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Deprecate enable/disable-consumer
[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 <urcu/list.h>
21 #include <urcu/uatomic.h>
22
23 #include <common/defaults.h>
24 #include <common/common.h>
25 #include <common/sessiond-comm/sessiond-comm.h>
26 #include <common/relayd/relayd.h>
27
28 #include "channel.h"
29 #include "consumer.h"
30 #include "event.h"
31 #include "kernel.h"
32 #include "kernel-consumer.h"
33 #include "lttng-sessiond.h"
34 #include "utils.h"
35
36 #include "cmd.h"
37
38 /*
39 * Used to keep a unique index for each relayd socket created where this value
40 * is associated with streams on the consumer so it can match the right relayd
41 * to send to.
42 *
43 * This value should be incremented atomically for safety purposes and future
44 * possible concurrent access.
45 */
46 static unsigned int relayd_net_seq_idx;
47
48 /*
49 * Create a session path used by list_lttng_sessions for the case that the
50 * session consumer is on the network.
51 */
52 static int build_network_session_path(char *dst, size_t size,
53 struct ltt_session *session)
54 {
55 int ret, kdata_port, udata_port;
56 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
57 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
58
59 assert(session);
60 assert(dst);
61
62 memset(tmp_urls, 0, sizeof(tmp_urls));
63 memset(tmp_uurl, 0, sizeof(tmp_uurl));
64
65 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
66
67 if (session->kernel_session && session->kernel_session->consumer) {
68 kuri = &session->kernel_session->consumer->dst.net.control;
69 kdata_port = session->kernel_session->consumer->dst.net.data.port;
70 }
71
72 if (session->ust_session && session->ust_session->consumer) {
73 uuri = &session->ust_session->consumer->dst.net.control;
74 udata_port = session->ust_session->consumer->dst.net.data.port;
75 }
76
77 if (uuri == NULL && kuri == NULL) {
78 uri = &session->consumer->dst.net.control;
79 kdata_port = session->consumer->dst.net.data.port;
80 } else if (kuri && uuri) {
81 ret = uri_compare(kuri, uuri);
82 if (ret) {
83 /* Not Equal */
84 uri = kuri;
85 /* Build uuri URL string */
86 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
87 if (ret < 0) {
88 goto error;
89 }
90 } else {
91 uri = kuri;
92 }
93 } else if (kuri && uuri == NULL) {
94 uri = kuri;
95 } else if (uuri && kuri == NULL) {
96 uri = uuri;
97 }
98
99 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
100 if (ret < 0) {
101 goto error;
102 }
103
104 /*
105 * Do we have a UST url set. If yes, this means we have both kernel and UST
106 * to print.
107 */
108 if (*tmp_uurl != '\0') {
109 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
110 tmp_urls, kdata_port, tmp_uurl, udata_port);
111 } else {
112 int dport;
113 if (kuri) {
114 dport = kdata_port;
115 } else {
116 /* No kernel URI, use the UST port. */
117 dport = udata_port;
118 }
119 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
120 }
121
122 error:
123 return ret;
124 }
125
126 /*
127 * Fill lttng_channel array of all channels.
128 */
129 static void list_lttng_channels(int domain, struct ltt_session *session,
130 struct lttng_channel *channels)
131 {
132 int i = 0;
133 struct ltt_kernel_channel *kchan;
134
135 DBG("Listing channels for session %s", session->name);
136
137 switch (domain) {
138 case LTTNG_DOMAIN_KERNEL:
139 /* Kernel channels */
140 if (session->kernel_session != NULL) {
141 cds_list_for_each_entry(kchan,
142 &session->kernel_session->channel_list.head, list) {
143 /* Copy lttng_channel struct to array */
144 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
145 channels[i].enabled = kchan->enabled;
146 i++;
147 }
148 }
149 break;
150 case LTTNG_DOMAIN_UST:
151 {
152 struct lttng_ht_iter iter;
153 struct ltt_ust_channel *uchan;
154
155 rcu_read_lock();
156 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
157 &iter.iter, uchan, node.node) {
158 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
159 channels[i].attr.overwrite = uchan->attr.overwrite;
160 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
161 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
162 channels[i].attr.switch_timer_interval =
163 uchan->attr.switch_timer_interval;
164 channels[i].attr.read_timer_interval =
165 uchan->attr.read_timer_interval;
166 channels[i].enabled = uchan->enabled;
167 switch (uchan->attr.output) {
168 case LTTNG_UST_MMAP:
169 default:
170 channels[i].attr.output = LTTNG_EVENT_MMAP;
171 break;
172 }
173 i++;
174 }
175 rcu_read_unlock();
176 break;
177 }
178 default:
179 break;
180 }
181 }
182
183 /*
184 * Create a list of ust global domain events.
185 */
186 static int list_lttng_ust_global_events(char *channel_name,
187 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
188 {
189 int i = 0, ret = 0;
190 unsigned int nb_event = 0;
191 struct lttng_ht_iter iter;
192 struct lttng_ht_node_str *node;
193 struct ltt_ust_channel *uchan;
194 struct ltt_ust_event *uevent;
195 struct lttng_event *tmp;
196
197 DBG("Listing UST global events for channel %s", channel_name);
198
199 rcu_read_lock();
200
201 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
202 node = lttng_ht_iter_get_node_str(&iter);
203 if (node == NULL) {
204 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
205 goto error;
206 }
207
208 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
209
210 nb_event += lttng_ht_get_count(uchan->events);
211
212 if (nb_event == 0) {
213 ret = nb_event;
214 goto error;
215 }
216
217 DBG3("Listing UST global %d events", nb_event);
218
219 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
220 if (tmp == NULL) {
221 ret = LTTNG_ERR_FATAL;
222 goto error;
223 }
224
225 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
226 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
227 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
228 tmp[i].enabled = uevent->enabled;
229
230 switch (uevent->attr.instrumentation) {
231 case LTTNG_UST_TRACEPOINT:
232 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
233 break;
234 case LTTNG_UST_PROBE:
235 tmp[i].type = LTTNG_EVENT_PROBE;
236 break;
237 case LTTNG_UST_FUNCTION:
238 tmp[i].type = LTTNG_EVENT_FUNCTION;
239 break;
240 }
241
242 tmp[i].loglevel = uevent->attr.loglevel;
243 switch (uevent->attr.loglevel_type) {
244 case LTTNG_UST_LOGLEVEL_ALL:
245 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
246 break;
247 case LTTNG_UST_LOGLEVEL_RANGE:
248 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
249 break;
250 case LTTNG_UST_LOGLEVEL_SINGLE:
251 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
252 break;
253 }
254 if (uevent->filter) {
255 tmp[i].filter = 1;
256 }
257 i++;
258 }
259
260 ret = nb_event;
261 *events = tmp;
262
263 error:
264 rcu_read_unlock();
265 return ret;
266 }
267
268 /*
269 * Fill lttng_event array of all kernel events in the channel.
