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Fix: don't ask data pending if session was not started
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <inttypes.h>
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
23
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
29
30 #include "channel.h"
31 #include "consumer.h"
32 #include "event.h"
33 #include "health-sessiond.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38
39 #include "cmd.h"
40
41 /*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
46 */
47 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48 static uint64_t relayd_net_seq_idx;
49
50 /*
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
53 */
54 static int build_network_session_path(char *dst, size_t size,
55 struct ltt_session *session)
56 {
57 int ret, kdata_port, udata_port;
58 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
59 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
60
61 assert(session);
62 assert(dst);
63
64 memset(tmp_urls, 0, sizeof(tmp_urls));
65 memset(tmp_uurl, 0, sizeof(tmp_uurl));
66
67 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
68
69 if (session->kernel_session && session->kernel_session->consumer) {
70 kuri = &session->kernel_session->consumer->dst.net.control;
71 kdata_port = session->kernel_session->consumer->dst.net.data.port;
72 }
73
74 if (session->ust_session && session->ust_session->consumer) {
75 uuri = &session->ust_session->consumer->dst.net.control;
76 udata_port = session->ust_session->consumer->dst.net.data.port;
77 }
78
79 if (uuri == NULL && kuri == NULL) {
80 uri = &session->consumer->dst.net.control;
81 kdata_port = session->consumer->dst.net.data.port;
82 } else if (kuri && uuri) {
83 ret = uri_compare(kuri, uuri);
84 if (ret) {
85 /* Not Equal */
86 uri = kuri;
87 /* Build uuri URL string */
88 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
89 if (ret < 0) {
90 goto error;
91 }
92 } else {
93 uri = kuri;
94 }
95 } else if (kuri && uuri == NULL) {
96 uri = kuri;
97 } else if (uuri && kuri == NULL) {
98 uri = uuri;
99 }
100
101 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
102 if (ret < 0) {
103 goto error;
104 }
105
106 /*
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 * to print.
109 */
110 if (*tmp_uurl != '\0') {
111 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls, kdata_port, tmp_uurl, udata_port);
113 } else {
114 int dport;
115 if (kuri || (!kuri && !uuri)) {
116 dport = kdata_port;
117 } else {
118 /* No kernel URI, use the UST port. */
119 dport = udata_port;
120 }
121 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
122 }
123
124 error:
125 return ret;
126 }
127
128 /*
129 * Fill lttng_channel array of all channels.
130 */
131 static void list_lttng_channels(int domain, struct ltt_session *session,
132 struct lttng_channel *channels)
133 {
134 int i = 0;
135 struct ltt_kernel_channel *kchan;
136
137 DBG("Listing channels for session %s", session->name);
138
139 switch (domain) {
140 case LTTNG_DOMAIN_KERNEL:
141 /* Kernel channels */
142 if (session->kernel_session != NULL) {
143 cds_list_for_each_entry(kchan,
144 &session->kernel_session->channel_list.head, list) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
147 channels[i].enabled = kchan->enabled;
148 i++;
149 }
150 }
151 break;
152 case LTTNG_DOMAIN_UST:
153 {
154 struct lttng_ht_iter iter;
155 struct ltt_ust_channel *uchan;
156
157 rcu_read_lock();
158 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
159 &iter.iter, uchan, node.node) {
160 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
161 channels[i].attr.overwrite = uchan->attr.overwrite;
162 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
163 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
164 channels[i].attr.switch_timer_interval =
165 uchan->attr.switch_timer_interval;
166 channels[i].attr.read_timer_interval =
167 uchan->attr.read_timer_interval;
168 channels[i].enabled = uchan->enabled;
169 switch (uchan->attr.output) {
170 case LTTNG_UST_MMAP:
171 default:
172 channels[i].attr.output = LTTNG_EVENT_MMAP;
173 break;
174 }
175 i++;
176 }
177 rcu_read_unlock();
178 break;
179 }
180 default:
181 break;
182 }
183 }
184
185 /*
186 * Create a list of JUL domain events.
187 *
188 * Return number of events in list on success or else a negative value.
189 */
190 static int list_lttng_jul_events(struct jul_domain *dom,
191 struct lttng_event **events)
192 {
193 int i = 0, ret = 0;
194 unsigned int nb_event = 0;
195 struct jul_event *event;
196 struct lttng_event *tmp_events;
197 struct lttng_ht_iter iter;
198
199 assert(dom);
200 assert(events);
201
202 DBG3("Listing JUL events");
203
204 nb_event = lttng_ht_get_count(dom->events);
205 if (nb_event == 0) {
206 ret = nb_event;
207 goto error;
208 }
209
210 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
211 if (!tmp_events) {
212 PERROR("zmalloc JUL events session");
213 ret = -LTTNG_ERR_FATAL;
214 goto error;
215 }
216
217 rcu_read_lock();
218 cds_lfht_for_each_entry(dom->events->ht, &iter.iter, event, node.node) {
219 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
220 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
221 tmp_events[i].enabled = event->enabled;
222 i++;
223 }
224 rcu_read_unlock();
225
226 *events = tmp_events;
227 ret = nb_event;
228
229 error:
230 assert(nb_event == i);
231 return ret;
232 }
233
234 /*
235 * Create a list of ust global domain events.
236 */
237 static int list_lttng_ust_global_events(char *channel_name,
238 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
239 {
240 int i = 0, ret = 0;
241 unsigned int nb_event = 0;
242 struct lttng_ht_iter iter;
243 struct lttng_ht_node_str *node;
244 struct ltt_ust_channel *uchan;
245 struct ltt_ust_event *uevent;
246 struct lttng_event *tmp;
247
248 DBG("Listing UST global events for channel %s", channel_name);
249
250 rcu_read_lock();
251
252 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
253 node = lttng_ht_iter_get_node_str(&iter);
254 if (node == NULL) {
255 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
256 goto error;
257 }
258
259 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
260
261 nb_event += lttng_ht_get_count(uchan->events);
262
263 if (nb_event == 0) {
264 ret = nb_event;
265 goto error;
266 }
267
268 DBG3("Listing UST global %d events", nb_event);
269
270 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
271 if (tmp == NULL) {
272 ret = LTTNG_ERR_FATAL;
273 goto error;
274 }
275
276 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
277 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
278 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
279 tmp[i].enabled = uevent->enabled;
280
281 switch (uevent->attr.instrumentation) {
282 case LTTNG_UST_TRACEPOINT:
283 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
284 break;
285 case LTTNG_UST_PROBE:
286 tmp[i].type = LTTNG_EVENT_PROBE;
287 break;
288 case LTTNG_UST_FUNCTION:
289 tmp[i].type = LTTNG_EVENT_FUNCTION;
290 break;
291 }
292
293 tmp[i].loglevel = uevent->attr.loglevel;
294 switch (uevent->attr.loglevel_type) {
295 case LTTNG_UST_LOGLEVEL_ALL:
296 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
297 break;
298 case LTTNG_UST_LOGLEVEL_RANGE:
299 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
300 break;
301 case LTTNG_UST_LOGLEVEL_SINGLE:
302 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
303 break;
304 }
305 if (uevent->filter) {
306 tmp[i].filter = 1;
307 }
308 if (uevent->exclusion) {
309 tmp[i].exclusion = 1;
310 }
311 i++;
312 }
313
314 ret = nb_event;
315 *events = tmp;
316
317 error:
318 rcu_read_unlock();
319 return ret;
320 }
321
322 /*
323 * Fill lttng_event array of all kernel events in the channel.
324 */
325 static int list_lttng_kernel_events(char *channel_name,
326 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
327 {
328 int i = 0, ret;
329 unsigned int nb_event;
330 struct ltt_kernel_event *event;
331 struct ltt_kernel_channel *kchan;
332
333 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
334 if (kchan == NULL) {
335 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
336 goto error;
337 }
338
339 nb_event = kchan->event_count;
340
341 DBG("Listing events for channel %s", kchan->channel->name);
342
343 if (nb_event == 0) {
344 goto end;
345 }
346
347 *events = zmalloc(nb_event * sizeof(struct lttng_event));
348 if (*events == NULL) {
349 ret = LTTNG_ERR_FATAL;
350 goto error;
351 }
352
353 /* Kernel channels */
354 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
355 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
356 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
357 (*events)[i].enabled = event->enabled;
358
359 switch (event->event->instrumentation) {
360 case LTTNG_KERNEL_TRACEPOINT:
361 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
362 break;
363 case LTTNG_KERNEL_KRETPROBE:
364 (*events)[i].type = LTTNG_EVENT_FUNCTION;
365 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
366 sizeof(struct lttng_kernel_kprobe));
367 break;
368 case LTTNG_KERNEL_KPROBE:
369 (*events)[i].type = LTTNG_EVENT_PROBE;
370 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
371 sizeof(struct lttng_kernel_kprobe));
372 break;
373 case LTTNG_KERNEL_FUNCTION:
374 (*events)[i].type = LTTNG_EVENT_FUNCTION;
375 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
376 sizeof(struct lttng_kernel_function));
377 break;
378 case LTTNG_KERNEL_NOOP:
379 (*events)[i].type = LTTNG_EVENT_NOOP;
380 break;
381 case LTTNG_KERNEL_SYSCALL:
382 (*events)[i].type = LTTNG_EVENT_SYSCALL;
383 break;
384 case LTTNG_KERNEL_ALL:
385 assert(0);
386 break;
387 }
388 i++;
389 }
390
391 end:
392 return nb_event;
393
394 error:
395 /* Negate the error code to differentiate the size from an error */
396 return -ret;
397 }
398
399 /*
400 * Add URI so the consumer output object. Set the correct path depending on the
401 * domain adding the default trace directory.
402 */
403 static int add_uri_to_consumer(struct consumer_output *consumer,
404 struct lttng_uri *uri, int domain, const char *session_name)
405 {
406 int ret = LTTNG_OK;
407 const char *default_trace_dir;
408
409 assert(uri);
410
411 if (consumer == NULL) {
412 DBG("No consumer detected. Don't add URI. Stopping.");
413 ret = LTTNG_ERR_NO_CONSUMER;
414 goto error;
415 }
416
417 switch (domain) {
418 case LTTNG_DOMAIN_KERNEL:
419 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
420 break;
421 case LTTNG_DOMAIN_UST:
422 default_trace_dir = DEFAULT_UST_TRACE_DIR;
423 break;
424 default:
425 /*
426 * This case is possible is we try to add the URI to the global tracing
427 * session consumer object which in this case there is no subdir.
