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
));
916 ret_code
= LTTNG_ERR_FATAL
;
919 consumer
->type
= CONSUMER_DST_LOCAL
;
929 * Init tracing by creating trace directory and sending fds kernel consumer.
931 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
934 struct lttng_ht_iter iter
;
935 struct consumer_socket
*socket
;
941 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
942 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
944 pthread_mutex_lock(socket
->lock
);
945 ret
= kernel_consumer_send_session(socket
, session
);
946 pthread_mutex_unlock(socket
->lock
);
948 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
960 * Create a socket to the relayd using the URI.
962 * On success, the relayd_sock pointer is set to the created socket.
963 * Else, it remains untouched and an LTTng error code is returned.
965 static enum lttng_error_code
create_connect_relayd(struct lttng_uri
*uri
,
966 struct lttcomm_relayd_sock
**relayd_sock
,
967 struct consumer_output
*consumer
)
970 enum lttng_error_code status
= LTTNG_OK
;
971 struct lttcomm_relayd_sock
*rsock
;
973 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
974 RELAYD_VERSION_COMM_MINOR
);
976 status
= LTTNG_ERR_FATAL
;
981 * Connect to relayd so we can proceed with a session creation. This call
982 * can possibly block for an arbitrary amount of time to set the health
983 * state to be in poll execution.
986 ret
= relayd_connect(rsock
);
989 ERR("Unable to reach lttng-relayd");
990 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
994 /* Create socket for control stream. */
995 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
996 DBG3("Creating relayd stream socket from URI");
998 /* Check relayd version */
999 ret
= relayd_version_check(rsock
);
1000 if (ret
== LTTNG_ERR_RELAYD_VERSION_FAIL
) {
1001 status
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
1003 } else if (ret
< 0) {
1004 ERR("Unable to reach lttng-relayd");
1005 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
1008 consumer
->relay_major_version
= rsock
->major
;
1009 consumer
->relay_minor_version
= rsock
->minor
;
1010 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
1011 DBG3("Creating relayd data socket from URI");
1013 /* Command is not valid */
1014 ERR("Relayd invalid stream type: %d", uri
->stype
);
1015 status
= LTTNG_ERR_INVALID
;
1019 *relayd_sock
= rsock
;
1024 /* The returned value is not useful since we are on an error path. */
1025 (void) relayd_close(rsock
);
1033 * Connect to the relayd using URI and send the socket to the right consumer.
1035 * The consumer socket lock must be held by the caller.
1037 * Returns LTTNG_OK on success or an LTTng error code on failure.
1039 static enum lttng_error_code
send_consumer_relayd_socket(
1040 unsigned int session_id
,
1041 struct lttng_uri
*relayd_uri
,
1042 struct consumer_output
*consumer
,
1043 struct consumer_socket
*consumer_sock
,
1044 const char *session_name
, const char *hostname
,
1045 const char *base_path
, int session_live_timer
,
1046 const uint64_t *current_chunk_id
,
1047 time_t session_creation_time
,
1048 bool session_name_contains_creation_time
)
1051 struct lttcomm_relayd_sock
*rsock
= NULL
;
1052 enum lttng_error_code status
;
1054 /* Connect to relayd and make version check if uri is the control. */
1055 status
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
1056 if (status
!= LTTNG_OK
) {
1057 goto relayd_comm_error
;
1061 /* Set the network sequence index if not set. */
1062 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
1063 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
1065 * Increment net_seq_idx because we are about to transfer the
1066 * new relayd socket to the consumer.
1067 * Assign unique key so the consumer can match streams.
1069 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
1070 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
1073 /* Send relayd socket to consumer. */
1074 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
1075 relayd_uri
->stype
, session_id
,
1076 session_name
, hostname
, base_path
,
1077 session_live_timer
, current_chunk_id
,
1078 session_creation_time
, session_name_contains_creation_time
);
1080 status
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
1084 /* Flag that the corresponding socket was sent. */
1085 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
1086 consumer_sock
->control_sock_sent
= 1;
1087 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
1088 consumer_sock
->data_sock_sent
= 1;
1092 * Close socket which was dup on the consumer side. The session daemon does
1093 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1097 if (status
!= LTTNG_OK
) {
1099 * The consumer output for this session should not be used anymore
1100 * since the relayd connection failed thus making any tracing or/and
1101 * streaming not usable.
1103 consumer
->enabled
= 0;
1105 (void) relayd_close(rsock
);
1113 * Send both relayd sockets to a specific consumer and domain. This is a
1114 * helper function to facilitate sending the information to the consumer for a
1117 * The consumer socket lock must be held by the caller.
1119 * Returns LTTNG_OK, or an LTTng error code on failure.
1121 static enum lttng_error_code
send_consumer_relayd_sockets(
1122 enum lttng_domain_type domain
,
1123 unsigned int session_id
, struct consumer_output
*consumer
,
1124 struct consumer_socket
*sock
, const char *session_name
,
1125 const char *hostname
, const char *base_path
, int session_live_timer
,
1126 const uint64_t *current_chunk_id
, time_t session_creation_time
,
1127 bool session_name_contains_creation_time
)
1129 enum lttng_error_code status
= LTTNG_OK
;
1134 /* Sending control relayd socket. */
1135 if (!sock
->control_sock_sent
) {
1136 status
= send_consumer_relayd_socket(session_id
,
1137 &consumer
->dst
.net
.control
, consumer
, sock
,
1138 session_name
, hostname
, base_path
, session_live_timer
,
1139 current_chunk_id
, session_creation_time
,
1140 session_name_contains_creation_time
);
1141 if (status
!= LTTNG_OK
) {
1146 /* Sending data relayd socket. */
1147 if (!sock
->data_sock_sent
) {
1148 status
= send_consumer_relayd_socket(session_id
,
1149 &consumer
->dst
.net
.data
, consumer
, sock
,
1150 session_name
, hostname
, base_path
, session_live_timer
,
1151 current_chunk_id
, session_creation_time
,
1152 session_name_contains_creation_time
);
1153 if (status
!= LTTNG_OK
) {
1163 * Setup relayd connections for a tracing session. First creates the socket to
1164 * the relayd and send them to the right domain consumer. Consumer type MUST be
1167 int cmd_setup_relayd(struct ltt_session
*session
)
1170 struct ltt_ust_session
*usess
;
1171 struct ltt_kernel_session
*ksess
;
1172 struct consumer_socket
*socket
;
1173 struct lttng_ht_iter iter
;
1174 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
1178 usess
= session
->ust_session
;
1179 ksess
= session
->kernel_session
;
1181 DBG("Setting relayd for session %s", session
->name
);
1183 if (session
->current_trace_chunk
) {
1184 enum lttng_trace_chunk_status status
= lttng_trace_chunk_get_id(
1185 session
->current_trace_chunk
, ¤t_chunk_id
.value
);
1187 if (status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
1188 current_chunk_id
.is_set
= true;
1190 ERR("Failed to get current trace chunk id");
1191 ret
= LTTNG_ERR_UNK
;
1198 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
1199 && usess
->consumer
->enabled
) {
1200 /* For each consumer socket, send relayd sockets */
1201 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1202 socket
, node
.node
) {
1203 pthread_mutex_lock(socket
->lock
);
1204 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1205 usess
->consumer
, socket
,
1206 session
->name
, session
->hostname
,
1208 session
->live_timer
,
1209 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1210 session
->creation_time
,
1211 session
->name_contains_creation_time
);
1212 pthread_mutex_unlock(socket
->lock
);
1213 if (ret
!= LTTNG_OK
) {
1216 /* Session is now ready for network streaming. */
1217 session
->net_handle
= 1;
1219 session
->consumer
->relay_major_version
=
1220 usess
->consumer
->relay_major_version
;
1221 session
->consumer
->relay_minor_version
=
1222 usess
->consumer
->relay_minor_version
;
1225 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1226 && ksess
->consumer
->enabled
) {
1227 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1228 socket
, node
.node
) {
1229 pthread_mutex_lock(socket
->lock
);
1230 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1231 ksess
->consumer
, socket
,
1232 session
->name
, session
->hostname
,
1234 session
->live_timer
,
1235 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1236 session
->creation_time
,
1237 session
->name_contains_creation_time
);
1238 pthread_mutex_unlock(socket
->lock
);
1239 if (ret
!= LTTNG_OK
) {
1242 /* Session is now ready for network streaming. */
1243 session
->net_handle
= 1;
1245 session
->consumer
->relay_major_version
=
1246 ksess
->consumer
->relay_major_version
;
1247 session
->consumer
->relay_minor_version
=
1248 ksess
->consumer
->relay_minor_version
;
1257 * Start a kernel session by opening all necessary streams.
1259 static int start_kernel_session(struct ltt_kernel_session
*ksess
)
1262 struct ltt_kernel_channel
*kchan
;
1264 /* Open kernel metadata */
1265 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1266 ret
= kernel_open_metadata(ksess
);
1268 ret
= LTTNG_ERR_KERN_META_FAIL
;
1273 /* Open kernel metadata stream */
1274 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1275 ret
= kernel_open_metadata_stream(ksess
);
1277 ERR("Kernel create metadata stream failed");
1278 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1283 /* For each channel */
1284 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1285 if (kchan
->stream_count
== 0) {
1286 ret
= kernel_open_channel_stream(kchan
);
1288 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1291 /* Update the stream global counter */
1292 ksess
->stream_count_global
+= ret
;
1296 /* Setup kernel consumer socket and send fds to it */
1297 ret
= init_kernel_tracing(ksess
);
1299 ret
= LTTNG_ERR_KERN_START_FAIL
;
1303 /* This start the kernel tracing */
1304 ret
= kernel_start_session(ksess
);
1306 ret
= LTTNG_ERR_KERN_START_FAIL
;
1310 /* Quiescent wait after starting trace */
1311 kernel_wait_quiescent();
1322 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1324 int cmd_disable_channel(struct ltt_session
*session
,
1325 enum lttng_domain_type domain
, char *channel_name
)
1328 struct ltt_ust_session
*usess
;
1330 usess
= session
->ust_session
;
1335 case LTTNG_DOMAIN_KERNEL
:
1337 ret
= channel_kernel_disable(session
->kernel_session
,
1339 if (ret
!= LTTNG_OK
) {
1343 kernel_wait_quiescent();
1346 case LTTNG_DOMAIN_UST
:
1348 struct ltt_ust_channel
*uchan
;
1349 struct lttng_ht
*chan_ht
;
1351 chan_ht
= usess
->domain_global
.channels
;
1353 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1354 if (uchan
== NULL
) {
1355 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1359 ret
= channel_ust_disable(usess
, uchan
);
1360 if (ret
!= LTTNG_OK
) {
1366 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1378 * Command LTTNG_TRACK_PID processed by the client thread.
1380 * Called with session lock held.
1382 int cmd_track_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1390 case LTTNG_DOMAIN_KERNEL
:
1392 struct ltt_kernel_session
*ksess
;
1394 ksess
= session
->kernel_session
;
1396 ret
= kernel_track_pid(ksess
, pid
);
1397 if (ret
!= LTTNG_OK
) {
1401 kernel_wait_quiescent();
1404 case LTTNG_DOMAIN_UST
:
1406 struct ltt_ust_session
*usess
;
1408 usess
= session
->ust_session
;
1410 ret
= trace_ust_track_pid(usess
, pid
);
1411 if (ret
!= LTTNG_OK
) {
1417 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1429 * Command LTTNG_UNTRACK_PID processed by the client thread.
1431 * Called with session lock held.
1433 int cmd_untrack_pid(struct ltt_session
*session
, enum lttng_domain_type domain
,
1441 case LTTNG_DOMAIN_KERNEL
:
1443 struct ltt_kernel_session
*ksess
;
1445 ksess
= session
->kernel_session
;
1447 ret
= kernel_untrack_pid(ksess
, pid
);
1448 if (ret
!= LTTNG_OK
) {
1452 kernel_wait_quiescent();
1455 case LTTNG_DOMAIN_UST
:
1457 struct ltt_ust_session
*usess
;
1459 usess
= session
->ust_session
;
1461 ret
= trace_ust_untrack_pid(usess
, pid
);
1462 if (ret
!= LTTNG_OK
) {
1468 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1480 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1482 * The wpipe arguments is used as a notifier for the kernel thread.
