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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 JUL domain events.
189 *
190 * Return number of events in list on success or else a negative value.
191 */
192 static int list_lttng_jul_events(struct jul_domain *dom,
193 struct lttng_event **events)
194 {
195 int i = 0, ret = 0;
196 unsigned int nb_event = 0;
197 struct jul_event *event;
198 struct lttng_event *tmp_events;
199 struct lttng_ht_iter iter;
200
201 assert(dom);
202 assert(events);
203
204 DBG3("Listing JUL events");
205
206 nb_event = lttng_ht_get_count(dom->events);
207 if (nb_event == 0) {
208 ret = nb_event;
209 goto error;
210 }
211
212 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
213 if (!tmp_events) {
214 PERROR("zmalloc JUL events session");
215 ret = -LTTNG_ERR_FATAL;
216 goto error;
217 }
218
219 rcu_read_lock();
220 cds_lfht_for_each_entry(dom->events->ht, &iter.iter, event, node.node) {
221 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
222 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
223 tmp_events[i].enabled = event->enabled;
224 tmp_events[i].loglevel = event->loglevel;
225 tmp_events[i].loglevel_type = event->loglevel_type;
226 i++;
227 }
228 rcu_read_unlock();
229
230 *events = tmp_events;
231 ret = nb_event;
232
233 error:
234 assert(nb_event == i);
235 return ret;
236 }
237
238 /*
239 * Create a list of ust global domain events.
240 */
241 static int list_lttng_ust_global_events(char *channel_name,
242 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
243 {
244 int i = 0, ret = 0;
245 unsigned int nb_event = 0;
246 struct lttng_ht_iter iter;
247 struct lttng_ht_node_str *node;
248 struct ltt_ust_channel *uchan;
249 struct ltt_ust_event *uevent;
250 struct lttng_event *tmp;
251
252 DBG("Listing UST global events for channel %s", channel_name);
253
254 rcu_read_lock();
255
256 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
257 node = lttng_ht_iter_get_node_str(&iter);
258 if (node == NULL) {
259 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
260 goto error;
261 }
262
263 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
264
265 nb_event += lttng_ht_get_count(uchan->events);
266
267 if (nb_event == 0) {
268 ret = nb_event;
269 goto error;
270 }
271
272 DBG3("Listing UST global %d events", nb_event);
273
274 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
275 if (tmp == NULL) {
276 ret = LTTNG_ERR_FATAL;
277 goto error;
278 }
279
280 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
281 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
282 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
283 tmp[i].enabled = uevent->enabled;
284
285 switch (uevent->attr.instrumentation) {
286 case LTTNG_UST_TRACEPOINT:
287 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
288 break;
289 case LTTNG_UST_PROBE:
290 tmp[i].type = LTTNG_EVENT_PROBE;
291 break;
292 case LTTNG_UST_FUNCTION:
293 tmp[i].type = LTTNG_EVENT_FUNCTION;
294 break;
295 }
296
297 tmp[i].loglevel = uevent->attr.loglevel;
298 switch (uevent->attr.loglevel_type) {
299 case LTTNG_UST_LOGLEVEL_ALL:
300 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
301 break;
302 case LTTNG_UST_LOGLEVEL_RANGE:
303 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
304 break;
305 case LTTNG_UST_LOGLEVEL_SINGLE:
306 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
307 break;
308 }
309 if (uevent->filter) {
310 tmp[i].filter = 1;
311 }
312 if (uevent->exclusion) {
313 tmp[i].exclusion = 1;
314 }
315 i++;
316 }
317
318 ret = nb_event;
319 *events = tmp;
320
321 error:
322 rcu_read_unlock();
323 return ret;
324 }
325
326 /*
327 * Fill lttng_event array of all kernel events in the channel.
328 */
329 static int list_lttng_kernel_events(char *channel_name,
330 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
331 {
332 int i = 0, ret;
333 unsigned int nb_event;
334 struct ltt_kernel_event *event;
335 struct ltt_kernel_channel *kchan;
336
337 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
338 if (kchan == NULL) {
339 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
340 goto error;
341 }
342
343 nb_event = kchan->event_count;
344
345 DBG("Listing events for channel %s", kchan->channel->name);
346
347 if (nb_event == 0) {
348 goto end;
349 }
350
351 *events = zmalloc(nb_event * sizeof(struct lttng_event));
352 if (*events == NULL) {
353 ret = LTTNG_ERR_FATAL;
354 goto error;
355 }
356
357 /* Kernel channels */
358 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
359 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
360 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
361 (*events)[i].enabled = event->enabled;
362
363 switch (event->event->instrumentation) {
364 case LTTNG_KERNEL_TRACEPOINT:
365 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
366 break;
367 case LTTNG_KERNEL_KRETPROBE:
368 (*events)[i].type = LTTNG_EVENT_FUNCTION;
369 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
370 sizeof(struct lttng_kernel_kprobe));
371 break;
372 case LTTNG_KERNEL_KPROBE:
373 (*events)[i].type = LTTNG_EVENT_PROBE;
374 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
375 sizeof(struct lttng_kernel_kprobe));
376 break;
377 case LTTNG_KERNEL_FUNCTION:
378 (*events)[i].type = LTTNG_EVENT_FUNCTION;
379 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
380 sizeof(struct lttng_kernel_function));
381 break;
382 case LTTNG_KERNEL_NOOP:
383 (*events)[i].type = LTTNG_EVENT_NOOP;
384 break;
385 case LTTNG_KERNEL_SYSCALL:
386 (*events)[i].type = LTTNG_EVENT_SYSCALL;
387 break;
388 case LTTNG_KERNEL_ALL:
389 assert(0);
390 break;
391 }
392 i++;
393 }
394
395 end:
396 return nb_event;
397
398 error:
399 /* Negate the error code to differentiate the size from an error */
400 return -ret;
401 }
402
403 /*
404 * Add URI so the consumer output object. Set the correct path depending on the
405 * domain adding the default trace directory.
406 */
407 static int add_uri_to_consumer(struct consumer_output *consumer,
408 struct lttng_uri *uri, int domain, const char *session_name)
409 {
410 int ret = LTTNG_OK;
411 const char *default_trace_dir;
412
413 assert(uri);
414
415 if (consumer == NULL) {
416 DBG("No consumer detected. Don't add URI. Stopping.");
417 ret = LTTNG_ERR_NO_CONSUMER;
418 goto error;
419 }
420
421 switch (domain) {
422 case LTTNG_DOMAIN_KERNEL:
423 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
424 break;
425 case LTTNG_DOMAIN_UST:
426 default_trace_dir = DEFAULT_UST_TRACE_DIR;
427 break;
428 default:
429 /*
430 * This case is possible is we try to add the URI to the global tracing
431 * session consumer object which in this case there is no subdir.
432 */
433 default_trace_dir = "";
434 }
435
436 switch (uri->dtype) {
437 case LTTNG_DST_IPV4:
438 case LTTNG_DST_IPV6:
439 DBG2("Setting network URI to consumer");
440
441 if (consumer->type == CONSUMER_DST_NET) {
442 if ((uri->stype == LTTNG_STREAM_CONTROL &&
443 consumer->dst.net.control_isset) ||
444 (uri->stype == LTTNG_STREAM_DATA &&
445 consumer->dst.net.data_isset)) {
446 ret = LTTNG_ERR_URL_EXIST;
447 goto error;
448 }
449 } else {
450 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
451 }
452
453 consumer->type = CONSUMER_DST_NET;
454
455 /* Set URI into consumer output object */
456 ret = consumer_set_network_uri(consumer, uri);
457 if (ret < 0) {
458 ret = -ret;
459 goto error;
460 } else if (ret == 1) {
461 /*
462 * URI was the same in the consumer so we do not append the subdir
463 * again so to not duplicate output dir.
464 */
465 ret = LTTNG_OK;
466 goto error;
467 }
468
469 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
470 ret = consumer_set_subdir(consumer, session_name);
471 if (ret < 0) {
472 ret = LTTNG_ERR_FATAL;
473 goto error;
474 }
475 }
476
477 if (uri->stype == LTTNG_STREAM_CONTROL) {
478 /* On a new subdir, reappend the default trace dir. */
479 strncat(consumer->subdir, default_trace_dir,
480 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
481 DBG3("Append domain trace name to subdir %s", consumer->subdir);
482 }
483
484 break;
485 case LTTNG_DST_PATH:
486 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
487 memset(consumer->dst.trace_path, 0,
488 sizeof(consumer->dst.trace_path));
489 strncpy(consumer->dst.trace_path, uri->dst.path,
490 sizeof(consumer->dst.trace_path));
491 /* Append default trace dir */
492 strncat(consumer->dst.trace_path, default_trace_dir,
493 sizeof(consumer->dst.trace_path) -
494 strlen(consumer->dst.trace_path) - 1);
495 /* Flag consumer as local. */
496 consumer->type = CONSUMER_DST_LOCAL;
497 break;
498 }
499
500 ret = LTTNG_OK;
501
502 error:
503 return ret;
504 }
505
506 /*
507 * Init tracing by creating trace directory and sending fds kernel consumer.
508 */
509 static int init_kernel_tracing(struct ltt_kernel_session *session)
510 {
511 int ret = 0;
512 struct lttng_ht_iter iter;
513 struct consumer_socket *socket;
514
515 assert(session);
516
517 rcu_read_lock();
518
519 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
520 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
521 socket, node.node) {
522 pthread_mutex_lock(socket->lock);
523 ret = kernel_consumer_send_session(socket, session);
524 pthread_mutex_unlock(socket->lock);
525 if (ret < 0) {
526 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
527 goto error;
528 }
529 }
530 }
531
532 error:
533 rcu_read_unlock();
534 return ret;
535 }
536
537 /*
538 * Create a socket to the relayd using the URI.
539 *
540 * On success, the relayd_sock pointer is set to the created socket.
541 * Else, it's stays untouched and a lttcomm error code is returned.
542 */
543 static int create_connect_relayd(struct lttng_uri *uri,
544 struct lttcomm_relayd_sock **relayd_sock)
545 {
546 int ret;
547 struct lttcomm_relayd_sock *rsock;
548
549 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
550 RELAYD_VERSION_COMM_MINOR);
551 if (!rsock) {
552 ret = LTTNG_ERR_FATAL;
553 goto error;
554 }
555
556 /*
557 * Connect to relayd so we can proceed with a session creation. This call
558 * can possibly block for an arbitrary amount of time to set the health
559 * state to be in poll execution.
