Fix: release reference to new chunk on copy error
[lttng-tools.git] / src / bin / lttng-sessiond / event.c
CommitLineData
54d01ffb
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
71a559f8 3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
54d01ffb 4 *
d14d33bf
AM
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
54d01ffb 8 *
d14d33bf
AM
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
54d01ffb 13 *
d14d33bf
AM
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
54d01ffb
DG
17 */
18
6c1c0768 19#define _LGPL_SOURCE
d87bfb32 20#include <errno.h>
54d01ffb 21#include <urcu/list.h>
2bdd86d4 22#include <string.h>
54d01ffb
DG
23
24#include <lttng/lttng.h>
db758600 25#include <common/error.h>
10a8a223 26#include <common/sessiond-comm/sessiond-comm.h>
71a559f8
JG
27#include <common/filter.h>
28#include <common/context.h>
54d01ffb
DG
29
30#include "channel.h"
31#include "event.h"
4771f025 32#include "kernel.h"
be6a6276 33#include "lttng-sessiond.h"
9df8df5e 34#include "ust-ctl.h"
edb67388
DG
35#include "ust-app.h"
36#include "trace-kernel.h"
37#include "trace-ust.h"
7c1d2758 38#include "agent.h"
54d01ffb 39
025faf73
DG
40/*
41 * Add unique UST event based on the event name, filter bytecode and loglevel.
42 */
18eace3b
DG
43static void add_unique_ust_event(struct lttng_ht *ht,
44 struct ltt_ust_event *event)
45{
46 struct cds_lfht_node *node_ptr;
47 struct ltt_ust_ht_key key;
48
49 assert(ht);
50 assert(ht->ht);
51 assert(event);
52
53 key.name = event->attr.name;
54 key.filter = (struct lttng_filter_bytecode *) event->filter;
b953b8cd
PP
55 key.loglevel_type = event->attr.loglevel_type;
56 key.loglevel_value = event->attr.loglevel;
4031e53e 57 key.exclusion = event->exclusion;
18eace3b
DG
58
59 node_ptr = cds_lfht_add_unique(ht->ht,
60 ht->hash_fct(event->node.key, lttng_ht_seed),
61 trace_ust_ht_match_event, &key, &event->node.node);
62 assert(node_ptr == &event->node.node);
63}
64
54d01ffb 65/*
9550ee81
JR
66 * Disable kernel tracepoint events for a channel from the kernel session of
67 * a specified event_name and event type.
68 * On type LTTNG_EVENT_ALL all events with event_name are disabled.
69 * If event_name is NULL all events of the specified type are disabled.
54d01ffb 70 */
d0ae4ea8 71int event_kernel_disable_event(struct ltt_kernel_channel *kchan,
df4f5a87 72 const char *event_name, enum lttng_event_type type)
54d01ffb 73{
9550ee81 74 int ret, error = 0, found = 0;
54d01ffb
DG
75 struct ltt_kernel_event *kevent;
76
0525e9ae
DG
77 assert(kchan);
78
54d01ffb
DG
79 /* For each event in the kernel session */
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;
9550ee81
JR
83 if (event_name != NULL && strcmp(event_name, kevent->event->name)) {
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
JR
93 DBG("Disable kernel event: found %d events with name: %s and type: %d",
94 found, event_name ? event_name : "NULL", type);
7a3d1328 95
9550ee81
JR
96 if (event_name != NULL && !found) {
97 ret = LTTNG_ERR_NO_EVENT;
98 } else {
99 ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK;
100 }
101
102 return ret;
54d01ffb
DG
103}
104
105/*
7a3d1328 106 * Enable kernel tracepoint event for a channel from the kernel session.
49d21f93 107 * We own filter_expression and filter.
