Commit | Line | Data |
---|---|---|
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; | |
bd640d74 | 141 | session->struct_size = sizeof(struct lttng_session); |
bdb12629 MD |
142 | session_priv = zmalloc(sizeof(struct lttng_ust_session_private)); |
143 | if (!session_priv) { | |
53569322 MD |
144 | free(session); |
145 | return NULL; | |
146 | } | |
bdb12629 MD |
147 | session->priv = session_priv; |
148 | session_priv->pub = session; | |
149 | if (lttng_context_init_all(&session->priv->ctx)) { | |
150 | free(session_priv); | |
151 | free(session); | |
152 | return NULL; | |
153 | } | |
154 | CDS_INIT_LIST_HEAD(&session->priv->chan_head); | |
155 | CDS_INIT_LIST_HEAD(&session->priv->events_head); | |
156 | CDS_INIT_LIST_HEAD(&session->priv->enums_head); | |
157 | CDS_INIT_LIST_HEAD(&session->priv->enablers_head); | |
d56fa719 | 158 | for (i = 0; i < LTTNG_UST_EVENT_HT_SIZE; i++) |
bdb12629 | 159 | CDS_INIT_HLIST_HEAD(&session->priv->events_ht.table[i]); |
c785c634 | 160 | for (i = 0; i < LTTNG_UST_ENUM_HT_SIZE; i++) |
bdb12629 MD |
161 | CDS_INIT_HLIST_HEAD(&session->priv->enums_ht.table[i]); |
162 | cds_list_add(&session->priv->node, &sessions); | |
8020ceb5 MD |
163 | return session; |
164 | } | |
165 | ||
ebabbf58 MD |
166 | struct lttng_counter *lttng_ust_counter_create( |
167 | const char *counter_transport_name, | |
168 | size_t number_dimensions, const struct lttng_counter_dimension *dimensions) | |
169 | { | |
170 | struct lttng_counter_transport *counter_transport = NULL; | |
171 | struct lttng_counter *counter = NULL; | |
172 | ||
173 | counter_transport = lttng_counter_transport_find(counter_transport_name); | |
174 | if (!counter_transport) | |
175 | goto notransport; | |
176 | counter = zmalloc(sizeof(struct lttng_counter)); | |
177 | if (!counter) | |
178 | goto nomem; | |
179 | ||
180 | counter->ops = &counter_transport->ops; | |
181 | counter->transport = counter_transport; | |
182 | ||
183 | counter->counter = counter->ops->counter_create( | |
184 | number_dimensions, dimensions, 0, | |
185 | -1, 0, NULL, false); | |
186 | if (!counter->counter) { | |
187 | goto create_error; | |
188 | } | |
189 | ||
190 | return counter; | |
191 | ||
192 | create_error: | |
193 | free(counter); | |
194 | nomem: | |
195 | notransport: | |
196 | return NULL; | |
197 | } | |
198 | ||
199 | static | |
200 | void lttng_ust_counter_destroy(struct lttng_counter *counter) | |
201 | { | |
202 | counter->ops->counter_destroy(counter->counter); | |
203 | free(counter); | |
204 | } | |
205 | ||
d8d2416d FD |
206 | struct lttng_event_notifier_group *lttng_event_notifier_group_create(void) |
207 | { | |
208 | struct lttng_event_notifier_group *event_notifier_group; | |
209 | int i; | |
210 | ||
211 | event_notifier_group = zmalloc(sizeof(struct lttng_event_notifier_group)); | |
212 | if (!event_notifier_group) | |
213 | return NULL; | |
214 | ||
51f804ec FD |
215 | /* Add all contexts. */ |
216 | if (lttng_context_init_all(&event_notifier_group->ctx)) { | |
217 | free(event_notifier_group); | |
218 | return NULL; | |
219 | } | |
220 | ||
d8d2416d FD |
221 | CDS_INIT_LIST_HEAD(&event_notifier_group->enablers_head); |
222 | CDS_INIT_LIST_HEAD(&event_notifier_group->event_notifiers_head); | |
223 | for (i = 0; i < LTTNG_UST_EVENT_NOTIFIER_HT_SIZE; i++) | |
224 | CDS_INIT_HLIST_HEAD(&event_notifier_group->event_notifiers_ht.table[i]); | |
225 | ||
226 | cds_list_add(&event_notifier_group->node, &event_notifier_groups); | |
227 | ||
228 | return event_notifier_group; | |
229 | } | |
230 | ||
74d81a6c MD |
231 | /* |
232 | * Only used internally at session destruction. | |
233 | */ | |
234 | static | |
235 | void _lttng_channel_unmap(struct lttng_channel *lttng_chan) | |
236 | { | |
237 | struct channel *chan; | |
238 | struct lttng_ust_shm_handle *handle; | |
239 | ||
240 | cds_list_del(<tng_chan->node); | |
241 | lttng_destroy_context(lttng_chan->ctx); | |
242 | chan = lttng_chan->chan; | |
243 | handle = lttng_chan->handle; | |
244 | /* | |
245 | * note: lttng_chan is private data contained within handle. It | |
246 | * will be freed along with the handle. | |
247 | */ | |
248 | channel_destroy(chan, handle, 0); | |
249 | } | |
250 | ||
ac6b4ac6 MD |
251 | static |
252 | void register_event(struct lttng_event *event) | |
253 | { | |
254 | int ret; | |
255 | const struct lttng_event_desc *desc; | |
256 | ||
68bb7559 MD |
257 | assert(event->priv->registered == 0); |
258 | desc = event->priv->desc; | |
baa1e0bc | 259 | ret = __tracepoint_probe_register_queue_release(desc->name, |
ac6b4ac6 MD |
260 | desc->probe_callback, |
261 | event, desc->signature); | |
262 | WARN_ON_ONCE(ret); | |
263 | if (!ret) | |
68bb7559 | 264 | event->priv->registered = 1; |
ac6b4ac6 MD |
265 | } |
266 | ||
d8d2416d FD |
267 | static |
268 | void register_event_notifier(struct lttng_event_notifier *event_notifier) | |
269 | { | |
270 | int ret; | |
271 | const struct lttng_event_desc *desc; | |
272 | ||
273 | assert(event_notifier->registered == 0); | |
274 | desc = event_notifier->desc; | |
275 | ret = __tracepoint_probe_register_queue_release(desc->name, | |
276 | desc->u.ext.event_notifier_callback, event_notifier, desc->signature); | |
277 | WARN_ON_ONCE(ret); | |
278 | if (!ret) | |
279 | event_notifier->registered = 1; | |
280 | } | |
281 | ||
ac6b4ac6 MD |
282 | static |
283 | void unregister_event(struct lttng_event *event) | |
284 | { | |
285 | int ret; | |
286 | const struct lttng_event_desc *desc; | |
287 | ||
68bb7559 MD |
288 | assert(event->priv->registered == 1); |
289 | desc = event->priv->desc; | |
baa1e0bc | 290 | ret = __tracepoint_probe_unregister_queue_release(desc->name, |
ac6b4ac6 MD |
291 | desc->probe_callback, |
292 | event); | |
293 | WARN_ON_ONCE(ret); | |
294 | if (!ret) | |
68bb7559 | 295 | event->priv->registered = 0; |
ac6b4ac6 MD |
296 | } |
297 | ||
d8d2416d FD |
298 | static |
299 | void unregister_event_notifier(struct lttng_event_notifier *event_notifier) | |
300 | { | |
301 | int ret; | |
302 | const struct lttng_event_desc *desc; | |
303 | ||
304 | assert(event_notifier->registered == 1); | |
305 | desc = event_notifier->desc; | |
306 | ret = __tracepoint_probe_unregister_queue_release(desc->name, | |
307 | desc->u.ext.event_notifier_callback, event_notifier); | |
308 | WARN_ON_ONCE(ret); | |
309 | if (!ret) | |
310 | event_notifier->registered = 0; | |
311 | } | |
312 | ||
ac6b4ac6 MD |
313 | /* |
314 | * Only used internally at session destruction. | |
315 | */ | |
316 | static | |
317 | void _lttng_event_unregister(struct lttng_event *event) | |
318 | { | |
68bb7559 | 319 | if (event->priv->registered) |
ac6b4ac6 MD |
320 | unregister_event(event); |
321 | } | |
322 | ||
d8d2416d FD |
323 | /* |
324 | * Only used internally at session destruction. | |
325 | */ | |
326 | static | |
327 | void _lttng_event_notifier_unregister(struct lttng_event_notifier *event_notifier) | |
328 | { | |
329 | if (event_notifier->registered) | |
330 | unregister_event_notifier(event_notifier); | |
331 | } | |
332 | ||
7dd08bec | 333 | void lttng_session_destroy(struct lttng_session *session) |
8020ceb5 | 334 | { |
7dd08bec | 335 | struct lttng_channel *chan, *tmpchan; |
68bb7559 | 336 | struct lttng_ust_event_private *event_priv, *tmpevent_priv; |
c785c634 | 337 | struct lttng_enum *_enum, *tmp_enum; |
d871c65b | 338 | struct lttng_event_enabler *event_enabler, *event_tmpenabler; |
8020ceb5 | 339 | |
b5234c06 | 340 | CMM_ACCESS_ONCE(session->active) = 0; |
bdb12629 | 341 | cds_list_for_each_entry(event_priv, &session->priv->events_head, node) { |
68bb7559 | 342 | _lttng_event_unregister(event_priv->pub); |
8020ceb5 | 343 | } |
b653ddc1 | 344 | lttng_ust_urcu_synchronize_rcu(); /* Wait for in-flight events to complete */ |
baa1e0bc | 345 | __tracepoint_probe_prune_release_queue(); |
d871c65b | 346 | cds_list_for_each_entry_safe(event_enabler, event_tmpenabler, |
bdb12629 | 347 | &session->priv->enablers_head, node) |
d871c65b | 348 | lttng_event_enabler_destroy(event_enabler); |
68bb7559 | 349 | cds_list_for_each_entry_safe(event_priv, tmpevent_priv, |
bdb12629 | 350 | &session->priv->events_head, node) |
68bb7559 | 351 | _lttng_event_destroy(event_priv->pub); |
c785c634 | 352 | cds_list_for_each_entry_safe(_enum, tmp_enum, |
bdb12629 | 353 | &session->priv->enums_head, node) |
c785c634 | 354 | _lttng_enum_destroy(_enum); |
bdb12629 | 355 | cds_list_for_each_entry_safe(chan, tmpchan, &session->priv->chan_head, node) |
74d81a6c | 356 | _lttng_channel_unmap(chan); |
bdb12629 MD |
357 | cds_list_del(&session->priv->node); |
358 | lttng_destroy_context(session->priv->ctx); | |
359 | free(session->priv); | |
b5234c06 | 360 | free(session); |
8020ceb5 MD |
361 | } |
362 | ||
d8d2416d FD |
363 | void lttng_event_notifier_group_destroy( |
364 | struct lttng_event_notifier_group *event_notifier_group) | |
365 | { | |
366 | int close_ret; | |
367 | struct lttng_event_notifier_enabler *notifier_enabler, *tmpnotifier_enabler; | |
368 | struct lttng_event_notifier *notifier, *tmpnotifier; | |
369 | ||
370 | if (!event_notifier_group) { | |
371 | return; | |
372 | } | |
373 | ||
374 | cds_list_for_each_entry(notifier, | |
375 | &event_notifier_group->event_notifiers_head, node) | |
376 | _lttng_event_notifier_unregister(notifier); | |
377 | ||
b653ddc1 | 378 | lttng_ust_urcu_synchronize_rcu(); |
