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Fix: zero out data structure before using 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 memset(&uevent, 0, sizeof(uevent));
1443 uevent.type = LTTNG_EVENT_TRACEPOINT;
1444 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1445 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1446 uevent.name[sizeof(uevent.name) - 1] = '\0';
1447
1448 /*
1449 * The domain type is changed because we are about to enable the
1450 * default channel and event for the JUL domain that are hardcoded.
1451 * This happens in the UST domain.
1452 */
1453 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1454 tmp_dom.type = LTTNG_DOMAIN_UST;
1455
1456 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1457 &uevent, NULL, NULL, wpipe);
1458 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1459 goto error;
1460 }
1461
1462 /* The wild card * means that everything should be enabled. */
1463 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1464 ret = event_jul_enable_all(usess);
1465 } else {
1466 ret = event_jul_enable(usess, event);
1467 }
1468 if (ret != LTTNG_OK) {
1469 goto error;
1470 }
1471
1472 break;
1473 }
1474 #if 0
1475 case LTTNG_DOMAIN_UST_EXEC_NAME:
1476 case LTTNG_DOMAIN_UST_PID:
1477 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1478 #endif
1479 default:
1480 ret = LTTNG_ERR_UND;
1481 goto error;
1482 }
1483
1484 ret = LTTNG_OK;
1485
1486 error:
1487 rcu_read_unlock();
1488 return ret;
1489 }
1490
1491 /*
1492 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1493 */
1494 int cmd_enable_event_all(struct ltt_session *session,
1495 struct lttng_domain *domain, char *channel_name, int event_type,
1496 struct lttng_filter_bytecode *filter, int wpipe)
1497 {
1498 int ret;
1499 struct lttng_channel *attr;
1500
1501 assert(session);
1502 assert(channel_name);
1503
1504 rcu_read_lock();
1505
1506 switch (domain->type) {
1507 case LTTNG_DOMAIN_KERNEL:
1508 {
1509 struct ltt_kernel_channel *kchan;
1510
1511 assert(session->kernel_session);
1512
1513 /*
1514 * If a non-default channel has been created in the
1515 * session, explicitely require that -c chan_name needs
1516 * to be provided.
1517 */
1518 if (session->kernel_session->has_non_default_channel
1519 && channel_name[0] == '\0') {
1520 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1521 goto error;
1522 }
1523
1524 kchan = trace_kernel_get_channel_by_name(channel_name,
1525 session->kernel_session);
1526 if (kchan == NULL) {
1527 /* Create default channel */
1528 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1529 LTTNG_BUFFER_GLOBAL);
1530 if (attr == NULL) {
1531 ret = LTTNG_ERR_FATAL;
1532 goto error;
1533 }
1534 strncpy(attr->name, channel_name, sizeof(attr->name));
1535
1536 ret = cmd_enable_channel(session, domain, attr, wpipe);
1537 if (ret != LTTNG_OK) {
1538 free(attr);
1539 goto error;
1540 }
1541 free(attr);
1542
1543 /* Get the newly created kernel channel pointer */
1544 kchan = trace_kernel_get_channel_by_name(channel_name,
1545 session->kernel_session);
1546 assert(kchan);
1547 }
1548
1549 switch (event_type) {
1550 case LTTNG_EVENT_SYSCALL:
1551 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1552 break;
1553 case LTTNG_EVENT_TRACEPOINT:
1554 /*
1555 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1556 * events already registered to the channel.
1557 */
1558 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1559 break;
1560 case LTTNG_EVENT_ALL:
1561 /* Enable syscalls and tracepoints */
1562 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1563 break;
1564 default:
1565 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1566 goto error;
1567 }
1568
1569 /* Manage return value */
1570 if (ret != LTTNG_OK) {
1571 /*
1572 * On error, cmd_enable_channel call will take care of destroying
1573 * the created channel if it was needed.
1574 */
1575 goto error;
1576 }
1577
1578 kernel_wait_quiescent(kernel_tracer_fd);
1579 break;
1580 }
1581 case LTTNG_DOMAIN_UST:
1582 {
1583 struct ltt_ust_channel *uchan;
1584 struct ltt_ust_session *usess = session->ust_session;
1585
1586 assert(usess);
1587
1588 /*
1589 * If a non-default channel has been created in the
1590 * session, explicitely require that -c chan_name needs
1591 * to be provided.
1592 */
1593 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1594 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1595 goto error;
1596 }
1597
1598 /* Get channel from global UST domain */
1599 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1600 channel_name);
1601 if (uchan == NULL) {
1602 /* Create default channel */
1603 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1604 usess->buffer_type);
1605 if (attr == NULL) {
1606 ret = LTTNG_ERR_FATAL;
1607 goto error;
1608 }
1609 strncpy(attr->name, channel_name, sizeof(attr->name));
1610
1611 ret = cmd_enable_channel(session, domain, attr, wpipe);
1612 if (ret != LTTNG_OK) {
1613 free(attr);
1614 goto error;
1615 }
1616 free(attr);
1617
1618 /* Get the newly created channel reference back */
1619 uchan = trace_ust_find_channel_by_name(
1620 usess->domain_global.channels, channel_name);
1621 assert(uchan);
1622 }
1623
1624 /* At this point, the session and channel exist on the tracer */
1625
1626 switch (event_type) {
1627 case LTTNG_EVENT_ALL:
1628 case LTTNG_EVENT_TRACEPOINT:
1629 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1630 if (ret != LTTNG_OK) {
1631 goto error;
1632 }
1633 break;
1634 default:
1635 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1636 goto error;
1637 }
1638
1639 /* Manage return value */
1640 if (ret != LTTNG_OK) {
1641 goto error;
1642 }
1643
1644 break;
1645 }
1646 case LTTNG_DOMAIN_JUL:
1647 {
1648 struct lttng_event uevent;
1649 struct lttng_domain tmp_dom;
1650 struct ltt_ust_session *usess = session->ust_session;
1651
1652 assert(usess);
1653
1654 /* Create the default JUL tracepoint. */
1655 uevent.type = LTTNG_EVENT_TRACEPOINT;
1656 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1657 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1658 uevent.name[sizeof(uevent.name) - 1] = '\0';
1659
1660 /*
1661 * The domain type is changed because we are about to enable the
1662 * default channel and event for the JUL domain that are hardcoded.
