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Add support for "full" star globbing patterns in event names and filters
[deliverable/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
25 #include <common/defaults.h>
26 #include <common/common.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28 #include <common/relayd/relayd.h>
29 #include <common/utils.h>
30 #include <common/compat/string.h>
31 #include <common/kernel-ctl/kernel-ctl.h>
32 #include <common/string-utils/string-utils.h>
33
34 #include "channel.h"
35 #include "consumer.h"
36 #include "event.h"
37 #include "health-sessiond.h"
38 #include "kernel.h"
39 #include "kernel-consumer.h"
40 #include "lttng-sessiond.h"
41 #include "utils.h"
42 #include "syscall.h"
43 #include "agent.h"
44 #include "buffer-registry.h"
45
46 #include "cmd.h"
47
48 /*
49 * Used to keep a unique index for each relayd socket created where this value
50 * is associated with streams on the consumer so it can match the right relayd
51 * to send to. It must be accessed with the relayd_net_seq_idx_lock
52 * held.
53 */
54 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
55 static uint64_t relayd_net_seq_idx;
56
57 static int validate_ust_event_name(const char *);
58 static int cmd_enable_event_internal(struct ltt_session *session,
59 struct lttng_domain *domain,
60 char *channel_name, struct lttng_event *event,
61 char *filter_expression,
62 struct lttng_filter_bytecode *filter,
63 struct lttng_event_exclusion *exclusion,
64 int wpipe);
65
66 /*
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
69 */
70 static int build_network_session_path(char *dst, size_t size,
71 struct ltt_session *session)
72 {
73 int ret, kdata_port, udata_port;
74 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
75 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
76
77 assert(session);
78 assert(dst);
79
80 memset(tmp_urls, 0, sizeof(tmp_urls));
81 memset(tmp_uurl, 0, sizeof(tmp_uurl));
82
83 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
84
85 if (session->kernel_session && session->kernel_session->consumer) {
86 kuri = &session->kernel_session->consumer->dst.net.control;
87 kdata_port = session->kernel_session->consumer->dst.net.data.port;
88 }
89
90 if (session->ust_session && session->ust_session->consumer) {
91 uuri = &session->ust_session->consumer->dst.net.control;
92 udata_port = session->ust_session->consumer->dst.net.data.port;
93 }
94
95 if (uuri == NULL && kuri == NULL) {
96 uri = &session->consumer->dst.net.control;
97 kdata_port = session->consumer->dst.net.data.port;
98 } else if (kuri && uuri) {
99 ret = uri_compare(kuri, uuri);
100 if (ret) {
101 /* Not Equal */
102 uri = kuri;
103 /* Build uuri URL string */
104 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
105 if (ret < 0) {
106 goto error;
107 }
108 } else {
109 uri = kuri;
110 }
111 } else if (kuri && uuri == NULL) {
112 uri = kuri;
113 } else if (uuri && kuri == NULL) {
114 uri = uuri;
115 }
116
117 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
118 if (ret < 0) {
119 goto error;
120 }
121
122 /*
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 * to print.
125 */
126 if (*tmp_uurl != '\0') {
127 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls, kdata_port, tmp_uurl, udata_port);
129 } else {
130 int dport;
131 if (kuri || (!kuri && !uuri)) {
132 dport = kdata_port;
133 } else {
134 /* No kernel URI, use the UST port. */
135 dport = udata_port;
136 }
137 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
138 }
139
140 error:
141 return ret;
142 }
143
144 /*
145 * Get run-time attributes if the session has been started (discarded events,
146 * lost packets).
147 */
148 static int get_kernel_runtime_stats(struct ltt_session *session,
149 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
150 uint64_t *lost_packets)
151 {
152 int ret;
153
154 if (!session->has_been_started) {
155 ret = 0;
156 *discarded_events = 0;
157 *lost_packets = 0;
158 goto end;
159 }
160
161 ret = consumer_get_discarded_events(session->id, kchan->fd,
162 session->kernel_session->consumer,
163 discarded_events);
164 if (ret < 0) {
165 goto end;
166 }
167
168 ret = consumer_get_lost_packets(session->id, kchan->fd,
169 session->kernel_session->consumer,
170 lost_packets);
171 if (ret < 0) {
172 goto end;
173 }
174
175 end:
176 return ret;
177 }
178
179 /*
180 * Get run-time attributes if the session has been started (discarded events,
181 * lost packets).
182 */
183 static int get_ust_runtime_stats(struct ltt_session *session,
184 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
185 uint64_t *lost_packets)
186 {
187 int ret;
188 struct ltt_ust_session *usess;
189
190 if (!discarded_events || !lost_packets) {
191 ret = -1;
192 goto end;
193 }
194
195 usess = session->ust_session;
196 assert(discarded_events);
197 assert(lost_packets);
198
199 if (!usess || !session->has_been_started) {
200 *discarded_events = 0;
201 *lost_packets = 0;
202 ret = 0;
203 goto end;
204 }
205
206 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
207 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
208 &usess->buffer_reg_uid_list,
209 usess->consumer, uchan->id,
210 uchan->attr.overwrite,
211 discarded_events,
212 lost_packets);
213 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
214 ret = ust_app_pid_get_channel_runtime_stats(usess,
215 uchan, usess->consumer,
216 uchan->attr.overwrite,
217 discarded_events,
218 lost_packets);
219 if (ret < 0) {
220 goto end;
221 }
222 *discarded_events += uchan->per_pid_closed_app_discarded;
223 *lost_packets += uchan->per_pid_closed_app_lost;
224 } else {
225 ERR("Unsupported buffer type");
226 assert(0);
227 ret = -1;
228 goto end;
229 }
230
231 end:
232 return ret;
233 }
234
235 /*
236 * Fill lttng_channel array of all channels.
237 */
238 static void list_lttng_channels(enum lttng_domain_type domain,
239 struct ltt_session *session, struct lttng_channel *channels,
240 struct lttcomm_channel_extended *chan_exts)
241 {
242 int i = 0, ret;
243 struct ltt_kernel_channel *kchan;
244
245 DBG("Listing channels for session %s", session->name);
246
247 switch (domain) {
248 case LTTNG_DOMAIN_KERNEL:
249 /* Kernel channels */
250 if (session->kernel_session != NULL) {
251 cds_list_for_each_entry(kchan,
252 &session->kernel_session->channel_list.head, list) {
253 uint64_t discarded_events, lost_packets;
254
255 ret = get_kernel_runtime_stats(session, kchan,
256 &discarded_events, &lost_packets);
257 if (ret < 0) {
258 goto end;
259 }
260 /* Copy lttng_channel struct to array */
261 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
262 channels[i].enabled = kchan->enabled;
263 chan_exts[i].discarded_events =
264 discarded_events;
265 chan_exts[i].lost_packets = lost_packets;
266 i++;
267 }
268 }
269 break;
270 case LTTNG_DOMAIN_UST:
271 {
272 struct lttng_ht_iter iter;
273 struct ltt_ust_channel *uchan;
274
275 rcu_read_lock();
276 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
277 &iter.iter, uchan, node.node) {
278 uint64_t discarded_events = 0, lost_packets = 0;
279
280 if (lttng_strncpy(channels[i].name, uchan->name,
281 LTTNG_SYMBOL_NAME_LEN)) {
282 break;
283 }
284 channels[i].attr.overwrite = uchan->attr.overwrite;
285 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
286 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
287 channels[i].attr.switch_timer_interval =
288 uchan->attr.switch_timer_interval;
289 channels[i].attr.read_timer_interval =
290 uchan->attr.read_timer_interval;
291 channels[i].enabled = uchan->enabled;
292 channels[i].attr.tracefile_size = uchan->tracefile_size;
293 channels[i].attr.tracefile_count = uchan->tracefile_count;
294
295 /*
296 * Map enum lttng_ust_output to enum lttng_event_output.
297 */
298 switch (uchan->attr.output) {
299 case LTTNG_UST_MMAP:
300 channels[i].attr.output = LTTNG_EVENT_MMAP;
301 break;
302 default:
303 /*
304 * LTTNG_UST_MMAP is the only supported UST
305 * output mode.
306 */
307 assert(0);
308 break;
309 }
310
311 ret = get_ust_runtime_stats(session, uchan,
312 &discarded_events, &lost_packets);
313 if (ret < 0) {
314 break;
315 }
316 chan_exts[i].discarded_events = discarded_events;
317 chan_exts[i].lost_packets = lost_packets;
318 i++;
319 }
320 rcu_read_unlock();
321 break;
322 }
323 default:
324 break;
325 }
326
327 end:
328 return;
329 }
330
331 static void increment_extended_len(const char *filter_expression,
332 struct lttng_event_exclusion *exclusion, size_t *extended_len)
333 {
334 *extended_len += sizeof(struct lttcomm_event_extended_header);
335
336 if (filter_expression) {
337 *extended_len += strlen(filter_expression) + 1;
338 }
339
340 if (exclusion) {
341 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
342 }
343 }
344
345 static void append_extended_info(const char *filter_expression,
346 struct lttng_event_exclusion *exclusion, void **extended_at)
347 {
348 struct lttcomm_event_extended_header extended_header;
349 size_t filter_len = 0;
350 size_t nb_exclusions = 0;
351
352 if (filter_expression) {
353 filter_len = strlen(filter_expression) + 1;
354 }
355
356 if (exclusion) {
357 nb_exclusions = exclusion->count;
358 }
359
360 /* Set header fields */
361 extended_header.filter_len = filter_len;
362 extended_header.nb_exclusions = nb_exclusions;
363
364 /* Copy header */
365 memcpy(*extended_at, &extended_header, sizeof(extended_header));
366 *extended_at += sizeof(extended_header);
367
368 /* Copy filter string */
369 if (filter_expression) {
370 memcpy(*extended_at, filter_expression, filter_len);
371 *extended_at += filter_len;
372 }
373
374 /* Copy exclusion names */
375 if (exclusion) {
376 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
377
378 memcpy(*extended_at, &exclusion->names, len);
379 *extended_at += len;
380 }
381 }
382
383 /*
384 * Create a list of agent domain events.
385 *
386 * Return number of events in list on success or else a negative value.
387 */
388 static int list_lttng_agent_events(struct agent *agt,
389 struct lttng_event **events, size_t *total_size)
390 {
391 int i = 0, ret = 0;
392 unsigned int nb_event = 0;
393 struct agent_event *event;
394 struct lttng_event *tmp_events;
395 struct lttng_ht_iter iter;
396 size_t extended_len = 0;
397 void *extended_at;
398
399 assert(agt);
400 assert(events);
401
402 DBG3("Listing agent events");
403
404 rcu_read_lock();
405 nb_event = lttng_ht_get_count(agt->events);
406 rcu_read_unlock();
407 if (nb_event == 0) {
408 ret = nb_event;
409 *total_size = 0;
410 goto error;
411 }
412
413 /* Compute required extended infos size */
414 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
415
416 /*
417 * This is only valid because the commands which add events are
418 * processed in the same thread as the listing.
419 */
420 rcu_read_lock();
421 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
422 increment_extended_len(event->filter_expression, NULL,
423 &extended_len);
424 }
425 rcu_read_unlock();
426
427 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
428 tmp_events = zmalloc(*total_size);
429 if (!tmp_events) {
430 PERROR("zmalloc agent events session");
431 ret = -LTTNG_ERR_FATAL;
432 goto error;
433 }
434
435 extended_at = ((uint8_t *) tmp_events) +
436 nb_event * sizeof(struct lttng_event);
437
438 rcu_read_lock();
439 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
440 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
441 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
442 tmp_events[i].enabled = event->enabled;
443 tmp_events[i].loglevel = event->loglevel_value;
444 tmp_events[i].loglevel_type = event->loglevel_type;
445 i++;
446
447 /* Append extended info */
448 append_extended_info(event->filter_expression, NULL,
449 &extended_at);
450 }
451 rcu_read_unlock();
452
453 *events = tmp_events;
454 ret = nb_event;
455
456 error:
457 assert(nb_event == i);
458 return ret;
459 }
460
461 /*
462 * Create a list of ust global domain events.
463 */
464 static int list_lttng_ust_global_events(char *channel_name,
465 struct ltt_ust_domain_global *ust_global,
466 struct lttng_event **events, size_t *total_size)
467 {
468 int i = 0, ret = 0;
469 unsigned int nb_event = 0;
470 struct lttng_ht_iter iter;
471 struct lttng_ht_node_str *node;
472 struct ltt_ust_channel *uchan;
473 struct ltt_ust_event *uevent;
474 struct lttng_event *tmp;
475 size_t extended_len = 0;
476 void *extended_at;
477
478 DBG("Listing UST global events for channel %s", channel_name);
479
480 rcu_read_lock();
481
482 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
483 node = lttng_ht_iter_get_node_str(&iter);
484 if (node == NULL) {
485 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
486 goto end;
487 }
488
489 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
490
491 nb_event = lttng_ht_get_count(uchan->events);
492 if (nb_event == 0) {
493 ret = nb_event;
494 *total_size = 0;
495 goto end;
496 }
497
498 DBG3("Listing UST global %d events", nb_event);
499
500 /* Compute required extended infos size */
501 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
502 if (uevent->internal) {
503 nb_event--;
504 continue;
505 }
506
507 increment_extended_len(uevent->filter_expression,
508 uevent->exclusion, &extended_len);
509 }
510 if (nb_event == 0) {
511 /* All events are internal, skip. */
512 ret = 0;
513 *total_size = 0;
514 goto end;
515 }
516
517 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
518 tmp = zmalloc(*total_size);
519 if (tmp == NULL) {
520 ret = -LTTNG_ERR_FATAL;
521 goto end;
522 }
523
524 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
525
526 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
527 if (uevent->internal) {
528 /* This event should remain hidden from clients */
529 continue;
530 }
531 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
532 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
533 tmp[i].enabled = uevent->enabled;
534
535 switch (uevent->attr.instrumentation) {
536 case LTTNG_UST_TRACEPOINT:
537 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
538 break;
539 case LTTNG_UST_PROBE:
540 tmp[i].type = LTTNG_EVENT_PROBE;
541 break;
542 case LTTNG_UST_FUNCTION:
543 tmp[i].type = LTTNG_EVENT_FUNCTION;
544 break;
545 }
546
547 tmp[i].loglevel = uevent->attr.loglevel;
548 switch (uevent->attr.loglevel_type) {
549 case LTTNG_UST_LOGLEVEL_ALL:
550 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
551 break;
552 case LTTNG_UST_LOGLEVEL_RANGE:
553 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
554 break;
555 case LTTNG_UST_LOGLEVEL_SINGLE:
556 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
557 break;
558 }
559 if (uevent->filter) {
560 tmp[i].filter = 1;
561 }
562 if (uevent->exclusion) {
563 tmp[i].exclusion = 1;
564 }
565 i++;
566
567 /* Append extended info */
568 append_extended_info(uevent->filter_expression,
569 uevent->exclusion, &extended_at);
570 }
571
572 ret = nb_event;
573 *events = tmp;
574 end:
575 rcu_read_unlock();
576 return ret;
577 }
578
579 /*
580 * Fill lttng_event array of all kernel events in the channel.
