Commit | Line | Data |
---|---|---|
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" |
d80a6244 | 44 | |
c4b88406 MD |
45 | static |
46 | int ust_app_flush_app_session(struct ust_app *app, struct ust_app_session *ua_sess); | |
47 | ||
d9bf3ca4 MD |
48 | /* Next available channel key. Access under next_channel_key_lock. */ |
49 | static uint64_t _next_channel_key; | |
50 | static pthread_mutex_t next_channel_key_lock = PTHREAD_MUTEX_INITIALIZER; | |
51 | ||
52 | /* Next available session ID. Access under next_session_id_lock. */ | |
53 | static uint64_t _next_session_id; | |
54 | static pthread_mutex_t next_session_id_lock = PTHREAD_MUTEX_INITIALIZER; | |
ffe60014 DG |
55 | |
56 | /* | |
d9bf3ca4 | 57 | * Return the incremented value of next_channel_key. |
ffe60014 | 58 | */ |
d9bf3ca4 | 59 | static uint64_t get_next_channel_key(void) |
ffe60014 | 60 | { |
d9bf3ca4 MD |
61 | uint64_t ret; |
62 | ||
63 | pthread_mutex_lock(&next_channel_key_lock); | |
64 | ret = ++_next_channel_key; | |
65 | pthread_mutex_unlock(&next_channel_key_lock); | |
66 | return ret; | |
ffe60014 DG |
67 | } |
68 | ||
69 | /* | |
7972aab2 | 70 | * Return the atomically incremented value of next_session_id. |
ffe60014 | 71 | */ |
d9bf3ca4 | 72 | static uint64_t get_next_session_id(void) |
ffe60014 | 73 | { |
d9bf3ca4 MD |
74 | uint64_t ret; |
75 | ||
76 | pthread_mutex_lock(&next_session_id_lock); | |
77 | ret = ++_next_session_id; | |
78 | pthread_mutex_unlock(&next_session_id_lock); | |
79 | return ret; | |
ffe60014 DG |
80 | } |
81 | ||
d65d2de8 DG |
82 | static void copy_channel_attr_to_ustctl( |
83 | struct ustctl_consumer_channel_attr *attr, | |
84 | struct lttng_ust_channel_attr *uattr) | |
85 | { | |
86 | /* Copy event attributes since the layout is different. */ | |
87 | attr->subbuf_size = uattr->subbuf_size; | |
88 | attr->num_subbuf = uattr->num_subbuf; | |
89 | attr->overwrite = uattr->overwrite; | |
90 | attr->switch_timer_interval = uattr->switch_timer_interval; | |
91 | attr->read_timer_interval = uattr->read_timer_interval; | |
92 | attr->output = uattr->output; | |
93 | } | |
94 | ||
025faf73 DG |
95 | /* |
96 | * Match function for the hash table lookup. | |
97 | * | |
98 | * It matches an ust app event based on three attributes which are the event | |
99 | * name, the filter bytecode and the loglevel. | |
100 | */ | |
18eace3b DG |
101 | static int ht_match_ust_app_event(struct cds_lfht_node *node, const void *_key) |
102 | { | |
103 | struct ust_app_event *event; | |
104 | const struct ust_app_ht_key *key; | |
2106efa0 | 105 | int ev_loglevel_value; |
18eace3b DG |
106 | |
107 | assert(node); | |
108 | assert(_key); | |
109 | ||
110 | event = caa_container_of(node, struct ust_app_event, node.node); | |
111 | key = _key; | |
2106efa0 | 112 | ev_loglevel_value = event->attr.loglevel; |
18eace3b | 113 | |
1af53eb5 | 114 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions */ |
18eace3b DG |
115 | |
116 | /* Event name */ | |
117 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { | |
118 | goto no_match; | |
119 | } | |
120 | ||
121 | /* Event loglevel. */ | |
2106efa0 | 122 | if (ev_loglevel_value != key->loglevel_type) { |
025faf73 | 123 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
2106efa0 PP |
124 | && key->loglevel_type == 0 && |
125 | ev_loglevel_value == -1) { | |
025faf73 DG |
126 | /* |
127 | * Match is accepted. This is because on event creation, the | |
128 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and | |
129 | * -1 are accepted for this loglevel type since 0 is the one set by | |
130 | * the API when receiving an enable event. | |
131 | */ | |
132 | } else { | |
133 | goto no_match; | |
134 | } | |
18eace3b DG |
135 | } |
136 | ||
137 | /* One of the filters is NULL, fail. */ | |
138 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { | |
139 | goto no_match; | |
140 | } | |
141 | ||
025faf73 DG |
142 | if (key->filter && event->filter) { |
143 | /* Both filters exists, check length followed by the bytecode. */ | |
144 | if (event->filter->len != key->filter->len || | |
145 | memcmp(event->filter->data, key->filter->data, | |
146 | event->filter->len) != 0) { | |
147 | goto no_match; | |
148 | } | |
18eace3b DG |
149 | } |
150 | ||
1af53eb5 JI |
151 | /* One of the exclusions is NULL, fail. */ |
152 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { | |
153 | goto no_match; | |
154 | } | |
155 | ||
156 | if (key->exclusion && event->exclusion) { | |
157 | /* Both exclusions exists, check count followed by the names. */ | |
158 | if (event->exclusion->count != key->exclusion->count || | |
159 | memcmp(event->exclusion->names, key->exclusion->names, | |
160 | event->exclusion->count * LTTNG_UST_SYM_NAME_LEN) != 0) { | |
161 | goto no_match; | |
162 | } | |
163 | } | |
164 | ||
165 | ||
025faf73 | 166 | /* Match. */ |
18eace3b DG |
167 | return 1; |
168 | ||
169 | no_match: | |
170 | return 0; | |
18eace3b DG |
171 | } |
172 | ||
025faf73 DG |
173 | /* |
174 | * Unique add of an ust app event in the given ht. This uses the custom | |
175 | * ht_match_ust_app_event match function and the event name as hash. | |
176 | */ | |
d0b96690 | 177 | static void add_unique_ust_app_event(struct ust_app_channel *ua_chan, |
18eace3b DG |
178 | struct ust_app_event *event) |
179 | { | |
180 | struct cds_lfht_node *node_ptr; | |
181 | struct ust_app_ht_key key; | |
d0b96690 | 182 | struct lttng_ht *ht; |
18eace3b | 183 | |
d0b96690 DG |
184 | assert(ua_chan); |
185 | assert(ua_chan->events); | |
18eace3b DG |
186 | assert(event); |
187 | ||
d0b96690 | 188 | ht = ua_chan->events; |
18eace3b DG |
189 | key.name = event->attr.name; |
190 | key.filter = event->filter; | |
2106efa0 | 191 | key.loglevel_type = event->attr.loglevel; |
91c89f23 | 192 | key.exclusion = event->exclusion; |
18eace3b DG |
193 | |
194 | node_ptr = cds_lfht_add_unique(ht->ht, | |
195 | ht->hash_fct(event->node.key, lttng_ht_seed), | |
196 | ht_match_ust_app_event, &key, &event->node.node); | |
197 | assert(node_ptr == &event->node.node); | |
198 | } | |
199 | ||
d88aee68 DG |
200 | /* |
201 | * Close the notify socket from the given RCU head object. This MUST be called | |
202 | * through a call_rcu(). | |
203 | */ | |
204 | static void close_notify_sock_rcu(struct rcu_head *head) | |
205 | { | |
206 | int ret; | |
207 | struct ust_app_notify_sock_obj *obj = | |
208 | caa_container_of(head, struct ust_app_notify_sock_obj, head); | |
209 | ||
210 | /* Must have a valid fd here. */ | |
211 | assert(obj->fd >= 0); | |
212 | ||
213 | ret = close(obj->fd); | |
214 | if (ret) { | |
215 | ERR("close notify sock %d RCU", obj->fd); | |
216 | } | |
217 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
218 | ||
219 | free(obj); | |
220 | } | |
221 | ||
7972aab2 DG |
222 | /* |
223 | * Return the session registry according to the buffer type of the given | |
224 | * session. | |
225 | * | |
226 | * A registry per UID object MUST exists before calling this function or else | |
227 | * it assert() if not found. RCU read side lock must be acquired. | |
228 | */ | |
229 | static struct ust_registry_session *get_session_registry( | |
230 | struct ust_app_session *ua_sess) | |
231 | { | |
232 | struct ust_registry_session *registry = NULL; | |
233 | ||
234 | assert(ua_sess); | |
235 | ||
236 | switch (ua_sess->buffer_type) { | |
237 | case LTTNG_BUFFER_PER_PID: | |
238 | { | |
239 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
240 | if (!reg_pid) { | |
241 | goto error; | |
242 | } | |
243 | registry = reg_pid->registry->reg.ust; | |
244 | break; | |
245 | } | |
246 | case LTTNG_BUFFER_PER_UID: | |
247 | { | |
248 | struct buffer_reg_uid *reg_uid = buffer_reg_uid_find( | |
249 | ua_sess->tracing_id, ua_sess->bits_per_long, ua_sess->uid); | |
250 | if (!reg_uid) { | |
251 | goto error; | |
252 | } | |
253 | registry = reg_uid->registry->reg.ust; | |
254 | break; | |
255 | } | |
256 | default: | |
257 | assert(0); | |
258 | }; | |
259 | ||
260 | error: | |
261 | return registry; | |
262 | } | |
263 | ||
55cc08a6 DG |
264 | /* |
265 | * Delete ust context safely. RCU read lock must be held before calling | |
266 | * this function. | |
267 | */ | |
268 | static | |
fb45065e MD |
269 | void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx, |
270 | struct ust_app *app) | |
55cc08a6 | 271 | { |
ffe60014 DG |
272 | int ret; |
273 | ||
274 | assert(ua_ctx); | |
275 | ||
55cc08a6 | 276 | if (ua_ctx->obj) { |
fb45065e | 277 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 278 | ret = ustctl_release_object(sock, ua_ctx->obj); |
fb45065e | 279 | pthread_mutex_unlock(&app->sock_lock); |
d0b96690 DG |
280 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
281 | ERR("UST app sock %d release ctx obj handle %d failed with ret %d", | |
282 | sock, ua_ctx->obj->handle, ret); | |
ffe60014 | 283 | } |
55cc08a6 DG |
284 | free(ua_ctx->obj); |
285 | } | |
286 | free(ua_ctx); | |
287 | } | |
288 | ||
d80a6244 DG |
289 | /* |
290 | * Delete ust app event safely. RCU read lock must be held before calling | |
291 | * this function. | |
292 | */ | |
8b366481 | 293 | static |
fb45065e MD |
294 | void delete_ust_app_event(int sock, struct ust_app_event *ua_event, |
295 | struct ust_app *app) | |
d80a6244 | 296 | { |
ffe60014 DG |
297 | int ret; |
298 | ||
299 | assert(ua_event); | |
300 | ||
53a80697 | 301 | free(ua_event->filter); |
951f0b71 JI |
302 | if (ua_event->exclusion != NULL) |
303 | free(ua_event->exclusion); | |
edb67388 | 304 | if (ua_event->obj != NULL) { |
fb45065e | 305 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 306 | ret = ustctl_release_object(sock, ua_event->obj); |
fb45065e | 307 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
308 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
309 | ERR("UST app sock %d release event obj failed with ret %d", | |
310 | sock, ret); | |
311 | } | |
edb67388 DG |
312 | free(ua_event->obj); |
313 | } | |
d80a6244 DG |
314 | free(ua_event); |
315 | } | |
316 | ||
317 | /* | |
7972aab2 DG |
318 | * Release ust data object of the given stream. |
319 | * | |
320 | * Return 0 on success or else a negative value. | |
d80a6244 | 321 | */ |
fb45065e MD |
322 | static int release_ust_app_stream(int sock, struct ust_app_stream *stream, |
323 | struct ust_app *app) | |
d80a6244 | 324 | { |
7972aab2 | 325 | int ret = 0; |
ffe60014 DG |
326 | |
327 | assert(stream); | |
328 | ||
8b366481 | 329 | if (stream->obj) { |
fb45065e | 330 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 331 | ret = ustctl_release_object(sock, stream->obj); |
fb45065e | 332 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
333 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
334 | ERR("UST app sock %d release stream obj failed with ret %d", | |
335 | sock, ret); | |
336 | } | |
4063050c | 337 | lttng_fd_put(LTTNG_FD_APPS, 2); |
8b366481 DG |
338 | free(stream->obj); |
339 | } | |
7972aab2 DG |
340 | |
341 | return ret; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Delete ust app stream safely. RCU read lock must be held before calling | |
346 | * this function. | |
347 | */ | |
348 | static | |
fb45065e MD |
349 | void delete_ust_app_stream(int sock, struct ust_app_stream *stream, |
350 | struct ust_app *app) | |
7972aab2 DG |
351 | { |
352 | assert(stream); | |
353 | ||
fb45065e | 354 | (void) release_ust_app_stream(sock, stream, app); |
84cd17c6 | 355 | free(stream); |
d80a6244 DG |
356 | } |
357 | ||
36b588ed MD |
358 | /* |
359 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
360 | * section and outside of call_rcu thread, so we postpone its execution |
361 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
362 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
363 | */ |
364 | static | |
365 | void delete_ust_app_channel_rcu(struct rcu_head *head) | |
366 | { | |
367 | struct ust_app_channel *ua_chan = | |
368 | caa_container_of(head, struct ust_app_channel, rcu_head); | |
369 | ||
0b2dc8df MD |
370 | ht_cleanup_push(ua_chan->ctx); |
371 | ht_cleanup_push(ua_chan->events); | |
36b588ed MD |
372 | free(ua_chan); |
373 | } | |
374 | ||
fb83fe64 JD |
375 | /* |
376 | * Extract the lost packet or discarded events counter when the channel is | |
377 | * being deleted and store the value in the parent channel so we can | |
378 | * access it from lttng list and at stop/destroy. | |
82cac6d2 JG |
379 | * |
380 | * The session list lock must be held by the caller. | |
fb83fe64 JD |
381 | */ |
382 | static | |
383 | void save_per_pid_lost_discarded_counters(struct ust_app_channel *ua_chan) | |
384 | { | |
385 | uint64_t discarded = 0, lost = 0; | |
386 | struct ltt_session *session; | |
387 | struct ltt_ust_channel *uchan; | |
388 | ||
389 | if (ua_chan->attr.type != LTTNG_UST_CHAN_PER_CPU) { | |
390 | return; | |
391 | } | |
392 | ||
393 | rcu_read_lock(); | |
394 | session = session_find_by_id(ua_chan->session->tracing_id); | |
d68ec974 JG |
395 | if (!session || !session->ust_session) { |
396 | /* | |
397 | * Not finding the session is not an error because there are | |
398 | * multiple ways the channels can be torn down. | |
399 | * | |
400 | * 1) The session daemon can initiate the destruction of the | |
401 | * ust app session after receiving a destroy command or | |
402 | * during its shutdown/teardown. | |
403 | * 2) The application, since we are in per-pid tracing, is | |
404 | * unregistering and tearing down its ust app session. | |
405 | * | |
406 | * Both paths are protected by the session list lock which | |
407 | * ensures that the accounting of lost packets and discarded | |
408 | * events is done exactly once. The session is then unpublished | |
409 | * from the session list, resulting in this condition. | |
410 | */ | |
fb83fe64 JD |
411 | goto end; |
412 | } | |
413 | ||
414 | if (ua_chan->attr.overwrite) { | |
415 | consumer_get_lost_packets(ua_chan->session->tracing_id, | |
416 | ua_chan->key, session->ust_session->consumer, | |
417 | &lost); | |
418 | } else { | |
419 | consumer_get_discarded_events(ua_chan->session->tracing_id, | |
420 | ua_chan->key, session->ust_session->consumer, | |
421 | &discarded); | |
422 | } | |
423 | uchan = trace_ust_find_channel_by_name( | |
424 | session->ust_session->domain_global.channels, | |
425 | ua_chan->name); | |
426 | if (!uchan) { | |
427 | ERR("Missing UST channel to store discarded counters"); | |
428 | goto end; | |
429 | } | |
430 | ||
431 | uchan->per_pid_closed_app_discarded += discarded; | |
432 | uchan->per_pid_closed_app_lost += lost; | |
433 | ||
434 | end: | |
435 | rcu_read_unlock(); | |
436 | } | |
437 | ||
d80a6244 DG |
438 | /* |
439 | * Delete ust app channel safely. RCU read lock must be held before calling | |
440 | * this function. | |
82cac6d2 JG |
441 | * |
442 | * The session list lock must be held by the caller. | |
d80a6244 | 443 | */ |
8b366481 | 444 | static |
d0b96690 DG |
445 | void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan, |
446 | struct ust_app *app) | |
d80a6244 DG |
447 | { |
448 | int ret; | |
bec39940 | 449 | struct lttng_ht_iter iter; |
d80a6244 | 450 | struct ust_app_event *ua_event; |
55cc08a6 | 451 | struct ust_app_ctx *ua_ctx; |
030a66fa | 452 | struct ust_app_stream *stream, *stmp; |
7972aab2 | 453 | struct ust_registry_session *registry; |
d80a6244 | 454 | |
ffe60014 DG |
455 | assert(ua_chan); |
456 | ||
457 | DBG3("UST app deleting channel %s", ua_chan->name); | |
458 | ||
55cc08a6 | 459 | /* Wipe stream */ |
d80a6244 | 460 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
84cd17c6 | 461 | cds_list_del(&stream->list); |
fb45065e | 462 | delete_ust_app_stream(sock, stream, app); |
d80a6244 DG |
463 | } |
464 | ||
55cc08a6 | 465 | /* Wipe context */ |
bec39940 | 466 | cds_lfht_for_each_entry(ua_chan->ctx->ht, &iter.iter, ua_ctx, node.node) { |
31746f93 | 467 | cds_list_del(&ua_ctx->list); |
bec39940 | 468 | ret = lttng_ht_del(ua_chan->ctx, &iter); |
55cc08a6 | 469 | assert(!ret); |
fb45065e | 470 | delete_ust_app_ctx(sock, ua_ctx, app); |
55cc08a6 | 471 | } |
d80a6244 | 472 | |
55cc08a6 | 473 | /* Wipe events */ |
bec39940 DG |
474 | cds_lfht_for_each_entry(ua_chan->events->ht, &iter.iter, ua_event, |
475 | node.node) { | |
476 | ret = lttng_ht_del(ua_chan->events, &iter); | |
525b0740 | 477 | assert(!ret); |
fb45065e | 478 | delete_ust_app_event(sock, ua_event, app); |
d80a6244 | 479 | } |
edb67388 | 480 | |
c8335706 MD |
481 | if (ua_chan->session->buffer_type == LTTNG_BUFFER_PER_PID) { |
482 | /* Wipe and free registry from session registry. */ | |
483 | registry = get_session_registry(ua_chan->session); | |
484 | if (registry) { | |
485 | ust_registry_channel_del_free(registry, ua_chan->key); | |
486 | } | |
fb83fe64 | 487 | save_per_pid_lost_discarded_counters(ua_chan); |
7972aab2 | 488 | } |
d0b96690 | 489 | |
edb67388 | 490 | if (ua_chan->obj != NULL) { |
d0b96690 DG |
491 | /* Remove channel from application UST object descriptor. */ |
492 | iter.iter.node = &ua_chan->ust_objd_node.node; | |
c6e62271 DG |
493 | ret = lttng_ht_del(app->ust_objd, &iter); |
494 | assert(!ret); | |
fb45065e | 495 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 496 | ret = ustctl_release_object(sock, ua_chan->obj); |
fb45065e | 497 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
498 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
499 | ERR("UST app sock %d release channel obj failed with ret %d", | |
500 | sock, ret); | |
501 | } | |
7972aab2 | 502 | lttng_fd_put(LTTNG_FD_APPS, 1); |
edb67388 DG |
503 | free(ua_chan->obj); |
504 | } | |
36b588ed | 505 | call_rcu(&ua_chan->rcu_head, delete_ust_app_channel_rcu); |
d80a6244 DG |
506 | } |
507 | ||
fb45065e MD |
508 | int ust_app_register_done(struct ust_app *app) |
509 | { | |
510 | int ret; | |
511 | ||
512 | pthread_mutex_lock(&app->sock_lock); | |
513 | ret = ustctl_register_done(app->sock); | |
514 | pthread_mutex_unlock(&app->sock_lock); | |
515 | return ret; | |
516 | } | |
517 | ||
518 | int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data) | |
519 | { | |
520 | int ret, sock; | |
521 | ||
522 | if (app) { | |
523 | pthread_mutex_lock(&app->sock_lock); | |
524 | sock = app->sock; | |
525 | } else { | |
526 | sock = -1; | |
527 | } | |
528 | ret = ustctl_release_object(sock, data); | |
529 | if (app) { | |
530 | pthread_mutex_unlock(&app->sock_lock); | |
531 | } | |
532 | return ret; | |
533 | } | |
534 | ||
331744e3 | 535 | /* |
1b532a60 DG |
536 | * Push metadata to consumer socket. |
537 | * | |
dc2bbdae MD |
538 | * RCU read-side lock must be held to guarantee existance of socket. |
539 | * Must be called with the ust app session lock held. | |
540 | * Must be called with the registry lock held. | |
331744e3 JD |
541 | * |
542 | * On success, return the len of metadata pushed or else a negative value. | |
2c57e06d MD |
543 | * Returning a -EPIPE return value means we could not send the metadata, |
544 | * but it can be caused by recoverable errors (e.g. the application has | |
545 | * terminated concurrently). | |
331744e3 JD |
546 | */ |
547 | ssize_t ust_app_push_metadata(struct ust_registry_session *registry, | |
548 | struct consumer_socket *socket, int send_zero_data) | |
549 | { | |
550 | int ret; | |
551 | char *metadata_str = NULL; | |
c585821b | 552 | size_t len, offset, new_metadata_len_sent; |
331744e3 | 553 | ssize_t ret_val; |
93ec662e | 554 | uint64_t metadata_key, metadata_version; |
331744e3 JD |
555 | |
556 | assert(registry); | |
557 | assert(socket); | |
1b532a60 | 558 | |
c585821b MD |
559 | metadata_key = registry->metadata_key; |
560 | ||
ce34fcd0 | 561 | /* |
dc2bbdae MD |
562 | * Means that no metadata was assigned to the session. This can |
563 | * happens if no start has been done previously. | |
ce34fcd0 | 564 | */ |
c585821b | 565 | if (!metadata_key) { |
ce34fcd0 MD |
566 | return 0; |
567 | } | |
568 | ||
331744e3 JD |
569 | offset = registry->metadata_len_sent; |
570 | len = registry->metadata_len - registry->metadata_len_sent; | |
c585821b | 571 | new_metadata_len_sent = registry->metadata_len; |
93ec662e | 572 | metadata_version = registry->metadata_version; |
331744e3 JD |
573 | if (len == 0) { |
574 | DBG3("No metadata to push for metadata key %" PRIu64, | |
575 | registry->metadata_key); | |
576 | ret_val = len; | |
577 | if (send_zero_data) { | |
578 | DBG("No metadata to push"); | |
579 | goto push_data; | |
580 | } | |
581 | goto end; | |
582 | } | |
583 | ||
584 | /* Allocate only what we have to send. */ | |
585 | metadata_str = zmalloc(len); | |
586 | if (!metadata_str) { | |
587 | PERROR("zmalloc ust app metadata string"); | |
588 | ret_val = -ENOMEM; | |
589 | goto error; | |
590 | } | |
c585821b | 591 | /* Copy what we haven't sent out. */ |
331744e3 | 592 | memcpy(metadata_str, registry->metadata + offset, len); |
331744e3 JD |
593 | |
594 | push_data: | |
c585821b MD |
595 | pthread_mutex_unlock(®istry->lock); |
596 | /* | |
597 | * We need to unlock the registry while we push metadata to | |
598 | * break a circular dependency between the consumerd metadata | |
599 | * lock and the sessiond registry lock. Indeed, pushing metadata | |
600 | * to the consumerd awaits that it gets pushed all the way to | |
601 | * relayd, but doing so requires grabbing the metadata lock. If | |
602 | * a concurrent metadata request is being performed by | |
603 | * consumerd, this can try to grab the registry lock on the | |
604 | * sessiond while holding the metadata lock on the consumer | |
605 | * daemon. Those push and pull schemes are performed on two | |
606 | * different bidirectionnal communication sockets. | |
607 | */ | |
608 | ret = consumer_push_metadata(socket, metadata_key, | |
93ec662e | 609 | metadata_str, len, offset, metadata_version); |
c585821b | 610 | pthread_mutex_lock(®istry->lock); |
331744e3 | 611 | if (ret < 0) { |
000baf6a | 612 | /* |
dc2bbdae MD |
613 | * There is an acceptable race here between the registry |
614 | * metadata key assignment and the creation on the | |
615 | * consumer. The session daemon can concurrently push | |
616 | * metadata for this registry while being created on the | |
617 | * consumer since the metadata key of the registry is | |
618 | * assigned *before* it is setup to avoid the consumer | |
619 | * to ask for metadata that could possibly be not found | |
620 | * in the session daemon. | |
000baf6a | 621 | * |
dc2bbdae MD |
622 | * The metadata will get pushed either by the session |
623 | * being stopped or the consumer requesting metadata if | |
624 | * that race is triggered. | |
000baf6a DG |
625 | */ |
626 | if (ret == -LTTCOMM_CONSUMERD_CHANNEL_FAIL) { | |
627 | ret = 0; | |
c585821b MD |
628 | } else { |
629 | ERR("Error pushing metadata to consumer"); | |
000baf6a | 630 | } |
331744e3 JD |
631 | ret_val = ret; |
632 | goto error_push; | |
c585821b MD |
633 | } else { |
634 | /* | |
635 | * Metadata may have been concurrently pushed, since | |
636 | * we're not holding the registry lock while pushing to | |
637 | * consumer. This is handled by the fact that we send | |
638 | * the metadata content, size, and the offset at which | |
639 | * that metadata belongs. This may arrive out of order | |
640 | * on the consumer side, and the consumer is able to | |
641 | * deal with overlapping fragments. The consumer | |
642 | * supports overlapping fragments, which must be | |
643 | * contiguous starting from offset 0. We keep the | |
644 | * largest metadata_len_sent value of the concurrent | |
645 | * send. | |
646 | */ | |
647 | registry->metadata_len_sent = | |
648 | max_t(size_t, registry->metadata_len_sent, | |
649 | new_metadata_len_sent); | |
331744e3 | 650 | } |
331744e3 JD |
651 | free(metadata_str); |
652 | return len; | |
653 | ||
654 | end: | |
655 | error: | |
ce34fcd0 MD |
656 | if (ret_val) { |
657 | /* | |
dc2bbdae MD |
658 | * On error, flag the registry that the metadata is |
659 | * closed. We were unable to push anything and this | |
660 | * means that either the consumer is not responding or | |
661 | * the metadata cache has been destroyed on the | |
662 | * consumer. | |
ce34fcd0 MD |
663 | */ |
664 | registry->metadata_closed = 1; | |
665 | } | |
331744e3 JD |
666 | error_push: |
667 | free(metadata_str); | |
668 | return ret_val; | |
669 | } | |
670 | ||
d88aee68 | 671 | /* |
ce34fcd0 | 672 | * For a given application and session, push metadata to consumer. |
331744e3 JD |
673 | * Either sock or consumer is required : if sock is NULL, the default |
674 | * socket to send the metadata is retrieved from consumer, if sock | |
675 | * is not NULL we use it to send the metadata. | |
ce34fcd0 | 676 | * RCU read-side lock must be held while calling this function, |
dc2bbdae MD |
677 | * therefore ensuring existance of registry. It also ensures existance |
678 | * of socket throughout this function. | |
d88aee68 DG |
679 | * |
680 | * Return 0 on success else a negative error. | |
2c57e06d MD |
681 | * Returning a -EPIPE return value means we could not send the metadata, |
682 | * but it can be caused by recoverable errors (e.g. the application has | |
683 | * terminated concurrently). | |
d88aee68 | 684 | */ |
7972aab2 DG |
685 | static int push_metadata(struct ust_registry_session *registry, |
686 | struct consumer_output *consumer) | |
d88aee68 | 687 | { |
331744e3 JD |
688 | int ret_val; |
689 | ssize_t ret; | |
d88aee68 DG |
690 | struct consumer_socket *socket; |
691 | ||
7972aab2 DG |
692 | assert(registry); |
693 | assert(consumer); | |
694 | ||
ce34fcd0 | 695 | pthread_mutex_lock(®istry->lock); |
ce34fcd0 | 696 | if (registry->metadata_closed) { |
dc2bbdae MD |
697 | ret_val = -EPIPE; |
698 | goto error; | |
d88aee68 DG |
699 | } |
700 | ||
d88aee68 | 701 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
702 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
703 | consumer); | |
d88aee68 | 704 | if (!socket) { |
331744e3 | 705 | ret_val = -1; |
ce34fcd0 | 706 | goto error; |
d88aee68 DG |
707 | } |
708 | ||
331744e3 | 709 | ret = ust_app_push_metadata(registry, socket, 0); |
d88aee68 | 710 | if (ret < 0) { |
331744e3 | 711 | ret_val = ret; |
ce34fcd0 | 712 | goto error; |
d88aee68 | 713 | } |
dc2bbdae | 714 | pthread_mutex_unlock(®istry->lock); |
d88aee68 DG |
715 | return 0; |
716 | ||
ce34fcd0 | 717 | error: |
dc2bbdae | 718 | pthread_mutex_unlock(®istry->lock); |
331744e3 | 719 | return ret_val; |
d88aee68 DG |
720 | } |
721 | ||
722 | /* | |
723 | * Send to the consumer a close metadata command for the given session. Once | |
724 | * done, the metadata channel is deleted and the session metadata pointer is | |
dc2bbdae | 725 | * nullified. The session lock MUST be held unless the application is |
d88aee68 DG |
726 | * in the destroy path. |
727 | * | |
728 | * Return 0 on success else a negative value. | |
729 | */ | |
7972aab2 DG |
730 | static int close_metadata(struct ust_registry_session *registry, |
731 | struct consumer_output *consumer) | |
d88aee68 DG |
732 | { |
733 | int ret; | |
734 | struct consumer_socket *socket; | |
735 | ||
7972aab2 DG |
736 | assert(registry); |
737 | assert(consumer); | |
d88aee68 | 738 | |
7972aab2 DG |
739 | rcu_read_lock(); |
740 | ||
ce34fcd0 MD |
741 | pthread_mutex_lock(®istry->lock); |
742 | ||
7972aab2 | 743 | if (!registry->metadata_key || registry->metadata_closed) { |
d88aee68 | 744 | ret = 0; |
1b532a60 | 745 | goto end; |
d88aee68 DG |
746 | } |
747 | ||
d88aee68 | 748 | /* Get consumer socket to use to push the metadata.*/ |
7972aab2 DG |
749 | socket = consumer_find_socket_by_bitness(registry->bits_per_long, |
750 | consumer); | |
d88aee68 DG |
751 | if (!socket) { |
752 | ret = -1; | |
7972aab2 | 753 | goto error; |
d88aee68 DG |
754 | } |
755 | ||
7972aab2 | 756 | ret = consumer_close_metadata(socket, registry->metadata_key); |
d88aee68 | 757 | if (ret < 0) { |
7972aab2 | 758 | goto error; |
d88aee68 DG |
759 | } |
760 | ||
d88aee68 | 761 | error: |
1b532a60 DG |
762 | /* |
763 | * Metadata closed. Even on error this means that the consumer is not | |
764 | * responding or not found so either way a second close should NOT be emit | |
765 | * for this registry. | |
766 | */ | |
767 | registry->metadata_closed = 1; | |
768 | end: | |
ce34fcd0 | 769 | pthread_mutex_unlock(®istry->lock); |
7972aab2 | 770 | rcu_read_unlock(); |
d88aee68 DG |
771 | return ret; |
772 | } | |
773 | ||
36b588ed MD |
774 | /* |
775 | * We need to execute ht_destroy outside of RCU read-side critical | |
0b2dc8df MD |
776 | * section and outside of call_rcu thread, so we postpone its execution |
777 | * using ht_cleanup_push. It is simpler than to change the semantic of | |
778 | * the many callers of delete_ust_app_session(). | |
36b588ed MD |
779 | */ |
780 | static | |
781 | void delete_ust_app_session_rcu(struct rcu_head *head) | |
782 | { | |
783 | struct ust_app_session *ua_sess = | |
784 | caa_container_of(head, struct ust_app_session, rcu_head); | |
785 | ||
0b2dc8df | 786 | ht_cleanup_push(ua_sess->channels); |
36b588ed MD |
