2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <lttng/ust-ctl.h>
27 #include <sys/socket.h>
29 #include <sys/types.h>
32 #include <urcu/list.h>
35 #include <bin/lttng-consumerd/health-consumerd.h>
36 #include <common/common.h>
37 #include <common/sessiond-comm/sessiond-comm.h>
38 #include <common/relayd/relayd.h>
39 #include <common/compat/fcntl.h>
40 #include <common/consumer-metadata-cache.h>
41 #include <common/consumer-stream.h>
42 #include <common/consumer-timer.h>
43 #include <common/utils.h>
44 #include <common/index/index.h>
46 #include "ust-consumer.h"
48 extern struct lttng_consumer_global_data consumer_data
;
49 extern int consumer_poll_timeout
;
50 extern volatile int consumer_quit
;
53 * Free channel object and all streams associated with it. This MUST be used
54 * only and only if the channel has _NEVER_ been added to the global channel
57 static void destroy_channel(struct lttng_consumer_channel
*channel
)
59 struct lttng_consumer_stream
*stream
, *stmp
;
63 DBG("UST consumer cleaning stream list");
65 cds_list_for_each_entry_safe(stream
, stmp
, &channel
->streams
.head
,
70 cds_list_del(&stream
->send_node
);
71 ustctl_destroy_stream(stream
->ustream
);
76 * If a channel is available meaning that was created before the streams
80 lttng_ustconsumer_del_channel(channel
);
86 * Add channel to internal consumer state.
88 * Returns 0 on success or else a negative value.
90 static int add_channel(struct lttng_consumer_channel
*channel
,
91 struct lttng_consumer_local_data
*ctx
)
98 if (ctx
->on_recv_channel
!= NULL
) {
99 ret
= ctx
->on_recv_channel(channel
);
101 ret
= consumer_add_channel(channel
, ctx
);
102 } else if (ret
< 0) {
103 /* Most likely an ENOMEM. */
104 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_OUTFD_ERROR
);
108 ret
= consumer_add_channel(channel
, ctx
);
111 DBG("UST consumer channel added (key: %" PRIu64
")", channel
->key
);
118 * Allocate and return a consumer channel object.
120 static struct lttng_consumer_channel
*allocate_channel(uint64_t session_id
,
121 const char *pathname
, const char *name
, uid_t uid
, gid_t gid
,
122 uint64_t relayd_id
, uint64_t key
, enum lttng_event_output output
,
123 uint64_t tracefile_size
, uint64_t tracefile_count
,
124 uint64_t session_id_per_pid
, unsigned int monitor
,
125 unsigned int live_timer_interval
)
130 return consumer_allocate_channel(key
, session_id
, pathname
, name
, uid
,
131 gid
, relayd_id
, output
, tracefile_size
,
132 tracefile_count
, session_id_per_pid
, monitor
, live_timer_interval
);
136 * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the
137 * error value if applicable is set in it else it is kept untouched.
139 * Return NULL on error else the newly allocated stream object.
141 static struct lttng_consumer_stream
*allocate_stream(int cpu
, int key
,
142 struct lttng_consumer_channel
*channel
,
143 struct lttng_consumer_local_data
*ctx
, int *_alloc_ret
)
146 struct lttng_consumer_stream
*stream
= NULL
;
151 stream
= consumer_allocate_stream(channel
->key
,
153 LTTNG_CONSUMER_ACTIVE_STREAM
,
163 if (stream
== NULL
) {
167 * We could not find the channel. Can happen if cpu hotplug
168 * happens while tearing down.
170 DBG3("Could not find channel");
175 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_OUTFD_ERROR
);
181 stream
->chan
= channel
;
185 *_alloc_ret
= alloc_ret
;
191 * Send the given stream pointer to the corresponding thread.
193 * Returns 0 on success else a negative value.
195 static int send_stream_to_thread(struct lttng_consumer_stream
*stream
,
196 struct lttng_consumer_local_data
*ctx
)
199 struct lttng_pipe
*stream_pipe
;
201 /* Get the right pipe where the stream will be sent. */
202 if (stream
->metadata_flag
) {
203 ret
= consumer_add_metadata_stream(stream
);
205 ERR("Consumer add metadata stream %" PRIu64
" failed.",
209 stream_pipe
= ctx
->consumer_metadata_pipe
;
211 ret
= consumer_add_data_stream(stream
);
213 ERR("Consumer add stream %" PRIu64
" failed.",
217 stream_pipe
= ctx
->consumer_data_pipe
;
221 * From this point on, the stream's ownership has been moved away from
222 * the channel and becomes globally visible.
224 stream
->globally_visible
= 1;
226 ret
= lttng_pipe_write(stream_pipe
, &stream
, sizeof(stream
));
228 ERR("Consumer write %s stream to pipe %d",
229 stream
->metadata_flag
? "metadata" : "data",
230 lttng_pipe_get_writefd(stream_pipe
));
231 if (stream
->metadata_flag
) {
232 consumer_del_stream_for_metadata(stream
);
234 consumer_del_stream_for_data(stream
);
242 * Create streams for the given channel using liblttng-ust-ctl.
244 * Return 0 on success else a negative value.
246 static int create_ust_streams(struct lttng_consumer_channel
*channel
,
247 struct lttng_consumer_local_data
*ctx
)
250 struct ustctl_consumer_stream
*ustream
;
251 struct lttng_consumer_stream
*stream
;
257 * While a stream is available from ustctl. When NULL is returned, we've
258 * reached the end of the possible stream for the channel.
260 while ((ustream
= ustctl_create_stream(channel
->uchan
, cpu
))) {
262 int ust_metadata_pipe
[2];
264 health_code_update();
266 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
&& channel
->monitor
) {
267 ret
= utils_create_pipe_cloexec_nonblock(ust_metadata_pipe
);
269 ERR("Create ust metadata poll pipe");
272 wait_fd
= ust_metadata_pipe
[0];
274 wait_fd
= ustctl_stream_get_wait_fd(ustream
);
277 /* Allocate consumer stream object. */
278 stream
= allocate_stream(cpu
, wait_fd
, channel
, ctx
, &ret
);
282 stream
->ustream
= ustream
;
284 * Store it so we can save multiple function calls afterwards since
285 * this value is used heavily in the stream threads. This is UST
286 * specific so this is why it's done after allocation.
288 stream
->wait_fd
= wait_fd
;
291 * Increment channel refcount since the channel reference has now been
292 * assigned in the allocation process above.
294 if (stream
->chan
->monitor
) {
295 uatomic_inc(&stream
->chan
->refcount
);
299 * Order is important this is why a list is used. On error, the caller
300 * should clean this list.
302 cds_list_add_tail(&stream
->send_node
, &channel
->streams
.head
);
304 ret
= ustctl_get_max_subbuf_size(stream
->ustream
,
305 &stream
->max_sb_size
);
307 ERR("ustctl_get_max_subbuf_size failed for stream %s",
312 /* Do actions once stream has been received. */
313 if (ctx
->on_recv_stream
) {
314 ret
= ctx
->on_recv_stream(stream
);
320 DBG("UST consumer add stream %s (key: %" PRIu64
") with relayd id %" PRIu64
,
321 stream
->name
, stream
->key
, stream
->relayd_stream_id
);
323 /* Set next CPU stream. */
324 channel
->streams
.count
= ++cpu
;
326 /* Keep stream reference when creating metadata. */
327 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
328 channel
->metadata_stream
= stream
;
329 stream
->ust_metadata_poll_pipe
[0] = ust_metadata_pipe
[0];
330 stream
->ust_metadata_poll_pipe
[1] = ust_metadata_pipe
[1];
342 * Create an UST channel with the given attributes and send it to the session
343 * daemon using the ust ctl API.
