e5b2b7e3c8f606677d4bc03adfabf34691b20c52
[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 {
552 int ret;
553 struct lttcomm_relayd_sock *rsock = NULL;
554
555 /* Connect to relayd and make version check if uri is the control. */
556 ret = create_connect_relayd(relayd_uri, &rsock);
557 if (ret != LTTNG_OK) {
558 goto error;
559 }
560 assert(rsock);
561
562 /* Set the network sequence index if not set. */
563 if (consumer->net_seq_index == (uint64_t) -1ULL) {
564 pthread_mutex_lock(&relayd_net_seq_idx_lock);
565 /*
566 * Increment net_seq_idx because we are about to transfer the
567 * new relayd socket to the consumer.
568 * Assign unique key so the consumer can match streams.
569 */
570 consumer->net_seq_index = ++relayd_net_seq_idx;
571 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
572 }
573
574 /* Send relayd socket to consumer. */
575 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
576 relayd_uri->stype, session_id);
577 if (ret < 0) {
578 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
579 goto close_sock;
580 }
581
582 /* Flag that the corresponding socket was sent. */
583 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
584 consumer_sock->control_sock_sent = 1;
585 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
586 consumer_sock->data_sock_sent = 1;
587 }
588
589 ret = LTTNG_OK;
590
591 /*
592 * Close socket which was dup on the consumer side. The session daemon does
593 * NOT keep track of the relayd socket(s) once transfer to the consumer.
594 */
595
596 close_sock:
597 (void) relayd_close(rsock);
598 free(rsock);
599
600 error:
601 if (ret != LTTNG_OK) {
602 /*
603 * The consumer output for this session should not be used anymore
604 * since the relayd connection failed thus making any tracing or/and
605 * streaming not usable.
606 */
607 consumer->enabled = 0;
608 }
609 return ret;
610 }
611
612 /*
613 * Send both relayd sockets to a specific consumer and domain. This is a
614 * helper function to facilitate sending the information to the consumer for a
615 * session.
616 */
617 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
618 struct consumer_output *consumer, struct consumer_socket *sock)
619 {
620 int ret = LTTNG_OK;
621
622 assert(consumer);
623 assert(sock);
624
625 /* Sending control relayd socket. */
626 if (!sock->control_sock_sent) {
627 ret = send_consumer_relayd_socket(domain, session_id,
628 &consumer->dst.net.control, consumer, sock);
629 if (ret != LTTNG_OK) {
630 goto error;
631 }
632 }
633
634 /* Sending data relayd socket. */
635 if (!sock->data_sock_sent) {
636 ret = send_consumer_relayd_socket(domain, session_id,
637 &consumer->dst.net.data, consumer, sock);
638 if (ret != LTTNG_OK) {
639 goto error;
640 }
641 }
642
643 error:
644 return ret;
645 }
646
647 /*
648 * Setup relayd connections for a tracing session. First creates the socket to
649 * the relayd and send them to the right domain consumer. Consumer type MUST be
650 * network.
651 */
652 int cmd_setup_relayd(struct ltt_session *session)
653 {
654 int ret = LTTNG_OK;
655 struct ltt_ust_session *usess;
656 struct ltt_kernel_session *ksess;
657 struct consumer_socket *socket;
658 struct lttng_ht_iter iter;
659
660 assert(session);
661
662 usess = session->ust_session;
663 ksess = session->kernel_session;
664
665 DBG("Setting relayd for session %s", session->name);
666
667 rcu_read_lock();
668
669 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
670 && usess->consumer->enabled) {
671 /* For each consumer socket, send relayd sockets */
672 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
673 socket, node.node) {
674 pthread_mutex_lock(socket->lock);
675 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
676 usess->consumer, socket);
677 pthread_mutex_unlock(socket->lock);
678 if (ret != LTTNG_OK) {
679 goto error;
680 }
681 /* Session is now ready for network streaming. */
682 session->net_handle = 1;
683 }
684 }
685
686 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
687 && ksess->consumer->enabled) {
688 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
689 socket, node.node) {
690 pthread_mutex_lock(socket->lock);
691 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
692 ksess->consumer, socket);
693 pthread_mutex_unlock(socket->lock);
694 if (ret != LTTNG_OK) {
695 goto error;
696 }
697 /* Session is now ready for network streaming. */
698 session->net_handle = 1;
699 }
700 }
701
702 error:
703 rcu_read_unlock();
704 return ret;
705 }
706
707 /*
708 * Start a kernel session by opening all necessary streams.
709 */
710 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
711 {
712 int ret;
713 struct ltt_kernel_channel *kchan;
714
715 /* Open kernel metadata */
716 if (ksess->metadata == NULL && ksess->output_traces) {
717 ret = kernel_open_metadata(ksess);
718 if (ret < 0) {
719 ret = LTTNG_ERR_KERN_META_FAIL;
720 goto error;
721 }
722 }
723
724 /* Open kernel metadata stream */
725 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
726 ret = kernel_open_metadata_stream(ksess);
727 if (ret < 0) {
728 ERR("Kernel create metadata stream failed");
729 ret = LTTNG_ERR_KERN_STREAM_FAIL;
730 goto error;
731 }
732 }
733
734 /* For each channel */
735 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
736 if (kchan->stream_count == 0) {
737 ret = kernel_open_channel_stream(kchan);
738 if (ret < 0) {
739 ret = LTTNG_ERR_KERN_STREAM_FAIL;
740 goto error;
741 }
742 /* Update the stream global counter */
743 ksess->stream_count_global += ret;
744 }
745 }
746
747 /* Setup kernel consumer socket and send fds to it */
748 ret = init_kernel_tracing(ksess);
749 if (ret != 0) {
750 ret = LTTNG_ERR_KERN_START_FAIL;
751 goto error;
752 }
753
754 /* This start the kernel tracing */
755 ret = kernel_start_session(ksess);
756 if (ret < 0) {
757 ret = LTTNG_ERR_KERN_START_FAIL;
758 goto error;
759 }
760
761 /* Quiescent wait after starting trace */
762 kernel_wait_quiescent(kernel_tracer_fd);
763
764 ksess->started = 1;
765
766 ret = LTTNG_OK;
767
768 error:
769 return ret;
770 }
771
772 /*
773 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
774 */
775 int cmd_disable_channel(struct ltt_session *session, int domain,
776 char *channel_name)
777 {
778 int ret;
779 struct ltt_ust_session *usess;
780
781 usess = session->ust_session;
782
783 rcu_read_lock();
784
785 switch (domain) {
786 case LTTNG_DOMAIN_KERNEL:
787 {
788 ret = channel_kernel_disable(session->kernel_session,
789 channel_name);
790 if (ret != LTTNG_OK) {
791 goto error;
792 }
793
794 kernel_wait_quiescent(kernel_tracer_fd);
795 break;
796 }
797 case LTTNG_DOMAIN_UST:
798 {
799 struct ltt_ust_channel *uchan;
800 struct lttng_ht *chan_ht;
801
802 chan_ht = usess->domain_global.channels;
803
804 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
805 if (uchan == NULL) {
806 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
807 goto error;
808 }
809
810 ret = channel_ust_disable(usess, uchan);
811 if (ret != LTTNG_OK) {
812 goto error;
813 }
814 break;
815 }
816 #if 0
817 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
818 case LTTNG_DOMAIN_UST_EXEC_NAME:
819 case LTTNG_DOMAIN_UST_PID:
820 #endif
821 default:
822 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
823 goto error;
824 }
825
826 ret = LTTNG_OK;
827
828 error:
829 rcu_read_unlock();
830 return ret;
831 }
832
833 /*
834 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
835 *
836 * The wpipe arguments is used as a notifier for the kernel thread.