54d01ffb 108 */
d0ae4ea8 109int event_kernel_enable_event(struct ltt_kernel_channel *kchan,
00a62084
MD
110 struct lttng_event *event, char *filter_expression,
111 struct lttng_filter_bytecode *filter)
54d01ffb
DG
112{
113 int ret;
114 struct ltt_kernel_event *kevent;
115
0525e9ae
DG
116 assert(kchan);
117 assert(event);
118
00a62084
MD
119 kevent = trace_kernel_find_event(event->name, kchan,
120 event->type, filter);
54d01ffb 121 if (kevent == NULL) {
71a3bb01 122 ret = kernel_create_event(event, kchan, filter_expression, filter);
a969e101
MD
123 /* We have passed ownership */
124 filter_expression = NULL;
125 filter = NULL;
71a3bb01 126 if (ret) {
7a3d1328 127 goto end;
54d01ffb
DG
128 }
129 } else if (kevent->enabled == 0) {
130 ret = kernel_enable_event(kevent);
131 if (ret < 0) {
f73fabfd 132 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
7a3d1328 133 goto end;
54d01ffb 134 }
42224349
DG
135 } else {
136 /* At this point, the event is considered enabled */
f73fabfd 137 ret = LTTNG_ERR_KERN_EVENT_EXIST;
42224349 138 goto end;
54d01ffb 139 }
42224349 140
f73fabfd 141 ret = LTTNG_OK;
7a3d1328 142end:
a969e101
MD
143 free(filter_expression);
144 free(filter);
54d01ffb
DG
145 return ret;
146}
147
7f79d3a1
DG
148/*
149 * ============================
150 * UST : The Ultimate Frontier!
151 * ============================
152 */
153
2bdd86d4
MD
154/*
155 * Enable UST tracepoint event for a channel from a UST session.
49d21f93 156 * We own filter_expression, filter, and exclusion.
2bdd86d4 157 */
7972aab2 158int event_ust_enable_tracepoint(struct ltt_ust_session *usess,
025faf73 159 struct ltt_ust_channel *uchan, struct lttng_event *event,
6b453b5e 160 char *filter_expression,
f1613f52 161 struct lttng_filter_bytecode *filter,
88f06f15
JG
162 struct lttng_event_exclusion *exclusion,
163 bool internal_event)
2bdd86d4 164{
88e3c2f5 165 int ret = LTTNG_OK, to_create = 0;
edb67388
DG
166 struct ltt_ust_event *uevent;
167
0525e9ae
DG
168 assert(usess);
169 assert(uchan);
170 assert(event);
171
18eace3b
DG
172 rcu_read_lock();
173
025faf73 174 uevent = trace_ust_find_event(uchan->events, event->name, filter,
abda88ad
JG
175 (enum lttng_ust_loglevel_type) event->loglevel_type,
176 event->loglevel, exclusion);
87c6e328 177 if (!uevent) {
39687410
FD
178 ret = trace_ust_create_event(event, filter_expression,
179 filter, exclusion, internal_event, &uevent);
49d21f93
MD
180 /* We have passed ownership */
181 filter_expression = NULL;
182 filter = NULL;
183 exclusion = NULL;
39687410 184 if (ret != LTTNG_OK) {
edb67388
DG
185 goto error;
186 }
025faf73 187
fc34caaa 188 /* Valid to set it after the goto error since uevent is still NULL */
edb67388
DG
189 to_create = 1;
190 }
2bdd86d4 191
7f79d3a1
DG
192 if (uevent->enabled) {
193 /* It's already enabled so everything is OK */
0359fdbc 194 assert(!to_create);
5bcdda4f 195 ret = LTTNG_ERR_UST_EVENT_ENABLED;
7f79d3a1
DG
196 goto end;
197 }
198
fc34caaa 199 uevent->enabled = 1;
88e3c2f5
JG
200 if (to_create) {
201 /* Add ltt ust event to channel */
202 add_unique_ust_event(uchan->events, uevent);
203 }
204
205 if (!usess->active) {
206 goto end;
207 }
fc34caaa 208
7972aab2
DG
209 if (to_create) {
210 /* Create event on all UST registered apps for session */
211 ret = ust_app_create_event_glb(usess, uchan, uevent);
212 } else {
213 /* Enable event on all UST registered apps for session */
214 ret = ust_app_enable_event_glb(usess, uchan, uevent);
215 }
