2 * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
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.
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
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.
22 #include <urcu/list.h>
23 #include <urcu/uatomic.h>
27 #include <common/defaults.h>
28 #include <common/common.h>
29 #include <common/sessiond-comm/sessiond-comm.h>
30 #include <common/relayd/relayd.h>
31 #include <common/utils.h>
32 #include <common/compat/string.h>
33 #include <common/kernel-ctl/kernel-ctl.h>
34 #include <common/dynamic-buffer.h>
35 #include <common/buffer-view.h>
36 #include <common/trace-chunk.h>
37 #include <lttng/location-internal.h>
38 #include <lttng/trigger/trigger-internal.h>
39 #include <lttng/condition/condition.h>
40 #include <lttng/action/action.h>
41 #include <lttng/channel.h>
42 #include <lttng/channel-internal.h>
43 #include <lttng/rotate-internal.h>
44 #include <lttng/location-internal.h>
45 #include <lttng/session-internal.h>
46 #include <lttng/userspace-probe-internal.h>
47 #include <lttng/session-descriptor-internal.h>
48 #include <common/string-utils/string-utils.h>
53 #include "health-sessiond.h"
55 #include "kernel-consumer.h"
56 #include "lttng-sessiond.h"
58 #include "lttng-syscall.h"
60 #include "buffer-registry.h"
61 #include "notification-thread.h"
62 #include "notification-thread-commands.h"
64 #include "rotation-thread.h"
66 #include "agent-thread.h"
70 /* Sleep for 100ms between each check for the shm path's deletion. */
71 #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
73 struct cmd_destroy_session_reply_context
{
75 bool implicit_rotation_on_destroy
;
77 * Indicates whether or not an error occurred while launching the
78 * destruction of a session.
80 enum lttng_error_code destruction_status
;
83 static enum lttng_error_code
wait_on_path(void *path
);
86 * Command completion handler that is used by the destroy command
87 * when a session that has a non-default shm_path is being destroyed.
89 * See comment in cmd_destroy_session() for the rationale.
91 static struct destroy_completion_handler
{
92 struct cmd_completion_handler handler
;
93 char shm_path
[member_sizeof(struct ltt_session
, shm_path
)];
94 } destroy_completion_handler
= {
97 .data
= destroy_completion_handler
.shm_path
102 static struct cmd_completion_handler
*current_completion_handler
;
105 * Used to keep a unique index for each relayd socket created where this value
106 * is associated with streams on the consumer so it can match the right relayd
107 * to send to. It must be accessed with the relayd_net_seq_idx_lock
110 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
111 static uint64_t relayd_net_seq_idx
;
113 static int validate_ust_event_name(const char *);
114 static int cmd_enable_event_internal(struct ltt_session
*session
,
115 const struct lttng_domain
*domain
,
116 char *channel_name
, struct lttng_event
*event
,
117 char *filter_expression
,
118 struct lttng_filter_bytecode
*filter
,
119 struct lttng_event_exclusion
*exclusion
,
123 * Create a session path used by list_lttng_sessions for the case that the
124 * session consumer is on the network.
126 static int build_network_session_path(char *dst
, size_t size
,
127 struct ltt_session
*session
)
129 int ret
, kdata_port
, udata_port
;
130 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
131 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
136 memset(tmp_urls
, 0, sizeof(tmp_urls
));
137 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
139 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
141 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
142 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
143 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
146 if (session
->ust_session
&& session
->ust_session
->consumer
) {
147 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
148 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
151 if (uuri
== NULL
&& kuri
== NULL
) {
152 uri
= &session
->consumer
->dst
.net
.control
;
153 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
154 } else if (kuri
&& uuri
) {
155 ret
= uri_compare(kuri
, uuri
);
159 /* Build uuri URL string */
160 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
167 } else if (kuri
&& uuri
== NULL
) {
169 } else if (uuri
&& kuri
== NULL
) {
173 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
179 * Do we have a UST url set. If yes, this means we have both kernel and UST
182 if (*tmp_uurl
!= '\0') {
183 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
184 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
187 if (kuri
|| (!kuri
&& !uuri
)) {
190 /* No kernel URI, use the UST port. */
193 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
201 * Get run-time attributes if the session has been started (discarded events,
204 static int get_kernel_runtime_stats(struct ltt_session
*session
,
205 struct ltt_kernel_channel
*kchan
, uint64_t *discarded_events
,
206 uint64_t *lost_packets
)
210 if (!session
->has_been_started
) {
212 *discarded_events
= 0;
217 ret
= consumer_get_discarded_events(session
->id
, kchan
->key
,
218 session
->kernel_session
->consumer
,
224 ret
= consumer_get_lost_packets(session
->id
, kchan
->key
,
225 session
->kernel_session
->consumer
,
236 * Get run-time attributes if the session has been started (discarded events,
239 static int get_ust_runtime_stats(struct ltt_session
*session
,
240 struct ltt_ust_channel
*uchan
, uint64_t *discarded_events
,
241 uint64_t *lost_packets
)
244 struct ltt_ust_session
*usess
;
246 if (!discarded_events
|| !lost_packets
) {
251 usess
= session
->ust_session
;
252 assert(discarded_events
);
253 assert(lost_packets
);
255 if (!usess
|| !session
->has_been_started
) {
256 *discarded_events
= 0;
262 if (usess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
263 ret
= ust_app_uid_get_channel_runtime_stats(usess
->id
,
264 &usess
->buffer_reg_uid_list
,
265 usess
->consumer
, uchan
->id
,
266 uchan
->attr
.overwrite
,
269 } else if (usess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
270 ret
= ust_app_pid_get_channel_runtime_stats(usess
,
271 uchan
, usess
->consumer
,
272 uchan
->attr
.overwrite
,
278 *discarded_events
+= uchan
->per_pid_closed_app_discarded
;
279 *lost_packets
+= uchan
->per_pid_closed_app_lost
;
281 ERR("Unsupported buffer type");
292 * Fill lttng_channel array of all channels.
294 static ssize_t
list_lttng_channels(enum lttng_domain_type domain
,
295 struct ltt_session
*session
, struct lttng_channel
*channels
,
296 struct lttng_channel_extended
*chan_exts
)
299 struct ltt_kernel_channel
*kchan
;
301 DBG("Listing channels for session %s", session
->name
);
304 case LTTNG_DOMAIN_KERNEL
:
305 /* Kernel channels */
306 if (session
->kernel_session
!= NULL
) {
307 cds_list_for_each_entry(kchan
,
308 &session
->kernel_session
->channel_list
.head
, list
) {
309 uint64_t discarded_events
, lost_packets
;
310 struct lttng_channel_extended
*extended
;
312 extended
= (struct lttng_channel_extended
*)
313 kchan
->channel
->attr
.extended
.ptr
;
315 ret
= get_kernel_runtime_stats(session
, kchan
,
316 &discarded_events
, &lost_packets
);
320 /* Copy lttng_channel struct to array */
321 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
322 channels
[i
].enabled
= kchan
->enabled
;
323 chan_exts
[i
].discarded_events
=
325 chan_exts
[i
].lost_packets
= lost_packets
;
326 chan_exts
[i
].monitor_timer_interval
=
327 extended
->monitor_timer_interval
;
328 chan_exts
[i
].blocking_timeout
= 0;
333 case LTTNG_DOMAIN_UST
:
335 struct lttng_ht_iter iter
;
336 struct ltt_ust_channel
*uchan
;
339 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
340 &iter
.iter
, uchan
, node
.node
) {
341 uint64_t discarded_events
= 0, lost_packets
= 0;
343 if (lttng_strncpy(channels
[i
].name
, uchan
->name
,
344 LTTNG_SYMBOL_NAME_LEN
)) {
347 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
348 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
349 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
350 channels
[i
].attr
.switch_timer_interval
=
351 uchan
->attr
.switch_timer_interval
;
352 channels
[i
].attr
.read_timer_interval
=
353 uchan
->attr
.read_timer_interval
;
354 channels
[i
].enabled
= uchan
->enabled
;
355 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
356 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
359 * Map enum lttng_ust_output to enum lttng_event_output.
361 switch (uchan
->attr
.output
) {
363 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
367 * LTTNG_UST_MMAP is the only supported UST
374 chan_exts
[i
].monitor_timer_interval
=
375 uchan
->monitor_timer_interval
;
376 chan_exts
[i
].blocking_timeout
=
377 uchan
->attr
.u
.s
.blocking_timeout
;
379 ret
= get_ust_runtime_stats(session
, uchan
,
380 &discarded_events
, &lost_packets
);
384 chan_exts
[i
].discarded_events
= discarded_events
;
385 chan_exts
[i
].lost_packets
= lost_packets
;
397 return -LTTNG_ERR_FATAL
;
403 static int increment_extended_len(const char *filter_expression
,
404 struct lttng_event_exclusion
*exclusion
,
405 const struct lttng_userspace_probe_location
*probe_location
,
406 size_t *extended_len
)
410 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
412 if (filter_expression
) {
413 *extended_len
+= strlen(filter_expression
) + 1;
417 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
420 if (probe_location
) {
421 ret
= lttng_userspace_probe_location_serialize(probe_location
,
426 *extended_len
+= ret
;
433 static int append_extended_info(const char *filter_expression
,
434 struct lttng_event_exclusion
*exclusion
,
435 struct lttng_userspace_probe_location
*probe_location
,
439 size_t filter_len
= 0;
440 size_t nb_exclusions
= 0;
441 size_t userspace_probe_location_len
= 0;
442 struct lttng_dynamic_buffer location_buffer
;
443 struct lttcomm_event_extended_header extended_header
;
445 if (filter_expression
) {
446 filter_len
= strlen(filter_expression
) + 1;
450 nb_exclusions
= exclusion
->count
;
453 if (probe_location
) {
454 lttng_dynamic_buffer_init(&location_buffer
);
455 ret
= lttng_userspace_probe_location_serialize(probe_location
,
456 &location_buffer
, NULL
);
461 userspace_probe_location_len
= location_buffer
.size
;
464 /* Set header fields */
465 extended_header
.filter_len
= filter_len
;
466 extended_header
.nb_exclusions
= nb_exclusions
;
467 extended_header
.userspace_probe_location_len
= userspace_probe_location_len
;
470 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
471 *extended_at
+= sizeof(extended_header
);
473 /* Copy filter string */
474 if (filter_expression
) {
475 memcpy(*extended_at
, filter_expression
, filter_len
);
476 *extended_at
+= filter_len
;
479 /* Copy exclusion names */
481 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
483 memcpy(*extended_at
, &exclusion
->names
, len
);
487 if (probe_location
) {
488 memcpy(*extended_at
, location_buffer
.data
, location_buffer
.size
);
489 *extended_at
+= location_buffer
.size
;
490 lttng_dynamic_buffer_reset(&location_buffer
);
498 * Create a list of agent domain events.
500 * Return number of events in list on success or else a negative value.
502 static int list_lttng_agent_events(struct agent
*agt
,
503 struct lttng_event
**events
, size_t *total_size
)
506 unsigned int nb_event
= 0;
507 struct agent_event
*event
;
508 struct lttng_event
*tmp_events
= NULL
;
509 struct lttng_ht_iter iter
;
510 size_t extended_len
= 0;
516 DBG3("Listing agent events");
519 nb_event
= lttng_ht_get_count(agt
->events
);
527 /* Compute required extended infos size */
528 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
531 * This is only valid because the commands which add events are
532 * processed in the same thread as the listing.
535 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
536 ret
= increment_extended_len(event
->filter_expression
, NULL
, NULL
,
539 DBG("Error computing the length of extended info message");
540 ret
= -LTTNG_ERR_FATAL
;
546 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
547 tmp_events
= zmalloc(*total_size
);
549 PERROR("zmalloc agent events session");
550 ret
= -LTTNG_ERR_FATAL
;
554 extended_at
= ((uint8_t *) tmp_events
) +
555 nb_event
* sizeof(struct lttng_event
);
558 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
559 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
560 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
561 tmp_events
[i
].enabled
= event
->enabled
;
562 tmp_events
[i
].loglevel
= event
->loglevel_value
;
563 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
566 /* Append extended info */
567 ret
= append_extended_info(event
->filter_expression
, NULL
, NULL
,
570 DBG("Error appending extended info message");
571 ret
= -LTTNG_ERR_FATAL
;
576 *events
= tmp_events
;
578 assert(nb_event
== i
);
589 * Create a list of ust global domain events.
591 static int list_lttng_ust_global_events(char *channel_name
,
592 struct ltt_ust_domain_global
*ust_global
,
593 struct lttng_event
**events
, size_t *total_size
)
596 unsigned int nb_event
= 0;
597 struct lttng_ht_iter iter
;
598 struct lttng_ht_node_str
*node
;
599 struct ltt_ust_channel
*uchan
;
600 struct ltt_ust_event
*uevent
;
601 struct lttng_event
*tmp
;
602 size_t extended_len
= 0;
605 DBG("Listing UST global events for channel %s", channel_name
);
609 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
610 node
= lttng_ht_iter_get_node_str(&iter
);
612 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
616 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
618 nb_event
= lttng_ht_get_count(uchan
->events
);
625 DBG3("Listing UST global %d events", nb_event
);
627 /* Compute required extended infos size */
628 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
629 if (uevent
->internal
) {
634 ret
= increment_extended_len(uevent
->filter_expression
,
635 uevent
->exclusion
, NULL
, &extended_len
);
637 DBG("Error computing the length of extended info message");
638 ret
= -LTTNG_ERR_FATAL
;
643 /* All events are internal, skip. */
649 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
650 tmp
= zmalloc(*total_size
);
652 ret
= -LTTNG_ERR_FATAL
;
656 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
658 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
659 if (uevent
->internal
) {
660 /* This event should remain hidden from clients */
663 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
664 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
665 tmp
[i
].enabled
= uevent
->enabled
;
667 switch (uevent
->attr
.instrumentation
) {
668 case LTTNG_UST_TRACEPOINT
:
669 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
671 case LTTNG_UST_PROBE
:
672 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
674 case LTTNG_UST_FUNCTION
:
675 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
679 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
680 switch (uevent
->attr
.loglevel_type
) {
681 case LTTNG_UST_LOGLEVEL_ALL
:
682 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
684 case LTTNG_UST_LOGLEVEL_RANGE
:
685 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
687 case LTTNG_UST_LOGLEVEL_SINGLE
:
688 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
691 if (uevent
->filter
) {
694 if (uevent
->exclusion
) {
695 tmp
[i
].exclusion
= 1;
699 /* Append extended info */
700 ret
= append_extended_info(uevent
->filter_expression
,
701 uevent
->exclusion
, NULL
, &extended_at
);
703 DBG("Error appending extended info message");
704 ret
= -LTTNG_ERR_FATAL
;
717 * Fill lttng_event array of all kernel events in the channel.
