2 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2012 - David Goulet <dgoulet@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
27 #include <sys/socket.h>
28 #include <sys/types.h>
33 #include <common/common.h>
34 #include <common/utils.h>
35 #include <common/compat/poll.h>
36 #include <common/kernel-ctl/kernel-ctl.h>
37 #include <common/sessiond-comm/relayd.h>
38 #include <common/sessiond-comm/sessiond-comm.h>
39 #include <common/kernel-consumer/kernel-consumer.h>
40 #include <common/relayd/relayd.h>
41 #include <common/ust-consumer/ust-consumer.h>
45 struct lttng_consumer_global_data consumer_data
= {
48 .type
= LTTNG_CONSUMER_UNKNOWN
,
51 enum consumer_channel_action
{
54 CONSUMER_CHANNEL_QUIT
,
57 struct consumer_channel_msg
{
58 enum consumer_channel_action action
;
59 struct lttng_consumer_channel
*chan
; /* add */
60 uint64_t key
; /* del */
64 * Flag to inform the polling thread to quit when all fd hung up. Updated by
65 * the consumer_thread_receive_fds when it notices that all fds has hung up.
66 * Also updated by the signal handler (consumer_should_exit()). Read by the
69 volatile int consumer_quit
;
72 * Global hash table containing respectively metadata and data streams. The
73 * stream element in this ht should only be updated by the metadata poll thread
74 * for the metadata and the data poll thread for the data.
76 static struct lttng_ht
*metadata_ht
;
77 static struct lttng_ht
*data_ht
;
80 * Notify a thread lttng pipe to poll back again. This usually means that some
81 * global state has changed so we just send back the thread in a poll wait
84 static void notify_thread_lttng_pipe(struct lttng_pipe
*pipe
)
86 struct lttng_consumer_stream
*null_stream
= NULL
;
90 (void) lttng_pipe_write(pipe
, &null_stream
, sizeof(null_stream
));
93 static void notify_channel_pipe(struct lttng_consumer_local_data
*ctx
,
94 struct lttng_consumer_channel
*chan
,
96 enum consumer_channel_action action
)
98 struct consumer_channel_msg msg
;
101 memset(&msg
, 0, sizeof(msg
));
107 ret
= write(ctx
->consumer_channel_pipe
[1], &msg
, sizeof(msg
));
108 } while (ret
< 0 && errno
== EINTR
);
111 void notify_thread_del_channel(struct lttng_consumer_local_data
*ctx
,
114 notify_channel_pipe(ctx
, NULL
, key
, CONSUMER_CHANNEL_DEL
);
117 static int read_channel_pipe(struct lttng_consumer_local_data
*ctx
,
118 struct lttng_consumer_channel
**chan
,
120 enum consumer_channel_action
*action
)
122 struct consumer_channel_msg msg
;
126 ret
= read(ctx
->consumer_channel_pipe
[0], &msg
, sizeof(msg
));
127 } while (ret
< 0 && errno
== EINTR
);
129 *action
= msg
.action
;
137 * Find a stream. The consumer_data.lock must be locked during this
140 static struct lttng_consumer_stream
*find_stream(uint64_t key
,
143 struct lttng_ht_iter iter
;
144 struct lttng_ht_node_u64
*node
;
145 struct lttng_consumer_stream
*stream
= NULL
;
149 /* -1ULL keys are lookup failures */
150 if (key
== (uint64_t) -1ULL) {
156 lttng_ht_lookup(ht
, &key
, &iter
);
157 node
= lttng_ht_iter_get_node_u64(&iter
);
159 stream
= caa_container_of(node
, struct lttng_consumer_stream
, node
);
167 static void steal_stream_key(uint64_t key
, struct lttng_ht
*ht
)
169 struct lttng_consumer_stream
*stream
;
172 stream
= find_stream(key
, ht
);
174 stream
->key
= (uint64_t) -1ULL;
176 * We don't want the lookup to match, but we still need
177 * to iterate on this stream when iterating over the hash table. Just
178 * change the node key.
180 stream
->node
.key
= (uint64_t) -1ULL;
186 * Return a channel object for the given key.
188 * RCU read side lock MUST be acquired before calling this function and
189 * protects the channel ptr.
191 struct lttng_consumer_channel
*consumer_find_channel(uint64_t key
)
193 struct lttng_ht_iter iter
;
194 struct lttng_ht_node_u64
*node
;
195 struct lttng_consumer_channel
*channel
= NULL
;
197 /* -1ULL keys are lookup failures */
198 if (key
== (uint64_t) -1ULL) {
202 lttng_ht_lookup(consumer_data
.channel_ht
, &key
, &iter
);
203 node
= lttng_ht_iter_get_node_u64(&iter
);
205 channel
= caa_container_of(node
, struct lttng_consumer_channel
, node
);
211 static void free_stream_rcu(struct rcu_head
*head
)
213 struct lttng_ht_node_u64
*node
=
214 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
215 struct lttng_consumer_stream
*stream
=
216 caa_container_of(node
, struct lttng_consumer_stream
, node
);
221 static void free_channel_rcu(struct rcu_head
*head
)
223 struct lttng_ht_node_u64
*node
=
224 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
225 struct lttng_consumer_channel
*channel
=
226 caa_container_of(node
, struct lttng_consumer_channel
, node
);
232 * RCU protected relayd socket pair free.
234 static void free_relayd_rcu(struct rcu_head
*head
)
236 struct lttng_ht_node_u64
*node
=
237 caa_container_of(head
, struct lttng_ht_node_u64
, head
);
238 struct consumer_relayd_sock_pair
*relayd
=
239 caa_container_of(node
, struct consumer_relayd_sock_pair
, node
);
242 * Close all sockets. This is done in the call RCU since we don't want the
243 * socket fds to be reassigned thus potentially creating bad state of the
246 * We do not have to lock the control socket mutex here since at this stage
247 * there is no one referencing to this relayd object.
249 (void) relayd_close(&relayd
->control_sock
);
250 (void) relayd_close(&relayd
->data_sock
);
256 * Destroy and free relayd socket pair object.
258 * This function MUST be called with the consumer_data lock acquired.
260 static void destroy_relayd(struct consumer_relayd_sock_pair
*relayd
)
263 struct lttng_ht_iter iter
;
265 if (relayd
== NULL
) {
269 DBG("Consumer destroy and close relayd socket pair");
271 iter
.iter
.node
= &relayd
->node
.node
;
272 ret
= lttng_ht_del(consumer_data
.relayd_ht
, &iter
);
274 /* We assume the relayd is being or is destroyed */
278 /* RCU free() call */
279 call_rcu(&relayd
->node
.head
, free_relayd_rcu
);
283 * Remove a channel from the global list protected by a mutex. This function is
284 * also responsible for freeing its data structures.
286 void consumer_del_channel(struct lttng_consumer_channel
*channel
)
289 struct lttng_ht_iter iter
;
290 struct lttng_consumer_stream
*stream
, *stmp
;
292 DBG("Consumer delete channel key %" PRIu64
, channel
->key
);
294 pthread_mutex_lock(&consumer_data
.lock
);
295 pthread_mutex_lock(&channel
->lock
);
297 switch (consumer_data
.type
) {
298 case LTTNG_CONSUMER_KERNEL
:
300 case LTTNG_CONSUMER32_UST
:
301 case LTTNG_CONSUMER64_UST
:
302 /* Delete streams that might have been left in the stream list. */
303 cds_list_for_each_entry_safe(stream
, stmp
, &channel
->streams
.head
,
305 cds_list_del(&stream
->send_node
);
306 lttng_ustconsumer_del_stream(stream
);
309 lttng_ustconsumer_del_channel(channel
);
312 ERR("Unknown consumer_data type");
318 iter
.iter
.node
= &channel
->node
.node
;
319 ret
= lttng_ht_del(consumer_data
.channel_ht
, &iter
);
323 call_rcu(&channel
->node
.head
, free_channel_rcu
);
325 pthread_mutex_unlock(&channel
->lock
);
326 pthread_mutex_unlock(&consumer_data
.lock
);
330 * Iterate over the relayd hash table and destroy each element. Finally,
331 * destroy the whole hash table.
333 static void cleanup_relayd_ht(void)
335 struct lttng_ht_iter iter
;
336 struct consumer_relayd_sock_pair
*relayd
;
340 cds_lfht_for_each_entry(consumer_data
.relayd_ht
->ht
, &iter
.iter
, relayd
,
342 destroy_relayd(relayd
);
347 lttng_ht_destroy(consumer_data
.relayd_ht
);
351 * Update the end point status of all streams having the given network sequence
352 * index (relayd index).
354 * It's atomically set without having the stream mutex locked which is fine
355 * because we handle the write/read race with a pipe wakeup for each thread.
357 static void update_endpoint_status_by_netidx(uint64_t net_seq_idx
,
358 enum consumer_endpoint_status status
)
360 struct lttng_ht_iter iter
;
361 struct lttng_consumer_stream
*stream
;
363 DBG("Consumer set delete flag on stream by idx %" PRIu64
, net_seq_idx
);
367 /* Let's begin with metadata */
368 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
369 if (stream
->net_seq_idx
== net_seq_idx
) {
370 uatomic_set(&stream
->endpoint_status
, status
);
371 DBG("Delete flag set to metadata stream %d", stream
->wait_fd
);
375 /* Follow up by the data streams */
376 cds_lfht_for_each_entry(data_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
377 if (stream
->net_seq_idx
== net_seq_idx
) {
378 uatomic_set(&stream
->endpoint_status
, status
);
379 DBG("Delete flag set to data stream %d", stream
->wait_fd
);
386 * Cleanup a relayd object by flagging every associated streams for deletion,
387 * destroying the object meaning removing it from the relayd hash table,
388 * closing the sockets and freeing the memory in a RCU call.
390 * If a local data context is available, notify the threads that the streams'
391 * state have changed.
393 static void cleanup_relayd(struct consumer_relayd_sock_pair
*relayd
,
394 struct lttng_consumer_local_data
*ctx
)
400 DBG("Cleaning up relayd sockets");
402 /* Save the net sequence index before destroying the object */
403 netidx
= relayd
->net_seq_idx
;
406 * Delete the relayd from the relayd hash table, close the sockets and free
407 * the object in a RCU call.
409 destroy_relayd(relayd
);
411 /* Set inactive endpoint to all streams */
412 update_endpoint_status_by_netidx(netidx
, CONSUMER_ENDPOINT_INACTIVE
);
415 * With a local data context, notify the threads that the streams' state
416 * have changed. The write() action on the pipe acts as an "implicit"
417 * memory barrier ordering the updates of the end point status from the
418 * read of this status which happens AFTER receiving this notify.
421 notify_thread_lttng_pipe(ctx
->consumer_data_pipe
);
422 notify_thread_lttng_pipe(ctx
->consumer_metadata_pipe
);
427 * Flag a relayd socket pair for destruction. Destroy it if the refcount
430 * RCU read side lock MUST be aquired before calling this function.
432 void consumer_flag_relayd_for_destroy(struct consumer_relayd_sock_pair
*relayd
)
436 /* Set destroy flag for this object */
437 uatomic_set(&relayd
->destroy_flag
, 1);
439 /* Destroy the relayd if refcount is 0 */
440 if (uatomic_read(&relayd
->refcount
) == 0) {
441 destroy_relayd(relayd
);
446 * Remove a stream from the global list protected by a mutex. This
447 * function is also responsible for freeing its data structures.
