projects / lttng-tools.git / blob
? search:


0050ef50b1169c9b3b16545aee2c8e48e950ccfc
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <inttypes.h>
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
23
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
29
30 #include "channel.h"
31 #include "consumer.h"
32 #include "event.h"
33 #include "health-sessiond.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38
39 #include "cmd.h"
40
41 /*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
46 */
47 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48 static uint64_t relayd_net_seq_idx;
49
50 /*
51 * Both functions below are special case for the Kernel domain when
52 * enabling/disabling all events.
53 */
54 static
55 int enable_kevent_all(struct ltt_session *session,
56 struct lttng_domain *domain, char *channel_name,
57 struct lttng_event *event,
58 char *filter_expression,
59 struct lttng_filter_bytecode *filter, int wpipe);
60 static
61 int disable_kevent_all(struct ltt_session *session, int domain,
62 char *channel_name,
63 struct lttng_event *event);
64
65 /*
66 * Create a session path used by list_lttng_sessions for the case that the
67 * session consumer is on the network.
68 */
69 static int build_network_session_path(char *dst, size_t size,
70 struct ltt_session *session)
71 {
72 int ret, kdata_port, udata_port;
73 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
74 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
75
76 assert(session);
77 assert(dst);
78
79 memset(tmp_urls, 0, sizeof(tmp_urls));
80 memset(tmp_uurl, 0, sizeof(tmp_uurl));
81
82 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
83
84 if (session->kernel_session && session->kernel_session->consumer) {
85 kuri = &session->kernel_session->consumer->dst.net.control;
86 kdata_port = session->kernel_session->consumer->dst.net.data.port;
87 }
88
89 if (session->ust_session && session->ust_session->consumer) {
90 uuri = &session->ust_session->consumer->dst.net.control;
91 udata_port = session->ust_session->consumer->dst.net.data.port;
92 }
93
94 if (uuri == NULL && kuri == NULL) {
95 uri = &session->consumer->dst.net.control;
96 kdata_port = session->consumer->dst.net.data.port;
97 } else if (kuri && uuri) {
98 ret = uri_compare(kuri, uuri);
99 if (ret) {
100 /* Not Equal */
101 uri = kuri;
102 /* Build uuri URL string */
103 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
104 if (ret < 0) {
105 goto error;
106 }
107 } else {
108 uri = kuri;
109 }
110 } else if (kuri && uuri == NULL) {
111 uri = kuri;
112 } else if (uuri && kuri == NULL) {
113 uri = uuri;
114 }
115
116 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
117 if (ret < 0) {
118 goto error;
119 }
120
121 /*
122 * Do we have a UST url set. If yes, this means we have both kernel and UST
123 * to print.
124 */
125 if (*tmp_uurl != '\0') {
126 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
127 tmp_urls, kdata_port, tmp_uurl, udata_port);
128 } else {
129 int dport;
130 if (kuri || (!kuri && !uuri)) {
131 dport = kdata_port;
132 } else {
133 /* No kernel URI, use the UST port. */
134 dport = udata_port;
135 }
136 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
137 }
138
139 error:
140 return ret;
141 }
142
143 /*
144 * Fill lttng_channel array of all channels.
145 */
146 static void list_lttng_channels(int domain, struct ltt_session *session,
147 struct lttng_channel *channels)
148 {
149 int i = 0;
150 struct ltt_kernel_channel *kchan;
151
152 DBG("Listing channels for session %s", session->name);
153
154 switch (domain) {
155 case LTTNG_DOMAIN_KERNEL:
156 /* Kernel channels */
157 if (session->kernel_session != NULL) {
158 cds_list_for_each_entry(kchan,
159 &session->kernel_session->channel_list.head, list) {
160 /* Copy lttng_channel struct to array */
161 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
162 channels[i].enabled = kchan->enabled;
163 i++;
164 }
165 }
166 break;
167 case LTTNG_DOMAIN_UST:
168 {
169 struct lttng_ht_iter iter;
170 struct ltt_ust_channel *uchan;
171
172 rcu_read_lock();
173 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
174 &iter.iter, uchan, node.node) {
175 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
176 channels[i].attr.overwrite = uchan->attr.overwrite;
177 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
178 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
179 channels[i].attr.switch_timer_interval =
180 uchan->attr.switch_timer_interval;
181 channels[i].attr.read_timer_interval =
182 uchan->attr.read_timer_interval;
183 channels[i].enabled = uchan->enabled;
184 channels[i].attr.tracefile_size = uchan->tracefile_size;
185 channels[i].attr.tracefile_count = uchan->tracefile_count;
186 switch (uchan->attr.output) {
187 case LTTNG_UST_MMAP:
188 default:
189 channels[i].attr.output = LTTNG_EVENT_MMAP;
190 break;
191 }
192 i++;
193 }
194 rcu_read_unlock();
195 break;
196 }
197 default:
198 break;
199 }
200 }
201
202 /*
203 * Create a list of agent domain events.
204 *
205 * Return number of events in list on success or else a negative value.
206 */
207 static int list_lttng_agent_events(struct agent *agt,
208 struct lttng_event **events)
209 {
210 int i = 0, ret = 0;
211 unsigned int nb_event = 0;
212 struct agent_event *event;
213 struct lttng_event *tmp_events;
214 struct lttng_ht_iter iter;
215
216 assert(agt);
217 assert(events);
218
219 DBG3("Listing agent events");
220
221 nb_event = lttng_ht_get_count(agt->events);
222 if (nb_event == 0) {
223 ret = nb_event;
224 goto error;
225 }
226
227 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
228 if (!tmp_events) {
229 PERROR("zmalloc agent events session");
230 ret = -LTTNG_ERR_FATAL;
231 goto error;
232 }
233
234 rcu_read_lock();
235 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
236 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
237 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
238 tmp_events[i].enabled = event->enabled;
239 tmp_events[i].loglevel = event->loglevel;
240 tmp_events[i].loglevel_type = event->loglevel_type;
241 i++;
242 }
243 rcu_read_unlock();
244
245 *events = tmp_events;
246 ret = nb_event;
247
248 error:
249 assert(nb_event == i);
250 return ret;
251 }
252
253 /*
254 * Create a list of ust global domain events.
255 */
256 static int list_lttng_ust_global_events(char *channel_name,
257 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
258 {
259 int i = 0, ret = 0;
260 unsigned int nb_event = 0;
261 struct lttng_ht_iter iter;
262 struct lttng_ht_node_str *node;
263 struct ltt_ust_channel *uchan;
264 struct ltt_ust_event *uevent;
265 struct lttng_event *tmp;
266
267 DBG("Listing UST global events for channel %s", channel_name);
268
269 rcu_read_lock();
270
271 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
272 node = lttng_ht_iter_get_node_str(&iter);
273 if (node == NULL) {
274 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
275 goto error;
276 }
277
278 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
279
280 nb_event += lttng_ht_get_count(uchan->events);
281
282 if (nb_event == 0) {
283 ret = nb_event;
284 goto error;
285 }
286
287 DBG3("Listing UST global %d events", nb_event);
288
289 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
290 if (tmp == NULL) {
291 ret = LTTNG_ERR_FATAL;
292 goto error;
293 }
294
295 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
296 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
297 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
298 tmp[i].enabled = uevent->enabled;
299
300 switch (uevent->attr.instrumentation) {
301 case LTTNG_UST_TRACEPOINT:
302 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
303 break;
304 case LTTNG_UST_PROBE:
305 tmp[i].type = LTTNG_EVENT_PROBE;
306 break;
307 case LTTNG_UST_FUNCTION:
308 tmp[i].type = LTTNG_EVENT_FUNCTION;
309 break;
310 }
311
312 tmp[i].loglevel = uevent->attr.loglevel;
313 switch (uevent->attr.loglevel_type) {
314 case LTTNG_UST_LOGLEVEL_ALL:
315 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
316 break;
317 case LTTNG_UST_LOGLEVEL_RANGE:
318 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
319 break;
320 case LTTNG_UST_LOGLEVEL_SINGLE:
321 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
322 break;
323 }
324 if (uevent->filter) {
325 tmp[i].filter = 1;
326 }
327 if (uevent->exclusion) {
328 tmp[i].exclusion = 1;
329 }
330 i++;
331 }
332
333 ret = nb_event;
334 *events = tmp;
335
336 error:
337 rcu_read_unlock();
338 return ret;
339 }
340
341 /*
342 * Fill lttng_event array of all kernel events in the channel.
343 */
344 static int list_lttng_kernel_events(char *channel_name,
345 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
346 {
347 int i = 0, ret;
348 unsigned int nb_event;
349 struct ltt_kernel_event *event;
350 struct ltt_kernel_channel *kchan;
351
352 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
353 if (kchan == NULL) {
354 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
355 goto error;
356 }
357
358 nb_event = kchan->event_count;
359
360 DBG("Listing events for channel %s", kchan->channel->name);
361
362 if (nb_event == 0) {
363 goto end;
364 }
365
366 *events = zmalloc(nb_event * sizeof(struct lttng_event));
367 if (*events == NULL) {
368 ret = LTTNG_ERR_FATAL;
369 goto error;
370 }
371
372 /* Kernel channels */
373 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
374 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
375 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
376 (*events)[i].enabled = event->enabled;
377
378 switch (event->event->instrumentation) {
379 case LTTNG_KERNEL_TRACEPOINT:
380 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
381 break;
382 case LTTNG_KERNEL_KRETPROBE:
383 (*events)[i].type = LTTNG_EVENT_FUNCTION;
384 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
385 sizeof(struct lttng_kernel_kprobe));
386 break;
387 case LTTNG_KERNEL_KPROBE:
388 (*events)[i].type = LTTNG_EVENT_PROBE;
389 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
390 sizeof(struct lttng_kernel_kprobe));
391 break;
392 case LTTNG_KERNEL_FUNCTION:
393 (*events)[i].type = LTTNG_EVENT_FUNCTION;
394 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
395 sizeof(struct lttng_kernel_function));
396 break;
397 case LTTNG_KERNEL_NOOP:
398 (*events)[i].type = LTTNG_EVENT_NOOP;
399 break;
400 case LTTNG_KERNEL_SYSCALL:
401 (*events)[i].type = LTTNG_EVENT_SYSCALL;
402 break;
403 case LTTNG_KERNEL_ALL:
404 assert(0);
405 break;
406 }
407 i++;
408 }
409
410 end:
411 return nb_event;
412
413 error:
414 /* Negate the error code to differentiate the size from an error */
415 return -ret;
416 }
417
418 /*
419 * Add URI so the consumer output object. Set the correct path depending on the
420 * domain adding the default trace directory.
421 */
422 static int add_uri_to_consumer(struct consumer_output *consumer,
423 struct lttng_uri *uri, int domain, const char *session_name)
424 {
425 int ret = LTTNG_OK;
426 const char *default_trace_dir;
427
428 assert(uri);
429
430 if (consumer == NULL) {
431 DBG("No consumer detected. Don't add URI. Stopping.");
432 ret = LTTNG_ERR_NO_CONSUMER;
433 goto error;
434 }
435
436 switch (domain) {
437 case LTTNG_DOMAIN_KERNEL:
438 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
439 break;
440 case LTTNG_DOMAIN_UST:
441 default_trace_dir = DEFAULT_UST_TRACE_DIR;
442 break;
443 default:
444 /*
445 * This case is possible is we try to add the URI to the global tracing
446 * session consumer object which in this case there is no subdir.
