Commit | Line | Data |
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8020ceb5 | 1 | /* |
c0c0989a | 2 | * SPDX-License-Identifier: LGPL-2.1-only |
8020ceb5 | 3 | * |
e92f3e28 MD |
4 | * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
5 | * | |
c0c0989a | 6 | * Holds LTTng per-session event registry. |
8020ceb5 MD |
7 | */ |
8 | ||
3fbec7dc | 9 | #define _LGPL_SOURCE |
b5234c06 | 10 | #include <stdio.h> |
d8d2416d | 11 | #include <assert.h> |
b5234c06 | 12 | #include <errno.h> |
d8d2416d FD |
13 | #include <limits.h> |
14 | #include <pthread.h> | |
f4681817 MD |
15 | #include <sys/shm.h> |
16 | #include <sys/ipc.h> | |
44c72f10 MD |
17 | #include <stdint.h> |
18 | #include <stddef.h> | |
28b12049 MD |
19 | #include <inttypes.h> |
20 | #include <time.h> | |
196ec2df | 21 | #include <stdbool.h> |
d8d2416d | 22 | #include <unistd.h> |
10544ee8 | 23 | #include <dlfcn.h> |
2ae57758 | 24 | #include <lttng/ust-endian.h> |
44c72f10 | 25 | |
d8d2416d | 26 | #include <urcu/arch.h> |
44c72f10 | 27 | #include <urcu/compiler.h> |
d8d2416d FD |
28 | #include <urcu/hlist.h> |
29 | #include <urcu/list.h> | |
44c72f10 | 30 | #include <urcu/uatomic.h> |
44c72f10 MD |
31 | |
32 | #include <lttng/tracepoint.h> | |
4318ae1b | 33 | #include <lttng/ust-events.h> |
44c72f10 MD |
34 | |
35 | #include <usterr-signal-safe.h> | |
864a1eda | 36 | #include <ust-helper.h> |
7d3e35b6 | 37 | #include <lttng/ust-ctl.h> |
32ce8569 | 38 | #include <ust-comm.h> |
d8d2416d | 39 | #include <ust-fd.h> |
ae4b659d MJ |
40 | #include <ust-dynamic-type.h> |
41 | #include <ust-context-provider.h> | |
1f18504e | 42 | #include "error.h" |
08114193 | 43 | #include "compat.h" |
eda498b8 | 44 | #include "lttng-ust-uuid.h" |
44c72f10 | 45 | |
457a6b58 | 46 | #include "tracepoint-internal.h" |
196ec2df | 47 | #include "string-utils.h" |
4d451c15 | 48 | #include "lttng-bytecode.h" |
7dd08bec MD |
49 | #include "lttng-tracer.h" |
50 | #include "lttng-tracer-core.h" | |
cf73e0fe | 51 | #include "lttng-ust-statedump.h" |
51f804ec | 52 | #include "context-internal.h" |
d871c65b | 53 | #include "ust-events-internal.h" |
b728d87e | 54 | #include "wait.h" |
8d8a24c8 | 55 | #include "../libringbuffer/shm.h" |
ebabbf58 | 56 | #include "../libcounter/counter.h" |
596c4223 | 57 | #include "jhash.h" |
d8d2416d | 58 | #include <lttng/ust-abi.h> |
8165c8da MD |
59 | |
60 | /* | |
3327ac33 MD |
61 | * All operations within this file are called by the communication |
62 | * thread, under ust_lock protection. | |
8165c8da | 63 | */ |
8165c8da | 64 | |
b5234c06 | 65 | static CDS_LIST_HEAD(sessions); |
d8d2416d | 66 | static CDS_LIST_HEAD(event_notifier_groups); |
8165c8da | 67 | |
7753d283 | 68 | struct cds_list_head *lttng_get_sessions(void) |
37dddb65 MD |
69 | { |
70 | return &sessions; | |
71 | } | |
72 | ||
7dd08bec | 73 | static void _lttng_event_destroy(struct lttng_event *event); |
d8d2416d FD |
74 | static void _lttng_event_notifier_destroy( |
75 | struct lttng_event_notifier *event_notifier); | |
c785c634 | 76 | static void _lttng_enum_destroy(struct lttng_enum *_enum); |
8020ceb5 | 77 | |
e58095ef | 78 | static |
d871c65b | 79 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session); |
e58095ef | 80 | static |
d871c65b | 81 | void lttng_session_sync_event_enablers(struct lttng_session *session); |
e58095ef | 82 | static |
d8d2416d FD |
83 | void lttng_event_notifier_group_sync_enablers( |
84 | struct lttng_event_notifier_group *event_notifier_group); | |
85 | static | |
e58095ef MD |
86 | void lttng_enabler_destroy(struct lttng_enabler *enabler); |
87 | ||
6715d7d1 MD |
88 | /* |
89 | * Called with ust lock held. | |
90 | */ | |
91 | int lttng_session_active(void) | |
92 | { | |
bdb12629 | 93 | struct lttng_ust_session_private *iter; |
6715d7d1 MD |
94 | |
95 | cds_list_for_each_entry(iter, &sessions, node) { | |
bdb12629 | 96 | if (iter->pub->active) |
6715d7d1 MD |
97 | return 1; |
98 | } | |
99 | return 0; | |
100 | } | |
101 | ||
e58095ef MD |
102 | static |
103 | int lttng_loglevel_match(int loglevel, | |
104 | unsigned int has_loglevel, | |
457a6b58 MD |
105 | enum lttng_ust_loglevel_type req_type, |
106 | int req_loglevel) | |
107 | { | |
e58095ef MD |
108 | if (!has_loglevel) |
109 | loglevel = TRACE_DEFAULT; | |
457a6b58 MD |
110 | switch (req_type) { |
111 | case LTTNG_UST_LOGLEVEL_RANGE: | |
aacb3774 | 112 | if (loglevel <= req_loglevel |
67ada458 | 113 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
114 | return 1; |
115 | else | |
116 | return 0; | |
117 | case LTTNG_UST_LOGLEVEL_SINGLE: | |
aacb3774 | 118 | if (loglevel == req_loglevel |
67ada458 | 119 | || (req_loglevel == -1 && loglevel <= TRACE_DEBUG)) |
457a6b58 MD |
120 | return 1; |
121 | else | |
122 | return 0; | |
123 | case LTTNG_UST_LOGLEVEL_ALL: | |
124 | default: | |
67ada458 | 125 | if (loglevel <= TRACE_DEBUG) |
aacb3774 MD |
126 | return 1; |
127 | else | |
128 | return 0; | |
457a6b58 MD |
129 | } |
130 | } | |
131 | ||
7dd08bec | 132 | struct lttng_session *lttng_session_create(void) |
8020ceb5 | 133 | { |
7dd08bec | 134 | struct lttng_session *session; |
bdb12629 | 135 | struct lttng_ust_session_private *session_priv; |
74d81a6c | 136 | int i; |
8020ceb5 | 137 | |
7dd08bec | 138 | session = zmalloc(sizeof(struct lttng_session)); |
8020ceb5 MD |
139 | if (!session) |
140 | return NULL; | |
bdb12629 MD |
141 | session_priv = zmalloc(sizeof(struct lttng_ust_session_private)); |
142 | if (!session_priv) { | |
53569322 MD |
143 | free(session); |
144 | return NULL; | |
145 | } | |
bdb12629 MD |
146 | session->priv = session_priv; |
147 | session_priv->pub = session; | |
148 | if (lttng_context_init_all(&session->priv->ctx)) { | |
149 | free(session_priv); | |
150 | free(session); | |
151 | return NULL; | |
152 | } | |
153 | CDS_INIT_LIST_HEAD(&session->priv->chan_head); | |
154 | CDS_INIT_LIST_HEAD(&session->priv->events_head); | |
155 | CDS_INIT_LIST_HEAD(&session->priv->enums_head); | |
156 | CDS_INIT_LIST_HEAD(&session->priv->enablers_head); | |
d56fa719 | 157 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
bdb12629 | 158 | CDS_INIT_HLIST_HEAD(&session->priv->events_ht.table[i]); |
c785c634 | 159 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
bdb12629 MD |
160 | CDS_INIT_HLIST_HEAD(&session->priv->enums_ht.table[i]); |
161 | cds_list_add(&session->priv->node, &sessions); | |
8020ceb5 MD |
162 | return session; |
163 | } | |
164 | ||
ebabbf58 MD |
165 | struct lttng_counter *lttng_ust_counter_create( |
166 | const char *counter_transport_name, | |
167 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
168 | { | |
169 | struct lttng_counter_transport *counter_transport = NULL; | |
170 | struct lttng_counter *counter = NULL; | |
171 | ||
172 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
173 | if (!counter_transport) | |
174 | goto notransport; | |
175 | counter = zmalloc(sizeof(struct lttng_counter)); | |
176 | if (!counter) | |
177 | goto nomem; | |
178 | ||
179 | counter->ops = &counter_transport->ops; | |
180 | counter->transport = counter_transport; | |
181 | ||
182 | counter->counter = counter->ops->counter_create( | |
183 | number_dimensions, dimensions, 0, | |
184 | -1, 0, NULL, false); | |
185 | if (!counter->counter) { | |
186 | goto create_error; | |
187 | } | |
188 | ||
189 | return counter; | |
190 | ||
191 | create_error: | |
192 | free(counter); | |
193 | nomem: | |
194 | notransport: | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | static | |
199 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
200 | { | |
201 | counter->ops->counter_destroy(counter->counter); | |
202 | free(counter); | |
203 | } | |
204 | ||
d8d2416d FD |
205 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
206 | { | |
207 | struct lttng_event_notifier_group *event_notifier_group; | |
208 | int i; | |
209 | ||
210 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
211 | if (!event_notifier_group) | |
212 | return NULL; | |
213 | ||
51f804ec FD |
214 | /* Add all contexts. */ |
215 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
216 | free(event_notifier_group); | |
217 | return NULL; | |
218 | } | |
219 | ||
d8d2416d FD |
220 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
221 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
222 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
223 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
224 | ||
225 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
226 | ||
227 | return event_notifier_group; | |
228 | } | |
229 | ||
74d81a6c MD |
230 | /* |
231 | * Only used internally at session destruction. | |
232 | */ | |
233 | static | |
234 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
235 | { | |
236 | struct channel *chan; | |
237 | struct lttng_ust_shm_handle *handle; | |
238 | ||
239 | cds_list_del(<tng_chan->node); | |
240 | lttng_destroy_context(lttng_chan->ctx); | |
241 | chan = lttng_chan->chan; | |
242 | handle = lttng_chan->handle; | |
243 | /* | |
244 | * note: lttng_chan is private data contained within handle. It | |
245 | * will be freed along with the handle. | |
246 | */ | |
247 | channel_destroy(chan, handle, 0); | |
248 | } | |
249 | ||
ac6b4ac6 MD |
250 | static |
251 | void register_event(struct lttng_event *event) | |
252 | { | |
253 | int ret; | |
254 | const struct lttng_event_desc *desc; | |
255 | ||
68bb7559 MD |
256 | assert(event->priv->registered == 0); |
257 | desc = event->priv->desc; | |
baa1e0bc | 258 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
