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Implement lttng-list for userspace-probe
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #define _LGPL_SOURCE
20 #include <assert.h>
21 #include <inttypes.h>
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
24 #include <sys/stat.h>
25
26 #include <common/defaults.h>
27 #include <common/common.h>
28 #include <common/sessiond-comm/sessiond-comm.h>
29 #include <common/relayd/relayd.h>
30 #include <common/utils.h>
31 #include <common/compat/string.h>
32 #include <common/kernel-ctl/kernel-ctl.h>
33 #include <common/dynamic-buffer.h>
34 #include <common/buffer-view.h>
35 #include <lttng/trigger/trigger-internal.h>
36 #include <lttng/condition/condition.h>
37 #include <lttng/action/action.h>
38 #include <lttng/channel.h>
39 #include <lttng/channel-internal.h>
40 #include <lttng/rotate-internal.h>
41 #include <lttng/location-internal.h>
42 #include <lttng/userspace-probe-internal.h>
43 #include <common/string-utils/string-utils.h>
44
45 #include "channel.h"
46 #include "consumer.h"
47 #include "event.h"
48 #include "health-sessiond.h"
49 #include "kernel.h"
50 #include "kernel-consumer.h"
51 #include "lttng-sessiond.h"
52 #include "utils.h"
53 #include "lttng-syscall.h"
54 #include "agent.h"
55 #include "buffer-registry.h"
56 #include "notification-thread.h"
57 #include "notification-thread-commands.h"
58 #include "rotate.h"
59 #include "rotation-thread.h"
60 #include "sessiond-timer.h"
61 #include "agent-thread.h"
62
63 #include "cmd.h"
64
65 /* Sleep for 100ms between each check for the shm path's deletion. */
66 #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
67
68 static enum lttng_error_code wait_on_path(void *path);
69
70 /*
71 * Command completion handler that is used by the destroy command
72 * when a session that has a non-default shm_path is being destroyed.
73 *
74 * See comment in cmd_destroy_session() for the rationale.
75 */
76 static struct destroy_completion_handler {
77 struct cmd_completion_handler handler;
78 char shm_path[member_sizeof(struct ltt_session, shm_path)];
79 } destroy_completion_handler = {
80 .handler = {
81 .run = wait_on_path,
82 .data = destroy_completion_handler.shm_path
83 },
84 .shm_path = { 0 },
85 };
86
87 static struct cmd_completion_handler *current_completion_handler;
88
89 /*
90 * Used to keep a unique index for each relayd socket created where this value
91 * is associated with streams on the consumer so it can match the right relayd
92 * to send to. It must be accessed with the relayd_net_seq_idx_lock
93 * held.
94 */
95 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
96 static uint64_t relayd_net_seq_idx;
97
98 static int validate_ust_event_name(const char *);
99 static int cmd_enable_event_internal(struct ltt_session *session,
100 struct lttng_domain *domain,
101 char *channel_name, struct lttng_event *event,
102 char *filter_expression,
103 struct lttng_filter_bytecode *filter,
104 struct lttng_event_exclusion *exclusion,
105 int wpipe);
106
107 /*
108 * Create a session path used by list_lttng_sessions for the case that the
109 * session consumer is on the network.
110 */
111 static int build_network_session_path(char *dst, size_t size,
112 struct ltt_session *session)
113 {
114 int ret, kdata_port, udata_port;
115 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
116 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
117
118 assert(session);
119 assert(dst);
120
121 memset(tmp_urls, 0, sizeof(tmp_urls));
122 memset(tmp_uurl, 0, sizeof(tmp_uurl));
123
124 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
125
126 if (session->kernel_session && session->kernel_session->consumer) {
127 kuri = &session->kernel_session->consumer->dst.net.control;
128 kdata_port = session->kernel_session->consumer->dst.net.data.port;
129 }
130
131 if (session->ust_session && session->ust_session->consumer) {
132 uuri = &session->ust_session->consumer->dst.net.control;
133 udata_port = session->ust_session->consumer->dst.net.data.port;
134 }
135
136 if (uuri == NULL && kuri == NULL) {
137 uri = &session->consumer->dst.net.control;
138 kdata_port = session->consumer->dst.net.data.port;
139 } else if (kuri && uuri) {
140 ret = uri_compare(kuri, uuri);
141 if (ret) {
142 /* Not Equal */
143 uri = kuri;
144 /* Build uuri URL string */
145 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
146 if (ret < 0) {
147 goto error;
148 }
149 } else {
150 uri = kuri;
151 }
152 } else if (kuri && uuri == NULL) {
153 uri = kuri;
154 } else if (uuri && kuri == NULL) {
155 uri = uuri;
156 }
157
158 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
159 if (ret < 0) {
160 goto error;
161 }
162
163 /*
164 * Do we have a UST url set. If yes, this means we have both kernel and UST
165 * to print.
166 */
167 if (*tmp_uurl != '\0') {
168 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
169 tmp_urls, kdata_port, tmp_uurl, udata_port);
170 } else {
171 int dport;
172 if (kuri || (!kuri && !uuri)) {
173 dport = kdata_port;
174 } else {
175 /* No kernel URI, use the UST port. */
176 dport = udata_port;
177 }
178 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
179 }
180
181 error:
182 return ret;
183 }
184
185 /*
186 * Get run-time attributes if the session has been started (discarded events,
187 * lost packets).
188 */
189 static int get_kernel_runtime_stats(struct ltt_session *session,
190 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
191 uint64_t *lost_packets)
192 {
193 int ret;
194
195 if (!session->has_been_started) {
196 ret = 0;
197 *discarded_events = 0;
198 *lost_packets = 0;
199 goto end;
200 }
201
202 ret = consumer_get_discarded_events(session->id, kchan->key,
203 session->kernel_session->consumer,
204 discarded_events);
205 if (ret < 0) {
206 goto end;
207 }
208
209 ret = consumer_get_lost_packets(session->id, kchan->key,
210 session->kernel_session->consumer,
211 lost_packets);
212 if (ret < 0) {
213 goto end;
214 }
215
216 end:
217 return ret;
218 }
219
220 /*
221 * Get run-time attributes if the session has been started (discarded events,
222 * lost packets).
223 */
224 static int get_ust_runtime_stats(struct ltt_session *session,
225 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
226 uint64_t *lost_packets)
227 {
228 int ret;
229 struct ltt_ust_session *usess;
230
231 if (!discarded_events || !lost_packets) {
232 ret = -1;
233 goto end;
234 }
235
236 usess = session->ust_session;
237 assert(discarded_events);
238 assert(lost_packets);
239
240 if (!usess || !session->has_been_started) {
241 *discarded_events = 0;
242 *lost_packets = 0;
243 ret = 0;
244 goto end;
245 }
246
247 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
248 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
249 &usess->buffer_reg_uid_list,
250 usess->consumer, uchan->id,
251 uchan->attr.overwrite,
252 discarded_events,
253 lost_packets);
254 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
255 ret = ust_app_pid_get_channel_runtime_stats(usess,
256 uchan, usess->consumer,
257 uchan->attr.overwrite,
258 discarded_events,
259 lost_packets);
260 if (ret < 0) {
261 goto end;
262 }
263 *discarded_events += uchan->per_pid_closed_app_discarded;
264 *lost_packets += uchan->per_pid_closed_app_lost;
265 } else {
266 ERR("Unsupported buffer type");
267 assert(0);
268 ret = -1;
269 goto end;
270 }
271
272 end:
273 return ret;
274 }
275
276 /*
277 * Fill lttng_channel array of all channels.
278 */
279 static ssize_t list_lttng_channels(enum lttng_domain_type domain,
280 struct ltt_session *session, struct lttng_channel *channels,
281 struct lttng_channel_extended *chan_exts)
282 {
283 int i = 0, ret = 0;
284 struct ltt_kernel_channel *kchan;
285
286 DBG("Listing channels for session %s", session->name);
287
288 switch (domain) {
289 case LTTNG_DOMAIN_KERNEL:
290 /* Kernel channels */
291 if (session->kernel_session != NULL) {
292 cds_list_for_each_entry(kchan,
293 &session->kernel_session->channel_list.head, list) {
294 uint64_t discarded_events, lost_packets;
295 struct lttng_channel_extended *extended;
296
297 extended = (struct lttng_channel_extended *)
298 kchan->channel->attr.extended.ptr;
299
300 ret = get_kernel_runtime_stats(session, kchan,
301 &discarded_events, &lost_packets);
302 if (ret < 0) {
303 goto end;
304 }
305 /* Copy lttng_channel struct to array */
306 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
307 channels[i].enabled = kchan->enabled;
308 chan_exts[i].discarded_events =
309 discarded_events;
310 chan_exts[i].lost_packets = lost_packets;
311 chan_exts[i].monitor_timer_interval =
312 extended->monitor_timer_interval;
313 chan_exts[i].blocking_timeout = 0;
314 i++;
315 }
316 }
317 break;
318 case LTTNG_DOMAIN_UST:
319 {
320 struct lttng_ht_iter iter;
321 struct ltt_ust_channel *uchan;
322
323 rcu_read_lock();
324 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
325 &iter.iter, uchan, node.node) {
326 uint64_t discarded_events = 0, lost_packets = 0;
327
328 if (lttng_strncpy(channels[i].name, uchan->name,
329 LTTNG_SYMBOL_NAME_LEN)) {
330 break;
331 }
332 channels[i].attr.overwrite = uchan->attr.overwrite;
333 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
334 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
335 channels[i].attr.switch_timer_interval =
336 uchan->attr.switch_timer_interval;
337 channels[i].attr.read_timer_interval =
338 uchan->attr.read_timer_interval;
339 channels[i].enabled = uchan->enabled;
340 channels[i].attr.tracefile_size = uchan->tracefile_size;
341 channels[i].attr.tracefile_count = uchan->tracefile_count;
342
343 /*
344 * Map enum lttng_ust_output to enum lttng_event_output.
345 */
346 switch (uchan->attr.output) {
347 case LTTNG_UST_MMAP:
348 channels[i].attr.output = LTTNG_EVENT_MMAP;
349 break;
350 default:
351 /*
352 * LTTNG_UST_MMAP is the only supported UST
353 * output mode.
354 */
355 assert(0);
356 break;
357 }
358
359 chan_exts[i].monitor_timer_interval =
360 uchan->monitor_timer_interval;
361 chan_exts[i].blocking_timeout =
362 uchan->attr.u.s.blocking_timeout;
363
364 ret = get_ust_runtime_stats(session, uchan,
365 &discarded_events, &lost_packets);
366 if (ret < 0) {
367 break;
368 }
369 chan_exts[i].discarded_events = discarded_events;
370 chan_exts[i].lost_packets = lost_packets;
371 i++;
372 }
373 rcu_read_unlock();
374 break;
375 }
376 default:
377 break;
378 }
379
380 end:
381 if (ret < 0) {
382 return -LTTNG_ERR_FATAL;
383 } else {
384 return LTTNG_OK;
385 }
386 }
387
388 static int increment_extended_len(const char *filter_expression,
389 struct lttng_event_exclusion *exclusion,
390 const struct lttng_userspace_probe_location *probe_location,
391 size_t *extended_len)
392 {
393 int ret = 0;
394
395 *extended_len += sizeof(struct lttcomm_event_extended_header);
396
397 if (filter_expression) {
398 *extended_len += strlen(filter_expression) + 1;
399 }
400
401 if (exclusion) {
402 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
403 }
404
405 if (probe_location) {
406 ret = lttng_userspace_probe_location_serialize(probe_location,
407 NULL, NULL);
408 if (ret < 0) {
409 goto end;
410 }
411 *extended_len += ret;
412 }
413 ret = 0;
414 end:
415 return ret;
416 }
417
418 static int append_extended_info(const char *filter_expression,
419 struct lttng_event_exclusion *exclusion,
420 struct lttng_userspace_probe_location *probe_location,
421 void **extended_at)
422 {
423 int ret = 0;
424 size_t filter_len = 0;
425 size_t nb_exclusions = 0;
426 size_t userspace_probe_location_len = 0;
427 struct lttng_dynamic_buffer location_buffer;
428 struct lttcomm_event_extended_header extended_header;
429
430 if (filter_expression) {
431 filter_len = strlen(filter_expression) + 1;
432 }
433
434 if (exclusion) {
435 nb_exclusions = exclusion->count;
436 }
437
438 if (probe_location) {
439 lttng_dynamic_buffer_init(&location_buffer);
440 ret = lttng_userspace_probe_location_serialize(probe_location,
441 &location_buffer, NULL);
442 if (ret < 0) {
443 ret = -1;
444 goto end;
445 }
446 userspace_probe_location_len = location_buffer.size;
447 }
448
449 /* Set header fields */
450 extended_header.filter_len = filter_len;
451 extended_header.nb_exclusions = nb_exclusions;
452 extended_header.userspace_probe_location_len = userspace_probe_location_len;
453
454 /* Copy header */
455 memcpy(*extended_at, &extended_header, sizeof(extended_header));
456 *extended_at += sizeof(extended_header);
457
458 /* Copy filter string */
459 if (filter_expression) {
460 memcpy(*extended_at, filter_expression, filter_len);
461 *extended_at += filter_len;
462 }
463
464 /* Copy exclusion names */
465 if (exclusion) {
466 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
467
468 memcpy(*extended_at, &exclusion->names, len);
469 *extended_at += len;
470 }
471
472 if (probe_location) {
473 memcpy(*extended_at, location_buffer.data, location_buffer.size);
474 *extended_at += location_buffer.size;
475 lttng_dynamic_buffer_reset(&location_buffer);
476 }
477 ret = 0;
478 end:
479 return ret;
480 }
481
482 /*
483 * Create a list of agent domain events.
484 *
485 * Return number of events in list on success or else a negative value.
486 */
487 static int list_lttng_agent_events(struct agent *agt,
488 struct lttng_event **events, size_t *total_size)
489 {
490 int i = 0, ret = 0;
491 unsigned int nb_event = 0;
492 struct agent_event *event;
493 struct lttng_event *tmp_events;
494 struct lttng_ht_iter iter;
495 size_t extended_len = 0;
496 void *extended_at;
497
498 assert(agt);
499 assert(events);
500
501 DBG3("Listing agent events");
502
503 rcu_read_lock();
504 nb_event = lttng_ht_get_count(agt->events);
505 rcu_read_unlock();
506 if (nb_event == 0) {
507 ret = nb_event;
508 *total_size = 0;
509 goto error;
510 }
511
512 /* Compute required extended infos size */
513 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
514
515 /*
516 * This is only valid because the commands which add events are
517 * processed in the same thread as the listing.
518 */
519 rcu_read_lock();
520 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
521 ret = increment_extended_len(event->filter_expression, NULL, NULL,
522 &extended_len);
523 if (ret) {
524 DBG("Error computing the length of extended info message");
525 ret = -LTTNG_ERR_FATAL;
526 goto error;
527 }
528 }
529 rcu_read_unlock();
530
531 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
532 tmp_events = zmalloc(*total_size);
533 if (!tmp_events) {
534 PERROR("zmalloc agent events session");
535 ret = -LTTNG_ERR_FATAL;
536 goto error;
537 }
538
539 extended_at = ((uint8_t *) tmp_events) +
540 nb_event * sizeof(struct lttng_event);
541
542 rcu_read_lock();
543 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
544 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
545 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
546 tmp_events[i].enabled = event->enabled;
547 tmp_events[i].loglevel = event->loglevel_value;
548 tmp_events[i].loglevel_type = event->loglevel_type;
549 i++;
550
551 /* Append extended info */
552 ret = append_extended_info(event->filter_expression, NULL, NULL,
553 &extended_at);
554 if (ret) {
555 DBG("Error appending extended info message");
556 ret = -LTTNG_ERR_FATAL;
557 goto error;
558 }
559 }
560
561 *events = tmp_events;
562 ret = nb_event;
563 assert(nb_event == i);
564
565 error:
566 rcu_read_unlock();
567 return ret;
568 }
569
570 /*
571 * Create a list of ust global domain events.
572 */
573 static int list_lttng_ust_global_events(char *channel_name,
574 struct ltt_ust_domain_global *ust_global,
575 struct lttng_event **events, size_t *total_size)
576 {
577 int i = 0, ret = 0;
578 unsigned int nb_event = 0;
579 struct lttng_ht_iter iter;
580 struct lttng_ht_node_str *node;
581 struct ltt_ust_channel *uchan;
582 struct ltt_ust_event *uevent;
583 struct lttng_event *tmp;
584 size_t extended_len = 0;
585 void *extended_at;
586
587 DBG("Listing UST global events for channel %s", channel_name);
588
589 rcu_read_lock();
590
591 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
592 node = lttng_ht_iter_get_node_str(&iter);
593 if (node == NULL) {
594 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
595 goto end;
596 }
597
598 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
599
600 nb_event = lttng_ht_get_count(uchan->events);
601 if (nb_event == 0) {
602 ret = nb_event;
603 *total_size = 0;
604 goto end;
605 }
606
607 DBG3("Listing UST global %d events", nb_event);
608
609 /* Compute required extended infos size */
610 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
611 if (uevent->internal) {
612 nb_event--;
613 continue;
614 }
615
616 ret = increment_extended_len(uevent->filter_expression,
617 uevent->exclusion, NULL, &extended_len);
618 if (ret) {
619 DBG("Error computing the length of extended info message");
620 ret = -LTTNG_ERR_FATAL;
621 goto end;
622 }
623 }
624 if (nb_event == 0) {
625 /* All events are internal, skip. */
626 ret = 0;
627 *total_size = 0;
628 goto end;
629 }
630
631 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
632 tmp = zmalloc(*total_size);
633 if (tmp == NULL) {
634 ret = -LTTNG_ERR_FATAL;
635 goto end;
636 }
637
638 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
639
640 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
641 if (uevent->internal) {
642 /* This event should remain hidden from clients */
643 continue;
644 }
645 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
646 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
647 tmp[i].enabled = uevent->enabled;
648
649 switch (uevent->attr.instrumentation) {
650 case LTTNG_UST_TRACEPOINT:
651 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
652 break;
653 case LTTNG_UST_PROBE:
654 tmp[i].type = LTTNG_EVENT_PROBE;
655 break;
656 case LTTNG_UST_FUNCTION:
657 tmp[i].type = LTTNG_EVENT_FUNCTION;
658 break;
659 }
660
661 tmp[i].loglevel = uevent->attr.loglevel;
662 switch (uevent->attr.loglevel_type) {
663 case LTTNG_UST_LOGLEVEL_ALL:
664 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
665 break;
666 case LTTNG_UST_LOGLEVEL_RANGE:
667 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
668 break;
669 case LTTNG_UST_LOGLEVEL_SINGLE:
670 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
671 break;
672 }
673 if (uevent->filter) {
674 tmp[i].filter = 1;
675 }
676 if (uevent->exclusion) {
677 tmp[i].exclusion = 1;
678 }
679 i++;
680
681 /* Append extended info */
682 ret = append_extended_info(uevent->filter_expression,
683 uevent->exclusion, NULL, &extended_at);
684 if (ret) {
685 DBG("Error appending extended info message");
686 ret = -LTTNG_ERR_FATAL;
687 goto end;
688 }
689 }
690
691 ret = nb_event;
692 *events = tmp;
693 end:
694 rcu_read_unlock();
695 return ret;
696 }
697
698 /*
699 * Fill lttng_event array of all kernel events in the channel.