719 static int list_lttng_kernel_events(char *channel_name
,
720 struct ltt_kernel_session
*kernel_session
,
721 struct lttng_event
**events
, size_t *total_size
)
724 unsigned int nb_event
;
725 struct ltt_kernel_event
*event
;
726 struct ltt_kernel_channel
*kchan
;
727 size_t extended_len
= 0;
730 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
732 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
736 nb_event
= kchan
->event_count
;
738 DBG("Listing events for channel %s", kchan
->channel
->name
);
746 /* Compute required extended infos size */
747 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
748 ret
= increment_extended_len(event
->filter_expression
, NULL
,
749 event
->userspace_probe_location
,
752 DBG("Error computing the length of extended info message");
753 ret
= -LTTNG_ERR_FATAL
;
758 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
759 *events
= zmalloc(*total_size
);
760 if (*events
== NULL
) {
761 ret
= -LTTNG_ERR_FATAL
;
765 extended_at
= ((void *) *events
) +
766 nb_event
* sizeof(struct lttng_event
);
768 /* Kernel channels */
769 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
770 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
771 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
772 (*events
)[i
].enabled
= event
->enabled
;
773 (*events
)[i
].filter
=
774 (unsigned char) !!event
->filter_expression
;
776 switch (event
->event
->instrumentation
) {
777 case LTTNG_KERNEL_TRACEPOINT
:
778 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
780 case LTTNG_KERNEL_KRETPROBE
:
781 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
782 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
783 sizeof(struct lttng_kernel_kprobe
));
785 case LTTNG_KERNEL_KPROBE
:
786 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
787 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
788 sizeof(struct lttng_kernel_kprobe
));
790 case LTTNG_KERNEL_UPROBE
:
791 (*events
)[i
].type
= LTTNG_EVENT_USERSPACE_PROBE
;
793 case LTTNG_KERNEL_FUNCTION
:
794 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
795 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
796 sizeof(struct lttng_kernel_function
));
798 case LTTNG_KERNEL_NOOP
:
799 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
801 case LTTNG_KERNEL_SYSCALL
:
802 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
804 case LTTNG_KERNEL_ALL
:
812 /* Append extended info */
813 ret
= append_extended_info(event
->filter_expression
, NULL
,
814 event
->userspace_probe_location
, &extended_at
);
816 DBG("Error appending extended info message");
817 ret
= -LTTNG_ERR_FATAL
;
826 /* Negate the error code to differentiate the size from an error */
831 * Add URI so the consumer output object. Set the correct path depending on the
832 * domain adding the default trace directory.
834 static enum lttng_error_code
add_uri_to_consumer(
835 const struct ltt_session
*session
,
836 struct consumer_output
*consumer
,
837 struct lttng_uri
*uri
, enum lttng_domain_type domain
)
840 enum lttng_error_code ret_code
= LTTNG_OK
;
844 if (consumer
== NULL
) {
845 DBG("No consumer detected. Don't add URI. Stopping.");
846 ret_code
= LTTNG_ERR_NO_CONSUMER
;
851 case LTTNG_DOMAIN_KERNEL
:
852 ret
= lttng_strncpy(consumer
->domain_subdir
,
853 DEFAULT_KERNEL_TRACE_DIR
,
854 sizeof(consumer
->domain_subdir
));
856 case LTTNG_DOMAIN_UST
:
857 ret
= lttng_strncpy(consumer
->domain_subdir
,
858 DEFAULT_UST_TRACE_DIR
,
859 sizeof(consumer
->domain_subdir
));
863 * This case is possible is we try to add the URI to the global
864 * tracing session consumer object which in this case there is
867 memset(consumer
->domain_subdir
, 0,
868 sizeof(consumer
->domain_subdir
));
872 ERR("Failed to initialize consumer output domain subdirectory");
873 ret_code
= LTTNG_ERR_FATAL
;
877 switch (uri
->dtype
) {
880 DBG2("Setting network URI to consumer");
882 if (consumer
->type
== CONSUMER_DST_NET
) {
883 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
884 consumer
->dst
.net
.control_isset
) ||
885 (uri
->stype
== LTTNG_STREAM_DATA
&&
886 consumer
->dst
.net
.data_isset
)) {
887 ret_code
= LTTNG_ERR_URL_EXIST
;
891 memset(&consumer
->dst
, 0, sizeof(consumer
->dst
));
894 /* Set URI into consumer output object */
895 ret
= consumer_set_network_uri(session
, consumer
, uri
);
899 } else if (ret
== 1) {
901 * URI was the same in the consumer so we do not append the subdir
902 * again so to not duplicate output dir.
909 if (*uri
->dst
.path
!= '/' || strstr(uri
->dst
.path
, "../")) {
910 ret_code
= LTTNG_ERR_INVALID
;
913 DBG2("Setting trace directory path from URI to %s",
915 memset(&consumer
->dst
, 0, sizeof(consumer
->dst
));
917 ret
= lttng_strncpy(consumer
->dst
.session_root_path
,
919 sizeof(consumer
->dst
.session_root_path
));
921 ret_code
= LTTNG_ERR_FATAL
;
924 consumer
->type
= CONSUMER_DST_LOCAL
;
934 * Init tracing by creating trace directory and sending fds kernel consumer.
936 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
939 struct lttng_ht_iter iter
;
940 struct consumer_socket
*socket
;
946 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
947 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
949 pthread_mutex_lock(socket
->lock
);
950 ret
= kernel_consumer_send_session(socket
, session
);
951 pthread_mutex_unlock(socket
->lock
);
953 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
965 * Create a socket to the relayd using the URI.
967 * On success, the relayd_sock pointer is set to the created socket.
968 * Else, it remains untouched and an LTTng error code is returned.
970 static enum lttng_error_code
create_connect_relayd(struct lttng_uri
*uri
,
971 struct lttcomm_relayd_sock
**relayd_sock
,
972 struct consumer_output
*consumer
)
975 enum lttng_error_code status
= LTTNG_OK
;
976 struct lttcomm_relayd_sock
*rsock
;
978 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
979 RELAYD_VERSION_COMM_MINOR
);
981 status
= LTTNG_ERR_FATAL
;
986 * Connect to relayd so we can proceed with a session creation. This call
987 * can possibly block for an arbitrary amount of time to set the health
988 * state to be in poll execution.
991 ret
= relayd_connect(rsock
);
994 ERR("Unable to reach lttng-relayd");
995 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
999 /* Create socket for control stream. */
1000 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
1001 uint64_t result_flags
;
1003 DBG3("Creating relayd stream socket from URI");
1005 /* Check relayd version */
1006 ret
= relayd_version_check(rsock
);
1007 if (ret
== LTTNG_ERR_RELAYD_VERSION_FAIL
) {
1008 status
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
1010 } else if (ret
< 0) {
1011 ERR("Unable to reach lttng-relayd");
1012 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
1015 consumer
->relay_major_version
= rsock
->major
;
1016 consumer
->relay_minor_version
= rsock
->minor
;
1017 ret
= relayd_get_configuration(rsock
, 0,
1020 ERR("Unable to get relayd configuration");
1021 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
1024 if (result_flags
& LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED
) {
1025 consumer
->relay_allows_clear
= true;
1027 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
1028 DBG3("Creating relayd data socket from URI");
1030 /* Command is not valid */
1031 ERR("Relayd invalid stream type: %d", uri
->stype
);
1032 status
= LTTNG_ERR_INVALID
;
1036 *relayd_sock
= rsock
;
1041 /* The returned value is not useful since we are on an error path. */
1042 (void) relayd_close(rsock
);
1050 * Connect to the relayd using URI and send the socket to the right consumer.
1052 * The consumer socket lock must be held by the caller.
1054 * Returns LTTNG_OK on success or an LTTng error code on failure.
1056 static enum lttng_error_code
send_consumer_relayd_socket(
1057 unsigned int session_id
,
1058 struct lttng_uri
*relayd_uri
,
1059 struct consumer_output
*consumer
,
1060 struct consumer_socket
*consumer_sock
,
1061 const char *session_name
, const char *hostname
,
1062 const char *base_path
, int session_live_timer
,
1063 const uint64_t *current_chunk_id
,
1064 time_t session_creation_time
,
1065 bool session_name_contains_creation_time
)
1068 struct lttcomm_relayd_sock
*rsock
= NULL
;
1069 enum lttng_error_code status
;
1071 /* Connect to relayd and make version check if uri is the control. */
1072 status
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
1073 if (status
!= LTTNG_OK
) {
1074 goto relayd_comm_error
;
1078 /* Set the network sequence index if not set. */
1079 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
1080 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
1082 * Increment net_seq_idx because we are about to transfer the
1083 * new relayd socket to the consumer.
1084 * Assign unique key so the consumer can match streams.
1086 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
1087 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
1090 /* Send relayd socket to consumer. */
1091 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
1092 relayd_uri
->stype
, session_id
,
1093 session_name
, hostname
, base_path
,
1094 session_live_timer
, current_chunk_id
,
1095 session_creation_time
, session_name_contains_creation_time
);
1097 status
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
1101 /* Flag that the corresponding socket was sent. */
1102 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
1103 consumer_sock
->control_sock_sent
= 1;
1104 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
1105 consumer_sock
->data_sock_sent
= 1;
1109 * Close socket which was dup on the consumer side. The session daemon does
1110 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1114 if (status
!= LTTNG_OK
) {
1116 * The consumer output for this session should not be used anymore
1117 * since the relayd connection failed thus making any tracing or/and
1118 * streaming not usable.
1120 consumer
->enabled
= 0;
1122 (void) relayd_close(rsock
);
1130 * Send both relayd sockets to a specific consumer and domain. This is a
1131 * helper function to facilitate sending the information to the consumer for a
1134 * The consumer socket lock must be held by the caller.
1136 * Returns LTTNG_OK, or an LTTng error code on failure.
1138 static enum lttng_error_code
send_consumer_relayd_sockets(
1139 enum lttng_domain_type domain
,
1140 unsigned int session_id
, struct consumer_output
*consumer
,
1141 struct consumer_socket
*sock
, const char *session_name
,
1142 const char *hostname
, const char *base_path
, int session_live_timer
,
1143 const uint64_t *current_chunk_id
, time_t session_creation_time
,
1144 bool session_name_contains_creation_time
)
1146 enum lttng_error_code status
= LTTNG_OK
;
1151 /* Sending control relayd socket. */
1152 if (!sock
->control_sock_sent
) {
1153 status
= send_consumer_relayd_socket(session_id
,
1154 &consumer
->dst
.net
.control
, consumer
, sock
,
1155 session_name
, hostname
, base_path
, session_live_timer
,
1156 current_chunk_id
, session_creation_time
,
1157 session_name_contains_creation_time
);
1158 if (status
!= LTTNG_OK
) {
1163 /* Sending data relayd socket. */
1164 if (!sock
->data_sock_sent
) {
1165 status
= send_consumer_relayd_socket(session_id
,
1166 &consumer
->dst
.net
.data
, consumer
, sock
,
1167 session_name
, hostname
, base_path
, session_live_timer
,
1168 current_chunk_id
, session_creation_time
,
1169 session_name_contains_creation_time
);
1170 if (status
!= LTTNG_OK
) {
1180 * Setup relayd connections for a tracing session. First creates the socket to
1181 * the relayd and send them to the right domain consumer. Consumer type MUST be
1184 int cmd_setup_relayd(struct ltt_session
*session
)
1187 struct ltt_ust_session
*usess
;
1188 struct ltt_kernel_session
*ksess
;
1189 struct consumer_socket
*socket
;
1190 struct lttng_ht_iter iter
;
1191 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
1195 usess
= session
->ust_session
;
1196 ksess
= session
->kernel_session
;
1198 DBG("Setting relayd for session %s", session
->name
);
1201 if (session
->current_trace_chunk
) {
1202 enum lttng_trace_chunk_status status
= lttng_trace_chunk_get_id(
1203 session
->current_trace_chunk
, ¤t_chunk_id
.value
);
1205 if (status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
1206 current_chunk_id
.is_set
= true;
1208 ERR("Failed to get current trace chunk id");
1209 ret
= LTTNG_ERR_UNK
;
1214 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
1215 && usess
->consumer
->enabled
) {
1216 /* For each consumer socket, send relayd sockets */
1217 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1218 socket
, node
.node
) {
1219 pthread_mutex_lock(socket
->lock
);
1220 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1221 usess
->consumer
, socket
,
1222 session
->name
, session
->hostname
,
1224 session
->live_timer
,
1225 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1226 session
->creation_time
,
1227 session
->name_contains_creation_time
);
1228 pthread_mutex_unlock(socket
->lock
);
1229 if (ret
!= LTTNG_OK
) {
1232 /* Session is now ready for network streaming. */
1233 session
->net_handle
= 1;
1235 session
->consumer
->relay_major_version
=
1236 usess
->consumer
->relay_major_version
;
1237 session
->consumer
->relay_minor_version
=
1238 usess
->consumer
->relay_minor_version
;
1239 session
->consumer
->relay_allows_clear
=
1240 usess
->consumer
->relay_allows_clear
;
1243 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1244 && ksess
->consumer
->enabled
) {
1245 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1246 socket
, node
.node
) {
1247 pthread_mutex_lock(socket
->lock
);
1248 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1249 ksess
->consumer
, socket
,
1250 session
->name
, session
->hostname
,
1252 session
->live_timer
,
1253 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1254 session
->creation_time
,
1255 session
->name_contains_creation_time
);
1256 pthread_mutex_unlock(socket
->lock
);
1257 if (ret
!= LTTNG_OK
) {
1260 /* Session is now ready for network streaming. */
1261 session
->net_handle
= 1;
1263 session
->consumer
->relay_major_version
=
1264 ksess
->consumer
->relay_major_version
;
1265 session
->consumer
->relay_minor_version
=
1266 ksess
->consumer
->relay_minor_version
;
1267 session
->consumer
->relay_allows_clear
=
1268 ksess
->consumer
->relay_allows_clear
;
1277 * Start a kernel session by opening all necessary streams.
1279 int start_kernel_session(struct ltt_kernel_session
*ksess
)
1282 struct ltt_kernel_channel
*kchan
;
1284 /* Open kernel metadata */
1285 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1286 ret
= kernel_open_metadata(ksess
);
1288 ret
= LTTNG_ERR_KERN_META_FAIL
;
1293 /* Open kernel metadata stream */
1294 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1295 ret
= kernel_open_metadata_stream(ksess
);
1297 ERR("Kernel create metadata stream failed");
1298 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1303 /* For each channel */
1304 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1305 if (kchan
->stream_count
== 0) {
1306 ret
= kernel_open_channel_stream(kchan
);
1308 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1311 /* Update the stream global counter */
1312 ksess
->stream_count_global
+= ret
;
1316 /* Setup kernel consumer socket and send fds to it */
1317 ret
= init_kernel_tracing(ksess
);
1319 ret
= LTTNG_ERR_KERN_START_FAIL
;
1323 /* This start the kernel tracing */
1324 ret
= kernel_start_session(ksess
);
1326 ret
= LTTNG_ERR_KERN_START_FAIL
;
1330 /* Quiescent wait after starting trace */
1331 kernel_wait_quiescent();
1341 int stop_kernel_session(struct ltt_kernel_session
*ksess
)
1343 struct ltt_kernel_channel
*kchan
;
1344 bool error_occurred
= false;
1347 if (!ksess
|| !ksess
->active
) {
1350 DBG("Stopping kernel tracing");
1352 ret
= kernel_stop_session(ksess
);
1354 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1358 kernel_wait_quiescent();
1360 /* Flush metadata after stopping (if exists) */
1361 if (ksess
->metadata_stream_fd
>= 0) {
1362 ret
= kernel_metadata_flush_buffer(ksess
->metadata_stream_fd
);
1364 ERR("Kernel metadata flush failed");
1365 error_occurred
= true;
1369 /* Flush all buffers after stopping */
1370 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1371 ret
= kernel_flush_buffer(kchan
);
1373 ERR("Kernel flush buffer error");
1374 error_occurred
= true;
1379 if (error_occurred
) {
1380 ret
= LTTNG_ERR_UNK
;
1389 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1391 int cmd_disable_channel(struct ltt_session
*session
,
1392 enum lttng_domain_type domain
, char *channel_name
)
1395 struct ltt_ust_session
*usess
;
1397 usess
= session
->ust_session
;
1402 case LTTNG_DOMAIN_KERNEL
:
1404 ret
= channel_kernel_disable(session
->kernel_session
,
1406 if (ret
!= LTTNG_OK
) {
1410 kernel_wait_quiescent();
1413 case LTTNG_DOMAIN_UST
:
1415 struct ltt_ust_channel
*uchan
;
1416 struct lttng_ht
*chan_ht
;
1418 chan_ht
= usess
->domain_global
.channels
;
1420 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1421 if (uchan
== NULL
) {
1422 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1426 ret
= channel_ust_disable(usess
, uchan
);
1427 if (ret
!= LTTNG_OK
) {
1433 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1445 * Command LTTNG_TRACK_PID processed by the client thread.
