Stop sessions before destroying on teardown of session daemon
[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,
9550ee81 72 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{
39687410 165 int ret, 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,
b953b8cd 175 event->loglevel_type, event->loglevel, exclusion);
87c6e328 176 if (!uevent) {
39687410
FD
177 ret = trace_ust_create_event(event, filter_expression,
178 filter, exclusion, internal_event, &uevent);
49d21f93
MD
179 /* We have passed ownership */
180 filter_expression = NULL;
181 filter = NULL;
182 exclusion = NULL;
39687410 183 if (ret != LTTNG_OK) {
edb67388
DG
184 goto error;
185 }
025faf73 186
fc34caaa 187 /* Valid to set it after the goto error since uevent is still NULL */
edb67388
DG
188 to_create = 1;
189 }
2bdd86d4 190
7f79d3a1
DG
191 if (uevent->enabled) {
192 /* It's already enabled so everything is OK */
5bcdda4f 193 ret = LTTNG_ERR_UST_EVENT_ENABLED;
7f79d3a1
DG
194 goto end;
195 }
196
fc34caaa
DG
197 uevent->enabled = 1;
198
7972aab2
DG
199 if (to_create) {
200 /* Create event on all UST registered apps for session */
201 ret = ust_app_create_event_glb(usess, uchan, uevent);
202 } else {
203 /* Enable event on all UST registered apps for session */
204 ret = ust_app_enable_event_glb(usess, uchan, uevent);
205 }
48842b30 206
7972aab2
DG
207 if (ret < 0) {
208 if (ret == -LTTNG_UST_ERR_EXIST) {
209 ret = LTTNG_ERR_UST_EVENT_EXIST;
210 goto end;
211 } else {
212 ret = LTTNG_ERR_UST_ENABLE_FAIL;
213 goto error;
edb67388 214 }
2bdd86d4 215 }
48842b30 216
7f79d3a1 217 if (to_create) {
fc34caaa 218 /* Add ltt ust event to channel */
18eace3b 219 add_unique_ust_event(uchan->events, uevent);
7f79d3a1 220 }
edb67388 221
7f79d3a1
DG
222 DBG("Event UST %s %s in channel %s", uevent->attr.name,
223 to_create ? "created" : "enabled", uchan->name);
224
f73fabfd 225 ret = LTTNG_OK;
fc34caaa 226
fb89d070 227end:
18eace3b 228 rcu_read_unlock();
49d21f93
MD
229 free(filter_expression);
230 free(filter);
231 free(exclusion);
fc34caaa 232 return ret;
edb67388
DG
233
234error:
fc34caaa
DG
235 /*
236 * Only destroy event on creation time (not enabling time) because if the
237 * event is found in the channel (to_create == 0), it means that at some
238 * point the enable_event worked and it's thus valid to keep it alive.
239 * Destroying it also implies that we also destroy it's shadow copy to sync
240 * everyone up.
241 */
242 if (to_create) {
243 /* In this code path, the uevent was not added to the hash table */
244 trace_ust_destroy_event(uevent);
245 }
18eace3b 246 rcu_read_unlock();
49d21f93
MD
247 free(filter_expression);
248 free(filter);
249 free(exclusion);
2bdd86d4
MD
250 return ret;
251}
252
7f79d3a1
DG
253/*
254 * Disable UST tracepoint of a channel from a UST session.
255 */
7972aab2 256int event_ust_disable_tracepoint(struct ltt_ust_session *usess,
7f79d3a1 257 struct ltt_ust_channel *uchan, char *event_name)
2bdd86d4
MD
258{
259 int ret;
7f79d3a1 260 struct ltt_ust_event *uevent;
18eace3b
DG
261 struct lttng_ht_node_str *node;
262 struct lttng_ht_iter iter;
18eace3b 263 struct lttng_ht *ht;
2bdd86d4 264
0525e9ae
DG
265 assert(usess);
266 assert(uchan);
267 assert(event_name);
268
18eace3b
DG
269 ht = uchan->events;
270
18eace3b 271 rcu_read_lock();
025faf73
DG
272
273 /*
274 * We use a custom lookup since we need the iterator for the next_duplicate
275 * call in the do while loop below.
