2 * Copyright (C) 2012 David Goulet <dgoulet@efficios.com>
3 * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * SPDX-License-Identifier: GPL-2.0-only
9 #include "bin/lttng-sessiond/tracker.h"
10 #include "lttng/lttng-error.h"
11 #include "lttng/tracker.h"
15 #include <urcu/list.h>
16 #include <urcu/uatomic.h>
20 #include <common/defaults.h>
21 #include <common/common.h>
22 #include <common/sessiond-comm/sessiond-comm.h>
23 #include <common/relayd/relayd.h>
24 #include <common/utils.h>
25 #include <common/compat/string.h>
26 #include <common/kernel-ctl/kernel-ctl.h>
27 #include <common/dynamic-buffer.h>
28 #include <common/buffer-view.h>
29 #include <common/trace-chunk.h>
30 #include <lttng/location-internal.h>
31 #include <lttng/trigger/trigger-internal.h>
32 #include <lttng/condition/condition.h>
33 #include <lttng/action/action.h>
34 #include <lttng/channel.h>
35 #include <lttng/channel-internal.h>
36 #include <lttng/rotate-internal.h>
37 #include <lttng/location-internal.h>
38 #include <lttng/session-internal.h>
39 #include <lttng/userspace-probe-internal.h>
40 #include <lttng/session-descriptor-internal.h>
41 #include <common/string-utils/string-utils.h>
46 #include "health-sessiond.h"
48 #include "kernel-consumer.h"
49 #include "lttng-sessiond.h"
51 #include "lttng-syscall.h"
53 #include "buffer-registry.h"
54 #include "notification-thread.h"
55 #include "notification-thread-commands.h"
57 #include "rotation-thread.h"
59 #include "agent-thread.h"
63 /* Sleep for 100ms between each check for the shm path's deletion. */
64 #define SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US 100000
66 struct cmd_destroy_session_reply_context
{
68 bool implicit_rotation_on_destroy
;
70 * Indicates whether or not an error occurred while launching the
71 * destruction of a session.
73 enum lttng_error_code destruction_status
;
76 static enum lttng_error_code
wait_on_path(void *path
);
79 * Command completion handler that is used by the destroy command
80 * when a session that has a non-default shm_path is being destroyed.
82 * See comment in cmd_destroy_session() for the rationale.
84 static struct destroy_completion_handler
{
85 struct cmd_completion_handler handler
;
86 char shm_path
[member_sizeof(struct ltt_session
, shm_path
)];
87 } destroy_completion_handler
= {
90 .data
= destroy_completion_handler
.shm_path
95 static struct cmd_completion_handler
*current_completion_handler
;
98 * Used to keep a unique index for each relayd socket created where this value
99 * is associated with streams on the consumer so it can match the right relayd
100 * to send to. It must be accessed with the relayd_net_seq_idx_lock
103 static pthread_mutex_t relayd_net_seq_idx_lock
= PTHREAD_MUTEX_INITIALIZER
;
104 static uint64_t relayd_net_seq_idx
;
106 static int validate_ust_event_name(const char *);
107 static int cmd_enable_event_internal(struct ltt_session
*session
,
108 const struct lttng_domain
*domain
,
109 char *channel_name
, struct lttng_event
*event
,
110 char *filter_expression
,
111 struct lttng_filter_bytecode
*filter
,
112 struct lttng_event_exclusion
*exclusion
,
116 * Create a session path used by list_lttng_sessions for the case that the
117 * session consumer is on the network.
119 static int build_network_session_path(char *dst
, size_t size
,
120 struct ltt_session
*session
)
122 int ret
, kdata_port
, udata_port
;
123 struct lttng_uri
*kuri
= NULL
, *uuri
= NULL
, *uri
= NULL
;
124 char tmp_uurl
[PATH_MAX
], tmp_urls
[PATH_MAX
];
129 memset(tmp_urls
, 0, sizeof(tmp_urls
));
130 memset(tmp_uurl
, 0, sizeof(tmp_uurl
));
132 kdata_port
= udata_port
= DEFAULT_NETWORK_DATA_PORT
;
134 if (session
->kernel_session
&& session
->kernel_session
->consumer
) {
135 kuri
= &session
->kernel_session
->consumer
->dst
.net
.control
;
136 kdata_port
= session
->kernel_session
->consumer
->dst
.net
.data
.port
;
139 if (session
->ust_session
&& session
->ust_session
->consumer
) {
140 uuri
= &session
->ust_session
->consumer
->dst
.net
.control
;
141 udata_port
= session
->ust_session
->consumer
->dst
.net
.data
.port
;
144 if (uuri
== NULL
&& kuri
== NULL
) {
145 uri
= &session
->consumer
->dst
.net
.control
;
146 kdata_port
= session
->consumer
->dst
.net
.data
.port
;
147 } else if (kuri
&& uuri
) {
148 ret
= uri_compare(kuri
, uuri
);
152 /* Build uuri URL string */
153 ret
= uri_to_str_url(uuri
, tmp_uurl
, sizeof(tmp_uurl
));
160 } else if (kuri
&& uuri
== NULL
) {
162 } else if (uuri
&& kuri
== NULL
) {
166 ret
= uri_to_str_url(uri
, tmp_urls
, sizeof(tmp_urls
));
172 * Do we have a UST url set. If yes, this means we have both kernel and UST
175 if (*tmp_uurl
!= '\0') {
176 ret
= snprintf(dst
, size
, "[K]: %s [data: %d] -- [U]: %s [data: %d]",
177 tmp_urls
, kdata_port
, tmp_uurl
, udata_port
);
180 if (kuri
|| (!kuri
&& !uuri
)) {
183 /* No kernel URI, use the UST port. */
186 ret
= snprintf(dst
, size
, "%s [data: %d]", tmp_urls
, dport
);
194 * Get run-time attributes if the session has been started (discarded events,
197 static int get_kernel_runtime_stats(struct ltt_session
*session
,
198 struct ltt_kernel_channel
*kchan
, uint64_t *discarded_events
,
199 uint64_t *lost_packets
)
203 if (!session
->has_been_started
) {
205 *discarded_events
= 0;
210 ret
= consumer_get_discarded_events(session
->id
, kchan
->key
,
211 session
->kernel_session
->consumer
,
217 ret
= consumer_get_lost_packets(session
->id
, kchan
->key
,
218 session
->kernel_session
->consumer
,
229 * Get run-time attributes if the session has been started (discarded events,
232 static int get_ust_runtime_stats(struct ltt_session
*session
,
233 struct ltt_ust_channel
*uchan
, uint64_t *discarded_events
,
234 uint64_t *lost_packets
)
237 struct ltt_ust_session
*usess
;
239 if (!discarded_events
|| !lost_packets
) {
244 usess
= session
->ust_session
;
245 assert(discarded_events
);
246 assert(lost_packets
);
248 if (!usess
|| !session
->has_been_started
) {
249 *discarded_events
= 0;
255 if (usess
->buffer_type
== LTTNG_BUFFER_PER_UID
) {
256 ret
= ust_app_uid_get_channel_runtime_stats(usess
->id
,
257 &usess
->buffer_reg_uid_list
,
258 usess
->consumer
, uchan
->id
,
259 uchan
->attr
.overwrite
,
262 } else if (usess
->buffer_type
== LTTNG_BUFFER_PER_PID
) {
263 ret
= ust_app_pid_get_channel_runtime_stats(usess
,
264 uchan
, usess
->consumer
,
265 uchan
->attr
.overwrite
,
271 *discarded_events
+= uchan
->per_pid_closed_app_discarded
;
272 *lost_packets
+= uchan
->per_pid_closed_app_lost
;
274 ERR("Unsupported buffer type");
285 * Fill lttng_channel array of all channels.
287 static ssize_t
list_lttng_channels(enum lttng_domain_type domain
,
288 struct ltt_session
*session
, struct lttng_channel
*channels
,
289 struct lttng_channel_extended
*chan_exts
)
292 struct ltt_kernel_channel
*kchan
;
294 DBG("Listing channels for session %s", session
->name
);
297 case LTTNG_DOMAIN_KERNEL
:
298 /* Kernel channels */
299 if (session
->kernel_session
!= NULL
) {
300 cds_list_for_each_entry(kchan
,
301 &session
->kernel_session
->channel_list
.head
, list
) {
302 uint64_t discarded_events
, lost_packets
;
303 struct lttng_channel_extended
*extended
;
305 extended
= (struct lttng_channel_extended
*)
306 kchan
->channel
->attr
.extended
.ptr
;
308 ret
= get_kernel_runtime_stats(session
, kchan
,
309 &discarded_events
, &lost_packets
);
313 /* Copy lttng_channel struct to array */
314 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
315 channels
[i
].enabled
= kchan
->enabled
;
316 chan_exts
[i
].discarded_events
=
318 chan_exts
[i
].lost_packets
= lost_packets
;
319 chan_exts
[i
].monitor_timer_interval
=
320 extended
->monitor_timer_interval
;
321 chan_exts
[i
].blocking_timeout
= 0;
326 case LTTNG_DOMAIN_UST
:
328 struct lttng_ht_iter iter
;
329 struct ltt_ust_channel
*uchan
;
332 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
333 &iter
.iter
, uchan
, node
.node
) {
334 uint64_t discarded_events
= 0, lost_packets
= 0;
336 if (lttng_strncpy(channels
[i
].name
, uchan
->name
,
337 LTTNG_SYMBOL_NAME_LEN
)) {
340 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
341 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
342 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
343 channels
[i
].attr
.switch_timer_interval
=
344 uchan
->attr
.switch_timer_interval
;
345 channels
[i
].attr
.read_timer_interval
=
346 uchan
->attr
.read_timer_interval
;
347 channels
[i
].enabled
= uchan
->enabled
;
348 channels
[i
].attr
.tracefile_size
= uchan
->tracefile_size
;
349 channels
[i
].attr
.tracefile_count
= uchan
->tracefile_count
;
352 * Map enum lttng_ust_output to enum lttng_event_output.
354 switch (uchan
->attr
.output
) {
356 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
360 * LTTNG_UST_MMAP is the only supported UST
367 chan_exts
[i
].monitor_timer_interval
=
368 uchan
->monitor_timer_interval
;
369 chan_exts
[i
].blocking_timeout
=
370 uchan
->attr
.u
.s
.blocking_timeout
;
372 ret
= get_ust_runtime_stats(session
, uchan
,
373 &discarded_events
, &lost_packets
);
377 chan_exts
[i
].discarded_events
= discarded_events
;
378 chan_exts
[i
].lost_packets
= lost_packets
;
390 return -LTTNG_ERR_FATAL
;
396 static int increment_extended_len(const char *filter_expression
,
397 struct lttng_event_exclusion
*exclusion
,
398 const struct lttng_userspace_probe_location
*probe_location
,
399 size_t *extended_len
)
403 *extended_len
+= sizeof(struct lttcomm_event_extended_header
);
405 if (filter_expression
) {
406 *extended_len
+= strlen(filter_expression
) + 1;
410 *extended_len
+= exclusion
->count
* LTTNG_SYMBOL_NAME_LEN
;
413 if (probe_location
) {
414 ret
= lttng_userspace_probe_location_serialize(probe_location
,
419 *extended_len
+= ret
;
426 static int append_extended_info(const char *filter_expression
,
427 struct lttng_event_exclusion
*exclusion
,
428 struct lttng_userspace_probe_location
*probe_location
,
432 size_t filter_len
= 0;
433 size_t nb_exclusions
= 0;
434 size_t userspace_probe_location_len
= 0;
435 struct lttng_dynamic_buffer location_buffer
;
436 struct lttcomm_event_extended_header extended_header
;
438 if (filter_expression
) {
439 filter_len
= strlen(filter_expression
) + 1;
443 nb_exclusions
= exclusion
->count
;
446 if (probe_location
) {
447 lttng_dynamic_buffer_init(&location_buffer
);
448 ret
= lttng_userspace_probe_location_serialize(probe_location
,
449 &location_buffer
, NULL
);
454 userspace_probe_location_len
= location_buffer
.size
;
457 /* Set header fields */
458 extended_header
.filter_len
= filter_len
;
459 extended_header
.nb_exclusions
= nb_exclusions
;
460 extended_header
.userspace_probe_location_len
= userspace_probe_location_len
;
463 memcpy(*extended_at
, &extended_header
, sizeof(extended_header
));
464 *extended_at
+= sizeof(extended_header
);
466 /* Copy filter string */
467 if (filter_expression
) {
468 memcpy(*extended_at
, filter_expression
, filter_len
);
469 *extended_at
+= filter_len
;
472 /* Copy exclusion names */
474 size_t len
= nb_exclusions
* LTTNG_SYMBOL_NAME_LEN
;
476 memcpy(*extended_at
, &exclusion
->names
, len
);
480 if (probe_location
) {
481 memcpy(*extended_at
, location_buffer
.data
, location_buffer
.size
);
482 *extended_at
+= location_buffer
.size
;
483 lttng_dynamic_buffer_reset(&location_buffer
);
491 * Create a list of agent domain events.
493 * Return number of events in list on success or else a negative value.
495 static int list_lttng_agent_events(struct agent
*agt
,
496 struct lttng_event
**events
, size_t *total_size
)
499 unsigned int nb_event
= 0;
500 struct agent_event
*event
;
501 struct lttng_event
*tmp_events
= NULL
;
502 struct lttng_ht_iter iter
;
503 size_t extended_len
= 0;
509 DBG3("Listing agent events");
512 nb_event
= lttng_ht_get_count(agt
->events
);
520 /* Compute required extended infos size */
521 extended_len
= nb_event
* sizeof(struct lttcomm_event_extended_header
);
524 * This is only valid because the commands which add events are
525 * processed in the same thread as the listing.
528 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
529 ret
= increment_extended_len(event
->filter_expression
, NULL
, NULL
,
532 DBG("Error computing the length of extended info message");
533 ret
= -LTTNG_ERR_FATAL
;
539 *total_size
= nb_event
* sizeof(*tmp_events
) + extended_len
;
540 tmp_events
= zmalloc(*total_size
);
542 PERROR("zmalloc agent events session");
543 ret
= -LTTNG_ERR_FATAL
;
547 extended_at
= ((uint8_t *) tmp_events
) +
548 nb_event
* sizeof(struct lttng_event
);
551 cds_lfht_for_each_entry(agt
->events
->ht
, &iter
.iter
, event
, node
.node
) {
552 strncpy(tmp_events
[i
].name
, event
->name
, sizeof(tmp_events
[i
].name
));
553 tmp_events
[i
].name
[sizeof(tmp_events
[i
].name
) - 1] = '\0';
554 tmp_events
[i
].enabled
= event
->enabled
;
555 tmp_events
[i
].loglevel
= event
->loglevel_value
;
556 tmp_events
[i
].loglevel_type
= event
->loglevel_type
;
559 /* Append extended info */
560 ret
= append_extended_info(event
->filter_expression
, NULL
, NULL
,
563 DBG("Error appending extended info message");
564 ret
= -LTTNG_ERR_FATAL
;
569 *events
= tmp_events
;
571 assert(nb_event
== i
);
582 * Create a list of ust global domain events.
584 static int list_lttng_ust_global_events(char *channel_name
,
585 struct ltt_ust_domain_global
*ust_global
,
586 struct lttng_event
**events
, size_t *total_size
)
589 unsigned int nb_event
= 0;
590 struct lttng_ht_iter iter
;
591 struct lttng_ht_node_str
*node
;
592 struct ltt_ust_channel
*uchan
;
593 struct ltt_ust_event
*uevent
;
594 struct lttng_event
*tmp
;
595 size_t extended_len
= 0;
598 DBG("Listing UST global events for channel %s", channel_name
);
602 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
603 node
= lttng_ht_iter_get_node_str(&iter
);
605 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
609 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
611 nb_event
= lttng_ht_get_count(uchan
->events
);
618 DBG3("Listing UST global %d events", nb_event
);
620 /* Compute required extended infos size */
621 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
622 if (uevent
->internal
) {
627 ret
= increment_extended_len(uevent
->filter_expression
,
628 uevent
->exclusion
, NULL
, &extended_len
);
630 DBG("Error computing the length of extended info message");
631 ret
= -LTTNG_ERR_FATAL
;
636 /* All events are internal, skip. */
642 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
643 tmp
= zmalloc(*total_size
);
645 ret
= -LTTNG_ERR_FATAL
;
649 extended_at
= ((uint8_t *) tmp
) + nb_event
* sizeof(struct lttng_event
);
651 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
652 if (uevent
->internal
) {
653 /* This event should remain hidden from clients */
656 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
657 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
658 tmp
[i
].enabled
= uevent
->enabled
;
660 switch (uevent
->attr
.instrumentation
) {
661 case LTTNG_UST_TRACEPOINT
:
662 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
664 case LTTNG_UST_PROBE
:
665 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
667 case LTTNG_UST_FUNCTION
:
668 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
672 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
673 switch (uevent
->attr
.loglevel_type
) {
674 case LTTNG_UST_LOGLEVEL_ALL
:
675 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
677 case LTTNG_UST_LOGLEVEL_RANGE
:
678 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
680 case LTTNG_UST_LOGLEVEL_SINGLE
:
681 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
684 if (uevent
->filter
) {
687 if (uevent
->exclusion
) {
688 tmp
[i
].exclusion
= 1;
692 /* Append extended info */
693 ret
= append_extended_info(uevent
->filter_expression
,
694 uevent
->exclusion
, NULL
, &extended_at
);
696 DBG("Error appending extended info message");
697 ret
= -LTTNG_ERR_FATAL
;
710 * Fill lttng_event array of all kernel events in the channel.
