Fix: disable JUL event on UST side
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <inttypes.h>
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
23
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
29
30 #include "channel.h"
31 #include "consumer.h"
32 #include "event.h"
33 #include "health-sessiond.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38
39 #include "cmd.h"
40
41 /*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
46 */
47 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48 static uint64_t relayd_net_seq_idx;
49
50 /*
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
53 */
54 static int build_network_session_path(char *dst, size_t size,
55 struct ltt_session *session)
56 {
57 int ret, kdata_port, udata_port;
58 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
59 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
60
61 assert(session);
62 assert(dst);
63
64 memset(tmp_urls, 0, sizeof(tmp_urls));
65 memset(tmp_uurl, 0, sizeof(tmp_uurl));
66
67 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
68
69 if (session->kernel_session && session->kernel_session->consumer) {
70 kuri = &session->kernel_session->consumer->dst.net.control;
71 kdata_port = session->kernel_session->consumer->dst.net.data.port;
72 }
73
74 if (session->ust_session && session->ust_session->consumer) {
75 uuri = &session->ust_session->consumer->dst.net.control;
76 udata_port = session->ust_session->consumer->dst.net.data.port;
77 }
78
79 if (uuri == NULL && kuri == NULL) {
80 uri = &session->consumer->dst.net.control;
81 kdata_port = session->consumer->dst.net.data.port;
82 } else if (kuri && uuri) {
83 ret = uri_compare(kuri, uuri);
84 if (ret) {
85 /* Not Equal */
86 uri = kuri;
87 /* Build uuri URL string */
88 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
89 if (ret < 0) {
90 goto error;
91 }
92 } else {
93 uri = kuri;
94 }
95 } else if (kuri && uuri == NULL) {
96 uri = kuri;
97 } else if (uuri && kuri == NULL) {
98 uri = uuri;
99 }
100
101 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
102 if (ret < 0) {
103 goto error;
104 }
105
106 /*
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 * to print.
109 */
110 if (*tmp_uurl != '\0') {
111 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls, kdata_port, tmp_uurl, udata_port);
113 } else {
114 int dport;
115 if (kuri || (!kuri && !uuri)) {
116 dport = kdata_port;
117 } else {
118 /* No kernel URI, use the UST port. */
119 dport = udata_port;
120 }
121 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
122 }
123
124 error:
125 return ret;
126 }
127
128 /*
129 * Fill lttng_channel array of all channels.
130 */
131 static void list_lttng_channels(int domain, struct ltt_session *session,
132 struct lttng_channel *channels)
133 {
134 int i = 0;
135 struct ltt_kernel_channel *kchan;
136
137 DBG("Listing channels for session %s", session->name);
138
139 switch (domain) {
140 case LTTNG_DOMAIN_KERNEL:
141 /* Kernel channels */
142 if (session->kernel_session != NULL) {
143 cds_list_for_each_entry(kchan,
144 &session->kernel_session->channel_list.head, list) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
147 channels[i].enabled = kchan->enabled;
148 i++;
149 }
150 }
151 break;
152 case LTTNG_DOMAIN_UST:
153 {
154 struct lttng_ht_iter iter;
155 struct ltt_ust_channel *uchan;
156
157 rcu_read_lock();
158 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
159 &iter.iter, uchan, node.node) {
160 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
161 channels[i].attr.overwrite = uchan->attr.overwrite;
162 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
163 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
164 channels[i].attr.switch_timer_interval =
165 uchan->attr.switch_timer_interval;
166 channels[i].attr.read_timer_interval =
167 uchan->attr.read_timer_interval;
168 channels[i].enabled = uchan->enabled;
169 channels[i].attr.tracefile_size = uchan->tracefile_size;
170 channels[i].attr.tracefile_count = uchan->tracefile_count;
171 switch (uchan->attr.output) {
172 case LTTNG_UST_MMAP:
173 default:
174 channels[i].attr.output = LTTNG_EVENT_MMAP;
175 break;
176 }
177 i++;
178 }
179 rcu_read_unlock();
180 break;
181 }
182 default:
183 break;
184 }
185 }
186
187 /*
188 * Create a list of JUL domain events.
189 *
190 * Return number of events in list on success or else a negative value.
191 */
192 static int list_lttng_jul_events(struct jul_domain *dom,
193 struct lttng_event **events)
194 {
195 int i = 0, ret = 0;
196 unsigned int nb_event = 0;
197 struct jul_event *event;
198 struct lttng_event *tmp_events;
199 struct lttng_ht_iter iter;
200
201 assert(dom);
202 assert(events);
203
204 DBG3("Listing JUL events");
205
206 nb_event = lttng_ht_get_count(dom->events);
207 if (nb_event == 0) {
208 ret = nb_event;
209 goto error;
210 }
211
212 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
213 if (!tmp_events) {
214 PERROR("zmalloc JUL events session");
215 ret = -LTTNG_ERR_FATAL;
216 goto error;
217 }
218
219 rcu_read_lock();
220 cds_lfht_for_each_entry(dom->events->ht, &iter.iter, event, node.node) {
221 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
222 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
223 tmp_events[i].enabled = event->enabled;
224 tmp_events[i].loglevel = event->loglevel;
225 tmp_events[i].loglevel_type = event->loglevel_type;
226 i++;
227 }
228 rcu_read_unlock();
229
230 *events = tmp_events;
231 ret = nb_event;
232
233 error:
234 assert(nb_event == i);
235 return ret;
236 }
237
238 /*
239 * Create a list of ust global domain events.
240 */
241 static int list_lttng_ust_global_events(char *channel_name,
242 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
243 {
244 int i = 0, ret = 0;
245 unsigned int nb_event = 0;
246 struct lttng_ht_iter iter;
247 struct lttng_ht_node_str *node;
248 struct ltt_ust_channel *uchan;
249 struct ltt_ust_event *uevent;
250 struct lttng_event *tmp;
251
252 DBG("Listing UST global events for channel %s", channel_name);
253
254 rcu_read_lock();
255
256 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
257 node = lttng_ht_iter_get_node_str(&iter);
258 if (node == NULL) {
259 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
260 goto error;
261 }
262
263 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
264
265 nb_event += lttng_ht_get_count(uchan->events);
266
267 if (nb_event == 0) {
268 ret = nb_event;
269 goto error;
270 }
271
272 DBG3("Listing UST global %d events", nb_event);
273
274 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
275 if (tmp == NULL) {
276 ret = LTTNG_ERR_FATAL;
277 goto error;
278 }
279
280 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
281 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
282 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
283 tmp[i].enabled = uevent->enabled;
284
285 switch (uevent->attr.instrumentation) {
286 case LTTNG_UST_TRACEPOINT:
287 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
288 break;
289 case LTTNG_UST_PROBE:
290 tmp[i].type = LTTNG_EVENT_PROBE;
291 break;
292 case LTTNG_UST_FUNCTION:
293 tmp[i].type = LTTNG_EVENT_FUNCTION;
294 break;
295 }
296
297 tmp[i].loglevel = uevent->attr.loglevel;
298 switch (uevent->attr.loglevel_type) {
299 case LTTNG_UST_LOGLEVEL_ALL:
300 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
301 break;
302 case LTTNG_UST_LOGLEVEL_RANGE:
303 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
304 break;
305 case LTTNG_UST_LOGLEVEL_SINGLE:
306 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
307 break;
308 }
309 if (uevent->filter) {
310 tmp[i].filter = 1;
311 }
312 if (uevent->exclusion) {
313 tmp[i].exclusion = 1;
314 }
315 i++;
316 }
317
318 ret = nb_event;
319 *events = tmp;
320
321 error:
322 rcu_read_unlock();
323 return ret;
324 }
325
326 /*
327 * Fill lttng_event array of all kernel events in the channel.
328 */
329 static int list_lttng_kernel_events(char *channel_name,
330 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
331 {
332 int i = 0, ret;
333 unsigned int nb_event;
334 struct ltt_kernel_event *event;
335 struct ltt_kernel_channel *kchan;
336
337 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
338 if (kchan == NULL) {
339 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
340 goto error;
341 }
342
343 nb_event = kchan->event_count;
344
345 DBG("Listing events for channel %s", kchan->channel->name);
346
347 if (nb_event == 0) {
348 goto end;
349 }
350
351 *events = zmalloc(nb_event * sizeof(struct lttng_event));
352 if (*events == NULL) {
353 ret = LTTNG_ERR_FATAL;
354 goto error;
355 }
356
357 /* Kernel channels */
358 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
359 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
360 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
361 (*events)[i].enabled = event->enabled;
362
363 switch (event->event->instrumentation) {
364 case LTTNG_KERNEL_TRACEPOINT:
365 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
366 break;
367 case LTTNG_KERNEL_KRETPROBE:
368 (*events)[i].type = LTTNG_EVENT_FUNCTION;
369 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
370 sizeof(struct lttng_kernel_kprobe));
371 break;
372 case LTTNG_KERNEL_KPROBE:
373 (*events)[i].type = LTTNG_EVENT_PROBE;
374 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
375 sizeof(struct lttng_kernel_kprobe));
376 break;
377 case LTTNG_KERNEL_FUNCTION:
378 (*events)[i].type = LTTNG_EVENT_FUNCTION;
379 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
380 sizeof(struct lttng_kernel_function));
381 break;
382 case LTTNG_KERNEL_NOOP:
383 (*events)[i].type = LTTNG_EVENT_NOOP;
384 break;
385 case LTTNG_KERNEL_SYSCALL:
386 (*events)[i].type = LTTNG_EVENT_SYSCALL;
387 break;
388 case LTTNG_KERNEL_ALL:
389 assert(0);
390 break;
391 }
392 i++;
393 }
394
395 end:
396 return nb_event;
397
398 error:
399 /* Negate the error code to differentiate the size from an error */
400 return -ret;
401 }
402
403 /*
404 * Add URI so the consumer output object. Set the correct path depending on the
405 * domain adding the default trace directory.
406 */
407 static int add_uri_to_consumer(struct consumer_output *consumer,
408 struct lttng_uri *uri, int domain, const char *session_name)
409 {
410 int ret = LTTNG_OK;
411 const char *default_trace_dir;
412
413 assert(uri);
414
415 if (consumer == NULL) {
416 DBG("No consumer detected. Don't add URI. Stopping.");
417 ret = LTTNG_ERR_NO_CONSUMER;
418 goto error;
419 }
420
421 switch (domain) {
422 case LTTNG_DOMAIN_KERNEL:
423 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
424 break;
425 case LTTNG_DOMAIN_UST:
426 default_trace_dir = DEFAULT_UST_TRACE_DIR;
427 break;
428 default:
429 /*
430 * This case is possible is we try to add the URI to the global tracing
431 * session consumer object which in this case there is no subdir.
