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Fix: don't ask data pending if session was not started
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <assert.h>
20 #include <inttypes.h>
21 #include <urcu/list.h>
22 #include <urcu/uatomic.h>
23
24 #include <common/defaults.h>
25 #include <common/common.h>
26 #include <common/sessiond-comm/sessiond-comm.h>
27 #include <common/relayd/relayd.h>
28 #include <common/utils.h>
29
30 #include "channel.h"
31 #include "consumer.h"
32 #include "event.h"
33 #include "health.h"
34 #include "kernel.h"
35 #include "kernel-consumer.h"
36 #include "lttng-sessiond.h"
37 #include "utils.h"
38
39 #include "cmd.h"
40
41 /*
42 * Used to keep a unique index for each relayd socket created where this value
43 * is associated with streams on the consumer so it can match the right relayd
44 * to send to. It must be accessed with the relayd_net_seq_idx_lock
45 * held.
46 */
47 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
48 static uint64_t relayd_net_seq_idx;
49
50 /*
51 * Create a session path used by list_lttng_sessions for the case that the
52 * session consumer is on the network.
53 */
54 static int build_network_session_path(char *dst, size_t size,
55 struct ltt_session *session)
56 {
57 int ret, kdata_port, udata_port;
58 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
59 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
60
61 assert(session);
62 assert(dst);
63
64 memset(tmp_urls, 0, sizeof(tmp_urls));
65 memset(tmp_uurl, 0, sizeof(tmp_uurl));
66
67 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
68
69 if (session->kernel_session && session->kernel_session->consumer) {
70 kuri = &session->kernel_session->consumer->dst.net.control;
71 kdata_port = session->kernel_session->consumer->dst.net.data.port;
72 }
73
74 if (session->ust_session && session->ust_session->consumer) {
75 uuri = &session->ust_session->consumer->dst.net.control;
76 udata_port = session->ust_session->consumer->dst.net.data.port;
77 }
78
79 if (uuri == NULL && kuri == NULL) {
80 uri = &session->consumer->dst.net.control;
81 kdata_port = session->consumer->dst.net.data.port;
82 } else if (kuri && uuri) {
83 ret = uri_compare(kuri, uuri);
84 if (ret) {
85 /* Not Equal */
86 uri = kuri;
87 /* Build uuri URL string */
88 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
89 if (ret < 0) {
90 goto error;
91 }
92 } else {
93 uri = kuri;
94 }
95 } else if (kuri && uuri == NULL) {
96 uri = kuri;
97 } else if (uuri && kuri == NULL) {
98 uri = uuri;
99 }
100
101 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
102 if (ret < 0) {
103 goto error;
104 }
105
106 /*
107 * Do we have a UST url set. If yes, this means we have both kernel and UST
108 * to print.
109 */
110 if (*tmp_uurl != '\0') {
111 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
112 tmp_urls, kdata_port, tmp_uurl, udata_port);
113 } else {
114 int dport;
115 if (kuri || (!kuri && !uuri)) {
116 dport = kdata_port;
117 } else {
118 /* No kernel URI, use the UST port. */
119 dport = udata_port;
120 }
121 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
122 }
123
124 error:
125 return ret;
126 }
127
128 /*
129 * Fill lttng_channel array of all channels.
130 */
131 static void list_lttng_channels(int domain, struct ltt_session *session,
132 struct lttng_channel *channels)
133 {
134 int i = 0;
135 struct ltt_kernel_channel *kchan;
136
137 DBG("Listing channels for session %s", session->name);
138
139 switch (domain) {
140 case LTTNG_DOMAIN_KERNEL:
141 /* Kernel channels */
142 if (session->kernel_session != NULL) {
143 cds_list_for_each_entry(kchan,
144 &session->kernel_session->channel_list.head, list) {
145 /* Copy lttng_channel struct to array */
146 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
147 channels[i].enabled = kchan->enabled;
148 i++;
149 }
150 }
151 break;
152 case LTTNG_DOMAIN_UST:
153 {
154 struct lttng_ht_iter iter;
155 struct ltt_ust_channel *uchan;
156
157 rcu_read_lock();
158 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
159 &iter.iter, uchan, node.node) {
160 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
161 channels[i].attr.overwrite = uchan->attr.overwrite;
162 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
163 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
164 channels[i].attr.switch_timer_interval =
165 uchan->attr.switch_timer_interval;
166 channels[i].attr.read_timer_interval =
167 uchan->attr.read_timer_interval;
168 channels[i].enabled = uchan->enabled;
169 switch (uchan->attr.output) {
170 case LTTNG_UST_MMAP:
171 default:
172 channels[i].attr.output = LTTNG_EVENT_MMAP;
173 break;
174 }
175 i++;
176 }
177 rcu_read_unlock();
178 break;
179 }
180 default:
181 break;
182 }
183 }
184
185 /*
186 * Create a list of ust global domain events.
187 */
188 static int list_lttng_ust_global_events(char *channel_name,
189 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
190 {
191 int i = 0, ret = 0;
192 unsigned int nb_event = 0;
193 struct lttng_ht_iter iter;
194 struct lttng_ht_node_str *node;
195 struct ltt_ust_channel *uchan;
196 struct ltt_ust_event *uevent;
197 struct lttng_event *tmp;
198
199 DBG("Listing UST global events for channel %s", channel_name);
200
201 rcu_read_lock();
202
203 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
204 node = lttng_ht_iter_get_node_str(&iter);
205 if (node == NULL) {
206 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
207 goto error;
208 }
209
210 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
211
212 nb_event += lttng_ht_get_count(uchan->events);
213
214 if (nb_event == 0) {
215 ret = nb_event;
216 goto error;
217 }
218
219 DBG3("Listing UST global %d events", nb_event);
220
221 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
222 if (tmp == NULL) {
223 ret = LTTNG_ERR_FATAL;
224 goto error;
225 }
226
227 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
228 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
229 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
230 tmp[i].enabled = uevent->enabled;
231
232 switch (uevent->attr.instrumentation) {
233 case LTTNG_UST_TRACEPOINT:
234 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
235 break;
236 case LTTNG_UST_PROBE:
237 tmp[i].type = LTTNG_EVENT_PROBE;
238 break;
239 case LTTNG_UST_FUNCTION:
240 tmp[i].type = LTTNG_EVENT_FUNCTION;
241 break;
242 }
243
244 tmp[i].loglevel = uevent->attr.loglevel;
245 switch (uevent->attr.loglevel_type) {
246 case LTTNG_UST_LOGLEVEL_ALL:
247 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
248 break;
249 case LTTNG_UST_LOGLEVEL_RANGE:
250 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
251 break;
252 case LTTNG_UST_LOGLEVEL_SINGLE:
253 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
254 break;
255 }
256 if (uevent->filter) {
257 tmp[i].filter = 1;
258 }
259 i++;
260 }
261
262 ret = nb_event;
263 *events = tmp;
264
265 error:
266 rcu_read_unlock();
267 return ret;
268 }
269
270 /*
271 * Fill lttng_event array of all kernel events in the channel.
272 */
273 static int list_lttng_kernel_events(char *channel_name,
274 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
275 {
276 int i = 0, ret;
277 unsigned int nb_event;
278 struct ltt_kernel_event *event;
279 struct ltt_kernel_channel *kchan;
280
281 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
282 if (kchan == NULL) {
283 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
284 goto error;
285 }
286
287 nb_event = kchan->event_count;
288
289 DBG("Listing events for channel %s", kchan->channel->name);
290
291 if (nb_event == 0) {
292 goto end;
293 }
294
295 *events = zmalloc(nb_event * sizeof(struct lttng_event));
296 if (*events == NULL) {
297 ret = LTTNG_ERR_FATAL;
298 goto error;
299 }
300
301 /* Kernel channels */
302 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
303 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
304 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
305 (*events)[i].enabled = event->enabled;
306
307 switch (event->event->instrumentation) {
308 case LTTNG_KERNEL_TRACEPOINT:
309 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
310 break;
311 case LTTNG_KERNEL_KRETPROBE:
312 (*events)[i].type = LTTNG_EVENT_FUNCTION;
313 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
314 sizeof(struct lttng_kernel_kprobe));
315 break;
316 case LTTNG_KERNEL_KPROBE:
317 (*events)[i].type = LTTNG_EVENT_PROBE;
318 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
319 sizeof(struct lttng_kernel_kprobe));
320 break;
321 case LTTNG_KERNEL_FUNCTION:
322 (*events)[i].type = LTTNG_EVENT_FUNCTION;
323 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
324 sizeof(struct lttng_kernel_function));
325 break;
326 case LTTNG_KERNEL_NOOP:
327 (*events)[i].type = LTTNG_EVENT_NOOP;
328 break;
329 case LTTNG_KERNEL_SYSCALL:
330 (*events)[i].type = LTTNG_EVENT_SYSCALL;
331 break;
332 case LTTNG_KERNEL_ALL:
333 assert(0);
334 break;
335 }
336 i++;
337 }
338
339 end:
340 return nb_event;
341
342 error:
343 /* Negate the error code to differentiate the size from an error */
344 return -ret;
345 }
346
347 /*
348 * Add URI so the consumer output object. Set the correct path depending on the
349 * domain adding the default trace directory.
350 */
351 static int add_uri_to_consumer(struct consumer_output *consumer,
352 struct lttng_uri *uri, int domain, const char *session_name)
353 {
354 int ret = LTTNG_OK;
355 const char *default_trace_dir;
356
357 assert(uri);
358
359 if (consumer == NULL) {
360 DBG("No consumer detected. Don't add URI. Stopping.");
361 ret = LTTNG_ERR_NO_CONSUMER;
362 goto error;
363 }
364
365 switch (domain) {
366 case LTTNG_DOMAIN_KERNEL:
367 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
368 break;
369 case LTTNG_DOMAIN_UST:
370 default_trace_dir = DEFAULT_UST_TRACE_DIR;
371 break;
372 default:
373 /*
374 * This case is possible is we try to add the URI to the global tracing
375 * session consumer object which in this case there is no subdir.
