Fix: Returned code when listing kernel channel
[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 <urcu/list.h>
21 #include <urcu/uatomic.h>
22
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
27
28 #include "channel.h"
29 #include "consumer.h"
30 #include "event.h"
31 #include "kernel.h"
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
34 #include "utils.h"
35
36 #include "cmd.h"
37
38 /*
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
41 * to send to.
42 *
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
45 */
46 static unsigned int relayd_net_seq_idx;
47
48 /*
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
51 */
52 static int build_network_session_path(char *dst, size_t size,
53 struct ltt_session *session)
54 {
55 int ret, kdata_port, udata_port;
56 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
57 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
58
59 assert(session);
60 assert(dst);
61
62 memset(tmp_urls, 0, sizeof(tmp_urls));
63 memset(tmp_uurl, 0, sizeof(tmp_uurl));
64
65 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
66
67 if (session->kernel_session && session->kernel_session->consumer) {
68 kuri = &session->kernel_session->consumer->dst.net.control;
69 kdata_port = session->kernel_session->consumer->dst.net.data.port;
70 }
71
72 if (session->ust_session && session->ust_session->consumer) {
73 uuri = &session->ust_session->consumer->dst.net.control;
74 udata_port = session->ust_session->consumer->dst.net.data.port;
75 }
76
77 if (uuri == NULL && kuri == NULL) {
78 uri = &session->consumer->dst.net.control;
79 kdata_port = session->consumer->dst.net.data.port;
80 } else if (kuri && uuri) {
81 ret = uri_compare(kuri, uuri);
82 if (ret) {
83 /* Not Equal */
84 uri = kuri;
85 /* Build uuri URL string */
86 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
87 if (ret < 0) {
88 goto error;
89 }
90 } else {
91 uri = kuri;
92 }
93 } else if (kuri && uuri == NULL) {
94 uri = kuri;
95 } else if (uuri && kuri == NULL) {
96 uri = uuri;
97 }
98
99 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
100 if (ret < 0) {
101 goto error;
102 }
103
104 if (strlen(tmp_uurl) > 0) {
105 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
106 tmp_urls, kdata_port, tmp_uurl, udata_port);
107 } else {
108 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, kdata_port);
109 }
110
111 error:
112 return ret;
113 }
114
115 /*
116 * Fill lttng_channel array of all channels.
117 */
118 static void list_lttng_channels(int domain, struct ltt_session *session,
119 struct lttng_channel *channels)
120 {
121 int i = 0;
122 struct ltt_kernel_channel *kchan;
123
124 DBG("Listing channels for session %s", session->name);
125
126 switch (domain) {
127 case LTTNG_DOMAIN_KERNEL:
128 /* Kernel channels */
129 if (session->kernel_session != NULL) {
130 cds_list_for_each_entry(kchan,
131 &session->kernel_session->channel_list.head, list) {
132 /* Copy lttng_channel struct to array */
133 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
134 channels[i].enabled = kchan->enabled;
135 i++;
136 }
137 }
138 break;
139 case LTTNG_DOMAIN_UST:
140 {
141 struct lttng_ht_iter iter;
142 struct ltt_ust_channel *uchan;
143
144 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
145 &iter.iter, uchan, node.node) {
146 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
147 channels[i].attr.overwrite = uchan->attr.overwrite;
148 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
149 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
150 channels[i].attr.switch_timer_interval =
151 uchan->attr.switch_timer_interval;
152 channels[i].attr.read_timer_interval =
153 uchan->attr.read_timer_interval;
154 channels[i].enabled = uchan->enabled;
155 switch (uchan->attr.output) {
156 case LTTNG_UST_MMAP:
157 default:
158 channels[i].attr.output = LTTNG_EVENT_MMAP;
159 break;
160 }
161 i++;
162 }
163 break;
164 }
165 default:
166 break;
167 }
168 }
169
170 /*
171 * Create a list of ust global domain events.
172 */
173 static int list_lttng_ust_global_events(char *channel_name,
174 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
175 {
176 int i = 0, ret = 0;
177 unsigned int nb_event = 0;
178 struct lttng_ht_iter iter;
179 struct lttng_ht_node_str *node;
180 struct ltt_ust_channel *uchan;
181 struct ltt_ust_event *uevent;
182 struct lttng_event *tmp;
183
184 DBG("Listing UST global events for channel %s", channel_name);
185
186 rcu_read_lock();
187
188 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
189 node = lttng_ht_iter_get_node_str(&iter);
190 if (node == NULL) {
191 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
192 goto error;
193 }
194
195 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
196
197 nb_event += lttng_ht_get_count(uchan->events);
198
199 if (nb_event == 0) {
200 ret = nb_event;
201 goto error;
202 }
203
204 DBG3("Listing UST global %d events", nb_event);
205
206 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
207 if (tmp == NULL) {
208 ret = LTTNG_ERR_FATAL;
209 goto error;
210 }
211
212 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
213 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
214 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
215 tmp[i].enabled = uevent->enabled;
216
217 switch (uevent->attr.instrumentation) {
218 case LTTNG_UST_TRACEPOINT:
219 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
220 break;
221 case LTTNG_UST_PROBE:
222 tmp[i].type = LTTNG_EVENT_PROBE;
223 break;
224 case LTTNG_UST_FUNCTION:
225 tmp[i].type = LTTNG_EVENT_FUNCTION;
226 break;
227 }
228
229 tmp[i].loglevel = uevent->attr.loglevel;
230 switch (uevent->attr.loglevel_type) {
231 case LTTNG_UST_LOGLEVEL_ALL:
232 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
233 break;
234 case LTTNG_UST_LOGLEVEL_RANGE:
235 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
236 break;
237 case LTTNG_UST_LOGLEVEL_SINGLE:
238 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
239 break;
240 }
241 if (uevent->filter) {
242 tmp[i].filter = 1;
243 }
244 i++;
245 }
246
247 ret = nb_event;
248 *events = tmp;
249
250 error:
251 rcu_read_unlock();
252 return ret;
253 }
254
255 /*
256 * Fill lttng_event array of all kernel events in the channel.
257 */
258 static int list_lttng_kernel_events(char *channel_name,
259 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
260 {
261 int i = 0, ret;
262 unsigned int nb_event;
263 struct ltt_kernel_event *event;
264 struct ltt_kernel_channel *kchan;
265
266 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
267 if (kchan == NULL) {
268 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
269 goto error;
270 }
271
272 nb_event = kchan->event_count;
273
274 DBG("Listing events for channel %s", kchan->channel->name);
275
276 if (nb_event == 0) {
277 goto end;
278 }
279
280 *events = zmalloc(nb_event * sizeof(struct lttng_event));
281 if (*events == NULL) {
282 ret = LTTNG_ERR_FATAL;
283 goto error;
284 }
285
286 /* Kernel channels */
287 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
288 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
289 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
290 (*events)[i].enabled = event->enabled;
291
292 switch (event->event->instrumentation) {
293 case LTTNG_KERNEL_TRACEPOINT:
294 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
295 break;
296 case LTTNG_KERNEL_KPROBE:
297 case LTTNG_KERNEL_KRETPROBE:
298 (*events)[i].type = LTTNG_EVENT_PROBE;
299 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
300 sizeof(struct lttng_kernel_kprobe));
301 break;
302 case LTTNG_KERNEL_FUNCTION:
303 (*events)[i].type = LTTNG_EVENT_FUNCTION;
304 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
305 sizeof(struct lttng_kernel_function));
306 break;
307 case LTTNG_KERNEL_NOOP:
308 (*events)[i].type = LTTNG_EVENT_NOOP;
309 break;
310 case LTTNG_KERNEL_SYSCALL:
311 (*events)[i].type = LTTNG_EVENT_SYSCALL;
312 break;
313 case LTTNG_KERNEL_ALL:
314 assert(0);
315 break;
316 }
317 i++;
318 }
319
320 end:
321 return nb_event;
322
323 error:
324 /* Negate the error code to differentiate the size from an error */
325 return -ret;
326 }
327
328 /*
329 * Add URI so the consumer output object. Set the correct path depending on the
330 * domain adding the default trace directory.
