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[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 agent domain events.
189 *
190 * Return number of events in list on success or else a negative value.
191 */
192 static int list_lttng_agent_events(struct agent *agt,
193 struct lttng_event **events)
194 {
195 int i = 0, ret = 0;
196 unsigned int nb_event = 0;
197 struct agent_event *event;
198 struct lttng_event *tmp_events;
199 struct lttng_ht_iter iter;
200
201 assert(agt);
202 assert(events);
203
204 DBG3("Listing agent events");
205
206 nb_event = lttng_ht_get_count(agt->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 agent events session");
215 ret = -LTTNG_ERR_FATAL;
216 goto error;
217 }
218
219 rcu_read_lock();
220 cds_lfht_for_each_entry(agt->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_agent_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_agent_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 static int validate_event_name(const char *name)
1305 {
1306 int ret = 0;
1307 const char *c = name;
1308 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1309
1310 /*
1311 * Make sure that unescaped wildcards are only used as the last
1312 * character of the event name.
1313 */
1314 while (c < event_name_end) {
1315 switch (*c) {
1316 case '\0':
1317 goto end;
1318 case '\\':
1319 c++;
1320 break;
1321 case '*':
1322 if ((c + 1) < event_name_end && *(c + 1)) {
1323 /* Wildcard is not the last character */
1324 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1325 goto end;
1326 }
1327 default:
1328 break;
1329 }
1330 c++;
1331 }
1332 end:
1333 return ret;
1334 }
1335
1336 /*
1337 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1338 */
1339 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1340 char *channel_name, struct lttng_event *event,
1341 char *filter_expression,
1342 struct lttng_filter_bytecode *filter,
1343 struct lttng_event_exclusion *exclusion,
1344 int wpipe)
1345 {
1346 int ret, channel_created = 0;
1347 struct lttng_channel *attr;
1348
1349 assert(session);
1350 assert(event);
1351 assert(channel_name);
1352
1353 ret = validate_event_name(event->name);
1354 if (ret) {
1355 goto error;
1356 }
1357
1358 rcu_read_lock();
1359
1360 switch (domain->type) {
1361 case LTTNG_DOMAIN_KERNEL:
1362 {
1363 struct ltt_kernel_channel *kchan;
1364
1365 /*
1366 * If a non-default channel has been created in the
1367 * session, explicitely require that -c chan_name needs
1368 * to be provided.
1369 */
1370 if (session->kernel_session->has_non_default_channel
1371 && channel_name[0] == '\0') {
1372 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1373 goto error;
1374 }
1375
1376 kchan = trace_kernel_get_channel_by_name(channel_name,
1377 session->kernel_session);
1378 if (kchan == NULL) {
1379 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1380 LTTNG_BUFFER_GLOBAL);
1381 if (attr == NULL) {
1382 ret = LTTNG_ERR_FATAL;
1383 goto error;
1384 }
1385 strncpy(attr->name, channel_name, sizeof(attr->name));
1386
1387 ret = cmd_enable_channel(session, domain, attr, wpipe);
1388 if (ret != LTTNG_OK) {
1389 free(attr);
1390 goto error;
1391 }
1392 free(attr);
1393
1394 channel_created = 1;
1395 }
1396
1397 /* Get the newly created kernel channel pointer */
1398 kchan = trace_kernel_get_channel_by_name(channel_name,
1399 session->kernel_session);
1400 if (kchan == NULL) {
1401 /* This sould not happen... */
1402 ret = LTTNG_ERR_FATAL;
1403 goto error;
1404 }
1405
1406 ret = event_kernel_enable_tracepoint(kchan, event);
1407 if (ret != LTTNG_OK) {
1408 if (channel_created) {
1409 /* Let's not leak a useless channel. */
1410 kernel_destroy_channel(kchan);
1411 }
1412 goto error;
1413 }
1414
1415 kernel_wait_quiescent(kernel_tracer_fd);
1416 break;
1417 }
1418 case LTTNG_DOMAIN_UST:
1419 {
1420 struct ltt_ust_channel *uchan;
1421 struct ltt_ust_session *usess = session->ust_session;
1422
1423 assert(usess);
1424
1425 /*
1426 * If a non-default channel has been created in the
1427 * session, explicitely require that -c chan_name needs
1428 * to be provided.
1429 */
1430 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1431 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1432 goto error;
1433 }
1434
1435 /* Get channel from global UST domain */
1436 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1437 channel_name);
1438 if (uchan == NULL) {
1439 /* Create default channel */
1440 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1441 usess->buffer_type);
1442 if (attr == NULL) {
1443 ret = LTTNG_ERR_FATAL;
1444 goto error;
1445 }
1446 strncpy(attr->name, channel_name, sizeof(attr->name));
1447
1448 ret = cmd_enable_channel(session, domain, attr, wpipe);
1449 if (ret != LTTNG_OK) {
1450 free(attr);
1451 goto error;
1452 }
1453 free(attr);
1454
1455 /* Get the newly created channel reference back */
1456 uchan = trace_ust_find_channel_by_name(
1457 usess->domain_global.channels, channel_name);
1458 assert(uchan);
1459 }
1460
1461 /* At this point, the session and channel exist on the tracer */
1462 ret = event_ust_enable_tracepoint(usess, uchan, event,
1463 filter_expression, filter, exclusion);
1464 if (ret != LTTNG_OK) {
1465 goto error;
1466 }
1467 break;
1468 }
1469 case LTTNG_DOMAIN_JUL:
1470 {
1471 struct lttng_event uevent;
1472 struct lttng_domain tmp_dom;
1473 struct ltt_ust_session *usess = session->ust_session;
1474
1475 assert(usess);
1476
1477 /* Create the default tracepoint. */
1478 memset(&uevent, 0, sizeof(uevent));
1479 uevent.type = LTTNG_EVENT_TRACEPOINT;
1480 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1481 if (is_root) {
1482 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1483 sizeof(uevent.name));
1484 } else {
1485 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1486 sizeof(uevent.name));
1487 }
1488 uevent.name[sizeof(uevent.name) - 1] = '\0';
1489
1490 /*
1491 * The domain type is changed because we are about to enable the
1492 * default channel and event for the JUL domain that are hardcoded.
1493 * This happens in the UST domain.