428 */
429 default_trace_dir = "";
430 }
431
432 switch (uri->dtype) {
433 case LTTNG_DST_IPV4:
434 case LTTNG_DST_IPV6:
435 DBG2("Setting network URI to consumer");
436
437 if (consumer->type == CONSUMER_DST_NET) {
438 if ((uri->stype == LTTNG_STREAM_CONTROL &&
439 consumer->dst.net.control_isset) ||
440 (uri->stype == LTTNG_STREAM_DATA &&
441 consumer->dst.net.data_isset)) {
442 ret = LTTNG_ERR_URL_EXIST;
443 goto error;
444 }
445 } else {
446 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
447 }
448
449 consumer->type = CONSUMER_DST_NET;
450
451 /* Set URI into consumer output object */
452 ret = consumer_set_network_uri(consumer, uri);
453 if (ret < 0) {
454 ret = -ret;
455 goto error;
456 } else if (ret == 1) {
457 /*
458 * URI was the same in the consumer so we do not append the subdir
459 * again so to not duplicate output dir.
460 */
461 ret = LTTNG_OK;
462 goto error;
463 }
464
465 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
466 ret = consumer_set_subdir(consumer, session_name);
467 if (ret < 0) {
468 ret = LTTNG_ERR_FATAL;
469 goto error;
470 }
471 }
472
473 if (uri->stype == LTTNG_STREAM_CONTROL) {
474 /* On a new subdir, reappend the default trace dir. */
475 strncat(consumer->subdir, default_trace_dir,
476 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
477 DBG3("Append domain trace name to subdir %s", consumer->subdir);
478 }
479
480 break;
481 case LTTNG_DST_PATH:
482 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
483 memset(consumer->dst.trace_path, 0,
484 sizeof(consumer->dst.trace_path));
485 strncpy(consumer->dst.trace_path, uri->dst.path,
486 sizeof(consumer->dst.trace_path));
487 /* Append default trace dir */
488 strncat(consumer->dst.trace_path, default_trace_dir,
489 sizeof(consumer->dst.trace_path) -
490 strlen(consumer->dst.trace_path) - 1);
491 /* Flag consumer as local. */
492 consumer->type = CONSUMER_DST_LOCAL;
493 break;
494 }
495
496 ret = LTTNG_OK;
497
498 error:
499 return ret;
500 }
501
502 /*
503 * Init tracing by creating trace directory and sending fds kernel consumer.
504 */
505 static int init_kernel_tracing(struct ltt_kernel_session *session)
506 {
507 int ret = 0;
508 struct lttng_ht_iter iter;
509 struct consumer_socket *socket;
510
511 assert(session);
512
513 rcu_read_lock();
514
515 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
516 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
517 socket, node.node) {
518 pthread_mutex_lock(socket->lock);
519 ret = kernel_consumer_send_session(socket, session);
520 pthread_mutex_unlock(socket->lock);
521 if (ret < 0) {
522 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
523 goto error;
524 }
525 }
526 }
527
528 error:
529 rcu_read_unlock();
530 return ret;
531 }
532
533 /*
534 * Create a socket to the relayd using the URI.
535 *
536 * On success, the relayd_sock pointer is set to the created socket.
537 * Else, it's stays untouched and a lttcomm error code is returned.
538 */
539 static int create_connect_relayd(struct lttng_uri *uri,
540 struct lttcomm_relayd_sock **relayd_sock)
541 {
542 int ret;
543 struct lttcomm_relayd_sock *rsock;
544
545 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
546 RELAYD_VERSION_COMM_MINOR);
547 if (!rsock) {
548 ret = LTTNG_ERR_FATAL;
549 goto error;
550 }
551
552 /*
553 * Connect to relayd so we can proceed with a session creation. This call
554 * can possibly block for an arbitrary amount of time to set the health
555 * state to be in poll execution.
556 */
557 health_poll_entry();
558 ret = relayd_connect(rsock);
559 health_poll_exit();
560 if (ret < 0) {
561 ERR("Unable to reach lttng-relayd");
562 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
563 goto free_sock;
564 }
565
566 /* Create socket for control stream. */
567 if (uri->stype == LTTNG_STREAM_CONTROL) {
568 DBG3("Creating relayd stream socket from URI");
569
570 /* Check relayd version */
571 ret = relayd_version_check(rsock);
572 if (ret < 0) {
573 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
574 goto close_sock;
575 }
576 } else if (uri->stype == LTTNG_STREAM_DATA) {
577 DBG3("Creating relayd data socket from URI");
578 } else {
579 /* Command is not valid */
580 ERR("Relayd invalid stream type: %d", uri->stype);
581 ret = LTTNG_ERR_INVALID;
582 goto close_sock;
583 }
584
585 *relayd_sock = rsock;
586
587 return LTTNG_OK;
588
589 close_sock:
590 /* The returned value is not useful since we are on an error path. */
591 (void) relayd_close(rsock);
592 free_sock:
593 free(rsock);
594 error:
595 return ret;
596 }
597
598 /*
599 * Connect to the relayd using URI and send the socket to the right consumer.
600 */
601 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
602 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
603 struct consumer_socket *consumer_sock,
604 char *session_name, char *hostname, int session_live_timer)
605 {
606 int ret;
607 struct lttcomm_relayd_sock *rsock = NULL;
608
609 /* Connect to relayd and make version check if uri is the control. */
610 ret = create_connect_relayd(relayd_uri, &rsock);
611 if (ret != LTTNG_OK) {
612 goto error;
613 }
614 assert(rsock);
615
616 /* Set the network sequence index if not set. */
617 if (consumer->net_seq_index == (uint64_t) -1ULL) {
618 pthread_mutex_lock(&relayd_net_seq_idx_lock);
619 /*
620 * Increment net_seq_idx because we are about to transfer the
621 * new relayd socket to the consumer.
622 * Assign unique key so the consumer can match streams.
623 */
624 consumer->net_seq_index = ++relayd_net_seq_idx;
625 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
626 }
627
628 /* Send relayd socket to consumer. */
629 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
630 relayd_uri->stype, session_id,
631 session_name, hostname, session_live_timer);
632 if (ret < 0) {
633 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
634 goto close_sock;
635 }
636
637 /* Flag that the corresponding socket was sent. */
638 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
639 consumer_sock->control_sock_sent = 1;
640 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
641 consumer_sock->data_sock_sent = 1;
642 }
643
644 ret = LTTNG_OK;
645
646 /*
647 * Close socket which was dup on the consumer side. The session daemon does
648 * NOT keep track of the relayd socket(s) once transfer to the consumer.
649 */
650
651 close_sock:
652 (void) relayd_close(rsock);
653 free(rsock);
654
655 error:
656 if (ret != LTTNG_OK) {
657 /*
658 * The consumer output for this session should not be used anymore
659 * since the relayd connection failed thus making any tracing or/and
660 * streaming not usable.
661 */
662 consumer->enabled = 0;
663 }
664 return ret;
665 }
666
667 /*
668 * Send both relayd sockets to a specific consumer and domain. This is a
669 * helper function to facilitate sending the information to the consumer for a
670 * session.
671 */
672 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
673 struct consumer_output *consumer, struct consumer_socket *sock,
674 char *session_name, char *hostname, int session_live_timer)
675 {
676 int ret = LTTNG_OK;
677
678 assert(consumer);
679 assert(sock);
680
681 /* Sending control relayd socket. */
682 if (!sock->control_sock_sent) {
683 ret = send_consumer_relayd_socket(domain, session_id,
684 &consumer->dst.net.control, consumer, sock,
685 session_name, hostname, session_live_timer);
686 if (ret != LTTNG_OK) {
687 goto error;
688 }
689 }
690
691 /* Sending data relayd socket. */
692 if (!sock->data_sock_sent) {
693 ret = send_consumer_relayd_socket(domain, session_id,
694 &consumer->dst.net.data, consumer, sock,
695 session_name, hostname, session_live_timer);
696 if (ret != LTTNG_OK) {
697 goto error;
698 }
699 }
700
701 error:
702 return ret;
703 }
704
705 /*
706 * Setup relayd connections for a tracing session. First creates the socket to
707 * the relayd and send them to the right domain consumer. Consumer type MUST be
708 * network.
709 */
710 int cmd_setup_relayd(struct ltt_session *session)
711 {
712 int ret = LTTNG_OK;
713 struct ltt_ust_session *usess;
714 struct ltt_kernel_session *ksess;
715 struct consumer_socket *socket;
716 struct lttng_ht_iter iter;
717
718 assert(session);
719
720 usess = session->ust_session;
721 ksess = session->kernel_session;
722
723 DBG("Setting relayd for session %s", session->name);
724
725 rcu_read_lock();
726
727 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
728 && usess->consumer->enabled) {
729 /* For each consumer socket, send relayd sockets */
730 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
731 socket, node.node) {
732 pthread_mutex_lock(socket->lock);
733 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
734 usess->consumer, socket,
735 session->name, session->hostname,
736 session->live_timer);
737 pthread_mutex_unlock(socket->lock);
738 if (ret != LTTNG_OK) {
739 goto error;
740 }
741 /* Session is now ready for network streaming. */
742 session->net_handle = 1;
743 }
744 }
745
746 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
747 && ksess->consumer->enabled) {
748 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
749 socket, node.node) {
750 pthread_mutex_lock(socket->lock);
751 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
752 ksess->consumer, socket,
753 session->name, session->hostname,
754 session->live_timer);
755 pthread_mutex_unlock(socket->lock);
756 if (ret != LTTNG_OK) {
757 goto error;
758 }
759 /* Session is now ready for network streaming. */
760 session->net_handle = 1;
761 }
762 }
763
764 error:
765 rcu_read_unlock();
766 return ret;
767 }
768
769 /*
770 * Start a kernel session by opening all necessary streams.
