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Fix: Missing rcu_read_lock in cmd_snapshot_list_outputs()
[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->has_been_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 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
953 if (attr->name[0] != '\0') {
954 session->kernel_session->has_non_default_channel = 1;
955 }
956 } else {
957 ret = channel_kernel_enable(session->kernel_session, kchan);
958 }
959
960 if (ret != LTTNG_OK) {
961 goto error;
962 }
963
964 kernel_wait_quiescent(kernel_tracer_fd);
965 break;
966 }
967 case LTTNG_DOMAIN_UST:
968 {
969 struct ltt_ust_channel *uchan;
970
971 chan_ht = usess->domain_global.channels;
972
973 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
974 if (uchan == NULL) {
975 ret = channel_ust_create(usess, attr, domain->buf_type);
976 if (attr->name[0] != '\0') {
977 usess->has_non_default_channel = 1;
978 }
979 } else {
980 ret = channel_ust_enable(usess, uchan);
981 }
982 break;
983 }
984 default:
985 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
986 goto error;
987 }
988
989 error:
990 rcu_read_unlock();
991 return ret;
992 }
993
994
995 /*
996 * Command LTTNG_DISABLE_EVENT processed by the client thread.
997 */
998 int cmd_disable_event(struct ltt_session *session, int domain,
999 char *channel_name, char *event_name)
1000 {
1001 int ret;
1002
1003 rcu_read_lock();
1004
1005 switch (domain) {
1006 case LTTNG_DOMAIN_KERNEL:
1007 {
1008 struct ltt_kernel_channel *kchan;
1009 struct ltt_kernel_session *ksess;
1010
1011 ksess = session->kernel_session;
1012
1013 /*
1014 * If a non-default channel has been created in the
1015 * session, explicitely require that -c chan_name needs
1016 * to be provided.
1017 */
1018 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1019 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1020 goto error;
1021 }
1022
1023 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1024 if (kchan == NULL) {
1025 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1026 goto error;
1027 }
1028
1029 ret = event_kernel_disable_tracepoint(kchan, event_name);
1030 if (ret != LTTNG_OK) {
1031 goto error;
1032 }
1033
1034 kernel_wait_quiescent(kernel_tracer_fd);
1035 break;
1036 }
1037 case LTTNG_DOMAIN_UST:
1038 {
1039 struct ltt_ust_channel *uchan;
1040 struct ltt_ust_session *usess;
1041
1042 usess = session->ust_session;
1043
1044 /*
1045 * If a non-default channel has been created in the
1046 * session, explicitely require that -c chan_name needs
1047 * to be provided.
1048 */
1049 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1050 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1051 goto error;
1052 }
1053
1054 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1055 channel_name);
1056 if (uchan == NULL) {
1057 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1058 goto error;
1059 }
1060
1061 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1062 if (ret != LTTNG_OK) {
1063 goto error;
1064 }
1065
1066 DBG3("Disable UST event %s in channel %s completed", event_name,
1067 channel_name);
1068 break;
1069 }
1070 case LTTNG_DOMAIN_JUL:
1071 {
1072 struct ltt_ust_session *usess = session->ust_session;
1073
1074 assert(usess);
1075
1076 ret = event_jul_disable(usess, event_name);
1077 if (ret != LTTNG_OK) {
1078 goto error;
1079 }
1080
1081 break;
1082 }
1083 #if 0
1084 case LTTNG_DOMAIN_UST_EXEC_NAME:
1085 case LTTNG_DOMAIN_UST_PID:
1086 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1087 #endif
1088 default:
1089 ret = LTTNG_ERR_UND;
1090 goto error;
1091 }
1092
1093 ret = LTTNG_OK;
1094
1095 error:
1096 rcu_read_unlock();
1097 return ret;
1098 }
1099
1100 /*
1101 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1102 */
1103 int cmd_disable_event_all(struct ltt_session *session, int domain,
1104 char *channel_name)
1105 {
1106 int ret;
1107
1108 rcu_read_lock();
1109
1110 switch (domain) {
1111 case LTTNG_DOMAIN_KERNEL:
1112 {
1113 struct ltt_kernel_session *ksess;
1114 struct ltt_kernel_channel *kchan;
1115
1116 ksess = session->kernel_session;
1117
1118 /*
1119 * If a non-default channel has been created in the
1120 * session, explicitely require that -c chan_name needs
1121 * to be provided.
1122 */
1123 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1124 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1125 goto error;
1126 }
1127
1128 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1129 if (kchan == NULL) {
1130 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1131 goto error;
1132 }
1133
1134 ret = event_kernel_disable_all(kchan);
1135 if (ret != LTTNG_OK) {
1136 goto error;
1137 }
1138
1139 kernel_wait_quiescent(kernel_tracer_fd);
1140 break;
1141 }
1142 case LTTNG_DOMAIN_UST:
1143 {
1144 struct ltt_ust_session *usess;
1145 struct ltt_ust_channel *uchan;
1146
1147 usess = session->ust_session;
1148
1149 /*
1150 * If a non-default channel has been created in the
1151 * session, explicitely require that -c chan_name needs
1152 * to be provided.
1153 */
1154 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1155 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1156 goto error;
1157 }
1158
1159 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1160 channel_name);
1161 if (uchan == NULL) {
1162 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1163 goto error;
1164 }
1165
1166 ret = event_ust_disable_all_tracepoints(usess, uchan);
1167 if (ret != 0) {
1168 goto error;
1169 }
1170
1171 DBG3("Disable all UST events in channel %s completed", channel_name);
1172
1173 break;
1174 }
1175 case LTTNG_DOMAIN_JUL:
1176 {
1177 struct ltt_ust_session *usess = session->ust_session;
1178
1179 assert(usess);
1180
1181 ret = event_jul_disable_all(usess);
1182 if (ret != LTTNG_OK) {
1183 goto error;
1184 }
1185
1186 break;
1187 }
1188 #if 0
1189 case LTTNG_DOMAIN_UST_EXEC_NAME:
1190 case LTTNG_DOMAIN_UST_PID:
1191 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1192 #endif
1193 default:
1194 ret = LTTNG_ERR_UND;
1195 goto error;
1196 }
1197
1198 ret = LTTNG_OK;
1199
1200 error:
1201 rcu_read_unlock();
1202 return ret;
1203 }
1204
1205 /*
1206 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1207 */
1208 int cmd_add_context(struct ltt_session *session, int domain,
1209 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1210 {
1211 int ret, chan_kern_created = 0, chan_ust_created = 0;
1212
1213 switch (domain) {
1214 case LTTNG_DOMAIN_KERNEL:
1215 assert(session->kernel_session);
1216
1217 if (session->kernel_session->channel_count == 0) {
1218 /* Create default channel */
1219 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1220 if (ret != LTTNG_OK) {
1221 goto error;
1222 }
1223 chan_kern_created = 1;
1224 }
1225 /* Add kernel context to kernel tracer */
1226 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1227 if (ret != LTTNG_OK) {
1228 goto error;
1229 }
1230 break;
1231 case LTTNG_DOMAIN_UST:
1232 {
1233 struct ltt_ust_session *usess = session->ust_session;
1234 unsigned int chan_count;
1235
1236 assert(usess);
1237
1238 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1239 if (chan_count == 0) {
1240 struct lttng_channel *attr;
1241 /* Create default channel */
1242 attr = channel_new_default_attr(domain, usess->buffer_type);
1243 if (attr == NULL) {
1244 ret = LTTNG_ERR_FATAL;
1245 goto error;
1246 }
1247
1248 ret = channel_ust_create(usess, attr, usess->buffer_type);
1249 if (ret != LTTNG_OK) {
1250 free(attr);
1251 goto error;
1252 }
1253 free(attr);
1254 chan_ust_created = 1;
1255 }
1256
1257 ret = context_ust_add(usess, domain, ctx, channel_name);
1258 if (ret != LTTNG_OK) {
1259 goto error;
1260 }
1261 break;
1262 }
1263 #if 0
1264 case LTTNG_DOMAIN_UST_EXEC_NAME:
1265 case LTTNG_DOMAIN_UST_PID:
1266 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1267 #endif
1268 default:
1269 ret = LTTNG_ERR_UND;
1270 goto error;
1271 }
1272
1273 return LTTNG_OK;
1274
1275 error:
1276 if (chan_kern_created) {
1277 struct ltt_kernel_channel *kchan =
1278 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1279 session->kernel_session);
1280 /* Created previously, this should NOT fail. */
1281 assert(kchan);
1282 kernel_destroy_channel(kchan);
1283 }
1284
1285 if (chan_ust_created) {
1286 struct ltt_ust_channel *uchan =
1287 trace_ust_find_channel_by_name(
1288 session->ust_session->domain_global.channels,
1289 DEFAULT_CHANNEL_NAME);
1290 /* Created previously, this should NOT fail. */
1291 assert(uchan);
1292 /* Remove from the channel list of the session. */
1293 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1294 uchan);
1295 trace_ust_destroy_channel(uchan);
1296 }
1297 return ret;
1298 }
1299
1300 /*
1301 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1302 */
1303 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1304 char *channel_name, struct lttng_event *event,
1305 struct lttng_filter_bytecode *filter,
1306 struct lttng_event_exclusion *exclusion,
1307 int wpipe)
1308 {
1309 int ret, channel_created = 0;
1310 struct lttng_channel *attr;
1311
1312 assert(session);
1313 assert(event);
1314 assert(channel_name);
1315
1316 rcu_read_lock();
1317
1318 switch (domain->type) {
1319 case LTTNG_DOMAIN_KERNEL:
1320 {
1321 struct ltt_kernel_channel *kchan;
1322
1323 /*
1324 * If a non-default channel has been created in the
1325 * session, explicitely require that -c chan_name needs
1326 * to be provided.