432 */
433 default_trace_dir = "";
434 }
435
436 switch (uri->dtype) {
437 case LTTNG_DST_IPV4:
438 case LTTNG_DST_IPV6:
439 DBG2("Setting network URI to consumer");
440
441 if (consumer->type == CONSUMER_DST_NET) {
442 if ((uri->stype == LTTNG_STREAM_CONTROL &&
443 consumer->dst.net.control_isset) ||
444 (uri->stype == LTTNG_STREAM_DATA &&
445 consumer->dst.net.data_isset)) {
446 ret = LTTNG_ERR_URL_EXIST;
447 goto error;
448 }
449 } else {
450 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
451 }
452
453 consumer->type = CONSUMER_DST_NET;
454
455 /* Set URI into consumer output object */
456 ret = consumer_set_network_uri(consumer, uri);
457 if (ret < 0) {
458 ret = -ret;
459 goto error;
460 } else if (ret == 1) {
461 /*
462 * URI was the same in the consumer so we do not append the subdir
463 * again so to not duplicate output dir.
464 */
465 ret = LTTNG_OK;
466 goto error;
467 }
468
469 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
470 ret = consumer_set_subdir(consumer, session_name);
471 if (ret < 0) {
472 ret = LTTNG_ERR_FATAL;
473 goto error;
474 }
475 }
476
477 if (uri->stype == LTTNG_STREAM_CONTROL) {
478 /* On a new subdir, reappend the default trace dir. */
479 strncat(consumer->subdir, default_trace_dir,
480 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
481 DBG3("Append domain trace name to subdir %s", consumer->subdir);
482 }
483
484 break;
485 case LTTNG_DST_PATH:
486 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
487 memset(consumer->dst.trace_path, 0,
488 sizeof(consumer->dst.trace_path));
489 strncpy(consumer->dst.trace_path, uri->dst.path,
490 sizeof(consumer->dst.trace_path));
491 /* Append default trace dir */
492 strncat(consumer->dst.trace_path, default_trace_dir,
493 sizeof(consumer->dst.trace_path) -
494 strlen(consumer->dst.trace_path) - 1);
495 /* Flag consumer as local. */
496 consumer->type = CONSUMER_DST_LOCAL;
497 break;
498 }
499
500 ret = LTTNG_OK;
501
502 error:
503 return ret;
504 }
505
506 /*
507 * Init tracing by creating trace directory and sending fds kernel consumer.
508 */
509 static int init_kernel_tracing(struct ltt_kernel_session *session)
510 {
511 int ret = 0;
512 struct lttng_ht_iter iter;
513 struct consumer_socket *socket;
514
515 assert(session);
516
517 rcu_read_lock();
518
519 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
520 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
521 socket, node.node) {
522 pthread_mutex_lock(socket->lock);
523 ret = kernel_consumer_send_session(socket, session);
524 pthread_mutex_unlock(socket->lock);
525 if (ret < 0) {
526 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
527 goto error;
528 }
529 }
530 }
531
532 error:
533 rcu_read_unlock();
534 return ret;
535 }
536
537 /*
538 * Create a socket to the relayd using the URI.
539 *
540 * On success, the relayd_sock pointer is set to the created socket.
541 * Else, it's stays untouched and a lttcomm error code is returned.
542 */
543 static int create_connect_relayd(struct lttng_uri *uri,
544 struct lttcomm_relayd_sock **relayd_sock)
545 {
546 int ret;
547 struct lttcomm_relayd_sock *rsock;
548
549 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
550 RELAYD_VERSION_COMM_MINOR);
551 if (!rsock) {
552 ret = LTTNG_ERR_FATAL;
553 goto error;
554 }
555
556 /*
557 * Connect to relayd so we can proceed with a session creation. This call
558 * can possibly block for an arbitrary amount of time to set the health
559 * state to be in poll execution.
560 */
561 health_poll_entry();
562 ret = relayd_connect(rsock);
563 health_poll_exit();
564 if (ret < 0) {
565 ERR("Unable to reach lttng-relayd");
566 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
567 goto free_sock;
568 }
569
570 /* Create socket for control stream. */
571 if (uri->stype == LTTNG_STREAM_CONTROL) {
572 DBG3("Creating relayd stream socket from URI");
573
574 /* Check relayd version */
575 ret = relayd_version_check(rsock);
576 if (ret < 0) {
577 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
578 goto close_sock;
579 }
580 } else if (uri->stype == LTTNG_STREAM_DATA) {
581 DBG3("Creating relayd data socket from URI");
582 } else {
583 /* Command is not valid */
584 ERR("Relayd invalid stream type: %d", uri->stype);
585 ret = LTTNG_ERR_INVALID;
586 goto close_sock;
587 }
588
589 *relayd_sock = rsock;
590
591 return LTTNG_OK;
592
593 close_sock:
594 /* The returned value is not useful since we are on an error path. */
595 (void) relayd_close(rsock);
596 free_sock:
597 free(rsock);
598 error:
599 return ret;
600 }
601
602 /*
603 * Connect to the relayd using URI and send the socket to the right consumer.
604 */
605 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
606 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
607 struct consumer_socket *consumer_sock,
608 char *session_name, char *hostname, int session_live_timer)
609 {
610 int ret;
611 struct lttcomm_relayd_sock *rsock = NULL;
612
613 /* Connect to relayd and make version check if uri is the control. */
614 ret = create_connect_relayd(relayd_uri, &rsock);
615 if (ret != LTTNG_OK) {
616 goto error;
617 }
618 assert(rsock);
619
620 /* Set the network sequence index if not set. */
621 if (consumer->net_seq_index == (uint64_t) -1ULL) {
622 pthread_mutex_lock(&relayd_net_seq_idx_lock);
623 /*
624 * Increment net_seq_idx because we are about to transfer the
625 * new relayd socket to the consumer.
626 * Assign unique key so the consumer can match streams.
627 */
628 consumer->net_seq_index = ++relayd_net_seq_idx;
629 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
630 }
631
632 /* Send relayd socket to consumer. */
633 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
634 relayd_uri->stype, session_id,
635 session_name, hostname, session_live_timer);
636 if (ret < 0) {
637 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
638 goto close_sock;
639 }
640
641 /* Flag that the corresponding socket was sent. */
642 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
643 consumer_sock->control_sock_sent = 1;
644 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
645 consumer_sock->data_sock_sent = 1;
646 }
647
648 ret = LTTNG_OK;
649
650 /*
651 * Close socket which was dup on the consumer side. The session daemon does
652 * NOT keep track of the relayd socket(s) once transfer to the consumer.
653 */
654
655 close_sock:
656 (void) relayd_close(rsock);
657 free(rsock);
658
659 error:
660 if (ret != LTTNG_OK) {
661 /*
662 * The consumer output for this session should not be used anymore
663 * since the relayd connection failed thus making any tracing or/and
664 * streaming not usable.
665 */
666 consumer->enabled = 0;
667 }
668 return ret;
669 }
670
671 /*
672 * Send both relayd sockets to a specific consumer and domain. This is a
673 * helper function to facilitate sending the information to the consumer for a
674 * session.
675 */
676 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
677 struct consumer_output *consumer, struct consumer_socket *sock,
678 char *session_name, char *hostname, int session_live_timer)
679 {
680 int ret = LTTNG_OK;
681
682 assert(consumer);
683 assert(sock);
684
685 /* Sending control relayd socket. */
686 if (!sock->control_sock_sent) {
687 ret = send_consumer_relayd_socket(domain, session_id,
688 &consumer->dst.net.control, consumer, sock,
689 session_name, hostname, session_live_timer);
690 if (ret != LTTNG_OK) {
691 goto error;
692 }
693 }
694
695 /* Sending data relayd socket. */
696 if (!sock->data_sock_sent) {
697 ret = send_consumer_relayd_socket(domain, session_id,
698 &consumer->dst.net.data, consumer, sock,
699 session_name, hostname, session_live_timer);
700 if (ret != LTTNG_OK) {
701 goto error;
702 }
703 }
704
705 error:
706 return ret;
707 }
708
709 /*
710 * Setup relayd connections for a tracing session. First creates the socket to
711 * the relayd and send them to the right domain consumer. Consumer type MUST be
712 * network.
713 */
714 int cmd_setup_relayd(struct ltt_session *session)
715 {
716 int ret = LTTNG_OK;
717 struct ltt_ust_session *usess;
718 struct ltt_kernel_session *ksess;
719 struct consumer_socket *socket;
720 struct lttng_ht_iter iter;
721
722 assert(session);
723
724 usess = session->ust_session;
725 ksess = session->kernel_session;
726
727 DBG("Setting relayd for session %s", session->name);
728
729 rcu_read_lock();
730
731 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
732 && usess->consumer->enabled) {
733 /* For each consumer socket, send relayd sockets */
734 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
735 socket, node.node) {
736 pthread_mutex_lock(socket->lock);
737 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
738 usess->consumer, socket,
739 session->name, session->hostname,
740 session->live_timer);
741 pthread_mutex_unlock(socket->lock);
742 if (ret != LTTNG_OK) {
743 goto error;
744 }
745 /* Session is now ready for network streaming. */
746 session->net_handle = 1;
747 }
748 }
749
750 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
751 && ksess->consumer->enabled) {
752 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
753 socket, node.node) {
754 pthread_mutex_lock(socket->lock);
755 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
756 ksess->consumer, socket,
757 session->name, session->hostname,
758 session->live_timer);
759 pthread_mutex_unlock(socket->lock);
760 if (ret != LTTNG_OK) {
761 goto error;
762 }
763 /* Session is now ready for network streaming. */
764 session->net_handle = 1;
765 }
766 }
767
768 error:
769 rcu_read_unlock();
770 return ret;
771 }
772
773 /*
774 * Start a kernel session by opening all necessary streams.
