clang-tidy: add a subset of cppcoreguidelines and other style checks
[lttng-tools.git] / src / bin / lttng-sessiond / event.cpp
CommitLineData
54d01ffb 1/*
21cf9b6b 2 * Copyright (C) 2011 EfficiOS Inc.
ab5be9fa 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
28ab034a 10#include "agent.hpp"
c9e313bc
SM
11#include "channel.hpp"
12#include "event.hpp"
13#include "kernel.hpp"
14#include "lttng-sessiond.hpp"
15#include "lttng-ust-ctl.hpp"
16#include "lttng-ust-error.hpp"
c9e313bc
SM
17#include "trace-kernel.hpp"
18#include "trace-ust.hpp"
28ab034a 19#include "ust-app.hpp"
c9e313bc 20#include "utils.hpp"
54d01ffb 21
28ab034a
JG
22#include <common/bytecode/bytecode.hpp>
23#include <common/compat/errno.hpp>
24#include <common/context.hpp>
25#include <common/error.hpp>
26#include <common/filter.hpp>
27#include <common/sessiond-comm/sessiond-comm.hpp>
28
29#include <lttng/condition/condition.h>
30#include <lttng/condition/event-rule-matches.h>
31#include <lttng/event-rule/event-rule-internal.hpp>
32#include <lttng/event-rule/event-rule.h>
33#include <lttng/lttng.h>
34
35#include <string.h>
36#include <urcu/list.h>
37
025faf73
DG
38/*
39 * Add unique UST event based on the event name, filter bytecode and loglevel.
40 */
28ab034a 41static void add_unique_ust_event(struct lttng_ht *ht, struct ltt_ust_event *event)
18eace3b
DG
42{
43 struct cds_lfht_node *node_ptr;
44 struct ltt_ust_ht_key key;
45
a0377dfe
FD
46 LTTNG_ASSERT(ht);
47 LTTNG_ASSERT(ht->ht);
48 LTTNG_ASSERT(event);
18eace3b
DG
49
50 key.name = event->attr.name;
2b00d462 51 key.filter = (struct lttng_bytecode *) event->filter;
7966af57 52 key.loglevel_type = (lttng_ust_abi_loglevel_type) event->attr.loglevel_type;
b953b8cd 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,
28ab034a
JG
57 ht->hash_fct(event->node.key, lttng_ht_seed),
58 trace_ust_ht_match_event,
59 &key,
60 &event->node.node);
a0377dfe 61 LTTNG_ASSERT(node_ptr == &event->node.node);
18eace3b
DG
62}
63
54d01ffb 64/*
9550ee81
JR
65 * Disable kernel tracepoint events for a channel from the kernel session of
66 * a specified event_name and event type.
67 * On type LTTNG_EVENT_ALL all events with event_name are disabled.
68 * If event_name is NULL all events of the specified type are disabled.
54d01ffb 69 */
d0ae4ea8 70int event_kernel_disable_event(struct ltt_kernel_channel *kchan,
28ab034a
JG
71 const char *event_name,
72 enum lttng_event_type type)
54d01ffb 73{
9550ee81 74 int ret, error = 0, found = 0;
54d01ffb
DG
75 struct ltt_kernel_event *kevent;
76
a0377dfe 77 LTTNG_ASSERT(kchan);
0525e9ae 78
54d01ffb 79 /* For each event in the kernel session */
28ab034a 80 cds_list_for_each_entry (kevent, &kchan->events_list.head, list) {
d0ae4ea8
MD
81 if (type != LTTNG_EVENT_ALL && kevent->type != type)
82 continue;
5c7248cd 83 if (event_name != nullptr && strcmp(event_name, kevent->event->name) != 0) {
9550ee81
JR
84 continue;
85 }
86 found++;
54d01ffb
DG
87 ret = kernel_disable_event(kevent);
88 if (ret < 0) {
9550ee81 89 error = 1;
54d01ffb
DG
90 continue;
91 }
92 }
9550ee81 93 DBG("Disable kernel event: found %d events with name: %s and type: %d",
28ab034a
JG
94 found,
95 event_name ? event_name : "NULL",
96 type);
7a3d1328 97
cd9adb8b 98 if (event_name != nullptr && !found) {
9550ee81
JR
99 ret = LTTNG_ERR_NO_EVENT;
100 } else {
101 ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK;
102 }
103
104 return ret;
54d01ffb
DG
105}
106
107/*
7a3d1328 108 * Enable kernel tracepoint event for a channel from the kernel session.
49d21f93 109 * We own filter_expression and filter.