581 */
582 static int list_lttng_kernel_events(char *channel_name,
583 struct ltt_kernel_session *kernel_session,
584 struct lttng_event **events, size_t *total_size)
585 {
586 int i = 0, ret;
587 unsigned int nb_event;
588 struct ltt_kernel_event *event;
589 struct ltt_kernel_channel *kchan;
590 size_t extended_len = 0;
591 void *extended_at;
592
593 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
594 if (kchan == NULL) {
595 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
596 goto error;
597 }
598
599 nb_event = kchan->event_count;
600
601 DBG("Listing events for channel %s", kchan->channel->name);
602
603 if (nb_event == 0) {
604 *total_size = 0;
605 *events = NULL;
606 goto end;
607 }
608
609 /* Compute required extended infos size */
610 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
611 increment_extended_len(event->filter_expression, NULL,
612 &extended_len);
613 }
614
615 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
616 *events = zmalloc(*total_size);
617 if (*events == NULL) {
618 ret = LTTNG_ERR_FATAL;
619 goto error;
620 }
621
622 extended_at = ((void *) *events) +
623 nb_event * sizeof(struct lttng_event);
624
625 /* Kernel channels */
626 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
627 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
628 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
629 (*events)[i].enabled = event->enabled;
630 (*events)[i].filter =
631 (unsigned char) !!event->filter_expression;
632
633 switch (event->event->instrumentation) {
634 case LTTNG_KERNEL_TRACEPOINT:
635 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
636 break;
637 case LTTNG_KERNEL_KRETPROBE:
638 (*events)[i].type = LTTNG_EVENT_FUNCTION;
639 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
640 sizeof(struct lttng_kernel_kprobe));
641 break;
642 case LTTNG_KERNEL_KPROBE:
643 (*events)[i].type = LTTNG_EVENT_PROBE;
644 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
645 sizeof(struct lttng_kernel_kprobe));
646 break;
647 case LTTNG_KERNEL_FUNCTION:
648 (*events)[i].type = LTTNG_EVENT_FUNCTION;
649 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
650 sizeof(struct lttng_kernel_function));
651 break;
652 case LTTNG_KERNEL_NOOP:
653 (*events)[i].type = LTTNG_EVENT_NOOP;
654 break;
655 case LTTNG_KERNEL_SYSCALL:
656 (*events)[i].type = LTTNG_EVENT_SYSCALL;
657 break;
658 case LTTNG_KERNEL_ALL:
659 assert(0);
660 break;
661 }
662 i++;
663
664 /* Append extended info */
665 append_extended_info(event->filter_expression, NULL,
666 &extended_at);
667 }
668
669 end:
670 return nb_event;
671
672 error:
673 /* Negate the error code to differentiate the size from an error */
674 return -ret;
675 }
676
677 /*
678 * Add URI so the consumer output object. Set the correct path depending on the
679 * domain adding the default trace directory.
680 */
681 static int add_uri_to_consumer(struct consumer_output *consumer,
682 struct lttng_uri *uri, enum lttng_domain_type domain,
683 const char *session_name)
684 {
685 int ret = LTTNG_OK;
686 const char *default_trace_dir;
687
688 assert(uri);
689
690 if (consumer == NULL) {
691 DBG("No consumer detected. Don't add URI. Stopping.");
692 ret = LTTNG_ERR_NO_CONSUMER;
693 goto error;
694 }
695
696 switch (domain) {
697 case LTTNG_DOMAIN_KERNEL:
698 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
699 break;
700 case LTTNG_DOMAIN_UST:
701 default_trace_dir = DEFAULT_UST_TRACE_DIR;
702 break;
703 default:
704 /*
705 * This case is possible is we try to add the URI to the global tracing
706 * session consumer object which in this case there is no subdir.
707 */
708 default_trace_dir = "";
709 }
710
711 switch (uri->dtype) {
712 case LTTNG_DST_IPV4:
713 case LTTNG_DST_IPV6:
714 DBG2("Setting network URI to consumer");
715
716 if (consumer->type == CONSUMER_DST_NET) {
717 if ((uri->stype == LTTNG_STREAM_CONTROL &&
718 consumer->dst.net.control_isset) ||
719 (uri->stype == LTTNG_STREAM_DATA &&
720 consumer->dst.net.data_isset)) {
721 ret = LTTNG_ERR_URL_EXIST;
722 goto error;
723 }
724 } else {
725 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
726 }
727
728 consumer->type = CONSUMER_DST_NET;
729
730 /* Set URI into consumer output object */
731 ret = consumer_set_network_uri(consumer, uri);
732 if (ret < 0) {
733 ret = -ret;
734 goto error;
735 } else if (ret == 1) {
736 /*
737 * URI was the same in the consumer so we do not append the subdir
738 * again so to not duplicate output dir.
739 */
740 ret = LTTNG_OK;
741 goto error;
742 }
743
744 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
745 ret = consumer_set_subdir(consumer, session_name);
746 if (ret < 0) {
747 ret = LTTNG_ERR_FATAL;
748 goto error;
749 }
750 }
751
752 if (uri->stype == LTTNG_STREAM_CONTROL) {
753 /* On a new subdir, reappend the default trace dir. */
754 strncat(consumer->subdir, default_trace_dir,
755 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
756 DBG3("Append domain trace name to subdir %s", consumer->subdir);
757 }
758
759 break;
760 case LTTNG_DST_PATH:
761 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
762 memset(consumer->dst.trace_path, 0,
763 sizeof(consumer->dst.trace_path));
764 /* Explicit length checks for strcpy and strcat. */
765 if (strlen(uri->dst.path) + strlen(default_trace_dir)
766 >= sizeof(consumer->dst.trace_path)) {
767 ret = LTTNG_ERR_FATAL;
768 goto error;
769 }
770 strcpy(consumer->dst.trace_path, uri->dst.path);
771 /* Append default trace dir */
772 strcat(consumer->dst.trace_path, default_trace_dir);
773 /* Flag consumer as local. */
774 consumer->type = CONSUMER_DST_LOCAL;
775 break;
776 }
777
778 ret = LTTNG_OK;
779
780 error:
781 return ret;
782 }
783
784 /*
785 * Init tracing by creating trace directory and sending fds kernel consumer.
786 */
787 static int init_kernel_tracing(struct ltt_kernel_session *session)
788 {
789 int ret = 0;
790 struct lttng_ht_iter iter;
791 struct consumer_socket *socket;
792
793 assert(session);
794
795 rcu_read_lock();
796
797 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
798 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
799 socket, node.node) {
800 pthread_mutex_lock(socket->lock);
801 ret = kernel_consumer_send_session(socket, session);
802 pthread_mutex_unlock(socket->lock);
803 if (ret < 0) {
804 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
805 goto error;
806 }
807 }
808 }
809
810 error:
811 rcu_read_unlock();
812 return ret;
813 }
814
815 /*
816 * Create a socket to the relayd using the URI.
817 *
818 * On success, the relayd_sock pointer is set to the created socket.
819 * Else, it's stays untouched and a lttcomm error code is returned.
820 */
821 static int create_connect_relayd(struct lttng_uri *uri,
822 struct lttcomm_relayd_sock **relayd_sock,
823 struct consumer_output *consumer)
824 {
825 int ret;
826 struct lttcomm_relayd_sock *rsock;
827
828 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
829 RELAYD_VERSION_COMM_MINOR);
830 if (!rsock) {
831 ret = LTTNG_ERR_FATAL;
832 goto error;
833 }
834
835 /*
836 * Connect to relayd so we can proceed with a session creation. This call
837 * can possibly block for an arbitrary amount of time to set the health
838 * state to be in poll execution.
839 */
840 health_poll_entry();
841 ret = relayd_connect(rsock);
842 health_poll_exit();
843 if (ret < 0) {
844 ERR("Unable to reach lttng-relayd");
845 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
846 goto free_sock;
847 }
848
849 /* Create socket for control stream. */
850 if (uri->stype == LTTNG_STREAM_CONTROL) {
851 DBG3("Creating relayd stream socket from URI");
852
853 /* Check relayd version */
854 ret = relayd_version_check(rsock);
855 if (ret < 0) {
856 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
857 goto close_sock;
858 }
859 consumer->relay_major_version = rsock->major;
860 consumer->relay_minor_version = rsock->minor;
861 } else if (uri->stype == LTTNG_STREAM_DATA) {
862 DBG3("Creating relayd data socket from URI");
863 } else {
864 /* Command is not valid */
865 ERR("Relayd invalid stream type: %d", uri->stype);
866 ret = LTTNG_ERR_INVALID;
867 goto close_sock;
868 }
869
870 *relayd_sock = rsock;
871
872 return LTTNG_OK;
873
874 close_sock:
875 /* The returned value is not useful since we are on an error path. */
876 (void) relayd_close(rsock);
877 free_sock:
878 free(rsock);
879 error:
880 return ret;
881 }
882
883 /*
884 * Connect to the relayd using URI and send the socket to the right consumer.
885 */
886 static int send_consumer_relayd_socket(enum lttng_domain_type domain,
887 unsigned int session_id, struct lttng_uri *relayd_uri,
888 struct consumer_output *consumer,
889 struct consumer_socket *consumer_sock,
890 char *session_name, char *hostname, int session_live_timer)
891 {
892 int ret;
893 struct lttcomm_relayd_sock *rsock = NULL;
894
895 /* Connect to relayd and make version check if uri is the control. */
896 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
897 if (ret != LTTNG_OK) {
898 goto error;
899 }
900 assert(rsock);
901
902 /* Set the network sequence index if not set. */
903 if (consumer->net_seq_index == (uint64_t) -1ULL) {
904 pthread_mutex_lock(&relayd_net_seq_idx_lock);
905 /*
906 * Increment net_seq_idx because we are about to transfer the
907 * new relayd socket to the consumer.
908 * Assign unique key so the consumer can match streams.
909 */
910 consumer->net_seq_index = ++relayd_net_seq_idx;
911 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
912 }
913
914 /* Send relayd socket to consumer. */
915 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
916 relayd_uri->stype, session_id,
917 session_name, hostname, session_live_timer);
918 if (ret < 0) {
919 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
920 goto close_sock;
921 }
922
923 /* Flag that the corresponding socket was sent. */
924 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
925 consumer_sock->control_sock_sent = 1;
926 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
927 consumer_sock->data_sock_sent = 1;
928 }
929
930 ret = LTTNG_OK;
931
932 /*
933 * Close socket which was dup on the consumer side. The session daemon does
934 * NOT keep track of the relayd socket(s) once transfer to the consumer.
935 */
936
937 close_sock:
938 (void) relayd_close(rsock);
939 free(rsock);
940
941 error:
942 if (ret != LTTNG_OK) {
943 /*
944 * The consumer output for this session should not be used anymore
945 * since the relayd connection failed thus making any tracing or/and
946 * streaming not usable.
947 */
948 consumer->enabled = 0;
949 }
950 return ret;
951 }
952
953 /*
954 * Send both relayd sockets to a specific consumer and domain. This is a
955 * helper function to facilitate sending the information to the consumer for a
956 * session.
957 */
958 static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
959 unsigned int session_id, struct consumer_output *consumer,
960 struct consumer_socket *sock, char *session_name,
961 char *hostname, int session_live_timer)
962 {
963 int ret = LTTNG_OK;
964
965 assert(consumer);
966 assert(sock);
967
968 /* Sending control relayd socket. */
969 if (!sock->control_sock_sent) {
970 ret = send_consumer_relayd_socket(domain, session_id,
971 &consumer->dst.net.control, consumer, sock,
972 session_name, hostname, session_live_timer);
973 if (ret != LTTNG_OK) {
974 goto error;
975 }
976 }
977
978 /* Sending data relayd socket. */
979 if (!sock->data_sock_sent) {
980 ret = send_consumer_relayd_socket(domain, session_id,
981 &consumer->dst.net.data, consumer, sock,
982 session_name, hostname, session_live_timer);
983 if (ret != LTTNG_OK) {
984 goto error;
985 }
986 }
987
988 error:
989 return ret;
990 }
991
992 /*
993 * Setup relayd connections for a tracing session. First creates the socket to
994 * the relayd and send them to the right domain consumer. Consumer type MUST be
995 * network.