775 */
776 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
777 {
778 int ret;
779 struct ltt_kernel_channel *kchan;
780
781 /* Open kernel metadata */
782 if (ksess->metadata == NULL && ksess->output_traces) {
783 ret = kernel_open_metadata(ksess);
784 if (ret < 0) {
785 ret = LTTNG_ERR_KERN_META_FAIL;
786 goto error;
787 }
788 }
789
790 /* Open kernel metadata stream */
791 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
792 ret = kernel_open_metadata_stream(ksess);
793 if (ret < 0) {
794 ERR("Kernel create metadata stream failed");
795 ret = LTTNG_ERR_KERN_STREAM_FAIL;
796 goto error;
797 }
798 }
799
800 /* For each channel */
801 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
802 if (kchan->stream_count == 0) {
803 ret = kernel_open_channel_stream(kchan);
804 if (ret < 0) {
805 ret = LTTNG_ERR_KERN_STREAM_FAIL;
806 goto error;
807 }
808 /* Update the stream global counter */
809 ksess->stream_count_global += ret;
810 }
811 }
812
813 /* Setup kernel consumer socket and send fds to it */
814 ret = init_kernel_tracing(ksess);
815 if (ret != 0) {
816 ret = LTTNG_ERR_KERN_START_FAIL;
817 goto error;
818 }
819
820 /* This start the kernel tracing */
821 ret = kernel_start_session(ksess);
822 if (ret < 0) {
823 ret = LTTNG_ERR_KERN_START_FAIL;
824 goto error;
825 }
826
827 /* Quiescent wait after starting trace */
828 kernel_wait_quiescent(kernel_tracer_fd);
829
830 ksess->active = 1;
831
832 ret = LTTNG_OK;
833
834 error:
835 return ret;
836 }
837
838 /*
839 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
840 */
841 int cmd_disable_channel(struct ltt_session *session, int domain,
842 char *channel_name)
843 {
844 int ret;
845 struct ltt_ust_session *usess;
846
847 usess = session->ust_session;
848
849 rcu_read_lock();
850
851 switch (domain) {
852 case LTTNG_DOMAIN_KERNEL:
853 {
854 ret = channel_kernel_disable(session->kernel_session,
855 channel_name);
856 if (ret != LTTNG_OK) {
857 goto error;
858 }
859
860 kernel_wait_quiescent(kernel_tracer_fd);
861 break;
862 }
863 case LTTNG_DOMAIN_UST:
864 {
865 struct ltt_ust_channel *uchan;
866 struct lttng_ht *chan_ht;
867
868 chan_ht = usess->domain_global.channels;
869
870 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
871 if (uchan == NULL) {
872 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
873 goto error;
874 }
875
876 ret = channel_ust_disable(usess, uchan);
877 if (ret != LTTNG_OK) {
878 goto error;
879 }
880 break;
881 }
882 #if 0
883 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
884 case LTTNG_DOMAIN_UST_EXEC_NAME:
885 case LTTNG_DOMAIN_UST_PID:
886 #endif
887 default:
888 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
889 goto error;
890 }
891
892 ret = LTTNG_OK;
893
894 error:
895 rcu_read_unlock();
896 return ret;
897 }
898
899 /*
900 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
901 *
902 * The wpipe arguments is used as a notifier for the kernel thread.
903 */
904 int cmd_enable_channel(struct ltt_session *session,
905 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
906 {
907 int ret;
908 struct ltt_ust_session *usess = session->ust_session;
909 struct lttng_ht *chan_ht;
910
911 assert(session);
912 assert(attr);
913 assert(domain);
914
915 DBG("Enabling channel %s for session %s", attr->name, session->name);
916
917 rcu_read_lock();
918
919 /*
920 * Don't try to enable a channel if the session has been started at
921 * some point in time before. The tracer does not allow it.
922 */
923 if (session->has_been_started) {
924 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
925 goto error;
926 }
927
928 /*
929 * If the session is a live session, remove the switch timer, the
930 * live timer does the same thing but sends also synchronisation
931 * beacons for inactive streams.
932 */
933 if (session->live_timer > 0) {
934 attr->attr.live_timer_interval = session->live_timer;
935 attr->attr.switch_timer_interval = 0;
936 }
937
938 /*
939 * The ringbuffer (both in user space and kernel) behave badly in overwrite
940 * mode and with less than 2 subbuf so block it right away and send back an
941 * invalid attribute error.
942 */
943 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
944 ret = LTTNG_ERR_INVALID;
945 goto error;
946 }
947
948 switch (domain->type) {
949 case LTTNG_DOMAIN_KERNEL:
950 {
951 struct ltt_kernel_channel *kchan;
952
953 kchan = trace_kernel_get_channel_by_name(attr->name,
954 session->kernel_session);
955 if (kchan == NULL) {
956 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
957 if (attr->name[0] != '\0') {
958 session->kernel_session->has_non_default_channel = 1;
959 }
960 } else {
961 ret = channel_kernel_enable(session->kernel_session, kchan);
962 }
963
964 if (ret != LTTNG_OK) {
965 goto error;
966 }
967
968 kernel_wait_quiescent(kernel_tracer_fd);
969 break;
970 }
971 case LTTNG_DOMAIN_UST:
972 {
973 struct ltt_ust_channel *uchan;
974
975 chan_ht = usess->domain_global.channels;
976
977 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
978 if (uchan == NULL) {
979 ret = channel_ust_create(usess, attr, domain->buf_type);
980 if (attr->name[0] != '\0') {
981 usess->has_non_default_channel = 1;
982 }
983 } else {
984 ret = channel_ust_enable(usess, uchan);
985 }
986 break;
987 }
988 default:
989 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
990 goto error;
991 }
992
993 error:
994 rcu_read_unlock();
995 return ret;
996 }
997
998
999 /*
1000 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1001 */
1002 int cmd_disable_event(struct ltt_session *session, int domain,
1003 char *channel_name, char *event_name)
1004 {
1005 int ret;
1006
1007 rcu_read_lock();
1008
1009 switch (domain) {
1010 case LTTNG_DOMAIN_KERNEL:
1011 {
1012 struct ltt_kernel_channel *kchan;
1013 struct ltt_kernel_session *ksess;
1014
1015 ksess = session->kernel_session;
1016
1017 /*
1018 * If a non-default channel has been created in the
1019 * session, explicitely require that -c chan_name needs
1020 * to be provided.
1021 */
1022 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1023 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1024 goto error;
1025 }
1026
1027 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1028 if (kchan == NULL) {
1029 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1030 goto error;
1031 }
1032
1033 ret = event_kernel_disable_tracepoint(kchan, event_name);
1034 if (ret != LTTNG_OK) {
1035 goto error;
1036 }
1037
1038 kernel_wait_quiescent(kernel_tracer_fd);
1039 break;
1040 }
1041 case LTTNG_DOMAIN_UST:
1042 {
1043 struct ltt_ust_channel *uchan;
1044 struct ltt_ust_session *usess;
1045
1046 usess = session->ust_session;
1047
1048 /*
1049 * If a non-default channel has been created in the
1050 * session, explicitely require that -c chan_name needs
1051 * to be provided.
1052 */
1053 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1054 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1055 goto error;
1056 }
1057
1058 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1059 channel_name);
1060 if (uchan == NULL) {
1061 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1062 goto error;
1063 }
1064
1065 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1066 if (ret != LTTNG_OK) {
1067 goto error;
1068 }
1069
1070 DBG3("Disable UST event %s in channel %s completed", event_name,
1071 channel_name);
1072 break;
1073 }
1074 case LTTNG_DOMAIN_JUL:
1075 {
1076 struct ltt_ust_session *usess = session->ust_session;
1077
1078 assert(usess);
1079
1080 ret = event_jul_disable(usess, event_name);
1081 if (ret != LTTNG_OK) {
1082 goto error;
1083 }
1084
1085 break;
1086 }
1087 #if 0
1088 case LTTNG_DOMAIN_UST_EXEC_NAME:
1089 case LTTNG_DOMAIN_UST_PID:
1090 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1091 #endif
1092 default:
1093 ret = LTTNG_ERR_UND;
1094 goto error;
1095 }
1096
1097 ret = LTTNG_OK;
1098
1099 error:
1100 rcu_read_unlock();
1101 return ret;
1102 }
1103
1104 /*
1105 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1106 */
1107 int cmd_disable_event_all(struct ltt_session *session, int domain,
1108 char *channel_name)
1109 {
1110 int ret;
1111
1112 rcu_read_lock();
1113
1114 switch (domain) {
1115 case LTTNG_DOMAIN_KERNEL:
1116 {
1117 struct ltt_kernel_session *ksess;
1118 struct ltt_kernel_channel *kchan;
1119
1120 ksess = session->kernel_session;
1121
1122 /*
1123 * If a non-default channel has been created in the
1124 * session, explicitely require that -c chan_name needs
1125 * to be provided.
1126 */
1127 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1128 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1129 goto error;
1130 }
1131
1132 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1133 if (kchan == NULL) {
1134 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1135 goto error;
1136 }
1137
1138 ret = event_kernel_disable_all(kchan);
1139 if (ret != LTTNG_OK) {
1140 goto error;
1141 }
1142
1143 kernel_wait_quiescent(kernel_tracer_fd);
1144 break;
1145 }
1146 case LTTNG_DOMAIN_UST:
1147 {
1148 struct ltt_ust_session *usess;
1149 struct ltt_ust_channel *uchan;
1150
1151 usess = session->ust_session;
1152
1153 /*
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1156 * to be provided.