1447 * Called with session lock held.
1449 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1457 case LTTNG_DOMAIN_KERNEL
:
1459 struct ltt_kernel_session
*ksess
;
1461 ksess
= session
->kernel_session
;
1463 ret
= kernel_track_pid(ksess
, pid
);
1464 if (ret
!= LTTNG_OK
) {
1468 kernel_wait_quiescent();
1471 case LTTNG_DOMAIN_UST
:
1473 struct ltt_ust_session
*usess
;
1475 usess
= session
->ust_session
;
1477 ret
= trace_ust_track_pid(usess
, pid
);
1478 if (ret
!= LTTNG_OK
) {
1484 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1496 * Command LTTNG_UNTRACK_PID processed by the client thread.
1498 * Called with session lock held.
1500 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1508 case LTTNG_DOMAIN_KERNEL
:
1510 struct ltt_kernel_session
*ksess
;
1512 ksess
= session
->kernel_session
;
1514 ret
= kernel_untrack_pid(ksess
, pid
);
1515 if (ret
!= LTTNG_OK
) {
1519 kernel_wait_quiescent();
1522 case LTTNG_DOMAIN_UST
:
1524 struct ltt_ust_session
*usess
;
1526 usess
= session
->ust_session
;
1528 ret
= trace_ust_untrack_pid(usess
, pid
);
1529 if (ret
!= LTTNG_OK
) {
1535 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1547 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1549 * The wpipe arguments is used as a notifier for the kernel thread.
1551 int cmd_enable_channel(struct ltt_session
*session
,
1552 const struct lttng_domain
*domain
, const struct lttng_channel
*_attr
, int wpipe
)
1555 struct ltt_ust_session
*usess
= session
->ust_session
;
1556 struct lttng_ht
*chan_ht
;
1558 struct lttng_channel attr
;
1565 len
= lttng_strnlen(attr
.name
, sizeof(attr
.name
));
1567 /* Validate channel name */
1568 if (attr
.name
[0] == '.' ||
1569 memchr(attr
.name
, '/', len
) != NULL
) {
1570 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1574 DBG("Enabling channel %s for session %s", attr
.name
, session
->name
);
1579 * Don't try to enable a channel if the session has been started at
1580 * some point in time before. The tracer does not allow it.
1582 if (session
->has_been_started
) {
1583 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1588 * If the session is a live session, remove the switch timer, the
1589 * live timer does the same thing but sends also synchronisation
1590 * beacons for inactive streams.
1592 if (session
->live_timer
> 0) {
1593 attr
.attr
.live_timer_interval
= session
->live_timer
;
1594 attr
.attr
.switch_timer_interval
= 0;
1597 /* Check for feature support */
1598 switch (domain
->type
) {
1599 case LTTNG_DOMAIN_KERNEL
:
1601 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
1602 /* Sampling position of buffer is not supported */
1603 WARN("Kernel tracer does not support buffer monitoring. "
1604 "Setting the monitor interval timer to 0 "
1605 "(disabled) for channel '%s' of session '%s'",
1606 attr
.name
, session
->name
);
1607 lttng_channel_set_monitor_timer_interval(&attr
, 0);
1611 case LTTNG_DOMAIN_UST
:
1613 case LTTNG_DOMAIN_JUL
:
1614 case LTTNG_DOMAIN_LOG4J
:
1615 case LTTNG_DOMAIN_PYTHON
:
1616 if (!agent_tracing_is_enabled()) {
1617 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1618 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
1623 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1627 switch (domain
->type
) {
1628 case LTTNG_DOMAIN_KERNEL
:
1630 struct ltt_kernel_channel
*kchan
;
1632 kchan
= trace_kernel_get_channel_by_name(attr
.name
,
1633 session
->kernel_session
);
1634 if (kchan
== NULL
) {
1635 if (session
->snapshot
.nb_output
> 0 ||
1636 session
->snapshot_mode
) {
1637 /* Enforce mmap output for snapshot sessions. */
1638 attr
.attr
.output
= LTTNG_EVENT_MMAP
;
1640 ret
= channel_kernel_create(session
->kernel_session
, &attr
, wpipe
);
1641 if (attr
.name
[0] != '\0') {
1642 session
->kernel_session
->has_non_default_channel
= 1;
1645 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1648 if (ret
!= LTTNG_OK
) {
1652 kernel_wait_quiescent();
1655 case LTTNG_DOMAIN_UST
:
1656 case LTTNG_DOMAIN_JUL
:
1657 case LTTNG_DOMAIN_LOG4J
:
1658 case LTTNG_DOMAIN_PYTHON
:
1660 struct ltt_ust_channel
*uchan
;
1665 * Current agent implementation limitations force us to allow
1666 * only one channel at once in "agent" subdomains. Each
1667 * subdomain has a default channel name which must be strictly
1670 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1671 if (strncmp(attr
.name
, DEFAULT_JUL_CHANNEL_NAME
,
1672 LTTNG_SYMBOL_NAME_LEN
)) {
1673 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1676 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1677 if (strncmp(attr
.name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1678 LTTNG_SYMBOL_NAME_LEN
)) {
1679 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1682 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1683 if (strncmp(attr
.name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1684 LTTNG_SYMBOL_NAME_LEN
)) {
1685 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1690 chan_ht
= usess
->domain_global
.channels
;
1692 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
.name
);
1693 if (uchan
== NULL
) {
1694 ret
= channel_ust_create(usess
, &attr
, domain
->buf_type
);
1695 if (attr
.name
[0] != '\0') {
1696 usess
->has_non_default_channel
= 1;
1699 ret
= channel_ust_enable(usess
, uchan
);
1704 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1708 if (ret
== LTTNG_OK
&& attr
.attr
.output
!= LTTNG_EVENT_MMAP
) {
1709 session
->has_non_mmap_channel
= true;
1718 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1720 int cmd_disable_event(struct ltt_session
*session
,
1721 enum lttng_domain_type domain
, const char *channel_name
,
1722 const struct lttng_event
*event
)
1725 const char *event_name
;
1727 DBG("Disable event command for event \'%s\'", event
->name
);
1729 event_name
= event
->name
;
1731 /* Error out on unhandled search criteria */
1732 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1733 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1734 ret
= LTTNG_ERR_UNK
;
1741 case LTTNG_DOMAIN_KERNEL
:
1743 struct ltt_kernel_channel
*kchan
;
1744 struct ltt_kernel_session
*ksess
;
1746 ksess
= session
->kernel_session
;
1749 * If a non-default channel has been created in the
1750 * session, explicitely require that -c chan_name needs
1753 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1754 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1758 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1759 if (kchan
== NULL
) {
1760 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1764 switch (event
->type
) {
1765 case LTTNG_EVENT_ALL
:
1766 case LTTNG_EVENT_TRACEPOINT
:
1767 case LTTNG_EVENT_SYSCALL
:
1768 case LTTNG_EVENT_PROBE
:
1769 case LTTNG_EVENT_FUNCTION
:
1770 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1771 if (event_name
[0] == '\0') {
1772 ret
= event_kernel_disable_event(kchan
,
1775 ret
= event_kernel_disable_event(kchan
,
1776 event_name
, event
->type
);
1778 if (ret
!= LTTNG_OK
) {
1783 ret
= LTTNG_ERR_UNK
;
1787 kernel_wait_quiescent();
1790 case LTTNG_DOMAIN_UST
:
1792 struct ltt_ust_channel
*uchan
;
1793 struct ltt_ust_session
*usess
;
1795 usess
= session
->ust_session
;
1797 if (validate_ust_event_name(event_name
)) {
1798 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1803 * If a non-default channel has been created in the
1804 * session, explicitly require that -c chan_name needs
1807 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1808 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1812 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1814 if (uchan
== NULL
) {
1815 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1819 switch (event
->type
) {
1820 case LTTNG_EVENT_ALL
:
1822 * An empty event name means that everything
1823 * should be disabled.
1825 if (event
->name
[0] == '\0') {
1826 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1828 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1831 if (ret
!= LTTNG_OK
) {
1836 ret
= LTTNG_ERR_UNK
;
1840 DBG3("Disable UST event %s in channel %s completed", event_name
,
1844 case LTTNG_DOMAIN_LOG4J
:
1845 case LTTNG_DOMAIN_JUL
:
1846 case LTTNG_DOMAIN_PYTHON
:
1849 struct ltt_ust_session
*usess
= session
->ust_session
;
1853 switch (event
->type
) {
1854 case LTTNG_EVENT_ALL
:
1857 ret
= LTTNG_ERR_UNK
;
1861 agt
= trace_ust_find_agent(usess
, domain
);
1863 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1867 * An empty event name means that everything
1868 * should be disabled.
1870 if (event
->name
[0] == '\0') {
1871 ret
= event_agent_disable_all(usess
, agt
);
1873 ret
= event_agent_disable(usess
, agt
, event_name
);
1875 if (ret
!= LTTNG_OK
) {
1882 ret
= LTTNG_ERR_UND
;
1895 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1897 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1898 char *channel_name
, const struct lttng_event_context
*ctx
, int kwpipe
)
1900 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1901 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1904 * Don't try to add a context if the session has been started at
1905 * some point in time before. The tracer does not allow it and would
1906 * result in a corrupted trace.
1908 if (session
->has_been_started
) {
1909 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1913 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1914 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1915 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1919 case LTTNG_DOMAIN_KERNEL
:
1920 assert(session
->kernel_session
);
1922 if (session
->kernel_session
->channel_count
== 0) {
1923 /* Create default channel */
1924 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1925 if (ret
!= LTTNG_OK
) {
1928 chan_kern_created
= 1;
1930 /* Add kernel context to kernel tracer */
1931 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1932 if (ret
!= LTTNG_OK
) {
1936 case LTTNG_DOMAIN_JUL
:
1937 case LTTNG_DOMAIN_LOG4J
:
1940 * Validate channel name.
1941 * If no channel name is given and the domain is JUL or LOG4J,
1942 * set it to the appropriate domain-specific channel name. If
1943 * a name is provided but does not match the expexted channel
1944 * name, return an error.
1946 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1947 strcmp(channel_name
,
1948 DEFAULT_JUL_CHANNEL_NAME
)) {
1949 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1951 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1952 strcmp(channel_name
,
1953 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1954 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1957 /* break is _not_ missing here. */
1959 case LTTNG_DOMAIN_UST
:
1961 struct ltt_ust_session
*usess
= session
->ust_session
;
1962 unsigned int chan_count
;
1966 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1967 if (chan_count
== 0) {
1968 struct lttng_channel
*attr
;
1969 /* Create default channel */
1970 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1972 ret
= LTTNG_ERR_FATAL
;
1976 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1977 if (ret
!= LTTNG_OK
) {
1981 channel_attr_destroy(attr
);
1982 chan_ust_created
= 1;
1985 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1986 free(app_ctx_provider_name
);
1988 app_ctx_name
= NULL
;
1989 app_ctx_provider_name
= NULL
;
1990 if (ret
!= LTTNG_OK
) {
1996 ret
= LTTNG_ERR_UND
;
2004 if (chan_kern_created
) {
2005 struct ltt_kernel_channel
*kchan
=
2006 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
2007 session
->kernel_session
);
2008 /* Created previously, this should NOT fail. */
2010 kernel_destroy_channel(kchan
);
2013 if (chan_ust_created
) {
2014 struct ltt_ust_channel
*uchan
=
2015 trace_ust_find_channel_by_name(
2016 session
->ust_session
->domain_global
.channels
,
2017 DEFAULT_CHANNEL_NAME
);
2018 /* Created previously, this should NOT fail. */
2020 /* Remove from the channel list of the session. */
2021 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
2023 trace_ust_destroy_channel(uchan
);
2026 free(app_ctx_provider_name
);
2031 static inline bool name_starts_with(const char *name
, const char *prefix
)
2033 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
2035 return !strncmp(name
, prefix
, max_cmp_len
);
2038 /* Perform userspace-specific event name validation */
2039 static int validate_ust_event_name(const char *name
)
2049 * Check name against all internal UST event component namespaces used
2052 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
2053 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
2054 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
2063 * Internal version of cmd_enable_event() with a supplemental
2064 * "internal_event" flag which is used to enable internal events which should
2065 * be hidden from clients. Such events are used in the agent implementation to
2066 * enable the events through which all "agent" events are funeled.
