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