376 */
377 default_trace_dir = "";
378 }
379
380 switch (uri->dtype) {
381 case LTTNG_DST_IPV4:
382 case LTTNG_DST_IPV6:
383 DBG2("Setting network URI to consumer");
384
385 if (consumer->type == CONSUMER_DST_NET) {
386 if ((uri->stype == LTTNG_STREAM_CONTROL &&
387 consumer->dst.net.control_isset) ||
388 (uri->stype == LTTNG_STREAM_DATA &&
389 consumer->dst.net.data_isset)) {
390 ret = LTTNG_ERR_URL_EXIST;
391 goto error;
392 }
393 } else {
394 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
395 }
396
397 consumer->type = CONSUMER_DST_NET;
398
399 /* Set URI into consumer output object */
400 ret = consumer_set_network_uri(consumer, uri);
401 if (ret < 0) {
402 ret = -ret;
403 goto error;
404 } else if (ret == 1) {
405 /*
406 * URI was the same in the consumer so we do not append the subdir
407 * again so to not duplicate output dir.
408 */
409 goto error;
410 }
411
412 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
413 ret = consumer_set_subdir(consumer, session_name);
414 if (ret < 0) {
415 ret = LTTNG_ERR_FATAL;
416 goto error;
417 }
418 }
419
420 if (uri->stype == LTTNG_STREAM_CONTROL) {
421 /* On a new subdir, reappend the default trace dir. */
422 strncat(consumer->subdir, default_trace_dir,
423 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
424 DBG3("Append domain trace name to subdir %s", consumer->subdir);
425 }
426
427 break;
428 case LTTNG_DST_PATH:
429 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
430 memset(consumer->dst.trace_path, 0,
431 sizeof(consumer->dst.trace_path));
432 strncpy(consumer->dst.trace_path, uri->dst.path,
433 sizeof(consumer->dst.trace_path));
434 /* Append default trace dir */
435 strncat(consumer->dst.trace_path, default_trace_dir,
436 sizeof(consumer->dst.trace_path) -
437 strlen(consumer->dst.trace_path) - 1);
438 /* Flag consumer as local. */
439 consumer->type = CONSUMER_DST_LOCAL;
440 break;
441 }
442
443 ret = LTTNG_OK;
444
445 error:
446 return ret;
447 }
448
449 /*
450 * Init tracing by creating trace directory and sending fds kernel consumer.
451 */
452 static int init_kernel_tracing(struct ltt_kernel_session *session)
453 {
454 int ret = 0;
455 struct lttng_ht_iter iter;
456 struct consumer_socket *socket;
457
458 assert(session);
459
460 rcu_read_lock();
461
462 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
463 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
464 socket, node.node) {
465 pthread_mutex_lock(socket->lock);
466 ret = kernel_consumer_send_session(socket, session);
467 pthread_mutex_unlock(socket->lock);
468 if (ret < 0) {
469 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
470 goto error;
471 }
472 }
473 }
474
475 error:
476 rcu_read_unlock();
477 return ret;
478 }
479
480 /*
481 * Create a socket to the relayd using the URI.
482 *
483 * On success, the relayd_sock pointer is set to the created socket.
484 * Else, it's stays untouched and a lttcomm error code is returned.
485 */
486 static int create_connect_relayd(struct lttng_uri *uri,
487 struct lttcomm_relayd_sock **relayd_sock)
488 {
489 int ret;
490 struct lttcomm_relayd_sock *rsock;
491
492 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
493 RELAYD_VERSION_COMM_MINOR);
494 if (!rsock) {
495 ret = LTTNG_ERR_FATAL;
496 goto error;
497 }
498
499 /*
500 * Connect to relayd so we can proceed with a session creation. This call
501 * can possibly block for an arbitrary amount of time to set the health
502 * state to be in poll execution.
503 */
504 health_poll_entry();
505 ret = relayd_connect(rsock);
506 health_poll_exit();
507 if (ret < 0) {
508 ERR("Unable to reach lttng-relayd");
509 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
510 goto free_sock;
511 }
512
513 /* Create socket for control stream. */
514 if (uri->stype == LTTNG_STREAM_CONTROL) {
515 DBG3("Creating relayd stream socket from URI");
516
517 /* Check relayd version */
518 ret = relayd_version_check(rsock);
519 if (ret < 0) {
520 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
521 goto close_sock;
522 }
523 } else if (uri->stype == LTTNG_STREAM_DATA) {
524 DBG3("Creating relayd data socket from URI");
525 } else {
526 /* Command is not valid */
527 ERR("Relayd invalid stream type: %d", uri->stype);
528 ret = LTTNG_ERR_INVALID;
529 goto close_sock;
530 }
531
532 *relayd_sock = rsock;
533
534 return LTTNG_OK;
535
536 close_sock:
537 /* The returned value is not useful since we are on an error path. */
538 (void) relayd_close(rsock);
539 free_sock:
540 free(rsock);
541 error:
542 return ret;
543 }
544
545 /*
546 * Connect to the relayd using URI and send the socket to the right consumer.
547 */
548 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
549 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
550 struct consumer_socket *consumer_sock)
551 {
552 int ret;
553 struct lttcomm_relayd_sock *rsock = NULL;
554
555 /* Connect to relayd and make version check if uri is the control. */
556 ret = create_connect_relayd(relayd_uri, &rsock);
557 if (ret != LTTNG_OK) {
558 goto error;
559 }
560 assert(rsock);
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 * The consumer output for this session should not be used anymore
604 * since the relayd connection failed thus making any tracing or/and
605 * streaming not usable.
606 */
607 consumer->enabled = 0;
608 }
609 return ret;
610 }
611
612 /*
613 * Send both relayd sockets to a specific consumer and domain. This is a
614 * helper function to facilitate sending the information to the consumer for a
615 * session.
616 */
617 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
618 struct consumer_output *consumer, struct consumer_socket *sock)
619 {
620 int ret = LTTNG_OK;
621
622 assert(consumer);
623 assert(sock);
624
625 /* Sending control relayd socket. */
626 if (!sock->control_sock_sent) {
627 ret = send_consumer_relayd_socket(domain, session_id,
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_id,
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 pthread_mutex_lock(socket->lock);
675 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
676 usess->consumer, socket);
677 pthread_mutex_unlock(socket->lock);
678 if (ret != LTTNG_OK) {
679 goto error;
680 }
681 /* Session is now ready for network streaming. */
682 session->net_handle = 1;
683 }
684 }
685
686 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
687 && ksess->consumer->enabled) {
688 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
689 socket, node.node) {
690 pthread_mutex_lock(socket->lock);
691 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
692 ksess->consumer, socket);
693 pthread_mutex_unlock(socket->lock);
694 if (ret != LTTNG_OK) {
695 goto error;
696 }
697 /* Session is now ready for network streaming. */
698 session->net_handle = 1;
699 }
700 }
701
702 error:
703 rcu_read_unlock();
704 return ret;
705 }
706
707 /*
708 * Start a kernel session by opening all necessary streams.
709 */
710 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
711 {
712 int ret;
713 struct ltt_kernel_channel *kchan;
714
715 /* Open kernel metadata */
716 if (ksess->metadata == NULL && ksess->output_traces) {
717 ret = kernel_open_metadata(ksess);
718 if (ret < 0) {
719 ret = LTTNG_ERR_KERN_META_FAIL;
720 goto error;
721 }
722 }
723
724 /* Open kernel metadata stream */
725 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
726 ret = kernel_open_metadata_stream(ksess);
727 if (ret < 0) {
728 ERR("Kernel create metadata stream failed");
729 ret = LTTNG_ERR_KERN_STREAM_FAIL;
730 goto error;
731 }
732 }
733
734 /* For each channel */
735 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
736 if (kchan->stream_count == 0) {
737 ret = kernel_open_channel_stream(kchan);
738 if (ret < 0) {
739 ret = LTTNG_ERR_KERN_STREAM_FAIL;
740 goto error;
741 }
742 /* Update the stream global counter */
743 ksess->stream_count_global += ret;
744 }
745 }
746
747 /* Setup kernel consumer socket and send fds to it */
748 ret = init_kernel_tracing(ksess);
749 if (ret != 0) {
750 ret = LTTNG_ERR_KERN_START_FAIL;
751 goto error;
752 }
753
754 /* This start the kernel tracing */
755 ret = kernel_start_session(ksess);
756 if (ret < 0) {
757 ret = LTTNG_ERR_KERN_START_FAIL;
758 goto error;
759 }
760
761 /* Quiescent wait after starting trace */
762 kernel_wait_quiescent(kernel_tracer_fd);
763
764 ksess->started = 1;
765
766 ret = LTTNG_OK;
767
768 error:
769 return ret;
770 }
771
772 /*
773 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
774 */
775 int cmd_disable_channel(struct ltt_session *session, int domain,
776 char *channel_name)
777 {
778 int ret;
779 struct ltt_ust_session *usess;
780
781 usess = session->ust_session;
782
783 rcu_read_lock();
784
785 switch (domain) {
786 case LTTNG_DOMAIN_KERNEL:
787 {
788 ret = channel_kernel_disable(session->kernel_session,
789 channel_name);
790 if (ret != LTTNG_OK) {
791 goto error;
792 }
793
794 kernel_wait_quiescent(kernel_tracer_fd);
795 break;
796 }
797 case LTTNG_DOMAIN_UST:
798 {
799 struct ltt_ust_channel *uchan;
800 struct lttng_ht *chan_ht;
801
802 chan_ht = usess->domain_global.channels;
803
804 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
805 if (uchan == NULL) {
806 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
807 goto error;
808 }
809
810 ret = channel_ust_disable(usess, uchan);
811 if (ret != LTTNG_OK) {
812 goto error;
813 }
814 break;
815 }
816 #if 0
817 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
818 case LTTNG_DOMAIN_UST_EXEC_NAME:
819 case LTTNG_DOMAIN_UST_PID:
820 #endif
821 default:
822 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
823 goto error;
824 }
825
826 ret = LTTNG_OK;
827
828 error:
829 rcu_read_unlock();
830 return ret;
831 }
832
833 /*
834 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
835 *
836 * The wpipe arguments is used as a notifier for the kernel thread.