2068 static int _cmd_enable_event(struct ltt_session
*session
,
2069 const struct lttng_domain
*domain
,
2070 char *channel_name
, struct lttng_event
*event
,
2071 char *filter_expression
,
2072 struct lttng_filter_bytecode
*filter
,
2073 struct lttng_event_exclusion
*exclusion
,
2074 int wpipe
, bool internal_event
)
2076 int ret
= 0, channel_created
= 0;
2077 struct lttng_channel
*attr
= NULL
;
2081 assert(channel_name
);
2083 /* If we have a filter, we must have its filter expression */
2084 assert(!(!!filter_expression
^ !!filter
));
2086 /* Normalize event name as a globbing pattern */
2087 strutils_normalize_star_glob_pattern(event
->name
);
2089 /* Normalize exclusion names as globbing patterns */
2093 for (i
= 0; i
< exclusion
->count
; i
++) {
2094 char *name
= LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion
, i
);
2096 strutils_normalize_star_glob_pattern(name
);
2100 DBG("Enable event command for event \'%s\'", event
->name
);
2104 switch (domain
->type
) {
2105 case LTTNG_DOMAIN_KERNEL
:
2107 struct ltt_kernel_channel
*kchan
;
2110 * If a non-default channel has been created in the
2111 * session, explicitely require that -c chan_name needs
2114 if (session
->kernel_session
->has_non_default_channel
2115 && channel_name
[0] == '\0') {
2116 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2120 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2121 session
->kernel_session
);
2122 if (kchan
== NULL
) {
2123 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
2124 LTTNG_BUFFER_GLOBAL
);
2126 ret
= LTTNG_ERR_FATAL
;
2129 if (lttng_strncpy(attr
->name
, channel_name
,
2130 sizeof(attr
->name
))) {
2131 ret
= LTTNG_ERR_INVALID
;
2135 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2136 if (ret
!= LTTNG_OK
) {
2139 channel_created
= 1;
2142 /* Get the newly created kernel channel pointer */
2143 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2144 session
->kernel_session
);
2145 if (kchan
== NULL
) {
2146 /* This sould not happen... */
2147 ret
= LTTNG_ERR_FATAL
;
2151 switch (event
->type
) {
2152 case LTTNG_EVENT_ALL
:
2154 char *filter_expression_a
= NULL
;
2155 struct lttng_filter_bytecode
*filter_a
= NULL
;
2158 * We need to duplicate filter_expression and filter,
2159 * because ownership is passed to first enable
2162 if (filter_expression
) {
2163 filter_expression_a
= strdup(filter_expression
);
2164 if (!filter_expression_a
) {
2165 ret
= LTTNG_ERR_FATAL
;
2170 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
2172 free(filter_expression_a
);
2173 ret
= LTTNG_ERR_FATAL
;
2176 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
2178 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
2179 ret
= event_kernel_enable_event(kchan
, event
,
2180 filter_expression
, filter
);
2181 /* We have passed ownership */
2182 filter_expression
= NULL
;
2184 if (ret
!= LTTNG_OK
) {
2185 if (channel_created
) {
2186 /* Let's not leak a useless channel. */
2187 kernel_destroy_channel(kchan
);
2189 free(filter_expression_a
);
2193 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
2194 ret
= event_kernel_enable_event(kchan
, event
,
2195 filter_expression_a
, filter_a
);
2196 /* We have passed ownership */
2197 filter_expression_a
= NULL
;
2199 if (ret
!= LTTNG_OK
) {
2204 case LTTNG_EVENT_PROBE
:
2205 case LTTNG_EVENT_USERSPACE_PROBE
:
2206 case LTTNG_EVENT_FUNCTION
:
2207 case LTTNG_EVENT_FUNCTION_ENTRY
:
2208 case LTTNG_EVENT_TRACEPOINT
:
2209 ret
= event_kernel_enable_event(kchan
, event
,
2210 filter_expression
, filter
);
2211 /* We have passed ownership */
2212 filter_expression
= NULL
;
2214 if (ret
!= LTTNG_OK
) {
2215 if (channel_created
) {
2216 /* Let's not leak a useless channel. */
2217 kernel_destroy_channel(kchan
);
2222 case LTTNG_EVENT_SYSCALL
:
2223 ret
= event_kernel_enable_event(kchan
, event
,
2224 filter_expression
, filter
);
2225 /* We have passed ownership */
2226 filter_expression
= NULL
;
2228 if (ret
!= LTTNG_OK
) {
2233 ret
= LTTNG_ERR_UNK
;
2237 kernel_wait_quiescent();
2240 case LTTNG_DOMAIN_UST
:
2242 struct ltt_ust_channel
*uchan
;
2243 struct ltt_ust_session
*usess
= session
->ust_session
;
2248 * If a non-default channel has been created in the
2249 * session, explicitely require that -c chan_name needs
2252 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
2253 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2257 /* Get channel from global UST domain */
2258 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2260 if (uchan
== NULL
) {
2261 /* Create default channel */
2262 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
2263 usess
->buffer_type
);
2265 ret
= LTTNG_ERR_FATAL
;
2268 if (lttng_strncpy(attr
->name
, channel_name
,
2269 sizeof(attr
->name
))) {
2270 ret
= LTTNG_ERR_INVALID
;
2274 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2275 if (ret
!= LTTNG_OK
) {
2279 /* Get the newly created channel reference back */
2280 uchan
= trace_ust_find_channel_by_name(
2281 usess
->domain_global
.channels
, channel_name
);
2285 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
2287 * Don't allow users to add UST events to channels which
2288 * are assigned to a userspace subdomain (JUL, Log4J,
2291 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
2295 if (!internal_event
) {
2297 * Ensure the event name is not reserved for internal
2300 ret
= validate_ust_event_name(event
->name
);
2302 WARN("Userspace event name %s failed validation.",
2304 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2309 /* At this point, the session and channel exist on the tracer */
2310 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2311 filter_expression
, filter
, exclusion
,
2313 /* We have passed ownership */
2314 filter_expression
= NULL
;
2317 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2318 goto already_enabled
;
2319 } else if (ret
!= LTTNG_OK
) {
2324 case LTTNG_DOMAIN_LOG4J
:
2325 case LTTNG_DOMAIN_JUL
:
2326 case LTTNG_DOMAIN_PYTHON
:
2328 const char *default_event_name
, *default_chan_name
;
2330 struct lttng_event uevent
;
2331 struct lttng_domain tmp_dom
;
2332 struct ltt_ust_session
*usess
= session
->ust_session
;
2336 if (!agent_tracing_is_enabled()) {
2337 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2338 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
2342 agt
= trace_ust_find_agent(usess
, domain
->type
);
2344 agt
= agent_create(domain
->type
);
2346 ret
= LTTNG_ERR_NOMEM
;
2349 agent_add(agt
, usess
->agents
);
2352 /* Create the default tracepoint. */
2353 memset(&uevent
, 0, sizeof(uevent
));
2354 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2355 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2356 default_event_name
= event_get_default_agent_ust_name(
2358 if (!default_event_name
) {
2359 ret
= LTTNG_ERR_FATAL
;
2362 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2363 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2366 * The domain type is changed because we are about to enable the
2367 * default channel and event for the JUL domain that are hardcoded.
2368 * This happens in the UST domain.
2370 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2371 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2373 switch (domain
->type
) {
2374 case LTTNG_DOMAIN_LOG4J
:
2375 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2377 case LTTNG_DOMAIN_JUL
:
2378 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2380 case LTTNG_DOMAIN_PYTHON
:
2381 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2384 /* The switch/case we are in makes this impossible */
2389 char *filter_expression_copy
= NULL
;
2390 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2393 const size_t filter_size
= sizeof(
2394 struct lttng_filter_bytecode
)
2397 filter_copy
= zmalloc(filter_size
);
2399 ret
= LTTNG_ERR_NOMEM
;
2402 memcpy(filter_copy
, filter
, filter_size
);
2404 filter_expression_copy
=
2405 strdup(filter_expression
);
2406 if (!filter_expression
) {
2407 ret
= LTTNG_ERR_NOMEM
;
2410 if (!filter_expression_copy
|| !filter_copy
) {
2411 free(filter_expression_copy
);
2417 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2418 (char *) default_chan_name
,
2419 &uevent
, filter_expression_copy
,
2420 filter_copy
, NULL
, wpipe
);
2423 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2424 goto already_enabled
;
2425 } else if (ret
!= LTTNG_OK
) {
2429 /* The wild card * means that everything should be enabled. */
2430 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2431 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2434 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2438 filter_expression
= NULL
;
2439 if (ret
!= LTTNG_OK
) {
2446 ret
= LTTNG_ERR_UND
;
2454 free(filter_expression
);
2457 channel_attr_destroy(attr
);
2463 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2464 * We own filter, exclusion, and filter_expression.
2466 int cmd_enable_event(struct ltt_session
*session
,
2467 const struct lttng_domain
*domain
,
2468 char *channel_name
, struct lttng_event
*event
,
2469 char *filter_expression
,
2470 struct lttng_filter_bytecode
*filter
,
2471 struct lttng_event_exclusion
*exclusion
,
2474 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2475 filter_expression
, filter
, exclusion
, wpipe
, false);
2479 * Enable an event which is internal to LTTng. An internal should
2480 * never be made visible to clients and are immune to checks such as
2483 static int cmd_enable_event_internal(struct ltt_session
*session
,
2484 const struct lttng_domain
*domain
,
2485 char *channel_name
, struct lttng_event
*event
,
2486 char *filter_expression
,
2487 struct lttng_filter_bytecode
*filter
,
2488 struct lttng_event_exclusion
*exclusion
,
2491 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2492 filter_expression
, filter
, exclusion
, wpipe
, true);
2496 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2498 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2499 struct lttng_event
**events
)
2502 ssize_t nb_events
= 0;
2505 case LTTNG_DOMAIN_KERNEL
:
2506 nb_events
= kernel_list_events(events
);
2507 if (nb_events
< 0) {
2508 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2512 case LTTNG_DOMAIN_UST
:
2513 nb_events
= ust_app_list_events(events
);
2514 if (nb_events
< 0) {
2515 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2519 case LTTNG_DOMAIN_LOG4J
:
2520 case LTTNG_DOMAIN_JUL
:
2521 case LTTNG_DOMAIN_PYTHON
:
2522 nb_events
= agent_list_events(events
, domain
);
2523 if (nb_events
< 0) {
2524 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2529 ret
= LTTNG_ERR_UND
;
2536 /* Return negative value to differentiate return code */
2541 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2543 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2544 struct lttng_event_field
**fields
)
2547 ssize_t nb_fields
= 0;
2550 case LTTNG_DOMAIN_UST
:
2551 nb_fields
= ust_app_list_event_fields(fields
);
2552 if (nb_fields
< 0) {
2553 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2557 case LTTNG_DOMAIN_KERNEL
:
2558 default: /* fall-through */
2559 ret
= LTTNG_ERR_UND
;
2566 /* Return negative value to differentiate return code */
2570 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2572 return syscall_table_list(events
);
2576 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2578 * Called with session lock held.
2580 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2581 enum lttng_domain_type domain
, int32_t **pids
)
2584 ssize_t nr_pids
= 0;
2587 case LTTNG_DOMAIN_KERNEL
:
2589 struct ltt_kernel_session
*ksess
;
2591 ksess
= session
->kernel_session
;
2592 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2594 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2599 case LTTNG_DOMAIN_UST
:
2601 struct ltt_ust_session
*usess
;
2603 usess
= session
->ust_session
;
2604 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2606 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2611 case LTTNG_DOMAIN_LOG4J
:
2612 case LTTNG_DOMAIN_JUL
:
2613 case LTTNG_DOMAIN_PYTHON
:
2615 ret
= LTTNG_ERR_UND
;
2622 /* Return negative value to differentiate return code */
2627 * Command LTTNG_START_TRACE processed by the client thread.
2629 * Called with session mutex held.
2631 int cmd_start_trace(struct ltt_session
*session
)
2633 enum lttng_error_code ret
;
2634 unsigned long nb_chan
= 0;
2635 struct ltt_kernel_session
*ksession
;
2636 struct ltt_ust_session
*usess
;
2637 const bool session_rotated_after_last_stop
=
2638 session
->rotated_after_last_stop
;
2642 /* Ease our life a bit ;) */
2643 ksession
= session
->kernel_session
;
2644 usess
= session
->ust_session
;
2646 /* Is the session already started? */
2647 if (session
->active
) {
2648 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2652 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
&&
2653 !session
->current_trace_chunk
) {
2655 * A rotation was launched while the session was stopped and
2656 * it has not been completed yet. It is not possible to start
2657 * the session since starting the session here would require a
2658 * rotation from "NULL" to a new trace chunk. That rotation
2659 * would overlap with the ongoing rotation, which is not
2662 WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing",
2664 ret
= LTTNG_ERR_ROTATION_PENDING
;
2669 * Starting a session without channel is useless since after that it's not
2670 * possible to enable channel thus inform the client.
2672 if (usess
&& usess
->domain_global
.channels
) {
2673 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2676 nb_chan
+= ksession
->channel_count
;
2679 ret
= LTTNG_ERR_NO_CHANNEL
;
2683 session
->active
= 1;
2684 session
->rotated_after_last_stop
= false;
2685 if (session
->output_traces
&& !session
->current_trace_chunk
) {
2686 if (!session
->has_been_started
) {
2687 struct lttng_trace_chunk
*trace_chunk
;
2689 DBG("Creating initial trace chunk of session \"%s\"",
2691 trace_chunk
= session_create_new_trace_chunk(
2692 session
, NULL
, NULL
, NULL
);
2694 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
2697 assert(!session
->current_trace_chunk
);
2698 ret
= session_set_trace_chunk(session
, trace_chunk
,
2700 lttng_trace_chunk_put(trace_chunk
);
2702 ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
2706 DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk",
2709 * Rotate existing streams into the new chunk.
2710 * This is a "quiet" rotation has no client has
2711 * explicitly requested this operation.
2713 * There is also no need to wait for the rotation
2714 * to complete as it will happen immediately. No data
2715 * was produced as the session was stopped, so the
2716 * rotation should happen on reception of the command.
2718 ret
= cmd_rotate_session(session
, NULL
, true,
2719 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
);
2720 if (ret
!= LTTNG_OK
) {
2726 /* Kernel tracing */
2727 if (ksession
!= NULL
) {
2728 DBG("Start kernel tracing session %s", session
->name
);
2729 ret
= start_kernel_session(ksession
);
2730 if (ret
!= LTTNG_OK
) {
2735 /* Flag session that trace should start automatically */
2737 int int_ret
= ust_app_start_trace_all(usess
);
2740 ret
= LTTNG_ERR_UST_START_FAIL
;
2746 * Clear the flag that indicates that a rotation was done while the
2747 * session was stopped.
2749 session
->rotated_after_last_stop
= false;
2751 if (session
->rotate_timer_period
) {
2752 int int_ret
= timer_session_rotation_schedule_timer_start(
2753 session
, session
->rotate_timer_period
);
2756 ERR("Failed to enable rotate timer");
2757 ret
= LTTNG_ERR_UNK
;
2765 if (ret
== LTTNG_OK
) {
2766 /* Flag this after a successful start. */
2767 session
->has_been_started
|= 1;
2769 session
->active
= 0;
2770 /* Restore initial state on error. */
2771 session
->rotated_after_last_stop
=
2772 session_rotated_after_last_stop
;
2778 * Command LTTNG_STOP_TRACE processed by the client thread.
2780 int cmd_stop_trace(struct ltt_session
*session
)
2783 struct ltt_kernel_session
*ksession
;
2784 struct ltt_ust_session
*usess
;
2788 DBG("Begin stop session \"%s\" (id %" PRIu64
")", session
->name
, session
->id
);
2790 ksession
= session
->kernel_session
;
2791 usess
= session
->ust_session
;
2793 /* Session is not active. Skip everythong and inform the client. */
2794 if (!session
->active
) {
2795 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2799 ret
= stop_kernel_session(ksession
);
2800 if (ret
!= LTTNG_OK
) {
2804 if (usess
&& usess
->active
) {
2805 ret
= ust_app_stop_trace_all(usess
);
2807 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2812 DBG("Completed stop session \"%s\" (id %" PRIu64
")", session
->name
,
2814 /* Flag inactive after a successful stop. */
2815 session
->active
= 0;
2823 * Set the base_path of the session only if subdir of a control uris is set.
2824 * Return LTTNG_OK on success, otherwise LTTNG_ERR_*.
2826 static int set_session_base_path_from_uris(struct ltt_session
*session
,
2828 struct lttng_uri
*uris
)
2833 for (i
= 0; i
< nb_uri
; i
++) {
2834 if (uris
[i
].stype
!= LTTNG_STREAM_CONTROL
||
2835 uris
[i
].subdir
[0] == '\0') {
2836 /* Not interested in these URIs */
2840 if (session
->base_path
!= NULL
) {
2841 free(session
->base_path
);
2842 session
->base_path
= NULL
;
2845 /* Set session base_path */
2846 session
->base_path
= strdup(uris
[i
].subdir
);
2847 if (!session
->base_path
) {
2848 PERROR("Failed to copy base path \"%s\" to session \"%s\"",
2849 uris
[i
].subdir
, session
->name
);
2850 ret
= LTTNG_ERR_NOMEM
;
2853 DBG2("Setting base path \"%s\" for session \"%s\"",
2854 session
->base_path
, session
->name
);
2862 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2864 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2865 struct lttng_uri
*uris
)
2868 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2869 struct ltt_ust_session
*usess
= session
->ust_session
;
2875 /* Can't set consumer URI if the session is active. */
2876 if (session
->active
) {
2877 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2882 * Set the session base path if any. This is done inside
2883 * cmd_set_consumer_uri to preserve backward compatibility of the
2884 * previous session creation api vs the session descriptor api.