712 static int list_lttng_kernel_events(char *channel_name
,
713 struct ltt_kernel_session
*kernel_session
,
714 struct lttng_event
**events
, size_t *total_size
)
717 unsigned int nb_event
;
718 struct ltt_kernel_event
*event
;
719 struct ltt_kernel_channel
*kchan
;
720 size_t extended_len
= 0;
723 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
725 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
729 nb_event
= kchan
->event_count
;
731 DBG("Listing events for channel %s", kchan
->channel
->name
);
739 /* Compute required extended infos size */
740 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
741 ret
= increment_extended_len(event
->filter_expression
, NULL
,
742 event
->userspace_probe_location
,
745 DBG("Error computing the length of extended info message");
746 ret
= -LTTNG_ERR_FATAL
;
751 *total_size
= nb_event
* sizeof(struct lttng_event
) + extended_len
;
752 *events
= zmalloc(*total_size
);
753 if (*events
== NULL
) {
754 ret
= -LTTNG_ERR_FATAL
;
758 extended_at
= ((void *) *events
) +
759 nb_event
* sizeof(struct lttng_event
);
761 /* Kernel channels */
762 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
763 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
764 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
765 (*events
)[i
].enabled
= event
->enabled
;
766 (*events
)[i
].filter
=
767 (unsigned char) !!event
->filter_expression
;
769 switch (event
->event
->instrumentation
) {
770 case LTTNG_KERNEL_TRACEPOINT
:
771 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
773 case LTTNG_KERNEL_KRETPROBE
:
774 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
775 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
776 sizeof(struct lttng_kernel_kprobe
));
778 case LTTNG_KERNEL_KPROBE
:
779 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
780 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
781 sizeof(struct lttng_kernel_kprobe
));
783 case LTTNG_KERNEL_UPROBE
:
784 (*events
)[i
].type
= LTTNG_EVENT_USERSPACE_PROBE
;
786 case LTTNG_KERNEL_FUNCTION
:
787 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
788 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
789 sizeof(struct lttng_kernel_function
));
791 case LTTNG_KERNEL_NOOP
:
792 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
794 case LTTNG_KERNEL_SYSCALL
:
795 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
797 case LTTNG_KERNEL_ALL
:
805 /* Append extended info */
806 ret
= append_extended_info(event
->filter_expression
, NULL
,
807 event
->userspace_probe_location
, &extended_at
);
809 DBG("Error appending extended info message");
810 ret
= -LTTNG_ERR_FATAL
;
819 /* Negate the error code to differentiate the size from an error */
824 * Add URI so the consumer output object. Set the correct path depending on the
825 * domain adding the default trace directory.
827 static enum lttng_error_code
add_uri_to_consumer(
828 const struct ltt_session
*session
,
829 struct consumer_output
*consumer
,
830 struct lttng_uri
*uri
, enum lttng_domain_type domain
)
833 enum lttng_error_code ret_code
= LTTNG_OK
;
837 if (consumer
== NULL
) {
838 DBG("No consumer detected. Don't add URI. Stopping.");
839 ret_code
= LTTNG_ERR_NO_CONSUMER
;
844 case LTTNG_DOMAIN_KERNEL
:
845 ret
= lttng_strncpy(consumer
->domain_subdir
,
846 DEFAULT_KERNEL_TRACE_DIR
,
847 sizeof(consumer
->domain_subdir
));
849 case LTTNG_DOMAIN_UST
:
850 ret
= lttng_strncpy(consumer
->domain_subdir
,
851 DEFAULT_UST_TRACE_DIR
,
852 sizeof(consumer
->domain_subdir
));
856 * This case is possible is we try to add the URI to the global
857 * tracing session consumer object which in this case there is
860 memset(consumer
->domain_subdir
, 0,
861 sizeof(consumer
->domain_subdir
));
865 ERR("Failed to initialize consumer output domain subdirectory");
866 ret_code
= LTTNG_ERR_FATAL
;
870 switch (uri
->dtype
) {
873 DBG2("Setting network URI to consumer");
875 if (consumer
->type
== CONSUMER_DST_NET
) {
876 if ((uri
->stype
== LTTNG_STREAM_CONTROL
&&
877 consumer
->dst
.net
.control_isset
) ||
878 (uri
->stype
== LTTNG_STREAM_DATA
&&
879 consumer
->dst
.net
.data_isset
)) {
880 ret_code
= LTTNG_ERR_URL_EXIST
;
884 memset(&consumer
->dst
, 0, sizeof(consumer
->dst
));
887 /* Set URI into consumer output object */
888 ret
= consumer_set_network_uri(session
, consumer
, uri
);
892 } else if (ret
== 1) {
894 * URI was the same in the consumer so we do not append the subdir
895 * again so to not duplicate output dir.
902 if (*uri
->dst
.path
!= '/' || strstr(uri
->dst
.path
, "../")) {
903 ret_code
= LTTNG_ERR_INVALID
;
906 DBG2("Setting trace directory path from URI to %s",
908 memset(&consumer
->dst
, 0, sizeof(consumer
->dst
));
910 ret
= lttng_strncpy(consumer
->dst
.session_root_path
,
912 sizeof(consumer
->dst
.session_root_path
));
914 ret_code
= LTTNG_ERR_FATAL
;
917 consumer
->type
= CONSUMER_DST_LOCAL
;
927 * Init tracing by creating trace directory and sending fds kernel consumer.
929 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
932 struct lttng_ht_iter iter
;
933 struct consumer_socket
*socket
;
939 if (session
->consumer_fds_sent
== 0 && session
->consumer
!= NULL
) {
940 cds_lfht_for_each_entry(session
->consumer
->socks
->ht
, &iter
.iter
,
942 pthread_mutex_lock(socket
->lock
);
943 ret
= kernel_consumer_send_session(socket
, session
);
944 pthread_mutex_unlock(socket
->lock
);
946 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
958 * Create a socket to the relayd using the URI.
960 * On success, the relayd_sock pointer is set to the created socket.
961 * Else, it remains untouched and an LTTng error code is returned.
963 static enum lttng_error_code
create_connect_relayd(struct lttng_uri
*uri
,
964 struct lttcomm_relayd_sock
**relayd_sock
,
965 struct consumer_output
*consumer
)
968 enum lttng_error_code status
= LTTNG_OK
;
969 struct lttcomm_relayd_sock
*rsock
;
971 rsock
= lttcomm_alloc_relayd_sock(uri
, RELAYD_VERSION_COMM_MAJOR
,
972 RELAYD_VERSION_COMM_MINOR
);
974 status
= LTTNG_ERR_FATAL
;
979 * Connect to relayd so we can proceed with a session creation. This call
980 * can possibly block for an arbitrary amount of time to set the health
981 * state to be in poll execution.
984 ret
= relayd_connect(rsock
);
987 ERR("Unable to reach lttng-relayd");
988 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
992 /* Create socket for control stream. */
993 if (uri
->stype
== LTTNG_STREAM_CONTROL
) {
994 uint64_t result_flags
;
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 ret
= relayd_get_configuration(rsock
, 0,
1013 ERR("Unable to get relayd configuration");
1014 status
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
1017 if (result_flags
& LTTCOMM_RELAYD_CONFIGURATION_FLAG_CLEAR_ALLOWED
) {
1018 consumer
->relay_allows_clear
= true;
1020 } else if (uri
->stype
== LTTNG_STREAM_DATA
) {
1021 DBG3("Creating relayd data socket from URI");
1023 /* Command is not valid */
1024 ERR("Relayd invalid stream type: %d", uri
->stype
);
1025 status
= LTTNG_ERR_INVALID
;
1029 *relayd_sock
= rsock
;
1034 /* The returned value is not useful since we are on an error path. */
1035 (void) relayd_close(rsock
);
1043 * Connect to the relayd using URI and send the socket to the right consumer.
1045 * The consumer socket lock must be held by the caller.
1047 * Returns LTTNG_OK on success or an LTTng error code on failure.
1049 static enum lttng_error_code
send_consumer_relayd_socket(
1050 unsigned int session_id
,
1051 struct lttng_uri
*relayd_uri
,
1052 struct consumer_output
*consumer
,
1053 struct consumer_socket
*consumer_sock
,
1054 const char *session_name
, const char *hostname
,
1055 const char *base_path
, int session_live_timer
,
1056 const uint64_t *current_chunk_id
,
1057 time_t session_creation_time
,
1058 bool session_name_contains_creation_time
)
1061 struct lttcomm_relayd_sock
*rsock
= NULL
;
1062 enum lttng_error_code status
;
1064 /* Connect to relayd and make version check if uri is the control. */
1065 status
= create_connect_relayd(relayd_uri
, &rsock
, consumer
);
1066 if (status
!= LTTNG_OK
) {
1067 goto relayd_comm_error
;
1071 /* Set the network sequence index if not set. */
1072 if (consumer
->net_seq_index
== (uint64_t) -1ULL) {
1073 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
1075 * Increment net_seq_idx because we are about to transfer the
1076 * new relayd socket to the consumer.
1077 * Assign unique key so the consumer can match streams.
1079 consumer
->net_seq_index
= ++relayd_net_seq_idx
;
1080 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
1083 /* Send relayd socket to consumer. */
1084 ret
= consumer_send_relayd_socket(consumer_sock
, rsock
, consumer
,
1085 relayd_uri
->stype
, session_id
,
1086 session_name
, hostname
, base_path
,
1087 session_live_timer
, current_chunk_id
,
1088 session_creation_time
, session_name_contains_creation_time
);
1090 status
= LTTNG_ERR_ENABLE_CONSUMER_FAIL
;
1094 /* Flag that the corresponding socket was sent. */
1095 if (relayd_uri
->stype
== LTTNG_STREAM_CONTROL
) {
1096 consumer_sock
->control_sock_sent
= 1;
1097 } else if (relayd_uri
->stype
== LTTNG_STREAM_DATA
) {
1098 consumer_sock
->data_sock_sent
= 1;
1102 * Close socket which was dup on the consumer side. The session daemon does
1103 * NOT keep track of the relayd socket(s) once transfer to the consumer.
1107 if (status
!= LTTNG_OK
) {
1109 * The consumer output for this session should not be used anymore
1110 * since the relayd connection failed thus making any tracing or/and
1111 * streaming not usable.
1113 consumer
->enabled
= 0;
1115 (void) relayd_close(rsock
);
1123 * Send both relayd sockets to a specific consumer and domain. This is a
1124 * helper function to facilitate sending the information to the consumer for a
1127 * The consumer socket lock must be held by the caller.
1129 * Returns LTTNG_OK, or an LTTng error code on failure.
1131 static enum lttng_error_code
send_consumer_relayd_sockets(
1132 enum lttng_domain_type domain
,
1133 unsigned int session_id
, struct consumer_output
*consumer
,
1134 struct consumer_socket
*sock
, const char *session_name
,
1135 const char *hostname
, const char *base_path
, int session_live_timer
,
1136 const uint64_t *current_chunk_id
, time_t session_creation_time
,
1137 bool session_name_contains_creation_time
)
1139 enum lttng_error_code status
= LTTNG_OK
;
1144 /* Sending control relayd socket. */
1145 if (!sock
->control_sock_sent
) {
1146 status
= send_consumer_relayd_socket(session_id
,
1147 &consumer
->dst
.net
.control
, consumer
, sock
,
1148 session_name
, hostname
, base_path
, session_live_timer
,
1149 current_chunk_id
, session_creation_time
,
1150 session_name_contains_creation_time
);
1151 if (status
!= LTTNG_OK
) {
1156 /* Sending data relayd socket. */
1157 if (!sock
->data_sock_sent
) {
1158 status
= send_consumer_relayd_socket(session_id
,
1159 &consumer
->dst
.net
.data
, consumer
, sock
,
1160 session_name
, hostname
, base_path
, session_live_timer
,
1161 current_chunk_id
, session_creation_time
,
1162 session_name_contains_creation_time
);
1163 if (status
!= LTTNG_OK
) {
1173 * Setup relayd connections for a tracing session. First creates the socket to
1174 * the relayd and send them to the right domain consumer. Consumer type MUST be
1177 int cmd_setup_relayd(struct ltt_session
*session
)
1180 struct ltt_ust_session
*usess
;
1181 struct ltt_kernel_session
*ksess
;
1182 struct consumer_socket
*socket
;
1183 struct lttng_ht_iter iter
;
1184 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
1188 usess
= session
->ust_session
;
1189 ksess
= session
->kernel_session
;
1191 DBG("Setting relayd for session %s", session
->name
);
1194 if (session
->current_trace_chunk
) {
1195 enum lttng_trace_chunk_status status
= lttng_trace_chunk_get_id(
1196 session
->current_trace_chunk
, ¤t_chunk_id
.value
);
1198 if (status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
1199 current_chunk_id
.is_set
= true;
1201 ERR("Failed to get current trace chunk id");
1202 ret
= LTTNG_ERR_UNK
;
1207 if (usess
&& usess
->consumer
&& usess
->consumer
->type
== CONSUMER_DST_NET
1208 && usess
->consumer
->enabled
) {
1209 /* For each consumer socket, send relayd sockets */
1210 cds_lfht_for_each_entry(usess
->consumer
->socks
->ht
, &iter
.iter
,
1211 socket
, node
.node
) {
1212 pthread_mutex_lock(socket
->lock
);
1213 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_UST
, session
->id
,
1214 usess
->consumer
, socket
,
1215 session
->name
, session
->hostname
,
1217 session
->live_timer
,
1218 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1219 session
->creation_time
,
1220 session
->name_contains_creation_time
);
1221 pthread_mutex_unlock(socket
->lock
);
1222 if (ret
!= LTTNG_OK
) {
1225 /* Session is now ready for network streaming. */
1226 session
->net_handle
= 1;
1228 session
->consumer
->relay_major_version
=
1229 usess
->consumer
->relay_major_version
;
1230 session
->consumer
->relay_minor_version
=
1231 usess
->consumer
->relay_minor_version
;
1232 session
->consumer
->relay_allows_clear
=
1233 usess
->consumer
->relay_allows_clear
;
1236 if (ksess
&& ksess
->consumer
&& ksess
->consumer
->type
== CONSUMER_DST_NET
1237 && ksess
->consumer
->enabled
) {
1238 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
, &iter
.iter
,
1239 socket
, node
.node
) {
1240 pthread_mutex_lock(socket
->lock
);
1241 ret
= send_consumer_relayd_sockets(LTTNG_DOMAIN_KERNEL
, session
->id
,
1242 ksess
->consumer
, socket
,
1243 session
->name
, session
->hostname
,
1245 session
->live_timer
,
1246 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
1247 session
->creation_time
,
1248 session
->name_contains_creation_time
);
1249 pthread_mutex_unlock(socket
->lock
);
1250 if (ret
!= LTTNG_OK
) {
1253 /* Session is now ready for network streaming. */
1254 session
->net_handle
= 1;
1256 session
->consumer
->relay_major_version
=
1257 ksess
->consumer
->relay_major_version
;
1258 session
->consumer
->relay_minor_version
=
1259 ksess
->consumer
->relay_minor_version
;
1260 session
->consumer
->relay_allows_clear
=
1261 ksess
->consumer
->relay_allows_clear
;
1270 * Start a kernel session by opening all necessary streams.
1272 int start_kernel_session(struct ltt_kernel_session
*ksess
)
1275 struct ltt_kernel_channel
*kchan
;
1277 /* Open kernel metadata */
1278 if (ksess
->metadata
== NULL
&& ksess
->output_traces
) {
1279 ret
= kernel_open_metadata(ksess
);
1281 ret
= LTTNG_ERR_KERN_META_FAIL
;
1286 /* Open kernel metadata stream */
1287 if (ksess
->metadata
&& ksess
->metadata_stream_fd
< 0) {
1288 ret
= kernel_open_metadata_stream(ksess
);
1290 ERR("Kernel create metadata stream failed");
1291 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1296 /* For each channel */
1297 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1298 if (kchan
->stream_count
== 0) {
1299 ret
= kernel_open_channel_stream(kchan
);
1301 ret
= LTTNG_ERR_KERN_STREAM_FAIL
;
1304 /* Update the stream global counter */
1305 ksess
->stream_count_global
+= ret
;
1309 /* Setup kernel consumer socket and send fds to it */
1310 ret
= init_kernel_tracing(ksess
);
1312 ret
= LTTNG_ERR_KERN_START_FAIL
;
1316 /* This start the kernel tracing */
1317 ret
= kernel_start_session(ksess
);
1319 ret
= LTTNG_ERR_KERN_START_FAIL
;
1323 /* Quiescent wait after starting trace */
1324 kernel_wait_quiescent();
1334 int stop_kernel_session(struct ltt_kernel_session
*ksess
)
1336 struct ltt_kernel_channel
*kchan
;
1337 bool error_occurred
= false;
1340 if (!ksess
|| !ksess
->active
) {
1343 DBG("Stopping kernel tracing");
1345 ret
= kernel_stop_session(ksess
);
1347 ret
= LTTNG_ERR_KERN_STOP_FAIL
;
1351 kernel_wait_quiescent();
1353 /* Flush metadata after stopping (if exists) */
1354 if (ksess
->metadata_stream_fd
>= 0) {
1355 ret
= kernel_metadata_flush_buffer(ksess
->metadata_stream_fd
);
1357 ERR("Kernel metadata flush failed");
1358 error_occurred
= true;
1362 /* Flush all buffers after stopping */
1363 cds_list_for_each_entry(kchan
, &ksess
->channel_list
.head
, list
) {
1364 ret
= kernel_flush_buffer(kchan
);
1366 ERR("Kernel flush buffer error");
1367 error_occurred
= true;
1372 if (error_occurred
) {
1373 ret
= LTTNG_ERR_UNK
;
1382 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1384 int cmd_disable_channel(struct ltt_session
*session
,
1385 enum lttng_domain_type domain
, char *channel_name
)
1388 struct ltt_ust_session
*usess
;
1390 usess
= session
->ust_session
;
1395 case LTTNG_DOMAIN_KERNEL
:
1397 ret
= channel_kernel_disable(session
->kernel_session
,
1399 if (ret
!= LTTNG_OK
) {
1403 kernel_wait_quiescent();
1406 case LTTNG_DOMAIN_UST
:
1408 struct ltt_ust_channel
*uchan
;
1409 struct lttng_ht
*chan_ht
;
1411 chan_ht
= usess
->domain_global
.channels
;
1413 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
1414 if (uchan
== NULL
) {
1415 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1419 ret
= channel_ust_disable(usess
, uchan
);
1420 if (ret
!= LTTNG_OK
) {
1426 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1438 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
1440 * The wpipe arguments is used as a notifier for the kernel thread.
1442 int cmd_enable_channel(struct ltt_session
*session
,
1443 const struct lttng_domain
*domain
, const struct lttng_channel
*_attr
, int wpipe
)
1446 struct ltt_ust_session
*usess
= session
->ust_session
;
1447 struct lttng_ht
*chan_ht
;
1449 struct lttng_channel attr
;
1456 len
= lttng_strnlen(attr
.name
, sizeof(attr
.name
));
1458 /* Validate channel name */
1459 if (attr
.name
[0] == '.' ||
1460 memchr(attr
.name
, '/', len
) != NULL
) {
1461 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1465 DBG("Enabling channel %s for session %s", attr
.name
, session
->name
);
1470 * Don't try to enable a channel if the session has been started at
1471 * some point in time before. The tracer does not allow it.
1473 if (session
->has_been_started
) {
1474 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
1479 * If the session is a live session, remove the switch timer, the
1480 * live timer does the same thing but sends also synchronisation
1481 * beacons for inactive streams.