331 */
332 static int add_uri_to_consumer(struct consumer_output *consumer,
333 struct lttng_uri *uri, int domain, const char *session_name)
334 {
335 int ret = LTTNG_OK;
336 const char *default_trace_dir;
337
338 assert(uri);
339
340 if (consumer == NULL) {
341 DBG("No consumer detected. Don't add URI. Stopping.");
342 ret = LTTNG_ERR_NO_CONSUMER;
343 goto error;
344 }
345
346 switch (domain) {
347 case LTTNG_DOMAIN_KERNEL:
348 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
349 break;
350 case LTTNG_DOMAIN_UST:
351 default_trace_dir = DEFAULT_UST_TRACE_DIR;
352 break;
353 default:
354 /*
355 * This case is possible is we try to add the URI to the global tracing
356 * session consumer object which in this case there is no subdir.
357 */
358 default_trace_dir = "";
359 }
360
361 switch (uri->dtype) {
362 case LTTNG_DST_IPV4:
363 case LTTNG_DST_IPV6:
364 DBG2("Setting network URI to consumer");
365
366 /* Set URI into consumer output object */
367 ret = consumer_set_network_uri(consumer, uri);
368 if (ret < 0) {
369 ret = LTTNG_ERR_FATAL;
370 goto error;
371 } else if (ret == 1) {
372 /*
373 * URI was the same in the consumer so we do not append the subdir
374 * again so to not duplicate output dir.
375 */
376 goto error;
377 }
378
379 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
380 ret = consumer_set_subdir(consumer, session_name);
381 if (ret < 0) {
382 ret = LTTNG_ERR_FATAL;
383 goto error;
384 }
385 }
386
387 if (uri->stype == LTTNG_STREAM_CONTROL) {
388 /* On a new subdir, reappend the default trace dir. */
389 strncat(consumer->subdir, default_trace_dir,
390 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
391 DBG3("Append domain trace name to subdir %s", consumer->subdir);
392 }
393
394 break;
395 case LTTNG_DST_PATH:
396 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
397 memset(consumer->dst.trace_path, 0,
398 sizeof(consumer->dst.trace_path));
399 strncpy(consumer->dst.trace_path, uri->dst.path,
400 sizeof(consumer->dst.trace_path));
401 /* Append default trace dir */
402 strncat(consumer->dst.trace_path, default_trace_dir,
403 sizeof(consumer->dst.trace_path) -
404 strlen(consumer->dst.trace_path) - 1);
405 /* Flag consumer as local. */
406 consumer->type = CONSUMER_DST_LOCAL;
407 break;
408 }
409
410 error:
411 return ret;
412 }
413
414 /*
415 * Init tracing by creating trace directory and sending fds kernel consumer.
416 */
417 static int init_kernel_tracing(struct ltt_kernel_session *session)
418 {
419 int ret = 0;
420 struct lttng_ht_iter iter;
421 struct consumer_socket *socket;
422
423 assert(session);
424
425 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
426 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
427 socket, node.node) {
428 /* Code flow error */
429 assert(socket->fd >= 0);
430
431 pthread_mutex_lock(socket->lock);
432 ret = kernel_consumer_send_session(socket->fd, session);
433 pthread_mutex_unlock(socket->lock);
434 if (ret < 0) {
435 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
436 goto error;
437 }
438 }
439 }
440
441 error:
442 return ret;
443 }
444
445 /*
446 * Create a socket to the relayd using the URI.
447 *
448 * On success, the relayd_sock pointer is set to the created socket.
449 * Else, it's stays untouched and a lttcomm error code is returned.
450 */
451 static int create_connect_relayd(struct consumer_output *output,
452 const char *session_name, struct lttng_uri *uri,
453 struct lttcomm_sock **relayd_sock)
454 {
455 int ret;
456 struct lttcomm_sock *sock;
457
458 /* Create socket object from URI */
459 sock = lttcomm_alloc_sock_from_uri(uri);
460 if (sock == NULL) {
461 ret = LTTNG_ERR_FATAL;
462 goto error;
463 }
464
465 ret = lttcomm_create_sock(sock);
466 if (ret < 0) {
467 ret = LTTNG_ERR_FATAL;
468 goto error;
469 }
470
471 /* Connect to relayd so we can proceed with a session creation. */
472 ret = relayd_connect(sock);
473 if (ret < 0) {
474 ERR("Unable to reach lttng-relayd");
475 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
476 goto free_sock;
477 }
478
479 /* Create socket for control stream. */
480 if (uri->stype == LTTNG_STREAM_CONTROL) {
481 DBG3("Creating relayd stream socket from URI");
482
483 /* Check relayd version */
484 ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
485 RELAYD_VERSION_COMM_MINOR);
486 if (ret < 0) {
487 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
488 goto close_sock;
489 }
490 } else if (uri->stype == LTTNG_STREAM_DATA) {
491 DBG3("Creating relayd data socket from URI");
492 } else {
493 /* Command is not valid */
494 ERR("Relayd invalid stream type: %d", uri->stype);
495 ret = LTTNG_ERR_INVALID;
496 goto close_sock;
497 }
498
499 *relayd_sock = sock;
500
501 return LTTNG_OK;
502
503 close_sock:
504 if (sock) {
505 (void) relayd_close(sock);
506 }
507 free_sock:
508 if (sock) {
509 lttcomm_destroy_sock(sock);
510 }
511 error:
512 return ret;
513 }
514
515 /*
516 * Connect to the relayd using URI and send the socket to the right consumer.
517 */
518 static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
519 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
520 int consumer_fd)
521 {
522 int ret;
523 struct lttcomm_sock *sock = NULL;
524
525 /* Set the network sequence index if not set. */
526 if (consumer->net_seq_index == -1) {
527 /*
528 * Increment net_seq_idx because we are about to transfer the
529 * new relayd socket to the consumer.
530 */
531 uatomic_inc(&relayd_net_seq_idx);
532 /* Assign unique key so the consumer can match streams */
533 uatomic_set(&consumer->net_seq_index,
534 uatomic_read(&relayd_net_seq_idx));
535 }
536
537 /* Connect to relayd and make version check if uri is the control. */
538 ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
539 if (ret != LTTNG_OK) {
540 goto close_sock;
541 }
542
543 /* If the control socket is connected, network session is ready */
544 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
545 session->net_handle = 1;
546 }
547
548 /* Send relayd socket to consumer. */
549 ret = consumer_send_relayd_socket(consumer_fd, sock,
550 consumer, relayd_uri->stype);
551 if (ret < 0) {
552 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
553 goto close_sock;
554 }
555
556 ret = LTTNG_OK;
557
558 /*
559 * Close socket which was dup on the consumer side. The session daemon does
560 * NOT keep track of the relayd socket(s) once transfer to the consumer.
561 */
562
563 close_sock:
564 if (sock) {
565 (void) relayd_close(sock);
566 lttcomm_destroy_sock(sock);
567 }
568
569 return ret;
570 }
571
572 /*
573 * Send both relayd sockets to a specific consumer and domain. This is a
574 * helper function to facilitate sending the information to the consumer for a
575 * session.
576 */
577 static int send_consumer_relayd_sockets(int domain,
578 struct ltt_session *session, struct consumer_output *consumer, int fd)
579 {
580 int ret;
581
582 assert(session);
583 assert(consumer);
584
585 /* Don't resend the sockets to the consumer. */
586 if (consumer->dst.net.relayd_socks_sent) {
587 ret = LTTNG_OK;
588 goto error;
589 }
590
591 /* Sending control relayd socket. */
592 ret = send_consumer_relayd_socket(domain, session,
593 &consumer->dst.net.control, consumer, fd);
594 if (ret != LTTNG_OK) {
595 goto error;
596 }
597
598 /* Sending data relayd socket. */
599 ret = send_consumer_relayd_socket(domain, session,
600 &consumer->dst.net.data, consumer, fd);
601 if (ret != LTTNG_OK) {
602 goto error;
603 }
604
605 /* Flag that all relayd sockets were sent to the consumer. */
606 consumer->dst.net.relayd_socks_sent = 1;
607
608 error:
609 return ret;
610 }
611
612 /*
613 * Setup relayd connections for a tracing session. First creates the socket to
614 * the relayd and send them to the right domain consumer. Consumer type MUST be
615 * network.