449 void consumer_del_stream(struct lttng_consumer_stream
*stream
,
453 struct lttng_ht_iter iter
;
454 struct lttng_consumer_channel
*free_chan
= NULL
;
455 struct consumer_relayd_sock_pair
*relayd
;
459 DBG("Consumer del stream %d", stream
->wait_fd
);
462 /* Means the stream was allocated but not successfully added */
463 goto free_stream_rcu
;
466 pthread_mutex_lock(&consumer_data
.lock
);
467 pthread_mutex_lock(&stream
->lock
);
469 switch (consumer_data
.type
) {
470 case LTTNG_CONSUMER_KERNEL
:
471 if (stream
->mmap_base
!= NULL
) {
472 ret
= munmap(stream
->mmap_base
, stream
->mmap_len
);
478 if (stream
->wait_fd
>= 0) {
479 ret
= close(stream
->wait_fd
);
485 case LTTNG_CONSUMER32_UST
:
486 case LTTNG_CONSUMER64_UST
:
487 lttng_ustconsumer_del_stream(stream
);
490 ERR("Unknown consumer_data type");
496 iter
.iter
.node
= &stream
->node
.node
;
497 ret
= lttng_ht_del(ht
, &iter
);
500 iter
.iter
.node
= &stream
->node_channel_id
.node
;
501 ret
= lttng_ht_del(consumer_data
.stream_per_chan_id_ht
, &iter
);
504 iter
.iter
.node
= &stream
->node_session_id
.node
;
505 ret
= lttng_ht_del(consumer_data
.stream_list_ht
, &iter
);
509 assert(consumer_data
.stream_count
> 0);
510 consumer_data
.stream_count
--;
512 if (stream
->out_fd
>= 0) {
513 ret
= close(stream
->out_fd
);
519 /* Check and cleanup relayd */
521 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
522 if (relayd
!= NULL
) {
523 uatomic_dec(&relayd
->refcount
);
524 assert(uatomic_read(&relayd
->refcount
) >= 0);
526 /* Closing streams requires to lock the control socket. */
527 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
528 ret
= relayd_send_close_stream(&relayd
->control_sock
,
529 stream
->relayd_stream_id
,
530 stream
->next_net_seq_num
- 1);
531 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
533 DBG("Unable to close stream on the relayd. Continuing");
535 * Continue here. There is nothing we can do for the relayd.
536 * Chances are that the relayd has closed the socket so we just
537 * continue cleaning up.
541 /* Both conditions are met, we destroy the relayd. */
542 if (uatomic_read(&relayd
->refcount
) == 0 &&
543 uatomic_read(&relayd
->destroy_flag
)) {
544 destroy_relayd(relayd
);
549 if (!uatomic_sub_return(&stream
->chan
->refcount
, 1)
550 && !uatomic_read(&stream
->chan
->nb_init_stream_left
)) {
551 free_chan
= stream
->chan
;
555 consumer_data
.need_update
= 1;
556 pthread_mutex_unlock(&stream
->lock
);
557 pthread_mutex_unlock(&consumer_data
.lock
);
560 consumer_del_channel(free_chan
);
564 call_rcu(&stream
->node
.head
, free_stream_rcu
);
567 struct lttng_consumer_stream
*consumer_allocate_stream(uint64_t channel_key
,
569 enum lttng_consumer_stream_state state
,
570 const char *channel_name
,
577 enum consumer_channel_type type
)
580 struct lttng_consumer_stream
*stream
;
582 stream
= zmalloc(sizeof(*stream
));
583 if (stream
== NULL
) {
584 PERROR("malloc struct lttng_consumer_stream");
591 stream
->key
= stream_key
;
593 stream
->out_fd_offset
= 0;
594 stream
->state
= state
;
597 stream
->net_seq_idx
= relayd_id
;
598 stream
->session_id
= session_id
;
599 pthread_mutex_init(&stream
->lock
, NULL
);
601 /* If channel is the metadata, flag this stream as metadata. */
602 if (type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
603 stream
->metadata_flag
= 1;
604 /* Metadata is flat out. */
605 strncpy(stream
->name
, DEFAULT_METADATA_NAME
, sizeof(stream
->name
));
607 /* Format stream name to <channel_name>_<cpu_number> */
608 ret
= snprintf(stream
->name
, sizeof(stream
->name
), "%s_%d",
611 PERROR("snprintf stream name");
616 /* Key is always the wait_fd for streams. */
617 lttng_ht_node_init_u64(&stream
->node
, stream
->key
);
619 /* Init node per channel id key */
620 lttng_ht_node_init_u64(&stream
->node_channel_id
, channel_key
);
622 /* Init session id node with the stream session id */
623 lttng_ht_node_init_u64(&stream
->node_session_id
, stream
->session_id
);
625 DBG3("Allocated stream %s (key %" PRIu64
", chan_key %" PRIu64
" relayd_id %" PRIu64
", session_id %" PRIu64
,
626 stream
->name
, stream
->key
, channel_key
, stream
->net_seq_idx
, stream
->session_id
);
642 * Add a stream to the global list protected by a mutex.
644 static int add_stream(struct lttng_consumer_stream
*stream
,
648 struct consumer_relayd_sock_pair
*relayd
;
653 DBG3("Adding consumer stream %" PRIu64
, stream
->key
);
655 pthread_mutex_lock(&consumer_data
.lock
);
656 pthread_mutex_lock(&stream
->chan
->lock
);
657 pthread_mutex_lock(&stream
->lock
);
660 /* Steal stream identifier to avoid having streams with the same key */
661 steal_stream_key(stream
->key
, ht
);
663 lttng_ht_add_unique_u64(ht
, &stream
->node
);
665 lttng_ht_add_u64(consumer_data
.stream_per_chan_id_ht
,
666 &stream
->node_channel_id
);
669 * Add stream to the stream_list_ht of the consumer data. No need to steal
670 * the key since the HT does not use it and we allow to add redundant keys
673 lttng_ht_add_u64(consumer_data
.stream_list_ht
, &stream
->node_session_id
);
675 /* Check and cleanup relayd */
676 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
677 if (relayd
!= NULL
) {
678 uatomic_inc(&relayd
->refcount
);
682 * When nb_init_stream_left reaches 0, we don't need to trigger any action
683 * in terms of destroying the associated channel, because the action that
684 * causes the count to become 0 also causes a stream to be added. The
685 * channel deletion will thus be triggered by the following removal of this
688 if (uatomic_read(&stream
->chan
->nb_init_stream_left
) > 0) {
689 /* Increment refcount before decrementing nb_init_stream_left */
691 uatomic_dec(&stream
->chan
->nb_init_stream_left
);
694 /* Update consumer data once the node is inserted. */
695 consumer_data
.stream_count
++;
696 consumer_data
.need_update
= 1;
699 pthread_mutex_unlock(&stream
->lock
);
700 pthread_mutex_unlock(&stream
->chan
->lock
);
701 pthread_mutex_unlock(&consumer_data
.lock
);
707 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
708 * be acquired before calling this.
710 static int add_relayd(struct consumer_relayd_sock_pair
*relayd
)
713 struct lttng_ht_node_u64
*node
;
714 struct lttng_ht_iter iter
;
718 lttng_ht_lookup(consumer_data
.relayd_ht
,
719 &relayd
->net_seq_idx
, &iter
);
720 node
= lttng_ht_iter_get_node_u64(&iter
);
724 lttng_ht_add_unique_u64(consumer_data
.relayd_ht
, &relayd
->node
);
731 * Allocate and return a consumer relayd socket.
733 struct consumer_relayd_sock_pair
*consumer_allocate_relayd_sock_pair(
734 uint64_t net_seq_idx
)
736 struct consumer_relayd_sock_pair
*obj
= NULL
;
738 /* net sequence index of -1 is a failure */
739 if (net_seq_idx
== (uint64_t) -1ULL) {
743 obj
= zmalloc(sizeof(struct consumer_relayd_sock_pair
));
745 PERROR("zmalloc relayd sock");
749 obj
->net_seq_idx
= net_seq_idx
;
751 obj
->destroy_flag
= 0;
752 obj
->control_sock
.sock
.fd
= -1;
753 obj
->data_sock
.sock
.fd
= -1;
754 lttng_ht_node_init_u64(&obj
->node
, obj
->net_seq_idx
);
755 pthread_mutex_init(&obj
->ctrl_sock_mutex
, NULL
);
762 * Find a relayd socket pair in the global consumer data.
764 * Return the object if found else NULL.
765 * RCU read-side lock must be held across this call and while using the
768 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
)
770 struct lttng_ht_iter iter
;
771 struct lttng_ht_node_u64
*node
;
772 struct consumer_relayd_sock_pair
*relayd
= NULL
;
774 /* Negative keys are lookup failures */
775 if (key
== (uint64_t) -1ULL) {
779 lttng_ht_lookup(consumer_data
.relayd_ht
, &key
,
781 node
= lttng_ht_iter_get_node_u64(&iter
);
783 relayd
= caa_container_of(node
, struct consumer_relayd_sock_pair
, node
);
791 * Handle stream for relayd transmission if the stream applies for network
792 * streaming where the net sequence index is set.
794 * Return destination file descriptor or negative value on error.
796 static int write_relayd_stream_header(struct lttng_consumer_stream
*stream
,
797 size_t data_size
, unsigned long padding
,
798 struct consumer_relayd_sock_pair
*relayd
)
801 struct lttcomm_relayd_data_hdr data_hdr
;
807 /* Reset data header */
808 memset(&data_hdr
, 0, sizeof(data_hdr
));
810 if (stream
->metadata_flag
) {
811 /* Caller MUST acquire the relayd control socket lock */
812 ret
= relayd_send_metadata(&relayd
->control_sock
, data_size
);
817 /* Metadata are always sent on the control socket. */
818 outfd
= relayd
->control_sock
.sock
.fd
;
820 /* Set header with stream information */
821 data_hdr
.stream_id
= htobe64(stream
->relayd_stream_id
);
822 data_hdr
.data_size
= htobe32(data_size
);
823 data_hdr
.padding_size
= htobe32(padding
);
825 * Note that net_seq_num below is assigned with the *current* value of
826 * next_net_seq_num and only after that the next_net_seq_num will be
827 * increment. This is why when issuing a command on the relayd using
828 * this next value, 1 should always be substracted in order to compare
829 * the last seen sequence number on the relayd side to the last sent.
831 data_hdr
.net_seq_num
= htobe64(stream
->next_net_seq_num
);
832 /* Other fields are zeroed previously */
834 ret
= relayd_send_data_hdr(&relayd
->data_sock
, &data_hdr
,
840 ++stream
->next_net_seq_num
;
842 /* Set to go on data socket */
843 outfd
= relayd
->data_sock
.sock
.fd
;
851 * Allocate and return a new lttng_consumer_channel object using the given key
852 * to initialize the hash table node.
854 * On error, return NULL.
856 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
858 const char *pathname
,
863 enum lttng_event_output output
,
864 uint64_t tracefile_size
,
865 uint64_t tracefile_count
,
866 uint64_t session_id_per_pid
)
868 struct lttng_consumer_channel
*channel
;
870 channel
= zmalloc(sizeof(*channel
));
871 if (channel
== NULL
) {
872 PERROR("malloc struct lttng_consumer_channel");
877 channel
->refcount
= 0;
878 channel
->session_id
= session_id
;
879 channel
->session_id_per_pid
= session_id_per_pid
;
882 channel
->relayd_id
= relayd_id
;
883 channel
->output
= output
;
884 channel
->tracefile_size
= tracefile_size
;
885 channel
->tracefile_count
= tracefile_count
;
886 pthread_mutex_init(&channel
->lock
, NULL
);
888 strncpy(channel
->pathname
, pathname
, sizeof(channel
->pathname
));
889 channel
->pathname
[sizeof(channel
->pathname
) - 1] = '\0';
891 strncpy(channel
->name
, name
, sizeof(channel
->name
));
892 channel
->name
[sizeof(channel
->name
) - 1] = '\0';
894 lttng_ht_node_init_u64(&channel
->node
, channel
->key
);
896 channel
->wait_fd
= -1;
898 CDS_INIT_LIST_HEAD(&channel
->streams
.head
);
900 DBG("Allocated channel (key %" PRIu64
")", channel
->key
)
907 * Add a channel to the global list protected by a mutex.