259 | desc->probe_callback, |
260 | event, desc->signature); | |
261 | WARN_ON_ONCE(ret); | |
262 | if (!ret) | |
68bb7559 | 263 | event->priv->registered = 1; |
ac6b4ac6 MD |
264 | } |
265 | ||
d8d2416d FD |
266 | static |
267 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
268 | { | |
269 | int ret; | |
270 | const struct lttng_event_desc *desc; | |
271 | ||
272 | assert(event_notifier->registered == 0); | |
273 | desc = event_notifier->desc; | |
274 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
275 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
276 | WARN_ON_ONCE(ret); | |
277 | if (!ret) | |
278 | event_notifier->registered = 1; | |
279 | } | |
280 | ||
ac6b4ac6 MD |
281 | static |
282 | void unregister_event(struct lttng_event *event) | |
283 | { | |
284 | int ret; | |
285 | const struct lttng_event_desc *desc; | |
286 | ||
68bb7559 MD |
287 | assert(event->priv->registered == 1); |
288 | desc = event->priv->desc; | |
baa1e0bc | 289 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
290 | desc->probe_callback, |
291 | event); | |
292 | WARN_ON_ONCE(ret); | |
293 | if (!ret) | |
68bb7559 | 294 | event->priv->registered = 0; |
ac6b4ac6 MD |
295 | } |
296 | ||
d8d2416d FD |
297 | static |
298 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
299 | { | |
300 | int ret; | |
301 | const struct lttng_event_desc *desc; | |
302 | ||
303 | assert(event_notifier->registered == 1); | |
304 | desc = event_notifier->desc; | |
305 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
306 | desc->u.ext.event_notifier_callback, event_notifier); | |
307 | WARN_ON_ONCE(ret); | |
308 | if (!ret) | |
309 | event_notifier->registered = 0; | |
310 | } | |
311 | ||
ac6b4ac6 MD |
312 | /* |
313 | * Only used internally at session destruction. | |
314 | */ | |
315 | static | |
316 | void _lttng_event_unregister(struct lttng_event *event) | |
317 | { | |
68bb7559 | 318 | if (event->priv->registered) |
ac6b4ac6 MD |
319 | unregister_event(event); |
320 | } | |
321 | ||
d8d2416d FD |
322 | /* |
323 | * Only used internally at session destruction. | |
324 | */ | |
325 | static | |
326 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
327 | { | |
328 | if (event_notifier->registered) | |
329 | unregister_event_notifier(event_notifier); | |
330 | } | |
331 | ||
7dd08bec | 332 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 333 | { |
7dd08bec | 334 | struct lttng_channel *chan, *tmpchan; |
68bb7559 | 335 | struct lttng_ust_event_private *event_priv, *tmpevent_priv; |
c785c634 | 336 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 337 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 338 | |
b5234c06 | 339 | CMM_ACCESS_ONCE(session->active) = 0; |
bdb12629 | 340 | cds_list_for_each_entry(event_priv, &session->priv->events_head, node) { |
68bb7559 | 341 | _lttng_event_unregister(event_priv->pub); |
8020ceb5 | 342 | } |
b653ddc1 | 343 | lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */ |
baa1e0bc | 344 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 345 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
bdb12629 | 346 | &session->priv->enablers_head, node) |
d871c65b | 347 | lttng_event_enabler_destroy(event_enabler); |
68bb7559 | 348 | cds_list_for_each_entry_safe(event_priv, tmpevent_priv, |
bdb12629 | 349 | &session->priv->events_head, node) |
68bb7559 | 350 | _lttng_event_destroy(event_priv->pub); |
c785c634 | 351 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
bdb12629 | 352 | &session->priv->enums_head, node) |
c785c634 | 353 | _lttng_enum_destroy(_enum); |
bdb12629 | 354 | cds_list_for_each_entry_safe(chan, tmpchan, &session->priv->chan_head, node) |
74d81a6c | 355 | _lttng_channel_unmap(chan); |
bdb12629 MD |
356 | cds_list_del(&session->priv->node); |
357 | lttng_destroy_context(session->priv->ctx); | |
358 | free(session->priv); | |
b5234c06 | 359 | free(session); |
8020ceb5 MD |
360 | } |
361 | ||
d8d2416d FD |
362 | void lttng_event_notifier_group_destroy( |
363 | struct lttng_event_notifier_group *event_notifier_group) | |
364 | { | |
365 | int close_ret; | |
366 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
367 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
368 | ||
369 | if (!event_notifier_group) { | |
370 | return; | |
371 | } | |
372 | ||
373 | cds_list_for_each_entry(notifier, | |
374 | &event_notifier_group->event_notifiers_head, node) | |
375 | _lttng_event_notifier_unregister(notifier); | |
376 | ||
b653ddc1 | 377 | lttng_ust_urcu_synchronize_rcu(); |
d8d2416d FD |
378 | |
379 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
380 | &event_notifier_group->enablers_head, node) | |
381 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
382 | ||
383 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
384 | &event_notifier_group->event_notifiers_head, node) | |
385 | _lttng_event_notifier_destroy(notifier); | |
386 | ||
ebabbf58 MD |
387 | if (event_notifier_group->error_counter) |
388 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
389 | ||
390 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
391 | |
392 | lttng_ust_lock_fd_tracker(); | |
393 | close_ret = close(event_notifier_group->notification_fd); | |
394 | if (!close_ret) { | |
395 | lttng_ust_delete_fd_from_tracker( | |
396 | event_notifier_group->notification_fd); | |
397 | } else { | |
398 | PERROR("close"); | |
399 | abort(); | |
400 | } | |
401 | lttng_ust_unlock_fd_tracker(); | |
402 | ||
403 | cds_list_del(&event_notifier_group->node); | |
404 | ||
405 | free(event_notifier_group); | |
406 | } | |
407 | ||
d871c65b FD |
408 | static |
409 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
410 | { | |
ab249ecf | 411 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
412 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
413 | ||
414 | if (!enabler) { | |
415 | return; | |
416 | } | |
417 | ||
418 | /* Destroy filter bytecode */ | |
419 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
420 | &enabler->filter_bytecode_head, node) { | |
421 | free(filter_node); | |
422 | } | |
423 | ||
424 | /* Destroy excluders */ | |
425 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
426 | &enabler->excluder_head, node) { | |
427 | free(excluder_node); | |
428 | } | |
429 | } | |
430 | ||
d8d2416d FD |
431 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
432 | { | |
433 | if (!event_notifier_enabler) { | |
434 | return; | |
435 | } | |
436 | ||
437 | cds_list_del(&event_notifier_enabler->node); | |
438 | ||
439 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
440 | ||
441 | free(event_notifier_enabler); | |
442 | } | |
443 | ||
53569322 MD |
444 | static |
445 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
446 | struct lttng_session *session) | |
447 | { | |
448 | const char *enum_name = desc->name; | |
449 | struct lttng_enum *_enum; | |
450 | struct cds_hlist_head *head; | |
53569322 MD |
451 | int ret = 0; |
452 | size_t name_len = strlen(enum_name); | |
453 | uint32_t hash; | |
454 | int notify_socket; | |
455 | ||
b33b46f7 | 456 | /* Check if this enum is already registered for this session. */ |
53569322 | 457 | hash = jhash(enum_name, name_len, 0); |
bdb12629 | 458 | head = &session->priv->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; |
b33b46f7 FD |
459 | |
460 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
461 | if (_enum) { | |
462 | ret = -EEXIST; | |
463 | goto exist; | |
53569322 MD |
464 | } |
465 | ||
bdb12629 | 466 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
53569322 MD |
467 | if (notify_socket < 0) { |
468 | ret = notify_socket; | |
469 | goto socket_error; | |
470 | } | |
471 | ||
472 | _enum = zmalloc(sizeof(*_enum)); | |
473 | if (!_enum) { | |
474 | ret = -ENOMEM; | |
475 | goto cache_error; | |
476 | } | |
477 | _enum->session = session; | |
478 | _enum->desc = desc; | |
479 | ||
480 | ret = ustcomm_register_enum(notify_socket, | |
bdb12629 | 481 | session->priv->objd, |
53569322 MD |
482 | enum_name, |
483 | desc->nr_entries, | |
484 | desc->entries, | |
485 | &_enum->id); | |
486 | if (ret < 0) { | |
487 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
488 | goto sessiond_register_error; | |
489 | } | |
bdb12629 | 490 | cds_list_add(&_enum->node, &session->priv->enums_head); |
53569322 MD |
491 | cds_hlist_add_head(&_enum->hlist, head); |
492 | return 0; | |
493 | ||
494 | sessiond_register_error: | |
495 | free(_enum); | |
496 | cache_error: | |
497 | socket_error: | |
498 | exist: | |
499 | return ret; | |
500 | } | |
501 | ||
502 | static | |
503 | int lttng_create_enum_check(const struct lttng_type *type, | |
504 | struct lttng_session *session) | |
505 | { | |
506 | switch (type->atype) { | |
507 | case atype_enum: | |
508 | { | |
509 | const struct lttng_enum_desc *enum_desc; | |
510 | int ret; | |
511 | ||
218deb69 MD |
512 | enum_desc = type->u.legacy.basic.enumeration.desc; |
513 | ret = lttng_enum_create(enum_desc, session); | |
514 | if (ret && ret != -EEXIST) { | |
515 | DBG("Unable to create enum error: (%d)", ret); | |
516 | return ret; | |
517 | } | |
518 | break; | |
519 | } | |
520 | case atype_enum_nestable: | |
521 | { | |
522 | const struct lttng_enum_desc *enum_desc; | |
523 | int ret; | |
524 | ||
525 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
526 | ret = lttng_enum_create(enum_desc, session); |
527 | if (ret && ret != -EEXIST) { | |
528 | DBG("Unable to create enum error: (%d)", ret); | |
529 | return ret; | |
530 | } | |
