5d2cba1d467befbde02cfcc44183304303259421
[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 "health.h"
32 #include "kernel.h"
33 #include "kernel-consumer.h"
34 #include "lttng-sessiond.h"
35 #include "utils.h"
36
37 #include "cmd.h"
38
39 /*
40 * Used to keep a unique index for each relayd socket created where this value
41 * is associated with streams on the consumer so it can match the right relayd
42 * to send to. It must be accessed with the relayd_net_seq_idx_lock
43 * held.
44 */
45 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
46 static uint64_t 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 || (!kuri && !uuri)) {
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_KRETPROBE:
310 (*events)[i].type = LTTNG_EVENT_FUNCTION;
311 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
312 sizeof(struct lttng_kernel_kprobe));
313 break;
314 case LTTNG_KERNEL_KPROBE:
315 (*events)[i].type = LTTNG_EVENT_PROBE;
316 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
317 sizeof(struct lttng_kernel_kprobe));
318 break;
319 case LTTNG_KERNEL_FUNCTION:
320 (*events)[i].type = LTTNG_EVENT_FUNCTION;
321 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
322 sizeof(struct lttng_kernel_function));
323 break;
324 case LTTNG_KERNEL_NOOP:
325 (*events)[i].type = LTTNG_EVENT_NOOP;
326 break;
327 case LTTNG_KERNEL_SYSCALL:
328 (*events)[i].type = LTTNG_EVENT_SYSCALL;
329 break;
330 case LTTNG_KERNEL_ALL:
331 assert(0);
332 break;
333 }
334 i++;
335 }
336
337 end:
338 return nb_event;
339
340 error:
341 /* Negate the error code to differentiate the size from an error */
342 return -ret;
343 }
344
345 /*
346 * Add URI so the consumer output object. Set the correct path depending on the
347 * domain adding the default trace directory.
348 */
349 static int add_uri_to_consumer(struct consumer_output *consumer,
350 struct lttng_uri *uri, int domain, const char *session_name)
351 {
352 int ret = LTTNG_OK;
353 const char *default_trace_dir;
354
355 assert(uri);
356
357 if (consumer == NULL) {
358 DBG("No consumer detected. Don't add URI. Stopping.");
359 ret = LTTNG_ERR_NO_CONSUMER;
360 goto error;
361 }
362
363 switch (domain) {
364 case LTTNG_DOMAIN_KERNEL:
365 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
366 break;
367 case LTTNG_DOMAIN_UST:
368 default_trace_dir = DEFAULT_UST_TRACE_DIR;
369 break;
370 default:
371 /*
372 * This case is possible is we try to add the URI to the global tracing
373 * session consumer object which in this case there is no subdir.
374 */
375 default_trace_dir = "";
376 }
377
378 switch (uri->dtype) {
379 case LTTNG_DST_IPV4:
380 case LTTNG_DST_IPV6:
381 DBG2("Setting network URI to consumer");
382
383 if (consumer->type == CONSUMER_DST_NET) {
384 if ((uri->stype == LTTNG_STREAM_CONTROL &&
385 consumer->dst.net.control_isset) ||
386 (uri->stype == LTTNG_STREAM_DATA &&
387 consumer->dst.net.data_isset)) {
388 ret = LTTNG_ERR_URL_EXIST;
389 goto error;
390 }
391 } else {
392 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
393 }
394
395 consumer->type = CONSUMER_DST_NET;
396
397 /* Set URI into consumer output object */
398 ret = consumer_set_network_uri(consumer, uri);
399 if (ret < 0) {
400 ret = -ret;
401 goto error;
402 } else if (ret == 1) {
403 /*
404 * URI was the same in the consumer so we do not append the subdir
405 * again so to not duplicate output dir.
406 */
407 goto error;
408 }
409
410 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
411 ret = consumer_set_subdir(consumer, session_name);
412 if (ret < 0) {
413 ret = LTTNG_ERR_FATAL;
414 goto error;
415 }
416 }
417
418 if (uri->stype == LTTNG_STREAM_CONTROL) {
419 /* On a new subdir, reappend the default trace dir. */
420 strncat(consumer->subdir, default_trace_dir,
421 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
422 DBG3("Append domain trace name to subdir %s", consumer->subdir);
423 }
424
425 break;
426 case LTTNG_DST_PATH:
427 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
428 memset(consumer->dst.trace_path, 0,
429 sizeof(consumer->dst.trace_path));
430 strncpy(consumer->dst.trace_path, uri->dst.path,
431 sizeof(consumer->dst.trace_path));
432 /* Append default trace dir */
433 strncat(consumer->dst.trace_path, default_trace_dir,
434 sizeof(consumer->dst.trace_path) -
435 strlen(consumer->dst.trace_path) - 1);
436 /* Flag consumer as local. */
437 consumer->type = CONSUMER_DST_LOCAL;
438 break;
439 }
440
441 ret = LTTNG_OK;
442
443 error:
444 return ret;
445 }
446
447 /*
448 * Init tracing by creating trace directory and sending fds kernel consumer.
449 */
450 static int init_kernel_tracing(struct ltt_kernel_session *session)
451 {
452 int ret = 0;
453 struct lttng_ht_iter iter;
454 struct consumer_socket *socket;
455
456 assert(session);
457
458 rcu_read_lock();
459
460 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
461 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
462 socket, node.node) {
463 /* Code flow error */
464 assert(socket->fd >= 0);
465
466 pthread_mutex_lock(socket->lock);
467 ret = kernel_consumer_send_session(socket, session);
468 pthread_mutex_unlock(socket->lock);
469 if (ret < 0) {
470 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
471 goto error;
472 }
473 }
474 }
475
476 error:
477 rcu_read_unlock();
478 return ret;
479 }
480
481 /*
482 * Create a socket to the relayd using the URI.
483 *
484 * On success, the relayd_sock pointer is set to the created socket.
485 * Else, it's stays untouched and a lttcomm error code is returned.
486 */
487 static int create_connect_relayd(struct lttng_uri *uri,
488 struct lttcomm_relayd_sock **relayd_sock)
489 {
490 int ret;
491 struct lttcomm_relayd_sock *rsock;
492
493 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
494 RELAYD_VERSION_COMM_MINOR);
495 if (!rsock) {
496 ret = LTTNG_ERR_FATAL;
497 goto error;
498 }
499
500 /*
501 * Connect to relayd so we can proceed with a session creation. This call
502 * can possibly block for an arbitrary amount of time to set the health
503 * state to be in poll execution.
