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