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Fix: Don't report an error when listing a session with no channels
[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-sessiond.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38 #include "syscall.h"
39
40 #include "cmd.h"
41
42 /*
43 * Used to keep a unique index for each relayd socket created where this value
44 * is associated with streams on the consumer so it can match the right relayd
45 * to send to. It must be accessed with the relayd_net_seq_idx_lock
46 * held.
47 */
48 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
49 static uint64_t relayd_net_seq_idx;
50
51 /*
52 * Both functions below are special case for the Kernel domain when
53 * enabling/disabling all events.
54 */
55 static
56 int enable_kevent_all(struct ltt_session *session,
57 struct lttng_domain *domain, char *channel_name,
58 struct lttng_event *event,
59 char *filter_expression,
60 struct lttng_filter_bytecode *filter, int wpipe);
61 static
62 int disable_kevent_all(struct ltt_session *session, int domain,
63 char *channel_name,
64 struct lttng_event *event);
65
66 /*
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
69 */
70 static int build_network_session_path(char *dst, size_t size,
71 struct ltt_session *session)
72 {
73 int ret, kdata_port, udata_port;
74 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
75 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
76
77 assert(session);
78 assert(dst);
79
80 memset(tmp_urls, 0, sizeof(tmp_urls));
81 memset(tmp_uurl, 0, sizeof(tmp_uurl));
82
83 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
84
85 if (session->kernel_session && session->kernel_session->consumer) {
86 kuri = &session->kernel_session->consumer->dst.net.control;
87 kdata_port = session->kernel_session->consumer->dst.net.data.port;
88 }
89
90 if (session->ust_session && session->ust_session->consumer) {
91 uuri = &session->ust_session->consumer->dst.net.control;
92 udata_port = session->ust_session->consumer->dst.net.data.port;
93 }
94
95 if (uuri == NULL && kuri == NULL) {
96 uri = &session->consumer->dst.net.control;
97 kdata_port = session->consumer->dst.net.data.port;
98 } else if (kuri && uuri) {
99 ret = uri_compare(kuri, uuri);
100 if (ret) {
101 /* Not Equal */
102 uri = kuri;
103 /* Build uuri URL string */
104 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
105 if (ret < 0) {
106 goto error;
107 }
108 } else {
109 uri = kuri;
110 }
111 } else if (kuri && uuri == NULL) {
112 uri = kuri;
113 } else if (uuri && kuri == NULL) {
114 uri = uuri;
115 }
116
117 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
118 if (ret < 0) {
119 goto error;
120 }
121
122 /*
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 * to print.
125 */
126 if (*tmp_uurl != '\0') {
127 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls, kdata_port, tmp_uurl, udata_port);
129 } else {
130 int dport;
131 if (kuri || (!kuri && !uuri)) {
132 dport = kdata_port;
133 } else {
134 /* No kernel URI, use the UST port. */
135 dport = udata_port;
136 }
137 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
138 }
139
140 error:
141 return ret;
142 }
143
144 /*
145 * Fill lttng_channel array of all channels.
146 */
147 static void list_lttng_channels(int domain, struct ltt_session *session,
148 struct lttng_channel *channels)
149 {
150 int i = 0;
151 struct ltt_kernel_channel *kchan;
152
153 DBG("Listing channels for session %s", session->name);
154
155 switch (domain) {
156 case LTTNG_DOMAIN_KERNEL:
157 /* Kernel channels */
158 if (session->kernel_session != NULL) {
159 cds_list_for_each_entry(kchan,
160 &session->kernel_session->channel_list.head, list) {
161 /* Copy lttng_channel struct to array */
162 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
163 channels[i].enabled = kchan->enabled;
164 i++;
165 }
166 }
167 break;
168 case LTTNG_DOMAIN_UST:
169 {
170 struct lttng_ht_iter iter;
171 struct ltt_ust_channel *uchan;
172
173 rcu_read_lock();
174 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
175 &iter.iter, uchan, node.node) {
176 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
177 channels[i].attr.overwrite = uchan->attr.overwrite;
178 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
179 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
180 channels[i].attr.switch_timer_interval =
181 uchan->attr.switch_timer_interval;
182 channels[i].attr.read_timer_interval =
183 uchan->attr.read_timer_interval;
184 channels[i].enabled = uchan->enabled;
185 channels[i].attr.tracefile_size = uchan->tracefile_size;
186 channels[i].attr.tracefile_count = uchan->tracefile_count;
187 switch (uchan->attr.output) {
188 case LTTNG_UST_MMAP:
189 default:
190 channels[i].attr.output = LTTNG_EVENT_MMAP;
191 break;
192 }
193 i++;
194 }
195 rcu_read_unlock();
196 break;
197 }
198 default:
199 break;
200 }
201 }
202
203 /*
204 * Create a list of agent domain events.
205 *
206 * Return number of events in list on success or else a negative value.
207 */
208 static int list_lttng_agent_events(struct agent *agt,
209 struct lttng_event **events)
210 {
211 int i = 0, ret = 0;
212 unsigned int nb_event = 0;
213 struct agent_event *event;
214 struct lttng_event *tmp_events;
215 struct lttng_ht_iter iter;
216
217 assert(agt);
218 assert(events);
219
220 DBG3("Listing agent events");
221
222 nb_event = lttng_ht_get_count(agt->events);
223 if (nb_event == 0) {
224 ret = nb_event;
225 goto error;
226 }
227
228 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
229 if (!tmp_events) {
230 PERROR("zmalloc agent events session");
231 ret = -LTTNG_ERR_FATAL;
232 goto error;
233 }
234
235 rcu_read_lock();
236 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
237 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
238 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
239 tmp_events[i].enabled = event->enabled;
240 tmp_events[i].loglevel = event->loglevel;
241 tmp_events[i].loglevel_type = event->loglevel_type;
242 i++;
243 }
244 rcu_read_unlock();
245
246 *events = tmp_events;
247 ret = nb_event;
248
249 error:
250 assert(nb_event == i);
251 return ret;
252 }
253
254 /*
255 * Create a list of ust global domain events.
256 */
257 static int list_lttng_ust_global_events(char *channel_name,
258 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
259 {
260 int i = 0, ret = 0;
261 unsigned int nb_event = 0;
262 struct lttng_ht_iter iter;
263 struct lttng_ht_node_str *node;
264 struct ltt_ust_channel *uchan;
265 struct ltt_ust_event *uevent;
266 struct lttng_event *tmp;
267
268 DBG("Listing UST global events for channel %s", channel_name);
269
270 rcu_read_lock();
271
272 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
273 node = lttng_ht_iter_get_node_str(&iter);
274 if (node == NULL) {
275 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
276 goto error;
277 }
278
279 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
280
281 nb_event += lttng_ht_get_count(uchan->events);
282
283 if (nb_event == 0) {
284 ret = nb_event;
285 goto error;
286 }
287
288 DBG3("Listing UST global %d events", nb_event);
289
290 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
291 if (tmp == NULL) {
292 ret = LTTNG_ERR_FATAL;
293 goto error;
294 }
295
296 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
297 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
298 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
299 tmp[i].enabled = uevent->enabled;
300
301 switch (uevent->attr.instrumentation) {
302 case LTTNG_UST_TRACEPOINT:
303 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
304 break;
305 case LTTNG_UST_PROBE:
306 tmp[i].type = LTTNG_EVENT_PROBE;
307 break;
308 case LTTNG_UST_FUNCTION:
309 tmp[i].type = LTTNG_EVENT_FUNCTION;
310 break;
311 }
312
313 tmp[i].loglevel = uevent->attr.loglevel;
314 switch (uevent->attr.loglevel_type) {
315 case LTTNG_UST_LOGLEVEL_ALL:
316 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
317 break;
318 case LTTNG_UST_LOGLEVEL_RANGE:
319 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
320 break;
321 case LTTNG_UST_LOGLEVEL_SINGLE:
322 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
323 break;
324 }
325 if (uevent->filter) {
326 tmp[i].filter = 1;
327 }
328 if (uevent->exclusion) {
329 tmp[i].exclusion = 1;
330 }
331 i++;
332 }
333
334 ret = nb_event;
335 *events = tmp;
336
337 error:
338 rcu_read_unlock();
339 return ret;
340 }
341
342 /*
343 * Fill lttng_event array of all kernel events in the channel.
344 */
345 static int list_lttng_kernel_events(char *channel_name,
346 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
347 {
348 int i = 0, ret;
349 unsigned int nb_event;
350 struct ltt_kernel_event *event;
351 struct ltt_kernel_channel *kchan;
352
353 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
354 if (kchan == NULL) {
355 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
356 goto error;
357 }
358
359 nb_event = kchan->event_count;
360
361 DBG("Listing events for channel %s", kchan->channel->name);
362
363 if (nb_event == 0) {
364 *events = NULL;
365 goto syscall;
366 }
367
368 *events = zmalloc(nb_event * sizeof(struct lttng_event));
369 if (*events == NULL) {
370 ret = LTTNG_ERR_FATAL;
371 goto error;
372 }
373
374 /* Kernel channels */
375 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
376 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
377 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
378 (*events)[i].enabled = event->enabled;
379
380 switch (event->event->instrumentation) {
381 case LTTNG_KERNEL_TRACEPOINT:
382 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
383 break;
384 case LTTNG_KERNEL_KRETPROBE:
385 (*events)[i].type = LTTNG_EVENT_FUNCTION;
386 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
387 sizeof(struct lttng_kernel_kprobe));
388 break;
389 case LTTNG_KERNEL_KPROBE:
390 (*events)[i].type = LTTNG_EVENT_PROBE;
391 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
392 sizeof(struct lttng_kernel_kprobe));
393 break;
394 case LTTNG_KERNEL_FUNCTION:
395 (*events)[i].type = LTTNG_EVENT_FUNCTION;
396 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
397 sizeof(struct lttng_kernel_function));
398 break;
399 case LTTNG_KERNEL_NOOP:
400 (*events)[i].type = LTTNG_EVENT_NOOP;
401 break;
402 case LTTNG_KERNEL_SYSCALL:
403 (*events)[i].type = LTTNG_EVENT_SYSCALL;
404 break;
405 case LTTNG_KERNEL_ALL:
406 assert(0);
407 break;
408 }
409 i++;
410 }
411
412 syscall:
413 if (syscall_table) {
414 ssize_t new_size;
415
416 new_size = syscall_list_channel(kchan, events, nb_event);
417 if (new_size < 0) {
418 free(events);
419 ret = -new_size;
420 goto error;
421 }
422 nb_event = new_size;
423 }
424
425 return nb_event;
426
427 error:
428 /* Negate the error code to differentiate the size from an error */
429 return -ret;
430 }
431
432 /*
433 * Add URI so the consumer output object. Set the correct path depending on the
434 * domain adding the default trace directory.
435 */
436 static int add_uri_to_consumer(struct consumer_output *consumer,
437 struct lttng_uri *uri, int domain, const char *session_name)
438 {
439 int ret = LTTNG_OK;
440 const char *default_trace_dir;
441
442 assert(uri);
443
444 if (consumer == NULL) {
445 DBG("No consumer detected. Don't add URI. Stopping.");
446 ret = LTTNG_ERR_NO_CONSUMER;
447 goto error;
448 }
449
450 switch (domain) {
451 case LTTNG_DOMAIN_KERNEL:
452 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
453 break;
454 case LTTNG_DOMAIN_UST:
455 default_trace_dir = DEFAULT_UST_TRACE_DIR;
456 break;
457 default:
458 /*
459 * This case is possible is we try to add the URI to the global tracing
460 * session consumer object which in this case there is no subdir.