1663 * This happens in the UST domain.
1664 */
1665 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1666 tmp_dom.type = LTTNG_DOMAIN_UST;
1667
1668 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1669 &uevent, NULL, NULL, wpipe);
1670 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1671 goto error;
1672 }
1673
1674 ret = event_jul_enable_all(usess);
1675 if (ret != LTTNG_OK) {
1676 goto error;
1677 }
1678
1679 break;
1680 }
1681 #if 0
1682 case LTTNG_DOMAIN_UST_EXEC_NAME:
1683 case LTTNG_DOMAIN_UST_PID:
1684 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1685 #endif
1686 default:
1687 ret = LTTNG_ERR_UND;
1688 goto error;
1689 }
1690
1691 ret = LTTNG_OK;
1692
1693 error:
1694 rcu_read_unlock();
1695 return ret;
1696 }
1697
1698
1699 /*
1700 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1701 */
1702 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1703 {
1704 int ret;
1705 ssize_t nb_events = 0;
1706
1707 switch (domain) {
1708 case LTTNG_DOMAIN_KERNEL:
1709 nb_events = kernel_list_events(kernel_tracer_fd, events);
1710 if (nb_events < 0) {
1711 ret = LTTNG_ERR_KERN_LIST_FAIL;
1712 goto error;
1713 }
1714 break;
1715 case LTTNG_DOMAIN_UST:
1716 nb_events = ust_app_list_events(events);
1717 if (nb_events < 0) {
1718 ret = LTTNG_ERR_UST_LIST_FAIL;
1719 goto error;
1720 }
1721 break;
1722 case LTTNG_DOMAIN_JUL:
1723 nb_events = jul_list_events(events);
1724 if (nb_events < 0) {
1725 ret = LTTNG_ERR_UST_LIST_FAIL;
1726 goto error;
1727 }
1728 break;
1729 default:
1730 ret = LTTNG_ERR_UND;
1731 goto error;
1732 }
1733
1734 return nb_events;
1735
1736 error:
1737 /* Return negative value to differentiate return code */
1738 return -ret;
1739 }
1740
1741 /*
1742 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1743 */
1744 ssize_t cmd_list_tracepoint_fields(int domain,
1745 struct lttng_event_field **fields)
1746 {
1747 int ret;
1748 ssize_t nb_fields = 0;
1749
1750 switch (domain) {
1751 case LTTNG_DOMAIN_UST:
1752 nb_fields = ust_app_list_event_fields(fields);
1753 if (nb_fields < 0) {
1754 ret = LTTNG_ERR_UST_LIST_FAIL;
1755 goto error;
1756 }
1757 break;
1758 case LTTNG_DOMAIN_KERNEL:
1759 default: /* fall-through */
1760 ret = LTTNG_ERR_UND;
1761 goto error;
1762 }
1763
1764 return nb_fields;
1765
1766 error:
1767 /* Return negative value to differentiate return code */
1768 return -ret;
1769 }
1770
1771 /*
1772 * Command LTTNG_START_TRACE processed by the client thread.
1773 */
1774 int cmd_start_trace(struct ltt_session *session)
1775 {
1776 int ret;
1777 struct ltt_kernel_session *ksession;
1778 struct ltt_ust_session *usess;
1779
1780 assert(session);
1781
1782 /* Ease our life a bit ;) */
1783 ksession = session->kernel_session;
1784 usess = session->ust_session;
1785
1786 if (session->enabled) {
1787 /* Already started. */
1788 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1789 goto error;
1790 }
1791
1792 session->enabled = 1;
1793
1794 /* Kernel tracing */
1795 if (ksession != NULL) {
1796 ret = start_kernel_session(ksession, kernel_tracer_fd);
1797 if (ret != LTTNG_OK) {
1798 goto error;
1799 }
1800 }
1801
1802 /* Flag session that trace should start automatically */
1803 if (usess) {
1804 usess->start_trace = 1;
1805
1806 ret = ust_app_start_trace_all(usess);
1807 if (ret < 0) {
1808 ret = LTTNG_ERR_UST_START_FAIL;
1809 goto error;
1810 }
1811 }
1812
1813 session->started = 1;
1814
1815 ret = LTTNG_OK;
1816
1817 error:
1818 return ret;
1819 }
1820
1821 /*
1822 * Command LTTNG_STOP_TRACE processed by the client thread.
