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Fix: missing rcu_read_lock in cmd_start_trace()
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <inttypes.h>
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
23
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
29
30 #include "channel.h"
31 #include "consumer.h"
32 #include "event.h"
33 #include "health-sessiond.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38
39 #include "cmd.h"
40
41 /*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
46 */
47 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48 static uint64_t relayd_net_seq_idx;
49
50 /*
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
53 */
54 static int build_network_session_path(char *dst, size_t size,
55 struct ltt_session *session)
56 {
57 int ret, kdata_port, udata_port;
58 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
59 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
60
61 assert(session);
62 assert(dst);
63
64 memset(tmp_urls, 0, sizeof(tmp_urls));
65 memset(tmp_uurl, 0, sizeof(tmp_uurl));
66
67 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
68
69 if (session->kernel_session && session->kernel_session->consumer) {
70 kuri = &session->kernel_session->consumer->dst.net.control;
71 kdata_port = session->kernel_session->consumer->dst.net.data.port;
72 }
73
74 if (session->ust_session && session->ust_session->consumer) {
75 uuri = &session->ust_session->consumer->dst.net.control;
76 udata_port = session->ust_session->consumer->dst.net.data.port;
77 }
78
79 if (uuri == NULL && kuri == NULL) {
80 uri = &session->consumer->dst.net.control;
81 kdata_port = session->consumer->dst.net.data.port;
82 } else if (kuri && uuri) {
83 ret = uri_compare(kuri, uuri);
84 if (ret) {
85 /* Not Equal */
86 uri = kuri;
87 /* Build uuri URL string */
88 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
89 if (ret < 0) {
90 goto error;
91 }
92 } else {
93 uri = kuri;
94 }
95 } else if (kuri && uuri == NULL) {
96 uri = kuri;
97 } else if (uuri && kuri == NULL) {
98 uri = uuri;
99 }
100
101 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
102 if (ret < 0) {
103 goto error;
104 }
105
106 /*
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 * to print.
109 */
110 if (*tmp_uurl != '\0') {
111 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls, kdata_port, tmp_uurl, udata_port);
113 } else {
114 int dport;
115 if (kuri || (!kuri && !uuri)) {
116 dport = kdata_port;
117 } else {
118 /* No kernel URI, use the UST port. */
119 dport = udata_port;
120 }
121 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
122 }
123
124 error:
125 return ret;
126 }
127
128 /*
129 * Fill lttng_channel array of all channels.
130 */
131 static void list_lttng_channels(int domain, struct ltt_session *session,
132 struct lttng_channel *channels)
133 {
134 int i = 0;
135 struct ltt_kernel_channel *kchan;
136
137 DBG("Listing channels for session %s", session->name);
138
139 switch (domain) {
140 case LTTNG_DOMAIN_KERNEL:
141 /* Kernel channels */
142 if (session->kernel_session != NULL) {
143 cds_list_for_each_entry(kchan,
144 &session->kernel_session->channel_list.head, list) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
147 channels[i].enabled = kchan->enabled;
148 i++;
149 }
150 }
151 break;
152 case LTTNG_DOMAIN_UST:
153 {
154 struct lttng_ht_iter iter;
155 struct ltt_ust_channel *uchan;
156
157 rcu_read_lock();
158 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
159 &iter.iter, uchan, node.node) {
160 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
161 channels[i].attr.overwrite = uchan->attr.overwrite;
162 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
163 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
164 channels[i].attr.switch_timer_interval =
165 uchan->attr.switch_timer_interval;
166 channels[i].attr.read_timer_interval =
167 uchan->attr.read_timer_interval;
168 channels[i].enabled = uchan->enabled;
169 channels[i].attr.tracefile_size = uchan->tracefile_size;
170 channels[i].attr.tracefile_count = uchan->tracefile_count;
171 switch (uchan->attr.output) {
172 case LTTNG_UST_MMAP:
173 default:
174 channels[i].attr.output = LTTNG_EVENT_MMAP;
175 break;
176 }
177 i++;
178 }
179 rcu_read_unlock();
180 break;
181 }
182 default:
183 break;
184 }
185 }
186
187 /*
188 * Create a list of JUL domain events.
189 *
190 * Return number of events in list on success or else a negative value.
191 */
192 static int list_lttng_jul_events(struct jul_domain *dom,
193 struct lttng_event **events)
194 {
195 int i = 0, ret = 0;
196 unsigned int nb_event = 0;
197 struct jul_event *event;
198 struct lttng_event *tmp_events;
199 struct lttng_ht_iter iter;
200
201 assert(dom);
202 assert(events);
203
204 DBG3("Listing JUL events");
205
206 nb_event = lttng_ht_get_count(dom->events);
207 if (nb_event == 0) {
208 ret = nb_event;
209 goto error;
210 }
211
212 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
213 if (!tmp_events) {
214 PERROR("zmalloc JUL events session");
215 ret = -LTTNG_ERR_FATAL;
216 goto error;
217 }
218
219 rcu_read_lock();
220 cds_lfht_for_each_entry(dom->events->ht, &iter.iter, event, node.node) {
221 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
222 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
223 tmp_events[i].enabled = event->enabled;
224 tmp_events[i].loglevel = event->loglevel;
225 tmp_events[i].loglevel_type = event->loglevel_type;
226 i++;
227 }
228 rcu_read_unlock();
229
230 *events = tmp_events;
231 ret = nb_event;
232
233 error:
234 assert(nb_event == i);
235 return ret;
236 }
237
238 /*
239 * Create a list of ust global domain events.
240 */
241 static int list_lttng_ust_global_events(char *channel_name,
242 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
243 {
244 int i = 0, ret = 0;
245 unsigned int nb_event = 0;
246 struct lttng_ht_iter iter;
247 struct lttng_ht_node_str *node;
248 struct ltt_ust_channel *uchan;
249 struct ltt_ust_event *uevent;
250 struct lttng_event *tmp;
251
252 DBG("Listing UST global events for channel %s", channel_name);
253
254 rcu_read_lock();
255
256 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
257 node = lttng_ht_iter_get_node_str(&iter);
258 if (node == NULL) {
259 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
260 goto error;
261 }
262
263 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
264
265 nb_event += lttng_ht_get_count(uchan->events);
266
267 if (nb_event == 0) {
268 ret = nb_event;
269 goto error;
270 }
271
272 DBG3("Listing UST global %d events", nb_event);
273
274 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
275 if (tmp == NULL) {
276 ret = LTTNG_ERR_FATAL;
277 goto error;
278 }
279
280 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
281 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
282 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
283 tmp[i].enabled = uevent->enabled;
284
285 switch (uevent->attr.instrumentation) {
286 case LTTNG_UST_TRACEPOINT:
287 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
288 break;
289 case LTTNG_UST_PROBE:
290 tmp[i].type = LTTNG_EVENT_PROBE;
291 break;
292 case LTTNG_UST_FUNCTION:
293 tmp[i].type = LTTNG_EVENT_FUNCTION;
294 break;
295 }
296
297 tmp[i].loglevel = uevent->attr.loglevel;
298 switch (uevent->attr.loglevel_type) {
299 case LTTNG_UST_LOGLEVEL_ALL:
300 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
301 break;
302 case LTTNG_UST_LOGLEVEL_RANGE:
303 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
304 break;
305 case LTTNG_UST_LOGLEVEL_SINGLE:
306 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
307 break;
308 }
309 if (uevent->filter) {
310 tmp[i].filter = 1;
311 }
312 if (uevent->exclusion) {
313 tmp[i].exclusion = 1;
314 }
315 i++;
316 }
317
318 ret = nb_event;
319 *events = tmp;
320
321 error:
322 rcu_read_unlock();
323 return ret;
324 }
325
326 /*
327 * Fill lttng_event array of all kernel events in the channel.
328 */
329 static int list_lttng_kernel_events(char *channel_name,
330 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
331 {
332 int i = 0, ret;
333 unsigned int nb_event;
334 struct ltt_kernel_event *event;
335 struct ltt_kernel_channel *kchan;
336
337 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
338 if (kchan == NULL) {
339 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
340 goto error;
341 }
342
343 nb_event = kchan->event_count;
344
345 DBG("Listing events for channel %s", kchan->channel->name);
346
347 if (nb_event == 0) {
348 goto end;
349 }
350
351 *events = zmalloc(nb_event * sizeof(struct lttng_event));
352 if (*events == NULL) {
353 ret = LTTNG_ERR_FATAL;
354 goto error;
355 }
356
357 /* Kernel channels */
358 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
359 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
360 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
361 (*events)[i].enabled = event->enabled;
362
363 switch (event->event->instrumentation) {
364 case LTTNG_KERNEL_TRACEPOINT:
365 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
366 break;
367 case LTTNG_KERNEL_KRETPROBE:
368 (*events)[i].type = LTTNG_EVENT_FUNCTION;
369 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
370 sizeof(struct lttng_kernel_kprobe));
371 break;
372 case LTTNG_KERNEL_KPROBE:
373 (*events)[i].type = LTTNG_EVENT_PROBE;
374 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
375 sizeof(struct lttng_kernel_kprobe));
376 break;
377 case LTTNG_KERNEL_FUNCTION:
378 (*events)[i].type = LTTNG_EVENT_FUNCTION;
379 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
380 sizeof(struct lttng_kernel_function));
381 break;
382 case LTTNG_KERNEL_NOOP:
383 (*events)[i].type = LTTNG_EVENT_NOOP;
384 break;
385 case LTTNG_KERNEL_SYSCALL:
386 (*events)[i].type = LTTNG_EVENT_SYSCALL;
387 break;
388 case LTTNG_KERNEL_ALL:
389 assert(0);
390 break;
391 }
392 i++;
393 }
394
395 end:
396 return nb_event;
397
398 error:
399 /* Negate the error code to differentiate the size from an error */
400 return -ret;
401 }
402
403 /*
404 * Add URI so the consumer output object. Set the correct path depending on the
405 * domain adding the default trace directory.
406 */
407 static int add_uri_to_consumer(struct consumer_output *consumer,
408 struct lttng_uri *uri, int domain, const char *session_name)
409 {
410 int ret = LTTNG_OK;
411 const char *default_trace_dir;
412
413 assert(uri);
414
415 if (consumer == NULL) {
416 DBG("No consumer detected. Don't add URI. Stopping.");
417 ret = LTTNG_ERR_NO_CONSUMER;
418 goto error;
419 }
420
421 switch (domain) {
422 case LTTNG_DOMAIN_KERNEL:
423 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
424 break;
425 case LTTNG_DOMAIN_UST:
426 default_trace_dir = DEFAULT_UST_TRACE_DIR;
427 break;
428 default:
429 /*
430 * This case is possible is we try to add the URI to the global tracing
431 * session consumer object which in this case there is no subdir.