d8d2416d FD |
379 | |
380 | cds_list_for_each_entry_safe(notifier_enabler, tmpnotifier_enabler, | |
381 | &event_notifier_group->enablers_head, node) | |
382 | lttng_event_notifier_enabler_destroy(notifier_enabler); | |
383 | ||
384 | cds_list_for_each_entry_safe(notifier, tmpnotifier, | |
385 | &event_notifier_group->event_notifiers_head, node) | |
386 | _lttng_event_notifier_destroy(notifier); | |
387 | ||
ebabbf58 MD |
388 | if (event_notifier_group->error_counter) |
389 | lttng_ust_counter_destroy(event_notifier_group->error_counter); | |
390 | ||
391 | /* Close the notification fd to the listener of event_notifiers. */ | |
d8d2416d FD |
392 | |
393 | lttng_ust_lock_fd_tracker(); | |
394 | close_ret = close(event_notifier_group->notification_fd); | |
395 | if (!close_ret) { | |
396 | lttng_ust_delete_fd_from_tracker( | |
397 | event_notifier_group->notification_fd); | |
398 | } else { | |
399 | PERROR("close"); | |
400 | abort(); | |
401 | } | |
402 | lttng_ust_unlock_fd_tracker(); | |
403 | ||
404 | cds_list_del(&event_notifier_group->node); | |
405 | ||
406 | free(event_notifier_group); | |
407 | } | |
408 | ||
d871c65b FD |
409 | static |
410 | void lttng_enabler_destroy(struct lttng_enabler *enabler) | |
411 | { | |
ab249ecf | 412 | struct lttng_ust_bytecode_node *filter_node, *tmp_filter_node; |
d871c65b FD |
413 | struct lttng_ust_excluder_node *excluder_node, *tmp_excluder_node; |
414 | ||
415 | if (!enabler) { | |
416 | return; | |
417 | } | |
418 | ||
419 | /* Destroy filter bytecode */ | |
420 | cds_list_for_each_entry_safe(filter_node, tmp_filter_node, | |
421 | &enabler->filter_bytecode_head, node) { | |
422 | free(filter_node); | |
423 | } | |
424 | ||
425 | /* Destroy excluders */ | |
426 | cds_list_for_each_entry_safe(excluder_node, tmp_excluder_node, | |
427 | &enabler->excluder_head, node) { | |
428 | free(excluder_node); | |
429 | } | |
430 | } | |
431 | ||
d8d2416d FD |
432 | void lttng_event_notifier_enabler_destroy(struct lttng_event_notifier_enabler *event_notifier_enabler) |
433 | { | |
434 | if (!event_notifier_enabler) { | |
435 | return; | |
436 | } | |
437 | ||
438 | cds_list_del(&event_notifier_enabler->node); | |
439 | ||
440 | lttng_enabler_destroy(lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
441 | ||
442 | free(event_notifier_enabler); | |
443 | } | |
444 | ||
53569322 MD |
445 | static |
446 | int lttng_enum_create(const struct lttng_enum_desc *desc, | |
447 | struct lttng_session *session) | |
448 | { | |
449 | const char *enum_name = desc->name; | |
450 | struct lttng_enum *_enum; | |
451 | struct cds_hlist_head *head; | |
53569322 MD |
452 | int ret = 0; |
453 | size_t name_len = strlen(enum_name); | |
454 | uint32_t hash; | |
455 | int notify_socket; | |
456 | ||
b33b46f7 | 457 | /* Check if this enum is already registered for this session. */ |
53569322 | 458 | hash = jhash(enum_name, name_len, 0); |
bdb12629 | 459 | head = &session->priv->enums_ht.table[hash & (LTTNG_UST_ENUM_HT_SIZE - 1)]; |
b33b46f7 FD |
460 | |
461 | _enum = lttng_ust_enum_get_from_desc(session, desc); | |
462 | if (_enum) { | |
463 | ret = -EEXIST; | |
464 | goto exist; | |
53569322 MD |
465 | } |
466 | ||
bdb12629 | 467 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
53569322 MD |
468 | if (notify_socket < 0) { |
469 | ret = notify_socket; | |
470 | goto socket_error; | |
471 | } | |
472 | ||
473 | _enum = zmalloc(sizeof(*_enum)); | |
474 | if (!_enum) { | |
475 | ret = -ENOMEM; | |
476 | goto cache_error; | |
477 | } | |
478 | _enum->session = session; | |
479 | _enum->desc = desc; | |
480 | ||
481 | ret = ustcomm_register_enum(notify_socket, | |
bdb12629 | 482 | session->priv->objd, |
53569322 MD |
483 | enum_name, |
484 | desc->nr_entries, | |
485 | desc->entries, | |
486 | &_enum->id); | |
487 | if (ret < 0) { | |
488 | DBG("Error (%d) registering enumeration to sessiond", ret); | |
489 | goto sessiond_register_error; | |
490 | } | |
bdb12629 | 491 | cds_list_add(&_enum->node, &session->priv->enums_head); |
53569322 MD |
492 | cds_hlist_add_head(&_enum->hlist, head); |
493 | return 0; | |
494 | ||
495 | sessiond_register_error: | |
496 | free(_enum); | |
497 | cache_error: | |
498 | socket_error: | |
499 | exist: | |
500 | return ret; | |
501 | } | |
502 | ||
503 | static | |
504 | int lttng_create_enum_check(const struct lttng_type *type, | |
505 | struct lttng_session *session) | |
506 | { | |
507 | switch (type->atype) { | |
508 | case atype_enum: | |
509 | { | |
510 | const struct lttng_enum_desc *enum_desc; | |
511 | int ret; | |
512 | ||
218deb69 MD |
513 | enum_desc = type->u.legacy.basic.enumeration.desc; |
514 | ret = lttng_enum_create(enum_desc, session); | |
515 | if (ret && ret != -EEXIST) { | |
516 | DBG("Unable to create enum error: (%d)", ret); | |
517 | return ret; | |
518 | } | |
519 | break; | |
520 | } | |
521 | case atype_enum_nestable: | |
522 | { | |
523 | const struct lttng_enum_desc *enum_desc; | |
524 | int ret; | |
525 | ||
526 | enum_desc = type->u.enum_nestable.desc; | |
53569322 MD |
527 | ret = lttng_enum_create(enum_desc, session); |
528 | if (ret && ret != -EEXIST) { | |
529 | DBG("Unable to create enum error: (%d)", ret); | |
530 | return ret; | |
531 | } | |
532 | break; | |
533 | } | |
534 | case atype_dynamic: | |
535 | { | |
536 | const struct lttng_event_field *tag_field_generic; | |
537 | const struct lttng_enum_desc *enum_desc; | |
538 | int ret; | |
539 | ||
540 | tag_field_generic = lttng_ust_dynamic_type_tag_field(); | |
218deb69 | 541 | enum_desc = tag_field_generic->type.u.enum_nestable.desc; |
53569322 MD |
542 | ret = lttng_enum_create(enum_desc, session); |
543 | if (ret && ret != -EEXIST) { | |
544 | DBG("Unable to create enum error: (%d)", ret); | |
545 | return ret; | |
546 | } | |
547 | break; | |
548 | } | |
549 | default: | |
550 | /* TODO: nested types when they become supported. */ | |
551 | break; | |
552 | } | |
553 | return 0; | |
554 | } | |
555 | ||
556 | static | |
557 | int lttng_create_all_event_enums(size_t nr_fields, | |
558 | const struct lttng_event_field *event_fields, | |
559 | struct lttng_session *session) | |
560 | { | |
561 | size_t i; | |
562 | int ret; | |
563 | ||
564 | /* For each field, ensure enum is part of the session. */ | |
565 | for (i = 0; i < nr_fields; i++) { | |
566 | const struct lttng_type *type = &event_fields[i].type; | |
567 | ||
568 | ret = lttng_create_enum_check(type, session); | |
569 | if (ret) | |
570 | return ret; | |
571 | } | |
572 | return 0; | |
573 | } | |
574 | ||
575 | static | |
576 | int lttng_create_all_ctx_enums(size_t nr_fields, | |
577 | const struct lttng_ctx_field *ctx_fields, | |
578 | struct lttng_session *session) | |
579 | { | |
580 | size_t i; | |
581 | int ret; | |
582 | ||
583 | /* For each field, ensure enum is part of the session. */ | |
584 | for (i = 0; i < nr_fields; i++) { | |
585 | const struct lttng_type *type = &ctx_fields[i].event_field.type; | |
586 | ||
587 | ret = lttng_create_enum_check(type, session); | |
588 | if (ret) | |
589 | return ret; | |
590 | } | |
591 | return 0; | |
592 | } | |
593 | ||
710b8ee3 MD |
594 | /* |
595 | * Ensure that a state-dump will be performed for this session at the end | |
596 | * of the current handle_message(). | |
597 | */ | |
598 | int lttng_session_statedump(struct lttng_session *session) | |
599 | { | |
bdb12629 MD |
600 | session->priv->statedump_pending = 1; |
601 | lttng_ust_sockinfo_session_enabled(session->priv->owner); | |
710b8ee3 MD |
602 | return 0; |
603 | } | |
53569322 | 604 | |
7dd08bec | 605 | int lttng_session_enable(struct lttng_session *session) |
8020ceb5 MD |
606 | { |
607 | int ret = 0; | |
7dd08bec | 608 | struct lttng_channel *chan; |
32ce8569 | 609 | int notify_socket; |
8020ceb5 | 610 | |
8020ceb5 MD |
611 | if (session->active) { |
612 | ret = -EBUSY; | |
613 | goto end; | |
614 | } | |
615 | ||
bdb12629 | 616 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
32ce8569 MD |
617 | if (notify_socket < 0) |
618 | return notify_socket; | |
619 | ||
ac6b4ac6 | 620 | /* Set transient enabler state to "enabled" */ |
bdb12629 | 621 | session->priv->tstate = 1; |
e58095ef | 622 | |
3ff7660f | 623 | /* We need to sync enablers with session before activation. */ |
d871c65b | 624 | lttng_session_sync_event_enablers(session); |
3ff7660f | 625 | |
8020ceb5 MD |
626 | /* |
627 | * Snapshot the number of events per channel to know the type of header | |
628 | * we need to use. | |
629 | */ | |
bdb12629 | 630 | cds_list_for_each_entry(chan, &session->priv->chan_head, node) { |
32ce8569 | 631 | const struct lttng_ctx *ctx; |
83e43212 | 632 | const struct lttng_ctx_field *fields = NULL; |
32ce8569 | 633 | size_t nr_fields = 0; |
6ca18e66 | 634 | uint32_t chan_id; |
32ce8569 MD |
635 | |
636 | /* don't change it if session stop/restart */ | |
8020ceb5 | 637 | if (chan->header_type) |
32ce8569 MD |
638 | continue; |
639 | ctx = chan->ctx; | |
640 | if (ctx) { | |
641 | nr_fields = ctx->nr_fields; | |
83e43212 | 642 | fields = ctx->fields; |
53569322 MD |
643 | ret = lttng_create_all_ctx_enums(nr_fields, fields, |
644 | session); | |
645 | if (ret < 0) { | |
646 | DBG("Error (%d) adding enum to session", ret); | |
647 | return ret; | |
648 | } | |
32ce8569 MD |
649 | } |
650 | ret = ustcomm_register_channel(notify_socket, | |
