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Introduce the relayd socket object
[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) {
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 consumer->type = CONSUMER_DST_NET;
384
385 if ((uri->stype == LTTNG_STREAM_CONTROL &&
386 consumer->dst.net.control_isset) ||
387 (uri->stype == LTTNG_STREAM_DATA &&
388 consumer->dst.net.data_isset)) {
389 ret = LTTNG_ERR_URL_EXIST;
390 goto error;
391 }
392
393 /* Set URI into consumer output object */
394 ret = consumer_set_network_uri(consumer, uri);
395 if (ret < 0) {
396 ret = LTTNG_ERR_FATAL;
397 goto error;
398 } else if (ret == 1) {
399 /*
400 * URI was the same in the consumer so we do not append the subdir
401 * again so to not duplicate output dir.
402 */
403 goto error;
404 }
405
406 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
407 ret = consumer_set_subdir(consumer, session_name);
408 if (ret < 0) {
409 ret = LTTNG_ERR_FATAL;
410 goto error;
411 }
412 }
413
414 if (uri->stype == LTTNG_STREAM_CONTROL) {
415 /* On a new subdir, reappend the default trace dir. */
416 strncat(consumer->subdir, default_trace_dir,
417 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
418 DBG3("Append domain trace name to subdir %s", consumer->subdir);
419 }
420
421 break;
422 case LTTNG_DST_PATH:
423 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
424 memset(consumer->dst.trace_path, 0,
425 sizeof(consumer->dst.trace_path));
426 strncpy(consumer->dst.trace_path, uri->dst.path,
427 sizeof(consumer->dst.trace_path));
428 /* Append default trace dir */
429 strncat(consumer->dst.trace_path, default_trace_dir,
430 sizeof(consumer->dst.trace_path) -
431 strlen(consumer->dst.trace_path) - 1);
432 /* Flag consumer as local. */
433 consumer->type = CONSUMER_DST_LOCAL;
434 break;
435 }
436
437 error:
438 return ret;
439 }
440
441 /*
442 * Init tracing by creating trace directory and sending fds kernel consumer.
443 */
444 static int init_kernel_tracing(struct ltt_kernel_session *session)
445 {
446 int ret = 0;
447 struct lttng_ht_iter iter;
448 struct consumer_socket *socket;
449
450 assert(session);
451
452 rcu_read_lock();
453
454 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
455 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
456 socket, node.node) {
457 /* Code flow error */
458 assert(socket->fd >= 0);
459
460 pthread_mutex_lock(socket->lock);
461 ret = kernel_consumer_send_session(socket, session);
462 pthread_mutex_unlock(socket->lock);
463 if (ret < 0) {
464 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
465 goto error;
466 }
467 }
468 }
469
470 error:
471 rcu_read_unlock();
472 return ret;
473 }
474
475 /*
476 * Create a socket to the relayd using the URI.
477 *
478 * On success, the relayd_sock pointer is set to the created socket.
479 * Else, it's stays untouched and a lttcomm error code is returned.
480 */
481 static int create_connect_relayd(struct lttng_uri *uri,
482 struct lttcomm_relayd_sock **relayd_sock)
483 {
484 int ret;
485 struct lttcomm_relayd_sock *rsock;
486
487 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
488 RELAYD_VERSION_COMM_MINOR);
489 if (!rsock) {
490 ret = LTTNG_ERR_FATAL;
491 goto error;
492 }
493
494 /*
495 * Connect to relayd so we can proceed with a session creation. This call
496 * can possibly block for an arbitrary amount of time to set the health
497 * state to be in poll execution.
498 */
499 health_poll_entry();
500 ret = relayd_connect(rsock);
501 health_poll_exit();
502 if (ret < 0) {
503 ERR("Unable to reach lttng-relayd");
504 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
505 goto free_sock;
506 }
507
508 /* Create socket for control stream. */
509 if (uri->stype == LTTNG_STREAM_CONTROL) {
510 DBG3("Creating relayd stream socket from URI");
511
512 /* Check relayd version */
513 ret = relayd_version_check(rsock);
514 if (ret < 0) {
515 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
516 goto close_sock;
517 }
518 } else if (uri->stype == LTTNG_STREAM_DATA) {
519 DBG3("Creating relayd data socket from URI");
520 } else {
521 /* Command is not valid */
522 ERR("Relayd invalid stream type: %d", uri->stype);
523 ret = LTTNG_ERR_INVALID;
524 goto close_sock;
525 }
526
527 *relayd_sock = rsock;
528
529 return LTTNG_OK;
530
531 close_sock:
532 /* The returned value is not useful since we are on an error path. */
533 (void) relayd_close(rsock);
534 free_sock:
535 free(rsock);
536 error:
537 return ret;
538 }
539
540 /*
541 * Connect to the relayd using URI and send the socket to the right consumer.
542 */
543 static int send_consumer_relayd_socket(int domain, struct ltt_session *session,
544 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
545 struct consumer_socket *consumer_sock)
546 {
547 int ret;
548 struct lttcomm_relayd_sock *rsock = NULL;
549
550 /* Connect to relayd and make version check if uri is the control. */
551 ret = create_connect_relayd(relayd_uri, &rsock);
552 if (ret != LTTNG_OK) {
553 goto error;
554 }
555 assert(rsock);
556
557 /* If the control socket is connected, network session is ready */
558 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
559 session->net_handle = 1;
560 }
561
562 /* Set the network sequence index if not set. */
563 if (consumer->net_seq_index == (uint64_t) -1ULL) {
564 pthread_mutex_lock(&relayd_net_seq_idx_lock);
565 /*
566 * Increment net_seq_idx because we are about to transfer the
567 * new relayd socket to the consumer.
568 * Assign unique key so the consumer can match streams.
569 */
570 consumer->net_seq_index = ++relayd_net_seq_idx;
571 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
572 }
573
574 /* Send relayd socket to consumer. */
575 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
576 relayd_uri->stype, session->id);
577 if (ret < 0) {
578 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
579 goto close_sock;
580 }
581
582 /* Flag that the corresponding socket was sent. */
583 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
584 consumer_sock->control_sock_sent = 1;
585 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
586 consumer_sock->data_sock_sent = 1;
587 }
588
589 ret = LTTNG_OK;
590
591 /*
592 * Close socket which was dup on the consumer side. The session daemon does
593 * NOT keep track of the relayd socket(s) once transfer to the consumer.