1157 */
1158 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1159 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1160 goto error;
1161 }
1162
1163 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1164 channel_name);
1165 if (uchan == NULL) {
1166 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1167 goto error;
1168 }
1169
1170 ret = event_ust_disable_all_tracepoints(usess, uchan);
1171 if (ret != 0) {
1172 goto error;
1173 }
1174
1175 DBG3("Disable all UST events in channel %s completed", channel_name);
1176
1177 break;
1178 }
1179 case LTTNG_DOMAIN_JUL:
1180 {
1181 struct ltt_ust_session *usess = session->ust_session;
1182
1183 assert(usess);
1184
1185 ret = event_jul_disable_all(usess);
1186 if (ret != LTTNG_OK) {
1187 goto error;
1188 }
1189
1190 break;
1191 }
1192 #if 0
1193 case LTTNG_DOMAIN_UST_EXEC_NAME:
1194 case LTTNG_DOMAIN_UST_PID:
1195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1196 #endif
1197 default:
1198 ret = LTTNG_ERR_UND;
1199 goto error;
1200 }
1201
1202 ret = LTTNG_OK;
1203
1204 error:
1205 rcu_read_unlock();
1206 return ret;
1207 }
1208
1209 /*
1210 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1211 */
1212 int cmd_add_context(struct ltt_session *session, int domain,
1213 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1214 {
1215 int ret, chan_kern_created = 0, chan_ust_created = 0;
1216
1217 switch (domain) {
1218 case LTTNG_DOMAIN_KERNEL:
1219 assert(session->kernel_session);
1220
1221 if (session->kernel_session->channel_count == 0) {
1222 /* Create default channel */
1223 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1224 if (ret != LTTNG_OK) {
1225 goto error;
1226 }
1227 chan_kern_created = 1;
1228 }
1229 /* Add kernel context to kernel tracer */
1230 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1231 if (ret != LTTNG_OK) {
1232 goto error;
1233 }
1234 break;
1235 case LTTNG_DOMAIN_UST:
1236 {
1237 struct ltt_ust_session *usess = session->ust_session;
1238 unsigned int chan_count;
1239
1240 assert(usess);
1241
1242 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1243 if (chan_count == 0) {
1244 struct lttng_channel *attr;
1245 /* Create default channel */
1246 attr = channel_new_default_attr(domain, usess->buffer_type);
1247 if (attr == NULL) {
1248 ret = LTTNG_ERR_FATAL;
1249 goto error;
1250 }
1251
1252 ret = channel_ust_create(usess, attr, usess->buffer_type);
1253 if (ret != LTTNG_OK) {
1254 free(attr);
1255 goto error;
1256 }
1257 free(attr);
1258 chan_ust_created = 1;
1259 }
1260
1261 ret = context_ust_add(usess, domain, ctx, channel_name);
1262 if (ret != LTTNG_OK) {
1263 goto error;
1264 }
1265 break;
1266 }
1267 #if 0
1268 case LTTNG_DOMAIN_UST_EXEC_NAME:
1269 case LTTNG_DOMAIN_UST_PID:
1270 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1271 #endif
1272 default:
1273 ret = LTTNG_ERR_UND;
1274 goto error;
1275 }
1276
1277 return LTTNG_OK;
1278
1279 error:
1280 if (chan_kern_created) {
1281 struct ltt_kernel_channel *kchan =
1282 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1283 session->kernel_session);
1284 /* Created previously, this should NOT fail. */
1285 assert(kchan);
1286 kernel_destroy_channel(kchan);
1287 }
1288
1289 if (chan_ust_created) {
1290 struct ltt_ust_channel *uchan =
1291 trace_ust_find_channel_by_name(
1292 session->ust_session->domain_global.channels,
1293 DEFAULT_CHANNEL_NAME);
1294 /* Created previously, this should NOT fail. */
1295 assert(uchan);
1296 /* Remove from the channel list of the session. */
1297 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1298 uchan);
1299 trace_ust_destroy_channel(uchan);
1300 }
1301 return ret;
1302 }
1303
1304 /*
1305 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1306 */
1307 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1308 char *channel_name, struct lttng_event *event,
1309 char *filter_expression,
1310 struct lttng_filter_bytecode *filter,
1311 struct lttng_event_exclusion *exclusion,
1312 int wpipe)
1313 {
1314 int ret, channel_created = 0;
1315 struct lttng_channel *attr;
1316
1317 assert(session);
1318 assert(event);
1319 assert(channel_name);
1320
1321 rcu_read_lock();
1322
1323 switch (domain->type) {
1324 case LTTNG_DOMAIN_KERNEL:
1325 {
1326 struct ltt_kernel_channel *kchan;
1327
1328 /*
1329 * If a non-default channel has been created in the
1330 * session, explicitely require that -c chan_name needs
1331 * to be provided.
1332 */
1333 if (session->kernel_session->has_non_default_channel
1334 && channel_name[0] == '\0') {
1335 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1336 goto error;
1337 }
1338
1339 kchan = trace_kernel_get_channel_by_name(channel_name,
1340 session->kernel_session);
1341 if (kchan == NULL) {
1342 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1343 LTTNG_BUFFER_GLOBAL);
1344 if (attr == NULL) {
1345 ret = LTTNG_ERR_FATAL;
1346 goto error;
1347 }
1348 strncpy(attr->name, channel_name, sizeof(attr->name));
1349
1350 ret = cmd_enable_channel(session, domain, attr, wpipe);
1351 if (ret != LTTNG_OK) {
1352 free(attr);
1353 goto error;
1354 }
1355 free(attr);
1356
1357 channel_created = 1;
1358 }
1359
1360 /* Get the newly created kernel channel pointer */
1361 kchan = trace_kernel_get_channel_by_name(channel_name,
1362 session->kernel_session);
1363 if (kchan == NULL) {
1364 /* This sould not happen... */
1365 ret = LTTNG_ERR_FATAL;
1366 goto error;
1367 }
1368
1369 ret = event_kernel_enable_tracepoint(kchan, event);
1370 if (ret != LTTNG_OK) {
1371 if (channel_created) {
1372 /* Let's not leak a useless channel. */
1373 kernel_destroy_channel(kchan);
1374 }
1375 goto error;
1376 }
1377
1378 kernel_wait_quiescent(kernel_tracer_fd);
1379 break;
1380 }
1381 case LTTNG_DOMAIN_UST:
1382 {
1383 struct ltt_ust_channel *uchan;
1384 struct ltt_ust_session *usess = session->ust_session;
1385
1386 assert(usess);
1387
1388 /*
1389 * If a non-default channel has been created in the
1390 * session, explicitely require that -c chan_name needs
1391 * to be provided.
1392 */
1393 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1394 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1395 goto error;
1396 }
1397
1398 /* Get channel from global UST domain */
1399 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1400 channel_name);
1401 if (uchan == NULL) {
1402 /* Create default channel */
1403 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1404 usess->buffer_type);
1405 if (attr == NULL) {
1406 ret = LTTNG_ERR_FATAL;
1407 goto error;
1408 }
1409 strncpy(attr->name, channel_name, sizeof(attr->name));
1410
1411 ret = cmd_enable_channel(session, domain, attr, wpipe);
1412 if (ret != LTTNG_OK) {
1413 free(attr);
1414 goto error;
1415 }
1416 free(attr);
1417
1418 /* Get the newly created channel reference back */
1419 uchan = trace_ust_find_channel_by_name(
1420 usess->domain_global.channels, channel_name);
1421 assert(uchan);
1422 }
1423
1424 /* At this point, the session and channel exist on the tracer */
1425 ret = event_ust_enable_tracepoint(usess, uchan, event,
1426 filter_expression, filter, exclusion);
1427 if (ret != LTTNG_OK) {
1428 goto error;
1429 }
1430 break;
1431 }
1432 case LTTNG_DOMAIN_JUL:
1433 {
1434 struct lttng_event uevent;
1435 struct lttng_domain tmp_dom;
1436 struct ltt_ust_session *usess = session->ust_session;
1437
1438 assert(usess);
1439
1440 /* Create the default JUL tracepoint. */
1441 memset(&uevent, 0, sizeof(uevent));
1442 uevent.type = LTTNG_EVENT_TRACEPOINT;
1443 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1444 if (is_root) {
1445 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1446 sizeof(uevent.name));
1447 } else {
1448 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1449 sizeof(uevent.name));
1450 }
1451 uevent.name[sizeof(uevent.name) - 1] = '\0';
1452
1453 /*
1454 * The domain type is changed because we are about to enable the
1455 * default channel and event for the JUL domain that are hardcoded.
1456 * This happens in the UST domain.
1457 */
1458 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1459 tmp_dom.type = LTTNG_DOMAIN_UST;
1460
1461 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1462 &uevent, filter_expression, filter, NULL, wpipe);
1463 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1464 goto error;
1465 }
1466
1467 /* The wild card * means that everything should be enabled. */
1468 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1469 ret = event_jul_enable_all(usess, event, filter);
1470 } else {
1471 ret = event_jul_enable(usess, event, filter);
1472 }
1473 if (ret != LTTNG_OK) {
1474 goto error;
1475 }
1476
1477 break;
1478 }
1479 #if 0
1480 case LTTNG_DOMAIN_UST_EXEC_NAME:
1481 case LTTNG_DOMAIN_UST_PID:
1482 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1483 #endif
1484 default:
1485 ret = LTTNG_ERR_UND;
1486 goto error;
1487 }
1488
1489 ret = LTTNG_OK;
1490
1491 error:
1492 rcu_read_unlock();
1493 return ret;
1494 }
1495
1496 /*
1497 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1498 */
1499 int cmd_enable_event_all(struct ltt_session *session,
1500 struct lttng_domain *domain, char *channel_name, int event_type,
1501 char *filter_expression,
1502 struct lttng_filter_bytecode *filter, int wpipe)
1503 {
1504 int ret;
1505 struct lttng_channel *attr;
1506
1507 assert(session);
1508 assert(channel_name);
1509
1510 rcu_read_lock();
1511
1512 switch (domain->type) {
1513 case LTTNG_DOMAIN_KERNEL:
1514 {
1515 struct ltt_kernel_channel *kchan;
1516
1517 assert(session->kernel_session);
1518
1519 /*
1520 * If a non-default channel has been created in the
1521 * session, explicitely require that -c chan_name needs
1522 * to be provided.
1523 */
1524 if (session->kernel_session->has_non_default_channel
1525 && channel_name[0] == '\0') {
1526 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1527 goto error;
1528 }
1529
1530 kchan = trace_kernel_get_channel_by_name(channel_name,
1531 session->kernel_session);
1532 if (kchan == NULL) {
1533 /* Create default channel */
1534 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1535 LTTNG_BUFFER_GLOBAL);
1536 if (attr == NULL) {
1537 ret = LTTNG_ERR_FATAL;
1538 goto error;
1539 }
1540 strncpy(attr->name, channel_name, sizeof(attr->name));
1541
1542 ret = cmd_enable_channel(session, domain, attr, wpipe);
1543 if (ret != LTTNG_OK) {
1544 free(attr);
1545 goto error;
1546 }
1547 free(attr);
1548
1549 /* Get the newly created kernel channel pointer */
1550 kchan = trace_kernel_get_channel_by_name(channel_name,
1551 session->kernel_session);
1552 assert(kchan);
1553 }
1554
1555 switch (event_type) {
1556 case LTTNG_EVENT_SYSCALL:
1557 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1558 break;
1559 case LTTNG_EVENT_TRACEPOINT:
1560 /*
1561 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1562 * events already registered to the channel.
1563 */
1564 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1565 break;
1566 case LTTNG_EVENT_ALL:
1567 /* Enable syscalls and tracepoints */
1568 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1569 break;
1570 default:
1571 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1572 goto error;
1573 }
1574
1575 /* Manage return value */
1576 if (ret != LTTNG_OK) {
1577 /*
1578 * On error, cmd_enable_channel call will take care of destroying
1579 * the created channel if it was needed.
1580 */
1581 goto error;
1582 }
1583
1584 kernel_wait_quiescent(kernel_tracer_fd);
1585 break;
1586 }
1587 case LTTNG_DOMAIN_UST:
1588 {
1589 struct ltt_ust_channel *uchan;
1590 struct ltt_ust_session *usess = session->ust_session;
1591
1592 assert(usess);
1593
1594 /*
1595 * If a non-default channel has been created in the
1596 * session, explicitely require that -c chan_name needs
1597 * to be provided.