447 */
448 default_trace_dir = "";
449 }
450
451 switch (uri->dtype) {
452 case LTTNG_DST_IPV4:
453 case LTTNG_DST_IPV6:
454 DBG2("Setting network URI to consumer");
455
456 if (consumer->type == CONSUMER_DST_NET) {
457 if ((uri->stype == LTTNG_STREAM_CONTROL &&
458 consumer->dst.net.control_isset) ||
459 (uri->stype == LTTNG_STREAM_DATA &&
460 consumer->dst.net.data_isset)) {
461 ret = LTTNG_ERR_URL_EXIST;
462 goto error;
463 }
464 } else {
465 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
466 }
467
468 consumer->type = CONSUMER_DST_NET;
469
470 /* Set URI into consumer output object */
471 ret = consumer_set_network_uri(consumer, uri);
472 if (ret < 0) {
473 ret = -ret;
474 goto error;
475 } else if (ret == 1) {
476 /*
477 * URI was the same in the consumer so we do not append the subdir
478 * again so to not duplicate output dir.
479 */
480 ret = LTTNG_OK;
481 goto error;
482 }
483
484 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
485 ret = consumer_set_subdir(consumer, session_name);
486 if (ret < 0) {
487 ret = LTTNG_ERR_FATAL;
488 goto error;
489 }
490 }
491
492 if (uri->stype == LTTNG_STREAM_CONTROL) {
493 /* On a new subdir, reappend the default trace dir. */
494 strncat(consumer->subdir, default_trace_dir,
495 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
496 DBG3("Append domain trace name to subdir %s", consumer->subdir);
497 }
498
499 break;
500 case LTTNG_DST_PATH:
501 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
502 memset(consumer->dst.trace_path, 0,
503 sizeof(consumer->dst.trace_path));
504 strncpy(consumer->dst.trace_path, uri->dst.path,
505 sizeof(consumer->dst.trace_path));
506 /* Append default trace dir */
507 strncat(consumer->dst.trace_path, default_trace_dir,
508 sizeof(consumer->dst.trace_path) -
509 strlen(consumer->dst.trace_path) - 1);
510 /* Flag consumer as local. */
511 consumer->type = CONSUMER_DST_LOCAL;
512 break;
513 }
514
515 ret = LTTNG_OK;
516
517 error:
518 return ret;
519 }
520
521 /*
522 * Init tracing by creating trace directory and sending fds kernel consumer.
523 */
524 static int init_kernel_tracing(struct ltt_kernel_session *session)
525 {
526 int ret = 0;
527 struct lttng_ht_iter iter;
528 struct consumer_socket *socket;
529
530 assert(session);
531
532 rcu_read_lock();
533
534 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
535 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
536 socket, node.node) {
537 pthread_mutex_lock(socket->lock);
538 ret = kernel_consumer_send_session(socket, session);
539 pthread_mutex_unlock(socket->lock);
540 if (ret < 0) {
541 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
542 goto error;
543 }
544 }
545 }
546
547 error:
548 rcu_read_unlock();
549 return ret;
550 }
551
552 /*
553 * Create a socket to the relayd using the URI.
554 *
555 * On success, the relayd_sock pointer is set to the created socket.
556 * Else, it's stays untouched and a lttcomm error code is returned.
557 */
558 static int create_connect_relayd(struct lttng_uri *uri,
559 struct lttcomm_relayd_sock **relayd_sock)
560 {
561 int ret;
562 struct lttcomm_relayd_sock *rsock;
563
564 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
565 RELAYD_VERSION_COMM_MINOR);
566 if (!rsock) {
567 ret = LTTNG_ERR_FATAL;
568 goto error;
569 }
570
571 /*
572 * Connect to relayd so we can proceed with a session creation. This call
573 * can possibly block for an arbitrary amount of time to set the health
574 * state to be in poll execution.
575 */
576 health_poll_entry();
577 ret = relayd_connect(rsock);
578 health_poll_exit();
579 if (ret < 0) {
580 ERR("Unable to reach lttng-relayd");
581 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
582 goto free_sock;
583 }
584
585 /* Create socket for control stream. */
586 if (uri->stype == LTTNG_STREAM_CONTROL) {
587 DBG3("Creating relayd stream socket from URI");
588
589 /* Check relayd version */
590 ret = relayd_version_check(rsock);
591 if (ret < 0) {
592 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
593 goto close_sock;
594 }
595 } else if (uri->stype == LTTNG_STREAM_DATA) {
596 DBG3("Creating relayd data socket from URI");
597 } else {
598 /* Command is not valid */
599 ERR("Relayd invalid stream type: %d", uri->stype);
600 ret = LTTNG_ERR_INVALID;
601 goto close_sock;
602 }
603
604 *relayd_sock = rsock;
605
606 return LTTNG_OK;
607
608 close_sock:
609 /* The returned value is not useful since we are on an error path. */
610 (void) relayd_close(rsock);
611 free_sock:
612 free(rsock);
613 error:
614 return ret;
615 }
616
617 /*
618 * Connect to the relayd using URI and send the socket to the right consumer.
619 */
620 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
621 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
622 struct consumer_socket *consumer_sock,
623 char *session_name, char *hostname, int session_live_timer)
624 {
625 int ret;
626 struct lttcomm_relayd_sock *rsock = NULL;
627
628 /* Connect to relayd and make version check if uri is the control. */
629 ret = create_connect_relayd(relayd_uri, &rsock);
630 if (ret != LTTNG_OK) {
631 goto error;
632 }
633 assert(rsock);
634
635 /* Set the network sequence index if not set. */
636 if (consumer->net_seq_index == (uint64_t) -1ULL) {
637 pthread_mutex_lock(&relayd_net_seq_idx_lock);
638 /*
639 * Increment net_seq_idx because we are about to transfer the
640 * new relayd socket to the consumer.
641 * Assign unique key so the consumer can match streams.
642 */
643 consumer->net_seq_index = ++relayd_net_seq_idx;
644 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
645 }
646
647 /* Send relayd socket to consumer. */
648 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
649 relayd_uri->stype, session_id,
650 session_name, hostname, session_live_timer);
651 if (ret < 0) {
652 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
653 goto close_sock;
654 }
655
656 /* Flag that the corresponding socket was sent. */
657 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
658 consumer_sock->control_sock_sent = 1;
659 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
660 consumer_sock->data_sock_sent = 1;
661 }
662
663 ret = LTTNG_OK;
664
665 /*
666 * Close socket which was dup on the consumer side. The session daemon does
667 * NOT keep track of the relayd socket(s) once transfer to the consumer.
668 */
669
670 close_sock:
671 (void) relayd_close(rsock);
672 free(rsock);
673
674 error:
675 if (ret != LTTNG_OK) {
676 /*
677 * The consumer output for this session should not be used anymore
678 * since the relayd connection failed thus making any tracing or/and
679 * streaming not usable.
680 */
681 consumer->enabled = 0;
682 }
683 return ret;
684 }
685
686 /*
687 * Send both relayd sockets to a specific consumer and domain. This is a
688 * helper function to facilitate sending the information to the consumer for a
689 * session.
690 */
691 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
692 struct consumer_output *consumer, struct consumer_socket *sock,
693 char *session_name, char *hostname, int session_live_timer)
694 {
695 int ret = LTTNG_OK;
696
697 assert(consumer);
698 assert(sock);
699
700 /* Sending control relayd socket. */
701 if (!sock->control_sock_sent) {
702 ret = send_consumer_relayd_socket(domain, session_id,
703 &consumer->dst.net.control, consumer, sock,
704 session_name, hostname, session_live_timer);
705 if (ret != LTTNG_OK) {
706 goto error;
707 }
708 }
709
710 /* Sending data relayd socket. */
711 if (!sock->data_sock_sent) {
712 ret = send_consumer_relayd_socket(domain, session_id,
713 &consumer->dst.net.data, consumer, sock,
714 session_name, hostname, session_live_timer);
715 if (ret != LTTNG_OK) {
716 goto error;
717 }
718 }
719
720 error:
721 return ret;
722 }
723
724 /*
725 * Setup relayd connections for a tracing session. First creates the socket to
726 * the relayd and send them to the right domain consumer. Consumer type MUST be
727 * network.
728 */
729 int cmd_setup_relayd(struct ltt_session *session)
730 {
731 int ret = LTTNG_OK;
732 struct ltt_ust_session *usess;
733 struct ltt_kernel_session *ksess;
734 struct consumer_socket *socket;
735 struct lttng_ht_iter iter;
736
737 assert(session);
738
739 usess = session->ust_session;
740 ksess = session->kernel_session;
741
742 DBG("Setting relayd for session %s", session->name);
743
744 rcu_read_lock();
745
746 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
747 && usess->consumer->enabled) {
748 /* For each consumer socket, send relayd sockets */
749 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
750 socket, node.node) {
751 pthread_mutex_lock(socket->lock);
752 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
753 usess->consumer, socket,
754 session->name, session->hostname,
755 session->live_timer);
756 pthread_mutex_unlock(socket->lock);
757 if (ret != LTTNG_OK) {
758 goto error;
759 }
760 /* Session is now ready for network streaming. */
761 session->net_handle = 1;
762 }
763 }
764
765 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
766 && ksess->consumer->enabled) {
767 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
768 socket, node.node) {
769 pthread_mutex_lock(socket->lock);
770 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
771 ksess->consumer, socket,
772 session->name, session->hostname,
773 session->live_timer);
774 pthread_mutex_unlock(socket->lock);
775 if (ret != LTTNG_OK) {
776 goto error;
777 }
778 /* Session is now ready for network streaming. */
779 session->net_handle = 1;
780 }
781 }
782
783 error:
784 rcu_read_unlock();
785 return ret;
786 }
787
788 /*
789 * Start a kernel session by opening all necessary streams.