560 */
561 health_poll_entry();
562 ret = relayd_connect(rsock);
563 health_poll_exit();
564 if (ret < 0) {
565 ERR("Unable to reach lttng-relayd");
566 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
567 goto free_sock;
568 }
569
570 /* Create socket for control stream. */
571 if (uri->stype == LTTNG_STREAM_CONTROL) {
572 DBG3("Creating relayd stream socket from URI");
573
574 /* Check relayd version */
575 ret = relayd_version_check(rsock);
576 if (ret < 0) {
577 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
578 goto close_sock;
579 }
580 } else if (uri->stype == LTTNG_STREAM_DATA) {
581 DBG3("Creating relayd data socket from URI");
582 } else {
583 /* Command is not valid */
584 ERR("Relayd invalid stream type: %d", uri->stype);
585 ret = LTTNG_ERR_INVALID;
586 goto close_sock;
587 }
588
589 *relayd_sock = rsock;
590
591 return LTTNG_OK;
592
593 close_sock:
594 /* The returned value is not useful since we are on an error path. */
595 (void) relayd_close(rsock);
596 free_sock:
597 free(rsock);
598 error:
599 return ret;
600 }
601
602 /*
603 * Connect to the relayd using URI and send the socket to the right consumer.
604 */
605 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
606 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
607 struct consumer_socket *consumer_sock,
608 char *session_name, char *hostname, int session_live_timer)
609 {
610 int ret;
611 struct lttcomm_relayd_sock *rsock = NULL;
612
613 /* Connect to relayd and make version check if uri is the control. */
614 ret = create_connect_relayd(relayd_uri, &rsock);
615 if (ret != LTTNG_OK) {
616 goto error;
617 }
618 assert(rsock);
619
620 /* Set the network sequence index if not set. */
621 if (consumer->net_seq_index == (uint64_t) -1ULL) {
622 pthread_mutex_lock(&relayd_net_seq_idx_lock);
623 /*
624 * Increment net_seq_idx because we are about to transfer the
625 * new relayd socket to the consumer.
626 * Assign unique key so the consumer can match streams.
627 */
628 consumer->net_seq_index = ++relayd_net_seq_idx;
629 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
630 }
631
632 /* Send relayd socket to consumer. */
633 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
634 relayd_uri->stype, session_id,
635 session_name, hostname, session_live_timer);
636 if (ret < 0) {
637 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
638 goto close_sock;
639 }
640
641 /* Flag that the corresponding socket was sent. */
642 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
643 consumer_sock->control_sock_sent = 1;
644 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
645 consumer_sock->data_sock_sent = 1;
646 }
647
648 ret = LTTNG_OK;
649
650 /*
651 * Close socket which was dup on the consumer side. The session daemon does
652 * NOT keep track of the relayd socket(s) once transfer to the consumer.
653 */
654
655 close_sock:
656 (void) relayd_close(rsock);
657 free(rsock);
658
659 error:
660 if (ret != LTTNG_OK) {
661 /*
662 * The consumer output for this session should not be used anymore
663 * since the relayd connection failed thus making any tracing or/and
664 * streaming not usable.
665 */
666 consumer->enabled = 0;
667 }
668 return ret;
669 }
670
671 /*
672 * Send both relayd sockets to a specific consumer and domain. This is a
673 * helper function to facilitate sending the information to the consumer for a
674 * session.
675 */
676 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
677 struct consumer_output *consumer, struct consumer_socket *sock,
678 char *session_name, char *hostname, int session_live_timer)
679 {
680 int ret = LTTNG_OK;
681
682 assert(consumer);
683 assert(sock);
684
685 /* Sending control relayd socket. */
686 if (!sock->control_sock_sent) {
687 ret = send_consumer_relayd_socket(domain, session_id,
688 &consumer->dst.net.control, consumer, sock,
689 session_name, hostname, session_live_timer);
690 if (ret != LTTNG_OK) {
691 goto error;
692 }
693 }
694
695 /* Sending data relayd socket. */
696 if (!sock->data_sock_sent) {
697 ret = send_consumer_relayd_socket(domain, session_id,
698 &consumer->dst.net.data, consumer, sock,
699 session_name, hostname, session_live_timer);
700 if (ret != LTTNG_OK) {
701 goto error;
702 }
703 }
704
705 error:
706 return ret;
707 }
708
709 /*
710 * Setup relayd connections for a tracing session. First creates the socket to
711 * the relayd and send them to the right domain consumer. Consumer type MUST be
712 * network.
713 */
714 int cmd_setup_relayd(struct ltt_session *session)
715 {
716 int ret = LTTNG_OK;
717 struct ltt_ust_session *usess;
718 struct ltt_kernel_session *ksess;
719 struct consumer_socket *socket;
720 struct lttng_ht_iter iter;
721
722 assert(session);
723
724 usess = session->ust_session;
725 ksess = session->kernel_session;
726
727 DBG("Setting relayd for session %s", session->name);
728
729 rcu_read_lock();
730
731 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
732 && usess->consumer->enabled) {
733 /* For each consumer socket, send relayd sockets */
734 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
735 socket, node.node) {
736 pthread_mutex_lock(socket->lock);
737 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
738 usess->consumer, socket,
739 session->name, session->hostname,
740 session->live_timer);
741 pthread_mutex_unlock(socket->lock);
742 if (ret != LTTNG_OK) {
743 goto error;
744 }
745 /* Session is now ready for network streaming. */
746 session->net_handle = 1;
747 }
748 }
749
750 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
751 && ksess->consumer->enabled) {
752 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
753 socket, node.node) {
754 pthread_mutex_lock(socket->lock);
755 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
756 ksess->consumer, socket,
757 session->name, session->hostname,
758 session->live_timer);
759 pthread_mutex_unlock(socket->lock);
760 if (ret != LTTNG_OK) {
761 goto error;
762 }
763 /* Session is now ready for network streaming. */
764 session->net_handle = 1;
765 }
766 }
767
768 error:
769 rcu_read_unlock();
770 return ret;
771 }
772
773 /*
774 * Start a kernel session by opening all necessary streams.
775 */
776 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
777 {
778 int ret;
779 struct ltt_kernel_channel *kchan;
780
781 /* Open kernel metadata */
782 if (ksess->metadata == NULL && ksess->output_traces) {
783 ret = kernel_open_metadata(ksess);
784 if (ret < 0) {
785 ret = LTTNG_ERR_KERN_META_FAIL;
786 goto error;
787 }
788 }
789
790 /* Open kernel metadata stream */
791 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
792 ret = kernel_open_metadata_stream(ksess);
793 if (ret < 0) {
794 ERR("Kernel create metadata stream failed");
795 ret = LTTNG_ERR_KERN_STREAM_FAIL;
796 goto error;
797 }
798 }
799
800 /* For each channel */
801 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
802 if (kchan->stream_count == 0) {
803 ret = kernel_open_channel_stream(kchan);
804 if (ret < 0) {
805 ret = LTTNG_ERR_KERN_STREAM_FAIL;
806 goto error;
807 }
808 /* Update the stream global counter */
809 ksess->stream_count_global += ret;
810 }
811 }
812
813 /* Setup kernel consumer socket and send fds to it */
814 ret = init_kernel_tracing(ksess);
815 if (ret != 0) {
816 ret = LTTNG_ERR_KERN_START_FAIL;
817 goto error;
818 }
819
820 /* This start the kernel tracing */
821 ret = kernel_start_session(ksess);
822 if (ret < 0) {
823 ret = LTTNG_ERR_KERN_START_FAIL;
824 goto error;
825 }
826
827 /* Quiescent wait after starting trace */
828 kernel_wait_quiescent(kernel_tracer_fd);
829
830 ksess->active = 1;
831
832 ret = LTTNG_OK;
833
834 error:
835 return ret;
836 }
837
838 /*
839 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
840 */
841 int cmd_disable_channel(struct ltt_session *session, int domain,
842 char *channel_name)
843 {
844 int ret;
845 struct ltt_ust_session *usess;
846
847 usess = session->ust_session;
848
849 rcu_read_lock();
850
851 switch (domain) {
852 case LTTNG_DOMAIN_KERNEL:
853 {
854 ret = channel_kernel_disable(session->kernel_session,
855 channel_name);
856 if (ret != LTTNG_OK) {
857 goto error;
858 }
859
860 kernel_wait_quiescent(kernel_tracer_fd);
861 break;
862 }
863 case LTTNG_DOMAIN_UST:
864 {
865 struct ltt_ust_channel *uchan;
866 struct lttng_ht *chan_ht;
867
868 chan_ht = usess->domain_global.channels;
869
870 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
871 if (uchan == NULL) {
872 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
873 goto error;
874 }
875
876 ret = channel_ust_disable(usess, uchan);
877 if (ret != LTTNG_OK) {
878 goto error;
879 }
880 break;
881 }
882 #if 0
883 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
884 case LTTNG_DOMAIN_UST_EXEC_NAME:
885 case LTTNG_DOMAIN_UST_PID:
886 #endif
887 default:
888 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
889 goto error;
890 }
891
892 ret = LTTNG_OK;
893
894 error:
895 rcu_read_unlock();
896 return ret;
897 }
898
899 /*
900 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
901 *
902 * The wpipe arguments is used as a notifier for the kernel thread.
903 */
904 int cmd_enable_channel(struct ltt_session *session,
905 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
906 {
907 int ret;
908 struct ltt_ust_session *usess = session->ust_session;
909 struct lttng_ht *chan_ht;
910
911 assert(session);
912 assert(attr);
913 assert(domain);
914
915 DBG("Enabling channel %s for session %s", attr->name, session->name);
916
917 rcu_read_lock();
918
919 /*
920 * Don't try to enable a channel if the session has been started at
921 * some point in time before. The tracer does not allow it.
922 */
923 if (session->has_been_started) {
924 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
925 goto error;
926 }
927
928 /*
929 * If the session is a live session, remove the switch timer, the
930 * live timer does the same thing but sends also synchronisation
931 * beacons for inactive streams.
932 */
933 if (session->live_timer > 0) {
934 attr->attr.live_timer_interval = session->live_timer;
935 attr->attr.switch_timer_interval = 0;
936 }
937
938 /*
939 * The ringbuffer (both in user space and kernel) behave badly in overwrite
940 * mode and with less than 2 subbuf so block it right away and send back an
941 * invalid attribute error.
