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Fix: delete metadata stream before destroying it
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <inttypes.h>
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
23
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
29
30 #include "channel.h"
31 #include "consumer.h"
32 #include "event.h"
33 #include "health-sessiond.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38
39 #include "cmd.h"
40
41 /*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
46 */
47 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48 static uint64_t relayd_net_seq_idx;
49
50 /*
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
53 */
54 static int build_network_session_path(char *dst, size_t size,
55 struct ltt_session *session)
56 {
57 int ret, kdata_port, udata_port;
58 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
59 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
60
61 assert(session);
62 assert(dst);
63
64 memset(tmp_urls, 0, sizeof(tmp_urls));
65 memset(tmp_uurl, 0, sizeof(tmp_uurl));
66
67 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
68
69 if (session->kernel_session && session->kernel_session->consumer) {
70 kuri = &session->kernel_session->consumer->dst.net.control;
71 kdata_port = session->kernel_session->consumer->dst.net.data.port;
72 }
73
74 if (session->ust_session && session->ust_session->consumer) {
75 uuri = &session->ust_session->consumer->dst.net.control;
76 udata_port = session->ust_session->consumer->dst.net.data.port;
77 }
78
79 if (uuri == NULL && kuri == NULL) {
80 uri = &session->consumer->dst.net.control;
81 kdata_port = session->consumer->dst.net.data.port;
82 } else if (kuri && uuri) {
83 ret = uri_compare(kuri, uuri);
84 if (ret) {
85 /* Not Equal */
86 uri = kuri;
87 /* Build uuri URL string */
88 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
89 if (ret < 0) {
90 goto error;
91 }
92 } else {
93 uri = kuri;
94 }
95 } else if (kuri && uuri == NULL) {
96 uri = kuri;
97 } else if (uuri && kuri == NULL) {
98 uri = uuri;
99 }
100
101 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
102 if (ret < 0) {
103 goto error;
104 }
105
106 /*
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 * to print.
109 */
110 if (*tmp_uurl != '\0') {
111 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls, kdata_port, tmp_uurl, udata_port);
113 } else {
114 int dport;
115 if (kuri || (!kuri && !uuri)) {
116 dport = kdata_port;
117 } else {
118 /* No kernel URI, use the UST port. */
119 dport = udata_port;
120 }
121 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
122 }
123
124 error:
125 return ret;
126 }
127
128 /*
129 * Fill lttng_channel array of all channels.
130 */
131 static void list_lttng_channels(int domain, struct ltt_session *session,
132 struct lttng_channel *channels)
133 {
134 int i = 0;
135 struct ltt_kernel_channel *kchan;
136
137 DBG("Listing channels for session %s", session->name);
138
139 switch (domain) {
140 case LTTNG_DOMAIN_KERNEL:
141 /* Kernel channels */
142 if (session->kernel_session != NULL) {
143 cds_list_for_each_entry(kchan,
144 &session->kernel_session->channel_list.head, list) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
147 channels[i].enabled = kchan->enabled;
148 i++;
149 }
150 }
151 break;
152 case LTTNG_DOMAIN_UST:
153 {
154 struct lttng_ht_iter iter;
155 struct ltt_ust_channel *uchan;
156
157 rcu_read_lock();
158 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
159 &iter.iter, uchan, node.node) {
160 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
161 channels[i].attr.overwrite = uchan->attr.overwrite;
162 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
163 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
164 channels[i].attr.switch_timer_interval =
165 uchan->attr.switch_timer_interval;
166 channels[i].attr.read_timer_interval =
167 uchan->attr.read_timer_interval;
168 channels[i].enabled = uchan->enabled;
169 switch (uchan->attr.output) {
170 case LTTNG_UST_MMAP:
171 default:
172 channels[i].attr.output = LTTNG_EVENT_MMAP;
173 break;
174 }
175 i++;
176 }
177 rcu_read_unlock();
178 break;
179 }
180 default:
181 break;
182 }
183 }
184
185 /*
186 * Create a list of JUL domain events.
187 *
188 * Return number of events in list on success or else a negative value.
189 */
190 static int list_lttng_jul_events(struct jul_domain *dom,
191 struct lttng_event **events)
192 {
193 int i = 0, ret = 0;
194 unsigned int nb_event = 0;
195 struct jul_event *event;
196 struct lttng_event *tmp_events;
197 struct lttng_ht_iter iter;
198
199 assert(dom);
200 assert(events);
201
202 DBG3("Listing JUL events");
203
204 nb_event = lttng_ht_get_count(dom->events);
205 if (nb_event == 0) {
206 ret = nb_event;
207 goto error;
208 }
209
210 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
211 if (!tmp_events) {
212 PERROR("zmalloc JUL events session");
213 ret = -LTTNG_ERR_FATAL;
214 goto error;
215 }
216
217 rcu_read_lock();
218 cds_lfht_for_each_entry(dom->events->ht, &iter.iter, event, node.node) {
219 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
220 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
221 tmp_events[i].enabled = event->enabled;
222 i++;
223 }
224 rcu_read_unlock();
225
226 *events = tmp_events;
227 ret = nb_event;
228
229 error:
230 assert(nb_event == i);
231 return ret;
232 }
233
234 /*
235 * Create a list of ust global domain events.
236 */
237 static int list_lttng_ust_global_events(char *channel_name,
238 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
239 {
240 int i = 0, ret = 0;
241 unsigned int nb_event = 0;
242 struct lttng_ht_iter iter;
243 struct lttng_ht_node_str *node;
244 struct ltt_ust_channel *uchan;
245 struct ltt_ust_event *uevent;
246 struct lttng_event *tmp;
247
248 DBG("Listing UST global events for channel %s", channel_name);
249
250 rcu_read_lock();
251
252 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
253 node = lttng_ht_iter_get_node_str(&iter);
254 if (node == NULL) {
255 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
256 goto error;
257 }
258
259 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
260
261 nb_event += lttng_ht_get_count(uchan->events);
262
263 if (nb_event == 0) {
264 ret = nb_event;
265 goto error;
266 }
267
268 DBG3("Listing UST global %d events", nb_event);
269
270 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
271 if (tmp == NULL) {
272 ret = LTTNG_ERR_FATAL;
273 goto error;
274 }
275
276 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
277 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
278 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
279 tmp[i].enabled = uevent->enabled;
280
281 switch (uevent->attr.instrumentation) {
282 case LTTNG_UST_TRACEPOINT:
283 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
284 break;
285 case LTTNG_UST_PROBE:
286 tmp[i].type = LTTNG_EVENT_PROBE;
287 break;
288 case LTTNG_UST_FUNCTION:
289 tmp[i].type = LTTNG_EVENT_FUNCTION;
290 break;
291 }
292
293 tmp[i].loglevel = uevent->attr.loglevel;
294 switch (uevent->attr.loglevel_type) {
295 case LTTNG_UST_LOGLEVEL_ALL:
296 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
297 break;
298 case LTTNG_UST_LOGLEVEL_RANGE:
299 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
300 break;
301 case LTTNG_UST_LOGLEVEL_SINGLE:
302 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
303 break;
304 }
305 if (uevent->filter) {
306 tmp[i].filter = 1;
307 }
308 if (uevent->exclusion) {
309 tmp[i].exclusion = 1;
310 }
311 i++;
312 }
313
314 ret = nb_event;
315 *events = tmp;
316
317 error:
318 rcu_read_unlock();
319 return ret;
320 }
321
322 /*
323 * Fill lttng_event array of all kernel events in the channel.
324 */
325 static int list_lttng_kernel_events(char *channel_name,
326 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
327 {
328 int i = 0, ret;
329 unsigned int nb_event;
330 struct ltt_kernel_event *event;
331 struct ltt_kernel_channel *kchan;
332
333 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
334 if (kchan == NULL) {
335 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
336 goto error;
337 }
338
339 nb_event = kchan->event_count;
340
341 DBG("Listing events for channel %s", kchan->channel->name);
342
343 if (nb_event == 0) {
344 goto end;
345 }
346
347 *events = zmalloc(nb_event * sizeof(struct lttng_event));
348 if (*events == NULL) {
349 ret = LTTNG_ERR_FATAL;
350 goto error;
351 }
352
353 /* Kernel channels */
354 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
355 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
356 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
357 (*events)[i].enabled = event->enabled;
358
359 switch (event->event->instrumentation) {
360 case LTTNG_KERNEL_TRACEPOINT:
361 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
362 break;
363 case LTTNG_KERNEL_KRETPROBE:
364 (*events)[i].type = LTTNG_EVENT_FUNCTION;
365 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
366 sizeof(struct lttng_kernel_kprobe));
367 break;
368 case LTTNG_KERNEL_KPROBE:
369 (*events)[i].type = LTTNG_EVENT_PROBE;
370 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
371 sizeof(struct lttng_kernel_kprobe));
372 break;
373 case LTTNG_KERNEL_FUNCTION:
374 (*events)[i].type = LTTNG_EVENT_FUNCTION;
375 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
376 sizeof(struct lttng_kernel_function));
377 break;
378 case LTTNG_KERNEL_NOOP:
379 (*events)[i].type = LTTNG_EVENT_NOOP;
380 break;
381 case LTTNG_KERNEL_SYSCALL:
382 (*events)[i].type = LTTNG_EVENT_SYSCALL;
383 break;
384 case LTTNG_KERNEL_ALL:
385 assert(0);
386 break;
387 }
388 i++;
389 }
390
391 end:
392 return nb_event;
393
394 error:
395 /* Negate the error code to differentiate the size from an error */
396 return -ret;
397 }
398
399 /*
400 * Add URI so the consumer output object. Set the correct path depending on the
401 * domain adding the default trace directory.
402 */
403 static int add_uri_to_consumer(struct consumer_output *consumer,
404 struct lttng_uri *uri, int domain, const char *session_name)
405 {
406 int ret = LTTNG_OK;
407 const char *default_trace_dir;
408
409 assert(uri);
410
411 if (consumer == NULL) {
412 DBG("No consumer detected. Don't add URI. Stopping.");
413 ret = LTTNG_ERR_NO_CONSUMER;
414 goto error;
415 }
416
417 switch (domain) {
418 case LTTNG_DOMAIN_KERNEL:
419 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
420 break;
421 case LTTNG_DOMAIN_UST:
422 default_trace_dir = DEFAULT_UST_TRACE_DIR;
423 break;
424 default:
425 /*
426 * This case is possible is we try to add the URI to the global tracing
427 * session consumer object which in this case there is no subdir.
