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[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License, version 2 only, as
6 * published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 51
15 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #define _LGPL_SOURCE
20 #include <assert.h>
21 #include <string.h>
22 #include <inttypes.h>
23 #include <urcu/list.h>
24 #include <urcu/uatomic.h>
25
26 #include <common/defaults.h>
27 #include <common/common.h>
28 #include <common/sessiond-comm/sessiond-comm.h>
29 #include <common/relayd/relayd.h>
30 #include <common/utils.h>
31
32 #include "channel.h"
33 #include "consumer.h"
34 #include "event.h"
35 #include "health-sessiond.h"
36 #include "kernel.h"
37 #include "kernel-consumer.h"
38 #include "lttng-sessiond.h"
39 #include "utils.h"
40 #include "syscall.h"
41 #include "agent.h"
42
43 #include "cmd.h"
44
45 /*
46 * Used to keep a unique index for each relayd socket created where this value
47 * is associated with streams on the consumer so it can match the right relayd
48 * to send to. It must be accessed with the relayd_net_seq_idx_lock
49 * held.
50 */
51 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
52 static uint64_t relayd_net_seq_idx;
53
54 /*
55 * Create a session path used by list_lttng_sessions for the case that the
56 * session consumer is on the network.
57 */
58 static int build_network_session_path(char *dst, size_t size,
59 struct ltt_session *session)
60 {
61 int ret, kdata_port, udata_port;
62 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
63 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
64
65 assert(session);
66 assert(dst);
67
68 memset(tmp_urls, 0, sizeof(tmp_urls));
69 memset(tmp_uurl, 0, sizeof(tmp_uurl));
70
71 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
72
73 if (session->kernel_session && session->kernel_session->consumer) {
74 kuri = &session->kernel_session->consumer->dst.net.control;
75 kdata_port = session->kernel_session->consumer->dst.net.data.port;
76 }
77
78 if (session->ust_session && session->ust_session->consumer) {
79 uuri = &session->ust_session->consumer->dst.net.control;
80 udata_port = session->ust_session->consumer->dst.net.data.port;
81 }
82
83 if (uuri == NULL && kuri == NULL) {
84 uri = &session->consumer->dst.net.control;
85 kdata_port = session->consumer->dst.net.data.port;
86 } else if (kuri && uuri) {
87 ret = uri_compare(kuri, uuri);
88 if (ret) {
89 /* Not Equal */
90 uri = kuri;
91 /* Build uuri URL string */
92 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
93 if (ret < 0) {
94 goto error;
95 }
96 } else {
97 uri = kuri;
98 }
99 } else if (kuri && uuri == NULL) {
100 uri = kuri;
101 } else if (uuri && kuri == NULL) {
102 uri = uuri;
103 }
104
105 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
106 if (ret < 0) {
107 goto error;
108 }
109
110 /*
111 * Do we have a UST url set. If yes, this means we have both kernel and UST
112 * to print.
113 */
114 if (*tmp_uurl != '\0') {
115 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
116 tmp_urls, kdata_port, tmp_uurl, udata_port);
117 } else {
118 int dport;
119 if (kuri || (!kuri && !uuri)) {
120 dport = kdata_port;
121 } else {
122 /* No kernel URI, use the UST port. */
123 dport = udata_port;
124 }
125 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
126 }
127
128 error:
129 return ret;
130 }
131
132 /*
133 * Fill lttng_channel array of all channels.
134 */
135 static void list_lttng_channels(int domain, struct ltt_session *session,
136 struct lttng_channel *channels)
137 {
138 int i = 0;
139 struct ltt_kernel_channel *kchan;
140
141 DBG("Listing channels for session %s", session->name);
142
143 switch (domain) {
144 case LTTNG_DOMAIN_KERNEL:
145 /* Kernel channels */
146 if (session->kernel_session != NULL) {
147 cds_list_for_each_entry(kchan,
148 &session->kernel_session->channel_list.head, list) {
149 /* Copy lttng_channel struct to array */
150 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
151 channels[i].enabled = kchan->enabled;
152 i++;
153 }
154 }
155 break;
156 case LTTNG_DOMAIN_UST:
157 {
158 struct lttng_ht_iter iter;
159 struct ltt_ust_channel *uchan;
160
161 rcu_read_lock();
162 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
163 &iter.iter, uchan, node.node) {
164 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
165 channels[i].attr.overwrite = uchan->attr.overwrite;
166 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
167 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
168 channels[i].attr.switch_timer_interval =
169 uchan->attr.switch_timer_interval;
170 channels[i].attr.read_timer_interval =
171 uchan->attr.read_timer_interval;
172 channels[i].enabled = uchan->enabled;
173 channels[i].attr.tracefile_size = uchan->tracefile_size;
174 channels[i].attr.tracefile_count = uchan->tracefile_count;
175 switch (uchan->attr.output) {
176 case LTTNG_UST_MMAP:
177 default:
178 channels[i].attr.output = LTTNG_EVENT_MMAP;
179 break;
180 }
181 i++;
182 }
183 rcu_read_unlock();
184 break;
185 }
186 default:
187 break;
188 }
189 }
190
191 /*
192 * Create a list of agent domain events.
193 *
194 * Return number of events in list on success or else a negative value.
195 */
196 static int list_lttng_agent_events(struct agent *agt,
197 struct lttng_event **events)
198 {
199 int i = 0, ret = 0;
200 unsigned int nb_event = 0;
201 struct agent_event *event;
202 struct lttng_event *tmp_events;
203 struct lttng_ht_iter iter;
204
205 assert(agt);
206 assert(events);
207
208 DBG3("Listing agent events");
209
210 rcu_read_lock();
211 nb_event = lttng_ht_get_count(agt->events);
212 rcu_read_unlock();
213 if (nb_event == 0) {
214 ret = nb_event;
215 goto error;
216 }
217
218 tmp_events = zmalloc(nb_event * sizeof(*tmp_events));
219 if (!tmp_events) {
220 PERROR("zmalloc agent events session");
221 ret = -LTTNG_ERR_FATAL;
222 goto error;
223 }
224
225 rcu_read_lock();
226 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
227 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
228 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
229 tmp_events[i].enabled = event->enabled;
230 tmp_events[i].loglevel = event->loglevel;
231 tmp_events[i].loglevel_type = event->loglevel_type;
232 i++;
233 }
234 rcu_read_unlock();
235
236 *events = tmp_events;
237 ret = nb_event;
238
239 error:
240 assert(nb_event == i);
241 return ret;
242 }
243
244 /*
245 * Create a list of ust global domain events.
246 */
247 static int list_lttng_ust_global_events(char *channel_name,
248 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
249 {
250 int i = 0, ret = 0;
251 unsigned int nb_event = 0;
252 struct lttng_ht_iter iter;
253 struct lttng_ht_node_str *node;
254 struct ltt_ust_channel *uchan;
255 struct ltt_ust_event *uevent;
256 struct lttng_event *tmp;
257
258 DBG("Listing UST global events for channel %s", channel_name);
259
260 rcu_read_lock();
261
262 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
263 node = lttng_ht_iter_get_node_str(&iter);
264 if (node == NULL) {
265 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
266 goto error;
267 }
268
269 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
270
271 nb_event += lttng_ht_get_count(uchan->events);
272
273 if (nb_event == 0) {
274 ret = nb_event;
275 goto error;
276 }
277
278 DBG3("Listing UST global %d events", nb_event);
279
280 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
281 if (tmp == NULL) {
282 ret = LTTNG_ERR_FATAL;
283 goto error;
284 }
285
286 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
287 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
288 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
289 tmp[i].enabled = uevent->enabled;
290
291 switch (uevent->attr.instrumentation) {
292 case LTTNG_UST_TRACEPOINT:
293 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
294 break;
295 case LTTNG_UST_PROBE:
296 tmp[i].type = LTTNG_EVENT_PROBE;
297 break;
298 case LTTNG_UST_FUNCTION:
299 tmp[i].type = LTTNG_EVENT_FUNCTION;
300 break;
301 }
302
303 tmp[i].loglevel = uevent->attr.loglevel;
304 switch (uevent->attr.loglevel_type) {
305 case LTTNG_UST_LOGLEVEL_ALL:
306 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
307 break;
308 case LTTNG_UST_LOGLEVEL_RANGE:
309 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
310 break;
311 case LTTNG_UST_LOGLEVEL_SINGLE:
312 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
313 break;
314 }
315 if (uevent->filter) {
316 tmp[i].filter = 1;
317 }
318 if (uevent->exclusion) {
319 tmp[i].exclusion = 1;
320 }
321 i++;
322 }
323
324 ret = nb_event;
325 *events = tmp;
326
327 error:
328 rcu_read_unlock();
329 return ret;
330 }
331
332 /*
333 * Fill lttng_event array of all kernel events in the channel.
334 */
335 static int list_lttng_kernel_events(char *channel_name,
336 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
337 {
338 int i = 0, ret;
339 unsigned int nb_event;
340 struct ltt_kernel_event *event;
341 struct ltt_kernel_channel *kchan;
342
343 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
344 if (kchan == NULL) {
345 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
346 goto error;
347 }
348
349 nb_event = kchan->event_count;
350
351 DBG("Listing events for channel %s", kchan->channel->name);
352
353 if (nb_event == 0) {
354 *events = NULL;
355 goto syscall;
356 }
357
358 *events = zmalloc(nb_event * sizeof(struct lttng_event));
359 if (*events == NULL) {
360 ret = LTTNG_ERR_FATAL;
361 goto error;
362 }
363
364 /* Kernel channels */
365 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
366 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
367 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
368 (*events)[i].enabled = event->enabled;
369
370 switch (event->event->instrumentation) {
371 case LTTNG_KERNEL_TRACEPOINT:
372 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
373 break;
374 case LTTNG_KERNEL_KRETPROBE:
375 (*events)[i].type = LTTNG_EVENT_FUNCTION;
376 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
377 sizeof(struct lttng_kernel_kprobe));
378 break;
379 case LTTNG_KERNEL_KPROBE:
380 (*events)[i].type = LTTNG_EVENT_PROBE;
381 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
382 sizeof(struct lttng_kernel_kprobe));
383 break;
384 case LTTNG_KERNEL_FUNCTION:
385 (*events)[i].type = LTTNG_EVENT_FUNCTION;
386 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
387 sizeof(struct lttng_kernel_function));
388 break;
389 case LTTNG_KERNEL_NOOP:
390 (*events)[i].type = LTTNG_EVENT_NOOP;
391 break;
392 case LTTNG_KERNEL_SYSCALL:
393 (*events)[i].type = LTTNG_EVENT_SYSCALL;
394 break;
395 case LTTNG_KERNEL_ALL:
396 assert(0);
397 break;
398 }
399 i++;
400 }
401
402 syscall:
403 if (syscall_table) {
404 ssize_t new_size;
405
406 new_size = syscall_list_channel(kchan, events, nb_event);
407 if (new_size < 0) {
408 free(events);
409 ret = -new_size;
410 goto error;
411 }
412 nb_event = new_size;
413 }
414
415 return nb_event;
416
417 error:
418 /* Negate the error code to differentiate the size from an error */
419 return -ret;
420 }
421
422 /*
423 * Add URI so the consumer output object. Set the correct path depending on the
424 * domain adding the default trace directory.
425 */
426 static int add_uri_to_consumer(struct consumer_output *consumer,
427 struct lttng_uri *uri, int domain, const char *session_name)
428 {
429 int ret = LTTNG_OK;
430 const char *default_trace_dir;
431
432 assert(uri);
433
434 if (consumer == NULL) {
435 DBG("No consumer detected. Don't add URI. Stopping.");
436 ret = LTTNG_ERR_NO_CONSUMER;
437 goto error;
438 }
439
440 switch (domain) {
441 case LTTNG_DOMAIN_KERNEL:
442 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
443 break;
444 case LTTNG_DOMAIN_UST:
445 default_trace_dir = DEFAULT_UST_TRACE_DIR;
446 break;
447 default:
448 /*
449 * This case is possible is we try to add the URI to the global tracing
450 * session consumer object which in this case there is no subdir.
