2 * Copyright (C) 2011 Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2017 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * SPDX-License-Identifier: GPL-2.0-only
12 #include <lttng/ust-ctl.h>
13 #include <lttng/ust-sigbus.h>
19 #include <sys/socket.h>
21 #include <sys/types.h>
24 #include <urcu/list.h>
29 #include <bin/lttng-consumerd/health-consumerd.h>
30 #include <common/common.h>
31 #include <common/sessiond-comm/sessiond-comm.h>
32 #include <common/relayd/relayd.h>
33 #include <common/compat/fcntl.h>
34 #include <common/compat/endian.h>
35 #include <common/consumer/consumer-metadata-cache.h>
36 #include <common/consumer/consumer-stream.h>
37 #include <common/consumer/consumer-timer.h>
38 #include <common/utils.h>
39 #include <common/index/index.h>
40 #include <common/consumer/consumer.h>
41 #include <common/shm.h>
42 #include <common/optional.h>
44 #include "ust-consumer.h"
46 #define INT_MAX_STR_LEN 12 /* includes \0 */
48 extern struct lttng_consumer_global_data the_consumer_data
;
49 extern int consumer_poll_timeout
;
51 DEFINE_LTTNG_UST_SIGBUS_STATE();
54 * Free channel object and all streams associated with it. This MUST be used
55 * only and only if the channel has _NEVER_ been added to the global channel
58 static void destroy_channel(struct lttng_consumer_channel
*channel
)
60 struct lttng_consumer_stream
*stream
, *stmp
;
64 DBG("UST consumer cleaning stream list");
66 cds_list_for_each_entry_safe(stream
, stmp
, &channel
->streams
.head
,
71 cds_list_del(&stream
->send_node
);
72 lttng_ust_ctl_destroy_stream(stream
->ustream
);
73 lttng_trace_chunk_put(stream
->trace_chunk
);
78 * If a channel is available meaning that was created before the streams
82 lttng_ustconsumer_del_channel(channel
);
83 lttng_ustconsumer_free_channel(channel
);
86 if (channel
->trace_chunk
) {
87 lttng_trace_chunk_put(channel
->trace_chunk
);
94 * Add channel to internal consumer state.
96 * Returns 0 on success or else a negative value.
98 static int add_channel(struct lttng_consumer_channel
*channel
,
99 struct lttng_consumer_local_data
*ctx
)
106 if (ctx
->on_recv_channel
!= NULL
) {
107 ret
= ctx
->on_recv_channel(channel
);
109 ret
= consumer_add_channel(channel
, ctx
);
110 } else if (ret
< 0) {
111 /* Most likely an ENOMEM. */
112 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_OUTFD_ERROR
);
116 ret
= consumer_add_channel(channel
, ctx
);
119 DBG("UST consumer channel added (key: %" PRIu64
")", channel
->key
);
126 * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the
127 * error value if applicable is set in it else it is kept untouched.
129 * Return NULL on error else the newly allocated stream object.
131 static struct lttng_consumer_stream
*allocate_stream(int cpu
, int key
,
132 struct lttng_consumer_channel
*channel
,
133 struct lttng_consumer_local_data
*ctx
, int *_alloc_ret
)
136 struct lttng_consumer_stream
*stream
= NULL
;
141 stream
= consumer_stream_create(
148 channel
->trace_chunk
,
153 if (stream
== NULL
) {
157 * We could not find the channel. Can happen if cpu hotplug
158 * happens while tearing down.
160 DBG3("Could not find channel");
165 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_OUTFD_ERROR
);
171 consumer_stream_update_channel_attributes(stream
, channel
);
175 *_alloc_ret
= alloc_ret
;
181 * Send the given stream pointer to the corresponding thread.
183 * Returns 0 on success else a negative value.
185 static int send_stream_to_thread(struct lttng_consumer_stream
*stream
,
186 struct lttng_consumer_local_data
*ctx
)
189 struct lttng_pipe
*stream_pipe
;
191 /* Get the right pipe where the stream will be sent. */
192 if (stream
->metadata_flag
) {
193 consumer_add_metadata_stream(stream
);
194 stream_pipe
= ctx
->consumer_metadata_pipe
;
196 consumer_add_data_stream(stream
);
197 stream_pipe
= ctx
->consumer_data_pipe
;
201 * From this point on, the stream's ownership has been moved away from
202 * the channel and it becomes globally visible. Hence, remove it from
203 * the local stream list to prevent the stream from being both local and
206 stream
->globally_visible
= 1;
207 cds_list_del(&stream
->send_node
);
209 ret
= lttng_pipe_write(stream_pipe
, &stream
, sizeof(stream
));
211 ERR("Consumer write %s stream to pipe %d",
212 stream
->metadata_flag
? "metadata" : "data",
213 lttng_pipe_get_writefd(stream_pipe
));
214 if (stream
->metadata_flag
) {
215 consumer_del_stream_for_metadata(stream
);
217 consumer_del_stream_for_data(stream
);
227 int get_stream_shm_path(char *stream_shm_path
, const char *shm_path
, int cpu
)
229 char cpu_nr
[INT_MAX_STR_LEN
]; /* int max len */
232 strncpy(stream_shm_path
, shm_path
, PATH_MAX
);
233 stream_shm_path
[PATH_MAX
- 1] = '\0';
234 ret
= snprintf(cpu_nr
, INT_MAX_STR_LEN
, "%i", cpu
);
239 strncat(stream_shm_path
, cpu_nr
,
240 PATH_MAX
- strlen(stream_shm_path
) - 1);
247 * Create streams for the given channel using liblttng-ust-ctl.
248 * The channel lock must be acquired by the caller.
250 * Return 0 on success else a negative value.
252 static int create_ust_streams(struct lttng_consumer_channel
*channel
,
253 struct lttng_consumer_local_data
*ctx
)
256 struct lttng_ust_ctl_consumer_stream
*ustream
;
257 struct lttng_consumer_stream
*stream
;
258 pthread_mutex_t
*current_stream_lock
= NULL
;
264 * While a stream is available from ustctl. When NULL is returned, we've
265 * reached the end of the possible stream for the channel.
267 while ((ustream
= lttng_ust_ctl_create_stream(channel
->uchan
, cpu
))) {
269 int ust_metadata_pipe
[2];
271 health_code_update();
273 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
&& channel
->monitor
) {
274 ret
= utils_create_pipe_cloexec_nonblock(ust_metadata_pipe
);
276 ERR("Create ust metadata poll pipe");
279 wait_fd
= ust_metadata_pipe
[0];
281 wait_fd
= lttng_ust_ctl_stream_get_wait_fd(ustream
);
284 /* Allocate consumer stream object. */
285 stream
= allocate_stream(cpu
, wait_fd
, channel
, ctx
, &ret
);
289 stream
->ustream
= ustream
;
291 * Store it so we can save multiple function calls afterwards since
292 * this value is used heavily in the stream threads. This is UST
293 * specific so this is why it's done after allocation.
295 stream
->wait_fd
= wait_fd
;
298 * Increment channel refcount since the channel reference has now been
299 * assigned in the allocation process above.
301 if (stream
->chan
->monitor
) {
302 uatomic_inc(&stream
->chan
->refcount
);
305 pthread_mutex_lock(&stream
->lock
);
306 current_stream_lock
= &stream
->lock
;
308 * Order is important this is why a list is used. On error, the caller
309 * should clean this list.
311 cds_list_add_tail(&stream
->send_node
, &channel
->streams
.head
);
313 ret
= lttng_ust_ctl_get_max_subbuf_size(stream
->ustream
,
314 &stream
->max_sb_size
);
316 ERR("lttng_ust_ctl_get_max_subbuf_size failed for stream %s",
321 /* Do actions once stream has been received. */
322 if (ctx
->on_recv_stream
) {
323 ret
= ctx
->on_recv_stream(stream
);
329 DBG("UST consumer add stream %s (key: %" PRIu64
") with relayd id %" PRIu64
,
330 stream
->name
, stream
->key
, stream
->relayd_stream_id
);
332 /* Set next CPU stream. */
333 channel
->streams
.count
= ++cpu
;
335 /* Keep stream reference when creating metadata. */
336 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
337 channel
->metadata_stream
= stream
;
338 if (channel
->monitor
) {
339 /* Set metadata poll pipe if we created one */
340 memcpy(stream
->ust_metadata_poll_pipe
,
342 sizeof(ust_metadata_pipe
));
345 pthread_mutex_unlock(&stream
->lock
);
346 current_stream_lock
= NULL
;
353 if (current_stream_lock
) {
354 pthread_mutex_unlock(current_stream_lock
);
359 static int open_ust_stream_fd(struct lttng_consumer_channel
*channel
, int cpu
,
360 const struct lttng_credentials
*session_credentials
)
362 char shm_path
[PATH_MAX
];
365 if (!channel
->shm_path
[0]) {
366 return shm_create_anonymous("ust-consumer");
368 ret
= get_stream_shm_path(shm_path
, channel
->shm_path
, cpu
);
372 return run_as_open(shm_path
,
373 O_RDWR
| O_CREAT
| O_EXCL
, S_IRUSR
| S_IWUSR
,
374 lttng_credentials_get_uid(session_credentials
),
375 lttng_credentials_get_gid(session_credentials
));
382 * Create an UST channel with the given attributes and send it to the session
383 * daemon using the ust ctl API.
385 * Return 0 on success or else a negative value.
387 static int create_ust_channel(struct lttng_consumer_channel
*channel
,
388 struct lttng_ust_ctl_consumer_channel_attr
*attr
,
389 struct lttng_ust_ctl_consumer_channel
**ust_chanp
)
391 int ret
, nr_stream_fds
, i
, j
;
393 struct lttng_ust_ctl_consumer_channel
*ust_channel
;
398 assert(channel
->buffer_credentials
.is_set
);
400 DBG3("Creating channel to ustctl with attr: [overwrite: %d, "
401 "subbuf_size: %" PRIu64
", num_subbuf: %" PRIu64
", "
402 "switch_timer_interval: %u, read_timer_interval: %u, "
403 "output: %d, type: %d", attr
->overwrite
, attr
->subbuf_size
,
404 attr
->num_subbuf
, attr
->switch_timer_interval
,
405 attr
->read_timer_interval
, attr
->output
, attr
->type
);
407 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
)
410 nr_stream_fds
= lttng_ust_ctl_get_nr_stream_per_channel();
411 stream_fds
= zmalloc(nr_stream_fds
* sizeof(*stream_fds
));
416 for (i
= 0; i
< nr_stream_fds
; i
++) {
417 stream_fds
[i
] = open_ust_stream_fd(channel
, i
,
418 &channel
->buffer_credentials
.value
);
419 if (stream_fds
[i
] < 0) {
424 ust_channel
= lttng_ust_ctl_create_channel(attr
, stream_fds
, nr_stream_fds
);
429 channel
->nr_stream_fds
= nr_stream_fds
;
430 channel
->stream_fds
= stream_fds
;
431 *ust_chanp
= ust_channel
;
437 for (j
= i
- 1; j
>= 0; j
--) {
440 closeret
= close(stream_fds
[j
]);
444 if (channel
->shm_path
[0]) {
445 char shm_path
[PATH_MAX
];
447 closeret
= get_stream_shm_path(shm_path
,
448 channel
->shm_path
, j
);
450 ERR("Cannot get stream shm path");
452 closeret
= run_as_unlink(shm_path
,
453 lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR(
454 channel
->buffer_credentials
)),
455 lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR(
456 channel
->buffer_credentials
)));
458 PERROR("unlink %s", shm_path
);
462 /* Try to rmdir all directories under shm_path root. */
463 if (channel
->root_shm_path
[0]) {
464 (void) run_as_rmdir_recursive(channel
->root_shm_path
,
465 lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR(
466 channel
->buffer_credentials
)),
467 lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR(
468 channel
->buffer_credentials
)),
469 LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG
);
477 * Send a single given stream to the session daemon using the sock.
479 * Return 0 on success else a negative value.
481 static int send_sessiond_stream(int sock
, struct lttng_consumer_stream
*stream
)
488 DBG("UST consumer sending stream %" PRIu64
" to sessiond", stream
->key
);
490 /* Send stream to session daemon. */
491 ret
= lttng_ust_ctl_send_stream_to_sessiond(sock
, stream
->ustream
);
501 * Send channel to sessiond and relayd if applicable.