1598 */
1599 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1600 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1601 goto error;
1602 }
1603
1604 /* Get channel from global UST domain */
1605 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1606 channel_name);
1607 if (uchan == NULL) {
1608 /* Create default channel */
1609 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1610 usess->buffer_type);
1611 if (attr == NULL) {
1612 ret = LTTNG_ERR_FATAL;
1613 goto error;
1614 }
1615 strncpy(attr->name, channel_name, sizeof(attr->name));
1616
1617 ret = cmd_enable_channel(session, domain, attr, wpipe);
1618 if (ret != LTTNG_OK) {
1619 free(attr);
1620 goto error;
1621 }
1622 free(attr);
1623
1624 /* Get the newly created channel reference back */
1625 uchan = trace_ust_find_channel_by_name(
1626 usess->domain_global.channels, channel_name);
1627 assert(uchan);
1628 }
1629
1630 /* At this point, the session and channel exist on the tracer */
1631
1632 switch (event_type) {
1633 case LTTNG_EVENT_ALL:
1634 case LTTNG_EVENT_TRACEPOINT:
1635 ret = event_ust_enable_all_tracepoints(usess, uchan,
1636 filter_expression, filter);
1637 if (ret != LTTNG_OK) {
1638 goto error;
1639 }
1640 break;
1641 default:
1642 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1643 goto error;
1644 }
1645
1646 /* Manage return value */
1647 if (ret != LTTNG_OK) {
1648 goto error;
1649 }
1650
1651 break;
1652 }
1653 case LTTNG_DOMAIN_JUL:
1654 {
1655 struct lttng_event uevent, event;
1656 struct lttng_domain tmp_dom;
1657 struct ltt_ust_session *usess = session->ust_session;
1658
1659 assert(usess);
1660
1661 /* Create the default JUL tracepoint. */
1662 uevent.type = LTTNG_EVENT_TRACEPOINT;
1663 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1664 if (is_root) {
1665 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1666 sizeof(uevent.name));
1667 } else {
1668 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1669 sizeof(uevent.name));
1670 }
1671 uevent.name[sizeof(uevent.name) - 1] = '\0';
1672
1673 /*
1674 * The domain type is changed because we are about to enable the
1675 * default channel and event for the JUL domain that are hardcoded.
1676 * This happens in the UST domain.
1677 */
1678 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1679 tmp_dom.type = LTTNG_DOMAIN_UST;
1680
1681 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1682 &uevent, NULL, NULL, NULL, wpipe);
1683 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1684 goto error;
1685 }
1686
1687 event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1688 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1689 strncpy(event.name, "*", sizeof(event.name));
1690 event.name[sizeof(event.name) - 1] = '\0';
1691
1692 ret = event_jul_enable_all(usess, &event, filter);
1693 if (ret != LTTNG_OK) {
1694 goto error;
1695 }
1696
1697 break;
1698 }
1699 #if 0
1700 case LTTNG_DOMAIN_UST_EXEC_NAME:
1701 case LTTNG_DOMAIN_UST_PID:
1702 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1703 #endif
1704 default:
1705 ret = LTTNG_ERR_UND;
1706 goto error;
1707 }
1708
1709 ret = LTTNG_OK;
1710
1711 error:
1712 rcu_read_unlock();
1713 return ret;
1714 }
1715
1716
1717 /*
1718 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1719 */
1720 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1721 {
1722 int ret;
1723 ssize_t nb_events = 0;
1724
1725 switch (domain) {
1726 case LTTNG_DOMAIN_KERNEL:
1727 nb_events = kernel_list_events(kernel_tracer_fd, events);
1728 if (nb_events < 0) {
1729 ret = LTTNG_ERR_KERN_LIST_FAIL;
1730 goto error;
1731 }
1732 break;
1733 case LTTNG_DOMAIN_UST:
1734 nb_events = ust_app_list_events(events);
1735 if (nb_events < 0) {
1736 ret = LTTNG_ERR_UST_LIST_FAIL;
1737 goto error;
1738 }
1739 break;
1740 case LTTNG_DOMAIN_JUL:
1741 nb_events = jul_list_events(events);
1742 if (nb_events < 0) {
1743 ret = LTTNG_ERR_UST_LIST_FAIL;
1744 goto error;
1745 }
1746 break;
1747 default:
1748 ret = LTTNG_ERR_UND;
1749 goto error;
1750 }
1751
1752 return nb_events;
1753
1754 error:
1755 /* Return negative value to differentiate return code */
1756 return -ret;
1757 }
1758
1759 /*
1760 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1761 */
1762 ssize_t cmd_list_tracepoint_fields(int domain,
1763 struct lttng_event_field **fields)
1764 {
1765 int ret;
1766 ssize_t nb_fields = 0;
1767
1768 switch (domain) {
1769 case LTTNG_DOMAIN_UST:
1770 nb_fields = ust_app_list_event_fields(fields);
1771 if (nb_fields < 0) {
1772 ret = LTTNG_ERR_UST_LIST_FAIL;
1773 goto error;
1774 }
1775 break;
1776 case LTTNG_DOMAIN_KERNEL:
1777 default: /* fall-through */
1778 ret = LTTNG_ERR_UND;
1779 goto error;
1780 }
1781
1782 return nb_fields;
1783
1784 error:
1785 /* Return negative value to differentiate return code */
1786 return -ret;
1787 }
1788
1789 /*
1790 * Command LTTNG_START_TRACE processed by the client thread.
1791 */
1792 int cmd_start_trace(struct ltt_session *session)
1793 {
1794 int ret;
1795 unsigned long nb_chan = 0;
1796 struct ltt_kernel_session *ksession;
1797 struct ltt_ust_session *usess;
1798
1799 assert(session);
1800
1801 /* Ease our life a bit ;) */
1802 ksession = session->kernel_session;
1803 usess = session->ust_session;
1804
1805 /* Is the session already started? */
1806 if (session->active) {
1807 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1808 goto error;
1809 }
1810
1811 /*
1812 * Starting a session without channel is useless since after that it's not
1813 * possible to enable channel thus inform the client.
1814 */
1815 if (usess && usess->domain_global.channels) {
1816 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1817 }
1818 if (ksession) {
1819 nb_chan += ksession->channel_count;
1820 }
1821 if (!nb_chan) {
1822 ret = LTTNG_ERR_NO_CHANNEL;
1823 goto error;
1824 }
1825
1826 /* Kernel tracing */
1827 if (ksession != NULL) {
1828 ret = start_kernel_session(ksession, kernel_tracer_fd);
1829 if (ret != LTTNG_OK) {
1830 goto error;
1831 }
1832 }
1833
1834 /* Flag session that trace should start automatically */
1835 if (usess) {
1836 /*
1837 * Even though the start trace might fail, flag this session active so
1838 * other application coming in are started by default.
1839 */
1840 usess->active = 1;
1841
1842 ret = ust_app_start_trace_all(usess);
1843 if (ret < 0) {
1844 ret = LTTNG_ERR_UST_START_FAIL;
1845 goto error;
1846 }
1847 }
1848
1849 /* Flag this after a successful start. */
1850 session->has_been_started = 1;
1851 session->active = 1;
1852
1853 ret = LTTNG_OK;
1854
1855 error:
1856 return ret;
1857 }
1858
1859 /*
1860 * Command LTTNG_STOP_TRACE processed by the client thread.
1861 */
1862 int cmd_stop_trace(struct ltt_session *session)
1863 {
1864 int ret;
1865 struct ltt_kernel_channel *kchan;
1866 struct ltt_kernel_session *ksession;
1867 struct ltt_ust_session *usess;
1868
1869 assert(session);
1870
1871 /* Short cut */
1872 ksession = session->kernel_session;
1873 usess = session->ust_session;
1874
1875 /* Session is not active. Skip everythong and inform the client. */
1876 if (!session->active) {
1877 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1878 goto error;
1879 }
1880
1881 /* Kernel tracer */
1882 if (ksession && ksession->active) {
1883 DBG("Stop kernel tracing");
1884
1885 /* Flush metadata if exist */
1886 if (ksession->metadata_stream_fd >= 0) {
1887 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1888 if (ret < 0) {
1889 ERR("Kernel metadata flush failed");
1890 }
1891 }
1892
1893 /* Flush all buffers before stopping */
1894 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1895 ret = kernel_flush_buffer(kchan);
1896 if (ret < 0) {
1897 ERR("Kernel flush buffer error");
1898 }
1899 }
1900
1901 ret = kernel_stop_session(ksession);
1902 if (ret < 0) {
1903 ret = LTTNG_ERR_KERN_STOP_FAIL;
1904 goto error;
1905 }
1906
1907 kernel_wait_quiescent(kernel_tracer_fd);
1908
1909 ksession->active = 0;
1910 }
1911
1912 if (usess && usess->active) {
1913 /*
1914 * Even though the stop trace might fail, flag this session inactive so
1915 * other application coming in are not started by default.
1916 */
1917 usess->active = 0;
1918
1919 ret = ust_app_stop_trace_all(usess);
1920 if (ret < 0) {
1921 ret = LTTNG_ERR_UST_STOP_FAIL;
1922 goto error;
1923 }
1924 }
1925
1926 /* Flag inactive after a successful stop. */
1927 session->active = 0;
1928 ret = LTTNG_OK;
1929
1930 error:
1931 return ret;
1932 }
1933
1934 /*
1935 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1936 */
1937 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1938 size_t nb_uri, struct lttng_uri *uris)
1939 {
1940 int ret, i;
1941 struct ltt_kernel_session *ksess = session->kernel_session;
1942 struct ltt_ust_session *usess = session->ust_session;
1943 struct consumer_output *consumer = NULL;
1944
1945 assert(session);
1946 assert(uris);
1947 assert(nb_uri > 0);
1948
1949 /* Can't set consumer URI if the session is active. */
1950 if (session->active) {
1951 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1952 goto error;
1953 }
1954
1955 /*
1956 * This case switch makes sure the domain session has a temporary consumer
1957 * so the URL can be set.
1958 */
1959 switch (domain) {
1960 case 0:
1961 /* Code flow error. A session MUST always have a consumer object */
1962 assert(session->consumer);
1963 /*
1964 * The URL will be added to the tracing session consumer instead of a
1965 * specific domain consumer.
1966 */
1967 consumer = session->consumer;
1968 break;
1969 case LTTNG_DOMAIN_KERNEL:
1970 /* Code flow error if we don't have a kernel session here. */
1971 assert(ksess);
1972 assert(ksess->consumer);
1973 consumer = ksess->consumer;
1974 break;
1975 case LTTNG_DOMAIN_UST:
1976 /* Code flow error if we don't have a kernel session here. */
1977 assert(usess);
1978 assert(usess->consumer);
1979 consumer = usess->consumer;
1980 break;
1981 }
1982
1983 for (i = 0; i < nb_uri; i++) {
1984 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1985 if (ret != LTTNG_OK) {
1986 goto error;
1987 }
1988 }
1989
1990 /*
1991 * Make sure to set the session in output mode after we set URI since a
1992 * session can be created without URL (thus flagged in no output mode).