594 */
595
596 close_sock:
597 (void) relayd_close(rsock);
598 free(rsock);
599
600 error:
601 if (ret != LTTNG_OK) {
602 /*
603 * On error, nullify the consumer sequence index so streams are not
604 * associated with it once sent to the consumer.
605 */
606 uatomic_set(&consumer->net_seq_index, -1);
607 }
608 return ret;
609 }
610
611 /*
612 * Send both relayd sockets to a specific consumer and domain. This is a
613 * helper function to facilitate sending the information to the consumer for a
614 * session.
615 */
616 static int send_consumer_relayd_sockets(int domain,
617 struct ltt_session *session, struct consumer_output *consumer,
618 struct consumer_socket *sock)
619 {
620 int ret = LTTNG_OK;
621
622 assert(session);
623 assert(consumer);
624
625 /* Sending control relayd socket. */
626 if (!sock->control_sock_sent) {
627 ret = send_consumer_relayd_socket(domain, session,
628 &consumer->dst.net.control, consumer, sock);
629 if (ret != LTTNG_OK) {
630 goto error;
631 }
632 }
633
634 /* Sending data relayd socket. */
635 if (!sock->data_sock_sent) {
636 ret = send_consumer_relayd_socket(domain, session,
637 &consumer->dst.net.data, consumer, sock);
638 if (ret != LTTNG_OK) {
639 goto error;
640 }
641 }
642
643 error:
644 return ret;
645 }
646
647 /*
648 * Setup relayd connections for a tracing session. First creates the socket to
649 * the relayd and send them to the right domain consumer. Consumer type MUST be
650 * network.
651 */
652 int cmd_setup_relayd(struct ltt_session *session)
653 {
654 int ret = LTTNG_OK;
655 struct ltt_ust_session *usess;
656 struct ltt_kernel_session *ksess;
657 struct consumer_socket *socket;
658 struct lttng_ht_iter iter;
659
660 assert(session);
661
662 usess = session->ust_session;
663 ksess = session->kernel_session;
664
665 DBG("Setting relayd for session %s", session->name);
666
667 rcu_read_lock();
668
669 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
670 && usess->consumer->enabled) {
671 /* For each consumer socket, send relayd sockets */
672 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
673 socket, node.node) {
674 /* Code flow error */
675 assert(socket->fd >= 0);
676
677 pthread_mutex_lock(socket->lock);
678 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session,
679 usess->consumer, socket);
680 pthread_mutex_unlock(socket->lock);
681 if (ret != LTTNG_OK) {
682 goto error;
683 }
684 }
685 }
686
687 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
688 && ksess->consumer->enabled) {
689 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
690 socket, node.node) {
691 /* Code flow error */
692 assert(socket->fd >= 0);
693
694 pthread_mutex_lock(socket->lock);
695 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session,
696 ksess->consumer, socket);
697 pthread_mutex_unlock(socket->lock);
698 if (ret != LTTNG_OK) {
699 goto error;
700 }
701 }
702 }
703
704 error:
705 rcu_read_unlock();
706 return ret;
707 }
708
709 /*
710 * Start a kernel session by opening all necessary streams.
711 */
712 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
713 {
714 int ret;
715 struct ltt_kernel_channel *kchan;
716
717 /* Open kernel metadata */
718 if (ksess->metadata == NULL) {
719 ret = kernel_open_metadata(ksess);
720 if (ret < 0) {
721 ret = LTTNG_ERR_KERN_META_FAIL;
722 goto error;
723 }
724 }
725
726 /* Open kernel metadata stream */
727 if (ksess->metadata_stream_fd < 0) {
728 ret = kernel_open_metadata_stream(ksess);
729 if (ret < 0) {
730 ERR("Kernel create metadata stream failed");
731 ret = LTTNG_ERR_KERN_STREAM_FAIL;
732 goto error;
733 }
734 }
735
736 /* For each channel */
737 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
738 if (kchan->stream_count == 0) {
739 ret = kernel_open_channel_stream(kchan);
740 if (ret < 0) {
741 ret = LTTNG_ERR_KERN_STREAM_FAIL;
742 goto error;
743 }
744 /* Update the stream global counter */
745 ksess->stream_count_global += ret;
746 }
747 }
748
749 /* Setup kernel consumer socket and send fds to it */
750 ret = init_kernel_tracing(ksess);
751 if (ret < 0) {
752 ret = LTTNG_ERR_KERN_START_FAIL;
753 goto error;
754 }
755
756 /* This start the kernel tracing */
757 ret = kernel_start_session(ksess);
758 if (ret < 0) {
759 ret = LTTNG_ERR_KERN_START_FAIL;
760 goto error;
761 }
762
763 /* Quiescent wait after starting trace */
764 kernel_wait_quiescent(kernel_tracer_fd);
765
766 ksess->started = 1;
767
768 ret = LTTNG_OK;
769
770 error:
771 return ret;
772 }
773
774 /*
775 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
776 */
777 int cmd_disable_channel(struct ltt_session *session, int domain,
778 char *channel_name)
779 {
780 int ret;
781 struct ltt_ust_session *usess;
782
783 usess = session->ust_session;
784
785 rcu_read_lock();
786
787 switch (domain) {
788 case LTTNG_DOMAIN_KERNEL:
789 {
790 ret = channel_kernel_disable(session->kernel_session,
791 channel_name);
792 if (ret != LTTNG_OK) {
793 goto error;
794 }
795
796 kernel_wait_quiescent(kernel_tracer_fd);
797 break;
798 }
799 case LTTNG_DOMAIN_UST:
800 {
801 struct ltt_ust_channel *uchan;
802 struct lttng_ht *chan_ht;
803
804 chan_ht = usess->domain_global.channels;
805
806 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
807 if (uchan == NULL) {
808 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
809 goto error;
810 }
811
812 ret = channel_ust_disable(usess, uchan);
813 if (ret != LTTNG_OK) {
814 goto error;
815 }
816 break;
817 }
818 #if 0
819 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
820 case LTTNG_DOMAIN_UST_EXEC_NAME:
821 case LTTNG_DOMAIN_UST_PID:
822 #endif
823 default:
824 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
825 goto error;
826 }
827
828 ret = LTTNG_OK;
829
830 error:
831 rcu_read_unlock();
832 return ret;
833 }
834
835 /*
836 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
837 *
838 * The wpipe arguments is used as a notifier for the kernel thread.