504 */
505 health_poll_entry();
506 ret = relayd_connect(rsock);
507 health_poll_exit();
508 if (ret < 0) {
509 ERR("Unable to reach lttng-relayd");
510 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
511 goto free_sock;
512 }
513
514 /* Create socket for control stream. */
515 if (uri->stype == LTTNG_STREAM_CONTROL) {
516 DBG3("Creating relayd stream socket from URI");
517
518 /* Check relayd version */
519 ret = relayd_version_check(rsock);
520 if (ret < 0) {
521 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
522 goto close_sock;
523 }
524 } else if (uri->stype == LTTNG_STREAM_DATA) {
525 DBG3("Creating relayd data socket from URI");
526 } else {
527 /* Command is not valid */
528 ERR("Relayd invalid stream type: %d", uri->stype);
529 ret = LTTNG_ERR_INVALID;
530 goto close_sock;
531 }
532
533 *relayd_sock = rsock;
534
535 return LTTNG_OK;
536
537 close_sock:
538 /* The returned value is not useful since we are on an error path. */
539 (void) relayd_close(rsock);
540 free_sock:
541 free(rsock);
542 error:
543 return ret;
544 }
545
546 /*
547 * Connect to the relayd using URI and send the socket to the right consumer.
548 */
549 static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
550 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
551 struct consumer_socket *consumer_sock)
552 {
553 int ret;
554 struct lttcomm_relayd_sock *rsock = NULL;
555
556 /* Connect to relayd and make version check if uri is the control. */
557 ret = create_connect_relayd(relayd_uri, &rsock);
558 if (ret != LTTNG_OK) {
559 goto error;
560 }
561 assert(rsock);
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 == (uint64_t) -1ULL) {
570 pthread_mutex_lock(&relayd_net_seq_idx_lock);
571 /*
572 * Increment net_seq_idx because we are about to transfer the
573 * new relayd socket to the consumer.
574 * Assign unique key so the consumer can match streams.
575 */
576 consumer->net_seq_index = ++relayd_net_seq_idx;
577 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
578 }
579
580 /* Send relayd socket to consumer. */
581 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
582 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 (void) relayd_close(rsock);
604 free(rsock);
605
606 error:
607 if (ret != LTTNG_OK) {
608 /*
609 * On error, nullify the consumer sequence index so streams are not
610 * associated with it once sent to the consumer.
611 */
612 uatomic_set(&consumer->net_seq_index, -1);
613 }
614 return ret;
615 }
616
617 /*
618 * Send both relayd sockets to a specific consumer and domain. This is a
619 * helper function to facilitate sending the information to the consumer for a
620 * session.
621 */
622 static int send_consumer_relayd_sockets(int domain,
623 struct ltt_session *session, struct consumer_output *consumer,
624 struct consumer_socket *sock)
625 {
626 int ret = LTTNG_OK;
627
628 assert(session);
629 assert(consumer);
630
631 /* Sending control relayd socket. */
632 if (!sock->control_sock_sent) {
633 ret = send_consumer_relayd_socket(domain, session,
634 &consumer->dst.net.control, consumer, sock);
635 if (ret != LTTNG_OK) {
636 goto error;
637 }
638 }
639
640 /* Sending data relayd socket. */
641 if (!sock->data_sock_sent) {
642 ret = send_consumer_relayd_socket(domain, session,
643 &consumer->dst.net.data, consumer, sock);
644 if (ret != LTTNG_OK) {
645 goto error;
646 }
647 }
648
649 error:
650 return ret;
651 }
652
653 /*
654 * Setup relayd connections for a tracing session. First creates the socket to
655 * the relayd and send them to the right domain consumer. Consumer type MUST be
656 * network.
657 */
658 int cmd_setup_relayd(struct ltt_session *session)
659 {
660 int ret = LTTNG_OK;
661 struct ltt_ust_session *usess;
662 struct ltt_kernel_session *ksess;
663 struct consumer_socket *socket;
664 struct lttng_ht_iter iter;
665
666 assert(session);
667
668 usess = session->ust_session;
669 ksess = session->kernel_session;
670
671 DBG("Setting relayd for session %s", session->name);
672
673 rcu_read_lock();
674
675 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
676 && usess->consumer->enabled) {
677 /* For each consumer socket, send relayd sockets */
678 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
679 socket, node.node) {
680 /* Code flow error */
681 assert(socket->fd >= 0);
682
683 pthread_mutex_lock(socket->lock);
684 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
685 usess->consumer, socket);
686 pthread_mutex_unlock(socket->lock);
687 if (ret != LTTNG_OK) {
688 goto error;
689 }
690 }
691 }
692
693 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
694 && ksess->consumer->enabled) {
695 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
696 socket, node.node) {
697 /* Code flow error */
698 assert(socket->fd >= 0);
699
700 pthread_mutex_lock(socket->lock);
701 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
702 ksess->consumer, socket);
703 pthread_mutex_unlock(socket->lock);
704 if (ret != LTTNG_OK) {
705 goto error;
706 }
707 }
708 }
709
710 error:
711 rcu_read_unlock();
712 return ret;
713 }
714
715 /*
716 * Start a kernel session by opening all necessary streams.
