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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 char *filter_expression_a = NULL;
1489 struct lttng_filter_bytecode *filter_a = NULL;
1490
1491 /*
1492 * We need to duplicate filter_expression and filter,
1493 * because ownership is passed to first enable
1494 * event.
1495 */
1496 if (filter_expression) {
1497 filter_expression_a = strdup(filter_expression);
1498 if (!filter_expression_a) {
1499 ret = LTTNG_ERR_FATAL;
1500 goto error;
1501 }
1502 }
1503 if (filter) {
1504 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1505 if (!filter_a) {
1506 free(filter_expression_a);
1507 ret = LTTNG_ERR_FATAL;
1508 goto error;
1509 }
1510 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1511 }
1512 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
1513 ret = event_kernel_enable_event(kchan, event,
1514 filter_expression, filter);
1515 /* We have passed ownership */
1516 filter_expression = NULL;
1517 filter = NULL;
1518 if (ret != LTTNG_OK) {
1519 if (channel_created) {
1520 /* Let's not leak a useless channel. */
1521 kernel_destroy_channel(kchan);
1522 }
1523 free(filter_expression_a);
1524 free(filter_a);
1525 goto error;
1526 }
1527 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
1528 ret = event_kernel_enable_event(kchan, event,
1529 filter_expression_a, filter_a);
1530 if (ret != LTTNG_OK) {
1531 free(filter_expression_a);
1532 free(filter_a);
1533 goto error;
1534 }
1535 break;
1536 }
1537 case LTTNG_EVENT_PROBE:
1538 case LTTNG_EVENT_FUNCTION:
1539 case LTTNG_EVENT_FUNCTION_ENTRY:
1540 case LTTNG_EVENT_TRACEPOINT:
1541 ret = event_kernel_enable_event(kchan, event,
1542 filter_expression, filter);
1543 /* We have passed ownership */
1544 filter_expression = NULL;
1545 filter = NULL;
1546 if (ret != LTTNG_OK) {
1547 if (channel_created) {
1548 /* Let's not leak a useless channel. */
1549 kernel_destroy_channel(kchan);
1550 }
1551 goto error;
1552 }
1553 break;
1554 case LTTNG_EVENT_SYSCALL:
1555 ret = event_kernel_enable_event(kchan, event,
1556 filter_expression, filter);
1557 /* We have passed ownership */
1558 filter_expression = NULL;
1559 filter = NULL;
1560 if (ret != LTTNG_OK) {
1561 goto error;
1562 }
1563 break;
1564 default:
1565 ret = LTTNG_ERR_UNK;
1566 goto error;
1567 }
1568
1569 kernel_wait_quiescent(kernel_tracer_fd);
1570 break;
1571 }
1572 case LTTNG_DOMAIN_UST:
1573 {
1574 struct ltt_ust_channel *uchan;
1575 struct ltt_ust_session *usess = session->ust_session;
1576
1577 assert(usess);
1578
1579 /*
1580 * If a non-default channel has been created in the
1581 * session, explicitely require that -c chan_name needs
1582 * to be provided.
1583 */
1584 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1585 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1586 goto error;
1587 }
1588
1589 /* Get channel from global UST domain */
1590 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1591 channel_name);
1592 if (uchan == NULL) {
1593 /* Create default channel */
1594 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1595 usess->buffer_type);
1596 if (attr == NULL) {
1597 ret = LTTNG_ERR_FATAL;
1598 goto error;
1599 }
1600 strncpy(attr->name, channel_name, sizeof(attr->name));
1601
1602 ret = cmd_enable_channel(session, domain, attr, wpipe);
1603 if (ret != LTTNG_OK) {
1604 free(attr);
1605 goto error;
1606 }
1607 free(attr);
1608
1609 /* Get the newly created channel reference back */
1610 uchan = trace_ust_find_channel_by_name(
1611 usess->domain_global.channels, channel_name);
1612 assert(uchan);
1613 }
1614
1615 /* At this point, the session and channel exist on the tracer */
1616 ret = event_ust_enable_tracepoint(usess, uchan, event,
1617 filter_expression, filter, exclusion);
1618 /* We have passed ownership */
1619 filter_expression = NULL;
1620 filter = NULL;
1621 exclusion = NULL;
1622 if (ret != LTTNG_OK) {
1623 goto error;
1624 }
1625 break;
1626 }
1627 case LTTNG_DOMAIN_LOG4J:
1628 case LTTNG_DOMAIN_JUL:
1629 case LTTNG_DOMAIN_PYTHON:
1630 {
1631 const char *default_event_name, *default_chan_name;
1632 struct agent *agt;
1633 struct lttng_event uevent;
1634 struct lttng_domain tmp_dom;
1635 struct ltt_ust_session *usess = session->ust_session;
1636
1637 assert(usess);
1638
1639 agt = trace_ust_find_agent(usess, domain->type);
1640 if (!agt) {
1641 agt = agent_create(domain->type);
1642 if (!agt) {
1643 ret = -LTTNG_ERR_NOMEM;
1644 goto error;
1645 }
1646 agent_add(agt, usess->agents);
1647 }
1648
1649 /* Create the default tracepoint. */
1650 memset(&uevent, 0, sizeof(uevent));
1651 uevent.type = LTTNG_EVENT_TRACEPOINT;
1652 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
1653 default_event_name = event_get_default_agent_ust_name(domain->type);
1654 if (!default_event_name) {
1655 ret = -LTTNG_ERR_FATAL;
1656 goto error;
1657 }
1658 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
1659 uevent.name[sizeof(uevent.name) - 1] = '\0';
1660
1661 /*
1662 * The domain type is changed because we are about to enable the
1663 * default channel and event for the JUL domain that are hardcoded.
1664 * This happens in the UST domain.