503 * Return 0 on success or else a negative value.
505 static int send_channel_to_sessiond_and_relayd(int sock
,
506 struct lttng_consumer_channel
*channel
,
507 struct lttng_consumer_local_data
*ctx
, int *relayd_error
)
509 int ret
, ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
510 struct lttng_consumer_stream
*stream
;
511 uint64_t net_seq_idx
= -1ULL;
517 DBG("UST consumer sending channel %s to sessiond", channel
->name
);
519 if (channel
->relayd_id
!= (uint64_t) -1ULL) {
520 cds_list_for_each_entry(stream
, &channel
->streams
.head
, send_node
) {
522 health_code_update();
524 /* Try to send the stream to the relayd if one is available. */
525 DBG("Sending stream %" PRIu64
" of channel \"%s\" to relayd",
526 stream
->key
, channel
->name
);
527 ret
= consumer_send_relayd_stream(stream
, stream
->chan
->pathname
);
530 * Flag that the relayd was the problem here probably due to a
531 * communicaton error on the socket.
536 ret_code
= LTTCOMM_CONSUMERD_RELAYD_FAIL
;
538 if (net_seq_idx
== -1ULL) {
539 net_seq_idx
= stream
->net_seq_idx
;
544 /* Inform sessiond that we are about to send channel and streams. */
545 ret
= consumer_send_status_msg(sock
, ret_code
);
546 if (ret
< 0 || ret_code
!= LTTCOMM_CONSUMERD_SUCCESS
) {
548 * Either the session daemon is not responding or the relayd died so we
554 /* Send channel to sessiond. */
555 ret
= lttng_ust_ctl_send_channel_to_sessiond(sock
, channel
->uchan
);
560 ret
= lttng_ust_ctl_channel_close_wakeup_fd(channel
->uchan
);
565 /* The channel was sent successfully to the sessiond at this point. */
566 cds_list_for_each_entry(stream
, &channel
->streams
.head
, send_node
) {
568 health_code_update();
570 /* Send stream to session daemon. */
571 ret
= send_sessiond_stream(sock
, stream
);
577 /* Tell sessiond there is no more stream. */
578 ret
= lttng_ust_ctl_send_stream_to_sessiond(sock
, NULL
);
583 DBG("UST consumer NULL stream sent to sessiond");
588 if (ret_code
!= LTTCOMM_CONSUMERD_SUCCESS
) {
595 * Creates a channel and streams and add the channel it to the channel internal
596 * state. The created stream must ONLY be sent once the GET_CHANNEL command is
599 * Return 0 on success or else, a negative value is returned and the channel
600 * MUST be destroyed by consumer_del_channel().
602 static int ask_channel(struct lttng_consumer_local_data
*ctx
,
603 struct lttng_consumer_channel
*channel
,
604 struct lttng_ust_ctl_consumer_channel_attr
*attr
)
613 * This value is still used by the kernel consumer since for the kernel,
614 * the stream ownership is not IN the consumer so we need to have the
615 * number of left stream that needs to be initialized so we can know when
616 * to delete the channel (see consumer.c).
618 * As for the user space tracer now, the consumer creates and sends the
619 * stream to the session daemon which only sends them to the application
620 * once every stream of a channel is received making this value useless
621 * because we they will be added to the poll thread before the application
622 * receives them. This ensures that a stream can not hang up during
623 * initilization of a channel.
625 channel
->nb_init_stream_left
= 0;
627 /* The reply msg status is handled in the following call. */
628 ret
= create_ust_channel(channel
, attr
, &channel
->uchan
);
633 channel
->wait_fd
= lttng_ust_ctl_channel_get_wait_fd(channel
->uchan
);
636 * For the snapshots (no monitor), we create the metadata streams
637 * on demand, not during the channel creation.
639 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
&& !channel
->monitor
) {
644 /* Open all streams for this channel. */
645 pthread_mutex_lock(&channel
->lock
);
646 ret
= create_ust_streams(channel
, ctx
);
647 pthread_mutex_unlock(&channel
->lock
);
657 * Send all stream of a channel to the right thread handling it.
659 * On error, return a negative value else 0 on success.
661 static int send_streams_to_thread(struct lttng_consumer_channel
*channel
,
662 struct lttng_consumer_local_data
*ctx
)
665 struct lttng_consumer_stream
*stream
, *stmp
;
670 /* Send streams to the corresponding thread. */
671 cds_list_for_each_entry_safe(stream
, stmp
, &channel
->streams
.head
,
674 health_code_update();
676 /* Sending the stream to the thread. */
677 ret
= send_stream_to_thread(stream
, ctx
);
680 * If we are unable to send the stream to the thread, there is
681 * a big problem so just stop everything.
692 * Flush channel's streams using the given key to retrieve the channel.
694 * Return 0 on success else an LTTng error code.
696 static int flush_channel(uint64_t chan_key
)
699 struct lttng_consumer_channel
*channel
;
700 struct lttng_consumer_stream
*stream
;
702 struct lttng_ht_iter iter
;
704 DBG("UST consumer flush channel key %" PRIu64
, chan_key
);
707 channel
= consumer_find_channel(chan_key
);
709 ERR("UST consumer flush channel %" PRIu64
" not found", chan_key
);
710 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
714 ht
= the_consumer_data
.stream_per_chan_id_ht
;
716 /* For each stream of the channel id, flush it. */
717 cds_lfht_for_each_entry_duplicate(ht
->ht
,
718 ht
->hash_fct(&channel
->key
, lttng_ht_seed
), ht
->match_fct
,
719 &channel
->key
, &iter
.iter
, stream
, node_channel_id
.node
) {
721 health_code_update();
723 pthread_mutex_lock(&stream
->lock
);
726 * Protect against concurrent teardown of a stream.
728 if (cds_lfht_is_node_deleted(&stream
->node
.node
)) {
732 if (!stream
->quiescent
) {
733 ret
= lttng_ust_ctl_flush_buffer(stream
->ustream
, 0);
735 ERR("Failed to flush buffer while flushing channel: channel key = %" PRIu64
", channel name = '%s'",
736 chan_key
, channel
->name
);
737 ret
= LTTNG_ERR_BUFFER_FLUSH_FAILED
;
738 pthread_mutex_unlock(&stream
->lock
);
741 stream
->quiescent
= true;
744 pthread_mutex_unlock(&stream
->lock
);
752 * Clear quiescent state from channel's streams using the given key to
753 * retrieve the channel.
755 * Return 0 on success else an LTTng error code.
757 static int clear_quiescent_channel(uint64_t chan_key
)
760 struct lttng_consumer_channel
*channel
;
761 struct lttng_consumer_stream
*stream
;
763 struct lttng_ht_iter iter
;
765 DBG("UST consumer clear quiescent channel key %" PRIu64
, chan_key
);
768 channel
= consumer_find_channel(chan_key
);
770 ERR("UST consumer clear quiescent channel %" PRIu64
" not found", chan_key
);
771 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
775 ht
= the_consumer_data
.stream_per_chan_id_ht
;
777 /* For each stream of the channel id, clear quiescent state. */
778 cds_lfht_for_each_entry_duplicate(ht
->ht
,
779 ht
->hash_fct(&channel
->key
, lttng_ht_seed
), ht
->match_fct
,
780 &channel
->key
, &iter
.iter
, stream
, node_channel_id
.node
) {
782 health_code_update();
784 pthread_mutex_lock(&stream
->lock
);
785 stream
->quiescent
= false;
786 pthread_mutex_unlock(&stream
->lock
);
794 * Close metadata stream wakeup_fd using the given key to retrieve the channel.
796 * Return 0 on success else an LTTng error code.
798 static int close_metadata(uint64_t chan_key
)
801 struct lttng_consumer_channel
*channel
;
802 unsigned int channel_monitor
;
804 DBG("UST consumer close metadata key %" PRIu64
, chan_key
);
806 channel
= consumer_find_channel(chan_key
);
809 * This is possible if the metadata thread has issue a delete because
810 * the endpoint point of the stream hung up. There is no way the
811 * session daemon can know about it thus use a DBG instead of an actual
814 DBG("UST consumer close metadata %" PRIu64
" not found", chan_key
);
815 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
819 pthread_mutex_lock(&the_consumer_data
.lock
);
820 pthread_mutex_lock(&channel
->lock
);
821 channel_monitor
= channel
->monitor
;
822 if (cds_lfht_is_node_deleted(&channel
->node
.node
)) {
826 lttng_ustconsumer_close_metadata(channel
);
827 pthread_mutex_unlock(&channel
->lock
);
828 pthread_mutex_unlock(&the_consumer_data
.lock
);
831 * The ownership of a metadata channel depends on the type of
832 * session to which it belongs. In effect, the monitor flag is checked
833 * to determine if this metadata channel is in "snapshot" mode or not.
835 * In the non-snapshot case, the metadata channel is created along with
836 * a single stream which will remain present until the metadata channel
837 * is destroyed (on the destruction of its session). In this case, the
838 * metadata stream in "monitored" by the metadata poll thread and holds
839 * the ownership of its channel.
841 * Closing the metadata will cause the metadata stream's "metadata poll
842 * pipe" to be closed. Closing this pipe will wake-up the metadata poll
843 * thread which will teardown the metadata stream which, in return,
844 * deletes the metadata channel.
846 * In the snapshot case, the metadata stream is created and destroyed
847 * on every snapshot record. Since the channel doesn't have an owner
848 * other than the session daemon, it is safe to destroy it immediately
849 * on reception of the CLOSE_METADATA command.
851 if (!channel_monitor
) {
853 * The channel and consumer_data locks must be
854 * released before this call since consumer_del_channel
855 * re-acquires the channel and consumer_data locks to teardown
856 * the channel and queue its reclamation by the "call_rcu"
859 consumer_del_channel(channel
);
864 pthread_mutex_unlock(&channel
->lock
);
865 pthread_mutex_unlock(&the_consumer_data
.lock
);
871 * RCU read side lock MUST be acquired before calling this function.
873 * Return 0 on success else an LTTng error code.
875 static int setup_metadata(struct lttng_consumer_local_data
*ctx
, uint64_t key
)
878 struct lttng_consumer_channel
*metadata
;
880 DBG("UST consumer setup metadata key %" PRIu64
, key
);
882 metadata
= consumer_find_channel(key
);
884 ERR("UST consumer push metadata %" PRIu64
" not found", key
);
885 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
890 * In no monitor mode, the metadata channel has no stream(s) so skip the
891 * ownership transfer to the metadata thread.
893 if (!metadata
->monitor
) {
894 DBG("Metadata channel in no monitor");
900 * Send metadata stream to relayd if one available. Availability is
901 * known if the stream is still in the list of the channel.
903 if (cds_list_empty(&metadata
->streams
.head
)) {
904 ERR("Metadata channel key %" PRIu64
", no stream available.", key
);
905 ret
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
906 goto error_no_stream
;
909 /* Send metadata stream to relayd if needed. */
910 if (metadata
->metadata_stream
->net_seq_idx
!= (uint64_t) -1ULL) {
911 ret
= consumer_send_relayd_stream(metadata
->metadata_stream
,
914 ret
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
917 ret
= consumer_send_relayd_streams_sent(
918 metadata
->metadata_stream
->net_seq_idx
);
920 ret
= LTTCOMM_CONSUMERD_RELAYD_FAIL
;
926 * Ownership of metadata stream is passed along. Freeing is handled by
929 ret
= send_streams_to_thread(metadata
, ctx
);
932 * If we are unable to send the stream to the thread, there is
933 * a big problem so just stop everything.
935 ret
= LTTCOMM_CONSUMERD_FATAL
;
936 goto send_streams_error
;
938 /* List MUST be empty after or else it could be reused. */
939 assert(cds_list_empty(&metadata
->streams
.head
));
946 * Delete metadata channel on error. At this point, the metadata stream can
947 * NOT be monitored by the metadata thread thus having the guarantee that
948 * the stream is still in the local stream list of the channel. This call
949 * will make sure to clean that list.
951 consumer_stream_destroy(metadata
->metadata_stream
, NULL
);
952 cds_list_del(&metadata
->metadata_stream
->send_node
);
953 metadata
->metadata_stream
= NULL
;
961 * Snapshot the whole metadata.