717 */
718 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
719 {
720 int ret;
721 struct ltt_kernel_channel *kchan;
722
723 /* Open kernel metadata */
724 if (ksess->metadata == NULL) {
725 ret = kernel_open_metadata(ksess);
726 if (ret < 0) {
727 ret = LTTNG_ERR_KERN_META_FAIL;
728 goto error;
729 }
730 }
731
732 /* Open kernel metadata stream */
733 if (ksess->metadata_stream_fd < 0) {
734 ret = kernel_open_metadata_stream(ksess);
735 if (ret < 0) {
736 ERR("Kernel create metadata stream failed");
737 ret = LTTNG_ERR_KERN_STREAM_FAIL;
738 goto error;
739 }
740 }
741
742 /* For each channel */
743 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
744 if (kchan->stream_count == 0) {
745 ret = kernel_open_channel_stream(kchan);
746 if (ret < 0) {
747 ret = LTTNG_ERR_KERN_STREAM_FAIL;
748 goto error;
749 }
750 /* Update the stream global counter */
751 ksess->stream_count_global += ret;
752 }
753 }
754
755 /* Setup kernel consumer socket and send fds to it */
756 ret = init_kernel_tracing(ksess);
757 if (ret < 0) {
758 ret = LTTNG_ERR_KERN_START_FAIL;
759 goto error;
760 }
761
762 /* This start the kernel tracing */
763 ret = kernel_start_session(ksess);
764 if (ret < 0) {
765 ret = LTTNG_ERR_KERN_START_FAIL;
766 goto error;
767 }
768
769 /* Quiescent wait after starting trace */
770 kernel_wait_quiescent(kernel_tracer_fd);
771
772 ksess->started = 1;
773
774 ret = LTTNG_OK;
775
776 error:
777 return ret;
778 }
779
780 /*
781 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
782 */
783 int cmd_disable_channel(struct ltt_session *session, int domain,
784 char *channel_name)
785 {
786 int ret;
787 struct ltt_ust_session *usess;
788
789 usess = session->ust_session;
790
791 rcu_read_lock();
792
793 switch (domain) {
794 case LTTNG_DOMAIN_KERNEL:
795 {
796 ret = channel_kernel_disable(session->kernel_session,
797 channel_name);
798 if (ret != LTTNG_OK) {
799 goto error;
800 }
801
802 kernel_wait_quiescent(kernel_tracer_fd);
803 break;
804 }
805 case LTTNG_DOMAIN_UST:
806 {
807 struct ltt_ust_channel *uchan;
808 struct lttng_ht *chan_ht;
809
810 chan_ht = usess->domain_global.channels;
811
812 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
813 if (uchan == NULL) {
814 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
815 goto error;
816 }
817
818 ret = channel_ust_disable(usess, uchan);
819 if (ret != LTTNG_OK) {
820 goto error;
821 }
822 break;
823 }
824 #if 0
825 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
826 case LTTNG_DOMAIN_UST_EXEC_NAME:
827 case LTTNG_DOMAIN_UST_PID:
828 #endif
829 default:
830 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
831 goto error;
832 }
833
834 ret = LTTNG_OK;
835
836 error:
837 rcu_read_unlock();
838 return ret;
839 }
840
841 /*
842 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
843 *
844 * The wpipe arguments is used as a notifier for the kernel thread.
845 */
846 int cmd_enable_channel(struct ltt_session *session,
847 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
848 {
849 int ret;
850 struct ltt_ust_session *usess = session->ust_session;
851 struct lttng_ht *chan_ht;
852
853 assert(session);
854 assert(attr);
855 assert(domain);
856
857 DBG("Enabling channel %s for session %s", attr->name, session->name);
858
859 rcu_read_lock();
860
861 switch (domain->type) {
862 case LTTNG_DOMAIN_KERNEL:
863 {
864 struct ltt_kernel_channel *kchan;
865
866 kchan = trace_kernel_get_channel_by_name(attr->name,
867 session->kernel_session);
868 if (kchan == NULL) {
869 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
870 } else {
871 ret = channel_kernel_enable(session->kernel_session, kchan);
872 }
873
874 if (ret != LTTNG_OK) {
875 goto error;
876 }
877
878 kernel_wait_quiescent(kernel_tracer_fd);
879
880 /*
881 * If the session was previously started, start as well this newly
882 * created kernel session so the events/channels enabled *after* the
883 * start actually work.
884 */
885 if (session->started && !session->kernel_session->started) {
886 ret = start_kernel_session(session->kernel_session, wpipe);
887 if (ret != LTTNG_OK) {
888 goto error;
889 }
890 }
891 break;
892 }
893 case LTTNG_DOMAIN_UST:
894 {
895 struct ltt_ust_channel *uchan;
896
897 chan_ht = usess->domain_global.channels;
898
899 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
900 if (uchan == NULL) {
901 ret = channel_ust_create(usess, attr, domain->buf_type);
902 } else {
903 ret = channel_ust_enable(usess, uchan);
904 }
905
906 /* Start the UST session if the session was already started. */
907 if (session->started && !usess->start_trace) {
908 ret = ust_app_start_trace_all(usess);
909 if (ret < 0) {
910 ret = LTTNG_ERR_UST_START_FAIL;
911 goto error;
912 }
913 ret = LTTNG_OK;
914 usess->start_trace = 1;
915 }
916 break;
917 }
918 default:
919 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
920 goto error;
921 }
922
923 error:
924 rcu_read_unlock();
925 return ret;
926 }
927
928
929 /*
930 * Command LTTNG_DISABLE_EVENT processed by the client thread.