1665 */
1666 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
1667 tmp_dom.type = LTTNG_DOMAIN_UST;
1668
1669 switch (domain->type) {
1670 case LTTNG_DOMAIN_LOG4J:
1671 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
1672 break;
1673 case LTTNG_DOMAIN_JUL:
1674 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
1675 break;
1676 case LTTNG_DOMAIN_PYTHON:
1677 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
1678 break;
1679 default:
1680 /* The switch/case we are in should avoid this else big problem */
1681 assert(0);
1682 }
1683
1684 {
1685 struct lttng_filter_bytecode *filter_copy = NULL;
1686
1687 if (filter) {
1688 filter_copy = zmalloc(
1689 sizeof(struct lttng_filter_bytecode)
1690 + filter->len);
1691 if (!filter_copy) {
1692 goto error;
1693 }
1694
1695 memcpy(filter_copy, filter,
1696 sizeof(struct lttng_filter_bytecode)
1697 + filter->len);
1698 }
1699
1700 ret = cmd_enable_event(session, &tmp_dom,
1701 (char *) default_chan_name,
1702 &uevent, filter_expression, filter_copy,
1703 NULL, wpipe);
1704 /* We have passed ownership */
1705 filter_expression = NULL;
1706 }
1707
1708 if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_ENABLED) {
1709 goto error;
1710 }
1711
1712 /* The wild card * means that everything should be enabled. */
1713 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
1714 ret = event_agent_enable_all(usess, agt, event, filter);
1715 filter = NULL;
1716 } else {
1717 ret = event_agent_enable(usess, agt, event, filter);
1718 filter = NULL;
1719 }
1720 if (ret != LTTNG_OK) {
1721 goto error;
1722 }
1723
1724 break;
1725 }
1726 default:
1727 ret = LTTNG_ERR_UND;
1728 goto error;
1729 }
1730
1731 ret = LTTNG_OK;
1732
1733 error:
1734 free(filter_expression);
1735 free(filter);
1736 free(exclusion);
1737 rcu_read_unlock();
1738 return ret;
1739 }
1740
1741 /*
1742 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
1743 */
1744 ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
1745 {
1746 int ret;
1747 ssize_t nb_events = 0;
1748
1749 switch (domain) {
1750 case LTTNG_DOMAIN_KERNEL:
1751 nb_events = kernel_list_events(kernel_tracer_fd, events);
1752 if (nb_events < 0) {
1753 ret = LTTNG_ERR_KERN_LIST_FAIL;
1754 goto error;
1755 }
1756 break;
1757 case LTTNG_DOMAIN_UST:
1758 nb_events = ust_app_list_events(events);
1759 if (nb_events < 0) {
1760 ret = LTTNG_ERR_UST_LIST_FAIL;
1761 goto error;
1762 }
1763 break;
1764 case LTTNG_DOMAIN_LOG4J:
1765 case LTTNG_DOMAIN_JUL:
1766 case LTTNG_DOMAIN_PYTHON:
1767 nb_events = agent_list_events(events, domain);
1768 if (nb_events < 0) {
1769 ret = LTTNG_ERR_UST_LIST_FAIL;
1770 goto error;
1771 }
1772 break;
1773 default:
1774 ret = LTTNG_ERR_UND;
1775 goto error;
1776 }
1777
1778 return nb_events;
1779
1780 error:
1781 /* Return negative value to differentiate return code */
1782 return -ret;
1783 }
1784
1785 /*
1786 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
1787 */
1788 ssize_t cmd_list_tracepoint_fields(int domain,
1789 struct lttng_event_field **fields)
1790 {
1791 int ret;
1792 ssize_t nb_fields = 0;
1793
1794 switch (domain) {
1795 case LTTNG_DOMAIN_UST:
1796 nb_fields = ust_app_list_event_fields(fields);
1797 if (nb_fields < 0) {
1798 ret = LTTNG_ERR_UST_LIST_FAIL;
1799 goto error;
1800 }
1801 break;
1802 case LTTNG_DOMAIN_KERNEL:
1803 default: /* fall-through */
1804 ret = LTTNG_ERR_UND;
1805 goto error;
1806 }
1807
1808 return nb_fields;
1809
1810 error:
1811 /* Return negative value to differentiate return code */
1812 return -ret;
1813 }
1814
1815 ssize_t cmd_list_syscalls(struct lttng_event **events)
1816 {
1817 return syscall_table_list(events);
1818 }
1819
1820 /*
1821 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
1822 *
1823 * Called with session lock held.
1824 */
1825 ssize_t cmd_list_tracker_pids(struct ltt_session *session,
1826 int domain, int32_t **pids)
1827 {
1828 int ret;
1829 ssize_t nr_pids = 0;
1830
1831 switch (domain) {
1832 case LTTNG_DOMAIN_KERNEL:
1833 {
1834 struct ltt_kernel_session *ksess;
1835
1836 ksess = session->kernel_session;
1837 nr_pids = kernel_list_tracker_pids(ksess, pids);
1838 if (nr_pids < 0) {
1839 ret = LTTNG_ERR_KERN_LIST_FAIL;
1840 goto error;
1841 }
1842 break;
1843 }
1844 case LTTNG_DOMAIN_UST:
1845 {
1846 struct ltt_ust_session *usess;
1847
1848 usess = session->ust_session;
1849 nr_pids = trace_ust_list_tracker_pids(usess, pids);
1850 if (nr_pids < 0) {
1851 ret = LTTNG_ERR_UST_LIST_FAIL;
1852 goto error;
1853 }
1854 break;
1855 }
1856 case LTTNG_DOMAIN_LOG4J:
1857 case LTTNG_DOMAIN_JUL:
1858 case LTTNG_DOMAIN_PYTHON:
1859 default:
1860 ret = LTTNG_ERR_UND;
1861 goto error;
1862 }
1863
1864 return nr_pids;
1865
1866 error:
1867 /* Return negative value to differentiate return code */
1868 return -ret;
1869 }
1870
1871 /*
1872 * Command LTTNG_START_TRACE processed by the client thread.
1873 *
1874 * Called with session mutex held.
1875 */
1876 int cmd_start_trace(struct ltt_session *session)
1877 {
1878 int ret;
1879 unsigned long nb_chan = 0;
1880 struct ltt_kernel_session *ksession;
1881 struct ltt_ust_session *usess;
1882
1883 assert(session);
1884
1885 /* Ease our life a bit ;) */
1886 ksession = session->kernel_session;
1887 usess = session->ust_session;
1888
1889 /* Is the session already started? */
1890 if (session->active) {
1891 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1892 goto error;
1893 }
1894
1895 /*
1896 * Starting a session without channel is useless since after that it's not
1897 * possible to enable channel thus inform the client.
1898 */
1899 if (usess && usess->domain_global.channels) {
1900 rcu_read_lock();
1901 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
1902 rcu_read_unlock();
1903 }
1904 if (ksession) {
1905 nb_chan += ksession->channel_count;
1906 }
1907 if (!nb_chan) {
1908 ret = LTTNG_ERR_NO_CHANNEL;
1909 goto error;
1910 }
1911
1912 /* Kernel tracing */
1913 if (ksession != NULL) {
1914 ret = start_kernel_session(ksession, kernel_tracer_fd);
1915 if (ret != LTTNG_OK) {
1916 goto error;
1917 }
1918 }
1919
1920 /* Flag session that trace should start automatically */
1921 if (usess) {
1922 /*
1923 * Even though the start trace might fail, flag this session active so
1924 * other application coming in are started by default.
1925 */
1926 usess->active = 1;
1927
1928 ret = ust_app_start_trace_all(usess);
1929 if (ret < 0) {
1930 ret = LTTNG_ERR_UST_START_FAIL;
1931 goto error;
1932 }
1933 }
1934
1935 /* Flag this after a successful start. */
1936 session->has_been_started = 1;
1937 session->active = 1;
1938
1939 ret = LTTNG_OK;
1940
1941 error:
1942 return ret;
1943 }
1944
1945 /*
1946 * Command LTTNG_STOP_TRACE processed by the client thread.