531 | break; | |
532 | } | |
533 | case atype_dynamic: | |
534 | { | |
535 | const struct lttng_event_field *tag_field_generic; | |
536 | const struct lttng_enum_desc *enum_desc; | |
537 | int ret; | |
538 | ||
539 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 540 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
541 | ret = lttng_enum_create(enum_desc, session); |
542 | if (ret && ret != -EEXIST) { | |
543 | DBG("Unable to create enum error: (%d)", ret); | |
544 | return ret; | |
545 | } | |
546 | break; | |
547 | } | |
548 | default: | |
549 | /* TODO: nested types when they become supported. */ | |
550 | break; | |
551 | } | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static | |
556 | int lttng_create_all_event_enums(size_t nr_fields, | |
557 | const struct lttng_event_field *event_fields, | |
558 | struct lttng_session *session) | |
559 | { | |
560 | size_t i; | |
561 | int ret; | |
562 | ||
563 | /* For each field, ensure enum is part of the session. */ | |
564 | for (i = 0; i < nr_fields; i++) { | |
565 | const struct lttng_type *type = &event_fields[i].type; | |
566 | ||
567 | ret = lttng_create_enum_check(type, session); | |
568 | if (ret) | |
569 | return ret; | |
570 | } | |
571 | return 0; | |
572 | } | |
573 | ||
574 | static | |
575 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
576 | const struct lttng_ctx_field *ctx_fields, | |
577 | struct lttng_session *session) | |
578 | { | |
579 | size_t i; | |
580 | int ret; | |
581 | ||
582 | /* For each field, ensure enum is part of the session. */ | |
583 | for (i = 0; i < nr_fields; i++) { | |
584 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
585 | ||
586 | ret = lttng_create_enum_check(type, session); | |
587 | if (ret) | |
588 | return ret; | |
589 | } | |
590 | return 0; | |
591 | } | |
592 | ||
710b8ee3 MD |
593 | /* |
594 | * Ensure that a state-dump will be performed for this session at the end | |
595 | * of the current handle_message(). | |
596 | */ | |
597 | int lttng_session_statedump(struct lttng_session *session) | |
598 | { | |
bdb12629 MD |
599 | session->priv->statedump_pending = 1; |
600 | lttng_ust_sockinfo_session_enabled(session->priv->owner); | |
710b8ee3 MD |
601 | return 0; |
602 | } | |
53569322 | 603 | |
7dd08bec | 604 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
605 | { |
606 | int ret = 0; | |
7dd08bec | 607 | struct lttng_channel *chan; |
32ce8569 | 608 | int notify_socket; |
8020ceb5 | 609 | |
8020ceb5 MD |
610 | if (session->active) { |
611 | ret = -EBUSY; | |
612 | goto end; | |
613 | } | |
614 | ||
bdb12629 | 615 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
32ce8569 MD |
616 | if (notify_socket < 0) |
617 | return notify_socket; | |
618 | ||
ac6b4ac6 | 619 | /* Set transient enabler state to "enabled" */ |
bdb12629 | 620 | session->priv->tstate = 1; |
e58095ef | 621 | |
3ff7660f | 622 | /* We need to sync enablers with session before activation. */ |
d871c65b | 623 | lttng_session_sync_event_enablers(session); |
3ff7660f | 624 | |
8020ceb5 MD |
625 | /* |
626 | * Snapshot the number of events per channel to know the type of header | |
627 | * we need to use. | |
628 | */ | |
bdb12629 | 629 | cds_list_for_each_entry(chan, &session->priv->chan_head, node) { |
32ce8569 | 630 | const struct lttng_ctx *ctx; |
83e43212 | 631 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 632 | size_t nr_fields = 0; |
6ca18e66 | 633 | uint32_t chan_id; |
32ce8569 MD |
634 | |
635 | /* don't change it if session stop/restart */ | |
8020ceb5 | 636 | if (chan->header_type) |
32ce8569 MD |
637 | continue; |
638 | ctx = chan->ctx; | |
639 | if (ctx) { | |
640 | nr_fields = ctx->nr_fields; | |
83e43212 | 641 | fields = ctx->fields; |
53569322 MD |
642 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
643 | session); | |
644 | if (ret < 0) { | |
645 | DBG("Error (%d) adding enum to session", ret); | |
646 | return ret; | |
647 | } | |
32ce8569 MD |
648 | } |
649 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 650 | session, |
bdb12629 | 651 | session->priv->objd, |
32ce8569 MD |
652 | chan->objd, |
653 | nr_fields, | |
654 | fields, | |
6ca18e66 | 655 | &chan_id, |
32ce8569 | 656 | &chan->header_type); |
b869b5ae MD |
657 | if (ret) { |
658 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 659 | return ret; |
b869b5ae | 660 | } |
6ca18e66 MD |
661 | if (chan_id != chan->id) { |
662 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
663 | chan_id, chan->id); | |
664 | return -EINVAL; | |
665 | } | |
8020ceb5 MD |
666 | } |
667 | ||
ac6b4ac6 | 668 | /* Set atomically the state to "active" */ |
b5234c06 | 669 | CMM_ACCESS_ONCE(session->active) = 1; |
bdb12629 | 670 | CMM_ACCESS_ONCE(session->priv->been_active) = 1; |
95c25348 | 671 | |
710b8ee3 MD |
672 | ret = lttng_session_statedump(session); |
673 | if (ret) | |
674 | return ret; | |
8020ceb5 | 675 | end: |
8020ceb5 MD |
676 | return ret; |
677 | } | |
678 | ||
7dd08bec | 679 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
680 | { |
681 | int ret = 0; | |
682 | ||
8020ceb5 MD |
683 | if (!session->active) { |
684 | ret = -EBUSY; | |
685 | goto end; | |
686 | } | |
ac6b4ac6 | 687 | /* Set atomically the state to "inactive" */ |
b5234c06 | 688 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
689 | |
690 | /* Set transient enabler state to "disabled" */ | |
bdb12629 | 691 | session->priv->tstate = 0; |
d871c65b | 692 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 693 | end: |
8020ceb5 MD |
694 | return ret; |
695 | } | |
696 | ||
7dd08bec | 697 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 698 | { |
ac6b4ac6 | 699 | int ret = 0; |
976fe9ea | 700 | |
ac6b4ac6 MD |
701 | if (channel->enabled) { |
702 | ret = -EBUSY; | |
703 | goto end; | |
704 | } | |
705 | /* Set transient enabler state to "enabled" */ | |
706 | channel->tstate = 1; | |
d871c65b | 707 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
708 | /* Set atomically the state to "enabled" */ |
709 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
710 | end: | |
711 | return ret; | |
976fe9ea MD |
712 | } |
713 | ||
7dd08bec | 714 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 715 | { |
ac6b4ac6 | 716 | int ret = 0; |
976fe9ea | 717 | |
ac6b4ac6 MD |
718 | if (!channel->enabled) { |
719 | ret = -EBUSY; | |
720 | goto end; | |
721 | } | |
722 | /* Set atomically the state to "disabled" */ | |
723 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
724 | /* Set transient enabler state to "enabled" */ | |
725 | channel->tstate = 0; | |
d871c65b | 726 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
727 | end: |
728 | return ret; | |
976fe9ea MD |
729 | } |
730 | ||
fb470188 FD |
731 | static inline |
732 | struct cds_hlist_head *borrow_hash_table_bucket( | |
733 | struct cds_hlist_head *hash_table, | |
734 | unsigned int hash_table_size, | |
735 | const struct lttng_event_desc *desc) | |
736 | { | |
737 | const char *event_name; | |
738 | size_t name_len; | |
739 | uint32_t hash; | |
740 | ||
741 | event_name = desc->name; | |
742 | name_len = strlen(event_name); | |
743 | ||
744 | hash = jhash(event_name, name_len, 0); | |
745 | return &hash_table[hash & (hash_table_size - 1)]; | |
746 | } | |
747 | ||
8020ceb5 MD |
748 | /* |
749 | * Supports event creation while tracing session is active. | |
750 | */ | |
e58095ef MD |
751 | static |
752 | int lttng_event_create(const struct lttng_event_desc *desc, | |
753 | struct lttng_channel *chan) | |
8020ceb5 | 754 | { |
7dd08bec | 755 | struct lttng_event *event; |
68bb7559 | 756 | struct lttng_ust_event_private *event_priv; |
32ce8569 | 757 | struct lttng_session *session = chan->session; |
d56fa719 | 758 | struct cds_hlist_head *head; |
576599a0 | 759 | int ret = 0; |
32ce8569 MD |
760 | int notify_socket, loglevel; |
761 | const char *uri; | |
8020ceb5 | 762 | |
bdb12629 | 763 | head = borrow_hash_table_bucket(chan->session->priv->events_ht.table, |
fb470188 | 764 | LTTNG_UST_EVENT_HT_SIZE, desc); |
457a6b58 | 765 | |
bdb12629 | 766 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
32ce8569 MD |
767 | if (notify_socket < 0) { |
768 | ret = notify_socket; | |
769 | goto socket_error; | |
770 | } | |
771 | ||
53569322 MD |
772 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
773 | session); | |
c785c634 MD |
774 | if (ret < 0) { |
775 | DBG("Error (%d) adding enum to session", ret); | |
776 | goto create_enum_error; | |
777 | } | |
778 | ||
457a6b58 MD |
779 | /* |
780 | * Check if loglevel match. Refuse to connect event if not. | |
781 | */ | |
7dd08bec | 782 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
783 | if (!event) { |
784 | ret = -ENOMEM; | |
8020ceb5 | 785 | goto cache_error; |
576599a0 | 786 | } |
74579d3b | 787 | event->struct_size = sizeof(struct lttng_event); |
68bb7559 MD |
788 | event_priv = zmalloc(sizeof(struct lttng_ust_event_private)); |
789 | if (!event_priv) { | |
790 | ret = -ENOMEM; | |
791 | goto priv_error; | |
792 | } | |
793 | event->priv = event_priv; | |
794 | event_priv->pub = event; | |
8020ceb5 | 795 | event->chan = chan; |
e58095ef | 796 | |
ac6b4ac6 MD |
797 | /* Event will be enabled by enabler sync. */ |
798 | event->enabled = 0; | |
68bb7559 | 799 | event->priv->registered = 0; |
a56fd376 | 800 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
68bb7559 MD |
801 | CDS_INIT_LIST_HEAD(&event->priv->enablers_ref_head); |
802 | event->priv->desc = desc; | |
32ce8569 MD |
803 | |
804 | if (desc->loglevel) | |
