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Introduce configure --with-lttng-system-rundir
[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 /* Code flow error */
466 assert(socket->fd >= 0);
467
468 pthread_mutex_lock(socket->lock);
469 ret = kernel_consumer_send_session(socket, session);
470 pthread_mutex_unlock(socket->lock);
471 if (ret < 0) {
472 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
473 goto error;
474 }
475 }
476 }
477
478 error:
479 rcu_read_unlock();
480 return ret;
481 }
482
483 /*
484 * Create a socket to the relayd using the URI.
485 *
486 * On success, the relayd_sock pointer is set to the created socket.
487 * Else, it's stays untouched and a lttcomm error code is returned.
488 */
489 static int create_connect_relayd(struct lttng_uri *uri,
490 struct lttcomm_relayd_sock **relayd_sock)
491 {
492 int ret;
493 struct lttcomm_relayd_sock *rsock;
494
495 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
496 RELAYD_VERSION_COMM_MINOR);
497 if (!rsock) {
498 ret = LTTNG_ERR_FATAL;
499 goto error;
500 }
501
502 /*
503 * Connect to relayd so we can proceed with a session creation. This call
504 * can possibly block for an arbitrary amount of time to set the health
505 * state to be in poll execution.
506 */
507 health_poll_entry();
508 ret = relayd_connect(rsock);
509 health_poll_exit();
510 if (ret < 0) {
511 ERR("Unable to reach lttng-relayd");
512 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
513 goto free_sock;
514 }
515
516 /* Create socket for control stream. */
517 if (uri->stype == LTTNG_STREAM_CONTROL) {
518 DBG3("Creating relayd stream socket from URI");
519
520 /* Check relayd version */
521 ret = relayd_version_check(rsock);
522 if (ret < 0) {
523 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
524 goto close_sock;
525 }
526 } else if (uri->stype == LTTNG_STREAM_DATA) {
527 DBG3("Creating relayd data socket from URI");
528 } else {
529 /* Command is not valid */
530 ERR("Relayd invalid stream type: %d", uri->stype);
531 ret = LTTNG_ERR_INVALID;
532 goto close_sock;
533 }
534
535 *relayd_sock = rsock;
536
537 return LTTNG_OK;
538
539 close_sock:
540 /* The returned value is not useful since we are on an error path. */
541 (void) relayd_close(rsock);
542 free_sock:
543 free(rsock);
544 error:
545 return ret;
546 }
547
548 /*
549 * Connect to the relayd using URI and send the socket to the right consumer.
550 */
551 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
552 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
553 struct consumer_socket *consumer_sock)
554 {
555 int ret;
556 struct lttcomm_relayd_sock *rsock = NULL;
557
558 /* Connect to relayd and make version check if uri is the control. */
559 ret = create_connect_relayd(relayd_uri, &rsock);
560 if (ret != LTTNG_OK) {
561 goto error;
562 }
563 assert(rsock);
564
565 /* Set the network sequence index if not set. */
566 if (consumer->net_seq_index == (uint64_t) -1ULL) {
567 pthread_mutex_lock(&relayd_net_seq_idx_lock);
568 /*
569 * Increment net_seq_idx because we are about to transfer the
570 * new relayd socket to the consumer.
571 * Assign unique key so the consumer can match streams.
572 */
573 consumer->net_seq_index = ++relayd_net_seq_idx;
574 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
575 }
576
577 /* Send relayd socket to consumer. */
578 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
579 relayd_uri->stype, session_id);
580 if (ret < 0) {
581 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
582 goto close_sock;
583 }
584
585 /* Flag that the corresponding socket was sent. */
586 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
587 consumer_sock->control_sock_sent = 1;
588 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
589 consumer_sock->data_sock_sent = 1;
590 }
591
592 ret = LTTNG_OK;
593
594 /*
595 * Close socket which was dup on the consumer side. The session daemon does
596 * NOT keep track of the relayd socket(s) once transfer to the consumer.
597 */
598
599 close_sock:
600 (void) relayd_close(rsock);
601 free(rsock);
602
603 error:
604 if (ret != LTTNG_OK) {
605 /*
606 * The consumer output for this session should not be used anymore
607 * since the relayd connection failed thus making any tracing or/and
608 * streaming not usable.
609 */
610 consumer->enabled = 0;
611 }
612 return ret;
613 }
614
615 /*
616 * Send both relayd sockets to a specific consumer and domain. This is a
617 * helper function to facilitate sending the information to the consumer for a
618 * session.
619 */
620 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
621 struct consumer_output *consumer, struct consumer_socket *sock)
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 if (ret != LTTNG_OK) {
633 goto error;
634 }
635 }
636
637 /* Sending data relayd socket. */
638 if (!sock->data_sock_sent) {
639 ret = send_consumer_relayd_socket(domain, session_id,
640 &consumer->dst.net.data, consumer, sock);
641 if (ret != LTTNG_OK) {
642 goto error;
643 }
644 }
645
646 error:
647 return ret;
648 }
649
650 /*
651 * Setup relayd connections for a tracing session. First creates the socket to
652 * the relayd and send them to the right domain consumer. Consumer type MUST be
653 * network.
654 */
655 int cmd_setup_relayd(struct ltt_session *session)
656 {
657 int ret = LTTNG_OK;
658 struct ltt_ust_session *usess;
659 struct ltt_kernel_session *ksess;
660 struct consumer_socket *socket;
661 struct lttng_ht_iter iter;
662
663 assert(session);
664
665 usess = session->ust_session;
666 ksess = session->kernel_session;
667
668 DBG("Setting relayd for session %s", session->name);
669
670 rcu_read_lock();
671
672 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
673 && usess->consumer->enabled) {
674 /* For each consumer socket, send relayd sockets */
675 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
676 socket, node.node) {
677 /* Code flow error */
678 assert(socket->fd >= 0);
679
680 pthread_mutex_lock(socket->lock);
681 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
682 usess->consumer, socket);
683 pthread_mutex_unlock(socket->lock);
684 if (ret != LTTNG_OK) {
685 goto error;
686 }
687 /* Session is now ready for network streaming. */
688 session->net_handle = 1;
689 }
690 }
691
692 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
693 && ksess->consumer->enabled) {
694 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
695 socket, node.node) {
696 /* Code flow error */
697 assert(socket->fd >= 0);
698
699 pthread_mutex_lock(socket->lock);
700 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
701 ksess->consumer, socket);
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 switch (domain->type) {
863 case LTTNG_DOMAIN_KERNEL:
864 {
865 struct ltt_kernel_channel *kchan;
866
867 kchan = trace_kernel_get_channel_by_name(attr->name,
868 session->kernel_session);
869 if (kchan == NULL) {
870 /*
871 * Don't try to create a channel if the session
872 * has been started at some point in time
873 * before. The tracer does not allow it.
874 */
875 if (session->started) {
876 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
877 goto error;
878 }
879 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
880 if (attr->name[0] != '\0') {
881 session->kernel_session->has_non_default_channel = 1;
882 }
883 } else {
884 ret = channel_kernel_enable(session->kernel_session, kchan);
885 }
886
887 if (ret != LTTNG_OK) {
888 goto error;
889 }
890
891 kernel_wait_quiescent(kernel_tracer_fd);
892 break;
893 }
894 case LTTNG_DOMAIN_UST:
895 {
896 struct ltt_ust_channel *uchan;
897
898 chan_ht = usess->domain_global.channels;
899
900 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
901 if (uchan == NULL) {
902 /*
903 * Don't try to create a channel if the session
904 * has been started at some point in time
905 * before. The tracer does not allow it.