700 */
701 static int list_lttng_kernel_events(char *channel_name,
702 struct ltt_kernel_session *kernel_session,
703 struct lttng_event **events, size_t *total_size)
704 {
705 int i = 0, ret;
706 unsigned int nb_event;
707 struct ltt_kernel_event *event;
708 struct ltt_kernel_channel *kchan;
709 size_t extended_len = 0;
710 void *extended_at;
711
712 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
713 if (kchan == NULL) {
714 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
715 goto error;
716 }
717
718 nb_event = kchan->event_count;
719
720 DBG("Listing events for channel %s", kchan->channel->name);
721
722 if (nb_event == 0) {
723 *total_size = 0;
724 *events = NULL;
725 goto end;
726 }
727
728 /* Compute required extended infos size */
729 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
730 ret = increment_extended_len(event->filter_expression, NULL,
731 event->userspace_probe_location,
732 &extended_len);
733 if (ret) {
734 DBG("Error computing the length of extended info message");
735 ret = -LTTNG_ERR_FATAL;
736 goto error;
737 }
738 }
739
740 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
741 *events = zmalloc(*total_size);
742 if (*events == NULL) {
743 ret = -LTTNG_ERR_FATAL;
744 goto error;
745 }
746
747 extended_at = ((void *) *events) +
748 nb_event * sizeof(struct lttng_event);
749
750 /* Kernel channels */
751 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
752 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
753 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
754 (*events)[i].enabled = event->enabled;
755 (*events)[i].filter =
756 (unsigned char) !!event->filter_expression;
757
758 switch (event->event->instrumentation) {
759 case LTTNG_KERNEL_TRACEPOINT:
760 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
761 break;
762 case LTTNG_KERNEL_KRETPROBE:
763 (*events)[i].type = LTTNG_EVENT_FUNCTION;
764 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
765 sizeof(struct lttng_kernel_kprobe));
766 break;
767 case LTTNG_KERNEL_KPROBE:
768 (*events)[i].type = LTTNG_EVENT_PROBE;
769 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
770 sizeof(struct lttng_kernel_kprobe));
771 break;
772 case LTTNG_KERNEL_UPROBE:
773 (*events)[i].type = LTTNG_EVENT_USERSPACE_PROBE;
774 break;
775 case LTTNG_KERNEL_FUNCTION:
776 (*events)[i].type = LTTNG_EVENT_FUNCTION;
777 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
778 sizeof(struct lttng_kernel_function));
779 break;
780 case LTTNG_KERNEL_NOOP:
781 (*events)[i].type = LTTNG_EVENT_NOOP;
782 break;
783 case LTTNG_KERNEL_SYSCALL:
784 (*events)[i].type = LTTNG_EVENT_SYSCALL;
785 break;
786 case LTTNG_KERNEL_ALL:
787 /* fall-through. */
788 default:
789 assert(0);
790 break;
791 }
792 i++;
793
794 /* Append extended info */
795 ret = append_extended_info(event->filter_expression, NULL,
796 event->userspace_probe_location, &extended_at);
797 if (ret) {
798 DBG("Error appending extended info message");
799 ret = -LTTNG_ERR_FATAL;
800 goto error;
801 }
802 }
803
804 end:
805 return nb_event;
806
807 error:
808 /* Negate the error code to differentiate the size from an error */
809 return -ret;
810 }
811
812 /*
813 * Add URI so the consumer output object. Set the correct path depending on the
814 * domain adding the default trace directory.
815 */
816 static int add_uri_to_consumer(struct consumer_output *consumer,
817 struct lttng_uri *uri, enum lttng_domain_type domain,
818 const char *session_name)
819 {
820 int ret = LTTNG_OK;
821 const char *default_trace_dir;
822
823 assert(uri);
824
825 if (consumer == NULL) {
826 DBG("No consumer detected. Don't add URI. Stopping.");
827 ret = LTTNG_ERR_NO_CONSUMER;
828 goto error;
829 }
830
831 switch (domain) {
832 case LTTNG_DOMAIN_KERNEL:
833 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
834 break;
835 case LTTNG_DOMAIN_UST:
836 default_trace_dir = DEFAULT_UST_TRACE_DIR;
837 break;
838 default:
839 /*
840 * This case is possible is we try to add the URI to the global tracing
841 * session consumer object which in this case there is no subdir.
842 */
843 default_trace_dir = "";
844 }
845
846 switch (uri->dtype) {
847 case LTTNG_DST_IPV4:
848 case LTTNG_DST_IPV6:
849 DBG2("Setting network URI to consumer");
850
851 if (consumer->type == CONSUMER_DST_NET) {
852 if ((uri->stype == LTTNG_STREAM_CONTROL &&
853 consumer->dst.net.control_isset) ||
854 (uri->stype == LTTNG_STREAM_DATA &&
855 consumer->dst.net.data_isset)) {
856 ret = LTTNG_ERR_URL_EXIST;
857 goto error;
858 }
859 } else {
860 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
861 }
862
863 consumer->type = CONSUMER_DST_NET;
864
865 /* Set URI into consumer output object */
866 ret = consumer_set_network_uri(consumer, uri);
867 if (ret < 0) {
868 ret = -ret;
869 goto error;
870 } else if (ret == 1) {
871 /*
872 * URI was the same in the consumer so we do not append the subdir
873 * again so to not duplicate output dir.
874 */
875 ret = LTTNG_OK;
876 goto error;
877 }
878
879 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
880 ret = consumer_set_subdir(consumer, session_name);
881 if (ret < 0) {
882 ret = LTTNG_ERR_FATAL;
883 goto error;
884 }
885 }
886
887 if (uri->stype == LTTNG_STREAM_CONTROL) {
888 /* On a new subdir, reappend the default trace dir. */
889 strncat(consumer->subdir, default_trace_dir,
890 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
891 DBG3("Append domain trace name to subdir %s", consumer->subdir);
892 }
893
894 break;
895 case LTTNG_DST_PATH:
896 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
897 memset(consumer->dst.session_root_path, 0,
898 sizeof(consumer->dst.session_root_path));
899 /* Explicit length checks for strcpy and strcat. */
900 if (strlen(uri->dst.path) + strlen(default_trace_dir)
901 >= sizeof(consumer->dst.session_root_path)) {
902 ret = LTTNG_ERR_FATAL;
903 goto error;
904 }
905 strcpy(consumer->dst.session_root_path, uri->dst.path);
906 /* Append default trace dir */
907 strcat(consumer->dst.session_root_path, default_trace_dir);
908 /* Flag consumer as local. */
909 consumer->type = CONSUMER_DST_LOCAL;
910 break;
911 }
912
913 ret = LTTNG_OK;
914
915 error:
916 return ret;
917 }
918
919 /*
920 * Init tracing by creating trace directory and sending fds kernel consumer.
921 */
922 static int init_kernel_tracing(struct ltt_kernel_session *session)
923 {
924 int ret = 0;
925 struct lttng_ht_iter iter;
926 struct consumer_socket *socket;
927
928 assert(session);
929
930 rcu_read_lock();
931
932 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
933 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
934 socket, node.node) {
935 pthread_mutex_lock(socket->lock);
936 ret = kernel_consumer_send_session(socket, session);
937 pthread_mutex_unlock(socket->lock);
938 if (ret < 0) {
939 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
940 goto error;
941 }
942 }
943 }
944
945 error:
946 rcu_read_unlock();
947 return ret;
948 }
949
950 /*
951 * Create a socket to the relayd using the URI.
952 *
953 * On success, the relayd_sock pointer is set to the created socket.
954 * Else, it's stays untouched and a lttcomm error code is returned.
955 */
956 static int create_connect_relayd(struct lttng_uri *uri,
957 struct lttcomm_relayd_sock **relayd_sock,
958 struct consumer_output *consumer)
959 {
960 int ret;
961 struct lttcomm_relayd_sock *rsock;
962
963 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
964 RELAYD_VERSION_COMM_MINOR);
965 if (!rsock) {
966 ret = LTTNG_ERR_FATAL;
967 goto error;
968 }
969
970 /*
971 * Connect to relayd so we can proceed with a session creation. This call
972 * can possibly block for an arbitrary amount of time to set the health
973 * state to be in poll execution.
974 */
975 health_poll_entry();
976 ret = relayd_connect(rsock);
977 health_poll_exit();
978 if (ret < 0) {
979 ERR("Unable to reach lttng-relayd");
980 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
981 goto free_sock;
982 }
983
984 /* Create socket for control stream. */
985 if (uri->stype == LTTNG_STREAM_CONTROL) {
986 DBG3("Creating relayd stream socket from URI");
987
988 /* Check relayd version */
989 ret = relayd_version_check(rsock);
990 if (ret == LTTNG_ERR_RELAYD_VERSION_FAIL) {
991 goto close_sock;
992 } else if (ret < 0) {
993 ERR("Unable to reach lttng-relayd");
994 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
995 goto close_sock;
996 }
997 consumer->relay_major_version = rsock->major;
998 consumer->relay_minor_version = rsock->minor;
999 } else if (uri->stype == LTTNG_STREAM_DATA) {
1000 DBG3("Creating relayd data socket from URI");
1001 } else {
1002 /* Command is not valid */
1003 ERR("Relayd invalid stream type: %d", uri->stype);
1004 ret = LTTNG_ERR_INVALID;
1005 goto close_sock;
1006 }
1007
1008 *relayd_sock = rsock;
1009
1010 return LTTNG_OK;
1011
1012 close_sock:
1013 /* The returned value is not useful since we are on an error path. */
1014 (void) relayd_close(rsock);
1015 free_sock:
1016 free(rsock);
1017 error:
1018 return ret;
1019 }
1020
1021 /*
1022 * Connect to the relayd using URI and send the socket to the right consumer.
1023 *
1024 * The consumer socket lock must be held by the caller.
1025 */
1026 static int send_consumer_relayd_socket(unsigned int session_id,
1027 struct lttng_uri *relayd_uri,
1028 struct consumer_output *consumer,
1029 struct consumer_socket *consumer_sock,
1030 char *session_name, char *hostname, int session_live_timer)
1031 {
1032 int ret;
1033 struct lttcomm_relayd_sock *rsock = NULL;
1034
1035 /* Connect to relayd and make version check if uri is the control. */
1036 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
1037 if (ret != LTTNG_OK) {
1038 goto relayd_comm_error;
1039 }
1040 assert(rsock);
1041
1042 /* Set the network sequence index if not set. */
1043 if (consumer->net_seq_index == (uint64_t) -1ULL) {
1044 pthread_mutex_lock(&relayd_net_seq_idx_lock);
1045 /*
1046 * Increment net_seq_idx because we are about to transfer the
1047 * new relayd socket to the consumer.
1048 * Assign unique key so the consumer can match streams.
1049 */
1050 consumer->net_seq_index = ++relayd_net_seq_idx;
1051 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
1052 }
1053
1054 /* Send relayd socket to consumer. */
1055 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
1056 relayd_uri->stype, session_id,
1057 session_name, hostname, session_live_timer);
1058 if (ret < 0) {
1059 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
1060 goto close_sock;
1061 }
1062
1063 /* Flag that the corresponding socket was sent. */
1064 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
1065 consumer_sock->control_sock_sent = 1;
1066 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
1067 consumer_sock->data_sock_sent = 1;
1068 }
1069
1070 ret = LTTNG_OK;
1071
1072 /*
1073 * Close socket which was dup on the consumer side. The session daemon does
1074 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1075 */
1076
1077 close_sock:
1078 if (ret != LTTNG_OK) {
1079 /*
1080 * The consumer output for this session should not be used anymore
1081 * since the relayd connection failed thus making any tracing or/and
1082 * streaming not usable.
1083 */
1084 consumer->enabled = 0;
1085 }
1086 (void) relayd_close(rsock);
1087 free(rsock);
1088
1089 relayd_comm_error:
1090 return ret;
1091 }
1092
1093 /*
1094 * Send both relayd sockets to a specific consumer and domain. This is a
1095 * helper function to facilitate sending the information to the consumer for a
1096 * session.
1097 *
1098 * The consumer socket lock must be held by the caller.
1099 */
1100 static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
1101 unsigned int session_id, struct consumer_output *consumer,
1102 struct consumer_socket *sock, char *session_name,
1103 char *hostname, int session_live_timer)
1104 {
1105 int ret = LTTNG_OK;
1106
1107 assert(consumer);
1108 assert(sock);
1109
1110 /* Sending control relayd socket. */
1111 if (!sock->control_sock_sent) {
1112 ret = send_consumer_relayd_socket(session_id,
1113 &consumer->dst.net.control, consumer, sock,
1114 session_name, hostname, session_live_timer);
1115 if (ret != LTTNG_OK) {
1116 goto error;
1117 }
1118 }
1119
1120 /* Sending data relayd socket. */
1121 if (!sock->data_sock_sent) {
1122 ret = send_consumer_relayd_socket(session_id,
1123 &consumer->dst.net.data, consumer, sock,
1124 session_name, hostname, session_live_timer);
1125 if (ret != LTTNG_OK) {
1126 goto error;
1127 }
1128 }
1129
1130 error:
1131 return ret;
1132 }
1133
1134 /*
1135 * Setup relayd connections for a tracing session. First creates the socket to
1136 * the relayd and send them to the right domain consumer. Consumer type MUST be
1137 * network.
1138 */
1139 int cmd_setup_relayd(struct ltt_session *session)
1140 {
1141 int ret = LTTNG_OK;
1142 struct ltt_ust_session *usess;
1143 struct ltt_kernel_session *ksess;
1144 struct consumer_socket *socket;
1145 struct lttng_ht_iter iter;
1146
1147 assert(session);
1148
1149 usess = session->ust_session;
1150 ksess = session->kernel_session;
1151
1152 DBG("Setting relayd for session %s", session->name);
1153
1154 rcu_read_lock();
1155
1156 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1157 && usess->consumer->enabled) {
1158 /* For each consumer socket, send relayd sockets */
1159 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1160 socket, node.node) {
1161 pthread_mutex_lock(socket->lock);
1162 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
1163 usess->consumer, socket,
1164 session->name, session->hostname,
1165 session->live_timer);
1166 pthread_mutex_unlock(socket->lock);
1167 if (ret != LTTNG_OK) {
1168 goto error;
1169 }
1170 /* Session is now ready for network streaming. */
1171 session->net_handle = 1;
1172 }
1173 session->consumer->relay_major_version =
1174 usess->consumer->relay_major_version;
1175 session->consumer->relay_minor_version =
1176 usess->consumer->relay_minor_version;
1177 }
1178
1179 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1180 && ksess->consumer->enabled) {
1181 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1182 socket, node.node) {
1183 pthread_mutex_lock(socket->lock);
1184 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
1185 ksess->consumer, socket,
1186 session->name, session->hostname,
1187 session->live_timer);
1188 pthread_mutex_unlock(socket->lock);
1189 if (ret != LTTNG_OK) {
1190 goto error;
1191 }
1192 /* Session is now ready for network streaming. */
1193 session->net_handle = 1;
1194 }
1195 session->consumer->relay_major_version =
1196 ksess->consumer->relay_major_version;
1197 session->consumer->relay_minor_version =
1198 ksess->consumer->relay_minor_version;
1199 }
1200
1201 error:
1202 rcu_read_unlock();
1203 return ret;
1204 }
1205
1206 /*
1207 * Start a kernel session by opening all necessary streams.
1208 */
1209 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1210 {
1211 int ret;
1212 struct ltt_kernel_channel *kchan;
1213
1214 /* Open kernel metadata */
1215 if (ksess->metadata == NULL && ksess->output_traces) {
1216 ret = kernel_open_metadata(ksess);
1217 if (ret < 0) {
1218 ret = LTTNG_ERR_KERN_META_FAIL;
1219 goto error;
1220 }
1221 }
1222
1223 /* Open kernel metadata stream */
1224 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
1225 ret = kernel_open_metadata_stream(ksess);
1226 if (ret < 0) {
1227 ERR("Kernel create metadata stream failed");
1228 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1229 goto error;
1230 }
1231 }
1232
1233 /* For each channel */
1234 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1235 if (kchan->stream_count == 0) {
1236 ret = kernel_open_channel_stream(kchan);
1237 if (ret < 0) {
1238 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1239 goto error;
1240 }
1241 /* Update the stream global counter */
1242 ksess->stream_count_global += ret;
1243 }
1244 }
1245
1246 /* Setup kernel consumer socket and send fds to it */
1247 ret = init_kernel_tracing(ksess);
1248 if (ret != 0) {
1249 ret = LTTNG_ERR_KERN_START_FAIL;
1250 goto error;
1251 }
1252
1253 /* This start the kernel tracing */
1254 ret = kernel_start_session(ksess);
1255 if (ret < 0) {
1256 ret = LTTNG_ERR_KERN_START_FAIL;
1257 goto error;
1258 }
1259
1260 /* Quiescent wait after starting trace */
1261 kernel_wait_quiescent(wpipe);
1262
1263 ksess->active = 1;
1264
1265 ret = LTTNG_OK;
1266
1267 error:
1268 return ret;
1269 }
1270
1271 /*
1272 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1273 */
1274 int cmd_disable_channel(struct ltt_session *session,
1275 enum lttng_domain_type domain, char *channel_name)
1276 {
1277 int ret;
1278 struct ltt_ust_session *usess;
1279
1280 usess = session->ust_session;
1281
1282 rcu_read_lock();
1283
1284 switch (domain) {
1285 case LTTNG_DOMAIN_KERNEL:
1286 {
1287 ret = channel_kernel_disable(session->kernel_session,
1288 channel_name);
1289 if (ret != LTTNG_OK) {
1290 goto error;
1291 }
1292
1293 kernel_wait_quiescent(kernel_tracer_fd);
1294 break;
1295 }
1296 case LTTNG_DOMAIN_UST:
1297 {
1298 struct ltt_ust_channel *uchan;
1299 struct lttng_ht *chan_ht;
1300
1301 chan_ht = usess->domain_global.channels;
1302
1303 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1304 if (uchan == NULL) {
1305 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1306 goto error;
1307 }
1308
1309 ret = channel_ust_disable(usess, uchan);
1310 if (ret != LTTNG_OK) {
1311 goto error;
1312 }
1313 break;
1314 }
1315 default:
1316 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1317 goto error;
1318 }
1319
1320 ret = LTTNG_OK;
1321
1322 error:
1323 rcu_read_unlock();
1324 return ret;
1325 }
1326
1327 /*
1328 * Command LTTNG_TRACK_PID processed by the client thread.
