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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 #include "syscall.h"
39
40 #include "cmd.h"
41
42 /*
43 * Used to keep a unique index for each relayd socket created where this value
44 * is associated with streams on the consumer so it can match the right relayd
45 * to send to. It must be accessed with the relayd_net_seq_idx_lock
46 * held.
47 */
48 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
49 static uint64_t relayd_net_seq_idx;
50
51 /*
52 * Both functions below are special case for the Kernel domain when
53 * enabling/disabling all events.
54 */
55 static
56 int enable_kevent_all(struct ltt_session *session,
57 struct lttng_domain *domain, char *channel_name,
58 struct lttng_event *event,
59 char *filter_expression,
60 struct lttng_filter_bytecode *filter, int wpipe);
61 static
62 int disable_kevent_all(struct ltt_session *session, int domain,
63 char *channel_name,
64 struct lttng_event *event);
65
66 /*
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
69 */
70 static int build_network_session_path(char *dst, size_t size,
71 struct ltt_session *session)
72 {
73 int ret, kdata_port, udata_port;
74 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
75 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
76
77 assert(session);
78 assert(dst);
79
80 memset(tmp_urls, 0, sizeof(tmp_urls));
81 memset(tmp_uurl, 0, sizeof(tmp_uurl));
82
83 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
84
85 if (session->kernel_session && session->kernel_session->consumer) {
86 kuri = &session->kernel_session->consumer->dst.net.control;
87 kdata_port = session->kernel_session->consumer->dst.net.data.port;
88 }
89
90 if (session->ust_session && session->ust_session->consumer) {
91 uuri = &session->ust_session->consumer->dst.net.control;
92 udata_port = session->ust_session->consumer->dst.net.data.port;
93 }
94
95 if (uuri == NULL && kuri == NULL) {
96 uri = &session->consumer->dst.net.control;
97 kdata_port = session->consumer->dst.net.data.port;
98 } else if (kuri && uuri) {
99 ret = uri_compare(kuri, uuri);
100 if (ret) {
101 /* Not Equal */
102 uri = kuri;
103 /* Build uuri URL string */
104 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
105 if (ret < 0) {
106 goto error;
107 }
108 } else {
109 uri = kuri;
110 }
111 } else if (kuri && uuri == NULL) {
112 uri = kuri;
113 } else if (uuri && kuri == NULL) {
114 uri = uuri;
115 }
116
117 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
118 if (ret < 0) {
119 goto error;
120 }
121
122 /*
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 * to print.
125 */
126 if (*tmp_uurl != '\0') {
127 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls, kdata_port, tmp_uurl, udata_port);
129 } else {
130 int dport;
131 if (kuri || (!kuri && !uuri)) {
132 dport = kdata_port;
133 } else {
134 /* No kernel URI, use the UST port. */
135 dport = udata_port;
136 }
137 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
138 }
139
140 error:
141 return ret;
142 }
143
144 /*
145 * Fill lttng_channel array of all channels.
146 */
147 static void list_lttng_channels(int domain, struct ltt_session *session,
148 struct lttng_channel *channels)
149 {
150 int i = 0;
151 struct ltt_kernel_channel *kchan;
152
153 DBG("Listing channels for session %s", session->name);
154
155 switch (domain) {
156 case LTTNG_DOMAIN_KERNEL:
157 /* Kernel channels */
158 if (session->kernel_session != NULL) {
159 cds_list_for_each_entry(kchan,
160 &session->kernel_session->channel_list.head, list) {
161 /* Copy lttng_channel struct to array */
162 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
163 channels[i].enabled = kchan->enabled;
164 i++;
165 }
166 }
167 break;
168 case LTTNG_DOMAIN_UST:
169 {
170 struct lttng_ht_iter iter;
171 struct ltt_ust_channel *uchan;
172
173 rcu_read_lock();
174 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
175 &iter.iter, uchan, node.node) {
176 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
177 channels[i].attr.overwrite = uchan->attr.overwrite;
178 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
179 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
180 channels[i].attr.switch_timer_interval =
181 uchan->attr.switch_timer_interval;
182 channels[i].attr.read_timer_interval =
183 uchan->attr.read_timer_interval;
184 channels[i].enabled = uchan->enabled;
185 channels[i].attr.tracefile_size = uchan->tracefile_size;
186 channels[i].attr.tracefile_count = uchan->tracefile_count;
187 switch (uchan->attr.output) {
188 case LTTNG_UST_MMAP:
189 default:
190 channels[i].attr.output = LTTNG_EVENT_MMAP;
191 break;
192 }
193 i++;
194 }
195 rcu_read_unlock();
196 break;
197 }
198 default:
199 break;
200 }
201 }
202
203 /*
204 * Create a list of agent domain events.
205 *
206 * Return number of events in list on success or else a negative value.
207 */
208 static int list_lttng_agent_events(struct agent *agt,
209 struct lttng_event **events)
210 {
211 int i = 0, ret = 0;
212 unsigned int nb_event = 0;
213 struct agent_event *event;
214 struct lttng_event *tmp_events;
215 struct lttng_ht_iter iter;
216
217 assert(agt);
218 assert(events);
219
220 DBG3("Listing agent events");
221
222 rcu_read_lock();
223 nb_event = lttng_ht_get_count(agt->events);
224 rcu_read_unlock();
225 if (nb_event == 0) {
226 ret = nb_event;
227 goto error;
228 }
229
230 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
231 if (!tmp_events) {
232 PERROR("zmalloc agent events session");
233 ret = -LTTNG_ERR_FATAL;
234 goto error;
235 }
236
237 rcu_read_lock();
238 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
239 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
240 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
241 tmp_events[i].enabled = event->enabled;
242 tmp_events[i].loglevel = event->loglevel;
243 tmp_events[i].loglevel_type = event->loglevel_type;
244 i++;
245 }
246 rcu_read_unlock();
247
248 *events = tmp_events;
249 ret = nb_event;
250
251 error:
252 assert(nb_event == i);
253 return ret;
254 }
255
256 /*
257 * Create a list of ust global domain events.
258 */
259 static int list_lttng_ust_global_events(char *channel_name,
260 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
261 {
262 int i = 0, ret = 0;
263 unsigned int nb_event = 0;
264 struct lttng_ht_iter iter;
265 struct lttng_ht_node_str *node;
266 struct ltt_ust_channel *uchan;
267 struct ltt_ust_event *uevent;
268 struct lttng_event *tmp;
269
270 DBG("Listing UST global events for channel %s", channel_name);
271
272 rcu_read_lock();
273
274 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
275 node = lttng_ht_iter_get_node_str(&iter);
276 if (node == NULL) {
277 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
278 goto error;
279 }
280
281 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
282
283 nb_event += lttng_ht_get_count(uchan->events);
284
285 if (nb_event == 0) {
286 ret = nb_event;
287 goto error;
288 }
289
290 DBG3("Listing UST global %d events", nb_event);
291
292 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
293 if (tmp == NULL) {
294 ret = LTTNG_ERR_FATAL;
295 goto error;
296 }
297
298 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
299 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
300 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
301 tmp[i].enabled = uevent->enabled;
302
303 switch (uevent->attr.instrumentation) {
304 case LTTNG_UST_TRACEPOINT:
305 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
306 break;
307 case LTTNG_UST_PROBE:
308 tmp[i].type = LTTNG_EVENT_PROBE;
309 break;
310 case LTTNG_UST_FUNCTION:
311 tmp[i].type = LTTNG_EVENT_FUNCTION;
312 break;
313 }
314
315 tmp[i].loglevel = uevent->attr.loglevel;
316 switch (uevent->attr.loglevel_type) {
317 case LTTNG_UST_LOGLEVEL_ALL:
318 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
319 break;
320 case LTTNG_UST_LOGLEVEL_RANGE:
321 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
322 break;
323 case LTTNG_UST_LOGLEVEL_SINGLE:
324 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
325 break;
326 }
327 if (uevent->filter) {
328 tmp[i].filter = 1;
329 }
330 if (uevent->exclusion) {
331 tmp[i].exclusion = 1;
332 }
333 i++;
334 }
335
336 ret = nb_event;
337 *events = tmp;
338
339 error:
340 rcu_read_unlock();
341 return ret;
342 }
343
344 /*
345 * Fill lttng_event array of all kernel events in the channel.
346 */
347 static int list_lttng_kernel_events(char *channel_name,
348 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
349 {
350 int i = 0, ret;
351 unsigned int nb_event;
352 struct ltt_kernel_event *event;
353 struct ltt_kernel_channel *kchan;
354
355 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
356 if (kchan == NULL) {
357 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
358 goto error;
359 }
360
361 nb_event = kchan->event_count;
362
363 DBG("Listing events for channel %s", kchan->channel->name);
364
365 if (nb_event == 0) {
366 *events = NULL;
367 goto syscall;
368 }
369
370 *events = zmalloc(nb_event * sizeof(struct lttng_event));
371 if (*events == NULL) {
372 ret = LTTNG_ERR_FATAL;
373 goto error;
374 }
375
376 /* Kernel channels */
377 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
378 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
379 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
380 (*events)[i].enabled = event->enabled;
381
382 switch (event->event->instrumentation) {
383 case LTTNG_KERNEL_TRACEPOINT:
384 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
385 break;
386 case LTTNG_KERNEL_KRETPROBE:
387 (*events)[i].type = LTTNG_EVENT_FUNCTION;
388 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
389 sizeof(struct lttng_kernel_kprobe));
390 break;
391 case LTTNG_KERNEL_KPROBE:
392 (*events)[i].type = LTTNG_EVENT_PROBE;
393 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
394 sizeof(struct lttng_kernel_kprobe));
395 break;
396 case LTTNG_KERNEL_FUNCTION:
397 (*events)[i].type = LTTNG_EVENT_FUNCTION;
398 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
399 sizeof(struct lttng_kernel_function));
400 break;
401 case LTTNG_KERNEL_NOOP:
402 (*events)[i].type = LTTNG_EVENT_NOOP;
403 break;
404 case LTTNG_KERNEL_SYSCALL:
405 (*events)[i].type = LTTNG_EVENT_SYSCALL;
406 break;
407 case LTTNG_KERNEL_ALL:
408 assert(0);
409 break;
410 }
411 i++;
412 }
413
414 syscall:
415 if (syscall_table) {
416 ssize_t new_size;
417
418 new_size = syscall_list_channel(kchan, events, nb_event);
419 if (new_size < 0) {
420 free(events);
421 ret = -new_size;
422 goto error;
423 }
424 nb_event = new_size;
425 }
426
427 return nb_event;
428
429 error:
430 /* Negate the error code to differentiate the size from an error */
431 return -ret;
432 }
433
434 /*
435 * Add URI so the consumer output object. Set the correct path depending on the
436 * domain adding the default trace directory.
437 */
438 static int add_uri_to_consumer(struct consumer_output *consumer,
439 struct lttng_uri *uri, int domain, const char *session_name)
440 {
441 int ret = LTTNG_OK;
442 const char *default_trace_dir;
443
444 assert(uri);
445
446 if (consumer == NULL) {
447 DBG("No consumer detected. Don't add URI. Stopping.");
448 ret = LTTNG_ERR_NO_CONSUMER;
449 goto error;
450 }
451
452 switch (domain) {
453 case LTTNG_DOMAIN_KERNEL:
454 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
455 break;
456 case LTTNG_DOMAIN_UST:
457 default_trace_dir = DEFAULT_UST_TRACE_DIR;
458 break;
459 default:
460 /*
461 * This case is possible is we try to add the URI to the global tracing
462 * session consumer object which in this case there is no subdir.