1993 */
1994 session->output_traces = 1;
1995 if (ksess) {
1996 ksess->output_traces = 1;
1997 } else if (usess) {
1998 usess->output_traces = 1;
1999 }
2000
2001 /* All good! */
2002 ret = LTTNG_OK;
2003
2004 error:
2005 return ret;
2006 }
2007
2008 /*
2009 * Command LTTNG_CREATE_SESSION processed by the client thread.
2010 */
2011 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2012 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2013 {
2014 int ret;
2015 struct ltt_session *session;
2016
2017 assert(name);
2018 assert(creds);
2019
2020 /*
2021 * Verify if the session already exist
2022 *
2023 * XXX: There is no need for the session lock list here since the caller
2024 * (process_client_msg) is holding it. We might want to change that so a
2025 * single command does not lock the entire session list.
2026 */
2027 session = session_find_by_name(name);
2028 if (session != NULL) {
2029 ret = LTTNG_ERR_EXIST_SESS;
2030 goto find_error;
2031 }
2032
2033 /* Create tracing session in the registry */
2034 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2035 LTTNG_SOCK_GET_GID_CRED(creds));
2036 if (ret != LTTNG_OK) {
2037 goto session_error;
2038 }
2039
2040 /*
2041 * Get the newly created session pointer back
2042 *
2043 * XXX: There is no need for the session lock list here since the caller
2044 * (process_client_msg) is holding it. We might want to change that so a
2045 * single command does not lock the entire session list.
2046 */
2047 session = session_find_by_name(name);
2048 assert(session);
2049
2050 session->live_timer = live_timer;
2051 /* Create default consumer output for the session not yet created. */
2052 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2053 if (session->consumer == NULL) {
2054 ret = LTTNG_ERR_FATAL;
2055 goto consumer_error;
2056 }
2057
2058 if (uris) {
2059 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2060 if (ret != LTTNG_OK) {
2061 goto consumer_error;
2062 }
2063 session->output_traces = 1;
2064 } else {
2065 session->output_traces = 0;
2066 DBG2("Session %s created with no output", session->name);
2067 }
2068
2069 session->consumer->enabled = 1;
2070
2071 return LTTNG_OK;
2072
2073 consumer_error:
2074 session_destroy(session);
2075 session_error:
2076 find_error:
2077 return ret;
2078 }
2079
2080 /*
2081 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2082 */
2083 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2084 size_t nb_uri, lttng_sock_cred *creds)
2085 {
2086 int ret;
2087 struct ltt_session *session;
2088 struct snapshot_output *new_output = NULL;
2089
2090 assert(name);
2091 assert(creds);
2092
2093 /*
2094 * Create session in no output mode with URIs set to NULL. The uris we've
2095 * received are for a default snapshot output if one.
2096 */
2097 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2098 if (ret != LTTNG_OK) {
2099 goto error;
2100 }
2101
2102 /* Get the newly created session pointer back. This should NEVER fail. */
2103 session = session_find_by_name(name);
2104 assert(session);
2105
2106 /* Flag session for snapshot mode. */
2107 session->snapshot_mode = 1;
2108
2109 /* Skip snapshot output creation if no URI is given. */
2110 if (nb_uri == 0) {
2111 goto end;
2112 }
2113
2114 new_output = snapshot_output_alloc();
2115 if (!new_output) {
2116 ret = LTTNG_ERR_NOMEM;
2117 goto error_snapshot_alloc;
2118 }
2119
2120 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2121 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2122 if (ret < 0) {
2123 if (ret == -ENOMEM) {
2124 ret = LTTNG_ERR_NOMEM;
2125 } else {
2126 ret = LTTNG_ERR_INVALID;
2127 }
2128 goto error_snapshot;
2129 }
2130
2131 rcu_read_lock();
2132 snapshot_add_output(&session->snapshot, new_output);
2133 rcu_read_unlock();
2134
2135 end:
2136 return LTTNG_OK;
2137
2138 error_snapshot:
2139 snapshot_output_destroy(new_output);
2140 error_snapshot_alloc:
2141 session_destroy(session);
2142 error:
2143 return ret;
2144 }
2145
2146 /*
2147 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2148 */
2149 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2150 {
2151 int ret;
2152 struct ltt_ust_session *usess;
2153 struct ltt_kernel_session *ksess;
2154
2155 /* Safety net */
2156 assert(session);
2157
2158 usess = session->ust_session;
2159 ksess = session->kernel_session;
2160
2161 /* Clean kernel session teardown */
2162 kernel_destroy_session(ksess);
2163
2164 /* UST session teardown */
2165 if (usess) {
2166 /* Close any relayd session */
2167 consumer_output_send_destroy_relayd(usess->consumer);
2168
2169 /* Destroy every UST application related to this session. */
2170 ret = ust_app_destroy_trace_all(usess);
2171 if (ret) {
2172 ERR("Error in ust_app_destroy_trace_all");
2173 }
2174
2175 /* Clean up the rest. */
2176 trace_ust_destroy_session(usess);
2177 }
2178
2179 /*
2180 * Must notify the kernel thread here to update it's poll set in order to
2181 * remove the channel(s)' fd just destroyed.
2182 */
2183 ret = notify_thread_pipe(wpipe);
2184 if (ret < 0) {
2185 PERROR("write kernel poll pipe");
2186 }
2187
2188 ret = session_destroy(session);
2189
2190 return ret;
2191 }
2192
2193 /*
2194 * Command LTTNG_CALIBRATE processed by the client thread.
2195 */
2196 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2197 {
2198 int ret;
2199
2200 switch (domain) {
2201 case LTTNG_DOMAIN_KERNEL:
2202 {
2203 struct lttng_kernel_calibrate kcalibrate;
2204
2205 switch (calibrate->type) {
2206 case LTTNG_CALIBRATE_FUNCTION:
2207 default:
2208 /* Default and only possible calibrate option. */
2209 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2210 break;
2211 }
2212
2213 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2214 if (ret < 0) {
2215 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2216 goto error;
2217 }
2218 break;
2219 }
2220 case LTTNG_DOMAIN_UST:
2221 {
2222 struct lttng_ust_calibrate ucalibrate;
2223
2224 switch (calibrate->type) {
2225 case LTTNG_CALIBRATE_FUNCTION:
2226 default:
2227 /* Default and only possible calibrate option. */
2228 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2229 break;
2230 }
2231
2232 ret = ust_app_calibrate_glb(&ucalibrate);
2233 if (ret < 0) {
2234 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2235 goto error;
2236 }
2237 break;
2238 }
2239 default:
2240 ret = LTTNG_ERR_UND;
2241 goto error;
2242 }
2243
2244 ret = LTTNG_OK;
2245
2246 error:
2247 return ret;
2248 }
2249
2250 /*
2251 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2252 */
2253 int cmd_register_consumer(struct ltt_session *session, int domain,
2254 const char *sock_path, struct consumer_data *cdata)
2255 {
2256 int ret, sock;
2257 struct consumer_socket *socket = NULL;
2258
2259 assert(session);
2260 assert(cdata);
2261 assert(sock_path);
2262
2263 switch (domain) {
2264 case LTTNG_DOMAIN_KERNEL:
2265 {
2266 struct ltt_kernel_session *ksess = session->kernel_session;
2267
2268 assert(ksess);
2269
2270 /* Can't register a consumer if there is already one */
2271 if (ksess->consumer_fds_sent != 0) {
2272 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2273 goto error;
2274 }
2275
2276 sock = lttcomm_connect_unix_sock(sock_path);
2277 if (sock < 0) {
2278 ret = LTTNG_ERR_CONNECT_FAIL;
2279 goto error;
2280 }
2281 cdata->cmd_sock = sock;
2282
2283 socket = consumer_allocate_socket(&cdata->cmd_sock);
2284 if (socket == NULL) {
2285 ret = close(sock);
2286 if (ret < 0) {
2287 PERROR("close register consumer");
2288 }
2289 cdata->cmd_sock = -1;
2290 ret = LTTNG_ERR_FATAL;
2291 goto error;
2292 }
2293
2294 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2295 if (socket->lock == NULL) {
2296 PERROR("zmalloc pthread mutex");
2297 ret = LTTNG_ERR_FATAL;
2298 goto error;
2299 }
2300 pthread_mutex_init(socket->lock, NULL);
2301 socket->registered = 1;
2302
2303 rcu_read_lock();
2304 consumer_add_socket(socket, ksess->consumer);
2305 rcu_read_unlock();
2306
2307 pthread_mutex_lock(&cdata->pid_mutex);
2308 cdata->pid = -1;
2309 pthread_mutex_unlock(&cdata->pid_mutex);
2310
2311 break;
2312 }
2313 default:
2314 /* TODO: Userspace tracing */
2315 ret = LTTNG_ERR_UND;
2316 goto error;
2317 }
2318
2319 return LTTNG_OK;
2320
2321 error:
2322 if (socket) {
2323 consumer_destroy_socket(socket);
2324 }
2325 return ret;
2326 }
2327
2328 /*
2329 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2330 */
2331 ssize_t cmd_list_domains(struct ltt_session *session,
2332 struct lttng_domain **domains)
2333 {
2334 int ret, index = 0;
2335 ssize_t nb_dom = 0;
2336
2337 if (session->kernel_session != NULL) {
2338 DBG3("Listing domains found kernel domain");
2339 nb_dom++;
2340 }
2341
2342 if (session->ust_session != NULL) {
2343 DBG3("Listing domains found UST global domain");
2344 nb_dom++;
2345
2346 if (session->ust_session->domain_jul.being_used) {
2347 nb_dom++;
2348 }
2349 }
2350
2351 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2352 if (*domains == NULL) {
2353 ret = LTTNG_ERR_FATAL;
2354 goto error;
2355 }
2356
2357 if (session->kernel_session != NULL) {
2358 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2359 index++;
2360 }
2361
2362 if (session->ust_session != NULL) {
2363 (*domains)[index].type = LTTNG_DOMAIN_UST;
2364 (*domains)[index].buf_type = session->ust_session->buffer_type;
2365 index++;
2366
2367 if (session->ust_session->domain_jul.being_used) {
2368 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2369 (*domains)[index].buf_type = session->ust_session->buffer_type;
2370 index++;
2371 }
2372 }
2373
2374 return nb_dom;
2375
2376 error:
2377 /* Return negative value to differentiate return code */
2378 return -ret;
2379 }
2380
2381
2382 /*
2383 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2384 */
2385 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2386 struct lttng_channel **channels)
2387 {
2388 int ret;
2389 ssize_t nb_chan = 0;
2390
2391 switch (domain) {
2392 case LTTNG_DOMAIN_KERNEL:
2393 if (session->kernel_session != NULL) {
2394 nb_chan = session->kernel_session->channel_count;
2395 }
2396 DBG3("Number of kernel channels %zd", nb_chan);
2397 if (nb_chan <= 0) {
2398 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2399 }
2400 break;
2401 case LTTNG_DOMAIN_UST:
2402 if (session->ust_session != NULL) {
2403 nb_chan = lttng_ht_get_count(
2404 session->ust_session->domain_global.channels);
2405 }
2406 DBG3("Number of UST global channels %zd", nb_chan);
2407 if (nb_chan <= 0) {
2408 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2409 }
2410 break;
2411 default:
2412 *channels = NULL;
2413 ret = LTTNG_ERR_UND;
2414 goto error;
2415 }
2416
2417 if (nb_chan > 0) {
2418 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2419 if (*channels == NULL) {
2420 ret = LTTNG_ERR_FATAL;
2421 goto error;
2422 }
2423
2424 list_lttng_channels(domain, session, *channels);
2425 } else {
2426 *channels = NULL;
2427 /* Ret value was set in the domain switch case */
2428 goto error;
2429 }
2430
2431 return nb_chan;
2432
2433 error:
2434 /* Return negative value to differentiate return code */
2435 return -ret;
2436 }
2437
2438 /*
2439 * Command LTTNG_LIST_EVENTS processed by the client thread.
