Fix: add missing free causing a memleak
[lttng-tools.git] / src / bin / lttng-sessiond / event.c
CommitLineData
54d01ffb
DG
1/*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 *
d14d33bf
AM
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License, version 2 only,
6 * as published by the Free Software Foundation.
54d01ffb 7 *
d14d33bf
AM
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
54d01ffb 12 *
d14d33bf
AM
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
54d01ffb
DG
16 */
17
be040666 18#define _GNU_SOURCE
d87bfb32 19#include <errno.h>
54d01ffb 20#include <urcu/list.h>
2bdd86d4 21#include <string.h>
54d01ffb
DG
22
23#include <lttng/lttng.h>
db758600 24#include <common/error.h>
10a8a223 25#include <common/sessiond-comm/sessiond-comm.h>
54d01ffb
DG
26
27#include "channel.h"
28#include "event.h"
4771f025 29#include "kernel.h"
9df8df5e 30#include "ust-ctl.h"
edb67388
DG
31#include "ust-app.h"
32#include "trace-kernel.h"
33#include "trace-ust.h"
54d01ffb 34
025faf73
DG
35/*
36 * Add unique UST event based on the event name, filter bytecode and loglevel.
37 */
18eace3b
DG
38static void add_unique_ust_event(struct lttng_ht *ht,
39 struct ltt_ust_event *event)
40{
41 struct cds_lfht_node *node_ptr;
42 struct ltt_ust_ht_key key;
43
44 assert(ht);
45 assert(ht->ht);
46 assert(event);
47
48 key.name = event->attr.name;
49 key.filter = (struct lttng_filter_bytecode *) event->filter;
50 key.loglevel = event->attr.loglevel;
51
52 node_ptr = cds_lfht_add_unique(ht->ht,
53 ht->hash_fct(event->node.key, lttng_ht_seed),
54 trace_ust_ht_match_event, &key, &event->node.node);
55 assert(node_ptr == &event->node.node);
56}
57
8c9ae521
DG
58/*
59 * Setup a lttng_event used to enable *all* syscall tracing.
60 */
61static void init_syscalls_kernel_event(struct lttng_event *event)
62{
0525e9ae
DG
63 assert(event);
64
8c9ae521
DG
65 event->name[0] = '\0';
66 /*
67 * We use LTTNG_EVENT* here since the trace kernel creation will make the
68 * right changes for the kernel.
69 */
70 event->type = LTTNG_EVENT_SYSCALL;
71}
72
54d01ffb 73/*
7a3d1328 74 * Disable kernel tracepoint event for a channel from the kernel session.
54d01ffb 75 */
d3a56674
DG
76int event_kernel_disable_tracepoint(struct ltt_kernel_channel *kchan,
77 char *event_name)
54d01ffb
DG
78{
79 int ret;
80 struct ltt_kernel_event *kevent;
81
0525e9ae
DG
82 assert(kchan);
83
54d01ffb
DG
84 kevent = trace_kernel_get_event_by_name(event_name, kchan);
85 if (kevent == NULL) {
f73fabfd 86 ret = LTTNG_ERR_NO_EVENT;
54d01ffb
DG
87 goto error;
88 }
89
90 ret = kernel_disable_event(kevent);
91 if (ret < 0) {
f73fabfd 92 ret = LTTNG_ERR_KERN_DISABLE_FAIL;
54d01ffb
DG
93 goto error;
94 }
95
96 DBG("Kernel event %s disable for channel %s.",
97 kevent->event->name, kchan->channel->name);
98
f73fabfd 99 ret = LTTNG_OK;
54d01ffb
DG
100
101error:
102 return ret;
103}
104
105/*
7a3d1328 106 * Disable kernel tracepoint events for a channel from the kernel session.
54d01ffb 107 */
d3a56674 108int event_kernel_disable_all_tracepoints(struct ltt_kernel_channel *kchan)
54d01ffb
DG
109{
110 int ret;
111 struct ltt_kernel_event *kevent;
112
0525e9ae
DG
113 assert(kchan);
114
54d01ffb
DG
115 /* For each event in the kernel session */
116 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
117 ret = kernel_disable_event(kevent);
118 if (ret < 0) {
119 /* We continue disabling the rest */
120 continue;
121 }
122 }
f73fabfd 123 ret = LTTNG_OK;
7a3d1328
MD
124 return ret;
125}
126
127/*
128 * Disable kernel syscall events for a channel from the kernel session.