451 */
452 default_trace_dir = "";
453 }
454
455 switch (uri->dtype) {
456 case LTTNG_DST_IPV4:
457 case LTTNG_DST_IPV6:
458 DBG2("Setting network URI to consumer");
459
460 if (consumer->type == CONSUMER_DST_NET) {
461 if ((uri->stype == LTTNG_STREAM_CONTROL &&
462 consumer->dst.net.control_isset) ||
463 (uri->stype == LTTNG_STREAM_DATA &&
464 consumer->dst.net.data_isset)) {
465 ret = LTTNG_ERR_URL_EXIST;
466 goto error;
467 }
468 } else {
469 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
470 }
471
472 consumer->type = CONSUMER_DST_NET;
473
474 /* Set URI into consumer output object */
475 ret = consumer_set_network_uri(consumer, uri);
476 if (ret < 0) {
477 ret = -ret;
478 goto error;
479 } else if (ret == 1) {
480 /*
481 * URI was the same in the consumer so we do not append the subdir
482 * again so to not duplicate output dir.
483 */
484 ret = LTTNG_OK;
485 goto error;
486 }
487
488 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
489 ret = consumer_set_subdir(consumer, session_name);
490 if (ret < 0) {
491 ret = LTTNG_ERR_FATAL;
492 goto error;
493 }
494 }
495
496 if (uri->stype == LTTNG_STREAM_CONTROL) {
497 /* On a new subdir, reappend the default trace dir. */
498 strncat(consumer->subdir, default_trace_dir,
499 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
500 DBG3("Append domain trace name to subdir %s", consumer->subdir);
501 }
502
503 break;
504 case LTTNG_DST_PATH:
505 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
506 memset(consumer->dst.trace_path, 0,
507 sizeof(consumer->dst.trace_path));
508 strncpy(consumer->dst.trace_path, uri->dst.path,
509 sizeof(consumer->dst.trace_path));
510 /* Append default trace dir */
511 strncat(consumer->dst.trace_path, default_trace_dir,
512 sizeof(consumer->dst.trace_path) -
513 strlen(consumer->dst.trace_path) - 1);
514 /* Flag consumer as local. */
515 consumer->type = CONSUMER_DST_LOCAL;
516 break;
517 }
518
519 ret = LTTNG_OK;
520
521 error:
522 return ret;
523 }
524
525 /*
526 * Init tracing by creating trace directory and sending fds kernel consumer.
527 */
528 static int init_kernel_tracing(struct ltt_kernel_session *session)
529 {
530 int ret = 0;
531 struct lttng_ht_iter iter;
532 struct consumer_socket *socket;
533
534 assert(session);
535
536 rcu_read_lock();
537
538 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
539 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
540 socket, node.node) {
541 pthread_mutex_lock(socket->lock);
542 ret = kernel_consumer_send_session(socket, session);
543 pthread_mutex_unlock(socket->lock);
544 if (ret < 0) {
545 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
546 goto error;
547 }
548 }
549 }
550
551 error:
552 rcu_read_unlock();
553 return ret;
554 }
555
556 /*
557 * Create a socket to the relayd using the URI.
558 *
559 * On success, the relayd_sock pointer is set to the created socket.
560 * Else, it's stays untouched and a lttcomm error code is returned.
561 */
562 static int create_connect_relayd(struct lttng_uri *uri,
563 struct lttcomm_relayd_sock **relayd_sock)
564 {
565 int ret;
566 struct lttcomm_relayd_sock *rsock;
567
568 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
569 RELAYD_VERSION_COMM_MINOR);
570 if (!rsock) {
571 ret = LTTNG_ERR_FATAL;
572 goto error;
573 }
574
575 /*
576 * Connect to relayd so we can proceed with a session creation. This call
577 * can possibly block for an arbitrary amount of time to set the health
578 * state to be in poll execution.
579 */
580 health_poll_entry();
581 ret = relayd_connect(rsock);
582 health_poll_exit();
583 if (ret < 0) {
584 ERR("Unable to reach lttng-relayd");
585 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
586 goto free_sock;
587 }
588
589 /* Create socket for control stream. */
590 if (uri->stype == LTTNG_STREAM_CONTROL) {
591 DBG3("Creating relayd stream socket from URI");
592
593 /* Check relayd version */
594 ret = relayd_version_check(rsock);
595 if (ret < 0) {
596 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
597 goto close_sock;
598 }
599 } else if (uri->stype == LTTNG_STREAM_DATA) {
600 DBG3("Creating relayd data socket from URI");
601 } else {
602 /* Command is not valid */
603 ERR("Relayd invalid stream type: %d", uri->stype);
604 ret = LTTNG_ERR_INVALID;
605 goto close_sock;
606 }
607
608 *relayd_sock = rsock;
609
610 return LTTNG_OK;
611
612 close_sock:
613 /* The returned value is not useful since we are on an error path. */
614 (void) relayd_close(rsock);
615 free_sock:
616 free(rsock);
617 error:
618 return ret;
619 }
620
621 /*
622 * Connect to the relayd using URI and send the socket to the right consumer.
623 */
624 static int send_consumer_relayd_socket(int domain, unsigned int session_id,
625 struct lttng_uri *relayd_uri, struct consumer_output *consumer,
626 struct consumer_socket *consumer_sock,
627 char *session_name, char *hostname, int session_live_timer)
628 {
629 int ret;
630 struct lttcomm_relayd_sock *rsock = NULL;
631
632 /* Connect to relayd and make version check if uri is the control. */
633 ret = create_connect_relayd(relayd_uri, &rsock);
634 if (ret != LTTNG_OK) {
635 goto error;
636 }
637 assert(rsock);
638
639 /* Set the network sequence index if not set. */
640 if (consumer->net_seq_index == (uint64_t) -1ULL) {
641 pthread_mutex_lock(&relayd_net_seq_idx_lock);
642 /*
643 * Increment net_seq_idx because we are about to transfer the
644 * new relayd socket to the consumer.
645 * Assign unique key so the consumer can match streams.
646 */
647 consumer->net_seq_index = ++relayd_net_seq_idx;
648 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
649 }
650
651 /* Send relayd socket to consumer. */
652 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
653 relayd_uri->stype, session_id,
654 session_name, hostname, session_live_timer);
655 if (ret < 0) {
656 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
657 goto close_sock;
658 }
659
660 /* Flag that the corresponding socket was sent. */
661 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
662 consumer_sock->control_sock_sent = 1;
663 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
664 consumer_sock->data_sock_sent = 1;
665 }
666
667 ret = LTTNG_OK;
668
669 /*
670 * Close socket which was dup on the consumer side. The session daemon does
671 * NOT keep track of the relayd socket(s) once transfer to the consumer.
672 */
673
674 close_sock:
675 (void) relayd_close(rsock);
676 free(rsock);
677
678 error:
679 if (ret != LTTNG_OK) {
680 /*
681 * The consumer output for this session should not be used anymore
682 * since the relayd connection failed thus making any tracing or/and
683 * streaming not usable.
684 */
685 consumer->enabled = 0;
686 }
687 return ret;
688 }
689
690 /*
691 * Send both relayd sockets to a specific consumer and domain. This is a
692 * helper function to facilitate sending the information to the consumer for a
693 * session.
694 */
695 static int send_consumer_relayd_sockets(int domain, unsigned int session_id,
696 struct consumer_output *consumer, struct consumer_socket *sock,
697 char *session_name, char *hostname, int session_live_timer)
698 {
699 int ret = LTTNG_OK;
700
701 assert(consumer);
702 assert(sock);
703
704 /* Sending control relayd socket. */
705 if (!sock->control_sock_sent) {
706 ret = send_consumer_relayd_socket(domain, session_id,
707 &consumer->dst.net.control, consumer, sock,
708 session_name, hostname, session_live_timer);
709 if (ret != LTTNG_OK) {
710 goto error;
711 }
712 }
713
714 /* Sending data relayd socket. */
715 if (!sock->data_sock_sent) {
716 ret = send_consumer_relayd_socket(domain, session_id,
717 &consumer->dst.net.data, consumer, sock,
718 session_name, hostname, session_live_timer);
719 if (ret != LTTNG_OK) {
720 goto error;
721 }
722 }
723
724 error:
725 return ret;
726 }
727
728 /*
729 * Setup relayd connections for a tracing session. First creates the socket to
730 * the relayd and send them to the right domain consumer. Consumer type MUST be
731 * network.
732 */
733 int cmd_setup_relayd(struct ltt_session *session)
734 {
735 int ret = LTTNG_OK;
736 struct ltt_ust_session *usess;
737 struct ltt_kernel_session *ksess;
738 struct consumer_socket *socket;
739 struct lttng_ht_iter iter;
740
741 assert(session);
742
743 usess = session->ust_session;
744 ksess = session->kernel_session;
745
746 DBG("Setting relayd for session %s", session->name);
747
748 rcu_read_lock();
749
750 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
751 && usess->consumer->enabled) {
752 /* For each consumer socket, send relayd sockets */
753 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
754 socket, node.node) {
755 pthread_mutex_lock(socket->lock);
756 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
757 usess->consumer, socket,
758 session->name, session->hostname,
759 session->live_timer);
760 pthread_mutex_unlock(socket->lock);
761 if (ret != LTTNG_OK) {
762 goto error;
763 }
764 /* Session is now ready for network streaming. */
765 session->net_handle = 1;
766 }
767 }
768
769 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
770 && ksess->consumer->enabled) {
771 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
772 socket, node.node) {
773 pthread_mutex_lock(socket->lock);
774 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
775 ksess->consumer, socket,
776 session->name, session->hostname,
777 session->live_timer);
778 pthread_mutex_unlock(socket->lock);
779 if (ret != LTTNG_OK) {
780 goto error;
781 }
782 /* Session is now ready for network streaming. */
783 session->net_handle = 1;
784 }
785 }
786
787 error:
788 rcu_read_unlock();
789 return ret;
790 }
791
792 /*
793 * Start a kernel session by opening all necessary streams.