1329 *
1330 * Called with session lock held.
1331 */
1332 int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1333 int pid)
1334 {
1335 int ret;
1336
1337 rcu_read_lock();
1338
1339 switch (domain) {
1340 case LTTNG_DOMAIN_KERNEL:
1341 {
1342 struct ltt_kernel_session *ksess;
1343
1344 ksess = session->kernel_session;
1345
1346 ret = kernel_track_pid(ksess, pid);
1347 if (ret != LTTNG_OK) {
1348 goto error;
1349 }
1350
1351 kernel_wait_quiescent(kernel_tracer_fd);
1352 break;
1353 }
1354 case LTTNG_DOMAIN_UST:
1355 {
1356 struct ltt_ust_session *usess;
1357
1358 usess = session->ust_session;
1359
1360 ret = trace_ust_track_pid(usess, pid);
1361 if (ret != LTTNG_OK) {
1362 goto error;
1363 }
1364 break;
1365 }
1366 default:
1367 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1368 goto error;
1369 }
1370
1371 ret = LTTNG_OK;
1372
1373 error:
1374 rcu_read_unlock();
1375 return ret;
1376 }
1377
1378 /*
1379 * Command LTTNG_UNTRACK_PID processed by the client thread.
1380 *
1381 * Called with session lock held.
1382 */
1383 int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1384 int pid)
1385 {
1386 int ret;
1387
1388 rcu_read_lock();
1389
1390 switch (domain) {
1391 case LTTNG_DOMAIN_KERNEL:
1392 {
1393 struct ltt_kernel_session *ksess;
1394
1395 ksess = session->kernel_session;
1396
1397 ret = kernel_untrack_pid(ksess, pid);
1398 if (ret != LTTNG_OK) {
1399 goto error;
1400 }
1401
1402 kernel_wait_quiescent(kernel_tracer_fd);
1403 break;
1404 }
1405 case LTTNG_DOMAIN_UST:
1406 {
1407 struct ltt_ust_session *usess;
1408
1409 usess = session->ust_session;
1410
1411 ret = trace_ust_untrack_pid(usess, pid);
1412 if (ret != LTTNG_OK) {
1413 goto error;
1414 }
1415 break;
1416 }
1417 default:
1418 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1419 goto error;
1420 }
1421
1422 ret = LTTNG_OK;
1423
1424 error:
1425 rcu_read_unlock();
1426 return ret;
1427 }
1428
1429 /*
1430 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1431 *
1432 * The wpipe arguments is used as a notifier for the kernel thread.
1433 */
1434 int cmd_enable_channel(struct ltt_session *session,
1435 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
1436 {
1437 int ret;
1438 struct ltt_ust_session *usess = session->ust_session;
1439 struct lttng_ht *chan_ht;
1440 size_t len;
1441
1442 assert(session);
1443 assert(attr);
1444 assert(domain);
1445
1446 len = lttng_strnlen(attr->name, sizeof(attr->name));
1447
1448 /* Validate channel name */
1449 if (attr->name[0] == '.' ||
1450 memchr(attr->name, '/', len) != NULL) {
1451 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1452 goto end;
1453 }
1454
1455 DBG("Enabling channel %s for session %s", attr->name, session->name);
1456
1457 rcu_read_lock();
1458
1459 /*
1460 * Don't try to enable a channel if the session has been started at
1461 * some point in time before. The tracer does not allow it.
1462 */
1463 if (session->has_been_started) {
1464 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1465 goto error;
1466 }
1467
1468 /*
1469 * If the session is a live session, remove the switch timer, the
1470 * live timer does the same thing but sends also synchronisation
1471 * beacons for inactive streams.
1472 */
1473 if (session->live_timer > 0) {
1474 attr->attr.live_timer_interval = session->live_timer;
1475 attr->attr.switch_timer_interval = 0;
1476 }
1477
1478 /* Check for feature support */
1479 switch (domain->type) {
1480 case LTTNG_DOMAIN_KERNEL:
1481 {
1482 if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd) != 1) {
1483 /* Sampling position of buffer is not supported */
1484 WARN("Kernel tracer does not support buffer monitoring. "
1485 "Setting the monitor interval timer to 0 "
1486 "(disabled) for channel '%s' of session '%s'",
1487 attr-> name, session->name);
1488 lttng_channel_set_monitor_timer_interval(attr, 0);
1489 }
1490 break;
1491 }
1492 case LTTNG_DOMAIN_UST:
1493 break;
1494 case LTTNG_DOMAIN_JUL:
1495 case LTTNG_DOMAIN_LOG4J:
1496 case LTTNG_DOMAIN_PYTHON:
1497 if (!agent_tracing_is_enabled()) {
1498 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1499 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
1500 goto error;
1501 }
1502 break;
1503 default:
1504 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1505 goto error;
1506 }
1507
1508 switch (domain->type) {
1509 case LTTNG_DOMAIN_KERNEL:
1510 {
1511 struct ltt_kernel_channel *kchan;
1512
1513 kchan = trace_kernel_get_channel_by_name(attr->name,
1514 session->kernel_session);
1515 if (kchan == NULL) {
1516 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
1517 if (attr->name[0] != '\0') {
1518 session->kernel_session->has_non_default_channel = 1;
1519 }
1520 } else {
1521 ret = channel_kernel_enable(session->kernel_session, kchan);
1522 }
1523
1524 if (ret != LTTNG_OK) {
1525 goto error;
1526 }
1527
1528 kernel_wait_quiescent(kernel_tracer_fd);
1529 break;
1530 }
1531 case LTTNG_DOMAIN_UST:
1532 case LTTNG_DOMAIN_JUL:
1533 case LTTNG_DOMAIN_LOG4J:
1534 case LTTNG_DOMAIN_PYTHON:
1535 {
1536 struct ltt_ust_channel *uchan;
1537
1538 /*
1539 * FIXME
1540 *
1541 * Current agent implementation limitations force us to allow
1542 * only one channel at once in "agent" subdomains. Each
1543 * subdomain has a default channel name which must be strictly
1544 * adhered to.
1545 */
1546 if (domain->type == LTTNG_DOMAIN_JUL) {
1547 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1548 LTTNG_SYMBOL_NAME_LEN)) {
1549 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1550 goto error;
1551 }
1552 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1553 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1554 LTTNG_SYMBOL_NAME_LEN)) {
1555 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1556 goto error;
1557 }
1558 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1559 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1560 LTTNG_SYMBOL_NAME_LEN)) {
1561 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1562 goto error;
1563 }
1564 }
1565
1566 chan_ht = usess->domain_global.channels;
1567
1568 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1569 if (uchan == NULL) {
1570 ret = channel_ust_create(usess, attr, domain->buf_type);
1571 if (attr->name[0] != '\0') {
1572 usess->has_non_default_channel = 1;
1573 }
1574 } else {
1575 ret = channel_ust_enable(usess, uchan);
1576 }
1577 break;
1578 }
1579 default:
1580 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1581 goto error;
1582 }
1583
1584 error:
1585 rcu_read_unlock();
1586 end:
1587 return ret;
1588 }
1589
1590 /*
1591 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1592 */
1593 int cmd_disable_event(struct ltt_session *session,
1594 enum lttng_domain_type domain, char *channel_name,
1595 struct lttng_event *event)
1596 {
1597 int ret;
1598 char *event_name;
1599
1600 DBG("Disable event command for event \'%s\'", event->name);
1601
1602 event_name = event->name;
1603
1604 /* Error out on unhandled search criteria */
1605 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1606 || event->pid || event->filter || event->exclusion) {
1607 ret = LTTNG_ERR_UNK;
1608 goto error;
1609 }
1610
1611 rcu_read_lock();
1612
1613 switch (domain) {
1614 case LTTNG_DOMAIN_KERNEL:
1615 {
1616 struct ltt_kernel_channel *kchan;
1617 struct ltt_kernel_session *ksess;
1618
1619 ksess = session->kernel_session;
1620
1621 /*
1622 * If a non-default channel has been created in the
1623 * session, explicitely require that -c chan_name needs
1624 * to be provided.
1625 */
1626 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1627 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1628 goto error_unlock;
1629 }
1630
1631 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1632 if (kchan == NULL) {
1633 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1634 goto error_unlock;
1635 }
1636
1637 switch (event->type) {
1638 case LTTNG_EVENT_ALL:
1639 case LTTNG_EVENT_TRACEPOINT:
1640 case LTTNG_EVENT_SYSCALL:
1641 case LTTNG_EVENT_PROBE:
1642 case LTTNG_EVENT_FUNCTION:
1643 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1644 if (event_name[0] == '\0') {
1645 ret = event_kernel_disable_event(kchan,
1646 NULL, event->type);
1647 } else {
1648 ret = event_kernel_disable_event(kchan,
1649 event_name, event->type);
1650 }
1651 if (ret != LTTNG_OK) {
1652 goto error_unlock;
1653 }
1654 break;
1655 default:
1656 ret = LTTNG_ERR_UNK;
1657 goto error_unlock;
1658 }
1659
1660 kernel_wait_quiescent(kernel_tracer_fd);
1661 break;
1662 }
1663 case LTTNG_DOMAIN_UST:
1664 {
1665 struct ltt_ust_channel *uchan;
1666 struct ltt_ust_session *usess;
1667
1668 usess = session->ust_session;
1669
1670 if (validate_ust_event_name(event_name)) {
1671 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1672 goto error_unlock;
1673 }
1674
1675 /*
1676 * If a non-default channel has been created in the
1677 * session, explicitly require that -c chan_name needs
1678 * to be provided.
1679 */
1680 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1681 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1682 goto error_unlock;
1683 }
1684
1685 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1686 channel_name);
1687 if (uchan == NULL) {
1688 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1689 goto error_unlock;
1690 }
1691
1692 switch (event->type) {
1693 case LTTNG_EVENT_ALL:
1694 /*
1695 * An empty event name means that everything
1696 * should be disabled.
1697 */
1698 if (event->name[0] == '\0') {
1699 ret = event_ust_disable_all_tracepoints(usess, uchan);
1700 } else {
1701 ret = event_ust_disable_tracepoint(usess, uchan,
1702 event_name);
1703 }
1704 if (ret != LTTNG_OK) {
1705 goto error_unlock;
1706 }
1707 break;
1708 default:
1709 ret = LTTNG_ERR_UNK;
1710 goto error_unlock;
1711 }
1712
1713 DBG3("Disable UST event %s in channel %s completed", event_name,
1714 channel_name);
1715 break;
1716 }
1717 case LTTNG_DOMAIN_LOG4J:
1718 case LTTNG_DOMAIN_JUL:
1719 case LTTNG_DOMAIN_PYTHON:
1720 {
1721 struct agent *agt;
1722 struct ltt_ust_session *usess = session->ust_session;
1723
1724 assert(usess);
1725
1726 switch (event->type) {
1727 case LTTNG_EVENT_ALL:
1728 break;
1729 default:
1730 ret = LTTNG_ERR_UNK;
1731 goto error_unlock;
1732 }
1733
1734 agt = trace_ust_find_agent(usess, domain);
1735 if (!agt) {
1736 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1737 goto error_unlock;
1738 }
1739 /*
1740 * An empty event name means that everything
1741 * should be disabled.
1742 */
1743 if (event->name[0] == '\0') {
1744 ret = event_agent_disable_all(usess, agt);
1745 } else {
1746 ret = event_agent_disable(usess, agt, event_name);
1747 }
1748 if (ret != LTTNG_OK) {
1749 goto error_unlock;
1750 }
1751
1752 break;
1753 }
1754 default:
1755 ret = LTTNG_ERR_UND;
1756 goto error_unlock;
1757 }
1758
1759 ret = LTTNG_OK;
1760
1761 error_unlock:
1762 rcu_read_unlock();
1763 error:
1764 return ret;
1765 }
1766
1767 /*
1768 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1769 */
1770 int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
1771 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1772 {
1773 int ret, chan_kern_created = 0, chan_ust_created = 0;
1774 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1775
1776 /*
1777 * Don't try to add a context if the session has been started at
1778 * some point in time before. The tracer does not allow it and would
1779 * result in a corrupted trace.
1780 */
1781 if (session->has_been_started) {
1782 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1783 goto end;
1784 }
1785
1786 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1787 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1788 app_ctx_name = ctx->u.app_ctx.ctx_name;
1789 }
1790
1791 switch (domain) {
1792 case LTTNG_DOMAIN_KERNEL:
1793 assert(session->kernel_session);
1794
1795 if (session->kernel_session->channel_count == 0) {
1796 /* Create default channel */
1797 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1798 if (ret != LTTNG_OK) {
1799 goto error;
1800 }
1801 chan_kern_created = 1;
1802 }
1803 /* Add kernel context to kernel tracer */
1804 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1805 if (ret != LTTNG_OK) {
1806 goto error;
1807 }
1808 break;
1809 case LTTNG_DOMAIN_JUL:
1810 case LTTNG_DOMAIN_LOG4J:
1811 {
1812 /*
1813 * Validate channel name.
1814 * If no channel name is given and the domain is JUL or LOG4J,
1815 * set it to the appropriate domain-specific channel name. If
1816 * a name is provided but does not match the expexted channel
1817 * name, return an error.
1818 */
1819 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1820 strcmp(channel_name,
1821 DEFAULT_JUL_CHANNEL_NAME)) {
1822 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1823 goto error;
1824 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1825 strcmp(channel_name,
1826 DEFAULT_LOG4J_CHANNEL_NAME)) {
1827 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1828 goto error;
1829 }
1830 /* break is _not_ missing here. */
1831 }
1832 case LTTNG_DOMAIN_UST:
1833 {
1834 struct ltt_ust_session *usess = session->ust_session;
1835 unsigned int chan_count;
1836
1837 assert(usess);
1838
1839 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1840 if (chan_count == 0) {
1841 struct lttng_channel *attr;
1842 /* Create default channel */
1843 attr = channel_new_default_attr(domain, usess->buffer_type);
1844 if (attr == NULL) {
1845 ret = LTTNG_ERR_FATAL;
1846 goto error;
1847 }
1848
1849 ret = channel_ust_create(usess, attr, usess->buffer_type);
1850 if (ret != LTTNG_OK) {
1851 free(attr);
1852 goto error;
1853 }
1854 channel_attr_destroy(attr);
1855 chan_ust_created = 1;
1856 }
1857
1858 ret = context_ust_add(usess, domain, ctx, channel_name);
1859 free(app_ctx_provider_name);
1860 free(app_ctx_name);
1861 app_ctx_name = NULL;
1862 app_ctx_provider_name = NULL;
1863 if (ret != LTTNG_OK) {
1864 goto error;
1865 }
1866 break;
1867 }
1868 default:
1869 ret = LTTNG_ERR_UND;
1870 goto error;
1871 }
1872
1873 ret = LTTNG_OK;
1874 goto end;
1875
1876 error:
1877 if (chan_kern_created) {
1878 struct ltt_kernel_channel *kchan =
1879 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1880 session->kernel_session);
1881 /* Created previously, this should NOT fail. */
1882 assert(kchan);
1883 kernel_destroy_channel(kchan);
1884 }
1885
1886 if (chan_ust_created) {
1887 struct ltt_ust_channel *uchan =
1888 trace_ust_find_channel_by_name(
1889 session->ust_session->domain_global.channels,
1890 DEFAULT_CHANNEL_NAME);
1891 /* Created previously, this should NOT fail. */
1892 assert(uchan);
1893 /* Remove from the channel list of the session. */
1894 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1895 uchan);
1896 trace_ust_destroy_channel(uchan);
1897 }
1898 end:
1899 free(app_ctx_provider_name);
1900 free(app_ctx_name);
1901 return ret;
1902 }
1903
1904 static inline bool name_starts_with(const char *name, const char *prefix)
1905 {
1906 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1907
1908 return !strncmp(name, prefix, max_cmp_len);
1909 }
1910
1911 /* Perform userspace-specific event name validation */
1912 static int validate_ust_event_name(const char *name)
1913 {
1914 int ret = 0;
1915
1916 if (!name) {
1917 ret = -1;
1918 goto end;
1919 }
1920
1921 /*
1922 * Check name against all internal UST event component namespaces used
1923 * by the agents.
1924 */
1925 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1926 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1927 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1928 ret = -1;
1929 }
1930
1931 end:
1932 return ret;
1933 }
1934
1935 /*
1936 * Internal version of cmd_enable_event() with a supplemental
1937 * "internal_event" flag which is used to enable internal events which should
1938 * be hidden from clients. Such events are used in the agent implementation to
1939 * enable the events through which all "agent" events are funeled.
1940 */
1941 static int _cmd_enable_event(struct ltt_session *session,
1942 struct lttng_domain *domain,
1943 char *channel_name, struct lttng_event *event,
1944 char *filter_expression,
1945 struct lttng_filter_bytecode *filter,
1946 struct lttng_event_exclusion *exclusion,
1947 int wpipe, bool internal_event)
1948 {
1949 int ret = 0, channel_created = 0;
1950 struct lttng_channel *attr = NULL;
1951
1952 assert(session);
1953 assert(event);
1954 assert(channel_name);
1955
1956 /* If we have a filter, we must have its filter expression */
1957 assert(!(!!filter_expression ^ !!filter));
1958
1959 /* Normalize event name as a globbing pattern */
1960 strutils_normalize_star_glob_pattern(event->name);
1961
1962 /* Normalize exclusion names as globbing patterns */
1963 if (exclusion) {
1964 size_t i;
1965
1966 for (i = 0; i < exclusion->count; i++) {
1967 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
1968
1969 strutils_normalize_star_glob_pattern(name);
1970 }
1971 }
1972
1973 DBG("Enable event command for event \'%s\'", event->name);
1974
1975 rcu_read_lock();
1976
1977 switch (domain->type) {
1978 case LTTNG_DOMAIN_KERNEL:
1979 {
1980 struct ltt_kernel_channel *kchan;
1981
1982 /*
1983 * If a non-default channel has been created in the
1984 * session, explicitely require that -c chan_name needs
1985 * to be provided.
1986 */
1987 if (session->kernel_session->has_non_default_channel
1988 && channel_name[0] == '\0') {
1989 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1990 goto error;
1991 }
1992
1993 kchan = trace_kernel_get_channel_by_name(channel_name,
1994 session->kernel_session);
1995 if (kchan == NULL) {
1996 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1997 LTTNG_BUFFER_GLOBAL);
1998 if (attr == NULL) {
1999 ret = LTTNG_ERR_FATAL;
2000 goto error;
2001 }
2002 if (lttng_strncpy(attr->name, channel_name,
2003 sizeof(attr->name))) {
2004 ret = LTTNG_ERR_INVALID;
2005 goto error;
2006 }
2007
2008 ret = cmd_enable_channel(session, domain, attr, wpipe);
2009 if (ret != LTTNG_OK) {
2010 goto error;
2011 }
2012 channel_created = 1;
2013 }
2014
2015 /* Get the newly created kernel channel pointer */
2016 kchan = trace_kernel_get_channel_by_name(channel_name,
2017 session->kernel_session);
2018 if (kchan == NULL) {
2019 /* This sould not happen... */
2020 ret = LTTNG_ERR_FATAL;
2021 goto error;
2022 }
2023
2024 switch (event->type) {
2025 case LTTNG_EVENT_ALL:
2026 {
2027 char *filter_expression_a = NULL;
2028 struct lttng_filter_bytecode *filter_a = NULL;
2029
2030 /*
2031 * We need to duplicate filter_expression and filter,
2032 * because ownership is passed to first enable
2033 * event.