837 */
838 int cmd_enable_channel(struct ltt_session *session,
839 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
840 {
841 int ret;
842 struct ltt_ust_session *usess = session->ust_session;
843 struct lttng_ht *chan_ht;
844
845 assert(session);
846 assert(attr);
847 assert(domain);
848
849 DBG("Enabling channel %s for session %s", attr->name, session->name);
850
851 rcu_read_lock();
852
853 switch (domain->type) {
854 case LTTNG_DOMAIN_KERNEL:
855 {
856 struct ltt_kernel_channel *kchan;
857
858 kchan = trace_kernel_get_channel_by_name(attr->name,
859 session->kernel_session);
860 if (kchan == NULL) {
861 /*
862 * Don't try to create a channel if the session
863 * has been started at some point in time
864 * before. The tracer does not allow it.
865 */
866 if (session->started) {
867 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
868 goto error;
869 }
870 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
871 if (attr->name[0] != '\0') {
872 session->kernel_session->has_non_default_channel = 1;
873 }
874 } else {
875 ret = channel_kernel_enable(session->kernel_session, kchan);
876 }
877
878 if (ret != LTTNG_OK) {
879 goto error;
880 }
881
882 kernel_wait_quiescent(kernel_tracer_fd);
883 break;
884 }
885 case LTTNG_DOMAIN_UST:
886 {
887 struct ltt_ust_channel *uchan;
888
889 chan_ht = usess->domain_global.channels;
890
891 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
892 if (uchan == NULL) {
893 /*
894 * Don't try to create a channel if the session
895 * has been started at some point in time
896 * before. The tracer does not allow it.
897 */
898 if (session->started) {
899 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
900 goto error;
901 }
902 ret = channel_ust_create(usess, attr, domain->buf_type);
903 if (attr->name[0] != '\0') {
904 usess->has_non_default_channel = 1;
905 }
906 } else {
907 ret = channel_ust_enable(usess, uchan);
908 }
909 break;
910 }
911 default:
912 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
913 goto error;
914 }
915
916 error:
917 rcu_read_unlock();
918 return ret;
919 }
920
921
922 /*
923 * Command LTTNG_DISABLE_EVENT processed by the client thread.
924 */
925 int cmd_disable_event(struct ltt_session *session, int domain,
926 char *channel_name, char *event_name)
927 {
928 int ret;
929
930 rcu_read_lock();
931
932 switch (domain) {
933 case LTTNG_DOMAIN_KERNEL:
934 {
935 struct ltt_kernel_channel *kchan;
936 struct ltt_kernel_session *ksess;
937
938 ksess = session->kernel_session;
939
940 /*
941 * If a non-default channel has been created in the
942 * session, explicitely require that -c chan_name needs
943 * to be provided.
944 */
945 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
946 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
947 goto error;
948 }
949
950 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
951 if (kchan == NULL) {
952 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
953 goto error;
954 }
955
956 ret = event_kernel_disable_tracepoint(kchan, event_name);
957 if (ret != LTTNG_OK) {
958 goto error;
959 }
960
961 kernel_wait_quiescent(kernel_tracer_fd);
962 break;
963 }
964 case LTTNG_DOMAIN_UST:
965 {
966 struct ltt_ust_channel *uchan;
967 struct ltt_ust_session *usess;
968
969 usess = session->ust_session;
970
971 /*
972 * If a non-default channel has been created in the
973 * session, explicitely require that -c chan_name needs
974 * to be provided.
975 */
976 if (usess->has_non_default_channel && channel_name[0] == '\0') {
977 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
978 goto error;
979 }
980
981 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
982 channel_name);
983 if (uchan == NULL) {
984 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
985 goto error;
986 }
987
988 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
989 if (ret != LTTNG_OK) {
990 goto error;
991 }
992
993 DBG3("Disable UST event %s in channel %s completed", event_name,
994 channel_name);
995 break;
996 }
997 #if 0
998 case LTTNG_DOMAIN_UST_EXEC_NAME:
999 case LTTNG_DOMAIN_UST_PID:
1000 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1001 #endif
1002 default:
1003 ret = LTTNG_ERR_UND;
1004 goto error;
1005 }
1006
1007 ret = LTTNG_OK;
1008
1009 error:
1010 rcu_read_unlock();
1011 return ret;
1012 }
1013
1014 /*
1015 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
1016 */
1017 int cmd_disable_event_all(struct ltt_session *session, int domain,
1018 char *channel_name)
1019 {
1020 int ret;
1021
1022 rcu_read_lock();
1023
1024 switch (domain) {
1025 case LTTNG_DOMAIN_KERNEL:
1026 {
1027 struct ltt_kernel_session *ksess;
1028 struct ltt_kernel_channel *kchan;
1029
1030 ksess = session->kernel_session;
1031
1032 /*
1033 * If a non-default channel has been created in the
1034 * session, explicitely require that -c chan_name needs
1035 * to be provided.
1036 */
1037 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1038 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1039 goto error;
1040 }
1041
1042 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1043 if (kchan == NULL) {
1044 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1045 goto error;
1046 }
1047
1048 ret = event_kernel_disable_all(kchan);
1049 if (ret != LTTNG_OK) {
1050 goto error;
1051 }
1052
1053 kernel_wait_quiescent(kernel_tracer_fd);
1054 break;
1055 }
1056 case LTTNG_DOMAIN_UST:
1057 {
1058 struct ltt_ust_session *usess;
1059 struct ltt_ust_channel *uchan;
1060
1061 usess = session->ust_session;
1062
1063 /*
1064 * If a non-default channel has been created in the
1065 * session, explicitely require that -c chan_name needs
1066 * to be provided.
1067 */
1068 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1069 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1070 goto error;
1071 }
1072
1073 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1074 channel_name);
1075 if (uchan == NULL) {
1076 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1077 goto error;
1078 }
1079
1080 ret = event_ust_disable_all_tracepoints(usess, uchan);
1081 if (ret != 0) {
1082 goto error;
1083 }
1084
1085 DBG3("Disable all UST events in channel %s completed", channel_name);
1086
1087 break;
1088 }
1089 #if 0
1090 case LTTNG_DOMAIN_UST_EXEC_NAME:
1091 case LTTNG_DOMAIN_UST_PID:
1092 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1093 #endif
1094 default:
1095 ret = LTTNG_ERR_UND;
1096 goto error;
1097 }
1098
1099 ret = LTTNG_OK;
1100
1101 error:
1102 rcu_read_unlock();
1103 return ret;
1104 }
1105
1106 /*
1107 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1108 */
1109 int cmd_add_context(struct ltt_session *session, int domain,
1110 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1111 {
1112 int ret, chan_kern_created = 0, chan_ust_created = 0;
1113
1114 switch (domain) {
1115 case LTTNG_DOMAIN_KERNEL:
1116 assert(session->kernel_session);
1117
1118 if (session->kernel_session->channel_count == 0) {
1119 /* Create default channel */
1120 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1121 if (ret != LTTNG_OK) {
1122 goto error;
1123 }
1124 chan_kern_created = 1;
1125 }
1126 /* Add kernel context to kernel tracer */
1127 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1128 if (ret != LTTNG_OK) {
1129 goto error;
1130 }
1131 break;
1132 case LTTNG_DOMAIN_UST:
1133 {
1134 struct ltt_ust_session *usess = session->ust_session;
1135 unsigned int chan_count;
1136
1137 assert(usess);
1138
1139 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1140 if (chan_count == 0) {
1141 struct lttng_channel *attr;
1142 /* Create default channel */
1143 attr = channel_new_default_attr(domain, usess->buffer_type);
1144 if (attr == NULL) {
1145 ret = LTTNG_ERR_FATAL;
1146 goto error;
1147 }
1148
1149 ret = channel_ust_create(usess, attr, usess->buffer_type);
1150 if (ret != LTTNG_OK) {
1151 free(attr);
1152 goto error;
1153 }
1154 free(attr);
1155 chan_ust_created = 1;
1156 }
1157
1158 ret = context_ust_add(usess, domain, ctx, channel_name);
1159 if (ret != LTTNG_OK) {
1160 goto error;
1161 }
1162 break;
1163 }
1164 #if 0
1165 case LTTNG_DOMAIN_UST_EXEC_NAME:
1166 case LTTNG_DOMAIN_UST_PID:
1167 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1168 #endif
1169 default:
1170 ret = LTTNG_ERR_UND;
1171 goto error;
1172 }
1173
1174 return LTTNG_OK;
1175
1176 error:
1177 if (chan_kern_created) {
1178 struct ltt_kernel_channel *kchan =
1179 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1180 session->kernel_session);
1181 /* Created previously, this should NOT fail. */
1182 assert(kchan);
1183 kernel_destroy_channel(kchan);
1184 }
1185
1186 if (chan_ust_created) {
1187 struct ltt_ust_channel *uchan =
1188 trace_ust_find_channel_by_name(
1189 session->ust_session->domain_global.channels,
1190 DEFAULT_CHANNEL_NAME);
1191 /* Created previously, this should NOT fail. */
1192 assert(uchan);
1193 /* Remove from the channel list of the session. */
1194 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1195 uchan);
1196 trace_ust_destroy_channel(uchan);
1197 }
1198 return ret;
1199 }
1200
1201 /*
1202 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1203 */
1204 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1205 char *channel_name, struct lttng_event *event,
1206 struct lttng_filter_bytecode *filter, int wpipe)
1207 {
1208 int ret, channel_created = 0;
1209 struct lttng_channel *attr;
1210
1211 assert(session);
1212 assert(event);
1213 assert(channel_name);
1214
1215 rcu_read_lock();
1216
1217 switch (domain->type) {
1218 case LTTNG_DOMAIN_KERNEL:
1219 {
1220 struct ltt_kernel_channel *kchan;
1221
1222 /*
1223 * If a non-default channel has been created in the
1224 * session, explicitely require that -c chan_name needs
1225 * to be provided.
