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Fix: lttng list of channels should return errors
[lttng-tools.git] / src / bin / lttng-sessiond / cmd.c
1 /*
2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License, version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 51
16 * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #define _LGPL_SOURCE
20 #include <assert.h>
21 #include <inttypes.h>
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
24
25 #include <common/defaults.h>
26 #include <common/common.h>
27 #include <common/sessiond-comm/sessiond-comm.h>
28 #include <common/relayd/relayd.h>
29 #include <common/utils.h>
30 #include <common/compat/string.h>
31 #include <common/kernel-ctl/kernel-ctl.h>
32
33 #include "channel.h"
34 #include "consumer.h"
35 #include "event.h"
36 #include "health-sessiond.h"
37 #include "kernel.h"
38 #include "kernel-consumer.h"
39 #include "lttng-sessiond.h"
40 #include "utils.h"
41 #include "syscall.h"
42 #include "agent.h"
43 #include "buffer-registry.h"
44
45 #include "cmd.h"
46
47 /*
48 * Used to keep a unique index for each relayd socket created where this value
49 * is associated with streams on the consumer so it can match the right relayd
50 * to send to. It must be accessed with the relayd_net_seq_idx_lock
51 * held.
52 */
53 static pthread_mutex_t relayd_net_seq_idx_lock = PTHREAD_MUTEX_INITIALIZER;
54 static uint64_t relayd_net_seq_idx;
55
56 static int validate_event_name(const char *);
57 static int validate_ust_event_name(const char *);
58 static int cmd_enable_event_internal(struct ltt_session *session,
59 struct lttng_domain *domain,
60 char *channel_name, struct lttng_event *event,
61 char *filter_expression,
62 struct lttng_filter_bytecode *filter,
63 struct lttng_event_exclusion *exclusion,
64 int wpipe);
65
66 /*
67 * Create a session path used by list_lttng_sessions for the case that the
68 * session consumer is on the network.
69 */
70 static int build_network_session_path(char *dst, size_t size,
71 struct ltt_session *session)
72 {
73 int ret, kdata_port, udata_port;
74 struct lttng_uri *kuri = NULL, *uuri = NULL, *uri = NULL;
75 char tmp_uurl[PATH_MAX], tmp_urls[PATH_MAX];
76
77 assert(session);
78 assert(dst);
79
80 memset(tmp_urls, 0, sizeof(tmp_urls));
81 memset(tmp_uurl, 0, sizeof(tmp_uurl));
82
83 kdata_port = udata_port = DEFAULT_NETWORK_DATA_PORT;
84
85 if (session->kernel_session && session->kernel_session->consumer) {
86 kuri = &session->kernel_session->consumer->dst.net.control;
87 kdata_port = session->kernel_session->consumer->dst.net.data.port;
88 }
89
90 if (session->ust_session && session->ust_session->consumer) {
91 uuri = &session->ust_session->consumer->dst.net.control;
92 udata_port = session->ust_session->consumer->dst.net.data.port;
93 }
94
95 if (uuri == NULL && kuri == NULL) {
96 uri = &session->consumer->dst.net.control;
97 kdata_port = session->consumer->dst.net.data.port;
98 } else if (kuri && uuri) {
99 ret = uri_compare(kuri, uuri);
100 if (ret) {
101 /* Not Equal */
102 uri = kuri;
103 /* Build uuri URL string */
104 ret = uri_to_str_url(uuri, tmp_uurl, sizeof(tmp_uurl));
105 if (ret < 0) {
106 goto error;
107 }
108 } else {
109 uri = kuri;
110 }
111 } else if (kuri && uuri == NULL) {
112 uri = kuri;
113 } else if (uuri && kuri == NULL) {
114 uri = uuri;
115 }
116
117 ret = uri_to_str_url(uri, tmp_urls, sizeof(tmp_urls));
118 if (ret < 0) {
119 goto error;
120 }
121
122 /*
123 * Do we have a UST url set. If yes, this means we have both kernel and UST
124 * to print.
125 */
126 if (*tmp_uurl != '\0') {
127 ret = snprintf(dst, size, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
128 tmp_urls, kdata_port, tmp_uurl, udata_port);
129 } else {
130 int dport;
131 if (kuri || (!kuri && !uuri)) {
132 dport = kdata_port;
133 } else {
134 /* No kernel URI, use the UST port. */
135 dport = udata_port;
136 }
137 ret = snprintf(dst, size, "%s [data: %d]", tmp_urls, dport);
138 }
139
140 error:
141 return ret;
142 }
143
144 /*
145 * Get run-time attributes if the session has been started (discarded events,
146 * lost packets).
147 */
148 static int get_kernel_runtime_stats(struct ltt_session *session,
149 struct ltt_kernel_channel *kchan, uint64_t *discarded_events,
150 uint64_t *lost_packets)
151 {
152 int ret;
153
154 if (!session->has_been_started) {
155 ret = 0;
156 *discarded_events = 0;
157 *lost_packets = 0;
158 goto end;
159 }
160
161 ret = consumer_get_discarded_events(session->id, kchan->fd,
162 session->kernel_session->consumer,
163 discarded_events);
164 if (ret < 0) {
165 goto end;
166 }
167
168 ret = consumer_get_lost_packets(session->id, kchan->fd,
169 session->kernel_session->consumer,
170 lost_packets);
171 if (ret < 0) {
172 goto end;
173 }
174
175 end:
176 return ret;
177 }
178
179 /*
180 * Get run-time attributes if the session has been started (discarded events,
181 * lost packets).
182 */
183 static int get_ust_runtime_stats(struct ltt_session *session,
184 struct ltt_ust_channel *uchan, uint64_t *discarded_events,
185 uint64_t *lost_packets)
186 {
187 int ret;
188 struct ltt_ust_session *usess;
189
190 if (!discarded_events || !lost_packets) {
191 ret = -1;
192 goto end;
193 }
194
195 usess = session->ust_session;
196 assert(discarded_events);
197 assert(lost_packets);
198
199 if (!usess || !session->has_been_started) {
200 *discarded_events = 0;
201 *lost_packets = 0;
202 ret = 0;
203 goto end;
204 }
205
206 if (usess->buffer_type == LTTNG_BUFFER_PER_UID) {
207 ret = ust_app_uid_get_channel_runtime_stats(usess->id,
208 &usess->buffer_reg_uid_list,
209 usess->consumer, uchan->id,
210 uchan->attr.overwrite,
211 discarded_events,
212 lost_packets);
213 } else if (usess->buffer_type == LTTNG_BUFFER_PER_PID) {
214 ret = ust_app_pid_get_channel_runtime_stats(usess,
215 uchan, usess->consumer,
216 uchan->attr.overwrite,
217 discarded_events,
218 lost_packets);
219 if (ret < 0) {
220 goto end;
221 }
222 *discarded_events += uchan->per_pid_closed_app_discarded;
223 *lost_packets += uchan->per_pid_closed_app_lost;
224 } else {
225 ERR("Unsupported buffer type");
226 assert(0);
227 ret = -1;
228 goto end;
229 }
230
231 end:
232 return ret;
233 }
234
235 /*
236 * Fill lttng_channel array of all channels.
237 */
238 static ssize_t list_lttng_channels(enum lttng_domain_type domain,
239 struct ltt_session *session, struct lttng_channel *channels,
240 struct lttcomm_channel_extended *chan_exts)
241 {
242 int i = 0, ret = 0;
243 struct ltt_kernel_channel *kchan;
244
245 DBG("Listing channels for session %s", session->name);
246
247 switch (domain) {
248 case LTTNG_DOMAIN_KERNEL:
249 /* Kernel channels */
250 if (session->kernel_session != NULL) {
251 cds_list_for_each_entry(kchan,
252 &session->kernel_session->channel_list.head, list) {
253 uint64_t discarded_events, lost_packets;
254
255 ret = get_kernel_runtime_stats(session, kchan,
256 &discarded_events, &lost_packets);
257 if (ret < 0) {
258 goto end;
259 }
260 /* Copy lttng_channel struct to array */
261 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
262 channels[i].enabled = kchan->enabled;
263 chan_exts[i].discarded_events =
264 discarded_events;
265 chan_exts[i].lost_packets = lost_packets;
266 i++;
267 }
268 }
269 break;
270 case LTTNG_DOMAIN_UST:
271 {
272 struct lttng_ht_iter iter;
273 struct ltt_ust_channel *uchan;
274
275 rcu_read_lock();
276 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
277 &iter.iter, uchan, node.node) {
278 uint64_t discarded_events = 0, lost_packets = 0;
279
280 if (lttng_strncpy(channels[i].name, uchan->name,
281 LTTNG_SYMBOL_NAME_LEN)) {
282 break;
283 }
284 channels[i].attr.overwrite = uchan->attr.overwrite;
285 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
286 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
287 channels[i].attr.switch_timer_interval =
288 uchan->attr.switch_timer_interval;
289 channels[i].attr.read_timer_interval =
290 uchan->attr.read_timer_interval;
291 channels[i].enabled = uchan->enabled;
292 channels[i].attr.tracefile_size = uchan->tracefile_size;
293 channels[i].attr.tracefile_count = uchan->tracefile_count;
294
295 /*
296 * Map enum lttng_ust_output to enum lttng_event_output.
297 */
298 switch (uchan->attr.output) {
299 case LTTNG_UST_MMAP:
300 channels[i].attr.output = LTTNG_EVENT_MMAP;
301 break;
302 default:
303 /*
304 * LTTNG_UST_MMAP is the only supported UST
305 * output mode.
306 */
307 assert(0);
308 break;
309 }
310
311 ret = get_ust_runtime_stats(session, uchan,
312 &discarded_events, &lost_packets);
313 if (ret < 0) {
314 break;
315 }
316 chan_exts[i].discarded_events = discarded_events;
317 chan_exts[i].lost_packets = lost_packets;
318 i++;
319 }
320 rcu_read_unlock();
321 break;
322 }
323 default:
324 break;
325 }
326
327 end:
328 if (ret < 0) {
329 return -LTTNG_ERR_FATAL;
330 } else {
331 return LTTNG_OK;
332 }
333 }
334
335 static void increment_extended_len(const char *filter_expression,
336 struct lttng_event_exclusion *exclusion, size_t *extended_len)
337 {
338 *extended_len += sizeof(struct lttcomm_event_extended_header);
339
340 if (filter_expression) {
341 *extended_len += strlen(filter_expression) + 1;
342 }
343
344 if (exclusion) {
345 *extended_len += exclusion->count * LTTNG_SYMBOL_NAME_LEN;
346 }
347 }
348
349 static void append_extended_info(const char *filter_expression,
350 struct lttng_event_exclusion *exclusion, void **extended_at)
351 {
352 struct lttcomm_event_extended_header extended_header;
353 size_t filter_len = 0;
354 size_t nb_exclusions = 0;
355
356 if (filter_expression) {
357 filter_len = strlen(filter_expression) + 1;
358 }
359
360 if (exclusion) {
361 nb_exclusions = exclusion->count;
362 }
363
364 /* Set header fields */
365 extended_header.filter_len = filter_len;
366 extended_header.nb_exclusions = nb_exclusions;
367
368 /* Copy header */
369 memcpy(*extended_at, &extended_header, sizeof(extended_header));
370 *extended_at += sizeof(extended_header);
371
372 /* Copy filter string */
373 if (filter_expression) {
374 memcpy(*extended_at, filter_expression, filter_len);
375 *extended_at += filter_len;
376 }
377
378 /* Copy exclusion names */
379 if (exclusion) {
380 size_t len = nb_exclusions * LTTNG_SYMBOL_NAME_LEN;
381
382 memcpy(*extended_at, &exclusion->names, len);
383 *extended_at += len;
384 }
385 }
386
387 /*
388 * Create a list of agent domain events.
389 *
390 * Return number of events in list on success or else a negative value.
391 */
392 static int list_lttng_agent_events(struct agent *agt,
393 struct lttng_event **events, size_t *total_size)
394 {
395 int i = 0, ret = 0;
396 unsigned int nb_event = 0;
397 struct agent_event *event;
398 struct lttng_event *tmp_events;
399 struct lttng_ht_iter iter;
400 size_t extended_len = 0;
401 void *extended_at;
402
403 assert(agt);
404 assert(events);
405
406 DBG3("Listing agent events");
407
408 rcu_read_lock();
409 nb_event = lttng_ht_get_count(agt->events);
410 rcu_read_unlock();
411 if (nb_event == 0) {
412 ret = nb_event;
413 *total_size = 0;
414 goto error;
415 }
416
417 /* Compute required extended infos size */
418 extended_len = nb_event * sizeof(struct lttcomm_event_extended_header);
419
420 /*
421 * This is only valid because the commands which add events are
422 * processed in the same thread as the listing.
423 */
424 rcu_read_lock();
425 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
426 increment_extended_len(event->filter_expression, NULL,
427 &extended_len);
428 }
429 rcu_read_unlock();
430
431 *total_size = nb_event * sizeof(*tmp_events) + extended_len;
432 tmp_events = zmalloc(*total_size);
433 if (!tmp_events) {
434 PERROR("zmalloc agent events session");
435 ret = -LTTNG_ERR_FATAL;
436 goto error;
437 }
438
439 extended_at = ((uint8_t *) tmp_events) +
440 nb_event * sizeof(struct lttng_event);
441
442 rcu_read_lock();
443 cds_lfht_for_each_entry(agt->events->ht, &iter.iter, event, node.node) {
444 strncpy(tmp_events[i].name, event->name, sizeof(tmp_events[i].name));
445 tmp_events[i].name[sizeof(tmp_events[i].name) - 1] = '\0';
446 tmp_events[i].enabled = event->enabled;
447 tmp_events[i].loglevel = event->loglevel_value;
448 tmp_events[i].loglevel_type = event->loglevel_type;
449 i++;
450
451 /* Append extended info */
452 append_extended_info(event->filter_expression, NULL,
453 &extended_at);
454 }
455 rcu_read_unlock();
456
457 *events = tmp_events;
458 ret = nb_event;
459
460 error:
461 assert(nb_event == i);
462 return ret;
463 }
464
465 /*
466 * Create a list of ust global domain events.