2034 */
2035 if (filter_expression) {
2036 filter_expression_a = strdup(filter_expression);
2037 if (!filter_expression_a) {
2038 ret = LTTNG_ERR_FATAL;
2039 goto error;
2040 }
2041 }
2042 if (filter) {
2043 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
2044 if (!filter_a) {
2045 free(filter_expression_a);
2046 ret = LTTNG_ERR_FATAL;
2047 goto error;
2048 }
2049 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
2050 }
2051 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
2052 ret = event_kernel_enable_event(kchan, event,
2053 filter_expression, filter);
2054 /* We have passed ownership */
2055 filter_expression = NULL;
2056 filter = NULL;
2057 if (ret != LTTNG_OK) {
2058 if (channel_created) {
2059 /* Let's not leak a useless channel. */
2060 kernel_destroy_channel(kchan);
2061 }
2062 free(filter_expression_a);
2063 free(filter_a);
2064 goto error;
2065 }
2066 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
2067 ret = event_kernel_enable_event(kchan, event,
2068 filter_expression_a, filter_a);
2069 /* We have passed ownership */
2070 filter_expression_a = NULL;
2071 filter_a = NULL;
2072 if (ret != LTTNG_OK) {
2073 goto error;
2074 }
2075 break;
2076 }
2077 case LTTNG_EVENT_PROBE:
2078 case LTTNG_EVENT_USERSPACE_PROBE:
2079 case LTTNG_EVENT_FUNCTION:
2080 case LTTNG_EVENT_FUNCTION_ENTRY:
2081 case LTTNG_EVENT_TRACEPOINT:
2082 ret = event_kernel_enable_event(kchan, event,
2083 filter_expression, filter);
2084 /* We have passed ownership */
2085 filter_expression = NULL;
2086 filter = NULL;
2087 if (ret != LTTNG_OK) {
2088 if (channel_created) {
2089 /* Let's not leak a useless channel. */
2090 kernel_destroy_channel(kchan);
2091 }
2092 goto error;
2093 }
2094 break;
2095 case LTTNG_EVENT_SYSCALL:
2096 ret = event_kernel_enable_event(kchan, event,
2097 filter_expression, filter);
2098 /* We have passed ownership */
2099 filter_expression = NULL;
2100 filter = NULL;
2101 if (ret != LTTNG_OK) {
2102 goto error;
2103 }
2104 break;
2105 default:
2106 ret = LTTNG_ERR_UNK;
2107 goto error;
2108 }
2109
2110 kernel_wait_quiescent(kernel_tracer_fd);
2111 break;
2112 }
2113 case LTTNG_DOMAIN_UST:
2114 {
2115 struct ltt_ust_channel *uchan;
2116 struct ltt_ust_session *usess = session->ust_session;
2117
2118 assert(usess);
2119
2120 /*
2121 * If a non-default channel has been created in the
2122 * session, explicitely require that -c chan_name needs
2123 * to be provided.
2124 */
2125 if (usess->has_non_default_channel && channel_name[0] == '\0') {
2126 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
2127 goto error;
2128 }
2129
2130 /* Get channel from global UST domain */
2131 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2132 channel_name);
2133 if (uchan == NULL) {
2134 /* Create default channel */
2135 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
2136 usess->buffer_type);
2137 if (attr == NULL) {
2138 ret = LTTNG_ERR_FATAL;
2139 goto error;
2140 }
2141 if (lttng_strncpy(attr->name, channel_name,
2142 sizeof(attr->name))) {
2143 ret = LTTNG_ERR_INVALID;
2144 goto error;
2145 }
2146
2147 ret = cmd_enable_channel(session, domain, attr, wpipe);
2148 if (ret != LTTNG_OK) {
2149 goto error;
2150 }
2151
2152 /* Get the newly created channel reference back */
2153 uchan = trace_ust_find_channel_by_name(
2154 usess->domain_global.channels, channel_name);
2155 assert(uchan);
2156 }
2157
2158 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2159 /*
2160 * Don't allow users to add UST events to channels which
2161 * are assigned to a userspace subdomain (JUL, Log4J,
2162 * Python, etc.).
2163 */
2164 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2165 goto error;
2166 }
2167
2168 if (!internal_event) {
2169 /*
2170 * Ensure the event name is not reserved for internal
2171 * use.
2172 */
2173 ret = validate_ust_event_name(event->name);
2174 if (ret) {
2175 WARN("Userspace event name %s failed validation.",
2176 event->name);
2177 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2178 goto error;
2179 }
2180 }
2181
2182 /* At this point, the session and channel exist on the tracer */
2183 ret = event_ust_enable_tracepoint(usess, uchan, event,
2184 filter_expression, filter, exclusion,
2185 internal_event);
2186 /* We have passed ownership */
2187 filter_expression = NULL;
2188 filter = NULL;
2189 exclusion = NULL;
2190 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2191 goto already_enabled;
2192 } else if (ret != LTTNG_OK) {
2193 goto error;
2194 }
2195 break;
2196 }
2197 case LTTNG_DOMAIN_LOG4J:
2198 case LTTNG_DOMAIN_JUL:
2199 case LTTNG_DOMAIN_PYTHON:
2200 {
2201 const char *default_event_name, *default_chan_name;
2202 struct agent *agt;
2203 struct lttng_event uevent;
2204 struct lttng_domain tmp_dom;
2205 struct ltt_ust_session *usess = session->ust_session;
2206
2207 assert(usess);
2208
2209 if (!agent_tracing_is_enabled()) {
2210 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2211 ret = LTTNG_ERR_AGENT_TRACING_DISABLED;
2212 goto error;
2213 }
2214
2215 agt = trace_ust_find_agent(usess, domain->type);
2216 if (!agt) {
2217 agt = agent_create(domain->type);
2218 if (!agt) {
2219 ret = LTTNG_ERR_NOMEM;
2220 goto error;
2221 }
2222 agent_add(agt, usess->agents);
2223 }
2224
2225 /* Create the default tracepoint. */
2226 memset(&uevent, 0, sizeof(uevent));
2227 uevent.type = LTTNG_EVENT_TRACEPOINT;
2228 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2229 default_event_name = event_get_default_agent_ust_name(
2230 domain->type);
2231 if (!default_event_name) {
2232 ret = LTTNG_ERR_FATAL;
2233 goto error;
2234 }
2235 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
2236 uevent.name[sizeof(uevent.name) - 1] = '\0';
2237
2238 /*
2239 * The domain type is changed because we are about to enable the
2240 * default channel and event for the JUL domain that are hardcoded.
2241 * This happens in the UST domain.
2242 */
2243 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2244 tmp_dom.type = LTTNG_DOMAIN_UST;
2245
2246 switch (domain->type) {
2247 case LTTNG_DOMAIN_LOG4J:
2248 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
2249 break;
2250 case LTTNG_DOMAIN_JUL:
2251 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
2252 break;
2253 case LTTNG_DOMAIN_PYTHON:
2254 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2255 break;
2256 default:
2257 /* The switch/case we are in makes this impossible */
2258 assert(0);
2259 }
2260
2261 {
2262 char *filter_expression_copy = NULL;
2263 struct lttng_filter_bytecode *filter_copy = NULL;
2264
2265 if (filter) {
2266 const size_t filter_size = sizeof(
2267 struct lttng_filter_bytecode)
2268 + filter->len;
2269
2270 filter_copy = zmalloc(filter_size);
2271 if (!filter_copy) {
2272 ret = LTTNG_ERR_NOMEM;
2273 goto error;
2274 }
2275 memcpy(filter_copy, filter, filter_size);
2276
2277 filter_expression_copy =
2278 strdup(filter_expression);
2279 if (!filter_expression) {
2280 ret = LTTNG_ERR_NOMEM;
2281 }
2282
2283 if (!filter_expression_copy || !filter_copy) {
2284 free(filter_expression_copy);
2285 free(filter_copy);
2286 goto error;
2287 }
2288 }
2289
2290 ret = cmd_enable_event_internal(session, &tmp_dom,
2291 (char *) default_chan_name,
2292 &uevent, filter_expression_copy,
2293 filter_copy, NULL, wpipe);
2294 }
2295
2296 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2297 goto already_enabled;
2298 } else if (ret != LTTNG_OK) {
2299 goto error;
2300 }
2301
2302 /* The wild card * means that everything should be enabled. */
2303 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
2304 ret = event_agent_enable_all(usess, agt, event, filter,
2305 filter_expression);
2306 } else {
2307 ret = event_agent_enable(usess, agt, event, filter,
2308 filter_expression);
2309 }
2310 filter = NULL;
2311 filter_expression = NULL;
2312 if (ret != LTTNG_OK) {
2313 goto error;
2314 }
2315
2316 break;
2317 }
2318 default:
2319 ret = LTTNG_ERR_UND;
2320 goto error;
2321 }
2322
2323 ret = LTTNG_OK;
2324
2325 already_enabled:
2326 error:
2327 free(filter_expression);
2328 free(filter);
2329 free(exclusion);
2330 channel_attr_destroy(attr);
2331 rcu_read_unlock();
2332 return ret;
2333 }
2334
2335 /*
2336 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2337 * We own filter, exclusion, and filter_expression.
2338 */
2339 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2340 char *channel_name, struct lttng_event *event,
2341 char *filter_expression,
2342 struct lttng_filter_bytecode *filter,
2343 struct lttng_event_exclusion *exclusion,
2344 int wpipe)
2345 {
2346 return _cmd_enable_event(session, domain, channel_name, event,
2347 filter_expression, filter, exclusion, wpipe, false);
2348 }
2349
2350 /*
2351 * Enable an event which is internal to LTTng. An internal should
2352 * never be made visible to clients and are immune to checks such as
2353 * reserved names.
2354 */
2355 static int cmd_enable_event_internal(struct ltt_session *session,
2356 struct lttng_domain *domain,
2357 char *channel_name, struct lttng_event *event,
2358 char *filter_expression,
2359 struct lttng_filter_bytecode *filter,
2360 struct lttng_event_exclusion *exclusion,
2361 int wpipe)
2362 {
2363 return _cmd_enable_event(session, domain, channel_name, event,
2364 filter_expression, filter, exclusion, wpipe, true);
2365 }
2366
2367 /*
2368 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2369 */
2370 ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2371 struct lttng_event **events)
2372 {
2373 int ret;
2374 ssize_t nb_events = 0;
2375
2376 switch (domain) {
2377 case LTTNG_DOMAIN_KERNEL:
2378 nb_events = kernel_list_events(kernel_tracer_fd, events);
2379 if (nb_events < 0) {
2380 ret = LTTNG_ERR_KERN_LIST_FAIL;
2381 goto error;
2382 }
2383 break;
2384 case LTTNG_DOMAIN_UST:
2385 nb_events = ust_app_list_events(events);
2386 if (nb_events < 0) {
2387 ret = LTTNG_ERR_UST_LIST_FAIL;
2388 goto error;
2389 }
2390 break;
2391 case LTTNG_DOMAIN_LOG4J:
2392 case LTTNG_DOMAIN_JUL:
2393 case LTTNG_DOMAIN_PYTHON:
2394 nb_events = agent_list_events(events, domain);
2395 if (nb_events < 0) {
2396 ret = LTTNG_ERR_UST_LIST_FAIL;
2397 goto error;
2398 }
2399 break;
2400 default:
2401 ret = LTTNG_ERR_UND;
2402 goto error;
2403 }
2404
2405 return nb_events;
2406
2407 error:
2408 /* Return negative value to differentiate return code */
2409 return -ret;
2410 }
2411
2412 /*
2413 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2414 */
2415 ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2416 struct lttng_event_field **fields)
2417 {
2418 int ret;
2419 ssize_t nb_fields = 0;
2420
2421 switch (domain) {
2422 case LTTNG_DOMAIN_UST:
2423 nb_fields = ust_app_list_event_fields(fields);
2424 if (nb_fields < 0) {
2425 ret = LTTNG_ERR_UST_LIST_FAIL;
2426 goto error;
2427 }
2428 break;
2429 case LTTNG_DOMAIN_KERNEL:
2430 default: /* fall-through */
2431 ret = LTTNG_ERR_UND;
2432 goto error;
2433 }
2434
2435 return nb_fields;
2436
2437 error:
2438 /* Return negative value to differentiate return code */
2439 return -ret;
2440 }
2441
2442 ssize_t cmd_list_syscalls(struct lttng_event **events)
2443 {
2444 return syscall_table_list(events);
2445 }
2446
2447 /*
2448 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2449 *
2450 * Called with session lock held.
2451 */
2452 ssize_t cmd_list_tracker_pids(struct ltt_session *session,
2453 enum lttng_domain_type domain, int32_t **pids)
2454 {
2455 int ret;
2456 ssize_t nr_pids = 0;
2457
2458 switch (domain) {
2459 case LTTNG_DOMAIN_KERNEL:
2460 {
2461 struct ltt_kernel_session *ksess;
2462
2463 ksess = session->kernel_session;
2464 nr_pids = kernel_list_tracker_pids(ksess, pids);
2465 if (nr_pids < 0) {
2466 ret = LTTNG_ERR_KERN_LIST_FAIL;
2467 goto error;
2468 }
2469 break;
2470 }
2471 case LTTNG_DOMAIN_UST:
2472 {
2473 struct ltt_ust_session *usess;
2474
2475 usess = session->ust_session;
2476 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2477 if (nr_pids < 0) {
2478 ret = LTTNG_ERR_UST_LIST_FAIL;
2479 goto error;
2480 }
2481 break;
2482 }
2483 case LTTNG_DOMAIN_LOG4J:
2484 case LTTNG_DOMAIN_JUL:
2485 case LTTNG_DOMAIN_PYTHON:
2486 default:
2487 ret = LTTNG_ERR_UND;
2488 goto error;
2489 }
2490
2491 return nr_pids;
2492
2493 error:
2494 /* Return negative value to differentiate return code */
2495 return -ret;
2496 }
2497
2498 static
2499 int domain_mkdir(const struct consumer_output *output,
2500 const struct ltt_session *session,
2501 uid_t uid, gid_t gid)
2502 {
2503 struct consumer_socket *socket;
2504 struct lttng_ht_iter iter;
2505 int ret;
2506 char *path = NULL;
2507
2508 if (!output || !output->socks) {
2509 ERR("No consumer output found");
2510 ret = -1;
2511 goto end;
2512 }
2513
2514 path = zmalloc(LTTNG_PATH_MAX * sizeof(char));
2515 if (!path) {
2516 ERR("Cannot allocate mkdir path");
2517 ret = -1;
2518 goto end;
2519 }
2520
2521 ret = snprintf(path, LTTNG_PATH_MAX, "%s%s%s",
2522 session_get_base_path(session),
2523 output->chunk_path, output->subdir);
2524 if (ret < 0 || ret >= LTTNG_PATH_MAX) {
2525 ERR("Format path");
2526 ret = -1;
2527 goto end;
2528 }
2529
2530 DBG("Domain mkdir %s for session %" PRIu64, path, session->id);
2531 rcu_read_lock();
2532 /*
2533 * We have to iterate to find a socket, but we only need to send the
2534 * rename command to one consumer, so we break after the first one.
2535 */
2536 cds_lfht_for_each_entry(output->socks->ht, &iter.iter, socket, node.node) {
2537 pthread_mutex_lock(socket->lock);
2538 ret = consumer_mkdir(socket, session->id, output, path, uid, gid);
2539 pthread_mutex_unlock(socket->lock);
2540 if (ret) {
2541 ERR("Consumer mkdir");
2542 ret = -1;
2543 goto end_unlock;
2544 }
2545 break;
2546 }
2547
2548 ret = 0;
2549
2550 end_unlock:
2551 rcu_read_unlock();
2552 end:
2553 free(path);
2554 return ret;
2555 }
2556
2557 static
2558 int session_mkdir(const struct ltt_session *session)
2559 {
2560 int ret;
2561 struct consumer_output *output;
2562 uid_t uid;
2563 gid_t gid;
2564
2565 /*
2566 * Unsupported feature in lttng-relayd before 2.11, not an error since it
2567 * is only needed for session rotation and the user will get an error
2568 * on rotate.
2569 */
2570 if (session->consumer->type == CONSUMER_DST_NET &&
2571 session->consumer->relay_major_version == 2 &&
2572 session->consumer->relay_minor_version < 11) {
2573 ret = 0;
2574 goto end;
2575 }
2576
2577 if (session->kernel_session) {
2578 output = session->kernel_session->consumer;
2579 uid = session->kernel_session->uid;
2580 gid = session->kernel_session->gid;
2581 ret = domain_mkdir(output, session, uid, gid);
2582 if (ret) {
2583 ERR("Mkdir kernel");
2584 goto end;
2585 }
2586 }
2587
2588 if (session->ust_session) {
2589 output = session->ust_session->consumer;
2590 uid = session->ust_session->uid;
2591 gid = session->ust_session->gid;
2592 ret = domain_mkdir(output, session, uid, gid);
2593 if (ret) {
2594 ERR("Mkdir UST");
2595 goto end;
2596 }
2597 }
2598
2599 ret = 0;
2600
2601 end:
2602 return ret;
2603 }
2604
2605 /*
2606 * Command LTTNG_START_TRACE processed by the client thread.
2607 *
2608 * Called with session mutex held.
2609 */
2610 int cmd_start_trace(struct ltt_session *session)
2611 {
2612 int ret;
2613 unsigned long nb_chan = 0;
2614 struct ltt_kernel_session *ksession;
2615 struct ltt_ust_session *usess;
2616
2617 assert(session);
2618
2619 /* Ease our life a bit ;) */
2620 ksession = session->kernel_session;
2621 usess = session->ust_session;
2622
2623 /* Is the session already started? */
2624 if (session->active) {
2625 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2626 goto error;
2627 }
2628
2629 /*
2630 * Starting a session without channel is useless since after that it's not
2631 * possible to enable channel thus inform the client.
2632 */
2633 if (usess && usess->domain_global.channels) {
2634 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2635 }
2636 if (ksession) {
2637 nb_chan += ksession->channel_count;
2638 }
2639 if (!nb_chan) {
2640 ret = LTTNG_ERR_NO_CHANNEL;
2641 goto error;
2642 }
2643
2644 /*
2645 * Record the timestamp of the first time the session is started for
2646 * an eventual session rotation call.