794 */
795 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
796 {
797 int ret;
798 struct ltt_kernel_channel *kchan;
799
800 /* Open kernel metadata */
801 if (ksess->metadata == NULL && ksess->output_traces) {
802 ret = kernel_open_metadata(ksess);
803 if (ret < 0) {
804 ret = LTTNG_ERR_KERN_META_FAIL;
805 goto error;
806 }
807 }
808
809 /* Open kernel metadata stream */
810 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
811 ret = kernel_open_metadata_stream(ksess);
812 if (ret < 0) {
813 ERR("Kernel create metadata stream failed");
814 ret = LTTNG_ERR_KERN_STREAM_FAIL;
815 goto error;
816 }
817 }
818
819 /* For each channel */
820 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
821 if (kchan->stream_count == 0) {
822 ret = kernel_open_channel_stream(kchan);
823 if (ret < 0) {
824 ret = LTTNG_ERR_KERN_STREAM_FAIL;
825 goto error;
826 }
827 /* Update the stream global counter */
828 ksess->stream_count_global += ret;
829 }
830 }
831
832 /* Setup kernel consumer socket and send fds to it */
833 ret = init_kernel_tracing(ksess);
834 if (ret != 0) {
835 ret = LTTNG_ERR_KERN_START_FAIL;
836 goto error;
837 }
838
839 /* This start the kernel tracing */
840 ret = kernel_start_session(ksess);
841 if (ret < 0) {
842 ret = LTTNG_ERR_KERN_START_FAIL;
843 goto error;
844 }
845
846 /* Quiescent wait after starting trace */
847 kernel_wait_quiescent(kernel_tracer_fd);
848
849 ksess->active = 1;
850
851 ret = LTTNG_OK;
852
853 error:
854 return ret;
855 }
856
857 /*
858 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
859 */
860 int cmd_disable_channel(struct ltt_session *session, int domain,
861 char *channel_name)
862 {
863 int ret;
864 struct ltt_ust_session *usess;
865
866 usess = session->ust_session;
867
868 rcu_read_lock();
869
870 switch (domain) {
871 case LTTNG_DOMAIN_KERNEL:
872 {
873 ret = channel_kernel_disable(session->kernel_session,
874 channel_name);
875 if (ret != LTTNG_OK) {
876 goto error;
877 }
878
879 kernel_wait_quiescent(kernel_tracer_fd);
880 break;
881 }
882 case LTTNG_DOMAIN_UST:
883 {
884 struct ltt_ust_channel *uchan;
885 struct lttng_ht *chan_ht;
886
887 chan_ht = usess->domain_global.channels;
888
889 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
890 if (uchan == NULL) {
891 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
892 goto error;
893 }
894
895 ret = channel_ust_disable(usess, uchan);
896 if (ret != LTTNG_OK) {
897 goto error;
898 }
899 break;
900 }
901 default:
902 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
903 goto error;
904 }
905
906 ret = LTTNG_OK;
907
908 error:
909 rcu_read_unlock();
910 return ret;
911 }
912
913 /*
914 * Command LTTNG_TRACK_PID processed by the client thread.
915 *
916 * Called with session lock held.
917 */
918 int cmd_track_pid(struct ltt_session *session, int domain, int pid)
919 {
920 int ret;
921
922 rcu_read_lock();
923
924 switch (domain) {
925 case LTTNG_DOMAIN_KERNEL:
926 {
927 struct ltt_kernel_session *ksess;
928
929 ksess = session->kernel_session;
930
931 ret = kernel_track_pid(ksess, pid);
932 if (ret != LTTNG_OK) {
933 goto error;
934 }
935
936 kernel_wait_quiescent(kernel_tracer_fd);
937 break;
938 }
939 case LTTNG_DOMAIN_UST:
940 {
941 struct ltt_ust_session *usess;
942
943 usess = session->ust_session;
944
945 ret = trace_ust_track_pid(usess, pid);
946 if (ret != LTTNG_OK) {
947 goto error;
948 }
949 break;
950 }
951 default:
952 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
953 goto error;
954 }
955
956 ret = LTTNG_OK;
957
958 error:
959 rcu_read_unlock();
960 return ret;
961 }
962
963 /*
964 * Command LTTNG_UNTRACK_PID processed by the client thread.
965 *
966 * Called with session lock held.
967 */
968 int cmd_untrack_pid(struct ltt_session *session, int domain, int pid)
969 {
970 int ret;
971
972 rcu_read_lock();
973
974 switch (domain) {
975 case LTTNG_DOMAIN_KERNEL:
976 {
977 struct ltt_kernel_session *ksess;
978
979 ksess = session->kernel_session;
980
981 ret = kernel_untrack_pid(ksess, pid);
982 if (ret != LTTNG_OK) {
983 goto error;
984 }
985
986 kernel_wait_quiescent(kernel_tracer_fd);
987 break;
988 }
989 case LTTNG_DOMAIN_UST:
990 {
991 struct ltt_ust_session *usess;
992
993 usess = session->ust_session;
994
995 ret = trace_ust_untrack_pid(usess, pid);
996 if (ret != LTTNG_OK) {
997 goto error;
998 }
999 break;
1000 }
1001 default:
1002 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1003 goto error;
1004 }
1005
1006 ret = LTTNG_OK;
1007
1008 error:
1009 rcu_read_unlock();
1010 return ret;
1011 }
1012
1013 /*
1014 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1015 *
1016 * The wpipe arguments is used as a notifier for the kernel thread.
1017 */
1018 int cmd_enable_channel(struct ltt_session *session,
1019 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
1020 {
1021 int ret;
1022 struct ltt_ust_session *usess = session->ust_session;
1023 struct lttng_ht *chan_ht;
1024 size_t len;
1025
1026 assert(session);
1027 assert(attr);
1028 assert(domain);
1029
1030 len = strnlen(attr->name, sizeof(attr->name));
1031
1032 /* Validate channel name */
1033 if (attr->name[0] == '.' ||
1034 memchr(attr->name, '/', len) != NULL) {
1035 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1036 goto end;
1037 }
1038
1039 DBG("Enabling channel %s for session %s", attr->name, session->name);
1040
1041 rcu_read_lock();
1042
1043 /*
1044 * Don't try to enable a channel if the session has been started at
1045 * some point in time before. The tracer does not allow it.
1046 */
1047 if (session->has_been_started) {
1048 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1049 goto error;
1050 }
1051
1052 /*
1053 * If the session is a live session, remove the switch timer, the
1054 * live timer does the same thing but sends also synchronisation
1055 * beacons for inactive streams.
1056 */
1057 if (session->live_timer > 0) {
1058 attr->attr.live_timer_interval = session->live_timer;
1059 attr->attr.switch_timer_interval = 0;
1060 }
1061
1062 /*
1063 * The ringbuffer (both in user space and kernel) behave badly in overwrite
1064 * mode and with less than 2 subbuf so block it right away and send back an
1065 * invalid attribute error.
1066 */
1067 if (attr->attr.overwrite && attr->attr.num_subbuf < 2) {
1068 ret = LTTNG_ERR_INVALID;
1069 goto error;
1070 }
1071
1072 switch (domain->type) {
1073 case LTTNG_DOMAIN_KERNEL:
1074 {
1075 struct ltt_kernel_channel *kchan;
1076
1077 kchan = trace_kernel_get_channel_by_name(attr->name,
1078 session->kernel_session);
1079 if (kchan == NULL) {
1080 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
1081 if (attr->name[0] != '\0') {
1082 session->kernel_session->has_non_default_channel = 1;
1083 }
1084 } else {
1085 ret = channel_kernel_enable(session->kernel_session, kchan);
1086 }
1087
1088 if (ret != LTTNG_OK) {
1089 goto error;
1090 }
1091
1092 kernel_wait_quiescent(kernel_tracer_fd);
1093 break;
1094 }
1095 case LTTNG_DOMAIN_UST:
1096 {
1097 struct ltt_ust_channel *uchan;
1098
1099 chan_ht = usess->domain_global.channels;
1100
1101 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1102 if (uchan == NULL) {
1103 ret = channel_ust_create(usess, attr, domain->buf_type);
1104 if (attr->name[0] != '\0') {
1105 usess->has_non_default_channel = 1;
1106 }
1107 } else {
1108 ret = channel_ust_enable(usess, uchan);
1109 }
1110 break;
1111 }
1112 default:
1113 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1114 goto error;
1115 }
1116
1117 error:
1118 rcu_read_unlock();
1119 end:
1120 return ret;
1121 }
1122
1123 /*
1124 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1125 */
1126 int cmd_disable_event(struct ltt_session *session, int domain,
1127 char *channel_name,
1128 struct lttng_event *event)
1129 {
1130 int ret;
1131 char *event_name;
1132
1133 DBG("Disable event command for event \'%s\'", event->name);
1134
1135 event_name = event->name;
1136
1137 /* Error out on unhandled search criteria */
1138 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1139 || event->pid || event->filter || event->exclusion) {
1140 return LTTNG_ERR_UNK;
1141 }
1142
1143 rcu_read_lock();
1144
1145 switch (domain) {
1146 case LTTNG_DOMAIN_KERNEL:
1147 {
1148 struct ltt_kernel_channel *kchan;
1149 struct ltt_kernel_session *ksess;
1150
1151 ksess = session->kernel_session;
1152
1153 /*
1154 * If a non-default channel has been created in the
1155 * session, explicitely require that -c chan_name needs
1156 * to be provided.
1157 */
1158 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1159 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1160 goto error;
1161 }
1162
1163 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1164 if (kchan == NULL) {
1165 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1166 goto error;
1167 }
1168
1169 switch (event->type) {
1170 case LTTNG_EVENT_ALL:
1171 ret = event_kernel_disable_event_all(kchan);
1172 if (ret != LTTNG_OK) {
1173 goto error;
1174 }
1175 break;
1176 case LTTNG_EVENT_TRACEPOINT: /* fall-through */
1177 case LTTNG_EVENT_SYSCALL:
1178 if (!strcmp(event_name, "*")) {
1179 ret = event_kernel_disable_event_type(kchan,
1180 event->type);
1181 } else {
1182 ret = event_kernel_disable_event(kchan,
1183 event_name);
1184 }
1185 if (ret != LTTNG_OK) {
1186 goto error;
1187 }
1188 break;
1189 case LTTNG_EVENT_PROBE:
1190 case LTTNG_EVENT_FUNCTION:
1191 case LTTNG_EVENT_FUNCTION_ENTRY:
1192 ret = event_kernel_disable_event(kchan, event_name);
1193 if (ret != LTTNG_OK) {
1194 goto error;
1195 }
1196 break;
1197 default:
1198 ret = LTTNG_ERR_UNK;
1199 goto error;
1200 }
1201
1202 kernel_wait_quiescent(kernel_tracer_fd);
1203 break;
1204 }
1205 case LTTNG_DOMAIN_UST:
1206 {
1207 struct ltt_ust_channel *uchan;
1208 struct ltt_ust_session *usess;
1209
1210 usess = session->ust_session;
1211
1212 /*
1213 * If a non-default channel has been created in the
1214 * session, explicitely require that -c chan_name needs
1215 * to be provided.