1327 */
1328 if (session->kernel_session->has_non_default_channel
1329 && channel_name[0] == '\0') {
1330 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1331 goto error;
1332 }
1333
1334 kchan = trace_kernel_get_channel_by_name(channel_name,
1335 session->kernel_session);
1336 if (kchan == NULL) {
1337 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1338 LTTNG_BUFFER_GLOBAL);
1339 if (attr == NULL) {
1340 ret = LTTNG_ERR_FATAL;
1341 goto error;
1342 }
1343 strncpy(attr->name, channel_name, sizeof(attr->name));
1344
1345 ret = cmd_enable_channel(session, domain, attr, wpipe);
1346 if (ret != LTTNG_OK) {
1347 free(attr);
1348 goto error;
1349 }
1350 free(attr);
1351
1352 channel_created = 1;
1353 }
1354
1355 /* Get the newly created kernel channel pointer */
1356 kchan = trace_kernel_get_channel_by_name(channel_name,
1357 session->kernel_session);
1358 if (kchan == NULL) {
1359 /* This sould not happen... */
1360 ret = LTTNG_ERR_FATAL;
1361 goto error;
1362 }
1363
1364 ret = event_kernel_enable_tracepoint(kchan, event);
1365 if (ret != LTTNG_OK) {
1366 if (channel_created) {
1367 /* Let's not leak a useless channel. */
1368 kernel_destroy_channel(kchan);
1369 }
1370 goto error;
1371 }
1372
1373 kernel_wait_quiescent(kernel_tracer_fd);
1374 break;
1375 }
1376 case LTTNG_DOMAIN_UST:
1377 {
1378 struct ltt_ust_channel *uchan;
1379 struct ltt_ust_session *usess = session->ust_session;
1380
1381 assert(usess);
1382
1383 /*
1384 * If a non-default channel has been created in the
1385 * session, explicitely require that -c chan_name needs
1386 * to be provided.
1387 */
1388 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1389 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1390 goto error;
1391 }
1392
1393 /* Get channel from global UST domain */
1394 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1395 channel_name);
1396 if (uchan == NULL) {
1397 /* Create default channel */
1398 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1399 usess->buffer_type);
1400 if (attr == NULL) {
1401 ret = LTTNG_ERR_FATAL;
1402 goto error;
1403 }
1404 strncpy(attr->name, channel_name, sizeof(attr->name));
1405
1406 ret = cmd_enable_channel(session, domain, attr, wpipe);
1407 if (ret != LTTNG_OK) {
1408 free(attr);
1409 goto error;
1410 }
1411 free(attr);
1412
1413 /* Get the newly created channel reference back */
1414 uchan = trace_ust_find_channel_by_name(
1415 usess->domain_global.channels, channel_name);
1416 assert(uchan);
1417 }
1418
1419 /* At this point, the session and channel exist on the tracer */
1420 ret = event_ust_enable_tracepoint(usess, uchan, event, filter, exclusion);
1421 if (ret != LTTNG_OK) {
1422 goto error;
1423 }
1424 break;
1425 }
1426 case LTTNG_DOMAIN_JUL:
1427 {
1428 struct lttng_event uevent;
1429 struct lttng_domain tmp_dom;
1430 struct ltt_ust_session *usess = session->ust_session;
1431
1432 assert(usess);
1433
1434 /* Create the default JUL tracepoint. */
1435 memset(&uevent, 0, sizeof(uevent));
1436 uevent.type = LTTNG_EVENT_TRACEPOINT;
1437 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1438 if (is_root) {
1439 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1440 sizeof(uevent.name));
1441 } else {
1442 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1443 sizeof(uevent.name));
1444 }
1445 uevent.name[sizeof(uevent.name) - 1] = '\0';
1446
1447 /*
1448 * The domain type is changed because we are about to enable the
1449 * default channel and event for the JUL domain that are hardcoded.
1450 * This happens in the UST domain.
1451 */
1452 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1453 tmp_dom.type = LTTNG_DOMAIN_UST;
1454
1455 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1456 &uevent, filter, NULL, wpipe);
1457 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1458 goto error;
1459 }
1460
1461 /* The wild card * means that everything should be enabled. */
1462 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1463 ret = event_jul_enable_all(usess, event, filter);
1464 } else {
1465 ret = event_jul_enable(usess, event, filter);
1466 }
1467 if (ret != LTTNG_OK) {
1468 goto error;
1469 }
1470
1471 break;
1472 }
1473 #if 0
1474 case LTTNG_DOMAIN_UST_EXEC_NAME:
1475 case LTTNG_DOMAIN_UST_PID:
1476 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1477 #endif
1478 default:
1479 ret = LTTNG_ERR_UND;
1480 goto error;
1481 }
1482
1483 ret = LTTNG_OK;
1484
1485 error:
1486 rcu_read_unlock();
1487 return ret;
1488 }
1489
1490 /*
1491 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1492 */
1493 int cmd_enable_event_all(struct ltt_session *session,
1494 struct lttng_domain *domain, char *channel_name, int event_type,
1495 struct lttng_filter_bytecode *filter, int wpipe)
1496 {
1497 int ret;
1498 struct lttng_channel *attr;
1499
1500 assert(session);
1501 assert(channel_name);
1502
1503 rcu_read_lock();
1504
1505 switch (domain->type) {
1506 case LTTNG_DOMAIN_KERNEL:
1507 {
1508 struct ltt_kernel_channel *kchan;
1509
1510 assert(session->kernel_session);
1511
1512 /*
1513 * If a non-default channel has been created in the
1514 * session, explicitely require that -c chan_name needs
1515 * to be provided.