931 */
932 int cmd_disable_event(struct ltt_session *session, int domain,
933 char *channel_name, char *event_name)
934 {
935 int ret;
936
937 rcu_read_lock();
938
939 switch (domain) {
940 case LTTNG_DOMAIN_KERNEL:
941 {
942 struct ltt_kernel_channel *kchan;
943 struct ltt_kernel_session *ksess;
944
945 ksess = session->kernel_session;
946
947 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
948 if (kchan == NULL) {
949 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
950 goto error;
951 }
952
953 ret = event_kernel_disable_tracepoint(kchan, event_name);
954 if (ret != LTTNG_OK) {
955 goto error;
956 }
957
958 kernel_wait_quiescent(kernel_tracer_fd);
959 break;
960 }
961 case LTTNG_DOMAIN_UST:
962 {
963 struct ltt_ust_channel *uchan;
964 struct ltt_ust_session *usess;
965
966 usess = session->ust_session;
967
968 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
969 channel_name);
970 if (uchan == NULL) {
971 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
972 goto error;
973 }
974
975 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
976 if (ret != LTTNG_OK) {
977 goto error;
978 }
979
980 DBG3("Disable UST event %s in channel %s completed", event_name,
981 channel_name);
982 break;
983 }
984 #if 0
985 case LTTNG_DOMAIN_UST_EXEC_NAME:
986 case LTTNG_DOMAIN_UST_PID:
987 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
988 #endif
989 default:
990 ret = LTTNG_ERR_UND;
991 goto error;
992 }
993
994 ret = LTTNG_OK;
995
996 error:
997 rcu_read_unlock();
998 return ret;
999 }
1000
1001 /*
1002 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1003 */
1004 int cmd_disable_event_all(struct ltt_session *session, int domain,
1005 char *channel_name)
1006 {
1007 int ret;
1008
1009 rcu_read_lock();
1010
1011 switch (domain) {
1012 case LTTNG_DOMAIN_KERNEL:
1013 {
1014 struct ltt_kernel_session *ksess;
1015 struct ltt_kernel_channel *kchan;
1016
1017 ksess = session->kernel_session;
1018
1019 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1020 if (kchan == NULL) {
1021 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1022 goto error;
1023 }
1024
1025 ret = event_kernel_disable_all(kchan);
1026 if (ret != LTTNG_OK) {
1027 goto error;
1028 }
1029
1030 kernel_wait_quiescent(kernel_tracer_fd);
1031 break;
1032 }
1033 case LTTNG_DOMAIN_UST:
1034 {
1035 struct ltt_ust_session *usess;
1036 struct ltt_ust_channel *uchan;
1037
1038 usess = session->ust_session;
1039
1040 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1041 channel_name);
1042 if (uchan == NULL) {
1043 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1044 goto error;
1045 }
1046
1047 ret = event_ust_disable_all_tracepoints(usess, uchan);
1048 if (ret != 0) {
1049 goto error;
1050 }
1051
1052 DBG3("Disable all UST events in channel %s completed", channel_name);
1053
1054 break;
1055 }
1056 #if 0
1057 case LTTNG_DOMAIN_UST_EXEC_NAME:
1058 case LTTNG_DOMAIN_UST_PID:
1059 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1060 #endif
1061 default:
1062 ret = LTTNG_ERR_UND;
1063 goto error;
1064 }
1065
1066 ret = LTTNG_OK;
1067
1068 error:
1069 rcu_read_unlock();
1070 return ret;
1071 }
1072
1073 /*
1074 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1075 */
1076 int cmd_add_context(struct ltt_session *session, int domain,
1077 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1078 {
1079 int ret;
1080
1081 switch (domain) {
1082 case LTTNG_DOMAIN_KERNEL:
1083 assert(session->kernel_session);
1084
1085 if (session->kernel_session->channel_count == 0) {
1086 /* Create default channel */
1087 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1088 if (ret != LTTNG_OK) {
1089 goto error;
1090 }
1091 }
1092
1093 /* Add kernel context to kernel tracer */
1094 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1095 if (ret != LTTNG_OK) {
1096 goto error;
1097 }
1098 break;
1099 case LTTNG_DOMAIN_UST:
1100 {
1101 struct ltt_ust_session *usess = session->ust_session;
1102 assert(usess);
1103
1104 unsigned int chan_count =
1105 lttng_ht_get_count(usess->domain_global.channels);
1106 if (chan_count == 0) {
1107 struct lttng_channel *attr;
1108 /* Create default channel */
1109 attr = channel_new_default_attr(domain);
1110 if (attr == NULL) {
1111 ret = LTTNG_ERR_FATAL;
1112 goto error;
1113 }
1114
1115 ret = channel_ust_create(usess, attr, usess->buffer_type);
1116 if (ret != LTTNG_OK) {
1117 free(attr);
1118 goto error;
1119 }
1120 free(attr);
1121 }
1122
1123 ret = context_ust_add(usess, domain, ctx, channel_name);
1124 if (ret != LTTNG_OK) {
1125 goto error;
1126 }
1127 break;
1128 }
1129 #if 0
1130 case LTTNG_DOMAIN_UST_EXEC_NAME:
1131 case LTTNG_DOMAIN_UST_PID:
1132 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1133 #endif
1134 default:
1135 ret = LTTNG_ERR_UND;
1136 goto error;
1137 }
1138
1139 ret = LTTNG_OK;
1140
1141 error:
1142 return ret;
1143 }
1144
1145 /*
1146 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1147 */
1148 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1149 char *channel_name, struct lttng_event *event,
1150 struct lttng_filter_bytecode *filter, int wpipe)
1151 {
1152 int ret, channel_created = 0;
1153 struct lttng_channel *attr;
1154
1155 assert(session);
1156 assert(event);
1157 assert(channel_name);
1158
1159 rcu_read_lock();
1160
1161 switch (domain->type) {
1162 case LTTNG_DOMAIN_KERNEL:
1163 {
1164 struct ltt_kernel_channel *kchan;
1165
1166 kchan = trace_kernel_get_channel_by_name(channel_name,
1167 session->kernel_session);
1168 if (kchan == NULL) {
1169 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
1170 if (attr == NULL) {
1171 ret = LTTNG_ERR_FATAL;
1172 goto error;
1173 }
1174 strncpy(attr->name, channel_name, sizeof(attr->name));
1175
1176 ret = cmd_enable_channel(session, domain, attr, wpipe);
1177 if (ret != LTTNG_OK) {
1178 free(attr);
1179 goto error;
1180 }
1181 free(attr);
1182
1183 channel_created = 1;
1184 }
1185
1186 /* Get the newly created kernel channel pointer */
1187 kchan = trace_kernel_get_channel_by_name(channel_name,
1188 session->kernel_session);
1189 if (kchan == NULL) {
1190 /* This sould not happen... */
1191 ret = LTTNG_ERR_FATAL;
1192 goto error;
1193 }
1194
1195 ret = event_kernel_enable_tracepoint(kchan, event);
1196 if (ret != LTTNG_OK) {
1197 if (channel_created) {
1198 /* Let's not leak a useless channel. */
1199 kernel_destroy_channel(kchan);
1200 }
1201 goto error;
1202 }
1203
1204 kernel_wait_quiescent(kernel_tracer_fd);
1205 break;
1206 }
1207 case LTTNG_DOMAIN_UST:
1208 {
1209 struct ltt_ust_channel *uchan;
1210 struct ltt_ust_session *usess = session->ust_session;
1211
1212 assert(usess);
1213
1214 /* Get channel from global UST domain */
1215 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1216 channel_name);
1217 if (uchan == NULL) {
1218 /* Create default channel */
1219 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
1220 if (attr == NULL) {
1221 ret = LTTNG_ERR_FATAL;
1222 goto error;
1223 }
1224 strncpy(attr->name, channel_name, sizeof(attr->name));
1225
1226 ret = cmd_enable_channel(session, domain, attr, wpipe);
1227 if (ret != LTTNG_OK) {
1228 free(attr);
1229 goto error;
1230 }
1231 free(attr);
1232
1233 /* Get the newly created channel reference back */
1234 uchan = trace_ust_find_channel_by_name(
1235 usess->domain_global.channels, channel_name);
1236 assert(uchan);
1237 }
1238
1239 /* At this point, the session and channel exist on the tracer */
1240 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1241 if (ret != LTTNG_OK) {
1242 goto error;
1243 }
1244 break;
1245 }
1246 #if 0
1247 case LTTNG_DOMAIN_UST_EXEC_NAME:
1248 case LTTNG_DOMAIN_UST_PID:
1249 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1250 #endif
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_ENABLE_ALL_EVENT processed by the client thread.