54d01ffb 110 */
d0ae4ea8 111int event_kernel_enable_event(struct ltt_kernel_channel *kchan,
28ab034a
JG
112 struct lttng_event *event,
113 char *filter_expression,
114 struct lttng_bytecode *filter)
54d01ffb
DG
115{
116 int ret;
117 struct ltt_kernel_event *kevent;
118
a0377dfe
FD
119 LTTNG_ASSERT(kchan);
120 LTTNG_ASSERT(event);
0525e9ae 121
28ab034a 122 kevent = trace_kernel_find_event(event->name, kchan, event->type, filter);
cd9adb8b 123 if (kevent == nullptr) {
71a3bb01 124 ret = kernel_create_event(event, kchan, filter_expression, filter);
a969e101 125 /* We have passed ownership */
cd9adb8b
JG
126 filter_expression = nullptr;
127 filter = nullptr;
71a3bb01 128 if (ret) {
7a3d1328 129 goto end;
54d01ffb
DG
130 }
131 } else if (kevent->enabled == 0) {
132 ret = kernel_enable_event(kevent);
133 if (ret < 0) {
f73fabfd 134 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
7a3d1328 135 goto end;
54d01ffb 136 }
42224349
DG
137 } else {
138 /* At this point, the event is considered enabled */
f73fabfd 139 ret = LTTNG_ERR_KERN_EVENT_EXIST;
42224349 140 goto end;
54d01ffb 141 }
42224349 142
f73fabfd 143 ret = LTTNG_OK;
7a3d1328 144end:
a969e101
MD
145 free(filter_expression);
146 free(filter);
54d01ffb
DG
147 return ret;
148}
149
7f79d3a1
DG
150/*
151 * ============================
152 * UST : The Ultimate Frontier!
153 * ============================
154 */
155
2bdd86d4
MD
156/*
157 * Enable UST tracepoint event for a channel from a UST session.
49d21f93 158 * We own filter_expression, filter, and exclusion.
2bdd86d4 159 */
7972aab2 160int event_ust_enable_tracepoint(struct ltt_ust_session *usess,
28ab034a
JG
161 struct ltt_ust_channel *uchan,
162 struct lttng_event *event,
163 char *filter_expression,
164 struct lttng_bytecode *filter,
165 struct lttng_event_exclusion *exclusion,
166 bool internal_event)
2bdd86d4 167{
88e3c2f5 168 int ret = LTTNG_OK, to_create = 0;
edb67388
DG
169 struct ltt_ust_event *uevent;
170
a0377dfe
FD
171 LTTNG_ASSERT(usess);
172 LTTNG_ASSERT(uchan);
173 LTTNG_ASSERT(event);
0525e9ae 174
18eace3b
DG
175 rcu_read_lock();
176
28ab034a
JG
177 uevent = trace_ust_find_event(uchan->events,
178 event->name,
179 filter,
180 (enum lttng_ust_abi_loglevel_type) event->loglevel_type,
181 event->loglevel,
182 exclusion);
87c6e328 183 if (!uevent) {
28ab034a
JG
184 ret = trace_ust_create_event(
185 event, filter_expression, filter, exclusion, internal_event, &uevent);
49d21f93 186 /* We have passed ownership */
cd9adb8b
JG
187 filter_expression = nullptr;
188 filter = nullptr;
189 exclusion = nullptr;
39687410 190 if (ret != LTTNG_OK) {
3a243403 191 goto end;
edb67388 192 }
025faf73 193
fc34caaa 194 /* Valid to set it after the goto error since uevent is still NULL */
edb67388
DG
195 to_create = 1;
196 }
2bdd86d4 197
7f79d3a1
DG
198 if (uevent->enabled) {
199 /* It's already enabled so everything is OK */
a0377dfe 200 LTTNG_ASSERT(!to_create);
5bcdda4f 201 ret = LTTNG_ERR_UST_EVENT_ENABLED;
7f79d3a1
DG
202 goto end;
203 }
204
fc34caaa 205 uevent->enabled = 1;
88e3c2f5
JG
206 if (to_create) {
207 /* Add ltt ust event to channel */
208 add_unique_ust_event(uchan->events, uevent);
209 }
210
211 if (!usess->active) {
212 goto end;
213 }
fc34caaa 214
7972aab2
DG
215 if (to_create) {
216 /* Create event on all UST registered apps for session */
217 ret = ust_app_create_event_glb(usess, uchan, uevent);
218 } else {
219 /* Enable event on all UST registered apps for session */
220 ret = ust_app_enable_event_glb(usess, uchan, uevent);
221 }
48842b30 222
7972aab2
DG
223 if (ret < 0) {
224 if (ret == -LTTNG_UST_ERR_EXIST) {
225 ret = LTTNG_ERR_UST_EVENT_EXIST;
7972aab2
DG
226 } else {
227 ret = LTTNG_ERR_UST_ENABLE_FAIL;
edb67388 228 }
3a243403 229 goto end;
2bdd86d4 230 }
48842b30 231
28ab034a
JG
232 DBG("Event UST %s %s in channel %s",
233 uevent->attr.name,
234 to_create ? "created" : "enabled",
235 uchan->name);
7f79d3a1 236
f73fabfd 237 ret = LTTNG_OK;
fc34caaa 238
fb89d070 239end:
18eace3b 240 rcu_read_unlock();
49d21f93
MD
241 free(filter_expression);
242 free(filter);
243 free(exclusion);
fc34caaa 244 return ret;
2bdd86d4
MD
245}
246
7f79d3a1
DG
247/*
248 * Disable UST tracepoint of a channel from a UST session.