1823 */
1824 int cmd_stop_trace(struct ltt_session *session)
1825 {
1826 int ret;
1827 struct ltt_kernel_channel *kchan;
1828 struct ltt_kernel_session *ksession;
1829 struct ltt_ust_session *usess;
1830
1831 assert(session);
1832
1833 /* Short cut */
1834 ksession = session->kernel_session;
1835 usess = session->ust_session;
1836
1837 if (!session->enabled) {
1838 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1839 goto error;
1840 }
1841
1842 session->enabled = 0;
1843
1844 /* Kernel tracer */
1845 if (ksession && ksession->started) {
1846 DBG("Stop kernel tracing");
1847
1848 /* Flush metadata if exist */
1849 if (ksession->metadata_stream_fd >= 0) {
1850 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1851 if (ret < 0) {
1852 ERR("Kernel metadata flush failed");
1853 }
1854 }
1855
1856 /* Flush all buffers before stopping */
1857 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1858 ret = kernel_flush_buffer(kchan);
1859 if (ret < 0) {
1860 ERR("Kernel flush buffer error");
1861 }
1862 }
1863
1864 ret = kernel_stop_session(ksession);
1865 if (ret < 0) {
1866 ret = LTTNG_ERR_KERN_STOP_FAIL;
1867 goto error;
1868 }
1869
1870 kernel_wait_quiescent(kernel_tracer_fd);
1871
1872 ksession->started = 0;
1873 }
1874
1875 if (usess && usess->start_trace) {
1876 usess->start_trace = 0;
1877
1878 ret = ust_app_stop_trace_all(usess);
1879 if (ret < 0) {
1880 ret = LTTNG_ERR_UST_STOP_FAIL;
1881 goto error;
1882 }
1883 }
1884
1885 ret = LTTNG_OK;
1886
1887 error:
1888 return ret;
1889 }
1890
1891 /*
1892 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1893 */
1894 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1895 size_t nb_uri, struct lttng_uri *uris)
1896 {
1897 int ret, i;
1898 struct ltt_kernel_session *ksess = session->kernel_session;
1899 struct ltt_ust_session *usess = session->ust_session;
1900 struct consumer_output *consumer = NULL;
1901
1902 assert(session);
1903 assert(uris);
1904 assert(nb_uri > 0);
1905
1906 /* Can't enable consumer after session started. */
1907 if (session->enabled) {
1908 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1909 goto error;
1910 }
1911
1912 /*
1913 * This case switch makes sure the domain session has a temporary consumer
1914 * so the URL can be set.
1915 */
1916 switch (domain) {
1917 case 0:
1918 /* Code flow error. A session MUST always have a consumer object */
1919 assert(session->consumer);
1920 /*
1921 * The URL will be added to the tracing session consumer instead of a
1922 * specific domain consumer.
1923 */
1924 consumer = session->consumer;
1925 break;
1926 case LTTNG_DOMAIN_KERNEL:
1927 /* Code flow error if we don't have a kernel session here. */
1928 assert(ksess);
1929 assert(ksess->consumer);
1930 consumer = ksess->consumer;
1931 break;
1932 case LTTNG_DOMAIN_UST:
1933 /* Code flow error if we don't have a kernel session here. */
1934 assert(usess);
1935 assert(usess->consumer);
1936 consumer = usess->consumer;
1937 break;
1938 }
1939
1940 for (i = 0; i < nb_uri; i++) {
1941 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1942 if (ret != LTTNG_OK) {
1943 goto error;
1944 }
1945 }
1946
1947 /* All good! */
1948 ret = LTTNG_OK;
1949
1950 error:
1951 return ret;
1952 }
1953
1954 /*
1955 * Command LTTNG_CREATE_SESSION processed by the client thread.
1956 */
1957 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1958 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
1959 {
1960 int ret;
1961 struct ltt_session *session;
1962
1963 assert(name);
1964 assert(creds);
1965
1966 /*
1967 * Verify if the session already exist
1968 *
1969 * XXX: There is no need for the session lock list here since the caller
1970 * (process_client_msg) is holding it. We might want to change that so a
1971 * single command does not lock the entire session list.
1972 */
1973 session = session_find_by_name(name);
1974 if (session != NULL) {
1975 ret = LTTNG_ERR_EXIST_SESS;
1976 goto find_error;
1977 }
1978
1979 /* Create tracing session in the registry */
1980 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1981 LTTNG_SOCK_GET_GID_CRED(creds));
1982 if (ret != LTTNG_OK) {
1983 goto session_error;
1984 }
1985
1986 /*
1987 * Get the newly created session pointer back
1988 *
1989 * XXX: There is no need for the session lock list here since the caller
1990 * (process_client_msg) is holding it. We might want to change that so a
1991 * single command does not lock the entire session list.
1992 */
1993 session = session_find_by_name(name);
1994 assert(session);
1995
1996 session->live_timer = live_timer;
1997 /* Create default consumer output for the session not yet created. */
1998 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1999 if (session->consumer == NULL) {
2000 ret = LTTNG_ERR_FATAL;
2001 goto consumer_error;
2002 }
2003
2004 if (uris) {
2005 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2006 if (ret != LTTNG_OK) {
2007 goto consumer_error;
2008 }
2009 session->output_traces = 1;
2010 } else {
2011 session->output_traces = 0;
2012 DBG2("Session %s created with no output", session->name);
2013 }
2014
2015 session->consumer->enabled = 1;
2016
2017 return LTTNG_OK;
2018
2019 consumer_error:
2020 session_destroy(session);
2021 session_error:
2022 find_error:
2023 return ret;
2024 }
2025
2026 /*
2027 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2028 */
2029 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2030 size_t nb_uri, lttng_sock_cred *creds)
2031 {
2032 int ret;
2033 struct ltt_session *session;
2034 struct snapshot_output *new_output = NULL;
2035
2036 assert(name);
2037 assert(creds);
2038
2039 /*
2040 * Create session in no output mode with URIs set to NULL. The uris we've
2041 * received are for a default snapshot output if one.
