projects / lttng-tools.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Cleanup: add missing dot
[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 /*
863 * Don't try to enable a channel if the session has been started at
864 * some point in time before. The tracer does not allow it.
865 */
866 if (session->started) {
867 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
868 goto error;
869 }
870
871 switch (domain->type) {
872 case LTTNG_DOMAIN_KERNEL:
873 {
874 struct ltt_kernel_channel *kchan;
875
876 kchan = trace_kernel_get_channel_by_name(attr->name,
877 session->kernel_session);
878 if (kchan == NULL) {
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 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 /*
1119 * If a non-default channel has been created in the
1120 * session, explicitely require that -c chan_name needs
1121 * to be provided.
1122 */
1123 if (session->kernel_session->has_non_default_channel
1124 && channel_name[0] == '\0') {
1125 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1126 goto error;
1127 }
1128
1129 if (session->kernel_session->channel_count == 0) {
1130 /* Create default channel */
1131 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1132 if (ret != LTTNG_OK) {
1133 goto error;
1134 }
1135 chan_kern_created = 1;
1136 }
1137 /* Add kernel context to kernel tracer */
1138 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1139 if (ret != LTTNG_OK) {
1140 goto error;
1141 }
1142 break;
1143 case LTTNG_DOMAIN_UST:
1144 {
1145 struct ltt_ust_session *usess = session->ust_session;
1146 unsigned int chan_count;
1147
1148 assert(usess);
1149
1150 /*
1151 * If a non-default channel has been created in the
1152 * session, explicitely require that -c chan_name needs
1153 * to be provided.
1154 */
1155 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1156 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1157 goto error;
1158 }
1159
1160 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1161 if (chan_count == 0) {
1162 struct lttng_channel *attr;
1163 /* Create default channel */
1164 attr = channel_new_default_attr(domain, usess->buffer_type);
1165 if (attr == NULL) {
1166 ret = LTTNG_ERR_FATAL;
1167 goto error;
1168 }
1169
1170 ret = channel_ust_create(usess, attr, usess->buffer_type);
1171 if (ret != LTTNG_OK) {
1172 free(attr);
1173 goto error;
1174 }
1175 free(attr);
1176 chan_ust_created = 1;
1177 }
1178
1179 ret = context_ust_add(usess, domain, ctx, channel_name);
1180 if (ret != LTTNG_OK) {
1181 goto error;
1182 }
1183 break;
1184 }
1185 #if 0
1186 case LTTNG_DOMAIN_UST_EXEC_NAME:
1187 case LTTNG_DOMAIN_UST_PID:
1188 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1189 #endif
1190 default:
1191 ret = LTTNG_ERR_UND;
1192 goto error;
1193 }
1194
1195 return LTTNG_OK;
1196
1197 error:
1198 if (chan_kern_created) {
1199 struct ltt_kernel_channel *kchan =
1200 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1201 session->kernel_session);
1202 /* Created previously, this should NOT fail. */
1203 assert(kchan);
1204 kernel_destroy_channel(kchan);
1205 }
1206
1207 if (chan_ust_created) {
1208 struct ltt_ust_channel *uchan =
1209 trace_ust_find_channel_by_name(
1210 session->ust_session->domain_global.channels,
1211 DEFAULT_CHANNEL_NAME);
1212 /* Created previously, this should NOT fail. */
1213 assert(uchan);
1214 /* Remove from the channel list of the session. */
1215 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1216 uchan);
1217 trace_ust_destroy_channel(uchan);
1218 }
1219 return ret;
1220 }
1221
1222 /*
1223 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1224 */
1225 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1226 char *channel_name, struct lttng_event *event,
1227 struct lttng_filter_bytecode *filter, int wpipe)
1228 {
1229 int ret, channel_created = 0;
1230 struct lttng_channel *attr;
1231
1232 assert(session);
1233 assert(event);
1234 assert(channel_name);
1235
1236 rcu_read_lock();
1237
1238 switch (domain->type) {
1239 case LTTNG_DOMAIN_KERNEL:
1240 {
1241 struct ltt_kernel_channel *kchan;
1242
1243 /*
1244 * If a non-default channel has been created in the
1245 * session, explicitely require that -c chan_name needs
1246 * to be provided.
1247 */
1248 if (session->kernel_session->has_non_default_channel
1249 && channel_name[0] == '\0') {
1250 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1251 goto error;
1252 }
1253
1254 kchan = trace_kernel_get_channel_by_name(channel_name,
1255 session->kernel_session);
1256 if (kchan == NULL) {
1257 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1258 LTTNG_BUFFER_GLOBAL);
1259 if (attr == NULL) {
1260 ret = LTTNG_ERR_FATAL;
1261 goto error;
1262 }
1263 strncpy(attr->name, channel_name, sizeof(attr->name));
1264
1265 ret = cmd_enable_channel(session, domain, attr, wpipe);
1266 if (ret != LTTNG_OK) {
1267 free(attr);
1268 goto error;
1269 }
1270 free(attr);
1271
1272 channel_created = 1;
1273 }
1274
1275 /* Get the newly created kernel channel pointer */
1276 kchan = trace_kernel_get_channel_by_name(channel_name,
1277 session->kernel_session);
1278 if (kchan == NULL) {
1279 /* This sould not happen... */
1280 ret = LTTNG_ERR_FATAL;
1281 goto error;
1282 }
1283
1284 ret = event_kernel_enable_tracepoint(kchan, event);
1285 if (ret != LTTNG_OK) {
1286 if (channel_created) {
1287 /* Let's not leak a useless channel. */
1288 kernel_destroy_channel(kchan);
1289 }
1290 goto error;
1291 }
1292
1293 kernel_wait_quiescent(kernel_tracer_fd);
1294 break;
1295 }
1296 case LTTNG_DOMAIN_UST:
1297 {
1298 struct ltt_ust_channel *uchan;
1299 struct ltt_ust_session *usess = session->ust_session;
1300
1301 assert(usess);
1302
1303 /*
1304 * If a non-default channel has been created in the
1305 * session, explicitely require that -c chan_name needs
1306 * to be provided.