249 */
7972aab2 250int event_ust_disable_tracepoint(struct ltt_ust_session *usess,
28ab034a
JG
251 struct ltt_ust_channel *uchan,
252 const char *event_name)
2bdd86d4
MD
253{
254 int ret;
7f79d3a1 255 struct ltt_ust_event *uevent;
18eace3b
DG
256 struct lttng_ht_node_str *node;
257 struct lttng_ht_iter iter;
18eace3b 258 struct lttng_ht *ht;
2bdd86d4 259
a0377dfe
FD
260 LTTNG_ASSERT(usess);
261 LTTNG_ASSERT(uchan);
262 LTTNG_ASSERT(event_name);
0525e9ae 263
18eace3b
DG
264 ht = uchan->events;
265
18eace3b 266 rcu_read_lock();
025faf73
DG
267
268 /*
269 * We use a custom lookup since we need the iterator for the next_duplicate
270 * call in the do while loop below.
271 */
28ab034a
JG
272 cds_lfht_lookup(ht->ht,
273 ht->hash_fct((void *) event_name, lttng_ht_seed),
274 trace_ust_ht_match_event_by_name,
275 event_name,
276 &iter.iter);
18eace3b 277 node = lttng_ht_iter_get_node_str(&iter);
cd9adb8b 278 if (node == nullptr) {
18eace3b 279 DBG2("Trace UST event NOT found by name %s", event_name);
f73fabfd 280 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
7f79d3a1 281 goto error;
2bdd86d4 282 }
7f79d3a1 283
18eace3b 284 do {
0114db0e 285 uevent = lttng::utils::container_of(node, &ltt_ust_event::node);
a0377dfe 286 LTTNG_ASSERT(uevent);
025faf73 287
18eace3b
DG
288 if (uevent->enabled == 0) {
289 /* It's already disabled so everything is OK */
a1dcaf0f 290 goto next;
7f79d3a1 291 }
88e3c2f5 292 uevent->enabled = 0;
28ab034a 293 DBG2("Event UST %s disabled in channel %s", uevent->attr.name, uchan->name);
18eace3b 294
88e3c2f5
JG
295 if (!usess->active) {
296 goto next;
297 }
7972aab2
DG
298 ret = ust_app_disable_event_glb(usess, uchan, uevent);
299 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
300 ret = LTTNG_ERR_UST_DISABLE_FAIL;
18eace3b
DG
301 goto error;
302 }
28ab034a 303 next:
18eace3b 304 /* Get next duplicate event by name. */
28ab034a
JG
305 cds_lfht_next_duplicate(
306 ht->ht, trace_ust_ht_match_event_by_name, event_name, &iter.iter);
18eace3b
DG
307 node = lttng_ht_iter_get_node_str(&iter);
308 } while (node);
7f79d3a1 309
f73fabfd 310 ret = LTTNG_OK;
7f79d3a1 311
7f79d3a1 312error:
18eace3b 313 rcu_read_unlock();
7f79d3a1
DG
314 return ret;
315}
316
b1e7fe2d
JR
317/*
318 * Disable all UST tracepoints for a channel from a UST session.