942 */
943 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
944 ret = LTTNG_ERR_INVALID;
945 goto error;
946 }
947
948 switch (domain->type) {
949 case LTTNG_DOMAIN_KERNEL:
950 {
951 struct ltt_kernel_channel *kchan;
952
953 kchan = trace_kernel_get_channel_by_name(attr->name,
954 session->kernel_session);
955 if (kchan == NULL) {
956 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
957 if (attr->name[0] != '\0') {
958 session->kernel_session->has_non_default_channel = 1;
959 }
960 } else {
961 ret = channel_kernel_enable(session->kernel_session, kchan);
962 }
963
964 if (ret != LTTNG_OK) {
965 goto error;
966 }
967
968 kernel_wait_quiescent(kernel_tracer_fd);
969 break;
970 }
971 case LTTNG_DOMAIN_UST:
972 {
973 struct ltt_ust_channel *uchan;
974
975 chan_ht = usess->domain_global.channels;
976
977 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
978 if (uchan == NULL) {
979 ret = channel_ust_create(usess, attr, domain->buf_type);
980 if (attr->name[0] != '\0') {
981 usess->has_non_default_channel = 1;
982 }
983 } else {
984 ret = channel_ust_enable(usess, uchan);
985 }
986 break;
987 }
988 default:
989 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
990 goto error;
991 }
992
993 error:
994 rcu_read_unlock();
995 return ret;
996 }
997
998
999 /*
1000 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1001 */
1002 int cmd_disable_event(struct ltt_session *session, int domain,
1003 char *channel_name, char *event_name)
1004 {
1005 int ret;
1006
1007 rcu_read_lock();
1008
1009 switch (domain) {
1010 case LTTNG_DOMAIN_KERNEL:
1011 {
1012 struct ltt_kernel_channel *kchan;
1013 struct ltt_kernel_session *ksess;
1014
1015 ksess = session->kernel_session;
1016
1017 /*
1018 * If a non-default channel has been created in the
1019 * session, explicitely require that -c chan_name needs
1020 * to be provided.
1021 */
1022 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1023 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1024 goto error;
1025 }
1026
1027 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1028 if (kchan == NULL) {
1029 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1030 goto error;
1031 }
1032
1033 ret = event_kernel_disable_tracepoint(kchan, event_name);
1034 if (ret != LTTNG_OK) {
1035 goto error;
1036 }
1037
1038 kernel_wait_quiescent(kernel_tracer_fd);
1039 break;
1040 }
1041 case LTTNG_DOMAIN_UST:
1042 {
1043 struct ltt_ust_channel *uchan;
1044 struct ltt_ust_session *usess;
1045
1046 usess = session->ust_session;
1047
1048 /*
1049 * If a non-default channel has been created in the
1050 * session, explicitely require that -c chan_name needs
1051 * to be provided.
1052 */
1053 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1054 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1055 goto error;
1056 }
1057
1058 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1059 channel_name);
1060 if (uchan == NULL) {
1061 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1062 goto error;
1063 }
1064
1065 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1066 if (ret != LTTNG_OK) {
1067 goto error;
1068 }
1069
1070 DBG3("Disable UST event %s in channel %s completed", event_name,
1071 channel_name);
1072 break;
1073 }
1074 case LTTNG_DOMAIN_JUL:
1075 {
1076 struct ltt_ust_session *usess = session->ust_session;
1077
1078 assert(usess);
1079
1080 ret = event_jul_disable(usess, event_name);
1081 if (ret != LTTNG_OK) {
1082 goto error;
1083 }
1084
1085 break;
1086 }
1087 #if 0
1088 case LTTNG_DOMAIN_UST_EXEC_NAME:
1089 case LTTNG_DOMAIN_UST_PID:
1090 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1091 #endif
1092 default:
1093 ret = LTTNG_ERR_UND;
1094 goto error;
1095 }
1096
1097 ret = LTTNG_OK;
1098
1099 error:
1100 rcu_read_unlock();
1101 return ret;
1102 }
1103
1104 /*
1105 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1106 */
1107 int cmd_disable_event_all(struct ltt_session *session, int domain,
1108 char *channel_name)
1109 {
1110 int ret;
1111
1112 rcu_read_lock();
1113
1114 switch (domain) {
1115 case LTTNG_DOMAIN_KERNEL:
1116 {
1117 struct ltt_kernel_session *ksess;
1118 struct ltt_kernel_channel *kchan;
1119
1120 ksess = session->kernel_session;
1121
1122 /*
1123 * If a non-default channel has been created in the
1124 * session, explicitely require that -c chan_name needs
1125 * to be provided.
1126 */
1127 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1128 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1129 goto error;
1130 }
1131
1132 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1133 if (kchan == NULL) {
1134 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1135 goto error;
1136 }
1137
1138 ret = event_kernel_disable_all(kchan);
1139 if (ret != LTTNG_OK) {
1140 goto error;
1141 }
1142
1143 kernel_wait_quiescent(kernel_tracer_fd);
1144 break;
1145 }
1146 case LTTNG_DOMAIN_UST:
1147 {
1148 struct ltt_ust_session *usess;
1149 struct ltt_ust_channel *uchan;
1150
1151 usess = session->ust_session;
1152
1153 /*
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1156 * to be provided.
1157 */
1158 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1159 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1160 goto error;
1161 }
1162
1163 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1164 channel_name);
1165 if (uchan == NULL) {
1166 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1167 goto error;
1168 }
1169
1170 ret = event_ust_disable_all_tracepoints(usess, uchan);
1171 if (ret != 0) {
1172 goto error;
1173 }
1174
1175 DBG3("Disable all UST events in channel %s completed", channel_name);
1176
1177 break;
1178 }
1179 case LTTNG_DOMAIN_JUL:
1180 {
1181 struct ltt_ust_session *usess = session->ust_session;
1182
1183 assert(usess);
1184
1185 ret = event_jul_disable_all(usess);
1186 if (ret != LTTNG_OK) {
1187 goto error;
1188 }
1189
1190 break;
1191 }
1192 #if 0
1193 case LTTNG_DOMAIN_UST_EXEC_NAME:
1194 case LTTNG_DOMAIN_UST_PID:
1195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1196 #endif
1197 default:
1198 ret = LTTNG_ERR_UND;
1199 goto error;
1200 }
1201
1202 ret = LTTNG_OK;
1203
1204 error:
1205 rcu_read_unlock();
1206 return ret;
1207 }
1208
1209 /*
1210 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1211 */
1212 int cmd_add_context(struct ltt_session *session, int domain,
1213 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1214 {
1215 int ret, chan_kern_created = 0, chan_ust_created = 0;
1216
1217 switch (domain) {
1218 case LTTNG_DOMAIN_KERNEL:
1219 assert(session->kernel_session);
1220
1221 if (session->kernel_session->channel_count == 0) {
1222 /* Create default channel */
1223 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1224 if (ret != LTTNG_OK) {
1225 goto error;
1226 }
1227 chan_kern_created = 1;
1228 }
1229 /* Add kernel context to kernel tracer */
1230 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1231 if (ret != LTTNG_OK) {
1232 goto error;
1233 }
1234 break;
1235 case LTTNG_DOMAIN_UST:
1236 {
1237 struct ltt_ust_session *usess = session->ust_session;
1238 unsigned int chan_count;
1239
1240 assert(usess);
1241
1242 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1243 if (chan_count == 0) {
1244 struct lttng_channel *attr;
1245 /* Create default channel */
1246 attr = channel_new_default_attr(domain, usess->buffer_type);
1247 if (attr == NULL) {
1248 ret = LTTNG_ERR_FATAL;
1249 goto error;
1250 }
1251
1252 ret = channel_ust_create(usess, attr, usess->buffer_type);
1253 if (ret != LTTNG_OK) {
1254 free(attr);
1255 goto error;
1256 }
1257 free(attr);
1258 chan_ust_created = 1;
1259 }
1260
1261 ret = context_ust_add(usess, domain, ctx, channel_name);
1262 if (ret != LTTNG_OK) {
1263 goto error;
1264 }
1265 break;
1266 }
1267 #if 0
1268 case LTTNG_DOMAIN_UST_EXEC_NAME:
1269 case LTTNG_DOMAIN_UST_PID:
1270 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1271 #endif
1272 default:
1273 ret = LTTNG_ERR_UND;
1274 goto error;
1275 }
1276
1277 return LTTNG_OK;
1278
1279 error:
1280 if (chan_kern_created) {
1281 struct ltt_kernel_channel *kchan =
1282 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1283 session->kernel_session);
1284 /* Created previously, this should NOT fail. */
1285 assert(kchan);
1286 kernel_destroy_channel(kchan);
1287 }
1288
1289 if (chan_ust_created) {
1290 struct ltt_ust_channel *uchan =
1291 trace_ust_find_channel_by_name(
1292 session->ust_session->domain_global.channels,
1293 DEFAULT_CHANNEL_NAME);
1294 /* Created previously, this should NOT fail. */
1295 assert(uchan);
1296 /* Remove from the channel list of the session. */
1297 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1298 uchan);
1299 trace_ust_destroy_channel(uchan);
1300 }
1301 return ret;
1302 }
1303
1304 /*
1305 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1306 * We own filter, exclusion, and filter_expression.
1307 */
1308 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1309 char *channel_name, struct lttng_event *event,
1310 char *filter_expression,
1311 struct lttng_filter_bytecode *filter,
1312 struct lttng_event_exclusion *exclusion,
1313 int wpipe)
1314 {
1315 int ret, channel_created = 0;
1316 struct lttng_channel *attr;
1317
1318 assert(session);
1319 assert(event);
1320 assert(channel_name);
1321
1322 rcu_read_lock();
1323
1324 switch (domain->type) {
1325 case LTTNG_DOMAIN_KERNEL:
1326 {
1327 struct ltt_kernel_channel *kchan;
1328
1329 /*
1330 * If a non-default channel has been created in the
1331 * session, explicitely require that -c chan_name needs
1332 * to be provided.