1483 if (session
->live_timer
> 0) {
1484 attr
.attr
.live_timer_interval
= session
->live_timer
;
1485 attr
.attr
.switch_timer_interval
= 0;
1488 /* Check for feature support */
1489 switch (domain
->type
) {
1490 case LTTNG_DOMAIN_KERNEL
:
1492 if (kernel_supports_ring_buffer_snapshot_sample_positions() != 1) {
1493 /* Sampling position of buffer is not supported */
1494 WARN("Kernel tracer does not support buffer monitoring. "
1495 "Setting the monitor interval timer to 0 "
1496 "(disabled) for channel '%s' of session '%s'",
1497 attr
.name
, session
->name
);
1498 lttng_channel_set_monitor_timer_interval(&attr
, 0);
1502 case LTTNG_DOMAIN_UST
:
1504 case LTTNG_DOMAIN_JUL
:
1505 case LTTNG_DOMAIN_LOG4J
:
1506 case LTTNG_DOMAIN_PYTHON
:
1507 if (!agent_tracing_is_enabled()) {
1508 DBG("Attempted to enable a channel in an agent domain but the agent thread is not running");
1509 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
1514 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1518 switch (domain
->type
) {
1519 case LTTNG_DOMAIN_KERNEL
:
1521 struct ltt_kernel_channel
*kchan
;
1523 kchan
= trace_kernel_get_channel_by_name(attr
.name
,
1524 session
->kernel_session
);
1525 if (kchan
== NULL
) {
1526 if (session
->snapshot
.nb_output
> 0 ||
1527 session
->snapshot_mode
) {
1528 /* Enforce mmap output for snapshot sessions. */
1529 attr
.attr
.output
= LTTNG_EVENT_MMAP
;
1531 ret
= channel_kernel_create(session
->kernel_session
, &attr
, wpipe
);
1532 if (attr
.name
[0] != '\0') {
1533 session
->kernel_session
->has_non_default_channel
= 1;
1536 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
1539 if (ret
!= LTTNG_OK
) {
1543 kernel_wait_quiescent();
1546 case LTTNG_DOMAIN_UST
:
1547 case LTTNG_DOMAIN_JUL
:
1548 case LTTNG_DOMAIN_LOG4J
:
1549 case LTTNG_DOMAIN_PYTHON
:
1551 struct ltt_ust_channel
*uchan
;
1556 * Current agent implementation limitations force us to allow
1557 * only one channel at once in "agent" subdomains. Each
1558 * subdomain has a default channel name which must be strictly
1561 if (domain
->type
== LTTNG_DOMAIN_JUL
) {
1562 if (strncmp(attr
.name
, DEFAULT_JUL_CHANNEL_NAME
,
1563 LTTNG_SYMBOL_NAME_LEN
)) {
1564 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1567 } else if (domain
->type
== LTTNG_DOMAIN_LOG4J
) {
1568 if (strncmp(attr
.name
, DEFAULT_LOG4J_CHANNEL_NAME
,
1569 LTTNG_SYMBOL_NAME_LEN
)) {
1570 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1573 } else if (domain
->type
== LTTNG_DOMAIN_PYTHON
) {
1574 if (strncmp(attr
.name
, DEFAULT_PYTHON_CHANNEL_NAME
,
1575 LTTNG_SYMBOL_NAME_LEN
)) {
1576 ret
= LTTNG_ERR_INVALID_CHANNEL_NAME
;
1581 chan_ht
= usess
->domain_global
.channels
;
1583 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
.name
);
1584 if (uchan
== NULL
) {
1585 ret
= channel_ust_create(usess
, &attr
, domain
->buf_type
);
1586 if (attr
.name
[0] != '\0') {
1587 usess
->has_non_default_channel
= 1;
1590 ret
= channel_ust_enable(usess
, uchan
);
1595 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
1599 if (ret
== LTTNG_OK
&& attr
.attr
.output
!= LTTNG_EVENT_MMAP
) {
1600 session
->has_non_mmap_channel
= true;
1608 enum lttng_error_code
cmd_process_attr_tracker_get_tracking_policy(
1609 struct ltt_session
*session
,
1610 enum lttng_domain_type domain
,
1611 enum lttng_process_attr process_attr
,
1612 enum lttng_tracking_policy
*policy
)
1614 enum lttng_error_code ret_code
= LTTNG_OK
;
1615 const struct process_attr_tracker
*tracker
;
1618 case LTTNG_DOMAIN_KERNEL
:
1619 if (!session
->kernel_session
) {
1620 ret_code
= LTTNG_ERR_INVALID
;
1623 tracker
= kernel_get_process_attr_tracker(
1624 session
->kernel_session
, process_attr
);
1626 case LTTNG_DOMAIN_UST
:
1627 if (!session
->ust_session
) {
1628 ret_code
= LTTNG_ERR_INVALID
;
1631 tracker
= trace_ust_get_process_attr_tracker(
1632 session
->ust_session
, process_attr
);
1635 ret_code
= LTTNG_ERR_UNSUPPORTED_DOMAIN
;
1639 *policy
= process_attr_tracker_get_tracking_policy(tracker
);
1641 ret_code
= LTTNG_ERR_INVALID
;
1647 enum lttng_error_code
cmd_process_attr_tracker_set_tracking_policy(
1648 struct ltt_session
*session
,
1649 enum lttng_domain_type domain
,
1650 enum lttng_process_attr process_attr
,
1651 enum lttng_tracking_policy policy
)
1653 enum lttng_error_code ret_code
= LTTNG_OK
;
1656 case LTTNG_TRACKING_POLICY_INCLUDE_SET
:
1657 case LTTNG_TRACKING_POLICY_EXCLUDE_ALL
:
1658 case LTTNG_TRACKING_POLICY_INCLUDE_ALL
:
1661 ret_code
= LTTNG_ERR_INVALID
;
1666 case LTTNG_DOMAIN_KERNEL
:
1667 if (!session
->kernel_session
) {
1668 ret_code
= LTTNG_ERR_INVALID
;
1671 ret_code
= kernel_process_attr_tracker_set_tracking_policy(
1672 session
->kernel_session
, process_attr
, policy
);
1674 case LTTNG_DOMAIN_UST
:
1675 if (!session
->ust_session
) {
1676 ret_code
= LTTNG_ERR_INVALID
;
1679 ret_code
= trace_ust_process_attr_tracker_set_tracking_policy(
1680 session
->ust_session
, process_attr
, policy
);
1683 ret_code
= LTTNG_ERR_UNSUPPORTED_DOMAIN
;
1690 enum lttng_error_code
cmd_process_attr_tracker_inclusion_set_add_value(
1691 struct ltt_session
*session
,
1692 enum lttng_domain_type domain
,
1693 enum lttng_process_attr process_attr
,
1694 const struct process_attr_value
*value
)
1696 enum lttng_error_code ret_code
= LTTNG_OK
;
1699 case LTTNG_DOMAIN_KERNEL
:
1700 if (!session
->kernel_session
) {
1701 ret_code
= LTTNG_ERR_INVALID
;
1704 ret_code
= kernel_process_attr_tracker_inclusion_set_add_value(
1705 session
->kernel_session
, process_attr
, value
);
1707 case LTTNG_DOMAIN_UST
:
1708 if (!session
->ust_session
) {
1709 ret_code
= LTTNG_ERR_INVALID
;
1712 ret_code
= trace_ust_process_attr_tracker_inclusion_set_add_value(
1713 session
->ust_session
, process_attr
, value
);
1716 ret_code
= LTTNG_ERR_UNSUPPORTED_DOMAIN
;
1723 enum lttng_error_code
cmd_process_attr_tracker_inclusion_set_remove_value(
1724 struct ltt_session
*session
,
1725 enum lttng_domain_type domain
,
1726 enum lttng_process_attr process_attr
,
1727 const struct process_attr_value
*value
)
1729 enum lttng_error_code ret_code
= LTTNG_OK
;
1732 case LTTNG_DOMAIN_KERNEL
:
1733 if (!session
->kernel_session
) {
1734 ret_code
= LTTNG_ERR_INVALID
;
1737 ret_code
= kernel_process_attr_tracker_inclusion_set_remove_value(
1738 session
->kernel_session
, process_attr
, value
);
1740 case LTTNG_DOMAIN_UST
:
1741 if (!session
->ust_session
) {
1742 ret_code
= LTTNG_ERR_INVALID
;
1745 ret_code
= trace_ust_process_attr_tracker_inclusion_set_remove_value(
1746 session
->ust_session
, process_attr
, value
);
1749 ret_code
= LTTNG_ERR_UNSUPPORTED_DOMAIN
;
1756 enum lttng_error_code
cmd_process_attr_tracker_get_inclusion_set(
1757 struct ltt_session
*session
,
1758 enum lttng_domain_type domain
,
1759 enum lttng_process_attr process_attr
,
1760 struct lttng_process_attr_values
**values
)
1762 enum lttng_error_code ret_code
= LTTNG_OK
;
1763 const struct process_attr_tracker
*tracker
;
1764 enum process_attr_tracker_status status
;
1767 case LTTNG_DOMAIN_KERNEL
:
1768 if (!session
->kernel_session
) {
1769 ret_code
= LTTNG_ERR_INVALID
;
1772 tracker
= kernel_get_process_attr_tracker(
1773 session
->kernel_session
, process_attr
);
1775 case LTTNG_DOMAIN_UST
:
1776 if (!session
->ust_session
) {
1777 ret_code
= LTTNG_ERR_INVALID
;
1780 tracker
= trace_ust_get_process_attr_tracker(
1781 session
->ust_session
, process_attr
);
1784 ret_code
= LTTNG_ERR_UNSUPPORTED_DOMAIN
;
1789 ret_code
= LTTNG_ERR_INVALID
;
1793 status
= process_attr_tracker_get_inclusion_set(tracker
, values
);
1795 case PROCESS_ATTR_TRACKER_STATUS_OK
:
1796 ret_code
= LTTNG_OK
;
1798 case PROCESS_ATTR_TRACKER_STATUS_INVALID_TRACKING_POLICY
:
1799 ret_code
= LTTNG_ERR_PROCESS_ATTR_TRACKER_INVALID_TRACKING_POLICY
;
1801 case PROCESS_ATTR_TRACKER_STATUS_ERROR
:
1802 ret_code
= LTTNG_ERR_NOMEM
;
1805 ret_code
= LTTNG_ERR_UNK
;
1814 * Command LTTNG_DISABLE_EVENT processed by the client thread.
1816 int cmd_disable_event(struct ltt_session
*session
,
1817 enum lttng_domain_type domain
, const char *channel_name
,
1818 const struct lttng_event
*event
)
1821 const char *event_name
;
1823 DBG("Disable event command for event \'%s\'", event
->name
);
1825 event_name
= event
->name
;
1827 /* Error out on unhandled search criteria */
1828 if (event
->loglevel_type
|| event
->loglevel
!= -1 || event
->enabled
1829 || event
->pid
|| event
->filter
|| event
->exclusion
) {
1830 ret
= LTTNG_ERR_UNK
;
1837 case LTTNG_DOMAIN_KERNEL
:
1839 struct ltt_kernel_channel
*kchan
;
1840 struct ltt_kernel_session
*ksess
;
1842 ksess
= session
->kernel_session
;
1845 * If a non-default channel has been created in the
1846 * session, explicitely require that -c chan_name needs
1849 if (ksess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1850 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1854 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
1855 if (kchan
== NULL
) {
1856 ret
= LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
1860 switch (event
->type
) {
1861 case LTTNG_EVENT_ALL
:
1862 case LTTNG_EVENT_TRACEPOINT
:
1863 case LTTNG_EVENT_SYSCALL
:
1864 case LTTNG_EVENT_PROBE
:
1865 case LTTNG_EVENT_FUNCTION
:
1866 case LTTNG_EVENT_FUNCTION_ENTRY
:/* fall-through */
1867 if (event_name
[0] == '\0') {
1868 ret
= event_kernel_disable_event(kchan
,
1871 ret
= event_kernel_disable_event(kchan
,
1872 event_name
, event
->type
);
1874 if (ret
!= LTTNG_OK
) {
1879 ret
= LTTNG_ERR_UNK
;
1883 kernel_wait_quiescent();
1886 case LTTNG_DOMAIN_UST
:
1888 struct ltt_ust_channel
*uchan
;
1889 struct ltt_ust_session
*usess
;
1891 usess
= session
->ust_session
;
1893 if (validate_ust_event_name(event_name
)) {
1894 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
1899 * If a non-default channel has been created in the
1900 * session, explicitly require that -c chan_name needs
1903 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
1904 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
1908 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
1910 if (uchan
== NULL
) {
1911 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1915 switch (event
->type
) {
1916 case LTTNG_EVENT_ALL
:
1918 * An empty event name means that everything
1919 * should be disabled.
1921 if (event
->name
[0] == '\0') {
1922 ret
= event_ust_disable_all_tracepoints(usess
, uchan
);
1924 ret
= event_ust_disable_tracepoint(usess
, uchan
,
1927 if (ret
!= LTTNG_OK
) {
1932 ret
= LTTNG_ERR_UNK
;
1936 DBG3("Disable UST event %s in channel %s completed", event_name
,
1940 case LTTNG_DOMAIN_LOG4J
:
1941 case LTTNG_DOMAIN_JUL
:
1942 case LTTNG_DOMAIN_PYTHON
:
1945 struct ltt_ust_session
*usess
= session
->ust_session
;
1949 switch (event
->type
) {
1950 case LTTNG_EVENT_ALL
:
1953 ret
= LTTNG_ERR_UNK
;
1957 agt
= trace_ust_find_agent(usess
, domain
);
1959 ret
= -LTTNG_ERR_UST_EVENT_NOT_FOUND
;
1963 * An empty event name means that everything
1964 * should be disabled.
1966 if (event
->name
[0] == '\0') {
1967 ret
= event_agent_disable_all(usess
, agt
);
1969 ret
= event_agent_disable(usess
, agt
, event_name
);
1971 if (ret
!= LTTNG_OK
) {
1978 ret
= LTTNG_ERR_UND
;
1991 * Command LTTNG_ADD_CONTEXT processed by the client thread.
1993 int cmd_add_context(struct ltt_session
*session
, enum lttng_domain_type domain
,
1994 char *channel_name
, const struct lttng_event_context
*ctx
, int kwpipe
)
1996 int ret
, chan_kern_created
= 0, chan_ust_created
= 0;
1997 char *app_ctx_provider_name
= NULL
, *app_ctx_name
= NULL
;
2000 * Don't try to add a context if the session has been started at
2001 * some point in time before. The tracer does not allow it and would
2002 * result in a corrupted trace.
2004 if (session
->has_been_started
) {
2005 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2009 if (ctx
->ctx
== LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
2010 app_ctx_provider_name
= ctx
->u
.app_ctx
.provider_name
;
2011 app_ctx_name
= ctx
->u
.app_ctx
.ctx_name
;
2015 case LTTNG_DOMAIN_KERNEL
:
2016 assert(session
->kernel_session
);
2018 if (session
->kernel_session
->channel_count
== 0) {
2019 /* Create default channel */
2020 ret
= channel_kernel_create(session
->kernel_session
, NULL
, kwpipe
);
2021 if (ret
!= LTTNG_OK
) {
2024 chan_kern_created
= 1;
2026 /* Add kernel context to kernel tracer */
2027 ret
= context_kernel_add(session
->kernel_session
, ctx
, channel_name
);
2028 if (ret
!= LTTNG_OK
) {
2032 case LTTNG_DOMAIN_JUL
:
2033 case LTTNG_DOMAIN_LOG4J
:
2036 * Validate channel name.
2037 * If no channel name is given and the domain is JUL or LOG4J,
2038 * set it to the appropriate domain-specific channel name. If
2039 * a name is provided but does not match the expexted channel
2040 * name, return an error.
2042 if (domain
== LTTNG_DOMAIN_JUL
&& *channel_name
&&
2043 strcmp(channel_name
,
2044 DEFAULT_JUL_CHANNEL_NAME
)) {
2045 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2047 } else if (domain
== LTTNG_DOMAIN_LOG4J
&& *channel_name
&&
2048 strcmp(channel_name
,
2049 DEFAULT_LOG4J_CHANNEL_NAME
)) {
2050 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
2053 /* break is _not_ missing here. */
2055 case LTTNG_DOMAIN_UST
:
2057 struct ltt_ust_session
*usess
= session
->ust_session
;
2058 unsigned int chan_count
;
2062 chan_count
= lttng_ht_get_count(usess
->domain_global
.channels
);
2063 if (chan_count
== 0) {
2064 struct lttng_channel
*attr
;
2065 /* Create default channel */
2066 attr
= channel_new_default_attr(domain
, usess
->buffer_type
);
2068 ret
= LTTNG_ERR_FATAL
;
2072 ret
= channel_ust_create(usess
, attr
, usess
->buffer_type
);
2073 if (ret
!= LTTNG_OK
) {
2077 channel_attr_destroy(attr
);
2078 chan_ust_created
= 1;
2081 ret
= context_ust_add(usess
, domain
, ctx
, channel_name
);
2082 free(app_ctx_provider_name
);
2084 app_ctx_name
= NULL
;
2085 app_ctx_provider_name
= NULL
;
2086 if (ret
!= LTTNG_OK
) {
2092 ret
= LTTNG_ERR_UND
;
2100 if (chan_kern_created
) {
2101 struct ltt_kernel_channel
*kchan
=
2102 trace_kernel_get_channel_by_name(DEFAULT_CHANNEL_NAME
,
2103 session
->kernel_session
);
2104 /* Created previously, this should NOT fail. */
2106 kernel_destroy_channel(kchan
);
2109 if (chan_ust_created
) {
2110 struct ltt_ust_channel
*uchan
=
2111 trace_ust_find_channel_by_name(
2112 session
->ust_session
->domain_global
.channels
,
2113 DEFAULT_CHANNEL_NAME
);
2114 /* Created previously, this should NOT fail. */
2116 /* Remove from the channel list of the session. */
2117 trace_ust_delete_channel(session
->ust_session
->domain_global
.channels
,
2119 trace_ust_destroy_channel(uchan
);
2122 free(app_ctx_provider_name
);
2127 static inline bool name_starts_with(const char *name
, const char *prefix
)
2129 const size_t max_cmp_len
= min(strlen(prefix
), LTTNG_SYMBOL_NAME_LEN
);
2131 return !strncmp(name
, prefix
, max_cmp_len
);
2134 /* Perform userspace-specific event name validation */
2135 static int validate_ust_event_name(const char *name
)
2145 * Check name against all internal UST event component namespaces used
2148 if (name_starts_with(name
, DEFAULT_JUL_EVENT_COMPONENT
) ||
2149 name_starts_with(name
, DEFAULT_LOG4J_EVENT_COMPONENT
) ||
2150 name_starts_with(name
, DEFAULT_PYTHON_EVENT_COMPONENT
)) {
2159 * Internal version of cmd_enable_event() with a supplemental
2160 * "internal_event" flag which is used to enable internal events which should
2161 * be hidden from clients. Such events are used in the agent implementation to
2162 * enable the events through which all "agent" events are funeled.