1516 */
1517 if (session->kernel_session->has_non_default_channel
1518 && channel_name[0] == '\0') {
1519 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1520 goto error;
1521 }
1522
1523 kchan = trace_kernel_get_channel_by_name(channel_name,
1524 session->kernel_session);
1525 if (kchan == NULL) {
1526 /* Create default channel */
1527 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1528 LTTNG_BUFFER_GLOBAL);
1529 if (attr == NULL) {
1530 ret = LTTNG_ERR_FATAL;
1531 goto error;
1532 }
1533 strncpy(attr->name, channel_name, sizeof(attr->name));
1534
1535 ret = cmd_enable_channel(session, domain, attr, wpipe);
1536 if (ret != LTTNG_OK) {
1537 free(attr);
1538 goto error;
1539 }
1540 free(attr);
1541
1542 /* Get the newly created kernel channel pointer */
1543 kchan = trace_kernel_get_channel_by_name(channel_name,
1544 session->kernel_session);
1545 assert(kchan);
1546 }
1547
1548 switch (event_type) {
1549 case LTTNG_EVENT_SYSCALL:
1550 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1551 break;
1552 case LTTNG_EVENT_TRACEPOINT:
1553 /*
1554 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1555 * events already registered to the channel.
1556 */
1557 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1558 break;
1559 case LTTNG_EVENT_ALL:
1560 /* Enable syscalls and tracepoints */
1561 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1562 break;
1563 default:
1564 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1565 goto error;
1566 }
1567
1568 /* Manage return value */
1569 if (ret != LTTNG_OK) {
1570 /*
1571 * On error, cmd_enable_channel call will take care of destroying
1572 * the created channel if it was needed.
1573 */
1574 goto error;
1575 }
1576
1577 kernel_wait_quiescent(kernel_tracer_fd);
1578 break;
1579 }
1580 case LTTNG_DOMAIN_UST:
1581 {
1582 struct ltt_ust_channel *uchan;
1583 struct ltt_ust_session *usess = session->ust_session;
1584
1585 assert(usess);
1586
1587 /*
1588 * If a non-default channel has been created in the
1589 * session, explicitely require that -c chan_name needs
1590 * to be provided.
1591 */
1592 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1593 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1594 goto error;
1595 }
1596
1597 /* Get channel from global UST domain */
1598 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1599 channel_name);
1600 if (uchan == NULL) {
1601 /* Create default channel */
1602 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1603 usess->buffer_type);
1604 if (attr == NULL) {
1605 ret = LTTNG_ERR_FATAL;
1606 goto error;
1607 }
1608 strncpy(attr->name, channel_name, sizeof(attr->name));
1609
1610 ret = cmd_enable_channel(session, domain, attr, wpipe);
1611 if (ret != LTTNG_OK) {
1612 free(attr);
1613 goto error;
1614 }
1615 free(attr);
1616
1617 /* Get the newly created channel reference back */
1618 uchan = trace_ust_find_channel_by_name(
1619 usess->domain_global.channels, channel_name);
1620 assert(uchan);
1621 }
1622
1623 /* At this point, the session and channel exist on the tracer */
1624
1625 switch (event_type) {
1626 case LTTNG_EVENT_ALL:
1627 case LTTNG_EVENT_TRACEPOINT:
1628 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1629 if (ret != LTTNG_OK) {
1630 goto error;
1631 }
1632 break;
1633 default:
1634 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1635 goto error;
1636 }
1637
1638 /* Manage return value */
1639 if (ret != LTTNG_OK) {
1640 goto error;
1641 }
1642
1643 break;
1644 }
1645 case LTTNG_DOMAIN_JUL:
1646 {
1647 struct lttng_event uevent, event;
1648 struct lttng_domain tmp_dom;
1649 struct ltt_ust_session *usess = session->ust_session;
1650
1651 assert(usess);
1652
1653 /* Create the default JUL tracepoint. */
1654 uevent.type = LTTNG_EVENT_TRACEPOINT;
1655 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1656 if (is_root) {
1657 strncpy(uevent.name, DEFAULT_SYS_JUL_EVENT_NAME,
1658 sizeof(uevent.name));
1659 } else {
1660 strncpy(uevent.name, DEFAULT_USER_JUL_EVENT_NAME,
1661 sizeof(uevent.name));
1662 }
1663 uevent.name[sizeof(uevent.name) - 1] = '\0';
1664
1665 /*
1666 * The domain type is changed because we are about to enable the
1667 * default channel and event for the JUL domain that are hardcoded.
1668 * This happens in the UST domain.
1669 */
1670 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1671 tmp_dom.type = LTTNG_DOMAIN_UST;
1672
1673 ret = cmd_enable_event(session, &tmp_dom, DEFAULT_JUL_CHANNEL_NAME,
1674 &uevent, NULL, NULL, wpipe);
1675 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1676 goto error;
1677 }
1678
1679 event.loglevel = LTTNG_LOGLEVEL_JUL_ALL;
1680 event.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1681 strncpy(event.name, "*", sizeof(event.name));
1682 event.name[sizeof(event.name) - 1] = '\0';
1683
1684 ret = event_jul_enable_all(usess, &event, filter);
1685 if (ret != LTTNG_OK) {
1686 goto error;
1687 }
1688
1689 break;
1690 }
1691 #if 0
1692 case LTTNG_DOMAIN_UST_EXEC_NAME:
1693 case LTTNG_DOMAIN_UST_PID:
1694 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1695 #endif
1696 default:
1697 ret = LTTNG_ERR_UND;
1698 goto error;
1699 }
1700
1701 ret = LTTNG_OK;
1702
1703 error:
1704 rcu_read_unlock();
1705 return ret;
1706 }
1707
1708
1709 /*
1710 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1711 */
1712 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1713 {
1714 int ret;
1715 ssize_t nb_events = 0;
1716
1717 switch (domain) {
1718 case LTTNG_DOMAIN_KERNEL:
1719 nb_events = kernel_list_events(kernel_tracer_fd, events);
1720 if (nb_events < 0) {
1721 ret = LTTNG_ERR_KERN_LIST_FAIL;
1722 goto error;
1723 }
1724 break;
1725 case LTTNG_DOMAIN_UST:
1726 nb_events = ust_app_list_events(events);
1727 if (nb_events < 0) {
1728 ret = LTTNG_ERR_UST_LIST_FAIL;
1729 goto error;
1730 }
1731 break;
1732 case LTTNG_DOMAIN_JUL:
1733 nb_events = jul_list_events(events);
1734 if (nb_events < 0) {
1735 ret = LTTNG_ERR_UST_LIST_FAIL;
1736 goto error;
1737 }
1738 break;
1739 default:
1740 ret = LTTNG_ERR_UND;
1741 goto error;
1742 }
1743
1744 return nb_events;
1745
1746 error:
1747 /* Return negative value to differentiate return code */
1748 return -ret;
1749 }
1750
1751 /*
1752 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1753 */
1754 ssize_t cmd_list_tracepoint_fields(int domain,
1755 struct lttng_event_field **fields)
1756 {
1757 int ret;
1758 ssize_t nb_fields = 0;
1759
1760 switch (domain) {
1761 case LTTNG_DOMAIN_UST:
1762 nb_fields = ust_app_list_event_fields(fields);
1763 if (nb_fields < 0) {
1764 ret = LTTNG_ERR_UST_LIST_FAIL;
1765 goto error;
1766 }
1767 break;
1768 case LTTNG_DOMAIN_KERNEL:
1769 default: /* fall-through */
1770 ret = LTTNG_ERR_UND;
1771 goto error;
1772 }
1773
1774 return nb_fields;
1775
1776 error:
1777 /* Return negative value to differentiate return code */
1778 return -ret;
1779 }
1780
1781 /*
1782 * Command LTTNG_START_TRACE processed by the client thread.
