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
;
78 static enum lttng_error_code
wait_on_path(void *path
);
81 * Command completion handler that is used by the destroy command
82 * when a session that has a non-default shm_path is being destroyed.
84 * See comment in cmd_destroy_session() for the rationale.
86 static struct destroy_completion_handler
{
87 struct cmd_completion_handler handler
;
88 char shm_path
[member_sizeof(struct ltt_session
, shm_path
)];
89 } destroy_completion_handler
= {
92 .data
= destroy_completion_handler
.shm_path
97 static struct cmd_completion_handler
*current_completion_handler
;
100 * Used to keep a unique index for each relayd socket created where this value
101 * is associated with streams on the consumer so it can match the right relayd
102 * to send to. It must be accessed with the relayd_net_seq_idx_lock
105 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
106 static uint64_t relayd_net_seq_idx
;
108 static int validate_ust_event_name(const char *);
109 static int cmd_enable_event_internal(struct ltt_session
*session
,
110 struct lttng_domain
*domain
,
111 char *channel_name
, struct lttng_event
*event
,
112 char *filter_expression
,
113 struct lttng_filter_bytecode
*filter
,
114 struct lttng_event_exclusion
*exclusion
,
118 * Create a session path used by list_lttng_sessions for the case that the
119 * session consumer is on the network.
121 static int build_network_session_path(char *dst
, size_t size
,
122 struct ltt_session
*session
)
124 int ret
, kdata_port
, udata_port
;
125 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
126 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
131 memset(tmp_urls
, 0, sizeof(tmp_urls
));
132 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
134 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
136 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
137 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
138 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
141 if (session
->ust_session
&& session
->ust_session
->consumer
) {
142 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
143 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
146 if (uuri
== NULL
&& kuri
== NULL
) {
147 uri
= &session
->consumer
->dst
.net
.control
;
148 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
149 } else if (kuri
&& uuri
) {
150 ret
= uri_compare(kuri
, uuri
);
154 /* Build uuri URL string */
155 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
162 } else if (kuri
&& uuri
== NULL
) {
164 } else if (uuri
&& kuri
== NULL
) {
168 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
174 * Do we have a UST url set. If yes, this means we have both kernel and UST
177 if (*tmp_uurl
!= '\0') {
178 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
179 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
182 if (kuri
|| (!kuri
&& !uuri
)) {
185 /* No kernel URI, use the UST port. */
188 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
196 * Get run-time attributes if the session has been started (discarded events,
199 static int get_kernel_runtime_stats(struct ltt_session
*session
,
200 struct ltt_kernel_channel
*kchan
, uint64_t *discarded_events
,
201 uint64_t *lost_packets
)
205 if (!session
->has_been_started
) {
207 *discarded_events
= 0;
212 ret
= consumer_get_discarded_events(session
->id
, kchan
->key
,
213 session
->kernel_session
->consumer
,
219 ret
= consumer_get_lost_packets(session
->id
, kchan
->key
,
220 session
->kernel_session
->consumer
,
231 * Get run-time attributes if the session has been started (discarded events,
234 static int get_ust_runtime_stats(struct ltt_session
*session
,
235 struct ltt_ust_channel
*uchan
, uint64_t *discarded_events
,
236 uint64_t *lost_packets
)
239 struct ltt_ust_session
*usess
;
241 if (!discarded_events
|| !lost_packets
) {
246 usess
= session
->ust_session
;
247 assert(discarded_events
);
248 assert(lost_packets
);
250 if (!usess
|| !session
->has_been_started
) {
251 *discarded_events
= 0;
257 if (usess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
258 ret
= ust_app_uid_get_channel_runtime_stats(usess
->id
,
259 &usess
->buffer_reg_uid_list
,
260 usess
->consumer
, uchan
->id
,
261 uchan
->attr
.overwrite
,
264 } else if (usess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
265 ret
= ust_app_pid_get_channel_runtime_stats(usess
,
266 uchan
, usess
->consumer
,
267 uchan
->attr
.overwrite
,
273 *discarded_events
+= uchan
->per_pid_closed_app_discarded
;
274 *lost_packets
+= uchan
->per_pid_closed_app_lost
;
276 ERR("Unsupported buffer type");
287 * Fill lttng_channel array of all channels.
289 static ssize_t
list_lttng_channels(enum lttng_domain_type domain
,
290 struct ltt_session
*session
, struct lttng_channel
*channels
,
291 struct lttng_channel_extended
*chan_exts
)
294 struct ltt_kernel_channel
*kchan
;
296 DBG("Listing channels for session %s", session
->name
);
299 case LTTNG_DOMAIN_KERNEL
:
300 /* Kernel channels */
301 if (session
->kernel_session
!= NULL
) {
302 cds_list_for_each_entry(kchan
,
303 &session
->kernel_session
->channel_list
.head
, list
) {
304 uint64_t discarded_events
, lost_packets
;
305 struct lttng_channel_extended
*extended
;
307 extended
= (struct lttng_channel_extended
*)
308 kchan
->channel
->attr
.extended
.ptr
;
310 ret
= get_kernel_runtime_stats(session
, kchan
,
311 &discarded_events
, &lost_packets
);
315 /* Copy lttng_channel struct to array */
316 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
317 channels
[i
].enabled
= kchan
->enabled
;
318 chan_exts
[i
].discarded_events
=
320 chan_exts
[i
].lost_packets
= lost_packets
;
321 chan_exts
[i
].monitor_timer_interval
=
322 extended
->monitor_timer_interval
;
323 chan_exts
[i
].blocking_timeout
= 0;
328 case LTTNG_DOMAIN_UST
:
330 struct lttng_ht_iter iter
;
331 struct ltt_ust_channel
*uchan
;
334 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
335 &iter
.iter
, uchan
, node
.node
) {
336 uint64_t discarded_events
= 0, lost_packets
= 0;
338 if (lttng_strncpy(channels
[i
].name
, uchan
->name
,
339 LTTNG_SYMBOL_NAME_LEN
)) {
342 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
343 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
344 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
345 channels
[i
].attr
.switch_timer_interval
=
346 uchan
->attr
.switch_timer_interval
;
347 channels
[i
].attr
.read_timer_interval
=
348 uchan
->attr
.read_timer_interval
;
349 channels
[i
].enabled
= uchan
->enabled
;
350 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
351 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
354 * Map enum lttng_ust_output to enum lttng_event_output.
356 switch (uchan
->attr
.output
) {
358 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
362 * LTTNG_UST_MMAP is the only supported UST
369 chan_exts
[i
].monitor_timer_interval
=
370 uchan
->monitor_timer_interval
;
371 chan_exts
[i
].blocking_timeout
=
372 uchan
->attr
.u
.s
.blocking_timeout
;
374 ret
= get_ust_runtime_stats(session
, uchan
,
375 &discarded_events
, &lost_packets
);
379 chan_exts
[i
].discarded_events
= discarded_events
;
380 chan_exts
[i
].lost_packets
= lost_packets
;
392 return -LTTNG_ERR_FATAL
;
398 static int increment_extended_len(const char *filter_expression
,
399 struct lttng_event_exclusion
*exclusion
,
400 const struct lttng_userspace_probe_location
*probe_location
,
401 size_t *extended_len
)
405 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
407 if (filter_expression
) {
408 *extended_len
+= strlen(filter_expression
) + 1;
412 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
415 if (probe_location
) {
416 ret
= lttng_userspace_probe_location_serialize(probe_location
,
421 *extended_len
+= ret
;
428 static int append_extended_info(const char *filter_expression
,
429 struct lttng_event_exclusion
*exclusion
,
430 struct lttng_userspace_probe_location
*probe_location
,
434 size_t filter_len
= 0;
435 size_t nb_exclusions
= 0;
436 size_t userspace_probe_location_len
= 0;
437 struct lttng_dynamic_buffer location_buffer
;
438 struct lttcomm_event_extended_header extended_header
;
440 if (filter_expression
) {
441 filter_len
= strlen(filter_expression
) + 1;
445 nb_exclusions
= exclusion
->count
;
448 if (probe_location
) {
449 lttng_dynamic_buffer_init(&location_buffer
);
450 ret
= lttng_userspace_probe_location_serialize(probe_location
,
451 &location_buffer
, NULL
);
456 userspace_probe_location_len
= location_buffer
.size
;
459 /* Set header fields */
460 extended_header
.filter_len
= filter_len
;
461 extended_header
.nb_exclusions
= nb_exclusions
;
462 extended_header
.userspace_probe_location_len
= userspace_probe_location_len
;
465 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
466 *extended_at
+= sizeof(extended_header
);
468 /* Copy filter string */
469 if (filter_expression
) {
470 memcpy(*extended_at
, filter_expression
, filter_len
);
471 *extended_at
+= filter_len
;
474 /* Copy exclusion names */
476 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
478 memcpy(*extended_at
, &exclusion
->names
, len
);
482 if (probe_location
) {
483 memcpy(*extended_at
, location_buffer
.data
, location_buffer
.size
);
484 *extended_at
+= location_buffer
.size
;
485 lttng_dynamic_buffer_reset(&location_buffer
);
493 * Create a list of agent domain events.
495 * Return number of events in list on success or else a negative value.
497 static int list_lttng_agent_events(struct agent
*agt
,
498 struct lttng_event
**events
, size_t *total_size
)
501 unsigned int nb_event
= 0;
502 struct agent_event
*event
;
503 struct lttng_event
*tmp_events
= NULL
;
504 struct lttng_ht_iter iter
;
505 size_t extended_len
= 0;
511 DBG3("Listing agent events");
514 nb_event
= lttng_ht_get_count(agt
->events
);
522 /* Compute required extended infos size */
523 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
526 * This is only valid because the commands which add events are
527 * processed in the same thread as the listing.
530 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
531 ret
= increment_extended_len(event
->filter_expression
, NULL
, NULL
,
534 DBG("Error computing the length of extended info message");
535 ret
= -LTTNG_ERR_FATAL
;
541 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
542 tmp_events
= zmalloc(*total_size
);
544 PERROR("zmalloc agent events session");
545 ret
= -LTTNG_ERR_FATAL
;
549 extended_at
= ((uint8_t *) tmp_events
) +
550 nb_event
* sizeof(struct lttng_event
);
553 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
554 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
555 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
556 tmp_events
[i
].enabled
= event
->enabled
;
557 tmp_events
[i
].loglevel
= event
->loglevel_value
;
558 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
561 /* Append extended info */
562 ret
= append_extended_info(event
->filter_expression
, NULL
, NULL
,
565 DBG("Error appending extended info message");
566 ret
= -LTTNG_ERR_FATAL
;
571 *events
= tmp_events
;
573 assert(nb_event
== i
);
584 * Create a list of ust global domain events.
586 static int list_lttng_ust_global_events(char *channel_name
,
587 struct ltt_ust_domain_global
*ust_global
,
588 struct lttng_event
**events
, size_t *total_size
)
591 unsigned int nb_event
= 0;
592 struct lttng_ht_iter iter
;
593 struct lttng_ht_node_str
*node
;
594 struct ltt_ust_channel
*uchan
;
595 struct ltt_ust_event
*uevent
;
596 struct lttng_event
*tmp
;
597 size_t extended_len
= 0;
600 DBG("Listing UST global events for channel %s", channel_name
);
604 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
605 node
= lttng_ht_iter_get_node_str(&iter
);
607 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
611 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
613 nb_event
= lttng_ht_get_count(uchan
->events
);
620 DBG3("Listing UST global %d events", nb_event
);
622 /* Compute required extended infos size */
623 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
624 if (uevent
->internal
) {
629 ret
= increment_extended_len(uevent
->filter_expression
,
630 uevent
->exclusion
, NULL
, &extended_len
);
632 DBG("Error computing the length of extended info message");
633 ret
= -LTTNG_ERR_FATAL
;
638 /* All events are internal, skip. */
644 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
645 tmp
= zmalloc(*total_size
);
647 ret
= -LTTNG_ERR_FATAL
;
651 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
653 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
654 if (uevent
->internal
) {
655 /* This event should remain hidden from clients */
658 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
659 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
660 tmp
[i
].enabled
= uevent
->enabled
;
662 switch (uevent
->attr
.instrumentation
) {
663 case LTTNG_UST_TRACEPOINT
:
664 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
666 case LTTNG_UST_PROBE
:
667 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
669 case LTTNG_UST_FUNCTION
:
670 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
674 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
675 switch (uevent
->attr
.loglevel_type
) {
676 case LTTNG_UST_LOGLEVEL_ALL
:
677 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
679 case LTTNG_UST_LOGLEVEL_RANGE
:
680 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
682 case LTTNG_UST_LOGLEVEL_SINGLE
:
683 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
686 if (uevent
->filter
) {
689 if (uevent
->exclusion
) {
690 tmp
[i
].exclusion
= 1;
694 /* Append extended info */
695 ret
= append_extended_info(uevent
->filter_expression
,
696 uevent
->exclusion
, NULL
, &extended_at
);
698 DBG("Error appending extended info message");
699 ret
= -LTTNG_ERR_FATAL
;
712 * Fill lttng_event array of all kernel events in the channel.
714 static int list_lttng_kernel_events(char *channel_name
,
715 struct ltt_kernel_session
*kernel_session
,
716 struct lttng_event
**events
, size_t *total_size
)
719 unsigned int nb_event
;
720 struct ltt_kernel_event
*event
;
721 struct ltt_kernel_channel
*kchan
;
722 size_t extended_len
= 0;
725 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
727 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
731 nb_event
= kchan
->event_count
;
733 DBG("Listing events for channel %s", kchan
->channel
->name
);
741 /* Compute required extended infos size */
742 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
743 ret
= increment_extended_len(event
->filter_expression
, NULL
,
744 event
->userspace_probe_location
,
747 DBG("Error computing the length of extended info message");
748 ret
= -LTTNG_ERR_FATAL
;
753 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
754 *events
= zmalloc(*total_size
);
755 if (*events
== NULL
) {
756 ret
= -LTTNG_ERR_FATAL
;
760 extended_at
= ((void *) *events
) +
761 nb_event
* sizeof(struct lttng_event
);
763 /* Kernel channels */
764 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
765 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
766 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
767 (*events
)[i
].enabled
= event
->enabled
;
768 (*events
)[i
].filter
=
769 (unsigned char) !!event
->filter_expression
;
771 switch (event
->event
->instrumentation
) {
772 case LTTNG_KERNEL_TRACEPOINT
:
773 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
775 case LTTNG_KERNEL_KRETPROBE
:
776 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
777 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
778 sizeof(struct lttng_kernel_kprobe
));
780 case LTTNG_KERNEL_KPROBE
:
781 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
782 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
783 sizeof(struct lttng_kernel_kprobe
));
785 case LTTNG_KERNEL_UPROBE
:
786 (*events
)[i
].type
= LTTNG_EVENT_USERSPACE_PROBE
;
788 case LTTNG_KERNEL_FUNCTION
:
789 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
790 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
791 sizeof(struct lttng_kernel_function
));
793 case LTTNG_KERNEL_NOOP
:
794 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
796 case LTTNG_KERNEL_SYSCALL
:
797 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
799 case LTTNG_KERNEL_ALL
:
807 /* Append extended info */
808 ret
= append_extended_info(event
->filter_expression
, NULL
,
809 event
->userspace_probe_location
, &extended_at
);
811 DBG("Error appending extended info message");
812 ret
= -LTTNG_ERR_FATAL
;
821 /* Negate the error code to differentiate the size from an error */
826 * Add URI so the consumer output object. Set the correct path depending on the
827 * domain adding the default trace directory.