787 | free(ua_sess); |
788 | } | |
789 | ||
d80a6244 DG |
790 | /* |
791 | * Delete ust app session safely. RCU read lock must be held before calling | |
792 | * this function. | |
82cac6d2 JG |
793 | * |
794 | * The session list lock must be held by the caller. | |
d80a6244 | 795 | */ |
8b366481 | 796 | static |
d0b96690 DG |
797 | void delete_ust_app_session(int sock, struct ust_app_session *ua_sess, |
798 | struct ust_app *app) | |
d80a6244 DG |
799 | { |
800 | int ret; | |
bec39940 | 801 | struct lttng_ht_iter iter; |
d80a6244 | 802 | struct ust_app_channel *ua_chan; |
7972aab2 | 803 | struct ust_registry_session *registry; |
d80a6244 | 804 | |
d88aee68 DG |
805 | assert(ua_sess); |
806 | ||
1b532a60 DG |
807 | pthread_mutex_lock(&ua_sess->lock); |
808 | ||
b161602a MD |
809 | assert(!ua_sess->deleted); |
810 | ua_sess->deleted = true; | |
811 | ||
7972aab2 | 812 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 813 | if (registry) { |
d88aee68 | 814 | /* Push metadata for application before freeing the application. */ |
7972aab2 | 815 | (void) push_metadata(registry, ua_sess->consumer); |
d88aee68 | 816 | |
7972aab2 DG |
817 | /* |
818 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
819 | * metadata only on destroy trace session in this case. Also, the |
820 | * previous push metadata could have flag the metadata registry to | |
821 | * close so don't send a close command if closed. | |
7972aab2 | 822 | */ |
ce34fcd0 | 823 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
824 | /* And ask to close it for this session registry. */ |
825 | (void) close_metadata(registry, ua_sess->consumer); | |
826 | } | |
d80a6244 DG |
827 | } |
828 | ||
bec39940 DG |
829 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
830 | node.node) { | |
831 | ret = lttng_ht_del(ua_sess->channels, &iter); | |
525b0740 | 832 | assert(!ret); |
d0b96690 | 833 | delete_ust_app_channel(sock, ua_chan, app); |
d80a6244 | 834 | } |
d80a6244 | 835 | |
7972aab2 DG |
836 | /* In case of per PID, the registry is kept in the session. */ |
837 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { | |
838 | struct buffer_reg_pid *reg_pid = buffer_reg_pid_find(ua_sess->id); | |
839 | if (reg_pid) { | |
840 | buffer_reg_pid_remove(reg_pid); | |
841 | buffer_reg_pid_destroy(reg_pid); | |
842 | } | |
843 | } | |
d0b96690 | 844 | |
aee6bafd | 845 | if (ua_sess->handle != -1) { |
fb45065e | 846 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 847 | ret = ustctl_release_handle(sock, ua_sess->handle); |
fb45065e | 848 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
849 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
850 | ERR("UST app sock %d release session handle failed with ret %d", | |
851 | sock, ret); | |
852 | } | |
10b56aef MD |
853 | /* Remove session from application UST object descriptor. */ |
854 | iter.iter.node = &ua_sess->ust_objd_node.node; | |
855 | ret = lttng_ht_del(app->ust_sessions_objd, &iter); | |
856 | assert(!ret); | |
aee6bafd | 857 | } |
10b56aef | 858 | |
1b532a60 DG |
859 | pthread_mutex_unlock(&ua_sess->lock); |
860 | ||
6addfa37 MD |
861 | consumer_output_put(ua_sess->consumer); |
862 | ||
36b588ed | 863 | call_rcu(&ua_sess->rcu_head, delete_ust_app_session_rcu); |
d80a6244 | 864 | } |
91d76f53 DG |
865 | |
866 | /* | |
284d8f55 DG |
867 | * Delete a traceable application structure from the global list. Never call |
868 | * this function outside of a call_rcu call. | |
36b588ed MD |
869 | * |
870 | * RCU read side lock should _NOT_ be held when calling this function. | |
91d76f53 | 871 | */ |
8b366481 DG |
872 | static |
873 | void delete_ust_app(struct ust_app *app) | |
91d76f53 | 874 | { |
8b366481 | 875 | int ret, sock; |
d42f20df | 876 | struct ust_app_session *ua_sess, *tmp_ua_sess; |
44d3bd01 | 877 | |
82cac6d2 JG |
878 | /* |
879 | * The session list lock must be held during this function to guarantee | |
880 | * the existence of ua_sess. | |
881 | */ | |
882 | session_lock_list(); | |
d80a6244 | 883 | /* Delete ust app sessions info */ |
852d0037 DG |
884 | sock = app->sock; |
885 | app->sock = -1; | |
d80a6244 | 886 | |
8b366481 | 887 | /* Wipe sessions */ |
d42f20df DG |
888 | cds_list_for_each_entry_safe(ua_sess, tmp_ua_sess, &app->teardown_head, |
889 | teardown_node) { | |
890 | /* Free every object in the session and the session. */ | |
36b588ed | 891 | rcu_read_lock(); |
d0b96690 | 892 | delete_ust_app_session(sock, ua_sess, app); |
36b588ed | 893 | rcu_read_unlock(); |
d80a6244 | 894 | } |
36b588ed | 895 | |
0b2dc8df | 896 | ht_cleanup_push(app->sessions); |
10b56aef | 897 | ht_cleanup_push(app->ust_sessions_objd); |
0b2dc8df | 898 | ht_cleanup_push(app->ust_objd); |
d80a6244 | 899 | |
6414a713 | 900 | /* |
852d0037 DG |
901 | * Wait until we have deleted the application from the sock hash table |
902 | * before closing this socket, otherwise an application could re-use the | |
903 | * socket ID and race with the teardown, using the same hash table entry. | |
904 | * | |
905 | * It's OK to leave the close in call_rcu. We want it to stay unique for | |
906 | * all RCU readers that could run concurrently with unregister app, | |
907 | * therefore we _need_ to only close that socket after a grace period. So | |
908 | * it should stay in this RCU callback. | |
909 | * | |
910 | * This close() is a very important step of the synchronization model so | |
911 | * every modification to this function must be carefully reviewed. | |
6414a713 | 912 | */ |
799e2c4f MD |
913 | ret = close(sock); |
914 | if (ret) { | |
915 | PERROR("close"); | |
916 | } | |
4063050c | 917 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d80a6244 | 918 | |
852d0037 | 919 | DBG2("UST app pid %d deleted", app->pid); |
284d8f55 | 920 | free(app); |
82cac6d2 | 921 | session_unlock_list(); |
099e26bd DG |
922 | } |
923 | ||
924 | /* | |
f6a9efaa | 925 | * URCU intermediate call to delete an UST app. |
099e26bd | 926 | */ |
8b366481 DG |
927 | static |
928 | void delete_ust_app_rcu(struct rcu_head *head) | |
099e26bd | 929 | { |
bec39940 DG |
930 | struct lttng_ht_node_ulong *node = |
931 | caa_container_of(head, struct lttng_ht_node_ulong, head); | |
f6a9efaa | 932 | struct ust_app *app = |
852d0037 | 933 | caa_container_of(node, struct ust_app, pid_n); |
f6a9efaa | 934 | |
852d0037 | 935 | DBG3("Call RCU deleting app PID %d", app->pid); |
f6a9efaa | 936 | delete_ust_app(app); |
099e26bd DG |
937 | } |
938 | ||
ffe60014 DG |
939 | /* |
940 | * Delete the session from the application ht and delete the data structure by | |
941 | * freeing every object inside and releasing them. | |
82cac6d2 JG |
942 | * |
943 | * The session list lock must be held by the caller. | |
ffe60014 | 944 | */ |
d0b96690 | 945 | static void destroy_app_session(struct ust_app *app, |
ffe60014 DG |
946 | struct ust_app_session *ua_sess) |
947 | { | |
948 | int ret; | |
949 | struct lttng_ht_iter iter; | |
950 | ||
951 | assert(app); | |
952 | assert(ua_sess); | |
953 | ||
954 | iter.iter.node = &ua_sess->node.node; | |
955 | ret = lttng_ht_del(app->sessions, &iter); | |
956 | if (ret) { | |
957 | /* Already scheduled for teardown. */ | |
958 | goto end; | |
959 | } | |
960 | ||
961 | /* Once deleted, free the data structure. */ | |
d0b96690 | 962 | delete_ust_app_session(app->sock, ua_sess, app); |
ffe60014 DG |
963 | |
964 | end: | |
965 | return; | |
966 | } | |
967 | ||
8b366481 DG |
968 | /* |
969 | * Alloc new UST app session. | |
970 | */ | |
971 | static | |
d0b96690 | 972 | struct ust_app_session *alloc_ust_app_session(struct ust_app *app) |
8b366481 DG |
973 | { |
974 | struct ust_app_session *ua_sess; | |
975 | ||
976 | /* Init most of the default value by allocating and zeroing */ | |
977 | ua_sess = zmalloc(sizeof(struct ust_app_session)); | |
978 | if (ua_sess == NULL) { | |
979 | PERROR("malloc"); | |
ffe60014 | 980 | goto error_free; |
8b366481 DG |
981 | } |
982 | ||
983 | ua_sess->handle = -1; | |
bec39940 | 984 | ua_sess->channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
ad7a9107 | 985 | ua_sess->metadata_attr.type = LTTNG_UST_CHAN_METADATA; |
84ad93e8 | 986 | pthread_mutex_init(&ua_sess->lock, NULL); |
ad7a9107 | 987 | |
8b366481 DG |
988 | return ua_sess; |
989 | ||
ffe60014 | 990 | error_free: |
8b366481 DG |
991 | return NULL; |
992 | } | |
993 | ||
994 | /* | |
995 | * Alloc new UST app channel. | |
996 | */ | |
997 | static | |
998 | struct ust_app_channel *alloc_ust_app_channel(char *name, | |
d0b96690 | 999 | struct ust_app_session *ua_sess, |
ffe60014 | 1000 | struct lttng_ust_channel_attr *attr) |
8b366481 DG |
1001 | { |
1002 | struct ust_app_channel *ua_chan; | |
1003 | ||
1004 | /* Init most of the default value by allocating and zeroing */ | |
1005 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); | |
1006 | if (ua_chan == NULL) { | |
1007 | PERROR("malloc"); | |
1008 | goto error; | |
1009 | } | |
1010 | ||
1011 | /* Setup channel name */ | |
1012 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); | |
1013 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
1014 | ||
1015 | ua_chan->enabled = 1; | |
1016 | ua_chan->handle = -1; | |
45893984 | 1017 | ua_chan->session = ua_sess; |
ffe60014 | 1018 | ua_chan->key = get_next_channel_key(); |
bec39940 DG |
1019 | ua_chan->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
1020 | ua_chan->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); | |
1021 | lttng_ht_node_init_str(&ua_chan->node, ua_chan->name); | |
8b366481 DG |
1022 | |
1023 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); | |
31746f93 | 1024 | CDS_INIT_LIST_HEAD(&ua_chan->ctx_list); |
8b366481 DG |
1025 | |
1026 | /* Copy attributes */ | |
1027 | if (attr) { | |
ffe60014 | 1028 | /* Translate from lttng_ust_channel to ustctl_consumer_channel_attr. */ |
2fe6e7f5 DG |
1029 | ua_chan->attr.subbuf_size = attr->subbuf_size; |
1030 | ua_chan->attr.num_subbuf = attr->num_subbuf; | |
1031 | ua_chan->attr.overwrite = attr->overwrite; | |
1032 | ua_chan->attr.switch_timer_interval = attr->switch_timer_interval; | |
1033 | ua_chan->attr.read_timer_interval = attr->read_timer_interval; | |
1034 | ua_chan->attr.output = attr->output; | |
8b366481 | 1035 | } |
ffe60014 DG |
1036 | /* By default, the channel is a per cpu channel. */ |
1037 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
8b366481 DG |
1038 | |
1039 | DBG3("UST app channel %s allocated", ua_chan->name); | |
1040 | ||
1041 | return ua_chan; | |
1042 | ||
1043 | error: | |
1044 | return NULL; | |
1045 | } | |
1046 | ||
37f1c236 DG |
1047 | /* |
1048 | * Allocate and initialize a UST app stream. | |
1049 | * | |
1050 | * Return newly allocated stream pointer or NULL on error. | |
1051 | */ | |
ffe60014 | 1052 | struct ust_app_stream *ust_app_alloc_stream(void) |
37f1c236 DG |
1053 | { |
1054 | struct ust_app_stream *stream = NULL; | |
1055 | ||
1056 | stream = zmalloc(sizeof(*stream)); | |
1057 | if (stream == NULL) { | |
1058 | PERROR("zmalloc ust app stream"); | |
1059 | goto error; | |
1060 | } | |
1061 | ||
1062 | /* Zero could be a valid value for a handle so flag it to -1. */ | |
1063 | stream->handle = -1; | |
1064 | ||
1065 | error: | |
1066 | return stream; | |
1067 | } | |
1068 | ||
8b366481 DG |
1069 | /* |
1070 | * Alloc new UST app event. | |
1071 | */ | |
1072 | static | |
1073 | struct ust_app_event *alloc_ust_app_event(char *name, | |
1074 | struct lttng_ust_event *attr) | |
1075 | { | |
1076 | struct ust_app_event *ua_event; | |
1077 | ||
1078 | /* Init most of the default value by allocating and zeroing */ | |
1079 | ua_event = zmalloc(sizeof(struct ust_app_event)); | |
1080 | if (ua_event == NULL) { | |
1081 | PERROR("malloc"); | |
1082 | goto error; | |
1083 | } | |
1084 | ||
1085 | ua_event->enabled = 1; | |
1086 | strncpy(ua_event->name, name, sizeof(ua_event->name)); | |
1087 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
bec39940 | 1088 | lttng_ht_node_init_str(&ua_event->node, ua_event->name); |
8b366481 DG |
1089 | |
1090 | /* Copy attributes */ | |
1091 | if (attr) { | |
1092 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); | |
1093 | } | |
1094 | ||
1095 | DBG3("UST app event %s allocated", ua_event->name); | |
1096 | ||
1097 | return ua_event; | |
1098 | ||
1099 | error: | |
1100 | return NULL; | |
1101 | } | |
1102 | ||
1103 | /* | |
1104 | * Alloc new UST app context. | |
1105 | */ | |
1106 | static | |
bdf64013 | 1107 | struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context_attr *uctx) |
8b366481 DG |
1108 | { |
1109 | struct ust_app_ctx *ua_ctx; | |
1110 | ||
1111 | ua_ctx = zmalloc(sizeof(struct ust_app_ctx)); | |
1112 | if (ua_ctx == NULL) { | |
1113 | goto error; | |
1114 | } | |
1115 | ||
31746f93 DG |
1116 | CDS_INIT_LIST_HEAD(&ua_ctx->list); |
1117 | ||
8b366481 DG |
1118 | if (uctx) { |
1119 | memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx)); | |
bdf64013 JG |
1120 | if (uctx->ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
1121 | char *provider_name = NULL, *ctx_name = NULL; | |
1122 | ||
1123 | provider_name = strdup(uctx->u.app_ctx.provider_name); | |
1124 | ctx_name = strdup(uctx->u.app_ctx.ctx_name); | |
1125 | if (!provider_name || !ctx_name) { | |
1126 | free(provider_name); | |
1127 | free(ctx_name); | |
1128 | goto error; | |
1129 | } | |
1130 | ||
1131 | ua_ctx->ctx.u.app_ctx.provider_name = provider_name; | |
1132 | ua_ctx->ctx.u.app_ctx.ctx_name = ctx_name; | |
1133 | } | |
8b366481 DG |
1134 | } |
1135 | ||
1136 | DBG3("UST app context %d allocated", ua_ctx->ctx.ctx); | |
8b366481 | 1137 | return ua_ctx; |
bdf64013 JG |
1138 | error: |
1139 | free(ua_ctx); | |
1140 | return NULL; | |
8b366481 DG |
1141 | } |
1142 | ||
025faf73 DG |
1143 | /* |
1144 | * Allocate a filter and copy the given original filter. | |
1145 | * | |
1146 | * Return allocated filter or NULL on error. | |
1147 | */ | |
51755dc8 JG |
1148 | static struct lttng_filter_bytecode *copy_filter_bytecode( |
1149 | struct lttng_filter_bytecode *orig_f) | |
025faf73 | 1150 | { |
51755dc8 | 1151 | struct lttng_filter_bytecode *filter = NULL; |
025faf73 DG |
1152 | |
1153 | /* Copy filter bytecode */ | |
1154 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1155 | if (!filter) { | |
51755dc8 | 1156 | PERROR("zmalloc alloc filter bytecode"); |
025faf73 DG |
1157 | goto error; |
1158 | } | |
1159 | ||
1160 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1161 | ||
1162 | error: | |
1163 | return filter; | |
1164 | } | |
1165 | ||
51755dc8 JG |
1166 | /* |
1167 | * Create a liblttng-ust filter bytecode from given bytecode. | |
1168 | * | |
1169 | * Return allocated filter or NULL on error. | |
1170 | */ | |
1171 | static struct lttng_ust_filter_bytecode *create_ust_bytecode_from_bytecode( | |
1172 | struct lttng_filter_bytecode *orig_f) | |
1173 | { | |
1174 | struct lttng_ust_filter_bytecode *filter = NULL; | |
1175 | ||
1176 | /* Copy filter bytecode */ | |
1177 | filter = zmalloc(sizeof(*filter) + orig_f->len); | |
1178 | if (!filter) { | |
1179 | PERROR("zmalloc alloc ust filter bytecode"); | |
1180 | goto error; | |
1181 | } | |
1182 | ||
1183 | assert(sizeof(struct lttng_filter_bytecode) == | |
1184 | sizeof(struct lttng_ust_filter_bytecode)); | |
1185 | memcpy(filter, orig_f, sizeof(*filter) + orig_f->len); | |
1186 | error: | |
1187 | return filter; | |
1188 | } | |
1189 | ||
099e26bd | 1190 | /* |
421cb601 DG |
1191 | * Find an ust_app using the sock and return it. RCU read side lock must be |
1192 | * held before calling this helper function. | |
099e26bd | 1193 | */ |
f20baf8e | 1194 | struct ust_app *ust_app_find_by_sock(int sock) |
099e26bd | 1195 | { |
bec39940 | 1196 | struct lttng_ht_node_ulong *node; |
bec39940 | 1197 | struct lttng_ht_iter iter; |
f6a9efaa | 1198 | |
852d0037 | 1199 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &iter); |
bec39940 | 1200 | node = lttng_ht_iter_get_node_ulong(&iter); |
f6a9efaa DG |
1201 | if (node == NULL) { |
1202 | DBG2("UST app find by sock %d not found", sock); | |
f6a9efaa DG |
1203 | goto error; |
1204 | } | |
852d0037 DG |
1205 | |
1206 | return caa_container_of(node, struct ust_app, sock_n); | |
f6a9efaa DG |
1207 | |
1208 | error: | |
1209 | return NULL; | |
099e26bd DG |
1210 | } |
1211 | ||
d0b96690 DG |
1212 | /* |
1213 | * Find an ust_app using the notify sock and return it. RCU read side lock must | |
1214 | * be held before calling this helper function. | |
1215 | */ | |
1216 | static struct ust_app *find_app_by_notify_sock(int sock) | |
1217 | { | |
1218 | struct lttng_ht_node_ulong *node; | |
1219 | struct lttng_ht_iter iter; | |
1220 | ||
1221 | lttng_ht_lookup(ust_app_ht_by_notify_sock, (void *)((unsigned long) sock), | |
1222 | &iter); | |
1223 | node = lttng_ht_iter_get_node_ulong(&iter); | |
1224 | if (node == NULL) { | |
1225 | DBG2("UST app find by notify sock %d not found", sock); | |
1226 | goto error; | |
1227 | } | |
1228 | ||
1229 | return caa_container_of(node, struct ust_app, notify_sock_n); | |
1230 | ||
1231 | error: | |
1232 | return NULL; | |
1233 | } | |
1234 | ||
025faf73 DG |
1235 | /* |
1236 | * Lookup for an ust app event based on event name, filter bytecode and the | |
1237 | * event loglevel. | |
1238 | * | |
1239 | * Return an ust_app_event object or NULL on error. | |
1240 | */ | |
18eace3b | 1241 | static struct ust_app_event *find_ust_app_event(struct lttng_ht *ht, |
2106efa0 PP |
1242 | char *name, struct lttng_filter_bytecode *filter, |
1243 | int loglevel_value, | |
39c5a3a7 | 1244 | const struct lttng_event_exclusion *exclusion) |
18eace3b DG |
1245 | { |
1246 | struct lttng_ht_iter iter; | |
1247 | struct lttng_ht_node_str *node; | |
1248 | struct ust_app_event *event = NULL; | |
1249 | struct ust_app_ht_key key; | |
18eace3b DG |
1250 | |
1251 | assert(name); | |
1252 | assert(ht); | |
1253 | ||
1254 | /* Setup key for event lookup. */ | |
1255 | key.name = name; | |
1256 | key.filter = filter; | |
2106efa0 | 1257 | key.loglevel_type = loglevel_value; |
39c5a3a7 | 1258 | /* lttng_event_exclusion and lttng_ust_event_exclusion structures are similar */ |
51755dc8 | 1259 | key.exclusion = exclusion; |
18eace3b | 1260 | |
025faf73 DG |
1261 | /* Lookup using the event name as hash and a custom match fct. */ |
1262 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), | |
1263 | ht_match_ust_app_event, &key, &iter.iter); | |
18eace3b DG |
1264 | node = lttng_ht_iter_get_node_str(&iter); |
1265 | if (node == NULL) { | |
1266 | goto end; | |
1267 | } | |
1268 | ||
1269 | event = caa_container_of(node, struct ust_app_event, node); | |
1270 | ||
1271 | end: | |
18eace3b DG |
1272 | return event; |
1273 | } | |
1274 | ||
55cc08a6 DG |
1275 | /* |
1276 | * Create the channel context on the tracer. | |
d0b96690 DG |
1277 | * |
1278 | * Called with UST app session lock held. | |
55cc08a6 DG |
1279 | */ |
1280 | static | |
1281 | int create_ust_channel_context(struct ust_app_channel *ua_chan, | |
1282 | struct ust_app_ctx *ua_ctx, struct ust_app *app) | |
1283 | { | |
1284 | int ret; | |
1285 | ||
840cb59c | 1286 | health_code_update(); |
86acf0da | 1287 | |
fb45065e | 1288 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1289 | ret = ustctl_add_context(app->sock, &ua_ctx->ctx, |
55cc08a6 | 1290 | ua_chan->obj, &ua_ctx->obj); |
fb45065e | 1291 | pthread_mutex_unlock(&app->sock_lock); |
55cc08a6 | 1292 | if (ret < 0) { |
ffe60014 DG |
1293 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1294 | ERR("UST app create channel context failed for app (pid: %d) " | |
1295 | "with ret %d", app->pid, ret); | |
1296 | } else { | |
3757b385 DG |
1297 | /* |
1298 | * This is normal behavior, an application can die during the | |
1299 | * creation process. Don't report an error so the execution can | |
1300 | * continue normally. | |
1301 | */ | |
1302 | ret = 0; | |
ffe60014 DG |
1303 | DBG3("UST app disable event failed. Application is dead."); |
1304 | } | |
55cc08a6 DG |
1305 | goto error; |
1306 | } | |
1307 | ||
1308 | ua_ctx->handle = ua_ctx->obj->handle; | |
1309 | ||
d0b96690 DG |
1310 | DBG2("UST app context handle %d created successfully for channel %s", |
1311 | ua_ctx->handle, ua_chan->name); | |
55cc08a6 DG |
1312 | |
1313 | error: | |
840cb59c | 1314 | health_code_update(); |
55cc08a6 DG |
1315 | return ret; |
1316 | } | |
1317 | ||
53a80697 MD |
1318 | /* |
1319 | * Set the filter on the tracer. | |
1320 | */ | |
1321 | static | |
1322 | int set_ust_event_filter(struct ust_app_event *ua_event, | |
1323 | struct ust_app *app) | |
1324 | { | |
1325 | int ret; | |
51755dc8 | 1326 | struct lttng_ust_filter_bytecode *ust_bytecode = NULL; |
53a80697 | 1327 | |
840cb59c | 1328 | health_code_update(); |
86acf0da | 1329 | |
53a80697 | 1330 | if (!ua_event->filter) { |
86acf0da DG |
1331 | ret = 0; |
1332 | goto error; | |
53a80697 MD |
1333 | } |
1334 | ||
51755dc8 JG |
1335 | ust_bytecode = create_ust_bytecode_from_bytecode(ua_event->filter); |
1336 | if (!ust_bytecode) { | |
1337 | ret = -LTTNG_ERR_NOMEM; | |
1338 | goto error; | |
1339 | } | |
fb45065e | 1340 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1341 | ret = ustctl_set_filter(app->sock, ust_bytecode, |
53a80697 | 1342 | ua_event->obj); |
fb45065e | 1343 | pthread_mutex_unlock(&app->sock_lock); |
53a80697 | 1344 | if (ret < 0) { |
ffe60014 DG |
1345 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1346 | ERR("UST app event %s filter failed for app (pid: %d) " | |
1347 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1348 | } else { | |
3757b385 DG |
1349 | /* |
1350 | * This is normal behavior, an application can die during the | |
1351 | * creation process. Don't report an error so the execution can | |
1352 | * continue normally. | |
1353 | */ | |
1354 | ret = 0; | |
ffe60014 DG |
1355 | DBG3("UST app filter event failed. Application is dead."); |
1356 | } | |
53a80697 MD |
1357 | goto error; |
1358 | } | |
1359 | ||
1360 | DBG2("UST filter set successfully for event %s", ua_event->name); | |
1361 | ||
1362 | error: | |
840cb59c | 1363 | health_code_update(); |
51755dc8 | 1364 | free(ust_bytecode); |
53a80697 MD |
1365 | return ret; |
1366 | } | |
1367 | ||
51755dc8 JG |
1368 | static |
1369 | struct lttng_ust_event_exclusion *create_ust_exclusion_from_exclusion( | |
1370 | struct lttng_event_exclusion *exclusion) | |
1371 | { | |
1372 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; | |
1373 | size_t exclusion_alloc_size = sizeof(struct lttng_ust_event_exclusion) + | |
1374 | LTTNG_UST_SYM_NAME_LEN * exclusion->count; | |
1375 | ||
1376 | ust_exclusion = zmalloc(exclusion_alloc_size); | |
1377 | if (!ust_exclusion) { | |
1378 | PERROR("malloc"); | |
1379 | goto end; | |
1380 | } | |
1381 | ||
1382 | assert(sizeof(struct lttng_event_exclusion) == | |
1383 | sizeof(struct lttng_ust_event_exclusion)); | |
1384 | memcpy(ust_exclusion, exclusion, exclusion_alloc_size); | |
1385 | end: | |
1386 | return ust_exclusion; | |
1387 | } | |
1388 | ||
7cc9a73c JI |
1389 | /* |
1390 | * Set event exclusions on the tracer. | |
1391 | */ | |
1392 | static | |
1393 | int set_ust_event_exclusion(struct ust_app_event *ua_event, | |
1394 | struct ust_app *app) | |
1395 | { | |
1396 | int ret; | |
51755dc8 | 1397 | struct lttng_ust_event_exclusion *ust_exclusion = NULL; |
7cc9a73c JI |
1398 | |
1399 | health_code_update(); | |
1400 | ||
1401 | if (!ua_event->exclusion || !ua_event->exclusion->count) { | |
1402 | ret = 0; | |
1403 | goto error; | |
1404 | } | |
1405 | ||
51755dc8 JG |
1406 | ust_exclusion = create_ust_exclusion_from_exclusion( |
1407 | ua_event->exclusion); | |
1408 | if (!ust_exclusion) { | |
1409 | ret = -LTTNG_ERR_NOMEM; | |
1410 | goto error; | |
1411 | } | |
fb45065e | 1412 | pthread_mutex_lock(&app->sock_lock); |
51755dc8 | 1413 | ret = ustctl_set_exclusion(app->sock, ust_exclusion, ua_event->obj); |
fb45065e | 1414 | pthread_mutex_unlock(&app->sock_lock); |
7cc9a73c JI |
1415 | if (ret < 0) { |
1416 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
1417 | ERR("UST app event %s exclusions failed for app (pid: %d) " | |
1418 | "with ret %d", ua_event->attr.name, app->pid, ret); | |
1419 | } else { | |
1420 | /* | |
1421 | * This is normal behavior, an application can die during the | |
1422 | * creation process. Don't report an error so the execution can | |
1423 | * continue normally. | |
1424 | */ | |
1425 | ret = 0; | |
1426 | DBG3("UST app event exclusion failed. Application is dead."); | |
1427 | } | |
1428 | goto error; | |
1429 | } | |
1430 | ||
1431 | DBG2("UST exclusion set successfully for event %s", ua_event->name); | |
1432 | ||
1433 | error: | |
1434 | health_code_update(); | |
51755dc8 | 1435 | free(ust_exclusion); |
7cc9a73c JI |
1436 | return ret; |
1437 | } | |
1438 | ||
9730260e DG |
1439 | /* |
1440 | * Disable the specified event on to UST tracer for the UST session. | |
1441 | */ | |
1442 | static int disable_ust_event(struct ust_app *app, | |
1443 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1444 | { | |
1445 | int ret; | |
1446 | ||
840cb59c | 1447 | health_code_update(); |
86acf0da | 1448 | |
fb45065e | 1449 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1450 | ret = ustctl_disable(app->sock, ua_event->obj); |
fb45065e | 1451 | pthread_mutex_unlock(&app->sock_lock); |
9730260e | 1452 | if (ret < 0) { |
ffe60014 DG |
1453 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1454 | ERR("UST app event %s disable failed for app (pid: %d) " | |
1455 | "and session handle %d with ret %d", | |
1456 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1457 | } else { | |
3757b385 DG |
1458 | /* |
1459 | * This is normal behavior, an application can die during the | |
1460 | * creation process. Don't report an error so the execution can | |
1461 | * continue normally. | |
1462 | */ | |
1463 | ret = 0; | |
ffe60014 DG |
1464 | DBG3("UST app disable event failed. Application is dead."); |
1465 | } | |
9730260e DG |
1466 | goto error; |
1467 | } | |
1468 | ||
1469 | DBG2("UST app event %s disabled successfully for app (pid: %d)", | |
852d0037 | 1470 | ua_event->attr.name, app->pid); |
9730260e DG |
1471 | |
1472 | error: | |
840cb59c | 1473 | health_code_update(); |
9730260e DG |
1474 | return ret; |
1475 | } | |
1476 | ||
78f0bacd DG |
1477 | /* |
1478 | * Disable the specified channel on to UST tracer for the UST session. | |
1479 | */ | |
1480 | static int disable_ust_channel(struct ust_app *app, | |
1481 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1482 | { | |
1483 | int ret; | |
1484 | ||
840cb59c | 1485 | health_code_update(); |
86acf0da | 1486 | |
fb45065e | 1487 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1488 | ret = ustctl_disable(app->sock, ua_chan->obj); |
fb45065e | 1489 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1490 | if (ret < 0) { |
ffe60014 DG |
1491 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1492 | ERR("UST app channel %s disable failed for app (pid: %d) " | |
1493 | "and session handle %d with ret %d", | |
1494 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1495 | } else { | |
3757b385 DG |
1496 | /* |
1497 | * This is normal behavior, an application can die during the | |
1498 | * creation process. Don't report an error so the execution can | |
1499 | * continue normally. | |
1500 | */ | |
1501 | ret = 0; | |
ffe60014 DG |
1502 | DBG3("UST app disable channel failed. Application is dead."); |
1503 | } | |
78f0bacd DG |
1504 | goto error; |
1505 | } | |
1506 | ||
78f0bacd | 1507 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
852d0037 | 1508 | ua_chan->name, app->pid); |
78f0bacd DG |
1509 | |
1510 | error: | |
840cb59c | 1511 | health_code_update(); |
78f0bacd DG |
1512 | return ret; |
1513 | } | |
1514 | ||
1515 | /* | |
1516 | * Enable the specified channel on to UST tracer for the UST session. | |
1517 | */ | |
1518 | static int enable_ust_channel(struct ust_app *app, | |
1519 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
1520 | { | |
1521 | int ret; | |
1522 | ||
840cb59c | 1523 | health_code_update(); |
86acf0da | 1524 | |
fb45065e | 1525 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1526 | ret = ustctl_enable(app->sock, ua_chan->obj); |
fb45065e | 1527 | pthread_mutex_unlock(&app->sock_lock); |
78f0bacd | 1528 | if (ret < 0) { |
ffe60014 DG |
1529 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1530 | ERR("UST app channel %s enable failed for app (pid: %d) " | |
1531 | "and session handle %d with ret %d", | |
1532 | ua_chan->name, app->pid, ua_sess->handle, ret); | |
1533 | } else { | |
3757b385 DG |
1534 | /* |
1535 | * This is normal behavior, an application can die during the | |
1536 | * creation process. Don't report an error so the execution can | |
1537 | * continue normally. | |
1538 | */ | |
1539 | ret = 0; | |
ffe60014 DG |
1540 | DBG3("UST app enable channel failed. Application is dead."); |
1541 | } | |
78f0bacd DG |
1542 | goto error; |
1543 | } | |
1544 | ||
1545 | ua_chan->enabled = 1; | |
1546 | ||
