. | |
6437 | */ | |
6438 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6439 | usess->current_trace_chunk, | |
6440 | pathname_index); | |
6441 | free(pathname_index); | |
6442 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6443 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6444 | goto error; | |
6445 | } | |
6446 | } | |
6447 | break; | |
6448 | } | |
6449 | case LTTNG_BUFFER_PER_PID: | |
6450 | { | |
6451 | struct ust_app *app; | |
6452 | ||
6453 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
6454 | pid_n.node) { | |
6455 | struct ust_app_session *ua_sess; | |
6456 | struct ust_registry_session *registry; | |
6457 | ||
6458 | ua_sess = lookup_session_by_app(usess, app); | |
6459 | if (!ua_sess) { | |
6460 | /* Session not associated with this app. */ | |
6461 | continue; | |
6462 | } | |
6463 | ||
6464 | registry = get_session_registry(ua_sess); | |
6465 | if (!registry) { | |
6466 | DBG("Application session is being torn down. Skip application."); | |
6467 | continue; | |
6468 | } | |
6469 | ||
6470 | fmt_ret = asprintf(&pathname_index, | |
6471 | DEFAULT_UST_TRACE_DIR "%s/" DEFAULT_INDEX_DIR, | |
6472 | ua_sess->path); | |
6473 | if (fmt_ret < 0) { | |
6474 | ERR("Failed to format channel index directory"); | |
6475 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6476 | goto error; | |
6477 | } | |
6478 | /* | |
6479 | * Create the index subdirectory which will take care | |
6480 | * of implicitly creating the channel's path. | |
6481 | */ | |
6482 | chunk_status = lttng_trace_chunk_create_subdirectory( | |
6483 | usess->current_trace_chunk, | |
6484 | pathname_index); | |
6485 | free(pathname_index); | |
6486 | if (chunk_status != LTTNG_TRACE_CHUNK_STATUS_OK) { | |
6487 | ret = LTTNG_ERR_CREATE_DIR_FAIL; | |
6488 | goto error; | |
6489 | } | |
6490 | } | |
6491 | break; | |
6492 | } | |
6493 | default: | |
6494 | abort(); | |
6495 | } | |
6496 | ||
6497 | ret = LTTNG_OK; | |
6498 | error: | |
6499 | rcu_read_unlock(); | |
6500 | return ret; | |
6501 | } |