Rename lttng_condition_event_rule to lttng_condition_on_event
[lttng-tools.git] / src / bin / lttng-sessiond / event.c
CommitLineData
54d01ffb 1/*
ab5be9fa
MJ
2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
54d01ffb 4 *
ab5be9fa 5 * SPDX-License-Identifier: GPL-2.0-only
54d01ffb 6 *
54d01ffb
DG
7 */
8
6c1c0768 9#define _LGPL_SOURCE
54d01ffb 10#include <urcu/list.h>
2bdd86d4 11#include <string.h>
54d01ffb 12
edf4b93e 13#include <common/compat/errno.h>
54d01ffb 14#include <lttng/lttng.h>
44760c20
JR
15#include <lttng/condition/condition.h>
16#include <lttng/condition/event-rule.h>
17#include <lttng/event-rule/event-rule.h>
18#include <lttng/event-rule/event-rule-internal.h>
763f0d4c 19#include <common/bytecode/bytecode.h>
db758600 20#include <common/error.h>
10a8a223 21#include <common/sessiond-comm/sessiond-comm.h>
71a559f8
JG
22#include <common/filter.h>
23#include <common/context.h>
54d01ffb
DG
24
25#include "channel.h"
26#include "event.h"
4771f025 27#include "kernel.h"
be6a6276 28#include "lttng-sessiond.h"
75018ab6
JG
29#include "lttng-ust-ctl.h"
30#include "lttng-ust-error.h"
edb67388
DG
31#include "ust-app.h"
32#include "trace-kernel.h"
33#include "trace-ust.h"
7c1d2758 34#include "agent.h"
44760c20 35#include "utils.h"
54d01ffb 36
025faf73
DG
37/*
38 * Add unique UST event based on the event name, filter bytecode and loglevel.
39 */
18eace3b
DG
40static void add_unique_ust_event(struct lttng_ht *ht,
41 struct ltt_ust_event *event)
42{
43 struct cds_lfht_node *node_ptr;
44 struct ltt_ust_ht_key key;
45
46 assert(ht);
47 assert(ht->ht);
48 assert(event);
49
50 key.name = event->attr.name;
2b00d462 51 key.filter = (struct lttng_bytecode *) event->filter;
b953b8cd
PP
52 key.loglevel_type = event->attr.loglevel_type;
53 key.loglevel_value = event->attr.loglevel;
4031e53e 54 key.exclusion = event->exclusion;
18eace3b
DG
55
56 node_ptr = cds_lfht_add_unique(ht->ht,
57 ht->hash_fct(event->node.key, lttng_ht_seed),
58 trace_ust_ht_match_event, &key, &event->node.node);
59 assert(node_ptr == &event->node.node);
60}
61
54d01ffb 62/*
9550ee81
JR
63 * Disable kernel tracepoint events for a channel from the kernel session of
64 * a specified event_name and event type.
65 * On type LTTNG_EVENT_ALL all events with event_name are disabled.
66 * If event_name is NULL all events of the specified type are disabled.
54d01ffb 67 */
d0ae4ea8 68int event_kernel_disable_event(struct ltt_kernel_channel *kchan,
df4f5a87 69 const char *event_name, enum lttng_event_type type)
54d01ffb 70{
9550ee81 71 int ret, error = 0, found = 0;
54d01ffb
DG
72 struct ltt_kernel_event *kevent;
73
0525e9ae
DG
74 assert(kchan);
75
54d01ffb
DG
76 /* For each event in the kernel session */
77 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
d0ae4ea8
MD
78 if (type != LTTNG_EVENT_ALL && kevent->type != type)
79 continue;
9550ee81
JR
80 if (event_name != NULL && strcmp(event_name, kevent->event->name)) {
81 continue;
82 }
83 found++;
54d01ffb
DG
84 ret = kernel_disable_event(kevent);
85 if (ret < 0) {
9550ee81 86 error = 1;
54d01ffb
DG
87 continue;
88 }
89 }
9550ee81
JR
90 DBG("Disable kernel event: found %d events with name: %s and type: %d",
91 found, event_name ? event_name : "NULL", type);
7a3d1328 92
9550ee81
JR
93 if (event_name != NULL && !found) {
94 ret = LTTNG_ERR_NO_EVENT;
95 } else {
96 ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK;
97 }
98
99 return ret;
54d01ffb
DG
100}
101
102/*
7a3d1328 103 * Enable kernel tracepoint event for a channel from the kernel session.