428 */
429 default_trace_dir = "";
430 }
431
432 switch (uri->dtype) {
433 case LTTNG_DST_IPV4:
434 case LTTNG_DST_IPV6:
435 DBG2("Setting network URI to consumer");
436
437 if (consumer->type == CONSUMER_DST_NET) {
438 if ((uri->stype == LTTNG_STREAM_CONTROL &&
439 consumer->dst.net.control_isset) ||
440 (uri->stype == LTTNG_STREAM_DATA &&
441 consumer->dst.net.data_isset)) {
442 ret = LTTNG_ERR_URL_EXIST;
443 goto error;
444 }
445 } else {
446 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
447 }
448
449 consumer->type = CONSUMER_DST_NET;
450
451 /* Set URI into consumer output object */
452 ret = consumer_set_network_uri(consumer, uri);
453 if (ret < 0) {
454 ret = -ret;
455 goto error;
456 } else if (ret == 1) {
457 /*
458 * URI was the same in the consumer so we do not append the subdir
459 * again so to not duplicate output dir.
460 */
461 goto error;
462 }
463
464 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
465 ret = consumer_set_subdir(consumer, session_name);
466 if (ret < 0) {
467 ret = LTTNG_ERR_FATAL;
468 goto error;
469 }
470 }
471
472 if (uri->stype == LTTNG_STREAM_CONTROL) {
473 /* On a new subdir, reappend the default trace dir. */
474 strncat(consumer->subdir, default_trace_dir,
475 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
476 DBG3("Append domain trace name to subdir %s", consumer->subdir);
477 }
478
479 break;
480 case LTTNG_DST_PATH:
481 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
482 memset(consumer->dst.trace_path, 0,
483 sizeof(consumer->dst.trace_path));
484 strncpy(consumer->dst.trace_path, uri->dst.path,
485 sizeof(consumer->dst.trace_path));
486 /* Append default trace dir */
487 strncat(consumer->dst.trace_path, default_trace_dir,
488 sizeof(consumer->dst.trace_path) -
489 strlen(consumer->dst.trace_path) - 1);
490 /* Flag consumer as local. */
491 consumer->type = CONSUMER_DST_LOCAL;
492 break;
493 }
494
495 ret = LTTNG_OK;
496
497 error:
498 return ret;
499 }
500
501 /*
502 * Init tracing by creating trace directory and sending fds kernel consumer.
503 */
504 static int init_kernel_tracing(struct ltt_kernel_session *session)
505 {
506 int ret = 0;
507 struct lttng_ht_iter iter;
508 struct consumer_socket *socket;
509
510 assert(session);
511
512 rcu_read_lock();
513
514 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
515 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
516 socket, node.node) {
517 pthread_mutex_lock(socket->lock);
518 ret = kernel_consumer_send_session(socket, session);
519 pthread_mutex_unlock(socket->lock);
520 if (ret < 0) {
521 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
522 goto error;
523 }
524 }
525 }
526
527 error:
528 rcu_read_unlock();
529 return ret;
530 }
531
532 /*
533 * Create a socket to the relayd using the URI.
534 *
535 * On success, the relayd_sock pointer is set to the created socket.
536 * Else, it's stays untouched and a lttcomm error code is returned.
537 */
538 static int create_connect_relayd(struct lttng_uri *uri,
539 struct lttcomm_relayd_sock **relayd_sock)
540 {
541 int ret;
542 struct lttcomm_relayd_sock *rsock;
543
544 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
545 RELAYD_VERSION_COMM_MINOR);
546 if (!rsock) {
547 ret = LTTNG_ERR_FATAL;
548 goto error;
549 }
550
551 /*
552 * Connect to relayd so we can proceed with a session creation. This call
553 * can possibly block for an arbitrary amount of time to set the health
554 * state to be in poll execution.
555 */
556 health_poll_entry();
557 ret = relayd_connect(rsock);
558 health_poll_exit();
559 if (ret < 0) {
560 ERR("Unable to reach lttng-relayd");
561 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
562 goto free_sock;
563 }
564
565 /* Create socket for control stream. */
566 if (uri->stype == LTTNG_STREAM_CONTROL) {
567 DBG3("Creating relayd stream socket from URI");
568
569 /* Check relayd version */
570 ret = relayd_version_check(rsock);
571 if (ret < 0) {
572 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
573 goto close_sock;
574 }
575 } else if (uri->stype == LTTNG_STREAM_DATA) {
576 DBG3("Creating relayd data socket from URI");
577 } else {
578 /* Command is not valid */
579 ERR("Relayd invalid stream type: %d", uri->stype);
580 ret = LTTNG_ERR_INVALID;
581 goto close_sock;
582 }
583
584 *relayd_sock = rsock;
585
586 return LTTNG_OK;
587
588 close_sock:
589 /* The returned value is not useful since we are on an error path. */
590 (void) relayd_close(rsock);
591 free_sock:
592 free(rsock);
593 error:
594 return ret;
595 }
596
597 /*
598 * Connect to the relayd using URI and send the socket to the right consumer.
599 */
600 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
601 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
602 struct consumer_socket *consumer_sock,
603 char *session_name, char *hostname, int session_live_timer)
604 {
605 int ret;
606 struct lttcomm_relayd_sock *rsock = NULL;
607
608 /* Connect to relayd and make version check if uri is the control. */
609 ret = create_connect_relayd(relayd_uri, &rsock);
610 if (ret != LTTNG_OK) {
611 goto error;
612 }
613 assert(rsock);
614
615 /* Set the network sequence index if not set. */
616 if (consumer->net_seq_index == (uint64_t) -1ULL) {
617 pthread_mutex_lock(&relayd_net_seq_idx_lock);
618 /*
619 * Increment net_seq_idx because we are about to transfer the
620 * new relayd socket to the consumer.
621 * Assign unique key so the consumer can match streams.
622 */
623 consumer->net_seq_index = ++relayd_net_seq_idx;
624 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
625 }
626
627 /* Send relayd socket to consumer. */
628 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
629 relayd_uri->stype, session_id,
630 session_name, hostname, session_live_timer);
631 if (ret < 0) {
632 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
633 goto close_sock;
634 }
635
636 /* Flag that the corresponding socket was sent. */
637 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
638 consumer_sock->control_sock_sent = 1;
639 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
640 consumer_sock->data_sock_sent = 1;
641 }
642
643 ret = LTTNG_OK;
644
645 /*
646 * Close socket which was dup on the consumer side. The session daemon does
647 * NOT keep track of the relayd socket(s) once transfer to the consumer.
648 */
649
650 close_sock:
651 (void) relayd_close(rsock);
652 free(rsock);
653
654 error:
655 if (ret != LTTNG_OK) {
656 /*
657 * The consumer output for this session should not be used anymore
658 * since the relayd connection failed thus making any tracing or/and
659 * streaming not usable.
660 */
661 consumer->enabled = 0;
662 }
663 return ret;
664 }
665
666 /*
667 * Send both relayd sockets to a specific consumer and domain. This is a
668 * helper function to facilitate sending the information to the consumer for a
669 * session.
670 */
671 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
672 struct consumer_output *consumer, struct consumer_socket *sock,
673 char *session_name, char *hostname, int session_live_timer)
674 {
675 int ret = LTTNG_OK;
676
677 assert(consumer);
678 assert(sock);
679
680 /* Sending control relayd socket. */
681 if (!sock->control_sock_sent) {
682 ret = send_consumer_relayd_socket(domain, session_id,
683 &consumer->dst.net.control, consumer, sock,
684 session_name, hostname, session_live_timer);
685 if (ret != LTTNG_OK) {
686 goto error;
687 }
688 }
689
690 /* Sending data relayd socket. */
691 if (!sock->data_sock_sent) {
692 ret = send_consumer_relayd_socket(domain, session_id,
693 &consumer->dst.net.data, consumer, sock,
694 session_name, hostname, session_live_timer);
695 if (ret != LTTNG_OK) {
696 goto error;
697 }
698 }
699
700 error:
701 return ret;
702 }
703
704 /*
705 * Setup relayd connections for a tracing session. First creates the socket to
706 * the relayd and send them to the right domain consumer. Consumer type MUST be
707 * network.
708 */
709 int cmd_setup_relayd(struct ltt_session *session)
710 {
711 int ret = LTTNG_OK;
712 struct ltt_ust_session *usess;
713 struct ltt_kernel_session *ksess;
714 struct consumer_socket *socket;
715 struct lttng_ht_iter iter;
716
717 assert(session);
718
719 usess = session->ust_session;
720 ksess = session->kernel_session;
721
722 DBG("Setting relayd for session %s", session->name);
723
724 rcu_read_lock();
725
726 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
727 && usess->consumer->enabled) {
728 /* For each consumer socket, send relayd sockets */
729 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
730 socket, node.node) {
731 pthread_mutex_lock(socket->lock);
732 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
733 usess->consumer, socket,
734 session->name, session->hostname,
735 session->live_timer);
736 pthread_mutex_unlock(socket->lock);
737 if (ret != LTTNG_OK) {
738 goto error;
739 }
740 /* Session is now ready for network streaming. */
741 session->net_handle = 1;
742 }
743 }
744
745 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
746 && ksess->consumer->enabled) {
747 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
748 socket, node.node) {
749 pthread_mutex_lock(socket->lock);
750 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
751 ksess->consumer, socket,
752 session->name, session->hostname,
753 session->live_timer);
754 pthread_mutex_unlock(socket->lock);
755 if (ret != LTTNG_OK) {
756 goto error;
757 }
758 /* Session is now ready for network streaming. */
759 session->net_handle = 1;
760 }
761 }
762
763 error:
764 rcu_read_unlock();
765 return ret;
766 }
767
768 /*
769 * Start a kernel session by opening all necessary streams.