129 */
d3a56674 130int event_kernel_disable_all_syscalls(struct ltt_kernel_channel *kchan)
7a3d1328
MD
131{
132 ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
f73fabfd 133 return LTTNG_OK; /* Return OK so disable all succeeds */
7a3d1328 134}
54d01ffb 135
7a3d1328
MD
136/*
137 * Disable all kernel event for a channel from the kernel session.
138 */
d3a56674 139int event_kernel_disable_all(struct ltt_kernel_channel *kchan)
7a3d1328
MD
140{
141 int ret;
142
0525e9ae
DG
143 assert(kchan);
144
d3a56674 145 ret = event_kernel_disable_all_tracepoints(kchan);
f73fabfd 146 if (ret != LTTNG_OK)
7a3d1328 147 return ret;
d3a56674 148 ret = event_kernel_disable_all_syscalls(kchan);
54d01ffb
DG
149 return ret;
150}
151
152/*
7a3d1328 153 * Enable kernel tracepoint event for a channel from the kernel session.
54d01ffb 154 */
d3a56674
DG
155int event_kernel_enable_tracepoint(struct ltt_kernel_channel *kchan,
156 struct lttng_event *event)
54d01ffb
DG
157{
158 int ret;
159 struct ltt_kernel_event *kevent;
160
0525e9ae
DG
161 assert(kchan);
162 assert(event);
163
54d01ffb
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164 kevent = trace_kernel_get_event_by_name(event->name, kchan);
165 if (kevent == NULL) {
166 ret = kernel_create_event(event, kchan);
167 if (ret < 0) {
bd29c13d
DG
168 switch (-ret) {
169 case EEXIST:
f73fabfd 170 ret = LTTNG_ERR_KERN_EVENT_EXIST;
bd29c13d
DG
171 break;
172 case ENOSYS:
f73fabfd 173 ret = LTTNG_ERR_KERN_EVENT_ENOSYS;
bd29c13d
DG
174 break;
175 default:
f73fabfd 176 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
bd29c13d 177 break;
d87bfb32 178 }
7a3d1328 179 goto end;
54d01ffb
DG
180 }
181 } else if (kevent->enabled == 0) {
182 ret = kernel_enable_event(kevent);
183 if (ret < 0) {
f73fabfd 184 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
7a3d1328 185 goto end;
54d01ffb 186 }
42224349
DG
187 } else {
188 /* At this point, the event is considered enabled */
f73fabfd 189 ret = LTTNG_ERR_KERN_EVENT_EXIST;
42224349 190 goto end;
54d01ffb 191 }
42224349 192
f73fabfd 193 ret = LTTNG_OK;
7a3d1328 194end:
54d01ffb
DG
195 return ret;
196}
197
198/*
7a3d1328 199 * Enable all kernel tracepoint events of a channel of the kernel session.
54d01ffb 200 */
d3a56674
DG
201int event_kernel_enable_all_tracepoints(struct ltt_kernel_channel *kchan,
202 int kernel_tracer_fd)
54d01ffb
DG
203{
204 int size, i, ret;
205 struct ltt_kernel_event *kevent;
8f69e5eb 206 struct lttng_event *event_list = NULL;
54d01ffb 207
0525e9ae
DG
208 assert(kchan);
209
54d01ffb
DG
210 /* For each event in the kernel session */
211 cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
8f69e5eb
DG
212 if (kevent->enabled == 0) {
213 ret = kernel_enable_event(kevent);
214 if (ret < 0) {
215 /* Enable failed but still continue */
216 continue;
217 }
54d01ffb
DG
218 }
219 }
220
221 size = kernel_list_events(kernel_tracer_fd, &event_list);
222 if (size < 0) {
f73fabfd 223 ret = LTTNG_ERR_KERN_LIST_FAIL;
7a3d1328 224 goto end;
54d01ffb
DG
225 }
226
227 for (i = 0; i < size; i++) {
228 kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan);
229 if (kevent == NULL) {
230 /* Default event type for enable all */
231 event_list[i].type = LTTNG_EVENT_TRACEPOINT;
232 /* Enable each single tracepoint event */
233 ret = kernel_create_event(&event_list[i], kchan);
234 if (ret < 0) {
235 /* Ignore error here and continue */
236 }
237 }
238 }
54d01ffb 239 free(event_list);
8f69e5eb 240
f73fabfd 241 ret = LTTNG_OK;
7a3d1328 242end:
54d01ffb
DG
243 return ret;
244}
8c9ae521
DG
245
246/*
7a3d1328 247 * Enable all kernel tracepoint events of a channel of the kernel session.