49d21f93 104 * We own filter_expression and filter.
54d01ffb 105 */
d0ae4ea8 106int event_kernel_enable_event(struct ltt_kernel_channel *kchan,
00a62084 107 struct lttng_event *event, char *filter_expression,
2b00d462 108 struct lttng_bytecode *filter)
54d01ffb
DG
109{
110 int ret;
111 struct ltt_kernel_event *kevent;
112
0525e9ae
DG
113 assert(kchan);
114 assert(event);
115
00a62084
MD
116 kevent = trace_kernel_find_event(event->name, kchan,
117 event->type, filter);
54d01ffb 118 if (kevent == NULL) {
71a3bb01 119 ret = kernel_create_event(event, kchan, filter_expression, filter);
a969e101
MD
120 /* We have passed ownership */
121 filter_expression = NULL;
122 filter = NULL;
71a3bb01 123 if (ret) {
7a3d1328 124 goto end;
54d01ffb
DG
125 }
126 } else if (kevent->enabled == 0) {
127 ret = kernel_enable_event(kevent);
128 if (ret < 0) {
f73fabfd 129 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
7a3d1328 130 goto end;
54d01ffb 131 }
42224349
DG
132 } else {
133 /* At this point, the event is considered enabled */
f73fabfd 134 ret = LTTNG_ERR_KERN_EVENT_EXIST;
42224349 135 goto end;
54d01ffb 136 }
42224349 137
f73fabfd 138 ret = LTTNG_OK;
7a3d1328 139end:
a969e101
MD
140 free(filter_expression);
141 free(filter);
54d01ffb
DG
142 return ret;
143}
144
7f79d3a1
DG
145/*
146 * ============================
147 * UST : The Ultimate Frontier!
148 * ============================
149 */
150
2bdd86d4
MD
151/*
152 * Enable UST tracepoint event for a channel from a UST session.
49d21f93 153 * We own filter_expression, filter, and exclusion.
2bdd86d4 154 */
7972aab2 155int event_ust_enable_tracepoint(struct ltt_ust_session *usess,
025faf73 156 struct ltt_ust_channel *uchan, struct lttng_event *event,
6b453b5e 157 char *filter_expression,
2b00d462 158 struct lttng_bytecode *filter,
88f06f15
JG
159 struct lttng_event_exclusion *exclusion,
160 bool internal_event)
2bdd86d4 161{
88e3c2f5 162 int ret = LTTNG_OK, to_create = 0;
edb67388
DG
163 struct ltt_ust_event *uevent;
164
0525e9ae
DG
165 assert(usess);
166 assert(uchan);
167 assert(event);
168
18eace3b
DG
169 rcu_read_lock();
170
025faf73 171 uevent = trace_ust_find_event(uchan->events, event->name, filter,
fc4b93fa 172 (enum lttng_ust_abi_loglevel_type) event->loglevel_type,
abda88ad 173 event->loglevel, exclusion);
87c6e328 174 if (!uevent) {
39687410
FD
175 ret = trace_ust_create_event(event, filter_expression,
176 filter, exclusion, internal_event, &uevent);
49d21f93
MD
177 /* We have passed ownership */
178 filter_expression = NULL;
179 filter = NULL;
180 exclusion = NULL;
39687410 181 if (ret != LTTNG_OK) {
edb67388
DG
182 goto error;
183 }
025faf73 184
fc34caaa 185 /* Valid to set it after the goto error since uevent is still NULL */
edb67388
DG
186 to_create = 1;
187 }
2bdd86d4 188
7f79d3a1
DG
189 if (uevent->enabled) {
190 /* It's already enabled so everything is OK */
0359fdbc 191 assert(!to_create);
5bcdda4f 192 ret = LTTNG_ERR_UST_EVENT_ENABLED;
7f79d3a1
DG
193 goto end;
194 }
195
fc34caaa 196 uevent->enabled = 1;
88e3c2f5
JG
197 if (to_create) {
198 /* Add ltt ust event to channel */
199 add_unique_ust_event(uchan->events, uevent);
200 }
201
202 if (!usess->active) {
203 goto end;
204 }
fc34caaa 205
7972aab2
DG
206 if (to_create) {
207 /* Create event on all UST registered apps for session */
208 ret = ust_app_create_event_glb(usess, uchan, uevent);
209 } else {
210 /* Enable event on all UST registered apps for session */
211 ret = ust_app_enable_event_glb(usess, uchan, uevent);