2886 ret
= set_session_base_path_from_uris(session
, nb_uri
, uris
);
2887 if (ret
!= LTTNG_OK
) {
2891 /* Set the "global" consumer URIs */
2892 for (i
= 0; i
< nb_uri
; i
++) {
2893 ret
= add_uri_to_consumer(session
, session
->consumer
, &uris
[i
],
2895 if (ret
!= LTTNG_OK
) {
2900 /* Set UST session URIs */
2901 if (session
->ust_session
) {
2902 for (i
= 0; i
< nb_uri
; i
++) {
2903 ret
= add_uri_to_consumer(session
,
2904 session
->ust_session
->consumer
,
2905 &uris
[i
], LTTNG_DOMAIN_UST
);
2906 if (ret
!= LTTNG_OK
) {
2912 /* Set kernel session URIs */
2913 if (session
->kernel_session
) {
2914 for (i
= 0; i
< nb_uri
; i
++) {
2915 ret
= add_uri_to_consumer(session
,
2916 session
->kernel_session
->consumer
,
2917 &uris
[i
], LTTNG_DOMAIN_KERNEL
);
2918 if (ret
!= LTTNG_OK
) {
2925 * Make sure to set the session in output mode after we set URI since a
2926 * session can be created without URL (thus flagged in no output mode).
2928 session
->output_traces
= 1;
2930 ksess
->output_traces
= 1;
2934 usess
->output_traces
= 1;
2945 enum lttng_error_code
set_session_output_from_descriptor(
2946 struct ltt_session
*session
,
2947 const struct lttng_session_descriptor
*descriptor
)
2950 enum lttng_error_code ret_code
= LTTNG_OK
;
2951 enum lttng_session_descriptor_type session_type
=
2952 lttng_session_descriptor_get_type(descriptor
);
2953 enum lttng_session_descriptor_output_type output_type
=
2954 lttng_session_descriptor_get_output_type(descriptor
);
2955 struct lttng_uri uris
[2] = {};
2956 size_t uri_count
= 0;
2958 switch (output_type
) {
2959 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE
:
2961 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL
:
2962 lttng_session_descriptor_get_local_output_uri(descriptor
,
2966 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK
:
2967 lttng_session_descriptor_get_network_output_uris(descriptor
,
2968 &uris
[0], &uris
[1]);
2972 ret_code
= LTTNG_ERR_INVALID
;
2976 switch (session_type
) {
2977 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
2979 struct snapshot_output
*new_output
= NULL
;
2981 new_output
= snapshot_output_alloc();
2983 ret_code
= LTTNG_ERR_NOMEM
;
2987 ret
= snapshot_output_init_with_uri(session
,
2988 DEFAULT_SNAPSHOT_MAX_SIZE
,
2989 NULL
, uris
, uri_count
, session
->consumer
,
2990 new_output
, &session
->snapshot
);
2992 ret_code
= (ret
== -ENOMEM
) ?
2993 LTTNG_ERR_NOMEM
: LTTNG_ERR_INVALID
;
2994 snapshot_output_destroy(new_output
);
2997 snapshot_add_output(&session
->snapshot
, new_output
);
3000 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR
:
3001 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
3003 ret_code
= cmd_set_consumer_uri(session
, uri_count
, uris
);
3007 ret_code
= LTTNG_ERR_INVALID
;
3015 enum lttng_error_code
cmd_create_session_from_descriptor(
3016 struct lttng_session_descriptor
*descriptor
,
3017 const lttng_sock_cred
*creds
,
3018 const char *home_path
)
3021 enum lttng_error_code ret_code
;
3022 const char *session_name
;
3023 struct ltt_session
*new_session
= NULL
;
3024 enum lttng_session_descriptor_status descriptor_status
;
3026 session_lock_list();
3028 if (*home_path
!= '/') {
3029 ERR("Home path provided by client is not absolute");
3030 ret_code
= LTTNG_ERR_INVALID
;
3035 descriptor_status
= lttng_session_descriptor_get_session_name(
3036 descriptor
, &session_name
);
3037 switch (descriptor_status
) {
3038 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK
:
3040 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET
:
3041 session_name
= NULL
;
3044 ret_code
= LTTNG_ERR_INVALID
;
3048 ret_code
= session_create(session_name
, creds
->uid
, creds
->gid
,
3050 if (ret_code
!= LTTNG_OK
) {
3054 if (!session_name
) {
3055 ret
= lttng_session_descriptor_set_session_name(descriptor
,
3058 ret_code
= LTTNG_ERR_SESSION_FAIL
;
3063 if (!lttng_session_descriptor_is_output_destination_initialized(
3066 * Only include the session's creation time in the output
3067 * destination if the name of the session itself was
3068 * not auto-generated.
3070 ret_code
= lttng_session_descriptor_set_default_output(
3072 session_name
? &new_session
->creation_time
: NULL
,
3074 if (ret_code
!= LTTNG_OK
) {
3078 new_session
->has_user_specified_directory
=
3079 lttng_session_descriptor_has_output_directory(
3083 switch (lttng_session_descriptor_get_type(descriptor
)) {
3084 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
3085 new_session
->snapshot_mode
= 1;
3087 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
3088 new_session
->live_timer
=
3089 lttng_session_descriptor_live_get_timer_interval(
3096 ret_code
= set_session_output_from_descriptor(new_session
, descriptor
);
3097 if (ret_code
!= LTTNG_OK
) {
3100 new_session
->consumer
->enabled
= 1;
3101 ret_code
= LTTNG_OK
;
3103 /* Release reference provided by the session_create function. */
3104 session_put(new_session
);
3105 if (ret_code
!= LTTNG_OK
&& new_session
) {
3106 /* Release the global reference on error. */
3107 session_destroy(new_session
);
3109 session_unlock_list();
3113 enum lttng_error_code
cmd_create_session(struct command_ctx
*cmd_ctx
, int sock
,
3114 struct lttng_session_descriptor
**return_descriptor
)
3117 size_t payload_size
;
3118 struct lttng_dynamic_buffer payload
;
3119 struct lttng_buffer_view home_dir_view
;
3120 struct lttng_buffer_view session_descriptor_view
;
3121 struct lttng_session_descriptor
*session_descriptor
= NULL
;
3122 enum lttng_error_code ret_code
;
3124 lttng_dynamic_buffer_init(&payload
);
3125 if (cmd_ctx
->lsm
->u
.create_session
.home_dir_size
>=
3127 ret_code
= LTTNG_ERR_INVALID
;
3130 if (cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
>
3131 LTTNG_SESSION_DESCRIPTOR_MAX_LEN
) {
3132 ret_code
= LTTNG_ERR_INVALID
;
3136 payload_size
= cmd_ctx
->lsm
->u
.create_session
.home_dir_size
+
3137 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
;
3138 ret
= lttng_dynamic_buffer_set_size(&payload
, payload_size
);
3140 ret_code
= LTTNG_ERR_NOMEM
;
3144 ret
= lttcomm_recv_unix_sock(sock
, payload
.data
, payload
.size
);
3146 ERR("Reception of session descriptor failed, aborting.");
3147 ret_code
= LTTNG_ERR_SESSION_FAIL
;
3151 home_dir_view
= lttng_buffer_view_from_dynamic_buffer(
3154 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
);
3155 session_descriptor_view
= lttng_buffer_view_from_dynamic_buffer(
3157 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
,
3158 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
);
3160 ret
= lttng_session_descriptor_create_from_buffer(
3161 &session_descriptor_view
, &session_descriptor
);
3163 ERR("Failed to create session descriptor from payload of \"create session\" command");
3164 ret_code
= LTTNG_ERR_INVALID
;
3169 * Sets the descriptor's auto-generated properties (name, output) if
3172 ret_code
= cmd_create_session_from_descriptor(session_descriptor
,
3174 home_dir_view
.size
? home_dir_view
.data
: NULL
);
3175 if (ret_code
!= LTTNG_OK
) {
3179 ret_code
= LTTNG_OK
;
3180 *return_descriptor
= session_descriptor
;
3181 session_descriptor
= NULL
;
3183 lttng_dynamic_buffer_reset(&payload
);
3184 lttng_session_descriptor_destroy(session_descriptor
);
3189 void cmd_destroy_session_reply(const struct ltt_session
*session
,
3190 void *_reply_context
)
3194 const struct cmd_destroy_session_reply_context
*reply_context
=
3196 struct lttng_dynamic_buffer payload
;
3197 struct lttcomm_session_destroy_command_header cmd_header
;
3198 struct lttng_trace_archive_location
*location
= NULL
;
3199 struct lttcomm_lttng_msg llm
= {
3200 .cmd_type
= LTTNG_DESTROY_SESSION
,
3201 .ret_code
= reply_context
->destruction_status
,
3204 sizeof(struct lttcomm_session_destroy_command_header
),
3207 size_t payload_size_before_location
;
3209 lttng_dynamic_buffer_init(&payload
);
3211 ret
= lttng_dynamic_buffer_append(&payload
, &llm
, sizeof(llm
));
3213 ERR("Failed to append session destruction message");
3217 cmd_header
.rotation_state
=
3218 (int32_t) (reply_context
->implicit_rotation_on_destroy
?
3219 session
->rotation_state
:
3220 LTTNG_ROTATION_STATE_NO_ROTATION
);
3221 ret
= lttng_dynamic_buffer_append(&payload
, &cmd_header
,
3222 sizeof(cmd_header
));
3224 ERR("Failed to append session destruction command header");
3228 if (!reply_context
->implicit_rotation_on_destroy
) {
3229 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3233 if (session
->rotation_state
!= LTTNG_ROTATION_STATE_COMPLETED
) {
3234 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3239 location
= session_get_trace_archive_location(session
);
3241 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3246 payload_size_before_location
= payload
.size
;
3247 comm_ret
= lttng_trace_archive_location_serialize(location
,
3250 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3254 /* Update the message to indicate the location's length. */
3255 ((struct lttcomm_lttng_msg
*) payload
.data
)->data_size
=
3256 payload
.size
- payload_size_before_location
;
3258 comm_ret
= lttcomm_send_unix_sock(reply_context
->reply_sock_fd
,
3259 payload
.data
, payload
.size
);
3260 if (comm_ret
!= (ssize_t
) payload
.size
) {
3261 ERR("Failed to send result of the destruction of session \"%s\" to client",
3265 ret
= close(reply_context
->reply_sock_fd
);
3267 PERROR("Failed to close client socket in deferred session destroy reply");
3269 lttng_dynamic_buffer_reset(&payload
);
3270 free(_reply_context
);
3274 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3276 * Called with session lock held.
3278 int cmd_destroy_session(struct ltt_session
*session
,
3279 struct notification_thread_handle
*notification_thread_handle
,
3283 enum lttng_error_code destruction_last_error
= LTTNG_OK
;
3284 struct cmd_destroy_session_reply_context
*reply_context
= NULL
;
3287 reply_context
= zmalloc(sizeof(*reply_context
));
3288 if (!reply_context
) {
3289 ret
= LTTNG_ERR_NOMEM
;
3292 reply_context
->reply_sock_fd
= *sock_fd
;
3298 DBG("Begin destroy session %s (id %" PRIu64
")", session
->name
,
3300 if (session
->active
) {
3301 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3303 ret
= cmd_stop_trace(session
);
3304 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
3305 /* Carry on with the destruction of the session. */
3306 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3307 session
->name
, lttng_strerror(-ret
));
3308 destruction_last_error
= ret
;
3312 if (session
->rotation_schedule_timer_enabled
) {
3313 if (timer_session_rotation_schedule_timer_stop(
3315 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3317 destruction_last_error
= LTTNG_ERR_TIMER_STOP_ERROR
;
3321 if (session
->rotate_size
) {
3322 unsubscribe_session_consumed_size_rotation(session
, notification_thread_handle
);
3323 session
->rotate_size
= 0;
3326 if (session
->most_recent_chunk_id
.is_set
&&
3327 session
->most_recent_chunk_id
.value
!= 0 &&
3328 session
->current_trace_chunk
&& session
->output_traces
) {
3330 * Perform a last rotation on destruction if rotations have
3331 * occurred during the session's lifetime.
3333 ret
= cmd_rotate_session(session
, NULL
, false,
3334 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
);
3335 if (ret
!= LTTNG_OK
) {
3336 ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s",
3337 session
->name
, lttng_strerror(-ret
));
3338 destruction_last_error
= -ret
;
3340 if (reply_context
) {
3341 reply_context
->implicit_rotation_on_destroy
= true;
3343 } else if (session
->has_been_started
&& session
->current_trace_chunk
) {
3345 * The user has not triggered a session rotation. However, to
3346 * ensure all data has been consumed, the session is rotated
3347 * to a 'null' trace chunk before it is destroyed.
3349 * This is a "quiet" rotation meaning that no notification is
3350 * emitted and no renaming of the current trace chunk takes
3353 ret
= cmd_rotate_session(session
, NULL
, true,
3354 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
);
3355 if (ret
!= LTTNG_OK
) {
3356 ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s",
3357 session
->name
, lttng_strerror(-ret
));
3358 destruction_last_error
= -ret
;
3362 if (session
->shm_path
[0]) {
3364 * When a session is created with an explicit shm_path,
3365 * the consumer daemon will create its shared memory files
3366 * at that location and will *not* unlink them. This is normal
3367 * as the intention of that feature is to make it possible
3368 * to retrieve the content of those files should a crash occur.
3370 * To ensure the content of those files can be used, the
3371 * sessiond daemon will replicate the content of the metadata
3372 * cache in a metadata file.
3374 * On clean-up, it is expected that the consumer daemon will
3375 * unlink the shared memory files and that the session daemon
3376 * will unlink the metadata file. Then, the session's directory
3377 * in the shm path can be removed.
3379 * Unfortunately, a flaw in the design of the sessiond's and
3380 * consumerd's tear down of channels makes it impossible to
3381 * determine when the sessiond _and_ the consumerd have both
3382 * destroyed their representation of a channel. For one, the
3383 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3384 * callbacks in both daemons.
3386 * However, it is also impossible for the sessiond to know when
3387 * the consumer daemon is done destroying its channel(s) since
3388 * it occurs as a reaction to the closing of the channel's file
3389 * descriptor. There is no resulting communication initiated
3390 * from the consumerd to the sessiond to confirm that the
3391 * operation is completed (and was successful).
3393 * Until this is all fixed, the session daemon checks for the
3394 * removal of the session's shm path which makes it possible
3395 * to safely advertise a session as having been destroyed.
3397 * Prior to this fix, it was not possible to reliably save
3398 * a session making use of the --shm-path option, destroy it,
3399 * and load it again. This is because the creation of the
3400 * session would fail upon seeing the session's shm path
3401 * already in existence.
3403 * Note that none of the error paths in the check for the
3404 * directory's existence return an error. This is normal
3405 * as there isn't much that can be done. The session will
3406 * be destroyed properly, except that we can't offer the
3407 * guarantee that the same session can be re-created.