463 */
464 default_trace_dir = "";
465 }
466
467 switch (uri->dtype) {
468 case LTTNG_DST_IPV4:
469 case LTTNG_DST_IPV6:
470 DBG2("Setting network URI to consumer");
471
472 if (consumer->type == CONSUMER_DST_NET) {
473 if ((uri->stype == LTTNG_STREAM_CONTROL &&
474 consumer->dst.net.control_isset) ||
475 (uri->stype == LTTNG_STREAM_DATA &&
476 consumer->dst.net.data_isset)) {
477 ret = LTTNG_ERR_URL_EXIST;
478 goto error;
479 }
480 } else {
481 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
482 }
483
484 consumer->type = CONSUMER_DST_NET;
485
486 /* Set URI into consumer output object */
487 ret = consumer_set_network_uri(consumer, uri);
488 if (ret < 0) {
489 ret = -ret;
490 goto error;
491 } else if (ret == 1) {
492 /*
493 * URI was the same in the consumer so we do not append the subdir
494 * again so to not duplicate output dir.
495 */
496 ret = LTTNG_OK;
497 goto error;
498 }
499
500 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
501 ret = consumer_set_subdir(consumer, session_name);
502 if (ret < 0) {
503 ret = LTTNG_ERR_FATAL;
504 goto error;
505 }
506 }
507
508 if (uri->stype == LTTNG_STREAM_CONTROL) {
509 /* On a new subdir, reappend the default trace dir. */
510 strncat(consumer->subdir, default_trace_dir,
511 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
512 DBG3("Append domain trace name to subdir %s", consumer->subdir);
513 }
514
515 break;
516 case LTTNG_DST_PATH:
517 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
518 memset(consumer->dst.trace_path, 0,
519 sizeof(consumer->dst.trace_path));
520 strncpy(consumer->dst.trace_path, uri->dst.path,
521 sizeof(consumer->dst.trace_path));
522 /* Append default trace dir */
523 strncat(consumer->dst.trace_path, default_trace_dir,
524 sizeof(consumer->dst.trace_path) -
525 strlen(consumer->dst.trace_path) - 1);
526 /* Flag consumer as local. */
527 consumer->type = CONSUMER_DST_LOCAL;
528 break;
529 }
530
531 ret = LTTNG_OK;
532
533 error:
534 return ret;
535 }
536
537 /*
538 * Init tracing by creating trace directory and sending fds kernel consumer.
539 */
540 static int init_kernel_tracing(struct ltt_kernel_session *session)
541 {
542 int ret = 0;
543 struct lttng_ht_iter iter;
544 struct consumer_socket *socket;
545
546 assert(session);
547
548 rcu_read_lock();
549
550 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
551 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
552 socket, node.node) {
553 pthread_mutex_lock(socket->lock);
554 ret = kernel_consumer_send_session(socket, session);
555 pthread_mutex_unlock(socket->lock);
556 if (ret < 0) {
557 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
558 goto error;
559 }
560 }
561 }
562
563 error:
564 rcu_read_unlock();
565 return ret;
566 }
567
568 /*
569 * Create a socket to the relayd using the URI.
570 *
571 * On success, the relayd_sock pointer is set to the created socket.
572 * Else, it's stays untouched and a lttcomm error code is returned.
573 */
574 static int create_connect_relayd(struct lttng_uri *uri,
575 struct lttcomm_relayd_sock **relayd_sock)
576 {
577 int ret;
578 struct lttcomm_relayd_sock *rsock;
579
580 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
581 RELAYD_VERSION_COMM_MINOR);
582 if (!rsock) {
583 ret = LTTNG_ERR_FATAL;
584 goto error;
585 }
586
587 /*
588 * Connect to relayd so we can proceed with a session creation. This call
589 * can possibly block for an arbitrary amount of time to set the health
590 * state to be in poll execution.
591 */
592 health_poll_entry();
593 ret = relayd_connect(rsock);
594 health_poll_exit();
595 if (ret < 0) {
596 ERR("Unable to reach lttng-relayd");
597 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
598 goto free_sock;
599 }
600
601 /* Create socket for control stream. */
602 if (uri->stype == LTTNG_STREAM_CONTROL) {
603 DBG3("Creating relayd stream socket from URI");
604
605 /* Check relayd version */
606 ret = relayd_version_check(rsock);
607 if (ret < 0) {
608 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
609 goto close_sock;
610 }
611 } else if (uri->stype == LTTNG_STREAM_DATA) {
612 DBG3("Creating relayd data socket from URI");
613 } else {
614 /* Command is not valid */
615 ERR("Relayd invalid stream type: %d", uri->stype);
616 ret = LTTNG_ERR_INVALID;
617 goto close_sock;
618 }
619
620 *relayd_sock = rsock;
621
622 return LTTNG_OK;
623
624 close_sock:
625 /* The returned value is not useful since we are on an error path. */
626 (void) relayd_close(rsock);
627 free_sock:
628 free(rsock);
629 error:
630 return ret;
631 }
632
633 /*
634 * Connect to the relayd using URI and send the socket to the right consumer.
635 */
636 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
637 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
638 struct consumer_socket *consumer_sock,
639 char *session_name, char *hostname, int session_live_timer)
640 {
641 int ret;
642 struct lttcomm_relayd_sock *rsock = NULL;
643
644 /* Connect to relayd and make version check if uri is the control. */
645 ret = create_connect_relayd(relayd_uri, &rsock);
646 if (ret != LTTNG_OK) {
647 goto error;
648 }
649 assert(rsock);
650
651 /* Set the network sequence index if not set. */
652 if (consumer->net_seq_index == (uint64_t) -1ULL) {
653 pthread_mutex_lock(&relayd_net_seq_idx_lock);
654 /*
655 * Increment net_seq_idx because we are about to transfer the
656 * new relayd socket to the consumer.
657 * Assign unique key so the consumer can match streams.
658 */
659 consumer->net_seq_index = ++relayd_net_seq_idx;
660 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
661 }
662
663 /* Send relayd socket to consumer. */
664 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
665 relayd_uri->stype, session_id,
666 session_name, hostname, session_live_timer);
667 if (ret < 0) {
668 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
669 goto close_sock;
670 }
671
672 /* Flag that the corresponding socket was sent. */
673 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
674 consumer_sock->control_sock_sent = 1;
675 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
676 consumer_sock->data_sock_sent = 1;
677 }
678
679 ret = LTTNG_OK;
680
681 /*
682 * Close socket which was dup on the consumer side. The session daemon does
683 * NOT keep track of the relayd socket(s) once transfer to the consumer.
684 */
685
686 close_sock:
687 (void) relayd_close(rsock);
688 free(rsock);
689
690 error:
691 if (ret != LTTNG_OK) {
692 /*
693 * The consumer output for this session should not be used anymore
694 * since the relayd connection failed thus making any tracing or/and
695 * streaming not usable.
696 */
697 consumer->enabled = 0;
698 }
699 return ret;
700 }
701
702 /*
703 * Send both relayd sockets to a specific consumer and domain. This is a
704 * helper function to facilitate sending the information to the consumer for a
705 * session.
706 */
707 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
708 struct consumer_output *consumer, struct consumer_socket *sock,
709 char *session_name, char *hostname, int session_live_timer)
710 {
711 int ret = LTTNG_OK;
712
713 assert(consumer);
714 assert(sock);
715
716 /* Sending control relayd socket. */
717 if (!sock->control_sock_sent) {
718 ret = send_consumer_relayd_socket(domain, session_id,
719 &consumer->dst.net.control, consumer, sock,
720 session_name, hostname, session_live_timer);
721 if (ret != LTTNG_OK) {
722 goto error;
723 }
724 }
725
726 /* Sending data relayd socket. */
727 if (!sock->data_sock_sent) {
728 ret = send_consumer_relayd_socket(domain, session_id,
729 &consumer->dst.net.data, consumer, sock,
730 session_name, hostname, session_live_timer);
731 if (ret != LTTNG_OK) {
732 goto error;
733 }
734 }
735
736 error:
737 return ret;
738 }
739
740 /*
741 * Setup relayd connections for a tracing session. First creates the socket to
742 * the relayd and send them to the right domain consumer. Consumer type MUST be
743 * network.
744 */
745 int cmd_setup_relayd(struct ltt_session *session)
746 {
747 int ret = LTTNG_OK;
748 struct ltt_ust_session *usess;
749 struct ltt_kernel_session *ksess;
750 struct consumer_socket *socket;
751 struct lttng_ht_iter iter;
752
753 assert(session);
754
755 usess = session->ust_session;
756 ksess = session->kernel_session;
757
758 DBG("Setting relayd for session %s", session->name);
759
760 rcu_read_lock();
761
762 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
763 && usess->consumer->enabled) {
764 /* For each consumer socket, send relayd sockets */
765 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
766 socket, node.node) {
767 pthread_mutex_lock(socket->lock);
768 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
769 usess->consumer, socket,
770 session->name, session->hostname,
771 session->live_timer);
772 pthread_mutex_unlock(socket->lock);
773 if (ret != LTTNG_OK) {
774 goto error;
775 }
776 /* Session is now ready for network streaming. */
777 session->net_handle = 1;
778 }
779 }
780
781 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
782 && ksess->consumer->enabled) {
783 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
784 socket, node.node) {
785 pthread_mutex_lock(socket->lock);
786 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
787 ksess->consumer, socket,
788 session->name, session->hostname,
789 session->live_timer);
790 pthread_mutex_unlock(socket->lock);
791 if (ret != LTTNG_OK) {
792 goto error;
793 }
794 /* Session is now ready for network streaming. */
795 session->net_handle = 1;
796 }
797 }
798
799 error:
800 rcu_read_unlock();
801 return ret;
802 }
803
804 /*
805 * Start a kernel session by opening all necessary streams.