1226 */
1227 if (session->kernel_session->has_non_default_channel
1228 && channel_name[0] == '\0') {
1229 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1230 goto error;
1231 }
1232
1233 kchan = trace_kernel_get_channel_by_name(channel_name,
1234 session->kernel_session);
1235 if (kchan == NULL) {
1236 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1237 LTTNG_BUFFER_GLOBAL);
1238 if (attr == NULL) {
1239 ret = LTTNG_ERR_FATAL;
1240 goto error;
1241 }
1242 strncpy(attr->name, channel_name, sizeof(attr->name));
1243
1244 ret = cmd_enable_channel(session, domain, attr, wpipe);
1245 if (ret != LTTNG_OK) {
1246 free(attr);
1247 goto error;
1248 }
1249 free(attr);
1250
1251 channel_created = 1;
1252 }
1253
1254 /* Get the newly created kernel channel pointer */
1255 kchan = trace_kernel_get_channel_by_name(channel_name,
1256 session->kernel_session);
1257 if (kchan == NULL) {
1258 /* This sould not happen... */
1259 ret = LTTNG_ERR_FATAL;
1260 goto error;
1261 }
1262
1263 ret = event_kernel_enable_tracepoint(kchan, event);
1264 if (ret != LTTNG_OK) {
1265 if (channel_created) {
1266 /* Let's not leak a useless channel. */
1267 kernel_destroy_channel(kchan);
1268 }
1269 goto error;
1270 }
1271
1272 kernel_wait_quiescent(kernel_tracer_fd);
1273 break;
1274 }
1275 case LTTNG_DOMAIN_UST:
1276 {
1277 struct ltt_ust_channel *uchan;
1278 struct ltt_ust_session *usess = session->ust_session;
1279
1280 assert(usess);
1281
1282 /*
1283 * If a non-default channel has been created in the
1284 * session, explicitely require that -c chan_name needs
1285 * to be provided.
1286 */
1287 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1288 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1289 goto error;
1290 }
1291
1292 /* Get channel from global UST domain */
1293 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1294 channel_name);
1295 if (uchan == NULL) {
1296 /* Create default channel */
1297 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1298 usess->buffer_type);
1299 if (attr == NULL) {
1300 ret = LTTNG_ERR_FATAL;
1301 goto error;
1302 }
1303 strncpy(attr->name, channel_name, sizeof(attr->name));
1304
1305 ret = cmd_enable_channel(session, domain, attr, wpipe);
1306 if (ret != LTTNG_OK) {
1307 free(attr);
1308 goto error;
1309 }
1310 free(attr);
1311
1312 /* Get the newly created channel reference back */
1313 uchan = trace_ust_find_channel_by_name(
1314 usess->domain_global.channels, channel_name);
1315 assert(uchan);
1316 }
1317
1318 /* At this point, the session and channel exist on the tracer */
1319 ret = event_ust_enable_tracepoint(usess, uchan, event, filter);
1320 if (ret != LTTNG_OK) {
1321 goto error;
1322 }
1323 break;
1324 }
1325 #if 0
1326 case LTTNG_DOMAIN_UST_EXEC_NAME:
1327 case LTTNG_DOMAIN_UST_PID:
1328 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1329 #endif
1330 default:
1331 ret = LTTNG_ERR_UND;
1332 goto error;
1333 }
1334
1335 ret = LTTNG_OK;
1336
1337 error:
1338 rcu_read_unlock();
1339 return ret;
1340 }
1341
1342 /*
1343 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
1344 */
1345 int cmd_enable_event_all(struct ltt_session *session,
1346 struct lttng_domain *domain, char *channel_name, int event_type,
1347 struct lttng_filter_bytecode *filter, int wpipe)
1348 {
1349 int ret;
1350 struct lttng_channel *attr;
1351
1352 assert(session);
1353 assert(channel_name);
1354
1355 rcu_read_lock();
1356
1357 switch (domain->type) {
1358 case LTTNG_DOMAIN_KERNEL:
1359 {
1360 struct ltt_kernel_channel *kchan;
1361
1362 assert(session->kernel_session);
1363
1364 /*
1365 * If a non-default channel has been created in the
1366 * session, explicitely require that -c chan_name needs
1367 * to be provided.
1368 */
1369 if (session->kernel_session->has_non_default_channel
1370 && channel_name[0] == '\0') {
1371 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1372 goto error;
1373 }
1374
1375 kchan = trace_kernel_get_channel_by_name(channel_name,
1376 session->kernel_session);
1377 if (kchan == NULL) {
1378 /* Create default channel */
1379 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1380 LTTNG_BUFFER_GLOBAL);
1381 if (attr == NULL) {
1382 ret = LTTNG_ERR_FATAL;
1383 goto error;
1384 }
1385 strncpy(attr->name, channel_name, sizeof(attr->name));
1386
1387 ret = cmd_enable_channel(session, domain, attr, wpipe);
1388 if (ret != LTTNG_OK) {
1389 free(attr);
1390 goto error;
1391 }
1392 free(attr);
1393
1394 /* Get the newly created kernel channel pointer */
1395 kchan = trace_kernel_get_channel_by_name(channel_name,
1396 session->kernel_session);
1397 assert(kchan);
1398 }
1399
1400 switch (event_type) {
1401 case LTTNG_EVENT_SYSCALL:
1402 ret = event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd);
1403 break;
1404 case LTTNG_EVENT_TRACEPOINT:
1405 /*
1406 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
1407 * events already registered to the channel.
1408 */
1409 ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd);
1410 break;
1411 case LTTNG_EVENT_ALL:
1412 /* Enable syscalls and tracepoints */
1413 ret = event_kernel_enable_all(kchan, kernel_tracer_fd);
1414 break;
1415 default:
1416 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1417 goto error;
1418 }
1419
1420 /* Manage return value */
1421 if (ret != LTTNG_OK) {
1422 /*
1423 * On error, cmd_enable_channel call will take care of destroying
1424 * the created channel if it was needed.
1425 */
1426 goto error;
1427 }
1428
1429 kernel_wait_quiescent(kernel_tracer_fd);
1430 break;
1431 }
1432 case LTTNG_DOMAIN_UST:
1433 {
1434 struct ltt_ust_channel *uchan;
1435 struct ltt_ust_session *usess = session->ust_session;
1436
1437 assert(usess);
1438
1439 /*
1440 * If a non-default channel has been created in the
1441 * session, explicitely require that -c chan_name needs
1442 * to be provided.
1443 */
1444 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1445 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1446 goto error;
1447 }
1448
1449 /* Get channel from global UST domain */
1450 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1451 channel_name);
1452 if (uchan == NULL) {
1453 /* Create default channel */
1454 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1455 usess->buffer_type);
1456 if (attr == NULL) {
1457 ret = LTTNG_ERR_FATAL;
1458 goto error;
1459 }
1460 strncpy(attr->name, channel_name, sizeof(attr->name));
1461
1462 ret = cmd_enable_channel(session, domain, attr, wpipe);
1463 if (ret != LTTNG_OK) {
1464 free(attr);
1465 goto error;
1466 }
1467 free(attr);
1468
1469 /* Get the newly created channel reference back */
1470 uchan = trace_ust_find_channel_by_name(
1471 usess->domain_global.channels, channel_name);
1472 assert(uchan);
1473 }
1474
1475 /* At this point, the session and channel exist on the tracer */
1476
1477 switch (event_type) {
1478 case LTTNG_EVENT_ALL:
1479 case LTTNG_EVENT_TRACEPOINT:
1480 ret = event_ust_enable_all_tracepoints(usess, uchan, filter);
1481 if (ret != LTTNG_OK) {
1482 goto error;
1483 }
1484 break;
1485 default:
1486 ret = LTTNG_ERR_UST_ENABLE_FAIL;
1487 goto error;
1488 }
1489
1490 /* Manage return value */
1491 if (ret != LTTNG_OK) {
1492 goto error;
1493 }
1494
1495 break;
1496 }
1497 #if 0
1498 case LTTNG_DOMAIN_UST_EXEC_NAME:
1499 case LTTNG_DOMAIN_UST_PID:
1500 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
1501 #endif
1502 default:
1503 ret = LTTNG_ERR_UND;
1504 goto error;
1505 }
1506
1507 ret = LTTNG_OK;
1508
1509 error:
1510 rcu_read_unlock();
1511 return ret;
1512 }
1513
1514
1515 /*
1516 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1517 */
1518 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1519 {
1520 int ret;
1521 ssize_t nb_events = 0;
1522
1523 switch (domain) {
1524 case LTTNG_DOMAIN_KERNEL:
1525 nb_events = kernel_list_events(kernel_tracer_fd, events);
1526 if (nb_events < 0) {
1527 ret = LTTNG_ERR_KERN_LIST_FAIL;
1528 goto error;
1529 }
1530 break;
1531 case LTTNG_DOMAIN_UST:
1532 nb_events = ust_app_list_events(events);
1533 if (nb_events < 0) {
1534 ret = LTTNG_ERR_UST_LIST_FAIL;
1535 goto error;
1536 }
1537 break;
1538 default:
1539 ret = LTTNG_ERR_UND;
1540 goto error;
1541 }
1542
1543 return nb_events;
1544
1545 error:
1546 /* Return negative value to differentiate return code */
1547 return -ret;
1548 }
1549
1550 /*
1551 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1552 */
1553 ssize_t cmd_list_tracepoint_fields(int domain,
1554 struct lttng_event_field **fields)
1555 {
1556 int ret;
1557 ssize_t nb_fields = 0;
1558
1559 switch (domain) {
1560 case LTTNG_DOMAIN_UST:
1561 nb_fields = ust_app_list_event_fields(fields);
1562 if (nb_fields < 0) {
1563 ret = LTTNG_ERR_UST_LIST_FAIL;
1564 goto error;
1565 }
1566 break;
1567 case LTTNG_DOMAIN_KERNEL:
1568 default: /* fall-through */
1569 ret = LTTNG_ERR_UND;
1570 goto error;
1571 }
1572
1573 return nb_fields;
1574
1575 error:
1576 /* Return negative value to differentiate return code */
1577 return -ret;
1578 }
1579
1580 /*
1581 * Command LTTNG_START_TRACE processed by the client thread.