53569322 | 651 | session, |
bdb12629 | 652 | session->priv->objd, |
32ce8569 MD |
653 | chan->objd, |
654 | nr_fields, | |
655 | fields, | |
6ca18e66 | 656 | &chan_id, |
32ce8569 | 657 | &chan->header_type); |
b869b5ae MD |
658 | if (ret) { |
659 | DBG("Error (%d) registering channel to sessiond", ret); | |
32ce8569 | 660 | return ret; |
b869b5ae | 661 | } |
6ca18e66 MD |
662 | if (chan_id != chan->id) { |
663 | DBG("Error: channel registration id (%u) does not match id assigned at creation (%u)", | |
664 | chan_id, chan->id); | |
665 | return -EINVAL; | |
666 | } | |
8020ceb5 MD |
667 | } |
668 | ||
ac6b4ac6 | 669 | /* Set atomically the state to "active" */ |
b5234c06 | 670 | CMM_ACCESS_ONCE(session->active) = 1; |
bdb12629 | 671 | CMM_ACCESS_ONCE(session->priv->been_active) = 1; |
95c25348 | 672 | |
710b8ee3 MD |
673 | ret = lttng_session_statedump(session); |
674 | if (ret) | |
675 | return ret; | |
8020ceb5 | 676 | end: |
8020ceb5 MD |
677 | return ret; |
678 | } | |
679 | ||
7dd08bec | 680 | int lttng_session_disable(struct lttng_session *session) |
8020ceb5 MD |
681 | { |
682 | int ret = 0; | |
683 | ||
8020ceb5 MD |
684 | if (!session->active) { |
685 | ret = -EBUSY; | |
686 | goto end; | |
687 | } | |
ac6b4ac6 | 688 | /* Set atomically the state to "inactive" */ |
b5234c06 | 689 | CMM_ACCESS_ONCE(session->active) = 0; |
ac6b4ac6 MD |
690 | |
691 | /* Set transient enabler state to "disabled" */ | |
bdb12629 | 692 | session->priv->tstate = 0; |
d871c65b | 693 | lttng_session_sync_event_enablers(session); |
8020ceb5 | 694 | end: |
8020ceb5 MD |
695 | return ret; |
696 | } | |
697 | ||
7dd08bec | 698 | int lttng_channel_enable(struct lttng_channel *channel) |
976fe9ea | 699 | { |
ac6b4ac6 | 700 | int ret = 0; |
976fe9ea | 701 | |
ac6b4ac6 MD |
702 | if (channel->enabled) { |
703 | ret = -EBUSY; | |
704 | goto end; | |
705 | } | |
706 | /* Set transient enabler state to "enabled" */ | |
707 | channel->tstate = 1; | |
d871c65b | 708 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
709 | /* Set atomically the state to "enabled" */ |
710 | CMM_ACCESS_ONCE(channel->enabled) = 1; | |
711 | end: | |
712 | return ret; | |
976fe9ea MD |
713 | } |
714 | ||
7dd08bec | 715 | int lttng_channel_disable(struct lttng_channel *channel) |
976fe9ea | 716 | { |
ac6b4ac6 | 717 | int ret = 0; |
976fe9ea | 718 | |
ac6b4ac6 MD |
719 | if (!channel->enabled) { |
720 | ret = -EBUSY; | |
721 | goto end; | |
722 | } | |
723 | /* Set atomically the state to "disabled" */ | |
724 | CMM_ACCESS_ONCE(channel->enabled) = 0; | |
725 | /* Set transient enabler state to "enabled" */ | |
726 | channel->tstate = 0; | |
d871c65b | 727 | lttng_session_sync_event_enablers(channel->session); |
ac6b4ac6 MD |
728 | end: |
729 | return ret; | |
976fe9ea MD |
730 | } |
731 | ||
fb470188 FD |
732 | static inline |
733 | struct cds_hlist_head *borrow_hash_table_bucket( | |
734 | struct cds_hlist_head *hash_table, | |
735 | unsigned int hash_table_size, | |
736 | const struct lttng_event_desc *desc) | |
737 | { | |
738 | const char *event_name; | |
739 | size_t name_len; | |
740 | uint32_t hash; | |
741 | ||
742 | event_name = desc->name; | |
743 | name_len = strlen(event_name); | |
744 | ||
745 | hash = jhash(event_name, name_len, 0); | |
746 | return &hash_table[hash & (hash_table_size - 1)]; | |
747 | } | |
748 | ||
8020ceb5 MD |
749 | /* |
750 | * Supports event creation while tracing session is active. | |
751 | */ | |
e58095ef MD |
752 | static |
753 | int lttng_event_create(const struct lttng_event_desc *desc, | |
754 | struct lttng_channel *chan) | |
8020ceb5 | 755 | { |
7dd08bec | 756 | struct lttng_event *event; |
68bb7559 | 757 | struct lttng_ust_event_private *event_priv; |
32ce8569 | 758 | struct lttng_session *session = chan->session; |
d56fa719 | 759 | struct cds_hlist_head *head; |
576599a0 | 760 | int ret = 0; |
32ce8569 MD |
761 | int notify_socket, loglevel; |
762 | const char *uri; | |
8020ceb5 | 763 | |
bdb12629 | 764 | head = borrow_hash_table_bucket(chan->session->priv->events_ht.table, |
fb470188 | 765 | LTTNG_UST_EVENT_HT_SIZE, desc); |
457a6b58 | 766 | |
bdb12629 | 767 | notify_socket = lttng_get_notify_socket(session->priv->owner); |
32ce8569 MD |
768 | if (notify_socket < 0) { |
769 | ret = notify_socket; | |
770 | goto socket_error; | |
771 | } | |
772 | ||
53569322 MD |
773 | ret = lttng_create_all_event_enums(desc->nr_fields, desc->fields, |
774 | session); | |
c785c634 MD |
775 | if (ret < 0) { |
776 | DBG("Error (%d) adding enum to session", ret); | |
777 | goto create_enum_error; | |
778 | } | |
779 | ||
457a6b58 MD |
780 | /* |
781 | * Check if loglevel match. Refuse to connect event if not. | |
782 | */ | |
7dd08bec | 783 | event = zmalloc(sizeof(struct lttng_event)); |
576599a0 MD |
784 | if (!event) { |
785 | ret = -ENOMEM; | |
8020ceb5 | 786 | goto cache_error; |
576599a0 | 787 | } |
74579d3b | 788 | event->struct_size = sizeof(struct lttng_event); |
68bb7559 MD |
789 | event_priv = zmalloc(sizeof(struct lttng_ust_event_private)); |
790 | if (!event_priv) { | |
791 | ret = -ENOMEM; | |
792 | goto priv_error; | |
793 | } | |
794 | event->priv = event_priv; | |
795 | event_priv->pub = event; | |
8020ceb5 | 796 | event->chan = chan; |
e58095ef | 797 | |
ac6b4ac6 MD |
798 | /* Event will be enabled by enabler sync. */ |
799 | event->enabled = 0; | |
68bb7559 | 800 | event->priv->registered = 0; |
a56fd376 | 801 | CDS_INIT_LIST_HEAD(&event->filter_bytecode_runtime_head); |
68bb7559 MD |
802 | CDS_INIT_LIST_HEAD(&event->priv->enablers_ref_head); |
803 | event->priv->desc = desc; | |
32ce8569 MD |
804 | |
805 | if (desc->loglevel) | |
68bb7559 | 806 | loglevel = *(*event->priv->desc->loglevel); |
32ce8569 MD |
807 | else |
808 | loglevel = TRACE_DEFAULT; | |
809 | if (desc->u.ext.model_emf_uri) | |
810 | uri = *(desc->u.ext.model_emf_uri); | |
811 | else | |
812 | uri = NULL; | |
813 | ||
13b21cd6 MD |
814 | /* Fetch event ID from sessiond */ |
815 | ret = ustcomm_register_event(notify_socket, | |
c785c634 | 816 | session, |
bdb12629 | 817 | session->priv->objd, |
13b21cd6 | 818 | chan->objd, |
fb470188 | 819 | desc->name, |
13b21cd6 MD |
820 | loglevel, |
821 | desc->signature, | |
822 | desc->nr_fields, | |
823 | desc->fields, | |
824 | uri, | |
825 | &event->id); | |
826 | if (ret < 0) { | |
827 | DBG("Error (%d) registering event to sessiond", ret); | |
828 | goto sessiond_register_error; | |
32ce8569 | 829 | } |
2b213b16 | 830 | |
bdb12629 | 831 | cds_list_add(&event->priv->node, &chan->session->priv->events_head); |
68bb7559 | 832 | cds_hlist_add_head(&event->priv->hlist, head); |
576599a0 | 833 | return 0; |
8020ceb5 | 834 | |
32ce8569 | 835 | sessiond_register_error: |
68bb7559 MD |
836 | free(event_priv); |
837 | priv_error: | |
b5234c06 | 838 | free(event); |
8020ceb5 | 839 | cache_error: |
c785c634 | 840 | create_enum_error: |
32ce8569 | 841 | socket_error: |
576599a0 | 842 | return ret; |
8020ceb5 MD |
843 | } |
844 | ||
d8d2416d FD |
845 | static |
846 | int lttng_event_notifier_create(const struct lttng_event_desc *desc, | |
6566528b | 847 | uint64_t token, uint64_t error_counter_index, |
d8d2416d FD |
848 | struct lttng_event_notifier_group *event_notifier_group) |
849 | { | |
850 | struct lttng_event_notifier *event_notifier; | |
851 | struct cds_hlist_head *head; | |
852 | int ret = 0; | |
853 | ||
854 | /* | |
855 | * Get the hashtable bucket the created lttng_event_notifier object | |
856 | * should be inserted. | |
857 | */ | |
858 | head = borrow_hash_table_bucket( | |
859 | event_notifier_group->event_notifiers_ht.table, | |
860 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
861 | ||
862 | event_notifier = zmalloc(sizeof(struct lttng_event_notifier)); | |
863 | if (!event_notifier) { | |
864 | ret = -ENOMEM; | |
865 | goto error; | |
866 | } | |
867 | ||
868 | event_notifier->group = event_notifier_group; | |
869 | event_notifier->user_token = token; | |
6566528b | 870 | event_notifier->error_counter_index = error_counter_index; |
d8d2416d FD |
871 | |
872 | /* Event notifier will be enabled by enabler sync. */ | |
873 | event_notifier->enabled = 0; | |
874 | event_notifier->registered = 0; | |
875 | ||
876 | CDS_INIT_LIST_HEAD(&event_notifier->filter_bytecode_runtime_head); | |
d37ecb3f | 877 | CDS_INIT_LIST_HEAD(&event_notifier->capture_bytecode_runtime_head); |
d8d2416d FD |
878 | CDS_INIT_LIST_HEAD(&event_notifier->enablers_ref_head); |
879 | event_notifier->desc = desc; | |
cab88ff8 | 880 | event_notifier->notification_send = lttng_event_notifier_notification_send; |
d8d2416d FD |
881 | |
882 | cds_list_add(&event_notifier->node, | |
883 | &event_notifier_group->event_notifiers_head); | |
884 | cds_hlist_add_head(&event_notifier->hlist, head); | |
885 | ||
886 | return 0; | |
887 | ||
888 | error: | |
889 | return ret; | |
890 | } | |
891 | ||
892 | static | |
893 | void _lttng_event_notifier_destroy(struct lttng_event_notifier *event_notifier) | |
894 | { | |
895 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
896 | ||
897 | /* Remove from event_notifier list. */ | |
898 | cds_list_del(&event_notifier->node); | |
899 | /* Remove from event_notifier hash table. */ | |
900 | cds_hlist_del(&event_notifier->hlist); | |
901 | ||
902 | lttng_free_event_notifier_filter_runtime(event_notifier); | |
903 | ||
904 | /* Free event_notifier enabler refs */ | |