906 */
907 if (session->started) {
908 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
909 goto error;
910 }
911 ret = channel_ust_create(usess, attr, domain->buf_type);
912 if (attr->name[0] != '\0') {
913 usess->has_non_default_channel = 1;
914 }
915 } else {
916 ret = channel_ust_enable(usess, uchan);
917 }
918 break;
919 }
920 default:
921 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
922 goto error;
923 }
924
925 error:
926 rcu_read_unlock();
927 return ret;
928 }
929
930
931 /*
932 * Command LTTNG_DISABLE_EVENT processed by the client thread.
933 */
934 int cmd_disable_event(struct ltt_session *session, int domain,
935 char *channel_name, char *event_name)
936 {
937 int ret;
938
939 rcu_read_lock();
940
941 switch (domain) {
942 case LTTNG_DOMAIN_KERNEL:
943 {
944 struct ltt_kernel_channel *kchan;
945 struct ltt_kernel_session *ksess;
946
947 ksess = session->kernel_session;
948
949 /*
950 * If a non-default channel has been created in the
951 * session, explicitely require that -c chan_name needs
952 * to be provided.
953 */
954 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
955 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
956 goto error;
957 }
958
959 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
960 if (kchan == NULL) {
961 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
962 goto error;
963 }
964
965 ret = event_kernel_disable_tracepoint(kchan, event_name);
966 if (ret != LTTNG_OK) {
967 goto error;
968 }
969
970 kernel_wait_quiescent(kernel_tracer_fd);
971 break;
972 }
973 case LTTNG_DOMAIN_UST:
974 {
975 struct ltt_ust_channel *uchan;
976 struct ltt_ust_session *usess;
977
978 usess = session->ust_session;
979
980 /*
981 * If a non-default channel has been created in the
982 * session, explicitely require that -c chan_name needs
983 * to be provided.
984 */
985 if (usess->has_non_default_channel && channel_name[0] == '\0') {
986 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
987 goto error;
988 }
989
990 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
991 channel_name);
992 if (uchan == NULL) {
993 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
994 goto error;
995 }
996
997 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
998 if (ret != LTTNG_OK) {
999 goto error;
1000 }
1001
1002 DBG3("Disable UST event %s in channel %s completed", event_name,
1003 channel_name);
1004 break;
1005 }
1006 #if 0
1007 case LTTNG_DOMAIN_UST_EXEC_NAME:
1008 case LTTNG_DOMAIN_UST_PID:
1009 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1010 #endif
1011 default:
1012 ret = LTTNG_ERR_UND;
1013 goto error;
1014 }
1015
1016 ret = LTTNG_OK;
1017
1018 error:
1019 rcu_read_unlock();
1020 return ret;
1021 }
1022
1023 /*
1024 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1025 */
1026 int cmd_disable_event_all(struct ltt_session *session, int domain,
1027 char *channel_name)
1028 {
1029 int ret;
1030
1031 rcu_read_lock();
1032
1033 switch (domain) {
1034 case LTTNG_DOMAIN_KERNEL:
1035 {
1036 struct ltt_kernel_session *ksess;
1037 struct ltt_kernel_channel *kchan;
1038
1039 ksess = session->kernel_session;
1040
1041 /*
1042 * If a non-default channel has been created in the
1043 * session, explicitely require that -c chan_name needs
1044 * to be provided.
1045 */
1046 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1047 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1048 goto error;
1049 }
1050
1051 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1052 if (kchan == NULL) {
1053 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1054 goto error;
1055 }
1056
1057 ret = event_kernel_disable_all(kchan);
1058 if (ret != LTTNG_OK) {
1059 goto error;
1060 }
1061
1062 kernel_wait_quiescent(kernel_tracer_fd);
1063 break;
1064 }
1065 case LTTNG_DOMAIN_UST:
1066 {
1067 struct ltt_ust_session *usess;
1068 struct ltt_ust_channel *uchan;
1069
1070 usess = session->ust_session;
1071
1072 /*
1073 * If a non-default channel has been created in the
1074 * session, explicitely require that -c chan_name needs
1075 * to be provided.
1076 */
1077 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1078 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1079 goto error;
1080 }
1081
1082 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1083 channel_name);
1084 if (uchan == NULL) {
1085 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1086 goto error;
1087 }
1088
1089 ret = event_ust_disable_all_tracepoints(usess, uchan);
1090 if (ret != 0) {
1091 goto error;
1092 }
1093
1094 DBG3("Disable all UST events in channel %s completed", channel_name);
1095
1096 break;
1097 }
1098 #if 0
1099 case LTTNG_DOMAIN_UST_EXEC_NAME:
1100 case LTTNG_DOMAIN_UST_PID:
1101 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1102 #endif
1103 default:
1104 ret = LTTNG_ERR_UND;
1105 goto error;
1106 }
1107
1108 ret = LTTNG_OK;
1109
1110 error:
1111 rcu_read_unlock();
1112 return ret;
1113 }
1114
1115 /*
1116 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1117 */
1118 int cmd_add_context(struct ltt_session *session, int domain,
1119 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1120 {
1121 int ret, chan_kern_created = 0, chan_ust_created = 0;
1122
1123 switch (domain) {
1124 case LTTNG_DOMAIN_KERNEL:
1125 assert(session->kernel_session);
1126
1127 if (session->kernel_session->channel_count == 0) {
1128 /* Create default channel */
1129 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1130 if (ret != LTTNG_OK) {
1131 goto error;
1132 }
1133 chan_kern_created = 1;
1134 }
1135 /* Add kernel context to kernel tracer */
1136 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1137 if (ret != LTTNG_OK) {
1138 goto error;
1139 }
1140 break;
1141 case LTTNG_DOMAIN_UST:
1142 {
1143 struct ltt_ust_session *usess = session->ust_session;
1144 unsigned int chan_count;
1145
1146 assert(usess);
1147
1148 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1149 if (chan_count == 0) {
1150 struct lttng_channel *attr;
1151 /* Create default channel */
1152 attr = channel_new_default_attr(domain, usess->buffer_type);
1153 if (attr == NULL) {
1154 ret = LTTNG_ERR_FATAL;
1155 goto error;
1156 }
1157
1158 ret = channel_ust_create(usess, attr, usess->buffer_type);
1159 if (ret != LTTNG_OK) {
1160 free(attr);
1161 goto error;
1162 }
1163 free(attr);
1164 chan_ust_created = 1;
1165 }
1166
1167 ret = context_ust_add(usess, domain, ctx, channel_name);
1168 if (ret != LTTNG_OK) {
1169 goto error;
1170 }
1171 break;
1172 }
1173 #if 0
1174 case LTTNG_DOMAIN_UST_EXEC_NAME:
1175 case LTTNG_DOMAIN_UST_PID:
1176 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1177 #endif
1178 default:
1179 ret = LTTNG_ERR_UND;
1180 goto error;
1181 }
1182
1183 return LTTNG_OK;
1184
1185 error:
1186 if (chan_kern_created) {
1187 struct ltt_kernel_channel *kchan =
1188 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1189 session->kernel_session);
1190 /* Created previously, this should NOT fail. */
1191 assert(kchan);
1192 kernel_destroy_channel(kchan);
1193 }
1194
1195 if (chan_ust_created) {
1196 struct ltt_ust_channel *uchan =
1197 trace_ust_find_channel_by_name(
1198 session->ust_session->domain_global.channels,
1199 DEFAULT_CHANNEL_NAME);
1200 /* Created previously, this should NOT fail. */
1201 assert(uchan);
1202 /* Remove from the channel list of the session. */
1203 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1204 uchan);
1205 trace_ust_destroy_channel(uchan);
1206 }
1207 return ret;
1208 }
1209
1210 /*
1211 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1212 */
1213 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1214 char *channel_name, struct lttng_event *event,
1215 struct lttng_filter_bytecode *filter, int wpipe)
1216 {
1217 int ret, channel_created = 0;
1218 struct lttng_channel *attr;
1219
1220 assert(session);
1221 assert(event);
1222 assert(channel_name);
1223
1224 rcu_read_lock();
1225
1226 switch (domain->type) {
1227 case LTTNG_DOMAIN_KERNEL:
1228 {
1229 struct ltt_kernel_channel *kchan;
1230
1231 /*
1232 * If a non-default channel has been created in the
1233 * session, explicitely require that -c chan_name needs
1234 * to be provided.