276 */
277 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed),
278 trace_ust_ht_match_event_by_name, event_name, &iter.iter);
18eace3b
DG
279 node = lttng_ht_iter_get_node_str(&iter);
280 if (node == NULL) {
281 DBG2("Trace UST event NOT found by name %s", event_name);
f73fabfd 282 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
7f79d3a1 283 goto error;
2bdd86d4 284 }
7f79d3a1 285
18eace3b
DG
286 do {
287 uevent = caa_container_of(node, struct ltt_ust_event, node);
025faf73
DG
288 assert(uevent);
289
18eace3b
DG
290 if (uevent->enabled == 0) {
291 /* It's already disabled so everything is OK */
a1dcaf0f 292 goto next;
7f79d3a1 293 }
18eace3b 294
7972aab2
DG
295 ret = ust_app_disable_event_glb(usess, uchan, uevent);
296 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
297 ret = LTTNG_ERR_UST_DISABLE_FAIL;
18eace3b
DG
298 goto error;
299 }
18eace3b
DG
300 uevent->enabled = 0;
301
025faf73
DG
302 DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
303 uchan->name);
304
a1dcaf0f 305next:
18eace3b
DG
306 /* Get next duplicate event by name. */
307 cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name,
308 event_name, &iter.iter);
309 node = lttng_ht_iter_get_node_str(&iter);
310 } while (node);
7f79d3a1 311
f73fabfd 312 ret = LTTNG_OK;
7f79d3a1 313
7f79d3a1 314error:
18eace3b 315 rcu_read_unlock();
7f79d3a1
DG
316 return ret;
317}
318
b1e7fe2d
JR
319/*
320 * Disable all UST tracepoints for a channel from a UST session.
321 */
322int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess,
323 struct ltt_ust_channel *uchan)
324{
3e81c0f2 325 int ret, i, size, error = 0;
b1e7fe2d
JR
326 struct lttng_ht_iter iter;
327 struct ltt_ust_event *uevent = NULL;
328 struct lttng_event *events = NULL;
329
330 assert(usess);
331 assert(uchan);
332
333 rcu_read_lock();
334
335 /* Disabling existing events */
336 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
337 node.node) {
338 if (uevent->enabled == 1) {
339 ret = event_ust_disable_tracepoint(usess, uchan,
340 uevent->attr.name);
341 if (ret < 0) {
3e81c0f2 342 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
343 continue;
344 }
345 }
346 }
347
348 /* Get all UST available events */
349 size = ust_app_list_events(&events);
350 if (size < 0) {
351 ret = LTTNG_ERR_UST_LIST_FAIL;
352 goto error;
353 }
354
355 for (i = 0; i < size; i++) {
356 ret = event_ust_disable_tracepoint(usess, uchan,
357 events[i].name);
3e81c0f2 358 if (ret < 0) {
b1e7fe2d 359 /* Continue to disable the rest... */
3e81c0f2 360 error = LTTNG_ERR_UST_DISABLE_FAIL;
b1e7fe2d
JR
361 continue;
362 }
363 }
364
3e81c0f2 365 ret = error ? error : LTTNG_OK;
b1e7fe2d
JR
366error:
367 rcu_read_unlock();
368 free(events);
369 return ret;
370}
371
f20baf8e 372/*
022d91ba 373 * Enable all agent event for a given UST session.
f20baf8e
DG
374 *
375 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
376 */
022d91ba 377int event_agent_enable_all(struct ltt_ust_session *usess,
fefd409b 378 struct agent *agt, struct lttng_event *event,
51755dc8 379 struct lttng_filter_bytecode *filter ,char *filter_expression)
f20baf8e
DG
380{
381 int ret;
fefd409b 382 struct agent_event *aevent;
f20baf8e
DG
383 struct lttng_ht_iter iter;
384
385 assert(usess);
386
022d91ba 387 DBG("Event agent enabling ALL events for session %" PRIu64, usess->id);
f20baf8e 388
022d91ba 389 /* Enable event on agent application through TCP socket. */
8404118c 390 ret = event_agent_enable(usess, agt, event, filter, filter_expression);
f20baf8e
DG
391 if (ret != LTTNG_OK) {
392 goto error;
393 }
394
395 /* Flag every event that they are now enabled. */
396 rcu_read_lock();
fefd409b 397 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
f20baf8e 398 node.node) {
fefd409b 399 aevent->enabled = 1;
f20baf8e
DG
400 }
401 rcu_read_unlock();
402
403 ret = LTTNG_OK;
404
405error:
406 return ret;
407}
408
71a559f8
JG
409/*
410 * Check if this event's filter requires the activation of application contexts
411 * and enable them in the agent.