1947 */
1948 int cmd_stop_trace(struct ltt_session *session)
1949 {
1950 int ret;
1951 struct ltt_kernel_channel *kchan;
1952 struct ltt_kernel_session *ksession;
1953 struct ltt_ust_session *usess;
1954
1955 assert(session);
1956
1957 /* Short cut */
1958 ksession = session->kernel_session;
1959 usess = session->ust_session;
1960
1961 /* Session is not active. Skip everythong and inform the client. */
1962 if (!session->active) {
1963 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
1964 goto error;
1965 }
1966
1967 /* Kernel tracer */
1968 if (ksession && ksession->active) {
1969 DBG("Stop kernel tracing");
1970
1971 /* Flush metadata if exist */
1972 if (ksession->metadata_stream_fd >= 0) {
1973 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
1974 if (ret < 0) {
1975 ERR("Kernel metadata flush failed");
1976 }
1977 }
1978
1979 /* Flush all buffers before stopping */
1980 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
1981 ret = kernel_flush_buffer(kchan);
1982 if (ret < 0) {
1983 ERR("Kernel flush buffer error");
1984 }
1985 }
1986
1987 ret = kernel_stop_session(ksession);
1988 if (ret < 0) {
1989 ret = LTTNG_ERR_KERN_STOP_FAIL;
1990 goto error;
1991 }
1992
1993 kernel_wait_quiescent(kernel_tracer_fd);
1994
1995 ksession->active = 0;
1996 }
1997
1998 if (usess && usess->active) {
1999 /*
2000 * Even though the stop trace might fail, flag this session inactive so
2001 * other application coming in are not started by default.
2002 */
2003 usess->active = 0;
2004
2005 ret = ust_app_stop_trace_all(usess);
2006 if (ret < 0) {
2007 ret = LTTNG_ERR_UST_STOP_FAIL;
2008 goto error;
2009 }
2010 }
2011
2012 /* Flag inactive after a successful stop. */
2013 session->active = 0;
2014 ret = LTTNG_OK;
2015
2016 error:
2017 return ret;
2018 }
2019
2020 /*
2021 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2022 */
2023 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2024 struct lttng_uri *uris)
2025 {
2026 int ret, i;
2027 struct ltt_kernel_session *ksess = session->kernel_session;
2028 struct ltt_ust_session *usess = session->ust_session;
2029
2030 assert(session);
2031 assert(uris);
2032 assert(nb_uri > 0);
2033
2034 /* Can't set consumer URI if the session is active. */
2035 if (session->active) {
2036 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2037 goto error;
2038 }
2039
2040 /* Set the "global" consumer URIs */
2041 for (i = 0; i < nb_uri; i++) {
2042 ret = add_uri_to_consumer(session->consumer,
2043 &uris[i], 0, session->name);
2044 if (ret != LTTNG_OK) {
2045 goto error;
2046 }
2047 }
2048
2049 /* Set UST session URIs */
2050 if (session->ust_session) {
2051 for (i = 0; i < nb_uri; i++) {
2052 ret = add_uri_to_consumer(
2053 session->ust_session->consumer,
2054 &uris[i], LTTNG_DOMAIN_UST,
2055 session->name);
2056 if (ret != LTTNG_OK) {
2057 goto error;
2058 }
2059 }
2060 }
2061
2062 /* Set kernel session URIs */
2063 if (session->kernel_session) {
2064 for (i = 0; i < nb_uri; i++) {
2065 ret = add_uri_to_consumer(
2066 session->kernel_session->consumer,
2067 &uris[i], LTTNG_DOMAIN_KERNEL,
2068 session->name);
2069 if (ret != LTTNG_OK) {
2070 goto error;
2071 }
2072 }
2073 }
2074
2075 /*
2076 * Make sure to set the session in output mode after we set URI since a
2077 * session can be created without URL (thus flagged in no output mode).
2078 */
2079 session->output_traces = 1;
2080 if (ksess) {
2081 ksess->output_traces = 1;
2082 }
2083
2084 if (usess) {
2085 usess->output_traces = 1;
2086 }
2087
2088 /* All good! */
2089 ret = LTTNG_OK;
2090
2091 error:
2092 return ret;
2093 }
2094
2095 /*
2096 * Command LTTNG_CREATE_SESSION processed by the client thread.
2097 */
2098 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2099 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2100 {
2101 int ret;
2102 struct ltt_session *session;
2103
2104 assert(name);
2105 assert(creds);
2106
2107 /*
2108 * Verify if the session already exist
2109 *
2110 * XXX: There is no need for the session lock list here since the caller
2111 * (process_client_msg) is holding it. We might want to change that so a
2112 * single command does not lock the entire session list.
2113 */
2114 session = session_find_by_name(name);
2115 if (session != NULL) {
2116 ret = LTTNG_ERR_EXIST_SESS;
2117 goto find_error;
2118 }
2119
2120 /* Create tracing session in the registry */
2121 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2122 LTTNG_SOCK_GET_GID_CRED(creds));
2123 if (ret != LTTNG_OK) {
2124 goto session_error;
2125 }
2126
2127 /*
2128 * Get the newly created session pointer back
2129 *
2130 * XXX: There is no need for the session lock list here since the caller
2131 * (process_client_msg) is holding it. We might want to change that so a
2132 * single command does not lock the entire session list.
2133 */
2134 session = session_find_by_name(name);
2135 assert(session);
2136
2137 session->live_timer = live_timer;
2138 /* Create default consumer output for the session not yet created. */
2139 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2140 if (session->consumer == NULL) {
2141 ret = LTTNG_ERR_FATAL;
2142 goto consumer_error;
2143 }
2144
2145 if (uris) {
2146 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2147 if (ret != LTTNG_OK) {
2148 goto consumer_error;
2149 }
2150 session->output_traces = 1;
2151 } else {
2152 session->output_traces = 0;
2153 DBG2("Session %s created with no output", session->name);
2154 }
2155
2156 session->consumer->enabled = 1;
2157
2158 return LTTNG_OK;
2159
2160 consumer_error:
2161 session_destroy(session);
2162 session_error:
2163 find_error:
2164 return ret;
2165 }
2166
2167 /*
2168 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2169 */
2170 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2171 size_t nb_uri, lttng_sock_cred *creds)
2172 {
2173 int ret;
2174 struct ltt_session *session;
2175 struct snapshot_output *new_output = NULL;
2176
2177 assert(name);
2178 assert(creds);
2179
2180 /*
2181 * Create session in no output mode with URIs set to NULL. The uris we've
2182 * received are for a default snapshot output if one.