996 */
997 int cmd_setup_relayd(struct ltt_session *session)
998 {
999 int ret = LTTNG_OK;
1000 struct ltt_ust_session *usess;
1001 struct ltt_kernel_session *ksess;
1002 struct consumer_socket *socket;
1003 struct lttng_ht_iter iter;
1004
1005 assert(session);
1006
1007 usess = session->ust_session;
1008 ksess = session->kernel_session;
1009
1010 DBG("Setting relayd for session %s", session->name);
1011
1012 rcu_read_lock();
1013
1014 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1015 && usess->consumer->enabled) {
1016 /* For each consumer socket, send relayd sockets */
1017 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1018 socket, node.node) {
1019 pthread_mutex_lock(socket->lock);
1020 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
1021 usess->consumer, socket,
1022 session->name, session->hostname,
1023 session->live_timer);
1024 pthread_mutex_unlock(socket->lock);
1025 if (ret != LTTNG_OK) {
1026 goto error;
1027 }
1028 /* Session is now ready for network streaming. */
1029 session->net_handle = 1;
1030 }
1031 session->consumer->relay_major_version =
1032 usess->consumer->relay_major_version;
1033 session->consumer->relay_minor_version =
1034 usess->consumer->relay_minor_version;
1035 }
1036
1037 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1038 && ksess->consumer->enabled) {
1039 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1040 socket, node.node) {
1041 pthread_mutex_lock(socket->lock);
1042 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
1043 ksess->consumer, socket,
1044 session->name, session->hostname,
1045 session->live_timer);
1046 pthread_mutex_unlock(socket->lock);
1047 if (ret != LTTNG_OK) {
1048 goto error;
1049 }
1050 /* Session is now ready for network streaming. */
1051 session->net_handle = 1;
1052 }
1053 session->consumer->relay_major_version =
1054 ksess->consumer->relay_major_version;
1055 session->consumer->relay_minor_version =
1056 ksess->consumer->relay_minor_version;
1057 }
1058
1059 error:
1060 rcu_read_unlock();
1061 return ret;
1062 }
1063
1064 /*
1065 * Start a kernel session by opening all necessary streams.
1066 */
1067 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1068 {
1069 int ret;
1070 struct ltt_kernel_channel *kchan;
1071
1072 /* Open kernel metadata */
1073 if (ksess->metadata == NULL && ksess->output_traces) {
1074 ret = kernel_open_metadata(ksess);
1075 if (ret < 0) {
1076 ret = LTTNG_ERR_KERN_META_FAIL;
1077 goto error;
1078 }
1079 }
1080
1081 /* Open kernel metadata stream */
1082 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
1083 ret = kernel_open_metadata_stream(ksess);
1084 if (ret < 0) {
1085 ERR("Kernel create metadata stream failed");
1086 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1087 goto error;
1088 }
1089 }
1090
1091 /* For each channel */
1092 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1093 if (kchan->stream_count == 0) {
1094 ret = kernel_open_channel_stream(kchan);
1095 if (ret < 0) {
1096 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1097 goto error;
1098 }
1099 /* Update the stream global counter */
1100 ksess->stream_count_global += ret;
1101 }
1102 }
1103
1104 /* Setup kernel consumer socket and send fds to it */
1105 ret = init_kernel_tracing(ksess);
1106 if (ret != 0) {
1107 ret = LTTNG_ERR_KERN_START_FAIL;
1108 goto error;
1109 }
1110
1111 /* This start the kernel tracing */
1112 ret = kernel_start_session(ksess);
1113 if (ret < 0) {
1114 ret = LTTNG_ERR_KERN_START_FAIL;
1115 goto error;
1116 }
1117
1118 /* Quiescent wait after starting trace */
1119 kernel_wait_quiescent(kernel_tracer_fd);
1120
1121 ksess->active = 1;
1122
1123 ret = LTTNG_OK;
1124
1125 error:
1126 return ret;
1127 }
1128
1129 /*
1130 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1131 */
1132 int cmd_disable_channel(struct ltt_session *session,
1133 enum lttng_domain_type domain, char *channel_name)
1134 {
1135 int ret;
1136 struct ltt_ust_session *usess;
1137
1138 usess = session->ust_session;
1139
1140 rcu_read_lock();
1141
1142 switch (domain) {
1143 case LTTNG_DOMAIN_KERNEL:
1144 {
1145 ret = channel_kernel_disable(session->kernel_session,
1146 channel_name);
1147 if (ret != LTTNG_OK) {
1148 goto error;
1149 }
1150
1151 kernel_wait_quiescent(kernel_tracer_fd);
1152 break;
1153 }
1154 case LTTNG_DOMAIN_UST:
1155 {
1156 struct ltt_ust_channel *uchan;
1157 struct lttng_ht *chan_ht;
1158
1159 chan_ht = usess->domain_global.channels;
1160
1161 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1162 if (uchan == NULL) {
1163 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1164 goto error;
1165 }
1166
1167 ret = channel_ust_disable(usess, uchan);
1168 if (ret != LTTNG_OK) {
1169 goto error;
1170 }
1171 break;
1172 }
1173 default:
1174 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1175 goto error;
1176 }
1177
1178 ret = LTTNG_OK;
1179
1180 error:
1181 rcu_read_unlock();
1182 return ret;
1183 }
1184
1185 /*
1186 * Command LTTNG_TRACK_PID processed by the client thread.
1187 *
1188 * Called with session lock held.
1189 */
1190 int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1191 int pid)
1192 {
1193 int ret;
1194
1195 rcu_read_lock();
1196
1197 switch (domain) {
1198 case LTTNG_DOMAIN_KERNEL:
1199 {
1200 struct ltt_kernel_session *ksess;
1201
1202 ksess = session->kernel_session;
1203
1204 ret = kernel_track_pid(ksess, pid);
1205 if (ret != LTTNG_OK) {
1206 goto error;
1207 }
1208
1209 kernel_wait_quiescent(kernel_tracer_fd);
1210 break;
1211 }
1212 case LTTNG_DOMAIN_UST:
1213 {
1214 struct ltt_ust_session *usess;
1215
1216 usess = session->ust_session;
1217
1218 ret = trace_ust_track_pid(usess, pid);
1219 if (ret != LTTNG_OK) {
1220 goto error;
1221 }
1222 break;
1223 }
1224 default:
1225 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1226 goto error;
1227 }
1228
1229 ret = LTTNG_OK;
1230
1231 error:
1232 rcu_read_unlock();
1233 return ret;
1234 }
1235
1236 /*
1237 * Command LTTNG_UNTRACK_PID processed by the client thread.
1238 *
1239 * Called with session lock held.
1240 */
1241 int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1242 int pid)
1243 {
1244 int ret;
1245
1246 rcu_read_lock();
1247
1248 switch (domain) {
1249 case LTTNG_DOMAIN_KERNEL:
1250 {
1251 struct ltt_kernel_session *ksess;
1252
1253 ksess = session->kernel_session;
1254
1255 ret = kernel_untrack_pid(ksess, pid);
1256 if (ret != LTTNG_OK) {
1257 goto error;
1258 }
1259
1260 kernel_wait_quiescent(kernel_tracer_fd);
1261 break;
1262 }
1263 case LTTNG_DOMAIN_UST:
1264 {
1265 struct ltt_ust_session *usess;
1266
1267 usess = session->ust_session;
1268
1269 ret = trace_ust_untrack_pid(usess, pid);
1270 if (ret != LTTNG_OK) {
1271 goto error;
1272 }
1273 break;
1274 }
1275 default:
1276 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1277 goto error;
1278 }
1279
1280 ret = LTTNG_OK;
1281
1282 error:
1283 rcu_read_unlock();
1284 return ret;
1285 }
1286
1287 /*
1288 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1289 *
1290 * The wpipe arguments is used as a notifier for the kernel thread.
1291 */
1292 int cmd_enable_channel(struct ltt_session *session,
1293 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
1294 {
1295 int ret;
1296 struct ltt_ust_session *usess = session->ust_session;
1297 struct lttng_ht *chan_ht;
1298 size_t len;
1299
1300 assert(session);
1301 assert(attr);
1302 assert(domain);
1303
1304 len = lttng_strnlen(attr->name, sizeof(attr->name));
1305
1306 /* Validate channel name */
1307 if (attr->name[0] == '.' ||
1308 memchr(attr->name, '/', len) != NULL) {
1309 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1310 goto end;
1311 }
1312
1313 DBG("Enabling channel %s for session %s", attr->name, session->name);
1314
1315 rcu_read_lock();
1316
1317 /*
1318 * Don't try to enable a channel if the session has been started at
1319 * some point in time before. The tracer does not allow it.
1320 */
1321 if (session->has_been_started) {
1322 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1323 goto error;
1324 }
1325
1326 /*
1327 * If the session is a live session, remove the switch timer, the
1328 * live timer does the same thing but sends also synchronisation
1329 * beacons for inactive streams.
1330 */
1331 if (session->live_timer > 0) {
1332 attr->attr.live_timer_interval = session->live_timer;
1333 attr->attr.switch_timer_interval = 0;
1334 }
1335
1336 switch (domain->type) {
1337 case LTTNG_DOMAIN_KERNEL:
1338 {
1339 struct ltt_kernel_channel *kchan;
1340
1341 kchan = trace_kernel_get_channel_by_name(attr->name,
1342 session->kernel_session);
1343 if (kchan == NULL) {
1344 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
1345 if (attr->name[0] != '\0') {
1346 session->kernel_session->has_non_default_channel = 1;
1347 }
1348 } else {
1349 ret = channel_kernel_enable(session->kernel_session, kchan);
1350 }
1351
1352 if (ret != LTTNG_OK) {
1353 goto error;
1354 }
1355
1356 kernel_wait_quiescent(kernel_tracer_fd);
1357 break;
1358 }
1359 case LTTNG_DOMAIN_UST:
1360 case LTTNG_DOMAIN_JUL:
1361 case LTTNG_DOMAIN_LOG4J:
1362 case LTTNG_DOMAIN_PYTHON:
1363 {
1364 struct ltt_ust_channel *uchan;
1365
1366 /*
1367 * FIXME
1368 *
1369 * Current agent implementation limitations force us to allow
1370 * only one channel at once in "agent" subdomains. Each
1371 * subdomain has a default channel name which must be strictly
1372 * adhered to.
1373 */
1374 if (domain->type == LTTNG_DOMAIN_JUL) {
1375 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1376 LTTNG_SYMBOL_NAME_LEN)) {
1377 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1378 goto error;
1379 }
1380 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1381 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1382 LTTNG_SYMBOL_NAME_LEN)) {
1383 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1384 goto error;
1385 }
1386 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1387 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1388 LTTNG_SYMBOL_NAME_LEN)) {
1389 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1390 goto error;
1391 }
1392 }
1393
1394 chan_ht = usess->domain_global.channels;
1395
1396 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1397 if (uchan == NULL) {
1398 ret = channel_ust_create(usess, attr, domain->buf_type);
1399 if (attr->name[0] != '\0') {
1400 usess->has_non_default_channel = 1;
1401 }
1402 } else {
1403 ret = channel_ust_enable(usess, uchan);
1404 }
1405 break;
1406 }
1407 default:
1408 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1409 goto error;
1410 }
1411
1412 error:
1413 rcu_read_unlock();
1414 end:
1415 return ret;
1416 }
1417
1418 /*
1419 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1420 */
1421 int cmd_disable_event(struct ltt_session *session,
1422 enum lttng_domain_type domain, char *channel_name,
1423 struct lttng_event *event)
1424 {
1425 int ret;
1426 char *event_name;
1427
1428 DBG("Disable event command for event \'%s\'", event->name);
1429
1430 event_name = event->name;
1431
1432 /* Error out on unhandled search criteria */
1433 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1434 || event->pid || event->filter || event->exclusion) {
1435 ret = LTTNG_ERR_UNK;
1436 goto error;
1437 }
1438
1439 rcu_read_lock();
1440
1441 switch (domain) {
1442 case LTTNG_DOMAIN_KERNEL:
1443 {
1444 struct ltt_kernel_channel *kchan;
1445 struct ltt_kernel_session *ksess;
1446
1447 ksess = session->kernel_session;
1448
1449 /*
1450 * If a non-default channel has been created in the
1451 * session, explicitely require that -c chan_name needs
1452 * to be provided.
1453 */
1454 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1455 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1456 goto error_unlock;
1457 }
1458
1459 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1460 if (kchan == NULL) {
1461 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1462 goto error_unlock;
1463 }
1464
1465 switch (event->type) {
1466 case LTTNG_EVENT_ALL:
1467 case LTTNG_EVENT_TRACEPOINT:
1468 case LTTNG_EVENT_SYSCALL:
1469 case LTTNG_EVENT_PROBE:
1470 case LTTNG_EVENT_FUNCTION:
1471 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1472 if (event_name[0] == '\0') {
1473 ret = event_kernel_disable_event(kchan,
1474 NULL, event->type);
1475 } else {
1476 ret = event_kernel_disable_event(kchan,
1477 event_name, event->type);
1478 }
1479 if (ret != LTTNG_OK) {
1480 goto error_unlock;
1481 }
1482 break;
1483 default:
1484 ret = LTTNG_ERR_UNK;
1485 goto error_unlock;
1486 }
1487
1488 kernel_wait_quiescent(kernel_tracer_fd);
1489 break;
1490 }
1491 case LTTNG_DOMAIN_UST:
1492 {
1493 struct ltt_ust_channel *uchan;
1494 struct ltt_ust_session *usess;
1495
1496 usess = session->ust_session;
1497
1498 if (validate_ust_event_name(event_name)) {
1499 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1500 goto error_unlock;
1501 }
1502
1503 /*
1504 * If a non-default channel has been created in the
1505 * session, explicitly require that -c chan_name needs
1506 * to be provided.
1507 */
1508 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1509 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1510 goto error_unlock;
1511 }
1512
1513 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1514 channel_name);
1515 if (uchan == NULL) {
1516 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1517 goto error_unlock;
1518 }
1519
1520 switch (event->type) {
1521 case LTTNG_EVENT_ALL:
1522 /*
1523 * An empty event name means that everything
1524 * should be disabled.