771 */
772 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
773 {
774 int ret;
775 struct ltt_kernel_channel *kchan;
776
777 /* Open kernel metadata */
778 if (ksess->metadata == NULL && ksess->output_traces) {
779 ret = kernel_open_metadata(ksess);
780 if (ret < 0) {
781 ret = LTTNG_ERR_KERN_META_FAIL;
782 goto error;
783 }
784 }
785
786 /* Open kernel metadata stream */
787 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
788 ret = kernel_open_metadata_stream(ksess);
789 if (ret < 0) {
790 ERR("Kernel create metadata stream failed");
791 ret = LTTNG_ERR_KERN_STREAM_FAIL;
792 goto error;
793 }
794 }
795
796 /* For each channel */
797 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
798 if (kchan->stream_count == 0) {
799 ret = kernel_open_channel_stream(kchan);
800 if (ret < 0) {
801 ret = LTTNG_ERR_KERN_STREAM_FAIL;
802 goto error;
803 }
804 /* Update the stream global counter */
805 ksess->stream_count_global += ret;
806 }
807 }
808
809 /* Setup kernel consumer socket and send fds to it */
810 ret = init_kernel_tracing(ksess);
811 if (ret != 0) {
812 ret = LTTNG_ERR_KERN_START_FAIL;
813 goto error;
814 }
815
816 /* This start the kernel tracing */
817 ret = kernel_start_session(ksess);
818 if (ret < 0) {
819 ret = LTTNG_ERR_KERN_START_FAIL;
820 goto error;
821 }
822
823 /* Quiescent wait after starting trace */
824 kernel_wait_quiescent(kernel_tracer_fd);
825
826 ksess->started = 1;
827
828 ret = LTTNG_OK;
829
830 error:
831 return ret;
832 }
833
834 /*
835 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
836 */
837 int cmd_disable_channel(struct ltt_session *session, int domain,
838 char *channel_name)
839 {
840 int ret;
841 struct ltt_ust_session *usess;
842
843 usess = session->ust_session;
844
845 rcu_read_lock();
846
847 switch (domain) {
848 case LTTNG_DOMAIN_KERNEL:
849 {
850 ret = channel_kernel_disable(session->kernel_session,
851 channel_name);
852 if (ret != LTTNG_OK) {
853 goto error;
854 }
855
856 kernel_wait_quiescent(kernel_tracer_fd);
857 break;
858 }
859 case LTTNG_DOMAIN_UST:
860 {
861 struct ltt_ust_channel *uchan;
862 struct lttng_ht *chan_ht;
863
864 chan_ht = usess->domain_global.channels;
865
866 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
867 if (uchan == NULL) {
868 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
869 goto error;
870 }
871
872 ret = channel_ust_disable(usess, uchan);
873 if (ret != LTTNG_OK) {
874 goto error;
875 }
876 break;
877 }
878 #if 0
879 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
880 case LTTNG_DOMAIN_UST_EXEC_NAME:
881 case LTTNG_DOMAIN_UST_PID:
882 #endif
883 default:
884 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
885 goto error;
886 }
887
888 ret = LTTNG_OK;
889
890 error:
891 rcu_read_unlock();
892 return ret;
893 }
894
895 /*
896 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
897 *
898 * The wpipe arguments is used as a notifier for the kernel thread.
899 */
900 int cmd_enable_channel(struct ltt_session *session,
901 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
902 {
903 int ret;
904 struct ltt_ust_session *usess = session->ust_session;
905 struct lttng_ht *chan_ht;
906
907 assert(session);
908 assert(attr);
909 assert(domain);
910
911 DBG("Enabling channel %s for session %s", attr->name, session->name);
912
913 rcu_read_lock();
914
915 /*
916 * Don't try to enable a channel if the session has been started at
917 * some point in time before. The tracer does not allow it.
918 */
919 if (session->started) {
920 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
921 goto error;
922 }
923
924 /*
925 * If the session is a live session, remove the switch timer, the
926 * live timer does the same thing but sends also synchronisation
927 * beacons for inactive streams.
928 */
929 if (session->live_timer > 0) {
930 attr->attr.live_timer_interval = session->live_timer;
931 attr->attr.switch_timer_interval = 0;
932 }
933
934 switch (domain->type) {
935 case LTTNG_DOMAIN_KERNEL:
936 {
937 struct ltt_kernel_channel *kchan;
938
939 kchan = trace_kernel_get_channel_by_name(attr->name,
940 session->kernel_session);
941 if (kchan == NULL) {
942 /*
943 * Don't try to create a channel if the session
944 * has been started at some point in time
945 * before. The tracer does not allow it.
946 */
947 if (session->started) {
948 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
949 goto error;
950 }
951 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
952 if (attr->name[0] != '\0') {
953 session->kernel_session->has_non_default_channel = 1;
954 }
955 } else {
956 ret = channel_kernel_enable(session->kernel_session, kchan);
957 }
958
959 if (ret != LTTNG_OK) {
960 goto error;
961 }
962
963 kernel_wait_quiescent(kernel_tracer_fd);
964 break;
965 }
966 case LTTNG_DOMAIN_UST:
967 {
968 struct ltt_ust_channel *uchan;
969
970 chan_ht = usess->domain_global.channels;
971
972 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
973 if (uchan == NULL) {
974 /*
975 * Don't try to create a channel if the session
976 * has been started at some point in time
977 * before. The tracer does not allow it.
978 */
979 if (session->started) {
980 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
981 goto error;
982 }
983 ret = channel_ust_create(usess, attr, domain->buf_type);
984 if (attr->name[0] != '\0') {
985 usess->has_non_default_channel = 1;
986 }
987 } else {
988 ret = channel_ust_enable(usess, uchan);
989 }
990 break;
991 }
992 default:
993 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
994 goto error;
995 }
996
997 error:
998 rcu_read_unlock();
999 return ret;
1000 }
1001
1002
1003 /*
1004 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1005 */
1006 int cmd_disable_event(struct ltt_session *session, int domain,
1007 char *channel_name, char *event_name)
1008 {
1009 int ret;
1010
1011 rcu_read_lock();
1012
1013 switch (domain) {
1014 case LTTNG_DOMAIN_KERNEL:
1015 {
1016 struct ltt_kernel_channel *kchan;
1017 struct ltt_kernel_session *ksess;
1018
1019 ksess = session->kernel_session;
1020
1021 /*
1022 * If a non-default channel has been created in the
1023 * session, explicitely require that -c chan_name needs
1024 * to be provided.
1025 */
1026 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1027 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1028 goto error;
1029 }
1030
1031 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1032 if (kchan == NULL) {
1033 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1034 goto error;
1035 }
1036
1037 ret = event_kernel_disable_tracepoint(kchan, event_name);
1038 if (ret != LTTNG_OK) {
1039 goto error;
1040 }
1041
1042 kernel_wait_quiescent(kernel_tracer_fd);
1043 break;
1044 }
1045 case LTTNG_DOMAIN_UST:
1046 {
1047 struct ltt_ust_channel *uchan;
1048 struct ltt_ust_session *usess;
1049
1050 usess = session->ust_session;
1051
1052 /*
1053 * If a non-default channel has been created in the
1054 * session, explicitely require that -c chan_name needs
1055 * to be provided.
1056 */
1057 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1058 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1059 goto error;
1060 }
1061
1062 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1063 channel_name);
1064 if (uchan == NULL) {
1065 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1066 goto error;
1067 }
1068
1069 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1070 if (ret != LTTNG_OK) {
1071 goto error;
1072 }
1073
1074 DBG3("Disable UST event %s in channel %s completed", event_name,
1075 channel_name);
1076 break;
1077 }
1078 case LTTNG_DOMAIN_JUL:
1079 {
1080 struct ltt_ust_session *usess = session->ust_session;
1081
1082 assert(usess);
1083
1084 ret = event_jul_disable(usess, event_name);
1085 if (ret != LTTNG_OK) {
1086 goto error;
1087 }
1088
1089 break;
1090 }
1091 #if 0
1092 case LTTNG_DOMAIN_UST_EXEC_NAME:
1093 case LTTNG_DOMAIN_UST_PID:
1094 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1095 #endif
1096 default:
1097 ret = LTTNG_ERR_UND;
1098 goto error;
1099 }
1100
1101 ret = LTTNG_OK;
1102
1103 error:
1104 rcu_read_unlock();
1105 return ret;
1106 }
1107
1108 /*
1109 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1110 */
1111 int cmd_disable_event_all(struct ltt_session *session, int domain,
1112 char *channel_name)
1113 {
1114 int ret;
1115
1116 rcu_read_lock();
1117
1118 switch (domain) {
1119 case LTTNG_DOMAIN_KERNEL:
1120 {
1121 struct ltt_kernel_session *ksess;
1122 struct ltt_kernel_channel *kchan;
1123
1124 ksess = session->kernel_session;
1125
1126 /*
1127 * If a non-default channel has been created in the
1128 * session, explicitely require that -c chan_name needs
1129 * to be provided.
1130 */
1131 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1132 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1133 goto error;
1134 }
1135
1136 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1137 if (kchan == NULL) {
1138 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1139 goto error;
1140 }
1141
1142 ret = event_kernel_disable_all(kchan);
1143 if (ret != LTTNG_OK) {
1144 goto error;
1145 }
1146
1147 kernel_wait_quiescent(kernel_tracer_fd);
1148 break;
1149 }
1150 case LTTNG_DOMAIN_UST:
1151 {
1152 struct ltt_ust_session *usess;
1153 struct ltt_ust_channel *uchan;
1154
1155 usess = session->ust_session;
1156
1157 /*
1158 * If a non-default channel has been created in the
1159 * session, explicitely require that -c chan_name needs
1160 * to be provided.