806 */
807 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
808 {
809 int ret;
810 struct ltt_kernel_channel *kchan;
811
812 /* Open kernel metadata */
813 if (ksess->metadata == NULL && ksess->output_traces) {
814 ret = kernel_open_metadata(ksess);
815 if (ret < 0) {
816 ret = LTTNG_ERR_KERN_META_FAIL;
817 goto error;
818 }
819 }
820
821 /* Open kernel metadata stream */
822 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
823 ret = kernel_open_metadata_stream(ksess);
824 if (ret < 0) {
825 ERR("Kernel create metadata stream failed");
826 ret = LTTNG_ERR_KERN_STREAM_FAIL;
827 goto error;
828 }
829 }
830
831 /* For each channel */
832 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
833 if (kchan->stream_count == 0) {
834 ret = kernel_open_channel_stream(kchan);
835 if (ret < 0) {
836 ret = LTTNG_ERR_KERN_STREAM_FAIL;
837 goto error;
838 }
839 /* Update the stream global counter */
840 ksess->stream_count_global += ret;
841 }
842 }
843
844 /* Setup kernel consumer socket and send fds to it */
845 ret = init_kernel_tracing(ksess);
846 if (ret != 0) {
847 ret = LTTNG_ERR_KERN_START_FAIL;
848 goto error;
849 }
850
851 /* This start the kernel tracing */
852 ret = kernel_start_session(ksess);
853 if (ret < 0) {
854 ret = LTTNG_ERR_KERN_START_FAIL;
855 goto error;
856 }
857
858 /* Quiescent wait after starting trace */
859 kernel_wait_quiescent(kernel_tracer_fd);
860
861 ksess->active = 1;
862
863 ret = LTTNG_OK;
864
865 error:
866 return ret;
867 }
868
869 /*
870 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
871 */
872 int cmd_disable_channel(struct ltt_session *session, int domain,
873 char *channel_name)
874 {
875 int ret;
876 struct ltt_ust_session *usess;
877
878 usess = session->ust_session;
879
880 rcu_read_lock();
881
882 switch (domain) {
883 case LTTNG_DOMAIN_KERNEL:
884 {
885 ret = channel_kernel_disable(session->kernel_session,
886 channel_name);
887 if (ret != LTTNG_OK) {
888 goto error;
889 }
890
891 kernel_wait_quiescent(kernel_tracer_fd);
892 break;
893 }
894 case LTTNG_DOMAIN_UST:
895 {
896 struct ltt_ust_channel *uchan;
897 struct lttng_ht *chan_ht;
898
899 chan_ht = usess->domain_global.channels;
900
901 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
902 if (uchan == NULL) {
903 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
904 goto error;
905 }
906
907 ret = channel_ust_disable(usess, uchan);
908 if (ret != LTTNG_OK) {
909 goto error;
910 }
911 break;
912 }
913 #if 0
914 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
915 case LTTNG_DOMAIN_UST_EXEC_NAME:
916 case LTTNG_DOMAIN_UST_PID:
917 #endif
918 default:
919 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
920 goto error;
921 }
922
923 ret = LTTNG_OK;
924
925 error:
926 rcu_read_unlock();
927 return ret;
928 }
929
930 /*
931 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
932 *
933 * The wpipe arguments is used as a notifier for the kernel thread.
934 */
935 int cmd_enable_channel(struct ltt_session *session,
936 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
937 {
938 int ret;
939 struct ltt_ust_session *usess = session->ust_session;
940 struct lttng_ht *chan_ht;
941
942 assert(session);
943 assert(attr);
944 assert(domain);
945
946 DBG("Enabling channel %s for session %s", attr->name, session->name);
947
948 rcu_read_lock();
949
950 /*
951 * Don't try to enable a channel if the session has been started at
952 * some point in time before. The tracer does not allow it.
953 */
954 if (session->has_been_started) {
955 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
956 goto error;
957 }
958
959 /*
960 * If the session is a live session, remove the switch timer, the
961 * live timer does the same thing but sends also synchronisation
962 * beacons for inactive streams.
963 */
964 if (session->live_timer > 0) {
965 attr->attr.live_timer_interval = session->live_timer;
966 attr->attr.switch_timer_interval = 0;
967 }
968
969 /*
970 * The ringbuffer (both in user space and kernel) behave badly in overwrite
971 * mode and with less than 2 subbuf so block it right away and send back an
972 * invalid attribute error.
973 */
974 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
975 ret = LTTNG_ERR_INVALID;
976 goto error;
977 }
978
979 switch (domain->type) {
980 case LTTNG_DOMAIN_KERNEL:
981 {
982 struct ltt_kernel_channel *kchan;
983
984 kchan = trace_kernel_get_channel_by_name(attr->name,
985 session->kernel_session);
986 if (kchan == NULL) {
987 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
988 if (attr->name[0] != '\0') {
989 session->kernel_session->has_non_default_channel = 1;
990 }
991 } else {
992 ret = channel_kernel_enable(session->kernel_session, kchan);
993 }
994
995 if (ret != LTTNG_OK) {
996 goto error;
997 }
998
999 kernel_wait_quiescent(kernel_tracer_fd);
1000 break;
1001 }
1002 case LTTNG_DOMAIN_UST:
1003 {
1004 struct ltt_ust_channel *uchan;
1005
1006 chan_ht = usess->domain_global.channels;
1007
1008 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1009 if (uchan == NULL) {
1010 ret = channel_ust_create(usess, attr, domain->buf_type);
1011 if (attr->name[0] != '\0') {
1012 usess->has_non_default_channel = 1;
1013 }
1014 } else {
1015 ret = channel_ust_enable(usess, uchan);
1016 }
1017 break;
1018 }
1019 default:
1020 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1021 goto error;
1022 }
1023
1024 error:
1025 rcu_read_unlock();
1026 return ret;
1027 }
1028
1029
1030 /*
1031 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1032 */
1033 int cmd_disable_event(struct ltt_session *session, int domain,
1034 char *channel_name,
1035 struct lttng_event *event)
1036 {
1037 int ret;
1038 char *event_name;
1039
1040 DBG("Disable event command for event \'%s\'", event->name);
1041
1042 event_name = event->name;
1043
1044 /* Error out on unhandled search criteria */
1045 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1046 || event->pid || event->filter || event->exclusion) {
1047 return LTTNG_ERR_UNK;
1048 }
1049 /* Special handling for kernel domain all events. */
1050 if (domain == LTTNG_DOMAIN_KERNEL && !strcmp(event_name, "*")) {
1051 return disable_kevent_all(session, domain, channel_name, event);
1052 }
1053
1054 rcu_read_lock();
1055
1056 switch (domain) {
1057 case LTTNG_DOMAIN_KERNEL:
1058 {
1059 struct ltt_kernel_channel *kchan;
1060 struct ltt_kernel_session *ksess;
1061
1062 ksess = session->kernel_session;
1063
1064 /*
1065 * If a non-default channel has been created in the
1066 * session, explicitely require that -c chan_name needs
1067 * to be provided.
1068 */
1069 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1070 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1071 goto error;
1072 }
1073
1074 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1075 if (kchan == NULL) {
1076 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1077 goto error;
1078 }
1079
1080 switch (event->type) {
1081 case LTTNG_EVENT_ALL:
1082 case LTTNG_EVENT_TRACEPOINT:
1083 ret = event_kernel_disable_tracepoint(kchan, event_name);
1084 if (ret != LTTNG_OK) {
1085 goto error;
1086 }
1087 break;
1088 case LTTNG_EVENT_SYSCALL:
1089 ret = event_kernel_disable_syscall(kchan, event_name);
1090 if (ret != LTTNG_OK) {
1091 goto error;
1092 }
1093 break;
1094 default:
1095 ret = LTTNG_ERR_UNK;
1096 goto error;
1097 }
1098
1099 kernel_wait_quiescent(kernel_tracer_fd);
1100 break;
1101 }
1102 case LTTNG_DOMAIN_UST:
1103 {
1104 struct ltt_ust_channel *uchan;
1105 struct ltt_ust_session *usess;
1106
1107 usess = session->ust_session;
1108
1109 /*
1110 * If a non-default channel has been created in the
1111 * session, explicitely require that -c chan_name needs
1112 * to be provided.
1113 */
1114 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1115 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1116 goto error;
1117 }
1118
1119 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1120 channel_name);
1121 if (uchan == NULL) {
1122 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1123 goto error;
1124 }
1125
1126 switch (event->type) {
1127 case LTTNG_EVENT_ALL:
1128 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1129 if (ret != LTTNG_OK) {
1130 goto error;
1131 }
1132 break;
1133 default:
1134 ret = LTTNG_ERR_UNK;
1135 goto error;
1136 }
1137
1138 DBG3("Disable UST event %s in channel %s completed", event_name,
1139 channel_name);
1140 break;
1141 }
1142 case LTTNG_DOMAIN_LOG4J:
1143 case LTTNG_DOMAIN_JUL:
1144 {
1145 struct agent *agt;
1146 struct ltt_ust_session *usess = session->ust_session;
1147
1148 assert(usess);
1149
1150 switch (event->type) {
1151 case LTTNG_EVENT_ALL:
1152 break;
1153 default:
1154 ret = LTTNG_ERR_UNK;
1155 goto error;
1156 }
1157
1158 agt = trace_ust_find_agent(usess, domain);
1159 if (!agt) {
1160 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1161 goto error;
1162 }
1163 /* The wild card * means that everything should be disabled. */
1164 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1165 ret = event_agent_disable_all(usess, agt);
1166 } else {
1167 ret = event_agent_disable(usess, agt, event_name);
1168 }
1169 if (ret != LTTNG_OK) {
1170 goto error;
1171 }
1172
1173 break;
1174 }
1175 #if 0
1176 case LTTNG_DOMAIN_UST_EXEC_NAME:
1177 case LTTNG_DOMAIN_UST_PID:
1178 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1179 #endif
1180 default:
1181 ret = LTTNG_ERR_UND;
1182 goto error;
1183 }
1184
1185 ret = LTTNG_OK;
1186
1187 error:
1188 rcu_read_unlock();
1189 return ret;
1190 }
1191
1192 /*
1193 * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
1194 */
1195 static
1196 int disable_kevent_all(struct ltt_session *session, int domain,
1197 char *channel_name,
1198 struct lttng_event *event)
1199 {
1200 int ret;
1201
1202 rcu_read_lock();
1203
1204 switch (domain) {
1205 case LTTNG_DOMAIN_KERNEL:
1206 {
1207 struct ltt_kernel_session *ksess;
1208 struct ltt_kernel_channel *kchan;
1209
1210 ksess = session->kernel_session;
1211
1212 /*
1213 * If a non-default channel has been created in the
1214 * session, explicitely require that -c chan_name needs
1215 * to be provided.