8c9ae521 248 */
d3a56674
DG
249int event_kernel_enable_all_syscalls(struct ltt_kernel_channel *kchan,
250 int kernel_tracer_fd)
8c9ae521
DG
251{
252 int ret;
253 struct lttng_event event;
254
0525e9ae
DG
255 assert(kchan);
256
8c9ae521
DG
257 init_syscalls_kernel_event(&event);
258
259 DBG("Enabling all syscall tracing");
260
261 ret = kernel_create_event(&event, kchan);
262 if (ret < 0) {
8f69e5eb 263 if (ret == -EEXIST) {
f73fabfd 264 ret = LTTNG_ERR_KERN_EVENT_EXIST;
8f69e5eb 265 } else {
f73fabfd 266 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
8f69e5eb 267 }
7a3d1328 268 goto end;
8c9ae521 269 }
8f69e5eb 270
f73fabfd 271 ret = LTTNG_OK;
7a3d1328
MD
272end:
273 return ret;
274}
8c9ae521 275
7a3d1328
MD
276/*
277 * Enable all kernel events of a channel of the kernel session.
278 */
d3a56674
DG
279int event_kernel_enable_all(struct ltt_kernel_channel *kchan,
280 int kernel_tracer_fd)
7a3d1328 281{
6bd8707a 282 int tp_ret;
7a3d1328 283
0525e9ae
DG
284 assert(kchan);
285
d3a56674 286 tp_ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
f73fabfd 287 if (tp_ret != LTTNG_OK) {
7a3d1328
MD
288 goto end;
289 }
bd29c13d
DG
290
291 /*
292 * Reaching this code path means that all tracepoints were enabled without
293 * errors so we ignore the error value of syscalls.
294 *
295 * At the moment, failing to enable syscalls on "lttng enable-event -a -k"
296 * is not considered an error that need to be returned to the client since
297 * tracepoints did not fail. Future work will allow us to send back
298 * multiple errors to the client in one API call.
299 */
d3a56674 300 (void) event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
bd29c13d 301
7a3d1328 302end:
bd29c13d 303 return tp_ret;
8c9ae521 304}
2bdd86d4 305
7f79d3a1
DG
306/*
307 * ============================
308 * UST : The Ultimate Frontier!
309 * ============================
310 */
311
76d45b40
DG
312/*
313 * Enable all UST tracepoints for a channel from a UST session.
314 */
7972aab2 315int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess,
025faf73 316 struct ltt_ust_channel *uchan, struct lttng_filter_bytecode *filter)
76d45b40 317{
6775595e 318 int ret, i, size;
bec39940 319 struct lttng_ht_iter iter;
76d45b40 320 struct ltt_ust_event *uevent = NULL;
7f79d3a1 321 struct lttng_event *events = NULL;
76d45b40 322
0525e9ae
DG
323 assert(usess);
324 assert(uchan);
325
025faf73
DG
326 rcu_read_lock();
327
7972aab2
DG
328 /* Enable existing events */
329 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
330 node.node) {
331 if (uevent->enabled == 0) {
332 ret = ust_app_enable_event_glb(usess, uchan, uevent);
333 if (ret < 0) {
76d45b40
DG
334 continue;
335 }
7972aab2
DG
336 uevent->enabled = 1;
337 }
338 }
76d45b40 339
7972aab2
DG
340 /* Get all UST available events */
341 size = ust_app_list_events(&events);
342 if (size < 0) {
343 ret = LTTNG_ERR_UST_LIST_FAIL;
344 goto error;
345 }
76d45b40 346
7972aab2
DG
347 for (i = 0; i < size; i++) {
348 /*
349 * Check if event exist and if so, continue since it was enable
350 * previously.