467 */
468 static int list_lttng_ust_global_events(char *channel_name,
469 struct ltt_ust_domain_global *ust_global,
470 struct lttng_event **events, size_t *total_size)
471 {
472 int i = 0, ret = 0;
473 unsigned int nb_event = 0;
474 struct lttng_ht_iter iter;
475 struct lttng_ht_node_str *node;
476 struct ltt_ust_channel *uchan;
477 struct ltt_ust_event *uevent;
478 struct lttng_event *tmp;
479 size_t extended_len = 0;
480 void *extended_at;
481
482 DBG("Listing UST global events for channel %s", channel_name);
483
484 rcu_read_lock();
485
486 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
487 node = lttng_ht_iter_get_node_str(&iter);
488 if (node == NULL) {
489 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
490 goto end;
491 }
492
493 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
494
495 nb_event = lttng_ht_get_count(uchan->events);
496 if (nb_event == 0) {
497 ret = nb_event;
498 *total_size = 0;
499 goto end;
500 }
501
502 DBG3("Listing UST global %d events", nb_event);
503
504 /* Compute required extended infos size */
505 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
506 if (uevent->internal) {
507 nb_event--;
508 continue;
509 }
510
511 increment_extended_len(uevent->filter_expression,
512 uevent->exclusion, &extended_len);
513 }
514 if (nb_event == 0) {
515 /* All events are internal, skip. */
516 ret = 0;
517 *total_size = 0;
518 goto end;
519 }
520
521 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
522 tmp = zmalloc(*total_size);
523 if (tmp == NULL) {
524 ret = -LTTNG_ERR_FATAL;
525 goto end;
526 }
527
528 extended_at = ((uint8_t *) tmp) + nb_event * sizeof(struct lttng_event);
529
530 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
531 if (uevent->internal) {
532 /* This event should remain hidden from clients */
533 continue;
534 }
535 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
536 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
537 tmp[i].enabled = uevent->enabled;
538
539 switch (uevent->attr.instrumentation) {
540 case LTTNG_UST_TRACEPOINT:
541 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
542 break;
543 case LTTNG_UST_PROBE:
544 tmp[i].type = LTTNG_EVENT_PROBE;
545 break;
546 case LTTNG_UST_FUNCTION:
547 tmp[i].type = LTTNG_EVENT_FUNCTION;
548 break;
549 }
550
551 tmp[i].loglevel = uevent->attr.loglevel;
552 switch (uevent->attr.loglevel_type) {
553 case LTTNG_UST_LOGLEVEL_ALL:
554 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
555 break;
556 case LTTNG_UST_LOGLEVEL_RANGE:
557 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
558 break;
559 case LTTNG_UST_LOGLEVEL_SINGLE:
560 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
561 break;
562 }
563 if (uevent->filter) {
564 tmp[i].filter = 1;
565 }
566 if (uevent->exclusion) {
567 tmp[i].exclusion = 1;
568 }
569 i++;
570
571 /* Append extended info */
572 append_extended_info(uevent->filter_expression,
573 uevent->exclusion, &extended_at);
574 }
575
576 ret = nb_event;
577 *events = tmp;
578 end:
579 rcu_read_unlock();
580 return ret;
581 }
582
583 /*
584 * Fill lttng_event array of all kernel events in the channel.
585 */
586 static int list_lttng_kernel_events(char *channel_name,
587 struct ltt_kernel_session *kernel_session,
588 struct lttng_event **events, size_t *total_size)
589 {
590 int i = 0, ret;
591 unsigned int nb_event;
592 struct ltt_kernel_event *event;
593 struct ltt_kernel_channel *kchan;
594 size_t extended_len = 0;
595 void *extended_at;
596
597 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
598 if (kchan == NULL) {
599 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
600 goto error;
601 }
602
603 nb_event = kchan->event_count;
604
605 DBG("Listing events for channel %s", kchan->channel->name);
606
607 if (nb_event == 0) {
608 *total_size = 0;
609 *events = NULL;
610 goto end;
611 }
612
613 /* Compute required extended infos size */
614 cds_list_for_each_entry(event, &kchan->events_list.head, list) {
615 increment_extended_len(event->filter_expression, NULL,
616 &extended_len);
617 }
618
619 *total_size = nb_event * sizeof(struct lttng_event) + extended_len;
620 *events = zmalloc(*total_size);
621 if (*events == NULL) {
622 ret = LTTNG_ERR_FATAL;
623 goto error;
624 }
625
626 extended_at = ((void *) *events) +
627 nb_event * sizeof(struct lttng_event);
628
629 /* Kernel channels */
630 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
631 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
632 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
633 (*events)[i].enabled = event->enabled;
634 (*events)[i].filter =
635 (unsigned char) !!event->filter_expression;
636
637 switch (event->event->instrumentation) {
638 case LTTNG_KERNEL_TRACEPOINT:
639 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
640 break;
641 case LTTNG_KERNEL_KRETPROBE:
642 (*events)[i].type = LTTNG_EVENT_FUNCTION;
643 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
644 sizeof(struct lttng_kernel_kprobe));
645 break;
646 case LTTNG_KERNEL_KPROBE:
647 (*events)[i].type = LTTNG_EVENT_PROBE;
648 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
649 sizeof(struct lttng_kernel_kprobe));
650 break;
651 case LTTNG_KERNEL_FUNCTION:
652 (*events)[i].type = LTTNG_EVENT_FUNCTION;
653 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
654 sizeof(struct lttng_kernel_function));
655 break;
656 case LTTNG_KERNEL_NOOP:
657 (*events)[i].type = LTTNG_EVENT_NOOP;
658 break;
659 case LTTNG_KERNEL_SYSCALL:
660 (*events)[i].type = LTTNG_EVENT_SYSCALL;
661 break;
662 case LTTNG_KERNEL_ALL:
663 assert(0);
664 break;
665 }
666 i++;
667
668 /* Append extended info */
669 append_extended_info(event->filter_expression, NULL,
670 &extended_at);
671 }
672
673 end:
674 return nb_event;
675
676 error:
677 /* Negate the error code to differentiate the size from an error */
678 return -ret;
679 }
680
681 /*
682 * Add URI so the consumer output object. Set the correct path depending on the
683 * domain adding the default trace directory.
684 */
685 static int add_uri_to_consumer(struct consumer_output *consumer,
686 struct lttng_uri *uri, enum lttng_domain_type domain,
687 const char *session_name)
688 {
689 int ret = LTTNG_OK;
690 const char *default_trace_dir;
691
692 assert(uri);
693
694 if (consumer == NULL) {
695 DBG("No consumer detected. Don't add URI. Stopping.");
696 ret = LTTNG_ERR_NO_CONSUMER;
697 goto error;
698 }
699
700 switch (domain) {
701 case LTTNG_DOMAIN_KERNEL:
702 default_trace_dir = DEFAULT_KERNEL_TRACE_DIR;
703 break;
704 case LTTNG_DOMAIN_UST:
705 default_trace_dir = DEFAULT_UST_TRACE_DIR;
706 break;
707 default:
708 /*
709 * This case is possible is we try to add the URI to the global tracing
710 * session consumer object which in this case there is no subdir.
711 */
712 default_trace_dir = "";
713 }
714
715 switch (uri->dtype) {
716 case LTTNG_DST_IPV4:
717 case LTTNG_DST_IPV6:
718 DBG2("Setting network URI to consumer");
719
720 if (consumer->type == CONSUMER_DST_NET) {
721 if ((uri->stype == LTTNG_STREAM_CONTROL &&
722 consumer->dst.net.control_isset) ||
723 (uri->stype == LTTNG_STREAM_DATA &&
724 consumer->dst.net.data_isset)) {
725 ret = LTTNG_ERR_URL_EXIST;
726 goto error;
727 }
728 } else {
729 memset(&consumer->dst.net, 0, sizeof(consumer->dst.net));
730 }
731
732 consumer->type = CONSUMER_DST_NET;
733
734 /* Set URI into consumer output object */
735 ret = consumer_set_network_uri(consumer, uri);
736 if (ret < 0) {
737 ret = -ret;
738 goto error;
739 } else if (ret == 1) {
740 /*
741 * URI was the same in the consumer so we do not append the subdir
742 * again so to not duplicate output dir.
743 */
744 ret = LTTNG_OK;
745 goto error;
746 }
747
748 if (uri->stype == LTTNG_STREAM_CONTROL && strlen(uri->subdir) == 0) {
749 ret = consumer_set_subdir(consumer, session_name);
750 if (ret < 0) {
751 ret = LTTNG_ERR_FATAL;
752 goto error;
753 }
754 }
755
756 if (uri->stype == LTTNG_STREAM_CONTROL) {
757 /* On a new subdir, reappend the default trace dir. */
758 strncat(consumer->subdir, default_trace_dir,
759 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
760 DBG3("Append domain trace name to subdir %s", consumer->subdir);
761 }
762
763 break;
764 case LTTNG_DST_PATH:
765 DBG2("Setting trace directory path from URI to %s", uri->dst.path);
766 memset(consumer->dst.trace_path, 0,
767 sizeof(consumer->dst.trace_path));
768 /* Explicit length checks for strcpy and strcat. */
769 if (strlen(uri->dst.path) + strlen(default_trace_dir)
770 >= sizeof(consumer->dst.trace_path)) {
771 ret = LTTNG_ERR_FATAL;
772 goto error;
773 }
774 strcpy(consumer->dst.trace_path, uri->dst.path);
775 /* Append default trace dir */
776 strcat(consumer->dst.trace_path, default_trace_dir);
777 /* Flag consumer as local. */
778 consumer->type = CONSUMER_DST_LOCAL;
779 break;
780 }
781
782 ret = LTTNG_OK;
783
784 error:
785 return ret;
786 }
787
788 /*
789 * Init tracing by creating trace directory and sending fds kernel consumer.
790 */
791 static int init_kernel_tracing(struct ltt_kernel_session *session)
792 {
793 int ret = 0;
794 struct lttng_ht_iter iter;
795 struct consumer_socket *socket;
796
797 assert(session);
798
799 rcu_read_lock();
800
801 if (session->consumer_fds_sent == 0 && session->consumer != NULL) {
802 cds_lfht_for_each_entry(session->consumer->socks->ht, &iter.iter,
803 socket, node.node) {
804 pthread_mutex_lock(socket->lock);
805 ret = kernel_consumer_send_session(socket, session);
806 pthread_mutex_unlock(socket->lock);
807 if (ret < 0) {
808 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
809 goto error;
810 }
811 }
812 }
813
814 error:
815 rcu_read_unlock();
816 return ret;
817 }
818
819 /*
820 * Create a socket to the relayd using the URI.
821 *
822 * On success, the relayd_sock pointer is set to the created socket.
823 * Else, it's stays untouched and a lttcomm error code is returned.
824 */
825 static int create_connect_relayd(struct lttng_uri *uri,
826 struct lttcomm_relayd_sock **relayd_sock,
827 struct consumer_output *consumer)
828 {
829 int ret;
830 struct lttcomm_relayd_sock *rsock;
831
832 rsock = lttcomm_alloc_relayd_sock(uri, RELAYD_VERSION_COMM_MAJOR,
833 RELAYD_VERSION_COMM_MINOR);
834 if (!rsock) {
835 ret = LTTNG_ERR_FATAL;
836 goto error;
837 }
838
839 /*
840 * Connect to relayd so we can proceed with a session creation. This call
841 * can possibly block for an arbitrary amount of time to set the health
842 * state to be in poll execution.
843 */
844 health_poll_entry();
845 ret = relayd_connect(rsock);
846 health_poll_exit();
847 if (ret < 0) {
848 ERR("Unable to reach lttng-relayd");
849 ret = LTTNG_ERR_RELAYD_CONNECT_FAIL;
850 goto free_sock;
851 }
852
853 /* Create socket for control stream. */
854 if (uri->stype == LTTNG_STREAM_CONTROL) {
855 DBG3("Creating relayd stream socket from URI");
856
857 /* Check relayd version */
858 ret = relayd_version_check(rsock);
859 if (ret < 0) {
860 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
861 goto close_sock;
862 }
863 consumer->relay_major_version = rsock->major;
864 consumer->relay_minor_version = rsock->minor;
865 } else if (uri->stype == LTTNG_STREAM_DATA) {
866 DBG3("Creating relayd data socket from URI");
867 } else {
868 /* Command is not valid */
869 ERR("Relayd invalid stream type: %d", uri->stype);
870 ret = LTTNG_ERR_INVALID;
871 goto close_sock;
872 }
873
874 *relayd_sock = rsock;
875
876 return LTTNG_OK;
877
878 close_sock:
879 /* The returned value is not useful since we are on an error path. */
880 (void) relayd_close(rsock);
881 free_sock:
882 free(rsock);
883 error:
884 return ret;
885 }
886
887 /*
888 * Connect to the relayd using URI and send the socket to the right consumer.
889 */
890 static int send_consumer_relayd_socket(enum lttng_domain_type domain,
891 unsigned int session_id, struct lttng_uri *relayd_uri,
892 struct consumer_output *consumer,
893 struct consumer_socket *consumer_sock,
894 char *session_name, char *hostname, int session_live_timer)
895 {
896 int ret;
897 struct lttcomm_relayd_sock *rsock = NULL;
898
899 /* Connect to relayd and make version check if uri is the control. */
900 ret = create_connect_relayd(relayd_uri, &rsock, consumer);
901 if (ret != LTTNG_OK) {
902 goto error;
903 }
904 assert(rsock);
905
906 /* Set the network sequence index if not set. */
907 if (consumer->net_seq_index == (uint64_t) -1ULL) {
908 pthread_mutex_lock(&relayd_net_seq_idx_lock);
909 /*
910 * Increment net_seq_idx because we are about to transfer the
911 * new relayd socket to the consumer.
912 * Assign unique key so the consumer can match streams.
913 */
914 consumer->net_seq_index = ++relayd_net_seq_idx;
915 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
916 }
917
918 /* Send relayd socket to consumer. */
919 ret = consumer_send_relayd_socket(consumer_sock, rsock, consumer,
920 relayd_uri->stype, session_id,
921 session_name, hostname, session_live_timer);
922 if (ret < 0) {
923 ret = LTTNG_ERR_ENABLE_CONSUMER_FAIL;
924 goto close_sock;
925 }
926
927 /* Flag that the corresponding socket was sent. */
928 if (relayd_uri->stype == LTTNG_STREAM_CONTROL) {
929 consumer_sock->control_sock_sent = 1;
930 } else if (relayd_uri->stype == LTTNG_STREAM_DATA) {
931 consumer_sock->data_sock_sent = 1;
932 }
933
934 ret = LTTNG_OK;
935
936 /*
937 * Close socket which was dup on the consumer side. The session daemon does
938 * NOT keep track of the relayd socket(s) once transfer to the consumer.
939 */
940
941 close_sock:
942 (void) relayd_close(rsock);
943 free(rsock);
944
945 error:
946 if (ret != LTTNG_OK) {
947 /*
948 * The consumer output for this session should not be used anymore
949 * since the relayd connection failed thus making any tracing or/and
950 * streaming not usable.
951 */
952 consumer->enabled = 0;
953 }
954 return ret;
955 }
956
957 /*
958 * Send both relayd sockets to a specific consumer and domain. This is a
959 * helper function to facilitate sending the information to the consumer for a
960 * session.
961 */
962 static int send_consumer_relayd_sockets(enum lttng_domain_type domain,
963 unsigned int session_id, struct consumer_output *consumer,
964 struct consumer_socket *sock, char *session_name,
965 char *hostname, int session_live_timer)
966 {
967 int ret = LTTNG_OK;
968
969 assert(consumer);
970 assert(sock);
971
972 /* Sending control relayd socket. */
973 if (!sock->control_sock_sent) {
974 ret = send_consumer_relayd_socket(domain, session_id,
975 &consumer->dst.net.control, consumer, sock,
976 session_name, hostname, session_live_timer);
977 if (ret != LTTNG_OK) {
978 goto error;
979 }
980 }
981
982 /* Sending data relayd socket. */
983 if (!sock->data_sock_sent) {
984 ret = send_consumer_relayd_socket(domain, session_id,
985 &consumer->dst.net.data, consumer, sock,
986 session_name, hostname, session_live_timer);
987 if (ret != LTTNG_OK) {
988 goto error;
989 }
990 }
991
992 error:
993 return ret;
994 }
995
996 /*
997 * Setup relayd connections for a tracing session. First creates the socket to
998 * the relayd and send them to the right domain consumer. Consumer type MUST be
999 * network.