1265 */
1266 int cmd_enable_event_all(struct ltt_session *session,
1267 struct lttng_domain *domain, char *channel_name, int event_type,
1268 struct lttng_filter_bytecode *filter, int wpipe)
1269 {
1270 int ret;
1271 struct lttng_channel *attr;
1272
1273 assert(session);
1274 assert(channel_name);
1275
1276 rcu_read_lock();
1277
1278 switch (domain->type) {
1279 case LTTNG_DOMAIN_KERNEL:
1280 {
1281 struct ltt_kernel_channel *kchan;
1282
1283 assert(session->kernel_session);
1284
1285 kchan = trace_kernel_get_channel_by_name(channel_name,
1286 session->kernel_session);
1287 if (kchan == NULL) {
1288 /* Create default channel */
1289 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
1290 if (attr == NULL) {
1291 ret = LTTNG_ERR_FATAL;
1292 goto error;
1293 }
1294 strncpy(attr->name, channel_name, sizeof(attr->name));
1295
1296 ret = cmd_enable_channel(session, domain, attr, wpipe);
1297 if (ret != LTTNG_OK) {
1298 free(attr);
1299 goto error;
1300 }
1301 free(attr);
1302
1303 /* Get the newly created kernel channel pointer */
1304 kchan = trace_kernel_get_channel_by_name(channel_name,
1305 session->kernel_session);
1306 assert(kchan);
1307 }
1308
1309 switch (event_type) {
1310 case LTTNG_EVENT_SYSCALL:
1311 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1312 break;
1313 case LTTNG_EVENT_TRACEPOINT:
1314 /*
1315 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1316 * events already registered to the channel.
1317 */
1318 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1319 break;
1320 case LTTNG_EVENT_ALL:
1321 /* Enable syscalls and tracepoints */
1322 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1323 break;
1324 default:
1325 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1326 goto error;
1327 }
1328
1329 /* Manage return value */
1330 if (ret != LTTNG_OK) {
1331 /*
1332 * On error, cmd_enable_channel call will take care of destroying
1333 * the created channel if it was needed.
1334 */
1335 goto error;
1336 }
1337
1338 kernel_wait_quiescent(kernel_tracer_fd);
1339 break;
1340 }
1341 case LTTNG_DOMAIN_UST:
1342 {
1343 struct ltt_ust_channel *uchan;
1344 struct ltt_ust_session *usess = session->ust_session;
1345
1346 assert(usess);
1347
1348 /* Get channel from global UST domain */
1349 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1350 channel_name);
1351 if (uchan == NULL) {
1352 /* Create default channel */
1353 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
1354 if (attr == NULL) {
1355 ret = LTTNG_ERR_FATAL;
1356 goto error;
1357 }
1358 strncpy(attr->name, channel_name, sizeof(attr->name));
1359
1360 ret = cmd_enable_channel(session, domain, attr, wpipe);
1361 if (ret != LTTNG_OK) {
1362 free(attr);
1363 goto error;
1364 }
1365 free(attr);
1366
1367 /* Get the newly created channel reference back */
1368 uchan = trace_ust_find_channel_by_name(
1369 usess->domain_global.channels, channel_name);
1370 assert(uchan);
1371 }
1372
1373 /* At this point, the session and channel exist on the tracer */
1374
1375 switch (event_type) {
1376 case LTTNG_EVENT_ALL:
1377 case LTTNG_EVENT_TRACEPOINT:
1378 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1379 if (ret != LTTNG_OK) {
1380 goto error;
1381 }
1382 break;
1383 default:
1384 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1385 goto error;
1386 }
1387
1388 /* Manage return value */
1389 if (ret != LTTNG_OK) {
1390 goto error;
1391 }
1392
1393 break;
1394 }
1395 #if 0
1396 case LTTNG_DOMAIN_UST_EXEC_NAME:
1397 case LTTNG_DOMAIN_UST_PID:
1398 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1399 #endif
1400 default:
1401 ret = LTTNG_ERR_UND;
1402 goto error;
1403 }
1404
1405 ret = LTTNG_OK;
1406
1407 error:
1408 rcu_read_unlock();
1409 return ret;
1410 }
1411
1412
1413 /*
1414 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1415 */
1416 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1417 {
1418 int ret;
1419 ssize_t nb_events = 0;
1420
1421 switch (domain) {
1422 case LTTNG_DOMAIN_KERNEL:
1423 nb_events = kernel_list_events(kernel_tracer_fd, events);
1424 if (nb_events < 0) {
1425 ret = LTTNG_ERR_KERN_LIST_FAIL;
1426 goto error;
1427 }
1428 break;
1429 case LTTNG_DOMAIN_UST:
1430 nb_events = ust_app_list_events(events);
1431 if (nb_events < 0) {
1432 ret = LTTNG_ERR_UST_LIST_FAIL;
1433 goto error;
1434 }
1435 break;
1436 default:
1437 ret = LTTNG_ERR_UND;
1438 goto error;
1439 }
1440
1441 return nb_events;
1442
1443 error:
1444 /* Return negative value to differentiate return code */
1445 return -ret;
1446 }
1447
1448 /*
1449 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1450 */
1451 ssize_t cmd_list_tracepoint_fields(int domain,
1452 struct lttng_event_field **fields)
1453 {
1454 int ret;
1455 ssize_t nb_fields = 0;
1456
1457 switch (domain) {
1458 case LTTNG_DOMAIN_UST:
1459 nb_fields = ust_app_list_event_fields(fields);
1460 if (nb_fields < 0) {
1461 ret = LTTNG_ERR_UST_LIST_FAIL;
1462 goto error;
1463 }
1464 break;
1465 case LTTNG_DOMAIN_KERNEL:
1466 default: /* fall-through */
1467 ret = LTTNG_ERR_UND;
1468 goto error;
1469 }
1470
1471 return nb_fields;
1472
1473 error:
1474 /* Return negative value to differentiate return code */
1475 return -ret;
1476 }
1477
1478 /*
1479 * Command LTTNG_START_TRACE processed by the client thread.