829 static enum lttng_error_code
add_uri_to_consumer(
830 const struct ltt_session
*session
,
831 struct consumer_output
*consumer
,
832 struct lttng_uri
*uri
, enum lttng_domain_type domain
)
835 enum lttng_error_code ret_code
= LTTNG_OK
;
839 if (consumer
== NULL
) {
840 DBG("No consumer detected. Don't add URI. Stopping.");
841 ret_code
= LTTNG_ERR_NO_CONSUMER
;
846 case LTTNG_DOMAIN_KERNEL
:
847 ret
= lttng_strncpy(consumer
->domain_subdir
,
848 DEFAULT_KERNEL_TRACE_DIR
,
849 sizeof(consumer
->domain_subdir
));
851 case LTTNG_DOMAIN_UST
:
852 ret
= lttng_strncpy(consumer
->domain_subdir
,
853 DEFAULT_UST_TRACE_DIR
,
854 sizeof(consumer
->domain_subdir
));
858 * This case is possible is we try to add the URI to the global
859 * tracing session consumer object which in this case there is
862 memset(consumer
->domain_subdir
, 0,
863 sizeof(consumer
->domain_subdir
));
867 ERR("Failed to initialize consumer output domain subdirectory");
868 ret_code
= LTTNG_ERR_FATAL
;
872 switch (uri
->dtype
) {
875 DBG2("Setting network URI to consumer");
877 if (consumer
->type
== CONSUMER_DST_NET
) {
878 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
879 consumer
->dst
.net
.control_isset
) ||
880 (uri
->stype
== LTTNG_STREAM_DATA
&&
881 consumer
->dst
.net
.data_isset
)) {
882 ret_code
= LTTNG_ERR_URL_EXIST
;
886 memset(&consumer
->dst
, 0, sizeof(consumer
->dst
));
889 /* Set URI into consumer output object */
890 ret
= consumer_set_network_uri(session
, consumer
, uri
);
894 } else if (ret
== 1) {
896 * URI was the same in the consumer so we do not append the subdir
897 * again so to not duplicate output dir.
904 if (*uri
->dst
.path
!= '/' || strstr(uri
->dst
.path
, "../")) {
905 ret_code
= LTTNG_ERR_INVALID
;
908 DBG2("Setting trace directory path from URI to %s",
910 memset(&consumer
->dst
, 0, sizeof(consumer
->dst
));
912 ret
= lttng_strncpy(consumer
->dst
.session_root_path
,
914 sizeof(consumer
->dst
.session_root_path
));
915 consumer
->type
= CONSUMER_DST_LOCAL
;
925 * Init tracing by creating trace directory and sending fds kernel consumer.
927 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
930 struct lttng_ht_iter iter
;
931 struct consumer_socket
*socket
;
937 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
938 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
940 pthread_mutex_lock(socket
->lock
);
941 ret
= kernel_consumer_send_session(socket
, session
);
942 pthread_mutex_unlock(socket
->lock
);
944 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
956 * Create a socket to the relayd using the URI.
958 * On success, the relayd_sock pointer is set to the created socket.
959 * Else, it remains untouched and an LTTng error code is returned.
961 static enum lttng_error_code
create_connect_relayd(struct lttng_uri
*uri
,
962 struct lttcomm_relayd_sock
**relayd_sock
,
963 struct consumer_output
*consumer
)
966 enum lttng_error_code status
= LTTNG_OK
;
967 struct lttcomm_relayd_sock
*rsock
;
969 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
970 RELAYD_VERSION_COMM_MINOR
);
972 status
= LTTNG_ERR_FATAL
;
977 * Connect to relayd so we can proceed with a session creation. This call
978 * can possibly block for an arbitrary amount of time to set the health
979 * state to be in poll execution.
982 ret
= relayd_connect(rsock
);
985 ERR("Unable to reach lttng-relayd");
986 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
990 /* Create socket for control stream. */
991 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
992 DBG3("Creating relayd stream socket from URI");
994 /* Check relayd version */
995 ret
= relayd_version_check(rsock
);
996 if (ret
== LTTNG_ERR_RELAYD_VERSION_FAIL
) {
997 status
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
999 } else if (ret
< 0) {
1000 ERR("Unable to reach lttng-relayd");
1001 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
1004 consumer
->relay_major_version
= rsock
->major
;
1005 consumer
->relay_minor_version
= rsock
->minor
;
1006 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
1007 DBG3("Creating relayd data socket from URI");
1009 /* Command is not valid */
1010 ERR("Relayd invalid stream type: %d", uri
->stype
);
1011 status
= LTTNG_ERR_INVALID
;
1015 *relayd_sock
= rsock
;
1020 /* The returned value is not useful since we are on an error path. */
1021 (void) relayd_close(rsock
);
1029 * Connect to the relayd using URI and send the socket to the right consumer.
1031 * The consumer socket lock must be held by the caller.
1033 * Returns LTTNG_OK on success or an LTTng error code on failure.
1035 static enum lttng_error_code
send_consumer_relayd_socket(
1036 unsigned int session_id
,
1037 struct lttng_uri
*relayd_uri
,
1038 struct consumer_output
*consumer
,
1039 struct consumer_socket
*consumer_sock
,
1040 const char *session_name
, const char *hostname
,
1041 const char *base_path
, int session_live_timer
,
1042 const uint64_t *current_chunk_id
,
1043 time_t session_creation_time
)
1046 struct lttcomm_relayd_sock
*rsock
= NULL
;
1047 enum lttng_error_code status
;
1049 /* Connect to relayd and make version check if uri is the control. */
1050 status
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
1051 if (status
!= LTTNG_OK
) {
1052 goto relayd_comm_error
;
1056 /* Set the network sequence index if not set. */
1057 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
1058 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
1060 * Increment net_seq_idx because we are about to transfer the
1061 * new relayd socket to the consumer.
1062 * Assign unique key so the consumer can match streams.
1064 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
1065 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
1068 /* Send relayd socket to consumer. */
1069 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
1070 relayd_uri
->stype
, session_id
,
1071 session_name
, hostname
, base_path
,
1072 session_live_timer
, current_chunk_id
,
1073 session_creation_time
);
1075 status
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
1079 /* Flag that the corresponding socket was sent. */
1080 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
1081 consumer_sock
->control_sock_sent
= 1;
1082 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
1083 consumer_sock
->data_sock_sent
= 1;
1087 * Close socket which was dup on the consumer side. The session daemon does
1088 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1092 if (status
!= LTTNG_OK
) {
1094 * The consumer output for this session should not be used anymore
1095 * since the relayd connection failed thus making any tracing or/and
1096 * streaming not usable.
1098 consumer
->enabled
= 0;
1100 (void) relayd_close(rsock
);
1108 * Send both relayd sockets to a specific consumer and domain. This is a
1109 * helper function to facilitate sending the information to the consumer for a
1112 * The consumer socket lock must be held by the caller.
1114 * Returns LTTNG_OK, or an LTTng error code on failure.
1116 static enum lttng_error_code
send_consumer_relayd_sockets(
1117 enum lttng_domain_type domain
,
1118 unsigned int session_id
, struct consumer_output
*consumer
,
1119 struct consumer_socket
*sock
, const char *session_name
,
1120 const char *hostname
, const char *base_path
, int session_live_timer
,
1121 const uint64_t *current_chunk_id
, time_t session_creation_time
)
1123 enum lttng_error_code status
= LTTNG_OK
;
1128 /* Sending control relayd socket. */
1129 if (!sock
->control_sock_sent
) {
1130 status
= send_consumer_relayd_socket(session_id
,
1131 &consumer
->dst
.net
.control
, consumer
, sock
,
1132 session_name
, hostname
, base_path
, session_live_timer
,
1133 current_chunk_id
, session_creation_time
);
1134 if (status
!= LTTNG_OK
) {
1139 /* Sending data relayd socket. */
1140 if (!sock
->data_sock_sent
) {
1141 status
= send_consumer_relayd_socket(session_id
,
1142 &consumer
->dst
.net
.data
, consumer
, sock
,
1143 session_name
, hostname
, base_path
, session_live_timer
,
1144 current_chunk_id
, session_creation_time
);
1145 if (status
!= LTTNG_OK
) {
1155 * Setup relayd connections for a tracing session. First creates the socket to
1156 * the relayd and send them to the right domain consumer. Consumer type MUST be
1159 int cmd_setup_relayd(struct ltt_session
*session
)
1162 struct ltt_ust_session
*usess
;
1163 struct ltt_kernel_session
*ksess
;
1164 struct consumer_socket
*socket
;
1165 struct lttng_ht_iter iter
;
1166 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
1170 usess
= session
->ust_session
;
1171 ksess
= session
->kernel_session
;
1173 DBG("Setting relayd for session %s", session
->name
);
1175 if (session
->current_trace_chunk
) {
1176 enum lttng_trace_chunk_status status
= lttng_trace_chunk_get_id(
1177 session
->current_trace_chunk
, ¤t_chunk_id
.value
);
1179 if (status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
1180 current_chunk_id
.is_set
= true;
1182 ERR("Failed to get current trace chunk id");
1183 ret
= LTTNG_ERR_UNK
;
1190 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
1191 && usess
->consumer
->enabled
) {
1192 /* For each consumer socket, send relayd sockets */
1193 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1194 socket
, node
.node
) {
1195 pthread_mutex_lock(socket
->lock
);
1196 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1197 usess
->consumer
, socket
,
1198 session
->name
, session
->hostname
,
1200 session
->live_timer
,
1201 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1202 session
->creation_time
);
1203 pthread_mutex_unlock(socket
->lock
);
1204 if (ret
!= LTTNG_OK
) {
1207 /* Session is now ready for network streaming. */
1208 session
->net_handle
= 1;
1210 session
->consumer
->relay_major_version
=
1211 usess
->consumer
->relay_major_version
;
1212 session
->consumer
->relay_minor_version
=
1213 usess
->consumer
->relay_minor_version
;
1216 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1217 && ksess
->consumer
->enabled
) {
1218 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1219 socket
, node
.node
) {
1220 pthread_mutex_lock(socket
->lock
);
1221 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1222 ksess
->consumer
, socket
,
1223 session
->name
, session
->hostname
,
1225 session
->live_timer
,
1226 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1227 session
->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 ksess
->consumer
->relay_major_version
;
1237 session
->consumer
->relay_minor_version
=
1238 ksess
->consumer
->relay_minor_version
;
1247 * Start a kernel session by opening all necessary streams.
1249 static int start_kernel_session(struct ltt_kernel_session
*ksess
, int wpipe
)
1252 struct ltt_kernel_channel
*kchan
;
1254 /* Open kernel metadata */
1255 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1256 ret
= kernel_open_metadata(ksess
);
1258 ret
= LTTNG_ERR_KERN_META_FAIL
;
1263 /* Open kernel metadata stream */
1264 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1265 ret
= kernel_open_metadata_stream(ksess
);
1267 ERR("Kernel create metadata stream failed");
1268 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1273 /* For each channel */
1274 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1275 if (kchan
->stream_count
== 0) {
1276 ret
= kernel_open_channel_stream(kchan
);
1278 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1281 /* Update the stream global counter */
1282 ksess
->stream_count_global
+= ret
;
1286 /* Setup kernel consumer socket and send fds to it */
1287 ret
= init_kernel_tracing(ksess
);
1289 ret
= LTTNG_ERR_KERN_START_FAIL
;
1293 /* This start the kernel tracing */
1294 ret
= kernel_start_session(ksess
);
1296 ret
= LTTNG_ERR_KERN_START_FAIL
;
1300 /* Quiescent wait after starting trace */
1301 kernel_wait_quiescent(wpipe
);
1312 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1314 int cmd_disable_channel(struct ltt_session
*session
,
1315 enum lttng_domain_type domain
, char *channel_name
)
1318 struct ltt_ust_session
*usess
;
1320 usess
= session
->ust_session
;
1325 case LTTNG_DOMAIN_KERNEL
:
1327 ret
= channel_kernel_disable(session
->kernel_session
,
1329 if (ret
!= LTTNG_OK
) {
1333 kernel_wait_quiescent(kernel_tracer_fd
);
1336 case LTTNG_DOMAIN_UST
:
1338 struct ltt_ust_channel
*uchan
;
1339 struct lttng_ht
*chan_ht
;
1341 chan_ht
= usess
->domain_global
.channels
;
1343 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1344 if (uchan
== NULL
) {
1345 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1349 ret
= channel_ust_disable(usess
, uchan
);
1350 if (ret
!= LTTNG_OK
) {
1356 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1368 * Command LTTNG_TRACK_PID processed by the client thread.
1370 * Called with session lock held.
1372 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1380 case LTTNG_DOMAIN_KERNEL
:
1382 struct ltt_kernel_session
*ksess
;
1384 ksess
= session
->kernel_session
;
1386 ret
= kernel_track_pid(ksess
, pid
);
1387 if (ret
!= LTTNG_OK
) {
1391 kernel_wait_quiescent(kernel_tracer_fd
);
1394 case LTTNG_DOMAIN_UST
:
1396 struct ltt_ust_session
*usess
;
1398 usess
= session
->ust_session
;
1400 ret
= trace_ust_track_pid(usess
, pid
);
1401 if (ret
!= LTTNG_OK
) {
1407 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1419 * Command LTTNG_UNTRACK_PID processed by the client thread.