1484 int cmd_enable_channel(struct ltt_session
*session
,
1485 struct lttng_domain
*domain
, struct lttng_channel
*attr
, int wpipe
)
1488 struct ltt_ust_session
*usess
= session
->ust_session
;
1489 struct lttng_ht
*chan_ht
;
1496 len
= lttng_strnlen(attr
->name
, sizeof(attr
->name
));
1498 /* Validate channel name */
1499 if (attr
->name
[0] == '.' ||
1500 memchr(attr
->name
, '/', len
) != NULL
) {
1501 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1505 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
1510 * Don't try to enable a channel if the session has been started at
1511 * some point in time before. The tracer does not allow it.
1513 if (session
->has_been_started
) {
1514 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1519 * If the session is a live session, remove the switch timer, the
1520 * live timer does the same thing but sends also synchronisation
1521 * beacons for inactive streams.
1523 if (session
->live_timer
> 0) {
1524 attr
->attr
.live_timer_interval
= session
->live_timer
;
1525 attr
->attr
.switch_timer_interval
= 0;
1528 /* Check for feature support */
1529 switch (domain
->type
) {
1530 case LTTNG_DOMAIN_KERNEL
:
1532 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
1533 /* Sampling position of buffer is not supported */
1534 WARN("Kernel tracer does not support buffer monitoring. "
1535 "Setting the monitor interval timer to 0 "
1536 "(disabled) for channel '%s' of session '%s'",
1537 attr
-> name
, session
->name
);
1538 lttng_channel_set_monitor_timer_interval(attr
, 0);
1542 case LTTNG_DOMAIN_UST
:
1544 case LTTNG_DOMAIN_JUL
:
1545 case LTTNG_DOMAIN_LOG4J
:
1546 case LTTNG_DOMAIN_PYTHON
:
1547 if (!agent_tracing_is_enabled()) {
1548 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1549 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
1554 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1558 switch (domain
->type
) {
1559 case LTTNG_DOMAIN_KERNEL
:
1561 struct ltt_kernel_channel
*kchan
;
1563 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
1564 session
->kernel_session
);
1565 if (kchan
== NULL
) {
1566 if (session
->snapshot
.nb_output
> 0 ||
1567 session
->snapshot_mode
) {
1568 /* Enforce mmap output for snapshot sessions. */
1569 attr
->attr
.output
= LTTNG_EVENT_MMAP
;
1571 ret
= channel_kernel_create(session
->kernel_session
, attr
, wpipe
);
1572 if (attr
->name
[0] != '\0') {
1573 session
->kernel_session
->has_non_default_channel
= 1;
1576 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1579 if (ret
!= LTTNG_OK
) {
1583 kernel_wait_quiescent();
1586 case LTTNG_DOMAIN_UST
:
1587 case LTTNG_DOMAIN_JUL
:
1588 case LTTNG_DOMAIN_LOG4J
:
1589 case LTTNG_DOMAIN_PYTHON
:
1591 struct ltt_ust_channel
*uchan
;
1596 * Current agent implementation limitations force us to allow
1597 * only one channel at once in "agent" subdomains. Each
1598 * subdomain has a default channel name which must be strictly
1601 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1602 if (strncmp(attr
->name
, DEFAULT_JUL_CHANNEL_NAME
,
1603 LTTNG_SYMBOL_NAME_LEN
)) {
1604 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1607 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1608 if (strncmp(attr
->name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1609 LTTNG_SYMBOL_NAME_LEN
)) {
1610 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1613 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1614 if (strncmp(attr
->name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1615 LTTNG_SYMBOL_NAME_LEN
)) {
1616 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1621 chan_ht
= usess
->domain_global
.channels
;
1623 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
1624 if (uchan
== NULL
) {
1625 ret
= channel_ust_create(usess
, attr
, domain
->buf_type
);
1626 if (attr
->name
[0] != '\0') {
1627 usess
->has_non_default_channel
= 1;
1630 ret
= channel_ust_enable(usess
, uchan
);
1635 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1639 if (ret
== LTTNG_OK
&& attr
->attr
.output
!= LTTNG_EVENT_MMAP
) {
1640 session
->has_non_mmap_channel
= true;
1649 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1651 int cmd_disable_event(struct ltt_session
*session
,
1652 enum lttng_domain_type domain
, char *channel_name
,
1653 struct lttng_event
*event
)
1658 DBG("Disable event command for event \'%s\'", event
->name
);
1660 event_name
= event
->name
;
1662 /* Error out on unhandled search criteria */
1663 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1664 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1665 ret
= LTTNG_ERR_UNK
;
1672 case LTTNG_DOMAIN_KERNEL
:
1674 struct ltt_kernel_channel
*kchan
;
1675 struct ltt_kernel_session
*ksess
;
1677 ksess
= session
->kernel_session
;
1680 * If a non-default channel has been created in the
1681 * session, explicitely require that -c chan_name needs
1684 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1685 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1689 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1690 if (kchan
== NULL
) {
1691 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1695 switch (event
->type
) {
1696 case LTTNG_EVENT_ALL
:
1697 case LTTNG_EVENT_TRACEPOINT
:
1698 case LTTNG_EVENT_SYSCALL
:
1699 case LTTNG_EVENT_PROBE
:
1700 case LTTNG_EVENT_FUNCTION
:
1701 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1702 if (event_name
[0] == '\0') {
1703 ret
= event_kernel_disable_event(kchan
,
1706 ret
= event_kernel_disable_event(kchan
,
1707 event_name
, event
->type
);
1709 if (ret
!= LTTNG_OK
) {
1714 ret
= LTTNG_ERR_UNK
;
1718 kernel_wait_quiescent();
1721 case LTTNG_DOMAIN_UST
:
1723 struct ltt_ust_channel
*uchan
;
1724 struct ltt_ust_session
*usess
;
1726 usess
= session
->ust_session
;
1728 if (validate_ust_event_name(event_name
)) {
1729 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1734 * If a non-default channel has been created in the
1735 * session, explicitly require that -c chan_name needs
1738 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1739 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1743 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1745 if (uchan
== NULL
) {
1746 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1750 switch (event
->type
) {
1751 case LTTNG_EVENT_ALL
:
1753 * An empty event name means that everything
1754 * should be disabled.
1756 if (event
->name
[0] == '\0') {
1757 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1759 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1762 if (ret
!= LTTNG_OK
) {
1767 ret
= LTTNG_ERR_UNK
;
1771 DBG3("Disable UST event %s in channel %s completed", event_name
,
1775 case LTTNG_DOMAIN_LOG4J
:
1776 case LTTNG_DOMAIN_JUL
:
1777 case LTTNG_DOMAIN_PYTHON
:
1780 struct ltt_ust_session
*usess
= session
->ust_session
;
1784 switch (event
->type
) {
1785 case LTTNG_EVENT_ALL
:
1788 ret
= LTTNG_ERR_UNK
;
1792 agt
= trace_ust_find_agent(usess
, domain
);
1794 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1798 * An empty event name means that everything
1799 * should be disabled.
1801 if (event
->name
[0] == '\0') {
1802 ret
= event_agent_disable_all(usess
, agt
);
1804 ret
= event_agent_disable(usess
, agt
, event_name
);
1806 if (ret
!= LTTNG_OK
) {
1813 ret
= LTTNG_ERR_UND
;
1826 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1828 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1829 char *channel_name
, struct lttng_event_context
*ctx
, int kwpipe
)
1831 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1832 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
1835 * Don't try to add a context if the session has been started at
1836 * some point in time before. The tracer does not allow it and would
1837 * result in a corrupted trace.
1839 if (session
->has_been_started
) {
1840 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1844 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
1845 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
1846 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
1850 case LTTNG_DOMAIN_KERNEL
:
1851 assert(session
->kernel_session
);
1853 if (session
->kernel_session
->channel_count
== 0) {
1854 /* Create default channel */
1855 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
1856 if (ret
!= LTTNG_OK
) {
1859 chan_kern_created
= 1;
1861 /* Add kernel context to kernel tracer */
1862 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
1863 if (ret
!= LTTNG_OK
) {
1867 case LTTNG_DOMAIN_JUL
:
1868 case LTTNG_DOMAIN_LOG4J
:
1871 * Validate channel name.
1872 * If no channel name is given and the domain is JUL or LOG4J,
1873 * set it to the appropriate domain-specific channel name. If
1874 * a name is provided but does not match the expexted channel
1875 * name, return an error.
1877 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
1878 strcmp(channel_name
,
1879 DEFAULT_JUL_CHANNEL_NAME
)) {
1880 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1882 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
1883 strcmp(channel_name
,
1884 DEFAULT_LOG4J_CHANNEL_NAME
)) {
1885 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1888 /* break is _not_ missing here. */
1890 case LTTNG_DOMAIN_UST
:
1892 struct ltt_ust_session
*usess
= session
->ust_session
;
1893 unsigned int chan_count
;
1897 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
1898 if (chan_count
== 0) {
1899 struct lttng_channel
*attr
;
1900 /* Create default channel */
1901 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
1903 ret
= LTTNG_ERR_FATAL
;
1907 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
1908 if (ret
!= LTTNG_OK
) {
1912 channel_attr_destroy(attr
);
1913 chan_ust_created
= 1;
1916 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
1917 free(app_ctx_provider_name
);
1919 app_ctx_name
= NULL
;
1920 app_ctx_provider_name
= NULL
;
1921 if (ret
!= LTTNG_OK
) {
1927 ret
= LTTNG_ERR_UND
;
1935 if (chan_kern_created
) {
1936 struct ltt_kernel_channel
*kchan
=
1937 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
1938 session
->kernel_session
);
1939 /* Created previously, this should NOT fail. */
1941 kernel_destroy_channel(kchan
);
1944 if (chan_ust_created
) {
1945 struct ltt_ust_channel
*uchan
=
1946 trace_ust_find_channel_by_name(
1947 session
->ust_session
->domain_global
.channels
,
1948 DEFAULT_CHANNEL_NAME
);
1949 /* Created previously, this should NOT fail. */
1951 /* Remove from the channel list of the session. */
1952 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
1954 trace_ust_destroy_channel(uchan
);
1957 free(app_ctx_provider_name
);
1962 static inline bool name_starts_with(const char *name
, const char *prefix
)
1964 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
1966 return !strncmp(name
, prefix
, max_cmp_len
);
1969 /* Perform userspace-specific event name validation */
1970 static int validate_ust_event_name(const char *name
)
1980 * Check name against all internal UST event component namespaces used
1983 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
1984 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
1985 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
1994 * Internal version of cmd_enable_event() with a supplemental
1995 * "internal_event" flag which is used to enable internal events which should
1996 * be hidden from clients. Such events are used in the agent implementation to
1997 * enable the events through which all "agent" events are funeled.
