Live timer set up
[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 /*
854 * Don't try to enable a channel if the session has been started at
855 * some point in time before. The tracer does not allow it.
856 */
857 if (session->started) {
858 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
859 goto error;
860 }
861
862 /*
863 * If the session is a live session, remove the switch timer, the
864 * live timer does the same thing but sends also synchronisation
865 * beacons for inactive streams.
866 */
867 if (session->live_timer > 0) {
868 attr->attr.live_timer_interval = session->live_timer;
869 attr->attr.switch_timer_interval = 0;
870 }
871
872 switch (domain->type) {
873 case LTTNG_DOMAIN_KERNEL:
874 {
875 struct ltt_kernel_channel *kchan;
876
877 kchan = trace_kernel_get_channel_by_name(attr->name,
878 session->kernel_session);
879 if (kchan == NULL) {
880 /*
881 * Don't try to create a channel if the session
882 * has been started at some point in time
883 * before. The tracer does not allow it.
884 */
885 if (session->started) {
886 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
887 goto error;
888 }
889 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
890 if (attr->name[0] != '\0') {
891 session->kernel_session->has_non_default_channel = 1;
892 }
893 } else {
894 ret = channel_kernel_enable(session->kernel_session, kchan);
895 }
896
897 if (ret != LTTNG_OK) {
898 goto error;
899 }
900
901 kernel_wait_quiescent(kernel_tracer_fd);
902 break;
903 }
904 case LTTNG_DOMAIN_UST:
905 {
906 struct ltt_ust_channel *uchan;
907
908 chan_ht = usess->domain_global.channels;
909
910 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
911 if (uchan == NULL) {
912 /*
913 * Don't try to create a channel if the session
914 * has been started at some point in time
915 * before. The tracer does not allow it.
916 */
917 if (session->started) {
918 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
919 goto error;
920 }
921 ret = channel_ust_create(usess, attr, domain->buf_type);
922 if (attr->name[0] != '\0') {
923 usess->has_non_default_channel = 1;
924 }
925 } else {
926 ret = channel_ust_enable(usess, uchan);
927 }
928 break;
929 }
930 default:
931 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
932 goto error;
933 }
934
935 error:
936 rcu_read_unlock();
937 return ret;
938 }
939
940
941 /*
942 * Command LTTNG_DISABLE_EVENT processed by the client thread.
943 */
944 int cmd_disable_event(struct ltt_session *session, int domain,
945 char *channel_name, char *event_name)
946 {
947 int ret;
948
949 rcu_read_lock();
950
951 switch (domain) {
952 case LTTNG_DOMAIN_KERNEL:
953 {
954 struct ltt_kernel_channel *kchan;
955 struct ltt_kernel_session *ksess;
956
957 ksess = session->kernel_session;
958
959 /*
960 * If a non-default channel has been created in the
961 * session, explicitely require that -c chan_name needs
962 * to be provided.
963 */
964 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
965 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
966 goto error;
967 }
968
969 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
970 if (kchan == NULL) {
971 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
972 goto error;
973 }
974
975 ret = event_kernel_disable_tracepoint(kchan, event_name);
976 if (ret != LTTNG_OK) {
977 goto error;
978 }
979
980 kernel_wait_quiescent(kernel_tracer_fd);
981 break;
982 }
983 case LTTNG_DOMAIN_UST:
984 {
985 struct ltt_ust_channel *uchan;
986 struct ltt_ust_session *usess;
987
988 usess = session->ust_session;
989
990 /*
991 * If a non-default channel has been created in the
992 * session, explicitely require that -c chan_name needs
993 * to be provided.
994 */
995 if (usess->has_non_default_channel && channel_name[0] == '\0') {
996 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
997 goto error;
998 }
999
1000 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1001 channel_name);
1002 if (uchan == NULL) {
1003 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1004 goto error;
1005 }
1006
1007 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1008 if (ret != LTTNG_OK) {
1009 goto error;
1010 }
1011
1012 DBG3("Disable UST event %s in channel %s completed", event_name,
1013 channel_name);
1014 break;
1015 }
1016 #if 0
1017 case LTTNG_DOMAIN_UST_EXEC_NAME:
1018 case LTTNG_DOMAIN_UST_PID:
1019 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1020 #endif
1021 default:
1022 ret = LTTNG_ERR_UND;
1023 goto error;
1024 }
1025
1026 ret = LTTNG_OK;
1027
1028 error:
1029 rcu_read_unlock();
1030 return ret;
1031 }
1032
1033 /*
1034 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1035 */
1036 int cmd_disable_event_all(struct ltt_session *session, int domain,
1037 char *channel_name)
1038 {
1039 int ret;
1040
1041 rcu_read_lock();
1042
1043 switch (domain) {
1044 case LTTNG_DOMAIN_KERNEL:
1045 {
1046 struct ltt_kernel_session *ksess;
1047 struct ltt_kernel_channel *kchan;
1048
1049 ksess = session->kernel_session;
1050
1051 /*
1052 * If a non-default channel has been created in the
1053 * session, explicitely require that -c chan_name needs
1054 * to be provided.
1055 */
1056 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1057 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1058 goto error;
1059 }
1060
1061 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1062 if (kchan == NULL) {
1063 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1064 goto error;
1065 }
1066
1067 ret = event_kernel_disable_all(kchan);
1068 if (ret != LTTNG_OK) {
1069 goto error;
1070 }
1071
1072 kernel_wait_quiescent(kernel_tracer_fd);
1073 break;
1074 }
1075 case LTTNG_DOMAIN_UST:
1076 {
1077 struct ltt_ust_session *usess;
1078 struct ltt_ust_channel *uchan;
1079
1080 usess = session->ust_session;
1081
1082 /*
1083 * If a non-default channel has been created in the
1084 * session, explicitely require that -c chan_name needs
1085 * to be provided.