1235 */
1236 if (session->kernel_session->has_non_default_channel
1237 && channel_name[0] == '\0') {
1238 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1239 goto error;
1240 }
1241
1242 kchan = trace_kernel_get_channel_by_name(channel_name,
1243 session->kernel_session);
1244 if (kchan == NULL) {
1245 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1246 LTTNG_BUFFER_GLOBAL);
1247 if (attr == NULL) {
1248 ret = LTTNG_ERR_FATAL;
1249 goto error;
1250 }
1251 strncpy(attr->name, channel_name, sizeof(attr->name));
1252
1253 ret = cmd_enable_channel(session, domain, attr, wpipe);
1254 if (ret != LTTNG_OK) {
1255 free(attr);
1256 goto error;
1257 }
1258 free(attr);
1259
1260 channel_created = 1;
1261 }
1262
1263 /* Get the newly created kernel channel pointer */
1264 kchan = trace_kernel_get_channel_by_name(channel_name,
1265 session->kernel_session);
1266 if (kchan == NULL) {
1267 /* This sould not happen... */
1268 ret = LTTNG_ERR_FATAL;
1269 goto error;
1270 }
1271
1272 ret = event_kernel_enable_tracepoint(kchan, event);
1273 if (ret != LTTNG_OK) {
1274 if (channel_created) {
1275 /* Let's not leak a useless channel. */
1276 kernel_destroy_channel(kchan);
1277 }
1278 goto error;
1279 }
1280
1281 kernel_wait_quiescent(kernel_tracer_fd);
1282 break;
1283 }
1284 case LTTNG_DOMAIN_UST:
1285 {
1286 struct ltt_ust_channel *uchan;
1287 struct ltt_ust_session *usess = session->ust_session;
1288
1289 assert(usess);
1290
1291 /*
1292 * If a non-default channel has been created in the
1293 * session, explicitely require that -c chan_name needs
1294 * to be provided.
1295 */
1296 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1297 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1298 goto error;
1299 }
1300
1301 /* Get channel from global UST domain */
1302 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1303 channel_name);
1304 if (uchan == NULL) {
1305 /* Create default channel */
1306 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1307 usess->buffer_type);
1308 if (attr == NULL) {
1309 ret = LTTNG_ERR_FATAL;
1310 goto error;
1311 }
1312 strncpy(attr->name, channel_name, sizeof(attr->name));
1313
1314 ret = cmd_enable_channel(session, domain, attr, wpipe);
1315 if (ret != LTTNG_OK) {
1316 free(attr);
1317 goto error;
1318 }
1319 free(attr);
1320
1321 /* Get the newly created channel reference back */
1322 uchan = trace_ust_find_channel_by_name(
1323 usess->domain_global.channels, channel_name);
1324 assert(uchan);
1325 }
1326
1327 /* At this point, the session and channel exist on the tracer */
1328 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1329 if (ret != LTTNG_OK) {
1330 goto error;
1331 }
1332 break;
1333 }
1334 #if 0
1335 case LTTNG_DOMAIN_UST_EXEC_NAME:
1336 case LTTNG_DOMAIN_UST_PID:
1337 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1338 #endif
1339 default:
1340 ret = LTTNG_ERR_UND;
1341 goto error;
1342 }
1343
1344 ret = LTTNG_OK;
1345
1346 error:
1347 rcu_read_unlock();
1348 return ret;
1349 }
1350
1351 /*
1352 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1353 */
1354 int cmd_enable_event_all(struct ltt_session *session,
1355 struct lttng_domain *domain, char *channel_name, int event_type,
1356 struct lttng_filter_bytecode *filter, int wpipe)
1357 {
1358 int ret;
1359 struct lttng_channel *attr;
1360
1361 assert(session);
1362 assert(channel_name);
1363
1364 rcu_read_lock();
1365
1366 switch (domain->type) {
1367 case LTTNG_DOMAIN_KERNEL:
1368 {
1369 struct ltt_kernel_channel *kchan;
1370
1371 assert(session->kernel_session);
1372
1373 /*
1374 * If a non-default channel has been created in the
1375 * session, explicitely require that -c chan_name needs
1376 * to be provided.
1377 */
1378 if (session->kernel_session->has_non_default_channel
1379 && channel_name[0] == '\0') {
1380 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1381 goto error;
1382 }
1383
1384 kchan = trace_kernel_get_channel_by_name(channel_name,
1385 session->kernel_session);
1386 if (kchan == NULL) {
1387 /* Create default channel */
1388 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1389 LTTNG_BUFFER_GLOBAL);
1390 if (attr == NULL) {
1391 ret = LTTNG_ERR_FATAL;
1392 goto error;
1393 }
1394 strncpy(attr->name, channel_name, sizeof(attr->name));
1395
1396 ret = cmd_enable_channel(session, domain, attr, wpipe);
1397 if (ret != LTTNG_OK) {
1398 free(attr);
1399 goto error;
1400 }
1401 free(attr);
1402
1403 /* Get the newly created kernel channel pointer */
1404 kchan = trace_kernel_get_channel_by_name(channel_name,
1405 session->kernel_session);
1406 assert(kchan);
1407 }
1408
1409 switch (event_type) {
1410 case LTTNG_EVENT_SYSCALL:
1411 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1412 break;
1413 case LTTNG_EVENT_TRACEPOINT:
1414 /*
1415 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1416 * events already registered to the channel.
1417 */
1418 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1419 break;
1420 case LTTNG_EVENT_ALL:
1421 /* Enable syscalls and tracepoints */
1422 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1423 break;
1424 default:
1425 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1426 goto error;
1427 }
1428
1429 /* Manage return value */
1430 if (ret != LTTNG_OK) {
1431 /*
1432 * On error, cmd_enable_channel call will take care of destroying
1433 * the created channel if it was needed.
1434 */
1435 goto error;
1436 }
1437
1438 kernel_wait_quiescent(kernel_tracer_fd);
1439 break;
1440 }
1441 case LTTNG_DOMAIN_UST:
1442 {
1443 struct ltt_ust_channel *uchan;
1444 struct ltt_ust_session *usess = session->ust_session;
1445
1446 assert(usess);
1447
1448 /*
1449 * If a non-default channel has been created in the
1450 * session, explicitely require that -c chan_name needs
1451 * to be provided.