1525 */
1526 if (event->name[0] == '\0') {
1527 ret = event_ust_disable_all_tracepoints(usess, uchan);
1528 } else {
1529 ret = event_ust_disable_tracepoint(usess, uchan,
1530 event_name);
1531 }
1532 if (ret != LTTNG_OK) {
1533 goto error_unlock;
1534 }
1535 break;
1536 default:
1537 ret = LTTNG_ERR_UNK;
1538 goto error_unlock;
1539 }
1540
1541 DBG3("Disable UST event %s in channel %s completed", event_name,
1542 channel_name);
1543 break;
1544 }
1545 case LTTNG_DOMAIN_LOG4J:
1546 case LTTNG_DOMAIN_JUL:
1547 case LTTNG_DOMAIN_PYTHON:
1548 {
1549 struct agent *agt;
1550 struct ltt_ust_session *usess = session->ust_session;
1551
1552 assert(usess);
1553
1554 switch (event->type) {
1555 case LTTNG_EVENT_ALL:
1556 break;
1557 default:
1558 ret = LTTNG_ERR_UNK;
1559 goto error_unlock;
1560 }
1561
1562 agt = trace_ust_find_agent(usess, domain);
1563 if (!agt) {
1564 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1565 goto error_unlock;
1566 }
1567 /*
1568 * An empty event name means that everything
1569 * should be disabled.
1570 */
1571 if (event->name[0] == '\0') {
1572 ret = event_agent_disable_all(usess, agt);
1573 } else {
1574 ret = event_agent_disable(usess, agt, event_name);
1575 }
1576 if (ret != LTTNG_OK) {
1577 goto error_unlock;
1578 }
1579
1580 break;
1581 }
1582 default:
1583 ret = LTTNG_ERR_UND;
1584 goto error_unlock;
1585 }
1586
1587 ret = LTTNG_OK;
1588
1589 error_unlock:
1590 rcu_read_unlock();
1591 error:
1592 return ret;
1593 }
1594
1595 /*
1596 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1597 */
1598 int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
1599 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1600 {
1601 int ret, chan_kern_created = 0, chan_ust_created = 0;
1602 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1603
1604 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1605 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1606 app_ctx_name = ctx->u.app_ctx.ctx_name;
1607 }
1608
1609 switch (domain) {
1610 case LTTNG_DOMAIN_KERNEL:
1611 assert(session->kernel_session);
1612
1613 if (session->kernel_session->channel_count == 0) {
1614 /* Create default channel */
1615 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1616 if (ret != LTTNG_OK) {
1617 goto error;
1618 }
1619 chan_kern_created = 1;
1620 }
1621 /* Add kernel context to kernel tracer */
1622 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1623 if (ret != LTTNG_OK) {
1624 goto error;
1625 }
1626 break;
1627 case LTTNG_DOMAIN_JUL:
1628 case LTTNG_DOMAIN_LOG4J:
1629 {
1630 /*
1631 * Validate channel name.
1632 * If no channel name is given and the domain is JUL or LOG4J,
1633 * set it to the appropriate domain-specific channel name. If
1634 * a name is provided but does not match the expexted channel
1635 * name, return an error.
1636 */
1637 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1638 strcmp(channel_name,
1639 DEFAULT_JUL_CHANNEL_NAME)) {
1640 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1641 goto error;
1642 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1643 strcmp(channel_name,
1644 DEFAULT_LOG4J_CHANNEL_NAME)) {
1645 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1646 goto error;
1647 }
1648 /* break is _not_ missing here. */
1649 }
1650 case LTTNG_DOMAIN_UST:
1651 {
1652 struct ltt_ust_session *usess = session->ust_session;
1653 unsigned int chan_count;
1654
1655 assert(usess);
1656
1657 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1658 if (chan_count == 0) {
1659 struct lttng_channel *attr;
1660 /* Create default channel */
1661 attr = channel_new_default_attr(domain, usess->buffer_type);
1662 if (attr == NULL) {
1663 ret = LTTNG_ERR_FATAL;
1664 goto error;
1665 }
1666
1667 ret = channel_ust_create(usess, attr, usess->buffer_type);
1668 if (ret != LTTNG_OK) {
1669 free(attr);
1670 goto error;
1671 }
1672 free(attr);
1673 chan_ust_created = 1;
1674 }
1675
1676 ret = context_ust_add(usess, domain, ctx, channel_name);
1677 free(app_ctx_provider_name);
1678 free(app_ctx_name);
1679 app_ctx_name = NULL;
1680 app_ctx_provider_name = NULL;
1681 if (ret != LTTNG_OK) {
1682 goto error;
1683 }
1684 break;
1685 }
1686 default:
1687 ret = LTTNG_ERR_UND;
1688 goto error;
1689 }
1690
1691 ret = LTTNG_OK;
1692 goto end;
1693
1694 error:
1695 if (chan_kern_created) {
1696 struct ltt_kernel_channel *kchan =
1697 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1698 session->kernel_session);
1699 /* Created previously, this should NOT fail. */
1700 assert(kchan);
1701 kernel_destroy_channel(kchan);
1702 }
1703
1704 if (chan_ust_created) {
1705 struct ltt_ust_channel *uchan =
1706 trace_ust_find_channel_by_name(
1707 session->ust_session->domain_global.channels,
1708 DEFAULT_CHANNEL_NAME);
1709 /* Created previously, this should NOT fail. */
1710 assert(uchan);
1711 /* Remove from the channel list of the session. */
1712 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1713 uchan);
1714 trace_ust_destroy_channel(uchan);
1715 }
1716 end:
1717 free(app_ctx_provider_name);
1718 free(app_ctx_name);
1719 return ret;
1720 }
1721
1722 static inline bool name_starts_with(const char *name, const char *prefix)
1723 {
1724 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1725
1726 return !strncmp(name, prefix, max_cmp_len);
1727 }
1728
1729 /* Perform userspace-specific event name validation */
1730 static int validate_ust_event_name(const char *name)
1731 {
1732 int ret = 0;
1733
1734 if (!name) {
1735 ret = -1;
1736 goto end;
1737 }
1738
1739 /*
1740 * Check name against all internal UST event component namespaces used
1741 * by the agents.
1742 */
1743 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1744 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1745 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1746 ret = -1;
1747 }
1748
1749 end:
1750 return ret;
1751 }
1752
1753 /*
1754 * Internal version of cmd_enable_event() with a supplemental
1755 * "internal_event" flag which is used to enable internal events which should
1756 * be hidden from clients. Such events are used in the agent implementation to
1757 * enable the events through which all "agent" events are funeled.
1758 */
1759 static int _cmd_enable_event(struct ltt_session *session,
1760 struct lttng_domain *domain,
1761 char *channel_name, struct lttng_event *event,
1762 char *filter_expression,
1763 struct lttng_filter_bytecode *filter,
1764 struct lttng_event_exclusion *exclusion,
1765 int wpipe, bool internal_event)
1766 {
1767 int ret = 0, channel_created = 0;
1768 struct lttng_channel *attr = NULL;
1769
1770 assert(session);
1771 assert(event);
1772 assert(channel_name);
1773
1774 /* If we have a filter, we must have its filter expression */
1775 assert(!(!!filter_expression ^ !!filter));
1776
1777 /* Normalize event name as a globbing pattern */
1778 strutils_normalize_star_glob_pattern(event->name);
1779
1780 /* Normalize exclusion names as globbing patterns */
1781 if (exclusion) {
1782 size_t i;
1783
1784 for (i = 0; i < exclusion->count; i++) {
1785 char *name = LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i);
1786
1787 strutils_normalize_star_glob_pattern(name);
1788 }
1789 }
1790
1791 DBG("Enable event command for event \'%s\'", event->name);
1792
1793 rcu_read_lock();
1794
1795 switch (domain->type) {
1796 case LTTNG_DOMAIN_KERNEL:
1797 {
1798 struct ltt_kernel_channel *kchan;
1799
1800 /*
1801 * If a non-default channel has been created in the
1802 * session, explicitely require that -c chan_name needs
1803 * to be provided.
1804 */
1805 if (session->kernel_session->has_non_default_channel
1806 && channel_name[0] == '\0') {
1807 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1808 goto error;
1809 }
1810
1811 kchan = trace_kernel_get_channel_by_name(channel_name,
1812 session->kernel_session);
1813 if (kchan == NULL) {
1814 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1815 LTTNG_BUFFER_GLOBAL);
1816 if (attr == NULL) {
1817 ret = LTTNG_ERR_FATAL;
1818 goto error;
1819 }
1820 if (lttng_strncpy(attr->name, channel_name,
1821 sizeof(attr->name))) {
1822 ret = LTTNG_ERR_INVALID;
1823 goto error;
1824 }
1825
1826 ret = cmd_enable_channel(session, domain, attr, wpipe);
1827 if (ret != LTTNG_OK) {
1828 goto error;
1829 }
1830 channel_created = 1;
1831 }
1832
1833 /* Get the newly created kernel channel pointer */
1834 kchan = trace_kernel_get_channel_by_name(channel_name,
1835 session->kernel_session);
1836 if (kchan == NULL) {
1837 /* This sould not happen... */
1838 ret = LTTNG_ERR_FATAL;
1839 goto error;
1840 }
1841
1842 switch (event->type) {
1843 case LTTNG_EVENT_ALL:
1844 {
1845 char *filter_expression_a = NULL;
1846 struct lttng_filter_bytecode *filter_a = NULL;
1847
1848 /*
1849 * We need to duplicate filter_expression and filter,
1850 * because ownership is passed to first enable
1851 * event.
1852 */
1853 if (filter_expression) {
1854 filter_expression_a = strdup(filter_expression);
1855 if (!filter_expression_a) {
1856 ret = LTTNG_ERR_FATAL;
1857 goto error;
1858 }
1859 }
1860 if (filter) {
1861 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1862 if (!filter_a) {
1863 free(filter_expression_a);
1864 ret = LTTNG_ERR_FATAL;
1865 goto error;
1866 }
1867 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1868 }
1869 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
1870 ret = event_kernel_enable_event(kchan, event,
1871 filter_expression, filter);
1872 /* We have passed ownership */
1873 filter_expression = NULL;
1874 filter = NULL;
1875 if (ret != LTTNG_OK) {
1876 if (channel_created) {
1877 /* Let's not leak a useless channel. */
1878 kernel_destroy_channel(kchan);
1879 }
1880 free(filter_expression_a);
1881 free(filter_a);
1882 goto error;
1883 }
1884 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
1885 ret = event_kernel_enable_event(kchan, event,
1886 filter_expression_a, filter_a);
1887 /* We have passed ownership */
1888 filter_expression_a = NULL;
1889 filter_a = NULL;
1890 if (ret != LTTNG_OK) {
1891 goto error;
1892 }
1893 break;
1894 }
1895 case LTTNG_EVENT_PROBE:
1896 case LTTNG_EVENT_FUNCTION:
1897 case LTTNG_EVENT_FUNCTION_ENTRY:
1898 case LTTNG_EVENT_TRACEPOINT:
1899 ret = event_kernel_enable_event(kchan, event,
1900 filter_expression, filter);
1901 /* We have passed ownership */
1902 filter_expression = NULL;
1903 filter = NULL;
1904 if (ret != LTTNG_OK) {
1905 if (channel_created) {
1906 /* Let's not leak a useless channel. */
1907 kernel_destroy_channel(kchan);
1908 }
1909 goto error;
1910 }
1911 break;
1912 case LTTNG_EVENT_SYSCALL:
1913 ret = event_kernel_enable_event(kchan, event,
1914 filter_expression, filter);
1915 /* We have passed ownership */
1916 filter_expression = NULL;
1917 filter = NULL;
1918 if (ret != LTTNG_OK) {
1919 goto error;
1920 }
1921 break;
1922 default:
1923 ret = LTTNG_ERR_UNK;
1924 goto error;
1925 }
1926
1927 kernel_wait_quiescent(kernel_tracer_fd);
1928 break;
1929 }
1930 case LTTNG_DOMAIN_UST:
1931 {
1932 struct ltt_ust_channel *uchan;
1933 struct ltt_ust_session *usess = session->ust_session;
1934
1935 assert(usess);
1936
1937 /*
1938 * If a non-default channel has been created in the
1939 * session, explicitely require that -c chan_name needs
1940 * to be provided.
1941 */
1942 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1943 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1944 goto error;
1945 }
1946
1947 /* Get channel from global UST domain */
1948 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1949 channel_name);
1950 if (uchan == NULL) {
1951 /* Create default channel */
1952 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1953 usess->buffer_type);
1954 if (attr == NULL) {
1955 ret = LTTNG_ERR_FATAL;
1956 goto error;
1957 }
1958 if (lttng_strncpy(attr->name, channel_name,
1959 sizeof(attr->name))) {
1960 ret = LTTNG_ERR_INVALID;
1961 goto error;
1962 }
1963
1964 ret = cmd_enable_channel(session, domain, attr, wpipe);
1965 if (ret != LTTNG_OK) {
1966 goto error;
1967 }
1968
1969 /* Get the newly created channel reference back */
1970 uchan = trace_ust_find_channel_by_name(
1971 usess->domain_global.channels, channel_name);
1972 assert(uchan);
1973 }
1974
1975 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
1976 /*
1977 * Don't allow users to add UST events to channels which
1978 * are assigned to a userspace subdomain (JUL, Log4J,
1979 * Python, etc.).
1980 */
1981 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
1982 goto error;
1983 }
1984
1985 if (!internal_event) {
1986 /*
1987 * Ensure the event name is not reserved for internal
1988 * use.
1989 */
1990 ret = validate_ust_event_name(event->name);
1991 if (ret) {
1992 WARN("Userspace event name %s failed validation.",
1993 event->name ?