1216 */
1217 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1218 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1219 goto error;
1220 }
1221
1222 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1223 if (kchan == NULL) {
1224 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1225 goto error;
1226 }
1227
1228 switch (event->type) {
1229 case LTTNG_EVENT_ALL:
1230 ret = event_kernel_disable_all(kchan);
1231 if (ret != LTTNG_OK) {
1232 goto error;
1233 }
1234 break;
1235 case LTTNG_EVENT_SYSCALL:
1236 ret = event_kernel_disable_syscall(kchan, "");
1237 if (ret != LTTNG_OK) {
1238 goto error;
1239 }
1240 break;
1241 default:
1242 ret = LTTNG_ERR_UNK;
1243 goto error;
1244 }
1245
1246 kernel_wait_quiescent(kernel_tracer_fd);
1247 break;
1248 }
1249 default:
1250 ret = LTTNG_ERR_UND;
1251 goto error;
1252 }
1253
1254 ret = LTTNG_OK;
1255
1256 error:
1257 rcu_read_unlock();
1258 return ret;
1259 }
1260
1261 /*
1262 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1263 */
1264 int cmd_add_context(struct ltt_session *session, int domain,
1265 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1266 {
1267 int ret, chan_kern_created = 0, chan_ust_created = 0;
1268
1269 switch (domain) {
1270 case LTTNG_DOMAIN_KERNEL:
1271 assert(session->kernel_session);
1272
1273 if (session->kernel_session->channel_count == 0) {
1274 /* Create default channel */
1275 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1276 if (ret != LTTNG_OK) {
1277 goto error;
1278 }
1279 chan_kern_created = 1;
1280 }
1281 /* Add kernel context to kernel tracer */
1282 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1283 if (ret != LTTNG_OK) {
1284 goto error;
1285 }
1286 break;
1287 case LTTNG_DOMAIN_UST:
1288 {
1289 struct ltt_ust_session *usess = session->ust_session;
1290 unsigned int chan_count;
1291
1292 assert(usess);
1293
1294 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1295 if (chan_count == 0) {
1296 struct lttng_channel *attr;
1297 /* Create default channel */
1298 attr = channel_new_default_attr(domain, usess->buffer_type);
1299 if (attr == NULL) {
1300 ret = LTTNG_ERR_FATAL;
1301 goto error;
1302 }
1303
1304 ret = channel_ust_create(usess, attr, usess->buffer_type);
1305 if (ret != LTTNG_OK) {
1306 free(attr);
1307 goto error;
1308 }
1309 free(attr);
1310 chan_ust_created = 1;
1311 }
1312
1313 ret = context_ust_add(usess, domain, ctx, channel_name);
1314 if (ret != LTTNG_OK) {
1315 goto error;
1316 }
1317 break;
1318 }
1319 #if 0
1320 case LTTNG_DOMAIN_UST_EXEC_NAME:
1321 case LTTNG_DOMAIN_UST_PID:
1322 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1323 #endif
1324 default:
1325 ret = LTTNG_ERR_UND;
1326 goto error;
1327 }
1328
1329 return LTTNG_OK;
1330
1331 error:
1332 if (chan_kern_created) {
1333 struct ltt_kernel_channel *kchan =
1334 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1335 session->kernel_session);
1336 /* Created previously, this should NOT fail. */
1337 assert(kchan);
1338 kernel_destroy_channel(kchan);
1339 }
1340
1341 if (chan_ust_created) {
1342 struct ltt_ust_channel *uchan =
1343 trace_ust_find_channel_by_name(
1344 session->ust_session->domain_global.channels,
1345 DEFAULT_CHANNEL_NAME);
1346 /* Created previously, this should NOT fail. */
1347 assert(uchan);
1348 /* Remove from the channel list of the session. */
1349 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1350 uchan);
1351 trace_ust_destroy_channel(uchan);
1352 }
1353 return ret;
1354 }
1355
1356 static int validate_event_name(const char *name)
1357 {
1358 int ret = 0;
1359 const char *c = name;
1360 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1361
1362 /*
1363 * Make sure that unescaped wildcards are only used as the last
1364 * character of the event name.
1365 */
1366 while (c < event_name_end) {
1367 switch (*c) {
1368 case '\0':
1369 goto end;
1370 case '\\':
1371 c++;
1372 break;
1373 case '*':
1374 if ((c + 1) < event_name_end && *(c + 1)) {
1375 /* Wildcard is not the last character */
1376 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1377 goto end;
1378 }
1379 default:
1380 break;
1381 }
1382 c++;
1383 }
1384 end:
1385 return ret;
1386 }
1387
1388 /*
1389 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1390 * We own filter, exclusion, and filter_expression.
1391 */
1392 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1393 char *channel_name, struct lttng_event *event,
1394 char *filter_expression,
1395 struct lttng_filter_bytecode *filter,
1396 struct lttng_event_exclusion *exclusion,
1397 int wpipe)
1398 {
1399 int ret, channel_created = 0;
1400 struct lttng_channel *attr;
1401
1402 assert(session);
1403 assert(event);
1404 assert(channel_name);
1405
1406 DBG("Enable event command for event \'%s\'", event->name);
1407
1408 /* Special handling for kernel domain all events. */
1409 if (domain->type == LTTNG_DOMAIN_KERNEL && !strcmp(event->name, "*")) {
1410 return enable_kevent_all(session, domain, channel_name, event,
1411 filter_expression, filter, wpipe);
1412 }
1413
1414 ret = validate_event_name(event->name);
1415 if (ret) {
1416 goto error;
1417 }
1418
1419 rcu_read_lock();
1420
1421 switch (domain->type) {
1422 case LTTNG_DOMAIN_KERNEL:
1423 {
1424 struct ltt_kernel_channel *kchan;
1425
1426 /*
1427 * If a non-default channel has been created in the
1428 * session, explicitely require that -c chan_name needs
1429 * to be provided.
1430 */
1431 if (session->kernel_session->has_non_default_channel
1432 && channel_name[0] == '\0') {
1433 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1434 goto error;
1435 }
1436
1437 kchan = trace_kernel_get_channel_by_name(channel_name,
1438 session->kernel_session);
1439 if (kchan == NULL) {
1440 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1441 LTTNG_BUFFER_GLOBAL);
1442 if (attr == NULL) {
1443 ret = LTTNG_ERR_FATAL;
1444 goto error;
1445 }
1446 strncpy(attr->name, channel_name, sizeof(attr->name));
1447
1448 ret = cmd_enable_channel(session, domain, attr, wpipe);
1449 if (ret != LTTNG_OK) {
1450 free(attr);
1451 goto error;
1452 }
1453 free(attr);
1454
1455 channel_created = 1;
1456 }
1457
1458 /* Get the newly created kernel channel pointer */
1459 kchan = trace_kernel_get_channel_by_name(channel_name,
1460 session->kernel_session);
1461 if (kchan == NULL) {
1462 /* This sould not happen... */
1463 ret = LTTNG_ERR_FATAL;
1464 goto error;
1465 }
1466
1467 switch (event->type) {
1468 case LTTNG_EVENT_ALL:
1469 case LTTNG_EVENT_PROBE:
1470 case LTTNG_EVENT_FUNCTION:
1471 case LTTNG_EVENT_FUNCTION_ENTRY:
1472 case LTTNG_EVENT_TRACEPOINT:
1473 ret = event_kernel_enable_tracepoint(kchan, event);
1474 if (ret != LTTNG_OK) {
1475 if (channel_created) {
1476 /* Let's not leak a useless channel. */
1477 kernel_destroy_channel(kchan);
1478 }
1479 goto error;
1480 }
1481 break;
1482 case LTTNG_EVENT_SYSCALL:
1483 ret = event_kernel_enable_syscall(kchan, event->name);
1484 if (ret != LTTNG_OK) {
1485 goto error;
1486 }
1487 break;
1488 default:
1489 ret = LTTNG_ERR_UNK;
1490 goto error;
1491 }
1492
1493 kernel_wait_quiescent(kernel_tracer_fd);
1494 break;
1495 }
1496 case LTTNG_DOMAIN_UST:
1497 {
1498 struct ltt_ust_channel *uchan;
1499 struct ltt_ust_session *usess = session->ust_session;
1500
1501 assert(usess);
1502
1503 /*
1504 * If a non-default channel has been created in the
1505 * session, explicitely require that -c chan_name needs
1506 * to be provided.
1507 */
1508 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1509 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1510 goto error;
1511 }
1512
1513 /* Get channel from global UST domain */
1514 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1515 channel_name);
1516 if (uchan == NULL) {
1517 /* Create default channel */
1518 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1519 usess->buffer_type);
1520 if (attr == NULL) {
1521 ret = LTTNG_ERR_FATAL;
1522 goto error;
1523 }
1524 strncpy(attr->name, channel_name, sizeof(attr->name));
1525
1526 ret = cmd_enable_channel(session, domain, attr, wpipe);
1527 if (ret != LTTNG_OK) {
1528 free(attr);
1529 goto error;
1530 }
1531 free(attr);
1532
1533 /* Get the newly created channel reference back */
1534 uchan = trace_ust_find_channel_by_name(
1535 usess->domain_global.channels, channel_name);
1536 assert(uchan);
1537 }
1538
1539 /* At this point, the session and channel exist on the tracer */
1540 ret = event_ust_enable_tracepoint(usess, uchan, event,
1541 filter_expression, filter, exclusion);
1542 /* We have passed ownership */
1543 filter_expression = NULL;
1544 filter = NULL;
1545 exclusion = NULL;
1546 if (ret != LTTNG_OK) {
1547 goto error;
1548 }
1549 break;
1550 }
1551 case LTTNG_DOMAIN_LOG4J:
1552 case LTTNG_DOMAIN_JUL:
1553 {
1554 const char *default_event_name, *default_chan_name;
1555 struct agent *agt;
1556 struct lttng_event uevent;
1557 struct lttng_domain tmp_dom;
1558 struct ltt_ust_session *usess = session->ust_session;
1559
1560 assert(usess);
1561
1562 agt = trace_ust_find_agent(usess, domain->type);
1563 if (!agt) {
1564 agt = agent_create(domain->type);
1565 if (!agt) {
1566 ret = -LTTNG_ERR_NOMEM;
1567 goto error;
1568 }
1569 agent_add(agt, usess->agents);
1570 }
1571
1572 /* Create the default tracepoint. */
1573 memset(&uevent, 0, sizeof(uevent));
1574 uevent.type = LTTNG_EVENT_TRACEPOINT;
1575 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1576 default_event_name = event_get_default_agent_ust_name(domain->type);
1577 if (!default_event_name) {
1578 ret = -LTTNG_ERR_FATAL;
1579 goto error;
1580 }
1581 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1582 uevent.name[sizeof(uevent.name) - 1] = '\0';
1583
1584 /*
1585 * The domain type is changed because we are about to enable the
1586 * default channel and event for the JUL domain that are hardcoded.
1587 * This happens in the UST domain.
1588 */
1589 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1590 tmp_dom.type = LTTNG_DOMAIN_UST;
1591
1592 if (domain->type == LTTNG_DOMAIN_LOG4J) {
1593 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1594 } else {
1595 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1596 }
1597
1598 {
1599 struct lttng_filter_bytecode *filter_copy = NULL;
1600
1601 if (filter) {
1602 filter_copy = zmalloc(
1603 sizeof(struct lttng_filter_bytecode)
1604 + filter->len);
1605 if (!filter_copy) {
1606 goto error;
1607 }
1608
1609 memcpy(filter_copy, filter,
1610 sizeof(struct lttng_filter_bytecode)
1611 + filter->len);
1612 }
1613
1614 ret = cmd_enable_event(session, &tmp_dom,
1615 (char *) default_chan_name,
1616 &uevent, filter_expression, filter_copy,
1617 NULL, wpipe);
1618 /* We have passed ownership */
1619 filter_expression = NULL;
1620 }
1621
1622 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1623 goto error;
1624 }
1625
1626 /* The wild card * means that everything should be enabled. */
1627 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1628 ret = event_agent_enable_all(usess, agt, event, filter);
1629 filter = NULL;
1630 } else {
1631 ret = event_agent_enable(usess, agt, event, filter);
1632 filter = NULL;
1633 }
1634 if (ret != LTTNG_OK) {
1635 goto error;
1636 }
1637
1638 break;
1639 }
1640 #if 0
1641 case LTTNG_DOMAIN_UST_EXEC_NAME:
1642 case LTTNG_DOMAIN_UST_PID:
1643 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1644 #endif
1645 default:
1646 ret = LTTNG_ERR_UND;
1647 goto error;
1648 }
1649
1650 ret = LTTNG_OK;
1651
1652 error:
1653 free(filter_expression);
1654 free(filter);
1655 free(exclusion);
1656 rcu_read_unlock();
1657 return ret;
1658 }
1659
1660 /*
1661 * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
1662 */
1663 static
1664 int enable_kevent_all(struct ltt_session *session,
1665 struct lttng_domain *domain, char *channel_name,
1666 struct lttng_event *event,
1667 char *filter_expression,
1668 struct lttng_filter_bytecode *filter, int wpipe)
1669 {
1670 int ret;
1671 struct lttng_channel *attr;
1672
1673 assert(session);
1674 assert(channel_name);
1675
1676 rcu_read_lock();
1677
1678 switch (domain->type) {
1679 case LTTNG_DOMAIN_KERNEL:
1680 {
1681 struct ltt_kernel_channel *kchan;
1682
1683 assert(session->kernel_session);
1684
1685 /*
1686 * If a non-default channel has been created in the
1687 * session, explicitely require that -c chan_name needs
1688 * to be provided.