270 */
271 static int list_lttng_kernel_events(char *channel_name,
272 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
273 {
274 int i = 0, ret;
275 unsigned int nb_event;
276 struct ltt_kernel_event *event;
277 struct ltt_kernel_channel *kchan;
278
279 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
280 if (kchan == NULL) {
281 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
282 goto error;
283 }
284
285 nb_event = kchan->event_count;
286
287 DBG("Listing events for channel %s", kchan->channel->name);
288
289 if (nb_event == 0) {
290 goto end;
291 }
292
293 *events = zmalloc(nb_event * sizeof(struct lttng_event));
294 if (*events == NULL) {
295 ret = LTTNG_ERR_FATAL;
296 goto error;
297 }
298
299 /* Kernel channels */
300 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
301 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
302 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
303 (*events)[i].enabled = event->enabled;
304
305 switch (event->event->instrumentation) {
306 case LTTNG_KERNEL_TRACEPOINT:
307 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
308 break;
309 case LTTNG_KERNEL_KPROBE:
310 case LTTNG_KERNEL_KRETPROBE:
311 (*events)[i].type = LTTNG_EVENT_PROBE;
312 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
313 sizeof(struct lttng_kernel_kprobe));
314 break;
315 case LTTNG_KERNEL_FUNCTION:
316 (*events)[i].type = LTTNG_EVENT_FUNCTION;
317 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
318 sizeof(struct lttng_kernel_function));
319 break;
320 case LTTNG_KERNEL_NOOP:
321 (*events)[i].type = LTTNG_EVENT_NOOP;
322 break;
323 case LTTNG_KERNEL_SYSCALL:
324 (*events)[i].type = LTTNG_EVENT_SYSCALL;
325 break;
326 case LTTNG_KERNEL_ALL:
327 assert(0);
328 break;
329 }
330 i++;
331 }
332
333 end:
334 return nb_event;
335
336 error:
337 /* Negate the error code to differentiate the size from an error */
338 return -ret;
339 }
340
341 /*
342 * Add URI so the consumer output object. Set the correct path depending on the
343 * domain adding the default trace directory.
344 */
345 static int add_uri_to_consumer(struct consumer_output *consumer,
346 struct lttng_uri *uri, int domain, const char *session_name)
347 {
348 int ret = LTTNG_OK;
349 const char *default_trace_dir;
350
351 assert(uri);
352
353 if (consumer == NULL) {
354 DBG("No consumer detected. Don't add URI. Stopping.");
355 ret = LTTNG_ERR_NO_CONSUMER;
356 goto error;
357 }
358
359 switch (domain) {
360 case LTTNG_DOMAIN_KERNEL:
361 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
362 break;
363 case LTTNG_DOMAIN_UST:
364 default_trace_dir = DEFAULT_UST_TRACE_DIR;
365 break;
366 default:
367 /*
368 * This case is possible is we try to add the URI to the global tracing
369 * session consumer object which in this case there is no subdir.
370 */
371 default_trace_dir = "";
372 }
373
374 switch (uri->dtype) {
375 case LTTNG_DST_IPV4:
376 case LTTNG_DST_IPV6:
377 DBG2("Setting network URI to consumer");
378
379 consumer->type = CONSUMER_DST_NET;
380
381 if ((uri->stype == LTTNG_STREAM_CONTROL &&
382 consumer->dst.net.control_isset) ||
383 (uri->stype == LTTNG_STREAM_DATA &&
384 consumer->dst.net.data_isset)) {
385 ret = LTTNG_ERR_URL_EXIST;
386 goto error;
387 }
388
389 /* Set URI into consumer output object */
390 ret = consumer_set_network_uri(consumer, uri);
391 if (ret < 0) {
392 ret = LTTNG_ERR_FATAL;
393 goto error;
394 } else if (ret == 1) {
395 /*
396 * URI was the same in the consumer so we do not append the subdir
397 * again so to not duplicate output dir.
398 */
399 goto error;
400 }
401
402 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
403 ret = consumer_set_subdir(consumer, session_name);
404 if (ret < 0) {
405 ret = LTTNG_ERR_FATAL;
406 goto error;
407 }
408 }
409
410 if (uri->stype == LTTNG_STREAM_CONTROL) {
411 /* On a new subdir, reappend the default trace dir. */
412 strncat(consumer->subdir, default_trace_dir,
413 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
414 DBG3("Append domain trace name to subdir %s", consumer->subdir);
415 }
416
417 break;
418 case LTTNG_DST_PATH:
419 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
420 memset(consumer->dst.trace_path, 0,
421 sizeof(consumer->dst.trace_path));
422 strncpy(consumer->dst.trace_path, uri->dst.path,
423 sizeof(consumer->dst.trace_path));
424 /* Append default trace dir */
425 strncat(consumer->dst.trace_path, default_trace_dir,
426 sizeof(consumer->dst.trace_path) -
427 strlen(consumer->dst.trace_path) - 1);
428 /* Flag consumer as local. */
429 consumer->type = CONSUMER_DST_LOCAL;
430 break;
431 }
432
433 error:
434 return ret;
435 }
436
437 /*
438 * Init tracing by creating trace directory and sending fds kernel consumer.
439 */
440 static int init_kernel_tracing(struct ltt_kernel_session *session)
441 {
442 int ret = 0;
443 struct lttng_ht_iter iter;
444 struct consumer_socket *socket;
445
446 assert(session);
447
448 rcu_read_lock();
449
450 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
451 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
452 socket, node.node) {
453 /* Code flow error */
454 assert(socket->fd >= 0);
455
456 pthread_mutex_lock(socket->lock);
457 ret = kernel_consumer_send_session(socket, session);
458 pthread_mutex_unlock(socket->lock);
459 if (ret < 0) {
460 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
461 goto error;
462 }
463 }
464 }
465
466 error:
467 rcu_read_unlock();
468 return ret;
469 }
470
471 /*
472 * Create a socket to the relayd using the URI.
473 *
474 * On success, the relayd_sock pointer is set to the created socket.
475 * Else, it's stays untouched and a lttcomm error code is returned.
476 */
477 static int create_connect_relayd(struct consumer_output *output,
478 const char *session_name, struct lttng_uri *uri,
479 struct lttcomm_sock **relayd_sock)
480 {
481 int ret;
482 struct lttcomm_sock *sock;
483
484 /* Create socket object from URI */
485 sock = lttcomm_alloc_sock_from_uri(uri);
486 if (sock == NULL) {
487 ret = LTTNG_ERR_FATAL;
488 goto error;
489 }
490
491 ret = lttcomm_create_sock(sock);
492 if (ret < 0) {
493 ret = LTTNG_ERR_FATAL;
494 goto error;
495 }
496
497 /*
498 * Connect to relayd so we can proceed with a session creation. This call
499 * can possibly block for an arbitrary amount of time to set the health
500 * state to be in poll execution.
501 */
502 health_poll_entry();
503 ret = relayd_connect(sock);
504 health_poll_exit();
505 if (ret < 0) {
506 ERR("Unable to reach lttng-relayd");
507 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
508 goto free_sock;
509 }
510
511 /* Create socket for control stream. */
512 if (uri->stype == LTTNG_STREAM_CONTROL) {
513 DBG3("Creating relayd stream socket from URI");
514
515 /* Check relayd version */
516 ret = relayd_version_check(sock, RELAYD_VERSION_COMM_MAJOR,
517 RELAYD_VERSION_COMM_MINOR);
518 if (ret < 0) {
519 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
520 goto close_sock;
521 }
522 } else if (uri->stype == LTTNG_STREAM_DATA) {
523 DBG3("Creating relayd data socket from URI");
524 } else {
525 /* Command is not valid */
526 ERR("Relayd invalid stream type: %d", uri->stype);
527 ret = LTTNG_ERR_INVALID;
528 goto close_sock;
529 }
530
531 *relayd_sock = sock;
532
533 return LTTNG_OK;
534
535 close_sock:
536 if (sock) {
537 (void) relayd_close(sock);
538 }
539 free_sock:
540 if (sock) {
541 lttcomm_destroy_sock(sock);
542 }
543 error:
544 return ret;
545 }
546
547 /*
548 * Connect to the relayd using URI and send the socket to the right consumer.