909 * On success 0 is returned else a negative value.
911 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
912 struct lttng_consumer_local_data
*ctx
)
915 struct lttng_ht_node_u64
*node
;
916 struct lttng_ht_iter iter
;
918 pthread_mutex_lock(&consumer_data
.lock
);
919 pthread_mutex_lock(&channel
->lock
);
922 lttng_ht_lookup(consumer_data
.channel_ht
, &channel
->key
, &iter
);
923 node
= lttng_ht_iter_get_node_u64(&iter
);
925 /* Channel already exist. Ignore the insertion */
926 ERR("Consumer add channel key %" PRIu64
" already exists!",
932 lttng_ht_add_unique_u64(consumer_data
.channel_ht
, &channel
->node
);
936 pthread_mutex_unlock(&channel
->lock
);
937 pthread_mutex_unlock(&consumer_data
.lock
);
939 if (!ret
&& channel
->wait_fd
!= -1 &&
940 channel
->metadata_stream
== NULL
) {
941 notify_channel_pipe(ctx
, channel
, -1, CONSUMER_CHANNEL_ADD
);
947 * Allocate the pollfd structure and the local view of the out fds to avoid
948 * doing a lookup in the linked list and concurrency issues when writing is
949 * needed. Called with consumer_data.lock held.
951 * Returns the number of fds in the structures.
953 static int update_poll_array(struct lttng_consumer_local_data
*ctx
,
954 struct pollfd
**pollfd
, struct lttng_consumer_stream
**local_stream
,
958 struct lttng_ht_iter iter
;
959 struct lttng_consumer_stream
*stream
;
964 assert(local_stream
);
966 DBG("Updating poll fd array");
968 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
970 * Only active streams with an active end point can be added to the
971 * poll set and local stream storage of the thread.
973 * There is a potential race here for endpoint_status to be updated
974 * just after the check. However, this is OK since the stream(s) will
975 * be deleted once the thread is notified that the end point state has
976 * changed where this function will be called back again.
978 if (stream
->state
!= LTTNG_CONSUMER_ACTIVE_STREAM
||
979 stream
->endpoint_status
== CONSUMER_ENDPOINT_INACTIVE
) {
983 * This clobbers way too much the debug output. Uncomment that if you
984 * need it for debugging purposes.
986 * DBG("Active FD %d", stream->wait_fd);
988 (*pollfd
)[i
].fd
= stream
->wait_fd
;
989 (*pollfd
)[i
].events
= POLLIN
| POLLPRI
;
990 local_stream
[i
] = stream
;
996 * Insert the consumer_data_pipe at the end of the array and don't
997 * increment i so nb_fd is the number of real FD.
999 (*pollfd
)[i
].fd
= lttng_pipe_get_readfd(ctx
->consumer_data_pipe
);
1000 (*pollfd
)[i
].events
= POLLIN
| POLLPRI
;
1005 * Poll on the should_quit pipe and the command socket return -1 on error and
1006 * should exit, 0 if data is available on the command socket
1008 int lttng_consumer_poll_socket(struct pollfd
*consumer_sockpoll
)
1013 num_rdy
= poll(consumer_sockpoll
, 2, -1);
1014 if (num_rdy
== -1) {
1016 * Restart interrupted system call.
1018 if (errno
== EINTR
) {
1021 PERROR("Poll error");
1024 if (consumer_sockpoll
[0].revents
& (POLLIN
| POLLPRI
)) {
1025 DBG("consumer_should_quit wake up");
1035 * Set the error socket.
1037 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
1040 ctx
->consumer_error_socket
= sock
;
1044 * Set the command socket path.
1046 void lttng_consumer_set_command_sock_path(
1047 struct lttng_consumer_local_data
*ctx
, char *sock
)
1049 ctx
->consumer_command_sock_path
= sock
;
1053 * Send return code to the session daemon.
1054 * If the socket is not defined, we return 0, it is not a fatal error
1056 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
)
1058 if (ctx
->consumer_error_socket
> 0) {
1059 return lttcomm_send_unix_sock(ctx
->consumer_error_socket
, &cmd
,
1060 sizeof(enum lttcomm_sessiond_command
));
1067 * Close all the tracefiles and stream fds and MUST be called when all
1068 * instances are destroyed i.e. when all threads were joined and are ended.
1070 void lttng_consumer_cleanup(void)
1072 struct lttng_ht_iter iter
;
1073 struct lttng_consumer_channel
*channel
;
1077 cds_lfht_for_each_entry(consumer_data
.channel_ht
->ht
, &iter
.iter
, channel
,
1079 consumer_del_channel(channel
);
1084 lttng_ht_destroy(consumer_data
.channel_ht
);
1086 cleanup_relayd_ht();
1088 lttng_ht_destroy(consumer_data
.stream_per_chan_id_ht
);
1091 * This HT contains streams that are freed by either the metadata thread or
1092 * the data thread so we do *nothing* on the hash table and simply destroy
1095 lttng_ht_destroy(consumer_data
.stream_list_ht
);
1099 * Called from signal handler.
1101 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
)
1106 ret
= write(ctx
->consumer_should_quit
[1], "4", 1);
1107 } while (ret
< 0 && errno
== EINTR
);
1108 if (ret
< 0 || ret
!= 1) {
1109 PERROR("write consumer quit");
1112 DBG("Consumer flag that it should quit");
1115 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream
*stream
,
1118 int outfd
= stream
->out_fd
;
1121 * This does a blocking write-and-wait on any page that belongs to the
1122 * subbuffer prior to the one we just wrote.
1123 * Don't care about error values, as these are just hints and ways to
1124 * limit the amount of page cache used.
1126 if (orig_offset
< stream
->max_sb_size
) {
1129 lttng_sync_file_range(outfd
, orig_offset
- stream
->max_sb_size
,
1130 stream
->max_sb_size
,
1131 SYNC_FILE_RANGE_WAIT_BEFORE
1132 | SYNC_FILE_RANGE_WRITE
1133 | SYNC_FILE_RANGE_WAIT_AFTER
);
1135 * Give hints to the kernel about how we access the file:
1136 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
1139 * We need to call fadvise again after the file grows because the
1140 * kernel does not seem to apply fadvise to non-existing parts of the
1143 * Call fadvise _after_ having waited for the page writeback to
1144 * complete because the dirty page writeback semantic is not well
1145 * defined. So it can be expected to lead to lower throughput in
1148 posix_fadvise(outfd
, orig_offset
- stream
->max_sb_size
,
1149 stream
->max_sb_size
, POSIX_FADV_DONTNEED
);
1153 * Initialise the necessary environnement :
1154 * - create a new context
1155 * - create the poll_pipe
1156 * - create the should_quit pipe (for signal handler)
1157 * - create the thread pipe (for splice)
1159 * Takes a function pointer as argument, this function is called when data is
1160 * available on a buffer. This function is responsible to do the
1161 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
1162 * buffer configuration and then kernctl_put_next_subbuf at the end.
1164 * Returns a pointer to the new context or NULL on error.
1166 struct lttng_consumer_local_data
*lttng_consumer_create(
1167 enum lttng_consumer_type type
,
1168 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
1169 struct lttng_consumer_local_data
*ctx
),
1170 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
1171 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
1172 int (*update_stream
)(uint64_t stream_key
, uint32_t state
))
1175 struct lttng_consumer_local_data
*ctx
;
1177 assert(consumer_data
.type
== LTTNG_CONSUMER_UNKNOWN
||
1178 consumer_data
.type
== type
);
1179 consumer_data
.type
= type
;
1181 ctx
= zmalloc(sizeof(struct lttng_consumer_local_data
));
1183 PERROR("allocating context");
1187 ctx
->consumer_error_socket
= -1;
1188 ctx
->consumer_metadata_socket
= -1;
1189 /* assign the callbacks */
1190 ctx
->on_buffer_ready
= buffer_ready
;
1191 ctx
->on_recv_channel
= recv_channel
;
1192 ctx
->on_recv_stream
= recv_stream
;
1193 ctx
->on_update_stream
= update_stream
;
1195 ctx
->consumer_data_pipe
= lttng_pipe_open(0);
1196 if (!ctx
->consumer_data_pipe
) {
1197 goto error_poll_pipe
;
1200 ret
= pipe(ctx
->consumer_should_quit
);
1202 PERROR("Error creating recv pipe");
1203 goto error_quit_pipe
;
1206 ret
= pipe(ctx
->consumer_thread_pipe
);
1208 PERROR("Error creating thread pipe");
1209 goto error_thread_pipe
;
1212 ret
= pipe(ctx
->consumer_channel_pipe
);
1214 PERROR("Error creating channel pipe");
1215 goto error_channel_pipe
;
1218 ctx
->consumer_metadata_pipe
= lttng_pipe_open(0);
1219 if (!ctx
->consumer_metadata_pipe
) {
1220 goto error_metadata_pipe
;
1223 ret
= utils_create_pipe(ctx
->consumer_splice_metadata_pipe
);
1225 goto error_splice_pipe
;
1231 lttng_pipe_destroy(ctx
->consumer_metadata_pipe
);
1232 error_metadata_pipe
:
1233 utils_close_pipe(ctx
->consumer_channel_pipe
);
1235 utils_close_pipe(ctx
->consumer_thread_pipe
);
1237 utils_close_pipe(ctx
->consumer_should_quit
);
1239 lttng_pipe_destroy(ctx
->consumer_data_pipe
);
1247 * Close all fds associated with the instance and free the context.
1249 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
)
1253 DBG("Consumer destroying it. Closing everything.");
1255 ret
= close(ctx
->consumer_error_socket
);
1259 ret
= close(ctx
->consumer_metadata_socket
);
1263 utils_close_pipe(ctx
->consumer_thread_pipe
);
1264 utils_close_pipe(ctx
->consumer_channel_pipe
);
1265 lttng_pipe_destroy(ctx
->consumer_data_pipe
);
1266 lttng_pipe_destroy(ctx
->consumer_metadata_pipe
);
1267 utils_close_pipe(ctx
->consumer_should_quit
);
1268 utils_close_pipe(ctx
->consumer_splice_metadata_pipe
);
1270 unlink(ctx
->consumer_command_sock_path
);
1275 * Write the metadata stream id on the specified file descriptor.
1277 static int write_relayd_metadata_id(int fd
,
1278 struct lttng_consumer_stream
*stream
,
1279 struct consumer_relayd_sock_pair
*relayd
, unsigned long padding
)
1282 struct lttcomm_relayd_metadata_payload hdr
;
1284 hdr
.stream_id
= htobe64(stream
->relayd_stream_id
);
1285 hdr
.padding_size
= htobe32(padding
);
1287 ret
= write(fd
, (void *) &hdr
, sizeof(hdr
));
1288 } while (ret
< 0 && errno
== EINTR
);
1289 if (ret
< 0 || ret
!= sizeof(hdr
)) {
1291 * This error means that the fd's end is closed so ignore the perror
1292 * not to clubber the error output since this can happen in a normal
1295 if (errno
!= EPIPE
) {
1296 PERROR("write metadata stream id");
1298 DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno
);
1300 * Set ret to a negative value because if ret != sizeof(hdr), we don't
1301 * handle writting the missing part so report that as an error and
1302 * don't lie to the caller.
1307 DBG("Metadata stream id %" PRIu64
" with padding %lu written before data",
1308 stream
->relayd_stream_id
, padding
);
1315 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1316 * core function for writing trace buffers to either the local filesystem or
1319 * It must be called with the stream lock held.
1321 * Careful review MUST be put if any changes occur!