1494 */
1495 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1496 tmp_dom.type = LTTNG_DOMAIN_UST;
1497
1498 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1499 &uevent, filter_expression, filter, NULL, wpipe);
1500 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1501 goto error;
1502 }
1503
1504 /* The wild card * means that everything should be enabled. */
1505 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1506 ret = event_agent_enable_all(usess, event, filter);
1507 } else {
1508 ret = event_agent_enable(usess, event, filter);
1509 }
1510 if (ret != LTTNG_OK) {
1511 goto error;
1512 }
1513
1514 break;
1515 }
1516 #if 0
1517 case LTTNG_DOMAIN_UST_EXEC_NAME:
1518 case LTTNG_DOMAIN_UST_PID:
1519 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1520 #endif
1521 default:
1522 ret = LTTNG_ERR_UND;
1523 goto error;
1524 }
1525
1526 ret = LTTNG_OK;
1527
1528 error:
1529 rcu_read_unlock();
1530 return ret;
1531 }
1532
1533 /*
1534 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1535 */
1536 int cmd_enable_event_all(struct ltt_session *session,
1537 struct lttng_domain *domain, char *channel_name, int event_type,
1538 char *filter_expression,
1539 struct lttng_filter_bytecode *filter, int wpipe)
1540 {
1541 int ret;
1542 struct lttng_channel *attr;
1543
1544 assert(session);
1545 assert(channel_name);
1546
1547 rcu_read_lock();
1548
1549 switch (domain->type) {
1550 case LTTNG_DOMAIN_KERNEL:
1551 {
1552 struct ltt_kernel_channel *kchan;
1553
1554 assert(session->kernel_session);
1555
1556 /*
1557 * If a non-default channel has been created in the
1558 * session, explicitely require that -c chan_name needs
1559 * to be provided.
1560 */
1561 if (session->kernel_session->has_non_default_channel
1562 && channel_name[0] == '\0') {
1563 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1564 goto error;
1565 }
1566
1567 kchan = trace_kernel_get_channel_by_name(channel_name,
1568 session->kernel_session);
1569 if (kchan == NULL) {
1570 /* Create default channel */
1571 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1572 LTTNG_BUFFER_GLOBAL);
1573 if (attr == NULL) {
1574 ret = LTTNG_ERR_FATAL;
1575 goto error;
1576 }
1577 strncpy(attr->name, channel_name, sizeof(attr->name));
1578
1579 ret = cmd_enable_channel(session, domain, attr, wpipe);
1580 if (ret != LTTNG_OK) {
1581 free(attr);
1582 goto error;
1583 }
1584 free(attr);
1585
1586 /* Get the newly created kernel channel pointer */
1587 kchan = trace_kernel_get_channel_by_name(channel_name,
1588 session->kernel_session);
1589 assert(kchan);
1590 }
1591
1592 switch (event_type) {
1593 case LTTNG_EVENT_SYSCALL:
1594 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1595 break;
1596 case LTTNG_EVENT_TRACEPOINT:
1597 /*
1598 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1599 * events already registered to the channel.
1600 */
1601 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1602 break;
1603 case LTTNG_EVENT_ALL:
1604 /* Enable syscalls and tracepoints */
1605 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1606 break;
1607 default:
1608 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1609 goto error;
1610 }
1611
1612 /* Manage return value */
1613 if (ret != LTTNG_OK) {
1614 /*
1615 * On error, cmd_enable_channel call will take care of destroying
1616 * the created channel if it was needed.
1617 */
1618 goto error;
1619 }
1620
1621 kernel_wait_quiescent(kernel_tracer_fd);
1622 break;
1623 }
1624 case LTTNG_DOMAIN_UST:
1625 {
1626 struct ltt_ust_channel *uchan;
1627 struct ltt_ust_session *usess = session->ust_session;
1628
1629 assert(usess);
1630
1631 /*
1632 * If a non-default channel has been created in the
1633 * session, explicitely require that -c chan_name needs
1634 * to be provided.
1635 */
1636 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1637 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1638 goto error;
1639 }
1640
1641 /* Get channel from global UST domain */
1642 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1643 channel_name);
1644 if (uchan == NULL) {
1645 /* Create default channel */
1646 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1647 usess->buffer_type);
1648 if (attr == NULL) {
1649 ret = LTTNG_ERR_FATAL;
1650 goto error;
1651 }
1652 strncpy(attr->name, channel_name, sizeof(attr->name));
1653
1654 ret = cmd_enable_channel(session, domain, attr, wpipe);
1655 if (ret != LTTNG_OK) {
1656 free(attr);
1657 goto error;
1658 }
1659 free(attr);
1660
1661 /* Get the newly created channel reference back */
1662 uchan = trace_ust_find_channel_by_name(
1663 usess->domain_global.channels, channel_name);
1664 assert(uchan);
1665 }
1666
1667 /* At this point, the session and channel exist on the tracer */
1668
1669 switch (event_type) {
1670 case LTTNG_EVENT_ALL:
1671 case LTTNG_EVENT_TRACEPOINT:
1672 ret = event_ust_enable_all_tracepoints(usess, uchan,
1673 filter_expression, filter);
1674 if (ret != LTTNG_OK) {
1675 goto error;
1676 }
1677 break;
1678 default:
1679 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1680 goto error;
1681 }
1682
1683 /* Manage return value */
1684 if (ret != LTTNG_OK) {
1685 goto error;
1686 }
1687
1688 break;
1689 }
1690 case LTTNG_DOMAIN_JUL:
1691 {
1692 struct lttng_event uevent, event;
1693 struct lttng_domain tmp_dom;
1694 struct ltt_ust_session *usess = session->ust_session;
1695
1696 assert(usess);
1697
1698 /* Create the default tracepoint. */
1699 uevent.type = LTTNG_EVENT_TRACEPOINT;
1700 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1701 if (is_root) {
1702 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1703 sizeof(uevent.name));
1704 } else {
1705 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1706 sizeof(uevent.name));
1707 }
1708 uevent.name[sizeof(uevent.name) - 1] = '\0';
1709
1710 /*
1711 * The domain type is changed because we are about to enable the
1712 * default channel and event for the JUL domain that are hardcoded.
1713 * This happens in the UST domain.