345 * Return 0 on success or else a negative value.
347 static int create_ust_channel(struct ustctl_consumer_channel_attr
*attr
,
348 struct ustctl_consumer_channel
**chanp
)
351 struct ustctl_consumer_channel
*channel
;
356 DBG3("Creating channel to ustctl with attr: [overwrite: %d, "
357 "subbuf_size: %" PRIu64
", num_subbuf: %" PRIu64
", "
358 "switch_timer_interval: %u, read_timer_interval: %u, "
359 "output: %d, type: %d", attr
->overwrite
, attr
->subbuf_size
,
360 attr
->num_subbuf
, attr
->switch_timer_interval
,
361 attr
->read_timer_interval
, attr
->output
, attr
->type
);
363 channel
= ustctl_create_channel(attr
);
378 * Send a single given stream to the session daemon using the sock.
380 * Return 0 on success else a negative value.
382 static int send_sessiond_stream(int sock
, struct lttng_consumer_stream
*stream
)
389 DBG("UST consumer sending stream %" PRIu64
" to sessiond", stream
->key
);
391 /* Send stream to session daemon. */
392 ret
= ustctl_send_stream_to_sessiond(sock
, stream
->ustream
);
402 * Send channel to sessiond.
404 * Return 0 on success or else a negative value.
406 static int send_sessiond_channel(int sock
,
407 struct lttng_consumer_channel
*channel
,
408 struct lttng_consumer_local_data
*ctx
, int *relayd_error
)
410 int ret
, ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
411 struct lttng_consumer_stream
*stream
;
417 DBG("UST consumer sending channel %s to sessiond", channel
->name
);
419 if (channel
->relayd_id
!= (uint64_t) -1ULL) {
420 cds_list_for_each_entry(stream
, &channel
->streams
.head
, send_node
) {
422 health_code_update();
424 /* Try to send the stream to the relayd if one is available. */
425 ret
= consumer_send_relayd_stream(stream
, stream
->chan
->pathname
);
428 * Flag that the relayd was the problem here probably due to a
429 * communicaton error on the socket.
434 ret_code
= LTTNG_ERR_RELAYD_CONNECT_FAIL
;
439 /* Inform sessiond that we are about to send channel and streams. */
440 ret
= consumer_send_status_msg(sock
, ret_code
);
441 if (ret
< 0 || ret_code
!= LTTCOMM_CONSUMERD_SUCCESS
) {
443 * Either the session daemon is not responding or the relayd died so we
449 /* Send channel to sessiond. */
450 ret
= ustctl_send_channel_to_sessiond(sock
, channel
->uchan
);
455 ret
= ustctl_channel_close_wakeup_fd(channel
->uchan
);
460 /* The channel was sent successfully to the sessiond at this point. */
461 cds_list_for_each_entry(stream
, &channel
->streams
.head
, send_node
) {
463 health_code_update();
465 /* Send stream to session daemon. */
466 ret
= send_sessiond_stream(sock
, stream
);
472 /* Tell sessiond there is no more stream. */
473 ret
= ustctl_send_stream_to_sessiond(sock
, NULL
);
478 DBG("UST consumer NULL stream sent to sessiond");
483 if (ret_code
!= LTTCOMM_CONSUMERD_SUCCESS
) {
490 * Creates a channel and streams and add the channel it to the channel internal
491 * state. The created stream must ONLY be sent once the GET_CHANNEL command is
494 * Return 0 on success or else, a negative value is returned and the channel
495 * MUST be destroyed by consumer_del_channel().
497 static int ask_channel(struct lttng_consumer_local_data
*ctx
, int sock
,
498 struct lttng_consumer_channel
*channel
,
499 struct ustctl_consumer_channel_attr
*attr
)
508 * This value is still used by the kernel consumer since for the kernel,
509 * the stream ownership is not IN the consumer so we need to have the
510 * number of left stream that needs to be initialized so we can know when
511 * to delete the channel (see consumer.c).
513 * As for the user space tracer now, the consumer creates and sends the
514 * stream to the session daemon which only sends them to the application
515 * once every stream of a channel is received making this value useless
516 * because we they will be added to the poll thread before the application
517 * receives them. This ensures that a stream can not hang up during
518 * initilization of a channel.
520 channel
->nb_init_stream_left
= 0;
522 /* The reply msg status is handled in the following call. */
523 ret
= create_ust_channel(attr
, &channel
->uchan
);
528 channel
->wait_fd
= ustctl_channel_get_wait_fd(channel
->uchan
);
531 * For the snapshots (no monitor), we create the metadata streams
532 * on demand, not during the channel creation.
534 if (channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
&& !channel
->monitor
) {
539 /* Open all streams for this channel. */
540 ret
= create_ust_streams(channel
, ctx
);
550 * Send all stream of a channel to the right thread handling it.
552 * On error, return a negative value else 0 on success.
554 static int send_streams_to_thread(struct lttng_consumer_channel
*channel
,
555 struct lttng_consumer_local_data
*ctx
)
558 struct lttng_consumer_stream
*stream
, *stmp
;
563 /* Send streams to the corresponding thread. */
564 cds_list_for_each_entry_safe(stream
, stmp
, &channel
->streams
.head
,
567 health_code_update();
569 /* Sending the stream to the thread. */
570 ret
= send_stream_to_thread(stream
, ctx
);
573 * If we are unable to send the stream to the thread, there is
574 * a big problem so just stop everything.
576 /* Remove node from the channel stream list. */
577 cds_list_del(&stream
->send_node
);
581 /* Remove node from the channel stream list. */
582 cds_list_del(&stream
->send_node
);
591 * Flush channel's streams using the given key to retrieve the channel.
593 * Return 0 on success else an LTTng error code.
595 static int flush_channel(uint64_t chan_key
)
598 struct lttng_consumer_channel
*channel
;
599 struct lttng_consumer_stream
*stream
;
601 struct lttng_ht_iter iter
;
603 DBG("UST consumer flush channel key %" PRIu64
, chan_key
);
606 channel
= consumer_find_channel(chan_key
);
608 ERR("UST consumer flush channel %" PRIu64
" not found", chan_key
);
609 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
613 ht
= consumer_data
.stream_per_chan_id_ht
;
615 /* For each stream of the channel id, flush it. */
616 cds_lfht_for_each_entry_duplicate(ht
->ht
,
617 ht
->hash_fct(&channel
->key
, lttng_ht_seed
), ht
->match_fct
,
618 &channel
->key
, &iter
.iter
, stream
, node_channel_id
.node
) {
620 health_code_update();
622 ustctl_flush_buffer(stream
->ustream
, 1);
629 * Close metadata stream wakeup_fd using the given key to retrieve the channel.
630 * RCU read side lock MUST be acquired before calling this function.
632 * NOTE: This function does NOT take any channel nor stream lock.
634 * Return 0 on success else LTTng error code.
