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[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 #define _LGPL_SOURCE
20 #include <assert.h>
21 #include <inttypes.h>
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
24
25 #include <common/defaults.h>
26 #include <common/common.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28 #include <common/relayd/relayd.h>
29 #include <common/utils.h>
30
31 #include "channel.h"
32 #include "consumer.h"
33 #include "event.h"
34 #include "health-sessiond.h"
35 #include "kernel.h"
36 #include "kernel-consumer.h"
37 #include "lttng-sessiond.h"
38 #include "utils.h"
39 #include "syscall.h"
40
41 #include "cmd.h"
42
43 /*
44 * Used to keep a unique index for each relayd socket created where this value
45 * is associated with streams on the consumer so it can match the right relayd
46 * to send to. It must be accessed with the relayd_net_seq_idx_lock
47 * held.
48 */
49 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
50 static uint64_t relayd_net_seq_idx;
51
52 /*
53 * Both functions below are special case for the Kernel domain when
54 * enabling/disabling all events.
55 */
56 static
57 int enable_kevent_all(struct ltt_session *session,
58 struct lttng_domain *domain, char *channel_name,
59 struct lttng_event *event,
60 char *filter_expression,
61 struct lttng_filter_bytecode *filter, int wpipe);
62 static
63 int disable_kevent_all(struct ltt_session *session, int domain,
64 char *channel_name,
65 struct lttng_event *event);
66
67 /*
68 * Create a session path used by list_lttng_sessions for the case that the
69 * session consumer is on the network.
70 */
71 static int build_network_session_path(char *dst, size_t size,
72 struct ltt_session *session)
73 {
74 int ret, kdata_port, udata_port;
75 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
76 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
77
78 assert(session);
79 assert(dst);
80
81 memset(tmp_urls, 0, sizeof(tmp_urls));
82 memset(tmp_uurl, 0, sizeof(tmp_uurl));
83
84 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
85
86 if (session->kernel_session && session->kernel_session->consumer) {
87 kuri = &session->kernel_session->consumer->dst.net.control;
88 kdata_port = session->kernel_session->consumer->dst.net.data.port;
89 }
90
91 if (session->ust_session && session->ust_session->consumer) {
92 uuri = &session->ust_session->consumer->dst.net.control;
93 udata_port = session->ust_session->consumer->dst.net.data.port;
94 }
95
96 if (uuri == NULL && kuri == NULL) {
97 uri = &session->consumer->dst.net.control;
98 kdata_port = session->consumer->dst.net.data.port;
99 } else if (kuri && uuri) {
100 ret = uri_compare(kuri, uuri);
101 if (ret) {
102 /* Not Equal */
103 uri = kuri;
104 /* Build uuri URL string */
105 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
106 if (ret < 0) {
107 goto error;
108 }
109 } else {
110 uri = kuri;
111 }
112 } else if (kuri && uuri == NULL) {
113 uri = kuri;
114 } else if (uuri && kuri == NULL) {
115 uri = uuri;
116 }
117
118 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
119 if (ret < 0) {
120 goto error;
121 }
122
123 /*
124 * Do we have a UST url set. If yes, this means we have both kernel and UST
125 * to print.
126 */
127 if (*tmp_uurl != '\0') {
128 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
129 tmp_urls, kdata_port, tmp_uurl, udata_port);
130 } else {
131 int dport;
132 if (kuri || (!kuri && !uuri)) {
133 dport = kdata_port;
134 } else {
135 /* No kernel URI, use the UST port. */
136 dport = udata_port;
137 }
138 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
139 }
140
141 error:
142 return ret;
143 }
144
145 /*
146 * Fill lttng_channel array of all channels.
147 */
148 static void list_lttng_channels(int domain, struct ltt_session *session,
149 struct lttng_channel *channels)
150 {
151 int i = 0;
152 struct ltt_kernel_channel *kchan;
153
154 DBG("Listing channels for session %s", session->name);
155
156 switch (domain) {
157 case LTTNG_DOMAIN_KERNEL:
158 /* Kernel channels */
159 if (session->kernel_session != NULL) {
160 cds_list_for_each_entry(kchan,
161 &session->kernel_session->channel_list.head, list) {
162 /* Copy lttng_channel struct to array */
163 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
164 channels[i].enabled = kchan->enabled;
165 i++;
166 }
167 }
168 break;
169 case LTTNG_DOMAIN_UST:
170 {
171 struct lttng_ht_iter iter;
172 struct ltt_ust_channel *uchan;
173
174 rcu_read_lock();
175 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
176 &iter.iter, uchan, node.node) {
177 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
178 channels[i].attr.overwrite = uchan->attr.overwrite;
179 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
180 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
181 channels[i].attr.switch_timer_interval =
182 uchan->attr.switch_timer_interval;
183 channels[i].attr.read_timer_interval =
184 uchan->attr.read_timer_interval;
185 channels[i].enabled = uchan->enabled;
186 channels[i].attr.tracefile_size = uchan->tracefile_size;
187 channels[i].attr.tracefile_count = uchan->tracefile_count;
188 switch (uchan->attr.output) {
189 case LTTNG_UST_MMAP:
190 default:
191 channels[i].attr.output = LTTNG_EVENT_MMAP;
192 break;
193 }
194 i++;
195 }
196 rcu_read_unlock();
197 break;
198 }
199 default:
200 break;
201 }
202 }
203
204 /*
205 * Create a list of agent domain events.
206 *
207 * Return number of events in list on success or else a negative value.
208 */
209 static int list_lttng_agent_events(struct agent *agt,
210 struct lttng_event **events)
211 {
212 int i = 0, ret = 0;
213 unsigned int nb_event = 0;
214 struct agent_event *event;
215 struct lttng_event *tmp_events;
216 struct lttng_ht_iter iter;
217
218 assert(agt);
219 assert(events);
220
221 DBG3("Listing agent events");
222
223 rcu_read_lock();
224 nb_event = lttng_ht_get_count(agt->events);
225 rcu_read_unlock();
226 if (nb_event == 0) {
227 ret = nb_event;
228 goto error;
229 }
230
231 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
232 if (!tmp_events) {
233 PERROR("zmalloc agent events session");
234 ret = -LTTNG_ERR_FATAL;
235 goto error;
236 }
237
238 rcu_read_lock();
239 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
240 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
241 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
242 tmp_events[i].enabled = event->enabled;
243 tmp_events[i].loglevel = event->loglevel;
244 tmp_events[i].loglevel_type = event->loglevel_type;
245 i++;
246 }
247 rcu_read_unlock();
248
249 *events = tmp_events;
250 ret = nb_event;
251
252 error:
253 assert(nb_event == i);
254 return ret;
255 }
256
257 /*
258 * Create a list of ust global domain events.
259 */
260 static int list_lttng_ust_global_events(char *channel_name,
261 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
262 {
263 int i = 0, ret = 0;
264 unsigned int nb_event = 0;
265 struct lttng_ht_iter iter;
266 struct lttng_ht_node_str *node;
267 struct ltt_ust_channel *uchan;
268 struct ltt_ust_event *uevent;
269 struct lttng_event *tmp;
270
271 DBG("Listing UST global events for channel %s", channel_name);
272
273 rcu_read_lock();
274
275 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
276 node = lttng_ht_iter_get_node_str(&iter);
277 if (node == NULL) {
278 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
279 goto error;
280 }
281
282 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
283
284 nb_event += lttng_ht_get_count(uchan->events);
285
286 if (nb_event == 0) {
287 ret = nb_event;
288 goto error;
289 }
290
291 DBG3("Listing UST global %d events", nb_event);
292
293 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
294 if (tmp == NULL) {
295 ret = LTTNG_ERR_FATAL;
296 goto error;
297 }
298
299 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
300 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
301 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
302 tmp[i].enabled = uevent->enabled;
303
304 switch (uevent->attr.instrumentation) {
305 case LTTNG_UST_TRACEPOINT:
306 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
307 break;
308 case LTTNG_UST_PROBE:
309 tmp[i].type = LTTNG_EVENT_PROBE;
310 break;
311 case LTTNG_UST_FUNCTION:
312 tmp[i].type = LTTNG_EVENT_FUNCTION;
313 break;
314 }
315
316 tmp[i].loglevel = uevent->attr.loglevel;
317 switch (uevent->attr.loglevel_type) {
318 case LTTNG_UST_LOGLEVEL_ALL:
319 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
320 break;
321 case LTTNG_UST_LOGLEVEL_RANGE:
322 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
323 break;
324 case LTTNG_UST_LOGLEVEL_SINGLE:
325 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
326 break;
327 }
328 if (uevent->filter) {
329 tmp[i].filter = 1;
330 }
331 if (uevent->exclusion) {
332 tmp[i].exclusion = 1;
333 }
334 i++;
335 }
336
337 ret = nb_event;
338 *events = tmp;
339
340 error:
341 rcu_read_unlock();
342 return ret;
343 }
344
345 /*
346 * Fill lttng_event array of all kernel events in the channel.
347 */
348 static int list_lttng_kernel_events(char *channel_name,
349 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
350 {
351 int i = 0, ret;
352 unsigned int nb_event;
353 struct ltt_kernel_event *event;
354 struct ltt_kernel_channel *kchan;
355
356 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
357 if (kchan == NULL) {
358 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
359 goto error;
360 }
361
362 nb_event = kchan->event_count;
363
364 DBG("Listing events for channel %s", kchan->channel->name);
365
366 if (nb_event == 0) {
367 *events = NULL;
368 goto syscall;
369 }
370
371 *events = zmalloc(nb_event * sizeof(struct lttng_event));
372 if (*events == NULL) {
373 ret = LTTNG_ERR_FATAL;
374 goto error;
375 }
376
377 /* Kernel channels */
378 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
379 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
380 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
381 (*events)[i].enabled = event->enabled;
382
383 switch (event->event->instrumentation) {
384 case LTTNG_KERNEL_TRACEPOINT:
385 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
386 break;
387 case LTTNG_KERNEL_KRETPROBE:
388 (*events)[i].type = LTTNG_EVENT_FUNCTION;
389 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
390 sizeof(struct lttng_kernel_kprobe));
391 break;
392 case LTTNG_KERNEL_KPROBE:
393 (*events)[i].type = LTTNG_EVENT_PROBE;
394 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
395 sizeof(struct lttng_kernel_kprobe));
396 break;
397 case LTTNG_KERNEL_FUNCTION:
398 (*events)[i].type = LTTNG_EVENT_FUNCTION;
399 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
400 sizeof(struct lttng_kernel_function));
401 break;
402 case LTTNG_KERNEL_NOOP:
403 (*events)[i].type = LTTNG_EVENT_NOOP;
404 break;
405 case LTTNG_KERNEL_SYSCALL:
406 (*events)[i].type = LTTNG_EVENT_SYSCALL;
407 break;
408 case LTTNG_KERNEL_ALL:
409 assert(0);
410 break;
411 }
412 i++;
413 }
414
415 syscall:
416 if (syscall_table) {
417 ssize_t new_size;
418
419 new_size = syscall_list_channel(kchan, events, nb_event);
420 if (new_size < 0) {
421 free(events);
422 ret = -new_size;
423 goto error;
424 }
425 nb_event = new_size;
426 }
427
428 return nb_event;
429
430 error:
431 /* Negate the error code to differentiate the size from an error */
432 return -ret;
433 }
434
435 /*
436 * Add URI so the consumer output object. Set the correct path depending on the
437 * domain adding the default trace directory.