1452 */
1453 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1454 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1455 goto error;
1456 }
1457
1458 /* Get channel from global UST domain */
1459 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1460 channel_name);
1461 if (uchan == NULL) {
1462 /* Create default channel */
1463 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1464 usess->buffer_type);
1465 if (attr == NULL) {
1466 ret = LTTNG_ERR_FATAL;
1467 goto error;
1468 }
1469 strncpy(attr->name, channel_name, sizeof(attr->name));
1470
1471 ret = cmd_enable_channel(session, domain, attr, wpipe);
1472 if (ret != LTTNG_OK) {
1473 free(attr);
1474 goto error;
1475 }
1476 free(attr);
1477
1478 /* Get the newly created channel reference back */
1479 uchan = trace_ust_find_channel_by_name(
1480 usess->domain_global.channels, channel_name);
1481 assert(uchan);
1482 }
1483
1484 /* At this point, the session and channel exist on the tracer */
1485
1486 switch (event_type) {
1487 case LTTNG_EVENT_ALL:
1488 case LTTNG_EVENT_TRACEPOINT:
1489 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1490 if (ret != LTTNG_OK) {
1491 goto error;
1492 }
1493 break;
1494 default:
1495 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1496 goto error;
1497 }
1498
1499 /* Manage return value */
1500 if (ret != LTTNG_OK) {
1501 goto error;
1502 }
1503
1504 break;
1505 }
1506 #if 0
1507 case LTTNG_DOMAIN_UST_EXEC_NAME:
1508 case LTTNG_DOMAIN_UST_PID:
1509 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1510 #endif
1511 default:
1512 ret = LTTNG_ERR_UND;
1513 goto error;
1514 }
1515
1516 ret = LTTNG_OK;
1517
1518 error:
1519 rcu_read_unlock();
1520 return ret;
1521 }
1522
1523
1524 /*
1525 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1526 */
1527 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1528 {
1529 int ret;
1530 ssize_t nb_events = 0;
1531
1532 switch (domain) {
1533 case LTTNG_DOMAIN_KERNEL:
1534 nb_events = kernel_list_events(kernel_tracer_fd, events);
1535 if (nb_events < 0) {
1536 ret = LTTNG_ERR_KERN_LIST_FAIL;
1537 goto error;
1538 }
1539 break;
1540 case LTTNG_DOMAIN_UST:
1541 nb_events = ust_app_list_events(events);
1542 if (nb_events < 0) {
1543 ret = LTTNG_ERR_UST_LIST_FAIL;
1544 goto error;
1545 }
1546 break;
1547 default:
1548 ret = LTTNG_ERR_UND;
1549 goto error;
1550 }
1551
1552 return nb_events;
1553
1554 error:
1555 /* Return negative value to differentiate return code */
1556 return -ret;
1557 }
1558
1559 /*
1560 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1561 */
1562 ssize_t cmd_list_tracepoint_fields(int domain,
1563 struct lttng_event_field **fields)
1564 {
1565 int ret;
1566 ssize_t nb_fields = 0;
1567
1568 switch (domain) {
1569 case LTTNG_DOMAIN_UST:
1570 nb_fields = ust_app_list_event_fields(fields);
1571 if (nb_fields < 0) {
1572 ret = LTTNG_ERR_UST_LIST_FAIL;
1573 goto error;
1574 }
1575 break;
1576 case LTTNG_DOMAIN_KERNEL:
1577 default: /* fall-through */
1578 ret = LTTNG_ERR_UND;
1579 goto error;
1580 }
1581
1582 return nb_fields;
1583
1584 error:
1585 /* Return negative value to differentiate return code */
1586 return -ret;
1587 }
1588
1589 /*
1590 * Command LTTNG_START_TRACE processed by the client thread.
1591 */
1592 int cmd_start_trace(struct ltt_session *session)
1593 {
1594 int ret;
1595 struct ltt_kernel_session *ksession;
1596 struct ltt_ust_session *usess;
1597
1598 assert(session);
1599
1600 /* Ease our life a bit ;) */
1601 ksession = session->kernel_session;
1602 usess = session->ust_session;
1603
1604 if (session->enabled) {
1605 /* Already started. */
1606 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1607 goto error;
1608 }
1609
1610 session->enabled = 1;
1611
1612 /* Kernel tracing */
1613 if (ksession != NULL) {
1614 ret = start_kernel_session(ksession, kernel_tracer_fd);
1615 if (ret != LTTNG_OK) {
1616 goto error;
1617 }
1618 }
1619
1620 /* Flag session that trace should start automatically */
1621 if (usess) {
1622 usess->start_trace = 1;
1623
1624 ret = ust_app_start_trace_all(usess);
1625 if (ret < 0) {
1626 ret = LTTNG_ERR_UST_START_FAIL;
1627 goto error;
1628 }
1629 }
1630
1631 session->started = 1;
1632
1633 ret = LTTNG_OK;
1634
1635 error:
1636 return ret;
1637 }
1638
1639 /*
1640 * Command LTTNG_STOP_TRACE processed by the client thread.
1641 */
1642 int cmd_stop_trace(struct ltt_session *session)
1643 {
1644 int ret;
1645 struct ltt_kernel_channel *kchan;
1646 struct ltt_kernel_session *ksession;
1647 struct ltt_ust_session *usess;
1648
1649 assert(session);
1650
1651 /* Short cut */
1652 ksession = session->kernel_session;
1653 usess = session->ust_session;
1654
1655 if (!session->enabled) {
1656 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1657 goto error;
1658 }
1659
1660 session->enabled = 0;
1661
1662 /* Kernel tracer */
1663 if (ksession && ksession->started) {
1664 DBG("Stop kernel tracing");
1665
1666 /* Flush metadata if exist */
1667 if (ksession->metadata_stream_fd >= 0) {
1668 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1669 if (ret < 0) {
1670 ERR("Kernel metadata flush failed");
1671 }
1672 }
1673
1674 /* Flush all buffers before stopping */
1675 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1676 ret = kernel_flush_buffer(kchan);
1677 if (ret < 0) {
1678 ERR("Kernel flush buffer error");
1679 }
1680 }
1681
1682 ret = kernel_stop_session(ksession);
1683 if (ret < 0) {
1684 ret = LTTNG_ERR_KERN_STOP_FAIL;
1685 goto error;
1686 }
1687
1688 kernel_wait_quiescent(kernel_tracer_fd);
1689
1690 ksession->started = 0;
1691 }
1692
1693 if (usess && usess->start_trace) {
1694 usess->start_trace = 0;
1695
1696 ret = ust_app_stop_trace_all(usess);
1697 if (ret < 0) {
1698 ret = LTTNG_ERR_UST_STOP_FAIL;
1699 goto error;
1700 }
1701 }
1702
1703 ret = LTTNG_OK;
1704
1705 error:
1706 return ret;
1707 }
1708
1709 /*
1710 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1711 */
1712 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1713 size_t nb_uri, struct lttng_uri *uris)
1714 {
1715 int ret, i;
1716 struct ltt_kernel_session *ksess = session->kernel_session;
1717 struct ltt_ust_session *usess = session->ust_session;
1718 struct consumer_output *consumer = NULL;
1719
1720 assert(session);
1721 assert(uris);
1722 assert(nb_uri > 0);
1723
1724 /* Can't enable consumer after session started. */
1725 if (session->enabled) {
1726 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1727 goto error;
1728 }
1729
1730 /*
1731 * This case switch makes sure the domain session has a temporary consumer
1732 * so the URL can be set.
1733 */
1734 switch (domain) {
1735 case 0:
1736 /* Code flow error. A session MUST always have a consumer object */
1737 assert(session->consumer);
1738 /*
1739 * The URL will be added to the tracing session consumer instead of a
1740 * specific domain consumer.
1741 */
1742 consumer = session->consumer;
1743 break;
1744 case LTTNG_DOMAIN_KERNEL:
1745 /* Code flow error if we don't have a kernel session here. */
1746 assert(ksess);
1747 assert(ksess->consumer);
1748 consumer = ksess->consumer;
1749 break;
1750 case LTTNG_DOMAIN_UST:
1751 /* Code flow error if we don't have a kernel session here. */
1752 assert(usess);
1753 assert(usess->consumer);
1754 consumer = usess->consumer;
1755 break;
1756 }
1757
1758 for (i = 0; i < nb_uri; i++) {
1759 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1760 if (ret != LTTNG_OK) {
1761 goto error;
1762 }
1763 }
1764
1765 /* All good! */
1766 ret = LTTNG_OK;
1767
1768 error:
1769 return ret;
1770 }
1771
1772 /*
1773 * Command LTTNG_CREATE_SESSION processed by the client thread.