839 */
840 int cmd_enable_channel(struct ltt_session *session,
841 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
842 {
843 int ret;
844 struct ltt_ust_session *usess = session->ust_session;
845 struct lttng_ht *chan_ht;
846
847 assert(session);
848 assert(attr);
849 assert(domain);
850
851 DBG("Enabling channel %s for session %s", attr->name, session->name);
852
853 rcu_read_lock();
854
855 switch (domain->type) {
856 case LTTNG_DOMAIN_KERNEL:
857 {
858 struct ltt_kernel_channel *kchan;
859
860 kchan = trace_kernel_get_channel_by_name(attr->name,
861 session->kernel_session);
862 if (kchan == NULL) {
863 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
864 } else {
865 ret = channel_kernel_enable(session->kernel_session, kchan);
866 }
867
868 if (ret != LTTNG_OK) {
869 goto error;
870 }
871
872 kernel_wait_quiescent(kernel_tracer_fd);
873
874 /*
875 * If the session was previously started, start as well this newly
876 * created kernel session so the events/channels enabled *after* the
877 * start actually work.
878 */
879 if (session->started && !session->kernel_session->started) {
880 ret = start_kernel_session(session->kernel_session, wpipe);
881 if (ret != LTTNG_OK) {
882 goto error;
883 }
884 }
885 break;
886 }
887 case LTTNG_DOMAIN_UST:
888 {
889 struct ltt_ust_channel *uchan;
890
891 chan_ht = usess->domain_global.channels;
892
893 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
894 if (uchan == NULL) {
895 ret = channel_ust_create(usess, attr, domain->buf_type);
896 } else {
897 ret = channel_ust_enable(usess, uchan);
898 }
899
900 /* Start the UST session if the session was already started. */
901 if (session->started && !usess->start_trace) {
902 ret = ust_app_start_trace_all(usess);
903 if (ret < 0) {
904 ret = LTTNG_ERR_UST_START_FAIL;
905 goto error;
906 }
907 ret = LTTNG_OK;
908 usess->start_trace = 1;
909 }
910 break;
911 }
912 default:
913 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
914 goto error;
915 }
916
917 error:
918 rcu_read_unlock();
919 return ret;
920 }
921
922
923 /*
924 * Command LTTNG_DISABLE_EVENT processed by the client thread.
925 */
926 int cmd_disable_event(struct ltt_session *session, int domain,
927 char *channel_name, char *event_name)
928 {
929 int ret;
930
931 rcu_read_lock();
932
933 switch (domain) {
934 case LTTNG_DOMAIN_KERNEL:
935 {
936 struct ltt_kernel_channel *kchan;
937 struct ltt_kernel_session *ksess;
938
939 ksess = session->kernel_session;
940
941 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
942 if (kchan == NULL) {
943 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
944 goto error;
945 }
946
947 ret = event_kernel_disable_tracepoint(kchan, event_name);
948 if (ret != LTTNG_OK) {
949 goto error;
950 }
951
952 kernel_wait_quiescent(kernel_tracer_fd);
953 break;
954 }
955 case LTTNG_DOMAIN_UST:
956 {
957 struct ltt_ust_channel *uchan;
958 struct ltt_ust_session *usess;
959
960 usess = session->ust_session;
961
962 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
963 channel_name);
964 if (uchan == NULL) {
965 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
966 goto error;
967 }
968
969 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
970 if (ret != LTTNG_OK) {
971 goto error;
972 }
973
974 DBG3("Disable UST event %s in channel %s completed", event_name,
975 channel_name);
976 break;
977 }
978 #if 0
979 case LTTNG_DOMAIN_UST_EXEC_NAME:
980 case LTTNG_DOMAIN_UST_PID:
981 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
982 #endif
983 default:
984 ret = LTTNG_ERR_UND;
985 goto error;
986 }
987
988 ret = LTTNG_OK;
989
990 error:
991 rcu_read_unlock();
992 return ret;
993 }
994
995 /*
996 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
997 */
998 int cmd_disable_event_all(struct ltt_session *session, int domain,
999 char *channel_name)
1000 {
1001 int ret;
1002
1003 rcu_read_lock();
1004
1005 switch (domain) {
1006 case LTTNG_DOMAIN_KERNEL:
1007 {
1008 struct ltt_kernel_session *ksess;
1009 struct ltt_kernel_channel *kchan;
1010
1011 ksess = session->kernel_session;
1012
1013 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1014 if (kchan == NULL) {
1015 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1016 goto error;
1017 }
1018
1019 ret = event_kernel_disable_all(kchan);
1020 if (ret != LTTNG_OK) {
1021 goto error;
1022 }
1023
1024 kernel_wait_quiescent(kernel_tracer_fd);
1025 break;
1026 }
1027 case LTTNG_DOMAIN_UST:
1028 {
1029 struct ltt_ust_session *usess;
1030 struct ltt_ust_channel *uchan;
1031
1032 usess = session->ust_session;
1033
1034 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1035 channel_name);
1036 if (uchan == NULL) {
1037 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1038 goto error;
1039 }
1040
1041 ret = event_ust_disable_all_tracepoints(usess, uchan);
1042 if (ret != 0) {
1043 goto error;
1044 }
1045
1046 DBG3("Disable all UST events in channel %s completed", channel_name);
1047
1048 break;
1049 }
1050 #if 0
1051 case LTTNG_DOMAIN_UST_EXEC_NAME:
1052 case LTTNG_DOMAIN_UST_PID:
1053 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1054 #endif
1055 default:
1056 ret = LTTNG_ERR_UND;
1057 goto error;
1058 }
1059
1060 ret = LTTNG_OK;
1061
1062 error:
1063 rcu_read_unlock();
1064 return ret;
1065 }
1066
1067 /*
1068 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1069 */
1070 int cmd_add_context(struct ltt_session *session, int domain,
1071 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1072 {
1073 int ret;
1074
1075 switch (domain) {
1076 case LTTNG_DOMAIN_KERNEL:
1077 assert(session->kernel_session);
1078
1079 if (session->kernel_session->channel_count == 0) {
1080 /* Create default channel */
1081 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1082 if (ret != LTTNG_OK) {