1000 */
1001 int cmd_setup_relayd(struct ltt_session *session)
1002 {
1003 int ret = LTTNG_OK;
1004 struct ltt_ust_session *usess;
1005 struct ltt_kernel_session *ksess;
1006 struct consumer_socket *socket;
1007 struct lttng_ht_iter iter;
1008
1009 assert(session);
1010
1011 usess = session->ust_session;
1012 ksess = session->kernel_session;
1013
1014 DBG("Setting relayd for session %s", session->name);
1015
1016 rcu_read_lock();
1017
1018 if (usess && usess->consumer && usess->consumer->type == CONSUMER_DST_NET
1019 && usess->consumer->enabled) {
1020 /* For each consumer socket, send relayd sockets */
1021 cds_lfht_for_each_entry(usess->consumer->socks->ht, &iter.iter,
1022 socket, node.node) {
1023 pthread_mutex_lock(socket->lock);
1024 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_UST, session->id,
1025 usess->consumer, socket,
1026 session->name, session->hostname,
1027 session->live_timer);
1028 pthread_mutex_unlock(socket->lock);
1029 if (ret != LTTNG_OK) {
1030 goto error;
1031 }
1032 /* Session is now ready for network streaming. */
1033 session->net_handle = 1;
1034 }
1035 session->consumer->relay_major_version =
1036 usess->consumer->relay_major_version;
1037 session->consumer->relay_minor_version =
1038 usess->consumer->relay_minor_version;
1039 }
1040
1041 if (ksess && ksess->consumer && ksess->consumer->type == CONSUMER_DST_NET
1042 && ksess->consumer->enabled) {
1043 cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter,
1044 socket, node.node) {
1045 pthread_mutex_lock(socket->lock);
1046 ret = send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL, session->id,
1047 ksess->consumer, socket,
1048 session->name, session->hostname,
1049 session->live_timer);
1050 pthread_mutex_unlock(socket->lock);
1051 if (ret != LTTNG_OK) {
1052 goto error;
1053 }
1054 /* Session is now ready for network streaming. */
1055 session->net_handle = 1;
1056 }
1057 session->consumer->relay_major_version =
1058 ksess->consumer->relay_major_version;
1059 session->consumer->relay_minor_version =
1060 ksess->consumer->relay_minor_version;
1061 }
1062
1063 error:
1064 rcu_read_unlock();
1065 return ret;
1066 }
1067
1068 /*
1069 * Start a kernel session by opening all necessary streams.
1070 */
1071 static int start_kernel_session(struct ltt_kernel_session *ksess, int wpipe)
1072 {
1073 int ret;
1074 struct ltt_kernel_channel *kchan;
1075
1076 /* Open kernel metadata */
1077 if (ksess->metadata == NULL && ksess->output_traces) {
1078 ret = kernel_open_metadata(ksess);
1079 if (ret < 0) {
1080 ret = LTTNG_ERR_KERN_META_FAIL;
1081 goto error;
1082 }
1083 }
1084
1085 /* Open kernel metadata stream */
1086 if (ksess->metadata && ksess->metadata_stream_fd < 0) {
1087 ret = kernel_open_metadata_stream(ksess);
1088 if (ret < 0) {
1089 ERR("Kernel create metadata stream failed");
1090 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1091 goto error;
1092 }
1093 }
1094
1095 /* For each channel */
1096 cds_list_for_each_entry(kchan, &ksess->channel_list.head, list) {
1097 if (kchan->stream_count == 0) {
1098 ret = kernel_open_channel_stream(kchan);
1099 if (ret < 0) {
1100 ret = LTTNG_ERR_KERN_STREAM_FAIL;
1101 goto error;
1102 }
1103 /* Update the stream global counter */
1104 ksess->stream_count_global += ret;
1105 }
1106 }
1107
1108 /* Setup kernel consumer socket and send fds to it */
1109 ret = init_kernel_tracing(ksess);
1110 if (ret != 0) {
1111 ret = LTTNG_ERR_KERN_START_FAIL;
1112 goto error;
1113 }
1114
1115 /* This start the kernel tracing */
1116 ret = kernel_start_session(ksess);
1117 if (ret < 0) {
1118 ret = LTTNG_ERR_KERN_START_FAIL;
1119 goto error;
1120 }
1121
1122 /* Quiescent wait after starting trace */
1123 kernel_wait_quiescent(kernel_tracer_fd);
1124
1125 ksess->active = 1;
1126
1127 ret = LTTNG_OK;
1128
1129 error:
1130 return ret;
1131 }
1132
1133 /*
1134 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1135 */
1136 int cmd_disable_channel(struct ltt_session *session,
1137 enum lttng_domain_type domain, char *channel_name)
1138 {
1139 int ret;
1140 struct ltt_ust_session *usess;
1141
1142 usess = session->ust_session;
1143
1144 rcu_read_lock();
1145
1146 switch (domain) {
1147 case LTTNG_DOMAIN_KERNEL:
1148 {
1149 ret = channel_kernel_disable(session->kernel_session,
1150 channel_name);
1151 if (ret != LTTNG_OK) {
1152 goto error;
1153 }
1154
1155 kernel_wait_quiescent(kernel_tracer_fd);
1156 break;
1157 }
1158 case LTTNG_DOMAIN_UST:
1159 {
1160 struct ltt_ust_channel *uchan;
1161 struct lttng_ht *chan_ht;
1162
1163 chan_ht = usess->domain_global.channels;
1164
1165 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
1166 if (uchan == NULL) {
1167 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1168 goto error;
1169 }
1170
1171 ret = channel_ust_disable(usess, uchan);
1172 if (ret != LTTNG_OK) {
1173 goto error;
1174 }
1175 break;
1176 }
1177 default:
1178 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1179 goto error;
1180 }
1181
1182 ret = LTTNG_OK;
1183
1184 error:
1185 rcu_read_unlock();
1186 return ret;
1187 }
1188
1189 /*
1190 * Command LTTNG_TRACK_PID processed by the client thread.
1191 *
1192 * Called with session lock held.
1193 */
1194 int cmd_track_pid(struct ltt_session *session, enum lttng_domain_type domain,
1195 int pid)
1196 {
1197 int ret;
1198
1199 rcu_read_lock();
1200
1201 switch (domain) {
1202 case LTTNG_DOMAIN_KERNEL:
1203 {
1204 struct ltt_kernel_session *ksess;
1205
1206 ksess = session->kernel_session;
1207
1208 ret = kernel_track_pid(ksess, pid);
1209 if (ret != LTTNG_OK) {
1210 goto error;
1211 }
1212
1213 kernel_wait_quiescent(kernel_tracer_fd);
1214 break;
1215 }
1216 case LTTNG_DOMAIN_UST:
1217 {
1218 struct ltt_ust_session *usess;
1219
1220 usess = session->ust_session;
1221
1222 ret = trace_ust_track_pid(usess, pid);
1223 if (ret != LTTNG_OK) {
1224 goto error;
1225 }
1226 break;
1227 }
1228 default:
1229 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1230 goto error;
1231 }
1232
1233 ret = LTTNG_OK;
1234
1235 error:
1236 rcu_read_unlock();
1237 return ret;
1238 }
1239
1240 /*
1241 * Command LTTNG_UNTRACK_PID processed by the client thread.
1242 *
1243 * Called with session lock held.
1244 */
1245 int cmd_untrack_pid(struct ltt_session *session, enum lttng_domain_type domain,
1246 int pid)
1247 {
1248 int ret;
1249
1250 rcu_read_lock();
1251
1252 switch (domain) {
1253 case LTTNG_DOMAIN_KERNEL:
1254 {
1255 struct ltt_kernel_session *ksess;
1256
1257 ksess = session->kernel_session;
1258
1259 ret = kernel_untrack_pid(ksess, pid);
1260 if (ret != LTTNG_OK) {
1261 goto error;
1262 }
1263
1264 kernel_wait_quiescent(kernel_tracer_fd);
1265 break;
1266 }
1267 case LTTNG_DOMAIN_UST:
1268 {
1269 struct ltt_ust_session *usess;
1270
1271 usess = session->ust_session;
1272
1273 ret = trace_ust_untrack_pid(usess, pid);
1274 if (ret != LTTNG_OK) {
1275 goto error;
1276 }
1277 break;
1278 }
1279 default:
1280 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
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_ENABLE_CHANNEL processed by the client thread.
1293 *
1294 * The wpipe arguments is used as a notifier for the kernel thread.
1295 */
1296 int cmd_enable_channel(struct ltt_session *session,
1297 struct lttng_domain *domain, struct lttng_channel *attr, int wpipe)
1298 {
1299 int ret;
1300 struct ltt_ust_session *usess = session->ust_session;
1301 struct lttng_ht *chan_ht;
1302 size_t len;
1303
1304 assert(session);
1305 assert(attr);
1306 assert(domain);
1307
1308 len = lttng_strnlen(attr->name, sizeof(attr->name));
1309
1310 /* Validate channel name */
1311 if (attr->name[0] == '.' ||
1312 memchr(attr->name, '/', len) != NULL) {
1313 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1314 goto end;
1315 }
1316
1317 DBG("Enabling channel %s for session %s", attr->name, session->name);
1318
1319 rcu_read_lock();
1320
1321 /*
1322 * Don't try to enable a channel if the session has been started at
1323 * some point in time before. The tracer does not allow it.
1324 */
1325 if (session->has_been_started) {
1326 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
1327 goto error;
1328 }
1329
1330 /*
1331 * If the session is a live session, remove the switch timer, the
1332 * live timer does the same thing but sends also synchronisation
1333 * beacons for inactive streams.
1334 */
1335 if (session->live_timer > 0) {
1336 attr->attr.live_timer_interval = session->live_timer;
1337 attr->attr.switch_timer_interval = 0;
1338 }
1339
1340 switch (domain->type) {
1341 case LTTNG_DOMAIN_KERNEL:
1342 {
1343 struct ltt_kernel_channel *kchan;
1344
1345 kchan = trace_kernel_get_channel_by_name(attr->name,
1346 session->kernel_session);
1347 if (kchan == NULL) {
1348 ret = channel_kernel_create(session->kernel_session, attr, wpipe);
1349 if (attr->name[0] != '\0') {
1350 session->kernel_session->has_non_default_channel = 1;
1351 }
1352 } else {
1353 ret = channel_kernel_enable(session->kernel_session, kchan);
1354 }
1355
1356 if (ret != LTTNG_OK) {
1357 goto error;
1358 }
1359
1360 kernel_wait_quiescent(kernel_tracer_fd);
1361 break;
1362 }
1363 case LTTNG_DOMAIN_UST:
1364 case LTTNG_DOMAIN_JUL:
1365 case LTTNG_DOMAIN_LOG4J:
1366 case LTTNG_DOMAIN_PYTHON:
1367 {
1368 struct ltt_ust_channel *uchan;
1369
1370 /*
1371 * FIXME
1372 *
1373 * Current agent implementation limitations force us to allow
1374 * only one channel at once in "agent" subdomains. Each
1375 * subdomain has a default channel name which must be strictly
1376 * adhered to.
1377 */
1378 if (domain->type == LTTNG_DOMAIN_JUL) {
1379 if (strncmp(attr->name, DEFAULT_JUL_CHANNEL_NAME,
1380 LTTNG_SYMBOL_NAME_LEN)) {
1381 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1382 goto error;
1383 }
1384 } else if (domain->type == LTTNG_DOMAIN_LOG4J) {
1385 if (strncmp(attr->name, DEFAULT_LOG4J_CHANNEL_NAME,
1386 LTTNG_SYMBOL_NAME_LEN)) {
1387 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1388 goto error;
1389 }
1390 } else if (domain->type == LTTNG_DOMAIN_PYTHON) {
1391 if (strncmp(attr->name, DEFAULT_PYTHON_CHANNEL_NAME,
1392 LTTNG_SYMBOL_NAME_LEN)) {
1393 ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
1394 goto error;
1395 }
1396 }
1397
1398 chan_ht = usess->domain_global.channels;
1399
1400 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
1401 if (uchan == NULL) {
1402 ret = channel_ust_create(usess, attr, domain->buf_type);
1403 if (attr->name[0] != '\0') {
1404 usess->has_non_default_channel = 1;
1405 }
1406 } else {
1407 ret = channel_ust_enable(usess, uchan);
1408 }
1409 break;
1410 }
1411 default:
1412 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
1413 goto error;
1414 }
1415
1416 error:
1417 rcu_read_unlock();
1418 end:
1419 return ret;
1420 }
1421
1422 /*
1423 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1424 */
1425 int cmd_disable_event(struct ltt_session *session,
1426 enum lttng_domain_type domain, char *channel_name,
1427 struct lttng_event *event)
1428 {
1429 int ret;
1430 char *event_name;
1431
1432 DBG("Disable event command for event \'%s\'", event->name);
1433
1434 event_name = event->name;
1435 if (validate_event_name(event_name)) {
1436 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1437 goto error;
1438 }
1439
1440 /* Error out on unhandled search criteria */
1441 if (event->loglevel_type || event->loglevel != -1 || event->enabled
1442 || event->pid || event->filter || event->exclusion) {
1443 ret = LTTNG_ERR_UNK;
1444 goto error;
1445 }
1446
1447 rcu_read_lock();
1448
1449 switch (domain) {
1450 case LTTNG_DOMAIN_KERNEL:
1451 {
1452 struct ltt_kernel_channel *kchan;
1453 struct ltt_kernel_session *ksess;
1454
1455 ksess = session->kernel_session;
1456
1457 /*
1458 * If a non-default channel has been created in the
1459 * session, explicitely require that -c chan_name needs
1460 * to be provided.
1461 */
1462 if (ksess->has_non_default_channel && channel_name[0] == '\0') {
1463 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1464 goto error_unlock;
1465 }
1466
1467 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
1468 if (kchan == NULL) {
1469 ret = LTTNG_ERR_KERN_CHAN_NOT_FOUND;
1470 goto error_unlock;
1471 }
1472
1473 switch (event->type) {
1474 case LTTNG_EVENT_ALL:
1475 case LTTNG_EVENT_TRACEPOINT:
1476 case LTTNG_EVENT_SYSCALL:
1477 case LTTNG_EVENT_PROBE:
1478 case LTTNG_EVENT_FUNCTION:
1479 case LTTNG_EVENT_FUNCTION_ENTRY:/* fall-through */
1480 if (event_name[0] == '\0') {
1481 ret = event_kernel_disable_event(kchan,
1482 NULL, event->type);
1483 } else {
1484 ret = event_kernel_disable_event(kchan,
1485 event_name, event->type);
1486 }
1487 if (ret != LTTNG_OK) {
1488 goto error_unlock;
1489 }
1490 break;
1491 default:
1492 ret = LTTNG_ERR_UNK;
1493 goto error_unlock;
1494 }
1495
1496 kernel_wait_quiescent(kernel_tracer_fd);
1497 break;
1498 }
1499 case LTTNG_DOMAIN_UST:
1500 {
1501 struct ltt_ust_channel *uchan;
1502 struct ltt_ust_session *usess;
1503
1504 usess = session->ust_session;
1505
1506 if (validate_ust_event_name(event_name)) {
1507 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1508 goto error_unlock;
1509 }
1510
1511 /*
1512 * If a non-default channel has been created in the
1513 * session, explicitly require that -c chan_name needs
1514 * to be provided.
1515 */
1516 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1517 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1518 goto error_unlock;
1519 }
1520
1521 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1522 channel_name);
1523 if (uchan == NULL) {
1524 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1525 goto error_unlock;
1526 }
1527
1528 switch (event->type) {
1529 case LTTNG_EVENT_ALL:
1530 /*
1531 * An empty event name means that everything
1532 * should be disabled.