1999 static int _cmd_enable_event(struct ltt_session
*session
,
2000 struct lttng_domain
*domain
,
2001 char *channel_name
, struct lttng_event
*event
,
2002 char *filter_expression
,
2003 struct lttng_filter_bytecode
*filter
,
2004 struct lttng_event_exclusion
*exclusion
,
2005 int wpipe
, bool internal_event
)
2007 int ret
= 0, channel_created
= 0;
2008 struct lttng_channel
*attr
= NULL
;
2012 assert(channel_name
);
2014 /* If we have a filter, we must have its filter expression */
2015 assert(!(!!filter_expression
^ !!filter
));
2017 /* Normalize event name as a globbing pattern */
2018 strutils_normalize_star_glob_pattern(event
->name
);
2020 /* Normalize exclusion names as globbing patterns */
2024 for (i
= 0; i
< exclusion
->count
; i
++) {
2025 char *name
= LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion
, i
);
2027 strutils_normalize_star_glob_pattern(name
);
2031 DBG("Enable event command for event \'%s\'", event
->name
);
2035 switch (domain
->type
) {
2036 case LTTNG_DOMAIN_KERNEL
:
2038 struct ltt_kernel_channel
*kchan
;
2041 * If a non-default channel has been created in the
2042 * session, explicitely require that -c chan_name needs
2045 if (session
->kernel_session
->has_non_default_channel
2046 && channel_name
[0] == '\0') {
2047 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2051 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2052 session
->kernel_session
);
2053 if (kchan
== NULL
) {
2054 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
2055 LTTNG_BUFFER_GLOBAL
);
2057 ret
= LTTNG_ERR_FATAL
;
2060 if (lttng_strncpy(attr
->name
, channel_name
,
2061 sizeof(attr
->name
))) {
2062 ret
= LTTNG_ERR_INVALID
;
2066 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2067 if (ret
!= LTTNG_OK
) {
2070 channel_created
= 1;
2073 /* Get the newly created kernel channel pointer */
2074 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2075 session
->kernel_session
);
2076 if (kchan
== NULL
) {
2077 /* This sould not happen... */
2078 ret
= LTTNG_ERR_FATAL
;
2082 switch (event
->type
) {
2083 case LTTNG_EVENT_ALL
:
2085 char *filter_expression_a
= NULL
;
2086 struct lttng_filter_bytecode
*filter_a
= NULL
;
2089 * We need to duplicate filter_expression and filter,
2090 * because ownership is passed to first enable
2093 if (filter_expression
) {
2094 filter_expression_a
= strdup(filter_expression
);
2095 if (!filter_expression_a
) {
2096 ret
= LTTNG_ERR_FATAL
;
2101 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
2103 free(filter_expression_a
);
2104 ret
= LTTNG_ERR_FATAL
;
2107 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
2109 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
2110 ret
= event_kernel_enable_event(kchan
, event
,
2111 filter_expression
, filter
);
2112 /* We have passed ownership */
2113 filter_expression
= NULL
;
2115 if (ret
!= LTTNG_OK
) {
2116 if (channel_created
) {
2117 /* Let's not leak a useless channel. */
2118 kernel_destroy_channel(kchan
);
2120 free(filter_expression_a
);
2124 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
2125 ret
= event_kernel_enable_event(kchan
, event
,
2126 filter_expression_a
, filter_a
);
2127 /* We have passed ownership */
2128 filter_expression_a
= NULL
;
2130 if (ret
!= LTTNG_OK
) {
2135 case LTTNG_EVENT_PROBE
:
2136 case LTTNG_EVENT_USERSPACE_PROBE
:
2137 case LTTNG_EVENT_FUNCTION
:
2138 case LTTNG_EVENT_FUNCTION_ENTRY
:
2139 case LTTNG_EVENT_TRACEPOINT
:
2140 ret
= event_kernel_enable_event(kchan
, event
,
2141 filter_expression
, filter
);
2142 /* We have passed ownership */
2143 filter_expression
= NULL
;
2145 if (ret
!= LTTNG_OK
) {
2146 if (channel_created
) {
2147 /* Let's not leak a useless channel. */
2148 kernel_destroy_channel(kchan
);
2153 case LTTNG_EVENT_SYSCALL
:
2154 ret
= event_kernel_enable_event(kchan
, event
,
2155 filter_expression
, filter
);
2156 /* We have passed ownership */
2157 filter_expression
= NULL
;
2159 if (ret
!= LTTNG_OK
) {
2164 ret
= LTTNG_ERR_UNK
;
2168 kernel_wait_quiescent();
2171 case LTTNG_DOMAIN_UST
:
2173 struct ltt_ust_channel
*uchan
;
2174 struct ltt_ust_session
*usess
= session
->ust_session
;
2179 * If a non-default channel has been created in the
2180 * session, explicitely require that -c chan_name needs
2183 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
2184 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2188 /* Get channel from global UST domain */
2189 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2191 if (uchan
== NULL
) {
2192 /* Create default channel */
2193 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
2194 usess
->buffer_type
);
2196 ret
= LTTNG_ERR_FATAL
;
2199 if (lttng_strncpy(attr
->name
, channel_name
,
2200 sizeof(attr
->name
))) {
2201 ret
= LTTNG_ERR_INVALID
;
2205 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2206 if (ret
!= LTTNG_OK
) {
2210 /* Get the newly created channel reference back */
2211 uchan
= trace_ust_find_channel_by_name(
2212 usess
->domain_global
.channels
, channel_name
);
2216 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
2218 * Don't allow users to add UST events to channels which
2219 * are assigned to a userspace subdomain (JUL, Log4J,
2222 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
2226 if (!internal_event
) {
2228 * Ensure the event name is not reserved for internal
2231 ret
= validate_ust_event_name(event
->name
);
2233 WARN("Userspace event name %s failed validation.",
2235 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2240 /* At this point, the session and channel exist on the tracer */
2241 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2242 filter_expression
, filter
, exclusion
,
2244 /* We have passed ownership */
2245 filter_expression
= NULL
;
2248 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2249 goto already_enabled
;
2250 } else if (ret
!= LTTNG_OK
) {
2255 case LTTNG_DOMAIN_LOG4J
:
2256 case LTTNG_DOMAIN_JUL
:
2257 case LTTNG_DOMAIN_PYTHON
:
2259 const char *default_event_name
, *default_chan_name
;
2261 struct lttng_event uevent
;
2262 struct lttng_domain tmp_dom
;
2263 struct ltt_ust_session
*usess
= session
->ust_session
;
2267 if (!agent_tracing_is_enabled()) {
2268 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2269 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
2273 agt
= trace_ust_find_agent(usess
, domain
->type
);
2275 agt
= agent_create(domain
->type
);
2277 ret
= LTTNG_ERR_NOMEM
;
2280 agent_add(agt
, usess
->agents
);
2283 /* Create the default tracepoint. */
2284 memset(&uevent
, 0, sizeof(uevent
));
2285 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2286 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2287 default_event_name
= event_get_default_agent_ust_name(
2289 if (!default_event_name
) {
2290 ret
= LTTNG_ERR_FATAL
;
2293 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2294 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2297 * The domain type is changed because we are about to enable the
2298 * default channel and event for the JUL domain that are hardcoded.
2299 * This happens in the UST domain.
2301 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2302 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2304 switch (domain
->type
) {
2305 case LTTNG_DOMAIN_LOG4J
:
2306 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2308 case LTTNG_DOMAIN_JUL
:
2309 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2311 case LTTNG_DOMAIN_PYTHON
:
2312 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2315 /* The switch/case we are in makes this impossible */
2320 char *filter_expression_copy
= NULL
;
2321 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2324 const size_t filter_size
= sizeof(
2325 struct lttng_filter_bytecode
)
2328 filter_copy
= zmalloc(filter_size
);
2330 ret
= LTTNG_ERR_NOMEM
;
2333 memcpy(filter_copy
, filter
, filter_size
);
2335 filter_expression_copy
=
2336 strdup(filter_expression
);
2337 if (!filter_expression
) {
2338 ret
= LTTNG_ERR_NOMEM
;
2341 if (!filter_expression_copy
|| !filter_copy
) {
2342 free(filter_expression_copy
);
2348 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2349 (char *) default_chan_name
,
2350 &uevent
, filter_expression_copy
,
2351 filter_copy
, NULL
, wpipe
);
2354 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2355 goto already_enabled
;
2356 } else if (ret
!= LTTNG_OK
) {
2360 /* The wild card * means that everything should be enabled. */
2361 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2362 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2365 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2369 filter_expression
= NULL
;
2370 if (ret
!= LTTNG_OK
) {
2377 ret
= LTTNG_ERR_UND
;
2385 free(filter_expression
);
2388 channel_attr_destroy(attr
);
2394 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2395 * We own filter, exclusion, and filter_expression.
2397 int cmd_enable_event(struct ltt_session
*session
, struct lttng_domain
*domain
,
2398 char *channel_name
, struct lttng_event
*event
,
2399 char *filter_expression
,
2400 struct lttng_filter_bytecode
*filter
,
2401 struct lttng_event_exclusion
*exclusion
,
2404 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2405 filter_expression
, filter
, exclusion
, wpipe
, false);
2409 * Enable an event which is internal to LTTng. An internal should
2410 * never be made visible to clients and are immune to checks such as
2413 static int cmd_enable_event_internal(struct ltt_session
*session
,
2414 struct lttng_domain
*domain
,
2415 char *channel_name
, struct lttng_event
*event
,
2416 char *filter_expression
,
2417 struct lttng_filter_bytecode
*filter
,
2418 struct lttng_event_exclusion
*exclusion
,
2421 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2422 filter_expression
, filter
, exclusion
, wpipe
, true);
2426 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2428 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2429 struct lttng_event
**events
)
2432 ssize_t nb_events
= 0;
2435 case LTTNG_DOMAIN_KERNEL
:
2436 nb_events
= kernel_list_events(events
);
2437 if (nb_events
< 0) {
2438 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2442 case LTTNG_DOMAIN_UST
:
2443 nb_events
= ust_app_list_events(events
);
2444 if (nb_events
< 0) {
2445 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2449 case LTTNG_DOMAIN_LOG4J
:
2450 case LTTNG_DOMAIN_JUL
:
2451 case LTTNG_DOMAIN_PYTHON
:
2452 nb_events
= agent_list_events(events
, domain
);
2453 if (nb_events
< 0) {
2454 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2459 ret
= LTTNG_ERR_UND
;
2466 /* Return negative value to differentiate return code */
2471 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2473 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2474 struct lttng_event_field
**fields
)
2477 ssize_t nb_fields
= 0;
2480 case LTTNG_DOMAIN_UST
:
2481 nb_fields
= ust_app_list_event_fields(fields
);
2482 if (nb_fields
< 0) {
2483 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2487 case LTTNG_DOMAIN_KERNEL
:
2488 default: /* fall-through */
2489 ret
= LTTNG_ERR_UND
;
2496 /* Return negative value to differentiate return code */
2500 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2502 return syscall_table_list(events
);
2506 * Command LTTNG_LIST_TRACKER_PIDS processed by the client thread.
2508 * Called with session lock held.
2510 ssize_t
cmd_list_tracker_pids(struct ltt_session
*session
,
2511 enum lttng_domain_type domain
, int32_t **pids
)
2514 ssize_t nr_pids
= 0;
2517 case LTTNG_DOMAIN_KERNEL
:
2519 struct ltt_kernel_session
*ksess
;
2521 ksess
= session
->kernel_session
;
2522 nr_pids
= kernel_list_tracker_pids(ksess
, pids
);
2524 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2529 case LTTNG_DOMAIN_UST
:
2531 struct ltt_ust_session
*usess
;
2533 usess
= session
->ust_session
;
2534 nr_pids
= trace_ust_list_tracker_pids(usess
, pids
);
2536 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2541 case LTTNG_DOMAIN_LOG4J
:
2542 case LTTNG_DOMAIN_JUL
:
2543 case LTTNG_DOMAIN_PYTHON
:
2545 ret
= LTTNG_ERR_UND
;
2552 /* Return negative value to differentiate return code */
2557 * Command LTTNG_START_TRACE processed by the client thread.
2559 * Called with session mutex held.
2561 int cmd_start_trace(struct ltt_session
*session
)
2563 enum lttng_error_code ret
;
2564 unsigned long nb_chan
= 0;
2565 struct ltt_kernel_session
*ksession
;
2566 struct ltt_ust_session
*usess
;
2570 /* Ease our life a bit ;) */
2571 ksession
= session
->kernel_session
;
2572 usess
= session
->ust_session
;
2574 /* Is the session already started? */
2575 if (session
->active
) {
2576 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2581 * Starting a session without channel is useless since after that it's not
2582 * possible to enable channel thus inform the client.
2584 if (usess
&& usess
->domain_global
.channels
) {
2585 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2588 nb_chan
+= ksession
->channel_count
;
2591 ret
= LTTNG_ERR_NO_CHANNEL
;
2595 if (session
->output_traces
&& !session
->current_trace_chunk
) {
2596 struct lttng_trace_chunk
*trace_chunk
;
2598 trace_chunk
= session_create_new_trace_chunk(
2599 session
, NULL
, NULL
, NULL
);
2601 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
2604 assert(!session
->current_trace_chunk
);
2605 ret
= session_set_trace_chunk(session
, trace_chunk
, NULL
);
2606 lttng_trace_chunk_put(trace_chunk
);
2608 ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
2613 /* Kernel tracing */
2614 if (ksession
!= NULL
) {
2615 DBG("Start kernel tracing session %s", session
->name
);
2616 ret
= start_kernel_session(ksession
);
2617 if (ret
!= LTTNG_OK
) {
2622 /* Flag session that trace should start automatically */
2624 int int_ret
= ust_app_start_trace_all(usess
);
2627 ret
= LTTNG_ERR_UST_START_FAIL
;
2632 /* Flag this after a successful start. */
2633 session
->has_been_started
= 1;
2634 session
->active
= 1;
2637 * Clear the flag that indicates that a rotation was done while the
2638 * session was stopped.
2640 session
->rotated_after_last_stop
= false;
2642 if (session
->rotate_timer_period
) {
2643 int int_ret
= timer_session_rotation_schedule_timer_start(
2644 session
, session
->rotate_timer_period
);
2647 ERR("Failed to enable rotate timer");
2648 ret
= LTTNG_ERR_UNK
;
2660 * Command LTTNG_STOP_TRACE processed by the client thread.
