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082e3456f707aab2b70d134e2708ef1837436ee6
[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 i++;
309 }
310
311 ret = nb_event;
312 *events = tmp;
313
314 error:
315 rcu_read_unlock();
316 return ret;
317 }
318
319 /*
320 * Fill lttng_event array of all kernel events in the channel.
321 */
322 static int list_lttng_kernel_events(char *channel_name,
323 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
324 {
325 int i = 0, ret;
326 unsigned int nb_event;
327 struct ltt_kernel_event *event;
328 struct ltt_kernel_channel *kchan;
329
330 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
331 if (kchan == NULL) {
332 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
333 goto error;
334 }
335
336 nb_event = kchan->event_count;
337
338 DBG("Listing events for channel %s", kchan->channel->name);
339
340 if (nb_event == 0) {
341 goto end;
342 }
343
344 *events = zmalloc(nb_event * sizeof(struct lttng_event));
345 if (*events == NULL) {
346 ret = LTTNG_ERR_FATAL;
347 goto error;
348 }
349
350 /* Kernel channels */
351 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
352 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
353 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
354 (*events)[i].enabled = event->enabled;
355
356 switch (event->event->instrumentation) {
357 case LTTNG_KERNEL_TRACEPOINT:
358 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
359 break;
360 case LTTNG_KERNEL_KRETPROBE:
361 (*events)[i].type = LTTNG_EVENT_FUNCTION;
362 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
363 sizeof(struct lttng_kernel_kprobe));
364 break;
365 case LTTNG_KERNEL_KPROBE:
366 (*events)[i].type = LTTNG_EVENT_PROBE;
367 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
368 sizeof(struct lttng_kernel_kprobe));
369 break;
370 case LTTNG_KERNEL_FUNCTION:
371 (*events)[i].type = LTTNG_EVENT_FUNCTION;
372 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
373 sizeof(struct lttng_kernel_function));
374 break;
375 case LTTNG_KERNEL_NOOP:
376 (*events)[i].type = LTTNG_EVENT_NOOP;
377 break;
378 case LTTNG_KERNEL_SYSCALL:
379 (*events)[i].type = LTTNG_EVENT_SYSCALL;
380 break;
381 case LTTNG_KERNEL_ALL:
382 assert(0);
383 break;
384 }
385 i++;
386 }
387
388 end:
389 return nb_event;
390
391 error:
392 /* Negate the error code to differentiate the size from an error */
393 return -ret;
394 }
395
396 /*
397 * Add URI so the consumer output object. Set the correct path depending on the
398 * domain adding the default trace directory.
399 */
400 static int add_uri_to_consumer(struct consumer_output *consumer,
401 struct lttng_uri *uri, int domain, const char *session_name)
402 {
403 int ret = LTTNG_OK;
404 const char *default_trace_dir;
405
406 assert(uri);
407
408 if (consumer == NULL) {
409 DBG("No consumer detected. Don't add URI. Stopping.");
410 ret = LTTNG_ERR_NO_CONSUMER;
411 goto error;
412 }
413
414 switch (domain) {
415 case LTTNG_DOMAIN_KERNEL:
416 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
417 break;
418 case LTTNG_DOMAIN_UST:
419 default_trace_dir = DEFAULT_UST_TRACE_DIR;
420 break;
421 default:
422 /*
423 * This case is possible is we try to add the URI to the global tracing
424 * session consumer object which in this case there is no subdir.
425 */
426 default_trace_dir = "";
427 }
428
429 switch (uri->dtype) {
430 case LTTNG_DST_IPV4:
431 case LTTNG_DST_IPV6:
432 DBG2("Setting network URI to consumer");
433
434 if (consumer->type == CONSUMER_DST_NET) {
435 if ((uri->stype == LTTNG_STREAM_CONTROL &&
436 consumer->dst.net.control_isset) ||
437 (uri->stype == LTTNG_STREAM_DATA &&
438 consumer->dst.net.data_isset)) {
439 ret = LTTNG_ERR_URL_EXIST;
440 goto error;
441 }
442 } else {
443 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
444 }
445
446 consumer->type = CONSUMER_DST_NET;
447
448 /* Set URI into consumer output object */
449 ret = consumer_set_network_uri(consumer, uri);
450 if (ret < 0) {
451 ret = -ret;
452 goto error;
453 } else if (ret == 1) {
454 /*
455 * URI was the same in the consumer so we do not append the subdir
456 * again so to not duplicate output dir.
457 */
458 goto error;
459 }
460
461 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
462 ret = consumer_set_subdir(consumer, session_name);
463 if (ret < 0) {
464 ret = LTTNG_ERR_FATAL;
465 goto error;
466 }
467 }
468
469 if (uri->stype == LTTNG_STREAM_CONTROL) {
470 /* On a new subdir, reappend the default trace dir. */
471 strncat(consumer->subdir, default_trace_dir,
472 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
473 DBG3("Append domain trace name to subdir %s", consumer->subdir);
474 }
475
476 break;
477 case LTTNG_DST_PATH:
478 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
479 memset(consumer->dst.trace_path, 0,
480 sizeof(consumer->dst.trace_path));
481 strncpy(consumer->dst.trace_path, uri->dst.path,
482 sizeof(consumer->dst.trace_path));
483 /* Append default trace dir */
484 strncat(consumer->dst.trace_path, default_trace_dir,
485 sizeof(consumer->dst.trace_path) -
486 strlen(consumer->dst.trace_path) - 1);
487 /* Flag consumer as local. */
488 consumer->type = CONSUMER_DST_LOCAL;
489 break;
490 }
491
492 ret = LTTNG_OK;
493
494 error:
495 return ret;
496 }
497
498 /*
499 * Init tracing by creating trace directory and sending fds kernel consumer.
500 */
501 static int init_kernel_tracing(struct ltt_kernel_session *session)
502 {
503 int ret = 0;
504 struct lttng_ht_iter iter;
505 struct consumer_socket *socket;
506
507 assert(session);
508
509 rcu_read_lock();
510
511 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
512 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
513 socket, node.node) {
514 pthread_mutex_lock(socket->lock);
515 ret = kernel_consumer_send_session(socket, session);
516 pthread_mutex_unlock(socket->lock);
517 if (ret < 0) {
518 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
519 goto error;
520 }
521 }
522 }
523
524 error:
525 rcu_read_unlock();
526 return ret;
527 }
528
529 /*
530 * Create a socket to the relayd using the URI.
531 *
532 * On success, the relayd_sock pointer is set to the created socket.
533 * Else, it's stays untouched and a lttcomm error code is returned.
534 */
535 static int create_connect_relayd(struct lttng_uri *uri,
536 struct lttcomm_relayd_sock **relayd_sock)
537 {
538 int ret;
539 struct lttcomm_relayd_sock *rsock;
540
541 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
542 RELAYD_VERSION_COMM_MINOR);
543 if (!rsock) {
544 ret = LTTNG_ERR_FATAL;
545 goto error;
546 }
547
548 /*
549 * Connect to relayd so we can proceed with a session creation. This call
550 * can possibly block for an arbitrary amount of time to set the health
551 * state to be in poll execution.
552 */
553 health_poll_entry();
554 ret = relayd_connect(rsock);
555 health_poll_exit();
556 if (ret < 0) {
557 ERR("Unable to reach lttng-relayd");
558 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
559 goto free_sock;
560 }
561
562 /* Create socket for control stream. */
563 if (uri->stype == LTTNG_STREAM_CONTROL) {
564 DBG3("Creating relayd stream socket from URI");
565
566 /* Check relayd version */
567 ret = relayd_version_check(rsock);
568 if (ret < 0) {
569 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
570 goto close_sock;
571 }
572 } else if (uri->stype == LTTNG_STREAM_DATA) {
573 DBG3("Creating relayd data socket from URI");
574 } else {
575 /* Command is not valid */
576 ERR("Relayd invalid stream type: %d", uri->stype);
577 ret = LTTNG_ERR_INVALID;
578 goto close_sock;
579 }
580
581 *relayd_sock = rsock;
582
583 return LTTNG_OK;
584
585 close_sock:
586 /* The returned value is not useful since we are on an error path. */
587 (void) relayd_close(rsock);
588 free_sock:
589 free(rsock);
590 error:
591 return ret;
592 }
593
594 /*
595 * Connect to the relayd using URI and send the socket to the right consumer.
596 */
597 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
598 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
599 struct consumer_socket *consumer_sock,
600 char *session_name, char *hostname, int session_live_timer)
601 {
602 int ret;
603 struct lttcomm_relayd_sock *rsock = NULL;
604
605 /* Connect to relayd and make version check if uri is the control. */
606 ret = create_connect_relayd(relayd_uri, &rsock);
607 if (ret != LTTNG_OK) {
608 goto error;
609 }
610 assert(rsock);
611
612 /* Set the network sequence index if not set. */
613 if (consumer->net_seq_index == (uint64_t) -1ULL) {
614 pthread_mutex_lock(&relayd_net_seq_idx_lock);
615 /*
616 * Increment net_seq_idx because we are about to transfer the
617 * new relayd socket to the consumer.
618 * Assign unique key so the consumer can match streams.