1480 */
1481 int cmd_start_trace(struct ltt_session *session)
1482 {
1483 int ret;
1484 struct ltt_kernel_session *ksession;
1485 struct ltt_ust_session *usess;
1486
1487 assert(session);
1488
1489 /* Ease our life a bit ;) */
1490 ksession = session->kernel_session;
1491 usess = session->ust_session;
1492
1493 if (session->enabled) {
1494 /* Already started. */
1495 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1496 goto error;
1497 }
1498
1499 session->enabled = 1;
1500
1501 /* Kernel tracing */
1502 if (ksession != NULL) {
1503 ret = start_kernel_session(ksession, kernel_tracer_fd);
1504 if (ret != LTTNG_OK) {
1505 goto error;
1506 }
1507 }
1508
1509 /* Flag session that trace should start automatically */
1510 if (usess) {
1511 usess->start_trace = 1;
1512
1513 ret = ust_app_start_trace_all(usess);
1514 if (ret < 0) {
1515 ret = LTTNG_ERR_UST_START_FAIL;
1516 goto error;
1517 }
1518 }
1519
1520 session->started = 1;
1521
1522 ret = LTTNG_OK;
1523
1524 error:
1525 return ret;
1526 }
1527
1528 /*
1529 * Command LTTNG_STOP_TRACE processed by the client thread.
1530 */
1531 int cmd_stop_trace(struct ltt_session *session)
1532 {
1533 int ret;
1534 struct ltt_kernel_channel *kchan;
1535 struct ltt_kernel_session *ksession;
1536 struct ltt_ust_session *usess;
1537
1538 assert(session);
1539
1540 /* Short cut */
1541 ksession = session->kernel_session;
1542 usess = session->ust_session;
1543
1544 if (!session->enabled) {
1545 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1546 goto error;
1547 }
1548
1549 session->enabled = 0;
1550
1551 /* Kernel tracer */
1552 if (ksession) {
1553 DBG("Stop kernel tracing");
1554
1555 /* Flush metadata if exist */
1556 if (ksession->metadata_stream_fd >= 0) {
1557 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1558 if (ret < 0) {
1559 ERR("Kernel metadata flush failed");
1560 }
1561 }
1562
1563 /* Flush all buffers before stopping */
1564 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1565 ret = kernel_flush_buffer(kchan);
1566 if (ret < 0) {
1567 ERR("Kernel flush buffer error");
1568 }
1569 }
1570
1571 ret = kernel_stop_session(ksession);
1572 if (ret < 0) {
1573 ret = LTTNG_ERR_KERN_STOP_FAIL;
1574 goto error;
1575 }
1576
1577 kernel_wait_quiescent(kernel_tracer_fd);
1578
1579 ksession->started = 0;
1580 }
1581
1582 if (usess) {
1583 usess->start_trace = 0;
1584
1585 ret = ust_app_stop_trace_all(usess);
1586 if (ret < 0) {
1587 ret = LTTNG_ERR_UST_STOP_FAIL;
1588 goto error;
1589 }
1590 }
1591
1592 session->started = 0;
1593
1594 ret = LTTNG_OK;
1595
1596 error:
1597 return ret;
1598 }
1599
1600 /*
1601 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1602 */
1603 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1604 size_t nb_uri, struct lttng_uri *uris)
1605 {
1606 int ret, i;
1607 struct ltt_kernel_session *ksess = session->kernel_session;
1608 struct ltt_ust_session *usess = session->ust_session;
1609 struct consumer_output *consumer = NULL;
1610
1611 assert(session);
1612 assert(uris);
1613 assert(nb_uri > 0);
1614
1615 /* Can't enable consumer after session started. */
1616 if (session->enabled) {
1617 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1618 goto error;
1619 }
1620
1621 /*
1622 * This case switch makes sure the domain session has a temporary consumer
1623 * so the URL can be set.
1624 */
1625 switch (domain) {
1626 case 0:
1627 /* Code flow error. A session MUST always have a consumer object */
1628 assert(session->consumer);
1629 /*
1630 * The URL will be added to the tracing session consumer instead of a
1631 * specific domain consumer.
1632 */
1633 consumer = session->consumer;
1634 break;
1635 case LTTNG_DOMAIN_KERNEL:
1636 /* Code flow error if we don't have a kernel session here. */
1637 assert(ksess);
1638 assert(ksess->consumer);
1639 consumer = ksess->consumer;
1640 break;
1641 case LTTNG_DOMAIN_UST:
1642 /* Code flow error if we don't have a kernel session here. */
1643 assert(usess);
1644 assert(usess->consumer);
1645 consumer = usess->consumer;
1646 break;
1647 }
1648
1649 for (i = 0; i < nb_uri; i++) {
1650 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1651 if (ret != LTTNG_OK) {
1652 goto error;
1653 }
1654 }
1655
1656 /* All good! */
1657 ret = LTTNG_OK;
1658
1659 error:
1660 return ret;
1661 }
1662
1663 /*
1664 * Command LTTNG_CREATE_SESSION processed by the client thread.
1665 */
1666 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1667 size_t nb_uri, lttng_sock_cred *creds)
1668 {
1669 int ret;
1670 struct ltt_session *session;
1671
1672 assert(name);
1673
1674 /* No URIs is not possible. */
1675 if (uris == NULL) {
1676 ret = LTTNG_ERR_SESSION_FAIL;
1677 goto session_error;
1678 }
1679
1680 /*
1681 * Verify if the session already exist
1682 *
1683 * XXX: There is no need for the session lock list here since the caller
1684 * (process_client_msg) is holding it. We might want to change that so a
1685 * single command does not lock the entire session list.