2042 */
2043 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2044 if (ret != LTTNG_OK) {
2045 goto error;
2046 }
2047
2048 /* Get the newly created session pointer back. This should NEVER fail. */
2049 session = session_find_by_name(name);
2050 assert(session);
2051
2052 /* Flag session for snapshot mode. */
2053 session->snapshot_mode = 1;
2054
2055 /* Skip snapshot output creation if no URI is given. */
2056 if (nb_uri == 0) {
2057 goto end;
2058 }
2059
2060 new_output = snapshot_output_alloc();
2061 if (!new_output) {
2062 ret = LTTNG_ERR_NOMEM;
2063 goto error_snapshot_alloc;
2064 }
2065
2066 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2067 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2068 if (ret < 0) {
2069 if (ret == -ENOMEM) {
2070 ret = LTTNG_ERR_NOMEM;
2071 } else {
2072 ret = LTTNG_ERR_INVALID;
2073 }
2074 goto error_snapshot;
2075 }
2076
2077 rcu_read_lock();
2078 snapshot_add_output(&session->snapshot, new_output);
2079 rcu_read_unlock();
2080
2081 end:
2082 return LTTNG_OK;
2083
2084 error_snapshot:
2085 snapshot_output_destroy(new_output);
2086 error_snapshot_alloc:
2087 session_destroy(session);
2088 error:
2089 return ret;
2090 }
2091
2092 /*
2093 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2094 */
2095 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2096 {
2097 int ret;
2098 struct ltt_ust_session *usess;
2099 struct ltt_kernel_session *ksess;
2100
2101 /* Safety net */
2102 assert(session);
2103
2104 usess = session->ust_session;
2105 ksess = session->kernel_session;
2106
2107 /* Clean kernel session teardown */
2108 kernel_destroy_session(ksess);
2109
2110 /* UST session teardown */
2111 if (usess) {
2112 /* Close any relayd session */
2113 consumer_output_send_destroy_relayd(usess->consumer);
2114
2115 /* Destroy every UST application related to this session. */
2116 ret = ust_app_destroy_trace_all(usess);
2117 if (ret) {
2118 ERR("Error in ust_app_destroy_trace_all");
2119 }
2120
2121 /* Clean up the rest. */
2122 trace_ust_destroy_session(usess);
2123 }
2124
2125 /*
2126 * Must notify the kernel thread here to update it's poll set in order to
2127 * remove the channel(s)' fd just destroyed.
2128 */
2129 ret = notify_thread_pipe(wpipe);
2130 if (ret < 0) {
2131 PERROR("write kernel poll pipe");
2132 }
2133
2134 ret = session_destroy(session);
2135
2136 return ret;
2137 }
2138
2139 /*
2140 * Command LTTNG_CALIBRATE processed by the client thread.
2141 */
2142 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2143 {
2144 int ret;
2145
2146 switch (domain) {
2147 case LTTNG_DOMAIN_KERNEL:
2148 {
2149 struct lttng_kernel_calibrate kcalibrate;
2150
2151 switch (calibrate->type) {
2152 case LTTNG_CALIBRATE_FUNCTION:
2153 default:
2154 /* Default and only possible calibrate option. */
2155 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2156 break;
2157 }
2158
2159 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2160 if (ret < 0) {
2161 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2162 goto error;
2163 }
2164 break;
2165 }
2166 case LTTNG_DOMAIN_UST:
2167 {
2168 struct lttng_ust_calibrate ucalibrate;
2169
2170 switch (calibrate->type) {
2171 case LTTNG_CALIBRATE_FUNCTION:
2172 default:
2173 /* Default and only possible calibrate option. */
2174 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2175 break;
2176 }
2177
2178 ret = ust_app_calibrate_glb(&ucalibrate);
2179 if (ret < 0) {
2180 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2181 goto error;
2182 }
2183 break;
2184 }
2185 default:
2186 ret = LTTNG_ERR_UND;
2187 goto error;
2188 }
2189
2190 ret = LTTNG_OK;
2191
2192 error:
2193 return ret;
2194 }
2195
2196 /*
2197 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2198 */
2199 int cmd_register_consumer(struct ltt_session *session, int domain,
2200 const char *sock_path, struct consumer_data *cdata)
2201 {
2202 int ret, sock;
2203 struct consumer_socket *socket = NULL;
2204
2205 assert(session);
2206 assert(cdata);
2207 assert(sock_path);
2208
2209 switch (domain) {
2210 case LTTNG_DOMAIN_KERNEL:
2211 {
2212 struct ltt_kernel_session *ksess = session->kernel_session;
2213
2214 assert(ksess);
2215
2216 /* Can't register a consumer if there is already one */
2217 if (ksess->consumer_fds_sent != 0) {
2218 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2219 goto error;
2220 }
2221
2222 sock = lttcomm_connect_unix_sock(sock_path);
2223 if (sock < 0) {
2224 ret = LTTNG_ERR_CONNECT_FAIL;
2225 goto error;
2226 }
2227 cdata->cmd_sock = sock;
2228
2229 socket = consumer_allocate_socket(&cdata->cmd_sock);
2230 if (socket == NULL) {
2231 ret = close(sock);
2232 if (ret < 0) {
2233 PERROR("close register consumer");
2234 }
2235 cdata->cmd_sock = -1;
2236 ret = LTTNG_ERR_FATAL;
2237 goto error;
2238 }
2239
2240 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2241 if (socket->lock == NULL) {
2242 PERROR("zmalloc pthread mutex");
2243 ret = LTTNG_ERR_FATAL;
2244 goto error;
2245 }
2246 pthread_mutex_init(socket->lock, NULL);
2247 socket->registered = 1;
2248
2249 rcu_read_lock();