790 */
791 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
792 {
793 int ret;
794 struct ltt_kernel_channel *kchan;
795
796 /* Open kernel metadata */
797 if (ksess->metadata == NULL && ksess->output_traces) {
798 ret = kernel_open_metadata(ksess);
799 if (ret < 0) {
800 ret = LTTNG_ERR_KERN_META_FAIL;
801 goto error;
802 }
803 }
804
805 /* Open kernel metadata stream */
806 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
807 ret = kernel_open_metadata_stream(ksess);
808 if (ret < 0) {
809 ERR("Kernel create metadata stream failed");
810 ret = LTTNG_ERR_KERN_STREAM_FAIL;
811 goto error;
812 }
813 }
814
815 /* For each channel */
816 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
817 if (kchan->stream_count == 0) {
818 ret = kernel_open_channel_stream(kchan);
819 if (ret < 0) {
820 ret = LTTNG_ERR_KERN_STREAM_FAIL;
821 goto error;
822 }
823 /* Update the stream global counter */
824 ksess->stream_count_global += ret;
825 }
826 }
827
828 /* Setup kernel consumer socket and send fds to it */
829 ret = init_kernel_tracing(ksess);
830 if (ret != 0) {
831 ret = LTTNG_ERR_KERN_START_FAIL;
832 goto error;
833 }
834
835 /* This start the kernel tracing */
836 ret = kernel_start_session(ksess);
837 if (ret < 0) {
838 ret = LTTNG_ERR_KERN_START_FAIL;
839 goto error;
840 }
841
842 /* Quiescent wait after starting trace */
843 kernel_wait_quiescent(kernel_tracer_fd);
844
845 ksess->active = 1;
846
847 ret = LTTNG_OK;
848
849 error:
850 return ret;
851 }
852
853 /*
854 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
855 */
856 int cmd_disable_channel(struct ltt_session *session, int domain,
857 char *channel_name)
858 {
859 int ret;
860 struct ltt_ust_session *usess;
861
862 usess = session->ust_session;
863
864 rcu_read_lock();
865
866 switch (domain) {
867 case LTTNG_DOMAIN_KERNEL:
868 {
869 ret = channel_kernel_disable(session->kernel_session,
870 channel_name);
871 if (ret != LTTNG_OK) {
872 goto error;
873 }
874
875 kernel_wait_quiescent(kernel_tracer_fd);
876 break;
877 }
878 case LTTNG_DOMAIN_UST:
879 {
880 struct ltt_ust_channel *uchan;
881 struct lttng_ht *chan_ht;
882
883 chan_ht = usess->domain_global.channels;
884
885 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
886 if (uchan == NULL) {
887 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
888 goto error;
889 }
890
891 ret = channel_ust_disable(usess, uchan);
892 if (ret != LTTNG_OK) {
893 goto error;
894 }
895 break;
896 }
897 #if 0
898 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
899 case LTTNG_DOMAIN_UST_EXEC_NAME:
900 case LTTNG_DOMAIN_UST_PID:
901 #endif
902 default:
903 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
904 goto error;
905 }
906
907 ret = LTTNG_OK;
908
909 error:
910 rcu_read_unlock();
911 return ret;
912 }
913
914 /*
915 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
916 *
917 * The wpipe arguments is used as a notifier for the kernel thread.
918 */
919 int cmd_enable_channel(struct ltt_session *session,
920 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
921 {
922 int ret;
923 struct ltt_ust_session *usess = session->ust_session;
924 struct lttng_ht *chan_ht;
925
926 assert(session);
927 assert(attr);
928 assert(domain);
929
930 DBG("Enabling channel %s for session %s", attr->name, session->name);
931
932 rcu_read_lock();
933
934 /*
935 * Don't try to enable a channel if the session has been started at
936 * some point in time before. The tracer does not allow it.
937 */
938 if (session->has_been_started) {
939 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
940 goto error;
941 }
942
943 /*
944 * If the session is a live session, remove the switch timer, the
945 * live timer does the same thing but sends also synchronisation
946 * beacons for inactive streams.
947 */
948 if (session->live_timer > 0) {
949 attr->attr.live_timer_interval = session->live_timer;
950 attr->attr.switch_timer_interval = 0;
951 }
952
953 /*
954 * The ringbuffer (both in user space and kernel) behave badly in overwrite
955 * mode and with less than 2 subbuf so block it right away and send back an
956 * invalid attribute error.
957 */
958 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
959 ret = LTTNG_ERR_INVALID;
960 goto error;
961 }
962
963 switch (domain->type) {
964 case LTTNG_DOMAIN_KERNEL:
965 {
966 struct ltt_kernel_channel *kchan;
967
968 kchan = trace_kernel_get_channel_by_name(attr->name,
969 session->kernel_session);
970 if (kchan == NULL) {
971 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
972 if (attr->name[0] != '\0') {
973 session->kernel_session->has_non_default_channel = 1;
974 }
975 } else {
976 ret = channel_kernel_enable(session->kernel_session, kchan);
977 }
978
979 if (ret != LTTNG_OK) {
980 goto error;
981 }
982
983 kernel_wait_quiescent(kernel_tracer_fd);
984 break;
985 }
986 case LTTNG_DOMAIN_UST:
987 {
988 struct ltt_ust_channel *uchan;
989
990 chan_ht = usess->domain_global.channels;
991
992 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
993 if (uchan == NULL) {
994 ret = channel_ust_create(usess, attr, domain->buf_type);
995 if (attr->name[0] != '\0') {
996 usess->has_non_default_channel = 1;
997 }
998 } else {
999 ret = channel_ust_enable(usess, uchan);
1000 }
1001 break;
1002 }
1003 default:
1004 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1005 goto error;
1006 }
1007
1008 error:
1009 rcu_read_unlock();
1010 return ret;
1011 }
1012
1013
1014 /*
1015 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1016 */
1017 int cmd_disable_event(struct ltt_session *session, int domain,
1018 char *channel_name,
1019 struct lttng_event *event)
1020 {
1021 int ret;
1022 char *event_name;
1023
1024 DBG("Disable event command for event \'%s\'", event->name);
1025
1026 event_name = event->name;
1027
1028 if (event->loglevel_type || event->loglevel || event->enabled
1029 || event->pid || event->filter || event->exclusion) {
1030 return LTTNG_ERR_UNK;
1031 }
1032 /* Special handling for kernel domain all events. */
1033 if (domain == LTTNG_DOMAIN_KERNEL && !strcmp(event_name, "*")) {
1034 return disable_kevent_all(session, domain, channel_name, event);
1035 }
1036
1037 rcu_read_lock();
1038
1039 switch (domain) {
1040 case LTTNG_DOMAIN_KERNEL:
1041 {
1042 struct ltt_kernel_channel *kchan;
1043 struct ltt_kernel_session *ksess;
1044
1045 ksess = session->kernel_session;
1046
1047 /*
1048 * If a non-default channel has been created in the
1049 * session, explicitely require that -c chan_name needs
1050 * to be provided.
1051 */
1052 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1053 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1054 goto error;
1055 }
1056
1057 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1058 if (kchan == NULL) {
1059 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1060 goto error;
1061 }
1062
1063 switch (event->type) {
1064 case LTTNG_EVENT_ALL:
1065 case LTTNG_EVENT_TRACEPOINT:
1066 ret = event_kernel_disable_tracepoint(kchan, event_name);
1067 if (ret != LTTNG_OK) {
1068 goto error;
1069 }
1070 break;
1071 case LTTNG_EVENT_SYSCALL:
1072 ret = event_kernel_disable_syscall(kchan, event_name);
1073 if (ret != LTTNG_OK) {
1074 goto error;
1075 }
1076 break;
1077 default:
1078 ret = LTTNG_ERR_UNK;
1079 goto error;
1080 }
1081
1082 kernel_wait_quiescent(kernel_tracer_fd);
1083 break;
1084 }
1085 case LTTNG_DOMAIN_UST:
1086 {
1087 struct ltt_ust_channel *uchan;
1088 struct ltt_ust_session *usess;
1089
1090 usess = session->ust_session;
1091
1092 /*
1093 * If a non-default channel has been created in the
1094 * session, explicitely require that -c chan_name needs
1095 * to be provided.
1096 */
1097 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1098 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1099 goto error;
1100 }
1101
1102 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1103 channel_name);
1104 if (uchan == NULL) {
1105 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1106 goto error;
1107 }
1108
1109 switch (event->type) {
1110 case LTTNG_EVENT_ALL:
1111 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1112 if (ret != LTTNG_OK) {
1113 goto error;
1114 }
1115 break;
1116 default:
1117 ret = LTTNG_ERR_UNK;
1118 goto error;
1119 }
1120
1121 DBG3("Disable UST event %s in channel %s completed", event_name,
1122 channel_name);
1123 break;
1124 }
1125 case LTTNG_DOMAIN_LOG4J:
1126 case LTTNG_DOMAIN_JUL:
1127 {
1128 struct agent *agt;
1129 struct ltt_ust_session *usess = session->ust_session;
1130
1131 assert(usess);
1132
1133 switch (event->type) {
1134 case LTTNG_EVENT_ALL:
1135 break;
1136 default:
1137 ret = LTTNG_ERR_UNK;
1138 goto error;
1139 }
1140
1141 agt = trace_ust_find_agent(usess, domain);
1142 if (!agt) {
1143 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1144 goto error;
1145 }
1146 /* The wild card * means that everything should be disabled. */
1147 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1148 ret = event_agent_disable_all(usess, agt);
1149 } else {
1150 ret = event_agent_disable(usess, agt, event_name);
1151 }
1152 if (ret != LTTNG_OK) {
1153 goto error;
1154 }
1155
1156 break;
1157 }
1158 #if 0
1159 case LTTNG_DOMAIN_UST_EXEC_NAME:
1160 case LTTNG_DOMAIN_UST_PID:
1161 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1162 #endif
1163 default:
1164 ret = LTTNG_ERR_UND;
1165 goto error;
1166 }
1167
1168 ret = LTTNG_OK;
1169
1170 error:
1171 rcu_read_unlock();
1172 return ret;
1173 }
1174
1175 /*
1176 * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
1177 */
1178 static
1179 int disable_kevent_all(struct ltt_session *session, int domain,
1180 char *channel_name,
1181 struct lttng_event *event)
1182 {
1183 int ret;
1184
1185 rcu_read_lock();
1186
1187 switch (domain) {
1188 case LTTNG_DOMAIN_KERNEL:
1189 {
1190 struct ltt_kernel_session *ksess;
1191 struct ltt_kernel_channel *kchan;
1192
1193 ksess = session->kernel_session;
1194
1195 /*
1196 * If a non-default channel has been created in the
1197 * session, explicitely require that -c chan_name needs
1198 * to be provided.