905 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
906 | &event_notifier->enablers_ref_head, node) | |
907 | free(enabler_ref); | |
908 | free(event_notifier); | |
909 | } | |
910 | ||
e58095ef | 911 | static |
196ec2df | 912 | int lttng_desc_match_star_glob_enabler(const struct lttng_event_desc *desc, |
e58095ef MD |
913 | struct lttng_enabler *enabler) |
914 | { | |
915 | int loglevel = 0; | |
7e2e405c | 916 | unsigned int has_loglevel = 0; |
e58095ef | 917 | |
e450e339 | 918 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_STAR_GLOB); |
1f6f42e6 MD |
919 | if (!strutils_star_glob_match(enabler->event_param.name, SIZE_MAX, |
920 | desc->name, SIZE_MAX)) | |
e58095ef MD |
921 | return 0; |
922 | if (desc->loglevel) { | |
923 | loglevel = *(*desc->loglevel); | |
924 | has_loglevel = 1; | |
925 | } | |
926 | if (!lttng_loglevel_match(loglevel, | |
927 | has_loglevel, | |
928 | enabler->event_param.loglevel_type, | |
929 | enabler->event_param.loglevel)) | |
930 | return 0; | |
931 | return 1; | |
932 | } | |
933 | ||
934 | static | |
935 | int lttng_desc_match_event_enabler(const struct lttng_event_desc *desc, | |
936 | struct lttng_enabler *enabler) | |
937 | { | |
938 | int loglevel = 0; | |
939 | unsigned int has_loglevel = 0; | |
940 | ||
e450e339 | 941 | assert(enabler->format_type == LTTNG_ENABLER_FORMAT_EVENT); |
e58095ef MD |
942 | if (strcmp(desc->name, enabler->event_param.name)) |
943 | return 0; | |
944 | if (desc->loglevel) { | |
945 | loglevel = *(*desc->loglevel); | |
946 | has_loglevel = 1; | |
947 | } | |
948 | if (!lttng_loglevel_match(loglevel, | |
949 | has_loglevel, | |
950 | enabler->event_param.loglevel_type, | |
951 | enabler->event_param.loglevel)) | |
952 | return 0; | |
953 | return 1; | |
954 | } | |
955 | ||
956 | static | |
957 | int lttng_desc_match_enabler(const struct lttng_event_desc *desc, | |
958 | struct lttng_enabler *enabler) | |
959 | { | |
e450e339 FD |
960 | switch (enabler->format_type) { |
961 | case LTTNG_ENABLER_FORMAT_STAR_GLOB: | |
196ec2df PP |
962 | { |
963 | struct lttng_ust_excluder_node *excluder; | |
964 | ||
965 | if (!lttng_desc_match_star_glob_enabler(desc, enabler)) { | |
966 | return 0; | |
967 | } | |
968 | ||
969 | /* | |
970 | * If the matching event matches with an excluder, | |
971 | * return 'does not match' | |
972 | */ | |
973 | cds_list_for_each_entry(excluder, &enabler->excluder_head, node) { | |
974 | int count; | |
975 | ||
976 | for (count = 0; count < excluder->excluder.count; count++) { | |
977 | int len; | |
978 | char *excluder_name; | |
979 | ||
980 | excluder_name = (char *) (excluder->excluder.names) | |
981 | + count * LTTNG_UST_SYM_NAME_LEN; | |
982 | len = strnlen(excluder_name, LTTNG_UST_SYM_NAME_LEN); | |
1f6f42e6 | 983 | if (len > 0 && strutils_star_glob_match(excluder_name, len, desc->name, SIZE_MAX)) |
196ec2df | 984 | return 0; |
ed5b5bbd JI |
985 | } |
986 | } | |
196ec2df | 987 | return 1; |
ed5b5bbd | 988 | } |
e450e339 | 989 | case LTTNG_ENABLER_FORMAT_EVENT: |
e58095ef MD |
990 | return lttng_desc_match_event_enabler(desc, enabler); |
991 | default: | |
992 | return -EINVAL; | |
993 | } | |
994 | } | |
995 | ||
996 | static | |
d871c65b FD |
997 | int lttng_event_enabler_match_event(struct lttng_event_enabler *event_enabler, |
998 | struct lttng_event *event) | |
e58095ef | 999 | { |
68bb7559 | 1000 | if (lttng_desc_match_enabler(event->priv->desc, |
d871c65b FD |
1001 | lttng_event_enabler_as_enabler(event_enabler)) |
1002 | && event->chan == event_enabler->chan) | |
d970f72e MD |
1003 | return 1; |
1004 | else | |
1005 | return 0; | |
e58095ef MD |
1006 | } |
1007 | ||
d8d2416d FD |
1008 | static |
1009 | int lttng_event_notifier_enabler_match_event_notifier( | |
1010 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
1011 | struct lttng_event_notifier *event_notifier) | |
1012 | { | |
1013 | int desc_matches = lttng_desc_match_enabler(event_notifier->desc, | |
1014 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1015 | ||
1016 | if (desc_matches && event_notifier->group == event_notifier_enabler->group && | |
1017 | event_notifier->user_token == event_notifier_enabler->user_token) | |
1018 | return 1; | |
1019 | else | |
1020 | return 0; | |
1021 | } | |
1022 | ||
e58095ef | 1023 | static |
d871c65b FD |
1024 | struct lttng_enabler_ref *lttng_enabler_ref( |
1025 | struct cds_list_head *enabler_ref_list, | |
e58095ef MD |
1026 | struct lttng_enabler *enabler) |
1027 | { | |
1028 | struct lttng_enabler_ref *enabler_ref; | |
1029 | ||
d871c65b | 1030 | cds_list_for_each_entry(enabler_ref, enabler_ref_list, node) { |
e58095ef MD |
1031 | if (enabler_ref->ref == enabler) |
1032 | return enabler_ref; | |
1033 | } | |
1034 | return NULL; | |
1035 | } | |
1036 | ||
8020ceb5 | 1037 | /* |
e58095ef MD |
1038 | * Create struct lttng_event if it is missing and present in the list of |
1039 | * tracepoint probes. | |
8020ceb5 | 1040 | */ |
e58095ef | 1041 | static |
d871c65b | 1042 | void lttng_create_event_if_missing(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1043 | { |
d871c65b | 1044 | struct lttng_session *session = event_enabler->chan->session; |
e58095ef MD |
1045 | struct lttng_probe_desc *probe_desc; |
1046 | const struct lttng_event_desc *desc; | |
68bb7559 | 1047 | struct lttng_ust_event_private *event_priv; |
e58095ef MD |
1048 | int i; |
1049 | struct cds_list_head *probe_list; | |
1050 | ||
1051 | probe_list = lttng_get_probe_list_head(); | |
1052 | /* | |
1053 | * For each probe event, if we find that a probe event matches | |
1054 | * our enabler, create an associated lttng_event if not | |
1055 | * already present. | |
1056 | */ | |
1057 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1058 | for (i = 0; i < probe_desc->nr_events; i++) { | |
98a97f24 FD |
1059 | int ret; |
1060 | bool found = false; | |
d56fa719 MD |
1061 | struct cds_hlist_head *head; |
1062 | struct cds_hlist_node *node; | |
e58095ef MD |
1063 | |
1064 | desc = probe_desc->event_desc[i]; | |
d871c65b FD |
1065 | if (!lttng_desc_match_enabler(desc, |
1066 | lttng_event_enabler_as_enabler(event_enabler))) | |
e58095ef MD |
1067 | continue; |
1068 | ||
fb470188 | 1069 | head = borrow_hash_table_bucket( |
bdb12629 | 1070 | session->priv->events_ht.table, |
fb470188 FD |
1071 | LTTNG_UST_EVENT_HT_SIZE, desc); |
1072 | ||
68bb7559 MD |
1073 | cds_hlist_for_each_entry(event_priv, node, head, hlist) { |
1074 | if (event_priv->desc == desc | |
1075 | && event_priv->pub->chan == event_enabler->chan) { | |
98a97f24 | 1076 | found = true; |
3140bffe FD |
1077 | break; |
1078 | } | |
e58095ef MD |
1079 | } |
1080 | if (found) | |
1081 | continue; | |
1082 | ||
1083 | /* | |
1084 | * We need to create an event for this | |
1085 | * event probe. | |
1086 | */ | |
1087 | ret = lttng_event_create(probe_desc->event_desc[i], | |
d871c65b | 1088 | event_enabler->chan); |
e58095ef | 1089 | if (ret) { |
32ce8569 MD |
1090 | DBG("Unable to create event %s, error %d\n", |
1091 | probe_desc->event_desc[i]->name, ret); | |
e58095ef | 1092 | } |
8165c8da | 1093 | } |
8020ceb5 | 1094 | } |
8020ceb5 MD |
1095 | } |
1096 | ||
a44d07da FD |
1097 | static |
1098 | void probe_provider_event_for_each(struct lttng_probe_desc *provider_desc, | |
d8d2416d FD |
1099 | void (*event_func)(struct lttng_session *session, |
1100 | struct lttng_event *event), | |
1101 | void (*event_notifier_func)(struct lttng_event_notifier *event_notifier)) | |
35ac38cb FD |
1102 | { |
1103 | struct cds_hlist_node *node, *tmp_node; | |
1104 | struct cds_list_head *sessionsp; | |
a44d07da | 1105 | unsigned int i; |
35ac38cb FD |
1106 | |
1107 | /* Get handle on list of sessions. */ | |
7753d283 | 1108 | sessionsp = lttng_get_sessions(); |
35ac38cb FD |
1109 | |
1110 | /* | |
a44d07da FD |
1111 | * Iterate over all events in the probe provider descriptions and |
1112 | * sessions to queue the unregistration of the events. | |
35ac38cb FD |
1113 | */ |
1114 | for (i = 0; i < provider_desc->nr_events; i++) { | |
1115 | const struct lttng_event_desc *event_desc; | |
d8d2416d FD |
1116 | struct lttng_event_notifier_group *event_notifier_group; |
1117 | struct lttng_event_notifier *event_notifier; | |
bdb12629 | 1118 | struct lttng_ust_session_private *session_priv; |
a44d07da | 1119 | struct cds_hlist_head *head; |
68bb7559 | 1120 | struct lttng_ust_event_private *event_priv; |
35ac38cb FD |
1121 | |
1122 | event_desc = provider_desc->event_desc[i]; | |
35ac38cb | 1123 | |
a44d07da FD |
1124 | /* |
1125 | * Iterate over all session to find the current event | |
1126 | * description. | |
1127 | */ | |
bdb12629 | 1128 | cds_list_for_each_entry(session_priv, sessionsp, node) { |
35ac38cb | 1129 | /* |
a44d07da FD |
1130 | * Get the list of events in the hashtable bucket and |
1131 | * iterate to find the event matching this descriptor. | |
35ac38cb | 1132 | */ |
fb470188 | 1133 | head = borrow_hash_table_bucket( |
bdb12629 | 1134 | session_priv->events_ht.table, |
fb470188 FD |
1135 | LTTNG_UST_EVENT_HT_SIZE, event_desc); |
1136 | ||
68bb7559 MD |
1137 | cds_hlist_for_each_entry_safe(event_priv, node, tmp_node, head, hlist) { |
1138 | if (event_desc == event_priv->desc) { | |
bdb12629 | 1139 | event_func(session_priv->pub, event_priv->pub); |
35ac38cb FD |
1140 | break; |
1141 | } | |
1142 | } | |