1547 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", | |
852d0037 | 1548 | ua_chan->name, app->pid); |
78f0bacd DG |
1549 | |
1550 | error: | |
840cb59c | 1551 | health_code_update(); |
78f0bacd DG |
1552 | return ret; |
1553 | } | |
1554 | ||
edb67388 DG |
1555 | /* |
1556 | * Enable the specified event on to UST tracer for the UST session. | |
1557 | */ | |
1558 | static int enable_ust_event(struct ust_app *app, | |
1559 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) | |
1560 | { | |
1561 | int ret; | |
1562 | ||
840cb59c | 1563 | health_code_update(); |
86acf0da | 1564 | |
fb45065e | 1565 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1566 | ret = ustctl_enable(app->sock, ua_event->obj); |
fb45065e | 1567 | pthread_mutex_unlock(&app->sock_lock); |
edb67388 | 1568 | if (ret < 0) { |
ffe60014 DG |
1569 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1570 | ERR("UST app event %s enable failed for app (pid: %d) " | |
1571 | "and session handle %d with ret %d", | |
1572 | ua_event->attr.name, app->pid, ua_sess->handle, ret); | |
1573 | } else { | |
3757b385 DG |
1574 | /* |
1575 | * This is normal behavior, an application can die during the | |
1576 | * creation process. Don't report an error so the execution can | |
1577 | * continue normally. | |
1578 | */ | |
1579 | ret = 0; | |
ffe60014 DG |
1580 | DBG3("UST app enable event failed. Application is dead."); |
1581 | } | |
edb67388 DG |
1582 | goto error; |
1583 | } | |
1584 | ||
1585 | DBG2("UST app event %s enabled successfully for app (pid: %d)", | |
852d0037 | 1586 | ua_event->attr.name, app->pid); |
edb67388 DG |
1587 | |
1588 | error: | |
840cb59c | 1589 | health_code_update(); |
edb67388 DG |
1590 | return ret; |
1591 | } | |
1592 | ||
099e26bd | 1593 | /* |
7972aab2 | 1594 | * Send channel and stream buffer to application. |
4f3ab6ee | 1595 | * |
ffe60014 | 1596 | * Return 0 on success. On error, a negative value is returned. |
4f3ab6ee | 1597 | */ |
7972aab2 DG |
1598 | static int send_channel_pid_to_ust(struct ust_app *app, |
1599 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) | |
4f3ab6ee DG |
1600 | { |
1601 | int ret; | |
ffe60014 | 1602 | struct ust_app_stream *stream, *stmp; |
4f3ab6ee DG |
1603 | |
1604 | assert(app); | |
ffe60014 | 1605 | assert(ua_sess); |
4f3ab6ee | 1606 | assert(ua_chan); |
4f3ab6ee | 1607 | |
840cb59c | 1608 | health_code_update(); |
4f3ab6ee | 1609 | |
7972aab2 DG |
1610 | DBG("UST app sending channel %s to UST app sock %d", ua_chan->name, |
1611 | app->sock); | |
86acf0da | 1612 | |
ffe60014 DG |
1613 | /* Send channel to the application. */ |
1614 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
1615 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1616 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1617 | goto error; | |
1618 | } else if (ret < 0) { | |
b551a063 DG |
1619 | goto error; |
1620 | } | |
1621 | ||
d88aee68 DG |
1622 | health_code_update(); |
1623 | ||
ffe60014 DG |
1624 | /* Send all streams to application. */ |
1625 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
1626 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, stream); | |
a7169585 MD |
1627 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
1628 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
1629 | goto error; | |
1630 | } else if (ret < 0) { | |
ffe60014 DG |
1631 | goto error; |
1632 | } | |
1633 | /* We don't need the stream anymore once sent to the tracer. */ | |
1634 | cds_list_del(&stream->list); | |
fb45065e | 1635 | delete_ust_app_stream(-1, stream, app); |
ffe60014 | 1636 | } |
ffe60014 DG |
1637 | /* Flag the channel that it is sent to the application. */ |
1638 | ua_chan->is_sent = 1; | |
ffe60014 | 1639 | |
b551a063 | 1640 | error: |
840cb59c | 1641 | health_code_update(); |
b551a063 DG |
1642 | return ret; |
1643 | } | |
1644 | ||
91d76f53 | 1645 | /* |
5b4a0ec0 | 1646 | * Create the specified event onto the UST tracer for a UST session. |
d0b96690 DG |
1647 | * |
1648 | * Should be called with session mutex held. | |
91d76f53 | 1649 | */ |
edb67388 DG |
1650 | static |
1651 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, | |
1652 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) | |
91d76f53 | 1653 | { |
5b4a0ec0 | 1654 | int ret = 0; |
284d8f55 | 1655 | |
840cb59c | 1656 | health_code_update(); |
86acf0da | 1657 | |
5b4a0ec0 | 1658 | /* Create UST event on tracer */ |
fb45065e | 1659 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 1660 | ret = ustctl_create_event(app->sock, &ua_event->attr, ua_chan->obj, |
5b4a0ec0 | 1661 | &ua_event->obj); |
fb45065e | 1662 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 | 1663 | if (ret < 0) { |
ffe60014 DG |
1664 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
1665 | ERR("Error ustctl create event %s for app pid: %d with ret %d", | |
1666 | ua_event->attr.name, app->pid, ret); | |
1667 | } else { | |
3757b385 DG |
1668 | /* |
1669 | * This is normal behavior, an application can die during the | |
1670 | * creation process. Don't report an error so the execution can | |
1671 | * continue normally. | |
1672 | */ | |
1673 | ret = 0; | |
ffe60014 DG |
1674 | DBG3("UST app create event failed. Application is dead."); |
1675 | } | |
5b4a0ec0 | 1676 | goto error; |
91d76f53 | 1677 | } |
f6a9efaa | 1678 | |
5b4a0ec0 | 1679 | ua_event->handle = ua_event->obj->handle; |
284d8f55 | 1680 | |
5b4a0ec0 | 1681 | DBG2("UST app event %s created successfully for pid:%d", |
852d0037 | 1682 | ua_event->attr.name, app->pid); |
f6a9efaa | 1683 | |
840cb59c | 1684 | health_code_update(); |
86acf0da | 1685 | |
025faf73 DG |
1686 | /* Set filter if one is present. */ |
1687 | if (ua_event->filter) { | |
1688 | ret = set_ust_event_filter(ua_event, app); | |
1689 | if (ret < 0) { | |
1690 | goto error; | |
1691 | } | |
1692 | } | |
1693 | ||
7cc9a73c JI |
1694 | /* Set exclusions for the event */ |
1695 | if (ua_event->exclusion) { | |
1696 | ret = set_ust_event_exclusion(ua_event, app); | |
1697 | if (ret < 0) { | |
1698 | goto error; | |
1699 | } | |
1700 | } | |
1701 | ||
8535a6d9 | 1702 | /* If event not enabled, disable it on the tracer */ |
40113787 MD |
1703 | if (ua_event->enabled) { |
1704 | /* | |
1705 | * We now need to explicitly enable the event, since it | |
1706 | * is now disabled at creation. | |
1707 | */ | |
1708 | ret = enable_ust_event(app, ua_sess, ua_event); | |
1709 | if (ret < 0) { | |
1710 | /* | |
1711 | * If we hit an EPERM, something is wrong with our enable call. If | |
1712 | * we get an EEXIST, there is a problem on the tracer side since we | |
1713 | * just created it. | |
1714 | */ | |
1715 | switch (ret) { | |
1716 | case -LTTNG_UST_ERR_PERM: | |
1717 | /* Code flow problem */ | |
1718 | assert(0); | |
1719 | case -LTTNG_UST_ERR_EXIST: | |
1720 | /* It's OK for our use case. */ | |
1721 | ret = 0; | |
1722 | break; | |
1723 | default: | |
1724 | break; | |
1725 | } | |
1726 | goto error; | |
1727 | } | |
8535a6d9 DG |
1728 | } |
1729 | ||
5b4a0ec0 | 1730 | error: |
840cb59c | 1731 | health_code_update(); |
5b4a0ec0 | 1732 | return ret; |
91d76f53 | 1733 | } |
48842b30 | 1734 | |
5b4a0ec0 DG |
1735 | /* |
1736 | * Copy data between an UST app event and a LTT event. | |
1737 | */ | |
421cb601 | 1738 | static void shadow_copy_event(struct ust_app_event *ua_event, |
48842b30 DG |
1739 | struct ltt_ust_event *uevent) |
1740 | { | |
b4ffad32 JI |
1741 | size_t exclusion_alloc_size; |
1742 | ||
48842b30 DG |
1743 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
1744 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; | |
1745 | ||
fc34caaa DG |
1746 | ua_event->enabled = uevent->enabled; |
1747 | ||
5b4a0ec0 DG |
1748 | /* Copy event attributes */ |
1749 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); | |
1750 | ||
53a80697 MD |
1751 | /* Copy filter bytecode */ |
1752 | if (uevent->filter) { | |
51755dc8 | 1753 | ua_event->filter = copy_filter_bytecode(uevent->filter); |
025faf73 | 1754 | /* Filter might be NULL here in case of ENONEM. */ |
53a80697 | 1755 | } |
b4ffad32 JI |
1756 | |
1757 | /* Copy exclusion data */ | |
1758 | if (uevent->exclusion) { | |
51755dc8 | 1759 | exclusion_alloc_size = sizeof(struct lttng_event_exclusion) + |
b4ffad32 JI |
1760 | LTTNG_UST_SYM_NAME_LEN * uevent->exclusion->count; |
1761 | ua_event->exclusion = zmalloc(exclusion_alloc_size); | |
5f8df26c JI |
1762 | if (ua_event->exclusion == NULL) { |
1763 | PERROR("malloc"); | |
1764 | } else { | |
1765 | memcpy(ua_event->exclusion, uevent->exclusion, | |
1766 | exclusion_alloc_size); | |
b4ffad32 JI |
1767 | } |
1768 | } | |
48842b30 DG |
1769 | } |
1770 | ||
5b4a0ec0 DG |
1771 | /* |
1772 | * Copy data between an UST app channel and a LTT channel. | |
1773 | */ | |
421cb601 | 1774 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
48842b30 DG |
1775 | struct ltt_ust_channel *uchan) |
1776 | { | |
bec39940 | 1777 | struct lttng_ht_iter iter; |
48842b30 | 1778 | struct ltt_ust_event *uevent; |
55cc08a6 | 1779 | struct ltt_ust_context *uctx; |
48842b30 DG |
1780 | struct ust_app_event *ua_event; |
1781 | ||
fc34caaa | 1782 | DBG2("UST app shadow copy of channel %s started", ua_chan->name); |
48842b30 DG |
1783 | |
1784 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); | |
1785 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; | |
ffe60014 | 1786 | |
1624d5b7 JD |
1787 | ua_chan->tracefile_size = uchan->tracefile_size; |
1788 | ua_chan->tracefile_count = uchan->tracefile_count; | |
1789 | ||
ffe60014 DG |
1790 | /* Copy event attributes since the layout is different. */ |
1791 | ua_chan->attr.subbuf_size = uchan->attr.subbuf_size; | |
1792 | ua_chan->attr.num_subbuf = uchan->attr.num_subbuf; | |
1793 | ua_chan->attr.overwrite = uchan->attr.overwrite; | |
1794 | ua_chan->attr.switch_timer_interval = uchan->attr.switch_timer_interval; | |
1795 | ua_chan->attr.read_timer_interval = uchan->attr.read_timer_interval; | |
1796 | ua_chan->attr.output = uchan->attr.output; | |
1797 | /* | |
1798 | * Note that the attribute channel type is not set since the channel on the | |
1799 | * tracing registry side does not have this information. | |
1800 | */ | |
48842b30 | 1801 | |
fc34caaa | 1802 | ua_chan->enabled = uchan->enabled; |
7972aab2 | 1803 | ua_chan->tracing_channel_id = uchan->id; |
fc34caaa | 1804 | |
31746f93 | 1805 | cds_list_for_each_entry(uctx, &uchan->ctx_list, list) { |
bdf64013 JG |
1806 | struct ust_app_ctx *ua_ctx = alloc_ust_app_ctx(&uctx->ctx); |
1807 | ||
55cc08a6 DG |
1808 | if (ua_ctx == NULL) { |
1809 | continue; | |
1810 | } | |
bec39940 DG |
1811 | lttng_ht_node_init_ulong(&ua_ctx->node, |
1812 | (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 1813 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 1814 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
55cc08a6 | 1815 | } |
48842b30 | 1816 | |
421cb601 | 1817 | /* Copy all events from ltt ust channel to ust app channel */ |
bec39940 | 1818 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) { |
18eace3b | 1819 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 1820 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 1821 | if (ua_event == NULL) { |
421cb601 | 1822 | DBG2("UST event %s not found on shadow copy channel", |
48842b30 | 1823 | uevent->attr.name); |
284d8f55 | 1824 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
48842b30 | 1825 | if (ua_event == NULL) { |
5b4a0ec0 | 1826 | continue; |
48842b30 | 1827 | } |
421cb601 | 1828 | shadow_copy_event(ua_event, uevent); |
d0b96690 | 1829 | add_unique_ust_app_event(ua_chan, ua_event); |
48842b30 | 1830 | } |
48842b30 DG |
1831 | } |
1832 | ||
fc34caaa | 1833 | DBG3("UST app shadow copy of channel %s done", ua_chan->name); |
48842b30 DG |
1834 | } |
1835 | ||
5b4a0ec0 DG |
1836 | /* |
1837 | * Copy data between a UST app session and a regular LTT session. | |
1838 | */ | |
421cb601 | 1839 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
bec39940 | 1840 | struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 | 1841 | { |
bec39940 DG |
1842 | struct lttng_ht_node_str *ua_chan_node; |
1843 | struct lttng_ht_iter iter; | |
48842b30 DG |
1844 | struct ltt_ust_channel *uchan; |
1845 | struct ust_app_channel *ua_chan; | |
477d7741 MD |
1846 | time_t rawtime; |
1847 | struct tm *timeinfo; | |
1848 | char datetime[16]; | |
1849 | int ret; | |
d7ba1388 | 1850 | char tmp_shm_path[PATH_MAX]; |
477d7741 MD |
1851 | |
1852 | /* Get date and time for unique app path */ | |
1853 | time(&rawtime); | |
1854 | timeinfo = localtime(&rawtime); | |
1855 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); | |
48842b30 | 1856 | |
421cb601 | 1857 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
48842b30 | 1858 | |
7972aab2 DG |
1859 | ua_sess->tracing_id = usess->id; |
1860 | ua_sess->id = get_next_session_id(); | |
1861 | ua_sess->uid = app->uid; | |
1862 | ua_sess->gid = app->gid; | |
1863 | ua_sess->euid = usess->uid; | |
1864 | ua_sess->egid = usess->gid; | |
1865 | ua_sess->buffer_type = usess->buffer_type; | |
1866 | ua_sess->bits_per_long = app->bits_per_long; | |
6addfa37 | 1867 | |
7972aab2 | 1868 | /* There is only one consumer object per session possible. */ |
6addfa37 | 1869 | consumer_output_get(usess->consumer); |
7972aab2 | 1870 | ua_sess->consumer = usess->consumer; |
6addfa37 | 1871 | |
2bba9e53 | 1872 | ua_sess->output_traces = usess->output_traces; |
ecc48a90 | 1873 | ua_sess->live_timer_interval = usess->live_timer_interval; |
84ad93e8 DG |
1874 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, |
1875 | &usess->metadata_attr); | |
7972aab2 DG |
1876 | |
1877 | switch (ua_sess->buffer_type) { | |
1878 | case LTTNG_BUFFER_PER_PID: | |
1879 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
dec56f6c | 1880 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", app->name, app->pid, |
7972aab2 DG |
1881 | datetime); |
1882 | break; | |
1883 | case LTTNG_BUFFER_PER_UID: | |
1884 | ret = snprintf(ua_sess->path, sizeof(ua_sess->path), | |
1885 | DEFAULT_UST_TRACE_UID_PATH, ua_sess->uid, app->bits_per_long); | |
1886 | break; | |
1887 | default: | |
1888 | assert(0); | |
1889 | goto error; | |
1890 | } | |
477d7741 MD |
1891 | if (ret < 0) { |
1892 | PERROR("asprintf UST shadow copy session"); | |
477d7741 | 1893 | assert(0); |
7972aab2 | 1894 | goto error; |
477d7741 MD |
1895 | } |
1896 | ||
3d071855 MD |
1897 | strncpy(ua_sess->root_shm_path, usess->root_shm_path, |
1898 | sizeof(ua_sess->root_shm_path)); | |
1899 | ua_sess->root_shm_path[sizeof(ua_sess->root_shm_path) - 1] = '\0'; | |
d7ba1388 MD |
1900 | strncpy(ua_sess->shm_path, usess->shm_path, |
1901 | sizeof(ua_sess->shm_path)); | |
1902 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1903 | if (ua_sess->shm_path[0]) { | |
1904 | switch (ua_sess->buffer_type) { | |
1905 | case LTTNG_BUFFER_PER_PID: | |
1906 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1907 | DEFAULT_UST_TRACE_PID_PATH "/%s-%d-%s", | |
1908 | app->name, app->pid, datetime); | |
1909 | break; | |
1910 | case LTTNG_BUFFER_PER_UID: | |
1911 | ret = snprintf(tmp_shm_path, sizeof(tmp_shm_path), | |
1912 | DEFAULT_UST_TRACE_UID_PATH, | |
1913 | app->uid, app->bits_per_long); | |
1914 | break; | |
1915 | default: | |
1916 | assert(0); | |
1917 | goto error; | |
1918 | } | |
1919 | if (ret < 0) { | |
1920 | PERROR("sprintf UST shadow copy session"); | |
1921 | assert(0); | |
1922 | goto error; | |
1923 | } | |
1924 | strncat(ua_sess->shm_path, tmp_shm_path, | |
1925 | sizeof(ua_sess->shm_path) - strlen(ua_sess->shm_path) - 1); | |
1926 | ua_sess->shm_path[sizeof(ua_sess->shm_path) - 1] = '\0'; | |
1927 | } | |
1928 | ||
48842b30 | 1929 | /* Iterate over all channels in global domain. */ |
bec39940 DG |
1930 | cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter, |
1931 | uchan, node.node) { | |
1932 | struct lttng_ht_iter uiter; | |
ba767faf | 1933 | |
bec39940 DG |
1934 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
1935 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
5b4a0ec0 | 1936 | if (ua_chan_node != NULL) { |
fc34caaa | 1937 | /* Session exist. Contiuing. */ |
5b4a0ec0 DG |
1938 | continue; |
1939 | } | |
421cb601 | 1940 | |
5b4a0ec0 DG |
1941 | DBG2("Channel %s not found on shadow session copy, creating it", |
1942 | uchan->name); | |
fb83fe64 JD |
1943 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, |
1944 | &uchan->attr); | |
5b4a0ec0 | 1945 | if (ua_chan == NULL) { |
fc34caaa | 1946 | /* malloc failed FIXME: Might want to do handle ENOMEM .. */ |
5b4a0ec0 | 1947 | continue; |
48842b30 | 1948 | } |
5b4a0ec0 | 1949 | shadow_copy_channel(ua_chan, uchan); |
ffe60014 DG |
1950 | /* |
1951 | * The concept of metadata channel does not exist on the tracing | |
1952 | * registry side of the session daemon so this can only be a per CPU | |
1953 | * channel and not metadata. | |
1954 | */ | |
1955 | ua_chan->attr.type = LTTNG_UST_CHAN_PER_CPU; | |
1956 | ||
bec39940 | 1957 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); |
48842b30 | 1958 | } |
6addfa37 | 1959 | return; |
7972aab2 DG |
1960 | |
1961 | error: | |
6addfa37 | 1962 | consumer_output_put(ua_sess->consumer); |
48842b30 DG |
1963 | } |
1964 | ||
78f0bacd DG |
1965 | /* |
1966 | * Lookup sesison wrapper. | |
1967 | */ | |
84cd17c6 MD |
1968 | static |
1969 | void __lookup_session_by_app(struct ltt_ust_session *usess, | |
bec39940 | 1970 | struct ust_app *app, struct lttng_ht_iter *iter) |
84cd17c6 MD |
1971 | { |
1972 | /* Get right UST app session from app */ | |
d9bf3ca4 | 1973 | lttng_ht_lookup(app->sessions, &usess->id, iter); |
84cd17c6 MD |
1974 | } |
1975 | ||
421cb601 DG |
1976 | /* |
1977 | * Return ust app session from the app session hashtable using the UST session | |
a991f516 | 1978 | * id. |
421cb601 | 1979 | */ |
48842b30 DG |
1980 | static struct ust_app_session *lookup_session_by_app( |
1981 | struct ltt_ust_session *usess, struct ust_app *app) | |
1982 | { | |
bec39940 | 1983 | struct lttng_ht_iter iter; |
d9bf3ca4 | 1984 | struct lttng_ht_node_u64 *node; |
48842b30 | 1985 | |
84cd17c6 | 1986 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 1987 | node = lttng_ht_iter_get_node_u64(&iter); |
48842b30 DG |
1988 | if (node == NULL) { |
1989 | goto error; | |
1990 | } | |
1991 | ||
1992 | return caa_container_of(node, struct ust_app_session, node); | |
1993 | ||
1994 | error: | |
1995 | return NULL; | |
1996 | } | |
1997 | ||
7972aab2 DG |
1998 | /* |
1999 | * Setup buffer registry per PID for the given session and application. If none | |
2000 | * is found, a new one is created, added to the global registry and | |
2001 | * initialized. If regp is valid, it's set with the newly created object. | |
2002 | * | |
2003 | * Return 0 on success or else a negative value. | |
2004 | */ | |
2005 | static int setup_buffer_reg_pid(struct ust_app_session *ua_sess, | |
2006 | struct ust_app *app, struct buffer_reg_pid **regp) | |
2007 | { | |
2008 | int ret = 0; | |
2009 | struct buffer_reg_pid *reg_pid; | |
2010 | ||
2011 | assert(ua_sess); | |
2012 | assert(app); | |
2013 | ||
2014 | rcu_read_lock(); | |
2015 | ||
2016 | reg_pid = buffer_reg_pid_find(ua_sess->id); | |
2017 | if (!reg_pid) { | |
2018 | /* | |
2019 | * This is the create channel path meaning that if there is NO | |
2020 | * registry available, we have to create one for this session. | |
2021 | */ | |
d7ba1388 | 2022 | ret = buffer_reg_pid_create(ua_sess->id, ®_pid, |
3d071855 | 2023 | ua_sess->root_shm_path, ua_sess->shm_path); |
7972aab2 DG |
2024 | if (ret < 0) { |
2025 | goto error; | |
2026 | } | |
7972aab2 DG |
2027 | } else { |
2028 | goto end; | |
2029 | } | |
2030 | ||
2031 | /* Initialize registry. */ | |
2032 | ret = ust_registry_session_init(®_pid->registry->reg.ust, app, | |
2033 | app->bits_per_long, app->uint8_t_alignment, | |
2034 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2035 | app->uint64_t_alignment, app->long_alignment, |
2036 | app->byte_order, app->version.major, | |
3d071855 MD |
2037 | app->version.minor, reg_pid->root_shm_path, |
2038 | reg_pid->shm_path, | |
d7ba1388 | 2039 | ua_sess->euid, ua_sess->egid); |
7972aab2 | 2040 | if (ret < 0) { |
286c991a MD |
2041 | /* |
2042 | * reg_pid->registry->reg.ust is NULL upon error, so we need to | |
2043 | * destroy the buffer registry, because it is always expected | |
2044 | * that if the buffer registry can be found, its ust registry is | |
2045 | * non-NULL. | |
2046 | */ | |
2047 | buffer_reg_pid_destroy(reg_pid); | |
7972aab2 DG |
2048 | goto error; |
2049 | } | |
2050 | ||
286c991a MD |
2051 | buffer_reg_pid_add(reg_pid); |
2052 | ||
7972aab2 DG |
2053 | DBG3("UST app buffer registry per PID created successfully"); |
2054 | ||
2055 | end: | |
2056 | if (regp) { | |
2057 | *regp = reg_pid; | |
2058 | } | |
2059 | error: | |
2060 | rcu_read_unlock(); | |
2061 | return ret; | |
2062 | } | |
2063 | ||
2064 | /* | |
2065 | * Setup buffer registry per UID for the given session and application. If none | |
2066 | * is found, a new one is created, added to the global registry and | |
2067 | * initialized. If regp is valid, it's set with the newly created object. | |
2068 | * | |
2069 | * Return 0 on success or else a negative value. | |
2070 | */ | |
2071 | static int setup_buffer_reg_uid(struct ltt_ust_session *usess, | |
d7ba1388 | 2072 | struct ust_app_session *ua_sess, |
7972aab2 DG |
2073 | struct ust_app *app, struct buffer_reg_uid **regp) |
2074 | { | |
2075 | int ret = 0; | |
2076 | struct buffer_reg_uid *reg_uid; | |
2077 | ||
2078 | assert(usess); | |
2079 | assert(app); | |
2080 | ||
2081 | rcu_read_lock(); | |
2082 | ||
2083 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2084 | if (!reg_uid) { | |
2085 | /* | |
2086 | * This is the create channel path meaning that if there is NO | |
2087 | * registry available, we have to create one for this session. | |
2088 | */ | |
2089 | ret = buffer_reg_uid_create(usess->id, app->bits_per_long, app->uid, | |
3d071855 MD |
2090 | LTTNG_DOMAIN_UST, ®_uid, |
2091 | ua_sess->root_shm_path, ua_sess->shm_path); | |
7972aab2 DG |
2092 | if (ret < 0) { |
2093 | goto error; | |
2094 | } | |
7972aab2 DG |
2095 | } else { |
2096 | goto end; | |
2097 | } | |
2098 | ||
2099 | /* Initialize registry. */ | |
af6142cf | 2100 | ret = ust_registry_session_init(®_uid->registry->reg.ust, NULL, |
7972aab2 DG |
2101 | app->bits_per_long, app->uint8_t_alignment, |
2102 | app->uint16_t_alignment, app->uint32_t_alignment, | |
af6142cf MD |
2103 | app->uint64_t_alignment, app->long_alignment, |
2104 | app->byte_order, app->version.major, | |
3d071855 MD |
2105 | app->version.minor, reg_uid->root_shm_path, |
2106 | reg_uid->shm_path, usess->uid, usess->gid); | |
7972aab2 | 2107 | if (ret < 0) { |
286c991a MD |
2108 | /* |
2109 | * reg_uid->registry->reg.ust is NULL upon error, so we need to | |
2110 | * destroy the buffer registry, because it is always expected | |
2111 | * that if the buffer registry can be found, its ust registry is | |
2112 | * non-NULL. | |
2113 | */ | |
2114 | buffer_reg_uid_destroy(reg_uid, NULL); | |
7972aab2 DG |
2115 | goto error; |
2116 | } | |
2117 | /* Add node to teardown list of the session. */ | |
2118 | cds_list_add(®_uid->lnode, &usess->buffer_reg_uid_list); | |
2119 | ||
286c991a | 2120 | buffer_reg_uid_add(reg_uid); |
7972aab2 | 2121 | |
286c991a | 2122 | DBG3("UST app buffer registry per UID created successfully"); |
7972aab2 DG |
2123 | end: |
2124 | if (regp) { | |
2125 | *regp = reg_uid; | |
2126 | } | |
2127 | error: | |
2128 | rcu_read_unlock(); | |
2129 | return ret; | |
2130 | } | |
2131 | ||
421cb601 | 2132 | /* |
3d8ca23b | 2133 | * Create a session on the tracer side for the given app. |
421cb601 | 2134 | * |
3d8ca23b DG |
2135 | * On success, ua_sess_ptr is populated with the session pointer or else left |
2136 | * untouched. If the session was created, is_created is set to 1. On error, | |
2137 | * it's left untouched. Note that ua_sess_ptr is mandatory but is_created can | |
2138 | * be NULL. | |
2139 | * | |
2140 | * Returns 0 on success or else a negative code which is either -ENOMEM or | |
2141 | * -ENOTCONN which is the default code if the ustctl_create_session fails. | |
421cb601 | 2142 | */ |
3d8ca23b DG |
2143 | static int create_ust_app_session(struct ltt_ust_session *usess, |
2144 | struct ust_app *app, struct ust_app_session **ua_sess_ptr, | |
2145 | int *is_created) | |
421cb601 | 2146 | { |
3d8ca23b | 2147 | int ret, created = 0; |
421cb601 DG |
2148 | struct ust_app_session *ua_sess; |
2149 | ||
3d8ca23b DG |
2150 | assert(usess); |
2151 | assert(app); | |
2152 | assert(ua_sess_ptr); | |
2153 | ||
840cb59c | 2154 | health_code_update(); |
86acf0da | 2155 | |
421cb601 DG |
2156 | ua_sess = lookup_session_by_app(usess, app); |
2157 | if (ua_sess == NULL) { | |
d9bf3ca4 | 2158 | DBG2("UST app pid: %d session id %" PRIu64 " not found, creating it", |
852d0037 | 2159 | app->pid, usess->id); |
d0b96690 | 2160 | ua_sess = alloc_ust_app_session(app); |
421cb601 DG |
2161 | if (ua_sess == NULL) { |
2162 | /* Only malloc can failed so something is really wrong */ | |
3d8ca23b DG |
2163 | ret = -ENOMEM; |
2164 | goto error; | |
421cb601 | 2165 | } |
477d7741 | 2166 | shadow_copy_session(ua_sess, usess, app); |
3d8ca23b | 2167 | created = 1; |
421cb601 DG |
2168 | } |
2169 | ||
7972aab2 DG |
2170 | switch (usess->buffer_type) { |
2171 | case LTTNG_BUFFER_PER_PID: | |
2172 | /* Init local registry. */ | |
2173 | ret = setup_buffer_reg_pid(ua_sess, app, NULL); | |
421cb601 | 2174 | if (ret < 0) { |
e64207cf | 2175 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2176 | goto error; |
2177 | } | |
2178 | break; | |
2179 | case LTTNG_BUFFER_PER_UID: | |
2180 | /* Look for a global registry. If none exists, create one. */ | |
d7ba1388 | 2181 | ret = setup_buffer_reg_uid(usess, ua_sess, app, NULL); |
7972aab2 | 2182 | if (ret < 0) { |
e64207cf | 2183 | delete_ust_app_session(-1, ua_sess, app); |
7972aab2 DG |
2184 | goto error; |
2185 | } | |
2186 | break; | |
2187 | default: | |
2188 | assert(0); | |
2189 | ret = -EINVAL; | |
2190 | goto error; | |
2191 | } | |
2192 | ||
2193 | health_code_update(); | |
2194 | ||
2195 | if (ua_sess->handle == -1) { | |
fb45065e | 2196 | pthread_mutex_lock(&app->sock_lock); |
7972aab2 | 2197 | ret = ustctl_create_session(app->sock); |
fb45065e | 2198 | pthread_mutex_unlock(&app->sock_lock); |
7972aab2 DG |
2199 | if (ret < 0) { |
2200 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
2201 | ERR("Creating session for app pid %d with ret %d", | |
ffe60014 DG |
2202 | app->pid, ret); |
2203 | } else { | |
2204 | DBG("UST app creating session failed. Application is dead"); | |
3757b385 DG |
2205 | /* |
2206 | * This is normal behavior, an application can die during the | |
2207 | * creation process. Don't report an error so the execution can | |
2208 | * continue normally. This will get flagged ENOTCONN and the | |
2209 | * caller will handle it. | |
2210 | */ | |
2211 | ret = 0; | |
ffe60014 | 2212 | } |
d0b96690 | 2213 | delete_ust_app_session(-1, ua_sess, app); |
3d8ca23b DG |
2214 | if (ret != -ENOMEM) { |
2215 | /* | |
2216 | * Tracer is probably gone or got an internal error so let's | |
2217 | * behave like it will soon unregister or not usable. | |
2218 | */ | |
2219 | ret = -ENOTCONN; | |
2220 | } | |
2221 | goto error; | |
421cb601 DG |
2222 | } |
2223 | ||
7972aab2 DG |
2224 | ua_sess->handle = ret; |
2225 | ||
2226 | /* Add ust app session to app's HT */ | |
d9bf3ca4 MD |
2227 | lttng_ht_node_init_u64(&ua_sess->node, |
2228 | ua_sess->tracing_id); | |
2229 | lttng_ht_add_unique_u64(app->sessions, &ua_sess->node); | |
10b56aef MD |
2230 | lttng_ht_node_init_ulong(&ua_sess->ust_objd_node, ua_sess->handle); |
2231 | lttng_ht_add_unique_ulong(app->ust_sessions_objd, | |
2232 | &ua_sess->ust_objd_node); | |
7972aab2 DG |
2233 | |
2234 | DBG2("UST app session created successfully with handle %d", ret); | |
2235 | } | |
2236 | ||
2237 | *ua_sess_ptr = ua_sess; | |
2238 | if (is_created) { | |
2239 | *is_created = created; | |
2240 | } | |
2241 | ||
2242 | /* Everything went well. */ | |
2243 | ret = 0; | |
2244 | ||
2245 | error: | |
2246 | health_code_update(); | |
2247 | return ret; | |
2248 | } | |
2249 | ||
6a6b2068 JG |
2250 | /* |
2251 | * Match function for a hash table lookup of ust_app_ctx. | |
2252 | * | |
2253 | * It matches an ust app context based on the context type and, in the case | |
2254 | * of perf counters, their name. | |
2255 | */ | |
2256 | static int ht_match_ust_app_ctx(struct cds_lfht_node *node, const void *_key) | |
2257 | { | |
2258 | struct ust_app_ctx *ctx; | |
bdf64013 | 2259 | const struct lttng_ust_context_attr *key; |
6a6b2068 JG |
2260 | |
2261 | assert(node); | |
2262 | assert(_key); | |
2263 | ||
2264 | ctx = caa_container_of(node, struct ust_app_ctx, node.node); | |
2265 | key = _key; | |
2266 | ||
2267 | /* Context type */ | |
2268 | if (ctx->ctx.ctx != key->ctx) { | |
2269 | goto no_match; | |
2270 | } | |
2271 | ||