1714 */
1715 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1716 tmp_dom.type = LTTNG_DOMAIN_UST;
1717
1718 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1719 &uevent, NULL, NULL, NULL, wpipe);
1720 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1721 goto error;
1722 }
1723
1724 event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1725 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1726 strncpy(event.name, "*", sizeof(event.name));
1727 event.name[sizeof(event.name) - 1] = '\0';
1728
1729 ret = event_agent_enable_all(usess, &event, filter);
1730 if (ret != LTTNG_OK) {
1731 goto error;
1732 }
1733
1734 break;
1735 }
1736 #if 0
1737 case LTTNG_DOMAIN_UST_EXEC_NAME:
1738 case LTTNG_DOMAIN_UST_PID:
1739 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1740 #endif
1741 default:
1742 ret = LTTNG_ERR_UND;
1743 goto error;
1744 }
1745
1746 ret = LTTNG_OK;
1747
1748 error:
1749 rcu_read_unlock();
1750 return ret;
1751 }
1752
1753
1754 /*
1755 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1756 */
1757 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1758 {
1759 int ret;
1760 ssize_t nb_events = 0;
1761
1762 switch (domain) {
1763 case LTTNG_DOMAIN_KERNEL:
1764 nb_events = kernel_list_events(kernel_tracer_fd, events);
1765 if (nb_events < 0) {
1766 ret = LTTNG_ERR_KERN_LIST_FAIL;
1767 goto error;
1768 }
1769 break;
1770 case LTTNG_DOMAIN_UST:
1771 nb_events = ust_app_list_events(events);
1772 if (nb_events < 0) {
1773 ret = LTTNG_ERR_UST_LIST_FAIL;
1774 goto error;
1775 }
1776 break;
1777 case LTTNG_DOMAIN_JUL:
1778 nb_events = agent_list_events(events);
1779 if (nb_events < 0) {
1780 ret = LTTNG_ERR_UST_LIST_FAIL;
1781 goto error;
1782 }
1783 break;
1784 default:
1785 ret = LTTNG_ERR_UND;
1786 goto error;
1787 }
1788
1789 return nb_events;
1790
1791 error:
1792 /* Return negative value to differentiate return code */
1793 return -ret;
1794 }
1795
1796 /*
1797 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1798 */
1799 ssize_t cmd_list_tracepoint_fields(int domain,
1800 struct lttng_event_field **fields)
1801 {
1802 int ret;
1803 ssize_t nb_fields = 0;
1804
1805 switch (domain) {
1806 case LTTNG_DOMAIN_UST:
1807 nb_fields = ust_app_list_event_fields(fields);
1808 if (nb_fields < 0) {
1809 ret = LTTNG_ERR_UST_LIST_FAIL;
1810 goto error;
1811 }
1812 break;
1813 case LTTNG_DOMAIN_KERNEL:
1814 default: /* fall-through */
1815 ret = LTTNG_ERR_UND;
1816 goto error;
1817 }
1818
1819 return nb_fields;
1820
1821 error:
1822 /* Return negative value to differentiate return code */
1823 return -ret;
1824 }
1825
1826 /*
1827 * Command LTTNG_START_TRACE processed by the client thread.
1828 */
1829 int cmd_start_trace(struct ltt_session *session)
1830 {
1831 int ret;
1832 unsigned long nb_chan = 0;
1833 struct ltt_kernel_session *ksession;
1834 struct ltt_ust_session *usess;
1835
1836 assert(session);
1837
1838 /* Ease our life a bit ;) */
1839 ksession = session->kernel_session;
1840 usess = session->ust_session;
1841
1842 /* Is the session already started? */
1843 if (session->active) {
1844 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1845 goto error;
1846 }
1847
1848 /*
1849 * Starting a session without channel is useless since after that it's not
1850 * possible to enable channel thus inform the client.
1851 */
1852 if (usess && usess->domain_global.channels) {
1853 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1854 }
1855 if (ksession) {
1856 nb_chan += ksession->channel_count;
1857 }
1858 if (!nb_chan) {
1859 ret = LTTNG_ERR_NO_CHANNEL;
1860 goto error;
1861 }
1862
1863 /* Kernel tracing */
1864 if (ksession != NULL) {
1865 ret = start_kernel_session(ksession, kernel_tracer_fd);
1866 if (ret != LTTNG_OK) {
1867 goto error;
1868 }
1869 }
1870
1871 /* Flag session that trace should start automatically */
1872 if (usess) {
1873 /*
1874 * Even though the start trace might fail, flag this session active so
1875 * other application coming in are started by default.
1876 */
1877 usess->active = 1;
1878
1879 ret = ust_app_start_trace_all(usess);
1880 if (ret < 0) {
1881 ret = LTTNG_ERR_UST_START_FAIL;
1882 goto error;
1883 }
1884 }
1885
1886 /* Flag this after a successful start. */
1887 session->has_been_started = 1;
1888 session->active = 1;
1889
1890 ret = LTTNG_OK;
1891
1892 error:
1893 return ret;
1894 }
1895
1896 /*
1897 * Command LTTNG_STOP_TRACE processed by the client thread.
1898 */
1899 int cmd_stop_trace(struct ltt_session *session)
1900 {
1901 int ret;
1902 struct ltt_kernel_channel *kchan;
1903 struct ltt_kernel_session *ksession;
1904 struct ltt_ust_session *usess;
1905
1906 assert(session);
1907
1908 /* Short cut */
1909 ksession = session->kernel_session;
1910 usess = session->ust_session;
1911
1912 /* Session is not active. Skip everythong and inform the client. */
1913 if (!session->active) {
1914 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1915 goto error;
1916 }
1917
1918 /* Kernel tracer */
1919 if (ksession && ksession->active) {
1920 DBG("Stop kernel tracing");
1921
1922 /* Flush metadata if exist */
1923 if (ksession->metadata_stream_fd >= 0) {
1924 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1925 if (ret < 0) {
1926 ERR("Kernel metadata flush failed");
1927 }
1928 }
1929
1930 /* Flush all buffers before stopping */
1931 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1932 ret = kernel_flush_buffer(kchan);
1933 if (ret < 0) {
1934 ERR("Kernel flush buffer error");
1935 }
1936 }
1937
1938 ret = kernel_stop_session(ksession);
1939 if (ret < 0) {
1940 ret = LTTNG_ERR_KERN_STOP_FAIL;
1941 goto error;
1942 }
1943
1944 kernel_wait_quiescent(kernel_tracer_fd);
1945
1946 ksession->active = 0;
1947 }
1948
1949 if (usess && usess->active) {
1950 /*
1951 * Even though the stop trace might fail, flag this session inactive so
1952 * other application coming in are not started by default.
1953 */
1954 usess->active = 0;
1955
1956 ret = ust_app_stop_trace_all(usess);
1957 if (ret < 0) {
1958 ret = LTTNG_ERR_UST_STOP_FAIL;
1959 goto error;
1960 }
1961 }
1962
1963 /* Flag inactive after a successful stop. */
1964 session->active = 0;
1965 ret = LTTNG_OK;
1966
1967 error:
1968 return ret;
1969 }
1970
1971 /*
1972 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1973 */
1974 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1975 size_t nb_uri, struct lttng_uri *uris)
1976 {
1977 int ret, i;
1978 struct ltt_kernel_session *ksess = session->kernel_session;
1979 struct ltt_ust_session *usess = session->ust_session;
1980 struct consumer_output *consumer = NULL;
1981
1982 assert(session);
1983 assert(uris);
1984 assert(nb_uri > 0);
1985
1986 /* Can't set consumer URI if the session is active. */
1987 if (session->active) {
1988 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1989 goto error;
1990 }
1991
1992 /*
1993 * This case switch makes sure the domain session has a temporary consumer
1994 * so the URL can be set.
1995 */
1996 switch (domain) {
1997 case 0:
1998 /* Code flow error. A session MUST always have a consumer object */
1999 assert(session->consumer);
2000 /*
2001 * The URL will be added to the tracing session consumer instead of a
2002 * specific domain consumer.
2003 */
2004 consumer = session->consumer;
2005 break;
2006 case LTTNG_DOMAIN_KERNEL:
2007 /* Code flow error if we don't have a kernel session here. */
2008 assert(ksess);
2009 assert(ksess->consumer);
2010 consumer = ksess->consumer;
2011 break;
2012 case LTTNG_DOMAIN_UST:
2013 /* Code flow error if we don't have a kernel session here. */
2014 assert(usess);
2015 assert(usess->consumer);
2016 consumer = usess->consumer;
2017 break;
2018 }
2019
2020 for (i = 0; i < nb_uri; i++) {
2021 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
2022 if (ret != LTTNG_OK) {
2023 goto error;
2024 }
2025 }
2026
2027 /*
2028 * Make sure to set the session in output mode after we set URI since a
2029 * session can be created without URL (thus flagged in no output mode).