1143 | } | |
d8d2416d FD |
1144 | |
1145 | /* | |
1146 | * Iterate over all event_notifier groups to find the current event | |
1147 | * description. | |
1148 | */ | |
1149 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1150 | /* | |
1151 | * Get the list of event_notifiers in the hashtable bucket and | |
1152 | * iterate to find the event_notifier matching this | |
1153 | * descriptor. | |
1154 | */ | |
1155 | head = borrow_hash_table_bucket( | |
1156 | event_notifier_group->event_notifiers_ht.table, | |
1157 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, event_desc); | |
1158 | ||
1159 | cds_hlist_for_each_entry_safe(event_notifier, node, tmp_node, head, hlist) { | |
1160 | if (event_desc == event_notifier->desc) { | |
1161 | event_notifier_func(event_notifier); | |
1162 | break; | |
1163 | } | |
1164 | } | |
1165 | } | |
35ac38cb | 1166 | } |
a44d07da FD |
1167 | } |
1168 | ||
1169 | static | |
1170 | void _unregister_event(struct lttng_session *session, | |
1171 | struct lttng_event *event) | |
1172 | { | |
1173 | _lttng_event_unregister(event); | |
1174 | } | |
1175 | ||
1176 | static | |
1177 | void _event_enum_destroy(struct lttng_session *session, | |
1178 | struct lttng_event *event) | |
1179 | { | |
1180 | unsigned int i; | |
1181 | ||
1182 | /* Destroy enums of the current event. */ | |
68bb7559 | 1183 | for (i = 0; i < event->priv->desc->nr_fields; i++) { |
a44d07da FD |
1184 | const struct lttng_enum_desc *enum_desc; |
1185 | const struct lttng_event_field *field; | |
1186 | struct lttng_enum *curr_enum; | |
1187 | ||
68bb7559 | 1188 | field = &(event->priv->desc->fields[i]); |
a44d07da FD |
1189 | switch (field->type.atype) { |
1190 | case atype_enum: | |
1191 | enum_desc = field->type.u.legacy.basic.enumeration.desc; | |
1192 | break; | |
1193 | case atype_enum_nestable: | |
1194 | enum_desc = field->type.u.enum_nestable.desc; | |
1195 | break; | |
1196 | default: | |
1197 | continue; | |
1198 | } | |
1199 | ||
1200 | curr_enum = lttng_ust_enum_get_from_desc(session, enum_desc); | |
1201 | if (curr_enum) { | |
1202 | _lttng_enum_destroy(curr_enum); | |
1203 | } | |
1204 | } | |
1205 | ||
1206 | /* Destroy event. */ | |
1207 | _lttng_event_destroy(event); | |
1208 | } | |
1209 | ||
1210 | /* | |
1211 | * Iterate over all the UST sessions to unregister and destroy all probes from | |
1212 | * the probe provider descriptor received as argument. Must me called with the | |
1213 | * ust_lock held. | |
1214 | */ | |
1215 | void lttng_probe_provider_unregister_events( | |
1216 | struct lttng_probe_desc *provider_desc) | |
1217 | { | |
1218 | /* | |
1219 | * Iterate over all events in the probe provider descriptions and sessions | |
1220 | * to queue the unregistration of the events. | |
1221 | */ | |
d8d2416d FD |
1222 | probe_provider_event_for_each(provider_desc, _unregister_event, |
1223 | _lttng_event_notifier_unregister); | |
35ac38cb FD |
1224 | |
1225 | /* Wait for grace period. */ | |
b653ddc1 | 1226 | lttng_ust_urcu_synchronize_rcu(); |
35ac38cb FD |
1227 | /* Prune the unregistration queue. */ |
1228 | __tracepoint_probe_prune_release_queue(); | |
1229 | ||
1230 | /* | |
1231 | * It is now safe to destroy the events and remove them from the event list | |
1232 | * and hashtables. | |
1233 | */ | |
d8d2416d FD |
1234 | probe_provider_event_for_each(provider_desc, _event_enum_destroy, |
1235 | _lttng_event_notifier_destroy); | |
35ac38cb FD |
1236 | } |
1237 | ||
8020ceb5 | 1238 | /* |
d8d2416d | 1239 | * Create events associated with an event enabler (if not already present), |
e58095ef | 1240 | * and add backward reference from the event to the enabler. |
8020ceb5 MD |
1241 | */ |
1242 | static | |
d871c65b | 1243 | int lttng_event_enabler_ref_events(struct lttng_event_enabler *event_enabler) |
8020ceb5 | 1244 | { |
d871c65b | 1245 | struct lttng_session *session = event_enabler->chan->session; |
68bb7559 | 1246 | struct lttng_ust_event_private *event_priv; |
e58095ef | 1247 | |
d871c65b | 1248 | if (!lttng_event_enabler_as_enabler(event_enabler)->enabled) |
de713d8a FD |
1249 | goto end; |
1250 | ||
e58095ef | 1251 | /* First ensure that probe events are created for this enabler. */ |
d871c65b | 1252 | lttng_create_event_if_missing(event_enabler); |
e58095ef MD |
1253 | |
1254 | /* For each event matching enabler in session event list. */ | |
bdb12629 | 1255 | cds_list_for_each_entry(event_priv, &session->priv->events_head, node) { |
e58095ef MD |
1256 | struct lttng_enabler_ref *enabler_ref; |
1257 | ||
68bb7559 | 1258 | if (!lttng_event_enabler_match_event(event_enabler, event_priv->pub)) |
e58095ef MD |
1259 | continue; |
1260 | ||
68bb7559 | 1261 | enabler_ref = lttng_enabler_ref(&event_priv->enablers_ref_head, |
d871c65b | 1262 | lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef MD |
1263 | if (!enabler_ref) { |
1264 | /* | |
1265 | * If no backward ref, create it. | |
1266 | * Add backward ref from event to enabler. | |
1267 | */ | |
1268 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1269 | if (!enabler_ref) | |
1270 | return -ENOMEM; | |
d871c65b FD |
1271 | enabler_ref->ref = lttng_event_enabler_as_enabler( |
1272 | event_enabler); | |
e58095ef | 1273 | cds_list_add(&enabler_ref->node, |
68bb7559 | 1274 | &event_priv->enablers_ref_head); |
8165c8da | 1275 | } |
e58095ef MD |
1276 | |
1277 | /* | |
1278 | * Link filter bytecodes if not linked yet. | |
1279 | */ | |
68bb7559 | 1280 | lttng_enabler_link_bytecode(event_priv->desc, |
bdb12629 | 1281 | &session->priv->ctx, |
68bb7559 | 1282 | &event_priv->pub->filter_bytecode_runtime_head, |
621c07fc | 1283 | <tng_event_enabler_as_enabler(event_enabler)->filter_bytecode_head); |
e58095ef MD |
1284 | |
1285 | /* TODO: merge event context. */ | |
1286 | } | |
de713d8a | 1287 | end: |
e58095ef MD |
1288 | return 0; |
1289 | } | |
1290 | ||
1291 | /* | |
1292 | * Called at library load: connect the probe on all enablers matching | |
1293 | * this event. | |
5f733922 | 1294 | * Called with session mutex held. |
e58095ef | 1295 | */ |
5f733922 | 1296 | int lttng_fix_pending_events(void) |
e58095ef | 1297 | { |
bdb12629 | 1298 | struct lttng_ust_session_private *session_priv; |
e58095ef | 1299 | |
bdb12629 MD |
1300 | cds_list_for_each_entry(session_priv, &sessions, node) { |
1301 | lttng_session_lazy_sync_event_enablers(session_priv->pub); | |
8020ceb5 | 1302 | } |
e58095ef MD |
1303 | return 0; |
1304 | } | |
1305 | ||
d8d2416d FD |
1306 | int lttng_fix_pending_event_notifiers(void) |
1307 | { | |
1308 | struct lttng_event_notifier_group *event_notifier_group; | |
1309 | ||
1310 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
1311 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1312 | } | |
1313 | return 0; | |
1314 | } | |
1315 | ||
246be17e | 1316 | /* |
37dddb65 MD |
1317 | * For each session of the owner thread, execute pending statedump. |
1318 | * Only dump state for the sessions owned by the caller thread, because | |
1319 | * we don't keep ust_lock across the entire iteration. | |
246be17e | 1320 | */ |
3327ac33 | 1321 | void lttng_handle_pending_statedump(void *owner) |
246be17e | 1322 | { |
bdb12629 | 1323 | struct lttng_ust_session_private *session_priv; |
246be17e | 1324 | |
37dddb65 | 1325 | /* Execute state dump */ |
cf73e0fe | 1326 | do_lttng_ust_statedump(owner); |
37dddb65 MD |
1327 | |
1328 | /* Clear pending state dump */ | |
3327ac33 MD |
1329 | if (ust_lock()) { |
1330 | goto end; | |
1331 | } | |
bdb12629 MD |
1332 | cds_list_for_each_entry(session_priv, &sessions, node) { |
1333 | if (session_priv->owner != owner) | |
37dddb65 | 1334 | continue; |
bdb12629 | 1335 | if (!session_priv->statedump_pending) |
37dddb65 | 1336 | continue; |
bdb12629 | 1337 | session_priv->statedump_pending = 0; |
246be17e | 1338 | } |
3327ac33 | 1339 | end: |
37dddb65 | 1340 | ust_unlock(); |
3327ac33 | 1341 | return; |
246be17e PW |
1342 | } |
1343 | ||
e58095ef MD |
1344 | /* |
1345 | * Only used internally at session destruction. | |
1346 | */ | |
1347 | static | |
1348 | void _lttng_event_destroy(struct lttng_event *event) | |
1349 | { | |
1350 | struct lttng_enabler_ref *enabler_ref, *tmp_enabler_ref; | |
1351 | ||
35ac38cb | 1352 | /* Remove from event list. */ |
68bb7559 | 1353 | cds_list_del(&event->priv->node); |
35ac38cb | 1354 | /* Remove from event hash table. */ |
68bb7559 | 1355 | cds_hlist_del(&event->priv->hlist); |
35ac38cb | 1356 | |
8020ceb5 | 1357 | lttng_destroy_context(event->ctx); |
f488575f | 1358 | lttng_free_event_filter_runtime(event); |
e58095ef MD |
1359 | /* Free event enabler refs */ |
1360 | cds_list_for_each_entry_safe(enabler_ref, tmp_enabler_ref, | |
68bb7559 | 1361 | &event->priv->enablers_ref_head, node) |
e58095ef | 1362 | free(enabler_ref); |
68bb7559 | 1363 | free(event->priv); |
b5234c06 | 1364 | free(event); |
8020ceb5 MD |
1365 | } |
1366 | ||
c785c634 MD |
1367 | static |
1368 | void _lttng_enum_destroy(struct lttng_enum *_enum) | |
1369 | { | |
1370 | cds_list_del(&_enum->node); | |
35ac38cb | 1371 | cds_hlist_del(&_enum->hlist); |
c785c634 MD |
1372 | free(_enum); |
1373 | } | |
1374 | ||
003fedf4 | 1375 | void lttng_ust_events_exit(void) |
8020ceb5 | 1376 | { |
bdb12629 | 1377 | struct lttng_ust_session_private *session_priv, *tmpsession_priv; |
8020ceb5 | 1378 | |
bdb12629 MD |