636 static int _close_metadata(struct lttng_consumer_channel
*channel
)
638 int ret
= LTTCOMM_CONSUMERD_SUCCESS
;
641 assert(channel
->type
== CONSUMER_CHANNEL_TYPE_METADATA
);
643 if (channel
->switch_timer_enabled
== 1) {
644 DBG("Deleting timer on metadata channel");
645 consumer_timer_switch_stop(channel
);
648 if (channel
->metadata_stream
) {
649 ret
= ustctl_stream_close_wakeup_fd(channel
->metadata_stream
->ustream
);
651 ERR("UST consumer unable to close fd of metadata (ret: %d)", ret
);
652 ret
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
655 if (channel
->monitor
) {
656 /* Close the read-side in consumer_del_metadata_stream */
657 ret
= close(channel
->metadata_stream
->ust_metadata_poll_pipe
[1]);
659 PERROR("Close UST metadata write-side poll pipe");
660 ret
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
669 * Close metadata stream wakeup_fd using the given key to retrieve the channel.
670 * RCU read side lock MUST be acquired before calling this function.
672 * Return 0 on success else an LTTng error code.
674 static int close_metadata(uint64_t chan_key
)
677 struct lttng_consumer_channel
*channel
;
679 DBG("UST consumer close metadata key %" PRIu64
, chan_key
);
681 channel
= consumer_find_channel(chan_key
);
684 * This is possible if the metadata thread has issue a delete because
685 * the endpoint point of the stream hung up. There is no way the
686 * session daemon can know about it thus use a DBG instead of an actual
689 DBG("UST consumer close metadata %" PRIu64
" not found", chan_key
);
690 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
694 pthread_mutex_lock(&consumer_data
.lock
);
695 pthread_mutex_lock(&channel
->lock
);
697 if (cds_lfht_is_node_deleted(&channel
->node
.node
)) {
701 ret
= _close_metadata(channel
);
704 pthread_mutex_unlock(&channel
->lock
);
705 pthread_mutex_unlock(&consumer_data
.lock
);
711 * RCU read side lock MUST be acquired before calling this function.
713 * Return 0 on success else an LTTng error code.
715 static int setup_metadata(struct lttng_consumer_local_data
*ctx
, uint64_t key
)
718 struct lttng_consumer_channel
*metadata
;
720 DBG("UST consumer setup metadata key %" PRIu64
, key
);
722 metadata
= consumer_find_channel(key
);
724 ERR("UST consumer push metadata %" PRIu64
" not found", key
);
725 ret
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
730 * In no monitor mode, the metadata channel has no stream(s) so skip the
731 * ownership transfer to the metadata thread.
733 if (!metadata
->monitor
) {
734 DBG("Metadata channel in no monitor");
740 * Send metadata stream to relayd if one available. Availability is
741 * known if the stream is still in the list of the channel.
743 if (cds_list_empty(&metadata
->streams
.head
)) {
744 ERR("Metadata channel key %" PRIu64
", no stream available.", key
);
745 ret
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
746 goto error_no_stream
;
749 /* Send metadata stream to relayd if needed. */
750 if (metadata
->metadata_stream
->net_seq_idx
!= (uint64_t) -1ULL) {
751 ret
= consumer_send_relayd_stream(metadata
->metadata_stream
,
754 ret
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
759 ret
= send_streams_to_thread(metadata
, ctx
);
762 * If we are unable to send the stream to the thread, there is
763 * a big problem so just stop everything.
765 ret
= LTTCOMM_CONSUMERD_FATAL
;
768 /* List MUST be empty after or else it could be reused. */
769 assert(cds_list_empty(&metadata
->streams
.head
));
776 * Delete metadata channel on error. At this point, the metadata stream can
777 * NOT be monitored by the metadata thread thus having the guarantee that
778 * the stream is still in the local stream list of the channel. This call
779 * will make sure to clean that list.
781 cds_list_del(&metadata
->metadata_stream
->send_node
);
782 consumer_stream_destroy(metadata
->metadata_stream
, NULL
);
789 * Snapshot the whole metadata.
791 * Returns 0 on success, < 0 on error
793 static int snapshot_metadata(uint64_t key
, char *path
, uint64_t relayd_id
,
794 struct lttng_consumer_local_data
*ctx
)
797 struct lttng_consumer_channel
*metadata_channel
;
798 struct lttng_consumer_stream
*metadata_stream
;
803 DBG("UST consumer snapshot metadata with key %" PRIu64
" at path %s",
808 metadata_channel
= consumer_find_channel(key
);
809 if (!metadata_channel
) {
810 ERR("UST snapshot metadata channel not found for key %" PRIu64
,
815 assert(!metadata_channel
->monitor
);
817 health_code_update();
820 * Ask the sessiond if we have new metadata waiting and update the
821 * consumer metadata cache.
823 ret
= lttng_ustconsumer_request_metadata(ctx
, metadata_channel
, 0, 1);
828 health_code_update();
831 * The metadata stream is NOT created in no monitor mode when the channel
832 * is created on a sessiond ask channel command.
834 ret
= create_ust_streams(metadata_channel
, ctx
);
839 metadata_stream
= metadata_channel
->metadata_stream
;
840 assert(metadata_stream
);
842 if (relayd_id
!= (uint64_t) -1ULL) {
843 metadata_stream
->net_seq_idx
= relayd_id
;
844 ret
= consumer_send_relayd_stream(metadata_stream
, path
);
849 ret
= utils_create_stream_file(path
, metadata_stream
->name
,
850 metadata_stream
->chan
->tracefile_size
,
851 metadata_stream
->tracefile_count_current
,
852 metadata_stream
->uid
, metadata_stream
->gid
, NULL
);
856 metadata_stream
->out_fd
= ret
;
857 metadata_stream
->tracefile_size_current
= 0;
861 health_code_update();
863 ret
= lttng_consumer_read_subbuffer(metadata_stream
, ctx
);
871 * Clean up the stream completly because the next snapshot will use a new
874 cds_list_del(&metadata_stream
->send_node
);
875 consumer_stream_destroy(metadata_stream
, NULL
);
876 metadata_channel
->metadata_stream
= NULL
;
884 * Take a snapshot of all the stream of a channel.