48842b30 216
7972aab2
DG
217 if (ret < 0) {
218 if (ret == -LTTNG_UST_ERR_EXIST) {
219 ret = LTTNG_ERR_UST_EVENT_EXIST;
220 goto end;
221 } else {
222 ret = LTTNG_ERR_UST_ENABLE_FAIL;
223 goto error;
edb67388 224 }
2bdd86d4 225 }
48842b30 226
7f79d3a1
DG
227 DBG("Event UST %s %s in channel %s", uevent->attr.name,
228 to_create ? "created" : "enabled", uchan->name);
229
f73fabfd 230 ret = LTTNG_OK;
fc34caaa 231
fb89d070 232end:
18eace3b 233 rcu_read_unlock();
49d21f93
MD
234 free(filter_expression);
235 free(filter);
236 free(exclusion);
fc34caaa 237 return ret;
edb67388
DG
238
239error:
fc34caaa
DG
240 /*
241 * Only destroy event on creation time (not enabling time) because if the
242 * event is found in the channel (to_create == 0), it means that at some
243 * point the enable_event worked and it's thus valid to keep it alive.
244 * Destroying it also implies that we also destroy it's shadow copy to sync
245 * everyone up.
246 */
247 if (to_create) {
248 /* In this code path, the uevent was not added to the hash table */
249 trace_ust_destroy_event(uevent);
250 }
18eace3b 251 rcu_read_unlock();
49d21f93
MD
252 free(filter_expression);
253 free(filter);
254 free(exclusion);
2bdd86d4
MD
255 return ret;
256}
257
7f79d3a1
DG
258/*
259 * Disable UST tracepoint of a channel from a UST session.
260 */
7972aab2 261int event_ust_disable_tracepoint(struct ltt_ust_session *usess,
df4f5a87 262 struct ltt_ust_channel *uchan, const char *event_name)
2bdd86d4
MD
263{
264 int ret;
7f79d3a1 265 struct ltt_ust_event *uevent;
18eace3b
DG
266 struct lttng_ht_node_str *node;
267 struct lttng_ht_iter iter;
18eace3b 268 struct lttng_ht *ht;
2bdd86d4 269
0525e9ae
DG
270 assert(usess);
271 assert(uchan);
272 assert(event_name);
273
18eace3b
DG
274 ht = uchan->events;
275
18eace3b 276 rcu_read_lock();
025faf73
DG
277
278 /*
279 * We use a custom lookup since we need the iterator for the next_duplicate
280 * call in the do while loop below.
281 */
282 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed),
283 trace_ust_ht_match_event_by_name, event_name, &iter.iter);
18eace3b
DG
284 node = lttng_ht_iter_get_node_str(&iter);
285 if (node == NULL) {
286 DBG2("Trace UST event NOT found by name %s", event_name);
f73fabfd 287 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
7f79d3a1 288 goto error;
2bdd86d4 289 }
7f79d3a1 290
18eace3b
DG
291 do {
292 uevent = caa_container_of(node, struct ltt_ust_event, node);
025faf73
DG
293 assert(uevent);
294
18eace3b
DG
295 if (uevent->enabled == 0) {
296 /* It's already disabled so everything is OK */
a1dcaf0f 297 goto next;
7f79d3a1 298 }
88e3c2f5
JG
299 uevent->enabled = 0;
300 DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
301 uchan->name);
18eace3b 302
88e3c2f5
JG
303 if (!usess->active) {
304 goto next;
305 }
7972aab2
DG
306 ret = ust_app_disable_event_glb(usess, uchan, uevent);
307 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
308 ret = LTTNG_ERR_UST_DISABLE_FAIL;
18eace3b
DG
309 goto error;
310 }
a1dcaf0f 311next:
18eace3b
DG
312 /* Get next duplicate event by name. */
313 cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name,
314 event_name, &iter.iter);
315 node = lttng_ht_iter_get_node_str(&iter);
316 } while (node);
7f79d3a1 317
f73fabfd 318 ret = LTTNG_OK;
7f79d3a1 319
7f79d3a1 320error:
18eace3b 321 rcu_read_unlock();
7f79d3a1
DG
322 return ret;
323}
324
b1e7fe2d
JR
325/*
326 * Disable all UST tracepoints for a channel from a UST session.