432 */
433 default_trace_dir = "";
434 }
435
436 switch (uri->dtype) {
437 case LTTNG_DST_IPV4:
438 case LTTNG_DST_IPV6:
439 DBG2("Setting network URI to consumer");
440
441 if (consumer->type == CONSUMER_DST_NET) {
442 if ((uri->stype == LTTNG_STREAM_CONTROL &&
443 consumer->dst.net.control_isset) ||
444 (uri->stype == LTTNG_STREAM_DATA &&
445 consumer->dst.net.data_isset)) {
446 ret = LTTNG_ERR_URL_EXIST;
447 goto error;
448 }
449 } else {
450 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
451 }
452
453 consumer->type = CONSUMER_DST_NET;
454
455 /* Set URI into consumer output object */
456 ret = consumer_set_network_uri(consumer, uri);
457 if (ret < 0) {
458 ret = -ret;
459 goto error;
460 } else if (ret == 1) {
461 /*
462 * URI was the same in the consumer so we do not append the subdir
463 * again so to not duplicate output dir.
464 */
465 ret = LTTNG_OK;
466 goto error;
467 }
468
469 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
470 ret = consumer_set_subdir(consumer, session_name);
471 if (ret < 0) {
472 ret = LTTNG_ERR_FATAL;
473 goto error;
474 }
475 }
476
477 if (uri->stype == LTTNG_STREAM_CONTROL) {
478 /* On a new subdir, reappend the default trace dir. */
479 strncat(consumer->subdir, default_trace_dir,
480 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
481 DBG3("Append domain trace name to subdir %s", consumer->subdir);
482 }
483
484 break;
485 case LTTNG_DST_PATH:
486 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
487 memset(consumer->dst.trace_path, 0,
488 sizeof(consumer->dst.trace_path));
489 strncpy(consumer->dst.trace_path, uri->dst.path,
490 sizeof(consumer->dst.trace_path));
491 /* Append default trace dir */
492 strncat(consumer->dst.trace_path, default_trace_dir,
493 sizeof(consumer->dst.trace_path) -
494 strlen(consumer->dst.trace_path) - 1);
495 /* Flag consumer as local. */
496 consumer->type = CONSUMER_DST_LOCAL;
497 break;
498 }
499
500 ret = LTTNG_OK;
501
502 error:
503 return ret;
504 }
505
506 /*
507 * Init tracing by creating trace directory and sending fds kernel consumer.
508 */
509 static int init_kernel_tracing(struct ltt_kernel_session *session)
510 {
511 int ret = 0;
512 struct lttng_ht_iter iter;
513 struct consumer_socket *socket;
514
515 assert(session);
516
517 rcu_read_lock();
518
519 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
520 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
521 socket, node.node) {
522 pthread_mutex_lock(socket->lock);
523 ret = kernel_consumer_send_session(socket, session);
524 pthread_mutex_unlock(socket->lock);
525 if (ret < 0) {
526 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
527 goto error;
528 }
529 }
530 }
531
532 error:
533 rcu_read_unlock();
534 return ret;
535 }
536
537 /*
538 * Create a socket to the relayd using the URI.
539 *
540 * On success, the relayd_sock pointer is set to the created socket.
541 * Else, it's stays untouched and a lttcomm error code is returned.
542 */
543 static int create_connect_relayd(struct lttng_uri *uri,
544 struct lttcomm_relayd_sock **relayd_sock)
545 {
546 int ret;
547 struct lttcomm_relayd_sock *rsock;
548
549 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
550 RELAYD_VERSION_COMM_MINOR);
551 if (!rsock) {
552 ret = LTTNG_ERR_FATAL;
553 goto error;
554 }
555
556 /*
557 * Connect to relayd so we can proceed with a session creation. This call
558 * can possibly block for an arbitrary amount of time to set the health
559 * state to be in poll execution.
560 */
561 health_poll_entry();
562 ret = relayd_connect(rsock);
563 health_poll_exit();
564 if (ret < 0) {
565 ERR("Unable to reach lttng-relayd");
566 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
567 goto free_sock;
568 }
569
570 /* Create socket for control stream. */
571 if (uri->stype == LTTNG_STREAM_CONTROL) {
572 DBG3("Creating relayd stream socket from URI");
573
574 /* Check relayd version */
575 ret = relayd_version_check(rsock);
576 if (ret < 0) {
577 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
578 goto close_sock;
579 }
580 } else if (uri->stype == LTTNG_STREAM_DATA) {
581 DBG3("Creating relayd data socket from URI");
582 } else {
583 /* Command is not valid */
584 ERR("Relayd invalid stream type: %d", uri->stype);
585 ret = LTTNG_ERR_INVALID;
586 goto close_sock;
587 }
588
589 *relayd_sock = rsock;
590
591 return LTTNG_OK;
592
593 close_sock:
594 /* The returned value is not useful since we are on an error path. */
595 (void) relayd_close(rsock);
596 free_sock:
597 free(rsock);
598 error:
599 return ret;
600 }
601
602 /*
603 * Connect to the relayd using URI and send the socket to the right consumer.
604 */
605 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
606 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
607 struct consumer_socket *consumer_sock,
608 char *session_name, char *hostname, int session_live_timer)
609 {
610 int ret;
611 struct lttcomm_relayd_sock *rsock = NULL;
612
613 /* Connect to relayd and make version check if uri is the control. */
614 ret = create_connect_relayd(relayd_uri, &rsock);
615 if (ret != LTTNG_OK) {
616 goto error;
617 }
618 assert(rsock);
619
620 /* Set the network sequence index if not set. */
621 if (consumer->net_seq_index == (uint64_t) -1ULL) {
622 pthread_mutex_lock(&relayd_net_seq_idx_lock);
623 /*
624 * Increment net_seq_idx because we are about to transfer the
625 * new relayd socket to the consumer.
626 * Assign unique key so the consumer can match streams.
627 */
628 consumer->net_seq_index = ++relayd_net_seq_idx;
629 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
630 }
631
632 /* Send relayd socket to consumer. */
633 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
634 relayd_uri->stype, session_id,
635 session_name, hostname, session_live_timer);
636 if (ret < 0) {
637 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
638 goto close_sock;
639 }
640
641 /* Flag that the corresponding socket was sent. */
642 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
643 consumer_sock->control_sock_sent = 1;
644 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
645 consumer_sock->data_sock_sent = 1;
646 }
647
648 ret = LTTNG_OK;
649
650 /*
651 * Close socket which was dup on the consumer side. The session daemon does
652 * NOT keep track of the relayd socket(s) once transfer to the consumer.
653 */
654
655 close_sock:
656 (void) relayd_close(rsock);
657 free(rsock);
658
659 error:
660 if (ret != LTTNG_OK) {
661 /*
662 * The consumer output for this session should not be used anymore
663 * since the relayd connection failed thus making any tracing or/and
664 * streaming not usable.
665 */
666 consumer->enabled = 0;
667 }
668 return ret;
669 }
670
671 /*
672 * Send both relayd sockets to a specific consumer and domain. This is a
673 * helper function to facilitate sending the information to the consumer for a
674 * session.
675 */
676 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
677 struct consumer_output *consumer, struct consumer_socket *sock,
678 char *session_name, char *hostname, int session_live_timer)
679 {
680 int ret = LTTNG_OK;
681
682 assert(consumer);
683 assert(sock);
684
685 /* Sending control relayd socket. */
686 if (!sock->control_sock_sent) {
687 ret = send_consumer_relayd_socket(domain, session_id,
688 &consumer->dst.net.control, consumer, sock,
689 session_name, hostname, session_live_timer);
690 if (ret != LTTNG_OK) {
691 goto error;
692 }
693 }
694
695 /* Sending data relayd socket. */
696 if (!sock->data_sock_sent) {
697 ret = send_consumer_relayd_socket(domain, session_id,
698 &consumer->dst.net.data, consumer, sock,
699 session_name, hostname, session_live_timer);
700 if (ret != LTTNG_OK) {
701 goto error;
702 }
703 }
704
705 error:
706 return ret;
707 }
708
709 /*
710 * Setup relayd connections for a tracing session. First creates the socket to
711 * the relayd and send them to the right domain consumer. Consumer type MUST be
712 * network.
713 */
714 int cmd_setup_relayd(struct ltt_session *session)
715 {
716 int ret = LTTNG_OK;
717 struct ltt_ust_session *usess;
718 struct ltt_kernel_session *ksess;
719 struct consumer_socket *socket;
720 struct lttng_ht_iter iter;
721
722 assert(session);
723
724 usess = session->ust_session;
725 ksess = session->kernel_session;
726
727 DBG("Setting relayd for session %s", session->name);
728
729 rcu_read_lock();
730
731 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
732 && usess->consumer->enabled) {
733 /* For each consumer socket, send relayd sockets */
734 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
735 socket, node.node) {
736 pthread_mutex_lock(socket->lock);
737 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
738 usess->consumer, socket,
739 session->name, session->hostname,
740 session->live_timer);
741 pthread_mutex_unlock(socket->lock);
742 if (ret != LTTNG_OK) {
743 goto error;
744 }
745 /* Session is now ready for network streaming. */
746 session->net_handle = 1;
747 }
748 }
749
750 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
751 && ksess->consumer->enabled) {
752 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
753 socket, node.node) {
754 pthread_mutex_lock(socket->lock);
755 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
756 ksess->consumer, socket,
757 session->name, session->hostname,
758 session->live_timer);
759 pthread_mutex_unlock(socket->lock);
760 if (ret != LTTNG_OK) {
761 goto error;
762 }
763 /* Session is now ready for network streaming. */
764 session->net_handle = 1;
765 }
766 }
767
768 error:
769 rcu_read_unlock();
770 return ret;
771 }
772
773 /*
774 * Start a kernel session by opening all necessary streams.