837 */
838 int cmd_enable_channel(struct ltt_session *session,
839 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
840 {
841 int ret;
842 struct ltt_ust_session *usess = session->ust_session;
843 struct lttng_ht *chan_ht;
844
845 assert(session);
846 assert(attr);
847 assert(domain);
848
849 DBG("Enabling channel %s for session %s", attr->name, session->name);
850
851 rcu_read_lock();
852
853 switch (domain->type) {
854 case LTTNG_DOMAIN_KERNEL:
855 {
856 struct ltt_kernel_channel *kchan;
857
858 kchan = trace_kernel_get_channel_by_name(attr->name,
859 session->kernel_session);
860 if (kchan == NULL) {
861 /*
862 * Don't try to create a channel if the session
863 * has been started at some point in time
864 * before. The tracer does not allow it.
865 */
866 if (session->started) {
867 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
868 goto error;
869 }
870 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
871 if (attr->name[0] != '\0') {
872 session->kernel_session->has_non_default_channel = 1;
873 }
874 } else {
875 ret = channel_kernel_enable(session->kernel_session, kchan);
876 }
877
878 if (ret != LTTNG_OK) {
879 goto error;
880 }
881
882 kernel_wait_quiescent(kernel_tracer_fd);
883 break;
884 }
885 case LTTNG_DOMAIN_UST:
886 {
887 struct ltt_ust_channel *uchan;
888
889 chan_ht = usess->domain_global.channels;
890
891 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
892 if (uchan == NULL) {
893 /*
894 * Don't try to create a channel if the session
895 * has been started at some point in time
896 * before. The tracer does not allow it.
897 */
898 if (session->started) {
899 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
900 goto error;
901 }
902 ret = channel_ust_create(usess, attr, domain->buf_type);
903 if (attr->name[0] != '\0') {
904 usess->has_non_default_channel = 1;
905 }
906 } else {
907 ret = channel_ust_enable(usess, uchan);
908 }
909 break;
910 }
911 default:
912 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
913 goto error;
914 }
915
916 error:
917 rcu_read_unlock();
918 return ret;
919 }
920
921
922 /*
923 * Command LTTNG_DISABLE_EVENT processed by the client thread.
924 */
925 int cmd_disable_event(struct ltt_session *session, int domain,
926 char *channel_name, char *event_name)
927 {
928 int ret;
929
930 rcu_read_lock();
931
932 switch (domain) {
933 case LTTNG_DOMAIN_KERNEL:
934 {
935 struct ltt_kernel_channel *kchan;
936 struct ltt_kernel_session *ksess;
937
938 ksess = session->kernel_session;
939
940 /*
941 * If a non-default channel has been created in the
942 * session, explicitely require that -c chan_name needs
943 * to be provided.
944 */
945 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
946 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
947 goto error;
948 }
949
950 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
951 if (kchan == NULL) {
952 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
953 goto error;
954 }
955
956 ret = event_kernel_disable_tracepoint(kchan, event_name);
957 if (ret != LTTNG_OK) {
958 goto error;
959 }
960
961 kernel_wait_quiescent(kernel_tracer_fd);
962 break;
963 }
964 case LTTNG_DOMAIN_UST:
965 {
966 struct ltt_ust_channel *uchan;
967 struct ltt_ust_session *usess;
968
969 usess = session->ust_session;
970
971 /*
972 * If a non-default channel has been created in the
973 * session, explicitely require that -c chan_name needs
974 * to be provided.
975 */
976 if (usess->has_non_default_channel && channel_name[0] == '\0') {
977 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
978 goto error;
979 }
980
981 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
982 channel_name);
983 if (uchan == NULL) {
984 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
985 goto error;
986 }
987
988 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
989 if (ret != LTTNG_OK) {
990 goto error;
991 }
992
993 DBG3("Disable UST event %s in channel %s completed", event_name,
994 channel_name);
995 break;
996 }
997 #if 0
998 case LTTNG_DOMAIN_UST_EXEC_NAME:
999 case LTTNG_DOMAIN_UST_PID:
1000 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1001 #endif
1002 default:
1003 ret = LTTNG_ERR_UND;
1004 goto error;
1005 }
1006
1007 ret = LTTNG_OK;
1008
1009 error:
1010 rcu_read_unlock();
1011 return ret;
1012 }
1013
1014 /*
1015 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1016 */
1017 int cmd_disable_event_all(struct ltt_session *session, int domain,
1018 char *channel_name)
1019 {
1020 int ret;
1021
1022 rcu_read_lock();
1023
1024 switch (domain) {
1025 case LTTNG_DOMAIN_KERNEL:
1026 {
1027 struct ltt_kernel_session *ksess;
1028 struct ltt_kernel_channel *kchan;
1029
1030 ksess = session->kernel_session;
1031
1032 /*
1033 * If a non-default channel has been created in the
1034 * session, explicitely require that -c chan_name needs
1035 * to be provided.
1036 */
1037 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1038 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1039 goto error;
1040 }
1041
1042 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1043 if (kchan == NULL) {
1044 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1045 goto error;
1046 }
1047
1048 ret = event_kernel_disable_all(kchan);
1049 if (ret != LTTNG_OK) {
1050 goto error;
1051 }
1052
1053 kernel_wait_quiescent(kernel_tracer_fd);
1054 break;
1055 }
1056 case LTTNG_DOMAIN_UST:
1057 {
1058 struct ltt_ust_session *usess;
1059 struct ltt_ust_channel *uchan;
1060
1061 usess = session->ust_session;
1062
1063 /*
1064 * If a non-default channel has been created in the
1065 * session, explicitely require that -c chan_name needs
1066 * to be provided.
1067 */
1068 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1069 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1070 goto error;
1071 }
1072
1073 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1074 channel_name);
1075 if (uchan == NULL) {
1076 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1077 goto error;
1078 }
1079
1080 ret = event_ust_disable_all_tracepoints(usess, uchan);
1081 if (ret != 0) {
1082 goto error;
1083 }
1084
1085 DBG3("Disable all UST events in channel %s completed", channel_name);
1086
1087 break;
1088 }
1089 #if 0
1090 case LTTNG_DOMAIN_UST_EXEC_NAME:
1091 case LTTNG_DOMAIN_UST_PID:
1092 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1093 #endif
1094 default:
1095 ret = LTTNG_ERR_UND;
1096 goto error;
1097 }
1098
1099 ret = LTTNG_OK;
1100
1101 error:
1102 rcu_read_unlock();
1103 return ret;
1104 }
1105
1106 /*
1107 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1108 */
1109 int cmd_add_context(struct ltt_session *session, int domain,
1110 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1111 {
1112 int ret, chan_kern_created = 0, chan_ust_created = 0;
1113
1114 switch (domain) {
1115 case LTTNG_DOMAIN_KERNEL:
1116 assert(session->kernel_session);
1117
1118 if (session->kernel_session->channel_count == 0) {
1119 /* Create default channel */
1120 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1121 if (ret != LTTNG_OK) {
1122 goto error;
1123 }
1124 chan_kern_created = 1;
1125 }
1126 /* Add kernel context to kernel tracer */
1127 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1128 if (ret != LTTNG_OK) {
1129 goto error;
1130 }
1131 break;
1132 case LTTNG_DOMAIN_UST:
1133 {
1134 struct ltt_ust_session *usess = session->ust_session;
1135 unsigned int chan_count;
1136
1137 assert(usess);
1138
1139 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1140 if (chan_count == 0) {
1141 struct lttng_channel *attr;
1142 /* Create default channel */
1143 attr = channel_new_default_attr(domain, usess->buffer_type);
1144 if (attr == NULL) {
1145 ret = LTTNG_ERR_FATAL;
1146 goto error;
1147 }
1148
1149 ret = channel_ust_create(usess, attr, usess->buffer_type);
1150 if (ret != LTTNG_OK) {
1151 free(attr);
1152 goto error;
1153 }
1154 free(attr);
1155 chan_ust_created = 1;
1156 }
1157
1158 ret = context_ust_add(usess, domain, ctx, channel_name);
1159 if (ret != LTTNG_OK) {
1160 goto error;
1161 }
1162 break;
1163 }
1164 #if 0
1165 case LTTNG_DOMAIN_UST_EXEC_NAME:
1166 case LTTNG_DOMAIN_UST_PID:
1167 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1168 #endif
1169 default:
1170 ret = LTTNG_ERR_UND;
1171 goto error;
1172 }
1173
1174 return LTTNG_OK;
1175
1176 error:
1177 if (chan_kern_created) {
1178 struct ltt_kernel_channel *kchan =
1179 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1180 session->kernel_session);
1181 /* Created previously, this should NOT fail. */
1182 assert(kchan);
1183 kernel_destroy_channel(kchan);
1184 }
1185
1186 if (chan_ust_created) {
1187 struct ltt_ust_channel *uchan =
1188 trace_ust_find_channel_by_name(
1189 session->ust_session->domain_global.channels,
1190 DEFAULT_CHANNEL_NAME);
1191 /* Created previously, this should NOT fail. */
1192 assert(uchan);
1193 /* Remove from the channel list of the session. */
1194 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1195 uchan);
1196 trace_ust_destroy_channel(uchan);
1197 }
1198 return ret;
1199 }
1200
1201 /*
1202 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1203 */
1204 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1205 char *channel_name, struct lttng_event *event,
1206 struct lttng_filter_bytecode *filter, int wpipe)
1207 {
1208 int ret, channel_created = 0;
1209 struct lttng_channel *attr;
1210
1211 assert(session);
1212 assert(event);
1213 assert(channel_name);
1214
1215 rcu_read_lock();
1216
1217 switch (domain->type) {
1218 case LTTNG_DOMAIN_KERNEL:
1219 {
1220 struct ltt_kernel_channel *kchan;
1221
1222 /*
1223 * If a non-default channel has been created in the
1224 * session, explicitely require that -c chan_name needs
1225 * to be provided.
