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