212 }
48842b30 213
7972aab2
DG
214 if (ret < 0) {
215 if (ret == -LTTNG_UST_ERR_EXIST) {
216 ret = LTTNG_ERR_UST_EVENT_EXIST;
217 goto end;
218 } else {
219 ret = LTTNG_ERR_UST_ENABLE_FAIL;
220 goto error;
edb67388 221 }
2bdd86d4 222 }
48842b30 223
7f79d3a1
DG
224 DBG("Event UST %s %s in channel %s", uevent->attr.name,
225 to_create ? "created" : "enabled", uchan->name);
226
f73fabfd 227 ret = LTTNG_OK;
fc34caaa 228
fb89d070 229end:
18eace3b 230 rcu_read_unlock();
49d21f93
MD
231 free(filter_expression);
232 free(filter);
233 free(exclusion);
fc34caaa 234 return ret;
edb67388
DG
235
236error:
fc34caaa
DG
237 /*
238 * Only destroy event on creation time (not enabling time) because if the
239 * event is found in the channel (to_create == 0), it means that at some
240 * point the enable_event worked and it's thus valid to keep it alive.
241 * Destroying it also implies that we also destroy it's shadow copy to sync
242 * everyone up.
243 */
244 if (to_create) {
245 /* In this code path, the uevent was not added to the hash table */
246 trace_ust_destroy_event(uevent);
247 }
18eace3b 248 rcu_read_unlock();
49d21f93
MD
249 free(filter_expression);
250 free(filter);
251 free(exclusion);
2bdd86d4
MD
252 return ret;
253}
254
7f79d3a1
DG
255/*
256 * Disable UST tracepoint of a channel from a UST session.
257 */
7972aab2 258int event_ust_disable_tracepoint(struct ltt_ust_session *usess,
df4f5a87 259 struct ltt_ust_channel *uchan, const char *event_name)
2bdd86d4
MD
260{
261 int ret;
7f79d3a1 262 struct ltt_ust_event *uevent;
18eace3b
DG
263 struct lttng_ht_node_str *node;
264 struct lttng_ht_iter iter;
18eace3b 265 struct lttng_ht *ht;
2bdd86d4 266
0525e9ae
DG
267 assert(usess);
268 assert(uchan);
269 assert(event_name);
270
18eace3b
DG
271 ht = uchan->events;
272
18eace3b 273 rcu_read_lock();
025faf73
DG
274
275 /*
276 * We use a custom lookup since we need the iterator for the next_duplicate
277 * call in the do while loop below.
278 */
279 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed),
280 trace_ust_ht_match_event_by_name, event_name, &iter.iter);
18eace3b
DG
281 node = lttng_ht_iter_get_node_str(&iter);
282 if (node == NULL) {
283 DBG2("Trace UST event NOT found by name %s", event_name);
f73fabfd 284 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
7f79d3a1 285 goto error;
2bdd86d4 286 }
7f79d3a1 287
18eace3b
DG
288 do {
289 uevent = caa_container_of(node, struct ltt_ust_event, node);
025faf73
DG
290 assert(uevent);
291
18eace3b
DG
292 if (uevent->enabled == 0) {
293 /* It's already disabled so everything is OK */
a1dcaf0f 294 goto next;
7f79d3a1 295 }
88e3c2f5
JG
296 uevent->enabled = 0;
297 DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
298 uchan->name);
18eace3b 299
88e3c2f5
JG
300 if (!usess->active) {
301 goto next;
302 }
7972aab2
DG
303 ret = ust_app_disable_event_glb(usess, uchan, uevent);
304 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
305 ret = LTTNG_ERR_UST_DISABLE_FAIL;
18eace3b
DG
306 goto error;
307 }
a1dcaf0f 308next:
18eace3b
DG
309 /* Get next duplicate event by name. */
310 cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name,
311 event_name, &iter.iter);
312 node = lttng_ht_iter_get_node_str(&iter);
313 } while (node);
7f79d3a1 314
f73fabfd 315 ret = LTTNG_OK;
7f79d3a1 316
7f79d3a1 317error:
18eace3b 318 rcu_read_unlock();
7f79d3a1
DG
319 return ret;
320}
321
b1e7fe2d
JR
322/*
323 * Disable all UST tracepoints for a channel from a UST session.
