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