2662 int cmd_stop_trace(struct ltt_session
*session
)
2665 struct ltt_kernel_channel
*kchan
;
2666 struct ltt_kernel_session
*ksession
;
2667 struct ltt_ust_session
*usess
;
2668 bool error_occurred
= false;
2672 DBG("Begin stop session %s (id %" PRIu64
")", session
->name
, session
->id
);
2674 ksession
= session
->kernel_session
;
2675 usess
= session
->ust_session
;
2677 /* Session is not active. Skip everythong and inform the client. */
2678 if (!session
->active
) {
2679 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2684 if (ksession
&& ksession
->active
) {
2685 DBG("Stop kernel tracing");
2687 ret
= kernel_stop_session(ksession
);
2689 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
2693 kernel_wait_quiescent();
2695 /* Flush metadata after stopping (if exists) */
2696 if (ksession
->metadata_stream_fd
>= 0) {
2697 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2699 ERR("Kernel metadata flush failed");
2700 error_occurred
= true;
2704 /* Flush all buffers after stopping */
2705 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2706 ret
= kernel_flush_buffer(kchan
);
2708 ERR("Kernel flush buffer error");
2709 error_occurred
= true;
2713 ksession
->active
= 0;
2714 DBG("Kernel session stopped %s (id %" PRIu64
")", session
->name
,
2718 if (usess
&& usess
->active
) {
2719 ret
= ust_app_stop_trace_all(usess
);
2721 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2726 /* Flag inactive after a successful stop. */
2727 session
->active
= 0;
2728 ret
= !error_occurred
? LTTNG_OK
: LTTNG_ERR_UNK
;
2735 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2737 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2738 struct lttng_uri
*uris
)
2741 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2742 struct ltt_ust_session
*usess
= session
->ust_session
;
2748 /* Can't set consumer URI if the session is active. */
2749 if (session
->active
) {
2750 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2754 /* Set the "global" consumer URIs */
2755 for (i
= 0; i
< nb_uri
; i
++) {
2756 ret
= add_uri_to_consumer(session
,
2758 &uris
[i
], LTTNG_DOMAIN_NONE
);
2759 if (ret
!= LTTNG_OK
) {
2764 /* Set UST session URIs */
2765 if (session
->ust_session
) {
2766 for (i
= 0; i
< nb_uri
; i
++) {
2767 ret
= add_uri_to_consumer(session
,
2768 session
->ust_session
->consumer
,
2769 &uris
[i
], LTTNG_DOMAIN_UST
);
2770 if (ret
!= LTTNG_OK
) {
2776 /* Set kernel session URIs */
2777 if (session
->kernel_session
) {
2778 for (i
= 0; i
< nb_uri
; i
++) {
2779 ret
= add_uri_to_consumer(session
,
2780 session
->kernel_session
->consumer
,
2781 &uris
[i
], LTTNG_DOMAIN_KERNEL
);
2782 if (ret
!= LTTNG_OK
) {
2789 * Make sure to set the session in output mode after we set URI since a
2790 * session can be created without URL (thus flagged in no output mode).
2792 session
->output_traces
= 1;
2794 ksess
->output_traces
= 1;
2798 usess
->output_traces
= 1;
2809 enum lttng_error_code
set_session_output_from_descriptor(
2810 struct ltt_session
*session
,
2811 const struct lttng_session_descriptor
*descriptor
)
2814 enum lttng_error_code ret_code
= LTTNG_OK
;
2815 enum lttng_session_descriptor_type session_type
=
2816 lttng_session_descriptor_get_type(descriptor
);
2817 enum lttng_session_descriptor_output_type output_type
=
2818 lttng_session_descriptor_get_output_type(descriptor
);
2819 struct lttng_uri uris
[2] = {};
2820 size_t uri_count
= 0;
2822 switch (output_type
) {
2823 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE
:
2825 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL
:
2826 lttng_session_descriptor_get_local_output_uri(descriptor
,
2830 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK
:
2831 lttng_session_descriptor_get_network_output_uris(descriptor
,
2832 &uris
[0], &uris
[1]);
2836 ret_code
= LTTNG_ERR_INVALID
;
2840 switch (session_type
) {
2841 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
2843 struct snapshot_output
*new_output
= NULL
;
2845 new_output
= snapshot_output_alloc();
2847 ret_code
= LTTNG_ERR_NOMEM
;
2851 ret
= snapshot_output_init_with_uri(session
,
2852 DEFAULT_SNAPSHOT_MAX_SIZE
,
2853 NULL
, uris
, uri_count
, session
->consumer
,
2854 new_output
, &session
->snapshot
);
2856 ret_code
= (ret
== -ENOMEM
) ?
2857 LTTNG_ERR_NOMEM
: LTTNG_ERR_INVALID
;
2858 snapshot_output_destroy(new_output
);
2861 snapshot_add_output(&session
->snapshot
, new_output
);
2864 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR
:
2865 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
2867 ret_code
= cmd_set_consumer_uri(session
, uri_count
, uris
);
2871 ret_code
= LTTNG_ERR_INVALID
;
2879 enum lttng_error_code
cmd_create_session_from_descriptor(
2880 struct lttng_session_descriptor
*descriptor
,
2881 const lttng_sock_cred
*creds
,
2882 const char *home_path
)
2885 enum lttng_error_code ret_code
;
2886 const char *session_name
;
2887 struct ltt_session
*new_session
= NULL
;
2888 enum lttng_session_descriptor_status descriptor_status
;
2889 const char *base_path
;
2891 session_lock_list();
2893 if (*home_path
!= '/') {
2894 ERR("Home path provided by client is not absolute");
2895 ret_code
= LTTNG_ERR_INVALID
;
2900 descriptor_status
= lttng_session_descriptor_get_session_name(
2901 descriptor
, &session_name
);
2902 switch (descriptor_status
) {
2903 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK
:
2905 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET
:
2906 session_name
= NULL
;
2909 ret_code
= LTTNG_ERR_INVALID
;
2912 ret
= lttng_session_descriptor_get_base_path(descriptor
, &base_path
);
2914 ret_code
= LTTNG_ERR_INVALID
;
2917 ret_code
= session_create(session_name
, creds
->uid
, creds
->gid
,
2918 base_path
, &new_session
);
2919 if (ret_code
!= LTTNG_OK
) {
2923 if (!session_name
) {
2924 ret
= lttng_session_descriptor_set_session_name(descriptor
,
2927 ret_code
= LTTNG_ERR_SESSION_FAIL
;
2932 if (!lttng_session_descriptor_is_output_destination_initialized(
2935 * Only include the session's creation time in the output
2936 * destination if the name of the session itself was
2937 * not auto-generated.
2939 ret_code
= lttng_session_descriptor_set_default_output(
2941 session_name
? &new_session
->creation_time
: NULL
,
2943 if (ret_code
!= LTTNG_OK
) {
2947 new_session
->has_user_specified_directory
=
2948 lttng_session_descriptor_has_output_directory(
2952 switch (lttng_session_descriptor_get_type(descriptor
)) {
2953 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
2954 new_session
->snapshot_mode
= 1;
2956 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
2957 new_session
->live_timer
=
2958 lttng_session_descriptor_live_get_timer_interval(
2965 ret_code
= set_session_output_from_descriptor(new_session
, descriptor
);
2966 if (ret_code
!= LTTNG_OK
) {
2969 new_session
->consumer
->enabled
= 1;
2970 ret_code
= LTTNG_OK
;
2972 /* Release reference provided by the session_create function. */
2973 session_put(new_session
);
2974 if (ret_code
!= LTTNG_OK
&& new_session
) {
2975 /* Release the global reference on error. */
2976 session_destroy(new_session
);
2978 session_unlock_list();
2982 enum lttng_error_code
cmd_create_session(struct command_ctx
*cmd_ctx
, int sock
,
2983 struct lttng_session_descriptor
**return_descriptor
)
2986 size_t payload_size
;
2987 struct lttng_dynamic_buffer payload
;
2988 struct lttng_buffer_view home_dir_view
;
2989 struct lttng_buffer_view session_descriptor_view
;
2990 struct lttng_session_descriptor
*session_descriptor
= NULL
;
2991 enum lttng_error_code ret_code
;
2993 lttng_dynamic_buffer_init(&payload
);
2994 if (cmd_ctx
->lsm
->u
.create_session
.home_dir_size
>=
2996 ret_code
= LTTNG_ERR_INVALID
;
2999 if (cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
>
3000 LTTNG_SESSION_DESCRIPTOR_MAX_LEN
) {
3001 ret_code
= LTTNG_ERR_INVALID
;
3005 payload_size
= cmd_ctx
->lsm
->u
.create_session
.home_dir_size
+
3006 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
;
3007 ret
= lttng_dynamic_buffer_set_size(&payload
, payload_size
);
3009 ret_code
= LTTNG_ERR_NOMEM
;
3013 ret
= lttcomm_recv_unix_sock(sock
, payload
.data
, payload
.size
);
3015 ERR("Reception of session descriptor failed, aborting.");
3016 ret_code
= LTTNG_ERR_SESSION_FAIL
;
3020 home_dir_view
= lttng_buffer_view_from_dynamic_buffer(
3023 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
);
3024 session_descriptor_view
= lttng_buffer_view_from_dynamic_buffer(
3026 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
,
3027 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
);
3029 ret
= lttng_session_descriptor_create_from_buffer(
3030 &session_descriptor_view
, &session_descriptor
);
3032 ERR("Failed to create session descriptor from payload of \"create session\" command");
3033 ret_code
= LTTNG_ERR_INVALID
;
3038 * Sets the descriptor's auto-generated properties (name, output) if
3041 ret_code
= cmd_create_session_from_descriptor(session_descriptor
,
3043 home_dir_view
.size
? home_dir_view
.data
: NULL
);
3044 if (ret_code
!= LTTNG_OK
) {
3048 ret_code
= LTTNG_OK
;
3049 *return_descriptor
= session_descriptor
;
3050 session_descriptor
= NULL
;
3052 lttng_dynamic_buffer_reset(&payload
);
3053 lttng_session_descriptor_destroy(session_descriptor
);
3058 void cmd_destroy_session_reply(const struct ltt_session
*session
,
3059 void *_reply_context
)
3063 const struct cmd_destroy_session_reply_context
*reply_context
=
3065 struct lttng_dynamic_buffer payload
;
3066 struct lttcomm_session_destroy_command_header cmd_header
;
3067 struct lttng_trace_archive_location
*location
= NULL
;
3068 struct lttcomm_lttng_msg llm
= {
3069 .cmd_type
= LTTNG_DESTROY_SESSION
,
3070 .ret_code
= LTTNG_OK
,
3073 sizeof(struct lttcomm_session_destroy_command_header
),
3076 size_t payload_size_before_location
;
3078 lttng_dynamic_buffer_init(&payload
);
3080 ret
= lttng_dynamic_buffer_append(&payload
, &llm
, sizeof(llm
));
3082 ERR("Failed to append session destruction message");
3086 cmd_header
.rotation_state
=
3087 (int32_t) (reply_context
->implicit_rotation_on_destroy
?
3088 session
->rotation_state
:
3089 LTTNG_ROTATION_STATE_NO_ROTATION
);
3090 ret
= lttng_dynamic_buffer_append(&payload
, &cmd_header
,
3091 sizeof(cmd_header
));
3093 ERR("Failed to append session destruction command header");
3097 if (!reply_context
->implicit_rotation_on_destroy
) {
3098 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3102 if (session
->rotation_state
!= LTTNG_ROTATION_STATE_COMPLETED
) {
3103 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3108 location
= session_get_trace_archive_location(session
);
3110 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3115 payload_size_before_location
= payload
.size
;
3116 comm_ret
= lttng_trace_archive_location_serialize(location
,
3119 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3123 /* Update the message to indicate the location's length. */
3124 ((struct lttcomm_lttng_msg
*) payload
.data
)->data_size
=
3125 payload
.size
- payload_size_before_location
;
3127 comm_ret
= lttcomm_send_unix_sock(reply_context
->reply_sock_fd
,
3128 payload
.data
, payload
.size
);
3129 if (comm_ret
!= (ssize_t
) payload
.size
) {
3130 ERR("Failed to send result of the destruction of session \"%s\" to client",
3134 ret
= close(reply_context
->reply_sock_fd
);
3136 PERROR("Failed to close client socket in deferred session destroy reply");
3138 lttng_dynamic_buffer_reset(&payload
);
3139 free(_reply_context
);
3143 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3145 * Called with session lock held.