1533 */
1534 if (event->name[0] == '\0') {
1535 ret = event_ust_disable_all_tracepoints(usess, uchan);
1536 } else {
1537 ret = event_ust_disable_tracepoint(usess, uchan,
1538 event_name);
1539 }
1540 if (ret != LTTNG_OK) {
1541 goto error_unlock;
1542 }
1543 break;
1544 default:
1545 ret = LTTNG_ERR_UNK;
1546 goto error_unlock;
1547 }
1548
1549 DBG3("Disable UST event %s in channel %s completed", event_name,
1550 channel_name);
1551 break;
1552 }
1553 case LTTNG_DOMAIN_LOG4J:
1554 case LTTNG_DOMAIN_JUL:
1555 case LTTNG_DOMAIN_PYTHON:
1556 {
1557 struct agent *agt;
1558 struct ltt_ust_session *usess = session->ust_session;
1559
1560 assert(usess);
1561
1562 switch (event->type) {
1563 case LTTNG_EVENT_ALL:
1564 break;
1565 default:
1566 ret = LTTNG_ERR_UNK;
1567 goto error_unlock;
1568 }
1569
1570 agt = trace_ust_find_agent(usess, domain);
1571 if (!agt) {
1572 ret = -LTTNG_ERR_UST_EVENT_NOT_FOUND;
1573 goto error_unlock;
1574 }
1575 /*
1576 * An empty event name means that everything
1577 * should be disabled.
1578 */
1579 if (event->name[0] == '\0') {
1580 ret = event_agent_disable_all(usess, agt);
1581 } else {
1582 ret = event_agent_disable(usess, agt, event_name);
1583 }
1584 if (ret != LTTNG_OK) {
1585 goto error_unlock;
1586 }
1587
1588 break;
1589 }
1590 default:
1591 ret = LTTNG_ERR_UND;
1592 goto error_unlock;
1593 }
1594
1595 ret = LTTNG_OK;
1596
1597 error_unlock:
1598 rcu_read_unlock();
1599 error:
1600 return ret;
1601 }
1602
1603 /*
1604 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1605 */
1606 int cmd_add_context(struct ltt_session *session, enum lttng_domain_type domain,
1607 char *channel_name, struct lttng_event_context *ctx, int kwpipe)
1608 {
1609 int ret, chan_kern_created = 0, chan_ust_created = 0;
1610 char *app_ctx_provider_name = NULL, *app_ctx_name = NULL;
1611
1612 if (ctx->ctx == LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
1613 app_ctx_provider_name = ctx->u.app_ctx.provider_name;
1614 app_ctx_name = ctx->u.app_ctx.ctx_name;
1615 }
1616
1617 switch (domain) {
1618 case LTTNG_DOMAIN_KERNEL:
1619 assert(session->kernel_session);
1620
1621 if (session->kernel_session->channel_count == 0) {
1622 /* Create default channel */
1623 ret = channel_kernel_create(session->kernel_session, NULL, kwpipe);
1624 if (ret != LTTNG_OK) {
1625 goto error;
1626 }
1627 chan_kern_created = 1;
1628 }
1629 /* Add kernel context to kernel tracer */
1630 ret = context_kernel_add(session->kernel_session, ctx, channel_name);
1631 if (ret != LTTNG_OK) {
1632 goto error;
1633 }
1634 break;
1635 case LTTNG_DOMAIN_JUL:
1636 case LTTNG_DOMAIN_LOG4J:
1637 {
1638 /*
1639 * Validate channel name.
1640 * If no channel name is given and the domain is JUL or LOG4J,
1641 * set it to the appropriate domain-specific channel name. If
1642 * a name is provided but does not match the expexted channel
1643 * name, return an error.
1644 */
1645 if (domain == LTTNG_DOMAIN_JUL && *channel_name &&
1646 strcmp(channel_name,
1647 DEFAULT_JUL_CHANNEL_NAME)) {
1648 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1649 goto error;
1650 } else if (domain == LTTNG_DOMAIN_LOG4J && *channel_name &&
1651 strcmp(channel_name,
1652 DEFAULT_LOG4J_CHANNEL_NAME)) {
1653 ret = LTTNG_ERR_UST_CHAN_NOT_FOUND;
1654 goto error;
1655 }
1656 /* break is _not_ missing here. */
1657 }
1658 case LTTNG_DOMAIN_UST:
1659 {
1660 struct ltt_ust_session *usess = session->ust_session;
1661 unsigned int chan_count;
1662
1663 assert(usess);
1664
1665 chan_count = lttng_ht_get_count(usess->domain_global.channels);
1666 if (chan_count == 0) {
1667 struct lttng_channel *attr;
1668 /* Create default channel */
1669 attr = channel_new_default_attr(domain, usess->buffer_type);
1670 if (attr == NULL) {
1671 ret = LTTNG_ERR_FATAL;
1672 goto error;
1673 }
1674
1675 ret = channel_ust_create(usess, attr, usess->buffer_type);
1676 if (ret != LTTNG_OK) {
1677 free(attr);
1678 goto error;
1679 }
1680 free(attr);
1681 chan_ust_created = 1;
1682 }
1683
1684 ret = context_ust_add(usess, domain, ctx, channel_name);
1685 free(app_ctx_provider_name);
1686 free(app_ctx_name);
1687 app_ctx_name = NULL;
1688 app_ctx_provider_name = NULL;
1689 if (ret != LTTNG_OK) {
1690 goto error;
1691 }
1692 break;
1693 }
1694 default:
1695 ret = LTTNG_ERR_UND;
1696 goto error;
1697 }
1698
1699 ret = LTTNG_OK;
1700 goto end;
1701
1702 error:
1703 if (chan_kern_created) {
1704 struct ltt_kernel_channel *kchan =
1705 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME,
1706 session->kernel_session);
1707 /* Created previously, this should NOT fail. */
1708 assert(kchan);
1709 kernel_destroy_channel(kchan);
1710 }
1711
1712 if (chan_ust_created) {
1713 struct ltt_ust_channel *uchan =
1714 trace_ust_find_channel_by_name(
1715 session->ust_session->domain_global.channels,
1716 DEFAULT_CHANNEL_NAME);
1717 /* Created previously, this should NOT fail. */
1718 assert(uchan);
1719 /* Remove from the channel list of the session. */
1720 trace_ust_delete_channel(session->ust_session->domain_global.channels,
1721 uchan);
1722 trace_ust_destroy_channel(uchan);
1723 }
1724 end:
1725 free(app_ctx_provider_name);
1726 free(app_ctx_name);
1727 return ret;
1728 }
1729
1730 static int validate_event_name(const char *name)
1731 {
1732 int ret = 0;
1733 const char *c = name;
1734 const char *event_name_end = c + LTTNG_SYMBOL_NAME_LEN;
1735 bool null_terminated = false;
1736
1737 /*
1738 * Make sure that unescaped wildcards are only used as the last
1739 * character of the event name.
1740 */
1741 while (c < event_name_end) {
1742 switch (*c) {
1743 case '\0':
1744 null_terminated = true;
1745 goto end;
1746 case '\\':
1747 c++;
1748 break;
1749 case '*':
1750 if ((c + 1) < event_name_end && *(c + 1)) {
1751 /* Wildcard is not the last character */
1752 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1753 goto end;
1754 }
1755 default:
1756 break;
1757 }
1758 c++;
1759 }
1760 end:
1761 if (!ret && !null_terminated) {
1762 ret = LTTNG_ERR_INVALID_EVENT_NAME;
1763 }
1764 return ret;
1765 }
1766
1767 static inline bool name_starts_with(const char *name, const char *prefix)
1768 {
1769 const size_t max_cmp_len = min(strlen(prefix), LTTNG_SYMBOL_NAME_LEN);
1770
1771 return !strncmp(name, prefix, max_cmp_len);
1772 }
1773
1774 /* Perform userspace-specific event name validation */
1775 static int validate_ust_event_name(const char *name)
1776 {
1777 int ret = 0;
1778
1779 if (!name) {
1780 ret = -1;
1781 goto end;
1782 }
1783
1784 /*
1785 * Check name against all internal UST event component namespaces used
1786 * by the agents.
1787 */
1788 if (name_starts_with(name, DEFAULT_JUL_EVENT_COMPONENT) ||
1789 name_starts_with(name, DEFAULT_LOG4J_EVENT_COMPONENT) ||
1790 name_starts_with(name, DEFAULT_PYTHON_EVENT_COMPONENT)) {
1791 ret = -1;
1792 }
1793
1794 end:
1795 return ret;
1796 }
1797
1798 /*
1799 * Internal version of cmd_enable_event() with a supplemental
1800 * "internal_event" flag which is used to enable internal events which should
1801 * be hidden from clients. Such events are used in the agent implementation to
1802 * enable the events through which all "agent" events are funeled.
1803 */
1804 static int _cmd_enable_event(struct ltt_session *session,
1805 struct lttng_domain *domain,
1806 char *channel_name, struct lttng_event *event,
1807 char *filter_expression,
1808 struct lttng_filter_bytecode *filter,
1809 struct lttng_event_exclusion *exclusion,
1810 int wpipe, bool internal_event)
1811 {
1812 int ret, channel_created = 0;
1813 struct lttng_channel *attr = NULL;
1814
1815 assert(session);
1816 assert(event);
1817 assert(channel_name);
1818
1819 /* If we have a filter, we must have its filter expression */
1820 assert(!(!!filter_expression ^ !!filter));
1821
1822 DBG("Enable event command for event \'%s\'", event->name);
1823
1824 rcu_read_lock();
1825
1826 ret = validate_event_name(event->name);
1827 if (ret) {
1828 goto error;
1829 }
1830
1831 switch (domain->type) {
1832 case LTTNG_DOMAIN_KERNEL:
1833 {
1834 struct ltt_kernel_channel *kchan;
1835
1836 /*
1837 * If a non-default channel has been created in the
1838 * session, explicitely require that -c chan_name needs
1839 * to be provided.
1840 */
1841 if (session->kernel_session->has_non_default_channel
1842 && channel_name[0] == '\0') {
1843 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1844 goto error;
1845 }
1846
1847 kchan = trace_kernel_get_channel_by_name(channel_name,
1848 session->kernel_session);
1849 if (kchan == NULL) {
1850 attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL,
1851 LTTNG_BUFFER_GLOBAL);
1852 if (attr == NULL) {
1853 ret = LTTNG_ERR_FATAL;
1854 goto error;
1855 }
1856 if (lttng_strncpy(attr->name, channel_name,
1857 sizeof(attr->name))) {
1858 ret = LTTNG_ERR_INVALID;
1859 goto error;
1860 }
1861
1862 ret = cmd_enable_channel(session, domain, attr, wpipe);
1863 if (ret != LTTNG_OK) {
1864 goto error;
1865 }
1866 channel_created = 1;
1867 }
1868
1869 /* Get the newly created kernel channel pointer */
1870 kchan = trace_kernel_get_channel_by_name(channel_name,
1871 session->kernel_session);
1872 if (kchan == NULL) {
1873 /* This sould not happen... */
1874 ret = LTTNG_ERR_FATAL;
1875 goto error;
1876 }
1877
1878 switch (event->type) {
1879 case LTTNG_EVENT_ALL:
1880 {
1881 char *filter_expression_a = NULL;
1882 struct lttng_filter_bytecode *filter_a = NULL;
1883
1884 /*
1885 * We need to duplicate filter_expression and filter,
1886 * because ownership is passed to first enable
1887 * event.
1888 */
1889 if (filter_expression) {
1890 filter_expression_a = strdup(filter_expression);
1891 if (!filter_expression_a) {
1892 ret = LTTNG_ERR_FATAL;
1893 goto error;
1894 }
1895 }
1896 if (filter) {
1897 filter_a = zmalloc(sizeof(*filter_a) + filter->len);
1898 if (!filter_a) {
1899 free(filter_expression_a);
1900 ret = LTTNG_ERR_FATAL;
1901 goto error;
1902 }
1903 memcpy(filter_a, filter, sizeof(*filter_a) + filter->len);
1904 }
1905 event->type = LTTNG_EVENT_TRACEPOINT; /* Hack */
1906 ret = event_kernel_enable_event(kchan, event,
1907 filter_expression, filter);
1908 /* We have passed ownership */
1909 filter_expression = NULL;
1910 filter = NULL;
1911 if (ret != LTTNG_OK) {
1912 if (channel_created) {
1913 /* Let's not leak a useless channel. */
1914 kernel_destroy_channel(kchan);
1915 }
1916 free(filter_expression_a);
1917 free(filter_a);
1918 goto error;
1919 }
1920 event->type = LTTNG_EVENT_SYSCALL; /* Hack */
1921 ret = event_kernel_enable_event(kchan, event,
1922 filter_expression_a, filter_a);
1923 /* We have passed ownership */
1924 filter_expression_a = NULL;
1925 filter_a = NULL;
1926 if (ret != LTTNG_OK) {
1927 goto error;
1928 }
1929 break;
1930 }
1931 case LTTNG_EVENT_PROBE:
1932 case LTTNG_EVENT_FUNCTION:
1933 case LTTNG_EVENT_FUNCTION_ENTRY:
1934 case LTTNG_EVENT_TRACEPOINT:
1935 ret = event_kernel_enable_event(kchan, event,
1936 filter_expression, filter);
1937 /* We have passed ownership */
1938 filter_expression = NULL;
1939 filter = NULL;
1940 if (ret != LTTNG_OK) {
1941 if (channel_created) {
1942 /* Let's not leak a useless channel. */
1943 kernel_destroy_channel(kchan);
1944 }
1945 goto error;
1946 }
1947 break;
1948 case LTTNG_EVENT_SYSCALL:
1949 ret = event_kernel_enable_event(kchan, event,
1950 filter_expression, filter);
1951 /* We have passed ownership */
1952 filter_expression = NULL;
1953 filter = NULL;
1954 if (ret != LTTNG_OK) {
1955 goto error;
1956 }
1957 break;
1958 default:
1959 ret = LTTNG_ERR_UNK;
1960 goto error;
1961 }
1962
1963 kernel_wait_quiescent(kernel_tracer_fd);
1964 break;
1965 }
1966 case LTTNG_DOMAIN_UST:
1967 {
1968 struct ltt_ust_channel *uchan;
1969 struct ltt_ust_session *usess = session->ust_session;
1970
1971 assert(usess);
1972
1973 /*
1974 * If a non-default channel has been created in the
1975 * session, explicitely require that -c chan_name needs
1976 * to be provided.
1977 */
1978 if (usess->has_non_default_channel && channel_name[0] == '\0') {
1979 ret = LTTNG_ERR_NEED_CHANNEL_NAME;
1980 goto error;
1981 }
1982
1983 /* Get channel from global UST domain */
1984 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
1985 channel_name);
1986 if (uchan == NULL) {
1987 /* Create default channel */
1988 attr = channel_new_default_attr(LTTNG_DOMAIN_UST,
1989 usess->buffer_type);
1990 if (attr == NULL) {
1991 ret = LTTNG_ERR_FATAL;
1992 goto error;
1993 }
1994 if (lttng_strncpy(attr->name, channel_name,
1995 sizeof(attr->name))) {
1996 ret = LTTNG_ERR_INVALID;
1997 goto error;
1998 }
1999
2000 ret = cmd_enable_channel(session, domain, attr, wpipe);
2001 if (ret != LTTNG_OK) {
2002 goto error;
2003 }
2004
2005 /* Get the newly created channel reference back */
2006 uchan = trace_ust_find_channel_by_name(
2007 usess->domain_global.channels, channel_name);
2008 assert(uchan);
2009 }
2010
2011 if (uchan->domain != LTTNG_DOMAIN_UST && !internal_event) {
2012 /*
2013 * Don't allow users to add UST events to channels which
2014 * are assigned to a userspace subdomain (JUL, Log4J,
2015 * Python, etc.).