2250 consumer_add_socket(socket, ksess->consumer);
2251 rcu_read_unlock();
2252
2253 pthread_mutex_lock(&cdata->pid_mutex);
2254 cdata->pid = -1;
2255 pthread_mutex_unlock(&cdata->pid_mutex);
2256
2257 break;
2258 }
2259 default:
2260 /* TODO: Userspace tracing */
2261 ret = LTTNG_ERR_UND;
2262 goto error;
2263 }
2264
2265 return LTTNG_OK;
2266
2267 error:
2268 if (socket) {
2269 consumer_destroy_socket(socket);
2270 }
2271 return ret;
2272 }
2273
2274 /*
2275 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2276 */
2277 ssize_t cmd_list_domains(struct ltt_session *session,
2278 struct lttng_domain **domains)
2279 {
2280 int ret, index = 0;
2281 ssize_t nb_dom = 0;
2282
2283 if (session->kernel_session != NULL) {
2284 DBG3("Listing domains found kernel domain");
2285 nb_dom++;
2286 }
2287
2288 if (session->ust_session != NULL) {
2289 DBG3("Listing domains found UST global domain");
2290 nb_dom++;
2291
2292 if (session->ust_session->domain_jul.being_used) {
2293 nb_dom++;
2294 }
2295 }
2296
2297 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2298 if (*domains == NULL) {
2299 ret = LTTNG_ERR_FATAL;
2300 goto error;
2301 }
2302
2303 if (session->kernel_session != NULL) {
2304 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2305 index++;
2306 }
2307
2308 if (session->ust_session != NULL) {
2309 (*domains)[index].type = LTTNG_DOMAIN_UST;
2310 (*domains)[index].buf_type = session->ust_session->buffer_type;
2311 index++;
2312
2313 if (session->ust_session->domain_jul.being_used) {
2314 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2315 (*domains)[index].buf_type = session->ust_session->buffer_type;
2316 index++;
2317 }
2318 }
2319
2320 return nb_dom;
2321
2322 error:
2323 /* Return negative value to differentiate return code */
2324 return -ret;
2325 }
2326
2327
2328 /*
2329 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2330 */
2331 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2332 struct lttng_channel **channels)
2333 {
2334 int ret;
2335 ssize_t nb_chan = 0;
2336
2337 switch (domain) {
2338 case LTTNG_DOMAIN_KERNEL:
2339 if (session->kernel_session != NULL) {
2340 nb_chan = session->kernel_session->channel_count;
2341 }
2342 DBG3("Number of kernel channels %zd", nb_chan);
2343 if (nb_chan <= 0) {
2344 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2345 }
2346 break;
2347 case LTTNG_DOMAIN_UST:
2348 if (session->ust_session != NULL) {
2349 nb_chan = lttng_ht_get_count(
2350 session->ust_session->domain_global.channels);
2351 }
2352 DBG3("Number of UST global channels %zd", nb_chan);
2353 if (nb_chan <= 0) {
2354 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2355 }
2356 break;
2357 default:
2358 *channels = NULL;
2359 ret = LTTNG_ERR_UND;
2360 goto error;
2361 }
2362
2363 if (nb_chan > 0) {
2364 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2365 if (*channels == NULL) {
2366 ret = LTTNG_ERR_FATAL;
2367 goto error;
2368 }
2369
2370 list_lttng_channels(domain, session, *channels);
2371 } else {
2372 *channels = NULL;
2373 /* Ret value was set in the domain switch case */
2374 goto error;
2375 }
2376
2377 return nb_chan;
2378
2379 error:
2380 /* Return negative value to differentiate return code */
2381 return -ret;
2382 }
2383
2384 /*
2385 * Command LTTNG_LIST_EVENTS processed by the client thread.
2386 */
2387 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2388 char *channel_name, struct lttng_event **events)
2389 {
2390 int ret = 0;
2391 ssize_t nb_event = 0;
2392
2393 switch (domain) {
2394 case LTTNG_DOMAIN_KERNEL:
2395 if (session->kernel_session != NULL) {
2396 nb_event = list_lttng_kernel_events(channel_name,
2397 session->kernel_session, events);
2398 }
2399 break;
2400 case LTTNG_DOMAIN_UST:
2401 {
2402 if (session->ust_session != NULL) {
2403 nb_event = list_lttng_ust_global_events(channel_name,
2404 &session->ust_session->domain_global, events);
2405 }
2406 break;
2407 }
2408 case LTTNG_DOMAIN_JUL:
2409 if (session->ust_session) {
2410 nb_event = list_lttng_jul_events(
2411 &session->ust_session->domain_jul, events);
2412 }
2413 break;
2414 default:
2415 ret = LTTNG_ERR_UND;
2416 goto error;
2417 }
2418
2419 return nb_event;
2420
2421 error:
2422 /* Return negative value to differentiate return code */
2423 return -ret;
2424 }
2425
2426 /*
2427 * Using the session list, filled a lttng_session array to send back to the
2428 * client for session listing.
2429 *
2430 * The session list lock MUST be acquired before calling this function. Use
2431 * session_lock_list() and session_unlock_list().
2432 */
2433 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2434 gid_t gid)
2435 {
2436 int ret;
2437 unsigned int i = 0;
2438 struct ltt_session *session;
2439 struct ltt_session_list *list = session_get_list();
2440
2441 DBG("Getting all available session for UID %d GID %d",
2442 uid, gid);
2443 /*
2444 * Iterate over session list and append data after the control struct in
2445 * the buffer.
2446 */
2447 cds_list_for_each_entry(session, &list->head, list) {
2448 /*
2449 * Only list the sessions the user can control.