3147 int cmd_destroy_session(struct ltt_session
*session
,
3148 struct notification_thread_handle
*notification_thread_handle
,
3152 struct cmd_destroy_session_reply_context
*reply_context
= NULL
;
3155 reply_context
= zmalloc(sizeof(*reply_context
));
3156 if (!reply_context
) {
3157 ret
= LTTNG_ERR_NOMEM
;
3160 reply_context
->reply_sock_fd
= *sock_fd
;
3166 DBG("Begin destroy session %s (id %" PRIu64
")", session
->name
,
3168 if (session
->active
) {
3169 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3171 ret
= cmd_stop_trace(session
);
3172 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
3173 /* Carry on with the destruction of the session. */
3174 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3175 session
->name
, lttng_strerror(-ret
));
3179 if (session
->rotation_schedule_timer_enabled
) {
3180 if (timer_session_rotation_schedule_timer_stop(
3182 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3187 if (session
->rotate_size
) {
3188 unsubscribe_session_consumed_size_rotation(session
, notification_thread_handle
);
3189 session
->rotate_size
= 0;
3192 if (session
->most_recent_chunk_id
.is_set
&&
3193 session
->most_recent_chunk_id
.value
!= 0 &&
3194 session
->current_trace_chunk
&& session
->output_traces
) {
3196 * Perform a last rotation on destruction if rotations have
3197 * occurred during the session's lifetime.
3199 ret
= cmd_rotate_session(session
, NULL
, false);
3200 if (ret
!= LTTNG_OK
) {
3201 ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s",
3202 session
->name
, lttng_strerror(-ret
));
3204 if (reply_context
) {
3205 reply_context
->implicit_rotation_on_destroy
= true;
3207 } else if (session
->has_been_started
&& session
->current_trace_chunk
) {
3209 * The user has not triggered a session rotation. However, to
3210 * ensure all data has been consumed, the session is rotated
3211 * to a 'null' trace chunk before it is destroyed.
3213 * This is a "quiet" rotation meaning that no notification is
3214 * emitted and no renaming of the current trace chunk takes
3217 ret
= cmd_rotate_session(session
, NULL
, true);
3218 if (ret
!= LTTNG_OK
) {
3219 ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s",
3220 session
->name
, lttng_strerror(-ret
));
3224 if (session
->shm_path
[0]) {
3226 * When a session is created with an explicit shm_path,
3227 * the consumer daemon will create its shared memory files
3228 * at that location and will *not* unlink them. This is normal
3229 * as the intention of that feature is to make it possible
3230 * to retrieve the content of those files should a crash occur.
3232 * To ensure the content of those files can be used, the
3233 * sessiond daemon will replicate the content of the metadata
3234 * cache in a metadata file.
3236 * On clean-up, it is expected that the consumer daemon will
3237 * unlink the shared memory files and that the session daemon
3238 * will unlink the metadata file. Then, the session's directory
3239 * in the shm path can be removed.
3241 * Unfortunately, a flaw in the design of the sessiond's and
3242 * consumerd's tear down of channels makes it impossible to
3243 * determine when the sessiond _and_ the consumerd have both
3244 * destroyed their representation of a channel. For one, the
3245 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3246 * callbacks in both daemons.
3248 * However, it is also impossible for the sessiond to know when
3249 * the consumer daemon is done destroying its channel(s) since
3250 * it occurs as a reaction to the closing of the channel's file
3251 * descriptor. There is no resulting communication initiated
3252 * from the consumerd to the sessiond to confirm that the
3253 * operation is completed (and was successful).
3255 * Until this is all fixed, the session daemon checks for the
3256 * removal of the session's shm path which makes it possible
3257 * to safely advertise a session as having been destroyed.
3259 * Prior to this fix, it was not possible to reliably save
3260 * a session making use of the --shm-path option, destroy it,
3261 * and load it again. This is because the creation of the
3262 * session would fail upon seeing the session's shm path
3263 * already in existence.
3265 * Note that none of the error paths in the check for the
3266 * directory's existence return an error. This is normal
3267 * as there isn't much that can be done. The session will
3268 * be destroyed properly, except that we can't offer the
3269 * guarantee that the same session can be re-created.
3271 current_completion_handler
= &destroy_completion_handler
.handler
;
3272 ret
= lttng_strncpy(destroy_completion_handler
.shm_path
,
3274 sizeof(destroy_completion_handler
.shm_path
));
3279 * The session is destroyed. However, note that the command context
3280 * still holds a reference to the session, thus delaying its destruction
3281 * _at least_ up to the point when that reference is released.
3283 session_destroy(session
);
3284 if (reply_context
) {
3285 ret
= session_add_destroy_notifier(session
,
3286 cmd_destroy_session_reply
,
3287 (void *) reply_context
);
3289 ret
= LTTNG_ERR_FATAL
;
3301 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3303 int cmd_register_consumer(struct ltt_session
*session
,
3304 enum lttng_domain_type domain
, const char *sock_path
,
3305 struct consumer_data
*cdata
)
3308 struct consumer_socket
*socket
= NULL
;
3315 case LTTNG_DOMAIN_KERNEL
:
3317 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3321 /* Can't register a consumer if there is already one */
3322 if (ksess
->consumer_fds_sent
!= 0) {
3323 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3327 sock
= lttcomm_connect_unix_sock(sock_path
);
3329 ret
= LTTNG_ERR_CONNECT_FAIL
;
3332 cdata
->cmd_sock
= sock
;
3334 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
3335 if (socket
== NULL
) {
3338 PERROR("close register consumer");
3340 cdata
->cmd_sock
= -1;
3341 ret
= LTTNG_ERR_FATAL
;
3345 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
3346 if (socket
->lock
== NULL
) {
3347 PERROR("zmalloc pthread mutex");
3348 ret
= LTTNG_ERR_FATAL
;
3351 pthread_mutex_init(socket
->lock
, NULL
);
3352 socket
->registered
= 1;
3355 consumer_add_socket(socket
, ksess
->consumer
);
3358 pthread_mutex_lock(&cdata
->pid_mutex
);
3360 pthread_mutex_unlock(&cdata
->pid_mutex
);
3365 /* TODO: Userspace tracing */
3366 ret
= LTTNG_ERR_UND
;
3374 consumer_destroy_socket(socket
);
3380 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3382 ssize_t
cmd_list_domains(struct ltt_session
*session
,
3383 struct lttng_domain
**domains
)
3388 struct lttng_ht_iter iter
;
3390 if (session
->kernel_session
!= NULL
) {
3391 DBG3("Listing domains found kernel domain");
3395 if (session
->ust_session
!= NULL
) {
3396 DBG3("Listing domains found UST global domain");
3400 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3402 if (agt
->being_used
) {
3413 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3414 if (*domains
== NULL
) {
3415 ret
= LTTNG_ERR_FATAL
;
3419 if (session
->kernel_session
!= NULL
) {
3420 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3422 /* Kernel session buffer type is always GLOBAL */
3423 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
3428 if (session
->ust_session
!= NULL
) {
3429 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3430 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3434 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3436 if (agt
->being_used
) {
3437 (*domains
)[index
].type
= agt
->domain
;
3438 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3448 /* Return negative value to differentiate return code */
3454 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3456 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
3457 struct ltt_session
*session
, struct lttng_channel
**channels
)
3459 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
3462 case LTTNG_DOMAIN_KERNEL
:
3463 if (session
->kernel_session
!= NULL
) {
3464 nb_chan
= session
->kernel_session
->channel_count
;
3466 DBG3("Number of kernel channels %zd", nb_chan
);
3468 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
3472 case LTTNG_DOMAIN_UST
:
3473 if (session
->ust_session
!= NULL
) {
3475 nb_chan
= lttng_ht_get_count(
3476 session
->ust_session
->domain_global
.channels
);
3479 DBG3("Number of UST global channels %zd", nb_chan
);
3481 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
3486 ret
= -LTTNG_ERR_UND
;
3491 const size_t channel_size
= sizeof(struct lttng_channel
) +
3492 sizeof(struct lttng_channel_extended
);
3493 struct lttng_channel_extended
*channel_exts
;
3495 payload_size
= nb_chan
* channel_size
;
3496 *channels
= zmalloc(payload_size
);
3497 if (*channels
== NULL
) {
3498 ret
= -LTTNG_ERR_FATAL
;
3502 channel_exts
= ((void *) *channels
) +
3503 (nb_chan
* sizeof(struct lttng_channel
));
3504 ret
= list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3505 if (ret
!= LTTNG_OK
) {
3520 * Command LTTNG_LIST_EVENTS processed by the client thread.
3522 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3523 struct ltt_session
*session
, char *channel_name
,
3524 struct lttng_event
**events
, size_t *total_size
)
3527 ssize_t nb_event
= 0;
3530 case LTTNG_DOMAIN_KERNEL
:
3531 if (session
->kernel_session
!= NULL
) {
3532 nb_event
= list_lttng_kernel_events(channel_name
,
3533 session
->kernel_session
, events
,
3537 case LTTNG_DOMAIN_UST
:
3539 if (session
->ust_session
!= NULL
) {
3540 nb_event
= list_lttng_ust_global_events(channel_name
,
3541 &session
->ust_session
->domain_global
, events
,
3546 case LTTNG_DOMAIN_LOG4J
:
3547 case LTTNG_DOMAIN_JUL
:
3548 case LTTNG_DOMAIN_PYTHON
:
3549 if (session
->ust_session
) {
3550 struct lttng_ht_iter iter
;
3554 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3555 &iter
.iter
, agt
, node
.node
) {
3556 if (agt
->domain
== domain
) {
3557 nb_event
= list_lttng_agent_events(
3567 ret
= LTTNG_ERR_UND
;
3574 /* Return negative value to differentiate return code */
3579 * Using the session list, filled a lttng_session array to send back to the
3580 * client for session listing.
3582 * The session list lock MUST be acquired before calling this function. Use
3583 * session_lock_list() and session_unlock_list().
3585 void cmd_list_lttng_sessions(struct lttng_session
*sessions
,
3586 size_t session_count
, uid_t uid
, gid_t gid
)
3590 struct ltt_session
*session
;
3591 struct ltt_session_list
*list
= session_get_list();
3592 struct lttng_session_extended
*extended
=
3593 (typeof(extended
)) (&sessions
[session_count
]);
3595 DBG("Getting all available session for UID %d GID %d",
3598 * Iterate over session list and append data after the control struct in
3601 cds_list_for_each_entry(session
, &list
->head
, list
) {
3602 if (!session_get(session
)) {
3606 * Only list the sessions the user can control.
3608 if (!session_access_ok(session
, uid
, gid
) ||
3609 session
->destroyed
) {
3610 session_put(session
);
3614 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3615 struct ltt_ust_session
*usess
= session
->ust_session
;
3617 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3618 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3619 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3620 ret
= build_network_session_path(sessions
[i
].path
,
3621 sizeof(sessions
[i
].path
), session
);
3623 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3624 session
->consumer
->dst
.session_root_path
);
3627 PERROR("snprintf session path");
3628 session_put(session
);
3632 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3633 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3634 sessions
[i
].enabled
= session
->active
;
3635 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3636 sessions
[i
].live_timer_interval
= session
->live_timer
;
3637 extended
[i
].creation_time
.value
= (uint64_t) session
->creation_time
;
3638 extended
[i
].creation_time
.is_set
= 1;
3640 session_put(session
);
3645 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3646 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3648 int cmd_data_pending(struct ltt_session
*session
)
3651 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3652 struct ltt_ust_session
*usess
= session
->ust_session
;
3656 DBG("Data pending for session %s", session
->name
);
3658 /* Session MUST be stopped to ask for data availability. */
3659 if (session
->active
) {
3660 ret
= LTTNG_ERR_SESSION_STARTED
;
3664 * If stopped, just make sure we've started before else the above call
3665 * will always send that there is data pending.
3667 * The consumer assumes that when the data pending command is received,
3668 * the trace has been started before or else no output data is written
3669 * by the streams which is a condition for data pending. So, this is
3670 * *VERY* important that we don't ask the consumer before a start
3673 if (!session
->has_been_started
) {
3679 /* A rotation is still pending, we have to wait. */
3680 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
3681 DBG("Rotate still pending for session %s", session
->name
);
3686 if (ksess
&& ksess
->consumer
) {
3687 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3689 /* Data is still being extracted for the kernel. */
3694 if (usess
&& usess
->consumer
) {
3695 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3697 /* Data is still being extracted for the kernel. */
3702 /* Data is ready to be read by a viewer */
3710 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3712 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3714 int cmd_snapshot_add_output(struct ltt_session
*session
,
3715 struct lttng_snapshot_output
*output
, uint32_t *id
)
3718 struct snapshot_output
*new_output
;
3723 DBG("Cmd snapshot add output for session %s", session
->name
);
3726 * Can't create an output if the session is not set in no-output mode.