1199 */
1200 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1201 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1202 goto error;
1203 }
1204
1205 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1206 if (kchan == NULL) {
1207 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1208 goto error;
1209 }
1210
1211 switch (event->type) {
1212 case LTTNG_EVENT_ALL:
1213 ret = event_kernel_disable_all(kchan);
1214 if (ret != LTTNG_OK) {
1215 goto error;
1216 }
1217 break;
1218 case LTTNG_EVENT_SYSCALL:
1219 ret = event_kernel_disable_syscall(kchan, "");
1220 if (ret != LTTNG_OK) {
1221 goto error;
1222 }
1223 break;
1224 default:
1225 ret = LTTNG_ERR_UNK;
1226 goto error;
1227 }
1228
1229 kernel_wait_quiescent(kernel_tracer_fd);
1230 break;
1231 }
1232 default:
1233 ret = LTTNG_ERR_UND;
1234 goto error;
1235 }
1236
1237 ret = LTTNG_OK;
1238
1239 error:
1240 rcu_read_unlock();
1241 return ret;
1242 }
1243
1244 /*
1245 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1246 */
1247 int cmd_add_context(struct ltt_session *session, int domain,
1248 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1249 {
1250 int ret, chan_kern_created = 0, chan_ust_created = 0;
1251
1252 switch (domain) {
1253 case LTTNG_DOMAIN_KERNEL:
1254 assert(session->kernel_session);
1255
1256 if (session->kernel_session->channel_count == 0) {
1257 /* Create default channel */
1258 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1259 if (ret != LTTNG_OK) {
1260 goto error;
1261 }
1262 chan_kern_created = 1;
1263 }
1264 /* Add kernel context to kernel tracer */
1265 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1266 if (ret != LTTNG_OK) {
1267 goto error;
1268 }
1269 break;
1270 case LTTNG_DOMAIN_UST:
1271 {
1272 struct ltt_ust_session *usess = session->ust_session;
1273 unsigned int chan_count;
1274
1275 assert(usess);
1276
1277 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1278 if (chan_count == 0) {
1279 struct lttng_channel *attr;
1280 /* Create default channel */
1281 attr = channel_new_default_attr(domain, usess->buffer_type);
1282 if (attr == NULL) {
1283 ret = LTTNG_ERR_FATAL;
1284 goto error;
1285 }
1286
1287 ret = channel_ust_create(usess, attr, usess->buffer_type);
1288 if (ret != LTTNG_OK) {
1289 free(attr);
1290 goto error;
1291 }
1292 free(attr);
1293 chan_ust_created = 1;
1294 }
1295
1296 ret = context_ust_add(usess, domain, ctx, channel_name);
1297 if (ret != LTTNG_OK) {
1298 goto error;
1299 }
1300 break;
1301 }
1302 #if 0
1303 case LTTNG_DOMAIN_UST_EXEC_NAME:
1304 case LTTNG_DOMAIN_UST_PID:
1305 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1306 #endif
1307 default:
1308 ret = LTTNG_ERR_UND;
1309 goto error;
1310 }
1311
1312 return LTTNG_OK;
1313
1314 error:
1315 if (chan_kern_created) {
1316 struct ltt_kernel_channel *kchan =
1317 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1318 session->kernel_session);
1319 /* Created previously, this should NOT fail. */
1320 assert(kchan);
1321 kernel_destroy_channel(kchan);
1322 }
1323
1324 if (chan_ust_created) {
1325 struct ltt_ust_channel *uchan =
1326 trace_ust_find_channel_by_name(
1327 session->ust_session->domain_global.channels,
1328 DEFAULT_CHANNEL_NAME);
1329 /* Created previously, this should NOT fail. */
1330 assert(uchan);
1331 /* Remove from the channel list of the session. */
1332 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1333 uchan);
1334 trace_ust_destroy_channel(uchan);
1335 }
1336 return ret;
1337 }
1338
1339 static int validate_event_name(const char *name)
1340 {
1341 int ret = 0;
1342 const char *c = name;
1343 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1344
1345 /*
1346 * Make sure that unescaped wildcards are only used as the last
1347 * character of the event name.
1348 */
1349 while (c < event_name_end) {
1350 switch (*c) {
1351 case '\0':
1352 goto end;
1353 case '\\':
1354 c++;
1355 break;
1356 case '*':
1357 if ((c + 1) < event_name_end && *(c + 1)) {
1358 /* Wildcard is not the last character */
1359 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1360 goto end;
1361 }
1362 default:
1363 break;
1364 }
1365 c++;
1366 }
1367 end:
1368 return ret;
1369 }
1370
1371 /*
1372 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1373 */
1374 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1375 char *channel_name, struct lttng_event *event,
1376 char *filter_expression,
1377 struct lttng_filter_bytecode *filter,
1378 struct lttng_event_exclusion *exclusion,
1379 int wpipe)
1380 {
1381 int ret, channel_created = 0;
1382 struct lttng_channel *attr;
1383
1384 assert(session);
1385 assert(event);
1386 assert(channel_name);
1387
1388 DBG("Enable event command for event \'%s\'", event->name);
1389
1390 /* Special handling for kernel domain all events. */
1391 if (domain->type == LTTNG_DOMAIN_KERNEL && !strcmp(event->name, "*")) {
1392 return enable_kevent_all(session, domain, channel_name, event,
1393 filter_expression, filter, wpipe);
1394 }
1395
1396 ret = validate_event_name(event->name);
1397 if (ret) {
1398 goto error;
1399 }
1400
1401 rcu_read_lock();
1402
1403 switch (domain->type) {
1404 case LTTNG_DOMAIN_KERNEL:
1405 {
1406 struct ltt_kernel_channel *kchan;
1407
1408 /*
1409 * If a non-default channel has been created in the
1410 * session, explicitely require that -c chan_name needs
1411 * to be provided.
1412 */
1413 if (session->kernel_session->has_non_default_channel
1414 && channel_name[0] == '\0') {
1415 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1416 goto error;
1417 }
1418
1419 kchan = trace_kernel_get_channel_by_name(channel_name,
1420 session->kernel_session);
1421 if (kchan == NULL) {
1422 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1423 LTTNG_BUFFER_GLOBAL);
1424 if (attr == NULL) {
1425 ret = LTTNG_ERR_FATAL;
1426 goto error;
1427 }
1428 strncpy(attr->name, channel_name, sizeof(attr->name));
1429
1430 ret = cmd_enable_channel(session, domain, attr, wpipe);
1431 if (ret != LTTNG_OK) {
1432 free(attr);
1433 goto error;
1434 }
1435 free(attr);
1436
1437 channel_created = 1;
1438 }
1439
1440 /* Get the newly created kernel channel pointer */
1441 kchan = trace_kernel_get_channel_by_name(channel_name,
1442 session->kernel_session);
1443 if (kchan == NULL) {
1444 /* This sould not happen... */
1445 ret = LTTNG_ERR_FATAL;
1446 goto error;
1447 }
1448
1449 switch (event->type) {
1450 case LTTNG_EVENT_ALL:
1451 case LTTNG_EVENT_TRACEPOINT:
1452 ret = event_kernel_enable_tracepoint(kchan, event);
1453 if (ret != LTTNG_OK) {
1454 if (channel_created) {
1455 /* Let's not leak a useless channel. */
1456 kernel_destroy_channel(kchan);
1457 }
1458 goto error;
1459 }
1460 break;
1461 case LTTNG_EVENT_SYSCALL:
1462 ret = event_kernel_enable_syscall(kchan, event->name);
1463 if (ret != LTTNG_OK) {
1464 goto error;
1465 }
1466 break;
1467 default:
1468 ret = LTTNG_ERR_UNK;
1469 goto error;
1470 }
1471
1472 kernel_wait_quiescent(kernel_tracer_fd);
1473 break;
1474 }
1475 case LTTNG_DOMAIN_UST:
1476 {
1477 struct ltt_ust_channel *uchan;
1478 struct ltt_ust_session *usess = session->ust_session;
1479
1480 assert(usess);
1481
1482 /*
1483 * If a non-default channel has been created in the
1484 * session, explicitely require that -c chan_name needs
1485 * to be provided.
1486 */
1487 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1488 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1489 goto error;
1490 }
1491
1492 /* Get channel from global UST domain */
1493 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1494 channel_name);
1495 if (uchan == NULL) {
1496 /* Create default channel */
1497 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1498 usess->buffer_type);
1499 if (attr == NULL) {
1500 ret = LTTNG_ERR_FATAL;
1501 goto error;
1502 }
1503 strncpy(attr->name, channel_name, sizeof(attr->name));
1504
1505 ret = cmd_enable_channel(session, domain, attr, wpipe);
1506 if (ret != LTTNG_OK) {
1507 free(attr);
1508 goto error;
1509 }
1510 free(attr);
1511
1512 /* Get the newly created channel reference back */
1513 uchan = trace_ust_find_channel_by_name(
1514 usess->domain_global.channels, channel_name);
1515 assert(uchan);
1516 }
1517
1518 /* At this point, the session and channel exist on the tracer */
1519 ret = event_ust_enable_tracepoint(usess, uchan, event,
1520 filter_expression, filter, exclusion);
1521 if (ret != LTTNG_OK) {
1522 goto error;
1523 }
1524 break;
1525 }
1526 case LTTNG_DOMAIN_LOG4J:
1527 case LTTNG_DOMAIN_JUL:
1528 {
1529 const char *default_event_name, *default_chan_name;
1530 struct agent *agt;
1531 struct lttng_event uevent;
1532 struct lttng_domain tmp_dom;
1533 struct ltt_ust_session *usess = session->ust_session;
1534
1535 assert(usess);
1536
1537 agt = trace_ust_find_agent(usess, domain->type);
1538 if (!agt) {
1539 agt = agent_create(domain->type);
1540 if (!agt) {
1541 ret = -LTTNG_ERR_NOMEM;
1542 goto error;
1543 }
1544 agent_add(agt, usess->agents);
1545 }
1546
1547 /* Create the default tracepoint. */
1548 memset(&uevent, 0, sizeof(uevent));
1549 uevent.type = LTTNG_EVENT_TRACEPOINT;
1550 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1551 default_event_name = event_get_default_agent_ust_name(domain->type);
1552 if (!default_event_name) {
1553 ret = -LTTNG_ERR_FATAL;
1554 goto error;
1555 }
1556 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1557 uevent.name[sizeof(uevent.name) - 1] = '\0';
1558
1559 /*
1560 * The domain type is changed because we are about to enable the
1561 * default channel and event for the JUL domain that are hardcoded.
1562 * This happens in the UST domain.
1563 */
1564 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1565 tmp_dom.type = LTTNG_DOMAIN_UST;
1566
1567 if (domain->type == LTTNG_DOMAIN_LOG4J) {
1568 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1569 } else {
1570 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1571 }
1572
1573 ret = cmd_enable_event(session, &tmp_dom, (char *) default_chan_name,
1574 &uevent, filter_expression, filter, NULL, wpipe);
1575 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1576 goto error;
1577 }
1578
1579 /* The wild card * means that everything should be enabled. */
1580 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1581 ret = event_agent_enable_all(usess, agt, event, filter);
1582 } else {
1583 ret = event_agent_enable(usess, agt, event, filter);
1584 }
1585 if (ret != LTTNG_OK) {
1586 goto error;
1587 }
1588
1589 break;
1590 }
1591 #if 0
1592 case LTTNG_DOMAIN_UST_EXEC_NAME:
1593 case LTTNG_DOMAIN_UST_PID:
1594 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1595 #endif
1596 default:
1597 ret = LTTNG_ERR_UND;
1598 goto error;
1599 }
1600
1601 ret = LTTNG_OK;
1602
1603 error:
1604 rcu_read_unlock();
1605 return ret;
1606 }
1607
1608 /*
1609 * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
1610 */
1611 static
1612 int enable_kevent_all(struct ltt_session *session,
1613 struct lttng_domain *domain, char *channel_name,
1614 struct lttng_event *event,
1615 char *filter_expression,
1616 struct lttng_filter_bytecode *filter, int wpipe)
1617 {
1618 int ret;
1619 struct lttng_channel *attr;
1620
1621 assert(session);
1622 assert(channel_name);
1623
1624 rcu_read_lock();
1625
1626 switch (domain->type) {
1627 case LTTNG_DOMAIN_KERNEL:
1628 {
1629 struct ltt_kernel_channel *kchan;
1630
1631 assert(session->kernel_session);
1632
1633 /*
1634 * If a non-default channel has been created in the
1635 * session, explicitely require that -c chan_name needs
1636 * to be provided.