1226 */
1227 if (session->kernel_session->has_non_default_channel
1228 && channel_name[0] == '\0') {
1229 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1230 goto error;
1231 }
1232
1233 kchan = trace_kernel_get_channel_by_name(channel_name,
1234 session->kernel_session);
1235 if (kchan == NULL) {
1236 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1237 LTTNG_BUFFER_GLOBAL);
1238 if (attr == NULL) {
1239 ret = LTTNG_ERR_FATAL;
1240 goto error;
1241 }
1242 strncpy(attr->name, channel_name, sizeof(attr->name));
1243
1244 ret = cmd_enable_channel(session, domain, attr, wpipe);
1245 if (ret != LTTNG_OK) {
1246 free(attr);
1247 goto error;
1248 }
1249 free(attr);
1250
1251 channel_created = 1;
1252 }
1253
1254 /* Get the newly created kernel channel pointer */
1255 kchan = trace_kernel_get_channel_by_name(channel_name,
1256 session->kernel_session);
1257 if (kchan == NULL) {
1258 /* This sould not happen... */
1259 ret = LTTNG_ERR_FATAL;
1260 goto error;
1261 }
1262
1263 ret = event_kernel_enable_tracepoint(kchan, event);
1264 if (ret != LTTNG_OK) {
1265 if (channel_created) {
1266 /* Let's not leak a useless channel. */
1267 kernel_destroy_channel(kchan);
1268 }
1269 goto error;
1270 }
1271
1272 kernel_wait_quiescent(kernel_tracer_fd);
1273 break;
1274 }
1275 case LTTNG_DOMAIN_UST:
1276 {
1277 struct ltt_ust_channel *uchan;
1278 struct ltt_ust_session *usess = session->ust_session;
1279
1280 assert(usess);
1281
1282 /*
1283 * If a non-default channel has been created in the
1284 * session, explicitely require that -c chan_name needs
1285 * to be provided.
1286 */
1287 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1288 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1289 goto error;
1290 }
1291
1292 /* Get channel from global UST domain */
1293 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1294 channel_name);
1295 if (uchan == NULL) {
1296 /* Create default channel */
1297 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1298 usess->buffer_type);
1299 if (attr == NULL) {
1300 ret = LTTNG_ERR_FATAL;
1301 goto error;
1302 }
1303 strncpy(attr->name, channel_name, sizeof(attr->name));
1304
1305 ret = cmd_enable_channel(session, domain, attr, wpipe);
1306 if (ret != LTTNG_OK) {
1307 free(attr);
1308 goto error;
1309 }
1310 free(attr);
1311
1312 /* Get the newly created channel reference back */
1313 uchan = trace_ust_find_channel_by_name(
1314 usess->domain_global.channels, channel_name);
1315 assert(uchan);
1316 }
1317
1318 /* At this point, the session and channel exist on the tracer */
1319 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1320 if (ret != LTTNG_OK) {
1321 goto error;
1322 }
1323 break;
1324 }
1325 #if 0
1326 case LTTNG_DOMAIN_UST_EXEC_NAME:
1327 case LTTNG_DOMAIN_UST_PID:
1328 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1329 #endif
1330 default:
1331 ret = LTTNG_ERR_UND;
1332 goto error;
1333 }
1334
1335 ret = LTTNG_OK;
1336
1337 error:
1338 rcu_read_unlock();
1339 return ret;
1340 }
1341
1342 /*
1343 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1344 */
1345 int cmd_enable_event_all(struct ltt_session *session,
1346 struct lttng_domain *domain, char *channel_name, int event_type,
1347 struct lttng_filter_bytecode *filter, int wpipe)
1348 {
1349 int ret;
1350 struct lttng_channel *attr;
1351
1352 assert(session);
1353 assert(channel_name);
1354
1355 rcu_read_lock();
1356
1357 switch (domain->type) {
1358 case LTTNG_DOMAIN_KERNEL:
1359 {
1360 struct ltt_kernel_channel *kchan;
1361
1362 assert(session->kernel_session);
1363
1364 /*
1365 * If a non-default channel has been created in the
1366 * session, explicitely require that -c chan_name needs
1367 * to be provided.
1368 */
1369 if (session->kernel_session->has_non_default_channel
1370 && channel_name[0] == '\0') {
1371 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1372 goto error;
1373 }
1374
1375 kchan = trace_kernel_get_channel_by_name(channel_name,
1376 session->kernel_session);
1377 if (kchan == NULL) {
1378 /* Create default channel */
1379 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1380 LTTNG_BUFFER_GLOBAL);
1381 if (attr == NULL) {
1382 ret = LTTNG_ERR_FATAL;
1383 goto error;
1384 }
1385 strncpy(attr->name, channel_name, sizeof(attr->name));
1386
1387 ret = cmd_enable_channel(session, domain, attr, wpipe);
1388 if (ret != LTTNG_OK) {
1389 free(attr);
1390 goto error;
1391 }
1392 free(attr);
1393
1394 /* Get the newly created kernel channel pointer */
1395 kchan = trace_kernel_get_channel_by_name(channel_name,
1396 session->kernel_session);
1397 assert(kchan);
1398 }
1399
1400 switch (event_type) {
1401 case LTTNG_EVENT_SYSCALL:
1402 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1403 break;
1404 case LTTNG_EVENT_TRACEPOINT:
1405 /*
1406 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1407 * events already registered to the channel.
1408 */
1409 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1410 break;
1411 case LTTNG_EVENT_ALL:
1412 /* Enable syscalls and tracepoints */
1413 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1414 break;
1415 default:
1416 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1417 goto error;
1418 }
1419
1420 /* Manage return value */
1421 if (ret != LTTNG_OK) {
1422 /*
1423 * On error, cmd_enable_channel call will take care of destroying
1424 * the created channel if it was needed.