770 */
771 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
772 {
773 int ret;
774 struct ltt_kernel_channel *kchan;
775
776 /* Open kernel metadata */
777 if (ksess->metadata == NULL && ksess->output_traces) {
778 ret = kernel_open_metadata(ksess);
779 if (ret < 0) {
780 ret = LTTNG_ERR_KERN_META_FAIL;
781 goto error;
782 }
783 }
784
785 /* Open kernel metadata stream */
786 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
787 ret = kernel_open_metadata_stream(ksess);
788 if (ret < 0) {
789 ERR("Kernel create metadata stream failed");
790 ret = LTTNG_ERR_KERN_STREAM_FAIL;
791 goto error;
792 }
793 }
794
795 /* For each channel */
796 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
797 if (kchan->stream_count == 0) {
798 ret = kernel_open_channel_stream(kchan);
799 if (ret < 0) {
800 ret = LTTNG_ERR_KERN_STREAM_FAIL;
801 goto error;
802 }
803 /* Update the stream global counter */
804 ksess->stream_count_global += ret;
805 }
806 }
807
808 /* Setup kernel consumer socket and send fds to it */
809 ret = init_kernel_tracing(ksess);
810 if (ret != 0) {
811 ret = LTTNG_ERR_KERN_START_FAIL;
812 goto error;
813 }
814
815 /* This start the kernel tracing */
816 ret = kernel_start_session(ksess);
817 if (ret < 0) {
818 ret = LTTNG_ERR_KERN_START_FAIL;
819 goto error;
820 }
821
822 /* Quiescent wait after starting trace */
823 kernel_wait_quiescent(kernel_tracer_fd);
824
825 ksess->started = 1;
826
827 ret = LTTNG_OK;
828
829 error:
830 return ret;
831 }
832
833 /*
834 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
835 */
836 int cmd_disable_channel(struct ltt_session *session, int domain,
837 char *channel_name)
838 {
839 int ret;
840 struct ltt_ust_session *usess;
841
842 usess = session->ust_session;
843
844 rcu_read_lock();
845
846 switch (domain) {
847 case LTTNG_DOMAIN_KERNEL:
848 {
849 ret = channel_kernel_disable(session->kernel_session,
850 channel_name);
851 if (ret != LTTNG_OK) {
852 goto error;
853 }
854
855 kernel_wait_quiescent(kernel_tracer_fd);
856 break;
857 }
858 case LTTNG_DOMAIN_UST:
859 {
860 struct ltt_ust_channel *uchan;
861 struct lttng_ht *chan_ht;
862
863 chan_ht = usess->domain_global.channels;
864
865 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
866 if (uchan == NULL) {
867 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
868 goto error;
869 }
870
871 ret = channel_ust_disable(usess, uchan);
872 if (ret != LTTNG_OK) {
873 goto error;
874 }
875 break;
876 }
877 #if 0
878 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
879 case LTTNG_DOMAIN_UST_EXEC_NAME:
880 case LTTNG_DOMAIN_UST_PID:
881 #endif
882 default:
883 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
884 goto error;
885 }
886
887 ret = LTTNG_OK;
888
889 error:
890 rcu_read_unlock();
891 return ret;
892 }
893
894 /*
895 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
896 *
897 * The wpipe arguments is used as a notifier for the kernel thread.
898 */
899 int cmd_enable_channel(struct ltt_session *session,
900 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
901 {
902 int ret;
903 struct ltt_ust_session *usess = session->ust_session;
904 struct lttng_ht *chan_ht;
905
906 assert(session);
907 assert(attr);
908 assert(domain);
909
910 DBG("Enabling channel %s for session %s", attr->name, session->name);
911
912 rcu_read_lock();
913
914 /*
915 * Don't try to enable a channel if the session has been started at
916 * some point in time before. The tracer does not allow it.
917 */
918 if (session->started) {
919 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
920 goto error;
921 }
922
923 /*
924 * If the session is a live session, remove the switch timer, the
925 * live timer does the same thing but sends also synchronisation
926 * beacons for inactive streams.
927 */
928 if (session->live_timer > 0) {
929 attr->attr.live_timer_interval = session->live_timer;
930 attr->attr.switch_timer_interval = 0;
931 }
932
933 switch (domain->type) {
934 case LTTNG_DOMAIN_KERNEL:
935 {
936 struct ltt_kernel_channel *kchan;
937
938 kchan = trace_kernel_get_channel_by_name(attr->name,
939 session->kernel_session);
940 if (kchan == NULL) {
941 /*
942 * Don't try to create a channel if the session
943 * has been started at some point in time
944 * before. The tracer does not allow it.
945 */
946 if (session->started) {
947 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
948 goto error;
949 }
950 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
951 if (attr->name[0] != '\0') {
952 session->kernel_session->has_non_default_channel = 1;
953 }
954 } else {
955 ret = channel_kernel_enable(session->kernel_session, kchan);
956 }
957
958 if (ret != LTTNG_OK) {
959 goto error;
960 }
961
962 kernel_wait_quiescent(kernel_tracer_fd);
963 break;
964 }
965 case LTTNG_DOMAIN_UST:
966 {
967 struct ltt_ust_channel *uchan;
968
969 chan_ht = usess->domain_global.channels;
970
971 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
972 if (uchan == NULL) {
973 /*
974 * Don't try to create a channel if the session
975 * has been started at some point in time
976 * before. The tracer does not allow it.
977 */
978 if (session->started) {
979 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
980 goto error;
981 }
982 ret = channel_ust_create(usess, attr, domain->buf_type);
983 if (attr->name[0] != '\0') {
984 usess->has_non_default_channel = 1;
985 }
986 } else {
987 ret = channel_ust_enable(usess, uchan);
988 }
989 break;
990 }
991 default:
992 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
993 goto error;
994 }
995
996 error:
997 rcu_read_unlock();
998 return ret;
999 }
1000
1001
1002 /*
1003 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1004 */
1005 int cmd_disable_event(struct ltt_session *session, int domain,
1006 char *channel_name, char *event_name)
1007 {
1008 int ret;
1009
1010 rcu_read_lock();
1011
1012 switch (domain) {
1013 case LTTNG_DOMAIN_KERNEL:
1014 {
1015 struct ltt_kernel_channel *kchan;
1016 struct ltt_kernel_session *ksess;
1017
1018 ksess = session->kernel_session;
1019
1020 /*
1021 * If a non-default channel has been created in the
1022 * session, explicitely require that -c chan_name needs
1023 * to be provided.
1024 */
1025 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1026 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1027 goto error;
1028 }
1029
1030 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1031 if (kchan == NULL) {
1032 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1033 goto error;
1034 }
1035
1036 ret = event_kernel_disable_tracepoint(kchan, event_name);
1037 if (ret != LTTNG_OK) {
1038 goto error;
1039 }
1040
1041 kernel_wait_quiescent(kernel_tracer_fd);
1042 break;
1043 }
1044 case LTTNG_DOMAIN_UST:
1045 {
1046 struct ltt_ust_channel *uchan;
1047 struct ltt_ust_session *usess;
1048
1049 usess = session->ust_session;
1050
1051 /*
1052 * If a non-default channel has been created in the
1053 * session, explicitely require that -c chan_name needs
1054 * to be provided.
1055 */
1056 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1057 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1058 goto error;
1059 }
1060
1061 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1062 channel_name);
1063 if (uchan == NULL) {
1064 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1065 goto error;
1066 }
1067
1068 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1069 if (ret != LTTNG_OK) {
1070 goto error;
1071 }
1072
1073 DBG3("Disable UST event %s in channel %s completed", event_name,
1074 channel_name);
1075 break;
1076 }
1077 case LTTNG_DOMAIN_JUL:
1078 {
1079 struct ltt_ust_session *usess = session->ust_session;
1080
1081 assert(usess);
1082
1083 ret = event_jul_disable(usess, event_name);
1084 if (ret != LTTNG_OK) {
1085 goto error;
1086 }
1087
1088 break;
1089 }
1090 #if 0
1091 case LTTNG_DOMAIN_UST_EXEC_NAME:
1092 case LTTNG_DOMAIN_UST_PID:
1093 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1094 #endif
1095 default:
1096 ret = LTTNG_ERR_UND;
1097 goto error;
1098 }
1099
1100 ret = LTTNG_OK;
1101
1102 error:
1103 rcu_read_unlock();
1104 return ret;
1105 }
1106
1107 /*
1108 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1109 */
1110 int cmd_disable_event_all(struct ltt_session *session, int domain,
1111 char *channel_name)
1112 {
1113 int ret;
1114
1115 rcu_read_lock();
1116
1117 switch (domain) {
1118 case LTTNG_DOMAIN_KERNEL:
1119 {
1120 struct ltt_kernel_session *ksess;
1121 struct ltt_kernel_channel *kchan;
1122
1123 ksess = session->kernel_session;
1124
1125 /*
1126 * If a non-default channel has been created in the
1127 * session, explicitely require that -c chan_name needs
1128 * to be provided.
1129 */
1130 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1131 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1132 goto error;
1133 }
1134
1135 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1136 if (kchan == NULL) {
1137 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1138 goto error;
1139 }
1140
1141 ret = event_kernel_disable_all(kchan);
1142 if (ret != LTTNG_OK) {
1143 goto error;
1144 }
1145
1146 kernel_wait_quiescent(kernel_tracer_fd);
1147 break;
1148 }
1149 case LTTNG_DOMAIN_UST:
1150 {
1151 struct ltt_ust_session *usess;
1152 struct ltt_ust_channel *uchan;
1153
1154 usess = session->ust_session;
1155
1156 /*
1157 * If a non-default channel has been created in the
1158 * session, explicitely require that -c chan_name needs
1159 * to be provided.