1637 */
1638 if (session->kernel_session->has_non_default_channel
1639 && channel_name[0] == '\0') {
1640 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1641 goto error;
1642 }
1643
1644 kchan = trace_kernel_get_channel_by_name(channel_name,
1645 session->kernel_session);
1646 if (kchan == NULL) {
1647 /* Create default channel */
1648 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1649 LTTNG_BUFFER_GLOBAL);
1650 if (attr == NULL) {
1651 ret = LTTNG_ERR_FATAL;
1652 goto error;
1653 }
1654 strncpy(attr->name, channel_name, sizeof(attr->name));
1655
1656 ret = cmd_enable_channel(session, domain, attr, wpipe);
1657 if (ret != LTTNG_OK) {
1658 free(attr);
1659 goto error;
1660 }
1661 free(attr);
1662
1663 /* Get the newly created kernel channel pointer */
1664 kchan = trace_kernel_get_channel_by_name(channel_name,
1665 session->kernel_session);
1666 assert(kchan);
1667 }
1668
1669 switch (event->type) {
1670 case LTTNG_EVENT_SYSCALL:
1671 ret = event_kernel_enable_syscall(kchan, "");
1672 if (ret != LTTNG_OK) {
1673 goto error;
1674 }
1675 break;
1676 case LTTNG_EVENT_TRACEPOINT:
1677 /*
1678 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1679 * events already registered to the channel.
1680 */
1681 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1682 break;
1683 case LTTNG_EVENT_ALL:
1684 /* Enable syscalls and tracepoints */
1685 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1686 break;
1687 default:
1688 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1689 goto error;
1690 }
1691
1692 /* Manage return value */
1693 if (ret != LTTNG_OK) {
1694 /*
1695 * On error, cmd_enable_channel call will take care of destroying
1696 * the created channel if it was needed.
1697 */
1698 goto error;
1699 }
1700
1701 kernel_wait_quiescent(kernel_tracer_fd);
1702 break;
1703 }
1704 default:
1705 ret = LTTNG_ERR_UND;
1706 goto error;
1707 }
1708
1709 ret = LTTNG_OK;
1710
1711 error:
1712 rcu_read_unlock();
1713 return ret;
1714 }
1715
1716
1717 /*
1718 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1719 */
1720 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1721 {
1722 int ret;
1723 ssize_t nb_events = 0;
1724
1725 switch (domain) {
1726 case LTTNG_DOMAIN_KERNEL:
1727 nb_events = kernel_list_events(kernel_tracer_fd, events);
1728 if (nb_events < 0) {
1729 ret = LTTNG_ERR_KERN_LIST_FAIL;
1730 goto error;
1731 }
1732 break;
1733 case LTTNG_DOMAIN_UST:
1734 nb_events = ust_app_list_events(events);
1735 if (nb_events < 0) {
1736 ret = LTTNG_ERR_UST_LIST_FAIL;
1737 goto error;
1738 }
1739 break;
1740 case LTTNG_DOMAIN_LOG4J:
1741 case LTTNG_DOMAIN_JUL:
1742 nb_events = agent_list_events(events, domain);
1743 if (nb_events < 0) {
1744 ret = LTTNG_ERR_UST_LIST_FAIL;
1745 goto error;
1746 }
1747 break;
1748 default:
1749 ret = LTTNG_ERR_UND;
1750 goto error;
1751 }
1752
1753 return nb_events;
1754
1755 error:
1756 /* Return negative value to differentiate return code */
1757 return -ret;
1758 }
1759
1760 /*
1761 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1762 */
1763 ssize_t cmd_list_tracepoint_fields(int domain,
1764 struct lttng_event_field **fields)
1765 {
1766 int ret;
1767 ssize_t nb_fields = 0;
1768
1769 switch (domain) {
1770 case LTTNG_DOMAIN_UST:
1771 nb_fields = ust_app_list_event_fields(fields);
1772 if (nb_fields < 0) {
1773 ret = LTTNG_ERR_UST_LIST_FAIL;
1774 goto error;
1775 }
1776 break;
1777 case LTTNG_DOMAIN_KERNEL:
1778 default: /* fall-through */
1779 ret = LTTNG_ERR_UND;
1780 goto error;
1781 }
1782
1783 return nb_fields;
1784
1785 error:
1786 /* Return negative value to differentiate return code */
1787 return -ret;
1788 }
1789
1790 /*
1791 * Command LTTNG_START_TRACE processed by the client thread.
1792 */
1793 int cmd_start_trace(struct ltt_session *session)
1794 {
1795 int ret;
1796 unsigned long nb_chan = 0;
1797 struct ltt_kernel_session *ksession;
1798 struct ltt_ust_session *usess;
1799
1800 assert(session);
1801
1802 /* Ease our life a bit ;) */
1803 ksession = session->kernel_session;
1804 usess = session->ust_session;
1805
1806 /* Is the session already started? */
1807 if (session->active) {
1808 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1809 goto error;
1810 }
1811
1812 /*
1813 * Starting a session without channel is useless since after that it's not
1814 * possible to enable channel thus inform the client.
1815 */
1816 if (usess && usess->domain_global.channels) {
1817 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1818 }
1819 if (ksession) {
1820 nb_chan += ksession->channel_count;
1821 }
1822 if (!nb_chan) {
1823 ret = LTTNG_ERR_NO_CHANNEL;
1824 goto error;
1825 }
1826
1827 /* Kernel tracing */
1828 if (ksession != NULL) {
1829 ret = start_kernel_session(ksession, kernel_tracer_fd);
1830 if (ret != LTTNG_OK) {
1831 goto error;
1832 }
1833 }
1834
1835 /* Flag session that trace should start automatically */
1836 if (usess) {
1837 /*
1838 * Even though the start trace might fail, flag this session active so
1839 * other application coming in are started by default.
1840 */
1841 usess->active = 1;
1842
1843 ret = ust_app_start_trace_all(usess);
1844 if (ret < 0) {
1845 ret = LTTNG_ERR_UST_START_FAIL;
1846 goto error;
1847 }
1848 }
1849
1850 /* Flag this after a successful start. */
1851 session->has_been_started = 1;
1852 session->active = 1;
1853
1854 ret = LTTNG_OK;
1855
1856 error:
1857 return ret;
1858 }
1859
1860 /*
1861 * Command LTTNG_STOP_TRACE processed by the client thread.
1862 */
1863 int cmd_stop_trace(struct ltt_session *session)
1864 {
1865 int ret;
1866 struct ltt_kernel_channel *kchan;
1867 struct ltt_kernel_session *ksession;
1868 struct ltt_ust_session *usess;
1869
1870 assert(session);
1871
1872 /* Short cut */
1873 ksession = session->kernel_session;
1874 usess = session->ust_session;
1875
1876 /* Session is not active. Skip everythong and inform the client. */
1877 if (!session->active) {
1878 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1879 goto error;
1880 }
1881
1882 /* Kernel tracer */
1883 if (ksession && ksession->active) {
1884 DBG("Stop kernel tracing");
1885
1886 /* Flush metadata if exist */
1887 if (ksession->metadata_stream_fd >= 0) {
1888 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1889 if (ret < 0) {
1890 ERR("Kernel metadata flush failed");
1891 }
1892 }
1893
1894 /* Flush all buffers before stopping */
1895 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1896 ret = kernel_flush_buffer(kchan);
1897 if (ret < 0) {
1898 ERR("Kernel flush buffer error");
1899 }
1900 }
1901
1902 ret = kernel_stop_session(ksession);
1903 if (ret < 0) {
1904 ret = LTTNG_ERR_KERN_STOP_FAIL;
1905 goto error;
1906 }
1907
1908 kernel_wait_quiescent(kernel_tracer_fd);
1909
1910 ksession->active = 0;
1911 }
1912
1913 if (usess && usess->active) {
1914 /*
1915 * Even though the stop trace might fail, flag this session inactive so
1916 * other application coming in are not started by default.
1917 */
1918 usess->active = 0;
1919
1920 ret = ust_app_stop_trace_all(usess);
1921 if (ret < 0) {
1922 ret = LTTNG_ERR_UST_STOP_FAIL;
1923 goto error;
1924 }
1925 }
1926
1927 /* Flag inactive after a successful stop. */
1928 session->active = 0;
1929 ret = LTTNG_OK;
1930
1931 error:
1932 return ret;
1933 }
1934
1935 /*
1936 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1937 */
1938 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1939 size_t nb_uri, struct lttng_uri *uris)
1940 {
1941 int ret, i;
1942 struct ltt_kernel_session *ksess = session->kernel_session;
1943 struct ltt_ust_session *usess = session->ust_session;
1944 struct consumer_output *consumer = NULL;
1945
1946 assert(session);
1947 assert(uris);
1948 assert(nb_uri > 0);
1949
1950 /* Can't set consumer URI if the session is active. */
1951 if (session->active) {
1952 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1953 goto error;
1954 }
1955
1956 /*
1957 * This case switch makes sure the domain session has a temporary consumer
1958 * so the URL can be set.
1959 */
1960 switch (domain) {
1961 case 0:
1962 /* Code flow error. A session MUST always have a consumer object */
1963 assert(session->consumer);
1964 /*
1965 * The URL will be added to the tracing session consumer instead of a
1966 * specific domain consumer.
1967 */
1968 consumer = session->consumer;
1969 break;
1970 case LTTNG_DOMAIN_KERNEL:
1971 /* Code flow error if we don't have a kernel session here. */
1972 assert(ksess);
1973 assert(ksess->consumer);
1974 consumer = ksess->consumer;
1975 break;
1976 case LTTNG_DOMAIN_UST:
1977 /* Code flow error if we don't have a kernel session here. */
1978 assert(usess);
1979 assert(usess->consumer);
1980 consumer = usess->consumer;
1981 break;
1982 }
1983
1984 for (i = 0; i < nb_uri; i++) {
1985 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1986 if (ret != LTTNG_OK) {
1987 goto error;
1988 }
1989 }
1990
1991 /*
1992 * Make sure to set the session in output mode after we set URI since a
1993 * session can be created without URL (thus flagged in no output mode).
1994 */
1995 session->output_traces = 1;
1996 if (ksess) {
1997 ksess->output_traces = 1;
1998 } else if (usess) {
1999 usess->output_traces = 1;
2000 }
2001
2002 /* All good! */
2003 ret = LTTNG_OK;
2004
2005 error:
2006 return ret;
2007 }
2008
2009 /*
2010 * Command LTTNG_CREATE_SESSION processed by the client thread.
2011 */
2012 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2013 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2014 {
2015 int ret;
2016 struct ltt_session *session;
2017
2018 assert(name);
2019 assert(creds);
2020
2021 /*
2022 * Verify if the session already exist
2023 *
2024 * XXX: There is no need for the session lock list here since the caller
2025 * (process_client_msg) is holding it. We might want to change that so a
2026 * single command does not lock the entire session list.