775 */
776 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
777 {
778 int ret;
779 struct ltt_kernel_channel *kchan;
780
781 /* Open kernel metadata */
782 if (ksess->metadata == NULL && ksess->output_traces) {
783 ret = kernel_open_metadata(ksess);
784 if (ret < 0) {
785 ret = LTTNG_ERR_KERN_META_FAIL;
786 goto error;
787 }
788 }
789
790 /* Open kernel metadata stream */
791 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
792 ret = kernel_open_metadata_stream(ksess);
793 if (ret < 0) {
794 ERR("Kernel create metadata stream failed");
795 ret = LTTNG_ERR_KERN_STREAM_FAIL;
796 goto error;
797 }
798 }
799
800 /* For each channel */
801 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
802 if (kchan->stream_count == 0) {
803 ret = kernel_open_channel_stream(kchan);
804 if (ret < 0) {
805 ret = LTTNG_ERR_KERN_STREAM_FAIL;
806 goto error;
807 }
808 /* Update the stream global counter */
809 ksess->stream_count_global += ret;
810 }
811 }
812
813 /* Setup kernel consumer socket and send fds to it */
814 ret = init_kernel_tracing(ksess);
815 if (ret != 0) {
816 ret = LTTNG_ERR_KERN_START_FAIL;
817 goto error;
818 }
819
820 /* This start the kernel tracing */
821 ret = kernel_start_session(ksess);
822 if (ret < 0) {
823 ret = LTTNG_ERR_KERN_START_FAIL;
824 goto error;
825 }
826
827 /* Quiescent wait after starting trace */
828 kernel_wait_quiescent(kernel_tracer_fd);
829
830 ksess->active = 1;
831
832 ret = LTTNG_OK;
833
834 error:
835 return ret;
836 }
837
838 /*
839 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
840 */
841 int cmd_disable_channel(struct ltt_session *session, int domain,
842 char *channel_name)
843 {
844 int ret;
845 struct ltt_ust_session *usess;
846
847 usess = session->ust_session;
848
849 rcu_read_lock();
850
851 switch (domain) {
852 case LTTNG_DOMAIN_KERNEL:
853 {
854 ret = channel_kernel_disable(session->kernel_session,
855 channel_name);
856 if (ret != LTTNG_OK) {
857 goto error;
858 }
859
860 kernel_wait_quiescent(kernel_tracer_fd);
861 break;
862 }
863 case LTTNG_DOMAIN_UST:
864 {
865 struct ltt_ust_channel *uchan;
866 struct lttng_ht *chan_ht;
867
868 chan_ht = usess->domain_global.channels;
869
870 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
871 if (uchan == NULL) {
872 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
873 goto error;
874 }
875
876 ret = channel_ust_disable(usess, uchan);
877 if (ret != LTTNG_OK) {
878 goto error;
879 }
880 break;
881 }
882 #if 0
883 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
884 case LTTNG_DOMAIN_UST_EXEC_NAME:
885 case LTTNG_DOMAIN_UST_PID:
886 #endif
887 default:
888 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
889 goto error;
890 }
891
892 ret = LTTNG_OK;
893
894 error:
895 rcu_read_unlock();
896 return ret;
897 }
898
899 /*
900 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
901 *
902 * The wpipe arguments is used as a notifier for the kernel thread.
903 */
904 int cmd_enable_channel(struct ltt_session *session,
905 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
906 {
907 int ret;
908 struct ltt_ust_session *usess = session->ust_session;
909 struct lttng_ht *chan_ht;
910
911 assert(session);
912 assert(attr);
913 assert(domain);
914
915 DBG("Enabling channel %s for session %s", attr->name, session->name);
916
917 rcu_read_lock();
918
919 /*
920 * Don't try to enable a channel if the session has been started at
921 * some point in time before. The tracer does not allow it.
922 */
923 if (session->has_been_started) {
924 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
925 goto error;
926 }
927
928 /*
929 * If the session is a live session, remove the switch timer, the
930 * live timer does the same thing but sends also synchronisation
931 * beacons for inactive streams.
932 */
933 if (session->live_timer > 0) {
934 attr->attr.live_timer_interval = session->live_timer;
935 attr->attr.switch_timer_interval = 0;
936 }
937
938 /*
939 * The ringbuffer (both in user space and kernel) behave badly in overwrite
940 * mode and with less than 2 subbuf so block it right away and send back an
941 * invalid attribute error.
942 */
943 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
944 ret = LTTNG_ERR_INVALID;
945 goto error;
946 }
947
948 switch (domain->type) {
949 case LTTNG_DOMAIN_KERNEL:
950 {
951 struct ltt_kernel_channel *kchan;
952
953 kchan = trace_kernel_get_channel_by_name(attr->name,
954 session->kernel_session);
955 if (kchan == NULL) {
956 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
957 if (attr->name[0] != '\0') {
958 session->kernel_session->has_non_default_channel = 1;
959 }
960 } else {
961 ret = channel_kernel_enable(session->kernel_session, kchan);
962 }
963
964 if (ret != LTTNG_OK) {
965 goto error;
966 }
967
968 kernel_wait_quiescent(kernel_tracer_fd);
969 break;
970 }
971 case LTTNG_DOMAIN_UST:
972 {
973 struct ltt_ust_channel *uchan;
974
975 chan_ht = usess->domain_global.channels;
976
977 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
978 if (uchan == NULL) {
979 ret = channel_ust_create(usess, attr, domain->buf_type);
980 if (attr->name[0] != '\0') {
981 usess->has_non_default_channel = 1;
982 }
983 } else {
984 ret = channel_ust_enable(usess, uchan);
985 }
986 break;
987 }
988 default:
989 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
990 goto error;
991 }
992
993 error:
994 rcu_read_unlock();
995 return ret;
996 }
997
998
999 /*
1000 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1001 */
1002 int cmd_disable_event(struct ltt_session *session, int domain,
1003 char *channel_name, char *event_name)
1004 {
1005 int ret;
1006
1007 rcu_read_lock();
1008
1009 switch (domain) {
1010 case LTTNG_DOMAIN_KERNEL:
1011 {
1012 struct ltt_kernel_channel *kchan;
1013 struct ltt_kernel_session *ksess;
1014
1015 ksess = session->kernel_session;
1016
1017 /*
1018 * If a non-default channel has been created in the
1019 * session, explicitely require that -c chan_name needs
1020 * to be provided.
1021 */
1022 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1023 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1024 goto error;
1025 }
1026
1027 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1028 if (kchan == NULL) {
1029 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1030 goto error;
1031 }
1032
1033 ret = event_kernel_disable_tracepoint(kchan, event_name);
1034 if (ret != LTTNG_OK) {
1035 goto error;
1036 }
1037
1038 kernel_wait_quiescent(kernel_tracer_fd);
1039 break;
1040 }
1041 case LTTNG_DOMAIN_UST:
1042 {
1043 struct ltt_ust_channel *uchan;
1044 struct ltt_ust_session *usess;
1045
1046 usess = session->ust_session;
1047
1048 /*
1049 * If a non-default channel has been created in the
1050 * session, explicitely require that -c chan_name needs
1051 * to be provided.
1052 */
1053 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1054 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1055 goto error;
1056 }
1057
1058 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1059 channel_name);
1060 if (uchan == NULL) {
1061 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1062 goto error;
1063 }
1064
1065 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1066 if (ret != LTTNG_OK) {
1067 goto error;
1068 }
1069
1070 DBG3("Disable UST event %s in channel %s completed", event_name,
1071 channel_name);
1072 break;
1073 }
1074 case LTTNG_DOMAIN_JUL:
1075 {
1076 struct ltt_ust_session *usess = session->ust_session;
1077
1078 assert(usess);
1079
1080 ret = event_jul_disable(usess, event_name);
1081 if (ret != LTTNG_OK) {
1082 goto error;
1083 }
1084
1085 break;
1086 }
1087 #if 0
1088 case LTTNG_DOMAIN_UST_EXEC_NAME:
1089 case LTTNG_DOMAIN_UST_PID:
1090 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1091 #endif
1092 default:
1093 ret = LTTNG_ERR_UND;
1094 goto error;
1095 }
1096
1097 ret = LTTNG_OK;
1098
1099 error:
1100 rcu_read_unlock();
1101 return ret;
1102 }
1103
1104 /*
1105 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1106 */
1107 int cmd_disable_event_all(struct ltt_session *session, int domain,
1108 char *channel_name)
1109 {
1110 int ret;
1111
1112 rcu_read_lock();
1113
1114 switch (domain) {
1115 case LTTNG_DOMAIN_KERNEL:
1116 {
1117 struct ltt_kernel_session *ksess;
1118 struct ltt_kernel_channel *kchan;
1119
1120 ksess = session->kernel_session;
1121
1122 /*
1123 * If a non-default channel has been created in the
1124 * session, explicitely require that -c chan_name needs
1125 * to be provided.
1126 */
1127 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1128 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1129 goto error;
1130 }
1131
1132 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1133 if (kchan == NULL) {
1134 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1135 goto error;
1136 }
1137
1138 ret = event_kernel_disable_all(kchan);
1139 if (ret != LTTNG_OK) {
1140 goto error;
1141 }
1142
1143 kernel_wait_quiescent(kernel_tracer_fd);
1144 break;
1145 }
1146 case LTTNG_DOMAIN_UST:
1147 {
1148 struct ltt_ust_session *usess;
1149 struct ltt_ust_channel *uchan;
1150
1151 usess = session->ust_session;
1152
1153 /*
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1156 * to be provided.
1157 */
1158 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1159 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1160 goto error;
1161 }
1162
1163 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1164 channel_name);
1165 if (uchan == NULL) {
1166 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1167 goto error;
1168 }
1169
1170 ret = event_ust_disable_all_tracepoints(usess, uchan);
1171 if (ret != 0) {
1172 goto error;
1173 }
1174
1175 DBG3("Disable all UST events in channel %s completed", channel_name);
1176
1177 break;
1178 }
1179 case LTTNG_DOMAIN_JUL:
1180 {
1181 struct ltt_ust_session *usess = session->ust_session;
1182
1183 assert(usess);
1184
1185 ret = event_jul_disable_all(usess);
1186 if (ret != LTTNG_OK) {
1187 goto error;
1188 }
1189
1190 break;
1191 }
1192 #if 0
1193 case LTTNG_DOMAIN_UST_EXEC_NAME:
1194 case LTTNG_DOMAIN_UST_PID:
1195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1196 #endif
1197 default:
1198 ret = LTTNG_ERR_UND;
1199 goto error;
1200 }
1201
1202 ret = LTTNG_OK;
1203
1204 error:
1205 rcu_read_unlock();
1206 return ret;
1207 }
1208
1209 /*
1210 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1211 */
1212 int cmd_add_context(struct ltt_session *session, int domain,
1213 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1214 {
1215 int ret, chan_kern_created = 0, chan_ust_created = 0;
1216
1217 switch (domain) {
1218 case LTTNG_DOMAIN_KERNEL:
1219 assert(session->kernel_session);
1220
1221 if (session->kernel_session->channel_count == 0) {
1222 /* Create default channel */
1223 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1224 if (ret != LTTNG_OK) {
1225 goto error;
1226 }
1227 chan_kern_created = 1;
1228 }
1229 /* Add kernel context to kernel tracer */
1230 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1231 if (ret != LTTNG_OK) {
1232 goto error;
1233 }
1234 break;
1235 case LTTNG_DOMAIN_UST:
1236 {
1237 struct ltt_ust_session *usess = session->ust_session;
1238 unsigned int chan_count;
1239
1240 assert(usess);
1241
1242 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1243 if (chan_count == 0) {
1244 struct lttng_channel *attr;
1245 /* Create default channel */
1246 attr = channel_new_default_attr(domain, usess->buffer_type);
1247 if (attr == NULL) {
1248 ret = LTTNG_ERR_FATAL;
1249 goto error;
1250 }
1251
1252 ret = channel_ust_create(usess, attr, usess->buffer_type);
1253 if (ret != LTTNG_OK) {
1254 free(attr);
1255 goto error;
1256 }
1257 free(attr);
1258 chan_ust_created = 1;
1259 }
1260
1261 ret = context_ust_add(usess, domain, ctx, channel_name);
1262 if (ret != LTTNG_OK) {
1263 goto error;
1264 }
1265 break;
1266 }
1267 #if 0
1268 case LTTNG_DOMAIN_UST_EXEC_NAME:
1269 case LTTNG_DOMAIN_UST_PID:
1270 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1271 #endif
1272 default:
1273 ret = LTTNG_ERR_UND;
1274 goto error;
1275 }
1276
1277 return LTTNG_OK;
1278
1279 error:
1280 if (chan_kern_created) {
1281 struct ltt_kernel_channel *kchan =
1282 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1283 session->kernel_session);
1284 /* Created previously, this should NOT fail. */
1285 assert(kchan);
1286 kernel_destroy_channel(kchan);
1287 }
1288
1289 if (chan_ust_created) {
1290 struct ltt_ust_channel *uchan =
1291 trace_ust_find_channel_by_name(
1292 session->ust_session->domain_global.channels,
1293 DEFAULT_CHANNEL_NAME);
1294 /* Created previously, this should NOT fail. */
1295 assert(uchan);
1296 /* Remove from the channel list of the session. */
1297 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1298 uchan);
1299 trace_ust_destroy_channel(uchan);
1300 }
1301 return ret;
1302 }
1303
1304 /*
1305 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1306 */
1307 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1308 char *channel_name, struct lttng_event *event,
1309 char *filter_expression,
1310 struct lttng_filter_bytecode *filter,
1311 struct lttng_event_exclusion *exclusion,
1312 int wpipe)
1313 {
1314 int ret, channel_created = 0;
1315 struct lttng_channel *attr;
1316
1317 assert(session);
1318 assert(event);
1319 assert(channel_name);
1320
1321 rcu_read_lock();
1322
1323 switch (domain->type) {
1324 case LTTNG_DOMAIN_KERNEL:
1325 {
1326 struct ltt_kernel_channel *kchan;
1327
1328 /*
1329 * If a non-default channel has been created in the
1330 * session, explicitely require that -c chan_name needs
1331 * to be provided.