461 */
462 default_trace_dir = "";
463 }
464
465 switch (uri->dtype) {
466 case LTTNG_DST_IPV4:
467 case LTTNG_DST_IPV6:
468 DBG2("Setting network URI to consumer");
469
470 if (consumer->type == CONSUMER_DST_NET) {
471 if ((uri->stype == LTTNG_STREAM_CONTROL &&
472 consumer->dst.net.control_isset) ||
473 (uri->stype == LTTNG_STREAM_DATA &&
474 consumer->dst.net.data_isset)) {
475 ret = LTTNG_ERR_URL_EXIST;
476 goto error;
477 }
478 } else {
479 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
480 }
481
482 consumer->type = CONSUMER_DST_NET;
483
484 /* Set URI into consumer output object */
485 ret = consumer_set_network_uri(consumer, uri);
486 if (ret < 0) {
487 ret = -ret;
488 goto error;
489 } else if (ret == 1) {
490 /*
491 * URI was the same in the consumer so we do not append the subdir
492 * again so to not duplicate output dir.
493 */
494 ret = LTTNG_OK;
495 goto error;
496 }
497
498 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
499 ret = consumer_set_subdir(consumer, session_name);
500 if (ret < 0) {
501 ret = LTTNG_ERR_FATAL;
502 goto error;
503 }
504 }
505
506 if (uri->stype == LTTNG_STREAM_CONTROL) {
507 /* On a new subdir, reappend the default trace dir. */
508 strncat(consumer->subdir, default_trace_dir,
509 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
510 DBG3("Append domain trace name to subdir %s", consumer->subdir);
511 }
512
513 break;
514 case LTTNG_DST_PATH:
515 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
516 memset(consumer->dst.trace_path, 0,
517 sizeof(consumer->dst.trace_path));
518 strncpy(consumer->dst.trace_path, uri->dst.path,
519 sizeof(consumer->dst.trace_path));
520 /* Append default trace dir */
521 strncat(consumer->dst.trace_path, default_trace_dir,
522 sizeof(consumer->dst.trace_path) -
523 strlen(consumer->dst.trace_path) - 1);
524 /* Flag consumer as local. */
525 consumer->type = CONSUMER_DST_LOCAL;
526 break;
527 }
528
529 ret = LTTNG_OK;
530
531 error:
532 return ret;
533 }
534
535 /*
536 * Init tracing by creating trace directory and sending fds kernel consumer.
537 */
538 static int init_kernel_tracing(struct ltt_kernel_session *session)
539 {
540 int ret = 0;
541 struct lttng_ht_iter iter;
542 struct consumer_socket *socket;
543
544 assert(session);
545
546 rcu_read_lock();
547
548 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
549 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
550 socket, node.node) {
551 pthread_mutex_lock(socket->lock);
552 ret = kernel_consumer_send_session(socket, session);
553 pthread_mutex_unlock(socket->lock);
554 if (ret < 0) {
555 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
556 goto error;
557 }
558 }
559 }
560
561 error:
562 rcu_read_unlock();
563 return ret;
564 }
565
566 /*
567 * Create a socket to the relayd using the URI.
568 *
569 * On success, the relayd_sock pointer is set to the created socket.
570 * Else, it's stays untouched and a lttcomm error code is returned.
571 */
572 static int create_connect_relayd(struct lttng_uri *uri,
573 struct lttcomm_relayd_sock **relayd_sock)
574 {
575 int ret;
576 struct lttcomm_relayd_sock *rsock;
577
578 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
579 RELAYD_VERSION_COMM_MINOR);
580 if (!rsock) {
581 ret = LTTNG_ERR_FATAL;
582 goto error;
583 }
584
585 /*
586 * Connect to relayd so we can proceed with a session creation. This call
587 * can possibly block for an arbitrary amount of time to set the health
588 * state to be in poll execution.
589 */
590 health_poll_entry();
591 ret = relayd_connect(rsock);
592 health_poll_exit();
593 if (ret < 0) {
594 ERR("Unable to reach lttng-relayd");
595 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
596 goto free_sock;
597 }
598
599 /* Create socket for control stream. */
600 if (uri->stype == LTTNG_STREAM_CONTROL) {
601 DBG3("Creating relayd stream socket from URI");
602
603 /* Check relayd version */
604 ret = relayd_version_check(rsock);
605 if (ret < 0) {
606 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
607 goto close_sock;
608 }
609 } else if (uri->stype == LTTNG_STREAM_DATA) {
610 DBG3("Creating relayd data socket from URI");
611 } else {
612 /* Command is not valid */
613 ERR("Relayd invalid stream type: %d", uri->stype);
614 ret = LTTNG_ERR_INVALID;
615 goto close_sock;
616 }
617
618 *relayd_sock = rsock;
619
620 return LTTNG_OK;
621
622 close_sock:
623 /* The returned value is not useful since we are on an error path. */
624 (void) relayd_close(rsock);
625 free_sock:
626 free(rsock);
627 error:
628 return ret;
629 }
630
631 /*
632 * Connect to the relayd using URI and send the socket to the right consumer.
633 */
634 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
635 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
636 struct consumer_socket *consumer_sock,
637 char *session_name, char *hostname, int session_live_timer)
638 {
639 int ret;
640 struct lttcomm_relayd_sock *rsock = NULL;
641
642 /* Connect to relayd and make version check if uri is the control. */
643 ret = create_connect_relayd(relayd_uri, &rsock);
644 if (ret != LTTNG_OK) {
645 goto error;
646 }
647 assert(rsock);
648
649 /* Set the network sequence index if not set. */
650 if (consumer->net_seq_index == (uint64_t) -1ULL) {
651 pthread_mutex_lock(&relayd_net_seq_idx_lock);
652 /*
653 * Increment net_seq_idx because we are about to transfer the
654 * new relayd socket to the consumer.
655 * Assign unique key so the consumer can match streams.
656 */
657 consumer->net_seq_index = ++relayd_net_seq_idx;
658 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
659 }
660
661 /* Send relayd socket to consumer. */
662 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
663 relayd_uri->stype, session_id,
664 session_name, hostname, session_live_timer);
665 if (ret < 0) {
666 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
667 goto close_sock;
668 }
669
670 /* Flag that the corresponding socket was sent. */
671 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
672 consumer_sock->control_sock_sent = 1;
673 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
674 consumer_sock->data_sock_sent = 1;
675 }
676
677 ret = LTTNG_OK;
678
679 /*
680 * Close socket which was dup on the consumer side. The session daemon does
681 * NOT keep track of the relayd socket(s) once transfer to the consumer.
682 */
683
684 close_sock:
685 (void) relayd_close(rsock);
686 free(rsock);
687
688 error:
689 if (ret != LTTNG_OK) {
690 /*
691 * The consumer output for this session should not be used anymore
692 * since the relayd connection failed thus making any tracing or/and
693 * streaming not usable.
694 */
695 consumer->enabled = 0;
696 }
697 return ret;
698 }
699
700 /*
701 * Send both relayd sockets to a specific consumer and domain. This is a
702 * helper function to facilitate sending the information to the consumer for a
703 * session.
704 */
705 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
706 struct consumer_output *consumer, struct consumer_socket *sock,
707 char *session_name, char *hostname, int session_live_timer)
708 {
709 int ret = LTTNG_OK;
710
711 assert(consumer);
712 assert(sock);
713
714 /* Sending control relayd socket. */
715 if (!sock->control_sock_sent) {
716 ret = send_consumer_relayd_socket(domain, session_id,
717 &consumer->dst.net.control, consumer, sock,
718 session_name, hostname, session_live_timer);
719 if (ret != LTTNG_OK) {
720 goto error;
721 }
722 }
723
724 /* Sending data relayd socket. */
725 if (!sock->data_sock_sent) {
726 ret = send_consumer_relayd_socket(domain, session_id,
727 &consumer->dst.net.data, consumer, sock,
728 session_name, hostname, session_live_timer);
729 if (ret != LTTNG_OK) {
730 goto error;
731 }
732 }
733
734 error:
735 return ret;
736 }
737
738 /*
739 * Setup relayd connections for a tracing session. First creates the socket to
740 * the relayd and send them to the right domain consumer. Consumer type MUST be
741 * network.
742 */
743 int cmd_setup_relayd(struct ltt_session *session)
744 {
745 int ret = LTTNG_OK;
746 struct ltt_ust_session *usess;
747 struct ltt_kernel_session *ksess;
748 struct consumer_socket *socket;
749 struct lttng_ht_iter iter;
750
751 assert(session);
752
753 usess = session->ust_session;
754 ksess = session->kernel_session;
755
756 DBG("Setting relayd for session %s", session->name);
757
758 rcu_read_lock();
759
760 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
761 && usess->consumer->enabled) {
762 /* For each consumer socket, send relayd sockets */
763 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
764 socket, node.node) {
765 pthread_mutex_lock(socket->lock);
766 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
767 usess->consumer, socket,
768 session->name, session->hostname,
769 session->live_timer);
770 pthread_mutex_unlock(socket->lock);
771 if (ret != LTTNG_OK) {
772 goto error;
773 }
774 /* Session is now ready for network streaming. */
775 session->net_handle = 1;
776 }
777 }
778
779 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
780 && ksess->consumer->enabled) {
781 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
782 socket, node.node) {
783 pthread_mutex_lock(socket->lock);
784 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
785 ksess->consumer, socket,
786 session->name, session->hostname,
787 session->live_timer);
788 pthread_mutex_unlock(socket->lock);
789 if (ret != LTTNG_OK) {
790 goto error;
791 }
792 /* Session is now ready for network streaming. */
793 session->net_handle = 1;
794 }
795 }
796
797 error:
798 rcu_read_unlock();
799 return ret;
800 }
801
802 /*
803 * Start a kernel session by opening all necessary streams.