1323 * Returns the number of bytes written
1325 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
1326 struct lttng_consumer_local_data
*ctx
,
1327 struct lttng_consumer_stream
*stream
, unsigned long len
,
1328 unsigned long padding
)
1330 unsigned long mmap_offset
;
1332 ssize_t ret
= 0, written
= 0;
1333 off_t orig_offset
= stream
->out_fd_offset
;
1334 /* Default is on the disk */
1335 int outfd
= stream
->out_fd
;
1336 struct consumer_relayd_sock_pair
*relayd
= NULL
;
1337 unsigned int relayd_hang_up
= 0;
1339 /* RCU lock for the relayd pointer */
1342 /* Flag that the current stream if set for network streaming. */
1343 if (stream
->net_seq_idx
!= (uint64_t) -1ULL) {
1344 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1345 if (relayd
== NULL
) {
1350 /* get the offset inside the fd to mmap */
1351 switch (consumer_data
.type
) {
1352 case LTTNG_CONSUMER_KERNEL
:
1353 mmap_base
= stream
->mmap_base
;
1354 ret
= kernctl_get_mmap_read_offset(stream
->wait_fd
, &mmap_offset
);
1356 case LTTNG_CONSUMER32_UST
:
1357 case LTTNG_CONSUMER64_UST
:
1358 mmap_base
= lttng_ustctl_get_mmap_base(stream
);
1360 ERR("read mmap get mmap base for stream %s", stream
->name
);
1364 ret
= lttng_ustctl_get_mmap_read_offset(stream
, &mmap_offset
);
1368 ERR("Unknown consumer_data type");
1373 PERROR("tracer ctl get_mmap_read_offset");
1378 /* Handle stream on the relayd if the output is on the network */
1380 unsigned long netlen
= len
;
1383 * Lock the control socket for the complete duration of the function
1384 * since from this point on we will use the socket.
1386 if (stream
->metadata_flag
) {
1387 /* Metadata requires the control socket. */
1388 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1389 netlen
+= sizeof(struct lttcomm_relayd_metadata_payload
);
1392 ret
= write_relayd_stream_header(stream
, netlen
, padding
, relayd
);
1394 /* Use the returned socket. */
1397 /* Write metadata stream id before payload */
1398 if (stream
->metadata_flag
) {
1399 ret
= write_relayd_metadata_id(outfd
, stream
, relayd
, padding
);
1402 /* Socket operation failed. We consider the relayd dead */
1403 if (ret
== -EPIPE
|| ret
== -EINVAL
) {
1411 /* Socket operation failed. We consider the relayd dead */
1412 if (ret
== -EPIPE
|| ret
== -EINVAL
) {
1416 /* Else, use the default set before which is the filesystem. */
1419 /* No streaming, we have to set the len with the full padding */
1423 * Check if we need to change the tracefile before writing the packet.
1425 if (stream
->chan
->tracefile_size
> 0 &&
1426 (stream
->tracefile_size_current
+ len
) >
1427 stream
->chan
->tracefile_size
) {
1428 ret
= utils_rotate_stream_file(stream
->chan
->pathname
,
1429 stream
->name
, stream
->chan
->tracefile_size
,
1430 stream
->chan
->tracefile_count
, stream
->uid
, stream
->gid
,
1431 stream
->out_fd
, &(stream
->tracefile_count_current
));
1433 ERR("Rotating output file");
1436 outfd
= stream
->out_fd
= ret
;
1437 /* Reset current size because we just perform a rotation. */
1438 stream
->tracefile_size_current
= 0;
1440 stream
->tracefile_size_current
+= len
;
1445 ret
= write(outfd
, mmap_base
+ mmap_offset
, len
);
1446 } while (ret
< 0 && errno
== EINTR
);
1447 DBG("Consumer mmap write() ret %zd (len %lu)", ret
, len
);
1450 * This is possible if the fd is closed on the other side (outfd)
1451 * or any write problem. It can be verbose a bit for a normal
1452 * execution if for instance the relayd is stopped abruptly. This
1453 * can happen so set this to a DBG statement.
1455 DBG("Error in file write mmap");
1459 /* Socket operation failed. We consider the relayd dead */
1460 if (errno
== EPIPE
|| errno
== EINVAL
) {
1465 } else if (ret
> len
) {
1466 PERROR("Error in file write (ret %zd > len %lu)", ret
, len
);
1474 /* This call is useless on a socket so better save a syscall. */
1476 /* This won't block, but will start writeout asynchronously */
1477 lttng_sync_file_range(outfd
, stream
->out_fd_offset
, ret
,
1478 SYNC_FILE_RANGE_WRITE
);
1479 stream
->out_fd_offset
+= ret
;
1483 lttng_consumer_sync_trace_file(stream
, orig_offset
);
1487 * This is a special case that the relayd has closed its socket. Let's
1488 * cleanup the relayd object and all associated streams.
1490 if (relayd
&& relayd_hang_up
) {
1491 cleanup_relayd(relayd
, ctx
);
1495 /* Unlock only if ctrl socket used */
1496 if (relayd
&& stream
->metadata_flag
) {
1497 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1505 * Splice the data from the ring buffer to the tracefile.
1507 * It must be called with the stream lock held.
1509 * Returns the number of bytes spliced.
1511 ssize_t
lttng_consumer_on_read_subbuffer_splice(
1512 struct lttng_consumer_local_data
*ctx
,
1513 struct lttng_consumer_stream
*stream
, unsigned long len
,
1514 unsigned long padding
)
1516 ssize_t ret
= 0, written
= 0, ret_splice
= 0;
1518 off_t orig_offset
= stream
->out_fd_offset
;
1519 int fd
= stream
->wait_fd
;
1520 /* Default is on the disk */
1521 int outfd
= stream
->out_fd
;
1522 struct consumer_relayd_sock_pair
*relayd
= NULL
;
1524 unsigned int relayd_hang_up
= 0;
1526 switch (consumer_data
.type
) {
1527 case LTTNG_CONSUMER_KERNEL
:
1529 case LTTNG_CONSUMER32_UST
:
1530 case LTTNG_CONSUMER64_UST
:
1531 /* Not supported for user space tracing */
1534 ERR("Unknown consumer_data type");
1538 /* RCU lock for the relayd pointer */
1541 /* Flag that the current stream if set for network streaming. */
1542 if (stream
->net_seq_idx
!= (uint64_t) -1ULL) {
1543 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1544 if (relayd
== NULL
) {
1550 * Choose right pipe for splice. Metadata and trace data are handled by
1551 * different threads hence the use of two pipes in order not to race or
1552 * corrupt the written data.
1554 if (stream
->metadata_flag
) {
1555 splice_pipe
= ctx
->consumer_splice_metadata_pipe
;
1557 splice_pipe
= ctx
->consumer_thread_pipe
;
1560 /* Write metadata stream id before payload */
1562 int total_len
= len
;
1564 if (stream
->metadata_flag
) {
1566 * Lock the control socket for the complete duration of the function
1567 * since from this point on we will use the socket.
1569 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1571 ret
= write_relayd_metadata_id(splice_pipe
[1], stream
, relayd
,
1575 /* Socket operation failed. We consider the relayd dead */
1576 if (ret
== -EBADF
) {
1577 WARN("Remote relayd disconnected. Stopping");
1584 total_len
+= sizeof(struct lttcomm_relayd_metadata_payload
);
1587 ret
= write_relayd_stream_header(stream
, total_len
, padding
, relayd
);
1589 /* Use the returned socket. */
1592 /* Socket operation failed. We consider the relayd dead */
1593 if (ret
== -EBADF
) {
1594 WARN("Remote relayd disconnected. Stopping");
1601 /* No streaming, we have to set the len with the full padding */
1605 * Check if we need to change the tracefile before writing the packet.
1607 if (stream
->chan
->tracefile_size
> 0 &&
1608 (stream
->tracefile_size_current
+ len
) >
1609 stream
->chan
->tracefile_size
) {
1610 ret
= utils_rotate_stream_file(stream
->chan
->pathname
,
1611 stream
->name
, stream
->chan
->tracefile_size
,
1612 stream
->chan
->tracefile_count
, stream
->uid
, stream
->gid
,
1613 stream
->out_fd
, &(stream
->tracefile_count_current
));
1615 ERR("Rotating output file");
1618 outfd
= stream
->out_fd
= ret
;
1619 /* Reset current size because we just perform a rotation. */
1620 stream
->tracefile_size_current
= 0;
1622 stream
->tracefile_size_current
+= len
;
1626 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1627 (unsigned long)offset
, len
, fd
, splice_pipe
[1]);
1628 ret_splice
= splice(fd
, &offset
, splice_pipe
[1], NULL
, len
,
1629 SPLICE_F_MOVE
| SPLICE_F_MORE
);
1630 DBG("splice chan to pipe, ret %zd", ret_splice
);
1631 if (ret_splice
< 0) {
1632 PERROR("Error in relay splice");
1634 written
= ret_splice
;
1640 /* Handle stream on the relayd if the output is on the network */
1642 if (stream
->metadata_flag
) {
1643 size_t metadata_payload_size
=
1644 sizeof(struct lttcomm_relayd_metadata_payload
);
1646 /* Update counter to fit the spliced data */
1647 ret_splice
+= metadata_payload_size
;
1648 len
+= metadata_payload_size
;
1650 * We do this so the return value can match the len passed as
1651 * argument to this function.
1653 written
-= metadata_payload_size
;
1657 /* Splice data out */
1658 ret_splice
= splice(splice_pipe
[0], NULL
, outfd
, NULL
,
1659 ret_splice
, SPLICE_F_MOVE
| SPLICE_F_MORE
);
1660 DBG("Consumer splice pipe to file, ret %zd", ret_splice
);
1661 if (ret_splice
< 0) {
1662 PERROR("Error in file splice");
1664 written
= ret_splice
;
1666 /* Socket operation failed. We consider the relayd dead */
1667 if (errno
== EBADF
|| errno
== EPIPE
) {
1668 WARN("Remote relayd disconnected. Stopping");
1674 } else if (ret_splice
> len
) {
1676 PERROR("Wrote more data than requested %zd (len: %lu)",
1678 written
+= ret_splice
;
1684 /* This call is useless on a socket so better save a syscall. */
1686 /* This won't block, but will start writeout asynchronously */
1687 lttng_sync_file_range(outfd
, stream
->out_fd_offset
, ret_splice
,
1688 SYNC_FILE_RANGE_WRITE
);
1689 stream
->out_fd_offset
+= ret_splice
;
1691 written
+= ret_splice
;
1693 lttng_consumer_sync_trace_file(stream
, orig_offset
);
1701 * This is a special case that the relayd has closed its socket. Let's
1702 * cleanup the relayd object and all associated streams.
1704 if (relayd
&& relayd_hang_up
) {
1705 cleanup_relayd(relayd
, ctx
);
1706 /* Skip splice error so the consumer does not fail */
1711 /* send the appropriate error description to sessiond */
1714 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_EINVAL
);
1717 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_ENOMEM
);
1720 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_ESPIPE
);
1725 if (relayd
&& stream
->metadata_flag
) {
1726 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1734 * Take a snapshot for a specific fd
1736 * Returns 0 on success, < 0 on error
1738 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
)
1740 switch (consumer_data
.type
) {
1741 case LTTNG_CONSUMER_KERNEL
:
1742 return lttng_kconsumer_take_snapshot(stream
);
1743 case LTTNG_CONSUMER32_UST
:
1744 case LTTNG_CONSUMER64_UST
:
1745 return lttng_ustconsumer_take_snapshot(stream
);
1747 ERR("Unknown consumer_data type");
1754 * Get the produced position
1756 * Returns 0 on success, < 0 on error
1758 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
1761 switch (consumer_data
.type
) {
1762 case LTTNG_CONSUMER_KERNEL
:
1763 return lttng_kconsumer_get_produced_snapshot(stream
, pos
);
1764 case LTTNG_CONSUMER32_UST
:
1765 case LTTNG_CONSUMER64_UST
:
1766 return lttng_ustconsumer_get_produced_snapshot(stream
, pos
);
1768 ERR("Unknown consumer_data type");
1774 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
1775 int sock
, struct pollfd
*consumer_sockpoll
)
1777 switch (consumer_data
.type
) {
1778 case LTTNG_CONSUMER_KERNEL
:
1779 return lttng_kconsumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
1780 case LTTNG_CONSUMER32_UST
:
1781 case LTTNG_CONSUMER64_UST
:
1782 return lttng_ustconsumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
1784 ERR("Unknown consumer_data type");
1791 * Iterate over all streams of the hashtable and free them properly.