2183 */
2184 ret = cmd_create_session_uri(name, NULL, 0, creds, -1);
2185 if (ret != LTTNG_OK) {
2186 goto error;
2187 }
2188
2189 /* Get the newly created session pointer back. This should NEVER fail. */
2190 session = session_find_by_name(name);
2191 assert(session);
2192
2193 /* Flag session for snapshot mode. */
2194 session->snapshot_mode = 1;
2195
2196 /* Skip snapshot output creation if no URI is given. */
2197 if (nb_uri == 0) {
2198 goto end;
2199 }
2200
2201 new_output = snapshot_output_alloc();
2202 if (!new_output) {
2203 ret = LTTNG_ERR_NOMEM;
2204 goto error_snapshot_alloc;
2205 }
2206
2207 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2208 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2209 if (ret < 0) {
2210 if (ret == -ENOMEM) {
2211 ret = LTTNG_ERR_NOMEM;
2212 } else {
2213 ret = LTTNG_ERR_INVALID;
2214 }
2215 goto error_snapshot;
2216 }
2217
2218 rcu_read_lock();
2219 snapshot_add_output(&session->snapshot, new_output);
2220 rcu_read_unlock();
2221
2222 end:
2223 return LTTNG_OK;
2224
2225 error_snapshot:
2226 snapshot_output_destroy(new_output);
2227 error_snapshot_alloc:
2228 session_destroy(session);
2229 error:
2230 return ret;
2231 }
2232
2233 /*
2234 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2235 *
2236 * Called with session lock held.
2237 */
2238 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2239 {
2240 int ret;
2241 struct ltt_ust_session *usess;
2242 struct ltt_kernel_session *ksess;
2243
2244 /* Safety net */
2245 assert(session);
2246
2247 usess = session->ust_session;
2248 ksess = session->kernel_session;
2249
2250 /* Clean kernel session teardown */
2251 kernel_destroy_session(ksess);
2252
2253 /* UST session teardown */
2254 if (usess) {
2255 /* Close any relayd session */
2256 consumer_output_send_destroy_relayd(usess->consumer);
2257
2258 /* Destroy every UST application related to this session. */
2259 ret = ust_app_destroy_trace_all(usess);
2260 if (ret) {
2261 ERR("Error in ust_app_destroy_trace_all");
2262 }
2263
2264 /* Clean up the rest. */
2265 trace_ust_destroy_session(usess);
2266 }
2267
2268 /*
2269 * Must notify the kernel thread here to update it's poll set in order to
2270 * remove the channel(s)' fd just destroyed.
2271 */
2272 ret = notify_thread_pipe(wpipe);
2273 if (ret < 0) {
2274 PERROR("write kernel poll pipe");
2275 }
2276
2277 ret = session_destroy(session);
2278
2279 return ret;
2280 }
2281
2282 /*
2283 * Command LTTNG_CALIBRATE processed by the client thread.
2284 */
2285 int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2286 {
2287 int ret;
2288
2289 switch (domain) {
2290 case LTTNG_DOMAIN_KERNEL:
2291 {
2292 struct lttng_kernel_calibrate kcalibrate;
2293
2294 switch (calibrate->type) {
2295 case LTTNG_CALIBRATE_FUNCTION:
2296 default:
2297 /* Default and only possible calibrate option. */
2298 kcalibrate.type = LTTNG_KERNEL_CALIBRATE_KRETPROBE;
2299 break;
2300 }
2301
2302 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2303 if (ret < 0) {
2304 ret = LTTNG_ERR_KERN_ENABLE_FAIL;
2305 goto error;
2306 }
2307 break;
2308 }
2309 case LTTNG_DOMAIN_UST:
2310 {
2311 struct lttng_ust_calibrate ucalibrate;
2312
2313 switch (calibrate->type) {
2314 case LTTNG_CALIBRATE_FUNCTION:
2315 default:
2316 /* Default and only possible calibrate option. */
2317 ucalibrate.type = LTTNG_UST_CALIBRATE_TRACEPOINT;
2318 break;
2319 }
2320
2321 ret = ust_app_calibrate_glb(&ucalibrate);
2322 if (ret < 0) {
2323 ret = LTTNG_ERR_UST_CALIBRATE_FAIL;
2324 goto error;
2325 }
2326 break;
2327 }
2328 default:
2329 ret = LTTNG_ERR_UND;
2330 goto error;
2331 }
2332
2333 ret = LTTNG_OK;
2334
2335 error:
2336 return ret;
2337 }
2338
2339 /*
2340 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2341 */
2342 int cmd_register_consumer(struct ltt_session *session, int domain,
2343 const char *sock_path, struct consumer_data *cdata)
2344 {
2345 int ret, sock;
2346 struct consumer_socket *socket = NULL;
2347
2348 assert(session);
2349 assert(cdata);
2350 assert(sock_path);
2351
2352 switch (domain) {
2353 case LTTNG_DOMAIN_KERNEL:
2354 {
2355 struct ltt_kernel_session *ksess = session->kernel_session;
2356
2357 assert(ksess);
2358
2359 /* Can't register a consumer if there is already one */
2360 if (ksess->consumer_fds_sent != 0) {
2361 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2362 goto error;
2363 }
2364
2365 sock = lttcomm_connect_unix_sock(sock_path);
2366 if (sock < 0) {
2367 ret = LTTNG_ERR_CONNECT_FAIL;
2368 goto error;
2369 }
2370 cdata->cmd_sock = sock;
2371
2372 socket = consumer_allocate_socket(&cdata->cmd_sock);
2373 if (socket == NULL) {
2374 ret = close(sock);
2375 if (ret < 0) {
2376 PERROR("close register consumer");
2377 }
2378 cdata->cmd_sock = -1;
2379 ret = LTTNG_ERR_FATAL;
2380 goto error;
2381 }
2382
2383 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2384 if (socket->lock == NULL) {
2385 PERROR("zmalloc pthread mutex");
2386 ret = LTTNG_ERR_FATAL;
2387 goto error;
2388 }
2389 pthread_mutex_init(socket->lock, NULL);
2390 socket->registered = 1;
2391
2392 rcu_read_lock();
2393 consumer_add_socket(socket, ksess->consumer);
2394 rcu_read_unlock();
2395
2396 pthread_mutex_lock(&cdata->pid_mutex);
2397 cdata->pid = -1;
2398 pthread_mutex_unlock(&cdata->pid_mutex);
2399
2400 break;
2401 }
2402 default:
2403 /* TODO: Userspace tracing */
2404 ret = LTTNG_ERR_UND;
2405 goto error;
2406 }
2407
2408 return LTTNG_OK;
2409
2410 error:
2411 if (socket) {
2412 consumer_destroy_socket(socket);
2413 }
2414 return ret;
2415 }
2416
2417 /*
2418 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2419 */
2420 ssize_t cmd_list_domains(struct ltt_session *session,
2421 struct lttng_domain **domains)
2422 {
2423 int ret, index = 0;
2424 ssize_t nb_dom = 0;
2425 struct agent *agt;
2426 struct lttng_ht_iter iter;
2427
2428 if (session->kernel_session != NULL) {
2429 DBG3("Listing domains found kernel domain");
2430 nb_dom++;
2431 }
2432
2433 if (session->ust_session != NULL) {
2434 DBG3("Listing domains found UST global domain");
2435 nb_dom++;
2436
2437 rcu_read_lock();
2438 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2439 agt, node.node) {
2440 if (agt->being_used) {
2441 nb_dom++;
2442 }
2443 }