1086 */
1087 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1088 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1089 goto error;
1090 }
1091
1092 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1093 channel_name);
1094 if (uchan == NULL) {
1095 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1096 goto error;
1097 }
1098
1099 ret = event_ust_disable_all_tracepoints(usess, uchan);
1100 if (ret != 0) {
1101 goto error;
1102 }
1103
1104 DBG3("Disable all UST events in channel %s completed", channel_name);
1105
1106 break;
1107 }
1108 #if 0
1109 case LTTNG_DOMAIN_UST_EXEC_NAME:
1110 case LTTNG_DOMAIN_UST_PID:
1111 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1112 #endif
1113 default:
1114 ret = LTTNG_ERR_UND;
1115 goto error;
1116 }
1117
1118 ret = LTTNG_OK;
1119
1120 error:
1121 rcu_read_unlock();
1122 return ret;
1123 }
1124
1125 /*
1126 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1127 */
1128 int cmd_add_context(struct ltt_session *session, int domain,
1129 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1130 {
1131 int ret, chan_kern_created = 0, chan_ust_created = 0;
1132
1133 switch (domain) {
1134 case LTTNG_DOMAIN_KERNEL:
1135 assert(session->kernel_session);
1136
1137 if (session->kernel_session->channel_count == 0) {
1138 /* Create default channel */
1139 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1140 if (ret != LTTNG_OK) {
1141 goto error;
1142 }
1143 chan_kern_created = 1;
1144 }
1145 /* Add kernel context to kernel tracer */
1146 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1147 if (ret != LTTNG_OK) {
1148 goto error;
1149 }
1150 break;
1151 case LTTNG_DOMAIN_UST:
1152 {
1153 struct ltt_ust_session *usess = session->ust_session;
1154 unsigned int chan_count;
1155
1156 assert(usess);
1157
1158 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1159 if (chan_count == 0) {
1160 struct lttng_channel *attr;
1161 /* Create default channel */
1162 attr = channel_new_default_attr(domain, usess->buffer_type);
1163 if (attr == NULL) {
1164 ret = LTTNG_ERR_FATAL;
1165 goto error;
1166 }
1167
1168 ret = channel_ust_create(usess, attr, usess->buffer_type);
1169 if (ret != LTTNG_OK) {
1170 free(attr);
1171 goto error;
1172 }
1173 free(attr);
1174 chan_ust_created = 1;
1175 }
1176
1177 ret = context_ust_add(usess, domain, ctx, channel_name);
1178 if (ret != LTTNG_OK) {
1179 goto error;
1180 }
1181 break;
1182 }
1183 #if 0
1184 case LTTNG_DOMAIN_UST_EXEC_NAME:
1185 case LTTNG_DOMAIN_UST_PID:
1186 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1187 #endif
1188 default:
1189 ret = LTTNG_ERR_UND;
1190 goto error;
1191 }
1192
1193 return LTTNG_OK;
1194
1195 error:
1196 if (chan_kern_created) {
1197 struct ltt_kernel_channel *kchan =
1198 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1199 session->kernel_session);
1200 /* Created previously, this should NOT fail. */
1201 assert(kchan);
1202 kernel_destroy_channel(kchan);
1203 }
1204
1205 if (chan_ust_created) {
1206 struct ltt_ust_channel *uchan =
1207 trace_ust_find_channel_by_name(
1208 session->ust_session->domain_global.channels,
1209 DEFAULT_CHANNEL_NAME);
1210 /* Created previously, this should NOT fail. */
1211 assert(uchan);
1212 /* Remove from the channel list of the session. */
1213 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1214 uchan);
1215 trace_ust_destroy_channel(uchan);
1216 }
1217 return ret;
1218 }
1219
1220 /*
1221 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1222 */
1223 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1224 char *channel_name, struct lttng_event *event,
1225 struct lttng_filter_bytecode *filter, int wpipe)
1226 {
1227 int ret, channel_created = 0;
1228 struct lttng_channel *attr;
1229
1230 assert(session);
1231 assert(event);
1232 assert(channel_name);
1233
1234 rcu_read_lock();
1235
1236 switch (domain->type) {
1237 case LTTNG_DOMAIN_KERNEL:
1238 {
1239 struct ltt_kernel_channel *kchan;
1240
1241 /*
1242 * If a non-default channel has been created in the
1243 * session, explicitely require that -c chan_name needs
1244 * to be provided.
1245 */
1246 if (session->kernel_session->has_non_default_channel
1247 && channel_name[0] == '\0') {
1248 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1249 goto error;
1250 }
1251
1252 kchan = trace_kernel_get_channel_by_name(channel_name,
1253 session->kernel_session);
1254 if (kchan == NULL) {
1255 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1256 LTTNG_BUFFER_GLOBAL);
1257 if (attr == NULL) {
1258 ret = LTTNG_ERR_FATAL;
1259 goto error;
1260 }
1261 strncpy(attr->name, channel_name, sizeof(attr->name));
1262
1263 ret = cmd_enable_channel(session, domain, attr, wpipe);
1264 if (ret != LTTNG_OK) {
1265 free(attr);
1266 goto error;
1267 }
1268 free(attr);
1269
1270 channel_created = 1;
1271 }
1272
1273 /* Get the newly created kernel channel pointer */
1274 kchan = trace_kernel_get_channel_by_name(channel_name,
1275 session->kernel_session);
1276 if (kchan == NULL) {
1277 /* This sould not happen... */
1278 ret = LTTNG_ERR_FATAL;
1279 goto error;
1280 }
1281
1282 ret = event_kernel_enable_tracepoint(kchan, event);
1283 if (ret != LTTNG_OK) {
1284 if (channel_created) {
1285 /* Let's not leak a useless channel. */
1286 kernel_destroy_channel(kchan);
1287 }
1288 goto error;
1289 }
1290
1291 kernel_wait_quiescent(kernel_tracer_fd);
1292 break;
1293 }
1294 case LTTNG_DOMAIN_UST:
1295 {
1296 struct ltt_ust_channel *uchan;
1297 struct ltt_ust_session *usess = session->ust_session;
1298
1299 assert(usess);
1300
1301 /*
1302 * If a non-default channel has been created in the
1303 * session, explicitely require that -c chan_name needs
1304 * to be provided.
1305 */
1306 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1307 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1308 goto error;
1309 }
1310
1311 /* Get channel from global UST domain */
1312 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1313 channel_name);
1314 if (uchan == NULL) {
1315 /* Create default channel */
1316 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1317 usess->buffer_type);
1318 if (attr == NULL) {
1319 ret = LTTNG_ERR_FATAL;
1320 goto error;
1321 }
1322 strncpy(attr->name, channel_name, sizeof(attr->name));
1323
1324 ret = cmd_enable_channel(session, domain, attr, wpipe);
1325 if (ret != LTTNG_OK) {
1326 free(attr);
1327 goto error;
1328 }
1329 free(attr);
1330
1331 /* Get the newly created channel reference back */
1332 uchan = trace_ust_find_channel_by_name(
1333 usess->domain_global.channels, channel_name);
1334 assert(uchan);
1335 }
1336
1337 /* At this point, the session and channel exist on the tracer */
1338 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1339 if (ret != LTTNG_OK) {
1340 goto error;
1341 }
1342 break;
1343 }
1344 #if 0
1345 case LTTNG_DOMAIN_UST_EXEC_NAME:
1346 case LTTNG_DOMAIN_UST_PID:
1347 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1348 #endif
1349 default:
1350 ret = LTTNG_ERR_UND;
1351 goto error;
1352 }
1353
1354 ret = LTTNG_OK;
1355
1356 error:
1357 rcu_read_unlock();
1358 return ret;
1359 }
1360
1361 /*
1362 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1363 */
1364 int cmd_enable_event_all(struct ltt_session *session,
1365 struct lttng_domain *domain, char *channel_name, int event_type,
1366 struct lttng_filter_bytecode *filter, int wpipe)
1367 {
1368 int ret;
1369 struct lttng_channel *attr;
1370
1371 assert(session);
1372 assert(channel_name);
1373
1374 rcu_read_lock();
1375
1376 switch (domain->type) {
1377 case LTTNG_DOMAIN_KERNEL:
1378 {
1379 struct ltt_kernel_channel *kchan;
1380
1381 assert(session->kernel_session);
1382
1383 /*
1384 * If a non-default channel has been created in the
1385 * session, explicitely require that -c chan_name needs
1386 * to be provided.