549 */
550 static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
551 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
552 struct consumer_socket *consumer_sock)
553 {
554 int ret;
555 struct lttcomm_sock *sock = NULL;
556
557 /* Connect to relayd and make version check if uri is the control. */
558 ret = create_connect_relayd(consumer, session->name, relayd_uri, &sock);
559 if (ret != LTTNG_OK) {
560 goto close_sock;
561 }
562
563 /* If the control socket is connected, network session is ready */
564 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
565 session->net_handle = 1;
566 }
567
568 /* Set the network sequence index if not set. */
569 if (consumer->net_seq_index == -1) {
570 /*
571 * Increment net_seq_idx because we are about to transfer the
572 * new relayd socket to the consumer.
573 */
574 uatomic_inc(&relayd_net_seq_idx);
575 /* Assign unique key so the consumer can match streams */
576 uatomic_set(&consumer->net_seq_index,
577 uatomic_read(&relayd_net_seq_idx));
578 }
579
580 /* Send relayd socket to consumer. */
581 ret = consumer_send_relayd_socket(consumer_sock, sock,
582 consumer, relayd_uri->stype, session->id);
583 if (ret < 0) {
584 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
585 goto close_sock;
586 }
587
588 /* Flag that the corresponding socket was sent. */
589 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
590 consumer_sock->control_sock_sent = 1;
591 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
592 consumer_sock->data_sock_sent = 1;
593 }
594
595 ret = LTTNG_OK;
596
597 /*
598 * Close socket which was dup on the consumer side. The session daemon does
599 * NOT keep track of the relayd socket(s) once transfer to the consumer.
600 */
601
602 close_sock:
603 if (sock) {
604 (void) relayd_close(sock);
605 lttcomm_destroy_sock(sock);
606 }
607
608 if (ret != LTTNG_OK) {
609 /*
610 * On error, nullify the consumer sequence index so streams are not
611 * associated with it once sent to the consumer.
612 */
613 uatomic_set(&consumer->net_seq_index, -1);
614 }
615
616 return ret;
617 }
618
619 /*
620 * Send both relayd sockets to a specific consumer and domain. This is a
621 * helper function to facilitate sending the information to the consumer for a
622 * session.
623 */
624 static int send_consumer_relayd_sockets(int domain,
625 struct ltt_session *session, struct consumer_output *consumer,
626 struct consumer_socket *sock)
627 {
628 int ret = LTTNG_OK;
629
630 assert(session);
631 assert(consumer);
632
633 /* Sending control relayd socket. */
634 if (!sock->control_sock_sent) {
635 ret = send_consumer_relayd_socket(domain, session,
636 &consumer->dst.net.control, consumer, sock);
637 if (ret != LTTNG_OK) {
638 goto error;
639 }
640 }
641
642 /* Sending data relayd socket. */
643 if (!sock->data_sock_sent) {
644 ret = send_consumer_relayd_socket(domain, session,
645 &consumer->dst.net.data, consumer, sock);
646 if (ret != LTTNG_OK) {
647 goto error;
648 }
649 }
650
651 error:
652 return ret;
653 }
654
655 /*
656 * Setup relayd connections for a tracing session. First creates the socket to
657 * the relayd and send them to the right domain consumer. Consumer type MUST be
658 * network.
659 */
660 int cmd_setup_relayd(struct ltt_session *session)
661 {
662 int ret = LTTNG_OK;
663 struct ltt_ust_session *usess;
664 struct ltt_kernel_session *ksess;
665 struct consumer_socket *socket;
666 struct lttng_ht_iter iter;
667
668 assert(session);
669
670 usess = session->ust_session;
671 ksess = session->kernel_session;
672
673 DBG("Setting relayd for session %s", session->name);
674
675 rcu_read_lock();
676
677 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
678 && usess->consumer->enabled) {
679 /* For each consumer socket, send relayd sockets */
680 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
681 socket, node.node) {
682 /* Code flow error */
683 assert(socket->fd >= 0);
684
685 pthread_mutex_lock(socket->lock);
686 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
687 usess->consumer, socket);
688 pthread_mutex_unlock(socket->lock);
689 if (ret != LTTNG_OK) {
690 goto error;
691 }
692 }
693 }
694
695 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
696 && ksess->consumer->enabled) {
697 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
698 socket, node.node) {
699 /* Code flow error */
700 assert(socket->fd >= 0);
701
702 pthread_mutex_lock(socket->lock);
703 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
704 ksess->consumer, socket);
705 pthread_mutex_unlock(socket->lock);
706 if (ret != LTTNG_OK) {
707 goto error;
708 }
709 }
710 }
711
712 error:
713 rcu_read_unlock();
714 return ret;
715 }
716
717 /*
718 * Start a kernel session by opening all necessary streams.
719 */
720 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
721 {
722 int ret;
723 struct ltt_kernel_channel *kchan;
724
725 /* Open kernel metadata */
726 if (ksess->metadata == NULL) {
727 ret = kernel_open_metadata(ksess);
728 if (ret < 0) {
729 ret = LTTNG_ERR_KERN_META_FAIL;
730 goto error;
731 }
732 }
733
734 /* Open kernel metadata stream */
735 if (ksess->metadata_stream_fd < 0) {
736 ret = kernel_open_metadata_stream(ksess);
737 if (ret < 0) {
738 ERR("Kernel create metadata stream failed");
739 ret = LTTNG_ERR_KERN_STREAM_FAIL;
740 goto error;
741 }
742 }
743
744 /* For each channel */
745 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
746 if (kchan->stream_count == 0) {
747 ret = kernel_open_channel_stream(kchan);
748 if (ret < 0) {
749 ret = LTTNG_ERR_KERN_STREAM_FAIL;
750 goto error;
751 }
752 /* Update the stream global counter */
753 ksess->stream_count_global += ret;
754 }
755 }
756
757 /* Setup kernel consumer socket and send fds to it */
758 ret = init_kernel_tracing(ksess);
759 if (ret < 0) {
760 ret = LTTNG_ERR_KERN_START_FAIL;
761 goto error;
762 }
763
764 /* This start the kernel tracing */
765 ret = kernel_start_session(ksess);
766 if (ret < 0) {
767 ret = LTTNG_ERR_KERN_START_FAIL;
768 goto error;
769 }
770
771 /* Quiescent wait after starting trace */
772 kernel_wait_quiescent(kernel_tracer_fd);
773
774 ksess->started = 1;
775
776 ret = LTTNG_OK;
777
778 error:
779 return ret;
780 }
781
782 /*
783 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
784 */
785 int cmd_disable_channel(struct ltt_session *session, int domain,
786 char *channel_name)
787 {
788 int ret;
789 struct ltt_ust_session *usess;
790
791 usess = session->ust_session;
792
793 rcu_read_lock();
794
795 switch (domain) {
796 case LTTNG_DOMAIN_KERNEL:
797 {
798 ret = channel_kernel_disable(session->kernel_session,
799 channel_name);
800 if (ret != LTTNG_OK) {
801 goto error;
802 }
803
804 kernel_wait_quiescent(kernel_tracer_fd);
805 break;
806 }
807 case LTTNG_DOMAIN_UST:
808 {
809 struct ltt_ust_channel *uchan;
810 struct lttng_ht *chan_ht;
811
812 chan_ht = usess->domain_global.channels;
813
814 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
815 if (uchan == NULL) {
816 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
817 goto error;
818 }
819
820 ret = channel_ust_disable(usess, domain, uchan);
821 if (ret != LTTNG_OK) {
822 goto error;
823 }
824 break;
825 }
826 #if 0
827 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
828 case LTTNG_DOMAIN_UST_EXEC_NAME:
829 case LTTNG_DOMAIN_UST_PID:
830 #endif
831 default:
832 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
833 goto error;
834 }
835
836 ret = LTTNG_OK;
837
838 error:
839 rcu_read_unlock();
840 return ret;
841 }
842
843 /*
844 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
845 *
846 * The wpipe arguments is used as a notifier for the kernel thread.