1216 */
1217 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1218 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1219 goto error;
1220 }
1221
1222 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1223 channel_name);
1224 if (uchan == NULL) {
1225 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1226 goto error;
1227 }
1228
1229 switch (event->type) {
1230 case LTTNG_EVENT_ALL:
1231 ret = event_ust_disable_tracepoint(usess, uchan, event_name);
1232 if (ret != LTTNG_OK) {
1233 goto error;
1234 }
1235 break;
1236 default:
1237 ret = LTTNG_ERR_UNK;
1238 goto error;
1239 }
1240
1241 DBG3("Disable UST event %s in channel %s completed", event_name,
1242 channel_name);
1243 break;
1244 }
1245 case LTTNG_DOMAIN_LOG4J:
1246 case LTTNG_DOMAIN_JUL:
1247 case LTTNG_DOMAIN_PYTHON:
1248 {
1249 struct agent *agt;
1250 struct ltt_ust_session *usess = session->ust_session;
1251
1252 assert(usess);
1253
1254 switch (event->type) {
1255 case LTTNG_EVENT_ALL:
1256 break;
1257 default:
1258 ret = LTTNG_ERR_UNK;
1259 goto error;
1260 }
1261
1262 agt = trace_ust_find_agent(usess, domain);
1263 if (!agt) {
1264 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1265 goto error;
1266 }
1267 /* The wild card * means that everything should be disabled. */
1268 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1269 ret = event_agent_disable_all(usess, agt);
1270 } else {
1271 ret = event_agent_disable(usess, agt, event_name);
1272 }
1273 if (ret != LTTNG_OK) {
1274 goto error;
1275 }
1276
1277 break;
1278 }
1279 default:
1280 ret = LTTNG_ERR_UND;
1281 goto error;
1282 }
1283
1284 ret = LTTNG_OK;
1285
1286 error:
1287 rcu_read_unlock();
1288 return ret;
1289 }
1290
1291 /*
1292 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1293 */
1294 int cmd_add_context(struct ltt_session *session, int domain,
1295 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1296 {
1297 int ret, chan_kern_created = 0, chan_ust_created = 0;
1298
1299 switch (domain) {
1300 case LTTNG_DOMAIN_KERNEL:
1301 assert(session->kernel_session);
1302
1303 if (session->kernel_session->channel_count == 0) {
1304 /* Create default channel */
1305 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1306 if (ret != LTTNG_OK) {
1307 goto error;
1308 }
1309 chan_kern_created = 1;
1310 }
1311 /* Add kernel context to kernel tracer */
1312 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1313 if (ret != LTTNG_OK) {
1314 goto error;
1315 }
1316 break;
1317 case LTTNG_DOMAIN_UST:
1318 {
1319 struct ltt_ust_session *usess = session->ust_session;
1320 unsigned int chan_count;
1321
1322 assert(usess);
1323
1324 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1325 if (chan_count == 0) {
1326 struct lttng_channel *attr;
1327 /* Create default channel */
1328 attr = channel_new_default_attr(domain, usess->buffer_type);
1329 if (attr == NULL) {
1330 ret = LTTNG_ERR_FATAL;
1331 goto error;
1332 }
1333
1334 ret = channel_ust_create(usess, attr, usess->buffer_type);
1335 if (ret != LTTNG_OK) {
1336 free(attr);
1337 goto error;
1338 }
1339 free(attr);
1340 chan_ust_created = 1;
1341 }
1342
1343 ret = context_ust_add(usess, domain, ctx, channel_name);
1344 if (ret != LTTNG_OK) {
1345 goto error;
1346 }
1347 break;
1348 }
1349 default:
1350 ret = LTTNG_ERR_UND;
1351 goto error;
1352 }
1353
1354 return LTTNG_OK;
1355
1356 error:
1357 if (chan_kern_created) {
1358 struct ltt_kernel_channel *kchan =
1359 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1360 session->kernel_session);
1361 /* Created previously, this should NOT fail. */
1362 assert(kchan);
1363 kernel_destroy_channel(kchan);
1364 }
1365
1366 if (chan_ust_created) {
1367 struct ltt_ust_channel *uchan =
1368 trace_ust_find_channel_by_name(
1369 session->ust_session->domain_global.channels,
1370 DEFAULT_CHANNEL_NAME);
1371 /* Created previously, this should NOT fail. */
1372 assert(uchan);
1373 /* Remove from the channel list of the session. */
1374 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1375 uchan);
1376 trace_ust_destroy_channel(uchan);
1377 }
1378 return ret;
1379 }
1380
1381 static int validate_event_name(const char *name)
1382 {
1383 int ret = 0;
1384 const char *c = name;
1385 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1386 bool null_terminated = false;
1387
1388 /*
1389 * Make sure that unescaped wildcards are only used as the last
1390 * character of the event name.
1391 */
1392 while (c < event_name_end) {
1393 switch (*c) {
1394 case '\0':
1395 null_terminated = true;
1396 goto end;
1397 case '\\':
1398 c++;
1399 break;
1400 case '*':
1401 if ((c + 1) < event_name_end && *(c + 1)) {
1402 /* Wildcard is not the last character */
1403 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1404 goto end;
1405 }
1406 default:
1407 break;
1408 }
1409 c++;
1410 }
1411 end:
1412 if (!ret && !null_terminated) {
1413 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1414 }
1415 return ret;
1416 }
1417
1418 /*
1419 * Command LTTNG_ENABLE_EVENT processed by the client thread.
1420 * We own filter, exclusion, and filter_expression.
1421 */
1422 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
1423 char *channel_name, struct lttng_event *event,
1424 char *filter_expression,
1425 struct lttng_filter_bytecode *filter,
1426 struct lttng_event_exclusion *exclusion,
1427 int wpipe)
1428 {
1429 int ret, channel_created = 0;
1430 struct lttng_channel *attr;
1431
1432 assert(session);
1433 assert(event);
1434 assert(channel_name);
1435
1436 DBG("Enable event command for event \'%s\'", event->name);
1437
1438 ret = validate_event_name(event->name);
1439 if (ret) {
1440 goto error;
1441 }
1442
1443 rcu_read_lock();
1444
1445 switch (domain->type) {
1446 case LTTNG_DOMAIN_KERNEL:
1447 {
1448 struct ltt_kernel_channel *kchan;
1449
1450 /*
1451 * If a non-default channel has been created in the
1452 * session, explicitely require that -c chan_name needs
1453 * to be provided.
1454 */
1455 if (session->kernel_session->has_non_default_channel
1456 && channel_name[0] == '\0') {
1457 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1458 goto error;
1459 }
1460
1461 kchan = trace_kernel_get_channel_by_name(channel_name,
1462 session->kernel_session);
1463 if (kchan == NULL) {
1464 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1465 LTTNG_BUFFER_GLOBAL);
1466 if (attr == NULL) {
1467 ret = LTTNG_ERR_FATAL;
1468 goto error;
1469 }
1470 strncpy(attr->name, channel_name, sizeof(attr->name));
1471
1472 ret = cmd_enable_channel(session, domain, attr, wpipe);
1473 if (ret != LTTNG_OK) {
1474 free(attr);
1475 goto error;
1476 }
1477 free(attr);
1478
1479 channel_created = 1;
1480 }
1481
1482 /* Get the newly created kernel channel pointer */
1483 kchan = trace_kernel_get_channel_by_name(channel_name,
1484 session->kernel_session);
1485 if (kchan == NULL) {
1486 /* This sould not happen... */
1487 ret = LTTNG_ERR_FATAL;
1488 goto error;
1489 }
1490
1491 switch (event->type) {
1492 case LTTNG_EVENT_ALL:
1493 {
1494 char *filter_expression_a = NULL;
1495 struct lttng_filter_bytecode *filter_a = NULL;
1496
1497 /*
1498 * We need to duplicate filter_expression and filter,
1499 * because ownership is passed to first enable
1500 * event.
1501 */
1502 if (filter_expression) {
1503 filter_expression_a = strdup(filter_expression);
1504 if (!filter_expression_a) {
1505 ret = LTTNG_ERR_FATAL;
1506 goto error;
1507 }
1508 }
1509 if (filter) {
1510 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1511 if (!filter_a) {
1512 free(filter_expression_a);
1513 ret = LTTNG_ERR_FATAL;
1514 goto error;
1515 }
1516 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1517 }
1518 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
1519 ret = event_kernel_enable_event(kchan, event,
1520 filter_expression, filter);
1521 /* We have passed ownership */
1522 filter_expression = NULL;
1523 filter = NULL;
1524 if (ret != LTTNG_OK) {
1525 if (channel_created) {
1526 /* Let's not leak a useless channel. */
1527 kernel_destroy_channel(kchan);
1528 }
1529 free(filter_expression_a);
1530 free(filter_a);
1531 goto error;
1532 }
1533 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
1534 ret = event_kernel_enable_event(kchan, event,
1535 filter_expression_a, filter_a);
1536 if (ret != LTTNG_OK) {
1537 free(filter_expression_a);
1538 free(filter_a);
1539 goto error;
1540 }
1541 break;
1542 }
1543 case LTTNG_EVENT_PROBE:
1544 case LTTNG_EVENT_FUNCTION:
1545 case LTTNG_EVENT_FUNCTION_ENTRY:
1546 case LTTNG_EVENT_TRACEPOINT:
1547 ret = event_kernel_enable_event(kchan, event,
1548 filter_expression, filter);
1549 /* We have passed ownership */
1550 filter_expression = NULL;
1551 filter = NULL;
1552 if (ret != LTTNG_OK) {
1553 if (channel_created) {
1554 /* Let's not leak a useless channel. */
1555 kernel_destroy_channel(kchan);
1556 }
1557 goto error;
1558 }
1559 break;
1560 case LTTNG_EVENT_SYSCALL:
1561 ret = event_kernel_enable_event(kchan, event,
1562 filter_expression, filter);
1563 /* We have passed ownership */
1564 filter_expression = NULL;
1565 filter = NULL;
1566 if (ret != LTTNG_OK) {
1567 goto error;
1568 }
1569 break;
1570 default:
1571 ret = LTTNG_ERR_UNK;
1572 goto error;
1573 }
1574
1575 kernel_wait_quiescent(kernel_tracer_fd);
1576 break;
1577 }
1578 case LTTNG_DOMAIN_UST:
1579 {
1580 struct ltt_ust_channel *uchan;
1581 struct ltt_ust_session *usess = session->ust_session;
1582
1583 assert(usess);
1584
1585 /*
1586 * If a non-default channel has been created in the
1587 * session, explicitely require that -c chan_name needs
1588 * to be provided.
1589 */
1590 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1591 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1592 goto error;
1593 }
1594
1595 /* Get channel from global UST domain */
1596 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1597 channel_name);
1598 if (uchan == NULL) {
1599 /* Create default channel */
1600 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1601 usess->buffer_type);
1602 if (attr == NULL) {
1603 ret = LTTNG_ERR_FATAL;
1604 goto error;
1605 }
1606 strncpy(attr->name, channel_name, sizeof(attr->name));
1607
1608 ret = cmd_enable_channel(session, domain, attr, wpipe);
1609 if (ret != LTTNG_OK) {
1610 free(attr);
1611 goto error;
1612 }
1613 free(attr);
1614
1615 /* Get the newly created channel reference back */
1616 uchan = trace_ust_find_channel_by_name(
1617 usess->domain_global.channels, channel_name);
1618 assert(uchan);
1619 }
1620
1621 /* At this point, the session and channel exist on the tracer */
1622 ret = event_ust_enable_tracepoint(usess, uchan, event,
1623 filter_expression, filter, exclusion);
1624 /* We have passed ownership */
1625 filter_expression = NULL;
1626 filter = NULL;
1627 exclusion = NULL;
1628 if (ret != LTTNG_OK) {
1629 goto error;
1630 }
1631 break;
1632 }
1633 case LTTNG_DOMAIN_LOG4J:
1634 case LTTNG_DOMAIN_JUL:
1635 case LTTNG_DOMAIN_PYTHON:
1636 {
1637 const char *default_event_name, *default_chan_name;
1638 struct agent *agt;
1639 struct lttng_event uevent;
1640 struct lttng_domain tmp_dom;
1641 struct ltt_ust_session *usess = session->ust_session;
1642
1643 assert(usess);
1644
1645 agt = trace_ust_find_agent(usess, domain->type);
1646 if (!agt) {
1647 agt = agent_create(domain->type);
1648 if (!agt) {
1649 ret = -LTTNG_ERR_NOMEM;
1650 goto error;
1651 }
1652 agent_add(agt, usess->agents);
1653 }
1654
1655 /* Create the default tracepoint. */
1656 memset(&uevent, 0, sizeof(uevent));
1657 uevent.type = LTTNG_EVENT_TRACEPOINT;
1658 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1659 default_event_name = event_get_default_agent_ust_name(domain->type);
1660 if (!default_event_name) {
1661 ret = -LTTNG_ERR_FATAL;
1662 goto error;
1663 }
1664 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1665 uevent.name[sizeof(uevent.name) - 1] = '\0';
1666
1667 /*
1668 * The domain type is changed because we are about to enable the
1669 * default channel and event for the JUL domain that are hardcoded.
1670 * This happens in the UST domain.