2027 */
2028 session = session_find_by_name(name);
2029 if (session != NULL) {
2030 ret = LTTNG_ERR_EXIST_SESS;
2031 goto find_error;
2032 }
2033
2034 /* Create tracing session in the registry */
2035 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2036 LTTNG_SOCK_GET_GID_CRED(creds));
2037 if (ret != LTTNG_OK) {
2038 goto session_error;
2039 }
2040
2041 /*
2042 * Get the newly created session pointer back
2043 *
2044 * XXX: There is no need for the session lock list here since the caller
2045 * (process_client_msg) is holding it. We might want to change that so a
2046 * single command does not lock the entire session list.
2047 */
2048 session = session_find_by_name(name);
2049 assert(session);
2050
2051 session->live_timer = live_timer;
2052 /* Create default consumer output for the session not yet created. */
2053 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2054 if (session->consumer == NULL) {
2055 ret = LTTNG_ERR_FATAL;
2056 goto consumer_error;
2057 }
2058
2059 if (uris) {
2060 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2061 if (ret != LTTNG_OK) {
2062 goto consumer_error;
2063 }
2064 session->output_traces = 1;
2065 } else {
2066 session->output_traces = 0;
2067 DBG2("Session %s created with no output", session->name);
2068 }
2069
2070 session->consumer->enabled = 1;
2071
2072 return LTTNG_OK;
2073
2074 consumer_error:
2075 session_destroy(session);
2076 session_error:
2077 find_error:
2078 return ret;
2079 }
2080
2081 /*
2082 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2083 */
2084 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2085 size_t nb_uri, lttng_sock_cred *creds)
2086 {
2087 int ret;
2088 struct ltt_session *session;
2089 struct snapshot_output *new_output = NULL;
2090
2091 assert(name);
2092 assert(creds);
2093
2094 /*
2095 * Create session in no output mode with URIs set to NULL. The uris we've
2096 * received are for a default snapshot output if one.
2097 */
2098 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2099 if (ret != LTTNG_OK) {
2100 goto error;
2101 }
2102
2103 /* Get the newly created session pointer back. This should NEVER fail. */
2104 session = session_find_by_name(name);
2105 assert(session);
2106
2107 /* Flag session for snapshot mode. */
2108 session->snapshot_mode = 1;
2109
2110 /* Skip snapshot output creation if no URI is given. */
2111 if (nb_uri == 0) {
2112 goto end;
2113 }
2114
2115 new_output = snapshot_output_alloc();
2116 if (!new_output) {
2117 ret = LTTNG_ERR_NOMEM;
2118 goto error_snapshot_alloc;
2119 }
2120
2121 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2122 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2123 if (ret < 0) {
2124 if (ret == -ENOMEM) {
2125 ret = LTTNG_ERR_NOMEM;
2126 } else {
2127 ret = LTTNG_ERR_INVALID;
2128 }
2129 goto error_snapshot;
2130 }
2131
2132 rcu_read_lock();
2133 snapshot_add_output(&session->snapshot, new_output);
2134 rcu_read_unlock();
2135
2136 end:
2137 return LTTNG_OK;
2138
2139 error_snapshot:
2140 snapshot_output_destroy(new_output);
2141 error_snapshot_alloc:
2142 session_destroy(session);
2143 error:
2144 return ret;
2145 }
2146
2147 /*
2148 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2149 */
2150 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2151 {
2152 int ret;
2153 struct ltt_ust_session *usess;
2154 struct ltt_kernel_session *ksess;
2155
2156 /* Safety net */
2157 assert(session);
2158
2159 usess = session->ust_session;
2160 ksess = session->kernel_session;
2161
2162 /* Clean kernel session teardown */
2163 kernel_destroy_session(ksess);
2164
2165 /* UST session teardown */
2166 if (usess) {
2167 /* Close any relayd session */
2168 consumer_output_send_destroy_relayd(usess->consumer);
2169
2170 /* Destroy every UST application related to this session. */
2171 ret = ust_app_destroy_trace_all(usess);
2172 if (ret) {
2173 ERR("Error in ust_app_destroy_trace_all");
2174 }
2175
2176 /* Clean up the rest. */
2177 trace_ust_destroy_session(usess);
2178 }
2179
2180 /*
2181 * Must notify the kernel thread here to update it's poll set in order to
2182 * remove the channel(s)' fd just destroyed.
2183 */
2184 ret = notify_thread_pipe(wpipe);
2185 if (ret < 0) {
2186 PERROR("write kernel poll pipe");
2187 }
2188
2189 ret = session_destroy(session);
2190
2191 return ret;
2192 }
2193
2194 /*
2195 * Command LTTNG_CALIBRATE processed by the client thread.
2196 */
2197 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2198 {
2199 int ret;
2200
2201 switch (domain) {
2202 case LTTNG_DOMAIN_KERNEL:
2203 {
2204 struct lttng_kernel_calibrate kcalibrate;
2205
2206 switch (calibrate->type) {
2207 case LTTNG_CALIBRATE_FUNCTION:
2208 default:
2209 /* Default and only possible calibrate option. */
2210 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2211 break;
2212 }
2213
2214 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2215 if (ret < 0) {
2216 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2217 goto error;
2218 }
2219 break;
2220 }
2221 case LTTNG_DOMAIN_UST:
2222 {
2223 struct lttng_ust_calibrate ucalibrate;
2224
2225 switch (calibrate->type) {
2226 case LTTNG_CALIBRATE_FUNCTION:
2227 default:
2228 /* Default and only possible calibrate option. */
2229 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2230 break;
2231 }
2232
2233 ret = ust_app_calibrate_glb(&ucalibrate);
2234 if (ret < 0) {
2235 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2236 goto error;
2237 }
2238 break;
2239 }
2240 default:
2241 ret = LTTNG_ERR_UND;
2242 goto error;
2243 }
2244
2245 ret = LTTNG_OK;
2246
2247 error:
2248 return ret;
2249 }
2250
2251 /*
2252 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2253 */
2254 int cmd_register_consumer(struct ltt_session *session, int domain,
2255 const char *sock_path, struct consumer_data *cdata)
2256 {
2257 int ret, sock;
2258 struct consumer_socket *socket = NULL;
2259
2260 assert(session);
2261 assert(cdata);
2262 assert(sock_path);
2263
2264 switch (domain) {
2265 case LTTNG_DOMAIN_KERNEL:
2266 {
2267 struct ltt_kernel_session *ksess = session->kernel_session;
2268
2269 assert(ksess);
2270
2271 /* Can't register a consumer if there is already one */
2272 if (ksess->consumer_fds_sent != 0) {
2273 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2274 goto error;
2275 }
2276
2277 sock = lttcomm_connect_unix_sock(sock_path);
2278 if (sock < 0) {
2279 ret = LTTNG_ERR_CONNECT_FAIL;
2280 goto error;
2281 }
2282 cdata->cmd_sock = sock;
2283
2284 socket = consumer_allocate_socket(&cdata->cmd_sock);
2285 if (socket == NULL) {
2286 ret = close(sock);
2287 if (ret < 0) {
2288 PERROR("close register consumer");
2289 }
2290 cdata->cmd_sock = -1;
2291 ret = LTTNG_ERR_FATAL;
2292 goto error;
2293 }
2294
2295 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2296 if (socket->lock == NULL) {
2297 PERROR("zmalloc pthread mutex");
2298 ret = LTTNG_ERR_FATAL;
2299 goto error;
2300 }
2301 pthread_mutex_init(socket->lock, NULL);
2302 socket->registered = 1;
2303
2304 rcu_read_lock();
2305 consumer_add_socket(socket, ksess->consumer);
2306 rcu_read_unlock();
2307
2308 pthread_mutex_lock(&cdata->pid_mutex);
2309 cdata->pid = -1;
2310 pthread_mutex_unlock(&cdata->pid_mutex);
2311
2312 break;
2313 }
2314 default:
2315 /* TODO: Userspace tracing */
2316 ret = LTTNG_ERR_UND;
2317 goto error;
2318 }
2319
2320 return LTTNG_OK;
2321
2322 error:
2323 if (socket) {
2324 consumer_destroy_socket(socket);
2325 }
2326 return ret;
2327 }
2328
2329 /*
2330 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2331 */
2332 ssize_t cmd_list_domains(struct ltt_session *session,
2333 struct lttng_domain **domains)
2334 {
2335 int ret, index = 0;
2336 ssize_t nb_dom = 0;
2337 struct agent *agt;
2338 struct lttng_ht_iter iter;
2339
2340 if (session->kernel_session != NULL) {
2341 DBG3("Listing domains found kernel domain");
2342 nb_dom++;
2343 }
2344
2345 if (session->ust_session != NULL) {
2346 DBG3("Listing domains found UST global domain");
2347 nb_dom++;
2348
2349 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2350 agt, node.node) {
2351 if (agt->being_used) {
2352 nb_dom++;
2353 }
2354 }
2355 }
2356
2357 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2358 if (*domains == NULL) {
2359 ret = LTTNG_ERR_FATAL;
2360 goto error;
2361 }
2362
2363 if (session->kernel_session != NULL) {
2364 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2365 index++;
2366 }
2367
2368 if (session->ust_session != NULL) {
2369 (*domains)[index].type = LTTNG_DOMAIN_UST;
2370 (*domains)[index].buf_type = session->ust_session->buffer_type;
2371 index++;
2372
2373 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2374 agt, node.node) {
2375 if (agt->being_used) {
2376 (*domains)[index].type = agt->domain;
2377 (*domains)[index].buf_type = session->ust_session->buffer_type;
2378 index++;
2379 }
2380 }
2381 }
2382
2383 return nb_dom;
2384
2385 error:
2386 /* Return negative value to differentiate return code */
2387 return -ret;
2388 }
2389
2390
2391 /*
2392 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2393 */
2394 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2395 struct lttng_channel **channels)
2396 {
2397 int ret;
2398 ssize_t nb_chan = 0;
2399
2400 switch (domain) {
2401 case LTTNG_DOMAIN_KERNEL:
2402 if (session->kernel_session != NULL) {
2403 nb_chan = session->kernel_session->channel_count;
2404 }
2405 DBG3("Number of kernel channels %zd", nb_chan);
2406 if (nb_chan <= 0) {
2407 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2408 }
2409 break;
2410 case LTTNG_DOMAIN_UST:
2411 if (session->ust_session != NULL) {
2412 nb_chan = lttng_ht_get_count(
2413 session->ust_session->domain_global.channels);
2414 }
2415 DBG3("Number of UST global channels %zd", nb_chan);
2416 if (nb_chan <= 0) {
2417 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2418 }
2419 break;
2420 default:
2421 *channels = NULL;
2422 ret = LTTNG_ERR_UND;
2423 goto error;
2424 }
2425
2426 if (nb_chan > 0) {
2427 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2428 if (*channels == NULL) {
2429 ret = LTTNG_ERR_FATAL;
2430 goto error;
2431 }
2432
2433 list_lttng_channels(domain, session, *channels);
2434 } else {
2435 *channels = NULL;
2436 /* Ret value was set in the domain switch case */
2437 goto error;
2438 }
2439
2440 return nb_chan;
2441
2442 error:
2443 /* Return negative value to differentiate return code */
2444 return -ret;
2445 }
2446
2447 /*
2448 * Command LTTNG_LIST_EVENTS processed by the client thread.