1333 */
1334 if (session->kernel_session->has_non_default_channel
1335 && channel_name[0] == '\0') {
1336 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1337 goto error;
1338 }
1339
1340 kchan = trace_kernel_get_channel_by_name(channel_name,
1341 session->kernel_session);
1342 if (kchan == NULL) {
1343 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1344 LTTNG_BUFFER_GLOBAL);
1345 if (attr == NULL) {
1346 ret = LTTNG_ERR_FATAL;
1347 goto error;
1348 }
1349 strncpy(attr->name, channel_name, sizeof(attr->name));
1350
1351 ret = cmd_enable_channel(session, domain, attr, wpipe);
1352 if (ret != LTTNG_OK) {
1353 free(attr);
1354 goto error;
1355 }
1356 free(attr);
1357
1358 channel_created = 1;
1359 }
1360
1361 /* Get the newly created kernel channel pointer */
1362 kchan = trace_kernel_get_channel_by_name(channel_name,
1363 session->kernel_session);
1364 if (kchan == NULL) {
1365 /* This sould not happen... */
1366 ret = LTTNG_ERR_FATAL;
1367 goto error;
1368 }
1369
1370 ret = event_kernel_enable_tracepoint(kchan, event);
1371 if (ret != LTTNG_OK) {
1372 if (channel_created) {
1373 /* Let's not leak a useless channel. */
1374 kernel_destroy_channel(kchan);
1375 }
1376 goto error;
1377 }
1378
1379 kernel_wait_quiescent(kernel_tracer_fd);
1380 break;
1381 }
1382 case LTTNG_DOMAIN_UST:
1383 {
1384 struct ltt_ust_channel *uchan;
1385 struct ltt_ust_session *usess = session->ust_session;
1386
1387 assert(usess);
1388
1389 /*
1390 * If a non-default channel has been created in the
1391 * session, explicitely require that -c chan_name needs
1392 * to be provided.
1393 */
1394 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1395 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1396 goto error;
1397 }
1398
1399 /* Get channel from global UST domain */
1400 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1401 channel_name);
1402 if (uchan == NULL) {
1403 /* Create default channel */
1404 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1405 usess->buffer_type);
1406 if (attr == NULL) {
1407 ret = LTTNG_ERR_FATAL;
1408 goto error;
1409 }
1410 strncpy(attr->name, channel_name, sizeof(attr->name));
1411
1412 ret = cmd_enable_channel(session, domain, attr, wpipe);
1413 if (ret != LTTNG_OK) {
1414 free(attr);
1415 goto error;
1416 }
1417 free(attr);
1418
1419 /* Get the newly created channel reference back */
1420 uchan = trace_ust_find_channel_by_name(
1421 usess->domain_global.channels, channel_name);
1422 assert(uchan);
1423 }
1424
1425 /* At this point, the session and channel exist on the tracer */
1426 ret = event_ust_enable_tracepoint(usess, uchan, event,
1427 filter_expression, filter, exclusion);
1428 /* We have passed ownership */
1429 filter_expression = NULL;
1430 filter = NULL;
1431 exclusion = NULL;
1432 if (ret != LTTNG_OK) {
1433 goto error;
1434 }
1435 break;
1436 }
1437 case LTTNG_DOMAIN_JUL:
1438 {
1439 struct lttng_event uevent;
1440 struct lttng_domain tmp_dom;
1441 struct ltt_ust_session *usess = session->ust_session;
1442
1443 assert(usess);
1444
1445 /* Create the default JUL tracepoint. */
1446 memset(&uevent, 0, sizeof(uevent));
1447 uevent.type = LTTNG_EVENT_TRACEPOINT;
1448 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1449 if (is_root) {
1450 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1451 sizeof(uevent.name));
1452 } else {
1453 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1454 sizeof(uevent.name));
1455 }
1456 uevent.name[sizeof(uevent.name) - 1] = '\0';
1457
1458 /*
1459 * The domain type is changed because we are about to enable the
1460 * default channel and event for the JUL domain that are hardcoded.
1461 * This happens in the UST domain.
1462 */
1463 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1464 tmp_dom.type = LTTNG_DOMAIN_UST;
1465
1466 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1467 &uevent, filter_expression, filter, NULL, wpipe);
1468 /* We have passed ownership */
1469 filter_expression = NULL;
1470 filter = NULL;
1471 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1472 goto error;
1473 }
1474
1475 /* The wild card * means that everything should be enabled. */
1476 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1477 ret = event_jul_enable_all(usess, event, filter);
1478 } else {
1479 ret = event_jul_enable(usess, event, filter);
1480 }
1481 if (ret != LTTNG_OK) {
1482 goto error;
1483 }
1484
1485 break;
1486 }
1487 #if 0
1488 case LTTNG_DOMAIN_UST_EXEC_NAME:
1489 case LTTNG_DOMAIN_UST_PID:
1490 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1491 #endif
1492 default:
1493 ret = LTTNG_ERR_UND;
1494 goto error;
1495 }
1496
1497 ret = LTTNG_OK;
1498
1499 error:
1500 free(filter_expression);
1501 free(filter);
1502 free(exclusion);
1503 rcu_read_unlock();
1504 return ret;
1505 }
1506
1507 /*
1508 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1509 */
1510 int cmd_enable_event_all(struct ltt_session *session,
1511 struct lttng_domain *domain, char *channel_name, int event_type,
1512 char *filter_expression,
1513 struct lttng_filter_bytecode *filter, int wpipe)
1514 {
1515 int ret;
1516 struct lttng_channel *attr;
1517
1518 assert(session);
1519 assert(channel_name);
1520
1521 rcu_read_lock();
1522
1523 switch (domain->type) {
1524 case LTTNG_DOMAIN_KERNEL:
1525 {
1526 struct ltt_kernel_channel *kchan;
1527
1528 assert(session->kernel_session);
1529
1530 /*
1531 * If a non-default channel has been created in the
1532 * session, explicitely require that -c chan_name needs
1533 * to be provided.
1534 */
1535 if (session->kernel_session->has_non_default_channel
1536 && channel_name[0] == '\0') {
1537 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1538 goto error;
1539 }
1540
1541 kchan = trace_kernel_get_channel_by_name(channel_name,
1542 session->kernel_session);
1543 if (kchan == NULL) {
1544 /* Create default channel */
1545 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1546 LTTNG_BUFFER_GLOBAL);
1547 if (attr == NULL) {
1548 ret = LTTNG_ERR_FATAL;
1549 goto error;
1550 }
1551 strncpy(attr->name, channel_name, sizeof(attr->name));
1552
1553 ret = cmd_enable_channel(session, domain, attr, wpipe);
1554 if (ret != LTTNG_OK) {
1555 free(attr);
1556 goto error;
1557 }
1558 free(attr);
1559
1560 /* Get the newly created kernel channel pointer */
1561 kchan = trace_kernel_get_channel_by_name(channel_name,
1562 session->kernel_session);
1563 assert(kchan);
1564 }
1565
1566 switch (event_type) {
1567 case LTTNG_EVENT_SYSCALL:
1568 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1569 break;
1570 case LTTNG_EVENT_TRACEPOINT:
1571 /*
1572 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1573 * events already registered to the channel.
1574 */
1575 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1576 break;
1577 case LTTNG_EVENT_ALL:
1578 /* Enable syscalls and tracepoints */
1579 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1580 break;
1581 default:
1582 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1583 goto error;
1584 }
1585
1586 /* Manage return value */
1587 if (ret != LTTNG_OK) {
1588 /*
1589 * On error, cmd_enable_channel call will take care of destroying
1590 * the created channel if it was needed.
1591 */
1592 goto error;
1593 }
1594
1595 kernel_wait_quiescent(kernel_tracer_fd);
1596 break;
1597 }
1598 case LTTNG_DOMAIN_UST:
1599 {
1600 struct ltt_ust_channel *uchan;
1601 struct ltt_ust_session *usess = session->ust_session;
1602
1603 assert(usess);
1604
1605 /*
1606 * If a non-default channel has been created in the
1607 * session, explicitely require that -c chan_name needs
1608 * to be provided.
1609 */
1610 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1611 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1612 goto error;
1613 }
1614
1615 /* Get channel from global UST domain */
1616 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1617 channel_name);
1618 if (uchan == NULL) {
1619 /* Create default channel */
1620 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1621 usess->buffer_type);
1622 if (attr == NULL) {
1623 ret = LTTNG_ERR_FATAL;
1624 goto error;
1625 }
1626 strncpy(attr->name, channel_name, sizeof(attr->name));
1627
1628 ret = cmd_enable_channel(session, domain, attr, wpipe);
1629 if (ret != LTTNG_OK) {
1630 free(attr);
1631 goto error;
1632 }
1633 free(attr);
1634
1635 /* Get the newly created channel reference back */
1636 uchan = trace_ust_find_channel_by_name(
1637 usess->domain_global.channels, channel_name);
1638 assert(uchan);
1639 }
1640
1641 /* At this point, the session and channel exist on the tracer */
1642
1643 switch (event_type) {
1644 case LTTNG_EVENT_ALL:
1645 case LTTNG_EVENT_TRACEPOINT:
1646 ret = event_ust_enable_all_tracepoints(usess, uchan,
1647 filter_expression, filter);
1648 if (ret != LTTNG_OK) {
1649 goto error;
1650 }
1651 break;
1652 default:
1653 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1654 goto error;
1655 }
1656
1657 /* Manage return value */
1658 if (ret != LTTNG_OK) {
1659 goto error;
1660 }
1661
1662 break;
1663 }
1664 case LTTNG_DOMAIN_JUL:
1665 {
1666 struct lttng_event uevent, event;
1667 struct lttng_domain tmp_dom;
1668 struct ltt_ust_session *usess = session->ust_session;
1669
1670 assert(usess);
1671
1672 /* Create the default JUL tracepoint. */
1673 uevent.type = LTTNG_EVENT_TRACEPOINT;
1674 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1675 if (is_root) {
1676 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1677 sizeof(uevent.name));
1678 } else {
1679 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1680 sizeof(uevent.name));
1681 }
1682 uevent.name[sizeof(uevent.name) - 1] = '\0';
1683
1684 /*
1685 * The domain type is changed because we are about to enable the
1686 * default channel and event for the JUL domain that are hardcoded.
1687 * This happens in the UST domain.