438 */
439 static int add_uri_to_consumer(struct consumer_output *consumer,
440 struct lttng_uri *uri, int domain, const char *session_name)
441 {
442 int ret = LTTNG_OK;
443 const char *default_trace_dir;
444
445 assert(uri);
446
447 if (consumer == NULL) {
448 DBG("No consumer detected. Don't add URI. Stopping.");
449 ret = LTTNG_ERR_NO_CONSUMER;
450 goto error;
451 }
452
453 switch (domain) {
454 case LTTNG_DOMAIN_KERNEL:
455 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
456 break;
457 case LTTNG_DOMAIN_UST:
458 default_trace_dir = DEFAULT_UST_TRACE_DIR;
459 break;
460 default:
461 /*
462 * This case is possible is we try to add the URI to the global tracing
463 * session consumer object which in this case there is no subdir.
464 */
465 default_trace_dir = "";
466 }
467
468 switch (uri->dtype) {
469 case LTTNG_DST_IPV4:
470 case LTTNG_DST_IPV6:
471 DBG2("Setting network URI to consumer");
472
473 if (consumer->type == CONSUMER_DST_NET) {
474 if ((uri->stype == LTTNG_STREAM_CONTROL &&
475 consumer->dst.net.control_isset) ||
476 (uri->stype == LTTNG_STREAM_DATA &&
477 consumer->dst.net.data_isset)) {
478 ret = LTTNG_ERR_URL_EXIST;
479 goto error;
480 }
481 } else {
482 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
483 }
484
485 consumer->type = CONSUMER_DST_NET;
486
487 /* Set URI into consumer output object */
488 ret = consumer_set_network_uri(consumer, uri);
489 if (ret < 0) {
490 ret = -ret;
491 goto error;
492 } else if (ret == 1) {
493 /*
494 * URI was the same in the consumer so we do not append the subdir
495 * again so to not duplicate output dir.
496 */
497 ret = LTTNG_OK;
498 goto error;
499 }
500
501 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
502 ret = consumer_set_subdir(consumer, session_name);
503 if (ret < 0) {
504 ret = LTTNG_ERR_FATAL;
505 goto error;
506 }
507 }
508
509 if (uri->stype == LTTNG_STREAM_CONTROL) {
510 /* On a new subdir, reappend the default trace dir. */
511 strncat(consumer->subdir, default_trace_dir,
512 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
513 DBG3("Append domain trace name to subdir %s", consumer->subdir);
514 }
515
516 break;
517 case LTTNG_DST_PATH:
518 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
519 memset(consumer->dst.trace_path, 0,
520 sizeof(consumer->dst.trace_path));
521 strncpy(consumer->dst.trace_path, uri->dst.path,
522 sizeof(consumer->dst.trace_path));
523 /* Append default trace dir */
524 strncat(consumer->dst.trace_path, default_trace_dir,
525 sizeof(consumer->dst.trace_path) -
526 strlen(consumer->dst.trace_path) - 1);
527 /* Flag consumer as local. */
528 consumer->type = CONSUMER_DST_LOCAL;
529 break;
530 }
531
532 ret = LTTNG_OK;
533
534 error:
535 return ret;
536 }
537
538 /*
539 * Init tracing by creating trace directory and sending fds kernel consumer.
540 */
541 static int init_kernel_tracing(struct ltt_kernel_session *session)
542 {
543 int ret = 0;
544 struct lttng_ht_iter iter;
545 struct consumer_socket *socket;
546
547 assert(session);
548
549 rcu_read_lock();
550
551 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
552 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
553 socket, node.node) {
554 pthread_mutex_lock(socket->lock);
555 ret = kernel_consumer_send_session(socket, session);
556 pthread_mutex_unlock(socket->lock);
557 if (ret < 0) {
558 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
559 goto error;
560 }
561 }
562 }
563
564 error:
565 rcu_read_unlock();
566 return ret;
567 }
568
569 /*
570 * Create a socket to the relayd using the URI.
571 *
572 * On success, the relayd_sock pointer is set to the created socket.
573 * Else, it's stays untouched and a lttcomm error code is returned.
574 */
575 static int create_connect_relayd(struct lttng_uri *uri,
576 struct lttcomm_relayd_sock **relayd_sock)
577 {
578 int ret;
579 struct lttcomm_relayd_sock *rsock;
580
581 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
582 RELAYD_VERSION_COMM_MINOR);
583 if (!rsock) {
584 ret = LTTNG_ERR_FATAL;
585 goto error;
586 }
587
588 /*
589 * Connect to relayd so we can proceed with a session creation. This call
590 * can possibly block for an arbitrary amount of time to set the health
591 * state to be in poll execution.
592 */
593 health_poll_entry();
594 ret = relayd_connect(rsock);
595 health_poll_exit();
596 if (ret < 0) {
597 ERR("Unable to reach lttng-relayd");
598 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
599 goto free_sock;
600 }
601
602 /* Create socket for control stream. */
603 if (uri->stype == LTTNG_STREAM_CONTROL) {
604 DBG3("Creating relayd stream socket from URI");
605
606 /* Check relayd version */
607 ret = relayd_version_check(rsock);
608 if (ret < 0) {
609 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
610 goto close_sock;
611 }
612 } else if (uri->stype == LTTNG_STREAM_DATA) {
613 DBG3("Creating relayd data socket from URI");
614 } else {
615 /* Command is not valid */
616 ERR("Relayd invalid stream type: %d", uri->stype);
617 ret = LTTNG_ERR_INVALID;
618 goto close_sock;
619 }
620
621 *relayd_sock = rsock;
622
623 return LTTNG_OK;
624
625 close_sock:
626 /* The returned value is not useful since we are on an error path. */
627 (void) relayd_close(rsock);
628 free_sock:
629 free(rsock);
630 error:
631 return ret;
632 }
633
634 /*
635 * Connect to the relayd using URI and send the socket to the right consumer.
636 */
637 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
638 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
639 struct consumer_socket *consumer_sock,
640 char *session_name, char *hostname, int session_live_timer)
641 {
642 int ret;
643 struct lttcomm_relayd_sock *rsock = NULL;
644
645 /* Connect to relayd and make version check if uri is the control. */
646 ret = create_connect_relayd(relayd_uri, &rsock);
647 if (ret != LTTNG_OK) {
648 goto error;
649 }
650 assert(rsock);
651
652 /* Set the network sequence index if not set. */
653 if (consumer->net_seq_index == (uint64_t) -1ULL) {
654 pthread_mutex_lock(&relayd_net_seq_idx_lock);
655 /*
656 * Increment net_seq_idx because we are about to transfer the
657 * new relayd socket to the consumer.
658 * Assign unique key so the consumer can match streams.
659 */
660 consumer->net_seq_index = ++relayd_net_seq_idx;
661 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
662 }
663
664 /* Send relayd socket to consumer. */
665 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
666 relayd_uri->stype, session_id,
667 session_name, hostname, session_live_timer);
668 if (ret < 0) {
669 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
670 goto close_sock;
671 }
672
673 /* Flag that the corresponding socket was sent. */
674 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
675 consumer_sock->control_sock_sent = 1;
676 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
677 consumer_sock->data_sock_sent = 1;
678 }
679
680 ret = LTTNG_OK;
681
682 /*
683 * Close socket which was dup on the consumer side. The session daemon does
684 * NOT keep track of the relayd socket(s) once transfer to the consumer.
685 */
686
687 close_sock:
688 (void) relayd_close(rsock);
689 free(rsock);
690
691 error:
692 if (ret != LTTNG_OK) {
693 /*
694 * The consumer output for this session should not be used anymore
695 * since the relayd connection failed thus making any tracing or/and
696 * streaming not usable.
697 */
698 consumer->enabled = 0;
699 }
700 return ret;
701 }
702
703 /*
704 * Send both relayd sockets to a specific consumer and domain. This is a
705 * helper function to facilitate sending the information to the consumer for a
706 * session.
707 */
708 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
709 struct consumer_output *consumer, struct consumer_socket *sock,
710 char *session_name, char *hostname, int session_live_timer)
711 {
712 int ret = LTTNG_OK;
713
714 assert(consumer);
715 assert(sock);
716
717 /* Sending control relayd socket. */
718 if (!sock->control_sock_sent) {
719 ret = send_consumer_relayd_socket(domain, session_id,
720 &consumer->dst.net.control, consumer, sock,
721 session_name, hostname, session_live_timer);
722 if (ret != LTTNG_OK) {
723 goto error;
724 }
725 }
726
727 /* Sending data relayd socket. */
728 if (!sock->data_sock_sent) {
729 ret = send_consumer_relayd_socket(domain, session_id,
730 &consumer->dst.net.data, consumer, sock,
731 session_name, hostname, session_live_timer);
732 if (ret != LTTNG_OK) {
733 goto error;
734 }
735 }
736
737 error:
738 return ret;
739 }
740
741 /*
742 * Setup relayd connections for a tracing session. First creates the socket to
743 * the relayd and send them to the right domain consumer. Consumer type MUST be
744 * network.
745 */
746 int cmd_setup_relayd(struct ltt_session *session)
747 {
748 int ret = LTTNG_OK;
749 struct ltt_ust_session *usess;
750 struct ltt_kernel_session *ksess;
751 struct consumer_socket *socket;
752 struct lttng_ht_iter iter;
753
754 assert(session);
755
756 usess = session->ust_session;
757 ksess = session->kernel_session;
758
759 DBG("Setting relayd for session %s", session->name);
760
761 rcu_read_lock();
762
763 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
764 && usess->consumer->enabled) {
765 /* For each consumer socket, send relayd sockets */
766 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
767 socket, node.node) {
768 pthread_mutex_lock(socket->lock);
769 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
770 usess->consumer, socket,
771 session->name, session->hostname,
772 session->live_timer);
773 pthread_mutex_unlock(socket->lock);
774 if (ret != LTTNG_OK) {
775 goto error;
776 }
777 /* Session is now ready for network streaming. */
778 session->net_handle = 1;
779 }
780 }
781
782 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
783 && ksess->consumer->enabled) {
784 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
785 socket, node.node) {
786 pthread_mutex_lock(socket->lock);
787 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
788 ksess->consumer, socket,
789 session->name, session->hostname,
790 session->live_timer);
791 pthread_mutex_unlock(socket->lock);
792 if (ret != LTTNG_OK) {
793 goto error;
794 }
795 /* Session is now ready for network streaming. */
796 session->net_handle = 1;
797 }
798 }
799
800 error:
801 rcu_read_unlock();
802 return ret;
803 }
804
805 /*
806 * Start a kernel session by opening all necessary streams.