886 * Returns 0 on success, < 0 on error
888 static int snapshot_channel(uint64_t key
, char *path
, uint64_t relayd_id
,
889 uint64_t max_stream_size
, struct lttng_consumer_local_data
*ctx
)
892 unsigned use_relayd
= 0;
893 unsigned long consumed_pos
, produced_pos
;
894 struct lttng_consumer_channel
*channel
;
895 struct lttng_consumer_stream
*stream
;
902 if (relayd_id
!= (uint64_t) -1ULL) {
906 channel
= consumer_find_channel(key
);
908 ERR("UST snapshot channel not found for key %" PRIu64
, key
);
912 assert(!channel
->monitor
);
913 DBG("UST consumer snapshot channel %" PRIu64
, key
);
915 cds_list_for_each_entry(stream
, &channel
->streams
.head
, send_node
) {
917 health_code_update();
919 /* Lock stream because we are about to change its state. */
920 pthread_mutex_lock(&stream
->lock
);
921 stream
->net_seq_idx
= relayd_id
;
924 ret
= consumer_send_relayd_stream(stream
, path
);
929 ret
= utils_create_stream_file(path
, stream
->name
,
930 stream
->chan
->tracefile_size
,
931 stream
->tracefile_count_current
,
932 stream
->uid
, stream
->gid
, NULL
);
936 stream
->out_fd
= ret
;
937 stream
->tracefile_size_current
= 0;
939 DBG("UST consumer snapshot stream %s/%s (%" PRIu64
")", path
,
940 stream
->name
, stream
->key
);
943 ustctl_flush_buffer(stream
->ustream
, 1);
945 ret
= lttng_ustconsumer_take_snapshot(stream
);
947 ERR("Taking UST snapshot");
951 ret
= lttng_ustconsumer_get_produced_snapshot(stream
, &produced_pos
);
953 ERR("Produced UST snapshot position");
957 ret
= lttng_ustconsumer_get_consumed_snapshot(stream
, &consumed_pos
);
959 ERR("Consumerd UST snapshot position");
964 * The original value is sent back if max stream size is larger than
965 * the possible size of the snapshot. Also, we asume that the session
966 * daemon should never send a maximum stream size that is lower than
969 consumed_pos
= consumer_get_consumed_maxsize(consumed_pos
,
970 produced_pos
, max_stream_size
);
972 while (consumed_pos
< produced_pos
) {
974 unsigned long len
, padded_len
;
976 health_code_update();
978 DBG("UST consumer taking snapshot at pos %lu", consumed_pos
);
980 ret
= ustctl_get_subbuf(stream
->ustream
, &consumed_pos
);
982 if (ret
!= -EAGAIN
) {
983 PERROR("ustctl_get_subbuf snapshot");
984 goto error_close_stream
;
986 DBG("UST consumer get subbuf failed. Skipping it.");
987 consumed_pos
+= stream
->max_sb_size
;
991 ret
= ustctl_get_subbuf_size(stream
->ustream
, &len
);
993 ERR("Snapshot ustctl_get_subbuf_size");
994 goto error_put_subbuf
;
997 ret
= ustctl_get_padded_subbuf_size(stream
->ustream
, &padded_len
);
999 ERR("Snapshot ustctl_get_padded_subbuf_size");
1000 goto error_put_subbuf
;
1003 read_len
= lttng_consumer_on_read_subbuffer_mmap(ctx
, stream
, len
,
1004 padded_len
- len
, NULL
);
1006 if (read_len
!= len
) {
1008 goto error_put_subbuf
;
1011 if (read_len
!= padded_len
) {
1013 goto error_put_subbuf
;
1017 ret
= ustctl_put_subbuf(stream
->ustream
);
1019 ERR("Snapshot ustctl_put_subbuf");
1020 goto error_close_stream
;
1022 consumed_pos
+= stream
->max_sb_size
;
1025 /* Simply close the stream so we can use it on the next snapshot. */
1026 consumer_stream_close(stream
);
1027 pthread_mutex_unlock(&stream
->lock
);
1034 if (ustctl_put_subbuf(stream
->ustream
) < 0) {
1035 ERR("Snapshot ustctl_put_subbuf");
1038 consumer_stream_close(stream
);
1040 pthread_mutex_unlock(&stream
->lock
);
1047 * Receive the metadata updates from the sessiond.
1049 int lttng_ustconsumer_recv_metadata(int sock
, uint64_t key
, uint64_t offset
,
1050 uint64_t len
, struct lttng_consumer_channel
*channel
,
1051 int timer
, int wait
)
1053 int ret
, ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
1056 DBG("UST consumer push metadata key %" PRIu64
" of len %" PRIu64
, key
, len
);
1058 metadata_str
= zmalloc(len
* sizeof(char));
1059 if (!metadata_str
) {
1060 PERROR("zmalloc metadata string");
1061 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
1065 health_code_update();
1067 /* Receive metadata string. */
1068 ret
= lttcomm_recv_unix_sock(sock
, metadata_str
, len
);
1070 /* Session daemon is dead so return gracefully. */
1075 health_code_update();
1077 pthread_mutex_lock(&channel
->metadata_cache
->lock
);
1078 ret
= consumer_metadata_cache_write(channel
, offset
, len
, metadata_str
);
1080 /* Unable to handle metadata. Notify session daemon. */
1081 ret_code
= LTTCOMM_CONSUMERD_ERROR_METADATA
;
1083 * Skip metadata flush on write error since the offset and len might
1084 * not have been updated which could create an infinite loop below when
1085 * waiting for the metadata cache to be flushed.
1087 pthread_mutex_unlock(&channel
->metadata_cache
->lock
);
1090 pthread_mutex_unlock(&channel
->metadata_cache
->lock
);
1095 while (consumer_metadata_cache_flushed(channel
, offset
+ len
, timer
)) {
1096 DBG("Waiting for metadata to be flushed");
1098 health_code_update();
1100 usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME
);
1110 * Receive command from session daemon and process it.
1112 * Return 1 on success else a negative value or 0.
1114 int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
1115 int sock
, struct pollfd
*consumer_sockpoll
)
1118 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
1119 struct lttcomm_consumer_msg msg
;
1120 struct lttng_consumer_channel
*channel
= NULL
;
1122 health_code_update();
1124 ret
= lttcomm_recv_unix_sock(sock
, &msg
, sizeof(msg
));
1125 if (ret
!= sizeof(msg
)) {
1126 DBG("Consumer received unexpected message size %zd (expects %zu)",
1129 * The ret value might 0 meaning an orderly shutdown but this is ok
1130 * since the caller handles this.
1133 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_ERROR_RECV_CMD
);
1139 health_code_update();
1141 if (msg
.cmd_type
== LTTNG_CONSUMER_STOP
) {
1143 * Notify the session daemon that the command is completed.
1145 * On transport layer error, the function call will print an error
1146 * message so handling the returned code is a bit useless since we
1147 * return an error code anyway.
1149 (void) consumer_send_status_msg(sock
, ret_code
);
1153 health_code_update();
1155 /* relayd needs RCU read-side lock */
1158 switch (msg
.cmd_type
) {
1159 case LTTNG_CONSUMER_ADD_RELAYD_SOCKET
:
1161 /* Session daemon status message are handled in the following call. */
1162 ret
= consumer_add_relayd_socket(msg
.u
.relayd_sock
.net_index
,
1163 msg
.u
.relayd_sock
.type
, ctx
, sock
, consumer_sockpoll
,
1164 &msg
.u
.relayd_sock
.sock
, msg
.u
.relayd_sock
.session_id
,
1165 msg
.u
.relayd_sock
.relayd_session_id
);
1168 case LTTNG_CONSUMER_DESTROY_RELAYD
:
1170 uint64_t index
= msg
.u
.destroy_relayd
.net_seq_idx
;
1171 struct consumer_relayd_sock_pair
*relayd
;
1173 DBG("UST consumer destroying relayd %" PRIu64
, index
);
1175 /* Get relayd reference if exists. */
1176 relayd
= consumer_find_relayd(index
);
1177 if (relayd
== NULL
) {
1178 DBG("Unable to find relayd %" PRIu64
, index
);
1179 ret_code
= LTTNG_ERR_NO_CONSUMER
;
1183 * Each relayd socket pair has a refcount of stream attached to it
1184 * which tells if the relayd is still active or not depending on the
1187 * This will set the destroy flag of the relayd object and destroy it
1188 * if the refcount reaches zero when called.
1190 * The destroy can happen either here or when a stream fd hangs up.
1193 consumer_flag_relayd_for_destroy(relayd
);
1196 goto end_msg_sessiond
;
1198 case LTTNG_CONSUMER_UPDATE_STREAM
:
1203 case LTTNG_CONSUMER_DATA_PENDING
:
1205 int ret
, is_data_pending
;
1206 uint64_t id
= msg
.u
.data_pending
.session_id
;
1208 DBG("UST consumer data pending command for id %" PRIu64
, id
);
1210 is_data_pending
= consumer_data_pending(id
);
1212 /* Send back returned value to session daemon */
1213 ret
= lttcomm_send_unix_sock(sock
, &is_data_pending
,
1214 sizeof(is_data_pending
));
1216 DBG("Error when sending the data pending ret code: %d", ret
);
1221 * No need to send back a status message since the data pending
1222 * returned value is the response.