1688 */
1689 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1690 tmp_dom.type = LTTNG_DOMAIN_UST;
1691
1692 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1693 &uevent, NULL, NULL, NULL, wpipe);
1694 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1695 goto error;
1696 }
1697
1698 event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1699 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1700 strncpy(event.name, "*", sizeof(event.name));
1701 event.name[sizeof(event.name) - 1] = '\0';
1702
1703 ret = event_jul_enable_all(usess, &event, filter);
1704 if (ret != LTTNG_OK) {
1705 goto error;
1706 }
1707
1708 break;
1709 }
1710 #if 0
1711 case LTTNG_DOMAIN_UST_EXEC_NAME:
1712 case LTTNG_DOMAIN_UST_PID:
1713 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1714 #endif
1715 default:
1716 ret = LTTNG_ERR_UND;
1717 goto error;
1718 }
1719
1720 ret = LTTNG_OK;
1721
1722 error:
1723 rcu_read_unlock();
1724 return ret;
1725 }
1726
1727
1728 /*
1729 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1730 */
1731 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1732 {
1733 int ret;
1734 ssize_t nb_events = 0;
1735
1736 switch (domain) {
1737 case LTTNG_DOMAIN_KERNEL:
1738 nb_events = kernel_list_events(kernel_tracer_fd, events);
1739 if (nb_events < 0) {
1740 ret = LTTNG_ERR_KERN_LIST_FAIL;
1741 goto error;
1742 }
1743 break;
1744 case LTTNG_DOMAIN_UST:
1745 nb_events = ust_app_list_events(events);
1746 if (nb_events < 0) {
1747 ret = LTTNG_ERR_UST_LIST_FAIL;
1748 goto error;
1749 }
1750 break;
1751 case LTTNG_DOMAIN_JUL:
1752 nb_events = jul_list_events(events);
1753 if (nb_events < 0) {
1754 ret = LTTNG_ERR_UST_LIST_FAIL;
1755 goto error;
1756 }
1757 break;
1758 default:
1759 ret = LTTNG_ERR_UND;
1760 goto error;
1761 }
1762
1763 return nb_events;
1764
1765 error:
1766 /* Return negative value to differentiate return code */
1767 return -ret;
1768 }
1769
1770 /*
1771 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1772 */
1773 ssize_t cmd_list_tracepoint_fields(int domain,
1774 struct lttng_event_field **fields)
1775 {
1776 int ret;
1777 ssize_t nb_fields = 0;
1778
1779 switch (domain) {
1780 case LTTNG_DOMAIN_UST:
1781 nb_fields = ust_app_list_event_fields(fields);
1782 if (nb_fields < 0) {
1783 ret = LTTNG_ERR_UST_LIST_FAIL;
1784 goto error;
1785 }
1786 break;
1787 case LTTNG_DOMAIN_KERNEL:
1788 default: /* fall-through */
1789 ret = LTTNG_ERR_UND;
1790 goto error;
1791 }
1792
1793 return nb_fields;
1794
1795 error:
1796 /* Return negative value to differentiate return code */
1797 return -ret;
1798 }
1799
1800 /*
1801 * Command LTTNG_START_TRACE processed by the client thread.
1802 */
1803 int cmd_start_trace(struct ltt_session *session)
1804 {
1805 int ret;
1806 unsigned long nb_chan = 0;
1807 struct ltt_kernel_session *ksession;
1808 struct ltt_ust_session *usess;
1809
1810 assert(session);
1811
1812 /* Ease our life a bit ;) */
1813 ksession = session->kernel_session;
1814 usess = session->ust_session;
1815
1816 /* Is the session already started? */
1817 if (session->active) {
1818 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1819 goto error;
1820 }
1821
1822 /*
1823 * Starting a session without channel is useless since after that it's not
1824 * possible to enable channel thus inform the client.
1825 */
1826 if (usess && usess->domain_global.channels) {
1827 rcu_read_lock();
1828 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1829 rcu_read_unlock();
1830 }
1831 if (ksession) {
1832 nb_chan += ksession->channel_count;
1833 }
1834 if (!nb_chan) {
1835 ret = LTTNG_ERR_NO_CHANNEL;
1836 goto error;
1837 }
1838
1839 /* Kernel tracing */
1840 if (ksession != NULL) {
1841 ret = start_kernel_session(ksession, kernel_tracer_fd);
1842 if (ret != LTTNG_OK) {
1843 goto error;
1844 }
1845 }
1846
1847 /* Flag session that trace should start automatically */
1848 if (usess) {
1849 /*
1850 * Even though the start trace might fail, flag this session active so
1851 * other application coming in are started by default.
1852 */
1853 usess->active = 1;
1854
1855 ret = ust_app_start_trace_all(usess);
1856 if (ret < 0) {
1857 ret = LTTNG_ERR_UST_START_FAIL;
1858 goto error;
1859 }
1860 }
1861
1862 /* Flag this after a successful start. */
1863 session->has_been_started = 1;
1864 session->active = 1;
1865
1866 ret = LTTNG_OK;
1867
1868 error:
1869 return ret;
1870 }
1871
1872 /*
1873 * Command LTTNG_STOP_TRACE processed by the client thread.
1874 */
1875 int cmd_stop_trace(struct ltt_session *session)
1876 {
1877 int ret;
1878 struct ltt_kernel_channel *kchan;
1879 struct ltt_kernel_session *ksession;
1880 struct ltt_ust_session *usess;
1881
1882 assert(session);
1883
1884 /* Short cut */
1885 ksession = session->kernel_session;
1886 usess = session->ust_session;
1887
1888 /* Session is not active. Skip everythong and inform the client. */
1889 if (!session->active) {
1890 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1891 goto error;
1892 }
1893
1894 /* Kernel tracer */
1895 if (ksession && ksession->active) {
1896 DBG("Stop kernel tracing");
1897
1898 /* Flush metadata if exist */
1899 if (ksession->metadata_stream_fd >= 0) {
1900 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1901 if (ret < 0) {
1902 ERR("Kernel metadata flush failed");
1903 }
1904 }
1905
1906 /* Flush all buffers before stopping */
1907 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1908 ret = kernel_flush_buffer(kchan);
1909 if (ret < 0) {
1910 ERR("Kernel flush buffer error");
1911 }
1912 }
1913
1914 ret = kernel_stop_session(ksession);
1915 if (ret < 0) {
1916 ret = LTTNG_ERR_KERN_STOP_FAIL;
1917 goto error;
1918 }
1919
1920 kernel_wait_quiescent(kernel_tracer_fd);
1921
1922 ksession->active = 0;
1923 }
1924
1925 if (usess && usess->active) {
1926 /*
1927 * Even though the stop trace might fail, flag this session inactive so
1928 * other application coming in are not started by default.
1929 */
1930 usess->active = 0;
1931
1932 ret = ust_app_stop_trace_all(usess);
1933 if (ret < 0) {
1934 ret = LTTNG_ERR_UST_STOP_FAIL;
1935 goto error;
1936 }
1937 }
1938
1939 /* Flag inactive after a successful stop. */
1940 session->active = 0;
1941 ret = LTTNG_OK;
1942
1943 error:
1944 return ret;
1945 }
1946
1947 /*
1948 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1949 */
1950 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1951 size_t nb_uri, struct lttng_uri *uris)
1952 {
1953 int ret, i;
1954 struct ltt_kernel_session *ksess = session->kernel_session;
1955 struct ltt_ust_session *usess = session->ust_session;
1956 struct consumer_output *consumer = NULL;
1957
1958 assert(session);
1959 assert(uris);
1960 assert(nb_uri > 0);
1961
1962 /* Can't set consumer URI if the session is active. */
1963 if (session->active) {
1964 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1965 goto error;
1966 }
1967
1968 /*
1969 * This case switch makes sure the domain session has a temporary consumer
1970 * so the URL can be set.
1971 */
1972 switch (domain) {
1973 case 0:
1974 /* Code flow error. A session MUST always have a consumer object */
1975 assert(session->consumer);
1976 /*
1977 * The URL will be added to the tracing session consumer instead of a
1978 * specific domain consumer.
1979 */
1980 consumer = session->consumer;
1981 break;
1982 case LTTNG_DOMAIN_KERNEL:
1983 /* Code flow error if we don't have a kernel session here. */
1984 assert(ksess);
1985 assert(ksess->consumer);
1986 consumer = ksess->consumer;
1987 break;
1988 case LTTNG_DOMAIN_UST:
1989 /* Code flow error if we don't have a kernel session here. */
1990 assert(usess);
1991 assert(usess->consumer);
1992 consumer = usess->consumer;
1993 break;
1994 }
1995
1996 for (i = 0; i < nb_uri; i++) {
1997 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1998 if (ret != LTTNG_OK) {
1999 goto error;
2000 }
2001 }
2002
2003 /*
2004 * Make sure to set the session in output mode after we set URI since a
2005 * session can be created without URL (thus flagged in no output mode).
2006 */
2007 session->output_traces = 1;
2008 if (ksess) {
2009 ksess->output_traces = 1;
2010 } else if (usess) {
2011 usess->output_traces = 1;
2012 }
2013
2014 /* All good! */
2015 ret = LTTNG_OK;
2016
2017 error:
2018 return ret;
2019 }
2020
2021 /*
2022 * Command LTTNG_CREATE_SESSION processed by the client thread.
2023 */
2024 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2025 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2026 {
2027 int ret;
2028 struct ltt_session *session;
2029
2030 assert(name);
2031 assert(creds);
2032
2033 /*
2034 * Verify if the session already exist
2035 *
2036 * XXX: There is no need for the session lock list here since the caller
2037 * (process_client_msg) is holding it. We might want to change that so a
2038 * single command does not lock the entire session list.
2039 */
2040 session = session_find_by_name(name);
2041 if (session != NULL) {
2042 ret = LTTNG_ERR_EXIST_SESS;
2043 goto find_error;
2044 }
2045
2046 /* Create tracing session in the registry */
2047 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2048 LTTNG_SOCK_GET_GID_CRED(creds));
2049 if (ret != LTTNG_OK) {
2050 goto session_error;
2051 }
2052
2053 /*
2054 * Get the newly created session pointer back
2055 *
2056 * XXX: There is no need for the session lock list here since the caller
2057 * (process_client_msg) is holding it. We might want to change that so a
2058 * single command does not lock the entire session list.
2059 */
2060 session = session_find_by_name(name);
2061 assert(session);
2062
2063 session->live_timer = live_timer;
2064 /* Create default consumer output for the session not yet created. */
2065 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2066 if (session->consumer == NULL) {
2067 ret = LTTNG_ERR_FATAL;
2068 goto consumer_error;
2069 }
2070
2071 if (uris) {
2072 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2073 if (ret != LTTNG_OK) {
2074 goto consumer_error;
2075 }
2076 session->output_traces = 1;
2077 } else {
2078 session->output_traces = 0;
2079 DBG2("Session %s created with no output", session->name);
2080 }
2081
2082 session->consumer->enabled = 1;
2083
2084 return LTTNG_OK;
2085
2086 consumer_error:
2087 session_destroy(session);
2088 session_error:
2089 find_error:
2090 return ret;
2091 }
2092
2093 /*
2094 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2095 */
2096 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2097 size_t nb_uri, lttng_sock_cred *creds)
2098 {
2099 int ret;
2100 struct ltt_session *session;
2101 struct snapshot_output *new_output = NULL;
2102
2103 assert(name);
2104 assert(creds);
2105
2106 /*
2107 * Create session in no output mode with URIs set to NULL. The uris we've
2108 * received are for a default snapshot output if one.