962 * RCU read-side lock must be held by the caller.
964 * Returns 0 on success, < 0 on error
966 static int snapshot_metadata(struct lttng_consumer_channel
*metadata_channel
,
967 uint64_t key
, char *path
, uint64_t relayd_id
,
968 struct lttng_consumer_local_data
*ctx
)
971 struct lttng_consumer_stream
*metadata_stream
;
976 DBG("UST consumer snapshot metadata with key %" PRIu64
" at path %s",
981 assert(!metadata_channel
->monitor
);
983 health_code_update();
986 * Ask the sessiond if we have new metadata waiting and update the
987 * consumer metadata cache.
989 ret
= lttng_ustconsumer_request_metadata(ctx
, metadata_channel
, 0, 1);
994 health_code_update();
997 * The metadata stream is NOT created in no monitor mode when the channel
998 * is created on a sessiond ask channel command.
1000 ret
= create_ust_streams(metadata_channel
, ctx
);
1005 metadata_stream
= metadata_channel
->metadata_stream
;
1006 assert(metadata_stream
);
1008 metadata_stream
->read_subbuffer_ops
.lock(metadata_stream
);
1009 if (relayd_id
!= (uint64_t) -1ULL) {
1010 metadata_stream
->net_seq_idx
= relayd_id
;
1011 ret
= consumer_send_relayd_stream(metadata_stream
, path
);
1013 ret
= consumer_stream_create_output_files(metadata_stream
,
1021 health_code_update();
1022 ret
= lttng_consumer_read_subbuffer(metadata_stream
, ctx
, true);
1029 metadata_stream
->read_subbuffer_ops
.unlock(metadata_stream
);
1031 * Clean up the stream completely because the next snapshot will use a
1032 * new metadata stream.
1034 consumer_stream_destroy(metadata_stream
, NULL
);
1035 cds_list_del(&metadata_stream
->send_node
);
1036 metadata_channel
->metadata_stream
= NULL
;
1044 int get_current_subbuf_addr(struct lttng_consumer_stream
*stream
,
1048 unsigned long mmap_offset
;
1049 const char *mmap_base
;
1051 mmap_base
= lttng_ust_ctl_get_mmap_base(stream
->ustream
);
1053 ERR("Failed to get mmap base for stream `%s`",
1059 ret
= lttng_ust_ctl_get_mmap_read_offset(stream
->ustream
, &mmap_offset
);
1061 ERR("Failed to get mmap offset for stream `%s`", stream
->name
);
1066 *addr
= mmap_base
+ mmap_offset
;
1073 * Take a snapshot of all the stream of a channel.
1074 * RCU read-side lock and the channel lock must be held by the caller.
1076 * Returns 0 on success, < 0 on error
1078 static int snapshot_channel(struct lttng_consumer_channel
*channel
,
1079 uint64_t key
, char *path
, uint64_t relayd_id
,
1080 uint64_t nb_packets_per_stream
,
1081 struct lttng_consumer_local_data
*ctx
)
1084 unsigned use_relayd
= 0;
1085 unsigned long consumed_pos
, produced_pos
;
1086 struct lttng_consumer_stream
*stream
;
1093 if (relayd_id
!= (uint64_t) -1ULL) {
1097 assert(!channel
->monitor
);
1098 DBG("UST consumer snapshot channel %" PRIu64
, key
);
1100 cds_list_for_each_entry(stream
, &channel
->streams
.head
, send_node
) {
1101 health_code_update();
1103 /* Lock stream because we are about to change its state. */
1104 pthread_mutex_lock(&stream
->lock
);
1105 assert(channel
->trace_chunk
);
1106 if (!lttng_trace_chunk_get(channel
->trace_chunk
)) {
1108 * Can't happen barring an internal error as the channel
1109 * holds a reference to the trace chunk.
1111 ERR("Failed to acquire reference to channel's trace chunk");
1115 assert(!stream
->trace_chunk
);
1116 stream
->trace_chunk
= channel
->trace_chunk
;
1118 stream
->net_seq_idx
= relayd_id
;
1121 ret
= consumer_send_relayd_stream(stream
, path
);
1126 ret
= consumer_stream_create_output_files(stream
,
1131 DBG("UST consumer snapshot stream (%" PRIu64
")",
1136 * If tracing is active, we want to perform a "full" buffer flush.
1137 * Else, if quiescent, it has already been done by the prior stop.
1139 if (!stream
->quiescent
) {
1140 ret
= lttng_ust_ctl_flush_buffer(stream
->ustream
, 0);
1142 ERR("Failed to flush buffer during snapshot of channel: channel key = %" PRIu64
", channel name = '%s'",
1143 channel
->key
, channel
->name
);
1148 ret
= lttng_ustconsumer_take_snapshot(stream
);
1150 ERR("Taking UST snapshot");
1154 ret
= lttng_ustconsumer_get_produced_snapshot(stream
, &produced_pos
);
1156 ERR("Produced UST snapshot position");
1160 ret
= lttng_ustconsumer_get_consumed_snapshot(stream
, &consumed_pos
);
1162 ERR("Consumerd UST snapshot position");
1167 * The original value is sent back if max stream size is larger than
1168 * the possible size of the snapshot. Also, we assume that the session
1169 * daemon should never send a maximum stream size that is lower than
1172 consumed_pos
= consumer_get_consume_start_pos(consumed_pos
,
1173 produced_pos
, nb_packets_per_stream
,
1174 stream
->max_sb_size
);
1176 while ((long) (consumed_pos
- produced_pos
) < 0) {
1178 unsigned long len
, padded_len
;
1179 const char *subbuf_addr
;
1180 struct lttng_buffer_view subbuf_view
;
1182 health_code_update();
1184 DBG("UST consumer taking snapshot at pos %lu", consumed_pos
);
1186 ret
= lttng_ust_ctl_get_subbuf(stream
->ustream
, &consumed_pos
);
1188 if (ret
!= -EAGAIN
) {
1189 PERROR("lttng_ust_ctl_get_subbuf snapshot");
1190 goto error_close_stream
;
1192 DBG("UST consumer get subbuf failed. Skipping it.");
1193 consumed_pos
+= stream
->max_sb_size
;
1194 stream
->chan
->lost_packets
++;
1198 ret
= lttng_ust_ctl_get_subbuf_size(stream
->ustream
, &len
);
1200 ERR("Snapshot lttng_ust_ctl_get_subbuf_size");
1201 goto error_put_subbuf
;
1204 ret
= lttng_ust_ctl_get_padded_subbuf_size(stream
->ustream
, &padded_len
);
1206 ERR("Snapshot lttng_ust_ctl_get_padded_subbuf_size");
1207 goto error_put_subbuf
;
1210 ret
= get_current_subbuf_addr(stream
, &subbuf_addr
);
1212 goto error_put_subbuf
;
1215 subbuf_view
= lttng_buffer_view_init(
1216 subbuf_addr
, 0, padded_len
);
1217 read_len
= lttng_consumer_on_read_subbuffer_mmap(
1218 stream
, &subbuf_view
, padded_len
- len
);
1220 if (read_len
!= len
) {
1222 goto error_put_subbuf
;
1225 if (read_len
!= padded_len
) {
1227 goto error_put_subbuf
;
1231 ret
= lttng_ust_ctl_put_subbuf(stream
->ustream
);
1233 ERR("Snapshot lttng_ust_ctl_put_subbuf");
1234 goto error_close_stream
;
1236 consumed_pos
+= stream
->max_sb_size
;
1239 /* Simply close the stream so we can use it on the next snapshot. */
1240 consumer_stream_close(stream
);
1241 pthread_mutex_unlock(&stream
->lock
);
1248 if (lttng_ust_ctl_put_subbuf(stream
->ustream
) < 0) {
1249 ERR("Snapshot lttng_ust_ctl_put_subbuf");
1252 consumer_stream_close(stream
);
1254 pthread_mutex_unlock(&stream
->lock
);
1260 void metadata_stream_reset_cache_consumed_position(
1261 struct lttng_consumer_stream
*stream
)
1263 ASSERT_LOCKED(stream
->lock
);
1265 DBG("Reset metadata cache of session %" PRIu64
,
1266 stream
->chan
->session_id
);
1267 stream
->ust_metadata_pushed
= 0;
1271 * Receive the metadata updates from the sessiond. Supports receiving
1272 * overlapping metadata, but is needs to always belong to a contiguous
1273 * range starting from 0.
1274 * Be careful about the locks held when calling this function: it needs
1275 * the metadata cache flush to concurrently progress in order to
1278 int lttng_ustconsumer_recv_metadata(int sock
, uint64_t key
, uint64_t offset
,
1279 uint64_t len
, uint64_t version
,
1280 struct lttng_consumer_channel
*channel
, int timer
, int wait
)
1282 int ret
, ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
1284 enum consumer_metadata_cache_write_status cache_write_status
;
1286 DBG("UST consumer push metadata key %" PRIu64
" of len %" PRIu64
, key
, len
);
1288 metadata_str
= zmalloc(len
* sizeof(char));
1289 if (!metadata_str
) {
1290 PERROR("zmalloc metadata string");
1291 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
1295 health_code_update();
1297 /* Receive metadata string. */
1298 ret
= lttcomm_recv_unix_sock(sock
, metadata_str
, len
);
1300 /* Session daemon is dead so return gracefully. */
1305 health_code_update();
1307 pthread_mutex_lock(&channel
->metadata_cache
->lock
);
1308 cache_write_status
= consumer_metadata_cache_write(
1309 channel
->metadata_cache
, offset
, len
, version
,
1311 pthread_mutex_unlock(&channel
->metadata_cache
->lock
);
1312 switch (cache_write_status
) {
1313 case CONSUMER_METADATA_CACHE_WRITE_STATUS_NO_CHANGE
:
1315 * The write entirely overlapped with existing contents of the
1316 * same metadata version (same content); there is nothing to do.
1319 case CONSUMER_METADATA_CACHE_WRITE_STATUS_INVALIDATED
:
1321 * The metadata cache was invalidated (previously pushed
1322 * content has been overwritten). Reset the stream's consumed
1323 * metadata position to ensure the metadata poll thread consumes
1328 * channel::metadata_stream can be null when the metadata
1329 * channel is under a snapshot session type. No need to update
1330 * the stream position in that scenario.
1332 if (channel
->metadata_stream
!= NULL
) {
1333 pthread_mutex_lock(&channel
->metadata_stream
->lock
);
1334 metadata_stream_reset_cache_consumed_position(
1335 channel
->metadata_stream
);
1336 pthread_mutex_unlock(&channel
->metadata_stream
->lock
);
1338 /* Validate we are in snapshot mode. */
1339 assert(!channel
->monitor
);
1342 case CONSUMER_METADATA_CACHE_WRITE_STATUS_APPENDED_CONTENT
:
1344 * In both cases, the metadata poll thread has new data to
1347 ret
= consumer_metadata_wakeup_pipe(channel
);
1349 ret_code
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
1353 case CONSUMER_METADATA_CACHE_WRITE_STATUS_ERROR
:
1354 /* Unable to handle metadata. Notify session daemon. */
1355 ret_code
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
1357 * Skip metadata flush on write error since the offset and len might
1358 * not have been updated which could create an infinite loop below when
1359 * waiting for the metadata cache to be flushed.
1369 while (consumer_metadata_cache_flushed(channel
, offset
+ len
, timer
)) {
1370 DBG("Waiting for metadata to be flushed");
1372 health_code_update();
1374 usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME
);
1384 * Receive command from session daemon and process it.
1386 * Return 1 on success else a negative value or 0.
1388 int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
1389 int sock
, struct pollfd
*consumer_sockpoll
)
1392 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
1393 struct lttcomm_consumer_msg msg
;
1394 struct lttng_consumer_channel
*channel
= NULL
;
1396 health_code_update();
1401 ret_recv
= lttcomm_recv_unix_sock(sock
, &msg
, sizeof(msg
));
1402 if (ret_recv
!= sizeof(msg
)) {
1403 DBG("Consumer received unexpected message size %zd (expects %zu)",
1404 ret_recv
, sizeof(msg
));
1406 * The ret value might 0 meaning an orderly shutdown but this is ok
1407 * since the caller handles this.