1379 | cds_list_for_each_entry_safe(session_priv, tmpsession_priv, &sessions, node) |
1380 | lttng_session_destroy(session_priv->pub); | |
8020ceb5 | 1381 | } |
457a6b58 | 1382 | |
e58095ef MD |
1383 | /* |
1384 | * Enabler management. | |
1385 | */ | |
d871c65b FD |
1386 | struct lttng_event_enabler *lttng_event_enabler_create( |
1387 | enum lttng_enabler_format_type format_type, | |
e58095ef MD |
1388 | struct lttng_ust_event *event_param, |
1389 | struct lttng_channel *chan) | |
457a6b58 | 1390 | { |
d871c65b | 1391 | struct lttng_event_enabler *event_enabler; |
e58095ef | 1392 | |
d871c65b FD |
1393 | event_enabler = zmalloc(sizeof(*event_enabler)); |
1394 | if (!event_enabler) | |
e58095ef | 1395 | return NULL; |
d871c65b FD |
1396 | event_enabler->base.format_type = format_type; |
1397 | CDS_INIT_LIST_HEAD(&event_enabler->base.filter_bytecode_head); | |
1398 | CDS_INIT_LIST_HEAD(&event_enabler->base.excluder_head); | |
1399 | memcpy(&event_enabler->base.event_param, event_param, | |
1400 | sizeof(event_enabler->base.event_param)); | |
1401 | event_enabler->chan = chan; | |
e58095ef | 1402 | /* ctx left NULL */ |
d871c65b | 1403 | event_enabler->base.enabled = 0; |
bdb12629 | 1404 | cds_list_add(&event_enabler->node, &event_enabler->chan->session->priv->enablers_head); |
d871c65b FD |
1405 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); |
1406 | ||
1407 | return event_enabler; | |
457a6b58 MD |
1408 | } |
1409 | ||
d8d2416d FD |
1410 | struct lttng_event_notifier_enabler *lttng_event_notifier_enabler_create( |
1411 | struct lttng_event_notifier_group *event_notifier_group, | |
1412 | enum lttng_enabler_format_type format_type, | |
1413 | struct lttng_ust_event_notifier *event_notifier_param) | |
1414 | { | |
1415 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1416 | ||
1417 | event_notifier_enabler = zmalloc(sizeof(*event_notifier_enabler)); | |
1418 | if (!event_notifier_enabler) | |
1419 | return NULL; | |
1420 | event_notifier_enabler->base.format_type = format_type; | |
1421 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.filter_bytecode_head); | |
d37ecb3f | 1422 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->capture_bytecode_head); |
d8d2416d FD |
1423 | CDS_INIT_LIST_HEAD(&event_notifier_enabler->base.excluder_head); |
1424 | ||
1425 | event_notifier_enabler->user_token = event_notifier_param->event.token; | |
9560f5eb | 1426 | event_notifier_enabler->error_counter_index = event_notifier_param->error_counter_index; |
d37ecb3f | 1427 | event_notifier_enabler->num_captures = 0; |
d8d2416d FD |
1428 | |
1429 | memcpy(&event_notifier_enabler->base.event_param.name, | |
1430 | event_notifier_param->event.name, | |
1431 | sizeof(event_notifier_enabler->base.event_param.name)); | |
1432 | event_notifier_enabler->base.event_param.instrumentation = | |
1433 | event_notifier_param->event.instrumentation; | |
1434 | event_notifier_enabler->base.event_param.loglevel = | |
1435 | event_notifier_param->event.loglevel; | |
1436 | event_notifier_enabler->base.event_param.loglevel_type = | |
1437 | event_notifier_param->event.loglevel_type; | |
1438 | ||
1439 | event_notifier_enabler->base.enabled = 0; | |
1440 | event_notifier_enabler->group = event_notifier_group; | |
1441 | ||
1442 | cds_list_add(&event_notifier_enabler->node, | |
1443 | &event_notifier_group->enablers_head); | |
1444 | ||
1445 | lttng_event_notifier_group_sync_enablers(event_notifier_group); | |
1446 | ||
1447 | return event_notifier_enabler; | |
1448 | } | |
1449 | ||
d871c65b | 1450 | int lttng_event_enabler_enable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1451 | { |
d871c65b FD |
1452 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 1; |
1453 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1454 | ||
e58095ef | 1455 | return 0; |
457a6b58 | 1456 | } |
457a6b58 | 1457 | |
d871c65b | 1458 | int lttng_event_enabler_disable(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1459 | { |
d871c65b FD |
1460 | lttng_event_enabler_as_enabler(event_enabler)->enabled = 0; |
1461 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
1462 | ||
e58095ef MD |
1463 | return 0; |
1464 | } | |
457a6b58 | 1465 | |
d871c65b | 1466 | static |
a56fd376 | 1467 | void _lttng_enabler_attach_filter_bytecode(struct lttng_enabler *enabler, |
ab89263e | 1468 | struct lttng_ust_bytecode_node **bytecode) |
e58095ef | 1469 | { |
ab89263e MD |
1470 | (*bytecode)->enabler = enabler; |
1471 | cds_list_add_tail(&(*bytecode)->node, &enabler->filter_bytecode_head); | |
1472 | /* Take ownership of bytecode */ | |
1473 | *bytecode = NULL; | |
d871c65b FD |
1474 | } |
1475 | ||
a56fd376 | 1476 | int lttng_event_enabler_attach_filter_bytecode(struct lttng_event_enabler *event_enabler, |
ab89263e | 1477 | struct lttng_ust_bytecode_node **bytecode) |
d871c65b | 1478 | { |
a56fd376 | 1479 | _lttng_enabler_attach_filter_bytecode( |
d871c65b FD |
1480 | lttng_event_enabler_as_enabler(event_enabler), bytecode); |
1481 | ||
1482 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
e58095ef | 1483 | return 0; |
0bfb5cbd JI |
1484 | } |
1485 | ||
d871c65b FD |
1486 | static |
1487 | void _lttng_enabler_attach_exclusion(struct lttng_enabler *enabler, | |
e9fe6aad | 1488 | struct lttng_ust_excluder_node **excluder) |
0bfb5cbd | 1489 | { |
e9fe6aad MD |
1490 | (*excluder)->enabler = enabler; |
1491 | cds_list_add_tail(&(*excluder)->node, &enabler->excluder_head); | |
1492 | /* Take ownership of excluder */ | |
1493 | *excluder = NULL; | |
d871c65b FD |
1494 | } |
1495 | ||
1496 | int lttng_event_enabler_attach_exclusion(struct lttng_event_enabler *event_enabler, | |
e9fe6aad | 1497 | struct lttng_ust_excluder_node **excluder) |
d871c65b FD |
1498 | { |
1499 | _lttng_enabler_attach_exclusion( | |
1500 | lttng_event_enabler_as_enabler(event_enabler), excluder); | |
1501 | ||
1502 | lttng_session_lazy_sync_event_enablers(event_enabler->chan->session); | |
0bfb5cbd | 1503 | return 0; |
e58095ef | 1504 | } |
f488575f | 1505 | |
d8d2416d FD |
1506 | int lttng_event_notifier_enabler_enable( |
1507 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1508 | { | |
1509 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 1; | |
1510 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1511 | ||
1512 | return 0; | |
1513 | } | |
1514 | ||
1515 | int lttng_event_notifier_enabler_disable( | |
1516 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1517 | { | |
1518 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled = 0; | |
1519 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1520 | ||
1521 | return 0; | |
1522 | } | |
1523 | ||
a56fd376 | 1524 | int lttng_event_notifier_enabler_attach_filter_bytecode( |
d8d2416d | 1525 | struct lttng_event_notifier_enabler *event_notifier_enabler, |
ab89263e | 1526 | struct lttng_ust_bytecode_node **bytecode) |
d8d2416d | 1527 | { |
a56fd376 | 1528 | _lttng_enabler_attach_filter_bytecode( |
d8d2416d FD |
1529 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), |
1530 | bytecode); | |
1531 | ||
1532 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1533 | return 0; | |
1534 | } | |
1535 | ||
d37ecb3f FD |
1536 | int lttng_event_notifier_enabler_attach_capture_bytecode( |
1537 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
49cde654 | 1538 | struct lttng_ust_bytecode_node **bytecode) |
d37ecb3f | 1539 | { |
49cde654 | 1540 | (*bytecode)->enabler = lttng_event_notifier_enabler_as_enabler( |
d37ecb3f | 1541 | event_notifier_enabler); |
49cde654 | 1542 | cds_list_add_tail(&(*bytecode)->node, |
d37ecb3f | 1543 | &event_notifier_enabler->capture_bytecode_head); |
49cde654 MD |
1544 | /* Take ownership of bytecode */ |
1545 | *bytecode = NULL; | |
d37ecb3f FD |
1546 | event_notifier_enabler->num_captures++; |
1547 | ||
1548 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1549 | return 0; | |
1550 | } | |
1551 | ||
d8d2416d FD |
1552 | int lttng_event_notifier_enabler_attach_exclusion( |
1553 | struct lttng_event_notifier_enabler *event_notifier_enabler, | |
e9fe6aad | 1554 | struct lttng_ust_excluder_node **excluder) |
d8d2416d FD |
1555 | { |
1556 | _lttng_enabler_attach_exclusion( | |
1557 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler), | |
1558 | excluder); | |
1559 | ||
1560 | lttng_event_notifier_group_sync_enablers(event_notifier_enabler->group); | |
1561 | return 0; | |
1562 | } | |
1563 | ||
e58095ef | 1564 | int lttng_attach_context(struct lttng_ust_context *context_param, |
8e696cfa | 1565 | union ust_args *uargs, |
e58095ef MD |
1566 | struct lttng_ctx **ctx, struct lttng_session *session) |
1567 | { | |
457a6b58 | 1568 | /* |
e58095ef MD |
1569 | * We cannot attach a context after trace has been started for a |
1570 | * session because the metadata does not allow expressing this | |
1571 | * information outside of the original channel scope. | |
457a6b58 | 1572 | */ |
bdb12629 | 1573 | if (session->priv->been_active) |
e58095ef | 1574 | return -EPERM; |
457a6b58 | 1575 | |
e58095ef MD |
1576 | switch (context_param->ctx) { |
1577 | case LTTNG_UST_CONTEXT_PTHREAD_ID: | |
1578 | return lttng_add_pthread_id_to_ctx(ctx); | |
d58d1454 MD |
1579 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
1580 | { | |
1581 | struct lttng_ust_perf_counter_ctx *perf_ctx_param; | |
1582 | ||
1583 | perf_ctx_param = &context_param->u.perf_counter; | |