1793 * WARNING: *MUST* be used with data stream only.
1795 static void destroy_data_stream_ht(struct lttng_ht
*ht
)
1797 struct lttng_ht_iter iter
;
1798 struct lttng_consumer_stream
*stream
;
1805 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1807 * Ignore return value since we are currently cleaning up so any error
1810 (void) consumer_del_stream(stream
, ht
);
1814 lttng_ht_destroy(ht
);
1818 * Iterate over all streams of the hashtable and free them properly.
1820 * XXX: Should not be only for metadata stream or else use an other name.
1822 static void destroy_stream_ht(struct lttng_ht
*ht
)
1824 struct lttng_ht_iter iter
;
1825 struct lttng_consumer_stream
*stream
;
1832 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1834 * Ignore return value since we are currently cleaning up so any error
1837 (void) consumer_del_metadata_stream(stream
, ht
);
1841 lttng_ht_destroy(ht
);
1844 void lttng_consumer_close_metadata(void)
1846 switch (consumer_data
.type
) {
1847 case LTTNG_CONSUMER_KERNEL
:
1849 * The Kernel consumer has a different metadata scheme so we don't
1850 * close anything because the stream will be closed by the session
1854 case LTTNG_CONSUMER32_UST
:
1855 case LTTNG_CONSUMER64_UST
:
1857 * Close all metadata streams. The metadata hash table is passed and
1858 * this call iterates over it by closing all wakeup fd. This is safe
1859 * because at this point we are sure that the metadata producer is
1860 * either dead or blocked.
1862 lttng_ustconsumer_close_metadata(metadata_ht
);
1865 ERR("Unknown consumer_data type");
1871 * Clean up a metadata stream and free its memory.
1873 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
1874 struct lttng_ht
*ht
)
1877 struct lttng_ht_iter iter
;
1878 struct lttng_consumer_channel
*free_chan
= NULL
;
1879 struct consumer_relayd_sock_pair
*relayd
;
1883 * This call should NEVER receive regular stream. It must always be
1884 * metadata stream and this is crucial for data structure synchronization.
1886 assert(stream
->metadata_flag
);
1888 DBG3("Consumer delete metadata stream %d", stream
->wait_fd
);
1891 /* Means the stream was allocated but not successfully added */
1892 goto free_stream_rcu
;
1895 pthread_mutex_lock(&consumer_data
.lock
);
1896 pthread_mutex_lock(&stream
->chan
->lock
);
1897 pthread_mutex_lock(&stream
->lock
);
1899 switch (consumer_data
.type
) {
1900 case LTTNG_CONSUMER_KERNEL
:
1901 if (stream
->mmap_base
!= NULL
) {
1902 ret
= munmap(stream
->mmap_base
, stream
->mmap_len
);
1904 PERROR("munmap metadata stream");
1908 if (stream
->wait_fd
>= 0) {
1909 ret
= close(stream
->wait_fd
);
1911 PERROR("close kernel metadata wait_fd");
1915 case LTTNG_CONSUMER32_UST
:
1916 case LTTNG_CONSUMER64_UST
:
1917 lttng_ustconsumer_del_stream(stream
);
1920 ERR("Unknown consumer_data type");
1926 iter
.iter
.node
= &stream
->node
.node
;
1927 ret
= lttng_ht_del(ht
, &iter
);
1930 iter
.iter
.node
= &stream
->node_channel_id
.node
;
1931 ret
= lttng_ht_del(consumer_data
.stream_per_chan_id_ht
, &iter
);
1934 iter
.iter
.node
= &stream
->node_session_id
.node
;
1935 ret
= lttng_ht_del(consumer_data
.stream_list_ht
, &iter
);
1939 if (stream
->out_fd
>= 0) {
1940 ret
= close(stream
->out_fd
);
1946 /* Check and cleanup relayd */
1948 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1949 if (relayd
!= NULL
) {
1950 uatomic_dec(&relayd
->refcount
);
1951 assert(uatomic_read(&relayd
->refcount
) >= 0);
1953 /* Closing streams requires to lock the control socket. */
1954 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1955 ret
= relayd_send_close_stream(&relayd
->control_sock
,
1956 stream
->relayd_stream_id
, stream
->next_net_seq_num
- 1);
1957 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1959 DBG("Unable to close stream on the relayd. Continuing");
1961 * Continue here. There is nothing we can do for the relayd.
1962 * Chances are that the relayd has closed the socket so we just
1963 * continue cleaning up.
1967 /* Both conditions are met, we destroy the relayd. */
1968 if (uatomic_read(&relayd
->refcount
) == 0 &&
1969 uatomic_read(&relayd
->destroy_flag
)) {
1970 destroy_relayd(relayd
);
1975 /* Atomically decrement channel refcount since other threads can use it. */
1976 if (!uatomic_sub_return(&stream
->chan
->refcount
, 1)
1977 && !uatomic_read(&stream
->chan
->nb_init_stream_left
)) {
1978 /* Go for channel deletion! */
1979 free_chan
= stream
->chan
;
1984 * Nullify the stream reference so it is not used after deletion. The
1985 * consumer data lock MUST be acquired before being able to check for a
1986 * NULL pointer value.
1988 stream
->chan
->metadata_stream
= NULL
;
1990 pthread_mutex_unlock(&stream
->lock
);
1991 pthread_mutex_unlock(&stream
->chan
->lock
);
1992 pthread_mutex_unlock(&consumer_data
.lock
);
1995 consumer_del_channel(free_chan
);
1999 call_rcu(&stream
->node
.head
, free_stream_rcu
);
2003 * Action done with the metadata stream when adding it to the consumer internal
2004 * data structures to handle it.
2006 static int add_metadata_stream(struct lttng_consumer_stream
*stream
,
2007 struct lttng_ht
*ht
)
2010 struct consumer_relayd_sock_pair
*relayd
;
2011 struct lttng_ht_iter iter
;
2012 struct lttng_ht_node_u64
*node
;
2017 DBG3("Adding metadata stream %" PRIu64
" to hash table", stream
->key
);
2019 pthread_mutex_lock(&consumer_data
.lock
);
2020 pthread_mutex_lock(&stream
->chan
->lock
);
2021 pthread_mutex_lock(&stream
->lock
);
2024 * From here, refcounts are updated so be _careful_ when returning an error
2031 * Lookup the stream just to make sure it does not exist in our internal
2032 * state. This should NEVER happen.
2034 lttng_ht_lookup(ht
, &stream
->key
, &iter
);
2035 node
= lttng_ht_iter_get_node_u64(&iter
);
2038 /* Find relayd and, if one is found, increment refcount. */
2039 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
2040 if (relayd
!= NULL
) {
2041 uatomic_inc(&relayd
->refcount
);
2045 * When nb_init_stream_left reaches 0, we don't need to trigger any action
2046 * in terms of destroying the associated channel, because the action that
2047 * causes the count to become 0 also causes a stream to be added. The
2048 * channel deletion will thus be triggered by the following removal of this
2051 if (uatomic_read(&stream
->chan
->nb_init_stream_left
) > 0) {
2052 /* Increment refcount before decrementing nb_init_stream_left */
2054 uatomic_dec(&stream
->chan
->nb_init_stream_left
);
2057 lttng_ht_add_unique_u64(ht
, &stream
->node
);
2059 lttng_ht_add_unique_u64(consumer_data
.stream_per_chan_id_ht
,
2060 &stream
->node_channel_id
);
2063 * Add stream to the stream_list_ht of the consumer data. No need to steal
2064 * the key since the HT does not use it and we allow to add redundant keys
2067 lttng_ht_add_u64(consumer_data
.stream_list_ht
, &stream
->node_session_id
);
2071 pthread_mutex_unlock(&stream
->lock
);
2072 pthread_mutex_unlock(&stream
->chan
->lock
);
2073 pthread_mutex_unlock(&consumer_data
.lock
);
2078 * Delete data stream that are flagged for deletion (endpoint_status).
2080 static void validate_endpoint_status_data_stream(void)
2082 struct lttng_ht_iter iter
;
2083 struct lttng_consumer_stream
*stream
;
2085 DBG("Consumer delete flagged data stream");
2088 cds_lfht_for_each_entry(data_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
2089 /* Validate delete flag of the stream */
2090 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_ACTIVE
) {
2093 /* Delete it right now */
2094 consumer_del_stream(stream
, data_ht
);
2100 * Delete metadata stream that are flagged for deletion (endpoint_status).
2102 static void validate_endpoint_status_metadata_stream(
2103 struct lttng_poll_event
*pollset
)
2105 struct lttng_ht_iter iter
;
2106 struct lttng_consumer_stream
*stream
;
2108 DBG("Consumer delete flagged metadata stream");
2113 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
2114 /* Validate delete flag of the stream */
2115 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_ACTIVE
) {
2119 * Remove from pollset so the metadata thread can continue without
2120 * blocking on a deleted stream.
2122 lttng_poll_del(pollset
, stream
->wait_fd
);
2124 /* Delete it right now */
2125 consumer_del_metadata_stream(stream
, metadata_ht
);
2131 * Thread polls on metadata file descriptor and write them on disk or on the
2134 void *consumer_thread_metadata_poll(void *data
)
2137 uint32_t revents
, nb_fd
;
2138 struct lttng_consumer_stream
*stream
= NULL
;
2139 struct lttng_ht_iter iter
;
2140 struct lttng_ht_node_u64
*node
;
2141 struct lttng_poll_event events
;
2142 struct lttng_consumer_local_data
*ctx
= data
;
2145 rcu_register_thread();
2147 metadata_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2149 /* ENOMEM at this point. Better to bail out. */
2153 DBG("Thread metadata poll started");
2155 /* Size is set to 1 for the consumer_metadata pipe */
2156 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2158 ERR("Poll set creation failed");
2162 ret
= lttng_poll_add(&events
,
2163 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
), LPOLLIN
);
2169 DBG("Metadata main loop started");
2172 /* Only the metadata pipe is set */
2173 if (LTTNG_POLL_GETNB(&events
) == 0 && consumer_quit
== 1) {
2178 DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events
));
2179 ret
= lttng_poll_wait(&events
, -1);
2180 DBG("Metadata event catched in thread");
2182 if (errno
== EINTR
) {
2183 ERR("Poll EINTR catched");
2191 /* From here, the event is a metadata wait fd */
2192 for (i
= 0; i
< nb_fd
; i
++) {
2193 revents
= LTTNG_POLL_GETEV(&events
, i
);
2194 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2196 /* Just don't waste time if no returned events for the fd */
2201 if (pollfd
== lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
)) {
2202 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2203 DBG("Metadata thread pipe hung up");
2205 * Remove the pipe from the poll set and continue the loop
2206 * since their might be data to consume.