1686 */
1687 session = session_find_by_name(name);
1688 if (session != NULL) {
1689 ret = LTTNG_ERR_EXIST_SESS;
1690 goto find_error;
1691 }
1692
1693 /* Create tracing session in the registry */
1694 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1695 LTTNG_SOCK_GET_GID_CRED(creds));
1696 if (ret != LTTNG_OK) {
1697 goto session_error;
1698 }
1699
1700 /*
1701 * Get the newly created session pointer back
1702 *
1703 * XXX: There is no need for the session lock list here since the caller
1704 * (process_client_msg) is holding it. We might want to change that so a
1705 * single command does not lock the entire session list.
1706 */
1707 session = session_find_by_name(name);
1708 assert(session);
1709
1710 /* Create default consumer output for the session not yet created. */
1711 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1712 if (session->consumer == NULL) {
1713 ret = LTTNG_ERR_FATAL;
1714 goto consumer_error;
1715 }
1716
1717 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1718 if (ret != LTTNG_OK) {
1719 goto consumer_error;
1720 }
1721
1722 session->consumer->enabled = 1;
1723
1724 return LTTNG_OK;
1725
1726 consumer_error:
1727 session_destroy(session);
1728 session_error:
1729 find_error:
1730 return ret;
1731 }
1732
1733 /*
1734 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1735 */
1736 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1737 {
1738 int ret;
1739 struct ltt_ust_session *usess;
1740 struct ltt_kernel_session *ksess;
1741
1742 /* Safety net */
1743 assert(session);
1744
1745 usess = session->ust_session;
1746 ksess = session->kernel_session;
1747
1748 /* Clean kernel session teardown */
1749 kernel_destroy_session(ksess);
1750
1751 /* UST session teardown */
1752 if (usess) {
1753 /* Close any relayd session */
1754 consumer_output_send_destroy_relayd(usess->consumer);
1755
1756 /* Destroy every UST application related to this session. */
1757 ret = ust_app_destroy_trace_all(usess);
1758 if (ret) {
1759 ERR("Error in ust_app_destroy_trace_all");
1760 }
1761
1762 /* Clean up the rest. */
1763 trace_ust_destroy_session(usess);
1764 }
1765
1766 /*
1767 * Must notify the kernel thread here to update it's poll set in order to
1768 * remove the channel(s)' fd just destroyed.
1769 */
1770 ret = notify_thread_pipe(wpipe);
1771 if (ret < 0) {
1772 PERROR("write kernel poll pipe");
1773 }
1774
1775 ret = session_destroy(session);
1776
1777 return ret;
1778 }
1779
1780 /*
1781 * Command LTTNG_CALIBRATE processed by the client thread.
1782 */
1783 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1784 {
1785 int ret;
1786
1787 switch (domain) {
1788 case LTTNG_DOMAIN_KERNEL:
1789 {
1790 struct lttng_kernel_calibrate kcalibrate;
1791
1792 kcalibrate.type = calibrate->type;
1793 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1794 if (ret < 0) {
1795 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1796 goto error;
1797 }
1798 break;
1799 }
1800 case LTTNG_DOMAIN_UST:
1801 {
1802 struct lttng_ust_calibrate ucalibrate;
1803
1804 ucalibrate.type = calibrate->type;
1805 ret = ust_app_calibrate_glb(&ucalibrate);
1806 if (ret < 0) {
1807 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1808 goto error;
1809 }
1810 break;
1811 }
1812 default:
1813 ret = LTTNG_ERR_UND;
1814 goto error;
1815 }
1816
1817 ret = LTTNG_OK;
1818
1819 error:
1820 return ret;
1821 }
1822
1823 /*
1824 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1825 */
1826 int cmd_register_consumer(struct ltt_session *session, int domain,
1827 const char *sock_path, struct consumer_data *cdata)
1828 {
1829 int ret, sock;
1830 struct consumer_socket *socket;
1831
1832 assert(session);
1833 assert(cdata);
1834 assert(sock_path);
1835
1836 switch (domain) {
1837 case LTTNG_DOMAIN_KERNEL:
1838 {
1839 struct ltt_kernel_session *ksess = session->kernel_session;
1840
1841 assert(ksess);
1842
1843 /* Can't register a consumer if there is already one */
1844 if (ksess->consumer_fds_sent != 0) {
1845 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1846 goto error;
1847 }
1848
1849 sock = lttcomm_connect_unix_sock(sock_path);
1850 if (sock < 0) {
1851 ret = LTTNG_ERR_CONNECT_FAIL;
1852 goto error;
1853 }
1854
1855 socket = consumer_allocate_socket(sock);
1856 if (socket == NULL) {
1857 ret = close(sock);
1858 if (ret < 0) {
1859 PERROR("close register consumer");
1860 }
1861 ret = LTTNG_ERR_FATAL;
1862 goto error;
1863 }
1864
1865 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1866 if (socket->lock == NULL) {
1867 PERROR("zmalloc pthread mutex");
1868 ret = LTTNG_ERR_FATAL;
1869 goto error;
1870 }
1871 pthread_mutex_init(socket->lock, NULL);
1872 socket->registered = 1;
1873
1874 rcu_read_lock();
1875 consumer_add_socket(socket, ksess->consumer);
1876 rcu_read_unlock();
1877
1878 pthread_mutex_lock(&cdata->pid_mutex);
1879 cdata->pid = -1;
1880 pthread_mutex_unlock(&cdata->pid_mutex);
1881
1882 break;
1883 }
1884 default:
1885 /* TODO: Userspace tracing */
1886 ret = LTTNG_ERR_UND;
1887 goto error;
1888 }
1889
1890 ret = LTTNG_OK;
1891
1892 error:
1893 return ret;
1894 }
1895
1896 /*
1897 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1898 */
1899 ssize_t cmd_list_domains(struct ltt_session *session,
1900 struct lttng_domain **domains)
1901 {
1902 int ret, index = 0;
1903 ssize_t nb_dom = 0;
1904
1905 if (session->kernel_session != NULL) {
1906 DBG3("Listing domains found kernel domain");
1907 nb_dom++;
1908 }
1909
1910 if (session->ust_session != NULL) {
1911 DBG3("Listing domains found UST global domain");
1912 nb_dom++;
1913 }
1914
1915 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1916 if (*domains == NULL) {
1917 ret = LTTNG_ERR_FATAL;
1918 goto error;
1919 }
1920
1921 if (session->kernel_session != NULL) {
1922 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1923 index++;