1584 | return lttng_add_perf_counter_to_ctx( | |
1585 | perf_ctx_param->type, | |
1586 | perf_ctx_param->config, | |
1587 | perf_ctx_param->name, | |
1588 | ctx); | |
1589 | } | |
e58095ef MD |
1590 | case LTTNG_UST_CONTEXT_VTID: |
1591 | return lttng_add_vtid_to_ctx(ctx); | |
1592 | case LTTNG_UST_CONTEXT_VPID: | |
1593 | return lttng_add_vpid_to_ctx(ctx); | |
1594 | case LTTNG_UST_CONTEXT_PROCNAME: | |
1595 | return lttng_add_procname_to_ctx(ctx); | |
96f85541 MD |
1596 | case LTTNG_UST_CONTEXT_IP: |
1597 | return lttng_add_ip_to_ctx(ctx); | |
c7ea8487 MD |
1598 | case LTTNG_UST_CONTEXT_CPU_ID: |
1599 | return lttng_add_cpu_id_to_ctx(ctx); | |
8e696cfa MD |
1600 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
1601 | return lttng_ust_add_app_context_to_ctx_rcu(uargs->app_context.ctxname, | |
1602 | ctx); | |
735bef47 MJ |
1603 | case LTTNG_UST_CONTEXT_CGROUP_NS: |
1604 | return lttng_add_cgroup_ns_to_ctx(ctx); | |
1605 | case LTTNG_UST_CONTEXT_IPC_NS: | |
1606 | return lttng_add_ipc_ns_to_ctx(ctx); | |
1607 | case LTTNG_UST_CONTEXT_MNT_NS: | |
1608 | return lttng_add_mnt_ns_to_ctx(ctx); | |
1609 | case LTTNG_UST_CONTEXT_NET_NS: | |
1610 | return lttng_add_net_ns_to_ctx(ctx); | |
1611 | case LTTNG_UST_CONTEXT_PID_NS: | |
1612 | return lttng_add_pid_ns_to_ctx(ctx); | |
cefef7a7 MJ |
1613 | case LTTNG_UST_CONTEXT_TIME_NS: |
1614 | return lttng_add_time_ns_to_ctx(ctx); | |
735bef47 MJ |
1615 | case LTTNG_UST_CONTEXT_USER_NS: |
1616 | return lttng_add_user_ns_to_ctx(ctx); | |
1617 | case LTTNG_UST_CONTEXT_UTS_NS: | |
1618 | return lttng_add_uts_ns_to_ctx(ctx); | |
fca2f191 MJ |
1619 | case LTTNG_UST_CONTEXT_VUID: |
1620 | return lttng_add_vuid_to_ctx(ctx); | |
1621 | case LTTNG_UST_CONTEXT_VEUID: | |
1622 | return lttng_add_veuid_to_ctx(ctx); | |
1623 | case LTTNG_UST_CONTEXT_VSUID: | |
1624 | return lttng_add_vsuid_to_ctx(ctx); | |
1625 | case LTTNG_UST_CONTEXT_VGID: | |
1626 | return lttng_add_vgid_to_ctx(ctx); | |
1627 | case LTTNG_UST_CONTEXT_VEGID: | |
1628 | return lttng_add_vegid_to_ctx(ctx); | |
1629 | case LTTNG_UST_CONTEXT_VSGID: | |
1630 | return lttng_add_vsgid_to_ctx(ctx); | |
e58095ef MD |
1631 | default: |
1632 | return -EINVAL; | |
457a6b58 | 1633 | } |
457a6b58 MD |
1634 | } |
1635 | ||
d871c65b | 1636 | int lttng_event_enabler_attach_context(struct lttng_event_enabler *enabler, |
e58095ef | 1637 | struct lttng_ust_context *context_param) |
457a6b58 | 1638 | { |
e58095ef | 1639 | return -ENOSYS; |
457a6b58 MD |
1640 | } |
1641 | ||
d871c65b | 1642 | void lttng_event_enabler_destroy(struct lttng_event_enabler *event_enabler) |
457a6b58 | 1643 | { |
d871c65b FD |
1644 | if (!event_enabler) { |
1645 | return; | |
0f63324a | 1646 | } |
d871c65b | 1647 | cds_list_del(&event_enabler->node); |
0f63324a | 1648 | |
d871c65b | 1649 | lttng_enabler_destroy(lttng_event_enabler_as_enabler(event_enabler)); |
e58095ef | 1650 | |
d871c65b FD |
1651 | lttng_destroy_context(event_enabler->ctx); |
1652 | free(event_enabler); | |
457a6b58 MD |
1653 | } |
1654 | ||
e58095ef | 1655 | /* |
d871c65b | 1656 | * lttng_session_sync_event_enablers should be called just before starting a |
e58095ef MD |
1657 | * session. |
1658 | */ | |
457a6b58 | 1659 | static |
d871c65b | 1660 | void lttng_session_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1661 | { |
d871c65b | 1662 | struct lttng_event_enabler *event_enabler; |
68bb7559 | 1663 | struct lttng_ust_event_private *event_priv; |
457a6b58 | 1664 | |
bdb12629 | 1665 | cds_list_for_each_entry(event_enabler, &session->priv->enablers_head, node) |
d871c65b | 1666 | lttng_event_enabler_ref_events(event_enabler); |
e58095ef MD |
1667 | /* |
1668 | * For each event, if at least one of its enablers is enabled, | |
ac6b4ac6 MD |
1669 | * and its channel and session transient states are enabled, we |
1670 | * enable the event, else we disable it. | |
e58095ef | 1671 | */ |
bdb12629 | 1672 | cds_list_for_each_entry(event_priv, &session->priv->events_head, node) { |
e58095ef MD |
1673 | struct lttng_enabler_ref *enabler_ref; |
1674 | struct lttng_bytecode_runtime *runtime; | |
dcdeaff0 | 1675 | int enabled = 0, has_enablers_without_bytecode = 0; |
e58095ef MD |
1676 | |
1677 | /* Enable events */ | |
1678 | cds_list_for_each_entry(enabler_ref, | |
68bb7559 | 1679 | &event_priv->enablers_ref_head, node) { |
e58095ef MD |
1680 | if (enabler_ref->ref->enabled) { |
1681 | enabled = 1; | |
1682 | break; | |
1683 | } | |
1684 | } | |
ac6b4ac6 MD |
1685 | /* |
1686 | * Enabled state is based on union of enablers, with | |
1687 | * intesection of session and channel transient enable | |
1688 | * states. | |
1689 | */ | |
bdb12629 | 1690 | enabled = enabled && session->priv->tstate && event_priv->pub->chan->tstate; |
ac6b4ac6 | 1691 | |
68bb7559 | 1692 | CMM_STORE_SHARED(event_priv->pub->enabled, enabled); |
ac6b4ac6 MD |
1693 | /* |
1694 | * Sync tracepoint registration with event enabled | |
1695 | * state. | |
1696 | */ | |
1697 | if (enabled) { | |
68bb7559 MD |
1698 | if (!event_priv->registered) |
1699 | register_event(event_priv->pub); | |
ac6b4ac6 | 1700 | } else { |
68bb7559 MD |
1701 | if (event_priv->registered) |
1702 | unregister_event(event_priv->pub); | |
ac6b4ac6 | 1703 | } |
457a6b58 | 1704 | |
1f49fc05 | 1705 | /* Check if has enablers without bytecode enabled */ |
dcdeaff0 | 1706 | cds_list_for_each_entry(enabler_ref, |
68bb7559 | 1707 | &event_priv->enablers_ref_head, node) { |
1f49fc05 MD |
1708 | if (enabler_ref->ref->enabled |
1709 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
dcdeaff0 MD |
1710 | has_enablers_without_bytecode = 1; |
1711 | break; | |
1712 | } | |
1713 | } | |
68bb7559 | 1714 | event_priv->pub->has_enablers_without_bytecode = |
dcdeaff0 MD |
1715 | has_enablers_without_bytecode; |
1716 | ||
e58095ef MD |
1717 | /* Enable filters */ |
1718 | cds_list_for_each_entry(runtime, | |
68bb7559 | 1719 | &event_priv->pub->filter_bytecode_runtime_head, node) { |
4d451c15 | 1720 | lttng_bytecode_filter_sync_state(runtime); |
457a6b58 MD |
1721 | } |
1722 | } | |
baa1e0bc | 1723 | __tracepoint_probe_prune_release_queue(); |
457a6b58 MD |
1724 | } |
1725 | ||
4296085e MD |
1726 | /* Support for event notifier is introduced by probe provider major version 2. */ |
1727 | static | |
1728 | bool lttng_ust_probe_supports_event_notifier(struct lttng_probe_desc *probe_desc) | |
1729 | { | |
1730 | return probe_desc->major >= 2; | |
1731 | } | |
1732 | ||
d8d2416d FD |
1733 | static |
1734 | void lttng_create_event_notifier_if_missing( | |
1735 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1736 | { | |
1737 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1738 | struct lttng_probe_desc *probe_desc; | |
1739 | struct cds_list_head *probe_list; | |
1740 | int i; | |
1741 | ||
1742 | probe_list = lttng_get_probe_list_head(); | |
1743 | ||
1744 | cds_list_for_each_entry(probe_desc, probe_list, head) { | |
1745 | for (i = 0; i < probe_desc->nr_events; i++) { | |
1746 | int ret; | |
1747 | bool found = false; | |
1748 | const struct lttng_event_desc *desc; | |
1749 | struct lttng_event_notifier *event_notifier; | |
1750 | struct cds_hlist_head *head; | |
1751 | struct cds_hlist_node *node; | |
1752 | ||
1753 | desc = probe_desc->event_desc[i]; | |
d37ecb3f | 1754 | |
d8d2416d FD |
1755 | if (!lttng_desc_match_enabler(desc, |
1756 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler))) | |
1757 | continue; | |
1758 | ||
1759 | /* | |
1760 | * Given the current event_notifier group, get the bucket that | |
1761 | * the target event_notifier would be if it was already | |
1762 | * created. | |
1763 | */ | |
1764 | head = borrow_hash_table_bucket( | |
1765 | event_notifier_group->event_notifiers_ht.table, | |
1766 | LTTNG_UST_EVENT_NOTIFIER_HT_SIZE, desc); | |
1767 | ||
1768 | cds_hlist_for_each_entry(event_notifier, node, head, hlist) { | |
1769 | /* | |
1770 | * Check if event_notifier already exists by checking | |
1771 | * if the event_notifier and enabler share the same | |
1772 | * description and id. | |
1773 | */ | |
1774 | if (event_notifier->desc == desc && | |
1775 | event_notifier->user_token == event_notifier_enabler->user_token) { | |
1776 | found = true; | |
1777 | break; | |
1778 | } | |
1779 | } | |
1780 | ||
1781 | if (found) | |
1782 | continue; | |
1783 | ||
4296085e MD |
1784 | /* Check that the probe supports event notifiers, else report the error. */ |
1785 | if (!lttng_ust_probe_supports_event_notifier(probe_desc)) { | |
1786 | ERR("Probe \"%s\" contains event \"%s\" which matches an enabled event notifier, " | |
1787 | "but its version (%u.%u) is too old and does not implement event notifiers. " | |
1788 | "It needs to be recompiled against a newer version of LTTng-UST, otherwise " | |
1789 | "this event will not generate any notification.", | |
1790 | probe_desc->provider, | |
1791 | desc->name, | |
1792 | probe_desc->major, | |
1793 | probe_desc->minor); | |
1794 | continue; | |
1795 | } | |
d8d2416d FD |
1796 | /* |
1797 | * We need to create a event_notifier for this event probe. | |
1798 | */ | |
1799 | ret = lttng_event_notifier_create(desc, | |
1800 | event_notifier_enabler->user_token, | |
6566528b | 1801 | event_notifier_enabler->error_counter_index, |
d8d2416d FD |
1802 | event_notifier_group); |
1803 | if (ret) { | |
1804 | DBG("Unable to create event_notifier %s, error %d\n", | |