1582 */
1583 int cmd_start_trace(struct ltt_session *session)
1584 {
1585 int ret;
1586 unsigned long nb_chan = 0;
1587 struct ltt_kernel_session *ksession;
1588 struct ltt_ust_session *usess;
1589
1590 assert(session);
1591
1592 /* Ease our life a bit ;) */
1593 ksession = session->kernel_session;
1594 usess = session->ust_session;
1595
1596 if (session->enabled) {
1597 /* Already started. */
1598 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1599 goto error;
1600 }
1601
1602 /*
1603 * Starting a session without channel is useless since after that it's not
1604 * possible to enable channel thus inform the client.
1605 */
1606 if (usess && usess->domain_global.channels) {
1607 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1608 }
1609 if (ksession) {
1610 nb_chan += ksession->channel_count;
1611 }
1612 if (!nb_chan) {
1613 ret = LTTNG_ERR_NO_CHANNEL;
1614 goto error;
1615 }
1616
1617 session->enabled = 1;
1618
1619 /* Kernel tracing */
1620 if (ksession != NULL) {
1621 ret = start_kernel_session(ksession, kernel_tracer_fd);
1622 if (ret != LTTNG_OK) {
1623 goto error;
1624 }
1625 }
1626
1627 /* Flag session that trace should start automatically */
1628 if (usess) {
1629 usess->start_trace = 1;
1630
1631 ret = ust_app_start_trace_all(usess);
1632 if (ret < 0) {
1633 ret = LTTNG_ERR_UST_START_FAIL;
1634 goto error;
1635 }
1636 }
1637
1638 session->started = 1;
1639
1640 ret = LTTNG_OK;
1641
1642 error:
1643 return ret;
1644 }
1645
1646 /*
1647 * Command LTTNG_STOP_TRACE processed by the client thread.
1648 */
1649 int cmd_stop_trace(struct ltt_session *session)
1650 {
1651 int ret;
1652 struct ltt_kernel_channel *kchan;
1653 struct ltt_kernel_session *ksession;
1654 struct ltt_ust_session *usess;
1655
1656 assert(session);
1657
1658 /* Short cut */
1659 ksession = session->kernel_session;
1660 usess = session->ust_session;
1661
1662 if (!session->enabled) {
1663 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1664 goto error;
1665 }
1666
1667 session->enabled = 0;
1668
1669 /* Kernel tracer */
1670 if (ksession && ksession->started) {
1671 DBG("Stop kernel tracing");
1672
1673 /* Flush metadata if exist */
1674 if (ksession->metadata_stream_fd >= 0) {
1675 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1676 if (ret < 0) {
1677 ERR("Kernel metadata flush failed");
1678 }
1679 }
1680
1681 /* Flush all buffers before stopping */
1682 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1683 ret = kernel_flush_buffer(kchan);
1684 if (ret < 0) {
1685 ERR("Kernel flush buffer error");
1686 }
1687 }
1688
1689 ret = kernel_stop_session(ksession);
1690 if (ret < 0) {
1691 ret = LTTNG_ERR_KERN_STOP_FAIL;
1692 goto error;
1693 }
1694
1695 kernel_wait_quiescent(kernel_tracer_fd);
1696
1697 ksession->started = 0;
1698 }
1699
1700 if (usess && usess->start_trace) {
1701 usess->start_trace = 0;
1702
1703 ret = ust_app_stop_trace_all(usess);
1704 if (ret < 0) {
1705 ret = LTTNG_ERR_UST_STOP_FAIL;
1706 goto error;
1707 }
1708 }
1709
1710 ret = LTTNG_OK;
1711
1712 error:
1713 return ret;
1714 }
1715
1716 /*
1717 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
1718 */
1719 int cmd_set_consumer_uri(int domain, struct ltt_session *session,
1720 size_t nb_uri, struct lttng_uri *uris)
1721 {
1722 int ret, i;
1723 struct ltt_kernel_session *ksess = session->kernel_session;
1724 struct ltt_ust_session *usess = session->ust_session;
1725 struct consumer_output *consumer = NULL;
1726
1727 assert(session);
1728 assert(uris);
1729 assert(nb_uri > 0);
1730
1731 /* Can't enable consumer after session started. */
1732 if (session->enabled) {
1733 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1734 goto error;
1735 }
1736
1737 /*
1738 * This case switch makes sure the domain session has a temporary consumer
1739 * so the URL can be set.
1740 */
1741 switch (domain) {
1742 case 0:
1743 /* Code flow error. A session MUST always have a consumer object */
1744 assert(session->consumer);
1745 /*
1746 * The URL will be added to the tracing session consumer instead of a
1747 * specific domain consumer.
1748 */
1749 consumer = session->consumer;
1750 break;
1751 case LTTNG_DOMAIN_KERNEL:
1752 /* Code flow error if we don't have a kernel session here. */
1753 assert(ksess);
1754 assert(ksess->consumer);
1755 consumer = ksess->consumer;
1756 break;
1757 case LTTNG_DOMAIN_UST:
1758 /* Code flow error if we don't have a kernel session here. */
1759 assert(usess);
1760 assert(usess->consumer);
1761 consumer = usess->consumer;
1762 break;
1763 }
1764
1765 for (i = 0; i < nb_uri; i++) {
1766 ret = add_uri_to_consumer(consumer, &uris[i], domain, session->name);
1767 if (ret != LTTNG_OK) {
1768 goto error;
1769 }
1770 }
1771
1772 /* All good! */
1773 ret = LTTNG_OK;
1774
1775 error:
1776 return ret;
1777 }
1778
1779 /*
1780 * Command LTTNG_CREATE_SESSION processed by the client thread.
1781 */
1782 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
1783 size_t nb_uri, lttng_sock_cred *creds)
1784 {
1785 int ret;
1786 struct ltt_session *session;
1787
1788 assert(name);
1789 assert(creds);
1790
1791 /*
1792 * Verify if the session already exist
1793 *
1794 * XXX: There is no need for the session lock list here since the caller
1795 * (process_client_msg) is holding it. We might want to change that so a
1796 * single command does not lock the entire session list.
1797 */
1798 session = session_find_by_name(name);
1799 if (session != NULL) {
1800 ret = LTTNG_ERR_EXIST_SESS;
1801 goto find_error;
1802 }
1803
1804 /* Create tracing session in the registry */
1805 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
1806 LTTNG_SOCK_GET_GID_CRED(creds));
1807 if (ret != LTTNG_OK) {
1808 goto session_error;
1809 }
1810
1811 /*
1812 * Get the newly created session pointer back
1813 *
1814 * XXX: There is no need for the session lock list here since the caller
1815 * (process_client_msg) is holding it. We might want to change that so a
1816 * single command does not lock the entire session list.
1817 */
1818 session = session_find_by_name(name);
1819 assert(session);
1820
1821 /* Create default consumer output for the session not yet created. */
1822 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
1823 if (session->consumer == NULL) {
1824 ret = LTTNG_ERR_FATAL;
1825 goto consumer_error;
1826 }
1827
1828 if (uris) {
1829 ret = cmd_set_consumer_uri(0, session, nb_uri, uris);
1830 if (ret != LTTNG_OK) {
1831 goto consumer_error;
1832 }
1833 session->output_traces = 1;
1834 } else {
1835 session->output_traces = 0;
1836 DBG2("Session %s created with no output", session->name);
1837 }
1838
1839 session->consumer->enabled = 1;
1840
1841 return LTTNG_OK;
1842
1843 consumer_error:
1844 session_destroy(session);
1845 session_error:
1846 find_error:
1847 return ret;
1848 }
1849
1850 /*
1851 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
1852 */
1853 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
1854 size_t nb_uri, lttng_sock_cred *creds)
1855 {
1856 int ret;
1857 struct ltt_session *session;
1858 struct snapshot_output *new_output = NULL;
1859
1860 assert(name);
1861 assert(creds);
1862
1863 /*
1864 * Create session in no output mode with URIs set to NULL. The uris we've
1865 * received are for a default snapshot output if one.