1083 goto error;
1084 }
1085 }
1086
1087 /* Add kernel context to kernel tracer */
1088 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1089 if (ret != LTTNG_OK) {
1090 goto error;
1091 }
1092 break;
1093 case LTTNG_DOMAIN_UST:
1094 {
1095 struct ltt_ust_session *usess = session->ust_session;
1096 assert(usess);
1097
1098 unsigned int chan_count =
1099 lttng_ht_get_count(usess->domain_global.channels);
1100 if (chan_count == 0) {
1101 struct lttng_channel *attr;
1102 /* Create default channel */
1103 attr = channel_new_default_attr(domain);
1104 if (attr == NULL) {
1105 ret = LTTNG_ERR_FATAL;
1106 goto error;
1107 }
1108
1109 ret = channel_ust_create(usess, attr, usess->buffer_type);
1110 if (ret != LTTNG_OK) {
1111 free(attr);
1112 goto error;
1113 }
1114 free(attr);
1115 }
1116
1117 ret = context_ust_add(usess, domain, ctx, channel_name);
1118 if (ret != LTTNG_OK) {
1119 goto error;
1120 }
1121 break;
1122 }
1123 #if 0
1124 case LTTNG_DOMAIN_UST_EXEC_NAME:
1125 case LTTNG_DOMAIN_UST_PID:
1126 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1127 #endif
1128 default:
1129 ret = LTTNG_ERR_UND;
1130 goto error;
1131 }
1132
1133 ret = LTTNG_OK;
1134
1135 error:
1136 return ret;
1137 }
1138
1139 /*
1140 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1141 */
1142 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1143 char *channel_name, struct lttng_event *event,
1144 struct lttng_filter_bytecode *filter, int wpipe)
1145 {
1146 int ret, channel_created = 0;
1147 struct lttng_channel *attr;
1148
1149 assert(session);
1150 assert(event);
1151 assert(channel_name);
1152
1153 rcu_read_lock();
1154
1155 switch (domain->type) {
1156 case LTTNG_DOMAIN_KERNEL:
1157 {
1158 struct ltt_kernel_channel *kchan;
1159
1160 kchan = trace_kernel_get_channel_by_name(channel_name,
1161 session->kernel_session);
1162 if (kchan == NULL) {
1163 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
1164 if (attr == NULL) {
1165 ret = LTTNG_ERR_FATAL;
1166 goto error;
1167 }
1168 strncpy(attr->name, channel_name, sizeof(attr->name));
1169
1170 ret = cmd_enable_channel(session, domain, attr, wpipe);
1171 if (ret != LTTNG_OK) {
1172 free(attr);
1173 goto error;
1174 }
1175 free(attr);
1176
1177 channel_created = 1;
1178 }
1179
1180 /* Get the newly created kernel channel pointer */
1181 kchan = trace_kernel_get_channel_by_name(channel_name,
1182 session->kernel_session);
1183 if (kchan == NULL) {
1184 /* This sould not happen... */
1185 ret = LTTNG_ERR_FATAL;
1186 goto error;
1187 }
1188
1189 ret = event_kernel_enable_tracepoint(kchan, event);
1190 if (ret != LTTNG_OK) {
1191 if (channel_created) {
1192 /* Let's not leak a useless channel. */
1193 kernel_destroy_channel(kchan);
1194 }
1195 goto error;
1196 }
1197
1198 kernel_wait_quiescent(kernel_tracer_fd);
1199 break;
1200 }
1201 case LTTNG_DOMAIN_UST:
1202 {
1203 struct ltt_ust_channel *uchan;
1204 struct ltt_ust_session *usess = session->ust_session;
1205
1206 assert(usess);
1207
1208 /* Get channel from global UST domain */
1209 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1210 channel_name);
1211 if (uchan == NULL) {
1212 /* Create default channel */
1213 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
1214 if (attr == NULL) {
1215 ret = LTTNG_ERR_FATAL;
1216 goto error;
1217 }
1218 strncpy(attr->name, channel_name, sizeof(attr->name));
1219
1220 ret = cmd_enable_channel(session, domain, attr, wpipe);
1221 if (ret != LTTNG_OK) {
1222 free(attr);
1223 goto error;
1224 }
1225 free(attr);
1226
1227 /* Get the newly created channel reference back */
1228 uchan = trace_ust_find_channel_by_name(
1229 usess->domain_global.channels, channel_name);
1230 assert(uchan);
1231 }
1232
1233 /* At this point, the session and channel exist on the tracer */
1234 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1235 if (ret != LTTNG_OK) {
1236 goto error;
1237 }
1238 break;
1239 }
1240 #if 0
1241 case LTTNG_DOMAIN_UST_EXEC_NAME:
1242 case LTTNG_DOMAIN_UST_PID:
1243 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1244 #endif
1245 default:
1246 ret = LTTNG_ERR_UND;
1247 goto error;
1248 }
1249
1250 ret = LTTNG_OK;
1251
1252 error:
1253 rcu_read_unlock();
1254 return ret;
1255 }
1256
1257 /*
1258 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1259 */
1260 int cmd_enable_event_all(struct ltt_session *session,
1261 struct lttng_domain *domain, char *channel_name, int event_type,
1262 struct lttng_filter_bytecode *filter, int wpipe)
1263 {
1264 int ret;
1265 struct lttng_channel *attr;
1266
1267 assert(session);
1268 assert(channel_name);
1269
1270 rcu_read_lock();
1271
1272 switch (domain->type) {
1273 case LTTNG_DOMAIN_KERNEL:
1274 {
1275 struct ltt_kernel_channel *kchan;
1276
1277 assert(session->kernel_session);
1278
1279 kchan = trace_kernel_get_channel_by_name(channel_name,
1280 session->kernel_session);
1281 if (kchan == NULL) {
1282 /* Create default channel */
1283 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
1284 if (attr == NULL) {
1285 ret = LTTNG_ERR_FATAL;
1286 goto error;
1287 }
1288 strncpy(attr->name, channel_name, sizeof(attr->name));
1289
1290 ret = cmd_enable_channel(session, domain, attr, wpipe);
1291 if (ret != LTTNG_OK) {
1292 free(attr);
1293 goto error;
1294 }
1295 free(attr);
1296
1297 /* Get the newly created kernel channel pointer */
1298 kchan = trace_kernel_get_channel_by_name(channel_name,
1299 session->kernel_session);
1300 assert(kchan);
1301 }
1302
1303 switch (event_type) {
1304 case LTTNG_EVENT_SYSCALL:
1305 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1306 break;
1307 case LTTNG_EVENT_TRACEPOINT:
1308 /*
1309 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1310 * events already registered to the channel.