1783 */
1784 int cmd_start_trace(struct ltt_session *session)
1785 {
1786 int ret;
1787 unsigned long nb_chan = 0;
1788 struct ltt_kernel_session *ksession;
1789 struct ltt_ust_session *usess;
1790
1791 assert(session);
1792
1793 /* Ease our life a bit ;) */
1794 ksession = session->kernel_session;
1795 usess = session->ust_session;
1796
1797 /* Is the session already started? */
1798 if (session->active) {
1799 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1800 goto error;
1801 }
1802
1803 /*
1804 * Starting a session without channel is useless since after that it's not
1805 * possible to enable channel thus inform the client.
1806 */
1807 if (usess && usess->domain_global.channels) {
1808 rcu_read_lock();
1809 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1810 rcu_read_unlock();
1811 }
1812 if (ksession) {
1813 nb_chan += ksession->channel_count;
1814 }
1815 if (!nb_chan) {
1816 ret = LTTNG_ERR_NO_CHANNEL;
1817 goto error;
1818 }
1819
1820 /* Kernel tracing */
1821 if (ksession != NULL) {
1822 ret = start_kernel_session(ksession, kernel_tracer_fd);
1823 if (ret != LTTNG_OK) {
1824 goto error;
1825 }
1826 }
1827
1828 /* Flag session that trace should start automatically */
1829 if (usess) {
1830 usess->start_trace = 1;
1831
1832 ret = ust_app_start_trace_all(usess);
1833 if (ret < 0) {
1834 ret = LTTNG_ERR_UST_START_FAIL;
1835 goto error;
1836 }
1837 }
1838
1839 /* Flag this after a successful start. */
1840 session->has_been_started = 1;
1841 session->active = 1;
1842
1843 ret = LTTNG_OK;
1844
1845 error:
1846 return ret;
1847 }
1848
1849 /*
1850 * Command LTTNG_STOP_TRACE processed by the client thread.
1851 */
1852 int cmd_stop_trace(struct ltt_session *session)
1853 {
1854 int ret;
1855 struct ltt_kernel_channel *kchan;
1856 struct ltt_kernel_session *ksession;
1857 struct ltt_ust_session *usess;
1858
1859 assert(session);
1860
1861 /* Short cut */
1862 ksession = session->kernel_session;
1863 usess = session->ust_session;
1864
1865 /* Session is not active. Skip everythong and inform the client. */
1866 if (!session->active) {
1867 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1868 goto error;
1869 }
1870
1871 /* Kernel tracer */
1872 if (ksession && ksession->started) {
1873 DBG("Stop kernel tracing");
1874
1875 /* Flush metadata if exist */
1876 if (ksession->metadata_stream_fd >= 0) {
1877 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1878 if (ret < 0) {
1879 ERR("Kernel metadata flush failed");
1880 }
1881 }
1882
1883 /* Flush all buffers before stopping */
1884 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1885 ret = kernel_flush_buffer(kchan);
1886 if (ret < 0) {
1887 ERR("Kernel flush buffer error");
1888 }
1889 }
1890
1891 ret = kernel_stop_session(ksession);
1892 if (ret < 0) {
1893 ret = LTTNG_ERR_KERN_STOP_FAIL;
1894 goto error;
1895 }
1896
1897 kernel_wait_quiescent(kernel_tracer_fd);
1898
1899 ksession->started = 0;
1900 }
1901
1902 if (usess && usess->start_trace) {
1903 usess->start_trace = 0;
1904
1905 ret = ust_app_stop_trace_all(usess);
1906 if (ret < 0) {
1907 ret = LTTNG_ERR_UST_STOP_FAIL;
1908 goto error;
1909 }
1910 }
1911
1912 /* Flag inactive after a successful stop. */
1913 session->active = 0;
1914 ret = LTTNG_OK;
1915
1916 error:
1917 return ret;
1918 }
1919
1920 /*
1921 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1922 */
1923 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1924 size_t nb_uri, struct lttng_uri *uris)
1925 {
1926 int ret, i;
1927 struct ltt_kernel_session *ksess = session->kernel_session;
1928 struct ltt_ust_session *usess = session->ust_session;
1929 struct consumer_output *consumer = NULL;
1930
1931 assert(session);
1932 assert(uris);
1933 assert(nb_uri > 0);
1934
1935 /* Can't set consumer URI if the session is active. */
1936 if (session->active) {
1937 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1938 goto error;
1939 }
1940
1941 /*
1942 * This case switch makes sure the domain session has a temporary consumer
1943 * so the URL can be set.
1944 */
1945 switch (domain) {
1946 case 0:
1947 /* Code flow error. A session MUST always have a consumer object */
1948 assert(session->consumer);
1949 /*
1950 * The URL will be added to the tracing session consumer instead of a
1951 * specific domain consumer.
1952 */
1953 consumer = session->consumer;
1954 break;
1955 case LTTNG_DOMAIN_KERNEL:
1956 /* Code flow error if we don't have a kernel session here. */
1957 assert(ksess);
1958 assert(ksess->consumer);
1959 consumer = ksess->consumer;
1960 break;
1961 case LTTNG_DOMAIN_UST:
1962 /* Code flow error if we don't have a kernel session here. */
1963 assert(usess);
1964 assert(usess->consumer);
1965 consumer = usess->consumer;
1966 break;
1967 }
1968
1969 for (i = 0; i < nb_uri; i++) {
1970 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1971 if (ret != LTTNG_OK) {
1972 goto error;
1973 }
1974 }
1975
1976 /*
1977 * Make sure to set the session in output mode after we set URI since a
1978 * session can be created without URL (thus flagged in no output mode).
1979 */
1980 session->output_traces = 1;
1981 if (ksess) {
1982 ksess->output_traces = 1;
1983 } else if (usess) {
1984 usess->output_traces = 1;
1985 }
1986
1987 /* All good! */
1988 ret = LTTNG_OK;
1989
1990 error:
1991 return ret;
1992 }
1993
1994 /*
1995 * Command LTTNG_CREATE_SESSION processed by the client thread.
1996 */
1997 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1998 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
1999 {
2000 int ret;
2001 struct ltt_session *session;
2002
2003 assert(name);
2004 assert(creds);
2005
2006 /*
2007 * Verify if the session already exist
2008 *
2009 * XXX: There is no need for the session lock list here since the caller
2010 * (process_client_msg) is holding it. We might want to change that so a
2011 * single command does not lock the entire session list.
2012 */
2013 session = session_find_by_name(name);
2014 if (session != NULL) {
2015 ret = LTTNG_ERR_EXIST_SESS;
2016 goto find_error;
2017 }
2018
2019 /* Create tracing session in the registry */
2020 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2021 LTTNG_SOCK_GET_GID_CRED(creds));
2022 if (ret != LTTNG_OK) {
2023 goto session_error;
2024 }
2025
2026 /*
2027 * Get the newly created session pointer back
2028 *
2029 * XXX: There is no need for the session lock list here since the caller
2030 * (process_client_msg) is holding it. We might want to change that so a
2031 * single command does not lock the entire session list.