1421 * Called with session lock held.
1423 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1431 case LTTNG_DOMAIN_KERNEL
:
1433 struct ltt_kernel_session
*ksess
;
1435 ksess
= session
->kernel_session
;
1437 ret
= kernel_untrack_pid(ksess
, pid
);
1438 if (ret
!= LTTNG_OK
) {
1442 kernel_wait_quiescent(kernel_tracer_fd
);
1445 case LTTNG_DOMAIN_UST
:
1447 struct ltt_ust_session
*usess
;
1449 usess
= session
->ust_session
;
1451 ret
= trace_ust_untrack_pid(usess
, pid
);
1452 if (ret
!= LTTNG_OK
) {
1458 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1470 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1472 * The wpipe arguments is used as a notifier for the kernel thread.
1474 int cmd_enable_channel(struct ltt_session
*session
,
1475 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1478 struct ltt_ust_session
*usess
= session
->ust_session
;
1479 struct lttng_ht
*chan_ht
;
1486 len
= lttng_strnlen(attr
->name
, sizeof(attr
->name
));
1488 /* Validate channel name */
1489 if (attr
->name
[0] == '.' ||
1490 memchr(attr
->name
, '/', len
) != NULL
) {
1491 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1495 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1500 * Don't try to enable a channel if the session has been started at
1501 * some point in time before. The tracer does not allow it.
1503 if (session
->has_been_started
) {
1504 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1509 * If the session is a live session, remove the switch timer, the
1510 * live timer does the same thing but sends also synchronisation
1511 * beacons for inactive streams.
1513 if (session
->live_timer
> 0) {
1514 attr
->attr
.live_timer_interval
= session
->live_timer
;
1515 attr
->attr
.switch_timer_interval
= 0;
1518 /* Check for feature support */
1519 switch (domain
->type
) {
1520 case LTTNG_DOMAIN_KERNEL
:
1522 if (kernel_supports_ring_buffer_snapshot_sample_positions(kernel_tracer_fd
) != 1) {
1523 /* Sampling position of buffer is not supported */
1524 WARN("Kernel tracer does not support buffer monitoring. "
1525 "Setting the monitor interval timer to 0 "
1526 "(disabled) for channel '%s' of session '%s'",
1527 attr
-> name
, session
->name
);
1528 lttng_channel_set_monitor_timer_interval(attr
, 0);
1532 case LTTNG_DOMAIN_UST
:
1534 case LTTNG_DOMAIN_JUL
:
1535 case LTTNG_DOMAIN_LOG4J
:
1536 case LTTNG_DOMAIN_PYTHON
:
1537 if (!agent_tracing_is_enabled()) {
1538 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1539 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
1544 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1548 switch (domain
->type
) {
1549 case LTTNG_DOMAIN_KERNEL
:
1551 struct ltt_kernel_channel
*kchan
;
1553 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1554 session
->kernel_session
);
1555 if (kchan
== NULL
) {
1556 if (session
->snapshot
.nb_output
> 0 ||
1557 session
->snapshot_mode
) {
1558 /* Enforce mmap output for snapshot sessions. */
1559 attr
->attr
.output
= LTTNG_EVENT_MMAP
;
1561 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1562 if (attr
->name
[0] != '\0') {
1563 session
->kernel_session
->has_non_default_channel
= 1;
1566 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1569 if (ret
!= LTTNG_OK
) {
1573 kernel_wait_quiescent(kernel_tracer_fd
);
1576 case LTTNG_DOMAIN_UST
:
1577 case LTTNG_DOMAIN_JUL
:
1578 case LTTNG_DOMAIN_LOG4J
:
1579 case LTTNG_DOMAIN_PYTHON
:
1581 struct ltt_ust_channel
*uchan
;
1586 * Current agent implementation limitations force us to allow
1587 * only one channel at once in "agent" subdomains. Each
1588 * subdomain has a default channel name which must be strictly
1591 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1592 if (strncmp(attr
->name
, DEFAULT_JUL_CHANNEL_NAME
,
1593 LTTNG_SYMBOL_NAME_LEN
)) {
1594 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1597 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1598 if (strncmp(attr
->name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1599 LTTNG_SYMBOL_NAME_LEN
)) {
1600 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1603 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1604 if (strncmp(attr
->name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1605 LTTNG_SYMBOL_NAME_LEN
)) {
1606 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1611 chan_ht
= usess
->domain_global
.channels
;
1613 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1614 if (uchan
== NULL
) {
1615 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1616 if (attr
->name
[0] != '\0') {
1617 usess
->has_non_default_channel
= 1;
1620 ret
= channel_ust_enable(usess
, uchan
);
1625 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1629 if (ret
== LTTNG_OK
&& attr
->attr
.output
!= LTTNG_EVENT_MMAP
) {
1630 session
->has_non_mmap_channel
= true;
1639 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1641 int cmd_disable_event(struct ltt_session
*session
,
1642 enum lttng_domain_type domain
, char *channel_name
,
1643 struct lttng_event
*event
)
1648 DBG("Disable event command for event \'%s\'", event
->name
);
1650 event_name
= event
->name
;
1652 /* Error out on unhandled search criteria */
1653 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1654 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1655 ret
= LTTNG_ERR_UNK
;
1662 case LTTNG_DOMAIN_KERNEL
:
1664 struct ltt_kernel_channel
*kchan
;
1665 struct ltt_kernel_session
*ksess
;
1667 ksess
= session
->kernel_session
;
1670 * If a non-default channel has been created in the
1671 * session, explicitely require that -c chan_name needs
1674 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1675 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1679 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1680 if (kchan
== NULL
) {
1681 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1685 switch (event
->type
) {
1686 case LTTNG_EVENT_ALL
:
1687 case LTTNG_EVENT_TRACEPOINT
:
1688 case LTTNG_EVENT_SYSCALL
:
1689 case LTTNG_EVENT_PROBE
:
1690 case LTTNG_EVENT_FUNCTION
:
1691 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1692 if (event_name
[0] == '\0') {
1693 ret
= event_kernel_disable_event(kchan
,
1696 ret
= event_kernel_disable_event(kchan
,
1697 event_name
, event
->type
);
1699 if (ret
!= LTTNG_OK
) {
1704 ret
= LTTNG_ERR_UNK
;
1708 kernel_wait_quiescent(kernel_tracer_fd
);
1711 case LTTNG_DOMAIN_UST
:
1713 struct ltt_ust_channel
*uchan
;
1714 struct ltt_ust_session
*usess
;
1716 usess
= session
->ust_session
;
1718 if (validate_ust_event_name(event_name
)) {
1719 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1724 * If a non-default channel has been created in the
1725 * session, explicitly require that -c chan_name needs
1728 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1729 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1733 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1735 if (uchan
== NULL
) {
1736 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1740 switch (event
->type
) {
1741 case LTTNG_EVENT_ALL
:
1743 * An empty event name means that everything
1744 * should be disabled.
1746 if (event
->name
[0] == '\0') {
1747 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1749 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1752 if (ret
!= LTTNG_OK
) {
1757 ret
= LTTNG_ERR_UNK
;
1761 DBG3("Disable UST event %s in channel %s completed", event_name
,
1765 case LTTNG_DOMAIN_LOG4J
:
1766 case LTTNG_DOMAIN_JUL
:
1767 case LTTNG_DOMAIN_PYTHON
:
1770 struct ltt_ust_session
*usess
= session
->ust_session
;
1774 switch (event
->type
) {
1775 case LTTNG_EVENT_ALL
:
1778 ret
= LTTNG_ERR_UNK
;
1782 agt
= trace_ust_find_agent(usess
, domain
);
1784 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1788 * An empty event name means that everything
1789 * should be disabled.
1791 if (event
->name
[0] == '\0') {
1792 ret
= event_agent_disable_all(usess
, agt
);
1794 ret
= event_agent_disable(usess
, agt
, event_name
);
1796 if (ret
!= LTTNG_OK
) {
1803 ret
= LTTNG_ERR_UND
;
1816 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1818 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1819 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1821 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1822 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1825 * Don't try to add a context if the session has been started at
1826 * some point in time before. The tracer does not allow it and would
1827 * result in a corrupted trace.
1829 if (session
->has_been_started
) {
1830 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1834 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1835 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1836 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1840 case LTTNG_DOMAIN_KERNEL
:
1841 assert(session
->kernel_session
);
1843 if (session
->kernel_session
->channel_count
== 0) {
1844 /* Create default channel */
1845 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1846 if (ret
!= LTTNG_OK
) {
1849 chan_kern_created
= 1;
1851 /* Add kernel context to kernel tracer */
1852 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1853 if (ret
!= LTTNG_OK
) {
1857 case LTTNG_DOMAIN_JUL
:
1858 case LTTNG_DOMAIN_LOG4J
:
1861 * Validate channel name.
1862 * If no channel name is given and the domain is JUL or LOG4J,
1863 * set it to the appropriate domain-specific channel name. If
1864 * a name is provided but does not match the expexted channel
1865 * name, return an error.
1867 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1868 strcmp(channel_name
,
1869 DEFAULT_JUL_CHANNEL_NAME
)) {
1870 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1872 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1873 strcmp(channel_name
,
1874 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1875 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1878 /* break is _not_ missing here. */
1880 case LTTNG_DOMAIN_UST
:
1882 struct ltt_ust_session
*usess
= session
->ust_session
;
1883 unsigned int chan_count
;
1887 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1888 if (chan_count
== 0) {
1889 struct lttng_channel
*attr
;
1890 /* Create default channel */
1891 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1893 ret
= LTTNG_ERR_FATAL
;
1897 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1898 if (ret
!= LTTNG_OK
) {
1902 channel_attr_destroy(attr
);
1903 chan_ust_created
= 1;
1906 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1907 free(app_ctx_provider_name
);
1909 app_ctx_name
= NULL
;
1910 app_ctx_provider_name
= NULL
;
1911 if (ret
!= LTTNG_OK
) {
1917 ret
= LTTNG_ERR_UND
;
1925 if (chan_kern_created
) {
1926 struct ltt_kernel_channel
*kchan
=
1927 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1928 session
->kernel_session
);
1929 /* Created previously, this should NOT fail. */
1931 kernel_destroy_channel(kchan
);
1934 if (chan_ust_created
) {
1935 struct ltt_ust_channel
*uchan
=
1936 trace_ust_find_channel_by_name(
1937 session
->ust_session
->domain_global
.channels
,
1938 DEFAULT_CHANNEL_NAME
);
1939 /* Created previously, this should NOT fail. */
1941 /* Remove from the channel list of the session. */
1942 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1944 trace_ust_destroy_channel(uchan
);
1947 free(app_ctx_provider_name
);
1952 static inline bool name_starts_with(const char *name
, const char *prefix
)
1954 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1956 return !strncmp(name
, prefix
, max_cmp_len
);
1959 /* Perform userspace-specific event name validation */
1960 static int validate_ust_event_name(const char *name
)
1970 * Check name against all internal UST event component namespaces used
1973 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1974 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1975 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1984 * Internal version of cmd_enable_event() with a supplemental
1985 * "internal_event" flag which is used to enable internal events which should
1986 * be hidden from clients. Such events are used in the agent implementation to
1987 * enable the events through which all "agent" events are funeled.