1160 */
1161 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1162 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1163 goto error;
1164 }
1165
1166 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1167 channel_name);
1168 if (uchan == NULL) {
1169 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1170 goto error;
1171 }
1172
1173 ret = event_ust_disable_all_tracepoints(usess, uchan);
1174 if (ret != 0) {
1175 goto error;
1176 }
1177
1178 DBG3("Disable all UST events in channel %s completed", channel_name);
1179
1180 break;
1181 }
1182 case LTTNG_DOMAIN_JUL:
1183 {
1184 struct ltt_ust_session *usess = session->ust_session;
1185
1186 assert(usess);
1187
1188 ret = event_jul_disable_all(usess);
1189 if (ret != LTTNG_OK) {
1190 goto error;
1191 }
1192
1193 break;
1194 }
1195 #if 0
1196 case LTTNG_DOMAIN_UST_EXEC_NAME:
1197 case LTTNG_DOMAIN_UST_PID:
1198 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1199 #endif
1200 default:
1201 ret = LTTNG_ERR_UND;
1202 goto error;
1203 }
1204
1205 ret = LTTNG_OK;
1206
1207 error:
1208 rcu_read_unlock();
1209 return ret;
1210 }
1211
1212 /*
1213 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1214 */
1215 int cmd_add_context(struct ltt_session *session, int domain,
1216 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1217 {
1218 int ret, chan_kern_created = 0, chan_ust_created = 0;
1219
1220 switch (domain) {
1221 case LTTNG_DOMAIN_KERNEL:
1222 assert(session->kernel_session);
1223
1224 if (session->kernel_session->channel_count == 0) {
1225 /* Create default channel */
1226 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1227 if (ret != LTTNG_OK) {
1228 goto error;
1229 }
1230 chan_kern_created = 1;
1231 }
1232 /* Add kernel context to kernel tracer */
1233 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1234 if (ret != LTTNG_OK) {
1235 goto error;
1236 }
1237 break;
1238 case LTTNG_DOMAIN_UST:
1239 {
1240 struct ltt_ust_session *usess = session->ust_session;
1241 unsigned int chan_count;
1242
1243 assert(usess);
1244
1245 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1246 if (chan_count == 0) {
1247 struct lttng_channel *attr;
1248 /* Create default channel */
1249 attr = channel_new_default_attr(domain, usess->buffer_type);
1250 if (attr == NULL) {
1251 ret = LTTNG_ERR_FATAL;
1252 goto error;
1253 }
1254
1255 ret = channel_ust_create(usess, attr, usess->buffer_type);
1256 if (ret != LTTNG_OK) {
1257 free(attr);
1258 goto error;
1259 }
1260 free(attr);
1261 chan_ust_created = 1;
1262 }
1263
1264 ret = context_ust_add(usess, domain, ctx, channel_name);
1265 if (ret != LTTNG_OK) {
1266 goto error;
1267 }
1268 break;
1269 }
1270 #if 0
1271 case LTTNG_DOMAIN_UST_EXEC_NAME:
1272 case LTTNG_DOMAIN_UST_PID:
1273 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1274 #endif
1275 default:
1276 ret = LTTNG_ERR_UND;
1277 goto error;
1278 }
1279
1280 return LTTNG_OK;
1281
1282 error:
1283 if (chan_kern_created) {
1284 struct ltt_kernel_channel *kchan =
1285 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1286 session->kernel_session);
1287 /* Created previously, this should NOT fail. */
1288 assert(kchan);
1289 kernel_destroy_channel(kchan);
1290 }
1291
1292 if (chan_ust_created) {
1293 struct ltt_ust_channel *uchan =
1294 trace_ust_find_channel_by_name(
1295 session->ust_session->domain_global.channels,
1296 DEFAULT_CHANNEL_NAME);
1297 /* Created previously, this should NOT fail. */
1298 assert(uchan);
1299 /* Remove from the channel list of the session. */
1300 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1301 uchan);
1302 trace_ust_destroy_channel(uchan);
1303 }
1304 return ret;
1305 }
1306
1307 /*
1308 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1309 */
1310 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1311 char *channel_name, struct lttng_event *event,
1312 struct lttng_filter_bytecode *filter,
1313 struct lttng_event_exclusion *exclusion,
1314 int wpipe)
1315 {
1316 int ret, channel_created = 0;
1317 struct lttng_channel *attr;
1318
1319 assert(session);
1320 assert(event);
1321 assert(channel_name);
1322
1323 rcu_read_lock();
1324
1325 switch (domain->type) {
1326 case LTTNG_DOMAIN_KERNEL:
1327 {
1328 struct ltt_kernel_channel *kchan;
1329
1330 /*
1331 * If a non-default channel has been created in the
1332 * session, explicitely require that -c chan_name needs
1333 * to be provided.
1334 */
1335 if (session->kernel_session->has_non_default_channel
1336 && channel_name[0] == '\0') {
1337 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1338 goto error;
1339 }
1340
1341 kchan = trace_kernel_get_channel_by_name(channel_name,
1342 session->kernel_session);
1343 if (kchan == NULL) {
1344 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1345 LTTNG_BUFFER_GLOBAL);
1346 if (attr == NULL) {
1347 ret = LTTNG_ERR_FATAL;
1348 goto error;
1349 }
1350 strncpy(attr->name, channel_name, sizeof(attr->name));
1351
1352 ret = cmd_enable_channel(session, domain, attr, wpipe);
1353 if (ret != LTTNG_OK) {
1354 free(attr);
1355 goto error;
1356 }
1357 free(attr);
1358
1359 channel_created = 1;
1360 }
1361
1362 /* Get the newly created kernel channel pointer */
1363 kchan = trace_kernel_get_channel_by_name(channel_name,
1364 session->kernel_session);
1365 if (kchan == NULL) {
1366 /* This sould not happen... */
1367 ret = LTTNG_ERR_FATAL;
1368 goto error;
1369 }
1370
1371 ret = event_kernel_enable_tracepoint(kchan, event);
1372 if (ret != LTTNG_OK) {
1373 if (channel_created) {
1374 /* Let's not leak a useless channel. */
1375 kernel_destroy_channel(kchan);
1376 }
1377 goto error;
1378 }
1379
1380 kernel_wait_quiescent(kernel_tracer_fd);
1381 break;
1382 }
1383 case LTTNG_DOMAIN_UST:
1384 {
1385 struct ltt_ust_channel *uchan;
1386 struct ltt_ust_session *usess = session->ust_session;
1387
1388 assert(usess);
1389
1390 /*
1391 * If a non-default channel has been created in the
1392 * session, explicitely require that -c chan_name needs
1393 * to be provided.
1394 */
1395 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1396 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1397 goto error;
1398 }
1399
1400 /* Get channel from global UST domain */
1401 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1402 channel_name);
1403 if (uchan == NULL) {
1404 /* Create default channel */
1405 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1406 usess->buffer_type);
1407 if (attr == NULL) {
1408 ret = LTTNG_ERR_FATAL;
1409 goto error;
1410 }
1411 strncpy(attr->name, channel_name, sizeof(attr->name));
1412
1413 ret = cmd_enable_channel(session, domain, attr, wpipe);
1414 if (ret != LTTNG_OK) {
1415 free(attr);
1416 goto error;
1417 }
1418 free(attr);
1419
1420 /* Get the newly created channel reference back */
1421 uchan = trace_ust_find_channel_by_name(
1422 usess->domain_global.channels, channel_name);
1423 assert(uchan);
1424 }
1425
1426 /* At this point, the session and channel exist on the tracer */
1427 ret = event_ust_enable_tracepoint(usess, uchan, event, filter, exclusion);
1428 if (ret != LTTNG_OK) {
1429 goto error;
1430 }
1431 break;
1432 }
1433 case LTTNG_DOMAIN_JUL:
1434 {
1435 struct lttng_event uevent;
1436 struct lttng_domain tmp_dom;
1437 struct ltt_ust_session *usess = session->ust_session;
1438
1439 assert(usess);
1440
1441 /* Create the default JUL tracepoint. */
1442 uevent.type = LTTNG_EVENT_TRACEPOINT;
1443 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1444 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1445 uevent.name[sizeof(uevent.name) - 1] = '\0';
1446
1447 /*
1448 * The domain type is changed because we are about to enable the
1449 * default channel and event for the JUL domain that are hardcoded.
1450 * This happens in the UST domain.
1451 */
1452 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1453 tmp_dom.type = LTTNG_DOMAIN_UST;
1454
1455 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1456 &uevent, NULL, NULL, wpipe);
1457 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1458 goto error;
1459 }
1460
1461 /* The wild card * means that everything should be enabled. */
1462 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1463 ret = event_jul_enable_all(usess);
1464 } else {
1465 ret = event_jul_enable(usess, event);
1466 }
1467 if (ret != LTTNG_OK) {
1468 goto error;
1469 }
1470
1471 break;
1472 }
1473 #if 0
1474 case LTTNG_DOMAIN_UST_EXEC_NAME:
1475 case LTTNG_DOMAIN_UST_PID:
1476 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1477 #endif
1478 default:
1479 ret = LTTNG_ERR_UND;
1480 goto error;
1481 }
1482
1483 ret = LTTNG_OK;
1484
1485 error:
1486 rcu_read_unlock();
1487 return ret;
1488 }
1489
1490 /*
1491 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1492 */
1493 int cmd_enable_event_all(struct ltt_session *session,
1494 struct lttng_domain *domain, char *channel_name, int event_type,
1495 struct lttng_filter_bytecode *filter, int wpipe)
1496 {
1497 int ret;
1498 struct lttng_channel *attr;
1499
1500 assert(session);
1501 assert(channel_name);
1502
1503 rcu_read_lock();
1504
1505 switch (domain->type) {
1506 case LTTNG_DOMAIN_KERNEL:
1507 {
1508 struct ltt_kernel_channel *kchan;
1509
1510 assert(session->kernel_session);
1511
1512 /*
1513 * If a non-default channel has been created in the
1514 * session, explicitely require that -c chan_name needs
1515 * to be provided.
1516 */
1517 if (session->kernel_session->has_non_default_channel
1518 && channel_name[0] == '\0') {
1519 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1520 goto error;
1521 }
1522
1523 kchan = trace_kernel_get_channel_by_name(channel_name,
1524 session->kernel_session);
1525 if (kchan == NULL) {
1526 /* Create default channel */
1527 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1528 LTTNG_BUFFER_GLOBAL);
1529 if (attr == NULL) {
1530 ret = LTTNG_ERR_FATAL;
1531 goto error;
1532 }
1533 strncpy(attr->name, channel_name, sizeof(attr->name));
1534
1535 ret = cmd_enable_channel(session, domain, attr, wpipe);
1536 if (ret != LTTNG_OK) {
1537 free(attr);
1538 goto error;
1539 }
1540 free(attr);
1541
1542 /* Get the newly created kernel channel pointer */
1543 kchan = trace_kernel_get_channel_by_name(channel_name,
1544 session->kernel_session);
1545 assert(kchan);
1546 }
1547
1548 switch (event_type) {
1549 case LTTNG_EVENT_SYSCALL:
1550 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1551 break;
1552 case LTTNG_EVENT_TRACEPOINT:
1553 /*
1554 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1555 * events already registered to the channel.