68bb7559 | 805 | loglevel = *(*event->priv->desc->loglevel); |
32ce8569 MD |
806 | else |
807 | loglevel = TRACE_DEFAULT; | |
808 | if (desc->u.ext.model_emf_uri) | |
809 | uri = *(desc->u.ext.model_emf_uri); | |
810 | else | |
811 | uri = NULL; | |
812 | ||
13b21cd6 MD |
813 | /* Fetch event ID from sessiond */ |
814 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 815 | session, |
bdb12629 | 816 | session->priv->objd, |
13b21cd6 | 817 | chan->objd, |
fb470188 | 818 | desc->name, |
13b21cd6 MD |
819 | loglevel, |
820 | desc->signature, | |
821 | desc->nr_fields, | |
822 | desc->fields, | |
823 | uri, | |
824 | &event->id); | |
825 | if (ret < 0) { | |
826 | DBG("Error (%d) registering event to sessiond", ret); | |
827 | goto sessiond_register_error; | |
32ce8569 | 828 | } |
2b213b16 | 829 | |
bdb12629 | 830 | cds_list_add(&event->priv->node, &chan->session->priv->events_head); |
68bb7559 | 831 | cds_hlist_add_head(&event->priv->hlist, head); |
576599a0 | 832 | return 0; |
8020ceb5 | 833 | |
32ce8569 | 834 | sessiond_register_error: |
68bb7559 MD |
835 | free(event_priv); |
836 | priv_error: | |
b5234c06 | 837 | free(event); |
8020ceb5 | 838 | cache_error: |
c785c634 | 839 | create_enum_error: |
32ce8569 | 840 | socket_error: |
576599a0 | 841 | return ret; |
8020ceb5 MD |
842 | } |
843 | ||
d8d2416d FD |
844 | static |
845 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
6566528b | 846 | uint64_t token, uint64_t error_counter_index, |
d8d2416d FD |
847 | struct lttng_event_notifier_group *event_notifier_group) |
848 | { | |
849 | struct lttng_event_notifier *event_notifier; | |
850 | struct cds_hlist_head *head; | |
851 | int ret = 0; | |
852 | ||
853 | /* | |
854 | * Get the hashtable bucket the created lttng_event_notifier object | |
855 | * should be inserted. | |
856 | */ | |
857 | head = borrow_hash_table_bucket( | |
858 | event_notifier_group->event_notifiers_ht.table, | |
859 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
860 | ||
861 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
862 | if (!event_notifier) { | |
863 | ret = -ENOMEM; | |
864 | goto error; | |
865 | } | |
866 | ||
867 | event_notifier->group = event_notifier_group; | |
868 | event_notifier->user_token = token; | |
6566528b | 869 | event_notifier->error_counter_index = error_counter_index; |
d8d2416d FD |
870 | |
871 | /* Event notifier will be enabled by enabler sync. */ | |
872 | event_notifier->enabled = 0; | |
873 | event_notifier->registered = 0; | |
874 | ||
875 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
d37ecb3f | 876 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
d8d2416d FD |
877 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
878 | event_notifier->desc = desc; | |
cab88ff8 | 879 | event_notifier->notification_send = lttng_event_notifier_notification_send; |
d8d2416d FD |
880 | |
881 | cds_list_add(&event_notifier->node, | |
882 | &event_notifier_group->event_notifiers_head); | |
883 | cds_hlist_add_head(&event_notifier->hlist, head); | |
884 | ||
885 | return 0; | |
886 | ||
887 | error: | |
888 | return ret; | |
889 | } | |
890 | ||
891 | static | |
892 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
893 | { | |
894 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
895 | ||
896 | /* Remove from event_notifier list. */ | |
897 | cds_list_del(&event_notifier->node); | |
898 | /* Remove from event_notifier hash table. */ | |
899 | cds_hlist_del(&event_notifier->hlist); | |
900 | ||
901 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
902 | ||
903 | /* Free event_notifier enabler refs */ | |
904 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
905 | &event_notifier->enablers_ref_head, node) | |
906 | free(enabler_ref); | |
907 | free(event_notifier); | |
908 | } | |
909 | ||
e58095ef | 910 | static |
196ec2df | 911 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
912 | struct lttng_enabler *enabler) |
913 | { | |
914 | int loglevel = 0; | |
7e2e405c | 915 | unsigned int has_loglevel = 0; |
e58095ef | 916 | |
e450e339 | 917 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
918 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
919 | desc->name, SIZE_MAX)) | |
e58095ef MD |
920 | return 0; |
921 | if (desc->loglevel) { | |
922 | loglevel = *(*desc->loglevel); | |
923 | has_loglevel = 1; | |
924 | } | |
925 | if (!lttng_loglevel_match(loglevel, | |
926 | has_loglevel, | |
927 | enabler->event_param.loglevel_type, | |
928 | enabler->event_param.loglevel)) | |
929 | return 0; | |
930 | return 1; | |
931 | } | |
932 | ||
933 | static | |
934 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
935 | struct lttng_enabler *enabler) | |
936 | { | |
937 | int loglevel = 0; | |
938 | unsigned int has_loglevel = 0; | |
939 | ||
e450e339 | 940 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
941 | if (strcmp(desc->name, enabler->event_param.name)) |
942 | return 0; | |
943 | if (desc->loglevel) { | |
944 | loglevel = *(*desc->loglevel); | |
945 | has_loglevel = 1; | |
946 | } | |
947 | if (!lttng_loglevel_match(loglevel, | |
948 | has_loglevel, | |
949 | enabler->event_param.loglevel_type, | |
950 | enabler->event_param.loglevel)) | |
951 | return 0; | |
952 | return 1; | |
953 | } | |
954 | ||
955 | static | |
956 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
957 | struct lttng_enabler *enabler) | |
958 | { | |
e450e339 FD |
959 | switch (enabler->format_type) { |
960 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
961 | { |
962 | struct lttng_ust_excluder_node *excluder; | |
963 | ||
964 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
965 | return 0; | |
966 | } | |
967 | ||
968 | /* | |
969 | * If the matching event matches with an excluder, | |
970 | * return 'does not match' | |
971 | */ | |
972 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
973 | int count; | |
974 | ||
975 | for (count = 0; count < excluder->excluder.count; count++) { | |
976 | int len; | |
977 | char *excluder_name; | |
978 | ||
979 | excluder_name = (char *) (excluder->excluder.names) | |
980 | + count * LTTNG_UST_SYM_NAME_LEN; | |
981 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 982 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 983 | return 0; |
ed5b5bbd JI |
984 | } |
985 | } | |
196ec2df | 986 | return 1; |
ed5b5bbd | 987 | } |
e450e339 | 988 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
989 | return lttng_desc_match_event_enabler(desc, enabler); |
990 | default: | |
991 | return -EINVAL; | |
992 | } | |
993 | } | |
994 | ||
995 | static | |
d871c65b FD |
996 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
997 | struct lttng_event *event) | |
e58095ef | 998 | { |
68bb7559 | 999 | if (lttng_desc_match_enabler(event->priv->desc, |
d871c65b FD |
1000 | lttng_event_enabler_as_enabler(event_enabler)) |
1001 | && event->chan == event_enabler->chan) | |
d970f72e MD |
1002 | return 1; |
1003 | else | |
1004 | return 0; | |
e58095ef MD |
1005 | } |
1006 | ||
d8d2416d FD |
1007 | static |
1008 | int lttng_event_notifier_enabler_match_event_notifier( | |
1009 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1010 | struct lttng_event_notifier *event_notifier) | |
1011 | { | |
1012 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
1013 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1014 | ||
1015 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
1016 | event_notifier->user_token == event_notifier_enabler->user_token) | |
1017 | return 1; | |
1018 | else | |
1019 | return 0; | |
1020 | } | |
1021 | ||
e58095ef | 1022 | static |
d871c65b FD |
1023 | struct lttng_enabler_ref *lttng_enabler_ref( |
1024 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1025 | struct lttng_enabler *enabler) |
1026 | { | |
1027 | struct lttng_enabler_ref *enabler_ref; | |
1028 | ||
d871c65b | 1029 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1030 | if (enabler_ref->ref == enabler) |
1031 | return enabler_ref; | |
1032 | } | |
1033 | return NULL; | |
1034 | } | |
1035 | ||
8020ceb5 | 1036 | /* |
e58095ef MD |
1037 | * Create struct lttng_event if it is missing and present in the list of |
1038 | * tracepoint probes. | |
8020ceb5 | 1039 | */ |
e58095ef | 1040 | static |
d871c65b | 1041 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1042 | { |
d871c65b | 1043 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1044 | struct lttng_probe_desc *probe_desc; |
1045 | const struct lttng_event_desc *desc; | |
68bb7559 | 1046 | struct lttng_ust_event_private *event_priv; |
e58095ef MD |
1047 | int i; |
1048 | struct cds_list_head *probe_list; | |
1049 | ||
1050 | probe_list = lttng_get_probe_list_head(); | |
1051 | /* | |
1052 | * For each probe event, if we find that a probe event matches | |
1053 | * our enabler, create an associated lttng_event if not | |
1054 | * already present. | |
1055 | */ | |
1056 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1057 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1058 | int ret; |
1059 | bool found = false; | |
d56fa719 MD |
1060 | struct cds_hlist_head *head; |
1061 | struct cds_hlist_node *node; | |
e58095ef MD |
1062 | |
1063 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1064 | if (!lttng_desc_match_enabler(desc, |
1065 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1066 | continue; |
1067 | ||
fb470188 | 1068 | head = borrow_hash_table_bucket( |
bdb12629 | 1069 | session->priv->events_ht.table, |
fb470188 FD |
1070 | LTTNG_UST_EVENT_HT_SIZE, desc); |
1071 | ||