1226 case LTTNG_CONSUMER_ASK_CHANNEL_CREATION
:
1229 struct ustctl_consumer_channel_attr attr
;
1231 /* Create a plain object and reserve a channel key. */
1232 channel
= allocate_channel(msg
.u
.ask_channel
.session_id
,
1233 msg
.u
.ask_channel
.pathname
, msg
.u
.ask_channel
.name
,
1234 msg
.u
.ask_channel
.uid
, msg
.u
.ask_channel
.gid
,
1235 msg
.u
.ask_channel
.relayd_id
, msg
.u
.ask_channel
.key
,
1236 (enum lttng_event_output
) msg
.u
.ask_channel
.output
,
1237 msg
.u
.ask_channel
.tracefile_size
,
1238 msg
.u
.ask_channel
.tracefile_count
,
1239 msg
.u
.ask_channel
.session_id_per_pid
,
1240 msg
.u
.ask_channel
.monitor
,
1241 msg
.u
.ask_channel
.live_timer_interval
);
1243 goto end_channel_error
;
1247 * Assign UST application UID to the channel. This value is ignored for
1248 * per PID buffers. This is specific to UST thus setting this after the
1251 channel
->ust_app_uid
= msg
.u
.ask_channel
.ust_app_uid
;
1253 /* Build channel attributes from received message. */
1254 attr
.subbuf_size
= msg
.u
.ask_channel
.subbuf_size
;
1255 attr
.num_subbuf
= msg
.u
.ask_channel
.num_subbuf
;
1256 attr
.overwrite
= msg
.u
.ask_channel
.overwrite
;
1257 attr
.switch_timer_interval
= msg
.u
.ask_channel
.switch_timer_interval
;
1258 attr
.read_timer_interval
= msg
.u
.ask_channel
.read_timer_interval
;
1259 attr
.chan_id
= msg
.u
.ask_channel
.chan_id
;
1260 memcpy(attr
.uuid
, msg
.u
.ask_channel
.uuid
, sizeof(attr
.uuid
));
1262 /* Match channel buffer type to the UST abi. */
1263 switch (msg
.u
.ask_channel
.output
) {
1264 case LTTNG_EVENT_MMAP
:
1266 attr
.output
= LTTNG_UST_MMAP
;
1270 /* Translate and save channel type. */
1271 switch (msg
.u
.ask_channel
.type
) {
1272 case LTTNG_UST_CHAN_PER_CPU
:
1273 channel
->type
= CONSUMER_CHANNEL_TYPE_DATA
;
1274 attr
.type
= LTTNG_UST_CHAN_PER_CPU
;
1276 * Set refcount to 1 for owner. Below, we will
1277 * pass ownership to the
1278 * consumer_thread_channel_poll() thread.
1280 channel
->refcount
= 1;
1282 case LTTNG_UST_CHAN_METADATA
:
1283 channel
->type
= CONSUMER_CHANNEL_TYPE_METADATA
;
1284 attr
.type
= LTTNG_UST_CHAN_METADATA
;
1291 health_code_update();
1293 ret
= ask_channel(ctx
, sock
, channel
, &attr
);
1295 goto end_channel_error
;
1298 if (msg
.u
.ask_channel
.type
== LTTNG_UST_CHAN_METADATA
) {
1299 ret
= consumer_metadata_cache_allocate(channel
);
1301 ERR("Allocating metadata cache");
1302 goto end_channel_error
;
1304 consumer_timer_switch_start(channel
, attr
.switch_timer_interval
);
1305 attr
.switch_timer_interval
= 0;
1307 consumer_timer_live_start(channel
,
1308 msg
.u
.ask_channel
.live_timer_interval
);
1311 health_code_update();
1314 * Add the channel to the internal state AFTER all streams were created
1315 * and successfully sent to session daemon. This way, all streams must
1316 * be ready before this channel is visible to the threads.
1317 * If add_channel succeeds, ownership of the channel is
1318 * passed to consumer_thread_channel_poll().
1320 ret
= add_channel(channel
, ctx
);
1322 if (msg
.u
.ask_channel
.type
== LTTNG_UST_CHAN_METADATA
) {
1323 if (channel
->switch_timer_enabled
== 1) {
1324 consumer_timer_switch_stop(channel
);
1326 consumer_metadata_cache_destroy(channel
);
1328 if (channel
->live_timer_enabled
== 1) {
1329 consumer_timer_live_stop(channel
);
1331 goto end_channel_error
;
1334 health_code_update();
1337 * Channel and streams are now created. Inform the session daemon that
1338 * everything went well and should wait to receive the channel and
1339 * streams with ustctl API.
1341 ret
= consumer_send_status_channel(sock
, channel
);
1344 * There is probably a problem on the socket.
1351 case LTTNG_CONSUMER_GET_CHANNEL
:
1353 int ret
, relayd_err
= 0;
1354 uint64_t key
= msg
.u
.get_channel
.key
;
1355 struct lttng_consumer_channel
*channel
;
1357 channel
= consumer_find_channel(key
);
1359 ERR("UST consumer get channel key %" PRIu64
" not found", key
);
1360 ret_code
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1361 goto end_msg_sessiond
;
1364 health_code_update();
1366 /* Send everything to sessiond. */
1367 ret
= send_sessiond_channel(sock
, channel
, ctx
, &relayd_err
);
1371 * We were unable to send to the relayd the stream so avoid
1372 * sending back a fatal error to the thread since this is OK
1373 * and the consumer can continue its work. The above call
1374 * has sent the error status message to the sessiond.
1379 * The communicaton was broken hence there is a bad state between
1380 * the consumer and sessiond so stop everything.
1385 health_code_update();
1388 * In no monitor mode, the streams ownership is kept inside the channel
1389 * so don't send them to the data thread.
1391 if (!channel
->monitor
) {
1392 goto end_msg_sessiond
;
1395 ret
= send_streams_to_thread(channel
, ctx
);
1398 * If we are unable to send the stream to the thread, there is
1399 * a big problem so just stop everything.
1403 /* List MUST be empty after or else it could be reused. */
1404 assert(cds_list_empty(&channel
->streams
.head
));
1405 goto end_msg_sessiond
;
1407 case LTTNG_CONSUMER_DESTROY_CHANNEL
:
1409 uint64_t key
= msg
.u
.destroy_channel
.key
;
1412 * Only called if streams have not been sent to stream
1413 * manager thread. However, channel has been sent to
1414 * channel manager thread.