2444 rcu_read_unlock();
2445 }
2446
2447 if (!nb_dom) {
2448 goto end;
2449 }
2450
2451 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2452 if (*domains == NULL) {
2453 ret = LTTNG_ERR_FATAL;
2454 goto error;
2455 }
2456
2457 if (session->kernel_session != NULL) {
2458 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2459
2460 /* Kernel session buffer type is always GLOBAL */
2461 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2462
2463 index++;
2464 }
2465
2466 if (session->ust_session != NULL) {
2467 (*domains)[index].type = LTTNG_DOMAIN_UST;
2468 (*domains)[index].buf_type = session->ust_session->buffer_type;
2469 index++;
2470
2471 rcu_read_lock();
2472 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2473 agt, node.node) {
2474 if (agt->being_used) {
2475 (*domains)[index].type = agt->domain;
2476 (*domains)[index].buf_type = session->ust_session->buffer_type;
2477 index++;
2478 }
2479 }
2480 rcu_read_unlock();
2481 }
2482 end:
2483 return nb_dom;
2484
2485 error:
2486 /* Return negative value to differentiate return code */
2487 return -ret;
2488 }
2489
2490
2491 /*
2492 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2493 */
2494 ssize_t cmd_list_channels(int domain, struct ltt_session *session,
2495 struct lttng_channel **channels)
2496 {
2497 int ret;
2498 ssize_t nb_chan = 0;
2499
2500 switch (domain) {
2501 case LTTNG_DOMAIN_KERNEL:
2502 if (session->kernel_session != NULL) {
2503 nb_chan = session->kernel_session->channel_count;
2504 }
2505 DBG3("Number of kernel channels %zd", nb_chan);
2506 if (nb_chan <= 0) {
2507 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2508 }
2509 break;
2510 case LTTNG_DOMAIN_UST:
2511 if (session->ust_session != NULL) {
2512 rcu_read_lock();
2513 nb_chan = lttng_ht_get_count(
2514 session->ust_session->domain_global.channels);
2515 rcu_read_unlock();
2516 }
2517 DBG3("Number of UST global channels %zd", nb_chan);
2518 if (nb_chan < 0) {
2519 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
2520 goto error;
2521 }
2522 break;
2523 default:
2524 ret = LTTNG_ERR_UND;
2525 goto error;
2526 }
2527
2528 if (nb_chan > 0) {
2529 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
2530 if (*channels == NULL) {
2531 ret = LTTNG_ERR_FATAL;
2532 goto error;
2533 }
2534
2535 list_lttng_channels(domain, session, *channels);
2536 }
2537
2538 return nb_chan;
2539
2540 error:
2541 /* Return negative value to differentiate return code */
2542 return -ret;
2543 }
2544
2545 /*
2546 * Command LTTNG_LIST_EVENTS processed by the client thread.
2547 */
2548 ssize_t cmd_list_events(int domain, struct ltt_session *session,
2549 char *channel_name, struct lttng_event **events)
2550 {
2551 int ret = 0;
2552 ssize_t nb_event = 0;
2553
2554 switch (domain) {
2555 case LTTNG_DOMAIN_KERNEL:
2556 if (session->kernel_session != NULL) {
2557 nb_event = list_lttng_kernel_events(channel_name,
2558 session->kernel_session, events);
2559 }
2560 break;
2561 case LTTNG_DOMAIN_UST:
2562 {
2563 if (session->ust_session != NULL) {
2564 nb_event = list_lttng_ust_global_events(channel_name,
2565 &session->ust_session->domain_global, events);
2566 }
2567 break;
2568 }
2569 case LTTNG_DOMAIN_LOG4J:
2570 case LTTNG_DOMAIN_JUL:
2571 case LTTNG_DOMAIN_PYTHON:
2572 if (session->ust_session) {
2573 struct lttng_ht_iter iter;
2574 struct agent *agt;
2575
2576 rcu_read_lock();
2577 cds_lfht_for_each_entry(session->ust_session->agents->ht,
2578 &iter.iter, agt, node.node) {
2579 nb_event = list_lttng_agent_events(agt, events);
2580 }
2581 rcu_read_unlock();
2582 }
2583 break;
2584 default:
2585 ret = LTTNG_ERR_UND;
2586 goto error;
2587 }
2588
2589 return nb_event;
2590
2591 error:
2592 /* Return negative value to differentiate return code */
2593 return -ret;
2594 }
2595
2596 /*
2597 * Using the session list, filled a lttng_session array to send back to the
2598 * client for session listing.
2599 *
2600 * The session list lock MUST be acquired before calling this function. Use
2601 * session_lock_list() and session_unlock_list().
2602 */
2603 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
2604 gid_t gid)
2605 {
2606 int ret;
2607 unsigned int i = 0;
2608 struct ltt_session *session;
2609 struct ltt_session_list *list = session_get_list();
2610
2611 DBG("Getting all available session for UID %d GID %d",
2612 uid, gid);
2613 /*
2614 * Iterate over session list and append data after the control struct in
2615 * the buffer.
2616 */
2617 cds_list_for_each_entry(session, &list->head, list) {
2618 /*
2619 * Only list the sessions the user can control.
2620 */
2621 if (!session_access_ok(session, uid, gid)) {
2622 continue;
2623 }
2624
2625 struct ltt_kernel_session *ksess = session->kernel_session;
2626 struct ltt_ust_session *usess = session->ust_session;
2627
2628 if (session->consumer->type == CONSUMER_DST_NET ||
2629 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
2630 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
2631 ret = build_network_session_path(sessions[i].path,
2632 sizeof(sessions[i].path), session);
2633 } else {
2634 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
2635 session->consumer->dst.trace_path);
2636 }
2637 if (ret < 0) {
2638 PERROR("snprintf session path");
2639 continue;
2640 }
2641
2642 strncpy(sessions[i].name, session->name, NAME_MAX);
2643 sessions[i].name[NAME_MAX - 1] = '\0';
2644 sessions[i].enabled = session->active;
2645 sessions[i].snapshot_mode = session->snapshot_mode;
2646 sessions[i].live_timer_interval = session->live_timer;
2647 i++;
2648 }
2649 }
2650
2651 /*
2652 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
2653 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
2654 */
2655 int cmd_data_pending(struct ltt_session *session)
2656 {
2657 int ret;
2658 struct ltt_kernel_session *ksess = session->kernel_session;
2659 struct ltt_ust_session *usess = session->ust_session;
2660
2661 assert(session);
2662
2663 /* Session MUST be stopped to ask for data availability. */
2664 if (session->active) {
2665 ret = LTTNG_ERR_SESSION_STARTED;
2666 goto error;
2667 } else {
2668 /*
2669 * If stopped, just make sure we've started before else the above call
2670 * will always send that there is data pending.