847 */
848 int cmd_enable_channel(struct ltt_session *session,
849 int domain, struct lttng_channel *attr, int wpipe)
850 {
851 int ret;
852 struct ltt_ust_session *usess = session->ust_session;
853 struct lttng_ht *chan_ht;
854
855 assert(session);
856 assert(attr);
857
858 DBG("Enabling channel %s for session %s", attr->name, session->name);
859
860 rcu_read_lock();
861
862 switch (domain) {
863 case LTTNG_DOMAIN_KERNEL:
864 {
865 struct ltt_kernel_channel *kchan;
866
867 kchan = trace_kernel_get_channel_by_name(attr->name,
868 session->kernel_session);
869 if (kchan == NULL) {
870 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
871 } else {
872 ret = channel_kernel_enable(session->kernel_session, kchan);
873 }
874
875 if (ret != LTTNG_OK) {
876 goto error;
877 }
878
879 kernel_wait_quiescent(kernel_tracer_fd);
880
881 /*
882 * If the session was previously started, start as well this newly
883 * created kernel session so the events/channels enabled *after* the
884 * start actually work.
885 */
886 if (session->started && !session->kernel_session->started) {
887 ret = start_kernel_session(session->kernel_session, wpipe);
888 if (ret != LTTNG_OK) {
889 goto error;
890 }
891 }
892 break;
893 }
894 case LTTNG_DOMAIN_UST:
895 {
896 struct ltt_ust_channel *uchan;
897
898 chan_ht = usess->domain_global.channels;
899
900 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
901 if (uchan == NULL) {
902 ret = channel_ust_create(usess, domain, attr);
903 } else {
904 ret = channel_ust_enable(usess, domain, uchan);
905 }
906
907 /* Start the UST session if the session was already started. */
908 if (session->started && !usess->start_trace) {
909 ret = ust_app_start_trace_all(usess);
910 if (ret < 0) {
911 ret = LTTNG_ERR_UST_START_FAIL;
912 goto error;
913 }
914 ret = LTTNG_OK;
915 usess->start_trace = 1;
916 }
917 break;
918 }
919 #if 0
920 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
921 case LTTNG_DOMAIN_UST_EXEC_NAME:
922 case LTTNG_DOMAIN_UST_PID:
923 #endif
924 default:
925 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
926 goto error;
927 }
928
929 error:
930 rcu_read_unlock();
931 return ret;
932 }
933
934
935 /*
936 * Command LTTNG_DISABLE_EVENT processed by the client thread.
937 */
938 int cmd_disable_event(struct ltt_session *session, int domain,
939 char *channel_name, char *event_name)
940 {
941 int ret;
942
943 rcu_read_lock();
944
945 switch (domain) {
946 case LTTNG_DOMAIN_KERNEL:
947 {
948 struct ltt_kernel_channel *kchan;
949 struct ltt_kernel_session *ksess;
950
951 ksess = session->kernel_session;
952
953 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
954 if (kchan == NULL) {
955 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
956 goto error;
957 }
958
959 ret = event_kernel_disable_tracepoint(kchan, event_name);
960 if (ret != LTTNG_OK) {
961 goto error;
962 }
963
964 kernel_wait_quiescent(kernel_tracer_fd);
965 break;
966 }
967 case LTTNG_DOMAIN_UST:
968 {
969 struct ltt_ust_channel *uchan;
970 struct ltt_ust_session *usess;
971
972 usess = session->ust_session;
973
974 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
975 channel_name);
976 if (uchan == NULL) {
977 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
978 goto error;
979 }
980
981 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
982 if (ret != LTTNG_OK) {
983 goto error;
984 }
985
986 DBG3("Disable UST event %s in channel %s completed", event_name,
987 channel_name);
988 break;
989 }
990 #if 0
991 case LTTNG_DOMAIN_UST_EXEC_NAME:
992 case LTTNG_DOMAIN_UST_PID:
993 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
994 #endif
995 default:
996 ret = LTTNG_ERR_UND;
997 goto error;
998 }
999
1000 ret = LTTNG_OK;
1001
1002 error:
1003 rcu_read_unlock();
1004 return ret;
1005 }
1006
1007 /*
1008 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1009 */
1010 int cmd_disable_event_all(struct ltt_session *session, int domain,
1011 char *channel_name)
1012 {
1013 int ret;
1014
1015 rcu_read_lock();
1016
1017 switch (domain) {
1018 case LTTNG_DOMAIN_KERNEL:
1019 {
1020 struct ltt_kernel_session *ksess;
1021 struct ltt_kernel_channel *kchan;
1022
1023 ksess = session->kernel_session;
1024
1025 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1026 if (kchan == NULL) {
1027 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1028 goto error;
1029 }
1030
1031 ret = event_kernel_disable_all(kchan);
1032 if (ret != LTTNG_OK) {
1033 goto error;
1034 }
1035
1036 kernel_wait_quiescent(kernel_tracer_fd);
1037 break;
1038 }
1039 case LTTNG_DOMAIN_UST:
1040 {
1041 struct ltt_ust_session *usess;
1042 struct ltt_ust_channel *uchan;
1043
1044 usess = session->ust_session;
1045
1046 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1047 channel_name);
1048 if (uchan == NULL) {
1049 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1050 goto error;
1051 }
1052
1053 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
1054 if (ret != 0) {
1055 goto error;
1056 }
1057
1058 DBG3("Disable all UST events in channel %s completed", channel_name);
1059
1060 break;
1061 }
1062 #if 0
1063 case LTTNG_DOMAIN_UST_EXEC_NAME:
1064 case LTTNG_DOMAIN_UST_PID:
1065 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1066 #endif
1067 default:
1068 ret = LTTNG_ERR_UND;
1069 goto error;
1070 }
1071
1072 ret = LTTNG_OK;
1073
1074 error:
1075 rcu_read_unlock();
1076 return ret;
1077 }
1078
1079 /*
1080 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1081 */
1082 int cmd_add_context(struct ltt_session *session, int domain,
1083 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1084 {
1085 int ret;
1086
1087 switch (domain) {
1088 case LTTNG_DOMAIN_KERNEL:
1089 assert(session->kernel_session);
1090
1091 if (session->kernel_session->channel_count == 0) {
1092 /* Create default channel */
1093 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1094 if (ret != LTTNG_OK) {
1095 goto error;
1096 }
1097 }
1098
1099 /* Add kernel context to kernel tracer */
1100 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1101 if (ret != LTTNG_OK) {
