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