2164 static int _cmd_enable_event(struct ltt_session
*session
,
2165 const struct lttng_domain
*domain
,
2166 char *channel_name
, struct lttng_event
*event
,
2167 char *filter_expression
,
2168 struct lttng_filter_bytecode
*filter
,
2169 struct lttng_event_exclusion
*exclusion
,
2170 int wpipe
, bool internal_event
)
2172 int ret
= 0, channel_created
= 0;
2173 struct lttng_channel
*attr
= NULL
;
2177 assert(channel_name
);
2179 /* If we have a filter, we must have its filter expression */
2180 assert(!(!!filter_expression
^ !!filter
));
2182 /* Normalize event name as a globbing pattern */
2183 strutils_normalize_star_glob_pattern(event
->name
);
2185 /* Normalize exclusion names as globbing patterns */
2189 for (i
= 0; i
< exclusion
->count
; i
++) {
2190 char *name
= LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion
, i
);
2192 strutils_normalize_star_glob_pattern(name
);
2196 DBG("Enable event command for event \'%s\'", event
->name
);
2200 switch (domain
->type
) {
2201 case LTTNG_DOMAIN_KERNEL
:
2203 struct ltt_kernel_channel
*kchan
;
2206 * If a non-default channel has been created in the
2207 * session, explicitely require that -c chan_name needs
2210 if (session
->kernel_session
->has_non_default_channel
2211 && channel_name
[0] == '\0') {
2212 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2216 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2217 session
->kernel_session
);
2218 if (kchan
== NULL
) {
2219 attr
= channel_new_default_attr(LTTNG_DOMAIN_KERNEL
,
2220 LTTNG_BUFFER_GLOBAL
);
2222 ret
= LTTNG_ERR_FATAL
;
2225 if (lttng_strncpy(attr
->name
, channel_name
,
2226 sizeof(attr
->name
))) {
2227 ret
= LTTNG_ERR_INVALID
;
2231 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2232 if (ret
!= LTTNG_OK
) {
2235 channel_created
= 1;
2238 /* Get the newly created kernel channel pointer */
2239 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2240 session
->kernel_session
);
2241 if (kchan
== NULL
) {
2242 /* This sould not happen... */
2243 ret
= LTTNG_ERR_FATAL
;
2247 switch (event
->type
) {
2248 case LTTNG_EVENT_ALL
:
2250 char *filter_expression_a
= NULL
;
2251 struct lttng_filter_bytecode
*filter_a
= NULL
;
2254 * We need to duplicate filter_expression and filter,
2255 * because ownership is passed to first enable
2258 if (filter_expression
) {
2259 filter_expression_a
= strdup(filter_expression
);
2260 if (!filter_expression_a
) {
2261 ret
= LTTNG_ERR_FATAL
;
2266 filter_a
= zmalloc(sizeof(*filter_a
) + filter
->len
);
2268 free(filter_expression_a
);
2269 ret
= LTTNG_ERR_FATAL
;
2272 memcpy(filter_a
, filter
, sizeof(*filter_a
) + filter
->len
);
2274 event
->type
= LTTNG_EVENT_TRACEPOINT
; /* Hack */
2275 ret
= event_kernel_enable_event(kchan
, event
,
2276 filter_expression
, filter
);
2277 /* We have passed ownership */
2278 filter_expression
= NULL
;
2280 if (ret
!= LTTNG_OK
) {
2281 if (channel_created
) {
2282 /* Let's not leak a useless channel. */
2283 kernel_destroy_channel(kchan
);
2285 free(filter_expression_a
);
2289 event
->type
= LTTNG_EVENT_SYSCALL
; /* Hack */
2290 ret
= event_kernel_enable_event(kchan
, event
,
2291 filter_expression_a
, filter_a
);
2292 /* We have passed ownership */
2293 filter_expression_a
= NULL
;
2295 if (ret
!= LTTNG_OK
) {
2300 case LTTNG_EVENT_PROBE
:
2301 case LTTNG_EVENT_USERSPACE_PROBE
:
2302 case LTTNG_EVENT_FUNCTION
:
2303 case LTTNG_EVENT_FUNCTION_ENTRY
:
2304 case LTTNG_EVENT_TRACEPOINT
:
2305 ret
= event_kernel_enable_event(kchan
, event
,
2306 filter_expression
, filter
);
2307 /* We have passed ownership */
2308 filter_expression
= NULL
;
2310 if (ret
!= LTTNG_OK
) {
2311 if (channel_created
) {
2312 /* Let's not leak a useless channel. */
2313 kernel_destroy_channel(kchan
);
2318 case LTTNG_EVENT_SYSCALL
:
2319 ret
= event_kernel_enable_event(kchan
, event
,
2320 filter_expression
, filter
);
2321 /* We have passed ownership */
2322 filter_expression
= NULL
;
2324 if (ret
!= LTTNG_OK
) {
2329 ret
= LTTNG_ERR_UNK
;
2333 kernel_wait_quiescent();
2336 case LTTNG_DOMAIN_UST
:
2338 struct ltt_ust_channel
*uchan
;
2339 struct ltt_ust_session
*usess
= session
->ust_session
;
2344 * If a non-default channel has been created in the
2345 * session, explicitely require that -c chan_name needs
2348 if (usess
->has_non_default_channel
&& channel_name
[0] == '\0') {
2349 ret
= LTTNG_ERR_NEED_CHANNEL_NAME
;
2353 /* Get channel from global UST domain */
2354 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2356 if (uchan
== NULL
) {
2357 /* Create default channel */
2358 attr
= channel_new_default_attr(LTTNG_DOMAIN_UST
,
2359 usess
->buffer_type
);
2361 ret
= LTTNG_ERR_FATAL
;
2364 if (lttng_strncpy(attr
->name
, channel_name
,
2365 sizeof(attr
->name
))) {
2366 ret
= LTTNG_ERR_INVALID
;
2370 ret
= cmd_enable_channel(session
, domain
, attr
, wpipe
);
2371 if (ret
!= LTTNG_OK
) {
2375 /* Get the newly created channel reference back */
2376 uchan
= trace_ust_find_channel_by_name(
2377 usess
->domain_global
.channels
, channel_name
);
2381 if (uchan
->domain
!= LTTNG_DOMAIN_UST
&& !internal_event
) {
2383 * Don't allow users to add UST events to channels which
2384 * are assigned to a userspace subdomain (JUL, Log4J,
2387 ret
= LTTNG_ERR_INVALID_CHANNEL_DOMAIN
;
2391 if (!internal_event
) {
2393 * Ensure the event name is not reserved for internal
2396 ret
= validate_ust_event_name(event
->name
);
2398 WARN("Userspace event name %s failed validation.",
2400 ret
= LTTNG_ERR_INVALID_EVENT_NAME
;
2405 /* At this point, the session and channel exist on the tracer */
2406 ret
= event_ust_enable_tracepoint(usess
, uchan
, event
,
2407 filter_expression
, filter
, exclusion
,
2409 /* We have passed ownership */
2410 filter_expression
= NULL
;
2413 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2414 goto already_enabled
;
2415 } else if (ret
!= LTTNG_OK
) {
2420 case LTTNG_DOMAIN_LOG4J
:
2421 case LTTNG_DOMAIN_JUL
:
2422 case LTTNG_DOMAIN_PYTHON
:
2424 const char *default_event_name
, *default_chan_name
;
2426 struct lttng_event uevent
;
2427 struct lttng_domain tmp_dom
;
2428 struct ltt_ust_session
*usess
= session
->ust_session
;
2432 if (!agent_tracing_is_enabled()) {
2433 DBG("Attempted to enable an event in an agent domain but the agent thread is not running");
2434 ret
= LTTNG_ERR_AGENT_TRACING_DISABLED
;
2438 agt
= trace_ust_find_agent(usess
, domain
->type
);
2440 agt
= agent_create(domain
->type
);
2442 ret
= LTTNG_ERR_NOMEM
;
2445 agent_add(agt
, usess
->agents
);
2448 /* Create the default tracepoint. */
2449 memset(&uevent
, 0, sizeof(uevent
));
2450 uevent
.type
= LTTNG_EVENT_TRACEPOINT
;
2451 uevent
.loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2452 default_event_name
= event_get_default_agent_ust_name(
2454 if (!default_event_name
) {
2455 ret
= LTTNG_ERR_FATAL
;
2458 strncpy(uevent
.name
, default_event_name
, sizeof(uevent
.name
));
2459 uevent
.name
[sizeof(uevent
.name
) - 1] = '\0';
2462 * The domain type is changed because we are about to enable the
2463 * default channel and event for the JUL domain that are hardcoded.
2464 * This happens in the UST domain.
2466 memcpy(&tmp_dom
, domain
, sizeof(tmp_dom
));
2467 tmp_dom
.type
= LTTNG_DOMAIN_UST
;
2469 switch (domain
->type
) {
2470 case LTTNG_DOMAIN_LOG4J
:
2471 default_chan_name
= DEFAULT_LOG4J_CHANNEL_NAME
;
2473 case LTTNG_DOMAIN_JUL
:
2474 default_chan_name
= DEFAULT_JUL_CHANNEL_NAME
;
2476 case LTTNG_DOMAIN_PYTHON
:
2477 default_chan_name
= DEFAULT_PYTHON_CHANNEL_NAME
;
2480 /* The switch/case we are in makes this impossible */
2485 char *filter_expression_copy
= NULL
;
2486 struct lttng_filter_bytecode
*filter_copy
= NULL
;
2489 const size_t filter_size
= sizeof(
2490 struct lttng_filter_bytecode
)
2493 filter_copy
= zmalloc(filter_size
);
2495 ret
= LTTNG_ERR_NOMEM
;
2498 memcpy(filter_copy
, filter
, filter_size
);
2500 filter_expression_copy
=
2501 strdup(filter_expression
);
2502 if (!filter_expression
) {
2503 ret
= LTTNG_ERR_NOMEM
;
2506 if (!filter_expression_copy
|| !filter_copy
) {
2507 free(filter_expression_copy
);
2513 ret
= cmd_enable_event_internal(session
, &tmp_dom
,
2514 (char *) default_chan_name
,
2515 &uevent
, filter_expression_copy
,
2516 filter_copy
, NULL
, wpipe
);
2519 if (ret
== LTTNG_ERR_UST_EVENT_ENABLED
) {
2520 goto already_enabled
;
2521 } else if (ret
!= LTTNG_OK
) {
2525 /* The wild card * means that everything should be enabled. */
2526 if (strncmp(event
->name
, "*", 1) == 0 && strlen(event
->name
) == 1) {
2527 ret
= event_agent_enable_all(usess
, agt
, event
, filter
,
2530 ret
= event_agent_enable(usess
, agt
, event
, filter
,
2534 filter_expression
= NULL
;
2535 if (ret
!= LTTNG_OK
) {
2542 ret
= LTTNG_ERR_UND
;
2550 free(filter_expression
);
2553 channel_attr_destroy(attr
);
2559 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2560 * We own filter, exclusion, and filter_expression.
2562 int cmd_enable_event(struct ltt_session
*session
,
2563 const struct lttng_domain
*domain
,
2564 char *channel_name
, struct lttng_event
*event
,
2565 char *filter_expression
,
2566 struct lttng_filter_bytecode
*filter
,
2567 struct lttng_event_exclusion
*exclusion
,
2570 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2571 filter_expression
, filter
, exclusion
, wpipe
, false);
2575 * Enable an event which is internal to LTTng. An internal should
2576 * never be made visible to clients and are immune to checks such as
2579 static int cmd_enable_event_internal(struct ltt_session
*session
,
2580 const struct lttng_domain
*domain
,
2581 char *channel_name
, struct lttng_event
*event
,
2582 char *filter_expression
,
2583 struct lttng_filter_bytecode
*filter
,
2584 struct lttng_event_exclusion
*exclusion
,
2587 return _cmd_enable_event(session
, domain
, channel_name
, event
,
2588 filter_expression
, filter
, exclusion
, wpipe
, true);
2592 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2594 ssize_t
cmd_list_tracepoints(enum lttng_domain_type domain
,
2595 struct lttng_event
**events
)
2598 ssize_t nb_events
= 0;
2601 case LTTNG_DOMAIN_KERNEL
:
2602 nb_events
= kernel_list_events(events
);
2603 if (nb_events
< 0) {
2604 ret
= LTTNG_ERR_KERN_LIST_FAIL
;
2608 case LTTNG_DOMAIN_UST
:
2609 nb_events
= ust_app_list_events(events
);
2610 if (nb_events
< 0) {
2611 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2615 case LTTNG_DOMAIN_LOG4J
:
2616 case LTTNG_DOMAIN_JUL
:
2617 case LTTNG_DOMAIN_PYTHON
:
2618 nb_events
= agent_list_events(events
, domain
);
2619 if (nb_events
< 0) {
2620 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2625 ret
= LTTNG_ERR_UND
;
2632 /* Return negative value to differentiate return code */
2637 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2639 ssize_t
cmd_list_tracepoint_fields(enum lttng_domain_type domain
,
2640 struct lttng_event_field
**fields
)
2643 ssize_t nb_fields
= 0;
2646 case LTTNG_DOMAIN_UST
:
2647 nb_fields
= ust_app_list_event_fields(fields
);
2648 if (nb_fields
< 0) {
2649 ret
= LTTNG_ERR_UST_LIST_FAIL
;
2653 case LTTNG_DOMAIN_KERNEL
:
2654 default: /* fall-through */
2655 ret
= LTTNG_ERR_UND
;
2662 /* Return negative value to differentiate return code */
2666 ssize_t
cmd_list_syscalls(struct lttng_event
**events
)
2668 return syscall_table_list(events
);
2672 * Command LTTNG_START_TRACE processed by the client thread.
2674 * Called with session mutex held.
2676 int cmd_start_trace(struct ltt_session
*session
)
2678 enum lttng_error_code ret
;
2679 unsigned long nb_chan
= 0;
2680 struct ltt_kernel_session
*ksession
;
2681 struct ltt_ust_session
*usess
;
2682 const bool session_rotated_after_last_stop
=
2683 session
->rotated_after_last_stop
;
2684 const bool session_cleared_after_last_stop
=
2685 session
->cleared_after_last_stop
;
2689 /* Ease our life a bit ;) */
2690 ksession
= session
->kernel_session
;
2691 usess
= session
->ust_session
;
2693 /* Is the session already started? */
2694 if (session
->active
) {
2695 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2696 /* Perform nothing */
2700 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
&&
2701 !session
->current_trace_chunk
) {
2703 * A rotation was launched while the session was stopped and
2704 * it has not been completed yet. It is not possible to start
2705 * the session since starting the session here would require a
2706 * rotation from "NULL" to a new trace chunk. That rotation
2707 * would overlap with the ongoing rotation, which is not
2710 WARN("Refusing to start session \"%s\" as a rotation launched after the last \"stop\" is still ongoing",
2712 ret
= LTTNG_ERR_ROTATION_PENDING
;
2717 * Starting a session without channel is useless since after that it's not
2718 * possible to enable channel thus inform the client.
2720 if (usess
&& usess
->domain_global
.channels
) {
2721 nb_chan
+= lttng_ht_get_count(usess
->domain_global
.channels
);
2724 nb_chan
+= ksession
->channel_count
;
2727 ret
= LTTNG_ERR_NO_CHANNEL
;
2731 session
->active
= 1;
2732 session
->rotated_after_last_stop
= false;
2733 session
->cleared_after_last_stop
= false;
2734 if (session
->output_traces
&& !session
->current_trace_chunk
) {
2735 if (!session
->has_been_started
) {
2736 struct lttng_trace_chunk
*trace_chunk
;
2738 DBG("Creating initial trace chunk of session \"%s\"",
2740 trace_chunk
= session_create_new_trace_chunk(
2741 session
, NULL
, NULL
, NULL
);
2743 ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
2746 assert(!session
->current_trace_chunk
);
2747 ret
= session_set_trace_chunk(session
, trace_chunk
,
2749 lttng_trace_chunk_put(trace_chunk
);
2751 ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
2755 DBG("Rotating session \"%s\" from its current \"NULL\" trace chunk to a new chunk",
2758 * Rotate existing streams into the new chunk.
2759 * This is a "quiet" rotation has no client has
2760 * explicitly requested this operation.
2762 * There is also no need to wait for the rotation
2763 * to complete as it will happen immediately. No data
2764 * was produced as the session was stopped, so the
2765 * rotation should happen on reception of the command.
2767 ret
= cmd_rotate_session(session
, NULL
, true,
2768 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
);
2769 if (ret
!= LTTNG_OK
) {
2775 /* Kernel tracing */
2776 if (ksession
!= NULL
) {
2777 DBG("Start kernel tracing session %s", session
->name
);
2778 ret
= start_kernel_session(ksession
);
2779 if (ret
!= LTTNG_OK
) {
2784 /* Flag session that trace should start automatically */
2786 int int_ret
= ust_app_start_trace_all(usess
);
2789 ret
= LTTNG_ERR_UST_START_FAIL
;
2795 * Clear the flag that indicates that a rotation was done while the
2796 * session was stopped.
2798 session
->rotated_after_last_stop
= false;
2800 if (session
->rotate_timer_period
) {
2801 int int_ret
= timer_session_rotation_schedule_timer_start(
2802 session
, session
->rotate_timer_period
);
2805 ERR("Failed to enable rotate timer");
2806 ret
= LTTNG_ERR_UNK
;
2814 if (ret
== LTTNG_OK
) {
2815 /* Flag this after a successful start. */
2816 session
->has_been_started
|= 1;
2818 session
->active
= 0;
2819 /* Restore initial state on error. */
2820 session
->rotated_after_last_stop
=
2821 session_rotated_after_last_stop
;
2822 session
->cleared_after_last_stop
=
2823 session_cleared_after_last_stop
;
2830 * Command LTTNG_STOP_TRACE processed by the client thread.