1387 */
1388 if (session->kernel_session->has_non_default_channel
1389 && channel_name[0] == '\0') {
1390 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1391 goto error;
1392 }
1393
1394 kchan = trace_kernel_get_channel_by_name(channel_name,
1395 session->kernel_session);
1396 if (kchan == NULL) {
1397 /* Create default channel */
1398 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1399 LTTNG_BUFFER_GLOBAL);
1400 if (attr == NULL) {
1401 ret = LTTNG_ERR_FATAL;
1402 goto error;
1403 }
1404 strncpy(attr->name, channel_name, sizeof(attr->name));
1405
1406 ret = cmd_enable_channel(session, domain, attr, wpipe);
1407 if (ret != LTTNG_OK) {
1408 free(attr);
1409 goto error;
1410 }
1411 free(attr);
1412
1413 /* Get the newly created kernel channel pointer */
1414 kchan = trace_kernel_get_channel_by_name(channel_name,
1415 session->kernel_session);
1416 assert(kchan);
1417 }
1418
1419 switch (event_type) {
1420 case LTTNG_EVENT_SYSCALL:
1421 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1422 break;
1423 case LTTNG_EVENT_TRACEPOINT:
1424 /*
1425 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1426 * events already registered to the channel.
1427 */
1428 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1429 break;
1430 case LTTNG_EVENT_ALL:
1431 /* Enable syscalls and tracepoints */
1432 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1433 break;
1434 default:
1435 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1436 goto error;
1437 }
1438
1439 /* Manage return value */
1440 if (ret != LTTNG_OK) {
1441 /*
1442 * On error, cmd_enable_channel call will take care of destroying
1443 * the created channel if it was needed.
1444 */
1445 goto error;
1446 }
1447
1448 kernel_wait_quiescent(kernel_tracer_fd);
1449 break;
1450 }
1451 case LTTNG_DOMAIN_UST:
1452 {
1453 struct ltt_ust_channel *uchan;
1454 struct ltt_ust_session *usess = session->ust_session;
1455
1456 assert(usess);
1457
1458 /*
1459 * If a non-default channel has been created in the
1460 * session, explicitely require that -c chan_name needs
1461 * to be provided.
1462 */
1463 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1464 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1465 goto error;
1466 }
1467
1468 /* Get channel from global UST domain */
1469 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1470 channel_name);
1471 if (uchan == NULL) {
1472 /* Create default channel */
1473 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1474 usess->buffer_type);
1475 if (attr == NULL) {
1476 ret = LTTNG_ERR_FATAL;
1477 goto error;
1478 }
1479 strncpy(attr->name, channel_name, sizeof(attr->name));
1480
1481 ret = cmd_enable_channel(session, domain, attr, wpipe);
1482 if (ret != LTTNG_OK) {
1483 free(attr);
1484 goto error;
1485 }
1486 free(attr);
1487
1488 /* Get the newly created channel reference back */
1489 uchan = trace_ust_find_channel_by_name(
1490 usess->domain_global.channels, channel_name);
1491 assert(uchan);
1492 }
1493
1494 /* At this point, the session and channel exist on the tracer */
1495
1496 switch (event_type) {
1497 case LTTNG_EVENT_ALL:
1498 case LTTNG_EVENT_TRACEPOINT:
1499 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1500 if (ret != LTTNG_OK) {
1501 goto error;
1502 }
1503 break;
1504 default:
1505 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1506 goto error;
1507 }
1508
1509 /* Manage return value */
1510 if (ret != LTTNG_OK) {
1511 goto error;
1512 }
1513
1514 break;
1515 }
1516 #if 0
1517 case LTTNG_DOMAIN_UST_EXEC_NAME:
1518 case LTTNG_DOMAIN_UST_PID:
1519 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1520 #endif
1521 default:
1522 ret = LTTNG_ERR_UND;
1523 goto error;
1524 }
1525
1526 ret = LTTNG_OK;
1527
1528 error:
1529 rcu_read_unlock();
1530 return ret;
1531 }
1532
1533
1534 /*
1535 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1536 */
1537 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1538 {
1539 int ret;
1540 ssize_t nb_events = 0;
1541
1542 switch (domain) {
1543 case LTTNG_DOMAIN_KERNEL:
1544 nb_events = kernel_list_events(kernel_tracer_fd, events);
1545 if (nb_events < 0) {
1546 ret = LTTNG_ERR_KERN_LIST_FAIL;
1547 goto error;
1548 }
1549 break;
1550 case LTTNG_DOMAIN_UST:
1551 nb_events = ust_app_list_events(events);
1552 if (nb_events < 0) {
1553 ret = LTTNG_ERR_UST_LIST_FAIL;
1554 goto error;
1555 }
1556 break;
1557 default:
1558 ret = LTTNG_ERR_UND;
1559 goto error;
1560 }
1561
1562 return nb_events;
1563
1564 error:
1565 /* Return negative value to differentiate return code */
1566 return -ret;
1567 }
1568
1569 /*
1570 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1571 */
1572 ssize_t cmd_list_tracepoint_fields(int domain,
1573 struct lttng_event_field **fields)
1574 {
1575 int ret;
1576 ssize_t nb_fields = 0;
1577
1578 switch (domain) {
1579 case LTTNG_DOMAIN_UST:
1580 nb_fields = ust_app_list_event_fields(fields);
1581 if (nb_fields < 0) {
1582 ret = LTTNG_ERR_UST_LIST_FAIL;
1583 goto error;
1584 }
1585 break;
1586 case LTTNG_DOMAIN_KERNEL:
1587 default: /* fall-through */
1588 ret = LTTNG_ERR_UND;
1589 goto error;
1590 }
1591
1592 return nb_fields;
1593
1594 error:
1595 /* Return negative value to differentiate return code */
1596 return -ret;
1597 }
1598
1599 /*
1600 * Command LTTNG_START_TRACE processed by the client thread.