1556 */
1557 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1558 break;
1559 case LTTNG_EVENT_ALL:
1560 /* Enable syscalls and tracepoints */
1561 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1562 break;
1563 default:
1564 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1565 goto error;
1566 }
1567
1568 /* Manage return value */
1569 if (ret != LTTNG_OK) {
1570 /*
1571 * On error, cmd_enable_channel call will take care of destroying
1572 * the created channel if it was needed.
1573 */
1574 goto error;
1575 }
1576
1577 kernel_wait_quiescent(kernel_tracer_fd);
1578 break;
1579 }
1580 case LTTNG_DOMAIN_UST:
1581 {
1582 struct ltt_ust_channel *uchan;
1583 struct ltt_ust_session *usess = session->ust_session;
1584
1585 assert(usess);
1586
1587 /*
1588 * If a non-default channel has been created in the
1589 * session, explicitely require that -c chan_name needs
1590 * to be provided.
1591 */
1592 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1593 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1594 goto error;
1595 }
1596
1597 /* Get channel from global UST domain */
1598 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1599 channel_name);
1600 if (uchan == NULL) {
1601 /* Create default channel */
1602 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1603 usess->buffer_type);
1604 if (attr == NULL) {
1605 ret = LTTNG_ERR_FATAL;
1606 goto error;
1607 }
1608 strncpy(attr->name, channel_name, sizeof(attr->name));
1609
1610 ret = cmd_enable_channel(session, domain, attr, wpipe);
1611 if (ret != LTTNG_OK) {
1612 free(attr);
1613 goto error;
1614 }
1615 free(attr);
1616
1617 /* Get the newly created channel reference back */
1618 uchan = trace_ust_find_channel_by_name(
1619 usess->domain_global.channels, channel_name);
1620 assert(uchan);
1621 }
1622
1623 /* At this point, the session and channel exist on the tracer */
1624
1625 switch (event_type) {
1626 case LTTNG_EVENT_ALL:
1627 case LTTNG_EVENT_TRACEPOINT:
1628 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1629 if (ret != LTTNG_OK) {
1630 goto error;
1631 }
1632 break;
1633 default:
1634 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1635 goto error;
1636 }
1637
1638 /* Manage return value */
1639 if (ret != LTTNG_OK) {
1640 goto error;
1641 }
1642
1643 break;
1644 }
1645 case LTTNG_DOMAIN_JUL:
1646 {
1647 struct lttng_event uevent;
1648 struct lttng_domain tmp_dom;
1649 struct ltt_ust_session *usess = session->ust_session;
1650
1651 assert(usess);
1652
1653 /* Create the default JUL tracepoint. */
1654 uevent.type = LTTNG_EVENT_TRACEPOINT;
1655 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1656 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1657 uevent.name[sizeof(uevent.name) - 1] = '\0';
1658
1659 /*
1660 * The domain type is changed because we are about to enable the
1661 * default channel and event for the JUL domain that are hardcoded.
1662 * This happens in the UST domain.
1663 */
1664 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1665 tmp_dom.type = LTTNG_DOMAIN_UST;
1666
1667 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1668 &uevent, NULL, NULL, wpipe);
1669 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1670 goto error;
1671 }
1672
1673 ret = event_jul_enable_all(usess);
1674 if (ret != LTTNG_OK) {
1675 goto error;
1676 }
1677
1678 break;
1679 }
1680 #if 0
1681 case LTTNG_DOMAIN_UST_EXEC_NAME:
1682 case LTTNG_DOMAIN_UST_PID:
1683 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1684 #endif
1685 default:
1686 ret = LTTNG_ERR_UND;
1687 goto error;
1688 }
1689
1690 ret = LTTNG_OK;
1691
1692 error:
1693 rcu_read_unlock();
1694 return ret;
1695 }
1696
1697
1698 /*
1699 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1700 */
1701 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1702 {
1703 int ret;
1704 ssize_t nb_events = 0;
1705
1706 switch (domain) {
1707 case LTTNG_DOMAIN_KERNEL:
1708 nb_events = kernel_list_events(kernel_tracer_fd, events);
1709 if (nb_events < 0) {
1710 ret = LTTNG_ERR_KERN_LIST_FAIL;
1711 goto error;
1712 }
1713 break;
1714 case LTTNG_DOMAIN_UST:
1715 nb_events = ust_app_list_events(events);
1716 if (nb_events < 0) {
1717 ret = LTTNG_ERR_UST_LIST_FAIL;
1718 goto error;
1719 }
1720 break;
1721 case LTTNG_DOMAIN_JUL:
1722 nb_events = jul_list_events(events);
1723 if (nb_events < 0) {
1724 ret = LTTNG_ERR_UST_LIST_FAIL;
1725 goto error;
1726 }
1727 break;
1728 default:
1729 ret = LTTNG_ERR_UND;
1730 goto error;
1731 }
1732
1733 return nb_events;
1734
1735 error:
1736 /* Return negative value to differentiate return code */
1737 return -ret;
1738 }
1739
1740 /*
1741 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1742 */
1743 ssize_t cmd_list_tracepoint_fields(int domain,
1744 struct lttng_event_field **fields)
1745 {
1746 int ret;
1747 ssize_t nb_fields = 0;
1748
1749 switch (domain) {
1750 case LTTNG_DOMAIN_UST:
1751 nb_fields = ust_app_list_event_fields(fields);
1752 if (nb_fields < 0) {
1753 ret = LTTNG_ERR_UST_LIST_FAIL;
1754 goto error;
1755 }
1756 break;
1757 case LTTNG_DOMAIN_KERNEL:
1758 default: /* fall-through */
1759 ret = LTTNG_ERR_UND;
1760 goto error;
1761 }
1762
1763 return nb_fields;
1764
1765 error:
1766 /* Return negative value to differentiate return code */
1767 return -ret;
1768 }
1769
1770 /*
1771 * Command LTTNG_START_TRACE processed by the client thread.
1772 */
1773 int cmd_start_trace(struct ltt_session *session)
1774 {
1775 int ret;
1776 struct ltt_kernel_session *ksession;
1777 struct ltt_ust_session *usess;
1778
1779 assert(session);
1780
1781 /* Ease our life a bit ;) */
1782 ksession = session->kernel_session;
1783 usess = session->ust_session;
1784
1785 if (session->enabled) {
1786 /* Already started. */
1787 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1788 goto error;
1789 }
1790
1791 session->enabled = 1;
1792
1793 /* Kernel tracing */
1794 if (ksession != NULL) {
1795 ret = start_kernel_session(ksession, kernel_tracer_fd);
1796 if (ret != LTTNG_OK) {
1797 goto error;
1798 }
1799 }
1800
1801 /* Flag session that trace should start automatically */
1802 if (usess) {
1803 usess->start_trace = 1;
1804
1805 ret = ust_app_start_trace_all(usess);
1806 if (ret < 0) {
1807 ret = LTTNG_ERR_UST_START_FAIL;
1808 goto error;
1809 }
1810 }
1811
1812 session->started = 1;
1813
1814 ret = LTTNG_OK;
1815
1816 error:
1817 return ret;
1818 }
1819
1820 /*
1821 * Command LTTNG_STOP_TRACE processed by the client thread.
1822 */
1823 int cmd_stop_trace(struct ltt_session *session)
1824 {
1825 int ret;
1826 struct ltt_kernel_channel *kchan;
1827 struct ltt_kernel_session *ksession;
1828 struct ltt_ust_session *usess;
1829
1830 assert(session);
1831
1832 /* Short cut */
1833 ksession = session->kernel_session;
1834 usess = session->ust_session;
1835
1836 if (!session->enabled) {
1837 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1838 goto error;
1839 }
1840
1841 session->enabled = 0;
1842
1843 /* Kernel tracer */
1844 if (ksession && ksession->started) {
1845 DBG("Stop kernel tracing");
1846
1847 /* Flush metadata if exist */
1848 if (ksession->metadata_stream_fd >= 0) {
1849 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1850 if (ret < 0) {
1851 ERR("Kernel metadata flush failed");
1852 }
1853 }
1854
1855 /* Flush all buffers before stopping */
1856 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1857 ret = kernel_flush_buffer(kchan);
1858 if (ret < 0) {
1859 ERR("Kernel flush buffer error");
1860 }
1861 }
1862
1863 ret = kernel_stop_session(ksession);
1864 if (ret < 0) {
1865 ret = LTTNG_ERR_KERN_STOP_FAIL;
1866 goto error;
1867 }
1868
1869 kernel_wait_quiescent(kernel_tracer_fd);
1870
1871 ksession->started = 0;
1872 }
1873
1874 if (usess && usess->start_trace) {
1875 usess->start_trace = 0;
1876
1877 ret = ust_app_stop_trace_all(usess);
1878 if (ret < 0) {
1879 ret = LTTNG_ERR_UST_STOP_FAIL;
1880 goto error;
1881 }
1882 }
1883
1884 ret = LTTNG_OK;
1885
1886 error:
1887 return ret;
1888 }
1889
1890 /*
1891 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1892 */
1893 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1894 size_t nb_uri, struct lttng_uri *uris)
1895 {
1896 int ret, i;
1897 struct ltt_kernel_session *ksess = session->kernel_session;
1898 struct ltt_ust_session *usess = session->ust_session;
1899 struct consumer_output *consumer = NULL;
1900
1901 assert(session);
1902 assert(uris);
1903 assert(nb_uri > 0);
1904
1905 /* Can't enable consumer after session started. */
1906 if (session->enabled) {
1907 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1908 goto error;
1909 }
1910
1911 /*
1912 * This case switch makes sure the domain session has a temporary consumer
1913 * so the URL can be set.
1914 */
1915 switch (domain) {
1916 case 0:
1917 /* Code flow error. A session MUST always have a consumer object */
1918 assert(session->consumer);
1919 /*
1920 * The URL will be added to the tracing session consumer instead of a
1921 * specific domain consumer.
1922 */
1923 consumer = session->consumer;
1924 break;
1925 case LTTNG_DOMAIN_KERNEL:
1926 /* Code flow error if we don't have a kernel session here. */
1927 assert(ksess);
1928 assert(ksess->consumer);
1929 consumer = ksess->consumer;
1930 break;
1931 case LTTNG_DOMAIN_UST:
1932 /* Code flow error if we don't have a kernel session here. */
1933 assert(usess);
1934 assert(usess->consumer);
1935 consumer = usess->consumer;
1936 break;
1937 }
1938
1939 for (i = 0; i < nb_uri; i++) {
1940 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1941 if (ret != LTTNG_OK) {
1942 goto error;
1943 }
1944 }
1945
1946 /* All good! */
1947 ret = LTTNG_OK;
1948
1949 error:
1950 return ret;
1951 }
1952
1953 /*
1954 * Command LTTNG_CREATE_SESSION processed by the client thread.