3409 current_completion_handler
= &destroy_completion_handler
.handler
;
3410 ret
= lttng_strncpy(destroy_completion_handler
.shm_path
,
3412 sizeof(destroy_completion_handler
.shm_path
));
3417 * The session is destroyed. However, note that the command context
3418 * still holds a reference to the session, thus delaying its destruction
3419 * _at least_ up to the point when that reference is released.
3421 session_destroy(session
);
3422 if (reply_context
) {
3423 reply_context
->destruction_status
= destruction_last_error
;
3424 ret
= session_add_destroy_notifier(session
,
3425 cmd_destroy_session_reply
,
3426 (void *) reply_context
);
3428 ret
= LTTNG_ERR_FATAL
;
3440 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3442 int cmd_register_consumer(struct ltt_session
*session
,
3443 enum lttng_domain_type domain
, const char *sock_path
,
3444 struct consumer_data
*cdata
)
3447 struct consumer_socket
*socket
= NULL
;
3454 case LTTNG_DOMAIN_KERNEL
:
3456 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3460 /* Can't register a consumer if there is already one */
3461 if (ksess
->consumer_fds_sent
!= 0) {
3462 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3466 sock
= lttcomm_connect_unix_sock(sock_path
);
3468 ret
= LTTNG_ERR_CONNECT_FAIL
;
3471 cdata
->cmd_sock
= sock
;
3473 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
3474 if (socket
== NULL
) {
3477 PERROR("close register consumer");
3479 cdata
->cmd_sock
= -1;
3480 ret
= LTTNG_ERR_FATAL
;
3484 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
3485 if (socket
->lock
== NULL
) {
3486 PERROR("zmalloc pthread mutex");
3487 ret
= LTTNG_ERR_FATAL
;
3490 pthread_mutex_init(socket
->lock
, NULL
);
3491 socket
->registered
= 1;
3494 consumer_add_socket(socket
, ksess
->consumer
);
3497 pthread_mutex_lock(&cdata
->pid_mutex
);
3499 pthread_mutex_unlock(&cdata
->pid_mutex
);
3504 /* TODO: Userspace tracing */
3505 ret
= LTTNG_ERR_UND
;
3513 consumer_destroy_socket(socket
);
3519 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3521 ssize_t
cmd_list_domains(struct ltt_session
*session
,
3522 struct lttng_domain
**domains
)
3527 struct lttng_ht_iter iter
;
3529 if (session
->kernel_session
!= NULL
) {
3530 DBG3("Listing domains found kernel domain");
3534 if (session
->ust_session
!= NULL
) {
3535 DBG3("Listing domains found UST global domain");
3539 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3541 if (agt
->being_used
) {
3552 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3553 if (*domains
== NULL
) {
3554 ret
= LTTNG_ERR_FATAL
;
3558 if (session
->kernel_session
!= NULL
) {
3559 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3561 /* Kernel session buffer type is always GLOBAL */
3562 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
3567 if (session
->ust_session
!= NULL
) {
3568 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3569 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3573 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3575 if (agt
->being_used
) {
3576 (*domains
)[index
].type
= agt
->domain
;
3577 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3587 /* Return negative value to differentiate return code */
3593 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3595 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
3596 struct ltt_session
*session
, struct lttng_channel
**channels
)
3598 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
3601 case LTTNG_DOMAIN_KERNEL
:
3602 if (session
->kernel_session
!= NULL
) {
3603 nb_chan
= session
->kernel_session
->channel_count
;
3605 DBG3("Number of kernel channels %zd", nb_chan
);
3607 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
3611 case LTTNG_DOMAIN_UST
:
3612 if (session
->ust_session
!= NULL
) {
3614 nb_chan
= lttng_ht_get_count(
3615 session
->ust_session
->domain_global
.channels
);
3618 DBG3("Number of UST global channels %zd", nb_chan
);
3620 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
3625 ret
= -LTTNG_ERR_UND
;
3630 const size_t channel_size
= sizeof(struct lttng_channel
) +
3631 sizeof(struct lttng_channel_extended
);
3632 struct lttng_channel_extended
*channel_exts
;
3634 payload_size
= nb_chan
* channel_size
;
3635 *channels
= zmalloc(payload_size
);
3636 if (*channels
== NULL
) {
3637 ret
= -LTTNG_ERR_FATAL
;
3641 channel_exts
= ((void *) *channels
) +
3642 (nb_chan
* sizeof(struct lttng_channel
));
3643 ret
= list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3644 if (ret
!= LTTNG_OK
) {
3659 * Command LTTNG_LIST_EVENTS processed by the client thread.
3661 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3662 struct ltt_session
*session
, char *channel_name
,
3663 struct lttng_event
**events
, size_t *total_size
)
3666 ssize_t nb_event
= 0;
3669 case LTTNG_DOMAIN_KERNEL
:
3670 if (session
->kernel_session
!= NULL
) {
3671 nb_event
= list_lttng_kernel_events(channel_name
,
3672 session
->kernel_session
, events
,
3676 case LTTNG_DOMAIN_UST
:
3678 if (session
->ust_session
!= NULL
) {
3679 nb_event
= list_lttng_ust_global_events(channel_name
,
3680 &session
->ust_session
->domain_global
, events
,
3685 case LTTNG_DOMAIN_LOG4J
:
3686 case LTTNG_DOMAIN_JUL
:
3687 case LTTNG_DOMAIN_PYTHON
:
3688 if (session
->ust_session
) {
3689 struct lttng_ht_iter iter
;
3693 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3694 &iter
.iter
, agt
, node
.node
) {
3695 if (agt
->domain
== domain
) {
3696 nb_event
= list_lttng_agent_events(
3706 ret
= LTTNG_ERR_UND
;
3713 /* Return negative value to differentiate return code */
3718 * Using the session list, filled a lttng_session array to send back to the
3719 * client for session listing.
3721 * The session list lock MUST be acquired before calling this function. Use
3722 * session_lock_list() and session_unlock_list().
3724 void cmd_list_lttng_sessions(struct lttng_session
*sessions
,
3725 size_t session_count
, uid_t uid
, gid_t gid
)
3729 struct ltt_session
*session
;
3730 struct ltt_session_list
*list
= session_get_list();
3731 struct lttng_session_extended
*extended
=
3732 (typeof(extended
)) (&sessions
[session_count
]);
3734 DBG("Getting all available session for UID %d GID %d",
3737 * Iterate over session list and append data after the control struct in
3740 cds_list_for_each_entry(session
, &list
->head
, list
) {
3741 if (!session_get(session
)) {
3745 * Only list the sessions the user can control.
3747 if (!session_access_ok(session
, uid
, gid
) ||
3748 session
->destroyed
) {
3749 session_put(session
);
3753 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3754 struct ltt_ust_session
*usess
= session
->ust_session
;
3756 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3757 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3758 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3759 ret
= build_network_session_path(sessions
[i
].path
,
3760 sizeof(sessions
[i
].path
), session
);
3762 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3763 session
->consumer
->dst
.session_root_path
);
3766 PERROR("snprintf session path");
3767 session_put(session
);
3771 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3772 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3773 sessions
[i
].enabled
= session
->active
;
3774 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3775 sessions
[i
].live_timer_interval
= session
->live_timer
;
3776 extended
[i
].creation_time
.value
= (uint64_t) session
->creation_time
;
3777 extended
[i
].creation_time
.is_set
= 1;
3779 session_put(session
);
3784 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3785 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3787 int cmd_data_pending(struct ltt_session
*session
)
3790 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3791 struct ltt_ust_session
*usess
= session
->ust_session
;
3795 DBG("Data pending for session %s", session
->name
);
3797 /* Session MUST be stopped to ask for data availability. */
3798 if (session
->active
) {
3799 ret
= LTTNG_ERR_SESSION_STARTED
;
3803 * If stopped, just make sure we've started before else the above call
3804 * will always send that there is data pending.
3806 * The consumer assumes that when the data pending command is received,
3807 * the trace has been started before or else no output data is written
3808 * by the streams which is a condition for data pending. So, this is
3809 * *VERY* important that we don't ask the consumer before a start
3812 if (!session
->has_been_started
) {
3818 /* A rotation is still pending, we have to wait. */
3819 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
3820 DBG("Rotate still pending for session %s", session
->name
);
3825 if (ksess
&& ksess
->consumer
) {
3826 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3828 /* Data is still being extracted for the kernel. */
3833 if (usess
&& usess
->consumer
) {
3834 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3836 /* Data is still being extracted for the kernel. */
3841 /* Data is ready to be read by a viewer */
3849 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3851 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3853 int cmd_snapshot_add_output(struct ltt_session
*session
,
3854 const struct lttng_snapshot_output
*output
, uint32_t *id
)
3857 struct snapshot_output
*new_output
;
3862 DBG("Cmd snapshot add output for session %s", session
->name
);
3865 * Can't create an output if the session is not set in no-output mode.
3867 if (session
->output_traces
) {
3868 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3872 if (session
->has_non_mmap_channel
) {
3873 ret
= LTTNG_ERR_SNAPSHOT_UNSUPPORTED
;
3877 /* Only one output is allowed until we have the "tee" feature. */
3878 if (session
->snapshot
.nb_output
== 1) {
3879 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3883 new_output
= snapshot_output_alloc();
3885 ret
= LTTNG_ERR_NOMEM
;
3889 ret
= snapshot_output_init(session
, output
->max_size
, output
->name
,
3890 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3891 &session
->snapshot
);
3893 if (ret
== -ENOMEM
) {
3894 ret
= LTTNG_ERR_NOMEM
;
3896 ret
= LTTNG_ERR_INVALID
;
3902 snapshot_add_output(&session
->snapshot
, new_output
);
3904 *id
= new_output
->id
;
3911 snapshot_output_destroy(new_output
);
3917 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3919 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3921 int cmd_snapshot_del_output(struct ltt_session
*session
,
3922 const struct lttng_snapshot_output
*output
)
3925 struct snapshot_output
*sout
= NULL
;
3933 * Permission denied to create an output if the session is not
3934 * set in no output mode.
3936 if (session
->output_traces
) {
3937 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3942 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3944 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3945 } else if (*output
->name
!= '\0') {
3946 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3948 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3951 ret
= LTTNG_ERR_INVALID
;
3955 snapshot_delete_output(&session
->snapshot
, sout
);
3956 snapshot_output_destroy(sout
);
3965 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3967 * If no output is available, outputs is untouched and 0 is returned.
3969 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3971 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3972 struct lttng_snapshot_output
**outputs
)
3975 struct lttng_snapshot_output
*list
= NULL
;
3976 struct lttng_ht_iter iter
;
3977 struct snapshot_output
*output
;
3982 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3985 * Permission denied to create an output if the session is not
3986 * set in no output mode.
3988 if (session
->output_traces
) {
3989 ret
= -LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3993 if (session
->snapshot
.nb_output
== 0) {
3998 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
4000 ret
= -LTTNG_ERR_NOMEM
;
4004 /* Copy list from session to the new list object. */
4006 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
4007 output
, node
.node
) {
4008 assert(output
->consumer
);
4009 list
[idx
].id
= output
->id
;
4010 list
[idx
].max_size
= output
->max_size
;
4011 if (lttng_strncpy(list
[idx
].name
, output
->name
,
4012 sizeof(list
[idx
].name
))) {
4013 ret
= -LTTNG_ERR_INVALID
;
4016 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
4017 if (lttng_strncpy(list
[idx
].ctrl_url
,
4018 output
->consumer
->dst
.session_root_path
,
4019 sizeof(list
[idx
].ctrl_url
))) {
4020 ret
= -LTTNG_ERR_INVALID
;
4025 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
4026 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
4028 ret
= -LTTNG_ERR_NOMEM
;
4033 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
4034 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
4036 ret
= -LTTNG_ERR_NOMEM
;
4045 ret
= session
->snapshot
.nb_output
;
4054 * Check if we can regenerate the metadata for this session.
4055 * Only kernel, UST per-uid and non-live sessions are supported.
4057 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
4060 int check_regenerate_metadata_support(struct ltt_session
*session
)
4066 if (session
->live_timer
!= 0) {
4067 ret
= LTTNG_ERR_LIVE_SESSION
;
4070 if (!session
->active
) {
4071 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
4074 if (session
->ust_session
) {
4075 switch (session
->ust_session
->buffer_type
) {
4076 case LTTNG_BUFFER_PER_UID
:
4078 case LTTNG_BUFFER_PER_PID
:
4079 ret
= LTTNG_ERR_PER_PID_SESSION
;
4083 ret
= LTTNG_ERR_UNK
;
4087 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
4088 session
->consumer
->relay_minor_version
< 8) {
4089 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
4099 int clear_metadata_file(int fd
)
4104 lseek_ret
= lseek(fd
, 0, SEEK_SET
);
4105 if (lseek_ret
< 0) {
4111 ret
= ftruncate(fd
, 0);
4113 PERROR("ftruncate");
4122 int ust_regenerate_metadata(struct ltt_ust_session
*usess
)
4125 struct buffer_reg_uid
*uid_reg
= NULL
;
4126 struct buffer_reg_session
*session_reg
= NULL
;
4129 cds_list_for_each_entry(uid_reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4130 struct ust_registry_session
*registry
;
4131 struct ust_registry_channel
*chan
;
4132 struct lttng_ht_iter iter_chan
;
4134 session_reg
= uid_reg
->registry
;
4135 registry
= session_reg
->reg
.ust
;
4137 pthread_mutex_lock(®istry
->lock
);
4138 registry
->metadata_len_sent
= 0;
4139 memset(registry
->metadata
, 0, registry
->metadata_alloc_len
);
4140 registry
->metadata_len
= 0;
4141 registry
->metadata_version
++;
4142 if (registry
->metadata_fd
> 0) {
4143 /* Clear the metadata file's content. */
4144 ret
= clear_metadata_file(registry
->metadata_fd
);
4146 pthread_mutex_unlock(®istry
->lock
);
4151 ret
= ust_metadata_session_statedump(registry
, NULL
,
4152 registry
->major
, registry
->minor
);
4154 pthread_mutex_unlock(®istry
->lock
);
4155 ERR("Failed to generate session metadata (err = %d)",
4159 cds_lfht_for_each_entry(registry
->channels
->ht
, &iter_chan
.iter
,
4161 struct ust_registry_event
*event
;
4162 struct lttng_ht_iter iter_event
;
4164 ret
= ust_metadata_channel_statedump(registry
, chan
);
4166 pthread_mutex_unlock(®istry
->lock
);
4167 ERR("Failed to generate channel metadata "
4171 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter_event
.iter
,
4173 ret
= ust_metadata_event_statedump(registry
,
4176 pthread_mutex_unlock(®istry
->lock
);
4177 ERR("Failed to generate event metadata "
4183 pthread_mutex_unlock(®istry
->lock
);
4192 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
4194 * Ask the consumer to truncate the existing metadata file(s) and
4195 * then regenerate the metadata. Live and per-pid sessions are not
4196 * supported and return an error.
4198 * Return 0 on success or else a LTTNG_ERR code.
4200 int cmd_regenerate_metadata(struct ltt_session
*session
)
4206 ret
= check_regenerate_metadata_support(session
);
4211 if (session
->kernel_session
) {
4212 ret
= kernctl_session_regenerate_metadata(
4213 session
->kernel_session
->fd
);
4215 ERR("Failed to regenerate the kernel metadata");
4220 if (session
->ust_session
) {
4221 ret
= ust_regenerate_metadata(session
->ust_session
);
4223 ERR("Failed to regenerate the UST metadata");
4227 DBG("Cmd metadata regenerate for session %s", session
->name
);
4235 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
4237 * Ask the tracer to regenerate a new statedump.