327 */
328int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess,
329 struct ltt_ust_channel *uchan)
330{
3e81c0f2 331 int ret, i, size, error = 0;
b1e7fe2d
JR
332 struct lttng_ht_iter iter;
333 struct ltt_ust_event *uevent = NULL;
334 struct lttng_event *events = NULL;
335
336 assert(usess);
337 assert(uchan);
338
339 rcu_read_lock();
340
341 /* Disabling existing events */
342 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
343 node.node) {
344 if (uevent->enabled == 1) {
345 ret = event_ust_disable_tracepoint(usess, uchan,
346 uevent->attr.name);
347 if (ret < 0) {
3e81c0f2 348 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
349 continue;
350 }
351 }
352 }
353
354 /* Get all UST available events */
355 size = ust_app_list_events(&events);
356 if (size < 0) {
357 ret = LTTNG_ERR_UST_LIST_FAIL;
358 goto error;
359 }
360
361 for (i = 0; i < size; i++) {
362 ret = event_ust_disable_tracepoint(usess, uchan,
363 events[i].name);
3e81c0f2 364 if (ret < 0) {
b1e7fe2d 365 /* Continue to disable the rest... */
3e81c0f2 366 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
367 continue;
368 }
369 }
370
3e81c0f2 371 ret = error ? error : LTTNG_OK;
b1e7fe2d
JR
372error:
373 rcu_read_unlock();
374 free(events);
375 return ret;
376}
377
f20baf8e 378/*
022d91ba 379 * Enable all agent event for a given UST session.
f20baf8e
DG
380 *
381 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
382 */
022d91ba 383int event_agent_enable_all(struct ltt_ust_session *usess,
fefd409b 384 struct agent *agt, struct lttng_event *event,
51755dc8 385 struct lttng_filter_bytecode *filter ,char *filter_expression)
f20baf8e
DG
386{
387 int ret;
fefd409b 388 struct agent_event *aevent;
f20baf8e
DG
389 struct lttng_ht_iter iter;
390
391 assert(usess);
392
022d91ba 393 DBG("Event agent enabling ALL events for session %" PRIu64, usess->id);
f20baf8e 394
022d91ba 395 /* Enable event on agent application through TCP socket. */
8404118c 396 ret = event_agent_enable(usess, agt, event, filter, filter_expression);
f20baf8e
DG
397 if (ret != LTTNG_OK) {
398 goto error;
399 }
400
401 /* Flag every event that they are now enabled. */
402 rcu_read_lock();
fefd409b 403 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
f20baf8e 404 node.node) {
fefd409b 405 aevent->enabled = 1;
f20baf8e
DG
406 }
407 rcu_read_unlock();
408
409 ret = LTTNG_OK;
410
411error:
412 return ret;
413}
414
71a559f8
JG
415/*
416 * Check if this event's filter requires the activation of application contexts
417 * and enable them in the agent.
b4bc01f7
MD
418 * TODO: bytecode iterator does not support non-legacy application
419 * contexts yet. Not an issue for now, since they are not generated by
420 * the lttng-ctl library.