bdf64013 JG |
2272 | switch(key->ctx) { |
2273 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: | |
6a6b2068 | 2274 | if (strncmp(key->u.perf_counter.name, |
bdf64013 JG |
2275 | ctx->ctx.u.perf_counter.name, |
2276 | sizeof(key->u.perf_counter.name))) { | |
2277 | goto no_match; | |
2278 | } | |
2279 | break; | |
2280 | case LTTNG_UST_CONTEXT_APP_CONTEXT: | |
2281 | if (strcmp(key->u.app_ctx.provider_name, | |
2282 | ctx->ctx.u.app_ctx.provider_name) || | |
2283 | strcmp(key->u.app_ctx.ctx_name, | |
2284 | ctx->ctx.u.app_ctx.ctx_name)) { | |
6a6b2068 JG |
2285 | goto no_match; |
2286 | } | |
bdf64013 JG |
2287 | break; |
2288 | default: | |
2289 | break; | |
6a6b2068 JG |
2290 | } |
2291 | ||
2292 | /* Match. */ | |
2293 | return 1; | |
2294 | ||
2295 | no_match: | |
2296 | return 0; | |
2297 | } | |
2298 | ||
2299 | /* | |
2300 | * Lookup for an ust app context from an lttng_ust_context. | |
2301 | * | |
be184a0f | 2302 | * Must be called while holding RCU read side lock. |
6a6b2068 JG |
2303 | * Return an ust_app_ctx object or NULL on error. |
2304 | */ | |
2305 | static | |
2306 | struct ust_app_ctx *find_ust_app_context(struct lttng_ht *ht, | |
bdf64013 | 2307 | struct lttng_ust_context_attr *uctx) |
6a6b2068 JG |
2308 | { |
2309 | struct lttng_ht_iter iter; | |
2310 | struct lttng_ht_node_ulong *node; | |
2311 | struct ust_app_ctx *app_ctx = NULL; | |
2312 | ||
2313 | assert(uctx); | |
2314 | assert(ht); | |
2315 | ||
2316 | /* Lookup using the lttng_ust_context_type and a custom match fct. */ | |
2317 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) uctx->ctx, lttng_ht_seed), | |
2318 | ht_match_ust_app_ctx, uctx, &iter.iter); | |
2319 | node = lttng_ht_iter_get_node_ulong(&iter); | |
2320 | if (!node) { | |
2321 | goto end; | |
2322 | } | |
2323 | ||
2324 | app_ctx = caa_container_of(node, struct ust_app_ctx, node); | |
2325 | ||
2326 | end: | |
2327 | return app_ctx; | |
2328 | } | |
2329 | ||
7972aab2 DG |
2330 | /* |
2331 | * Create a context for the channel on the tracer. | |
2332 | * | |
2333 | * Called with UST app session lock held and a RCU read side lock. | |
2334 | */ | |
2335 | static | |
2336 | int create_ust_app_channel_context(struct ust_app_session *ua_sess, | |
bdf64013 JG |
2337 | struct ust_app_channel *ua_chan, |
2338 | struct lttng_ust_context_attr *uctx, | |
7972aab2 DG |
2339 | struct ust_app *app) |
2340 | { | |
2341 | int ret = 0; | |
7972aab2 DG |
2342 | struct ust_app_ctx *ua_ctx; |
2343 | ||
2344 | DBG2("UST app adding context to channel %s", ua_chan->name); | |
2345 | ||
6a6b2068 JG |
2346 | ua_ctx = find_ust_app_context(ua_chan->ctx, uctx); |
2347 | if (ua_ctx) { | |
7972aab2 DG |
2348 | ret = -EEXIST; |
2349 | goto error; | |
2350 | } | |
2351 | ||
2352 | ua_ctx = alloc_ust_app_ctx(uctx); | |
2353 | if (ua_ctx == NULL) { | |
2354 | /* malloc failed */ | |
2355 | ret = -1; | |
2356 | goto error; | |
2357 | } | |
2358 | ||
2359 | lttng_ht_node_init_ulong(&ua_ctx->node, (unsigned long) ua_ctx->ctx.ctx); | |
aa3514e9 | 2360 | lttng_ht_add_ulong(ua_chan->ctx, &ua_ctx->node); |
31746f93 | 2361 | cds_list_add_tail(&ua_ctx->list, &ua_chan->ctx_list); |
7972aab2 DG |
2362 | |
2363 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); | |
2364 | if (ret < 0) { | |
2365 | goto error; | |
2366 | } | |
2367 | ||
2368 | error: | |
2369 | return ret; | |
2370 | } | |
2371 | ||
2372 | /* | |
2373 | * Enable on the tracer side a ust app event for the session and channel. | |
2374 | * | |
2375 | * Called with UST app session lock held. | |
2376 | */ | |
2377 | static | |
2378 | int enable_ust_app_event(struct ust_app_session *ua_sess, | |
2379 | struct ust_app_event *ua_event, struct ust_app *app) | |
2380 | { | |
2381 | int ret; | |
2382 | ||
2383 | ret = enable_ust_event(app, ua_sess, ua_event); | |
2384 | if (ret < 0) { | |
2385 | goto error; | |
2386 | } | |
2387 | ||
2388 | ua_event->enabled = 1; | |
2389 | ||
2390 | error: | |
2391 | return ret; | |
2392 | } | |
2393 | ||
2394 | /* | |
2395 | * Disable on the tracer side a ust app event for the session and channel. | |
2396 | */ | |
2397 | static int disable_ust_app_event(struct ust_app_session *ua_sess, | |
2398 | struct ust_app_event *ua_event, struct ust_app *app) | |
2399 | { | |
2400 | int ret; | |
2401 | ||
2402 | ret = disable_ust_event(app, ua_sess, ua_event); | |
2403 | if (ret < 0) { | |
2404 | goto error; | |
2405 | } | |
2406 | ||
2407 | ua_event->enabled = 0; | |
2408 | ||
2409 | error: | |
2410 | return ret; | |
2411 | } | |
2412 | ||
2413 | /* | |
2414 | * Lookup ust app channel for session and disable it on the tracer side. | |
2415 | */ | |
2416 | static | |
2417 | int disable_ust_app_channel(struct ust_app_session *ua_sess, | |
2418 | struct ust_app_channel *ua_chan, struct ust_app *app) | |
2419 | { | |
2420 | int ret; | |
2421 | ||
2422 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
2423 | if (ret < 0) { | |
2424 | goto error; | |
2425 | } | |
2426 | ||
2427 | ua_chan->enabled = 0; | |
2428 | ||
2429 | error: | |
2430 | return ret; | |
2431 | } | |
2432 | ||
2433 | /* | |
2434 | * Lookup ust app channel for session and enable it on the tracer side. This | |
2435 | * MUST be called with a RCU read side lock acquired. | |
2436 | */ | |
2437 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, | |
2438 | struct ltt_ust_channel *uchan, struct ust_app *app) | |
2439 | { | |
2440 | int ret = 0; | |
2441 | struct lttng_ht_iter iter; | |
2442 | struct lttng_ht_node_str *ua_chan_node; | |
2443 | struct ust_app_channel *ua_chan; | |
2444 | ||
2445 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); | |
2446 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
2447 | if (ua_chan_node == NULL) { | |
d9bf3ca4 | 2448 | DBG2("Unable to find channel %s in ust session id %" PRIu64, |
7972aab2 DG |
2449 | uchan->name, ua_sess->tracing_id); |
2450 | goto error; | |
2451 | } | |
2452 | ||
2453 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
2454 | ||
2455 | ret = enable_ust_channel(app, ua_sess, ua_chan); | |
2456 | if (ret < 0) { | |
2457 | goto error; | |
2458 | } | |
2459 | ||
2460 | error: | |
2461 | return ret; | |
2462 | } | |
2463 | ||
2464 | /* | |
2465 | * Ask the consumer to create a channel and get it if successful. | |
2466 | * | |
2467 | * Return 0 on success or else a negative value. | |
2468 | */ | |
2469 | static int do_consumer_create_channel(struct ltt_ust_session *usess, | |
2470 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, | |
2471 | int bitness, struct ust_registry_session *registry) | |
2472 | { | |
2473 | int ret; | |
2474 | unsigned int nb_fd = 0; | |
2475 | struct consumer_socket *socket; | |
2476 | ||
2477 | assert(usess); | |
2478 | assert(ua_sess); | |
2479 | assert(ua_chan); | |
2480 | assert(registry); | |
2481 | ||
2482 | rcu_read_lock(); | |
2483 | health_code_update(); | |
2484 | ||
2485 | /* Get the right consumer socket for the application. */ | |
2486 | socket = consumer_find_socket_by_bitness(bitness, usess->consumer); | |
2487 | if (!socket) { | |
2488 | ret = -EINVAL; | |
2489 | goto error; | |
2490 | } | |
2491 | ||
2492 | health_code_update(); | |
2493 | ||
2494 | /* Need one fd for the channel. */ | |
2495 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2496 | if (ret < 0) { | |
2497 | ERR("Exhausted number of available FD upon create channel"); | |
2498 | goto error; | |
2499 | } | |
2500 | ||
2501 | /* | |
2502 | * Ask consumer to create channel. The consumer will return the number of | |
2503 | * stream we have to expect. | |
2504 | */ | |
2505 | ret = ust_consumer_ask_channel(ua_sess, ua_chan, usess->consumer, socket, | |
2506 | registry); | |
2507 | if (ret < 0) { | |
2508 | goto error_ask; | |
2509 | } | |
2510 | ||
2511 | /* | |
2512 | * Compute the number of fd needed before receiving them. It must be 2 per | |
2513 | * stream (2 being the default value here). | |
2514 | */ | |
2515 | nb_fd = DEFAULT_UST_STREAM_FD_NUM * ua_chan->expected_stream_count; | |
2516 | ||
2517 | /* Reserve the amount of file descriptor we need. */ | |
2518 | ret = lttng_fd_get(LTTNG_FD_APPS, nb_fd); | |
2519 | if (ret < 0) { | |
2520 | ERR("Exhausted number of available FD upon create channel"); | |
2521 | goto error_fd_get_stream; | |
2522 | } | |
2523 | ||
2524 | health_code_update(); | |
2525 | ||
2526 | /* | |
2527 | * Now get the channel from the consumer. This call wil populate the stream | |
2528 | * list of that channel and set the ust objects. | |
2529 | */ | |
d9078d0c DG |
2530 | if (usess->consumer->enabled) { |
2531 | ret = ust_consumer_get_channel(socket, ua_chan); | |
2532 | if (ret < 0) { | |
2533 | goto error_destroy; | |
2534 | } | |
7972aab2 DG |
2535 | } |
2536 | ||
2537 | rcu_read_unlock(); | |
2538 | return 0; | |
2539 | ||
2540 | error_destroy: | |
2541 | lttng_fd_put(LTTNG_FD_APPS, nb_fd); | |
2542 | error_fd_get_stream: | |
2543 | /* | |
2544 | * Initiate a destroy channel on the consumer since we had an error | |
2545 | * handling it on our side. The return value is of no importance since we | |
2546 | * already have a ret value set by the previous error that we need to | |
2547 | * return. | |
2548 | */ | |
2549 | (void) ust_consumer_destroy_channel(socket, ua_chan); | |
2550 | error_ask: | |
2551 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2552 | error: | |
2553 | health_code_update(); | |
2554 | rcu_read_unlock(); | |
2555 | return ret; | |
2556 | } | |
2557 | ||
2558 | /* | |
2559 | * Duplicate the ust data object of the ust app stream and save it in the | |
2560 | * buffer registry stream. | |
2561 | * | |
2562 | * Return 0 on success or else a negative value. | |
2563 | */ | |
2564 | static int duplicate_stream_object(struct buffer_reg_stream *reg_stream, | |
2565 | struct ust_app_stream *stream) | |
2566 | { | |
2567 | int ret; | |
2568 | ||
2569 | assert(reg_stream); | |
2570 | assert(stream); | |
2571 | ||
2572 | /* Reserve the amount of file descriptor we need. */ | |
2573 | ret = lttng_fd_get(LTTNG_FD_APPS, 2); | |
2574 | if (ret < 0) { | |
2575 | ERR("Exhausted number of available FD upon duplicate stream"); | |
2576 | goto error; | |
2577 | } | |
2578 | ||
2579 | /* Duplicate object for stream once the original is in the registry. */ | |
2580 | ret = ustctl_duplicate_ust_object_data(&stream->obj, | |
2581 | reg_stream->obj.ust); | |
2582 | if (ret < 0) { | |
2583 | ERR("Duplicate stream obj from %p to %p failed with ret %d", | |
2584 | reg_stream->obj.ust, stream->obj, ret); | |
2585 | lttng_fd_put(LTTNG_FD_APPS, 2); | |
2586 | goto error; | |
2587 | } | |
2588 | stream->handle = stream->obj->handle; | |
2589 | ||
2590 | error: | |
2591 | return ret; | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * Duplicate the ust data object of the ust app. channel and save it in the | |
2596 | * buffer registry channel. | |
2597 | * | |
2598 | * Return 0 on success or else a negative value. | |
2599 | */ | |
2600 | static int duplicate_channel_object(struct buffer_reg_channel *reg_chan, | |
2601 | struct ust_app_channel *ua_chan) | |
2602 | { | |
2603 | int ret; | |
2604 | ||
2605 | assert(reg_chan); | |
2606 | assert(ua_chan); | |
2607 | ||
2608 | /* Need two fds for the channel. */ | |
2609 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
2610 | if (ret < 0) { | |
2611 | ERR("Exhausted number of available FD upon duplicate channel"); | |
2612 | goto error_fd_get; | |
2613 | } | |
2614 | ||
2615 | /* Duplicate object for stream once the original is in the registry. */ | |
2616 | ret = ustctl_duplicate_ust_object_data(&ua_chan->obj, reg_chan->obj.ust); | |
2617 | if (ret < 0) { | |
2618 | ERR("Duplicate channel obj from %p to %p failed with ret: %d", | |
2619 | reg_chan->obj.ust, ua_chan->obj, ret); | |
2620 | goto error; | |
2621 | } | |
2622 | ua_chan->handle = ua_chan->obj->handle; | |
2623 | ||
2624 | return 0; | |
2625 | ||
2626 | error: | |
2627 | lttng_fd_put(LTTNG_FD_APPS, 1); | |
2628 | error_fd_get: | |
2629 | return ret; | |
2630 | } | |
2631 | ||
2632 | /* | |
2633 | * For a given channel buffer registry, setup all streams of the given ust | |
2634 | * application channel. | |
2635 | * | |
2636 | * Return 0 on success or else a negative value. | |
2637 | */ | |
2638 | static int setup_buffer_reg_streams(struct buffer_reg_channel *reg_chan, | |
fb45065e MD |
2639 | struct ust_app_channel *ua_chan, |
2640 | struct ust_app *app) | |
7972aab2 DG |
2641 | { |
2642 | int ret = 0; | |
2643 | struct ust_app_stream *stream, *stmp; | |
2644 | ||
2645 | assert(reg_chan); | |
2646 | assert(ua_chan); | |
2647 | ||
2648 | DBG2("UST app setup buffer registry stream"); | |
2649 | ||
2650 | /* Send all streams to application. */ | |
2651 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { | |
2652 | struct buffer_reg_stream *reg_stream; | |
2653 | ||
2654 | ret = buffer_reg_stream_create(®_stream); | |
2655 | if (ret < 0) { | |
2656 | goto error; | |
2657 | } | |
2658 | ||
2659 | /* | |
2660 | * Keep original pointer and nullify it in the stream so the delete | |
2661 | * stream call does not release the object. | |
2662 | */ | |
2663 | reg_stream->obj.ust = stream->obj; | |
2664 | stream->obj = NULL; | |
2665 | buffer_reg_stream_add(reg_stream, reg_chan); | |
421cb601 | 2666 | |
7972aab2 DG |
2667 | /* We don't need the streams anymore. */ |
2668 | cds_list_del(&stream->list); | |
fb45065e | 2669 | delete_ust_app_stream(-1, stream, app); |
7972aab2 | 2670 | } |
421cb601 | 2671 | |
7972aab2 DG |
2672 | error: |
2673 | return ret; | |
2674 | } | |
2675 | ||
2676 | /* | |
2677 | * Create a buffer registry channel for the given session registry and | |
2678 | * application channel object. If regp pointer is valid, it's set with the | |
2679 | * created object. Important, the created object is NOT added to the session | |
2680 | * registry hash table. | |
2681 | * | |
2682 | * Return 0 on success else a negative value. | |
2683 | */ | |
2684 | static int create_buffer_reg_channel(struct buffer_reg_session *reg_sess, | |
2685 | struct ust_app_channel *ua_chan, struct buffer_reg_channel **regp) | |
2686 | { | |
2687 | int ret; | |
2688 | struct buffer_reg_channel *reg_chan = NULL; | |
2689 | ||
2690 | assert(reg_sess); | |
2691 | assert(ua_chan); | |
2692 | ||
2693 | DBG2("UST app creating buffer registry channel for %s", ua_chan->name); | |
2694 | ||
2695 | /* Create buffer registry channel. */ | |
2696 | ret = buffer_reg_channel_create(ua_chan->tracing_channel_id, ®_chan); | |
2697 | if (ret < 0) { | |
2698 | goto error_create; | |
421cb601 | 2699 | } |
7972aab2 DG |
2700 | assert(reg_chan); |
2701 | reg_chan->consumer_key = ua_chan->key; | |
8c924c7b | 2702 | reg_chan->subbuf_size = ua_chan->attr.subbuf_size; |
d07ceecd | 2703 | reg_chan->num_subbuf = ua_chan->attr.num_subbuf; |
421cb601 | 2704 | |
7972aab2 DG |
2705 | /* Create and add a channel registry to session. */ |
2706 | ret = ust_registry_channel_add(reg_sess->reg.ust, | |
2707 | ua_chan->tracing_channel_id); | |
2708 | if (ret < 0) { | |
2709 | goto error; | |
d88aee68 | 2710 | } |
7972aab2 | 2711 | buffer_reg_channel_add(reg_sess, reg_chan); |
d88aee68 | 2712 | |
7972aab2 DG |
2713 | if (regp) { |
2714 | *regp = reg_chan; | |
3d8ca23b | 2715 | } |
d88aee68 | 2716 | |
7972aab2 | 2717 | return 0; |
3d8ca23b DG |
2718 | |
2719 | error: | |
7972aab2 DG |
2720 | /* Safe because the registry channel object was not added to any HT. */ |
2721 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
2722 | error_create: | |
3d8ca23b | 2723 | return ret; |
421cb601 DG |
2724 | } |
2725 | ||
55cc08a6 | 2726 | /* |
7972aab2 DG |
2727 | * Setup buffer registry channel for the given session registry and application |
2728 | * channel object. If regp pointer is valid, it's set with the created object. | |
d0b96690 | 2729 | * |
7972aab2 | 2730 | * Return 0 on success else a negative value. |
55cc08a6 | 2731 | */ |
7972aab2 | 2732 | static int setup_buffer_reg_channel(struct buffer_reg_session *reg_sess, |
fb45065e MD |
2733 | struct ust_app_channel *ua_chan, struct buffer_reg_channel *reg_chan, |
2734 | struct ust_app *app) | |
55cc08a6 | 2735 | { |
7972aab2 | 2736 | int ret; |
55cc08a6 | 2737 | |
7972aab2 DG |
2738 | assert(reg_sess); |
2739 | assert(reg_chan); | |
2740 | assert(ua_chan); | |
2741 | assert(ua_chan->obj); | |
55cc08a6 | 2742 | |
7972aab2 | 2743 | DBG2("UST app setup buffer registry channel for %s", ua_chan->name); |
55cc08a6 | 2744 | |
7972aab2 | 2745 | /* Setup all streams for the registry. */ |
fb45065e | 2746 | ret = setup_buffer_reg_streams(reg_chan, ua_chan, app); |
7972aab2 | 2747 | if (ret < 0) { |
55cc08a6 DG |
2748 | goto error; |
2749 | } | |
2750 | ||
7972aab2 DG |
2751 | reg_chan->obj.ust = ua_chan->obj; |
2752 | ua_chan->obj = NULL; | |
55cc08a6 | 2753 | |
7972aab2 | 2754 | return 0; |
55cc08a6 DG |
2755 | |
2756 | error: | |
7972aab2 DG |
2757 | buffer_reg_channel_remove(reg_sess, reg_chan); |
2758 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
55cc08a6 DG |
2759 | return ret; |
2760 | } | |
2761 | ||
edb67388 | 2762 | /* |
7972aab2 | 2763 | * Send buffer registry channel to the application. |
d0b96690 | 2764 | * |
7972aab2 | 2765 | * Return 0 on success else a negative value. |
edb67388 | 2766 | */ |
7972aab2 DG |
2767 | static int send_channel_uid_to_ust(struct buffer_reg_channel *reg_chan, |
2768 | struct ust_app *app, struct ust_app_session *ua_sess, | |
2769 | struct ust_app_channel *ua_chan) | |
edb67388 DG |
2770 | { |
2771 | int ret; | |
7972aab2 | 2772 | struct buffer_reg_stream *reg_stream; |
edb67388 | 2773 | |
7972aab2 DG |
2774 | assert(reg_chan); |
2775 | assert(app); | |
2776 | assert(ua_sess); | |
2777 | assert(ua_chan); | |
2778 | ||
2779 | DBG("UST app sending buffer registry channel to ust sock %d", app->sock); | |
2780 | ||
2781 | ret = duplicate_channel_object(reg_chan, ua_chan); | |
edb67388 DG |
2782 | if (ret < 0) { |
2783 | goto error; | |
2784 | } | |
2785 | ||
7972aab2 DG |
2786 | /* Send channel to the application. */ |
2787 | ret = ust_consumer_send_channel_to_ust(app, ua_sess, ua_chan); | |
a7169585 MD |
2788 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2789 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
2790 | goto error; | |
2791 | } else if (ret < 0) { | |
7972aab2 DG |
2792 | goto error; |
2793 | } | |
2794 | ||
2795 | health_code_update(); | |
2796 | ||
2797 | /* Send all streams to application. */ | |
2798 | pthread_mutex_lock(®_chan->stream_list_lock); | |
2799 | cds_list_for_each_entry(reg_stream, ®_chan->streams, lnode) { | |
2800 | struct ust_app_stream stream; | |
2801 | ||
2802 | ret = duplicate_stream_object(reg_stream, &stream); | |
2803 | if (ret < 0) { | |
2804 | goto error_stream_unlock; | |
2805 | } | |
2806 | ||
2807 | ret = ust_consumer_send_stream_to_ust(app, ua_chan, &stream); | |
2808 | if (ret < 0) { | |
fb45065e | 2809 | (void) release_ust_app_stream(-1, &stream, app); |
a7169585 MD |
2810 | if (ret == -EPIPE || ret == -LTTNG_UST_ERR_EXITING) { |
2811 | ret = -ENOTCONN; /* Caused by app exiting. */ | |
a7169585 | 2812 | } |
7972aab2 DG |
2813 | goto error_stream_unlock; |
2814 | } | |
edb67388 | 2815 | |
7972aab2 DG |
2816 | /* |
2817 | * The return value is not important here. This function will output an | |
2818 | * error if needed. | |
2819 | */ | |
fb45065e | 2820 | (void) release_ust_app_stream(-1, &stream, app); |
7972aab2 DG |
2821 | } |
2822 | ua_chan->is_sent = 1; | |
2823 | ||
2824 | error_stream_unlock: | |
2825 | pthread_mutex_unlock(®_chan->stream_list_lock); | |
edb67388 DG |
2826 | error: |
2827 | return ret; | |
2828 | } | |
2829 | ||
9730260e | 2830 | /* |
7972aab2 DG |
2831 | * Create and send to the application the created buffers with per UID buffers. |
2832 | * | |
2833 | * Return 0 on success else a negative value. | |
9730260e | 2834 | */ |
7972aab2 DG |
2835 | static int create_channel_per_uid(struct ust_app *app, |
2836 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2837 | struct ust_app_channel *ua_chan) | |
9730260e DG |
2838 | { |
2839 | int ret; | |
7972aab2 DG |
2840 | struct buffer_reg_uid *reg_uid; |
2841 | struct buffer_reg_channel *reg_chan; | |
9730260e | 2842 | |
7972aab2 DG |
2843 | assert(app); |
2844 | assert(usess); | |
2845 | assert(ua_sess); | |
2846 | assert(ua_chan); | |
2847 | ||
2848 | DBG("UST app creating channel %s with per UID buffers", ua_chan->name); | |
2849 | ||
2850 | reg_uid = buffer_reg_uid_find(usess->id, app->bits_per_long, app->uid); | |
2851 | /* | |
2852 | * The session creation handles the creation of this global registry | |
2853 | * object. If none can be find, there is a code flow problem or a | |
2854 | * teardown race. | |
2855 | */ | |
2856 | assert(reg_uid); | |
2857 | ||
2858 | reg_chan = buffer_reg_channel_find(ua_chan->tracing_channel_id, | |
2859 | reg_uid); | |
2860 | if (!reg_chan) { | |
2861 | /* Create the buffer registry channel object. */ | |
2862 | ret = create_buffer_reg_channel(reg_uid->registry, ua_chan, ®_chan); | |
2863 | if (ret < 0) { | |
f14256d6 MD |
2864 | ERR("Error creating the UST channel \"%s\" registry instance", |
2865 | ua_chan->name); | |
7972aab2 DG |
2866 | goto error; |
2867 | } | |
2868 | assert(reg_chan); | |
2869 | ||
2870 | /* | |
2871 | * Create the buffers on the consumer side. This call populates the | |
2872 | * ust app channel object with all streams and data object. | |
2873 | */ | |
2874 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2875 | app->bits_per_long, reg_uid->registry->reg.ust); | |
2876 | if (ret < 0) { | |
f14256d6 MD |
2877 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2878 | ua_chan->name); | |
2879 | ||
07d2ae95 DG |
2880 | /* |
2881 | * Let's remove the previously created buffer registry channel so | |
2882 | * it's not visible anymore in the session registry. | |
2883 | */ | |
2884 | ust_registry_channel_del_free(reg_uid->registry->reg.ust, | |
2885 | ua_chan->tracing_channel_id); | |
2886 | buffer_reg_channel_remove(reg_uid->registry, reg_chan); | |
2887 | buffer_reg_channel_destroy(reg_chan, LTTNG_DOMAIN_UST); | |
7972aab2 DG |
2888 | goto error; |
2889 | } | |
2890 | ||
2891 | /* | |
2892 | * Setup the streams and add it to the session registry. | |
2893 | */ | |
fb45065e MD |
2894 | ret = setup_buffer_reg_channel(reg_uid->registry, |
2895 | ua_chan, reg_chan, app); | |
7972aab2 | 2896 | if (ret < 0) { |
f14256d6 MD |
2897 | ERR("Error setting up UST channel \"%s\"", |
2898 | ua_chan->name); | |
7972aab2 DG |
2899 | goto error; |
2900 | } | |
2901 | ||
2902 | } | |
2903 | ||
2904 | /* Send buffers to the application. */ | |
2905 | ret = send_channel_uid_to_ust(reg_chan, app, ua_sess, ua_chan); | |
9730260e | 2906 | if (ret < 0) { |
a7169585 MD |
2907 | if (ret != -ENOTCONN) { |
2908 | ERR("Error sending channel to application"); | |
2909 | } | |
9730260e DG |
2910 | goto error; |
2911 | } | |
2912 | ||
9730260e DG |
2913 | error: |
2914 | return ret; | |
2915 | } | |
2916 | ||
78f0bacd | 2917 | /* |
7972aab2 DG |
2918 | * Create and send to the application the created buffers with per PID buffers. |
2919 | * | |
2920 | * Return 0 on success else a negative value. | |
78f0bacd | 2921 | */ |
7972aab2 DG |
2922 | static int create_channel_per_pid(struct ust_app *app, |
2923 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2924 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2925 | { |
8535a6d9 | 2926 | int ret; |
7972aab2 | 2927 | struct ust_registry_session *registry; |
78f0bacd | 2928 | |
7972aab2 DG |
2929 | assert(app); |
2930 | assert(usess); | |
2931 | assert(ua_sess); | |
2932 | assert(ua_chan); | |
2933 | ||
2934 | DBG("UST app creating channel %s with per PID buffers", ua_chan->name); | |
2935 | ||
2936 | rcu_read_lock(); | |
2937 | ||
2938 | registry = get_session_registry(ua_sess); | |
2939 | assert(registry); | |
2940 | ||
2941 | /* Create and add a new channel registry to session. */ | |
2942 | ret = ust_registry_channel_add(registry, ua_chan->key); | |
78f0bacd | 2943 | if (ret < 0) { |
f14256d6 MD |
2944 | ERR("Error creating the UST channel \"%s\" registry instance", |
2945 | ua_chan->name); | |
78f0bacd DG |
2946 | goto error; |
2947 | } | |
2948 | ||
7972aab2 DG |
2949 | /* Create and get channel on the consumer side. */ |
2950 | ret = do_consumer_create_channel(usess, ua_sess, ua_chan, | |
2951 | app->bits_per_long, registry); | |
2952 | if (ret < 0) { | |
f14256d6 MD |
2953 | ERR("Error creating UST channel \"%s\" on the consumer daemon", |
2954 | ua_chan->name); | |
7972aab2 DG |
2955 | goto error; |
2956 | } | |
2957 | ||
2958 | ret = send_channel_pid_to_ust(app, ua_sess, ua_chan); | |
2959 | if (ret < 0) { | |
a7169585 MD |
2960 | if (ret != -ENOTCONN) { |
2961 | ERR("Error sending channel to application"); | |
2962 | } | |
7972aab2 DG |
2963 | goto error; |
2964 | } | |
8535a6d9 | 2965 | |
78f0bacd | 2966 | error: |
7972aab2 | 2967 | rcu_read_unlock(); |
78f0bacd DG |
2968 | return ret; |
2969 | } | |
2970 | ||
2971 | /* | |
7972aab2 DG |
2972 | * From an already allocated ust app channel, create the channel buffers if |
2973 | * need and send it to the application. This MUST be called with a RCU read | |
2974 | * side lock acquired. | |
2975 | * | |
a7169585 MD |
2976 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
2977 | * the application exited concurrently. | |
78f0bacd | 2978 | */ |
7972aab2 DG |
2979 | static int do_create_channel(struct ust_app *app, |
2980 | struct ltt_ust_session *usess, struct ust_app_session *ua_sess, | |
2981 | struct ust_app_channel *ua_chan) | |
78f0bacd | 2982 | { |
7972aab2 | 2983 | int ret; |
78f0bacd | 2984 | |
7972aab2 DG |
2985 | assert(app); |
2986 | assert(usess); | |
2987 | assert(ua_sess); | |
2988 | assert(ua_chan); | |
2989 | ||
2990 | /* Handle buffer type before sending the channel to the application. */ | |
2991 | switch (usess->buffer_type) { | |
2992 | case LTTNG_BUFFER_PER_UID: | |
2993 | { | |
2994 | ret = create_channel_per_uid(app, usess, ua_sess, ua_chan); | |
2995 | if (ret < 0) { | |
2996 | goto error; | |
2997 | } | |
2998 | break; | |
2999 | } | |
3000 | case LTTNG_BUFFER_PER_PID: | |
3001 | { | |
3002 | ret = create_channel_per_pid(app, usess, ua_sess, ua_chan); | |
3003 | if (ret < 0) { | |
3004 | goto error; | |
3005 | } | |
3006 | break; | |
3007 | } | |
3008 | default: | |
3009 | assert(0); | |
3010 | ret = -EINVAL; | |
78f0bacd DG |
3011 | goto error; |
3012 | } | |
3013 | ||
7972aab2 DG |
3014 | /* Initialize ust objd object using the received handle and add it. */ |
3015 | lttng_ht_node_init_ulong(&ua_chan->ust_objd_node, ua_chan->handle); | |
3016 | lttng_ht_add_unique_ulong(app->ust_objd, &ua_chan->ust_objd_node); | |
78f0bacd | 3017 | |
7972aab2 DG |
3018 | /* If channel is not enabled, disable it on the tracer */ |
3019 | if (!ua_chan->enabled) { | |
3020 | ret = disable_ust_channel(app, ua_sess, ua_chan); | |
3021 | if (ret < 0) { | |
3022 | goto error; | |
3023 | } | |
78f0bacd DG |
3024 | } |
3025 | ||
3026 | error: | |
3027 | return ret; | |
3028 | } | |
3029 | ||
284d8f55 | 3030 | /* |
4d710ac2 DG |
3031 | * Create UST app channel and create it on the tracer. Set ua_chanp of the |
3032 | * newly created channel if not NULL. | |
d0b96690 | 3033 | * |
36b588ed | 3034 | * Called with UST app session lock and RCU read-side lock held. |
7972aab2 | 3035 | * |
a7169585 MD |
3036 | * Return 0 on success or else a negative value. Returns -ENOTCONN if |
3037 | * the application exited concurrently. | |
284d8f55 | 3038 | */ |
4d710ac2 DG |
3039 | static int create_ust_app_channel(struct ust_app_session *ua_sess, |
3040 | struct ltt_ust_channel *uchan, struct ust_app *app, | |
7972aab2 | 3041 | enum lttng_ust_chan_type type, struct ltt_ust_session *usess, |
4d710ac2 | 3042 | struct ust_app_channel **ua_chanp) |
5b4a0ec0 DG |
3043 | { |
3044 | int ret = 0; | |
bec39940 DG |
3045 | struct lttng_ht_iter iter; |
3046 | struct lttng_ht_node_str *ua_chan_node; | |
5b4a0ec0 DG |
3047 | struct ust_app_channel *ua_chan; |
3048 | ||
3049 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
3050 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
3051 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
fc34caaa | 3052 | if (ua_chan_node != NULL) { |
5b4a0ec0 | 3053 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
fc34caaa | 3054 | goto end; |
5b4a0ec0 DG |
3055 | } |
3056 | ||
d0b96690 | 3057 | ua_chan = alloc_ust_app_channel(uchan->name, ua_sess, &uchan->attr); |
fc34caaa DG |
3058 | if (ua_chan == NULL) { |
3059 | /* Only malloc can fail here */ | |
4d710ac2 | 3060 | ret = -ENOMEM; |
094d1690 | 3061 | goto error_alloc; |
fc34caaa DG |
3062 | } |
3063 | shadow_copy_channel(ua_chan, uchan); | |
3064 | ||
ffe60014 DG |
3065 | /* Set channel type. */ |
3066 | ua_chan->attr.type = type; | |
3067 | ||
7972aab2 | 3068 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
5b4a0ec0 DG |
3069 | if (ret < 0) { |
3070 | goto error; | |
3071 | } | |
3072 | ||
fc34caaa | 3073 | DBG2("UST app create channel %s for PID %d completed", ua_chan->name, |