1601 */
1602 int cmd_start_trace(struct ltt_session *session)
1603 {
1604 int ret;
1605 struct ltt_kernel_session *ksession;
1606 struct ltt_ust_session *usess;
1607
1608 assert(session);
1609
1610 /* Ease our life a bit ;) */
1611 ksession = session->kernel_session;
1612 usess = session->ust_session;
1613
1614 if (session->enabled) {
1615 /* Already started. */
1616 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1617 goto error;
1618 }
1619
1620 session->enabled = 1;
1621
1622 /* Kernel tracing */
1623 if (ksession != NULL) {
1624 ret = start_kernel_session(ksession, kernel_tracer_fd);
1625 if (ret != LTTNG_OK) {
1626 goto error;
1627 }
1628 }
1629
1630 /* Flag session that trace should start automatically */
1631 if (usess) {
1632 usess->start_trace = 1;
1633
1634 ret = ust_app_start_trace_all(usess);
1635 if (ret < 0) {
1636 ret = LTTNG_ERR_UST_START_FAIL;
1637 goto error;
1638 }
1639 }
1640
1641 session->started = 1;
1642
1643 ret = LTTNG_OK;
1644
1645 error:
1646 return ret;
1647 }
1648
1649 /*
1650 * Command LTTNG_STOP_TRACE processed by the client thread.
1651 */
1652 int cmd_stop_trace(struct ltt_session *session)
1653 {
1654 int ret;
1655 struct ltt_kernel_channel *kchan;
1656 struct ltt_kernel_session *ksession;
1657 struct ltt_ust_session *usess;
1658
1659 assert(session);
1660
1661 /* Short cut */
1662 ksession = session->kernel_session;
1663 usess = session->ust_session;
1664
1665 if (!session->enabled) {
1666 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1667 goto error;
1668 }
1669
1670 session->enabled = 0;
1671
1672 /* Kernel tracer */
1673 if (ksession && ksession->started) {
1674 DBG("Stop kernel tracing");
1675
1676 /* Flush metadata if exist */
1677 if (ksession->metadata_stream_fd >= 0) {
1678 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1679 if (ret < 0) {
1680 ERR("Kernel metadata flush failed");
1681 }
1682 }
1683
1684 /* Flush all buffers before stopping */
1685 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1686 ret = kernel_flush_buffer(kchan);
1687 if (ret < 0) {
1688 ERR("Kernel flush buffer error");
1689 }
1690 }
1691
1692 ret = kernel_stop_session(ksession);
1693 if (ret < 0) {
1694 ret = LTTNG_ERR_KERN_STOP_FAIL;
1695 goto error;
1696 }
1697
1698 kernel_wait_quiescent(kernel_tracer_fd);
1699
1700 ksession->started = 0;
1701 }
1702
1703 if (usess && usess->start_trace) {
1704 usess->start_trace = 0;
1705
1706 ret = ust_app_stop_trace_all(usess);
1707 if (ret < 0) {
1708 ret = LTTNG_ERR_UST_STOP_FAIL;
1709 goto error;
1710 }
1711 }
1712
1713 ret = LTTNG_OK;
1714
1715 error:
1716 return ret;
1717 }
1718
1719 /*
1720 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1721 */
1722 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1723 size_t nb_uri, struct lttng_uri *uris)
1724 {
1725 int ret, i;
1726 struct ltt_kernel_session *ksess = session->kernel_session;
1727 struct ltt_ust_session *usess = session->ust_session;
1728 struct consumer_output *consumer = NULL;
1729
1730 assert(session);
1731 assert(uris);
1732 assert(nb_uri > 0);
1733
1734 /* Can't enable consumer after session started. */
1735 if (session->enabled) {
1736 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1737 goto error;
1738 }
1739
1740 /*
1741 * This case switch makes sure the domain session has a temporary consumer
1742 * so the URL can be set.
1743 */
1744 switch (domain) {
1745 case 0:
1746 /* Code flow error. A session MUST always have a consumer object */
1747 assert(session->consumer);
1748 /*
1749 * The URL will be added to the tracing session consumer instead of a
1750 * specific domain consumer.
1751 */
1752 consumer = session->consumer;
1753 break;
1754 case LTTNG_DOMAIN_KERNEL:
1755 /* Code flow error if we don't have a kernel session here. */
1756 assert(ksess);
1757 assert(ksess->consumer);
1758 consumer = ksess->consumer;
1759 break;
1760 case LTTNG_DOMAIN_UST:
1761 /* Code flow error if we don't have a kernel session here. */
1762 assert(usess);
1763 assert(usess->consumer);
1764 consumer = usess->consumer;
1765 break;
1766 }
1767
1768 for (i = 0; i < nb_uri; i++) {
1769 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1770 if (ret != LTTNG_OK) {
1771 goto error;
1772 }
1773 }
1774
1775 /* All good! */
1776 ret = LTTNG_OK;
1777
1778 error:
1779 return ret;
1780 }
1781
1782 /*
1783 * Command LTTNG_CREATE_SESSION processed by the client thread.
1784 */
1785 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1786 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
1787 {
1788 int ret;
1789 struct ltt_session *session;
1790
1791 assert(name);
1792 assert(creds);
1793
1794 /*
1795 * Verify if the session already exist
1796 *
1797 * XXX: There is no need for the session lock list here since the caller
1798 * (process_client_msg) is holding it. We might want to change that so a
1799 * single command does not lock the entire session list.
1800 */
1801 session = session_find_by_name(name);
1802 if (session != NULL) {
1803 ret = LTTNG_ERR_EXIST_SESS;
1804 goto find_error;
1805 }
1806
1807 /* Create tracing session in the registry */
1808 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1809 LTTNG_SOCK_GET_GID_CRED(creds));
1810 if (ret != LTTNG_OK) {
1811 goto session_error;
1812 }
1813
1814 /*
1815 * Get the newly created session pointer back
1816 *
1817 * XXX: There is no need for the session lock list here since the caller
1818 * (process_client_msg) is holding it. We might want to change that so a
1819 * single command does not lock the entire session list.
1820 */
1821 session = session_find_by_name(name);
1822 assert(session);
1823
1824 session->live_timer = live_timer;
1825 /* Create default consumer output for the session not yet created. */
1826 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1827 if (session->consumer == NULL) {
1828 ret = LTTNG_ERR_FATAL;
1829 goto consumer_error;
1830 }
1831
1832 if (uris) {
1833 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1834 if (ret != LTTNG_OK) {
1835 goto consumer_error;
1836 }
1837 session->output_traces = 1;
1838 } else {
1839 session->output_traces = 0;
1840 DBG2("Session %s created with no output", session->name);
1841 }
1842
1843 session->consumer->enabled = 1;
1844
1845 return LTTNG_OK;
1846
1847 consumer_error:
1848 session_destroy(session);
1849 session_error:
1850 find_error:
1851 return ret;
1852 }
1853
1854 /*
1855 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1856 */
1857 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
1858 size_t nb_uri, lttng_sock_cred *creds)
1859 {
1860 int ret;
1861 struct ltt_session *session;
1862 struct snapshot_output *new_output = NULL;
1863
1864 assert(name);
1865 assert(creds);
1866
1867 /*
1868 * Create session in no output mode with URIs set to NULL. The uris we've
1869 * received are for a default snapshot output if one.