804 */
805 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
806 {
807 int ret;
808 struct ltt_kernel_channel *kchan;
809
810 /* Open kernel metadata */
811 if (ksess->metadata == NULL && ksess->output_traces) {
812 ret = kernel_open_metadata(ksess);
813 if (ret < 0) {
814 ret = LTTNG_ERR_KERN_META_FAIL;
815 goto error;
816 }
817 }
818
819 /* Open kernel metadata stream */
820 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
821 ret = kernel_open_metadata_stream(ksess);
822 if (ret < 0) {
823 ERR("Kernel create metadata stream failed");
824 ret = LTTNG_ERR_KERN_STREAM_FAIL;
825 goto error;
826 }
827 }
828
829 /* For each channel */
830 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
831 if (kchan->stream_count == 0) {
832 ret = kernel_open_channel_stream(kchan);
833 if (ret < 0) {
834 ret = LTTNG_ERR_KERN_STREAM_FAIL;
835 goto error;
836 }
837 /* Update the stream global counter */
838 ksess->stream_count_global += ret;
839 }
840 }
841
842 /* Setup kernel consumer socket and send fds to it */
843 ret = init_kernel_tracing(ksess);
844 if (ret != 0) {
845 ret = LTTNG_ERR_KERN_START_FAIL;
846 goto error;
847 }
848
849 /* This start the kernel tracing */
850 ret = kernel_start_session(ksess);
851 if (ret < 0) {
852 ret = LTTNG_ERR_KERN_START_FAIL;
853 goto error;
854 }
855
856 /* Quiescent wait after starting trace */
857 kernel_wait_quiescent(kernel_tracer_fd);
858
859 ksess->active = 1;
860
861 ret = LTTNG_OK;
862
863 error:
864 return ret;
865 }
866
867 /*
868 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
869 */
870 int cmd_disable_channel(struct ltt_session *session, int domain,
871 char *channel_name)
872 {
873 int ret;
874 struct ltt_ust_session *usess;
875
876 usess = session->ust_session;
877
878 rcu_read_lock();
879
880 switch (domain) {
881 case LTTNG_DOMAIN_KERNEL:
882 {
883 ret = channel_kernel_disable(session->kernel_session,
884 channel_name);
885 if (ret != LTTNG_OK) {
886 goto error;
887 }
888
889 kernel_wait_quiescent(kernel_tracer_fd);
890 break;
891 }
892 case LTTNG_DOMAIN_UST:
893 {
894 struct ltt_ust_channel *uchan;
895 struct lttng_ht *chan_ht;
896
897 chan_ht = usess->domain_global.channels;
898
899 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
900 if (uchan == NULL) {
901 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
902 goto error;
903 }
904
905 ret = channel_ust_disable(usess, uchan);
906 if (ret != LTTNG_OK) {
907 goto error;
908 }
909 break;
910 }
911 #if 0
912 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
913 case LTTNG_DOMAIN_UST_EXEC_NAME:
914 case LTTNG_DOMAIN_UST_PID:
915 #endif
916 default:
917 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
918 goto error;
919 }
920
921 ret = LTTNG_OK;
922
923 error:
924 rcu_read_unlock();
925 return ret;
926 }
927
928 /*
929 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
930 *
931 * The wpipe arguments is used as a notifier for the kernel thread.
932 */
933 int cmd_enable_channel(struct ltt_session *session,
934 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
935 {
936 int ret;
937 struct ltt_ust_session *usess = session->ust_session;
938 struct lttng_ht *chan_ht;
939
940 assert(session);
941 assert(attr);
942 assert(domain);
943
944 DBG("Enabling channel %s for session %s", attr->name, session->name);
945
946 rcu_read_lock();
947
948 /*
949 * Don't try to enable a channel if the session has been started at
950 * some point in time before. The tracer does not allow it.
951 */
952 if (session->has_been_started) {
953 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
954 goto error;
955 }
956
957 /*
958 * If the session is a live session, remove the switch timer, the
959 * live timer does the same thing but sends also synchronisation
960 * beacons for inactive streams.
961 */
962 if (session->live_timer > 0) {
963 attr->attr.live_timer_interval = session->live_timer;
964 attr->attr.switch_timer_interval = 0;
965 }
966
967 /*
968 * The ringbuffer (both in user space and kernel) behave badly in overwrite
969 * mode and with less than 2 subbuf so block it right away and send back an
970 * invalid attribute error.
971 */
972 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
973 ret = LTTNG_ERR_INVALID;
974 goto error;
975 }
976
977 switch (domain->type) {
978 case LTTNG_DOMAIN_KERNEL:
979 {
980 struct ltt_kernel_channel *kchan;
981
982 kchan = trace_kernel_get_channel_by_name(attr->name,
983 session->kernel_session);
984 if (kchan == NULL) {
985 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
986 if (attr->name[0] != '\0') {
987 session->kernel_session->has_non_default_channel = 1;
988 }
989 } else {
990 ret = channel_kernel_enable(session->kernel_session, kchan);
991 }
992
993 if (ret != LTTNG_OK) {
994 goto error;
995 }
996
997 kernel_wait_quiescent(kernel_tracer_fd);
998 break;
999 }
1000 case LTTNG_DOMAIN_UST:
1001 {
1002 struct ltt_ust_channel *uchan;
1003
1004 chan_ht = usess->domain_global.channels;
1005
1006 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1007 if (uchan == NULL) {
1008 ret = channel_ust_create(usess, attr, domain->buf_type);
1009 if (attr->name[0] != '\0') {
1010 usess->has_non_default_channel = 1;
1011 }
1012 } else {
1013 ret = channel_ust_enable(usess, uchan);
1014 }
1015 break;
1016 }
1017 default:
1018 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1019 goto error;
1020 }
1021
1022 error:
1023 rcu_read_unlock();
1024 return ret;
1025 }
1026
1027
1028 /*
1029 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1030 */
1031 int cmd_disable_event(struct ltt_session *session, int domain,
1032 char *channel_name,
1033 struct lttng_event *event)
1034 {
1035 int ret;
1036 char *event_name;
1037
1038 DBG("Disable event command for event \'%s\'", event->name);
1039
1040 event_name = event->name;
1041
1042 if (event->loglevel_type || event->loglevel || event->enabled
1043 || event->pid || event->filter || event->exclusion) {
1044 return LTTNG_ERR_UNK;
1045 }
1046 /* Special handling for kernel domain all events. */
1047 if (domain == LTTNG_DOMAIN_KERNEL && !strcmp(event_name, "*")) {
1048 return disable_kevent_all(session, domain, channel_name, event);
1049 }
1050
1051 rcu_read_lock();
1052
1053 switch (domain) {
1054 case LTTNG_DOMAIN_KERNEL:
1055 {
1056 struct ltt_kernel_channel *kchan;
1057 struct ltt_kernel_session *ksess;
1058
1059 ksess = session->kernel_session;
1060
1061 /*
1062 * If a non-default channel has been created in the
1063 * session, explicitely require that -c chan_name needs
1064 * to be provided.
1065 */
1066 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1067 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1068 goto error;
1069 }
1070
1071 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1072 if (kchan == NULL) {
1073 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1074 goto error;
1075 }
1076
1077 switch (event->type) {
1078 case LTTNG_EVENT_ALL:
1079 case LTTNG_EVENT_TRACEPOINT:
1080 ret = event_kernel_disable_tracepoint(kchan, event_name);
1081 if (ret != LTTNG_OK) {
1082 goto error;
1083 }
1084 break;
1085 case LTTNG_EVENT_SYSCALL:
1086 ret = event_kernel_disable_syscall(kchan, event_name);
1087 if (ret != LTTNG_OK) {
1088 goto error;
1089 }
1090 break;
1091 default:
1092 ret = LTTNG_ERR_UNK;
1093 goto error;
1094 }
1095
1096 kernel_wait_quiescent(kernel_tracer_fd);
1097 break;
1098 }
1099 case LTTNG_DOMAIN_UST:
1100 {
1101 struct ltt_ust_channel *uchan;
1102 struct ltt_ust_session *usess;
1103
1104 usess = session->ust_session;
1105
1106 /*
1107 * If a non-default channel has been created in the
1108 * session, explicitely require that -c chan_name needs
1109 * to be provided.
1110 */
1111 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1112 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1113 goto error;
1114 }
1115
1116 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1117 channel_name);
1118 if (uchan == NULL) {
1119 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1120 goto error;
1121 }
1122
1123 switch (event->type) {
1124 case LTTNG_EVENT_ALL:
1125 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1126 if (ret != LTTNG_OK) {
1127 goto error;
1128 }
1129 break;
1130 default:
1131 ret = LTTNG_ERR_UNK;
1132 goto error;
1133 }
1134
1135 DBG3("Disable UST event %s in channel %s completed", event_name,
1136 channel_name);
1137 break;
1138 }
1139 case LTTNG_DOMAIN_LOG4J:
1140 case LTTNG_DOMAIN_JUL:
1141 case LTTNG_DOMAIN_PYTHON:
1142 {
1143 struct agent *agt;
1144 struct ltt_ust_session *usess = session->ust_session;
1145
1146 assert(usess);
1147
1148 switch (event->type) {
1149 case LTTNG_EVENT_ALL:
1150 break;
1151 default:
1152 ret = LTTNG_ERR_UNK;
1153 goto error;
1154 }
1155
1156 agt = trace_ust_find_agent(usess, domain);
1157 if (!agt) {
1158 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1159 goto error;
1160 }
1161 /* The wild card * means that everything should be disabled. */
1162 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1163 ret = event_agent_disable_all(usess, agt);
1164 } else {
1165 ret = event_agent_disable(usess, agt, event_name);
1166 }
1167 if (ret != LTTNG_OK) {
1168 goto error;
1169 }
1170
1171 break;
1172 }
1173 #if 0
1174 case LTTNG_DOMAIN_UST_EXEC_NAME:
1175 case LTTNG_DOMAIN_UST_PID:
1176 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1177 #endif
1178 default:
1179 ret = LTTNG_ERR_UND;
1180 goto error;
1181 }
1182
1183 ret = LTTNG_OK;
1184
1185 error:
1186 rcu_read_unlock();
1187 return ret;
1188 }
1189
1190 /*
1191 * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
1192 */
1193 static
1194 int disable_kevent_all(struct ltt_session *session, int domain,
1195 char *channel_name,
1196 struct lttng_event *event)
1197 {
1198 int ret;
1199
1200 rcu_read_lock();
1201
1202 switch (domain) {
1203 case LTTNG_DOMAIN_KERNEL:
1204 {
1205 struct ltt_kernel_session *ksess;
1206 struct ltt_kernel_channel *kchan;
1207
1208 ksess = session->kernel_session;
1209
1210 /*
1211 * If a non-default channel has been created in the
1212 * session, explicitely require that -c chan_name needs
1213 * to be provided.