852d0037 | 3074 | app->pid); |
fc34caaa | 3075 | |
d0b96690 DG |
3076 | /* Only add the channel if successful on the tracer side. */ |
3077 | lttng_ht_add_unique_str(ua_sess->channels, &ua_chan->node); | |
3078 | ||
fc34caaa | 3079 | end: |
4d710ac2 DG |
3080 | if (ua_chanp) { |
3081 | *ua_chanp = ua_chan; | |
3082 | } | |
3083 | ||
3084 | /* Everything went well. */ | |
3085 | return 0; | |
5b4a0ec0 DG |
3086 | |
3087 | error: | |
d0b96690 | 3088 | delete_ust_app_channel(ua_chan->is_sent ? app->sock : -1, ua_chan, app); |
094d1690 | 3089 | error_alloc: |
4d710ac2 | 3090 | return ret; |
5b4a0ec0 DG |
3091 | } |
3092 | ||
3093 | /* | |
3094 | * Create UST app event and create it on the tracer side. | |
d0b96690 DG |
3095 | * |
3096 | * Called with ust app session mutex held. | |
5b4a0ec0 | 3097 | */ |
edb67388 DG |
3098 | static |
3099 | int create_ust_app_event(struct ust_app_session *ua_sess, | |
3100 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, | |
3101 | struct ust_app *app) | |
284d8f55 | 3102 | { |
edb67388 | 3103 | int ret = 0; |
5b4a0ec0 | 3104 | struct ust_app_event *ua_event; |
284d8f55 | 3105 | |
5b4a0ec0 | 3106 | /* Get event node */ |
18eace3b | 3107 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 3108 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 3109 | if (ua_event != NULL) { |
fc34caaa | 3110 | ret = -EEXIST; |
edb67388 DG |
3111 | goto end; |
3112 | } | |
5b4a0ec0 | 3113 | |
edb67388 DG |
3114 | /* Does not exist so create one */ |
3115 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); | |
3116 | if (ua_event == NULL) { | |
3117 | /* Only malloc can failed so something is really wrong */ | |
3118 | ret = -ENOMEM; | |
fc34caaa | 3119 | goto end; |
5b4a0ec0 | 3120 | } |
edb67388 | 3121 | shadow_copy_event(ua_event, uevent); |
5b4a0ec0 | 3122 | |
edb67388 | 3123 | /* Create it on the tracer side */ |
5b4a0ec0 | 3124 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
284d8f55 | 3125 | if (ret < 0) { |
fc34caaa | 3126 | /* Not found previously means that it does not exist on the tracer */ |
76f66f63 | 3127 | assert(ret != -LTTNG_UST_ERR_EXIST); |
284d8f55 DG |
3128 | goto error; |
3129 | } | |
3130 | ||
d0b96690 | 3131 | add_unique_ust_app_event(ua_chan, ua_event); |
284d8f55 | 3132 | |
fc34caaa | 3133 | DBG2("UST app create event %s for PID %d completed", ua_event->name, |
852d0037 | 3134 | app->pid); |
7f79d3a1 | 3135 | |
edb67388 | 3136 | end: |
fc34caaa DG |
3137 | return ret; |
3138 | ||
5b4a0ec0 | 3139 | error: |
fc34caaa | 3140 | /* Valid. Calling here is already in a read side lock */ |
fb45065e | 3141 | delete_ust_app_event(-1, ua_event, app); |
edb67388 | 3142 | return ret; |
5b4a0ec0 DG |
3143 | } |
3144 | ||
3145 | /* | |
3146 | * Create UST metadata and open it on the tracer side. | |
d0b96690 | 3147 | * |
7972aab2 | 3148 | * Called with UST app session lock held and RCU read side lock. |
5b4a0ec0 DG |
3149 | */ |
3150 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, | |
ad7a9107 | 3151 | struct ust_app *app, struct consumer_output *consumer) |
5b4a0ec0 DG |
3152 | { |
3153 | int ret = 0; | |
ffe60014 | 3154 | struct ust_app_channel *metadata; |
d88aee68 | 3155 | struct consumer_socket *socket; |
7972aab2 | 3156 | struct ust_registry_session *registry; |
5b4a0ec0 | 3157 | |
ffe60014 DG |
3158 | assert(ua_sess); |
3159 | assert(app); | |
d88aee68 | 3160 | assert(consumer); |
5b4a0ec0 | 3161 | |
7972aab2 DG |
3162 | registry = get_session_registry(ua_sess); |
3163 | assert(registry); | |
3164 | ||
ce34fcd0 MD |
3165 | pthread_mutex_lock(®istry->lock); |
3166 | ||
1b532a60 DG |
3167 | /* Metadata already exists for this registry or it was closed previously */ |
3168 | if (registry->metadata_key || registry->metadata_closed) { | |
7972aab2 DG |
3169 | ret = 0; |
3170 | goto error; | |
5b4a0ec0 DG |
3171 | } |
3172 | ||
ffe60014 | 3173 | /* Allocate UST metadata */ |
d0b96690 | 3174 | metadata = alloc_ust_app_channel(DEFAULT_METADATA_NAME, ua_sess, NULL); |
ffe60014 DG |
3175 | if (!metadata) { |
3176 | /* malloc() failed */ | |
3177 | ret = -ENOMEM; | |
3178 | goto error; | |
3179 | } | |
5b4a0ec0 | 3180 | |
ad7a9107 | 3181 | memcpy(&metadata->attr, &ua_sess->metadata_attr, sizeof(metadata->attr)); |
5b4a0ec0 | 3182 | |
7972aab2 DG |
3183 | /* Need one fd for the channel. */ |
3184 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); | |
3185 | if (ret < 0) { | |
3186 | ERR("Exhausted number of available FD upon create metadata"); | |
3187 | goto error; | |
3188 | } | |
3189 | ||
4dc3dfc5 DG |
3190 | /* Get the right consumer socket for the application. */ |
3191 | socket = consumer_find_socket_by_bitness(app->bits_per_long, consumer); | |
3192 | if (!socket) { | |
3193 | ret = -EINVAL; | |
3194 | goto error_consumer; | |
3195 | } | |
3196 | ||
331744e3 JD |
3197 | /* |
3198 | * Keep metadata key so we can identify it on the consumer side. Assign it | |
3199 | * to the registry *before* we ask the consumer so we avoid the race of the | |
3200 | * consumer requesting the metadata and the ask_channel call on our side | |
3201 | * did not returned yet. | |
3202 | */ | |
3203 | registry->metadata_key = metadata->key; | |
3204 | ||
d88aee68 DG |
3205 | /* |
3206 | * Ask the metadata channel creation to the consumer. The metadata object | |
3207 | * will be created by the consumer and kept their. However, the stream is | |
3208 | * never added or monitored until we do a first push metadata to the | |
3209 | * consumer. | |
3210 | */ | |
7972aab2 DG |
3211 | ret = ust_consumer_ask_channel(ua_sess, metadata, consumer, socket, |
3212 | registry); | |
d88aee68 | 3213 | if (ret < 0) { |
f2a444f1 DG |
3214 | /* Nullify the metadata key so we don't try to close it later on. */ |
3215 | registry->metadata_key = 0; | |
d88aee68 DG |
3216 | goto error_consumer; |
3217 | } | |
3218 | ||
3219 | /* | |
3220 | * The setup command will make the metadata stream be sent to the relayd, | |
3221 | * if applicable, and the thread managing the metadatas. This is important | |
3222 | * because after this point, if an error occurs, the only way the stream | |
3223 | * can be deleted is to be monitored in the consumer. | |
3224 | */ | |
7972aab2 | 3225 | ret = consumer_setup_metadata(socket, metadata->key); |
ffe60014 | 3226 | if (ret < 0) { |
f2a444f1 DG |
3227 | /* Nullify the metadata key so we don't try to close it later on. */ |
3228 | registry->metadata_key = 0; | |
d88aee68 | 3229 | goto error_consumer; |
5b4a0ec0 DG |
3230 | } |
3231 | ||
7972aab2 DG |
3232 | DBG2("UST metadata with key %" PRIu64 " created for app pid %d", |
3233 | metadata->key, app->pid); | |
5b4a0ec0 | 3234 | |
d88aee68 | 3235 | error_consumer: |
b80f0b6c | 3236 | lttng_fd_put(LTTNG_FD_APPS, 1); |
d88aee68 | 3237 | delete_ust_app_channel(-1, metadata, app); |
5b4a0ec0 | 3238 | error: |
ce34fcd0 | 3239 | pthread_mutex_unlock(®istry->lock); |
ffe60014 | 3240 | return ret; |
5b4a0ec0 DG |
3241 | } |
3242 | ||
5b4a0ec0 | 3243 | /* |
d88aee68 DG |
3244 | * Return ust app pointer or NULL if not found. RCU read side lock MUST be |
3245 | * acquired before calling this function. | |
5b4a0ec0 DG |
3246 | */ |
3247 | struct ust_app *ust_app_find_by_pid(pid_t pid) | |
3248 | { | |
d88aee68 | 3249 | struct ust_app *app = NULL; |
bec39940 DG |
3250 | struct lttng_ht_node_ulong *node; |
3251 | struct lttng_ht_iter iter; | |
5b4a0ec0 | 3252 | |
bec39940 DG |
3253 | lttng_ht_lookup(ust_app_ht, (void *)((unsigned long) pid), &iter); |
3254 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5b4a0ec0 DG |
3255 | if (node == NULL) { |
3256 | DBG2("UST app no found with pid %d", pid); | |
3257 | goto error; | |
3258 | } | |
5b4a0ec0 DG |
3259 | |
3260 | DBG2("Found UST app by pid %d", pid); | |
3261 | ||
d88aee68 | 3262 | app = caa_container_of(node, struct ust_app, pid_n); |
5b4a0ec0 DG |
3263 | |
3264 | error: | |
d88aee68 | 3265 | return app; |
5b4a0ec0 DG |
3266 | } |
3267 | ||
d88aee68 DG |
3268 | /* |
3269 | * Allocate and init an UST app object using the registration information and | |
3270 | * the command socket. This is called when the command socket connects to the | |
3271 | * session daemon. | |
3272 | * | |
3273 | * The object is returned on success or else NULL. | |
3274 | */ | |
d0b96690 | 3275 | struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock) |
5b4a0ec0 | 3276 | { |
d0b96690 DG |
3277 | struct ust_app *lta = NULL; |
3278 | ||
3279 | assert(msg); | |
3280 | assert(sock >= 0); | |
3281 | ||
3282 | DBG3("UST app creating application for socket %d", sock); | |
5b4a0ec0 | 3283 | |
173af62f DG |
3284 | if ((msg->bits_per_long == 64 && |
3285 | (uatomic_read(&ust_consumerd64_fd) == -EINVAL)) | |
3286 | || (msg->bits_per_long == 32 && | |
3287 | (uatomic_read(&ust_consumerd32_fd) == -EINVAL))) { | |
f943b0fb | 3288 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
d0b96690 DG |
3289 | "%d-bit long, but no consumerd for this size is available.\n", |
3290 | msg->name, msg->pid, msg->bits_per_long); | |
3291 | goto error; | |
3f2c5fcc | 3292 | } |
d0b96690 | 3293 | |
5b4a0ec0 DG |
3294 | lta = zmalloc(sizeof(struct ust_app)); |
3295 | if (lta == NULL) { | |
3296 | PERROR("malloc"); | |
d0b96690 | 3297 | goto error; |
5b4a0ec0 DG |
3298 | } |
3299 | ||
3300 | lta->ppid = msg->ppid; | |
3301 | lta->uid = msg->uid; | |
3302 | lta->gid = msg->gid; | |
d0b96690 | 3303 | |
7753dea8 | 3304 | lta->bits_per_long = msg->bits_per_long; |
d0b96690 DG |
3305 | lta->uint8_t_alignment = msg->uint8_t_alignment; |
3306 | lta->uint16_t_alignment = msg->uint16_t_alignment; | |
3307 | lta->uint32_t_alignment = msg->uint32_t_alignment; | |
3308 | lta->uint64_t_alignment = msg->uint64_t_alignment; | |
3309 | lta->long_alignment = msg->long_alignment; | |
3310 | lta->byte_order = msg->byte_order; | |
3311 | ||
5b4a0ec0 DG |
3312 | lta->v_major = msg->major; |
3313 | lta->v_minor = msg->minor; | |
d9bf3ca4 | 3314 | lta->sessions = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
d0b96690 | 3315 | lta->ust_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
10b56aef | 3316 | lta->ust_sessions_objd = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
d0b96690 | 3317 | lta->notify_sock = -1; |
d88aee68 DG |
3318 | |
3319 | /* Copy name and make sure it's NULL terminated. */ | |
3320 | strncpy(lta->name, msg->name, sizeof(lta->name)); | |
3321 | lta->name[UST_APP_PROCNAME_LEN] = '\0'; | |
3322 | ||
3323 | /* | |
3324 | * Before this can be called, when receiving the registration information, | |
3325 | * the application compatibility is checked. So, at this point, the | |
3326 | * application can work with this session daemon. | |
3327 | */ | |
d0b96690 | 3328 | lta->compatible = 1; |
5b4a0ec0 | 3329 | |
852d0037 | 3330 | lta->pid = msg->pid; |
d0b96690 | 3331 | lttng_ht_node_init_ulong(<a->pid_n, (unsigned long) lta->pid); |
852d0037 | 3332 | lta->sock = sock; |
fb45065e | 3333 | pthread_mutex_init(<a->sock_lock, NULL); |
d0b96690 | 3334 | lttng_ht_node_init_ulong(<a->sock_n, (unsigned long) lta->sock); |
5b4a0ec0 | 3335 | |
d42f20df | 3336 | CDS_INIT_LIST_HEAD(<a->teardown_head); |
d0b96690 DG |
3337 | error: |
3338 | return lta; | |
3339 | } | |
3340 | ||
d88aee68 DG |
3341 | /* |
3342 | * For a given application object, add it to every hash table. | |
3343 | */ | |
d0b96690 DG |
3344 | void ust_app_add(struct ust_app *app) |
3345 | { | |
3346 | assert(app); | |
3347 | assert(app->notify_sock >= 0); | |
3348 | ||
5b4a0ec0 | 3349 | rcu_read_lock(); |
852d0037 DG |
3350 | |
3351 | /* | |
3352 | * On a re-registration, we want to kick out the previous registration of | |
3353 | * that pid | |
3354 | */ | |
d0b96690 | 3355 | lttng_ht_add_replace_ulong(ust_app_ht, &app->pid_n); |
852d0037 DG |
3356 | |
3357 | /* | |
3358 | * The socket _should_ be unique until _we_ call close. So, a add_unique | |
3359 | * for the ust_app_ht_by_sock is used which asserts fail if the entry was | |
3360 | * already in the table. | |
3361 | */ | |
d0b96690 | 3362 | lttng_ht_add_unique_ulong(ust_app_ht_by_sock, &app->sock_n); |
852d0037 | 3363 | |
d0b96690 DG |
3364 | /* Add application to the notify socket hash table. */ |
3365 | lttng_ht_node_init_ulong(&app->notify_sock_n, app->notify_sock); | |
3366 | lttng_ht_add_unique_ulong(ust_app_ht_by_notify_sock, &app->notify_sock_n); | |
5b4a0ec0 | 3367 | |
d0b96690 | 3368 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s " |
d88aee68 DG |
3369 | "notify_sock:%d (version %d.%d)", app->pid, app->ppid, app->uid, |
3370 | app->gid, app->sock, app->name, app->notify_sock, app->v_major, | |
3371 | app->v_minor); | |
5b4a0ec0 | 3372 | |
d0b96690 DG |
3373 | rcu_read_unlock(); |
3374 | } | |
3375 | ||
d88aee68 DG |
3376 | /* |
3377 | * Set the application version into the object. | |
3378 | * | |
3379 | * Return 0 on success else a negative value either an errno code or a | |
3380 | * LTTng-UST error code. | |
3381 | */ | |
d0b96690 DG |
3382 | int ust_app_version(struct ust_app *app) |
3383 | { | |
d88aee68 DG |
3384 | int ret; |
3385 | ||
d0b96690 | 3386 | assert(app); |
d88aee68 | 3387 | |
fb45065e | 3388 | pthread_mutex_lock(&app->sock_lock); |
d88aee68 | 3389 | ret = ustctl_tracer_version(app->sock, &app->version); |
fb45065e | 3390 | pthread_mutex_unlock(&app->sock_lock); |
d88aee68 DG |
3391 | if (ret < 0) { |
3392 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { | |
5368d366 | 3393 | ERR("UST app %d version failed with ret %d", app->sock, ret); |
d88aee68 | 3394 | } else { |
5368d366 | 3395 | DBG3("UST app %d version failed. Application is dead", app->sock); |
d88aee68 DG |
3396 | } |
3397 | } | |
3398 | ||
3399 | return ret; | |
5b4a0ec0 DG |
3400 | } |
3401 | ||
3402 | /* | |
3403 | * Unregister app by removing it from the global traceable app list and freeing | |
3404 | * the data struct. | |
3405 | * | |
3406 | * The socket is already closed at this point so no close to sock. | |
3407 | */ | |
3408 | void ust_app_unregister(int sock) | |
3409 | { | |
3410 | struct ust_app *lta; | |
bec39940 | 3411 | struct lttng_ht_node_ulong *node; |
c4b88406 | 3412 | struct lttng_ht_iter ust_app_sock_iter; |
bec39940 | 3413 | struct lttng_ht_iter iter; |
d42f20df | 3414 | struct ust_app_session *ua_sess; |
525b0740 | 3415 | int ret; |
5b4a0ec0 DG |
3416 | |
3417 | rcu_read_lock(); | |
886459c6 | 3418 | |
5b4a0ec0 | 3419 | /* Get the node reference for a call_rcu */ |
c4b88406 MD |
3420 | lttng_ht_lookup(ust_app_ht_by_sock, (void *)((unsigned long) sock), &ust_app_sock_iter); |
3421 | node = lttng_ht_iter_get_node_ulong(&ust_app_sock_iter); | |
d0b96690 | 3422 | assert(node); |
284d8f55 | 3423 | |
852d0037 | 3424 | lta = caa_container_of(node, struct ust_app, sock_n); |
852d0037 DG |
3425 | DBG("PID %d unregistering with sock %d", lta->pid, sock); |
3426 | ||
d88aee68 | 3427 | /* |
ce34fcd0 MD |
3428 | * For per-PID buffers, perform "push metadata" and flush all |
3429 | * application streams before removing app from hash tables, | |
3430 | * ensuring proper behavior of data_pending check. | |
c4b88406 | 3431 | * Remove sessions so they are not visible during deletion. |
d88aee68 | 3432 | */ |
d42f20df DG |
3433 | cds_lfht_for_each_entry(lta->sessions->ht, &iter.iter, ua_sess, |
3434 | node.node) { | |
7972aab2 DG |
3435 | struct ust_registry_session *registry; |
3436 | ||
d42f20df DG |
3437 | ret = lttng_ht_del(lta->sessions, &iter); |
3438 | if (ret) { | |
3439 | /* The session was already removed so scheduled for teardown. */ | |
3440 | continue; | |
3441 | } | |
3442 | ||
ce34fcd0 MD |
3443 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_PID) { |
3444 | (void) ust_app_flush_app_session(lta, ua_sess); | |
3445 | } | |
c4b88406 | 3446 | |
d42f20df DG |
3447 | /* |
3448 | * Add session to list for teardown. This is safe since at this point we | |
3449 | * are the only one using this list. | |
3450 | */ | |
d88aee68 DG |
3451 | pthread_mutex_lock(&ua_sess->lock); |
3452 | ||
b161602a MD |
3453 | if (ua_sess->deleted) { |
3454 | pthread_mutex_unlock(&ua_sess->lock); | |
3455 | continue; | |
3456 | } | |
3457 | ||
d88aee68 DG |
3458 | /* |
3459 | * Normally, this is done in the delete session process which is | |
3460 | * executed in the call rcu below. However, upon registration we can't | |
3461 | * afford to wait for the grace period before pushing data or else the | |
3462 | * data pending feature can race between the unregistration and stop | |
3463 | * command where the data pending command is sent *before* the grace | |
3464 | * period ended. | |
3465 | * | |
3466 | * The close metadata below nullifies the metadata pointer in the | |
3467 | * session so the delete session will NOT push/close a second time. | |
3468 | */ | |
7972aab2 | 3469 | registry = get_session_registry(ua_sess); |
ce34fcd0 | 3470 | if (registry) { |
7972aab2 DG |
3471 | /* Push metadata for application before freeing the application. */ |
3472 | (void) push_metadata(registry, ua_sess->consumer); | |
3473 | ||
3474 | /* | |
3475 | * Don't ask to close metadata for global per UID buffers. Close | |
1b532a60 DG |
3476 | * metadata only on destroy trace session in this case. Also, the |
3477 | * previous push metadata could have flag the metadata registry to | |
3478 | * close so don't send a close command if closed. | |
7972aab2 | 3479 | */ |
ce34fcd0 | 3480 | if (ua_sess->buffer_type != LTTNG_BUFFER_PER_UID) { |
7972aab2 DG |
3481 | /* And ask to close it for this session registry. */ |
3482 | (void) close_metadata(registry, ua_sess->consumer); | |
3483 | } | |
3484 | } | |
d42f20df | 3485 | cds_list_add(&ua_sess->teardown_node, <a->teardown_head); |
c4b88406 | 3486 | |
d88aee68 | 3487 | pthread_mutex_unlock(&ua_sess->lock); |
d42f20df DG |
3488 | } |
3489 | ||
c4b88406 MD |
3490 | /* Remove application from PID hash table */ |
3491 | ret = lttng_ht_del(ust_app_ht_by_sock, &ust_app_sock_iter); | |
3492 | assert(!ret); | |
3493 | ||
3494 | /* | |
3495 | * Remove application from notify hash table. The thread handling the | |
3496 | * notify socket could have deleted the node so ignore on error because | |
3497 | * either way it's valid. The close of that socket is handled by the other | |
3498 | * thread. | |
3499 | */ | |
3500 | iter.iter.node = <a->notify_sock_n.node; | |
3501 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3502 | ||
3503 | /* | |
3504 | * Ignore return value since the node might have been removed before by an | |
3505 | * add replace during app registration because the PID can be reassigned by | |
3506 | * the OS. | |
3507 | */ | |
3508 | iter.iter.node = <a->pid_n.node; | |
3509 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3510 | if (ret) { | |
3511 | DBG3("Unregister app by PID %d failed. This can happen on pid reuse", | |
3512 | lta->pid); | |
3513 | } | |
3514 | ||
852d0037 DG |
3515 | /* Free memory */ |
3516 | call_rcu(<a->pid_n.head, delete_ust_app_rcu); | |
3517 | ||
5b4a0ec0 DG |
3518 | rcu_read_unlock(); |
3519 | return; | |
284d8f55 DG |
3520 | } |
3521 | ||
5b4a0ec0 DG |
3522 | /* |
3523 | * Fill events array with all events name of all registered apps. | |
3524 | */ | |
3525 | int ust_app_list_events(struct lttng_event **events) | |
421cb601 | 3526 | { |
5b4a0ec0 DG |
3527 | int ret, handle; |
3528 | size_t nbmem, count = 0; | |
bec39940 | 3529 | struct lttng_ht_iter iter; |
5b4a0ec0 | 3530 | struct ust_app *app; |
c617c0c6 | 3531 | struct lttng_event *tmp_event; |
421cb601 | 3532 | |
5b4a0ec0 | 3533 | nbmem = UST_APP_EVENT_LIST_SIZE; |
c617c0c6 MD |
3534 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event)); |
3535 | if (tmp_event == NULL) { | |
5b4a0ec0 DG |
3536 | PERROR("zmalloc ust app events"); |
3537 | ret = -ENOMEM; | |
421cb601 DG |
3538 | goto error; |
3539 | } | |
3540 | ||
5b4a0ec0 | 3541 | rcu_read_lock(); |
421cb601 | 3542 | |
852d0037 | 3543 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
90eaa0d2 | 3544 | struct lttng_ust_tracepoint_iter uiter; |
ac3bd9c0 | 3545 | |
840cb59c | 3546 | health_code_update(); |
86acf0da | 3547 | |
e0c7ec2b DG |
3548 | if (!app->compatible) { |
3549 | /* | |
3550 | * TODO: In time, we should notice the caller of this error by | |
3551 | * telling him that this is a version error. | |
3552 | */ | |
3553 | continue; | |
3554 | } | |
fb45065e | 3555 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 3556 | handle = ustctl_tracepoint_list(app->sock); |
5b4a0ec0 | 3557 | if (handle < 0) { |
ffe60014 DG |
3558 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3559 | ERR("UST app list events getting handle failed for app pid %d", | |
3560 | app->pid); | |
3561 | } | |
fb45065e | 3562 | pthread_mutex_unlock(&app->sock_lock); |
5b4a0ec0 DG |
3563 | continue; |
3564 | } | |
421cb601 | 3565 | |
852d0037 | 3566 | while ((ret = ustctl_tracepoint_list_get(app->sock, handle, |
fb54cdbf | 3567 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3568 | /* Handle ustctl error. */ |
3569 | if (ret < 0) { | |
fb45065e MD |
3570 | int release_ret; |
3571 | ||
a2ba1ab0 | 3572 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3573 | ERR("UST app tp list get failed for app %d with ret %d", |
3574 | app->sock, ret); | |
3575 | } else { | |
3576 | DBG3("UST app tp list get failed. Application is dead"); | |
3757b385 DG |
3577 | /* |
3578 | * This is normal behavior, an application can die during the | |
3579 | * creation process. Don't report an error so the execution can | |
3580 | * continue normally. Continue normal execution. | |
3581 | */ | |
3582 | break; | |
ffe60014 | 3583 | } |
98f595d4 | 3584 | free(tmp_event); |
fb45065e | 3585 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3586 | if (release_ret < 0 && |
3587 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3588 | release_ret != -EPIPE) { | |
fb45065e MD |
3589 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3590 | } | |
3591 | pthread_mutex_unlock(&app->sock_lock); | |
ffe60014 DG |
3592 | goto rcu_error; |
3593 | } | |
3594 | ||
840cb59c | 3595 | health_code_update(); |
815564d8 | 3596 | if (count >= nbmem) { |
d7b3776f | 3597 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3598 | struct lttng_event *new_tmp_event; |
3599 | size_t new_nbmem; | |
3600 | ||
3601 | new_nbmem = nbmem << 1; | |
3602 | DBG2("Reallocating event list from %zu to %zu entries", | |
3603 | nbmem, new_nbmem); | |
3604 | new_tmp_event = realloc(tmp_event, | |
3605 | new_nbmem * sizeof(struct lttng_event)); | |
3606 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3607 | int release_ret; |
3608 | ||
5b4a0ec0 | 3609 | PERROR("realloc ust app events"); |
c617c0c6 | 3610 | free(tmp_event); |
5b4a0ec0 | 3611 | ret = -ENOMEM; |
fb45065e | 3612 | release_ret = ustctl_release_handle(app->sock, handle); |
68313703 JG |
3613 | if (release_ret < 0 && |
3614 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3615 | release_ret != -EPIPE) { | |
fb45065e MD |
3616 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3617 | } | |
3618 | pthread_mutex_unlock(&app->sock_lock); | |
5b4a0ec0 DG |
3619 | goto rcu_error; |
3620 | } | |
53efb85a MD |
3621 | /* Zero the new memory */ |
3622 | memset(new_tmp_event + nbmem, 0, | |
3623 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); | |
3624 | nbmem = new_nbmem; | |
3625 | tmp_event = new_tmp_event; | |
5b4a0ec0 | 3626 | } |
c617c0c6 MD |
3627 | memcpy(tmp_event[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN); |
3628 | tmp_event[count].loglevel = uiter.loglevel; | |
3629 | tmp_event[count].type = (enum lttng_event_type) LTTNG_UST_TRACEPOINT; | |
3630 | tmp_event[count].pid = app->pid; | |
3631 | tmp_event[count].enabled = -1; | |
5b4a0ec0 | 3632 | count++; |
421cb601 | 3633 | } |
fb45065e MD |
3634 | ret = ustctl_release_handle(app->sock, handle); |
3635 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 | 3636 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
fb45065e MD |
3637 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3638 | } | |
421cb601 DG |
3639 | } |
3640 | ||
5b4a0ec0 | 3641 | ret = count; |
c617c0c6 | 3642 | *events = tmp_event; |
421cb601 | 3643 | |
5b4a0ec0 | 3644 | DBG2("UST app list events done (%zu events)", count); |
421cb601 | 3645 | |
5b4a0ec0 DG |
3646 | rcu_error: |
3647 | rcu_read_unlock(); | |
421cb601 | 3648 | error: |
840cb59c | 3649 | health_code_update(); |
5b4a0ec0 | 3650 | return ret; |
421cb601 DG |
3651 | } |
3652 | ||
f37d259d MD |
3653 | /* |
3654 | * Fill events array with all events name of all registered apps. | |
3655 | */ | |
3656 | int ust_app_list_event_fields(struct lttng_event_field **fields) | |
3657 | { | |
3658 | int ret, handle; | |
3659 | size_t nbmem, count = 0; | |
3660 | struct lttng_ht_iter iter; | |
3661 | struct ust_app *app; | |
c617c0c6 | 3662 | struct lttng_event_field *tmp_event; |
f37d259d MD |
3663 | |
3664 | nbmem = UST_APP_EVENT_LIST_SIZE; | |
c617c0c6 MD |
3665 | tmp_event = zmalloc(nbmem * sizeof(struct lttng_event_field)); |
3666 | if (tmp_event == NULL) { | |
f37d259d MD |
3667 | PERROR("zmalloc ust app event fields"); |
3668 | ret = -ENOMEM; | |
3669 | goto error; | |
3670 | } | |
3671 | ||
3672 | rcu_read_lock(); | |
3673 | ||
3674 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3675 | struct lttng_ust_field_iter uiter; | |
3676 | ||
840cb59c | 3677 | health_code_update(); |
86acf0da | 3678 | |
f37d259d MD |
3679 | if (!app->compatible) { |
3680 | /* | |
3681 | * TODO: In time, we should notice the caller of this error by | |
3682 | * telling him that this is a version error. | |
3683 | */ | |
3684 | continue; | |
3685 | } | |
fb45065e | 3686 | pthread_mutex_lock(&app->sock_lock); |
f37d259d MD |
3687 | handle = ustctl_tracepoint_field_list(app->sock); |
3688 | if (handle < 0) { | |
ffe60014 DG |
3689 | if (handle != -EPIPE && handle != -LTTNG_UST_ERR_EXITING) { |
3690 | ERR("UST app list field getting handle failed for app pid %d", | |
3691 | app->pid); | |
3692 | } | |
fb45065e | 3693 | pthread_mutex_unlock(&app->sock_lock); |
f37d259d MD |
3694 | continue; |
3695 | } | |
3696 | ||
3697 | while ((ret = ustctl_tracepoint_field_list_get(app->sock, handle, | |
fb54cdbf | 3698 | &uiter)) != -LTTNG_UST_ERR_NOENT) { |
ffe60014 DG |
3699 | /* Handle ustctl error. */ |
3700 | if (ret < 0) { | |
fb45065e MD |
3701 | int release_ret; |
3702 | ||
a2ba1ab0 | 3703 | if (ret != -LTTNG_UST_ERR_EXITING && ret != -EPIPE) { |
ffe60014 DG |
3704 | ERR("UST app tp list field failed for app %d with ret %d", |
3705 | app->sock, ret); | |
3706 | } else { | |
3707 | DBG3("UST app tp list field failed. Application is dead"); | |
3757b385 DG |
3708 | /* |
3709 | * This is normal behavior, an application can die during the | |
3710 | * creation process. Don't report an error so the execution can | |
98f595d4 | 3711 | * continue normally. Reset list and count for next app. |
3757b385 DG |
3712 | */ |
3713 | break; | |
ffe60014 | 3714 | } |
98f595d4 | 3715 | free(tmp_event); |
fb45065e MD |
3716 | release_ret = ustctl_release_handle(app->sock, handle); |
3717 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3718 | if (release_ret < 0 && |
3719 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3720 | release_ret != -EPIPE) { | |
fb45065e MD |
3721 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3722 | } | |
ffe60014 DG |
3723 | goto rcu_error; |
3724 | } | |
3725 | ||
840cb59c | 3726 | health_code_update(); |
f37d259d | 3727 | if (count >= nbmem) { |
d7b3776f | 3728 | /* In case the realloc fails, we free the memory */ |
53efb85a MD |
3729 | struct lttng_event_field *new_tmp_event; |
3730 | size_t new_nbmem; | |
3731 | ||
3732 | new_nbmem = nbmem << 1; | |
3733 | DBG2("Reallocating event field list from %zu to %zu entries", | |
3734 | nbmem, new_nbmem); | |
3735 | new_tmp_event = realloc(tmp_event, | |
3736 | new_nbmem * sizeof(struct lttng_event_field)); | |
3737 | if (new_tmp_event == NULL) { | |
fb45065e MD |
3738 | int release_ret; |
3739 | ||
f37d259d | 3740 | PERROR("realloc ust app event fields"); |
c617c0c6 | 3741 | free(tmp_event); |
f37d259d | 3742 | ret = -ENOMEM; |
fb45065e MD |
3743 | release_ret = ustctl_release_handle(app->sock, handle); |
3744 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3745 | if (release_ret && |
3746 | release_ret != -LTTNG_UST_ERR_EXITING && | |
3747 | release_ret != -EPIPE) { | |
fb45065e MD |
3748 | ERR("Error releasing app handle for app %d with ret %d", app->sock, release_ret); |
3749 | } | |
f37d259d MD |
3750 | goto rcu_error; |
3751 | } | |
53efb85a MD |
3752 | /* Zero the new memory */ |
3753 | memset(new_tmp_event + nbmem, 0, | |
3754 | (new_nbmem - nbmem) * sizeof(struct lttng_event_field)); | |
3755 | nbmem = new_nbmem; | |
3756 | tmp_event = new_tmp_event; | |
f37d259d | 3757 | } |
f37d259d | 3758 | |
c617c0c6 | 3759 | memcpy(tmp_event[count].field_name, uiter.field_name, LTTNG_UST_SYM_NAME_LEN); |
2e84128e DG |
3760 | /* Mapping between these enums matches 1 to 1. */ |
3761 | tmp_event[count].type = (enum lttng_event_field_type) uiter.type; | |