1410 lttng_consumer_send_error(ctx
,
1411 LTTCOMM_CONSUMERD_ERROR_RECV_CMD
);
1418 health_code_update();
1421 assert(msg
.cmd_type
!= LTTNG_CONSUMER_STOP
);
1423 health_code_update();
1425 /* relayd needs RCU read-side lock */
1428 switch (msg
.cmd_type
) {
1429 case LTTNG_CONSUMER_ADD_RELAYD_SOCKET
:
1431 /* Session daemon status message are handled in the following call. */
1432 consumer_add_relayd_socket(msg
.u
.relayd_sock
.net_index
,
1433 msg
.u
.relayd_sock
.type
, ctx
, sock
, consumer_sockpoll
,
1434 &msg
.u
.relayd_sock
.sock
, msg
.u
.relayd_sock
.session_id
,
1435 msg
.u
.relayd_sock
.relayd_session_id
);
1438 case LTTNG_CONSUMER_DESTROY_RELAYD
:
1440 uint64_t index
= msg
.u
.destroy_relayd
.net_seq_idx
;
1441 struct consumer_relayd_sock_pair
*relayd
;
1443 DBG("UST consumer destroying relayd %" PRIu64
, index
);
1445 /* Get relayd reference if exists. */
1446 relayd
= consumer_find_relayd(index
);
1447 if (relayd
== NULL
) {
1448 DBG("Unable to find relayd %" PRIu64
, index
);
1449 ret_code
= LTTCOMM_CONSUMERD_RELAYD_FAIL
;
1453 * Each relayd socket pair has a refcount of stream attached to it
1454 * which tells if the relayd is still active or not depending on the
1457 * This will set the destroy flag of the relayd object and destroy it
1458 * if the refcount reaches zero when called.
1460 * The destroy can happen either here or when a stream fd hangs up.
1463 consumer_flag_relayd_for_destroy(relayd
);
1466 goto end_msg_sessiond
;
1468 case LTTNG_CONSUMER_UPDATE_STREAM
:
1473 case LTTNG_CONSUMER_DATA_PENDING
:
1475 int is_data_pending
;
1477 uint64_t id
= msg
.u
.data_pending
.session_id
;
1479 DBG("UST consumer data pending command for id %" PRIu64
, id
);
1481 is_data_pending
= consumer_data_pending(id
);
1483 /* Send back returned value to session daemon */
1484 ret_send
= lttcomm_send_unix_sock(sock
, &is_data_pending
,
1485 sizeof(is_data_pending
));
1487 DBG("Error when sending the data pending ret code: %zd",
1493 * No need to send back a status message since the data pending
1494 * returned value is the response.
1498 case LTTNG_CONSUMER_ASK_CHANNEL_CREATION
:
1500 int ret_ask_channel
, ret_add_channel
, ret_send
;
1501 struct lttng_ust_ctl_consumer_channel_attr attr
;
1502 const uint64_t chunk_id
= msg
.u
.ask_channel
.chunk_id
.value
;
1503 const struct lttng_credentials buffer_credentials
= {
1504 .uid
= LTTNG_OPTIONAL_INIT_VALUE(msg
.u
.ask_channel
.buffer_credentials
.uid
),
1505 .gid
= LTTNG_OPTIONAL_INIT_VALUE(msg
.u
.ask_channel
.buffer_credentials
.gid
),
1508 /* Create a plain object and reserve a channel key. */
1509 channel
= consumer_allocate_channel(
1510 msg
.u
.ask_channel
.key
,
1511 msg
.u
.ask_channel
.session_id
,
1512 msg
.u
.ask_channel
.chunk_id
.is_set
?
1514 msg
.u
.ask_channel
.pathname
,
1515 msg
.u
.ask_channel
.name
,
1516 msg
.u
.ask_channel
.relayd_id
,
1517 (enum lttng_event_output
) msg
.u
.ask_channel
.output
,
1518 msg
.u
.ask_channel
.tracefile_size
,
1519 msg
.u
.ask_channel
.tracefile_count
,
1520 msg
.u
.ask_channel
.session_id_per_pid
,
1521 msg
.u
.ask_channel
.monitor
,
1522 msg
.u
.ask_channel
.live_timer_interval
,
1523 msg
.u
.ask_channel
.is_live
,
1524 msg
.u
.ask_channel
.root_shm_path
,
1525 msg
.u
.ask_channel
.shm_path
);
1527 goto end_channel_error
;
1530 LTTNG_OPTIONAL_SET(&channel
->buffer_credentials
,
1531 buffer_credentials
);
1534 * Assign UST application UID to the channel. This value is ignored for
1535 * per PID buffers. This is specific to UST thus setting this after the
1538 channel
->ust_app_uid
= msg
.u
.ask_channel
.ust_app_uid
;
1540 /* Build channel attributes from received message. */
1541 attr
.subbuf_size
= msg
.u
.ask_channel
.subbuf_size
;
1542 attr
.num_subbuf
= msg
.u
.ask_channel
.num_subbuf
;
1543 attr
.overwrite
= msg
.u
.ask_channel
.overwrite
;
1544 attr
.switch_timer_interval
= msg
.u
.ask_channel
.switch_timer_interval
;
1545 attr
.read_timer_interval
= msg
.u
.ask_channel
.read_timer_interval
;
1546 attr
.chan_id
= msg
.u
.ask_channel
.chan_id
;
1547 memcpy(attr
.uuid
, msg
.u
.ask_channel
.uuid
, sizeof(attr
.uuid
));
1548 attr
.blocking_timeout
= msg
.u
.ask_channel
.blocking_timeout
;
1550 /* Match channel buffer type to the UST abi. */
1551 switch (msg
.u
.ask_channel
.output
) {
1552 case LTTNG_EVENT_MMAP
:
1554 attr
.output
= LTTNG_UST_ABI_MMAP
;
1558 /* Translate and save channel type. */
1559 switch (msg
.u
.ask_channel
.type
) {
1560 case LTTNG_UST_ABI_CHAN_PER_CPU
:
1561 channel
->type
= CONSUMER_CHANNEL_TYPE_DATA
;
1562 attr
.type
= LTTNG_UST_ABI_CHAN_PER_CPU
;
1564 * Set refcount to 1 for owner. Below, we will
1565 * pass ownership to the
1566 * consumer_thread_channel_poll() thread.
1568 channel
->refcount
= 1;
1570 case LTTNG_UST_ABI_CHAN_METADATA
:
1571 channel
->type
= CONSUMER_CHANNEL_TYPE_METADATA
;
1572 attr
.type
= LTTNG_UST_ABI_CHAN_METADATA
;
1579 health_code_update();
1581 ret_ask_channel
= ask_channel(ctx
, channel
, &attr
);
1582 if (ret_ask_channel
< 0) {
1583 goto end_channel_error
;
1586 if (msg
.u
.ask_channel
.type
== LTTNG_UST_ABI_CHAN_METADATA
) {
1589 ret_allocate
= consumer_metadata_cache_allocate(
1591 if (ret_allocate
< 0) {
1592 ERR("Allocating metadata cache");
1593 goto end_channel_error
;
1595 consumer_timer_switch_start(channel
, attr
.switch_timer_interval
);
1596 attr
.switch_timer_interval
= 0;
1598 int monitor_start_ret
;
1600 consumer_timer_live_start(channel
,
1601 msg
.u
.ask_channel
.live_timer_interval
);
1602 monitor_start_ret
= consumer_timer_monitor_start(
1604 msg
.u
.ask_channel
.monitor_timer_interval
);
1605 if (monitor_start_ret
< 0) {
1606 ERR("Starting channel monitoring timer failed");
1607 goto end_channel_error
;
1611 health_code_update();
1614 * Add the channel to the internal state AFTER all streams were created
1615 * and successfully sent to session daemon. This way, all streams must
1616 * be ready before this channel is visible to the threads.
1617 * If add_channel succeeds, ownership of the channel is
1618 * passed to consumer_thread_channel_poll().
1620 ret_add_channel
= add_channel(channel
, ctx
);
1621 if (ret_add_channel
< 0) {
1622 if (msg
.u
.ask_channel
.type
== LTTNG_UST_ABI_CHAN_METADATA
) {
1623 if (channel
->switch_timer_enabled
== 1) {
1624 consumer_timer_switch_stop(channel
);
1626 consumer_metadata_cache_destroy(channel
);
1628 if (channel
->live_timer_enabled
== 1) {
1629 consumer_timer_live_stop(channel
);
1631 if (channel
->monitor_timer_enabled
== 1) {
1632 consumer_timer_monitor_stop(channel
);
1634 goto end_channel_error
;
1637 health_code_update();
1640 * Channel and streams are now created. Inform the session daemon that
1641 * everything went well and should wait to receive the channel and
1642 * streams with ustctl API.
1644 ret_send
= consumer_send_status_channel(sock
, channel
);
1647 * There is probably a problem on the socket.
1654 case LTTNG_CONSUMER_GET_CHANNEL
:
1656 int ret
, relayd_err
= 0;
1657 uint64_t key
= msg
.u
.get_channel
.key
;
1658 struct lttng_consumer_channel
*found_channel
;
1660 found_channel
= consumer_find_channel(key
);
1661 if (!found_channel
) {
1662 ERR("UST consumer get channel key %" PRIu64
" not found", key
);
1663 ret_code
= LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
;
1664 goto end_get_channel
;
1667 health_code_update();
1669 /* Send the channel to sessiond (and relayd, if applicable). */
1670 ret
= send_channel_to_sessiond_and_relayd(
1671 sock
, found_channel
, ctx
, &relayd_err
);
1675 * We were unable to send to the relayd the stream so avoid
1676 * sending back a fatal error to the thread since this is OK
1677 * and the consumer can continue its work. The above call
1678 * has sent the error status message to the sessiond.
1680 goto end_get_channel_nosignal
;
1683 * The communicaton was broken hence there is a bad state between
1684 * the consumer and sessiond so stop everything.
1686 goto error_get_channel_fatal
;
1689 health_code_update();
1692 * In no monitor mode, the streams ownership is kept inside the channel
1693 * so don't send them to the data thread.
1695 if (!found_channel
->monitor
) {
1696 goto end_get_channel
;
1699 ret
= send_streams_to_thread(found_channel
, ctx
);
1702 * If we are unable to send the stream to the thread, there is
1703 * a big problem so just stop everything.
1705 goto error_get_channel_fatal
;
1707 /* List MUST be empty after or else it could be reused. */
1708 assert(cds_list_empty(&found_channel
->streams
.head
));
1710 goto end_msg_sessiond
;
1711 error_get_channel_fatal
:
1713 end_get_channel_nosignal
:
1716 case LTTNG_CONSUMER_DESTROY_CHANNEL
:
1718 uint64_t key
= msg
.u
.destroy_channel
.key
;
1721 * Only called if streams have not been sent to stream
1722 * manager thread. However, channel has been sent to
1723 * channel manager thread.
1725 notify_thread_del_channel(ctx
, key
);
1726 goto end_msg_sessiond
;
1728 case LTTNG_CONSUMER_CLOSE_METADATA
:
1732 ret
= close_metadata(msg
.u
.close_metadata
.key
);
1737 goto end_msg_sessiond
;
1739 case LTTNG_CONSUMER_FLUSH_CHANNEL
:
1743 ret
= flush_channel(msg
.u
.flush_channel
.key
);
1748 goto end_msg_sessiond
;
1750 case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL
:
1754 ret
= clear_quiescent_channel(
1755 msg
.u
.clear_quiescent_channel
.key
);
1760 goto end_msg_sessiond
;
1762 case LTTNG_CONSUMER_PUSH_METADATA
:
1765 uint64_t len
= msg
.u
.push_metadata
.len
;
1766 uint64_t key
= msg
.u
.push_metadata
.key
;
1767 uint64_t offset
= msg
.u
.push_metadata
.target_offset
;
1768 uint64_t version
= msg
.u
.push_metadata
.version
;
1769 struct lttng_consumer_channel
*found_channel
;
1771 DBG("UST consumer push metadata key %" PRIu64
" of len %" PRIu64
, key
,
1774 found_channel
= consumer_find_channel(key
);
1775 if (!found_channel
) {
1777 * This is possible if the metadata creation on the consumer side
1778 * is in flight vis-a-vis a concurrent push metadata from the
1779 * session daemon. Simply return that the channel failed and the
1780 * session daemon will handle that message correctly considering
1781 * that this race is acceptable thus the DBG() statement here.