1332 */
1333 if (session->kernel_session->has_non_default_channel
1334 && channel_name[0] == '\0') {
1335 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1336 goto error;
1337 }
1338
1339 kchan = trace_kernel_get_channel_by_name(channel_name,
1340 session->kernel_session);
1341 if (kchan == NULL) {
1342 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1343 LTTNG_BUFFER_GLOBAL);
1344 if (attr == NULL) {
1345 ret = LTTNG_ERR_FATAL;
1346 goto error;
1347 }
1348 strncpy(attr->name, channel_name, sizeof(attr->name));
1349
1350 ret = cmd_enable_channel(session, domain, attr, wpipe);
1351 if (ret != LTTNG_OK) {
1352 free(attr);
1353 goto error;
1354 }
1355 free(attr);
1356
1357 channel_created = 1;
1358 }
1359
1360 /* Get the newly created kernel channel pointer */
1361 kchan = trace_kernel_get_channel_by_name(channel_name,
1362 session->kernel_session);
1363 if (kchan == NULL) {
1364 /* This sould not happen... */
1365 ret = LTTNG_ERR_FATAL;
1366 goto error;
1367 }
1368
1369 ret = event_kernel_enable_tracepoint(kchan, event);
1370 if (ret != LTTNG_OK) {
1371 if (channel_created) {
1372 /* Let's not leak a useless channel. */
1373 kernel_destroy_channel(kchan);
1374 }
1375 goto error;
1376 }
1377
1378 kernel_wait_quiescent(kernel_tracer_fd);
1379 break;
1380 }
1381 case LTTNG_DOMAIN_UST:
1382 {
1383 struct ltt_ust_channel *uchan;
1384 struct ltt_ust_session *usess = session->ust_session;
1385
1386 assert(usess);
1387
1388 /*
1389 * If a non-default channel has been created in the
1390 * session, explicitely require that -c chan_name needs
1391 * to be provided.
1392 */
1393 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1394 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1395 goto error;
1396 }
1397
1398 /* Get channel from global UST domain */
1399 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1400 channel_name);
1401 if (uchan == NULL) {
1402 /* Create default channel */
1403 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1404 usess->buffer_type);
1405 if (attr == NULL) {
1406 ret = LTTNG_ERR_FATAL;
1407 goto error;
1408 }
1409 strncpy(attr->name, channel_name, sizeof(attr->name));
1410
1411 ret = cmd_enable_channel(session, domain, attr, wpipe);
1412 if (ret != LTTNG_OK) {
1413 free(attr);
1414 goto error;
1415 }
1416 free(attr);
1417
1418 /* Get the newly created channel reference back */
1419 uchan = trace_ust_find_channel_by_name(
1420 usess->domain_global.channels, channel_name);
1421 assert(uchan);
1422 }
1423
1424 /* At this point, the session and channel exist on the tracer */
1425 ret = event_ust_enable_tracepoint(usess, uchan, event,
1426 filter_expression, filter, exclusion);
1427 if (ret != LTTNG_OK) {
1428 goto error;
1429 }
1430 break;
1431 }
1432 case LTTNG_DOMAIN_JUL:
1433 {
1434 struct lttng_event uevent;
1435 struct lttng_domain tmp_dom;
1436 struct ltt_ust_session *usess = session->ust_session;
1437
1438 assert(usess);
1439
1440 /* Create the default JUL tracepoint. */
1441 memset(&uevent, 0, sizeof(uevent));
1442 uevent.type = LTTNG_EVENT_TRACEPOINT;
1443 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1444 if (is_root) {
1445 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1446 sizeof(uevent.name));
1447 } else {
1448 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1449 sizeof(uevent.name));
1450 }
1451 uevent.name[sizeof(uevent.name) - 1] = '\0';
1452
1453 /*
1454 * The domain type is changed because we are about to enable the
1455 * default channel and event for the JUL domain that are hardcoded.
1456 * This happens in the UST domain.
1457 */
1458 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1459 tmp_dom.type = LTTNG_DOMAIN_UST;
1460
1461 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1462 &uevent, filter_expression, filter, NULL, wpipe);
1463 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1464 goto error;
1465 }
1466
1467 /* The wild card * means that everything should be enabled. */
1468 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1469 ret = event_jul_enable_all(usess, event, filter);
1470 } else {
1471 ret = event_jul_enable(usess, event, filter);
1472 }
1473 if (ret != LTTNG_OK) {
1474 goto error;
1475 }
1476
1477 break;
1478 }
1479 #if 0
1480 case LTTNG_DOMAIN_UST_EXEC_NAME:
1481 case LTTNG_DOMAIN_UST_PID:
1482 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1483 #endif
1484 default:
1485 ret = LTTNG_ERR_UND;
1486 goto error;
1487 }
1488
1489 ret = LTTNG_OK;
1490
1491 error:
1492 rcu_read_unlock();
1493 return ret;
1494 }
1495
1496 /*
1497 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1498 */
1499 int cmd_enable_event_all(struct ltt_session *session,
1500 struct lttng_domain *domain, char *channel_name, int event_type,
1501 char *filter_expression,
1502 struct lttng_filter_bytecode *filter, int wpipe)
1503 {
1504 int ret;
1505 struct lttng_channel *attr;
1506
1507 assert(session);
1508 assert(channel_name);
1509
1510 rcu_read_lock();
1511
1512 switch (domain->type) {
1513 case LTTNG_DOMAIN_KERNEL:
1514 {
1515 struct ltt_kernel_channel *kchan;
1516
1517 assert(session->kernel_session);
1518
1519 /*
1520 * If a non-default channel has been created in the
1521 * session, explicitely require that -c chan_name needs
1522 * to be provided.
1523 */
1524 if (session->kernel_session->has_non_default_channel
1525 && channel_name[0] == '\0') {
1526 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1527 goto error;
1528 }
1529
1530 kchan = trace_kernel_get_channel_by_name(channel_name,
1531 session->kernel_session);
1532 if (kchan == NULL) {
1533 /* Create default channel */
1534 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1535 LTTNG_BUFFER_GLOBAL);
1536 if (attr == NULL) {
1537 ret = LTTNG_ERR_FATAL;
1538 goto error;
1539 }
1540 strncpy(attr->name, channel_name, sizeof(attr->name));
1541
1542 ret = cmd_enable_channel(session, domain, attr, wpipe);
1543 if (ret != LTTNG_OK) {
1544 free(attr);
1545 goto error;
1546 }
1547 free(attr);
1548
1549 /* Get the newly created kernel channel pointer */
1550 kchan = trace_kernel_get_channel_by_name(channel_name,
1551 session->kernel_session);
1552 assert(kchan);
1553 }
1554
1555 switch (event_type) {
1556 case LTTNG_EVENT_SYSCALL:
1557 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1558 break;
1559 case LTTNG_EVENT_TRACEPOINT:
1560 /*
1561 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1562 * events already registered to the channel.
1563 */
1564 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1565 break;
1566 case LTTNG_EVENT_ALL:
1567 /* Enable syscalls and tracepoints */
1568 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1569 break;
1570 default:
1571 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1572 goto error;
1573 }
1574
1575 /* Manage return value */
1576 if (ret != LTTNG_OK) {
1577 /*
1578 * On error, cmd_enable_channel call will take care of destroying
1579 * the created channel if it was needed.
1580 */
1581 goto error;
1582 }
1583
1584 kernel_wait_quiescent(kernel_tracer_fd);
1585 break;
1586 }
1587 case LTTNG_DOMAIN_UST:
1588 {
1589 struct ltt_ust_channel *uchan;
1590 struct ltt_ust_session *usess = session->ust_session;
1591
1592 assert(usess);
1593
1594 /*
1595 * If a non-default channel has been created in the
1596 * session, explicitely require that -c chan_name needs
1597 * to be provided.
1598 */
1599 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1600 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1601 goto error;
1602 }
1603
1604 /* Get channel from global UST domain */
1605 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1606 channel_name);
1607 if (uchan == NULL) {
1608 /* Create default channel */
1609 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1610 usess->buffer_type);
1611 if (attr == NULL) {
1612 ret = LTTNG_ERR_FATAL;
1613 goto error;
1614 }
1615 strncpy(attr->name, channel_name, sizeof(attr->name));
1616
1617 ret = cmd_enable_channel(session, domain, attr, wpipe);
1618 if (ret != LTTNG_OK) {
1619 free(attr);
1620 goto error;
1621 }
1622 free(attr);
1623
1624 /* Get the newly created channel reference back */
1625 uchan = trace_ust_find_channel_by_name(
1626 usess->domain_global.channels, channel_name);
1627 assert(uchan);
1628 }
1629
1630 /* At this point, the session and channel exist on the tracer */
1631
1632 switch (event_type) {
1633 case LTTNG_EVENT_ALL:
1634 case LTTNG_EVENT_TRACEPOINT:
1635 ret = event_ust_enable_all_tracepoints(usess, uchan,
1636 filter_expression, filter);
1637 if (ret != LTTNG_OK) {
1638 goto error;
1639 }
1640 break;
1641 default:
1642 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1643 goto error;
1644 }
1645
1646 /* Manage return value */
1647 if (ret != LTTNG_OK) {
1648 goto error;
1649 }
1650
1651 break;
1652 }
1653 case LTTNG_DOMAIN_JUL:
1654 {
1655 struct lttng_event uevent, event;
1656 struct lttng_domain tmp_dom;
1657 struct ltt_ust_session *usess = session->ust_session;
1658
1659 assert(usess);
1660
1661 /* Create the default JUL tracepoint. */
1662 uevent.type = LTTNG_EVENT_TRACEPOINT;
1663 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1664 if (is_root) {
1665 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1666 sizeof(uevent.name));
1667 } else {
1668 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1669 sizeof(uevent.name));
1670 }
1671 uevent.name[sizeof(uevent.name) - 1] = '\0';
1672
1673 /*
1674 * The domain type is changed because we are about to enable the
1675 * default channel and event for the JUL domain that are hardcoded.