616 */
617 static int setup_relayd(struct ltt_session *session)
618 {
619 int ret = LTTNG_OK;
620 struct ltt_ust_session *usess;
621 struct ltt_kernel_session *ksess;
622 struct consumer_socket *socket;
623 struct lttng_ht_iter iter;
624
625 assert(session);
626
627 usess = session->ust_session;
628 ksess = session->kernel_session;
629
630 DBG2("Setting relayd for session %s", session->name);
631
632 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
633 && usess->consumer->enabled) {
634 /* For each consumer socket, send relayd sockets */
635 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
636 socket, node.node) {
637 /* Code flow error */
638 assert(socket->fd >= 0);
639
640 pthread_mutex_lock(socket->lock);
641 send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
642 usess->consumer, socket->fd);
643 pthread_mutex_unlock(socket->lock);
644 if (ret != LTTNG_OK) {
645 goto error;
646 }
647 }
648 }
649
650 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
651 && ksess->consumer->enabled) {
652 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
653 socket, node.node) {
654 /* Code flow error */
655 assert(socket->fd >= 0);
656
657 pthread_mutex_lock(socket->lock);
658 send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
659 ksess->consumer, socket->fd);
660 pthread_mutex_unlock(socket->lock);
661 if (ret != LTTNG_OK) {
662 goto error;
663 }
664 }
665 }
666
667 error:
668 return ret;
669 }
670
671 /*
672 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
673 */
674 int cmd_disable_channel(struct ltt_session *session, int domain,
675 char *channel_name)
676 {
677 int ret;
678 struct ltt_ust_session *usess;
679
680 usess = session->ust_session;
681
682 switch (domain) {
683 case LTTNG_DOMAIN_KERNEL:
684 {
685 ret = channel_kernel_disable(session->kernel_session,
686 channel_name);
687 if (ret != LTTNG_OK) {
688 goto error;
689 }
690
691 kernel_wait_quiescent(kernel_tracer_fd);
692 break;
693 }
694 case LTTNG_DOMAIN_UST:
695 {
696 struct ltt_ust_channel *uchan;
697 struct lttng_ht *chan_ht;
698
699 chan_ht = usess->domain_global.channels;
700
701 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
702 if (uchan == NULL) {
703 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
704 goto error;
705 }
706
707 ret = channel_ust_disable(usess, domain, uchan);
708 if (ret != LTTNG_OK) {
709 goto error;
710 }
711 break;
712 }
713 #if 0
714 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
715 case LTTNG_DOMAIN_UST_EXEC_NAME:
716 case LTTNG_DOMAIN_UST_PID:
717 #endif
718 default:
719 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
720 goto error;
721 }
722
723 ret = LTTNG_OK;
724
725 error:
726 return ret;
727 }
728
729 /*
730 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
731 *
732 * The wpipe arguments is used as a notifier for the kernel thread.
733 */
734 int cmd_enable_channel(struct ltt_session *session,
735 int domain, struct lttng_channel *attr, int wpipe)
736 {
737 int ret;
738 struct ltt_ust_session *usess = session->ust_session;
739 struct lttng_ht *chan_ht;
740
741 assert(session);
742 assert(attr);
743
744 DBG("Enabling channel %s for session %s", attr->name, session->name);
745
746 switch (domain) {
747 case LTTNG_DOMAIN_KERNEL:
748 {
749 struct ltt_kernel_channel *kchan;
750
751 /* Mandatory for a kernel channel. */
752 assert(wpipe > 0);
753
754 kchan = trace_kernel_get_channel_by_name(attr->name,
755 session->kernel_session);
756 if (kchan == NULL) {
757 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
758 } else {
759 ret = channel_kernel_enable(session->kernel_session, kchan);
760 }
761
762 if (ret != LTTNG_OK) {
763 goto error;
764 }
765
766 kernel_wait_quiescent(kernel_tracer_fd);
767 break;
768 }
769 case LTTNG_DOMAIN_UST:
770 {
771 struct ltt_ust_channel *uchan;
772
773 chan_ht = usess->domain_global.channels;
774
775 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
776 if (uchan == NULL) {
777 ret = channel_ust_create(usess, domain, attr);
778 } else {
779 ret = channel_ust_enable(usess, domain, uchan);
780 }
781 break;
782 }
783 #if 0
784 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
785 case LTTNG_DOMAIN_UST_EXEC_NAME:
786 case LTTNG_DOMAIN_UST_PID:
787 #endif
788 default:
789 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
790 goto error;
791 }
792
793 error:
794 return ret;
795 }
796
797
798 /*
799 * Command LTTNG_DISABLE_EVENT processed by the client thread.
800 */
801 int cmd_disable_event(struct ltt_session *session, int domain,
802 char *channel_name, char *event_name)
803 {
804 int ret;
805
806 switch (domain) {
807 case LTTNG_DOMAIN_KERNEL:
808 {
809 struct ltt_kernel_channel *kchan;
810 struct ltt_kernel_session *ksess;
811
812 ksess = session->kernel_session;
813
814 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
815 if (kchan == NULL) {
816 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
817 goto error;
818 }
819
820 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
821 if (ret != LTTNG_OK) {
822 goto error;
823 }
824
825 kernel_wait_quiescent(kernel_tracer_fd);
826 break;
827 }
828 case LTTNG_DOMAIN_UST:
829 {
830 struct ltt_ust_channel *uchan;
831 struct ltt_ust_session *usess;
832
833 usess = session->ust_session;
834
835 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
836 channel_name);
837 if (uchan == NULL) {
838 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
839 goto error;
840 }
841
842 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
843 if (ret != LTTNG_OK) {
844 goto error;
845 }
846
847 DBG3("Disable UST event %s in channel %s completed", event_name,
848 channel_name);
849 break;
850 }
851 #if 0
852 case LTTNG_DOMAIN_UST_EXEC_NAME:
853 case LTTNG_DOMAIN_UST_PID:
854 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
855 #endif
856 default:
857 ret = LTTNG_ERR_UND;
858 goto error;
859 }
860
861 ret = LTTNG_OK;
862
863 error:
864 return ret;
865 }
866
867 /*
868 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
869 */
870 int cmd_disable_event_all(struct ltt_session *session, int domain,
871 char *channel_name)
872 {
873 int ret;
874
875 switch (domain) {
876 case LTTNG_DOMAIN_KERNEL:
877 {
878 struct ltt_kernel_session *ksess;
879 struct ltt_kernel_channel *kchan;
880
881 ksess = session->kernel_session;
882
883 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
884 if (kchan == NULL) {
885 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
886 goto error;
887 }
888
889 ret = event_kernel_disable_all(ksess, kchan);
890 if (ret != LTTNG_OK) {
891 goto error;
892 }
893
894 kernel_wait_quiescent(kernel_tracer_fd);
895 break;
896 }
897 case LTTNG_DOMAIN_UST:
898 {
899 struct ltt_ust_session *usess;
900 struct ltt_ust_channel *uchan;
901
902 usess = session->ust_session;
903
904 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
905 channel_name);
906 if (uchan == NULL) {
907 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
908 goto error;
909 }
910
911 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
912 if (ret != 0) {
913 goto error;
914 }
915
916 DBG3("Disable all UST events in channel %s completed", channel_name);
917
918 break;
919 }
920 #if 0
921 case LTTNG_DOMAIN_UST_EXEC_NAME:
922 case LTTNG_DOMAIN_UST_PID:
923 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
924 #endif
925 default:
926 ret = LTTNG_ERR_UND;
927 goto error;
928 }
929
930 ret = LTTNG_OK;
931
932 error:
933 return ret;
934 }
935
936 /*
937 * Command LTTNG_ADD_CONTEXT processed by the client thread.