619 */
620 consumer->net_seq_index = ++relayd_net_seq_idx;
621 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
622 }
623
624 /* Send relayd socket to consumer. */
625 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
626 relayd_uri->stype, session_id,
627 session_name, hostname, session_live_timer);
628 if (ret < 0) {
629 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
630 goto close_sock;
631 }
632
633 /* Flag that the corresponding socket was sent. */
634 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
635 consumer_sock->control_sock_sent = 1;
636 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
637 consumer_sock->data_sock_sent = 1;
638 }
639
640 ret = LTTNG_OK;
641
642 /*
643 * Close socket which was dup on the consumer side. The session daemon does
644 * NOT keep track of the relayd socket(s) once transfer to the consumer.
645 */
646
647 close_sock:
648 (void) relayd_close(rsock);
649 free(rsock);
650
651 error:
652 if (ret != LTTNG_OK) {
653 /*
654 * The consumer output for this session should not be used anymore
655 * since the relayd connection failed thus making any tracing or/and
656 * streaming not usable.
657 */
658 consumer->enabled = 0;
659 }
660 return ret;
661 }
662
663 /*
664 * Send both relayd sockets to a specific consumer and domain. This is a
665 * helper function to facilitate sending the information to the consumer for a
666 * session.
667 */
668 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
669 struct consumer_output *consumer, struct consumer_socket *sock,
670 char *session_name, char *hostname, int session_live_timer)
671 {
672 int ret = LTTNG_OK;
673
674 assert(consumer);
675 assert(sock);
676
677 /* Sending control relayd socket. */
678 if (!sock->control_sock_sent) {
679 ret = send_consumer_relayd_socket(domain, session_id,
680 &consumer->dst.net.control, consumer, sock,
681 session_name, hostname, session_live_timer);
682 if (ret != LTTNG_OK) {
683 goto error;
684 }
685 }
686
687 /* Sending data relayd socket. */
688 if (!sock->data_sock_sent) {
689 ret = send_consumer_relayd_socket(domain, session_id,
690 &consumer->dst.net.data, consumer, sock,
691 session_name, hostname, session_live_timer);
692 if (ret != LTTNG_OK) {
693 goto error;
694 }
695 }
696
697 error:
698 return ret;
699 }
700
701 /*
702 * Setup relayd connections for a tracing session. First creates the socket to
703 * the relayd and send them to the right domain consumer. Consumer type MUST be
704 * network.
705 */
706 int cmd_setup_relayd(struct ltt_session *session)
707 {
708 int ret = LTTNG_OK;
709 struct ltt_ust_session *usess;
710 struct ltt_kernel_session *ksess;
711 struct consumer_socket *socket;
712 struct lttng_ht_iter iter;
713
714 assert(session);
715
716 usess = session->ust_session;
717 ksess = session->kernel_session;
718
719 DBG("Setting relayd for session %s", session->name);
720
721 rcu_read_lock();
722
723 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
724 && usess->consumer->enabled) {
725 /* For each consumer socket, send relayd sockets */
726 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
727 socket, node.node) {
728 pthread_mutex_lock(socket->lock);
729 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
730 usess->consumer, socket,
731 session->name, session->hostname,
732 session->live_timer);
733 pthread_mutex_unlock(socket->lock);
734 if (ret != LTTNG_OK) {
735 goto error;
736 }
737 /* Session is now ready for network streaming. */
738 session->net_handle = 1;
739 }
740 }
741
742 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
743 && ksess->consumer->enabled) {
744 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
745 socket, node.node) {
746 pthread_mutex_lock(socket->lock);
747 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
748 ksess->consumer, socket,
749 session->name, session->hostname,
750 session->live_timer);
751 pthread_mutex_unlock(socket->lock);
752 if (ret != LTTNG_OK) {
753 goto error;
754 }
755 /* Session is now ready for network streaming. */
756 session->net_handle = 1;
757 }
758 }
759
760 error:
761 rcu_read_unlock();
762 return ret;
763 }
764
765 /*
766 * Start a kernel session by opening all necessary streams.
767 */
768 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
769 {
770 int ret;
771 struct ltt_kernel_channel *kchan;
772
773 /* Open kernel metadata */
774 if (ksess->metadata == NULL && ksess->output_traces) {
775 ret = kernel_open_metadata(ksess);
776 if (ret < 0) {
777 ret = LTTNG_ERR_KERN_META_FAIL;
778 goto error;
779 }
780 }
781
782 /* Open kernel metadata stream */
783 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
784 ret = kernel_open_metadata_stream(ksess);
785 if (ret < 0) {
786 ERR("Kernel create metadata stream failed");
787 ret = LTTNG_ERR_KERN_STREAM_FAIL;
788 goto error;
789 }
790 }
791
792 /* For each channel */
793 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
794 if (kchan->stream_count == 0) {
795 ret = kernel_open_channel_stream(kchan);
796 if (ret < 0) {
797 ret = LTTNG_ERR_KERN_STREAM_FAIL;
798 goto error;
799 }
800 /* Update the stream global counter */
801 ksess->stream_count_global += ret;
802 }
803 }
804
805 /* Setup kernel consumer socket and send fds to it */
806 ret = init_kernel_tracing(ksess);
807 if (ret != 0) {
808 ret = LTTNG_ERR_KERN_START_FAIL;
809 goto error;
810 }
811
812 /* This start the kernel tracing */
813 ret = kernel_start_session(ksess);
814 if (ret < 0) {
815 ret = LTTNG_ERR_KERN_START_FAIL;
816 goto error;
817 }
818
819 /* Quiescent wait after starting trace */
820 kernel_wait_quiescent(kernel_tracer_fd);
821
822 ksess->started = 1;
823
824 ret = LTTNG_OK;
825
826 error:
827 return ret;
828 }
829
830 /*
831 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
832 */
833 int cmd_disable_channel(struct ltt_session *session, int domain,
834 char *channel_name)
835 {
836 int ret;
837 struct ltt_ust_session *usess;
838
839 usess = session->ust_session;
840
841 rcu_read_lock();
842
843 switch (domain) {
844 case LTTNG_DOMAIN_KERNEL:
845 {
846 ret = channel_kernel_disable(session->kernel_session,
847 channel_name);
848 if (ret != LTTNG_OK) {
849 goto error;
850 }
851
852 kernel_wait_quiescent(kernel_tracer_fd);
853 break;
854 }
855 case LTTNG_DOMAIN_UST:
856 {
857 struct ltt_ust_channel *uchan;
858 struct lttng_ht *chan_ht;
859
860 chan_ht = usess->domain_global.channels;
861
862 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
863 if (uchan == NULL) {
864 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
865 goto error;
866 }
867
868 ret = channel_ust_disable(usess, uchan);
869 if (ret != LTTNG_OK) {
870 goto error;
871 }
872 break;
873 }
874 #if 0
875 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
876 case LTTNG_DOMAIN_UST_EXEC_NAME:
877 case LTTNG_DOMAIN_UST_PID:
878 #endif
879 default:
880 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
881 goto error;
882 }
883
884 ret = LTTNG_OK;
885
886 error:
887 rcu_read_unlock();
888 return ret;
889 }
890
891 /*
892 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
893 *
894 * The wpipe arguments is used as a notifier for the kernel thread.
895 */
896 int cmd_enable_channel(struct ltt_session *session,
897 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
898 {
899 int ret;
900 struct ltt_ust_session *usess = session->ust_session;
901 struct lttng_ht *chan_ht;
902
903 assert(session);
904 assert(attr);
905 assert(domain);
906
907 DBG("Enabling channel %s for session %s", attr->name, session->name);
908
909 rcu_read_lock();
910
911 /*
912 * Don't try to enable a channel if the session has been started at
913 * some point in time before. The tracer does not allow it.
914 */
915 if (session->started) {
916 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
917 goto error;
918 }
919
920 /*
921 * If the session is a live session, remove the switch timer, the
922 * live timer does the same thing but sends also synchronisation
923 * beacons for inactive streams.
924 */
925 if (session->live_timer > 0) {
926 attr->attr.live_timer_interval = session->live_timer;
927 attr->attr.switch_timer_interval = 0;
928 }
929
930 switch (domain->type) {
931 case LTTNG_DOMAIN_KERNEL:
932 {
933 struct ltt_kernel_channel *kchan;
934
935 kchan = trace_kernel_get_channel_by_name(attr->name,
936 session->kernel_session);
937 if (kchan == NULL) {
938 /*
939 * Don't try to create a channel if the session
940 * has been started at some point in time
941 * before. The tracer does not allow it.
942 */
943 if (session->started) {
944 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
945 goto error;
946 }
947 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
948 if (attr->name[0] != '\0') {
949 session->kernel_session->has_non_default_channel = 1;
950 }
951 } else {
952 ret = channel_kernel_enable(session->kernel_session, kchan);
953 }
954
955 if (ret != LTTNG_OK) {
956 goto error;
957 }
958
959 kernel_wait_quiescent(kernel_tracer_fd);
960 break;
961 }
962 case LTTNG_DOMAIN_UST:
963 {
964 struct ltt_ust_channel *uchan;
965
966 chan_ht = usess->domain_global.channels;
967
968 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
969 if (uchan == NULL) {
970 /*
971 * Don't try to create a channel if the session
972 * has been started at some point in time
973 * before. The tracer does not allow it.