1102 goto error;
1103 }
1104 break;
1105 case LTTNG_DOMAIN_UST:
1106 {
1107 struct ltt_ust_session *usess = session->ust_session;
1108 assert(usess);
1109
1110 unsigned int chan_count =
1111 lttng_ht_get_count(usess->domain_global.channels);
1112 if (chan_count == 0) {
1113 struct lttng_channel *attr;
1114 /* Create default channel */
1115 attr = channel_new_default_attr(domain);
1116 if (attr == NULL) {
1117 ret = LTTNG_ERR_FATAL;
1118 goto error;
1119 }
1120
1121 ret = channel_ust_create(usess, domain, attr);
1122 if (ret != LTTNG_OK) {
1123 free(attr);
1124 goto error;
1125 }
1126 free(attr);
1127 }
1128
1129 ret = context_ust_add(usess, domain, ctx, channel_name);
1130 if (ret != LTTNG_OK) {
1131 goto error;
1132 }
1133 break;
1134 }
1135 #if 0
1136 case LTTNG_DOMAIN_UST_EXEC_NAME:
1137 case LTTNG_DOMAIN_UST_PID:
1138 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1139 #endif
1140 default:
1141 ret = LTTNG_ERR_UND;
1142 goto error;
1143 }
1144
1145 ret = LTTNG_OK;
1146
1147 error:
1148 return ret;
1149 }
1150
1151 /*
1152 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1153 */
1154 int cmd_enable_event(struct ltt_session *session, int domain,
1155 char *channel_name, struct lttng_event *event,
1156 struct lttng_filter_bytecode *filter, int wpipe)
1157 {
1158 int ret, channel_created = 0;
1159 struct lttng_channel *attr;
1160
1161 assert(session);
1162 assert(event);
1163 assert(channel_name);
1164
1165 rcu_read_lock();
1166
1167 switch (domain) {
1168 case LTTNG_DOMAIN_KERNEL:
1169 {
1170 struct ltt_kernel_channel *kchan;
1171
1172 kchan = trace_kernel_get_channel_by_name(channel_name,
1173 session->kernel_session);
1174 if (kchan == NULL) {
1175 attr = channel_new_default_attr(domain);
1176 if (attr == NULL) {
1177 ret = LTTNG_ERR_FATAL;
1178 goto error;
1179 }
1180 strncpy(attr->name, channel_name, sizeof(attr->name));
1181
1182 ret = cmd_enable_channel(session, domain, attr, wpipe);
1183 if (ret != LTTNG_OK) {
1184 free(attr);
1185 goto error;
1186 }
1187 free(attr);
1188
1189 channel_created = 1;
1190 }
1191
1192 /* Get the newly created kernel channel pointer */
1193 kchan = trace_kernel_get_channel_by_name(channel_name,
1194 session->kernel_session);
1195 if (kchan == NULL) {
1196 /* This sould not happen... */
1197 ret = LTTNG_ERR_FATAL;
1198 goto error;
1199 }
1200
1201 ret = event_kernel_enable_tracepoint(kchan, event);
1202 if (ret != LTTNG_OK) {
1203 if (channel_created) {
1204 /* Let's not leak a useless channel. */
1205 kernel_destroy_channel(kchan);
1206 }
1207 goto error;
1208 }
1209
1210 kernel_wait_quiescent(kernel_tracer_fd);
1211 break;
1212 }
1213 case LTTNG_DOMAIN_UST:
1214 {
1215 struct ltt_ust_channel *uchan;
1216 struct ltt_ust_session *usess = session->ust_session;
1217
1218 assert(usess);
1219
1220 /* Get channel from global UST domain */
1221 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1222 channel_name);
1223 if (uchan == NULL) {
1224 /* Create default channel */
1225 attr = channel_new_default_attr(domain);
1226 if (attr == NULL) {
1227 ret = LTTNG_ERR_FATAL;
1228 goto error;
1229 }
1230 strncpy(attr->name, channel_name, sizeof(attr->name));
1231
1232 ret = cmd_enable_channel(session, domain, attr, wpipe);
1233 if (ret != LTTNG_OK) {
1234 free(attr);
1235 goto error;
1236 }
1237 free(attr);
1238
1239 /* Get the newly created channel reference back */
1240 uchan = trace_ust_find_channel_by_name(
1241 usess->domain_global.channels, channel_name);
1242 assert(uchan);
1243 }
1244
1245 /* At this point, the session and channel exist on the tracer */
1246 ret = event_ust_enable_tracepoint(usess, domain, uchan, event, filter);
1247 if (ret != LTTNG_OK) {
1248 goto error;
1249 }
1250 break;
1251 }
1252 #if 0
1253 case LTTNG_DOMAIN_UST_EXEC_NAME:
1254 case LTTNG_DOMAIN_UST_PID:
1255 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1256 #endif
1257 default:
1258 ret = LTTNG_ERR_UND;
1259 goto error;
1260 }
1261
1262 ret = LTTNG_OK;
1263
1264 error:
1265 rcu_read_unlock();
1266 return ret;
1267 }
1268
1269 /*
1270 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1271 */
1272 int cmd_enable_event_all(struct ltt_session *session, int domain,
1273 char *channel_name, int event_type,
1274 struct lttng_filter_bytecode *filter, int wpipe)
1275 {
1276 int ret;
1277 struct lttng_channel *attr;
1278
1279 assert(session);
1280 assert(channel_name);
1281
1282 rcu_read_lock();
1283
1284 switch (domain) {
1285 case LTTNG_DOMAIN_KERNEL:
1286 {
1287 struct ltt_kernel_channel *kchan;
1288
1289 assert(session->kernel_session);
1290
1291 kchan = trace_kernel_get_channel_by_name(channel_name,
1292 session->kernel_session);
1293 if (kchan == NULL) {
1294 /* Create default channel */
1295 attr = channel_new_default_attr(domain);
1296 if (attr == NULL) {
1297 ret = LTTNG_ERR_FATAL;
1298 goto error;
1299 }
1300 strncpy(attr->name, channel_name, sizeof(attr->name));
1301
1302 ret = cmd_enable_channel(session, domain, attr, wpipe);
1303 if (ret != LTTNG_OK) {
1304 free(attr);
1305 goto error;
1306 }
1307 free(attr);
1308
1309 /* Get the newly created kernel channel pointer */
1310 kchan = trace_kernel_get_channel_by_name(channel_name,
1311 session->kernel_session);
1312 assert(kchan);
1313 }
1314
1315 switch (event_type) {
1316 case LTTNG_EVENT_SYSCALL:
1317 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1318 break;
1319 case LTTNG_EVENT_TRACEPOINT:
1320 /*
1321 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1322 * events already registered to the channel.
1323 */
1324 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1325 break;
1326 case LTTNG_EVENT_ALL:
1327 /* Enable syscalls and tracepoints */
1328 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1329 break;
1330 default:
1331 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1332 goto error;
1333 }
1334
1335 /* Manage return value */
1336 if (ret != LTTNG_OK) {
1337 /*
1338 * On error, cmd_enable_channel call will take care of destroying
1339 * the created channel if it was needed.