1311 */
1312 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1313 break;
1314 case LTTNG_EVENT_ALL:
1315 /* Enable syscalls and tracepoints */
1316 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1317 break;
1318 default:
1319 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1320 goto error;
1321 }
1322
1323 /* Manage return value */
1324 if (ret != LTTNG_OK) {
1325 /*
1326 * On error, cmd_enable_channel call will take care of destroying
1327 * the created channel if it was needed.
1328 */
1329 goto error;
1330 }
1331
1332 kernel_wait_quiescent(kernel_tracer_fd);
1333 break;
1334 }
1335 case LTTNG_DOMAIN_UST:
1336 {
1337 struct ltt_ust_channel *uchan;
1338 struct ltt_ust_session *usess = session->ust_session;
1339
1340 assert(usess);
1341
1342 /* Get channel from global UST domain */
1343 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1344 channel_name);
1345 if (uchan == NULL) {
1346 /* Create default channel */
1347 attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
1348 if (attr == NULL) {
1349 ret = LTTNG_ERR_FATAL;
1350 goto error;
1351 }
1352 strncpy(attr->name, channel_name, sizeof(attr->name));
1353
1354 ret = cmd_enable_channel(session, domain, attr, wpipe);
1355 if (ret != LTTNG_OK) {
1356 free(attr);
1357 goto error;
1358 }
1359 free(attr);
1360
1361 /* Get the newly created channel reference back */
1362 uchan = trace_ust_find_channel_by_name(
1363 usess->domain_global.channels, channel_name);
1364 assert(uchan);
1365 }
1366
1367 /* At this point, the session and channel exist on the tracer */
1368
1369 switch (event_type) {
1370 case LTTNG_EVENT_ALL:
1371 case LTTNG_EVENT_TRACEPOINT:
1372 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1373 if (ret != LTTNG_OK) {
1374 goto error;
1375 }
1376 break;
1377 default:
1378 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1379 goto error;
1380 }
1381
1382 /* Manage return value */
1383 if (ret != LTTNG_OK) {
1384 goto error;
1385 }
1386
1387 break;
1388 }
1389 #if 0
1390 case LTTNG_DOMAIN_UST_EXEC_NAME:
1391 case LTTNG_DOMAIN_UST_PID:
1392 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1393 #endif
1394 default:
1395 ret = LTTNG_ERR_UND;
1396 goto error;
1397 }
1398
1399 ret = LTTNG_OK;
1400
1401 error:
1402 rcu_read_unlock();
1403 return ret;
1404 }
1405
1406
1407 /*
1408 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1409 */
1410 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1411 {
1412 int ret;
1413 ssize_t nb_events = 0;
1414
1415 switch (domain) {
1416 case LTTNG_DOMAIN_KERNEL:
1417 nb_events = kernel_list_events(kernel_tracer_fd, events);
1418 if (nb_events < 0) {
1419 ret = LTTNG_ERR_KERN_LIST_FAIL;
1420 goto error;
1421 }
1422 break;
1423 case LTTNG_DOMAIN_UST:
1424 nb_events = ust_app_list_events(events);
1425 if (nb_events < 0) {
1426 ret = LTTNG_ERR_UST_LIST_FAIL;
1427 goto error;
1428 }
1429 break;
1430 default:
1431 ret = LTTNG_ERR_UND;
1432 goto error;
1433 }
1434
1435 return nb_events;
1436
1437 error:
1438 /* Return negative value to differentiate return code */
1439 return -ret;
1440 }
1441
1442 /*
1443 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1444 */
1445 ssize_t cmd_list_tracepoint_fields(int domain,
1446 struct lttng_event_field **fields)
1447 {
1448 int ret;
1449 ssize_t nb_fields = 0;
1450
1451 switch (domain) {
1452 case LTTNG_DOMAIN_UST:
1453 nb_fields = ust_app_list_event_fields(fields);
1454 if (nb_fields < 0) {
1455 ret = LTTNG_ERR_UST_LIST_FAIL;
1456 goto error;
1457 }
1458 break;
1459 case LTTNG_DOMAIN_KERNEL:
1460 default: /* fall-through */
1461 ret = LTTNG_ERR_UND;
1462 goto error;
1463 }
1464
1465 return nb_fields;
1466
1467 error:
1468 /* Return negative value to differentiate return code */
1469 return -ret;
1470 }
1471
1472 /*
1473 * Command LTTNG_START_TRACE processed by the client thread.