1214 */
1215 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1216 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1217 goto error;
1218 }
1219
1220 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1221 if (kchan == NULL) {
1222 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1223 goto error;
1224 }
1225
1226 switch (event->type) {
1227 case LTTNG_EVENT_ALL:
1228 ret = event_kernel_disable_all(kchan);
1229 if (ret != LTTNG_OK) {
1230 goto error;
1231 }
1232 break;
1233 case LTTNG_EVENT_SYSCALL:
1234 ret = event_kernel_disable_syscall(kchan, "");
1235 if (ret != LTTNG_OK) {
1236 goto error;
1237 }
1238 break;
1239 default:
1240 ret = LTTNG_ERR_UNK;
1241 goto error;
1242 }
1243
1244 kernel_wait_quiescent(kernel_tracer_fd);
1245 break;
1246 }
1247 default:
1248 ret = LTTNG_ERR_UND;
1249 goto error;
1250 }
1251
1252 ret = LTTNG_OK;
1253
1254 error:
1255 rcu_read_unlock();
1256 return ret;
1257 }
1258
1259 /*
1260 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1261 */
1262 int cmd_add_context(struct ltt_session *session, int domain,
1263 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1264 {
1265 int ret, chan_kern_created = 0, chan_ust_created = 0;
1266
1267 switch (domain) {
1268 case LTTNG_DOMAIN_KERNEL:
1269 assert(session->kernel_session);
1270
1271 if (session->kernel_session->channel_count == 0) {
1272 /* Create default channel */
1273 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1274 if (ret != LTTNG_OK) {
1275 goto error;
1276 }
1277 chan_kern_created = 1;
1278 }
1279 /* Add kernel context to kernel tracer */
1280 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1281 if (ret != LTTNG_OK) {
1282 goto error;
1283 }
1284 break;
1285 case LTTNG_DOMAIN_UST:
1286 {
1287 struct ltt_ust_session *usess = session->ust_session;
1288 unsigned int chan_count;
1289
1290 assert(usess);
1291
1292 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1293 if (chan_count == 0) {
1294 struct lttng_channel *attr;
1295 /* Create default channel */
1296 attr = channel_new_default_attr(domain, usess->buffer_type);
1297 if (attr == NULL) {
1298 ret = LTTNG_ERR_FATAL;
1299 goto error;
1300 }
1301
1302 ret = channel_ust_create(usess, attr, usess->buffer_type);
1303 if (ret != LTTNG_OK) {
1304 free(attr);
1305 goto error;
1306 }
1307 free(attr);
1308 chan_ust_created = 1;
1309 }
1310
1311 ret = context_ust_add(usess, domain, ctx, channel_name);
1312 if (ret != LTTNG_OK) {
1313 goto error;
1314 }
1315 break;
1316 }
1317 #if 0
1318 case LTTNG_DOMAIN_UST_EXEC_NAME:
1319 case LTTNG_DOMAIN_UST_PID:
1320 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1321 #endif
1322 default:
1323 ret = LTTNG_ERR_UND;
1324 goto error;
1325 }
1326
1327 return LTTNG_OK;
1328
1329 error:
1330 if (chan_kern_created) {
1331 struct ltt_kernel_channel *kchan =
1332 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1333 session->kernel_session);
1334 /* Created previously, this should NOT fail. */
1335 assert(kchan);
1336 kernel_destroy_channel(kchan);
1337 }
1338
1339 if (chan_ust_created) {
1340 struct ltt_ust_channel *uchan =
1341 trace_ust_find_channel_by_name(
1342 session->ust_session->domain_global.channels,
1343 DEFAULT_CHANNEL_NAME);
1344 /* Created previously, this should NOT fail. */
1345 assert(uchan);
1346 /* Remove from the channel list of the session. */
1347 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1348 uchan);
1349 trace_ust_destroy_channel(uchan);
1350 }
1351 return ret;
1352 }
1353
1354 static int validate_event_name(const char *name)
1355 {
1356 int ret = 0;
1357 const char *c = name;
1358 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1359
1360 /*
1361 * Make sure that unescaped wildcards are only used as the last
1362 * character of the event name.
1363 */
1364 while (c < event_name_end) {
1365 switch (*c) {
1366 case '\0':
1367 goto end;
1368 case '\\':
1369 c++;
1370 break;
1371 case '*':
1372 if ((c + 1) < event_name_end && *(c + 1)) {
1373 /* Wildcard is not the last character */
1374 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1375 goto end;
1376 }
1377 default:
1378 break;
1379 }
1380 c++;
1381 }
1382 end:
1383 return ret;
1384 }
1385
1386 /*
1387 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1388 */
1389 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1390 char *channel_name, struct lttng_event *event,
1391 char *filter_expression,
1392 struct lttng_filter_bytecode *filter,
1393 struct lttng_event_exclusion *exclusion,
1394 int wpipe)
1395 {
1396 int ret, channel_created = 0;
1397 struct lttng_channel *attr;
1398
1399 assert(session);
1400 assert(event);
1401 assert(channel_name);
1402
1403 DBG("Enable event command for event \'%s\'", event->name);
1404
1405 /* Special handling for kernel domain all events. */
1406 if (domain->type == LTTNG_DOMAIN_KERNEL && !strcmp(event->name, "*")) {
1407 return enable_kevent_all(session, domain, channel_name, event,
1408 filter_expression, filter, wpipe);
1409 }
1410
1411 ret = validate_event_name(event->name);
1412 if (ret) {
1413 goto error;
1414 }
1415
1416 rcu_read_lock();
1417
1418 switch (domain->type) {
1419 case LTTNG_DOMAIN_KERNEL:
1420 {
1421 struct ltt_kernel_channel *kchan;
1422
1423 /*
1424 * If a non-default channel has been created in the
1425 * session, explicitely require that -c chan_name needs
1426 * to be provided.
1427 */
1428 if (session->kernel_session->has_non_default_channel
1429 && channel_name[0] == '\0') {
1430 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1431 goto error;
1432 }
1433
1434 kchan = trace_kernel_get_channel_by_name(channel_name,
1435 session->kernel_session);
1436 if (kchan == NULL) {
1437 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1438 LTTNG_BUFFER_GLOBAL);
1439 if (attr == NULL) {
1440 ret = LTTNG_ERR_FATAL;
1441 goto error;
1442 }
1443 strncpy(attr->name, channel_name, sizeof(attr->name));
1444
1445 ret = cmd_enable_channel(session, domain, attr, wpipe);
1446 if (ret != LTTNG_OK) {
1447 free(attr);
1448 goto error;
1449 }
1450 free(attr);
1451
1452 channel_created = 1;
1453 }
1454
1455 /* Get the newly created kernel channel pointer */
1456 kchan = trace_kernel_get_channel_by_name(channel_name,
1457 session->kernel_session);
1458 if (kchan == NULL) {
1459 /* This sould not happen... */
1460 ret = LTTNG_ERR_FATAL;
1461 goto error;
1462 }
1463
1464 switch (event->type) {
1465 case LTTNG_EVENT_ALL:
1466 case LTTNG_EVENT_PROBE:
1467 case LTTNG_EVENT_FUNCTION:
1468 case LTTNG_EVENT_FUNCTION_ENTRY:
1469 case LTTNG_EVENT_TRACEPOINT:
1470 ret = event_kernel_enable_tracepoint(kchan, event);
1471 if (ret != LTTNG_OK) {
1472 if (channel_created) {
1473 /* Let's not leak a useless channel. */
1474 kernel_destroy_channel(kchan);
1475 }
1476 goto error;
1477 }
1478 break;
1479 case LTTNG_EVENT_SYSCALL:
1480 ret = event_kernel_enable_syscall(kchan, event->name);
1481 if (ret != LTTNG_OK) {
1482 goto error;
1483 }
1484 break;
1485 default:
1486 ret = LTTNG_ERR_UNK;
1487 goto error;
1488 }
1489
1490 kernel_wait_quiescent(kernel_tracer_fd);
1491 break;
1492 }
1493 case LTTNG_DOMAIN_UST:
1494 {
1495 struct ltt_ust_channel *uchan;
1496 struct ltt_ust_session *usess = session->ust_session;
1497
1498 assert(usess);
1499
1500 /*
1501 * If a non-default channel has been created in the
1502 * session, explicitely require that -c chan_name needs
1503 * to be provided.
1504 */
1505 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1506 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1507 goto error;
1508 }
1509
1510 /* Get channel from global UST domain */
1511 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1512 channel_name);
1513 if (uchan == NULL) {
1514 /* Create default channel */
1515 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1516 usess->buffer_type);
1517 if (attr == NULL) {
1518 ret = LTTNG_ERR_FATAL;
1519 goto error;
1520 }
1521 strncpy(attr->name, channel_name, sizeof(attr->name));
1522
1523 ret = cmd_enable_channel(session, domain, attr, wpipe);
1524 if (ret != LTTNG_OK) {
1525 free(attr);
1526 goto error;
1527 }
1528 free(attr);
1529
1530 /* Get the newly created channel reference back */
1531 uchan = trace_ust_find_channel_by_name(
1532 usess->domain_global.channels, channel_name);
1533 assert(uchan);
1534 }
1535
1536 /* At this point, the session and channel exist on the tracer */
1537 ret = event_ust_enable_tracepoint(usess, uchan, event,
1538 filter_expression, filter, exclusion);
1539 if (ret != LTTNG_OK) {
1540 goto error;
1541 }
1542 break;
1543 }
1544 case LTTNG_DOMAIN_LOG4J:
1545 case LTTNG_DOMAIN_JUL:
1546 case LTTNG_DOMAIN_PYTHON:
1547 {
1548 const char *default_event_name, *default_chan_name;
1549 struct agent *agt;
1550 struct lttng_event uevent;
1551 struct lttng_domain tmp_dom;
1552 struct ltt_ust_session *usess = session->ust_session;
1553
1554 assert(usess);
1555
1556 agt = trace_ust_find_agent(usess, domain->type);
1557 if (!agt) {
1558 agt = agent_create(domain->type);
1559 if (!agt) {
1560 ret = -LTTNG_ERR_NOMEM;
1561 goto error;
1562 }
1563 agent_add(agt, usess->agents);
1564 }
1565
1566 /* Create the default tracepoint. */
1567 memset(&uevent, 0, sizeof(uevent));
1568 uevent.type = LTTNG_EVENT_TRACEPOINT;
1569 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1570 default_event_name = event_get_default_agent_ust_name(domain->type);
1571 if (!default_event_name) {
1572 ret = -LTTNG_ERR_FATAL;
1573 goto error;
1574 }
1575 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1576 uevent.name[sizeof(uevent.name) - 1] = '\0';
1577
1578 /*
1579 * The domain type is changed because we are about to enable the
1580 * default channel and event for the JUL domain that are hardcoded.
1581 * This happens in the UST domain.
1582 */
1583 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1584 tmp_dom.type = LTTNG_DOMAIN_UST;
1585
1586 switch (domain->type) {
1587 case LTTNG_DOMAIN_LOG4J:
1588 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1589 break;
1590 case LTTNG_DOMAIN_JUL:
1591 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1592 break;
1593 case LTTNG_DOMAIN_PYTHON:
1594 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1595 break;
1596 default:
1597 /* The switch/case we are in should avoid this else big problem */
1598 assert(0);
1599 }
1600
1601 ret = cmd_enable_event(session, &tmp_dom, (char *) default_chan_name,
1602 &uevent, filter_expression, filter, NULL, wpipe);
1603 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1604 goto error;
1605 }
1606
1607 /* The wild card * means that everything should be enabled. */
1608 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1609 ret = event_agent_enable_all(usess, agt, event, filter);
1610 } else {
1611 ret = event_agent_enable(usess, agt, event, filter);
1612 }
1613 if (ret != LTTNG_OK) {
1614 goto error;
1615 }
1616
1617 break;
1618 }
1619 #if 0
1620 case LTTNG_DOMAIN_UST_EXEC_NAME:
1621 case LTTNG_DOMAIN_UST_PID:
1622 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1623 #endif
1624 default:
1625 ret = LTTNG_ERR_UND;
1626 goto error;
1627 }
1628
1629 ret = LTTNG_OK;
1630
1631 error:
1632 rcu_read_unlock();
1633 return ret;
1634 }
1635
1636 /*
1637 * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
1638 */
1639 static
1640 int enable_kevent_all(struct ltt_session *session,
1641 struct lttng_domain *domain, char *channel_name,
1642 struct lttng_event *event,
1643 char *filter_expression,
1644 struct lttng_filter_bytecode *filter, int wpipe)
1645 {
1646 int ret;
1647 struct lttng_channel *attr;
1648
1649 assert(session);
1650 assert(channel_name);
1651
1652 rcu_read_lock();
1653
1654 switch (domain->type) {
1655 case LTTNG_DOMAIN_KERNEL:
1656 {
1657 struct ltt_kernel_channel *kchan;
1658
1659 assert(session->kernel_session);
1660
1661 /*
1662 * If a non-default channel has been created in the
1663 * session, explicitely require that -c chan_name needs
1664 * to be provided.