4239 * Return 0 on success or else a LTTNG_ERR code.
4241 int cmd_regenerate_statedump(struct ltt_session
*session
)
4247 if (!session
->active
) {
4248 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
4252 if (session
->kernel_session
) {
4253 ret
= kernctl_session_regenerate_statedump(
4254 session
->kernel_session
->fd
);
4256 * Currently, the statedump in kernel can only fail if out
4260 if (ret
== -ENOMEM
) {
4261 ret
= LTTNG_ERR_REGEN_STATEDUMP_NOMEM
;
4263 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4265 ERR("Failed to regenerate the kernel statedump");
4270 if (session
->ust_session
) {
4271 ret
= ust_app_regenerate_statedump_all(session
->ust_session
);
4273 * Currently, the statedump in UST always returns 0.
4276 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4277 ERR("Failed to regenerate the UST statedump");
4281 DBG("Cmd regenerate statedump for session %s", session
->name
);
4288 int cmd_register_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4289 struct notification_thread_handle
*notification_thread
)
4293 ssize_t sock_recv_len
;
4294 struct lttng_trigger
*trigger
= NULL
;
4295 struct lttng_buffer_view view
;
4296 struct lttng_dynamic_buffer trigger_buffer
;
4298 lttng_dynamic_buffer_init(&trigger_buffer
);
4299 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4300 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4302 ret
= LTTNG_ERR_NOMEM
;
4306 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4308 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4309 ERR("Failed to receive \"register trigger\" command payload");
4310 /* TODO: should this be a new error enum ? */
4311 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4315 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4316 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4318 ERR("Invalid trigger payload received in \"register trigger\" command");
4319 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4323 ret
= notification_thread_command_register_trigger(notification_thread
,
4325 /* Ownership of trigger was transferred. */
4328 lttng_trigger_destroy(trigger
);
4329 lttng_dynamic_buffer_reset(&trigger_buffer
);
4333 int cmd_unregister_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4334 struct notification_thread_handle
*notification_thread
)
4338 ssize_t sock_recv_len
;
4339 struct lttng_trigger
*trigger
= NULL
;
4340 struct lttng_buffer_view view
;
4341 struct lttng_dynamic_buffer trigger_buffer
;
4343 lttng_dynamic_buffer_init(&trigger_buffer
);
4344 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4345 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4347 ret
= LTTNG_ERR_NOMEM
;
4351 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4353 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4354 ERR("Failed to receive \"unregister trigger\" command payload");
4355 /* TODO: should this be a new error enum ? */
4356 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4360 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4361 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4363 ERR("Invalid trigger payload received in \"unregister trigger\" command");
4364 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4368 ret
= notification_thread_command_unregister_trigger(notification_thread
,
4371 lttng_trigger_destroy(trigger
);
4372 lttng_dynamic_buffer_reset(&trigger_buffer
);
4377 * Send relayd sockets from snapshot output to consumer. Ignore request if the
4378 * snapshot output is *not* set with a remote destination.
4380 * Return LTTNG_OK on success or a LTTNG_ERR code.
4382 static enum lttng_error_code
set_relayd_for_snapshot(
4383 struct consumer_output
*output
,
4384 const struct ltt_session
*session
)
4386 enum lttng_error_code status
= LTTNG_OK
;
4387 struct lttng_ht_iter iter
;
4388 struct consumer_socket
*socket
;
4389 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
4390 const char *base_path
;
4395 DBG2("Set relayd object from snapshot output");
4397 if (session
->current_trace_chunk
) {
4398 enum lttng_trace_chunk_status chunk_status
=
4399 lttng_trace_chunk_get_id(
4400 session
->current_trace_chunk
,
4401 ¤t_chunk_id
.value
);
4403 if (chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
4404 current_chunk_id
.is_set
= true;
4406 ERR("Failed to get current trace chunk id");
4407 status
= LTTNG_ERR_UNK
;
4412 /* Ignore if snapshot consumer output is not network. */
4413 if (output
->type
!= CONSUMER_DST_NET
) {
4418 * The snapshot record URI base path overrides the session
4421 if (output
->dst
.net
.control
.subdir
[0] != '\0') {
4422 base_path
= output
->dst
.net
.control
.subdir
;
4424 base_path
= session
->base_path
;
4428 * For each consumer socket, create and send the relayd object of the
4432 cds_lfht_for_each_entry(output
->socks
->ht
, &iter
.iter
,
4433 socket
, node
.node
) {
4434 pthread_mutex_lock(socket
->lock
);
4435 status
= send_consumer_relayd_sockets(0, session
->id
,
4437 session
->name
, session
->hostname
,
4439 session
->live_timer
,
4440 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
4441 session
->creation_time
,
4442 session
->name_contains_creation_time
);
4443 pthread_mutex_unlock(socket
->lock
);
4444 if (status
!= LTTNG_OK
) {
4456 * Record a kernel snapshot.
4458 * Return LTTNG_OK on success or a LTTNG_ERR code.
4460 static enum lttng_error_code
record_kernel_snapshot(
4461 struct ltt_kernel_session
*ksess
,
4462 const struct consumer_output
*output
,
4463 const struct ltt_session
*session
,
4464 int wait
, uint64_t nb_packets_per_stream
)
4466 enum lttng_error_code status
;
4472 status
= kernel_snapshot_record(
4473 ksess
, output
, wait
, nb_packets_per_stream
);
4478 * Record a UST snapshot.
4480 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
4482 static enum lttng_error_code
record_ust_snapshot(struct ltt_ust_session
*usess
,
4483 const struct consumer_output
*output
,
4484 const struct ltt_session
*session
,
4485 int wait
, uint64_t nb_packets_per_stream
)
4487 enum lttng_error_code status
;
4493 status
= ust_app_snapshot_record(
4494 usess
, output
, wait
, nb_packets_per_stream
);
4499 uint64_t get_session_size_one_more_packet_per_stream(
4500 const struct ltt_session
*session
, uint64_t cur_nr_packets
)
4502 uint64_t tot_size
= 0;
4504 if (session
->kernel_session
) {
4505 struct ltt_kernel_channel
*chan
;
4506 const struct ltt_kernel_session
*ksess
=
4507 session
->kernel_session
;
4509 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
4510 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
4512 * Don't take channel into account if we
4513 * already grab all its packets.
4517 tot_size
+= chan
->channel
->attr
.subbuf_size
4518 * chan
->stream_count
;
4522 if (session
->ust_session
) {
4523 const struct ltt_ust_session
*usess
= session
->ust_session
;
4525 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
4533 * Calculate the number of packets we can grab from each stream that
4534 * fits within the overall snapshot max size.
4536 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
4537 * the number of packets per stream.
4539 * TODO: this approach is not perfect: we consider the worse case
4540 * (packet filling the sub-buffers) as an upper bound, but we could do
4541 * better if we do this calculation while we actually grab the packet
4542 * content: we would know how much padding we don't actually store into
4545 * This algorithm is currently bounded by the number of packets per
4548 * Since we call this algorithm before actually grabbing the data, it's
4549 * an approximation: for instance, applications could appear/disappear
4550 * in between this call and actually grabbing data.
4553 int64_t get_session_nb_packets_per_stream(const struct ltt_session
*session
,
4557 uint64_t cur_nb_packets
= 0;
4560 return 0; /* Infinite */
4563 size_left
= max_size
;
4565 uint64_t one_more_packet_tot_size
;
4567 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(
4568 session
, cur_nb_packets
);
4569 if (!one_more_packet_tot_size
) {
4570 /* We are already grabbing all packets. */
4573 size_left
-= one_more_packet_tot_size
;
4574 if (size_left
< 0) {
4579 if (!cur_nb_packets
) {
4580 /* Not enough room to grab one packet of each stream, error. */
4583 return cur_nb_packets
;
4587 enum lttng_error_code
snapshot_record(struct ltt_session
*session
,
4588 const struct snapshot_output
*snapshot_output
, int wait
)
4590 int64_t nb_packets_per_stream
;
4591 char snapshot_chunk_name
[LTTNG_NAME_MAX
];
4593 enum lttng_error_code ret_code
= LTTNG_OK
;
4594 struct lttng_trace_chunk
*snapshot_trace_chunk
;
4595 struct consumer_output
*original_ust_consumer_output
= NULL
;
4596 struct consumer_output
*original_kernel_consumer_output
= NULL
;
4597 struct consumer_output
*snapshot_ust_consumer_output
= NULL
;
4598 struct consumer_output
*snapshot_kernel_consumer_output
= NULL
;
4600 ret
= snprintf(snapshot_chunk_name
, sizeof(snapshot_chunk_name
),
4602 snapshot_output
->name
,
4603 snapshot_output
->datetime
,
4604 snapshot_output
->nb_snapshot
);
4605 if (ret
< 0 || ret
>= sizeof(snapshot_chunk_name
)) {
4606 ERR("Failed to format snapshot name");
4607 ret_code
= LTTNG_ERR_INVALID
;
4610 DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"",
4611 snapshot_output
->name
, session
->name
,
4612 snapshot_chunk_name
);
4613 if (!session
->kernel_session
&& !session
->ust_session
) {
4614 ERR("Failed to record snapshot as no channels exist");
4615 ret_code
= LTTNG_ERR_NO_CHANNEL
;
4619 if (session
->kernel_session
) {
4620 original_kernel_consumer_output
=
4621 session
->kernel_session
->consumer
;
4622 snapshot_kernel_consumer_output
=
4623 consumer_copy_output(snapshot_output
->consumer
);
4624 strcpy(snapshot_kernel_consumer_output
->chunk_path
,
4625 snapshot_chunk_name
);
4626 ret
= consumer_copy_sockets(snapshot_kernel_consumer_output
,
4627 original_kernel_consumer_output
);
4629 ERR("Failed to copy consumer sockets from snapshot output configuration");
4630 ret_code
= LTTNG_ERR_NOMEM
;
4633 ret_code
= set_relayd_for_snapshot(
4634 snapshot_kernel_consumer_output
, session
);
4635 if (ret_code
!= LTTNG_OK
) {
4636 ERR("Failed to setup relay daemon for kernel tracer snapshot");
4639 session
->kernel_session
->consumer
=
4640 snapshot_kernel_consumer_output
;
4642 if (session
->ust_session
) {
4643 original_ust_consumer_output
= session
->ust_session
->consumer
;
4644 snapshot_ust_consumer_output
=
4645 consumer_copy_output(snapshot_output
->consumer
);
4646 strcpy(snapshot_ust_consumer_output
->chunk_path
,
4647 snapshot_chunk_name
);
4648 ret
= consumer_copy_sockets(snapshot_ust_consumer_output
,
4649 original_ust_consumer_output
);
4651 ERR("Failed to copy consumer sockets from snapshot output configuration");
4652 ret_code
= LTTNG_ERR_NOMEM
;
4655 ret_code
= set_relayd_for_snapshot(
4656 snapshot_ust_consumer_output
, session
);
4657 if (ret_code
!= LTTNG_OK
) {
4658 ERR("Failed to setup relay daemon for userspace tracer snapshot");
4661 session
->ust_session
->consumer
=
4662 snapshot_ust_consumer_output
;
4665 snapshot_trace_chunk
= session_create_new_trace_chunk(session
,
4666 snapshot_kernel_consumer_output
?:
4667 snapshot_ust_consumer_output
,
4668 consumer_output_get_base_path(
4669 snapshot_output
->consumer
),
4670 snapshot_chunk_name
);
4671 if (!snapshot_trace_chunk
) {
4672 ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"",
4674 ret_code
= LTTNG_ERR_CREATE_DIR_FAIL
;
4677 assert(!session
->current_trace_chunk
);
4678 ret
= session_set_trace_chunk(session
, snapshot_trace_chunk
, NULL
);
4679 lttng_trace_chunk_put(snapshot_trace_chunk
);
4680 snapshot_trace_chunk
= NULL
;
4682 ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"",
4684 ret_code
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4688 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
4689 snapshot_output
->max_size
);
4690 if (nb_packets_per_stream
< 0) {
4691 ret_code
= LTTNG_ERR_MAX_SIZE_INVALID
;
4695 if (session
->kernel_session
) {
4696 ret_code
= record_kernel_snapshot(session
->kernel_session
,
4697 snapshot_kernel_consumer_output
, session
,
4698 wait
, nb_packets_per_stream
);
4699 if (ret_code
!= LTTNG_OK
) {
4704 if (session
->ust_session
) {
4705 ret_code
= record_ust_snapshot(session
->ust_session
,
4706 snapshot_ust_consumer_output
, session
,
4707 wait
, nb_packets_per_stream
);
4708 if (ret_code
!= LTTNG_OK
) {
4713 if (session_close_trace_chunk(session
, session
->current_trace_chunk
,
4714 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
, NULL
)) {
4716 * Don't goto end; make sure the chunk is closed for the session
4717 * to allow future snapshots.
4719 ERR("Failed to close snapshot trace chunk of session \"%s\"",
4721 ret_code
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
4723 if (session_set_trace_chunk(session
, NULL
, NULL
)) {
4724 ERR("Failed to release the current trace chunk of session \"%s\"",
4726 ret_code
= LTTNG_ERR_UNK
;
4729 if (original_ust_consumer_output
) {
4730 session
->ust_session
->consumer
= original_ust_consumer_output
;
4732 if (original_kernel_consumer_output
) {
4733 session
->kernel_session
->consumer
=
4734 original_kernel_consumer_output
;
4736 consumer_output_put(snapshot_ust_consumer_output
);
4737 consumer_output_put(snapshot_kernel_consumer_output
);
4742 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
4744 * The wait parameter is ignored so this call always wait for the snapshot to
4745 * complete before returning.
4747 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4749 int cmd_snapshot_record(struct ltt_session
*session
,
4750 const struct lttng_snapshot_output
*output
, int wait
)
4752 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4754 unsigned int snapshot_success
= 0;
4756 struct snapshot_output
*tmp_output
= NULL
;
4761 DBG("Cmd snapshot record for session %s", session
->name
);
4763 /* Get the datetime for the snapshot output directory. */
4764 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", datetime
,
4767 cmd_ret
= LTTNG_ERR_INVALID
;
4772 * Permission denied to create an output if the session is not
4773 * set in no output mode.