2671 *
2672 * The consumer assumes that when the data pending command is received,
2673 * the trace has been started before or else no output data is written
2674 * by the streams which is a condition for data pending. So, this is
2675 * *VERY* important that we don't ask the consumer before a start
2676 * trace.
2677 */
2678 if (!session->has_been_started) {
2679 ret = 0;
2680 goto error;
2681 }
2682 }
2683
2684 if (ksess && ksess->consumer) {
2685 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
2686 if (ret == 1) {
2687 /* Data is still being extracted for the kernel. */
2688 goto error;
2689 }
2690 }
2691
2692 if (usess && usess->consumer) {
2693 ret = consumer_is_data_pending(usess->id, usess->consumer);
2694 if (ret == 1) {
2695 /* Data is still being extracted for the kernel. */
2696 goto error;
2697 }
2698 }
2699
2700 /* Data is ready to be read by a viewer */
2701 ret = 0;
2702
2703 error:
2704 return ret;
2705 }
2706
2707 /*
2708 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
2709 *
2710 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2711 */
2712 int cmd_snapshot_add_output(struct ltt_session *session,
2713 struct lttng_snapshot_output *output, uint32_t *id)
2714 {
2715 int ret;
2716 struct snapshot_output *new_output;
2717
2718 assert(session);
2719 assert(output);
2720
2721 DBG("Cmd snapshot add output for session %s", session->name);
2722
2723 /*
2724 * Permission denied to create an output if the session is not
2725 * set in no output mode.
2726 */
2727 if (session->output_traces) {
2728 ret = LTTNG_ERR_EPERM;
2729 goto error;
2730 }
2731
2732 /* Only one output is allowed until we have the "tee" feature. */
2733 if (session->snapshot.nb_output == 1) {
2734 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
2735 goto error;
2736 }
2737
2738 new_output = snapshot_output_alloc();
2739 if (!new_output) {
2740 ret = LTTNG_ERR_NOMEM;
2741 goto error;
2742 }
2743
2744 ret = snapshot_output_init(output->max_size, output->name,
2745 output->ctrl_url, output->data_url, session->consumer, new_output,
2746 &session->snapshot);
2747 if (ret < 0) {
2748 if (ret == -ENOMEM) {
2749 ret = LTTNG_ERR_NOMEM;
2750 } else {
2751 ret = LTTNG_ERR_INVALID;
2752 }
2753 goto free_error;
2754 }
2755
2756 rcu_read_lock();
2757 snapshot_add_output(&session->snapshot, new_output);
2758 if (id) {
2759 *id = new_output->id;
2760 }
2761 rcu_read_unlock();
2762
2763 return LTTNG_OK;
2764
2765 free_error:
2766 snapshot_output_destroy(new_output);
2767 error:
2768 return ret;
2769 }
2770
2771 /*
2772 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
2773 *
2774 * Return LTTNG_OK on success or else a LTTNG_ERR code.
2775 */
2776 int cmd_snapshot_del_output(struct ltt_session *session,
2777 struct lttng_snapshot_output *output)
2778 {
2779 int ret;
2780 struct snapshot_output *sout = NULL;
2781
2782 assert(session);
2783 assert(output);
2784
2785 rcu_read_lock();
2786
2787 /*
2788 * Permission denied to create an output if the session is not
2789 * set in no output mode.
2790 */
2791 if (session->output_traces) {
2792 ret = LTTNG_ERR_EPERM;
2793 goto error;
2794 }
2795
2796 if (output->id) {
2797 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
2798 session->name);
2799 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
2800 } else if (*output->name != '\0') {
2801 DBG("Cmd snapshot del output name %s for session %s", output->name,
2802 session->name);
2803 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
2804 }
2805 if (!sout) {
2806 ret = LTTNG_ERR_INVALID;
2807 goto error;
2808 }
2809
2810 snapshot_delete_output(&session->snapshot, sout);
2811 snapshot_output_destroy(sout);
2812 ret = LTTNG_OK;
2813
2814 error:
2815 rcu_read_unlock();
2816 return ret;
2817 }
2818
2819 /*
2820 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
2821 *
2822 * If no output is available, outputs is untouched and 0 is returned.
2823 *
2824 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
2825 */
2826 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
2827 struct lttng_snapshot_output **outputs)
2828 {
2829 int ret, idx = 0;
2830 struct lttng_snapshot_output *list = NULL;
2831 struct lttng_ht_iter iter;
2832 struct snapshot_output *output;
2833
2834 assert(session);
2835 assert(outputs);
2836
2837 DBG("Cmd snapshot list outputs for session %s", session->name);
2838
2839 /*
2840 * Permission denied to create an output if the session is not
2841 * set in no output mode.
2842 */
2843 if (session->output_traces) {
2844 ret = -LTTNG_ERR_EPERM;
2845 goto error;
2846 }
2847
2848 if (session->snapshot.nb_output == 0) {
2849 ret = 0;
2850 goto error;
2851 }
2852
2853 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
2854 if (!list) {
2855 ret = -LTTNG_ERR_NOMEM;
2856 goto error;
2857 }
2858
2859 /* Copy list from session to the new list object. */
2860 rcu_read_lock();
2861 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
2862 output, node.node) {
2863 assert(output->consumer);
2864 list[idx].id = output->id;
2865 list[idx].max_size = output->max_size;
2866 strncpy(list[idx].name, output->name, sizeof(list[idx].name));
2867 if (output->consumer->type == CONSUMER_DST_LOCAL) {
2868 strncpy(list[idx].ctrl_url, output->consumer->dst.trace_path,
2869 sizeof(list[idx].ctrl_url));
2870 } else {
2871 /* Control URI. */
2872 ret = uri_to_str_url(&output->consumer->dst.net.control,
2873 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
2874 if (ret < 0) {
2875 ret = -LTTNG_ERR_NOMEM;
2876 goto error;
2877 }
2878
2879 /* Data URI. */
2880 ret = uri_to_str_url(&output->consumer->dst.net.data,
2881 list[idx].data_url, sizeof(list[idx].data_url));
2882 if (ret < 0) {
2883 ret = -LTTNG_ERR_NOMEM;
2884 goto error;
2885 }
2886 }
2887 idx++;
2888 }
2889
2890 *outputs = list;
2891 list = NULL;
2892 ret = session->snapshot.nb_output;
2893 error:
2894 free(list);
2895 rcu_read_unlock();
2896 return ret;
2897 }
2898
2899 /*
2900 * Send relayd sockets from snapshot output to consumer. Ignore request if the
2901 * snapshot output is *not* set with a remote destination.