1866 */
1867 ret = cmd_create_session_uri(name, NULL, 0, creds);
1868 if (ret != LTTNG_OK) {
1869 goto error;
1870 }
1871
1872 /* Get the newly created session pointer back. This should NEVER fail. */
1873 session = session_find_by_name(name);
1874 assert(session);
1875
1876 /* Flag session for snapshot mode. */
1877 session->snapshot_mode = 1;
1878
1879 /* Skip snapshot output creation if no URI is given. */
1880 if (nb_uri == 0) {
1881 goto end;
1882 }
1883
1884 new_output = snapshot_output_alloc();
1885 if (!new_output) {
1886 ret = LTTNG_ERR_NOMEM;
1887 goto error_snapshot_alloc;
1888 }
1889
1890 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
1891 uris, nb_uri, session->consumer, new_output, &session->snapshot);
1892 if (ret < 0) {
1893 if (ret == -ENOMEM) {
1894 ret = LTTNG_ERR_NOMEM;
1895 } else {
1896 ret = LTTNG_ERR_INVALID;
1897 }
1898 goto error_snapshot;
1899 }
1900
1901 rcu_read_lock();
1902 snapshot_add_output(&session->snapshot, new_output);
1903 rcu_read_unlock();
1904
1905 end:
1906 return LTTNG_OK;
1907
1908 error_snapshot:
1909 snapshot_output_destroy(new_output);
1910 error_snapshot_alloc:
1911 session_destroy(session);
1912 error:
1913 return ret;
1914 }
1915
1916 /*
1917 * Command LTTNG_DESTROY_SESSION processed by the client thread.
1918 */
1919 int cmd_destroy_session(struct ltt_session *session, int wpipe)
1920 {
1921 int ret;
1922 struct ltt_ust_session *usess;
1923 struct ltt_kernel_session *ksess;
1924
1925 /* Safety net */
1926 assert(session);
1927
1928 usess = session->ust_session;
1929 ksess = session->kernel_session;
1930
1931 /* Clean kernel session teardown */
1932 kernel_destroy_session(ksess);
1933
1934 /* UST session teardown */
1935 if (usess) {
1936 /* Close any relayd session */
1937 consumer_output_send_destroy_relayd(usess->consumer);
1938
1939 /* Destroy every UST application related to this session. */
1940 ret = ust_app_destroy_trace_all(usess);
1941 if (ret) {
1942 ERR("Error in ust_app_destroy_trace_all");
1943 }
1944
1945 /* Clean up the rest. */
1946 trace_ust_destroy_session(usess);
1947 }
1948
1949 /*
1950 * Must notify the kernel thread here to update it's poll set in order to
1951 * remove the channel(s)' fd just destroyed.
1952 */
1953 ret = notify_thread_pipe(wpipe);
1954 if (ret < 0) {
1955 PERROR("write kernel poll pipe");
1956 }
1957
1958 ret = session_destroy(session);
1959
1960 return ret;
1961 }
1962
1963 /*
1964 * Command LTTNG_CALIBRATE processed by the client thread.
1965 */
1966 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
1967 {
1968 int ret;
1969
1970 switch (domain) {
1971 case LTTNG_DOMAIN_KERNEL:
1972 {
1973 struct lttng_kernel_calibrate kcalibrate;
1974
1975 switch (calibrate->type) {
1976 case LTTNG_CALIBRATE_FUNCTION:
1977 default:
1978 /* Default and only possible calibrate option. */
1979 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
1980 break;
1981 }
1982
1983 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
1984 if (ret < 0) {
1985 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
1986 goto error;
1987 }
1988 break;
1989 }
1990 case LTTNG_DOMAIN_UST:
1991 {
1992 struct lttng_ust_calibrate ucalibrate;
1993
1994 switch (calibrate->type) {
1995 case LTTNG_CALIBRATE_FUNCTION:
1996 default:
1997 /* Default and only possible calibrate option. */
1998 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
1999 break;
2000 }
2001
2002 ret = ust_app_calibrate_glb(&ucalibrate);
2003 if (ret < 0) {
2004 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2005 goto error;
2006 }
2007 break;
2008 }
2009 default:
2010 ret = LTTNG_ERR_UND;
2011 goto error;
2012 }
2013
2014 ret = LTTNG_OK;
2015
2016 error:
2017 return ret;
2018 }
2019
2020 /*
2021 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2022 */
2023 int cmd_register_consumer(struct ltt_session *session, int domain,
2024 const char *sock_path, struct consumer_data *cdata)
2025 {
2026 int ret, sock;
2027 struct consumer_socket *socket = NULL;
2028
2029 assert(session);
2030 assert(cdata);
2031 assert(sock_path);
2032
2033 switch (domain) {
2034 case LTTNG_DOMAIN_KERNEL:
2035 {
2036 struct ltt_kernel_session *ksess = session->kernel_session;
2037
2038 assert(ksess);
2039
2040 /* Can't register a consumer if there is already one */
2041 if (ksess->consumer_fds_sent != 0) {
2042 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2043 goto error;
2044 }
2045
2046 sock = lttcomm_connect_unix_sock(sock_path);
2047 if (sock < 0) {
2048 ret = LTTNG_ERR_CONNECT_FAIL;
2049 goto error;
2050 }
2051 cdata->cmd_sock = sock;
2052
2053 socket = consumer_allocate_socket(&cdata->cmd_sock);
2054 if (socket == NULL) {
2055 ret = close(sock);
2056 if (ret < 0) {
2057 PERROR("close register consumer");
2058 }
2059 cdata->cmd_sock = -1;
2060 ret = LTTNG_ERR_FATAL;
2061 goto error;
2062 }
2063
2064 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2065 if (socket->lock == NULL) {
2066 PERROR("zmalloc pthread mutex");
2067 ret = LTTNG_ERR_FATAL;
2068 goto error;
2069 }
2070 pthread_mutex_init(socket->lock, NULL);
2071 socket->registered = 1;
2072
2073 rcu_read_lock();
2074 consumer_add_socket(socket, ksess->consumer);
2075 rcu_read_unlock();
2076
2077 pthread_mutex_lock(&cdata->pid_mutex);
2078 cdata->pid = -1;
2079 pthread_mutex_unlock(&cdata->pid_mutex);
2080
2081 break;
2082 }
2083 default:
2084 /* TODO: Userspace tracing */
2085 ret = LTTNG_ERR_UND;
2086 goto error;
2087 }
2088
2089 return LTTNG_OK;
2090
2091 error:
2092 if (socket) {
2093 consumer_destroy_socket(socket);
2094 }
2095 return ret;
2096 }
2097
2098 /*
2099 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2100 */
2101 ssize_t cmd_list_domains(struct ltt_session *session,
2102 struct lttng_domain **domains)
2103 {
2104 int ret, index = 0;
2105 ssize_t nb_dom = 0;
2106
2107 if (session->kernel_session != NULL) {
2108 DBG3("Listing domains found kernel domain");
2109 nb_dom++;
2110 }
2111
2112 if (session->ust_session != NULL) {
2113 DBG3("Listing domains found UST global domain");
2114 nb_dom++;
2115 }
2116
2117 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2118 if (*domains == NULL) {
2119 ret = LTTNG_ERR_FATAL;
2120 goto error;
2121 }
2122
2123 if (session->kernel_session != NULL) {
2124 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2125 index++;
2126 }
2127
2128 if (session->ust_session != NULL) {
2129 (*domains)[index].type = LTTNG_DOMAIN_UST;
2130 (*domains)[index].buf_type = session->ust_session->buffer_type;
2131 index++;
2132 }
2133
2134 return nb_dom;
2135
2136 error:
2137 /* Return negative value to differentiate return code */
2138 return -ret;
2139 }
2140
2141
2142 /*
2143 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2144 */
2145 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2146 struct lttng_channel **channels)
2147 {
2148 int ret;
2149 ssize_t nb_chan = 0;
2150
2151 switch (domain) {
2152 case LTTNG_DOMAIN_KERNEL:
2153 if (session->kernel_session != NULL) {
2154 nb_chan = session->kernel_session->channel_count;
2155 }
2156 DBG3("Number of kernel channels %zd", nb_chan);
2157 if (nb_chan <= 0) {
2158 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2159 }
2160 break;
2161 case LTTNG_DOMAIN_UST:
2162 if (session->ust_session != NULL) {
2163 nb_chan = lttng_ht_get_count(
2164 session->ust_session->domain_global.channels);
2165 }
2166 DBG3("Number of UST global channels %zd", nb_chan);
2167 if (nb_chan <= 0) {
2168 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2169 }
2170 break;
2171 default:
2172 *channels = NULL;
2173 ret = LTTNG_ERR_UND;
2174 goto error;
2175 }
2176
2177 if (nb_chan > 0) {
2178 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2179 if (*channels == NULL) {
2180 ret = LTTNG_ERR_FATAL;
2181 goto error;
2182 }
2183
2184 list_lttng_channels(domain, session, *channels);
2185 } else {
2186 *channels = NULL;
2187 /* Ret value was set in the domain switch case */
2188 goto error;
2189 }
2190
2191 return nb_chan;
2192
2193 error:
2194 /* Return negative value to differentiate return code */
2195 return -ret;
2196 }
2197
2198 /*
2199 * Command LTTNG_LIST_EVENTS processed by the client thread.
2200 */
2201 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2202 char *channel_name, struct lttng_event **events)
2203 {
2204 int ret = 0;
2205 ssize_t nb_event = 0;
2206
2207 switch (domain) {
2208 case LTTNG_DOMAIN_KERNEL:
2209 if (session->kernel_session != NULL) {
2210 nb_event = list_lttng_kernel_events(channel_name,
2211 session->kernel_session, events);
2212 }
2213 break;
2214 case LTTNG_DOMAIN_UST:
2215 {
2216 if (session->ust_session != NULL) {
2217 nb_event = list_lttng_ust_global_events(channel_name,
2218 &session->ust_session->domain_global, events);
2219 }
2220 break;
2221 }
2222 default:
2223 ret = LTTNG_ERR_UND;
2224 goto error;
2225 }
2226
2227 return nb_event;
2228
2229 error:
2230 /* Return negative value to differentiate return code */
2231 return -ret;
2232 }
2233
2234 /*
2235 * Using the session list, filled a lttng_session array to send back to the
2236 * client for session listing.