4775 if (session
->output_traces
) {
4776 cmd_ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
4780 /* The session needs to be started at least once. */
4781 if (!session
->has_been_started
) {
4782 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4786 /* Use temporary output for the session. */
4787 if (*output
->ctrl_url
!= '\0') {
4788 tmp_output
= snapshot_output_alloc();
4790 cmd_ret
= LTTNG_ERR_NOMEM
;
4794 ret
= snapshot_output_init(session
, output
->max_size
,
4796 output
->ctrl_url
, output
->data_url
,
4800 if (ret
== -ENOMEM
) {
4801 cmd_ret
= LTTNG_ERR_NOMEM
;
4803 cmd_ret
= LTTNG_ERR_INVALID
;
4807 /* Use the global session count for the temporary snapshot. */
4808 tmp_output
->nb_snapshot
= session
->snapshot
.nb_snapshot
;
4810 /* Use the global datetime */
4811 memcpy(tmp_output
->datetime
, datetime
, sizeof(datetime
));
4812 cmd_ret
= snapshot_record(session
, tmp_output
, wait
);
4813 if (cmd_ret
!= LTTNG_OK
) {
4816 snapshot_success
= 1;
4818 struct snapshot_output
*sout
;
4819 struct lttng_ht_iter iter
;
4822 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
4823 &iter
.iter
, sout
, node
.node
) {
4824 struct snapshot_output output_copy
;
4827 * Make a local copy of the output and override output
4828 * parameters with those provided as part of the
4831 memcpy(&output_copy
, sout
, sizeof(output_copy
));
4833 if (output
->max_size
!= (uint64_t) -1ULL) {
4834 output_copy
.max_size
= output
->max_size
;
4837 output_copy
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
4838 memcpy(output_copy
.datetime
, datetime
,
4841 /* Use temporary name. */
4842 if (*output
->name
!= '\0') {
4843 if (lttng_strncpy(output_copy
.name
,
4845 sizeof(output_copy
.name
))) {
4846 cmd_ret
= LTTNG_ERR_INVALID
;
4852 cmd_ret
= snapshot_record(session
, &output_copy
, wait
);
4853 if (cmd_ret
!= LTTNG_OK
) {
4857 snapshot_success
= 1;
4862 if (snapshot_success
) {
4863 session
->snapshot
.nb_snapshot
++;
4865 cmd_ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
4870 snapshot_output_destroy(tmp_output
);
4876 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
4878 int cmd_set_session_shm_path(struct ltt_session
*session
,
4879 const char *shm_path
)
4885 * Can only set shm path before session is started.
4887 if (session
->has_been_started
) {
4888 return LTTNG_ERR_SESSION_STARTED
;
4891 strncpy(session
->shm_path
, shm_path
,
4892 sizeof(session
->shm_path
));
4893 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
4899 * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
4901 * Ask the consumer to rotate the session output directory.
4902 * The session lock must be held.
4904 * Returns LTTNG_OK on success or else a negative LTTng error code.
4906 int cmd_rotate_session(struct ltt_session
*session
,
4907 struct lttng_rotate_session_return
*rotate_return
,
4908 bool quiet_rotation
,
4909 enum lttng_trace_chunk_command_type command
)
4912 uint64_t ongoing_rotation_chunk_id
;
4913 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4914 struct lttng_trace_chunk
*chunk_being_archived
= NULL
;
4915 struct lttng_trace_chunk
*new_trace_chunk
= NULL
;
4916 enum lttng_trace_chunk_status chunk_status
;
4917 bool failed_to_rotate
= false;
4918 enum lttng_error_code rotation_fail_code
= LTTNG_OK
;
4922 if (!session
->has_been_started
) {
4923 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4928 * Explicit rotation is not supported for live sessions.
4929 * However, live sessions can perform a quiet rotation on
4931 * Rotation is not supported for snapshot traces (no output).
4933 if ((!quiet_rotation
&& session
->live_timer
) ||
4934 !session
->output_traces
) {
4935 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
4939 /* Unsupported feature in lttng-relayd before 2.11. */
4940 if (!quiet_rotation
&& session
->consumer
->type
== CONSUMER_DST_NET
&&
4941 (session
->consumer
->relay_major_version
== 2 &&
4942 session
->consumer
->relay_minor_version
< 11)) {
4943 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY
;
4947 /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */
4948 if (session
->kernel_session
&& !kernel_supports_ring_buffer_packet_sequence_number()) {
4949 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL
;
4953 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
4954 DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
4956 cmd_ret
= LTTNG_ERR_ROTATION_PENDING
;
4961 * After a stop, we only allow one rotation to occur, the other ones are
4962 * useless until a new start.
4964 if (session
->rotated_after_last_stop
) {
4965 DBG("Session \"%s\" was already rotated after stop, refusing rotation",
4967 cmd_ret
= LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP
;
4970 if (session
->active
) {
4971 new_trace_chunk
= session_create_new_trace_chunk(session
, NULL
,
4973 if (!new_trace_chunk
) {
4974 cmd_ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
4980 * The current trace chunk becomes the chunk being archived.
4982 * After this point, "chunk_being_archived" must absolutely
4983 * be closed on the consumer(s), otherwise it will never be
4984 * cleaned-up, which will result in a leak.
4986 ret
= session_set_trace_chunk(session
, new_trace_chunk
,
4987 &chunk_being_archived
);
4989 cmd_ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4993 if (session
->kernel_session
) {
4994 cmd_ret
= kernel_rotate_session(session
);
4995 if (cmd_ret
!= LTTNG_OK
) {
4996 failed_to_rotate
= true;
4997 rotation_fail_code
= cmd_ret
;
5000 if (session
->ust_session
) {
5001 cmd_ret
= ust_app_rotate_session(session
);
5002 if (cmd_ret
!= LTTNG_OK
) {
5003 failed_to_rotate
= true;
5004 rotation_fail_code
= cmd_ret
;
5008 if (!session
->active
) {
5009 session
->rotated_after_last_stop
= true;
5012 if (!chunk_being_archived
) {
5013 DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check",
5015 if (failed_to_rotate
) {
5016 cmd_ret
= rotation_fail_code
;
5023 session
->rotation_state
= LTTNG_ROTATION_STATE_ONGOING
;
5024 chunk_status
= lttng_trace_chunk_get_id(chunk_being_archived
,
5025 &ongoing_rotation_chunk_id
);
5026 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
5028 ret
= session_close_trace_chunk(session
, chunk_being_archived
,
5029 command
, session
->last_chunk_path
);
5031 cmd_ret
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
5035 if (failed_to_rotate
) {
5036 cmd_ret
= rotation_fail_code
;
5040 session
->quiet_rotation
= quiet_rotation
;
5041 ret
= timer_session_rotation_pending_check_start(session
,
5042 DEFAULT_ROTATE_PENDING_TIMER
);
5044 cmd_ret
= LTTNG_ERR_UNK
;
5048 if (rotate_return
) {
5049 rotate_return
->rotation_id
= ongoing_rotation_chunk_id
;
5052 session
->chunk_being_archived
= chunk_being_archived
;
5053 chunk_being_archived
= NULL
;
5054 if (!quiet_rotation
) {
5055 ret
= notification_thread_command_session_rotation_ongoing(
5056 notification_thread_handle
,
5057 session
->name
, session
->uid
, session
->gid
,
5058 ongoing_rotation_chunk_id
);
5059 if (ret
!= LTTNG_OK
) {
5060 ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
5066 DBG("Cmd rotate session %s, archive_id %" PRIu64
" sent",
5067 session
->name
, ongoing_rotation_chunk_id
);
5069 lttng_trace_chunk_put(new_trace_chunk
);
5070 lttng_trace_chunk_put(chunk_being_archived
);
5071 ret
= (cmd_ret
== LTTNG_OK
) ? cmd_ret
: -((int) cmd_ret
);
5074 if (session_reset_rotation_state(session
,
5075 LTTNG_ROTATION_STATE_ERROR
)) {
5076 ERR("Failed to reset rotation state of session \"%s\"",
5083 * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
5085 * Check if the session has finished its rotation.
5087 * Return LTTNG_OK on success or else an LTTNG_ERR code.
5089 int cmd_rotate_get_info(struct ltt_session
*session
,
5090 struct lttng_rotation_get_info_return
*info_return
,
5091 uint64_t rotation_id
)
5093 enum lttng_error_code cmd_ret
= LTTNG_OK
;
5094 enum lttng_rotation_state rotation_state
;
5096 DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64
, session
->name
,
5097 session
->most_recent_chunk_id
.value
);
5099 if (session
->chunk_being_archived
) {
5100 enum lttng_trace_chunk_status chunk_status
;
5103 chunk_status
= lttng_trace_chunk_get_id(
5104 session
->chunk_being_archived
,
5106 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
5108 rotation_state
= rotation_id
== chunk_id
?
5109 LTTNG_ROTATION_STATE_ONGOING
:
5110 LTTNG_ROTATION_STATE_EXPIRED
;
5112 if (session
->last_archived_chunk_id
.is_set
&&
5113 rotation_id
!= session
->last_archived_chunk_id
.value
) {
5114 rotation_state
= LTTNG_ROTATION_STATE_EXPIRED
;
5116 rotation_state
= session
->rotation_state
;
5120 switch (rotation_state
) {
5121 case LTTNG_ROTATION_STATE_NO_ROTATION
:
5122 DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"",
5125 case LTTNG_ROTATION_STATE_EXPIRED
:
5126 DBG("Reporting that the rotation state of rotation id %" PRIu64
" of session \"%s\" has expired",
5127 rotation_id
, session
->name
);
5129 case LTTNG_ROTATION_STATE_ONGOING
:
5130 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is still pending",
5131 rotation_id
, session
->name
);
5133 case LTTNG_ROTATION_STATE_COMPLETED
:
5137 char *current_tracing_path_reply
;
5138 size_t current_tracing_path_reply_len
;
5140 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is completed",
5141 rotation_id
, session
->name
);
5143 switch (session_get_consumer_destination_type(session
)) {
5144 case CONSUMER_DST_LOCAL
:
5145 current_tracing_path_reply
=
5146 info_return
->location
.local
.absolute_path
;
5147 current_tracing_path_reply_len
=
5148 sizeof(info_return
->location
.local
.absolute_path
);
5149 info_return
->location_type
=
5150 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL
;
5151 fmt_ret
= asprintf(&chunk_path
,
5152 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
"/%s",
5153 session_get_base_path(session
),
5154 session
->last_archived_chunk_name
);
5155 if (fmt_ret
== -1) {
5156 PERROR("Failed to format the path of the last archived trace chunk");
5157 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5158 cmd_ret
= LTTNG_ERR_UNK
;
5162 case CONSUMER_DST_NET
:
5164 uint16_t ctrl_port
, data_port
;
5166 current_tracing_path_reply
=
5167 info_return
->location
.relay
.relative_path
;
5168 current_tracing_path_reply_len
=
5169 sizeof(info_return
->location
.relay
.relative_path
);
5170 /* Currently the only supported relay protocol. */
5171 info_return
->location
.relay
.protocol
=
5172 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP
;
5174 fmt_ret
= lttng_strncpy(info_return
->location
.relay
.host
,
5175 session_get_net_consumer_hostname(session
),
5176 sizeof(info_return
->location
.relay
.host
));
5178 ERR("Failed to copy host name to rotate_get_info reply");
5179 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5180 cmd_ret
= LTTNG_ERR_SET_URL
;
5184 session_get_net_consumer_ports(session
, &ctrl_port
, &data_port
);
5185 info_return
->location
.relay
.ports
.control
= ctrl_port
;
5186 info_return
->location
.relay
.ports
.data
= data_port
;
5187 info_return
->location_type
=
5188 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY
;
5189 chunk_path
= strdup(session
->last_chunk_path
);
5191 ERR("Failed to allocate the path of the last archived trace chunk");
5192 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5193 cmd_ret
= LTTNG_ERR_UNK
;
5202 fmt_ret
= lttng_strncpy(current_tracing_path_reply
,
5203 chunk_path
, current_tracing_path_reply_len
);
5206 ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply");
5207 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5208 cmd_ret
= LTTNG_ERR_UNK
;
5214 case LTTNG_ROTATION_STATE_ERROR
:
5215 DBG("Reporting that an error occurred during rotation %" PRIu64
" of session \"%s\"",
5216 rotation_id
, session
->name
);
5224 info_return
->status
= (int32_t) rotation_state
;
5229 * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
5231 * Configure the automatic rotation parameters.
5232 * 'activate' to true means activate the rotation schedule type with 'new_value'.
5233 * 'activate' to false means deactivate the rotation schedule and validate that
5234 * 'new_value' has the same value as the currently active value.
5236 * Return 0 on success or else a positive LTTNG_ERR code.
5238 int cmd_rotation_set_schedule(struct ltt_session
*session
,
5239 bool activate
, enum lttng_rotation_schedule_type schedule_type
,
5241 struct notification_thread_handle
*notification_thread_handle
)
5244 uint64_t *parameter_value
;
5248 DBG("Cmd rotate set schedule session %s", session
->name
);
5250 if (session
->live_timer
|| !session
->output_traces
) {
5251 DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
5252 ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
5256 switch (schedule_type
) {
5257 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5258 parameter_value
= &session
->rotate_size
;
5260 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5261 parameter_value
= &session
->rotate_timer_period
;
5262 if (new_value
>= UINT_MAX
) {
5263 DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64
" > %u (UINT_MAX)",
5264 new_value
, UINT_MAX
);
5265 ret
= LTTNG_ERR_INVALID
;
5270 WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
5271 ret
= LTTNG_ERR_INVALID
;
5275 /* Improper use of the API. */
5276 if (new_value
== -1ULL) {
5277 WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
5278 ret
= LTTNG_ERR_INVALID
;
5283 * As indicated in struct ltt_session's comments, a value of == 0 means
5284 * this schedule rotation type is not in use.
5286 * Reject the command if we were asked to activate a schedule that was
5289 if (activate
&& *parameter_value
!= 0) {
5290 DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
5291 ret
= LTTNG_ERR_ROTATION_SCHEDULE_SET
;
5296 * Reject the command if we were asked to deactivate a schedule that was
5299 if (!activate
&& *parameter_value
== 0) {
5300 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
5301 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5306 * Reject the command if we were asked to deactivate a schedule that
5309 if (!activate
&& *parameter_value
!= new_value
) {
5310 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
5311 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5315 *parameter_value
= activate
? new_value
: 0;
5317 switch (schedule_type
) {
5318 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5319 if (activate
&& session
->active
) {
5321 * Only start the timer if the session is active,
5322 * otherwise it will be started when the session starts.
5324 ret
= timer_session_rotation_schedule_timer_start(
5325 session
, new_value
);
5327 ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
5328 ret
= LTTNG_ERR_UNK
;
5332 ret
= timer_session_rotation_schedule_timer_stop(
5335 ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
5336 ret
= LTTNG_ERR_UNK
;
5341 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5343 ret
= subscribe_session_consumed_size_rotation(session
,
5344 new_value
, notification_thread_handle
);
5346 ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
5347 ret
= LTTNG_ERR_UNK
;
5351 ret
= unsubscribe_session_consumed_size_rotation(session
,
5352 notification_thread_handle
);
5354 ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
5355 ret
= LTTNG_ERR_UNK
;
5362 /* Would have been caught before. */
5374 /* Wait for a given path to be removed before continuing. */
5375 static enum lttng_error_code
wait_on_path(void *path_data
)
5377 const char *shm_path
= path_data
;
5379 DBG("Waiting for the shm path at %s to be removed before completing session destruction",
5385 ret
= stat(shm_path
, &st
);
5387 if (errno
!= ENOENT
) {
5388 PERROR("stat() returned an error while checking for the existence of the shm path");
5390 DBG("shm path no longer exists, completing the destruction of session");
5394 if (!S_ISDIR(st
.st_mode
)) {
5395 ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
5400 usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US
);
5406 * Returns a pointer to a handler to run on completion of a command.
5407 * Returns NULL if no handler has to be run for the last command executed.
5409 const struct cmd_completion_handler
*cmd_pop_completion_handler(void)
5411 struct cmd_completion_handler
*handler
= current_completion_handler
;
5413 current_completion_handler
= NULL
;
5418 * Init command subsystem.
5423 * Set network sequence index to 1 for streams to match a relayd
5424 * socket on the consumer side.
5426 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
5427 relayd_net_seq_idx
= 1;
5428 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
5430 DBG("Command subsystem initialized");