3728 if (session
->output_traces
) {
3729 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3733 if (session
->has_non_mmap_channel
) {
3734 ret
= LTTNG_ERR_SNAPSHOT_UNSUPPORTED
;
3738 /* Only one output is allowed until we have the "tee" feature. */
3739 if (session
->snapshot
.nb_output
== 1) {
3740 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3744 new_output
= snapshot_output_alloc();
3746 ret
= LTTNG_ERR_NOMEM
;
3750 ret
= snapshot_output_init(session
, output
->max_size
, output
->name
,
3751 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3752 &session
->snapshot
);
3754 if (ret
== -ENOMEM
) {
3755 ret
= LTTNG_ERR_NOMEM
;
3757 ret
= LTTNG_ERR_INVALID
;
3763 snapshot_add_output(&session
->snapshot
, new_output
);
3765 *id
= new_output
->id
;
3772 snapshot_output_destroy(new_output
);
3778 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3780 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3782 int cmd_snapshot_del_output(struct ltt_session
*session
,
3783 struct lttng_snapshot_output
*output
)
3786 struct snapshot_output
*sout
= NULL
;
3794 * Permission denied to create an output if the session is not
3795 * set in no output mode.
3797 if (session
->output_traces
) {
3798 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3803 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3805 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3806 } else if (*output
->name
!= '\0') {
3807 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3809 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
3812 ret
= LTTNG_ERR_INVALID
;
3816 snapshot_delete_output(&session
->snapshot
, sout
);
3817 snapshot_output_destroy(sout
);
3826 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
3828 * If no output is available, outputs is untouched and 0 is returned.
3830 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
3832 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
3833 struct lttng_snapshot_output
**outputs
)
3836 struct lttng_snapshot_output
*list
= NULL
;
3837 struct lttng_ht_iter iter
;
3838 struct snapshot_output
*output
;
3843 DBG("Cmd snapshot list outputs for session %s", session
->name
);
3846 * Permission denied to create an output if the session is not
3847 * set in no output mode.
3849 if (session
->output_traces
) {
3850 ret
= -LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3854 if (session
->snapshot
.nb_output
== 0) {
3859 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
3861 ret
= -LTTNG_ERR_NOMEM
;
3865 /* Copy list from session to the new list object. */
3867 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
3868 output
, node
.node
) {
3869 assert(output
->consumer
);
3870 list
[idx
].id
= output
->id
;
3871 list
[idx
].max_size
= output
->max_size
;
3872 if (lttng_strncpy(list
[idx
].name
, output
->name
,
3873 sizeof(list
[idx
].name
))) {
3874 ret
= -LTTNG_ERR_INVALID
;
3877 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
3878 if (lttng_strncpy(list
[idx
].ctrl_url
,
3879 output
->consumer
->dst
.session_root_path
,
3880 sizeof(list
[idx
].ctrl_url
))) {
3881 ret
= -LTTNG_ERR_INVALID
;
3886 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
3887 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
3889 ret
= -LTTNG_ERR_NOMEM
;
3894 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
3895 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
3897 ret
= -LTTNG_ERR_NOMEM
;
3906 ret
= session
->snapshot
.nb_output
;
3915 * Check if we can regenerate the metadata for this session.
3916 * Only kernel, UST per-uid and non-live sessions are supported.
3918 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
3921 int check_regenerate_metadata_support(struct ltt_session
*session
)
3927 if (session
->live_timer
!= 0) {
3928 ret
= LTTNG_ERR_LIVE_SESSION
;
3931 if (!session
->active
) {
3932 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
3935 if (session
->ust_session
) {
3936 switch (session
->ust_session
->buffer_type
) {
3937 case LTTNG_BUFFER_PER_UID
:
3939 case LTTNG_BUFFER_PER_PID
:
3940 ret
= LTTNG_ERR_PER_PID_SESSION
;
3944 ret
= LTTNG_ERR_UNK
;
3948 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
3949 session
->consumer
->relay_minor_version
< 8) {
3950 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
3960 int clear_metadata_file(int fd
)
3965 lseek_ret
= lseek(fd
, 0, SEEK_SET
);
3966 if (lseek_ret
< 0) {
3972 ret
= ftruncate(fd
, 0);
3974 PERROR("ftruncate");
3983 int ust_regenerate_metadata(struct ltt_ust_session
*usess
)
3986 struct buffer_reg_uid
*uid_reg
= NULL
;
3987 struct buffer_reg_session
*session_reg
= NULL
;
3990 cds_list_for_each_entry(uid_reg
, &usess
->buffer_reg_uid_list
, lnode
) {
3991 struct ust_registry_session
*registry
;
3992 struct ust_registry_channel
*chan
;
3993 struct lttng_ht_iter iter_chan
;
3995 session_reg
= uid_reg
->registry
;
3996 registry
= session_reg
->reg
.ust
;
3998 pthread_mutex_lock(®istry
->lock
);
3999 registry
->metadata_len_sent
= 0;
4000 memset(registry
->metadata
, 0, registry
->metadata_alloc_len
);
4001 registry
->metadata_len
= 0;
4002 registry
->metadata_version
++;
4003 if (registry
->metadata_fd
> 0) {
4004 /* Clear the metadata file's content. */
4005 ret
= clear_metadata_file(registry
->metadata_fd
);
4007 pthread_mutex_unlock(®istry
->lock
);
4012 ret
= ust_metadata_session_statedump(registry
, NULL
,
4013 registry
->major
, registry
->minor
);
4015 pthread_mutex_unlock(®istry
->lock
);
4016 ERR("Failed to generate session metadata (err = %d)",
4020 cds_lfht_for_each_entry(registry
->channels
->ht
, &iter_chan
.iter
,
4022 struct ust_registry_event
*event
;
4023 struct lttng_ht_iter iter_event
;
4025 ret
= ust_metadata_channel_statedump(registry
, chan
);
4027 pthread_mutex_unlock(®istry
->lock
);
4028 ERR("Failed to generate channel metadata "
4032 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter_event
.iter
,
4034 ret
= ust_metadata_event_statedump(registry
,
4037 pthread_mutex_unlock(®istry
->lock
);
4038 ERR("Failed to generate event metadata "
4044 pthread_mutex_unlock(®istry
->lock
);
4053 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
4055 * Ask the consumer to truncate the existing metadata file(s) and
4056 * then regenerate the metadata. Live and per-pid sessions are not
4057 * supported and return an error.
4059 * Return 0 on success or else a LTTNG_ERR code.
4061 int cmd_regenerate_metadata(struct ltt_session
*session
)
4067 ret
= check_regenerate_metadata_support(session
);
4072 if (session
->kernel_session
) {
4073 ret
= kernctl_session_regenerate_metadata(
4074 session
->kernel_session
->fd
);
4076 ERR("Failed to regenerate the kernel metadata");
4081 if (session
->ust_session
) {
4082 ret
= ust_regenerate_metadata(session
->ust_session
);
4084 ERR("Failed to regenerate the UST metadata");
4088 DBG("Cmd metadata regenerate for session %s", session
->name
);
4096 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
4098 * Ask the tracer to regenerate a new statedump.
4100 * Return 0 on success or else a LTTNG_ERR code.
4102 int cmd_regenerate_statedump(struct ltt_session
*session
)
4108 if (!session
->active
) {
4109 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
4113 if (session
->kernel_session
) {
4114 ret
= kernctl_session_regenerate_statedump(
4115 session
->kernel_session
->fd
);
4117 * Currently, the statedump in kernel can only fail if out
4121 if (ret
== -ENOMEM
) {
4122 ret
= LTTNG_ERR_REGEN_STATEDUMP_NOMEM
;
4124 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4126 ERR("Failed to regenerate the kernel statedump");
4131 if (session
->ust_session
) {
4132 ret
= ust_app_regenerate_statedump_all(session
->ust_session
);
4134 * Currently, the statedump in UST always returns 0.
4137 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4138 ERR("Failed to regenerate the UST statedump");
4142 DBG("Cmd regenerate statedump for session %s", session
->name
);
4149 int cmd_register_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4150 struct notification_thread_handle
*notification_thread
)
4154 ssize_t sock_recv_len
;
4155 struct lttng_trigger
*trigger
= NULL
;
4156 struct lttng_buffer_view view
;
4157 struct lttng_dynamic_buffer trigger_buffer
;
4159 lttng_dynamic_buffer_init(&trigger_buffer
);
4160 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4161 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4163 ret
= LTTNG_ERR_NOMEM
;
4167 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4169 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4170 ERR("Failed to receive \"register trigger\" command payload");
4171 /* TODO: should this be a new error enum ? */
4172 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4176 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4177 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4179 ERR("Invalid trigger payload received in \"register trigger\" command");
4180 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4184 ret
= notification_thread_command_register_trigger(notification_thread
,
4186 /* Ownership of trigger was transferred. */
4189 lttng_trigger_destroy(trigger
);
4190 lttng_dynamic_buffer_reset(&trigger_buffer
);
4194 int cmd_unregister_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4195 struct notification_thread_handle
*notification_thread
)
4199 ssize_t sock_recv_len
;
4200 struct lttng_trigger
*trigger
= NULL
;
4201 struct lttng_buffer_view view
;
4202 struct lttng_dynamic_buffer trigger_buffer
;
4204 lttng_dynamic_buffer_init(&trigger_buffer
);
4205 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4206 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4208 ret
= LTTNG_ERR_NOMEM
;
4212 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4214 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4215 ERR("Failed to receive \"unregister trigger\" command payload");
4216 /* TODO: should this be a new error enum ? */
4217 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4221 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4222 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4224 ERR("Invalid trigger payload received in \"unregister trigger\" command");
4225 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4229 ret
= notification_thread_command_unregister_trigger(notification_thread
,
4232 lttng_trigger_destroy(trigger
);
4233 lttng_dynamic_buffer_reset(&trigger_buffer
);
4238 * Send relayd sockets from snapshot output to consumer. Ignore request if the
4239 * snapshot output is *not* set with a remote destination.
4241 * Return LTTNG_OK on success or a LTTNG_ERR code.
4243 static enum lttng_error_code
set_relayd_for_snapshot(
4244 struct consumer_output
*output
,
4245 const struct ltt_session
*session
)
4247 enum lttng_error_code status
= LTTNG_OK
;
4248 struct lttng_ht_iter iter
;
4249 struct consumer_socket
*socket
;
4250 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
4251 const char *base_path
;
4256 DBG2("Set relayd object from snapshot output");
4258 if (session
->current_trace_chunk
) {
4259 enum lttng_trace_chunk_status chunk_status
=
4260 lttng_trace_chunk_get_id(
4261 session
->current_trace_chunk
,
4262 ¤t_chunk_id
.value
);
4264 if (chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
4265 current_chunk_id
.is_set
= true;
4267 ERR("Failed to get current trace chunk id");
4268 status
= LTTNG_ERR_UNK
;
4273 /* Ignore if snapshot consumer output is not network. */
4274 if (output
->type
!= CONSUMER_DST_NET
) {
4279 * The snapshot record URI base path overrides the session
4282 if (output
->dst
.net
.control
.subdir
[0] != '\0') {
4283 base_path
= output
->dst
.net
.control
.subdir
;
4285 base_path
= session
->base_path
;
4289 * For each consumer socket, create and send the relayd object of the
4293 cds_lfht_for_each_entry(output
->socks
->ht
, &iter
.iter
,
4294 socket
, node
.node
) {
4295 pthread_mutex_lock(socket
->lock
);
4296 status
= send_consumer_relayd_sockets(0, session
->id
,
4298 session
->name
, session
->hostname
,
4300 session
->live_timer
,
4301 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
4302 session
->creation_time
,
4303 session
->name_contains_creation_time
);
4304 pthread_mutex_unlock(socket
->lock
);
4305 if (status
!= LTTNG_OK
) {
4317 * Record a kernel snapshot.
4319 * Return LTTNG_OK on success or a LTTNG_ERR code.