1774 */
1775 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1776 size_t nb_uri, lttng_sock_cred *creds)
1777 {
1778 int ret;
1779 struct ltt_session *session;
1780
1781 assert(name);
1782 assert(creds);
1783
1784 /*
1785 * Verify if the session already exist
1786 *
1787 * XXX: There is no need for the session lock list here since the caller
1788 * (process_client_msg) is holding it. We might want to change that so a
1789 * single command does not lock the entire session list.
1790 */
1791 session = session_find_by_name(name);
1792 if (session != NULL) {
1793 ret = LTTNG_ERR_EXIST_SESS;
1794 goto find_error;
1795 }
1796
1797 /* Create tracing session in the registry */
1798 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1799 LTTNG_SOCK_GET_GID_CRED(creds));
1800 if (ret != LTTNG_OK) {
1801 goto session_error;
1802 }
1803
1804 /*
1805 * Get the newly created session pointer back
1806 *
1807 * XXX: There is no need for the session lock list here since the caller
1808 * (process_client_msg) is holding it. We might want to change that so a
1809 * single command does not lock the entire session list.
1810 */
1811 session = session_find_by_name(name);
1812 assert(session);
1813
1814 /* Create default consumer output for the session not yet created. */
1815 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1816 if (session->consumer == NULL) {
1817 ret = LTTNG_ERR_FATAL;
1818 goto consumer_error;
1819 }
1820
1821 if (uris) {
1822 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1823 if (ret != LTTNG_OK) {
1824 goto consumer_error;
1825 }
1826 session->output_traces = 1;
1827 } else {
1828 session->output_traces = 0;
1829 DBG2("Session %s created with no output", session->name);
1830 }
1831
1832 session->consumer->enabled = 1;
1833
1834 return LTTNG_OK;
1835
1836 consumer_error:
1837 session_destroy(session);
1838 session_error:
1839 find_error:
1840 return ret;
1841 }
1842
1843 /*
1844 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1845 */
1846 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
1847 size_t nb_uri, lttng_sock_cred *creds)
1848 {
1849 int ret;
1850 struct ltt_session *session;
1851 struct snapshot_output *new_output = NULL;
1852
1853 assert(name);
1854 assert(creds);
1855
1856 /*
1857 * Create session in no output mode with URIs set to NULL. The uris we've
1858 * received are for a default snapshot output if one.
1859 */
1860 ret = cmd_create_session_uri(name, NULL, 0, creds);
1861 if (ret != LTTNG_OK) {
1862 goto error;
1863 }
1864
1865 /* Get the newly created session pointer back. This should NEVER fail. */
1866 session = session_find_by_name(name);
1867 assert(session);
1868
1869 /* Flag session for snapshot mode. */
1870 session->snapshot_mode = 1;
1871
1872 /* Skip snapshot output creation if no URI is given. */
1873 if (nb_uri == 0) {
1874 goto end;
1875 }
1876
1877 new_output = snapshot_output_alloc();
1878 if (!new_output) {
1879 ret = LTTNG_ERR_NOMEM;
1880 goto error_snapshot_alloc;
1881 }
1882
1883 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
1884 uris, nb_uri, session->consumer, new_output, &session->snapshot);
1885 if (ret < 0) {
1886 if (ret == -ENOMEM) {
1887 ret = LTTNG_ERR_NOMEM;
1888 } else {
1889 ret = LTTNG_ERR_INVALID;
1890 }
1891 goto error_snapshot;
1892 }
1893
1894 rcu_read_lock();
1895 snapshot_add_output(&session->snapshot, new_output);
1896 rcu_read_unlock();
1897
1898 end:
1899 return LTTNG_OK;
1900
1901 error_snapshot:
1902 snapshot_output_destroy(new_output);
1903 error_snapshot_alloc:
1904 session_destroy(session);
1905 error:
1906 return ret;
1907 }
1908
1909 /*
1910 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1911 */
1912 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1913 {
1914 int ret;
1915 struct ltt_ust_session *usess;
1916 struct ltt_kernel_session *ksess;
1917
1918 /* Safety net */
1919 assert(session);
1920
1921 usess = session->ust_session;
1922 ksess = session->kernel_session;
1923
1924 /* Clean kernel session teardown */
1925 kernel_destroy_session(ksess);
1926
1927 /* UST session teardown */
1928 if (usess) {
1929 /* Close any relayd session */
1930 consumer_output_send_destroy_relayd(usess->consumer);
1931
1932 /* Destroy every UST application related to this session. */
1933 ret = ust_app_destroy_trace_all(usess);
1934 if (ret) {
1935 ERR("Error in ust_app_destroy_trace_all");
1936 }
1937
1938 /* Clean up the rest. */
1939 trace_ust_destroy_session(usess);
1940 }
1941
1942 /*
1943 * Must notify the kernel thread here to update it's poll set in order to
1944 * remove the channel(s)' fd just destroyed.
1945 */
1946 ret = notify_thread_pipe(wpipe);
1947 if (ret < 0) {
1948 PERROR("write kernel poll pipe");
1949 }
1950
1951 ret = session_destroy(session);
1952
1953 return ret;
1954 }
1955
1956 /*
1957 * Command LTTNG_CALIBRATE processed by the client thread.