807 */
808 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
809 {
810 int ret;
811 struct ltt_kernel_channel *kchan;
812
813 /* Open kernel metadata */
814 if (ksess->metadata == NULL && ksess->output_traces) {
815 ret = kernel_open_metadata(ksess);
816 if (ret < 0) {
817 ret = LTTNG_ERR_KERN_META_FAIL;
818 goto error;
819 }
820 }
821
822 /* Open kernel metadata stream */
823 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
824 ret = kernel_open_metadata_stream(ksess);
825 if (ret < 0) {
826 ERR("Kernel create metadata stream failed");
827 ret = LTTNG_ERR_KERN_STREAM_FAIL;
828 goto error;
829 }
830 }
831
832 /* For each channel */
833 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
834 if (kchan->stream_count == 0) {
835 ret = kernel_open_channel_stream(kchan);
836 if (ret < 0) {
837 ret = LTTNG_ERR_KERN_STREAM_FAIL;
838 goto error;
839 }
840 /* Update the stream global counter */
841 ksess->stream_count_global += ret;
842 }
843 }
844
845 /* Setup kernel consumer socket and send fds to it */
846 ret = init_kernel_tracing(ksess);
847 if (ret != 0) {
848 ret = LTTNG_ERR_KERN_START_FAIL;
849 goto error;
850 }
851
852 /* This start the kernel tracing */
853 ret = kernel_start_session(ksess);
854 if (ret < 0) {
855 ret = LTTNG_ERR_KERN_START_FAIL;
856 goto error;
857 }
858
859 /* Quiescent wait after starting trace */
860 kernel_wait_quiescent(kernel_tracer_fd);
861
862 ksess->active = 1;
863
864 ret = LTTNG_OK;
865
866 error:
867 return ret;
868 }
869
870 /*
871 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
872 */
873 int cmd_disable_channel(struct ltt_session *session, int domain,
874 char *channel_name)
875 {
876 int ret;
877 struct ltt_ust_session *usess;
878
879 usess = session->ust_session;
880
881 rcu_read_lock();
882
883 switch (domain) {
884 case LTTNG_DOMAIN_KERNEL:
885 {
886 ret = channel_kernel_disable(session->kernel_session,
887 channel_name);
888 if (ret != LTTNG_OK) {
889 goto error;
890 }
891
892 kernel_wait_quiescent(kernel_tracer_fd);
893 break;
894 }
895 case LTTNG_DOMAIN_UST:
896 {
897 struct ltt_ust_channel *uchan;
898 struct lttng_ht *chan_ht;
899
900 chan_ht = usess->domain_global.channels;
901
902 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
903 if (uchan == NULL) {
904 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
905 goto error;
906 }
907
908 ret = channel_ust_disable(usess, uchan);
909 if (ret != LTTNG_OK) {
910 goto error;
911 }
912 break;
913 }
914 #if 0
915 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
916 case LTTNG_DOMAIN_UST_EXEC_NAME:
917 case LTTNG_DOMAIN_UST_PID:
918 #endif
919 default:
920 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
921 goto error;
922 }
923
924 ret = LTTNG_OK;
925
926 error:
927 rcu_read_unlock();
928 return ret;
929 }
930
931 /*
932 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
933 *
934 * The wpipe arguments is used as a notifier for the kernel thread.
935 */
936 int cmd_enable_channel(struct ltt_session *session,
937 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
938 {
939 int ret;
940 struct ltt_ust_session *usess = session->ust_session;
941 struct lttng_ht *chan_ht;
942
943 assert(session);
944 assert(attr);
945 assert(domain);
946
947 DBG("Enabling channel %s for session %s", attr->name, session->name);
948
949 rcu_read_lock();
950
951 /*
952 * Don't try to enable a channel if the session has been started at
953 * some point in time before. The tracer does not allow it.
954 */
955 if (session->has_been_started) {
956 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
957 goto error;
958 }
959
960 /*
961 * If the session is a live session, remove the switch timer, the
962 * live timer does the same thing but sends also synchronisation
963 * beacons for inactive streams.
964 */
965 if (session->live_timer > 0) {
966 attr->attr.live_timer_interval = session->live_timer;
967 attr->attr.switch_timer_interval = 0;
968 }
969
970 /*
971 * The ringbuffer (both in user space and kernel) behave badly in overwrite
972 * mode and with less than 2 subbuf so block it right away and send back an
973 * invalid attribute error.
974 */
975 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
976 ret = LTTNG_ERR_INVALID;
977 goto error;
978 }
979
980 switch (domain->type) {
981 case LTTNG_DOMAIN_KERNEL:
982 {
983 struct ltt_kernel_channel *kchan;
984
985 kchan = trace_kernel_get_channel_by_name(attr->name,
986 session->kernel_session);
987 if (kchan == NULL) {
988 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
989 if (attr->name[0] != '\0') {
990 session->kernel_session->has_non_default_channel = 1;
991 }
992 } else {
993 ret = channel_kernel_enable(session->kernel_session, kchan);
994 }
995
996 if (ret != LTTNG_OK) {
997 goto error;
998 }
999
1000 kernel_wait_quiescent(kernel_tracer_fd);
1001 break;
1002 }
1003 case LTTNG_DOMAIN_UST:
1004 {
1005 struct ltt_ust_channel *uchan;
1006
1007 chan_ht = usess->domain_global.channels;
1008
1009 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1010 if (uchan == NULL) {
1011 ret = channel_ust_create(usess, attr, domain->buf_type);
1012 if (attr->name[0] != '\0') {
1013 usess->has_non_default_channel = 1;
1014 }
1015 } else {
1016 ret = channel_ust_enable(usess, uchan);
1017 }
1018 break;
1019 }
1020 default:
1021 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1022 goto error;
1023 }
1024
1025 error:
1026 rcu_read_unlock();
1027 return ret;
1028 }
1029
1030
1031 /*
1032 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1033 */
1034 int cmd_disable_event(struct ltt_session *session, int domain,
1035 char *channel_name,
1036 struct lttng_event *event)
1037 {
1038 int ret;
1039 char *event_name;
1040
1041 DBG("Disable event command for event \'%s\'", event->name);
1042
1043 event_name = event->name;
1044
1045 /* Error out on unhandled search criteria */
1046 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1047 || event->pid || event->filter || event->exclusion) {
1048 return LTTNG_ERR_UNK;
1049 }
1050 /* Special handling for kernel domain all events. */
1051 if (domain == LTTNG_DOMAIN_KERNEL && !strcmp(event_name, "*")) {
1052 return disable_kevent_all(session, domain, channel_name, event);
1053 }
1054
1055 rcu_read_lock();
1056
1057 switch (domain) {
1058 case LTTNG_DOMAIN_KERNEL:
1059 {
1060 struct ltt_kernel_channel *kchan;
1061 struct ltt_kernel_session *ksess;
1062
1063 ksess = session->kernel_session;
1064
1065 /*
1066 * If a non-default channel has been created in the
1067 * session, explicitely require that -c chan_name needs
1068 * to be provided.
1069 */
1070 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1071 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1072 goto error;
1073 }
1074
1075 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1076 if (kchan == NULL) {
1077 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1078 goto error;
1079 }
1080
1081 switch (event->type) {
1082 case LTTNG_EVENT_ALL:
1083 case LTTNG_EVENT_TRACEPOINT:
1084 ret = event_kernel_disable_tracepoint(kchan, event_name);
1085 if (ret != LTTNG_OK) {
1086 goto error;
1087 }
1088 break;
1089 case LTTNG_EVENT_SYSCALL:
1090 ret = event_kernel_disable_syscall(kchan, event_name);
1091 if (ret != LTTNG_OK) {
1092 goto error;
1093 }
1094 break;
1095 default:
1096 ret = LTTNG_ERR_UNK;
1097 goto error;
1098 }
1099
1100 kernel_wait_quiescent(kernel_tracer_fd);
1101 break;
1102 }
1103 case LTTNG_DOMAIN_UST:
1104 {
1105 struct ltt_ust_channel *uchan;
1106 struct ltt_ust_session *usess;
1107
1108 usess = session->ust_session;
1109
1110 /*
1111 * If a non-default channel has been created in the
1112 * session, explicitely require that -c chan_name needs
1113 * to be provided.
1114 */
1115 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1116 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1117 goto error;
1118 }
1119
1120 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1121 channel_name);
1122 if (uchan == NULL) {
1123 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1124 goto error;
1125 }
1126
1127 switch (event->type) {
1128 case LTTNG_EVENT_ALL:
1129 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1130 if (ret != LTTNG_OK) {
1131 goto error;
1132 }
1133 break;
1134 default:
1135 ret = LTTNG_ERR_UNK;
1136 goto error;
1137 }
1138
1139 DBG3("Disable UST event %s in channel %s completed", event_name,
1140 channel_name);
1141 break;
1142 }
1143 case LTTNG_DOMAIN_LOG4J:
1144 case LTTNG_DOMAIN_JUL:
1145 case LTTNG_DOMAIN_PYTHON:
1146 {
1147 struct agent *agt;
1148 struct ltt_ust_session *usess = session->ust_session;
1149
1150 assert(usess);
1151
1152 switch (event->type) {
1153 case LTTNG_EVENT_ALL:
1154 break;
1155 default:
1156 ret = LTTNG_ERR_UNK;
1157 goto error;
1158 }
1159
1160 agt = trace_ust_find_agent(usess, domain);
1161 if (!agt) {
1162 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1163 goto error;
1164 }
1165 /* The wild card * means that everything should be disabled. */
1166 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1167 ret = event_agent_disable_all(usess, agt);
1168 } else {
1169 ret = event_agent_disable(usess, agt, event_name);
1170 }
1171 if (ret != LTTNG_OK) {
1172 goto error;
1173 }
1174
1175 break;
1176 }
1177 #if 0
1178 case LTTNG_DOMAIN_UST_EXEC_NAME:
1179 case LTTNG_DOMAIN_UST_PID:
1180 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1181 #endif
1182 default:
1183 ret = LTTNG_ERR_UND;
1184 goto error;
1185 }
1186
1187 ret = LTTNG_OK;
1188
1189 error:
1190 rcu_read_unlock();
1191 return ret;
1192 }
1193
1194 /*
1195 * Command LTTNG_DISABLE_EVENT for event "*" processed by the client thread.
1196 */
1197 static
1198 int disable_kevent_all(struct ltt_session *session, int domain,
1199 char *channel_name,
1200 struct lttng_event *event)
1201 {
1202 int ret;
1203
1204 rcu_read_lock();
1205
1206 switch (domain) {
1207 case LTTNG_DOMAIN_KERNEL:
1208 {
1209 struct ltt_kernel_session *ksess;
1210 struct ltt_kernel_channel *kchan;
1211
1212 ksess = session->kernel_session;
1213
1214 /*
1215 * If a non-default channel has been created in the
1216 * session, explicitely require that -c chan_name needs
1217 * to be provided.