1676 * This happens in the UST domain.
1677 */
1678 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1679 tmp_dom.type = LTTNG_DOMAIN_UST;
1680
1681 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1682 &uevent, NULL, NULL, NULL, wpipe);
1683 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1684 goto error;
1685 }
1686
1687 event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1688 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1689 strncpy(event.name, "*", sizeof(event.name));
1690 event.name[sizeof(event.name) - 1] = '\0';
1691
1692 ret = event_jul_enable_all(usess, &event, filter);
1693 if (ret != LTTNG_OK) {
1694 goto error;
1695 }
1696
1697 break;
1698 }
1699 #if 0
1700 case LTTNG_DOMAIN_UST_EXEC_NAME:
1701 case LTTNG_DOMAIN_UST_PID:
1702 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1703 #endif
1704 default:
1705 ret = LTTNG_ERR_UND;
1706 goto error;
1707 }
1708
1709 ret = LTTNG_OK;
1710
1711 error:
1712 rcu_read_unlock();
1713 return ret;
1714 }
1715
1716
1717 /*
1718 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1719 */
1720 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1721 {
1722 int ret;
1723 ssize_t nb_events = 0;
1724
1725 switch (domain) {
1726 case LTTNG_DOMAIN_KERNEL:
1727 nb_events = kernel_list_events(kernel_tracer_fd, events);
1728 if (nb_events < 0) {
1729 ret = LTTNG_ERR_KERN_LIST_FAIL;
1730 goto error;
1731 }
1732 break;
1733 case LTTNG_DOMAIN_UST:
1734 nb_events = ust_app_list_events(events);
1735 if (nb_events < 0) {
1736 ret = LTTNG_ERR_UST_LIST_FAIL;
1737 goto error;
1738 }
1739 break;
1740 case LTTNG_DOMAIN_JUL:
1741 nb_events = jul_list_events(events);
1742 if (nb_events < 0) {
1743 ret = LTTNG_ERR_UST_LIST_FAIL;
1744 goto error;
1745 }
1746 break;
1747 default:
1748 ret = LTTNG_ERR_UND;
1749 goto error;
1750 }
1751
1752 return nb_events;
1753
1754 error:
1755 /* Return negative value to differentiate return code */
1756 return -ret;
1757 }
1758
1759 /*
1760 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1761 */
1762 ssize_t cmd_list_tracepoint_fields(int domain,
1763 struct lttng_event_field **fields)
1764 {
1765 int ret;
1766 ssize_t nb_fields = 0;
1767
1768 switch (domain) {
1769 case LTTNG_DOMAIN_UST:
1770 nb_fields = ust_app_list_event_fields(fields);
1771 if (nb_fields < 0) {
1772 ret = LTTNG_ERR_UST_LIST_FAIL;
1773 goto error;
1774 }
1775 break;
1776 case LTTNG_DOMAIN_KERNEL:
1777 default: /* fall-through */
1778 ret = LTTNG_ERR_UND;
1779 goto error;
1780 }
1781
1782 return nb_fields;
1783
1784 error:
1785 /* Return negative value to differentiate return code */
1786 return -ret;
1787 }
1788
1789 /*
1790 * Command LTTNG_START_TRACE processed by the client thread.
1791 */
1792 int cmd_start_trace(struct ltt_session *session)
1793 {
1794 int ret;
1795 unsigned long nb_chan = 0;
1796 struct ltt_kernel_session *ksession;
1797 struct ltt_ust_session *usess;
1798
1799 assert(session);
1800
1801 /* Ease our life a bit ;) */
1802 ksession = session->kernel_session;
1803 usess = session->ust_session;
1804
1805 /* Is the session already started? */
1806 if (session->active) {
1807 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1808 goto error;
1809 }
1810
1811 /*
1812 * Starting a session without channel is useless since after that it's not
1813 * possible to enable channel thus inform the client.
1814 */
1815 if (usess && usess->domain_global.channels) {
1816 rcu_read_lock();
1817 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1818 rcu_read_unlock();
1819 }
1820 if (ksession) {
1821 nb_chan += ksession->channel_count;
1822 }
1823 if (!nb_chan) {
1824 ret = LTTNG_ERR_NO_CHANNEL;
1825 goto error;
1826 }
1827
1828 /* Kernel tracing */
1829 if (ksession != NULL) {
1830 ret = start_kernel_session(ksession, kernel_tracer_fd);
1831 if (ret != LTTNG_OK) {
1832 goto error;
1833 }
1834 }
1835
1836 /* Flag session that trace should start automatically */
1837 if (usess) {
1838 /*
1839 * Even though the start trace might fail, flag this session active so
1840 * other application coming in are started by default.
1841 */
1842 usess->active = 1;
1843
1844 ret = ust_app_start_trace_all(usess);
1845 if (ret < 0) {
1846 ret = LTTNG_ERR_UST_START_FAIL;
1847 goto error;
1848 }
1849 }
1850
1851 /* Flag this after a successful start. */
1852 session->has_been_started = 1;
1853 session->active = 1;
1854
1855 ret = LTTNG_OK;
1856
1857 error:
1858 return ret;
1859 }
1860
1861 /*
1862 * Command LTTNG_STOP_TRACE processed by the client thread.
1863 */
1864 int cmd_stop_trace(struct ltt_session *session)
1865 {
1866 int ret;
1867 struct ltt_kernel_channel *kchan;
1868 struct ltt_kernel_session *ksession;
1869 struct ltt_ust_session *usess;
1870
1871 assert(session);
1872
1873 /* Short cut */
1874 ksession = session->kernel_session;
1875 usess = session->ust_session;
1876
1877 /* Session is not active. Skip everythong and inform the client. */
1878 if (!session->active) {
1879 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1880 goto error;
1881 }
1882
1883 /* Kernel tracer */
1884 if (ksession && ksession->active) {
1885 DBG("Stop kernel tracing");
1886
1887 /* Flush metadata if exist */
1888 if (ksession->metadata_stream_fd >= 0) {
1889 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1890 if (ret < 0) {
1891 ERR("Kernel metadata flush failed");
1892 }
1893 }
1894
1895 /* Flush all buffers before stopping */
1896 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1897 ret = kernel_flush_buffer(kchan);
1898 if (ret < 0) {
1899 ERR("Kernel flush buffer error");
1900 }
1901 }
1902
1903 ret = kernel_stop_session(ksession);
1904 if (ret < 0) {
1905 ret = LTTNG_ERR_KERN_STOP_FAIL;
1906 goto error;
1907 }
1908
1909 kernel_wait_quiescent(kernel_tracer_fd);
1910
1911 ksession->active = 0;
1912 }
1913
1914 if (usess && usess->active) {
1915 /*
1916 * Even though the stop trace might fail, flag this session inactive so
1917 * other application coming in are not started by default.
1918 */
1919 usess->active = 0;
1920
1921 ret = ust_app_stop_trace_all(usess);
1922 if (ret < 0) {
1923 ret = LTTNG_ERR_UST_STOP_FAIL;
1924 goto error;
1925 }
1926 }
1927
1928 /* Flag inactive after a successful stop. */
1929 session->active = 0;
1930 ret = LTTNG_OK;
1931
1932 error:
1933 return ret;
1934 }
1935
1936 /*
1937 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1938 */
1939 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1940 size_t nb_uri, struct lttng_uri *uris)
1941 {
1942 int ret, i;
1943 struct ltt_kernel_session *ksess = session->kernel_session;
1944 struct ltt_ust_session *usess = session->ust_session;
1945 struct consumer_output *consumer = NULL;
1946
1947 assert(session);
1948 assert(uris);
1949 assert(nb_uri > 0);
1950
1951 /* Can't set consumer URI if the session is active. */
1952 if (session->active) {
1953 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1954 goto error;
1955 }
1956
1957 /*
1958 * This case switch makes sure the domain session has a temporary consumer
1959 * so the URL can be set.
1960 */
1961 switch (domain) {
1962 case 0:
1963 /* Code flow error. A session MUST always have a consumer object */
1964 assert(session->consumer);
1965 /*
1966 * The URL will be added to the tracing session consumer instead of a
1967 * specific domain consumer.
1968 */
1969 consumer = session->consumer;
1970 break;
1971 case LTTNG_DOMAIN_KERNEL:
1972 /* Code flow error if we don't have a kernel session here. */
1973 assert(ksess);
1974 assert(ksess->consumer);
1975 consumer = ksess->consumer;
1976 break;
1977 case LTTNG_DOMAIN_UST:
1978 /* Code flow error if we don't have a kernel session here. */
1979 assert(usess);
1980 assert(usess->consumer);
1981 consumer = usess->consumer;
1982 break;
1983 }
1984
1985 for (i = 0; i < nb_uri; i++) {
1986 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1987 if (ret != LTTNG_OK) {
1988 goto error;
1989 }
1990 }
1991
1992 /*
1993 * Make sure to set the session in output mode after we set URI since a
1994 * session can be created without URL (thus flagged in no output mode).
1995 */
1996 session->output_traces = 1;
1997 if (ksess) {
1998 ksess->output_traces = 1;
1999 } else if (usess) {
2000 usess->output_traces = 1;
2001 }
2002
2003 /* All good! */
2004 ret = LTTNG_OK;
2005
2006 error:
2007 return ret;
2008 }
2009
2010 /*
2011 * Command LTTNG_CREATE_SESSION processed by the client thread.
2012 */
2013 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2014 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2015 {
2016 int ret;
2017 struct ltt_session *session;
2018
2019 assert(name);
2020 assert(creds);
2021
2022 /*
2023 * Verify if the session already exist
2024 *
2025 * XXX: There is no need for the session lock list here since the caller
2026 * (process_client_msg) is holding it. We might want to change that so a
2027 * single command does not lock the entire session list.
2028 */
2029 session = session_find_by_name(name);
2030 if (session != NULL) {
2031 ret = LTTNG_ERR_EXIST_SESS;
2032 goto find_error;
2033 }
2034
2035 /* Create tracing session in the registry */
2036 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2037 LTTNG_SOCK_GET_GID_CRED(creds));
2038 if (ret != LTTNG_OK) {
2039 goto session_error;
2040 }
2041
2042 /*
2043 * Get the newly created session pointer back
2044 *
2045 * XXX: There is no need for the session lock list here since the caller
2046 * (process_client_msg) is holding it. We might want to change that so a
2047 * single command does not lock the entire session list.