1307 */
1308 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1309 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1310 goto error;
1311 }
1312
1313 /* Get channel from global UST domain */
1314 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1315 channel_name);
1316 if (uchan == NULL) {
1317 /* Create default channel */
1318 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1319 usess->buffer_type);
1320 if (attr == NULL) {
1321 ret = LTTNG_ERR_FATAL;
1322 goto error;
1323 }
1324 strncpy(attr->name, channel_name, sizeof(attr->name));
1325
1326 ret = cmd_enable_channel(session, domain, attr, wpipe);
1327 if (ret != LTTNG_OK) {
1328 free(attr);
1329 goto error;
1330 }
1331 free(attr);
1332
1333 /* Get the newly created channel reference back */
1334 uchan = trace_ust_find_channel_by_name(
1335 usess->domain_global.channels, channel_name);
1336 assert(uchan);
1337 }
1338
1339 /* At this point, the session and channel exist on the tracer */
1340 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1341 if (ret != LTTNG_OK) {
1342 goto error;
1343 }
1344 break;
1345 }
1346 #if 0
1347 case LTTNG_DOMAIN_UST_EXEC_NAME:
1348 case LTTNG_DOMAIN_UST_PID:
1349 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1350 #endif
1351 default:
1352 ret = LTTNG_ERR_UND;
1353 goto error;
1354 }
1355
1356 ret = LTTNG_OK;
1357
1358 error:
1359 rcu_read_unlock();
1360 return ret;
1361 }
1362
1363 /*
1364 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1365 */
1366 int cmd_enable_event_all(struct ltt_session *session,
1367 struct lttng_domain *domain, char *channel_name, int event_type,
1368 struct lttng_filter_bytecode *filter, int wpipe)
1369 {
1370 int ret;
1371 struct lttng_channel *attr;
1372
1373 assert(session);
1374 assert(channel_name);
1375
1376 rcu_read_lock();
1377
1378 switch (domain->type) {
1379 case LTTNG_DOMAIN_KERNEL:
1380 {
1381 struct ltt_kernel_channel *kchan;
1382
1383 assert(session->kernel_session);
1384
1385 /*
1386 * If a non-default channel has been created in the
1387 * session, explicitely require that -c chan_name needs
1388 * to be provided.
1389 */
1390 if (session->kernel_session->has_non_default_channel
1391 && channel_name[0] == '\0') {
1392 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1393 goto error;
1394 }
1395
1396 kchan = trace_kernel_get_channel_by_name(channel_name,
1397 session->kernel_session);
1398 if (kchan == NULL) {
1399 /* Create default channel */
1400 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1401 LTTNG_BUFFER_GLOBAL);
1402 if (attr == NULL) {
1403 ret = LTTNG_ERR_FATAL;
1404 goto error;
1405 }
1406 strncpy(attr->name, channel_name, sizeof(attr->name));
1407
1408 ret = cmd_enable_channel(session, domain, attr, wpipe);
1409 if (ret != LTTNG_OK) {
1410 free(attr);
1411 goto error;
1412 }
1413 free(attr);
1414
1415 /* Get the newly created kernel channel pointer */
1416 kchan = trace_kernel_get_channel_by_name(channel_name,
1417 session->kernel_session);
1418 assert(kchan);
1419 }
1420
1421 switch (event_type) {
1422 case LTTNG_EVENT_SYSCALL:
1423 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1424 break;
1425 case LTTNG_EVENT_TRACEPOINT:
1426 /*
1427 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1428 * events already registered to the channel.
1429 */
1430 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1431 break;
1432 case LTTNG_EVENT_ALL:
1433 /* Enable syscalls and tracepoints */
1434 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1435 break;
1436 default:
1437 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1438 goto error;
1439 }
1440
1441 /* Manage return value */
1442 if (ret != LTTNG_OK) {
1443 /*
1444 * On error, cmd_enable_channel call will take care of destroying
1445 * the created channel if it was needed.
1446 */
1447 goto error;
1448 }
1449
1450 kernel_wait_quiescent(kernel_tracer_fd);
1451 break;
1452 }
1453 case LTTNG_DOMAIN_UST:
1454 {
1455 struct ltt_ust_channel *uchan;
1456 struct ltt_ust_session *usess = session->ust_session;
1457
1458 assert(usess);
1459
1460 /*
1461 * If a non-default channel has been created in the
1462 * session, explicitely require that -c chan_name needs
1463 * to be provided.
1464 */
1465 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1466 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1467 goto error;
1468 }
1469
1470 /* Get channel from global UST domain */
1471 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1472 channel_name);
1473 if (uchan == NULL) {
1474 /* Create default channel */
1475 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1476 usess->buffer_type);
1477 if (attr == NULL) {
1478 ret = LTTNG_ERR_FATAL;
1479 goto error;
1480 }
1481 strncpy(attr->name, channel_name, sizeof(attr->name));
1482
1483 ret = cmd_enable_channel(session, domain, attr, wpipe);
1484 if (ret != LTTNG_OK) {
1485 free(attr);
1486 goto error;
1487 }
1488 free(attr);
1489
1490 /* Get the newly created channel reference back */
1491 uchan = trace_ust_find_channel_by_name(
1492 usess->domain_global.channels, channel_name);
1493 assert(uchan);
1494 }
1495
1496 /* At this point, the session and channel exist on the tracer */
1497
1498 switch (event_type) {
1499 case LTTNG_EVENT_ALL:
1500 case LTTNG_EVENT_TRACEPOINT:
1501 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1502 if (ret != LTTNG_OK) {
1503 goto error;
1504 }
1505 break;
1506 default:
1507 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1508 goto error;
1509 }
1510
1511 /* Manage return value */
1512 if (ret != LTTNG_OK) {
1513 goto error;
1514 }
1515
1516 break;
1517 }
1518 #if 0
1519 case LTTNG_DOMAIN_UST_EXEC_NAME:
1520 case LTTNG_DOMAIN_UST_PID:
1521 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1522 #endif
1523 default:
1524 ret = LTTNG_ERR_UND;
1525 goto error;
1526 }
1527
1528 ret = LTTNG_OK;
1529
1530 error:
1531 rcu_read_unlock();
1532 return ret;
1533 }
1534
1535
1536 /*
1537 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1538 */
1539 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1540 {
1541 int ret;
1542 ssize_t nb_events = 0;
1543
1544 switch (domain) {
1545 case LTTNG_DOMAIN_KERNEL:
1546 nb_events = kernel_list_events(kernel_tracer_fd, events);
1547 if (nb_events < 0) {
1548 ret = LTTNG_ERR_KERN_LIST_FAIL;
1549 goto error;
1550 }
1551 break;
1552 case LTTNG_DOMAIN_UST:
1553 nb_events = ust_app_list_events(events);
1554 if (nb_events < 0) {
1555 ret = LTTNG_ERR_UST_LIST_FAIL;
1556 goto error;
1557 }
1558 break;
1559 default:
1560 ret = LTTNG_ERR_UND;
1561 goto error;
1562 }
1563
1564 return nb_events;
1565
1566 error:
1567 /* Return negative value to differentiate return code */
1568 return -ret;
1569 }
1570
1571 /*
1572 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1573 */
1574 ssize_t cmd_list_tracepoint_fields(int domain,
1575 struct lttng_event_field **fields)
1576 {
1577 int ret;
1578 ssize_t nb_fields = 0;
1579
1580 switch (domain) {
1581 case LTTNG_DOMAIN_UST:
1582 nb_fields = ust_app_list_event_fields(fields);
1583 if (nb_fields < 0) {
1584 ret = LTTNG_ERR_UST_LIST_FAIL;
1585 goto error;
1586 }
1587 break;
1588 case LTTNG_DOMAIN_KERNEL:
1589 default: /* fall-through */
1590 ret = LTTNG_ERR_UND;
1591 goto error;
1592 }
1593
1594 return nb_fields;
1595
1596 error:
1597 /* Return negative value to differentiate return code */
1598 return -ret;
1599 }
1600
1601 /*
1602 * Command LTTNG_START_TRACE processed by the client thread.