1989 static int _cmd_enable_event(struct ltt_session
*session
,
1990 struct lttng_domain
*domain
,
1991 char *channel_name
, struct lttng_event
*event
,
1992 char *filter_expression
,
1993 struct lttng_filter_bytecode
*filter
,
1994 struct lttng_event_exclusion
*exclusion
,
1995 int wpipe
, bool internal_event
)
1997 int ret
= 0, channel_created
= 0;
1998 struct lttng_channel
*attr
= NULL
;
2002 assert(channel_name
);
2004 /* If we have a filter, we must have its filter expression */
2005 assert(!(!!filter_expression
^ !!filter
));
2007 /* Normalize event name as a globbing pattern */
2008 strutils_normalize_star_glob_pattern(event
->name
);
2010 /* Normalize exclusion names as globbing patterns */
2014 for (i
= 0; i
< exclusion
->count
; i
++) {
2015 char *name
= LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion
, i
);
2017 strutils_normalize_star_glob_pattern(name
);
2021 DBG("Enable event command for event \'%s\'", event
->name
);
2025 switch (domain
->type
) {
2026 case LTTNG_DOMAIN_KERNEL
:
2028 struct ltt_kernel_channel
*kchan
;
2031 * If a non-default channel has been created in the
2032 * session, explicitely require that -c chan_name needs
2035 if (session
->kernel_session
->has_non_default_channel
2036 && channel_name
[0] == '\0') {
2037 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2041 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2042 session
->kernel_session
);
2043 if (kchan
== NULL
) {
2044 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
2045 LTTNG_BUFFER_GLOBAL
);
2047 ret
= LTTNG_ERR_FATAL
;
2050 if (lttng_strncpy(attr
->name
, channel_name
,
2051 sizeof(attr
->name
))) {
2052 ret
= LTTNG_ERR_INVALID
;
2056 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2057 if (ret
!= LTTNG_OK
) {
2060 channel_created
= 1;
2063 /* Get the newly created kernel channel pointer */
2064 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2065 session
->kernel_session
);
2066 if (kchan
== NULL
) {
2067 /* This sould not happen... */
2068 ret
= LTTNG_ERR_FATAL
;
2072 switch (event
->type
) {
2073 case LTTNG_EVENT_ALL
:
2075 char *filter_expression_a
= NULL
;
2076 struct lttng_filter_bytecode
*filter_a
= NULL
;
2079 * We need to duplicate filter_expression and filter,
2080 * because ownership is passed to first enable
2083 if (filter_expression
) {
2084 filter_expression_a
= strdup(filter_expression
);
2085 if (!filter_expression_a
) {
2086 ret
= LTTNG_ERR_FATAL
;
2091 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
2093 free(filter_expression_a
);
2094 ret
= LTTNG_ERR_FATAL
;
2097 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
2099 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
2100 ret
= event_kernel_enable_event(kchan
, event
,
2101 filter_expression
, filter
);
2102 /* We have passed ownership */
2103 filter_expression
= NULL
;
2105 if (ret
!= LTTNG_OK
) {
2106 if (channel_created
) {
2107 /* Let's not leak a useless channel. */
2108 kernel_destroy_channel(kchan
);
2110 free(filter_expression_a
);
2114 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
2115 ret
= event_kernel_enable_event(kchan
, event
,
2116 filter_expression_a
, filter_a
);
2117 /* We have passed ownership */
2118 filter_expression_a
= NULL
;
2120 if (ret
!= LTTNG_OK
) {
2125 case LTTNG_EVENT_PROBE
:
2126 case LTTNG_EVENT_USERSPACE_PROBE
:
2127 case LTTNG_EVENT_FUNCTION
:
2128 case LTTNG_EVENT_FUNCTION_ENTRY
:
2129 case LTTNG_EVENT_TRACEPOINT
:
2130 ret
= event_kernel_enable_event(kchan
, event
,
2131 filter_expression
, filter
);
2132 /* We have passed ownership */
2133 filter_expression
= NULL
;
2135 if (ret
!= LTTNG_OK
) {
2136 if (channel_created
) {
2137 /* Let's not leak a useless channel. */
2138 kernel_destroy_channel(kchan
);
2143 case LTTNG_EVENT_SYSCALL
:
2144 ret
= event_kernel_enable_event(kchan
, event
,
2145 filter_expression
, filter
);
2146 /* We have passed ownership */
2147 filter_expression
= NULL
;
2149 if (ret
!= LTTNG_OK
) {
2154 ret
= LTTNG_ERR_UNK
;
2158 kernel_wait_quiescent(kernel_tracer_fd
);
2161 case LTTNG_DOMAIN_UST
:
2163 struct ltt_ust_channel
*uchan
;
2164 struct ltt_ust_session
*usess
= session
->ust_session
;
2169 * If a non-default channel has been created in the
2170 * session, explicitely require that -c chan_name needs
2173 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
2174 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2178 /* Get channel from global UST domain */
2179 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2181 if (uchan
== NULL
) {
2182 /* Create default channel */
2183 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
2184 usess
->buffer_type
);
2186 ret
= LTTNG_ERR_FATAL
;
2189 if (lttng_strncpy(attr
->name
, channel_name
,
2190 sizeof(attr
->name
))) {
2191 ret
= LTTNG_ERR_INVALID
;
2195 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2196 if (ret
!= LTTNG_OK
) {
2200 /* Get the newly created channel reference back */
2201 uchan
= trace_ust_find_channel_by_name(
2202 usess
->domain_global
.channels
, channel_name
);
2206 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
2208 * Don't allow users to add UST events to channels which
2209 * are assigned to a userspace subdomain (JUL, Log4J,
2212 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
2216 if (!internal_event
) {
2218 * Ensure the event name is not reserved for internal
2221 ret
= validate_ust_event_name(event
->name
);
2223 WARN("Userspace event name %s failed validation.",
2225 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2230 /* At this point, the session and channel exist on the tracer */
2231 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2232 filter_expression
, filter
, exclusion
,
2234 /* We have passed ownership */
2235 filter_expression
= NULL
;
2238 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2239 goto already_enabled
;
2240 } else if (ret
!= LTTNG_OK
) {
2245 case LTTNG_DOMAIN_LOG4J
:
2246 case LTTNG_DOMAIN_JUL
:
2247 case LTTNG_DOMAIN_PYTHON
:
2249 const char *default_event_name
, *default_chan_name
;
2251 struct lttng_event uevent
;
2252 struct lttng_domain tmp_dom
;
2253 struct ltt_ust_session
*usess
= session
->ust_session
;
2257 if (!agent_tracing_is_enabled()) {
2258 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2259 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
2263 agt
= trace_ust_find_agent(usess
, domain
->type
);
2265 agt
= agent_create(domain
->type
);
2267 ret
= LTTNG_ERR_NOMEM
;
2270 agent_add(agt
, usess
->agents
);
2273 /* Create the default tracepoint. */
2274 memset(&uevent
, 0, sizeof(uevent
));
2275 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2276 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2277 default_event_name
= event_get_default_agent_ust_name(
2279 if (!default_event_name
) {
2280 ret
= LTTNG_ERR_FATAL
;
2283 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2284 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2287 * The domain type is changed because we are about to enable the
2288 * default channel and event for the JUL domain that are hardcoded.
2289 * This happens in the UST domain.
2291 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2292 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2294 switch (domain
->type
) {
2295 case LTTNG_DOMAIN_LOG4J
:
2296 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2298 case LTTNG_DOMAIN_JUL
:
2299 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2301 case LTTNG_DOMAIN_PYTHON
:
2302 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2305 /* The switch/case we are in makes this impossible */
2310 char *filter_expression_copy
= NULL
;
2311 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2314 const size_t filter_size
= sizeof(
2315 struct lttng_filter_bytecode
)
2318 filter_copy
= zmalloc(filter_size
);
2320 ret
= LTTNG_ERR_NOMEM
;
2323 memcpy(filter_copy
, filter
, filter_size
);
2325 filter_expression_copy
=
2326 strdup(filter_expression
);
2327 if (!filter_expression
) {
2328 ret
= LTTNG_ERR_NOMEM
;
2331 if (!filter_expression_copy
|| !filter_copy
) {
2332 free(filter_expression_copy
);
2338 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2339 (char *) default_chan_name
,
2340 &uevent
, filter_expression_copy
,
2341 filter_copy
, NULL
, wpipe
);
2344 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2345 goto already_enabled
;
2346 } else if (ret
!= LTTNG_OK
) {
2350 /* The wild card * means that everything should be enabled. */
2351 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2352 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2355 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2359 filter_expression
= NULL
;
2360 if (ret
!= LTTNG_OK
) {
2367 ret
= LTTNG_ERR_UND
;
2375 free(filter_expression
);
2378 channel_attr_destroy(attr
);
2384 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2385 * We own filter, exclusion, and filter_expression.
2387 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
2388 char *channel_name
, struct lttng_event
*event
,
2389 char *filter_expression
,
2390 struct lttng_filter_bytecode
*filter
,
2391 struct lttng_event_exclusion
*exclusion
,
2394 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2395 filter_expression
, filter
, exclusion
, wpipe
, false);
2399 * Enable an event which is internal to LTTng. An internal should
2400 * never be made visible to clients and are immune to checks such as
2403 static int cmd_enable_event_internal(struct ltt_session
*session
,
2404 struct lttng_domain
*domain
,
2405 char *channel_name
, struct lttng_event
*event
,
2406 char *filter_expression
,
2407 struct lttng_filter_bytecode
*filter
,
2408 struct lttng_event_exclusion
*exclusion
,
2411 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2412 filter_expression
, filter
, exclusion
, wpipe
, true);
2416 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2418 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2419 struct lttng_event
**events
)
2422 ssize_t nb_events
= 0;
2425 case LTTNG_DOMAIN_KERNEL
:
2426 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2427 if (nb_events
< 0) {
2428 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2432 case LTTNG_DOMAIN_UST
:
2433 nb_events
= ust_app_list_events(events
);
2434 if (nb_events
< 0) {
2435 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2439 case LTTNG_DOMAIN_LOG4J
:
2440 case LTTNG_DOMAIN_JUL
:
2441 case LTTNG_DOMAIN_PYTHON
:
2442 nb_events
= agent_list_events(events
, domain
);
2443 if (nb_events
< 0) {
2444 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2449 ret
= LTTNG_ERR_UND
;
2456 /* Return negative value to differentiate return code */
2461 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2463 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2464 struct lttng_event_field
**fields
)
2467 ssize_t nb_fields
= 0;
2470 case LTTNG_DOMAIN_UST
:
2471 nb_fields
= ust_app_list_event_fields(fields
);
2472 if (nb_fields
< 0) {
2473 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2477 case LTTNG_DOMAIN_KERNEL
:
2478 default: /* fall-through */
2479 ret
= LTTNG_ERR_UND
;
2486 /* Return negative value to differentiate return code */
2490 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2492 return syscall_table_list(events
);
2496 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2498 * Called with session lock held.
2500 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2501 enum lttng_domain_type domain
, int32_t **pids
)
2504 ssize_t nr_pids
= 0;
2507 case LTTNG_DOMAIN_KERNEL
:
2509 struct ltt_kernel_session
*ksess
;
2511 ksess
= session
->kernel_session
;
2512 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2514 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2519 case LTTNG_DOMAIN_UST
:
2521 struct ltt_ust_session
*usess
;
2523 usess
= session
->ust_session
;
2524 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2526 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2531 case LTTNG_DOMAIN_LOG4J
:
2532 case LTTNG_DOMAIN_JUL
:
2533 case LTTNG_DOMAIN_PYTHON
:
2535 ret
= LTTNG_ERR_UND
;
2542 /* Return negative value to differentiate return code */
2547 * Command LTTNG_START_TRACE processed by the client thread.
2549 * Called with session mutex held.
2551 int cmd_start_trace(struct ltt_session
*session
)
2553 enum lttng_error_code ret
;
2554 unsigned long nb_chan
= 0;
2555 struct ltt_kernel_session
*ksession
;
2556 struct ltt_ust_session
*usess
;
2560 /* Ease our life a bit ;) */
2561 ksession
= session
->kernel_session
;
2562 usess
= session
->ust_session
;
2564 /* Is the session already started? */
2565 if (session
->active
) {
2566 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2571 * Starting a session without channel is useless since after that it's not
2572 * possible to enable channel thus inform the client.
2574 if (usess
&& usess
->domain_global
.channels
) {
2575 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2578 nb_chan
+= ksession
->channel_count
;
2581 ret
= LTTNG_ERR_NO_CHANNEL
;
2585 if (session
->output_traces
&& !session
->current_trace_chunk
&&
2586 session_output_supports_trace_chunks(session
)) {
2587 struct lttng_trace_chunk
*trace_chunk
;
2589 trace_chunk
= session_create_new_trace_chunk(
2590 session
, NULL
, NULL
, NULL
);
2592 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
2595 assert(!session
->current_trace_chunk
);
2596 ret
= session_set_trace_chunk(session
, trace_chunk
, NULL
);
2597 lttng_trace_chunk_put(trace_chunk
);
2599 ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
2604 /* Kernel tracing */
2605 if (ksession
!= NULL
) {
2606 DBG("Start kernel tracing session %s", session
->name
);
2607 ret
= start_kernel_session(ksession
, kernel_tracer_fd
);
2608 if (ret
!= LTTNG_OK
) {
2613 /* Flag session that trace should start automatically */
2615 int int_ret
= ust_app_start_trace_all(usess
);
2618 ret
= LTTNG_ERR_UST_START_FAIL
;
2623 /* Flag this after a successful start. */
2624 session
->has_been_started
= 1;
2625 session
->active
= 1;
2628 * Clear the flag that indicates that a rotation was done while the
2629 * session was stopped.
2631 session
->rotated_after_last_stop
= false;
2633 if (session
->rotate_timer_period
) {
2634 int int_ret
= timer_session_rotation_schedule_timer_start(
2635 session
, session
->rotate_timer_period
);
2638 ERR("Failed to enable rotate timer");
2639 ret
= LTTNG_ERR_UNK
;
2651 * Command LTTNG_STOP_TRACE processed by the client thread.
2653 int cmd_stop_trace(struct ltt_session
*session
)
2656 struct ltt_kernel_channel
*kchan
;
2657 struct ltt_kernel_session
*ksession
;
2658 struct ltt_ust_session
*usess
;
2659 bool error_occurred
= false;
2663 DBG("Begin stop session %s (id %" PRIu64
")", session
->name
, session
->id
);
2665 ksession
= session
->kernel_session
;
2666 usess
= session
->ust_session
;
2668 /* Session is not active. Skip everythong and inform the client. */
2669 if (!session
->active
) {
2670 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2675 if (ksession
&& ksession
->active
) {
2676 DBG("Stop kernel tracing");
2678 ret
= kernel_stop_session(ksession
);
2680 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2684 kernel_wait_quiescent(kernel_tracer_fd
);
2686 /* Flush metadata after stopping (if exists) */
2687 if (ksession
->metadata_stream_fd
>= 0) {
2688 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2690 ERR("Kernel metadata flush failed");
2694 /* Flush all buffers after stopping */
2695 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2696 ret
= kernel_flush_buffer(kchan
);
2698 ERR("Kernel flush buffer error");
2702 ksession
->active
= 0;
2703 DBG("Kernel session stopped %s (id %" PRIu64
")", session
->name
,
2707 if (usess
&& usess
->active
) {
2708 ret
= ust_app_stop_trace_all(usess
);
2710 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2715 /* Flag inactive after a successful stop. */
2716 session
->active
= 0;
2717 ret
= !error_occurred
? LTTNG_OK
: LTTNG_ERR_UNK
;
2724 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2726 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2727 struct lttng_uri
*uris
)
2730 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2731 struct ltt_ust_session
*usess
= session
->ust_session
;
2737 /* Can't set consumer URI if the session is active. */
2738 if (session
->active
) {
2739 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2743 /* Set the "global" consumer URIs */
2744 for (i
= 0; i
< nb_uri
; i
++) {
2745 ret
= add_uri_to_consumer(session
,
2747 &uris
[i
], LTTNG_DOMAIN_NONE
);
2748 if (ret
!= LTTNG_OK
) {
2753 /* Set UST session URIs */
2754 if (session
->ust_session
) {
2755 for (i
= 0; i
< nb_uri
; i
++) {
2756 ret
= add_uri_to_consumer(session
,
2757 session
->ust_session
->consumer
,
2758 &uris
[i
], LTTNG_DOMAIN_UST
);
2759 if (ret
!= LTTNG_OK
) {
2765 /* Set kernel session URIs */
2766 if (session
->kernel_session
) {
2767 for (i
= 0; i
< nb_uri
; i
++) {
2768 ret
= add_uri_to_consumer(session
,
2769 session
->kernel_session
->consumer
,
2770 &uris
[i
], LTTNG_DOMAIN_KERNEL
);
2771 if (ret
!= LTTNG_OK
) {
2778 * Make sure to set the session in output mode after we set URI since a
2779 * session can be created without URL (thus flagged in no output mode).