1994 event->name : "NULL");
1995 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1996 goto error;
1997 }
1998 }
1999
2000 /* At this point, the session and channel exist on the tracer */
2001 ret = event_ust_enable_tracepoint(usess, uchan, event,
2002 filter_expression, filter, exclusion,
2003 internal_event);
2004 /* We have passed ownership */
2005 filter_expression = NULL;
2006 filter = NULL;
2007 exclusion = NULL;
2008 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2009 goto already_enabled;
2010 } else if (ret != LTTNG_OK) {
2011 goto error;
2012 }
2013 break;
2014 }
2015 case LTTNG_DOMAIN_LOG4J:
2016 case LTTNG_DOMAIN_JUL:
2017 case LTTNG_DOMAIN_PYTHON:
2018 {
2019 const char *default_event_name, *default_chan_name;
2020 struct agent *agt;
2021 struct lttng_event uevent;
2022 struct lttng_domain tmp_dom;
2023 struct ltt_ust_session *usess = session->ust_session;
2024
2025 assert(usess);
2026
2027 agt = trace_ust_find_agent(usess, domain->type);
2028 if (!agt) {
2029 agt = agent_create(domain->type);
2030 if (!agt) {
2031 ret = LTTNG_ERR_NOMEM;
2032 goto error;
2033 }
2034 agent_add(agt, usess->agents);
2035 }
2036
2037 /* Create the default tracepoint. */
2038 memset(&uevent, 0, sizeof(uevent));
2039 uevent.type = LTTNG_EVENT_TRACEPOINT;
2040 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2041 default_event_name = event_get_default_agent_ust_name(
2042 domain->type);
2043 if (!default_event_name) {
2044 ret = LTTNG_ERR_FATAL;
2045 goto error;
2046 }
2047 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
2048 uevent.name[sizeof(uevent.name) - 1] = '\0';
2049
2050 /*
2051 * The domain type is changed because we are about to enable the
2052 * default channel and event for the JUL domain that are hardcoded.
2053 * This happens in the UST domain.
2054 */
2055 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2056 tmp_dom.type = LTTNG_DOMAIN_UST;
2057
2058 switch (domain->type) {
2059 case LTTNG_DOMAIN_LOG4J:
2060 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
2061 break;
2062 case LTTNG_DOMAIN_JUL:
2063 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
2064 break;
2065 case LTTNG_DOMAIN_PYTHON:
2066 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2067 break;
2068 default:
2069 /* The switch/case we are in makes this impossible */
2070 assert(0);
2071 }
2072
2073 {
2074 char *filter_expression_copy = NULL;
2075 struct lttng_filter_bytecode *filter_copy = NULL;
2076
2077 if (filter) {
2078 const size_t filter_size = sizeof(
2079 struct lttng_filter_bytecode)
2080 + filter->len;
2081
2082 filter_copy = zmalloc(filter_size);
2083 if (!filter_copy) {
2084 ret = LTTNG_ERR_NOMEM;
2085 goto error;
2086 }
2087 memcpy(filter_copy, filter, filter_size);
2088
2089 filter_expression_copy =
2090 strdup(filter_expression);
2091 if (!filter_expression) {
2092 ret = LTTNG_ERR_NOMEM;
2093 }
2094
2095 if (!filter_expression_copy || !filter_copy) {
2096 free(filter_expression_copy);
2097 free(filter_copy);
2098 goto error;
2099 }
2100 }
2101
2102 ret = cmd_enable_event_internal(session, &tmp_dom,
2103 (char *) default_chan_name,
2104 &uevent, filter_expression_copy,
2105 filter_copy, NULL, wpipe);
2106 }
2107
2108 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2109 goto already_enabled;
2110 } else if (ret != LTTNG_OK) {
2111 goto error;
2112 }
2113
2114 /* The wild card * means that everything should be enabled. */
2115 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
2116 ret = event_agent_enable_all(usess, agt, event, filter,
2117 filter_expression);
2118 } else {
2119 ret = event_agent_enable(usess, agt, event, filter,
2120 filter_expression);
2121 }
2122 filter = NULL;
2123 filter_expression = NULL;
2124 if (ret != LTTNG_OK) {
2125 goto error;
2126 }
2127
2128 break;
2129 }
2130 default:
2131 ret = LTTNG_ERR_UND;
2132 goto error;
2133 }
2134
2135 ret = LTTNG_OK;
2136
2137 already_enabled:
2138 error:
2139 free(filter_expression);
2140 free(filter);
2141 free(exclusion);
2142 free(attr);
2143 rcu_read_unlock();
2144 return ret;
2145 }
2146
2147 /*
2148 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2149 * We own filter, exclusion, and filter_expression.
2150 */
2151 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2152 char *channel_name, struct lttng_event *event,
2153 char *filter_expression,
2154 struct lttng_filter_bytecode *filter,
2155 struct lttng_event_exclusion *exclusion,
2156 int wpipe)
2157 {
2158 return _cmd_enable_event(session, domain, channel_name, event,
2159 filter_expression, filter, exclusion, wpipe, false);
2160 }
2161
2162 /*
2163 * Enable an event which is internal to LTTng. An internal should
2164 * never be made visible to clients and are immune to checks such as
2165 * reserved names.
2166 */
2167 static int cmd_enable_event_internal(struct ltt_session *session,
2168 struct lttng_domain *domain,
2169 char *channel_name, struct lttng_event *event,
2170 char *filter_expression,
2171 struct lttng_filter_bytecode *filter,
2172 struct lttng_event_exclusion *exclusion,
2173 int wpipe)
2174 {
2175 return _cmd_enable_event(session, domain, channel_name, event,
2176 filter_expression, filter, exclusion, wpipe, true);
2177 }
2178
2179 /*
2180 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2181 */
2182 ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2183 struct lttng_event **events)
2184 {
2185 int ret;
2186 ssize_t nb_events = 0;
2187
2188 switch (domain) {
2189 case LTTNG_DOMAIN_KERNEL:
2190 nb_events = kernel_list_events(kernel_tracer_fd, events);
2191 if (nb_events < 0) {
2192 ret = LTTNG_ERR_KERN_LIST_FAIL;
2193 goto error;
2194 }
2195 break;
2196 case LTTNG_DOMAIN_UST:
2197 nb_events = ust_app_list_events(events);
2198 if (nb_events < 0) {
2199 ret = LTTNG_ERR_UST_LIST_FAIL;
2200 goto error;
2201 }
2202 break;
2203 case LTTNG_DOMAIN_LOG4J:
2204 case LTTNG_DOMAIN_JUL:
2205 case LTTNG_DOMAIN_PYTHON:
2206 nb_events = agent_list_events(events, domain);
2207 if (nb_events < 0) {
2208 ret = LTTNG_ERR_UST_LIST_FAIL;
2209 goto error;
2210 }
2211 break;
2212 default:
2213 ret = LTTNG_ERR_UND;
2214 goto error;
2215 }
2216
2217 return nb_events;
2218
2219 error:
2220 /* Return negative value to differentiate return code */
2221 return -ret;
2222 }
2223
2224 /*
2225 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2226 */
2227 ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2228 struct lttng_event_field **fields)
2229 {
2230 int ret;
2231 ssize_t nb_fields = 0;
2232
2233 switch (domain) {
2234 case LTTNG_DOMAIN_UST:
2235 nb_fields = ust_app_list_event_fields(fields);
2236 if (nb_fields < 0) {
2237 ret = LTTNG_ERR_UST_LIST_FAIL;
2238 goto error;
2239 }
2240 break;
2241 case LTTNG_DOMAIN_KERNEL:
2242 default: /* fall-through */
2243 ret = LTTNG_ERR_UND;
2244 goto error;
2245 }
2246
2247 return nb_fields;
2248
2249 error:
2250 /* Return negative value to differentiate return code */
2251 return -ret;
2252 }
2253
2254 ssize_t cmd_list_syscalls(struct lttng_event **events)
2255 {
2256 return syscall_table_list(events);
2257 }
2258
2259 /*
2260 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2261 *
2262 * Called with session lock held.
2263 */
2264 ssize_t cmd_list_tracker_pids(struct ltt_session *session,
2265 enum lttng_domain_type domain, int32_t **pids)
2266 {
2267 int ret;
2268 ssize_t nr_pids = 0;
2269
2270 switch (domain) {
2271 case LTTNG_DOMAIN_KERNEL:
2272 {
2273 struct ltt_kernel_session *ksess;
2274
2275 ksess = session->kernel_session;
2276 nr_pids = kernel_list_tracker_pids(ksess, pids);
2277 if (nr_pids < 0) {
2278 ret = LTTNG_ERR_KERN_LIST_FAIL;
2279 goto error;
2280 }
2281 break;
2282 }
2283 case LTTNG_DOMAIN_UST:
2284 {
2285 struct ltt_ust_session *usess;
2286
2287 usess = session->ust_session;
2288 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2289 if (nr_pids < 0) {
2290 ret = LTTNG_ERR_UST_LIST_FAIL;
2291 goto error;
2292 }
2293 break;
2294 }
2295 case LTTNG_DOMAIN_LOG4J:
2296 case LTTNG_DOMAIN_JUL:
2297 case LTTNG_DOMAIN_PYTHON:
2298 default:
2299 ret = LTTNG_ERR_UND;
2300 goto error;
2301 }
2302
2303 return nr_pids;
2304
2305 error:
2306 /* Return negative value to differentiate return code */
2307 return -ret;
2308 }
2309
2310 /*
2311 * Command LTTNG_START_TRACE processed by the client thread.
2312 *
2313 * Called with session mutex held.
2314 */
2315 int cmd_start_trace(struct ltt_session *session)
2316 {
2317 int ret;
2318 unsigned long nb_chan = 0;
2319 struct ltt_kernel_session *ksession;
2320 struct ltt_ust_session *usess;
2321
2322 assert(session);
2323
2324 /* Ease our life a bit ;) */
2325 ksession = session->kernel_session;
2326 usess = session->ust_session;
2327
2328 /* Is the session already started? */
2329 if (session->active) {
2330 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2331 goto error;
2332 }
2333
2334 /*
2335 * Starting a session without channel is useless since after that it's not
2336 * possible to enable channel thus inform the client.
2337 */
2338 if (usess && usess->domain_global.channels) {
2339 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2340 }
2341 if (ksession) {
2342 nb_chan += ksession->channel_count;
2343 }
2344 if (!nb_chan) {
2345 ret = LTTNG_ERR_NO_CHANNEL;
2346 goto error;
2347 }
2348
2349 /* Kernel tracing */
2350 if (ksession != NULL) {
2351 ret = start_kernel_session(ksession, kernel_tracer_fd);
2352 if (ret != LTTNG_OK) {
2353 goto error;
2354 }
2355 }
2356
2357 /* Flag session that trace should start automatically */
2358 if (usess) {
2359 /*
2360 * Even though the start trace might fail, flag this session active so
2361 * other application coming in are started by default.
2362 */
2363 usess->active = 1;
2364
2365 ret = ust_app_start_trace_all(usess);
2366 if (ret < 0) {
2367 ret = LTTNG_ERR_UST_START_FAIL;
2368 goto error;
2369 }
2370 }
2371
2372 /* Flag this after a successful start. */
2373 session->has_been_started = 1;
2374 session->active = 1;
2375
2376 ret = LTTNG_OK;
2377
2378 error:
2379 return ret;
2380 }
2381
2382 /*
2383 * Command LTTNG_STOP_TRACE processed by the client thread.
2384 */
2385 int cmd_stop_trace(struct ltt_session *session)
2386 {
2387 int ret;
2388 struct ltt_kernel_channel *kchan;
2389 struct ltt_kernel_session *ksession;
2390 struct ltt_ust_session *usess;
2391
2392 assert(session);
2393
2394 /* Short cut */
2395 ksession = session->kernel_session;
2396 usess = session->ust_session;
2397
2398 /* Session is not active. Skip everythong and inform the client. */
2399 if (!session->active) {
2400 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2401 goto error;
2402 }
2403
2404 /* Kernel tracer */
2405 if (ksession && ksession->active) {
2406 DBG("Stop kernel tracing");
2407
2408 ret = kernel_stop_session(ksession);
2409 if (ret < 0) {
2410 ret = LTTNG_ERR_KERN_STOP_FAIL;
2411 goto error;
2412 }
2413
2414 kernel_wait_quiescent(kernel_tracer_fd);
2415
2416 /* Flush metadata after stopping (if exists) */
2417 if (ksession->metadata_stream_fd >= 0) {
2418 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2419 if (ret < 0) {
2420 ERR("Kernel metadata flush failed");
2421 }
2422 }
2423
2424 /* Flush all buffers after stopping */
2425 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2426 ret = kernel_flush_buffer(kchan);
2427 if (ret < 0) {
2428 ERR("Kernel flush buffer error");
2429 }
2430 }
2431
2432 ksession->active = 0;
2433 }
2434
2435 if (usess && usess->active) {
2436 /*
2437 * Even though the stop trace might fail, flag this session inactive so
2438 * other application coming in are not started by default.
2439 */
2440 usess->active = 0;
2441
2442 ret = ust_app_stop_trace_all(usess);
2443 if (ret < 0) {
2444 ret = LTTNG_ERR_UST_STOP_FAIL;
2445 goto error;
2446 }
2447 }
2448
2449 /* Flag inactive after a successful stop. */
2450 session->active = 0;
2451 ret = LTTNG_OK;
2452
2453 error:
2454 return ret;
2455 }
2456
2457 /*
2458 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2459 */
2460 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2461 struct lttng_uri *uris)
2462 {
2463 int ret, i;
2464 struct ltt_kernel_session *ksess = session->kernel_session;
2465 struct ltt_ust_session *usess = session->ust_session;
2466
2467 assert(session);
2468 assert(uris);
2469 assert(nb_uri > 0);
2470
2471 /* Can't set consumer URI if the session is active. */
2472 if (session->active) {
2473 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2474 goto error;
2475 }
2476
2477 /* Set the "global" consumer URIs */
2478 for (i = 0; i < nb_uri; i++) {
2479 ret = add_uri_to_consumer(session->consumer,
2480 &uris[i], 0, session->name);
2481 if (ret != LTTNG_OK) {
2482 goto error;
2483 }
2484 }
2485
2486 /* Set UST session URIs */
2487 if (session->ust_session) {
2488 for (i = 0; i < nb_uri; i++) {
2489 ret = add_uri_to_consumer(
2490 session->ust_session->consumer,
2491 &uris[i], LTTNG_DOMAIN_UST,
2492 session->name);
2493 if (ret != LTTNG_OK) {
2494 goto error;
2495 }
2496 }
2497 }
2498
2499 /* Set kernel session URIs */
2500 if (session->kernel_session) {
2501 for (i = 0; i < nb_uri; i++) {
2502 ret = add_uri_to_consumer(
2503 session->kernel_session->consumer,
2504 &uris[i], LTTNG_DOMAIN_KERNEL,
2505 session->name);
2506 if (ret != LTTNG_OK) {
2507 goto error;
2508 }
2509 }
2510 }
2511
2512 /*
2513 * Make sure to set the session in output mode after we set URI since a
2514 * session can be created without URL (thus flagged in no output mode).