1603 */
1604 int cmd_start_trace(struct ltt_session *session)
1605 {
1606 int ret;
1607 struct ltt_kernel_session *ksession;
1608 struct ltt_ust_session *usess;
1609
1610 assert(session);
1611
1612 /* Ease our life a bit ;) */
1613 ksession = session->kernel_session;
1614 usess = session->ust_session;
1615
1616 if (session->enabled) {
1617 /* Already started. */
1618 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1619 goto error;
1620 }
1621
1622 session->enabled = 1;
1623
1624 /* Kernel tracing */
1625 if (ksession != NULL) {
1626 ret = start_kernel_session(ksession, kernel_tracer_fd);
1627 if (ret != LTTNG_OK) {
1628 goto error;
1629 }
1630 }
1631
1632 /* Flag session that trace should start automatically */
1633 if (usess) {
1634 usess->start_trace = 1;
1635
1636 ret = ust_app_start_trace_all(usess);
1637 if (ret < 0) {
1638 ret = LTTNG_ERR_UST_START_FAIL;
1639 goto error;
1640 }
1641 }
1642
1643 session->started = 1;
1644
1645 ret = LTTNG_OK;
1646
1647 error:
1648 return ret;
1649 }
1650
1651 /*
1652 * Command LTTNG_STOP_TRACE processed by the client thread.
1653 */
1654 int cmd_stop_trace(struct ltt_session *session)
1655 {
1656 int ret;
1657 struct ltt_kernel_channel *kchan;
1658 struct ltt_kernel_session *ksession;
1659 struct ltt_ust_session *usess;
1660
1661 assert(session);
1662
1663 /* Short cut */
1664 ksession = session->kernel_session;
1665 usess = session->ust_session;
1666
1667 if (!session->enabled) {
1668 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1669 goto error;
1670 }
1671
1672 session->enabled = 0;
1673
1674 /* Kernel tracer */
1675 if (ksession && ksession->started) {
1676 DBG("Stop kernel tracing");
1677
1678 /* Flush metadata if exist */
1679 if (ksession->metadata_stream_fd >= 0) {
1680 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1681 if (ret < 0) {
1682 ERR("Kernel metadata flush failed");
1683 }
1684 }
1685
1686 /* Flush all buffers before stopping */
1687 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1688 ret = kernel_flush_buffer(kchan);
1689 if (ret < 0) {
1690 ERR("Kernel flush buffer error");
1691 }
1692 }
1693
1694 ret = kernel_stop_session(ksession);
1695 if (ret < 0) {
1696 ret = LTTNG_ERR_KERN_STOP_FAIL;
1697 goto error;
1698 }
1699
1700 kernel_wait_quiescent(kernel_tracer_fd);
1701
1702 ksession->started = 0;
1703 }
1704
1705 if (usess && usess->start_trace) {
1706 usess->start_trace = 0;
1707
1708 ret = ust_app_stop_trace_all(usess);
1709 if (ret < 0) {
1710 ret = LTTNG_ERR_UST_STOP_FAIL;
1711 goto error;
1712 }
1713 }
1714
1715 ret = LTTNG_OK;
1716
1717 error:
1718 return ret;
1719 }
1720
1721 /*
1722 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1723 */
1724 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1725 size_t nb_uri, struct lttng_uri *uris)
1726 {
1727 int ret, i;
1728 struct ltt_kernel_session *ksess = session->kernel_session;
1729 struct ltt_ust_session *usess = session->ust_session;
1730 struct consumer_output *consumer = NULL;
1731
1732 assert(session);
1733 assert(uris);
1734 assert(nb_uri > 0);
1735
1736 /* Can't enable consumer after session started. */
1737 if (session->enabled) {
1738 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1739 goto error;
1740 }
1741
1742 /*
1743 * This case switch makes sure the domain session has a temporary consumer
1744 * so the URL can be set.
1745 */
1746 switch (domain) {
1747 case 0:
1748 /* Code flow error. A session MUST always have a consumer object */
1749 assert(session->consumer);
1750 /*
1751 * The URL will be added to the tracing session consumer instead of a
1752 * specific domain consumer.