1783 DBG("UST consumer push metadata %" PRIu64
" not found", key
);
1784 ret_code
= LTTCOMM_CONSUMERD_CHANNEL_FAIL
;
1785 goto end_push_metadata_msg_sessiond
;
1788 health_code_update();
1792 * There is nothing to receive. We have simply
1793 * checked whether the channel can be found.
1795 ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
1796 goto end_push_metadata_msg_sessiond
;
1799 /* Tell session daemon we are ready to receive the metadata. */
1800 ret
= consumer_send_status_msg(sock
, LTTCOMM_CONSUMERD_SUCCESS
);
1802 /* Somehow, the session daemon is not responding anymore. */
1803 goto error_push_metadata_fatal
;
1806 health_code_update();
1808 /* Wait for more data. */
1809 health_poll_entry();
1810 ret
= lttng_consumer_poll_socket(consumer_sockpoll
);
1813 goto error_push_metadata_fatal
;
1816 health_code_update();
1818 ret
= lttng_ustconsumer_recv_metadata(sock
, key
, offset
, len
,
1819 version
, found_channel
, 0, 1);
1821 /* error receiving from sessiond */
1822 goto error_push_metadata_fatal
;
1825 goto end_push_metadata_msg_sessiond
;
1827 end_push_metadata_msg_sessiond
:
1828 goto end_msg_sessiond
;
1829 error_push_metadata_fatal
:
1832 case LTTNG_CONSUMER_SETUP_METADATA
:
1836 ret
= setup_metadata(ctx
, msg
.u
.setup_metadata
.key
);
1840 goto end_msg_sessiond
;
1842 case LTTNG_CONSUMER_SNAPSHOT_CHANNEL
:
1844 struct lttng_consumer_channel
*found_channel
;
1845 uint64_t key
= msg
.u
.snapshot_channel
.key
;
1848 found_channel
= consumer_find_channel(key
);
1849 if (!found_channel
) {
1850 DBG("UST snapshot channel not found for key %" PRIu64
, key
);
1851 ret_code
= LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
;
1853 if (msg
.u
.snapshot_channel
.metadata
) {
1856 ret_snapshot
= snapshot_metadata(found_channel
,
1858 msg
.u
.snapshot_channel
.pathname
,
1859 msg
.u
.snapshot_channel
.relayd_id
,
1861 if (ret_snapshot
< 0) {
1862 ERR("Snapshot metadata failed");
1863 ret_code
= LTTCOMM_CONSUMERD_SNAPSHOT_FAILED
;
1868 ret_snapshot
= snapshot_channel(found_channel
,
1870 msg
.u
.snapshot_channel
.pathname
,
1871 msg
.u
.snapshot_channel
.relayd_id
,
1872 msg
.u
.snapshot_channel
1873 .nb_packets_per_stream
,
1875 if (ret_snapshot
< 0) {
1876 ERR("Snapshot channel failed");
1877 ret_code
= LTTCOMM_CONSUMERD_SNAPSHOT_FAILED
;
1881 health_code_update();
1882 ret_send
= consumer_send_status_msg(sock
, ret_code
);
1884 /* Somehow, the session daemon is not responding anymore. */
1887 health_code_update();
1890 case LTTNG_CONSUMER_DISCARDED_EVENTS
:
1893 uint64_t discarded_events
;
1894 struct lttng_ht_iter iter
;
1895 struct lttng_ht
*ht
;
1896 struct lttng_consumer_stream
*stream
;
1897 uint64_t id
= msg
.u
.discarded_events
.session_id
;
1898 uint64_t key
= msg
.u
.discarded_events
.channel_key
;
1900 DBG("UST consumer discarded events command for session id %"
1903 pthread_mutex_lock(&the_consumer_data
.lock
);
1905 ht
= the_consumer_data
.stream_list_ht
;
1908 * We only need a reference to the channel, but they are not
1909 * directly indexed, so we just use the first matching stream
1910 * to extract the information we need, we default to 0 if not
1911 * found (no events are dropped if the channel is not yet in
1914 discarded_events
= 0;
1915 cds_lfht_for_each_entry_duplicate(ht
->ht
,
1916 ht
->hash_fct(&id
, lttng_ht_seed
),
1918 &iter
.iter
, stream
, node_session_id
.node
) {
1919 if (stream
->chan
->key
== key
) {
1920 discarded_events
= stream
->chan
->discarded_events
;
1924 pthread_mutex_unlock(&the_consumer_data
.lock
);
1927 DBG("UST consumer discarded events command for session id %"
1928 PRIu64
", channel key %" PRIu64
, id
, key
);
1930 health_code_update();
1932 /* Send back returned value to session daemon */
1933 ret
= lttcomm_send_unix_sock(sock
, &discarded_events
, sizeof(discarded_events
));
1935 PERROR("send discarded events");
1941 case LTTNG_CONSUMER_LOST_PACKETS
:
1944 uint64_t lost_packets
;
1945 struct lttng_ht_iter iter
;
1946 struct lttng_ht
*ht
;
1947 struct lttng_consumer_stream
*stream
;
1948 uint64_t id
= msg
.u
.lost_packets
.session_id
;
1949 uint64_t key
= msg
.u
.lost_packets
.channel_key
;
1951 DBG("UST consumer lost packets command for session id %"
1954 pthread_mutex_lock(&the_consumer_data
.lock
);
1956 ht
= the_consumer_data
.stream_list_ht
;
1959 * We only need a reference to the channel, but they are not
1960 * directly indexed, so we just use the first matching stream
1961 * to extract the information we need, we default to 0 if not
1962 * found (no packets lost if the channel is not yet in use).
1965 cds_lfht_for_each_entry_duplicate(ht
->ht
,
1966 ht
->hash_fct(&id
, lttng_ht_seed
),
1968 &iter
.iter
, stream
, node_session_id
.node
) {
1969 if (stream
->chan
->key
== key
) {
1970 lost_packets
= stream
->chan
->lost_packets
;
1974 pthread_mutex_unlock(&the_consumer_data
.lock
);
1977 DBG("UST consumer lost packets command for session id %"
1978 PRIu64
", channel key %" PRIu64
, id
, key
);
1980 health_code_update();
1982 /* Send back returned value to session daemon */
1983 ret
= lttcomm_send_unix_sock(sock
, &lost_packets
,
1984 sizeof(lost_packets
));
1986 PERROR("send lost packets");
1992 case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE
:
1994 int channel_monitor_pipe
, ret_send
,
1995 ret_set_channel_monitor_pipe
;
1998 ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
1999 /* Successfully received the command's type. */
2000 ret_send
= consumer_send_status_msg(sock
, ret_code
);
2005 ret_recv
= lttcomm_recv_fds_unix_sock(
2006 sock
, &channel_monitor_pipe
, 1);
2007 if (ret_recv
!= sizeof(channel_monitor_pipe
)) {
2008 ERR("Failed to receive channel monitor pipe");
2012 DBG("Received channel monitor pipe (%d)", channel_monitor_pipe
);
2013 ret_set_channel_monitor_pipe
=
2014 consumer_timer_thread_set_channel_monitor_pipe(
2015 channel_monitor_pipe
);
2016 if (!ret_set_channel_monitor_pipe
) {
2020 ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
2021 /* Set the pipe as non-blocking. */
2022 ret_fcntl
= fcntl(channel_monitor_pipe
, F_GETFL
, 0);
2023 if (ret_fcntl
== -1) {
2024 PERROR("fcntl get flags of the channel monitoring pipe");
2029 ret_fcntl
= fcntl(channel_monitor_pipe
, F_SETFL
,
2030 flags
| O_NONBLOCK
);
2031 if (ret_fcntl
== -1) {
2032 PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe");
2035 DBG("Channel monitor pipe set as non-blocking");
2037 ret_code
= LTTCOMM_CONSUMERD_ALREADY_SET
;
2039 goto end_msg_sessiond
;
2041 case LTTNG_CONSUMER_ROTATE_CHANNEL
:
2043 struct lttng_consumer_channel
*found_channel
;
2044 uint64_t key
= msg
.u
.rotate_channel
.key
;
2045 int ret_send_status
;
2047 found_channel
= consumer_find_channel(key
);
2048 if (!found_channel
) {
2049 DBG("Channel %" PRIu64
" not found", key
);
2050 ret_code
= LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
;
2055 * Sample the rotate position of all the streams in
2058 rotate_channel
= lttng_consumer_rotate_channel(
2060 msg
.u
.rotate_channel
.relayd_id
,
2061 msg
.u
.rotate_channel
.metadata
, ctx
);
2062 if (rotate_channel
< 0) {
2063 ERR("Rotate channel failed");
2064 ret_code
= LTTCOMM_CONSUMERD_ROTATION_FAIL
;
2067 health_code_update();
2070 ret_send_status
= consumer_send_status_msg(sock
, ret_code
);
2071 if (ret_send_status
< 0) {
2072 /* Somehow, the session daemon is not responding anymore. */
2073 goto end_rotate_channel_nosignal
;
2077 * Rotate the streams that are ready right now.
2078 * FIXME: this is a second consecutive iteration over the
2079 * streams in a channel, there is probably a better way to
2080 * handle this, but it needs to be after the
2081 * consumer_send_status_msg() call.
2083 if (found_channel
) {
2084 int ret_rotate_read_streams
;
2086 ret_rotate_read_streams
=
2087 lttng_consumer_rotate_ready_streams(
2090 if (ret_rotate_read_streams
< 0) {
2091 ERR("Rotate channel failed");
2095 end_rotate_channel_nosignal
:
2098 case LTTNG_CONSUMER_CLEAR_CHANNEL
:
2100 struct lttng_consumer_channel
*found_channel
;
2101 uint64_t key
= msg
.u
.clear_channel
.key
;
2102 int ret_send_status
;
2104 found_channel
= consumer_find_channel(key
);
2105 if (!found_channel
) {
2106 DBG("Channel %" PRIu64
" not found", key
);
2107 ret_code
= LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
;
2109 int ret_clear_channel
;
2111 ret_clear_channel
= lttng_consumer_clear_channel(
2113 if (ret_clear_channel
) {
2114 ERR("Clear channel failed key %" PRIu64
, key
);
2115 ret_code
= ret_clear_channel
;
2118 health_code_update();
2120 ret_send_status
= consumer_send_status_msg(sock
, ret_code
);
2121 if (ret_send_status
< 0) {
2122 /* Somehow, the session daemon is not responding anymore. */
2127 case LTTNG_CONSUMER_INIT
:
2129 int ret_send_status
;
2131 ret_code
= lttng_consumer_init_command(ctx
,
2132 msg
.u
.init
.sessiond_uuid
);
2133 health_code_update();
2134 ret_send_status
= consumer_send_status_msg(sock
, ret_code
);
2135 if (ret_send_status
< 0) {
2136 /* Somehow, the session daemon is not responding anymore. */
2141 case LTTNG_CONSUMER_CREATE_TRACE_CHUNK
:
2143 const struct lttng_credentials credentials
= {
2144 .uid
= LTTNG_OPTIONAL_INIT_VALUE(msg
.u
.create_trace_chunk
.credentials
.value
.uid
),
2145 .gid
= LTTNG_OPTIONAL_INIT_VALUE(msg
.u
.create_trace_chunk
.credentials
.value
.gid
),
2147 const bool is_local_trace
=
2148 !msg
.u
.create_trace_chunk
.relayd_id
.is_set
;
2149 const uint64_t relayd_id
=
2150 msg
.u
.create_trace_chunk
.relayd_id
.value
;
2151 const char *chunk_override_name
=
2152 *msg
.u
.create_trace_chunk
.override_name
?
2153 msg
.u
.create_trace_chunk
.override_name
:
2155 struct lttng_directory_handle
*chunk_directory_handle
= NULL
;
2158 * The session daemon will only provide a chunk directory file
2159 * descriptor for local traces.