1425 */
1426 goto error;
1427 }
1428
1429 kernel_wait_quiescent(kernel_tracer_fd);
1430 break;
1431 }
1432 case LTTNG_DOMAIN_UST:
1433 {
1434 struct ltt_ust_channel *uchan;
1435 struct ltt_ust_session *usess = session->ust_session;
1436
1437 assert(usess);
1438
1439 /*
1440 * If a non-default channel has been created in the
1441 * session, explicitely require that -c chan_name needs
1442 * to be provided.
1443 */
1444 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1445 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1446 goto error;
1447 }
1448
1449 /* Get channel from global UST domain */
1450 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1451 channel_name);
1452 if (uchan == NULL) {
1453 /* Create default channel */
1454 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1455 usess->buffer_type);
1456 if (attr == NULL) {
1457 ret = LTTNG_ERR_FATAL;
1458 goto error;
1459 }
1460 strncpy(attr->name, channel_name, sizeof(attr->name));
1461
1462 ret = cmd_enable_channel(session, domain, attr, wpipe);
1463 if (ret != LTTNG_OK) {
1464 free(attr);
1465 goto error;
1466 }
1467 free(attr);
1468
1469 /* Get the newly created channel reference back */
1470 uchan = trace_ust_find_channel_by_name(
1471 usess->domain_global.channels, channel_name);
1472 assert(uchan);
1473 }
1474
1475 /* At this point, the session and channel exist on the tracer */
1476
1477 switch (event_type) {
1478 case LTTNG_EVENT_ALL:
1479 case LTTNG_EVENT_TRACEPOINT:
1480 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1481 if (ret != LTTNG_OK) {
1482 goto error;
1483 }
1484 break;
1485 default:
1486 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1487 goto error;
1488 }
1489
1490 /* Manage return value */
1491 if (ret != LTTNG_OK) {
1492 goto error;
1493 }
1494
1495 break;
1496 }
1497 #if 0
1498 case LTTNG_DOMAIN_UST_EXEC_NAME:
1499 case LTTNG_DOMAIN_UST_PID:
1500 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1501 #endif
1502 default:
1503 ret = LTTNG_ERR_UND;
1504 goto error;
1505 }
1506
1507 ret = LTTNG_OK;
1508
1509 error:
1510 rcu_read_unlock();
1511 return ret;
1512 }
1513
1514
1515 /*
1516 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1517 */
1518 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1519 {
1520 int ret;
1521 ssize_t nb_events = 0;
1522
1523 switch (domain) {
1524 case LTTNG_DOMAIN_KERNEL:
1525 nb_events = kernel_list_events(kernel_tracer_fd, events);
1526 if (nb_events < 0) {
1527 ret = LTTNG_ERR_KERN_LIST_FAIL;
1528 goto error;
1529 }
1530 break;
1531 case LTTNG_DOMAIN_UST:
1532 nb_events = ust_app_list_events(events);
1533 if (nb_events < 0) {
1534 ret = LTTNG_ERR_UST_LIST_FAIL;
1535 goto error;
1536 }
1537 break;
1538 default:
1539 ret = LTTNG_ERR_UND;
1540 goto error;
1541 }
1542
1543 return nb_events;
1544
1545 error:
1546 /* Return negative value to differentiate return code */
1547 return -ret;
1548 }
1549
1550 /*
1551 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1552 */
1553 ssize_t cmd_list_tracepoint_fields(int domain,
1554 struct lttng_event_field **fields)
1555 {
1556 int ret;
1557 ssize_t nb_fields = 0;
1558
1559 switch (domain) {
1560 case LTTNG_DOMAIN_UST:
1561 nb_fields = ust_app_list_event_fields(fields);
1562 if (nb_fields < 0) {
1563 ret = LTTNG_ERR_UST_LIST_FAIL;
1564 goto error;
1565 }
1566 break;
1567 case LTTNG_DOMAIN_KERNEL:
1568 default: /* fall-through */
1569 ret = LTTNG_ERR_UND;
1570 goto error;
1571 }
1572
1573 return nb_fields;
1574
1575 error:
1576 /* Return negative value to differentiate return code */
1577 return -ret;
1578 }
1579
1580 /*
1581 * Command LTTNG_START_TRACE processed by the client thread.
1582 */
1583 int cmd_start_trace(struct ltt_session *session)
1584 {
1585 int ret;
1586 struct ltt_kernel_session *ksession;
1587 struct ltt_ust_session *usess;
1588
1589 assert(session);
1590
1591 /* Ease our life a bit ;) */
1592 ksession = session->kernel_session;
1593 usess = session->ust_session;
1594
1595 if (session->enabled) {
1596 /* Already started. */
1597 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1598 goto error;
1599 }
1600
1601 session->enabled = 1;
1602
1603 /* Kernel tracing */
1604 if (ksession != NULL) {
1605 ret = start_kernel_session(ksession, kernel_tracer_fd);
1606 if (ret != LTTNG_OK) {
1607 goto error;
1608 }
1609 }
1610
1611 /* Flag session that trace should start automatically */
1612 if (usess) {
1613 usess->start_trace = 1;
1614
1615 ret = ust_app_start_trace_all(usess);
1616 if (ret < 0) {
1617 ret = LTTNG_ERR_UST_START_FAIL;
1618 goto error;
1619 }
1620 }
1621
1622 session->started = 1;
1623
1624 ret = LTTNG_OK;
1625
1626 error:
1627 return ret;
1628 }
1629
1630 /*
1631 * Command LTTNG_STOP_TRACE processed by the client thread.
1632 */
1633 int cmd_stop_trace(struct ltt_session *session)
1634 {
1635 int ret;
1636 struct ltt_kernel_channel *kchan;
1637 struct ltt_kernel_session *ksession;
1638 struct ltt_ust_session *usess;
1639
1640 assert(session);
1641
1642 /* Short cut */
1643 ksession = session->kernel_session;
1644 usess = session->ust_session;
1645
1646 if (!session->enabled) {
1647 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1648 goto error;
1649 }
1650
1651 session->enabled = 0;
1652
1653 /* Kernel tracer */
1654 if (ksession && ksession->started) {
1655 DBG("Stop kernel tracing");
1656
1657 /* Flush metadata if exist */
1658 if (ksession->metadata_stream_fd >= 0) {
1659 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1660 if (ret < 0) {
1661 ERR("Kernel metadata flush failed");
1662 }
1663 }
1664
1665 /* Flush all buffers before stopping */
1666 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1667 ret = kernel_flush_buffer(kchan);
1668 if (ret < 0) {
1669 ERR("Kernel flush buffer error");
1670 }
1671 }
1672
1673 ret = kernel_stop_session(ksession);
1674 if (ret < 0) {
1675 ret = LTTNG_ERR_KERN_STOP_FAIL;
1676 goto error;
1677 }
1678
1679 kernel_wait_quiescent(kernel_tracer_fd);
1680
1681 ksession->started = 0;
1682 }
1683
1684 if (usess && usess->start_trace) {
1685 usess->start_trace = 0;
1686
1687 ret = ust_app_stop_trace_all(usess);
1688 if (ret < 0) {
1689 ret = LTTNG_ERR_UST_STOP_FAIL;
1690 goto error;
1691 }
1692 }
1693
1694 ret = LTTNG_OK;
1695
1696 error:
1697 return ret;
1698 }
1699
1700 /*
1701 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1702 */
1703 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1704 size_t nb_uri, struct lttng_uri *uris)
1705 {
1706 int ret, i;
1707 struct ltt_kernel_session *ksess = session->kernel_session;
1708 struct ltt_ust_session *usess = session->ust_session;
1709 struct consumer_output *consumer = NULL;
1710
1711 assert(session);
1712 assert(uris);
1713 assert(nb_uri > 0);
1714
1715 /* Can't enable consumer after session started. */
1716 if (session->enabled) {
1717 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1718 goto error;
1719 }
1720
1721 /*
1722 * This case switch makes sure the domain session has a temporary consumer
1723 * so the URL can be set.