324 */
325int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess,
326 struct ltt_ust_channel *uchan)
327{
3e81c0f2 328 int ret, i, size, error = 0;
b1e7fe2d
JR
329 struct lttng_ht_iter iter;
330 struct ltt_ust_event *uevent = NULL;
331 struct lttng_event *events = NULL;
332
333 assert(usess);
334 assert(uchan);
335
336 rcu_read_lock();
337
338 /* Disabling existing events */
339 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
340 node.node) {
341 if (uevent->enabled == 1) {
342 ret = event_ust_disable_tracepoint(usess, uchan,
343 uevent->attr.name);
344 if (ret < 0) {
3e81c0f2 345 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
346 continue;
347 }
348 }
349 }
350
351 /* Get all UST available events */
352 size = ust_app_list_events(&events);
353 if (size < 0) {
354 ret = LTTNG_ERR_UST_LIST_FAIL;
355 goto error;
356 }
357
358 for (i = 0; i < size; i++) {
359 ret = event_ust_disable_tracepoint(usess, uchan,
360 events[i].name);
3e81c0f2 361 if (ret < 0) {
b1e7fe2d 362 /* Continue to disable the rest... */
3e81c0f2 363 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
364 continue;
365 }
366 }
367
3e81c0f2 368 ret = error ? error : LTTNG_OK;
b1e7fe2d
JR
369error:
370 rcu_read_unlock();
371 free(events);
372 return ret;
373}
374
44760c20
JR
375static void agent_enable_all(struct agent *agt)
376{
377 struct agent_event *aevent;
378 struct lttng_ht_iter iter;
379
380 /* Flag every event as enabled. */
381 rcu_read_lock();
382 cds_lfht_for_each_entry (
383 agt->events->ht, &iter.iter, aevent, node.node) {
384 aevent->enabled_count++;
385 }
386 rcu_read_unlock();
387}
388
f20baf8e 389/*
022d91ba 390 * Enable all agent event for a given UST session.
f20baf8e
DG
391 *
392 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
393 */
022d91ba 394int event_agent_enable_all(struct ltt_ust_session *usess,
fefd409b 395 struct agent *agt, struct lttng_event *event,
2b00d462 396 struct lttng_bytecode *filter ,char *filter_expression)
f20baf8e
DG
397{
398 int ret;
f20baf8e
DG
399
400 assert(usess);
401
022d91ba 402 DBG("Event agent enabling ALL events for session %" PRIu64, usess->id);
f20baf8e 403
022d91ba 404 /* Enable event on agent application through TCP socket. */
8404118c 405 ret = event_agent_enable(usess, agt, event, filter, filter_expression);
f20baf8e
DG
406 if (ret != LTTNG_OK) {
407 goto error;
408 }
409
44760c20 410 agent_enable_all(agt);
f20baf8e
DG
411
412 ret = LTTNG_OK;
413
414error:
415 return ret;
416}
417
71a559f8
JG
418/*
419 * Check if this event's filter requires the activation of application contexts
420 * and enable them in the agent.
b4bc01f7
MD
421 * TODO: bytecode iterator does not support non-legacy application
422 * contexts yet. Not an issue for now, since they are not generated by
423 * the lttng-ctl library.