1161 */
1162 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1163 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1164 goto error;
1165 }
1166
1167 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1168 channel_name);
1169 if (uchan == NULL) {
1170 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1171 goto error;
1172 }
1173
1174 ret = event_ust_disable_all_tracepoints(usess, uchan);
1175 if (ret != 0) {
1176 goto error;
1177 }
1178
1179 DBG3("Disable all UST events in channel %s completed", channel_name);
1180
1181 break;
1182 }
1183 case LTTNG_DOMAIN_JUL:
1184 {
1185 struct ltt_ust_session *usess = session->ust_session;
1186
1187 assert(usess);
1188
1189 ret = event_jul_disable_all(usess);
1190 if (ret != LTTNG_OK) {
1191 goto error;
1192 }
1193
1194 break;
1195 }
1196 #if 0
1197 case LTTNG_DOMAIN_UST_EXEC_NAME:
1198 case LTTNG_DOMAIN_UST_PID:
1199 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1200 #endif
1201 default:
1202 ret = LTTNG_ERR_UND;
1203 goto error;
1204 }
1205
1206 ret = LTTNG_OK;
1207
1208 error:
1209 rcu_read_unlock();
1210 return ret;
1211 }
1212
1213 /*
1214 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1215 */
1216 int cmd_add_context(struct ltt_session *session, int domain,
1217 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1218 {
1219 int ret, chan_kern_created = 0, chan_ust_created = 0;
1220
1221 switch (domain) {
1222 case LTTNG_DOMAIN_KERNEL:
1223 assert(session->kernel_session);
1224
1225 if (session->kernel_session->channel_count == 0) {
1226 /* Create default channel */
1227 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1228 if (ret != LTTNG_OK) {
1229 goto error;
1230 }
1231 chan_kern_created = 1;
1232 }
1233 /* Add kernel context to kernel tracer */
1234 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1235 if (ret != LTTNG_OK) {
1236 goto error;
1237 }
1238 break;
1239 case LTTNG_DOMAIN_UST:
1240 {
1241 struct ltt_ust_session *usess = session->ust_session;
1242 unsigned int chan_count;
1243
1244 assert(usess);
1245
1246 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1247 if (chan_count == 0) {
1248 struct lttng_channel *attr;
1249 /* Create default channel */
1250 attr = channel_new_default_attr(domain, usess->buffer_type);
1251 if (attr == NULL) {
1252 ret = LTTNG_ERR_FATAL;
1253 goto error;
1254 }
1255
1256 ret = channel_ust_create(usess, attr, usess->buffer_type);
1257 if (ret != LTTNG_OK) {
1258 free(attr);
1259 goto error;
1260 }
1261 free(attr);
1262 chan_ust_created = 1;
1263 }
1264
1265 ret = context_ust_add(usess, domain, ctx, channel_name);
1266 if (ret != LTTNG_OK) {
1267 goto error;
1268 }
1269 break;
1270 }
1271 #if 0
1272 case LTTNG_DOMAIN_UST_EXEC_NAME:
1273 case LTTNG_DOMAIN_UST_PID:
1274 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1275 #endif
1276 default:
1277 ret = LTTNG_ERR_UND;
1278 goto error;
1279 }
1280
1281 return LTTNG_OK;
1282
1283 error:
1284 if (chan_kern_created) {
1285 struct ltt_kernel_channel *kchan =
1286 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1287 session->kernel_session);
1288 /* Created previously, this should NOT fail. */
1289 assert(kchan);
1290 kernel_destroy_channel(kchan);
1291 }
1292
1293 if (chan_ust_created) {
1294 struct ltt_ust_channel *uchan =
1295 trace_ust_find_channel_by_name(
1296 session->ust_session->domain_global.channels,
1297 DEFAULT_CHANNEL_NAME);
1298 /* Created previously, this should NOT fail. */
1299 assert(uchan);
1300 /* Remove from the channel list of the session. */
1301 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1302 uchan);
1303 trace_ust_destroy_channel(uchan);
1304 }
1305 return ret;
1306 }
1307
1308 /*
1309 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1310 */
1311 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1312 char *channel_name, struct lttng_event *event,
1313 char *filter_expression,
1314 struct lttng_filter_bytecode *filter,
1315 struct lttng_event_exclusion *exclusion,
1316 int wpipe)
1317 {
1318 int ret, channel_created = 0;
1319 struct lttng_channel *attr;
1320
1321 assert(session);
1322 assert(event);
1323 assert(channel_name);
1324
1325 rcu_read_lock();
1326
1327 switch (domain->type) {
1328 case LTTNG_DOMAIN_KERNEL:
1329 {
1330 struct ltt_kernel_channel *kchan;
1331
1332 /*
1333 * If a non-default channel has been created in the
1334 * session, explicitely require that -c chan_name needs
1335 * to be provided.
1336 */
1337 if (session->kernel_session->has_non_default_channel
1338 && channel_name[0] == '\0') {
1339 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1340 goto error;
1341 }
1342
1343 kchan = trace_kernel_get_channel_by_name(channel_name,
1344 session->kernel_session);
1345 if (kchan == NULL) {
1346 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1347 LTTNG_BUFFER_GLOBAL);
1348 if (attr == NULL) {
1349 ret = LTTNG_ERR_FATAL;
1350 goto error;
1351 }
1352 strncpy(attr->name, channel_name, sizeof(attr->name));
1353
1354 ret = cmd_enable_channel(session, domain, attr, wpipe);
1355 if (ret != LTTNG_OK) {
1356 free(attr);
1357 goto error;
1358 }
1359 free(attr);
1360
1361 channel_created = 1;
1362 }
1363
1364 /* Get the newly created kernel channel pointer */
1365 kchan = trace_kernel_get_channel_by_name(channel_name,
1366 session->kernel_session);
1367 if (kchan == NULL) {
1368 /* This sould not happen... */
1369 ret = LTTNG_ERR_FATAL;
1370 goto error;
1371 }
1372
1373 ret = event_kernel_enable_tracepoint(kchan, event);
1374 if (ret != LTTNG_OK) {
1375 if (channel_created) {
1376 /* Let's not leak a useless channel. */
1377 kernel_destroy_channel(kchan);
1378 }
1379 goto error;
1380 }
1381
1382 kernel_wait_quiescent(kernel_tracer_fd);
1383 break;
1384 }
1385 case LTTNG_DOMAIN_UST:
1386 {
1387 struct ltt_ust_channel *uchan;
1388 struct ltt_ust_session *usess = session->ust_session;
1389
1390 assert(usess);
1391
1392 /*
1393 * If a non-default channel has been created in the
1394 * session, explicitely require that -c chan_name needs
1395 * to be provided.
1396 */
1397 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1398 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1399 goto error;
1400 }
1401
1402 /* Get channel from global UST domain */
1403 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1404 channel_name);
1405 if (uchan == NULL) {
1406 /* Create default channel */
1407 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1408 usess->buffer_type);
1409 if (attr == NULL) {
1410 ret = LTTNG_ERR_FATAL;
1411 goto error;
1412 }
1413 strncpy(attr->name, channel_name, sizeof(attr->name));
1414
1415 ret = cmd_enable_channel(session, domain, attr, wpipe);
1416 if (ret != LTTNG_OK) {
1417 free(attr);
1418 goto error;
1419 }
1420 free(attr);
1421
1422 /* Get the newly created channel reference back */
1423 uchan = trace_ust_find_channel_by_name(
1424 usess->domain_global.channels, channel_name);
1425 assert(uchan);
1426 }
1427
1428 /* At this point, the session and channel exist on the tracer */
1429 ret = event_ust_enable_tracepoint(usess, uchan, event,
1430 filter_expression, filter, exclusion);
1431 if (ret != LTTNG_OK) {
1432 goto error;
1433 }
1434 break;
1435 }
1436 case LTTNG_DOMAIN_JUL:
1437 {
1438 struct lttng_event uevent;
1439 struct lttng_domain tmp_dom;
1440 struct ltt_ust_session *usess = session->ust_session;
1441
1442 assert(usess);
1443
1444 /* Create the default JUL tracepoint. */
1445 memset(&uevent, 0, sizeof(uevent));
1446 uevent.type = LTTNG_EVENT_TRACEPOINT;
1447 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1448 if (is_root) {
1449 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1450 sizeof(uevent.name));
1451 } else {
1452 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1453 sizeof(uevent.name));
1454 }
1455 uevent.name[sizeof(uevent.name) - 1] = '\0';
1456
1457 /*
1458 * The domain type is changed because we are about to enable the
1459 * default channel and event for the JUL domain that are hardcoded.
1460 * This happens in the UST domain.
1461 */
1462 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1463 tmp_dom.type = LTTNG_DOMAIN_UST;
1464
1465 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1466 &uevent, NULL, NULL, NULL, wpipe);
1467 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1468 goto error;
1469 }
1470
1471 /* The wild card * means that everything should be enabled. */
1472 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1473 ret = event_jul_enable_all(usess, event);
1474 } else {
1475 ret = event_jul_enable(usess, event);
1476 }
1477 if (ret != LTTNG_OK) {
1478 goto error;
1479 }
1480
1481 break;
1482 }
1483 #if 0
1484 case LTTNG_DOMAIN_UST_EXEC_NAME:
1485 case LTTNG_DOMAIN_UST_PID:
1486 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1487 #endif
1488 default:
1489 ret = LTTNG_ERR_UND;
1490 goto error;
1491 }
1492
1493 ret = LTTNG_OK;
1494
1495 error:
1496 rcu_read_unlock();
1497 return ret;
1498 }
1499
1500 /*
1501 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1502 */
1503 int cmd_enable_event_all(struct ltt_session *session,
1504 struct lttng_domain *domain, char *channel_name, int event_type,
1505 char *filter_expression,
1506 struct lttng_filter_bytecode *filter, int wpipe)
1507 {
1508 int ret;
1509 struct lttng_channel *attr;
1510
1511 assert(session);
1512 assert(channel_name);
1513
1514 rcu_read_lock();
1515
1516 switch (domain->type) {
1517 case LTTNG_DOMAIN_KERNEL:
1518 {
1519 struct ltt_kernel_channel *kchan;
1520
1521 assert(session->kernel_session);
1522
1523 /*
1524 * If a non-default channel has been created in the
1525 * session, explicitely require that -c chan_name needs
1526 * to be provided.
1527 */
1528 if (session->kernel_session->has_non_default_channel
1529 && channel_name[0] == '\0') {
1530 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1531 goto error;
1532 }
1533
1534 kchan = trace_kernel_get_channel_by_name(channel_name,
1535 session->kernel_session);
1536 if (kchan == NULL) {
1537 /* Create default channel */
1538 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1539 LTTNG_BUFFER_GLOBAL);
1540 if (attr == NULL) {
1541 ret = LTTNG_ERR_FATAL;
1542 goto error;
1543 }
1544 strncpy(attr->name, channel_name, sizeof(attr->name));
1545
1546 ret = cmd_enable_channel(session, domain, attr, wpipe);
1547 if (ret != LTTNG_OK) {
1548 free(attr);
1549 goto error;
1550 }
1551 free(attr);
1552
1553 /* Get the newly created kernel channel pointer */
1554 kchan = trace_kernel_get_channel_by_name(channel_name,
1555 session->kernel_session);
1556 assert(kchan);
1557 }
1558
1559 switch (event_type) {
1560 case LTTNG_EVENT_SYSCALL:
1561 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1562 break;
1563 case LTTNG_EVENT_TRACEPOINT:
1564 /*
1565 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1566 * events already registered to the channel.
1567 */
1568 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1569 break;
1570 case LTTNG_EVENT_ALL:
1571 /* Enable syscalls and tracepoints */
1572 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1573 break;
1574 default:
1575 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1576 goto error;
1577 }
1578
1579 /* Manage return value */
1580 if (ret != LTTNG_OK) {
1581 /*
1582 * On error, cmd_enable_channel call will take care of destroying
1583 * the created channel if it was needed.