2032 */
2033 session = session_find_by_name(name);
2034 assert(session);
2035
2036 session->live_timer = live_timer;
2037 /* Create default consumer output for the session not yet created. */
2038 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2039 if (session->consumer == NULL) {
2040 ret = LTTNG_ERR_FATAL;
2041 goto consumer_error;
2042 }
2043
2044 if (uris) {
2045 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2046 if (ret != LTTNG_OK) {
2047 goto consumer_error;
2048 }
2049 session->output_traces = 1;
2050 } else {
2051 session->output_traces = 0;
2052 DBG2("Session %s created with no output", session->name);
2053 }
2054
2055 session->consumer->enabled = 1;
2056
2057 return LTTNG_OK;
2058
2059 consumer_error:
2060 session_destroy(session);
2061 session_error:
2062 find_error:
2063 return ret;
2064 }
2065
2066 /*
2067 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2068 */
2069 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2070 size_t nb_uri, lttng_sock_cred *creds)
2071 {
2072 int ret;
2073 struct ltt_session *session;
2074 struct snapshot_output *new_output = NULL;
2075
2076 assert(name);
2077 assert(creds);
2078
2079 /*
2080 * Create session in no output mode with URIs set to NULL. The uris we've
2081 * received are for a default snapshot output if one.
2082 */
2083 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2084 if (ret != LTTNG_OK) {
2085 goto error;
2086 }
2087
2088 /* Get the newly created session pointer back. This should NEVER fail. */
2089 session = session_find_by_name(name);
2090 assert(session);
2091
2092 /* Flag session for snapshot mode. */
2093 session->snapshot_mode = 1;
2094
2095 /* Skip snapshot output creation if no URI is given. */
2096 if (nb_uri == 0) {
2097 goto end;
2098 }
2099
2100 new_output = snapshot_output_alloc();
2101 if (!new_output) {
2102 ret = LTTNG_ERR_NOMEM;
2103 goto error_snapshot_alloc;
2104 }
2105
2106 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2107 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2108 if (ret < 0) {
2109 if (ret == -ENOMEM) {
2110 ret = LTTNG_ERR_NOMEM;
2111 } else {
2112 ret = LTTNG_ERR_INVALID;
2113 }
2114 goto error_snapshot;
2115 }
2116
2117 rcu_read_lock();
2118 snapshot_add_output(&session->snapshot, new_output);
2119 rcu_read_unlock();
2120
2121 end:
2122 return LTTNG_OK;
2123
2124 error_snapshot:
2125 snapshot_output_destroy(new_output);
2126 error_snapshot_alloc:
2127 session_destroy(session);
2128 error:
2129 return ret;
2130 }
2131
2132 /*
2133 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2134 */
2135 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2136 {
2137 int ret;
2138 struct ltt_ust_session *usess;
2139 struct ltt_kernel_session *ksess;
2140
2141 /* Safety net */
2142 assert(session);
2143
2144 usess = session->ust_session;
2145 ksess = session->kernel_session;
2146
2147 /* Clean kernel session teardown */
2148 kernel_destroy_session(ksess);
2149
2150 /* UST session teardown */
2151 if (usess) {
2152 /* Close any relayd session */
2153 consumer_output_send_destroy_relayd(usess->consumer);
2154
2155 /* Destroy every UST application related to this session. */
2156 ret = ust_app_destroy_trace_all(usess);
2157 if (ret) {
2158 ERR("Error in ust_app_destroy_trace_all");
2159 }
2160
2161 /* Clean up the rest. */
2162 trace_ust_destroy_session(usess);
2163 }
2164
2165 /*
2166 * Must notify the kernel thread here to update it's poll set in order to
2167 * remove the channel(s)' fd just destroyed.
2168 */
2169 ret = notify_thread_pipe(wpipe);
2170 if (ret < 0) {
2171 PERROR("write kernel poll pipe");
2172 }
2173
2174 ret = session_destroy(session);
2175
2176 return ret;
2177 }
2178
2179 /*
2180 * Command LTTNG_CALIBRATE processed by the client thread.
2181 */
2182 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2183 {
2184 int ret;
2185
2186 switch (domain) {
2187 case LTTNG_DOMAIN_KERNEL:
2188 {
2189 struct lttng_kernel_calibrate kcalibrate;
2190
2191 switch (calibrate->type) {
2192 case LTTNG_CALIBRATE_FUNCTION:
2193 default:
2194 /* Default and only possible calibrate option. */
2195 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2196 break;
2197 }
2198
2199 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2200 if (ret < 0) {
2201 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2202 goto error;
2203 }
2204 break;
2205 }
2206 case LTTNG_DOMAIN_UST:
2207 {
2208 struct lttng_ust_calibrate ucalibrate;
2209
2210 switch (calibrate->type) {
2211 case LTTNG_CALIBRATE_FUNCTION:
2212 default:
2213 /* Default and only possible calibrate option. */
2214 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2215 break;
2216 }
2217
2218 ret = ust_app_calibrate_glb(&ucalibrate);
2219 if (ret < 0) {
2220 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2221 goto error;
2222 }
2223 break;
2224 }
2225 default:
2226 ret = LTTNG_ERR_UND;
2227 goto error;
2228 }
2229
2230 ret = LTTNG_OK;
2231
2232 error:
2233 return ret;
2234 }
2235
2236 /*
2237 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2238 */
2239 int cmd_register_consumer(struct ltt_session *session, int domain,
2240 const char *sock_path, struct consumer_data *cdata)
2241 {
2242 int ret, sock;
2243 struct consumer_socket *socket = NULL;
2244
2245 assert(session);
2246 assert(cdata);
2247 assert(sock_path);
2248
2249 switch (domain) {
2250 case LTTNG_DOMAIN_KERNEL:
2251 {
2252 struct ltt_kernel_session *ksess = session->kernel_session;
2253
2254 assert(ksess);
2255
2256 /* Can't register a consumer if there is already one */
2257 if (ksess->consumer_fds_sent != 0) {
2258 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2259 goto error;
2260 }
2261
2262 sock = lttcomm_connect_unix_sock(sock_path);
2263 if (sock < 0) {
2264 ret = LTTNG_ERR_CONNECT_FAIL;
2265 goto error;
2266 }
2267 cdata->cmd_sock = sock;
2268
2269 socket = consumer_allocate_socket(&cdata->cmd_sock);
2270 if (socket == NULL) {
2271 ret = close(sock);
2272 if (ret < 0) {
2273 PERROR("close register consumer");
2274 }
2275 cdata->cmd_sock = -1;
2276 ret = LTTNG_ERR_FATAL;
2277 goto error;
2278 }
2279
2280 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2281 if (socket->lock == NULL) {
2282 PERROR("zmalloc pthread mutex");
2283 ret = LTTNG_ERR_FATAL;
2284 goto error;
2285 }
2286 pthread_mutex_init(socket->lock, NULL);
2287 socket->registered = 1;
2288
2289 rcu_read_lock();
2290 consumer_add_socket(socket, ksess->consumer);
2291 rcu_read_unlock();
2292
2293 pthread_mutex_lock(&cdata->pid_mutex);
2294 cdata->pid = -1;
2295 pthread_mutex_unlock(&cdata->pid_mutex);
2296
2297 break;
2298 }
2299 default:
2300 /* TODO: Userspace tracing */
2301 ret = LTTNG_ERR_UND;
2302 goto error;
2303 }
2304
2305 return LTTNG_OK;
2306
2307 error:
2308 if (socket) {
2309 consumer_destroy_socket(socket);
2310 }
2311 return ret;
2312 }
2313
2314 /*
2315 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2316 */
2317 ssize_t cmd_list_domains(struct ltt_session *session,
2318 struct lttng_domain **domains)
2319 {
2320 int ret, index = 0;
2321 ssize_t nb_dom = 0;
2322
2323 if (session->kernel_session != NULL) {
2324 DBG3("Listing domains found kernel domain");
2325 nb_dom++;
2326 }
2327
2328 if (session->ust_session != NULL) {