71a559f8 424 */
2b00d462 425static int add_filter_app_ctx(struct lttng_bytecode *bytecode,
71a559f8
JG
426 const char *filter_expression, struct agent *agt)
427{
428 int ret = LTTNG_OK;
429 char *provider_name = NULL, *ctx_name = NULL;
430 struct bytecode_symbol_iterator *it =
431 bytecode_symbol_iterator_create(bytecode);
432
433 if (!it) {
434 ret = LTTNG_ERR_NOMEM;
435 goto end;
436 }
437
438 do {
439 struct lttng_event_context ctx;
440 const char *symbol_name =
441 bytecode_symbol_iterator_get_name(it);
442
443 if (parse_application_context(symbol_name, &provider_name,
444 &ctx_name)) {
445 /* Not an application context. */
446 continue;
447 }
448
449 ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT;
450 ctx.u.app_ctx.provider_name = provider_name;
451 ctx.u.app_ctx.ctx_name = ctx_name;
452
453 /* Recognized an application context. */
454 DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.",
455 filter_expression, provider_name, ctx_name);
456
457 ret = agent_add_context(&ctx, agt);
458 if (ret != LTTNG_OK) {
459 ERR("Failed to add application context %s:%s.",
460 provider_name, ctx_name);
461 goto end;
462 }
463
464 ret = agent_enable_context(&ctx, agt->domain);
465 if (ret != LTTNG_OK) {
466 ERR("Failed to enable application context %s:%s.",
467 provider_name, ctx_name);
468 goto end;
469 }
470
471 free(provider_name);
472 free(ctx_name);
473 provider_name = ctx_name = NULL;
474 } while (bytecode_symbol_iterator_next(it) == 0);
475end:
476 free(provider_name);
477 free(ctx_name);
478 bytecode_symbol_iterator_destroy(it);
479 return ret;
480}
481
44760c20
JR
482static int agent_enable(struct agent *agt,
483 struct lttng_event *event,
2b00d462 484 struct lttng_bytecode *filter,
8404118c 485 char *filter_expression)
f20baf8e
DG
486{
487 int ret, created = 0;
fefd409b 488 struct agent_event *aevent;
f20baf8e 489
f20baf8e 490 assert(event);
fefd409b 491 assert(agt);
f20baf8e 492
a9319624 493 aevent = agent_find_event(event->name, event->loglevel_type,
71a559f8 494 event->loglevel, filter_expression, agt);
fefd409b 495 if (!aevent) {
a9319624
PP
496 aevent = agent_create_event(event->name, event->loglevel_type,
497 event->loglevel, filter,
51755dc8 498 filter_expression);
fefd409b 499 if (!aevent) {
f20baf8e
DG
500 ret = LTTNG_ERR_NOMEM;
501 goto error;
502 }
b0a23296
JG
503 filter = NULL;
504 filter_expression = NULL;
f20baf8e 505 created = 1;
44760c20 506 assert(!AGENT_EVENT_IS_ENABLED(aevent));
f20baf8e
DG
507 }
508
bf7886d8
JR
509 if (created && aevent->filter) {
510 ret = add_filter_app_ctx(
511 aevent->filter, aevent->filter_expression, agt);
71a559f8
JG
512 if (ret != LTTNG_OK) {
513 goto error;
514 }
515 }
516
88e3c2f5 517 /* Already enabled? */
44760c20 518 if (AGENT_EVENT_IS_ENABLED(aevent)) {
88e3c2f5
JG
519 ret = LTTNG_OK;
520 goto end;
521 }
522
fefd409b 523 ret = agent_enable_event(aevent, agt->domain);
f20baf8e
DG
524 if (ret != LTTNG_OK) {
525 goto error;
526 }
527
528 /* If the event was created prior to the enable, add it to the domain. */
529 if (created) {
fefd409b 530 agent_add_event(aevent, agt);
f20baf8e
DG
531 }
532
b0a23296
JG
533 ret = LTTNG_OK;
534 goto end;
f20baf8e
DG
535
536error:
537 if (created) {
fefd409b 538 agent_destroy_event(aevent);
f20baf8e 539 }
b0a23296
JG
540end:
541 free(filter);
542 free(filter_expression);
f20baf8e
DG
543 return ret;
544}
545
44760c20
JR
546/*
547 * Enable a single agent event for a given UST session.
548 *
549 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
550 */
551int event_agent_enable(struct ltt_ust_session *usess,
552 struct agent *agt,
553 struct lttng_event *event,
2b00d462 554 struct lttng_bytecode *filter,
44760c20
JR
555 char *filter_expression)
556{
557 assert(usess);
558 assert(event);
559 assert(agt);
560
561 DBG("Enabling agent event: event pattern = '%s', session id = %" PRIu64 ", loglevel type = %d, loglevel = %d, filter expression = '%s'",
562 event->name, usess->id, event->loglevel_type,
563 event->loglevel,
564 filter_expression ? filter_expression : "(none)");
565
566 return agent_enable(agt, event, filter, filter_expression);
567}
568
569/*
570 * Enable a single agent event for a trigger.