2515 */
2516 session->output_traces = 1;
2517 if (ksess) {
2518 ksess->output_traces = 1;
2519 }
2520
2521 if (usess) {
2522 usess->output_traces = 1;
2523 }
2524
2525 /* All good! */
2526 ret = LTTNG_OK;
2527
2528 error:
2529 return ret;
2530 }
2531
2532 /*
2533 * Command LTTNG_CREATE_SESSION processed by the client thread.
2534 */
2535 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2536 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2537 {
2538 int ret;
2539 struct ltt_session *session;
2540
2541 assert(name);
2542 assert(creds);
2543
2544 /*
2545 * Verify if the session already exist
2546 *
2547 * XXX: There is no need for the session lock list here since the caller
2548 * (process_client_msg) is holding it. We might want to change that so a
2549 * single command does not lock the entire session list.
2550 */
2551 session = session_find_by_name(name);
2552 if (session != NULL) {
2553 ret = LTTNG_ERR_EXIST_SESS;
2554 goto find_error;
2555 }
2556
2557 /* Create tracing session in the registry */
2558 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2559 LTTNG_SOCK_GET_GID_CRED(creds));
2560 if (ret != LTTNG_OK) {
2561 goto session_error;
2562 }
2563
2564 /*
2565 * Get the newly created session pointer back
2566 *
2567 * XXX: There is no need for the session lock list here since the caller
2568 * (process_client_msg) is holding it. We might want to change that so a
2569 * single command does not lock the entire session list.
2570 */
2571 session = session_find_by_name(name);
2572 assert(session);
2573
2574 session->live_timer = live_timer;
2575 /* Create default consumer output for the session not yet created. */
2576 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2577 if (session->consumer == NULL) {
2578 ret = LTTNG_ERR_FATAL;
2579 goto consumer_error;
2580 }
2581
2582 if (uris) {
2583 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2584 if (ret != LTTNG_OK) {
2585 goto consumer_error;
2586 }
2587 session->output_traces = 1;
2588 } else {
2589 session->output_traces = 0;
2590 DBG2("Session %s created with no output", session->name);
2591 }
2592
2593 session->consumer->enabled = 1;
2594
2595 return LTTNG_OK;
2596
2597 consumer_error:
2598 session_destroy(session);
2599 session_error:
2600 find_error:
2601 return ret;
2602 }
2603
2604 /*
2605 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2606 */
2607 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2608 size_t nb_uri, lttng_sock_cred *creds)
2609 {
2610 int ret;
2611 struct ltt_session *session;
2612 struct snapshot_output *new_output = NULL;
2613
2614 assert(name);
2615 assert(creds);
2616
2617 /*
2618 * Create session in no output mode with URIs set to NULL. The uris we've
2619 * received are for a default snapshot output if one.
2620 */
2621 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
2622 if (ret != LTTNG_OK) {
2623 goto error;
2624 }
2625
2626 /* Get the newly created session pointer back. This should NEVER fail. */
2627 session = session_find_by_name(name);
2628 assert(session);
2629
2630 /* Flag session for snapshot mode. */
2631 session->snapshot_mode = 1;
2632
2633 /* Skip snapshot output creation if no URI is given. */
2634 if (nb_uri == 0) {
2635 goto end;
2636 }
2637
2638 new_output = snapshot_output_alloc();
2639 if (!new_output) {
2640 ret = LTTNG_ERR_NOMEM;
2641 goto error_snapshot_alloc;
2642 }
2643
2644 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2645 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2646 if (ret < 0) {
2647 if (ret == -ENOMEM) {
2648 ret = LTTNG_ERR_NOMEM;
2649 } else {
2650 ret = LTTNG_ERR_INVALID;
2651 }
2652 goto error_snapshot;
2653 }
2654
2655 rcu_read_lock();
2656 snapshot_add_output(&session->snapshot, new_output);
2657 rcu_read_unlock();
2658
2659 end:
2660 return LTTNG_OK;
2661
2662 error_snapshot:
2663 snapshot_output_destroy(new_output);
2664 error_snapshot_alloc:
2665 session_destroy(session);
2666 error:
2667 return ret;
2668 }
2669
2670 /*
2671 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2672 *
2673 * Called with session lock held.
2674 */
2675 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2676 {
2677 int ret;
2678 struct ltt_ust_session *usess;
2679 struct ltt_kernel_session *ksess;
2680
2681 /* Safety net */
2682 assert(session);
2683
2684 usess = session->ust_session;
2685 ksess = session->kernel_session;
2686
2687 /* Clean kernel session teardown */
2688 kernel_destroy_session(ksess);
2689
2690 /* UST session teardown */
2691 if (usess) {
2692 /* Close any relayd session */
2693 consumer_output_send_destroy_relayd(usess->consumer);
2694
2695 /* Destroy every UST application related to this session. */
2696 ret = ust_app_destroy_trace_all(usess);
2697 if (ret) {
2698 ERR("Error in ust_app_destroy_trace_all");
2699 }
2700
2701 /* Clean up the rest. */
2702 trace_ust_destroy_session(usess);
2703 }
2704
2705 /*
2706 * Must notify the kernel thread here to update it's poll set in order to
2707 * remove the channel(s)' fd just destroyed.
2708 */
2709 ret = notify_thread_pipe(wpipe);
2710 if (ret < 0) {
2711 PERROR("write kernel poll pipe");
2712 }
2713
2714 ret = session_destroy(session);
2715
2716 return ret;
2717 }
2718
2719 /*
2720 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2721 */
2722 int cmd_register_consumer(struct ltt_session *session,
2723 enum lttng_domain_type domain, const char *sock_path,
2724 struct consumer_data *cdata)
2725 {
2726 int ret, sock;
2727 struct consumer_socket *socket = NULL;
2728
2729 assert(session);
2730 assert(cdata);
2731 assert(sock_path);
2732
2733 switch (domain) {
2734 case LTTNG_DOMAIN_KERNEL:
2735 {
2736 struct ltt_kernel_session *ksess = session->kernel_session;
2737
2738 assert(ksess);
2739
2740 /* Can't register a consumer if there is already one */
2741 if (ksess->consumer_fds_sent != 0) {
2742 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2743 goto error;
2744 }
2745
2746 sock = lttcomm_connect_unix_sock(sock_path);
2747 if (sock < 0) {
2748 ret = LTTNG_ERR_CONNECT_FAIL;
2749 goto error;
2750 }
2751 cdata->cmd_sock = sock;
2752
2753 socket = consumer_allocate_socket(&cdata->cmd_sock);
2754 if (socket == NULL) {
2755 ret = close(sock);
2756 if (ret < 0) {
2757 PERROR("close register consumer");
2758 }
2759 cdata->cmd_sock = -1;
2760 ret = LTTNG_ERR_FATAL;
2761 goto error;
2762 }
2763
2764 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2765 if (socket->lock == NULL) {
2766 PERROR("zmalloc pthread mutex");
2767 ret = LTTNG_ERR_FATAL;
2768 goto error;
2769 }
2770 pthread_mutex_init(socket->lock, NULL);
2771 socket->registered = 1;
2772
2773 rcu_read_lock();
2774 consumer_add_socket(socket, ksess->consumer);
2775 rcu_read_unlock();
2776
2777 pthread_mutex_lock(&cdata->pid_mutex);
2778 cdata->pid = -1;
2779 pthread_mutex_unlock(&cdata->pid_mutex);
2780
2781 break;
2782 }
2783 default:
2784 /* TODO: Userspace tracing */
2785 ret = LTTNG_ERR_UND;
2786 goto error;
2787 }
2788
2789 return LTTNG_OK;
2790
2791 error:
2792 if (socket) {
2793 consumer_destroy_socket(socket);
2794 }
2795 return ret;
2796 }
2797
2798 /*
2799 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2800 */
2801 ssize_t cmd_list_domains(struct ltt_session *session,
2802 struct lttng_domain **domains)
2803 {
2804 int ret, index = 0;
2805 ssize_t nb_dom = 0;
2806 struct agent *agt;
2807 struct lttng_ht_iter iter;
2808
2809 if (session->kernel_session != NULL) {
2810 DBG3("Listing domains found kernel domain");
2811 nb_dom++;
2812 }
2813
2814 if (session->ust_session != NULL) {
2815 DBG3("Listing domains found UST global domain");
2816 nb_dom++;
2817
2818 rcu_read_lock();
2819 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2820 agt, node.node) {
2821 if (agt->being_used) {
2822 nb_dom++;
2823 }
2824 }
2825 rcu_read_unlock();
2826 }
2827
2828 if (!nb_dom) {
2829 goto end;
2830 }
2831
2832 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2833 if (*domains == NULL) {
2834 ret = LTTNG_ERR_FATAL;
2835 goto error;
2836 }
2837
2838 if (session->kernel_session != NULL) {
2839 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2840
2841 /* Kernel session buffer type is always GLOBAL */
2842 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2843
2844 index++;
2845 }
2846
2847 if (session->ust_session != NULL) {
2848 (*domains)[index].type = LTTNG_DOMAIN_UST;
2849 (*domains)[index].buf_type = session->ust_session->buffer_type;
2850 index++;
2851
2852 rcu_read_lock();
2853 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2854 agt, node.node) {
2855 if (agt->being_used) {
2856 (*domains)[index].type = agt->domain;
2857 (*domains)[index].buf_type = session->ust_session->buffer_type;
2858 index++;
2859 }
2860 }
2861 rcu_read_unlock();
2862 }
2863 end:
2864 return nb_dom;
2865
2866 error:
2867 /* Return negative value to differentiate return code */
2868 return -ret;
2869 }
2870
2871
2872 /*
2873 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2874 */
2875 ssize_t cmd_list_channels(enum lttng_domain_type domain,
2876 struct ltt_session *session, struct lttng_channel **channels)
2877 {
2878 ssize_t nb_chan = 0, payload_size = 0, ret;
2879
2880 switch (domain) {
2881 case LTTNG_DOMAIN_KERNEL:
2882 if (session->kernel_session != NULL) {
2883 nb_chan = session->kernel_session->channel_count;
2884 }
2885 DBG3("Number of kernel channels %zd", nb_chan);
2886 if (nb_chan <= 0) {
2887 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2888 goto end;
2889 }
2890 break;
2891 case LTTNG_DOMAIN_UST:
2892 if (session->ust_session != NULL) {
2893 rcu_read_lock();
2894 nb_chan = lttng_ht_get_count(
2895 session->ust_session->domain_global.channels);
2896 rcu_read_unlock();
2897 }
2898 DBG3("Number of UST global channels %zd", nb_chan);
2899 if (nb_chan < 0) {
2900 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
2901 goto end;
2902 }
2903 break;
2904 default:
2905 ret = -LTTNG_ERR_UND;
2906 goto end;
2907 }
2908
2909 if (nb_chan > 0) {
2910 const size_t channel_size = sizeof(struct lttng_channel) +
2911 sizeof(struct lttcomm_channel_extended);
2912 struct lttcomm_channel_extended *channel_exts;
2913
2914 payload_size = nb_chan * channel_size;
2915 *channels = zmalloc(payload_size);
2916 if (*channels == NULL) {
2917 ret = -LTTNG_ERR_FATAL;
2918 goto end;
2919 }
2920
2921 channel_exts = ((void *) *channels) +
2922 (nb_chan * sizeof(struct lttng_channel));
2923 list_lttng_channels(domain, session, *channels, channel_exts);
2924 } else {
2925 *channels = NULL;
2926 }
2927
2928 ret = payload_size;
2929 end:
2930 return ret;
2931 }
2932
2933 /*
2934 * Command LTTNG_LIST_EVENTS processed by the client thread.
2935 */
2936 ssize_t cmd_list_events(enum lttng_domain_type domain,
2937 struct ltt_session *session, char *channel_name,
2938 struct lttng_event **events, size_t *total_size)
2939 {
2940 int ret = 0;
2941 ssize_t nb_event = 0;
2942
2943 switch (domain) {
2944 case LTTNG_DOMAIN_KERNEL:
2945 if (session->kernel_session != NULL) {
2946 nb_event = list_lttng_kernel_events(channel_name,
2947 session->kernel_session, events,
2948 total_size);
2949 }
2950 break;
2951 case LTTNG_DOMAIN_UST:
2952 {
2953 if (session->ust_session != NULL) {
2954 nb_event = list_lttng_ust_global_events(channel_name,
2955 &session->ust_session->domain_global, events,
2956 total_size);
2957 }
2958 break;
2959 }
2960 case LTTNG_DOMAIN_LOG4J:
2961 case LTTNG_DOMAIN_JUL:
2962 case LTTNG_DOMAIN_PYTHON:
2963 if (session->ust_session) {
2964 struct lttng_ht_iter iter;
2965 struct agent *agt;
2966
2967 rcu_read_lock();
2968 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2969 &iter.iter, agt, node.node) {
2970 if (agt->domain == domain) {
2971 nb_event = list_lttng_agent_events(
2972 agt, events,
2973 total_size);
2974 break;
2975 }
2976 }
2977 rcu_read_unlock();
2978 }
2979 break;
2980 default:
2981 ret = LTTNG_ERR_UND;
2982 goto error;
2983 }
2984
2985 return nb_event;
2986
2987 error:
2988 /* Return negative value to differentiate return code */
2989 return -ret;
2990 }
2991
2992 /*
2993 * Using the session list, filled a lttng_session array to send back to the
2994 * client for session listing.