b4bc01f7
MD
412 * TODO: bytecode iterator does not support non-legacy application
413 * contexts yet. Not an issue for now, since they are not generated by
414 * the lttng-ctl library.
71a559f8
JG
415 */
416static int add_filter_app_ctx(struct lttng_filter_bytecode *bytecode,
417 const char *filter_expression, struct agent *agt)
418{
419 int ret = LTTNG_OK;
420 char *provider_name = NULL, *ctx_name = NULL;
421 struct bytecode_symbol_iterator *it =
422 bytecode_symbol_iterator_create(bytecode);
423
424 if (!it) {
425 ret = LTTNG_ERR_NOMEM;
426 goto end;
427 }
428
429 do {
430 struct lttng_event_context ctx;
431 const char *symbol_name =
432 bytecode_symbol_iterator_get_name(it);
433
434 if (parse_application_context(symbol_name, &provider_name,
435 &ctx_name)) {
436 /* Not an application context. */
437 continue;
438 }
439
440 ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT;
441 ctx.u.app_ctx.provider_name = provider_name;
442 ctx.u.app_ctx.ctx_name = ctx_name;
443
444 /* Recognized an application context. */
445 DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.",
446 filter_expression, provider_name, ctx_name);
447
448 ret = agent_add_context(&ctx, agt);
449 if (ret != LTTNG_OK) {
450 ERR("Failed to add application context %s:%s.",
451 provider_name, ctx_name);
452 goto end;
453 }
454
455 ret = agent_enable_context(&ctx, agt->domain);
456 if (ret != LTTNG_OK) {
457 ERR("Failed to enable application context %s:%s.",
458 provider_name, ctx_name);
459 goto end;
460 }
461
462 free(provider_name);
463 free(ctx_name);
464 provider_name = ctx_name = NULL;
465 } while (bytecode_symbol_iterator_next(it) == 0);
466end:
467 free(provider_name);
468 free(ctx_name);
469 bytecode_symbol_iterator_destroy(it);
470 return ret;
471}
472
f20baf8e 473/*
022d91ba 474 * Enable a single agent event for a given UST session.
f20baf8e
DG
475 *
476 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
477 */
fefd409b
DG
478int event_agent_enable(struct ltt_ust_session *usess,
479 struct agent *agt, struct lttng_event *event,
8404118c
JG
480 struct lttng_filter_bytecode *filter,
481 char *filter_expression)
f20baf8e
DG
482{
483 int ret, created = 0;
fefd409b 484 struct agent_event *aevent;
f20baf8e
DG
485
486 assert(usess);
487 assert(event);
fefd409b 488 assert(agt);
f20baf8e 489
022d91ba 490 DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d "
51755dc8
JG
491 ", loglevel %d and filter \"%s\"", event->name,
492 usess->id, event->loglevel_type, event->loglevel,
493 filter_expression ? filter_expression : "NULL");
f20baf8e 494
a9319624 495 aevent = agent_find_event(event->name, event->loglevel_type,
71a559f8 496 event->loglevel, filter_expression, agt);
fefd409b 497 if (!aevent) {
a9319624
PP
498 aevent = agent_create_event(event->name, event->loglevel_type,
499 event->loglevel, filter,
51755dc8 500 filter_expression);
fefd409b 501 if (!aevent) {
f20baf8e
DG
502 ret = LTTNG_ERR_NOMEM;
503 goto error;
504 }
71a559f8 505
f20baf8e
DG
506 created = 1;
507 }
508
509 /* Already enabled? */
fefd409b 510 if (aevent->enabled) {
f20baf8e
DG
511 goto end;
512 }
513
71a559f8
JG
514 if (created && filter) {
515 ret = add_filter_app_ctx(filter, filter_expression, agt);
516 if (ret != LTTNG_OK) {
517 goto error;
518 }
519 }
520
fefd409b 521 ret = agent_enable_event(aevent, agt->domain);
f20baf8e
DG
522 if (ret != LTTNG_OK) {
523 goto error;
524 }
525
526 /* If the event was created prior to the enable, add it to the domain. */
527 if (created) {
fefd409b 528 agent_add_event(aevent, agt);
f20baf8e
DG
529 }
530
531end:
532 return LTTNG_OK;
533
534error:
535 if (created) {
fefd409b 536 agent_destroy_event(aevent);
f20baf8e
DG
537 }
538 return ret;
539}
540
da6c3a50 541/*
d1ec8e20
JG
542 * Return the default event name associated with the provided UST domain. Return
543 * NULL on error.