2016 */
2017 ret = LTTNG_ERR_INVALID_CHANNEL_DOMAIN;
2018 goto error;
2019 }
2020
2021 if (!internal_event) {
2022 /*
2023 * Ensure the event name is not reserved for internal
2024 * use.
2025 */
2026 ret = validate_ust_event_name(event->name);
2027 if (ret) {
2028 WARN("Userspace event name %s failed validation.",
2029 event->name ?
2030 event->name : "NULL");
2031 ret = LTTNG_ERR_INVALID_EVENT_NAME;
2032 goto error;
2033 }
2034 }
2035
2036 /* At this point, the session and channel exist on the tracer */
2037 ret = event_ust_enable_tracepoint(usess, uchan, event,
2038 filter_expression, filter, exclusion,
2039 internal_event);
2040 /* We have passed ownership */
2041 filter_expression = NULL;
2042 filter = NULL;
2043 exclusion = NULL;
2044 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2045 goto already_enabled;
2046 } else if (ret != LTTNG_OK) {
2047 goto error;
2048 }
2049 break;
2050 }
2051 case LTTNG_DOMAIN_LOG4J:
2052 case LTTNG_DOMAIN_JUL:
2053 case LTTNG_DOMAIN_PYTHON:
2054 {
2055 const char *default_event_name, *default_chan_name;
2056 struct agent *agt;
2057 struct lttng_event uevent;
2058 struct lttng_domain tmp_dom;
2059 struct ltt_ust_session *usess = session->ust_session;
2060
2061 assert(usess);
2062
2063 agt = trace_ust_find_agent(usess, domain->type);
2064 if (!agt) {
2065 agt = agent_create(domain->type);
2066 if (!agt) {
2067 ret = LTTNG_ERR_NOMEM;
2068 goto error;
2069 }
2070 agent_add(agt, usess->agents);
2071 }
2072
2073 /* Create the default tracepoint. */
2074 memset(&uevent, 0, sizeof(uevent));
2075 uevent.type = LTTNG_EVENT_TRACEPOINT;
2076 uevent.loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2077 default_event_name = event_get_default_agent_ust_name(
2078 domain->type);
2079 if (!default_event_name) {
2080 ret = LTTNG_ERR_FATAL;
2081 goto error;
2082 }
2083 strncpy(uevent.name, default_event_name, sizeof(uevent.name));
2084 uevent.name[sizeof(uevent.name) - 1] = '\0';
2085
2086 /*
2087 * The domain type is changed because we are about to enable the
2088 * default channel and event for the JUL domain that are hardcoded.
2089 * This happens in the UST domain.
2090 */
2091 memcpy(&tmp_dom, domain, sizeof(tmp_dom));
2092 tmp_dom.type = LTTNG_DOMAIN_UST;
2093
2094 switch (domain->type) {
2095 case LTTNG_DOMAIN_LOG4J:
2096 default_chan_name = DEFAULT_LOG4J_CHANNEL_NAME;
2097 break;
2098 case LTTNG_DOMAIN_JUL:
2099 default_chan_name = DEFAULT_JUL_CHANNEL_NAME;
2100 break;
2101 case LTTNG_DOMAIN_PYTHON:
2102 default_chan_name = DEFAULT_PYTHON_CHANNEL_NAME;
2103 break;
2104 default:
2105 /* The switch/case we are in makes this impossible */
2106 assert(0);
2107 }
2108
2109 {
2110 char *filter_expression_copy = NULL;
2111 struct lttng_filter_bytecode *filter_copy = NULL;
2112
2113 if (filter) {
2114 const size_t filter_size = sizeof(
2115 struct lttng_filter_bytecode)
2116 + filter->len;
2117
2118 filter_copy = zmalloc(filter_size);
2119 if (!filter_copy) {
2120 ret = LTTNG_ERR_NOMEM;
2121 goto error;
2122 }
2123 memcpy(filter_copy, filter, filter_size);
2124
2125 filter_expression_copy =
2126 strdup(filter_expression);
2127 if (!filter_expression) {
2128 ret = LTTNG_ERR_NOMEM;
2129 }
2130
2131 if (!filter_expression_copy || !filter_copy) {
2132 free(filter_expression_copy);
2133 free(filter_copy);
2134 goto error;
2135 }
2136 }
2137
2138 ret = cmd_enable_event_internal(session, &tmp_dom,
2139 (char *) default_chan_name,
2140 &uevent, filter_expression_copy,
2141 filter_copy, NULL, wpipe);
2142 }
2143
2144 if (ret == LTTNG_ERR_UST_EVENT_ENABLED) {
2145 goto already_enabled;
2146 } else if (ret != LTTNG_OK) {
2147 goto error;
2148 }
2149
2150 /* The wild card * means that everything should be enabled. */
2151 if (strncmp(event->name, "*", 1) == 0 && strlen(event->name) == 1) {
2152 ret = event_agent_enable_all(usess, agt, event, filter,
2153 filter_expression);
2154 } else {
2155 ret = event_agent_enable(usess, agt, event, filter,
2156 filter_expression);
2157 }
2158 filter = NULL;
2159 filter_expression = NULL;
2160 if (ret != LTTNG_OK) {
2161 goto error;
2162 }
2163
2164 break;
2165 }
2166 default:
2167 ret = LTTNG_ERR_UND;
2168 goto error;
2169 }
2170
2171 ret = LTTNG_OK;
2172
2173 already_enabled:
2174 error:
2175 free(filter_expression);
2176 free(filter);
2177 free(exclusion);
2178 free(attr);
2179 rcu_read_unlock();
2180 return ret;
2181 }
2182
2183 /*
2184 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2185 * We own filter, exclusion, and filter_expression.
2186 */
2187 int cmd_enable_event(struct ltt_session *session, struct lttng_domain *domain,
2188 char *channel_name, struct lttng_event *event,
2189 char *filter_expression,
2190 struct lttng_filter_bytecode *filter,
2191 struct lttng_event_exclusion *exclusion,
2192 int wpipe)
2193 {
2194 return _cmd_enable_event(session, domain, channel_name, event,
2195 filter_expression, filter, exclusion, wpipe, false);
2196 }
2197
2198 /*
2199 * Enable an event which is internal to LTTng. An internal should
2200 * never be made visible to clients and are immune to checks such as
2201 * reserved names.
2202 */
2203 static int cmd_enable_event_internal(struct ltt_session *session,
2204 struct lttng_domain *domain,
2205 char *channel_name, struct lttng_event *event,
2206 char *filter_expression,
2207 struct lttng_filter_bytecode *filter,
2208 struct lttng_event_exclusion *exclusion,
2209 int wpipe)
2210 {
2211 return _cmd_enable_event(session, domain, channel_name, event,
2212 filter_expression, filter, exclusion, wpipe, true);
2213 }
2214
2215 /*
2216 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2217 */
2218 ssize_t cmd_list_tracepoints(enum lttng_domain_type domain,
2219 struct lttng_event **events)
2220 {
2221 int ret;
2222 ssize_t nb_events = 0;
2223
2224 switch (domain) {
2225 case LTTNG_DOMAIN_KERNEL:
2226 nb_events = kernel_list_events(kernel_tracer_fd, events);
2227 if (nb_events < 0) {
2228 ret = LTTNG_ERR_KERN_LIST_FAIL;
2229 goto error;
2230 }
2231 break;
2232 case LTTNG_DOMAIN_UST:
2233 nb_events = ust_app_list_events(events);
2234 if (nb_events < 0) {
2235 ret = LTTNG_ERR_UST_LIST_FAIL;
2236 goto error;
2237 }
2238 break;
2239 case LTTNG_DOMAIN_LOG4J:
2240 case LTTNG_DOMAIN_JUL:
2241 case LTTNG_DOMAIN_PYTHON:
2242 nb_events = agent_list_events(events, domain);
2243 if (nb_events < 0) {
2244 ret = LTTNG_ERR_UST_LIST_FAIL;
2245 goto error;
2246 }
2247 break;
2248 default:
2249 ret = LTTNG_ERR_UND;
2250 goto error;
2251 }
2252
2253 return nb_events;
2254
2255 error:
2256 /* Return negative value to differentiate return code */
2257 return -ret;
2258 }
2259
2260 /*
2261 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2262 */
2263 ssize_t cmd_list_tracepoint_fields(enum lttng_domain_type domain,
2264 struct lttng_event_field **fields)
2265 {
2266 int ret;
2267 ssize_t nb_fields = 0;
2268
2269 switch (domain) {
2270 case LTTNG_DOMAIN_UST:
2271 nb_fields = ust_app_list_event_fields(fields);
2272 if (nb_fields < 0) {
2273 ret = LTTNG_ERR_UST_LIST_FAIL;
2274 goto error;
2275 }
2276 break;
2277 case LTTNG_DOMAIN_KERNEL:
2278 default: /* fall-through */
2279 ret = LTTNG_ERR_UND;
2280 goto error;
2281 }
2282
2283 return nb_fields;
2284
2285 error:
2286 /* Return negative value to differentiate return code */
2287 return -ret;
2288 }
2289
2290 ssize_t cmd_list_syscalls(struct lttng_event **events)
2291 {
2292 return syscall_table_list(events);
2293 }
2294
2295 /*
2296 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2297 *
2298 * Called with session lock held.
2299 */
2300 ssize_t cmd_list_tracker_pids(struct ltt_session *session,
2301 enum lttng_domain_type domain, int32_t **pids)
2302 {
2303 int ret;
2304 ssize_t nr_pids = 0;
2305
2306 switch (domain) {
2307 case LTTNG_DOMAIN_KERNEL:
2308 {
2309 struct ltt_kernel_session *ksess;
2310
2311 ksess = session->kernel_session;
2312 nr_pids = kernel_list_tracker_pids(ksess, pids);
2313 if (nr_pids < 0) {
2314 ret = LTTNG_ERR_KERN_LIST_FAIL;
2315 goto error;
2316 }
2317 break;
2318 }
2319 case LTTNG_DOMAIN_UST:
2320 {
2321 struct ltt_ust_session *usess;
2322
2323 usess = session->ust_session;
2324 nr_pids = trace_ust_list_tracker_pids(usess, pids);
2325 if (nr_pids < 0) {
2326 ret = LTTNG_ERR_UST_LIST_FAIL;
2327 goto error;
2328 }
2329 break;
2330 }
2331 case LTTNG_DOMAIN_LOG4J:
2332 case LTTNG_DOMAIN_JUL:
2333 case LTTNG_DOMAIN_PYTHON:
2334 default:
2335 ret = LTTNG_ERR_UND;
2336 goto error;
2337 }
2338
2339 return nr_pids;
2340
2341 error:
2342 /* Return negative value to differentiate return code */
2343 return -ret;
2344 }
2345
2346 /*
2347 * Command LTTNG_START_TRACE processed by the client thread.
2348 *
2349 * Called with session mutex held.
2350 */
2351 int cmd_start_trace(struct ltt_session *session)
2352 {
2353 int ret;
2354 unsigned long nb_chan = 0;
2355 struct ltt_kernel_session *ksession;
2356 struct ltt_ust_session *usess;
2357
2358 assert(session);
2359
2360 /* Ease our life a bit ;) */
2361 ksession = session->kernel_session;
2362 usess = session->ust_session;
2363
2364 /* Is the session already started? */
2365 if (session->active) {
2366 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2367 goto error;
2368 }
2369
2370 /*
2371 * Starting a session without channel is useless since after that it's not
2372 * possible to enable channel thus inform the client.
2373 */
2374 if (usess && usess->domain_global.channels) {
2375 nb_chan += lttng_ht_get_count(usess->domain_global.channels);
2376 }
2377 if (ksession) {
2378 nb_chan += ksession->channel_count;
2379 }
2380 if (!nb_chan) {
2381 ret = LTTNG_ERR_NO_CHANNEL;
2382 goto error;
2383 }
2384
2385 /* Kernel tracing */
2386 if (ksession != NULL) {
2387 ret = start_kernel_session(ksession, kernel_tracer_fd);
2388 if (ret != LTTNG_OK) {
2389 goto error;
2390 }
2391 }
2392
2393 /* Flag session that trace should start automatically */
2394 if (usess) {
2395 /*
2396 * Even though the start trace might fail, flag this session active so
2397 * other application coming in are started by default.
2398 */
2399 usess->active = 1;
2400
2401 ret = ust_app_start_trace_all(usess);
2402 if (ret < 0) {
2403 ret = LTTNG_ERR_UST_START_FAIL;
2404 goto error;
2405 }
2406 }
2407
2408 /* Flag this after a successful start. */
2409 session->has_been_started = 1;
2410 session->active = 1;
2411
2412 ret = LTTNG_OK;
2413
2414 error:
2415 return ret;
2416 }
2417
2418 /*
2419 * Command LTTNG_STOP_TRACE processed by the client thread.
2420 */
2421 int cmd_stop_trace(struct ltt_session *session)
2422 {
2423 int ret;
2424 struct ltt_kernel_channel *kchan;
2425 struct ltt_kernel_session *ksession;
2426 struct ltt_ust_session *usess;
2427
2428 assert(session);
2429
2430 /* Short cut */
2431 ksession = session->kernel_session;
2432 usess = session->ust_session;
2433
2434 /* Session is not active. Skip everythong and inform the client. */
2435 if (!session->active) {
2436 ret = LTTNG_ERR_TRACE_ALREADY_STOPPED;
2437 goto error;
2438 }
2439
2440 /* Kernel tracer */
2441 if (ksession && ksession->active) {
2442 DBG("Stop kernel tracing");
2443
2444 ret = kernel_stop_session(ksession);
2445 if (ret < 0) {
2446 ret = LTTNG_ERR_KERN_STOP_FAIL;
2447 goto error;
2448 }
2449
2450 kernel_wait_quiescent(kernel_tracer_fd);
2451
2452 /* Flush metadata after stopping (if exists) */
2453 if (ksession->metadata_stream_fd >= 0) {
2454 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2455 if (ret < 0) {
2456 ERR("Kernel metadata flush failed");
2457 }
2458 }
2459
2460 /* Flush all buffers after stopping */
2461 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2462 ret = kernel_flush_buffer(kchan);
2463 if (ret < 0) {
2464 ERR("Kernel flush buffer error");
2465 }
2466 }
2467
2468 ksession->active = 0;
2469 }
2470
2471 if (usess && usess->active) {
2472 /*
2473 * Even though the stop trace might fail, flag this session inactive so
2474 * other application coming in are not started by default.