2329 DBG3("Listing domains found UST global domain");
2330 nb_dom++;
2331
2332 if (session->ust_session->domain_jul.being_used) {
2333 nb_dom++;
2334 }
2335 }
2336
2337 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2338 if (*domains == NULL) {
2339 ret = LTTNG_ERR_FATAL;
2340 goto error;
2341 }
2342
2343 if (session->kernel_session != NULL) {
2344 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2345 index++;
2346 }
2347
2348 if (session->ust_session != NULL) {
2349 (*domains)[index].type = LTTNG_DOMAIN_UST;
2350 (*domains)[index].buf_type = session->ust_session->buffer_type;
2351 index++;
2352
2353 if (session->ust_session->domain_jul.being_used) {
2354 (*domains)[index].type = LTTNG_DOMAIN_JUL;
2355 (*domains)[index].buf_type = session->ust_session->buffer_type;
2356 index++;
2357 }
2358 }
2359
2360 return nb_dom;
2361
2362 error:
2363 /* Return negative value to differentiate return code */
2364 return -ret;
2365 }
2366
2367
2368 /*
2369 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2370 */
2371 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2372 struct lttng_channel **channels)
2373 {
2374 int ret;
2375 ssize_t nb_chan = 0;
2376
2377 switch (domain) {
2378 case LTTNG_DOMAIN_KERNEL:
2379 if (session->kernel_session != NULL) {
2380 nb_chan = session->kernel_session->channel_count;
2381 }
2382 DBG3("Number of kernel channels %zd", nb_chan);
2383 if (nb_chan <= 0) {
2384 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2385 }
2386 break;
2387 case LTTNG_DOMAIN_UST:
2388 if (session->ust_session != NULL) {
2389 nb_chan = lttng_ht_get_count(
2390 session->ust_session->domain_global.channels);
2391 }
2392 DBG3("Number of UST global channels %zd", nb_chan);
2393 if (nb_chan < 0) {
2394 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2395 goto error;
2396 }
2397 break;
2398 default:
2399 ret = LTTNG_ERR_UND;
2400 goto error;
2401 }
2402
2403 if (nb_chan > 0) {
2404 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2405 if (*channels == NULL) {
2406 ret = LTTNG_ERR_FATAL;
2407 goto error;
2408 }
2409
2410 list_lttng_channels(domain, session, *channels);
2411 }
2412
2413 return nb_chan;
2414
2415 error:
2416 /* Return negative value to differentiate return code */
2417 return -ret;
2418 }
2419
2420 /*
2421 * Command LTTNG_LIST_EVENTS processed by the client thread.
2422 */
2423 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2424 char *channel_name, struct lttng_event **events)
2425 {
2426 int ret = 0;
2427 ssize_t nb_event = 0;
2428
2429 switch (domain) {
2430 case LTTNG_DOMAIN_KERNEL:
2431 if (session->kernel_session != NULL) {
2432 nb_event = list_lttng_kernel_events(channel_name,
2433 session->kernel_session, events);
2434 }
2435 break;
2436 case LTTNG_DOMAIN_UST:
2437 {
2438 if (session->ust_session != NULL) {
2439 nb_event = list_lttng_ust_global_events(channel_name,
2440 &session->ust_session->domain_global, events);
2441 }
2442 break;
2443 }
2444 case LTTNG_DOMAIN_JUL:
2445 if (session->ust_session) {
2446 nb_event = list_lttng_jul_events(
2447 &session->ust_session->domain_jul, events);
2448 }
2449 break;
2450 default:
2451 ret = LTTNG_ERR_UND;
2452 goto error;
2453 }
2454
2455 return nb_event;
2456
2457 error:
2458 /* Return negative value to differentiate return code */
2459 return -ret;
2460 }
2461
2462 /*
2463 * Using the session list, filled a lttng_session array to send back to the
2464 * client for session listing.
2465 *
2466 * The session list lock MUST be acquired before calling this function. Use
2467 * session_lock_list() and session_unlock_list().
2468 */
2469 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2470 gid_t gid)
2471 {
2472 int ret;
2473 unsigned int i = 0;
2474 struct ltt_session *session;
2475 struct ltt_session_list *list = session_get_list();
2476
2477 DBG("Getting all available session for UID %d GID %d",
2478 uid, gid);
2479 /*
2480 * Iterate over session list and append data after the control struct in
2481 * the buffer.
2482 */
2483 cds_list_for_each_entry(session, &list->head, list) {
2484 /*
2485 * Only list the sessions the user can control.
2486 */
2487 if (!session_access_ok(session, uid, gid)) {
2488 continue;
2489 }
2490
2491 struct ltt_kernel_session *ksess = session->kernel_session;
2492 struct ltt_ust_session *usess = session->ust_session;
2493
2494 if (session->consumer->type == CONSUMER_DST_NET ||
2495 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2496 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2497 ret = build_network_session_path(sessions[i].path,
2498 sizeof(sessions[i].path), session);
2499 } else {
2500 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2501 session->consumer->dst.trace_path);
2502 }
2503 if (ret < 0) {
2504 PERROR("snprintf session path");
2505 continue;
2506 }
2507
2508 strncpy(sessions[i].name, session->name, NAME_MAX);
2509 sessions[i].name[NAME_MAX - 1] = '\0';
2510 sessions[i].enabled = session->active;
2511 sessions[i].snapshot_mode = session->snapshot_mode;
2512 sessions[i].live_timer_interval = session->live_timer;
2513 i++;
2514 }
2515 }
2516
2517 /*
2518 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2519 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2520 */
2521 int cmd_data_pending(struct ltt_session *session)
2522 {
2523 int ret;
2524 struct ltt_kernel_session *ksess = session->kernel_session;
2525 struct ltt_ust_session *usess = session->ust_session;
2526
2527 assert(session);
2528
2529 /* Session MUST be stopped to ask for data availability. */
2530 if (session->active) {
2531 ret = LTTNG_ERR_SESSION_STARTED;
2532 goto error;
2533 } else {
2534 /*
2535 * If stopped, just make sure we've started before else the above call
2536 * will always send that there is data pending.
2537 *
2538 * The consumer assumes that when the data pending command is received,
2539 * the trace has been started before or else no output data is written
2540 * by the streams which is a condition for data pending. So, this is
2541 * *VERY* important that we don't ask the consumer before a start
2542 * trace.
2543 */
2544 if (!session->has_been_started) {
2545 ret = 0;
2546 goto error;
2547 }
2548 }
2549
2550 if (ksess && ksess->consumer) {
2551 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2552 if (ret == 1) {
2553 /* Data is still being extracted for the kernel. */
2554 goto error;
2555 }
2556 }
2557
2558 if (usess && usess->consumer) {
2559 ret = consumer_is_data_pending(usess->id, usess->consumer);
2560 if (ret == 1) {
2561 /* Data is still being extracted for the kernel. */
2562 goto error;
2563 }
2564 }
2565
2566 /* Data is ready to be read by a viewer */
2567 ret = 0;
2568
2569 error:
2570 return ret;
2571 }
2572
2573 /*
2574 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2575 *
2576 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2577 */
2578 int cmd_snapshot_add_output(struct ltt_session *session,
2579 struct lttng_snapshot_output *output, uint32_t *id)
2580 {
2581 int ret;
2582 struct snapshot_output *new_output;
2583
2584 assert(session);
2585 assert(output);
2586
2587 DBG("Cmd snapshot add output for session %s", session->name);
2588
2589 /*
2590 * Permission denied to create an output if the session is not
2591 * set in no output mode.