1340 */
1341 goto error;
1342 }
1343
1344 kernel_wait_quiescent(kernel_tracer_fd);
1345 break;
1346 }
1347 case LTTNG_DOMAIN_UST:
1348 {
1349 struct ltt_ust_channel *uchan;
1350 struct ltt_ust_session *usess = session->ust_session;
1351
1352 assert(usess);
1353
1354 /* Get channel from global UST domain */
1355 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1356 channel_name);
1357 if (uchan == NULL) {
1358 /* Create default channel */
1359 attr = channel_new_default_attr(domain);
1360 if (attr == NULL) {
1361 ret = LTTNG_ERR_FATAL;
1362 goto error;
1363 }
1364 strncpy(attr->name, channel_name, sizeof(attr->name));
1365
1366 ret = cmd_enable_channel(session, domain, attr, wpipe);
1367 if (ret != LTTNG_OK) {
1368 free(attr);
1369 goto error;
1370 }
1371 free(attr);
1372
1373 /* Get the newly created channel reference back */
1374 uchan = trace_ust_find_channel_by_name(
1375 usess->domain_global.channels, channel_name);
1376 assert(uchan);
1377 }
1378
1379 /* At this point, the session and channel exist on the tracer */
1380
1381 switch (event_type) {
1382 case LTTNG_EVENT_ALL:
1383 case LTTNG_EVENT_TRACEPOINT:
1384 ret = event_ust_enable_all_tracepoints(usess, domain, uchan,
1385 filter);
1386 if (ret != LTTNG_OK) {
1387 goto error;
1388 }
1389 break;
1390 default:
1391 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1392 goto error;
1393 }
1394
1395 /* Manage return value */
1396 if (ret != LTTNG_OK) {
1397 goto error;
1398 }
1399
1400 break;
1401 }
1402 #if 0
1403 case LTTNG_DOMAIN_UST_EXEC_NAME:
1404 case LTTNG_DOMAIN_UST_PID:
1405 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1406 #endif
1407 default:
1408 ret = LTTNG_ERR_UND;
1409 goto error;
1410 }
1411
1412 ret = LTTNG_OK;
1413
1414 error:
1415 rcu_read_unlock();
1416 return ret;
1417 }
1418
1419
1420 /*
1421 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1422 */
1423 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1424 {
1425 int ret;
1426 ssize_t nb_events = 0;
1427
1428 switch (domain) {
1429 case LTTNG_DOMAIN_KERNEL:
1430 nb_events = kernel_list_events(kernel_tracer_fd, events);
1431 if (nb_events < 0) {
1432 ret = LTTNG_ERR_KERN_LIST_FAIL;
1433 goto error;
1434 }
1435 break;
1436 case LTTNG_DOMAIN_UST:
1437 nb_events = ust_app_list_events(events);
1438 if (nb_events < 0) {
1439 ret = LTTNG_ERR_UST_LIST_FAIL;
1440 goto error;
1441 }
1442 break;
1443 default:
1444 ret = LTTNG_ERR_UND;
1445 goto error;
1446 }
1447
1448 return nb_events;
1449
1450 error:
1451 /* Return negative value to differentiate return code */
1452 return -ret;
1453 }
1454
1455 /*
1456 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1457 */
1458 ssize_t cmd_list_tracepoint_fields(int domain,
1459 struct lttng_event_field **fields)
1460 {
1461 int ret;
1462 ssize_t nb_fields = 0;
1463
1464 switch (domain) {
1465 case LTTNG_DOMAIN_UST:
1466 nb_fields = ust_app_list_event_fields(fields);
1467 if (nb_fields < 0) {
1468 ret = LTTNG_ERR_UST_LIST_FAIL;
1469 goto error;
1470 }
1471 break;
1472 case LTTNG_DOMAIN_KERNEL:
1473 default: /* fall-through */
1474 ret = LTTNG_ERR_UND;
1475 goto error;
1476 }
1477
1478 return nb_fields;
1479
1480 error:
1481 /* Return negative value to differentiate return code */
1482 return -ret;
1483 }
1484
1485 /*
1486 * Command LTTNG_START_TRACE processed by the client thread.
1487 */
1488 int cmd_start_trace(struct ltt_session *session)
1489 {
1490 int ret;
1491 struct ltt_kernel_session *ksession;
1492 struct ltt_ust_session *usess;
1493
1494 assert(session);
1495
1496 /* Ease our life a bit ;) */
1497 ksession = session->kernel_session;
1498 usess = session->ust_session;
1499
1500 if (session->enabled) {
1501 /* Already started. */
1502 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1503 goto error;
1504 }
1505
1506 session->enabled = 1;
1507
1508 /* Kernel tracing */
1509 if (ksession != NULL) {
1510 ret = start_kernel_session(ksession, kernel_tracer_fd);
1511 if (ret != LTTNG_OK) {
1512 goto error;
1513 }
1514 }
1515
1516 /* Flag session that trace should start automatically */
1517 if (usess) {
1518 usess->start_trace = 1;
1519
1520 ret = ust_app_start_trace_all(usess);
1521 if (ret < 0) {
1522 ret = LTTNG_ERR_UST_START_FAIL;
1523 goto error;
1524 }
1525 }
1526
1527 session->started = 1;
1528
1529 ret = LTTNG_OK;
1530
1531 error:
1532 return ret;
1533 }
1534
1535 /*
1536 * Command LTTNG_STOP_TRACE processed by the client thread.
1537 */
1538 int cmd_stop_trace(struct ltt_session *session)
1539 {
1540 int ret;
1541 struct ltt_kernel_channel *kchan;
1542 struct ltt_kernel_session *ksession;
1543 struct ltt_ust_session *usess;
1544
1545 assert(session);
1546
1547 /* Short cut */
1548 ksession = session->kernel_session;
1549 usess = session->ust_session;
1550
1551 if (!session->enabled) {
1552 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1553 goto error;
1554 }
1555
1556 session->enabled = 0;
1557
1558 /* Kernel tracer */
1559 if (ksession) {
1560 DBG("Stop kernel tracing");
1561
1562 /* Flush metadata if exist */
1563 if (ksession->metadata_stream_fd >= 0) {
1564 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1565 if (ret < 0) {
1566 ERR("Kernel metadata flush failed");
1567 }
1568 }
1569
1570 /* Flush all buffers before stopping */
1571 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1572 ret = kernel_flush_buffer(kchan);
1573 if (ret < 0) {
1574 ERR("Kernel flush buffer error");
1575 }
1576 }
1577
1578 ret = kernel_stop_session(ksession);
1579 if (ret < 0) {
1580 ret = LTTNG_ERR_KERN_STOP_FAIL;
1581 goto error;
1582 }
1583
1584 kernel_wait_quiescent(kernel_tracer_fd);
1585
1586 ksession->started = 0;
1587 }
1588
1589 if (usess) {
1590 usess->start_trace = 0;
1591
1592 ret = ust_app_stop_trace_all(usess);
1593 if (ret < 0) {
1594 ret = LTTNG_ERR_UST_STOP_FAIL;
1595 goto error;
1596 }
1597 }
1598
1599 session->started = 0;
1600
1601 ret = LTTNG_OK;
1602
1603 error:
1604 return ret;
1605 }
1606
1607 /*
1608 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1609 */
1610 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1611 size_t nb_uri, struct lttng_uri *uris)
1612 {
1613 int ret, i;
1614 struct ltt_kernel_session *ksess = session->kernel_session;
1615 struct ltt_ust_session *usess = session->ust_session;
1616 struct consumer_output *consumer = NULL;
1617
1618 assert(session);
1619 assert(uris);
1620 assert(nb_uri > 0);
1621
1622 /* Can't enable consumer after session started. */
1623 if (session->enabled) {
1624 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1625 goto error;
1626 }
1627
1628 /*
1629 * This case switch makes sure the domain session has a temporary consumer
1630 * so the URL can be set.