2781 session
->output_traces
= 1;
2783 ksess
->output_traces
= 1;
2787 usess
->output_traces
= 1;
2798 enum lttng_error_code
set_session_output_from_descriptor(
2799 struct ltt_session
*session
,
2800 const struct lttng_session_descriptor
*descriptor
)
2803 enum lttng_error_code ret_code
= LTTNG_OK
;
2804 enum lttng_session_descriptor_type session_type
=
2805 lttng_session_descriptor_get_type(descriptor
);
2806 enum lttng_session_descriptor_output_type output_type
=
2807 lttng_session_descriptor_get_output_type(descriptor
);
2808 struct lttng_uri uris
[2] = {};
2809 size_t uri_count
= 0;
2811 switch (output_type
) {
2812 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE
:
2814 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL
:
2815 lttng_session_descriptor_get_local_output_uri(descriptor
,
2819 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK
:
2820 lttng_session_descriptor_get_network_output_uris(descriptor
,
2821 &uris
[0], &uris
[1]);
2825 ret_code
= LTTNG_ERR_INVALID
;
2829 switch (session_type
) {
2830 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
2832 struct snapshot_output
*new_output
= NULL
;
2834 new_output
= snapshot_output_alloc();
2836 ret_code
= LTTNG_ERR_NOMEM
;
2840 ret
= snapshot_output_init_with_uri(session
,
2841 DEFAULT_SNAPSHOT_MAX_SIZE
,
2842 NULL
, uris
, uri_count
, session
->consumer
,
2843 new_output
, &session
->snapshot
);
2845 ret_code
= (ret
== -ENOMEM
) ?
2846 LTTNG_ERR_NOMEM
: LTTNG_ERR_INVALID
;
2847 snapshot_output_destroy(new_output
);
2850 snapshot_add_output(&session
->snapshot
, new_output
);
2853 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR
:
2854 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
2856 ret_code
= cmd_set_consumer_uri(session
, uri_count
, uris
);
2860 ret_code
= LTTNG_ERR_INVALID
;
2868 enum lttng_error_code
cmd_create_session_from_descriptor(
2869 struct lttng_session_descriptor
*descriptor
,
2870 const lttng_sock_cred
*creds
,
2871 const char *home_path
)
2874 enum lttng_error_code ret_code
;
2875 const char *session_name
;
2876 struct ltt_session
*new_session
= NULL
;
2877 enum lttng_session_descriptor_status descriptor_status
;
2878 const char *base_path
;
2880 session_lock_list();
2882 if (*home_path
!= '/') {
2883 ERR("Home path provided by client is not absolute");
2884 ret_code
= LTTNG_ERR_INVALID
;
2889 descriptor_status
= lttng_session_descriptor_get_session_name(
2890 descriptor
, &session_name
);
2891 switch (descriptor_status
) {
2892 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK
:
2894 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET
:
2895 session_name
= NULL
;
2898 ret_code
= LTTNG_ERR_INVALID
;
2901 ret
= lttng_session_descriptor_get_base_path(descriptor
, &base_path
);
2903 ret_code
= LTTNG_ERR_INVALID
;
2906 ret_code
= session_create(session_name
, creds
->uid
, creds
->gid
,
2907 base_path
, &new_session
);
2908 if (ret_code
!= LTTNG_OK
) {
2912 if (!session_name
) {
2913 ret
= lttng_session_descriptor_set_session_name(descriptor
,
2916 ret_code
= LTTNG_ERR_SESSION_FAIL
;
2921 if (!lttng_session_descriptor_is_output_destination_initialized(
2924 * Only include the session's creation time in the output
2925 * destination if the name of the session itself was
2926 * not auto-generated.
2928 ret_code
= lttng_session_descriptor_set_default_output(
2930 session_name
? &new_session
->creation_time
: NULL
,
2932 if (ret_code
!= LTTNG_OK
) {
2936 new_session
->has_user_specified_directory
=
2937 lttng_session_descriptor_has_output_directory(
2941 switch (lttng_session_descriptor_get_type(descriptor
)) {
2942 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
2943 new_session
->snapshot_mode
= 1;
2945 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
2946 new_session
->live_timer
=
2947 lttng_session_descriptor_live_get_timer_interval(
2954 ret_code
= set_session_output_from_descriptor(new_session
, descriptor
);
2955 if (ret_code
!= LTTNG_OK
) {
2958 new_session
->consumer
->enabled
= 1;
2959 ret_code
= LTTNG_OK
;
2961 /* Release reference provided by the session_create function. */
2962 session_put(new_session
);
2963 if (ret_code
!= LTTNG_OK
&& new_session
) {
2964 /* Release the global reference on error. */
2965 session_destroy(new_session
);
2967 session_unlock_list();
2971 enum lttng_error_code
cmd_create_session(struct command_ctx
*cmd_ctx
, int sock
,
2972 struct lttng_session_descriptor
**return_descriptor
)
2975 size_t payload_size
;
2976 struct lttng_dynamic_buffer payload
;
2977 struct lttng_buffer_view home_dir_view
;
2978 struct lttng_buffer_view session_descriptor_view
;
2979 struct lttng_session_descriptor
*session_descriptor
= NULL
;
2980 enum lttng_error_code ret_code
;
2982 lttng_dynamic_buffer_init(&payload
);
2983 if (cmd_ctx
->lsm
->u
.create_session
.home_dir_size
>=
2985 ret_code
= LTTNG_ERR_INVALID
;
2988 if (cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
>
2989 LTTNG_SESSION_DESCRIPTOR_MAX_LEN
) {
2990 ret_code
= LTTNG_ERR_INVALID
;
2994 payload_size
= cmd_ctx
->lsm
->u
.create_session
.home_dir_size
+
2995 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
;
2996 ret
= lttng_dynamic_buffer_set_size(&payload
, payload_size
);
2998 ret_code
= LTTNG_ERR_NOMEM
;
3002 ret
= lttcomm_recv_unix_sock(sock
, payload
.data
, payload
.size
);
3004 ERR("Reception of session descriptor failed, aborting.");
3005 ret_code
= LTTNG_ERR_SESSION_FAIL
;
3009 home_dir_view
= lttng_buffer_view_from_dynamic_buffer(
3012 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
);
3013 session_descriptor_view
= lttng_buffer_view_from_dynamic_buffer(
3015 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
,
3016 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
);
3018 ret
= lttng_session_descriptor_create_from_buffer(
3019 &session_descriptor_view
, &session_descriptor
);
3021 ERR("Failed to create session descriptor from payload of \"create session\" command");
3022 ret_code
= LTTNG_ERR_INVALID
;
3027 * Sets the descriptor's auto-generated properties (name, output) if
3030 ret_code
= cmd_create_session_from_descriptor(session_descriptor
,
3032 home_dir_view
.size
? home_dir_view
.data
: NULL
);
3033 if (ret_code
!= LTTNG_OK
) {
3037 ret_code
= LTTNG_OK
;
3038 *return_descriptor
= session_descriptor
;
3039 session_descriptor
= NULL
;
3041 lttng_dynamic_buffer_reset(&payload
);
3042 lttng_session_descriptor_destroy(session_descriptor
);
3047 void cmd_destroy_session_reply(const struct ltt_session
*session
,
3048 void *_reply_context
)
3052 const struct cmd_destroy_session_reply_context
*reply_context
=
3054 struct lttng_dynamic_buffer payload
;
3055 struct lttcomm_session_destroy_command_header cmd_header
;
3056 struct lttng_trace_archive_location
*location
= NULL
;
3057 struct lttcomm_lttng_msg llm
= {
3058 .cmd_type
= LTTNG_DESTROY_SESSION
,
3059 .ret_code
= LTTNG_OK
,
3062 sizeof(struct lttcomm_session_destroy_command_header
),
3065 size_t payload_size_before_location
;
3067 lttng_dynamic_buffer_init(&payload
);
3069 ret
= lttng_dynamic_buffer_append(&payload
, &llm
, sizeof(llm
));
3071 ERR("Failed to append session destruction message");
3075 cmd_header
.rotation_state
=
3076 (int32_t) (reply_context
->implicit_rotation_on_destroy
?
3077 session
->rotation_state
:
3078 LTTNG_ROTATION_STATE_NO_ROTATION
);
3079 ret
= lttng_dynamic_buffer_append(&payload
, &cmd_header
,
3080 sizeof(cmd_header
));
3082 ERR("Failed to append session destruction command header");
3086 if (!reply_context
->implicit_rotation_on_destroy
) {
3087 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3091 if (session
->rotation_state
!= LTTNG_ROTATION_STATE_COMPLETED
) {
3092 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3097 location
= session_get_trace_archive_location(session
);
3099 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3104 payload_size_before_location
= payload
.size
;
3105 comm_ret
= lttng_trace_archive_location_serialize(location
,
3108 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3112 /* Update the message to indicate the location's length. */
3113 ((struct lttcomm_lttng_msg
*) payload
.data
)->data_size
=
3114 payload
.size
- payload_size_before_location
;
3116 comm_ret
= lttcomm_send_unix_sock(reply_context
->reply_sock_fd
,
3117 payload
.data
, payload
.size
);
3118 if (comm_ret
!= (ssize_t
) payload
.size
) {
3119 ERR("Failed to send result of the destruction of session \"%s\" to client",
3123 ret
= close(reply_context
->reply_sock_fd
);
3125 PERROR("Failed to close client socket in deferred session destroy reply");
3127 lttng_dynamic_buffer_reset(&payload
);
3128 free(_reply_context
);
3132 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3134 * Called with session lock held.
3136 int cmd_destroy_session(struct ltt_session
*session
,
3137 struct notification_thread_handle
*notification_thread_handle
,
3141 struct cmd_destroy_session_reply_context
*reply_context
= NULL
;
3144 reply_context
= zmalloc(sizeof(*reply_context
));
3145 if (!reply_context
) {
3146 ret
= LTTNG_ERR_NOMEM
;
3149 reply_context
->reply_sock_fd
= *sock_fd
;
3155 DBG("Begin destroy session %s (id %" PRIu64
")", session
->name
,
3157 if (session
->active
) {
3158 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3160 ret
= cmd_stop_trace(session
);
3161 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
3162 /* Carry on with the destruction of the session. */
3163 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3164 session
->name
, lttng_strerror(-ret
));
3168 if (session
->rotation_schedule_timer_enabled
) {
3169 if (timer_session_rotation_schedule_timer_stop(
3171 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3176 if (session
->rotate_size
) {
3177 unsubscribe_session_consumed_size_rotation(session
, notification_thread_handle
);
3178 session
->rotate_size
= 0;
3181 if (session
->most_recent_chunk_id
.is_set
&&
3182 session
->most_recent_chunk_id
.value
!= 0 &&
3183 session
->current_trace_chunk
&& session
->output_traces
) {
3185 * Perform a last rotation on destruction if rotations have
3186 * occurred during the session's lifetime.
3188 ret
= cmd_rotate_session(session
, NULL
, false);
3189 if (ret
!= LTTNG_OK
) {
3190 ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s",
3191 session
->name
, lttng_strerror(-ret
));
3193 if (reply_context
) {
3194 reply_context
->implicit_rotation_on_destroy
= true;
3196 } else if (session
->has_been_started
&& session
->current_trace_chunk
&&
3197 session_output_supports_trace_chunks(session
)) {
3199 * The user has not triggered a session rotation. However, to
3200 * ensure all data has been consumed, the session is rotated
3201 * to a 'null' trace chunk before it is destroyed.
3203 * This is a "quiet" rotation meaning that no notification is
3204 * emitted and no renaming of the current trace chunk takes
3207 ret
= cmd_rotate_session(session
, NULL
, true);
3208 if (ret
!= LTTNG_OK
) {
3209 ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s",
3210 session
->name
, lttng_strerror(-ret
));
3214 if (session
->shm_path
[0]) {
3216 * When a session is created with an explicit shm_path,
3217 * the consumer daemon will create its shared memory files
3218 * at that location and will *not* unlink them. This is normal
3219 * as the intention of that feature is to make it possible
3220 * to retrieve the content of those files should a crash occur.
3222 * To ensure the content of those files can be used, the
3223 * sessiond daemon will replicate the content of the metadata
3224 * cache in a metadata file.
3226 * On clean-up, it is expected that the consumer daemon will
3227 * unlink the shared memory files and that the session daemon
3228 * will unlink the metadata file. Then, the session's directory
3229 * in the shm path can be removed.
3231 * Unfortunately, a flaw in the design of the sessiond's and
3232 * consumerd's tear down of channels makes it impossible to
3233 * determine when the sessiond _and_ the consumerd have both
3234 * destroyed their representation of a channel. For one, the
3235 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3236 * callbacks in both daemons.
3238 * However, it is also impossible for the sessiond to know when
3239 * the consumer daemon is done destroying its channel(s) since
3240 * it occurs as a reaction to the closing of the channel's file
3241 * descriptor. There is no resulting communication initiated
3242 * from the consumerd to the sessiond to confirm that the
3243 * operation is completed (and was successful).
3245 * Until this is all fixed, the session daemon checks for the
3246 * removal of the session's shm path which makes it possible
3247 * to safely advertise a session as having been destroyed.
3249 * Prior to this fix, it was not possible to reliably save
3250 * a session making use of the --shm-path option, destroy it,
3251 * and load it again. This is because the creation of the
3252 * session would fail upon seeing the session's shm path
3253 * already in existence.
3255 * Note that none of the error paths in the check for the
3256 * directory's existence return an error. This is normal
3257 * as there isn't much that can be done. The session will
3258 * be destroyed properly, except that we can't offer the
3259 * guarantee that the same session can be re-created.
3261 current_completion_handler
= &destroy_completion_handler
.handler
;
3262 ret
= lttng_strncpy(destroy_completion_handler
.shm_path
,
3264 sizeof(destroy_completion_handler
.shm_path
));
3269 * The session is destroyed. However, note that the command context
3270 * still holds a reference to the session, thus delaying its destruction
3271 * _at least_ up to the point when that reference is released.