2109 */
2110 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2111 if (ret != LTTNG_OK) {
2112 goto error;
2113 }
2114
2115 /* Get the newly created session pointer back. This should NEVER fail. */
2116 session = session_find_by_name(name);
2117 assert(session);
2118
2119 /* Flag session for snapshot mode. */
2120 session->snapshot_mode = 1;
2121
2122 /* Skip snapshot output creation if no URI is given. */
2123 if (nb_uri == 0) {
2124 goto end;
2125 }
2126
2127 new_output = snapshot_output_alloc();
2128 if (!new_output) {
2129 ret = LTTNG_ERR_NOMEM;
2130 goto error_snapshot_alloc;
2131 }
2132
2133 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2134 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2135 if (ret < 0) {
2136 if (ret == -ENOMEM) {
2137 ret = LTTNG_ERR_NOMEM;
2138 } else {
2139 ret = LTTNG_ERR_INVALID;
2140 }
2141 goto error_snapshot;
2142 }
2143
2144 rcu_read_lock();
2145 snapshot_add_output(&session->snapshot, new_output);
2146 rcu_read_unlock();
2147
2148 end:
2149 return LTTNG_OK;
2150
2151 error_snapshot:
2152 snapshot_output_destroy(new_output);
2153 error_snapshot_alloc:
2154 session_destroy(session);
2155 error:
2156 return ret;
2157 }
2158
2159 /*
2160 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2161 */
2162 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2163 {
2164 int ret;
2165 struct ltt_ust_session *usess;
2166 struct ltt_kernel_session *ksess;
2167
2168 /* Safety net */
2169 assert(session);
2170
2171 usess = session->ust_session;
2172 ksess = session->kernel_session;
2173
2174 /* Clean kernel session teardown */
2175 kernel_destroy_session(ksess);
2176
2177 /* UST session teardown */
2178 if (usess) {
2179 /* Close any relayd session */
2180 consumer_output_send_destroy_relayd(usess->consumer);
2181
2182 /* Destroy every UST application related to this session. */
2183 ret = ust_app_destroy_trace_all(usess);
2184 if (ret) {
2185 ERR("Error in ust_app_destroy_trace_all");
2186 }
2187
2188 /* Clean up the rest. */
2189 trace_ust_destroy_session(usess);
2190 }
2191
2192 /*
2193 * Must notify the kernel thread here to update it's poll set in order to
2194 * remove the channel(s)' fd just destroyed.
2195 */
2196 ret = notify_thread_pipe(wpipe);
2197 if (ret < 0) {
2198 PERROR("write kernel poll pipe");
2199 }
2200
2201 ret = session_destroy(session);
2202
2203 return ret;
2204 }
2205
2206 /*
2207 * Command LTTNG_CALIBRATE processed by the client thread.
2208 */
2209 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2210 {
2211 int ret;
2212
2213 switch (domain) {
2214 case LTTNG_DOMAIN_KERNEL:
2215 {
2216 struct lttng_kernel_calibrate kcalibrate;
2217
2218 switch (calibrate->type) {
2219 case LTTNG_CALIBRATE_FUNCTION:
2220 default:
2221 /* Default and only possible calibrate option. */
2222 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2223 break;
2224 }
2225
2226 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2227 if (ret < 0) {
2228 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2229 goto error;
2230 }
2231 break;
2232 }
2233 case LTTNG_DOMAIN_UST:
2234 {
2235 struct lttng_ust_calibrate ucalibrate;
2236
2237 switch (calibrate->type) {
2238 case LTTNG_CALIBRATE_FUNCTION:
2239 default:
2240 /* Default and only possible calibrate option. */
2241 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2242 break;
2243 }
2244
2245 ret = ust_app_calibrate_glb(&ucalibrate);
2246 if (ret < 0) {
2247 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2248 goto error;
2249 }
2250 break;
2251 }
2252 default:
2253 ret = LTTNG_ERR_UND;
2254 goto error;
2255 }
2256
2257 ret = LTTNG_OK;
2258
2259 error:
2260 return ret;
2261 }
2262
2263 /*
2264 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2265 */
2266 int cmd_register_consumer(struct ltt_session *session, int domain,
2267 const char *sock_path, struct consumer_data *cdata)
2268 {
2269 int ret, sock;
2270 struct consumer_socket *socket = NULL;
2271
2272 assert(session);
2273 assert(cdata);
2274 assert(sock_path);
2275
2276 switch (domain) {
2277 case LTTNG_DOMAIN_KERNEL:
2278 {
2279 struct ltt_kernel_session *ksess = session->kernel_session;
2280
2281 assert(ksess);
2282
2283 /* Can't register a consumer if there is already one */
2284 if (ksess->consumer_fds_sent != 0) {
2285 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2286 goto error;
2287 }
2288
2289 sock = lttcomm_connect_unix_sock(sock_path);
2290 if (sock < 0) {
2291 ret = LTTNG_ERR_CONNECT_FAIL;
2292 goto error;
2293 }
2294 cdata->cmd_sock = sock;
2295
2296 socket = consumer_allocate_socket(&cdata->cmd_sock);
2297 if (socket == NULL) {
2298 ret = close(sock);
2299 if (ret < 0) {
2300 PERROR("close register consumer");
2301 }
2302 cdata->cmd_sock = -1;
2303 ret = LTTNG_ERR_FATAL;
2304 goto error;
2305 }
2306
2307 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2308 if (socket->lock == NULL) {
2309 PERROR("zmalloc pthread mutex");
2310 ret = LTTNG_ERR_FATAL;
2311 goto error;
2312 }
2313 pthread_mutex_init(socket->lock, NULL);
2314 socket->registered = 1;
2315
2316 rcu_read_lock();
2317 consumer_add_socket(socket, ksess->consumer);
2318 rcu_read_unlock();
2319
2320 pthread_mutex_lock(&cdata->pid_mutex);
2321 cdata->pid = -1;
2322 pthread_mutex_unlock(&cdata->pid_mutex);
2323
2324 break;
2325 }
2326 default:
2327 /* TODO: Userspace tracing */
2328 ret = LTTNG_ERR_UND;
2329 goto error;
2330 }
2331
2332 return LTTNG_OK;
2333
2334 error:
2335 if (socket) {
2336 consumer_destroy_socket(socket);
2337 }
2338 return ret;
2339 }
2340
2341 /*
2342 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2343 */
2344 ssize_t cmd_list_domains(struct ltt_session *session,
2345 struct lttng_domain **domains)
2346 {
2347 int ret, index = 0;
2348 ssize_t nb_dom = 0;
2349
2350 if (session->kernel_session != NULL) {
2351 DBG3("Listing domains found kernel domain");
2352 nb_dom++;
2353 }
2354
2355 if (session->ust_session != NULL) {
2356 DBG3("Listing domains found UST global domain");
2357 nb_dom++;
2358
2359 if (session->ust_session->domain_jul.being_used) {
2360 nb_dom++;
2361 }
2362 }
2363
2364 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2365 if (*domains == NULL) {
2366 ret = LTTNG_ERR_FATAL;
2367 goto error;
2368 }
2369
2370 if (session->kernel_session != NULL) {
2371 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2372 index++;
2373 }
2374
2375 if (session->ust_session != NULL) {
2376 (*domains)[index].type = LTTNG_DOMAIN_UST;
2377 (*domains)[index].buf_type = session->ust_session->buffer_type;
2378 index++;
2379
2380 if (session->ust_session->domain_jul.being_used) {
2381 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2382 (*domains)[index].buf_type = session->ust_session->buffer_type;
2383 index++;
2384 }
2385 }
2386
2387 return nb_dom;
2388
2389 error:
2390 /* Return negative value to differentiate return code */
2391 return -ret;
2392 }
2393
2394
2395 /*
2396 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2397 */
2398 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2399 struct lttng_channel **channels)
2400 {
2401 int ret;
2402 ssize_t nb_chan = 0;
2403
2404 switch (domain) {
2405 case LTTNG_DOMAIN_KERNEL:
2406 if (session->kernel_session != NULL) {
2407 nb_chan = session->kernel_session->channel_count;
2408 }
2409 DBG3("Number of kernel channels %zd", nb_chan);
2410 if (nb_chan <= 0) {
2411 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2412 }
2413 break;
2414 case LTTNG_DOMAIN_UST:
2415 if (session->ust_session != NULL) {
2416 nb_chan = lttng_ht_get_count(
2417 session->ust_session->domain_global.channels);
2418 }
2419 DBG3("Number of UST global channels %zd", nb_chan);
2420 if (nb_chan < 0) {
2421 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2422 goto error;
2423 }
2424 break;
2425 default:
2426 ret = LTTNG_ERR_UND;
2427 goto error;
2428 }
2429
2430 if (nb_chan > 0) {
2431 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2432 if (*channels == NULL) {
2433 ret = LTTNG_ERR_FATAL;
2434 goto error;
2435 }
2436
2437 list_lttng_channels(domain, session, *channels);
2438 }
2439
2440 return nb_chan;
2441
2442 error:
2443 /* Return negative value to differentiate return code */
2444 return -ret;
2445 }
2446
2447 /*
2448 * Command LTTNG_LIST_EVENTS processed by the client thread.
2449 */
2450 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2451 char *channel_name, struct lttng_event **events)
2452 {
2453 int ret = 0;
2454 ssize_t nb_event = 0;
2455
2456 switch (domain) {
2457 case LTTNG_DOMAIN_KERNEL:
2458 if (session->kernel_session != NULL) {
2459 nb_event = list_lttng_kernel_events(channel_name,
2460 session->kernel_session, events);
2461 }
2462 break;
2463 case LTTNG_DOMAIN_UST:
2464 {
2465 if (session->ust_session != NULL) {
2466 nb_event = list_lttng_ust_global_events(channel_name,
2467 &session->ust_session->domain_global, events);
2468 }
2469 break;
2470 }
2471 case LTTNG_DOMAIN_JUL:
2472 if (session->ust_session) {
2473 nb_event = list_lttng_jul_events(
2474 &session->ust_session->domain_jul, events);
2475 }
2476 break;
2477 default:
2478 ret = LTTNG_ERR_UND;
2479 goto error;
2480 }
2481
2482 return nb_event;
2483
2484 error:
2485 /* Return negative value to differentiate return code */
2486 return -ret;
2487 }
2488
2489 /*
2490 * Using the session list, filled a lttng_session array to send back to the
2491 * client for session listing.