2449 */
2450 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2451 char *channel_name, struct lttng_event **events)
2452 {
2453 int ret = 0;
2454 ssize_t nb_event = 0;
2455
2456 switch (domain) {
2457 case LTTNG_DOMAIN_KERNEL:
2458 if (session->kernel_session != NULL) {
2459 nb_event = list_lttng_kernel_events(channel_name,
2460 session->kernel_session, events);
2461 }
2462 break;
2463 case LTTNG_DOMAIN_UST:
2464 {
2465 if (session->ust_session != NULL) {
2466 nb_event = list_lttng_ust_global_events(channel_name,
2467 &session->ust_session->domain_global, events);
2468 }
2469 break;
2470 }
2471 case LTTNG_DOMAIN_LOG4J:
2472 case LTTNG_DOMAIN_JUL:
2473 if (session->ust_session) {
2474 struct lttng_ht_iter iter;
2475 struct agent *agt;
2476
2477 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2478 &iter.iter, agt, node.node) {
2479 nb_event = list_lttng_agent_events(agt, events);
2480 }
2481 }
2482 break;
2483 default:
2484 ret = LTTNG_ERR_UND;
2485 goto error;
2486 }
2487
2488 return nb_event;
2489
2490 error:
2491 /* Return negative value to differentiate return code */
2492 return -ret;
2493 }
2494
2495 /*
2496 * Using the session list, filled a lttng_session array to send back to the
2497 * client for session listing.
2498 *
2499 * The session list lock MUST be acquired before calling this function. Use
2500 * session_lock_list() and session_unlock_list().
2501 */
2502 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2503 gid_t gid)
2504 {
2505 int ret;
2506 unsigned int i = 0;
2507 struct ltt_session *session;
2508 struct ltt_session_list *list = session_get_list();
2509
2510 DBG("Getting all available session for UID %d GID %d",
2511 uid, gid);
2512 /*
2513 * Iterate over session list and append data after the control struct in
2514 * the buffer.
2515 */
2516 cds_list_for_each_entry(session, &list->head, list) {
2517 /*
2518 * Only list the sessions the user can control.
2519 */
2520 if (!session_access_ok(session, uid, gid)) {
2521 continue;
2522 }
2523
2524 struct ltt_kernel_session *ksess = session->kernel_session;
2525 struct ltt_ust_session *usess = session->ust_session;
2526
2527 if (session->consumer->type == CONSUMER_DST_NET ||
2528 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2529 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2530 ret = build_network_session_path(sessions[i].path,
2531 sizeof(sessions[i].path), session);
2532 } else {
2533 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2534 session->consumer->dst.trace_path);
2535 }
2536 if (ret < 0) {
2537 PERROR("snprintf session path");
2538 continue;
2539 }
2540
2541 strncpy(sessions[i].name, session->name, NAME_MAX);
2542 sessions[i].name[NAME_MAX - 1] = '\0';
2543 sessions[i].enabled = session->active;
2544 sessions[i].snapshot_mode = session->snapshot_mode;
2545 sessions[i].live_timer_interval = session->live_timer;
2546 i++;
2547 }
2548 }
2549
2550 /*
2551 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2552 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2553 */
2554 int cmd_data_pending(struct ltt_session *session)
2555 {
2556 int ret;
2557 struct ltt_kernel_session *ksess = session->kernel_session;
2558 struct ltt_ust_session *usess = session->ust_session;
2559
2560 assert(session);
2561
2562 /* Session MUST be stopped to ask for data availability. */
2563 if (session->active) {
2564 ret = LTTNG_ERR_SESSION_STARTED;
2565 goto error;
2566 } else {
2567 /*
2568 * If stopped, just make sure we've started before else the above call
2569 * will always send that there is data pending.
2570 *
2571 * The consumer assumes that when the data pending command is received,
2572 * the trace has been started before or else no output data is written
2573 * by the streams which is a condition for data pending. So, this is
2574 * *VERY* important that we don't ask the consumer before a start
2575 * trace.
2576 */
2577 if (!session->has_been_started) {
2578 ret = 0;
2579 goto error;
2580 }
2581 }
2582
2583 if (ksess && ksess->consumer) {
2584 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2585 if (ret == 1) {
2586 /* Data is still being extracted for the kernel. */
2587 goto error;
2588 }
2589 }
2590
2591 if (usess && usess->consumer) {
2592 ret = consumer_is_data_pending(usess->id, usess->consumer);
2593 if (ret == 1) {
2594 /* Data is still being extracted for the kernel. */
2595 goto error;
2596 }
2597 }
2598
2599 /* Data is ready to be read by a viewer */
2600 ret = 0;
2601
2602 error:
2603 return ret;
2604 }
2605
2606 /*
2607 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2608 *
2609 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2610 */
2611 int cmd_snapshot_add_output(struct ltt_session *session,
2612 struct lttng_snapshot_output *output, uint32_t *id)
2613 {
2614 int ret;
2615 struct snapshot_output *new_output;
2616
2617 assert(session);
2618 assert(output);
2619
2620 DBG("Cmd snapshot add output for session %s", session->name);
2621
2622 /*
2623 * Permission denied to create an output if the session is not
2624 * set in no output mode.
2625 */
2626 if (session->output_traces) {
2627 ret = LTTNG_ERR_EPERM;
2628 goto error;
2629 }
2630
2631 /* Only one output is allowed until we have the "tee" feature. */
2632 if (session->snapshot.nb_output == 1) {
2633 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2634 goto error;
2635 }
2636
2637 new_output = snapshot_output_alloc();
2638 if (!new_output) {
2639 ret = LTTNG_ERR_NOMEM;
2640 goto error;
2641 }
2642
2643 ret = snapshot_output_init(output->max_size, output->name,
2644 output->ctrl_url, output->data_url, session->consumer, new_output,
2645 &session->snapshot);
2646 if (ret < 0) {
2647 if (ret == -ENOMEM) {
2648 ret = LTTNG_ERR_NOMEM;
2649 } else {
2650 ret = LTTNG_ERR_INVALID;
2651 }
2652 goto free_error;
2653 }
2654
2655 rcu_read_lock();
2656 snapshot_add_output(&session->snapshot, new_output);
2657 if (id) {
2658 *id = new_output->id;
2659 }
2660 rcu_read_unlock();
2661
2662 return LTTNG_OK;
2663
2664 free_error:
2665 snapshot_output_destroy(new_output);
2666 error:
2667 return ret;
2668 }
2669
2670 /*
2671 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2672 *
2673 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2674 */
2675 int cmd_snapshot_del_output(struct ltt_session *session,
2676 struct lttng_snapshot_output *output)
2677 {
2678 int ret;
2679 struct snapshot_output *sout = NULL;
2680
2681 assert(session);
2682 assert(output);
2683
2684 rcu_read_lock();
2685
2686 /*
2687 * Permission denied to create an output if the session is not
2688 * set in no output mode.
2689 */
2690 if (session->output_traces) {
2691 ret = LTTNG_ERR_EPERM;
2692 goto error;
2693 }
2694
2695 if (output->id) {
2696 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2697 session->name);
2698 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2699 } else if (*output->name != '\0') {
2700 DBG("Cmd snapshot del output name %s for session %s", output->name,
2701 session->name);
2702 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2703 }
2704 if (!sout) {
2705 ret = LTTNG_ERR_INVALID;
2706 goto error;
2707 }
2708
2709 snapshot_delete_output(&session->snapshot, sout);
2710 snapshot_output_destroy(sout);
2711 ret = LTTNG_OK;
2712
2713 error:
2714 rcu_read_unlock();
2715 return ret;
2716 }
2717
2718 /*
2719 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2720 *
2721 * If no output is available, outputs is untouched and 0 is returned.
2722 *
2723 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2724 */
2725 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2726 struct lttng_snapshot_output **outputs)
2727 {
2728 int ret, idx = 0;
2729 struct lttng_snapshot_output *list;
2730 struct lttng_ht_iter iter;
2731 struct snapshot_output *output;
2732
2733 assert(session);
2734 assert(outputs);
2735
2736 DBG("Cmd snapshot list outputs for session %s", session->name);
2737
2738 /*
2739 * Permission denied to create an output if the session is not
2740 * set in no output mode.
2741 */
2742 if (session->output_traces) {
2743 ret = LTTNG_ERR_EPERM;
2744 goto error;
2745 }
2746
2747 if (session->snapshot.nb_output == 0) {
2748 ret = 0;
2749 goto error;
2750 }
2751
2752 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2753 if (!list) {
2754 ret = LTTNG_ERR_NOMEM;
2755 goto error;
2756 }
2757
2758 /* Copy list from session to the new list object. */
2759 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2760 output, node.node) {
2761 assert(output->consumer);
2762 list[idx].id = output->id;
2763 list[idx].max_size = output->max_size;
2764 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2765 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2766 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2767 sizeof(list[idx].ctrl_url));
2768 } else {
2769 /* Control URI. */
2770 ret = uri_to_str_url(&output->consumer->dst.net.control,
2771 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2772 if (ret < 0) {
2773 ret = LTTNG_ERR_NOMEM;
2774 goto free_error;
2775 }
2776
2777 /* Data URI. */
2778 ret = uri_to_str_url(&output->consumer->dst.net.data,
2779 list[idx].data_url, sizeof(list[idx].data_url));
2780 if (ret < 0) {
2781 ret = LTTNG_ERR_NOMEM;
2782 goto free_error;
2783 }
2784 }
2785 idx++;
2786 }
2787
2788 *outputs = list;
2789 return session->snapshot.nb_output;
2790
2791 free_error:
2792 free(list);
2793 error:
2794 return -ret;
2795 }
2796
2797 /*
2798 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2799 * snapshot output is *not* set with a remote destination.
2800 *
2801 * Return 0 on success or a LTTNG_ERR code.
2802 */
2803 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2804 struct snapshot_output *snap_output, struct ltt_session *session)
2805 {
2806 int ret = LTTNG_OK;
2807 struct lttng_ht_iter iter;
2808 struct consumer_socket *socket;
2809
2810 assert(consumer);
2811 assert(snap_output);
2812 assert(session);
2813
2814 DBG2("Set relayd object from snapshot output");
2815
2816 /* Ignore if snapshot consumer output is not network. */
2817 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2818 goto error;
2819 }
2820
2821 /*
2822 * For each consumer socket, create and send the relayd object of the
2823 * snapshot output.
2824 */
2825 rcu_read_lock();
2826 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2827 socket, node.node) {
2828 ret = send_consumer_relayd_sockets(0, session->id,
2829 snap_output->consumer, socket,
2830 session->name, session->hostname,
2831 session->live_timer);
2832 if (ret != LTTNG_OK) {
2833 rcu_read_unlock();
2834 goto error;
2835 }
2836 }
2837 rcu_read_unlock();
2838
2839 error:
2840 return ret;
2841 }
2842
2843 /*
2844 * Record a kernel snapshot.
2845 *
2846 * Return LTTNG_OK on success or a LTTNG_ERR code.
