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
);
568 * XXX naming of del vs destroy is all mixed up.
570 void consumer_del_stream_for_data(struct lttng_consumer_stream
*stream
)
572 consumer_del_stream(stream
, data_ht
);
575 void consumer_del_stream_for_metadata(struct lttng_consumer_stream
*stream
)
577 consumer_del_stream(stream
, metadata_ht
);
580 struct lttng_consumer_stream
*consumer_allocate_stream(uint64_t channel_key
,
582 enum lttng_consumer_stream_state state
,
583 const char *channel_name
,
590 enum consumer_channel_type type
)
593 struct lttng_consumer_stream
*stream
;
595 stream
= zmalloc(sizeof(*stream
));
596 if (stream
== NULL
) {
597 PERROR("malloc struct lttng_consumer_stream");
604 stream
->key
= stream_key
;
606 stream
->out_fd_offset
= 0;
607 stream
->state
= state
;
610 stream
->net_seq_idx
= relayd_id
;
611 stream
->session_id
= session_id
;
612 stream
->endpoint_status
= CONSUMER_ENDPOINT_ACTIVE
;
613 pthread_mutex_init(&stream
->lock
, NULL
);
615 /* If channel is the metadata, flag this stream as metadata. */
616 if (type
== CONSUMER_CHANNEL_TYPE_METADATA
) {
617 stream
->metadata_flag
= 1;
618 /* Metadata is flat out. */
619 strncpy(stream
->name
, DEFAULT_METADATA_NAME
, sizeof(stream
->name
));
621 /* Format stream name to <channel_name>_<cpu_number> */
622 ret
= snprintf(stream
->name
, sizeof(stream
->name
), "%s_%d",
625 PERROR("snprintf stream name");
630 /* Key is always the wait_fd for streams. */
631 lttng_ht_node_init_u64(&stream
->node
, stream
->key
);
633 /* Init node per channel id key */
634 lttng_ht_node_init_u64(&stream
->node_channel_id
, channel_key
);
636 /* Init session id node with the stream session id */
637 lttng_ht_node_init_u64(&stream
->node_session_id
, stream
->session_id
);
639 DBG3("Allocated stream %s (key %" PRIu64
", chan_key %" PRIu64
" relayd_id %" PRIu64
", session_id %" PRIu64
,
640 stream
->name
, stream
->key
, channel_key
, stream
->net_seq_idx
, stream
->session_id
);
656 * Add a stream to the global list protected by a mutex.
658 int consumer_add_data_stream(struct lttng_consumer_stream
*stream
)
660 struct lttng_ht
*ht
= data_ht
;
662 struct consumer_relayd_sock_pair
*relayd
;
667 DBG3("Adding consumer stream %" PRIu64
, stream
->key
);
669 pthread_mutex_lock(&consumer_data
.lock
);
670 pthread_mutex_lock(&stream
->chan
->lock
);
671 pthread_mutex_lock(&stream
->chan
->timer_lock
);
672 pthread_mutex_lock(&stream
->lock
);
675 /* Steal stream identifier to avoid having streams with the same key */
676 steal_stream_key(stream
->key
, ht
);
678 lttng_ht_add_unique_u64(ht
, &stream
->node
);
680 lttng_ht_add_u64(consumer_data
.stream_per_chan_id_ht
,
681 &stream
->node_channel_id
);
684 * Add stream to the stream_list_ht of the consumer data. No need to steal
685 * the key since the HT does not use it and we allow to add redundant keys
688 lttng_ht_add_u64(consumer_data
.stream_list_ht
, &stream
->node_session_id
);
690 /* Check and cleanup relayd */
691 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
692 if (relayd
!= NULL
) {
693 uatomic_inc(&relayd
->refcount
);
697 * When nb_init_stream_left reaches 0, we don't need to trigger any action
698 * in terms of destroying the associated channel, because the action that
699 * causes the count to become 0 also causes a stream to be added. The
700 * channel deletion will thus be triggered by the following removal of this
703 if (uatomic_read(&stream
->chan
->nb_init_stream_left
) > 0) {
704 /* Increment refcount before decrementing nb_init_stream_left */
706 uatomic_dec(&stream
->chan
->nb_init_stream_left
);
709 /* Update consumer data once the node is inserted. */
710 consumer_data
.stream_count
++;
711 consumer_data
.need_update
= 1;
714 pthread_mutex_unlock(&stream
->lock
);
715 pthread_mutex_unlock(&stream
->chan
->timer_lock
);
716 pthread_mutex_unlock(&stream
->chan
->lock
);
717 pthread_mutex_unlock(&consumer_data
.lock
);
722 void consumer_del_data_stream(struct lttng_consumer_stream
*stream
)
724 consumer_del_stream(stream
, data_ht
);
728 * Add relayd socket to global consumer data hashtable. RCU read side lock MUST
729 * be acquired before calling this.