974 */
975 if (session->started) {
976 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
977 goto error;
978 }
979 ret = channel_ust_create(usess, attr, domain->buf_type);
980 if (attr->name[0] != '\0') {
981 usess->has_non_default_channel = 1;
982 }
983 } else {
984 ret = channel_ust_enable(usess, uchan);
985 }
986 break;
987 }
988 default:
989 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
990 goto error;
991 }
992
993 error:
994 rcu_read_unlock();
995 return ret;
996 }
997
998
999 /*
1000 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1001 */
1002 int cmd_disable_event(struct ltt_session *session, int domain,
1003 char *channel_name, char *event_name)
1004 {
1005 int ret;
1006
1007 rcu_read_lock();
1008
1009 switch (domain) {
1010 case LTTNG_DOMAIN_KERNEL:
1011 {
1012 struct ltt_kernel_channel *kchan;
1013 struct ltt_kernel_session *ksess;
1014
1015 ksess = session->kernel_session;
1016
1017 /*
1018 * If a non-default channel has been created in the
1019 * session, explicitely require that -c chan_name needs
1020 * to be provided.
1021 */
1022 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1023 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1024 goto error;
1025 }
1026
1027 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1028 if (kchan == NULL) {
1029 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1030 goto error;
1031 }
1032
1033 ret = event_kernel_disable_tracepoint(kchan, event_name);
1034 if (ret != LTTNG_OK) {
1035 goto error;
1036 }
1037
1038 kernel_wait_quiescent(kernel_tracer_fd);
1039 break;
1040 }
1041 case LTTNG_DOMAIN_UST:
1042 {
1043 struct ltt_ust_channel *uchan;
1044 struct ltt_ust_session *usess;
1045
1046 usess = session->ust_session;
1047
1048 /*
1049 * If a non-default channel has been created in the
1050 * session, explicitely require that -c chan_name needs
1051 * to be provided.
1052 */
1053 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1054 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1055 goto error;
1056 }
1057
1058 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1059 channel_name);
1060 if (uchan == NULL) {
1061 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1062 goto error;
1063 }
1064
1065 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1066 if (ret != LTTNG_OK) {
1067 goto error;
1068 }
1069
1070 DBG3("Disable UST event %s in channel %s completed", event_name,
1071 channel_name);
1072 break;
1073 }
1074 case LTTNG_DOMAIN_JUL:
1075 {
1076 struct ltt_ust_session *usess = session->ust_session;
1077
1078 assert(usess);
1079
1080 ret = event_jul_disable(usess, event_name);
1081 if (ret != LTTNG_OK) {
1082 goto error;
1083 }
1084
1085 break;
1086 }
1087 #if 0
1088 case LTTNG_DOMAIN_UST_EXEC_NAME:
1089 case LTTNG_DOMAIN_UST_PID:
1090 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1091 #endif
1092 default:
1093 ret = LTTNG_ERR_UND;
1094 goto error;
1095 }
1096
1097 ret = LTTNG_OK;
1098
1099 error:
1100 rcu_read_unlock();
1101 return ret;
1102 }
1103
1104 /*
1105 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1106 */
1107 int cmd_disable_event_all(struct ltt_session *session, int domain,
1108 char *channel_name)
1109 {
1110 int ret;
1111
1112 rcu_read_lock();
1113
1114 switch (domain) {
1115 case LTTNG_DOMAIN_KERNEL:
1116 {
1117 struct ltt_kernel_session *ksess;
1118 struct ltt_kernel_channel *kchan;
1119
1120 ksess = session->kernel_session;
1121
1122 /*
1123 * If a non-default channel has been created in the
1124 * session, explicitely require that -c chan_name needs
1125 * to be provided.
1126 */
1127 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1128 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1129 goto error;
1130 }
1131
1132 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1133 if (kchan == NULL) {
1134 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1135 goto error;
1136 }
1137
1138 ret = event_kernel_disable_all(kchan);
1139 if (ret != LTTNG_OK) {
1140 goto error;
1141 }
1142
1143 kernel_wait_quiescent(kernel_tracer_fd);
1144 break;
1145 }
1146 case LTTNG_DOMAIN_UST:
1147 {
1148 struct ltt_ust_session *usess;
1149 struct ltt_ust_channel *uchan;
1150
1151 usess = session->ust_session;
1152
1153 /*
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1156 * to be provided.
1157 */
1158 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1159 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1160 goto error;
1161 }
1162
1163 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1164 channel_name);
1165 if (uchan == NULL) {
1166 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1167 goto error;
1168 }
1169
1170 ret = event_ust_disable_all_tracepoints(usess, uchan);
1171 if (ret != 0) {
1172 goto error;
1173 }
1174
1175 DBG3("Disable all UST events in channel %s completed", channel_name);
1176
1177 break;
1178 }
1179 case LTTNG_DOMAIN_JUL:
1180 {
1181 struct ltt_ust_session *usess = session->ust_session;
1182
1183 assert(usess);
1184
1185 ret = event_jul_disable_all(usess);
1186 if (ret != LTTNG_OK) {
1187 goto error;
1188 }
1189
1190 break;
1191 }
1192 #if 0
1193 case LTTNG_DOMAIN_UST_EXEC_NAME:
1194 case LTTNG_DOMAIN_UST_PID:
1195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1196 #endif
1197 default:
1198 ret = LTTNG_ERR_UND;
1199 goto error;
1200 }
1201
1202 ret = LTTNG_OK;
1203
1204 error:
1205 rcu_read_unlock();
1206 return ret;
1207 }
1208
1209 /*
1210 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1211 */
1212 int cmd_add_context(struct ltt_session *session, int domain,
1213 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1214 {
1215 int ret, chan_kern_created = 0, chan_ust_created = 0;
1216
1217 switch (domain) {
1218 case LTTNG_DOMAIN_KERNEL:
1219 assert(session->kernel_session);
1220
1221 if (session->kernel_session->channel_count == 0) {
1222 /* Create default channel */
1223 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1224 if (ret != LTTNG_OK) {
1225 goto error;
1226 }
1227 chan_kern_created = 1;
1228 }
1229 /* Add kernel context to kernel tracer */
1230 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1231 if (ret != LTTNG_OK) {
1232 goto error;
1233 }
1234 break;
1235 case LTTNG_DOMAIN_UST:
1236 {
1237 struct ltt_ust_session *usess = session->ust_session;
1238 unsigned int chan_count;
1239
1240 assert(usess);
1241
1242 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1243 if (chan_count == 0) {
1244 struct lttng_channel *attr;
1245 /* Create default channel */
1246 attr = channel_new_default_attr(domain, usess->buffer_type);
1247 if (attr == NULL) {
1248 ret = LTTNG_ERR_FATAL;
1249 goto error;
1250 }
1251
1252 ret = channel_ust_create(usess, attr, usess->buffer_type);
1253 if (ret != LTTNG_OK) {
1254 free(attr);
1255 goto error;
1256 }
1257 free(attr);
1258 chan_ust_created = 1;
1259 }
1260
1261 ret = context_ust_add(usess, domain, ctx, channel_name);
1262 if (ret != LTTNG_OK) {
1263 goto error;
1264 }
1265 break;
1266 }
1267 #if 0
1268 case LTTNG_DOMAIN_UST_EXEC_NAME:
1269 case LTTNG_DOMAIN_UST_PID:
1270 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1271 #endif
1272 default:
1273 ret = LTTNG_ERR_UND;
1274 goto error;
1275 }
1276
1277 return LTTNG_OK;
1278
1279 error:
1280 if (chan_kern_created) {
1281 struct ltt_kernel_channel *kchan =
1282 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1283 session->kernel_session);
1284 /* Created previously, this should NOT fail. */
1285 assert(kchan);
1286 kernel_destroy_channel(kchan);
1287 }
1288
1289 if (chan_ust_created) {
1290 struct ltt_ust_channel *uchan =
1291 trace_ust_find_channel_by_name(
1292 session->ust_session->domain_global.channels,
1293 DEFAULT_CHANNEL_NAME);
1294 /* Created previously, this should NOT fail. */
1295 assert(uchan);
1296 /* Remove from the channel list of the session. */
1297 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1298 uchan);
1299 trace_ust_destroy_channel(uchan);
1300 }
1301 return ret;
1302 }
1303
1304 /*
1305 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1306 */
1307 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1308 char *channel_name, struct lttng_event *event,
1309 struct lttng_filter_bytecode *filter, int wpipe)
1310 {
1311 int ret, channel_created = 0;
1312 struct lttng_channel *attr;
1313
1314 assert(session);
1315 assert(event);
1316 assert(channel_name);
1317
1318 rcu_read_lock();
1319
1320 switch (domain->type) {
1321 case LTTNG_DOMAIN_KERNEL:
1322 {
1323 struct ltt_kernel_channel *kchan;
1324
1325 /*
1326 * If a non-default channel has been created in the
1327 * session, explicitely require that -c chan_name needs
1328 * to be provided.
