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