2208 lttng_poll_del(&events
,
2209 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
));
2210 lttng_pipe_read_close(ctx
->consumer_metadata_pipe
);
2212 } else if (revents
& LPOLLIN
) {
2215 pipe_len
= lttng_pipe_read(ctx
->consumer_metadata_pipe
,
2216 &stream
, sizeof(stream
));
2218 ERR("read metadata stream, ret: %ld", pipe_len
);
2220 * Continue here to handle the rest of the streams.
2225 /* A NULL stream means that the state has changed. */
2226 if (stream
== NULL
) {
2227 /* Check for deleted streams. */
2228 validate_endpoint_status_metadata_stream(&events
);
2232 DBG("Adding metadata stream %d to poll set",
2235 ret
= add_metadata_stream(stream
, metadata_ht
);
2237 ERR("Unable to add metadata stream");
2238 /* Stream was not setup properly. Continuing. */
2239 consumer_del_metadata_stream(stream
, NULL
);
2243 /* Add metadata stream to the global poll events list */
2244 lttng_poll_add(&events
, stream
->wait_fd
,
2245 LPOLLIN
| LPOLLPRI
);
2248 /* Handle other stream */
2254 uint64_t tmp_id
= (uint64_t) pollfd
;
2256 lttng_ht_lookup(metadata_ht
, &tmp_id
, &iter
);
2258 node
= lttng_ht_iter_get_node_u64(&iter
);
2261 stream
= caa_container_of(node
, struct lttng_consumer_stream
,
2264 /* Check for error event */
2265 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2266 DBG("Metadata fd %d is hup|err.", pollfd
);
2267 if (!stream
->hangup_flush_done
2268 && (consumer_data
.type
== LTTNG_CONSUMER32_UST
2269 || consumer_data
.type
== LTTNG_CONSUMER64_UST
)) {
2270 DBG("Attempting to flush and consume the UST buffers");
2271 lttng_ustconsumer_on_stream_hangup(stream
);
2273 /* We just flushed the stream now read it. */
2275 len
= ctx
->on_buffer_ready(stream
, ctx
);
2277 * We don't check the return value here since if we get
2278 * a negative len, it means an error occured thus we
2279 * simply remove it from the poll set and free the
2285 lttng_poll_del(&events
, stream
->wait_fd
);
2287 * This call update the channel states, closes file descriptors
2288 * and securely free the stream.
2290 consumer_del_metadata_stream(stream
, metadata_ht
);
2291 } else if (revents
& (LPOLLIN
| LPOLLPRI
)) {
2292 /* Get the data out of the metadata file descriptor */
2293 DBG("Metadata available on fd %d", pollfd
);
2294 assert(stream
->wait_fd
== pollfd
);
2296 len
= ctx
->on_buffer_ready(stream
, ctx
);
2297 /* It's ok to have an unavailable sub-buffer */
2298 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2299 /* Clean up stream from consumer and free it. */
2300 lttng_poll_del(&events
, stream
->wait_fd
);
2301 consumer_del_metadata_stream(stream
, metadata_ht
);
2302 } else if (len
> 0) {
2303 stream
->data_read
= 1;
2307 /* Release RCU lock for the stream looked up */
2314 DBG("Metadata poll thread exiting");
2316 lttng_poll_clean(&events
);
2318 destroy_stream_ht(metadata_ht
);
2320 rcu_unregister_thread();
2325 * This thread polls the fds in the set to consume the data and write
2326 * it to tracefile if necessary.
2328 void *consumer_thread_data_poll(void *data
)
2330 int num_rdy
, num_hup
, high_prio
, ret
, i
;
2331 struct pollfd
*pollfd
= NULL
;
2332 /* local view of the streams */
2333 struct lttng_consumer_stream
**local_stream
= NULL
, *new_stream
= NULL
;
2334 /* local view of consumer_data.fds_count */
2336 struct lttng_consumer_local_data
*ctx
= data
;
2339 rcu_register_thread();
2341 data_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2342 if (data_ht
== NULL
) {
2343 /* ENOMEM at this point. Better to bail out. */
2347 local_stream
= zmalloc(sizeof(struct lttng_consumer_stream
));
2354 * the fds set has been updated, we need to update our
2355 * local array as well
2357 pthread_mutex_lock(&consumer_data
.lock
);
2358 if (consumer_data
.need_update
) {
2363 local_stream
= NULL
;
2365 /* allocate for all fds + 1 for the consumer_data_pipe */
2366 pollfd
= zmalloc((consumer_data
.stream_count
+ 1) * sizeof(struct pollfd
));
2367 if (pollfd
== NULL
) {
2368 PERROR("pollfd malloc");
2369 pthread_mutex_unlock(&consumer_data
.lock
);
2373 /* allocate for all fds + 1 for the consumer_data_pipe */
2374 local_stream
= zmalloc((consumer_data
.stream_count
+ 1) *
2375 sizeof(struct lttng_consumer_stream
*));
2376 if (local_stream
== NULL
) {
2377 PERROR("local_stream malloc");
2378 pthread_mutex_unlock(&consumer_data
.lock
);
2381 ret
= update_poll_array(ctx
, &pollfd
, local_stream
,
2384 ERR("Error in allocating pollfd or local_outfds");
2385 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
2386 pthread_mutex_unlock(&consumer_data
.lock
);
2390 consumer_data
.need_update
= 0;
2392 pthread_mutex_unlock(&consumer_data
.lock
);
2394 /* No FDs and consumer_quit, consumer_cleanup the thread */
2395 if (nb_fd
== 0 && consumer_quit
== 1) {
2398 /* poll on the array of fds */
2400 DBG("polling on %d fd", nb_fd
+ 1);
2401 num_rdy
= poll(pollfd
, nb_fd
+ 1, -1);
2402 DBG("poll num_rdy : %d", num_rdy
);
2403 if (num_rdy
== -1) {
2405 * Restart interrupted system call.
2407 if (errno
== EINTR
) {
2410 PERROR("Poll error");
2411 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
2413 } else if (num_rdy
== 0) {
2414 DBG("Polling thread timed out");
2419 * If the consumer_data_pipe triggered poll go directly to the
2420 * beginning of the loop to update the array. We want to prioritize
2421 * array update over low-priority reads.
2423 if (pollfd
[nb_fd
].revents
& (POLLIN
| POLLPRI
)) {
2424 ssize_t pipe_readlen
;
2426 DBG("consumer_data_pipe wake up");
2427 pipe_readlen
= lttng_pipe_read(ctx
->consumer_data_pipe
,
2428 &new_stream
, sizeof(new_stream
));
2429 if (pipe_readlen
< 0) {
2430 ERR("Consumer data pipe ret %ld", pipe_readlen
);
2431 /* Continue so we can at least handle the current stream(s). */
2436 * If the stream is NULL, just ignore it. It's also possible that
2437 * the sessiond poll thread changed the consumer_quit state and is
2438 * waking us up to test it.
2440 if (new_stream
== NULL
) {
2441 validate_endpoint_status_data_stream();
2445 ret
= add_stream(new_stream
, data_ht
);
2447 ERR("Consumer add stream %" PRIu64
" failed. Continuing",
2450 * At this point, if the add_stream fails, it is not in the
2451 * hash table thus passing the NULL value here.
2453 consumer_del_stream(new_stream
, NULL
);
2456 /* Continue to update the local streams and handle prio ones */
2460 /* Take care of high priority channels first. */
2461 for (i
= 0; i
< nb_fd
; i
++) {
2462 if (local_stream
[i
] == NULL
) {
2465 if (pollfd
[i
].revents
& POLLPRI
) {
2466 DBG("Urgent read on fd %d", pollfd
[i
].fd
);
2468 len
= ctx
->on_buffer_ready(local_stream
[i
], ctx
);
2469 /* it's ok to have an unavailable sub-buffer */
2470 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2471 /* Clean the stream and free it. */
2472 consumer_del_stream(local_stream
[i
], data_ht
);
2473 local_stream
[i
] = NULL
;
2474 } else if (len
> 0) {
2475 local_stream
[i
]->data_read
= 1;
2481 * If we read high prio channel in this loop, try again
2482 * for more high prio data.
2488 /* Take care of low priority channels. */
2489 for (i
= 0; i
< nb_fd
; i
++) {
2490 if (local_stream
[i
] == NULL
) {
2493 if ((pollfd
[i
].revents
& POLLIN
) ||
2494 local_stream
[i
]->hangup_flush_done
) {
2495 DBG("Normal read on fd %d", pollfd
[i
].fd
);
2496 len
= ctx
->on_buffer_ready(local_stream
[i
], ctx
);
2497 /* it's ok to have an unavailable sub-buffer */
2498 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2499 /* Clean the stream and free it. */
2500 consumer_del_stream(local_stream
[i
], data_ht
);
2501 local_stream
[i
] = NULL
;
2502 } else if (len
> 0) {
2503 local_stream
[i
]->data_read
= 1;
2508 /* Handle hangup and errors */
2509 for (i
= 0; i
< nb_fd
; i
++) {
2510 if (local_stream
[i
] == NULL
) {
2513 if (!local_stream
[i
]->hangup_flush_done
2514 && (pollfd
[i
].revents
& (POLLHUP
| POLLERR
| POLLNVAL
))
2515 && (consumer_data
.type
== LTTNG_CONSUMER32_UST
2516 || consumer_data
.type
== LTTNG_CONSUMER64_UST
)) {
2517 DBG("fd %d is hup|err|nval. Attempting flush and read.",
2519 lttng_ustconsumer_on_stream_hangup(local_stream
[i
]);
2520 /* Attempt read again, for the data we just flushed. */
2521 local_stream
[i
]->data_read
= 1;
2524 * If the poll flag is HUP/ERR/NVAL and we have
2525 * read no data in this pass, we can remove the
2526 * stream from its hash table.
2528 if ((pollfd
[i
].revents
& POLLHUP
)) {
2529 DBG("Polling fd %d tells it has hung up.", pollfd
[i
].fd
);
2530 if (!local_stream
[i
]->data_read
) {
2531 consumer_del_stream(local_stream
[i
], data_ht
);
2532 local_stream
[i
] = NULL
;
2535 } else if (pollfd
[i
].revents
& POLLERR
) {
2536 ERR("Error returned in polling fd %d.", pollfd
[i
].fd
);
2537 if (!local_stream
[i
]->data_read
) {
2538 consumer_del_stream(local_stream
[i
], data_ht
);
2539 local_stream
[i
] = NULL
;
2542 } else if (pollfd
[i
].revents
& POLLNVAL
) {
2543 ERR("Polling fd %d tells fd is not open.", pollfd
[i
].fd
);
2544 if (!local_stream
[i
]->data_read
) {
2545 consumer_del_stream(local_stream
[i
], data_ht
);
2546 local_stream
[i
] = NULL
;
2550 if (local_stream
[i
] != NULL
) {
2551 local_stream
[i
]->data_read
= 0;
2556 DBG("polling thread exiting");
2561 * Close the write side of the pipe so epoll_wait() in
2562 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2563 * read side of the pipe. If we close them both, epoll_wait strangely does
2564 * not return and could create a endless wait period if the pipe is the
2565 * only tracked fd in the poll set. The thread will take care of closing
2568 (void) lttng_pipe_write_close(ctx
->consumer_metadata_pipe
);
2570 destroy_data_stream_ht(data_ht
);
2572 rcu_unregister_thread();
2577 * Close wake-up end of each stream belonging to the channel. This will
2578 * allow the poll() on the stream read-side to detect when the
2579 * write-side (application) finally closes them.
2582 void consumer_close_channel_streams(struct lttng_consumer_channel
*channel
)
2584 struct lttng_ht
*ht
;
2585 struct lttng_consumer_stream
*stream
;
2586 struct lttng_ht_iter iter
;
2588 ht
= consumer_data
.stream_per_chan_id_ht
;
2591 cds_lfht_for_each_entry_duplicate(ht
->ht
,
2592 ht
->hash_fct(&channel
->key
, lttng_ht_seed
),
2593 ht
->match_fct
, &channel
->key
,
2594 &iter
.iter
, stream
, node_channel_id
.node
) {
2596 * Protect against teardown with mutex.