1218 */
1219 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1220 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1221 goto error;
1222 }
1223
1224 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1225 if (kchan == NULL) {
1226 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1227 goto error;
1228 }
1229
1230 switch (event->type) {
1231 case LTTNG_EVENT_ALL:
1232 ret = event_kernel_disable_all(kchan);
1233 if (ret != LTTNG_OK) {
1234 goto error;
1235 }
1236 break;
1237 case LTTNG_EVENT_SYSCALL:
1238 ret = event_kernel_disable_syscall(kchan, "");
1239 if (ret != LTTNG_OK) {
1240 goto error;
1241 }
1242 break;
1243 default:
1244 ret = LTTNG_ERR_UNK;
1245 goto error;
1246 }
1247
1248 kernel_wait_quiescent(kernel_tracer_fd);
1249 break;
1250 }
1251 default:
1252 ret = LTTNG_ERR_UND;
1253 goto error;
1254 }
1255
1256 ret = LTTNG_OK;
1257
1258 error:
1259 rcu_read_unlock();
1260 return ret;
1261 }
1262
1263 /*
1264 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1265 */
1266 int cmd_add_context(struct ltt_session *session, int domain,
1267 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1268 {
1269 int ret, chan_kern_created = 0, chan_ust_created = 0;
1270
1271 switch (domain) {
1272 case LTTNG_DOMAIN_KERNEL:
1273 assert(session->kernel_session);
1274
1275 if (session->kernel_session->channel_count == 0) {
1276 /* Create default channel */
1277 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1278 if (ret != LTTNG_OK) {
1279 goto error;
1280 }
1281 chan_kern_created = 1;
1282 }
1283 /* Add kernel context to kernel tracer */
1284 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1285 if (ret != LTTNG_OK) {
1286 goto error;
1287 }
1288 break;
1289 case LTTNG_DOMAIN_UST:
1290 {
1291 struct ltt_ust_session *usess = session->ust_session;
1292 unsigned int chan_count;
1293
1294 assert(usess);
1295
1296 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1297 if (chan_count == 0) {
1298 struct lttng_channel *attr;
1299 /* Create default channel */
1300 attr = channel_new_default_attr(domain, usess->buffer_type);
1301 if (attr == NULL) {
1302 ret = LTTNG_ERR_FATAL;
1303 goto error;
1304 }
1305
1306 ret = channel_ust_create(usess, attr, usess->buffer_type);
1307 if (ret != LTTNG_OK) {
1308 free(attr);
1309 goto error;
1310 }
1311 free(attr);
1312 chan_ust_created = 1;
1313 }
1314
1315 ret = context_ust_add(usess, domain, ctx, channel_name);
1316 if (ret != LTTNG_OK) {
1317 goto error;
1318 }
1319 break;
1320 }
1321 #if 0
1322 case LTTNG_DOMAIN_UST_EXEC_NAME:
1323 case LTTNG_DOMAIN_UST_PID:
1324 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1325 #endif
1326 default:
1327 ret = LTTNG_ERR_UND;
1328 goto error;
1329 }
1330
1331 return LTTNG_OK;
1332
1333 error:
1334 if (chan_kern_created) {
1335 struct ltt_kernel_channel *kchan =
1336 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1337 session->kernel_session);
1338 /* Created previously, this should NOT fail. */
1339 assert(kchan);
1340 kernel_destroy_channel(kchan);
1341 }
1342
1343 if (chan_ust_created) {
1344 struct ltt_ust_channel *uchan =
1345 trace_ust_find_channel_by_name(
1346 session->ust_session->domain_global.channels,
1347 DEFAULT_CHANNEL_NAME);
1348 /* Created previously, this should NOT fail. */
1349 assert(uchan);
1350 /* Remove from the channel list of the session. */
1351 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1352 uchan);
1353 trace_ust_destroy_channel(uchan);
1354 }
1355 return ret;
1356 }
1357
1358 static int validate_event_name(const char *name)
1359 {
1360 int ret = 0;
1361 const char *c = name;
1362 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1363
1364 /*
1365 * Make sure that unescaped wildcards are only used as the last
1366 * character of the event name.
1367 */
1368 while (c < event_name_end) {
1369 switch (*c) {
1370 case '\0':
1371 goto end;
1372 case '\\':
1373 c++;
1374 break;
1375 case '*':
1376 if ((c + 1) < event_name_end && *(c + 1)) {
1377 /* Wildcard is not the last character */
1378 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1379 goto end;
1380 }
1381 default:
1382 break;
1383 }
1384 c++;
1385 }
1386 end:
1387 return ret;
1388 }
1389
1390 /*
1391 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1392 * We own filter, exclusion, and filter_expression.
1393 */
1394 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1395 char *channel_name, struct lttng_event *event,
1396 char *filter_expression,
1397 struct lttng_filter_bytecode *filter,
1398 struct lttng_event_exclusion *exclusion,
1399 int wpipe)
1400 {
1401 int ret, channel_created = 0;
1402 struct lttng_channel *attr;
1403
1404 assert(session);
1405 assert(event);
1406 assert(channel_name);
1407
1408 DBG("Enable event command for event \'%s\'", event->name);
1409
1410 /* Special handling for kernel domain all events. */
1411 if (domain->type == LTTNG_DOMAIN_KERNEL && !strcmp(event->name, "*")) {
1412 return enable_kevent_all(session, domain, channel_name, event,
1413 filter_expression, filter, wpipe);
1414 }
1415
1416 ret = validate_event_name(event->name);
1417 if (ret) {
1418 goto error;
1419 }
1420
1421 rcu_read_lock();
1422
1423 switch (domain->type) {
1424 case LTTNG_DOMAIN_KERNEL:
1425 {
1426 struct ltt_kernel_channel *kchan;
1427
1428 /*
1429 * If a non-default channel has been created in the
1430 * session, explicitely require that -c chan_name needs
1431 * to be provided.
1432 */
1433 if (session->kernel_session->has_non_default_channel
1434 && channel_name[0] == '\0') {
1435 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1436 goto error;
1437 }
1438
1439 kchan = trace_kernel_get_channel_by_name(channel_name,
1440 session->kernel_session);
1441 if (kchan == NULL) {
1442 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1443 LTTNG_BUFFER_GLOBAL);
1444 if (attr == NULL) {
1445 ret = LTTNG_ERR_FATAL;
1446 goto error;
1447 }
1448 strncpy(attr->name, channel_name, sizeof(attr->name));
1449
1450 ret = cmd_enable_channel(session, domain, attr, wpipe);
1451 if (ret != LTTNG_OK) {
1452 free(attr);
1453 goto error;
1454 }
1455 free(attr);
1456
1457 channel_created = 1;
1458 }
1459
1460 /* Get the newly created kernel channel pointer */
1461 kchan = trace_kernel_get_channel_by_name(channel_name,
1462 session->kernel_session);
1463 if (kchan == NULL) {
1464 /* This sould not happen... */
1465 ret = LTTNG_ERR_FATAL;
1466 goto error;
1467 }
1468
1469 switch (event->type) {
1470 case LTTNG_EVENT_ALL:
1471 case LTTNG_EVENT_PROBE:
1472 case LTTNG_EVENT_FUNCTION:
1473 case LTTNG_EVENT_FUNCTION_ENTRY:
1474 case LTTNG_EVENT_TRACEPOINT:
1475 ret = event_kernel_enable_tracepoint(kchan, event);
1476 if (ret != LTTNG_OK) {
1477 if (channel_created) {
1478 /* Let's not leak a useless channel. */
1479 kernel_destroy_channel(kchan);
1480 }
1481 goto error;
1482 }
1483 break;
1484 case LTTNG_EVENT_SYSCALL:
1485 ret = event_kernel_enable_syscall(kchan, event->name);
1486 if (ret != LTTNG_OK) {
1487 goto error;
1488 }
1489 break;
1490 default:
1491 ret = LTTNG_ERR_UNK;
1492 goto error;
1493 }
1494
1495 kernel_wait_quiescent(kernel_tracer_fd);
1496 break;
1497 }
1498 case LTTNG_DOMAIN_UST:
1499 {
1500 struct ltt_ust_channel *uchan;
1501 struct ltt_ust_session *usess = session->ust_session;
1502
1503 assert(usess);
1504
1505 /*
1506 * If a non-default channel has been created in the
1507 * session, explicitely require that -c chan_name needs
1508 * to be provided.
1509 */
1510 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1511 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1512 goto error;
1513 }
1514
1515 /* Get channel from global UST domain */
1516 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1517 channel_name);
1518 if (uchan == NULL) {
1519 /* Create default channel */
1520 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1521 usess->buffer_type);
1522 if (attr == NULL) {
1523 ret = LTTNG_ERR_FATAL;
1524 goto error;
1525 }
1526 strncpy(attr->name, channel_name, sizeof(attr->name));
1527
1528 ret = cmd_enable_channel(session, domain, attr, wpipe);
1529 if (ret != LTTNG_OK) {
1530 free(attr);
1531 goto error;
1532 }
1533 free(attr);
1534
1535 /* Get the newly created channel reference back */
1536 uchan = trace_ust_find_channel_by_name(
1537 usess->domain_global.channels, channel_name);
1538 assert(uchan);
1539 }
1540
1541 /* At this point, the session and channel exist on the tracer */
1542 ret = event_ust_enable_tracepoint(usess, uchan, event,
1543 filter_expression, filter, exclusion);
1544 /* We have passed ownership */
1545 filter_expression = NULL;
1546 filter = NULL;
1547 exclusion = NULL;
1548 if (ret != LTTNG_OK) {
1549 goto error;
1550 }
1551 break;
1552 }
1553 case LTTNG_DOMAIN_LOG4J:
1554 case LTTNG_DOMAIN_JUL:
1555 case LTTNG_DOMAIN_PYTHON:
1556 {
1557 const char *default_event_name, *default_chan_name;
1558 struct agent *agt;
1559 struct lttng_event uevent;
1560 struct lttng_domain tmp_dom;
1561 struct ltt_ust_session *usess = session->ust_session;
1562
1563 assert(usess);
1564
1565 agt = trace_ust_find_agent(usess, domain->type);
1566 if (!agt) {
1567 agt = agent_create(domain->type);
1568 if (!agt) {
1569 ret = -LTTNG_ERR_NOMEM;
1570 goto error;
1571 }
1572 agent_add(agt, usess->agents);
1573 }
1574
1575 /* Create the default tracepoint. */
1576 memset(&uevent, 0, sizeof(uevent));
1577 uevent.type = LTTNG_EVENT_TRACEPOINT;
1578 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1579 default_event_name = event_get_default_agent_ust_name(domain->type);
1580 if (!default_event_name) {
1581 ret = -LTTNG_ERR_FATAL;
1582 goto error;
1583 }
1584 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1585 uevent.name[sizeof(uevent.name) - 1] = '\0';
1586
1587 /*
1588 * The domain type is changed because we are about to enable the
1589 * default channel and event for the JUL domain that are hardcoded.
1590 * This happens in the UST domain.
1591 */
1592 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1593 tmp_dom.type = LTTNG_DOMAIN_UST;
1594
1595 switch (domain->type) {
1596 case LTTNG_DOMAIN_LOG4J:
1597 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1598 break;
1599 case LTTNG_DOMAIN_JUL:
1600 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1601 break;
1602 case LTTNG_DOMAIN_PYTHON:
1603 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1604 break;
1605 default:
1606 /* The switch/case we are in should avoid this else big problem */
1607 assert(0);
1608 }
1609
1610 {
1611 struct lttng_filter_bytecode *filter_copy = NULL;
1612
1613 if (filter) {
1614 filter_copy = zmalloc(
1615 sizeof(struct lttng_filter_bytecode)
1616 + filter->len);
1617 if (!filter_copy) {
1618 goto error;
1619 }
1620
1621 memcpy(filter_copy, filter,
1622 sizeof(struct lttng_filter_bytecode)
1623 + filter->len);
1624 }
1625
1626 ret = cmd_enable_event(session, &tmp_dom,
1627 (char *) default_chan_name,
1628 &uevent, filter_expression, filter_copy,
1629 NULL, wpipe);
1630 /* We have passed ownership */
1631 filter_expression = NULL;
1632 }
1633
1634 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1635 goto error;
1636 }
1637
1638 /* The wild card * means that everything should be enabled. */
1639 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1640 ret = event_agent_enable_all(usess, agt, event, filter);
1641 filter = NULL;
1642 } else {
1643 ret = event_agent_enable(usess, agt, event, filter);
1644 filter = NULL;
1645 }
1646 if (ret != LTTNG_OK) {
1647 goto error;
1648 }
1649
1650 break;
1651 }
1652 #if 0
1653 case LTTNG_DOMAIN_UST_EXEC_NAME:
1654 case LTTNG_DOMAIN_UST_PID:
1655 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1656 #endif
1657 default:
1658 ret = LTTNG_ERR_UND;
1659 goto error;
1660 }
1661
1662 ret = LTTNG_OK;
1663
1664 error:
1665 free(filter_expression);
1666 free(filter);
1667 free(exclusion);
1668 rcu_read_unlock();
1669 return ret;
1670 }
1671
1672 /*
1673 * Command LTTNG_ENABLE_EVENT for event "*" processed by the client thread.