2647 */
2648 if (!session->has_been_started) {
2649 session->current_chunk_start_ts = time(NULL);
2650 if (session->current_chunk_start_ts == (time_t) -1) {
2651 PERROR("Failed to retrieve the \"%s\" session's start time",
2652 session->name);
2653 ret = LTTNG_ERR_FATAL;
2654 goto error;
2655 }
2656 if (!session->snapshot_mode && session->output_traces) {
2657 ret = session_mkdir(session);
2658 if (ret) {
2659 ERR("Failed to create the session directories");
2660 ret = LTTNG_ERR_CREATE_DIR_FAIL;
2661 goto error;
2662 }
2663 }
2664 }
2665
2666 /* Kernel tracing */
2667 if (ksession != NULL) {
2668 DBG("Start kernel tracing session %s", session->name);
2669 ret = start_kernel_session(ksession, kernel_tracer_fd);
2670 if (ret != LTTNG_OK) {
2671 goto error;
2672 }
2673 }
2674
2675 /* Flag session that trace should start automatically */
2676 if (usess) {
2677 /*
2678 * Even though the start trace might fail, flag this session active so
2679 * other application coming in are started by default.
2680 */
2681 usess->active = 1;
2682
2683 ret = ust_app_start_trace_all(usess);
2684 if (ret < 0) {
2685 ret = LTTNG_ERR_UST_START_FAIL;
2686 goto error;
2687 }
2688 }
2689
2690 /* Flag this after a successful start. */
2691 session->has_been_started = 1;
2692 session->active = 1;
2693
2694 /*
2695 * Clear the flag that indicates that a rotation was done while the
2696 * session was stopped.
2697 */
2698 session->rotated_after_last_stop = false;
2699
2700 if (session->rotate_timer_period) {
2701 ret = sessiond_rotate_timer_start(session,
2702 session->rotate_timer_period);
2703 if (ret < 0) {
2704 ERR("Failed to enable rotate timer");
2705 ret = LTTNG_ERR_UNK;
2706 goto error;
2707 }
2708 }
2709
2710 ret = LTTNG_OK;
2711
2712 error:
2713 return ret;
2714 }
2715
2716 static
2717 int rename_active_chunk(struct ltt_session *session)
2718 {
2719 int ret;
2720
2721 session->current_archive_id++;
2722
2723 /*
2724 * The currently active tracing path is now the folder we
2725 * want to rename.
2726 */
2727 ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
2728 session->rotation_chunk.active_tracing_path,
2729 sizeof(session->rotation_chunk.current_rotate_path));
2730 if (ret) {
2731 ERR("Failed to copy active tracing path");
2732 goto end;
2733 }
2734
2735 ret = rename_complete_chunk(session, time(NULL));
2736 if (ret < 0) {
2737 ERR("Failed to rename current rotate path");
2738 goto end;
2739 }
2740
2741 /*
2742 * We just renamed, the folder, we didn't do an actual rotation, so
2743 * the active tracing path is now the renamed folder and we have to
2744 * restore the rotate count.
2745 */
2746 ret = lttng_strncpy(session->rotation_chunk.active_tracing_path,
2747 session->rotation_chunk.current_rotate_path,
2748 sizeof(session->rotation_chunk.active_tracing_path));
2749 if (ret) {
2750 ERR("Failed to rename active session chunk tracing path");
2751 goto end;
2752 }
2753 end:
2754 session->current_archive_id--;
2755 return ret;
2756 }
2757
2758 /*
2759 * Command LTTNG_STOP_TRACE processed by the client thread.
2760 */
2761 int cmd_stop_trace(struct ltt_session *session)
2762 {
2763 int ret;
2764 struct ltt_kernel_channel *kchan;
2765 struct ltt_kernel_session *ksession;
2766 struct ltt_ust_session *usess;
2767 bool error_occured = false;
2768
2769 assert(session);
2770
2771 DBG("Begin stop session %s (id %" PRIu64 ")", session->name, session->id);
2772 /* Short cut */
2773 ksession = session->kernel_session;
2774 usess = session->ust_session;
2775
2776 /* Session is not active. Skip everythong and inform the client. */
2777 if (!session->active) {
2778 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2779 goto error;
2780 }
2781
2782 if (session->rotate_relay_pending_timer_enabled) {
2783 sessiond_timer_rotate_pending_stop(session);
2784 }
2785
2786 if (session->rotate_timer_enabled) {
2787 sessiond_rotate_timer_stop(session);
2788 }
2789
2790 if (session->current_archive_id > 0 && !session->rotate_pending) {
2791 ret = rename_active_chunk(session);
2792 if (ret) {
2793 /*
2794 * This error should not prevent the user from stopping
2795 * the session. However, it will be reported at the end.
2796 */
2797 error_occured = true;
2798 }
2799 }
2800
2801 /* Kernel tracer */
2802 if (ksession && ksession->active) {
2803 DBG("Stop kernel tracing");
2804
2805 ret = kernel_stop_session(ksession);
2806 if (ret < 0) {
2807 ret = LTTNG_ERR_KERN_STOP_FAIL;
2808 goto error;
2809 }
2810
2811 kernel_wait_quiescent(kernel_tracer_fd);
2812
2813 /* Flush metadata after stopping (if exists) */
2814 if (ksession->metadata_stream_fd >= 0) {
2815 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2816 if (ret < 0) {
2817 ERR("Kernel metadata flush failed");
2818 }
2819 }
2820
2821 /* Flush all buffers after stopping */
2822 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2823 ret = kernel_flush_buffer(kchan);
2824 if (ret < 0) {
2825 ERR("Kernel flush buffer error");
2826 }
2827 }
2828
2829 ksession->active = 0;
2830 DBG("Kernel session stopped %s (id %" PRIu64 ")", session->name,
2831 session->id);
2832 }
2833
2834 if (usess && usess->active) {
2835 /*
2836 * Even though the stop trace might fail, flag this session inactive so
2837 * other application coming in are not started by default.
2838 */
2839 usess->active = 0;
2840
2841 ret = ust_app_stop_trace_all(usess);
2842 if (ret < 0) {
2843 ret = LTTNG_ERR_UST_STOP_FAIL;
2844 goto error;
2845 }
2846 }
2847
2848 /* Flag inactive after a successful stop. */
2849 session->active = 0;
2850 ret = !error_occured ? LTTNG_OK : LTTNG_ERR_UNK;
2851
2852 error:
2853 return ret;
2854 }
2855
2856 /*
2857 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2858 */
2859 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2860 struct lttng_uri *uris)
2861 {
2862 int ret, i;
2863 struct ltt_kernel_session *ksess = session->kernel_session;
2864 struct ltt_ust_session *usess = session->ust_session;
2865
2866 assert(session);
2867 assert(uris);
2868 assert(nb_uri > 0);
2869
2870 /* Can't set consumer URI if the session is active. */
2871 if (session->active) {
2872 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2873 goto error;
2874 }
2875
2876 /* Set the "global" consumer URIs */
2877 for (i = 0; i < nb_uri; i++) {
2878 ret = add_uri_to_consumer(session->consumer,
2879 &uris[i], 0, session->name);
2880 if (ret != LTTNG_OK) {
2881 goto error;
2882 }
2883 }
2884
2885 /* Set UST session URIs */
2886 if (session->ust_session) {
2887 for (i = 0; i < nb_uri; i++) {
2888 ret = add_uri_to_consumer(
2889 session->ust_session->consumer,
2890 &uris[i], LTTNG_DOMAIN_UST,
2891 session->name);
2892 if (ret != LTTNG_OK) {
2893 goto error;
2894 }
2895 }
2896 }
2897
2898 /* Set kernel session URIs */
2899 if (session->kernel_session) {
2900 for (i = 0; i < nb_uri; i++) {
2901 ret = add_uri_to_consumer(
2902 session->kernel_session->consumer,
2903 &uris[i], LTTNG_DOMAIN_KERNEL,
2904 session->name);
2905 if (ret != LTTNG_OK) {
2906 goto error;
2907 }
2908 }
2909 }
2910
2911 /*
2912 * Make sure to set the session in output mode after we set URI since a
2913 * session can be created without URL (thus flagged in no output mode).
2914 */
2915 session->output_traces = 1;
2916 if (ksess) {
2917 ksess->output_traces = 1;
2918 }
2919
2920 if (usess) {
2921 usess->output_traces = 1;
2922 }
2923
2924 /* All good! */
2925 ret = LTTNG_OK;
2926
2927 error:
2928 return ret;
2929 }
2930
2931 /*
2932 * Command LTTNG_CREATE_SESSION processed by the client thread.
2933 */
2934 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2935 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2936 {
2937 int ret;
2938 struct ltt_session *session;
2939
2940 assert(name);
2941 assert(creds);
2942
2943 /*
2944 * Verify if the session already exist
2945 *
2946 * XXX: There is no need for the session lock list here since the caller
2947 * (process_client_msg) is holding it. We might want to change that so a
2948 * single command does not lock the entire session list.
2949 */
2950 session = session_find_by_name(name);
2951 if (session != NULL) {
2952 ret = LTTNG_ERR_EXIST_SESS;
2953 goto find_error;
2954 }
2955
2956 /* Create tracing session in the registry */
2957 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2958 LTTNG_SOCK_GET_GID_CRED(creds));
2959 if (ret != LTTNG_OK) {
2960 goto session_error;
2961 }
2962
2963 /*
2964 * Get the newly created session pointer back
2965 *
2966 * XXX: There is no need for the session lock list here since the caller
2967 * (process_client_msg) is holding it. We might want to change that so a
2968 * single command does not lock the entire session list.
2969 */
2970 session = session_find_by_name(name);
2971 assert(session);
2972
2973 session->live_timer = live_timer;
2974 /* Create default consumer output for the session not yet created. */
2975 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2976 if (session->consumer == NULL) {
2977 ret = LTTNG_ERR_FATAL;
2978 goto consumer_error;
2979 }
2980
2981 if (uris) {
2982 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2983 if (ret != LTTNG_OK) {
2984 goto consumer_error;
2985 }
2986 session->output_traces = 1;
2987 } else {
2988 session->output_traces = 0;
2989 DBG2("Session %s created with no output", session->name);
2990 }
2991
2992 session->consumer->enabled = 1;
2993
2994 return LTTNG_OK;
2995
2996 consumer_error:
2997 session_destroy(session);
2998 session_error:
2999 find_error:
3000 return ret;
3001 }
3002
3003 /*
3004 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
3005 */
3006 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
3007 size_t nb_uri, lttng_sock_cred *creds)
3008 {
3009 int ret;
3010 struct ltt_session *session;
3011 struct snapshot_output *new_output = NULL;
3012
3013 assert(name);
3014 assert(creds);
3015
3016 /*
3017 * Create session in no output mode with URIs set to NULL. The uris we've
3018 * received are for a default snapshot output if one.
3019 */
3020 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
3021 if (ret != LTTNG_OK) {
3022 goto error;
3023 }
3024
3025 /* Get the newly created session pointer back. This should NEVER fail. */
3026 session = session_find_by_name(name);
3027 assert(session);
3028
3029 /* Flag session for snapshot mode. */
3030 session->snapshot_mode = 1;
3031
3032 /* Skip snapshot output creation if no URI is given. */
3033 if (nb_uri == 0) {
3034 goto end;
3035 }
3036
3037 new_output = snapshot_output_alloc();
3038 if (!new_output) {
3039 ret = LTTNG_ERR_NOMEM;
3040 goto error_snapshot_alloc;
3041 }
3042
3043 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
3044 uris, nb_uri, session->consumer, new_output, &session->snapshot);
3045 if (ret < 0) {
3046 if (ret == -ENOMEM) {
3047 ret = LTTNG_ERR_NOMEM;
3048 } else {
3049 ret = LTTNG_ERR_INVALID;
3050 }
3051 goto error_snapshot;
3052 }
3053
3054 rcu_read_lock();
3055 snapshot_add_output(&session->snapshot, new_output);
3056 rcu_read_unlock();
3057
3058 end:
3059 return LTTNG_OK;
3060
3061 error_snapshot:
3062 snapshot_output_destroy(new_output);
3063 error_snapshot_alloc:
3064 session_destroy(session);
3065 error:
3066 return ret;
3067 }
3068
3069 /*
3070 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3071 *
3072 * Called with session lock held.
3073 */
3074 int cmd_destroy_session(struct ltt_session *session, int wpipe,
3075 struct notification_thread_handle *notification_thread_handle)
3076 {
3077 int ret;
3078 struct ltt_ust_session *usess;
3079 struct ltt_kernel_session *ksess;
3080
3081 /* Safety net */
3082 assert(session);
3083
3084 usess = session->ust_session;
3085 ksess = session->kernel_session;
3086
3087 DBG("Begin destroy session %s (id %" PRIu64 ")", session->name, session->id);
3088
3089 if (session->rotate_relay_pending_timer_enabled) {
3090 sessiond_timer_rotate_pending_stop(session);
3091 }
3092
3093 if (session->rotate_timer_enabled) {
3094 sessiond_rotate_timer_stop(session);
3095 }
3096
3097 if (session->rotate_size) {
3098 unsubscribe_session_consumed_size_rotation(session, notification_thread_handle);
3099 session->rotate_size = 0;
3100 }
3101
3102 /*
3103 * The rename of the current chunk is performed at stop, but if we rotated
3104 * the session after the previous stop command, we need to rename the
3105 * new (and empty) chunk that was started in between.
3106 */
3107 if (session->rotated_after_last_stop) {
3108 rename_active_chunk(session);
3109 }
3110
3111 /* Clean kernel session teardown */
3112 kernel_destroy_session(ksess);
3113
3114 /* UST session teardown */
3115 if (usess) {
3116 /* Close any relayd session */
3117 consumer_output_send_destroy_relayd(usess->consumer);
3118
3119 /* Destroy every UST application related to this session. */
3120 ret = ust_app_destroy_trace_all(usess);
3121 if (ret) {
3122 ERR("Error in ust_app_destroy_trace_all");
3123 }
3124
3125 /* Clean up the rest. */
3126 trace_ust_destroy_session(usess);
3127 }
3128
3129 /*
3130 * Must notify the kernel thread here to update it's poll set in order to
3131 * remove the channel(s)' fd just destroyed.
3132 */
3133 ret = notify_thread_pipe(wpipe);
3134 if (ret < 0) {
3135 PERROR("write kernel poll pipe");
3136 }
3137
3138 if (session->shm_path[0]) {
3139 /*
3140 * When a session is created with an explicit shm_path,
3141 * the consumer daemon will create its shared memory files
3142 * at that location and will *not* unlink them. This is normal
3143 * as the intention of that feature is to make it possible
3144 * to retrieve the content of those files should a crash occur.
3145 *
3146 * To ensure the content of those files can be used, the
3147 * sessiond daemon will replicate the content of the metadata
3148 * cache in a metadata file.
3149 *
3150 * On clean-up, it is expected that the consumer daemon will
3151 * unlink the shared memory files and that the session daemon
3152 * will unlink the metadata file. Then, the session's directory
3153 * in the shm path can be removed.
3154 *
3155 * Unfortunately, a flaw in the design of the sessiond's and
3156 * consumerd's tear down of channels makes it impossible to
3157 * determine when the sessiond _and_ the consumerd have both
3158 * destroyed their representation of a channel. For one, the
3159 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3160 * callbacks in both daemons.
3161 *
3162 * However, it is also impossible for the sessiond to know when
3163 * the consumer daemon is done destroying its channel(s) since
3164 * it occurs as a reaction to the closing of the channel's file
3165 * descriptor. There is no resulting communication initiated
3166 * from the consumerd to the sessiond to confirm that the
3167 * operation is completed (and was successful).
3168 *
3169 * Until this is all fixed, the session daemon checks for the
3170 * removal of the session's shm path which makes it possible
3171 * to safely advertise a session as having been destroyed.
3172 *
3173 * Prior to this fix, it was not possible to reliably save
3174 * a session making use of the --shm-path option, destroy it,
3175 * and load it again. This is because the creation of the
3176 * session would fail upon seeing the session's shm path
3177 * already in existence.
3178 *
3179 * Note that none of the error paths in the check for the
3180 * directory's existence return an error. This is normal
3181 * as there isn't much that can be done. The session will
3182 * be destroyed properly, except that we can't offer the
3183 * guarantee that the same session can be re-created.