2847 */
2848 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2849 struct snapshot_output *output, struct ltt_session *session,
2850 int wait, uint64_t max_stream_size)
2851 {
2852 int ret;
2853
2854 assert(ksess);
2855 assert(output);
2856 assert(session);
2857
2858 /* Get the datetime for the snapshot output directory. */
2859 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2860 sizeof(output->datetime));
2861 if (!ret) {
2862 ret = LTTNG_ERR_INVALID;
2863 goto error;
2864 }
2865
2866 /*
2867 * Copy kernel session sockets so we can communicate with the right
2868 * consumer for the snapshot record command.
2869 */
2870 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2871 if (ret < 0) {
2872 ret = LTTNG_ERR_NOMEM;
2873 goto error;
2874 }
2875
2876 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2877 if (ret != LTTNG_OK) {
2878 goto error_snapshot;
2879 }
2880
2881 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2882 if (ret != LTTNG_OK) {
2883 goto error_snapshot;
2884 }
2885
2886 ret = LTTNG_OK;
2887
2888 error_snapshot:
2889 /* Clean up copied sockets so this output can use some other later on. */
2890 consumer_destroy_output_sockets(output->consumer);
2891 error:
2892 return ret;
2893 }
2894
2895 /*
2896 * Record a UST snapshot.
2897 *
2898 * Return 0 on success or a LTTNG_ERR error code.
2899 */
2900 static int record_ust_snapshot(struct ltt_ust_session *usess,
2901 struct snapshot_output *output, struct ltt_session *session,
2902 int wait, uint64_t max_stream_size)
2903 {
2904 int ret;
2905
2906 assert(usess);
2907 assert(output);
2908 assert(session);
2909
2910 /* Get the datetime for the snapshot output directory. */
2911 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2912 sizeof(output->datetime));
2913 if (!ret) {
2914 ret = LTTNG_ERR_INVALID;
2915 goto error;
2916 }
2917
2918 /*
2919 * Copy UST session sockets so we can communicate with the right
2920 * consumer for the snapshot record command.
2921 */
2922 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2923 if (ret < 0) {
2924 ret = LTTNG_ERR_NOMEM;
2925 goto error;
2926 }
2927
2928 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2929 if (ret != LTTNG_OK) {
2930 goto error_snapshot;
2931 }
2932
2933 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
2934 if (ret < 0) {
2935 switch (-ret) {
2936 case EINVAL:
2937 ret = LTTNG_ERR_INVALID;
2938 break;
2939 case ENODATA:
2940 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2941 break;
2942 default:
2943 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2944 break;
2945 }
2946 goto error_snapshot;
2947 }
2948
2949 ret = LTTNG_OK;
2950
2951 error_snapshot:
2952 /* Clean up copied sockets so this output can use some other later on. */
2953 consumer_destroy_output_sockets(output->consumer);
2954 error:
2955 return ret;
2956 }
2957
2958 /*
2959 * Return the biggest subbuffer size of all channels in the given session.
2960 */
2961 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
2962 {
2963 uint64_t max_size = 0;
2964
2965 assert(session);
2966
2967 if (session->kernel_session) {
2968 struct ltt_kernel_channel *chan;
2969 struct ltt_kernel_session *ksess = session->kernel_session;
2970
2971 /*
2972 * For each channel, add to the max size the size of each subbuffer
2973 * multiplied by their sized.
2974 */
2975 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
2976 if (chan->channel->attr.subbuf_size > max_size) {
2977 max_size = chan->channel->attr.subbuf_size;
2978 }
2979 }
2980 }
2981
2982 if (session->ust_session) {
2983 struct lttng_ht_iter iter;
2984 struct ltt_ust_channel *uchan;
2985 struct ltt_ust_session *usess = session->ust_session;
2986
2987 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
2988 uchan, node.node) {
2989 if (uchan->attr.subbuf_size > max_size) {
2990 max_size = uchan->attr.subbuf_size;
2991 }
2992 }
2993 }
2994
2995 return max_size;
2996 }
2997
2998 /*
2999 * Returns the total number of streams for a session or a negative value
3000 * on error.
3001 */
3002 static unsigned int get_session_nb_streams(struct ltt_session *session)
3003 {
3004 unsigned int total_streams = 0;
3005
3006 if (session->kernel_session) {
3007 struct ltt_kernel_session *ksess = session->kernel_session;
3008
3009 total_streams += ksess->stream_count_global;
3010 }
3011
3012 if (session->ust_session) {
3013 struct ltt_ust_session *usess = session->ust_session;
3014
3015 total_streams += ust_app_get_nb_stream(usess);
3016 }
3017
3018 return total_streams;
3019 }
3020
3021 /*
3022 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3023 *
3024 * The wait parameter is ignored so this call always wait for the snapshot to
3025 * complete before returning.
3026 *
3027 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3028 */
3029 int cmd_snapshot_record(struct ltt_session *session,
3030 struct lttng_snapshot_output *output, int wait)
3031 {
3032 int ret = LTTNG_OK;
3033 unsigned int use_tmp_output = 0;
3034 struct snapshot_output tmp_output;
3035 unsigned int nb_streams, snapshot_success = 0;
3036 uint64_t session_max_size = 0, max_stream_size = 0;
3037
3038 assert(session);
3039
3040 DBG("Cmd snapshot record for session %s", session->name);
3041
3042 /*
3043 * Permission denied to create an output if the session is not
3044 * set in no output mode.
3045 */
3046 if (session->output_traces) {
3047 ret = LTTNG_ERR_EPERM;
3048 goto error;
3049 }
3050
3051 /* The session needs to be started at least once. */
3052 if (!session->has_been_started) {
3053 ret = LTTNG_ERR_START_SESSION_ONCE;
3054 goto error;
3055 }
3056
3057 /* Use temporary output for the session. */
3058 if (output && *output->ctrl_url != '\0') {
3059 ret = snapshot_output_init(output->max_size, output->name,
3060 output->ctrl_url, output->data_url, session->consumer,
3061 &tmp_output, NULL);
3062 if (ret < 0) {
3063 if (ret == -ENOMEM) {
3064 ret = LTTNG_ERR_NOMEM;
3065 } else {
3066 ret = LTTNG_ERR_INVALID;
3067 }
3068 goto error;
3069 }
3070 /* Use the global session count for the temporary snapshot. */
3071 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3072 use_tmp_output = 1;
3073 }
3074
3075 /*
3076 * Get the session maximum size for a snapshot meaning it will compute the
3077 * size of all streams from all domain.
3078 */
3079 max_stream_size = get_session_max_subbuf_size(session);
3080
3081 nb_streams = get_session_nb_streams(session);
3082 if (nb_streams) {
3083 /*
3084 * The maximum size of the snapshot is the number of streams multiplied
3085 * by the biggest subbuf size of all channels in a session which is the
3086 * maximum stream size available for each stream. The session max size
3087 * is now checked against the snapshot max size value given by the user
3088 * and if lower, an error is returned.
3089 */
3090 session_max_size = max_stream_size * nb_streams;
3091 }
3092
3093 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3094 session_max_size, max_stream_size);
3095
3096 /*
3097 * If we use a temporary output, check right away if the max size fits else
3098 * for each output the max size will be checked.
3099 */
3100 if (use_tmp_output &&
3101 (tmp_output.max_size != 0 &&
3102 tmp_output.max_size < session_max_size)) {
3103 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3104 goto error;
3105 }
3106
3107 if (session->kernel_session) {
3108 struct ltt_kernel_session *ksess = session->kernel_session;
3109
3110 if (use_tmp_output) {
3111 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3112 wait, max_stream_size);
3113 if (ret != LTTNG_OK) {
3114 goto error;
3115 }
3116 snapshot_success = 1;
3117 } else {
3118 struct snapshot_output *sout;
3119 struct lttng_ht_iter iter;
3120
3121 rcu_read_lock();
3122 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3123 &iter.iter, sout, node.node) {
3124 /*
3125 * Make a local copy of the output and assign the possible
3126 * temporary value given by the caller.
3127 */
3128 memset(&tmp_output, 0, sizeof(tmp_output));
3129 memcpy(&tmp_output, sout, sizeof(tmp_output));
3130
3131 /* Use temporary max size. */
3132 if (output->max_size != (uint64_t) -1ULL) {
3133 tmp_output.max_size = output->max_size;
3134 }
3135
3136 if (tmp_output.max_size != 0 &&
3137 tmp_output.max_size < session_max_size) {
3138 rcu_read_unlock();
3139 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3140 goto error;
3141 }
3142
3143 /* Use temporary name. */
3144 if (*output->name != '\0') {
3145 strncpy(tmp_output.name, output->name,
3146 sizeof(tmp_output.name));
3147 }
3148
3149 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3150
3151 ret = record_kernel_snapshot(ksess, &tmp_output,
3152 session, wait, max_stream_size);
3153 if (ret != LTTNG_OK) {
3154 rcu_read_unlock();
3155 goto error;
3156 }
3157 snapshot_success = 1;
3158 }
3159 rcu_read_unlock();
3160 }
3161 }
3162
3163 if (session->ust_session) {
3164 struct ltt_ust_session *usess = session->ust_session;
3165
3166 if (use_tmp_output) {
3167 ret = record_ust_snapshot(usess, &tmp_output, session,
3168 wait, max_stream_size);
3169 if (ret != LTTNG_OK) {
3170 goto error;
3171 }
3172 snapshot_success = 1;
3173 } else {
3174 struct snapshot_output *sout;
3175 struct lttng_ht_iter iter;
3176
3177 rcu_read_lock();
3178 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3179 &iter.iter, sout, node.node) {
3180 /*
3181 * Make a local copy of the output and assign the possible
3182 * temporary value given by the caller.
3183 */
3184 memset(&tmp_output, 0, sizeof(tmp_output));
3185 memcpy(&tmp_output, sout, sizeof(tmp_output));
3186
3187 /* Use temporary max size. */
3188 if (output->max_size != (uint64_t) -1ULL) {
3189 tmp_output.max_size = output->max_size;
3190 }
3191
3192 if (tmp_output.max_size != 0 &&
3193 tmp_output.max_size < session_max_size) {
3194 rcu_read_unlock();
3195 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3196 goto error;
3197 }
3198
3199 /* Use temporary name. */
3200 if (*output->name != '\0') {
3201 strncpy(tmp_output.name, output->name,
3202 sizeof(tmp_output.name));
3203 }
3204
3205 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3206
3207 ret = record_ust_snapshot(usess, &tmp_output, session,
3208 wait, max_stream_size);
3209 if (ret != LTTNG_OK) {
3210 rcu_read_unlock();
3211 goto error;
3212 }
3213 snapshot_success = 1;
3214 }
3215 rcu_read_unlock();
3216 }
3217 }
3218
3219 if (snapshot_success) {
3220 session->snapshot.nb_snapshot++;
3221 } else {
3222 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3223 }
3224
3225 error:
3226 return ret;
3227 }
3228
3229 /*
3230 * Init command subsystem.
3231 */
3232 void cmd_init(void)
3233 {
3234 /*
3235 * Set network sequence index to 1 for streams to match a relayd
3236 * socket on the consumer side.
3237 */
3238 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3239 relayd_net_seq_idx = 1;
3240 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3241
3242 DBG("Command subsystem initialized");
3243 }
LTTng tools - Deliverables
This page took 0.148378 seconds and 4 git commands to generate.