1329 */
1330 if (session->kernel_session->has_non_default_channel
1331 && channel_name[0] == '\0') {
1332 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1333 goto error;
1334 }
1335
1336 kchan = trace_kernel_get_channel_by_name(channel_name,
1337 session->kernel_session);
1338 if (kchan == NULL) {
1339 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1340 LTTNG_BUFFER_GLOBAL);
1341 if (attr == NULL) {
1342 ret = LTTNG_ERR_FATAL;
1343 goto error;
1344 }
1345 strncpy(attr->name, channel_name, sizeof(attr->name));
1346
1347 ret = cmd_enable_channel(session, domain, attr, wpipe);
1348 if (ret != LTTNG_OK) {
1349 free(attr);
1350 goto error;
1351 }
1352 free(attr);
1353
1354 channel_created = 1;
1355 }
1356
1357 /* Get the newly created kernel channel pointer */
1358 kchan = trace_kernel_get_channel_by_name(channel_name,
1359 session->kernel_session);
1360 if (kchan == NULL) {
1361 /* This sould not happen... */
1362 ret = LTTNG_ERR_FATAL;
1363 goto error;
1364 }
1365
1366 ret = event_kernel_enable_tracepoint(kchan, event);
1367 if (ret != LTTNG_OK) {
1368 if (channel_created) {
1369 /* Let's not leak a useless channel. */
1370 kernel_destroy_channel(kchan);
1371 }
1372 goto error;
1373 }
1374
1375 kernel_wait_quiescent(kernel_tracer_fd);
1376 break;
1377 }
1378 case LTTNG_DOMAIN_UST:
1379 {
1380 struct ltt_ust_channel *uchan;
1381 struct ltt_ust_session *usess = session->ust_session;
1382
1383 assert(usess);
1384
1385 /*
1386 * If a non-default channel has been created in the
1387 * session, explicitely require that -c chan_name needs
1388 * to be provided.
1389 */
1390 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1391 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1392 goto error;
1393 }
1394
1395 /* Get channel from global UST domain */
1396 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1397 channel_name);
1398 if (uchan == NULL) {
1399 /* Create default channel */
1400 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1401 usess->buffer_type);
1402 if (attr == NULL) {
1403 ret = LTTNG_ERR_FATAL;
1404 goto error;
1405 }
1406 strncpy(attr->name, channel_name, sizeof(attr->name));
1407
1408 ret = cmd_enable_channel(session, domain, attr, wpipe);
1409 if (ret != LTTNG_OK) {
1410 free(attr);
1411 goto error;
1412 }
1413 free(attr);
1414
1415 /* Get the newly created channel reference back */
1416 uchan = trace_ust_find_channel_by_name(
1417 usess->domain_global.channels, channel_name);
1418 assert(uchan);
1419 }
1420
1421 /* At this point, the session and channel exist on the tracer */
1422 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1423 if (ret != LTTNG_OK) {
1424 goto error;
1425 }
1426 break;
1427 }
1428 case LTTNG_DOMAIN_JUL:
1429 {
1430 struct lttng_event uevent;
1431 struct lttng_domain tmp_dom;
1432 struct ltt_ust_session *usess = session->ust_session;
1433
1434 assert(usess);
1435
1436 /* Create the default JUL tracepoint. */
1437 uevent.type = LTTNG_EVENT_TRACEPOINT;
1438 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1439 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1440 uevent.name[sizeof(uevent.name) - 1] = '\0';
1441
1442 /*
1443 * The domain type is changed because we are about to enable the
1444 * default channel and event for the JUL domain that are hardcoded.
1445 * This happens in the UST domain.
1446 */
1447 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1448 tmp_dom.type = LTTNG_DOMAIN_UST;
1449
1450 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1451 &uevent, NULL, wpipe);
1452 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1453 goto error;
1454 }
1455
1456 /* The wild card * means that everything should be enabled. */
1457 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1458 ret = event_jul_enable_all(usess);
1459 } else {
1460 ret = event_jul_enable(usess, event);
1461 }
1462 if (ret != LTTNG_OK) {
1463 goto error;
1464 }
1465
1466 break;
1467 }
1468 #if 0
1469 case LTTNG_DOMAIN_UST_EXEC_NAME:
1470 case LTTNG_DOMAIN_UST_PID:
1471 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1472 #endif
1473 default:
1474 ret = LTTNG_ERR_UND;
1475 goto error;
1476 }
1477
1478 ret = LTTNG_OK;
1479
1480 error:
1481 rcu_read_unlock();
1482 return ret;
1483 }
1484
1485 /*
1486 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1487 */
1488 int cmd_enable_event_all(struct ltt_session *session,
1489 struct lttng_domain *domain, char *channel_name, int event_type,
1490 struct lttng_filter_bytecode *filter, int wpipe)
1491 {
1492 int ret;
1493 struct lttng_channel *attr;
1494
1495 assert(session);
1496 assert(channel_name);
1497
1498 rcu_read_lock();
1499
1500 switch (domain->type) {
1501 case LTTNG_DOMAIN_KERNEL:
1502 {
1503 struct ltt_kernel_channel *kchan;
1504
1505 assert(session->kernel_session);
1506
1507 /*
1508 * If a non-default channel has been created in the
1509 * session, explicitely require that -c chan_name needs
1510 * to be provided.
1511 */
1512 if (session->kernel_session->has_non_default_channel
1513 && channel_name[0] == '\0') {
1514 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1515 goto error;
1516 }
1517
1518 kchan = trace_kernel_get_channel_by_name(channel_name,
1519 session->kernel_session);
1520 if (kchan == NULL) {
1521 /* Create default channel */
1522 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1523 LTTNG_BUFFER_GLOBAL);
1524 if (attr == NULL) {
1525 ret = LTTNG_ERR_FATAL;
1526 goto error;
1527 }
1528 strncpy(attr->name, channel_name, sizeof(attr->name));
1529
1530 ret = cmd_enable_channel(session, domain, attr, wpipe);
1531 if (ret != LTTNG_OK) {
1532 free(attr);
1533 goto error;
1534 }
1535 free(attr);
1536
1537 /* Get the newly created kernel channel pointer */
1538 kchan = trace_kernel_get_channel_by_name(channel_name,
1539 session->kernel_session);
1540 assert(kchan);
1541 }
1542
1543 switch (event_type) {
1544 case LTTNG_EVENT_SYSCALL:
1545 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1546 break;
1547 case LTTNG_EVENT_TRACEPOINT:
1548 /*
1549 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1550 * events already registered to the channel.
1551 */
1552 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1553 break;
1554 case LTTNG_EVENT_ALL:
1555 /* Enable syscalls and tracepoints */
1556 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1557 break;
1558 default:
1559 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1560 goto error;
1561 }
1562
1563 /* Manage return value */
1564 if (ret != LTTNG_OK) {
1565 /*
1566 * On error, cmd_enable_channel call will take care of destroying
1567 * the created channel if it was needed.
1568 */
1569 goto error;
1570 }
1571
1572 kernel_wait_quiescent(kernel_tracer_fd);
1573 break;
1574 }
1575 case LTTNG_DOMAIN_UST:
1576 {
1577 struct ltt_ust_channel *uchan;
1578 struct ltt_ust_session *usess = session->ust_session;
1579
1580 assert(usess);
1581
1582 /*
1583 * If a non-default channel has been created in the
1584 * session, explicitely require that -c chan_name needs
1585 * to be provided.
1586 */
1587 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1588 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1589 goto error;
1590 }
1591
1592 /* Get channel from global UST domain */
1593 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1594 channel_name);
1595 if (uchan == NULL) {
1596 /* Create default channel */
1597 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1598 usess->buffer_type);
1599 if (attr == NULL) {
1600 ret = LTTNG_ERR_FATAL;
1601 goto error;
1602 }
1603 strncpy(attr->name, channel_name, sizeof(attr->name));
1604
1605 ret = cmd_enable_channel(session, domain, attr, wpipe);
1606 if (ret != LTTNG_OK) {
1607 free(attr);
1608 goto error;
1609 }
1610 free(attr);
1611
1612 /* Get the newly created channel reference back */
1613 uchan = trace_ust_find_channel_by_name(
1614 usess->domain_global.channels, channel_name);
1615 assert(uchan);
1616 }
1617
1618 /* At this point, the session and channel exist on the tracer */
1619
1620 switch (event_type) {
1621 case LTTNG_EVENT_ALL:
1622 case LTTNG_EVENT_TRACEPOINT:
1623 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1624 if (ret != LTTNG_OK) {
1625 goto error;
1626 }
1627 break;
1628 default:
1629 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1630 goto error;
1631 }
1632
1633 /* Manage return value */
1634 if (ret != LTTNG_OK) {
1635 goto error;
1636 }
1637
1638 break;
1639 }
1640 case LTTNG_DOMAIN_JUL:
1641 {
1642 struct lttng_event uevent;
1643 struct lttng_domain tmp_dom;
1644 struct ltt_ust_session *usess = session->ust_session;
1645
1646 assert(usess);
1647
1648 /* Create the default JUL tracepoint. */
1649 uevent.type = LTTNG_EVENT_TRACEPOINT;
1650 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1651 strncpy(uevent.name, DEFAULT_JUL_EVENT_NAME, sizeof(uevent.name));
1652 uevent.name[sizeof(uevent.name) - 1] = '\0';
1653
1654 /*
1655 * The domain type is changed because we are about to enable the
1656 * default channel and event for the JUL domain that are hardcoded.
1657 * This happens in the UST domain.