71a559f8
JG
421 */
422static int add_filter_app_ctx(struct lttng_filter_bytecode *bytecode,
423 const char *filter_expression, struct agent *agt)
424{
425 int ret = LTTNG_OK;
426 char *provider_name = NULL, *ctx_name = NULL;
427 struct bytecode_symbol_iterator *it =
428 bytecode_symbol_iterator_create(bytecode);
429
430 if (!it) {
431 ret = LTTNG_ERR_NOMEM;
432 goto end;
433 }
434
435 do {
436 struct lttng_event_context ctx;
437 const char *symbol_name =
438 bytecode_symbol_iterator_get_name(it);
439
440 if (parse_application_context(symbol_name, &provider_name,
441 &ctx_name)) {
442 /* Not an application context. */
443 continue;
444 }
445
446 ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT;
447 ctx.u.app_ctx.provider_name = provider_name;
448 ctx.u.app_ctx.ctx_name = ctx_name;
449
450 /* Recognized an application context. */
451 DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.",
452 filter_expression, provider_name, ctx_name);
453
454 ret = agent_add_context(&ctx, agt);
455 if (ret != LTTNG_OK) {
456 ERR("Failed to add application context %s:%s.",
457 provider_name, ctx_name);
458 goto end;
459 }
460
461 ret = agent_enable_context(&ctx, agt->domain);
462 if (ret != LTTNG_OK) {
463 ERR("Failed to enable application context %s:%s.",
464 provider_name, ctx_name);
465 goto end;
466 }
467
468 free(provider_name);
469 free(ctx_name);
470 provider_name = ctx_name = NULL;
471 } while (bytecode_symbol_iterator_next(it) == 0);
472end:
473 free(provider_name);
474 free(ctx_name);
475 bytecode_symbol_iterator_destroy(it);
476 return ret;
477}
478
f20baf8e 479/*
022d91ba 480 * Enable a single agent event for a given UST session.
f20baf8e
DG
481 *
482 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
483 */
fefd409b
DG
484int event_agent_enable(struct ltt_ust_session *usess,
485 struct agent *agt, struct lttng_event *event,
8404118c
JG
486 struct lttng_filter_bytecode *filter,
487 char *filter_expression)
f20baf8e
DG
488{
489 int ret, created = 0;
fefd409b 490 struct agent_event *aevent;
f20baf8e
DG
491
492 assert(usess);
493 assert(event);
fefd409b 494 assert(agt);
f20baf8e 495
022d91ba 496 DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d "
51755dc8
JG
497 ", loglevel %d and filter \"%s\"", event->name,
498 usess->id, event->loglevel_type, event->loglevel,
499 filter_expression ? filter_expression : "NULL");
f20baf8e 500
a9319624 501 aevent = agent_find_event(event->name, event->loglevel_type,
71a559f8 502 event->loglevel, filter_expression, agt);
fefd409b 503 if (!aevent) {
a9319624
PP
504 aevent = agent_create_event(event->name, event->loglevel_type,
505 event->loglevel, filter,
51755dc8 506 filter_expression);
fefd409b 507 if (!aevent) {
f20baf8e
DG
508 ret = LTTNG_ERR_NOMEM;
509 goto error;
510 }
b0a23296
JG
511 filter = NULL;
512 filter_expression = NULL;
f20baf8e
DG
513 created = 1;
514 }
515
71a559f8
JG
516 if (created && filter) {
517 ret = add_filter_app_ctx(filter, filter_expression, agt);
518 if (ret != LTTNG_OK) {
519 goto error;
520 }
521 }
522
88e3c2f5
JG
523 /* Already enabled? */
524 if (aevent->enabled) {
525 ret = LTTNG_OK;
526 goto end;
527 }
528
fefd409b 529 ret = agent_enable_event(aevent, agt->domain);
f20baf8e
DG
530 if (ret != LTTNG_OK) {
531 goto error;
532 }
533
534 /* If the event was created prior to the enable, add it to the domain. */
535 if (created) {
fefd409b 536 agent_add_event(aevent, agt);
f20baf8e
DG
537 }
538
b0a23296
JG
539 ret = LTTNG_OK;
540 goto end;
f20baf8e
DG
541
542error:
543 if (created) {
fefd409b 544 agent_destroy_event(aevent);
f20baf8e 545 }
b0a23296
JG
546end:
547 free(filter);
548 free(filter_expression);
f20baf8e
DG
549 return ret;
550}
551
da6c3a50 552/*
d1ec8e20
JG
553 * Return the default event name associated with the provided UST domain. Return
554 * NULL on error.