1416 notify_thread_del_channel(ctx
, key
);
1417 goto end_msg_sessiond
;
1419 case LTTNG_CONSUMER_CLOSE_METADATA
:
1423 ret
= close_metadata(msg
.u
.close_metadata
.key
);
1428 goto end_msg_sessiond
;
1430 case LTTNG_CONSUMER_FLUSH_CHANNEL
:
1434 ret
= flush_channel(msg
.u
.flush_channel
.key
);
1439 goto end_msg_sessiond
;
1441 case LTTNG_CONSUMER_PUSH_METADATA
:
1444 uint64_t len
= msg
.u
.push_metadata
.len
;
1445 uint64_t key
= msg
.u
.push_metadata
.key
;
1446 uint64_t offset
= msg
.u
.push_metadata
.target_offset
;
1447 struct lttng_consumer_channel
*channel
;
1449 DBG("UST consumer push metadata key %" PRIu64
" of len %" PRIu64
, key
,
1452 channel
= consumer_find_channel(key
);
1454 ERR("UST consumer push metadata %" PRIu64
" not found", key
);
1455 ret_code
= LTTNG_ERR_UST_CHAN_NOT_FOUND
;
1456 goto end_msg_sessiond
;
1459 health_code_update();
1461 /* Tell session daemon we are ready to receive the metadata. */
1462 ret
= consumer_send_status_msg(sock
, LTTCOMM_CONSUMERD_SUCCESS
);
1464 /* Somehow, the session daemon is not responding anymore. */
1468 health_code_update();
1470 /* Wait for more data. */
1471 health_poll_entry();
1472 ret
= lttng_consumer_poll_socket(consumer_sockpoll
);
1478 health_code_update();
1480 ret
= lttng_ustconsumer_recv_metadata(sock
, key
, offset
,
1481 len
, channel
, 0, 1);
1483 /* error receiving from sessiond */
1487 goto end_msg_sessiond
;
1490 case LTTNG_CONSUMER_SETUP_METADATA
:
1494 ret
= setup_metadata(ctx
, msg
.u
.setup_metadata
.key
);
1498 goto end_msg_sessiond
;
1500 case LTTNG_CONSUMER_SNAPSHOT_CHANNEL
:
1502 if (msg
.u
.snapshot_channel
.metadata
) {
1503 ret
= snapshot_metadata(msg
.u
.snapshot_channel
.key
,
1504 msg
.u
.snapshot_channel
.pathname
,
1505 msg
.u
.snapshot_channel
.relayd_id
,
1508 ERR("Snapshot metadata failed");
1509 ret_code
= LTTNG_ERR_UST_META_FAIL
;
1512 ret
= snapshot_channel(msg
.u
.snapshot_channel
.key
,
1513 msg
.u
.snapshot_channel
.pathname
,
1514 msg
.u
.snapshot_channel
.relayd_id
,
1515 msg
.u
.snapshot_channel
.max_stream_size
,
1518 ERR("Snapshot channel failed");
1519 ret_code
= LTTNG_ERR_UST_CHAN_FAIL
;
1523 health_code_update();
1524 ret
= consumer_send_status_msg(sock
, ret_code
);
1526 /* Somehow, the session daemon is not responding anymore. */
1529 health_code_update();
1539 health_code_update();
1542 * Return 1 to indicate success since the 0 value can be a socket
1543 * shutdown during the recv() or send() call.
1549 * The returned value here is not useful since either way we'll return 1 to
1550 * the caller because the session daemon socket management is done
1551 * elsewhere. Returning a negative code or 0 will shutdown the consumer.
1553 ret
= consumer_send_status_msg(sock
, ret_code
);
1559 health_code_update();
1565 * Free channel here since no one has a reference to it. We don't
1566 * free after that because a stream can store this pointer.
1568 destroy_channel(channel
);
1570 /* We have to send a status channel message indicating an error. */
1571 ret
= consumer_send_status_channel(sock
, NULL
);
1573 /* Stop everything if session daemon can not be notified. */
1578 health_code_update();
1583 /* This will issue a consumer stop. */
1588 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
1589 * compiled out, we isolate it in this library.
1591 int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream
*stream
,
1595 assert(stream
->ustream
);
1597 return ustctl_get_mmap_read_offset(stream
->ustream
, off
);
1601 * Wrapper over the mmap() read offset from ust-ctl library. Since this can be
1602 * compiled out, we isolate it in this library.
1604 void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream
*stream
)
1607 assert(stream
->ustream
);
1609 return ustctl_get_mmap_base(stream
->ustream
);
1613 * Take a snapshot for a specific fd
1615 * Returns 0 on success, < 0 on error
1617 int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream
*stream
)
1620 assert(stream
->ustream
);
1622 return ustctl_snapshot(stream
->ustream
);
1626 * Get the produced position
1628 * Returns 0 on success, < 0 on error
1630 int lttng_ustconsumer_get_produced_snapshot(
1631 struct lttng_consumer_stream
*stream
, unsigned long *pos
)
1634 assert(stream
->ustream
);
1637 return ustctl_snapshot_get_produced(stream
->ustream
, pos
);
1641 * Get the consumed position
1643 * Returns 0 on success, < 0 on error
1645 int lttng_ustconsumer_get_consumed_snapshot(
1646 struct lttng_consumer_stream
*stream
, unsigned long *pos
)
1649 assert(stream
->ustream
);
1652 return ustctl_snapshot_get_consumed(stream
->ustream
, pos
);
1655 void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream
*stream
,
1659 assert(stream
->ustream
);
1661 ustctl_flush_buffer(stream
->ustream
, producer
);
1664 int lttng_ustconsumer_get_current_timestamp(
1665 struct lttng_consumer_stream
*stream
, uint64_t *ts
)
1668 assert(stream
->ustream
);
1671 return ustctl_get_current_timestamp(stream
->ustream
, ts
);
1675 * Called when the stream signal the consumer that it has hang up.
1677 void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream
*stream
)
1680 assert(stream
->ustream
);
1682 ustctl_flush_buffer(stream
->ustream
, 0);
1683 stream
->hangup_flush_done
= 1;
1686 void lttng_ustconsumer_del_channel(struct lttng_consumer_channel
*chan
)
1689 assert(chan
->uchan
);
1691 if (chan
->switch_timer_enabled
== 1) {
1692 consumer_timer_switch_stop(chan
);
1694 consumer_metadata_cache_destroy(chan
);
1695 ustctl_destroy_channel(chan
->uchan
);
1698 void lttng_ustconsumer_del_stream(struct lttng_consumer_stream
*stream
)
1701 assert(stream
->ustream
);
1703 if (stream
->chan
->switch_timer_enabled
== 1) {
1704 consumer_timer_switch_stop(stream
->chan
);
1706 ustctl_destroy_stream(stream
->ustream
);
1710 * Populate index values of a UST stream. Values are set in big endian order.
1712 * Return 0 on success or else a negative value.
1714 static int get_index_values(struct ctf_packet_index
*index
,
1715 struct ustctl_consumer_stream
*ustream
)
1719 ret
= ustctl_get_timestamp_begin(ustream
, &index
->timestamp_begin
);
1721 PERROR("ustctl_get_timestamp_begin");
1724 index
->timestamp_begin
= htobe64(index
->timestamp_begin
);
1726 ret
= ustctl_get_timestamp_end(ustream
, &index
->timestamp_end
);
1728 PERROR("ustctl_get_timestamp_end");
1731 index
->timestamp_end
= htobe64(index
->timestamp_end
);
1733 ret
= ustctl_get_events_discarded(ustream
, &index
->events_discarded
);
1735 PERROR("ustctl_get_events_discarded");
1738 index
->events_discarded
= htobe64(index
->events_discarded
);
1740 ret
= ustctl_get_content_size(ustream
, &index
->content_size
);
1742 PERROR("ustctl_get_content_size");
1745 index
->content_size
= htobe64(index
->content_size
);
1747 ret
= ustctl_get_packet_size(ustream
, &index
->packet_size
);
1749 PERROR("ustctl_get_packet_size");
1752 index
->packet_size
= htobe64(index
->packet_size
);
1754 ret
= ustctl_get_stream_id(ustream
, &index
->stream_id
);
1756 PERROR("ustctl_get_stream_id");
1759 index
->stream_id
= htobe64(index
->stream_id
);
1766 * Write up to one packet from the metadata cache to the channel.