1658 */
1659 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1660 tmp_dom.type = LTTNG_DOMAIN_UST;
1661
1662 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1663 &uevent, NULL, wpipe);
1664 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1665 goto error;
1666 }
1667
1668 ret = event_jul_enable_all(usess);
1669 if (ret != LTTNG_OK) {
1670 goto error;
1671 }
1672
1673 break;
1674 }
1675 #if 0
1676 case LTTNG_DOMAIN_UST_EXEC_NAME:
1677 case LTTNG_DOMAIN_UST_PID:
1678 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1679 #endif
1680 default:
1681 ret = LTTNG_ERR_UND;
1682 goto error;
1683 }
1684
1685 ret = LTTNG_OK;
1686
1687 error:
1688 rcu_read_unlock();
1689 return ret;
1690 }
1691
1692
1693 /*
1694 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1695 */
1696 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1697 {
1698 int ret;
1699 ssize_t nb_events = 0;
1700
1701 switch (domain) {
1702 case LTTNG_DOMAIN_KERNEL:
1703 nb_events = kernel_list_events(kernel_tracer_fd, events);
1704 if (nb_events < 0) {
1705 ret = LTTNG_ERR_KERN_LIST_FAIL;
1706 goto error;
1707 }
1708 break;
1709 case LTTNG_DOMAIN_UST:
1710 nb_events = ust_app_list_events(events);
1711 if (nb_events < 0) {
1712 ret = LTTNG_ERR_UST_LIST_FAIL;
1713 goto error;
1714 }
1715 break;
1716 case LTTNG_DOMAIN_JUL:
1717 nb_events = jul_list_events(events);
1718 if (nb_events < 0) {
1719 ret = LTTNG_ERR_UST_LIST_FAIL;
1720 goto error;
1721 }
1722 break;
1723 default:
1724 ret = LTTNG_ERR_UND;
1725 goto error;
1726 }
1727
1728 return nb_events;
1729
1730 error:
1731 /* Return negative value to differentiate return code */
1732 return -ret;
1733 }
1734
1735 /*
1736 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1737 */
1738 ssize_t cmd_list_tracepoint_fields(int domain,
1739 struct lttng_event_field **fields)
1740 {
1741 int ret;
1742 ssize_t nb_fields = 0;
1743
1744 switch (domain) {
1745 case LTTNG_DOMAIN_UST:
1746 nb_fields = ust_app_list_event_fields(fields);
1747 if (nb_fields < 0) {
1748 ret = LTTNG_ERR_UST_LIST_FAIL;
1749 goto error;
1750 }
1751 break;
1752 case LTTNG_DOMAIN_KERNEL:
1753 default: /* fall-through */
1754 ret = LTTNG_ERR_UND;
1755 goto error;
1756 }
1757
1758 return nb_fields;
1759
1760 error:
1761 /* Return negative value to differentiate return code */
1762 return -ret;
1763 }
1764
1765 /*
1766 * Command LTTNG_START_TRACE processed by the client thread.
1767 */
1768 int cmd_start_trace(struct ltt_session *session)
1769 {
1770 int ret;
1771 struct ltt_kernel_session *ksession;
1772 struct ltt_ust_session *usess;
1773
1774 assert(session);
1775
1776 /* Ease our life a bit ;) */
1777 ksession = session->kernel_session;
1778 usess = session->ust_session;
1779
1780 if (session->enabled) {
1781 /* Already started. */
1782 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1783 goto error;
1784 }
1785
1786 session->enabled = 1;
1787
1788 /* Kernel tracing */
1789 if (ksession != NULL) {
1790 ret = start_kernel_session(ksession, kernel_tracer_fd);
1791 if (ret != LTTNG_OK) {
1792 goto error;
1793 }
1794 }
1795
1796 /* Flag session that trace should start automatically */
1797 if (usess) {
1798 usess->start_trace = 1;
1799
1800 ret = ust_app_start_trace_all(usess);
1801 if (ret < 0) {
1802 ret = LTTNG_ERR_UST_START_FAIL;
1803 goto error;
1804 }
1805 }
1806
1807 session->started = 1;
1808
1809 ret = LTTNG_OK;
1810
1811 error:
1812 return ret;
1813 }
1814
1815 /*
1816 * Command LTTNG_STOP_TRACE processed by the client thread.
1817 */
1818 int cmd_stop_trace(struct ltt_session *session)
1819 {
1820 int ret;
1821 struct ltt_kernel_channel *kchan;
1822 struct ltt_kernel_session *ksession;
1823 struct ltt_ust_session *usess;
1824
1825 assert(session);
1826
1827 /* Short cut */
1828 ksession = session->kernel_session;
1829 usess = session->ust_session;
1830
1831 if (!session->enabled) {
1832 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1833 goto error;
1834 }
1835
1836 session->enabled = 0;
1837
1838 /* Kernel tracer */
1839 if (ksession && ksession->started) {
1840 DBG("Stop kernel tracing");
1841
1842 /* Flush metadata if exist */
1843 if (ksession->metadata_stream_fd >= 0) {
1844 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1845 if (ret < 0) {
1846 ERR("Kernel metadata flush failed");
1847 }
1848 }
1849
1850 /* Flush all buffers before stopping */
1851 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1852 ret = kernel_flush_buffer(kchan);
1853 if (ret < 0) {
1854 ERR("Kernel flush buffer error");
1855 }
1856 }
1857
1858 ret = kernel_stop_session(ksession);
1859 if (ret < 0) {
1860 ret = LTTNG_ERR_KERN_STOP_FAIL;
1861 goto error;
1862 }
1863
1864 kernel_wait_quiescent(kernel_tracer_fd);
1865
1866 ksession->started = 0;
1867 }
1868
1869 if (usess && usess->start_trace) {
1870 usess->start_trace = 0;
1871
1872 ret = ust_app_stop_trace_all(usess);
1873 if (ret < 0) {
1874 ret = LTTNG_ERR_UST_STOP_FAIL;
1875 goto error;
1876 }
1877 }
1878
1879 ret = LTTNG_OK;
1880
1881 error:
1882 return ret;
1883 }
1884
1885 /*
1886 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1887 */
1888 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1889 size_t nb_uri, struct lttng_uri *uris)
1890 {
1891 int ret, i;
1892 struct ltt_kernel_session *ksess = session->kernel_session;
1893 struct ltt_ust_session *usess = session->ust_session;
1894 struct consumer_output *consumer = NULL;
1895
1896 assert(session);
1897 assert(uris);
1898 assert(nb_uri > 0);
1899
1900 /* Can't enable consumer after session started. */
1901 if (session->enabled) {
1902 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1903 goto error;
1904 }
1905
1906 /*
1907 * This case switch makes sure the domain session has a temporary consumer
1908 * so the URL can be set.
1909 */
1910 switch (domain) {
1911 case 0:
1912 /* Code flow error. A session MUST always have a consumer object */
1913 assert(session->consumer);
1914 /*
1915 * The URL will be added to the tracing session consumer instead of a
1916 * specific domain consumer.
1917 */
1918 consumer = session->consumer;
1919 break;
1920 case LTTNG_DOMAIN_KERNEL:
1921 /* Code flow error if we don't have a kernel session here. */
1922 assert(ksess);
1923 assert(ksess->consumer);
1924 consumer = ksess->consumer;
1925 break;
1926 case LTTNG_DOMAIN_UST:
1927 /* Code flow error if we don't have a kernel session here. */
1928 assert(usess);
1929 assert(usess->consumer);
1930 consumer = usess->consumer;
1931 break;
1932 }
1933
1934 for (i = 0; i < nb_uri; i++) {
1935 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1936 if (ret != LTTNG_OK) {
1937 goto error;
1938 }
1939 }
1940
1941 /* All good! */
1942 ret = LTTNG_OK;
1943
1944 error:
1945 return ret;
1946 }
1947
1948 /*
1949 * Command LTTNG_CREATE_SESSION processed by the client thread.
1950 */
1951 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1952 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
1953 {
1954 int ret;
1955 struct ltt_session *session;
1956
1957 assert(name);
1958 assert(creds);
1959
1960 /*
1961 * Verify if the session already exist
1962 *
1963 * XXX: There is no need for the session lock list here since the caller
1964 * (process_client_msg) is holding it. We might want to change that so a
1965 * single command does not lock the entire session list.
1966 */
1967 session = session_find_by_name(name);
1968 if (session != NULL) {
1969 ret = LTTNG_ERR_EXIST_SESS;
1970 goto find_error;
1971 }
1972
1973 /* Create tracing session in the registry */
1974 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1975 LTTNG_SOCK_GET_GID_CRED(creds));
1976 if (ret != LTTNG_OK) {
1977 goto session_error;
1978 }
1979
1980 /*
1981 * Get the newly created session pointer back
1982 *
1983 * XXX: There is no need for the session lock list here since the caller
1984 * (process_client_msg) is holding it. We might want to change that so a
1985 * single command does not lock the entire session list.
1986 */
1987 session = session_find_by_name(name);
1988 assert(session);
1989
1990 session->live_timer = live_timer;
1991 /* Create default consumer output for the session not yet created. */
1992 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1993 if (session->consumer == NULL) {
1994 ret = LTTNG_ERR_FATAL;
1995 goto consumer_error;
1996 }
1997
1998 if (uris) {
1999 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2000 if (ret != LTTNG_OK) {
2001 goto consumer_error;
2002 }
2003 session->output_traces = 1;
2004 } else {
2005 session->output_traces = 0;
2006 DBG2("Session %s created with no output", session->name);
2007 }
2008
2009 session->consumer->enabled = 1;
2010
2011 return LTTNG_OK;
2012
2013 consumer_error:
2014 session_destroy(session);
2015 session_error:
2016 find_error:
2017 return ret;
2018 }
2019
2020 /*
2021 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2022 */
2023 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2024 size_t nb_uri, lttng_sock_cred *creds)
2025 {
2026 int ret;
2027 struct ltt_session *session;
2028 struct snapshot_output *new_output = NULL;
2029
2030 assert(name);
2031 assert(creds);
2032
2033 /*
2034 * Create session in no output mode with URIs set to NULL. The uris we've
2035 * received are for a default snapshot output if one.