571 *
572 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
573 */
574int trigger_agent_enable(const struct lttng_trigger *trigger, struct agent *agt)
575{
576 int ret;
577 enum lttng_condition_status c_status;
578 enum lttng_trigger_status t_status;
579 enum lttng_domain_type d_type;
580 const struct lttng_condition *condition;
581 const struct lttng_event_rule *rule;
582 const char *filter_expression;
583 char *filter_expression_copy = NULL;
2b00d462
SM
584 const struct lttng_bytecode *filter_bytecode;
585 struct lttng_bytecode *filter_bytecode_copy = NULL;
44760c20
JR
586 struct lttng_event *event = NULL;
587 uid_t trigger_owner_uid = 0;
588 const char *trigger_name;
589
590 assert(trigger);
591 assert(agt);
592
593 t_status = lttng_trigger_get_name(trigger, &trigger_name);
594 if (t_status != LTTNG_TRIGGER_STATUS_OK) {
595 trigger_name = "(unnamed)";
596 }
597
598 t_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner_uid);
599 assert(t_status == LTTNG_TRIGGER_STATUS_OK);
600
601 condition = lttng_trigger_get_const_condition(trigger);
602
603 assert(lttng_condition_get_type(condition) ==
d602bd6a 604 LTTNG_CONDITION_TYPE_ON_EVENT);
44760c20 605
d602bd6a 606 c_status = lttng_condition_on_event_get_rule(condition, &rule);
44760c20
JR
607 assert(c_status == LTTNG_CONDITION_STATUS_OK);
608
609 assert(lttng_event_rule_get_type(rule) ==
610 LTTNG_EVENT_RULE_TYPE_TRACEPOINT);
611
612 d_type = lttng_event_rule_get_domain_type(rule);
613 assert(d_type == agt->domain);
614
615 event = lttng_event_rule_generate_lttng_event(rule);
616 if (!event) {
617 ret = LTTNG_ERR_NOMEM;
618 goto end;
619 }
620
621 /* Get the internal filter expression and bytecode. */
622 filter_expression = lttng_event_rule_get_filter(rule);
623 if (filter_expression) {
624 filter_expression_copy = strdup(filter_expression);
625 if (!filter_expression_copy) {
626 ret = LTTNG_ERR_NOMEM;
627 goto end;
628 }
629
630 /* Get the filter bytecode */
631 filter_bytecode = lttng_event_rule_get_filter_bytecode(rule);
632 if (filter_bytecode) {
633 filter_bytecode_copy =
2b00d462 634 lttng_bytecode_copy(filter_bytecode);
44760c20
JR
635 if (!filter_bytecode_copy) {
636 ret = LTTNG_ERR_NOMEM;
637 goto end;
638 }
639 }
640 }
641
642 DBG("Enabling agent event from trigger: trigger name = '%s', trigger owner uid = %d, token = %" PRIu64,
643 trigger_name, trigger_owner_uid,
644 lttng_trigger_get_tracer_token(trigger));
645
646 ret = agent_enable(agt, event, filter_bytecode_copy,
647 filter_expression_copy);
648 /* Ownership was passed even in case of error. */
649 filter_expression_copy = NULL;
650 filter_bytecode_copy = NULL;
651
652end:
653 free(filter_expression_copy);
654 free(filter_bytecode_copy);
655 free(event);
656 return ret;
657}
658
da6c3a50 659/*
d1ec8e20
JG
660 * Return the default event name associated with the provided UST domain. Return
661 * NULL on error.
da6c3a50
DG
662 */
663const char *event_get_default_agent_ust_name(enum lttng_domain_type domain)
664{
665 const char *default_event_name = NULL;
666
0e115563
DG
667 switch (domain) {
668 case LTTNG_DOMAIN_LOG4J:
d1ec8e20 669 default_event_name = DEFAULT_LOG4J_EVENT_NAME;
0e115563
DG
670 break;
671 case LTTNG_DOMAIN_JUL:
d1ec8e20 672 default_event_name = DEFAULT_JUL_EVENT_NAME;
0e115563
DG
673 break;
674 case LTTNG_DOMAIN_PYTHON:
e7c82272 675 default_event_name = DEFAULT_PYTHON_EVENT_NAME;
0e115563
DG
676 break;
677 default:
da6c3a50
DG
678 assert(0);
679 }
680
681 return default_event_name;
682}
683
44760c20
JR
684static int trigger_agent_disable_one(const struct lttng_trigger *trigger,
685 struct agent *agt,
686 struct agent_event *aevent)
687
688{
689 int ret;
690
691 assert(agt);
692 assert(trigger);
693 assert(aevent);
694
695 /*
696 * Actual ust event un-registration happens on the trigger
697 * un-registration at that point.