1671 */
1672 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1673 tmp_dom.type = LTTNG_DOMAIN_UST;
1674
1675 switch (domain->type) {
1676 case LTTNG_DOMAIN_LOG4J:
1677 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1678 break;
1679 case LTTNG_DOMAIN_JUL:
1680 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1681 break;
1682 case LTTNG_DOMAIN_PYTHON:
1683 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1684 break;
1685 default:
1686 /* The switch/case we are in should avoid this else big problem */
1687 assert(0);
1688 }
1689
1690 {
1691 struct lttng_filter_bytecode *filter_copy = NULL;
1692
1693 if (filter) {
1694 filter_copy = zmalloc(
1695 sizeof(struct lttng_filter_bytecode)
1696 + filter->len);
1697 if (!filter_copy) {
1698 goto error;
1699 }
1700
1701 memcpy(filter_copy, filter,
1702 sizeof(struct lttng_filter_bytecode)
1703 + filter->len);
1704 }
1705
1706 ret = cmd_enable_event(session, &tmp_dom,
1707 (char *) default_chan_name,
1708 &uevent, filter_expression, filter_copy,
1709 NULL, wpipe);
1710 /* We have passed ownership */
1711 filter_expression = NULL;
1712 }
1713
1714 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1715 goto error;
1716 }
1717
1718 /* The wild card * means that everything should be enabled. */
1719 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1720 ret = event_agent_enable_all(usess, agt, event, filter);
1721 filter = NULL;
1722 } else {
1723 ret = event_agent_enable(usess, agt, event, filter);
1724 filter = NULL;
1725 }
1726 if (ret != LTTNG_OK) {
1727 goto error;
1728 }
1729
1730 break;
1731 }
1732 default:
1733 ret = LTTNG_ERR_UND;
1734 goto error;
1735 }
1736
1737 ret = LTTNG_OK;
1738
1739 error:
1740 free(filter_expression);
1741 free(filter);
1742 free(exclusion);
1743 rcu_read_unlock();
1744 return ret;
1745 }
1746
1747 /*
1748 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1749 */
1750 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1751 {
1752 int ret;
1753 ssize_t nb_events = 0;
1754
1755 switch (domain) {
1756 case LTTNG_DOMAIN_KERNEL:
1757 nb_events = kernel_list_events(kernel_tracer_fd, events);
1758 if (nb_events < 0) {
1759 ret = LTTNG_ERR_KERN_LIST_FAIL;
1760 goto error;
1761 }
1762 break;
1763 case LTTNG_DOMAIN_UST:
1764 nb_events = ust_app_list_events(events);
1765 if (nb_events < 0) {
1766 ret = LTTNG_ERR_UST_LIST_FAIL;
1767 goto error;
1768 }
1769 break;
1770 case LTTNG_DOMAIN_LOG4J:
1771 case LTTNG_DOMAIN_JUL:
1772 case LTTNG_DOMAIN_PYTHON:
1773 nb_events = agent_list_events(events, domain);
1774 if (nb_events < 0) {
1775 ret = LTTNG_ERR_UST_LIST_FAIL;
1776 goto error;
1777 }
1778 break;
1779 default:
1780 ret = LTTNG_ERR_UND;
1781 goto error;
1782 }
1783
1784 return nb_events;
1785
1786 error:
1787 /* Return negative value to differentiate return code */
1788 return -ret;
1789 }
1790
1791 /*
1792 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1793 */
1794 ssize_t cmd_list_tracepoint_fields(int domain,
1795 struct lttng_event_field **fields)
1796 {
1797 int ret;
1798 ssize_t nb_fields = 0;
1799
1800 switch (domain) {
1801 case LTTNG_DOMAIN_UST:
1802 nb_fields = ust_app_list_event_fields(fields);
1803 if (nb_fields < 0) {
1804 ret = LTTNG_ERR_UST_LIST_FAIL;
1805 goto error;
1806 }
1807 break;
1808 case LTTNG_DOMAIN_KERNEL:
1809 default: /* fall-through */
1810 ret = LTTNG_ERR_UND;
1811 goto error;
1812 }
1813
1814 return nb_fields;
1815
1816 error:
1817 /* Return negative value to differentiate return code */
1818 return -ret;
1819 }
1820
1821 ssize_t cmd_list_syscalls(struct lttng_event **events)
1822 {
1823 return syscall_table_list(events);
1824 }
1825
1826 /*
1827 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1828 *
1829 * Called with session lock held.
1830 */
1831 ssize_t cmd_list_tracker_pids(struct ltt_session *session,
1832 int domain, int32_t **pids)
1833 {
1834 int ret;
1835 ssize_t nr_pids = 0;
1836
1837 switch (domain) {
1838 case LTTNG_DOMAIN_KERNEL:
1839 {
1840 struct ltt_kernel_session *ksess;
1841
1842 ksess = session->kernel_session;
1843 nr_pids = kernel_list_tracker_pids(ksess, pids);
1844 if (nr_pids < 0) {
1845 ret = LTTNG_ERR_KERN_LIST_FAIL;
1846 goto error;
1847 }
1848 break;
1849 }
1850 case LTTNG_DOMAIN_UST:
1851 {
1852 struct ltt_ust_session *usess;
1853
1854 usess = session->ust_session;
1855 nr_pids = trace_ust_list_tracker_pids(usess, pids);
1856 if (nr_pids < 0) {
1857 ret = LTTNG_ERR_UST_LIST_FAIL;
1858 goto error;
1859 }
1860 break;
1861 }
1862 case LTTNG_DOMAIN_LOG4J:
1863 case LTTNG_DOMAIN_JUL:
1864 case LTTNG_DOMAIN_PYTHON:
1865 default:
1866 ret = LTTNG_ERR_UND;
1867 goto error;
1868 }
1869
1870 return nr_pids;
1871
1872 error:
1873 /* Return negative value to differentiate return code */
1874 return -ret;
1875 }
1876
1877 /*
1878 * Command LTTNG_START_TRACE processed by the client thread.
1879 *
1880 * Called with session mutex held.
1881 */
1882 int cmd_start_trace(struct ltt_session *session)
1883 {
1884 int ret;
1885 unsigned long nb_chan = 0;
1886 struct ltt_kernel_session *ksession;
1887 struct ltt_ust_session *usess;
1888
1889 assert(session);
1890
1891 /* Ease our life a bit ;) */
1892 ksession = session->kernel_session;
1893 usess = session->ust_session;
1894
1895 /* Is the session already started? */
1896 if (session->active) {
1897 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1898 goto error;
1899 }
1900
1901 /*
1902 * Starting a session without channel is useless since after that it's not
1903 * possible to enable channel thus inform the client.
1904 */
1905 if (usess && usess->domain_global.channels) {
1906 rcu_read_lock();
1907 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1908 rcu_read_unlock();
1909 }
1910 if (ksession) {
1911 nb_chan += ksession->channel_count;
1912 }
1913 if (!nb_chan) {
1914 ret = LTTNG_ERR_NO_CHANNEL;
1915 goto error;
1916 }
1917
1918 /* Kernel tracing */
1919 if (ksession != NULL) {
1920 ret = start_kernel_session(ksession, kernel_tracer_fd);
1921 if (ret != LTTNG_OK) {
1922 goto error;
1923 }
1924 }
1925
1926 /* Flag session that trace should start automatically */
1927 if (usess) {
1928 /*
1929 * Even though the start trace might fail, flag this session active so
1930 * other application coming in are started by default.
1931 */
1932 usess->active = 1;
1933
1934 ret = ust_app_start_trace_all(usess);
1935 if (ret < 0) {
1936 ret = LTTNG_ERR_UST_START_FAIL;
1937 goto error;
1938 }
1939 }
1940
1941 /* Flag this after a successful start. */
1942 session->has_been_started = 1;
1943 session->active = 1;
1944
1945 ret = LTTNG_OK;
1946
1947 error:
1948 return ret;
1949 }
1950
1951 /*
1952 * Command LTTNG_STOP_TRACE processed by the client thread.
1953 */
1954 int cmd_stop_trace(struct ltt_session *session)
1955 {
1956 int ret;
1957 struct ltt_kernel_channel *kchan;
1958 struct ltt_kernel_session *ksession;
1959 struct ltt_ust_session *usess;
1960
1961 assert(session);
1962
1963 /* Short cut */
1964 ksession = session->kernel_session;
1965 usess = session->ust_session;
1966
1967 /* Session is not active. Skip everythong and inform the client. */
1968 if (!session->active) {
1969 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1970 goto error;
1971 }
1972
1973 /* Kernel tracer */
1974 if (ksession && ksession->active) {
1975 DBG("Stop kernel tracing");
1976
1977 /* Flush metadata if exist */
1978 if (ksession->metadata_stream_fd >= 0) {
1979 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1980 if (ret < 0) {
1981 ERR("Kernel metadata flush failed");
1982 }
1983 }
1984
1985 /* Flush all buffers before stopping */
1986 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1987 ret = kernel_flush_buffer(kchan);
1988 if (ret < 0) {
1989 ERR("Kernel flush buffer error");
1990 }
1991 }
1992
1993 ret = kernel_stop_session(ksession);
1994 if (ret < 0) {
1995 ret = LTTNG_ERR_KERN_STOP_FAIL;
1996 goto error;
1997 }
1998
1999 kernel_wait_quiescent(kernel_tracer_fd);
2000
2001 ksession->active = 0;
2002 }
2003
2004 if (usess && usess->active) {
2005 /*
2006 * Even though the stop trace might fail, flag this session inactive so
2007 * other application coming in are not started by default.
2008 */
2009 usess->active = 0;
2010
2011 ret = ust_app_stop_trace_all(usess);
2012 if (ret < 0) {
2013 ret = LTTNG_ERR_UST_STOP_FAIL;
2014 goto error;
2015 }
2016 }
2017
2018 /* Flag inactive after a successful stop. */
2019 session->active = 0;
2020 ret = LTTNG_OK;
2021
2022 error:
2023 return ret;
2024 }
2025
2026 /*
2027 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2028 */
2029 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2030 struct lttng_uri *uris)
2031 {
2032 int ret, i;
2033 struct ltt_kernel_session *ksess = session->kernel_session;
2034 struct ltt_ust_session *usess = session->ust_session;
2035
2036 assert(session);
2037 assert(uris);
2038 assert(nb_uri > 0);
2039
2040 /* Can't set consumer URI if the session is active. */
2041 if (session->active) {
2042 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2043 goto error;
2044 }
2045
2046 /* Set the "global" consumer URIs */
2047 for (i = 0; i < nb_uri; i++) {
2048 ret = add_uri_to_consumer(session->consumer,
2049 &uris[i], 0, session->name);
2050 if (ret != LTTNG_OK) {
2051 goto error;
2052 }
2053 }
2054
2055 /* Set UST session URIs */
2056 if (session->ust_session) {
2057 for (i = 0; i < nb_uri; i++) {
2058 ret = add_uri_to_consumer(
2059 session->ust_session->consumer,
2060 &uris[i], LTTNG_DOMAIN_UST,
2061 session->name);
2062 if (ret != LTTNG_OK) {
2063 goto error;
2064 }
2065 }
2066 }
2067
2068 /* Set kernel session URIs */
2069 if (session->kernel_session) {
2070 for (i = 0; i < nb_uri; i++) {
2071 ret = add_uri_to_consumer(
2072 session->kernel_session->consumer,
2073 &uris[i], LTTNG_DOMAIN_KERNEL,
2074 session->name);
2075 if (ret != LTTNG_OK) {
2076 goto error;
2077 }
2078 }
2079 }
2080
2081 /*
2082 * Make sure to set the session in output mode after we set URI since a
2083 * session can be created without URL (thus flagged in no output mode).
2084 */
2085 session->output_traces = 1;
2086 if (ksess) {
2087 ksess->output_traces = 1;
2088 }
2089
2090 if (usess) {
2091 usess->output_traces = 1;
2092 }
2093
2094 /* All good! */
2095 ret = LTTNG_OK;
2096
2097 error:
2098 return ret;
2099 }
2100
2101 /*
2102 * Command LTTNG_CREATE_SESSION processed by the client thread.