319 */
28ab034a 320int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, struct ltt_ust_channel *uchan)
b1e7fe2d 321{
3e81c0f2 322 int ret, i, size, error = 0;
b1e7fe2d 323 struct lttng_ht_iter iter;
cd9adb8b
JG
324 struct ltt_ust_event *uevent = nullptr;
325 struct lttng_event *events = nullptr;
b1e7fe2d 326
a0377dfe
FD
327 LTTNG_ASSERT(usess);
328 LTTNG_ASSERT(uchan);
b1e7fe2d
JR
329
330 rcu_read_lock();
331
332 /* Disabling existing events */
28ab034a 333 cds_lfht_for_each_entry (uchan->events->ht, &iter.iter, uevent, node.node) {
b1e7fe2d 334 if (uevent->enabled == 1) {
28ab034a 335 ret = event_ust_disable_tracepoint(usess, uchan, uevent->attr.name);
b1e7fe2d 336 if (ret < 0) {
3e81c0f2 337 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
338 continue;
339 }
340 }
341 }
342
343 /* Get all UST available events */
344 size = ust_app_list_events(&events);
345 if (size < 0) {
346 ret = LTTNG_ERR_UST_LIST_FAIL;
347 goto error;
348 }
349
350 for (i = 0; i < size; i++) {
28ab034a 351 ret = event_ust_disable_tracepoint(usess, uchan, events[i].name);
3e81c0f2 352 if (ret < 0) {
b1e7fe2d 353 /* Continue to disable the rest... */
3e81c0f2 354 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
355 continue;
356 }
357 }
358
3e81c0f2 359 ret = error ? error : LTTNG_OK;
b1e7fe2d
JR
360error:
361 rcu_read_unlock();
362 free(events);
363 return ret;
364}
365
44760c20
JR
366static void agent_enable_all(struct agent *agt)
367{
368 struct agent_event *aevent;
369 struct lttng_ht_iter iter;
370
371 /* Flag every event as enabled. */
372 rcu_read_lock();
28ab034a 373 cds_lfht_for_each_entry (agt->events->ht, &iter.iter, aevent, node.node) {
44760c20
JR
374 aevent->enabled_count++;
375 }
376 rcu_read_unlock();
377}
378
f20baf8e 379/*
022d91ba 380 * Enable all agent event for a given UST session.
f20baf8e
DG
381 *
382 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
383 */
022d91ba 384int event_agent_enable_all(struct ltt_ust_session *usess,
28ab034a
JG
385 struct agent *agt,
386 struct lttng_event *event,
387 struct lttng_bytecode *filter,
388 char *filter_expression)
f20baf8e
DG
389{
390 int ret;
f20baf8e 391
a0377dfe 392 LTTNG_ASSERT(usess);
f20baf8e 393
022d91ba 394 DBG("Event agent enabling ALL events for session %" PRIu64, usess->id);
f20baf8e 395
022d91ba 396 /* Enable event on agent application through TCP socket. */
8404118c 397 ret = event_agent_enable(usess, agt, event, filter, filter_expression);
f20baf8e
DG
398 if (ret != LTTNG_OK) {
399 goto error;
400 }
401
44760c20 402 agent_enable_all(agt);
f20baf8e
DG
403
404 ret = LTTNG_OK;
405
406error:
407 return ret;
408}
409
71a559f8
JG
410/*
411 * Check if this event's filter requires the activation of application contexts
412 * and enable them in the agent.
b4bc01f7
MD
413 * TODO: bytecode iterator does not support non-legacy application
414 * contexts yet. Not an issue for now, since they are not generated by
415 * the lttng-ctl library.
71a559f8 416 */
2b00d462 417static int add_filter_app_ctx(struct lttng_bytecode *bytecode,
28ab034a
JG
418 const char *filter_expression,
419 struct agent *agt)
71a559f8
JG
420{
421 int ret = LTTNG_OK;
cd9adb8b 422 char *provider_name = nullptr, *ctx_name = nullptr;
28ab034a 423 struct bytecode_symbol_iterator *it = bytecode_symbol_iterator_create(bytecode);
71a559f8
JG
424
425 if (!it) {
426 ret = LTTNG_ERR_NOMEM;
427 goto end;
428 }
429
430 do {
431 struct lttng_event_context ctx;
28ab034a 432 const char *symbol_name = bytecode_symbol_iterator_get_name(it);
71a559f8 433
28ab034a 434 if (parse_application_context(symbol_name, &provider_name, &ctx_name)) {
71a559f8
JG
435 /* Not an application context. */
436 continue;
437 }
438