2030 */
2031 session->output_traces = 1;
2032 if (ksess) {
2033 ksess->output_traces = 1;
2034 } else if (usess) {
2035 usess->output_traces = 1;
2036 }
2037
2038 /* All good! */
2039 ret = LTTNG_OK;
2040
2041 error:
2042 return ret;
2043 }
2044
2045 /*
2046 * Command LTTNG_CREATE_SESSION processed by the client thread.
2047 */
2048 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2049 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2050 {
2051 int ret;
2052 struct ltt_session *session;
2053
2054 assert(name);
2055 assert(creds);
2056
2057 /*
2058 * Verify if the session already exist
2059 *
2060 * XXX: There is no need for the session lock list here since the caller
2061 * (process_client_msg) is holding it. We might want to change that so a
2062 * single command does not lock the entire session list.
2063 */
2064 session = session_find_by_name(name);
2065 if (session != NULL) {
2066 ret = LTTNG_ERR_EXIST_SESS;
2067 goto find_error;
2068 }
2069
2070 /* Create tracing session in the registry */
2071 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2072 LTTNG_SOCK_GET_GID_CRED(creds));
2073 if (ret != LTTNG_OK) {
2074 goto session_error;
2075 }
2076
2077 /*
2078 * Get the newly created session pointer back
2079 *
2080 * XXX: There is no need for the session lock list here since the caller
2081 * (process_client_msg) is holding it. We might want to change that so a
2082 * single command does not lock the entire session list.
2083 */
2084 session = session_find_by_name(name);
2085 assert(session);
2086
2087 session->live_timer = live_timer;
2088 /* Create default consumer output for the session not yet created. */
2089 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2090 if (session->consumer == NULL) {
2091 ret = LTTNG_ERR_FATAL;
2092 goto consumer_error;
2093 }
2094
2095 if (uris) {
2096 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2097 if (ret != LTTNG_OK) {
2098 goto consumer_error;
2099 }
2100 session->output_traces = 1;
2101 } else {
2102 session->output_traces = 0;
2103 DBG2("Session %s created with no output", session->name);
2104 }
2105
2106 session->consumer->enabled = 1;
2107
2108 return LTTNG_OK;
2109
2110 consumer_error:
2111 session_destroy(session);
2112 session_error:
2113 find_error:
2114 return ret;
2115 }
2116
2117 /*
2118 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2119 */
2120 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2121 size_t nb_uri, lttng_sock_cred *creds)
2122 {
2123 int ret;
2124 struct ltt_session *session;
2125 struct snapshot_output *new_output = NULL;
2126
2127 assert(name);
2128 assert(creds);
2129
2130 /*
2131 * Create session in no output mode with URIs set to NULL. The uris we've
2132 * received are for a default snapshot output if one.
2133 */
2134 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2135 if (ret != LTTNG_OK) {
2136 goto error;
2137 }
2138
2139 /* Get the newly created session pointer back. This should NEVER fail. */
2140 session = session_find_by_name(name);
2141 assert(session);
2142
2143 /* Flag session for snapshot mode. */
2144 session->snapshot_mode = 1;
2145
2146 /* Skip snapshot output creation if no URI is given. */
2147 if (nb_uri == 0) {
2148 goto end;
2149 }
2150
2151 new_output = snapshot_output_alloc();
2152 if (!new_output) {
2153 ret = LTTNG_ERR_NOMEM;
2154 goto error_snapshot_alloc;
2155 }
2156
2157 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2158 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2159 if (ret < 0) {
2160 if (ret == -ENOMEM) {
2161 ret = LTTNG_ERR_NOMEM;
2162 } else {
2163 ret = LTTNG_ERR_INVALID;
2164 }
2165 goto error_snapshot;
2166 }
2167
2168 rcu_read_lock();
2169 snapshot_add_output(&session->snapshot, new_output);
2170 rcu_read_unlock();
2171
2172 end:
2173 return LTTNG_OK;
2174
2175 error_snapshot:
2176 snapshot_output_destroy(new_output);
2177 error_snapshot_alloc:
2178 session_destroy(session);
2179 error:
2180 return ret;
2181 }
2182
2183 /*
2184 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2185 */
2186 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2187 {
2188 int ret;
2189 struct ltt_ust_session *usess;
2190 struct ltt_kernel_session *ksess;
2191
2192 /* Safety net */
2193 assert(session);
2194
2195 usess = session->ust_session;
2196 ksess = session->kernel_session;
2197
2198 /* Clean kernel session teardown */
2199 kernel_destroy_session(ksess);
2200
2201 /* UST session teardown */
2202 if (usess) {
2203 /* Close any relayd session */
2204 consumer_output_send_destroy_relayd(usess->consumer);
2205
2206 /* Destroy every UST application related to this session. */
2207 ret = ust_app_destroy_trace_all(usess);
2208 if (ret) {
2209 ERR("Error in ust_app_destroy_trace_all");
2210 }
2211
2212 /* Clean up the rest. */
2213 trace_ust_destroy_session(usess);
2214 }
2215
2216 /*
2217 * Must notify the kernel thread here to update it's poll set in order to
2218 * remove the channel(s)' fd just destroyed.
2219 */
2220 ret = notify_thread_pipe(wpipe);
2221 if (ret < 0) {
2222 PERROR("write kernel poll pipe");
2223 }
2224
2225 ret = session_destroy(session);
2226
2227 return ret;
2228 }
2229
2230 /*
2231 * Command LTTNG_CALIBRATE processed by the client thread.