1955 */
1956 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1957 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
1958 {
1959 int ret;
1960 struct ltt_session *session;
1961
1962 assert(name);
1963 assert(creds);
1964
1965 /*
1966 * Verify if the session already exist
1967 *
1968 * XXX: There is no need for the session lock list here since the caller
1969 * (process_client_msg) is holding it. We might want to change that so a
1970 * single command does not lock the entire session list.
1971 */
1972 session = session_find_by_name(name);
1973 if (session != NULL) {
1974 ret = LTTNG_ERR_EXIST_SESS;
1975 goto find_error;
1976 }
1977
1978 /* Create tracing session in the registry */
1979 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1980 LTTNG_SOCK_GET_GID_CRED(creds));
1981 if (ret != LTTNG_OK) {
1982 goto session_error;
1983 }
1984
1985 /*
1986 * Get the newly created session pointer back
1987 *
1988 * XXX: There is no need for the session lock list here since the caller
1989 * (process_client_msg) is holding it. We might want to change that so a
1990 * single command does not lock the entire session list.
1991 */
1992 session = session_find_by_name(name);
1993 assert(session);
1994
1995 session->live_timer = live_timer;
1996 /* Create default consumer output for the session not yet created. */
1997 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1998 if (session->consumer == NULL) {
1999 ret = LTTNG_ERR_FATAL;
2000 goto consumer_error;
2001 }
2002
2003 if (uris) {
2004 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2005 if (ret != LTTNG_OK) {
2006 goto consumer_error;
2007 }
2008 session->output_traces = 1;
2009 } else {
2010 session->output_traces = 0;
2011 DBG2("Session %s created with no output", session->name);
2012 }
2013
2014 session->consumer->enabled = 1;
2015
2016 return LTTNG_OK;
2017
2018 consumer_error:
2019 session_destroy(session);
2020 session_error:
2021 find_error:
2022 return ret;
2023 }
2024
2025 /*
2026 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2027 */
2028 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2029 size_t nb_uri, lttng_sock_cred *creds)
2030 {
2031 int ret;
2032 struct ltt_session *session;
2033 struct snapshot_output *new_output = NULL;
2034
2035 assert(name);
2036 assert(creds);
2037
2038 /*
2039 * Create session in no output mode with URIs set to NULL. The uris we've
2040 * received are for a default snapshot output if one.
2041 */
2042 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2043 if (ret != LTTNG_OK) {
2044 goto error;
2045 }
2046
2047 /* Get the newly created session pointer back. This should NEVER fail. */
2048 session = session_find_by_name(name);
2049 assert(session);
2050
2051 /* Flag session for snapshot mode. */
2052 session->snapshot_mode = 1;
2053
2054 /* Skip snapshot output creation if no URI is given. */
2055 if (nb_uri == 0) {
2056 goto end;
2057 }
2058
2059 new_output = snapshot_output_alloc();
2060 if (!new_output) {
2061 ret = LTTNG_ERR_NOMEM;
2062 goto error_snapshot_alloc;
2063 }
2064
2065 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2066 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2067 if (ret < 0) {
2068 if (ret == -ENOMEM) {
2069 ret = LTTNG_ERR_NOMEM;
2070 } else {
2071 ret = LTTNG_ERR_INVALID;
2072 }
2073 goto error_snapshot;
2074 }
2075
2076 rcu_read_lock();
2077 snapshot_add_output(&session->snapshot, new_output);
2078 rcu_read_unlock();
2079
2080 end:
2081 return LTTNG_OK;
2082
2083 error_snapshot:
2084 snapshot_output_destroy(new_output);
2085 error_snapshot_alloc:
2086 session_destroy(session);
2087 error:
2088 return ret;
2089 }
2090
2091 /*
2092 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2093 */
2094 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2095 {
2096 int ret;
2097 struct ltt_ust_session *usess;
2098 struct ltt_kernel_session *ksess;
2099
2100 /* Safety net */
2101 assert(session);
2102
2103 usess = session->ust_session;
2104 ksess = session->kernel_session;
2105
2106 /* Clean kernel session teardown */
2107 kernel_destroy_session(ksess);
2108
2109 /* UST session teardown */
2110 if (usess) {
2111 /* Close any relayd session */
2112 consumer_output_send_destroy_relayd(usess->consumer);
2113
2114 /* Destroy every UST application related to this session. */
2115 ret = ust_app_destroy_trace_all(usess);
2116 if (ret) {
2117 ERR("Error in ust_app_destroy_trace_all");
2118 }
2119
2120 /* Clean up the rest. */
2121 trace_ust_destroy_session(usess);
2122 }
2123
2124 /*
2125 * Must notify the kernel thread here to update it's poll set in order to
2126 * remove the channel(s)' fd just destroyed.
2127 */
2128 ret = notify_thread_pipe(wpipe);
2129 if (ret < 0) {
2130 PERROR("write kernel poll pipe");
2131 }
2132
2133 ret = session_destroy(session);
2134
2135 return ret;
2136 }
2137
2138 /*
2139 * Command LTTNG_CALIBRATE processed by the client thread.
2140 */
2141 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2142 {
2143 int ret;
2144
2145 switch (domain) {
2146 case LTTNG_DOMAIN_KERNEL:
2147 {
2148 struct lttng_kernel_calibrate kcalibrate;
2149
2150 switch (calibrate->type) {
2151 case LTTNG_CALIBRATE_FUNCTION:
2152 default:
2153 /* Default and only possible calibrate option. */
2154 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2155 break;
2156 }
2157
2158 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2159 if (ret < 0) {
2160 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2161 goto error;
2162 }
2163 break;
2164 }
2165 case LTTNG_DOMAIN_UST:
2166 {
2167 struct lttng_ust_calibrate ucalibrate;
2168
2169 switch (calibrate->type) {
2170 case LTTNG_CALIBRATE_FUNCTION:
2171 default:
2172 /* Default and only possible calibrate option. */
2173 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2174 break;
2175 }
2176
2177 ret = ust_app_calibrate_glb(&ucalibrate);
2178 if (ret < 0) {
2179 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2180 goto error;
2181 }
2182 break;
2183 }
2184 default:
2185 ret = LTTNG_ERR_UND;
2186 goto error;
2187 }
2188
2189 ret = LTTNG_OK;
2190
2191 error:
2192 return ret;
2193 }
2194
2195 /*
2196 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2197 */
2198 int cmd_register_consumer(struct ltt_session *session, int domain,
2199 const char *sock_path, struct consumer_data *cdata)
2200 {
2201 int ret, sock;
2202 struct consumer_socket *socket = NULL;
2203
2204 assert(session);
2205 assert(cdata);
2206 assert(sock_path);
2207
2208 switch (domain) {
2209 case LTTNG_DOMAIN_KERNEL:
2210 {
2211 struct ltt_kernel_session *ksess = session->kernel_session;
2212
2213 assert(ksess);
2214
2215 /* Can't register a consumer if there is already one */
2216 if (ksess->consumer_fds_sent != 0) {
2217 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2218 goto error;
2219 }
2220
2221 sock = lttcomm_connect_unix_sock(sock_path);
2222 if (sock < 0) {
2223 ret = LTTNG_ERR_CONNECT_FAIL;
2224 goto error;
2225 }
2226 cdata->cmd_sock = sock;
2227
2228 socket = consumer_allocate_socket(&cdata->cmd_sock);
2229 if (socket == NULL) {
2230 ret = close(sock);
2231 if (ret < 0) {
2232 PERROR("close register consumer");
2233 }
2234 cdata->cmd_sock = -1;
2235 ret = LTTNG_ERR_FATAL;
2236 goto error;
2237 }
2238
2239 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2240 if (socket->lock == NULL) {
2241 PERROR("zmalloc pthread mutex");
2242 ret = LTTNG_ERR_FATAL;
2243 goto error;
2244 }
2245 pthread_mutex_init(socket->lock, NULL);
2246 socket->registered = 1;
2247
2248 rcu_read_lock();
2249 consumer_add_socket(socket, ksess->consumer);
2250 rcu_read_unlock();
2251
2252 pthread_mutex_lock(&cdata->pid_mutex);
2253 cdata->pid = -1;
2254 pthread_mutex_unlock(&cdata->pid_mutex);
2255
2256 break;
2257 }
2258 default:
2259 /* TODO: Userspace tracing */
2260 ret = LTTNG_ERR_UND;
2261 goto error;
2262 }
2263
2264 return LTTNG_OK;
2265
2266 error:
2267 if (socket) {
2268 consumer_destroy_socket(socket);
2269 }
2270 return ret;
2271 }
2272
2273 /*
2274 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2275 */
2276 ssize_t cmd_list_domains(struct ltt_session *session,
2277 struct lttng_domain **domains)
2278 {
2279 int ret, index = 0;
2280 ssize_t nb_dom = 0;
2281
2282 if (session->kernel_session != NULL) {
2283 DBG3("Listing domains found kernel domain");
2284 nb_dom++;
2285 }
2286
2287 if (session->ust_session != NULL) {
2288 DBG3("Listing domains found UST global domain");
2289 nb_dom++;
2290
2291 if (session->ust_session->domain_jul.being_used) {
2292 nb_dom++;
2293 }
2294 }
2295
2296 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2297 if (*domains == NULL) {
2298 ret = LTTNG_ERR_FATAL;
2299 goto error;
2300 }
2301
2302 if (session->kernel_session != NULL) {
2303 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2304 index++;
2305 }
2306
2307 if (session->ust_session != NULL) {
2308 (*domains)[index].type = LTTNG_DOMAIN_UST;
2309 (*domains)[index].buf_type = session->ust_session->buffer_type;
2310 index++;
2311
2312 if (session->ust_session->domain_jul.being_used) {
2313 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2314 (*domains)[index].buf_type = session->ust_session->buffer_type;
2315 index++;
2316 }
2317 }
2318
2319 return nb_dom;
2320
2321 error:
2322 /* Return negative value to differentiate return code */
2323 return -ret;
2324 }
2325
2326
2327 /*
2328 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2329 */
2330 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2331 struct lttng_channel **channels)
2332 {
2333 int ret;
2334 ssize_t nb_chan = 0;
2335
2336 switch (domain) {
2337 case LTTNG_DOMAIN_KERNEL:
2338 if (session->kernel_session != NULL) {
2339 nb_chan = session->kernel_session->channel_count;
2340 }
2341 DBG3("Number of kernel channels %zd", nb_chan);
2342 if (nb_chan <= 0) {
2343 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2344 }
2345 break;
2346 case LTTNG_DOMAIN_UST:
2347 if (session->ust_session != NULL) {
2348 nb_chan = lttng_ht_get_count(
2349 session->ust_session->domain_global.channels);
2350 }
2351 DBG3("Number of UST global channels %zd", nb_chan);
2352 if (nb_chan <= 0) {
2353 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2354 }
2355 break;
2356 default:
2357 *channels = NULL;
2358 ret = LTTNG_ERR_UND;
2359 goto error;
2360 }
2361
2362 if (nb_chan > 0) {
2363 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2364 if (*channels == NULL) {
2365 ret = LTTNG_ERR_FATAL;
2366 goto error;
2367 }
2368
2369 list_lttng_channels(domain, session, *channels);
2370 } else {
2371 *channels = NULL;
2372 /* Ret value was set in the domain switch case */
2373 goto error;
2374 }
2375
2376 return nb_chan;
2377
2378 error:
2379 /* Return negative value to differentiate return code */
2380 return -ret;
2381 }
2382
2383 /*
2384 * Command LTTNG_LIST_EVENTS processed by the client thread.