2450 */
2451 if (!session_access_ok(session, uid, gid)) {
2452 continue;
2453 }
2454
2455 struct ltt_kernel_session *ksess = session->kernel_session;
2456 struct ltt_ust_session *usess = session->ust_session;
2457
2458 if (session->consumer->type == CONSUMER_DST_NET ||
2459 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2460 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2461 ret = build_network_session_path(sessions[i].path,
2462 sizeof(sessions[i].path), session);
2463 } else {
2464 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2465 session->consumer->dst.trace_path);
2466 }
2467 if (ret < 0) {
2468 PERROR("snprintf session path");
2469 continue;
2470 }
2471
2472 strncpy(sessions[i].name, session->name, NAME_MAX);
2473 sessions[i].name[NAME_MAX - 1] = '\0';
2474 sessions[i].enabled = session->enabled;
2475 sessions[i].snapshot_mode = session->snapshot_mode;
2476 i++;
2477 }
2478 }
2479
2480 /*
2481 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2482 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2483 */
2484 int cmd_data_pending(struct ltt_session *session)
2485 {
2486 int ret;
2487 struct ltt_kernel_session *ksess = session->kernel_session;
2488 struct ltt_ust_session *usess = session->ust_session;
2489
2490 assert(session);
2491
2492 /* Session MUST be stopped to ask for data availability. */
2493 if (session->enabled) {
2494 ret = LTTNG_ERR_SESSION_STARTED;
2495 goto error;
2496 }
2497
2498 if (ksess && ksess->consumer) {
2499 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2500 if (ret == 1) {
2501 /* Data is still being extracted for the kernel. */
2502 goto error;
2503 }
2504 }
2505
2506 if (usess && usess->consumer) {
2507 ret = consumer_is_data_pending(usess->id, usess->consumer);
2508 if (ret == 1) {
2509 /* Data is still being extracted for the kernel. */
2510 goto error;
2511 }
2512 }
2513
2514 /* Data is ready to be read by a viewer */
2515 ret = 0;
2516
2517 error:
2518 return ret;
2519 }
2520
2521 /*
2522 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2523 *
2524 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2525 */
2526 int cmd_snapshot_add_output(struct ltt_session *session,
2527 struct lttng_snapshot_output *output, uint32_t *id)
2528 {
2529 int ret;
2530 struct snapshot_output *new_output;
2531
2532 assert(session);
2533 assert(output);
2534
2535 DBG("Cmd snapshot add output for session %s", session->name);
2536
2537 /*
2538 * Permission denied to create an output if the session is not
2539 * set in no output mode.
2540 */
2541 if (session->output_traces) {
2542 ret = LTTNG_ERR_EPERM;
2543 goto error;
2544 }
2545
2546 /* Only one output is allowed until we have the "tee" feature. */
2547 if (session->snapshot.nb_output == 1) {
2548 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2549 goto error;
2550 }
2551
2552 new_output = snapshot_output_alloc();
2553 if (!new_output) {
2554 ret = LTTNG_ERR_NOMEM;
2555 goto error;
2556 }
2557
2558 ret = snapshot_output_init(output->max_size, output->name,
2559 output->ctrl_url, output->data_url, session->consumer, new_output,
2560 &session->snapshot);
2561 if (ret < 0) {
2562 if (ret == -ENOMEM) {
2563 ret = LTTNG_ERR_NOMEM;
2564 } else {
2565 ret = LTTNG_ERR_INVALID;
2566 }
2567 goto free_error;
2568 }
2569
2570 rcu_read_lock();
2571 snapshot_add_output(&session->snapshot, new_output);
2572 if (id) {
2573 *id = new_output->id;
2574 }
2575 rcu_read_unlock();
2576
2577 return LTTNG_OK;
2578
2579 free_error:
2580 snapshot_output_destroy(new_output);
2581 error:
2582 return ret;
2583 }
2584
2585 /*
2586 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2587 *
2588 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2589 */
2590 int cmd_snapshot_del_output(struct ltt_session *session,
2591 struct lttng_snapshot_output *output)
2592 {
2593 int ret;
2594 struct snapshot_output *sout = NULL;
2595
2596 assert(session);
2597 assert(output);
2598
2599 rcu_read_lock();
2600
2601 /*
2602 * Permission denied to create an output if the session is not
2603 * set in no output mode.
2604 */
2605 if (session->output_traces) {
2606 ret = LTTNG_ERR_EPERM;
2607 goto error;
2608 }
2609
2610 if (output->id) {
2611 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2612 session->name);
2613 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2614 } else if (*output->name != '\0') {
2615 DBG("Cmd snapshot del output name %s for session %s", output->name,
2616 session->name);
2617 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2618 }
2619 if (!sout) {
2620 ret = LTTNG_ERR_INVALID;
2621 goto error;
2622 }
2623
2624 snapshot_delete_output(&session->snapshot, sout);
2625 snapshot_output_destroy(sout);
2626 ret = LTTNG_OK;
2627
2628 error:
2629 rcu_read_unlock();
2630 return ret;
2631 }
2632
2633 /*
2634 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2635 *
2636 * If no output is available, outputs is untouched and 0 is returned.
2637 *
2638 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2639 */
2640 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2641 struct lttng_snapshot_output **outputs)
2642 {
2643 int ret, idx = 0;
2644 struct lttng_snapshot_output *list;
2645 struct lttng_ht_iter iter;
2646 struct snapshot_output *output;
2647
2648 assert(session);
2649 assert(outputs);
2650
2651 DBG("Cmd snapshot list outputs for session %s", session->name);
2652
2653 /*
2654 * Permission denied to create an output if the session is not
2655 * set in no output mode.