938 */
939 int cmd_add_context(struct ltt_session *session, int domain,
940 char *channel_name, char *event_name, struct lttng_event_context *ctx)
941 {
942 int ret;
943
944 switch (domain) {
945 case LTTNG_DOMAIN_KERNEL:
946 /* Add kernel context to kernel tracer */
947 ret = context_kernel_add(session->kernel_session, ctx,
948 event_name, channel_name);
949 if (ret != LTTNG_OK) {
950 goto error;
951 }
952 break;
953 case LTTNG_DOMAIN_UST:
954 {
955 struct ltt_ust_session *usess = session->ust_session;
956
957 assert(usess);
958
959 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
960 if (ret != LTTNG_OK) {
961 goto error;
962 }
963 break;
964 }
965 #if 0
966 case LTTNG_DOMAIN_UST_EXEC_NAME:
967 case LTTNG_DOMAIN_UST_PID:
968 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
969 #endif
970 default:
971 ret = LTTNG_ERR_UND;
972 goto error;
973 }
974
975 ret = LTTNG_OK;
976
977 error:
978 return ret;
979 }
980
981 /*
982 * Command LTTNG_SET_FILTER processed by the client thread.
983 */
984 int cmd_set_filter(struct ltt_session *session, int domain,
985 char *channel_name, char *event_name,
986 struct lttng_filter_bytecode *bytecode)
987 {
988 int ret;
989
990 switch (domain) {
991 case LTTNG_DOMAIN_KERNEL:
992 ret = LTTNG_ERR_FATAL;
993 break;
994 case LTTNG_DOMAIN_UST:
995 {
996 struct ltt_ust_session *usess = session->ust_session;
997
998 ret = filter_ust_set(usess, domain, bytecode, event_name, channel_name);
999 if (ret != LTTNG_OK) {
1000 goto error;
1001 }
1002 break;
1003 }
1004 #if 0
1005 case LTTNG_DOMAIN_UST_EXEC_NAME:
1006 case LTTNG_DOMAIN_UST_PID:
1007 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1008 #endif
1009 default:
1010 ret = LTTNG_ERR_UND;
1011 goto error;
1012 }
1013
1014 ret = LTTNG_OK;
1015
1016 error:
1017 return ret;
1018
1019 }
1020
1021
1022 /*
1023 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1024 */
1025 int cmd_enable_event(struct ltt_session *session, int domain,
1026 char *channel_name, struct lttng_event *event, int wpipe)
1027 {
1028 int ret;
1029 struct lttng_channel *attr;
1030
1031 assert(session);
1032 assert(event);
1033 assert(channel_name);
1034
1035 switch (domain) {
1036 case LTTNG_DOMAIN_KERNEL:
1037 {
1038 struct ltt_kernel_channel *kchan;
1039
1040 kchan = trace_kernel_get_channel_by_name(channel_name,
1041 session->kernel_session);
1042 if (kchan == NULL) {
1043 attr = channel_new_default_attr(domain);
1044 if (attr == NULL) {
1045 ret = LTTNG_ERR_FATAL;
1046 goto error;
1047 }
1048 strncpy(attr->name, channel_name, sizeof(attr->name));
1049
1050 ret = cmd_enable_channel(session, domain, attr, wpipe);
1051 if (ret != LTTNG_OK) {
1052 free(attr);
1053 goto error;
1054 }
1055 free(attr);
1056 }
1057
1058 /* Get the newly created kernel channel pointer */
1059 kchan = trace_kernel_get_channel_by_name(channel_name,
1060 session->kernel_session);
1061 if (kchan == NULL) {
1062 /* This sould not happen... */
1063 ret = LTTNG_ERR_FATAL;
1064 goto error;
1065 }
1066
1067 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
1068 event);
1069 if (ret != LTTNG_OK) {
1070 goto error;
1071 }
1072
1073 kernel_wait_quiescent(kernel_tracer_fd);
1074 break;
1075 }
1076 case LTTNG_DOMAIN_UST:
1077 {
1078 struct ltt_ust_channel *uchan;
1079 struct ltt_ust_session *usess = session->ust_session;
1080
1081 assert(usess);
1082
1083 /* Get channel from global UST domain */
1084 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1085 channel_name);
1086 if (uchan == NULL) {
1087 /* Create default channel */
1088 attr = channel_new_default_attr(domain);
1089 if (attr == NULL) {
1090 ret = LTTNG_ERR_FATAL;
1091 goto error;
1092 }
1093 strncpy(attr->name, channel_name, sizeof(attr->name));
1094
1095 ret = cmd_enable_channel(session, domain, attr, wpipe);
1096 if (ret != LTTNG_OK) {
1097 free(attr);
1098 goto error;
1099 }
1100 free(attr);
1101
1102 /* Get the newly created channel reference back */
1103 uchan = trace_ust_find_channel_by_name(
1104 usess->domain_global.channels, channel_name);
1105 assert(uchan);
1106 }
1107
1108 /* At this point, the session and channel exist on the tracer */
1109 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
1110 if (ret != LTTNG_OK) {
1111 goto error;
1112 }
1113 break;
1114 }
1115 #if 0
1116 case LTTNG_DOMAIN_UST_EXEC_NAME:
1117 case LTTNG_DOMAIN_UST_PID:
1118 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1119 #endif
1120 default:
1121 ret = LTTNG_ERR_UND;
1122 goto error;
1123 }
1124
1125 ret = LTTNG_OK;
1126
1127 error:
1128 return ret;
1129 }
1130
1131 /*
1132 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1133 */
1134 int cmd_enable_event_all(struct ltt_session *session, int domain,
1135 char *channel_name, int event_type, int wpipe)
1136 {
1137 int ret;
1138 struct lttng_channel *attr;
1139
1140 assert(session);
1141 assert(channel_name);
1142
1143 switch (domain) {
1144 case LTTNG_DOMAIN_KERNEL:
1145 {
1146 struct ltt_kernel_channel *kchan;
1147
1148 assert(session->kernel_session);
1149
1150 kchan = trace_kernel_get_channel_by_name(channel_name,
1151 session->kernel_session);
1152 if (kchan == NULL) {
1153 /* Create default channel */
1154 attr = channel_new_default_attr(domain);
1155 if (attr == NULL) {
1156 ret = LTTNG_ERR_FATAL;
1157 goto error;
1158 }
1159 strncpy(attr->name, channel_name, sizeof(attr->name));
1160
1161 ret = cmd_enable_channel(session, domain, attr, wpipe);
1162 if (ret != LTTNG_OK) {
1163 free(attr);
1164 goto error;
1165 }
1166 free(attr);
1167
1168 /* Get the newly created kernel channel pointer */
1169 kchan = trace_kernel_get_channel_by_name(channel_name,
1170 session->kernel_session);
1171 assert(kchan);
1172 }
1173
1174 switch (event_type) {
1175 case LTTNG_EVENT_SYSCALL:
1176 ret = event_kernel_enable_all_syscalls(session->kernel_session,
1177 kchan, kernel_tracer_fd);
1178 break;
1179 case LTTNG_EVENT_TRACEPOINT:
1180 /*
1181 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1182 * events already registered to the channel.