1665 */
1666 if (session->kernel_session->has_non_default_channel
1667 && channel_name[0] == '\0') {
1668 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1669 goto error;
1670 }
1671
1672 kchan = trace_kernel_get_channel_by_name(channel_name,
1673 session->kernel_session);
1674 if (kchan == NULL) {
1675 /* Create default channel */
1676 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1677 LTTNG_BUFFER_GLOBAL);
1678 if (attr == NULL) {
1679 ret = LTTNG_ERR_FATAL;
1680 goto error;
1681 }
1682 strncpy(attr->name, channel_name, sizeof(attr->name));
1683
1684 ret = cmd_enable_channel(session, domain, attr, wpipe);
1685 if (ret != LTTNG_OK) {
1686 free(attr);
1687 goto error;
1688 }
1689 free(attr);
1690
1691 /* Get the newly created kernel channel pointer */
1692 kchan = trace_kernel_get_channel_by_name(channel_name,
1693 session->kernel_session);
1694 assert(kchan);
1695 }
1696
1697 switch (event->type) {
1698 case LTTNG_EVENT_SYSCALL:
1699 ret = event_kernel_enable_syscall(kchan, "");
1700 if (ret != LTTNG_OK) {
1701 goto error;
1702 }
1703 break;
1704 case LTTNG_EVENT_TRACEPOINT:
1705 /*
1706 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1707 * events already registered to the channel.
1708 */
1709 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1710 break;
1711 case LTTNG_EVENT_ALL:
1712 /* Enable syscalls and tracepoints */
1713 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1714 break;
1715 default:
1716 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1717 goto error;
1718 }
1719
1720 /* Manage return value */
1721 if (ret != LTTNG_OK) {
1722 /*
1723 * On error, cmd_enable_channel call will take care of destroying
1724 * the created channel if it was needed.
1725 */
1726 goto error;
1727 }
1728
1729 kernel_wait_quiescent(kernel_tracer_fd);
1730 break;
1731 }
1732 default:
1733 ret = LTTNG_ERR_UND;
1734 goto error;
1735 }
1736
1737 ret = LTTNG_OK;
1738
1739 error:
1740 rcu_read_unlock();
1741 return ret;
1742 }
1743
1744
1745 /*
1746 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1747 */
1748 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1749 {
1750 int ret;
1751 ssize_t nb_events = 0;
1752
1753 switch (domain) {
1754 case LTTNG_DOMAIN_KERNEL:
1755 nb_events = kernel_list_events(kernel_tracer_fd, events);
1756 if (nb_events < 0) {
1757 ret = LTTNG_ERR_KERN_LIST_FAIL;
1758 goto error;
1759 }
1760 break;
1761 case LTTNG_DOMAIN_UST:
1762 nb_events = ust_app_list_events(events);
1763 if (nb_events < 0) {
1764 ret = LTTNG_ERR_UST_LIST_FAIL;
1765 goto error;
1766 }
1767 break;
1768 case LTTNG_DOMAIN_LOG4J:
1769 case LTTNG_DOMAIN_JUL:
1770 case LTTNG_DOMAIN_PYTHON:
1771 nb_events = agent_list_events(events, domain);
1772 if (nb_events < 0) {
1773 ret = LTTNG_ERR_UST_LIST_FAIL;
1774 goto error;
1775 }
1776 break;
1777 default:
1778 ret = LTTNG_ERR_UND;
1779 goto error;
1780 }
1781
1782 return nb_events;
1783
1784 error:
1785 /* Return negative value to differentiate return code */
1786 return -ret;
1787 }
1788
1789 /*
1790 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1791 */
1792 ssize_t cmd_list_tracepoint_fields(int domain,
1793 struct lttng_event_field **fields)
1794 {
1795 int ret;
1796 ssize_t nb_fields = 0;
1797
1798 switch (domain) {
1799 case LTTNG_DOMAIN_UST:
1800 nb_fields = ust_app_list_event_fields(fields);
1801 if (nb_fields < 0) {
1802 ret = LTTNG_ERR_UST_LIST_FAIL;
1803 goto error;
1804 }
1805 break;
1806 case LTTNG_DOMAIN_KERNEL:
1807 default: /* fall-through */
1808 ret = LTTNG_ERR_UND;
1809 goto error;
1810 }
1811
1812 return nb_fields;
1813
1814 error:
1815 /* Return negative value to differentiate return code */
1816 return -ret;
1817 }
1818
1819 ssize_t cmd_list_syscalls(struct lttng_event **events)
1820 {
1821 return syscall_table_list(events);
1822 }
1823
1824 /*
1825 * Command LTTNG_START_TRACE processed by the client thread.
1826 */
1827 int cmd_start_trace(struct ltt_session *session)
1828 {
1829 int ret;
1830 unsigned long nb_chan = 0;
1831 struct ltt_kernel_session *ksession;
1832 struct ltt_ust_session *usess;
1833
1834 assert(session);
1835
1836 /* Ease our life a bit ;) */
1837 ksession = session->kernel_session;
1838 usess = session->ust_session;
1839
1840 /* Is the session already started? */
1841 if (session->active) {
1842 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1843 goto error;
1844 }
1845
1846 /*
1847 * Starting a session without channel is useless since after that it's not
1848 * possible to enable channel thus inform the client.
1849 */
1850 if (usess && usess->domain_global.channels) {
1851 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1852 }
1853 if (ksession) {
1854 nb_chan += ksession->channel_count;
1855 }
1856 if (!nb_chan) {
1857 ret = LTTNG_ERR_NO_CHANNEL;
1858 goto error;
1859 }
1860
1861 /* Kernel tracing */
1862 if (ksession != NULL) {
1863 ret = start_kernel_session(ksession, kernel_tracer_fd);
1864 if (ret != LTTNG_OK) {
1865 goto error;
1866 }
1867 }
1868
1869 /* Flag session that trace should start automatically */
1870 if (usess) {
1871 /*
1872 * Even though the start trace might fail, flag this session active so
1873 * other application coming in are started by default.
1874 */
1875 usess->active = 1;
1876
1877 ret = ust_app_start_trace_all(usess);
1878 if (ret < 0) {
1879 ret = LTTNG_ERR_UST_START_FAIL;
1880 goto error;
1881 }
1882 }
1883
1884 /* Flag this after a successful start. */
1885 session->has_been_started = 1;
1886 session->active = 1;
1887
1888 ret = LTTNG_OK;
1889
1890 error:
1891 return ret;
1892 }
1893
1894 /*
1895 * Command LTTNG_STOP_TRACE processed by the client thread.
1896 */
1897 int cmd_stop_trace(struct ltt_session *session)
1898 {
1899 int ret;
1900 struct ltt_kernel_channel *kchan;
1901 struct ltt_kernel_session *ksession;
1902 struct ltt_ust_session *usess;
1903
1904 assert(session);
1905
1906 /* Short cut */
1907 ksession = session->kernel_session;
1908 usess = session->ust_session;
1909
1910 /* Session is not active. Skip everythong and inform the client. */
1911 if (!session->active) {
1912 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1913 goto error;
1914 }
1915
1916 /* Kernel tracer */
1917 if (ksession && ksession->active) {
1918 DBG("Stop kernel tracing");
1919
1920 /* Flush metadata if exist */
1921 if (ksession->metadata_stream_fd >= 0) {
1922 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1923 if (ret < 0) {
1924 ERR("Kernel metadata flush failed");
1925 }
1926 }
1927
1928 /* Flush all buffers before stopping */
1929 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1930 ret = kernel_flush_buffer(kchan);
1931 if (ret < 0) {
1932 ERR("Kernel flush buffer error");
1933 }
1934 }
1935
1936 ret = kernel_stop_session(ksession);
1937 if (ret < 0) {
1938 ret = LTTNG_ERR_KERN_STOP_FAIL;
1939 goto error;
1940 }
1941
1942 kernel_wait_quiescent(kernel_tracer_fd);
1943
1944 ksession->active = 0;
1945 }
1946
1947 if (usess && usess->active) {
1948 /*
1949 * Even though the stop trace might fail, flag this session inactive so
1950 * other application coming in are not started by default.
1951 */
1952 usess->active = 0;
1953
1954 ret = ust_app_stop_trace_all(usess);
1955 if (ret < 0) {
1956 ret = LTTNG_ERR_UST_STOP_FAIL;
1957 goto error;
1958 }
1959 }
1960
1961 /* Flag inactive after a successful stop. */
1962 session->active = 0;
1963 ret = LTTNG_OK;
1964
1965 error:
1966 return ret;
1967 }
1968
1969 /*
1970 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1971 */
1972 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1973 size_t nb_uri, struct lttng_uri *uris)
1974 {
1975 int ret, i;
1976 struct ltt_kernel_session *ksess = session->kernel_session;
1977 struct ltt_ust_session *usess = session->ust_session;
1978 struct consumer_output *consumer = NULL;
1979
1980 assert(session);
1981 assert(uris);
1982 assert(nb_uri > 0);
1983
1984 /* Can't set consumer URI if the session is active. */
1985 if (session->active) {
1986 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1987 goto error;
1988 }
1989
1990 /*
1991 * This case switch makes sure the domain session has a temporary consumer
1992 * so the URL can be set.
1993 */
1994 switch (domain) {
1995 case 0:
1996 /* Code flow error. A session MUST always have a consumer object */
1997 assert(session->consumer);
1998 /*
1999 * The URL will be added to the tracing session consumer instead of a
2000 * specific domain consumer.
2001 */
2002 consumer = session->consumer;
2003 break;
2004 case LTTNG_DOMAIN_KERNEL:
2005 /* Code flow error if we don't have a kernel session here. */
2006 assert(ksess);
2007 assert(ksess->consumer);
2008 consumer = ksess->consumer;
2009 break;
2010 case LTTNG_DOMAIN_UST:
2011 /* Code flow error if we don't have a kernel session here. */
2012 assert(usess);
2013 assert(usess->consumer);
2014 consumer = usess->consumer;
2015 break;
2016 }
2017
2018 for (i = 0; i < nb_uri; i++) {
2019 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
2020 if (ret != LTTNG_OK) {
2021 goto error;
2022 }
2023 }
2024
2025 /*
2026 * Make sure to set the session in output mode after we set URI since a
2027 * session can be created without URL (thus flagged in no output mode).
2028 */
2029 session->output_traces = 1;
2030 if (ksess) {
2031 ksess->output_traces = 1;
2032 } else if (usess) {
2033 usess->output_traces = 1;
2034 }
2035
2036 /* All good! */
2037 ret = LTTNG_OK;
2038
2039 error:
2040 return ret;
2041 }
2042
2043 /*
2044 * Command LTTNG_CREATE_SESSION processed by the client thread.
2045 */
2046 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2047 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2048 {
2049 int ret;
2050 struct ltt_session *session;
2051
2052 assert(name);
2053 assert(creds);
2054
2055 /*
2056 * Verify if the session already exist
2057 *
2058 * XXX: There is no need for the session lock list here since the caller
2059 * (process_client_msg) is holding it. We might want to change that so a
2060 * single command does not lock the entire session list.