2440 */
2441 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2442 char *channel_name, struct lttng_event **events)
2443 {
2444 int ret = 0;
2445 ssize_t nb_event = 0;
2446
2447 switch (domain) {
2448 case LTTNG_DOMAIN_KERNEL:
2449 if (session->kernel_session != NULL) {
2450 nb_event = list_lttng_kernel_events(channel_name,
2451 session->kernel_session, events);
2452 }
2453 break;
2454 case LTTNG_DOMAIN_UST:
2455 {
2456 if (session->ust_session != NULL) {
2457 nb_event = list_lttng_ust_global_events(channel_name,
2458 &session->ust_session->domain_global, events);
2459 }
2460 break;
2461 }
2462 case LTTNG_DOMAIN_JUL:
2463 if (session->ust_session) {
2464 nb_event = list_lttng_jul_events(
2465 &session->ust_session->domain_jul, events);
2466 }
2467 break;
2468 default:
2469 ret = LTTNG_ERR_UND;
2470 goto error;
2471 }
2472
2473 return nb_event;
2474
2475 error:
2476 /* Return negative value to differentiate return code */
2477 return -ret;
2478 }
2479
2480 /*
2481 * Using the session list, filled a lttng_session array to send back to the
2482 * client for session listing.
2483 *
2484 * The session list lock MUST be acquired before calling this function. Use
2485 * session_lock_list() and session_unlock_list().
2486 */
2487 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2488 gid_t gid)
2489 {
2490 int ret;
2491 unsigned int i = 0;
2492 struct ltt_session *session;
2493 struct ltt_session_list *list = session_get_list();
2494
2495 DBG("Getting all available session for UID %d GID %d",
2496 uid, gid);
2497 /*
2498 * Iterate over session list and append data after the control struct in
2499 * the buffer.
2500 */
2501 cds_list_for_each_entry(session, &list->head, list) {
2502 /*
2503 * Only list the sessions the user can control.
2504 */
2505 if (!session_access_ok(session, uid, gid)) {
2506 continue;
2507 }
2508
2509 struct ltt_kernel_session *ksess = session->kernel_session;
2510 struct ltt_ust_session *usess = session->ust_session;
2511
2512 if (session->consumer->type == CONSUMER_DST_NET ||
2513 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2514 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2515 ret = build_network_session_path(sessions[i].path,
2516 sizeof(sessions[i].path), session);
2517 } else {
2518 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2519 session->consumer->dst.trace_path);
2520 }
2521 if (ret < 0) {
2522 PERROR("snprintf session path");
2523 continue;
2524 }
2525
2526 strncpy(sessions[i].name, session->name, NAME_MAX);
2527 sessions[i].name[NAME_MAX - 1] = '\0';
2528 sessions[i].enabled = session->active;
2529 sessions[i].snapshot_mode = session->snapshot_mode;
2530 sessions[i].live_timer_interval = session->live_timer;
2531 i++;
2532 }
2533 }
2534
2535 /*
2536 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2537 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2538 */
2539 int cmd_data_pending(struct ltt_session *session)
2540 {
2541 int ret;
2542 struct ltt_kernel_session *ksess = session->kernel_session;
2543 struct ltt_ust_session *usess = session->ust_session;
2544
2545 assert(session);
2546
2547 /* Session MUST be stopped to ask for data availability. */
2548 if (session->active) {
2549 ret = LTTNG_ERR_SESSION_STARTED;
2550 goto error;
2551 } else {
2552 /*
2553 * If stopped, just make sure we've started before else the above call
2554 * will always send that there is data pending.
2555 *
2556 * The consumer assumes that when the data pending command is received,
2557 * the trace has been started before or else no output data is written
2558 * by the streams which is a condition for data pending. So, this is
2559 * *VERY* important that we don't ask the consumer before a start
2560 * trace.
2561 */
2562 if (!session->has_been_started) {
2563 ret = 0;
2564 goto error;
2565 }
2566 }
2567
2568 if (ksess && ksess->consumer) {
2569 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2570 if (ret == 1) {
2571 /* Data is still being extracted for the kernel. */
2572 goto error;
2573 }
2574 }
2575
2576 if (usess && usess->consumer) {
2577 ret = consumer_is_data_pending(usess->id, usess->consumer);
2578 if (ret == 1) {
2579 /* Data is still being extracted for the kernel. */
2580 goto error;
2581 }
2582 }
2583
2584 /* Data is ready to be read by a viewer */
2585 ret = 0;
2586
2587 error:
2588 return ret;
2589 }
2590
2591 /*
2592 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2593 *
2594 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2595 */
2596 int cmd_snapshot_add_output(struct ltt_session *session,
2597 struct lttng_snapshot_output *output, uint32_t *id)
2598 {
2599 int ret;
2600 struct snapshot_output *new_output;
2601
2602 assert(session);
2603 assert(output);
2604
2605 DBG("Cmd snapshot add output for session %s", session->name);
2606
2607 /*
2608 * Permission denied to create an output if the session is not
2609 * set in no output mode.
2610 */
2611 if (session->output_traces) {
2612 ret = LTTNG_ERR_EPERM;
2613 goto error;
2614 }
2615
2616 /* Only one output is allowed until we have the "tee" feature. */
2617 if (session->snapshot.nb_output == 1) {
2618 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2619 goto error;
2620 }
2621
2622 new_output = snapshot_output_alloc();
2623 if (!new_output) {
2624 ret = LTTNG_ERR_NOMEM;
2625 goto error;
2626 }
2627
2628 ret = snapshot_output_init(output->max_size, output->name,
2629 output->ctrl_url, output->data_url, session->consumer, new_output,
2630 &session->snapshot);
2631 if (ret < 0) {
2632 if (ret == -ENOMEM) {
2633 ret = LTTNG_ERR_NOMEM;
2634 } else {
2635 ret = LTTNG_ERR_INVALID;
2636 }
2637 goto free_error;
2638 }
2639
2640 rcu_read_lock();
2641 snapshot_add_output(&session->snapshot, new_output);
2642 if (id) {
2643 *id = new_output->id;
2644 }
2645 rcu_read_unlock();
2646
2647 return LTTNG_OK;
2648
2649 free_error:
2650 snapshot_output_destroy(new_output);
2651 error:
2652 return ret;
2653 }
2654
2655 /*
2656 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2657 *
2658 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2659 */
2660 int cmd_snapshot_del_output(struct ltt_session *session,
2661 struct lttng_snapshot_output *output)
2662 {
2663 int ret;
2664 struct snapshot_output *sout = NULL;
2665
2666 assert(session);
2667 assert(output);
2668
2669 rcu_read_lock();
2670
2671 /*
2672 * Permission denied to create an output if the session is not
2673 * set in no output mode.
2674 */
2675 if (session->output_traces) {
2676 ret = LTTNG_ERR_EPERM;
2677 goto error;
2678 }
2679
2680 if (output->id) {
2681 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2682 session->name);
2683 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2684 } else if (*output->name != '\0') {
2685 DBG("Cmd snapshot del output name %s for session %s", output->name,
2686 session->name);
2687 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2688 }
2689 if (!sout) {
2690 ret = LTTNG_ERR_INVALID;
2691 goto error;
2692 }
2693
2694 snapshot_delete_output(&session->snapshot, sout);
2695 snapshot_output_destroy(sout);
2696 ret = LTTNG_OK;
2697
2698 error:
2699 rcu_read_unlock();
2700 return ret;
2701 }
2702
2703 /*
2704 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2705 *
2706 * If no output is available, outputs is untouched and 0 is returned.
2707 *
2708 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2709 */
2710 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2711 struct lttng_snapshot_output **outputs)
2712 {
2713 int ret, idx = 0;
2714 struct lttng_snapshot_output *list;
2715 struct lttng_ht_iter iter;
2716 struct snapshot_output *output;
2717
2718 assert(session);
2719 assert(outputs);
2720
2721 DBG("Cmd snapshot list outputs for session %s", session->name);
2722
2723 /*
2724 * Permission denied to create an output if the session is not
2725 * set in no output mode.
2726 */
2727 if (session->output_traces) {
2728 ret = LTTNG_ERR_EPERM;
2729 goto error;
2730 }
2731
2732 if (session->snapshot.nb_output == 0) {
2733 ret = 0;
2734 goto error;
2735 }
2736
2737 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2738 if (!list) {
2739 ret = LTTNG_ERR_NOMEM;
2740 goto error;
2741 }
2742
2743 /* Copy list from session to the new list object. */
2744 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2745 output, node.node) {
2746 assert(output->consumer);
2747 list[idx].id = output->id;
2748 list[idx].max_size = output->max_size;
2749 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2750 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2751 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2752 sizeof(list[idx].ctrl_url));
2753 } else {
2754 /* Control URI. */
2755 ret = uri_to_str_url(&output->consumer->dst.net.control,
2756 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2757 if (ret < 0) {
2758 ret = LTTNG_ERR_NOMEM;
2759 goto free_error;
2760 }
2761
2762 /* Data URI. */
2763 ret = uri_to_str_url(&output->consumer->dst.net.data,
2764 list[idx].data_url, sizeof(list[idx].data_url));
2765 if (ret < 0) {
2766 ret = LTTNG_ERR_NOMEM;
2767 goto free_error;
2768 }
2769 }
2770 idx++;
2771 }
2772
2773 *outputs = list;
2774 return session->snapshot.nb_output;
2775
2776 free_error:
2777 free(list);
2778 error:
2779 return -ret;
2780 }
2781
2782 /*
2783 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2784 * snapshot output is *not* set with a remote destination.