1183 */
1184 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
1185 kchan, kernel_tracer_fd);
1186 break;
1187 case LTTNG_EVENT_ALL:
1188 /* Enable syscalls and tracepoints */
1189 ret = event_kernel_enable_all(session->kernel_session,
1190 kchan, kernel_tracer_fd);
1191 break;
1192 default:
1193 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1194 goto error;
1195 }
1196
1197 /* Manage return value */
1198 if (ret != LTTNG_OK) {
1199 goto error;
1200 }
1201
1202 kernel_wait_quiescent(kernel_tracer_fd);
1203 break;
1204 }
1205 case LTTNG_DOMAIN_UST:
1206 {
1207 struct ltt_ust_channel *uchan;
1208 struct ltt_ust_session *usess = session->ust_session;
1209
1210 assert(usess);
1211
1212 /* Get channel from global UST domain */
1213 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1214 channel_name);
1215 if (uchan == NULL) {
1216 /* Create default channel */
1217 attr = channel_new_default_attr(domain);
1218 if (attr == NULL) {
1219 ret = LTTNG_ERR_FATAL;
1220 goto error;
1221 }
1222 strncpy(attr->name, channel_name, sizeof(attr->name));
1223
1224 ret = cmd_enable_channel(session, domain, attr, wpipe);
1225 if (ret != LTTNG_OK) {
1226 free(attr);
1227 goto error;
1228 }
1229 free(attr);
1230
1231 /* Get the newly created channel reference back */
1232 uchan = trace_ust_find_channel_by_name(
1233 usess->domain_global.channels, channel_name);
1234 assert(uchan);
1235 }
1236
1237 /* At this point, the session and channel exist on the tracer */
1238
1239 switch (event_type) {
1240 case LTTNG_EVENT_ALL:
1241 case LTTNG_EVENT_TRACEPOINT:
1242 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
1243 if (ret != LTTNG_OK) {
1244 goto error;
1245 }
1246 break;
1247 default:
1248 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1249 goto error;
1250 }
1251
1252 /* Manage return value */
1253 if (ret != LTTNG_OK) {
1254 goto error;
1255 }
1256
1257 break;
1258 }
1259 #if 0
1260 case LTTNG_DOMAIN_UST_EXEC_NAME:
1261 case LTTNG_DOMAIN_UST_PID:
1262 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1263 #endif
1264 default:
1265 ret = LTTNG_ERR_UND;
1266 goto error;
1267 }
1268
1269 ret = LTTNG_OK;
1270
1271 error:
1272 return ret;
1273 }
1274
1275
1276 /*
1277 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1278 */
1279 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1280 {
1281 int ret;
1282 ssize_t nb_events = 0;
1283
1284 switch (domain) {
1285 case LTTNG_DOMAIN_KERNEL:
1286 nb_events = kernel_list_events(kernel_tracer_fd, events);
1287 if (nb_events < 0) {
1288 ret = LTTNG_ERR_KERN_LIST_FAIL;
1289 goto error;
1290 }
1291 break;
1292 case LTTNG_DOMAIN_UST:
1293 nb_events = ust_app_list_events(events);
1294 if (nb_events < 0) {
1295 ret = LTTNG_ERR_UST_LIST_FAIL;
1296 goto error;
1297 }
1298 break;
1299 default:
1300 ret = LTTNG_ERR_UND;
1301 goto error;
1302 }
1303
1304 return nb_events;
1305
1306 error:
1307 /* Return negative value to differentiate return code */
1308 return -ret;
1309 }
1310
1311 /*
1312 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1313 */
1314 ssize_t cmd_list_tracepoint_fields(int domain,
1315 struct lttng_event_field **fields)
1316 {
1317 int ret;
1318 ssize_t nb_fields = 0;
1319
1320 switch (domain) {
1321 case LTTNG_DOMAIN_UST:
1322 nb_fields = ust_app_list_event_fields(fields);
1323 if (nb_fields < 0) {
1324 ret = LTTNG_ERR_UST_LIST_FAIL;
1325 goto error;
1326 }
1327 break;
1328 case LTTNG_DOMAIN_KERNEL:
1329 default: /* fall-through */
1330 ret = LTTNG_ERR_UND;
1331 goto error;
1332 }
1333
1334 return nb_fields;
1335
1336 error:
1337 /* Return negative value to differentiate return code */
1338 return -ret;
1339 }
1340
1341 /*
1342 * Command LTTNG_START_TRACE processed by the client thread.
1343 */
1344 int cmd_start_trace(struct ltt_session *session)
1345 {
1346 int ret;
1347 struct ltt_kernel_session *ksession;
1348 struct ltt_ust_session *usess;
1349 struct ltt_kernel_channel *kchan;
1350
1351 assert(session);
1352
1353 /* Ease our life a bit ;) */
1354 ksession = session->kernel_session;
1355 usess = session->ust_session;
1356
1357 if (session->enabled) {
1358 /* Already started. */
1359 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1360 goto error;
1361 }
1362
1363 session->enabled = 1;
1364
1365 ret = setup_relayd(session);
1366 if (ret != LTTNG_OK) {
1367 ERR("Error setting up relayd for session %s", session->name);
1368 goto error;
1369 }
1370
1371 /* Kernel tracing */
1372 if (ksession != NULL) {
1373 /* Open kernel metadata */
1374 if (ksession->metadata == NULL) {
1375 ret = kernel_open_metadata(ksession);
1376 if (ret < 0) {
1377 ret = LTTNG_ERR_KERN_META_FAIL;
1378 goto error;
1379 }
1380 }
1381
1382 /* Open kernel metadata stream */
1383 if (ksession->metadata_stream_fd < 0) {
1384 ret = kernel_open_metadata_stream(ksession);
1385 if (ret < 0) {
1386 ERR("Kernel create metadata stream failed");
1387 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1388 goto error;
1389 }
1390 }
1391
1392 /* For each channel */
1393 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1394 if (kchan->stream_count == 0) {
1395 ret = kernel_open_channel_stream(kchan);
1396 if (ret < 0) {
1397 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1398 goto error;
1399 }
1400 /* Update the stream global counter */
1401 ksession->stream_count_global += ret;
1402 }
1403 }
1404
1405 /* Setup kernel consumer socket and send fds to it */
1406 ret = init_kernel_tracing(ksession);
1407 if (ret < 0) {
1408 ret = LTTNG_ERR_KERN_START_FAIL;
1409 goto error;
1410 }
1411
1412 /* This start the kernel tracing */
1413 ret = kernel_start_session(ksession);
1414 if (ret < 0) {
1415 ret = LTTNG_ERR_KERN_START_FAIL;
1416 goto error;
1417 }
1418
1419 /* Quiescent wait after starting trace */
1420 kernel_wait_quiescent(kernel_tracer_fd);
1421 }
1422
1423 /* Flag session that trace should start automatically */
1424 if (usess) {
1425 usess->start_trace = 1;
1426
1427 ret = ust_app_start_trace_all(usess);
1428 if (ret < 0) {
1429 ret = LTTNG_ERR_UST_START_FAIL;
1430 goto error;
1431 }
1432 }
1433
1434 ret = LTTNG_OK;
1435
1436 error:
1437 return ret;
1438 }
1439
1440 /*
1441 * Command LTTNG_STOP_TRACE processed by the client thread.
1442 */
1443 int cmd_stop_trace(struct ltt_session *session)
1444 {
1445 int ret;
1446 struct ltt_kernel_channel *kchan;
1447 struct ltt_kernel_session *ksession;
1448 struct ltt_ust_session *usess;
1449
1450 assert(session);
1451
1452 /* Short cut */
1453 ksession = session->kernel_session;
1454 usess = session->ust_session;
1455
1456 if (!session->enabled) {
1457 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1458 goto error;
1459 }
1460
1461 session->enabled = 0;
1462
1463 /* Kernel tracer */
1464 if (ksession) {
1465 DBG("Stop kernel tracing");
1466
1467 /* Flush metadata if exist */
1468 if (ksession->metadata_stream_fd >= 0) {
1469 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1470 if (ret < 0) {
1471 ERR("Kernel metadata flush failed");
1472 }
1473 }
1474
1475 /* Flush all buffers before stopping */
1476 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1477 ret = kernel_flush_buffer(kchan);
1478 if (ret < 0) {
1479 ERR("Kernel flush buffer error");
1480 }
1481 }
1482
1483 ret = kernel_stop_session(ksession);
1484 if (ret < 0) {
1485 ret = LTTNG_ERR_KERN_STOP_FAIL;
1486 goto error;
1487 }
1488
1489 kernel_wait_quiescent(kernel_tracer_fd);
1490 }
1491
1492 if (usess) {
1493 usess->start_trace = 0;
1494
1495 ret = ust_app_stop_trace_all(usess);
1496 if (ret < 0) {
1497 ret = LTTNG_ERR_UST_STOP_FAIL;
1498 goto error;
1499 }
1500 }
1501
1502 ret = LTTNG_OK;
1503
1504 error:
1505 return ret;
1506 }
1507
1508 /*
1509 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1510 */
1511 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1512 size_t nb_uri, struct lttng_uri *uris)
1513 {
1514 int ret, i;
1515 struct ltt_kernel_session *ksess = session->kernel_session;
1516 struct ltt_ust_session *usess = session->ust_session;
1517 struct consumer_output *consumer = NULL;
1518
1519 assert(session);
1520 assert(uris);
1521 assert(nb_uri > 0);
1522
1523 /* Can't enable consumer after session started. */
1524 if (session->enabled) {
1525 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1526 goto error;
1527 }
1528
1529 if (!session->start_consumer) {
1530 ret = LTTNG_ERR_NO_CONSUMER;
1531 goto error;
1532 }
1533
1534 /*
1535 * This case switch makes sure the domain session has a temporary consumer
1536 * so the URL can be set.