2475 */
2476 usess->active = 0;
2477
2478 ret = ust_app_stop_trace_all(usess);
2479 if (ret < 0) {
2480 ret = LTTNG_ERR_UST_STOP_FAIL;
2481 goto error;
2482 }
2483 }
2484
2485 /* Flag inactive after a successful stop. */
2486 session->active = 0;
2487 ret = LTTNG_OK;
2488
2489 error:
2490 return ret;
2491 }
2492
2493 /*
2494 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2495 */
2496 int cmd_set_consumer_uri(struct ltt_session *session, size_t nb_uri,
2497 struct lttng_uri *uris)
2498 {
2499 int ret, i;
2500 struct ltt_kernel_session *ksess = session->kernel_session;
2501 struct ltt_ust_session *usess = session->ust_session;
2502
2503 assert(session);
2504 assert(uris);
2505 assert(nb_uri > 0);
2506
2507 /* Can't set consumer URI if the session is active. */
2508 if (session->active) {
2509 ret = LTTNG_ERR_TRACE_ALREADY_STARTED;
2510 goto error;
2511 }
2512
2513 /* Set the "global" consumer URIs */
2514 for (i = 0; i < nb_uri; i++) {
2515 ret = add_uri_to_consumer(session->consumer,
2516 &uris[i], 0, session->name);
2517 if (ret != LTTNG_OK) {
2518 goto error;
2519 }
2520 }
2521
2522 /* Set UST session URIs */
2523 if (session->ust_session) {
2524 for (i = 0; i < nb_uri; i++) {
2525 ret = add_uri_to_consumer(
2526 session->ust_session->consumer,
2527 &uris[i], LTTNG_DOMAIN_UST,
2528 session->name);
2529 if (ret != LTTNG_OK) {
2530 goto error;
2531 }
2532 }
2533 }
2534
2535 /* Set kernel session URIs */
2536 if (session->kernel_session) {
2537 for (i = 0; i < nb_uri; i++) {
2538 ret = add_uri_to_consumer(
2539 session->kernel_session->consumer,
2540 &uris[i], LTTNG_DOMAIN_KERNEL,
2541 session->name);
2542 if (ret != LTTNG_OK) {
2543 goto error;
2544 }
2545 }
2546 }
2547
2548 /*
2549 * Make sure to set the session in output mode after we set URI since a
2550 * session can be created without URL (thus flagged in no output mode).
2551 */
2552 session->output_traces = 1;
2553 if (ksess) {
2554 ksess->output_traces = 1;
2555 }
2556
2557 if (usess) {
2558 usess->output_traces = 1;
2559 }
2560
2561 /* All good! */
2562 ret = LTTNG_OK;
2563
2564 error:
2565 return ret;
2566 }
2567
2568 /*
2569 * Command LTTNG_CREATE_SESSION processed by the client thread.
2570 */
2571 int cmd_create_session_uri(char *name, struct lttng_uri *uris,
2572 size_t nb_uri, lttng_sock_cred *creds, unsigned int live_timer)
2573 {
2574 int ret;
2575 struct ltt_session *session;
2576
2577 assert(name);
2578 assert(creds);
2579
2580 /*
2581 * Verify if the session already exist
2582 *
2583 * XXX: There is no need for the session lock list here since the caller
2584 * (process_client_msg) is holding it. We might want to change that so a
2585 * single command does not lock the entire session list.
2586 */
2587 session = session_find_by_name(name);
2588 if (session != NULL) {
2589 ret = LTTNG_ERR_EXIST_SESS;
2590 goto find_error;
2591 }
2592
2593 /* Create tracing session in the registry */
2594 ret = session_create(name, LTTNG_SOCK_GET_UID_CRED(creds),
2595 LTTNG_SOCK_GET_GID_CRED(creds));
2596 if (ret != LTTNG_OK) {
2597 goto session_error;
2598 }
2599
2600 /*
2601 * Get the newly created session pointer back
2602 *
2603 * XXX: There is no need for the session lock list here since the caller
2604 * (process_client_msg) is holding it. We might want to change that so a
2605 * single command does not lock the entire session list.
2606 */
2607 session = session_find_by_name(name);
2608 assert(session);
2609
2610 session->live_timer = live_timer;
2611 /* Create default consumer output for the session not yet created. */
2612 session->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
2613 if (session->consumer == NULL) {
2614 ret = LTTNG_ERR_FATAL;
2615 goto consumer_error;
2616 }
2617
2618 if (uris) {
2619 ret = cmd_set_consumer_uri(session, nb_uri, uris);
2620 if (ret != LTTNG_OK) {
2621 goto consumer_error;
2622 }
2623 session->output_traces = 1;
2624 } else {
2625 session->output_traces = 0;
2626 DBG2("Session %s created with no output", session->name);
2627 }
2628
2629 session->consumer->enabled = 1;
2630
2631 return LTTNG_OK;
2632
2633 consumer_error:
2634 session_destroy(session);
2635 session_error:
2636 find_error:
2637 return ret;
2638 }
2639
2640 /*
2641 * Command LTTNG_CREATE_SESSION_SNAPSHOT processed by the client thread.
2642 */
2643 int cmd_create_session_snapshot(char *name, struct lttng_uri *uris,
2644 size_t nb_uri, lttng_sock_cred *creds)
2645 {
2646 int ret;
2647 struct ltt_session *session;
2648 struct snapshot_output *new_output = NULL;
2649
2650 assert(name);
2651 assert(creds);
2652
2653 /*
2654 * Create session in no output mode with URIs set to NULL. The uris we've
2655 * received are for a default snapshot output if one.
2656 */
2657 ret = cmd_create_session_uri(name, NULL, 0, creds, 0);
2658 if (ret != LTTNG_OK) {
2659 goto error;
2660 }
2661
2662 /* Get the newly created session pointer back. This should NEVER fail. */
2663 session = session_find_by_name(name);
2664 assert(session);
2665
2666 /* Flag session for snapshot mode. */
2667 session->snapshot_mode = 1;
2668
2669 /* Skip snapshot output creation if no URI is given. */
2670 if (nb_uri == 0) {
2671 goto end;
2672 }
2673
2674 new_output = snapshot_output_alloc();
2675 if (!new_output) {
2676 ret = LTTNG_ERR_NOMEM;
2677 goto error_snapshot_alloc;
2678 }
2679
2680 ret = snapshot_output_init_with_uri(DEFAULT_SNAPSHOT_MAX_SIZE, NULL,
2681 uris, nb_uri, session->consumer, new_output, &session->snapshot);
2682 if (ret < 0) {
2683 if (ret == -ENOMEM) {
2684 ret = LTTNG_ERR_NOMEM;
2685 } else {
2686 ret = LTTNG_ERR_INVALID;
2687 }
2688 goto error_snapshot;
2689 }
2690
2691 rcu_read_lock();
2692 snapshot_add_output(&session->snapshot, new_output);
2693 rcu_read_unlock();
2694
2695 end:
2696 return LTTNG_OK;
2697
2698 error_snapshot:
2699 snapshot_output_destroy(new_output);
2700 error_snapshot_alloc:
2701 session_destroy(session);
2702 error:
2703 return ret;
2704 }
2705
2706 /*
2707 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2708 *
2709 * Called with session lock held.
2710 */
2711 int cmd_destroy_session(struct ltt_session *session, int wpipe)
2712 {
2713 int ret;
2714 struct ltt_ust_session *usess;
2715 struct ltt_kernel_session *ksess;
2716
2717 /* Safety net */
2718 assert(session);
2719
2720 usess = session->ust_session;
2721 ksess = session->kernel_session;
2722
2723 /* Clean kernel session teardown */
2724 kernel_destroy_session(ksess);
2725
2726 /* UST session teardown */
2727 if (usess) {
2728 /* Close any relayd session */
2729 consumer_output_send_destroy_relayd(usess->consumer);
2730
2731 /* Destroy every UST application related to this session. */
2732 ret = ust_app_destroy_trace_all(usess);
2733 if (ret) {
2734 ERR("Error in ust_app_destroy_trace_all");
2735 }
2736
2737 /* Clean up the rest. */
2738 trace_ust_destroy_session(usess);
2739 }
2740
2741 /*
2742 * Must notify the kernel thread here to update it's poll set in order to
2743 * remove the channel(s)' fd just destroyed.
2744 */
2745 ret = notify_thread_pipe(wpipe);
2746 if (ret < 0) {
2747 PERROR("write kernel poll pipe");
2748 }
2749
2750 ret = session_destroy(session);
2751
2752 return ret;
2753 }
2754
2755 /*
2756 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2757 */
2758 int cmd_register_consumer(struct ltt_session *session,
2759 enum lttng_domain_type domain, const char *sock_path,
2760 struct consumer_data *cdata)
2761 {
2762 int ret, sock;
2763 struct consumer_socket *socket = NULL;
2764
2765 assert(session);
2766 assert(cdata);
2767 assert(sock_path);
2768
2769 switch (domain) {
2770 case LTTNG_DOMAIN_KERNEL:
2771 {
2772 struct ltt_kernel_session *ksess = session->kernel_session;
2773
2774 assert(ksess);
2775
2776 /* Can't register a consumer if there is already one */
2777 if (ksess->consumer_fds_sent != 0) {
2778 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2779 goto error;
2780 }
2781
2782 sock = lttcomm_connect_unix_sock(sock_path);
2783 if (sock < 0) {
2784 ret = LTTNG_ERR_CONNECT_FAIL;
2785 goto error;
2786 }
2787 cdata->cmd_sock = sock;
2788
2789 socket = consumer_allocate_socket(&cdata->cmd_sock);
2790 if (socket == NULL) {
2791 ret = close(sock);
2792 if (ret < 0) {
2793 PERROR("close register consumer");
2794 }
2795 cdata->cmd_sock = -1;
2796 ret = LTTNG_ERR_FATAL;
2797 goto error;
2798 }
2799
2800 socket->lock = zmalloc(sizeof(pthread_mutex_t));
2801 if (socket->lock == NULL) {
2802 PERROR("zmalloc pthread mutex");
2803 ret = LTTNG_ERR_FATAL;
2804 goto error;
2805 }
2806 pthread_mutex_init(socket->lock, NULL);
2807 socket->registered = 1;
2808
2809 rcu_read_lock();
2810 consumer_add_socket(socket, ksess->consumer);
2811 rcu_read_unlock();
2812
2813 pthread_mutex_lock(&cdata->pid_mutex);
2814 cdata->pid = -1;
2815 pthread_mutex_unlock(&cdata->pid_mutex);
2816
2817 break;
2818 }
2819 default:
2820 /* TODO: Userspace tracing */
2821 ret = LTTNG_ERR_UND;
2822 goto error;
2823 }
2824
2825 return LTTNG_OK;
2826
2827 error:
2828 if (socket) {
2829 consumer_destroy_socket(socket);
2830 }
2831 return ret;
2832 }
2833
2834 /*
2835 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2836 */
2837 ssize_t cmd_list_domains(struct ltt_session *session,
2838 struct lttng_domain **domains)
2839 {
2840 int ret, index = 0;
2841 ssize_t nb_dom = 0;
2842 struct agent *agt;
2843 struct lttng_ht_iter iter;
2844
2845 if (session->kernel_session != NULL) {
2846 DBG3("Listing domains found kernel domain");
2847 nb_dom++;
2848 }
2849
2850 if (session->ust_session != NULL) {
2851 DBG3("Listing domains found UST global domain");
2852 nb_dom++;
2853
2854 rcu_read_lock();
2855 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2856 agt, node.node) {
2857 if (agt->being_used) {
2858 nb_dom++;
2859 }
2860 }
2861 rcu_read_unlock();
2862 }
2863
2864 if (!nb_dom) {
2865 goto end;
2866 }
2867
2868 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2869 if (*domains == NULL) {
2870 ret = LTTNG_ERR_FATAL;
2871 goto error;
2872 }
2873
2874 if (session->kernel_session != NULL) {
2875 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2876
2877 /* Kernel session buffer type is always GLOBAL */
2878 (*domains)[index].buf_type = LTTNG_BUFFER_GLOBAL;
2879
2880 index++;
2881 }
2882
2883 if (session->ust_session != NULL) {
2884 (*domains)[index].type = LTTNG_DOMAIN_UST;
2885 (*domains)[index].buf_type = session->ust_session->buffer_type;
2886 index++;
2887
2888 rcu_read_lock();
2889 cds_lfht_for_each_entry(session->ust_session->agents->ht, &iter.iter,
2890 agt, node.node) {
2891 if (agt->being_used) {
2892 (*domains)[index].type = agt->domain;
2893 (*domains)[index].buf_type = session->ust_session->buffer_type;
2894 index++;
2895 }
2896 }
2897 rcu_read_unlock();
2898 }
2899 end:
2900 return nb_dom;
2901
2902 error:
2903 /* Return negative value to differentiate return code */
2904 return -ret;
2905 }
2906
2907
2908 /*
2909 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2910 */
2911 ssize_t cmd_list_channels(enum lttng_domain_type domain,
2912 struct ltt_session *session, struct lttng_channel **channels)
2913 {
2914 ssize_t nb_chan = 0, payload_size = 0, ret;
2915
2916 switch (domain) {
2917 case LTTNG_DOMAIN_KERNEL:
2918 if (session->kernel_session != NULL) {
2919 nb_chan = session->kernel_session->channel_count;
2920 }
2921 DBG3("Number of kernel channels %zd", nb_chan);
2922 if (nb_chan <= 0) {
2923 ret = -LTTNG_ERR_KERN_CHAN_NOT_FOUND;
2924 goto end;
2925 }
2926 break;
2927 case LTTNG_DOMAIN_UST:
2928 if (session->ust_session != NULL) {
2929 rcu_read_lock();
2930 nb_chan = lttng_ht_get_count(
2931 session->ust_session->domain_global.channels);
2932 rcu_read_unlock();
2933 }
2934 DBG3("Number of UST global channels %zd", nb_chan);
2935 if (nb_chan < 0) {
2936 ret = -LTTNG_ERR_UST_CHAN_NOT_FOUND;
2937 goto end;
2938 }
2939 break;
2940 default:
2941 ret = -LTTNG_ERR_UND;
2942 goto end;
2943 }
2944
2945 if (nb_chan > 0) {
2946 const size_t channel_size = sizeof(struct lttng_channel) +
2947 sizeof(struct lttcomm_channel_extended);
2948 struct lttcomm_channel_extended *channel_exts;
2949
2950 payload_size = nb_chan * channel_size;
2951 *channels = zmalloc(payload_size);
2952 if (*channels == NULL) {
2953 ret = -LTTNG_ERR_FATAL;
2954 goto end;
2955 }
2956
2957 channel_exts = ((void *) *channels) +
2958 (nb_chan * sizeof(struct lttng_channel));
2959 ret = list_lttng_channels(domain, session, *channels, channel_exts);
2960 if (ret != LTTNG_OK) {
2961 free(*channels);
2962 *channels = NULL;
2963 goto end;
2964 }
2965 } else {
2966 *channels = NULL;
2967 }
2968
2969 ret = payload_size;
2970 end:
2971 return ret;
2972 }
2973
2974 /*
2975 * Command LTTNG_LIST_EVENTS processed by the client thread.
2976 */
2977 ssize_t cmd_list_events(enum lttng_domain_type domain,
2978 struct ltt_session *session, char *channel_name,
2979 struct lttng_event **events, size_t *total_size)
2980 {
2981 int ret = 0;
2982 ssize_t nb_event = 0;
2983
2984 switch (domain) {
2985 case LTTNG_DOMAIN_KERNEL:
2986 if (session->kernel_session != NULL) {
2987 nb_event = list_lttng_kernel_events(channel_name,
2988 session->kernel_session, events,
2989 total_size);
2990 }
2991 break;
2992 case LTTNG_DOMAIN_UST:
2993 {
2994 if (session->ust_session != NULL) {
2995 nb_event = list_lttng_ust_global_events(channel_name,
2996 &session->ust_session->domain_global, events,
2997 total_size);
2998 }
2999 break;
3000 }
3001 case LTTNG_DOMAIN_LOG4J:
3002 case LTTNG_DOMAIN_JUL:
3003 case LTTNG_DOMAIN_PYTHON:
3004 if (session->ust_session) {
3005 struct lttng_ht_iter iter;
3006 struct agent *agt;
3007
3008 rcu_read_lock();
3009 cds_lfht_for_each_entry(session->ust_session->agents->ht,
3010 &iter.iter, agt, node.node) {
3011 if (agt->domain == domain) {
3012 nb_event = list_lttng_agent_events(
3013 agt, events,
3014 total_size);
3015 break;
3016 }
3017 }
3018 rcu_read_unlock();
3019 }
3020 break;
3021 default:
3022 ret = LTTNG_ERR_UND;
3023 goto error;
3024 }
3025
3026 return nb_event;
3027
3028 error:
3029 /* Return negative value to differentiate return code */
3030 return -ret;
3031 }
3032
3033 /*
3034 * Using the session list, filled a lttng_session array to send back to the
3035 * client for session listing.
