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