da6c3a50
DG
555 */
556const char *event_get_default_agent_ust_name(enum lttng_domain_type domain)
557{
558 const char *default_event_name = NULL;
559
0e115563
DG
560 switch (domain) {
561 case LTTNG_DOMAIN_LOG4J:
d1ec8e20 562 default_event_name = DEFAULT_LOG4J_EVENT_NAME;
0e115563
DG
563 break;
564 case LTTNG_DOMAIN_JUL:
d1ec8e20 565 default_event_name = DEFAULT_JUL_EVENT_NAME;
0e115563
DG
566 break;
567 case LTTNG_DOMAIN_PYTHON:
e7c82272 568 default_event_name = DEFAULT_PYTHON_EVENT_NAME;
0e115563
DG
569 break;
570 default:
da6c3a50
DG
571 assert(0);
572 }
573
574 return default_event_name;
575}
576
f20baf8e 577/*
e261a6cc 578 * Disable a given agent event for a given UST session.
f20baf8e 579 *
e261a6cc 580 * Must be called with the RCU read lock held.
f20baf8e
DG
581 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
582 */
e261a6cc
PP
583static int event_agent_disable_one(struct ltt_ust_session *usess,
584 struct agent *agt, struct agent_event *aevent)
f20baf8e
DG
585{
586 int ret;
be6a6276
DG
587 struct ltt_ust_event *uevent = NULL;
588 struct ltt_ust_channel *uchan = NULL;
71aecbf8 589 const char *ust_event_name, *ust_channel_name;
f20baf8e 590
fefd409b 591 assert(agt);
f20baf8e 592 assert(usess);
e261a6cc 593 assert(aevent);
f20baf8e 594
e261a6cc
PP
595 DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64,
596 aevent->name, aevent->loglevel_type, aevent->loglevel_value,
597 usess->id);
f20baf8e
DG
598
599 /* Already disabled? */
fefd409b 600 if (!aevent->enabled) {
f20baf8e
DG
601 goto end;
602 }
603
71aecbf8
DG
604 if (agt->domain == LTTNG_DOMAIN_JUL) {
605 ust_channel_name = DEFAULT_JUL_CHANNEL_NAME;
606 } else if (agt->domain == LTTNG_DOMAIN_LOG4J) {
607 ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
608 } else if (agt->domain == LTTNG_DOMAIN_PYTHON) {
609 ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME;
71aecbf8
DG
610 } else {
611 ret = LTTNG_ERR_INVALID;
612 goto error;
613 }
614
be6a6276
DG
615 /*
616 * Disable it on the UST side. First get the channel reference then find
617 * the event and finally disable it.
618 */
619 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
71aecbf8 620 (char *) ust_channel_name);
be6a6276
DG
621 if (!uchan) {
622 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
623 goto error;
624 }
625
da6c3a50
DG
626 ust_event_name = event_get_default_agent_ust_name(agt->domain);
627 if (!ust_event_name) {
628 ret = LTTNG_ERR_FATAL;
629 goto error;
be6a6276
DG
630 }
631
632 /*
b953b8cd
PP
633 * Agent UST event has its loglevel type forced to
634 * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering
635 * happens thanks to an UST filter. The following -1 is actually
636 * ignored since the type is LTTNG_UST_LOGLEVEL_ALL.