3036 *
3037 * The session list lock MUST be acquired before calling this function. Use
3038 * session_lock_list() and session_unlock_list().
3039 */
3040 void cmd_list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
3041 gid_t gid)
3042 {
3043 int ret;
3044 unsigned int i = 0;
3045 struct ltt_session *session;
3046 struct ltt_session_list *list = session_get_list();
3047
3048 DBG("Getting all available session for UID %d GID %d",
3049 uid, gid);
3050 /*
3051 * Iterate over session list and append data after the control struct in
3052 * the buffer.
3053 */
3054 cds_list_for_each_entry(session, &list->head, list) {
3055 /*
3056 * Only list the sessions the user can control.
3057 */
3058 if (!session_access_ok(session, uid, gid)) {
3059 continue;
3060 }
3061
3062 struct ltt_kernel_session *ksess = session->kernel_session;
3063 struct ltt_ust_session *usess = session->ust_session;
3064
3065 if (session->consumer->type == CONSUMER_DST_NET ||
3066 (ksess && ksess->consumer->type == CONSUMER_DST_NET) ||
3067 (usess && usess->consumer->type == CONSUMER_DST_NET)) {
3068 ret = build_network_session_path(sessions[i].path,
3069 sizeof(sessions[i].path), session);
3070 } else {
3071 ret = snprintf(sessions[i].path, sizeof(sessions[i].path), "%s",
3072 session->consumer->dst.trace_path);
3073 }
3074 if (ret < 0) {
3075 PERROR("snprintf session path");
3076 continue;
3077 }
3078
3079 strncpy(sessions[i].name, session->name, NAME_MAX);
3080 sessions[i].name[NAME_MAX - 1] = '\0';
3081 sessions[i].enabled = session->active;
3082 sessions[i].snapshot_mode = session->snapshot_mode;
3083 sessions[i].live_timer_interval = session->live_timer;
3084 i++;
3085 }
3086 }
3087
3088 /*
3089 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3090 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3091 */
3092 int cmd_data_pending(struct ltt_session *session)
3093 {
3094 int ret;
3095 struct ltt_kernel_session *ksess = session->kernel_session;
3096 struct ltt_ust_session *usess = session->ust_session;
3097
3098 assert(session);
3099
3100 /* Session MUST be stopped to ask for data availability. */
3101 if (session->active) {
3102 ret = LTTNG_ERR_SESSION_STARTED;
3103 goto error;
3104 } else {
3105 /*
3106 * If stopped, just make sure we've started before else the above call
3107 * will always send that there is data pending.
3108 *
3109 * The consumer assumes that when the data pending command is received,
3110 * the trace has been started before or else no output data is written
3111 * by the streams which is a condition for data pending. So, this is
3112 * *VERY* important that we don't ask the consumer before a start
3113 * trace.
3114 */
3115 if (!session->has_been_started) {
3116 ret = 0;
3117 goto error;
3118 }
3119 }
3120
3121 if (ksess && ksess->consumer) {
3122 ret = consumer_is_data_pending(ksess->id, ksess->consumer);
3123 if (ret == 1) {
3124 /* Data is still being extracted for the kernel. */
3125 goto error;
3126 }
3127 }
3128
3129 if (usess && usess->consumer) {
3130 ret = consumer_is_data_pending(usess->id, usess->consumer);
3131 if (ret == 1) {
3132 /* Data is still being extracted for the kernel. */
3133 goto error;
3134 }
3135 }
3136
3137 /* Data is ready to be read by a viewer */
3138 ret = 0;
3139
3140 error:
3141 return ret;
3142 }
3143
3144 /*
3145 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3146 *
3147 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3148 */
3149 int cmd_snapshot_add_output(struct ltt_session *session,
3150 struct lttng_snapshot_output *output, uint32_t *id)
3151 {
3152 int ret;
3153 struct snapshot_output *new_output;
3154
3155 assert(session);
3156 assert(output);
3157
3158 DBG("Cmd snapshot add output for session %s", session->name);
3159
3160 /*
3161 * Can't create an output if the session is not set in no-output mode.
3162 */
3163 if (session->output_traces) {
3164 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3165 goto error;
3166 }
3167
3168 /* Only one output is allowed until we have the "tee" feature. */
3169 if (session->snapshot.nb_output == 1) {
3170 ret = LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST;
3171 goto error;
3172 }
3173
3174 new_output = snapshot_output_alloc();
3175 if (!new_output) {
3176 ret = LTTNG_ERR_NOMEM;
3177 goto error;
3178 }
3179
3180 ret = snapshot_output_init(output->max_size, output->name,
3181 output->ctrl_url, output->data_url, session->consumer, new_output,
3182 &session->snapshot);
3183 if (ret < 0) {
3184 if (ret == -ENOMEM) {
3185 ret = LTTNG_ERR_NOMEM;
3186 } else {
3187 ret = LTTNG_ERR_INVALID;
3188 }
3189 goto free_error;
3190 }
3191
3192 rcu_read_lock();
3193 snapshot_add_output(&session->snapshot, new_output);
3194 if (id) {
3195 *id = new_output->id;
3196 }
3197 rcu_read_unlock();
3198
3199 return LTTNG_OK;
3200
3201 free_error:
3202 snapshot_output_destroy(new_output);
3203 error:
3204 return ret;
3205 }
3206
3207 /*
3208 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3209 *
3210 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3211 */
3212 int cmd_snapshot_del_output(struct ltt_session *session,
3213 struct lttng_snapshot_output *output)
3214 {
3215 int ret;
3216 struct snapshot_output *sout = NULL;
3217
3218 assert(session);
3219 assert(output);
3220
3221 rcu_read_lock();
3222
3223 /*
3224 * Permission denied to create an output if the session is not
3225 * set in no output mode.
3226 */
3227 if (session->output_traces) {
3228 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3229 goto error;
3230 }
3231
3232 if (output->id) {
3233 DBG("Cmd snapshot del output id %" PRIu32 " for session %s", output->id,
3234 session->name);
3235 sout = snapshot_find_output_by_id(output->id, &session->snapshot);
3236 } else if (*output->name != '\0') {
3237 DBG("Cmd snapshot del output name %s for session %s", output->name,
3238 session->name);
3239 sout = snapshot_find_output_by_name(output->name, &session->snapshot);
3240 }
3241 if (!sout) {
3242 ret = LTTNG_ERR_INVALID;
3243 goto error;
3244 }
3245
3246 snapshot_delete_output(&session->snapshot, sout);
3247 snapshot_output_destroy(sout);
3248 ret = LTTNG_OK;
3249
3250 error:
3251 rcu_read_unlock();
3252 return ret;
3253 }
3254
3255 /*
3256 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3257 *
3258 * If no output is available, outputs is untouched and 0 is returned.
3259 *
3260 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3261 */
3262 ssize_t cmd_snapshot_list_outputs(struct ltt_session *session,
3263 struct lttng_snapshot_output **outputs)
3264 {
3265 int ret, idx = 0;
3266 struct lttng_snapshot_output *list = NULL;
3267 struct lttng_ht_iter iter;
3268 struct snapshot_output *output;
3269
3270 assert(session);
3271 assert(outputs);
3272
3273 DBG("Cmd snapshot list outputs for session %s", session->name);
3274
3275 /*
3276 * Permission denied to create an output if the session is not
3277 * set in no output mode.
3278 */
3279 if (session->output_traces) {
3280 ret = -LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3281 goto end;
3282 }
3283
3284 if (session->snapshot.nb_output == 0) {
3285 ret = 0;
3286 goto end;
3287 }
3288
3289 list = zmalloc(session->snapshot.nb_output * sizeof(*list));
3290 if (!list) {
3291 ret = -LTTNG_ERR_NOMEM;
3292 goto end;
3293 }
3294
3295 /* Copy list from session to the new list object. */
3296 rcu_read_lock();
3297 cds_lfht_for_each_entry(session->snapshot.output_ht->ht, &iter.iter,
3298 output, node.node) {
3299 assert(output->consumer);
3300 list[idx].id = output->id;
3301 list[idx].max_size = output->max_size;
3302 if (lttng_strncpy(list[idx].name, output->name,
3303 sizeof(list[idx].name))) {
3304 ret = -LTTNG_ERR_INVALID;
3305 goto error;
3306 }
3307 if (output->consumer->type == CONSUMER_DST_LOCAL) {
3308 if (lttng_strncpy(list[idx].ctrl_url,
3309 output->consumer->dst.trace_path,
3310 sizeof(list[idx].ctrl_url))) {
3311 ret = -LTTNG_ERR_INVALID;
3312 goto error;
3313 }
3314 } else {
3315 /* Control URI. */
3316 ret = uri_to_str_url(&output->consumer->dst.net.control,
3317 list[idx].ctrl_url, sizeof(list[idx].ctrl_url));
3318 if (ret < 0) {
3319 ret = -LTTNG_ERR_NOMEM;
3320 goto error;
3321 }
3322
3323 /* Data URI. */
3324 ret = uri_to_str_url(&output->consumer->dst.net.data,
3325 list[idx].data_url, sizeof(list[idx].data_url));
3326 if (ret < 0) {
3327 ret = -LTTNG_ERR_NOMEM;
3328 goto error;
3329 }
3330 }
3331 idx++;
3332 }
3333
3334 *outputs = list;
3335 list = NULL;
3336 ret = session->snapshot.nb_output;
3337 error:
3338 rcu_read_unlock();
3339 free(list);
3340 end:
3341 return ret;
3342 }
3343
3344 /*
3345 * Check if we can regenerate the metadata for this session.
3346 * Only kernel, UST per-uid and non-live sessions are supported.
3347 *
3348 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3349 */
3350 static
3351 int check_regenerate_metadata_support(struct ltt_session *session)
3352 {
3353 int ret;
3354
3355 assert(session);
3356
3357 if (session->live_timer != 0) {
3358 ret = LTTNG_ERR_LIVE_SESSION;
3359 goto end;
3360 }
3361 if (!session->active) {
3362 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3363 goto end;
3364 }
3365 if (session->ust_session) {
3366 switch (session->ust_session->buffer_type) {
3367 case LTTNG_BUFFER_PER_UID:
3368 break;
3369 case LTTNG_BUFFER_PER_PID:
3370 ret = LTTNG_ERR_PER_PID_SESSION;
3371 goto end;
3372 default:
3373 assert(0);
3374 ret = LTTNG_ERR_UNK;
3375 goto end;
3376 }
3377 }
3378 if (session->consumer->type == CONSUMER_DST_NET &&
3379 session->consumer->relay_minor_version < 8) {
3380 ret = LTTNG_ERR_RELAYD_VERSION_FAIL;
3381 goto end;
3382 }
3383 ret = 0;
3384
3385 end:
3386 return ret;
3387 }
3388
3389 static
3390 int clear_metadata_file(int fd)
3391 {
3392 int ret;
3393
3394 ret = lseek(fd, 0, SEEK_SET);
3395 if (ret < 0) {
3396 PERROR("lseek");
3397 goto end;
3398 }
3399
3400 ret = ftruncate(fd, 0);
3401 if (ret < 0) {
3402 PERROR("ftruncate");
3403 goto end;
3404 }
3405
3406 end:
3407 return ret;
3408 }
3409
3410 static
3411 int ust_regenerate_metadata(struct ltt_ust_session *usess)
3412 {
3413 int ret = 0;
3414 struct buffer_reg_uid *uid_reg = NULL;
3415 struct buffer_reg_session *session_reg = NULL;
3416
3417 rcu_read_lock();
3418 cds_list_for_each_entry(uid_reg, &usess->buffer_reg_uid_list, lnode) {
3419 struct ust_registry_session *registry;
3420 struct ust_registry_channel *chan;
3421 struct lttng_ht_iter iter_chan;
3422
3423 session_reg = uid_reg->registry;
3424 registry = session_reg->reg.ust;
3425
3426 pthread_mutex_lock(&registry->lock);
3427 registry->metadata_len_sent = 0;
3428 memset(registry->metadata, 0, registry->metadata_alloc_len);
3429 registry->metadata_len = 0;
3430 registry->metadata_version++;
3431 if (registry->metadata_fd > 0) {
3432 /* Clear the metadata file's content. */
3433 ret = clear_metadata_file(registry->metadata_fd);
3434 if (ret) {
3435 pthread_mutex_unlock(&registry->lock);
3436 goto end;
3437 }
3438 }
3439
3440 ret = ust_metadata_session_statedump(registry, NULL,
3441 registry->major, registry->minor);
3442 if (ret) {
3443 pthread_mutex_unlock(&registry->lock);
3444 ERR("Failed to generate session metadata (err = %d)",
3445 ret);
3446 goto end;
3447 }
3448 cds_lfht_for_each_entry(registry->channels->ht, &iter_chan.iter,
3449 chan, node.node) {
3450 struct ust_registry_event *event;
3451 struct lttng_ht_iter iter_event;
3452
3453 ret = ust_metadata_channel_statedump(registry, chan);
3454 if (ret) {
3455 pthread_mutex_unlock(&registry->lock);
3456 ERR("Failed to generate channel metadata "
3457 "(err = %d)", ret);
3458 goto end;
3459 }
3460 cds_lfht_for_each_entry(chan->ht->ht, &iter_event.iter,
3461 event, node.node) {
3462 ret = ust_metadata_event_statedump(registry,
3463 chan, event);
3464 if (ret) {
3465 pthread_mutex_unlock(&registry->lock);
3466 ERR("Failed to generate event metadata "
3467 "(err = %d)", ret);
3468 goto end;
3469 }
3470 }
3471 }
3472 pthread_mutex_unlock(&registry->lock);
3473 }
3474
3475 end:
3476 rcu_read_unlock();
3477 return ret;
3478 }
3479
3480 /*
3481 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
3482 *
3483 * Ask the consumer to truncate the existing metadata file(s) and
3484 * then regenerate the metadata. Live and per-pid sessions are not
3485 * supported and return an error.
3486 *
3487 * Return 0 on success or else a LTTNG_ERR code.
3488 */
3489 int cmd_regenerate_metadata(struct ltt_session *session)
3490 {
3491 int ret;
3492
3493 assert(session);
3494
3495 ret = check_regenerate_metadata_support(session);
3496 if (ret) {
3497 goto end;
3498 }
3499
3500 if (session->kernel_session) {
3501 ret = kernctl_session_regenerate_metadata(
3502 session->kernel_session->fd);
3503 if (ret < 0) {
3504 ERR("Failed to regenerate the kernel metadata");
3505 goto end;
3506 }
3507 }
3508
3509 if (session->ust_session) {
3510 ret = ust_regenerate_metadata(session->ust_session);
3511 if (ret < 0) {
3512 ERR("Failed to regenerate the UST metadata");
3513 goto end;
3514 }
3515 }
3516 DBG("Cmd metadata regenerate for session %s", session->name);
3517 ret = LTTNG_OK;
3518
3519 end:
3520 return ret;
3521 }
3522
3523 /*
3524 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
3525 *
3526 * Ask the tracer to regenerate a new statedump.