2385 */
2386 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2387 char *channel_name, struct lttng_event **events)
2388 {
2389 int ret = 0;
2390 ssize_t nb_event = 0;
2391
2392 switch (domain) {
2393 case LTTNG_DOMAIN_KERNEL:
2394 if (session->kernel_session != NULL) {
2395 nb_event = list_lttng_kernel_events(channel_name,
2396 session->kernel_session, events);
2397 }
2398 break;
2399 case LTTNG_DOMAIN_UST:
2400 {
2401 if (session->ust_session != NULL) {
2402 nb_event = list_lttng_ust_global_events(channel_name,
2403 &session->ust_session->domain_global, events);
2404 }
2405 break;
2406 }
2407 case LTTNG_DOMAIN_JUL:
2408 if (session->ust_session) {
2409 nb_event = list_lttng_jul_events(
2410 &session->ust_session->domain_jul, events);
2411 }
2412 break;
2413 default:
2414 ret = LTTNG_ERR_UND;
2415 goto error;
2416 }
2417
2418 return nb_event;
2419
2420 error:
2421 /* Return negative value to differentiate return code */
2422 return -ret;
2423 }
2424
2425 /*
2426 * Using the session list, filled a lttng_session array to send back to the
2427 * client for session listing.
2428 *
2429 * The session list lock MUST be acquired before calling this function. Use
2430 * session_lock_list() and session_unlock_list().
2431 */
2432 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2433 gid_t gid)
2434 {
2435 int ret;
2436 unsigned int i = 0;
2437 struct ltt_session *session;
2438 struct ltt_session_list *list = session_get_list();
2439
2440 DBG("Getting all available session for UID %d GID %d",
2441 uid, gid);
2442 /*
2443 * Iterate over session list and append data after the control struct in
2444 * the buffer.
2445 */
2446 cds_list_for_each_entry(session, &list->head, list) {
2447 /*
2448 * Only list the sessions the user can control.
2449 */
2450 if (!session_access_ok(session, uid, gid)) {
2451 continue;
2452 }
2453
2454 struct ltt_kernel_session *ksess = session->kernel_session;
2455 struct ltt_ust_session *usess = session->ust_session;
2456
2457 if (session->consumer->type == CONSUMER_DST_NET ||
2458 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2459 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2460 ret = build_network_session_path(sessions[i].path,
2461 sizeof(sessions[i].path), session);
2462 } else {
2463 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2464 session->consumer->dst.trace_path);
2465 }
2466 if (ret < 0) {
2467 PERROR("snprintf session path");
2468 continue;
2469 }
2470
2471 strncpy(sessions[i].name, session->name, NAME_MAX);
2472 sessions[i].name[NAME_MAX - 1] = '\0';
2473 sessions[i].enabled = session->enabled;
2474 sessions[i].snapshot_mode = session->snapshot_mode;
2475 i++;
2476 }
2477 }
2478
2479 /*
2480 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2481 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2482 */
2483 int cmd_data_pending(struct ltt_session *session)
2484 {
2485 int ret;
2486 struct ltt_kernel_session *ksess = session->kernel_session;
2487 struct ltt_ust_session *usess = session->ust_session;
2488
2489 assert(session);
2490
2491 /* Session MUST be stopped to ask for data availability. */
2492 if (session->enabled) {
2493 ret = LTTNG_ERR_SESSION_STARTED;
2494 goto error;
2495 }
2496
2497 if (ksess && ksess->consumer) {
2498 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2499 if (ret == 1) {
2500 /* Data is still being extracted for the kernel. */
2501 goto error;
2502 }
2503 }
2504
2505 if (usess && usess->consumer) {
2506 ret = consumer_is_data_pending(usess->id, usess->consumer);
2507 if (ret == 1) {
2508 /* Data is still being extracted for the kernel. */
2509 goto error;
2510 }
2511 }
2512
2513 /* Data is ready to be read by a viewer */
2514 ret = 0;
2515
2516 error:
2517 return ret;
2518 }
2519
2520 /*
2521 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2522 *
2523 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2524 */
2525 int cmd_snapshot_add_output(struct ltt_session *session,
2526 struct lttng_snapshot_output *output, uint32_t *id)
2527 {
2528 int ret;
2529 struct snapshot_output *new_output;
2530
2531 assert(session);
2532 assert(output);
2533
2534 DBG("Cmd snapshot add output for session %s", session->name);
2535
2536 /*
2537 * Permission denied to create an output if the session is not
2538 * set in no output mode.
2539 */
2540 if (session->output_traces) {
2541 ret = LTTNG_ERR_EPERM;
2542 goto error;
2543 }
2544
2545 /* Only one output is allowed until we have the "tee" feature. */
2546 if (session->snapshot.nb_output == 1) {
2547 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2548 goto error;
2549 }
2550
2551 new_output = snapshot_output_alloc();
2552 if (!new_output) {
2553 ret = LTTNG_ERR_NOMEM;
2554 goto error;
2555 }
2556
2557 ret = snapshot_output_init(output->max_size, output->name,
2558 output->ctrl_url, output->data_url, session->consumer, new_output,
2559 &session->snapshot);
2560 if (ret < 0) {
2561 if (ret == -ENOMEM) {
2562 ret = LTTNG_ERR_NOMEM;
2563 } else {
2564 ret = LTTNG_ERR_INVALID;
2565 }
2566 goto free_error;
2567 }
2568
2569 rcu_read_lock();
2570 snapshot_add_output(&session->snapshot, new_output);
2571 if (id) {
2572 *id = new_output->id;
2573 }
2574 rcu_read_unlock();
2575
2576 return LTTNG_OK;
2577
2578 free_error:
2579 snapshot_output_destroy(new_output);
2580 error:
2581 return ret;
2582 }
2583
2584 /*
2585 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2586 *
2587 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2588 */
2589 int cmd_snapshot_del_output(struct ltt_session *session,
2590 struct lttng_snapshot_output *output)
2591 {
2592 int ret;
2593 struct snapshot_output *sout = NULL;
2594
2595 assert(session);
2596 assert(output);
2597
2598 rcu_read_lock();
2599
2600 /*
2601 * Permission denied to create an output if the session is not
2602 * set in no output mode.
2603 */
2604 if (session->output_traces) {
2605 ret = LTTNG_ERR_EPERM;
2606 goto error;
2607 }
2608
2609 if (output->id) {
2610 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2611 session->name);
2612 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2613 } else if (*output->name != '\0') {
2614 DBG("Cmd snapshot del output name %s for session %s", output->name,
2615 session->name);
2616 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2617 }
2618 if (!sout) {
2619 ret = LTTNG_ERR_INVALID;
2620 goto error;
2621 }
2622
2623 snapshot_delete_output(&session->snapshot, sout);
2624 snapshot_output_destroy(sout);
2625 ret = LTTNG_OK;
2626
2627 error:
2628 rcu_read_unlock();
2629 return ret;
2630 }
2631
2632 /*
2633 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2634 *
2635 * If no output is available, outputs is untouched and 0 is returned.
2636 *
2637 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2638 */
2639 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2640 struct lttng_snapshot_output **outputs)
2641 {
2642 int ret, idx = 0;
2643 struct lttng_snapshot_output *list;
2644 struct lttng_ht_iter iter;
2645 struct snapshot_output *output;
2646
2647 assert(session);
2648 assert(outputs);
2649
2650 DBG("Cmd snapshot list outputs for session %s", session->name);
2651
2652 /*
2653 * Permission denied to create an output if the session is not
2654 * set in no output mode.
2655 */
2656 if (session->output_traces) {
2657 ret = LTTNG_ERR_EPERM;
2658 goto error;
2659 }
2660
2661 if (session->snapshot.nb_output == 0) {
2662 ret = 0;
2663 goto error;
2664 }
2665
2666 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2667 if (!list) {
2668 ret = LTTNG_ERR_NOMEM;
2669 goto error;
2670 }
2671
2672 /* Copy list from session to the new list object. */
2673 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2674 output, node.node) {
2675 assert(output->consumer);
2676 list[idx].id = output->id;
2677 list[idx].max_size = output->max_size;
2678 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2679 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2680 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2681 sizeof(list[idx].ctrl_url));
2682 } else {
2683 /* Control URI. */
2684 ret = uri_to_str_url(&output->consumer->dst.net.control,
2685 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2686 if (ret < 0) {
2687 ret = LTTNG_ERR_NOMEM;
2688 goto free_error;
2689 }
2690
2691 /* Data URI. */
2692 ret = uri_to_str_url(&output->consumer->dst.net.data,
2693 list[idx].data_url, sizeof(list[idx].data_url));
2694 if (ret < 0) {
2695 ret = LTTNG_ERR_NOMEM;
2696 goto free_error;
2697 }
2698 }
2699 idx++;
2700 }
2701
2702 *outputs = list;
2703 return session->snapshot.nb_output;
2704
2705 free_error:
2706 free(list);
2707 error:
2708 return -ret;
2709 }
2710
2711 /*
2712 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2713 * snapshot output is *not* set with a remote destination.