1753 */
1754 consumer = session->consumer;
1755 break;
1756 case LTTNG_DOMAIN_KERNEL:
1757 /* Code flow error if we don't have a kernel session here. */
1758 assert(ksess);
1759 assert(ksess->consumer);
1760 consumer = ksess->consumer;
1761 break;
1762 case LTTNG_DOMAIN_UST:
1763 /* Code flow error if we don't have a kernel session here. */
1764 assert(usess);
1765 assert(usess->consumer);
1766 consumer = usess->consumer;
1767 break;
1768 }
1769
1770 for (i = 0; i < nb_uri; i++) {
1771 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1772 if (ret != LTTNG_OK) {
1773 goto error;
1774 }
1775 }
1776
1777 /* All good! */
1778 ret = LTTNG_OK;
1779
1780 error:
1781 return ret;
1782 }
1783
1784 /*
1785 * Command LTTNG_CREATE_SESSION processed by the client thread.
1786 */
1787 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1788 size_t nb_uri, lttng_sock_cred *creds)
1789 {
1790 int ret;
1791 struct ltt_session *session;
1792
1793 assert(name);
1794 assert(creds);
1795
1796 /*
1797 * Verify if the session already exist
1798 *
1799 * XXX: There is no need for the session lock list here since the caller
1800 * (process_client_msg) is holding it. We might want to change that so a
1801 * single command does not lock the entire session list.
1802 */
1803 session = session_find_by_name(name);
1804 if (session != NULL) {
1805 ret = LTTNG_ERR_EXIST_SESS;
1806 goto find_error;
1807 }
1808
1809 /* Create tracing session in the registry */
1810 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1811 LTTNG_SOCK_GET_GID_CRED(creds));
1812 if (ret != LTTNG_OK) {
1813 goto session_error;
1814 }
1815
1816 /*
1817 * Get the newly created session pointer back
1818 *
1819 * XXX: There is no need for the session lock list here since the caller
1820 * (process_client_msg) is holding it. We might want to change that so a
1821 * single command does not lock the entire session list.
1822 */
1823 session = session_find_by_name(name);
1824 assert(session);
1825
1826 /* Create default consumer output for the session not yet created. */
1827 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1828 if (session->consumer == NULL) {
1829 ret = LTTNG_ERR_FATAL;
1830 goto consumer_error;
1831 }
1832
1833 if (uris) {
1834 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1835 if (ret != LTTNG_OK) {
1836 goto consumer_error;
1837 }
1838 session->output_traces = 1;
1839 } else {
1840 session->output_traces = 0;
1841 DBG2("Session %s created with no output", session->name);
1842 }
1843
1844 session->consumer->enabled = 1;
1845
1846 return LTTNG_OK;
1847
1848 consumer_error:
1849 session_destroy(session);
1850 session_error:
1851 find_error:
1852 return ret;
1853 }
1854
1855 /*
1856 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1857 */
1858 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
1859 size_t nb_uri, lttng_sock_cred *creds)
1860 {
1861 int ret;
1862 struct ltt_session *session;
1863 struct snapshot_output *new_output = NULL;
1864
1865 assert(name);
1866 assert(creds);
1867
1868 /*
1869 * Create session in no output mode with URIs set to NULL. The uris we've
1870 * received are for a default snapshot output if one.
1871 */
1872 ret = cmd_create_session_uri(name, NULL, 0, creds);
1873 if (ret != LTTNG_OK) {
1874 goto error;
1875 }
1876
1877 /* Get the newly created session pointer back. This should NEVER fail. */
1878 session = session_find_by_name(name);
1879 assert(session);
1880
1881 /* Flag session for snapshot mode. */
1882 session->snapshot_mode = 1;
1883
1884 /* Skip snapshot output creation if no URI is given. */
1885 if (nb_uri == 0) {
1886 goto end;
1887 }
1888
1889 new_output = snapshot_output_alloc();
1890 if (!new_output) {
1891 ret = LTTNG_ERR_NOMEM;
1892 goto error_snapshot_alloc;
1893 }
1894
1895 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
1896 uris, nb_uri, session->consumer, new_output, &session->snapshot);
1897 if (ret < 0) {
1898 if (ret == -ENOMEM) {
1899 ret = LTTNG_ERR_NOMEM;
1900 } else {
1901 ret = LTTNG_ERR_INVALID;
1902 }
1903 goto error_snapshot;
1904 }
1905
1906 rcu_read_lock();
1907 snapshot_add_output(&session->snapshot, new_output);
1908 rcu_read_unlock();
1909
1910 end:
1911 return LTTNG_OK;
1912
1913 error_snapshot:
1914 snapshot_output_destroy(new_output);
1915 error_snapshot_alloc:
1916 session_destroy(session);
1917 error:
1918 return ret;
1919 }
1920
1921 /*
1922 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1923 */
1924 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1925 {
1926 int ret;
1927 struct ltt_ust_session *usess;
1928 struct ltt_kernel_session *ksess;
1929
1930 /* Safety net */
1931 assert(session);
1932
1933 usess = session->ust_session;
1934 ksess = session->kernel_session;
1935
1936 /* Clean kernel session teardown */
1937 kernel_destroy_session(ksess);
1938
1939 /* UST session teardown */
1940 if (usess) {
1941 /* Close any relayd session */
1942 consumer_output_send_destroy_relayd(usess->consumer);
1943
1944 /* Destroy every UST application related to this session. */
1945 ret = ust_app_destroy_trace_all(usess);
1946 if (ret) {
1947 ERR("Error in ust_app_destroy_trace_all");
1948 }
1949
1950 /* Clean up the rest. */
1951 trace_ust_destroy_session(usess);
1952 }
1953
1954 /*
1955 * Must notify the kernel thread here to update it's poll set in order to
1956 * remove the channel(s)' fd just destroyed.
1957 */
1958 ret = notify_thread_pipe(wpipe);
1959 if (ret < 0) {
1960 PERROR("write kernel poll pipe");
1961 }
1962
1963 ret = session_destroy(session);
1964
1965 return ret;
1966 }
1967
1968 /*
1969 * Command LTTNG_CALIBRATE processed by the client thread.