2103 */
2104 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2105 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2106 {
2107 int ret;
2108 struct ltt_session *session;
2109
2110 assert(name);
2111 assert(creds);
2112
2113 /*
2114 * Verify if the session already exist
2115 *
2116 * XXX: There is no need for the session lock list here since the caller
2117 * (process_client_msg) is holding it. We might want to change that so a
2118 * single command does not lock the entire session list.
2119 */
2120 session = session_find_by_name(name);
2121 if (session != NULL) {
2122 ret = LTTNG_ERR_EXIST_SESS;
2123 goto find_error;
2124 }
2125
2126 /* Create tracing session in the registry */
2127 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2128 LTTNG_SOCK_GET_GID_CRED(creds));
2129 if (ret != LTTNG_OK) {
2130 goto session_error;
2131 }
2132
2133 /*
2134 * Get the newly created session pointer back
2135 *
2136 * XXX: There is no need for the session lock list here since the caller
2137 * (process_client_msg) is holding it. We might want to change that so a
2138 * single command does not lock the entire session list.
2139 */
2140 session = session_find_by_name(name);
2141 assert(session);
2142
2143 session->live_timer = live_timer;
2144 /* Create default consumer output for the session not yet created. */
2145 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2146 if (session->consumer == NULL) {
2147 ret = LTTNG_ERR_FATAL;
2148 goto consumer_error;
2149 }
2150
2151 if (uris) {
2152 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2153 if (ret != LTTNG_OK) {
2154 goto consumer_error;
2155 }
2156 session->output_traces = 1;
2157 } else {
2158 session->output_traces = 0;
2159 DBG2("Session %s created with no output", session->name);
2160 }
2161
2162 session->consumer->enabled = 1;
2163
2164 return LTTNG_OK;
2165
2166 consumer_error:
2167 session_destroy(session);
2168 session_error:
2169 find_error:
2170 return ret;
2171 }
2172
2173 /*
2174 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2175 */
2176 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2177 size_t nb_uri, lttng_sock_cred *creds)
2178 {
2179 int ret;
2180 struct ltt_session *session;
2181 struct snapshot_output *new_output = NULL;
2182
2183 assert(name);
2184 assert(creds);
2185
2186 /*
2187 * Create session in no output mode with URIs set to NULL. The uris we've
2188 * received are for a default snapshot output if one.
2189 */
2190 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2191 if (ret != LTTNG_OK) {
2192 goto error;
2193 }
2194
2195 /* Get the newly created session pointer back. This should NEVER fail. */
2196 session = session_find_by_name(name);
2197 assert(session);
2198
2199 /* Flag session for snapshot mode. */
2200 session->snapshot_mode = 1;
2201
2202 /* Skip snapshot output creation if no URI is given. */
2203 if (nb_uri == 0) {
2204 goto end;
2205 }
2206
2207 new_output = snapshot_output_alloc();
2208 if (!new_output) {
2209 ret = LTTNG_ERR_NOMEM;
2210 goto error_snapshot_alloc;
2211 }
2212
2213 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2214 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2215 if (ret < 0) {
2216 if (ret == -ENOMEM) {
2217 ret = LTTNG_ERR_NOMEM;
2218 } else {
2219 ret = LTTNG_ERR_INVALID;
2220 }
2221 goto error_snapshot;
2222 }
2223
2224 rcu_read_lock();
2225 snapshot_add_output(&session->snapshot, new_output);
2226 rcu_read_unlock();
2227
2228 end:
2229 return LTTNG_OK;
2230
2231 error_snapshot:
2232 snapshot_output_destroy(new_output);
2233 error_snapshot_alloc:
2234 session_destroy(session);
2235 error:
2236 return ret;
2237 }
2238
2239 /*
2240 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2241 *
2242 * Called with session lock held.
2243 */
2244 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2245 {
2246 int ret;
2247 struct ltt_ust_session *usess;
2248 struct ltt_kernel_session *ksess;
2249
2250 /* Safety net */
2251 assert(session);
2252
2253 usess = session->ust_session;
2254 ksess = session->kernel_session;
2255
2256 /* Clean kernel session teardown */
2257 kernel_destroy_session(ksess);
2258
2259 /* UST session teardown */
2260 if (usess) {
2261 /* Close any relayd session */
2262 consumer_output_send_destroy_relayd(usess->consumer);
2263
2264 /* Destroy every UST application related to this session. */
2265 ret = ust_app_destroy_trace_all(usess);
2266 if (ret) {
2267 ERR("Error in ust_app_destroy_trace_all");
2268 }
2269
2270 /* Clean up the rest. */
2271 trace_ust_destroy_session(usess);
2272 }
2273
2274 /*
2275 * Must notify the kernel thread here to update it's poll set in order to
2276 * remove the channel(s)' fd just destroyed.
2277 */
2278 ret = notify_thread_pipe(wpipe);
2279 if (ret < 0) {
2280 PERROR("write kernel poll pipe");
2281 }
2282
2283 ret = session_destroy(session);
2284
2285 return ret;
2286 }
2287
2288 /*
2289 * Command LTTNG_CALIBRATE processed by the client thread.
2290 */
2291 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2292 {
2293 int ret;
2294
2295 switch (domain) {
2296 case LTTNG_DOMAIN_KERNEL:
2297 {
2298 struct lttng_kernel_calibrate kcalibrate;
2299
2300 switch (calibrate->type) {
2301 case LTTNG_CALIBRATE_FUNCTION:
2302 default:
2303 /* Default and only possible calibrate option. */
2304 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2305 break;
2306 }
2307
2308 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2309 if (ret < 0) {
2310 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2311 goto error;
2312 }
2313 break;
2314 }
2315 case LTTNG_DOMAIN_UST:
2316 {
2317 struct lttng_ust_calibrate ucalibrate;
2318
2319 switch (calibrate->type) {
2320 case LTTNG_CALIBRATE_FUNCTION:
2321 default:
2322 /* Default and only possible calibrate option. */
2323 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2324 break;
2325 }
2326
2327 ret = ust_app_calibrate_glb(&ucalibrate);
2328 if (ret < 0) {
2329 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2330 goto error;
2331 }
2332 break;
2333 }
2334 default:
2335 ret = LTTNG_ERR_UND;
2336 goto error;
2337 }
2338
2339 ret = LTTNG_OK;
2340
2341 error:
2342 return ret;
2343 }
2344
2345 /*
2346 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2347 */
2348 int cmd_register_consumer(struct ltt_session *session, int domain,
2349 const char *sock_path, struct consumer_data *cdata)
2350 {
2351 int ret, sock;
2352 struct consumer_socket *socket = NULL;
2353
2354 assert(session);
2355 assert(cdata);
2356 assert(sock_path);
2357
2358 switch (domain) {
2359 case LTTNG_DOMAIN_KERNEL:
2360 {
2361 struct ltt_kernel_session *ksess = session->kernel_session;
2362
2363 assert(ksess);
2364
2365 /* Can't register a consumer if there is already one */
2366 if (ksess->consumer_fds_sent != 0) {
2367 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2368 goto error;
2369 }
2370
2371 sock = lttcomm_connect_unix_sock(sock_path);
2372 if (sock < 0) {
2373 ret = LTTNG_ERR_CONNECT_FAIL;
2374 goto error;
2375 }
2376 cdata->cmd_sock = sock;
2377
2378 socket = consumer_allocate_socket(&cdata->cmd_sock);
2379 if (socket == NULL) {
2380 ret = close(sock);
2381 if (ret < 0) {
2382 PERROR("close register consumer");
2383 }
2384 cdata->cmd_sock = -1;
2385 ret = LTTNG_ERR_FATAL;
2386 goto error;
2387 }
2388
2389 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2390 if (socket->lock == NULL) {
2391 PERROR("zmalloc pthread mutex");
2392 ret = LTTNG_ERR_FATAL;
2393 goto error;
2394 }
2395 pthread_mutex_init(socket->lock, NULL);
2396 socket->registered = 1;
2397
2398 rcu_read_lock();
2399 consumer_add_socket(socket, ksess->consumer);
2400 rcu_read_unlock();
2401
2402 pthread_mutex_lock(&cdata->pid_mutex);
2403 cdata->pid = -1;
2404 pthread_mutex_unlock(&cdata->pid_mutex);
2405
2406 break;
2407 }
2408 default:
2409 /* TODO: Userspace tracing */
2410 ret = LTTNG_ERR_UND;
2411 goto error;
2412 }
2413
2414 return LTTNG_OK;
2415
2416 error:
2417 if (socket) {
2418 consumer_destroy_socket(socket);
2419 }
2420 return ret;
2421 }
2422
2423 /*
2424 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2425 */
2426 ssize_t cmd_list_domains(struct ltt_session *session,
2427 struct lttng_domain **domains)
2428 {
2429 int ret, index = 0;
2430 ssize_t nb_dom = 0;
2431 struct agent *agt;
2432 struct lttng_ht_iter iter;
2433
2434 if (session->kernel_session != NULL) {
2435 DBG3("Listing domains found kernel domain");
2436 nb_dom++;
2437 }
2438
2439 if (session->ust_session != NULL) {
2440 DBG3("Listing domains found UST global domain");
2441 nb_dom++;
2442
2443 rcu_read_lock();
2444 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2445 agt, node.node) {
2446 if (agt->being_used) {
2447 nb_dom++;
2448 }
2449 }
2450 rcu_read_unlock();
2451 }
2452
2453 if (!nb_dom) {
2454 goto end;
2455 }
2456
2457 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2458 if (*domains == NULL) {
2459 ret = LTTNG_ERR_FATAL;
2460 goto error;
2461 }
2462
2463 if (session->kernel_session != NULL) {
2464 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2465
2466 /* Kernel session buffer type is always GLOBAL */
2467 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2468
2469 index++;
2470 }
2471
2472 if (session->ust_session != NULL) {
2473 (*domains)[index].type = LTTNG_DOMAIN_UST;
2474 (*domains)[index].buf_type = session->ust_session->buffer_type;
2475 index++;
2476
2477 rcu_read_lock();
2478 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2479 agt, node.node) {
2480 if (agt->being_used) {
2481 (*domains)[index].type = agt->domain;
2482 (*domains)[index].buf_type = session->ust_session->buffer_type;
2483 index++;
2484 }
2485 }
2486 rcu_read_unlock();
2487 }
2488 end:
2489 return nb_dom;
2490
2491 error:
2492 /* Return negative value to differentiate return code */
2493 return -ret;
2494 }
2495
2496
2497 /*
2498 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2499 */
2500 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2501 struct lttng_channel **channels)
2502 {
2503 int ret;
2504 ssize_t nb_chan = 0;
2505
2506 switch (domain) {
2507 case LTTNG_DOMAIN_KERNEL:
2508 if (session->kernel_session != NULL) {
2509 nb_chan = session->kernel_session->channel_count;
2510 }
2511 DBG3("Number of kernel channels %zd", nb_chan);
2512 if (nb_chan <= 0) {
2513 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2514 }
2515 break;
2516 case LTTNG_DOMAIN_UST:
2517 if (session->ust_session != NULL) {
2518 rcu_read_lock();
2519 nb_chan = lttng_ht_get_count(
2520 session->ust_session->domain_global.channels);
2521 rcu_read_unlock();
2522 }
2523 DBG3("Number of UST global channels %zd", nb_chan);
2524 if (nb_chan < 0) {
2525 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2526 goto error;
2527 }
2528 break;
2529 default:
2530 ret = LTTNG_ERR_UND;
2531 goto error;
2532 }
2533
2534 if (nb_chan > 0) {
2535 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2536 if (*channels == NULL) {
2537 ret = LTTNG_ERR_FATAL;
2538 goto error;
2539 }
2540
2541 list_lttng_channels(domain, session, *channels);
2542 }
2543
2544 return nb_chan;
2545
2546 error:
2547 /* Return negative value to differentiate return code */
2548 return -ret;
2549 }
2550
2551 /*
2552 * Command LTTNG_LIST_EVENTS processed by the client thread.