439 ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT;
440 ctx.u.app_ctx.provider_name = provider_name;
441 ctx.u.app_ctx.ctx_name = ctx_name;
442
443 /* Recognized an application context. */
444 DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.",
28ab034a
JG
445 filter_expression,
446 provider_name,
447 ctx_name);
71a559f8
JG
448
449 ret = agent_add_context(&ctx, agt);
450 if (ret != LTTNG_OK) {
28ab034a 451 ERR("Failed to add application context %s:%s.", provider_name, ctx_name);
71a559f8
JG
452 goto end;
453 }
454
455 ret = agent_enable_context(&ctx, agt->domain);
456 if (ret != LTTNG_OK) {
28ab034a 457 ERR("Failed to enable application context %s:%s.", provider_name, ctx_name);
71a559f8
JG
458 goto end;
459 }
460
461 free(provider_name);
462 free(ctx_name);
cd9adb8b 463 provider_name = ctx_name = nullptr;
71a559f8
JG
464 } while (bytecode_symbol_iterator_next(it) == 0);
465end:
466 free(provider_name);
467 free(ctx_name);
468 bytecode_symbol_iterator_destroy(it);
469 return ret;
470}
471
44760c20 472static int agent_enable(struct agent *agt,
28ab034a
JG
473 struct lttng_event *event,
474 struct lttng_bytecode *filter,
475 char *filter_expression)
f20baf8e
DG
476{
477 int ret, created = 0;
fefd409b 478 struct agent_event *aevent;
f20baf8e 479
a0377dfe
FD
480 LTTNG_ASSERT(event);
481 LTTNG_ASSERT(agt);
f20baf8e 482
c9753f72 483 rcu_read_lock();
28ab034a
JG
484 aevent = agent_find_event(
485 event->name, event->loglevel_type, event->loglevel, filter_expression, agt);
fefd409b 486 if (!aevent) {
28ab034a
JG
487 aevent = agent_create_event(event->name,
488 event->loglevel_type,
489 event->loglevel,
490 filter,
491 filter_expression);
fefd409b 492 if (!aevent) {
f20baf8e
DG
493 ret = LTTNG_ERR_NOMEM;
494 goto error;
495 }
cd9adb8b
JG
496 filter = nullptr;
497 filter_expression = nullptr;
f20baf8e 498 created = 1;
a0377dfe 499 LTTNG_ASSERT(!AGENT_EVENT_IS_ENABLED(aevent));
f20baf8e
DG
500 }
501
bf7886d8 502 if (created && aevent->filter) {
28ab034a 503 ret = add_filter_app_ctx(aevent->filter, aevent->filter_expression, agt);
71a559f8
JG
504 if (ret != LTTNG_OK) {
505 goto error;
506 }
507 }
508
88e3c2f5 509 /* Already enabled? */
44760c20 510 if (AGENT_EVENT_IS_ENABLED(aevent)) {
88e3c2f5
JG
511 ret = LTTNG_OK;
512 goto end;
513 }
514
fefd409b 515 ret = agent_enable_event(aevent, agt->domain);
f20baf8e
DG
516 if (ret != LTTNG_OK) {
517 goto error;
518 }
519
520 /* If the event was created prior to the enable, add it to the domain. */
521 if (created) {
fefd409b 522 agent_add_event(aevent, agt);
f20baf8e
DG
523 }
524
b0a23296
JG
525 ret = LTTNG_OK;
526 goto end;
f20baf8e
DG
527
528error:
529 if (created) {
fefd409b 530 agent_destroy_event(aevent);
f20baf8e 531 }
b0a23296 532end:
c9753f72 533 rcu_read_unlock();
b0a23296
JG
534 free(filter);
535 free(filter_expression);
f20baf8e
DG
536 return ret;
537}
538
44760c20
JR
539/*
540 * Enable a single agent event for a given UST session.
541 *
542 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
543 */
544int event_agent_enable(struct ltt_ust_session *usess,
28ab034a
JG
545 struct agent *agt,
546 struct lttng_event *event,
547 struct lttng_bytecode *filter,
548 char *filter_expression)
44760c20 549{
a0377dfe
FD
550 LTTNG_ASSERT(usess);
551 LTTNG_ASSERT(event);
552 LTTNG_ASSERT(agt);
44760c20 553
28ab034a
JG
554 DBG("Enabling agent event: event pattern = '%s', session id = %" PRIu64
555 ", loglevel type = %d, loglevel = %d, filter expression = '%s'",
556 event->name,
557 usess->id,
558 event->loglevel_type,
559 event->loglevel,
560 filter_expression ? filter_expression : "(none)");
44760c20
JR
561
562 return agent_enable(agt, event, filter, filter_expression);
563}
564
565/*
566 * Enable a single agent event for a trigger.