351 */
352 uevent = trace_ust_find_event(uchan->events, events[i].name, filter,
353 events[i].loglevel);
354 if (uevent != NULL) {
76d45b40
DG
355 ret = ust_app_enable_event_pid(usess, uchan, uevent,
356 events[i].pid);
357 if (ret < 0) {
7972aab2 358 if (ret != -LTTNG_UST_ERR_EXIST) {
f73fabfd 359 ret = LTTNG_ERR_UST_ENABLE_FAIL;
7972aab2 360 goto error;
76d45b40 361 }
76d45b40 362 }
7972aab2
DG
363 continue;
364 }
76d45b40 365
7972aab2
DG
366 /* Create ust event */
367 uevent = trace_ust_create_event(&events[i], filter);
368 if (uevent == NULL) {
369 ret = LTTNG_ERR_FATAL;
370 goto error_destroy;
76d45b40
DG
371 }
372
7972aab2
DG
373 /* Create event for the specific PID */
374 ret = ust_app_enable_event_pid(usess, uchan, uevent,
375 events[i].pid);
376 if (ret < 0) {
377 if (ret == -LTTNG_UST_ERR_EXIST) {
378 ret = LTTNG_ERR_UST_EVENT_EXIST;
379 goto error;
380 } else {
381 ret = LTTNG_ERR_UST_ENABLE_FAIL;
382 goto error_destroy;
383 }
384 }
385
386 uevent->enabled = 1;
387 /* Add ltt ust event to channel */
388 rcu_read_lock();
389 add_unique_ust_event(uchan->events, uevent);
390 rcu_read_unlock();
76d45b40 391 }
7972aab2 392 free(events);
76d45b40 393
025faf73 394 rcu_read_unlock();
f73fabfd 395 return LTTNG_OK;
76d45b40 396
7f79d3a1 397error_destroy:
76d45b40 398 trace_ust_destroy_event(uevent);
7f79d3a1
DG
399
400error:
401 free(events);
025faf73 402 rcu_read_unlock();
76d45b40
DG
403 return ret;
404}
405
2bdd86d4
MD
406/*
407 * Enable UST tracepoint event for a channel from a UST session.
408 */
7972aab2 409int event_ust_enable_tracepoint(struct ltt_ust_session *usess,
025faf73
DG
410 struct ltt_ust_channel *uchan, struct lttng_event *event,
411 struct lttng_filter_bytecode *filter)
2bdd86d4 412{
f73fabfd 413 int ret = LTTNG_OK, to_create = 0;
edb67388
DG
414 struct ltt_ust_event *uevent;
415
0525e9ae
DG
416 assert(usess);
417 assert(uchan);
418 assert(event);
419
18eace3b
DG
420 rcu_read_lock();
421
025faf73 422 uevent = trace_ust_find_event(uchan->events, event->name, filter,
18eace3b 423 event->loglevel);
edb67388 424 if (uevent == NULL) {
025faf73 425 uevent = trace_ust_create_event(event, filter);
edb67388 426 if (uevent == NULL) {
95a82664 427 ret = LTTNG_ERR_UST_ENABLE_FAIL;
edb67388
DG
428 goto error;
429 }
025faf73 430
fc34caaa 431 /* Valid to set it after the goto error since uevent is still NULL */
edb67388
DG
432 to_create = 1;
433 }
2bdd86d4 434
7f79d3a1
DG
435 if (uevent->enabled) {
436 /* It's already enabled so everything is OK */
5bcdda4f 437 ret = LTTNG_ERR_UST_EVENT_ENABLED;
7f79d3a1
DG
438 goto end;
439 }
440
fc34caaa
DG
441 uevent->enabled = 1;
442
7972aab2
DG
443 if (to_create) {
444 /* Create event on all UST registered apps for session */
445 ret = ust_app_create_event_glb(usess, uchan, uevent);
446 } else {
447 /* Enable event on all UST registered apps for session */
448 ret = ust_app_enable_event_glb(usess, uchan, uevent);
449 }
48842b30 450
7972aab2
DG
451 if (ret < 0) {
452 if (ret == -LTTNG_UST_ERR_EXIST) {
453 ret = LTTNG_ERR_UST_EVENT_EXIST;
454 goto end;
455 } else {
456 ret = LTTNG_ERR_UST_ENABLE_FAIL;
457 goto error;
edb67388 458 }
2bdd86d4 459 }
48842b30 460
7f79d3a1 461 if (to_create) {
fc34caaa 462 /* Add ltt ust event to channel */
18eace3b 463 add_unique_ust_event(uchan->events, uevent);
7f79d3a1 464 }
edb67388 465
7f79d3a1
DG
466 DBG("Event UST %s %s in channel %s", uevent->attr.name,
467 to_create ? "created" : "enabled", uchan->name);
468
f73fabfd 469 ret = LTTNG_OK;
fc34caaa 470
fb89d070 471end:
18eace3b 472 rcu_read_unlock();
fc34caaa 473 return ret;
edb67388
DG
474
475error:
fc34caaa
DG
476 /*
477 * Only destroy event on creation time (not enabling time) because if the
478 * event is found in the channel (to_create == 0), it means that at some
479 * point the enable_event worked and it's thus valid to keep it alive.
480 * Destroying it also implies that we also destroy it's shadow copy to sync
481 * everyone up.