2995 *
2996 * The session list lock MUST be acquired before calling this function. Use
2997 * session_lock_list() and session_unlock_list().
2998 */
2999 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3000 gid_t gid)
3001 {
3002 int ret;
3003 unsigned int i = 0;
3004 struct ltt_session *session;
3005 struct ltt_session_list *list = session_get_list();
3006
3007 DBG("Getting all available session for UID %d GID %d",
3008 uid, gid);
3009 /*
3010 * Iterate over session list and append data after the control struct in
3011 * the buffer.
3012 */
3013 cds_list_for_each_entry(session, &list->head, list) {
3014 /*
3015 * Only list the sessions the user can control.
3016 */
3017 if (!session_access_ok(session, uid, gid)) {
3018 continue;
3019 }
3020
3021 struct ltt_kernel_session *ksess = session->kernel_session;
3022 struct ltt_ust_session *usess = session->ust_session;
3023
3024 if (session->consumer->type == CONSUMER_DST_NET ||
3025 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3026 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3027 ret = build_network_session_path(sessions[i].path,
3028 sizeof(sessions[i].path), session);
3029 } else {
3030 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
3031 session->consumer->dst.trace_path);
3032 }
3033 if (ret < 0) {
3034 PERROR("snprintf session path");
3035 continue;
3036 }
3037
3038 strncpy(sessions[i].name, session->name, NAME_MAX);
3039 sessions[i].name[NAME_MAX - 1] = '\0';
3040 sessions[i].enabled = session->active;
3041 sessions[i].snapshot_mode = session->snapshot_mode;
3042 sessions[i].live_timer_interval = session->live_timer;
3043 i++;
3044 }
3045 }
3046
3047 /*
3048 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3049 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3050 */
3051 int cmd_data_pending(struct ltt_session *session)
3052 {
3053 int ret;
3054 struct ltt_kernel_session *ksess = session->kernel_session;
3055 struct ltt_ust_session *usess = session->ust_session;
3056
3057 assert(session);
3058
3059 /* Session MUST be stopped to ask for data availability. */
3060 if (session->active) {
3061 ret = LTTNG_ERR_SESSION_STARTED;
3062 goto error;
3063 } else {
3064 /*
3065 * If stopped, just make sure we've started before else the above call
3066 * will always send that there is data pending.
3067 *
3068 * The consumer assumes that when the data pending command is received,
3069 * the trace has been started before or else no output data is written
3070 * by the streams which is a condition for data pending. So, this is
3071 * *VERY* important that we don't ask the consumer before a start
3072 * trace.
3073 */
3074 if (!session->has_been_started) {
3075 ret = 0;
3076 goto error;
3077 }
3078 }
3079
3080 if (ksess && ksess->consumer) {
3081 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3082 if (ret == 1) {
3083 /* Data is still being extracted for the kernel. */
3084 goto error;
3085 }
3086 }
3087
3088 if (usess && usess->consumer) {
3089 ret = consumer_is_data_pending(usess->id, usess->consumer);
3090 if (ret == 1) {
3091 /* Data is still being extracted for the kernel. */
3092 goto error;
3093 }
3094 }
3095
3096 /* Data is ready to be read by a viewer */
3097 ret = 0;
3098
3099 error:
3100 return ret;
3101 }
3102
3103 /*
3104 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3105 *
3106 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3107 */
3108 int cmd_snapshot_add_output(struct ltt_session *session,
3109 struct lttng_snapshot_output *output, uint32_t *id)
3110 {
3111 int ret;
3112 struct snapshot_output *new_output;
3113
3114 assert(session);
3115 assert(output);
3116
3117 DBG("Cmd snapshot add output for session %s", session->name);
3118
3119 /*
3120 * Can't create an output if the session is not set in no-output mode.
3121 */
3122 if (session->output_traces) {
3123 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3124 goto error;
3125 }
3126
3127 /* Only one output is allowed until we have the "tee" feature. */
3128 if (session->snapshot.nb_output == 1) {
3129 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3130 goto error;
3131 }
3132
3133 new_output = snapshot_output_alloc();
3134 if (!new_output) {
3135 ret = LTTNG_ERR_NOMEM;
3136 goto error;
3137 }
3138
3139 ret = snapshot_output_init(output->max_size, output->name,
3140 output->ctrl_url, output->data_url, session->consumer, new_output,
3141 &session->snapshot);
3142 if (ret < 0) {
3143 if (ret == -ENOMEM) {
3144 ret = LTTNG_ERR_NOMEM;
3145 } else {
3146 ret = LTTNG_ERR_INVALID;
3147 }
3148 goto free_error;
3149 }
3150
3151 rcu_read_lock();
3152 snapshot_add_output(&session->snapshot, new_output);
3153 if (id) {
3154 *id = new_output->id;
3155 }
3156 rcu_read_unlock();
3157
3158 return LTTNG_OK;
3159
3160 free_error:
3161 snapshot_output_destroy(new_output);
3162 error:
3163 return ret;
3164 }
3165
3166 /*
3167 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3168 *
3169 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3170 */
3171 int cmd_snapshot_del_output(struct ltt_session *session,
3172 struct lttng_snapshot_output *output)
3173 {
3174 int ret;
3175 struct snapshot_output *sout = NULL;
3176
3177 assert(session);
3178 assert(output);
3179
3180 rcu_read_lock();
3181
3182 /*
3183 * Permission denied to create an output if the session is not
3184 * set in no output mode.
3185 */
3186 if (session->output_traces) {
3187 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3188 goto error;
3189 }
3190
3191 if (output->id) {
3192 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3193 session->name);
3194 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3195 } else if (*output->name != '\0') {
3196 DBG("Cmd snapshot del output name %s for session %s", output->name,
3197 session->name);
3198 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3199 }
3200 if (!sout) {
3201 ret = LTTNG_ERR_INVALID;
3202 goto error;
3203 }
3204
3205 snapshot_delete_output(&session->snapshot, sout);
3206 snapshot_output_destroy(sout);
3207 ret = LTTNG_OK;
3208
3209 error:
3210 rcu_read_unlock();
3211 return ret;
3212 }
3213
3214 /*
3215 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3216 *
3217 * If no output is available, outputs is untouched and 0 is returned.
3218 *
3219 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3220 */
3221 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3222 struct lttng_snapshot_output **outputs)
3223 {
3224 int ret, idx = 0;
3225 struct lttng_snapshot_output *list = NULL;
3226 struct lttng_ht_iter iter;
3227 struct snapshot_output *output;
3228
3229 assert(session);
3230 assert(outputs);
3231
3232 DBG("Cmd snapshot list outputs for session %s", session->name);
3233
3234 /*
3235 * Permission denied to create an output if the session is not
3236 * set in no output mode.
3237 */
3238 if (session->output_traces) {
3239 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3240 goto end;
3241 }
3242
3243 if (session->snapshot.nb_output == 0) {
3244 ret = 0;
3245 goto end;
3246 }
3247
3248 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3249 if (!list) {
3250 ret = -LTTNG_ERR_NOMEM;
3251 goto end;
3252 }
3253
3254 /* Copy list from session to the new list object. */
3255 rcu_read_lock();
3256 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3257 output, node.node) {
3258 assert(output->consumer);
3259 list[idx].id = output->id;
3260 list[idx].max_size = output->max_size;
3261 if (lttng_strncpy(list[idx].name, output->name,
3262 sizeof(list[idx].name))) {
3263 ret = -LTTNG_ERR_INVALID;
3264 goto error;
3265 }
3266 if (output->consumer->type == CONSUMER_DST_LOCAL) {
3267 if (lttng_strncpy(list[idx].ctrl_url,
3268 output->consumer->dst.trace_path,
3269 sizeof(list[idx].ctrl_url))) {
3270 ret = -LTTNG_ERR_INVALID;
3271 goto error;
3272 }
3273 } else {
3274 /* Control URI. */
3275 ret = uri_to_str_url(&output->consumer->dst.net.control,
3276 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3277 if (ret < 0) {
3278 ret = -LTTNG_ERR_NOMEM;
3279 goto error;
3280 }
3281
3282 /* Data URI. */
3283 ret = uri_to_str_url(&output->consumer->dst.net.data,
3284 list[idx].data_url, sizeof(list[idx].data_url));
3285 if (ret < 0) {
3286 ret = -LTTNG_ERR_NOMEM;
3287 goto error;
3288 }
3289 }
3290 idx++;
3291 }
3292
3293 *outputs = list;
3294 list = NULL;
3295 ret = session->snapshot.nb_output;
3296 error:
3297 rcu_read_unlock();
3298 free(list);
3299 end:
3300 return ret;
3301 }
3302
3303 /*
3304 * Check if we can regenerate the metadata for this session.
3305 * Only kernel, UST per-uid and non-live sessions are supported.
3306 *
3307 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3308 */
3309 static
3310 int check_regenerate_metadata_support(struct ltt_session *session)
3311 {
3312 int ret;
3313
3314 assert(session);
3315
3316 if (session->live_timer != 0) {
3317 ret = LTTNG_ERR_LIVE_SESSION;
3318 goto end;
3319 }
3320 if (!session->active) {
3321 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3322 goto end;
3323 }
3324 if (session->ust_session) {
3325 switch (session->ust_session->buffer_type) {
3326 case LTTNG_BUFFER_PER_UID:
3327 break;
3328 case LTTNG_BUFFER_PER_PID:
3329 ret = LTTNG_ERR_PER_PID_SESSION;
3330 goto end;
3331 default:
3332 assert(0);
3333 ret = LTTNG_ERR_UNK;
3334 goto end;
3335 }
3336 }
3337 if (session->consumer->type == CONSUMER_DST_NET &&
3338 session->consumer->relay_minor_version < 8) {
3339 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
3340 goto end;
3341 }
3342 ret = 0;
3343
3344 end:
3345 return ret;
3346 }
3347
3348 static
3349 int clear_metadata_file(int fd)
3350 {
3351 int ret;
3352
3353 ret = lseek(fd, 0, SEEK_SET);
3354 if (ret < 0) {
3355 PERROR("lseek");
3356 goto end;
3357 }
3358
3359 ret = ftruncate(fd, 0);
3360 if (ret < 0) {
3361 PERROR("ftruncate");
3362 goto end;
3363 }
3364
3365 end:
3366 return ret;
3367 }
3368
3369 static
3370 int ust_regenerate_metadata(struct ltt_ust_session *usess)
3371 {
3372 int ret = 0;
3373 struct buffer_reg_uid *uid_reg = NULL;
3374 struct buffer_reg_session *session_reg = NULL;
3375
3376 rcu_read_lock();
3377 cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) {
3378 struct ust_registry_session *registry;
3379 struct ust_registry_channel *chan;
3380 struct lttng_ht_iter iter_chan;
3381
3382 session_reg = uid_reg->registry;
3383 registry = session_reg->reg.ust;
3384
3385 pthread_mutex_lock(&registry->lock);
3386 registry->metadata_len_sent = 0;
3387 memset(registry->metadata, 0, registry->metadata_alloc_len);
3388 registry->metadata_len = 0;
3389 registry->metadata_version++;
3390 if (registry->metadata_fd > 0) {
3391 /* Clear the metadata file's content. */
3392 ret = clear_metadata_file(registry->metadata_fd);
3393 if (ret) {
3394 pthread_mutex_unlock(&registry->lock);
3395 goto end;
3396 }
3397 }
3398
3399 ret = ust_metadata_session_statedump(registry, NULL,
3400 registry->major, registry->minor);
3401 if (ret) {
3402 pthread_mutex_unlock(&registry->lock);
3403 ERR("Failed to generate session metadata (err = %d)",
3404 ret);
3405 goto end;
3406 }
3407 cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter,
3408 chan, node.node) {
3409 struct ust_registry_event *event;
3410 struct lttng_ht_iter iter_event;
3411
3412 ret = ust_metadata_channel_statedump(registry, chan);
3413 if (ret) {
3414 pthread_mutex_unlock(&registry->lock);
3415 ERR("Failed to generate channel metadata "
3416 "(err = %d)", ret);
3417 goto end;
3418 }
3419 cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter,
3420 event, node.node) {
3421 ret = ust_metadata_event_statedump(registry,
3422 chan, event);
3423 if (ret) {
3424 pthread_mutex_unlock(&registry->lock);
3425 ERR("Failed to generate event metadata "
3426 "(err = %d)", ret);
3427 goto end;
3428 }
3429 }
3430 }
3431 pthread_mutex_unlock(&registry->lock);
3432 }
3433
3434 end:
3435 rcu_read_unlock();
3436 return ret;
3437 }
3438
3439 /*
3440 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
3441 *
3442 * Ask the consumer to truncate the existing metadata file(s) and
3443 * then regenerate the metadata. Live and per-pid sessions are not
3444 * supported and return an error.
3445 *
3446 * Return 0 on success or else a LTTNG_ERR code.