2656 */
2657 if (session->output_traces) {
2658 ret = LTTNG_ERR_EPERM;
2659 goto error;
2660 }
2661
2662 if (session->snapshot.nb_output == 0) {
2663 ret = 0;
2664 goto error;
2665 }
2666
2667 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2668 if (!list) {
2669 ret = LTTNG_ERR_NOMEM;
2670 goto error;
2671 }
2672
2673 /* Copy list from session to the new list object. */
2674 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2675 output, node.node) {
2676 assert(output->consumer);
2677 list[idx].id = output->id;
2678 list[idx].max_size = output->max_size;
2679 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2680 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2681 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2682 sizeof(list[idx].ctrl_url));
2683 } else {
2684 /* Control URI. */
2685 ret = uri_to_str_url(&output->consumer->dst.net.control,
2686 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2687 if (ret < 0) {
2688 ret = LTTNG_ERR_NOMEM;
2689 goto free_error;
2690 }
2691
2692 /* Data URI. */
2693 ret = uri_to_str_url(&output->consumer->dst.net.data,
2694 list[idx].data_url, sizeof(list[idx].data_url));
2695 if (ret < 0) {
2696 ret = LTTNG_ERR_NOMEM;
2697 goto free_error;
2698 }
2699 }
2700 idx++;
2701 }
2702
2703 *outputs = list;
2704 return session->snapshot.nb_output;
2705
2706 free_error:
2707 free(list);
2708 error:
2709 return -ret;
2710 }
2711
2712 /*
2713 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2714 * snapshot output is *not* set with a remote destination.
2715 *
2716 * Return 0 on success or a LTTNG_ERR code.
2717 */
2718 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2719 struct snapshot_output *snap_output, struct ltt_session *session)
2720 {
2721 int ret = LTTNG_OK;
2722 struct lttng_ht_iter iter;
2723 struct consumer_socket *socket;
2724
2725 assert(consumer);
2726 assert(snap_output);
2727 assert(session);
2728
2729 DBG2("Set relayd object from snapshot output");
2730
2731 /* Ignore if snapshot consumer output is not network. */
2732 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2733 goto error;
2734 }
2735
2736 /*
2737 * For each consumer socket, create and send the relayd object of the
2738 * snapshot output.
2739 */
2740 rcu_read_lock();
2741 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2742 socket, node.node) {
2743 ret = send_consumer_relayd_sockets(0, session->id,
2744 snap_output->consumer, socket,
2745 session->name, session->hostname,
2746 session->live_timer);
2747 if (ret != LTTNG_OK) {
2748 rcu_read_unlock();
2749 goto error;
2750 }
2751 }
2752 rcu_read_unlock();
2753
2754 error:
2755 return ret;
2756 }
2757
2758 /*
2759 * Record a kernel snapshot.
2760 *
2761 * Return LTTNG_OK on success or a LTTNG_ERR code.
2762 */
2763 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2764 struct snapshot_output *output, struct ltt_session *session,
2765 int wait, int nb_streams)
2766 {
2767 int ret;
2768
2769 assert(ksess);
2770 assert(output);
2771 assert(session);
2772
2773 /* Get the datetime for the snapshot output directory. */
2774 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2775 sizeof(output->datetime));
2776 if (!ret) {
2777 ret = LTTNG_ERR_INVALID;
2778 goto error;
2779 }
2780
2781 /*
2782 * Copy kernel session sockets so we can communicate with the right
2783 * consumer for the snapshot record command.
2784 */
2785 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2786 if (ret < 0) {
2787 ret = LTTNG_ERR_NOMEM;
2788 goto error;
2789 }
2790
2791 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2792 if (ret != LTTNG_OK) {
2793 goto error_snapshot;
2794 }
2795
2796 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2797 if (ret != LTTNG_OK) {
2798 goto error_snapshot;
2799 }
2800
2801 ret = LTTNG_OK;
2802
2803 error_snapshot:
2804 /* Clean up copied sockets so this output can use some other later on. */
2805 consumer_destroy_output_sockets(output->consumer);
2806 error:
2807 return ret;
2808 }
2809
2810 /*
2811 * Record a UST snapshot.
2812 *
2813 * Return 0 on success or a LTTNG_ERR error code.
2814 */
2815 static int record_ust_snapshot(struct ltt_ust_session *usess,
2816 struct snapshot_output *output, struct ltt_session *session,
2817 int wait, int nb_streams)
2818 {
2819 int ret;
2820
2821 assert(usess);
2822 assert(output);
2823 assert(session);
2824
2825 /* Get the datetime for the snapshot output directory. */
2826 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2827 sizeof(output->datetime));
2828 if (!ret) {
2829 ret = LTTNG_ERR_INVALID;
2830 goto error;
2831 }
2832
2833 /*
2834 * Copy UST session sockets so we can communicate with the right
2835 * consumer for the snapshot record command.
2836 */
2837 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2838 if (ret < 0) {
2839 ret = LTTNG_ERR_NOMEM;
2840 goto error;
2841 }
2842
2843 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2844 if (ret != LTTNG_OK) {
2845 goto error_snapshot;
2846 }
2847
2848 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2849 if (ret < 0) {
2850 switch (-ret) {
2851 case EINVAL:
2852 ret = LTTNG_ERR_INVALID;
2853 break;
2854 case ENODATA:
2855 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2856 break;
2857 default:
2858 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2859 break;
2860 }
2861 goto error_snapshot;
2862 }
2863
2864 ret = LTTNG_OK;
2865
2866 error_snapshot:
2867 /* Clean up copied sockets so this output can use some other later on. */
2868 consumer_destroy_output_sockets(output->consumer);
2869 error:
2870 return ret;
2871 }
2872
2873 /*
2874 * Returns the total number of streams for a session or a negative value
2875 * on error.
2876 */
2877 static unsigned int get_total_nb_stream(struct ltt_session *session)
2878 {
2879 unsigned int total_streams = 0;
2880
2881 if (session->kernel_session) {
2882 struct ltt_kernel_session *ksess = session->kernel_session;
2883
2884 total_streams += ksess->stream_count_global;
2885 }
2886
2887 if (session->ust_session) {
2888 struct ltt_ust_session *usess = session->ust_session;
2889
2890 total_streams += ust_app_get_nb_stream(usess);
2891 }
2892
2893 return total_streams;
2894 }
2895
2896 /*
2897 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2898 *
2899 * The wait parameter is ignored so this call always wait for the snapshot to
2900 * complete before returning.