1584 */
1585 goto error;
1586 }
1587
1588 kernel_wait_quiescent(kernel_tracer_fd);
1589 break;
1590 }
1591 case LTTNG_DOMAIN_UST:
1592 {
1593 struct ltt_ust_channel *uchan;
1594 struct ltt_ust_session *usess = session->ust_session;
1595
1596 assert(usess);
1597
1598 /*
1599 * If a non-default channel has been created in the
1600 * session, explicitely require that -c chan_name needs
1601 * to be provided.
1602 */
1603 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1604 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1605 goto error;
1606 }
1607
1608 /* Get channel from global UST domain */
1609 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1610 channel_name);
1611 if (uchan == NULL) {
1612 /* Create default channel */
1613 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1614 usess->buffer_type);
1615 if (attr == NULL) {
1616 ret = LTTNG_ERR_FATAL;
1617 goto error;
1618 }
1619 strncpy(attr->name, channel_name, sizeof(attr->name));
1620
1621 ret = cmd_enable_channel(session, domain, attr, wpipe);
1622 if (ret != LTTNG_OK) {
1623 free(attr);
1624 goto error;
1625 }
1626 free(attr);
1627
1628 /* Get the newly created channel reference back */
1629 uchan = trace_ust_find_channel_by_name(
1630 usess->domain_global.channels, channel_name);
1631 assert(uchan);
1632 }
1633
1634 /* At this point, the session and channel exist on the tracer */
1635
1636 switch (event_type) {
1637 case LTTNG_EVENT_ALL:
1638 case LTTNG_EVENT_TRACEPOINT:
1639 ret = event_ust_enable_all_tracepoints(usess, uchan,
1640 filter_expression, filter);
1641 if (ret != LTTNG_OK) {
1642 goto error;
1643 }
1644 break;
1645 default:
1646 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1647 goto error;
1648 }
1649
1650 /* Manage return value */
1651 if (ret != LTTNG_OK) {
1652 goto error;
1653 }
1654
1655 break;
1656 }
1657 case LTTNG_DOMAIN_JUL:
1658 {
1659 struct lttng_event uevent, event;
1660 struct lttng_domain tmp_dom;
1661 struct ltt_ust_session *usess = session->ust_session;
1662
1663 assert(usess);
1664
1665 /* Create the default JUL tracepoint. */
1666 uevent.type = LTTNG_EVENT_TRACEPOINT;
1667 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1668 if (is_root) {
1669 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1670 sizeof(uevent.name));
1671 } else {
1672 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1673 sizeof(uevent.name));
1674 }
1675 uevent.name[sizeof(uevent.name) - 1] = '\0';
1676
1677 /*
1678 * The domain type is changed because we are about to enable the
1679 * default channel and event for the JUL domain that are hardcoded.
1680 * This happens in the UST domain.
1681 */
1682 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1683 tmp_dom.type = LTTNG_DOMAIN_UST;
1684
1685 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1686 &uevent, NULL, NULL, NULL, wpipe);
1687 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1688 goto error;
1689 }
1690
1691 event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1692 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1693 strncpy(event.name, "*", sizeof(event.name));
1694 event.name[sizeof(event.name) - 1] = '\0';
1695
1696 ret = event_jul_enable_all(usess, &event);
1697 if (ret != LTTNG_OK) {
1698 goto error;
1699 }
1700
1701 break;
1702 }
1703 #if 0
1704 case LTTNG_DOMAIN_UST_EXEC_NAME:
1705 case LTTNG_DOMAIN_UST_PID:
1706 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1707 #endif
1708 default:
1709 ret = LTTNG_ERR_UND;
1710 goto error;
1711 }
1712
1713 ret = LTTNG_OK;
1714
1715 error:
1716 rcu_read_unlock();
1717 return ret;
1718 }
1719
1720
1721 /*
1722 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1723 */
1724 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1725 {
1726 int ret;
1727 ssize_t nb_events = 0;
1728
1729 switch (domain) {
1730 case LTTNG_DOMAIN_KERNEL:
1731 nb_events = kernel_list_events(kernel_tracer_fd, events);
1732 if (nb_events < 0) {
1733 ret = LTTNG_ERR_KERN_LIST_FAIL;
1734 goto error;
1735 }
1736 break;
1737 case LTTNG_DOMAIN_UST:
1738 nb_events = ust_app_list_events(events);
1739 if (nb_events < 0) {
1740 ret = LTTNG_ERR_UST_LIST_FAIL;
1741 goto error;
1742 }
1743 break;
1744 case LTTNG_DOMAIN_JUL:
1745 nb_events = jul_list_events(events);
1746 if (nb_events < 0) {
1747 ret = LTTNG_ERR_UST_LIST_FAIL;
1748 goto error;
1749 }
1750 break;
1751 default:
1752 ret = LTTNG_ERR_UND;
1753 goto error;
1754 }
1755
1756 return nb_events;
1757
1758 error:
1759 /* Return negative value to differentiate return code */
1760 return -ret;
1761 }
1762
1763 /*
1764 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1765 */
1766 ssize_t cmd_list_tracepoint_fields(int domain,
1767 struct lttng_event_field **fields)
1768 {
1769 int ret;
1770 ssize_t nb_fields = 0;
1771
1772 switch (domain) {
1773 case LTTNG_DOMAIN_UST:
1774 nb_fields = ust_app_list_event_fields(fields);
1775 if (nb_fields < 0) {
1776 ret = LTTNG_ERR_UST_LIST_FAIL;
1777 goto error;
1778 }
1779 break;
1780 case LTTNG_DOMAIN_KERNEL:
1781 default: /* fall-through */
1782 ret = LTTNG_ERR_UND;
1783 goto error;
1784 }
1785
1786 return nb_fields;
1787
1788 error:
1789 /* Return negative value to differentiate return code */
1790 return -ret;
1791 }
1792
1793 /*
1794 * Command LTTNG_START_TRACE processed by the client thread.
1795 */
1796 int cmd_start_trace(struct ltt_session *session)
1797 {
1798 int ret;
1799 unsigned long nb_chan = 0;
1800 struct ltt_kernel_session *ksession;
1801 struct ltt_ust_session *usess;
1802
1803 assert(session);
1804
1805 /* Ease our life a bit ;) */
1806 ksession = session->kernel_session;
1807 usess = session->ust_session;
1808
1809 if (session->enabled) {
1810 /* Already started. */
1811 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1812 goto error;
1813 }
1814
1815 /*
1816 * Starting a session without channel is useless since after that it's not
1817 * possible to enable channel thus inform the client.
1818 */
1819 if (usess && usess->domain_global.channels) {
1820 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1821 }
1822 if (ksession) {
1823 nb_chan += ksession->channel_count;
1824 }
1825 if (!nb_chan) {
1826 ret = LTTNG_ERR_NO_CHANNEL;
1827 goto error;
1828 }
1829
1830 session->enabled = 1;
1831
1832 /* Kernel tracing */
1833 if (ksession != NULL) {
1834 ret = start_kernel_session(ksession, kernel_tracer_fd);
1835 if (ret != LTTNG_OK) {
1836 goto error;
1837 }
1838 }
1839
1840 /* Flag session that trace should start automatically */
1841 if (usess) {
1842 usess->start_trace = 1;
1843
1844 ret = ust_app_start_trace_all(usess);
1845 if (ret < 0) {
1846 ret = LTTNG_ERR_UST_START_FAIL;
1847 goto error;
1848 }
1849 }
1850
1851 session->started = 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 if (!session->enabled) {
1876 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1877 goto error;
1878 }
1879
1880 session->enabled = 0;
1881
1882 /* Kernel tracer */
1883 if (ksession && ksession->started) {
1884 DBG("Stop kernel tracing");
1885
1886 /* Flush metadata if exist */
1887 if (ksession->metadata_stream_fd >= 0) {
1888 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1889 if (ret < 0) {
1890 ERR("Kernel metadata flush failed");
1891 }
1892 }
1893
1894 /* Flush all buffers before stopping */
1895 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1896 ret = kernel_flush_buffer(kchan);
1897 if (ret < 0) {
1898 ERR("Kernel flush buffer error");
1899 }
1900 }
1901
1902 ret = kernel_stop_session(ksession);
1903 if (ret < 0) {
1904 ret = LTTNG_ERR_KERN_STOP_FAIL;
1905 goto error;
1906 }
1907
1908 kernel_wait_quiescent(kernel_tracer_fd);
1909
1910 ksession->started = 0;
1911 }
1912
1913 if (usess && usess->start_trace) {
1914 usess->start_trace = 0;
1915
1916 ret = ust_app_stop_trace_all(usess);
1917 if (ret < 0) {
1918 ret = LTTNG_ERR_UST_STOP_FAIL;
1919 goto error;
1920 }
1921 }
1922
1923 ret = LTTNG_OK;
1924
1925 error:
1926 return ret;
1927 }
1928
1929 /*
1930 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1931 */
1932 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1933 size_t nb_uri, struct lttng_uri *uris)
1934 {
1935 int ret, i;
1936 struct ltt_kernel_session *ksess = session->kernel_session;
1937 struct ltt_ust_session *usess = session->ust_session;
1938 struct consumer_output *consumer = NULL;
1939
1940 assert(session);
1941 assert(uris);
1942 assert(nb_uri > 0);
1943
1944 /* Can't enable consumer after session started. */
1945 if (session->enabled) {
1946 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1947 goto error;
1948 }
1949
1950 /*
1951 * This case switch makes sure the domain session has a temporary consumer
1952 * so the URL can be set.
1953 */
1954 switch (domain) {
1955 case 0:
1956 /* Code flow error. A session MUST always have a consumer object */
1957 assert(session->consumer);
1958 /*
1959 * The URL will be added to the tracing session consumer instead of a
1960 * specific domain consumer.
1961 */
1962 consumer = session->consumer;
1963 break;
1964 case LTTNG_DOMAIN_KERNEL:
1965 /* Code flow error if we don't have a kernel session here. */
1966 assert(ksess);
1967 assert(ksess->consumer);
1968 consumer = ksess->consumer;
1969 break;
1970 case LTTNG_DOMAIN_UST:
1971 /* Code flow error if we don't have a kernel session here. */
1972 assert(usess);
1973 assert(usess->consumer);
1974 consumer = usess->consumer;
1975 break;
1976 }
1977
1978 for (i = 0; i < nb_uri; i++) {
1979 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1980 if (ret != LTTNG_OK) {
1981 goto error;
1982 }
1983 }
1984
1985 /* All good! */
1986 ret = LTTNG_OK;
1987
1988 error:
1989 return ret;
1990 }
1991
1992 /*
1993 * Command LTTNG_CREATE_SESSION processed by the client thread.