2492 *
2493 * The session list lock MUST be acquired before calling this function. Use
2494 * session_lock_list() and session_unlock_list().
2495 */
2496 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2497 gid_t gid)
2498 {
2499 int ret;
2500 unsigned int i = 0;
2501 struct ltt_session *session;
2502 struct ltt_session_list *list = session_get_list();
2503
2504 DBG("Getting all available session for UID %d GID %d",
2505 uid, gid);
2506 /*
2507 * Iterate over session list and append data after the control struct in
2508 * the buffer.
2509 */
2510 cds_list_for_each_entry(session, &list->head, list) {
2511 /*
2512 * Only list the sessions the user can control.
2513 */
2514 if (!session_access_ok(session, uid, gid)) {
2515 continue;
2516 }
2517
2518 struct ltt_kernel_session *ksess = session->kernel_session;
2519 struct ltt_ust_session *usess = session->ust_session;
2520
2521 if (session->consumer->type == CONSUMER_DST_NET ||
2522 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2523 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2524 ret = build_network_session_path(sessions[i].path,
2525 sizeof(sessions[i].path), session);
2526 } else {
2527 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2528 session->consumer->dst.trace_path);
2529 }
2530 if (ret < 0) {
2531 PERROR("snprintf session path");
2532 continue;
2533 }
2534
2535 strncpy(sessions[i].name, session->name, NAME_MAX);
2536 sessions[i].name[NAME_MAX - 1] = '\0';
2537 sessions[i].enabled = session->active;
2538 sessions[i].snapshot_mode = session->snapshot_mode;
2539 sessions[i].live_timer_interval = session->live_timer;
2540 i++;
2541 }
2542 }
2543
2544 /*
2545 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2546 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2547 */
2548 int cmd_data_pending(struct ltt_session *session)
2549 {
2550 int ret;
2551 struct ltt_kernel_session *ksess = session->kernel_session;
2552 struct ltt_ust_session *usess = session->ust_session;
2553
2554 assert(session);
2555
2556 /* Session MUST be stopped to ask for data availability. */
2557 if (session->active) {
2558 ret = LTTNG_ERR_SESSION_STARTED;
2559 goto error;
2560 } else {
2561 /*
2562 * If stopped, just make sure we've started before else the above call
2563 * will always send that there is data pending.
2564 *
2565 * The consumer assumes that when the data pending command is received,
2566 * the trace has been started before or else no output data is written
2567 * by the streams which is a condition for data pending. So, this is
2568 * *VERY* important that we don't ask the consumer before a start
2569 * trace.
2570 */
2571 if (!session->has_been_started) {
2572 ret = 0;
2573 goto error;
2574 }
2575 }
2576
2577 if (ksess && ksess->consumer) {
2578 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2579 if (ret == 1) {
2580 /* Data is still being extracted for the kernel. */
2581 goto error;
2582 }
2583 }
2584
2585 if (usess && usess->consumer) {
2586 ret = consumer_is_data_pending(usess->id, usess->consumer);
2587 if (ret == 1) {
2588 /* Data is still being extracted for the kernel. */
2589 goto error;
2590 }
2591 }
2592
2593 /* Data is ready to be read by a viewer */
2594 ret = 0;
2595
2596 error:
2597 return ret;
2598 }
2599
2600 /*
2601 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2602 *
2603 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2604 */
2605 int cmd_snapshot_add_output(struct ltt_session *session,
2606 struct lttng_snapshot_output *output, uint32_t *id)
2607 {
2608 int ret;
2609 struct snapshot_output *new_output;
2610
2611 assert(session);
2612 assert(output);
2613
2614 DBG("Cmd snapshot add output for session %s", session->name);
2615
2616 /*
2617 * Permission denied to create an output if the session is not
2618 * set in no output mode.
2619 */
2620 if (session->output_traces) {
2621 ret = LTTNG_ERR_EPERM;
2622 goto error;
2623 }
2624
2625 /* Only one output is allowed until we have the "tee" feature. */
2626 if (session->snapshot.nb_output == 1) {
2627 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2628 goto error;
2629 }
2630
2631 new_output = snapshot_output_alloc();
2632 if (!new_output) {
2633 ret = LTTNG_ERR_NOMEM;
2634 goto error;
2635 }
2636
2637 ret = snapshot_output_init(output->max_size, output->name,
2638 output->ctrl_url, output->data_url, session->consumer, new_output,
2639 &session->snapshot);
2640 if (ret < 0) {
2641 if (ret == -ENOMEM) {
2642 ret = LTTNG_ERR_NOMEM;
2643 } else {
2644 ret = LTTNG_ERR_INVALID;
2645 }
2646 goto free_error;
2647 }
2648
2649 rcu_read_lock();
2650 snapshot_add_output(&session->snapshot, new_output);
2651 if (id) {
2652 *id = new_output->id;
2653 }
2654 rcu_read_unlock();
2655
2656 return LTTNG_OK;
2657
2658 free_error:
2659 snapshot_output_destroy(new_output);
2660 error:
2661 return ret;
2662 }
2663
2664 /*
2665 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2666 *
2667 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2668 */
2669 int cmd_snapshot_del_output(struct ltt_session *session,
2670 struct lttng_snapshot_output *output)
2671 {
2672 int ret;
2673 struct snapshot_output *sout = NULL;
2674
2675 assert(session);
2676 assert(output);
2677
2678 rcu_read_lock();
2679
2680 /*
2681 * Permission denied to create an output if the session is not
2682 * set in no output mode.
2683 */
2684 if (session->output_traces) {
2685 ret = LTTNG_ERR_EPERM;
2686 goto error;
2687 }
2688
2689 if (output->id) {
2690 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2691 session->name);
2692 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2693 } else if (*output->name != '\0') {
2694 DBG("Cmd snapshot del output name %s for session %s", output->name,
2695 session->name);
2696 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2697 }
2698 if (!sout) {
2699 ret = LTTNG_ERR_INVALID;
2700 goto error;
2701 }
2702
2703 snapshot_delete_output(&session->snapshot, sout);
2704 snapshot_output_destroy(sout);
2705 ret = LTTNG_OK;
2706
2707 error:
2708 rcu_read_unlock();
2709 return ret;
2710 }
2711
2712 /*
2713 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2714 *
2715 * If no output is available, outputs is untouched and 0 is returned.
2716 *
2717 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2718 */
2719 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2720 struct lttng_snapshot_output **outputs)
2721 {
2722 int ret, idx = 0;
2723 struct lttng_snapshot_output *list = NULL;
2724 struct lttng_ht_iter iter;
2725 struct snapshot_output *output;
2726
2727 assert(session);
2728 assert(outputs);
2729
2730 DBG("Cmd snapshot list outputs for session %s", session->name);
2731
2732 /*
2733 * Permission denied to create an output if the session is not
2734 * set in no output mode.
2735 */
2736 if (session->output_traces) {
2737 ret = -LTTNG_ERR_EPERM;
2738 goto error;
2739 }
2740
2741 if (session->snapshot.nb_output == 0) {
2742 ret = 0;
2743 goto error;
2744 }
2745
2746 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2747 if (!list) {
2748 ret = -LTTNG_ERR_NOMEM;
2749 goto error;
2750 }
2751
2752 /* Copy list from session to the new list object. */
2753 rcu_read_lock();
2754 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2755 output, node.node) {
2756 assert(output->consumer);
2757 list[idx].id = output->id;
2758 list[idx].max_size = output->max_size;
2759 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2760 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2761 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2762 sizeof(list[idx].ctrl_url));
2763 } else {
2764 /* Control URI. */
2765 ret = uri_to_str_url(&output->consumer->dst.net.control,
2766 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2767 if (ret < 0) {
2768 ret = -LTTNG_ERR_NOMEM;
2769 goto error;
2770 }
2771
2772 /* Data URI. */
2773 ret = uri_to_str_url(&output->consumer->dst.net.data,
2774 list[idx].data_url, sizeof(list[idx].data_url));
2775 if (ret < 0) {
2776 ret = -LTTNG_ERR_NOMEM;
2777 goto error;
2778 }
2779 }
2780 idx++;
2781 }
2782
2783 *outputs = list;
2784 list = NULL;
2785 ret = session->snapshot.nb_output;
2786 error:
2787 free(list);
2788 rcu_read_unlock();
2789 return ret;
2790 }
2791
2792 /*
2793 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2794 * snapshot output is *not* set with a remote destination.
2795 *
2796 * Return 0 on success or a LTTNG_ERR code.
2797 */
2798 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2799 struct snapshot_output *snap_output, struct ltt_session *session)
2800 {
2801 int ret = LTTNG_OK;
2802 struct lttng_ht_iter iter;
2803 struct consumer_socket *socket;
2804
2805 assert(consumer);
2806 assert(snap_output);
2807 assert(session);
2808
2809 DBG2("Set relayd object from snapshot output");
2810
2811 /* Ignore if snapshot consumer output is not network. */
2812 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2813 goto error;
2814 }
2815
2816 /*
2817 * For each consumer socket, create and send the relayd object of the
2818 * snapshot output.
2819 */
2820 rcu_read_lock();
2821 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2822 socket, node.node) {
2823 ret = send_consumer_relayd_sockets(0, session->id,
2824 snap_output->consumer, socket,
2825 session->name, session->hostname,
2826 session->live_timer);
2827 if (ret != LTTNG_OK) {
2828 rcu_read_unlock();
2829 goto error;
2830 }
2831 }
2832 rcu_read_unlock();
2833
2834 error:
2835 return ret;
2836 }
2837
2838 /*
2839 * Record a kernel snapshot.
2840 *
2841 * Return LTTNG_OK on success or a LTTNG_ERR code.
2842 */
2843 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2844 struct snapshot_output *output, struct ltt_session *session,
2845 int wait, uint64_t max_stream_size)
2846 {
2847 int ret;
2848
2849 assert(ksess);
2850 assert(output);
2851 assert(session);
2852
2853 /* Get the datetime for the snapshot output directory. */
2854 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2855 sizeof(output->datetime));
2856 if (!ret) {
2857 ret = LTTNG_ERR_INVALID;
2858 goto error;
2859 }
2860
2861 /*
2862 * Copy kernel session sockets so we can communicate with the right
2863 * consumer for the snapshot record command.