2901 *
2902 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2903 */
2904 int cmd_snapshot_record(struct ltt_session *session,
2905 struct lttng_snapshot_output *output, int wait)
2906 {
2907 int ret = LTTNG_OK;
2908 unsigned int use_tmp_output = 0;
2909 struct snapshot_output tmp_output;
2910 unsigned int nb_streams, snapshot_success = 0;
2911
2912 assert(session);
2913
2914 DBG("Cmd snapshot record for session %s", session->name);
2915
2916 /*
2917 * Permission denied to create an output if the session is not
2918 * set in no output mode.
2919 */
2920 if (session->output_traces) {
2921 ret = LTTNG_ERR_EPERM;
2922 goto error;
2923 }
2924
2925 /* The session needs to be started at least once. */
2926 if (!session->started) {
2927 ret = LTTNG_ERR_START_SESSION_ONCE;
2928 goto error;
2929 }
2930
2931 /* Use temporary output for the session. */
2932 if (output && *output->ctrl_url != '\0') {
2933 ret = snapshot_output_init(output->max_size, output->name,
2934 output->ctrl_url, output->data_url, session->consumer,
2935 &tmp_output, NULL);
2936 if (ret < 0) {
2937 if (ret == -ENOMEM) {
2938 ret = LTTNG_ERR_NOMEM;
2939 } else {
2940 ret = LTTNG_ERR_INVALID;
2941 }
2942 goto error;
2943 }
2944 /* Use the global session count for the temporary snapshot. */
2945 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2946 use_tmp_output = 1;
2947 }
2948
2949 /*
2950 * Get the total number of stream of that session which is used by the
2951 * maximum size of the snapshot feature.
2952 */
2953 nb_streams = get_total_nb_stream(session);
2954
2955 if (session->kernel_session) {
2956 struct ltt_kernel_session *ksess = session->kernel_session;
2957
2958 if (use_tmp_output) {
2959 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2960 wait, nb_streams);
2961 if (ret != LTTNG_OK) {
2962 goto error;
2963 }
2964 snapshot_success = 1;
2965 } else {
2966 struct snapshot_output *sout;
2967 struct lttng_ht_iter iter;
2968
2969 rcu_read_lock();
2970 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2971 &iter.iter, sout, node.node) {
2972 /*
2973 * Make a local copy of the output and assign the possible
2974 * temporary value given by the caller.
2975 */
2976 memset(&tmp_output, 0, sizeof(tmp_output));
2977 memcpy(&tmp_output, sout, sizeof(tmp_output));
2978
2979 /* Use temporary max size. */
2980 if (output->max_size != (uint64_t) -1ULL) {
2981 tmp_output.max_size = output->max_size;
2982 }
2983
2984 /* Use temporary name. */
2985 if (*output->name != '\0') {
2986 strncpy(tmp_output.name, output->name,
2987 sizeof(tmp_output.name));
2988 }
2989
2990 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2991
2992 ret = record_kernel_snapshot(ksess, &tmp_output,
2993 session, wait, nb_streams);
2994 if (ret != LTTNG_OK) {
2995 rcu_read_unlock();
2996 goto error;
2997 }
2998 snapshot_success = 1;
2999 }
3000 rcu_read_unlock();
3001 }
3002 }
3003
3004 if (session->ust_session) {
3005 struct ltt_ust_session *usess = session->ust_session;
3006
3007 if (use_tmp_output) {
3008 ret = record_ust_snapshot(usess, &tmp_output, session,
3009 wait, nb_streams);
3010 if (ret != LTTNG_OK) {
3011 goto error;
3012 }
3013 snapshot_success = 1;
3014 } else {
3015 struct snapshot_output *sout;
3016 struct lttng_ht_iter iter;
3017
3018 rcu_read_lock();
3019 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3020 &iter.iter, sout, node.node) {
3021 /*
3022 * Make a local copy of the output and assign the possible
3023 * temporary value given by the caller.
3024 */
3025 memset(&tmp_output, 0, sizeof(tmp_output));
3026 memcpy(&tmp_output, sout, sizeof(tmp_output));
3027
3028 /* Use temporary max size. */
3029 if (output->max_size != (uint64_t) -1ULL) {
3030 tmp_output.max_size = output->max_size;
3031 }
3032
3033 /* Use temporary name. */
3034 if (*output->name != '\0') {
3035 strncpy(tmp_output.name, output->name,
3036 sizeof(tmp_output.name));
3037 }
3038
3039 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3040
3041 ret = record_ust_snapshot(usess, &tmp_output, session,
3042 wait, nb_streams);
3043 if (ret != LTTNG_OK) {
3044 rcu_read_unlock();
3045 goto error;
3046 }
3047 snapshot_success = 1;
3048 }
3049 rcu_read_unlock();
3050 }
3051 }
3052
3053 if (snapshot_success) {
3054 session->snapshot.nb_snapshot++;
3055 } else {
3056 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3057 }
3058
3059 error:
3060 return ret;
3061 }
3062
3063 /*
3064 * Init command subsystem.
3065 */
3066 void cmd_init(void)
3067 {
3068 /*
3069 * Set network sequence index to 1 for streams to match a relayd
3070 * socket on the consumer side.
3071 */
3072 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3073 relayd_net_seq_idx = 1;
3074 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3075
3076 DBG("Command subsystem initialized");
3077 }
LTTng 2.0 tools and control repository
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