3184 */
3185 current_completion_handler = &destroy_completion_handler.handler;
3186 ret = lttng_strncpy(destroy_completion_handler.shm_path,
3187 session->shm_path,
3188 sizeof(destroy_completion_handler.shm_path));
3189 assert(!ret);
3190 }
3191 ret = session_destroy(session);
3192
3193 return ret;
3194 }
3195
3196 /*
3197 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3198 */
3199 int cmd_register_consumer(struct ltt_session *session,
3200 enum lttng_domain_type domain, const char *sock_path,
3201 struct consumer_data *cdata)
3202 {
3203 int ret, sock;
3204 struct consumer_socket *socket = NULL;
3205
3206 assert(session);
3207 assert(cdata);
3208 assert(sock_path);
3209
3210 switch (domain) {
3211 case LTTNG_DOMAIN_KERNEL:
3212 {
3213 struct ltt_kernel_session *ksess = session->kernel_session;
3214
3215 assert(ksess);
3216
3217 /* Can't register a consumer if there is already one */
3218 if (ksess->consumer_fds_sent != 0) {
3219 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
3220 goto error;
3221 }
3222
3223 sock = lttcomm_connect_unix_sock(sock_path);
3224 if (sock < 0) {
3225 ret = LTTNG_ERR_CONNECT_FAIL;
3226 goto error;
3227 }
3228 cdata->cmd_sock = sock;
3229
3230 socket = consumer_allocate_socket(&cdata->cmd_sock);
3231 if (socket == NULL) {
3232 ret = close(sock);
3233 if (ret < 0) {
3234 PERROR("close register consumer");
3235 }
3236 cdata->cmd_sock = -1;
3237 ret = LTTNG_ERR_FATAL;
3238 goto error;
3239 }
3240
3241 socket->lock = zmalloc(sizeof(pthread_mutex_t));
3242 if (socket->lock == NULL) {
3243 PERROR("zmalloc pthread mutex");
3244 ret = LTTNG_ERR_FATAL;
3245 goto error;
3246 }
3247 pthread_mutex_init(socket->lock, NULL);
3248 socket->registered = 1;
3249
3250 rcu_read_lock();
3251 consumer_add_socket(socket, ksess->consumer);
3252 rcu_read_unlock();
3253
3254 pthread_mutex_lock(&cdata->pid_mutex);
3255 cdata->pid = -1;
3256 pthread_mutex_unlock(&cdata->pid_mutex);
3257
3258 break;
3259 }
3260 default:
3261 /* TODO: Userspace tracing */
3262 ret = LTTNG_ERR_UND;
3263 goto error;
3264 }
3265
3266 return LTTNG_OK;
3267
3268 error:
3269 if (socket) {
3270 consumer_destroy_socket(socket);
3271 }
3272 return ret;
3273 }
3274
3275 /*
3276 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3277 */
3278 ssize_t cmd_list_domains(struct ltt_session *session,
3279 struct lttng_domain **domains)
3280 {
3281 int ret, index = 0;
3282 ssize_t nb_dom = 0;
3283 struct agent *agt;
3284 struct lttng_ht_iter iter;
3285
3286 if (session->kernel_session != NULL) {
3287 DBG3("Listing domains found kernel domain");
3288 nb_dom++;
3289 }
3290
3291 if (session->ust_session != NULL) {
3292 DBG3("Listing domains found UST global domain");
3293 nb_dom++;
3294
3295 rcu_read_lock();
3296 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
3297 agt, node.node) {
3298 if (agt->being_used) {
3299 nb_dom++;
3300 }
3301 }
3302 rcu_read_unlock();
3303 }
3304
3305 if (!nb_dom) {
3306 goto end;
3307 }
3308
3309 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3310 if (*domains == NULL) {
3311 ret = LTTNG_ERR_FATAL;
3312 goto error;
3313 }
3314
3315 if (session->kernel_session != NULL) {
3316 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3317
3318 /* Kernel session buffer type is always GLOBAL */
3319 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
3320
3321 index++;
3322 }
3323
3324 if (session->ust_session != NULL) {
3325 (*domains)[index].type = LTTNG_DOMAIN_UST;
3326 (*domains)[index].buf_type = session->ust_session->buffer_type;
3327 index++;
3328
3329 rcu_read_lock();
3330 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
3331 agt, node.node) {
3332 if (agt->being_used) {
3333 (*domains)[index].type = agt->domain;
3334 (*domains)[index].buf_type = session->ust_session->buffer_type;
3335 index++;
3336 }
3337 }
3338 rcu_read_unlock();
3339 }
3340 end:
3341 return nb_dom;
3342
3343 error:
3344 /* Return negative value to differentiate return code */
3345 return -ret;
3346 }
3347
3348
3349 /*
3350 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3351 */
3352 ssize_t cmd_list_channels(enum lttng_domain_type domain,
3353 struct ltt_session *session, struct lttng_channel **channels)
3354 {
3355 ssize_t nb_chan = 0, payload_size = 0, ret;
3356
3357 switch (domain) {
3358 case LTTNG_DOMAIN_KERNEL:
3359 if (session->kernel_session != NULL) {
3360 nb_chan = session->kernel_session->channel_count;
3361 }
3362 DBG3("Number of kernel channels %zd", nb_chan);
3363 if (nb_chan <= 0) {
3364 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
3365 goto end;
3366 }
3367 break;
3368 case LTTNG_DOMAIN_UST:
3369 if (session->ust_session != NULL) {
3370 rcu_read_lock();
3371 nb_chan = lttng_ht_get_count(
3372 session->ust_session->domain_global.channels);
3373 rcu_read_unlock();
3374 }
3375 DBG3("Number of UST global channels %zd", nb_chan);
3376 if (nb_chan < 0) {
3377 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
3378 goto end;
3379 }
3380 break;
3381 default:
3382 ret = -LTTNG_ERR_UND;
3383 goto end;
3384 }
3385
3386 if (nb_chan > 0) {
3387 const size_t channel_size = sizeof(struct lttng_channel) +
3388 sizeof(struct lttng_channel_extended);
3389 struct lttng_channel_extended *channel_exts;
3390
3391 payload_size = nb_chan * channel_size;
3392 *channels = zmalloc(payload_size);
3393 if (*channels == NULL) {
3394 ret = -LTTNG_ERR_FATAL;
3395 goto end;
3396 }
3397
3398 channel_exts = ((void *) *channels) +
3399 (nb_chan * sizeof(struct lttng_channel));
3400 ret = list_lttng_channels(domain, session, *channels, channel_exts);
3401 if (ret != LTTNG_OK) {
3402 free(*channels);
3403 *channels = NULL;
3404 goto end;
3405 }
3406 } else {
3407 *channels = NULL;
3408 }
3409
3410 ret = payload_size;
3411 end:
3412 return ret;
3413 }
3414
3415 /*
3416 * Command LTTNG_LIST_EVENTS processed by the client thread.
3417 */
3418 ssize_t cmd_list_events(enum lttng_domain_type domain,
3419 struct ltt_session *session, char *channel_name,
3420 struct lttng_event **events, size_t *total_size)
3421 {
3422 int ret = 0;
3423 ssize_t nb_event = 0;
3424
3425 switch (domain) {
3426 case LTTNG_DOMAIN_KERNEL:
3427 if (session->kernel_session != NULL) {
3428 nb_event = list_lttng_kernel_events(channel_name,
3429 session->kernel_session, events,
3430 total_size);
3431 }
3432 break;
3433 case LTTNG_DOMAIN_UST:
3434 {
3435 if (session->ust_session != NULL) {
3436 nb_event = list_lttng_ust_global_events(channel_name,
3437 &session->ust_session->domain_global, events,
3438 total_size);
3439 }
3440 break;
3441 }
3442 case LTTNG_DOMAIN_LOG4J:
3443 case LTTNG_DOMAIN_JUL:
3444 case LTTNG_DOMAIN_PYTHON:
3445 if (session->ust_session) {
3446 struct lttng_ht_iter iter;
3447 struct agent *agt;
3448
3449 rcu_read_lock();
3450 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3451 &iter.iter, agt, node.node) {
3452 if (agt->domain == domain) {
3453 nb_event = list_lttng_agent_events(
3454 agt, events,
3455 total_size);
3456 break;
3457 }
3458 }
3459 rcu_read_unlock();
3460 }
3461 break;
3462 default:
3463 ret = LTTNG_ERR_UND;
3464 goto error;
3465 }
3466
3467 return nb_event;
3468
3469 error:
3470 /* Return negative value to differentiate return code */
3471 return -ret;
3472 }
3473
3474 /*
3475 * Using the session list, filled a lttng_session array to send back to the
3476 * client for session listing.
3477 *
3478 * The session list lock MUST be acquired before calling this function. Use
3479 * session_lock_list() and session_unlock_list().
3480 */
3481 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3482 gid_t gid)
3483 {
3484 int ret;
3485 unsigned int i = 0;
3486 struct ltt_session *session;
3487 struct ltt_session_list *list = session_get_list();
3488
3489 DBG("Getting all available session for UID %d GID %d",
3490 uid, gid);
3491 /*
3492 * Iterate over session list and append data after the control struct in
3493 * the buffer.
3494 */
3495 cds_list_for_each_entry(session, &list->head, list) {
3496 /*
3497 * Only list the sessions the user can control.
3498 */
3499 if (!session_access_ok(session, uid, gid)) {
3500 continue;
3501 }
3502
3503 struct ltt_kernel_session *ksess = session->kernel_session;
3504 struct ltt_ust_session *usess = session->ust_session;
3505
3506 if (session->consumer->type == CONSUMER_DST_NET ||
3507 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3508 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3509 ret = build_network_session_path(sessions[i].path,
3510 sizeof(sessions[i].path), session);
3511 } else {
3512 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
3513 session->consumer->dst.session_root_path);
3514 }
3515 if (ret < 0) {
3516 PERROR("snprintf session path");
3517 continue;
3518 }
3519
3520 strncpy(sessions[i].name, session->name, NAME_MAX);
3521 sessions[i].name[NAME_MAX - 1] = '\0';
3522 sessions[i].enabled = session->active;
3523 sessions[i].snapshot_mode = session->snapshot_mode;
3524 sessions[i].live_timer_interval = session->live_timer;
3525 i++;
3526 }
3527 }
3528
3529 /*
3530 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3531 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3532 */
3533 int cmd_data_pending(struct ltt_session *session)
3534 {
3535 int ret;
3536 struct ltt_kernel_session *ksess = session->kernel_session;
3537 struct ltt_ust_session *usess = session->ust_session;
3538
3539 assert(session);
3540
3541 DBG("Data pending for session %s", session->name);
3542
3543 /* Session MUST be stopped to ask for data availability. */
3544 if (session->active) {
3545 ret = LTTNG_ERR_SESSION_STARTED;
3546 goto error;
3547 } else {
3548 /*
3549 * If stopped, just make sure we've started before else the above call
3550 * will always send that there is data pending.
3551 *
3552 * The consumer assumes that when the data pending command is received,
3553 * the trace has been started before or else no output data is written
3554 * by the streams which is a condition for data pending. So, this is
3555 * *VERY* important that we don't ask the consumer before a start
3556 * trace.
3557 */
3558 if (!session->has_been_started) {
3559 ret = 0;
3560 goto error;
3561 }
3562 }
3563
3564 /*
3565 * A rotation is still pending, we have to wait.
3566 */
3567 if (session->rotate_pending) {
3568 DBG("Rotate still pending for session %s", session->name);
3569 ret = 1;
3570 goto error;
3571 }
3572
3573 if (ksess && ksess->consumer) {
3574 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3575 if (ret == 1) {
3576 /* Data is still being extracted for the kernel. */
3577 goto error;
3578 }
3579 }
3580
3581 if (usess && usess->consumer) {
3582 ret = consumer_is_data_pending(usess->id, usess->consumer);
3583 if (ret == 1) {
3584 /* Data is still being extracted for the kernel. */
3585 goto error;
3586 }
3587 }
3588
3589 /* Data is ready to be read by a viewer */
3590 ret = 0;
3591
3592 error:
3593 return ret;
3594 }
3595
3596 /*
3597 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3598 *
3599 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3600 */
3601 int cmd_snapshot_add_output(struct ltt_session *session,
3602 struct lttng_snapshot_output *output, uint32_t *id)
3603 {
3604 int ret;
3605 struct snapshot_output *new_output;
3606
3607 assert(session);
3608 assert(output);
3609
3610 DBG("Cmd snapshot add output for session %s", session->name);
3611
3612 /*
3613 * Can't create an output if the session is not set in no-output mode.
3614 */
3615 if (session->output_traces) {
3616 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3617 goto error;
3618 }
3619
3620 /* Only one output is allowed until we have the "tee" feature. */
3621 if (session->snapshot.nb_output == 1) {
3622 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3623 goto error;
3624 }
3625
3626 new_output = snapshot_output_alloc();
3627 if (!new_output) {
3628 ret = LTTNG_ERR_NOMEM;
3629 goto error;
3630 }
3631
3632 ret = snapshot_output_init(output->max_size, output->name,
3633 output->ctrl_url, output->data_url, session->consumer, new_output,
3634 &session->snapshot);
3635 if (ret < 0) {
3636 if (ret == -ENOMEM) {
3637 ret = LTTNG_ERR_NOMEM;
3638 } else {
3639 ret = LTTNG_ERR_INVALID;
3640 }
3641 goto free_error;
3642 }
3643
3644 rcu_read_lock();
3645 snapshot_add_output(&session->snapshot, new_output);
3646 if (id) {
3647 *id = new_output->id;
3648 }
3649 rcu_read_unlock();
3650
3651 return LTTNG_OK;
3652
3653 free_error:
3654 snapshot_output_destroy(new_output);
3655 error:
3656 return ret;
3657 }
3658
3659 /*
3660 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3661 *
3662 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3663 */
3664 int cmd_snapshot_del_output(struct ltt_session *session,
3665 struct lttng_snapshot_output *output)
3666 {
3667 int ret;
3668 struct snapshot_output *sout = NULL;
3669
3670 assert(session);
3671 assert(output);
3672
3673 rcu_read_lock();
3674
3675 /*
3676 * Permission denied to create an output if the session is not
3677 * set in no output mode.
3678 */
3679 if (session->output_traces) {
3680 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3681 goto error;
3682 }
3683
3684 if (output->id) {
3685 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3686 session->name);
3687 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3688 } else if (*output->name != '\0') {
3689 DBG("Cmd snapshot del output name %s for session %s", output->name,
3690 session->name);
3691 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3692 }
3693 if (!sout) {
3694 ret = LTTNG_ERR_INVALID;
3695 goto error;
3696 }
3697
3698 snapshot_delete_output(&session->snapshot, sout);
3699 snapshot_output_destroy(sout);
3700 ret = LTTNG_OK;
3701
3702 error:
3703 rcu_read_unlock();
3704 return ret;
3705 }
3706
3707 /*
3708 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3709 *
3710 * If no output is available, outputs is untouched and 0 is returned.
3711 *
3712 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3713 */
3714 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3715 struct lttng_snapshot_output **outputs)
3716 {
3717 int ret, idx = 0;
3718 struct lttng_snapshot_output *list = NULL;
3719 struct lttng_ht_iter iter;
3720 struct snapshot_output *output;
3721
3722 assert(session);
3723 assert(outputs);
3724
3725 DBG("Cmd snapshot list outputs for session %s", session->name);
3726
3727 /*
3728 * Permission denied to create an output if the session is not
3729 * set in no output mode.
3730 */
3731 if (session->output_traces) {
3732 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3733 goto end;
3734 }
3735
3736 if (session->snapshot.nb_output == 0) {
3737 ret = 0;
3738 goto end;
3739 }
3740
3741 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3742 if (!list) {
3743 ret = -LTTNG_ERR_NOMEM;
3744 goto end;
3745 }
3746
3747 /* Copy list from session to the new list object. */
3748 rcu_read_lock();
3749 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3750 output, node.node) {
3751 assert(output->consumer);
3752 list[idx].id = output->id;
3753 list[idx].max_size = output->max_size;
3754 if (lttng_strncpy(list[idx].name, output->name,
3755 sizeof(list[idx].name))) {
3756 ret = -LTTNG_ERR_INVALID;
3757 goto error;
3758 }
3759 if (output->consumer->type == CONSUMER_DST_LOCAL) {
3760 if (lttng_strncpy(list[idx].ctrl_url,
3761 output->consumer->dst.session_root_path,
3762 sizeof(list[idx].ctrl_url))) {
3763 ret = -LTTNG_ERR_INVALID;
3764 goto error;
3765 }
3766 } else {
3767 /* Control URI. */
3768 ret = uri_to_str_url(&output->consumer->dst.net.control,
3769 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3770 if (ret < 0) {
3771 ret = -LTTNG_ERR_NOMEM;
3772 goto error;
3773 }
3774
3775 /* Data URI. */
3776 ret = uri_to_str_url(&output->consumer->dst.net.data,
3777 list[idx].data_url, sizeof(list[idx].data_url));
3778 if (ret < 0) {
3779 ret = -LTTNG_ERR_NOMEM;
3780 goto error;
3781 }
3782 }
3783 idx++;
3784 }
3785
3786 *outputs = list;
3787 list = NULL;
3788 ret = session->snapshot.nb_output;
3789 error:
3790 rcu_read_unlock();
3791 free(list);
3792 end:
3793 return ret;
3794 }
3795
3796 /*
3797 * Check if we can regenerate the metadata for this session.
3798 * Only kernel, UST per-uid and non-live sessions are supported.
3799 *
3800 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3801 */
3802 static
3803 int check_regenerate_metadata_support(struct ltt_session *session)
3804 {
3805 int ret;
3806
3807 assert(session);
3808
3809 if (session->live_timer != 0) {
3810 ret = LTTNG_ERR_LIVE_SESSION;
3811 goto end;
3812 }
3813 if (!session->active) {
3814 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3815 goto end;
3816 }
3817 if (session->ust_session) {
3818 switch (session->ust_session->buffer_type) {
3819 case LTTNG_BUFFER_PER_UID:
3820 break;
3821 case LTTNG_BUFFER_PER_PID:
3822 ret = LTTNG_ERR_PER_PID_SESSION;
3823 goto end;
3824 default:
3825 assert(0);
3826 ret = LTTNG_ERR_UNK;
3827 goto end;
3828 }
3829 }
3830 if (session->consumer->type == CONSUMER_DST_NET &&
3831 session->consumer->relay_minor_version < 8) {
3832 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
3833 goto end;
3834 }
3835 ret = 0;
3836
3837 end:
3838 return ret;
3839 }
3840
3841 static
3842 int clear_metadata_file(int fd)
3843 {
3844 int ret;
3845 off_t lseek_ret;
3846
3847 lseek_ret = lseek(fd, 0, SEEK_SET);
3848 if (lseek_ret < 0) {
3849 PERROR("lseek");
3850 ret = -1;
3851 goto end;
3852 }
3853
3854 ret = ftruncate(fd, 0);
3855 if (ret < 0) {
3856 PERROR("ftruncate");
3857 goto end;
3858 }
3859
3860 end:
3861 return ret;
3862 }
3863
3864 static
3865 int ust_regenerate_metadata(struct ltt_ust_session *usess)
3866 {
3867 int ret = 0;
3868 struct buffer_reg_uid *uid_reg = NULL;
3869 struct buffer_reg_session *session_reg = NULL;
3870
3871 rcu_read_lock();
3872 cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) {
3873 struct ust_registry_session *registry;
3874 struct ust_registry_channel *chan;
3875 struct lttng_ht_iter iter_chan;
3876
3877 session_reg = uid_reg->registry;
3878 registry = session_reg->reg.ust;
3879
3880 pthread_mutex_lock(&registry->lock);
3881 registry->metadata_len_sent = 0;
3882 memset(registry->metadata, 0, registry->metadata_alloc_len);
3883 registry->metadata_len = 0;
3884 registry->metadata_version++;
3885 if (registry->metadata_fd > 0) {
3886 /* Clear the metadata file's content. */
3887 ret = clear_metadata_file(registry->metadata_fd);
3888 if (ret) {
3889 pthread_mutex_unlock(&registry->lock);
3890 goto end;
3891 }
3892 }
3893
3894 ret = ust_metadata_session_statedump(registry, NULL,
3895 registry->major, registry->minor);
3896 if (ret) {
3897 pthread_mutex_unlock(&registry->lock);
3898 ERR("Failed to generate session metadata (err = %d)",
3899 ret);
3900 goto end;
3901 }
3902 cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter,
3903 chan, node.node) {
3904 struct ust_registry_event *event;
3905 struct lttng_ht_iter iter_event;
3906
3907 ret = ust_metadata_channel_statedump(registry, chan);
3908 if (ret) {
3909 pthread_mutex_unlock(&registry->lock);
3910 ERR("Failed to generate channel metadata "
3911 "(err = %d)", ret);
3912 goto end;
3913 }
3914 cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter,
3915 event, node.node) {
3916 ret = ust_metadata_event_statedump(registry,
3917 chan, event);
3918 if (ret) {
3919 pthread_mutex_unlock(&registry->lock);
3920 ERR("Failed to generate event metadata "
3921 "(err = %d)", ret);
3922 goto end;
3923 }
3924 }
3925 }
3926 pthread_mutex_unlock(&registry->lock);
3927 }
3928
3929 end:
3930 rcu_read_unlock();
3931 return ret;
3932 }
3933
3934 /*
3935 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
3936 *
3937 * Ask the consumer to truncate the existing metadata file(s) and
3938 * then regenerate the metadata. Live and per-pid sessions are not
3939 * supported and return an error.
3940 *
3941 * Return 0 on success or else a LTTNG_ERR code.