2237 *
2238 * The session list lock MUST be acquired before calling this function. Use
2239 * session_lock_list() and session_unlock_list().
2240 */
2241 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2242 gid_t gid)
2243 {
2244 int ret;
2245 unsigned int i = 0;
2246 struct ltt_session *session;
2247 struct ltt_session_list *list = session_get_list();
2248
2249 DBG("Getting all available session for UID %d GID %d",
2250 uid, gid);
2251 /*
2252 * Iterate over session list and append data after the control struct in
2253 * the buffer.
2254 */
2255 cds_list_for_each_entry(session, &list->head, list) {
2256 /*
2257 * Only list the sessions the user can control.
2258 */
2259 if (!session_access_ok(session, uid, gid)) {
2260 continue;
2261 }
2262
2263 struct ltt_kernel_session *ksess = session->kernel_session;
2264 struct ltt_ust_session *usess = session->ust_session;
2265
2266 if (session->consumer->type == CONSUMER_DST_NET ||
2267 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2268 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2269 ret = build_network_session_path(sessions[i].path,
2270 sizeof(sessions[i].path), session);
2271 } else {
2272 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2273 session->consumer->dst.trace_path);
2274 }
2275 if (ret < 0) {
2276 PERROR("snprintf session path");
2277 continue;
2278 }
2279
2280 strncpy(sessions[i].name, session->name, NAME_MAX);
2281 sessions[i].name[NAME_MAX - 1] = '\0';
2282 sessions[i].enabled = session->enabled;
2283 sessions[i].snapshot_mode = session->snapshot_mode;
2284 i++;
2285 }
2286 }
2287
2288 /*
2289 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2290 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2291 */
2292 int cmd_data_pending(struct ltt_session *session)
2293 {
2294 int ret;
2295 struct ltt_kernel_session *ksess = session->kernel_session;
2296 struct ltt_ust_session *usess = session->ust_session;
2297
2298 assert(session);
2299
2300 /* Session MUST be stopped to ask for data availability. */
2301 if (session->enabled) {
2302 ret = LTTNG_ERR_SESSION_STARTED;
2303 goto error;
2304 } else {
2305 /*
2306 * If stopped, just make sure we've started before else the above call
2307 * will always send that there is data pending.
2308 *
2309 * The consumer assumes that when the data pending command is received,
2310 * the trace has been started before or else no output data is written
2311 * by the streams which is a condition for data pending. So, this is
2312 * *VERY* important that we don't ask the consumer before a start
2313 * trace.
2314 */
2315 if (!session->started) {
2316 ret = 0;
2317 goto error;
2318 }
2319 }
2320
2321 if (ksess && ksess->consumer) {
2322 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2323 if (ret == 1) {
2324 /* Data is still being extracted for the kernel. */
2325 goto error;
2326 }
2327 }
2328
2329 if (usess && usess->consumer) {
2330 ret = consumer_is_data_pending(usess->id, usess->consumer);
2331 if (ret == 1) {
2332 /* Data is still being extracted for the kernel. */
2333 goto error;
2334 }
2335 }
2336
2337 /* Data is ready to be read by a viewer */
2338 ret = 0;
2339
2340 error:
2341 return ret;
2342 }
2343
2344 /*
2345 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2346 *
2347 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2348 */
2349 int cmd_snapshot_add_output(struct ltt_session *session,
2350 struct lttng_snapshot_output *output, uint32_t *id)
2351 {
2352 int ret;
2353 struct snapshot_output *new_output;
2354
2355 assert(session);
2356 assert(output);
2357
2358 DBG("Cmd snapshot add output for session %s", session->name);
2359
2360 /*
2361 * Permission denied to create an output if the session is not
2362 * set in no output mode.
2363 */
2364 if (session->output_traces) {
2365 ret = LTTNG_ERR_EPERM;
2366 goto error;
2367 }
2368
2369 /* Only one output is allowed until we have the "tee" feature. */
2370 if (session->snapshot.nb_output == 1) {
2371 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2372 goto error;
2373 }
2374
2375 new_output = snapshot_output_alloc();
2376 if (!new_output) {
2377 ret = LTTNG_ERR_NOMEM;
2378 goto error;
2379 }
2380
2381 ret = snapshot_output_init(output->max_size, output->name,
2382 output->ctrl_url, output->data_url, session->consumer, new_output,
2383 &session->snapshot);
2384 if (ret < 0) {
2385 if (ret == -ENOMEM) {
2386 ret = LTTNG_ERR_NOMEM;
2387 } else {
2388 ret = LTTNG_ERR_INVALID;
2389 }
2390 goto free_error;
2391 }
2392
2393 rcu_read_lock();
2394 snapshot_add_output(&session->snapshot, new_output);
2395 if (id) {
2396 *id = new_output->id;
2397 }
2398 rcu_read_unlock();
2399
2400 return LTTNG_OK;
2401
2402 free_error:
2403 snapshot_output_destroy(new_output);
2404 error:
2405 return ret;
2406 }
2407
2408 /*
2409 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2410 *
2411 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2412 */
2413 int cmd_snapshot_del_output(struct ltt_session *session,
2414 struct lttng_snapshot_output *output)
2415 {
2416 int ret;
2417 struct snapshot_output *sout = NULL;
2418
2419 assert(session);
2420 assert(output);
2421
2422 rcu_read_lock();
2423
2424 /*
2425 * Permission denied to create an output if the session is not
2426 * set in no output mode.
2427 */
2428 if (session->output_traces) {
2429 ret = LTTNG_ERR_EPERM;
2430 goto error;
2431 }
2432
2433 if (output->id) {
2434 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2435 session->name);
2436 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2437 } else if (*output->name != '\0') {
2438 DBG("Cmd snapshot del output name %s for session %s", output->name,
2439 session->name);
2440 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2441 }
2442 if (!sout) {
2443 ret = LTTNG_ERR_INVALID;
2444 goto error;
2445 }
2446
2447 snapshot_delete_output(&session->snapshot, sout);
2448 snapshot_output_destroy(sout);
2449 ret = LTTNG_OK;
2450
2451 error:
2452 rcu_read_unlock();
2453 return ret;
2454 }
2455
2456 /*
2457 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2458 *
2459 * If no output is available, outputs is untouched and 0 is returned.
2460 *
2461 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2462 */
2463 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2464 struct lttng_snapshot_output **outputs)
2465 {
2466 int ret, idx = 0;
2467 struct lttng_snapshot_output *list;
2468 struct lttng_ht_iter iter;
2469 struct snapshot_output *output;
2470
2471 assert(session);
2472 assert(outputs);
2473
2474 DBG("Cmd snapshot list outputs for session %s", session->name);
2475
2476 /*
2477 * Permission denied to create an output if the session is not
2478 * set in no output mode.
2479 */
2480 if (session->output_traces) {
2481 ret = LTTNG_ERR_EPERM;
2482 goto error;
2483 }
2484
2485 if (session->snapshot.nb_output == 0) {
2486 ret = 0;
2487 goto error;
2488 }
2489
2490 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2491 if (!list) {
2492 ret = LTTNG_ERR_NOMEM;
2493 goto error;
2494 }
2495
2496 /* Copy list from session to the new list object. */
2497 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2498 output, node.node) {
2499 assert(output->consumer);
2500 list[idx].id = output->id;
2501 list[idx].max_size = output->max_size;
2502 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2503 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2504 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2505 sizeof(list[idx].ctrl_url));
2506 } else {
2507 /* Control URI. */
2508 ret = uri_to_str_url(&output->consumer->dst.net.control,
2509 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2510 if (ret < 0) {
2511 ret = LTTNG_ERR_NOMEM;
2512 goto free_error;
2513 }
2514
2515 /* Data URI. */
2516 ret = uri_to_str_url(&output->consumer->dst.net.data,
2517 list[idx].data_url, sizeof(list[idx].data_url));
2518 if (ret < 0) {
2519 ret = LTTNG_ERR_NOMEM;
2520 goto free_error;
2521 }
2522 }
2523 idx++;
2524 }
2525
2526 *outputs = list;
2527 return session->snapshot.nb_output;
2528
2529 free_error:
2530 free(list);
2531 error:
2532 return -ret;
2533 }
2534
2535 /*
2536 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2537 * snapshot output is *not* set with a remote destination.
2538 *
2539 * Return 0 on success or a LTTNG_ERR code.
2540 */
2541 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2542 struct snapshot_output *snap_output, struct ltt_session *session)
2543 {
2544 int ret = LTTNG_OK;
2545 struct lttng_ht_iter iter;
2546 struct consumer_socket *socket;
2547
2548 assert(consumer);
2549 assert(snap_output);
2550 assert(session);
2551
2552 DBG2("Set relayd object from snapshot output");
2553
2554 /* Ignore if snapshot consumer output is not network. */
2555 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2556 goto error;
2557 }
2558
2559 /*
2560 * For each consumer socket, create and send the relayd object of the
2561 * snapshot output.
2562 */
2563 rcu_read_lock();
2564 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2565 socket, node.node) {
2566 ret = send_consumer_relayd_sockets(0, session->id,
2567 snap_output->consumer, socket);
2568 if (ret != LTTNG_OK) {
2569 rcu_read_unlock();
2570 goto error;
2571 }
2572 }
2573 rcu_read_unlock();
2574
2575 error:
2576 return ret;
2577 }
2578
2579 /*
2580 * Record a kernel snapshot.