1474 */
1475 int cmd_start_trace(struct ltt_session *session)
1476 {
1477 int ret;
1478 struct ltt_kernel_session *ksession;
1479 struct ltt_ust_session *usess;
1480
1481 assert(session);
1482
1483 /* Ease our life a bit ;) */
1484 ksession = session->kernel_session;
1485 usess = session->ust_session;
1486
1487 if (session->enabled) {
1488 /* Already started. */
1489 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1490 goto error;
1491 }
1492
1493 session->enabled = 1;
1494
1495 /* Kernel tracing */
1496 if (ksession != NULL) {
1497 ret = start_kernel_session(ksession, kernel_tracer_fd);
1498 if (ret != LTTNG_OK) {
1499 goto error;
1500 }
1501 }
1502
1503 /* Flag session that trace should start automatically */
1504 if (usess) {
1505 usess->start_trace = 1;
1506
1507 ret = ust_app_start_trace_all(usess);
1508 if (ret < 0) {
1509 ret = LTTNG_ERR_UST_START_FAIL;
1510 goto error;
1511 }
1512 }
1513
1514 session->started = 1;
1515
1516 ret = LTTNG_OK;
1517
1518 error:
1519 return ret;
1520 }
1521
1522 /*
1523 * Command LTTNG_STOP_TRACE processed by the client thread.
1524 */
1525 int cmd_stop_trace(struct ltt_session *session)
1526 {
1527 int ret;
1528 struct ltt_kernel_channel *kchan;
1529 struct ltt_kernel_session *ksession;
1530 struct ltt_ust_session *usess;
1531
1532 assert(session);
1533
1534 /* Short cut */
1535 ksession = session->kernel_session;
1536 usess = session->ust_session;
1537
1538 if (!session->enabled) {
1539 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1540 goto error;
1541 }
1542
1543 session->enabled = 0;
1544
1545 /* Kernel tracer */
1546 if (ksession) {
1547 DBG("Stop kernel tracing");
1548
1549 /* Flush metadata if exist */
1550 if (ksession->metadata_stream_fd >= 0) {
1551 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1552 if (ret < 0) {
1553 ERR("Kernel metadata flush failed");
1554 }
1555 }
1556
1557 /* Flush all buffers before stopping */
1558 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1559 ret = kernel_flush_buffer(kchan);
1560 if (ret < 0) {
1561 ERR("Kernel flush buffer error");
1562 }
1563 }
1564
1565 ret = kernel_stop_session(ksession);
1566 if (ret < 0) {
1567 ret = LTTNG_ERR_KERN_STOP_FAIL;
1568 goto error;
1569 }
1570
1571 kernel_wait_quiescent(kernel_tracer_fd);
1572
1573 ksession->started = 0;
1574 }
1575
1576 if (usess) {
1577 usess->start_trace = 0;
1578
1579 ret = ust_app_stop_trace_all(usess);
1580 if (ret < 0) {
1581 ret = LTTNG_ERR_UST_STOP_FAIL;
1582 goto error;
1583 }
1584 }
1585
1586 session->started = 0;
1587
1588 ret = LTTNG_OK;
1589
1590 error:
1591 return ret;
1592 }
1593
1594 /*
1595 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1596 */
1597 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1598 size_t nb_uri, struct lttng_uri *uris)
1599 {
1600 int ret, i;
1601 struct ltt_kernel_session *ksess = session->kernel_session;
1602 struct ltt_ust_session *usess = session->ust_session;
1603 struct consumer_output *consumer = NULL;
1604
1605 assert(session);
1606 assert(uris);
1607 assert(nb_uri > 0);
1608
1609 /* Can't enable consumer after session started. */
1610 if (session->enabled) {
1611 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1612 goto error;
1613 }
1614
1615 /*
1616 * This case switch makes sure the domain session has a temporary consumer
1617 * so the URL can be set.
1618 */
1619 switch (domain) {
1620 case 0:
1621 /* Code flow error. A session MUST always have a consumer object */
1622 assert(session->consumer);
1623 /*
1624 * The URL will be added to the tracing session consumer instead of a
1625 * specific domain consumer.
1626 */
1627 consumer = session->consumer;
1628 break;
1629 case LTTNG_DOMAIN_KERNEL:
1630 /* Code flow error if we don't have a kernel session here. */
1631 assert(ksess);
1632 assert(ksess->consumer);
1633 consumer = ksess->consumer;
1634 break;
1635 case LTTNG_DOMAIN_UST:
1636 /* Code flow error if we don't have a kernel session here. */
1637 assert(usess);
1638 assert(usess->consumer);
1639 consumer = usess->consumer;
1640 break;
1641 }
1642
1643 for (i = 0; i < nb_uri; i++) {
1644 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1645 if (ret < 0) {
1646 goto error;
1647 }
1648 }
1649
1650 /* All good! */
1651 ret = LTTNG_OK;
1652
1653 error:
1654 return ret;
1655 }
1656
1657 /*
1658 * Command LTTNG_CREATE_SESSION processed by the client thread.
1659 */
1660 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1661 size_t nb_uri, lttng_sock_cred *creds)
1662 {
1663 int ret;
1664 char *path = NULL;
1665 struct ltt_session *session;
1666
1667 assert(name);
1668
1669 /* No URIs is not possible. */
1670 if (uris == NULL) {
1671 ret = LTTNG_ERR_SESSION_FAIL;
1672 goto session_error;
1673 }
1674
1675 /*
1676 * Verify if the session already exist
1677 *
1678 * XXX: There is no need for the session lock list here since the caller
1679 * (process_client_msg) is holding it. We might want to change that so a
1680 * single command does not lock the entire session list.
1681 */
1682 session = session_find_by_name(name);
1683 if (session != NULL) {
1684 ret = LTTNG_ERR_EXIST_SESS;
1685 goto find_error;
1686 }
1687
1688 /* Create tracing session in the registry */
1689 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
1690 LTTNG_SOCK_GET_GID_CRED(creds));
1691 if (ret != LTTNG_OK) {
1692 goto session_error;
1693 }
1694
1695 /*
1696 * Get the newly created session pointer back
1697 *
1698 * XXX: There is no need for the session lock list here since the caller
1699 * (process_client_msg) is holding it. We might want to change that so a
1700 * single command does not lock the entire session list.