1970 */
1971 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1972 {
1973 int ret;
1974
1975 switch (domain) {
1976 case LTTNG_DOMAIN_KERNEL:
1977 {
1978 struct lttng_kernel_calibrate kcalibrate;
1979
1980 kcalibrate.type = calibrate->type;
1981 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1982 if (ret < 0) {
1983 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1984 goto error;
1985 }
1986 break;
1987 }
1988 case LTTNG_DOMAIN_UST:
1989 {
1990 struct lttng_ust_calibrate ucalibrate;
1991
1992 ucalibrate.type = calibrate->type;
1993 ret = ust_app_calibrate_glb(&ucalibrate);
1994 if (ret < 0) {
1995 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1996 goto error;
1997 }
1998 break;
1999 }
2000 default:
2001 ret = LTTNG_ERR_UND;
2002 goto error;
2003 }
2004
2005 ret = LTTNG_OK;
2006
2007 error:
2008 return ret;
2009 }
2010
2011 /*
2012 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2013 */
2014 int cmd_register_consumer(struct ltt_session *session, int domain,
2015 const char *sock_path, struct consumer_data *cdata)
2016 {
2017 int ret, sock;
2018 struct consumer_socket *socket = NULL;
2019
2020 assert(session);
2021 assert(cdata);
2022 assert(sock_path);
2023
2024 switch (domain) {
2025 case LTTNG_DOMAIN_KERNEL:
2026 {
2027 struct ltt_kernel_session *ksess = session->kernel_session;
2028
2029 assert(ksess);
2030
2031 /* Can't register a consumer if there is already one */
2032 if (ksess->consumer_fds_sent != 0) {
2033 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2034 goto error;
2035 }
2036
2037 sock = lttcomm_connect_unix_sock(sock_path);
2038 if (sock < 0) {
2039 ret = LTTNG_ERR_CONNECT_FAIL;
2040 goto error;
2041 }
2042
2043 socket = consumer_allocate_socket(sock);
2044 if (socket == NULL) {
2045 ret = close(sock);
2046 if (ret < 0) {
2047 PERROR("close register consumer");
2048 }
2049 ret = LTTNG_ERR_FATAL;
2050 goto error;
2051 }
2052
2053 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2054 if (socket->lock == NULL) {
2055 PERROR("zmalloc pthread mutex");
2056 ret = LTTNG_ERR_FATAL;
2057 goto error;
2058 }
2059 pthread_mutex_init(socket->lock, NULL);
2060 socket->registered = 1;
2061
2062 rcu_read_lock();
2063 consumer_add_socket(socket, ksess->consumer);
2064 rcu_read_unlock();
2065
2066 pthread_mutex_lock(&cdata->pid_mutex);
2067 cdata->pid = -1;
2068 pthread_mutex_unlock(&cdata->pid_mutex);
2069
2070 break;
2071 }
2072 default:
2073 /* TODO: Userspace tracing */
2074 ret = LTTNG_ERR_UND;
2075 goto error;
2076 }
2077
2078 return LTTNG_OK;
2079
2080 error:
2081 if (socket) {
2082 consumer_destroy_socket(socket);
2083 }
2084 return ret;
2085 }
2086
2087 /*
2088 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2089 */
2090 ssize_t cmd_list_domains(struct ltt_session *session,
2091 struct lttng_domain **domains)
2092 {
2093 int ret, index = 0;
2094 ssize_t nb_dom = 0;
2095
2096 if (session->kernel_session != NULL) {
2097 DBG3("Listing domains found kernel domain");
2098 nb_dom++;
2099 }
2100
2101 if (session->ust_session != NULL) {
2102 DBG3("Listing domains found UST global domain");
2103 nb_dom++;
2104 }
2105
2106 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2107 if (*domains == NULL) {
2108 ret = LTTNG_ERR_FATAL;
2109 goto error;
2110 }
2111
2112 if (session->kernel_session != NULL) {
2113 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2114 index++;
2115 }
2116
2117 if (session->ust_session != NULL) {
2118 (*domains)[index].type = LTTNG_DOMAIN_UST;
2119 (*domains)[index].buf_type = session->ust_session->buffer_type;
2120 index++;
2121 }
2122
2123 return nb_dom;
2124
2125 error:
2126 /* Return negative value to differentiate return code */
2127 return -ret;
2128 }
2129
2130
2131 /*
2132 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2133 */
2134 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2135 struct lttng_channel **channels)
2136 {
2137 int ret;
2138 ssize_t nb_chan = 0;
2139
2140 switch (domain) {
2141 case LTTNG_DOMAIN_KERNEL:
2142 if (session->kernel_session != NULL) {
2143 nb_chan = session->kernel_session->channel_count;
2144 }
2145 DBG3("Number of kernel channels %zd", nb_chan);
2146 if (nb_chan <= 0) {
2147 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2148 }
2149 break;
2150 case LTTNG_DOMAIN_UST:
2151 if (session->ust_session != NULL) {
2152 nb_chan = lttng_ht_get_count(
2153 session->ust_session->domain_global.channels);
2154 }
2155 DBG3("Number of UST global channels %zd", nb_chan);
2156 if (nb_chan <= 0) {
2157 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2158 }
2159 break;
2160 default:
2161 *channels = NULL;
2162 ret = LTTNG_ERR_UND;
2163 goto error;
2164 }
2165
2166 if (nb_chan > 0) {
2167 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2168 if (*channels == NULL) {
2169 ret = LTTNG_ERR_FATAL;
2170 goto error;
2171 }
2172
2173 list_lttng_channels(domain, session, *channels);
2174 } else {
2175 *channels = NULL;
2176 /* Ret value was set in the domain switch case */
2177 goto error;
2178 }
2179
2180 return nb_chan;
2181
2182 error:
2183 /* Return negative value to differentiate return code */
2184 return -ret;
2185 }
2186
2187 /*
2188 * Command LTTNG_LIST_EVENTS processed by the client thread.
2189 */
2190 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2191 char *channel_name, struct lttng_event **events)
2192 {
2193 int ret = 0;
2194 ssize_t nb_event = 0;
2195
2196 switch (domain) {
2197 case LTTNG_DOMAIN_KERNEL:
2198 if (session->kernel_session != NULL) {
2199 nb_event = list_lttng_kernel_events(channel_name,
2200 session->kernel_session, events);
2201 }
2202 break;
2203 case LTTNG_DOMAIN_UST:
2204 {
2205 if (session->ust_session != NULL) {
2206 nb_event = list_lttng_ust_global_events(channel_name,
2207 &session->ust_session->domain_global, events);
2208 }
2209 break;
2210 }
2211 default:
2212 ret = LTTNG_ERR_UND;
2213 goto error;
2214 }
2215
2216 return nb_event;
2217
2218 error:
2219 /* Return negative value to differentiate return code */
2220 return -ret;
2221 }
2222
2223 /*
2224 * Using the session list, filled a lttng_session array to send back to the
2225 * client for session listing.