2832 int cmd_stop_trace(struct ltt_session
*session
)
2835 struct ltt_kernel_session
*ksession
;
2836 struct ltt_ust_session
*usess
;
2840 DBG("Begin stop session \"%s\" (id %" PRIu64
")", session
->name
, session
->id
);
2842 ksession
= session
->kernel_session
;
2843 usess
= session
->ust_session
;
2845 /* Session is not active. Skip everythong and inform the client. */
2846 if (!session
->active
) {
2847 ret
= LTTNG_ERR_TRACE_ALREADY_STOPPED
;
2851 ret
= stop_kernel_session(ksession
);
2852 if (ret
!= LTTNG_OK
) {
2856 if (usess
&& usess
->active
) {
2857 ret
= ust_app_stop_trace_all(usess
);
2859 ret
= LTTNG_ERR_UST_STOP_FAIL
;
2864 DBG("Completed stop session \"%s\" (id %" PRIu64
")", session
->name
,
2866 /* Flag inactive after a successful stop. */
2867 session
->active
= 0;
2875 * Set the base_path of the session only if subdir of a control uris is set.
2876 * Return LTTNG_OK on success, otherwise LTTNG_ERR_*.
2878 static int set_session_base_path_from_uris(struct ltt_session
*session
,
2880 struct lttng_uri
*uris
)
2885 for (i
= 0; i
< nb_uri
; i
++) {
2886 if (uris
[i
].stype
!= LTTNG_STREAM_CONTROL
||
2887 uris
[i
].subdir
[0] == '\0') {
2888 /* Not interested in these URIs */
2892 if (session
->base_path
!= NULL
) {
2893 free(session
->base_path
);
2894 session
->base_path
= NULL
;
2897 /* Set session base_path */
2898 session
->base_path
= strdup(uris
[i
].subdir
);
2899 if (!session
->base_path
) {
2900 PERROR("Failed to copy base path \"%s\" to session \"%s\"",
2901 uris
[i
].subdir
, session
->name
);
2902 ret
= LTTNG_ERR_NOMEM
;
2905 DBG2("Setting base path \"%s\" for session \"%s\"",
2906 session
->base_path
, session
->name
);
2914 * Command LTTNG_SET_CONSUMER_URI processed by the client thread.
2916 int cmd_set_consumer_uri(struct ltt_session
*session
, size_t nb_uri
,
2917 struct lttng_uri
*uris
)
2920 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
2921 struct ltt_ust_session
*usess
= session
->ust_session
;
2927 /* Can't set consumer URI if the session is active. */
2928 if (session
->active
) {
2929 ret
= LTTNG_ERR_TRACE_ALREADY_STARTED
;
2934 * Set the session base path if any. This is done inside
2935 * cmd_set_consumer_uri to preserve backward compatibility of the
2936 * previous session creation api vs the session descriptor api.
2938 ret
= set_session_base_path_from_uris(session
, nb_uri
, uris
);
2939 if (ret
!= LTTNG_OK
) {
2943 /* Set the "global" consumer URIs */
2944 for (i
= 0; i
< nb_uri
; i
++) {
2945 ret
= add_uri_to_consumer(session
, session
->consumer
, &uris
[i
],
2947 if (ret
!= LTTNG_OK
) {
2952 /* Set UST session URIs */
2953 if (session
->ust_session
) {
2954 for (i
= 0; i
< nb_uri
; i
++) {
2955 ret
= add_uri_to_consumer(session
,
2956 session
->ust_session
->consumer
,
2957 &uris
[i
], LTTNG_DOMAIN_UST
);
2958 if (ret
!= LTTNG_OK
) {
2964 /* Set kernel session URIs */
2965 if (session
->kernel_session
) {
2966 for (i
= 0; i
< nb_uri
; i
++) {
2967 ret
= add_uri_to_consumer(session
,
2968 session
->kernel_session
->consumer
,
2969 &uris
[i
], LTTNG_DOMAIN_KERNEL
);
2970 if (ret
!= LTTNG_OK
) {
2977 * Make sure to set the session in output mode after we set URI since a
2978 * session can be created without URL (thus flagged in no output mode).
2980 session
->output_traces
= 1;
2982 ksess
->output_traces
= 1;
2986 usess
->output_traces
= 1;
2997 enum lttng_error_code
set_session_output_from_descriptor(
2998 struct ltt_session
*session
,
2999 const struct lttng_session_descriptor
*descriptor
)
3002 enum lttng_error_code ret_code
= LTTNG_OK
;
3003 enum lttng_session_descriptor_type session_type
=
3004 lttng_session_descriptor_get_type(descriptor
);
3005 enum lttng_session_descriptor_output_type output_type
=
3006 lttng_session_descriptor_get_output_type(descriptor
);
3007 struct lttng_uri uris
[2] = {};
3008 size_t uri_count
= 0;
3010 switch (output_type
) {
3011 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NONE
:
3013 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_LOCAL
:
3014 lttng_session_descriptor_get_local_output_uri(descriptor
,
3018 case LTTNG_SESSION_DESCRIPTOR_OUTPUT_TYPE_NETWORK
:
3019 lttng_session_descriptor_get_network_output_uris(descriptor
,
3020 &uris
[0], &uris
[1]);
3024 ret_code
= LTTNG_ERR_INVALID
;
3028 switch (session_type
) {
3029 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
3031 struct snapshot_output
*new_output
= NULL
;
3033 new_output
= snapshot_output_alloc();
3035 ret_code
= LTTNG_ERR_NOMEM
;
3039 ret
= snapshot_output_init_with_uri(session
,
3040 DEFAULT_SNAPSHOT_MAX_SIZE
,
3041 NULL
, uris
, uri_count
, session
->consumer
,
3042 new_output
, &session
->snapshot
);
3044 ret_code
= (ret
== -ENOMEM
) ?
3045 LTTNG_ERR_NOMEM
: LTTNG_ERR_INVALID
;
3046 snapshot_output_destroy(new_output
);
3049 snapshot_add_output(&session
->snapshot
, new_output
);
3052 case LTTNG_SESSION_DESCRIPTOR_TYPE_REGULAR
:
3053 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
3055 ret_code
= cmd_set_consumer_uri(session
, uri_count
, uris
);
3059 ret_code
= LTTNG_ERR_INVALID
;
3067 enum lttng_error_code
cmd_create_session_from_descriptor(
3068 struct lttng_session_descriptor
*descriptor
,
3069 const lttng_sock_cred
*creds
,
3070 const char *home_path
)
3073 enum lttng_error_code ret_code
;
3074 const char *session_name
;
3075 struct ltt_session
*new_session
= NULL
;
3076 enum lttng_session_descriptor_status descriptor_status
;
3078 session_lock_list();
3080 if (*home_path
!= '/') {
3081 ERR("Home path provided by client is not absolute");
3082 ret_code
= LTTNG_ERR_INVALID
;
3087 descriptor_status
= lttng_session_descriptor_get_session_name(
3088 descriptor
, &session_name
);
3089 switch (descriptor_status
) {
3090 case LTTNG_SESSION_DESCRIPTOR_STATUS_OK
:
3092 case LTTNG_SESSION_DESCRIPTOR_STATUS_UNSET
:
3093 session_name
= NULL
;
3096 ret_code
= LTTNG_ERR_INVALID
;
3100 ret_code
= session_create(session_name
, creds
->uid
, creds
->gid
,
3102 if (ret_code
!= LTTNG_OK
) {
3106 if (!session_name
) {
3107 ret
= lttng_session_descriptor_set_session_name(descriptor
,
3110 ret_code
= LTTNG_ERR_SESSION_FAIL
;
3115 if (!lttng_session_descriptor_is_output_destination_initialized(
3118 * Only include the session's creation time in the output
3119 * destination if the name of the session itself was
3120 * not auto-generated.
3122 ret_code
= lttng_session_descriptor_set_default_output(
3124 session_name
? &new_session
->creation_time
: NULL
,
3126 if (ret_code
!= LTTNG_OK
) {
3130 new_session
->has_user_specified_directory
=
3131 lttng_session_descriptor_has_output_directory(
3135 switch (lttng_session_descriptor_get_type(descriptor
)) {
3136 case LTTNG_SESSION_DESCRIPTOR_TYPE_SNAPSHOT
:
3137 new_session
->snapshot_mode
= 1;
3139 case LTTNG_SESSION_DESCRIPTOR_TYPE_LIVE
:
3140 new_session
->live_timer
=
3141 lttng_session_descriptor_live_get_timer_interval(
3148 ret_code
= set_session_output_from_descriptor(new_session
, descriptor
);
3149 if (ret_code
!= LTTNG_OK
) {
3152 new_session
->consumer
->enabled
= 1;
3153 ret_code
= LTTNG_OK
;
3155 /* Release reference provided by the session_create function. */
3156 session_put(new_session
);
3157 if (ret_code
!= LTTNG_OK
&& new_session
) {
3158 /* Release the global reference on error. */
3159 session_destroy(new_session
);
3161 session_unlock_list();
3165 enum lttng_error_code
cmd_create_session(struct command_ctx
*cmd_ctx
, int sock
,
3166 struct lttng_session_descriptor
**return_descriptor
)
3169 size_t payload_size
;
3170 struct lttng_dynamic_buffer payload
;
3171 struct lttng_buffer_view home_dir_view
;
3172 struct lttng_buffer_view session_descriptor_view
;
3173 struct lttng_session_descriptor
*session_descriptor
= NULL
;
3174 enum lttng_error_code ret_code
;
3176 lttng_dynamic_buffer_init(&payload
);
3177 if (cmd_ctx
->lsm
->u
.create_session
.home_dir_size
>=
3179 ret_code
= LTTNG_ERR_INVALID
;
3182 if (cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
>
3183 LTTNG_SESSION_DESCRIPTOR_MAX_LEN
) {
3184 ret_code
= LTTNG_ERR_INVALID
;
3188 payload_size
= cmd_ctx
->lsm
->u
.create_session
.home_dir_size
+
3189 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
;
3190 ret
= lttng_dynamic_buffer_set_size(&payload
, payload_size
);
3192 ret_code
= LTTNG_ERR_NOMEM
;
3196 ret
= lttcomm_recv_unix_sock(sock
, payload
.data
, payload
.size
);
3198 ERR("Reception of session descriptor failed, aborting.");
3199 ret_code
= LTTNG_ERR_SESSION_FAIL
;
3203 home_dir_view
= lttng_buffer_view_from_dynamic_buffer(
3206 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
);
3207 session_descriptor_view
= lttng_buffer_view_from_dynamic_buffer(
3209 cmd_ctx
->lsm
->u
.create_session
.home_dir_size
,
3210 cmd_ctx
->lsm
->u
.create_session
.session_descriptor_size
);
3212 ret
= lttng_session_descriptor_create_from_buffer(
3213 &session_descriptor_view
, &session_descriptor
);
3215 ERR("Failed to create session descriptor from payload of \"create session\" command");
3216 ret_code
= LTTNG_ERR_INVALID
;
3221 * Sets the descriptor's auto-generated properties (name, output) if
3224 ret_code
= cmd_create_session_from_descriptor(session_descriptor
,
3226 home_dir_view
.size
? home_dir_view
.data
: NULL
);
3227 if (ret_code
!= LTTNG_OK
) {
3231 ret_code
= LTTNG_OK
;
3232 *return_descriptor
= session_descriptor
;
3233 session_descriptor
= NULL
;
3235 lttng_dynamic_buffer_reset(&payload
);
3236 lttng_session_descriptor_destroy(session_descriptor
);
3241 void cmd_destroy_session_reply(const struct ltt_session
*session
,
3242 void *_reply_context
)
3246 const struct cmd_destroy_session_reply_context
*reply_context
=
3248 struct lttng_dynamic_buffer payload
;
3249 struct lttcomm_session_destroy_command_header cmd_header
;
3250 struct lttng_trace_archive_location
*location
= NULL
;
3251 struct lttcomm_lttng_msg llm
= {
3252 .cmd_type
= LTTNG_DESTROY_SESSION
,
3253 .ret_code
= reply_context
->destruction_status
,
3256 sizeof(struct lttcomm_session_destroy_command_header
),
3259 size_t payload_size_before_location
;
3261 lttng_dynamic_buffer_init(&payload
);
3263 ret
= lttng_dynamic_buffer_append(&payload
, &llm
, sizeof(llm
));
3265 ERR("Failed to append session destruction message");
3269 cmd_header
.rotation_state
=
3270 (int32_t) (reply_context
->implicit_rotation_on_destroy
?
3271 session
->rotation_state
:
3272 LTTNG_ROTATION_STATE_NO_ROTATION
);
3273 ret
= lttng_dynamic_buffer_append(&payload
, &cmd_header
,
3274 sizeof(cmd_header
));
3276 ERR("Failed to append session destruction command header");
3280 if (!reply_context
->implicit_rotation_on_destroy
) {
3281 DBG("No implicit rotation performed during the destruction of session \"%s\", sending reply",
3285 if (session
->rotation_state
!= LTTNG_ROTATION_STATE_COMPLETED
) {
3286 DBG("Rotation state of session \"%s\" is not \"completed\", sending session destruction reply",
3291 location
= session_get_trace_archive_location(session
);
3293 ERR("Failed to get the location of the trace archive produced during the destruction of session \"%s\"",
3298 payload_size_before_location
= payload
.size
;
3299 comm_ret
= lttng_trace_archive_location_serialize(location
,
3302 ERR("Failed to serialize the location of the trace archive produced during the destruction of session \"%s\"",
3306 /* Update the message to indicate the location's length. */
3307 ((struct lttcomm_lttng_msg
*) payload
.data
)->data_size
=
3308 payload
.size
- payload_size_before_location
;
3310 comm_ret
= lttcomm_send_unix_sock(reply_context
->reply_sock_fd
,
3311 payload
.data
, payload
.size
);
3312 if (comm_ret
!= (ssize_t
) payload
.size
) {
3313 ERR("Failed to send result of the destruction of session \"%s\" to client",
3317 ret
= close(reply_context
->reply_sock_fd
);
3319 PERROR("Failed to close client socket in deferred session destroy reply");
3321 lttng_dynamic_buffer_reset(&payload
);
3322 free(_reply_context
);
3326 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3328 * Called with session lock held.
3330 int cmd_destroy_session(struct ltt_session
*session
,
3331 struct notification_thread_handle
*notification_thread_handle
,
3335 enum lttng_error_code destruction_last_error
= LTTNG_OK
;
3336 struct cmd_destroy_session_reply_context
*reply_context
= NULL
;
3339 reply_context
= zmalloc(sizeof(*reply_context
));
3340 if (!reply_context
) {
3341 ret
= LTTNG_ERR_NOMEM
;
3344 reply_context
->reply_sock_fd
= *sock_fd
;
3350 DBG("Begin destroy session %s (id %" PRIu64
")", session
->name
,
3352 if (session
->active
) {
3353 DBG("Session \"%s\" is active, attempting to stop it before destroying it",
3355 ret
= cmd_stop_trace(session
);
3356 if (ret
!= LTTNG_OK
&& ret
!= LTTNG_ERR_TRACE_ALREADY_STOPPED
) {
3357 /* Carry on with the destruction of the session. */
3358 ERR("Failed to stop session \"%s\" as part of its destruction: %s",
3359 session
->name
, lttng_strerror(-ret
));
3360 destruction_last_error
= ret
;
3364 if (session
->rotation_schedule_timer_enabled
) {
3365 if (timer_session_rotation_schedule_timer_stop(
3367 ERR("Failed to stop the \"rotation schedule\" timer of session %s",
3369 destruction_last_error
= LTTNG_ERR_TIMER_STOP_ERROR
;
3373 if (session
->rotate_size
) {
3374 unsubscribe_session_consumed_size_rotation(session
, notification_thread_handle
);
3375 session
->rotate_size
= 0;
3378 if (session
->rotated
&& session
->current_trace_chunk
&& session
->output_traces
) {
3380 * Perform a last rotation on destruction if rotations have
3381 * occurred during the session's lifetime.
3383 ret
= cmd_rotate_session(session
, NULL
, false,
3384 LTTNG_TRACE_CHUNK_COMMAND_TYPE_MOVE_TO_COMPLETED
);
3385 if (ret
!= LTTNG_OK
) {
3386 ERR("Failed to perform an implicit rotation as part of the destruction of session \"%s\": %s",
3387 session
->name
, lttng_strerror(-ret
));
3388 destruction_last_error
= -ret
;
3390 if (reply_context
) {
3391 reply_context
->implicit_rotation_on_destroy
= true;
3393 } else if (session
->has_been_started
&& session
->current_trace_chunk
) {
3395 * The user has not triggered a session rotation. However, to
3396 * ensure all data has been consumed, the session is rotated
3397 * to a 'null' trace chunk before it is destroyed.
3399 * This is a "quiet" rotation meaning that no notification is
3400 * emitted and no renaming of the current trace chunk takes
3403 ret
= cmd_rotate_session(session
, NULL
, true,
3404 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
);
3405 if (ret
!= LTTNG_OK
) {
3406 ERR("Failed to perform a quiet rotation as part of the destruction of session \"%s\": %s",
3407 session
->name
, lttng_strerror(-ret
));
3408 destruction_last_error
= -ret
;
3412 if (session
->shm_path
[0]) {
3414 * When a session is created with an explicit shm_path,
3415 * the consumer daemon will create its shared memory files
3416 * at that location and will *not* unlink them. This is normal
3417 * as the intention of that feature is to make it possible
3418 * to retrieve the content of those files should a crash occur.
3420 * To ensure the content of those files can be used, the
3421 * sessiond daemon will replicate the content of the metadata
3422 * cache in a metadata file.
3424 * On clean-up, it is expected that the consumer daemon will
3425 * unlink the shared memory files and that the session daemon
3426 * will unlink the metadata file. Then, the session's directory
3427 * in the shm path can be removed.
3429 * Unfortunately, a flaw in the design of the sessiond's and
3430 * consumerd's tear down of channels makes it impossible to
3431 * determine when the sessiond _and_ the consumerd have both
3432 * destroyed their representation of a channel. For one, the
3433 * unlinking, close, and rmdir happen in deferred 'call_rcu'
3434 * callbacks in both daemons.
3436 * However, it is also impossible for the sessiond to know when
3437 * the consumer daemon is done destroying its channel(s) since
3438 * it occurs as a reaction to the closing of the channel's file
3439 * descriptor. There is no resulting communication initiated
3440 * from the consumerd to the sessiond to confirm that the
3441 * operation is completed (and was successful).
3443 * Until this is all fixed, the session daemon checks for the
3444 * removal of the session's shm path which makes it possible
3445 * to safely advertise a session as having been destroyed.
3447 * Prior to this fix, it was not possible to reliably save
3448 * a session making use of the --shm-path option, destroy it,
3449 * and load it again. This is because the creation of the
3450 * session would fail upon seeing the session's shm path
3451 * already in existence.
3453 * Note that none of the error paths in the check for the
3454 * directory's existence return an error. This is normal
3455 * as there isn't much that can be done. The session will
3456 * be destroyed properly, except that we can't offer the
3457 * guarantee that the same session can be re-created.