68bb7559 MD |
1072 | cds_hlist_for_each_entry(event_priv, node, head, hlist) { |
1073 | if (event_priv->desc == desc | |
1074 | && event_priv->pub->chan == event_enabler->chan) { | |
98a97f24 | 1075 | found = true; |
3140bffe FD |
1076 | break; |
1077 | } | |
e58095ef MD |
1078 | } |
1079 | if (found) | |
1080 | continue; | |
1081 | ||
1082 | /* | |
1083 | * We need to create an event for this | |
1084 | * event probe. | |
1085 | */ | |
1086 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1087 | event_enabler->chan); |
e58095ef | 1088 | if (ret) { |
32ce8569 MD |
1089 | DBG("Unable to create event %s, error %d\n", |
1090 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1091 | } |
8165c8da | 1092 | } |
8020ceb5 | 1093 | } |
8020ceb5 MD |
1094 | } |
1095 | ||
a44d07da FD |
1096 | static |
1097 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1098 | void (*event_func)(struct lttng_session *session, |
1099 | struct lttng_event *event), | |
1100 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1101 | { |
1102 | struct cds_hlist_node *node, *tmp_node; | |
1103 | struct cds_list_head *sessionsp; | |
a44d07da | 1104 | unsigned int i; |
35ac38cb FD |
1105 | |
1106 | /* Get handle on list of sessions. */ | |
7753d283 | 1107 | sessionsp = lttng_get_sessions(); |
35ac38cb FD |
1108 | |
1109 | /* | |
a44d07da FD |
1110 | * Iterate over all events in the probe provider descriptions and |
1111 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1112 | */ |
1113 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1114 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1115 | struct lttng_event_notifier_group *event_notifier_group; |
1116 | struct lttng_event_notifier *event_notifier; | |
bdb12629 | 1117 | struct lttng_ust_session_private *session_priv; |
a44d07da | 1118 | struct cds_hlist_head *head; |
68bb7559 | 1119 | struct lttng_ust_event_private *event_priv; |
35ac38cb FD |
1120 | |
1121 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1122 | |
a44d07da FD |
1123 | /* |
1124 | * Iterate over all session to find the current event | |
1125 | * description. | |
1126 | */ | |
bdb12629 | 1127 | cds_list_for_each_entry(session_priv, sessionsp, node) { |
35ac38cb | 1128 | /* |
a44d07da FD |
1129 | * Get the list of events in the hashtable bucket and |
1130 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1131 | */ |
fb470188 | 1132 | head = borrow_hash_table_bucket( |
bdb12629 | 1133 | session_priv->events_ht.table, |
fb470188 FD |
1134 | LTTNG_UST_EVENT_HT_SIZE, event_desc); |
1135 | ||
68bb7559 MD |
1136 | cds_hlist_for_each_entry_safe(event_priv, node, tmp_node, head, hlist) { |
1137 | if (event_desc == event_priv->desc) { | |
bdb12629 | 1138 | event_func(session_priv->pub, event_priv->pub); |
35ac38cb FD |
1139 | break; |
1140 | } | |
1141 | } | |
1142 | } | |
d8d2416d FD |
1143 | |
1144 | /* | |
1145 | * Iterate over all event_notifier groups to find the current event | |
1146 | * description. | |
1147 | */ | |
1148 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1149 | /* | |
1150 | * Get the list of event_notifiers in the hashtable bucket and | |
1151 | * iterate to find the event_notifier matching this | |
1152 | * descriptor. | |
1153 | */ | |
1154 | head = borrow_hash_table_bucket( | |
1155 | event_notifier_group->event_notifiers_ht.table, | |
1156 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1157 | ||
1158 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1159 | if (event_desc == event_notifier->desc) { | |
1160 | event_notifier_func(event_notifier); | |
1161 | break; | |
1162 | } | |
1163 | } | |
1164 | } | |
35ac38cb | 1165 | } |
a44d07da FD |
1166 | } |
1167 | ||
1168 | static | |
1169 | void _unregister_event(struct lttng_session *session, | |
1170 | struct lttng_event *event) | |
1171 | { | |
1172 | _lttng_event_unregister(event); | |
1173 | } | |
1174 | ||
1175 | static | |
1176 | void _event_enum_destroy(struct lttng_session *session, | |
1177 | struct lttng_event *event) | |
1178 | { | |
1179 | unsigned int i; | |
1180 | ||
1181 | /* Destroy enums of the current event. */ | |
68bb7559 | 1182 | for (i = 0; i < event->priv->desc->nr_fields; i++) { |
a44d07da FD |
1183 | const struct lttng_enum_desc *enum_desc; |
1184 | const struct lttng_event_field *field; | |
1185 | struct lttng_enum *curr_enum; | |
1186 | ||
68bb7559 | 1187 | field = &(event->priv->desc->fields[i]); |
a44d07da FD |
1188 | switch (field->type.atype) { |
1189 | case atype_enum: | |
1190 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1191 | break; | |
1192 | case atype_enum_nestable: | |
1193 | enum_desc = field->type.u.enum_nestable.desc; | |
1194 | break; | |
1195 | default: | |
1196 | continue; | |
1197 | } | |
1198 | ||
1199 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1200 | if (curr_enum) { | |
1201 | _lttng_enum_destroy(curr_enum); | |
1202 | } | |
1203 | } | |
1204 | ||
1205 | /* Destroy event. */ | |
1206 | _lttng_event_destroy(event); | |
1207 | } | |
1208 | ||
1209 | /* | |
1210 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1211 | * the probe provider descriptor received as argument. Must me called with the | |
1212 | * ust_lock held. | |
1213 | */ | |
1214 | void lttng_probe_provider_unregister_events( | |
1215 | struct lttng_probe_desc *provider_desc) | |
1216 | { | |
1217 | /* | |
1218 | * Iterate over all events in the probe provider descriptions and sessions | |
1219 | * to queue the unregistration of the events. | |
1220 | */ | |
d8d2416d FD |
1221 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1222 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1223 | |
1224 | /* Wait for grace period. */ | |
b653ddc1 | 1225 | lttng_ust_urcu_synchronize_rcu(); |
35ac38cb FD |
1226 | /* Prune the unregistration queue. */ |
1227 | __tracepoint_probe_prune_release_queue(); | |
1228 | ||
1229 | /* | |
1230 | * It is now safe to destroy the events and remove them from the event list | |
1231 | * and hashtables. | |
1232 | */ | |
d8d2416d FD |
1233 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1234 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1235 | } |
1236 | ||
8020ceb5 | 1237 | /* |
d8d2416d | 1238 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1239 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1240 | */ |
1241 | static | |
d871c65b | 1242 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1243 | { |
d871c65b | 1244 | struct lttng_session *session = event_enabler->chan->session; |
68bb7559 | 1245 | struct lttng_ust_event_private *event_priv; |
e58095ef | 1246 | |
d871c65b | 1247 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1248 | goto end; |
1249 | ||
e58095ef | 1250 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1251 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1252 | |
1253 | /* For each event matching enabler in session event list. */ | |
bdb12629 | 1254 | cds_list_for_each_entry(event_priv, &session->priv->events_head, node) { |
e58095ef MD |
1255 | struct lttng_enabler_ref *enabler_ref; |
1256 | ||
68bb7559 | 1257 | if (!lttng_event_enabler_match_event(event_enabler, event_priv->pub)) |
e58095ef MD |
1258 | continue; |
1259 | ||
68bb7559 | 1260 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, |
d871c65b | 1261 | lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef MD |
1262 | if (!enabler_ref) { |
1263 | /* | |
1264 | * If no backward ref, create it. | |
1265 | * Add backward ref from event to enabler. | |
1266 | */ | |
1267 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1268 | if (!enabler_ref) | |
1269 | return -ENOMEM; | |
d871c65b FD |
1270 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1271 | event_enabler); | |
e58095ef | 1272 | cds_list_add(&enabler_ref->node, |
68bb7559 | 1273 | &event_priv->enablers_ref_head); |
8165c8da | 1274 | } |
e58095ef MD |
1275 | |
1276 | /* | |
1277 | * Link filter bytecodes if not linked yet. | |
1278 | */ | |
68bb7559 | 1279 | lttng_enabler_link_bytecode(event_priv->desc, |
bdb12629 | 1280 | &session->priv->ctx, |
68bb7559 | 1281 | &event_priv->pub->filter_bytecode_runtime_head, |
621c07fc | 1282 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1283 | |
1284 | /* TODO: merge event context. */ | |
1285 | } | |
de713d8a | 1286 | end: |
e58095ef MD |
1287 | return 0; |
1288 | } | |
1289 | ||
1290 | /* | |
1291 | * Called at library load: connect the probe on all enablers matching | |
1292 | * this event. | |
5f733922 | 1293 | * Called with session mutex held. |
e58095ef | 1294 | */ |
5f733922 | 1295 | int lttng_fix_pending_events(void) |
e58095ef | 1296 | { |
bdb12629 | 1297 | struct lttng_ust_session_private *session_priv; |
e58095ef | 1298 | |
bdb12629 MD |
1299 | cds_list_for_each_entry(session_priv, &sessions, node) { |
1300 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
8020ceb5 | 1301 | } |
e58095ef MD |
1302 | return 0; |
1303 | } | |
1304 | ||
d8d2416d FD |
1305 | int lttng_fix_pending_event_notifiers(void) |
1306 | { | |
1307 | struct lttng_event_notifier_group *event_notifier_group; | |
1308 | ||
1309 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1310 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1311 | } | |
1312 | return 0; | |
1313 | } | |
1314 | ||
246be17e | 1315 | /* |
37dddb65 MD |
1316 | * For each session of the owner thread, execute pending statedump. |
1317 | * Only dump state for the sessions owned by the caller thread, because | |
1318 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1319 | */ |