1631 */
1632 switch (domain) {
1633 case 0:
1634 /* Code flow error. A session MUST always have a consumer object */
1635 assert(session->consumer);
1636 /*
1637 * The URL will be added to the tracing session consumer instead of a
1638 * specific domain consumer.
1639 */
1640 consumer = session->consumer;
1641 break;
1642 case LTTNG_DOMAIN_KERNEL:
1643 /* Code flow error if we don't have a kernel session here. */
1644 assert(ksess);
1645 assert(ksess->consumer);
1646 consumer = ksess->consumer;
1647 break;
1648 case LTTNG_DOMAIN_UST:
1649 /* Code flow error if we don't have a kernel session here. */
1650 assert(usess);
1651 assert(usess->consumer);
1652 consumer = usess->consumer;
1653 break;
1654 }
1655
1656 for (i = 0; i < nb_uri; i++) {
1657 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1658 if (ret < 0) {
1659 goto error;
1660 }
1661 }
1662
1663 /* All good! */
1664 ret = LTTNG_OK;
1665
1666 error:
1667 return ret;
1668 }
1669
1670 /*
1671 * Command LTTNG_CREATE_SESSION processed by the client thread.
1672 */
1673 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1674 size_t nb_uri, lttng_sock_cred *creds)
1675 {
1676 int ret;
1677 char *path = NULL;
1678 struct ltt_session *session;
1679
1680 assert(name);
1681
1682 /* No URIs is not possible. */
1683 if (uris == NULL) {
1684 ret = LTTNG_ERR_SESSION_FAIL;
1685 goto session_error;
1686 }
1687
1688 /*
1689 * Verify if the session already exist
1690 *
1691 * XXX: There is no need for the session lock list here since the caller
1692 * (process_client_msg) is holding it. We might want to change that so a
1693 * single command does not lock the entire session list.
1694 */
1695 session = session_find_by_name(name);
1696 if (session != NULL) {
1697 ret = LTTNG_ERR_EXIST_SESS;
1698 goto find_error;
1699 }
1700
1701 /* Create tracing session in the registry */
1702 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
1703 LTTNG_SOCK_GET_GID_CRED(creds));
1704 if (ret != LTTNG_OK) {
1705 goto session_error;
1706 }
1707
1708 /*
1709 * Get the newly created session pointer back
1710 *
1711 * XXX: There is no need for the session lock list here since the caller
1712 * (process_client_msg) is holding it. We might want to change that so a
1713 * single command does not lock the entire session list.
1714 */
1715 session = session_find_by_name(name);
1716 assert(session);
1717
1718 /* Create default consumer output for the session not yet created. */
1719 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1720 if (session->consumer == NULL) {
1721 ret = LTTNG_ERR_FATAL;
1722 goto consumer_error;
1723 }
1724
1725 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1726 if (ret != LTTNG_OK) {
1727 goto consumer_error;
1728 }
1729
1730 session->consumer->enabled = 1;
1731
1732 return LTTNG_OK;
1733
1734 consumer_error:
1735 session_destroy(session);
1736 session_error:
1737 find_error:
1738 return ret;
1739 }
1740
1741 /*
1742 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1743 */
1744 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1745 {
1746 int ret;
1747 struct ltt_ust_session *usess;
1748 struct ltt_kernel_session *ksess;
1749
1750 /* Safety net */
1751 assert(session);
1752
1753 usess = session->ust_session;
1754 ksess = session->kernel_session;
1755
1756 /* Clean kernel session teardown */
1757 kernel_destroy_session(ksess);
1758
1759 /* UST session teardown */
1760 if (usess) {
1761 /* Close any relayd session */
1762 consumer_output_send_destroy_relayd(usess->consumer);
1763
1764 /* Destroy every UST application related to this session. */
1765 ret = ust_app_destroy_trace_all(usess);
1766 if (ret) {
1767 ERR("Error in ust_app_destroy_trace_all");
1768 }
1769
1770 /* Clean up the rest. */
1771 trace_ust_destroy_session(usess);
1772 }
1773
1774 /*
1775 * Must notify the kernel thread here to update it's poll set in order to
1776 * remove the channel(s)' fd just destroyed.
1777 */
1778 ret = notify_thread_pipe(wpipe);
1779 if (ret < 0) {
1780 PERROR("write kernel poll pipe");
1781 }
1782
1783 ret = session_destroy(session);
1784
1785 return ret;
1786 }
1787
1788 /*
1789 * Command LTTNG_CALIBRATE processed by the client thread.
1790 */
1791 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1792 {
1793 int ret;
1794
1795 switch (domain) {
1796 case LTTNG_DOMAIN_KERNEL:
1797 {
1798 struct lttng_kernel_calibrate kcalibrate;
1799
1800 kcalibrate.type = calibrate->type;
1801 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1802 if (ret < 0) {
1803 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1804 goto error;
1805 }
1806 break;
1807 }
1808 case LTTNG_DOMAIN_UST:
1809 {
1810 struct lttng_ust_calibrate ucalibrate;
1811
1812 ucalibrate.type = calibrate->type;
1813 ret = ust_app_calibrate_glb(&ucalibrate);
1814 if (ret < 0) {
1815 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1816 goto error;
1817 }
1818 break;
1819 }
1820 default:
1821 ret = LTTNG_ERR_UND;
1822 goto error;
1823 }
1824
1825 ret = LTTNG_OK;
1826
1827 error:
1828 return ret;
1829 }
1830
1831 /*
1832 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1833 */
1834 int cmd_register_consumer(struct ltt_session *session, int domain,
1835 const char *sock_path, struct consumer_data *cdata)
1836 {
1837 int ret, sock;
1838 struct consumer_socket *socket;
1839
1840 assert(session);
1841 assert(cdata);
1842 assert(sock_path);
1843
1844 switch (domain) {
1845 case LTTNG_DOMAIN_KERNEL:
1846 {
1847 struct ltt_kernel_session *ksess = session->kernel_session;
1848
1849 assert(ksess);
1850
1851 /* Can't register a consumer if there is already one */
1852 if (ksess->consumer_fds_sent != 0) {
1853 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1854 goto error;
1855 }
1856
1857 sock = lttcomm_connect_unix_sock(sock_path);
1858 if (sock < 0) {
1859 ret = LTTNG_ERR_CONNECT_FAIL;
1860 goto error;
1861 }
1862
1863 socket = consumer_allocate_socket(sock);
1864 if (socket == NULL) {
1865 ret = close(sock);
1866 if (ret < 0) {
1867 PERROR("close register consumer");
1868 }
1869 ret = LTTNG_ERR_FATAL;
1870 goto error;
1871 }
1872
1873 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1874 if (socket->lock == NULL) {
1875 PERROR("zmalloc pthread mutex");
1876 ret = LTTNG_ERR_FATAL;
1877 goto error;
1878 }
1879 pthread_mutex_init(socket->lock, NULL);
1880 socket->registered = 1;
1881
1882 rcu_read_lock();
1883 consumer_add_socket(socket, ksess->consumer);
1884 rcu_read_unlock();
1885
1886 pthread_mutex_lock(&cdata->pid_mutex);
1887 cdata->pid = -1;
1888 pthread_mutex_unlock(&cdata->pid_mutex);
1889
1890 break;
1891 }