3942 */
3943 int cmd_regenerate_metadata(struct ltt_session *session)
3944 {
3945 int ret;
3946
3947 assert(session);
3948
3949 ret = check_regenerate_metadata_support(session);
3950 if (ret) {
3951 goto end;
3952 }
3953
3954 if (session->kernel_session) {
3955 ret = kernctl_session_regenerate_metadata(
3956 session->kernel_session->fd);
3957 if (ret < 0) {
3958 ERR("Failed to regenerate the kernel metadata");
3959 goto end;
3960 }
3961 }
3962
3963 if (session->ust_session) {
3964 ret = ust_regenerate_metadata(session->ust_session);
3965 if (ret < 0) {
3966 ERR("Failed to regenerate the UST metadata");
3967 goto end;
3968 }
3969 }
3970 DBG("Cmd metadata regenerate for session %s", session->name);
3971 ret = LTTNG_OK;
3972
3973 end:
3974 return ret;
3975 }
3976
3977 /*
3978 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
3979 *
3980 * Ask the tracer to regenerate a new statedump.
3981 *
3982 * Return 0 on success or else a LTTNG_ERR code.
3983 */
3984 int cmd_regenerate_statedump(struct ltt_session *session)
3985 {
3986 int ret;
3987
3988 assert(session);
3989
3990 if (!session->active) {
3991 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3992 goto end;
3993 }
3994
3995 if (session->kernel_session) {
3996 ret = kernctl_session_regenerate_statedump(
3997 session->kernel_session->fd);
3998 /*
3999 * Currently, the statedump in kernel can only fail if out
4000 * of memory.
4001 */
4002 if (ret < 0) {
4003 if (ret == -ENOMEM) {
4004 ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM;
4005 } else {
4006 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
4007 }
4008 ERR("Failed to regenerate the kernel statedump");
4009 goto end;
4010 }
4011 }
4012
4013 if (session->ust_session) {
4014 ret = ust_app_regenerate_statedump_all(session->ust_session);
4015 /*
4016 * Currently, the statedump in UST always returns 0.
4017 */
4018 if (ret < 0) {
4019 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
4020 ERR("Failed to regenerate the UST statedump");
4021 goto end;
4022 }
4023 }
4024 DBG("Cmd regenerate statedump for session %s", session->name);
4025 ret = LTTNG_OK;
4026
4027 end:
4028 return ret;
4029 }
4030
4031 int cmd_register_trigger(struct command_ctx *cmd_ctx, int sock,
4032 struct notification_thread_handle *notification_thread)
4033 {
4034 int ret;
4035 size_t trigger_len;
4036 ssize_t sock_recv_len;
4037 struct lttng_trigger *trigger = NULL;
4038 struct lttng_buffer_view view;
4039 struct lttng_dynamic_buffer trigger_buffer;
4040
4041 lttng_dynamic_buffer_init(&trigger_buffer);
4042 trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length;
4043 ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len);
4044 if (ret) {
4045 ret = LTTNG_ERR_NOMEM;
4046 goto end;
4047 }
4048
4049 sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data,
4050 trigger_len);
4051 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
4052 ERR("Failed to receive \"register trigger\" command payload");
4053 /* TODO: should this be a new error enum ? */
4054 ret = LTTNG_ERR_INVALID_TRIGGER;
4055 goto end;
4056 }
4057
4058 view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1);
4059 if (lttng_trigger_create_from_buffer(&view, &trigger) !=
4060 trigger_len) {
4061 ERR("Invalid trigger payload received in \"register trigger\" command");
4062 ret = LTTNG_ERR_INVALID_TRIGGER;
4063 goto end;
4064 }
4065
4066 ret = notification_thread_command_register_trigger(notification_thread,
4067 trigger);
4068 /* Ownership of trigger was transferred. */
4069 trigger = NULL;
4070 end:
4071 lttng_trigger_destroy(trigger);
4072 lttng_dynamic_buffer_reset(&trigger_buffer);
4073 return ret;
4074 }
4075
4076 int cmd_unregister_trigger(struct command_ctx *cmd_ctx, int sock,
4077 struct notification_thread_handle *notification_thread)
4078 {
4079 int ret;
4080 size_t trigger_len;
4081 ssize_t sock_recv_len;
4082 struct lttng_trigger *trigger = NULL;
4083 struct lttng_buffer_view view;
4084 struct lttng_dynamic_buffer trigger_buffer;
4085
4086 lttng_dynamic_buffer_init(&trigger_buffer);
4087 trigger_len = (size_t) cmd_ctx->lsm->u.trigger.length;
4088 ret = lttng_dynamic_buffer_set_size(&trigger_buffer, trigger_len);
4089 if (ret) {
4090 ret = LTTNG_ERR_NOMEM;
4091 goto end;
4092 }
4093
4094 sock_recv_len = lttcomm_recv_unix_sock(sock, trigger_buffer.data,
4095 trigger_len);
4096 if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
4097 ERR("Failed to receive \"unregister trigger\" command payload");
4098 /* TODO: should this be a new error enum ? */
4099 ret = LTTNG_ERR_INVALID_TRIGGER;
4100 goto end;
4101 }
4102
4103 view = lttng_buffer_view_from_dynamic_buffer(&trigger_buffer, 0, -1);
4104 if (lttng_trigger_create_from_buffer(&view, &trigger) !=
4105 trigger_len) {
4106 ERR("Invalid trigger payload received in \"unregister trigger\" command");
4107 ret = LTTNG_ERR_INVALID_TRIGGER;
4108 goto end;
4109 }
4110
4111 ret = notification_thread_command_unregister_trigger(notification_thread,
4112 trigger);
4113 end:
4114 lttng_trigger_destroy(trigger);
4115 lttng_dynamic_buffer_reset(&trigger_buffer);
4116 return ret;
4117 }
4118
4119 /*
4120 * Send relayd sockets from snapshot output to consumer. Ignore request if the
4121 * snapshot output is *not* set with a remote destination.
4122 *
4123 * Return 0 on success or a LTTNG_ERR code.
4124 */
4125 static int set_relayd_for_snapshot(struct consumer_output *consumer,
4126 struct snapshot_output *snap_output, struct ltt_session *session)
4127 {
4128 int ret = LTTNG_OK;
4129 struct lttng_ht_iter iter;
4130 struct consumer_socket *socket;
4131
4132 assert(consumer);
4133 assert(snap_output);
4134 assert(session);
4135
4136 DBG2("Set relayd object from snapshot output");
4137
4138 /* Ignore if snapshot consumer output is not network. */
4139 if (snap_output->consumer->type != CONSUMER_DST_NET) {
4140 goto error;
4141 }
4142
4143 /*
4144 * For each consumer socket, create and send the relayd object of the
4145 * snapshot output.
4146 */
4147 rcu_read_lock();
4148 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
4149 socket, node.node) {
4150 pthread_mutex_lock(socket->lock);
4151 ret = send_consumer_relayd_sockets(0, session->id,
4152 snap_output->consumer, socket,
4153 session->name, session->hostname,
4154 session->live_timer);
4155 pthread_mutex_unlock(socket->lock);
4156 if (ret != LTTNG_OK) {
4157 rcu_read_unlock();
4158 goto error;
4159 }
4160 }
4161 rcu_read_unlock();
4162
4163 error:
4164 return ret;
4165 }
4166
4167 /*
4168 * Record a kernel snapshot.
4169 *
4170 * Return LTTNG_OK on success or a LTTNG_ERR code.
4171 */
4172 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
4173 struct snapshot_output *output, struct ltt_session *session,
4174 int wait, uint64_t nb_packets_per_stream)
4175 {
4176 int ret;
4177
4178 assert(ksess);
4179 assert(output);
4180 assert(session);
4181
4182
4183 /*
4184 * Copy kernel session sockets so we can communicate with the right
4185 * consumer for the snapshot record command.
4186 */
4187 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
4188 if (ret < 0) {
4189 ret = LTTNG_ERR_NOMEM;
4190 goto error;
4191 }
4192
4193 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
4194 if (ret != LTTNG_OK) {
4195 goto error_snapshot;
4196 }
4197
4198 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
4199 if (ret != LTTNG_OK) {
4200 goto error_snapshot;
4201 }
4202
4203 ret = LTTNG_OK;
4204 goto end;
4205
4206 error_snapshot:
4207 /* Clean up copied sockets so this output can use some other later on. */
4208 consumer_destroy_output_sockets(output->consumer);
4209 error:
4210 end:
4211 return ret;
4212 }
4213
4214 /*
4215 * Record a UST snapshot.
4216 *
4217 * Return 0 on success or a LTTNG_ERR error code.
4218 */
4219 static int record_ust_snapshot(struct ltt_ust_session *usess,
4220 struct snapshot_output *output, struct ltt_session *session,
4221 int wait, uint64_t nb_packets_per_stream)
4222 {
4223 int ret;
4224
4225 assert(usess);
4226 assert(output);
4227 assert(session);
4228
4229 /*
4230 * Copy UST session sockets so we can communicate with the right
4231 * consumer for the snapshot record command.
4232 */
4233 ret = consumer_copy_sockets(output->consumer, usess->consumer);
4234 if (ret < 0) {
4235 ret = LTTNG_ERR_NOMEM;
4236 goto error;
4237 }
4238
4239 ret = set_relayd_for_snapshot(usess->consumer, output, session);
4240 if (ret != LTTNG_OK) {
4241 goto error_snapshot;
4242 }
4243
4244 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
4245 if (ret < 0) {
4246 switch (-ret) {
4247 case EINVAL:
4248 ret = LTTNG_ERR_INVALID;
4249 break;
4250 default:
4251 ret = LTTNG_ERR_SNAPSHOT_FAIL;
4252 break;
4253 }
4254 goto error_snapshot;
4255 }
4256
4257 ret = LTTNG_OK;
4258
4259 error_snapshot:
4260 /* Clean up copied sockets so this output can use some other later on. */
4261 consumer_destroy_output_sockets(output->consumer);
4262 error:
4263 return ret;
4264 }
4265
4266 static
4267 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
4268 uint64_t cur_nr_packets)
4269 {
4270 uint64_t tot_size = 0;
4271
4272 if (session->kernel_session) {
4273 struct ltt_kernel_channel *chan;
4274 struct ltt_kernel_session *ksess = session->kernel_session;
4275
4276 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
4277 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
4278 /*
4279 * Don't take channel into account if we
4280 * already grab all its packets.
4281 */
4282 continue;
4283 }
4284 tot_size += chan->channel->attr.subbuf_size
4285 * chan->stream_count;
4286 }
4287 }
4288
4289 if (session->ust_session) {
4290 struct ltt_ust_session *usess = session->ust_session;
4291
4292 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
4293 cur_nr_packets);
4294 }
4295
4296 return tot_size;
4297 }
4298
4299 /*
4300 * Calculate the number of packets we can grab from each stream that
4301 * fits within the overall snapshot max size.
4302 *
4303 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
4304 * the number of packets per stream.
4305 *
4306 * TODO: this approach is not perfect: we consider the worse case
4307 * (packet filling the sub-buffers) as an upper bound, but we could do
4308 * better if we do this calculation while we actually grab the packet
4309 * content: we would know how much padding we don't actually store into
4310 * the file.
4311 *
4312 * This algorithm is currently bounded by the number of packets per
4313 * stream.
4314 *
4315 * Since we call this algorithm before actually grabbing the data, it's
4316 * an approximation: for instance, applications could appear/disappear
4317 * in between this call and actually grabbing data.
4318 */
4319 static
4320 int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
4321 {
4322 int64_t size_left;
4323 uint64_t cur_nb_packets = 0;
4324
4325 if (!max_size) {
4326 return 0; /* Infinite */
4327 }
4328
4329 size_left = max_size;
4330 for (;;) {
4331 uint64_t one_more_packet_tot_size;
4332
4333 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
4334 cur_nb_packets);
4335 if (!one_more_packet_tot_size) {
4336 /* We are already grabbing all packets. */
4337 break;
4338 }
4339 size_left -= one_more_packet_tot_size;
4340 if (size_left < 0) {
4341 break;
4342 }
4343 cur_nb_packets++;
4344 }
4345 if (!cur_nb_packets) {
4346 /* Not enough room to grab one packet of each stream, error. */
4347 return -1;
4348 }
4349 return cur_nb_packets;
4350 }
4351
4352 /*
4353 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
4354 *
4355 * The wait parameter is ignored so this call always wait for the snapshot to
4356 * complete before returning.
4357 *
4358 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4359 */
4360 int cmd_snapshot_record(struct ltt_session *session,
4361 struct lttng_snapshot_output *output, int wait)
4362 {
4363 int ret = LTTNG_OK;
4364 unsigned int use_tmp_output = 0;
4365 struct snapshot_output tmp_output;
4366 unsigned int snapshot_success = 0;
4367 char datetime[16];
4368
4369 assert(session);
4370 assert(output);
4371
4372 DBG("Cmd snapshot record for session %s", session->name);
4373
4374 /* Get the datetime for the snapshot output directory. */
4375 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime,
4376 sizeof(datetime));
4377 if (!ret) {
4378 ret = LTTNG_ERR_INVALID;
4379 goto error;
4380 }
4381
4382 /*
4383 * Permission denied to create an output if the session is not
4384 * set in no output mode.
4385 */
4386 if (session->output_traces) {
4387 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
4388 goto error;
4389 }
4390
4391 /* The session needs to be started at least once. */
4392 if (!session->has_been_started) {
4393 ret = LTTNG_ERR_START_SESSION_ONCE;
4394 goto error;
4395 }
4396
4397 /* Use temporary output for the session. */
4398 if (*output->ctrl_url != '\0') {
4399 ret = snapshot_output_init(output->max_size, output->name,
4400 output->ctrl_url, output->data_url, session->consumer,
4401 &tmp_output, NULL);
4402 if (ret < 0) {
4403 if (ret == -ENOMEM) {
4404 ret = LTTNG_ERR_NOMEM;
4405 } else {
4406 ret = LTTNG_ERR_INVALID;
4407 }
4408 goto error;
4409 }
4410 /* Use the global session count for the temporary snapshot. */
4411 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
4412
4413 /* Use the global datetime */
4414 memcpy(tmp_output.datetime, datetime, sizeof(datetime));
4415 use_tmp_output = 1;
4416 }
4417
4418 if (use_tmp_output) {
4419 int64_t nb_packets_per_stream;
4420
4421 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
4422 tmp_output.max_size);
4423 if (nb_packets_per_stream < 0) {
4424 ret = LTTNG_ERR_MAX_SIZE_INVALID;
4425 goto error;
4426 }
4427
4428 if (session->kernel_session) {
4429 ret = record_kernel_snapshot(session->kernel_session,
4430 &tmp_output, session,
4431 wait, nb_packets_per_stream);
4432 if (ret != LTTNG_OK) {
4433 goto error;
4434 }
4435 }
4436
4437 if (session->ust_session) {
4438 ret = record_ust_snapshot(session->ust_session,
4439 &tmp_output, session,
4440 wait, nb_packets_per_stream);
4441 if (ret != LTTNG_OK) {
4442 goto error;
4443 }
4444 }
4445
4446 snapshot_success = 1;
4447 } else {
4448 struct snapshot_output *sout;
4449 struct lttng_ht_iter iter;
4450
4451 rcu_read_lock();
4452 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
4453 &iter.iter, sout, node.node) {
4454 int64_t nb_packets_per_stream;
4455
4456 /*
4457 * Make a local copy of the output and assign the possible
4458 * temporary value given by the caller.
4459 */
4460 memset(&tmp_output, 0, sizeof(tmp_output));
4461 memcpy(&tmp_output, sout, sizeof(tmp_output));
4462
4463 if (output->max_size != (uint64_t) -1ULL) {
4464 tmp_output.max_size = output->max_size;
4465 }
4466
4467 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
4468 tmp_output.max_size);
4469 if (nb_packets_per_stream < 0) {
4470 ret = LTTNG_ERR_MAX_SIZE_INVALID;
4471 rcu_read_unlock();
4472 goto error;
4473 }
4474
4475 /* Use temporary name. */
4476 if (*output->name != '\0') {
4477 if (lttng_strncpy(tmp_output.name, output->name,
4478 sizeof(tmp_output.name))) {
4479 ret = LTTNG_ERR_INVALID;
4480 rcu_read_unlock();
4481 goto error;
4482 }
4483 }
4484
4485 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
4486 memcpy(tmp_output.datetime, datetime, sizeof(datetime));
4487
4488 if (session->kernel_session) {
4489 ret = record_kernel_snapshot(session->kernel_session,
4490 &tmp_output, session,
4491 wait, nb_packets_per_stream);
4492 if (ret != LTTNG_OK) {
4493 rcu_read_unlock();
4494 goto error;
4495 }
4496 }
4497
4498 if (session->ust_session) {
4499 ret = record_ust_snapshot(session->ust_session,
4500 &tmp_output, session,
4501 wait, nb_packets_per_stream);
4502 if (ret != LTTNG_OK) {
4503 rcu_read_unlock();
4504 goto error;
4505 }
4506 }
4507 snapshot_success = 1;
4508 }
4509 rcu_read_unlock();
4510 }
4511
4512 if (snapshot_success) {
4513 session->snapshot.nb_snapshot++;
4514 } else {
4515 ret = LTTNG_ERR_SNAPSHOT_FAIL;
4516 }
4517
4518 error:
4519 return ret;
4520 }
4521
4522 /*
4523 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
4524 */
4525 int cmd_set_session_shm_path(struct ltt_session *session,
4526 const char *shm_path)
4527 {
4528 /* Safety net */
4529 assert(session);
4530
4531 /*
4532 * Can only set shm path before session is started.
4533 */
4534 if (session->has_been_started) {
4535 return LTTNG_ERR_SESSION_STARTED;
4536 }
4537
4538 strncpy(session->shm_path, shm_path,
4539 sizeof(session->shm_path));
4540 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
4541
4542 return 0;
4543 }
4544
4545 /*
4546 * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
4547 *
4548 * Ask the consumer to rotate the session output directory.
4549 * The session lock must be held.
4550 *
4551 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4552 */
4553 int cmd_rotate_session(struct ltt_session *session,
4554 struct lttng_rotate_session_return *rotate_return)
4555 {
4556 int ret;
4557 size_t strf_ret;
4558 struct tm *timeinfo;
4559 char datetime[21];
4560 time_t now;
4561 bool ust_active = false;
4562
4563 assert(session);
4564
4565 if (!session->has_been_started) {
4566 ret = -LTTNG_ERR_START_SESSION_ONCE;
4567 goto end;
4568 }
4569
4570 if (session->live_timer || session->snapshot_mode ||
4571 !session->output_traces) {
4572 ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE;
4573 goto end;
4574 }
4575
4576 /*
4577 * Unsupported feature in lttng-relayd before 2.11.