2061 */
2062 session = session_find_by_name(name);
2063 if (session != NULL) {
2064 ret = LTTNG_ERR_EXIST_SESS;
2065 goto find_error;
2066 }
2067
2068 /* Create tracing session in the registry */
2069 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2070 LTTNG_SOCK_GET_GID_CRED(creds));
2071 if (ret != LTTNG_OK) {
2072 goto session_error;
2073 }
2074
2075 /*
2076 * Get the newly created session pointer back
2077 *
2078 * XXX: There is no need for the session lock list here since the caller
2079 * (process_client_msg) is holding it. We might want to change that so a
2080 * single command does not lock the entire session list.
2081 */
2082 session = session_find_by_name(name);
2083 assert(session);
2084
2085 session->live_timer = live_timer;
2086 /* Create default consumer output for the session not yet created. */
2087 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2088 if (session->consumer == NULL) {
2089 ret = LTTNG_ERR_FATAL;
2090 goto consumer_error;
2091 }
2092
2093 if (uris) {
2094 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2095 if (ret != LTTNG_OK) {
2096 goto consumer_error;
2097 }
2098 session->output_traces = 1;
2099 } else {
2100 session->output_traces = 0;
2101 DBG2("Session %s created with no output", session->name);
2102 }
2103
2104 session->consumer->enabled = 1;
2105
2106 return LTTNG_OK;
2107
2108 consumer_error:
2109 session_destroy(session);
2110 session_error:
2111 find_error:
2112 return ret;
2113 }
2114
2115 /*
2116 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2117 */
2118 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2119 size_t nb_uri, lttng_sock_cred *creds)
2120 {
2121 int ret;
2122 struct ltt_session *session;
2123 struct snapshot_output *new_output = NULL;
2124
2125 assert(name);
2126 assert(creds);
2127
2128 /*
2129 * Create session in no output mode with URIs set to NULL. The uris we've
2130 * received are for a default snapshot output if one.
2131 */
2132 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2133 if (ret != LTTNG_OK) {
2134 goto error;
2135 }
2136
2137 /* Get the newly created session pointer back. This should NEVER fail. */
2138 session = session_find_by_name(name);
2139 assert(session);
2140
2141 /* Flag session for snapshot mode. */
2142 session->snapshot_mode = 1;
2143
2144 /* Skip snapshot output creation if no URI is given. */
2145 if (nb_uri == 0) {
2146 goto end;
2147 }
2148
2149 new_output = snapshot_output_alloc();
2150 if (!new_output) {
2151 ret = LTTNG_ERR_NOMEM;
2152 goto error_snapshot_alloc;
2153 }
2154
2155 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2156 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2157 if (ret < 0) {
2158 if (ret == -ENOMEM) {
2159 ret = LTTNG_ERR_NOMEM;
2160 } else {
2161 ret = LTTNG_ERR_INVALID;
2162 }
2163 goto error_snapshot;
2164 }
2165
2166 rcu_read_lock();
2167 snapshot_add_output(&session->snapshot, new_output);
2168 rcu_read_unlock();
2169
2170 end:
2171 return LTTNG_OK;
2172
2173 error_snapshot:
2174 snapshot_output_destroy(new_output);
2175 error_snapshot_alloc:
2176 session_destroy(session);
2177 error:
2178 return ret;
2179 }
2180
2181 /*
2182 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2183 */
2184 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2185 {
2186 int ret;
2187 struct ltt_ust_session *usess;
2188 struct ltt_kernel_session *ksess;
2189
2190 /* Safety net */
2191 assert(session);
2192
2193 usess = session->ust_session;
2194 ksess = session->kernel_session;
2195
2196 /* Clean kernel session teardown */
2197 kernel_destroy_session(ksess);
2198
2199 /* UST session teardown */
2200 if (usess) {
2201 /* Close any relayd session */
2202 consumer_output_send_destroy_relayd(usess->consumer);
2203
2204 /* Destroy every UST application related to this session. */
2205 ret = ust_app_destroy_trace_all(usess);
2206 if (ret) {
2207 ERR("Error in ust_app_destroy_trace_all");
2208 }
2209
2210 /* Clean up the rest. */
2211 trace_ust_destroy_session(usess);
2212 }
2213
2214 /*
2215 * Must notify the kernel thread here to update it's poll set in order to
2216 * remove the channel(s)' fd just destroyed.
2217 */
2218 ret = notify_thread_pipe(wpipe);
2219 if (ret < 0) {
2220 PERROR("write kernel poll pipe");
2221 }
2222
2223 ret = session_destroy(session);
2224
2225 return ret;
2226 }
2227
2228 /*
2229 * Command LTTNG_CALIBRATE processed by the client thread.
2230 */
2231 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2232 {
2233 int ret;
2234
2235 switch (domain) {
2236 case LTTNG_DOMAIN_KERNEL:
2237 {
2238 struct lttng_kernel_calibrate kcalibrate;
2239
2240 switch (calibrate->type) {
2241 case LTTNG_CALIBRATE_FUNCTION:
2242 default:
2243 /* Default and only possible calibrate option. */
2244 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2245 break;
2246 }
2247
2248 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2249 if (ret < 0) {
2250 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2251 goto error;
2252 }
2253 break;
2254 }
2255 case LTTNG_DOMAIN_UST:
2256 {
2257 struct lttng_ust_calibrate ucalibrate;
2258
2259 switch (calibrate->type) {
2260 case LTTNG_CALIBRATE_FUNCTION:
2261 default:
2262 /* Default and only possible calibrate option. */
2263 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2264 break;
2265 }
2266
2267 ret = ust_app_calibrate_glb(&ucalibrate);
2268 if (ret < 0) {
2269 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2270 goto error;
2271 }
2272 break;
2273 }
2274 default:
2275 ret = LTTNG_ERR_UND;
2276 goto error;
2277 }
2278
2279 ret = LTTNG_OK;
2280
2281 error:
2282 return ret;
2283 }
2284
2285 /*
2286 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2287 */
2288 int cmd_register_consumer(struct ltt_session *session, int domain,
2289 const char *sock_path, struct consumer_data *cdata)
2290 {
2291 int ret, sock;
2292 struct consumer_socket *socket = NULL;
2293
2294 assert(session);
2295 assert(cdata);
2296 assert(sock_path);
2297
2298 switch (domain) {
2299 case LTTNG_DOMAIN_KERNEL:
2300 {
2301 struct ltt_kernel_session *ksess = session->kernel_session;
2302
2303 assert(ksess);
2304
2305 /* Can't register a consumer if there is already one */
2306 if (ksess->consumer_fds_sent != 0) {
2307 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2308 goto error;
2309 }
2310
2311 sock = lttcomm_connect_unix_sock(sock_path);
2312 if (sock < 0) {
2313 ret = LTTNG_ERR_CONNECT_FAIL;
2314 goto error;
2315 }
2316 cdata->cmd_sock = sock;
2317
2318 socket = consumer_allocate_socket(&cdata->cmd_sock);
2319 if (socket == NULL) {
2320 ret = close(sock);
2321 if (ret < 0) {
2322 PERROR("close register consumer");
2323 }
2324 cdata->cmd_sock = -1;
2325 ret = LTTNG_ERR_FATAL;
2326 goto error;
2327 }
2328
2329 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2330 if (socket->lock == NULL) {
2331 PERROR("zmalloc pthread mutex");
2332 ret = LTTNG_ERR_FATAL;
2333 goto error;
2334 }
2335 pthread_mutex_init(socket->lock, NULL);
2336 socket->registered = 1;
2337
2338 rcu_read_lock();
2339 consumer_add_socket(socket, ksess->consumer);
2340 rcu_read_unlock();
2341
2342 pthread_mutex_lock(&cdata->pid_mutex);
2343 cdata->pid = -1;
2344 pthread_mutex_unlock(&cdata->pid_mutex);
2345
2346 break;
2347 }
2348 default:
2349 /* TODO: Userspace tracing */
2350 ret = LTTNG_ERR_UND;
2351 goto error;
2352 }
2353
2354 return LTTNG_OK;
2355
2356 error:
2357 if (socket) {
2358 consumer_destroy_socket(socket);
2359 }
2360 return ret;
2361 }
2362
2363 /*
2364 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2365 */
2366 ssize_t cmd_list_domains(struct ltt_session *session,
2367 struct lttng_domain **domains)
2368 {
2369 int ret, index = 0;
2370 ssize_t nb_dom = 0;
2371 struct agent *agt;
2372 struct lttng_ht_iter iter;
2373
2374 if (session->kernel_session != NULL) {
2375 DBG3("Listing domains found kernel domain");
2376 nb_dom++;
2377 }
2378
2379 if (session->ust_session != NULL) {
2380 DBG3("Listing domains found UST global domain");
2381 nb_dom++;
2382
2383 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2384 agt, node.node) {
2385 if (agt->being_used) {
2386 nb_dom++;
2387 }
2388 }
2389 }
2390
2391 if (!nb_dom) {
2392 goto end;
2393 }
2394
2395 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2396 if (*domains == NULL) {
2397 ret = LTTNG_ERR_FATAL;
2398 goto error;
2399 }
2400
2401 if (session->kernel_session != NULL) {
2402 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2403 index++;
2404 }
2405
2406 if (session->ust_session != NULL) {
2407 (*domains)[index].type = LTTNG_DOMAIN_UST;
2408 (*domains)[index].buf_type = session->ust_session->buffer_type;
2409 index++;
2410
2411 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2412 agt, node.node) {
2413 if (agt->being_used) {
2414 (*domains)[index].type = agt->domain;
2415 (*domains)[index].buf_type = session->ust_session->buffer_type;
2416 index++;
2417 }
2418 }
2419 }
2420 end:
2421 return nb_dom;
2422
2423 error:
2424 /* Return negative value to differentiate return code */
2425 return -ret;
2426 }
2427
2428
2429 /*
2430 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2431 */
2432 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2433 struct lttng_channel **channels)
2434 {
2435 int ret;
2436 ssize_t nb_chan = 0;
2437
2438 switch (domain) {
2439 case LTTNG_DOMAIN_KERNEL:
2440 if (session->kernel_session != NULL) {
2441 nb_chan = session->kernel_session->channel_count;
2442 }
2443 DBG3("Number of kernel channels %zd", nb_chan);
2444 if (nb_chan <= 0) {
2445 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2446 }
2447 break;
2448 case LTTNG_DOMAIN_UST:
2449 if (session->ust_session != NULL) {
2450 nb_chan = lttng_ht_get_count(
2451 session->ust_session->domain_global.channels);
2452 }
2453 DBG3("Number of UST global channels %zd", nb_chan);
2454 if (nb_chan < 0) {
2455 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2456 goto error;
2457 }
2458 break;
2459 default:
2460 ret = LTTNG_ERR_UND;
2461 goto error;
2462 }
2463
2464 if (nb_chan > 0) {
2465 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2466 if (*channels == NULL) {
2467 ret = LTTNG_ERR_FATAL;
2468 goto error;
2469 }
2470
2471 list_lttng_channels(domain, session, *channels);
2472 }
2473
2474 return nb_chan;
2475
2476 error:
2477 /* Return negative value to differentiate return code */
2478 return -ret;
2479 }
2480
2481 /*
2482 * Command LTTNG_LIST_EVENTS processed by the client thread.