1892 default:
1893 /* TODO: Userspace tracing */
1894 ret = LTTNG_ERR_UND;
1895 goto error;
1896 }
1897
1898 ret = LTTNG_OK;
1899
1900 error:
1901 return ret;
1902 }
1903
1904 /*
1905 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1906 */
1907 ssize_t cmd_list_domains(struct ltt_session *session,
1908 struct lttng_domain **domains)
1909 {
1910 int ret, index = 0;
1911 ssize_t nb_dom = 0;
1912
1913 if (session->kernel_session != NULL) {
1914 DBG3("Listing domains found kernel domain");
1915 nb_dom++;
1916 }
1917
1918 if (session->ust_session != NULL) {
1919 DBG3("Listing domains found UST global domain");
1920 nb_dom++;
1921 }
1922
1923 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1924 if (*domains == NULL) {
1925 ret = LTTNG_ERR_FATAL;
1926 goto error;
1927 }
1928
1929 if (session->kernel_session != NULL) {
1930 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1931 index++;
1932 }
1933
1934 if (session->ust_session != NULL) {
1935 (*domains)[index].type = LTTNG_DOMAIN_UST;
1936 index++;
1937 }
1938
1939 return nb_dom;
1940
1941 error:
1942 /* Return negative value to differentiate return code */
1943 return -ret;
1944 }
1945
1946
1947 /*
1948 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1949 */
1950 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1951 struct lttng_channel **channels)
1952 {
1953 int ret;
1954 ssize_t nb_chan = 0;
1955
1956 switch (domain) {
1957 case LTTNG_DOMAIN_KERNEL:
1958 if (session->kernel_session != NULL) {
1959 nb_chan = session->kernel_session->channel_count;
1960 }
1961 DBG3("Number of kernel channels %zd", nb_chan);
1962 if (nb_chan <= 0) {
1963 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1964 }
1965 break;
1966 case LTTNG_DOMAIN_UST:
1967 if (session->ust_session != NULL) {
1968 nb_chan = lttng_ht_get_count(
1969 session->ust_session->domain_global.channels);
1970 }
1971 DBG3("Number of UST global channels %zd", nb_chan);
1972 if (nb_chan <= 0) {
1973 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1974 }
1975 break;
1976 default:
1977 *channels = NULL;
1978 ret = LTTNG_ERR_UND;
1979 goto error;
1980 }
1981
1982 if (nb_chan > 0) {
1983 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1984 if (*channels == NULL) {
1985 ret = LTTNG_ERR_FATAL;
1986 goto error;
1987 }
1988
1989 list_lttng_channels(domain, session, *channels);
1990 } else {
1991 *channels = NULL;
1992 /* Ret value was set in the domain switch case */
1993 goto error;
1994 }
1995
1996 return nb_chan;
1997
1998 error:
1999 /* Return negative value to differentiate return code */
2000 return -ret;
2001 }
2002
2003 /*
2004 * Command LTTNG_LIST_EVENTS processed by the client thread.
2005 */
2006 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2007 char *channel_name, struct lttng_event **events)
2008 {
2009 int ret = 0;
2010 ssize_t nb_event = 0;
2011
2012 switch (domain) {
2013 case LTTNG_DOMAIN_KERNEL:
2014 if (session->kernel_session != NULL) {
2015 nb_event = list_lttng_kernel_events(channel_name,
2016 session->kernel_session, events);
2017 }
2018 break;
2019 case LTTNG_DOMAIN_UST:
2020 {
2021 if (session->ust_session != NULL) {
2022 nb_event = list_lttng_ust_global_events(channel_name,
2023 &session->ust_session->domain_global, events);
2024 }
2025 break;
2026 }
2027 default:
2028 ret = LTTNG_ERR_UND;
2029 goto error;
2030 }
2031
2032 return nb_event;
2033
2034 error:
2035 /* Return negative value to differentiate return code */
2036 return -ret;
2037 }
2038
2039 /*
2040 * Using the session list, filled a lttng_session array to send back to the
2041 * client for session listing.
2042 *
2043 * The session list lock MUST be acquired before calling this function. Use
2044 * session_lock_list() and session_unlock_list().
2045 */
2046 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2047 gid_t gid)
2048 {
2049 int ret;
2050 unsigned int i = 0;
2051 struct ltt_session *session;
2052 struct ltt_session_list *list = session_get_list();
2053
2054 DBG("Getting all available session for UID %d GID %d",
2055 uid, gid);
2056 /*
2057 * Iterate over session list and append data after the control struct in
2058 * the buffer.
2059 */
2060 cds_list_for_each_entry(session, &list->head, list) {
2061 /*
2062 * Only list the sessions the user can control.
2063 */
2064 if (!session_access_ok(session, uid, gid)) {
2065 continue;
2066 }
2067
2068 struct ltt_kernel_session *ksess = session->kernel_session;
2069 struct ltt_ust_session *usess = session->ust_session;
2070
2071 if (session->consumer->type == CONSUMER_DST_NET ||
2072 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2073 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2074 ret = build_network_session_path(sessions[i].path,
2075 sizeof(session[i].path), session);
2076 } else {
2077 ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
2078 session->consumer->dst.trace_path);
2079 }
2080 if (ret < 0) {
2081 PERROR("snprintf session path");
2082 continue;
2083 }
2084
2085 strncpy(sessions[i].name, session->name, NAME_MAX);
2086 sessions[i].name[NAME_MAX - 1] = '\0';
2087 sessions[i].enabled = session->enabled;
2088 i++;
2089 }
2090 }
2091
2092 /*
2093 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2094 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2095 */
2096 int cmd_data_pending(struct ltt_session *session)
2097 {
2098 int ret;
2099 struct ltt_kernel_session *ksess = session->kernel_session;
2100 struct ltt_ust_session *usess = session->ust_session;
2101
2102 assert(session);
2103
2104 /* Session MUST be stopped to ask for data availability. */
2105 if (session->enabled) {
2106 ret = LTTNG_ERR_SESSION_STARTED;
2107 goto error;
2108 }
2109
2110 if (ksess && ksess->consumer) {
2111 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2112 if (ret == 1) {
2113 /* Data is still being extracted for the kernel. */
2114 goto error;
2115 }
2116 }
2117
2118 if (usess && usess->consumer) {
2119 ret = consumer_is_data_pending(usess->id, usess->consumer);
2120 if (ret == 1) {
2121 /* Data is still being extracted for the kernel. */
2122 goto error;
2123 }
2124 }
2125
2126 /* Data is ready to be read by a viewer */
2127 ret = 0;
2128
2129 error:
2130 return ret;
2131 }
2132
2133 /*
2134 * Init command subsystem.
2135 */
2136 void cmd_init(void)
2137 {
2138 /*
2139 * Set network sequence index to 1 for streams to match a relayd socket on
2140 * the consumer side.
2141 */
2142 uatomic_set(&relayd_net_seq_idx, 1);
2143
2144 DBG("Command subsystem initialized");
2145 }
LTTng 2.0 tools and control repository
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