2553 */
2554 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2555 char *channel_name, struct lttng_event **events)
2556 {
2557 int ret = 0;
2558 ssize_t nb_event = 0;
2559
2560 switch (domain) {
2561 case LTTNG_DOMAIN_KERNEL:
2562 if (session->kernel_session != NULL) {
2563 nb_event = list_lttng_kernel_events(channel_name,
2564 session->kernel_session, events);
2565 }
2566 break;
2567 case LTTNG_DOMAIN_UST:
2568 {
2569 if (session->ust_session != NULL) {
2570 nb_event = list_lttng_ust_global_events(channel_name,
2571 &session->ust_session->domain_global, events);
2572 }
2573 break;
2574 }
2575 case LTTNG_DOMAIN_LOG4J:
2576 case LTTNG_DOMAIN_JUL:
2577 case LTTNG_DOMAIN_PYTHON:
2578 if (session->ust_session) {
2579 struct lttng_ht_iter iter;
2580 struct agent *agt;
2581
2582 rcu_read_lock();
2583 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2584 &iter.iter, agt, node.node) {
2585 nb_event = list_lttng_agent_events(agt, events);
2586 }
2587 rcu_read_unlock();
2588 }
2589 break;
2590 default:
2591 ret = LTTNG_ERR_UND;
2592 goto error;
2593 }
2594
2595 return nb_event;
2596
2597 error:
2598 /* Return negative value to differentiate return code */
2599 return -ret;
2600 }
2601
2602 /*
2603 * Using the session list, filled a lttng_session array to send back to the
2604 * client for session listing.
2605 *
2606 * The session list lock MUST be acquired before calling this function. Use
2607 * session_lock_list() and session_unlock_list().
2608 */
2609 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2610 gid_t gid)
2611 {
2612 int ret;
2613 unsigned int i = 0;
2614 struct ltt_session *session;
2615 struct ltt_session_list *list = session_get_list();
2616
2617 DBG("Getting all available session for UID %d GID %d",
2618 uid, gid);
2619 /*
2620 * Iterate over session list and append data after the control struct in
2621 * the buffer.
2622 */
2623 cds_list_for_each_entry(session, &list->head, list) {
2624 /*
2625 * Only list the sessions the user can control.
2626 */
2627 if (!session_access_ok(session, uid, gid)) {
2628 continue;
2629 }
2630
2631 struct ltt_kernel_session *ksess = session->kernel_session;
2632 struct ltt_ust_session *usess = session->ust_session;
2633
2634 if (session->consumer->type == CONSUMER_DST_NET ||
2635 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2636 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2637 ret = build_network_session_path(sessions[i].path,
2638 sizeof(sessions[i].path), session);
2639 } else {
2640 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2641 session->consumer->dst.trace_path);
2642 }
2643 if (ret < 0) {
2644 PERROR("snprintf session path");
2645 continue;
2646 }
2647
2648 strncpy(sessions[i].name, session->name, NAME_MAX);
2649 sessions[i].name[NAME_MAX - 1] = '\0';
2650 sessions[i].enabled = session->active;
2651 sessions[i].snapshot_mode = session->snapshot_mode;
2652 sessions[i].live_timer_interval = session->live_timer;
2653 i++;
2654 }
2655 }
2656
2657 /*
2658 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2659 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2660 */
2661 int cmd_data_pending(struct ltt_session *session)
2662 {
2663 int ret;
2664 struct ltt_kernel_session *ksess = session->kernel_session;
2665 struct ltt_ust_session *usess = session->ust_session;
2666
2667 assert(session);
2668
2669 /* Session MUST be stopped to ask for data availability. */
2670 if (session->active) {
2671 ret = LTTNG_ERR_SESSION_STARTED;
2672 goto error;
2673 } else {
2674 /*
2675 * If stopped, just make sure we've started before else the above call
2676 * will always send that there is data pending.
2677 *
2678 * The consumer assumes that when the data pending command is received,
2679 * the trace has been started before or else no output data is written
2680 * by the streams which is a condition for data pending. So, this is
2681 * *VERY* important that we don't ask the consumer before a start
2682 * trace.
2683 */
2684 if (!session->has_been_started) {
2685 ret = 0;
2686 goto error;
2687 }
2688 }
2689
2690 if (ksess && ksess->consumer) {
2691 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2692 if (ret == 1) {
2693 /* Data is still being extracted for the kernel. */
2694 goto error;
2695 }
2696 }
2697
2698 if (usess && usess->consumer) {
2699 ret = consumer_is_data_pending(usess->id, usess->consumer);
2700 if (ret == 1) {
2701 /* Data is still being extracted for the kernel. */
2702 goto error;
2703 }
2704 }
2705
2706 /* Data is ready to be read by a viewer */
2707 ret = 0;
2708
2709 error:
2710 return ret;
2711 }
2712
2713 /*
2714 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2715 *
2716 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2717 */
2718 int cmd_snapshot_add_output(struct ltt_session *session,
2719 struct lttng_snapshot_output *output, uint32_t *id)
2720 {
2721 int ret;
2722 struct snapshot_output *new_output;
2723
2724 assert(session);
2725 assert(output);
2726
2727 DBG("Cmd snapshot add output for session %s", session->name);
2728
2729 /*
2730 * Permission denied to create an output if the session is not
2731 * set in no output mode.
2732 */
2733 if (session->output_traces) {
2734 ret = LTTNG_ERR_EPERM;
2735 goto error;
2736 }
2737
2738 /* Only one output is allowed until we have the "tee" feature. */
2739 if (session->snapshot.nb_output == 1) {
2740 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2741 goto error;
2742 }
2743
2744 new_output = snapshot_output_alloc();
2745 if (!new_output) {
2746 ret = LTTNG_ERR_NOMEM;
2747 goto error;
2748 }
2749
2750 ret = snapshot_output_init(output->max_size, output->name,
2751 output->ctrl_url, output->data_url, session->consumer, new_output,
2752 &session->snapshot);
2753 if (ret < 0) {
2754 if (ret == -ENOMEM) {
2755 ret = LTTNG_ERR_NOMEM;
2756 } else {
2757 ret = LTTNG_ERR_INVALID;
2758 }
2759 goto free_error;
2760 }
2761
2762 rcu_read_lock();
2763 snapshot_add_output(&session->snapshot, new_output);
2764 if (id) {
2765 *id = new_output->id;
2766 }
2767 rcu_read_unlock();
2768
2769 return LTTNG_OK;
2770
2771 free_error:
2772 snapshot_output_destroy(new_output);
2773 error:
2774 return ret;
2775 }
2776
2777 /*
2778 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2779 *
2780 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2781 */
2782 int cmd_snapshot_del_output(struct ltt_session *session,
2783 struct lttng_snapshot_output *output)
2784 {
2785 int ret;
2786 struct snapshot_output *sout = NULL;
2787
2788 assert(session);
2789 assert(output);
2790
2791 rcu_read_lock();
2792
2793 /*
2794 * Permission denied to create an output if the session is not
2795 * set in no output mode.
2796 */
2797 if (session->output_traces) {
2798 ret = LTTNG_ERR_EPERM;
2799 goto error;
2800 }
2801
2802 if (output->id) {
2803 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2804 session->name);
2805 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2806 } else if (*output->name != '\0') {
2807 DBG("Cmd snapshot del output name %s for session %s", output->name,
2808 session->name);
2809 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2810 }
2811 if (!sout) {
2812 ret = LTTNG_ERR_INVALID;
2813 goto error;
2814 }
2815
2816 snapshot_delete_output(&session->snapshot, sout);
2817 snapshot_output_destroy(sout);
2818 ret = LTTNG_OK;
2819
2820 error:
2821 rcu_read_unlock();
2822 return ret;
2823 }
2824
2825 /*
2826 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2827 *
2828 * If no output is available, outputs is untouched and 0 is returned.
2829 *
2830 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2831 */
2832 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2833 struct lttng_snapshot_output **outputs)
2834 {
2835 int ret, idx = 0;
2836 struct lttng_snapshot_output *list = NULL;
2837 struct lttng_ht_iter iter;
2838 struct snapshot_output *output;
2839
2840 assert(session);
2841 assert(outputs);
2842
2843 DBG("Cmd snapshot list outputs for session %s", session->name);
2844
2845 /*
2846 * Permission denied to create an output if the session is not
2847 * set in no output mode.
2848 */
2849 if (session->output_traces) {
2850 ret = -LTTNG_ERR_EPERM;
2851 goto error;
2852 }
2853
2854 if (session->snapshot.nb_output == 0) {
2855 ret = 0;
2856 goto error;
2857 }
2858
2859 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2860 if (!list) {
2861 ret = -LTTNG_ERR_NOMEM;
2862 goto error;
2863 }
2864
2865 /* Copy list from session to the new list object. */
2866 rcu_read_lock();
2867 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2868 output, node.node) {
2869 assert(output->consumer);
2870 list[idx].id = output->id;
2871 list[idx].max_size = output->max_size;
2872 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2873 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2874 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2875 sizeof(list[idx].ctrl_url));
2876 } else {
2877 /* Control URI. */
2878 ret = uri_to_str_url(&output->consumer->dst.net.control,
2879 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2880 if (ret < 0) {
2881 ret = -LTTNG_ERR_NOMEM;
2882 goto error;
2883 }
2884
2885 /* Data URI. */
2886 ret = uri_to_str_url(&output->consumer->dst.net.data,
2887 list[idx].data_url, sizeof(list[idx].data_url));
2888 if (ret < 0) {
2889 ret = -LTTNG_ERR_NOMEM;
2890 goto error;
2891 }
2892 }
2893 idx++;
2894 }
2895
2896 *outputs = list;
2897 list = NULL;
2898 ret = session->snapshot.nb_output;
2899 error:
2900 free(list);
2901 rcu_read_unlock();
2902 return ret;
2903 }
2904
2905 /*
2906 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2907 * snapshot output is *not* set with a remote destination.
2908 *
2909 * Return 0 on success or a LTTNG_ERR code.
2910 */
2911 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2912 struct snapshot_output *snap_output, struct ltt_session *session)
2913 {
2914 int ret = LTTNG_OK;
2915 struct lttng_ht_iter iter;
2916 struct consumer_socket *socket;
2917
2918 assert(consumer);
2919 assert(snap_output);
2920 assert(session);
2921
2922 DBG2("Set relayd object from snapshot output");
2923
2924 /* Ignore if snapshot consumer output is not network. */
2925 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2926 goto error;
2927 }
2928
2929 /*
2930 * For each consumer socket, create and send the relayd object of the
2931 * snapshot output.
2932 */
2933 rcu_read_lock();
2934 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2935 socket, node.node) {
2936 ret = send_consumer_relayd_sockets(0, session->id,
2937 snap_output->consumer, socket,
2938 session->name, session->hostname,
2939 session->live_timer);
2940 if (ret != LTTNG_OK) {
2941 rcu_read_unlock();
2942 goto error;
2943 }
2944 }
2945 rcu_read_unlock();
2946
2947 error:
2948 return ret;
2949 }
2950
2951 /*
2952 * Record a kernel snapshot.
2953 *
2954 * Return LTTNG_OK on success or a LTTNG_ERR code.