3527 *
3528 * Return 0 on success or else a LTTNG_ERR code.
3529 */
3530 int cmd_regenerate_statedump(struct ltt_session *session)
3531 {
3532 int ret;
3533
3534 assert(session);
3535
3536 if (!session->active) {
3537 ret = LTTNG_ERR_SESSION_NOT_STARTED;
3538 goto end;
3539 }
3540 ret = 0;
3541
3542 if (session->kernel_session) {
3543 ret = kernctl_session_regenerate_statedump(
3544 session->kernel_session->fd);
3545 /*
3546 * Currently, the statedump in kernel can only fail if out
3547 * of memory.
3548 */
3549 if (ret < 0) {
3550 if (ret == -ENOMEM) {
3551 ret = LTTNG_ERR_REGEN_STATEDUMP_NOMEM;
3552 } else {
3553 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
3554 }
3555 ERR("Failed to regenerate the kernel statedump");
3556 goto end;
3557 }
3558 }
3559
3560 if (session->ust_session) {
3561 ret = ust_app_regenerate_statedump_all(session->ust_session);
3562 /*
3563 * Currently, the statedump in UST always returns 0.
3564 */
3565 if (ret < 0) {
3566 ret = LTTNG_ERR_REGEN_STATEDUMP_FAIL;
3567 ERR("Failed to regenerate the UST statedump");
3568 goto end;
3569 }
3570 }
3571 DBG("Cmd regenerate statedump for session %s", session->name);
3572 ret = LTTNG_OK;
3573
3574 end:
3575 return ret;
3576 }
3577
3578 /*
3579 * Send relayd sockets from snapshot output to consumer. Ignore request if the
3580 * snapshot output is *not* set with a remote destination.
3581 *
3582 * Return 0 on success or a LTTNG_ERR code.
3583 */
3584 static int set_relayd_for_snapshot(struct consumer_output *consumer,
3585 struct snapshot_output *snap_output, struct ltt_session *session)
3586 {
3587 int ret = LTTNG_OK;
3588 struct lttng_ht_iter iter;
3589 struct consumer_socket *socket;
3590
3591 assert(consumer);
3592 assert(snap_output);
3593 assert(session);
3594
3595 DBG2("Set relayd object from snapshot output");
3596
3597 /* Ignore if snapshot consumer output is not network. */
3598 if (snap_output->consumer->type != CONSUMER_DST_NET) {
3599 goto error;
3600 }
3601
3602 /*
3603 * For each consumer socket, create and send the relayd object of the
3604 * snapshot output.
3605 */
3606 rcu_read_lock();
3607 cds_lfht_for_each_entry(snap_output->consumer->socks->ht, &iter.iter,
3608 socket, node.node) {
3609 ret = send_consumer_relayd_sockets(0, session->id,
3610 snap_output->consumer, socket,
3611 session->name, session->hostname,
3612 session->live_timer);
3613 if (ret != LTTNG_OK) {
3614 rcu_read_unlock();
3615 goto error;
3616 }
3617 }
3618 rcu_read_unlock();
3619
3620 error:
3621 return ret;
3622 }
3623
3624 /*
3625 * Record a kernel snapshot.
3626 *
3627 * Return LTTNG_OK on success or a LTTNG_ERR code.
3628 */
3629 static int record_kernel_snapshot(struct ltt_kernel_session *ksess,
3630 struct snapshot_output *output, struct ltt_session *session,
3631 int wait, uint64_t nb_packets_per_stream)
3632 {
3633 int ret;
3634
3635 assert(ksess);
3636 assert(output);
3637 assert(session);
3638
3639
3640 /*
3641 * Copy kernel session sockets so we can communicate with the right
3642 * consumer for the snapshot record command.
3643 */
3644 ret = consumer_copy_sockets(output->consumer, ksess->consumer);
3645 if (ret < 0) {
3646 ret = LTTNG_ERR_NOMEM;
3647 goto error;
3648 }
3649
3650 ret = set_relayd_for_snapshot(ksess->consumer, output, session);
3651 if (ret != LTTNG_OK) {
3652 goto error_snapshot;
3653 }
3654
3655 ret = kernel_snapshot_record(ksess, output, wait, nb_packets_per_stream);
3656 if (ret != LTTNG_OK) {
3657 goto error_snapshot;
3658 }
3659
3660 ret = LTTNG_OK;
3661 goto end;
3662
3663 error_snapshot:
3664 /* Clean up copied sockets so this output can use some other later on. */
3665 consumer_destroy_output_sockets(output->consumer);
3666 error:
3667 end:
3668 return ret;
3669 }
3670
3671 /*
3672 * Record a UST snapshot.
3673 *
3674 * Return 0 on success or a LTTNG_ERR error code.
3675 */
3676 static int record_ust_snapshot(struct ltt_ust_session *usess,
3677 struct snapshot_output *output, struct ltt_session *session,
3678 int wait, uint64_t nb_packets_per_stream)
3679 {
3680 int ret;
3681
3682 assert(usess);
3683 assert(output);
3684 assert(session);
3685
3686 /*
3687 * Copy UST session sockets so we can communicate with the right
3688 * consumer for the snapshot record command.
3689 */
3690 ret = consumer_copy_sockets(output->consumer, usess->consumer);
3691 if (ret < 0) {
3692 ret = LTTNG_ERR_NOMEM;
3693 goto error;
3694 }
3695
3696 ret = set_relayd_for_snapshot(usess->consumer, output, session);
3697 if (ret != LTTNG_OK) {
3698 goto error_snapshot;
3699 }
3700
3701 ret = ust_app_snapshot_record(usess, output, wait, nb_packets_per_stream);
3702 if (ret < 0) {
3703 switch (-ret) {
3704 case EINVAL:
3705 ret = LTTNG_ERR_INVALID;
3706 break;
3707 default:
3708 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3709 break;
3710 }
3711 goto error_snapshot;
3712 }
3713
3714 ret = LTTNG_OK;
3715
3716 error_snapshot:
3717 /* Clean up copied sockets so this output can use some other later on. */
3718 consumer_destroy_output_sockets(output->consumer);
3719 error:
3720 return ret;
3721 }
3722
3723 static
3724 uint64_t get_session_size_one_more_packet_per_stream(struct ltt_session *session,
3725 uint64_t cur_nr_packets)
3726 {
3727 uint64_t tot_size = 0;
3728
3729 if (session->kernel_session) {
3730 struct ltt_kernel_channel *chan;
3731 struct ltt_kernel_session *ksess = session->kernel_session;
3732
3733 cds_list_for_each_entry(chan, &ksess->channel_list.head, list) {
3734 if (cur_nr_packets >= chan->channel->attr.num_subbuf) {
3735 /*
3736 * Don't take channel into account if we
3737 * already grab all its packets.
3738 */
3739 continue;
3740 }
3741 tot_size += chan->channel->attr.subbuf_size
3742 * chan->stream_count;
3743 }
3744 }
3745
3746 if (session->ust_session) {
3747 struct ltt_ust_session *usess = session->ust_session;
3748
3749 tot_size += ust_app_get_size_one_more_packet_per_stream(usess,
3750 cur_nr_packets);
3751 }
3752
3753 return tot_size;
3754 }
3755
3756 /*
3757 * Calculate the number of packets we can grab from each stream that
3758 * fits within the overall snapshot max size.
3759 *
3760 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
3761 * the number of packets per stream.
3762 *
3763 * TODO: this approach is not perfect: we consider the worse case
3764 * (packet filling the sub-buffers) as an upper bound, but we could do
3765 * better if we do this calculation while we actually grab the packet
3766 * content: we would know how much padding we don't actually store into
3767 * the file.
3768 *
3769 * This algorithm is currently bounded by the number of packets per
3770 * stream.
3771 *
3772 * Since we call this algorithm before actually grabbing the data, it's
3773 * an approximation: for instance, applications could appear/disappear
3774 * in between this call and actually grabbing data.
3775 */
3776 static
3777 int64_t get_session_nb_packets_per_stream(struct ltt_session *session, uint64_t max_size)
3778 {
3779 int64_t size_left;
3780 uint64_t cur_nb_packets = 0;
3781
3782 if (!max_size) {
3783 return 0; /* Infinite */
3784 }
3785
3786 size_left = max_size;
3787 for (;;) {
3788 uint64_t one_more_packet_tot_size;
3789
3790 one_more_packet_tot_size = get_session_size_one_more_packet_per_stream(session,
3791 cur_nb_packets);
3792 if (!one_more_packet_tot_size) {
3793 /* We are already grabbing all packets. */
3794 break;
3795 }
3796 size_left -= one_more_packet_tot_size;
3797 if (size_left < 0) {
3798 break;
3799 }
3800 cur_nb_packets++;
3801 }
3802 if (!cur_nb_packets) {
3803 /* Not enough room to grab one packet of each stream, error. */
3804 return -1;
3805 }
3806 return cur_nb_packets;
3807 }
3808
3809 /*
3810 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
3811 *
3812 * The wait parameter is ignored so this call always wait for the snapshot to
3813 * complete before returning.
3814 *
3815 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3816 */
3817 int cmd_snapshot_record(struct ltt_session *session,
3818 struct lttng_snapshot_output *output, int wait)
3819 {
3820 int ret = LTTNG_OK;
3821 unsigned int use_tmp_output = 0;
3822 struct snapshot_output tmp_output;
3823 unsigned int snapshot_success = 0;
3824 char datetime[16];
3825
3826 assert(session);
3827 assert(output);
3828
3829 DBG("Cmd snapshot record for session %s", session->name);
3830
3831 /* Get the datetime for the snapshot output directory. */
3832 ret = utils_get_current_time_str("%Y%m%d-%H%M%S", datetime,
3833 sizeof(datetime));
3834 if (!ret) {
3835 ret = LTTNG_ERR_INVALID;
3836 goto error;
3837 }
3838
3839 /*
3840 * Permission denied to create an output if the session is not
3841 * set in no output mode.
3842 */
3843 if (session->output_traces) {
3844 ret = LTTNG_ERR_NOT_SNAPSHOT_SESSION;
3845 goto error;
3846 }
3847
3848 /* The session needs to be started at least once. */
3849 if (!session->has_been_started) {
3850 ret = LTTNG_ERR_START_SESSION_ONCE;
3851 goto error;
3852 }
3853
3854 /* Use temporary output for the session. */
3855 if (*output->ctrl_url != '\0') {
3856 ret = snapshot_output_init(output->max_size, output->name,
3857 output->ctrl_url, output->data_url, session->consumer,
3858 &tmp_output, NULL);
3859 if (ret < 0) {
3860 if (ret == -ENOMEM) {
3861 ret = LTTNG_ERR_NOMEM;
3862 } else {
3863 ret = LTTNG_ERR_INVALID;
3864 }
3865 goto error;
3866 }
3867 /* Use the global session count for the temporary snapshot. */
3868 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3869
3870 /* Use the global datetime */
3871 memcpy(tmp_output.datetime, datetime, sizeof(datetime));
3872 use_tmp_output = 1;
3873 }
3874
3875 if (use_tmp_output) {
3876 int64_t nb_packets_per_stream;
3877
3878 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3879 tmp_output.max_size);
3880 if (nb_packets_per_stream < 0) {
3881 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3882 goto error;
3883 }
3884
3885 if (session->kernel_session) {
3886 ret = record_kernel_snapshot(session->kernel_session,
3887 &tmp_output, session,
3888 wait, nb_packets_per_stream);
3889 if (ret != LTTNG_OK) {
3890 goto error;
3891 }
3892 }
3893
3894 if (session->ust_session) {
3895 ret = record_ust_snapshot(session->ust_session,
3896 &tmp_output, session,
3897 wait, nb_packets_per_stream);
3898 if (ret != LTTNG_OK) {
3899 goto error;
3900 }
3901 }
3902
3903 snapshot_success = 1;
3904 } else {
3905 struct snapshot_output *sout;
3906 struct lttng_ht_iter iter;
3907
3908 rcu_read_lock();
3909 cds_lfht_for_each_entry(session->snapshot.output_ht->ht,
3910 &iter.iter, sout, node.node) {
3911 int64_t nb_packets_per_stream;
3912
3913 /*
3914 * Make a local copy of the output and assign the possible
3915 * temporary value given by the caller.
3916 */
3917 memset(&tmp_output, 0, sizeof(tmp_output));
3918 memcpy(&tmp_output, sout, sizeof(tmp_output));
3919
3920 if (output->max_size != (uint64_t) -1ULL) {
3921 tmp_output.max_size = output->max_size;
3922 }
3923
3924 nb_packets_per_stream = get_session_nb_packets_per_stream(session,
3925 tmp_output.max_size);
3926 if (nb_packets_per_stream < 0) {
3927 ret = LTTNG_ERR_MAX_SIZE_INVALID;
3928 rcu_read_unlock();
3929 goto error;
3930 }
3931
3932 /* Use temporary name. */
3933 if (*output->name != '\0') {
3934 if (lttng_strncpy(tmp_output.name, output->name,
3935 sizeof(tmp_output.name))) {
3936 ret = LTTNG_ERR_INVALID;
3937 rcu_read_unlock();
3938 goto error;
3939 }
3940 }
3941
3942 tmp_output.nb_snapshot = session->snapshot.nb_snapshot;
3943 memcpy(tmp_output.datetime, datetime, sizeof(datetime));
3944
3945 if (session->kernel_session) {
3946 ret = record_kernel_snapshot(session->kernel_session,
3947 &tmp_output, session,
3948 wait, nb_packets_per_stream);
3949 if (ret != LTTNG_OK) {
3950 rcu_read_unlock();
3951 goto error;
3952 }
3953 }
3954
3955 if (session->ust_session) {
3956 ret = record_ust_snapshot(session->ust_session,
3957 &tmp_output, session,
3958 wait, nb_packets_per_stream);
3959 if (ret != LTTNG_OK) {
3960 rcu_read_unlock();
3961 goto error;
3962 }
3963 }
3964 snapshot_success = 1;
3965 }
3966 rcu_read_unlock();
3967 }
3968
3969 if (snapshot_success) {
3970 session->snapshot.nb_snapshot++;
3971 } else {
3972 ret = LTTNG_ERR_SNAPSHOT_FAIL;
3973 }
3974
3975 error:
3976 return ret;
3977 }
3978
3979 /*
3980 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
3981 */
3982 int cmd_set_session_shm_path(struct ltt_session *session,
3983 const char *shm_path)
3984 {
3985 /* Safety net */
3986 assert(session);
3987
3988 /*
3989 * Can only set shm path before session is started.
3990 */
3991 if (session->has_been_started) {
3992 return LTTNG_ERR_SESSION_STARTED;
3993 }
3994
3995 strncpy(session->shm_path, shm_path,
3996 sizeof(session->shm_path));
3997 session->shm_path[sizeof(session->shm_path) - 1] = '\0';
3998
3999 return 0;
4000 }
4001
4002 /*
4003 * Init command subsystem.
4004 */
4005 void cmd_init(void)
4006 {
4007 /*
4008 * Set network sequence index to 1 for streams to match a relayd
4009 * socket on the consumer side.
4010 */
4011 pthread_mutex_lock(&relayd_net_seq_idx_lock);
4012 relayd_net_seq_idx = 1;
4013 pthread_mutex_unlock(&relayd_net_seq_idx_lock);
4014
4015 DBG("Command subsystem initialized");
4016 }
LTTng 2.0 tools and control repository
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