731 static int add_relayd(struct consumer_relayd_sock_pair
*relayd
)
734 struct lttng_ht_node_u64
*node
;
735 struct lttng_ht_iter iter
;
739 lttng_ht_lookup(consumer_data
.relayd_ht
,
740 &relayd
->net_seq_idx
, &iter
);
741 node
= lttng_ht_iter_get_node_u64(&iter
);
745 lttng_ht_add_unique_u64(consumer_data
.relayd_ht
, &relayd
->node
);
752 * Allocate and return a consumer relayd socket.
754 struct consumer_relayd_sock_pair
*consumer_allocate_relayd_sock_pair(
755 uint64_t net_seq_idx
)
757 struct consumer_relayd_sock_pair
*obj
= NULL
;
759 /* net sequence index of -1 is a failure */
760 if (net_seq_idx
== (uint64_t) -1ULL) {
764 obj
= zmalloc(sizeof(struct consumer_relayd_sock_pair
));
766 PERROR("zmalloc relayd sock");
770 obj
->net_seq_idx
= net_seq_idx
;
772 obj
->destroy_flag
= 0;
773 obj
->control_sock
.sock
.fd
= -1;
774 obj
->data_sock
.sock
.fd
= -1;
775 lttng_ht_node_init_u64(&obj
->node
, obj
->net_seq_idx
);
776 pthread_mutex_init(&obj
->ctrl_sock_mutex
, NULL
);
783 * Find a relayd socket pair in the global consumer data.
785 * Return the object if found else NULL.
786 * RCU read-side lock must be held across this call and while using the
789 struct consumer_relayd_sock_pair
*consumer_find_relayd(uint64_t key
)
791 struct lttng_ht_iter iter
;
792 struct lttng_ht_node_u64
*node
;
793 struct consumer_relayd_sock_pair
*relayd
= NULL
;
795 /* Negative keys are lookup failures */
796 if (key
== (uint64_t) -1ULL) {
800 lttng_ht_lookup(consumer_data
.relayd_ht
, &key
,
802 node
= lttng_ht_iter_get_node_u64(&iter
);
804 relayd
= caa_container_of(node
, struct consumer_relayd_sock_pair
, node
);
812 * Handle stream for relayd transmission if the stream applies for network
813 * streaming where the net sequence index is set.
815 * Return destination file descriptor or negative value on error.
817 static int write_relayd_stream_header(struct lttng_consumer_stream
*stream
,
818 size_t data_size
, unsigned long padding
,
819 struct consumer_relayd_sock_pair
*relayd
)
822 struct lttcomm_relayd_data_hdr data_hdr
;
828 /* Reset data header */
829 memset(&data_hdr
, 0, sizeof(data_hdr
));
831 if (stream
->metadata_flag
) {
832 /* Caller MUST acquire the relayd control socket lock */
833 ret
= relayd_send_metadata(&relayd
->control_sock
, data_size
);
838 /* Metadata are always sent on the control socket. */
839 outfd
= relayd
->control_sock
.sock
.fd
;
841 /* Set header with stream information */
842 data_hdr
.stream_id
= htobe64(stream
->relayd_stream_id
);
843 data_hdr
.data_size
= htobe32(data_size
);
844 data_hdr
.padding_size
= htobe32(padding
);
846 * Note that net_seq_num below is assigned with the *current* value of
847 * next_net_seq_num and only after that the next_net_seq_num will be
848 * increment. This is why when issuing a command on the relayd using
849 * this next value, 1 should always be substracted in order to compare
850 * the last seen sequence number on the relayd side to the last sent.