567 *
568 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
569 */
570int trigger_agent_enable(const struct lttng_trigger *trigger, struct agent *agt)
571{
572 int ret;
573 enum lttng_condition_status c_status;
574 enum lttng_trigger_status t_status;
575 enum lttng_domain_type d_type;
576 const struct lttng_condition *condition;
577 const struct lttng_event_rule *rule;
578 const char *filter_expression;
cd9adb8b 579 char *filter_expression_copy = nullptr;
2b00d462 580 const struct lttng_bytecode *filter_bytecode;
cd9adb8b
JG
581 struct lttng_bytecode *filter_bytecode_copy = nullptr;
582 struct lttng_event *event = nullptr;
44760c20
JR
583 uid_t trigger_owner_uid = 0;
584 const char *trigger_name;
585
a0377dfe
FD
586 LTTNG_ASSERT(trigger);
587 LTTNG_ASSERT(agt);
44760c20
JR
588
589 t_status = lttng_trigger_get_name(trigger, &trigger_name);
590 if (t_status != LTTNG_TRIGGER_STATUS_OK) {
0efb2ad7 591 trigger_name = "(anonymous)";
44760c20
JR
592 }
593
594 t_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner_uid);
a0377dfe 595 LTTNG_ASSERT(t_status == LTTNG_TRIGGER_STATUS_OK);
44760c20
JR
596
597 condition = lttng_trigger_get_const_condition(trigger);
598
a0377dfe 599 LTTNG_ASSERT(lttng_condition_get_type(condition) ==
28ab034a 600 LTTNG_CONDITION_TYPE_EVENT_RULE_MATCHES);
44760c20 601
28ab034a 602 c_status = lttng_condition_event_rule_matches_get_rule(condition, &rule);
a0377dfe 603 LTTNG_ASSERT(c_status == LTTNG_CONDITION_STATUS_OK);
44760c20 604
695f7044
JR
605 switch (lttng_event_rule_get_type(rule)) {
606 case LTTNG_EVENT_RULE_TYPE_JUL_LOGGING:
607 case LTTNG_EVENT_RULE_TYPE_LOG4J_LOGGING:
608 case LTTNG_EVENT_RULE_TYPE_PYTHON_LOGGING:
609 break;
610 default:
611 abort();
612 break;
613 }
44760c20
JR
614
615 d_type = lttng_event_rule_get_domain_type(rule);
a0377dfe 616 LTTNG_ASSERT(d_type == agt->domain);
44760c20
JR
617
618 event = lttng_event_rule_generate_lttng_event(rule);
619 if (!event) {
620 ret = LTTNG_ERR_NOMEM;
621 goto end;
622 }
623
624 /* Get the internal filter expression and bytecode. */
625 filter_expression = lttng_event_rule_get_filter(rule);
626 if (filter_expression) {
627 filter_expression_copy = strdup(filter_expression);
628 if (!filter_expression_copy) {
629 ret = LTTNG_ERR_NOMEM;
630 goto end;
631 }
632
633 /* Get the filter bytecode */
634 filter_bytecode = lttng_event_rule_get_filter_bytecode(rule);
635 if (filter_bytecode) {
28ab034a 636 filter_bytecode_copy = lttng_bytecode_copy(filter_bytecode);
44760c20
JR
637 if (!filter_bytecode_copy) {
638 ret = LTTNG_ERR_NOMEM;
639 goto end;
640 }
641 }
642 }
643
644 DBG("Enabling agent event from trigger: trigger name = '%s', trigger owner uid = %d, token = %" PRIu64,
28ab034a
JG
645 trigger_name,
646 trigger_owner_uid,
647 lttng_trigger_get_tracer_token(trigger));
44760c20 648
28ab034a 649 ret = agent_enable(agt, event, filter_bytecode_copy, filter_expression_copy);
44760c20 650 /* Ownership was passed even in case of error. */
cd9adb8b
JG
651 filter_expression_copy = nullptr;
652 filter_bytecode_copy = nullptr;
44760c20
JR
653
654end:
655 free(filter_expression_copy);
656 free(filter_bytecode_copy);
657 free(event);
658 return ret;
659}
660
da6c3a50 661/*
d1ec8e20
JG
662 * Return the default event name associated with the provided UST domain. Return
663 * NULL on error.
da6c3a50
DG
664 */
665const char *event_get_default_agent_ust_name(enum lttng_domain_type domain)
666{
cd9adb8b 667 const char *default_event_name = nullptr;
da6c3a50 668
0e115563
DG
669 switch (domain) {
670 case LTTNG_DOMAIN_LOG4J:
d1ec8e20 671 default_event_name = DEFAULT_LOG4J_EVENT_NAME;
0e115563
DG
672 break;
673 case LTTNG_DOMAIN_JUL:
d1ec8e20 674 default_event_name = DEFAULT_JUL_EVENT_NAME;
0e115563
DG
675 break;
676 case LTTNG_DOMAIN_PYTHON:
e7c82272 677 default_event_name = DEFAULT_PYTHON_EVENT_NAME;
0e115563
DG
678 break;
679 default:
a0377dfe 680 abort();
da6c3a50
DG
681 }
682
683 return default_event_name;
684}
685
44760c20 686static int trigger_agent_disable_one(const struct lttng_trigger *trigger,
28ab034a
JG
687 struct agent *agt,
688 struct agent_event *aevent)
44760c20
JR
689
690{
691 int ret;
692
a0377dfe
FD
693 LTTNG_ASSERT(agt);
694 LTTNG_ASSERT(trigger);
695 LTTNG_ASSERT(aevent);
44760c20
JR
696
697 /*
698 * Actual ust event un-registration happens on the trigger
699 * un-registration at that point.