1994 */
1995 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1996 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
1997 {
1998 int ret;
1999 struct ltt_session *session;
2000
2001 assert(name);
2002 assert(creds);
2003
2004 /*
2005 * Verify if the session already exist
2006 *
2007 * XXX: There is no need for the session lock list here since the caller
2008 * (process_client_msg) is holding it. We might want to change that so a
2009 * single command does not lock the entire session list.
2010 */
2011 session = session_find_by_name(name);
2012 if (session != NULL) {
2013 ret = LTTNG_ERR_EXIST_SESS;
2014 goto find_error;
2015 }
2016
2017 /* Create tracing session in the registry */
2018 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2019 LTTNG_SOCK_GET_GID_CRED(creds));
2020 if (ret != LTTNG_OK) {
2021 goto session_error;
2022 }
2023
2024 /*
2025 * Get the newly created session pointer back
2026 *
2027 * XXX: There is no need for the session lock list here since the caller
2028 * (process_client_msg) is holding it. We might want to change that so a
2029 * single command does not lock the entire session list.
2030 */
2031 session = session_find_by_name(name);
2032 assert(session);
2033
2034 session->live_timer = live_timer;
2035 /* Create default consumer output for the session not yet created. */
2036 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2037 if (session->consumer == NULL) {
2038 ret = LTTNG_ERR_FATAL;
2039 goto consumer_error;
2040 }
2041
2042 if (uris) {
2043 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2044 if (ret != LTTNG_OK) {
2045 goto consumer_error;
2046 }
2047 session->output_traces = 1;
2048 } else {
2049 session->output_traces = 0;
2050 DBG2("Session %s created with no output", session->name);
2051 }
2052
2053 session->consumer->enabled = 1;
2054
2055 return LTTNG_OK;
2056
2057 consumer_error:
2058 session_destroy(session);
2059 session_error:
2060 find_error:
2061 return ret;
2062 }
2063
2064 /*
2065 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2066 */
2067 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2068 size_t nb_uri, lttng_sock_cred *creds)
2069 {
2070 int ret;
2071 struct ltt_session *session;
2072 struct snapshot_output *new_output = NULL;
2073
2074 assert(name);
2075 assert(creds);
2076
2077 /*
2078 * Create session in no output mode with URIs set to NULL. The uris we've
2079 * received are for a default snapshot output if one.
2080 */
2081 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2082 if (ret != LTTNG_OK) {
2083 goto error;
2084 }
2085
2086 /* Get the newly created session pointer back. This should NEVER fail. */
2087 session = session_find_by_name(name);
2088 assert(session);
2089
2090 /* Flag session for snapshot mode. */
2091 session->snapshot_mode = 1;
2092
2093 /* Skip snapshot output creation if no URI is given. */
2094 if (nb_uri == 0) {
2095 goto end;
2096 }
2097
2098 new_output = snapshot_output_alloc();
2099 if (!new_output) {
2100 ret = LTTNG_ERR_NOMEM;
2101 goto error_snapshot_alloc;
2102 }
2103
2104 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2105 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2106 if (ret < 0) {
2107 if (ret == -ENOMEM) {
2108 ret = LTTNG_ERR_NOMEM;
2109 } else {
2110 ret = LTTNG_ERR_INVALID;
2111 }
2112 goto error_snapshot;
2113 }
2114
2115 rcu_read_lock();
2116 snapshot_add_output(&session->snapshot, new_output);
2117 rcu_read_unlock();
2118
2119 end:
2120 return LTTNG_OK;
2121
2122 error_snapshot:
2123 snapshot_output_destroy(new_output);
2124 error_snapshot_alloc:
2125 session_destroy(session);
2126 error:
2127 return ret;
2128 }
2129
2130 /*
2131 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2132 */
2133 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2134 {
2135 int ret;
2136 struct ltt_ust_session *usess;
2137 struct ltt_kernel_session *ksess;
2138
2139 /* Safety net */
2140 assert(session);
2141
2142 usess = session->ust_session;
2143 ksess = session->kernel_session;
2144
2145 /* Clean kernel session teardown */
2146 kernel_destroy_session(ksess);
2147
2148 /* UST session teardown */
2149 if (usess) {
2150 /* Close any relayd session */
2151 consumer_output_send_destroy_relayd(usess->consumer);
2152
2153 /* Destroy every UST application related to this session. */
2154 ret = ust_app_destroy_trace_all(usess);
2155 if (ret) {
2156 ERR("Error in ust_app_destroy_trace_all");
2157 }
2158
2159 /* Clean up the rest. */
2160 trace_ust_destroy_session(usess);
2161 }
2162
2163 /*
2164 * Must notify the kernel thread here to update it's poll set in order to
2165 * remove the channel(s)' fd just destroyed.
2166 */
2167 ret = notify_thread_pipe(wpipe);
2168 if (ret < 0) {
2169 PERROR("write kernel poll pipe");
2170 }
2171
2172 ret = session_destroy(session);
2173
2174 return ret;
2175 }
2176
2177 /*
2178 * Command LTTNG_CALIBRATE processed by the client thread.
2179 */
2180 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2181 {
2182 int ret;
2183
2184 switch (domain) {
2185 case LTTNG_DOMAIN_KERNEL:
2186 {
2187 struct lttng_kernel_calibrate kcalibrate;
2188
2189 switch (calibrate->type) {
2190 case LTTNG_CALIBRATE_FUNCTION:
2191 default:
2192 /* Default and only possible calibrate option. */
2193 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2194 break;
2195 }
2196
2197 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2198 if (ret < 0) {
2199 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2200 goto error;
2201 }
2202 break;
2203 }
2204 case LTTNG_DOMAIN_UST:
2205 {
2206 struct lttng_ust_calibrate ucalibrate;
2207
2208 switch (calibrate->type) {
2209 case LTTNG_CALIBRATE_FUNCTION:
2210 default:
2211 /* Default and only possible calibrate option. */
2212 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2213 break;
2214 }
2215
2216 ret = ust_app_calibrate_glb(&ucalibrate);
2217 if (ret < 0) {
2218 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2219 goto error;
2220 }
2221 break;
2222 }
2223 default:
2224 ret = LTTNG_ERR_UND;
2225 goto error;
2226 }
2227
2228 ret = LTTNG_OK;
2229
2230 error:
2231 return ret;
2232 }
2233
2234 /*
2235 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2236 */
2237 int cmd_register_consumer(struct ltt_session *session, int domain,
2238 const char *sock_path, struct consumer_data *cdata)
2239 {
2240 int ret, sock;
2241 struct consumer_socket *socket = NULL;
2242
2243 assert(session);
2244 assert(cdata);
2245 assert(sock_path);
2246
2247 switch (domain) {
2248 case LTTNG_DOMAIN_KERNEL:
2249 {
2250 struct ltt_kernel_session *ksess = session->kernel_session;
2251
2252 assert(ksess);
2253
2254 /* Can't register a consumer if there is already one */
2255 if (ksess->consumer_fds_sent != 0) {
2256 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2257 goto error;
2258 }
2259
2260 sock = lttcomm_connect_unix_sock(sock_path);
2261 if (sock < 0) {
2262 ret = LTTNG_ERR_CONNECT_FAIL;
2263 goto error;
2264 }
2265 cdata->cmd_sock = sock;
2266
2267 socket = consumer_allocate_socket(&cdata->cmd_sock);
2268 if (socket == NULL) {
2269 ret = close(sock);
2270 if (ret < 0) {
2271 PERROR("close register consumer");
2272 }
2273 cdata->cmd_sock = -1;
2274 ret = LTTNG_ERR_FATAL;
2275 goto error;
2276 }
2277
2278 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2279 if (socket->lock == NULL) {
2280 PERROR("zmalloc pthread mutex");
2281 ret = LTTNG_ERR_FATAL;
2282 goto error;
2283 }
2284 pthread_mutex_init(socket->lock, NULL);
2285 socket->registered = 1;
2286
2287 rcu_read_lock();
2288 consumer_add_socket(socket, ksess->consumer);
2289 rcu_read_unlock();
2290
2291 pthread_mutex_lock(&cdata->pid_mutex);
2292 cdata->pid = -1;
2293 pthread_mutex_unlock(&cdata->pid_mutex);
2294
2295 break;
2296 }
2297 default:
2298 /* TODO: Userspace tracing */
2299 ret = LTTNG_ERR_UND;
2300 goto error;
2301 }
2302
2303 return LTTNG_OK;
2304
2305 error:
2306 if (socket) {
2307 consumer_destroy_socket(socket);
2308 }
2309 return ret;
2310 }
2311
2312 /*
2313 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2314 */
2315 ssize_t cmd_list_domains(struct ltt_session *session,
2316 struct lttng_domain **domains)
2317 {
2318 int ret, index = 0;
2319 ssize_t nb_dom = 0;
2320
2321 if (session->kernel_session != NULL) {
2322 DBG3("Listing domains found kernel domain");
2323 nb_dom++;
2324 }
2325
2326 if (session->ust_session != NULL) {
2327 DBG3("Listing domains found UST global domain");
2328 nb_dom++;
2329
2330 if (session->ust_session->domain_jul.being_used) {
2331 nb_dom++;
2332 }
2333 }
2334
2335 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2336 if (*domains == NULL) {
2337 ret = LTTNG_ERR_FATAL;
2338 goto error;
2339 }
2340
2341 if (session->kernel_session != NULL) {
2342 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2343 index++;
2344 }
2345
2346 if (session->ust_session != NULL) {
2347 (*domains)[index].type = LTTNG_DOMAIN_UST;
2348 (*domains)[index].buf_type = session->ust_session->buffer_type;
2349 index++;
2350
2351 if (session->ust_session->domain_jul.being_used) {
2352 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2353 (*domains)[index].buf_type = session->ust_session->buffer_type;
2354 index++;
2355 }
2356 }
2357
2358 return nb_dom;
2359
2360 error:
2361 /* Return negative value to differentiate return code */
2362 return -ret;
2363 }
2364
2365
2366 /*
2367 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2368 */
2369 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2370 struct lttng_channel **channels)
2371 {
2372 int ret;
2373 ssize_t nb_chan = 0;
2374
2375 switch (domain) {
2376 case LTTNG_DOMAIN_KERNEL:
2377 if (session->kernel_session != NULL) {
2378 nb_chan = session->kernel_session->channel_count;
2379 }
2380 DBG3("Number of kernel channels %zd", nb_chan);
2381 if (nb_chan <= 0) {
2382 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2383 }
2384 break;
2385 case LTTNG_DOMAIN_UST:
2386 if (session->ust_session != NULL) {
2387 nb_chan = lttng_ht_get_count(
2388 session->ust_session->domain_global.channels);
2389 }
2390 DBG3("Number of UST global channels %zd", nb_chan);
2391 if (nb_chan <= 0) {
2392 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2393 }
2394 break;
2395 default:
2396 *channels = NULL;
2397 ret = LTTNG_ERR_UND;
2398 goto error;
2399 }
2400
2401 if (nb_chan > 0) {
2402 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2403 if (*channels == NULL) {
2404 ret = LTTNG_ERR_FATAL;
2405 goto error;
2406 }
2407
2408 list_lttng_channels(domain, session, *channels);
2409 } else {
2410 *channels = NULL;
2411 /* Ret value was set in the domain switch case */
2412 goto error;
2413 }
2414
2415 return nb_chan;
2416
2417 error:
2418 /* Return negative value to differentiate return code */
2419 return -ret;
2420 }
2421
2422 /*
2423 * Command LTTNG_LIST_EVENTS processed by the client thread.