1768 * Returns the number of bytes pushed in the cache, or a negative value
1772 int commit_one_metadata_packet(struct lttng_consumer_stream
*stream
)
1777 pthread_mutex_lock(&stream
->chan
->metadata_cache
->lock
);
1778 if (stream
->chan
->metadata_cache
->contiguous
1779 == stream
->ust_metadata_pushed
) {
1784 write_len
= ustctl_write_one_packet_to_channel(stream
->chan
->uchan
,
1785 &stream
->chan
->metadata_cache
->data
[stream
->ust_metadata_pushed
],
1786 stream
->chan
->metadata_cache
->contiguous
1787 - stream
->ust_metadata_pushed
);
1788 assert(write_len
!= 0);
1789 if (write_len
< 0) {
1790 ERR("Writing one metadata packet");
1794 stream
->ust_metadata_pushed
+= write_len
;
1796 assert(stream
->chan
->metadata_cache
->contiguous
>=
1797 stream
->ust_metadata_pushed
);
1801 pthread_mutex_unlock(&stream
->chan
->metadata_cache
->lock
);
1807 * Sync metadata meaning request them to the session daemon and snapshot to the
1808 * metadata thread can consumer them.
1810 * Metadata stream lock MUST be acquired.
1812 * Return 0 if new metadatda is available, EAGAIN if the metadata stream
1813 * is empty or a negative value on error.
1815 int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data
*ctx
,
1816 struct lttng_consumer_stream
*metadata
)
1825 * Request metadata from the sessiond, but don't wait for the flush
1826 * because we locked the metadata thread.
1828 ret
= lttng_ustconsumer_request_metadata(ctx
, metadata
->chan
, 0, 0);
1833 ret
= commit_one_metadata_packet(metadata
);
1836 } else if (ret
> 0) {
1840 ustctl_flush_buffer(metadata
->ustream
, 1);
1841 ret
= ustctl_snapshot(metadata
->ustream
);
1843 if (errno
!= EAGAIN
) {
1844 ERR("Sync metadata, taking UST snapshot");
1847 DBG("No new metadata when syncing them.");
1848 /* No new metadata, exit. */
1854 * After this flush, we still need to extract metadata.
1865 * Read subbuffer from the given stream.
1867 * Stream lock MUST be acquired.
1869 * Return 0 on success else a negative value.
1871 int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
1872 struct lttng_consumer_local_data
*ctx
)
1874 unsigned long len
, subbuf_size
, padding
;
1875 int err
, write_index
= 1;
1878 struct ustctl_consumer_stream
*ustream
;
1879 struct ctf_packet_index index
;
1882 assert(stream
->ustream
);
1885 DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream
->wait_fd
,
1888 /* Ease our life for what's next. */
1889 ustream
= stream
->ustream
;
1892 * We can consume the 1 byte written into the wait_fd by UST.
1893 * Don't trigger error if we cannot read this one byte (read
1894 * returns 0), or if the error is EAGAIN or EWOULDBLOCK.
1896 if (stream
->monitor
&& !stream
->hangup_flush_done
) {
1899 readlen
= lttng_read(stream
->wait_fd
, &dummy
, 1);
1900 if (readlen
< 0 && errno
!= EAGAIN
&& errno
!= EWOULDBLOCK
) {
1907 /* Get the next subbuffer */
1908 err
= ustctl_get_next_subbuf(ustream
);
1911 * Populate metadata info if the existing info has
1912 * already been read.
1914 if (stream
->metadata_flag
) {
1915 ret
= commit_one_metadata_packet(stream
);
1919 ustctl_flush_buffer(stream
->ustream
, 1);
1923 ret
= err
; /* ustctl_get_next_subbuf returns negative, caller expect positive. */
1925 * This is a debug message even for single-threaded consumer,
1926 * because poll() have more relaxed criterions than get subbuf,
1927 * so get_subbuf may fail for short race windows where poll()
1928 * would issue wakeups.
1930 DBG("Reserving sub buffer failed (everything is normal, "
1931 "it is due to concurrency) [ret: %d]", err
);
1934 assert(stream
->chan
->output
== CONSUMER_CHANNEL_MMAP
);
1936 if (!stream
->metadata_flag
) {
1937 index
.offset
= htobe64(stream
->out_fd_offset
);
1938 ret
= get_index_values(&index
, ustream
);
1946 /* Get the full padded subbuffer size */
1947 err
= ustctl_get_padded_subbuf_size(ustream
, &len
);
1950 /* Get subbuffer data size (without padding) */
1951 err
= ustctl_get_subbuf_size(ustream
, &subbuf_size
);
1954 /* Make sure we don't get a subbuffer size bigger than the padded */
1955 assert(len
>= subbuf_size
);
1957 padding
= len
- subbuf_size
;
1958 /* write the subbuffer to the tracefile */
1959 ret
= lttng_consumer_on_read_subbuffer_mmap(ctx
, stream
, subbuf_size
, padding
, &index
);
1961 * The mmap operation should write subbuf_size amount of data when network
1962 * streaming or the full padding (len) size when we are _not_ streaming.
1964 if ((ret
!= subbuf_size
&& stream
->net_seq_idx
!= (uint64_t) -1ULL) ||
1965 (ret
!= len
&& stream
->net_seq_idx
== (uint64_t) -1ULL)) {
1967 * Display the error but continue processing to try to release the
1968 * subbuffer. This is a DBG statement since any unexpected kill or
1969 * signal, the application gets unregistered, relayd gets closed or
1970 * anything that affects the buffer lifetime will trigger this error.
1971 * So, for the sake of the user, don't print this error since it can
1972 * happen and it is OK with the code flow.
1974 DBG("Error writing to tracefile "
1975 "(ret: %ld != len: %lu != subbuf_size: %lu)",
1976 ret
, len
, subbuf_size
);
1979 err
= ustctl_put_next_subbuf(ustream
);
1982 /* Write index if needed. */
1987 if (stream
->chan
->live_timer_interval
&& !stream
->metadata_flag
) {
1989 * In live, block until all the metadata is sent.
1991 err
= consumer_stream_sync_metadata(ctx
, stream
->session_id
);
1997 assert(!stream
->metadata_flag
);
1998 err
= consumer_stream_write_index(stream
, &index
);
2008 * Called when a stream is created.
2010 * Return 0 on success or else a negative value.
2012 int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream
*stream
)
2018 /* Don't create anything if this is set for streaming. */
2019 if (stream
->net_seq_idx
== (uint64_t) -1ULL && stream
->chan
->monitor
) {
2020 ret
= utils_create_stream_file(stream
->chan
->pathname
, stream
->name
,
2021 stream
->chan
->tracefile_size
, stream
->tracefile_count_current
,
2022 stream
->uid
, stream
->gid
, NULL
);
2026 stream
->out_fd
= ret
;
2027 stream
->tracefile_size_current
= 0;
2029 if (!stream
->metadata_flag
) {
2030 ret
= index_create_file(stream
->chan
->pathname
,
2031 stream
->name
, stream
->uid
, stream
->gid
,
2032 stream
->chan
->tracefile_size
,
2033 stream
->tracefile_count_current
);
2037 stream
->index_fd
= ret
;
2047 * Check if data is still being extracted from the buffers for a specific
2048 * stream. Consumer data lock MUST be acquired before calling this function
2049 * and the stream lock.