3459 current_completion_handler
= &destroy_completion_handler
.handler
;
3460 ret
= lttng_strncpy(destroy_completion_handler
.shm_path
,
3462 sizeof(destroy_completion_handler
.shm_path
));
3467 * The session is destroyed. However, note that the command context
3468 * still holds a reference to the session, thus delaying its destruction
3469 * _at least_ up to the point when that reference is released.
3471 session_destroy(session
);
3472 if (reply_context
) {
3473 reply_context
->destruction_status
= destruction_last_error
;
3474 ret
= session_add_destroy_notifier(session
,
3475 cmd_destroy_session_reply
,
3476 (void *) reply_context
);
3478 ret
= LTTNG_ERR_FATAL
;
3490 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3492 int cmd_register_consumer(struct ltt_session
*session
,
3493 enum lttng_domain_type domain
, const char *sock_path
,
3494 struct consumer_data
*cdata
)
3497 struct consumer_socket
*socket
= NULL
;
3504 case LTTNG_DOMAIN_KERNEL
:
3506 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3510 /* Can't register a consumer if there is already one */
3511 if (ksess
->consumer_fds_sent
!= 0) {
3512 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3516 sock
= lttcomm_connect_unix_sock(sock_path
);
3518 ret
= LTTNG_ERR_CONNECT_FAIL
;
3521 cdata
->cmd_sock
= sock
;
3523 socket
= consumer_allocate_socket(&cdata
->cmd_sock
);
3524 if (socket
== NULL
) {
3527 PERROR("close register consumer");
3529 cdata
->cmd_sock
= -1;
3530 ret
= LTTNG_ERR_FATAL
;
3534 socket
->lock
= zmalloc(sizeof(pthread_mutex_t
));
3535 if (socket
->lock
== NULL
) {
3536 PERROR("zmalloc pthread mutex");
3537 ret
= LTTNG_ERR_FATAL
;
3540 pthread_mutex_init(socket
->lock
, NULL
);
3541 socket
->registered
= 1;
3544 consumer_add_socket(socket
, ksess
->consumer
);
3547 pthread_mutex_lock(&cdata
->pid_mutex
);
3549 pthread_mutex_unlock(&cdata
->pid_mutex
);
3554 /* TODO: Userspace tracing */
3555 ret
= LTTNG_ERR_UND
;
3563 consumer_destroy_socket(socket
);
3569 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3571 ssize_t
cmd_list_domains(struct ltt_session
*session
,
3572 struct lttng_domain
**domains
)
3577 struct lttng_ht_iter iter
;
3579 if (session
->kernel_session
!= NULL
) {
3580 DBG3("Listing domains found kernel domain");
3584 if (session
->ust_session
!= NULL
) {
3585 DBG3("Listing domains found UST global domain");
3589 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3591 if (agt
->being_used
) {
3602 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3603 if (*domains
== NULL
) {
3604 ret
= LTTNG_ERR_FATAL
;
3608 if (session
->kernel_session
!= NULL
) {
3609 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3611 /* Kernel session buffer type is always GLOBAL */
3612 (*domains
)[index
].buf_type
= LTTNG_BUFFER_GLOBAL
;
3617 if (session
->ust_session
!= NULL
) {
3618 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3619 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3623 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
, &iter
.iter
,
3625 if (agt
->being_used
) {
3626 (*domains
)[index
].type
= agt
->domain
;
3627 (*domains
)[index
].buf_type
= session
->ust_session
->buffer_type
;
3637 /* Return negative value to differentiate return code */
3643 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3645 ssize_t
cmd_list_channels(enum lttng_domain_type domain
,
3646 struct ltt_session
*session
, struct lttng_channel
**channels
)
3648 ssize_t nb_chan
= 0, payload_size
= 0, ret
;
3651 case LTTNG_DOMAIN_KERNEL
:
3652 if (session
->kernel_session
!= NULL
) {
3653 nb_chan
= session
->kernel_session
->channel_count
;
3655 DBG3("Number of kernel channels %zd", nb_chan
);
3657 ret
= -LTTNG_ERR_KERN_CHAN_NOT_FOUND
;
3661 case LTTNG_DOMAIN_UST
:
3662 if (session
->ust_session
!= NULL
) {
3664 nb_chan
= lttng_ht_get_count(
3665 session
->ust_session
->domain_global
.channels
);
3668 DBG3("Number of UST global channels %zd", nb_chan
);
3670 ret
= -LTTNG_ERR_UST_CHAN_NOT_FOUND
;
3675 ret
= -LTTNG_ERR_UND
;
3680 const size_t channel_size
= sizeof(struct lttng_channel
) +
3681 sizeof(struct lttng_channel_extended
);
3682 struct lttng_channel_extended
*channel_exts
;
3684 payload_size
= nb_chan
* channel_size
;
3685 *channels
= zmalloc(payload_size
);
3686 if (*channels
== NULL
) {
3687 ret
= -LTTNG_ERR_FATAL
;
3691 channel_exts
= ((void *) *channels
) +
3692 (nb_chan
* sizeof(struct lttng_channel
));
3693 ret
= list_lttng_channels(domain
, session
, *channels
, channel_exts
);
3694 if (ret
!= LTTNG_OK
) {
3709 * Command LTTNG_LIST_EVENTS processed by the client thread.
3711 ssize_t
cmd_list_events(enum lttng_domain_type domain
,
3712 struct ltt_session
*session
, char *channel_name
,
3713 struct lttng_event
**events
, size_t *total_size
)
3716 ssize_t nb_event
= 0;
3719 case LTTNG_DOMAIN_KERNEL
:
3720 if (session
->kernel_session
!= NULL
) {
3721 nb_event
= list_lttng_kernel_events(channel_name
,
3722 session
->kernel_session
, events
,
3726 case LTTNG_DOMAIN_UST
:
3728 if (session
->ust_session
!= NULL
) {
3729 nb_event
= list_lttng_ust_global_events(channel_name
,
3730 &session
->ust_session
->domain_global
, events
,
3735 case LTTNG_DOMAIN_LOG4J
:
3736 case LTTNG_DOMAIN_JUL
:
3737 case LTTNG_DOMAIN_PYTHON
:
3738 if (session
->ust_session
) {
3739 struct lttng_ht_iter iter
;
3743 cds_lfht_for_each_entry(session
->ust_session
->agents
->ht
,
3744 &iter
.iter
, agt
, node
.node
) {
3745 if (agt
->domain
== domain
) {
3746 nb_event
= list_lttng_agent_events(
3756 ret
= LTTNG_ERR_UND
;
3763 /* Return negative value to differentiate return code */
3768 * Using the session list, filled a lttng_session array to send back to the
3769 * client for session listing.
3771 * The session list lock MUST be acquired before calling this function. Use
3772 * session_lock_list() and session_unlock_list().
3774 void cmd_list_lttng_sessions(struct lttng_session
*sessions
,
3775 size_t session_count
, uid_t uid
, gid_t gid
)
3779 struct ltt_session
*session
;
3780 struct ltt_session_list
*list
= session_get_list();
3781 struct lttng_session_extended
*extended
=
3782 (typeof(extended
)) (&sessions
[session_count
]);
3784 DBG("Getting all available session for UID %d GID %d",
3787 * Iterate over session list and append data after the control struct in
3790 cds_list_for_each_entry(session
, &list
->head
, list
) {
3791 if (!session_get(session
)) {
3795 * Only list the sessions the user can control.
3797 if (!session_access_ok(session
, uid
, gid
) ||
3798 session
->destroyed
) {
3799 session_put(session
);
3803 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3804 struct ltt_ust_session
*usess
= session
->ust_session
;
3806 if (session
->consumer
->type
== CONSUMER_DST_NET
||
3807 (ksess
&& ksess
->consumer
->type
== CONSUMER_DST_NET
) ||
3808 (usess
&& usess
->consumer
->type
== CONSUMER_DST_NET
)) {
3809 ret
= build_network_session_path(sessions
[i
].path
,
3810 sizeof(sessions
[i
].path
), session
);
3812 ret
= snprintf(sessions
[i
].path
, sizeof(sessions
[i
].path
), "%s",
3813 session
->consumer
->dst
.session_root_path
);
3816 PERROR("snprintf session path");
3817 session_put(session
);
3821 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
3822 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
3823 sessions
[i
].enabled
= session
->active
;
3824 sessions
[i
].snapshot_mode
= session
->snapshot_mode
;
3825 sessions
[i
].live_timer_interval
= session
->live_timer
;
3826 extended
[i
].creation_time
.value
= (uint64_t) session
->creation_time
;
3827 extended
[i
].creation_time
.is_set
= 1;
3829 session_put(session
);
3834 * Command LTTNG_DATA_PENDING returning 0 if the data is NOT pending meaning
3835 * ready for trace analysis (or any kind of reader) or else 1 for pending data.
3837 int cmd_data_pending(struct ltt_session
*session
)
3840 struct ltt_kernel_session
*ksess
= session
->kernel_session
;
3841 struct ltt_ust_session
*usess
= session
->ust_session
;
3845 DBG("Data pending for session %s", session
->name
);
3847 /* Session MUST be stopped to ask for data availability. */
3848 if (session
->active
) {
3849 ret
= LTTNG_ERR_SESSION_STARTED
;
3853 * If stopped, just make sure we've started before else the above call
3854 * will always send that there is data pending.
3856 * The consumer assumes that when the data pending command is received,
3857 * the trace has been started before or else no output data is written
3858 * by the streams which is a condition for data pending. So, this is
3859 * *VERY* important that we don't ask the consumer before a start
3862 if (!session
->has_been_started
) {
3868 /* A rotation is still pending, we have to wait. */
3869 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
3870 DBG("Rotate still pending for session %s", session
->name
);
3875 if (ksess
&& ksess
->consumer
) {
3876 ret
= consumer_is_data_pending(ksess
->id
, ksess
->consumer
);
3878 /* Data is still being extracted for the kernel. */
3883 if (usess
&& usess
->consumer
) {
3884 ret
= consumer_is_data_pending(usess
->id
, usess
->consumer
);
3886 /* Data is still being extracted for the kernel. */
3891 /* Data is ready to be read by a viewer */
3899 * Command LTTNG_SNAPSHOT_ADD_OUTPUT from the lttng ctl library.
3901 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3903 int cmd_snapshot_add_output(struct ltt_session
*session
,
3904 const struct lttng_snapshot_output
*output
, uint32_t *id
)
3907 struct snapshot_output
*new_output
;
3912 DBG("Cmd snapshot add output for session %s", session
->name
);
3915 * Can't create an output if the session is not set in no-output mode.
3917 if (session
->output_traces
) {
3918 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3922 if (session
->has_non_mmap_channel
) {
3923 ret
= LTTNG_ERR_SNAPSHOT_UNSUPPORTED
;
3927 /* Only one output is allowed until we have the "tee" feature. */
3928 if (session
->snapshot
.nb_output
== 1) {
3929 ret
= LTTNG_ERR_SNAPSHOT_OUTPUT_EXIST
;
3933 new_output
= snapshot_output_alloc();
3935 ret
= LTTNG_ERR_NOMEM
;
3939 ret
= snapshot_output_init(session
, output
->max_size
, output
->name
,
3940 output
->ctrl_url
, output
->data_url
, session
->consumer
, new_output
,
3941 &session
->snapshot
);
3943 if (ret
== -ENOMEM
) {
3944 ret
= LTTNG_ERR_NOMEM
;
3946 ret
= LTTNG_ERR_INVALID
;
3952 snapshot_add_output(&session
->snapshot
, new_output
);
3954 *id
= new_output
->id
;
3961 snapshot_output_destroy(new_output
);
3967 * Command LTTNG_SNAPSHOT_DEL_OUTPUT from lib lttng ctl.
3969 * Return LTTNG_OK on success or else a LTTNG_ERR code.
3971 int cmd_snapshot_del_output(struct ltt_session
*session
,
3972 const struct lttng_snapshot_output
*output
)
3975 struct snapshot_output
*sout
= NULL
;
3983 * Permission denied to create an output if the session is not
3984 * set in no output mode.
3986 if (session
->output_traces
) {
3987 ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
3992 DBG("Cmd snapshot del output id %" PRIu32
" for session %s", output
->id
,
3994 sout
= snapshot_find_output_by_id(output
->id
, &session
->snapshot
);
3995 } else if (*output
->name
!= '\0') {
3996 DBG("Cmd snapshot del output name %s for session %s", output
->name
,
3998 sout
= snapshot_find_output_by_name(output
->name
, &session
->snapshot
);
4001 ret
= LTTNG_ERR_INVALID
;
4005 snapshot_delete_output(&session
->snapshot
, sout
);
4006 snapshot_output_destroy(sout
);
4015 * Command LTTNG_SNAPSHOT_LIST_OUTPUT from lib lttng ctl.
4017 * If no output is available, outputs is untouched and 0 is returned.
4019 * Return the size of the newly allocated outputs or a negative LTTNG_ERR code.
4021 ssize_t
cmd_snapshot_list_outputs(struct ltt_session
*session
,
4022 struct lttng_snapshot_output
**outputs
)
4025 struct lttng_snapshot_output
*list
= NULL
;
4026 struct lttng_ht_iter iter
;
4027 struct snapshot_output
*output
;
4032 DBG("Cmd snapshot list outputs for session %s", session
->name
);
4035 * Permission denied to create an output if the session is not
4036 * set in no output mode.
4038 if (session
->output_traces
) {
4039 ret
= -LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
4043 if (session
->snapshot
.nb_output
== 0) {
4048 list
= zmalloc(session
->snapshot
.nb_output
* sizeof(*list
));
4050 ret
= -LTTNG_ERR_NOMEM
;
4054 /* Copy list from session to the new list object. */
4056 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
, &iter
.iter
,
4057 output
, node
.node
) {
4058 assert(output
->consumer
);
4059 list
[idx
].id
= output
->id
;
4060 list
[idx
].max_size
= output
->max_size
;
4061 if (lttng_strncpy(list
[idx
].name
, output
->name
,
4062 sizeof(list
[idx
].name
))) {
4063 ret
= -LTTNG_ERR_INVALID
;
4066 if (output
->consumer
->type
== CONSUMER_DST_LOCAL
) {
4067 if (lttng_strncpy(list
[idx
].ctrl_url
,
4068 output
->consumer
->dst
.session_root_path
,
4069 sizeof(list
[idx
].ctrl_url
))) {
4070 ret
= -LTTNG_ERR_INVALID
;
4075 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.control
,
4076 list
[idx
].ctrl_url
, sizeof(list
[idx
].ctrl_url
));
4078 ret
= -LTTNG_ERR_NOMEM
;
4083 ret
= uri_to_str_url(&output
->consumer
->dst
.net
.data
,
4084 list
[idx
].data_url
, sizeof(list
[idx
].data_url
));
4086 ret
= -LTTNG_ERR_NOMEM
;
4095 ret
= session
->snapshot
.nb_output
;
4104 * Check if we can regenerate the metadata for this session.
4105 * Only kernel, UST per-uid and non-live sessions are supported.
4107 * Return 0 if the metadata can be generated, a LTTNG_ERR code otherwise.
4110 int check_regenerate_metadata_support(struct ltt_session
*session
)
4116 if (session
->live_timer
!= 0) {
4117 ret
= LTTNG_ERR_LIVE_SESSION
;
4120 if (!session
->active
) {
4121 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
4124 if (session
->ust_session
) {
4125 switch (session
->ust_session
->buffer_type
) {
4126 case LTTNG_BUFFER_PER_UID
:
4128 case LTTNG_BUFFER_PER_PID
:
4129 ret
= LTTNG_ERR_PER_PID_SESSION
;
4133 ret
= LTTNG_ERR_UNK
;
4137 if (session
->consumer
->type
== CONSUMER_DST_NET
&&
4138 session
->consumer
->relay_minor_version
< 8) {
4139 ret
= LTTNG_ERR_RELAYD_VERSION_FAIL
;
4149 int clear_metadata_file(int fd
)
4154 lseek_ret
= lseek(fd
, 0, SEEK_SET
);
4155 if (lseek_ret
< 0) {
4161 ret
= ftruncate(fd
, 0);
4163 PERROR("ftruncate");
4172 int ust_regenerate_metadata(struct ltt_ust_session
*usess
)
4175 struct buffer_reg_uid
*uid_reg
= NULL
;
4176 struct buffer_reg_session
*session_reg
= NULL
;
4179 cds_list_for_each_entry(uid_reg
, &usess
->buffer_reg_uid_list
, lnode
) {
4180 struct ust_registry_session
*registry
;
4181 struct ust_registry_channel
*chan
;
4182 struct lttng_ht_iter iter_chan
;
4184 session_reg
= uid_reg
->registry
;
4185 registry
= session_reg
->reg
.ust
;
4187 pthread_mutex_lock(®istry
->lock
);
4188 registry
->metadata_len_sent
= 0;
4189 memset(registry
->metadata
, 0, registry
->metadata_alloc_len
);
4190 registry
->metadata_len
= 0;
4191 registry
->metadata_version
++;
4192 if (registry
->metadata_fd
> 0) {
4193 /* Clear the metadata file's content. */
4194 ret
= clear_metadata_file(registry
->metadata_fd
);
4196 pthread_mutex_unlock(®istry
->lock
);
4201 ret
= ust_metadata_session_statedump(registry
, NULL
,
4202 registry
->major
, registry
->minor
);
4204 pthread_mutex_unlock(®istry
->lock
);
4205 ERR("Failed to generate session metadata (err = %d)",
4209 cds_lfht_for_each_entry(registry
->channels
->ht
, &iter_chan
.iter
,
4211 struct ust_registry_event
*event
;
4212 struct lttng_ht_iter iter_event
;
4214 ret
= ust_metadata_channel_statedump(registry
, chan
);
4216 pthread_mutex_unlock(®istry
->lock
);
4217 ERR("Failed to generate channel metadata "
4221 cds_lfht_for_each_entry(chan
->ht
->ht
, &iter_event
.iter
,
4223 ret
= ust_metadata_event_statedump(registry
,
4226 pthread_mutex_unlock(®istry
->lock
);
4227 ERR("Failed to generate event metadata "
4233 pthread_mutex_unlock(®istry
->lock
);
4242 * Command LTTNG_REGENERATE_METADATA from the lttng-ctl library.
4244 * Ask the consumer to truncate the existing metadata file(s) and
4245 * then regenerate the metadata. Live and per-pid sessions are not
4246 * supported and return an error.
4248 * Return 0 on success or else a LTTNG_ERR code.