1724 */
1725 switch (domain) {
1726 case 0:
1727 /* Code flow error. A session MUST always have a consumer object */
1728 assert(session->consumer);
1729 /*
1730 * The URL will be added to the tracing session consumer instead of a
1731 * specific domain consumer.
1732 */
1733 consumer = session->consumer;
1734 break;
1735 case LTTNG_DOMAIN_KERNEL:
1736 /* Code flow error if we don't have a kernel session here. */
1737 assert(ksess);
1738 assert(ksess->consumer);
1739 consumer = ksess->consumer;
1740 break;
1741 case LTTNG_DOMAIN_UST:
1742 /* Code flow error if we don't have a kernel session here. */
1743 assert(usess);
1744 assert(usess->consumer);
1745 consumer = usess->consumer;
1746 break;
1747 }
1748
1749 for (i = 0; i < nb_uri; i++) {
1750 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1751 if (ret != LTTNG_OK) {
1752 goto error;
1753 }
1754 }
1755
1756 /* All good! */
1757 ret = LTTNG_OK;
1758
1759 error:
1760 return ret;
1761 }
1762
1763 /*
1764 * Command LTTNG_CREATE_SESSION processed by the client thread.
1765 */
1766 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1767 size_t nb_uri, lttng_sock_cred *creds)
1768 {
1769 int ret;
1770 struct ltt_session *session;
1771
1772 assert(name);
1773 assert(creds);
1774
1775 /*
1776 * Verify if the session already exist
1777 *
1778 * XXX: There is no need for the session lock list here since the caller
1779 * (process_client_msg) is holding it. We might want to change that so a
1780 * single command does not lock the entire session list.
1781 */
1782 session = session_find_by_name(name);
1783 if (session != NULL) {
1784 ret = LTTNG_ERR_EXIST_SESS;
1785 goto find_error;
1786 }
1787
1788 /* Create tracing session in the registry */
1789 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1790 LTTNG_SOCK_GET_GID_CRED(creds));
1791 if (ret != LTTNG_OK) {
1792 goto session_error;
1793 }
1794
1795 /*
1796 * Get the newly created session pointer back
1797 *
1798 * XXX: There is no need for the session lock list here since the caller
1799 * (process_client_msg) is holding it. We might want to change that so a
1800 * single command does not lock the entire session list.
1801 */
1802 session = session_find_by_name(name);
1803 assert(session);
1804
1805 /* Create default consumer output for the session not yet created. */
1806 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1807 if (session->consumer == NULL) {
1808 ret = LTTNG_ERR_FATAL;
1809 goto consumer_error;
1810 }
1811
1812 if (uris) {
1813 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1814 if (ret != LTTNG_OK) {
1815 goto consumer_error;
1816 }
1817 session->output_traces = 1;
1818 } else {
1819 session->output_traces = 0;
1820 DBG2("Session %s created with no output", session->name);
1821 }
1822
1823 session->consumer->enabled = 1;
1824
1825 return LTTNG_OK;
1826
1827 consumer_error:
1828 session_destroy(session);
1829 session_error:
1830 find_error:
1831 return ret;
1832 }
1833
1834 /*
1835 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1836 */
1837 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
1838 size_t nb_uri, lttng_sock_cred *creds)
1839 {
1840 int ret;
1841 struct ltt_session *session;
1842 struct snapshot_output *new_output = NULL;
1843
1844 assert(name);
1845 assert(creds);
1846
1847 /*
1848 * Create session in no output mode with URIs set to NULL. The uris we've
1849 * received are for a default snapshot output if one.
1850 */
1851 ret = cmd_create_session_uri(name, NULL, 0, creds);
1852 if (ret != LTTNG_OK) {
1853 goto error;
1854 }
1855
1856 /* Get the newly created session pointer back. This should NEVER fail. */
1857 session = session_find_by_name(name);
1858 assert(session);
1859
1860 /* Flag session for snapshot mode. */
1861 session->snapshot_mode = 1;
1862
1863 /* Skip snapshot output creation if no URI is given. */
1864 if (nb_uri == 0) {
1865 goto end;
1866 }
1867
1868 new_output = snapshot_output_alloc();
1869 if (!new_output) {
1870 ret = LTTNG_ERR_NOMEM;
1871 goto error_snapshot_alloc;
1872 }
1873
1874 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
1875 uris, nb_uri, session->consumer, new_output, &session->snapshot);
1876 if (ret < 0) {
1877 if (ret == -ENOMEM) {
1878 ret = LTTNG_ERR_NOMEM;
1879 } else {
1880 ret = LTTNG_ERR_INVALID;
1881 }
1882 goto error_snapshot;
1883 }
1884
1885 rcu_read_lock();
1886 snapshot_add_output(&session->snapshot, new_output);
1887 rcu_read_unlock();
1888
1889 end:
1890 return LTTNG_OK;
1891
1892 error_snapshot:
1893 snapshot_output_destroy(new_output);
1894 error_snapshot_alloc:
1895 session_destroy(session);
1896 error:
1897 return ret;
1898 }
1899
1900 /*
1901 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1902 */
1903 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1904 {
1905 int ret;
1906 struct ltt_ust_session *usess;
1907 struct ltt_kernel_session *ksess;
1908
1909 /* Safety net */
1910 assert(session);
1911
1912 usess = session->ust_session;
1913 ksess = session->kernel_session;
1914
1915 /* Clean kernel session teardown */
1916 kernel_destroy_session(ksess);
1917
1918 /* UST session teardown */
1919 if (usess) {
1920 /* Close any relayd session */
1921 consumer_output_send_destroy_relayd(usess->consumer);
1922
1923 /* Destroy every UST application related to this session. */
1924 ret = ust_app_destroy_trace_all(usess);
1925 if (ret) {
1926 ERR("Error in ust_app_destroy_trace_all");
1927 }
1928
1929 /* Clean up the rest. */
1930 trace_ust_destroy_session(usess);
1931 }
1932
1933 /*
1934 * Must notify the kernel thread here to update it's poll set in order to
1935 * remove the channel(s)' fd just destroyed.
1936 */
1937 ret = notify_thread_pipe(wpipe);
1938 if (ret < 0) {
1939 PERROR("write kernel poll pipe");
1940 }
1941
1942 ret = session_destroy(session);
1943
1944 return ret;
1945 }
1946
1947 /*
1948 * Command LTTNG_CALIBRATE processed by the client thread.