1958 */
1959 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1960 {
1961 int ret;
1962
1963 switch (domain) {
1964 case LTTNG_DOMAIN_KERNEL:
1965 {
1966 struct lttng_kernel_calibrate kcalibrate;
1967
1968 kcalibrate.type = calibrate->type;
1969 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1970 if (ret < 0) {
1971 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1972 goto error;
1973 }
1974 break;
1975 }
1976 case LTTNG_DOMAIN_UST:
1977 {
1978 struct lttng_ust_calibrate ucalibrate;
1979
1980 ucalibrate.type = calibrate->type;
1981 ret = ust_app_calibrate_glb(&ucalibrate);
1982 if (ret < 0) {
1983 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1984 goto error;
1985 }
1986 break;
1987 }
1988 default:
1989 ret = LTTNG_ERR_UND;
1990 goto error;
1991 }
1992
1993 ret = LTTNG_OK;
1994
1995 error:
1996 return ret;
1997 }
1998
1999 /*
2000 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2001 */
2002 int cmd_register_consumer(struct ltt_session *session, int domain,
2003 const char *sock_path, struct consumer_data *cdata)
2004 {
2005 int ret, sock;
2006 struct consumer_socket *socket = NULL;
2007
2008 assert(session);
2009 assert(cdata);
2010 assert(sock_path);
2011
2012 switch (domain) {
2013 case LTTNG_DOMAIN_KERNEL:
2014 {
2015 struct ltt_kernel_session *ksess = session->kernel_session;
2016
2017 assert(ksess);
2018
2019 /* Can't register a consumer if there is already one */
2020 if (ksess->consumer_fds_sent != 0) {
2021 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2022 goto error;
2023 }
2024
2025 sock = lttcomm_connect_unix_sock(sock_path);
2026 if (sock < 0) {
2027 ret = LTTNG_ERR_CONNECT_FAIL;
2028 goto error;
2029 }
2030
2031 socket = consumer_allocate_socket(sock);
2032 if (socket == NULL) {
2033 ret = close(sock);
2034 if (ret < 0) {
2035 PERROR("close register consumer");
2036 }
2037 ret = LTTNG_ERR_FATAL;
2038 goto error;
2039 }
2040
2041 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2042 if (socket->lock == NULL) {
2043 PERROR("zmalloc pthread mutex");
2044 ret = LTTNG_ERR_FATAL;
2045 goto error;
2046 }
2047 pthread_mutex_init(socket->lock, NULL);
2048 socket->registered = 1;
2049
2050 rcu_read_lock();
2051 consumer_add_socket(socket, ksess->consumer);
2052 rcu_read_unlock();
2053
2054 pthread_mutex_lock(&cdata->pid_mutex);
2055 cdata->pid = -1;
2056 pthread_mutex_unlock(&cdata->pid_mutex);
2057
2058 break;
2059 }
2060 default:
2061 /* TODO: Userspace tracing */
2062 ret = LTTNG_ERR_UND;
2063 goto error;
2064 }
2065
2066 return LTTNG_OK;
2067
2068 error:
2069 if (socket) {
2070 consumer_destroy_socket(socket);
2071 }
2072 return ret;
2073 }
2074
2075 /*
2076 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2077 */
2078 ssize_t cmd_list_domains(struct ltt_session *session,
2079 struct lttng_domain **domains)
2080 {
2081 int ret, index = 0;
2082 ssize_t nb_dom = 0;
2083
2084 if (session->kernel_session != NULL) {
2085 DBG3("Listing domains found kernel domain");
2086 nb_dom++;
2087 }
2088
2089 if (session->ust_session != NULL) {
2090 DBG3("Listing domains found UST global domain");
2091 nb_dom++;
2092 }
2093
2094 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2095 if (*domains == NULL) {
2096 ret = LTTNG_ERR_FATAL;
2097 goto error;
2098 }
2099
2100 if (session->kernel_session != NULL) {
2101 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2102 index++;
2103 }
2104
2105 if (session->ust_session != NULL) {
2106 (*domains)[index].type = LTTNG_DOMAIN_UST;
2107 (*domains)[index].buf_type = session->ust_session->buffer_type;
2108 index++;
2109 }
2110
2111 return nb_dom;
2112
2113 error:
2114 /* Return negative value to differentiate return code */
2115 return -ret;
2116 }
2117
2118
2119 /*
2120 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2121 */
2122 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2123 struct lttng_channel **channels)
2124 {
2125 int ret;
2126 ssize_t nb_chan = 0;
2127
2128 switch (domain) {
2129 case LTTNG_DOMAIN_KERNEL:
2130 if (session->kernel_session != NULL) {
2131 nb_chan = session->kernel_session->channel_count;
2132 }
2133 DBG3("Number of kernel channels %zd", nb_chan);
2134 if (nb_chan <= 0) {
2135 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2136 }
2137 break;
2138 case LTTNG_DOMAIN_UST:
2139 if (session->ust_session != NULL) {
2140 nb_chan = lttng_ht_get_count(
2141 session->ust_session->domain_global.channels);
2142 }
2143 DBG3("Number of UST global channels %zd", nb_chan);
2144 if (nb_chan <= 0) {
2145 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2146 }
2147 break;
2148 default:
2149 *channels = NULL;
2150 ret = LTTNG_ERR_UND;
2151 goto error;
2152 }
2153
2154 if (nb_chan > 0) {
2155 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2156 if (*channels == NULL) {
2157 ret = LTTNG_ERR_FATAL;
2158 goto error;
2159 }
2160
2161 list_lttng_channels(domain, session, *channels);
2162 } else {
2163 *channels = NULL;
2164 /* Ret value was set in the domain switch case */
2165 goto error;
2166 }
2167
2168 return nb_chan;
2169
2170 error:
2171 /* Return negative value to differentiate return code */
2172 return -ret;
2173 }
2174
2175 /*
2176 * Command LTTNG_LIST_EVENTS processed by the client thread.
2177 */
2178 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2179 char *channel_name, struct lttng_event **events)
2180 {
2181 int ret = 0;
2182 ssize_t nb_event = 0;
2183
2184 switch (domain) {
2185 case LTTNG_DOMAIN_KERNEL:
2186 if (session->kernel_session != NULL) {
2187 nb_event = list_lttng_kernel_events(channel_name,
2188 session->kernel_session, events);
2189 }
2190 break;
2191 case LTTNG_DOMAIN_UST:
2192 {
2193 if (session->ust_session != NULL) {
2194 nb_event = list_lttng_ust_global_events(channel_name,
2195 &session->ust_session->domain_global, events);
2196 }
2197 break;
2198 }
2199 default:
2200 ret = LTTNG_ERR_UND;
2201 goto error;
2202 }
2203
2204 return nb_event;
2205
2206 error:
2207 /* Return negative value to differentiate return code */
2208 return -ret;
2209 }
2210
2211 /*
2212 * Using the session list, filled a lttng_session array to send back to the
2213 * client for session listing.
2214 *
2215 * The session list lock MUST be acquired before calling this function. Use
2216 * session_lock_list() and session_unlock_list().
2217 */
2218 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2219 gid_t gid)
2220 {
2221 int ret;
2222 unsigned int i = 0;
2223 struct ltt_session *session;
2224 struct ltt_session_list *list = session_get_list();
2225
2226 DBG("Getting all available session for UID %d GID %d",
2227 uid, gid);
2228 /*
2229 * Iterate over session list and append data after the control struct in
2230 * the buffer.
2231 */
2232 cds_list_for_each_entry(session, &list->head, list) {
2233 /*
2234 * Only list the sessions the user can control.
2235 */
2236 if (!session_access_ok(session, uid, gid)) {
2237 continue;
2238 }
2239
2240 struct ltt_kernel_session *ksess = session->kernel_session;
2241 struct ltt_ust_session *usess = session->ust_session;
2242
2243 if (session->consumer->type == CONSUMER_DST_NET ||
2244 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2245 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2246 ret = build_network_session_path(sessions[i].path,
2247 sizeof(sessions[i].path), session);
2248 } else {
2249 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2250 session->consumer->dst.trace_path);
2251 }
2252 if (ret < 0) {
2253 PERROR("snprintf session path");
2254 continue;
2255 }
2256
2257 strncpy(sessions[i].name, session->name, NAME_MAX);
2258 sessions[i].name[NAME_MAX - 1] = '\0';
2259 sessions[i].enabled = session->enabled;
2260 sessions[i].snapshot_mode = session->snapshot_mode;
2261 i++;
2262 }
2263 }
2264
2265 /*
2266 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2267 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2268 */
2269 int cmd_data_pending(struct ltt_session *session)
2270 {
2271 int ret;
2272 struct ltt_kernel_session *ksess = session->kernel_session;
2273 struct ltt_ust_session *usess = session->ust_session;
2274
2275 assert(session);
2276
2277 /* Session MUST be stopped to ask for data availability. */
2278 if (session->enabled) {
2279 ret = LTTNG_ERR_SESSION_STARTED;
2280 goto error;
2281 }
2282
2283 if (ksess && ksess->consumer) {
2284 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2285 if (ret == 1) {
2286 /* Data is still being extracted for the kernel. */
2287 goto error;
2288 }
2289 }
2290
2291 if (usess && usess->consumer) {
2292 ret = consumer_is_data_pending(usess->id, usess->consumer);
2293 if (ret == 1) {
2294 /* Data is still being extracted for the kernel. */
2295 goto error;
2296 }
2297 }
2298
2299 /* Data is ready to be read by a viewer */
2300 ret = 0;
2301
2302 error:
2303 return ret;
2304 }
2305
2306 /*
2307 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2308 *
2309 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2310 */
2311 int cmd_snapshot_add_output(struct ltt_session *session,
2312 struct lttng_snapshot_output *output, uint32_t *id)
2313 {
2314 int ret;
2315 struct snapshot_output *new_output;
2316
2317 assert(session);
2318 assert(output);
2319
2320 DBG("Cmd snapshot add output for session %s", session->name);
2321
2322 /*
2323 * Permission denied to create an output if the session is not
2324 * set in no output mode.