852 data_hdr
.net_seq_num
= htobe64(stream
->next_net_seq_num
);
853 /* Other fields are zeroed previously */
855 ret
= relayd_send_data_hdr(&relayd
->data_sock
, &data_hdr
,
861 ++stream
->next_net_seq_num
;
863 /* Set to go on data socket */
864 outfd
= relayd
->data_sock
.sock
.fd
;
872 * Allocate and return a new lttng_consumer_channel object using the given key
873 * to initialize the hash table node.
875 * On error, return NULL.
877 struct lttng_consumer_channel
*consumer_allocate_channel(uint64_t key
,
879 const char *pathname
,
884 enum lttng_event_output output
,
885 uint64_t tracefile_size
,
886 uint64_t tracefile_count
,
887 uint64_t session_id_per_pid
)
889 struct lttng_consumer_channel
*channel
;
891 channel
= zmalloc(sizeof(*channel
));
892 if (channel
== NULL
) {
893 PERROR("malloc struct lttng_consumer_channel");
898 channel
->refcount
= 0;
899 channel
->session_id
= session_id
;
900 channel
->session_id_per_pid
= session_id_per_pid
;
903 channel
->relayd_id
= relayd_id
;
904 channel
->output
= output
;
905 channel
->tracefile_size
= tracefile_size
;
906 channel
->tracefile_count
= tracefile_count
;
907 pthread_mutex_init(&channel
->lock
, NULL
);
908 pthread_mutex_init(&channel
->timer_lock
, NULL
);
910 strncpy(channel
->pathname
, pathname
, sizeof(channel
->pathname
));
911 channel
->pathname
[sizeof(channel
->pathname
) - 1] = '\0';
913 strncpy(channel
->name
, name
, sizeof(channel
->name
));
914 channel
->name
[sizeof(channel
->name
) - 1] = '\0';
916 lttng_ht_node_init_u64(&channel
->node
, channel
->key
);
918 channel
->wait_fd
= -1;
920 CDS_INIT_LIST_HEAD(&channel
->streams
.head
);
922 DBG("Allocated channel (key %" PRIu64
")", channel
->key
)
929 * Add a channel to the global list protected by a mutex.
931 * On success 0 is returned else a negative value.
933 int consumer_add_channel(struct lttng_consumer_channel
*channel
,
934 struct lttng_consumer_local_data
*ctx
)
937 struct lttng_ht_node_u64
*node
;
938 struct lttng_ht_iter iter
;
940 pthread_mutex_lock(&consumer_data
.lock
);
941 pthread_mutex_lock(&channel
->lock
);
942 pthread_mutex_lock(&channel
->timer_lock
);
945 lttng_ht_lookup(consumer_data
.channel_ht
, &channel
->key
, &iter
);
946 node
= lttng_ht_iter_get_node_u64(&iter
);
948 /* Channel already exist. Ignore the insertion */
949 ERR("Consumer add channel key %" PRIu64
" already exists!",
955 lttng_ht_add_unique_u64(consumer_data
.channel_ht
, &channel
->node
);
959 pthread_mutex_unlock(&channel
->timer_lock
);
960 pthread_mutex_unlock(&channel
->lock
);
961 pthread_mutex_unlock(&consumer_data
.lock
);
963 if (!ret
&& channel
->wait_fd
!= -1 &&
964 channel
->metadata_stream
== NULL
) {
965 notify_channel_pipe(ctx
, channel
, -1, CONSUMER_CHANNEL_ADD
);
971 * Allocate the pollfd structure and the local view of the out fds to avoid
972 * doing a lookup in the linked list and concurrency issues when writing is
973 * needed. Called with consumer_data.lock held.
975 * Returns the number of fds in the structures.