3327ac33 | 1320 | void lttng_handle_pending_statedump(void *owner) |
246be17e | 1321 | { |
bdb12629 | 1322 | struct lttng_ust_session_private *session_priv; |
246be17e | 1323 | |
37dddb65 | 1324 | /* Execute state dump */ |
cf73e0fe | 1325 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1326 | |
1327 | /* Clear pending state dump */ | |
3327ac33 MD |
1328 | if (ust_lock()) { |
1329 | goto end; | |
1330 | } | |
bdb12629 MD |
1331 | cds_list_for_each_entry(session_priv, &sessions, node) { |
1332 | if (session_priv->owner != owner) | |
37dddb65 | 1333 | continue; |
bdb12629 | 1334 | if (!session_priv->statedump_pending) |
37dddb65 | 1335 | continue; |
bdb12629 | 1336 | session_priv->statedump_pending = 0; |
246be17e | 1337 | } |
3327ac33 | 1338 | end: |
37dddb65 | 1339 | ust_unlock(); |
3327ac33 | 1340 | return; |
246be17e PW |
1341 | } |
1342 | ||
e58095ef MD |
1343 | /* |
1344 | * Only used internally at session destruction. | |
1345 | */ | |
1346 | static | |
1347 | void _lttng_event_destroy(struct lttng_event *event) | |
1348 | { | |
1349 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1350 | ||
35ac38cb | 1351 | /* Remove from event list. */ |
68bb7559 | 1352 | cds_list_del(&event->priv->node); |
35ac38cb | 1353 | /* Remove from event hash table. */ |
68bb7559 | 1354 | cds_hlist_del(&event->priv->hlist); |
35ac38cb | 1355 | |
8020ceb5 | 1356 | lttng_destroy_context(event->ctx); |
f488575f | 1357 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1358 | /* Free event enabler refs */ |
1359 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
68bb7559 | 1360 | &event->priv->enablers_ref_head, node) |
e58095ef | 1361 | free(enabler_ref); |
68bb7559 | 1362 | free(event->priv); |
b5234c06 | 1363 | free(event); |
8020ceb5 MD |
1364 | } |
1365 | ||
c785c634 MD |
1366 | static |
1367 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1368 | { | |
1369 | cds_list_del(&_enum->node); | |
35ac38cb | 1370 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1371 | free(_enum); |
1372 | } | |
1373 | ||
003fedf4 | 1374 | void lttng_ust_events_exit(void) |
8020ceb5 | 1375 | { |
bdb12629 | 1376 | struct lttng_ust_session_private *session_priv, *tmpsession_priv; |
8020ceb5 | 1377 | |
bdb12629 MD |
1378 | cds_list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, node) |
1379 | lttng_session_destroy(session_priv->pub); | |
8020ceb5 | 1380 | } |
457a6b58 | 1381 | |
e58095ef MD |
1382 | /* |
1383 | * Enabler management. | |
1384 | */ | |
d871c65b FD |
1385 | struct lttng_event_enabler *lttng_event_enabler_create( |
1386 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1387 | struct lttng_ust_event *event_param, |
1388 | struct lttng_channel *chan) | |
457a6b58 | 1389 | { |
d871c65b | 1390 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1391 | |
d871c65b FD |
1392 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1393 | if (!event_enabler) | |
e58095ef | 1394 | return NULL; |
d871c65b FD |
1395 | event_enabler->base.format_type = format_type; |
1396 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1397 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1398 | memcpy(&event_enabler->base.event_param, event_param, | |
1399 | sizeof(event_enabler->base.event_param)); | |
1400 | event_enabler->chan = chan; | |
e58095ef | 1401 | /* ctx left NULL */ |
d871c65b | 1402 | event_enabler->base.enabled = 0; |
bdb12629 | 1403 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->priv->enablers_head); |
d871c65b FD |
1404 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
1405 | ||
1406 | return event_enabler; | |
457a6b58 MD |
1407 | } |
1408 | ||
d8d2416d FD |
1409 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1410 | struct lttng_event_notifier_group *event_notifier_group, | |
1411 | enum lttng_enabler_format_type format_type, | |
1412 | struct lttng_ust_event_notifier *event_notifier_param) | |
1413 | { | |
1414 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1415 | ||
1416 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1417 | if (!event_notifier_enabler) | |
1418 | return NULL; | |
1419 | event_notifier_enabler->base.format_type = format_type; | |
1420 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1421 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1422 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1423 | ||
1424 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
9560f5eb | 1425 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
d37ecb3f | 1426 | event_notifier_enabler->num_captures = 0; |
d8d2416d FD |
1427 | |
1428 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1429 | event_notifier_param->event.name, | |
1430 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1431 | event_notifier_enabler->base.event_param.instrumentation = | |
1432 | event_notifier_param->event.instrumentation; | |
1433 | event_notifier_enabler->base.event_param.loglevel = | |
1434 | event_notifier_param->event.loglevel; | |
1435 | event_notifier_enabler->base.event_param.loglevel_type = | |
1436 | event_notifier_param->event.loglevel_type; | |
1437 | ||
1438 | event_notifier_enabler->base.enabled = 0; | |
1439 | event_notifier_enabler->group = event_notifier_group; | |
1440 | ||
1441 | cds_list_add(&event_notifier_enabler->node, | |
1442 | &event_notifier_group->enablers_head); | |
1443 | ||
1444 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1445 | ||
1446 | return event_notifier_enabler; | |
1447 | } | |
1448 | ||
d871c65b | 1449 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1450 | { |
d871c65b FD |
1451 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1452 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1453 | ||
e58095ef | 1454 | return 0; |
457a6b58 | 1455 | } |
457a6b58 | 1456 | |
d871c65b | 1457 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1458 | { |
d871c65b FD |
1459 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1460 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1461 | ||
e58095ef MD |
1462 | return 0; |
1463 | } | |
457a6b58 | 1464 | |
d871c65b | 1465 | static |
a56fd376 | 1466 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab89263e | 1467 | struct lttng_ust_bytecode_node **bytecode) |
e58095ef | 1468 | { |
ab89263e MD |
1469 | (*bytecode)->enabler = enabler; |
1470 | cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head); | |
1471 | /* Take ownership of bytecode */ | |
1472 | *bytecode = NULL; | |
d871c65b FD |
1473 | } |
1474 | ||
a56fd376 | 1475 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab89263e | 1476 | struct lttng_ust_bytecode_node **bytecode) |
d871c65b | 1477 | { |
a56fd376 | 1478 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1479 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1480 | ||
1481 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1482 | return 0; |
0bfb5cbd JI |
1483 | } |
1484 | ||
d871c65b FD |
1485 | static |
1486 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
e9fe6aad | 1487 | struct lttng_ust_excluder_node **excluder) |
0bfb5cbd | 1488 | { |
e9fe6aad MD |
1489 | (*excluder)->enabler = enabler; |
1490 | cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head); | |
1491 | /* Take ownership of excluder */ | |
1492 | *excluder = NULL; | |
d871c65b FD |
1493 | } |
1494 | ||
1495 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
e9fe6aad | 1496 | struct lttng_ust_excluder_node **excluder) |
d871c65b FD |
1497 | { |
1498 | _lttng_enabler_attach_exclusion( | |
1499 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1500 | ||
1501 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1502 | return 0; |
e58095ef | 1503 | } |
f488575f | 1504 | |
d8d2416d FD |
1505 | int lttng_event_notifier_enabler_enable( |
1506 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1507 | { | |
1508 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1509 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1510 | ||
1511 | return 0; | |
1512 | } | |
1513 | ||
1514 | int lttng_event_notifier_enabler_disable( | |
1515 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1516 | { | |
1517 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1518 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1519 | ||
1520 | return 0; | |
1521 | } | |
1522 | ||
a56fd376 | 1523 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1524 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab89263e | 1525 | struct lttng_ust_bytecode_node **bytecode) |
d8d2416d | 1526 | { |
a56fd376 | 1527 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1528 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1529 | bytecode); | |
1530 | ||
1531 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1532 | return 0; | |
1533 | } | |
1534 | ||
d37ecb3f FD |
1535 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1536 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
49cde654 | 1537 | struct lttng_ust_bytecode_node **bytecode) |
d37ecb3f | 1538 | { |
49cde654 | 1539 | (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler( |
d37ecb3f | 1540 | event_notifier_enabler); |
49cde654 | 1541 | cds_list_add_tail(&(*bytecode)->node, |
d37ecb3f | 1542 | &event_notifier_enabler->capture_bytecode_head); |
49cde654 MD |
1543 | /* Take ownership of bytecode */ |
1544 | *bytecode = NULL; | |
d37ecb3f FD |
1545 | event_notifier_enabler->num_captures++; |
1546 | ||
1547 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1548 | return 0; | |
1549 | } | |
1550 | ||
d8d2416d FD |