1701 */
1702 session = session_find_by_name(name);
1703 assert(session);
1704
1705 /* Create default consumer output for the session not yet created. */
1706 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1707 if (session->consumer == NULL) {
1708 ret = LTTNG_ERR_FATAL;
1709 goto consumer_error;
1710 }
1711
1712 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1713 if (ret != LTTNG_OK) {
1714 goto consumer_error;
1715 }
1716
1717 session->consumer->enabled = 1;
1718
1719 return LTTNG_OK;
1720
1721 consumer_error:
1722 session_destroy(session);
1723 session_error:
1724 find_error:
1725 return ret;
1726 }
1727
1728 /*
1729 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1730 */
1731 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1732 {
1733 int ret;
1734 struct ltt_ust_session *usess;
1735 struct ltt_kernel_session *ksess;
1736
1737 /* Safety net */
1738 assert(session);
1739
1740 usess = session->ust_session;
1741 ksess = session->kernel_session;
1742
1743 /* Clean kernel session teardown */
1744 kernel_destroy_session(ksess);
1745
1746 /* UST session teardown */
1747 if (usess) {
1748 /* Close any relayd session */
1749 consumer_output_send_destroy_relayd(usess->consumer);
1750
1751 /* Destroy every UST application related to this session. */
1752 ret = ust_app_destroy_trace_all(usess);
1753 if (ret) {
1754 ERR("Error in ust_app_destroy_trace_all");
1755 }
1756
1757 /* Clean up the rest. */
1758 trace_ust_destroy_session(usess);
1759 }
1760
1761 /*
1762 * Must notify the kernel thread here to update it's poll set in order to
1763 * remove the channel(s)' fd just destroyed.
1764 */
1765 ret = notify_thread_pipe(wpipe);
1766 if (ret < 0) {
1767 PERROR("write kernel poll pipe");
1768 }
1769
1770 ret = session_destroy(session);
1771
1772 return ret;
1773 }
1774
1775 /*
1776 * Command LTTNG_CALIBRATE processed by the client thread.
1777 */
1778 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1779 {
1780 int ret;
1781
1782 switch (domain) {
1783 case LTTNG_DOMAIN_KERNEL:
1784 {
1785 struct lttng_kernel_calibrate kcalibrate;
1786
1787 kcalibrate.type = calibrate->type;
1788 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1789 if (ret < 0) {
1790 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1791 goto error;
1792 }
1793 break;
1794 }
1795 case LTTNG_DOMAIN_UST:
1796 {
1797 struct lttng_ust_calibrate ucalibrate;
1798
1799 ucalibrate.type = calibrate->type;
1800 ret = ust_app_calibrate_glb(&ucalibrate);
1801 if (ret < 0) {
1802 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
1803 goto error;
1804 }
1805 break;
1806 }
1807 default:
1808 ret = LTTNG_ERR_UND;
1809 goto error;
1810 }
1811
1812 ret = LTTNG_OK;
1813
1814 error:
1815 return ret;
1816 }
1817
1818 /*
1819 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
1820 */
1821 int cmd_register_consumer(struct ltt_session *session, int domain,
1822 const char *sock_path, struct consumer_data *cdata)
1823 {
1824 int ret, sock;
1825 struct consumer_socket *socket;
1826
1827 assert(session);
1828 assert(cdata);
1829 assert(sock_path);
1830
1831 switch (domain) {
1832 case LTTNG_DOMAIN_KERNEL:
1833 {
1834 struct ltt_kernel_session *ksess = session->kernel_session;
1835
1836 assert(ksess);
1837
1838 /* Can't register a consumer if there is already one */
1839 if (ksess->consumer_fds_sent != 0) {
1840 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
1841 goto error;
1842 }
1843
1844 sock = lttcomm_connect_unix_sock(sock_path);
1845 if (sock < 0) {
1846 ret = LTTNG_ERR_CONNECT_FAIL;
1847 goto error;
1848 }
1849
1850 socket = consumer_allocate_socket(sock);
1851 if (socket == NULL) {
1852 ret = close(sock);
1853 if (ret < 0) {
1854 PERROR("close register consumer");
1855 }
1856 ret = LTTNG_ERR_FATAL;
1857 goto error;
1858 }
1859
1860 socket->lock = zmalloc(sizeof(pthread_mutex_t));
1861 if (socket->lock == NULL) {
1862 PERROR("zmalloc pthread mutex");
1863 ret = LTTNG_ERR_FATAL;
1864 goto error;
1865 }
1866 pthread_mutex_init(socket->lock, NULL);
1867 socket->registered = 1;
1868
1869 rcu_read_lock();
1870 consumer_add_socket(socket, ksess->consumer);
1871 rcu_read_unlock();
1872
1873 pthread_mutex_lock(&cdata->pid_mutex);
1874 cdata->pid = -1;
1875 pthread_mutex_unlock(&cdata->pid_mutex);
1876
1877 break;
1878 }
1879 default:
1880 /* TODO: Userspace tracing */
1881 ret = LTTNG_ERR_UND;
1882 goto error;
1883 }
1884
1885 ret = LTTNG_OK;
1886
1887 error:
1888 return ret;
1889 }
1890
1891 /*
1892 * Command LTTNG_LIST_DOMAINS processed by the client thread.
1893 */
1894 ssize_t cmd_list_domains(struct ltt_session *session,
1895 struct lttng_domain **domains)
1896 {
1897 int ret, index = 0;
1898 ssize_t nb_dom = 0;
1899
1900 if (session->kernel_session != NULL) {
1901 DBG3("Listing domains found kernel domain");
1902 nb_dom++;
1903 }
1904
1905 if (session->ust_session != NULL) {
1906 DBG3("Listing domains found UST global domain");
1907 nb_dom++;
1908 }
1909
1910 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
1911 if (*domains == NULL) {
1912 ret = LTTNG_ERR_FATAL;
1913 goto error;
1914 }
1915
1916 if (session->kernel_session != NULL) {
1917 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
1918 index++;
1919 }
1920
1921 if (session->ust_session != NULL) {
1922 (*domains)[index].type = LTTNG_DOMAIN_UST;
1923 index++;
1924 }
1925
1926 return nb_dom;
1927
1928 error:
1929 /* Return negative value to differentiate return code */
1930 return -ret;
1931 }
1932
1933
1934 /*
1935 * Command LTTNG_LIST_CHANNELS processed by the client thread.