da6c3a50
DG
544 */
545const char *event_get_default_agent_ust_name(enum lttng_domain_type domain)
546{
547 const char *default_event_name = NULL;
548
0e115563
DG
549 switch (domain) {
550 case LTTNG_DOMAIN_LOG4J:
d1ec8e20 551 default_event_name = DEFAULT_LOG4J_EVENT_NAME;
0e115563
DG
552 break;
553 case LTTNG_DOMAIN_JUL:
d1ec8e20 554 default_event_name = DEFAULT_JUL_EVENT_NAME;
0e115563
DG
555 break;
556 case LTTNG_DOMAIN_PYTHON:
e7c82272 557 default_event_name = DEFAULT_PYTHON_EVENT_NAME;
0e115563
DG
558 break;
559 default:
da6c3a50
DG
560 assert(0);
561 }
562
563 return default_event_name;
564}
565
f20baf8e 566/*
e261a6cc 567 * Disable a given agent event for a given UST session.
f20baf8e 568 *
e261a6cc 569 * Must be called with the RCU read lock held.
f20baf8e
DG
570 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
571 */
e261a6cc
PP
572static int event_agent_disable_one(struct ltt_ust_session *usess,
573 struct agent *agt, struct agent_event *aevent)
f20baf8e
DG
574{
575 int ret;
be6a6276
DG
576 struct ltt_ust_event *uevent = NULL;
577 struct ltt_ust_channel *uchan = NULL;
71aecbf8 578 const char *ust_event_name, *ust_channel_name;
f20baf8e 579
fefd409b 580 assert(agt);
f20baf8e 581 assert(usess);
e261a6cc 582 assert(aevent);
f20baf8e 583
e261a6cc
PP
584 DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64,
585 aevent->name, aevent->loglevel_type, aevent->loglevel_value,
586 usess->id);
f20baf8e
DG
587
588 /* Already disabled? */
fefd409b 589 if (!aevent->enabled) {
f20baf8e
DG
590 goto end;
591 }
592
71aecbf8
DG
593 if (agt->domain == LTTNG_DOMAIN_JUL) {
594 ust_channel_name = DEFAULT_JUL_CHANNEL_NAME;
595 } else if (agt->domain == LTTNG_DOMAIN_LOG4J) {
596 ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME;
0e115563
DG
597 } else if (agt->domain == LTTNG_DOMAIN_PYTHON) {
598 ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME;
71aecbf8
DG
599 } else {
600 ret = LTTNG_ERR_INVALID;
601 goto error;
602 }
603
be6a6276
DG
604 /*
605 * Disable it on the UST side. First get the channel reference then find
606 * the event and finally disable it.