2955 */
2956 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2957 struct snapshot_output *output, struct ltt_session *session,
2958 int wait, uint64_t nb_packets_per_stream)
2959 {
2960 int ret;
2961
2962 assert(ksess);
2963 assert(output);
2964 assert(session);
2965
2966 /* Get the datetime for the snapshot output directory. */
2967 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2968 sizeof(output->datetime));
2969 if (!ret) {
2970 ret = LTTNG_ERR_INVALID;
2971 goto error;
2972 }
2973
2974 /*
2975 * Copy kernel session sockets so we can communicate with the right
2976 * consumer for the snapshot record command.
2977 */
2978 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2979 if (ret < 0) {
2980 ret = LTTNG_ERR_NOMEM;
2981 goto error;
2982 }
2983
2984 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2985 if (ret != LTTNG_OK) {
2986 goto error_snapshot;
2987 }
2988
2989 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
2990 if (ret != LTTNG_OK) {
2991 goto error_snapshot;
2992 }
2993
2994 ret = LTTNG_OK;
2995 goto end;
2996
2997 error_snapshot:
2998 /* Clean up copied sockets so this output can use some other later on. */
2999 consumer_destroy_output_sockets(output->consumer);
3000 error:
3001 end:
3002 return ret;
3003 }
3004
3005 /*
3006 * Record a UST snapshot.
3007 *
3008 * Return 0 on success or a LTTNG_ERR error code.
3009 */
3010 static int record_ust_snapshot(struct ltt_ust_session *usess,
3011 struct snapshot_output *output, struct ltt_session *session,
3012 int wait, uint64_t nb_packets_per_stream)
3013 {
3014 int ret;
3015
3016 assert(usess);
3017 assert(output);
3018 assert(session);
3019
3020 /* Get the datetime for the snapshot output directory. */
3021 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3022 sizeof(output->datetime));
3023 if (!ret) {
3024 ret = LTTNG_ERR_INVALID;
3025 goto error;
3026 }
3027
3028 /*
3029 * Copy UST session sockets so we can communicate with the right
3030 * consumer for the snapshot record command.
3031 */
3032 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3033 if (ret < 0) {
3034 ret = LTTNG_ERR_NOMEM;
3035 goto error;
3036 }
3037
3038 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3039 if (ret != LTTNG_OK) {
3040 goto error_snapshot;
3041 }
3042
3043 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
3044 if (ret < 0) {
3045 switch (-ret) {
3046 case EINVAL:
3047 ret = LTTNG_ERR_INVALID;
3048 break;
3049 case ENODATA:
3050 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3051 break;
3052 default:
3053 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3054 break;
3055 }
3056 goto error_snapshot;
3057 }
3058
3059 ret = LTTNG_OK;
3060
3061 error_snapshot:
3062 /* Clean up copied sockets so this output can use some other later on. */
3063 consumer_destroy_output_sockets(output->consumer);
3064 error:
3065 return ret;
3066 }
3067
3068 static
3069 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3070 uint64_t cur_nr_packets)
3071 {
3072 uint64_t tot_size = 0;
3073
3074 if (session->kernel_session) {
3075 struct ltt_kernel_channel *chan;
3076 struct ltt_kernel_session *ksess = session->kernel_session;
3077
3078 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3079 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3080 /*
3081 * Don't take channel into account if we
3082 * already grab all its packets.
3083 */
3084 continue;
3085 }
3086 tot_size += chan->channel->attr.subbuf_size
3087 * chan->stream_count;
3088 }
3089 }
3090
3091 if (session->ust_session) {
3092 struct ltt_ust_session *usess = session->ust_session;
3093
3094 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3095 cur_nr_packets);
3096 }
3097
3098 return tot_size;
3099 }
3100
3101 /*
3102 * Calculate the number of packets we can grab from each stream that
3103 * fits within the overall snapshot max size.
3104 *
3105 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3106 * the number of packets per stream.
3107 *
3108 * TODO: this approach is not perfect: we consider the worse case
3109 * (packet filling the sub-buffers) as an upper bound, but we could do
3110 * better if we do this calculation while we actually grab the packet
3111 * content: we would know how much padding we don't actually store into
3112 * the file.
3113 *
3114 * This algorithm is currently bounded by the number of packets per
3115 * stream.
3116 *
3117 * Since we call this algorithm before actually grabbing the data, it's
3118 * an approximation: for instance, applications could appear/disappear
3119 * in between this call and actually grabbing data.
3120 */
3121 static
3122 int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
3123 {
3124 int64_t size_left;
3125 uint64_t cur_nb_packets = 0;
3126
3127 if (!max_size) {
3128 return 0; /* Infinite */
3129 }
3130
3131 size_left = max_size;
3132 for (;;) {
3133 uint64_t one_more_packet_tot_size;
3134
3135 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3136 cur_nb_packets);
3137 if (!one_more_packet_tot_size) {
3138 /* We are already grabbing all packets. */
3139 break;
3140 }
3141 size_left -= one_more_packet_tot_size;
3142 if (size_left < 0) {
3143 break;
3144 }
3145 cur_nb_packets++;
3146 }
3147 if (!cur_nb_packets) {
3148 /* Not enough room to grab one packet of each stream, error. */
3149 return -1;
3150 }
3151 return cur_nb_packets;
3152 }
3153
3154 /*
3155 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3156 *
3157 * The wait parameter is ignored so this call always wait for the snapshot to
3158 * complete before returning.
3159 *
3160 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3161 */
3162 int cmd_snapshot_record(struct ltt_session *session,
3163 struct lttng_snapshot_output *output, int wait)
3164 {
3165 int ret = LTTNG_OK;
3166 unsigned int use_tmp_output = 0;
3167 struct snapshot_output tmp_output;
3168 unsigned int snapshot_success = 0;
3169
3170 assert(session);
3171 assert(output);
3172
3173 DBG("Cmd snapshot record for session %s", session->name);
3174
3175 /*
3176 * Permission denied to create an output if the session is not
3177 * set in no output mode.
3178 */
3179 if (session->output_traces) {
3180 ret = LTTNG_ERR_EPERM;
3181 goto error;
3182 }
3183
3184 /* The session needs to be started at least once. */
3185 if (!session->has_been_started) {
3186 ret = LTTNG_ERR_START_SESSION_ONCE;
3187 goto error;
3188 }
3189
3190 /* Use temporary output for the session. */
3191 if (*output->ctrl_url != '\0') {
3192 ret = snapshot_output_init(output->max_size, output->name,
3193 output->ctrl_url, output->data_url, session->consumer,
3194 &tmp_output, NULL);
3195 if (ret < 0) {
3196 if (ret == -ENOMEM) {
3197 ret = LTTNG_ERR_NOMEM;
3198 } else {
3199 ret = LTTNG_ERR_INVALID;
3200 }
3201 goto error;
3202 }
3203 /* Use the global session count for the temporary snapshot. */
3204 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3205 use_tmp_output = 1;
3206 }
3207
3208 if (session->kernel_session) {
3209 struct ltt_kernel_session *ksess = session->kernel_session;
3210
3211 if (use_tmp_output) {
3212 int64_t nb_packets_per_stream;
3213
3214 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3215 tmp_output.max_size);
3216 if (nb_packets_per_stream < 0) {
3217 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3218 goto error;
3219 }
3220 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3221 wait, nb_packets_per_stream);
3222 if (ret != LTTNG_OK) {
3223 goto error;
3224 }
3225 snapshot_success = 1;
3226 } else {
3227 struct snapshot_output *sout;
3228 struct lttng_ht_iter iter;
3229
3230 rcu_read_lock();
3231 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3232 &iter.iter, sout, node.node) {
3233 int64_t nb_packets_per_stream;
3234
3235 /*
3236 * Make a local copy of the output and assign the possible
3237 * temporary value given by the caller.
3238 */
3239 memset(&tmp_output, 0, sizeof(tmp_output));
3240 memcpy(&tmp_output, sout, sizeof(tmp_output));
3241
3242 if (output->max_size != (uint64_t) -1ULL) {
3243 tmp_output.max_size = output->max_size;
3244 }
3245
3246 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3247 tmp_output.max_size);
3248 if (nb_packets_per_stream < 0) {
3249 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3250 goto error;
3251 }
3252
3253 /* Use temporary name. */
3254 if (*output->name != '\0') {
3255 strncpy(tmp_output.name, output->name,
3256 sizeof(tmp_output.name));
3257 }
3258
3259 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3260
3261 ret = record_kernel_snapshot(ksess, &tmp_output,
3262 session, wait, nb_packets_per_stream);
3263 if (ret != LTTNG_OK) {
3264 rcu_read_unlock();
3265 goto error;
3266 }
3267 snapshot_success = 1;
3268 }
3269 rcu_read_unlock();
3270 }
3271 }
3272
3273 if (session->ust_session) {
3274 struct ltt_ust_session *usess = session->ust_session;
3275
3276 if (use_tmp_output) {
3277 int64_t nb_packets_per_stream;
3278
3279 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3280 tmp_output.max_size);
3281 if (nb_packets_per_stream < 0) {
3282 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3283 goto error;
3284 }
3285 ret = record_ust_snapshot(usess, &tmp_output, session,
3286 wait, nb_packets_per_stream);
3287 if (ret != LTTNG_OK) {
3288 goto error;
3289 }
3290 snapshot_success = 1;
3291 } else {
3292 struct snapshot_output *sout;
3293 struct lttng_ht_iter iter;
3294
3295 rcu_read_lock();
3296 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3297 &iter.iter, sout, node.node) {
3298 int64_t nb_packets_per_stream;
3299
3300 /*
3301 * Make a local copy of the output and assign the possible
3302 * temporary value given by the caller.
3303 */
3304 memset(&tmp_output, 0, sizeof(tmp_output));
3305 memcpy(&tmp_output, sout, sizeof(tmp_output));
3306
3307 if (output->max_size != (uint64_t) -1ULL) {
3308 tmp_output.max_size = output->max_size;
3309 }
3310
3311 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3312 tmp_output.max_size);
3313 if (nb_packets_per_stream < 0) {
3314 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3315 rcu_read_unlock();
3316 goto error;
3317 }
3318
3319 /* Use temporary name. */
3320 if (*output->name != '\0') {
3321 strncpy(tmp_output.name, output->name,
3322 sizeof(tmp_output.name));
3323 }
3324
3325 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3326
3327 ret = record_ust_snapshot(usess, &tmp_output, session,
3328 wait, nb_packets_per_stream);
3329 if (ret != LTTNG_OK) {
3330 rcu_read_unlock();
3331 goto error;
3332 }
3333 snapshot_success = 1;
3334 }
3335 rcu_read_unlock();
3336 }
3337 }
3338
3339 if (snapshot_success) {
3340 session->snapshot.nb_snapshot++;
3341 } else {
3342 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3343 }
3344
3345 error:
3346 return ret;
3347 }
3348
3349 /*
3350 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3351 */
3352 int cmd_set_session_shm_path(struct ltt_session *session,
3353 const char *shm_path)
3354 {
3355 /* Safety net */
3356 assert(session);
3357
3358 /*
3359 * Can only set shm path before session is started.
3360 */
3361 if (session->has_been_started) {
3362 return LTTNG_ERR_SESSION_STARTED;
3363 }
3364
3365 strncpy(session->shm_path, shm_path,
3366 sizeof(session->shm_path));
3367 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3368
3369 return 0;
3370 }
3371
3372 /*
3373 * Init command subsystem.
3374 */
3375 void cmd_init(void)
3376 {
3377 /*
3378 * Set network sequence index to 1 for streams to match a relayd
3379 * socket on the consumer side.
3380 */
3381 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3382 relayd_net_seq_idx = 1;
3383 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3384
3385 DBG("Command subsystem initialized");
3386 }
LTTng 2.0 tools and control repository
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