2902 *
2903 * Return 0 on success or a LTTNG_ERR code.
2904 */
2905 static int set_relayd_for_snapshot(struct consumer_output *consumer,
2906 struct snapshot_output *snap_output, struct ltt_session *session)
2907 {
2908 int ret = LTTNG_OK;
2909 struct lttng_ht_iter iter;
2910 struct consumer_socket *socket;
2911
2912 assert(consumer);
2913 assert(snap_output);
2914 assert(session);
2915
2916 DBG2("Set relayd object from snapshot output");
2917
2918 /* Ignore if snapshot consumer output is not network. */
2919 if (snap_output->consumer->type != CONSUMER_DST_NET) {
2920 goto error;
2921 }
2922
2923 /*
2924 * For each consumer socket, create and send the relayd object of the
2925 * snapshot output.
2926 */
2927 rcu_read_lock();
2928 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
2929 socket, node.node) {
2930 ret = send_consumer_relayd_sockets(0, session->id,
2931 snap_output->consumer, socket,
2932 session->name, session->hostname,
2933 session->live_timer);
2934 if (ret != LTTNG_OK) {
2935 rcu_read_unlock();
2936 goto error;
2937 }
2938 }
2939 rcu_read_unlock();
2940
2941 error:
2942 return ret;
2943 }
2944
2945 /*
2946 * Record a kernel snapshot.
2947 *
2948 * Return LTTNG_OK on success or a LTTNG_ERR code.
2949 */
2950 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
2951 struct snapshot_output *output, struct ltt_session *session,
2952 int wait, uint64_t nb_packets_per_stream)
2953 {
2954 int ret;
2955
2956 assert(ksess);
2957 assert(output);
2958 assert(session);
2959
2960 /* Get the datetime for the snapshot output directory. */
2961 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
2962 sizeof(output->datetime));
2963 if (!ret) {
2964 ret = LTTNG_ERR_INVALID;
2965 goto error;
2966 }
2967
2968 /*
2969 * Copy kernel session sockets so we can communicate with the right
2970 * consumer for the snapshot record command.
2971 */
2972 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
2973 if (ret < 0) {
2974 ret = LTTNG_ERR_NOMEM;
2975 goto error;
2976 }
2977
2978 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
2979 if (ret != LTTNG_OK) {
2980 goto error_snapshot;
2981 }
2982
2983 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
2984 if (ret != LTTNG_OK) {
2985 goto error_snapshot;
2986 }
2987
2988 ret = LTTNG_OK;
2989 goto end;
2990
2991 error_snapshot:
2992 /* Clean up copied sockets so this output can use some other later on. */
2993 consumer_destroy_output_sockets(output->consumer);
2994 error:
2995 end:
2996 return ret;
2997 }
2998
2999 /*
3000 * Record a UST snapshot.
3001 *
3002 * Return 0 on success or a LTTNG_ERR error code.
3003 */
3004 static int record_ust_snapshot(struct ltt_ust_session *usess,
3005 struct snapshot_output *output, struct ltt_session *session,
3006 int wait, uint64_t nb_packets_per_stream)
3007 {
3008 int ret;
3009
3010 assert(usess);
3011 assert(output);
3012 assert(session);
3013
3014 /* Get the datetime for the snapshot output directory. */
3015 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", output->datetime,
3016 sizeof(output->datetime));
3017 if (!ret) {
3018 ret = LTTNG_ERR_INVALID;
3019 goto error;
3020 }
3021
3022 /*
3023 * Copy UST session sockets so we can communicate with the right
3024 * consumer for the snapshot record command.
3025 */
3026 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3027 if (ret < 0) {
3028 ret = LTTNG_ERR_NOMEM;
3029 goto error;
3030 }
3031
3032 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3033 if (ret != LTTNG_OK) {
3034 goto error_snapshot;
3035 }
3036
3037 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
3038 if (ret < 0) {
3039 switch (-ret) {
3040 case EINVAL:
3041 ret = LTTNG_ERR_INVALID;
3042 break;
3043 case ENODATA:
3044 ret = LTTNG_ERR_SNAPSHOT_NODATA;
3045 break;
3046 default:
3047 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3048 break;
3049 }
3050 goto error_snapshot;
3051 }
3052
3053 ret = LTTNG_OK;
3054
3055 error_snapshot:
3056 /* Clean up copied sockets so this output can use some other later on. */
3057 consumer_destroy_output_sockets(output->consumer);
3058 error:
3059 return ret;
3060 }
3061
3062 static
3063 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3064 uint64_t cur_nr_packets)
3065 {
3066 uint64_t tot_size = 0;
3067
3068 if (session->kernel_session) {
3069 struct ltt_kernel_channel *chan;
3070 struct ltt_kernel_session *ksess = session->kernel_session;
3071
3072 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3073 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3074 /*
3075 * Don't take channel into account if we
3076 * already grab all its packets.
3077 */
3078 continue;
3079 }
3080 tot_size += chan->channel->attr.subbuf_size
3081 * chan->stream_count;
3082 }
3083 }
3084
3085 if (session->ust_session) {
3086 struct ltt_ust_session *usess = session->ust_session;
3087
3088 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3089 cur_nr_packets);
3090 }
3091
3092 return tot_size;
3093 }
3094
3095 /*
3096 * Calculate the number of packets we can grab from each stream that
3097 * fits within the overall snapshot max size.
3098 *
3099 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3100 * the number of packets per stream.
3101 *
3102 * TODO: this approach is not perfect: we consider the worse case
3103 * (packet filling the sub-buffers) as an upper bound, but we could do
3104 * better if we do this calculation while we actually grab the packet
3105 * content: we would know how much padding we don't actually store into
3106 * the file.
3107 *
3108 * This algorithm is currently bounded by the number of packets per
3109 * stream.
3110 *
3111 * Since we call this algorithm before actually grabbing the data, it's
3112 * an approximation: for instance, applications could appear/disappear
3113 * in between this call and actually grabbing data.
3114 */
3115 static
3116 int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
3117 {
3118 int64_t size_left;
3119 uint64_t cur_nb_packets = 0;
3120
3121 if (!max_size) {
3122 return 0; /* Infinite */
3123 }
3124
3125 size_left = max_size;
3126 for (;;) {
3127 uint64_t one_more_packet_tot_size;
3128
3129 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3130 cur_nb_packets);
3131 if (!one_more_packet_tot_size) {
3132 /* We are already grabbing all packets. */
3133 break;
3134 }
3135 size_left -= one_more_packet_tot_size;
3136 if (size_left < 0) {
3137 break;
3138 }
3139 cur_nb_packets++;
3140 }
3141 if (!cur_nb_packets) {
3142 /* Not enough room to grab one packet of each stream, error. */
3143 return -1;
3144 }
3145 return cur_nb_packets;
3146 }
3147
3148 /*
3149 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3150 *
3151 * The wait parameter is ignored so this call always wait for the snapshot to
3152 * complete before returning.