1537 */
1538 switch (domain) {
1539 case 0:
1540 /* Code flow error. A session MUST always have a consumer object */
1541 assert(session->consumer);
1542 /*
1543 * The URL will be added to the tracing session consumer instead of a
1544 * specific domain consumer.
1545 */
1546 consumer = session->consumer;
1547 break;
1548 case LTTNG_DOMAIN_KERNEL:
1549 /* Code flow error if we don't have a kernel session here. */
1550 assert(ksess);
1551
1552 /* Create consumer output if none exists */
1553 consumer = ksess->tmp_consumer;
1554 if (consumer == NULL) {
1555 consumer = consumer_copy_output(ksess->consumer);
1556 if (consumer == NULL) {
1557 ret = LTTNG_ERR_FATAL;
1558 goto error;
1559 }
1560 /* Trash the consumer subdir, we are about to set a new one. */
1561 memset(consumer->subdir, 0, sizeof(consumer->subdir));
1562 ksess->tmp_consumer = consumer;
1563 }
1564
1565 break;
1566 case LTTNG_DOMAIN_UST:
1567 /* Code flow error if we don't have a kernel session here. */
1568 assert(usess);
1569
1570 /* Create consumer output if none exists */
1571 consumer = usess->tmp_consumer;
1572 if (consumer == NULL) {
1573 consumer = consumer_copy_output(usess->consumer);
1574 if (consumer == NULL) {
1575 ret = LTTNG_ERR_FATAL;
1576 goto error;
1577 }
1578 /* Trash the consumer subdir, we are about to set a new one. */
1579 memset(consumer->subdir, 0, sizeof(consumer->subdir));
1580 usess->tmp_consumer = consumer;
1581 }
1582
1583 break;
1584 }
1585
1586 for (i = 0; i < nb_uri; i++) {
1587 struct consumer_socket *socket;
1588 struct lttng_ht_iter iter;
1589
1590 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1591 if (ret < 0) {
1592 goto error;
1593 }
1594
1595 /*
1596 * Don't send relayd socket if URI is NOT remote or if the relayd
1597 * sockets for the session are already sent.
1598 */
1599 if (uris[i].dtype == LTTNG_DST_PATH ||
1600 consumer->dst.net.relayd_socks_sent) {
1601 continue;
1602 }
1603
1604 /* Try to send relayd URI to the consumer if exist. */
1605 rcu_read_lock();
1606 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter,
1607 socket, node.node) {
1608
1609 /* A socket in the HT should never have a negative fd */
1610 assert(socket->fd >= 0);
1611
1612 pthread_mutex_lock(socket->lock);
1613 ret = send_consumer_relayd_socket(domain, session, &uris[i],
1614 consumer, socket->fd);
1615 pthread_mutex_unlock(socket->lock);
1616 if (ret != LTTNG_OK) {
1617 rcu_read_unlock();
1618 goto error;
1619 }
1620 }
1621 rcu_read_unlock();
1622 }
1623
1624 /* All good! */
1625 ret = LTTNG_OK;
1626
1627 error:
1628 return ret;
1629 }
1630
1631 /*
1632 * Command LTTNG_CREATE_SESSION processed by the client thread.
1633 */
1634 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1635 size_t nb_uri, lttng_sock_cred *creds)
1636 {
1637 int ret;
1638 char *path = NULL;
1639 struct ltt_session *session;
1640
1641 assert(name);
1642
1643 /*
1644 * Verify if the session already exist
1645 *
1646 * XXX: There is no need for the session lock list here since the caller
1647 * (process_client_msg) is holding it. We might want to change that so a
1648 * single command does not lock the entire session list.
1649 */
1650 session = session_find_by_name(name);
1651 if (session != NULL) {
1652 ret = LTTNG_ERR_EXIST_SESS;
1653 goto find_error;
1654 }
1655
1656 /* Create tracing session in the registry */
1657 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
1658 LTTNG_SOCK_GET_GID_CRED(creds));
1659 if (ret != LTTNG_OK) {
1660 goto session_error;
1661 }
1662
1663 /*
1664 * Get the newly created session pointer back
1665 *
1666 * XXX: There is no need for the session lock list here since the caller
1667 * (process_client_msg) is holding it. We might want to change that so a
1668 * single command does not lock the entire session list.
1669 */
1670 session = session_find_by_name(name);
1671 assert(session);
1672
1673 /* Create default consumer output for the session not yet created. */
1674 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1675 if (session->consumer == NULL) {
1676 ret = LTTNG_ERR_FATAL;
1677 goto consumer_error;
1678 }
1679
1680 /*
1681 * This means that the lttng_create_session call was called with the _path_
1682 * argument set to NULL.
1683 */
1684 if (uris == NULL) {
1685 /*
1686 * At this point, we'll skip the consumer URI setup and create a
1687 * session with a NULL path which will flag the session to NOT spawn a
1688 * consumer.
1689 */
1690 DBG("Create session %s with NO uri, skipping consumer setup", name);
1691 goto end;
1692 }
1693
1694 session->start_consumer = 1;
1695
1696 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1697 if (ret != LTTNG_OK) {
1698 goto consumer_error;
1699 }
1700
1701 session->consumer->enabled = 1;
1702
1703 end:
1704 return LTTNG_OK;
1705
1706 consumer_error:
1707 session_destroy(session);
1708 session_error:
1709 find_error:
1710 return ret;
1711 }
1712
1713 /*
1714 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1715 */
1716 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1717 {
1718 int ret;
1719 struct ltt_ust_session *usess;
1720 struct ltt_kernel_session *ksess;
1721
1722 /* Safety net */
1723 assert(session);
1724
1725 usess = session->ust_session;
1726 ksess = session->kernel_session;
1727
1728 /* Clean kernel session teardown */
1729 kernel_destroy_session(ksess);
1730
1731 /* UST session teardown */
1732 if (usess) {
1733 /* Close any relayd session */
1734 consumer_output_send_destroy_relayd(usess->consumer);
1735
1736 /* Destroy every UST application related to this session. */
1737 ret = ust_app_destroy_trace_all(usess);
1738 if (ret) {
1739 ERR("Error in ust_app_destroy_trace_all");
1740 }
1741
1742 /* Clean up the rest. */
1743 trace_ust_destroy_session(usess);
1744 }
1745
1746 /*
1747 * Must notify the kernel thread here to update it's poll set in order to
1748 * remove the channel(s)' fd just destroyed.
1749 */
1750 ret = notify_thread_pipe(wpipe);
1751 if (ret < 0) {
1752 PERROR("write kernel poll pipe");
1753 }
1754
1755 ret = session_destroy(session);
1756
1757 return ret;
1758 }
1759
1760 /*
1761 * Command LTTNG_CALIBRATE processed by the client thread.