2036 */
2037 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2038 if (ret != LTTNG_OK) {
2039 goto error;
2040 }
2041
2042 /* Get the newly created session pointer back. This should NEVER fail. */
2043 session = session_find_by_name(name);
2044 assert(session);
2045
2046 /* Flag session for snapshot mode. */
2047 session->snapshot_mode = 1;
2048
2049 /* Skip snapshot output creation if no URI is given. */
2050 if (nb_uri == 0) {
2051 goto end;
2052 }
2053
2054 new_output = snapshot_output_alloc();
2055 if (!new_output) {
2056 ret = LTTNG_ERR_NOMEM;
2057 goto error_snapshot_alloc;
2058 }
2059
2060 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2061 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2062 if (ret < 0) {
2063 if (ret == -ENOMEM) {
2064 ret = LTTNG_ERR_NOMEM;
2065 } else {
2066 ret = LTTNG_ERR_INVALID;
2067 }
2068 goto error_snapshot;
2069 }
2070
2071 rcu_read_lock();
2072 snapshot_add_output(&session->snapshot, new_output);
2073 rcu_read_unlock();
2074
2075 end:
2076 return LTTNG_OK;
2077
2078 error_snapshot:
2079 snapshot_output_destroy(new_output);
2080 error_snapshot_alloc:
2081 session_destroy(session);
2082 error:
2083 return ret;
2084 }
2085
2086 /*
2087 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2088 */
2089 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2090 {
2091 int ret;
2092 struct ltt_ust_session *usess;
2093 struct ltt_kernel_session *ksess;
2094
2095 /* Safety net */
2096 assert(session);
2097
2098 usess = session->ust_session;
2099 ksess = session->kernel_session;
2100
2101 /* Clean kernel session teardown */
2102 kernel_destroy_session(ksess);
2103
2104 /* UST session teardown */
2105 if (usess) {
2106 /* Close any relayd session */
2107 consumer_output_send_destroy_relayd(usess->consumer);
2108
2109 /* Destroy every UST application related to this session. */
2110 ret = ust_app_destroy_trace_all(usess);
2111 if (ret) {
2112 ERR("Error in ust_app_destroy_trace_all");
2113 }
2114
2115 /* Clean up the rest. */
2116 trace_ust_destroy_session(usess);
2117 }
2118
2119 /*
2120 * Must notify the kernel thread here to update it's poll set in order to
2121 * remove the channel(s)' fd just destroyed.
2122 */
2123 ret = notify_thread_pipe(wpipe);
2124 if (ret < 0) {
2125 PERROR("write kernel poll pipe");
2126 }
2127
2128 ret = session_destroy(session);
2129
2130 return ret;
2131 }
2132
2133 /*
2134 * Command LTTNG_CALIBRATE processed by the client thread.
2135 */
2136 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2137 {
2138 int ret;
2139
2140 switch (domain) {
2141 case LTTNG_DOMAIN_KERNEL:
2142 {
2143 struct lttng_kernel_calibrate kcalibrate;
2144
2145 kcalibrate.type = calibrate->type;
2146 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2147 if (ret < 0) {
2148 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2149 goto error;
2150 }
2151 break;
2152 }
2153 case LTTNG_DOMAIN_UST:
2154 {
2155 struct lttng_ust_calibrate ucalibrate;
2156
2157 ucalibrate.type = calibrate->type;
2158 ret = ust_app_calibrate_glb(&ucalibrate);
2159 if (ret < 0) {
2160 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2161 goto error;
2162 }
2163 break;
2164 }
2165 default:
2166 ret = LTTNG_ERR_UND;
2167 goto error;
2168 }
2169
2170 ret = LTTNG_OK;
2171
2172 error:
2173 return ret;
2174 }
2175
2176 /*
2177 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2178 */
2179 int cmd_register_consumer(struct ltt_session *session, int domain,
2180 const char *sock_path, struct consumer_data *cdata)
2181 {
2182 int ret, sock;
2183 struct consumer_socket *socket = NULL;
2184
2185 assert(session);
2186 assert(cdata);
2187 assert(sock_path);
2188
2189 switch (domain) {
2190 case LTTNG_DOMAIN_KERNEL:
2191 {
2192 struct ltt_kernel_session *ksess = session->kernel_session;
2193
2194 assert(ksess);
2195
2196 /* Can't register a consumer if there is already one */
2197 if (ksess->consumer_fds_sent != 0) {
2198 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2199 goto error;
2200 }
2201
2202 sock = lttcomm_connect_unix_sock(sock_path);
2203 if (sock < 0) {
2204 ret = LTTNG_ERR_CONNECT_FAIL;
2205 goto error;
2206 }
2207 cdata->cmd_sock = sock;
2208
2209 socket = consumer_allocate_socket(&cdata->cmd_sock);
2210 if (socket == NULL) {
2211 ret = close(sock);
2212 if (ret < 0) {
2213 PERROR("close register consumer");
2214 }
2215 cdata->cmd_sock = -1;
2216 ret = LTTNG_ERR_FATAL;
2217 goto error;
2218 }
2219
2220 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2221 if (socket->lock == NULL) {
2222 PERROR("zmalloc pthread mutex");
2223 ret = LTTNG_ERR_FATAL;
2224 goto error;
2225 }
2226 pthread_mutex_init(socket->lock, NULL);
2227 socket->registered = 1;
2228
2229 rcu_read_lock();
2230 consumer_add_socket(socket, ksess->consumer);
2231 rcu_read_unlock();
2232
2233 pthread_mutex_lock(&cdata->pid_mutex);
2234 cdata->pid = -1;
2235 pthread_mutex_unlock(&cdata->pid_mutex);
2236
2237 break;
2238 }
2239 default:
2240 /* TODO: Userspace tracing */
2241 ret = LTTNG_ERR_UND;
2242 goto error;
2243 }
2244
2245 return LTTNG_OK;
2246
2247 error:
2248 if (socket) {
2249 consumer_destroy_socket(socket);
2250 }
2251 return ret;
2252 }
2253
2254 /*
2255 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2256 */
2257 ssize_t cmd_list_domains(struct ltt_session *session,
2258 struct lttng_domain **domains)
2259 {
2260 int ret, index = 0;
2261 ssize_t nb_dom = 0;
2262
2263 if (session->kernel_session != NULL) {
2264 DBG3("Listing domains found kernel domain");
2265 nb_dom++;
2266 }
2267
2268 if (session->ust_session != NULL) {
2269 DBG3("Listing domains found UST global domain");
2270 nb_dom++;
2271
2272 if (session->ust_session->domain_jul.being_used) {
2273 nb_dom++;
2274 }
2275 }
2276
2277 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2278 if (*domains == NULL) {
2279 ret = LTTNG_ERR_FATAL;
2280 goto error;
2281 }
2282
2283 if (session->kernel_session != NULL) {
2284 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2285 index++;
2286 }
2287
2288 if (session->ust_session != NULL) {
2289 (*domains)[index].type = LTTNG_DOMAIN_UST;
2290 (*domains)[index].buf_type = session->ust_session->buffer_type;
2291 index++;
2292
2293 if (session->ust_session->domain_jul.being_used) {
2294 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2295 (*domains)[index].buf_type = session->ust_session->buffer_type;
2296 index++;
2297 }
2298 }
2299
2300 return nb_dom;
2301
2302 error:
2303 /* Return negative value to differentiate return code */
2304 return -ret;
2305 }
2306
2307
2308 /*
2309 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2310 */
2311 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2312 struct lttng_channel **channels)
2313 {
2314 int ret;
2315 ssize_t nb_chan = 0;
2316
2317 switch (domain) {
2318 case LTTNG_DOMAIN_KERNEL:
2319 if (session->kernel_session != NULL) {
2320 nb_chan = session->kernel_session->channel_count;
2321 }
2322 DBG3("Number of kernel channels %zd", nb_chan);
2323 if (nb_chan <= 0) {
2324 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2325 }
2326 break;
2327 case LTTNG_DOMAIN_UST:
2328 if (session->ust_session != NULL) {
2329 nb_chan = lttng_ht_get_count(
2330 session->ust_session->domain_global.channels);
2331 }
2332 DBG3("Number of UST global channels %zd", nb_chan);
2333 if (nb_chan <= 0) {
2334 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2335 }
2336 break;
2337 default:
2338 *channels = NULL;
2339 ret = LTTNG_ERR_UND;
2340 goto error;
2341 }
2342
2343 if (nb_chan > 0) {
2344 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2345 if (*channels == NULL) {
2346 ret = LTTNG_ERR_FATAL;
2347 goto error;
2348 }
2349
2350 list_lttng_channels(domain, session, *channels);
2351 } else {
2352 *channels = NULL;
2353 /* Ret value was set in the domain switch case */
2354 goto error;
2355 }
2356
2357 return nb_chan;
2358
2359 error:
2360 /* Return negative value to differentiate return code */
2361 return -ret;
2362 }
2363
2364 /*
2365 * Command LTTNG_LIST_EVENTS processed by the client thread.