2226 *
2227 * The session list lock MUST be acquired before calling this function. Use
2228 * session_lock_list() and session_unlock_list().
2229 */
2230 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2231 gid_t gid)
2232 {
2233 int ret;
2234 unsigned int i = 0;
2235 struct ltt_session *session;
2236 struct ltt_session_list *list = session_get_list();
2237
2238 DBG("Getting all available session for UID %d GID %d",
2239 uid, gid);
2240 /*
2241 * Iterate over session list and append data after the control struct in
2242 * the buffer.
2243 */
2244 cds_list_for_each_entry(session, &list->head, list) {
2245 /*
2246 * Only list the sessions the user can control.
2247 */
2248 if (!session_access_ok(session, uid, gid)) {
2249 continue;
2250 }
2251
2252 struct ltt_kernel_session *ksess = session->kernel_session;
2253 struct ltt_ust_session *usess = session->ust_session;
2254
2255 if (session->consumer->type == CONSUMER_DST_NET ||
2256 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2257 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2258 ret = build_network_session_path(sessions[i].path,
2259 sizeof(sessions[i].path), session);
2260 } else {
2261 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2262 session->consumer->dst.trace_path);
2263 }
2264 if (ret < 0) {
2265 PERROR("snprintf session path");
2266 continue;
2267 }
2268
2269 strncpy(sessions[i].name, session->name, NAME_MAX);
2270 sessions[i].name[NAME_MAX - 1] = '\0';
2271 sessions[i].enabled = session->enabled;
2272 sessions[i].snapshot_mode = session->snapshot_mode;
2273 i++;
2274 }
2275 }
2276
2277 /*
2278 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2279 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2280 */
2281 int cmd_data_pending(struct ltt_session *session)
2282 {
2283 int ret;
2284 struct ltt_kernel_session *ksess = session->kernel_session;
2285 struct ltt_ust_session *usess = session->ust_session;
2286
2287 assert(session);
2288
2289 /* Session MUST be stopped to ask for data availability. */
2290 if (session->enabled) {
2291 ret = LTTNG_ERR_SESSION_STARTED;
2292 goto error;
2293 }
2294
2295 if (ksess && ksess->consumer) {
2296 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2297 if (ret == 1) {
2298 /* Data is still being extracted for the kernel. */
2299 goto error;
2300 }
2301 }
2302
2303 if (usess && usess->consumer) {
2304 ret = consumer_is_data_pending(usess->id, usess->consumer);
2305 if (ret == 1) {
2306 /* Data is still being extracted for the kernel. */
2307 goto error;
2308 }
2309 }
2310
2311 /* Data is ready to be read by a viewer */
2312 ret = 0;
2313
2314 error:
2315 return ret;
2316 }
2317
2318 /*
2319 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2320 *
2321 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2322 */
2323 int cmd_snapshot_add_output(struct ltt_session *session,
2324 struct lttng_snapshot_output *output, uint32_t *id)
2325 {
2326 int ret;
2327 struct snapshot_output *new_output;
2328
2329 assert(session);
2330 assert(output);
2331
2332 DBG("Cmd snapshot add output for session %s", session->name);
2333
2334 /*
2335 * Permission denied to create an output if the session is not
2336 * set in no output mode.
2337 */
2338 if (session->output_traces) {
2339 ret = LTTNG_ERR_EPERM;
2340 goto error;
2341 }
2342
2343 /* Only one output is allowed until we have the "tee" feature. */
2344 if (session->snapshot.nb_output == 1) {
2345 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2346 goto error;
2347 }
2348
2349 new_output = snapshot_output_alloc();
2350 if (!new_output) {
2351 ret = LTTNG_ERR_NOMEM;
2352 goto error;
2353 }
2354
2355 ret = snapshot_output_init(output->max_size, output->name,
2356 output->ctrl_url, output->data_url, session->consumer, new_output,
2357 &session->snapshot);
2358 if (ret < 0) {
2359 if (ret == -ENOMEM) {
2360 ret = LTTNG_ERR_NOMEM;
2361 } else {
2362 ret = LTTNG_ERR_INVALID;
2363 }
2364 goto free_error;
2365 }
2366
2367 rcu_read_lock();
2368 snapshot_add_output(&session->snapshot, new_output);
2369 if (id) {
2370 *id = new_output->id;
2371 }
2372 rcu_read_unlock();
2373
2374 return LTTNG_OK;
2375
2376 free_error:
2377 snapshot_output_destroy(new_output);
2378 error:
2379 return ret;
2380 }
2381
2382 /*
2383 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2384 *
2385 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2386 */
2387 int cmd_snapshot_del_output(struct ltt_session *session,
2388 struct lttng_snapshot_output *output)
2389 {
2390 int ret;
2391 struct snapshot_output *sout = NULL;
2392
2393 assert(session);
2394 assert(output);
2395
2396 rcu_read_lock();
2397
2398 /*
2399 * Permission denied to create an output if the session is not
2400 * set in no output mode.
2401 */
2402 if (session->output_traces) {
2403 ret = LTTNG_ERR_EPERM;
2404 goto error;
2405 }
2406
2407 if (output->id) {
2408 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2409 session->name);
2410 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2411 } else if (*output->name != '\0') {
2412 DBG("Cmd snapshot del output name %s for session %s", output->name,
2413 session->name);
2414 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2415 }
2416 if (!sout) {
2417 ret = LTTNG_ERR_INVALID;
2418 goto error;
2419 }
2420
2421 snapshot_delete_output(&session->snapshot, sout);
2422 snapshot_output_destroy(sout);
2423 ret = LTTNG_OK;
2424
2425 error:
2426 rcu_read_unlock();
2427 return ret;
2428 }
2429
2430 /*
2431 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2432 *
2433 * If no output is available, outputs is untouched and 0 is returned.