977 static int update_poll_array(struct lttng_consumer_local_data
*ctx
,
978 struct pollfd
**pollfd
, struct lttng_consumer_stream
**local_stream
,
982 struct lttng_ht_iter iter
;
983 struct lttng_consumer_stream
*stream
;
988 assert(local_stream
);
990 DBG("Updating poll fd array");
992 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
994 * Only active streams with an active end point can be added to the
995 * poll set and local stream storage of the thread.
997 * There is a potential race here for endpoint_status to be updated
998 * just after the check. However, this is OK since the stream(s) will
999 * be deleted once the thread is notified that the end point state has
1000 * changed where this function will be called back again.
1002 if (stream
->state
!= LTTNG_CONSUMER_ACTIVE_STREAM
||
1003 stream
->endpoint_status
== CONSUMER_ENDPOINT_INACTIVE
) {
1007 * This clobbers way too much the debug output. Uncomment that if you
1008 * need it for debugging purposes.
1010 * DBG("Active FD %d", stream->wait_fd);
1012 (*pollfd
)[i
].fd
= stream
->wait_fd
;
1013 (*pollfd
)[i
].events
= POLLIN
| POLLPRI
;
1014 local_stream
[i
] = stream
;
1020 * Insert the consumer_data_pipe at the end of the array and don't
1021 * increment i so nb_fd is the number of real FD.
1023 (*pollfd
)[i
].fd
= lttng_pipe_get_readfd(ctx
->consumer_data_pipe
);
1024 (*pollfd
)[i
].events
= POLLIN
| POLLPRI
;
1029 * Poll on the should_quit pipe and the command socket return -1 on error and
1030 * should exit, 0 if data is available on the command socket
1032 int lttng_consumer_poll_socket(struct pollfd
*consumer_sockpoll
)
1037 num_rdy
= poll(consumer_sockpoll
, 2, -1);
1038 if (num_rdy
== -1) {
1040 * Restart interrupted system call.
1042 if (errno
== EINTR
) {
1045 PERROR("Poll error");
1048 if (consumer_sockpoll
[0].revents
& (POLLIN
| POLLPRI
)) {
1049 DBG("consumer_should_quit wake up");
1059 * Set the error socket.
1061 void lttng_consumer_set_error_sock(struct lttng_consumer_local_data
*ctx
,
1064 ctx
->consumer_error_socket
= sock
;
1068 * Set the command socket path.
1070 void lttng_consumer_set_command_sock_path(
1071 struct lttng_consumer_local_data
*ctx
, char *sock
)
1073 ctx
->consumer_command_sock_path
= sock
;
1077 * Send return code to the session daemon.
1078 * If the socket is not defined, we return 0, it is not a fatal error
1080 int lttng_consumer_send_error(struct lttng_consumer_local_data
*ctx
, int cmd
)
1082 if (ctx
->consumer_error_socket
> 0) {
1083 return lttcomm_send_unix_sock(ctx
->consumer_error_socket
, &cmd
,
1084 sizeof(enum lttcomm_sessiond_command
));
1091 * Close all the tracefiles and stream fds and MUST be called when all
1092 * instances are destroyed i.e. when all threads were joined and are ended.
1094 void lttng_consumer_cleanup(void)
1096 struct lttng_ht_iter iter
;
1097 struct lttng_consumer_channel
*channel
;
1101 cds_lfht_for_each_entry(consumer_data
.channel_ht
->ht
, &iter
.iter
, channel
,
1103 consumer_del_channel(channel
);
1108 lttng_ht_destroy(consumer_data
.channel_ht
);
1110 cleanup_relayd_ht();
1112 lttng_ht_destroy(consumer_data
.stream_per_chan_id_ht
);
1115 * This HT contains streams that are freed by either the metadata thread or
1116 * the data thread so we do *nothing* on the hash table and simply destroy
1119 lttng_ht_destroy(consumer_data
.stream_list_ht
);
1123 * Called from signal handler.