2483 */
2484 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2485 char *channel_name, struct lttng_event **events)
2486 {
2487 int ret = 0;
2488 ssize_t nb_event = 0;
2489
2490 switch (domain) {
2491 case LTTNG_DOMAIN_KERNEL:
2492 if (session->kernel_session != NULL) {
2493 nb_event = list_lttng_kernel_events(channel_name,
2494 session->kernel_session, events);
2495 }
2496 break;
2497 case LTTNG_DOMAIN_UST:
2498 {
2499 if (session->ust_session != NULL) {
2500 nb_event = list_lttng_ust_global_events(channel_name,
2501 &session->ust_session->domain_global, events);
2502 }
2503 break;
2504 }
2505 case LTTNG_DOMAIN_LOG4J:
2506 case LTTNG_DOMAIN_JUL:
2507 case LTTNG_DOMAIN_PYTHON:
2508 if (session->ust_session) {
2509 struct lttng_ht_iter iter;
2510 struct agent *agt;
2511
2512 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2513 &iter.iter, agt, node.node) {
2514 nb_event = list_lttng_agent_events(agt, events);
2515 }
2516 }
2517 break;
2518 default:
2519 ret = LTTNG_ERR_UND;
2520 goto error;
2521 }
2522
2523 return nb_event;
2524
2525 error:
2526 /* Return negative value to differentiate return code */
2527 return -ret;
2528 }
2529
2530 /*
2531 * Using the session list, filled a lttng_session array to send back to the
2532 * client for session listing.
2533 *
2534 * The session list lock MUST be acquired before calling this function. Use
2535 * session_lock_list() and session_unlock_list().
2536 */
2537 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2538 gid_t gid)
2539 {
2540 int ret;
2541 unsigned int i = 0;
2542 struct ltt_session *session;
2543 struct ltt_session_list *list = session_get_list();
2544
2545 DBG("Getting all available session for UID %d GID %d",
2546 uid, gid);
2547 /*
2548 * Iterate over session list and append data after the control struct in
2549 * the buffer.
2550 */
2551 cds_list_for_each_entry(session, &list->head, list) {
2552 /*
2553 * Only list the sessions the user can control.
2554 */
2555 if (!session_access_ok(session, uid, gid)) {
2556 continue;
2557 }
2558
2559 struct ltt_kernel_session *ksess = session->kernel_session;
2560 struct ltt_ust_session *usess = session->ust_session;
2561
2562 if (session->consumer->type == CONSUMER_DST_NET ||
2563 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2564 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2565 ret = build_network_session_path(sessions[i].path,
2566 sizeof(sessions[i].path), session);
2567 } else {
2568 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2569 session->consumer->dst.trace_path);
2570 }
2571 if (ret < 0) {
2572 PERROR("snprintf session path");
2573 continue;
2574 }
2575
2576 strncpy(sessions[i].name, session->name, NAME_MAX);
2577 sessions[i].name[NAME_MAX - 1] = '\0';
2578 sessions[i].enabled = session->active;
2579 sessions[i].snapshot_mode = session->snapshot_mode;
2580 sessions[i].live_timer_interval = session->live_timer;
2581 i++;
2582 }
2583 }
2584
2585 /*
2586 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2587 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2588 */
2589 int cmd_data_pending(struct ltt_session *session)
2590 {
2591 int ret;
2592 struct ltt_kernel_session *ksess = session->kernel_session;
2593 struct ltt_ust_session *usess = session->ust_session;
2594
2595 assert(session);
2596
2597 /* Session MUST be stopped to ask for data availability. */
2598 if (session->active) {
2599 ret = LTTNG_ERR_SESSION_STARTED;
2600 goto error;
2601 } else {
2602 /*
2603 * If stopped, just make sure we've started before else the above call
2604 * will always send that there is data pending.
2605 *
2606 * The consumer assumes that when the data pending command is received,
2607 * the trace has been started before or else no output data is written
2608 * by the streams which is a condition for data pending. So, this is
2609 * *VERY* important that we don't ask the consumer before a start
2610 * trace.
2611 */
2612 if (!session->has_been_started) {
2613 ret = 0;
2614 goto error;
2615 }
2616 }
2617
2618 if (ksess && ksess->consumer) {
2619 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2620 if (ret == 1) {
2621 /* Data is still being extracted for the kernel. */
2622 goto error;
2623 }
2624 }
2625
2626 if (usess && usess->consumer) {
2627 ret = consumer_is_data_pending(usess->id, usess->consumer);
2628 if (ret == 1) {
2629 /* Data is still being extracted for the kernel. */
2630 goto error;
2631 }
2632 }
2633
2634 /* Data is ready to be read by a viewer */
2635 ret = 0;
2636
2637 error:
2638 return ret;
2639 }
2640
2641 /*
2642 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2643 *
2644 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2645 */
2646 int cmd_snapshot_add_output(struct ltt_session *session,
2647 struct lttng_snapshot_output *output, uint32_t *id)
2648 {
2649 int ret;
2650 struct snapshot_output *new_output;
2651
2652 assert(session);
2653 assert(output);
2654
2655 DBG("Cmd snapshot add output for session %s", session->name);
2656
2657 /*
2658 * Permission denied to create an output if the session is not
2659 * set in no output mode.
2660 */
2661 if (session->output_traces) {
2662 ret = LTTNG_ERR_EPERM;
2663 goto error;
2664 }
2665
2666 /* Only one output is allowed until we have the "tee" feature. */
2667 if (session->snapshot.nb_output == 1) {
2668 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2669 goto error;
2670 }
2671
2672 new_output = snapshot_output_alloc();
2673 if (!new_output) {
2674 ret = LTTNG_ERR_NOMEM;
2675 goto error;
2676 }
2677
2678 ret = snapshot_output_init(output->max_size, output->name,
2679 output->ctrl_url, output->data_url, session->consumer, new_output,
2680 &session->snapshot);
2681 if (ret < 0) {
2682 if (ret == -ENOMEM) {
2683 ret = LTTNG_ERR_NOMEM;
2684 } else {
2685 ret = LTTNG_ERR_INVALID;
2686 }
2687 goto free_error;
2688 }
2689
2690 rcu_read_lock();
2691 snapshot_add_output(&session->snapshot, new_output);
2692 if (id) {
2693 *id = new_output->id;
2694 }
2695 rcu_read_unlock();
2696
2697 return LTTNG_OK;
2698
2699 free_error:
2700 snapshot_output_destroy(new_output);
2701 error:
2702 return ret;
2703 }
2704
2705 /*
2706 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2707 *
2708 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2709 */
2710 int cmd_snapshot_del_output(struct ltt_session *session,
2711 struct lttng_snapshot_output *output)
2712 {
2713 int ret;
2714 struct snapshot_output *sout = NULL;
2715
2716 assert(session);
2717 assert(output);
2718
2719 rcu_read_lock();
2720
2721 /*
2722 * Permission denied to create an output if the session is not
2723 * set in no output mode.
2724 */
2725 if (session->output_traces) {
2726 ret = LTTNG_ERR_EPERM;
2727 goto error;
2728 }
2729
2730 if (output->id) {
2731 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2732 session->name);
2733 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2734 } else if (*output->name != '\0') {
2735 DBG("Cmd snapshot del output name %s for session %s", output->name,
2736 session->name);
2737 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2738 }
2739 if (!sout) {
2740 ret = LTTNG_ERR_INVALID;
2741 goto error;
2742 }
2743
2744 snapshot_delete_output(&session->snapshot, sout);
2745 snapshot_output_destroy(sout);
2746 ret = LTTNG_OK;
2747
2748 error:
2749 rcu_read_unlock();
2750 return ret;
2751 }
2752
2753 /*
2754 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2755 *
2756 * If no output is available, outputs is untouched and 0 is returned.
2757 *
2758 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2759 */
2760 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2761 struct lttng_snapshot_output **outputs)
2762 {
2763 int ret, idx = 0;
2764 struct lttng_snapshot_output *list;
2765 struct lttng_ht_iter iter;
2766 struct snapshot_output *output;
2767
2768 assert(session);
2769 assert(outputs);
2770
2771 DBG("Cmd snapshot list outputs for session %s", session->name);
2772
2773 /*
2774 * Permission denied to create an output if the session is not
2775 * set in no output mode.
2776 */
2777 if (session->output_traces) {
2778 ret = LTTNG_ERR_EPERM;
2779 goto error;
2780 }
2781
2782 if (session->snapshot.nb_output == 0) {
2783 ret = 0;
2784 goto error;
2785 }
2786
2787 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2788 if (!list) {
2789 ret = LTTNG_ERR_NOMEM;
2790 goto error;
2791 }
2792
2793 /* Copy list from session to the new list object. */
2794 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2795 output, node.node) {
2796 assert(output->consumer);
2797 list[idx].id = output->id;
2798 list[idx].max_size = output->max_size;
2799 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2800 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2801 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2802 sizeof(list[idx].ctrl_url));
2803 } else {
2804 /* Control URI. */
2805 ret = uri_to_str_url(&output->consumer->dst.net.control,
2806 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2807 if (ret < 0) {
2808 ret = LTTNG_ERR_NOMEM;
2809 goto free_error;
2810 }
2811
2812 /* Data URI. */
2813 ret = uri_to_str_url(&output->consumer->dst.net.data,
2814 list[idx].data_url, sizeof(list[idx].data_url));
2815 if (ret < 0) {
2816 ret = LTTNG_ERR_NOMEM;
2817 goto free_error;
2818 }
2819 }
2820 idx++;
2821 }
2822
2823 *outputs = list;
2824 return session->snapshot.nb_output;
2825
2826 free_error:
2827 free(list);
2828 error:
2829 return -ret;
2830 }
2831
2832 /*
2833 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2834 * snapshot output is *not* set with a remote destination.
2835 *
2836 * Return 0 on success or a LTTNG_ERR code.
2837 */
2838 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2839 struct snapshot_output *snap_output, struct ltt_session *session)
2840 {
2841 int ret = LTTNG_OK;
2842 struct lttng_ht_iter iter;
2843 struct consumer_socket *socket;
2844
2845 assert(consumer);
2846 assert(snap_output);
2847 assert(session);
2848
2849 DBG2("Set relayd object from snapshot output");
2850
2851 /* Ignore if snapshot consumer output is not network. */
2852 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2853 goto error;
2854 }
2855
2856 /*
2857 * For each consumer socket, create and send the relayd object of the
2858 * snapshot output.
2859 */
2860 rcu_read_lock();
2861 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2862 socket, node.node) {
2863 ret = send_consumer_relayd_sockets(0, session->id,
2864 snap_output->consumer, socket,
2865 session->name, session->hostname,
2866 session->live_timer);
2867 if (ret != LTTNG_OK) {
2868 rcu_read_unlock();
2869 goto error;
2870 }
2871 }
2872 rcu_read_unlock();
2873
2874 error:
2875 return ret;
2876 }
2877
2878 /*
2879 * Record a kernel snapshot.
2880 *
2881 * Return LTTNG_OK on success or a LTTNG_ERR code.