2424 */
2425 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2426 char *channel_name, struct lttng_event **events)
2427 {
2428 int ret = 0;
2429 ssize_t nb_event = 0;
2430
2431 switch (domain) {
2432 case LTTNG_DOMAIN_KERNEL:
2433 if (session->kernel_session != NULL) {
2434 nb_event = list_lttng_kernel_events(channel_name,
2435 session->kernel_session, events);
2436 }
2437 break;
2438 case LTTNG_DOMAIN_UST:
2439 {
2440 if (session->ust_session != NULL) {
2441 nb_event = list_lttng_ust_global_events(channel_name,
2442 &session->ust_session->domain_global, events);
2443 }
2444 break;
2445 }
2446 case LTTNG_DOMAIN_JUL:
2447 if (session->ust_session) {
2448 nb_event = list_lttng_jul_events(
2449 &session->ust_session->domain_jul, events);
2450 }
2451 break;
2452 default:
2453 ret = LTTNG_ERR_UND;
2454 goto error;
2455 }
2456
2457 return nb_event;
2458
2459 error:
2460 /* Return negative value to differentiate return code */
2461 return -ret;
2462 }
2463
2464 /*
2465 * Using the session list, filled a lttng_session array to send back to the
2466 * client for session listing.
2467 *
2468 * The session list lock MUST be acquired before calling this function. Use
2469 * session_lock_list() and session_unlock_list().
2470 */
2471 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2472 gid_t gid)
2473 {
2474 int ret;
2475 unsigned int i = 0;
2476 struct ltt_session *session;
2477 struct ltt_session_list *list = session_get_list();
2478
2479 DBG("Getting all available session for UID %d GID %d",
2480 uid, gid);
2481 /*
2482 * Iterate over session list and append data after the control struct in
2483 * the buffer.
2484 */
2485 cds_list_for_each_entry(session, &list->head, list) {
2486 /*
2487 * Only list the sessions the user can control.
2488 */
2489 if (!session_access_ok(session, uid, gid)) {
2490 continue;
2491 }
2492
2493 struct ltt_kernel_session *ksess = session->kernel_session;
2494 struct ltt_ust_session *usess = session->ust_session;
2495
2496 if (session->consumer->type == CONSUMER_DST_NET ||
2497 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2498 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2499 ret = build_network_session_path(sessions[i].path,
2500 sizeof(sessions[i].path), session);
2501 } else {
2502 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2503 session->consumer->dst.trace_path);
2504 }
2505 if (ret < 0) {
2506 PERROR("snprintf session path");
2507 continue;
2508 }
2509
2510 strncpy(sessions[i].name, session->name, NAME_MAX);
2511 sessions[i].name[NAME_MAX - 1] = '\0';
2512 sessions[i].enabled = session->enabled;
2513 sessions[i].snapshot_mode = session->snapshot_mode;
2514 sessions[i].live_timer_interval = session->live_timer;
2515 i++;
2516 }
2517 }
2518
2519 /*
2520 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2521 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2522 */
2523 int cmd_data_pending(struct ltt_session *session)
2524 {
2525 int ret;
2526 struct ltt_kernel_session *ksess = session->kernel_session;
2527 struct ltt_ust_session *usess = session->ust_session;
2528
2529 assert(session);
2530
2531 /* Session MUST be stopped to ask for data availability. */
2532 if (session->enabled) {
2533 ret = LTTNG_ERR_SESSION_STARTED;
2534 goto error;
2535 } else {
2536 /*
2537 * If stopped, just make sure we've started before else the above call
2538 * will always send that there is data pending.
2539 *
2540 * The consumer assumes that when the data pending command is received,
2541 * the trace has been started before or else no output data is written
2542 * by the streams which is a condition for data pending. So, this is
2543 * *VERY* important that we don't ask the consumer before a start
2544 * trace.
2545 */
2546 if (!session->started) {
2547 ret = 0;
2548 goto error;
2549 }
2550 }
2551
2552 if (ksess && ksess->consumer) {
2553 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2554 if (ret == 1) {
2555 /* Data is still being extracted for the kernel. */
2556 goto error;
2557 }
2558 }
2559
2560 if (usess && usess->consumer) {
2561 ret = consumer_is_data_pending(usess->id, usess->consumer);
2562 if (ret == 1) {
2563 /* Data is still being extracted for the kernel. */
2564 goto error;
2565 }
2566 }
2567
2568 /* Data is ready to be read by a viewer */
2569 ret = 0;
2570
2571 error:
2572 return ret;
2573 }
2574
2575 /*
2576 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2577 *
2578 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2579 */
2580 int cmd_snapshot_add_output(struct ltt_session *session,
2581 struct lttng_snapshot_output *output, uint32_t *id)
2582 {
2583 int ret;
2584 struct snapshot_output *new_output;
2585
2586 assert(session);
2587 assert(output);
2588
2589 DBG("Cmd snapshot add output for session %s", session->name);
2590
2591 /*
2592 * Permission denied to create an output if the session is not
2593 * set in no output mode.
2594 */
2595 if (session->output_traces) {
2596 ret = LTTNG_ERR_EPERM;
2597 goto error;
2598 }
2599
2600 /* Only one output is allowed until we have the "tee" feature. */
2601 if (session->snapshot.nb_output == 1) {
2602 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2603 goto error;
2604 }
2605
2606 new_output = snapshot_output_alloc();
2607 if (!new_output) {
2608 ret = LTTNG_ERR_NOMEM;
2609 goto error;
2610 }
2611
2612 ret = snapshot_output_init(output->max_size, output->name,
2613 output->ctrl_url, output->data_url, session->consumer, new_output,
2614 &session->snapshot);
2615 if (ret < 0) {
2616 if (ret == -ENOMEM) {
2617 ret = LTTNG_ERR_NOMEM;
2618 } else {
2619 ret = LTTNG_ERR_INVALID;
2620 }
2621 goto free_error;
2622 }
2623
2624 rcu_read_lock();
2625 snapshot_add_output(&session->snapshot, new_output);
2626 if (id) {
2627 *id = new_output->id;
2628 }
2629 rcu_read_unlock();
2630
2631 return LTTNG_OK;
2632
2633 free_error:
2634 snapshot_output_destroy(new_output);
2635 error:
2636 return ret;
2637 }
2638
2639 /*
2640 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2641 *
2642 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2643 */
2644 int cmd_snapshot_del_output(struct ltt_session *session,
2645 struct lttng_snapshot_output *output)
2646 {
2647 int ret;
2648 struct snapshot_output *sout = NULL;
2649
2650 assert(session);
2651 assert(output);
2652
2653 rcu_read_lock();
2654
2655 /*
2656 * Permission denied to create an output if the session is not
2657 * set in no output mode.
2658 */
2659 if (session->output_traces) {
2660 ret = LTTNG_ERR_EPERM;
2661 goto error;
2662 }
2663
2664 if (output->id) {
2665 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2666 session->name);
2667 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2668 } else if (*output->name != '\0') {
2669 DBG("Cmd snapshot del output name %s for session %s", output->name,
2670 session->name);
2671 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2672 }
2673 if (!sout) {
2674 ret = LTTNG_ERR_INVALID;
2675 goto error;
2676 }
2677
2678 snapshot_delete_output(&session->snapshot, sout);
2679 snapshot_output_destroy(sout);
2680 ret = LTTNG_OK;
2681
2682 error:
2683 rcu_read_unlock();
2684 return ret;
2685 }
2686
2687 /*
2688 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2689 *
2690 * If no output is available, outputs is untouched and 0 is returned.
2691 *
2692 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2693 */
2694 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2695 struct lttng_snapshot_output **outputs)
2696 {
2697 int ret, idx = 0;
2698 struct lttng_snapshot_output *list;
2699 struct lttng_ht_iter iter;
2700 struct snapshot_output *output;
2701
2702 assert(session);
2703 assert(outputs);
2704
2705 DBG("Cmd snapshot list outputs for session %s", session->name);
2706
2707 /*
2708 * Permission denied to create an output if the session is not
2709 * set in no output mode.
2710 */
2711 if (session->output_traces) {
2712 ret = LTTNG_ERR_EPERM;
2713 goto error;
2714 }
2715
2716 if (session->snapshot.nb_output == 0) {
2717 ret = 0;
2718 goto error;
2719 }
2720
2721 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2722 if (!list) {
2723 ret = LTTNG_ERR_NOMEM;
2724 goto error;
2725 }
2726
2727 /* Copy list from session to the new list object. */
2728 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2729 output, node.node) {
2730 assert(output->consumer);
2731 list[idx].id = output->id;
2732 list[idx].max_size = output->max_size;
2733 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2734 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2735 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2736 sizeof(list[idx].ctrl_url));
2737 } else {
2738 /* Control URI. */
2739 ret = uri_to_str_url(&output->consumer->dst.net.control,
2740 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2741 if (ret < 0) {
2742 ret = LTTNG_ERR_NOMEM;
2743 goto free_error;
2744 }
2745
2746 /* Data URI. */
2747 ret = uri_to_str_url(&output->consumer->dst.net.data,
2748 list[idx].data_url, sizeof(list[idx].data_url));
2749 if (ret < 0) {
2750 ret = LTTNG_ERR_NOMEM;
2751 goto free_error;
2752 }
2753 }
2754 idx++;
2755 }
2756
2757 *outputs = list;
2758 return session->snapshot.nb_output;
2759
2760 free_error:
2761 free(list);
2762 error:
2763 return -ret;
2764 }
2765
2766 /*
2767 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2768 * snapshot output is *not* set with a remote destination.