698 */
699
700 DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for trigger %" PRIu64,
701 aevent->name, aevent->loglevel_type,
702 aevent->loglevel_value, lttng_trigger_get_tracer_token(trigger));
703
704 /* Already disabled? */
705 if (!AGENT_EVENT_IS_ENABLED(aevent)) {
706 goto end;
707 }
708
709 ret = agent_disable_event(aevent, agt->domain);
710 if (ret != LTTNG_OK) {
711 goto error;
712 }
713
714end:
715 return LTTNG_OK;
716
717error:
718 return ret;
719}
720
f20baf8e 721/*
e261a6cc 722 * Disable a given agent event for a given UST session.
f20baf8e 723 *
e261a6cc 724 * Must be called with the RCU read lock held.
f20baf8e
DG
725 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
726 */
e261a6cc
PP
727static int event_agent_disable_one(struct ltt_ust_session *usess,
728 struct agent *agt, struct agent_event *aevent)
f20baf8e
DG
729{
730 int ret;
be6a6276
DG
731 struct ltt_ust_event *uevent = NULL;
732 struct ltt_ust_channel *uchan = NULL;
71aecbf8 733 const char *ust_event_name, *ust_channel_name;
f20baf8e 734
fefd409b 735 assert(agt);
f20baf8e 736 assert(usess);
e261a6cc 737 assert(aevent);
f20baf8e 738
e261a6cc
PP
739 DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64,
740 aevent->name, aevent->loglevel_type, aevent->loglevel_value,
741 usess->id);
f20baf8e
DG
742
743 /* Already disabled? */
44760c20 744 if (!AGENT_EVENT_IS_ENABLED(aevent)) {
f20baf8e
DG
745 goto end;
746 }
747
71aecbf8
DG
748 if (agt->domain == LTTNG_DOMAIN_JUL) {
749 ust_channel_name = DEFAULT_JUL_CHANNEL_NAME;
750 } else if (agt->domain == LTTNG_DOMAIN_LOG4J) {
751 ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
752 } else if (agt->domain == LTTNG_DOMAIN_PYTHON) {
753 ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME;
71aecbf8
DG
754 } else {
755 ret = LTTNG_ERR_INVALID;
756 goto error;
757 }
758
be6a6276
DG
759 /*
760 * Disable it on the UST side. First get the channel reference then find
761 * the event and finally disable it.
762 */
763 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
71aecbf8 764 (char *) ust_channel_name);
be6a6276
DG
765 if (!uchan) {
766 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
767 goto error;
768 }
769
da6c3a50
DG
770 ust_event_name = event_get_default_agent_ust_name(agt->domain);
771 if (!ust_event_name) {
772 ret = LTTNG_ERR_FATAL;
773 goto error;
be6a6276
DG
774 }
775
776 /*
b953b8cd
PP
777 * Agent UST event has its loglevel type forced to
778 * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering
779 * happens thanks to an UST filter. The following -1 is actually
780 * ignored since the type is LTTNG_UST_LOGLEVEL_ALL.
be6a6276 781 */
da6c3a50 782 uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name,
fc4b93fa 783 aevent->filter, LTTNG_UST_ABI_LOGLEVEL_ALL, -1, NULL);
022d91ba 784 /* If the agent event exists, it must be available on the UST side. */
be6a6276
DG
785 assert(uevent);
786
88e3c2f5
JG
787 if (usess->active) {
788 ret = ust_app_disable_event_glb(usess, uchan, uevent);
789 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
790 ret = LTTNG_ERR_UST_DISABLE_FAIL;
791 goto error;
792 }
be6a6276
DG
793 }
794
0dcfcf94
DG
795 /*
796 * Flag event that it's disabled so the shadow copy on the ust app side
797 * will disable it if an application shows up.