1870 */
1871 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
1872 if (ret != LTTNG_OK) {
1873 goto error;
1874 }
1875
1876 /* Get the newly created session pointer back. This should NEVER fail. */
1877 session = session_find_by_name(name);
1878 assert(session);
1879
1880 /* Flag session for snapshot mode. */
1881 session->snapshot_mode = 1;
1882
1883 /* Skip snapshot output creation if no URI is given. */
1884 if (nb_uri == 0) {
1885 goto end;
1886 }
1887
1888 new_output = snapshot_output_alloc();
1889 if (!new_output) {
1890 ret = LTTNG_ERR_NOMEM;
1891 goto error_snapshot_alloc;
1892 }
1893
1894 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
1895 uris, nb_uri, session->consumer, new_output, &session->snapshot);
1896 if (ret < 0) {
1897 if (ret == -ENOMEM) {
1898 ret = LTTNG_ERR_NOMEM;
1899 } else {
1900 ret = LTTNG_ERR_INVALID;
1901 }
1902 goto error_snapshot;
1903 }
1904
1905 rcu_read_lock();
1906 snapshot_add_output(&session->snapshot, new_output);
1907 rcu_read_unlock();
1908
1909 end:
1910 return LTTNG_OK;
1911
1912 error_snapshot:
1913 snapshot_output_destroy(new_output);
1914 error_snapshot_alloc:
1915 session_destroy(session);
1916 error:
1917 return ret;
1918 }
1919
1920 /*
1921 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1922 */
1923 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1924 {
1925 int ret;
1926 struct ltt_ust_session *usess;
1927 struct ltt_kernel_session *ksess;
1928
1929 /* Safety net */
1930 assert(session);
1931
1932 usess = session->ust_session;
1933 ksess = session->kernel_session;
1934
1935 /* Clean kernel session teardown */
1936 kernel_destroy_session(ksess);
1937
1938 /* UST session teardown */
1939 if (usess) {
1940 /* Close any relayd session */
1941 consumer_output_send_destroy_relayd(usess->consumer);
1942
1943 /* Destroy every UST application related to this session. */
1944 ret = ust_app_destroy_trace_all(usess);
1945 if (ret) {
1946 ERR("Error in ust_app_destroy_trace_all");
1947 }
1948
1949 /* Clean up the rest. */
1950 trace_ust_destroy_session(usess);
1951 }
1952
1953 /*
1954 * Must notify the kernel thread here to update it's poll set in order to
1955 * remove the channel(s)' fd just destroyed.
1956 */
1957 ret = notify_thread_pipe(wpipe);
1958 if (ret < 0) {
1959 PERROR("write kernel poll pipe");
1960 }
1961
1962 ret = session_destroy(session);
1963
1964 return ret;
1965 }
1966
1967 /*
1968 * Command LTTNG_CALIBRATE processed by the client thread.
1969 */
1970 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1971 {
1972 int ret;
1973
1974 switch (domain) {
1975 case LTTNG_DOMAIN_KERNEL:
1976 {
1977 struct lttng_kernel_calibrate kcalibrate;
1978
1979 kcalibrate.type = calibrate->type;
1980 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1981 if (ret < 0) {
1982 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1983 goto error;
1984 }
1985 break;
1986 }
1987 case LTTNG_DOMAIN_UST:
1988 {
1989 struct lttng_ust_calibrate ucalibrate;
1990
1991 ucalibrate.type = calibrate->type;
1992 ret = ust_app_calibrate_glb(&ucalibrate);
1993 if (ret < 0) {
1994 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1995 goto error;
1996 }
1997 break;
1998 }
1999 default:
2000 ret = LTTNG_ERR_UND;
2001 goto error;
2002 }
2003
2004 ret = LTTNG_OK;
2005
2006 error:
2007 return ret;
2008 }
2009
2010 /*
2011 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2012 */
2013 int cmd_register_consumer(struct ltt_session *session, int domain,
2014 const char *sock_path, struct consumer_data *cdata)
2015 {
2016 int ret, sock;
2017 struct consumer_socket *socket = NULL;
2018
2019 assert(session);
2020 assert(cdata);
2021 assert(sock_path);
2022
2023 switch (domain) {
2024 case LTTNG_DOMAIN_KERNEL:
2025 {
2026 struct ltt_kernel_session *ksess = session->kernel_session;
2027
2028 assert(ksess);
2029
2030 /* Can't register a consumer if there is already one */
2031 if (ksess->consumer_fds_sent != 0) {
2032 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2033 goto error;
2034 }
2035
2036 sock = lttcomm_connect_unix_sock(sock_path);
2037 if (sock < 0) {
2038 ret = LTTNG_ERR_CONNECT_FAIL;
2039 goto error;
2040 }
2041 cdata->cmd_sock = sock;
2042
2043 socket = consumer_allocate_socket(&cdata->cmd_sock);
2044 if (socket == NULL) {
2045 ret = close(sock);
2046 if (ret < 0) {
2047 PERROR("close register consumer");
2048 }
2049 cdata->cmd_sock = -1;
2050 ret = LTTNG_ERR_FATAL;
2051 goto error;
2052 }
2053
2054 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2055 if (socket->lock == NULL) {
2056 PERROR("zmalloc pthread mutex");
2057 ret = LTTNG_ERR_FATAL;
2058 goto error;
2059 }
2060 pthread_mutex_init(socket->lock, NULL);
2061 socket->registered = 1;
2062
2063 rcu_read_lock();
2064 consumer_add_socket(socket, ksess->consumer);
2065 rcu_read_unlock();
2066
2067 pthread_mutex_lock(&cdata->pid_mutex);
2068 cdata->pid = -1;
2069 pthread_mutex_unlock(&cdata->pid_mutex);
2070
2071 break;
2072 }
2073 default:
2074 /* TODO: Userspace tracing */
2075 ret = LTTNG_ERR_UND;
2076 goto error;
2077 }
2078
2079 return LTTNG_OK;
2080
2081 error:
2082 if (socket) {
2083 consumer_destroy_socket(socket);
2084 }
2085 return ret;
2086 }
2087
2088 /*
2089 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2090 */
2091 ssize_t cmd_list_domains(struct ltt_session *session,
2092 struct lttng_domain **domains)
2093 {
2094 int ret, index = 0;
2095 ssize_t nb_dom = 0;
2096
2097 if (session->kernel_session != NULL) {
2098 DBG3("Listing domains found kernel domain");
2099 nb_dom++;
2100 }
2101
2102 if (session->ust_session != NULL) {
2103 DBG3("Listing domains found UST global domain");
2104 nb_dom++;
2105 }
2106
2107 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2108 if (*domains == NULL) {
2109 ret = LTTNG_ERR_FATAL;
2110 goto error;
2111 }
2112
2113 if (session->kernel_session != NULL) {
2114 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2115 index++;
2116 }
2117
2118 if (session->ust_session != NULL) {
2119 (*domains)[index].type = LTTNG_DOMAIN_UST;
2120 (*domains)[index].buf_type = session->ust_session->buffer_type;
2121 index++;
2122 }
2123
2124 return nb_dom;
2125
2126 error:
2127 /* Return negative value to differentiate return code */
2128 return -ret;
2129 }
2130
2131
2132 /*
2133 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2134 */
2135 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2136 struct lttng_channel **channels)
2137 {
2138 int ret;
2139 ssize_t nb_chan = 0;
2140
2141 switch (domain) {
2142 case LTTNG_DOMAIN_KERNEL:
2143 if (session->kernel_session != NULL) {
2144 nb_chan = session->kernel_session->channel_count;
2145 }
2146 DBG3("Number of kernel channels %zd", nb_chan);
2147 if (nb_chan <= 0) {
2148 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2149 }
2150 break;
2151 case LTTNG_DOMAIN_UST:
2152 if (session->ust_session != NULL) {
2153 nb_chan = lttng_ht_get_count(
2154 session->ust_session->domain_global.channels);
2155 }
2156 DBG3("Number of UST global channels %zd", nb_chan);
2157 if (nb_chan <= 0) {
2158 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2159 }
2160 break;
2161 default:
2162 *channels = NULL;
2163 ret = LTTNG_ERR_UND;
2164 goto error;
2165 }
2166
2167 if (nb_chan > 0) {
2168 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2169 if (*channels == NULL) {
2170 ret = LTTNG_ERR_FATAL;
2171 goto error;
2172 }
2173
2174 list_lttng_channels(domain, session, *channels);
2175 } else {
2176 *channels = NULL;
2177 /* Ret value was set in the domain switch case */
2178 goto error;
2179 }
2180
2181 return nb_chan;
2182
2183 error:
2184 /* Return negative value to differentiate return code */
2185 return -ret;
2186 }
2187
2188 /*
2189 * Command LTTNG_LIST_EVENTS processed by the client thread.