4250 int cmd_regenerate_metadata(struct ltt_session
*session
)
4256 ret
= check_regenerate_metadata_support(session
);
4261 if (session
->kernel_session
) {
4262 ret
= kernctl_session_regenerate_metadata(
4263 session
->kernel_session
->fd
);
4265 ERR("Failed to regenerate the kernel metadata");
4270 if (session
->ust_session
) {
4271 ret
= ust_regenerate_metadata(session
->ust_session
);
4273 ERR("Failed to regenerate the UST metadata");
4277 DBG("Cmd metadata regenerate for session %s", session
->name
);
4285 * Command LTTNG_REGENERATE_STATEDUMP from the lttng-ctl library.
4287 * Ask the tracer to regenerate a new statedump.
4289 * Return 0 on success or else a LTTNG_ERR code.
4291 int cmd_regenerate_statedump(struct ltt_session
*session
)
4297 if (!session
->active
) {
4298 ret
= LTTNG_ERR_SESSION_NOT_STARTED
;
4302 if (session
->kernel_session
) {
4303 ret
= kernctl_session_regenerate_statedump(
4304 session
->kernel_session
->fd
);
4306 * Currently, the statedump in kernel can only fail if out
4310 if (ret
== -ENOMEM
) {
4311 ret
= LTTNG_ERR_REGEN_STATEDUMP_NOMEM
;
4313 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4315 ERR("Failed to regenerate the kernel statedump");
4320 if (session
->ust_session
) {
4321 ret
= ust_app_regenerate_statedump_all(session
->ust_session
);
4323 * Currently, the statedump in UST always returns 0.
4326 ret
= LTTNG_ERR_REGEN_STATEDUMP_FAIL
;
4327 ERR("Failed to regenerate the UST statedump");
4331 DBG("Cmd regenerate statedump for session %s", session
->name
);
4338 int cmd_register_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4339 struct notification_thread_handle
*notification_thread
)
4343 ssize_t sock_recv_len
;
4344 struct lttng_trigger
*trigger
= NULL
;
4345 struct lttng_buffer_view view
;
4346 struct lttng_dynamic_buffer trigger_buffer
;
4348 lttng_dynamic_buffer_init(&trigger_buffer
);
4349 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4350 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4352 ret
= LTTNG_ERR_NOMEM
;
4356 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4358 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4359 ERR("Failed to receive \"register trigger\" command payload");
4360 /* TODO: should this be a new error enum ? */
4361 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4365 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4366 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4368 ERR("Invalid trigger payload received in \"register trigger\" command");
4369 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4373 ret
= notification_thread_command_register_trigger(notification_thread
,
4375 /* Ownership of trigger was transferred. */
4378 lttng_trigger_destroy(trigger
);
4379 lttng_dynamic_buffer_reset(&trigger_buffer
);
4383 int cmd_unregister_trigger(struct command_ctx
*cmd_ctx
, int sock
,
4384 struct notification_thread_handle
*notification_thread
)
4388 ssize_t sock_recv_len
;
4389 struct lttng_trigger
*trigger
= NULL
;
4390 struct lttng_buffer_view view
;
4391 struct lttng_dynamic_buffer trigger_buffer
;
4393 lttng_dynamic_buffer_init(&trigger_buffer
);
4394 trigger_len
= (size_t) cmd_ctx
->lsm
->u
.trigger
.length
;
4395 ret
= lttng_dynamic_buffer_set_size(&trigger_buffer
, trigger_len
);
4397 ret
= LTTNG_ERR_NOMEM
;
4401 sock_recv_len
= lttcomm_recv_unix_sock(sock
, trigger_buffer
.data
,
4403 if (sock_recv_len
< 0 || sock_recv_len
!= trigger_len
) {
4404 ERR("Failed to receive \"unregister trigger\" command payload");
4405 /* TODO: should this be a new error enum ? */
4406 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4410 view
= lttng_buffer_view_from_dynamic_buffer(&trigger_buffer
, 0, -1);
4411 if (lttng_trigger_create_from_buffer(&view
, &trigger
) !=
4413 ERR("Invalid trigger payload received in \"unregister trigger\" command");
4414 ret
= LTTNG_ERR_INVALID_TRIGGER
;
4418 ret
= notification_thread_command_unregister_trigger(notification_thread
,
4421 lttng_trigger_destroy(trigger
);
4422 lttng_dynamic_buffer_reset(&trigger_buffer
);
4427 * Send relayd sockets from snapshot output to consumer. Ignore request if the
4428 * snapshot output is *not* set with a remote destination.
4430 * Return LTTNG_OK on success or a LTTNG_ERR code.
4432 static enum lttng_error_code
set_relayd_for_snapshot(
4433 struct consumer_output
*output
,
4434 const struct ltt_session
*session
)
4436 enum lttng_error_code status
= LTTNG_OK
;
4437 struct lttng_ht_iter iter
;
4438 struct consumer_socket
*socket
;
4439 LTTNG_OPTIONAL(uint64_t) current_chunk_id
= {};
4440 const char *base_path
;
4445 DBG2("Set relayd object from snapshot output");
4447 if (session
->current_trace_chunk
) {
4448 enum lttng_trace_chunk_status chunk_status
=
4449 lttng_trace_chunk_get_id(
4450 session
->current_trace_chunk
,
4451 ¤t_chunk_id
.value
);
4453 if (chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
) {
4454 current_chunk_id
.is_set
= true;
4456 ERR("Failed to get current trace chunk id");
4457 status
= LTTNG_ERR_UNK
;
4462 /* Ignore if snapshot consumer output is not network. */
4463 if (output
->type
!= CONSUMER_DST_NET
) {
4468 * The snapshot record URI base path overrides the session
4471 if (output
->dst
.net
.control
.subdir
[0] != '\0') {
4472 base_path
= output
->dst
.net
.control
.subdir
;
4474 base_path
= session
->base_path
;
4478 * For each consumer socket, create and send the relayd object of the
4482 cds_lfht_for_each_entry(output
->socks
->ht
, &iter
.iter
,
4483 socket
, node
.node
) {
4484 pthread_mutex_lock(socket
->lock
);
4485 status
= send_consumer_relayd_sockets(0, session
->id
,
4487 session
->name
, session
->hostname
,
4489 session
->live_timer
,
4490 current_chunk_id
.is_set
? ¤t_chunk_id
.value
: NULL
,
4491 session
->creation_time
,
4492 session
->name_contains_creation_time
);
4493 pthread_mutex_unlock(socket
->lock
);
4494 if (status
!= LTTNG_OK
) {
4506 * Record a kernel snapshot.
4508 * Return LTTNG_OK on success or a LTTNG_ERR code.
4510 static enum lttng_error_code
record_kernel_snapshot(
4511 struct ltt_kernel_session
*ksess
,
4512 const struct consumer_output
*output
,
4513 const struct ltt_session
*session
,
4514 int wait
, uint64_t nb_packets_per_stream
)
4516 enum lttng_error_code status
;
4522 status
= kernel_snapshot_record(
4523 ksess
, output
, wait
, nb_packets_per_stream
);
4528 * Record a UST snapshot.
4530 * Returns LTTNG_OK on success or a LTTNG_ERR error code.
4532 static enum lttng_error_code
record_ust_snapshot(struct ltt_ust_session
*usess
,
4533 const struct consumer_output
*output
,
4534 const struct ltt_session
*session
,
4535 int wait
, uint64_t nb_packets_per_stream
)
4537 enum lttng_error_code status
;
4543 status
= ust_app_snapshot_record(
4544 usess
, output
, wait
, nb_packets_per_stream
);
4549 uint64_t get_session_size_one_more_packet_per_stream(
4550 const struct ltt_session
*session
, uint64_t cur_nr_packets
)
4552 uint64_t tot_size
= 0;
4554 if (session
->kernel_session
) {
4555 struct ltt_kernel_channel
*chan
;
4556 const struct ltt_kernel_session
*ksess
=
4557 session
->kernel_session
;
4559 cds_list_for_each_entry(chan
, &ksess
->channel_list
.head
, list
) {
4560 if (cur_nr_packets
>= chan
->channel
->attr
.num_subbuf
) {
4562 * Don't take channel into account if we
4563 * already grab all its packets.
4567 tot_size
+= chan
->channel
->attr
.subbuf_size
4568 * chan
->stream_count
;
4572 if (session
->ust_session
) {
4573 const struct ltt_ust_session
*usess
= session
->ust_session
;
4575 tot_size
+= ust_app_get_size_one_more_packet_per_stream(usess
,
4583 * Calculate the number of packets we can grab from each stream that
4584 * fits within the overall snapshot max size.
4586 * Returns -1 on error, 0 means infinite number of packets, else > 0 is
4587 * the number of packets per stream.
4589 * TODO: this approach is not perfect: we consider the worse case
4590 * (packet filling the sub-buffers) as an upper bound, but we could do
4591 * better if we do this calculation while we actually grab the packet
4592 * content: we would know how much padding we don't actually store into
4595 * This algorithm is currently bounded by the number of packets per
4598 * Since we call this algorithm before actually grabbing the data, it's
4599 * an approximation: for instance, applications could appear/disappear
4600 * in between this call and actually grabbing data.
4603 int64_t get_session_nb_packets_per_stream(const struct ltt_session
*session
,
4607 uint64_t cur_nb_packets
= 0;
4610 return 0; /* Infinite */
4613 size_left
= max_size
;
4615 uint64_t one_more_packet_tot_size
;
4617 one_more_packet_tot_size
= get_session_size_one_more_packet_per_stream(
4618 session
, cur_nb_packets
);
4619 if (!one_more_packet_tot_size
) {
4620 /* We are already grabbing all packets. */
4623 size_left
-= one_more_packet_tot_size
;
4624 if (size_left
< 0) {
4629 if (!cur_nb_packets
&& size_left
!= max_size
) {
4630 /* Not enough room to grab one packet of each stream, error. */
4633 return cur_nb_packets
;
4637 enum lttng_error_code
snapshot_record(struct ltt_session
*session
,
4638 const struct snapshot_output
*snapshot_output
, int wait
)
4640 int64_t nb_packets_per_stream
;
4641 char snapshot_chunk_name
[LTTNG_NAME_MAX
];
4643 enum lttng_error_code ret_code
= LTTNG_OK
;
4644 struct lttng_trace_chunk
*snapshot_trace_chunk
;
4645 struct consumer_output
*original_ust_consumer_output
= NULL
;
4646 struct consumer_output
*original_kernel_consumer_output
= NULL
;
4647 struct consumer_output
*snapshot_ust_consumer_output
= NULL
;
4648 struct consumer_output
*snapshot_kernel_consumer_output
= NULL
;
4650 ret
= snprintf(snapshot_chunk_name
, sizeof(snapshot_chunk_name
),
4652 snapshot_output
->name
,
4653 snapshot_output
->datetime
,
4654 snapshot_output
->nb_snapshot
);
4655 if (ret
< 0 || ret
>= sizeof(snapshot_chunk_name
)) {
4656 ERR("Failed to format snapshot name");
4657 ret_code
= LTTNG_ERR_INVALID
;
4660 DBG("Recording snapshot \"%s\" for session \"%s\" with chunk name \"%s\"",
4661 snapshot_output
->name
, session
->name
,
4662 snapshot_chunk_name
);
4663 if (!session
->kernel_session
&& !session
->ust_session
) {
4664 ERR("Failed to record snapshot as no channels exist");
4665 ret_code
= LTTNG_ERR_NO_CHANNEL
;
4669 if (session
->kernel_session
) {
4670 original_kernel_consumer_output
=
4671 session
->kernel_session
->consumer
;
4672 snapshot_kernel_consumer_output
=
4673 consumer_copy_output(snapshot_output
->consumer
);
4674 strcpy(snapshot_kernel_consumer_output
->chunk_path
,
4675 snapshot_chunk_name
);
4676 ret
= consumer_copy_sockets(snapshot_kernel_consumer_output
,
4677 original_kernel_consumer_output
);
4679 ERR("Failed to copy consumer sockets from snapshot output configuration");
4680 ret_code
= LTTNG_ERR_NOMEM
;
4683 ret_code
= set_relayd_for_snapshot(
4684 snapshot_kernel_consumer_output
, session
);
4685 if (ret_code
!= LTTNG_OK
) {
4686 ERR("Failed to setup relay daemon for kernel tracer snapshot");
4689 session
->kernel_session
->consumer
=
4690 snapshot_kernel_consumer_output
;
4692 if (session
->ust_session
) {
4693 original_ust_consumer_output
= session
->ust_session
->consumer
;
4694 snapshot_ust_consumer_output
=
4695 consumer_copy_output(snapshot_output
->consumer
);
4696 strcpy(snapshot_ust_consumer_output
->chunk_path
,
4697 snapshot_chunk_name
);
4698 ret
= consumer_copy_sockets(snapshot_ust_consumer_output
,
4699 original_ust_consumer_output
);
4701 ERR("Failed to copy consumer sockets from snapshot output configuration");
4702 ret_code
= LTTNG_ERR_NOMEM
;
4705 ret_code
= set_relayd_for_snapshot(
4706 snapshot_ust_consumer_output
, session
);
4707 if (ret_code
!= LTTNG_OK
) {
4708 ERR("Failed to setup relay daemon for userspace tracer snapshot");
4711 session
->ust_session
->consumer
=
4712 snapshot_ust_consumer_output
;
4715 snapshot_trace_chunk
= session_create_new_trace_chunk(session
,
4716 snapshot_kernel_consumer_output
?:
4717 snapshot_ust_consumer_output
,
4718 consumer_output_get_base_path(
4719 snapshot_output
->consumer
),
4720 snapshot_chunk_name
);
4721 if (!snapshot_trace_chunk
) {
4722 ERR("Failed to create temporary trace chunk to record a snapshot of session \"%s\"",
4724 ret_code
= LTTNG_ERR_CREATE_DIR_FAIL
;
4727 assert(!session
->current_trace_chunk
);
4728 ret
= session_set_trace_chunk(session
, snapshot_trace_chunk
, NULL
);
4729 lttng_trace_chunk_put(snapshot_trace_chunk
);
4730 snapshot_trace_chunk
= NULL
;
4732 ERR("Failed to set temporary trace chunk to record a snapshot of session \"%s\"",
4734 ret_code
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
4738 nb_packets_per_stream
= get_session_nb_packets_per_stream(session
,
4739 snapshot_output
->max_size
);
4740 if (nb_packets_per_stream
< 0) {
4741 ret_code
= LTTNG_ERR_MAX_SIZE_INVALID
;
4742 goto error_close_trace_chunk
;
4745 if (session
->kernel_session
) {
4746 ret_code
= record_kernel_snapshot(session
->kernel_session
,
4747 snapshot_kernel_consumer_output
, session
,
4748 wait
, nb_packets_per_stream
);
4749 if (ret_code
!= LTTNG_OK
) {
4750 goto error_close_trace_chunk
;
4754 if (session
->ust_session
) {
4755 ret_code
= record_ust_snapshot(session
->ust_session
,
4756 snapshot_ust_consumer_output
, session
,
4757 wait
, nb_packets_per_stream
);
4758 if (ret_code
!= LTTNG_OK
) {
4759 goto error_close_trace_chunk
;
4763 error_close_trace_chunk
:
4764 if (session_set_trace_chunk(session
, NULL
, &snapshot_trace_chunk
)) {
4765 ERR("Failed to release the current trace chunk of session \"%s\"",
4767 ret_code
= LTTNG_ERR_UNK
;
4770 if (session_close_trace_chunk(session
, snapshot_trace_chunk
,
4771 LTTNG_TRACE_CHUNK_COMMAND_TYPE_NO_OPERATION
, NULL
)) {
4773 * Don't goto end; make sure the chunk is closed for the session
4774 * to allow future snapshots.
4776 ERR("Failed to close snapshot trace chunk of session \"%s\"",
4778 ret_code
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
4781 if (original_ust_consumer_output
) {
4782 session
->ust_session
->consumer
= original_ust_consumer_output
;
4784 if (original_kernel_consumer_output
) {
4785 session
->kernel_session
->consumer
=
4786 original_kernel_consumer_output
;
4788 consumer_output_put(snapshot_ust_consumer_output
);
4789 consumer_output_put(snapshot_kernel_consumer_output
);
4794 * Command LTTNG_SNAPSHOT_RECORD from lib lttng ctl.
4796 * The wait parameter is ignored so this call always wait for the snapshot to
4797 * complete before returning.
4799 * Return LTTNG_OK on success or else a LTTNG_ERR code.
4801 int cmd_snapshot_record(struct ltt_session
*session
,
4802 const struct lttng_snapshot_output
*output
, int wait
)
4804 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4806 unsigned int snapshot_success
= 0;
4808 struct snapshot_output
*tmp_output
= NULL
;
4813 DBG("Cmd snapshot record for session %s", session
->name
);
4815 /* Get the datetime for the snapshot output directory. */
4816 ret
= utils_get_current_time_str("%Y%m%d-%H%M%S", datetime
,
4819 cmd_ret
= LTTNG_ERR_INVALID
;
4824 * Permission denied to create an output if the session is not
4825 * set in no output mode.
4827 if (session
->output_traces
) {
4828 cmd_ret
= LTTNG_ERR_NOT_SNAPSHOT_SESSION
;
4832 /* The session needs to be started at least once. */
4833 if (!session
->has_been_started
) {
4834 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4838 /* Use temporary output for the session. */
4839 if (*output
->ctrl_url
!= '\0') {
4840 tmp_output
= snapshot_output_alloc();
4842 cmd_ret
= LTTNG_ERR_NOMEM
;
4846 ret
= snapshot_output_init(session
, output
->max_size
,
4848 output
->ctrl_url
, output
->data_url
,
4852 if (ret
== -ENOMEM
) {
4853 cmd_ret
= LTTNG_ERR_NOMEM
;
4855 cmd_ret
= LTTNG_ERR_INVALID
;
4859 /* Use the global session count for the temporary snapshot. */
4860 tmp_output
->nb_snapshot
= session
->snapshot
.nb_snapshot
;
4862 /* Use the global datetime */
4863 memcpy(tmp_output
->datetime
, datetime
, sizeof(datetime
));
4864 cmd_ret
= snapshot_record(session
, tmp_output
, wait
);
4865 if (cmd_ret
!= LTTNG_OK
) {
4868 snapshot_success
= 1;
4870 struct snapshot_output
*sout
;
4871 struct lttng_ht_iter iter
;
4874 cds_lfht_for_each_entry(session
->snapshot
.output_ht
->ht
,
4875 &iter
.iter
, sout
, node
.node
) {
4876 struct snapshot_output output_copy
;
4879 * Make a local copy of the output and override output
4880 * parameters with those provided as part of the
4883 memcpy(&output_copy
, sout
, sizeof(output_copy
));
4885 if (output
->max_size
!= (uint64_t) -1ULL) {
4886 output_copy
.max_size
= output
->max_size
;
4889 output_copy
.nb_snapshot
= session
->snapshot
.nb_snapshot
;
4890 memcpy(output_copy
.datetime
, datetime
,
4893 /* Use temporary name. */
4894 if (*output
->name
!= '\0') {
4895 if (lttng_strncpy(output_copy
.name
,
4897 sizeof(output_copy
.name
))) {
4898 cmd_ret
= LTTNG_ERR_INVALID
;
4904 cmd_ret
= snapshot_record(session
, &output_copy
, wait
);
4905 if (cmd_ret
!= LTTNG_OK
) {
4909 snapshot_success
= 1;
4914 if (snapshot_success
) {
4915 session
->snapshot
.nb_snapshot
++;
4917 cmd_ret
= LTTNG_ERR_SNAPSHOT_FAIL
;
4922 snapshot_output_destroy(tmp_output
);
4928 * Command LTTNG_SET_SESSION_SHM_PATH processed by the client thread.