2325 */
2326 if (session->output_traces) {
2327 ret = LTTNG_ERR_EPERM;
2328 goto error;
2329 }
2330
2331 /* Only one output is allowed until we have the "tee" feature. */
2332 if (session->snapshot.nb_output == 1) {
2333 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2334 goto error;
2335 }
2336
2337 new_output = snapshot_output_alloc();
2338 if (!new_output) {
2339 ret = LTTNG_ERR_NOMEM;
2340 goto error;
2341 }
2342
2343 ret = snapshot_output_init(output->max_size, output->name,
2344 output->ctrl_url, output->data_url, session->consumer, new_output,
2345 &session->snapshot);
2346 if (ret < 0) {
2347 if (ret == -ENOMEM) {
2348 ret = LTTNG_ERR_NOMEM;
2349 } else {
2350 ret = LTTNG_ERR_INVALID;
2351 }
2352 goto free_error;
2353 }
2354
2355 rcu_read_lock();
2356 snapshot_add_output(&session->snapshot, new_output);
2357 if (id) {
2358 *id = new_output->id;
2359 }
2360 rcu_read_unlock();
2361
2362 return LTTNG_OK;
2363
2364 free_error:
2365 snapshot_output_destroy(new_output);
2366 error:
2367 return ret;
2368 }
2369
2370 /*
2371 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2372 *
2373 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2374 */
2375 int cmd_snapshot_del_output(struct ltt_session *session,
2376 struct lttng_snapshot_output *output)
2377 {
2378 int ret;
2379 struct snapshot_output *sout = NULL;
2380
2381 assert(session);
2382 assert(output);
2383
2384 rcu_read_lock();
2385
2386 /*
2387 * Permission denied to create an output if the session is not
2388 * set in no output mode.
2389 */
2390 if (session->output_traces) {
2391 ret = LTTNG_ERR_EPERM;
2392 goto error;
2393 }
2394
2395 if (output->id) {
2396 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2397 session->name);
2398 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2399 } else if (*output->name != '\0') {
2400 DBG("Cmd snapshot del output name %s for session %s", output->name,
2401 session->name);
2402 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2403 }
2404 if (!sout) {
2405 ret = LTTNG_ERR_INVALID;
2406 goto error;
2407 }
2408
2409 snapshot_delete_output(&session->snapshot, sout);
2410 snapshot_output_destroy(sout);
2411 ret = LTTNG_OK;
2412
2413 error:
2414 rcu_read_unlock();
2415 return ret;
2416 }
2417
2418 /*
2419 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2420 *
2421 * If no output is available, outputs is untouched and 0 is returned.
2422 *
2423 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2424 */
2425 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2426 struct lttng_snapshot_output **outputs)
2427 {
2428 int ret, idx = 0;
2429 struct lttng_snapshot_output *list;
2430 struct lttng_ht_iter iter;
2431 struct snapshot_output *output;
2432
2433 assert(session);
2434 assert(outputs);
2435
2436 DBG("Cmd snapshot list outputs for session %s", session->name);
2437
2438 /*
2439 * Permission denied to create an output if the session is not
2440 * set in no output mode.
2441 */
2442 if (session->output_traces) {
2443 ret = LTTNG_ERR_EPERM;
2444 goto error;
2445 }
2446
2447 if (session->snapshot.nb_output == 0) {
2448 ret = 0;
2449 goto error;
2450 }
2451
2452 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2453 if (!list) {
2454 ret = LTTNG_ERR_NOMEM;
2455 goto error;
2456 }
2457
2458 /* Copy list from session to the new list object. */
2459 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2460 output, node.node) {
2461 assert(output->consumer);
2462 list[idx].id = output->id;
2463 list[idx].max_size = output->max_size;
2464 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2465 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2466 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2467 sizeof(list[idx].ctrl_url));
2468 } else {
2469 /* Control URI. */
2470 ret = uri_to_str_url(&output->consumer->dst.net.control,
2471 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2472 if (ret < 0) {
2473 ret = LTTNG_ERR_NOMEM;
2474 goto free_error;
2475 }
2476
2477 /* Data URI. */
2478 ret = uri_to_str_url(&output->consumer->dst.net.data,
2479 list[idx].data_url, sizeof(list[idx].data_url));
2480 if (ret < 0) {
2481 ret = LTTNG_ERR_NOMEM;
2482 goto free_error;
2483 }
2484 }
2485 idx++;
2486 }
2487
2488 *outputs = list;
2489 return session->snapshot.nb_output;
2490
2491 free_error:
2492 free(list);
2493 error:
2494 return -ret;
2495 }
2496
2497 /*
2498 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2499 * snapshot output is *not* set with a remote destination.
2500 *
2501 * Return 0 on success or a LTTNG_ERR code.
2502 */
2503 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2504 struct snapshot_output *snap_output, struct ltt_session *session)
2505 {
2506 int ret = LTTNG_OK;
2507 struct lttng_ht_iter iter;
2508 struct consumer_socket *socket;
2509
2510 assert(consumer);
2511 assert(snap_output);
2512 assert(session);
2513
2514 DBG2("Set relayd object from snapshot output");
2515
2516 /* Ignore if snapshot consumer output is not network. */
2517 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2518 goto error;
2519 }
2520
2521 /*
2522 * For each consumer socket, create and send the relayd object of the
2523 * snapshot output.
2524 */
2525 rcu_read_lock();
2526 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2527 socket, node.node) {
2528 ret = send_consumer_relayd_sockets(0, session->id,
2529 snap_output->consumer, socket);
2530 if (ret != LTTNG_OK) {
2531 rcu_read_unlock();
2532 goto error;
2533 }
2534 }
2535 rcu_read_unlock();
2536
2537 error:
2538 return ret;
2539 }
2540
2541 /*
2542 * Record a kernel snapshot.
2543 *
2544 * Return 0 on success or a LTTNG_ERR code.
2545 */
2546 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2547 struct snapshot_output *output, struct ltt_session *session,
2548 int wait, int nb_streams)
2549 {
2550 int ret;
2551
2552 assert(ksess);
2553 assert(output);
2554 assert(session);
2555
2556 /* Get the datetime for the snapshot output directory. */
2557 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2558 sizeof(output->datetime));
2559 if (!ret) {
2560 ret = LTTNG_ERR_INVALID;
2561 goto error;
2562 }
2563
2564 /*
2565 * Copy kernel session sockets so we can communicate with the right
2566 * consumer for the snapshot record command.
2567 */
2568 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2569 if (ret < 0) {
2570 ret = LTTNG_ERR_NOMEM;
2571 goto error;
2572 }
2573
2574 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2575 if (ret != LTTNG_OK) {
2576 goto error_snapshot;
2577 }
2578
2579 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2580 if (ret < 0) {
2581 if (ret == -EINVAL) {
2582 ret = LTTNG_ERR_INVALID;
2583 goto error_snapshot;
2584 }
2585
2586 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2587 goto error_snapshot;
2588 }
2589
2590 ret = LTTNG_OK;
2591
2592 error_snapshot:
2593 /* Clean up copied sockets so this output can use some other later on. */
2594 consumer_destroy_output_sockets(output->consumer);
2595 error:
2596 return ret;
2597 }
2598
2599 /*
2600 * Record a UST snapshot.