2232 */
2233 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2234 {
2235 int ret;
2236
2237 switch (domain) {
2238 case LTTNG_DOMAIN_KERNEL:
2239 {
2240 struct lttng_kernel_calibrate kcalibrate;
2241
2242 switch (calibrate->type) {
2243 case LTTNG_CALIBRATE_FUNCTION:
2244 default:
2245 /* Default and only possible calibrate option. */
2246 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2247 break;
2248 }
2249
2250 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2251 if (ret < 0) {
2252 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2253 goto error;
2254 }
2255 break;
2256 }
2257 case LTTNG_DOMAIN_UST:
2258 {
2259 struct lttng_ust_calibrate ucalibrate;
2260
2261 switch (calibrate->type) {
2262 case LTTNG_CALIBRATE_FUNCTION:
2263 default:
2264 /* Default and only possible calibrate option. */
2265 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2266 break;
2267 }
2268
2269 ret = ust_app_calibrate_glb(&ucalibrate);
2270 if (ret < 0) {
2271 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2272 goto error;
2273 }
2274 break;
2275 }
2276 default:
2277 ret = LTTNG_ERR_UND;
2278 goto error;
2279 }
2280
2281 ret = LTTNG_OK;
2282
2283 error:
2284 return ret;
2285 }
2286
2287 /*
2288 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2289 */
2290 int cmd_register_consumer(struct ltt_session *session, int domain,
2291 const char *sock_path, struct consumer_data *cdata)
2292 {
2293 int ret, sock;
2294 struct consumer_socket *socket = NULL;
2295
2296 assert(session);
2297 assert(cdata);
2298 assert(sock_path);
2299
2300 switch (domain) {
2301 case LTTNG_DOMAIN_KERNEL:
2302 {
2303 struct ltt_kernel_session *ksess = session->kernel_session;
2304
2305 assert(ksess);
2306
2307 /* Can't register a consumer if there is already one */
2308 if (ksess->consumer_fds_sent != 0) {
2309 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2310 goto error;
2311 }
2312
2313 sock = lttcomm_connect_unix_sock(sock_path);
2314 if (sock < 0) {
2315 ret = LTTNG_ERR_CONNECT_FAIL;
2316 goto error;
2317 }
2318 cdata->cmd_sock = sock;
2319
2320 socket = consumer_allocate_socket(&cdata->cmd_sock);
2321 if (socket == NULL) {
2322 ret = close(sock);
2323 if (ret < 0) {
2324 PERROR("close register consumer");
2325 }
2326 cdata->cmd_sock = -1;
2327 ret = LTTNG_ERR_FATAL;
2328 goto error;
2329 }
2330
2331 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2332 if (socket->lock == NULL) {
2333 PERROR("zmalloc pthread mutex");
2334 ret = LTTNG_ERR_FATAL;
2335 goto error;
2336 }
2337 pthread_mutex_init(socket->lock, NULL);
2338 socket->registered = 1;
2339
2340 rcu_read_lock();
2341 consumer_add_socket(socket, ksess->consumer);
2342 rcu_read_unlock();
2343
2344 pthread_mutex_lock(&cdata->pid_mutex);
2345 cdata->pid = -1;
2346 pthread_mutex_unlock(&cdata->pid_mutex);
2347
2348 break;
2349 }
2350 default:
2351 /* TODO: Userspace tracing */
2352 ret = LTTNG_ERR_UND;
2353 goto error;
2354 }
2355
2356 return LTTNG_OK;
2357
2358 error:
2359 if (socket) {
2360 consumer_destroy_socket(socket);
2361 }
2362 return ret;
2363 }
2364
2365 /*
2366 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2367 */
2368 ssize_t cmd_list_domains(struct ltt_session *session,
2369 struct lttng_domain **domains)
2370 {
2371 int ret, index = 0;
2372 ssize_t nb_dom = 0;
2373
2374 if (session->kernel_session != NULL) {
2375 DBG3("Listing domains found kernel domain");
2376 nb_dom++;
2377 }
2378
2379 if (session->ust_session != NULL) {
2380 DBG3("Listing domains found UST global domain");
2381 nb_dom++;
2382
2383 if (session->ust_session->agent.being_used) {
2384 nb_dom++;
2385 }
2386 }
2387
2388 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2389 if (*domains == NULL) {
2390 ret = LTTNG_ERR_FATAL;
2391 goto error;
2392 }
2393
2394 if (session->kernel_session != NULL) {
2395 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2396 index++;
2397 }
2398
2399 if (session->ust_session != NULL) {
2400 (*domains)[index].type = LTTNG_DOMAIN_UST;
2401 (*domains)[index].buf_type = session->ust_session->buffer_type;
2402 index++;
2403
2404 if (session->ust_session->agent.being_used) {
2405 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2406 (*domains)[index].buf_type = session->ust_session->buffer_type;
2407 index++;
2408 }
2409 }
2410
2411 return nb_dom;
2412
2413 error:
2414 /* Return negative value to differentiate return code */
2415 return -ret;
2416 }
2417
2418
2419 /*
2420 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2421 */
2422 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2423 struct lttng_channel **channels)
2424 {
2425 int ret;
2426 ssize_t nb_chan = 0;
2427
2428 switch (domain) {
2429 case LTTNG_DOMAIN_KERNEL:
2430 if (session->kernel_session != NULL) {
2431 nb_chan = session->kernel_session->channel_count;
2432 }
2433 DBG3("Number of kernel channels %zd", nb_chan);
2434 if (nb_chan <= 0) {
2435 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2436 }
2437 break;
2438 case LTTNG_DOMAIN_UST:
2439 if (session->ust_session != NULL) {
2440 nb_chan = lttng_ht_get_count(
2441 session->ust_session->domain_global.channels);
2442 }
2443 DBG3("Number of UST global channels %zd", nb_chan);
2444 if (nb_chan <= 0) {
2445 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2446 }
2447 break;
2448 default:
2449 *channels = NULL;
2450 ret = LTTNG_ERR_UND;
2451 goto error;
2452 }
2453
2454 if (nb_chan > 0) {
2455 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2456 if (*channels == NULL) {
2457 ret = LTTNG_ERR_FATAL;
2458 goto error;
2459 }
2460
2461 list_lttng_channels(domain, session, *channels);
2462 } else {
2463 *channels = NULL;
2464 /* Ret value was set in the domain switch case */
2465 goto error;
2466 }
2467
2468 return nb_chan;
2469
2470 error:
2471 /* Return negative value to differentiate return code */
2472 return -ret;
2473 }
2474
2475 /*
2476 * Command LTTNG_LIST_EVENTS processed by the client thread.
2477 */
2478 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2479 char *channel_name, struct lttng_event **events)
2480 {
2481 int ret = 0;
2482 ssize_t nb_event = 0;
2483
2484 switch (domain) {
2485 case LTTNG_DOMAIN_KERNEL:
2486 if (session->kernel_session != NULL) {
2487 nb_event = list_lttng_kernel_events(channel_name,
2488 session->kernel_session, events);
2489 }
2490 break;
2491 case LTTNG_DOMAIN_UST:
2492 {
2493 if (session->ust_session != NULL) {
2494 nb_event = list_lttng_ust_global_events(channel_name,
2495 &session->ust_session->domain_global, events);
2496 }
2497 break;
2498 }
2499 case LTTNG_DOMAIN_JUL:
2500 if (session->ust_session) {
2501 nb_event = list_lttng_agent_events(
2502 &session->ust_session->agent, events);
2503 }
2504 break;
2505 default:
2506 ret = LTTNG_ERR_UND;
2507 goto error;
2508 }
2509
2510 return nb_event;
2511
2512 error:
2513 /* Return negative value to differentiate return code */
2514 return -ret;
2515 }
2516
2517 /*
2518 * Using the session list, filled a lttng_session array to send back to the
2519 * client for session listing.
2520 *
2521 * The session list lock MUST be acquired before calling this function. Use
2522 * session_lock_list() and session_unlock_list().