4930 int cmd_set_session_shm_path(struct ltt_session
*session
,
4931 const char *shm_path
)
4937 * Can only set shm path before session is started.
4939 if (session
->has_been_started
) {
4940 return LTTNG_ERR_SESSION_STARTED
;
4943 strncpy(session
->shm_path
, shm_path
,
4944 sizeof(session
->shm_path
));
4945 session
->shm_path
[sizeof(session
->shm_path
) - 1] = '\0';
4951 * Command LTTNG_ROTATE_SESSION from the lttng-ctl library.
4953 * Ask the consumer to rotate the session output directory.
4954 * The session lock must be held.
4956 * Returns LTTNG_OK on success or else a negative LTTng error code.
4958 int cmd_rotate_session(struct ltt_session
*session
,
4959 struct lttng_rotate_session_return
*rotate_return
,
4960 bool quiet_rotation
,
4961 enum lttng_trace_chunk_command_type command
)
4964 uint64_t ongoing_rotation_chunk_id
;
4965 enum lttng_error_code cmd_ret
= LTTNG_OK
;
4966 struct lttng_trace_chunk
*chunk_being_archived
= NULL
;
4967 struct lttng_trace_chunk
*new_trace_chunk
= NULL
;
4968 enum lttng_trace_chunk_status chunk_status
;
4969 bool failed_to_rotate
= false;
4970 enum lttng_error_code rotation_fail_code
= LTTNG_OK
;
4974 if (!session
->has_been_started
) {
4975 cmd_ret
= LTTNG_ERR_START_SESSION_ONCE
;
4980 * Explicit rotation is not supported for live sessions.
4981 * However, live sessions can perform a quiet rotation on
4983 * Rotation is not supported for snapshot traces (no output).
4985 if ((!quiet_rotation
&& session
->live_timer
) ||
4986 !session
->output_traces
) {
4987 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
4991 /* Unsupported feature in lttng-relayd before 2.11. */
4992 if (!quiet_rotation
&& session
->consumer
->type
== CONSUMER_DST_NET
&&
4993 (session
->consumer
->relay_major_version
== 2 &&
4994 session
->consumer
->relay_minor_version
< 11)) {
4995 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE_RELAY
;
4999 /* Unsupported feature in lttng-modules before 2.8 (lack of sequence number). */
5000 if (session
->kernel_session
&& !kernel_supports_ring_buffer_packet_sequence_number()) {
5001 cmd_ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE_KERNEL
;
5005 if (session
->rotation_state
== LTTNG_ROTATION_STATE_ONGOING
) {
5006 DBG("Refusing to launch a rotation; a rotation is already in progress for session %s",
5008 cmd_ret
= LTTNG_ERR_ROTATION_PENDING
;
5013 * After a stop, we only allow one rotation to occur, the other ones are
5014 * useless until a new start.
5016 if (session
->rotated_after_last_stop
) {
5017 DBG("Session \"%s\" was already rotated after stop, refusing rotation",
5019 cmd_ret
= LTTNG_ERR_ROTATION_MULTIPLE_AFTER_STOP
;
5024 * After a stop followed by a clear, disallow following rotations a they would
5025 * generate empty chunks.
5027 if (session
->cleared_after_last_stop
) {
5028 DBG("Session \"%s\" was already cleared after stop, refusing rotation",
5030 cmd_ret
= LTTNG_ERR_ROTATION_AFTER_STOP_CLEAR
;
5034 if (session
->active
) {
5035 new_trace_chunk
= session_create_new_trace_chunk(session
, NULL
,
5037 if (!new_trace_chunk
) {
5038 cmd_ret
= LTTNG_ERR_CREATE_DIR_FAIL
;
5044 * The current trace chunk becomes the chunk being archived.
5046 * After this point, "chunk_being_archived" must absolutely
5047 * be closed on the consumer(s), otherwise it will never be
5048 * cleaned-up, which will result in a leak.
5050 ret
= session_set_trace_chunk(session
, new_trace_chunk
,
5051 &chunk_being_archived
);
5053 cmd_ret
= LTTNG_ERR_CREATE_TRACE_CHUNK_FAIL_CONSUMER
;
5057 if (session
->kernel_session
) {
5058 cmd_ret
= kernel_rotate_session(session
);
5059 if (cmd_ret
!= LTTNG_OK
) {
5060 failed_to_rotate
= true;
5061 rotation_fail_code
= cmd_ret
;
5064 if (session
->ust_session
) {
5065 cmd_ret
= ust_app_rotate_session(session
);
5066 if (cmd_ret
!= LTTNG_OK
) {
5067 failed_to_rotate
= true;
5068 rotation_fail_code
= cmd_ret
;
5072 if (!session
->active
) {
5073 session
->rotated_after_last_stop
= true;
5076 if (!chunk_being_archived
) {
5077 DBG("Rotating session \"%s\" from a \"NULL\" trace chunk to a new trace chunk, skipping completion check",
5079 if (failed_to_rotate
) {
5080 cmd_ret
= rotation_fail_code
;
5087 session
->rotation_state
= LTTNG_ROTATION_STATE_ONGOING
;
5088 chunk_status
= lttng_trace_chunk_get_id(chunk_being_archived
,
5089 &ongoing_rotation_chunk_id
);
5090 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
5092 ret
= session_close_trace_chunk(session
, chunk_being_archived
,
5093 command
, session
->last_chunk_path
);
5095 cmd_ret
= LTTNG_ERR_CLOSE_TRACE_CHUNK_FAIL_CONSUMER
;
5099 if (failed_to_rotate
) {
5100 cmd_ret
= rotation_fail_code
;
5104 session
->quiet_rotation
= quiet_rotation
;
5105 ret
= timer_session_rotation_pending_check_start(session
,
5106 DEFAULT_ROTATE_PENDING_TIMER
);
5108 cmd_ret
= LTTNG_ERR_UNK
;
5112 if (rotate_return
) {
5113 rotate_return
->rotation_id
= ongoing_rotation_chunk_id
;
5116 session
->chunk_being_archived
= chunk_being_archived
;
5117 chunk_being_archived
= NULL
;
5118 if (!quiet_rotation
) {
5119 ret
= notification_thread_command_session_rotation_ongoing(
5120 notification_thread_handle
,
5121 session
->name
, session
->uid
, session
->gid
,
5122 ongoing_rotation_chunk_id
);
5123 if (ret
!= LTTNG_OK
) {
5124 ERR("Failed to notify notification thread that a session rotation is ongoing for session %s",
5130 DBG("Cmd rotate session %s, archive_id %" PRIu64
" sent",
5131 session
->name
, ongoing_rotation_chunk_id
);
5133 lttng_trace_chunk_put(new_trace_chunk
);
5134 lttng_trace_chunk_put(chunk_being_archived
);
5135 ret
= (cmd_ret
== LTTNG_OK
) ? cmd_ret
: -((int) cmd_ret
);
5138 if (session_reset_rotation_state(session
,
5139 LTTNG_ROTATION_STATE_ERROR
)) {
5140 ERR("Failed to reset rotation state of session \"%s\"",
5147 * Command LTTNG_ROTATION_GET_INFO from the lttng-ctl library.
5149 * Check if the session has finished its rotation.
5151 * Return LTTNG_OK on success or else an LTTNG_ERR code.
5153 int cmd_rotate_get_info(struct ltt_session
*session
,
5154 struct lttng_rotation_get_info_return
*info_return
,
5155 uint64_t rotation_id
)
5157 enum lttng_error_code cmd_ret
= LTTNG_OK
;
5158 enum lttng_rotation_state rotation_state
;
5160 DBG("Cmd rotate_get_info session %s, rotation id %" PRIu64
, session
->name
,
5161 session
->most_recent_chunk_id
.value
);
5163 if (session
->chunk_being_archived
) {
5164 enum lttng_trace_chunk_status chunk_status
;
5167 chunk_status
= lttng_trace_chunk_get_id(
5168 session
->chunk_being_archived
,
5170 assert(chunk_status
== LTTNG_TRACE_CHUNK_STATUS_OK
);
5172 rotation_state
= rotation_id
== chunk_id
?
5173 LTTNG_ROTATION_STATE_ONGOING
:
5174 LTTNG_ROTATION_STATE_EXPIRED
;
5176 if (session
->last_archived_chunk_id
.is_set
&&
5177 rotation_id
!= session
->last_archived_chunk_id
.value
) {
5178 rotation_state
= LTTNG_ROTATION_STATE_EXPIRED
;
5180 rotation_state
= session
->rotation_state
;
5184 switch (rotation_state
) {
5185 case LTTNG_ROTATION_STATE_NO_ROTATION
:
5186 DBG("Reporting that no rotation has occurred within the lifetime of session \"%s\"",
5189 case LTTNG_ROTATION_STATE_EXPIRED
:
5190 DBG("Reporting that the rotation state of rotation id %" PRIu64
" of session \"%s\" has expired",
5191 rotation_id
, session
->name
);
5193 case LTTNG_ROTATION_STATE_ONGOING
:
5194 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is still pending",
5195 rotation_id
, session
->name
);
5197 case LTTNG_ROTATION_STATE_COMPLETED
:
5201 char *current_tracing_path_reply
;
5202 size_t current_tracing_path_reply_len
;
5204 DBG("Reporting that rotation id %" PRIu64
" of session \"%s\" is completed",
5205 rotation_id
, session
->name
);
5207 switch (session_get_consumer_destination_type(session
)) {
5208 case CONSUMER_DST_LOCAL
:
5209 current_tracing_path_reply
=
5210 info_return
->location
.local
.absolute_path
;
5211 current_tracing_path_reply_len
=
5212 sizeof(info_return
->location
.local
.absolute_path
);
5213 info_return
->location_type
=
5214 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL
;
5215 fmt_ret
= asprintf(&chunk_path
,
5216 "%s/" DEFAULT_ARCHIVED_TRACE_CHUNKS_DIRECTORY
"/%s",
5217 session_get_base_path(session
),
5218 session
->last_archived_chunk_name
);
5219 if (fmt_ret
== -1) {
5220 PERROR("Failed to format the path of the last archived trace chunk");
5221 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5222 cmd_ret
= LTTNG_ERR_UNK
;
5226 case CONSUMER_DST_NET
:
5228 uint16_t ctrl_port
, data_port
;
5230 current_tracing_path_reply
=
5231 info_return
->location
.relay
.relative_path
;
5232 current_tracing_path_reply_len
=
5233 sizeof(info_return
->location
.relay
.relative_path
);
5234 /* Currently the only supported relay protocol. */
5235 info_return
->location
.relay
.protocol
=
5236 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP
;
5238 fmt_ret
= lttng_strncpy(info_return
->location
.relay
.host
,
5239 session_get_net_consumer_hostname(session
),
5240 sizeof(info_return
->location
.relay
.host
));
5242 ERR("Failed to copy host name to rotate_get_info reply");
5243 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5244 cmd_ret
= LTTNG_ERR_SET_URL
;
5248 session_get_net_consumer_ports(session
, &ctrl_port
, &data_port
);
5249 info_return
->location
.relay
.ports
.control
= ctrl_port
;
5250 info_return
->location
.relay
.ports
.data
= data_port
;
5251 info_return
->location_type
=
5252 (int8_t) LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY
;
5253 chunk_path
= strdup(session
->last_chunk_path
);
5255 ERR("Failed to allocate the path of the last archived trace chunk");
5256 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5257 cmd_ret
= LTTNG_ERR_UNK
;
5266 fmt_ret
= lttng_strncpy(current_tracing_path_reply
,
5267 chunk_path
, current_tracing_path_reply_len
);
5270 ERR("Failed to copy path of the last archived trace chunk to rotate_get_info reply");
5271 info_return
->status
= LTTNG_ROTATION_STATUS_ERROR
;
5272 cmd_ret
= LTTNG_ERR_UNK
;
5278 case LTTNG_ROTATION_STATE_ERROR
:
5279 DBG("Reporting that an error occurred during rotation %" PRIu64
" of session \"%s\"",
5280 rotation_id
, session
->name
);
5288 info_return
->status
= (int32_t) rotation_state
;
5293 * Command LTTNG_ROTATION_SET_SCHEDULE from the lttng-ctl library.
5295 * Configure the automatic rotation parameters.
5296 * 'activate' to true means activate the rotation schedule type with 'new_value'.
5297 * 'activate' to false means deactivate the rotation schedule and validate that
5298 * 'new_value' has the same value as the currently active value.
5300 * Return 0 on success or else a positive LTTNG_ERR code.
5302 int cmd_rotation_set_schedule(struct ltt_session
*session
,
5303 bool activate
, enum lttng_rotation_schedule_type schedule_type
,
5305 struct notification_thread_handle
*notification_thread_handle
)
5308 uint64_t *parameter_value
;
5312 DBG("Cmd rotate set schedule session %s", session
->name
);
5314 if (session
->live_timer
|| !session
->output_traces
) {
5315 DBG("Failing ROTATION_SET_SCHEDULE command as the rotation feature is not available for this session");
5316 ret
= LTTNG_ERR_ROTATION_NOT_AVAILABLE
;
5320 switch (schedule_type
) {
5321 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5322 parameter_value
= &session
->rotate_size
;
5324 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5325 parameter_value
= &session
->rotate_timer_period
;
5326 if (new_value
>= UINT_MAX
) {
5327 DBG("Failing ROTATION_SET_SCHEDULE command as the value requested for a periodic rotation schedule is invalid: %" PRIu64
" > %u (UINT_MAX)",
5328 new_value
, UINT_MAX
);
5329 ret
= LTTNG_ERR_INVALID
;
5334 WARN("Failing ROTATION_SET_SCHEDULE command on unknown schedule type");
5335 ret
= LTTNG_ERR_INVALID
;
5339 /* Improper use of the API. */
5340 if (new_value
== -1ULL) {
5341 WARN("Failing ROTATION_SET_SCHEDULE command as the value requested is -1");
5342 ret
= LTTNG_ERR_INVALID
;
5347 * As indicated in struct ltt_session's comments, a value of == 0 means
5348 * this schedule rotation type is not in use.
5350 * Reject the command if we were asked to activate a schedule that was
5353 if (activate
&& *parameter_value
!= 0) {
5354 DBG("Failing ROTATION_SET_SCHEDULE (activate) command as the schedule is already active");
5355 ret
= LTTNG_ERR_ROTATION_SCHEDULE_SET
;
5360 * Reject the command if we were asked to deactivate a schedule that was
5363 if (!activate
&& *parameter_value
== 0) {
5364 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as the schedule is already inactive");
5365 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5370 * Reject the command if we were asked to deactivate a schedule that
5373 if (!activate
&& *parameter_value
!= new_value
) {
5374 DBG("Failing ROTATION_SET_SCHEDULE (deactivate) command as an inexistant schedule was provided");
5375 ret
= LTTNG_ERR_ROTATION_SCHEDULE_NOT_SET
;
5379 *parameter_value
= activate
? new_value
: 0;
5381 switch (schedule_type
) {
5382 case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC
:
5383 if (activate
&& session
->active
) {
5385 * Only start the timer if the session is active,
5386 * otherwise it will be started when the session starts.
5388 ret
= timer_session_rotation_schedule_timer_start(
5389 session
, new_value
);
5391 ERR("Failed to enable session rotation timer in ROTATION_SET_SCHEDULE command");
5392 ret
= LTTNG_ERR_UNK
;
5396 ret
= timer_session_rotation_schedule_timer_stop(
5399 ERR("Failed to disable session rotation timer in ROTATION_SET_SCHEDULE command");
5400 ret
= LTTNG_ERR_UNK
;
5405 case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD
:
5407 ret
= subscribe_session_consumed_size_rotation(session
,
5408 new_value
, notification_thread_handle
);
5410 ERR("Failed to enable consumed-size notification in ROTATION_SET_SCHEDULE command");
5411 ret
= LTTNG_ERR_UNK
;
5415 ret
= unsubscribe_session_consumed_size_rotation(session
,
5416 notification_thread_handle
);
5418 ERR("Failed to disable consumed-size notification in ROTATION_SET_SCHEDULE command");
5419 ret
= LTTNG_ERR_UNK
;
5426 /* Would have been caught before. */
5438 /* Wait for a given path to be removed before continuing. */
5439 static enum lttng_error_code
wait_on_path(void *path_data
)
5441 const char *shm_path
= path_data
;
5443 DBG("Waiting for the shm path at %s to be removed before completing session destruction",
5449 ret
= stat(shm_path
, &st
);
5451 if (errno
!= ENOENT
) {
5452 PERROR("stat() returned an error while checking for the existence of the shm path");
5454 DBG("shm path no longer exists, completing the destruction of session");
5458 if (!S_ISDIR(st
.st_mode
)) {
5459 ERR("The type of shm path %s returned by stat() is not a directory; aborting the wait for shm path removal",
5464 usleep(SESSION_DESTROY_SHM_PATH_CHECK_DELAY_US
);
5470 * Returns a pointer to a handler to run on completion of a command.
5471 * Returns NULL if no handler has to be run for the last command executed.
5473 const struct cmd_completion_handler
*cmd_pop_completion_handler(void)
5475 struct cmd_completion_handler
*handler
= current_completion_handler
;
5477 current_completion_handler
= NULL
;
5482 * Init command subsystem.
5487 * Set network sequence index to 1 for streams to match a relayd
5488 * socket on the consumer side.
5490 pthread_mutex_lock(&relayd_net_seq_idx_lock
);
5491 relayd_net_seq_idx
= 1;
5492 pthread_mutex_unlock(&relayd_net_seq_idx_lock
);
5494 DBG("Command subsystem initialized");