3273 session_destroy(session
);
3274 if (reply_context
) {
3275 ret
= session_add_destroy_notifier(session
,
3276 cmd_destroy_session_reply
,
3277 (void *) reply_context
);
3279 ret
= LTTNG_ERR_FATAL
;
3291 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3293 int cmd_register_consumer(struct ltt_session
*session
,
3294 enum lttng_domain_type domain
, const char *sock_path
,
3295 struct consumer_data
*cdata
)
3298 struct consumer_socket
*socket
= NULL
;
3305 case LTTNG_DOMAIN_KERNEL
:
3307 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3311 /* Can't register a consumer if there is already one */
3312 if (ksess
->consumer_fds_sent
!= 0) {
3313 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3317 sock
= lttcomm_connect_unix_sock(sock_path
);
3319 ret
= LTTNG_ERR_CONNECT_FAIL
;
3322 cdata
->cmd_sock
= sock
;
3324 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
3325 if (socket
== NULL
) {
3328 PERROR("close register consumer");
3330 cdata
->cmd_sock
= -1;
3331 ret
= LTTNG_ERR_FATAL
;
3335 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
3336 if (socket
->lock
== NULL
) {
3337 PERROR("zmalloc pthread mutex");
3338 ret
= LTTNG_ERR_FATAL
;
3341 pthread_mutex_init(socket
->lock
, NULL
);
3342 socket
->registered
= 1;
3345 consumer_add_socket(socket
, ksess
->consumer
);
3348 pthread_mutex_lock(&cdata
->pid_mutex
);
3350 pthread_mutex_unlock(&cdata
->pid_mutex
);
3355 /* TODO: Userspace tracing */
3356 ret
= LTTNG_ERR_UND
;
3364 consumer_destroy_socket(socket
);
3370 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3372 ssize_t
cmd_list_domains(struct ltt_session
*session
,
3373 struct lttng_domain
**domains
)
3378 struct lttng_ht_iter iter
;
3380 if (session
->kernel_session
!= NULL
) {
3381 DBG3("Listing domains found kernel domain");
3385 if (session
->ust_session
!= NULL
) {
3386 DBG3("Listing domains found UST global domain");
3390 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3392 if (agt
->being_used
) {
3403 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3404 if (*domains
== NULL
) {
3405 ret
= LTTNG_ERR_FATAL
;
3409 if (session
->kernel_session
!= NULL
) {
3410 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3412 /* Kernel session buffer type is always GLOBAL */
3413 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
3418 if (session
->ust_session
!= NULL
) {
3419 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3420 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3424 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3426 if (agt
->being_used
) {
3427 (*domains
)[index
].type
= agt
->domain
;
3428 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3438 /* Return negative value to differentiate return code */
3444 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3446 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
3447 struct ltt_session
*session
, struct lttng_channel
**channels
)
3449 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
3452 case LTTNG_DOMAIN_KERNEL
:
3453 if (session
->kernel_session
!= NULL
) {
3454 nb_chan
= session
->kernel_session
->channel_count
;
3456 DBG3("Number of kernel channels %zd", nb_chan
);
3458 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
3462 case LTTNG_DOMAIN_UST
:
3463 if (session
->ust_session
!= NULL
) {
3465 nb_chan
= lttng_ht_get_count(
3466 session
->ust_session
->domain_global
.channels
);
3469 DBG3("Number of UST global channels %zd", nb_chan
);
3471 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
3476 ret
= -LTTNG_ERR_UND
;
3481 const size_t channel_size
= sizeof(struct lttng_channel
) +
3482 sizeof(struct lttng_channel_extended
);
3483 struct lttng_channel_extended
*channel_exts
;
3485 payload_size
= nb_chan
* channel_size
;
3486 *channels
= zmalloc(payload_size
);
3487 if (*channels
== NULL
) {
3488 ret
= -LTTNG_ERR_FATAL
;
3492 channel_exts
= ((void *) *channels
) +
3493 (nb_chan
* sizeof(struct lttng_channel
));
3494 ret
= list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3495 if (ret
!= LTTNG_OK
) {
3510 * Command LTTNG_LIST_EVENTS processed by the client thread.
3512 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3513 struct ltt_session
*session
, char *channel_name
,
3514 struct lttng_event
**events
, size_t *total_size
)
3517 ssize_t nb_event
= 0;
3520 case LTTNG_DOMAIN_KERNEL
:
3521 if (session
->kernel_session
!= NULL
) {
3522 nb_event
= list_lttng_kernel_events(channel_name
,
3523 session
->kernel_session
, events
,
3527 case LTTNG_DOMAIN_UST
:
3529 if (session
->ust_session
!= NULL
) {
3530 nb_event
= list_lttng_ust_global_events(channel_name
,
3531 &session
->ust_session
->domain_global
, events
,
3536 case LTTNG_DOMAIN_LOG4J
:
3537 case LTTNG_DOMAIN_JUL
:
3538 case LTTNG_DOMAIN_PYTHON
:
3539 if (session
->ust_session
) {
3540 struct lttng_ht_iter iter
;
3544 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3545 &iter
.iter
, agt
, node
.node
) {
3546 if (agt
->domain
== domain
) {
3547 nb_event
= list_lttng_agent_events(
3557 ret
= LTTNG_ERR_UND
;
3564 /* Return negative value to differentiate return code */
3569 * Using the session list, filled a lttng_session array to send back to the
3570 * client for session listing.
3572 * The session list lock MUST be acquired before calling this function. Use
3573 * session_lock_list() and session_unlock_list().
3575 void cmd_list_lttng_sessions(struct lttng_session
*sessions
,
3576 size_t session_count
, uid_t uid
, gid_t gid
)
3580 struct ltt_session
*session
;
3581 struct ltt_session_list
*list
= session_get_list();
3582 struct lttng_session_extended
*extended
=
3583 (typeof(extended
)) (&sessions
[session_count
]);
3585 DBG("Getting all available session for UID %d GID %d",
3588 * Iterate over session list and append data after the control struct in
3591 cds_list_for_each_entry(session
, &list
->head
, list
) {
3592 if (!session_get(session
)) {
3596 * Only list the sessions the user can control.
3598 if (!session_access_ok(session
, uid
, gid
) ||
3599 session
->destroyed
) {
3600 session_put(session
);
3604 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3605 struct ltt_ust_session
*usess
= session
->ust_session
;
3607 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3608 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3609 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3610 ret
= build_network_session_path(sessions
[i
].path
,
3611 sizeof(sessions
[i
].path
), session
);
3613 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3614 session
->consumer
->dst
.session_root_path
);
3617 PERROR("snprintf session path");
3618 session_put(session
);
3622 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3623 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3624 sessions
[i
].enabled
= session
->active
;
3625 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3626 sessions
[i
].live_timer_interval
= session
->live_timer
;
3627 extended
[i
].creation_time
.value
= (uint64_t) session
->creation_time
;
3628 extended
[i
].creation_time
.is_set
= 1;
3630 session_put(session
);
3635 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3636 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3638 int cmd_data_pending(struct ltt_session
*session
)
3641 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3642 struct ltt_ust_session
*usess
= session
->ust_session
;
3646 DBG("Data pending for session %s", session
->name
);
3648 /* Session MUST be stopped to ask for data availability. */
3649 if (session
->active
) {
3650 ret
= LTTNG_ERR_SESSION_STARTED
;
3654 * If stopped, just make sure we've started before else the above call
3655 * will always send that there is data pending.
3657 * The consumer assumes that when the data pending command is received,
3658 * the trace has been started before or else no output data is written
3659 * by the streams which is a condition for data pending. So, this is
3660 * *VERY* important that we don't ask the consumer before a start
3663 if (!session
->has_been_started
) {
3669 /* A rotation is still pending, we have to wait. */
3670 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
3671 DBG("Rotate still pending for session %s", session
->name
);
3676 if (ksess
&& ksess
->consumer
) {
3677 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3679 /* Data is still being extracted for the kernel. */
3684 if (usess
&& usess
->consumer
) {
3685 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3687 /* Data is still being extracted for the kernel. */
3692 /* Data is ready to be read by a viewer */
3700 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3702 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3704 int cmd_snapshot_add_output(struct ltt_session
*session
,
3705 struct lttng_snapshot_output
*output
, uint32_t *id
)
3708 struct snapshot_output
*new_output
;
3713 DBG("Cmd snapshot add output for session %s", session
->name
);
3716 * Can't create an output if the session is not set in no-output mode.
3718 if (session
->output_traces
) {
3719 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3723 if (session
->has_non_mmap_channel
) {
3724 ret
= LTTNG_ERR_SNAPSHOT_UNSUPPORTED
;
3728 /* Only one output is allowed until we have the "tee" feature. */
3729 if (session
->snapshot
.nb_output
== 1) {
3730 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3734 new_output
= snapshot_output_alloc();
3736 ret
= LTTNG_ERR_NOMEM
;
3740 ret
= snapshot_output_init(session
, output
->max_size
, output
->name
,
3741 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3742 &session
->snapshot
);
3744 if (ret
== -ENOMEM
) {
3745 ret
= LTTNG_ERR_NOMEM
;
3747 ret
= LTTNG_ERR_INVALID
;
3753 snapshot_add_output(&session
->snapshot
, new_output
);
3755 *id
= new_output
->id
;
3762 snapshot_output_destroy(new_output
);
3768 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3770 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3772 int cmd_snapshot_del_output(struct ltt_session
*session
,
3773 struct lttng_snapshot_output
*output
)
3776 struct snapshot_output
*sout
= NULL
;
3784 * Permission denied to create an output if the session is not
3785 * set in no output mode.
3787 if (session
->output_traces
) {
3788 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3793 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3795 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3796 } else if (*output
->name
!= '\0') {
3797 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3799 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3802 ret
= LTTNG_ERR_INVALID
;
3806 snapshot_delete_output(&session
->snapshot
, sout
);
3807 snapshot_output_destroy(sout
);
3816 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3818 * If no output is available, outputs is untouched and 0 is returned.
3820 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3822 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3823 struct lttng_snapshot_output
**outputs
)
3826 struct lttng_snapshot_output
*list
= NULL
;
3827 struct lttng_ht_iter iter
;
3828 struct snapshot_output
*output
;
3833 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3836 * Permission denied to create an output if the session is not
3837 * set in no output mode.
3839 if (session
->output_traces
) {
3840 ret
= -LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3844 if (session
->snapshot
.nb_output
== 0) {
3849 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
3851 ret
= -LTTNG_ERR_NOMEM
;
3855 /* Copy list from session to the new list object. */
3857 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
3858 output
, node
.node
) {
3859 assert(output
->consumer
);
3860 list
[idx
].id
= output
->id
;
3861 list
[idx
].max_size
= output
->max_size
;
3862 if (lttng_strncpy(list
[idx
].name
, output
->name
,
3863 sizeof(list
[idx
].name
))) {
3864 ret
= -LTTNG_ERR_INVALID
;
3867 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
3868 if (lttng_strncpy(list
[idx
].ctrl_url
,
3869 output
->consumer
->dst
.session_root_path
,
3870 sizeof(list
[idx
].ctrl_url
))) {
3871 ret
= -LTTNG_ERR_INVALID
;
3876 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
3877 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
3879 ret
= -LTTNG_ERR_NOMEM
;
3884 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
3885 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
3887 ret
= -LTTNG_ERR_NOMEM
;
3896 ret
= session
->snapshot
.nb_output
;
3905 * Check if we can regenerate the metadata for this session.
3906 * Only kernel, UST per-uid and non-live sessions are supported.
3908 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3911 int check_regenerate_metadata_support(struct ltt_session
*session
)
3917 if (session
->live_timer
!= 0) {
3918 ret
= LTTNG_ERR_LIVE_SESSION
;
3921 if (!session
->active
) {
3922 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
3925 if (session
->ust_session
) {
3926 switch (session
->ust_session
->buffer_type
) {
3927 case LTTNG_BUFFER_PER_UID
:
3929 case LTTNG_BUFFER_PER_PID
:
3930 ret
= LTTNG_ERR_PER_PID_SESSION
;
3934 ret
= LTTNG_ERR_UNK
;
3938 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
3939 session
->consumer
->relay_minor_version
< 8) {
3940 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
3950 int clear_metadata_file(int fd
)
3955 lseek_ret
= lseek(fd
, 0, SEEK_SET
);
3956 if (lseek_ret
< 0) {
3962 ret
= ftruncate(fd
, 0);
3964 PERROR("ftruncate");
3973 int ust_regenerate_metadata(struct ltt_ust_session
*usess
)
3976 struct buffer_reg_uid
*uid_reg
= NULL
;
3977 struct buffer_reg_session
*session_reg
= NULL
;
3980 cds_list_for_each_entry(uid_reg
, &usess
->buffer_reg_uid_list
, lnode
) {
3981 struct ust_registry_session
*registry
;
3982 struct ust_registry_channel
*chan
;
3983 struct lttng_ht_iter iter_chan
;
3985 session_reg
= uid_reg
->registry
;
3986 registry
= session_reg
->reg
.ust
;
3988 pthread_mutex_lock(®istry
->lock
);
3989 registry
->metadata_len_sent
= 0;
3990 memset(registry
->metadata
, 0, registry
->metadata_alloc_len
);
3991 registry
->metadata_len
= 0;
3992 registry
->metadata_version
++;
3993 if (registry
->metadata_fd
> 0) {
3994 /* Clear the metadata file's content. */
3995 ret
= clear_metadata_file(registry
->metadata_fd
);
3997 pthread_mutex_unlock(®istry
->lock
);
4002 ret
= ust_metadata_session_statedump(registry
, NULL
,
4003 registry
->major
, registry
->minor
);
4005 pthread_mutex_unlock(®istry
->lock
);
4006 ERR("Failed to generate session metadata (err = %d)",
4010 cds_lfht_for_each_entry(registry
->channels
->ht
, &iter_chan
.iter
,
4012 struct ust_registry_event
*event
;
4013 struct lttng_ht_iter iter_event
;
4015 ret
= ust_metadata_channel_statedump(registry
, chan
);
4017 pthread_mutex_unlock(®istry
->lock
);
4018 ERR("Failed to generate channel metadata "
4022 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter_event
.iter
,
4024 ret
= ust_metadata_event_statedump(registry
,
4027 pthread_mutex_unlock(®istry
->lock
);
4028 ERR("Failed to generate event metadata "
4034 pthread_mutex_unlock(®istry
->lock
);
4043 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
4045 * Ask the consumer to truncate the existing metadata file(s) and
4046 * then regenerate the metadata. Live and per-pid sessions are not
4047 * supported and return an error.
4049 * Return 0 on success or else a LTTNG_ERR code.
4051 int cmd_regenerate_metadata(struct ltt_session
*session
)
4057 ret
= check_regenerate_metadata_support(session
);
4062 if (session
->kernel_session
) {
4063 ret
= kernctl_session_regenerate_metadata(
4064 session
->kernel_session
->fd
);
4066 ERR("Failed to regenerate the kernel metadata");
4071 if (session
->ust_session
) {
4072 ret
= ust_regenerate_metadata(session
->ust_session
);
4074 ERR("Failed to regenerate the UST metadata");
4078 DBG("Cmd metadata regenerate for session %s", session
->name
);
4086 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
4088 * Ask the tracer to regenerate a new statedump.
4090 * Return 0 on success or else a LTTNG_ERR code.