2161 if (is_local_trace
) {
2163 int ret_send_status
;
2166 /* Acnowledge the reception of the command. */
2167 ret_send_status
= consumer_send_status_msg(
2168 sock
, LTTCOMM_CONSUMERD_SUCCESS
);
2169 if (ret_send_status
< 0) {
2170 /* Somehow, the session daemon is not responding anymore. */
2175 * Receive trace chunk domain dirfd.
2177 ret_recv
= lttcomm_recv_fds_unix_sock(
2178 sock
, &chunk_dirfd
, 1);
2179 if (ret_recv
!= sizeof(chunk_dirfd
)) {
2180 ERR("Failed to receive trace chunk domain directory file descriptor");
2184 DBG("Received trace chunk domain directory fd (%d)",
2186 chunk_directory_handle
= lttng_directory_handle_create_from_dirfd(
2188 if (!chunk_directory_handle
) {
2189 ERR("Failed to initialize chunk domain directory handle from directory file descriptor");
2190 if (close(chunk_dirfd
)) {
2191 PERROR("Failed to close chunk directory file descriptor");
2197 ret_code
= lttng_consumer_create_trace_chunk(
2198 !is_local_trace
? &relayd_id
: NULL
,
2199 msg
.u
.create_trace_chunk
.session_id
,
2200 msg
.u
.create_trace_chunk
.chunk_id
,
2201 (time_t) msg
.u
.create_trace_chunk
2202 .creation_timestamp
,
2203 chunk_override_name
,
2204 msg
.u
.create_trace_chunk
.credentials
.is_set
?
2207 chunk_directory_handle
);
2208 lttng_directory_handle_put(chunk_directory_handle
);
2209 goto end_msg_sessiond
;
2211 case LTTNG_CONSUMER_CLOSE_TRACE_CHUNK
:
2213 enum lttng_trace_chunk_command_type close_command
=
2214 msg
.u
.close_trace_chunk
.close_command
.value
;
2215 const uint64_t relayd_id
=
2216 msg
.u
.close_trace_chunk
.relayd_id
.value
;
2217 struct lttcomm_consumer_close_trace_chunk_reply reply
;
2218 char closed_trace_chunk_path
[LTTNG_PATH_MAX
] = {};
2221 ret_code
= lttng_consumer_close_trace_chunk(
2222 msg
.u
.close_trace_chunk
.relayd_id
.is_set
?
2225 msg
.u
.close_trace_chunk
.session_id
,
2226 msg
.u
.close_trace_chunk
.chunk_id
,
2227 (time_t) msg
.u
.close_trace_chunk
.close_timestamp
,
2228 msg
.u
.close_trace_chunk
.close_command
.is_set
?
2230 NULL
, closed_trace_chunk_path
);
2231 reply
.ret_code
= ret_code
;
2232 reply
.path_length
= strlen(closed_trace_chunk_path
) + 1;
2233 ret
= lttcomm_send_unix_sock(sock
, &reply
, sizeof(reply
));
2234 if (ret
!= sizeof(reply
)) {
2237 ret
= lttcomm_send_unix_sock(sock
, closed_trace_chunk_path
,
2239 if (ret
!= reply
.path_length
) {
2244 case LTTNG_CONSUMER_TRACE_CHUNK_EXISTS
:
2246 const uint64_t relayd_id
=
2247 msg
.u
.trace_chunk_exists
.relayd_id
.value
;
2249 ret_code
= lttng_consumer_trace_chunk_exists(
2250 msg
.u
.trace_chunk_exists
.relayd_id
.is_set
?
2252 msg
.u
.trace_chunk_exists
.session_id
,
2253 msg
.u
.trace_chunk_exists
.chunk_id
);
2254 goto end_msg_sessiond
;
2256 case LTTNG_CONSUMER_OPEN_CHANNEL_PACKETS
:
2258 const uint64_t key
= msg
.u
.open_channel_packets
.key
;
2259 struct lttng_consumer_channel
*found_channel
=
2260 consumer_find_channel(key
);
2262 if (found_channel
) {
2263 pthread_mutex_lock(&found_channel
->lock
);
2264 ret_code
= lttng_consumer_open_channel_packets(
2266 pthread_mutex_unlock(&found_channel
->lock
);
2269 * The channel could have disappeared in per-pid
2272 DBG("Channel %" PRIu64
" not found", key
);
2273 ret_code
= LTTCOMM_CONSUMERD_CHAN_NOT_FOUND
;
2276 health_code_update();
2277 goto end_msg_sessiond
;
2285 * Return 1 to indicate success since the 0 value can be a socket
2286 * shutdown during the recv() or send() call.
2293 * The returned value here is not useful since either way we'll return 1 to
2294 * the caller because the session daemon socket management is done
2295 * elsewhere. Returning a negative code or 0 will shutdown the consumer.
2298 int ret_send_status
;
2300 ret_send_status
= consumer_send_status_msg(sock
, ret_code
);
2301 if (ret_send_status
< 0) {
2312 * Free channel here since no one has a reference to it. We don't
2313 * free after that because a stream can store this pointer.
2315 destroy_channel(channel
);
2317 /* We have to send a status channel message indicating an error. */
2319 int ret_send_status
;
2321 ret_send_status
= consumer_send_status_channel(sock
, NULL
);
2322 if (ret_send_status
< 0) {
2323 /* Stop everything if session daemon can not be notified. */
2332 /* This will issue a consumer stop. */
2338 health_code_update();
2342 int lttng_ust_flush_buffer(struct lttng_consumer_stream
*stream
,
2343 int producer_active
)
2346 assert(stream
->ustream
);
2348 return lttng_ust_ctl_flush_buffer(stream
->ustream
, producer_active
);
2352 * Take a snapshot for a specific stream.
2354 * Returns 0 on success, < 0 on error
2356 int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream
*stream
)
2359 assert(stream
->ustream
);
2361 return lttng_ust_ctl_snapshot(stream
->ustream
);
2365 * Sample consumed and produced positions for a specific stream.
2367 * Returns 0 on success, < 0 on error.
2369 int lttng_ustconsumer_sample_snapshot_positions(
2370 struct lttng_consumer_stream
*stream
)
2373 assert(stream
->ustream
);
2375 return lttng_ust_ctl_snapshot_sample_positions(stream
->ustream
);
2379 * Get the produced position
2381 * Returns 0 on success, < 0 on error
2383 int lttng_ustconsumer_get_produced_snapshot(
2384 struct lttng_consumer_stream
*stream
, unsigned long *pos
)
2387 assert(stream
->ustream
);
2390 return lttng_ust_ctl_snapshot_get_produced(stream
->ustream
, pos
);
2394 * Get the consumed position
2396 * Returns 0 on success, < 0 on error
2398 int lttng_ustconsumer_get_consumed_snapshot(
2399 struct lttng_consumer_stream
*stream
, unsigned long *pos
)
2402 assert(stream
->ustream
);
2405 return lttng_ust_ctl_snapshot_get_consumed(stream
->ustream
, pos
);
2408 int lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream
*stream
,
2412 assert(stream
->ustream
);
2414 return lttng_ust_ctl_flush_buffer(stream
->ustream
, producer
);
2417 int lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream
*stream
)
2420 assert(stream
->ustream
);
2422 return lttng_ust_ctl_clear_buffer(stream
->ustream
);
2425 int lttng_ustconsumer_get_current_timestamp(
2426 struct lttng_consumer_stream
*stream
, uint64_t *ts
)
2429 assert(stream
->ustream
);
2432 return lttng_ust_ctl_get_current_timestamp(stream
->ustream
, ts
);
2435 int lttng_ustconsumer_get_sequence_number(
2436 struct lttng_consumer_stream
*stream
, uint64_t *seq
)
2439 assert(stream
->ustream
);
2442 return lttng_ust_ctl_get_sequence_number(stream
->ustream
, seq
);
2446 * Called when the stream signals the consumer that it has hung up.
2448 void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream
*stream
)
2451 assert(stream
->ustream
);
2453 pthread_mutex_lock(&stream
->lock
);
2454 if (!stream
->quiescent
) {
2455 if (lttng_ust_ctl_flush_buffer(stream
->ustream
, 0) < 0) {
2456 ERR("Failed to flush buffer on stream hang-up");
2458 stream
->quiescent
= true;
2461 pthread_mutex_unlock(&stream
->lock
);
2462 stream
->hangup_flush_done
= 1;
2465 void lttng_ustconsumer_del_channel(struct lttng_consumer_channel
*chan
)
2470 assert(chan
->uchan
);
2471 assert(chan
->buffer_credentials
.is_set
);
2473 if (chan
->switch_timer_enabled
== 1) {
2474 consumer_timer_switch_stop(chan
);
2476 for (i
= 0; i
< chan
->nr_stream_fds
; i
++) {
2479 ret
= close(chan
->stream_fds
[i
]);
2483 if (chan
->shm_path
[0]) {
2484 char shm_path
[PATH_MAX
];
2486 ret
= get_stream_shm_path(shm_path
, chan
->shm_path
, i
);
2488 ERR("Cannot get stream shm path");
2490 ret
= run_as_unlink(shm_path
,
2491 lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR(
2492 chan
->buffer_credentials
)),
2493 lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR(
2494 chan
->buffer_credentials
)));
2496 PERROR("unlink %s", shm_path
);
2502 void lttng_ustconsumer_free_channel(struct lttng_consumer_channel
*chan
)
2505 assert(chan
->uchan
);
2506 assert(chan
->buffer_credentials
.is_set
);
2508 consumer_metadata_cache_destroy(chan
);
2509 lttng_ust_ctl_destroy_channel(chan
->uchan
);
2510 /* Try to rmdir all directories under shm_path root. */
2511 if (chan
->root_shm_path
[0]) {
2512 (void) run_as_rmdir_recursive(chan
->root_shm_path
,
2513 lttng_credentials_get_uid(LTTNG_OPTIONAL_GET_PTR(
2514 chan
->buffer_credentials
)),
2515 lttng_credentials_get_gid(LTTNG_OPTIONAL_GET_PTR(
2516 chan
->buffer_credentials
)),
2517 LTTNG_DIRECTORY_HANDLE_SKIP_NON_EMPTY_FLAG
);
2519 free(chan
->stream_fds
);
2522 void lttng_ustconsumer_del_stream(struct lttng_consumer_stream
*stream
)
2525 assert(stream
->ustream
);
2527 if (stream
->chan
->switch_timer_enabled
== 1) {
2528 consumer_timer_switch_stop(stream
->chan
);
2530 lttng_ust_ctl_destroy_stream(stream
->ustream
);
2533 int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream
*stream
)
2536 assert(stream
->ustream
);
2538 return lttng_ust_ctl_stream_get_wakeup_fd(stream
->ustream
);
2541 int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream
*stream
)
2544 assert(stream
->ustream
);
2546 return lttng_ust_ctl_stream_close_wakeup_fd(stream
->ustream
);
2550 * Write up to one packet from the metadata cache to the channel.
2552 * Returns the number of bytes pushed from the cache into the ring buffer, or a
2553 * negative value on error.
2556 int commit_one_metadata_packet(struct lttng_consumer_stream
*stream
)
2561 pthread_mutex_lock(&stream
->chan
->metadata_cache
->lock
);
2562 if (stream
->chan
->metadata_cache
->contents
.size
==
2563 stream
->ust_metadata_pushed
) {
2565 * In the context of a user space metadata channel, a
2566 * change in version can be detected in two ways:
2567 * 1) During the pre-consume of the `read_subbuffer` loop,
2568 * 2) When populating the metadata ring buffer (i.e. here).
2570 * This function is invoked when there is no metadata
2571 * available in the ring-buffer. If all data was consumed
2572 * up to the size of the metadata cache, there is no metadata
2573 * to insert in the ring-buffer.
2575 * However, the metadata version could still have changed (a
2576 * regeneration without any new data will yield the same cache
2579 * The cache's version is checked for a version change and the
2580 * consumed position is reset if one occurred.
2582 * This check is only necessary for the user space domain as
2583 * it has to manage the cache explicitly. If this reset was not
2584 * performed, no metadata would be consumed (and no reset would
2585 * occur as part of the pre-consume) until the metadata size
2586 * exceeded the cache size.