1689 */
1690 if (session->kernel_session->has_non_default_channel
1691 && channel_name[0] == '\0') {
1692 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1693 goto error;
1694 }
1695
1696 kchan = trace_kernel_get_channel_by_name(channel_name,
1697 session->kernel_session);
1698 if (kchan == NULL) {
1699 /* Create default channel */
1700 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1701 LTTNG_BUFFER_GLOBAL);
1702 if (attr == NULL) {
1703 ret = LTTNG_ERR_FATAL;
1704 goto error;
1705 }
1706 strncpy(attr->name, channel_name, sizeof(attr->name));
1707
1708 ret = cmd_enable_channel(session, domain, attr, wpipe);
1709 if (ret != LTTNG_OK) {
1710 free(attr);
1711 goto error;
1712 }
1713 free(attr);
1714
1715 /* Get the newly created kernel channel pointer */
1716 kchan = trace_kernel_get_channel_by_name(channel_name,
1717 session->kernel_session);
1718 assert(kchan);
1719 }
1720
1721 switch (event->type) {
1722 case LTTNG_EVENT_SYSCALL:
1723 ret = event_kernel_enable_syscall(kchan, "");
1724 if (ret != LTTNG_OK) {
1725 goto error;
1726 }
1727 break;
1728 case LTTNG_EVENT_TRACEPOINT:
1729 /*
1730 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1731 * events already registered to the channel.
1732 */
1733 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1734 break;
1735 case LTTNG_EVENT_ALL:
1736 /* Enable syscalls and tracepoints */
1737 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1738 break;
1739 default:
1740 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1741 goto error;
1742 }
1743
1744 /* Manage return value */
1745 if (ret != LTTNG_OK) {
1746 /*
1747 * On error, cmd_enable_channel call will take care of destroying
1748 * the created channel if it was needed.
1749 */
1750 goto error;
1751 }
1752
1753 kernel_wait_quiescent(kernel_tracer_fd);
1754 break;
1755 }
1756 default:
1757 ret = LTTNG_ERR_UND;
1758 goto error;
1759 }
1760
1761 ret = LTTNG_OK;
1762
1763 error:
1764 rcu_read_unlock();
1765 return ret;
1766 }
1767
1768
1769 /*
1770 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1771 */
1772 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1773 {
1774 int ret;
1775 ssize_t nb_events = 0;
1776
1777 switch (domain) {
1778 case LTTNG_DOMAIN_KERNEL:
1779 nb_events = kernel_list_events(kernel_tracer_fd, events);
1780 if (nb_events < 0) {
1781 ret = LTTNG_ERR_KERN_LIST_FAIL;
1782 goto error;
1783 }
1784 break;
1785 case LTTNG_DOMAIN_UST:
1786 nb_events = ust_app_list_events(events);
1787 if (nb_events < 0) {
1788 ret = LTTNG_ERR_UST_LIST_FAIL;
1789 goto error;
1790 }
1791 break;
1792 case LTTNG_DOMAIN_LOG4J:
1793 case LTTNG_DOMAIN_JUL:
1794 nb_events = agent_list_events(events, domain);
1795 if (nb_events < 0) {
1796 ret = LTTNG_ERR_UST_LIST_FAIL;
1797 goto error;
1798 }
1799 break;
1800 default:
1801 ret = LTTNG_ERR_UND;
1802 goto error;
1803 }
1804
1805 return nb_events;
1806
1807 error:
1808 /* Return negative value to differentiate return code */
1809 return -ret;
1810 }
1811
1812 /*
1813 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1814 */
1815 ssize_t cmd_list_tracepoint_fields(int domain,
1816 struct lttng_event_field **fields)
1817 {
1818 int ret;
1819 ssize_t nb_fields = 0;
1820
1821 switch (domain) {
1822 case LTTNG_DOMAIN_UST:
1823 nb_fields = ust_app_list_event_fields(fields);
1824 if (nb_fields < 0) {
1825 ret = LTTNG_ERR_UST_LIST_FAIL;
1826 goto error;
1827 }
1828 break;
1829 case LTTNG_DOMAIN_KERNEL:
1830 default: /* fall-through */
1831 ret = LTTNG_ERR_UND;
1832 goto error;
1833 }
1834
1835 return nb_fields;
1836
1837 error:
1838 /* Return negative value to differentiate return code */
1839 return -ret;
1840 }
1841
1842 ssize_t cmd_list_syscalls(struct lttng_event **events)
1843 {
1844 return syscall_table_list(events);
1845 }
1846
1847 /*
1848 * Command LTTNG_START_TRACE processed by the client thread.
1849 */
1850 int cmd_start_trace(struct ltt_session *session)
1851 {
1852 int ret;
1853 unsigned long nb_chan = 0;
1854 struct ltt_kernel_session *ksession;
1855 struct ltt_ust_session *usess;
1856
1857 assert(session);
1858
1859 /* Ease our life a bit ;) */
1860 ksession = session->kernel_session;
1861 usess = session->ust_session;
1862
1863 /* Is the session already started? */
1864 if (session->active) {
1865 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1866 goto error;
1867 }
1868
1869 /*
1870 * Starting a session without channel is useless since after that it's not
1871 * possible to enable channel thus inform the client.
1872 */
1873 if (usess && usess->domain_global.channels) {
1874 rcu_read_lock();
1875 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1876 rcu_read_unlock();
1877 }
1878 if (ksession) {
1879 nb_chan += ksession->channel_count;
1880 }
1881 if (!nb_chan) {
1882 ret = LTTNG_ERR_NO_CHANNEL;
1883 goto error;
1884 }
1885
1886 /* Kernel tracing */
1887 if (ksession != NULL) {
1888 ret = start_kernel_session(ksession, kernel_tracer_fd);
1889 if (ret != LTTNG_OK) {
1890 goto error;
1891 }
1892 }
1893
1894 /* Flag session that trace should start automatically */
1895 if (usess) {
1896 /*
1897 * Even though the start trace might fail, flag this session active so
1898 * other application coming in are started by default.
1899 */
1900 usess->active = 1;
1901
1902 ret = ust_app_start_trace_all(usess);
1903 if (ret < 0) {
1904 ret = LTTNG_ERR_UST_START_FAIL;
1905 goto error;
1906 }
1907 }
1908
1909 /* Flag this after a successful start. */
1910 session->has_been_started = 1;
1911 session->active = 1;
1912
1913 ret = LTTNG_OK;
1914
1915 error:
1916 return ret;
1917 }
1918
1919 /*
1920 * Command LTTNG_STOP_TRACE processed by the client thread.
1921 */
1922 int cmd_stop_trace(struct ltt_session *session)
1923 {
1924 int ret;
1925 struct ltt_kernel_channel *kchan;
1926 struct ltt_kernel_session *ksession;
1927 struct ltt_ust_session *usess;
1928
1929 assert(session);
1930
1931 /* Short cut */
1932 ksession = session->kernel_session;
1933 usess = session->ust_session;
1934
1935 /* Session is not active. Skip everythong and inform the client. */
1936 if (!session->active) {
1937 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1938 goto error;
1939 }
1940
1941 /* Kernel tracer */
1942 if (ksession && ksession->active) {
1943 DBG("Stop kernel tracing");
1944
1945 /* Flush metadata if exist */
1946 if (ksession->metadata_stream_fd >= 0) {
1947 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1948 if (ret < 0) {
1949 ERR("Kernel metadata flush failed");
1950 }
1951 }
1952
1953 /* Flush all buffers before stopping */
1954 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1955 ret = kernel_flush_buffer(kchan);
1956 if (ret < 0) {
1957 ERR("Kernel flush buffer error");
1958 }
1959 }
1960
1961 ret = kernel_stop_session(ksession);
1962 if (ret < 0) {
1963 ret = LTTNG_ERR_KERN_STOP_FAIL;
1964 goto error;
1965 }
1966
1967 kernel_wait_quiescent(kernel_tracer_fd);
1968
1969 ksession->active = 0;
1970 }
1971
1972 if (usess && usess->active) {
1973 /*
1974 * Even though the stop trace might fail, flag this session inactive so
1975 * other application coming in are not started by default.
1976 */
1977 usess->active = 0;
1978
1979 ret = ust_app_stop_trace_all(usess);
1980 if (ret < 0) {
1981 ret = LTTNG_ERR_UST_STOP_FAIL;
1982 goto error;
1983 }
1984 }
1985
1986 /* Flag inactive after a successful stop. */
1987 session->active = 0;
1988 ret = LTTNG_OK;
1989
1990 error:
1991 return ret;
1992 }
1993
1994 /*
1995 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1996 */
1997 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1998 size_t nb_uri, struct lttng_uri *uris)
1999 {
2000 int ret, i;
2001 struct ltt_kernel_session *ksess = session->kernel_session;
2002 struct ltt_ust_session *usess = session->ust_session;
2003 struct consumer_output *consumer = NULL;
2004
2005 assert(session);
2006 assert(uris);
2007 assert(nb_uri > 0);
2008
2009 /* Can't set consumer URI if the session is active. */
2010 if (session->active) {
2011 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2012 goto error;
2013 }
2014
2015 /*
2016 * This case switch makes sure the domain session has a temporary consumer
2017 * so the URL can be set.
2018 */
2019 switch (domain) {
2020 case 0:
2021 /* Code flow error. A session MUST always have a consumer object */
2022 assert(session->consumer);
2023 /*
2024 * The URL will be added to the tracing session consumer instead of a
2025 * specific domain consumer.
2026 */
2027 consumer = session->consumer;
2028 break;
2029 case LTTNG_DOMAIN_KERNEL:
2030 /* Code flow error if we don't have a kernel session here. */
2031 assert(ksess);
2032 assert(ksess->consumer);
2033 consumer = ksess->consumer;
2034 break;
2035 case LTTNG_DOMAIN_UST:
2036 /* Code flow error if we don't have a kernel session here. */
2037 assert(usess);
2038 assert(usess->consumer);
2039 consumer = usess->consumer;
2040 break;
2041 }
2042
2043 for (i = 0; i < nb_uri; i++) {
2044 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
2045 if (ret != LTTNG_OK) {
2046 goto error;
2047 }
2048 }
2049
2050 /*
2051 * Make sure to set the session in output mode after we set URI since a
2052 * session can be created without URL (thus flagged in no output mode).
2053 */
2054 session->output_traces = 1;
2055 if (ksess) {
2056 ksess->output_traces = 1;
2057 } else if (usess) {
2058 usess->output_traces = 1;
2059 }
2060
2061 /* All good! */
2062 ret = LTTNG_OK;
2063
2064 error:
2065 return ret;
2066 }
2067
2068 /*
2069 * Command LTTNG_CREATE_SESSION processed by the client thread.
2070 */
2071 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2072 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2073 {
2074 int ret;
2075 struct ltt_session *session;
2076
2077 assert(name);
2078 assert(creds);
2079
2080 /*
2081 * Verify if the session already exist
2082 *
2083 * XXX: There is no need for the session lock list here since the caller
2084 * (process_client_msg) is holding it. We might want to change that so a
2085 * single command does not lock the entire session list.