2523 */
2524 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2525 gid_t gid)
2526 {
2527 int ret;
2528 unsigned int i = 0;
2529 struct ltt_session *session;
2530 struct ltt_session_list *list = session_get_list();
2531
2532 DBG("Getting all available session for UID %d GID %d",
2533 uid, gid);
2534 /*
2535 * Iterate over session list and append data after the control struct in
2536 * the buffer.
2537 */
2538 cds_list_for_each_entry(session, &list->head, list) {
2539 /*
2540 * Only list the sessions the user can control.
2541 */
2542 if (!session_access_ok(session, uid, gid)) {
2543 continue;
2544 }
2545
2546 struct ltt_kernel_session *ksess = session->kernel_session;
2547 struct ltt_ust_session *usess = session->ust_session;
2548
2549 if (session->consumer->type == CONSUMER_DST_NET ||
2550 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2551 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2552 ret = build_network_session_path(sessions[i].path,
2553 sizeof(sessions[i].path), session);
2554 } else {
2555 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2556 session->consumer->dst.trace_path);
2557 }
2558 if (ret < 0) {
2559 PERROR("snprintf session path");
2560 continue;
2561 }
2562
2563 strncpy(sessions[i].name, session->name, NAME_MAX);
2564 sessions[i].name[NAME_MAX - 1] = '\0';
2565 sessions[i].enabled = session->active;
2566 sessions[i].snapshot_mode = session->snapshot_mode;
2567 sessions[i].live_timer_interval = session->live_timer;
2568 i++;
2569 }
2570 }
2571
2572 /*
2573 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2574 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2575 */
2576 int cmd_data_pending(struct ltt_session *session)
2577 {
2578 int ret;
2579 struct ltt_kernel_session *ksess = session->kernel_session;
2580 struct ltt_ust_session *usess = session->ust_session;
2581
2582 assert(session);
2583
2584 /* Session MUST be stopped to ask for data availability. */
2585 if (session->active) {
2586 ret = LTTNG_ERR_SESSION_STARTED;
2587 goto error;
2588 } else {
2589 /*
2590 * If stopped, just make sure we've started before else the above call
2591 * will always send that there is data pending.
2592 *
2593 * The consumer assumes that when the data pending command is received,
2594 * the trace has been started before or else no output data is written
2595 * by the streams which is a condition for data pending. So, this is
2596 * *VERY* important that we don't ask the consumer before a start
2597 * trace.
2598 */
2599 if (!session->has_been_started) {
2600 ret = 0;
2601 goto error;
2602 }
2603 }
2604
2605 if (ksess && ksess->consumer) {
2606 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2607 if (ret == 1) {
2608 /* Data is still being extracted for the kernel. */
2609 goto error;
2610 }
2611 }
2612
2613 if (usess && usess->consumer) {
2614 ret = consumer_is_data_pending(usess->id, usess->consumer);
2615 if (ret == 1) {
2616 /* Data is still being extracted for the kernel. */
2617 goto error;
2618 }
2619 }
2620
2621 /* Data is ready to be read by a viewer */
2622 ret = 0;
2623
2624 error:
2625 return ret;
2626 }
2627
2628 /*
2629 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2630 *
2631 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2632 */
2633 int cmd_snapshot_add_output(struct ltt_session *session,
2634 struct lttng_snapshot_output *output, uint32_t *id)
2635 {
2636 int ret;
2637 struct snapshot_output *new_output;
2638
2639 assert(session);
2640 assert(output);
2641
2642 DBG("Cmd snapshot add output for session %s", session->name);
2643
2644 /*
2645 * Permission denied to create an output if the session is not
2646 * set in no output mode.
2647 */
2648 if (session->output_traces) {
2649 ret = LTTNG_ERR_EPERM;
2650 goto error;
2651 }
2652
2653 /* Only one output is allowed until we have the "tee" feature. */
2654 if (session->snapshot.nb_output == 1) {
2655 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2656 goto error;
2657 }
2658
2659 new_output = snapshot_output_alloc();
2660 if (!new_output) {
2661 ret = LTTNG_ERR_NOMEM;
2662 goto error;
2663 }
2664
2665 ret = snapshot_output_init(output->max_size, output->name,
2666 output->ctrl_url, output->data_url, session->consumer, new_output,
2667 &session->snapshot);
2668 if (ret < 0) {
2669 if (ret == -ENOMEM) {
2670 ret = LTTNG_ERR_NOMEM;
2671 } else {
2672 ret = LTTNG_ERR_INVALID;
2673 }
2674 goto free_error;
2675 }
2676
2677 rcu_read_lock();
2678 snapshot_add_output(&session->snapshot, new_output);
2679 if (id) {
2680 *id = new_output->id;
2681 }
2682 rcu_read_unlock();
2683
2684 return LTTNG_OK;
2685
2686 free_error:
2687 snapshot_output_destroy(new_output);
2688 error:
2689 return ret;
2690 }
2691
2692 /*
2693 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2694 *
2695 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2696 */
2697 int cmd_snapshot_del_output(struct ltt_session *session,
2698 struct lttng_snapshot_output *output)
2699 {
2700 int ret;
2701 struct snapshot_output *sout = NULL;
2702
2703 assert(session);
2704 assert(output);
2705
2706 rcu_read_lock();
2707
2708 /*
2709 * Permission denied to create an output if the session is not
2710 * set in no output mode.
2711 */
2712 if (session->output_traces) {
2713 ret = LTTNG_ERR_EPERM;
2714 goto error;
2715 }
2716
2717 if (output->id) {
2718 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2719 session->name);
2720 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2721 } else if (*output->name != '\0') {
2722 DBG("Cmd snapshot del output name %s for session %s", output->name,
2723 session->name);
2724 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2725 }
2726 if (!sout) {
2727 ret = LTTNG_ERR_INVALID;
2728 goto error;
2729 }
2730
2731 snapshot_delete_output(&session->snapshot, sout);
2732 snapshot_output_destroy(sout);
2733 ret = LTTNG_OK;
2734
2735 error:
2736 rcu_read_unlock();
2737 return ret;
2738 }
2739
2740 /*
2741 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2742 *
2743 * If no output is available, outputs is untouched and 0 is returned.
2744 *
2745 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2746 */
2747 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2748 struct lttng_snapshot_output **outputs)
2749 {
2750 int ret, idx = 0;
2751 struct lttng_snapshot_output *list;
2752 struct lttng_ht_iter iter;
2753 struct snapshot_output *output;
2754
2755 assert(session);
2756 assert(outputs);
2757
2758 DBG("Cmd snapshot list outputs for session %s", session->name);
2759
2760 /*
2761 * Permission denied to create an output if the session is not
2762 * set in no output mode.
