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