2086 */
2087 session = session_find_by_name(name);
2088 if (session != NULL) {
2089 ret = LTTNG_ERR_EXIST_SESS;
2090 goto find_error;
2091 }
2092
2093 /* Create tracing session in the registry */
2094 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2095 LTTNG_SOCK_GET_GID_CRED(creds));
2096 if (ret != LTTNG_OK) {
2097 goto session_error;
2098 }
2099
2100 /*
2101 * Get the newly created session pointer back
2102 *
2103 * XXX: There is no need for the session lock list here since the caller
2104 * (process_client_msg) is holding it. We might want to change that so a
2105 * single command does not lock the entire session list.
2106 */
2107 session = session_find_by_name(name);
2108 assert(session);
2109
2110 session->live_timer = live_timer;
2111 /* Create default consumer output for the session not yet created. */
2112 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2113 if (session->consumer == NULL) {
2114 ret = LTTNG_ERR_FATAL;
2115 goto consumer_error;
2116 }
2117
2118 if (uris) {
2119 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2120 if (ret != LTTNG_OK) {
2121 goto consumer_error;
2122 }
2123 session->output_traces = 1;
2124 } else {
2125 session->output_traces = 0;
2126 DBG2("Session %s created with no output", session->name);
2127 }
2128
2129 session->consumer->enabled = 1;
2130
2131 return LTTNG_OK;
2132
2133 consumer_error:
2134 session_destroy(session);
2135 session_error:
2136 find_error:
2137 return ret;
2138 }
2139
2140 /*
2141 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2142 */
2143 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2144 size_t nb_uri, lttng_sock_cred *creds)
2145 {
2146 int ret;
2147 struct ltt_session *session;
2148 struct snapshot_output *new_output = NULL;
2149
2150 assert(name);
2151 assert(creds);
2152
2153 /*
2154 * Create session in no output mode with URIs set to NULL. The uris we've
2155 * received are for a default snapshot output if one.
2156 */
2157 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2158 if (ret != LTTNG_OK) {
2159 goto error;
2160 }
2161
2162 /* Get the newly created session pointer back. This should NEVER fail. */
2163 session = session_find_by_name(name);
2164 assert(session);
2165
2166 /* Flag session for snapshot mode. */
2167 session->snapshot_mode = 1;
2168
2169 /* Skip snapshot output creation if no URI is given. */
2170 if (nb_uri == 0) {
2171 goto end;
2172 }
2173
2174 new_output = snapshot_output_alloc();
2175 if (!new_output) {
2176 ret = LTTNG_ERR_NOMEM;
2177 goto error_snapshot_alloc;
2178 }
2179
2180 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2181 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2182 if (ret < 0) {
2183 if (ret == -ENOMEM) {
2184 ret = LTTNG_ERR_NOMEM;
2185 } else {
2186 ret = LTTNG_ERR_INVALID;
2187 }
2188 goto error_snapshot;
2189 }
2190
2191 rcu_read_lock();
2192 snapshot_add_output(&session->snapshot, new_output);
2193 rcu_read_unlock();
2194
2195 end:
2196 return LTTNG_OK;
2197
2198 error_snapshot:
2199 snapshot_output_destroy(new_output);
2200 error_snapshot_alloc:
2201 session_destroy(session);
2202 error:
2203 return ret;
2204 }
2205
2206 /*
2207 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2208 */
2209 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2210 {
2211 int ret;
2212 struct ltt_ust_session *usess;
2213 struct ltt_kernel_session *ksess;
2214
2215 /* Safety net */
2216 assert(session);
2217
2218 usess = session->ust_session;
2219 ksess = session->kernel_session;
2220
2221 /* Clean kernel session teardown */
2222 kernel_destroy_session(ksess);
2223
2224 /* UST session teardown */
2225 if (usess) {
2226 /* Close any relayd session */
2227 consumer_output_send_destroy_relayd(usess->consumer);
2228
2229 /* Destroy every UST application related to this session. */
2230 ret = ust_app_destroy_trace_all(usess);
2231 if (ret) {
2232 ERR("Error in ust_app_destroy_trace_all");
2233 }
2234
2235 /* Clean up the rest. */
2236 trace_ust_destroy_session(usess);
2237 }
2238
2239 /*
2240 * Must notify the kernel thread here to update it's poll set in order to
2241 * remove the channel(s)' fd just destroyed.
2242 */
2243 ret = notify_thread_pipe(wpipe);
2244 if (ret < 0) {
2245 PERROR("write kernel poll pipe");
2246 }
2247
2248 ret = session_destroy(session);
2249
2250 return ret;
2251 }
2252
2253 /*
2254 * Command LTTNG_CALIBRATE processed by the client thread.
2255 */
2256 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2257 {
2258 int ret;
2259
2260 switch (domain) {
2261 case LTTNG_DOMAIN_KERNEL:
2262 {
2263 struct lttng_kernel_calibrate kcalibrate;
2264
2265 switch (calibrate->type) {
2266 case LTTNG_CALIBRATE_FUNCTION:
2267 default:
2268 /* Default and only possible calibrate option. */
2269 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2270 break;
2271 }
2272
2273 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2274 if (ret < 0) {
2275 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2276 goto error;
2277 }
2278 break;
2279 }
2280 case LTTNG_DOMAIN_UST:
2281 {
2282 struct lttng_ust_calibrate ucalibrate;
2283
2284 switch (calibrate->type) {
2285 case LTTNG_CALIBRATE_FUNCTION:
2286 default:
2287 /* Default and only possible calibrate option. */
2288 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2289 break;
2290 }
2291
2292 ret = ust_app_calibrate_glb(&ucalibrate);
2293 if (ret < 0) {
2294 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2295 goto error;
2296 }
2297 break;
2298 }
2299 default:
2300 ret = LTTNG_ERR_UND;
2301 goto error;
2302 }
2303
2304 ret = LTTNG_OK;
2305
2306 error:
2307 return ret;
2308 }
2309
2310 /*
2311 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2312 */
2313 int cmd_register_consumer(struct ltt_session *session, int domain,
2314 const char *sock_path, struct consumer_data *cdata)
2315 {
2316 int ret, sock;
2317 struct consumer_socket *socket = NULL;
2318
2319 assert(session);
2320 assert(cdata);
2321 assert(sock_path);
2322
2323 switch (domain) {
2324 case LTTNG_DOMAIN_KERNEL:
2325 {
2326 struct ltt_kernel_session *ksess = session->kernel_session;
2327
2328 assert(ksess);
2329
2330 /* Can't register a consumer if there is already one */
2331 if (ksess->consumer_fds_sent != 0) {
2332 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2333 goto error;
2334 }
2335
2336 sock = lttcomm_connect_unix_sock(sock_path);
2337 if (sock < 0) {
2338 ret = LTTNG_ERR_CONNECT_FAIL;
2339 goto error;
2340 }
2341 cdata->cmd_sock = sock;
2342
2343 socket = consumer_allocate_socket(&cdata->cmd_sock);
2344 if (socket == NULL) {
2345 ret = close(sock);
2346 if (ret < 0) {
2347 PERROR("close register consumer");
2348 }
2349 cdata->cmd_sock = -1;
2350 ret = LTTNG_ERR_FATAL;
2351 goto error;
2352 }
2353
2354 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2355 if (socket->lock == NULL) {
2356 PERROR("zmalloc pthread mutex");
2357 ret = LTTNG_ERR_FATAL;
2358 goto error;
2359 }
2360 pthread_mutex_init(socket->lock, NULL);
2361 socket->registered = 1;
2362
2363 rcu_read_lock();
2364 consumer_add_socket(socket, ksess->consumer);
2365 rcu_read_unlock();
2366
2367 pthread_mutex_lock(&cdata->pid_mutex);
2368 cdata->pid = -1;
2369 pthread_mutex_unlock(&cdata->pid_mutex);
2370
2371 break;
2372 }
2373 default:
2374 /* TODO: Userspace tracing */
2375 ret = LTTNG_ERR_UND;
2376 goto error;
2377 }
2378
2379 return LTTNG_OK;
2380
2381 error:
2382 if (socket) {
2383 consumer_destroy_socket(socket);
2384 }
2385 return ret;
2386 }
2387
2388 /*
2389 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2390 */
2391 ssize_t cmd_list_domains(struct ltt_session *session,
2392 struct lttng_domain **domains)
2393 {
2394 int ret, index = 0;
2395 ssize_t nb_dom = 0;
2396 struct agent *agt;
2397 struct lttng_ht_iter iter;
2398
2399 if (session->kernel_session != NULL) {
2400 DBG3("Listing domains found kernel domain");
2401 nb_dom++;
2402 }
2403
2404 if (session->ust_session != NULL) {
2405 DBG3("Listing domains found UST global domain");
2406 nb_dom++;
2407
2408 rcu_read_lock();
2409 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2410 agt, node.node) {
2411 if (agt->being_used) {
2412 nb_dom++;
2413 }
2414 }
2415 rcu_read_unlock();
2416 }
2417
2418 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2419 if (*domains == NULL) {
2420 ret = LTTNG_ERR_FATAL;
2421 goto error;
2422 }
2423
2424 if (session->kernel_session != NULL) {
2425 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2426 index++;
2427 }
2428
2429 if (session->ust_session != NULL) {
2430 (*domains)[index].type = LTTNG_DOMAIN_UST;
2431 (*domains)[index].buf_type = session->ust_session->buffer_type;
2432 index++;
2433
2434 rcu_read_lock();
2435 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2436 agt, node.node) {
2437 if (agt->being_used) {
2438 (*domains)[index].type = agt->domain;
2439 (*domains)[index].buf_type = session->ust_session->buffer_type;
2440 index++;
2441 }
2442 }
2443 rcu_read_unlock();
2444 }
2445
2446 return nb_dom;
2447
2448 error:
2449 /* Return negative value to differentiate return code */
2450 return -ret;
2451 }
2452
2453
2454 /*
2455 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2456 */
2457 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2458 struct lttng_channel **channels)
2459 {
2460 int ret;
2461 ssize_t nb_chan = 0;
2462
2463 switch (domain) {
2464 case LTTNG_DOMAIN_KERNEL:
2465 if (session->kernel_session != NULL) {
2466 nb_chan = session->kernel_session->channel_count;
2467 }
2468 DBG3("Number of kernel channels %zd", nb_chan);
2469 if (nb_chan <= 0) {
2470 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2471 }
2472 break;
2473 case LTTNG_DOMAIN_UST:
2474 if (session->ust_session != NULL) {
2475 rcu_read_lock();
2476 nb_chan = lttng_ht_get_count(
2477 session->ust_session->domain_global.channels);
2478 rcu_read_unlock();
2479 }
2480 DBG3("Number of UST global channels %zd", nb_chan);
2481 if (nb_chan < 0) {
2482 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2483 goto error;
2484 }
2485 break;
2486 default:
2487 ret = LTTNG_ERR_UND;
2488 goto error;
2489 }
2490
2491 if (nb_chan > 0) {
2492 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2493 if (*channels == NULL) {
2494 ret = LTTNG_ERR_FATAL;
2495 goto error;
2496 }
2497
2498 list_lttng_channels(domain, session, *channels);
2499 }
2500
2501 return nb_chan;
2502
2503 error:
2504 /* Return negative value to differentiate return code */
2505 return -ret;
2506 }
2507
2508 /*
2509 * Command LTTNG_LIST_EVENTS processed by the client thread.