607 */
608 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
71aecbf8 609 (char *) ust_channel_name);
be6a6276
DG
610 if (!uchan) {
611 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
612 goto error;
613 }
614
da6c3a50
DG
615 ust_event_name = event_get_default_agent_ust_name(agt->domain);
616 if (!ust_event_name) {
617 ret = LTTNG_ERR_FATAL;
618 goto error;
be6a6276
DG
619 }
620
621 /*
b953b8cd
PP
622 * Agent UST event has its loglevel type forced to
623 * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering
624 * happens thanks to an UST filter. The following -1 is actually
625 * ignored since the type is LTTNG_UST_LOGLEVEL_ALL.
be6a6276 626 */
da6c3a50 627 uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name,
b953b8cd 628 aevent->filter, LTTNG_UST_LOGLEVEL_ALL, -1, NULL);
022d91ba 629 /* If the agent event exists, it must be available on the UST side. */
be6a6276
DG
630 assert(uevent);
631
632 ret = ust_app_disable_event_glb(usess, uchan, uevent);
633 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
634 ret = LTTNG_ERR_UST_DISABLE_FAIL;
635 goto error;
636 }
637
0dcfcf94
DG
638 /*
639 * Flag event that it's disabled so the shadow copy on the ust app side
640 * will disable it if an application shows up.
641 */
642 uevent->enabled = 0;
643
fefd409b 644 ret = agent_disable_event(aevent, agt->domain);
f20baf8e
DG
645 if (ret != LTTNG_OK) {
646 goto error;
647 }
648
649end:
650 return LTTNG_OK;
651
652error:
653 return ret;
654}
e261a6cc
PP
655
656/*
657 * Disable all agent events matching a given name for a given UST session.
658 *
659 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
660 */
661int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt,
662 char *event_name)
663{
664 int ret = LTTNG_OK;
665 struct agent_event *aevent;
666 struct lttng_ht_iter iter;
667 struct lttng_ht_node_str *node;
668
669 assert(agt);
670 assert(usess);
671 assert(event_name);
672
673 DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id);
674
675 rcu_read_lock();
676 agent_find_events_by_name(event_name, agt, &iter);
677 node = lttng_ht_iter_get_node_str(&iter);
678
679 if (node == NULL) {
680 DBG2("Event agent NOT found by name %s", event_name);
681 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
682 goto end;
683 }
684
685 do {
686 aevent = caa_container_of(node, struct agent_event, node);
687 ret = event_agent_disable_one(usess, agt, aevent);
688
689 if (ret != LTTNG_OK) {
690 goto end;
691 }
692
693 /* Get next duplicate agent event by name. */
694 agent_event_next_duplicate(event_name, agt, &iter);
695 node = lttng_ht_iter_get_node_str(&iter);
696 } while (node);
697end:
698 rcu_read_unlock();
699 return ret;
700}
f20baf8e 701/*
022d91ba 702 * Disable all agent event for a given UST session.
f20baf8e
DG
703 *
704 * Return LTTNG_OK on success or else a LTTNG_ERR* code.
705 */
fefd409b
DG
706int event_agent_disable_all(struct ltt_ust_session *usess,
707 struct agent *agt)
f20baf8e 708{
0dcfcf94 709 int ret;
fefd409b 710 struct agent_event *aevent;
f20baf8e
DG
711 struct lttng_ht_iter iter;
712
fefd409b 713 assert(agt);
f20baf8e
DG
714 assert(usess);
715
0dcfcf94
DG
716 /*
717 * Disable event on agent application. Continue to disable all other events
718 * if the * event is not found.
719 */
fefd409b 720 ret = event_agent_disable(usess, agt, "*");
0dcfcf94
DG
721 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) {
722 goto error;
f20baf8e
DG
723 }
724
b9866e08 725 /* Disable every event. */
f20baf8e 726 rcu_read_lock();
fefd409b 727 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent,
f20baf8e 728 node.node) {
0dcfcf94
DG
729 if (!aevent->enabled) {
730 continue;
731 }
732
733 ret = event_agent_disable(usess, agt, aevent->name);
734 if (ret != LTTNG_OK) {
b9866e08 735 goto error_unlock;
f20baf8e 736 }
f20baf8e 737 }
f20baf8e
DG
738 ret = LTTNG_OK;
739
b9866e08
JG
740error_unlock:
741 rcu_read_unlock();
f20baf8e
DG
742error:
743 return ret;
744}
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