1551 | int lttng_event_notifier_enabler_attach_exclusion( |
1552 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
e9fe6aad | 1553 | struct lttng_ust_excluder_node **excluder) |
d8d2416d FD |
1554 | { |
1555 | _lttng_enabler_attach_exclusion( | |
1556 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1557 | excluder); | |
1558 | ||
1559 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1560 | return 0; | |
1561 | } | |
1562 | ||
e58095ef | 1563 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1564 | union ust_args *uargs, |
e58095ef MD |
1565 | struct lttng_ctx **ctx, struct lttng_session *session) |
1566 | { | |
457a6b58 | 1567 | /* |
e58095ef MD |
1568 | * We cannot attach a context after trace has been started for a |
1569 | * session because the metadata does not allow expressing this | |
1570 | * information outside of the original channel scope. | |
457a6b58 | 1571 | */ |
bdb12629 | 1572 | if (session->priv->been_active) |
e58095ef | 1573 | return -EPERM; |
457a6b58 | 1574 | |
e58095ef MD |
1575 | switch (context_param->ctx) { |
1576 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1577 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1578 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1579 | { | |
1580 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1581 | ||
1582 | perf_ctx_param = &context_param->u.perf_counter; | |
1583 | return lttng_add_perf_counter_to_ctx( | |
1584 | perf_ctx_param->type, | |
1585 | perf_ctx_param->config, | |
1586 | perf_ctx_param->name, | |
1587 | ctx); | |
1588 | } | |
e58095ef MD |
1589 | case LTTNG_UST_CONTEXT_VTID: |
1590 | return lttng_add_vtid_to_ctx(ctx); | |
1591 | case LTTNG_UST_CONTEXT_VPID: | |
1592 | return lttng_add_vpid_to_ctx(ctx); | |
1593 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1594 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1595 | case LTTNG_UST_CONTEXT_IP: |
1596 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1597 | case LTTNG_UST_CONTEXT_CPU_ID: |
1598 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1599 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1600 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1601 | ctx); | |
735bef47 MJ |
1602 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1603 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1604 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1605 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1606 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1607 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1608 | case LTTNG_UST_CONTEXT_NET_NS: | |
1609 | return lttng_add_net_ns_to_ctx(ctx); | |
1610 | case LTTNG_UST_CONTEXT_PID_NS: | |
1611 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1612 | case LTTNG_UST_CONTEXT_TIME_NS: |
1613 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1614 | case LTTNG_UST_CONTEXT_USER_NS: |
1615 | return lttng_add_user_ns_to_ctx(ctx); | |
1616 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1617 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1618 | case LTTNG_UST_CONTEXT_VUID: |
1619 | return lttng_add_vuid_to_ctx(ctx); | |
1620 | case LTTNG_UST_CONTEXT_VEUID: | |
1621 | return lttng_add_veuid_to_ctx(ctx); | |
1622 | case LTTNG_UST_CONTEXT_VSUID: | |
1623 | return lttng_add_vsuid_to_ctx(ctx); | |
1624 | case LTTNG_UST_CONTEXT_VGID: | |
1625 | return lttng_add_vgid_to_ctx(ctx); | |
1626 | case LTTNG_UST_CONTEXT_VEGID: | |
1627 | return lttng_add_vegid_to_ctx(ctx); | |
1628 | case LTTNG_UST_CONTEXT_VSGID: | |
1629 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1630 | default: |
1631 | return -EINVAL; | |
457a6b58 | 1632 | } |
457a6b58 MD |
1633 | } |
1634 | ||
d871c65b | 1635 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1636 | struct lttng_ust_context *context_param) |
457a6b58 | 1637 | { |
e58095ef | 1638 | return -ENOSYS; |
457a6b58 MD |
1639 | } |
1640 | ||
d871c65b | 1641 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1642 | { |
d871c65b FD |
1643 | if (!event_enabler) { |
1644 | return; | |
0f63324a | 1645 | } |
d871c65b | 1646 | cds_list_del(&event_enabler->node); |
0f63324a | 1647 | |
d871c65b | 1648 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1649 | |
d871c65b FD |
1650 | lttng_destroy_context(event_enabler->ctx); |
1651 | free(event_enabler); | |
457a6b58 MD |
1652 | } |
1653 | ||
e58095ef | 1654 | /* |
d871c65b | 1655 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1656 | * session. |
1657 | */ | |
457a6b58 | 1658 | static |
d871c65b | 1659 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1660 | { |
d871c65b | 1661 | struct lttng_event_enabler *event_enabler; |
68bb7559 | 1662 | struct lttng_ust_event_private *event_priv; |
457a6b58 | 1663 | |
bdb12629 | 1664 | cds_list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
d871c65b | 1665 | lttng_event_enabler_ref_events(event_enabler); |
e58095ef MD |
1666 | /* |
1667 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1668 | * and its channel and session transient states are enabled, we |
1669 | * enable the event, else we disable it. | |
e58095ef | 1670 | */ |
bdb12629 | 1671 | cds_list_for_each_entry(event_priv, &session->priv->events_head, node) { |
e58095ef MD |
1672 | struct lttng_enabler_ref *enabler_ref; |
1673 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1674 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1675 | |
1676 | /* Enable events */ | |
1677 | cds_list_for_each_entry(enabler_ref, | |
68bb7559 | 1678 | &event_priv->enablers_ref_head, node) { |
e58095ef MD |
1679 | if (enabler_ref->ref->enabled) { |
1680 | enabled = 1; | |
1681 | break; | |
1682 | } | |
1683 | } | |
ac6b4ac6 MD |
1684 | /* |
1685 | * Enabled state is based on union of enablers, with | |
1686 | * intesection of session and channel transient enable | |
1687 | * states. | |
1688 | */ | |
bdb12629 | 1689 | enabled = enabled && session->priv->tstate && event_priv->pub->chan->tstate; |
ac6b4ac6 | 1690 | |
68bb7559 | 1691 | CMM_STORE_SHARED(event_priv->pub->enabled, enabled); |
ac6b4ac6 MD |
1692 | /* |
1693 | * Sync tracepoint registration with event enabled | |
1694 | * state. | |
1695 | */ | |
1696 | if (enabled) { | |
68bb7559 MD |
1697 | if (!event_priv->registered) |
1698 | register_event(event_priv->pub); | |
ac6b4ac6 | 1699 | } else { |
68bb7559 MD |
1700 | if (event_priv->registered) |
1701 | unregister_event(event_priv->pub); | |
ac6b4ac6 | 1702 | } |
457a6b58 | 1703 | |
1f49fc05 | 1704 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 | 1705 | cds_list_for_each_entry(enabler_ref, |
68bb7559 | 1706 | &event_priv->enablers_ref_head, node) { |
1f49fc05 MD |
1707 | if (enabler_ref->ref->enabled |
1708 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1709 | has_enablers_without_bytecode = 1; |
1710 | break; | |
1711 | } | |
1712 | } | |
68bb7559 | 1713 | event_priv->pub->has_enablers_without_bytecode = |
dcdeaff0 MD |
1714 | has_enablers_without_bytecode; |
1715 | ||
e58095ef MD |
1716 | /* Enable filters */ |
1717 | cds_list_for_each_entry(runtime, | |
68bb7559 | 1718 | &event_priv->pub->filter_bytecode_runtime_head, node) { |
4d451c15 | 1719 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1720 | } |
1721 | } | |
baa1e0bc | 1722 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1723 | } |
1724 | ||
4296085e MD |
1725 | /* Support for event notifier is introduced by probe provider major version 2. */ |
1726 | static | |
1727 | bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc) | |
1728 | { | |
1729 | return probe_desc->major >= 2; | |
1730 | } | |
1731 | ||
d8d2416d FD |
1732 | static |
1733 | void lttng_create_event_notifier_if_missing( | |
1734 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1735 | { | |
1736 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1737 | struct lttng_probe_desc *probe_desc; | |
1738 | struct cds_list_head *probe_list; | |
1739 | int i; | |
1740 | ||
1741 | probe_list = lttng_get_probe_list_head(); | |
1742 | ||
1743 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1744 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1745 | int ret; | |
1746 | bool found = false; | |
1747 | const struct lttng_event_desc *desc; | |
1748 | struct lttng_event_notifier *event_notifier; | |
1749 | struct cds_hlist_head *head; | |
1750 | struct cds_hlist_node *node; | |
1751 | ||
1752 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1753 | |
d8d2416d FD |
1754 | if (!lttng_desc_match_enabler(desc, |
1755 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1756 | continue; | |
1757 | ||
1758 | /* | |
1759 | * Given the current event_notifier group, get the bucket that | |
1760 | * the target event_notifier would be if it was already | |
1761 | * created. | |
1762 | */ | |
1763 | head = borrow_hash_table_bucket( | |
1764 | event_notifier_group->event_notifiers_ht.table, | |
1765 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1766 | ||
1767 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1768 | /* | |
1769 | * Check if event_notifier already exists by checking | |
1770 | * if the event_notifier and enabler share the same | |
1771 | * description and id. | |
1772 | */ | |
1773 | if (event_notifier->desc == desc && | |
1774 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1775 | found = true; | |
1776 | break; | |
1777 | } | |
1778 | } | |
1779 | ||
1780 | if (found) | |
1781 | continue; | |
1782 | ||
4296085e MD |
1783 | /* Check that the probe supports event notifiers, else report the error. */ |