2048 */
2049 session = session_find_by_name(name);
2050 assert(session);
2051
2052 session->live_timer = live_timer;
2053 /* Create default consumer output for the session not yet created. */
2054 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2055 if (session->consumer == NULL) {
2056 ret = LTTNG_ERR_FATAL;
2057 goto consumer_error;
2058 }
2059
2060 if (uris) {
2061 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2062 if (ret != LTTNG_OK) {
2063 goto consumer_error;
2064 }
2065 session->output_traces = 1;
2066 } else {
2067 session->output_traces = 0;
2068 DBG2("Session %s created with no output", session->name);
2069 }
2070
2071 session->consumer->enabled = 1;
2072
2073 return LTTNG_OK;
2074
2075 consumer_error:
2076 session_destroy(session);
2077 session_error:
2078 find_error:
2079 return ret;
2080 }
2081
2082 /*
2083 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2084 */
2085 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2086 size_t nb_uri, lttng_sock_cred *creds)
2087 {
2088 int ret;
2089 struct ltt_session *session;
2090 struct snapshot_output *new_output = NULL;
2091
2092 assert(name);
2093 assert(creds);
2094
2095 /*
2096 * Create session in no output mode with URIs set to NULL. The uris we've
2097 * received are for a default snapshot output if one.
2098 */
2099 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2100 if (ret != LTTNG_OK) {
2101 goto error;
2102 }
2103
2104 /* Get the newly created session pointer back. This should NEVER fail. */
2105 session = session_find_by_name(name);
2106 assert(session);
2107
2108 /* Flag session for snapshot mode. */
2109 session->snapshot_mode = 1;
2110
2111 /* Skip snapshot output creation if no URI is given. */
2112 if (nb_uri == 0) {
2113 goto end;
2114 }
2115
2116 new_output = snapshot_output_alloc();
2117 if (!new_output) {
2118 ret = LTTNG_ERR_NOMEM;
2119 goto error_snapshot_alloc;
2120 }
2121
2122 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2123 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2124 if (ret < 0) {
2125 if (ret == -ENOMEM) {
2126 ret = LTTNG_ERR_NOMEM;
2127 } else {
2128 ret = LTTNG_ERR_INVALID;
2129 }
2130 goto error_snapshot;
2131 }
2132
2133 rcu_read_lock();
2134 snapshot_add_output(&session->snapshot, new_output);
2135 rcu_read_unlock();
2136
2137 end:
2138 return LTTNG_OK;
2139
2140 error_snapshot:
2141 snapshot_output_destroy(new_output);
2142 error_snapshot_alloc:
2143 session_destroy(session);
2144 error:
2145 return ret;
2146 }
2147
2148 /*
2149 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2150 */
2151 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2152 {
2153 int ret;
2154 struct ltt_ust_session *usess;
2155 struct ltt_kernel_session *ksess;
2156
2157 /* Safety net */
2158 assert(session);
2159
2160 usess = session->ust_session;
2161 ksess = session->kernel_session;
2162
2163 /* Clean kernel session teardown */
2164 kernel_destroy_session(ksess);
2165
2166 /* UST session teardown */
2167 if (usess) {
2168 /* Close any relayd session */
2169 consumer_output_send_destroy_relayd(usess->consumer);
2170
2171 /* Destroy every UST application related to this session. */
2172 ret = ust_app_destroy_trace_all(usess);
2173 if (ret) {
2174 ERR("Error in ust_app_destroy_trace_all");
2175 }
2176
2177 /* Clean up the rest. */
2178 trace_ust_destroy_session(usess);
2179 }
2180
2181 /*
2182 * Must notify the kernel thread here to update it's poll set in order to
2183 * remove the channel(s)' fd just destroyed.
2184 */
2185 ret = notify_thread_pipe(wpipe);
2186 if (ret < 0) {
2187 PERROR("write kernel poll pipe");
2188 }
2189
2190 ret = session_destroy(session);
2191
2192 return ret;
2193 }
2194
2195 /*
2196 * Command LTTNG_CALIBRATE processed by the client thread.
2197 */
2198 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2199 {
2200 int ret;
2201
2202 switch (domain) {
2203 case LTTNG_DOMAIN_KERNEL:
2204 {
2205 struct lttng_kernel_calibrate kcalibrate;
2206
2207 switch (calibrate->type) {
2208 case LTTNG_CALIBRATE_FUNCTION:
2209 default:
2210 /* Default and only possible calibrate option. */
2211 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2212 break;
2213 }
2214
2215 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2216 if (ret < 0) {
2217 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2218 goto error;
2219 }
2220 break;
2221 }
2222 case LTTNG_DOMAIN_UST:
2223 {
2224 struct lttng_ust_calibrate ucalibrate;
2225
2226 switch (calibrate->type) {
2227 case LTTNG_CALIBRATE_FUNCTION:
2228 default:
2229 /* Default and only possible calibrate option. */
2230 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2231 break;
2232 }
2233
2234 ret = ust_app_calibrate_glb(&ucalibrate);
2235 if (ret < 0) {
2236 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2237 goto error;
2238 }
2239 break;
2240 }
2241 default:
2242 ret = LTTNG_ERR_UND;
2243 goto error;
2244 }
2245
2246 ret = LTTNG_OK;
2247
2248 error:
2249 return ret;
2250 }
2251
2252 /*
2253 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2254 */
2255 int cmd_register_consumer(struct ltt_session *session, int domain,
2256 const char *sock_path, struct consumer_data *cdata)
2257 {
2258 int ret, sock;
2259 struct consumer_socket *socket = NULL;
2260
2261 assert(session);
2262 assert(cdata);
2263 assert(sock_path);
2264
2265 switch (domain) {
2266 case LTTNG_DOMAIN_KERNEL:
2267 {
2268 struct ltt_kernel_session *ksess = session->kernel_session;
2269
2270 assert(ksess);
2271
2272 /* Can't register a consumer if there is already one */
2273 if (ksess->consumer_fds_sent != 0) {
2274 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2275 goto error;
2276 }
2277
2278 sock = lttcomm_connect_unix_sock(sock_path);
2279 if (sock < 0) {
2280 ret = LTTNG_ERR_CONNECT_FAIL;
2281 goto error;
2282 }
2283 cdata->cmd_sock = sock;
2284
2285 socket = consumer_allocate_socket(&cdata->cmd_sock);
2286 if (socket == NULL) {
2287 ret = close(sock);
2288 if (ret < 0) {
2289 PERROR("close register consumer");
2290 }
2291 cdata->cmd_sock = -1;
2292 ret = LTTNG_ERR_FATAL;
2293 goto error;
2294 }
2295
2296 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2297 if (socket->lock == NULL) {
2298 PERROR("zmalloc pthread mutex");
2299 ret = LTTNG_ERR_FATAL;
2300 goto error;
2301 }
2302 pthread_mutex_init(socket->lock, NULL);
2303 socket->registered = 1;
2304
2305 rcu_read_lock();
2306 consumer_add_socket(socket, ksess->consumer);
2307 rcu_read_unlock();
2308
2309 pthread_mutex_lock(&cdata->pid_mutex);
2310 cdata->pid = -1;
2311 pthread_mutex_unlock(&cdata->pid_mutex);
2312
2313 break;
2314 }
2315 default:
2316 /* TODO: Userspace tracing */
2317 ret = LTTNG_ERR_UND;
2318 goto error;
2319 }
2320
2321 return LTTNG_OK;
2322
2323 error:
2324 if (socket) {
2325 consumer_destroy_socket(socket);
2326 }
2327 return ret;
2328 }
2329
2330 /*
2331 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2332 */
2333 ssize_t cmd_list_domains(struct ltt_session *session,
2334 struct lttng_domain **domains)
2335 {
2336 int ret, index = 0;
2337 ssize_t nb_dom = 0;
2338
2339 if (session->kernel_session != NULL) {
2340 DBG3("Listing domains found kernel domain");
2341 nb_dom++;
2342 }
2343
2344 if (session->ust_session != NULL) {
2345 DBG3("Listing domains found UST global domain");
2346 nb_dom++;
2347
2348 if (session->ust_session->domain_jul.being_used) {
2349 nb_dom++;
2350 }
2351 }
2352
2353 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2354 if (*domains == NULL) {
2355 ret = LTTNG_ERR_FATAL;
2356 goto error;
2357 }
2358
2359 if (session->kernel_session != NULL) {
2360 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2361 index++;
2362 }
2363
2364 if (session->ust_session != NULL) {
2365 (*domains)[index].type = LTTNG_DOMAIN_UST;
2366 (*domains)[index].buf_type = session->ust_session->buffer_type;
2367 index++;
2368
2369 if (session->ust_session->domain_jul.being_used) {
2370 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2371 (*domains)[index].buf_type = session->ust_session->buffer_type;
2372 index++;
2373 }
2374 }
2375
2376 return nb_dom;
2377
2378 error:
2379 /* Return negative value to differentiate return code */
2380 return -ret;
2381 }
2382
2383
2384 /*
2385 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2386 */
2387 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2388 struct lttng_channel **channels)
2389 {
2390 int ret;
2391 ssize_t nb_chan = 0;
2392
2393 switch (domain) {
2394 case LTTNG_DOMAIN_KERNEL:
2395 if (session->kernel_session != NULL) {
2396 nb_chan = session->kernel_session->channel_count;
2397 }
2398 DBG3("Number of kernel channels %zd", nb_chan);
2399 if (nb_chan <= 0) {
2400 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2401 }
2402 break;
2403 case LTTNG_DOMAIN_UST:
2404 if (session->ust_session != NULL) {
2405 nb_chan = lttng_ht_get_count(
2406 session->ust_session->domain_global.channels);
2407 }
2408 DBG3("Number of UST global channels %zd", nb_chan);
2409 if (nb_chan < 0) {
2410 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2411 goto error;
2412 }
2413 break;
2414 default:
2415 ret = LTTNG_ERR_UND;
2416 goto error;
2417 }
2418
2419 if (nb_chan > 0) {
2420 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2421 if (*channels == NULL) {
2422 ret = LTTNG_ERR_FATAL;
2423 goto error;
2424 }
2425
2426 list_lttng_channels(domain, session, *channels);
2427 }
2428
2429 return nb_chan;
2430
2431 error:
2432 /* Return negative value to differentiate return code */
2433 return -ret;
2434 }
2435
2436 /*
2437 * Command LTTNG_LIST_EVENTS processed by the client thread.