1762 */
1763 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1764 {
1765 int ret;
1766
1767 switch (domain) {
1768 case LTTNG_DOMAIN_KERNEL:
1769 {
1770 struct lttng_kernel_calibrate kcalibrate;
1771
1772 kcalibrate.type = calibrate->type;
1773 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1774 if (ret < 0) {
1775 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1776 goto error;
1777 }
1778 break;
1779 }
1780 case LTTNG_DOMAIN_UST:
1781 {
1782 struct lttng_ust_calibrate ucalibrate;
1783
1784 ucalibrate.type = calibrate->type;
1785 ret = ust_app_calibrate_glb(&ucalibrate);
1786 if (ret < 0) {
1787 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1788 goto error;
1789 }
1790 break;
1791 }
1792 default:
1793 ret = LTTNG_ERR_UND;
1794 goto error;
1795 }
1796
1797 ret = LTTNG_OK;
1798
1799 error:
1800 return ret;
1801 }
1802
1803 /*
1804 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1805 */
1806 int cmd_register_consumer(struct ltt_session *session, int domain,
1807 const char *sock_path, struct consumer_data *cdata)
1808 {
1809 int ret, sock;
1810 struct consumer_socket *socket;
1811
1812 assert(session);
1813 assert(cdata);
1814 assert(sock_path);
1815
1816 switch (domain) {
1817 case LTTNG_DOMAIN_KERNEL:
1818 {
1819 struct ltt_kernel_session *ksess = session->kernel_session;
1820
1821 assert(ksess);
1822
1823 /* Can't register a consumer if there is already one */
1824 if (ksess->consumer_fds_sent != 0) {
1825 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1826 goto error;
1827 }
1828
1829 sock = lttcomm_connect_unix_sock(sock_path);
1830 if (sock < 0) {
1831 ret = LTTNG_ERR_CONNECT_FAIL;
1832 goto error;
1833 }
1834
1835 socket = consumer_allocate_socket(sock);
1836 if (socket == NULL) {
1837 ret = LTTNG_ERR_FATAL;
1838 close(sock);
1839 goto error;
1840 }
1841
1842 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1843 if (socket->lock == NULL) {
1844 PERROR("zmalloc pthread mutex");
1845 ret = LTTNG_ERR_FATAL;
1846 goto error;
1847 }
1848 pthread_mutex_init(socket->lock, NULL);
1849 socket->registered = 1;
1850
1851 rcu_read_lock();
1852 consumer_add_socket(socket, ksess->consumer);
1853 rcu_read_unlock();
1854
1855 pthread_mutex_lock(&cdata->pid_mutex);
1856 cdata->pid = -1;
1857 pthread_mutex_unlock(&cdata->pid_mutex);
1858
1859 break;
1860 }
1861 default:
1862 /* TODO: Userspace tracing */
1863 ret = LTTNG_ERR_UND;
1864 goto error;
1865 }
1866
1867 ret = LTTNG_OK;
1868
1869 error:
1870 return ret;
1871 }
1872
1873 /*
1874 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1875 */
1876 ssize_t cmd_list_domains(struct ltt_session *session,
1877 struct lttng_domain **domains)
1878 {
1879 int ret, index = 0;
1880 ssize_t nb_dom = 0;
1881
1882 if (session->kernel_session != NULL) {
1883 DBG3("Listing domains found kernel domain");
1884 nb_dom++;
1885 }
1886
1887 if (session->ust_session != NULL) {
1888 DBG3("Listing domains found UST global domain");
1889 nb_dom++;
1890 }
1891
1892 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1893 if (*domains == NULL) {
1894 ret = LTTNG_ERR_FATAL;
1895 goto error;
1896 }
1897
1898 if (session->kernel_session != NULL) {
1899 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1900 index++;
1901 }
1902
1903 if (session->ust_session != NULL) {
1904 (*domains)[index].type = LTTNG_DOMAIN_UST;
1905 index++;
1906 }
1907
1908 return nb_dom;
1909
1910 error:
1911 /* Return negative value to differentiate return code */
1912 return -ret;
1913 }
1914
1915
1916 /*
1917 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1918 */
1919 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1920 struct lttng_channel **channels)
1921 {
1922 int ret;
1923 ssize_t nb_chan = 0;
1924
1925 switch (domain) {
1926 case LTTNG_DOMAIN_KERNEL:
1927 if (session->kernel_session != NULL) {
1928 nb_chan = session->kernel_session->channel_count;
1929 }
1930 DBG3("Number of kernel channels %zd", nb_chan);
1931 if (nb_chan <= 0) {
1932 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1933 }
1934 break;
1935 case LTTNG_DOMAIN_UST:
1936 if (session->ust_session != NULL) {
1937 nb_chan = lttng_ht_get_count(
1938 session->ust_session->domain_global.channels);
1939 }
1940 DBG3("Number of UST global channels %zd", nb_chan);
1941 if (nb_chan <= 0) {
1942 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1943 }
1944 break;
1945 default:
1946 *channels = NULL;
1947 ret = LTTNG_ERR_UND;
1948 goto error;
1949 }
1950
1951 if (nb_chan > 0) {
1952 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1953 if (*channels == NULL) {
1954 ret = LTTNG_ERR_FATAL;
1955 goto error;
1956 }
1957
1958 list_lttng_channels(domain, session, *channels);
1959 } else {
1960 *channels = NULL;
1961 /* Ret value was set in the domain switch case */
1962 goto error;
1963 }
1964
1965 return nb_chan;
1966
1967 error:
1968 /* Return negative value to differentiate return code */
1969 return -ret;
1970 }
1971
1972 /*
1973 * Command LTTNG_LIST_EVENTS processed by the client thread.
1974 */
1975 ssize_t cmd_list_events(int domain, struct ltt_session *session,
1976 char *channel_name, struct lttng_event **events)
1977 {
1978 int ret = 0;
1979 ssize_t nb_event = 0;
1980
1981 switch (domain) {
1982 case LTTNG_DOMAIN_KERNEL:
1983 if (session->kernel_session != NULL) {
1984 nb_event = list_lttng_kernel_events(channel_name,
1985 session->kernel_session, events);
1986 }
1987 break;
1988 case LTTNG_DOMAIN_UST:
1989 {
1990 if (session->ust_session != NULL) {
1991 nb_event = list_lttng_ust_global_events(channel_name,
1992 &session->ust_session->domain_global, events);
1993 }
1994 break;
1995 }
1996 default:
1997 ret = LTTNG_ERR_UND;
1998 goto error;
1999 }
2000
2001 return nb_event;
2002
2003 error:
2004 /* Return negative value to differentiate return code */
2005 return -ret;
2006 }
2007
2008 /*
2009 * Using the session list, filled a lttng_session array to send back to the
2010 * client for session listing.
2011 *
2012 * The session list lock MUST be acquired before calling this function. Use
2013 * session_lock_list() and session_unlock_list().
2014 */
2015 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2016 gid_t gid)
2017 {
2018 int ret;
2019 unsigned int i = 0;
2020 struct ltt_session *session;
2021 struct ltt_session_list *list = session_get_list();
2022
2023 DBG("Getting all available session for UID %d GID %d",
2024 uid, gid);
2025 /*
2026 * Iterate over session list and append data after the control struct in
2027 * the buffer.
2028 */
2029 cds_list_for_each_entry(session, &list->head, list) {
2030 /*
2031 * Only list the sessions the user can control.
2032 */
2033 if (!session_access_ok(session, uid, gid)) {
2034 continue;
2035 }
2036
2037 struct ltt_kernel_session *ksess = session->kernel_session;
2038 struct ltt_ust_session *usess = session->ust_session;
2039
2040 if (session->consumer->type == CONSUMER_DST_NET ||
2041 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2042 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2043 ret = build_network_session_path(sessions[i].path,
2044 sizeof(session[i].path), session);
2045 } else {
2046 ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
2047 session->consumer->dst.trace_path);
2048 }
2049 if (ret < 0) {
2050 PERROR("snprintf session path");
2051 continue;
2052 }
2053
2054 strncpy(sessions[i].name, session->name, NAME_MAX);
2055 sessions[i].name[NAME_MAX - 1] = '\0';
2056 sessions[i].enabled = session->enabled;
2057 i++;
2058 }
2059 }
2060
2061 /*
2062 * Command LTTNG_DISABLE_CONSUMER processed by the client thread.