2366 */
2367 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2368 char *channel_name, struct lttng_event **events)
2369 {
2370 int ret = 0;
2371 ssize_t nb_event = 0;
2372
2373 switch (domain) {
2374 case LTTNG_DOMAIN_KERNEL:
2375 if (session->kernel_session != NULL) {
2376 nb_event = list_lttng_kernel_events(channel_name,
2377 session->kernel_session, events);
2378 }
2379 break;
2380 case LTTNG_DOMAIN_UST:
2381 {
2382 if (session->ust_session != NULL) {
2383 nb_event = list_lttng_ust_global_events(channel_name,
2384 &session->ust_session->domain_global, events);
2385 }
2386 break;
2387 }
2388 case LTTNG_DOMAIN_JUL:
2389 if (session->ust_session) {
2390 nb_event = list_lttng_jul_events(
2391 &session->ust_session->domain_jul, events);
2392 }
2393 break;
2394 default:
2395 ret = LTTNG_ERR_UND;
2396 goto error;
2397 }
2398
2399 return nb_event;
2400
2401 error:
2402 /* Return negative value to differentiate return code */
2403 return -ret;
2404 }
2405
2406 /*
2407 * Using the session list, filled a lttng_session array to send back to the
2408 * client for session listing.
2409 *
2410 * The session list lock MUST be acquired before calling this function. Use
2411 * session_lock_list() and session_unlock_list().
2412 */
2413 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2414 gid_t gid)
2415 {
2416 int ret;
2417 unsigned int i = 0;
2418 struct ltt_session *session;
2419 struct ltt_session_list *list = session_get_list();
2420
2421 DBG("Getting all available session for UID %d GID %d",
2422 uid, gid);
2423 /*
2424 * Iterate over session list and append data after the control struct in
2425 * the buffer.
2426 */
2427 cds_list_for_each_entry(session, &list->head, list) {
2428 /*
2429 * Only list the sessions the user can control.
2430 */
2431 if (!session_access_ok(session, uid, gid)) {
2432 continue;
2433 }
2434
2435 struct ltt_kernel_session *ksess = session->kernel_session;
2436 struct ltt_ust_session *usess = session->ust_session;
2437
2438 if (session->consumer->type == CONSUMER_DST_NET ||
2439 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2440 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2441 ret = build_network_session_path(sessions[i].path,
2442 sizeof(sessions[i].path), session);
2443 } else {
2444 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2445 session->consumer->dst.trace_path);
2446 }
2447 if (ret < 0) {
2448 PERROR("snprintf session path");
2449 continue;
2450 }
2451
2452 strncpy(sessions[i].name, session->name, NAME_MAX);
2453 sessions[i].name[NAME_MAX - 1] = '\0';
2454 sessions[i].enabled = session->enabled;
2455 sessions[i].snapshot_mode = session->snapshot_mode;
2456 i++;
2457 }
2458 }
2459
2460 /*
2461 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2462 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2463 */
2464 int cmd_data_pending(struct ltt_session *session)
2465 {
2466 int ret;
2467 struct ltt_kernel_session *ksess = session->kernel_session;
2468 struct ltt_ust_session *usess = session->ust_session;
2469
2470 assert(session);
2471
2472 /* Session MUST be stopped to ask for data availability. */
2473 if (session->enabled) {
2474 ret = LTTNG_ERR_SESSION_STARTED;
2475 goto error;
2476 }
2477
2478 if (ksess && ksess->consumer) {
2479 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2480 if (ret == 1) {
2481 /* Data is still being extracted for the kernel. */
2482 goto error;
2483 }
2484 }
2485
2486 if (usess && usess->consumer) {
2487 ret = consumer_is_data_pending(usess->id, usess->consumer);
2488 if (ret == 1) {
2489 /* Data is still being extracted for the kernel. */
2490 goto error;
2491 }
2492 }
2493
2494 /* Data is ready to be read by a viewer */
2495 ret = 0;
2496
2497 error:
2498 return ret;
2499 }
2500
2501 /*
2502 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2503 *
2504 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2505 */
2506 int cmd_snapshot_add_output(struct ltt_session *session,
2507 struct lttng_snapshot_output *output, uint32_t *id)
2508 {
2509 int ret;
2510 struct snapshot_output *new_output;
2511
2512 assert(session);
2513 assert(output);
2514
2515 DBG("Cmd snapshot add output for session %s", session->name);
2516
2517 /*
2518 * Permission denied to create an output if the session is not
2519 * set in no output mode.
2520 */
2521 if (session->output_traces) {
2522 ret = LTTNG_ERR_EPERM;
2523 goto error;
2524 }
2525
2526 /* Only one output is allowed until we have the "tee" feature. */
2527 if (session->snapshot.nb_output == 1) {
2528 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2529 goto error;
2530 }
2531
2532 new_output = snapshot_output_alloc();
2533 if (!new_output) {
2534 ret = LTTNG_ERR_NOMEM;
2535 goto error;
2536 }
2537
2538 ret = snapshot_output_init(output->max_size, output->name,
2539 output->ctrl_url, output->data_url, session->consumer, new_output,
2540 &session->snapshot);
2541 if (ret < 0) {
2542 if (ret == -ENOMEM) {
2543 ret = LTTNG_ERR_NOMEM;
2544 } else {
2545 ret = LTTNG_ERR_INVALID;
2546 }
2547 goto free_error;
2548 }
2549
2550 rcu_read_lock();
2551 snapshot_add_output(&session->snapshot, new_output);
2552 if (id) {
2553 *id = new_output->id;
2554 }
2555 rcu_read_unlock();
2556
2557 return LTTNG_OK;
2558
2559 free_error:
2560 snapshot_output_destroy(new_output);
2561 error:
2562 return ret;
2563 }
2564
2565 /*
2566 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2567 *
2568 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2569 */
2570 int cmd_snapshot_del_output(struct ltt_session *session,
2571 struct lttng_snapshot_output *output)
2572 {
2573 int ret;
2574 struct snapshot_output *sout = NULL;
2575
2576 assert(session);
2577 assert(output);
2578
2579 rcu_read_lock();
2580
2581 /*
2582 * Permission denied to create an output if the session is not
2583 * set in no output mode.
2584 */
2585 if (session->output_traces) {
2586 ret = LTTNG_ERR_EPERM;
2587 goto error;
2588 }
2589
2590 if (output->id) {
2591 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2592 session->name);
2593 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2594 } else if (*output->name != '\0') {
2595 DBG("Cmd snapshot del output name %s for session %s", output->name,
2596 session->name);
2597 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2598 }
2599 if (!sout) {
2600 ret = LTTNG_ERR_INVALID;
2601 goto error;
2602 }
2603
2604 snapshot_delete_output(&session->snapshot, sout);
2605 snapshot_output_destroy(sout);
2606 ret = LTTNG_OK;
2607
2608 error:
2609 rcu_read_unlock();
2610 return ret;
2611 }
2612
2613 /*
2614 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2615 *
2616 * If no output is available, outputs is untouched and 0 is returned.
2617 *
2618 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2619 */
2620 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2621 struct lttng_snapshot_output **outputs)
2622 {
2623 int ret, idx = 0;
2624 struct lttng_snapshot_output *list;
2625 struct lttng_ht_iter iter;
2626 struct snapshot_output *output;
2627
2628 assert(session);
2629 assert(outputs);
2630
2631 DBG("Cmd snapshot list outputs for session %s", session->name);
2632
2633 /*
2634 * Permission denied to create an output if the session is not
2635 * set in no output mode.
2636 */
2637 if (session->output_traces) {
2638 ret = LTTNG_ERR_EPERM;
2639 goto error;
2640 }
2641
2642 if (session->snapshot.nb_output == 0) {
2643 ret = 0;
2644 goto error;
2645 }
2646
2647 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2648 if (!list) {
2649 ret = LTTNG_ERR_NOMEM;
2650 goto error;
2651 }
2652
2653 /* Copy list from session to the new list object. */
2654 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2655 output, node.node) {
2656 assert(output->consumer);
2657 list[idx].id = output->id;
2658 list[idx].max_size = output->max_size;
2659 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2660 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2661 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2662 sizeof(list[idx].ctrl_url));
2663 } else {
2664 /* Control URI. */
2665 ret = uri_to_str_url(&output->consumer->dst.net.control,
2666 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2667 if (ret < 0) {
2668 ret = LTTNG_ERR_NOMEM;
2669 goto free_error;
2670 }
2671
2672 /* Data URI. */
2673 ret = uri_to_str_url(&output->consumer->dst.net.data,
2674 list[idx].data_url, sizeof(list[idx].data_url));
2675 if (ret < 0) {
2676 ret = LTTNG_ERR_NOMEM;
2677 goto free_error;
2678 }
2679 }
2680 idx++;
2681 }
2682
2683 *outputs = list;
2684 return session->snapshot.nb_output;
2685
2686 free_error:
2687 free(list);
2688 error:
2689 return -ret;
2690 }
2691
2692 /*
2693 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2694 * snapshot output is *not* set with a remote destination.
2695 *
2696 * Return 0 on success or a LTTNG_ERR code.
2697 */
2698 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2699 struct snapshot_output *snap_output, struct ltt_session *session)
2700 {
2701 int ret = LTTNG_OK;
2702 struct lttng_ht_iter iter;
2703 struct consumer_socket *socket;
2704
2705 assert(consumer);
2706 assert(snap_output);
2707 assert(session);
2708
2709 DBG2("Set relayd object from snapshot output");
2710
2711 /* Ignore if snapshot consumer output is not network. */
2712 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2713 goto error;
2714 }
2715
2716 /*
2717 * For each consumer socket, create and send the relayd object of the
2718 * snapshot output.