2785 *
2786 * Return 0 on success or a LTTNG_ERR code.
2787 */
2788 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2789 struct snapshot_output *snap_output, struct ltt_session *session)
2790 {
2791 int ret = LTTNG_OK;
2792 struct lttng_ht_iter iter;
2793 struct consumer_socket *socket;
2794
2795 assert(consumer);
2796 assert(snap_output);
2797 assert(session);
2798
2799 DBG2("Set relayd object from snapshot output");
2800
2801 /* Ignore if snapshot consumer output is not network. */
2802 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2803 goto error;
2804 }
2805
2806 /*
2807 * For each consumer socket, create and send the relayd object of the
2808 * snapshot output.
2809 */
2810 rcu_read_lock();
2811 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2812 socket, node.node) {
2813 ret = send_consumer_relayd_sockets(0, session->id,
2814 snap_output->consumer, socket,
2815 session->name, session->hostname,
2816 session->live_timer);
2817 if (ret != LTTNG_OK) {
2818 rcu_read_unlock();
2819 goto error;
2820 }
2821 }
2822 rcu_read_unlock();
2823
2824 error:
2825 return ret;
2826 }
2827
2828 /*
2829 * Record a kernel snapshot.
2830 *
2831 * Return LTTNG_OK on success or a LTTNG_ERR code.
2832 */
2833 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2834 struct snapshot_output *output, struct ltt_session *session,
2835 int wait, int nb_streams)
2836 {
2837 int ret;
2838
2839 assert(ksess);
2840 assert(output);
2841 assert(session);
2842
2843 /* Get the datetime for the snapshot output directory. */
2844 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2845 sizeof(output->datetime));
2846 if (!ret) {
2847 ret = LTTNG_ERR_INVALID;
2848 goto error;
2849 }
2850
2851 /*
2852 * Copy kernel session sockets so we can communicate with the right
2853 * consumer for the snapshot record command.
2854 */
2855 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2856 if (ret < 0) {
2857 ret = LTTNG_ERR_NOMEM;
2858 goto error;
2859 }
2860
2861 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2862 if (ret != LTTNG_OK) {
2863 goto error_snapshot;
2864 }
2865
2866 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2867 if (ret != LTTNG_OK) {
2868 goto error_snapshot;
2869 }
2870
2871 ret = LTTNG_OK;
2872
2873 error_snapshot:
2874 /* Clean up copied sockets so this output can use some other later on. */
2875 consumer_destroy_output_sockets(output->consumer);
2876 error:
2877 return ret;
2878 }
2879
2880 /*
2881 * Record a UST snapshot.
2882 *
2883 * Return 0 on success or a LTTNG_ERR error code.
2884 */
2885 static int record_ust_snapshot(struct ltt_ust_session *usess,
2886 struct snapshot_output *output, struct ltt_session *session,
2887 int wait, int nb_streams)
2888 {
2889 int ret;
2890
2891 assert(usess);
2892 assert(output);
2893 assert(session);
2894
2895 /* Get the datetime for the snapshot output directory. */
2896 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2897 sizeof(output->datetime));
2898 if (!ret) {
2899 ret = LTTNG_ERR_INVALID;
2900 goto error;
2901 }
2902
2903 /*
2904 * Copy UST session sockets so we can communicate with the right
2905 * consumer for the snapshot record command.
2906 */
2907 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2908 if (ret < 0) {
2909 ret = LTTNG_ERR_NOMEM;
2910 goto error;
2911 }
2912
2913 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2914 if (ret != LTTNG_OK) {
2915 goto error_snapshot;
2916 }
2917
2918 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2919 if (ret < 0) {
2920 switch (-ret) {
2921 case EINVAL:
2922 ret = LTTNG_ERR_INVALID;
2923 break;
2924 case ENODATA:
2925 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2926 break;
2927 default:
2928 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2929 break;
2930 }
2931 goto error_snapshot;
2932 }
2933
2934 ret = LTTNG_OK;
2935
2936 error_snapshot:
2937 /* Clean up copied sockets so this output can use some other later on. */
2938 consumer_destroy_output_sockets(output->consumer);
2939 error:
2940 return ret;
2941 }
2942
2943 /*
2944 * Returns the total number of streams for a session or a negative value
2945 * on error.
2946 */
2947 static unsigned int get_total_nb_stream(struct ltt_session *session)
2948 {
2949 unsigned int total_streams = 0;
2950
2951 if (session->kernel_session) {
2952 struct ltt_kernel_session *ksess = session->kernel_session;
2953
2954 total_streams += ksess->stream_count_global;
2955 }
2956
2957 if (session->ust_session) {
2958 struct ltt_ust_session *usess = session->ust_session;
2959
2960 total_streams += ust_app_get_nb_stream(usess);
2961 }
2962
2963 return total_streams;
2964 }
2965
2966 /*
2967 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2968 *
2969 * The wait parameter is ignored so this call always wait for the snapshot to
2970 * complete before returning.
2971 *
2972 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2973 */
2974 int cmd_snapshot_record(struct ltt_session *session,
2975 struct lttng_snapshot_output *output, int wait)
2976 {
2977 int ret = LTTNG_OK;
2978 unsigned int use_tmp_output = 0;
2979 struct snapshot_output tmp_output;
2980 unsigned int nb_streams, snapshot_success = 0;
2981
2982 assert(session);
2983
2984 DBG("Cmd snapshot record for session %s", session->name);
2985
2986 /*
2987 * Permission denied to create an output if the session is not
2988 * set in no output mode.
2989 */
2990 if (session->output_traces) {
2991 ret = LTTNG_ERR_EPERM;
2992 goto error;
2993 }
2994
2995 /* The session needs to be started at least once. */
2996 if (!session->has_been_started) {
2997 ret = LTTNG_ERR_START_SESSION_ONCE;
2998 goto error;
2999 }
3000
3001 /* Use temporary output for the session. */
3002 if (output && *output->ctrl_url != '\0') {
3003 ret = snapshot_output_init(output->max_size, output->name,
3004 output->ctrl_url, output->data_url, session->consumer,
3005 &tmp_output, NULL);
3006 if (ret < 0) {
3007 if (ret == -ENOMEM) {
3008 ret = LTTNG_ERR_NOMEM;
3009 } else {
3010 ret = LTTNG_ERR_INVALID;
3011 }
3012 goto error;
3013 }
3014 /* Use the global session count for the temporary snapshot. */
3015 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3016 use_tmp_output = 1;
3017 }
3018
3019 /*
3020 * Get the total number of stream of that session which is used by the
3021 * maximum size of the snapshot feature.
3022 */
3023 nb_streams = get_total_nb_stream(session);
3024
3025 if (session->kernel_session) {
3026 struct ltt_kernel_session *ksess = session->kernel_session;
3027
3028 if (use_tmp_output) {
3029 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3030 wait, nb_streams);
3031 if (ret != LTTNG_OK) {
3032 goto error;
3033 }
3034 snapshot_success = 1;
3035 } else {
3036 struct snapshot_output *sout;
3037 struct lttng_ht_iter iter;
3038
3039 rcu_read_lock();
3040 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3041 &iter.iter, sout, node.node) {
3042 /*
3043 * Make a local copy of the output and assign the possible
3044 * temporary value given by the caller.
3045 */
3046 memset(&tmp_output, 0, sizeof(tmp_output));
3047 memcpy(&tmp_output, sout, sizeof(tmp_output));
3048
3049 /* Use temporary max size. */
3050 if (output->max_size != (uint64_t) -1ULL) {
3051 tmp_output.max_size = output->max_size;
3052 }
3053
3054 /* Use temporary name. */
3055 if (*output->name != '\0') {
3056 strncpy(tmp_output.name, output->name,
3057 sizeof(tmp_output.name));
3058 }
3059
3060 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3061
3062 ret = record_kernel_snapshot(ksess, &tmp_output,
3063 session, wait, nb_streams);
3064 if (ret != LTTNG_OK) {
3065 rcu_read_unlock();
3066 goto error;
3067 }
3068 snapshot_success = 1;
3069 }
3070 rcu_read_unlock();
3071 }
3072 }
3073
3074 if (session->ust_session) {
3075 struct ltt_ust_session *usess = session->ust_session;
3076
3077 if (use_tmp_output) {
3078 ret = record_ust_snapshot(usess, &tmp_output, session,
3079 wait, nb_streams);
3080 if (ret != LTTNG_OK) {
3081 goto error;
3082 }
3083 snapshot_success = 1;
3084 } else {
3085 struct snapshot_output *sout;
3086 struct lttng_ht_iter iter;
3087
3088 rcu_read_lock();
3089 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3090 &iter.iter, sout, node.node) {
3091 /*
3092 * Make a local copy of the output and assign the possible
3093 * temporary value given by the caller.
3094 */
3095 memset(&tmp_output, 0, sizeof(tmp_output));
3096 memcpy(&tmp_output, sout, sizeof(tmp_output));
3097
3098 /* Use temporary max size. */
3099 if (output->max_size != (uint64_t) -1ULL) {
3100 tmp_output.max_size = output->max_size;
3101 }
3102
3103 /* Use temporary name. */
3104 if (*output->name != '\0') {
3105 strncpy(tmp_output.name, output->name,
3106 sizeof(tmp_output.name));
3107 }
3108
3109 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3110
3111 ret = record_ust_snapshot(usess, &tmp_output, session,
3112 wait, nb_streams);
3113 if (ret != LTTNG_OK) {
3114 rcu_read_unlock();
3115 goto error;
3116 }
3117 snapshot_success = 1;
3118 }
3119 rcu_read_unlock();
3120 }
3121 }
3122
3123 if (snapshot_success) {
3124 session->snapshot.nb_snapshot++;
3125 } else {
3126 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3127 }
3128
3129 error:
3130 return ret;
3131 }
3132
3133 /*
3134 * Init command subsystem.
3135 */
3136 void cmd_init(void)
3137 {
3138 /*
3139 * Set network sequence index to 1 for streams to match a relayd
3140 * socket on the consumer side.
3141 */
3142 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3143 relayd_net_seq_idx = 1;
3144 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3145
3146 DBG("Command subsystem initialized");
3147 }
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