482 */
483 if (to_create) {
484 /* In this code path, the uevent was not added to the hash table */
485 trace_ust_destroy_event(uevent);
486 }
18eace3b 487 rcu_read_unlock();
2bdd86d4
MD
488 return ret;
489}
490
7f79d3a1
DG
491/*
492 * Disable UST tracepoint of a channel from a UST session.
493 */
7972aab2 494int event_ust_disable_tracepoint(struct ltt_ust_session *usess,
7f79d3a1 495 struct ltt_ust_channel *uchan, char *event_name)
2bdd86d4
MD
496{
497 int ret;
7f79d3a1 498 struct ltt_ust_event *uevent;
18eace3b
DG
499 struct lttng_ht_node_str *node;
500 struct lttng_ht_iter iter;
18eace3b 501 struct lttng_ht *ht;
2bdd86d4 502
0525e9ae
DG
503 assert(usess);
504 assert(uchan);
505 assert(event_name);
506
18eace3b
DG
507 ht = uchan->events;
508
18eace3b 509 rcu_read_lock();
025faf73
DG
510
511 /*
512 * We use a custom lookup since we need the iterator for the next_duplicate
513 * call in the do while loop below.
514 */
515 cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed),
516 trace_ust_ht_match_event_by_name, event_name, &iter.iter);
18eace3b
DG
517 node = lttng_ht_iter_get_node_str(&iter);
518 if (node == NULL) {
519 DBG2("Trace UST event NOT found by name %s", event_name);
f73fabfd 520 ret = LTTNG_ERR_UST_EVENT_NOT_FOUND;
7f79d3a1 521 goto error;
2bdd86d4 522 }
7f79d3a1 523
18eace3b
DG
524 do {
525 uevent = caa_container_of(node, struct ltt_ust_event, node);
025faf73
DG
526 assert(uevent);
527
18eace3b
DG
528 if (uevent->enabled == 0) {
529 /* It's already disabled so everything is OK */
530 ret = LTTNG_OK;
531 continue;
7f79d3a1 532 }
18eace3b 533
7972aab2
DG
534 ret = ust_app_disable_event_glb(usess, uchan, uevent);
535 if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) {
536 ret = LTTNG_ERR_UST_DISABLE_FAIL;
18eace3b
DG
537 goto error;
538 }
18eace3b
DG
539 uevent->enabled = 0;
540
025faf73
DG
541 DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
542 uchan->name);
543
18eace3b
DG
544 /* Get next duplicate event by name. */
545 cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name,
546 event_name, &iter.iter);
547 node = lttng_ht_iter_get_node_str(&iter);
548 } while (node);
7f79d3a1 549
f73fabfd 550 ret = LTTNG_OK;
7f79d3a1 551
7f79d3a1 552error:
18eace3b 553 rcu_read_unlock();
7f79d3a1
DG
554 return ret;
555}
556
557/*
558 * Disable all UST tracepoints for a channel from a UST session.
559 */
7972aab2 560int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess,
7f79d3a1
DG
561 struct ltt_ust_channel *uchan)
562{
6775595e 563 int ret, i, size;
bec39940 564 struct lttng_ht_iter iter;
7f79d3a1
DG
565 struct ltt_ust_event *uevent = NULL;
566 struct lttng_event *events = NULL;
567
0525e9ae
DG
568 assert(usess);
569 assert(uchan);
570
025faf73
DG
571 rcu_read_lock();
572
7972aab2
DG
573 /* Disabling existing events */
574 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
575 node.node) {
576 if (uevent->enabled == 1) {
577 ret = event_ust_disable_tracepoint(usess, uchan,
578 uevent->attr.name);
579 if (ret < 0) {
7f79d3a1
DG
580 continue;
581 }
582 }
7f79d3a1 583 }
7972aab2
DG
584
585 /* Get all UST available events */
586 size = ust_app_list_events(&events);
587 if (size < 0) {
588 ret = LTTNG_ERR_UST_LIST_FAIL;
7f79d3a1
DG
589 goto error;
590 }
591
7972aab2
DG
592 for (i = 0; i < size; i++) {
593 ret = event_ust_disable_tracepoint(usess, uchan,
594 events[i].name);
595 if (ret != LTTNG_OK) {
596 /* Continue to disable the rest... */
597 continue;
598 }
599 }
600 free(events);
601
025faf73 602 rcu_read_unlock();
f73fabfd 603 return LTTNG_OK;
7f79d3a1
DG
604
605error:
606 free(events);
025faf73 607 rcu_read_unlock();
2bdd86d4
MD
608 return ret;
609}
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