4321 static enum lttng_error_code
record_kernel_snapshot(
4322 struct ltt_kernel_session
*ksess
,
4323 const struct consumer_output
*output
,
4324 const struct ltt_session
*session
,
4325 int wait
, uint64_t nb_packets_per_stream
)
4327 enum lttng_error_code status
;
4333 status
= kernel_snapshot_record(
4334 ksess
, output
, wait
, nb_packets_per_stream
);
4339 * Record a UST snapshot.
4341 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
4343 static enum lttng_error_code
record_ust_snapshot(struct ltt_ust_session
*usess
,
4344 const struct consumer_output
*output
,
4345 const struct ltt_session
*session
,
4346 int wait
, uint64_t nb_packets_per_stream
)
4348 enum lttng_error_code status
;
4354 status
= ust_app_snapshot_record(
4355 usess
, output
, wait
, nb_packets_per_stream
);
4360 uint64_t get_session_size_one_more_packet_per_stream(
4361 const struct ltt_session
*session
, uint64_t cur_nr_packets
)
4363 uint64_t tot_size
= 0;
4365 if (session
->kernel_session
) {
4366 struct ltt_kernel_channel
*chan
;
4367 const struct ltt_kernel_session
*ksess
=
4368 session
->kernel_session
;
4370 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
4371 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
4373 * Don't take channel into account if we
4374 * already grab all its packets.
4378 tot_size
+= chan
->channel
->attr
.subbuf_size
4379 * chan
->stream_count
;
4383 if (session
->ust_session
) {
4384 const struct ltt_ust_session
*usess
= session
->ust_session
;
4386 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
4394 * Calculate the number of packets we can grab from each stream that
4395 * fits within the overall snapshot max size.
4397 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
4398 * the number of packets per stream.
4400 * TODO: this approach is not perfect: we consider the worse case
4401 * (packet filling the sub-buffers) as an upper bound, but we could do
4402 * better if we do this calculation while we actually grab the packet
4403 * content: we would know how much padding we don't actually store into
4406 * This algorithm is currently bounded by the number of packets per
4409 * Since we call this algorithm before actually grabbing the data, it's
4410 * an approximation: for instance, applications could appear/disappear
4411 * in between this call and actually grabbing data.
4414 int64_t get_session_nb_packets_per_stream(const struct ltt_session
*session
,
4418 uint64_t cur_nb_packets
= 0;
4421 return 0; /* Infinite */
4424 size_left
= max_size
;
4426 uint64_t one_more_packet_tot_size
;
4428 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(
4429 session
, cur_nb_packets
);
4430 if (!one_more_packet_tot_size
) {
4431 /* We are already grabbing all packets. */
4434 size_left
-= one_more_packet_tot_size
;
4435 if (size_left
< 0) {
4440 if (!cur_nb_packets
) {
4441 /* Not enough room to grab one packet of each stream, error. */
4444 return cur_nb_packets
;
4448 enum lttng_error_code
snapshot_record(struct ltt_session
*session
,
4449 const struct snapshot_output
*snapshot_output
, int wait
)
4451 int64_t nb_packets_per_stream
;
4452 char snapshot_chunk_name
[LTTNG_NAME_MAX
];
4454 enum lttng_error_code ret_code
= LTTNG_OK
;
4455 struct lttng_trace_chunk
*snapshot_trace_chunk
;
4456 struct consumer_output
*original_ust_consumer_output
= NULL
;
4457 struct consumer_output
*original_kernel_consumer_output
= NULL
;
4458 struct consumer_output
*snapshot_ust_consumer_output
= NULL
;
4459 struct consumer_output
*snapshot_kernel_consumer_output
= NULL
;
4461 ret
= snprintf(snapshot_chunk_name
, sizeof(snapshot_chunk_name
),
4463 snapshot_output
->name
,
4464 snapshot_output
->datetime
,
4465 snapshot_output
->nb_snapshot
);
4466 if (ret
< 0 || ret
>= sizeof(snapshot_chunk_name
)) {
4467 ERR("Failed to format snapshot name");
4468 ret_code
= LTTNG_ERR_INVALID
;
4471 DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"",
4472 snapshot_output
->name
, session
->name
,
4473 snapshot_chunk_name
);
4474 if (!session
->kernel_session
&& !session
->ust_session
) {
4475 ERR("Failed to record snapshot as no channels exist");
4476 ret_code
= LTTNG_ERR_NO_CHANNEL
;
4480 if (session
->kernel_session
) {
4481 original_kernel_consumer_output
=
4482 session
->kernel_session
->consumer
;
4483 snapshot_kernel_consumer_output
=
4484 consumer_copy_output(snapshot_output
->consumer
);
4485 strcpy(snapshot_kernel_consumer_output
->chunk_path
,
4486 snapshot_chunk_name
);
4487 ret
= consumer_copy_sockets(snapshot_kernel_consumer_output
,
4488 original_kernel_consumer_output
);
4490 ERR("Failed to copy consumer sockets from snapshot output configuration");
4491 ret_code
= LTTNG_ERR_NOMEM
;
4494 ret_code
= set_relayd_for_snapshot(
4495 snapshot_kernel_consumer_output
, session
);
4496 if (ret_code
!= LTTNG_OK
) {
4497 ERR("Failed to setup relay daemon for kernel tracer snapshot");
4500 session
->kernel_session
->consumer
=
4501 snapshot_kernel_consumer_output
;
4503 if (session
->ust_session
) {
4504 original_ust_consumer_output
= session
->ust_session
->consumer
;
4505 snapshot_ust_consumer_output
=
4506 consumer_copy_output(snapshot_output
->consumer
);
4507 strcpy(snapshot_ust_consumer_output
->chunk_path
,
4508 snapshot_chunk_name
);
4509 ret
= consumer_copy_sockets(snapshot_ust_consumer_output
,
4510 original_ust_consumer_output
);
4512 ERR("Failed to copy consumer sockets from snapshot output configuration");
4513 ret_code
= LTTNG_ERR_NOMEM
;
4516 ret_code
= set_relayd_for_snapshot(
4517 snapshot_ust_consumer_output
, session
);
4518 if (ret_code
!= LTTNG_OK
) {
4519 ERR("Failed to setup relay daemon for userspace tracer snapshot");
4522 session
->ust_session
->consumer
=
4523 snapshot_ust_consumer_output
;
4526 snapshot_trace_chunk
= session_create_new_trace_chunk(session
,
4527 snapshot_kernel_consumer_output
?:
4528 snapshot_ust_consumer_output
,
4529 consumer_output_get_base_path(
4530 snapshot_output
->consumer
),
4531 snapshot_chunk_name
);
4532 if (!snapshot_trace_chunk
) {
4533 ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"",
4535 ret_code
= LTTNG_ERR_CREATE_DIR_FAIL
;
4538 assert(!session
->current_trace_chunk
);
4539 ret
= session_set_trace_chunk(session
, snapshot_trace_chunk
, NULL
);
4540 lttng_trace_chunk_put(snapshot_trace_chunk
);
4541 snapshot_trace_chunk
= NULL
;
4543 ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"",
4545 ret_code
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4549 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
4550 snapshot_output
->max_size
);
4551 if (nb_packets_per_stream
< 0) {
4552 ret_code
= LTTNG_ERR_MAX_SIZE_INVALID
;
4556 if (session
->kernel_session
) {
4557 ret_code
= record_kernel_snapshot(session
->kernel_session
,
4558 snapshot_kernel_consumer_output
, session
,
4559 wait
, nb_packets_per_stream
);
4560 if (ret_code
!= LTTNG_OK
) {
4565 if (session
->ust_session
) {
4566 ret_code
= record_ust_snapshot(session
->ust_session
,
4567 snapshot_ust_consumer_output
, session
,
4568 wait
, nb_packets_per_stream
);
4569 if (ret_code
!= LTTNG_OK
) {
4574 if (session_close_trace_chunk(
4575 session
, session
->current_trace_chunk
, NULL
, NULL
)) {
4577 * Don't goto end; make sure the chunk is closed for the session
4578 * to allow future snapshots.
4580 ERR("Failed to close snapshot trace chunk of session \"%s\"",
4582 ret_code
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
4584 if (session_set_trace_chunk(session
, NULL
, NULL
)) {
4585 ERR("Failed to release the current trace chunk of session \"%s\"",
4587 ret_code
= LTTNG_ERR_UNK
;
4590 if (original_ust_consumer_output
) {
4591 session
->ust_session
->consumer
= original_ust_consumer_output
;
4593 if (original_kernel_consumer_output
) {
4594 session
->kernel_session
->consumer
=
4595 original_kernel_consumer_output
;
4597 consumer_output_put(snapshot_ust_consumer_output
);
4598 consumer_output_put(snapshot_kernel_consumer_output
);
4603 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
4605 * The wait parameter is ignored so this call always wait for the snapshot to
4606 * complete before returning.
4608 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4610 int cmd_snapshot_record(struct ltt_session
*session
,
4611 struct lttng_snapshot_output
*output
, int wait
)
4613 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4615 unsigned int snapshot_success
= 0;
4617 struct snapshot_output
*tmp_output
= NULL
;
4622 DBG("Cmd snapshot record for session %s", session
->name
);
4624 /* Get the datetime for the snapshot output directory. */
4625 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", datetime
,
4628 cmd_ret
= LTTNG_ERR_INVALID
;
4633 * Permission denied to create an output if the session is not
4634 * set in no output mode.
4636 if (session
->output_traces
) {
4637 cmd_ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
4641 /* The session needs to be started at least once. */
4642 if (!session
->has_been_started
) {
4643 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4647 /* Use temporary output for the session. */
4648 if (*output
->ctrl_url
!= '\0') {
4649 tmp_output
= snapshot_output_alloc();
4651 cmd_ret
= LTTNG_ERR_NOMEM
;
4655 ret
= snapshot_output_init(session
, output
->max_size
,
4657 output
->ctrl_url
, output
->data_url
,
4661 if (ret
== -ENOMEM
) {
4662 cmd_ret
= LTTNG_ERR_NOMEM
;
4664 cmd_ret
= LTTNG_ERR_INVALID
;
4668 /* Use the global session count for the temporary snapshot. */
4669 tmp_output
->nb_snapshot
= session
->snapshot
.nb_snapshot
;
4671 /* Use the global datetime */
4672 memcpy(tmp_output
->datetime
, datetime
, sizeof(datetime
));
4673 cmd_ret
= snapshot_record(session
, tmp_output
, wait
);
4674 if (cmd_ret
!= LTTNG_OK
) {
4677 snapshot_success
= 1;
4679 struct snapshot_output
*sout
;
4680 struct lttng_ht_iter iter
;
4683 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
4684 &iter
.iter
, sout
, node
.node
) {
4685 struct snapshot_output output_copy
;
4688 * Make a local copy of the output and override output
4689 * parameters with those provided as part of the
4692 memcpy(&output_copy
, sout
, sizeof(output_copy
));
4694 if (output
->max_size
!= (uint64_t) -1ULL) {
4695 output_copy
.max_size
= output
->max_size
;
4698 output_copy
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
4699 memcpy(output_copy
.datetime
, datetime
,
4702 /* Use temporary name. */
4703 if (*output
->name
!= '\0') {
4704 if (lttng_strncpy(output_copy
.name
,
4706 sizeof(output_copy
.name
))) {
4707 cmd_ret
= LTTNG_ERR_INVALID
;
4713 cmd_ret
= snapshot_record(session
, &output_copy
, wait
);
4714 if (cmd_ret
!= LTTNG_OK
) {
4718 snapshot_success
= 1;
4723 if (snapshot_success
) {
4724 session
->snapshot
.nb_snapshot
++;
4726 cmd_ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
4731 snapshot_output_destroy(tmp_output
);
4737 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
4739 int cmd_set_session_shm_path(struct ltt_session
*session
,
4740 const char *shm_path
)
4746 * Can only set shm path before session is started.
4748 if (session
->has_been_started
) {
4749 return LTTNG_ERR_SESSION_STARTED
;
4752 strncpy(session
->shm_path
, shm_path
,
4753 sizeof(session
->shm_path
));
4754 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
4760 * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
4762 * Ask the consumer to rotate the session output directory.
4763 * The session lock must be held.
4765 * Returns LTTNG_OK on success or else a negative LTTng error code.
4767 int cmd_rotate_session(struct ltt_session
*session
,
4768 struct lttng_rotate_session_return
*rotate_return
,
4769 bool quiet_rotation
)
4772 uint64_t ongoing_rotation_chunk_id
;
4773 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4774 struct lttng_trace_chunk
*chunk_being_archived
= NULL
;
4775 struct lttng_trace_chunk
*new_trace_chunk
= NULL
;
4776 enum lttng_trace_chunk_status chunk_status
;
4780 if (!session
->has_been_started
) {
4781 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4786 * Explicit rotation is not supported for live sessions.