2598 pthread_mutex_lock(&stream
->lock
);
2599 if (cds_lfht_is_node_deleted(&stream
->node
.node
)) {
2602 switch (consumer_data
.type
) {
2603 case LTTNG_CONSUMER_KERNEL
:
2605 case LTTNG_CONSUMER32_UST
:
2606 case LTTNG_CONSUMER64_UST
:
2608 * Note: a mutex is taken internally within
2609 * liblttng-ust-ctl to protect timer wakeup_fd
2610 * use from concurrent close.
2612 lttng_ustconsumer_close_stream_wakeup(stream
);
2615 ERR("Unknown consumer_data type");
2619 pthread_mutex_unlock(&stream
->lock
);
2624 static void destroy_channel_ht(struct lttng_ht
*ht
)
2626 struct lttng_ht_iter iter
;
2627 struct lttng_consumer_channel
*channel
;
2635 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, channel
, wait_fd_node
.node
) {
2636 ret
= lttng_ht_del(ht
, &iter
);
2641 lttng_ht_destroy(ht
);
2645 * This thread polls the channel fds to detect when they are being
2646 * closed. It closes all related streams if the channel is detected as
2647 * closed. It is currently only used as a shim layer for UST because the
2648 * consumerd needs to keep the per-stream wakeup end of pipes open for
2651 void *consumer_thread_channel_poll(void *data
)
2654 uint32_t revents
, nb_fd
;
2655 struct lttng_consumer_channel
*chan
= NULL
;
2656 struct lttng_ht_iter iter
;
2657 struct lttng_ht_node_u64
*node
;
2658 struct lttng_poll_event events
;
2659 struct lttng_consumer_local_data
*ctx
= data
;
2660 struct lttng_ht
*channel_ht
;
2662 rcu_register_thread();
2664 channel_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2666 /* ENOMEM at this point. Better to bail out. */
2670 DBG("Thread channel poll started");
2672 /* Size is set to 1 for the consumer_channel pipe */
2673 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2675 ERR("Poll set creation failed");
2679 ret
= lttng_poll_add(&events
, ctx
->consumer_channel_pipe
[0], LPOLLIN
);
2685 DBG("Channel main loop started");
2688 /* Only the channel pipe is set */
2689 if (LTTNG_POLL_GETNB(&events
) == 0 && consumer_quit
== 1) {
2694 DBG("Channel poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events
));
2695 ret
= lttng_poll_wait(&events
, -1);
2696 DBG("Channel event catched in thread");
2698 if (errno
== EINTR
) {
2699 ERR("Poll EINTR catched");
2707 /* From here, the event is a channel wait fd */
2708 for (i
= 0; i
< nb_fd
; i
++) {
2709 revents
= LTTNG_POLL_GETEV(&events
, i
);
2710 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2712 /* Just don't waste time if no returned events for the fd */
2716 if (pollfd
== ctx
->consumer_channel_pipe
[0]) {
2717 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2718 DBG("Channel thread pipe hung up");
2720 * Remove the pipe from the poll set and continue the loop
2721 * since their might be data to consume.
2723 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
2725 } else if (revents
& LPOLLIN
) {
2726 enum consumer_channel_action action
;
2729 ret
= read_channel_pipe(ctx
, &chan
, &key
, &action
);
2731 ERR("Error reading channel pipe");
2736 case CONSUMER_CHANNEL_ADD
:
2737 DBG("Adding channel %d to poll set",
2740 lttng_ht_node_init_u64(&chan
->wait_fd_node
,
2743 lttng_ht_add_unique_u64(channel_ht
,
2744 &chan
->wait_fd_node
);
2746 /* Add channel to the global poll events list */
2747 lttng_poll_add(&events
, chan
->wait_fd
,
2748 LPOLLIN
| LPOLLPRI
);
2750 case CONSUMER_CHANNEL_DEL
:
2752 struct lttng_consumer_stream
*stream
, *stmp
;
2755 chan
= consumer_find_channel(key
);
2758 ERR("UST consumer get channel key %" PRIu64
" not found for del channel", key
);
2761 lttng_poll_del(&events
, chan
->wait_fd
);
2762 iter
.iter
.node
= &chan
->wait_fd_node
.node
;
2763 ret
= lttng_ht_del(channel_ht
, &iter
);
2765 consumer_close_channel_streams(chan
);
2767 switch (consumer_data
.type
) {
2768 case LTTNG_CONSUMER_KERNEL
:
2770 case LTTNG_CONSUMER32_UST
:
2771 case LTTNG_CONSUMER64_UST
:
2772 /* Delete streams that might have been left in the stream list. */
2773 cds_list_for_each_entry_safe(stream
, stmp
, &chan
->streams
.head
,
2775 cds_list_del(&stream
->send_node
);
2776 lttng_ustconsumer_del_stream(stream
);
2777 uatomic_sub(&stream
->chan
->refcount
, 1);
2778 assert(&chan
->refcount
);
2783 ERR("Unknown consumer_data type");
2788 * Release our own refcount. Force channel deletion even if
2789 * streams were not initialized.
2791 if (!uatomic_sub_return(&chan
->refcount
, 1)) {
2792 consumer_del_channel(chan
);
2797 case CONSUMER_CHANNEL_QUIT
:
2799 * Remove the pipe from the poll set and continue the loop
2800 * since their might be data to consume.
2802 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
2805 ERR("Unknown action");
2810 /* Handle other stream */
2816 uint64_t tmp_id
= (uint64_t) pollfd
;
2818 lttng_ht_lookup(channel_ht
, &tmp_id
, &iter
);
2820 node
= lttng_ht_iter_get_node_u64(&iter
);
2823 chan
= caa_container_of(node
, struct lttng_consumer_channel
,
2826 /* Check for error event */
2827 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2828 DBG("Channel fd %d is hup|err.", pollfd
);
2830 lttng_poll_del(&events
, chan
->wait_fd
);
2831 ret
= lttng_ht_del(channel_ht
, &iter
);
2833 assert(cds_list_empty(&chan
->streams
.head
));
2834 consumer_close_channel_streams(chan
);
2836 /* Release our own refcount */
2837 if (!uatomic_sub_return(&chan
->refcount
, 1)
2838 && !uatomic_read(&chan
->nb_init_stream_left
)) {
2839 consumer_del_channel(chan
);
2843 /* Release RCU lock for the channel looked up */
2849 lttng_poll_clean(&events
);
2851 destroy_channel_ht(channel_ht
);
2853 DBG("Channel poll thread exiting");
2854 rcu_unregister_thread();
2858 static int set_metadata_socket(struct lttng_consumer_local_data
*ctx
,
2859 struct pollfd
*sockpoll
, int client_socket
)
2866 if (lttng_consumer_poll_socket(sockpoll
) < 0) {
2870 DBG("Metadata connection on client_socket");
2872 /* Blocking call, waiting for transmission */
2873 ctx
->consumer_metadata_socket
= lttcomm_accept_unix_sock(client_socket
);
2874 if (ctx
->consumer_metadata_socket
< 0) {
2875 WARN("On accept metadata");
2886 * This thread listens on the consumerd socket and receives the file
2887 * descriptors from the session daemon.
2889 void *consumer_thread_sessiond_poll(void *data
)
2891 int sock
= -1, client_socket
, ret
;
2893 * structure to poll for incoming data on communication socket avoids
2894 * making blocking sockets.
2896 struct pollfd consumer_sockpoll
[2];
2897 struct lttng_consumer_local_data
*ctx
= data
;
2899 rcu_register_thread();
2901 DBG("Creating command socket %s", ctx
->consumer_command_sock_path
);
2902 unlink(ctx
->consumer_command_sock_path
);
2903 client_socket
= lttcomm_create_unix_sock(ctx
->consumer_command_sock_path
);
2904 if (client_socket
< 0) {
2905 ERR("Cannot create command socket");
2909 ret
= lttcomm_listen_unix_sock(client_socket
);
2914 DBG("Sending ready command to lttng-sessiond");
2915 ret
= lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
);
2916 /* return < 0 on error, but == 0 is not fatal */
2918 ERR("Error sending ready command to lttng-sessiond");
2922 /* prepare the FDs to poll : to client socket and the should_quit pipe */
2923 consumer_sockpoll
[0].fd
= ctx
->consumer_should_quit
[0];
2924 consumer_sockpoll
[0].events
= POLLIN
| POLLPRI
;
2925 consumer_sockpoll
[1].fd
= client_socket
;
2926 consumer_sockpoll
[1].events
= POLLIN
| POLLPRI
;
2928 if (lttng_consumer_poll_socket(consumer_sockpoll
) < 0) {
2931 DBG("Connection on client_socket");
2933 /* Blocking call, waiting for transmission */
2934 sock
= lttcomm_accept_unix_sock(client_socket
);
2941 * Setup metadata socket which is the second socket connection on the
2942 * command unix socket.
2944 ret
= set_metadata_socket(ctx
, consumer_sockpoll
, client_socket
);
2949 /* This socket is not useful anymore. */
2950 ret
= close(client_socket
);
2952 PERROR("close client_socket");
2956 /* update the polling structure to poll on the established socket */
2957 consumer_sockpoll
[1].fd
= sock
;
2958 consumer_sockpoll
[1].events
= POLLIN
| POLLPRI
;
2961 if (lttng_consumer_poll_socket(consumer_sockpoll
) < 0) {
2964 DBG("Incoming command on sock");
2965 ret
= lttng_consumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
2966 if (ret
== -ENOENT
) {
2967 DBG("Received STOP command");
2972 * This could simply be a session daemon quitting. Don't output
2975 DBG("Communication interrupted on command socket");
2978 if (consumer_quit
) {
2979 DBG("consumer_thread_receive_fds received quit from signal");
2982 DBG("received command on sock");
2985 DBG("Consumer thread sessiond poll exiting");
2988 * Close metadata streams since the producer is the session daemon which
2991 * NOTE: for now, this only applies to the UST tracer.
2993 lttng_consumer_close_metadata();
2996 * when all fds have hung up, the polling thread
3002 * Notify the data poll thread to poll back again and test the
3003 * consumer_quit state that we just set so to quit gracefully.
3005 notify_thread_lttng_pipe(ctx
->consumer_data_pipe
);
3007 notify_channel_pipe(ctx
, NULL
, -1, CONSUMER_CHANNEL_QUIT
);
3009 /* Cleaning up possibly open sockets. */
3013 PERROR("close sock sessiond poll");
3016 if (client_socket
>= 0) {
3017 ret
= close(client_socket
);
3019 PERROR("close client_socket sessiond poll");
3023 rcu_unregister_thread();
3027 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
3028 struct lttng_consumer_local_data
*ctx
)
3032 pthread_mutex_lock(&stream
->lock
);
3034 switch (consumer_data
.type
) {
3035 case LTTNG_CONSUMER_KERNEL
:
3036 ret
= lttng_kconsumer_read_subbuffer(stream
, ctx
);
3038 case LTTNG_CONSUMER32_UST
:
3039 case LTTNG_CONSUMER64_UST
:
3040 ret
= lttng_ustconsumer_read_subbuffer(stream
, ctx
);
3043 ERR("Unknown consumer_data type");
3049 pthread_mutex_unlock(&stream
->lock
);
3053 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
)
3055 switch (consumer_data
.type
) {
3056 case LTTNG_CONSUMER_KERNEL
:
3057 return lttng_kconsumer_on_recv_stream(stream
);
3058 case LTTNG_CONSUMER32_UST
:
3059 case LTTNG_CONSUMER64_UST
:
3060 return lttng_ustconsumer_on_recv_stream(stream
);
3062 ERR("Unknown consumer_data type");
3069 * Allocate and set consumer data hash tables.