2190 */
2191 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2192 char *channel_name, struct lttng_event **events)
2193 {
2194 int ret = 0;
2195 ssize_t nb_event = 0;
2196
2197 switch (domain) {
2198 case LTTNG_DOMAIN_KERNEL:
2199 if (session->kernel_session != NULL) {
2200 nb_event = list_lttng_kernel_events(channel_name,
2201 session->kernel_session, events);
2202 }
2203 break;
2204 case LTTNG_DOMAIN_UST:
2205 {
2206 if (session->ust_session != NULL) {
2207 nb_event = list_lttng_ust_global_events(channel_name,
2208 &session->ust_session->domain_global, events);
2209 }
2210 break;
2211 }
2212 default:
2213 ret = LTTNG_ERR_UND;
2214 goto error;
2215 }
2216
2217 return nb_event;
2218
2219 error:
2220 /* Return negative value to differentiate return code */
2221 return -ret;
2222 }
2223
2224 /*
2225 * Using the session list, filled a lttng_session array to send back to the
2226 * client for session listing.
2227 *
2228 * The session list lock MUST be acquired before calling this function. Use
2229 * session_lock_list() and session_unlock_list().
2230 */
2231 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2232 gid_t gid)
2233 {
2234 int ret;
2235 unsigned int i = 0;
2236 struct ltt_session *session;
2237 struct ltt_session_list *list = session_get_list();
2238
2239 DBG("Getting all available session for UID %d GID %d",
2240 uid, gid);
2241 /*
2242 * Iterate over session list and append data after the control struct in
2243 * the buffer.
2244 */
2245 cds_list_for_each_entry(session, &list->head, list) {
2246 /*
2247 * Only list the sessions the user can control.
2248 */
2249 if (!session_access_ok(session, uid, gid)) {
2250 continue;
2251 }
2252
2253 struct ltt_kernel_session *ksess = session->kernel_session;
2254 struct ltt_ust_session *usess = session->ust_session;
2255
2256 if (session->consumer->type == CONSUMER_DST_NET ||
2257 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2258 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2259 ret = build_network_session_path(sessions[i].path,
2260 sizeof(sessions[i].path), session);
2261 } else {
2262 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2263 session->consumer->dst.trace_path);
2264 }
2265 if (ret < 0) {
2266 PERROR("snprintf session path");
2267 continue;
2268 }
2269
2270 strncpy(sessions[i].name, session->name, NAME_MAX);
2271 sessions[i].name[NAME_MAX - 1] = '\0';
2272 sessions[i].enabled = session->enabled;
2273 sessions[i].snapshot_mode = session->snapshot_mode;
2274 i++;
2275 }
2276 }
2277
2278 /*
2279 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2280 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2281 */
2282 int cmd_data_pending(struct ltt_session *session)
2283 {
2284 int ret;
2285 struct ltt_kernel_session *ksess = session->kernel_session;
2286 struct ltt_ust_session *usess = session->ust_session;
2287
2288 assert(session);
2289
2290 /* Session MUST be stopped to ask for data availability. */
2291 if (session->enabled) {
2292 ret = LTTNG_ERR_SESSION_STARTED;
2293 goto error;
2294 }
2295
2296 if (ksess && ksess->consumer) {
2297 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2298 if (ret == 1) {
2299 /* Data is still being extracted for the kernel. */
2300 goto error;
2301 }
2302 }
2303
2304 if (usess && usess->consumer) {
2305 ret = consumer_is_data_pending(usess->id, usess->consumer);
2306 if (ret == 1) {
2307 /* Data is still being extracted for the kernel. */
2308 goto error;
2309 }
2310 }
2311
2312 /* Data is ready to be read by a viewer */
2313 ret = 0;
2314
2315 error:
2316 return ret;
2317 }
2318
2319 /*
2320 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2321 *
2322 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2323 */
2324 int cmd_snapshot_add_output(struct ltt_session *session,
2325 struct lttng_snapshot_output *output, uint32_t *id)
2326 {
2327 int ret;
2328 struct snapshot_output *new_output;
2329
2330 assert(session);
2331 assert(output);
2332
2333 DBG("Cmd snapshot add output for session %s", session->name);
2334
2335 /*
2336 * Permission denied to create an output if the session is not
2337 * set in no output mode.
2338 */
2339 if (session->output_traces) {
2340 ret = LTTNG_ERR_EPERM;
2341 goto error;
2342 }
2343
2344 /* Only one output is allowed until we have the "tee" feature. */
2345 if (session->snapshot.nb_output == 1) {
2346 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2347 goto error;
2348 }
2349
2350 new_output = snapshot_output_alloc();
2351 if (!new_output) {
2352 ret = LTTNG_ERR_NOMEM;
2353 goto error;
2354 }
2355
2356 ret = snapshot_output_init(output->max_size, output->name,
2357 output->ctrl_url, output->data_url, session->consumer, new_output,
2358 &session->snapshot);
2359 if (ret < 0) {
2360 if (ret == -ENOMEM) {
2361 ret = LTTNG_ERR_NOMEM;
2362 } else {
2363 ret = LTTNG_ERR_INVALID;
2364 }
2365 goto free_error;
2366 }
2367
2368 rcu_read_lock();
2369 snapshot_add_output(&session->snapshot, new_output);
2370 if (id) {
2371 *id = new_output->id;
2372 }
2373 rcu_read_unlock();
2374
2375 return LTTNG_OK;
2376
2377 free_error:
2378 snapshot_output_destroy(new_output);
2379 error:
2380 return ret;
2381 }
2382
2383 /*
2384 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2385 *
2386 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2387 */
2388 int cmd_snapshot_del_output(struct ltt_session *session,
2389 struct lttng_snapshot_output *output)
2390 {
2391 int ret;
2392 struct snapshot_output *sout = NULL;
2393
2394 assert(session);
2395 assert(output);
2396
2397 rcu_read_lock();
2398
2399 /*
2400 * Permission denied to create an output if the session is not
2401 * set in no output mode.