1674 */
1675 static
1676 int enable_kevent_all(struct ltt_session *session,
1677 struct lttng_domain *domain, char *channel_name,
1678 struct lttng_event *event,
1679 char *filter_expression,
1680 struct lttng_filter_bytecode *filter, int wpipe)
1681 {
1682 int ret;
1683 struct lttng_channel *attr;
1684
1685 assert(session);
1686 assert(channel_name);
1687
1688 rcu_read_lock();
1689
1690 switch (domain->type) {
1691 case LTTNG_DOMAIN_KERNEL:
1692 {
1693 struct ltt_kernel_channel *kchan;
1694
1695 assert(session->kernel_session);
1696
1697 /*
1698 * If a non-default channel has been created in the
1699 * session, explicitely require that -c chan_name needs
1700 * to be provided.
1701 */
1702 if (session->kernel_session->has_non_default_channel
1703 && channel_name[0] == '\0') {
1704 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1705 goto error;
1706 }
1707
1708 kchan = trace_kernel_get_channel_by_name(channel_name,
1709 session->kernel_session);
1710 if (kchan == NULL) {
1711 /* Create default channel */
1712 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1713 LTTNG_BUFFER_GLOBAL);
1714 if (attr == NULL) {
1715 ret = LTTNG_ERR_FATAL;
1716 goto error;
1717 }
1718 strncpy(attr->name, channel_name, sizeof(attr->name));
1719
1720 ret = cmd_enable_channel(session, domain, attr, wpipe);
1721 if (ret != LTTNG_OK) {
1722 free(attr);
1723 goto error;
1724 }
1725 free(attr);
1726
1727 /* Get the newly created kernel channel pointer */
1728 kchan = trace_kernel_get_channel_by_name(channel_name,
1729 session->kernel_session);
1730 assert(kchan);
1731 }
1732
1733 switch (event->type) {
1734 case LTTNG_EVENT_SYSCALL:
1735 ret = event_kernel_enable_syscall(kchan, "");
1736 if (ret != LTTNG_OK) {
1737 goto error;
1738 }
1739 break;
1740 case LTTNG_EVENT_TRACEPOINT:
1741 /*
1742 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1743 * events already registered to the channel.
1744 */
1745 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1746 break;
1747 case LTTNG_EVENT_ALL:
1748 /* Enable syscalls and tracepoints */
1749 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1750 break;
1751 default:
1752 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1753 goto error;
1754 }
1755
1756 /* Manage return value */
1757 if (ret != LTTNG_OK) {
1758 /*
1759 * On error, cmd_enable_channel call will take care of destroying
1760 * the created channel if it was needed.
1761 */
1762 goto error;
1763 }
1764
1765 kernel_wait_quiescent(kernel_tracer_fd);
1766 break;
1767 }
1768 default:
1769 ret = LTTNG_ERR_UND;
1770 goto error;
1771 }
1772
1773 ret = LTTNG_OK;
1774
1775 error:
1776 rcu_read_unlock();
1777 return ret;
1778 }
1779
1780
1781 /*
1782 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1783 */
1784 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1785 {
1786 int ret;
1787 ssize_t nb_events = 0;
1788
1789 switch (domain) {
1790 case LTTNG_DOMAIN_KERNEL:
1791 nb_events = kernel_list_events(kernel_tracer_fd, events);
1792 if (nb_events < 0) {
1793 ret = LTTNG_ERR_KERN_LIST_FAIL;
1794 goto error;
1795 }
1796 break;
1797 case LTTNG_DOMAIN_UST:
1798 nb_events = ust_app_list_events(events);
1799 if (nb_events < 0) {
1800 ret = LTTNG_ERR_UST_LIST_FAIL;
1801 goto error;
1802 }
1803 break;
1804 case LTTNG_DOMAIN_LOG4J:
1805 case LTTNG_DOMAIN_JUL:
1806 case LTTNG_DOMAIN_PYTHON:
1807 nb_events = agent_list_events(events, domain);
1808 if (nb_events < 0) {
1809 ret = LTTNG_ERR_UST_LIST_FAIL;
1810 goto error;
1811 }
1812 break;
1813 default:
1814 ret = LTTNG_ERR_UND;
1815 goto error;
1816 }
1817
1818 return nb_events;
1819
1820 error:
1821 /* Return negative value to differentiate return code */
1822 return -ret;
1823 }
1824
1825 /*
1826 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1827 */
1828 ssize_t cmd_list_tracepoint_fields(int domain,
1829 struct lttng_event_field **fields)
1830 {
1831 int ret;
1832 ssize_t nb_fields = 0;
1833
1834 switch (domain) {
1835 case LTTNG_DOMAIN_UST:
1836 nb_fields = ust_app_list_event_fields(fields);
1837 if (nb_fields < 0) {
1838 ret = LTTNG_ERR_UST_LIST_FAIL;
1839 goto error;
1840 }
1841 break;
1842 case LTTNG_DOMAIN_KERNEL:
1843 default: /* fall-through */
1844 ret = LTTNG_ERR_UND;
1845 goto error;
1846 }
1847
1848 return nb_fields;
1849
1850 error:
1851 /* Return negative value to differentiate return code */
1852 return -ret;
1853 }
1854
1855 ssize_t cmd_list_syscalls(struct lttng_event **events)
1856 {
1857 return syscall_table_list(events);
1858 }
1859
1860 /*
1861 * Command LTTNG_START_TRACE processed by the client thread.
1862 */
1863 int cmd_start_trace(struct ltt_session *session)
1864 {
1865 int ret;
1866 unsigned long nb_chan = 0;
1867 struct ltt_kernel_session *ksession;
1868 struct ltt_ust_session *usess;
1869
1870 assert(session);
1871
1872 /* Ease our life a bit ;) */
1873 ksession = session->kernel_session;
1874 usess = session->ust_session;
1875
1876 /* Is the session already started? */
1877 if (session->active) {
1878 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1879 goto error;
1880 }
1881
1882 /*
1883 * Starting a session without channel is useless since after that it's not
1884 * possible to enable channel thus inform the client.
1885 */
1886 if (usess && usess->domain_global.channels) {
1887 rcu_read_lock();
1888 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1889 rcu_read_unlock();
1890 }
1891 if (ksession) {
1892 nb_chan += ksession->channel_count;
1893 }
1894 if (!nb_chan) {
1895 ret = LTTNG_ERR_NO_CHANNEL;
1896 goto error;
1897 }
1898
1899 /* Kernel tracing */
1900 if (ksession != NULL) {
1901 ret = start_kernel_session(ksession, kernel_tracer_fd);
1902 if (ret != LTTNG_OK) {
1903 goto error;
1904 }
1905 }
1906
1907 /* Flag session that trace should start automatically */
1908 if (usess) {
1909 /*
1910 * Even though the start trace might fail, flag this session active so
1911 * other application coming in are started by default.
1912 */
1913 usess->active = 1;
1914
1915 ret = ust_app_start_trace_all(usess);
1916 if (ret < 0) {
1917 ret = LTTNG_ERR_UST_START_FAIL;
1918 goto error;
1919 }
1920 }
1921
1922 /* Flag this after a successful start. */
1923 session->has_been_started = 1;
1924 session->active = 1;
1925
1926 ret = LTTNG_OK;
1927
1928 error:
1929 return ret;
1930 }
1931
1932 /*
1933 * Command LTTNG_STOP_TRACE processed by the client thread.
1934 */
1935 int cmd_stop_trace(struct ltt_session *session)
1936 {
1937 int ret;
1938 struct ltt_kernel_channel *kchan;
1939 struct ltt_kernel_session *ksession;
1940 struct ltt_ust_session *usess;
1941
1942 assert(session);
1943
1944 /* Short cut */
1945 ksession = session->kernel_session;
1946 usess = session->ust_session;
1947
1948 /* Session is not active. Skip everythong and inform the client. */
1949 if (!session->active) {
1950 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1951 goto error;
1952 }
1953
1954 /* Kernel tracer */
1955 if (ksession && ksession->active) {
1956 DBG("Stop kernel tracing");
1957
1958 /* Flush metadata if exist */
1959 if (ksession->metadata_stream_fd >= 0) {
1960 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1961 if (ret < 0) {
1962 ERR("Kernel metadata flush failed");
1963 }
1964 }
1965
1966 /* Flush all buffers before stopping */
1967 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1968 ret = kernel_flush_buffer(kchan);
1969 if (ret < 0) {
1970 ERR("Kernel flush buffer error");
1971 }
1972 }
1973
1974 ret = kernel_stop_session(ksession);
1975 if (ret < 0) {
1976 ret = LTTNG_ERR_KERN_STOP_FAIL;
1977 goto error;
1978 }
1979
1980 kernel_wait_quiescent(kernel_tracer_fd);
1981
1982 ksession->active = 0;
1983 }
1984
1985 if (usess && usess->active) {
1986 /*
1987 * Even though the stop trace might fail, flag this session inactive so
1988 * other application coming in are not started by default.
1989 */
1990 usess->active = 0;
1991
1992 ret = ust_app_stop_trace_all(usess);
1993 if (ret < 0) {
1994 ret = LTTNG_ERR_UST_STOP_FAIL;
1995 goto error;
1996 }
1997 }
1998
1999 /* Flag inactive after a successful stop. */
2000 session->active = 0;
2001 ret = LTTNG_OK;
2002
2003 error:
2004 return ret;
2005 }
2006
2007 /*
2008 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2009 */
2010 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
2011 size_t nb_uri, struct lttng_uri *uris)
2012 {
2013 int ret, i;
2014 struct ltt_kernel_session *ksess = session->kernel_session;
2015 struct ltt_ust_session *usess = session->ust_session;
2016 struct consumer_output *consumer = NULL;
2017
2018 assert(session);
2019 assert(uris);
2020 assert(nb_uri > 0);
2021
2022 /* Can't set consumer URI if the session is active. */
2023 if (session->active) {
2024 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2025 goto error;
2026 }
2027
2028 /*
2029 * This case switch makes sure the domain session has a temporary consumer
2030 * so the URL can be set.
2031 */
2032 switch (domain) {
2033 case 0:
2034 /* Code flow error. A session MUST always have a consumer object */
2035 assert(session->consumer);
2036 /*
2037 * The URL will be added to the tracing session consumer instead of a
2038 * specific domain consumer.
2039 */
2040 consumer = session->consumer;
2041 break;
2042 case LTTNG_DOMAIN_KERNEL:
2043 /* Code flow error if we don't have a kernel session here. */
2044 assert(ksess);
2045 assert(ksess->consumer);
2046 consumer = ksess->consumer;
2047 break;
2048 case LTTNG_DOMAIN_UST:
2049 /* Code flow error if we don't have a kernel session here. */
2050 assert(usess);
2051 assert(usess->consumer);
2052 consumer = usess->consumer;
2053 break;
2054 }
2055
2056 for (i = 0; i < nb_uri; i++) {
2057 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
2058 if (ret != LTTNG_OK) {
2059 goto error;
2060 }
2061 }
2062
2063 /*
2064 * Make sure to set the session in output mode after we set URI since a
2065 * session can be created without URL (thus flagged in no output mode).
2066 */
2067 session->output_traces = 1;
2068 if (ksess) {
2069 ksess->output_traces = 1;
2070 } else if (usess) {
2071 usess->output_traces = 1;
2072 }
2073
2074 /* All good! */
2075 ret = LTTNG_OK;
2076
2077 error:
2078 return ret;
2079 }
2080
2081 /*
2082 * Command LTTNG_CREATE_SESSION processed by the client thread.