2601 *
2602 * Return 0 on success or a LTTNG_ERR error code.
2603 */
2604 static int record_ust_snapshot(struct ltt_ust_session *usess,
2605 struct snapshot_output *output, struct ltt_session *session,
2606 int wait, int nb_streams)
2607 {
2608 int ret;
2609
2610 assert(usess);
2611 assert(output);
2612 assert(session);
2613
2614 /* Get the datetime for the snapshot output directory. */
2615 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2616 sizeof(output->datetime));
2617 if (!ret) {
2618 ret = LTTNG_ERR_INVALID;
2619 goto error;
2620 }
2621
2622 /*
2623 * Copy UST session sockets so we can communicate with the right
2624 * consumer for the snapshot record command.
2625 */
2626 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2627 if (ret < 0) {
2628 ret = LTTNG_ERR_NOMEM;
2629 goto error;
2630 }
2631
2632 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2633 if (ret != LTTNG_OK) {
2634 goto error_snapshot;
2635 }
2636
2637 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2638 if (ret < 0) {
2639 if (ret == -EINVAL) {
2640 ret = LTTNG_ERR_INVALID;
2641 goto error_snapshot;
2642 }
2643
2644 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2645 goto error_snapshot;
2646 }
2647
2648 ret = LTTNG_OK;
2649
2650 error_snapshot:
2651 /* Clean up copied sockets so this output can use some other later on. */
2652 consumer_destroy_output_sockets(output->consumer);
2653 error:
2654 return ret;
2655 }
2656
2657 /*
2658 * Returns the total number of streams for a session or a negative value
2659 * on error.
2660 */
2661 static unsigned int get_total_nb_stream(struct ltt_session *session)
2662 {
2663 unsigned int total_streams = 0;
2664
2665 if (session->kernel_session) {
2666 struct ltt_kernel_session *ksess = session->kernel_session;
2667
2668 total_streams += ksess->stream_count_global;
2669 }
2670
2671 if (session->ust_session) {
2672 struct ltt_ust_session *usess = session->ust_session;
2673
2674 total_streams += ust_app_get_nb_stream(usess);
2675 }
2676
2677 return total_streams;
2678 }
2679
2680 /*
2681 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2682 *
2683 * The wait parameter is ignored so this call always wait for the snapshot to
2684 * complete before returning.
2685 *
2686 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2687 */
2688 int cmd_snapshot_record(struct ltt_session *session,
2689 struct lttng_snapshot_output *output, int wait)
2690 {
2691 int ret = LTTNG_OK;
2692 unsigned int use_tmp_output = 0;
2693 struct snapshot_output tmp_output;
2694 unsigned int nb_streams, snapshot_success = 0;
2695
2696 assert(session);
2697
2698 DBG("Cmd snapshot record for session %s", session->name);
2699
2700 /*
2701 * Permission denied to create an output if the session is not
2702 * set in no output mode.
2703 */
2704 if (session->output_traces) {
2705 ret = LTTNG_ERR_EPERM;
2706 goto error;
2707 }
2708
2709 /* The session needs to be started at least once. */
2710 if (!session->started) {
2711 ret = LTTNG_ERR_START_SESSION_ONCE;
2712 goto error;
2713 }
2714
2715 /* Use temporary output for the session. */
2716 if (output && *output->ctrl_url != '\0') {
2717 ret = snapshot_output_init(output->max_size, output->name,
2718 output->ctrl_url, output->data_url, session->consumer,
2719 &tmp_output, NULL);
2720 if (ret < 0) {
2721 if (ret == -ENOMEM) {
2722 ret = LTTNG_ERR_NOMEM;
2723 } else {
2724 ret = LTTNG_ERR_INVALID;
2725 }
2726 goto error;
2727 }
2728 /* Use the global session count for the temporary snapshot. */
2729 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2730 use_tmp_output = 1;
2731 }
2732
2733 /*
2734 * Get the total number of stream of that session which is used by the
2735 * maximum size of the snapshot feature.
2736 */
2737 nb_streams = get_total_nb_stream(session);
2738
2739 if (session->kernel_session) {
2740 struct ltt_kernel_session *ksess = session->kernel_session;
2741
2742 if (use_tmp_output) {
2743 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2744 wait, nb_streams);
2745 if (ret != LTTNG_OK) {
2746 goto error;
2747 }
2748 snapshot_success = 1;
2749 } else {
2750 struct snapshot_output *sout;
2751 struct lttng_ht_iter iter;
2752
2753 rcu_read_lock();
2754 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2755 &iter.iter, sout, node.node) {
2756 /*
2757 * Make a local copy of the output and assign the possible
2758 * temporary value given by the caller.
2759 */
2760 memset(&tmp_output, 0, sizeof(tmp_output));
2761 memcpy(&tmp_output, sout, sizeof(tmp_output));
2762
2763 /* Use temporary max size. */
2764 if (output->max_size != (uint64_t) -1ULL) {
2765 tmp_output.max_size = output->max_size;
2766 }
2767
2768 /* Use temporary name. */
2769 if (*output->name != '\0') {
2770 strncpy(tmp_output.name, output->name,
2771 sizeof(tmp_output.name));
2772 }
2773
2774 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2775
2776 ret = record_kernel_snapshot(ksess, &tmp_output,
2777 session, wait, nb_streams);
2778 if (ret != LTTNG_OK) {
2779 rcu_read_unlock();
2780 goto error;
2781 }
2782 snapshot_success = 1;
2783 }
2784 rcu_read_unlock();
2785 }
2786 }
2787
2788 if (session->ust_session) {
2789 struct ltt_ust_session *usess = session->ust_session;
2790
2791 if (use_tmp_output) {
2792 ret = record_ust_snapshot(usess, &tmp_output, session,
2793 wait, nb_streams);
2794 if (ret != LTTNG_OK) {
2795 goto error;
2796 }
2797 snapshot_success = 1;
2798 } else {
2799 struct snapshot_output *sout;
2800 struct lttng_ht_iter iter;
2801
2802 rcu_read_lock();
2803 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2804 &iter.iter, sout, node.node) {
2805 /*
2806 * Make a local copy of the output and assign the possible
2807 * temporary value given by the caller.
2808 */
2809 memset(&tmp_output, 0, sizeof(tmp_output));
2810 memcpy(&tmp_output, sout, sizeof(tmp_output));
2811
2812 /* Use temporary max size. */
2813 if (output->max_size != (uint64_t) -1ULL) {
2814 tmp_output.max_size = output->max_size;
2815 }
2816
2817 /* Use temporary name. */
2818 if (*output->name != '\0') {
2819 strncpy(tmp_output.name, output->name,
2820 sizeof(tmp_output.name));
2821 }
2822
2823 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2824
2825 ret = record_ust_snapshot(usess, &tmp_output, session,
2826 wait, nb_streams);
2827 if (ret != LTTNG_OK) {
2828 rcu_read_unlock();
2829 goto error;
2830 }
2831 snapshot_success = 1;
2832 }
2833 rcu_read_unlock();
2834 }
2835 }
2836
2837 if (snapshot_success) {
2838 session->snapshot.nb_snapshot++;
2839 }
2840
2841 error:
2842 return ret;
2843 }
2844
2845 /*
2846 * Init command subsystem.
2847 */
2848 void cmd_init(void)
2849 {
2850 /*
2851 * Set network sequence index to 1 for streams to match a relayd
2852 * socket on the consumer side.
2853 */
2854 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2855 relayd_net_seq_idx = 1;
2856 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2857
2858 DBG("Command subsystem initialized");
2859 }
LTTng 2.0 tools and control repository
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