1949 */
1950 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1951 {
1952 int ret;
1953
1954 switch (domain) {
1955 case LTTNG_DOMAIN_KERNEL:
1956 {
1957 struct lttng_kernel_calibrate kcalibrate;
1958
1959 kcalibrate.type = calibrate->type;
1960 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1961 if (ret < 0) {
1962 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1963 goto error;
1964 }
1965 break;
1966 }
1967 case LTTNG_DOMAIN_UST:
1968 {
1969 struct lttng_ust_calibrate ucalibrate;
1970
1971 ucalibrate.type = calibrate->type;
1972 ret = ust_app_calibrate_glb(&ucalibrate);
1973 if (ret < 0) {
1974 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1975 goto error;
1976 }
1977 break;
1978 }
1979 default:
1980 ret = LTTNG_ERR_UND;
1981 goto error;
1982 }
1983
1984 ret = LTTNG_OK;
1985
1986 error:
1987 return ret;
1988 }
1989
1990 /*
1991 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1992 */
1993 int cmd_register_consumer(struct ltt_session *session, int domain,
1994 const char *sock_path, struct consumer_data *cdata)
1995 {
1996 int ret, sock;
1997 struct consumer_socket *socket = NULL;
1998
1999 assert(session);
2000 assert(cdata);
2001 assert(sock_path);
2002
2003 switch (domain) {
2004 case LTTNG_DOMAIN_KERNEL:
2005 {
2006 struct ltt_kernel_session *ksess = session->kernel_session;
2007
2008 assert(ksess);
2009
2010 /* Can't register a consumer if there is already one */
2011 if (ksess->consumer_fds_sent != 0) {
2012 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2013 goto error;
2014 }
2015
2016 sock = lttcomm_connect_unix_sock(sock_path);
2017 if (sock < 0) {
2018 ret = LTTNG_ERR_CONNECT_FAIL;
2019 goto error;
2020 }
2021 cdata->cmd_sock = sock;
2022
2023 socket = consumer_allocate_socket(&cdata->cmd_sock);
2024 if (socket == NULL) {
2025 ret = close(sock);
2026 if (ret < 0) {
2027 PERROR("close register consumer");
2028 }
2029 cdata->cmd_sock = -1;
2030 ret = LTTNG_ERR_FATAL;
2031 goto error;
2032 }
2033
2034 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2035 if (socket->lock == NULL) {
2036 PERROR("zmalloc pthread mutex");
2037 ret = LTTNG_ERR_FATAL;
2038 goto error;
2039 }
2040 pthread_mutex_init(socket->lock, NULL);
2041 socket->registered = 1;
2042
2043 rcu_read_lock();
2044 consumer_add_socket(socket, ksess->consumer);
2045 rcu_read_unlock();
2046
2047 pthread_mutex_lock(&cdata->pid_mutex);
2048 cdata->pid = -1;
2049 pthread_mutex_unlock(&cdata->pid_mutex);
2050
2051 break;
2052 }
2053 default:
2054 /* TODO: Userspace tracing */
2055 ret = LTTNG_ERR_UND;
2056 goto error;
2057 }
2058
2059 return LTTNG_OK;
2060
2061 error:
2062 if (socket) {
2063 consumer_destroy_socket(socket);
2064 }
2065 return ret;
2066 }
2067
2068 /*
2069 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2070 */
2071 ssize_t cmd_list_domains(struct ltt_session *session,
2072 struct lttng_domain **domains)
2073 {
2074 int ret, index = 0;
2075 ssize_t nb_dom = 0;
2076
2077 if (session->kernel_session != NULL) {
2078 DBG3("Listing domains found kernel domain");
2079 nb_dom++;
2080 }
2081
2082 if (session->ust_session != NULL) {
2083 DBG3("Listing domains found UST global domain");
2084 nb_dom++;
2085 }
2086
2087 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2088 if (*domains == NULL) {
2089 ret = LTTNG_ERR_FATAL;
2090 goto error;
2091 }
2092
2093 if (session->kernel_session != NULL) {
2094 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2095 index++;
2096 }
2097
2098 if (session->ust_session != NULL) {
2099 (*domains)[index].type = LTTNG_DOMAIN_UST;
2100 (*domains)[index].buf_type = session->ust_session->buffer_type;
2101 index++;
2102 }
2103
2104 return nb_dom;
2105
2106 error:
2107 /* Return negative value to differentiate return code */
2108 return -ret;
2109 }
2110
2111
2112 /*
2113 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2114 */
2115 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2116 struct lttng_channel **channels)
2117 {
2118 int ret;
2119 ssize_t nb_chan = 0;
2120
2121 switch (domain) {
2122 case LTTNG_DOMAIN_KERNEL:
2123 if (session->kernel_session != NULL) {
2124 nb_chan = session->kernel_session->channel_count;
2125 }
2126 DBG3("Number of kernel channels %zd", nb_chan);
2127 if (nb_chan <= 0) {
2128 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2129 }
2130 break;
2131 case LTTNG_DOMAIN_UST:
2132 if (session->ust_session != NULL) {
2133 nb_chan = lttng_ht_get_count(
2134 session->ust_session->domain_global.channels);
2135 }
2136 DBG3("Number of UST global channels %zd", nb_chan);
2137 if (nb_chan <= 0) {
2138 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2139 }
2140 break;
2141 default:
2142 *channels = NULL;
2143 ret = LTTNG_ERR_UND;
2144 goto error;
2145 }
2146
2147 if (nb_chan > 0) {
2148 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2149 if (*channels == NULL) {
2150 ret = LTTNG_ERR_FATAL;
2151 goto error;
2152 }
2153
2154 list_lttng_channels(domain, session, *channels);
2155 } else {
2156 *channels = NULL;
2157 /* Ret value was set in the domain switch case */
2158 goto error;
2159 }
2160
2161 return nb_chan;
2162
2163 error:
2164 /* Return negative value to differentiate return code */
2165 return -ret;
2166 }
2167
2168 /*
2169 * Command LTTNG_LIST_EVENTS processed by the client thread.
2170 */
2171 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2172 char *channel_name, struct lttng_event **events)
2173 {
2174 int ret = 0;
2175 ssize_t nb_event = 0;
2176
2177 switch (domain) {
2178 case LTTNG_DOMAIN_KERNEL:
2179 if (session->kernel_session != NULL) {
2180 nb_event = list_lttng_kernel_events(channel_name,
2181 session->kernel_session, events);
2182 }
2183 break;
2184 case LTTNG_DOMAIN_UST:
2185 {
2186 if (session->ust_session != NULL) {
2187 nb_event = list_lttng_ust_global_events(channel_name,
2188 &session->ust_session->domain_global, events);
2189 }
2190 break;
2191 }
2192 default:
2193 ret = LTTNG_ERR_UND;
2194 goto error;
2195 }
2196
2197 return nb_event;
2198
2199 error:
2200 /* Return negative value to differentiate return code */
2201 return -ret;
2202 }
2203
2204 /*
2205 * Using the session list, filled a lttng_session array to send back to the
2206 * client for session listing.
2207 *
2208 * The session list lock MUST be acquired before calling this function. Use
2209 * session_lock_list() and session_unlock_list().
2210 */
2211 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2212 gid_t gid)
2213 {
2214 int ret;
2215 unsigned int i = 0;
2216 struct ltt_session *session;
2217 struct ltt_session_list *list = session_get_list();
2218
2219 DBG("Getting all available session for UID %d GID %d",
2220 uid, gid);
2221 /*
2222 * Iterate over session list and append data after the control struct in
2223 * the buffer.
2224 */
2225 cds_list_for_each_entry(session, &list->head, list) {
2226 /*
2227 * Only list the sessions the user can control.
2228 */
2229 if (!session_access_ok(session, uid, gid)) {
2230 continue;
2231 }
2232
2233 struct ltt_kernel_session *ksess = session->kernel_session;
2234 struct ltt_ust_session *usess = session->ust_session;
2235
2236 if (session->consumer->type == CONSUMER_DST_NET ||
2237 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2238 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2239 ret = build_network_session_path(sessions[i].path,
2240 sizeof(sessions[i].path), session);
2241 } else {
2242 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2243 session->consumer->dst.trace_path);
2244 }
2245 if (ret < 0) {
2246 PERROR("snprintf session path");
2247 continue;
2248 }
2249
2250 strncpy(sessions[i].name, session->name, NAME_MAX);
2251 sessions[i].name[NAME_MAX - 1] = '\0';
2252 sessions[i].enabled = session->enabled;
2253 sessions[i].snapshot_mode = session->snapshot_mode;
2254 i++;
2255 }
2256 }
2257
2258 /*
2259 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2260 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2261 */
2262 int cmd_data_pending(struct ltt_session *session)
2263 {
2264 int ret;
2265 struct ltt_kernel_session *ksess = session->kernel_session;
2266 struct ltt_ust_session *usess = session->ust_session;
2267
2268 assert(session);
2269
2270 /* Session MUST be stopped to ask for data availability. */
2271 if (session->enabled) {
2272 ret = LTTNG_ERR_SESSION_STARTED;
2273 goto error;
2274 }
2275
2276 if (ksess && ksess->consumer) {
2277 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2278 if (ret == 1) {
2279 /* Data is still being extracted for the kernel. */
2280 goto error;
2281 }
2282 }
2283
2284 if (usess && usess->consumer) {
2285 ret = consumer_is_data_pending(usess->id, usess->consumer);
2286 if (ret == 1) {
2287 /* Data is still being extracted for the kernel. */
2288 goto error;
2289 }
2290 }
2291
2292 /* Data is ready to be read by a viewer */
2293 ret = 0;
2294
2295 error:
2296 return ret;
2297 }
2298
2299 /*
2300 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2301 *
2302 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2303 */
2304 int cmd_snapshot_add_output(struct ltt_session *session,
2305 struct lttng_snapshot_output *output, uint32_t *id)
2306 {
2307 int ret;
2308 struct snapshot_output *new_output;
2309
2310 assert(session);
2311 assert(output);
2312
2313 DBG("Cmd snapshot add output for session %s", session->name);
2314
2315 /*
2316 * Permission denied to create an output if the session is not
2317 * set in no output mode.