2083 */
2084 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2085 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2086 {
2087 int ret;
2088 struct ltt_session *session;
2089
2090 assert(name);
2091 assert(creds);
2092
2093 /*
2094 * Verify if the session already exist
2095 *
2096 * XXX: There is no need for the session lock list here since the caller
2097 * (process_client_msg) is holding it. We might want to change that so a
2098 * single command does not lock the entire session list.
2099 */
2100 session = session_find_by_name(name);
2101 if (session != NULL) {
2102 ret = LTTNG_ERR_EXIST_SESS;
2103 goto find_error;
2104 }
2105
2106 /* Create tracing session in the registry */
2107 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2108 LTTNG_SOCK_GET_GID_CRED(creds));
2109 if (ret != LTTNG_OK) {
2110 goto session_error;
2111 }
2112
2113 /*
2114 * Get the newly created session pointer back
2115 *
2116 * XXX: There is no need for the session lock list here since the caller
2117 * (process_client_msg) is holding it. We might want to change that so a
2118 * single command does not lock the entire session list.
2119 */
2120 session = session_find_by_name(name);
2121 assert(session);
2122
2123 session->live_timer = live_timer;
2124 /* Create default consumer output for the session not yet created. */
2125 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2126 if (session->consumer == NULL) {
2127 ret = LTTNG_ERR_FATAL;
2128 goto consumer_error;
2129 }
2130
2131 if (uris) {
2132 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
2133 if (ret != LTTNG_OK) {
2134 goto consumer_error;
2135 }
2136 session->output_traces = 1;
2137 } else {
2138 session->output_traces = 0;
2139 DBG2("Session %s created with no output", session->name);
2140 }
2141
2142 session->consumer->enabled = 1;
2143
2144 return LTTNG_OK;
2145
2146 consumer_error:
2147 session_destroy(session);
2148 session_error:
2149 find_error:
2150 return ret;
2151 }
2152
2153 /*
2154 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2155 */
2156 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2157 size_t nb_uri, lttng_sock_cred *creds)
2158 {
2159 int ret;
2160 struct ltt_session *session;
2161 struct snapshot_output *new_output = NULL;
2162
2163 assert(name);
2164 assert(creds);
2165
2166 /*
2167 * Create session in no output mode with URIs set to NULL. The uris we've
2168 * received are for a default snapshot output if one.
2169 */
2170 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2171 if (ret != LTTNG_OK) {
2172 goto error;
2173 }
2174
2175 /* Get the newly created session pointer back. This should NEVER fail. */
2176 session = session_find_by_name(name);
2177 assert(session);
2178
2179 /* Flag session for snapshot mode. */
2180 session->snapshot_mode = 1;
2181
2182 /* Skip snapshot output creation if no URI is given. */
2183 if (nb_uri == 0) {
2184 goto end;
2185 }
2186
2187 new_output = snapshot_output_alloc();
2188 if (!new_output) {
2189 ret = LTTNG_ERR_NOMEM;
2190 goto error_snapshot_alloc;
2191 }
2192
2193 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2194 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2195 if (ret < 0) {
2196 if (ret == -ENOMEM) {
2197 ret = LTTNG_ERR_NOMEM;
2198 } else {
2199 ret = LTTNG_ERR_INVALID;
2200 }
2201 goto error_snapshot;
2202 }
2203
2204 rcu_read_lock();
2205 snapshot_add_output(&session->snapshot, new_output);
2206 rcu_read_unlock();
2207
2208 end:
2209 return LTTNG_OK;
2210
2211 error_snapshot:
2212 snapshot_output_destroy(new_output);
2213 error_snapshot_alloc:
2214 session_destroy(session);
2215 error:
2216 return ret;
2217 }
2218
2219 /*
2220 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2221 */
2222 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2223 {
2224 int ret;
2225 struct ltt_ust_session *usess;
2226 struct ltt_kernel_session *ksess;
2227
2228 /* Safety net */
2229 assert(session);
2230
2231 usess = session->ust_session;
2232 ksess = session->kernel_session;
2233
2234 /* Clean kernel session teardown */
2235 kernel_destroy_session(ksess);
2236
2237 /* UST session teardown */
2238 if (usess) {
2239 /* Close any relayd session */
2240 consumer_output_send_destroy_relayd(usess->consumer);
2241
2242 /* Destroy every UST application related to this session. */
2243 ret = ust_app_destroy_trace_all(usess);
2244 if (ret) {
2245 ERR("Error in ust_app_destroy_trace_all");
2246 }
2247
2248 /* Clean up the rest. */
2249 trace_ust_destroy_session(usess);
2250 }
2251
2252 /*
2253 * Must notify the kernel thread here to update it's poll set in order to
2254 * remove the channel(s)' fd just destroyed.
2255 */
2256 ret = notify_thread_pipe(wpipe);
2257 if (ret < 0) {
2258 PERROR("write kernel poll pipe");
2259 }
2260
2261 ret = session_destroy(session);
2262
2263 return ret;
2264 }
2265
2266 /*
2267 * Command LTTNG_CALIBRATE processed by the client thread.
2268 */
2269 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2270 {
2271 int ret;
2272
2273 switch (domain) {
2274 case LTTNG_DOMAIN_KERNEL:
2275 {
2276 struct lttng_kernel_calibrate kcalibrate;
2277
2278 switch (calibrate->type) {
2279 case LTTNG_CALIBRATE_FUNCTION:
2280 default:
2281 /* Default and only possible calibrate option. */
2282 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2283 break;
2284 }
2285
2286 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2287 if (ret < 0) {
2288 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2289 goto error;
2290 }
2291 break;
2292 }
2293 case LTTNG_DOMAIN_UST:
2294 {
2295 struct lttng_ust_calibrate ucalibrate;
2296
2297 switch (calibrate->type) {
2298 case LTTNG_CALIBRATE_FUNCTION:
2299 default:
2300 /* Default and only possible calibrate option. */
2301 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2302 break;
2303 }
2304
2305 ret = ust_app_calibrate_glb(&ucalibrate);
2306 if (ret < 0) {
2307 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2308 goto error;
2309 }
2310 break;
2311 }
2312 default:
2313 ret = LTTNG_ERR_UND;
2314 goto error;
2315 }
2316
2317 ret = LTTNG_OK;
2318
2319 error:
2320 return ret;
2321 }
2322
2323 /*
2324 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2325 */
2326 int cmd_register_consumer(struct ltt_session *session, int domain,
2327 const char *sock_path, struct consumer_data *cdata)
2328 {
2329 int ret, sock;
2330 struct consumer_socket *socket = NULL;
2331
2332 assert(session);
2333 assert(cdata);
2334 assert(sock_path);
2335
2336 switch (domain) {
2337 case LTTNG_DOMAIN_KERNEL:
2338 {
2339 struct ltt_kernel_session *ksess = session->kernel_session;
2340
2341 assert(ksess);
2342
2343 /* Can't register a consumer if there is already one */
2344 if (ksess->consumer_fds_sent != 0) {
2345 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2346 goto error;
2347 }
2348
2349 sock = lttcomm_connect_unix_sock(sock_path);
2350 if (sock < 0) {
2351 ret = LTTNG_ERR_CONNECT_FAIL;
2352 goto error;
2353 }
2354 cdata->cmd_sock = sock;
2355
2356 socket = consumer_allocate_socket(&cdata->cmd_sock);
2357 if (socket == NULL) {
2358 ret = close(sock);
2359 if (ret < 0) {
2360 PERROR("close register consumer");
2361 }
2362 cdata->cmd_sock = -1;
2363 ret = LTTNG_ERR_FATAL;
2364 goto error;
2365 }
2366
2367 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2368 if (socket->lock == NULL) {
2369 PERROR("zmalloc pthread mutex");
2370 ret = LTTNG_ERR_FATAL;
2371 goto error;
2372 }
2373 pthread_mutex_init(socket->lock, NULL);
2374 socket->registered = 1;
2375
2376 rcu_read_lock();
2377 consumer_add_socket(socket, ksess->consumer);
2378 rcu_read_unlock();
2379
2380 pthread_mutex_lock(&cdata->pid_mutex);
2381 cdata->pid = -1;
2382 pthread_mutex_unlock(&cdata->pid_mutex);
2383
2384 break;
2385 }
2386 default:
2387 /* TODO: Userspace tracing */
2388 ret = LTTNG_ERR_UND;
2389 goto error;
2390 }
2391
2392 return LTTNG_OK;
2393
2394 error:
2395 if (socket) {
2396 consumer_destroy_socket(socket);
2397 }
2398 return ret;
2399 }
2400
2401 /*
2402 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2403 */
2404 ssize_t cmd_list_domains(struct ltt_session *session,
2405 struct lttng_domain **domains)
2406 {
2407 int ret, index = 0;
2408 ssize_t nb_dom = 0;
2409 struct agent *agt;
2410 struct lttng_ht_iter iter;
2411
2412 if (session->kernel_session != NULL) {
2413 DBG3("Listing domains found kernel domain");
2414 nb_dom++;
2415 }
2416
2417 if (session->ust_session != NULL) {
2418 DBG3("Listing domains found UST global domain");
2419 nb_dom++;
2420
2421 rcu_read_lock();
2422 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2423 agt, node.node) {
2424 if (agt->being_used) {
2425 nb_dom++;
2426 }
2427 }
2428 rcu_read_unlock();
2429 }
2430
2431 if (!nb_dom) {
2432 goto end;
2433 }
2434
2435 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2436 if (*domains == NULL) {
2437 ret = LTTNG_ERR_FATAL;
2438 goto error;
2439 }
2440
2441 if (session->kernel_session != NULL) {
2442 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2443 index++;
2444 }
2445
2446 if (session->ust_session != NULL) {
2447 (*domains)[index].type = LTTNG_DOMAIN_UST;
2448 (*domains)[index].buf_type = session->ust_session->buffer_type;
2449 index++;
2450
2451 rcu_read_lock();
2452 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2453 agt, node.node) {
2454 if (agt->being_used) {
2455 (*domains)[index].type = agt->domain;
2456 (*domains)[index].buf_type = session->ust_session->buffer_type;
2457 index++;
2458 }
2459 }
2460 rcu_read_unlock();
2461 }
2462 end:
2463 return nb_dom;
2464
2465 error:
2466 /* Return negative value to differentiate return code */
2467 return -ret;
2468 }
2469
2470
2471 /*
2472 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2473 */
2474 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2475 struct lttng_channel **channels)
2476 {
2477 int ret;
2478 ssize_t nb_chan = 0;
2479
2480 switch (domain) {
2481 case LTTNG_DOMAIN_KERNEL:
2482 if (session->kernel_session != NULL) {
2483 nb_chan = session->kernel_session->channel_count;
2484 }
2485 DBG3("Number of kernel channels %zd", nb_chan);
2486 if (nb_chan <= 0) {
2487 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2488 }
2489 break;
2490 case LTTNG_DOMAIN_UST:
2491 if (session->ust_session != NULL) {
2492 rcu_read_lock();
2493 nb_chan = lttng_ht_get_count(
2494 session->ust_session->domain_global.channels);
2495 rcu_read_unlock();
2496 }
2497 DBG3("Number of UST global channels %zd", nb_chan);
2498 if (nb_chan < 0) {
2499 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2500 goto error;
2501 }
2502 break;
2503 default:
2504 ret = LTTNG_ERR_UND;
2505 goto error;
2506 }
2507
2508 if (nb_chan > 0) {
2509 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2510 if (*channels == NULL) {
2511 ret = LTTNG_ERR_FATAL;
2512 goto error;
2513 }
2514
2515 list_lttng_channels(domain, session, *channels);
2516 }
2517
2518 return nb_chan;
2519
2520 error:
2521 /* Return negative value to differentiate return code */
2522 return -ret;
2523 }
2524
2525 /*
2526 * Command LTTNG_LIST_EVENTS processed by the client thread.