4787 * However, live sessions can perform a quiet rotation on
4789 * Rotation is not supported for snapshot traces (no output).
4791 if ((!quiet_rotation
&& session
->live_timer
) ||
4792 !session
->output_traces
) {
4793 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
4797 /* Unsupported feature in lttng-relayd before 2.11. */
4798 if (!quiet_rotation
&& session
->consumer
->type
== CONSUMER_DST_NET
&&
4799 (session
->consumer
->relay_major_version
== 2 &&
4800 session
->consumer
->relay_minor_version
< 11)) {
4801 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY
;
4805 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
4806 DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
4808 cmd_ret
= LTTNG_ERR_ROTATION_PENDING
;
4813 * After a stop, we only allow one rotation to occur, the other ones are
4814 * useless until a new start.
4816 if (session
->rotated_after_last_stop
) {
4817 DBG("Session \"%s\" was already rotated after stop, refusing rotation",
4819 cmd_ret
= LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP
;
4823 session
->rotation_state
= LTTNG_ROTATION_STATE_ONGOING
;
4825 if (session
->active
) {
4826 new_trace_chunk
= session_create_new_trace_chunk(session
, NULL
,
4828 if (!new_trace_chunk
) {
4829 cmd_ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
4834 /* The current trace chunk becomes the chunk being archived. */
4835 ret
= session_set_trace_chunk(session
, new_trace_chunk
,
4836 &chunk_being_archived
);
4838 cmd_ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4842 assert(chunk_being_archived
);
4843 chunk_status
= lttng_trace_chunk_get_id(chunk_being_archived
,
4844 &ongoing_rotation_chunk_id
);
4845 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
4847 if (session
->kernel_session
) {
4848 cmd_ret
= kernel_rotate_session(session
);
4849 if (cmd_ret
!= LTTNG_OK
) {
4853 if (session
->ust_session
) {
4854 cmd_ret
= ust_app_rotate_session(session
);
4855 if (cmd_ret
!= LTTNG_OK
) {
4860 ret
= session_close_trace_chunk(session
, chunk_being_archived
,
4863 &((enum lttng_trace_chunk_command_type
){
4864 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
}),
4865 session
->last_chunk_path
);
4867 cmd_ret
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
4871 session
->quiet_rotation
= quiet_rotation
;
4872 ret
= timer_session_rotation_pending_check_start(session
,
4873 DEFAULT_ROTATE_PENDING_TIMER
);
4875 cmd_ret
= LTTNG_ERR_UNK
;
4879 if (!session
->active
) {
4880 session
->rotated_after_last_stop
= true;
4883 if (rotate_return
) {
4884 rotate_return
->rotation_id
= ongoing_rotation_chunk_id
;
4887 session
->chunk_being_archived
= chunk_being_archived
;
4888 chunk_being_archived
= NULL
;
4889 if (!quiet_rotation
) {
4890 ret
= notification_thread_command_session_rotation_ongoing(
4891 notification_thread_handle
,
4892 session
->name
, session
->uid
, session
->gid
,
4893 ongoing_rotation_chunk_id
);
4894 if (ret
!= LTTNG_OK
) {
4895 ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
4901 DBG("Cmd rotate session %s, archive_id %" PRIu64
" sent",
4902 session
->name
, ongoing_rotation_chunk_id
);
4904 lttng_trace_chunk_put(new_trace_chunk
);
4905 lttng_trace_chunk_put(chunk_being_archived
);
4906 ret
= (cmd_ret
== LTTNG_OK
) ? cmd_ret
: -((int) cmd_ret
);
4909 if (session_reset_rotation_state(session
,
4910 LTTNG_ROTATION_STATE_ERROR
)) {
4911 ERR("Failed to reset rotation state of session \"%s\"",
4918 * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
4920 * Check if the session has finished its rotation.
4922 * Return LTTNG_OK on success or else an LTTNG_ERR code.
4924 int cmd_rotate_get_info(struct ltt_session
*session
,
4925 struct lttng_rotation_get_info_return
*info_return
,
4926 uint64_t rotation_id
)
4928 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4929 enum lttng_rotation_state rotation_state
;
4931 DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64
, session
->name
,
4932 session
->most_recent_chunk_id
.value
);
4934 if (session
->chunk_being_archived
) {
4935 enum lttng_trace_chunk_status chunk_status
;
4938 chunk_status
= lttng_trace_chunk_get_id(
4939 session
->chunk_being_archived
,
4941 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
4943 rotation_state
= rotation_id
== chunk_id
?
4944 LTTNG_ROTATION_STATE_ONGOING
:
4945 LTTNG_ROTATION_STATE_EXPIRED
;
4947 if (session
->last_archived_chunk_id
.is_set
&&
4948 rotation_id
!= session
->last_archived_chunk_id
.value
) {
4949 rotation_state
= LTTNG_ROTATION_STATE_EXPIRED
;
4951 rotation_state
= session
->rotation_state
;
4955 switch (rotation_state
) {
4956 case LTTNG_ROTATION_STATE_NO_ROTATION
:
4957 DBG("Reporting that no rotation has occured within the lifetime of session \"%s\"",
4960 case LTTNG_ROTATION_STATE_EXPIRED
:
4961 DBG("Reporting that the rotation state of rotation id %" PRIu64
" of session \"%s\" has expired",
4962 rotation_id
, session
->name
);
4964 case LTTNG_ROTATION_STATE_ONGOING
:
4965 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is still pending",
4966 rotation_id
, session
->name
);
4968 case LTTNG_ROTATION_STATE_COMPLETED
:
4972 char *current_tracing_path_reply
;
4973 size_t current_tracing_path_reply_len
;
4975 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is completed",
4976 rotation_id
, session
->name
);
4978 switch (session_get_consumer_destination_type(session
)) {
4979 case CONSUMER_DST_LOCAL
:
4980 current_tracing_path_reply
=
4981 info_return
->location
.local
.absolute_path
;
4982 current_tracing_path_reply_len
=
4983 sizeof(info_return
->location
.local
.absolute_path
);
4984 info_return
->location_type
=
4985 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL
;
4986 fmt_ret
= asprintf(&chunk_path
,
4987 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
"/%s",
4988 session_get_base_path(session
),
4989 session
->last_archived_chunk_name
);
4990 if (fmt_ret
== -1) {
4991 PERROR("Failed to format the path of the last archived trace chunk");
4992 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
4993 cmd_ret
= LTTNG_ERR_UNK
;
4997 case CONSUMER_DST_NET
:
4999 uint16_t ctrl_port
, data_port
;
5001 current_tracing_path_reply
=
5002 info_return
->location
.relay
.relative_path
;
5003 current_tracing_path_reply_len
=
5004 sizeof(info_return
->location
.relay
.relative_path
);
5005 /* Currently the only supported relay protocol. */
5006 info_return
->location
.relay
.protocol
=
5007 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP
;
5009 fmt_ret
= lttng_strncpy(info_return
->location
.relay
.host
,
5010 session_get_net_consumer_hostname(session
),
5011 sizeof(info_return
->location
.relay
.host
));
5013 ERR("Failed to copy host name to rotate_get_info reply");
5014 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5015 cmd_ret
= LTTNG_ERR_SET_URL
;
5019 session_get_net_consumer_ports(session
, &ctrl_port
, &data_port
);
5020 info_return
->location
.relay
.ports
.control
= ctrl_port
;
5021 info_return
->location
.relay
.ports
.data
= data_port
;
5022 info_return
->location_type
=
5023 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY
;
5024 chunk_path
= strdup(session
->last_chunk_path
);
5026 ERR("Failed to allocate the path of the last archived trace chunk");
5027 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5028 cmd_ret
= LTTNG_ERR_UNK
;
5037 fmt_ret
= lttng_strncpy(current_tracing_path_reply
,
5038 chunk_path
, current_tracing_path_reply_len
);
5041 ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply");
5042 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5043 cmd_ret
= LTTNG_ERR_UNK
;
5049 case LTTNG_ROTATION_STATE_ERROR
:
5050 DBG("Reporting that an error occurred during rotation %" PRIu64
" of session \"%s\"",
5051 rotation_id
, session
->name
);
5059 info_return
->status
= (int32_t) rotation_state
;
5064 * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
5066 * Configure the automatic rotation parameters.
5067 * 'activate' to true means activate the rotation schedule type with 'new_value'.
5068 * 'activate' to false means deactivate the rotation schedule and validate that
5069 * 'new_value' has the same value as the currently active value.
5071 * Return 0 on success or else a positive LTTNG_ERR code.
5073 int cmd_rotation_set_schedule(struct ltt_session
*session
,
5074 bool activate
, enum lttng_rotation_schedule_type schedule_type
,
5076 struct notification_thread_handle
*notification_thread_handle
)
5079 uint64_t *parameter_value
;
5083 DBG("Cmd rotate set schedule session %s", session
->name
);
5085 if (session
->live_timer
|| !session
->output_traces
) {
5086 DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
5087 ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
5091 switch (schedule_type
) {
5092 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5093 parameter_value
= &session
->rotate_size
;
5095 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5096 parameter_value
= &session
->rotate_timer_period
;
5097 if (new_value
>= UINT_MAX
) {
5098 DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64
" > %u (UINT_MAX)",
5099 new_value
, UINT_MAX
);
5100 ret
= LTTNG_ERR_INVALID
;
5105 WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
5106 ret
= LTTNG_ERR_INVALID
;
5110 /* Improper use of the API. */
5111 if (new_value
== -1ULL) {
5112 WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
5113 ret
= LTTNG_ERR_INVALID
;
5118 * As indicated in struct ltt_session's comments, a value of == 0 means
5119 * this schedule rotation type is not in use.
5121 * Reject the command if we were asked to activate a schedule that was
5124 if (activate
&& *parameter_value
!= 0) {
5125 DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
5126 ret
= LTTNG_ERR_ROTATION_SCHEDULE_SET
;
5131 * Reject the command if we were asked to deactivate a schedule that was
5134 if (!activate
&& *parameter_value
== 0) {
5135 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
5136 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5141 * Reject the command if we were asked to deactivate a schedule that
5144 if (!activate
&& *parameter_value
!= new_value
) {
5145 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
5146 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5150 *parameter_value
= activate
? new_value
: 0;
5152 switch (schedule_type
) {
5153 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5154 if (activate
&& session
->active
) {
5156 * Only start the timer if the session is active,
5157 * otherwise it will be started when the session starts.
5159 ret
= timer_session_rotation_schedule_timer_start(
5160 session
, new_value
);
5162 ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
5163 ret
= LTTNG_ERR_UNK
;
5167 ret
= timer_session_rotation_schedule_timer_stop(
5170 ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
5171 ret
= LTTNG_ERR_UNK
;
5176 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5178 ret
= subscribe_session_consumed_size_rotation(session
,
5179 new_value
, notification_thread_handle
);
5181 ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
5182 ret
= LTTNG_ERR_UNK
;
5186 ret
= unsubscribe_session_consumed_size_rotation(session
,
5187 notification_thread_handle
);
5189 ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
5190 ret
= LTTNG_ERR_UNK
;
5197 /* Would have been caught before. */
5209 /* Wait for a given path to be removed before continuing. */
5210 static enum lttng_error_code
wait_on_path(void *path_data
)
5212 const char *shm_path
= path_data
;
5214 DBG("Waiting for the shm path at %s to be removed before completing session destruction",
5220 ret
= stat(shm_path
, &st
);
5222 if (errno
!= ENOENT
) {
5223 PERROR("stat() returned an error while checking for the existence of the shm path");
5225 DBG("shm path no longer exists, completing the destruction of session");
5229 if (!S_ISDIR(st
.st_mode
)) {
5230 ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
5235 usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US
);
5241 * Returns a pointer to a handler to run on completion of a command.
5242 * Returns NULL if no handler has to be run for the last command executed.
5244 const struct cmd_completion_handler
*cmd_pop_completion_handler(void)
5246 struct cmd_completion_handler
*handler
= current_completion_handler
;
5248 current_completion_handler
= NULL
;
5253 * Init command subsystem.
5258 * Set network sequence index to 1 for streams to match a relayd
5259 * socket on the consumer side.
5261 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
5262 relayd_net_seq_idx
= 1;
5263 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
5265 DBG("Command subsystem initialized");