1924 }
1925
1926 if (session->ust_session != NULL) {
1927 (*domains)[index].type = LTTNG_DOMAIN_UST;
1928 (*domains)[index].buf_type = session->ust_session->buffer_type;
1929 index++;
1930 }
1931
1932 return nb_dom;
1933
1934 error:
1935 /* Return negative value to differentiate return code */
1936 return -ret;
1937 }
1938
1939
1940 /*
1941 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1942 */
1943 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1944 struct lttng_channel **channels)
1945 {
1946 int ret;
1947 ssize_t nb_chan = 0;
1948
1949 switch (domain) {
1950 case LTTNG_DOMAIN_KERNEL:
1951 if (session->kernel_session != NULL) {
1952 nb_chan = session->kernel_session->channel_count;
1953 }
1954 DBG3("Number of kernel channels %zd", nb_chan);
1955 if (nb_chan <= 0) {
1956 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1957 }
1958 break;
1959 case LTTNG_DOMAIN_UST:
1960 if (session->ust_session != NULL) {
1961 nb_chan = lttng_ht_get_count(
1962 session->ust_session->domain_global.channels);
1963 }
1964 DBG3("Number of UST global channels %zd", nb_chan);
1965 if (nb_chan <= 0) {
1966 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1967 }
1968 break;
1969 default:
1970 *channels = NULL;
1971 ret = LTTNG_ERR_UND;
1972 goto error;
1973 }
1974
1975 if (nb_chan > 0) {
1976 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1977 if (*channels == NULL) {
1978 ret = LTTNG_ERR_FATAL;
1979 goto error;
1980 }
1981
1982 list_lttng_channels(domain, session, *channels);
1983 } else {
1984 *channels = NULL;
1985 /* Ret value was set in the domain switch case */
1986 goto error;
1987 }
1988
1989 return nb_chan;
1990
1991 error:
1992 /* Return negative value to differentiate return code */
1993 return -ret;
1994 }
1995
1996 /*
1997 * Command LTTNG_LIST_EVENTS processed by the client thread.
1998 */
1999 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2000 char *channel_name, struct lttng_event **events)
2001 {
2002 int ret = 0;
2003 ssize_t nb_event = 0;
2004
2005 switch (domain) {
2006 case LTTNG_DOMAIN_KERNEL:
2007 if (session->kernel_session != NULL) {
2008 nb_event = list_lttng_kernel_events(channel_name,
2009 session->kernel_session, events);
2010 }
2011 break;
2012 case LTTNG_DOMAIN_UST:
2013 {
2014 if (session->ust_session != NULL) {
2015 nb_event = list_lttng_ust_global_events(channel_name,
2016 &session->ust_session->domain_global, events);
2017 }
2018 break;
2019 }
2020 default:
2021 ret = LTTNG_ERR_UND;
2022 goto error;
2023 }
2024
2025 return nb_event;
2026
2027 error:
2028 /* Return negative value to differentiate return code */
2029 return -ret;
2030 }
2031
2032 /*
2033 * Using the session list, filled a lttng_session array to send back to the
2034 * client for session listing.
2035 *
2036 * The session list lock MUST be acquired before calling this function. Use
2037 * session_lock_list() and session_unlock_list().
2038 */
2039 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2040 gid_t gid)
2041 {
2042 int ret;
2043 unsigned int i = 0;
2044 struct ltt_session *session;
2045 struct ltt_session_list *list = session_get_list();
2046
2047 DBG("Getting all available session for UID %d GID %d",
2048 uid, gid);
2049 /*
2050 * Iterate over session list and append data after the control struct in
2051 * the buffer.
2052 */
2053 cds_list_for_each_entry(session, &list->head, list) {
2054 /*
2055 * Only list the sessions the user can control.
2056 */
2057 if (!session_access_ok(session, uid, gid)) {
2058 continue;
2059 }
2060
2061 struct ltt_kernel_session *ksess = session->kernel_session;
2062 struct ltt_ust_session *usess = session->ust_session;
2063
2064 if (session->consumer->type == CONSUMER_DST_NET ||
2065 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2066 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2067 ret = build_network_session_path(sessions[i].path,
2068 sizeof(sessions[i].path), session);
2069 } else {
2070 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2071 session->consumer->dst.trace_path);
2072 }
2073 if (ret < 0) {
2074 PERROR("snprintf session path");
2075 continue;
2076 }
2077
2078 strncpy(sessions[i].name, session->name, NAME_MAX);
2079 sessions[i].name[NAME_MAX - 1] = '\0';
2080 sessions[i].enabled = session->enabled;
2081 i++;
2082 }
2083 }
2084
2085 /*
2086 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2087 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2088 */
2089 int cmd_data_pending(struct ltt_session *session)
2090 {
2091 int ret;
2092 struct ltt_kernel_session *ksess = session->kernel_session;
2093 struct ltt_ust_session *usess = session->ust_session;
2094
2095 assert(session);
2096
2097 /* Session MUST be stopped to ask for data availability. */
2098 if (session->enabled) {
2099 ret = LTTNG_ERR_SESSION_STARTED;
2100 goto error;
2101 }
2102
2103 if (ksess && ksess->consumer) {
2104 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2105 if (ret == 1) {
2106 /* Data is still being extracted for the kernel. */
2107 goto error;
2108 }
2109 }
2110
2111 if (usess && usess->consumer) {
2112 ret = consumer_is_data_pending(usess->id, usess->consumer);
2113 if (ret == 1) {
2114 /* Data is still being extracted for the kernel. */
2115 goto error;
2116 }
2117 }
2118
2119 /* Data is ready to be read by a viewer */
2120 ret = 0;
2121
2122 error:
2123 return ret;
2124 }
2125
2126 /*
2127 * Init command subsystem.
2128 */
2129 void cmd_init(void)
2130 {
2131 /*
2132 * Set network sequence index to 1 for streams to match a relayd
2133 * socket on the consumer side.
2134 */
2135 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2136 relayd_net_seq_idx = 1;
2137 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2138
2139 DBG("Command subsystem initialized");
2140 }
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