2063 */
2064 int cmd_disable_consumer(int domain, struct ltt_session *session)
2065 {
2066 int ret;
2067 struct ltt_kernel_session *ksess = session->kernel_session;
2068 struct ltt_ust_session *usess = session->ust_session;
2069 struct consumer_output *consumer;
2070
2071 assert(session);
2072
2073 if (session->enabled) {
2074 /* Can't disable consumer on an already started session */
2075 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2076 goto error;
2077 }
2078
2079 if (!session->start_consumer) {
2080 ret = LTTNG_ERR_NO_CONSUMER;
2081 goto error;
2082 }
2083
2084 switch (domain) {
2085 case 0:
2086 DBG("Disable tracing session %s consumer", session->name);
2087 consumer = session->consumer;
2088 break;
2089 case LTTNG_DOMAIN_KERNEL:
2090 /* Code flow error if we don't have a kernel session here. */
2091 assert(ksess);
2092
2093 DBG("Disabling kernel consumer");
2094 consumer = ksess->consumer;
2095
2096 break;
2097 case LTTNG_DOMAIN_UST:
2098 /* Code flow error if we don't have a UST session here. */
2099 assert(usess);
2100
2101 DBG("Disabling UST consumer");
2102 consumer = usess->consumer;
2103
2104 break;
2105 default:
2106 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2107 goto error;
2108 }
2109
2110 if (consumer) {
2111 consumer->enabled = 0;
2112 /* Success at this point */
2113 ret = LTTNG_OK;
2114 } else {
2115 ret = LTTNG_ERR_NO_CONSUMER;
2116 }
2117
2118 error:
2119 return ret;
2120 }
2121
2122 /*
2123 * Command LTTNG_ENABLE_CONSUMER processed by the client thread.
2124 */
2125 int cmd_enable_consumer(int domain, struct ltt_session *session)
2126 {
2127 int ret;
2128 struct ltt_kernel_session *ksess = session->kernel_session;
2129 struct ltt_ust_session *usess = session->ust_session;
2130 struct consumer_output *consumer = NULL;
2131
2132 assert(session);
2133
2134 /* Can't enable consumer after session started. */
2135 if (session->enabled) {
2136 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2137 goto error;
2138 }
2139
2140 if (!session->start_consumer) {
2141 ret = LTTNG_ERR_NO_CONSUMER;
2142 goto error;
2143 }
2144
2145 switch (domain) {
2146 case 0:
2147 assert(session->consumer);
2148 consumer = session->consumer;
2149 break;
2150 case LTTNG_DOMAIN_KERNEL:
2151 /* Code flow error if we don't have a kernel session here. */
2152 assert(ksess);
2153
2154 /*
2155 * Check if we have already sent fds to the consumer. In that case,
2156 * the enable-consumer command can't be used because a start trace
2157 * had previously occured.
2158 */
2159 if (ksess->consumer_fds_sent) {
2160 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2161 goto error;
2162 }
2163
2164 consumer = ksess->tmp_consumer;
2165 if (consumer == NULL) {
2166 ret = LTTNG_OK;
2167 /* No temp. consumer output exists. Using the current one. */
2168 DBG3("No temporary consumer. Using default");
2169 consumer = ksess->consumer;
2170 goto error;
2171 }
2172
2173 switch (consumer->type) {
2174 case CONSUMER_DST_LOCAL:
2175 DBG2("Consumer output is local. Creating directory(ies)");
2176
2177 /* Create directory(ies) */
2178 ret = run_as_mkdir_recursive(consumer->dst.trace_path,
2179 S_IRWXU | S_IRWXG, session->uid, session->gid);
2180 if (ret < 0) {
2181 if (ret != -EEXIST) {
2182 ERR("Trace directory creation error");
2183 ret = LTTNG_ERR_FATAL;
2184 goto error;
2185 }
2186 }
2187 break;
2188 case CONSUMER_DST_NET:
2189 DBG2("Consumer output is network. Validating URIs");
2190 /* Validate if we have both control and data path set. */
2191 if (!consumer->dst.net.control_isset) {
2192 ret = LTTNG_ERR_URL_CTRL_MISS;
2193 goto error;
2194 }
2195
2196 if (!consumer->dst.net.data_isset) {
2197 ret = LTTNG_ERR_URL_DATA_MISS;
2198 goto error;
2199 }
2200
2201 /* Check established network session state */
2202 if (session->net_handle == 0) {
2203 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2204 ERR("Session network handle is not set on enable-consumer");
2205 goto error;
2206 }
2207
2208 break;
2209 }
2210
2211 /* Append default kernel trace dir to subdir */
2212 strncat(ksess->consumer->subdir, DEFAULT_KERNEL_TRACE_DIR,
2213 sizeof(ksess->consumer->subdir) -
2214 strlen(ksess->consumer->subdir) - 1);
2215
2216 /*
2217 * @session-lock
2218 * This is race free for now since the session lock is acquired before
2219 * ending up in this function. No other threads can access this kernel
2220 * session without this lock hence freeing the consumer output object
2221 * is valid.
2222 */
2223 rcu_read_lock();
2224 consumer_destroy_output(ksess->consumer);
2225 rcu_read_unlock();
2226 ksess->consumer = consumer;
2227 ksess->tmp_consumer = NULL;
2228
2229 break;
2230 case LTTNG_DOMAIN_UST:
2231 /* Code flow error if we don't have a UST session here. */
2232 assert(usess);
2233
2234 /*
2235 * Check if we have already sent fds to the consumer. In that case,
2236 * the enable-consumer command can't be used because a start trace
2237 * had previously occured.
2238 */
2239 if (usess->start_trace) {
2240 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2241 goto error;
2242 }
2243
2244 consumer = usess->tmp_consumer;
2245 if (consumer == NULL) {
2246 ret = LTTNG_OK;
2247 /* No temp. consumer output exists. Using the current one. */
2248 DBG3("No temporary consumer. Using default");
2249 consumer = usess->consumer;
2250 goto error;
2251 }
2252
2253 switch (consumer->type) {
2254 case CONSUMER_DST_LOCAL:
2255 DBG2("Consumer output is local. Creating directory(ies)");
2256
2257 /* Create directory(ies) */
2258 ret = run_as_mkdir_recursive(consumer->dst.trace_path,
2259 S_IRWXU | S_IRWXG, session->uid, session->gid);
2260 if (ret < 0) {
2261 if (ret != -EEXIST) {
2262 ERR("Trace directory creation error");
2263 ret = LTTNG_ERR_FATAL;
2264 goto error;
2265 }
2266 }
2267 break;
2268 case CONSUMER_DST_NET:
2269 DBG2("Consumer output is network. Validating URIs");
2270 /* Validate if we have both control and data path set. */
2271 if (!consumer->dst.net.control_isset) {
2272 ret = LTTNG_ERR_URL_CTRL_MISS;
2273 goto error;
2274 }
2275
2276 if (!consumer->dst.net.data_isset) {
2277 ret = LTTNG_ERR_URL_DATA_MISS;
2278 goto error;
2279 }
2280
2281 /* Check established network session state */
2282 if (session->net_handle == 0) {
2283 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2284 DBG2("Session network handle is not set on enable-consumer");
2285 goto error;
2286 }
2287
2288 if (consumer->net_seq_index == -1) {
2289 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
2290 DBG2("Network index is not set on the consumer");
2291 goto error;
2292 }
2293
2294 break;
2295 }
2296
2297 /* Append default kernel trace dir to subdir */
2298 strncat(usess->consumer->subdir, DEFAULT_UST_TRACE_DIR,
2299 sizeof(usess->consumer->subdir) -
2300 strlen(usess->consumer->subdir) - 1);
2301
2302 /*
2303 * @session-lock
2304 * This is race free for now since the session lock is acquired before
2305 * ending up in this function. No other threads can access this kernel
2306 * session without this lock hence freeing the consumer output object
2307 * is valid.
2308 */
2309 rcu_read_lock();
2310 consumer_destroy_output(usess->consumer);
2311 rcu_read_unlock();
2312 usess->consumer = consumer;
2313 usess->tmp_consumer = NULL;
2314
2315 break;
2316 }
2317
2318 /* Enable it */
2319 if (consumer) {
2320 consumer->enabled = 1;
2321 /* Success at this point */
2322 ret = LTTNG_OK;
2323 } else {
2324 /* Should not really happend... */
2325 ret = LTTNG_ERR_NO_CONSUMER;
2326 }
2327
2328 error:
2329 return ret;
2330 }
2331
2332 /*
2333 * Init command subsystem.
2334 */
2335 void cmd_init(void)
2336 {
2337 /*
2338 * Set network sequence index to 1 for streams to match a relayd socket on
2339 * the consumer side.
2340 */
2341 uatomic_set(&relayd_net_seq_idx, 1);
2342
2343 DBG("Command subsystem initialized");
2344 }
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