2882 */
2883 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2884 struct snapshot_output *output, struct ltt_session *session,
2885 int wait, uint64_t max_stream_size)
2886 {
2887 int ret;
2888
2889 assert(ksess);
2890 assert(output);
2891 assert(session);
2892
2893 /* Get the datetime for the snapshot output directory. */
2894 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2895 sizeof(output->datetime));
2896 if (!ret) {
2897 ret = LTTNG_ERR_INVALID;
2898 goto error;
2899 }
2900
2901 /*
2902 * Copy kernel session sockets so we can communicate with the right
2903 * consumer for the snapshot record command.
2904 */
2905 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2906 if (ret < 0) {
2907 ret = LTTNG_ERR_NOMEM;
2908 goto error;
2909 }
2910
2911 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2912 if (ret != LTTNG_OK) {
2913 goto error_snapshot;
2914 }
2915
2916 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2917 if (ret != LTTNG_OK) {
2918 goto error_snapshot;
2919 }
2920
2921 ret = LTTNG_OK;
2922
2923 error_snapshot:
2924 /* Clean up copied sockets so this output can use some other later on. */
2925 consumer_destroy_output_sockets(output->consumer);
2926 error:
2927 return ret;
2928 }
2929
2930 /*
2931 * Record a UST snapshot.
2932 *
2933 * Return 0 on success or a LTTNG_ERR error code.
2934 */
2935 static int record_ust_snapshot(struct ltt_ust_session *usess,
2936 struct snapshot_output *output, struct ltt_session *session,
2937 int wait, uint64_t max_stream_size)
2938 {
2939 int ret;
2940
2941 assert(usess);
2942 assert(output);
2943 assert(session);
2944
2945 /* Get the datetime for the snapshot output directory. */
2946 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2947 sizeof(output->datetime));
2948 if (!ret) {
2949 ret = LTTNG_ERR_INVALID;
2950 goto error;
2951 }
2952
2953 /*
2954 * Copy UST session sockets so we can communicate with the right
2955 * consumer for the snapshot record command.
2956 */
2957 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2958 if (ret < 0) {
2959 ret = LTTNG_ERR_NOMEM;
2960 goto error;
2961 }
2962
2963 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2964 if (ret != LTTNG_OK) {
2965 goto error_snapshot;
2966 }
2967
2968 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
2969 if (ret < 0) {
2970 switch (-ret) {
2971 case EINVAL:
2972 ret = LTTNG_ERR_INVALID;
2973 break;
2974 case ENODATA:
2975 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2976 break;
2977 default:
2978 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2979 break;
2980 }
2981 goto error_snapshot;
2982 }
2983
2984 ret = LTTNG_OK;
2985
2986 error_snapshot:
2987 /* Clean up copied sockets so this output can use some other later on. */
2988 consumer_destroy_output_sockets(output->consumer);
2989 error:
2990 return ret;
2991 }
2992
2993 /*
2994 * Return the biggest subbuffer size of all channels in the given session.
2995 */
2996 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
2997 {
2998 uint64_t max_size = 0;
2999
3000 assert(session);
3001
3002 if (session->kernel_session) {
3003 struct ltt_kernel_channel *chan;
3004 struct ltt_kernel_session *ksess = session->kernel_session;
3005
3006 /*
3007 * For each channel, add to the max size the size of each subbuffer
3008 * multiplied by their sized.
3009 */
3010 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3011 if (chan->channel->attr.subbuf_size > max_size) {
3012 max_size = chan->channel->attr.subbuf_size;
3013 }
3014 }
3015 }
3016
3017 if (session->ust_session) {
3018 struct lttng_ht_iter iter;
3019 struct ltt_ust_channel *uchan;
3020 struct ltt_ust_session *usess = session->ust_session;
3021
3022 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
3023 uchan, node.node) {
3024 if (uchan->attr.subbuf_size > max_size) {
3025 max_size = uchan->attr.subbuf_size;
3026 }
3027 }
3028 }
3029
3030 return max_size;
3031 }
3032
3033 /*
3034 * Returns the total number of streams for a session or a negative value
3035 * on error.
3036 */
3037 static unsigned int get_session_nb_streams(struct ltt_session *session)
3038 {
3039 unsigned int total_streams = 0;
3040
3041 if (session->kernel_session) {
3042 struct ltt_kernel_session *ksess = session->kernel_session;
3043
3044 total_streams += ksess->stream_count_global;
3045 }
3046
3047 if (session->ust_session) {
3048 struct ltt_ust_session *usess = session->ust_session;
3049
3050 total_streams += ust_app_get_nb_stream(usess);
3051 }
3052
3053 return total_streams;
3054 }
3055
3056 /*
3057 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3058 *
3059 * The wait parameter is ignored so this call always wait for the snapshot to
3060 * complete before returning.
3061 *
3062 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3063 */
3064 int cmd_snapshot_record(struct ltt_session *session,
3065 struct lttng_snapshot_output *output, int wait)
3066 {
3067 int ret = LTTNG_OK;
3068 unsigned int use_tmp_output = 0;
3069 struct snapshot_output tmp_output;
3070 unsigned int nb_streams, snapshot_success = 0;
3071 uint64_t session_max_size = 0, max_stream_size = 0;
3072
3073 assert(session);
3074 assert(output);
3075
3076 DBG("Cmd snapshot record for session %s", session->name);
3077
3078 /*
3079 * Permission denied to create an output if the session is not
3080 * set in no output mode.
3081 */
3082 if (session->output_traces) {
3083 ret = LTTNG_ERR_EPERM;
3084 goto error;
3085 }
3086
3087 /* The session needs to be started at least once. */
3088 if (!session->has_been_started) {
3089 ret = LTTNG_ERR_START_SESSION_ONCE;
3090 goto error;
3091 }
3092
3093 /* Use temporary output for the session. */
3094 if (*output->ctrl_url != '\0') {
3095 ret = snapshot_output_init(output->max_size, output->name,
3096 output->ctrl_url, output->data_url, session->consumer,
3097 &tmp_output, NULL);
3098 if (ret < 0) {
3099 if (ret == -ENOMEM) {
3100 ret = LTTNG_ERR_NOMEM;
3101 } else {
3102 ret = LTTNG_ERR_INVALID;
3103 }
3104 goto error;
3105 }
3106 /* Use the global session count for the temporary snapshot. */
3107 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3108 use_tmp_output = 1;
3109 }
3110
3111 /*
3112 * Get the session maximum size for a snapshot meaning it will compute the
3113 * size of all streams from all domain.
3114 */
3115 max_stream_size = get_session_max_subbuf_size(session);
3116
3117 nb_streams = get_session_nb_streams(session);
3118 if (nb_streams) {
3119 /*
3120 * The maximum size of the snapshot is the number of streams multiplied
3121 * by the biggest subbuf size of all channels in a session which is the
3122 * maximum stream size available for each stream. The session max size
3123 * is now checked against the snapshot max size value given by the user
3124 * and if lower, an error is returned.
3125 */
3126 session_max_size = max_stream_size * nb_streams;
3127 }
3128
3129 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3130 session_max_size, max_stream_size);
3131
3132 /*
3133 * If we use a temporary output, check right away if the max size fits else
3134 * for each output the max size will be checked.
3135 */
3136 if (use_tmp_output &&
3137 (tmp_output.max_size != 0 &&
3138 tmp_output.max_size < session_max_size)) {
3139 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3140 goto error;
3141 }
3142
3143 if (session->kernel_session) {
3144 struct ltt_kernel_session *ksess = session->kernel_session;
3145
3146 if (use_tmp_output) {
3147 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3148 wait, max_stream_size);
3149 if (ret != LTTNG_OK) {
3150 goto error;
3151 }
3152 snapshot_success = 1;
3153 } else {
3154 struct snapshot_output *sout;
3155 struct lttng_ht_iter iter;
3156
3157 rcu_read_lock();
3158 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3159 &iter.iter, sout, node.node) {
3160 /*
3161 * Make a local copy of the output and assign the possible
3162 * temporary value given by the caller.
3163 */
3164 memset(&tmp_output, 0, sizeof(tmp_output));
3165 memcpy(&tmp_output, sout, sizeof(tmp_output));
3166
3167 /* Use temporary max size. */
3168 if (output->max_size != (uint64_t) -1ULL) {
3169 tmp_output.max_size = output->max_size;
3170 }
3171
3172 if (tmp_output.max_size != 0 &&
3173 tmp_output.max_size < session_max_size) {
3174 rcu_read_unlock();
3175 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3176 goto error;
3177 }
3178
3179 /* Use temporary name. */
3180 if (*output->name != '\0') {
3181 strncpy(tmp_output.name, output->name,
3182 sizeof(tmp_output.name));
3183 }
3184
3185 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3186
3187 ret = record_kernel_snapshot(ksess, &tmp_output,
3188 session, wait, max_stream_size);
3189 if (ret != LTTNG_OK) {
3190 rcu_read_unlock();
3191 goto error;
3192 }
3193 snapshot_success = 1;
3194 }
3195 rcu_read_unlock();
3196 }
3197 }
3198
3199 if (session->ust_session) {
3200 struct ltt_ust_session *usess = session->ust_session;
3201
3202 if (use_tmp_output) {
3203 ret = record_ust_snapshot(usess, &tmp_output, session,
3204 wait, max_stream_size);
3205 if (ret != LTTNG_OK) {
3206 goto error;
3207 }
3208 snapshot_success = 1;
3209 } else {
3210 struct snapshot_output *sout;
3211 struct lttng_ht_iter iter;
3212
3213 rcu_read_lock();
3214 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3215 &iter.iter, sout, node.node) {
3216 /*
3217 * Make a local copy of the output and assign the possible
3218 * temporary value given by the caller.
3219 */
3220 memset(&tmp_output, 0, sizeof(tmp_output));
3221 memcpy(&tmp_output, sout, sizeof(tmp_output));
3222
3223 /* Use temporary max size. */
3224 if (output->max_size != (uint64_t) -1ULL) {
3225 tmp_output.max_size = output->max_size;
3226 }
3227
3228 if (tmp_output.max_size != 0 &&
3229 tmp_output.max_size < session_max_size) {
3230 rcu_read_unlock();
3231 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3232 goto error;
3233 }
3234
3235 /* Use temporary name. */
3236 if (*output->name != '\0') {
3237 strncpy(tmp_output.name, output->name,
3238 sizeof(tmp_output.name));
3239 }
3240
3241 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3242
3243 ret = record_ust_snapshot(usess, &tmp_output, session,
3244 wait, max_stream_size);
3245 if (ret != LTTNG_OK) {
3246 rcu_read_unlock();
3247 goto error;
3248 }
3249 snapshot_success = 1;
3250 }
3251 rcu_read_unlock();
3252 }
3253 }
3254
3255 if (snapshot_success) {
3256 session->snapshot.nb_snapshot++;
3257 } else {
3258 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3259 }
3260
3261 error:
3262 return ret;
3263 }
3264
3265 /*
3266 * Init command subsystem.
3267 */
3268 void cmd_init(void)
3269 {
3270 /*
3271 * Set network sequence index to 1 for streams to match a relayd
3272 * socket on the consumer side.
3273 */
3274 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3275 relayd_net_seq_idx = 1;
3276 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3277
3278 DBG("Command subsystem initialized");
3279 }
LTTng 2.0 tools and control repository
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