2769 *
2770 * Return 0 on success or a LTTNG_ERR code.
2771 */
2772 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2773 struct snapshot_output *snap_output, struct ltt_session *session)
2774 {
2775 int ret = LTTNG_OK;
2776 struct lttng_ht_iter iter;
2777 struct consumer_socket *socket;
2778
2779 assert(consumer);
2780 assert(snap_output);
2781 assert(session);
2782
2783 DBG2("Set relayd object from snapshot output");
2784
2785 /* Ignore if snapshot consumer output is not network. */
2786 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2787 goto error;
2788 }
2789
2790 /*
2791 * For each consumer socket, create and send the relayd object of the
2792 * snapshot output.
2793 */
2794 rcu_read_lock();
2795 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2796 socket, node.node) {
2797 ret = send_consumer_relayd_sockets(0, session->id,
2798 snap_output->consumer, socket,
2799 session->name, session->hostname,
2800 session->live_timer);
2801 if (ret != LTTNG_OK) {
2802 rcu_read_unlock();
2803 goto error;
2804 }
2805 }
2806 rcu_read_unlock();
2807
2808 error:
2809 return ret;
2810 }
2811
2812 /*
2813 * Record a kernel snapshot.
2814 *
2815 * Return LTTNG_OK on success or a LTTNG_ERR code.
2816 */
2817 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2818 struct snapshot_output *output, struct ltt_session *session,
2819 int wait, int nb_streams)
2820 {
2821 int ret;
2822
2823 assert(ksess);
2824 assert(output);
2825 assert(session);
2826
2827 /* Get the datetime for the snapshot output directory. */
2828 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2829 sizeof(output->datetime));
2830 if (!ret) {
2831 ret = LTTNG_ERR_INVALID;
2832 goto error;
2833 }
2834
2835 /*
2836 * Copy kernel session sockets so we can communicate with the right
2837 * consumer for the snapshot record command.
2838 */
2839 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2840 if (ret < 0) {
2841 ret = LTTNG_ERR_NOMEM;
2842 goto error;
2843 }
2844
2845 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2846 if (ret != LTTNG_OK) {
2847 goto error_snapshot;
2848 }
2849
2850 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2851 if (ret != LTTNG_OK) {
2852 goto error_snapshot;
2853 }
2854
2855 ret = LTTNG_OK;
2856
2857 error_snapshot:
2858 /* Clean up copied sockets so this output can use some other later on. */
2859 consumer_destroy_output_sockets(output->consumer);
2860 error:
2861 return ret;
2862 }
2863
2864 /*
2865 * Record a UST snapshot.
2866 *
2867 * Return 0 on success or a LTTNG_ERR error code.
2868 */
2869 static int record_ust_snapshot(struct ltt_ust_session *usess,
2870 struct snapshot_output *output, struct ltt_session *session,
2871 int wait, int nb_streams)
2872 {
2873 int ret;
2874
2875 assert(usess);
2876 assert(output);
2877 assert(session);
2878
2879 /* Get the datetime for the snapshot output directory. */
2880 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2881 sizeof(output->datetime));
2882 if (!ret) {
2883 ret = LTTNG_ERR_INVALID;
2884 goto error;
2885 }
2886
2887 /*
2888 * Copy UST session sockets so we can communicate with the right
2889 * consumer for the snapshot record command.
2890 */
2891 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2892 if (ret < 0) {
2893 ret = LTTNG_ERR_NOMEM;
2894 goto error;
2895 }
2896
2897 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2898 if (ret != LTTNG_OK) {
2899 goto error_snapshot;
2900 }
2901
2902 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2903 if (ret < 0) {
2904 switch (-ret) {
2905 case EINVAL:
2906 ret = LTTNG_ERR_INVALID;
2907 break;
2908 case ENODATA:
2909 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2910 break;
2911 default:
2912 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2913 break;
2914 }
2915 goto error_snapshot;
2916 }
2917
2918 ret = LTTNG_OK;
2919
2920 error_snapshot:
2921 /* Clean up copied sockets so this output can use some other later on. */
2922 consumer_destroy_output_sockets(output->consumer);
2923 error:
2924 return ret;
2925 }
2926
2927 /*
2928 * Returns the total number of streams for a session or a negative value
2929 * on error.
2930 */
2931 static unsigned int get_total_nb_stream(struct ltt_session *session)
2932 {
2933 unsigned int total_streams = 0;
2934
2935 if (session->kernel_session) {
2936 struct ltt_kernel_session *ksess = session->kernel_session;
2937
2938 total_streams += ksess->stream_count_global;
2939 }
2940
2941 if (session->ust_session) {
2942 struct ltt_ust_session *usess = session->ust_session;
2943
2944 total_streams += ust_app_get_nb_stream(usess);
2945 }
2946
2947 return total_streams;
2948 }
2949
2950 /*
2951 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2952 *
2953 * The wait parameter is ignored so this call always wait for the snapshot to
2954 * complete before returning.
2955 *
2956 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2957 */
2958 int cmd_snapshot_record(struct ltt_session *session,
2959 struct lttng_snapshot_output *output, int wait)
2960 {
2961 int ret = LTTNG_OK;
2962 unsigned int use_tmp_output = 0;
2963 struct snapshot_output tmp_output;
2964 unsigned int nb_streams, snapshot_success = 0;
2965
2966 assert(session);
2967
2968 DBG("Cmd snapshot record for session %s", session->name);
2969
2970 /*
2971 * Permission denied to create an output if the session is not
2972 * set in no output mode.
2973 */
2974 if (session->output_traces) {
2975 ret = LTTNG_ERR_EPERM;
2976 goto error;
2977 }
2978
2979 /* The session needs to be started at least once. */
2980 if (!session->started) {
2981 ret = LTTNG_ERR_START_SESSION_ONCE;
2982 goto error;
2983 }
2984
2985 /* Use temporary output for the session. */
2986 if (output && *output->ctrl_url != '\0') {
2987 ret = snapshot_output_init(output->max_size, output->name,
2988 output->ctrl_url, output->data_url, session->consumer,
2989 &tmp_output, NULL);
2990 if (ret < 0) {
2991 if (ret == -ENOMEM) {
2992 ret = LTTNG_ERR_NOMEM;
2993 } else {
2994 ret = LTTNG_ERR_INVALID;
2995 }
2996 goto error;
2997 }
2998 /* Use the global session count for the temporary snapshot. */
2999 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3000 use_tmp_output = 1;
3001 }
3002
3003 /*
3004 * Get the total number of stream of that session which is used by the
3005 * maximum size of the snapshot feature.
3006 */
3007 nb_streams = get_total_nb_stream(session);
3008
3009 if (session->kernel_session) {
3010 struct ltt_kernel_session *ksess = session->kernel_session;
3011
3012 if (use_tmp_output) {
3013 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3014 wait, nb_streams);
3015 if (ret != LTTNG_OK) {
3016 goto error;
3017 }
3018 snapshot_success = 1;
3019 } else {
3020 struct snapshot_output *sout;
3021 struct lttng_ht_iter iter;
3022
3023 rcu_read_lock();
3024 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3025 &iter.iter, sout, node.node) {
3026 /*
3027 * Make a local copy of the output and assign the possible
3028 * temporary value given by the caller.
3029 */
3030 memset(&tmp_output, 0, sizeof(tmp_output));
3031 memcpy(&tmp_output, sout, sizeof(tmp_output));
3032
3033 /* Use temporary max size. */
3034 if (output->max_size != (uint64_t) -1ULL) {
3035 tmp_output.max_size = output->max_size;
3036 }
3037
3038 /* Use temporary name. */
3039 if (*output->name != '\0') {
3040 strncpy(tmp_output.name, output->name,
3041 sizeof(tmp_output.name));
3042 }
3043
3044 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3045
3046 ret = record_kernel_snapshot(ksess, &tmp_output,
3047 session, wait, nb_streams);
3048 if (ret != LTTNG_OK) {
3049 rcu_read_unlock();
3050 goto error;
3051 }
3052 snapshot_success = 1;
3053 }
3054 rcu_read_unlock();
3055 }
3056 }
3057
3058 if (session->ust_session) {
3059 struct ltt_ust_session *usess = session->ust_session;
3060
3061 if (use_tmp_output) {
3062 ret = record_ust_snapshot(usess, &tmp_output, session,
3063 wait, nb_streams);
3064 if (ret != LTTNG_OK) {
3065 goto error;
3066 }
3067 snapshot_success = 1;
3068 } else {
3069 struct snapshot_output *sout;
3070 struct lttng_ht_iter iter;
3071
3072 rcu_read_lock();
3073 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3074 &iter.iter, sout, node.node) {
3075 /*
3076 * Make a local copy of the output and assign the possible
3077 * temporary value given by the caller.
3078 */
3079 memset(&tmp_output, 0, sizeof(tmp_output));
3080 memcpy(&tmp_output, sout, sizeof(tmp_output));
3081
3082 /* Use temporary max size. */
3083 if (output->max_size != (uint64_t) -1ULL) {
3084 tmp_output.max_size = output->max_size;
3085 }
3086
3087 /* Use temporary name. */
3088 if (*output->name != '\0') {
3089 strncpy(tmp_output.name, output->name,
3090 sizeof(tmp_output.name));
3091 }
3092
3093 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3094
3095 ret = record_ust_snapshot(usess, &tmp_output, session,
3096 wait, nb_streams);
3097 if (ret != LTTNG_OK) {
3098 rcu_read_unlock();
3099 goto error;
3100 }
3101 snapshot_success = 1;
3102 }
3103 rcu_read_unlock();
3104 }
3105 }
3106
3107 if (snapshot_success) {
3108 session->snapshot.nb_snapshot++;
3109 } else {
3110 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3111 }
3112
3113 error:
3114 return ret;
3115 }
3116
3117 /*
3118 * Init command subsystem.
3119 */
3120 void cmd_init(void)
3121 {
3122 /*
3123 * Set network sequence index to 1 for streams to match a relayd
3124 * socket on the consumer side.
3125 */
3126 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3127 relayd_net_seq_idx = 1;
3128 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3129
3130 DBG("Command subsystem initialized");
3131 }
LTTng 2.0 tools and control repository
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