2592 */
2593 if (session->output_traces) {
2594 ret = LTTNG_ERR_EPERM;
2595 goto error;
2596 }
2597
2598 /* Only one output is allowed until we have the "tee" feature. */
2599 if (session->snapshot.nb_output == 1) {
2600 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2601 goto error;
2602 }
2603
2604 new_output = snapshot_output_alloc();
2605 if (!new_output) {
2606 ret = LTTNG_ERR_NOMEM;
2607 goto error;
2608 }
2609
2610 ret = snapshot_output_init(output->max_size, output->name,
2611 output->ctrl_url, output->data_url, session->consumer, new_output,
2612 &session->snapshot);
2613 if (ret < 0) {
2614 if (ret == -ENOMEM) {
2615 ret = LTTNG_ERR_NOMEM;
2616 } else {
2617 ret = LTTNG_ERR_INVALID;
2618 }
2619 goto free_error;
2620 }
2621
2622 rcu_read_lock();
2623 snapshot_add_output(&session->snapshot, new_output);
2624 if (id) {
2625 *id = new_output->id;
2626 }
2627 rcu_read_unlock();
2628
2629 return LTTNG_OK;
2630
2631 free_error:
2632 snapshot_output_destroy(new_output);
2633 error:
2634 return ret;
2635 }
2636
2637 /*
2638 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2639 *
2640 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2641 */
2642 int cmd_snapshot_del_output(struct ltt_session *session,
2643 struct lttng_snapshot_output *output)
2644 {
2645 int ret;
2646 struct snapshot_output *sout = NULL;
2647
2648 assert(session);
2649 assert(output);
2650
2651 rcu_read_lock();
2652
2653 /*
2654 * Permission denied to create an output if the session is not
2655 * set in no output mode.
2656 */
2657 if (session->output_traces) {
2658 ret = LTTNG_ERR_EPERM;
2659 goto error;
2660 }
2661
2662 if (output->id) {
2663 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2664 session->name);
2665 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2666 } else if (*output->name != '\0') {
2667 DBG("Cmd snapshot del output name %s for session %s", output->name,
2668 session->name);
2669 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2670 }
2671 if (!sout) {
2672 ret = LTTNG_ERR_INVALID;
2673 goto error;
2674 }
2675
2676 snapshot_delete_output(&session->snapshot, sout);
2677 snapshot_output_destroy(sout);
2678 ret = LTTNG_OK;
2679
2680 error:
2681 rcu_read_unlock();
2682 return ret;
2683 }
2684
2685 /*
2686 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2687 *
2688 * If no output is available, outputs is untouched and 0 is returned.
2689 *
2690 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2691 */
2692 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2693 struct lttng_snapshot_output **outputs)
2694 {
2695 int ret, idx = 0;
2696 struct lttng_snapshot_output *list = NULL;
2697 struct lttng_ht_iter iter;
2698 struct snapshot_output *output;
2699
2700 assert(session);
2701 assert(outputs);
2702
2703 DBG("Cmd snapshot list outputs for session %s", session->name);
2704
2705 /*
2706 * Permission denied to create an output if the session is not
2707 * set in no output mode.
2708 */
2709 if (session->output_traces) {
2710 ret = -LTTNG_ERR_EPERM;
2711 goto error;
2712 }
2713
2714 if (session->snapshot.nb_output == 0) {
2715 ret = 0;
2716 goto error;
2717 }
2718
2719 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2720 if (!list) {
2721 ret = -LTTNG_ERR_NOMEM;
2722 goto error;
2723 }
2724
2725 /* Copy list from session to the new list object. */
2726 rcu_read_lock();
2727 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2728 output, node.node) {
2729 assert(output->consumer);
2730 list[idx].id = output->id;
2731 list[idx].max_size = output->max_size;
2732 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2733 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2734 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2735 sizeof(list[idx].ctrl_url));
2736 } else {
2737 /* Control URI. */
2738 ret = uri_to_str_url(&output->consumer->dst.net.control,
2739 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2740 if (ret < 0) {
2741 ret = -LTTNG_ERR_NOMEM;
2742 goto error;
2743 }
2744
2745 /* Data URI. */
2746 ret = uri_to_str_url(&output->consumer->dst.net.data,
2747 list[idx].data_url, sizeof(list[idx].data_url));
2748 if (ret < 0) {
2749 ret = -LTTNG_ERR_NOMEM;
2750 goto error;
2751 }
2752 }
2753 idx++;
2754 }
2755
2756 *outputs = list;
2757 list = NULL;
2758 ret = session->snapshot.nb_output;
2759 error:
2760 free(list);
2761 rcu_read_unlock();
2762 return ret;
2763 }
2764
2765 /*
2766 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2767 * snapshot output is *not* set with a remote destination.
2768 *
2769 * Return 0 on success or a LTTNG_ERR code.
2770 */
2771 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2772 struct snapshot_output *snap_output, struct ltt_session *session)
2773 {
2774 int ret = LTTNG_OK;
2775 struct lttng_ht_iter iter;
2776 struct consumer_socket *socket;
2777
2778 assert(consumer);
2779 assert(snap_output);
2780 assert(session);
2781
2782 DBG2("Set relayd object from snapshot output");
2783
2784 /* Ignore if snapshot consumer output is not network. */
2785 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2786 goto error;
2787 }
2788
2789 /*
2790 * For each consumer socket, create and send the relayd object of the
2791 * snapshot output.
2792 */
2793 rcu_read_lock();
2794 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2795 socket, node.node) {
2796 ret = send_consumer_relayd_sockets(0, session->id,
2797 snap_output->consumer, socket,
2798 session->name, session->hostname,
2799 session->live_timer);
2800 if (ret != LTTNG_OK) {
2801 rcu_read_unlock();
2802 goto error;
2803 }
2804 }
2805 rcu_read_unlock();
2806
2807 error:
2808 return ret;
2809 }
2810
2811 /*
2812 * Record a kernel snapshot.
2813 *
2814 * Return LTTNG_OK on success or a LTTNG_ERR code.
2815 */
2816 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2817 struct snapshot_output *output, struct ltt_session *session,
2818 int wait, int nb_streams)
2819 {
2820 int ret;
2821
2822 assert(ksess);
2823 assert(output);
2824 assert(session);
2825
2826 /* Get the datetime for the snapshot output directory. */
2827 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2828 sizeof(output->datetime));
2829 if (!ret) {
2830 ret = LTTNG_ERR_INVALID;
2831 goto error;
2832 }
2833
2834 /*
2835 * Copy kernel session sockets so we can communicate with the right
2836 * consumer for the snapshot record command.
2837 */
2838 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2839 if (ret < 0) {
2840 ret = LTTNG_ERR_NOMEM;
2841 goto error;
2842 }
2843
2844 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2845 if (ret != LTTNG_OK) {
2846 goto error_snapshot;
2847 }
2848
2849 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2850 if (ret != LTTNG_OK) {
2851 goto error_snapshot;
2852 }
2853
2854 ret = LTTNG_OK;
2855
2856 error_snapshot:
2857 /* Clean up copied sockets so this output can use some other later on. */
2858 consumer_destroy_output_sockets(output->consumer);
2859 error:
2860 return ret;
2861 }
2862
2863 /*
2864 * Record a UST snapshot.
2865 *
2866 * Return 0 on success or a LTTNG_ERR error code.