2588 if (stream
->metadata_version
!=
2589 stream
->chan
->metadata_cache
->version
) {
2590 metadata_stream_reset_cache_consumed_position(stream
);
2591 consumer_stream_metadata_set_version(stream
,
2592 stream
->chan
->metadata_cache
->version
);
2599 write_len
= lttng_ust_ctl_write_one_packet_to_channel(stream
->chan
->uchan
,
2600 &stream
->chan
->metadata_cache
->contents
.data
[stream
->ust_metadata_pushed
],
2601 stream
->chan
->metadata_cache
->contents
.size
-
2602 stream
->ust_metadata_pushed
);
2603 assert(write_len
!= 0);
2604 if (write_len
< 0) {
2605 ERR("Writing one metadata packet");
2609 stream
->ust_metadata_pushed
+= write_len
;
2611 assert(stream
->chan
->metadata_cache
->contents
.size
>=
2612 stream
->ust_metadata_pushed
);
2616 * Switch packet (but don't open the next one) on every commit of
2617 * a metadata packet. Since the subbuffer is fully filled (with padding,
2618 * if needed), the stream is "quiescent" after this commit.
2620 if (lttng_ust_ctl_flush_buffer(stream
->ustream
, 1)) {
2621 ERR("Failed to flush buffer while commiting one metadata packet");
2624 stream
->quiescent
= true;
2627 pthread_mutex_unlock(&stream
->chan
->metadata_cache
->lock
);
2633 * Sync metadata meaning request them to the session daemon and snapshot to the
2634 * metadata thread can consumer them.
2636 * Metadata stream lock is held here, but we need to release it when
2637 * interacting with sessiond, else we cause a deadlock with live
2638 * awaiting on metadata to be pushed out.
2640 * The RCU read side lock must be held by the caller.
2642 enum sync_metadata_status
lttng_ustconsumer_sync_metadata(
2643 struct lttng_consumer_local_data
*ctx
,
2644 struct lttng_consumer_stream
*metadata_stream
)
2647 enum sync_metadata_status status
;
2648 struct lttng_consumer_channel
*metadata_channel
;
2651 assert(metadata_stream
);
2653 metadata_channel
= metadata_stream
->chan
;
2654 pthread_mutex_unlock(&metadata_stream
->lock
);
2656 * Request metadata from the sessiond, but don't wait for the flush
2657 * because we locked the metadata thread.
2659 ret
= lttng_ustconsumer_request_metadata(ctx
, metadata_channel
, 0, 0);
2660 pthread_mutex_lock(&metadata_stream
->lock
);
2662 status
= SYNC_METADATA_STATUS_ERROR
;
2667 * The metadata stream and channel can be deleted while the
2668 * metadata stream lock was released. The streamed is checked
2669 * for deletion before we use it further.
2671 * Note that it is safe to access a logically-deleted stream since its
2672 * existence is still guaranteed by the RCU read side lock. However,
2673 * it should no longer be used. The close/deletion of the metadata
2674 * channel and stream already guarantees that all metadata has been
2675 * consumed. Therefore, there is nothing left to do in this function.
2677 if (consumer_stream_is_deleted(metadata_stream
)) {
2678 DBG("Metadata stream %" PRIu64
" was deleted during the metadata synchronization",
2679 metadata_stream
->key
);
2680 status
= SYNC_METADATA_STATUS_NO_DATA
;
2684 ret
= commit_one_metadata_packet(metadata_stream
);
2686 status
= SYNC_METADATA_STATUS_ERROR
;
2688 } else if (ret
> 0) {
2689 status
= SYNC_METADATA_STATUS_NEW_DATA
;
2690 } else /* ret == 0 */ {
2691 status
= SYNC_METADATA_STATUS_NO_DATA
;
2695 ret
= lttng_ust_ctl_snapshot(metadata_stream
->ustream
);
2697 ERR("Failed to take a snapshot of the metadata ring-buffer positions, ret = %d", ret
);
2698 status
= SYNC_METADATA_STATUS_ERROR
;
2707 * Return 0 on success else a negative value.
2709 static int notify_if_more_data(struct lttng_consumer_stream
*stream
,
2710 struct lttng_consumer_local_data
*ctx
)
2713 struct lttng_ust_ctl_consumer_stream
*ustream
;
2718 ustream
= stream
->ustream
;
2721 * First, we are going to check if there is a new subbuffer available
2722 * before reading the stream wait_fd.
2724 /* Get the next subbuffer */
2725 ret
= lttng_ust_ctl_get_next_subbuf(ustream
);
2727 /* No more data found, flag the stream. */
2728 stream
->has_data
= 0;
2733 ret
= lttng_ust_ctl_put_subbuf(ustream
);
2736 /* This stream still has data. Flag it and wake up the data thread. */
2737 stream
->has_data
= 1;
2739 if (stream
->monitor
&& !stream
->hangup_flush_done
&& !ctx
->has_wakeup
) {
2742 writelen
= lttng_pipe_write(ctx
->consumer_wakeup_pipe
, "!", 1);
2743 if (writelen
< 0 && errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
2748 /* The wake up pipe has been notified. */
2749 ctx
->has_wakeup
= 1;
2757 static int consumer_stream_ust_on_wake_up(struct lttng_consumer_stream
*stream
)
2762 * We can consume the 1 byte written into the wait_fd by
2763 * UST. Don't trigger error if we cannot read this one byte
2764 * (read returns 0), or if the error is EAGAIN or EWOULDBLOCK.
2766 * This is only done when the stream is monitored by a thread,
2767 * before the flush is done after a hangup and if the stream
2768 * is not flagged with data since there might be nothing to
2769 * consume in the wait fd but still have data available
2770 * flagged by the consumer wake up pipe.
2772 if (stream
->monitor
&& !stream
->hangup_flush_done
&& !stream
->has_data
) {
2776 readlen
= lttng_read(stream
->wait_fd
, &dummy
, 1);
2777 if (readlen
< 0 && errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
2785 static int extract_common_subbuffer_info(struct lttng_consumer_stream
*stream
,
2786 struct stream_subbuffer
*subbuf
)
2790 ret
= lttng_ust_ctl_get_subbuf_size(
2791 stream
->ustream
, &subbuf
->info
.data
.subbuf_size
);
2796 ret
= lttng_ust_ctl_get_padded_subbuf_size(
2797 stream
->ustream
, &subbuf
->info
.data
.padded_subbuf_size
);
2806 static int extract_metadata_subbuffer_info(struct lttng_consumer_stream
*stream
,
2807 struct stream_subbuffer
*subbuf
)
2811 ret
= extract_common_subbuffer_info(stream
, subbuf
);
2816 subbuf
->info
.metadata
.version
= stream
->metadata_version
;
2822 static int extract_data_subbuffer_info(struct lttng_consumer_stream
*stream
,
2823 struct stream_subbuffer
*subbuf
)
2827 ret
= extract_common_subbuffer_info(stream
, subbuf
);
2832 ret
= lttng_ust_ctl_get_packet_size(
2833 stream
->ustream
, &subbuf
->info
.data
.packet_size
);
2835 PERROR("Failed to get sub-buffer packet size");
2839 ret
= lttng_ust_ctl_get_content_size(
2840 stream
->ustream
, &subbuf
->info
.data
.content_size
);
2842 PERROR("Failed to get sub-buffer content size");
2846 ret
= lttng_ust_ctl_get_timestamp_begin(
2847 stream
->ustream
, &subbuf
->info
.data
.timestamp_begin
);
2849 PERROR("Failed to get sub-buffer begin timestamp");
2853 ret
= lttng_ust_ctl_get_timestamp_end(
2854 stream
->ustream
, &subbuf
->info
.data
.timestamp_end
);
2856 PERROR("Failed to get sub-buffer end timestamp");
2860 ret
= lttng_ust_ctl_get_events_discarded(
2861 stream
->ustream
, &subbuf
->info
.data
.events_discarded
);
2863 PERROR("Failed to get sub-buffer events discarded count");
2867 ret
= lttng_ust_ctl_get_sequence_number(stream
->ustream
,
2868 &subbuf
->info
.data
.sequence_number
.value
);
2870 /* May not be supported by older LTTng-modules. */
2871 if (ret
!= -ENOTTY
) {
2872 PERROR("Failed to get sub-buffer sequence number");
2876 subbuf
->info
.data
.sequence_number
.is_set
= true;
2879 ret
= lttng_ust_ctl_get_stream_id(
2880 stream
->ustream
, &subbuf
->info
.data
.stream_id
);
2882 PERROR("Failed to get stream id");
2886 ret
= lttng_ust_ctl_get_instance_id(stream
->ustream
,
2887 &subbuf
->info
.data
.stream_instance_id
.value
);
2889 /* May not be supported by older LTTng-modules. */
2890 if (ret
!= -ENOTTY
) {
2891 PERROR("Failed to get stream instance id");
2895 subbuf
->info
.data
.stream_instance_id
.is_set
= true;
2901 static int get_next_subbuffer_common(struct lttng_consumer_stream
*stream
,
2902 struct stream_subbuffer
*subbuffer
)
2907 ret
= stream
->read_subbuffer_ops
.extract_subbuffer_info(
2913 ret
= get_current_subbuf_addr(stream
, &addr
);
2918 subbuffer
->buffer
.buffer
= lttng_buffer_view_init(
2919 addr
, 0, subbuffer
->info
.data
.padded_subbuf_size
);
2920 assert(subbuffer
->buffer
.buffer
.data
!= NULL
);
2925 static enum get_next_subbuffer_status
get_next_subbuffer(
2926 struct lttng_consumer_stream
*stream
,
2927 struct stream_subbuffer
*subbuffer
)
2930 enum get_next_subbuffer_status status
;
2932 ret
= lttng_ust_ctl_get_next_subbuf(stream
->ustream
);
2935 status
= GET_NEXT_SUBBUFFER_STATUS_OK
;
2940 * The caller only expects -ENODATA when there is no data to
2941 * read, but the kernel tracer returns -EAGAIN when there is
2942 * currently no data for a non-finalized stream, and -ENODATA
2943 * when there is no data for a finalized stream. Those can be
2944 * combined into a -ENODATA return value.
2946 status
= GET_NEXT_SUBBUFFER_STATUS_NO_DATA
;
2949 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
2953 ret
= get_next_subbuffer_common(stream
, subbuffer
);
2955 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
2962 static enum get_next_subbuffer_status
get_next_subbuffer_metadata(
2963 struct lttng_consumer_stream
*stream
,
2964 struct stream_subbuffer
*subbuffer
)
2971 unsigned long consumed_pos
, produced_pos
;
2972 enum get_next_subbuffer_status status
;
2975 ret
= lttng_ust_ctl_get_next_subbuf(stream
->ustream
);
2977 got_subbuffer
= true;
2979 got_subbuffer
= false;
2980 if (ret
!= -EAGAIN
) {
2982 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
2988 * Determine if the cache is empty and ensure that a sub-buffer
2989 * is made available if the cache is not empty.
2991 if (!got_subbuffer
) {
2992 ret
= commit_one_metadata_packet(stream
);
2993 if (ret
< 0 && ret
!= -ENOBUFS
) {
2994 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
2996 } else if (ret
== 0) {
2997 /* Not an error, the cache is empty. */
2999 status
= GET_NEXT_SUBBUFFER_STATUS_NO_DATA
;
3002 cache_empty
= false;
3005 pthread_mutex_lock(&stream
->chan
->metadata_cache
->lock
);
3006 cache_empty
= stream
->chan
->metadata_cache
->contents
.size
==
3007 stream
->ust_metadata_pushed
;
3008 pthread_mutex_unlock(&stream
->chan
->metadata_cache
->lock
);
3010 } while (!got_subbuffer
);
3012 /* Populate sub-buffer infos and view. */
3013 ret
= get_next_subbuffer_common(stream
, subbuffer
);
3015 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
3019 ret
= lttng_ustconsumer_sample_snapshot_positions(stream
);
3022 * -EAGAIN is not expected since we got a sub-buffer and haven't
3023 * pushed the consumption position yet (on put_next).