2318 */
2319 if (session->output_traces) {
2320 ret = LTTNG_ERR_EPERM;
2321 goto error;
2322 }
2323
2324 /* Only one output is allowed until we have the "tee" feature. */
2325 if (session->snapshot.nb_output == 1) {
2326 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2327 goto error;
2328 }
2329
2330 new_output = snapshot_output_alloc();
2331 if (!new_output) {
2332 ret = LTTNG_ERR_NOMEM;
2333 goto error;
2334 }
2335
2336 ret = snapshot_output_init(output->max_size, output->name,
2337 output->ctrl_url, output->data_url, session->consumer, new_output,
2338 &session->snapshot);
2339 if (ret < 0) {
2340 if (ret == -ENOMEM) {
2341 ret = LTTNG_ERR_NOMEM;
2342 } else {
2343 ret = LTTNG_ERR_INVALID;
2344 }
2345 goto free_error;
2346 }
2347
2348 rcu_read_lock();
2349 snapshot_add_output(&session->snapshot, new_output);
2350 if (id) {
2351 *id = new_output->id;
2352 }
2353 rcu_read_unlock();
2354
2355 return LTTNG_OK;
2356
2357 free_error:
2358 snapshot_output_destroy(new_output);
2359 error:
2360 return ret;
2361 }
2362
2363 /*
2364 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2365 *
2366 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2367 */
2368 int cmd_snapshot_del_output(struct ltt_session *session,
2369 struct lttng_snapshot_output *output)
2370 {
2371 int ret;
2372 struct snapshot_output *sout = NULL;
2373
2374 assert(session);
2375 assert(output);
2376
2377 rcu_read_lock();
2378
2379 /*
2380 * Permission denied to create an output if the session is not
2381 * set in no output mode.
2382 */
2383 if (session->output_traces) {
2384 ret = LTTNG_ERR_EPERM;
2385 goto error;
2386 }
2387
2388 if (output->id) {
2389 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2390 session->name);
2391 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2392 } else if (*output->name != '\0') {
2393 DBG("Cmd snapshot del output name %s for session %s", output->name,
2394 session->name);
2395 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2396 }
2397 if (!sout) {
2398 ret = LTTNG_ERR_INVALID;
2399 goto error;
2400 }
2401
2402 snapshot_delete_output(&session->snapshot, sout);
2403 snapshot_output_destroy(sout);
2404 ret = LTTNG_OK;
2405
2406 error:
2407 rcu_read_unlock();
2408 return ret;
2409 }
2410
2411 /*
2412 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2413 *
2414 * If no output is available, outputs is untouched and 0 is returned.
2415 *
2416 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2417 */
2418 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2419 struct lttng_snapshot_output **outputs)
2420 {
2421 int ret, idx = 0;
2422 struct lttng_snapshot_output *list;
2423 struct lttng_ht_iter iter;
2424 struct snapshot_output *output;
2425
2426 assert(session);
2427 assert(outputs);
2428
2429 DBG("Cmd snapshot list outputs for session %s", session->name);
2430
2431 /*
2432 * Permission denied to create an output if the session is not
2433 * set in no output mode.
2434 */
2435 if (session->output_traces) {
2436 ret = LTTNG_ERR_EPERM;
2437 goto error;
2438 }
2439
2440 if (session->snapshot.nb_output == 0) {
2441 ret = 0;
2442 goto error;
2443 }
2444
2445 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2446 if (!list) {
2447 ret = LTTNG_ERR_NOMEM;
2448 goto error;
2449 }
2450
2451 /* Copy list from session to the new list object. */
2452 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2453 output, node.node) {
2454 assert(output->consumer);
2455 list[idx].id = output->id;
2456 list[idx].max_size = output->max_size;
2457 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2458 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2459 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2460 sizeof(list[idx].ctrl_url));
2461 } else {
2462 /* Control URI. */
2463 ret = uri_to_str_url(&output->consumer->dst.net.control,
2464 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2465 if (ret < 0) {
2466 ret = LTTNG_ERR_NOMEM;
2467 goto free_error;
2468 }
2469
2470 /* Data URI. */
2471 ret = uri_to_str_url(&output->consumer->dst.net.data,
2472 list[idx].data_url, sizeof(list[idx].data_url));
2473 if (ret < 0) {
2474 ret = LTTNG_ERR_NOMEM;
2475 goto free_error;
2476 }
2477 }
2478 idx++;
2479 }
2480
2481 *outputs = list;
2482 return session->snapshot.nb_output;
2483
2484 free_error:
2485 free(list);
2486 error:
2487 return -ret;
2488 }
2489
2490 /*
2491 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2492 * snapshot output is *not* set with a remote destination.
2493 *
2494 * Return 0 on success or a LTTNG_ERR code.
2495 */
2496 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2497 struct snapshot_output *snap_output, struct ltt_session *session)
2498 {
2499 int ret = LTTNG_OK;
2500 struct lttng_ht_iter iter;
2501 struct consumer_socket *socket;
2502
2503 assert(consumer);
2504 assert(snap_output);
2505 assert(session);
2506
2507 DBG2("Set relayd object from snapshot output");
2508
2509 /* Ignore if snapshot consumer output is not network. */
2510 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2511 goto error;
2512 }
2513
2514 /*
2515 * For each consumer socket, create and send the relayd object of the
2516 * snapshot output.
2517 */
2518 rcu_read_lock();
2519 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2520 socket, node.node) {
2521 ret = send_consumer_relayd_sockets(0, session->id,
2522 snap_output->consumer, socket);
2523 if (ret != LTTNG_OK) {
2524 rcu_read_unlock();
2525 goto error;
2526 }
2527 }
2528 rcu_read_unlock();
2529
2530 error:
2531 return ret;
2532 }
2533
2534 /*
2535 * Record a kernel snapshot.
2536 *
2537 * Return 0 on success or a LTTNG_ERR code.
2538 */
2539 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2540 struct snapshot_output *output, struct ltt_session *session,
2541 int wait, int nb_streams)
2542 {
2543 int ret;
2544
2545 assert(ksess);
2546 assert(output);
2547 assert(session);
2548
2549 /* Get the datetime for the snapshot output directory. */
2550 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2551 sizeof(output->datetime));
2552 if (!ret) {
2553 ret = LTTNG_ERR_INVALID;
2554 goto error;
2555 }
2556
2557 /*
2558 * Copy kernel session sockets so we can communicate with the right
2559 * consumer for the snapshot record command.
2560 */
2561 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2562 if (ret < 0) {
2563 ret = LTTNG_ERR_NOMEM;
2564 goto error;
2565 }
2566
2567 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2568 if (ret != LTTNG_OK) {
2569 goto error_snapshot;
2570 }
2571
2572 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2573 if (ret != LTTNG_OK) {
2574 goto error_snapshot;
2575 }
2576
2577 ret = LTTNG_OK;
2578
2579 error_snapshot:
2580 /* Clean up copied sockets so this output can use some other later on. */
2581 consumer_destroy_output_sockets(output->consumer);
2582 error:
2583 return ret;
2584 }
2585
2586 /*
2587 * Record a UST snapshot.