2510 */
2511 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2512 char *channel_name, struct lttng_event **events)
2513 {
2514 int ret = 0;
2515 ssize_t nb_event = 0;
2516
2517 switch (domain) {
2518 case LTTNG_DOMAIN_KERNEL:
2519 if (session->kernel_session != NULL) {
2520 nb_event = list_lttng_kernel_events(channel_name,
2521 session->kernel_session, events);
2522 }
2523 break;
2524 case LTTNG_DOMAIN_UST:
2525 {
2526 if (session->ust_session != NULL) {
2527 nb_event = list_lttng_ust_global_events(channel_name,
2528 &session->ust_session->domain_global, events);
2529 }
2530 break;
2531 }
2532 case LTTNG_DOMAIN_LOG4J:
2533 case LTTNG_DOMAIN_JUL:
2534 if (session->ust_session) {
2535 struct lttng_ht_iter iter;
2536 struct agent *agt;
2537
2538 rcu_read_lock();
2539 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2540 &iter.iter, agt, node.node) {
2541 nb_event = list_lttng_agent_events(agt, events);
2542 }
2543 rcu_read_unlock();
2544 }
2545 break;
2546 default:
2547 ret = LTTNG_ERR_UND;
2548 goto error;
2549 }
2550
2551 return nb_event;
2552
2553 error:
2554 /* Return negative value to differentiate return code */
2555 return -ret;
2556 }
2557
2558 /*
2559 * Using the session list, filled a lttng_session array to send back to the
2560 * client for session listing.
2561 *
2562 * The session list lock MUST be acquired before calling this function. Use
2563 * session_lock_list() and session_unlock_list().
2564 */
2565 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2566 gid_t gid)
2567 {
2568 int ret;
2569 unsigned int i = 0;
2570 struct ltt_session *session;
2571 struct ltt_session_list *list = session_get_list();
2572
2573 DBG("Getting all available session for UID %d GID %d",
2574 uid, gid);
2575 /*
2576 * Iterate over session list and append data after the control struct in
2577 * the buffer.
2578 */
2579 cds_list_for_each_entry(session, &list->head, list) {
2580 /*
2581 * Only list the sessions the user can control.
2582 */
2583 if (!session_access_ok(session, uid, gid)) {
2584 continue;
2585 }
2586
2587 struct ltt_kernel_session *ksess = session->kernel_session;
2588 struct ltt_ust_session *usess = session->ust_session;
2589
2590 if (session->consumer->type == CONSUMER_DST_NET ||
2591 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2592 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2593 ret = build_network_session_path(sessions[i].path,
2594 sizeof(sessions[i].path), session);
2595 } else {
2596 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2597 session->consumer->dst.trace_path);
2598 }
2599 if (ret < 0) {
2600 PERROR("snprintf session path");
2601 continue;
2602 }
2603
2604 strncpy(sessions[i].name, session->name, NAME_MAX);
2605 sessions[i].name[NAME_MAX - 1] = '\0';
2606 sessions[i].enabled = session->active;
2607 sessions[i].snapshot_mode = session->snapshot_mode;
2608 sessions[i].live_timer_interval = session->live_timer;
2609 i++;
2610 }
2611 }
2612
2613 /*
2614 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2615 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2616 */
2617 int cmd_data_pending(struct ltt_session *session)
2618 {
2619 int ret;
2620 struct ltt_kernel_session *ksess = session->kernel_session;
2621 struct ltt_ust_session *usess = session->ust_session;
2622
2623 assert(session);
2624
2625 /* Session MUST be stopped to ask for data availability. */
2626 if (session->active) {
2627 ret = LTTNG_ERR_SESSION_STARTED;
2628 goto error;
2629 } else {
2630 /*
2631 * If stopped, just make sure we've started before else the above call
2632 * will always send that there is data pending.
2633 *
2634 * The consumer assumes that when the data pending command is received,
2635 * the trace has been started before or else no output data is written
2636 * by the streams which is a condition for data pending. So, this is
2637 * *VERY* important that we don't ask the consumer before a start
2638 * trace.
2639 */
2640 if (!session->has_been_started) {
2641 ret = 0;
2642 goto error;
2643 }
2644 }
2645
2646 if (ksess && ksess->consumer) {
2647 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2648 if (ret == 1) {
2649 /* Data is still being extracted for the kernel. */
2650 goto error;
2651 }
2652 }
2653
2654 if (usess && usess->consumer) {
2655 ret = consumer_is_data_pending(usess->id, usess->consumer);
2656 if (ret == 1) {
2657 /* Data is still being extracted for the kernel. */
2658 goto error;
2659 }
2660 }
2661
2662 /* Data is ready to be read by a viewer */
2663 ret = 0;
2664
2665 error:
2666 return ret;
2667 }
2668
2669 /*
2670 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2671 *
2672 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2673 */
2674 int cmd_snapshot_add_output(struct ltt_session *session,
2675 struct lttng_snapshot_output *output, uint32_t *id)
2676 {
2677 int ret;
2678 struct snapshot_output *new_output;
2679
2680 assert(session);
2681 assert(output);
2682
2683 DBG("Cmd snapshot add output for session %s", session->name);
2684
2685 /*
2686 * Permission denied to create an output if the session is not
2687 * set in no output mode.
2688 */
2689 if (session->output_traces) {
2690 ret = LTTNG_ERR_EPERM;
2691 goto error;
2692 }
2693
2694 /* Only one output is allowed until we have the "tee" feature. */
2695 if (session->snapshot.nb_output == 1) {
2696 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2697 goto error;
2698 }
2699
2700 new_output = snapshot_output_alloc();
2701 if (!new_output) {
2702 ret = LTTNG_ERR_NOMEM;
2703 goto error;
2704 }
2705
2706 ret = snapshot_output_init(output->max_size, output->name,
2707 output->ctrl_url, output->data_url, session->consumer, new_output,
2708 &session->snapshot);
2709 if (ret < 0) {
2710 if (ret == -ENOMEM) {
2711 ret = LTTNG_ERR_NOMEM;
2712 } else {
2713 ret = LTTNG_ERR_INVALID;
2714 }
2715 goto free_error;
2716 }
2717
2718 rcu_read_lock();
2719 snapshot_add_output(&session->snapshot, new_output);
2720 if (id) {
2721 *id = new_output->id;
2722 }
2723 rcu_read_unlock();
2724
2725 return LTTNG_OK;
2726
2727 free_error:
2728 snapshot_output_destroy(new_output);
2729 error:
2730 return ret;
2731 }
2732
2733 /*
2734 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2735 *
2736 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2737 */
2738 int cmd_snapshot_del_output(struct ltt_session *session,
2739 struct lttng_snapshot_output *output)
2740 {
2741 int ret;
2742 struct snapshot_output *sout = NULL;
2743
2744 assert(session);
2745 assert(output);
2746
2747 rcu_read_lock();
2748
2749 /*
2750 * Permission denied to create an output if the session is not
2751 * set in no output mode.
2752 */
2753 if (session->output_traces) {
2754 ret = LTTNG_ERR_EPERM;
2755 goto error;
2756 }
2757
2758 if (output->id) {
2759 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2760 session->name);
2761 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2762 } else if (*output->name != '\0') {
2763 DBG("Cmd snapshot del output name %s for session %s", output->name,
2764 session->name);
2765 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2766 }
2767 if (!sout) {
2768 ret = LTTNG_ERR_INVALID;
2769 goto error;
2770 }
2771
2772 snapshot_delete_output(&session->snapshot, sout);
2773 snapshot_output_destroy(sout);
2774 ret = LTTNG_OK;
2775
2776 error:
2777 rcu_read_unlock();
2778 return ret;
2779 }
2780
2781 /*
2782 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2783 *
2784 * If no output is available, outputs is untouched and 0 is returned.
2785 *
2786 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2787 */
2788 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2789 struct lttng_snapshot_output **outputs)
2790 {
2791 int ret, idx = 0;
2792 struct lttng_snapshot_output *list = NULL;
2793 struct lttng_ht_iter iter;
2794 struct snapshot_output *output;
2795
2796 assert(session);
2797 assert(outputs);
2798
2799 DBG("Cmd snapshot list outputs for session %s", session->name);
2800
2801 /*
2802 * Permission denied to create an output if the session is not
2803 * set in no output mode.
2804 */
2805 if (session->output_traces) {
2806 ret = -LTTNG_ERR_EPERM;
2807 goto error;
2808 }
2809
2810 if (session->snapshot.nb_output == 0) {
2811 ret = 0;
2812 goto error;
2813 }
2814
2815 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2816 if (!list) {
2817 ret = -LTTNG_ERR_NOMEM;
2818 goto error;
2819 }
2820
2821 /* Copy list from session to the new list object. */
2822 rcu_read_lock();
2823 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2824 output, node.node) {
2825 assert(output->consumer);
2826 list[idx].id = output->id;
2827 list[idx].max_size = output->max_size;
2828 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2829 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2830 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2831 sizeof(list[idx].ctrl_url));
2832 } else {
2833 /* Control URI. */
2834 ret = uri_to_str_url(&output->consumer->dst.net.control,
2835 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2836 if (ret < 0) {
2837 ret = -LTTNG_ERR_NOMEM;
2838 goto error;
2839 }
2840
2841 /* Data URI. */
2842 ret = uri_to_str_url(&output->consumer->dst.net.data,
2843 list[idx].data_url, sizeof(list[idx].data_url));
2844 if (ret < 0) {
2845 ret = -LTTNG_ERR_NOMEM;
2846 goto error;
2847 }
2848 }
2849 idx++;
2850 }
2851
2852 *outputs = list;
2853 list = NULL;
2854 ret = session->snapshot.nb_output;
2855 error:
2856 free(list);
2857 rcu_read_unlock();
2858 return ret;
2859 }
2860
2861 /*
2862 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2863 * snapshot output is *not* set with a remote destination.
2864 *
2865 * Return 0 on success or a LTTNG_ERR code.
2866 */
2867 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2868 struct snapshot_output *snap_output, struct ltt_session *session)
2869 {
2870 int ret = LTTNG_OK;
2871 struct lttng_ht_iter iter;
2872 struct consumer_socket *socket;
2873
2874 assert(consumer);
2875 assert(snap_output);
2876 assert(session);
2877
2878 DBG2("Set relayd object from snapshot output");
2879
2880 /* Ignore if snapshot consumer output is not network. */
2881 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2882 goto error;
2883 }
2884
2885 /*
2886 * For each consumer socket, create and send the relayd object of the
2887 * snapshot output.
2888 */
2889 rcu_read_lock();
2890 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2891 socket, node.node) {
2892 ret = send_consumer_relayd_sockets(0, session->id,
2893 snap_output->consumer, socket,
2894 session->name, session->hostname,
2895 session->live_timer);
2896 if (ret != LTTNG_OK) {
2897 rcu_read_unlock();
2898 goto error;
2899 }
2900 }
2901 rcu_read_unlock();
2902
2903 error:
2904 return ret;
2905 }
2906
2907 /*
2908 * Record a kernel snapshot.
2909 *
2910 * Return LTTNG_OK on success or a LTTNG_ERR code.