3025 PERROR("Failed to take a snapshot of metadata buffer positions");
3026 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
3030 ret
= lttng_ustconsumer_get_consumed_snapshot(stream
, &consumed_pos
);
3032 PERROR("Failed to get metadata consumed position");
3033 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
3037 ret
= lttng_ustconsumer_get_produced_snapshot(stream
, &produced_pos
);
3039 PERROR("Failed to get metadata produced position");
3040 status
= GET_NEXT_SUBBUFFER_STATUS_ERROR
;
3044 /* Last sub-buffer of the ring buffer ? */
3045 buffer_empty
= (consumed_pos
+ stream
->max_sb_size
) == produced_pos
;
3048 * The sessiond registry lock ensures that coherent units of metadata
3049 * are pushed to the consumer daemon at once. Hence, if a sub-buffer is
3050 * acquired, the cache is empty, and it is the only available sub-buffer
3051 * available, it is safe to assume that it is "coherent".
3053 coherent
= got_subbuffer
&& cache_empty
&& buffer_empty
;
3055 LTTNG_OPTIONAL_SET(&subbuffer
->info
.metadata
.coherent
, coherent
);
3056 status
= GET_NEXT_SUBBUFFER_STATUS_OK
;
3061 static int put_next_subbuffer(struct lttng_consumer_stream
*stream
,
3062 struct stream_subbuffer
*subbuffer
)
3064 const int ret
= lttng_ust_ctl_put_next_subbuf(stream
->ustream
);
3070 static int signal_metadata(struct lttng_consumer_stream
*stream
,
3071 struct lttng_consumer_local_data
*ctx
)
3073 ASSERT_LOCKED(stream
->metadata_rdv_lock
);
3074 return pthread_cond_broadcast(&stream
->metadata_rdv
) ? -errno
: 0;
3077 static int lttng_ustconsumer_set_stream_ops(
3078 struct lttng_consumer_stream
*stream
)
3082 stream
->read_subbuffer_ops
.on_wake_up
= consumer_stream_ust_on_wake_up
;
3083 if (stream
->metadata_flag
) {
3084 stream
->read_subbuffer_ops
.get_next_subbuffer
=
3085 get_next_subbuffer_metadata
;
3086 stream
->read_subbuffer_ops
.extract_subbuffer_info
=
3087 extract_metadata_subbuffer_info
;
3088 stream
->read_subbuffer_ops
.reset_metadata
=
3089 metadata_stream_reset_cache_consumed_position
;
3090 if (stream
->chan
->is_live
) {
3091 stream
->read_subbuffer_ops
.on_sleep
= signal_metadata
;
3092 ret
= consumer_stream_enable_metadata_bucketization(
3099 stream
->read_subbuffer_ops
.get_next_subbuffer
=
3101 stream
->read_subbuffer_ops
.extract_subbuffer_info
=
3102 extract_data_subbuffer_info
;
3103 stream
->read_subbuffer_ops
.on_sleep
= notify_if_more_data
;
3104 if (stream
->chan
->is_live
) {
3105 stream
->read_subbuffer_ops
.send_live_beacon
=
3106 consumer_flush_ust_index
;
3110 stream
->read_subbuffer_ops
.put_next_subbuffer
= put_next_subbuffer
;
3116 * Called when a stream is created.
3118 * Return 0 on success or else a negative value.
3120 int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream
*stream
)
3127 * Don't create anything if this is set for streaming or if there is
3128 * no current trace chunk on the parent channel.
3130 if (stream
->net_seq_idx
== (uint64_t) -1ULL && stream
->chan
->monitor
&&
3131 stream
->chan
->trace_chunk
) {
3132 ret
= consumer_stream_create_output_files(stream
, true);
3138 lttng_ustconsumer_set_stream_ops(stream
);
3146 * Check if data is still being extracted from the buffers for a specific
3147 * stream. Consumer data lock MUST be acquired before calling this function
3148 * and the stream lock.
3150 * Return 1 if the traced data are still getting read else 0 meaning that the
3151 * data is available for trace viewer reading.
3153 int lttng_ustconsumer_data_pending(struct lttng_consumer_stream
*stream
)
3158 assert(stream
->ustream
);
3159 ASSERT_LOCKED(stream
->lock
);
3161 DBG("UST consumer checking data pending");
3163 if (stream
->endpoint_status
!= CONSUMER_ENDPOINT_ACTIVE
) {
3168 if (stream
->chan
->type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
3169 uint64_t contiguous
, pushed
;
3171 /* Ease our life a bit. */
3172 pthread_mutex_lock(&stream
->chan
->metadata_cache
->lock
);
3173 contiguous
= stream
->chan
->metadata_cache
->contents
.size
;
3174 pthread_mutex_unlock(&stream
->chan
->metadata_cache
->lock
);
3175 pushed
= stream
->ust_metadata_pushed
;
3178 * We can simply check whether all contiguously available data
3179 * has been pushed to the ring buffer, since the push operation
3180 * is performed within get_next_subbuf(), and because both
3181 * get_next_subbuf() and put_next_subbuf() are issued atomically
3182 * thanks to the stream lock within
3183 * lttng_ustconsumer_read_subbuffer(). This basically means that
3184 * whetnever ust_metadata_pushed is incremented, the associated
3185 * metadata has been consumed from the metadata stream.
3187 DBG("UST consumer metadata pending check: contiguous %" PRIu64
" vs pushed %" PRIu64
,
3188 contiguous
, pushed
);
3189 assert(((int64_t) (contiguous
- pushed
)) >= 0);
3190 if ((contiguous
!= pushed
) ||
3191 (((int64_t) contiguous
- pushed
) > 0 || contiguous
== 0)) {
3192 ret
= 1; /* Data is pending */
3196 ret
= lttng_ust_ctl_get_next_subbuf(stream
->ustream
);
3199 * There is still data so let's put back this
3202 ret
= lttng_ust_ctl_put_subbuf(stream
->ustream
);
3204 ret
= 1; /* Data is pending */
3209 /* Data is NOT pending so ready to be read. */
3217 * Stop a given metadata channel timer if enabled and close the wait fd which
3218 * is the poll pipe of the metadata stream.
3220 * This MUST be called with the metadata channel lock acquired.
3222 void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel
*metadata
)
3227 assert(metadata
->type
== CONSUMER_CHANNEL_TYPE_METADATA
);
3229 DBG("Closing metadata channel key %" PRIu64
, metadata
->key
);
3231 if (metadata
->switch_timer_enabled
== 1) {
3232 consumer_timer_switch_stop(metadata
);
3235 if (!metadata
->metadata_stream
) {
3240 * Closing write side so the thread monitoring the stream wakes up if any
3241 * and clean the metadata stream.
3243 if (metadata
->metadata_stream
->ust_metadata_poll_pipe
[1] >= 0) {
3244 ret
= close(metadata
->metadata_stream
->ust_metadata_poll_pipe
[1]);
3246 PERROR("closing metadata pipe write side");
3248 metadata
->metadata_stream
->ust_metadata_poll_pipe
[1] = -1;
3256 * Close every metadata stream wait fd of the metadata hash table. This
3257 * function MUST be used very carefully so not to run into a race between the
3258 * metadata thread handling streams and this function closing their wait fd.
3260 * For UST, this is used when the session daemon hangs up. Its the metadata
3261 * producer so calling this is safe because we are assured that no state change
3262 * can occur in the metadata thread for the streams in the hash table.
3264 void lttng_ustconsumer_close_all_metadata(struct lttng_ht
*metadata_ht
)
3266 struct lttng_ht_iter iter
;
3267 struct lttng_consumer_stream
*stream
;
3269 assert(metadata_ht
);
3270 assert(metadata_ht
->ht
);
3272 DBG("UST consumer closing all metadata streams");
3275 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
,
3278 health_code_update();
3280 pthread_mutex_lock(&stream
->chan
->lock
);
3281 lttng_ustconsumer_close_metadata(stream
->chan
);
3282 pthread_mutex_unlock(&stream
->chan
->lock
);
3288 void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream
*stream
)
3292 ret
= lttng_ust_ctl_stream_close_wakeup_fd(stream
->ustream
);
3294 ERR("Unable to close wakeup fd");
3299 * Please refer to consumer-timer.c before adding any lock within this
3300 * function or any of its callees. Timers have a very strict locking
3301 * semantic with respect to teardown. Failure to respect this semantic
3302 * introduces deadlocks.
3304 * DON'T hold the metadata lock when calling this function, else this
3305 * can cause deadlock involving consumer awaiting for metadata to be
3306 * pushed out due to concurrent interaction with the session daemon.
3308 int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data
*ctx
,
3309 struct lttng_consumer_channel
*channel
, int timer
, int wait
)
3311 struct lttcomm_metadata_request_msg request
;
3312 struct lttcomm_consumer_msg msg
;
3313 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
3314 uint64_t len
, key
, offset
, version
;
3318 assert(channel
->metadata_cache
);
3320 memset(&request
, 0, sizeof(request
));
3322 /* send the metadata request to sessiond */
3323 switch (the_consumer_data
.type
) {
3324 case LTTNG_CONSUMER64_UST
:
3325 request
.bits_per_long
= 64;
3327 case LTTNG_CONSUMER32_UST
:
3328 request
.bits_per_long
= 32;
3331 request
.bits_per_long
= 0;
3335 request
.session_id
= channel
->session_id
;
3336 request
.session_id_per_pid
= channel
->session_id_per_pid
;
3338 * Request the application UID here so the metadata of that application can
3339 * be sent back. The channel UID corresponds to the user UID of the session
3340 * used for the rights on the stream file(s).
3342 request
.uid
= channel
->ust_app_uid
;
3343 request
.key
= channel
->key
;
3345 DBG("Sending metadata request to sessiond, session id %" PRIu64
3346 ", per-pid %" PRIu64
", app UID %u and channel key %" PRIu64
,
3347 request
.session_id
, request
.session_id_per_pid
, request
.uid
,
3350 pthread_mutex_lock(&ctx
->metadata_socket_lock
);
3352 health_code_update();
3354 ret
= lttcomm_send_unix_sock(ctx
->consumer_metadata_socket
, &request
,
3357 ERR("Asking metadata to sessiond");
3361 health_code_update();
3363 /* Receive the metadata from sessiond */
3364 ret
= lttcomm_recv_unix_sock(ctx
->consumer_metadata_socket
, &msg
,
3366 if (ret
!= sizeof(msg
)) {
3367 DBG("Consumer received unexpected message size %d (expects %zu)",
3369 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_ERROR_RECV_CMD
);
3371 * The ret value might 0 meaning an orderly shutdown but this is ok
3372 * since the caller handles this.
3377 health_code_update();
3379 if (msg
.cmd_type
== LTTNG_ERR_UND
) {
3380 /* No registry found */
3381 (void) consumer_send_status_msg(ctx
->consumer_metadata_socket
,
3385 } else if (msg
.cmd_type
!= LTTNG_CONSUMER_PUSH_METADATA
) {
3386 ERR("Unexpected cmd_type received %d", msg
.cmd_type
);
3391 len
= msg
.u
.push_metadata
.len
;
3392 key
= msg
.u
.push_metadata
.key
;
3393 offset
= msg
.u
.push_metadata
.target_offset
;
3394 version
= msg
.u
.push_metadata
.version
;
3396 assert(key
== channel
->key
);
3398 DBG("No new metadata to receive for key %" PRIu64
, key
);
3401 health_code_update();
3403 /* Tell session daemon we are ready to receive the metadata. */
3404 ret
= consumer_send_status_msg(ctx
->consumer_metadata_socket
,
3405 LTTCOMM_CONSUMERD_SUCCESS
);
3406 if (ret
< 0 || len
== 0) {
3408 * Somehow, the session daemon is not responding anymore or there is
3409 * nothing to receive.
3414 health_code_update();
3416 ret
= lttng_ustconsumer_recv_metadata(ctx
->consumer_metadata_socket
,
3417 key
, offset
, len
, version
, channel
, timer
, wait
);
3420 * Only send the status msg if the sessiond is alive meaning a positive
3423 (void) consumer_send_status_msg(ctx
->consumer_metadata_socket
, ret
);
3428 health_code_update();
3430 pthread_mutex_unlock(&ctx
->metadata_socket_lock
);
3435 * Return the ustctl call for the get stream id.
3437 int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream
*stream
,
3438 uint64_t *stream_id
)
3443 return lttng_ust_ctl_get_stream_id(stream
->ustream
, stream_id
);
3446 void lttng_ustconsumer_sigbus_handle(void *addr
)
3448 lttng_ust_ctl_sigbus_handle(addr
);