2527 */
2528 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2529 char *channel_name, struct lttng_event **events)
2530 {
2531 int ret = 0;
2532 ssize_t nb_event = 0;
2533
2534 switch (domain) {
2535 case LTTNG_DOMAIN_KERNEL:
2536 if (session->kernel_session != NULL) {
2537 nb_event = list_lttng_kernel_events(channel_name,
2538 session->kernel_session, events);
2539 }
2540 break;
2541 case LTTNG_DOMAIN_UST:
2542 {
2543 if (session->ust_session != NULL) {
2544 nb_event = list_lttng_ust_global_events(channel_name,
2545 &session->ust_session->domain_global, events);
2546 }
2547 break;
2548 }
2549 case LTTNG_DOMAIN_LOG4J:
2550 case LTTNG_DOMAIN_JUL:
2551 case LTTNG_DOMAIN_PYTHON:
2552 if (session->ust_session) {
2553 struct lttng_ht_iter iter;
2554 struct agent *agt;
2555
2556 rcu_read_lock();
2557 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2558 &iter.iter, agt, node.node) {
2559 nb_event = list_lttng_agent_events(agt, events);
2560 }
2561 rcu_read_unlock();
2562 }
2563 break;
2564 default:
2565 ret = LTTNG_ERR_UND;
2566 goto error;
2567 }
2568
2569 return nb_event;
2570
2571 error:
2572 /* Return negative value to differentiate return code */
2573 return -ret;
2574 }
2575
2576 /*
2577 * Using the session list, filled a lttng_session array to send back to the
2578 * client for session listing.
2579 *
2580 * The session list lock MUST be acquired before calling this function. Use
2581 * session_lock_list() and session_unlock_list().
2582 */
2583 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2584 gid_t gid)
2585 {
2586 int ret;
2587 unsigned int i = 0;
2588 struct ltt_session *session;
2589 struct ltt_session_list *list = session_get_list();
2590
2591 DBG("Getting all available session for UID %d GID %d",
2592 uid, gid);
2593 /*
2594 * Iterate over session list and append data after the control struct in
2595 * the buffer.
2596 */
2597 cds_list_for_each_entry(session, &list->head, list) {
2598 /*
2599 * Only list the sessions the user can control.
2600 */
2601 if (!session_access_ok(session, uid, gid)) {
2602 continue;
2603 }
2604
2605 struct ltt_kernel_session *ksess = session->kernel_session;
2606 struct ltt_ust_session *usess = session->ust_session;
2607
2608 if (session->consumer->type == CONSUMER_DST_NET ||
2609 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2610 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2611 ret = build_network_session_path(sessions[i].path,
2612 sizeof(sessions[i].path), session);
2613 } else {
2614 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2615 session->consumer->dst.trace_path);
2616 }
2617 if (ret < 0) {
2618 PERROR("snprintf session path");
2619 continue;
2620 }
2621
2622 strncpy(sessions[i].name, session->name, NAME_MAX);
2623 sessions[i].name[NAME_MAX - 1] = '\0';
2624 sessions[i].enabled = session->active;
2625 sessions[i].snapshot_mode = session->snapshot_mode;
2626 sessions[i].live_timer_interval = session->live_timer;
2627 i++;
2628 }
2629 }
2630
2631 /*
2632 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2633 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2634 */
2635 int cmd_data_pending(struct ltt_session *session)
2636 {
2637 int ret;
2638 struct ltt_kernel_session *ksess = session->kernel_session;
2639 struct ltt_ust_session *usess = session->ust_session;
2640
2641 assert(session);
2642
2643 /* Session MUST be stopped to ask for data availability. */
2644 if (session->active) {
2645 ret = LTTNG_ERR_SESSION_STARTED;
2646 goto error;
2647 } else {
2648 /*
2649 * If stopped, just make sure we've started before else the above call
2650 * will always send that there is data pending.
2651 *
2652 * The consumer assumes that when the data pending command is received,
2653 * the trace has been started before or else no output data is written
2654 * by the streams which is a condition for data pending. So, this is
2655 * *VERY* important that we don't ask the consumer before a start
2656 * trace.
2657 */
2658 if (!session->has_been_started) {
2659 ret = 0;
2660 goto error;
2661 }
2662 }
2663
2664 if (ksess && ksess->consumer) {
2665 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2666 if (ret == 1) {
2667 /* Data is still being extracted for the kernel. */
2668 goto error;
2669 }
2670 }
2671
2672 if (usess && usess->consumer) {
2673 ret = consumer_is_data_pending(usess->id, usess->consumer);
2674 if (ret == 1) {
2675 /* Data is still being extracted for the kernel. */
2676 goto error;
2677 }
2678 }
2679
2680 /* Data is ready to be read by a viewer */
2681 ret = 0;
2682
2683 error:
2684 return ret;
2685 }
2686
2687 /*
2688 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2689 *
2690 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2691 */
2692 int cmd_snapshot_add_output(struct ltt_session *session,
2693 struct lttng_snapshot_output *output, uint32_t *id)
2694 {
2695 int ret;
2696 struct snapshot_output *new_output;
2697
2698 assert(session);
2699 assert(output);
2700
2701 DBG("Cmd snapshot add output for session %s", session->name);
2702
2703 /*
2704 * Permission denied to create an output if the session is not
2705 * set in no output mode.
2706 */
2707 if (session->output_traces) {
2708 ret = LTTNG_ERR_EPERM;
2709 goto error;
2710 }
2711
2712 /* Only one output is allowed until we have the "tee" feature. */
2713 if (session->snapshot.nb_output == 1) {
2714 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2715 goto error;
2716 }
2717
2718 new_output = snapshot_output_alloc();
2719 if (!new_output) {
2720 ret = LTTNG_ERR_NOMEM;
2721 goto error;
2722 }
2723
2724 ret = snapshot_output_init(output->max_size, output->name,
2725 output->ctrl_url, output->data_url, session->consumer, new_output,
2726 &session->snapshot);
2727 if (ret < 0) {
2728 if (ret == -ENOMEM) {
2729 ret = LTTNG_ERR_NOMEM;
2730 } else {
2731 ret = LTTNG_ERR_INVALID;
2732 }
2733 goto free_error;
2734 }
2735
2736 rcu_read_lock();
2737 snapshot_add_output(&session->snapshot, new_output);
2738 if (id) {
2739 *id = new_output->id;
2740 }
2741 rcu_read_unlock();
2742
2743 return LTTNG_OK;
2744
2745 free_error:
2746 snapshot_output_destroy(new_output);
2747 error:
2748 return ret;
2749 }
2750
2751 /*
2752 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2753 *
2754 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2755 */
2756 int cmd_snapshot_del_output(struct ltt_session *session,
2757 struct lttng_snapshot_output *output)
2758 {
2759 int ret;
2760 struct snapshot_output *sout = NULL;
2761
2762 assert(session);
2763 assert(output);
2764
2765 rcu_read_lock();
2766
2767 /*
2768 * Permission denied to create an output if the session is not
2769 * set in no output mode.
2770 */
2771 if (session->output_traces) {
2772 ret = LTTNG_ERR_EPERM;
2773 goto error;
2774 }
2775
2776 if (output->id) {
2777 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2778 session->name);
2779 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2780 } else if (*output->name != '\0') {
2781 DBG("Cmd snapshot del output name %s for session %s", output->name,
2782 session->name);
2783 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2784 }
2785 if (!sout) {
2786 ret = LTTNG_ERR_INVALID;
2787 goto error;
2788 }
2789
2790 snapshot_delete_output(&session->snapshot, sout);
2791 snapshot_output_destroy(sout);
2792 ret = LTTNG_OK;
2793
2794 error:
2795 rcu_read_unlock();
2796 return ret;
2797 }
2798
2799 /*
2800 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2801 *
2802 * If no output is available, outputs is untouched and 0 is returned.
2803 *
2804 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2805 */
2806 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2807 struct lttng_snapshot_output **outputs)
2808 {
2809 int ret, idx = 0;
2810 struct lttng_snapshot_output *list = NULL;
2811 struct lttng_ht_iter iter;
2812 struct snapshot_output *output;
2813
2814 assert(session);
2815 assert(outputs);
2816
2817 DBG("Cmd snapshot list outputs for session %s", session->name);
2818
2819 /*
2820 * Permission denied to create an output if the session is not
2821 * set in no output mode.
2822 */
2823 if (session->output_traces) {
2824 ret = -LTTNG_ERR_EPERM;
2825 goto error;
2826 }
2827
2828 if (session->snapshot.nb_output == 0) {
2829 ret = 0;
2830 goto error;
2831 }
2832
2833 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2834 if (!list) {
2835 ret = -LTTNG_ERR_NOMEM;
2836 goto error;
2837 }
2838
2839 /* Copy list from session to the new list object. */
2840 rcu_read_lock();
2841 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2842 output, node.node) {
2843 assert(output->consumer);
2844 list[idx].id = output->id;
2845 list[idx].max_size = output->max_size;
2846 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2847 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2848 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2849 sizeof(list[idx].ctrl_url));
2850 } else {
2851 /* Control URI. */
2852 ret = uri_to_str_url(&output->consumer->dst.net.control,
2853 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2854 if (ret < 0) {
2855 ret = -LTTNG_ERR_NOMEM;
2856 goto error;
2857 }
2858
2859 /* Data URI. */
2860 ret = uri_to_str_url(&output->consumer->dst.net.data,
2861 list[idx].data_url, sizeof(list[idx].data_url));
2862 if (ret < 0) {
2863 ret = -LTTNG_ERR_NOMEM;
2864 goto error;
2865 }
2866 }
2867 idx++;
2868 }
2869
2870 *outputs = list;
2871 list = NULL;
2872 ret = session->snapshot.nb_output;
2873 error:
2874 free(list);
2875 rcu_read_unlock();
2876 return ret;
2877 }
2878
2879 /*
2880 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2881 * snapshot output is *not* set with a remote destination.
2882 *
2883 * Return 0 on success or a LTTNG_ERR code.
2884 */
2885 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2886 struct snapshot_output *snap_output, struct ltt_session *session)
2887 {
2888 int ret = LTTNG_OK;
2889 struct lttng_ht_iter iter;
2890 struct consumer_socket *socket;
2891
2892 assert(consumer);
2893 assert(snap_output);
2894 assert(session);
2895
2896 DBG2("Set relayd object from snapshot output");
2897
2898 /* Ignore if snapshot consumer output is not network. */
2899 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2900 goto error;
2901 }
2902
2903 /*
2904 * For each consumer socket, create and send the relayd object of the
2905 * snapshot output.
2906 */
2907 rcu_read_lock();
2908 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2909 socket, node.node) {
2910 ret = send_consumer_relayd_sockets(0, session->id,
2911 snap_output->consumer, socket,
2912 session->name, session->hostname,
2913 session->live_timer);
2914 if (ret != LTTNG_OK) {
2915 rcu_read_unlock();
2916 goto error;
2917 }
2918 }
2919 rcu_read_unlock();
2920
2921 error:
2922 return ret;
2923 }
2924
2925 /*
2926 * Record a kernel snapshot.
2927 *
2928 * Return LTTNG_OK on success or a LTTNG_ERR code.