2714 *
2715 * Return 0 on success or a LTTNG_ERR code.
2716 */
2717 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2718 struct snapshot_output *snap_output, struct ltt_session *session)
2719 {
2720 int ret = LTTNG_OK;
2721 struct lttng_ht_iter iter;
2722 struct consumer_socket *socket;
2723
2724 assert(consumer);
2725 assert(snap_output);
2726 assert(session);
2727
2728 DBG2("Set relayd object from snapshot output");
2729
2730 /* Ignore if snapshot consumer output is not network. */
2731 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2732 goto error;
2733 }
2734
2735 /*
2736 * For each consumer socket, create and send the relayd object of the
2737 * snapshot output.
2738 */
2739 rcu_read_lock();
2740 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2741 socket, node.node) {
2742 ret = send_consumer_relayd_sockets(0, session->id,
2743 snap_output->consumer, socket,
2744 session->name, session->hostname,
2745 session->live_timer);
2746 if (ret != LTTNG_OK) {
2747 rcu_read_unlock();
2748 goto error;
2749 }
2750 }
2751 rcu_read_unlock();
2752
2753 error:
2754 return ret;
2755 }
2756
2757 /*
2758 * Record a kernel snapshot.
2759 *
2760 * Return LTTNG_OK on success or a LTTNG_ERR code.
2761 */
2762 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2763 struct snapshot_output *output, struct ltt_session *session,
2764 int wait, int nb_streams)
2765 {
2766 int ret;
2767
2768 assert(ksess);
2769 assert(output);
2770 assert(session);
2771
2772 /* Get the datetime for the snapshot output directory. */
2773 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2774 sizeof(output->datetime));
2775 if (!ret) {
2776 ret = LTTNG_ERR_INVALID;
2777 goto error;
2778 }
2779
2780 /*
2781 * Copy kernel session sockets so we can communicate with the right
2782 * consumer for the snapshot record command.
2783 */
2784 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2785 if (ret < 0) {
2786 ret = LTTNG_ERR_NOMEM;
2787 goto error;
2788 }
2789
2790 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2791 if (ret != LTTNG_OK) {
2792 goto error_snapshot;
2793 }
2794
2795 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2796 if (ret != LTTNG_OK) {
2797 goto error_snapshot;
2798 }
2799
2800 ret = LTTNG_OK;
2801
2802 error_snapshot:
2803 /* Clean up copied sockets so this output can use some other later on. */
2804 consumer_destroy_output_sockets(output->consumer);
2805 error:
2806 return ret;
2807 }
2808
2809 /*
2810 * Record a UST snapshot.
2811 *
2812 * Return 0 on success or a LTTNG_ERR error code.
2813 */
2814 static int record_ust_snapshot(struct ltt_ust_session *usess,
2815 struct snapshot_output *output, struct ltt_session *session,
2816 int wait, int nb_streams)
2817 {
2818 int ret;
2819
2820 assert(usess);
2821 assert(output);
2822 assert(session);
2823
2824 /* Get the datetime for the snapshot output directory. */
2825 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2826 sizeof(output->datetime));
2827 if (!ret) {
2828 ret = LTTNG_ERR_INVALID;
2829 goto error;
2830 }
2831
2832 /*
2833 * Copy UST session sockets so we can communicate with the right
2834 * consumer for the snapshot record command.
2835 */
2836 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2837 if (ret < 0) {
2838 ret = LTTNG_ERR_NOMEM;
2839 goto error;
2840 }
2841
2842 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2843 if (ret != LTTNG_OK) {
2844 goto error_snapshot;
2845 }
2846
2847 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2848 if (ret < 0) {
2849 switch (-ret) {
2850 case EINVAL:
2851 ret = LTTNG_ERR_INVALID;
2852 break;
2853 case ENODATA:
2854 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2855 break;
2856 default:
2857 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2858 break;
2859 }
2860 goto error_snapshot;
2861 }
2862
2863 ret = LTTNG_OK;
2864
2865 error_snapshot:
2866 /* Clean up copied sockets so this output can use some other later on. */
2867 consumer_destroy_output_sockets(output->consumer);
2868 error:
2869 return ret;
2870 }
2871
2872 /*
2873 * Returns the total number of streams for a session or a negative value
2874 * on error.
2875 */
2876 static unsigned int get_total_nb_stream(struct ltt_session *session)
2877 {
2878 unsigned int total_streams = 0;
2879
2880 if (session->kernel_session) {
2881 struct ltt_kernel_session *ksess = session->kernel_session;
2882
2883 total_streams += ksess->stream_count_global;
2884 }
2885
2886 if (session->ust_session) {
2887 struct ltt_ust_session *usess = session->ust_session;
2888
2889 total_streams += ust_app_get_nb_stream(usess);
2890 }
2891
2892 return total_streams;
2893 }
2894
2895 /*
2896 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2897 *
2898 * The wait parameter is ignored so this call always wait for the snapshot to
2899 * complete before returning.
2900 *
2901 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2902 */
2903 int cmd_snapshot_record(struct ltt_session *session,
2904 struct lttng_snapshot_output *output, int wait)
2905 {
2906 int ret = LTTNG_OK;
2907 unsigned int use_tmp_output = 0;
2908 struct snapshot_output tmp_output;
2909 unsigned int nb_streams, snapshot_success = 0;
2910
2911 assert(session);
2912
2913 DBG("Cmd snapshot record for session %s", session->name);
2914
2915 /*
2916 * Permission denied to create an output if the session is not
2917 * set in no output mode.
2918 */
2919 if (session->output_traces) {
2920 ret = LTTNG_ERR_EPERM;
2921 goto error;
2922 }
2923
2924 /* The session needs to be started at least once. */
2925 if (!session->started) {
2926 ret = LTTNG_ERR_START_SESSION_ONCE;
2927 goto error;
2928 }
2929
2930 /* Use temporary output for the session. */
2931 if (output && *output->ctrl_url != '\0') {
2932 ret = snapshot_output_init(output->max_size, output->name,
2933 output->ctrl_url, output->data_url, session->consumer,
2934 &tmp_output, NULL);
2935 if (ret < 0) {
2936 if (ret == -ENOMEM) {
2937 ret = LTTNG_ERR_NOMEM;
2938 } else {
2939 ret = LTTNG_ERR_INVALID;
2940 }
2941 goto error;
2942 }
2943 /* Use the global session count for the temporary snapshot. */
2944 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2945 use_tmp_output = 1;
2946 }
2947
2948 /*
2949 * Get the total number of stream of that session which is used by the
2950 * maximum size of the snapshot feature.
2951 */
2952 nb_streams = get_total_nb_stream(session);
2953
2954 if (session->kernel_session) {
2955 struct ltt_kernel_session *ksess = session->kernel_session;
2956
2957 if (use_tmp_output) {
2958 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2959 wait, nb_streams);
2960 if (ret != LTTNG_OK) {
2961 goto error;
2962 }
2963 snapshot_success = 1;
2964 } else {
2965 struct snapshot_output *sout;
2966 struct lttng_ht_iter iter;
2967
2968 rcu_read_lock();
2969 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2970 &iter.iter, sout, node.node) {
2971 /*
2972 * Make a local copy of the output and assign the possible
2973 * temporary value given by the caller.
2974 */
2975 memset(&tmp_output, 0, sizeof(tmp_output));
2976 memcpy(&tmp_output, sout, sizeof(tmp_output));
2977
2978 /* Use temporary max size. */
2979 if (output->max_size != (uint64_t) -1ULL) {
2980 tmp_output.max_size = output->max_size;
2981 }
2982
2983 /* Use temporary name. */
2984 if (*output->name != '\0') {
2985 strncpy(tmp_output.name, output->name,
2986 sizeof(tmp_output.name));
2987 }
2988
2989 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2990
2991 ret = record_kernel_snapshot(ksess, &tmp_output,
2992 session, wait, nb_streams);
2993 if (ret != LTTNG_OK) {
2994 rcu_read_unlock();
2995 goto error;
2996 }
2997 snapshot_success = 1;
2998 }
2999 rcu_read_unlock();
3000 }
3001 }
3002
3003 if (session->ust_session) {
3004 struct ltt_ust_session *usess = session->ust_session;
3005
3006 if (use_tmp_output) {
3007 ret = record_ust_snapshot(usess, &tmp_output, session,
3008 wait, nb_streams);
3009 if (ret != LTTNG_OK) {
3010 goto error;
3011 }
3012 snapshot_success = 1;
3013 } else {
3014 struct snapshot_output *sout;
3015 struct lttng_ht_iter iter;
3016
3017 rcu_read_lock();
3018 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3019 &iter.iter, sout, node.node) {
3020 /*
3021 * Make a local copy of the output and assign the possible
3022 * temporary value given by the caller.
3023 */
3024 memset(&tmp_output, 0, sizeof(tmp_output));
3025 memcpy(&tmp_output, sout, sizeof(tmp_output));
3026
3027 /* Use temporary max size. */
3028 if (output->max_size != (uint64_t) -1ULL) {
3029 tmp_output.max_size = output->max_size;
3030 }
3031
3032 /* Use temporary name. */
3033 if (*output->name != '\0') {
3034 strncpy(tmp_output.name, output->name,
3035 sizeof(tmp_output.name));
3036 }
3037
3038 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3039
3040 ret = record_ust_snapshot(usess, &tmp_output, session,
3041 wait, nb_streams);
3042 if (ret != LTTNG_OK) {
3043 rcu_read_unlock();
3044 goto error;
3045 }
3046 snapshot_success = 1;
3047 }
3048 rcu_read_unlock();
3049 }
3050 }
3051
3052 if (snapshot_success) {
3053 session->snapshot.nb_snapshot++;
3054 } else {
3055 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3056 }
3057
3058 error:
3059 return ret;
3060 }
3061
3062 /*
3063 * Init command subsystem.
3064 */
3065 void cmd_init(void)
3066 {
3067 /*
3068 * Set network sequence index to 1 for streams to match a relayd
3069 * socket on the consumer side.
3070 */
3071 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3072 relayd_net_seq_idx = 1;
3073 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3074
3075 DBG("Command subsystem initialized");
3076 }
LTTng tools - Deliverables
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