3447 */
3448 int cmd_regenerate_metadata(struct ltt_session *session)
3449 {
3450 int ret;
3451
3452 assert(session);
3453
3454 ret = check_regenerate_metadata_support(session);
3455 if (ret) {
3456 goto end;
3457 }
3458
3459 if (session->kernel_session) {
3460 ret = kernctl_session_regenerate_metadata(
3461 session->kernel_session->fd);
3462 if (ret < 0) {
3463 ERR("Failed to regenerate the kernel metadata");
3464 goto end;
3465 }
3466 }
3467
3468 if (session->ust_session) {
3469 ret = ust_regenerate_metadata(session->ust_session);
3470 if (ret < 0) {
3471 ERR("Failed to regenerate the UST metadata");
3472 goto end;
3473 }
3474 }
3475 DBG("Cmd metadata regenerate for session %s", session->name);
3476 ret = LTTNG_OK;
3477
3478 end:
3479 return ret;
3480 }
3481
3482 /*
3483 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
3484 *
3485 * Ask the tracer to regenerate a new statedump.
3486 *
3487 * Return 0 on success or else a LTTNG_ERR code.
3488 */
3489 int cmd_regenerate_statedump(struct ltt_session *session)
3490 {
3491 int ret;
3492
3493 assert(session);
3494
3495 if (!session->active) {
3496 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3497 goto end;
3498 }
3499 ret = 0;
3500
3501 if (session->kernel_session) {
3502 ret = kernctl_session_regenerate_statedump(
3503 session->kernel_session->fd);
3504 /*
3505 * Currently, the statedump in kernel can only fail if out
3506 * of memory.
3507 */
3508 if (ret < 0) {
3509 if (ret == -ENOMEM) {
3510 ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM;
3511 } else {
3512 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
3513 }
3514 ERR("Failed to regenerate the kernel statedump");
3515 goto end;
3516 }
3517 }
3518
3519 if (session->ust_session) {
3520 ret = ust_app_regenerate_statedump_all(session->ust_session);
3521 /*
3522 * Currently, the statedump in UST always returns 0.
3523 */
3524 if (ret < 0) {
3525 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
3526 ERR("Failed to regenerate the UST statedump");
3527 goto end;
3528 }
3529 }
3530 DBG("Cmd regenerate statedump for session %s", session->name);
3531 ret = LTTNG_OK;
3532
3533 end:
3534 return ret;
3535 }
3536
3537 /*
3538 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3539 * snapshot output is *not* set with a remote destination.
3540 *
3541 * Return 0 on success or a LTTNG_ERR code.
3542 */
3543 static int set_relayd_for_snapshot(struct consumer_output *consumer,
3544 struct snapshot_output *snap_output, struct ltt_session *session)
3545 {
3546 int ret = LTTNG_OK;
3547 struct lttng_ht_iter iter;
3548 struct consumer_socket *socket;
3549
3550 assert(consumer);
3551 assert(snap_output);
3552 assert(session);
3553
3554 DBG2("Set relayd object from snapshot output");
3555
3556 /* Ignore if snapshot consumer output is not network. */
3557 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3558 goto error;
3559 }
3560
3561 /*
3562 * For each consumer socket, create and send the relayd object of the
3563 * snapshot output.
3564 */
3565 rcu_read_lock();
3566 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3567 socket, node.node) {
3568 ret = send_consumer_relayd_sockets(0, session->id,
3569 snap_output->consumer, socket,
3570 session->name, session->hostname,
3571 session->live_timer);
3572 if (ret != LTTNG_OK) {
3573 rcu_read_unlock();
3574 goto error;
3575 }
3576 }
3577 rcu_read_unlock();
3578
3579 error:
3580 return ret;
3581 }
3582
3583 /*
3584 * Record a kernel snapshot.
3585 *
3586 * Return LTTNG_OK on success or a LTTNG_ERR code.
3587 */
3588 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
3589 struct snapshot_output *output, struct ltt_session *session,
3590 int wait, uint64_t nb_packets_per_stream)
3591 {
3592 int ret;
3593
3594 assert(ksess);
3595 assert(output);
3596 assert(session);
3597
3598
3599 /*
3600 * Copy kernel session sockets so we can communicate with the right
3601 * consumer for the snapshot record command.
3602 */
3603 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3604 if (ret < 0) {
3605 ret = LTTNG_ERR_NOMEM;
3606 goto error;
3607 }
3608
3609 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
3610 if (ret != LTTNG_OK) {
3611 goto error_snapshot;
3612 }
3613
3614 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
3615 if (ret != LTTNG_OK) {
3616 goto error_snapshot;
3617 }
3618
3619 ret = LTTNG_OK;
3620 goto end;
3621
3622 error_snapshot:
3623 /* Clean up copied sockets so this output can use some other later on. */
3624 consumer_destroy_output_sockets(output->consumer);
3625 error:
3626 end:
3627 return ret;
3628 }
3629
3630 /*
3631 * Record a UST snapshot.
3632 *
3633 * Return 0 on success or a LTTNG_ERR error code.
3634 */
3635 static int record_ust_snapshot(struct ltt_ust_session *usess,
3636 struct snapshot_output *output, struct ltt_session *session,
3637 int wait, uint64_t nb_packets_per_stream)
3638 {
3639 int ret;
3640
3641 assert(usess);
3642 assert(output);
3643 assert(session);
3644
3645 /*
3646 * Copy UST session sockets so we can communicate with the right
3647 * consumer for the snapshot record command.
3648 */
3649 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3650 if (ret < 0) {
3651 ret = LTTNG_ERR_NOMEM;
3652 goto error;
3653 }
3654
3655 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3656 if (ret != LTTNG_OK) {
3657 goto error_snapshot;
3658 }
3659
3660 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
3661 if (ret < 0) {
3662 switch (-ret) {
3663 case EINVAL:
3664 ret = LTTNG_ERR_INVALID;
3665 break;
3666 default:
3667 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3668 break;
3669 }
3670 goto error_snapshot;
3671 }
3672
3673 ret = LTTNG_OK;
3674
3675 error_snapshot:
3676 /* Clean up copied sockets so this output can use some other later on. */
3677 consumer_destroy_output_sockets(output->consumer);
3678 error:
3679 return ret;
3680 }
3681
3682 static
3683 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3684 uint64_t cur_nr_packets)
3685 {
3686 uint64_t tot_size = 0;
3687
3688 if (session->kernel_session) {
3689 struct ltt_kernel_channel *chan;
3690 struct ltt_kernel_session *ksess = session->kernel_session;
3691
3692 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3693 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3694 /*
3695 * Don't take channel into account if we
3696 * already grab all its packets.
3697 */
3698 continue;
3699 }
3700 tot_size += chan->channel->attr.subbuf_size
3701 * chan->stream_count;
3702 }
3703 }
3704
3705 if (session->ust_session) {
3706 struct ltt_ust_session *usess = session->ust_session;
3707
3708 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3709 cur_nr_packets);
3710 }
3711
3712 return tot_size;
3713 }
3714
3715 /*
3716 * Calculate the number of packets we can grab from each stream that
3717 * fits within the overall snapshot max size.
3718 *
3719 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3720 * the number of packets per stream.
3721 *
3722 * TODO: this approach is not perfect: we consider the worse case
3723 * (packet filling the sub-buffers) as an upper bound, but we could do
3724 * better if we do this calculation while we actually grab the packet
3725 * content: we would know how much padding we don't actually store into
3726 * the file.
3727 *
3728 * This algorithm is currently bounded by the number of packets per
3729 * stream.
3730 *
3731 * Since we call this algorithm before actually grabbing the data, it's
3732 * an approximation: for instance, applications could appear/disappear
3733 * in between this call and actually grabbing data.
3734 */
3735 static
3736 int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
3737 {
3738 int64_t size_left;
3739 uint64_t cur_nb_packets = 0;
3740
3741 if (!max_size) {
3742 return 0; /* Infinite */
3743 }
3744
3745 size_left = max_size;
3746 for (;;) {
3747 uint64_t one_more_packet_tot_size;
3748
3749 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3750 cur_nb_packets);
3751 if (!one_more_packet_tot_size) {
3752 /* We are already grabbing all packets. */
3753 break;
3754 }
3755 size_left -= one_more_packet_tot_size;
3756 if (size_left < 0) {
3757 break;
3758 }
3759 cur_nb_packets++;
3760 }
3761 if (!cur_nb_packets) {
3762 /* Not enough room to grab one packet of each stream, error. */
3763 return -1;
3764 }
3765 return cur_nb_packets;
3766 }
3767
3768 /*
3769 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3770 *
3771 * The wait parameter is ignored so this call always wait for the snapshot to
3772 * complete before returning.
3773 *
3774 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3775 */
3776 int cmd_snapshot_record(struct ltt_session *session,
3777 struct lttng_snapshot_output *output, int wait)
3778 {
3779 int ret = LTTNG_OK;
3780 unsigned int use_tmp_output = 0;
3781 struct snapshot_output tmp_output;
3782 unsigned int snapshot_success = 0;
3783 char datetime[16];
3784
3785 assert(session);
3786 assert(output);
3787
3788 DBG("Cmd snapshot record for session %s", session->name);
3789
3790 /* Get the datetime for the snapshot output directory. */
3791 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime,
3792 sizeof(datetime));
3793 if (!ret) {
3794 ret = LTTNG_ERR_INVALID;
3795 goto error;
3796 }
3797
3798 /*
3799 * Permission denied to create an output if the session is not
3800 * set in no output mode.
3801 */
3802 if (session->output_traces) {
3803 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3804 goto error;
3805 }
3806
3807 /* The session needs to be started at least once. */
3808 if (!session->has_been_started) {
3809 ret = LTTNG_ERR_START_SESSION_ONCE;
3810 goto error;
3811 }
3812
3813 /* Use temporary output for the session. */
3814 if (*output->ctrl_url != '\0') {
3815 ret = snapshot_output_init(output->max_size, output->name,
3816 output->ctrl_url, output->data_url, session->consumer,
3817 &tmp_output, NULL);
3818 if (ret < 0) {
3819 if (ret == -ENOMEM) {
3820 ret = LTTNG_ERR_NOMEM;
3821 } else {
3822 ret = LTTNG_ERR_INVALID;
3823 }
3824 goto error;
3825 }
3826 /* Use the global session count for the temporary snapshot. */
3827 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3828
3829 /* Use the global datetime */
3830 memcpy(tmp_output.datetime, datetime, sizeof(datetime));
3831 use_tmp_output = 1;
3832 }
3833
3834 if (use_tmp_output) {
3835 int64_t nb_packets_per_stream;
3836
3837 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3838 tmp_output.max_size);
3839 if (nb_packets_per_stream < 0) {
3840 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3841 goto error;
3842 }
3843
3844 if (session->kernel_session) {
3845 ret = record_kernel_snapshot(session->kernel_session,
3846 &tmp_output, session,
3847 wait, nb_packets_per_stream);
3848 if (ret != LTTNG_OK) {
3849 goto error;
3850 }
3851 }
3852
3853 if (session->ust_session) {
3854 ret = record_ust_snapshot(session->ust_session,
3855 &tmp_output, session,
3856 wait, nb_packets_per_stream);
3857 if (ret != LTTNG_OK) {
3858 goto error;
3859 }
3860 }
3861
3862 snapshot_success = 1;
3863 } else {
3864 struct snapshot_output *sout;
3865 struct lttng_ht_iter iter;
3866
3867 rcu_read_lock();
3868 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3869 &iter.iter, sout, node.node) {
3870 int64_t nb_packets_per_stream;
3871
3872 /*
3873 * Make a local copy of the output and assign the possible
3874 * temporary value given by the caller.
3875 */
3876 memset(&tmp_output, 0, sizeof(tmp_output));
3877 memcpy(&tmp_output, sout, sizeof(tmp_output));
3878
3879 if (output->max_size != (uint64_t) -1ULL) {
3880 tmp_output.max_size = output->max_size;
3881 }
3882
3883 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3884 tmp_output.max_size);
3885 if (nb_packets_per_stream < 0) {
3886 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3887 rcu_read_unlock();
3888 goto error;
3889 }
3890
3891 /* Use temporary name. */
3892 if (*output->name != '\0') {
3893 if (lttng_strncpy(tmp_output.name, output->name,
3894 sizeof(tmp_output.name))) {
3895 ret = LTTNG_ERR_INVALID;
3896 rcu_read_unlock();
3897 goto error;
3898 }
3899 }
3900
3901 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3902 memcpy(tmp_output.datetime, datetime, sizeof(datetime));
3903
3904 if (session->kernel_session) {
3905 ret = record_kernel_snapshot(session->kernel_session,
3906 &tmp_output, session,
3907 wait, nb_packets_per_stream);
3908 if (ret != LTTNG_OK) {
3909 rcu_read_unlock();
3910 goto error;
3911 }
3912 }
3913
3914 if (session->ust_session) {
3915 ret = record_ust_snapshot(session->ust_session,
3916 &tmp_output, session,
3917 wait, nb_packets_per_stream);
3918 if (ret != LTTNG_OK) {
3919 rcu_read_unlock();
3920 goto error;
3921 }
3922 }
3923 snapshot_success = 1;
3924 }
3925 rcu_read_unlock();
3926 }
3927
3928 if (snapshot_success) {
3929 session->snapshot.nb_snapshot++;
3930 } else {
3931 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3932 }
3933
3934 error:
3935 return ret;
3936 }
3937
3938 /*
3939 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3940 */
3941 int cmd_set_session_shm_path(struct ltt_session *session,
3942 const char *shm_path)
3943 {
3944 /* Safety net */
3945 assert(session);
3946
3947 /*
3948 * Can only set shm path before session is started.
3949 */
3950 if (session->has_been_started) {
3951 return LTTNG_ERR_SESSION_STARTED;
3952 }
3953
3954 strncpy(session->shm_path, shm_path,
3955 sizeof(session->shm_path));
3956 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3957
3958 return 0;
3959 }
3960
3961 /*
3962 * Init command subsystem.
3963 */
3964 void cmd_init(void)
3965 {
3966 /*
3967 * Set network sequence index to 1 for streams to match a relayd
3968 * socket on the consumer side.
3969 */
3970 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3971 relayd_net_seq_idx = 1;
3972 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3973
3974 DBG("Command subsystem initialized");
3975 }
LTTng tools - Deliverables
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