be6a6276 637 */
da6c3a50 638 uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name,
b953b8cd 639 aevent->filter, LTTNG_UST_LOGLEVEL_ALL, -1, NULL);
022d91ba 640 /* If the agent event exists, it must be available on the UST side. */
be6a6276
DG
641 assert(uevent);
642
88e3c2f5
JG
643 if (usess->active) {
644 ret = ust_app_disable_event_glb(usess, uchan, uevent);
645 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
646 ret = LTTNG_ERR_UST_DISABLE_FAIL;
647 goto error;
648 }
be6a6276
DG
649 }
650
0dcfcf94
DG
651 /*
652 * Flag event that it's disabled so the shadow copy on the ust app side
653 * will disable it if an application shows up.
654 */
655 uevent->enabled = 0;
656
fefd409b 657 ret = agent_disable_event(aevent, agt->domain);
f20baf8e
DG
658 if (ret != LTTNG_OK) {
659 goto error;
660 }
661
662end:
663 return LTTNG_OK;
664
665error:
666 return ret;
667}
e261a6cc
PP
668
669/*
670 * Disable all agent events matching a given name for a given UST session.
671 *
672 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
673 */
674int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt,
df4f5a87 675 const char *event_name)
e261a6cc
PP
676{
677 int ret = LTTNG_OK;
678 struct agent_event *aevent;
679 struct lttng_ht_iter iter;
680 struct lttng_ht_node_str *node;
681
682 assert(agt);
683 assert(usess);
684 assert(event_name);
685
686 DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id);
687
688 rcu_read_lock();
689 agent_find_events_by_name(event_name, agt, &iter);
690 node = lttng_ht_iter_get_node_str(&iter);
691
692 if (node == NULL) {
693 DBG2("Event agent NOT found by name %s", event_name);
694 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
695 goto end;
696 }
697
698 do {
699 aevent = caa_container_of(node, struct agent_event, node);
700 ret = event_agent_disable_one(usess, agt, aevent);
701
702 if (ret != LTTNG_OK) {
703 goto end;
704 }
705
706 /* Get next duplicate agent event by name. */
707 agent_event_next_duplicate(event_name, agt, &iter);
708 node = lttng_ht_iter_get_node_str(&iter);
709 } while (node);
710end:
711 rcu_read_unlock();
712 return ret;
713}
f20baf8e 714/*
022d91ba 715 * Disable all agent event for a given UST session.
f20baf8e
DG
716 *
717 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
718 */
fefd409b
DG
719int event_agent_disable_all(struct ltt_ust_session *usess,
720 struct agent *agt)
f20baf8e 721{
0dcfcf94 722 int ret;
fefd409b 723 struct agent_event *aevent;
f20baf8e
DG
724 struct lttng_ht_iter iter;
725
fefd409b 726 assert(agt);
f20baf8e
DG
727 assert(usess);
728
0dcfcf94
DG
729 /*
730 * Disable event on agent application. Continue to disable all other events
731 * if the * event is not found.
732 */
fefd409b 733 ret = event_agent_disable(usess, agt, "*");
0dcfcf94
DG
734 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) {
735 goto error;
f20baf8e
DG
736 }
737
b9866e08 738 /* Disable every event. */
f20baf8e 739 rcu_read_lock();
fefd409b 740 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
f20baf8e 741 node.node) {
0dcfcf94
DG
742 if (!aevent->enabled) {
743 continue;
744 }
745
746 ret = event_agent_disable(usess, agt, aevent->name);
747 if (ret != LTTNG_OK) {
b9866e08 748 goto error_unlock;
f20baf8e 749 }
f20baf8e 750 }
f20baf8e
DG
751 ret = LTTNG_OK;
752
b9866e08
JG
753error_unlock:
754 rcu_read_unlock();
f20baf8e
DG
755error:
756 return ret;
757}
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