2929 */
2930 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2931 struct snapshot_output *output, struct ltt_session *session,
2932 int wait, uint64_t max_stream_size)
2933 {
2934 int ret;
2935
2936 assert(ksess);
2937 assert(output);
2938 assert(session);
2939
2940 /* Get the datetime for the snapshot output directory. */
2941 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2942 sizeof(output->datetime));
2943 if (!ret) {
2944 ret = LTTNG_ERR_INVALID;
2945 goto error;
2946 }
2947
2948 /*
2949 * Copy kernel session sockets so we can communicate with the right
2950 * consumer for the snapshot record command.
2951 */
2952 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2953 if (ret < 0) {
2954 ret = LTTNG_ERR_NOMEM;
2955 goto error;
2956 }
2957
2958 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2959 if (ret != LTTNG_OK) {
2960 goto error_snapshot;
2961 }
2962
2963 ret = kernel_snapshot_record(ksess, output, wait, max_stream_size);
2964 if (ret != LTTNG_OK) {
2965 goto error_snapshot;
2966 }
2967
2968 ret = LTTNG_OK;
2969
2970 error_snapshot:
2971 /* Clean up copied sockets so this output can use some other later on. */
2972 consumer_destroy_output_sockets(output->consumer);
2973 error:
2974 return ret;
2975 }
2976
2977 /*
2978 * Record a UST snapshot.
2979 *
2980 * Return 0 on success or a LTTNG_ERR error code.
2981 */
2982 static int record_ust_snapshot(struct ltt_ust_session *usess,
2983 struct snapshot_output *output, struct ltt_session *session,
2984 int wait, uint64_t max_stream_size)
2985 {
2986 int ret;
2987
2988 assert(usess);
2989 assert(output);
2990 assert(session);
2991
2992 /* Get the datetime for the snapshot output directory. */
2993 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2994 sizeof(output->datetime));
2995 if (!ret) {
2996 ret = LTTNG_ERR_INVALID;
2997 goto error;
2998 }
2999
3000 /*
3001 * Copy UST session sockets so we can communicate with the right
3002 * consumer for the snapshot record command.
3003 */
3004 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3005 if (ret < 0) {
3006 ret = LTTNG_ERR_NOMEM;
3007 goto error;
3008 }
3009
3010 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3011 if (ret != LTTNG_OK) {
3012 goto error_snapshot;
3013 }
3014
3015 ret = ust_app_snapshot_record(usess, output, wait, max_stream_size);
3016 if (ret < 0) {
3017 switch (-ret) {
3018 case EINVAL:
3019 ret = LTTNG_ERR_INVALID;
3020 break;
3021 case ENODATA:
3022 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3023 break;
3024 default:
3025 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3026 break;
3027 }
3028 goto error_snapshot;
3029 }
3030
3031 ret = LTTNG_OK;
3032
3033 error_snapshot:
3034 /* Clean up copied sockets so this output can use some other later on. */
3035 consumer_destroy_output_sockets(output->consumer);
3036 error:
3037 return ret;
3038 }
3039
3040 /*
3041 * Return the biggest subbuffer size of all channels in the given session.
3042 */
3043 static uint64_t get_session_max_subbuf_size(struct ltt_session *session)
3044 {
3045 uint64_t max_size = 0;
3046
3047 assert(session);
3048
3049 if (session->kernel_session) {
3050 struct ltt_kernel_channel *chan;
3051 struct ltt_kernel_session *ksess = session->kernel_session;
3052
3053 /*
3054 * For each channel, add to the max size the size of each subbuffer
3055 * multiplied by their sized.
3056 */
3057 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3058 if (chan->channel->attr.subbuf_size > max_size) {
3059 max_size = chan->channel->attr.subbuf_size;
3060 }
3061 }
3062 }
3063
3064 if (session->ust_session) {
3065 struct lttng_ht_iter iter;
3066 struct ltt_ust_channel *uchan;
3067 struct ltt_ust_session *usess = session->ust_session;
3068
3069 rcu_read_lock();
3070 cds_lfht_for_each_entry(usess->domain_global.channels->ht, &iter.iter,
3071 uchan, node.node) {
3072 if (uchan->attr.subbuf_size > max_size) {
3073 max_size = uchan->attr.subbuf_size;
3074 }
3075 }
3076 rcu_read_unlock();
3077 }
3078
3079 return max_size;
3080 }
3081
3082 /*
3083 * Returns the total number of streams for a session or a negative value
3084 * on error.
3085 */
3086 static unsigned int get_session_nb_streams(struct ltt_session *session)
3087 {
3088 unsigned int total_streams = 0;
3089
3090 if (session->kernel_session) {
3091 struct ltt_kernel_session *ksess = session->kernel_session;
3092
3093 total_streams += ksess->stream_count_global;
3094 }
3095
3096 if (session->ust_session) {
3097 struct ltt_ust_session *usess = session->ust_session;
3098
3099 total_streams += ust_app_get_nb_stream(usess);
3100 }
3101
3102 return total_streams;
3103 }
3104
3105 /*
3106 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3107 *
3108 * The wait parameter is ignored so this call always wait for the snapshot to
3109 * complete before returning.
3110 *
3111 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3112 */
3113 int cmd_snapshot_record(struct ltt_session *session,
3114 struct lttng_snapshot_output *output, int wait)
3115 {
3116 int ret = LTTNG_OK;
3117 unsigned int use_tmp_output = 0;
3118 struct snapshot_output tmp_output;
3119 unsigned int nb_streams, snapshot_success = 0;
3120 uint64_t session_max_size = 0, max_stream_size = 0;
3121
3122 assert(session);
3123 assert(output);
3124
3125 DBG("Cmd snapshot record for session %s", session->name);
3126
3127 /*
3128 * Permission denied to create an output if the session is not
3129 * set in no output mode.
3130 */
3131 if (session->output_traces) {
3132 ret = LTTNG_ERR_EPERM;
3133 goto error;
3134 }
3135
3136 /* The session needs to be started at least once. */
3137 if (!session->has_been_started) {
3138 ret = LTTNG_ERR_START_SESSION_ONCE;
3139 goto error;
3140 }
3141
3142 /* Use temporary output for the session. */
3143 if (*output->ctrl_url != '\0') {
3144 ret = snapshot_output_init(output->max_size, output->name,
3145 output->ctrl_url, output->data_url, session->consumer,
3146 &tmp_output, NULL);
3147 if (ret < 0) {
3148 if (ret == -ENOMEM) {
3149 ret = LTTNG_ERR_NOMEM;
3150 } else {
3151 ret = LTTNG_ERR_INVALID;
3152 }
3153 goto error;
3154 }
3155 /* Use the global session count for the temporary snapshot. */
3156 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3157 use_tmp_output = 1;
3158 }
3159
3160 /*
3161 * Get the session maximum size for a snapshot meaning it will compute the
3162 * size of all streams from all domain.
3163 */
3164 max_stream_size = get_session_max_subbuf_size(session);
3165
3166 nb_streams = get_session_nb_streams(session);
3167 if (nb_streams) {
3168 /*
3169 * The maximum size of the snapshot is the number of streams multiplied
3170 * by the biggest subbuf size of all channels in a session which is the
3171 * maximum stream size available for each stream. The session max size
3172 * is now checked against the snapshot max size value given by the user
3173 * and if lower, an error is returned.
3174 */
3175 session_max_size = max_stream_size * nb_streams;
3176 }
3177
3178 DBG3("Snapshot max size is %" PRIu64 " for max stream size of %" PRIu64,
3179 session_max_size, max_stream_size);
3180
3181 /*
3182 * If we use a temporary output, check right away if the max size fits else
3183 * for each output the max size will be checked.
3184 */
3185 if (use_tmp_output &&
3186 (tmp_output.max_size != 0 &&
3187 tmp_output.max_size < session_max_size)) {
3188 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3189 goto error;
3190 }
3191
3192 if (session->kernel_session) {
3193 struct ltt_kernel_session *ksess = session->kernel_session;
3194
3195 if (use_tmp_output) {
3196 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3197 wait, max_stream_size);
3198 if (ret != LTTNG_OK) {
3199 goto error;
3200 }
3201 snapshot_success = 1;
3202 } else {
3203 struct snapshot_output *sout;
3204 struct lttng_ht_iter iter;
3205
3206 rcu_read_lock();
3207 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3208 &iter.iter, sout, node.node) {
3209 /*
3210 * Make a local copy of the output and assign the possible
3211 * temporary value given by the caller.
3212 */
3213 memset(&tmp_output, 0, sizeof(tmp_output));
3214 memcpy(&tmp_output, sout, sizeof(tmp_output));
3215
3216 /* Use temporary max size. */
3217 if (output->max_size != (uint64_t) -1ULL) {
3218 tmp_output.max_size = output->max_size;
3219 }
3220
3221 if (tmp_output.max_size != 0 &&
3222 tmp_output.max_size < session_max_size) {
3223 rcu_read_unlock();
3224 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3225 goto error;
3226 }
3227
3228 /* Use temporary name. */
3229 if (*output->name != '\0') {
3230 strncpy(tmp_output.name, output->name,
3231 sizeof(tmp_output.name));
3232 }
3233
3234 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3235
3236 ret = record_kernel_snapshot(ksess, &tmp_output,
3237 session, wait, max_stream_size);
3238 if (ret != LTTNG_OK) {
3239 rcu_read_unlock();
3240 goto error;
3241 }
3242 snapshot_success = 1;
3243 }
3244 rcu_read_unlock();
3245 }
3246 }
3247
3248 if (session->ust_session) {
3249 struct ltt_ust_session *usess = session->ust_session;
3250
3251 if (use_tmp_output) {
3252 ret = record_ust_snapshot(usess, &tmp_output, session,
3253 wait, max_stream_size);
3254 if (ret != LTTNG_OK) {
3255 goto error;
3256 }
3257 snapshot_success = 1;
3258 } else {
3259 struct snapshot_output *sout;
3260 struct lttng_ht_iter iter;
3261
3262 rcu_read_lock();
3263 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3264 &iter.iter, sout, node.node) {
3265 /*
3266 * Make a local copy of the output and assign the possible
3267 * temporary value given by the caller.
3268 */
3269 memset(&tmp_output, 0, sizeof(tmp_output));
3270 memcpy(&tmp_output, sout, sizeof(tmp_output));
3271
3272 /* Use temporary max size. */
3273 if (output->max_size != (uint64_t) -1ULL) {
3274 tmp_output.max_size = output->max_size;
3275 }
3276
3277 if (tmp_output.max_size != 0 &&
3278 tmp_output.max_size < session_max_size) {
3279 rcu_read_unlock();
3280 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3281 goto error;
3282 }
3283
3284 /* Use temporary name. */
3285 if (*output->name != '\0') {
3286 strncpy(tmp_output.name, output->name,
3287 sizeof(tmp_output.name));
3288 }
3289
3290 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3291
3292 ret = record_ust_snapshot(usess, &tmp_output, session,
3293 wait, max_stream_size);
3294 if (ret != LTTNG_OK) {
3295 rcu_read_unlock();
3296 goto error;
3297 }
3298 snapshot_success = 1;
3299 }
3300 rcu_read_unlock();
3301 }
3302 }
3303
3304 if (snapshot_success) {
3305 session->snapshot.nb_snapshot++;
3306 } else {
3307 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3308 }
3309
3310 error:
3311 return ret;
3312 }
3313
3314 /*
3315 * Init command subsystem.
3316 */
3317 void cmd_init(void)
3318 {
3319 /*
3320 * Set network sequence index to 1 for streams to match a relayd
3321 * socket on the consumer side.
3322 */
3323 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3324 relayd_net_seq_idx = 1;
3325 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3326
3327 DBG("Command subsystem initialized");
3328 }
LTTng 2.0 tools and control repository
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