700 */
701
702 DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for trigger %" PRIu64,
28ab034a
JG
703 aevent->name,
704 aevent->loglevel_type,
705 aevent->loglevel_value,
706 lttng_trigger_get_tracer_token(trigger));
44760c20
JR
707
708 /* Already disabled? */
709 if (!AGENT_EVENT_IS_ENABLED(aevent)) {
710 goto end;
711 }
712
713 ret = agent_disable_event(aevent, agt->domain);
714 if (ret != LTTNG_OK) {
715 goto error;
716 }
717
718end:
719 return LTTNG_OK;
720
721error:
722 return ret;
723}
724
f20baf8e 725/*
e261a6cc 726 * Disable a given agent event for a given UST session.
f20baf8e 727 *
e261a6cc 728 * Must be called with the RCU read lock held.
f20baf8e
DG
729 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
730 */
e261a6cc 731static int event_agent_disable_one(struct ltt_ust_session *usess,
28ab034a
JG
732 struct agent *agt,
733 struct agent_event *aevent)
f20baf8e
DG
734{
735 int ret;
cd9adb8b
JG
736 struct ltt_ust_event *uevent = nullptr;
737 struct ltt_ust_channel *uchan = nullptr;
71aecbf8 738 const char *ust_event_name, *ust_channel_name;
f20baf8e 739
a0377dfe
FD
740 LTTNG_ASSERT(agt);
741 LTTNG_ASSERT(usess);
742 LTTNG_ASSERT(aevent);
f20baf8e 743
e261a6cc 744 DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64,
28ab034a
JG
745 aevent->name,
746 aevent->loglevel_type,
747 aevent->loglevel_value,
748 usess->id);
f20baf8e
DG
749
750 /* Already disabled? */
44760c20 751 if (!AGENT_EVENT_IS_ENABLED(aevent)) {
f20baf8e
DG
752 goto end;
753 }
754
71aecbf8
DG
755 if (agt->domain == LTTNG_DOMAIN_JUL) {
756 ust_channel_name = DEFAULT_JUL_CHANNEL_NAME;
757 } else if (agt->domain == LTTNG_DOMAIN_LOG4J) {
758 ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
759 } else if (agt->domain == LTTNG_DOMAIN_PYTHON) {
760 ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME;
71aecbf8
DG
761 } else {
762 ret = LTTNG_ERR_INVALID;
763 goto error;
764 }
765
be6a6276
DG
766 /*
767 * Disable it on the UST side. First get the channel reference then find
768 * the event and finally disable it.
769 */
770 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
28ab034a 771 (char *) ust_channel_name);
be6a6276
DG
772 if (!uchan) {
773 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
774 goto error;
775 }
776
da6c3a50
DG
777 ust_event_name = event_get_default_agent_ust_name(agt->domain);
778 if (!ust_event_name) {
779 ret = LTTNG_ERR_FATAL;
780 goto error;
be6a6276
DG
781 }
782
783 /*
b953b8cd
PP
784 * Agent UST event has its loglevel type forced to
785 * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering
786 * happens thanks to an UST filter. The following -1 is actually
787 * ignored since the type is LTTNG_UST_LOGLEVEL_ALL.
be6a6276 788 */
28ab034a
JG
789 uevent = trace_ust_find_event(uchan->events,
790 (char *) ust_event_name,
791 aevent->filter,
792 LTTNG_UST_ABI_LOGLEVEL_ALL,
793 -1,
cd9adb8b 794 nullptr);
022d91ba 795 /* If the agent event exists, it must be available on the UST side. */
a0377dfe 796 LTTNG_ASSERT(uevent);
be6a6276 797
88e3c2f5
JG
798 if (usess->active) {
799 ret = ust_app_disable_event_glb(usess, uchan, uevent);
800 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
801 ret = LTTNG_ERR_UST_DISABLE_FAIL;
802 goto error;
803 }
be6a6276
DG
804 }
805
0dcfcf94
DG
806 /*
807 * Flag event that it's disabled so the shadow copy on the ust app side
808 * will disable it if an application shows up.