2867 */
2868 static int record_ust_snapshot(struct ltt_ust_session *usess,
2869 struct snapshot_output *output, struct ltt_session *session,
2870 int wait, int nb_streams)
2871 {
2872 int ret;
2873
2874 assert(usess);
2875 assert(output);
2876 assert(session);
2877
2878 /* Get the datetime for the snapshot output directory. */
2879 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2880 sizeof(output->datetime));
2881 if (!ret) {
2882 ret = LTTNG_ERR_INVALID;
2883 goto error;
2884 }
2885
2886 /*
2887 * Copy UST session sockets so we can communicate with the right
2888 * consumer for the snapshot record command.
2889 */
2890 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2891 if (ret < 0) {
2892 ret = LTTNG_ERR_NOMEM;
2893 goto error;
2894 }
2895
2896 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2897 if (ret != LTTNG_OK) {
2898 goto error_snapshot;
2899 }
2900
2901 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2902 if (ret < 0) {
2903 switch (-ret) {
2904 case EINVAL:
2905 ret = LTTNG_ERR_INVALID;
2906 break;
2907 case ENODATA:
2908 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2909 break;
2910 default:
2911 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2912 break;
2913 }
2914 goto error_snapshot;
2915 }
2916
2917 ret = LTTNG_OK;
2918
2919 error_snapshot:
2920 /* Clean up copied sockets so this output can use some other later on. */
2921 consumer_destroy_output_sockets(output->consumer);
2922 error:
2923 return ret;
2924 }
2925
2926 /*
2927 * Returns the total number of streams for a session or a negative value
2928 * on error.
2929 */
2930 static unsigned int get_total_nb_stream(struct ltt_session *session)
2931 {
2932 unsigned int total_streams = 0;
2933
2934 if (session->kernel_session) {
2935 struct ltt_kernel_session *ksess = session->kernel_session;
2936
2937 total_streams += ksess->stream_count_global;
2938 }
2939
2940 if (session->ust_session) {
2941 struct ltt_ust_session *usess = session->ust_session;
2942
2943 total_streams += ust_app_get_nb_stream(usess);
2944 }
2945
2946 return total_streams;
2947 }
2948
2949 /*
2950 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2951 *
2952 * The wait parameter is ignored so this call always wait for the snapshot to
2953 * complete before returning.
2954 *
2955 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2956 */
2957 int cmd_snapshot_record(struct ltt_session *session,
2958 struct lttng_snapshot_output *output, int wait)
2959 {
2960 int ret = LTTNG_OK;
2961 unsigned int use_tmp_output = 0;
2962 struct snapshot_output tmp_output;
2963 unsigned int nb_streams, snapshot_success = 0;
2964
2965 assert(session);
2966
2967 DBG("Cmd snapshot record for session %s", session->name);
2968
2969 /*
2970 * Permission denied to create an output if the session is not
2971 * set in no output mode.
2972 */
2973 if (session->output_traces) {
2974 ret = LTTNG_ERR_EPERM;
2975 goto error;
2976 }
2977
2978 /* The session needs to be started at least once. */
2979 if (!session->has_been_started) {
2980 ret = LTTNG_ERR_START_SESSION_ONCE;
2981 goto error;
2982 }
2983
2984 /* Use temporary output for the session. */
2985 if (output && *output->ctrl_url != '\0') {
2986 ret = snapshot_output_init(output->max_size, output->name,
2987 output->ctrl_url, output->data_url, session->consumer,
2988 &tmp_output, NULL);
2989 if (ret < 0) {
2990 if (ret == -ENOMEM) {
2991 ret = LTTNG_ERR_NOMEM;
2992 } else {
2993 ret = LTTNG_ERR_INVALID;
2994 }
2995 goto error;
2996 }
2997 /* Use the global session count for the temporary snapshot. */
2998 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2999 use_tmp_output = 1;
3000 }
3001
3002 /*
3003 * Get the total number of stream of that session which is used by the
3004 * maximum size of the snapshot feature.
3005 */
3006 nb_streams = get_total_nb_stream(session);
3007
3008 if (session->kernel_session) {
3009 struct ltt_kernel_session *ksess = session->kernel_session;
3010
3011 if (use_tmp_output) {
3012 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3013 wait, nb_streams);
3014 if (ret != LTTNG_OK) {
3015 goto error;
3016 }
3017 snapshot_success = 1;
3018 } else {
3019 struct snapshot_output *sout;
3020 struct lttng_ht_iter iter;
3021
3022 rcu_read_lock();
3023 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3024 &iter.iter, sout, node.node) {
3025 /*
3026 * Make a local copy of the output and assign the possible
3027 * temporary value given by the caller.
3028 */
3029 memset(&tmp_output, 0, sizeof(tmp_output));
3030 memcpy(&tmp_output, sout, sizeof(tmp_output));
3031
3032 /* Use temporary max size. */
3033 if (output->max_size != (uint64_t) -1ULL) {
3034 tmp_output.max_size = output->max_size;
3035 }
3036
3037 /* Use temporary name. */
3038 if (*output->name != '\0') {
3039 strncpy(tmp_output.name, output->name,
3040 sizeof(tmp_output.name));
3041 }
3042
3043 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3044
3045 ret = record_kernel_snapshot(ksess, &tmp_output,
3046 session, wait, nb_streams);
3047 if (ret != LTTNG_OK) {
3048 rcu_read_unlock();
3049 goto error;
3050 }
3051 snapshot_success = 1;
3052 }
3053 rcu_read_unlock();
3054 }
3055 }
3056
3057 if (session->ust_session) {
3058 struct ltt_ust_session *usess = session->ust_session;
3059
3060 if (use_tmp_output) {
3061 ret = record_ust_snapshot(usess, &tmp_output, session,
3062 wait, nb_streams);
3063 if (ret != LTTNG_OK) {
3064 goto error;
3065 }
3066 snapshot_success = 1;
3067 } else {
3068 struct snapshot_output *sout;
3069 struct lttng_ht_iter iter;
3070
3071 rcu_read_lock();
3072 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3073 &iter.iter, sout, node.node) {
3074 /*
3075 * Make a local copy of the output and assign the possible
3076 * temporary value given by the caller.
3077 */
3078 memset(&tmp_output, 0, sizeof(tmp_output));
3079 memcpy(&tmp_output, sout, sizeof(tmp_output));
3080
3081 /* Use temporary max size. */
3082 if (output->max_size != (uint64_t) -1ULL) {
3083 tmp_output.max_size = output->max_size;
3084 }
3085
3086 /* Use temporary name. */
3087 if (*output->name != '\0') {
3088 strncpy(tmp_output.name, output->name,
3089 sizeof(tmp_output.name));
3090 }
3091
3092 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3093
3094 ret = record_ust_snapshot(usess, &tmp_output, session,
3095 wait, nb_streams);
3096 if (ret != LTTNG_OK) {
3097 rcu_read_unlock();
3098 goto error;
3099 }
3100 snapshot_success = 1;
3101 }
3102 rcu_read_unlock();
3103 }
3104 }
3105
3106 if (snapshot_success) {
3107 session->snapshot.nb_snapshot++;
3108 } else {
3109 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3110 }
3111
3112 error:
3113 return ret;
3114 }
3115
3116 /*
3117 * Init command subsystem.
3118 */
3119 void cmd_init(void)
3120 {
3121 /*
3122 * Set network sequence index to 1 for streams to match a relayd
3123 * socket on the consumer side.
3124 */
3125 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3126 relayd_net_seq_idx = 1;
3127 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3128
3129 DBG("Command subsystem initialized");
3130 }
LTTng 2.0 tools and control repository
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