2588 *
2589 * Return 0 on success or a LTTNG_ERR error code.
2590 */
2591 static int record_ust_snapshot(struct ltt_ust_session *usess,
2592 struct snapshot_output *output, struct ltt_session *session,
2593 int wait, int nb_streams)
2594 {
2595 int ret;
2596
2597 assert(usess);
2598 assert(output);
2599 assert(session);
2600
2601 /* Get the datetime for the snapshot output directory. */
2602 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2603 sizeof(output->datetime));
2604 if (!ret) {
2605 ret = LTTNG_ERR_INVALID;
2606 goto error;
2607 }
2608
2609 /*
2610 * Copy UST session sockets so we can communicate with the right
2611 * consumer for the snapshot record command.
2612 */
2613 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2614 if (ret < 0) {
2615 ret = LTTNG_ERR_NOMEM;
2616 goto error;
2617 }
2618
2619 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2620 if (ret != LTTNG_OK) {
2621 goto error_snapshot;
2622 }
2623
2624 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2625 if (ret < 0) {
2626 if (ret == -EINVAL) {
2627 ret = LTTNG_ERR_INVALID;
2628 goto error_snapshot;
2629 }
2630
2631 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2632 goto error_snapshot;
2633 }
2634
2635 ret = LTTNG_OK;
2636
2637 error_snapshot:
2638 /* Clean up copied sockets so this output can use some other later on. */
2639 consumer_destroy_output_sockets(output->consumer);
2640 error:
2641 return ret;
2642 }
2643
2644 /*
2645 * Returns the total number of streams for a session or a negative value
2646 * on error.
2647 */
2648 static unsigned int get_total_nb_stream(struct ltt_session *session)
2649 {
2650 unsigned int total_streams = 0;
2651
2652 if (session->kernel_session) {
2653 struct ltt_kernel_session *ksess = session->kernel_session;
2654
2655 total_streams += ksess->stream_count_global;
2656 }
2657
2658 if (session->ust_session) {
2659 struct ltt_ust_session *usess = session->ust_session;
2660
2661 total_streams += ust_app_get_nb_stream(usess);
2662 }
2663
2664 return total_streams;
2665 }
2666
2667 /*
2668 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2669 *
2670 * The wait parameter is ignored so this call always wait for the snapshot to
2671 * complete before returning.
2672 *
2673 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2674 */
2675 int cmd_snapshot_record(struct ltt_session *session,
2676 struct lttng_snapshot_output *output, int wait)
2677 {
2678 int ret = LTTNG_OK;
2679 unsigned int use_tmp_output = 0;
2680 struct snapshot_output tmp_output;
2681 unsigned int nb_streams, snapshot_success = 0;
2682
2683 assert(session);
2684
2685 DBG("Cmd snapshot record for session %s", session->name);
2686
2687 /*
2688 * Permission denied to create an output if the session is not
2689 * set in no output mode.
2690 */
2691 if (session->output_traces) {
2692 ret = LTTNG_ERR_EPERM;
2693 goto error;
2694 }
2695
2696 /* The session needs to be started at least once. */
2697 if (!session->started) {
2698 ret = LTTNG_ERR_START_SESSION_ONCE;
2699 goto error;
2700 }
2701
2702 /* Use temporary output for the session. */
2703 if (output && *output->ctrl_url != '\0') {
2704 ret = snapshot_output_init(output->max_size, output->name,
2705 output->ctrl_url, output->data_url, session->consumer,
2706 &tmp_output, NULL);
2707 if (ret < 0) {
2708 if (ret == -ENOMEM) {
2709 ret = LTTNG_ERR_NOMEM;
2710 } else {
2711 ret = LTTNG_ERR_INVALID;
2712 }
2713 goto error;
2714 }
2715 /* Use the global session count for the temporary snapshot. */
2716 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2717 use_tmp_output = 1;
2718 }
2719
2720 /*
2721 * Get the total number of stream of that session which is used by the
2722 * maximum size of the snapshot feature.
2723 */
2724 nb_streams = get_total_nb_stream(session);
2725
2726 if (session->kernel_session) {
2727 struct ltt_kernel_session *ksess = session->kernel_session;
2728
2729 if (use_tmp_output) {
2730 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2731 wait, nb_streams);
2732 if (ret != LTTNG_OK) {
2733 goto error;
2734 }
2735 snapshot_success = 1;
2736 } else {
2737 struct snapshot_output *sout;
2738 struct lttng_ht_iter iter;
2739
2740 rcu_read_lock();
2741 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2742 &iter.iter, sout, node.node) {
2743 /*
2744 * Make a local copy of the output and assign the possible
2745 * temporary value given by the caller.
2746 */
2747 memset(&tmp_output, 0, sizeof(tmp_output));
2748 memcpy(&tmp_output, sout, sizeof(tmp_output));
2749
2750 /* Use temporary max size. */
2751 if (output->max_size != (uint64_t) -1ULL) {
2752 tmp_output.max_size = output->max_size;
2753 }
2754
2755 /* Use temporary name. */
2756 if (*output->name != '\0') {
2757 strncpy(tmp_output.name, output->name,
2758 sizeof(tmp_output.name));
2759 }
2760
2761 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2762
2763 ret = record_kernel_snapshot(ksess, &tmp_output,
2764 session, wait, nb_streams);
2765 if (ret != LTTNG_OK) {
2766 rcu_read_unlock();
2767 goto error;
2768 }
2769 snapshot_success = 1;
2770 }
2771 rcu_read_unlock();
2772 }
2773 }
2774
2775 if (session->ust_session) {
2776 struct ltt_ust_session *usess = session->ust_session;
2777
2778 if (use_tmp_output) {
2779 ret = record_ust_snapshot(usess, &tmp_output, session,
2780 wait, nb_streams);
2781 if (ret != LTTNG_OK) {
2782 goto error;
2783 }
2784 snapshot_success = 1;
2785 } else {
2786 struct snapshot_output *sout;
2787 struct lttng_ht_iter iter;
2788
2789 rcu_read_lock();
2790 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2791 &iter.iter, sout, node.node) {
2792 /*
2793 * Make a local copy of the output and assign the possible
2794 * temporary value given by the caller.
2795 */
2796 memset(&tmp_output, 0, sizeof(tmp_output));
2797 memcpy(&tmp_output, sout, sizeof(tmp_output));
2798
2799 /* Use temporary max size. */
2800 if (output->max_size != (uint64_t) -1ULL) {
2801 tmp_output.max_size = output->max_size;
2802 }
2803
2804 /* Use temporary name. */
2805 if (*output->name != '\0') {
2806 strncpy(tmp_output.name, output->name,
2807 sizeof(tmp_output.name));
2808 }
2809
2810 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2811
2812 ret = record_ust_snapshot(usess, &tmp_output, session,
2813 wait, nb_streams);
2814 if (ret != LTTNG_OK) {
2815 rcu_read_unlock();
2816 goto error;
2817 }
2818 snapshot_success = 1;
2819 }
2820 rcu_read_unlock();
2821 }
2822 }
2823
2824 if (snapshot_success) {
2825 session->snapshot.nb_snapshot++;
2826 } else {
2827 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2828 }
2829
2830 error:
2831 return ret;
2832 }
2833
2834 /*
2835 * Init command subsystem.
2836 */
2837 void cmd_init(void)
2838 {
2839 /*
2840 * Set network sequence index to 1 for streams to match a relayd
2841 * socket on the consumer side.
2842 */
2843 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2844 relayd_net_seq_idx = 1;
2845 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2846
2847 DBG("Command subsystem initialized");
2848 }
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