2763 */
2764 if (session->output_traces) {
2765 ret = LTTNG_ERR_EPERM;
2766 goto error;
2767 }
2768
2769 if (session->snapshot.nb_output == 0) {
2770 ret = 0;
2771 goto error;
2772 }
2773
2774 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2775 if (!list) {
2776 ret = LTTNG_ERR_NOMEM;
2777 goto error;
2778 }
2779
2780 /* Copy list from session to the new list object. */
2781 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2782 output, node.node) {
2783 assert(output->consumer);
2784 list[idx].id = output->id;
2785 list[idx].max_size = output->max_size;
2786 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2787 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2788 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2789 sizeof(list[idx].ctrl_url));
2790 } else {
2791 /* Control URI. */
2792 ret = uri_to_str_url(&output->consumer->dst.net.control,
2793 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2794 if (ret < 0) {
2795 ret = LTTNG_ERR_NOMEM;
2796 goto free_error;
2797 }
2798
2799 /* Data URI. */
2800 ret = uri_to_str_url(&output->consumer->dst.net.data,
2801 list[idx].data_url, sizeof(list[idx].data_url));
2802 if (ret < 0) {
2803 ret = LTTNG_ERR_NOMEM;
2804 goto free_error;
2805 }
2806 }
2807 idx++;
2808 }
2809
2810 *outputs = list;
2811 return session->snapshot.nb_output;
2812
2813 free_error:
2814 free(list);
2815 error:
2816 return -ret;
2817 }
2818
2819 /*
2820 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2821 * snapshot output is *not* set with a remote destination.
2822 *
2823 * Return 0 on success or a LTTNG_ERR code.
2824 */
2825 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2826 struct snapshot_output *snap_output, struct ltt_session *session)
2827 {
2828 int ret = LTTNG_OK;
2829 struct lttng_ht_iter iter;
2830 struct consumer_socket *socket;
2831
2832 assert(consumer);
2833 assert(snap_output);
2834 assert(session);
2835
2836 DBG2("Set relayd object from snapshot output");
2837
2838 /* Ignore if snapshot consumer output is not network. */
2839 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2840 goto error;
2841 }
2842
2843 /*
2844 * For each consumer socket, create and send the relayd object of the
2845 * snapshot output.
2846 */
2847 rcu_read_lock();
2848 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2849 socket, node.node) {
2850 ret = send_consumer_relayd_sockets(0, session->id,
2851 snap_output->consumer, socket,
2852 session->name, session->hostname,
2853 session->live_timer);
2854 if (ret != LTTNG_OK) {
2855 rcu_read_unlock();
2856 goto error;
2857 }
2858 }
2859 rcu_read_unlock();
2860
2861 error:
2862 return ret;
2863 }
2864
2865 /*
2866 * Record a kernel snapshot.
2867 *
2868 * Return LTTNG_OK on success or a LTTNG_ERR code.
2869 */
2870 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2871 struct snapshot_output *output, struct ltt_session *session,
2872 int wait, uint64_t max_stream_size)
2873 {
2874 int ret;
2875
2876 assert(ksess);
2877 assert(output);
2878 assert(session);
2879
2880 /* Get the datetime for the snapshot output directory. */
2881 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2882 sizeof(output->datetime));
2883 if (!ret) {
2884 ret = LTTNG_ERR_INVALID;
2885 goto error;
2886 }
2887
2888 /*
2889 * Copy kernel session sockets so we can communicate with the right
2890 * consumer for the snapshot record command.
2891 */
2892 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2893 if (ret < 0) {
2894 ret = LTTNG_ERR_NOMEM;
2895 goto error;
2896 }
2897
2898 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2899 if (ret != LTTNG_OK) {
2900 goto error_snapshot;
2901 }
2902
2903 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2904 if (ret != LTTNG_OK) {
2905 goto error_snapshot;
2906 }
2907
2908 ret = LTTNG_OK;
2909
2910 error_snapshot:
2911 /* Clean up copied sockets so this output can use some other later on. */
2912 consumer_destroy_output_sockets(output->consumer);
2913 error:
2914 return ret;
2915 }
2916
2917 /*
2918 * Record a UST snapshot.
2919 *
2920 * Return 0 on success or a LTTNG_ERR error code.
2921 */
2922 static int record_ust_snapshot(struct ltt_ust_session *usess,
2923 struct snapshot_output *output, struct ltt_session *session,
2924 int wait, uint64_t max_stream_size)
2925 {
2926 int ret;
2927
2928 assert(usess);
2929 assert(output);
2930 assert(session);
2931
2932 /* Get the datetime for the snapshot output directory. */
2933 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2934 sizeof(output->datetime));
2935 if (!ret) {
2936 ret = LTTNG_ERR_INVALID;
2937 goto error;
2938 }
2939
2940 /*
2941 * Copy UST session sockets so we can communicate with the right
2942 * consumer for the snapshot record command.
2943 */
2944 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2945 if (ret < 0) {
2946 ret = LTTNG_ERR_NOMEM;
2947 goto error;
2948 }
2949
2950 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2951 if (ret != LTTNG_OK) {
2952 goto error_snapshot;
2953 }
2954
2955 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
2956 if (ret < 0) {
2957 switch (-ret) {
2958 case EINVAL:
2959 ret = LTTNG_ERR_INVALID;
2960 break;
2961 case ENODATA:
2962 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2963 break;
2964 default:
2965 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2966 break;
2967 }
2968 goto error_snapshot;
2969 }
2970
2971 ret = LTTNG_OK;
2972
2973 error_snapshot:
2974 /* Clean up copied sockets so this output can use some other later on. */
2975 consumer_destroy_output_sockets(output->consumer);
2976 error:
2977 return ret;
2978 }
2979
2980 /*
2981 * Return the biggest subbuffer size of all channels in the given session.
2982 */
2983 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
2984 {
2985 uint64_t max_size = 0;
2986
2987 assert(session);
2988
2989 if (session->kernel_session) {
2990 struct ltt_kernel_channel *chan;
2991 struct ltt_kernel_session *ksess = session->kernel_session;
2992
2993 /*
2994 * For each channel, add to the max size the size of each subbuffer
2995 * multiplied by their sized.
2996 */
2997 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
2998 if (chan->channel->attr.subbuf_size > max_size) {
2999 max_size = chan->channel->attr.subbuf_size;
3000 }
3001 }
3002 }
3003
3004 if (session->ust_session) {
3005 struct lttng_ht_iter iter;
3006 struct ltt_ust_channel *uchan;
3007 struct ltt_ust_session *usess = session->ust_session;
3008
3009 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
3010 uchan, node.node) {
3011 if (uchan->attr.subbuf_size > max_size) {
3012 max_size = uchan->attr.subbuf_size;
3013 }
3014 }
3015 }
3016
3017 return max_size;
3018 }
3019
3020 /*
3021 * Returns the total number of streams for a session or a negative value
3022 * on error.
3023 */
3024 static unsigned int get_session_nb_streams(struct ltt_session *session)
3025 {
3026 unsigned int total_streams = 0;
3027
3028 if (session->kernel_session) {
3029 struct ltt_kernel_session *ksess = session->kernel_session;
3030
3031 total_streams += ksess->stream_count_global;
3032 }
3033
3034 if (session->ust_session) {
3035 struct ltt_ust_session *usess = session->ust_session;
3036
3037 total_streams += ust_app_get_nb_stream(usess);
3038 }
3039
3040 return total_streams;
3041 }
3042
3043 /*
3044 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3045 *
3046 * The wait parameter is ignored so this call always wait for the snapshot to
3047 * complete before returning.