809 */
810 uevent->enabled = 0;
811
fefd409b 812 ret = agent_disable_event(aevent, agt->domain);
f20baf8e
DG
813 if (ret != LTTNG_OK) {
814 goto error;
815 }
816
817end:
818 return LTTNG_OK;
819
820error:
821 return ret;
822}
e261a6cc 823
44760c20
JR
824/*
825 * Disable agent event matching a given trigger.
826 *
827 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
828 */
28ab034a 829int trigger_agent_disable(const struct lttng_trigger *trigger, struct agent *agt)
44760c20
JR
830{
831 int ret = LTTNG_OK;
832 struct agent_event *aevent;
833
a0377dfe
FD
834 LTTNG_ASSERT(trigger);
835 LTTNG_ASSERT(agt);
44760c20 836
28ab034a 837 DBG("Event agent disabling for trigger %" PRIu64, lttng_trigger_get_tracer_token(trigger));
44760c20
JR
838
839 rcu_read_lock();
840 aevent = agent_find_event_by_trigger(trigger, agt);
841
cd9adb8b 842 if (aevent == nullptr) {
44760c20 843 DBG2("Event agent NOT found by trigger %" PRIu64,
28ab034a 844 lttng_trigger_get_tracer_token(trigger));
44760c20
JR
845 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
846 goto end;
847 }
848
849 ret = trigger_agent_disable_one(trigger, agt, aevent);
850
851 if (ret != LTTNG_OK) {
852 goto end;
853 }
854
855end:
856 rcu_read_unlock();
857 return ret;
858}
859
e261a6cc
PP
860/*
861 * Disable all agent events matching a given name for a given UST session.
862 *
863 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
864 */
28ab034a 865int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, const char *event_name)
e261a6cc
PP
866{
867 int ret = LTTNG_OK;
868 struct agent_event *aevent;
869 struct lttng_ht_iter iter;
870 struct lttng_ht_node_str *node;
871
a0377dfe
FD
872 LTTNG_ASSERT(agt);
873 LTTNG_ASSERT(usess);
874 LTTNG_ASSERT(event_name);
e261a6cc
PP
875
876 DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id);
877
878 rcu_read_lock();
879 agent_find_events_by_name(event_name, agt, &iter);
880 node = lttng_ht_iter_get_node_str(&iter);
881
cd9adb8b 882 if (node == nullptr) {
e261a6cc
PP
883 DBG2("Event agent NOT found by name %s", event_name);
884 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
885 goto end;
886 }
887
888 do {
0114db0e 889 aevent = lttng::utils::container_of(node, &agent_event::node);
e261a6cc
PP
890 ret = event_agent_disable_one(usess, agt, aevent);
891
892 if (ret != LTTNG_OK) {
893 goto end;
894 }
895
896 /* Get next duplicate agent event by name. */
897 agent_event_next_duplicate(event_name, agt, &iter);
898 node = lttng_ht_iter_get_node_str(&iter);
899 } while (node);
900end:
901 rcu_read_unlock();
902 return ret;
903}
f20baf8e 904/*
022d91ba 905 * Disable all agent event for a given UST session.
f20baf8e
DG
906 *
907 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
908 */
28ab034a 909int event_agent_disable_all(struct ltt_ust_session *usess, struct agent *agt)
f20baf8e 910{
0dcfcf94 911 int ret;
fefd409b 912 struct agent_event *aevent;
f20baf8e
DG
913 struct lttng_ht_iter iter;
914
a0377dfe
FD
915 LTTNG_ASSERT(agt);
916 LTTNG_ASSERT(usess);
f20baf8e 917
0dcfcf94
DG
918 /*
919 * Disable event on agent application. Continue to disable all other events
920 * if the * event is not found.
921 */
fefd409b 922 ret = event_agent_disable(usess, agt, "*");
0dcfcf94
DG
923 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) {
924 goto error;
f20baf8e
DG
925 }
926
b9866e08 927 /* Disable every event. */
f20baf8e 928 rcu_read_lock();
28ab034a 929 cds_lfht_for_each_entry (agt->events->ht, &iter.iter, aevent, node.node) {
44760c20 930 if (!AGENT_EVENT_IS_ENABLED(aevent)) {
0dcfcf94
DG
931 continue;
932 }
933
934 ret = event_agent_disable(usess, agt, aevent->name);
935 if (ret != LTTNG_OK) {
b9866e08 936 goto error_unlock;
f20baf8e 937 }
f20baf8e 938 }
f20baf8e
DG
939 ret = LTTNG_OK;
940
b9866e08
JG
941error_unlock:
942 rcu_read_unlock();
f20baf8e
DG
943error:
944 return ret;
945}
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