c617c0c6 | 3762 | tmp_event[count].nowrite = uiter.nowrite; |
f37d259d | 3763 | |
c617c0c6 MD |
3764 | memcpy(tmp_event[count].event.name, uiter.event_name, LTTNG_UST_SYM_NAME_LEN); |
3765 | tmp_event[count].event.loglevel = uiter.loglevel; | |
2e84128e | 3766 | tmp_event[count].event.type = LTTNG_EVENT_TRACEPOINT; |
c617c0c6 MD |
3767 | tmp_event[count].event.pid = app->pid; |
3768 | tmp_event[count].event.enabled = -1; | |
f37d259d MD |
3769 | count++; |
3770 | } | |
fb45065e MD |
3771 | ret = ustctl_release_handle(app->sock, handle); |
3772 | pthread_mutex_unlock(&app->sock_lock); | |
68313703 JG |
3773 | if (ret < 0 && |
3774 | ret != -LTTNG_UST_ERR_EXITING && | |
3775 | ret != -EPIPE) { | |
fb45065e MD |
3776 | ERR("Error releasing app handle for app %d with ret %d", app->sock, ret); |
3777 | } | |
f37d259d MD |
3778 | } |
3779 | ||
3780 | ret = count; | |
c617c0c6 | 3781 | *fields = tmp_event; |
f37d259d MD |
3782 | |
3783 | DBG2("UST app list event fields done (%zu events)", count); | |
3784 | ||
3785 | rcu_error: | |
3786 | rcu_read_unlock(); | |
3787 | error: | |
840cb59c | 3788 | health_code_update(); |
f37d259d MD |
3789 | return ret; |
3790 | } | |
3791 | ||
5b4a0ec0 DG |
3792 | /* |
3793 | * Free and clean all traceable apps of the global list. | |
36b588ed MD |
3794 | * |
3795 | * Should _NOT_ be called with RCU read-side lock held. | |
5b4a0ec0 DG |
3796 | */ |
3797 | void ust_app_clean_list(void) | |
421cb601 | 3798 | { |
5b4a0ec0 | 3799 | int ret; |
659ed79f | 3800 | struct ust_app *app; |
bec39940 | 3801 | struct lttng_ht_iter iter; |
421cb601 | 3802 | |
5b4a0ec0 | 3803 | DBG2("UST app cleaning registered apps hash table"); |
421cb601 | 3804 | |
5b4a0ec0 | 3805 | rcu_read_lock(); |
421cb601 | 3806 | |
f1b711c4 MD |
3807 | if (ust_app_ht) { |
3808 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
3809 | ret = lttng_ht_del(ust_app_ht, &iter); | |
3810 | assert(!ret); | |
3811 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
3812 | } | |
421cb601 DG |
3813 | } |
3814 | ||
852d0037 | 3815 | /* Cleanup socket hash table */ |
f1b711c4 MD |
3816 | if (ust_app_ht_by_sock) { |
3817 | cds_lfht_for_each_entry(ust_app_ht_by_sock->ht, &iter.iter, app, | |
3818 | sock_n.node) { | |
3819 | ret = lttng_ht_del(ust_app_ht_by_sock, &iter); | |
3820 | assert(!ret); | |
3821 | } | |
bec39940 | 3822 | } |
852d0037 | 3823 | |
d88aee68 | 3824 | /* Cleanup notify socket hash table */ |
f1b711c4 MD |
3825 | if (ust_app_ht_by_notify_sock) { |
3826 | cds_lfht_for_each_entry(ust_app_ht_by_notify_sock->ht, &iter.iter, app, | |
3827 | notify_sock_n.node) { | |
3828 | ret = lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
3829 | assert(!ret); | |
3830 | } | |
d88aee68 | 3831 | } |
36b588ed | 3832 | rcu_read_unlock(); |
d88aee68 | 3833 | |
bec39940 | 3834 | /* Destroy is done only when the ht is empty */ |
f1b711c4 MD |
3835 | if (ust_app_ht) { |
3836 | ht_cleanup_push(ust_app_ht); | |
3837 | } | |
3838 | if (ust_app_ht_by_sock) { | |
3839 | ht_cleanup_push(ust_app_ht_by_sock); | |
3840 | } | |
3841 | if (ust_app_ht_by_notify_sock) { | |
3842 | ht_cleanup_push(ust_app_ht_by_notify_sock); | |
3843 | } | |
5b4a0ec0 DG |
3844 | } |
3845 | ||
3846 | /* | |
3847 | * Init UST app hash table. | |
3848 | */ | |
57703f6e | 3849 | int ust_app_ht_alloc(void) |
5b4a0ec0 | 3850 | { |
bec39940 | 3851 | ust_app_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3852 | if (!ust_app_ht) { |
3853 | return -1; | |
3854 | } | |
852d0037 | 3855 | ust_app_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3856 | if (!ust_app_ht_by_sock) { |
3857 | return -1; | |
3858 | } | |
d0b96690 | 3859 | ust_app_ht_by_notify_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
57703f6e MD |
3860 | if (!ust_app_ht_by_notify_sock) { |
3861 | return -1; | |
3862 | } | |
3863 | return 0; | |
421cb601 DG |
3864 | } |
3865 | ||
78f0bacd DG |
3866 | /* |
3867 | * For a specific UST session, disable the channel for all registered apps. | |
3868 | */ | |
35a9059d | 3869 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3870 | struct ltt_ust_channel *uchan) |
3871 | { | |
3872 | int ret = 0; | |
bec39940 DG |
3873 | struct lttng_ht_iter iter; |
3874 | struct lttng_ht_node_str *ua_chan_node; | |
78f0bacd DG |
3875 | struct ust_app *app; |
3876 | struct ust_app_session *ua_sess; | |
8535a6d9 | 3877 | struct ust_app_channel *ua_chan; |
78f0bacd DG |
3878 | |
3879 | if (usess == NULL || uchan == NULL) { | |
3880 | ERR("Disabling UST global channel with NULL values"); | |
3881 | ret = -1; | |
3882 | goto error; | |
3883 | } | |
3884 | ||
d9bf3ca4 | 3885 | DBG2("UST app disabling channel %s from global domain for session id %" PRIu64, |
a991f516 | 3886 | uchan->name, usess->id); |
78f0bacd DG |
3887 | |
3888 | rcu_read_lock(); | |
3889 | ||
3890 | /* For every registered applications */ | |
852d0037 | 3891 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
bec39940 | 3892 | struct lttng_ht_iter uiter; |
e0c7ec2b DG |
3893 | if (!app->compatible) { |
3894 | /* | |
3895 | * TODO: In time, we should notice the caller of this error by | |
3896 | * telling him that this is a version error. | |
3897 | */ | |
3898 | continue; | |
3899 | } | |
78f0bacd DG |
3900 | ua_sess = lookup_session_by_app(usess, app); |
3901 | if (ua_sess == NULL) { | |
3902 | continue; | |
3903 | } | |
3904 | ||
8535a6d9 | 3905 | /* Get channel */ |
bec39940 DG |
3906 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
3907 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
8535a6d9 DG |
3908 | /* If the session if found for the app, the channel must be there */ |
3909 | assert(ua_chan_node); | |
3910 | ||
3911 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
3912 | /* The channel must not be already disabled */ | |
3913 | assert(ua_chan->enabled == 1); | |
3914 | ||
3915 | /* Disable channel onto application */ | |
3916 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); | |
78f0bacd DG |
3917 | if (ret < 0) { |
3918 | /* XXX: We might want to report this error at some point... */ | |
3919 | continue; | |
3920 | } | |
3921 | } | |
3922 | ||
3923 | rcu_read_unlock(); | |
3924 | ||
3925 | error: | |
3926 | return ret; | |
3927 | } | |
3928 | ||
3929 | /* | |
3930 | * For a specific UST session, enable the channel for all registered apps. | |
3931 | */ | |
35a9059d | 3932 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
78f0bacd DG |
3933 | struct ltt_ust_channel *uchan) |
3934 | { | |
3935 | int ret = 0; | |
bec39940 | 3936 | struct lttng_ht_iter iter; |
78f0bacd DG |
3937 | struct ust_app *app; |
3938 | struct ust_app_session *ua_sess; | |
3939 | ||
3940 | if (usess == NULL || uchan == NULL) { | |
3941 | ERR("Adding UST global channel to NULL values"); | |
3942 | ret = -1; | |
3943 | goto error; | |
3944 | } | |
3945 | ||
d9bf3ca4 | 3946 | DBG2("UST app enabling channel %s to global domain for session id %" PRIu64, |
a991f516 | 3947 | uchan->name, usess->id); |
78f0bacd DG |
3948 | |
3949 | rcu_read_lock(); | |
3950 | ||
3951 | /* For every registered applications */ | |
852d0037 | 3952 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
3953 | if (!app->compatible) { |
3954 | /* | |
3955 | * TODO: In time, we should notice the caller of this error by | |
3956 | * telling him that this is a version error. | |
3957 | */ | |
3958 | continue; | |
3959 | } | |
78f0bacd DG |
3960 | ua_sess = lookup_session_by_app(usess, app); |
3961 | if (ua_sess == NULL) { | |
3962 | continue; | |
3963 | } | |
3964 | ||
3965 | /* Enable channel onto application */ | |
3966 | ret = enable_ust_app_channel(ua_sess, uchan, app); | |
3967 | if (ret < 0) { | |
3968 | /* XXX: We might want to report this error at some point... */ | |
3969 | continue; | |
3970 | } | |
3971 | } | |
3972 | ||
3973 | rcu_read_unlock(); | |
3974 | ||
3975 | error: | |
3976 | return ret; | |
3977 | } | |
3978 | ||
b0a40d28 DG |
3979 | /* |
3980 | * Disable an event in a channel and for a specific session. | |
3981 | */ | |
35a9059d DG |
3982 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
3983 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) | |
b0a40d28 DG |
3984 | { |
3985 | int ret = 0; | |
bec39940 | 3986 | struct lttng_ht_iter iter, uiter; |
700c5a9d | 3987 | struct lttng_ht_node_str *ua_chan_node; |
b0a40d28 DG |
3988 | struct ust_app *app; |
3989 | struct ust_app_session *ua_sess; | |
3990 | struct ust_app_channel *ua_chan; | |
3991 | struct ust_app_event *ua_event; | |
3992 | ||
3993 | DBG("UST app disabling event %s for all apps in channel " | |
d9bf3ca4 MD |
3994 | "%s for session id %" PRIu64, |
3995 | uevent->attr.name, uchan->name, usess->id); | |
b0a40d28 DG |
3996 | |
3997 | rcu_read_lock(); | |
3998 | ||
3999 | /* For all registered applications */ | |
852d0037 | 4000 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4001 | if (!app->compatible) { |
4002 | /* | |
4003 | * TODO: In time, we should notice the caller of this error by | |
4004 | * telling him that this is a version error. | |
4005 | */ | |
4006 | continue; | |
4007 | } | |
b0a40d28 DG |
4008 | ua_sess = lookup_session_by_app(usess, app); |
4009 | if (ua_sess == NULL) { | |
4010 | /* Next app */ | |
4011 | continue; | |
4012 | } | |
4013 | ||
4014 | /* Lookup channel in the ust app session */ | |
bec39940 DG |
4015 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4016 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
b0a40d28 | 4017 | if (ua_chan_node == NULL) { |
d9bf3ca4 | 4018 | DBG2("Channel %s not found in session id %" PRIu64 " for app pid %d." |
852d0037 | 4019 | "Skipping", uchan->name, usess->id, app->pid); |
b0a40d28 DG |
4020 | continue; |
4021 | } | |
4022 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4023 | ||
700c5a9d JR |
4024 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
4025 | uevent->filter, uevent->attr.loglevel, | |
4026 | uevent->exclusion); | |
4027 | if (ua_event == NULL) { | |
b0a40d28 | 4028 | DBG2("Event %s not found in channel %s for app pid %d." |
852d0037 | 4029 | "Skipping", uevent->attr.name, uchan->name, app->pid); |
b0a40d28 DG |
4030 | continue; |
4031 | } | |
b0a40d28 | 4032 | |
7f79d3a1 | 4033 | ret = disable_ust_app_event(ua_sess, ua_event, app); |
b0a40d28 DG |
4034 | if (ret < 0) { |
4035 | /* XXX: Report error someday... */ | |
4036 | continue; | |
4037 | } | |
4038 | } | |
4039 | ||
4040 | rcu_read_unlock(); | |
4041 | ||
4042 | return ret; | |
4043 | } | |
4044 | ||
421cb601 | 4045 | /* |
5b4a0ec0 | 4046 | * For a specific UST session, create the channel for all registered apps. |
421cb601 | 4047 | */ |
35a9059d | 4048 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4049 | struct ltt_ust_channel *uchan) |
4050 | { | |
3d8ca23b | 4051 | int ret = 0, created; |
bec39940 | 4052 | struct lttng_ht_iter iter; |
48842b30 | 4053 | struct ust_app *app; |
3d8ca23b | 4054 | struct ust_app_session *ua_sess = NULL; |
48842b30 | 4055 | |
fc34caaa DG |
4056 | /* Very wrong code flow */ |
4057 | assert(usess); | |
4058 | assert(uchan); | |
421cb601 | 4059 | |
d9bf3ca4 | 4060 | DBG2("UST app adding channel %s to UST domain for session id %" PRIu64, |
a991f516 | 4061 | uchan->name, usess->id); |
48842b30 DG |
4062 | |
4063 | rcu_read_lock(); | |
421cb601 | 4064 | |
5b4a0ec0 | 4065 | /* For every registered applications */ |
852d0037 | 4066 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4067 | if (!app->compatible) { |
4068 | /* | |
4069 | * TODO: In time, we should notice the caller of this error by | |
4070 | * telling him that this is a version error. | |
4071 | */ | |
4072 | continue; | |
4073 | } | |
a9ad0c8f MD |
4074 | if (!trace_ust_pid_tracker_lookup(usess, app->pid)) { |
4075 | /* Skip. */ | |
4076 | continue; | |
4077 | } | |
4078 | ||
edb67388 DG |
4079 | /* |
4080 | * Create session on the tracer side and add it to app session HT. Note | |
4081 | * that if session exist, it will simply return a pointer to the ust | |
4082 | * app session. | |
4083 | */ | |
3d8ca23b DG |
4084 | ret = create_ust_app_session(usess, app, &ua_sess, &created); |
4085 | if (ret < 0) { | |
4086 | switch (ret) { | |
4087 | case -ENOTCONN: | |
4088 | /* | |
4089 | * The application's socket is not valid. Either a bad socket | |
4090 | * or a timeout on it. We can't inform the caller that for a | |
4091 | * specific app, the session failed so lets continue here. | |
4092 | */ | |
a7169585 | 4093 | ret = 0; /* Not an error. */ |
3d8ca23b DG |
4094 | continue; |
4095 | case -ENOMEM: | |
4096 | default: | |
4097 | goto error_rcu_unlock; | |
4098 | } | |
48842b30 | 4099 | } |
3d8ca23b | 4100 | assert(ua_sess); |
48842b30 | 4101 | |
d0b96690 | 4102 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4103 | |
4104 | if (ua_sess->deleted) { | |
4105 | pthread_mutex_unlock(&ua_sess->lock); | |
4106 | continue; | |
4107 | } | |
4108 | ||
d65d2de8 DG |
4109 | if (!strncmp(uchan->name, DEFAULT_METADATA_NAME, |
4110 | sizeof(uchan->name))) { | |
ad7a9107 DG |
4111 | copy_channel_attr_to_ustctl(&ua_sess->metadata_attr, &uchan->attr); |
4112 | ret = 0; | |
d65d2de8 DG |
4113 | } else { |
4114 | /* Create channel onto application. We don't need the chan ref. */ | |
4115 | ret = create_ust_app_channel(ua_sess, uchan, app, | |
4116 | LTTNG_UST_CHAN_PER_CPU, usess, NULL); | |
4117 | } | |
d0b96690 | 4118 | pthread_mutex_unlock(&ua_sess->lock); |
3d8ca23b | 4119 | if (ret < 0) { |
3d8ca23b DG |
4120 | /* Cleanup the created session if it's the case. */ |
4121 | if (created) { | |
d0b96690 | 4122 | destroy_app_session(app, ua_sess); |
3d8ca23b | 4123 | } |
a7169585 MD |
4124 | switch (ret) { |
4125 | case -ENOTCONN: | |
4126 | /* | |
4127 | * The application's socket is not valid. Either a bad socket | |
4128 | * or a timeout on it. We can't inform the caller that for a | |
4129 | * specific app, the session failed so lets continue here. | |
4130 | */ | |
4131 | ret = 0; /* Not an error. */ | |
4132 | continue; | |
4133 | case -ENOMEM: | |
4134 | default: | |
4135 | goto error_rcu_unlock; | |
4136 | } | |
48842b30 | 4137 | } |
48842b30 | 4138 | } |
5b4a0ec0 | 4139 | |
95e047ff | 4140 | error_rcu_unlock: |
48842b30 | 4141 | rcu_read_unlock(); |
3c14c33f | 4142 | return ret; |
48842b30 DG |
4143 | } |
4144 | ||
5b4a0ec0 | 4145 | /* |
edb67388 | 4146 | * Enable event for a specific session and channel on the tracer. |
5b4a0ec0 | 4147 | */ |
35a9059d | 4148 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
48842b30 DG |
4149 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4150 | { | |
4151 | int ret = 0; | |
bec39940 | 4152 | struct lttng_ht_iter iter, uiter; |
18eace3b | 4153 | struct lttng_ht_node_str *ua_chan_node; |
48842b30 DG |
4154 | struct ust_app *app; |
4155 | struct ust_app_session *ua_sess; | |
4156 | struct ust_app_channel *ua_chan; | |
4157 | struct ust_app_event *ua_event; | |
48842b30 | 4158 | |
d9bf3ca4 | 4159 | DBG("UST app enabling event %s for all apps for session id %" PRIu64, |
a991f516 | 4160 | uevent->attr.name, usess->id); |
48842b30 | 4161 | |
edb67388 DG |
4162 | /* |
4163 | * NOTE: At this point, this function is called only if the session and | |
4164 | * channel passed are already created for all apps. and enabled on the | |
4165 | * tracer also. | |
4166 | */ | |
4167 | ||
48842b30 | 4168 | rcu_read_lock(); |
421cb601 DG |
4169 | |
4170 | /* For all registered applications */ | |
852d0037 | 4171 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4172 | if (!app->compatible) { |
4173 | /* | |
4174 | * TODO: In time, we should notice the caller of this error by | |
4175 | * telling him that this is a version error. | |
4176 | */ | |
4177 | continue; | |
4178 | } | |
edb67388 | 4179 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4180 | if (!ua_sess) { |
4181 | /* The application has problem or is probably dead. */ | |
4182 | continue; | |
4183 | } | |
ba767faf | 4184 | |
d0b96690 DG |
4185 | pthread_mutex_lock(&ua_sess->lock); |
4186 | ||
b161602a MD |
4187 | if (ua_sess->deleted) { |
4188 | pthread_mutex_unlock(&ua_sess->lock); | |
4189 | continue; | |
4190 | } | |
4191 | ||
edb67388 | 4192 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4193 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4194 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
a7169585 MD |
4195 | /* |
4196 | * It is possible that the channel cannot be found is | |
4197 | * the channel/event creation occurs concurrently with | |
4198 | * an application exit. | |
4199 | */ | |
4200 | if (!ua_chan_node) { | |
4201 | pthread_mutex_unlock(&ua_sess->lock); | |
4202 | continue; | |
4203 | } | |
edb67388 DG |
4204 | |
4205 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
4206 | ||
18eace3b DG |
4207 | /* Get event node */ |
4208 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, | |
39c5a3a7 | 4209 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 4210 | if (ua_event == NULL) { |
7f79d3a1 | 4211 | DBG3("UST app enable event %s not found for app PID %d." |
852d0037 | 4212 | "Skipping app", uevent->attr.name, app->pid); |
d0b96690 | 4213 | goto next_app; |
35a9059d | 4214 | } |
35a9059d DG |
4215 | |
4216 | ret = enable_ust_app_event(ua_sess, ua_event, app); | |
4217 | if (ret < 0) { | |
d0b96690 | 4218 | pthread_mutex_unlock(&ua_sess->lock); |
7f79d3a1 | 4219 | goto error; |
48842b30 | 4220 | } |
d0b96690 DG |
4221 | next_app: |
4222 | pthread_mutex_unlock(&ua_sess->lock); | |
edb67388 DG |
4223 | } |
4224 | ||
7f79d3a1 | 4225 | error: |
edb67388 | 4226 | rcu_read_unlock(); |
edb67388 DG |
4227 | return ret; |
4228 | } | |
4229 | ||
4230 | /* | |
4231 | * For a specific existing UST session and UST channel, creates the event for | |
4232 | * all registered apps. | |
4233 | */ | |
35a9059d | 4234 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
edb67388 DG |
4235 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
4236 | { | |
4237 | int ret = 0; | |
bec39940 DG |
4238 | struct lttng_ht_iter iter, uiter; |
4239 | struct lttng_ht_node_str *ua_chan_node; | |
edb67388 DG |
4240 | struct ust_app *app; |
4241 | struct ust_app_session *ua_sess; | |
4242 | struct ust_app_channel *ua_chan; | |
4243 | ||
d9bf3ca4 | 4244 | DBG("UST app creating event %s for all apps for session id %" PRIu64, |
a991f516 | 4245 | uevent->attr.name, usess->id); |
edb67388 | 4246 | |
edb67388 DG |
4247 | rcu_read_lock(); |
4248 | ||
4249 | /* For all registered applications */ | |
852d0037 | 4250 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
4251 | if (!app->compatible) { |
4252 | /* | |
4253 | * TODO: In time, we should notice the caller of this error by | |
4254 | * telling him that this is a version error. | |
4255 | */ | |
4256 | continue; | |
4257 | } | |
edb67388 | 4258 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
4259 | if (!ua_sess) { |
4260 | /* The application has problem or is probably dead. */ | |
4261 | continue; | |
4262 | } | |
48842b30 | 4263 | |
d0b96690 | 4264 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
4265 | |
4266 | if (ua_sess->deleted) { | |
4267 | pthread_mutex_unlock(&ua_sess->lock); | |
4268 | continue; | |
4269 | } | |
4270 | ||
48842b30 | 4271 | /* Lookup channel in the ust app session */ |
bec39940 DG |
4272 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
4273 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
edb67388 DG |
4274 | /* If the channel is not found, there is a code flow error */ |
4275 | assert(ua_chan_node); | |
4276 | ||
48842b30 DG |
4277 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
4278 | ||
edb67388 | 4279 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
d0b96690 | 4280 | pthread_mutex_unlock(&ua_sess->lock); |
edb67388 | 4281 | if (ret < 0) { |
49c336c1 | 4282 | if (ret != -LTTNG_UST_ERR_EXIST) { |
fc34caaa DG |
4283 | /* Possible value at this point: -ENOMEM. If so, we stop! */ |
4284 | break; | |
4285 | } | |
4286 | DBG2("UST app event %s already exist on app PID %d", | |
852d0037 | 4287 | uevent->attr.name, app->pid); |
5b4a0ec0 | 4288 | continue; |
48842b30 | 4289 | } |
48842b30 | 4290 | } |
5b4a0ec0 | 4291 | |
48842b30 DG |
4292 | rcu_read_unlock(); |
4293 | ||
4294 | return ret; | |
4295 | } | |
4296 | ||
5b4a0ec0 DG |
4297 | /* |
4298 | * Start tracing for a specific UST session and app. | |
4299 | */ | |
b34cbebf | 4300 | static |
421cb601 | 4301 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
48842b30 DG |
4302 | { |
4303 | int ret = 0; | |
48842b30 | 4304 | struct ust_app_session *ua_sess; |
48842b30 | 4305 | |
852d0037 | 4306 | DBG("Starting tracing for ust app pid %d", app->pid); |
5cf5d0e7 | 4307 | |
509cbaf8 MD |
4308 | rcu_read_lock(); |
4309 | ||
e0c7ec2b DG |
4310 | if (!app->compatible) { |
4311 | goto end; | |
4312 | } | |
4313 | ||
421cb601 DG |
4314 | ua_sess = lookup_session_by_app(usess, app); |
4315 | if (ua_sess == NULL) { | |
d42f20df DG |
4316 | /* The session is in teardown process. Ignore and continue. */ |
4317 | goto end; | |
421cb601 | 4318 | } |
48842b30 | 4319 | |
d0b96690 DG |
4320 | pthread_mutex_lock(&ua_sess->lock); |
4321 | ||
b161602a MD |
4322 | if (ua_sess->deleted) { |
4323 | pthread_mutex_unlock(&ua_sess->lock); | |
4324 | goto end; | |
4325 | } | |
4326 | ||
aea829b3 DG |
4327 | /* Upon restart, we skip the setup, already done */ |
4328 | if (ua_sess->started) { | |
8be98f9a | 4329 | goto skip_setup; |
aea829b3 | 4330 | } |
8be98f9a | 4331 | |
a4b92340 DG |
4332 | /* Create directories if consumer is LOCAL and has a path defined. */ |
4333 | if (usess->consumer->type == CONSUMER_DST_LOCAL && | |
4334 | strlen(usess->consumer->dst.trace_path) > 0) { | |
4335 | ret = run_as_mkdir_recursive(usess->consumer->dst.trace_path, | |
7972aab2 | 4336 | S_IRWXU | S_IRWXG, ua_sess->euid, ua_sess->egid); |
a4b92340 | 4337 | if (ret < 0) { |
df5b86c8 | 4338 | if (errno != EEXIST) { |
a4b92340 | 4339 | ERR("Trace directory creation error"); |
d0b96690 | 4340 | goto error_unlock; |
421cb601 | 4341 | } |
173af62f | 4342 | } |
7753dea8 | 4343 | } |
aea829b3 | 4344 | |
d65d2de8 DG |
4345 | /* |
4346 | * Create the metadata for the application. This returns gracefully if a | |
4347 | * metadata was already set for the session. | |
4348 | */ | |
ad7a9107 | 4349 | ret = create_ust_app_metadata(ua_sess, app, usess->consumer); |
421cb601 | 4350 | if (ret < 0) { |
d0b96690 | 4351 | goto error_unlock; |
421cb601 | 4352 | } |
48842b30 | 4353 | |
840cb59c | 4354 | health_code_update(); |
86acf0da | 4355 | |
8be98f9a | 4356 | skip_setup: |
421cb601 | 4357 | /* This start the UST tracing */ |
fb45065e | 4358 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4359 | ret = ustctl_start_session(app->sock, ua_sess->handle); |
fb45065e | 4360 | pthread_mutex_unlock(&app->sock_lock); |
421cb601 | 4361 | if (ret < 0) { |
ffe60014 DG |
4362 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4363 | ERR("Error starting tracing for app pid: %d (ret: %d)", | |
4364 | app->pid, ret); | |
4365 | } else { | |
4366 | DBG("UST app start session failed. Application is dead."); | |
3757b385 DG |
4367 | /* |
4368 | * This is normal behavior, an application can die during the | |
4369 | * creation process. Don't report an error so the execution can | |
4370 | * continue normally. | |
4371 | */ | |
4372 | pthread_mutex_unlock(&ua_sess->lock); | |
4373 | goto end; | |
ffe60014 | 4374 | } |
d0b96690 | 4375 | goto error_unlock; |
421cb601 | 4376 | } |
5b4a0ec0 | 4377 | |
55c3953d DG |
4378 | /* Indicate that the session has been started once */ |
4379 | ua_sess->started = 1; | |
4380 | ||
d0b96690 DG |
4381 | pthread_mutex_unlock(&ua_sess->lock); |
4382 | ||
840cb59c | 4383 | health_code_update(); |
86acf0da | 4384 | |
421cb601 | 4385 | /* Quiescent wait after starting trace */ |
fb45065e | 4386 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4387 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4388 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4389 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4390 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4391 | app->pid, ret); | |
4392 | } | |
48842b30 | 4393 | |
e0c7ec2b DG |
4394 | end: |
4395 | rcu_read_unlock(); | |
840cb59c | 4396 | health_code_update(); |
421cb601 | 4397 | return 0; |
48842b30 | 4398 | |
d0b96690 DG |
4399 | error_unlock: |
4400 | pthread_mutex_unlock(&ua_sess->lock); | |
509cbaf8 | 4401 | rcu_read_unlock(); |
840cb59c | 4402 | health_code_update(); |
421cb601 DG |
4403 | return -1; |
4404 | } | |
48842b30 | 4405 | |
8be98f9a MD |
4406 | /* |
4407 | * Stop tracing for a specific UST session and app. | |
4408 | */ | |
b34cbebf | 4409 | static |
8be98f9a MD |
4410 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
4411 | { | |
4412 | int ret = 0; | |
4413 | struct ust_app_session *ua_sess; | |
7972aab2 | 4414 | struct ust_registry_session *registry; |
8be98f9a | 4415 | |
852d0037 | 4416 | DBG("Stopping tracing for ust app pid %d", app->pid); |
8be98f9a MD |
4417 | |
4418 | rcu_read_lock(); | |
4419 | ||
e0c7ec2b | 4420 | if (!app->compatible) { |
d88aee68 | 4421 | goto end_no_session; |
e0c7ec2b DG |
4422 | } |
4423 | ||
8be98f9a MD |
4424 | ua_sess = lookup_session_by_app(usess, app); |
4425 | if (ua_sess == NULL) { | |
d88aee68 | 4426 | goto end_no_session; |
8be98f9a MD |
4427 | } |
4428 | ||
d88aee68 DG |
4429 | pthread_mutex_lock(&ua_sess->lock); |
4430 | ||
b161602a MD |
4431 | if (ua_sess->deleted) { |
4432 | pthread_mutex_unlock(&ua_sess->lock); | |
4433 | goto end_no_session; | |
4434 | } | |
4435 | ||
9bc07046 DG |
4436 | /* |
4437 | * If started = 0, it means that stop trace has been called for a session | |
c45536e1 DG |
4438 | * that was never started. It's possible since we can have a fail start |
4439 | * from either the application manager thread or the command thread. Simply | |
4440 | * indicate that this is a stop error. | |
9bc07046 | 4441 | */ |
f9dfc3d9 | 4442 | if (!ua_sess->started) { |
c45536e1 DG |
4443 | goto error_rcu_unlock; |
4444 | } | |
7db205b5 | 4445 | |
840cb59c | 4446 | health_code_update(); |
86acf0da | 4447 | |
9d6c7d3f | 4448 | /* This inhibits UST tracing */ |
fb45065e | 4449 | pthread_mutex_lock(&app->sock_lock); |
852d0037 | 4450 | ret = ustctl_stop_session(app->sock, ua_sess->handle); |
fb45065e | 4451 | pthread_mutex_unlock(&app->sock_lock); |
9d6c7d3f | 4452 | if (ret < 0) { |
ffe60014 DG |
4453 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4454 | ERR("Error stopping tracing for app pid: %d (ret: %d)", | |
4455 | app->pid, ret); | |
4456 | } else { | |
4457 | DBG("UST app stop session failed. Application is dead."); | |
3757b385 DG |
4458 | /* |
4459 | * This is normal behavior, an application can die during the | |
4460 | * creation process. Don't report an error so the execution can | |
4461 | * continue normally. | |
4462 | */ | |
4463 | goto end_unlock; | |
ffe60014 | 4464 | } |
9d6c7d3f DG |
4465 | goto error_rcu_unlock; |
4466 | } | |
4467 | ||
840cb59c | 4468 | health_code_update(); |
86acf0da | 4469 | |
9d6c7d3f | 4470 | /* Quiescent wait after stopping trace */ |
fb45065e | 4471 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4472 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4473 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4474 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4475 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4476 | app->pid, ret); | |
4477 | } | |
9d6c7d3f | 4478 | |
840cb59c | 4479 | health_code_update(); |
86acf0da | 4480 | |
b34cbebf MD |
4481 | registry = get_session_registry(ua_sess); |
4482 | assert(registry); | |
1b532a60 | 4483 | |
ce34fcd0 MD |
4484 | /* Push metadata for application before freeing the application. */ |
4485 | (void) push_metadata(registry, ua_sess->consumer); | |
b34cbebf | 4486 | |
3757b385 | 4487 | end_unlock: |
b34cbebf MD |
4488 | pthread_mutex_unlock(&ua_sess->lock); |
4489 | end_no_session: | |
4490 | rcu_read_unlock(); | |
4491 | health_code_update(); | |
4492 | return 0; | |
4493 | ||
4494 | error_rcu_unlock: | |
4495 | pthread_mutex_unlock(&ua_sess->lock); | |
4496 | rcu_read_unlock(); | |
4497 | health_code_update(); | |
4498 | return -1; | |
4499 | } | |
4500 | ||
b34cbebf | 4501 | static |
c4b88406 MD |
4502 | int ust_app_flush_app_session(struct ust_app *app, |
4503 | struct ust_app_session *ua_sess) | |
b34cbebf | 4504 | { |
c4b88406 | 4505 | int ret, retval = 0; |
b34cbebf | 4506 | struct lttng_ht_iter iter; |
b34cbebf | 4507 | struct ust_app_channel *ua_chan; |
c4b88406 | 4508 | struct consumer_socket *socket; |
b34cbebf | 4509 | |
c4b88406 | 4510 | DBG("Flushing app session buffers for ust app pid %d", app->pid); |
b34cbebf MD |
4511 | |
4512 | rcu_read_lock(); | |
4513 | ||
4514 | if (!app->compatible) { | |
c4b88406 | 4515 | goto end_not_compatible; |
b34cbebf MD |
4516 | } |
4517 | ||
4518 | pthread_mutex_lock(&ua_sess->lock); | |
4519 | ||
b161602a MD |
4520 | if (ua_sess->deleted) { |
4521 | goto end_deleted; | |
4522 | } | |
4523 | ||
b34cbebf MD |
4524 | health_code_update(); |
4525 | ||
9d6c7d3f | 4526 | /* Flushing buffers */ |
c4b88406 MD |