3048 *
3049 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3050 */
3051 int cmd_snapshot_record(struct ltt_session *session,
3052 struct lttng_snapshot_output *output, int wait)
3053 {
3054 int ret = LTTNG_OK;
3055 unsigned int use_tmp_output = 0;
3056 struct snapshot_output tmp_output;
3057 unsigned int nb_streams, snapshot_success = 0;
3058 uint64_t session_max_size = 0, max_stream_size = 0;
3059
3060 assert(session);
3061
3062 DBG("Cmd snapshot record for session %s", session->name);
3063
3064 /*
3065 * Permission denied to create an output if the session is not
3066 * set in no output mode.
3067 */
3068 if (session->output_traces) {
3069 ret = LTTNG_ERR_EPERM;
3070 goto error;
3071 }
3072
3073 /* The session needs to be started at least once. */
3074 if (!session->has_been_started) {
3075 ret = LTTNG_ERR_START_SESSION_ONCE;
3076 goto error;
3077 }
3078
3079 /* Use temporary output for the session. */
3080 if (output && *output->ctrl_url != '\0') {
3081 ret = snapshot_output_init(output->max_size, output->name,
3082 output->ctrl_url, output->data_url, session->consumer,
3083 &tmp_output, NULL);
3084 if (ret < 0) {
3085 if (ret == -ENOMEM) {
3086 ret = LTTNG_ERR_NOMEM;
3087 } else {
3088 ret = LTTNG_ERR_INVALID;
3089 }
3090 goto error;
3091 }
3092 /* Use the global session count for the temporary snapshot. */
3093 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3094 use_tmp_output = 1;
3095 }
3096
3097 /*
3098 * Get the session maximum size for a snapshot meaning it will compute the
3099 * size of all streams from all domain.
3100 */
3101 max_stream_size = get_session_max_subbuf_size(session);
3102
3103 nb_streams = get_session_nb_streams(session);
3104 if (nb_streams) {
3105 /*
3106 * The maximum size of the snapshot is the number of streams multiplied
3107 * by the biggest subbuf size of all channels in a session which is the
3108 * maximum stream size available for each stream. The session max size
3109 * is now checked against the snapshot max size value given by the user
3110 * and if lower, an error is returned.
3111 */
3112 session_max_size = max_stream_size * nb_streams;
3113 }
3114
3115 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3116 session_max_size, max_stream_size);
3117
3118 /*
3119 * If we use a temporary output, check right away if the max size fits else
3120 * for each output the max size will be checked.
3121 */
3122 if (use_tmp_output &&
3123 (tmp_output.max_size != 0 &&
3124 tmp_output.max_size < session_max_size)) {
3125 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3126 goto error;
3127 }
3128
3129 if (session->kernel_session) {
3130 struct ltt_kernel_session *ksess = session->kernel_session;
3131
3132 if (use_tmp_output) {
3133 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3134 wait, max_stream_size);
3135 if (ret != LTTNG_OK) {
3136 goto error;
3137 }
3138 snapshot_success = 1;
3139 } else {
3140 struct snapshot_output *sout;
3141 struct lttng_ht_iter iter;
3142
3143 rcu_read_lock();
3144 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3145 &iter.iter, sout, node.node) {
3146 /*
3147 * Make a local copy of the output and assign the possible
3148 * temporary value given by the caller.
3149 */
3150 memset(&tmp_output, 0, sizeof(tmp_output));
3151 memcpy(&tmp_output, sout, sizeof(tmp_output));
3152
3153 /* Use temporary max size. */
3154 if (output->max_size != (uint64_t) -1ULL) {
3155 tmp_output.max_size = output->max_size;
3156 }
3157
3158 if (tmp_output.max_size != 0 &&
3159 tmp_output.max_size < session_max_size) {
3160 rcu_read_unlock();
3161 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3162 goto error;
3163 }
3164
3165 /* Use temporary name. */
3166 if (*output->name != '\0') {
3167 strncpy(tmp_output.name, output->name,
3168 sizeof(tmp_output.name));
3169 }
3170
3171 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3172
3173 ret = record_kernel_snapshot(ksess, &tmp_output,
3174 session, wait, max_stream_size);
3175 if (ret != LTTNG_OK) {
3176 rcu_read_unlock();
3177 goto error;
3178 }
3179 snapshot_success = 1;
3180 }
3181 rcu_read_unlock();
3182 }
3183 }
3184
3185 if (session->ust_session) {
3186 struct ltt_ust_session *usess = session->ust_session;
3187
3188 if (use_tmp_output) {
3189 ret = record_ust_snapshot(usess, &tmp_output, session,
3190 wait, max_stream_size);
3191 if (ret != LTTNG_OK) {
3192 goto error;
3193 }
3194 snapshot_success = 1;
3195 } else {
3196 struct snapshot_output *sout;
3197 struct lttng_ht_iter iter;
3198
3199 rcu_read_lock();
3200 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3201 &iter.iter, sout, node.node) {
3202 /*
3203 * Make a local copy of the output and assign the possible
3204 * temporary value given by the caller.
3205 */
3206 memset(&tmp_output, 0, sizeof(tmp_output));
3207 memcpy(&tmp_output, sout, sizeof(tmp_output));
3208
3209 /* Use temporary max size. */
3210 if (output->max_size != (uint64_t) -1ULL) {
3211 tmp_output.max_size = output->max_size;
3212 }
3213
3214 if (tmp_output.max_size != 0 &&
3215 tmp_output.max_size < session_max_size) {
3216 rcu_read_unlock();
3217 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3218 goto error;
3219 }
3220
3221 /* Use temporary name. */
3222 if (*output->name != '\0') {
3223 strncpy(tmp_output.name, output->name,
3224 sizeof(tmp_output.name));
3225 }
3226
3227 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3228
3229 ret = record_ust_snapshot(usess, &tmp_output, session,
3230 wait, max_stream_size);
3231 if (ret != LTTNG_OK) {
3232 rcu_read_unlock();
3233 goto error;
3234 }
3235 snapshot_success = 1;
3236 }
3237 rcu_read_unlock();
3238 }
3239 }
3240
3241 if (snapshot_success) {
3242 session->snapshot.nb_snapshot++;
3243 } else {
3244 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3245 }
3246
3247 error:
3248 return ret;
3249 }
3250
3251 /*
3252 * Init command subsystem.
3253 */
3254 void cmd_init(void)
3255 {
3256 /*
3257 * Set network sequence index to 1 for streams to match a relayd
3258 * socket on the consumer side.
3259 */
3260 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3261 relayd_net_seq_idx = 1;
3262 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3263
3264 DBG("Command subsystem initialized");
3265 }
LTTng 2.0 tools and control repository
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