2911 */
2912 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2913 struct snapshot_output *output, struct ltt_session *session,
2914 int wait, uint64_t max_stream_size)
2915 {
2916 int ret;
2917
2918 assert(ksess);
2919 assert(output);
2920 assert(session);
2921
2922 /* Get the datetime for the snapshot output directory. */
2923 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2924 sizeof(output->datetime));
2925 if (!ret) {
2926 ret = LTTNG_ERR_INVALID;
2927 goto error;
2928 }
2929
2930 /*
2931 * Copy kernel session sockets so we can communicate with the right
2932 * consumer for the snapshot record command.
2933 */
2934 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2935 if (ret < 0) {
2936 ret = LTTNG_ERR_NOMEM;
2937 goto error;
2938 }
2939
2940 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2941 if (ret != LTTNG_OK) {
2942 goto error_snapshot;
2943 }
2944
2945 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2946 if (ret != LTTNG_OK) {
2947 goto error_snapshot;
2948 }
2949
2950 ret = LTTNG_OK;
2951
2952 error_snapshot:
2953 /* Clean up copied sockets so this output can use some other later on. */
2954 consumer_destroy_output_sockets(output->consumer);
2955 error:
2956 return ret;
2957 }
2958
2959 /*
2960 * Record a UST snapshot.
2961 *
2962 * Return 0 on success or a LTTNG_ERR error code.
2963 */
2964 static int record_ust_snapshot(struct ltt_ust_session *usess,
2965 struct snapshot_output *output, struct ltt_session *session,
2966 int wait, uint64_t max_stream_size)
2967 {
2968 int ret;
2969
2970 assert(usess);
2971 assert(output);
2972 assert(session);
2973
2974 /* Get the datetime for the snapshot output directory. */
2975 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2976 sizeof(output->datetime));
2977 if (!ret) {
2978 ret = LTTNG_ERR_INVALID;
2979 goto error;
2980 }
2981
2982 /*
2983 * Copy UST session sockets so we can communicate with the right
2984 * consumer for the snapshot record command.
2985 */
2986 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2987 if (ret < 0) {
2988 ret = LTTNG_ERR_NOMEM;
2989 goto error;
2990 }
2991
2992 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2993 if (ret != LTTNG_OK) {
2994 goto error_snapshot;
2995 }
2996
2997 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
2998 if (ret < 0) {
2999 switch (-ret) {
3000 case EINVAL:
3001 ret = LTTNG_ERR_INVALID;
3002 break;
3003 case ENODATA:
3004 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3005 break;
3006 default:
3007 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3008 break;
3009 }
3010 goto error_snapshot;
3011 }
3012
3013 ret = LTTNG_OK;
3014
3015 error_snapshot:
3016 /* Clean up copied sockets so this output can use some other later on. */
3017 consumer_destroy_output_sockets(output->consumer);
3018 error:
3019 return ret;
3020 }
3021
3022 /*
3023 * Return the biggest subbuffer size of all channels in the given session.
3024 */
3025 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
3026 {
3027 uint64_t max_size = 0;
3028
3029 assert(session);
3030
3031 if (session->kernel_session) {
3032 struct ltt_kernel_channel *chan;
3033 struct ltt_kernel_session *ksess = session->kernel_session;
3034
3035 /*
3036 * For each channel, add to the max size the size of each subbuffer
3037 * multiplied by their sized.
3038 */
3039 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3040 if (chan->channel->attr.subbuf_size > max_size) {
3041 max_size = chan->channel->attr.subbuf_size;
3042 }
3043 }
3044 }
3045
3046 if (session->ust_session) {
3047 struct lttng_ht_iter iter;
3048 struct ltt_ust_channel *uchan;
3049 struct ltt_ust_session *usess = session->ust_session;
3050
3051 rcu_read_lock();
3052 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
3053 uchan, node.node) {
3054 if (uchan->attr.subbuf_size > max_size) {
3055 max_size = uchan->attr.subbuf_size;
3056 }
3057 }
3058 rcu_read_unlock();
3059 }
3060
3061 return max_size;
3062 }
3063
3064 /*
3065 * Returns the total number of streams for a session or a negative value
3066 * on error.
3067 */
3068 static unsigned int get_session_nb_streams(struct ltt_session *session)
3069 {
3070 unsigned int total_streams = 0;
3071
3072 if (session->kernel_session) {
3073 struct ltt_kernel_session *ksess = session->kernel_session;
3074
3075 total_streams += ksess->stream_count_global;
3076 }
3077
3078 if (session->ust_session) {
3079 struct ltt_ust_session *usess = session->ust_session;
3080
3081 total_streams += ust_app_get_nb_stream(usess);
3082 }
3083
3084 return total_streams;
3085 }
3086
3087 /*
3088 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3089 *
3090 * The wait parameter is ignored so this call always wait for the snapshot to
3091 * complete before returning.
3092 *
3093 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3094 */
3095 int cmd_snapshot_record(struct ltt_session *session,
3096 struct lttng_snapshot_output *output, int wait)
3097 {
3098 int ret = LTTNG_OK;
3099 unsigned int use_tmp_output = 0;
3100 struct snapshot_output tmp_output;
3101 unsigned int nb_streams, snapshot_success = 0;
3102 uint64_t session_max_size = 0, max_stream_size = 0;
3103
3104 assert(session);
3105 assert(output);
3106
3107 DBG("Cmd snapshot record for session %s", session->name);
3108
3109 /*
3110 * Permission denied to create an output if the session is not
3111 * set in no output mode.
3112 */
3113 if (session->output_traces) {
3114 ret = LTTNG_ERR_EPERM;
3115 goto error;
3116 }
3117
3118 /* The session needs to be started at least once. */
3119 if (!session->has_been_started) {
3120 ret = LTTNG_ERR_START_SESSION_ONCE;
3121 goto error;
3122 }
3123
3124 /* Use temporary output for the session. */
3125 if (*output->ctrl_url != '\0') {
3126 ret = snapshot_output_init(output->max_size, output->name,
3127 output->ctrl_url, output->data_url, session->consumer,
3128 &tmp_output, NULL);
3129 if (ret < 0) {
3130 if (ret == -ENOMEM) {
3131 ret = LTTNG_ERR_NOMEM;
3132 } else {
3133 ret = LTTNG_ERR_INVALID;
3134 }
3135 goto error;
3136 }
3137 /* Use the global session count for the temporary snapshot. */
3138 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3139 use_tmp_output = 1;
3140 }
3141
3142 /*
3143 * Get the session maximum size for a snapshot meaning it will compute the
3144 * size of all streams from all domain.
3145 */
3146 max_stream_size = get_session_max_subbuf_size(session);
3147
3148 nb_streams = get_session_nb_streams(session);
3149 if (nb_streams) {
3150 /*
3151 * The maximum size of the snapshot is the number of streams multiplied
3152 * by the biggest subbuf size of all channels in a session which is the
3153 * maximum stream size available for each stream. The session max size
3154 * is now checked against the snapshot max size value given by the user
3155 * and if lower, an error is returned.
3156 */
3157 session_max_size = max_stream_size * nb_streams;
3158 }
3159
3160 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3161 session_max_size, max_stream_size);
3162
3163 /*
3164 * If we use a temporary output, check right away if the max size fits else
3165 * for each output the max size will be checked.
3166 */
3167 if (use_tmp_output &&
3168 (tmp_output.max_size != 0 &&
3169 tmp_output.max_size < session_max_size)) {
3170 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3171 goto error;
3172 }
3173
3174 if (session->kernel_session) {
3175 struct ltt_kernel_session *ksess = session->kernel_session;
3176
3177 if (use_tmp_output) {
3178 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3179 wait, max_stream_size);
3180 if (ret != LTTNG_OK) {
3181 goto error;
3182 }
3183 snapshot_success = 1;
3184 } else {
3185 struct snapshot_output *sout;
3186 struct lttng_ht_iter iter;
3187
3188 rcu_read_lock();
3189 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3190 &iter.iter, sout, node.node) {
3191 /*
3192 * Make a local copy of the output and assign the possible
3193 * temporary value given by the caller.
3194 */
3195 memset(&tmp_output, 0, sizeof(tmp_output));
3196 memcpy(&tmp_output, sout, sizeof(tmp_output));
3197
3198 /* Use temporary max size. */
3199 if (output->max_size != (uint64_t) -1ULL) {
3200 tmp_output.max_size = output->max_size;
3201 }
3202
3203 if (tmp_output.max_size != 0 &&
3204 tmp_output.max_size < session_max_size) {
3205 rcu_read_unlock();
3206 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3207 goto error;
3208 }
3209
3210 /* Use temporary name. */
3211 if (*output->name != '\0') {
3212 strncpy(tmp_output.name, output->name,
3213 sizeof(tmp_output.name));
3214 }
3215
3216 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3217
3218 ret = record_kernel_snapshot(ksess, &tmp_output,
3219 session, wait, max_stream_size);
3220 if (ret != LTTNG_OK) {
3221 rcu_read_unlock();
3222 goto error;
3223 }
3224 snapshot_success = 1;
3225 }
3226 rcu_read_unlock();
3227 }
3228 }
3229
3230 if (session->ust_session) {
3231 struct ltt_ust_session *usess = session->ust_session;
3232
3233 if (use_tmp_output) {
3234 ret = record_ust_snapshot(usess, &tmp_output, session,
3235 wait, max_stream_size);
3236 if (ret != LTTNG_OK) {
3237 goto error;
3238 }
3239 snapshot_success = 1;
3240 } else {
3241 struct snapshot_output *sout;
3242 struct lttng_ht_iter iter;
3243
3244 rcu_read_lock();
3245 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3246 &iter.iter, sout, node.node) {
3247 /*
3248 * Make a local copy of the output and assign the possible
3249 * temporary value given by the caller.
3250 */
3251 memset(&tmp_output, 0, sizeof(tmp_output));
3252 memcpy(&tmp_output, sout, sizeof(tmp_output));
3253
3254 /* Use temporary max size. */
3255 if (output->max_size != (uint64_t) -1ULL) {
3256 tmp_output.max_size = output->max_size;
3257 }
3258
3259 if (tmp_output.max_size != 0 &&
3260 tmp_output.max_size < session_max_size) {
3261 rcu_read_unlock();
3262 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3263 goto error;
3264 }
3265
3266 /* Use temporary name. */
3267 if (*output->name != '\0') {
3268 strncpy(tmp_output.name, output->name,
3269 sizeof(tmp_output.name));
3270 }
3271
3272 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3273
3274 ret = record_ust_snapshot(usess, &tmp_output, session,
3275 wait, max_stream_size);
3276 if (ret != LTTNG_OK) {
3277 rcu_read_unlock();
3278 goto error;
3279 }
3280 snapshot_success = 1;
3281 }
3282 rcu_read_unlock();
3283 }
3284 }
3285
3286 if (snapshot_success) {
3287 session->snapshot.nb_snapshot++;
3288 } else {
3289 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3290 }
3291
3292 error:
3293 return ret;
3294 }
3295
3296 /*
3297 * Init command subsystem.
3298 */
3299 void cmd_init(void)
3300 {
3301 /*
3302 * Set network sequence index to 1 for streams to match a relayd
3303 * socket on the consumer side.
3304 */
3305 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3306 relayd_net_seq_idx = 1;
3307 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3308
3309 DBG("Command subsystem initialized");
3310 }
LTTng 2.0 tools and control repository
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