3153 *
3154 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3155 */
3156 int cmd_snapshot_record(struct ltt_session *session,
3157 struct lttng_snapshot_output *output, int wait)
3158 {
3159 int ret = LTTNG_OK;
3160 unsigned int use_tmp_output = 0;
3161 struct snapshot_output tmp_output;
3162 unsigned int snapshot_success = 0;
3163
3164 assert(session);
3165 assert(output);
3166
3167 DBG("Cmd snapshot record for session %s", session->name);
3168
3169 /*
3170 * Permission denied to create an output if the session is not
3171 * set in no output mode.
3172 */
3173 if (session->output_traces) {
3174 ret = LTTNG_ERR_EPERM;
3175 goto error;
3176 }
3177
3178 /* The session needs to be started at least once. */
3179 if (!session->has_been_started) {
3180 ret = LTTNG_ERR_START_SESSION_ONCE;
3181 goto error;
3182 }
3183
3184 /* Use temporary output for the session. */
3185 if (*output->ctrl_url != '\0') {
3186 ret = snapshot_output_init(output->max_size, output->name,
3187 output->ctrl_url, output->data_url, session->consumer,
3188 &tmp_output, NULL);
3189 if (ret < 0) {
3190 if (ret == -ENOMEM) {
3191 ret = LTTNG_ERR_NOMEM;
3192 } else {
3193 ret = LTTNG_ERR_INVALID;
3194 }
3195 goto error;
3196 }
3197 /* Use the global session count for the temporary snapshot. */
3198 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3199 use_tmp_output = 1;
3200 }
3201
3202 if (session->kernel_session) {
3203 struct ltt_kernel_session *ksess = session->kernel_session;
3204
3205 if (use_tmp_output) {
3206 int64_t nb_packets_per_stream;
3207
3208 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3209 tmp_output.max_size);
3210 if (nb_packets_per_stream < 0) {
3211 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3212 goto error;
3213 }
3214 ret = record_kernel_snapshot(ksess, &tmp_output, session,
3215 wait, nb_packets_per_stream);
3216 if (ret != LTTNG_OK) {
3217 goto error;
3218 }
3219 snapshot_success = 1;
3220 } else {
3221 struct snapshot_output *sout;
3222 struct lttng_ht_iter iter;
3223
3224 rcu_read_lock();
3225 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3226 &iter.iter, sout, node.node) {
3227 int64_t nb_packets_per_stream;
3228
3229 /*
3230 * Make a local copy of the output and assign the possible
3231 * temporary value given by the caller.
3232 */
3233 memset(&tmp_output, 0, sizeof(tmp_output));
3234 memcpy(&tmp_output, sout, sizeof(tmp_output));
3235
3236 if (output->max_size != (uint64_t) -1ULL) {
3237 tmp_output.max_size = output->max_size;
3238 }
3239
3240 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3241 tmp_output.max_size);
3242 if (nb_packets_per_stream < 0) {
3243 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3244 goto error;
3245 }
3246
3247 /* Use temporary name. */
3248 if (*output->name != '\0') {
3249 strncpy(tmp_output.name, output->name,
3250 sizeof(tmp_output.name));
3251 }
3252
3253 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3254
3255 ret = record_kernel_snapshot(ksess, &tmp_output,
3256 session, wait, nb_packets_per_stream);
3257 if (ret != LTTNG_OK) {
3258 rcu_read_unlock();
3259 goto error;
3260 }
3261 snapshot_success = 1;
3262 }
3263 rcu_read_unlock();
3264 }
3265 }
3266
3267 if (session->ust_session) {
3268 struct ltt_ust_session *usess = session->ust_session;
3269
3270 if (use_tmp_output) {
3271 int64_t nb_packets_per_stream;
3272
3273 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3274 tmp_output.max_size);
3275 if (nb_packets_per_stream < 0) {
3276 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3277 goto error;
3278 }
3279 ret = record_ust_snapshot(usess, &tmp_output, session,
3280 wait, nb_packets_per_stream);
3281 if (ret != LTTNG_OK) {
3282 goto error;
3283 }
3284 snapshot_success = 1;
3285 } else {
3286 struct snapshot_output *sout;
3287 struct lttng_ht_iter iter;
3288
3289 rcu_read_lock();
3290 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3291 &iter.iter, sout, node.node) {
3292 int64_t nb_packets_per_stream;
3293
3294 /*
3295 * Make a local copy of the output and assign the possible
3296 * temporary value given by the caller.
3297 */
3298 memset(&tmp_output, 0, sizeof(tmp_output));
3299 memcpy(&tmp_output, sout, sizeof(tmp_output));
3300
3301 if (output->max_size != (uint64_t) -1ULL) {
3302 tmp_output.max_size = output->max_size;
3303 }
3304
3305 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3306 tmp_output.max_size);
3307 if (nb_packets_per_stream < 0) {
3308 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3309 rcu_read_unlock();
3310 goto error;
3311 }
3312
3313 /* Use temporary name. */
3314 if (*output->name != '\0') {
3315 strncpy(tmp_output.name, output->name,
3316 sizeof(tmp_output.name));
3317 }
3318
3319 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3320
3321 ret = record_ust_snapshot(usess, &tmp_output, session,
3322 wait, nb_packets_per_stream);
3323 if (ret != LTTNG_OK) {
3324 rcu_read_unlock();
3325 goto error;
3326 }
3327 snapshot_success = 1;
3328 }
3329 rcu_read_unlock();
3330 }
3331 }
3332
3333 if (snapshot_success) {
3334 session->snapshot.nb_snapshot++;
3335 } else {
3336 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3337 }
3338
3339 error:
3340 return ret;
3341 }
3342
3343 /*
3344 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3345 */
3346 int cmd_set_session_shm_path(struct ltt_session *session,
3347 const char *shm_path)
3348 {
3349 /* Safety net */
3350 assert(session);
3351
3352 /*
3353 * Can only set shm path before session is started.
3354 */
3355 if (session->has_been_started) {
3356 return LTTNG_ERR_SESSION_STARTED;
3357 }
3358
3359 strncpy(session->shm_path, shm_path,
3360 sizeof(session->shm_path));
3361 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3362
3363 return 0;
3364 }
3365
3366 /*
3367 * Init command subsystem.
3368 */
3369 void cmd_init(void)
3370 {
3371 /*
3372 * Set network sequence index to 1 for streams to match a relayd
3373 * socket on the consumer side.
3374 */
3375 pthread_mutex_lock(&relayd_net_seq_idx_lock);
3376 relayd_net_seq_idx = 1;
3377 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
3378
3379 DBG("Command subsystem initialized");
3380 }
LTTng 2.0 tools and control repository
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