4092 int cmd_regenerate_statedump(struct ltt_session
*session
)
4098 if (!session
->active
) {
4099 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
4103 if (session
->kernel_session
) {
4104 ret
= kernctl_session_regenerate_statedump(
4105 session
->kernel_session
->fd
);
4107 * Currently, the statedump in kernel can only fail if out
4111 if (ret
== -ENOMEM
) {
4112 ret
= LTTNG_ERR_REGEN_STATEDUMP_NOMEM
;
4114 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4116 ERR("Failed to regenerate the kernel statedump");
4121 if (session
->ust_session
) {
4122 ret
= ust_app_regenerate_statedump_all(session
->ust_session
);
4124 * Currently, the statedump in UST always returns 0.
4127 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4128 ERR("Failed to regenerate the UST statedump");
4132 DBG("Cmd regenerate statedump for session %s", session
->name
);
4139 int cmd_register_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4140 struct notification_thread_handle
*notification_thread
)
4144 ssize_t sock_recv_len
;
4145 struct lttng_trigger
*trigger
= NULL
;
4146 struct lttng_buffer_view view
;
4147 struct lttng_dynamic_buffer trigger_buffer
;
4149 lttng_dynamic_buffer_init(&trigger_buffer
);
4150 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4151 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4153 ret
= LTTNG_ERR_NOMEM
;
4157 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4159 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4160 ERR("Failed to receive \"register trigger\" command payload");
4161 /* TODO: should this be a new error enum ? */
4162 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4166 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4167 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4169 ERR("Invalid trigger payload received in \"register trigger\" command");
4170 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4174 ret
= notification_thread_command_register_trigger(notification_thread
,
4176 /* Ownership of trigger was transferred. */
4179 lttng_trigger_destroy(trigger
);
4180 lttng_dynamic_buffer_reset(&trigger_buffer
);
4184 int cmd_unregister_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4185 struct notification_thread_handle
*notification_thread
)
4189 ssize_t sock_recv_len
;
4190 struct lttng_trigger
*trigger
= NULL
;
4191 struct lttng_buffer_view view
;
4192 struct lttng_dynamic_buffer trigger_buffer
;
4194 lttng_dynamic_buffer_init(&trigger_buffer
);
4195 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4196 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4198 ret
= LTTNG_ERR_NOMEM
;
4202 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4204 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4205 ERR("Failed to receive \"unregister trigger\" command payload");
4206 /* TODO: should this be a new error enum ? */
4207 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4211 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4212 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4214 ERR("Invalid trigger payload received in \"unregister trigger\" command");
4215 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4219 ret
= notification_thread_command_unregister_trigger(notification_thread
,
4222 lttng_trigger_destroy(trigger
);
4223 lttng_dynamic_buffer_reset(&trigger_buffer
);
4228 * Send relayd sockets from snapshot output to consumer. Ignore request if the
4229 * snapshot output is *not* set with a remote destination.
4231 * Return LTTNG_OK on success or a LTTNG_ERR code.
4233 static enum lttng_error_code
set_relayd_for_snapshot(
4234 struct consumer_output
*output
,
4235 const struct ltt_session
*session
)
4237 enum lttng_error_code status
= LTTNG_OK
;
4238 struct lttng_ht_iter iter
;
4239 struct consumer_socket
*socket
;
4240 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
4241 const char *base_path
;
4246 DBG2("Set relayd object from snapshot output");
4248 if (session
->current_trace_chunk
) {
4249 enum lttng_trace_chunk_status chunk_status
=
4250 lttng_trace_chunk_get_id(
4251 session
->current_trace_chunk
,
4252 ¤t_chunk_id
.value
);
4254 if (chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
4255 current_chunk_id
.is_set
= true;
4257 ERR("Failed to get current trace chunk id");
4258 status
= LTTNG_ERR_UNK
;
4263 /* Ignore if snapshot consumer output is not network. */
4264 if (output
->type
!= CONSUMER_DST_NET
) {
4269 * The snapshot record URI base path overrides the session
4272 if (output
->dst
.net
.control
.subdir
[0] != '\0') {
4273 base_path
= output
->dst
.net
.control
.subdir
;
4275 base_path
= session
->base_path
;
4279 * For each consumer socket, create and send the relayd object of the
4283 cds_lfht_for_each_entry(output
->socks
->ht
, &iter
.iter
,
4284 socket
, node
.node
) {
4285 pthread_mutex_lock(socket
->lock
);
4286 status
= send_consumer_relayd_sockets(0, session
->id
,
4288 session
->name
, session
->hostname
,
4290 session
->live_timer
,
4291 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
4292 session
->creation_time
);
4293 pthread_mutex_unlock(socket
->lock
);
4294 if (status
!= LTTNG_OK
) {
4306 * Record a kernel snapshot.
4308 * Return LTTNG_OK on success or a LTTNG_ERR code.
4310 static enum lttng_error_code
record_kernel_snapshot(
4311 struct ltt_kernel_session
*ksess
,
4312 const struct consumer_output
*output
,
4313 const struct ltt_session
*session
,
4314 int wait
, uint64_t nb_packets_per_stream
)
4316 enum lttng_error_code status
;
4322 status
= kernel_snapshot_record(
4323 ksess
, output
, wait
, nb_packets_per_stream
);
4328 * Record a UST snapshot.
4330 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
4332 static enum lttng_error_code
record_ust_snapshot(struct ltt_ust_session
*usess
,
4333 const struct consumer_output
*output
,
4334 const struct ltt_session
*session
,
4335 int wait
, uint64_t nb_packets_per_stream
)
4337 enum lttng_error_code status
;
4343 status
= ust_app_snapshot_record(
4344 usess
, output
, wait
, nb_packets_per_stream
);
4349 uint64_t get_session_size_one_more_packet_per_stream(
4350 const struct ltt_session
*session
, uint64_t cur_nr_packets
)
4352 uint64_t tot_size
= 0;
4354 if (session
->kernel_session
) {
4355 struct ltt_kernel_channel
*chan
;
4356 const struct ltt_kernel_session
*ksess
=
4357 session
->kernel_session
;
4359 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
4360 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
4362 * Don't take channel into account if we
4363 * already grab all its packets.
4367 tot_size
+= chan
->channel
->attr
.subbuf_size
4368 * chan
->stream_count
;
4372 if (session
->ust_session
) {
4373 const struct ltt_ust_session
*usess
= session
->ust_session
;
4375 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
4383 * Calculate the number of packets we can grab from each stream that
4384 * fits within the overall snapshot max size.
4386 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
4387 * the number of packets per stream.
4389 * TODO: this approach is not perfect: we consider the worse case
4390 * (packet filling the sub-buffers) as an upper bound, but we could do
4391 * better if we do this calculation while we actually grab the packet
4392 * content: we would know how much padding we don't actually store into
4395 * This algorithm is currently bounded by the number of packets per
4398 * Since we call this algorithm before actually grabbing the data, it's
4399 * an approximation: for instance, applications could appear/disappear
4400 * in between this call and actually grabbing data.
4403 int64_t get_session_nb_packets_per_stream(const struct ltt_session
*session
,
4407 uint64_t cur_nb_packets
= 0;
4410 return 0; /* Infinite */
4413 size_left
= max_size
;
4415 uint64_t one_more_packet_tot_size
;
4417 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(
4418 session
, cur_nb_packets
);
4419 if (!one_more_packet_tot_size
) {
4420 /* We are already grabbing all packets. */
4423 size_left
-= one_more_packet_tot_size
;
4424 if (size_left
< 0) {
4429 if (!cur_nb_packets
) {
4430 /* Not enough room to grab one packet of each stream, error. */
4433 return cur_nb_packets
;
4437 enum lttng_error_code
snapshot_record(struct ltt_session
*session
,
4438 const struct snapshot_output
*snapshot_output
, int wait
)
4440 int64_t nb_packets_per_stream
;
4441 char snapshot_chunk_name
[LTTNG_NAME_MAX
];
4443 enum lttng_error_code ret_code
= LTTNG_OK
;
4444 struct lttng_trace_chunk
*snapshot_trace_chunk
;
4445 struct consumer_output
*original_ust_consumer_output
= NULL
;
4446 struct consumer_output
*original_kernel_consumer_output
= NULL
;
4447 struct consumer_output
*snapshot_ust_consumer_output
= NULL
;
4448 struct consumer_output
*snapshot_kernel_consumer_output
= NULL
;
4450 ret
= snprintf(snapshot_chunk_name
, sizeof(snapshot_chunk_name
),
4452 snapshot_output
->name
,
4453 snapshot_output
->datetime
,
4454 snapshot_output
->nb_snapshot
);
4455 if (ret
< 0 || ret
>= sizeof(snapshot_chunk_name
)) {
4456 ERR("Failed to format snapshot name");
4457 ret_code
= LTTNG_ERR_INVALID
;
4460 DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"",
4461 snapshot_output
->name
, session
->name
,
4462 snapshot_chunk_name
);
4463 if (!session
->kernel_session
&& !session
->ust_session
) {
4464 ERR("Failed to record snapshot as no channels exist");
4465 ret_code
= LTTNG_ERR_NO_CHANNEL
;
4469 if (session
->kernel_session
) {
4470 original_kernel_consumer_output
=
4471 session
->kernel_session
->consumer
;
4472 snapshot_kernel_consumer_output
=
4473 consumer_copy_output(snapshot_output
->consumer
);
4474 ret
= consumer_copy_sockets(snapshot_kernel_consumer_output
,
4475 original_kernel_consumer_output
);
4477 ERR("Failed to copy consumer sockets from snapshot output configuration");
4478 ret_code
= LTTNG_ERR_NOMEM
;
4481 ret_code
= set_relayd_for_snapshot(
4482 snapshot_kernel_consumer_output
, session
);
4483 if (ret_code
!= LTTNG_OK
) {
4484 ERR("Failed to setup relay daemon for kernel tracer snapshot");
4487 session
->kernel_session
->consumer
=
4488 snapshot_kernel_consumer_output
;
4490 if (session
->ust_session
) {
4491 original_ust_consumer_output
= session
->ust_session
->consumer
;
4492 snapshot_ust_consumer_output
=
4493 consumer_copy_output(snapshot_output
->consumer
);
4494 ret
= consumer_copy_sockets(snapshot_ust_consumer_output
,
4495 original_ust_consumer_output
);
4497 ERR("Failed to copy consumer sockets from snapshot output configuration");
4498 ret_code
= LTTNG_ERR_NOMEM
;
4501 ret_code
= set_relayd_for_snapshot(
4502 snapshot_ust_consumer_output
, session
);
4503 if (ret_code
!= LTTNG_OK
) {
4504 ERR("Failed to setup relay daemon for userspace tracer snapshot");
4507 session
->ust_session
->consumer
=
4508 snapshot_ust_consumer_output
;
4511 snapshot_trace_chunk
= session_create_new_trace_chunk(session
,
4512 snapshot_kernel_consumer_output
?:
4513 snapshot_ust_consumer_output
,
4514 consumer_output_get_base_path(
4515 snapshot_output
->consumer
),
4516 snapshot_chunk_name
);
4517 if (!snapshot_trace_chunk
) {
4518 ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"",
4520 ret_code
= LTTNG_ERR_CREATE_DIR_FAIL
;
4523 assert(!session
->current_trace_chunk
);
4524 ret
= session_set_trace_chunk(session
, snapshot_trace_chunk
, NULL
);
4525 lttng_trace_chunk_put(snapshot_trace_chunk
);
4526 snapshot_trace_chunk
= NULL
;
4528 ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"",
4530 ret_code
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4534 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
4535 snapshot_output
->max_size
);
4536 if (nb_packets_per_stream
< 0) {
4537 ret_code
= LTTNG_ERR_MAX_SIZE_INVALID
;
4541 if (session
->kernel_session
) {
4542 ret_code
= record_kernel_snapshot(session
->kernel_session
,
4543 snapshot_kernel_consumer_output
, session
,
4544 wait
, nb_packets_per_stream
);
4545 if (ret_code
!= LTTNG_OK
) {
4550 if (session
->ust_session
) {
4551 ret_code
= record_ust_snapshot(session
->ust_session
,
4552 snapshot_ust_consumer_output
, session
,
4553 wait
, nb_packets_per_stream
);
4554 if (ret_code
!= LTTNG_OK
) {
4559 if (session_close_trace_chunk(
4560 session
, session
->current_trace_chunk
, NULL
)) {
4562 * Don't goto end; make sure the chunk is closed for the session
4563 * to allow future snapshots.
4565 ERR("Failed to close snapshot trace chunk of session \"%s\"",
4567 ret_code
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
4569 if (session_set_trace_chunk(session
, NULL
, NULL
)) {
4570 ERR("Failed to release the current trace chunk of session \"%s\"",
4572 ret_code
= LTTNG_ERR_UNK
;
4575 if (original_ust_consumer_output
) {
4576 session
->ust_session
->consumer
= original_ust_consumer_output
;
4578 if (original_kernel_consumer_output
) {
4579 session
->kernel_session
->consumer
=
4580 original_kernel_consumer_output
;
4582 consumer_output_put(snapshot_ust_consumer_output
);
4583 consumer_output_put(snapshot_kernel_consumer_output
);
4588 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
4590 * The wait parameter is ignored so this call always wait for the snapshot to
4591 * complete before returning.
4593 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4595 int cmd_snapshot_record(struct ltt_session
*session
,
4596 struct lttng_snapshot_output
*output
, int wait
)
4598 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4600 unsigned int snapshot_success
= 0;
4602 struct snapshot_output
*tmp_output
= NULL
;
4607 DBG("Cmd snapshot record for session %s", session
->name
);
4609 /* Get the datetime for the snapshot output directory. */
4610 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", datetime
,
4613 cmd_ret
= LTTNG_ERR_INVALID
;
4618 * Permission denied to create an output if the session is not
4619 * set in no output mode.