2434 *
2435 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2436 */
2437 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2438 struct lttng_snapshot_output **outputs)
2439 {
2440 int ret, idx = 0;
2441 struct lttng_snapshot_output *list;
2442 struct lttng_ht_iter iter;
2443 struct snapshot_output *output;
2444
2445 assert(session);
2446 assert(outputs);
2447
2448 DBG("Cmd snapshot list outputs for session %s", session->name);
2449
2450 /*
2451 * Permission denied to create an output if the session is not
2452 * set in no output mode.
2453 */
2454 if (session->output_traces) {
2455 ret = LTTNG_ERR_EPERM;
2456 goto error;
2457 }
2458
2459 if (session->snapshot.nb_output == 0) {
2460 ret = 0;
2461 goto error;
2462 }
2463
2464 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2465 if (!list) {
2466 ret = LTTNG_ERR_NOMEM;
2467 goto error;
2468 }
2469
2470 /* Copy list from session to the new list object. */
2471 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2472 output, node.node) {
2473 assert(output->consumer);
2474 list[idx].id = output->id;
2475 list[idx].max_size = output->max_size;
2476 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2477 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2478 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2479 sizeof(list[idx].ctrl_url));
2480 } else {
2481 /* Control URI. */
2482 ret = uri_to_str_url(&output->consumer->dst.net.control,
2483 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2484 if (ret < 0) {
2485 ret = LTTNG_ERR_NOMEM;
2486 goto free_error;
2487 }
2488
2489 /* Data URI. */
2490 ret = uri_to_str_url(&output->consumer->dst.net.data,
2491 list[idx].data_url, sizeof(list[idx].data_url));
2492 if (ret < 0) {
2493 ret = LTTNG_ERR_NOMEM;
2494 goto free_error;
2495 }
2496 }
2497 idx++;
2498 }
2499
2500 *outputs = list;
2501 return session->snapshot.nb_output;
2502
2503 free_error:
2504 free(list);
2505 error:
2506 return -ret;
2507 }
2508
2509 /*
2510 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2511 * snapshot output is *not* set with a remote destination.
2512 *
2513 * Return 0 on success or a LTTNG_ERR code.
2514 */
2515 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2516 struct snapshot_output *snap_output, struct ltt_session *session)
2517 {
2518 int ret = LTTNG_OK;
2519 struct lttng_ht_iter iter;
2520 struct consumer_socket *socket;
2521
2522 assert(consumer);
2523 assert(snap_output);
2524 assert(session);
2525
2526 DBG2("Set relayd object from snapshot output");
2527
2528 /* Ignore if snapshot consumer output is not network. */
2529 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2530 goto error;
2531 }
2532
2533 /*
2534 * For each consumer socket, create and send the relayd object of the
2535 * snapshot output.
2536 */
2537 rcu_read_lock();
2538 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2539 socket, node.node) {
2540 ret = send_consumer_relayd_sockets(0, session->id,
2541 snap_output->consumer, socket);
2542 if (ret != LTTNG_OK) {
2543 rcu_read_unlock();
2544 goto error;
2545 }
2546 }
2547 rcu_read_unlock();
2548
2549 error:
2550 return ret;
2551 }
2552
2553 /*
2554 * Record a kernel snapshot.
2555 *
2556 * Return 0 on success or a LTTNG_ERR code.
2557 */
2558 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2559 struct snapshot_output *output, struct ltt_session *session,
2560 int wait, int nb_streams)
2561 {
2562 int ret;
2563
2564 assert(ksess);
2565 assert(output);
2566 assert(session);
2567
2568 /* Get the datetime for the snapshot output directory. */
2569 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2570 sizeof(output->datetime));
2571 if (!ret) {
2572 ret = LTTNG_ERR_INVALID;
2573 goto error;
2574 }
2575
2576 /*
2577 * Copy kernel session sockets so we can communicate with the right
2578 * consumer for the snapshot record command.
2579 */
2580 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2581 if (ret < 0) {
2582 ret = LTTNG_ERR_NOMEM;
2583 goto error;
2584 }
2585
2586 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2587 if (ret != LTTNG_OK) {
2588 goto error_snapshot;
2589 }
2590
2591 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2592 if (ret < 0) {
2593 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2594 if (ret == -EINVAL) {
2595 ret = LTTNG_ERR_INVALID;
2596 }
2597 goto error_snapshot;
2598 }
2599
2600 ret = LTTNG_OK;
2601
2602 error_snapshot:
2603 /* Clean up copied sockets so this output can use some other later on. */
2604 consumer_destroy_output_sockets(output->consumer);
2605 error:
2606 return ret;
2607 }
2608
2609 /*
2610 * Record a UST snapshot.
2611 *
2612 * Return 0 on success or a LTTNG_ERR error code.
2613 */
2614 static int record_ust_snapshot(struct ltt_ust_session *usess,
2615 struct snapshot_output *output, struct ltt_session *session,
2616 int wait, int nb_streams)
2617 {
2618 int ret;
2619
2620 assert(usess);
2621 assert(output);
2622 assert(session);
2623
2624 /* Get the datetime for the snapshot output directory. */
2625 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2626 sizeof(output->datetime));
2627 if (!ret) {
2628 ret = LTTNG_ERR_INVALID;
2629 goto error;
2630 }
2631
2632 /*
2633 * Copy UST session sockets so we can communicate with the right
2634 * consumer for the snapshot record command.
2635 */
2636 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2637 if (ret < 0) {
2638 ret = LTTNG_ERR_NOMEM;
2639 goto error;
2640 }
2641
2642 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2643 if (ret != LTTNG_OK) {
2644 goto error_snapshot;
2645 }
2646
2647 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2648 if (ret < 0) {
2649 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2650 if (ret == -EINVAL) {
2651 ret = LTTNG_ERR_INVALID;
2652 }
2653 goto error_snapshot;
2654 }
2655
2656 ret = LTTNG_OK;
2657
2658 error_snapshot:
2659 /* Clean up copied sockets so this output can use some other later on. */
2660 consumer_destroy_output_sockets(output->consumer);
2661 error:
2662 return ret;
2663 }
2664
2665 /*
2666 * Returns the total number of streams for a session or a negative value
2667 * on error.