3071 void lttng_consumer_init(void)
3073 consumer_data
.channel_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3074 consumer_data
.relayd_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3075 consumer_data
.stream_list_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3076 consumer_data
.stream_per_chan_id_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3080 * Process the ADD_RELAYD command receive by a consumer.
3082 * This will create a relayd socket pair and add it to the relayd hash table.
3083 * The caller MUST acquire a RCU read side lock before calling it.
3085 int consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
3086 struct lttng_consumer_local_data
*ctx
, int sock
,
3087 struct pollfd
*consumer_sockpoll
,
3088 struct lttcomm_relayd_sock
*relayd_sock
, uint64_t sessiond_id
)
3090 int fd
= -1, ret
= -1, relayd_created
= 0;
3091 enum lttng_error_code ret_code
= LTTNG_OK
;
3092 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3095 assert(relayd_sock
);
3097 DBG("Consumer adding relayd socket (idx: %" PRIu64
")", net_seq_idx
);
3099 /* Get relayd reference if exists. */
3100 relayd
= consumer_find_relayd(net_seq_idx
);
3101 if (relayd
== NULL
) {
3102 assert(sock_type
== LTTNG_STREAM_CONTROL
);
3103 /* Not found. Allocate one. */
3104 relayd
= consumer_allocate_relayd_sock_pair(net_seq_idx
);
3105 if (relayd
== NULL
) {
3107 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3110 relayd
->sessiond_session_id
= sessiond_id
;
3115 * This code path MUST continue to the consumer send status message to
3116 * we can notify the session daemon and continue our work without
3117 * killing everything.
3121 * relayd key should never be found for control socket.
3123 assert(sock_type
!= LTTNG_STREAM_CONTROL
);
3126 /* First send a status message before receiving the fds. */
3127 ret
= consumer_send_status_msg(sock
, LTTNG_OK
);
3129 /* Somehow, the session daemon is not responding anymore. */
3130 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3131 goto error_nosignal
;
3134 /* Poll on consumer socket. */
3135 if (lttng_consumer_poll_socket(consumer_sockpoll
) < 0) {
3136 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
3138 goto error_nosignal
;
3141 /* Get relayd socket from session daemon */
3142 ret
= lttcomm_recv_fds_unix_sock(sock
, &fd
, 1);
3143 if (ret
!= sizeof(fd
)) {
3145 fd
= -1; /* Just in case it gets set with an invalid value. */
3148 * Failing to receive FDs might indicate a major problem such as
3149 * reaching a fd limit during the receive where the kernel returns a
3150 * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we
3151 * don't take any chances and stop everything.
3153 * XXX: Feature request #558 will fix that and avoid this possible
3154 * issue when reaching the fd limit.
3156 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_ERROR_RECV_FD
);
3157 ret_code
= LTTCOMM_CONSUMERD_ERROR_RECV_FD
;
3161 /* Copy socket information and received FD */
3162 switch (sock_type
) {
3163 case LTTNG_STREAM_CONTROL
:
3164 /* Copy received lttcomm socket */
3165 lttcomm_copy_sock(&relayd
->control_sock
.sock
, &relayd_sock
->sock
);
3166 ret
= lttcomm_create_sock(&relayd
->control_sock
.sock
);
3167 /* Handle create_sock error. */
3169 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3173 * Close the socket created internally by
3174 * lttcomm_create_sock, so we can replace it by the one
3175 * received from sessiond.
3177 if (close(relayd
->control_sock
.sock
.fd
)) {
3181 /* Assign new file descriptor */
3182 relayd
->control_sock
.sock
.fd
= fd
;
3183 fd
= -1; /* For error path */
3184 /* Assign version values. */
3185 relayd
->control_sock
.major
= relayd_sock
->major
;
3186 relayd
->control_sock
.minor
= relayd_sock
->minor
;
3189 * Create a session on the relayd and store the returned id. Lock the
3190 * control socket mutex if the relayd was NOT created before.
3192 if (!relayd_created
) {
3193 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3195 ret
= relayd_create_session(&relayd
->control_sock
,
3196 &relayd
->relayd_session_id
);
3197 if (!relayd_created
) {
3198 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3202 * Close all sockets of a relayd object. It will be freed if it was
3203 * created at the error code path or else it will be garbage
3206 (void) relayd_close(&relayd
->control_sock
);
3207 (void) relayd_close(&relayd
->data_sock
);
3208 ret_code
= LTTCOMM_CONSUMERD_RELAYD_FAIL
;
3213 case LTTNG_STREAM_DATA
:
3214 /* Copy received lttcomm socket */
3215 lttcomm_copy_sock(&relayd
->data_sock
.sock
, &relayd_sock
->sock
);
3216 ret
= lttcomm_create_sock(&relayd
->data_sock
.sock
);
3217 /* Handle create_sock error. */
3219 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3223 * Close the socket created internally by
3224 * lttcomm_create_sock, so we can replace it by the one
3225 * received from sessiond.
3227 if (close(relayd
->data_sock
.sock
.fd
)) {
3231 /* Assign new file descriptor */
3232 relayd
->data_sock
.sock
.fd
= fd
;
3233 fd
= -1; /* for eventual error paths */
3234 /* Assign version values. */
3235 relayd
->data_sock
.major
= relayd_sock
->major
;
3236 relayd
->data_sock
.minor
= relayd_sock
->minor
;
3239 ERR("Unknown relayd socket type (%d)", sock_type
);
3241 ret_code
= LTTCOMM_CONSUMERD_FATAL
;
3245 DBG("Consumer %s socket created successfully with net idx %" PRIu64
" (fd: %d)",
3246 sock_type
== LTTNG_STREAM_CONTROL
? "control" : "data",
3247 relayd
->net_seq_idx
, fd
);
3249 /* We successfully added the socket. Send status back. */
3250 ret
= consumer_send_status_msg(sock
, ret_code
);
3252 /* Somehow, the session daemon is not responding anymore. */
3253 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3254 goto error_nosignal
;
3258 * Add relayd socket pair to consumer data hashtable. If object already
3259 * exists or on error, the function gracefully returns.
3267 if (consumer_send_status_msg(sock
, ret_code
) < 0) {
3268 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3272 /* Close received socket if valid. */
3275 PERROR("close received socket");
3279 if (relayd_created
) {
3287 * Try to lock the stream mutex.
3289 * On success, 1 is returned else 0 indicating that the mutex is NOT lock.
3291 static int stream_try_lock(struct lttng_consumer_stream
*stream
)
3298 * Try to lock the stream mutex. On failure, we know that the stream is
3299 * being used else where hence there is data still being extracted.
3301 ret
= pthread_mutex_trylock(&stream
->lock
);
3303 /* For both EBUSY and EINVAL error, the mutex is NOT locked. */
3315 * Search for a relayd associated to the session id and return the reference.
3317 * A rcu read side lock MUST be acquire before calling this function and locked
3318 * until the relayd object is no longer necessary.
3320 static struct consumer_relayd_sock_pair
*find_relayd_by_session_id(uint64_t id
)
3322 struct lttng_ht_iter iter
;
3323 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3325 /* Iterate over all relayd since they are indexed by net_seq_idx. */
3326 cds_lfht_for_each_entry(consumer_data
.relayd_ht
->ht
, &iter
.iter
, relayd
,
3329 * Check by sessiond id which is unique here where the relayd session
3330 * id might not be when having multiple relayd.
3332 if (relayd
->sessiond_session_id
== id
) {
3333 /* Found the relayd. There can be only one per id. */
3345 * Check if for a given session id there is still data needed to be extract
3348 * Return 1 if data is pending or else 0 meaning ready to be read.
3350 int consumer_data_pending(uint64_t id
)
3353 struct lttng_ht_iter iter
;
3354 struct lttng_ht
*ht
;
3355 struct lttng_consumer_stream
*stream
;
3356 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3357 int (*data_pending
)(struct lttng_consumer_stream
*);
3359 DBG("Consumer data pending command on session id %" PRIu64
, id
);
3362 pthread_mutex_lock(&consumer_data
.lock
);
3364 switch (consumer_data
.type
) {
3365 case LTTNG_CONSUMER_KERNEL
:
3366 data_pending
= lttng_kconsumer_data_pending
;
3368 case LTTNG_CONSUMER32_UST
:
3369 case LTTNG_CONSUMER64_UST
:
3370 data_pending
= lttng_ustconsumer_data_pending
;
3373 ERR("Unknown consumer data type");
3377 /* Ease our life a bit */
3378 ht
= consumer_data
.stream_list_ht
;
3380 relayd
= find_relayd_by_session_id(id
);
3382 /* Send init command for data pending. */
3383 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3384 ret
= relayd_begin_data_pending(&relayd
->control_sock
,
3385 relayd
->relayd_session_id
);
3386 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3388 /* Communication error thus the relayd so no data pending. */
3389 goto data_not_pending
;
3393 cds_lfht_for_each_entry_duplicate(ht
->ht
,
3394 ht
->hash_fct(&id
, lttng_ht_seed
),
3396 &iter
.iter
, stream
, node_session_id
.node
) {
3397 /* If this call fails, the stream is being used hence data pending. */
3398 ret
= stream_try_lock(stream
);
3404 * A removed node from the hash table indicates that the stream has
3405 * been deleted thus having a guarantee that the buffers are closed
3406 * on the consumer side. However, data can still be transmitted
3407 * over the network so don't skip the relayd check.
3409 ret
= cds_lfht_is_node_deleted(&stream
->node
.node
);
3411 /* Check the stream if there is data in the buffers. */
3412 ret
= data_pending(stream
);
3414 pthread_mutex_unlock(&stream
->lock
);
3421 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3422 if (stream
->metadata_flag
) {
3423 ret
= relayd_quiescent_control(&relayd
->control_sock
,
3424 stream
->relayd_stream_id
);
3426 ret
= relayd_data_pending(&relayd
->control_sock
,
3427 stream
->relayd_stream_id
,
3428 stream
->next_net_seq_num
- 1);
3430 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3432 pthread_mutex_unlock(&stream
->lock
);
3436 pthread_mutex_unlock(&stream
->lock
);
3440 unsigned int is_data_inflight
= 0;
3442 /* Send init command for data pending. */
3443 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3444 ret
= relayd_end_data_pending(&relayd
->control_sock
,
3445 relayd
->relayd_session_id
, &is_data_inflight
);
3446 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3448 goto data_not_pending
;
3450 if (is_data_inflight
) {
3456 * Finding _no_ node in the hash table and no inflight data means that the
3457 * stream(s) have been removed thus data is guaranteed to be available for
3458 * analysis from the trace files.
3462 /* Data is available to be read by a viewer. */
3463 pthread_mutex_unlock(&consumer_data
.lock
);
3468 /* Data is still being extracted from buffers. */
3469 pthread_mutex_unlock(&consumer_data
.lock
);
3475 * Send a ret code status message to the sessiond daemon.
3477 * Return the sendmsg() return value.
3479 int consumer_send_status_msg(int sock
, int ret_code
)
3481 struct lttcomm_consumer_status_msg msg
;
3483 msg
.ret_code
= ret_code
;
3485 return lttcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
3489 * Send a channel status message to the sessiond daemon.
3491 * Return the sendmsg() return value.
3493 int consumer_send_status_channel(int sock
,
3494 struct lttng_consumer_channel
*channel
)
3496 struct lttcomm_consumer_status_channel msg
;
3501 msg
.ret_code
= -LTTNG_ERR_UST_CHAN_FAIL
;
3503 msg
.ret_code
= LTTNG_OK
;
3504 msg
.key
= channel
->key
;
3505 msg
.stream_count
= channel
->streams
.count
;
3508 return lttcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));