2581 *
2582 * Return 0 on success or a LTTNG_ERR code.
2583 */
2584 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2585 struct snapshot_output *output, struct ltt_session *session,
2586 int wait, int nb_streams)
2587 {
2588 int ret;
2589
2590 assert(ksess);
2591 assert(output);
2592 assert(session);
2593
2594 /* Get the datetime for the snapshot output directory. */
2595 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2596 sizeof(output->datetime));
2597 if (!ret) {
2598 ret = LTTNG_ERR_INVALID;
2599 goto error;
2600 }
2601
2602 /*
2603 * Copy kernel session sockets so we can communicate with the right
2604 * consumer for the snapshot record command.
2605 */
2606 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2607 if (ret < 0) {
2608 ret = LTTNG_ERR_NOMEM;
2609 goto error;
2610 }
2611
2612 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2613 if (ret != LTTNG_OK) {
2614 goto error_snapshot;
2615 }
2616
2617 ret = kernel_snapshot_record(ksess, output, wait, nb_streams);
2618 if (ret != LTTNG_OK) {
2619 goto error_snapshot;
2620 }
2621
2622 ret = LTTNG_OK;
2623
2624 error_snapshot:
2625 /* Clean up copied sockets so this output can use some other later on. */
2626 consumer_destroy_output_sockets(output->consumer);
2627 error:
2628 return ret;
2629 }
2630
2631 /*
2632 * Record a UST snapshot.
2633 *
2634 * Return 0 on success or a LTTNG_ERR error code.
2635 */
2636 static int record_ust_snapshot(struct ltt_ust_session *usess,
2637 struct snapshot_output *output, struct ltt_session *session,
2638 int wait, int nb_streams)
2639 {
2640 int ret;
2641
2642 assert(usess);
2643 assert(output);
2644 assert(session);
2645
2646 /* Get the datetime for the snapshot output directory. */
2647 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2648 sizeof(output->datetime));
2649 if (!ret) {
2650 ret = LTTNG_ERR_INVALID;
2651 goto error;
2652 }
2653
2654 /*
2655 * Copy UST session sockets so we can communicate with the right
2656 * consumer for the snapshot record command.
2657 */
2658 ret = consumer_copy_sockets(output->consumer, usess->consumer);
2659 if (ret < 0) {
2660 ret = LTTNG_ERR_NOMEM;
2661 goto error;
2662 }
2663
2664 ret = set_relayd_for_snapshot(usess->consumer, output, session);
2665 if (ret != LTTNG_OK) {
2666 goto error_snapshot;
2667 }
2668
2669 ret = ust_app_snapshot_record(usess, output, wait, nb_streams);
2670 if (ret < 0) {
2671 switch (-ret) {
2672 case EINVAL:
2673 ret = LTTNG_ERR_INVALID;
2674 break;
2675 case ENODATA:
2676 ret = LTTNG_ERR_SNAPSHOT_NODATA;
2677 break;
2678 default:
2679 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2680 break;
2681 }
2682 goto error_snapshot;
2683 }
2684
2685 ret = LTTNG_OK;
2686
2687 error_snapshot:
2688 /* Clean up copied sockets so this output can use some other later on. */
2689 consumer_destroy_output_sockets(output->consumer);
2690 error:
2691 return ret;
2692 }
2693
2694 /*
2695 * Returns the total number of streams for a session or a negative value
2696 * on error.
2697 */
2698 static unsigned int get_total_nb_stream(struct ltt_session *session)
2699 {
2700 unsigned int total_streams = 0;
2701
2702 if (session->kernel_session) {
2703 struct ltt_kernel_session *ksess = session->kernel_session;
2704
2705 total_streams += ksess->stream_count_global;
2706 }
2707
2708 if (session->ust_session) {
2709 struct ltt_ust_session *usess = session->ust_session;
2710
2711 total_streams += ust_app_get_nb_stream(usess);
2712 }
2713
2714 return total_streams;
2715 }
2716
2717 /*
2718 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
2719 *
2720 * The wait parameter is ignored so this call always wait for the snapshot to
2721 * complete before returning.
2722 *
2723 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2724 */
2725 int cmd_snapshot_record(struct ltt_session *session,
2726 struct lttng_snapshot_output *output, int wait)
2727 {
2728 int ret = LTTNG_OK;
2729 unsigned int use_tmp_output = 0;
2730 struct snapshot_output tmp_output;
2731 unsigned int nb_streams, snapshot_success = 0;
2732
2733 assert(session);
2734
2735 DBG("Cmd snapshot record for session %s", session->name);
2736
2737 /*
2738 * Permission denied to create an output if the session is not
2739 * set in no output mode.
2740 */
2741 if (session->output_traces) {
2742 ret = LTTNG_ERR_EPERM;
2743 goto error;
2744 }
2745
2746 /* The session needs to be started at least once. */
2747 if (!session->started) {
2748 ret = LTTNG_ERR_START_SESSION_ONCE;
2749 goto error;
2750 }
2751
2752 /* Use temporary output for the session. */
2753 if (output && *output->ctrl_url != '\0') {
2754 ret = snapshot_output_init(output->max_size, output->name,
2755 output->ctrl_url, output->data_url, session->consumer,
2756 &tmp_output, NULL);
2757 if (ret < 0) {
2758 if (ret == -ENOMEM) {
2759 ret = LTTNG_ERR_NOMEM;
2760 } else {
2761 ret = LTTNG_ERR_INVALID;
2762 }
2763 goto error;
2764 }
2765 /* Use the global session count for the temporary snapshot. */
2766 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2767 use_tmp_output = 1;
2768 }
2769
2770 /*
2771 * Get the total number of stream of that session which is used by the
2772 * maximum size of the snapshot feature.
2773 */
2774 nb_streams = get_total_nb_stream(session);
2775
2776 if (session->kernel_session) {
2777 struct ltt_kernel_session *ksess = session->kernel_session;
2778
2779 if (use_tmp_output) {
2780 ret = record_kernel_snapshot(ksess, &tmp_output, session,
2781 wait, nb_streams);
2782 if (ret != LTTNG_OK) {
2783 goto error;
2784 }
2785 snapshot_success = 1;
2786 } else {
2787 struct snapshot_output *sout;
2788 struct lttng_ht_iter iter;
2789
2790 rcu_read_lock();
2791 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2792 &iter.iter, sout, node.node) {
2793 /*
2794 * Make a local copy of the output and assign the possible
2795 * temporary value given by the caller.
2796 */
2797 memset(&tmp_output, 0, sizeof(tmp_output));
2798 memcpy(&tmp_output, sout, sizeof(tmp_output));
2799
2800 /* Use temporary max size. */
2801 if (output->max_size != (uint64_t) -1ULL) {
2802 tmp_output.max_size = output->max_size;
2803 }
2804
2805 /* Use temporary name. */
2806 if (*output->name != '\0') {
2807 strncpy(tmp_output.name, output->name,
2808 sizeof(tmp_output.name));
2809 }
2810
2811 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2812
2813 ret = record_kernel_snapshot(ksess, &tmp_output,
2814 session, wait, nb_streams);
2815 if (ret != LTTNG_OK) {
2816 rcu_read_unlock();
2817 goto error;
2818 }
2819 snapshot_success = 1;
2820 }
2821 rcu_read_unlock();
2822 }
2823 }
2824
2825 if (session->ust_session) {
2826 struct ltt_ust_session *usess = session->ust_session;
2827
2828 if (use_tmp_output) {
2829 ret = record_ust_snapshot(usess, &tmp_output, session,
2830 wait, nb_streams);
2831 if (ret != LTTNG_OK) {
2832 goto error;
2833 }
2834 snapshot_success = 1;
2835 } else {
2836 struct snapshot_output *sout;
2837 struct lttng_ht_iter iter;
2838
2839 rcu_read_lock();
2840 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
2841 &iter.iter, sout, node.node) {
2842 /*
2843 * Make a local copy of the output and assign the possible
2844 * temporary value given by the caller.
2845 */
2846 memset(&tmp_output, 0, sizeof(tmp_output));
2847 memcpy(&tmp_output, sout, sizeof(tmp_output));
2848
2849 /* Use temporary max size. */
2850 if (output->max_size != (uint64_t) -1ULL) {
2851 tmp_output.max_size = output->max_size;
2852 }
2853
2854 /* Use temporary name. */
2855 if (*output->name != '\0') {
2856 strncpy(tmp_output.name, output->name,
2857 sizeof(tmp_output.name));
2858 }
2859
2860 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
2861
2862 ret = record_ust_snapshot(usess, &tmp_output, session,
2863 wait, nb_streams);
2864 if (ret != LTTNG_OK) {
2865 rcu_read_unlock();
2866 goto error;
2867 }
2868 snapshot_success = 1;
2869 }
2870 rcu_read_unlock();
2871 }
2872 }
2873
2874 if (snapshot_success) {
2875 session->snapshot.nb_snapshot++;
2876 } else {
2877 ret = LTTNG_ERR_SNAPSHOT_FAIL;
2878 }
2879
2880 error:
2881 return ret;
2882 }
2883
2884 /*
2885 * Init command subsystem.
2886 */
2887 void cmd_init(void)
2888 {
2889 /*
2890 * Set network sequence index to 1 for streams to match a relayd
2891 * socket on the consumer side.
2892 */
2893 pthread_mutex_lock(&relayd_net_seq_idx_lock);
2894 relayd_net_seq_idx = 1;
2895 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
2896
2897 DBG("Command subsystem initialized");
2898 }
LTTng 2.0 tools and control repository
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