2438 */
2439 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2440 char *channel_name, struct lttng_event **events)
2441 {
2442 int ret = 0;
2443 ssize_t nb_event = 0;
2444
2445 switch (domain) {
2446 case LTTNG_DOMAIN_KERNEL:
2447 if (session->kernel_session != NULL) {
2448 nb_event = list_lttng_kernel_events(channel_name,
2449 session->kernel_session, events);
2450 }
2451 break;
2452 case LTTNG_DOMAIN_UST:
2453 {
2454 if (session->ust_session != NULL) {
2455 nb_event = list_lttng_ust_global_events(channel_name,
2456 &session->ust_session->domain_global, events);
2457 }
2458 break;
2459 }
2460 case LTTNG_DOMAIN_JUL:
2461 if (session->ust_session) {
2462 nb_event = list_lttng_jul_events(
2463 &session->ust_session->domain_jul, events);
2464 }
2465 break;
2466 default:
2467 ret = LTTNG_ERR_UND;
2468 goto error;
2469 }
2470
2471 return nb_event;
2472
2473 error:
2474 /* Return negative value to differentiate return code */
2475 return -ret;
2476 }
2477
2478 /*
2479 * Using the session list, filled a lttng_session array to send back to the
2480 * client for session listing.
2481 *
2482 * The session list lock MUST be acquired before calling this function. Use
2483 * session_lock_list() and session_unlock_list().
2484 */
2485 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2486 gid_t gid)
2487 {
2488 int ret;
2489 unsigned int i = 0;
2490 struct ltt_session *session;
2491 struct ltt_session_list *list = session_get_list();
2492
2493 DBG("Getting all available session for UID %d GID %d",
2494 uid, gid);
2495 /*
2496 * Iterate over session list and append data after the control struct in
2497 * the buffer.
2498 */
2499 cds_list_for_each_entry(session, &list->head, list) {
2500 /*
2501 * Only list the sessions the user can control.
2502 */
2503 if (!session_access_ok(session, uid, gid)) {
2504 continue;
2505 }
2506
2507 struct ltt_kernel_session *ksess = session->kernel_session;
2508 struct ltt_ust_session *usess = session->ust_session;
2509
2510 if (session->consumer->type == CONSUMER_DST_NET ||
2511 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2512 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2513 ret = build_network_session_path(sessions[i].path,
2514 sizeof(sessions[i].path), session);
2515 } else {
2516 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2517 session->consumer->dst.trace_path);
2518 }
2519 if (ret < 0) {
2520 PERROR("snprintf session path");
2521 continue;
2522 }
2523
2524 strncpy(sessions[i].name, session->name, NAME_MAX);
2525 sessions[i].name[NAME_MAX - 1] = '\0';
2526 sessions[i].enabled = session->active;
2527 sessions[i].snapshot_mode = session->snapshot_mode;
2528 sessions[i].live_timer_interval = session->live_timer;
2529 i++;
2530 }
2531 }
2532
2533 /*
2534 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2535 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2536 */
2537 int cmd_data_pending(struct ltt_session *session)
2538 {
2539 int ret;
2540 struct ltt_kernel_session *ksess = session->kernel_session;
2541 struct ltt_ust_session *usess = session->ust_session;
2542
2543 assert(session);
2544
2545 /* Session MUST be stopped to ask for data availability. */
2546 if (session->active) {
2547 ret = LTTNG_ERR_SESSION_STARTED;
2548 goto error;
2549 } else {
2550 /*
2551 * If stopped, just make sure we've started before else the above call
2552 * will always send that there is data pending.
2553 *
2554 * The consumer assumes that when the data pending command is received,
2555 * the trace has been started before or else no output data is written
2556 * by the streams which is a condition for data pending. So, this is
2557 * *VERY* important that we don't ask the consumer before a start
2558 * trace.
2559 */
2560 if (!session->has_been_started) {
2561 ret = 0;
2562 goto error;
2563 }
2564 }
2565
2566 if (ksess && ksess->consumer) {
2567 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2568 if (ret == 1) {
2569 /* Data is still being extracted for the kernel. */
2570 goto error;
2571 }
2572 }
2573
2574 if (usess && usess->consumer) {
2575 ret = consumer_is_data_pending(usess->id, usess->consumer);
2576 if (ret == 1) {
2577 /* Data is still being extracted for the kernel. */
2578 goto error;
2579 }
2580 }
2581
2582 /* Data is ready to be read by a viewer */
2583 ret = 0;
2584
2585 error:
2586 return ret;
2587 }
2588
2589 /*
2590 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2591 *
2592 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2593 */
2594 int cmd_snapshot_add_output(struct ltt_session *session,
2595 struct lttng_snapshot_output *output, uint32_t *id)
2596 {
2597 int ret;
2598 struct snapshot_output *new_output;
2599
2600 assert(session);
2601 assert(output);
2602
2603 DBG("Cmd snapshot add output for session %s", session->name);
2604
2605 /*
2606 * Permission denied to create an output if the session is not
2607 * set in no output mode.
2608 */
2609 if (session->output_traces) {
2610 ret = LTTNG_ERR_EPERM;
2611 goto error;
2612 }
2613
2614 /* Only one output is allowed until we have the "tee" feature. */
2615 if (session->snapshot.nb_output == 1) {
2616 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2617 goto error;
2618 }
2619
2620 new_output = snapshot_output_alloc();
2621 if (!new_output) {
2622 ret = LTTNG_ERR_NOMEM;
2623 goto error;
2624 }
2625
2626 ret = snapshot_output_init(output->max_size, output->name,
2627 output->ctrl_url, output->data_url, session->consumer, new_output,
2628 &session->snapshot);
2629 if (ret < 0) {
2630 if (ret == -ENOMEM) {
2631 ret = LTTNG_ERR_NOMEM;
2632 } else {
2633 ret = LTTNG_ERR_INVALID;
2634 }
2635 goto free_error;
2636 }
2637
2638 rcu_read_lock();
2639 snapshot_add_output(&session->snapshot, new_output);
2640 if (id) {
2641 *id = new_output->id;
2642 }
2643 rcu_read_unlock();
2644
2645 return LTTNG_OK;
2646
2647 free_error:
2648 snapshot_output_destroy(new_output);
2649 error:
2650 return ret;
2651 }
2652
2653 /*
2654 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2655 *
2656 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2657 */
2658 int cmd_snapshot_del_output(struct ltt_session *session,
2659 struct lttng_snapshot_output *output)
2660 {
2661 int ret;
2662 struct snapshot_output *sout = NULL;
2663
2664 assert(session);
2665 assert(output);
2666
2667 rcu_read_lock();
2668
2669 /*
2670 * Permission denied to create an output if the session is not
2671 * set in no output mode.
2672 */
2673 if (session->output_traces) {
2674 ret = LTTNG_ERR_EPERM;
2675 goto error;
2676 }
2677
2678 if (output->id) {
2679 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2680 session->name);
2681 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2682 } else if (*output->name != '\0') {
2683 DBG("Cmd snapshot del output name %s for session %s", output->name,
2684 session->name);
2685 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2686 }
2687 if (!sout) {
2688 ret = LTTNG_ERR_INVALID;
2689 goto error;
2690 }
2691
2692 snapshot_delete_output(&session->snapshot, sout);
2693 snapshot_output_destroy(sout);
2694 ret = LTTNG_OK;
2695
2696 error:
2697 rcu_read_unlock();
2698 return ret;
2699 }
2700
2701 /*
2702 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2703 *
2704 * If no output is available, outputs is untouched and 0 is returned.
2705 *
2706 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2707 */
2708 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2709 struct lttng_snapshot_output **outputs)
2710 {
2711 int ret, idx = 0;
2712 struct lttng_snapshot_output *list;
2713 struct lttng_ht_iter iter;
2714 struct snapshot_output *output;
2715
2716 assert(session);
2717 assert(outputs);
2718
2719 DBG("Cmd snapshot list outputs for session %s", session->name);
2720
2721 /*
2722 * Permission denied to create an output if the session is not
2723 * set in no output mode.
2724 */
2725 if (session->output_traces) {
2726 ret = LTTNG_ERR_EPERM;
2727 goto error;
2728 }
2729
2730 if (session->snapshot.nb_output == 0) {
2731 ret = 0;
2732 goto error;
2733 }
2734
2735 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2736 if (!list) {
2737 ret = LTTNG_ERR_NOMEM;
2738 goto error;
2739 }
2740
2741 /* Copy list from session to the new list object. */
2742 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2743 output, node.node) {
2744 assert(output->consumer);
2745 list[idx].id = output->id;
2746 list[idx].max_size = output->max_size;
2747 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2748 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2749 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2750 sizeof(list[idx].ctrl_url));
2751 } else {
2752 /* Control URI. */
2753 ret = uri_to_str_url(&output->consumer->dst.net.control,
2754 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2755 if (ret < 0) {
2756 ret = LTTNG_ERR_NOMEM;
2757 goto free_error;
2758 }
2759
2760 /* Data URI. */
2761 ret = uri_to_str_url(&output->consumer->dst.net.data,
2762 list[idx].data_url, sizeof(list[idx].data_url));
2763 if (ret < 0) {
2764 ret = LTTNG_ERR_NOMEM;
2765 goto free_error;
2766 }
2767 }
2768 idx++;
2769 }
2770
2771 *outputs = list;
2772 return session->snapshot.nb_output;
2773
2774 free_error:
2775 free(list);
2776 error:
2777 return -ret;
2778 }
2779
2780 /*
2781 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2782 * snapshot output is *not* set with a remote destination.
2783 *
2784 * Return 0 on success or a LTTNG_ERR code.
2785 */
2786 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2787 struct snapshot_output *snap_output, struct ltt_session *session)
2788 {
2789 int ret = LTTNG_OK;
2790 struct lttng_ht_iter iter;
2791 struct consumer_socket *socket;
2792
2793 assert(consumer);
2794 assert(snap_output);
2795 assert(session);
2796
2797 DBG2("Set relayd object from snapshot output");
2798
2799 /* Ignore if snapshot consumer output is not network. */
2800 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2801 goto error;
2802 }
2803
2804 /*
2805 * For each consumer socket, create and send the relayd object of the
2806 * snapshot output.
2807 */
2808 rcu_read_lock();
2809 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2810 socket, node.node) {
2811 ret = send_consumer_relayd_sockets(0, session->id,
2812 snap_output->consumer, socket,
2813 session->name, session->hostname,
2814 session->live_timer);
2815 if (ret != LTTNG_OK) {
2816 rcu_read_unlock();
2817 goto error;
2818 }
2819 }
2820 rcu_read_unlock();
2821
2822 error:
2823 return ret;
2824 }
2825
2826 /*
2827 * Record a kernel snapshot.
2828 *
2829 * Return LTTNG_OK on success or a LTTNG_ERR code.
2830 */
2831 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2832 struct snapshot_output *output, struct ltt_session *session,
2833 int wait, uint64_t max_stream_size)
2834 {
2835 int ret;
2836
2837 assert(ksess);
2838 assert(output);
2839 assert(session);
2840
2841 /* Get the datetime for the snapshot output directory. */
2842 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2843 sizeof(output->datetime));
2844 if (!ret) {
2845 ret = LTTNG_ERR_INVALID;
2846 goto error;
2847 }
2848
2849 /*
2850 * Copy kernel session sockets so we can communicate with the right
2851 * consumer for the snapshot record command.