2051 * Return 1 if the traced data are still getting read else 0 meaning that the
2052 * data is available for trace viewer reading.
2054 int lttng_ustconsumer_data_pending(struct lttng_consumer_stream
*stream
)
2059 assert(stream
->ustream
);
2061 DBG("UST consumer checking data pending");
2063 if (stream
->endpoint_status
!= CONSUMER_ENDPOINT_ACTIVE
) {
2068 if (stream
->chan
->type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
2069 uint64_t contiguous
, pushed
;
2071 /* Ease our life a bit. */
2072 contiguous
= stream
->chan
->metadata_cache
->contiguous
;
2073 pushed
= stream
->ust_metadata_pushed
;
2076 * We can simply check whether all contiguously available data
2077 * has been pushed to the ring buffer, since the push operation
2078 * is performed within get_next_subbuf(), and because both
2079 * get_next_subbuf() and put_next_subbuf() are issued atomically
2080 * thanks to the stream lock within
2081 * lttng_ustconsumer_read_subbuffer(). This basically means that
2082 * whetnever ust_metadata_pushed is incremented, the associated
2083 * metadata has been consumed from the metadata stream.
2085 DBG("UST consumer metadata pending check: contiguous %" PRIu64
" vs pushed %" PRIu64
,
2086 contiguous
, pushed
);
2087 assert(((int64_t) contiguous
- pushed
) >= 0);
2088 if ((contiguous
!= pushed
) ||
2089 (((int64_t) contiguous
- pushed
) > 0 || contiguous
== 0)) {
2090 ret
= 1; /* Data is pending */
2094 ret
= ustctl_get_next_subbuf(stream
->ustream
);
2097 * There is still data so let's put back this
2100 ret
= ustctl_put_subbuf(stream
->ustream
);
2102 ret
= 1; /* Data is pending */
2107 /* Data is NOT pending so ready to be read. */
2115 * Close every metadata stream wait fd of the metadata hash table. This
2116 * function MUST be used very carefully so not to run into a race between the
2117 * metadata thread handling streams and this function closing their wait fd.
2119 * For UST, this is used when the session daemon hangs up. Its the metadata
2120 * producer so calling this is safe because we are assured that no state change
2121 * can occur in the metadata thread for the streams in the hash table.
2123 void lttng_ustconsumer_close_metadata(struct lttng_ht
*metadata_ht
)
2125 struct lttng_ht_iter iter
;
2126 struct lttng_consumer_stream
*stream
;
2128 assert(metadata_ht
);
2129 assert(metadata_ht
->ht
);
2131 DBG("UST consumer closing all metadata streams");
2134 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
,
2137 health_code_update();
2139 pthread_mutex_lock(&stream
->chan
->lock
);
2141 * Whatever returned value, we must continue to try to close everything
2144 (void) _close_metadata(stream
->chan
);
2145 DBG("Metadata wait fd %d and poll pipe fd %d closed", stream
->wait_fd
,
2146 stream
->ust_metadata_poll_pipe
[1]);
2147 pthread_mutex_unlock(&stream
->chan
->lock
);
2153 void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream
*stream
)
2157 ret
= ustctl_stream_close_wakeup_fd(stream
->ustream
);
2159 ERR("Unable to close wakeup fd");
2164 * Please refer to consumer-timer.c before adding any lock within this
2165 * function or any of its callees. Timers have a very strict locking
2166 * semantic with respect to teardown. Failure to respect this semantic
2167 * introduces deadlocks.
2169 int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data
*ctx
,
2170 struct lttng_consumer_channel
*channel
, int timer
, int wait
)
2172 struct lttcomm_metadata_request_msg request
;
2173 struct lttcomm_consumer_msg msg
;
2174 enum lttcomm_return_code ret_code
= LTTCOMM_CONSUMERD_SUCCESS
;
2175 uint64_t len
, key
, offset
;
2179 assert(channel
->metadata_cache
);
2181 /* send the metadata request to sessiond */
2182 switch (consumer_data
.type
) {
2183 case LTTNG_CONSUMER64_UST
:
2184 request
.bits_per_long
= 64;
2186 case LTTNG_CONSUMER32_UST
:
2187 request
.bits_per_long
= 32;
2190 request
.bits_per_long
= 0;
2194 request
.session_id
= channel
->session_id
;
2195 request
.session_id_per_pid
= channel
->session_id_per_pid
;
2197 * Request the application UID here so the metadata of that application can
2198 * be sent back. The channel UID corresponds to the user UID of the session
2199 * used for the rights on the stream file(s).
2201 request
.uid
= channel
->ust_app_uid
;
2202 request
.key
= channel
->key
;
2204 DBG("Sending metadata request to sessiond, session id %" PRIu64
2205 ", per-pid %" PRIu64
", app UID %u and channek key %" PRIu64
,
2206 request
.session_id
, request
.session_id_per_pid
, request
.uid
,
2209 pthread_mutex_lock(&ctx
->metadata_socket_lock
);
2211 health_code_update();
2213 ret
= lttcomm_send_unix_sock(ctx
->consumer_metadata_socket
, &request
,
2216 ERR("Asking metadata to sessiond");
2220 health_code_update();
2222 /* Receive the metadata from sessiond */
2223 ret
= lttcomm_recv_unix_sock(ctx
->consumer_metadata_socket
, &msg
,
2225 if (ret
!= sizeof(msg
)) {
2226 DBG("Consumer received unexpected message size %d (expects %zu)",
2228 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_ERROR_RECV_CMD
);
2230 * The ret value might 0 meaning an orderly shutdown but this is ok
2231 * since the caller handles this.
2236 health_code_update();
2238 if (msg
.cmd_type
== LTTNG_ERR_UND
) {
2239 /* No registry found */
2240 (void) consumer_send_status_msg(ctx
->consumer_metadata_socket
,
2244 } else if (msg
.cmd_type
!= LTTNG_CONSUMER_PUSH_METADATA
) {
2245 ERR("Unexpected cmd_type received %d", msg
.cmd_type
);
2250 len
= msg
.u
.push_metadata
.len
;
2251 key
= msg
.u
.push_metadata
.key
;
2252 offset
= msg
.u
.push_metadata
.target_offset
;
2254 assert(key
== channel
->key
);
2256 DBG("No new metadata to receive for key %" PRIu64
, key
);
2259 health_code_update();
2261 /* Tell session daemon we are ready to receive the metadata. */
2262 ret
= consumer_send_status_msg(ctx
->consumer_metadata_socket
,
2263 LTTCOMM_CONSUMERD_SUCCESS
);
2264 if (ret
< 0 || len
== 0) {
2266 * Somehow, the session daemon is not responding anymore or there is
2267 * nothing to receive.
2272 health_code_update();
2274 ret
= lttng_ustconsumer_recv_metadata(ctx
->consumer_metadata_socket
,
2275 key
, offset
, len
, channel
, timer
, wait
);
2278 * Only send the status msg if the sessiond is alive meaning a positive
2281 (void) consumer_send_status_msg(ctx
->consumer_metadata_socket
, ret
);
2286 health_code_update();
2288 pthread_mutex_unlock(&ctx
->metadata_socket_lock
);