2719 */
2720 rcu_read_lock();
2721 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2722 socket, node.node) {
2723 ret = send_consumer_relayd_sockets(0, session->id,
2724 snap_output->consumer, socket,
2725 session->name, session->hostname,
2726 session->live_timer);
2727 if (ret != LTTNG_OK) {
2728 rcu_read_unlock();
2729 goto error;
2730 }
2731 }
2732 rcu_read_unlock();
2733
2734 error:
2735 return ret;
2736 }
2737
2738 /*
2739 * Record a kernel snapshot.
2740 *
2741 * Return LTTNG_OK on success or a LTTNG_ERR code.
2742 */
2743 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2744 struct snapshot_output *output, struct ltt_session *session,
2745 int wait, int nb_streams)
2746 {
2747 int ret;
2748
2749 assert(ksess);
2750 assert(output);
2751 assert(session);
2752
2753 /* Get the datetime for the snapshot output directory. */
2754 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2755 sizeof(output->datetime));
2756 if (!ret) {
2757 ret = LTTNG_ERR_INVALID;
2758 goto error;
2759 }
2760
2761 /*
2762 * Copy kernel session sockets so we can communicate with the right
2763 * consumer for the snapshot record command.
2764 */
2765 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2766 if (ret < 0) {
2767 ret = LTTNG_ERR_NOMEM;
2768 goto error;
2769 }
2770
2771 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2772 if (ret != LTTNG_OK) {
2773 goto error_snapshot;
2774 }
2775
2776 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2777 if (ret != LTTNG_OK) {
2778 goto error_snapshot;
2779 }
2780
2781 ret = LTTNG_OK;
2782
2783 error_snapshot:
2784 /* Clean up copied sockets so this output can use some other later on. */
2785 consumer_destroy_output_sockets(output->consumer);
2786 error:
2787 return ret;
2788 }
2789
2790 /*
2791 * Record a UST snapshot.
2792 *
2793 * Return 0 on success or a LTTNG_ERR error code.
2794 */
2795 static int record_ust_snapshot(struct ltt_ust_session *usess,
2796 struct snapshot_output *output, struct ltt_session *session,
2797 int wait, int nb_streams)
2798 {
2799 int ret;
2800
2801 assert(usess);
2802 assert(output);
2803 assert(session);
2804
2805 /* Get the datetime for the snapshot output directory. */
2806 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2807 sizeof(output->datetime));
2808 if (!ret) {
2809 ret = LTTNG_ERR_INVALID;
2810 goto error;
2811 }
2812
2813 /*
2814 * Copy UST session sockets so we can communicate with the right
2815 * consumer for the snapshot record command.
2816 */
2817 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2818 if (ret < 0) {
2819 ret = LTTNG_ERR_NOMEM;
2820 goto error;
2821 }
2822
2823 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2824 if (ret != LTTNG_OK) {
2825 goto error_snapshot;
2826 }
2827
2828 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2829 if (ret < 0) {
2830 if (ret == -EINVAL) {
2831 ret = LTTNG_ERR_INVALID;
2832 goto error_snapshot;
2833 }
2834
2835 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2836 goto error_snapshot;
2837 }
2838
2839 ret = LTTNG_OK;
2840
2841 error_snapshot:
2842 /* Clean up copied sockets so this output can use some other later on. */
2843 consumer_destroy_output_sockets(output->consumer);
2844 error:
2845 return ret;
2846 }
2847
2848 /*
2849 * Returns the total number of streams for a session or a negative value
2850 * on error.
2851 */
2852 static unsigned int get_total_nb_stream(struct ltt_session *session)
2853 {
2854 unsigned int total_streams = 0;
2855
2856 if (session->kernel_session) {
2857 struct ltt_kernel_session *ksess = session->kernel_session;
2858
2859 total_streams += ksess->stream_count_global;
2860 }
2861
2862 if (session->ust_session) {
2863 struct ltt_ust_session *usess = session->ust_session;
2864
2865 total_streams += ust_app_get_nb_stream(usess);
2866 }
2867
2868 return total_streams;
2869 }
2870
2871 /*
2872 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2873 *
2874 * The wait parameter is ignored so this call always wait for the snapshot to
2875 * complete before returning.
2876 *
2877 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2878 */
2879 int cmd_snapshot_record(struct ltt_session *session,
2880 struct lttng_snapshot_output *output, int wait)
2881 {
2882 int ret = LTTNG_OK;
2883 unsigned int use_tmp_output = 0;
2884 struct snapshot_output tmp_output;
2885 unsigned int nb_streams, snapshot_success = 0;
2886
2887 assert(session);
2888
2889 DBG("Cmd snapshot record for session %s", session->name);
2890
2891 /*
2892 * Permission denied to create an output if the session is not
2893 * set in no output mode.
2894 */
2895 if (session->output_traces) {
2896 ret = LTTNG_ERR_EPERM;
2897 goto error;
2898 }
2899
2900 /* The session needs to be started at least once. */
2901 if (!session->started) {
2902 ret = LTTNG_ERR_START_SESSION_ONCE;
2903 goto error;
2904 }
2905
2906 /* Use temporary output for the session. */
2907 if (output && *output->ctrl_url != '\0') {
2908 ret = snapshot_output_init(output->max_size, output->name,
2909 output->ctrl_url, output->data_url, session->consumer,
2910 &tmp_output, NULL);
2911 if (ret < 0) {
2912 if (ret == -ENOMEM) {
2913 ret = LTTNG_ERR_NOMEM;
2914 } else {
2915 ret = LTTNG_ERR_INVALID;
2916 }
2917 goto error;
2918 }
2919 /* Use the global session count for the temporary snapshot. */
2920 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2921 use_tmp_output = 1;
2922 }
2923
2924 /*
2925 * Get the total number of stream of that session which is used by the
2926 * maximum size of the snapshot feature.
2927 */
2928 nb_streams = get_total_nb_stream(session);
2929
2930 if (session->kernel_session) {
2931 struct ltt_kernel_session *ksess = session->kernel_session;
2932
2933 if (use_tmp_output) {
2934 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2935 wait, nb_streams);
2936 if (ret != LTTNG_OK) {
2937 goto error;
2938 }
2939 snapshot_success = 1;
2940 } else {
2941 struct snapshot_output *sout;
2942 struct lttng_ht_iter iter;
2943
2944 rcu_read_lock();
2945 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2946 &iter.iter, sout, node.node) {
2947 /*
2948 * Make a local copy of the output and assign the possible
2949 * temporary value given by the caller.
2950 */
2951 memset(&tmp_output, 0, sizeof(tmp_output));
2952 memcpy(&tmp_output, sout, sizeof(tmp_output));
2953
2954 /* Use temporary max size. */
2955 if (output->max_size != (uint64_t) -1ULL) {
2956 tmp_output.max_size = output->max_size;
2957 }
2958
2959 /* Use temporary name. */
2960 if (*output->name != '\0') {
2961 strncpy(tmp_output.name, output->name,
2962 sizeof(tmp_output.name));
2963 }
2964
2965 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2966
2967 ret = record_kernel_snapshot(ksess, &tmp_output,
2968 session, wait, nb_streams);
2969 if (ret != LTTNG_OK) {
2970 rcu_read_unlock();
2971 goto error;
2972 }
2973 snapshot_success = 1;
2974 }
2975 rcu_read_unlock();
2976 }
2977 }
2978
2979 if (session->ust_session) {
2980 struct ltt_ust_session *usess = session->ust_session;
2981
2982 if (use_tmp_output) {
2983 ret = record_ust_snapshot(usess, &tmp_output, session,
2984 wait, nb_streams);
2985 if (ret != LTTNG_OK) {
2986 goto error;
2987 }
2988 snapshot_success = 1;
2989 } else {
2990 struct snapshot_output *sout;
2991 struct lttng_ht_iter iter;
2992
2993 rcu_read_lock();
2994 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2995 &iter.iter, sout, node.node) {
2996 /*
2997 * Make a local copy of the output and assign the possible
2998 * temporary value given by the caller.
2999 */
3000 memset(&tmp_output, 0, sizeof(tmp_output));
3001 memcpy(&tmp_output, sout, sizeof(tmp_output));
3002
3003 /* Use temporary max size. */
3004 if (output->max_size != (uint64_t) -1ULL) {
3005 tmp_output.max_size = output->max_size;
3006 }
3007
3008 /* Use temporary name. */
3009 if (*output->name != '\0') {
3010 strncpy(tmp_output.name, output->name,
3011 sizeof(tmp_output.name));
3012 }
3013
3014 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3015
3016 ret = record_ust_snapshot(usess, &tmp_output, session,
3017 wait, nb_streams);
3018 if (ret != LTTNG_OK) {
3019 rcu_read_unlock();
3020 goto error;
3021 }
3022 snapshot_success = 1;
3023 }
3024 rcu_read_unlock();
3025 }
3026 }
3027
3028 if (snapshot_success) {
3029 session->snapshot.nb_snapshot++;
3030 } else {
3031 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3032 }
3033
3034 error:
3035 return ret;
3036 }
3037
3038 /*
3039 * Init command subsystem.
3040 */
3041 void cmd_init(void)
3042 {
3043 /*
3044 * Set network sequence index to 1 for streams to match a relayd
3045 * socket on the consumer side.
3046 */
3047 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3048 relayd_net_seq_idx = 1;
3049 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3050
3051 DBG("Command subsystem initialized");
3052 }
LTTng 2.0 tools and control repository
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