2668 */
2669 static unsigned int get_total_nb_stream(struct ltt_session *session)
2670 {
2671 unsigned int total_streams = 0;
2672
2673 if (session->kernel_session) {
2674 struct ltt_kernel_session *ksess = session->kernel_session;
2675
2676 total_streams += ksess->stream_count_global;
2677 }
2678
2679 if (session->ust_session) {
2680 struct ltt_ust_session *usess = session->ust_session;
2681
2682 total_streams += ust_app_get_nb_stream(usess);
2683 }
2684
2685 return total_streams;
2686 }
2687
2688 /*
2689 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2690 *
2691 * The wait parameter is ignored so this call always wait for the snapshot to
2692 * complete before returning.
2693 *
2694 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2695 */
2696 int cmd_snapshot_record(struct ltt_session *session,
2697 struct lttng_snapshot_output *output, int wait)
2698 {
2699 int ret = LTTNG_OK;
2700 unsigned int use_tmp_output = 0;
2701 struct snapshot_output tmp_output;
2702 unsigned int nb_streams, snapshot_success = 0;
2703
2704 assert(session);
2705
2706 DBG("Cmd snapshot record for session %s", session->name);
2707
2708 /*
2709 * Permission denied to create an output if the session is not
2710 * set in no output mode.
2711 */
2712 if (session->output_traces) {
2713 ret = LTTNG_ERR_EPERM;
2714 goto error;
2715 }
2716
2717 /* The session needs to be started at least once. */
2718 if (!session->started) {
2719 ret = LTTNG_ERR_START_SESSION_ONCE;
2720 goto error;
2721 }
2722
2723 /* Use temporary output for the session. */
2724 if (output && *output->ctrl_url != '\0') {
2725 ret = snapshot_output_init(output->max_size, output->name,
2726 output->ctrl_url, output->data_url, session->consumer,
2727 &tmp_output, NULL);
2728 if (ret < 0) {
2729 if (ret == -ENOMEM) {
2730 ret = LTTNG_ERR_NOMEM;
2731 } else {
2732 ret = LTTNG_ERR_INVALID;
2733 }
2734 goto error;
2735 }
2736 /* Use the global session count for the temporary snapshot. */
2737 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2738 use_tmp_output = 1;
2739 }
2740
2741 /*
2742 * Get the total number of stream of that session which is used by the
2743 * maximum size of the snapshot feature.
2744 */
2745 nb_streams = get_total_nb_stream(session);
2746
2747 if (session->kernel_session) {
2748 struct ltt_kernel_session *ksess = session->kernel_session;
2749
2750 if (use_tmp_output) {
2751 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2752 wait, nb_streams);
2753 if (ret != LTTNG_OK) {
2754 goto error;
2755 }
2756 snapshot_success = 1;
2757 } else {
2758 struct snapshot_output *sout;
2759 struct lttng_ht_iter iter;
2760
2761 rcu_read_lock();
2762 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2763 &iter.iter, sout, node.node) {
2764 /*
2765 * Make a local copy of the output and assign the possible
2766 * temporary value given by the caller.
2767 */
2768 memset(&tmp_output, 0, sizeof(tmp_output));
2769 memcpy(&tmp_output, sout, sizeof(tmp_output));
2770
2771 /* Use temporary max size. */
2772 if (output->max_size != (uint64_t) -1ULL) {
2773 tmp_output.max_size = output->max_size;
2774 }
2775
2776 /* Use temporary name. */
2777 if (*output->name != '\0') {
2778 strncpy(tmp_output.name, output->name,
2779 sizeof(tmp_output.name));
2780 }
2781
2782 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2783
2784 ret = record_kernel_snapshot(ksess, &tmp_output,
2785 session, wait, nb_streams);
2786 if (ret != LTTNG_OK) {
2787 rcu_read_unlock();
2788 goto error;
2789 }
2790 snapshot_success = 1;
2791 }
2792 rcu_read_unlock();
2793 }
2794 }
2795
2796 if (session->ust_session) {
2797 struct ltt_ust_session *usess = session->ust_session;
2798
2799 if (use_tmp_output) {
2800 ret = record_ust_snapshot(usess, &tmp_output, session,
2801 wait, nb_streams);
2802 if (ret != LTTNG_OK) {
2803 goto error;
2804 }
2805 snapshot_success = 1;
2806 } else {
2807 struct snapshot_output *sout;
2808 struct lttng_ht_iter iter;
2809
2810 rcu_read_lock();
2811 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2812 &iter.iter, sout, node.node) {
2813 /*
2814 * Make a local copy of the output and assign the possible
2815 * temporary value given by the caller.
2816 */
2817 memset(&tmp_output, 0, sizeof(tmp_output));
2818 memcpy(&tmp_output, sout, sizeof(tmp_output));
2819
2820 /* Use temporary max size. */
2821 if (output->max_size != (uint64_t) -1ULL) {
2822 tmp_output.max_size = output->max_size;
2823 }
2824
2825 /* Use temporary name. */
2826 if (*output->name != '\0') {
2827 strncpy(tmp_output.name, output->name,
2828 sizeof(tmp_output.name));
2829 }
2830
2831 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2832
2833 ret = record_ust_snapshot(usess, &tmp_output, session,
2834 wait, nb_streams);
2835 if (ret != LTTNG_OK) {
2836 rcu_read_unlock();
2837 goto error;
2838 }
2839 snapshot_success = 1;
2840 }
2841 rcu_read_unlock();
2842 }
2843 }
2844
2845 if (snapshot_success) {
2846 session->snapshot.nb_snapshot++;
2847 }
2848
2849 error:
2850 return ret;
2851 }
2852
2853 /*
2854 * Init command subsystem.
2855 */
2856 void cmd_init(void)
2857 {
2858 /*
2859 * Set network sequence index to 1 for streams to match a relayd
2860 * socket on the consumer side.
2861 */
2862 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2863 relayd_net_seq_idx = 1;
2864 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2865
2866 DBG("Command subsystem initialized");
2867 }
LTTng 2.0 tools and control repository
This page took 0.089913 seconds and 4 git commands to generate.