4621 if (session
->output_traces
) {
4622 cmd_ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
4626 /* The session needs to be started at least once. */
4627 if (!session
->has_been_started
) {
4628 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4632 /* Use temporary output for the session. */
4633 if (*output
->ctrl_url
!= '\0') {
4634 tmp_output
= snapshot_output_alloc();
4636 cmd_ret
= LTTNG_ERR_NOMEM
;
4640 ret
= snapshot_output_init(session
, output
->max_size
,
4642 output
->ctrl_url
, output
->data_url
,
4646 if (ret
== -ENOMEM
) {
4647 cmd_ret
= LTTNG_ERR_NOMEM
;
4649 cmd_ret
= LTTNG_ERR_INVALID
;
4653 /* Use the global session count for the temporary snapshot. */
4654 tmp_output
->nb_snapshot
= session
->snapshot
.nb_snapshot
;
4656 /* Use the global datetime */
4657 memcpy(tmp_output
->datetime
, datetime
, sizeof(datetime
));
4658 cmd_ret
= snapshot_record(session
, tmp_output
, wait
);
4659 if (cmd_ret
!= LTTNG_OK
) {
4662 snapshot_success
= 1;
4664 struct snapshot_output
*sout
;
4665 struct lttng_ht_iter iter
;
4668 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
4669 &iter
.iter
, sout
, node
.node
) {
4670 struct snapshot_output output_copy
;
4673 * Make a local copy of the output and override output
4674 * parameters with those provided as part of the
4677 memcpy(&output_copy
, sout
, sizeof(output_copy
));
4679 if (output
->max_size
!= (uint64_t) -1ULL) {
4680 output_copy
.max_size
= output
->max_size
;
4683 output_copy
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
4684 memcpy(output_copy
.datetime
, datetime
,
4687 /* Use temporary name. */
4688 if (*output
->name
!= '\0') {
4689 if (lttng_strncpy(output_copy
.name
,
4691 sizeof(output_copy
.name
))) {
4692 cmd_ret
= LTTNG_ERR_INVALID
;
4698 cmd_ret
= snapshot_record(session
, &output_copy
, wait
);
4699 if (cmd_ret
!= LTTNG_OK
) {
4703 snapshot_success
= 1;
4708 if (snapshot_success
) {
4709 session
->snapshot
.nb_snapshot
++;
4711 cmd_ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
4716 snapshot_output_destroy(tmp_output
);
4722 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
4724 int cmd_set_session_shm_path(struct ltt_session
*session
,
4725 const char *shm_path
)
4731 * Can only set shm path before session is started.
4733 if (session
->has_been_started
) {
4734 return LTTNG_ERR_SESSION_STARTED
;
4737 strncpy(session
->shm_path
, shm_path
,
4738 sizeof(session
->shm_path
));
4739 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
4745 * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
4747 * Ask the consumer to rotate the session output directory.
4748 * The session lock must be held.
4750 * Returns LTTNG_OK on success or else a negative LTTng error code.
4752 int cmd_rotate_session(struct ltt_session
*session
,
4753 struct lttng_rotate_session_return
*rotate_return
,
4754 bool quiet_rotation
)
4757 uint64_t ongoing_rotation_chunk_id
;
4758 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4759 struct lttng_trace_chunk
*chunk_being_archived
= NULL
;
4760 struct lttng_trace_chunk
*new_trace_chunk
= NULL
;
4761 enum lttng_trace_chunk_status chunk_status
;
4765 if (!session
->has_been_started
) {
4766 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4771 * Explicit rotation is not supported for live sessions.
4772 * However, live sessions can perform a quiet rotation on
4774 * Rotation is not supported for snapshot traces (no output).
4776 if ((!quiet_rotation
&& session
->live_timer
) ||
4777 !session
->output_traces
) {
4778 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
4782 /* Unsupported feature in lttng-relayd before 2.11. */
4783 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
4784 (session
->consumer
->relay_major_version
== 2 &&
4785 session
->consumer
->relay_minor_version
< 11)) {
4786 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY
;
4790 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
4791 DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
4793 cmd_ret
= LTTNG_ERR_ROTATION_PENDING
;
4798 * After a stop, we only allow one rotation to occur, the other ones are
4799 * useless until a new start.
4801 if (session
->rotated_after_last_stop
) {
4802 DBG("Session \"%s\" was already rotated after stop, refusing rotation",
4804 cmd_ret
= LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP
;
4808 session
->rotation_state
= LTTNG_ROTATION_STATE_ONGOING
;
4810 if (session
->active
) {
4811 new_trace_chunk
= session_create_new_trace_chunk(session
, NULL
,
4813 if (!new_trace_chunk
) {
4814 cmd_ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
4819 /* The current trace chunk becomes the chunk being archived. */
4820 ret
= session_set_trace_chunk(session
, new_trace_chunk
,
4821 &chunk_being_archived
);
4823 cmd_ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4827 assert(chunk_being_archived
);
4828 chunk_status
= lttng_trace_chunk_get_id(chunk_being_archived
,
4829 &ongoing_rotation_chunk_id
);
4830 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
4832 if (session
->kernel_session
) {
4833 cmd_ret
= kernel_rotate_session(session
);
4834 if (cmd_ret
!= LTTNG_OK
) {
4838 if (session
->ust_session
) {
4839 cmd_ret
= ust_app_rotate_session(session
);
4840 if (cmd_ret
!= LTTNG_OK
) {
4845 ret
= session_close_trace_chunk(session
, chunk_being_archived
,
4848 &((enum lttng_trace_chunk_command_type
){
4849 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
}));
4851 cmd_ret
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
4855 session
->quiet_rotation
= quiet_rotation
;
4856 ret
= timer_session_rotation_pending_check_start(session
,
4857 DEFAULT_ROTATE_PENDING_TIMER
);
4859 cmd_ret
= LTTNG_ERR_UNK
;
4863 if (!session
->active
) {
4864 session
->rotated_after_last_stop
= true;
4867 if (rotate_return
) {
4868 rotate_return
->rotation_id
= ongoing_rotation_chunk_id
;
4871 session
->chunk_being_archived
= chunk_being_archived
;
4872 chunk_being_archived
= NULL
;
4873 if (!quiet_rotation
) {
4874 ret
= notification_thread_command_session_rotation_ongoing(
4875 notification_thread_handle
,
4876 session
->name
, session
->uid
, session
->gid
,
4877 ongoing_rotation_chunk_id
);
4878 if (ret
!= LTTNG_OK
) {
4879 ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
4885 DBG("Cmd rotate session %s, archive_id %" PRIu64
" sent",
4886 session
->name
, ongoing_rotation_chunk_id
);
4888 lttng_trace_chunk_put(new_trace_chunk
);
4889 lttng_trace_chunk_put(chunk_being_archived
);
4890 ret
= (cmd_ret
== LTTNG_OK
) ? cmd_ret
: -((int) cmd_ret
);
4893 if (session_reset_rotation_state(session
,
4894 LTTNG_ROTATION_STATE_ERROR
)) {
4895 ERR("Failed to reset rotation state of session \"%s\"",
4902 * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
4904 * Check if the session has finished its rotation.
4906 * Return LTTNG_OK on success or else an LTTNG_ERR code.
4908 int cmd_rotate_get_info(struct ltt_session
*session
,
4909 struct lttng_rotation_get_info_return
*info_return
,
4910 uint64_t rotation_id
)
4912 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4913 enum lttng_rotation_state rotation_state
;
4915 DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64
, session
->name
,
4916 session
->most_recent_chunk_id
.value
);
4918 if (session
->chunk_being_archived
) {
4919 enum lttng_trace_chunk_status chunk_status
;
4922 chunk_status
= lttng_trace_chunk_get_id(
4923 session
->chunk_being_archived
,
4925 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
4927 rotation_state
= rotation_id
== chunk_id
?
4928 LTTNG_ROTATION_STATE_ONGOING
:
4929 LTTNG_ROTATION_STATE_EXPIRED
;
4931 if (session
->last_archived_chunk_id
.is_set
&&
4932 rotation_id
!= session
->last_archived_chunk_id
.value
) {
4933 rotation_state
= LTTNG_ROTATION_STATE_EXPIRED
;
4935 rotation_state
= session
->rotation_state
;
4939 switch (rotation_state
) {
4940 case LTTNG_ROTATION_STATE_NO_ROTATION
:
4941 DBG("Reporting that no rotation has occured within the lifetime of session \"%s\"",
4944 case LTTNG_ROTATION_STATE_EXPIRED
:
4945 DBG("Reporting that the rotation state of rotation id %" PRIu64
" of session \"%s\" has expired",
4946 rotation_id
, session
->name
);
4948 case LTTNG_ROTATION_STATE_ONGOING
:
4949 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is still pending",
4950 rotation_id
, session
->name
);
4952 case LTTNG_ROTATION_STATE_COMPLETED
:
4956 char *current_tracing_path_reply
;
4957 size_t current_tracing_path_reply_len
;
4959 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is completed",
4960 rotation_id
, session
->name
);
4962 switch (session_get_consumer_destination_type(session
)) {
4963 case CONSUMER_DST_LOCAL
:
4964 current_tracing_path_reply
=
4965 info_return
->location
.local
.absolute_path
;
4966 current_tracing_path_reply_len
=
4967 sizeof(info_return
->location
.local
.absolute_path
);
4968 info_return
->location_type
=
4969 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL
;
4971 case CONSUMER_DST_NET
:
4972 current_tracing_path_reply
=
4973 info_return
->location
.relay
.relative_path
;
4974 current_tracing_path_reply_len
=
4975 sizeof(info_return
->location
.relay
.relative_path
);
4976 /* Currently the only supported relay protocol. */
4977 info_return
->location
.relay
.protocol
=
4978 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP
;
4980 fmt_ret
= lttng_strncpy(info_return
->location
.relay
.host
,
4981 session_get_net_consumer_hostname(session
),
4982 sizeof(info_return
->location
.relay
.host
));
4984 ERR("Failed to copy host name to rotate_get_info reply");
4985 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
4986 cmd_ret
= LTTNG_ERR_SET_URL
;
4990 session_get_net_consumer_ports(session
,
4991 &info_return
->location
.relay
.ports
.control
,
4992 &info_return
->location
.relay
.ports
.data
);
4993 info_return
->location_type
=
4994 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY
;
4999 fmt_ret
= asprintf(&chunk_path
,
5000 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
"/%s",
5001 session_get_base_path(session
),
5002 session
->last_archived_chunk_name
);
5003 if (fmt_ret
== -1) {
5004 PERROR("Failed to format the path of the last archived trace chunk");
5005 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5006 cmd_ret
= LTTNG_ERR_UNK
;
5010 fmt_ret
= lttng_strncpy(current_tracing_path_reply
,
5011 chunk_path
, current_tracing_path_reply_len
);
5014 ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply");
5015 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5016 cmd_ret
= LTTNG_ERR_UNK
;
5022 case LTTNG_ROTATION_STATE_ERROR
:
5023 DBG("Reporting that an error occurred during rotation %" PRIu64
" of session \"%s\"",
5024 rotation_id
, session
->name
);
5032 info_return
->status
= (int32_t) rotation_state
;
5037 * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
5039 * Configure the automatic rotation parameters.
5040 * 'activate' to true means activate the rotation schedule type with 'new_value'.
5041 * 'activate' to false means deactivate the rotation schedule and validate that
5042 * 'new_value' has the same value as the currently active value.
5044 * Return 0 on success or else a positive LTTNG_ERR code.
5046 int cmd_rotation_set_schedule(struct ltt_session
*session
,
5047 bool activate
, enum lttng_rotation_schedule_type schedule_type
,
5049 struct notification_thread_handle
*notification_thread_handle
)
5052 uint64_t *parameter_value
;
5056 DBG("Cmd rotate set schedule session %s", session
->name
);
5058 if (session
->live_timer
|| !session
->output_traces
) {
5059 DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
5060 ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
5064 switch (schedule_type
) {
5065 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5066 parameter_value
= &session
->rotate_size
;
5068 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5069 parameter_value
= &session
->rotate_timer_period
;
5070 if (new_value
>= UINT_MAX
) {
5071 DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64
" > %u (UINT_MAX)",
5072 new_value
, UINT_MAX
);
5073 ret
= LTTNG_ERR_INVALID
;
5078 WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
5079 ret
= LTTNG_ERR_INVALID
;
5083 /* Improper use of the API. */
5084 if (new_value
== -1ULL) {
5085 WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
5086 ret
= LTTNG_ERR_INVALID
;
5091 * As indicated in struct ltt_session's comments, a value of == 0 means
5092 * this schedule rotation type is not in use.
5094 * Reject the command if we were asked to activate a schedule that was
5097 if (activate
&& *parameter_value
!= 0) {
5098 DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
5099 ret
= LTTNG_ERR_ROTATION_SCHEDULE_SET
;
5104 * Reject the command if we were asked to deactivate a schedule that was
5107 if (!activate
&& *parameter_value
== 0) {
5108 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
5109 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5114 * Reject the command if we were asked to deactivate a schedule that
5117 if (!activate
&& *parameter_value
!= new_value
) {
5118 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
5119 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5123 *parameter_value
= activate
? new_value
: 0;
5125 switch (schedule_type
) {
5126 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5127 if (activate
&& session
->active
) {
5129 * Only start the timer if the session is active,
5130 * otherwise it will be started when the session starts.
5132 ret
= timer_session_rotation_schedule_timer_start(
5133 session
, new_value
);
5135 ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
5136 ret
= LTTNG_ERR_UNK
;
5140 ret
= timer_session_rotation_schedule_timer_stop(
5143 ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
5144 ret
= LTTNG_ERR_UNK
;
5149 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5151 ret
= subscribe_session_consumed_size_rotation(session
,
5152 new_value
, notification_thread_handle
);
5154 ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
5155 ret
= LTTNG_ERR_UNK
;
5159 ret
= unsubscribe_session_consumed_size_rotation(session
,
5160 notification_thread_handle
);
5162 ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
5163 ret
= LTTNG_ERR_UNK
;
5170 /* Would have been caught before. */
5182 /* Wait for a given path to be removed before continuing. */
5183 static enum lttng_error_code
wait_on_path(void *path_data
)
5185 const char *shm_path
= path_data
;
5187 DBG("Waiting for the shm path at %s to be removed before completing session destruction",
5193 ret
= stat(shm_path
, &st
);
5195 if (errno
!= ENOENT
) {
5196 PERROR("stat() returned an error while checking for the existence of the shm path");
5198 DBG("shm path no longer exists, completing the destruction of session");
5202 if (!S_ISDIR(st
.st_mode
)) {
5203 ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
5208 usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US
);
5214 * Returns a pointer to a handler to run on completion of a command.
5215 * Returns NULL if no handler has to be run for the last command executed.
5217 const struct cmd_completion_handler
*cmd_pop_completion_handler(void)
5219 struct cmd_completion_handler
*handler
= current_completion_handler
;
5221 current_completion_handler
= NULL
;
5226 * Init command subsystem.
5231 * Set network sequence index to 1 for streams to match a relayd
5232 * socket on the consumer side.
5234 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
5235 relayd_net_seq_idx
= 1;
5236 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
5238 DBG("Command subsystem initialized");