2864 */
2865 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2866 if (ret < 0) {
2867 ret = LTTNG_ERR_NOMEM;
2868 goto error;
2869 }
2870
2871 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2872 if (ret != LTTNG_OK) {
2873 goto error_snapshot;
2874 }
2875
2876 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2877 if (ret != LTTNG_OK) {
2878 goto error_snapshot;
2879 }
2880
2881 ret = LTTNG_OK;
2882
2883 error_snapshot:
2884 /* Clean up copied sockets so this output can use some other later on. */
2885 consumer_destroy_output_sockets(output->consumer);
2886 error:
2887 return ret;
2888 }
2889
2890 /*
2891 * Record a UST snapshot.
2892 *
2893 * Return 0 on success or a LTTNG_ERR error code.
2894 */
2895 static int record_ust_snapshot(struct ltt_ust_session *usess,
2896 struct snapshot_output *output, struct ltt_session *session,
2897 int wait, uint64_t max_stream_size)
2898 {
2899 int ret;
2900
2901 assert(usess);
2902 assert(output);
2903 assert(session);
2904
2905 /* Get the datetime for the snapshot output directory. */
2906 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2907 sizeof(output->datetime));
2908 if (!ret) {
2909 ret = LTTNG_ERR_INVALID;
2910 goto error;
2911 }
2912
2913 /*
2914 * Copy UST session sockets so we can communicate with the right
2915 * consumer for the snapshot record command.
2916 */
2917 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2918 if (ret < 0) {
2919 ret = LTTNG_ERR_NOMEM;
2920 goto error;
2921 }
2922
2923 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2924 if (ret != LTTNG_OK) {
2925 goto error_snapshot;
2926 }
2927
2928 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
2929 if (ret < 0) {
2930 switch (-ret) {
2931 case EINVAL:
2932 ret = LTTNG_ERR_INVALID;
2933 break;
2934 case ENODATA:
2935 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2936 break;
2937 default:
2938 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2939 break;
2940 }
2941 goto error_snapshot;
2942 }
2943
2944 ret = LTTNG_OK;
2945
2946 error_snapshot:
2947 /* Clean up copied sockets so this output can use some other later on. */
2948 consumer_destroy_output_sockets(output->consumer);
2949 error:
2950 return ret;
2951 }
2952
2953 /*
2954 * Return the biggest subbuffer size of all channels in the given session.
2955 */
2956 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
2957 {
2958 uint64_t max_size = 0;
2959
2960 assert(session);
2961
2962 if (session->kernel_session) {
2963 struct ltt_kernel_channel *chan;
2964 struct ltt_kernel_session *ksess = session->kernel_session;
2965
2966 /*
2967 * For each channel, add to the max size the size of each subbuffer
2968 * multiplied by their sized.
2969 */
2970 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
2971 if (chan->channel->attr.subbuf_size > max_size) {
2972 max_size = chan->channel->attr.subbuf_size;
2973 }
2974 }
2975 }
2976
2977 if (session->ust_session) {
2978 struct lttng_ht_iter iter;
2979 struct ltt_ust_channel *uchan;
2980 struct ltt_ust_session *usess = session->ust_session;
2981
2982 rcu_read_lock();
2983 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
2984 uchan, node.node) {
2985 if (uchan->attr.subbuf_size > max_size) {
2986 max_size = uchan->attr.subbuf_size;
2987 }
2988 }
2989 rcu_read_unlock();
2990 }
2991
2992 return max_size;
2993 }
2994
2995 /*
2996 * Returns the total number of streams for a session or a negative value
2997 * on error.
2998 */
2999 static unsigned int get_session_nb_streams(struct ltt_session *session)
3000 {
3001 unsigned int total_streams = 0;
3002
3003 if (session->kernel_session) {
3004 struct ltt_kernel_session *ksess = session->kernel_session;
3005
3006 total_streams += ksess->stream_count_global;
3007 }
3008
3009 if (session->ust_session) {
3010 struct ltt_ust_session *usess = session->ust_session;
3011
3012 total_streams += ust_app_get_nb_stream(usess);
3013 }
3014
3015 return total_streams;
3016 }
3017
3018 /*
3019 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3020 *
3021 * The wait parameter is ignored so this call always wait for the snapshot to
3022 * complete before returning.
3023 *
3024 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3025 */
3026 int cmd_snapshot_record(struct ltt_session *session,
3027 struct lttng_snapshot_output *output, int wait)
3028 {
3029 int ret = LTTNG_OK;
3030 unsigned int use_tmp_output = 0;
3031 struct snapshot_output tmp_output;
3032 unsigned int nb_streams, snapshot_success = 0;
3033 uint64_t session_max_size = 0, max_stream_size = 0;
3034
3035 assert(session);
3036
3037 DBG("Cmd snapshot record for session %s", session->name);
3038
3039 /*
3040 * Permission denied to create an output if the session is not
3041 * set in no output mode.
3042 */
3043 if (session->output_traces) {
3044 ret = LTTNG_ERR_EPERM;
3045 goto error;
3046 }
3047
3048 /* The session needs to be started at least once. */
3049 if (!session->has_been_started) {
3050 ret = LTTNG_ERR_START_SESSION_ONCE;
3051 goto error;
3052 }
3053
3054 /* Use temporary output for the session. */
3055 if (output && *output->ctrl_url != '\0') {
3056 ret = snapshot_output_init(output->max_size, output->name,
3057 output->ctrl_url, output->data_url, session->consumer,
3058 &tmp_output, NULL);
3059 if (ret < 0) {
3060 if (ret == -ENOMEM) {
3061 ret = LTTNG_ERR_NOMEM;
3062 } else {
3063 ret = LTTNG_ERR_INVALID;
3064 }
3065 goto error;
3066 }
3067 /* Use the global session count for the temporary snapshot. */
3068 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3069 use_tmp_output = 1;
3070 }
3071
3072 /*
3073 * Get the session maximum size for a snapshot meaning it will compute the
3074 * size of all streams from all domain.
3075 */
3076 max_stream_size = get_session_max_subbuf_size(session);
3077
3078 nb_streams = get_session_nb_streams(session);
3079 if (nb_streams) {
3080 /*
3081 * The maximum size of the snapshot is the number of streams multiplied
3082 * by the biggest subbuf size of all channels in a session which is the
3083 * maximum stream size available for each stream. The session max size
3084 * is now checked against the snapshot max size value given by the user
3085 * and if lower, an error is returned.
3086 */
3087 session_max_size = max_stream_size * nb_streams;
3088 }
3089
3090 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3091 session_max_size, max_stream_size);
3092
3093 /*
3094 * If we use a temporary output, check right away if the max size fits else
3095 * for each output the max size will be checked.
3096 */
3097 if (use_tmp_output &&
3098 (tmp_output.max_size != 0 &&
3099 tmp_output.max_size < session_max_size)) {
3100 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3101 goto error;
3102 }
3103
3104 if (session->kernel_session) {
3105 struct ltt_kernel_session *ksess = session->kernel_session;
3106
3107 if (use_tmp_output) {
3108 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3109 wait, max_stream_size);
3110 if (ret != LTTNG_OK) {
3111 goto error;
3112 }
3113 snapshot_success = 1;
3114 } else {
3115 struct snapshot_output *sout;
3116 struct lttng_ht_iter iter;
3117
3118 rcu_read_lock();
3119 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3120 &iter.iter, sout, node.node) {
3121 /*
3122 * Make a local copy of the output and assign the possible
3123 * temporary value given by the caller.
3124 */
3125 memset(&tmp_output, 0, sizeof(tmp_output));
3126 memcpy(&tmp_output, sout, sizeof(tmp_output));
3127
3128 /* Use temporary max size. */
3129 if (output->max_size != (uint64_t) -1ULL) {
3130 tmp_output.max_size = output->max_size;
3131 }
3132
3133 if (tmp_output.max_size != 0 &&
3134 tmp_output.max_size < session_max_size) {
3135 rcu_read_unlock();
3136 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3137 goto error;
3138 }
3139
3140 /* Use temporary name. */
3141 if (*output->name != '\0') {
3142 strncpy(tmp_output.name, output->name,
3143 sizeof(tmp_output.name));
3144 }
3145
3146 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3147
3148 ret = record_kernel_snapshot(ksess, &tmp_output,
3149 session, wait, max_stream_size);
3150 if (ret != LTTNG_OK) {
3151 rcu_read_unlock();
3152 goto error;
3153 }
3154 snapshot_success = 1;
3155 }
3156 rcu_read_unlock();
3157 }
3158 }
3159
3160 if (session->ust_session) {
3161 struct ltt_ust_session *usess = session->ust_session;
3162
3163 if (use_tmp_output) {
3164 ret = record_ust_snapshot(usess, &tmp_output, session,
3165 wait, max_stream_size);
3166 if (ret != LTTNG_OK) {
3167 goto error;
3168 }
3169 snapshot_success = 1;
3170 } else {
3171 struct snapshot_output *sout;
3172 struct lttng_ht_iter iter;
3173
3174 rcu_read_lock();
3175 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3176 &iter.iter, sout, node.node) {
3177 /*
3178 * Make a local copy of the output and assign the possible
3179 * temporary value given by the caller.
3180 */
3181 memset(&tmp_output, 0, sizeof(tmp_output));
3182 memcpy(&tmp_output, sout, sizeof(tmp_output));
3183
3184 /* Use temporary max size. */
3185 if (output->max_size != (uint64_t) -1ULL) {
3186 tmp_output.max_size = output->max_size;
3187 }
3188
3189 if (tmp_output.max_size != 0 &&
3190 tmp_output.max_size < session_max_size) {
3191 rcu_read_unlock();
3192 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3193 goto error;
3194 }
3195
3196 /* Use temporary name. */
3197 if (*output->name != '\0') {
3198 strncpy(tmp_output.name, output->name,
3199 sizeof(tmp_output.name));
3200 }
3201
3202 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3203
3204 ret = record_ust_snapshot(usess, &tmp_output, session,
3205 wait, max_stream_size);
3206 if (ret != LTTNG_OK) {
3207 rcu_read_unlock();
3208 goto error;
3209 }
3210 snapshot_success = 1;
3211 }
3212 rcu_read_unlock();
3213 }
3214 }
3215
3216 if (snapshot_success) {
3217 session->snapshot.nb_snapshot++;
3218 } else {
3219 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3220 }
3221
3222 error:
3223 return ret;
3224 }
3225
3226 /*
3227 * Init command subsystem.
3228 */
3229 void cmd_init(void)
3230 {
3231 /*
3232 * Set network sequence index to 1 for streams to match a relayd
3233 * socket on the consumer side.
3234 */
3235 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3236 relayd_net_seq_idx = 1;
3237 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3238
3239 DBG("Command subsystem initialized");
3240 }
LTTng 2.0 tools and control repository
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