1936 */
1937 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
1938 struct lttng_channel **channels)
1939 {
1940 int ret;
1941 ssize_t nb_chan = 0;
1942
1943 switch (domain) {
1944 case LTTNG_DOMAIN_KERNEL:
1945 if (session->kernel_session != NULL) {
1946 nb_chan = session->kernel_session->channel_count;
1947 }
1948 DBG3("Number of kernel channels %zd", nb_chan);
1949 if (nb_chan <= 0) {
1950 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1951 }
1952 break;
1953 case LTTNG_DOMAIN_UST:
1954 if (session->ust_session != NULL) {
1955 nb_chan = lttng_ht_get_count(
1956 session->ust_session->domain_global.channels);
1957 }
1958 DBG3("Number of UST global channels %zd", nb_chan);
1959 if (nb_chan <= 0) {
1960 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1961 }
1962 break;
1963 default:
1964 *channels = NULL;
1965 ret = LTTNG_ERR_UND;
1966 goto error;
1967 }
1968
1969 if (nb_chan > 0) {
1970 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
1971 if (*channels == NULL) {
1972 ret = LTTNG_ERR_FATAL;
1973 goto error;
1974 }
1975
1976 list_lttng_channels(domain, session, *channels);
1977 } else {
1978 *channels = NULL;
1979 /* Ret value was set in the domain switch case */
1980 goto error;
1981 }
1982
1983 return nb_chan;
1984
1985 error:
1986 /* Return negative value to differentiate return code */
1987 return -ret;
1988 }
1989
1990 /*
1991 * Command LTTNG_LIST_EVENTS processed by the client thread.
1992 */
1993 ssize_t cmd_list_events(int domain, struct ltt_session *session,
1994 char *channel_name, struct lttng_event **events)
1995 {
1996 int ret = 0;
1997 ssize_t nb_event = 0;
1998
1999 switch (domain) {
2000 case LTTNG_DOMAIN_KERNEL:
2001 if (session->kernel_session != NULL) {
2002 nb_event = list_lttng_kernel_events(channel_name,
2003 session->kernel_session, events);
2004 }
2005 break;
2006 case LTTNG_DOMAIN_UST:
2007 {
2008 if (session->ust_session != NULL) {
2009 nb_event = list_lttng_ust_global_events(channel_name,
2010 &session->ust_session->domain_global, events);
2011 }
2012 break;
2013 }
2014 default:
2015 ret = LTTNG_ERR_UND;
2016 goto error;
2017 }
2018
2019 return nb_event;
2020
2021 error:
2022 /* Return negative value to differentiate return code */
2023 return -ret;
2024 }
2025
2026 /*
2027 * Using the session list, filled a lttng_session array to send back to the
2028 * client for session listing.
2029 *
2030 * The session list lock MUST be acquired before calling this function. Use
2031 * session_lock_list() and session_unlock_list().
2032 */
2033 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2034 gid_t gid)
2035 {
2036 int ret;
2037 unsigned int i = 0;
2038 struct ltt_session *session;
2039 struct ltt_session_list *list = session_get_list();
2040
2041 DBG("Getting all available session for UID %d GID %d",
2042 uid, gid);
2043 /*
2044 * Iterate over session list and append data after the control struct in
2045 * the buffer.
2046 */
2047 cds_list_for_each_entry(session, &list->head, list) {
2048 /*
2049 * Only list the sessions the user can control.
2050 */
2051 if (!session_access_ok(session, uid, gid)) {
2052 continue;
2053 }
2054
2055 struct ltt_kernel_session *ksess = session->kernel_session;
2056 struct ltt_ust_session *usess = session->ust_session;
2057
2058 if (session->consumer->type == CONSUMER_DST_NET ||
2059 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2060 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2061 ret = build_network_session_path(sessions[i].path,
2062 sizeof(session[i].path), session);
2063 } else {
2064 ret = snprintf(sessions[i].path, sizeof(session[i].path), "%s",
2065 session->consumer->dst.trace_path);
2066 }
2067 if (ret < 0) {
2068 PERROR("snprintf session path");
2069 continue;
2070 }
2071
2072 strncpy(sessions[i].name, session->name, NAME_MAX);
2073 sessions[i].name[NAME_MAX - 1] = '\0';
2074 sessions[i].enabled = session->enabled;
2075 i++;
2076 }
2077 }
2078
2079 /*
2080 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2081 * ready for trace analysis (or anykind of reader) or else 1 for pending data.
2082 */
2083 int cmd_data_pending(struct ltt_session *session)
2084 {
2085 int ret;
2086 struct ltt_kernel_session *ksess = session->kernel_session;
2087 struct ltt_ust_session *usess = session->ust_session;
2088
2089 assert(session);
2090
2091 /* Session MUST be stopped to ask for data availability. */
2092 if (session->enabled) {
2093 ret = LTTNG_ERR_SESSION_STARTED;
2094 goto error;
2095 }
2096
2097 if (ksess && ksess->consumer) {
2098 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2099 if (ret == 1) {
2100 /* Data is still being extracted for the kernel. */
2101 goto error;
2102 }
2103 }
2104
2105 if (usess && usess->consumer) {
2106 ret = consumer_is_data_pending(usess->id, usess->consumer);
2107 if (ret == 1) {
2108 /* Data is still being extracted for the kernel. */
2109 goto error;
2110 }
2111 }
2112
2113 /* Data is ready to be read by a viewer */
2114 ret = 0;
2115
2116 error:
2117 return ret;
2118 }
2119
2120 /*
2121 * Init command subsystem.
2122 */
2123 void cmd_init(void)
2124 {
2125 /*
2126 * Set network sequence index to 1 for streams to match a relayd
2127 * socket on the consumer side.
2128 */
2129 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2130 relayd_net_seq_idx = 1;
2131 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2132
2133 DBG("Command subsystem initialized");
2134 }
LTTng 2.0 tools and control repository
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