2852 */
2853 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2854 if (ret < 0) {
2855 ret = LTTNG_ERR_NOMEM;
2856 goto error;
2857 }
2858
2859 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2860 if (ret != LTTNG_OK) {
2861 goto error_snapshot;
2862 }
2863
2864 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2865 if (ret != LTTNG_OK) {
2866 goto error_snapshot;
2867 }
2868
2869 ret = LTTNG_OK;
2870
2871 error_snapshot:
2872 /* Clean up copied sockets so this output can use some other later on. */
2873 consumer_destroy_output_sockets(output->consumer);
2874 error:
2875 return ret;
2876 }
2877
2878 /*
2879 * Record a UST snapshot.
2880 *
2881 * Return 0 on success or a LTTNG_ERR error code.
2882 */
2883 static int record_ust_snapshot(struct ltt_ust_session *usess,
2884 struct snapshot_output *output, struct ltt_session *session,
2885 int wait, uint64_t max_stream_size)
2886 {
2887 int ret;
2888
2889 assert(usess);
2890 assert(output);
2891 assert(session);
2892
2893 /* Get the datetime for the snapshot output directory. */
2894 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2895 sizeof(output->datetime));
2896 if (!ret) {
2897 ret = LTTNG_ERR_INVALID;
2898 goto error;
2899 }
2900
2901 /*
2902 * Copy UST session sockets so we can communicate with the right
2903 * consumer for the snapshot record command.
2904 */
2905 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2906 if (ret < 0) {
2907 ret = LTTNG_ERR_NOMEM;
2908 goto error;
2909 }
2910
2911 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2912 if (ret != LTTNG_OK) {
2913 goto error_snapshot;
2914 }
2915
2916 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
2917 if (ret < 0) {
2918 switch (-ret) {
2919 case EINVAL:
2920 ret = LTTNG_ERR_INVALID;
2921 break;
2922 case ENODATA:
2923 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2924 break;
2925 default:
2926 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2927 break;
2928 }
2929 goto error_snapshot;
2930 }
2931
2932 ret = LTTNG_OK;
2933
2934 error_snapshot:
2935 /* Clean up copied sockets so this output can use some other later on. */
2936 consumer_destroy_output_sockets(output->consumer);
2937 error:
2938 return ret;
2939 }
2940
2941 /*
2942 * Return the biggest subbuffer size of all channels in the given session.
2943 */
2944 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
2945 {
2946 uint64_t max_size = 0;
2947
2948 assert(session);
2949
2950 if (session->kernel_session) {
2951 struct ltt_kernel_channel *chan;
2952 struct ltt_kernel_session *ksess = session->kernel_session;
2953
2954 /*
2955 * For each channel, add to the max size the size of each subbuffer
2956 * multiplied by their sized.
2957 */
2958 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
2959 if (chan->channel->attr.subbuf_size > max_size) {
2960 max_size = chan->channel->attr.subbuf_size;
2961 }
2962 }
2963 }
2964
2965 if (session->ust_session) {
2966 struct lttng_ht_iter iter;
2967 struct ltt_ust_channel *uchan;
2968 struct ltt_ust_session *usess = session->ust_session;
2969
2970 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
2971 uchan, node.node) {
2972 if (uchan->attr.subbuf_size > max_size) {
2973 max_size = uchan->attr.subbuf_size;
2974 }
2975 }
2976 }
2977
2978 return max_size;
2979 }
2980
2981 /*
2982 * Returns the total number of streams for a session or a negative value
2983 * on error.
2984 */
2985 static unsigned int get_session_nb_streams(struct ltt_session *session)
2986 {
2987 unsigned int total_streams = 0;
2988
2989 if (session->kernel_session) {
2990 struct ltt_kernel_session *ksess = session->kernel_session;
2991
2992 total_streams += ksess->stream_count_global;
2993 }
2994
2995 if (session->ust_session) {
2996 struct ltt_ust_session *usess = session->ust_session;
2997
2998 total_streams += ust_app_get_nb_stream(usess);
2999 }
3000
3001 return total_streams;
3002 }
3003
3004 /*
3005 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3006 *
3007 * The wait parameter is ignored so this call always wait for the snapshot to
3008 * complete before returning.
3009 *
3010 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3011 */
3012 int cmd_snapshot_record(struct ltt_session *session,
3013 struct lttng_snapshot_output *output, int wait)
3014 {
3015 int ret = LTTNG_OK;
3016 unsigned int use_tmp_output = 0;
3017 struct snapshot_output tmp_output;
3018 unsigned int nb_streams, snapshot_success = 0;
3019 uint64_t session_max_size = 0, max_stream_size = 0;
3020
3021 assert(session);
3022
3023 DBG("Cmd snapshot record for session %s", session->name);
3024
3025 /*
3026 * Permission denied to create an output if the session is not
3027 * set in no output mode.
3028 */
3029 if (session->output_traces) {
3030 ret = LTTNG_ERR_EPERM;
3031 goto error;
3032 }
3033
3034 /* The session needs to be started at least once. */
3035 if (!session->has_been_started) {
3036 ret = LTTNG_ERR_START_SESSION_ONCE;
3037 goto error;
3038 }
3039
3040 /* Use temporary output for the session. */
3041 if (output && *output->ctrl_url != '\0') {
3042 ret = snapshot_output_init(output->max_size, output->name,
3043 output->ctrl_url, output->data_url, session->consumer,
3044 &tmp_output, NULL);
3045 if (ret < 0) {
3046 if (ret == -ENOMEM) {
3047 ret = LTTNG_ERR_NOMEM;
3048 } else {
3049 ret = LTTNG_ERR_INVALID;
3050 }
3051 goto error;
3052 }
3053 /* Use the global session count for the temporary snapshot. */
3054 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3055 use_tmp_output = 1;
3056 }
3057
3058 /*
3059 * Get the session maximum size for a snapshot meaning it will compute the
3060 * size of all streams from all domain.
3061 */
3062 max_stream_size = get_session_max_subbuf_size(session);
3063
3064 nb_streams = get_session_nb_streams(session);
3065 if (nb_streams) {
3066 /*
3067 * The maximum size of the snapshot is the number of streams multiplied
3068 * by the biggest subbuf size of all channels in a session which is the
3069 * maximum stream size available for each stream. The session max size
3070 * is now checked against the snapshot max size value given by the user
3071 * and if lower, an error is returned.
3072 */
3073 session_max_size = max_stream_size * nb_streams;
3074 }
3075
3076 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3077 session_max_size, max_stream_size);
3078
3079 /*
3080 * If we use a temporary output, check right away if the max size fits else
3081 * for each output the max size will be checked.
3082 */
3083 if (use_tmp_output &&
3084 (tmp_output.max_size != 0 &&
3085 tmp_output.max_size < session_max_size)) {
3086 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3087 goto error;
3088 }
3089
3090 if (session->kernel_session) {
3091 struct ltt_kernel_session *ksess = session->kernel_session;
3092
3093 if (use_tmp_output) {
3094 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3095 wait, max_stream_size);
3096 if (ret != LTTNG_OK) {
3097 goto error;
3098 }
3099 snapshot_success = 1;
3100 } else {
3101 struct snapshot_output *sout;
3102 struct lttng_ht_iter iter;
3103
3104 rcu_read_lock();
3105 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3106 &iter.iter, sout, node.node) {
3107 /*
3108 * Make a local copy of the output and assign the possible
3109 * temporary value given by the caller.
3110 */
3111 memset(&tmp_output, 0, sizeof(tmp_output));
3112 memcpy(&tmp_output, sout, sizeof(tmp_output));
3113
3114 /* Use temporary max size. */
3115 if (output->max_size != (uint64_t) -1ULL) {
3116 tmp_output.max_size = output->max_size;
3117 }
3118
3119 if (tmp_output.max_size != 0 &&
3120 tmp_output.max_size < session_max_size) {
3121 rcu_read_unlock();
3122 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3123 goto error;
3124 }
3125
3126 /* Use temporary name. */
3127 if (*output->name != '\0') {
3128 strncpy(tmp_output.name, output->name,
3129 sizeof(tmp_output.name));
3130 }
3131
3132 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3133
3134 ret = record_kernel_snapshot(ksess, &tmp_output,
3135 session, wait, max_stream_size);
3136 if (ret != LTTNG_OK) {
3137 rcu_read_unlock();
3138 goto error;
3139 }
3140 snapshot_success = 1;
3141 }
3142 rcu_read_unlock();
3143 }
3144 }
3145
3146 if (session->ust_session) {
3147 struct ltt_ust_session *usess = session->ust_session;
3148
3149 if (use_tmp_output) {
3150 ret = record_ust_snapshot(usess, &tmp_output, session,
3151 wait, max_stream_size);
3152 if (ret != LTTNG_OK) {
3153 goto error;
3154 }
3155 snapshot_success = 1;
3156 } else {
3157 struct snapshot_output *sout;
3158 struct lttng_ht_iter iter;
3159
3160 rcu_read_lock();
3161 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3162 &iter.iter, sout, node.node) {
3163 /*
3164 * Make a local copy of the output and assign the possible
3165 * temporary value given by the caller.
3166 */
3167 memset(&tmp_output, 0, sizeof(tmp_output));
3168 memcpy(&tmp_output, sout, sizeof(tmp_output));
3169
3170 /* Use temporary max size. */
3171 if (output->max_size != (uint64_t) -1ULL) {
3172 tmp_output.max_size = output->max_size;
3173 }
3174
3175 if (tmp_output.max_size != 0 &&
3176 tmp_output.max_size < session_max_size) {
3177 rcu_read_unlock();
3178 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3179 goto error;
3180 }
3181
3182 /* Use temporary name. */
3183 if (*output->name != '\0') {
3184 strncpy(tmp_output.name, output->name,
3185 sizeof(tmp_output.name));
3186 }
3187
3188 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3189
3190 ret = record_ust_snapshot(usess, &tmp_output, session,
3191 wait, max_stream_size);
3192 if (ret != LTTNG_OK) {
3193 rcu_read_unlock();
3194 goto error;
3195 }
3196 snapshot_success = 1;
3197 }
3198 rcu_read_unlock();
3199 }
3200 }
3201
3202 if (snapshot_success) {
3203 session->snapshot.nb_snapshot++;
3204 } else {
3205 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3206 }
3207
3208 error:
3209 return ret;
3210 }
3211
3212 /*
3213 * Init command subsystem.
3214 */
3215 void cmd_init(void)
3216 {
3217 /*
3218 * Set network sequence index to 1 for streams to match a relayd
3219 * socket on the consumer side.
3220 */
3221 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3222 relayd_net_seq_idx = 1;
3223 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3224
3225 DBG("Command subsystem initialized");
3226 }
LTTng 2.0 tools and control repository
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