4578 */
4579 if (session->consumer->type == CONSUMER_DST_NET &&
4580 (session->consumer->relay_major_version == 2 &&
4581 session->consumer->relay_minor_version < 11)) {
4582 ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY;
4583 goto end;
4584 }
4585
4586 if (session->rotate_pending || session->rotate_pending_relay) {
4587 ret = -LTTNG_ERR_ROTATION_PENDING;
4588 DBG("Rotate already in progress");
4589 goto end;
4590 }
4591
4592 /*
4593 * After a stop, we only allow one rotation to occur, the other ones are
4594 * useless until a new start.
4595 */
4596 if (session->rotated_after_last_stop) {
4597 DBG("Session \"%s\" was already rotated after stop, refusing rotation",
4598 session->name);
4599 ret = -LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP;
4600 goto end;
4601 }
4602
4603 /* Special case for the first rotation. */
4604 if (session->current_archive_id == 0) {
4605 const char *base_path = NULL;
4606
4607 /* Either one of the two sessions is enough to get the root path. */
4608 if (session->kernel_session) {
4609 base_path = session_get_base_path(session);
4610 } else if (session->ust_session) {
4611 base_path = session_get_base_path(session);
4612 } else {
4613 assert(0);
4614 }
4615 assert(base_path);
4616 ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
4617 base_path,
4618 sizeof(session->rotation_chunk.current_rotate_path));
4619 if (ret) {
4620 ERR("Failed to copy session base path to current rotation chunk path");
4621 ret = -LTTNG_ERR_UNK;
4622 goto end;
4623 }
4624 } else {
4625 /*
4626 * The currently active tracing path is now the folder we
4627 * want to rotate.
4628 */
4629 ret = lttng_strncpy(session->rotation_chunk.current_rotate_path,
4630 session->rotation_chunk.active_tracing_path,
4631 sizeof(session->rotation_chunk.current_rotate_path));
4632 if (ret) {
4633 ERR("Failed to copy the active tracing path to the current rotate path");
4634 ret = -LTTNG_ERR_UNK;
4635 goto end;
4636 }
4637 }
4638 DBG("Current rotate path %s", session->rotation_chunk.current_rotate_path);
4639
4640 session->current_archive_id++;
4641 session->rotate_pending = true;
4642 session->rotation_state = LTTNG_ROTATION_STATE_ONGOING;
4643 ret = notification_thread_command_session_rotation_ongoing(
4644 notification_thread_handle,
4645 session->name, session->uid, session->gid,
4646 session->current_archive_id);
4647 if (ret != LTTNG_OK) {
4648 ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
4649 session->name);
4650 }
4651
4652 /*
4653 * Create the path name for the next chunk.
4654 */
4655 now = time(NULL);
4656 if (now == (time_t) -1) {
4657 ret = -LTTNG_ERR_ROTATION_NOT_AVAILABLE;
4658 goto end;
4659 }
4660 session->last_chunk_start_ts = session->current_chunk_start_ts;
4661 session->current_chunk_start_ts = now;
4662
4663 timeinfo = localtime(&now);
4664 if (!timeinfo) {
4665 PERROR("Failed to sample local time in rotate session command");
4666 ret = -LTTNG_ERR_UNK;
4667 goto end;
4668 }
4669 strf_ret = strftime(datetime, sizeof(datetime), "%Y%m%dT%H%M%S%z",
4670 timeinfo);
4671 if (!strf_ret) {
4672 ERR("Failed to format local time timestamp in rotate session command");
4673 ret = -LTTNG_ERR_UNK;
4674 goto end;
4675 }
4676 if (session->kernel_session) {
4677 /*
4678 * The active path for the next rotation/destroy.
4679 * Ex: ~/lttng-traces/auto-20170922-111748/20170922-111754-42
4680 */
4681 ret = snprintf(session->rotation_chunk.active_tracing_path,
4682 sizeof(session->rotation_chunk.active_tracing_path),
4683 "%s/%s-%" PRIu64,
4684 session_get_base_path(session),
4685 datetime, session->current_archive_id + 1);
4686 if (ret < 0 || ret == sizeof(session->rotation_chunk.active_tracing_path)) {
4687 ERR("Failed to format active kernel tracing path in rotate session command");
4688 ret = -LTTNG_ERR_UNK;
4689 goto end;
4690 }
4691 /*
4692 * The sub-directory for the consumer
4693 * Ex: /20170922-111754-42/kernel
4694 */
4695 ret = snprintf(session->kernel_session->consumer->chunk_path,
4696 sizeof(session->kernel_session->consumer->chunk_path),
4697 "/%s-%" PRIu64, datetime,
4698 session->current_archive_id + 1);
4699 if (ret < 0 || ret == sizeof(session->kernel_session->consumer->chunk_path)) {
4700 ERR("Failed to format the kernel consumer's sub-directory in rotate session command");
4701 ret = -LTTNG_ERR_UNK;
4702 goto end;
4703 }
4704 /*
4705 * Create the new chunk folder, before the rotation begins so we don't
4706 * race with the consumer/tracer activity.
4707 */
4708 ret = domain_mkdir(session->kernel_session->consumer, session,
4709 session->kernel_session->uid,
4710 session->kernel_session->gid);
4711 if (ret) {
4712 ERR("Failed to create kernel session tracing path at %s",
4713 session->kernel_session->consumer->chunk_path);
4714 ret = -LTTNG_ERR_CREATE_DIR_FAIL;
4715 goto end;
4716 }
4717 ret = kernel_rotate_session(session);
4718 if (ret != LTTNG_OK) {
4719 ret = -ret;
4720 goto end;
4721 }
4722 }
4723 if (session->ust_session) {
4724 ret = snprintf(session->rotation_chunk.active_tracing_path,
4725 PATH_MAX, "%s/%s-%" PRIu64,
4726 session_get_base_path(session),
4727 datetime, session->current_archive_id + 1);
4728 if (ret < 0) {
4729 ERR("Failed to format active UST tracing path in rotate session command");
4730 ret = -LTTNG_ERR_UNK;
4731 goto end;
4732 }
4733 ret = snprintf(session->ust_session->consumer->chunk_path,
4734 PATH_MAX, "/%s-%" PRIu64, datetime,
4735 session->current_archive_id + 1);
4736 if (ret < 0) {
4737 ERR("Failed to format the UST consumer's sub-directory in rotate session command");
4738 ret = -LTTNG_ERR_UNK;
4739 goto end;
4740 }
4741 /*
4742 * Create the new chunk folder, before the rotation begins so we don't
4743 * race with the consumer/tracer activity.
4744 */
4745 ret = domain_mkdir(session->ust_session->consumer, session,
4746 session->ust_session->uid,
4747 session->ust_session->gid);
4748 if (ret) {
4749 ret = -LTTNG_ERR_CREATE_DIR_FAIL;
4750 goto end;
4751 }
4752 ret = ust_app_rotate_session(session, &ust_active);
4753 if (ret != LTTNG_OK) {
4754 goto end;
4755 }
4756 /*
4757 * Handle the case where we did not start a rotation on any channel.
4758 * The consumer will never wake up the rotation thread to perform the
4759 * rename, so we have to do it here while we hold the session and
4760 * session_list locks.
4761 */
4762 if (!session->kernel_session && !ust_active) {
4763 struct lttng_trace_archive_location *location;
4764
4765 session->rotate_pending = false;
4766 session->rotation_state = LTTNG_ROTATION_STATE_COMPLETED;
4767 ret = rename_complete_chunk(session, now);
4768 if (ret < 0) {
4769 ERR("Failed to rename completed rotation chunk");
4770 goto end;
4771 }
4772
4773 /* Ownership of location is transferred. */
4774 location = session_get_trace_archive_location(session);
4775 ret = notification_thread_command_session_rotation_completed(
4776 notification_thread_handle,
4777 session->name,
4778 session->uid,
4779 session->gid,
4780 session->current_archive_id,
4781 location);
4782 if (ret != LTTNG_OK) {
4783 ERR("Failed to notify notification thread that rotation is complete for session %s",
4784 session->name);
4785 }
4786 }
4787 }
4788
4789 if (!session->active) {
4790 session->rotated_after_last_stop = true;
4791 }
4792
4793 if (rotate_return) {
4794 rotate_return->rotation_id = session->current_archive_id;
4795 }
4796
4797 DBG("Cmd rotate session %s, current_archive_id %" PRIu64 " sent",
4798 session->name, session->current_archive_id);
4799 ret = LTTNG_OK;
4800
4801 end:
4802 return ret;
4803 }
4804
4805 /*
4806 * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
4807 *
4808 * Check if the session has finished its rotation.
4809 *
4810 * Return 0 on success or else a LTTNG_ERR code.
4811 */
4812 int cmd_rotate_get_info(struct ltt_session *session,
4813 struct lttng_rotation_get_info_return *info_return,
4814 uint64_t rotation_id)
4815 {
4816 int ret;
4817
4818 assert(session);
4819
4820 DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64, session->name,
4821 session->current_archive_id);
4822
4823 if (session->current_archive_id != rotation_id) {
4824 info_return->status = (int32_t) LTTNG_ROTATION_STATE_EXPIRED;
4825 ret = LTTNG_OK;
4826 goto end;
4827 }
4828
4829 switch (session->rotation_state) {
4830 case LTTNG_ROTATION_STATE_ONGOING:
4831 DBG("Reporting that rotation id %" PRIu64 " of session %s is still pending",
4832 rotation_id, session->name);
4833 break;
4834 case LTTNG_ROTATION_STATE_COMPLETED:
4835 {
4836 char *current_tracing_path_reply;
4837 size_t current_tracing_path_reply_len;
4838
4839 switch (session_get_consumer_destination_type(session)) {
4840 case CONSUMER_DST_LOCAL:
4841 current_tracing_path_reply =
4842 info_return->location.local.absolute_path;
4843 current_tracing_path_reply_len =
4844 sizeof(info_return->location.local.absolute_path);
4845 info_return->location_type =
4846 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL;
4847 break;
4848 case CONSUMER_DST_NET:
4849 current_tracing_path_reply =
4850 info_return->location.relay.relative_path;
4851 current_tracing_path_reply_len =
4852 sizeof(info_return->location.relay.relative_path);
4853 /* Currently the only supported relay protocol. */
4854 info_return->location.relay.protocol =
4855 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP;
4856
4857 ret = lttng_strncpy(info_return->location.relay.host,
4858 session_get_net_consumer_hostname(session),
4859 sizeof(info_return->location.relay.host));
4860 if (ret) {
4861 ERR("Failed to host name to rotate_get_info reply");
4862 info_return->status = LTTNG_ROTATION_STATUS_ERROR;
4863 ret = -LTTNG_ERR_UNK;
4864 goto end;
4865 }
4866
4867 session_get_net_consumer_ports(session,
4868 &info_return->location.relay.ports.control,
4869 &info_return->location.relay.ports.data);
4870 info_return->location_type =
4871 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY;
4872 break;
4873 default:
4874 abort();
4875 }
4876 ret = lttng_strncpy(current_tracing_path_reply,
4877 session->rotation_chunk.current_rotate_path,
4878 current_tracing_path_reply_len);
4879 if (ret) {
4880 ERR("Failed to copy current tracing path to rotate_get_info reply");
4881 info_return->status = LTTNG_ROTATION_STATUS_ERROR;
4882 ret = -LTTNG_ERR_UNK;
4883 goto end;
4884 }
4885
4886 break;
4887 }
4888 case LTTNG_ROTATION_STATE_ERROR:
4889 DBG("Reporting that an error occurred during rotation %" PRIu64 " of session %s",
4890 rotation_id, session->name);
4891 break;
4892 default:
4893 abort();
4894 }
4895
4896 info_return->status = (int32_t) session->rotation_state;
4897 ret = LTTNG_OK;
4898 end:
4899 return ret;
4900 }
4901
4902 /*
4903 * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
4904 *
4905 * Configure the automatic rotation parameters.
4906 * 'activate' to true means activate the rotation schedule type with 'new_value'.
4907 * 'activate' to false means deactivate the rotation schedule and validate that
4908 * 'new_value' has the same value as the currently active value.
4909 *
4910 * Return 0 on success or else a positive LTTNG_ERR code.
4911 */
4912 int cmd_rotation_set_schedule(struct ltt_session *session,
4913 bool activate, enum lttng_rotation_schedule_type schedule_type,
4914 uint64_t new_value,
4915 struct notification_thread_handle *notification_thread_handle)
4916 {
4917 int ret;
4918 uint64_t *parameter_value;
4919
4920 assert(session);
4921
4922 DBG("Cmd rotate set schedule session %s", session->name);
4923
4924 if (session->live_timer || session->snapshot_mode ||
4925 !session->output_traces) {
4926 DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
4927 ret = LTTNG_ERR_ROTATION_NOT_AVAILABLE;
4928 goto end;
4929 }
4930
4931 switch (schedule_type) {
4932 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
4933 parameter_value = &session->rotate_size;
4934 break;
4935 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
4936 parameter_value = &session->rotate_timer_period;
4937 if (new_value >= UINT_MAX) {
4938 DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64 " > %u (UINT_MAX)",
4939 new_value, UINT_MAX);
4940 ret = LTTNG_ERR_INVALID;
4941 goto end;
4942 }
4943 break;
4944 default:
4945 WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
4946 ret = LTTNG_ERR_INVALID;
4947 goto end;
4948 }
4949
4950 /* Improper use of the API. */
4951 if (new_value == -1ULL) {
4952 WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
4953 ret = LTTNG_ERR_INVALID;
4954 goto end;
4955 }
4956
4957 /*
4958 * As indicated in struct ltt_session's comments, a value of == 0 means
4959 * this schedule rotation type is not in use.
4960 *
4961 * Reject the command if we were asked to activate a schedule that was
4962 * already active.
4963 */
4964 if (activate && *parameter_value != 0) {
4965 DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
4966 ret = LTTNG_ERR_ROTATION_SCHEDULE_SET;
4967 goto end;
4968 }
4969
4970 /*
4971 * Reject the command if we were asked to deactivate a schedule that was
4972 * not active.
4973 */
4974 if (!activate && *parameter_value == 0) {
4975 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
4976 ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET;
4977 goto end;
4978 }
4979
4980 /*
4981 * Reject the command if we were asked to deactivate a schedule that
4982 * doesn't exist.
4983 */
4984 if (!activate && *parameter_value != new_value) {
4985 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
4986 ret = LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET;
4987 goto end;
4988 }
4989
4990 *parameter_value = activate ? new_value : 0;
4991
4992 switch (schedule_type) {
4993 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
4994 if (activate && session->active) {
4995 /*
4996 * Only start the timer if the session is active,
4997 * otherwise it will be started when the session starts.
4998 */
4999 ret = sessiond_rotate_timer_start(session, new_value);
5000 if (ret) {
5001 ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
5002 ret = LTTNG_ERR_UNK;
5003 goto end;
5004 }
5005 } else {
5006 ret = sessiond_rotate_timer_stop(session);
5007 if (ret) {
5008 ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
5009 ret = LTTNG_ERR_UNK;
5010 goto end;
5011 }
5012 }
5013 break;
5014 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
5015 if (activate) {
5016 ret = subscribe_session_consumed_size_rotation(session,
5017 new_value, notification_thread_handle);
5018 if (ret) {
5019 ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
5020 ret = LTTNG_ERR_UNK;
5021 goto end;
5022 }
5023 } else {
5024 ret = unsubscribe_session_consumed_size_rotation(session,
5025 notification_thread_handle);
5026 if (ret) {
5027 ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
5028 ret = LTTNG_ERR_UNK;
5029 goto end;
5030 }
5031
5032 }
5033 break;
5034 default:
5035 /* Would have been caught before. */
5036 abort();
5037 }
5038
5039 ret = LTTNG_OK;
5040
5041 goto end;
5042
5043 end:
5044 return ret;
5045 }
5046
5047 /*
5048 * Command ROTATE_GET_CURRENT_PATH from the lttng-ctl library.
5049 *
5050 * Configure the automatic rotation parameters.
5051 * Set to -1ULL to disable them.
5052 *
5053 * Return LTTNG_OK on success or else a LTTNG_ERR code.
5054 */
5055 int cmd_session_get_current_output(struct ltt_session *session,
5056 struct lttng_session_get_current_output_return *output_return)
5057 {
5058 int ret;
5059 const char *path;
5060
5061 if (!session->snapshot_mode) {
5062 if (session->current_archive_id == 0) {
5063 if (session->kernel_session) {
5064 path = session_get_base_path(session);
5065 } else if (session->ust_session) {
5066 path = session_get_base_path(session);
5067 } else {
5068 abort();
5069 }
5070 assert(path);
5071 } else {
5072 path = session->rotation_chunk.active_tracing_path;
5073 }
5074 } else {
5075 /*
5076 * A snapshot session does not have a "current" trace archive
5077 * location.
5078 */
5079 path = "";
5080 }
5081
5082 DBG("Cmd get current output for session %s, returning %s",
5083 session->name, path);
5084
5085 ret = lttng_strncpy(output_return->path,
5086 path,
5087 sizeof(output_return->path));
5088 if (ret) {
5089 ERR("Failed to copy trace output path to session get current output command reply");
5090 ret = -LTTNG_ERR_UNK;
5091 goto end;
5092 }
5093
5094 ret = LTTNG_OK;
5095 end:
5096 return ret;
5097 }
5098
5099 /* Wait for a given path to be removed before continuing. */
5100 static enum lttng_error_code wait_on_path(void *path_data)
5101 {
5102 const char *shm_path = path_data;
5103
5104 DBG("Waiting for the shm path at %s to be removed before completing session destruction",
5105 shm_path);
5106 while (true) {
5107 int ret;
5108 struct stat st;
5109
5110 ret = stat(shm_path, &st);
5111 if (ret) {
5112 if (errno != ENOENT) {
5113 PERROR("stat() returned an error while checking for the existence of the shm path");
5114 } else {
5115 DBG("shm path no longer exists, completing the destruction of session");
5116 }
5117 break;
5118 } else {
5119 if (!S_ISDIR(st.st_mode)) {
5120 ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
5121 shm_path);
5122 break;
5123 }
5124 }
5125 usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US);
5126 }
5127 return LTTNG_OK;
5128 }
5129
5130 /*
5131 * Returns a pointer to a handler to run on completion of a command.
5132 * Returns NULL if no handler has to be run for the last command executed.
5133 */
5134 const struct cmd_completion_handler *cmd_pop_completion_handler(void)
5135 {
5136 struct cmd_completion_handler *handler = current_completion_handler;
5137
5138 current_completion_handler = NULL;
5139 return handler;
5140 }
5141
5142 /*
5143 * Init command subsystem.
5144 */
5145 void cmd_init(void)
5146 {
5147 /*
5148 * Set network sequence index to 1 for streams to match a relayd
5149 * socket on the consumer side.
5150 */
5151 pthread_mutex_lock(&relayd_net_seq_idx_lock);
5152 relayd_net_seq_idx = 1;
5153 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
5154
5155 DBG("Command subsystem initialized");
5156 }
LTTng tools - Deliverables
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