2402 */
2403 if (session->output_traces) {
2404 ret = LTTNG_ERR_EPERM;
2405 goto error;
2406 }
2407
2408 if (output->id) {
2409 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2410 session->name);
2411 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2412 } else if (*output->name != '\0') {
2413 DBG("Cmd snapshot del output name %s for session %s", output->name,
2414 session->name);
2415 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2416 }
2417 if (!sout) {
2418 ret = LTTNG_ERR_INVALID;
2419 goto error;
2420 }
2421
2422 snapshot_delete_output(&session->snapshot, sout);
2423 snapshot_output_destroy(sout);
2424 ret = LTTNG_OK;
2425
2426 error:
2427 rcu_read_unlock();
2428 return ret;
2429 }
2430
2431 /*
2432 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2433 *
2434 * If no output is available, outputs is untouched and 0 is returned.
2435 *
2436 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2437 */
2438 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2439 struct lttng_snapshot_output **outputs)
2440 {
2441 int ret, idx = 0;
2442 struct lttng_snapshot_output *list;
2443 struct lttng_ht_iter iter;
2444 struct snapshot_output *output;
2445
2446 assert(session);
2447 assert(outputs);
2448
2449 DBG("Cmd snapshot list outputs for session %s", session->name);
2450
2451 /*
2452 * Permission denied to create an output if the session is not
2453 * set in no output mode.
2454 */
2455 if (session->output_traces) {
2456 ret = LTTNG_ERR_EPERM;
2457 goto error;
2458 }
2459
2460 if (session->snapshot.nb_output == 0) {
2461 ret = 0;
2462 goto error;
2463 }
2464
2465 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2466 if (!list) {
2467 ret = LTTNG_ERR_NOMEM;
2468 goto error;
2469 }
2470
2471 /* Copy list from session to the new list object. */
2472 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2473 output, node.node) {
2474 assert(output->consumer);
2475 list[idx].id = output->id;
2476 list[idx].max_size = output->max_size;
2477 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2478 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2479 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2480 sizeof(list[idx].ctrl_url));
2481 } else {
2482 /* Control URI. */
2483 ret = uri_to_str_url(&output->consumer->dst.net.control,
2484 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2485 if (ret < 0) {
2486 ret = LTTNG_ERR_NOMEM;
2487 goto free_error;
2488 }
2489
2490 /* Data URI. */
2491 ret = uri_to_str_url(&output->consumer->dst.net.data,
2492 list[idx].data_url, sizeof(list[idx].data_url));
2493 if (ret < 0) {
2494 ret = LTTNG_ERR_NOMEM;
2495 goto free_error;
2496 }
2497 }
2498 idx++;
2499 }
2500
2501 *outputs = list;
2502 return session->snapshot.nb_output;
2503
2504 free_error:
2505 free(list);
2506 error:
2507 return -ret;
2508 }
2509
2510 /*
2511 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2512 * snapshot output is *not* set with a remote destination.
2513 *
2514 * Return 0 on success or a LTTNG_ERR code.
2515 */
2516 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2517 struct snapshot_output *snap_output, struct ltt_session *session)
2518 {
2519 int ret = LTTNG_OK;
2520 struct lttng_ht_iter iter;
2521 struct consumer_socket *socket;
2522
2523 assert(consumer);
2524 assert(snap_output);
2525 assert(session);
2526
2527 DBG2("Set relayd object from snapshot output");
2528
2529 /* Ignore if snapshot consumer output is not network. */
2530 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2531 goto error;
2532 }
2533
2534 /*
2535 * For each consumer socket, create and send the relayd object of the
2536 * snapshot output.
2537 */
2538 rcu_read_lock();
2539 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2540 socket, node.node) {
2541 ret = send_consumer_relayd_sockets(0, session->id,
2542 snap_output->consumer, socket);
2543 if (ret != LTTNG_OK) {
2544 rcu_read_unlock();
2545 goto error;
2546 }
2547 }
2548 rcu_read_unlock();
2549
2550 error:
2551 return ret;
2552 }
2553
2554 /*
2555 * Record a kernel snapshot.
2556 *
2557 * Return 0 on success or a LTTNG_ERR code.
2558 */
2559 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2560 struct snapshot_output *output, struct ltt_session *session,
2561 int wait, int nb_streams)
2562 {
2563 int ret;
2564
2565 assert(ksess);
2566 assert(output);
2567 assert(session);
2568
2569 /* Get the datetime for the snapshot output directory. */
2570 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2571 sizeof(output->datetime));
2572 if (!ret) {
2573 ret = LTTNG_ERR_INVALID;
2574 goto error;
2575 }
2576
2577 /*
2578 * Copy kernel session sockets so we can communicate with the right
2579 * consumer for the snapshot record command.
2580 */
2581 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2582 if (ret < 0) {
2583 ret = LTTNG_ERR_NOMEM;
2584 goto error;
2585 }
2586
2587 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2588 if (ret != LTTNG_OK) {
2589 goto error_snapshot;
2590 }
2591
2592 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2593 if (ret != LTTNG_OK) {
2594 goto error_snapshot;
2595 }
2596
2597 ret = LTTNG_OK;
2598
2599 error_snapshot:
2600 /* Clean up copied sockets so this output can use some other later on. */
2601 consumer_destroy_output_sockets(output->consumer);
2602 error:
2603 return ret;
2604 }
2605
2606 /*
2607 * Record a UST snapshot.
2608 *
2609 * Return 0 on success or a LTTNG_ERR error code.
2610 */
2611 static int record_ust_snapshot(struct ltt_ust_session *usess,
2612 struct snapshot_output *output, struct ltt_session *session,
2613 int wait, int nb_streams)
2614 {
2615 int ret;
2616
2617 assert(usess);
2618 assert(output);
2619 assert(session);
2620
2621 /* Get the datetime for the snapshot output directory. */
2622 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2623 sizeof(output->datetime));
2624 if (!ret) {
2625 ret = LTTNG_ERR_INVALID;
2626 goto error;
2627 }
2628
2629 /*
2630 * Copy UST session sockets so we can communicate with the right
2631 * consumer for the snapshot record command.