1784 | if (!lttng_ust_probe_supports_event_notifier(probe_desc)) { | |
1785 | ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, " | |
1786 | "but its version (%u.%u) is too old and does not implement event notifiers. " | |
1787 | "It needs to be recompiled against a newer version of LTTng-UST, otherwise " | |
1788 | "this event will not generate any notification.", | |
1789 | probe_desc->provider, | |
1790 | desc->name, | |
1791 | probe_desc->major, | |
1792 | probe_desc->minor); | |
1793 | continue; | |
1794 | } | |
d8d2416d FD |
1795 | /* |
1796 | * We need to create a event_notifier for this event probe. | |
1797 | */ | |
1798 | ret = lttng_event_notifier_create(desc, | |
1799 | event_notifier_enabler->user_token, | |
6566528b | 1800 | event_notifier_enabler->error_counter_index, |
d8d2416d FD |
1801 | event_notifier_group); |
1802 | if (ret) { | |
1803 | DBG("Unable to create event_notifier %s, error %d\n", | |
1804 | probe_desc->event_desc[i]->name, ret); | |
1805 | } | |
1806 | } | |
1807 | } | |
1808 | } | |
1809 | ||
1810 | /* | |
1811 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1812 | */ | |
1813 | static | |
1814 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1815 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1816 | { | |
1817 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1818 | struct lttng_event_notifier *event_notifier; | |
1819 | ||
1820 | /* | |
1821 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1822 | * might still be attaching filter or exclusion to the | |
1823 | * event_notifier_enabler. | |
1824 | */ | |
1825 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1826 | goto end; | |
1827 | ||
1828 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1829 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1830 | ||
1831 | /* Link the created event_notifier with its associated enabler. */ | |
1832 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1833 | struct lttng_enabler_ref *enabler_ref; | |
1834 | ||
1835 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1836 | continue; | |
1837 | ||
1838 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1839 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1840 | if (!enabler_ref) { | |
1841 | /* | |
1842 | * If no backward ref, create it. | |
1843 | * Add backward ref from event_notifier to enabler. | |
1844 | */ | |
1845 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1846 | if (!enabler_ref) | |
1847 | return -ENOMEM; | |
1848 | ||
1849 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1850 | event_notifier_enabler); | |
1851 | cds_list_add(&enabler_ref->node, | |
1852 | &event_notifier->enablers_ref_head); | |
1853 | } | |
1854 | ||
1855 | /* | |
1856 | * Link filter bytecodes if not linked yet. | |
1857 | */ | |
1858 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1859 | &event_notifier_group->ctx, |
1860 | &event_notifier->filter_bytecode_runtime_head, | |
1861 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d37ecb3f FD |
1862 | |
1863 | /* | |
1864 | * Link capture bytecodes if not linked yet. | |
1865 | */ | |
1866 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1867 | &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head, | |
1868 | &event_notifier_enabler->capture_bytecode_head); | |
1869 | ||
1870 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
d8d2416d FD |
1871 | } |
1872 | end: | |
1873 | return 0; | |
1874 | } | |
1875 | ||
1876 | static | |
1877 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1878 | { | |
1879 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1880 | struct lttng_event_notifier *event_notifier; | |
1881 | ||
1882 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1883 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1884 | ||
1885 | /* | |
1886 | * For each event_notifier, if at least one of its enablers is enabled, | |
1887 | * we enable the event_notifier, else we disable it. | |
1888 | */ | |
1889 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1890 | struct lttng_enabler_ref *enabler_ref; | |
1891 | struct lttng_bytecode_runtime *runtime; | |
1892 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1893 | ||
1894 | /* Enable event_notifiers */ | |
1895 | cds_list_for_each_entry(enabler_ref, | |
1896 | &event_notifier->enablers_ref_head, node) { | |
1897 | if (enabler_ref->ref->enabled) { | |
1898 | enabled = 1; | |
1899 | break; | |
1900 | } | |
1901 | } | |
1902 | ||
1903 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1904 | /* | |
1905 | * Sync tracepoint registration with event_notifier enabled | |
1906 | * state. | |
1907 | */ | |
1908 | if (enabled) { | |
1909 | if (!event_notifier->registered) | |
1910 | register_event_notifier(event_notifier); | |
1911 | } else { | |
1912 | if (event_notifier->registered) | |
1913 | unregister_event_notifier(event_notifier); | |
1914 | } | |
1915 | ||
1916 | /* Check if has enablers without bytecode enabled */ | |
1917 | cds_list_for_each_entry(enabler_ref, | |
1918 | &event_notifier->enablers_ref_head, node) { | |
1919 | if (enabler_ref->ref->enabled | |
1920 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1921 | has_enablers_without_bytecode = 1; | |
1922 | break; | |
1923 | } | |
1924 | } | |
1925 | event_notifier->has_enablers_without_bytecode = | |
1926 | has_enablers_without_bytecode; | |
1927 | ||
1928 | /* Enable filters */ | |
1929 | cds_list_for_each_entry(runtime, | |
1930 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1931 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 1932 | } |
d37ecb3f FD |
1933 | |
1934 | /* Enable captures. */ | |
1935 | cds_list_for_each_entry(runtime, | |
1936 | &event_notifier->capture_bytecode_runtime_head, node) { | |
1937 | lttng_bytecode_capture_sync_state(runtime); | |
1938 | } | |
d8d2416d FD |
1939 | } |
1940 | __tracepoint_probe_prune_release_queue(); | |
1941 | } | |
1942 | ||
e58095ef MD |
1943 | /* |
1944 | * Apply enablers to session events, adding events to session if need | |
1945 | * be. It is required after each modification applied to an active | |
1946 | * session, and right before session "start". | |
1947 | * "lazy" sync means we only sync if required. | |
1948 | */ | |
1949 | static | |
d871c65b | 1950 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1951 | { |
e58095ef MD |
1952 | /* We can skip if session is not active */ |
1953 | if (!session->active) | |
1954 | return; | |
d871c65b | 1955 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1956 | } |
53569322 MD |
1957 | |
1958 | /* | |
1959 | * Update all sessions with the given app context. | |
1960 | * Called with ust lock held. | |
1961 | * This is invoked when an application context gets loaded/unloaded. It | |
1962 | * ensures the context callbacks are in sync with the application | |
1963 | * context (either app context callbacks, or dummy callbacks). | |
1964 | */ | |
1965 | void lttng_ust_context_set_session_provider(const char *name, | |
1966 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1967 | void (*record)(struct lttng_ctx_field *field, | |
1968 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1969 | struct lttng_channel *chan), | |
1970 | void (*get_value)(struct lttng_ctx_field *field, | |
1971 | struct lttng_ctx_value *value)) | |
1972 | { | |
bdb12629 | 1973 | struct lttng_ust_session_private *session_priv; |
53569322 | 1974 | |
bdb12629 | 1975 | cds_list_for_each_entry(session_priv, &sessions, node) { |
53569322 | 1976 | struct lttng_channel *chan; |
68bb7559 | 1977 | struct lttng_ust_event_private *event_priv; |
53569322 MD |
1978 | int ret; |
1979 | ||
bdb12629 | 1980 | ret = lttng_ust_context_set_provider_rcu(&session_priv->ctx, |
53569322 MD |
1981 | name, get_size, record, get_value); |
1982 | if (ret) | |
1983 | abort(); | |
bdb12629 | 1984 | cds_list_for_each_entry(chan, &session_priv->chan_head, node) { |
53569322 MD |
1985 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, |
1986 | name, get_size, record, get_value); | |
1987 | if (ret) | |
1988 | abort(); | |
1989 | } | |
bdb12629 | 1990 | cds_list_for_each_entry(event_priv, &session_priv->events_head, node) { |
68bb7559 | 1991 | ret = lttng_ust_context_set_provider_rcu(&event_priv->pub->ctx, |
53569322 MD |
1992 | name, get_size, record, get_value); |
1993 | if (ret) | |
1994 | abort(); | |
1995 | } | |
1996 | } | |
1997 | } | |
d8d2416d FD |
1998 | |
1999 | /* | |
2000 | * Update all event_notifier groups with the given app context. | |
2001 | * Called with ust lock held. | |
2002 | * This is invoked when an application context gets loaded/unloaded. It | |
2003 | * ensures the context callbacks are in sync with the application | |
2004 | * context (either app context callbacks, or dummy callbacks). | |
2005 | */ | |
2006 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
2007 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
2008 | void (*record)(struct lttng_ctx_field *field, | |
2009 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
2010 | struct lttng_channel *chan), | |
2011 | void (*get_value)(struct lttng_ctx_field *field, | |
2012 | struct lttng_ctx_value *value)) | |
2013 | { | |
2014 | struct lttng_event_notifier_group *event_notifier_group; | |
2015 | ||
2016 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2017 | int ret; | |
2018 | ||
2019 | ret = lttng_ust_context_set_provider_rcu( | |
2020 | &event_notifier_group->ctx, | |
2021 | name, get_size, record, get_value); | |
2022 | if (ret) | |
2023 | abort(); | |
2024 | } | |
2025 | } |