1805 | probe_desc->event_desc[i]->name, ret); | |
1806 | } | |
1807 | } | |
1808 | } | |
1809 | } | |
1810 | ||
1811 | /* | |
1812 | * Create event_notifiers associated with a event_notifier enabler (if not already present). | |
1813 | */ | |
1814 | static | |
1815 | int lttng_event_notifier_enabler_ref_event_notifiers( | |
1816 | struct lttng_event_notifier_enabler *event_notifier_enabler) | |
1817 | { | |
1818 | struct lttng_event_notifier_group *event_notifier_group = event_notifier_enabler->group; | |
1819 | struct lttng_event_notifier *event_notifier; | |
1820 | ||
1821 | /* | |
1822 | * Only try to create event_notifiers for enablers that are enabled, the user | |
1823 | * might still be attaching filter or exclusion to the | |
1824 | * event_notifier_enabler. | |
1825 | */ | |
1826 | if (!lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)->enabled) | |
1827 | goto end; | |
1828 | ||
1829 | /* First, ensure that probe event_notifiers are created for this enabler. */ | |
1830 | lttng_create_event_notifier_if_missing(event_notifier_enabler); | |
1831 | ||
1832 | /* Link the created event_notifier with its associated enabler. */ | |
1833 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1834 | struct lttng_enabler_ref *enabler_ref; | |
1835 | ||
1836 | if (!lttng_event_notifier_enabler_match_event_notifier(event_notifier_enabler, event_notifier)) | |
1837 | continue; | |
1838 | ||
1839 | enabler_ref = lttng_enabler_ref(&event_notifier->enablers_ref_head, | |
1840 | lttng_event_notifier_enabler_as_enabler(event_notifier_enabler)); | |
1841 | if (!enabler_ref) { | |
1842 | /* | |
1843 | * If no backward ref, create it. | |
1844 | * Add backward ref from event_notifier to enabler. | |
1845 | */ | |
1846 | enabler_ref = zmalloc(sizeof(*enabler_ref)); | |
1847 | if (!enabler_ref) | |
1848 | return -ENOMEM; | |
1849 | ||
1850 | enabler_ref->ref = lttng_event_notifier_enabler_as_enabler( | |
1851 | event_notifier_enabler); | |
1852 | cds_list_add(&enabler_ref->node, | |
1853 | &event_notifier->enablers_ref_head); | |
1854 | } | |
1855 | ||
1856 | /* | |
1857 | * Link filter bytecodes if not linked yet. | |
1858 | */ | |
1859 | lttng_enabler_link_bytecode(event_notifier->desc, | |
621c07fc FD |
1860 | &event_notifier_group->ctx, |
1861 | &event_notifier->filter_bytecode_runtime_head, | |
1862 | <tng_event_notifier_enabler_as_enabler(event_notifier_enabler)->filter_bytecode_head); | |
d37ecb3f FD |
1863 | |
1864 | /* | |
1865 | * Link capture bytecodes if not linked yet. | |
1866 | */ | |
1867 | lttng_enabler_link_bytecode(event_notifier->desc, | |
1868 | &event_notifier_group->ctx, &event_notifier->capture_bytecode_runtime_head, | |
1869 | &event_notifier_enabler->capture_bytecode_head); | |
1870 | ||
1871 | event_notifier->num_captures = event_notifier_enabler->num_captures; | |
d8d2416d FD |
1872 | } |
1873 | end: | |
1874 | return 0; | |
1875 | } | |
1876 | ||
1877 | static | |
1878 | void lttng_event_notifier_group_sync_enablers(struct lttng_event_notifier_group *event_notifier_group) | |
1879 | { | |
1880 | struct lttng_event_notifier_enabler *event_notifier_enabler; | |
1881 | struct lttng_event_notifier *event_notifier; | |
1882 | ||
1883 | cds_list_for_each_entry(event_notifier_enabler, &event_notifier_group->enablers_head, node) | |
1884 | lttng_event_notifier_enabler_ref_event_notifiers(event_notifier_enabler); | |
1885 | ||
1886 | /* | |
1887 | * For each event_notifier, if at least one of its enablers is enabled, | |
1888 | * we enable the event_notifier, else we disable it. | |
1889 | */ | |
1890 | cds_list_for_each_entry(event_notifier, &event_notifier_group->event_notifiers_head, node) { | |
1891 | struct lttng_enabler_ref *enabler_ref; | |
1892 | struct lttng_bytecode_runtime *runtime; | |
1893 | int enabled = 0, has_enablers_without_bytecode = 0; | |
1894 | ||
1895 | /* Enable event_notifiers */ | |
1896 | cds_list_for_each_entry(enabler_ref, | |
1897 | &event_notifier->enablers_ref_head, node) { | |
1898 | if (enabler_ref->ref->enabled) { | |
1899 | enabled = 1; | |
1900 | break; | |
1901 | } | |
1902 | } | |
1903 | ||
1904 | CMM_STORE_SHARED(event_notifier->enabled, enabled); | |
1905 | /* | |
1906 | * Sync tracepoint registration with event_notifier enabled | |
1907 | * state. | |
1908 | */ | |
1909 | if (enabled) { | |
1910 | if (!event_notifier->registered) | |
1911 | register_event_notifier(event_notifier); | |
1912 | } else { | |
1913 | if (event_notifier->registered) | |
1914 | unregister_event_notifier(event_notifier); | |
1915 | } | |
1916 | ||
1917 | /* Check if has enablers without bytecode enabled */ | |
1918 | cds_list_for_each_entry(enabler_ref, | |
1919 | &event_notifier->enablers_ref_head, node) { | |
1920 | if (enabler_ref->ref->enabled | |
1921 | && cds_list_empty(&enabler_ref->ref->filter_bytecode_head)) { | |
1922 | has_enablers_without_bytecode = 1; | |
1923 | break; | |
1924 | } | |
1925 | } | |
1926 | event_notifier->has_enablers_without_bytecode = | |
1927 | has_enablers_without_bytecode; | |
1928 | ||
1929 | /* Enable filters */ | |
1930 | cds_list_for_each_entry(runtime, | |
1931 | &event_notifier->filter_bytecode_runtime_head, node) { | |
4d451c15 | 1932 | lttng_bytecode_filter_sync_state(runtime); |
d8d2416d | 1933 | } |
d37ecb3f FD |
1934 | |
1935 | /* Enable captures. */ | |
1936 | cds_list_for_each_entry(runtime, | |
1937 | &event_notifier->capture_bytecode_runtime_head, node) { | |
1938 | lttng_bytecode_capture_sync_state(runtime); | |
1939 | } | |
d8d2416d FD |
1940 | } |
1941 | __tracepoint_probe_prune_release_queue(); | |
1942 | } | |
1943 | ||
e58095ef MD |
1944 | /* |
1945 | * Apply enablers to session events, adding events to session if need | |
1946 | * be. It is required after each modification applied to an active | |
1947 | * session, and right before session "start". | |
1948 | * "lazy" sync means we only sync if required. | |
1949 | */ | |
1950 | static | |
d871c65b | 1951 | void lttng_session_lazy_sync_event_enablers(struct lttng_session *session) |
457a6b58 | 1952 | { |
e58095ef MD |
1953 | /* We can skip if session is not active */ |
1954 | if (!session->active) | |
1955 | return; | |
d871c65b | 1956 | lttng_session_sync_event_enablers(session); |
457a6b58 | 1957 | } |
53569322 MD |
1958 | |
1959 | /* | |
1960 | * Update all sessions with the given app context. | |
1961 | * Called with ust lock held. | |
1962 | * This is invoked when an application context gets loaded/unloaded. It | |
1963 | * ensures the context callbacks are in sync with the application | |
1964 | * context (either app context callbacks, or dummy callbacks). | |
1965 | */ | |
1966 | void lttng_ust_context_set_session_provider(const char *name, | |
1967 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
1968 | void (*record)(struct lttng_ctx_field *field, | |
1969 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
1970 | struct lttng_channel *chan), | |
1971 | void (*get_value)(struct lttng_ctx_field *field, | |
1972 | struct lttng_ctx_value *value)) | |
1973 | { | |
bdb12629 | 1974 | struct lttng_ust_session_private *session_priv; |
53569322 | 1975 | |
bdb12629 | 1976 | cds_list_for_each_entry(session_priv, &sessions, node) { |
53569322 | 1977 | struct lttng_channel *chan; |
68bb7559 | 1978 | struct lttng_ust_event_private *event_priv; |
53569322 MD |
1979 | int ret; |
1980 | ||
bdb12629 | 1981 | ret = lttng_ust_context_set_provider_rcu(&session_priv->ctx, |
53569322 MD |
1982 | name, get_size, record, get_value); |
1983 | if (ret) | |
1984 | abort(); | |
bdb12629 | 1985 | cds_list_for_each_entry(chan, &session_priv->chan_head, node) { |
53569322 MD |
1986 | ret = lttng_ust_context_set_provider_rcu(&chan->ctx, |
1987 | name, get_size, record, get_value); | |
1988 | if (ret) | |
1989 | abort(); | |
1990 | } | |
bdb12629 | 1991 | cds_list_for_each_entry(event_priv, &session_priv->events_head, node) { |
68bb7559 | 1992 | ret = lttng_ust_context_set_provider_rcu(&event_priv->pub->ctx, |
53569322 MD |
1993 | name, get_size, record, get_value); |
1994 | if (ret) | |
1995 | abort(); | |
1996 | } | |
1997 | } | |
1998 | } | |
d8d2416d FD |
1999 | |
2000 | /* | |
2001 | * Update all event_notifier groups with the given app context. | |
2002 | * Called with ust lock held. | |
2003 | * This is invoked when an application context gets loaded/unloaded. It | |
2004 | * ensures the context callbacks are in sync with the application | |
2005 | * context (either app context callbacks, or dummy callbacks). | |
2006 | */ | |
2007 | void lttng_ust_context_set_event_notifier_group_provider(const char *name, | |
2008 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
2009 | void (*record)(struct lttng_ctx_field *field, | |
2010 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
2011 | struct lttng_channel *chan), | |
2012 | void (*get_value)(struct lttng_ctx_field *field, | |
2013 | struct lttng_ctx_value *value)) | |
2014 | { | |
2015 | struct lttng_event_notifier_group *event_notifier_group; | |
2016 | ||
2017 | cds_list_for_each_entry(event_notifier_group, &event_notifier_groups, node) { | |
2018 | int ret; | |
2019 | ||
2020 | ret = lttng_ust_context_set_provider_rcu( | |
2021 | &event_notifier_group->ctx, | |
2022 | name, get_size, record, get_value); | |
2023 | if (ret) | |
2024 | abort(); | |
2025 | } | |
2026 | } |