4527 | socket = consumer_find_socket_by_bitness(app->bits_per_long, |
4528 | ua_sess->consumer); | |
ce34fcd0 MD |
4529 | |
4530 | /* Flush buffers and push metadata. */ | |
4531 | switch (ua_sess->buffer_type) { | |
4532 | case LTTNG_BUFFER_PER_PID: | |
4533 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, | |
4534 | node.node) { | |
4535 | health_code_update(); | |
ce34fcd0 MD |
4536 | ret = consumer_flush_channel(socket, ua_chan->key); |
4537 | if (ret) { | |
4538 | ERR("Error flushing consumer channel"); | |
4539 | retval = -1; | |
4540 | continue; | |
4541 | } | |
8be98f9a | 4542 | } |
ce34fcd0 MD |
4543 | break; |
4544 | case LTTNG_BUFFER_PER_UID: | |
4545 | default: | |
4546 | assert(0); | |
4547 | break; | |
8be98f9a | 4548 | } |
8be98f9a | 4549 | |
840cb59c | 4550 | health_code_update(); |
86acf0da | 4551 | |
b161602a | 4552 | end_deleted: |
d88aee68 | 4553 | pthread_mutex_unlock(&ua_sess->lock); |
ce34fcd0 | 4554 | |
c4b88406 MD |
4555 | end_not_compatible: |
4556 | rcu_read_unlock(); | |
4557 | health_code_update(); | |
4558 | return retval; | |
4559 | } | |
4560 | ||
4561 | /* | |
ce34fcd0 MD |
4562 | * Flush buffers for all applications for a specific UST session. |
4563 | * Called with UST session lock held. | |
c4b88406 MD |
4564 | */ |
4565 | static | |
ce34fcd0 | 4566 | int ust_app_flush_session(struct ltt_ust_session *usess) |
c4b88406 MD |
4567 | |
4568 | { | |
99b1411c | 4569 | int ret = 0; |
c4b88406 | 4570 | |
ce34fcd0 | 4571 | DBG("Flushing session buffers for all ust apps"); |
c4b88406 MD |
4572 | |
4573 | rcu_read_lock(); | |
4574 | ||
ce34fcd0 MD |
4575 | /* Flush buffers and push metadata. */ |
4576 | switch (usess->buffer_type) { | |
4577 | case LTTNG_BUFFER_PER_UID: | |
4578 | { | |
4579 | struct buffer_reg_uid *reg; | |
4580 | struct lttng_ht_iter iter; | |
4581 | ||
4582 | /* Flush all per UID buffers associated to that session. */ | |
4583 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4584 | struct ust_registry_session *ust_session_reg; | |
4585 | struct buffer_reg_channel *reg_chan; | |
4586 | struct consumer_socket *socket; | |
4587 | ||
4588 | /* Get consumer socket to use to push the metadata.*/ | |
4589 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
4590 | usess->consumer); | |
4591 | if (!socket) { | |
4592 | /* Ignore request if no consumer is found for the session. */ | |
4593 | continue; | |
4594 | } | |
4595 | ||
4596 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
4597 | reg_chan, node.node) { | |
4598 | /* | |
4599 | * The following call will print error values so the return | |
4600 | * code is of little importance because whatever happens, we | |
4601 | * have to try them all. | |
4602 | */ | |
4603 | (void) consumer_flush_channel(socket, reg_chan->consumer_key); | |
4604 | } | |
4605 | ||
4606 | ust_session_reg = reg->registry->reg.ust; | |
4607 | /* Push metadata. */ | |
4608 | (void) push_metadata(ust_session_reg, usess->consumer); | |
4609 | } | |
ce34fcd0 MD |
4610 | break; |
4611 | } | |
4612 | case LTTNG_BUFFER_PER_PID: | |
4613 | { | |
4614 | struct ust_app_session *ua_sess; | |
4615 | struct lttng_ht_iter iter; | |
4616 | struct ust_app *app; | |
4617 | ||
4618 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
4619 | ua_sess = lookup_session_by_app(usess, app); | |
4620 | if (ua_sess == NULL) { | |
4621 | continue; | |
4622 | } | |
4623 | (void) ust_app_flush_app_session(app, ua_sess); | |
4624 | } | |
4625 | break; | |
4626 | } | |
4627 | default: | |
99b1411c | 4628 | ret = -1; |
ce34fcd0 MD |
4629 | assert(0); |
4630 | break; | |
c4b88406 | 4631 | } |
c4b88406 | 4632 | |
7db205b5 | 4633 | rcu_read_unlock(); |
840cb59c | 4634 | health_code_update(); |
c4b88406 | 4635 | return ret; |
8be98f9a MD |
4636 | } |
4637 | ||
0dd01979 MD |
4638 | static |
4639 | int ust_app_clear_quiescent_app_session(struct ust_app *app, | |
4640 | struct ust_app_session *ua_sess) | |
4641 | { | |
4642 | int ret = 0; | |
4643 | struct lttng_ht_iter iter; | |
4644 | struct ust_app_channel *ua_chan; | |
4645 | struct consumer_socket *socket; | |
4646 | ||
4647 | DBG("Clearing stream quiescent state for ust app pid %d", app->pid); | |
4648 | ||
4649 | rcu_read_lock(); | |
4650 | ||
4651 | if (!app->compatible) { | |
4652 | goto end_not_compatible; | |
4653 | } | |
4654 | ||
4655 | pthread_mutex_lock(&ua_sess->lock); | |
4656 | ||
4657 | if (ua_sess->deleted) { | |
4658 | goto end_unlock; | |
4659 | } | |
4660 | ||
4661 | health_code_update(); | |
4662 | ||
4663 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
4664 | ua_sess->consumer); | |
4665 | if (!socket) { | |
4666 | ERR("Failed to find consumer (%" PRIu32 ") socket", | |
4667 | app->bits_per_long); | |
4668 | ret = -1; | |
4669 | goto end_unlock; | |
4670 | } | |
4671 | ||
4672 | /* Clear quiescent state. */ | |
4673 | switch (ua_sess->buffer_type) { | |
4674 | case LTTNG_BUFFER_PER_PID: | |
4675 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, | |
4676 | ua_chan, node.node) { | |
4677 | health_code_update(); | |
4678 | ret = consumer_clear_quiescent_channel(socket, | |
4679 | ua_chan->key); | |
4680 | if (ret) { | |
4681 | ERR("Error clearing quiescent state for consumer channel"); | |
4682 | ret = -1; | |
4683 | continue; | |
4684 | } | |
4685 | } | |
4686 | break; | |
4687 | case LTTNG_BUFFER_PER_UID: | |
4688 | default: | |
4689 | assert(0); | |
4690 | ret = -1; | |
4691 | break; | |
4692 | } | |
4693 | ||
4694 | health_code_update(); | |
4695 | ||
4696 | end_unlock: | |
4697 | pthread_mutex_unlock(&ua_sess->lock); | |
4698 | ||
4699 | end_not_compatible: | |
4700 | rcu_read_unlock(); | |
4701 | health_code_update(); | |
4702 | return ret; | |
4703 | } | |
4704 | ||
4705 | /* | |
4706 | * Clear quiescent state in each stream for all applications for a | |
4707 | * specific UST session. | |
4708 | * Called with UST session lock held. | |
4709 | */ | |
4710 | static | |
4711 | int ust_app_clear_quiescent_session(struct ltt_ust_session *usess) | |
4712 | ||
4713 | { | |
4714 | int ret = 0; | |
4715 | ||
4716 | DBG("Clearing stream quiescent state for all ust apps"); | |
4717 | ||
4718 | rcu_read_lock(); | |
4719 | ||
4720 | switch (usess->buffer_type) { | |
4721 | case LTTNG_BUFFER_PER_UID: | |
4722 | { | |
4723 | struct lttng_ht_iter iter; | |
4724 | struct buffer_reg_uid *reg; | |
4725 | ||
4726 | /* | |
4727 | * Clear quiescent for all per UID buffers associated to | |
4728 | * that session. | |
4729 | */ | |
4730 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
4731 | struct consumer_socket *socket; | |
4732 | struct buffer_reg_channel *reg_chan; | |
4733 | ||
4734 | /* Get associated consumer socket.*/ | |
4735 | socket = consumer_find_socket_by_bitness( | |
4736 | reg->bits_per_long, usess->consumer); | |
4737 | if (!socket) { | |
4738 | /* | |
4739 | * Ignore request if no consumer is found for | |
4740 | * the session. | |
4741 | */ | |
4742 | continue; | |
4743 | } | |
4744 | ||
4745 | cds_lfht_for_each_entry(reg->registry->channels->ht, | |
4746 | &iter.iter, reg_chan, node.node) { | |
4747 | /* | |
4748 | * The following call will print error values so | |
4749 | * the return code is of little importance | |
4750 | * because whatever happens, we have to try them | |
4751 | * all. | |
4752 | */ | |
4753 | (void) consumer_clear_quiescent_channel(socket, | |
4754 | reg_chan->consumer_key); | |
4755 | } | |
4756 | } | |
4757 | break; | |
4758 | } | |
4759 | case LTTNG_BUFFER_PER_PID: | |
4760 | { | |
4761 | struct ust_app_session *ua_sess; | |
4762 | struct lttng_ht_iter iter; | |
4763 | struct ust_app *app; | |
4764 | ||
4765 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, | |
4766 | pid_n.node) { | |
4767 | ua_sess = lookup_session_by_app(usess, app); | |
4768 | if (ua_sess == NULL) { | |
4769 | continue; | |
4770 | } | |
4771 | (void) ust_app_clear_quiescent_app_session(app, | |
4772 | ua_sess); | |
4773 | } | |
4774 | break; | |
4775 | } | |
4776 | default: | |
4777 | ret = -1; | |
4778 | assert(0); | |
4779 | break; | |
4780 | } | |
4781 | ||
4782 | rcu_read_unlock(); | |
4783 | health_code_update(); | |
4784 | return ret; | |
4785 | } | |
4786 | ||
84cd17c6 MD |
4787 | /* |
4788 | * Destroy a specific UST session in apps. | |
4789 | */ | |
3353de95 | 4790 | static int destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
84cd17c6 | 4791 | { |
ffe60014 | 4792 | int ret; |
84cd17c6 | 4793 | struct ust_app_session *ua_sess; |
bec39940 | 4794 | struct lttng_ht_iter iter; |
d9bf3ca4 | 4795 | struct lttng_ht_node_u64 *node; |
84cd17c6 | 4796 | |
852d0037 | 4797 | DBG("Destroy tracing for ust app pid %d", app->pid); |
84cd17c6 MD |
4798 | |
4799 | rcu_read_lock(); | |
4800 | ||
e0c7ec2b DG |
4801 | if (!app->compatible) { |
4802 | goto end; | |
4803 | } | |
4804 | ||
84cd17c6 | 4805 | __lookup_session_by_app(usess, app, &iter); |
d9bf3ca4 | 4806 | node = lttng_ht_iter_get_node_u64(&iter); |
84cd17c6 | 4807 | if (node == NULL) { |
d42f20df DG |
4808 | /* Session is being or is deleted. */ |
4809 | goto end; | |
84cd17c6 MD |
4810 | } |
4811 | ua_sess = caa_container_of(node, struct ust_app_session, node); | |
c4a1715b | 4812 | |
840cb59c | 4813 | health_code_update(); |
d0b96690 | 4814 | destroy_app_session(app, ua_sess); |
84cd17c6 | 4815 | |
840cb59c | 4816 | health_code_update(); |
7db205b5 | 4817 | |
84cd17c6 | 4818 | /* Quiescent wait after stopping trace */ |
fb45065e | 4819 | pthread_mutex_lock(&app->sock_lock); |
ffe60014 | 4820 | ret = ustctl_wait_quiescent(app->sock); |
fb45065e | 4821 | pthread_mutex_unlock(&app->sock_lock); |
ffe60014 DG |
4822 | if (ret < 0 && ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { |
4823 | ERR("UST app wait quiescent failed for app pid %d ret %d", | |
4824 | app->pid, ret); | |
4825 | } | |
e0c7ec2b DG |
4826 | end: |
4827 | rcu_read_unlock(); | |
840cb59c | 4828 | health_code_update(); |
84cd17c6 | 4829 | return 0; |
84cd17c6 MD |
4830 | } |
4831 | ||
5b4a0ec0 DG |
4832 | /* |
4833 | * Start tracing for the UST session. | |
4834 | */ | |
421cb601 DG |
4835 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
4836 | { | |
4837 | int ret = 0; | |
bec39940 | 4838 | struct lttng_ht_iter iter; |
421cb601 | 4839 | struct ust_app *app; |
48842b30 | 4840 | |
421cb601 DG |
4841 | DBG("Starting all UST traces"); |
4842 | ||
4843 | rcu_read_lock(); | |
421cb601 | 4844 | |
0dd01979 MD |
4845 | /* |
4846 | * In a start-stop-start use-case, we need to clear the quiescent state | |
4847 | * of each channel set by the prior stop command, thus ensuring that a | |
4848 | * following stop or destroy is sure to grab a timestamp_end near those | |
4849 | * operations, even if the packet is empty. | |
4850 | */ | |
4851 | (void) ust_app_clear_quiescent_session(usess); | |
4852 | ||
852d0037 | 4853 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
421cb601 | 4854 | ret = ust_app_start_trace(usess, app); |
48842b30 | 4855 | if (ret < 0) { |
5b4a0ec0 DG |
4856 | /* Continue to next apps even on error */ |
4857 | continue; | |
48842b30 | 4858 | } |
48842b30 | 4859 | } |
5b4a0ec0 | 4860 | |
48842b30 DG |
4861 | rcu_read_unlock(); |
4862 | ||
4863 | return 0; | |
4864 | } | |
487cf67c | 4865 | |
8be98f9a MD |
4866 | /* |
4867 | * Start tracing for the UST session. | |
ce34fcd0 | 4868 | * Called with UST session lock held. |
8be98f9a MD |
4869 | */ |
4870 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) | |
4871 | { | |
4872 | int ret = 0; | |
bec39940 | 4873 | struct lttng_ht_iter iter; |
8be98f9a MD |
4874 | struct ust_app *app; |
4875 | ||
4876 | DBG("Stopping all UST traces"); | |
4877 | ||
4878 | rcu_read_lock(); | |
4879 | ||
b34cbebf MD |
4880 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
4881 | ret = ust_app_stop_trace(usess, app); | |
4882 | if (ret < 0) { | |
4883 | /* Continue to next apps even on error */ | |
4884 | continue; | |
4885 | } | |
4886 | } | |
4887 | ||
ce34fcd0 | 4888 | (void) ust_app_flush_session(usess); |
8be98f9a MD |
4889 | |
4890 | rcu_read_unlock(); | |
4891 | ||
4892 | return 0; | |
4893 | } | |
4894 | ||
84cd17c6 MD |
4895 | /* |
4896 | * Destroy app UST session. | |
4897 | */ | |
4898 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) | |
4899 | { | |
4900 | int ret = 0; | |
bec39940 | 4901 | struct lttng_ht_iter iter; |
84cd17c6 MD |
4902 | struct ust_app *app; |
4903 | ||
4904 | DBG("Destroy all UST traces"); | |
4905 | ||
4906 | rcu_read_lock(); | |
4907 | ||
852d0037 | 4908 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
3353de95 | 4909 | ret = destroy_trace(usess, app); |
84cd17c6 MD |
4910 | if (ret < 0) { |
4911 | /* Continue to next apps even on error */ | |
4912 | continue; | |
4913 | } | |
4914 | } | |
4915 | ||
4916 | rcu_read_unlock(); | |
4917 | ||
4918 | return 0; | |
4919 | } | |
4920 | ||
a9ad0c8f MD |
4921 | static |
4922 | void ust_app_global_create(struct ltt_ust_session *usess, struct ust_app *app) | |
487cf67c | 4923 | { |
55c54cce | 4924 | int ret = 0; |
31746f93 | 4925 | struct lttng_ht_iter iter, uiter; |
3d8ca23b | 4926 | struct ust_app_session *ua_sess = NULL; |
487cf67c DG |
4927 | struct ust_app_channel *ua_chan; |
4928 | struct ust_app_event *ua_event; | |
727d5404 | 4929 | struct ust_app_ctx *ua_ctx; |
a9ad0c8f | 4930 | int is_created = 0; |
1f3580c7 | 4931 | |
a9ad0c8f | 4932 | ret = create_ust_app_session(usess, app, &ua_sess, &is_created); |
3d8ca23b DG |
4933 | if (ret < 0) { |
4934 | /* Tracer is probably gone or ENOMEM. */ | |
487cf67c DG |
4935 | goto error; |
4936 | } | |
a9ad0c8f MD |
4937 | if (!is_created) { |
4938 | /* App session already created. */ | |
4939 | goto end; | |
4940 | } | |
3d8ca23b | 4941 | assert(ua_sess); |
487cf67c | 4942 | |
d0b96690 DG |
4943 | pthread_mutex_lock(&ua_sess->lock); |
4944 | ||
b161602a MD |
4945 | if (ua_sess->deleted) { |
4946 | pthread_mutex_unlock(&ua_sess->lock); | |
4947 | goto end; | |
4948 | } | |
4949 | ||
284d8f55 | 4950 | /* |
d0b96690 | 4951 | * We can iterate safely here over all UST app session since the create ust |
284d8f55 DG |
4952 | * app session above made a shadow copy of the UST global domain from the |
4953 | * ltt ust session. | |
4954 | */ | |
bec39940 DG |
4955 | cds_lfht_for_each_entry(ua_sess->channels->ht, &iter.iter, ua_chan, |
4956 | node.node) { | |
ad7a9107 | 4957 | ret = do_create_channel(app, usess, ua_sess, ua_chan); |
a7169585 | 4958 | if (ret < 0 && ret != -ENOTCONN) { |
ad7a9107 | 4959 | /* |
a7169585 MD |
4960 | * Stop everything. On error, the application |
4961 | * failed, no more file descriptor are available | |
4962 | * or ENOMEM so stopping here is the only thing | |
4963 | * we can do for now. The only exception is | |
4964 | * -ENOTCONN, which indicates that the application | |
4965 | * has exit. | |
ad7a9107 DG |
4966 | */ |
4967 | goto error_unlock; | |
487cf67c DG |
4968 | } |
4969 | ||
31746f93 DG |
4970 | /* |
4971 | * Add context using the list so they are enabled in the same order the | |
4972 | * user added them. | |
4973 | */ | |
4974 | cds_list_for_each_entry(ua_ctx, &ua_chan->ctx_list, list) { | |
727d5404 DG |
4975 | ret = create_ust_channel_context(ua_chan, ua_ctx, app); |
4976 | if (ret < 0) { | |
d0b96690 | 4977 | goto error_unlock; |
727d5404 DG |
4978 | } |
4979 | } | |
4980 | ||
4981 | ||
284d8f55 | 4982 | /* For each events */ |
bec39940 DG |
4983 | cds_lfht_for_each_entry(ua_chan->events->ht, &uiter.iter, ua_event, |
4984 | node.node) { | |
284d8f55 DG |
4985 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
4986 | if (ret < 0) { | |
d0b96690 | 4987 | goto error_unlock; |
487cf67c | 4988 | } |
36dc12cc | 4989 | } |
487cf67c DG |
4990 | } |
4991 | ||
d0b96690 DG |
4992 | pthread_mutex_unlock(&ua_sess->lock); |
4993 | ||
14fb1ebe | 4994 | if (usess->active) { |
421cb601 | 4995 | ret = ust_app_start_trace(usess, app); |
36dc12cc | 4996 | if (ret < 0) { |
36dc12cc DG |
4997 | goto error; |
4998 | } | |
4999 | ||
852d0037 | 5000 | DBG2("UST trace started for app pid %d", app->pid); |
36dc12cc | 5001 | } |
a9ad0c8f | 5002 | end: |
ffe60014 | 5003 | /* Everything went well at this point. */ |
ffe60014 DG |
5004 | return; |
5005 | ||
d0b96690 DG |
5006 | error_unlock: |
5007 | pthread_mutex_unlock(&ua_sess->lock); | |
487cf67c | 5008 | error: |
ffe60014 | 5009 | if (ua_sess) { |
d0b96690 | 5010 | destroy_app_session(app, ua_sess); |
ffe60014 | 5011 | } |
487cf67c DG |
5012 | return; |
5013 | } | |
55cc08a6 | 5014 | |
a9ad0c8f MD |
5015 | static |
5016 | void ust_app_global_destroy(struct ltt_ust_session *usess, struct ust_app *app) | |
5017 | { | |
5018 | struct ust_app_session *ua_sess; | |
5019 | ||
5020 | ua_sess = lookup_session_by_app(usess, app); | |
5021 | if (ua_sess == NULL) { | |
5022 | return; | |
5023 | } | |
5024 | destroy_app_session(app, ua_sess); | |
5025 | } | |
5026 | ||
5027 | /* | |
5028 | * Add channels/events from UST global domain to registered apps at sock. | |
5029 | * | |
5030 | * Called with session lock held. | |
5031 | * Called with RCU read-side lock held. | |
5032 | */ | |
5033 | void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app) | |
5034 | { | |
5035 | assert(usess); | |
5036 | ||
5037 | DBG2("UST app global update for app sock %d for session id %" PRIu64, | |
5038 | app->sock, usess->id); | |
5039 | ||
5040 | if (!app->compatible) { | |
5041 | return; | |
5042 | } | |
5043 | ||
5044 | if (trace_ust_pid_tracker_lookup(usess, app->pid)) { | |
5045 | ust_app_global_create(usess, app); | |
5046 | } else { | |
5047 | ust_app_global_destroy(usess, app); | |
5048 | } | |
5049 | } | |
5050 | ||
5051 | /* | |
5052 | * Called with session lock held. | |
5053 | */ | |
5054 | void ust_app_global_update_all(struct ltt_ust_session *usess) | |
5055 | { | |
5056 | struct lttng_ht_iter iter; | |
5057 | struct ust_app *app; | |
5058 | ||
5059 | rcu_read_lock(); | |
5060 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5061 | ust_app_global_update(usess, app); | |
5062 | } | |
5063 | rcu_read_unlock(); | |
5064 | } | |
5065 | ||
55cc08a6 DG |
5066 | /* |
5067 | * Add context to a specific channel for global UST domain. | |
5068 | */ | |
5069 | int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess, | |
5070 | struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx) | |
5071 | { | |
5072 | int ret = 0; | |
bec39940 DG |
5073 | struct lttng_ht_node_str *ua_chan_node; |
5074 | struct lttng_ht_iter iter, uiter; | |
55cc08a6 DG |
5075 | struct ust_app_channel *ua_chan = NULL; |
5076 | struct ust_app_session *ua_sess; | |
5077 | struct ust_app *app; | |
5078 | ||
5079 | rcu_read_lock(); | |
5080 | ||
852d0037 | 5081 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { |
e0c7ec2b DG |
5082 | if (!app->compatible) { |
5083 | /* | |
5084 | * TODO: In time, we should notice the caller of this error by | |
5085 | * telling him that this is a version error. | |
5086 | */ | |
5087 | continue; | |
5088 | } | |
55cc08a6 DG |
5089 | ua_sess = lookup_session_by_app(usess, app); |
5090 | if (ua_sess == NULL) { | |
5091 | continue; | |
5092 | } | |
5093 | ||
d0b96690 | 5094 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5095 | |
5096 | if (ua_sess->deleted) { | |
5097 | pthread_mutex_unlock(&ua_sess->lock); | |
5098 | continue; | |
5099 | } | |
5100 | ||
55cc08a6 | 5101 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5102 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &uiter); |
5103 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); | |
55cc08a6 | 5104 | if (ua_chan_node == NULL) { |
d0b96690 | 5105 | goto next_app; |
55cc08a6 DG |
5106 | } |
5107 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, | |
5108 | node); | |
55cc08a6 DG |
5109 | ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app); |
5110 | if (ret < 0) { | |
d0b96690 | 5111 | goto next_app; |
55cc08a6 | 5112 | } |
d0b96690 DG |
5113 | next_app: |
5114 | pthread_mutex_unlock(&ua_sess->lock); | |
55cc08a6 DG |
5115 | } |
5116 | ||
55cc08a6 DG |
5117 | rcu_read_unlock(); |
5118 | return ret; | |
5119 | } | |
5120 | ||
76d45b40 DG |
5121 | /* |
5122 | * Enable event for a channel from a UST session for a specific PID. | |
5123 | */ | |
5124 | int ust_app_enable_event_pid(struct ltt_ust_session *usess, | |
5125 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid) | |
5126 | { | |
5127 | int ret = 0; | |
bec39940 | 5128 | struct lttng_ht_iter iter; |
18eace3b | 5129 | struct lttng_ht_node_str *ua_chan_node; |
76d45b40 DG |
5130 | struct ust_app *app; |
5131 | struct ust_app_session *ua_sess; | |
5132 | struct ust_app_channel *ua_chan; | |
5133 | struct ust_app_event *ua_event; | |
5134 | ||
5135 | DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid); | |
5136 | ||
5137 | rcu_read_lock(); | |
5138 | ||
5139 | app = ust_app_find_by_pid(pid); | |
5140 | if (app == NULL) { | |
5141 | ERR("UST app enable event per PID %d not found", pid); | |
5142 | ret = -1; | |
d0b96690 | 5143 | goto end; |
76d45b40 DG |
5144 | } |
5145 | ||
e0c7ec2b DG |
5146 | if (!app->compatible) { |
5147 | ret = 0; | |
d0b96690 | 5148 | goto end; |
e0c7ec2b DG |
5149 | } |
5150 | ||
76d45b40 | 5151 | ua_sess = lookup_session_by_app(usess, app); |
c4a1715b DG |
5152 | if (!ua_sess) { |
5153 | /* The application has problem or is probably dead. */ | |
d0b96690 DG |
5154 | ret = 0; |
5155 | goto end; | |
c4a1715b | 5156 | } |
76d45b40 | 5157 | |
d0b96690 | 5158 | pthread_mutex_lock(&ua_sess->lock); |
b161602a MD |
5159 | |
5160 | if (ua_sess->deleted) { | |
5161 | ret = 0; | |
5162 | goto end_unlock; | |
5163 | } | |
5164 | ||
76d45b40 | 5165 | /* Lookup channel in the ust app session */ |
bec39940 DG |
5166 | lttng_ht_lookup(ua_sess->channels, (void *)uchan->name, &iter); |
5167 | ua_chan_node = lttng_ht_iter_get_node_str(&iter); | |
76d45b40 DG |
5168 | /* If the channel is not found, there is a code flow error */ |
5169 | assert(ua_chan_node); | |
5170 | ||
5171 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
5172 | ||
18eace3b | 5173 | ua_event = find_ust_app_event(ua_chan->events, uevent->attr.name, |
39c5a3a7 | 5174 | uevent->filter, uevent->attr.loglevel, uevent->exclusion); |
18eace3b | 5175 | if (ua_event == NULL) { |
76d45b40 DG |
5176 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
5177 | if (ret < 0) { | |
d0b96690 | 5178 | goto end_unlock; |
76d45b40 DG |
5179 | } |
5180 | } else { | |
76d45b40 DG |
5181 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
5182 | if (ret < 0) { | |
d0b96690 | 5183 | goto end_unlock; |
76d45b40 DG |
5184 | } |
5185 | } | |
5186 | ||
d0b96690 DG |
5187 | end_unlock: |
5188 | pthread_mutex_unlock(&ua_sess->lock); | |
5189 | end: | |
76d45b40 DG |
5190 | rcu_read_unlock(); |
5191 | return ret; | |
5192 | } | |
7f79d3a1 | 5193 | |
d0b96690 DG |
5194 | /* |
5195 | * Receive registration and populate the given msg structure. | |
5196 | * | |
5197 | * On success return 0 else a negative value returned by the ustctl call. | |
5198 | */ | |
5199 | int ust_app_recv_registration(int sock, struct ust_register_msg *msg) | |
5200 | { | |
5201 | int ret; | |
5202 | uint32_t pid, ppid, uid, gid; | |
5203 | ||
5204 | assert(msg); | |
5205 | ||
5206 | ret = ustctl_recv_reg_msg(sock, &msg->type, &msg->major, &msg->minor, | |
5207 | &pid, &ppid, &uid, &gid, | |
5208 | &msg->bits_per_long, | |
5209 | &msg->uint8_t_alignment, | |
5210 | &msg->uint16_t_alignment, | |
5211 | &msg->uint32_t_alignment, | |
5212 | &msg->uint64_t_alignment, | |
5213 | &msg->long_alignment, | |
5214 | &msg->byte_order, | |
5215 | msg->name); | |
5216 | if (ret < 0) { | |
5217 | switch (-ret) { | |
5218 | case EPIPE: | |
5219 | case ECONNRESET: | |
5220 | case LTTNG_UST_ERR_EXITING: | |
5221 | DBG3("UST app recv reg message failed. Application died"); | |
5222 | break; | |
5223 | case LTTNG_UST_ERR_UNSUP_MAJOR: | |
5224 | ERR("UST app recv reg unsupported version %d.%d. Supporting %d.%d", | |
5225 | msg->major, msg->minor, LTTNG_UST_ABI_MAJOR_VERSION, | |
5226 | LTTNG_UST_ABI_MINOR_VERSION); | |
5227 | break; | |
5228 | default: | |
5229 | ERR("UST app recv reg message failed with ret %d", ret); | |
5230 | break; | |
5231 | } | |
5232 | goto error; | |
5233 | } | |
5234 | msg->pid = (pid_t) pid; | |
5235 | msg->ppid = (pid_t) ppid; | |
5236 | msg->uid = (uid_t) uid; | |
5237 | msg->gid = (gid_t) gid; | |
5238 | ||
5239 | error: | |
5240 | return ret; | |
5241 | } | |
5242 | ||
10b56aef MD |
5243 | /* |
5244 | * Return a ust app session object using the application object and the | |
5245 | * session object descriptor has a key. If not found, NULL is returned. | |
5246 | * A RCU read side lock MUST be acquired when calling this function. | |
5247 | */ | |
5248 | static struct ust_app_session *find_session_by_objd(struct ust_app *app, | |
5249 | int objd) | |
5250 | { | |
5251 | struct lttng_ht_node_ulong *node; | |
5252 | struct lttng_ht_iter iter; | |
5253 | struct ust_app_session *ua_sess = NULL; | |
5254 | ||
5255 | assert(app); | |
5256 | ||
5257 | lttng_ht_lookup(app->ust_sessions_objd, (void *)((unsigned long) objd), &iter); | |
5258 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5259 | if (node == NULL) { | |
5260 | DBG2("UST app session find by objd %d not found", objd); | |
5261 | goto error; | |
5262 | } | |
5263 | ||
5264 | ua_sess = caa_container_of(node, struct ust_app_session, ust_objd_node); | |
5265 | ||
5266 | error: | |
5267 | return ua_sess; | |
5268 | } | |
5269 | ||
d88aee68 DG |
5270 | /* |
5271 | * Return a ust app channel object using the application object and the channel | |
5272 | * object descriptor has a key. If not found, NULL is returned. A RCU read side | |
5273 | * lock MUST be acquired before calling this function. | |
5274 | */ | |
d0b96690 DG |
5275 | static struct ust_app_channel *find_channel_by_objd(struct ust_app *app, |
5276 | int objd) | |
5277 | { | |
5278 | struct lttng_ht_node_ulong *node; | |
5279 | struct lttng_ht_iter iter; | |
5280 | struct ust_app_channel *ua_chan = NULL; | |
5281 | ||
5282 | assert(app); | |
5283 | ||
5284 | lttng_ht_lookup(app->ust_objd, (void *)((unsigned long) objd), &iter); | |
5285 | node = lttng_ht_iter_get_node_ulong(&iter); | |
5286 | if (node == NULL) { | |
5287 | DBG2("UST app channel find by objd %d not found", objd); | |
5288 | goto error; | |
5289 | } | |
5290 | ||
5291 | ua_chan = caa_container_of(node, struct ust_app_channel, ust_objd_node); | |
5292 | ||
5293 | error: | |
5294 | return ua_chan; | |
5295 | } | |
5296 | ||
d88aee68 DG |
5297 | /* |
5298 | * Reply to a register channel notification from an application on the notify | |
5299 | * socket. The channel metadata is also created. | |
5300 | * | |
5301 | * The session UST registry lock is acquired in this function. | |
5302 | * | |
5303 | * On success 0 is returned else a negative value. | |
5304 | */ | |
d0b96690 DG |
5305 | static int reply_ust_register_channel(int sock, int sobjd, int cobjd, |
5306 | size_t nr_fields, struct ustctl_field *fields) | |
5307 | { | |
5308 | int ret, ret_code = 0; | |
5309 | uint32_t chan_id, reg_count; | |
7972aab2 | 5310 | uint64_t chan_reg_key; |
d0b96690 DG |
5311 | enum ustctl_channel_header type; |
5312 | struct ust_app *app; | |
5313 | struct ust_app_channel *ua_chan; | |
5314 | struct ust_app_session *ua_sess; | |
7972aab2 | 5315 | struct ust_registry_session *registry; |
45893984 | 5316 | struct ust_registry_channel *chan_reg; |
d0b96690 DG |
5317 | |
5318 | rcu_read_lock(); | |
5319 | ||
5320 | /* Lookup application. If not found, there is a code flow error. */ | |
5321 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5322 | if (!app) { |
5323 | DBG("Application socket %d is being teardown. Abort event notify", | |
5324 | sock); | |
5325 | ret = 0; | |
d5d629b5 | 5326 | free(fields); |
d88aee68 DG |
5327 | goto error_rcu_unlock; |
5328 | } | |
d0b96690 | 5329 | |
4950b860 | 5330 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5331 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5332 | if (!ua_chan) { |
5333 | DBG("Application channel is being teardown. Abort event notify"); | |
5334 | ret = 0; | |
d5d629b5 | 5335 | free(fields); |
4950b860 MD |
5336 | goto error_rcu_unlock; |
5337 | } | |
5338 | ||
d0b96690 DG |
5339 | assert(ua_chan->session); |
5340 | ua_sess = ua_chan->session; | |
d0b96690 | 5341 | |
7972aab2 DG |
5342 | /* Get right session registry depending on the session buffer type. */ |
5343 | registry = get_session_registry(ua_sess); | |
5344 | assert(registry); | |
45893984 | 5345 | |
7972aab2 DG |
5346 | /* Depending on the buffer type, a different channel key is used. */ |
5347 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5348 | chan_reg_key = ua_chan->tracing_channel_id; | |
d0b96690 | 5349 | } else { |
7972aab2 | 5350 | chan_reg_key = ua_chan->key; |
d0b96690 DG |
5351 | } |
5352 | ||
7972aab2 DG |
5353 | pthread_mutex_lock(®istry->lock); |
5354 | ||
5355 | chan_reg = ust_registry_channel_find(registry, chan_reg_key); | |
5356 | assert(chan_reg); | |
5357 | ||
5358 | if (!chan_reg->register_done) { | |