798 */
799 uevent->enabled = 0;
800
fefd409b 801 ret = agent_disable_event(aevent, agt->domain);
f20baf8e
DG
802 if (ret != LTTNG_OK) {
803 goto error;
804 }
805
806end:
807 return LTTNG_OK;
808
809error:
810 return ret;
811}
e261a6cc 812
44760c20
JR
813/*
814 * Disable agent event matching a given trigger.
815 *
816 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
817 */
818int trigger_agent_disable(
819 const struct lttng_trigger *trigger, struct agent *agt)
820{
821 int ret = LTTNG_OK;
822 struct agent_event *aevent;
823
824 assert(trigger);
825 assert(agt);
826
827 DBG("Event agent disabling for trigger %" PRIu64,
828 lttng_trigger_get_tracer_token(trigger));
829
830 rcu_read_lock();
831 aevent = agent_find_event_by_trigger(trigger, agt);
832
833 if (aevent == NULL) {
834 DBG2("Event agent NOT found by trigger %" PRIu64,
835 lttng_trigger_get_tracer_token(trigger));
836 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
837 goto end;
838 }
839
840 ret = trigger_agent_disable_one(trigger, agt, aevent);
841
842 if (ret != LTTNG_OK) {
843 goto end;
844 }
845
846end:
847 rcu_read_unlock();
848 return ret;
849}
850
e261a6cc
PP
851/*
852 * Disable all agent events matching a given name for a given UST session.
853 *
854 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
855 */
856int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt,
df4f5a87 857 const char *event_name)
e261a6cc
PP
858{
859 int ret = LTTNG_OK;
860 struct agent_event *aevent;
861 struct lttng_ht_iter iter;
862 struct lttng_ht_node_str *node;
863
864 assert(agt);
865 assert(usess);
866 assert(event_name);
867
868 DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id);
869
870 rcu_read_lock();
871 agent_find_events_by_name(event_name, agt, &iter);
872 node = lttng_ht_iter_get_node_str(&iter);
873
874 if (node == NULL) {
875 DBG2("Event agent NOT found by name %s", event_name);
876 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
877 goto end;
878 }
879
880 do {
881 aevent = caa_container_of(node, struct agent_event, node);
882 ret = event_agent_disable_one(usess, agt, aevent);
883
884 if (ret != LTTNG_OK) {
885 goto end;
886 }
887
888 /* Get next duplicate agent event by name. */
889 agent_event_next_duplicate(event_name, agt, &iter);
890 node = lttng_ht_iter_get_node_str(&iter);
891 } while (node);
892end:
893 rcu_read_unlock();
894 return ret;
895}
f20baf8e 896/*
022d91ba 897 * Disable all agent event for a given UST session.
f20baf8e
DG
898 *
899 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
900 */
fefd409b
DG
901int event_agent_disable_all(struct ltt_ust_session *usess,
902 struct agent *agt)
f20baf8e 903{
0dcfcf94 904 int ret;
fefd409b 905 struct agent_event *aevent;
f20baf8e
DG
906 struct lttng_ht_iter iter;
907
fefd409b 908 assert(agt);
f20baf8e
DG
909 assert(usess);
910
0dcfcf94
DG
911 /*
912 * Disable event on agent application. Continue to disable all other events
913 * if the * event is not found.
914 */
fefd409b 915 ret = event_agent_disable(usess, agt, "*");
0dcfcf94
DG
916 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) {
917 goto error;
f20baf8e
DG
918 }
919
b9866e08 920 /* Disable every event. */
f20baf8e 921 rcu_read_lock();
fefd409b 922 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
f20baf8e 923 node.node) {
44760c20 924 if (!AGENT_EVENT_IS_ENABLED(aevent)) {
0dcfcf94
DG
925 continue;
926 }
927
928 ret = event_agent_disable(usess, agt, aevent->name);
929 if (ret != LTTNG_OK) {
b9866e08 930 goto error_unlock;
f20baf8e 931 }
f20baf8e 932 }
f20baf8e
DG
933 ret = LTTNG_OK;
934
b9866e08
JG
935error_unlock:
936 rcu_read_unlock();
f20baf8e
DG
937error:
938 return ret;
939}
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