2632 */
2633 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2634 if (ret < 0) {
2635 ret = LTTNG_ERR_NOMEM;
2636 goto error;
2637 }
2638
2639 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2640 if (ret != LTTNG_OK) {
2641 goto error_snapshot;
2642 }
2643
2644 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2645 if (ret < 0) {
2646 if (ret == -EINVAL) {
2647 ret = LTTNG_ERR_INVALID;
2648 goto error_snapshot;
2649 }
2650
2651 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2652 goto error_snapshot;
2653 }
2654
2655 ret = LTTNG_OK;
2656
2657 error_snapshot:
2658 /* Clean up copied sockets so this output can use some other later on. */
2659 consumer_destroy_output_sockets(output->consumer);
2660 error:
2661 return ret;
2662 }
2663
2664 /*
2665 * Returns the total number of streams for a session or a negative value
2666 * on error.
2667 */
2668 static unsigned int get_total_nb_stream(struct ltt_session *session)
2669 {
2670 unsigned int total_streams = 0;
2671
2672 if (session->kernel_session) {
2673 struct ltt_kernel_session *ksess = session->kernel_session;
2674
2675 total_streams += ksess->stream_count_global;
2676 }
2677
2678 if (session->ust_session) {
2679 struct ltt_ust_session *usess = session->ust_session;
2680
2681 total_streams += ust_app_get_nb_stream(usess);
2682 }
2683
2684 return total_streams;
2685 }
2686
2687 /*
2688 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2689 *
2690 * The wait parameter is ignored so this call always wait for the snapshot to
2691 * complete before returning.
2692 *
2693 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2694 */
2695 int cmd_snapshot_record(struct ltt_session *session,
2696 struct lttng_snapshot_output *output, int wait)
2697 {
2698 int ret = LTTNG_OK;
2699 unsigned int use_tmp_output = 0;
2700 struct snapshot_output tmp_output;
2701 unsigned int nb_streams, snapshot_success = 0;
2702
2703 assert(session);
2704
2705 DBG("Cmd snapshot record for session %s", session->name);
2706
2707 /*
2708 * Permission denied to create an output if the session is not
2709 * set in no output mode.
2710 */
2711 if (session->output_traces) {
2712 ret = LTTNG_ERR_EPERM;
2713 goto error;
2714 }
2715
2716 /* The session needs to be started at least once. */
2717 if (!session->started) {
2718 ret = LTTNG_ERR_START_SESSION_ONCE;
2719 goto error;
2720 }
2721
2722 /* Use temporary output for the session. */
2723 if (output && *output->ctrl_url != '\0') {
2724 ret = snapshot_output_init(output->max_size, output->name,
2725 output->ctrl_url, output->data_url, session->consumer,
2726 &tmp_output, NULL);
2727 if (ret < 0) {
2728 if (ret == -ENOMEM) {
2729 ret = LTTNG_ERR_NOMEM;
2730 } else {
2731 ret = LTTNG_ERR_INVALID;
2732 }
2733 goto error;
2734 }
2735 /* Use the global session count for the temporary snapshot. */
2736 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2737 use_tmp_output = 1;
2738 }
2739
2740 /*
2741 * Get the total number of stream of that session which is used by the
2742 * maximum size of the snapshot feature.
2743 */
2744 nb_streams = get_total_nb_stream(session);
2745
2746 if (session->kernel_session) {
2747 struct ltt_kernel_session *ksess = session->kernel_session;
2748
2749 if (use_tmp_output) {
2750 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2751 wait, nb_streams);
2752 if (ret != LTTNG_OK) {
2753 goto error;
2754 }
2755 snapshot_success = 1;
2756 } else {
2757 struct snapshot_output *sout;
2758 struct lttng_ht_iter iter;
2759
2760 rcu_read_lock();
2761 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2762 &iter.iter, sout, node.node) {
2763 /*
2764 * Make a local copy of the output and assign the possible
2765 * temporary value given by the caller.
2766 */
2767 memset(&tmp_output, 0, sizeof(tmp_output));
2768 memcpy(&tmp_output, sout, sizeof(tmp_output));
2769
2770 /* Use temporary max size. */
2771 if (output->max_size != (uint64_t) -1ULL) {
2772 tmp_output.max_size = output->max_size;
2773 }
2774
2775 /* Use temporary name. */
2776 if (*output->name != '\0') {
2777 strncpy(tmp_output.name, output->name,
2778 sizeof(tmp_output.name));
2779 }
2780
2781 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2782
2783 ret = record_kernel_snapshot(ksess, &tmp_output,
2784 session, wait, nb_streams);
2785 if (ret != LTTNG_OK) {
2786 rcu_read_unlock();
2787 goto error;
2788 }
2789 snapshot_success = 1;
2790 }
2791 rcu_read_unlock();
2792 }
2793 }
2794
2795 if (session->ust_session) {
2796 struct ltt_ust_session *usess = session->ust_session;
2797
2798 if (use_tmp_output) {
2799 ret = record_ust_snapshot(usess, &tmp_output, session,
2800 wait, nb_streams);
2801 if (ret != LTTNG_OK) {
2802 goto error;
2803 }
2804 snapshot_success = 1;
2805 } else {
2806 struct snapshot_output *sout;
2807 struct lttng_ht_iter iter;
2808
2809 rcu_read_lock();
2810 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2811 &iter.iter, sout, node.node) {
2812 /*
2813 * Make a local copy of the output and assign the possible
2814 * temporary value given by the caller.
2815 */
2816 memset(&tmp_output, 0, sizeof(tmp_output));
2817 memcpy(&tmp_output, sout, sizeof(tmp_output));
2818
2819 /* Use temporary max size. */
2820 if (output->max_size != (uint64_t) -1ULL) {
2821 tmp_output.max_size = output->max_size;
2822 }
2823
2824 /* Use temporary name. */
2825 if (*output->name != '\0') {
2826 strncpy(tmp_output.name, output->name,
2827 sizeof(tmp_output.name));
2828 }
2829
2830 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2831
2832 ret = record_ust_snapshot(usess, &tmp_output, session,
2833 wait, nb_streams);
2834 if (ret != LTTNG_OK) {
2835 rcu_read_unlock();
2836 goto error;
2837 }
2838 snapshot_success = 1;
2839 }
2840 rcu_read_unlock();
2841 }
2842 }
2843
2844 if (snapshot_success) {
2845 session->snapshot.nb_snapshot++;
2846 } else {
2847 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2848 }
2849
2850 error:
2851 return ret;
2852 }
2853
2854 /*
2855 * Init command subsystem.
2856 */
2857 void cmd_init(void)
2858 {
2859 /*
2860 * Set network sequence index to 1 for streams to match a relayd
2861 * socket on the consumer side.
2862 */
2863 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2864 relayd_net_seq_idx = 1;
2865 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2866
2867 DBG("Command subsystem initialized");
2868 }
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