5359 | reg_count = ust_registry_get_event_count(chan_reg); | |
5360 | if (reg_count < 31) { | |
5361 | type = USTCTL_CHANNEL_HEADER_COMPACT; | |
5362 | } else { | |
5363 | type = USTCTL_CHANNEL_HEADER_LARGE; | |
5364 | } | |
5365 | ||
5366 | chan_reg->nr_ctx_fields = nr_fields; | |
5367 | chan_reg->ctx_fields = fields; | |
5368 | chan_reg->header_type = type; | |
d0b96690 | 5369 | } else { |
7972aab2 DG |
5370 | /* Get current already assigned values. */ |
5371 | type = chan_reg->header_type; | |
d5d629b5 DG |
5372 | free(fields); |
5373 | /* Set to NULL so the error path does not do a double free. */ | |
5374 | fields = NULL; | |
d0b96690 | 5375 | } |
7972aab2 DG |
5376 | /* Channel id is set during the object creation. */ |
5377 | chan_id = chan_reg->chan_id; | |
d0b96690 DG |
5378 | |
5379 | /* Append to metadata */ | |
7972aab2 DG |
5380 | if (!chan_reg->metadata_dumped) { |
5381 | ret_code = ust_metadata_channel_statedump(registry, chan_reg); | |
d0b96690 DG |
5382 | if (ret_code) { |
5383 | ERR("Error appending channel metadata (errno = %d)", ret_code); | |
5384 | goto reply; | |
5385 | } | |
5386 | } | |
5387 | ||
5388 | reply: | |
7972aab2 DG |
5389 | DBG3("UST app replying to register channel key %" PRIu64 |
5390 | " with id %u, type: %d, ret: %d", chan_reg_key, chan_id, type, | |
5391 | ret_code); | |
d0b96690 DG |
5392 | |
5393 | ret = ustctl_reply_register_channel(sock, chan_id, type, ret_code); | |
5394 | if (ret < 0) { | |
5395 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5396 | ERR("UST app reply channel failed with ret %d", ret); | |
5397 | } else { | |
5398 | DBG3("UST app reply channel failed. Application died"); | |
5399 | } | |
5400 | goto error; | |
5401 | } | |
5402 | ||
7972aab2 DG |
5403 | /* This channel registry registration is completed. */ |
5404 | chan_reg->register_done = 1; | |
5405 | ||
d0b96690 | 5406 | error: |
7972aab2 | 5407 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5408 | error_rcu_unlock: |
d0b96690 | 5409 | rcu_read_unlock(); |
d5d629b5 DG |
5410 | if (ret) { |
5411 | free(fields); | |
5412 | } | |
d0b96690 DG |
5413 | return ret; |
5414 | } | |
5415 | ||
d88aee68 DG |
5416 | /* |
5417 | * Add event to the UST channel registry. When the event is added to the | |
5418 | * registry, the metadata is also created. Once done, this replies to the | |
5419 | * application with the appropriate error code. | |
5420 | * | |
5421 | * The session UST registry lock is acquired in the function. | |
5422 | * | |
5423 | * On success 0 is returned else a negative value. | |
5424 | */ | |
d0b96690 | 5425 | static int add_event_ust_registry(int sock, int sobjd, int cobjd, char *name, |
2106efa0 PP |
5426 | char *sig, size_t nr_fields, struct ustctl_field *fields, |
5427 | int loglevel_value, char *model_emf_uri) | |
d0b96690 DG |
5428 | { |
5429 | int ret, ret_code; | |
5430 | uint32_t event_id = 0; | |
7972aab2 | 5431 | uint64_t chan_reg_key; |
d0b96690 DG |
5432 | struct ust_app *app; |
5433 | struct ust_app_channel *ua_chan; | |
5434 | struct ust_app_session *ua_sess; | |
7972aab2 | 5435 | struct ust_registry_session *registry; |
d0b96690 DG |
5436 | |
5437 | rcu_read_lock(); | |
5438 | ||
5439 | /* Lookup application. If not found, there is a code flow error. */ | |
5440 | app = find_app_by_notify_sock(sock); | |
d88aee68 DG |
5441 | if (!app) { |
5442 | DBG("Application socket %d is being teardown. Abort event notify", | |
5443 | sock); | |
5444 | ret = 0; | |
d5d629b5 DG |
5445 | free(sig); |
5446 | free(fields); | |
5447 | free(model_emf_uri); | |
d88aee68 DG |
5448 | goto error_rcu_unlock; |
5449 | } | |
d0b96690 | 5450 | |
4950b860 | 5451 | /* Lookup channel by UST object descriptor. */ |
d0b96690 | 5452 | ua_chan = find_channel_by_objd(app, cobjd); |
4950b860 MD |
5453 | if (!ua_chan) { |
5454 | DBG("Application channel is being teardown. Abort event notify"); | |
5455 | ret = 0; | |
d5d629b5 DG |
5456 | free(sig); |
5457 | free(fields); | |
5458 | free(model_emf_uri); | |
4950b860 MD |
5459 | goto error_rcu_unlock; |
5460 | } | |
5461 | ||
d0b96690 DG |
5462 | assert(ua_chan->session); |
5463 | ua_sess = ua_chan->session; | |
5464 | ||
7972aab2 DG |
5465 | registry = get_session_registry(ua_sess); |
5466 | assert(registry); | |
5467 | ||
5468 | if (ua_sess->buffer_type == LTTNG_BUFFER_PER_UID) { | |
5469 | chan_reg_key = ua_chan->tracing_channel_id; | |
5470 | } else { | |
5471 | chan_reg_key = ua_chan->key; | |
5472 | } | |
5473 | ||
5474 | pthread_mutex_lock(®istry->lock); | |
d0b96690 | 5475 | |
d5d629b5 DG |
5476 | /* |
5477 | * From this point on, this call acquires the ownership of the sig, fields | |
5478 | * and model_emf_uri meaning any free are done inside it if needed. These | |
5479 | * three variables MUST NOT be read/write after this. | |
5480 | */ | |
7972aab2 | 5481 | ret_code = ust_registry_create_event(registry, chan_reg_key, |
2106efa0 PP |
5482 | sobjd, cobjd, name, sig, nr_fields, fields, |
5483 | loglevel_value, model_emf_uri, ua_sess->buffer_type, | |
5484 | &event_id, app); | |
d0b96690 DG |
5485 | |
5486 | /* | |
5487 | * The return value is returned to ustctl so in case of an error, the | |
5488 | * application can be notified. In case of an error, it's important not to | |
5489 | * return a negative error or else the application will get closed. | |
5490 | */ | |
5491 | ret = ustctl_reply_register_event(sock, event_id, ret_code); | |
5492 | if (ret < 0) { | |
5493 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5494 | ERR("UST app reply event failed with ret %d", ret); | |
5495 | } else { | |
5496 | DBG3("UST app reply event failed. Application died"); | |
5497 | } | |
5498 | /* | |
5499 | * No need to wipe the create event since the application socket will | |
5500 | * get close on error hence cleaning up everything by itself. | |
5501 | */ | |
5502 | goto error; | |
5503 | } | |
5504 | ||
7972aab2 DG |
5505 | DBG3("UST registry event %s with id %" PRId32 " added successfully", |
5506 | name, event_id); | |
d88aee68 | 5507 | |
d0b96690 | 5508 | error: |
7972aab2 | 5509 | pthread_mutex_unlock(®istry->lock); |
d88aee68 | 5510 | error_rcu_unlock: |
d0b96690 DG |
5511 | rcu_read_unlock(); |
5512 | return ret; | |
5513 | } | |
5514 | ||
10b56aef MD |
5515 | /* |
5516 | * Add enum to the UST session registry. Once done, this replies to the | |
5517 | * application with the appropriate error code. | |
5518 | * | |
5519 | * The session UST registry lock is acquired within this function. | |
5520 | * | |
5521 | * On success 0 is returned else a negative value. | |
5522 | */ | |
5523 | static int add_enum_ust_registry(int sock, int sobjd, char *name, | |
5524 | struct ustctl_enum_entry *entries, size_t nr_entries) | |
5525 | { | |
5526 | int ret = 0, ret_code; | |
5527 | struct ust_app *app; | |
5528 | struct ust_app_session *ua_sess; | |
5529 | struct ust_registry_session *registry; | |
5530 | uint64_t enum_id = -1ULL; | |
5531 | ||
5532 | rcu_read_lock(); | |
5533 | ||
5534 | /* Lookup application. If not found, there is a code flow error. */ | |
5535 | app = find_app_by_notify_sock(sock); | |
5536 | if (!app) { | |
5537 | /* Return an error since this is not an error */ | |
5538 | DBG("Application socket %d is being torn down. Aborting enum registration", | |
5539 | sock); | |
5540 | free(entries); | |
5541 | goto error_rcu_unlock; | |
5542 | } | |
5543 | ||
5544 | /* Lookup session by UST object descriptor. */ | |
5545 | ua_sess = find_session_by_objd(app, sobjd); | |
5546 | if (!ua_sess) { | |
5547 | /* Return an error since this is not an error */ | |
5548 | DBG("Application session is being torn down. Aborting enum registration."); | |
5549 | free(entries); | |
5550 | goto error_rcu_unlock; | |
5551 | } | |
5552 | ||
5553 | registry = get_session_registry(ua_sess); | |
5554 | assert(registry); | |
5555 | ||
5556 | pthread_mutex_lock(®istry->lock); | |
5557 | ||
5558 | /* | |
5559 | * From this point on, the callee acquires the ownership of | |
5560 | * entries. The variable entries MUST NOT be read/written after | |
5561 | * call. | |
5562 | */ | |
5563 | ret_code = ust_registry_create_or_find_enum(registry, sobjd, name, | |
5564 | entries, nr_entries, &enum_id); | |
5565 | entries = NULL; | |
5566 | ||
5567 | /* | |
5568 | * The return value is returned to ustctl so in case of an error, the | |
5569 | * application can be notified. In case of an error, it's important not to | |
5570 | * return a negative error or else the application will get closed. | |
5571 | */ | |
5572 | ret = ustctl_reply_register_enum(sock, enum_id, ret_code); | |
5573 | if (ret < 0) { | |
5574 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5575 | ERR("UST app reply enum failed with ret %d", ret); | |
5576 | } else { | |
5577 | DBG3("UST app reply enum failed. Application died"); | |
5578 | } | |
5579 | /* | |
5580 | * No need to wipe the create enum since the application socket will | |
5581 | * get close on error hence cleaning up everything by itself. | |
5582 | */ | |
5583 | goto error; | |
5584 | } | |
5585 | ||
5586 | DBG3("UST registry enum %s added successfully or already found", name); | |
5587 | ||
5588 | error: | |
5589 | pthread_mutex_unlock(®istry->lock); | |
5590 | error_rcu_unlock: | |
5591 | rcu_read_unlock(); | |
5592 | return ret; | |
5593 | } | |
5594 | ||
d88aee68 DG |
5595 | /* |
5596 | * Handle application notification through the given notify socket. | |
5597 | * | |
5598 | * Return 0 on success or else a negative value. | |
5599 | */ | |
d0b96690 DG |
5600 | int ust_app_recv_notify(int sock) |
5601 | { | |
5602 | int ret; | |
5603 | enum ustctl_notify_cmd cmd; | |
5604 | ||
5605 | DBG3("UST app receiving notify from sock %d", sock); | |
5606 | ||
5607 | ret = ustctl_recv_notify(sock, &cmd); | |
5608 | if (ret < 0) { | |
5609 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5610 | ERR("UST app recv notify failed with ret %d", ret); | |
5611 | } else { | |
5612 | DBG3("UST app recv notify failed. Application died"); | |
5613 | } | |
5614 | goto error; | |
5615 | } | |
5616 | ||
5617 | switch (cmd) { | |
5618 | case USTCTL_NOTIFY_CMD_EVENT: | |
5619 | { | |
2106efa0 | 5620 | int sobjd, cobjd, loglevel_value; |
d0b96690 DG |
5621 | char name[LTTNG_UST_SYM_NAME_LEN], *sig, *model_emf_uri; |
5622 | size_t nr_fields; | |
5623 | struct ustctl_field *fields; | |
5624 | ||
5625 | DBG2("UST app ustctl register event received"); | |
5626 | ||
2106efa0 PP |
5627 | ret = ustctl_recv_register_event(sock, &sobjd, &cobjd, name, |
5628 | &loglevel_value, &sig, &nr_fields, &fields, | |
5629 | &model_emf_uri); | |
d0b96690 DG |
5630 | if (ret < 0) { |
5631 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5632 | ERR("UST app recv event failed with ret %d", ret); | |
5633 | } else { | |
5634 | DBG3("UST app recv event failed. Application died"); | |
5635 | } | |
5636 | goto error; | |
5637 | } | |
5638 | ||
d5d629b5 DG |
5639 | /* |
5640 | * Add event to the UST registry coming from the notify socket. This | |
5641 | * call will free if needed the sig, fields and model_emf_uri. This | |
5642 | * code path loses the ownsership of these variables and transfer them | |
5643 | * to the this function. | |
5644 | */ | |
d0b96690 | 5645 | ret = add_event_ust_registry(sock, sobjd, cobjd, name, sig, nr_fields, |
2106efa0 | 5646 | fields, loglevel_value, model_emf_uri); |
d0b96690 DG |
5647 | if (ret < 0) { |
5648 | goto error; | |
5649 | } | |
5650 | ||
5651 | break; | |
5652 | } | |
5653 | case USTCTL_NOTIFY_CMD_CHANNEL: | |
5654 | { | |
5655 | int sobjd, cobjd; | |
5656 | size_t nr_fields; | |
5657 | struct ustctl_field *fields; | |
5658 | ||
5659 | DBG2("UST app ustctl register channel received"); | |
5660 | ||
5661 | ret = ustctl_recv_register_channel(sock, &sobjd, &cobjd, &nr_fields, | |
5662 | &fields); | |
5663 | if (ret < 0) { | |
5664 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5665 | ERR("UST app recv channel failed with ret %d", ret); | |
5666 | } else { | |
5667 | DBG3("UST app recv channel failed. Application died"); | |
5668 | } | |
5669 | goto error; | |
5670 | } | |
5671 | ||
d5d629b5 DG |
5672 | /* |
5673 | * The fields ownership are transfered to this function call meaning | |
5674 | * that if needed it will be freed. After this, it's invalid to access | |
5675 | * fields or clean it up. | |
5676 | */ | |
d0b96690 DG |
5677 | ret = reply_ust_register_channel(sock, sobjd, cobjd, nr_fields, |
5678 | fields); | |
5679 | if (ret < 0) { | |
5680 | goto error; | |
5681 | } | |
5682 | ||
5683 | break; | |
5684 | } | |
10b56aef MD |
5685 | case USTCTL_NOTIFY_CMD_ENUM: |
5686 | { | |
5687 | int sobjd; | |
5688 | char name[LTTNG_UST_SYM_NAME_LEN]; | |
5689 | size_t nr_entries; | |
5690 | struct ustctl_enum_entry *entries; | |
5691 | ||
5692 | DBG2("UST app ustctl register enum received"); | |
5693 | ||
5694 | ret = ustctl_recv_register_enum(sock, &sobjd, name, | |
5695 | &entries, &nr_entries); | |
5696 | if (ret < 0) { | |
5697 | if (ret != -EPIPE && ret != -LTTNG_UST_ERR_EXITING) { | |
5698 | ERR("UST app recv enum failed with ret %d", ret); | |
5699 | } else { | |
5700 | DBG3("UST app recv enum failed. Application died"); | |
5701 | } | |
5702 | goto error; | |
5703 | } | |
5704 | ||
5705 | /* Callee assumes ownership of entries */ | |
5706 | ret = add_enum_ust_registry(sock, sobjd, name, | |
5707 | entries, nr_entries); | |
5708 | if (ret < 0) { | |
5709 | goto error; | |
5710 | } | |
5711 | ||
5712 | break; | |
5713 | } | |
d0b96690 DG |
5714 | default: |
5715 | /* Should NEVER happen. */ | |
5716 | assert(0); | |
5717 | } | |
5718 | ||
5719 | error: | |
5720 | return ret; | |
5721 | } | |
d88aee68 DG |
5722 | |
5723 | /* | |
5724 | * Once the notify socket hangs up, this is called. First, it tries to find the | |
5725 | * corresponding application. On failure, the call_rcu to close the socket is | |
5726 | * executed. If an application is found, it tries to delete it from the notify | |
5727 | * socket hash table. Whathever the result, it proceeds to the call_rcu. | |
5728 | * | |
5729 | * Note that an object needs to be allocated here so on ENOMEM failure, the | |
5730 | * call RCU is not done but the rest of the cleanup is. | |
5731 | */ | |
5732 | void ust_app_notify_sock_unregister(int sock) | |
5733 | { | |
5734 | int err_enomem = 0; | |
5735 | struct lttng_ht_iter iter; | |
5736 | struct ust_app *app; | |
5737 | struct ust_app_notify_sock_obj *obj; | |
5738 | ||
5739 | assert(sock >= 0); | |
5740 | ||
5741 | rcu_read_lock(); | |
5742 | ||
5743 | obj = zmalloc(sizeof(*obj)); | |
5744 | if (!obj) { | |
5745 | /* | |
5746 | * An ENOMEM is kind of uncool. If this strikes we continue the | |
5747 | * procedure but the call_rcu will not be called. In this case, we | |
5748 | * accept the fd leak rather than possibly creating an unsynchronized | |
5749 | * state between threads. | |
5750 | * | |
5751 | * TODO: The notify object should be created once the notify socket is | |
5752 | * registered and stored independantely from the ust app object. The | |
5753 | * tricky part is to synchronize the teardown of the application and | |
5754 | * this notify object. Let's keep that in mind so we can avoid this | |
5755 | * kind of shenanigans with ENOMEM in the teardown path. | |
5756 | */ | |
5757 | err_enomem = 1; | |
5758 | } else { | |
5759 | obj->fd = sock; | |
5760 | } | |
5761 | ||
5762 | DBG("UST app notify socket unregister %d", sock); | |
5763 | ||
5764 | /* | |
5765 | * Lookup application by notify socket. If this fails, this means that the | |
5766 | * hash table delete has already been done by the application | |
5767 | * unregistration process so we can safely close the notify socket in a | |
5768 | * call RCU. | |
5769 | */ | |
5770 | app = find_app_by_notify_sock(sock); | |
5771 | if (!app) { | |
5772 | goto close_socket; | |
5773 | } | |
5774 | ||
5775 | iter.iter.node = &app->notify_sock_n.node; | |
5776 | ||
5777 | /* | |
5778 | * Whatever happens here either we fail or succeed, in both cases we have | |
5779 | * to close the socket after a grace period to continue to the call RCU | |
5780 | * here. If the deletion is successful, the application is not visible | |
5781 | * anymore by other threads and is it fails it means that it was already | |
5782 | * deleted from the hash table so either way we just have to close the | |
5783 | * socket. | |
5784 | */ | |
5785 | (void) lttng_ht_del(ust_app_ht_by_notify_sock, &iter); | |
5786 | ||
5787 | close_socket: | |
5788 | rcu_read_unlock(); | |
5789 | ||
5790 | /* | |
5791 | * Close socket after a grace period to avoid for the socket to be reused | |
5792 | * before the application object is freed creating potential race between | |
5793 | * threads trying to add unique in the global hash table. | |
5794 | */ | |
5795 | if (!err_enomem) { | |
5796 | call_rcu(&obj->head, close_notify_sock_rcu); | |
5797 | } | |
5798 | } | |
f45e313d DG |
5799 | |
5800 | /* | |
5801 | * Destroy a ust app data structure and free its memory. | |
5802 | */ | |
5803 | void ust_app_destroy(struct ust_app *app) | |
5804 | { | |
5805 | if (!app) { | |
5806 | return; | |
5807 | } | |
5808 | ||
5809 | call_rcu(&app->pid_n.head, delete_ust_app_rcu); | |
5810 | } | |
6dc3064a DG |
5811 | |
5812 | /* | |
5813 | * Take a snapshot for a given UST session. The snapshot is sent to the given | |
5814 | * output. | |
5815 | * | |
5816 | * Return 0 on success or else a negative value. | |
5817 | */ | |
5818 | int ust_app_snapshot_record(struct ltt_ust_session *usess, | |
d07ceecd MD |
5819 | struct snapshot_output *output, int wait, |
5820 | uint64_t nb_packets_per_stream) | |
6dc3064a DG |
5821 | { |
5822 | int ret = 0; | |
5823 | struct lttng_ht_iter iter; | |
5824 | struct ust_app *app; | |
af706bb7 | 5825 | char pathname[PATH_MAX]; |
6dc3064a DG |
5826 | |
5827 | assert(usess); | |
5828 | assert(output); | |
5829 | ||
5830 | rcu_read_lock(); | |
5831 | ||
8c924c7b MD |
5832 | switch (usess->buffer_type) { |
5833 | case LTTNG_BUFFER_PER_UID: | |
5834 | { | |
5835 | struct buffer_reg_uid *reg; | |
6dc3064a | 5836 | |
8c924c7b MD |
5837 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { |
5838 | struct buffer_reg_channel *reg_chan; | |
5839 | struct consumer_socket *socket; | |
6dc3064a | 5840 | |
8c924c7b MD |
5841 | /* Get consumer socket to use to push the metadata.*/ |
5842 | socket = consumer_find_socket_by_bitness(reg->bits_per_long, | |
5843 | usess->consumer); | |
5844 | if (!socket) { | |
5845 | ret = -EINVAL; | |
5846 | goto error; | |
5847 | } | |
6dc3064a | 5848 | |
8c924c7b MD |
5849 | memset(pathname, 0, sizeof(pathname)); |
5850 | ret = snprintf(pathname, sizeof(pathname), | |
5851 | DEFAULT_UST_TRACE_DIR "/" DEFAULT_UST_TRACE_UID_PATH, | |
5852 | reg->uid, reg->bits_per_long); | |
5853 | if (ret < 0) { | |
5854 | PERROR("snprintf snapshot path"); | |
5855 | goto error; | |
5856 | } | |
5857 | ||
5858 | /* Add the UST default trace dir to path. */ | |
5859 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, | |
5860 | reg_chan, node.node) { | |
68808f4e DG |
5861 | ret = consumer_snapshot_channel(socket, reg_chan->consumer_key, |
5862 | output, 0, usess->uid, usess->gid, pathname, wait, | |
d07ceecd | 5863 | nb_packets_per_stream); |
8c924c7b MD |
5864 | if (ret < 0) { |
5865 | goto error; | |
5866 | } | |
5867 | } | |
68808f4e DG |
5868 | ret = consumer_snapshot_channel(socket, |
5869 | reg->registry->reg.ust->metadata_key, output, 1, | |
d07ceecd | 5870 | usess->uid, usess->gid, pathname, wait, 0); |
8c924c7b MD |
5871 | if (ret < 0) { |
5872 | goto error; | |
5873 | } | |
af706bb7 | 5874 | } |
8c924c7b MD |
5875 | break; |
5876 | } | |
5877 | case LTTNG_BUFFER_PER_PID: | |
5878 | { | |
5879 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5880 | struct consumer_socket *socket; | |
5881 | struct lttng_ht_iter chan_iter; | |
5882 | struct ust_app_channel *ua_chan; | |
5883 | struct ust_app_session *ua_sess; | |
5884 | struct ust_registry_session *registry; | |
5885 | ||
5886 | ua_sess = lookup_session_by_app(usess, app); | |
5887 | if (!ua_sess) { | |
5888 | /* Session not associated with this app. */ | |
5889 | continue; | |
5890 | } | |
af706bb7 | 5891 | |
8c924c7b MD |
5892 | /* Get the right consumer socket for the application. */ |
5893 | socket = consumer_find_socket_by_bitness(app->bits_per_long, | |
5894 | output->consumer); | |
5895 | if (!socket) { | |
5c786ded | 5896 | ret = -EINVAL; |
5c786ded JD |
5897 | goto error; |
5898 | } | |
5899 | ||
8c924c7b MD |
5900 | /* Add the UST default trace dir to path. */ |
5901 | memset(pathname, 0, sizeof(pathname)); | |
5902 | ret = snprintf(pathname, sizeof(pathname), DEFAULT_UST_TRACE_DIR "/%s", | |
5903 | ua_sess->path); | |
6dc3064a | 5904 | if (ret < 0) { |
8c924c7b | 5905 | PERROR("snprintf snapshot path"); |
6dc3064a DG |
5906 | goto error; |
5907 | } | |
6dc3064a | 5908 | |
8c924c7b MD |
5909 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, |
5910 | ua_chan, node.node) { | |
68808f4e DG |
5911 | ret = consumer_snapshot_channel(socket, ua_chan->key, output, |
5912 | 0, ua_sess->euid, ua_sess->egid, pathname, wait, | |
d07ceecd | 5913 | nb_packets_per_stream); |
8c924c7b MD |
5914 | if (ret < 0) { |
5915 | goto error; | |
5916 | } | |
5917 | } | |
5918 | ||
5919 | registry = get_session_registry(ua_sess); | |
5920 | assert(registry); | |
5921 | ret = consumer_snapshot_channel(socket, registry->metadata_key, output, | |
d07ceecd | 5922 | 1, ua_sess->euid, ua_sess->egid, pathname, wait, 0); |
8c924c7b MD |
5923 | if (ret < 0) { |
5924 | goto error; | |
5925 | } | |
5926 | } | |
5927 | break; | |
5928 | } | |
5929 | default: | |
5930 | assert(0); | |
5931 | break; | |
6dc3064a DG |
5932 | } |
5933 | ||
5934 | error: | |
5935 | rcu_read_unlock(); | |
5936 | return ret; | |
5937 | } | |
5c786ded JD |
5938 | |
5939 | /* | |
d07ceecd | 5940 | * Return the size taken by one more packet per stream. |
5c786ded | 5941 | */ |
d07ceecd MD |
5942 | uint64_t ust_app_get_size_one_more_packet_per_stream(struct ltt_ust_session *usess, |
5943 | uint64_t cur_nr_packets) | |
5c786ded | 5944 | { |
d07ceecd | 5945 | uint64_t tot_size = 0; |
5c786ded JD |
5946 | struct ust_app *app; |
5947 | struct lttng_ht_iter iter; | |
5948 | ||
5949 | assert(usess); | |
5950 | ||
5951 | switch (usess->buffer_type) { | |
5952 | case LTTNG_BUFFER_PER_UID: | |
5953 | { | |
5954 | struct buffer_reg_uid *reg; | |
5955 | ||
5956 | cds_list_for_each_entry(reg, &usess->buffer_reg_uid_list, lnode) { | |
5957 | struct buffer_reg_channel *reg_chan; | |
5958 | ||
b7064eaa | 5959 | rcu_read_lock(); |
5c786ded JD |
5960 | cds_lfht_for_each_entry(reg->registry->channels->ht, &iter.iter, |
5961 | reg_chan, node.node) { | |
d07ceecd MD |
5962 | if (cur_nr_packets >= reg_chan->num_subbuf) { |
5963 | /* | |
5964 | * Don't take channel into account if we | |
5965 | * already grab all its packets. | |
5966 | */ | |
5967 | continue; | |
5968 | } | |
5969 | tot_size += reg_chan->subbuf_size * reg_chan->stream_count; | |
5c786ded | 5970 | } |
b7064eaa | 5971 | rcu_read_unlock(); |
5c786ded JD |
5972 | } |
5973 | break; | |
5974 | } | |
5975 | case LTTNG_BUFFER_PER_PID: | |
5976 | { | |
5977 | rcu_read_lock(); | |
5978 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
5979 | struct ust_app_channel *ua_chan; | |
5980 | struct ust_app_session *ua_sess; | |
5981 | struct lttng_ht_iter chan_iter; | |
5982 | ||
5983 | ua_sess = lookup_session_by_app(usess, app); | |
5984 | if (!ua_sess) { | |
5985 | /* Session not associated with this app. */ | |
5986 | continue; | |
5987 | } | |
5988 | ||
5989 | cds_lfht_for_each_entry(ua_sess->channels->ht, &chan_iter.iter, | |
5990 | ua_chan, node.node) { | |
d07ceecd MD |
5991 | if (cur_nr_packets >= ua_chan->attr.num_subbuf) { |
5992 | /* | |
5993 | * Don't take channel into account if we | |
5994 | * already grab all its packets. | |
5995 | */ | |
5996 | continue; | |
5997 | } | |
5998 | tot_size += ua_chan->attr.subbuf_size * ua_chan->streams.count; | |
5c786ded JD |
5999 | } |
6000 | } | |
6001 | rcu_read_unlock(); | |
6002 | break; | |
6003 | } | |
6004 | default: | |
6005 | assert(0); | |
6006 | break; | |
6007 | } | |
6008 | ||
d07ceecd | 6009 | return tot_size; |
5c786ded | 6010 | } |
fb83fe64 JD |
6011 | |
6012 | int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id, | |
6013 | struct cds_list_head *buffer_reg_uid_list, | |
6014 | struct consumer_output *consumer, uint64_t uchan_id, | |
6015 | int overwrite, uint64_t *discarded, uint64_t *lost) | |
6016 | { | |
6017 | int ret; | |
6018 | uint64_t consumer_chan_key; | |
6019 | ||
6020 | ret = buffer_reg_uid_consumer_channel_key( | |
6021 | buffer_reg_uid_list, ust_session_id, | |
6022 | uchan_id, &consumer_chan_key); | |
6023 | if (ret < 0) { | |
6024 | goto end; | |
6025 | } | |
6026 | ||
6027 | if (overwrite) { | |
6028 | ret = consumer_get_lost_packets(ust_session_id, | |
6029 | consumer_chan_key, consumer, lost); | |
7c79cc89 | 6030 | *discarded = 0; |
fb83fe64 JD |
6031 | } else { |
6032 | ret = consumer_get_discarded_events(ust_session_id, | |
6033 | consumer_chan_key, consumer, discarded); | |
7c79cc89 | 6034 | *lost = 0; |
fb83fe64 JD |
6035 | } |
6036 | ||
6037 | end: | |
6038 | return ret; | |
6039 | } | |
6040 | ||
6041 | int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess, | |
6042 | struct ltt_ust_channel *uchan, | |
6043 | struct consumer_output *consumer, int overwrite, | |
6044 | uint64_t *discarded, uint64_t *lost) | |
6045 | { | |
6046 | int ret = 0; | |
6047 | struct lttng_ht_iter iter; | |
6048 | struct lttng_ht_node_str *ua_chan_node; | |
6049 | struct ust_app *app; | |
6050 | struct ust_app_session *ua_sess; | |
6051 | struct ust_app_channel *ua_chan; | |
6052 | ||
6053 | rcu_read_lock(); | |
6054 | /* | |
6055 | * Iterate over every registered applications, return when we | |
6056 | * found one in the right session and channel. | |
6057 | */ | |
6058 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6059 | struct lttng_ht_iter uiter; | |
6060 | ||
6061 | ua_sess = lookup_session_by_app(usess, app); | |
6062 | if (ua_sess == NULL) { | |
6063 | continue; | |
6064 | } | |
6065 | ||
6066 | /* Get channel */ | |
ee022399 | 6067 | lttng_ht_lookup(ua_sess->channels, (void *) uchan->name, &uiter); |
fb83fe64 JD |
6068 | ua_chan_node = lttng_ht_iter_get_node_str(&uiter); |
6069 | /* If the session is found for the app, the channel must be there */ | |
6070 | assert(ua_chan_node); | |
6071 | ||
6072 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); | |
6073 | ||
6074 | if (overwrite) { | |
6075 | ret = consumer_get_lost_packets(usess->id, ua_chan->key, | |
6076 | consumer, lost); | |
7c79cc89 | 6077 | *discarded = 0; |
fb83fe64 JD |
6078 | goto end; |
6079 | } else { | |
6080 | ret = consumer_get_discarded_events(usess->id, | |
6081 | ua_chan->key, consumer, discarded); | |
7c79cc89 | 6082 | *lost = 0; |
fb83fe64 JD |
6083 | goto end; |
6084 | } | |
fb83fe64 JD |
6085 | } |
6086 | ||
6087 | end: | |
6088 | rcu_read_unlock(); | |
6089 | return ret; | |
6090 | } | |
c2561365 JD |
6091 | |
6092 | static | |
6093 | int ust_app_regenerate_statedump(struct ltt_ust_session *usess, | |
6094 | struct ust_app *app) | |
6095 | { | |
6096 | int ret = 0; | |
6097 | struct ust_app_session *ua_sess; | |
6098 | ||
6099 | DBG("Regenerating the metadata for ust app pid %d", app->pid); | |
6100 | ||
6101 | rcu_read_lock(); | |
6102 | ||
6103 | ua_sess = lookup_session_by_app(usess, app); | |
6104 | if (ua_sess == NULL) { | |
6105 | /* The session is in teardown process. Ignore and continue. */ | |
6106 | goto end; | |
6107 | } | |
6108 | ||
6109 | pthread_mutex_lock(&ua_sess->lock); | |
6110 | ||
6111 | if (ua_sess->deleted) { | |
6112 | goto end_unlock; | |
6113 | } | |
6114 | ||
6115 | pthread_mutex_lock(&app->sock_lock); | |
6116 | ret = ustctl_regenerate_statedump(app->sock, ua_sess->handle); | |
6117 | pthread_mutex_unlock(&app->sock_lock); | |
6118 | ||
6119 | end_unlock: | |
6120 | pthread_mutex_unlock(&ua_sess->lock); | |
6121 | ||
6122 | end: | |
6123 | rcu_read_unlock(); | |
6124 | health_code_update(); | |
6125 | return ret; | |
6126 | } | |
6127 | ||
6128 | /* | |
6129 | * Regenerate the statedump for each app in the session. | |
6130 | */ | |
6131 | int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess) | |
6132 | { | |
6133 | int ret = 0; | |
6134 | struct lttng_ht_iter iter; | |
6135 | struct ust_app *app; | |
6136 | ||
6137 | DBG("Regenerating the metadata for all UST apps"); | |
6138 | ||
6139 | rcu_read_lock(); | |
6140 | ||
6141 | cds_lfht_for_each_entry(ust_app_ht->ht, &iter.iter, app, pid_n.node) { | |
6142 | if (!app->compatible) { | |
6143 | continue; | |
6144 | } | |
6145 | ||
6146 | ret = ust_app_regenerate_statedump(usess, app); | |
6147 | if (ret < 0) { | |
6148 | /* Continue to the next app even on error */ | |
6149 | continue; | |
6150 | } | |
6151 | } | |
6152 | ||
6153 | rcu_read_unlock(); | |
6154 | ||
6155 | return 0; | |
6156 | } |