1125 void lttng_consumer_should_exit(struct lttng_consumer_local_data
*ctx
)
1130 ret
= write(ctx
->consumer_should_quit
[1], "4", 1);
1131 } while (ret
< 0 && errno
== EINTR
);
1132 if (ret
< 0 || ret
!= 1) {
1133 PERROR("write consumer quit");
1136 DBG("Consumer flag that it should quit");
1139 void lttng_consumer_sync_trace_file(struct lttng_consumer_stream
*stream
,
1142 int outfd
= stream
->out_fd
;
1145 * This does a blocking write-and-wait on any page that belongs to the
1146 * subbuffer prior to the one we just wrote.
1147 * Don't care about error values, as these are just hints and ways to
1148 * limit the amount of page cache used.
1150 if (orig_offset
< stream
->max_sb_size
) {
1153 lttng_sync_file_range(outfd
, orig_offset
- stream
->max_sb_size
,
1154 stream
->max_sb_size
,
1155 SYNC_FILE_RANGE_WAIT_BEFORE
1156 | SYNC_FILE_RANGE_WRITE
1157 | SYNC_FILE_RANGE_WAIT_AFTER
);
1159 * Give hints to the kernel about how we access the file:
1160 * POSIX_FADV_DONTNEED : we won't re-access data in a near future after
1163 * We need to call fadvise again after the file grows because the
1164 * kernel does not seem to apply fadvise to non-existing parts of the
1167 * Call fadvise _after_ having waited for the page writeback to
1168 * complete because the dirty page writeback semantic is not well
1169 * defined. So it can be expected to lead to lower throughput in
1172 posix_fadvise(outfd
, orig_offset
- stream
->max_sb_size
,
1173 stream
->max_sb_size
, POSIX_FADV_DONTNEED
);
1177 * Initialise the necessary environnement :
1178 * - create a new context
1179 * - create the poll_pipe
1180 * - create the should_quit pipe (for signal handler)
1181 * - create the thread pipe (for splice)
1183 * Takes a function pointer as argument, this function is called when data is
1184 * available on a buffer. This function is responsible to do the
1185 * kernctl_get_next_subbuf, read the data with mmap or splice depending on the
1186 * buffer configuration and then kernctl_put_next_subbuf at the end.
1188 * Returns a pointer to the new context or NULL on error.
1190 struct lttng_consumer_local_data
*lttng_consumer_create(
1191 enum lttng_consumer_type type
,
1192 ssize_t (*buffer_ready
)(struct lttng_consumer_stream
*stream
,
1193 struct lttng_consumer_local_data
*ctx
),
1194 int (*recv_channel
)(struct lttng_consumer_channel
*channel
),
1195 int (*recv_stream
)(struct lttng_consumer_stream
*stream
),
1196 int (*update_stream
)(uint64_t stream_key
, uint32_t state
))
1199 struct lttng_consumer_local_data
*ctx
;
1201 assert(consumer_data
.type
== LTTNG_CONSUMER_UNKNOWN
||
1202 consumer_data
.type
== type
);
1203 consumer_data
.type
= type
;
1205 ctx
= zmalloc(sizeof(struct lttng_consumer_local_data
));
1207 PERROR("allocating context");
1211 ctx
->consumer_error_socket
= -1;
1212 ctx
->consumer_metadata_socket
= -1;
1213 /* assign the callbacks */
1214 ctx
->on_buffer_ready
= buffer_ready
;
1215 ctx
->on_recv_channel
= recv_channel
;
1216 ctx
->on_recv_stream
= recv_stream
;
1217 ctx
->on_update_stream
= update_stream
;
1219 ctx
->consumer_data_pipe
= lttng_pipe_open(0);
1220 if (!ctx
->consumer_data_pipe
) {
1221 goto error_poll_pipe
;
1224 ret
= pipe(ctx
->consumer_should_quit
);
1226 PERROR("Error creating recv pipe");
1227 goto error_quit_pipe
;
1230 ret
= pipe(ctx
->consumer_thread_pipe
);
1232 PERROR("Error creating thread pipe");
1233 goto error_thread_pipe
;
1236 ret
= pipe(ctx
->consumer_channel_pipe
);
1238 PERROR("Error creating channel pipe");
1239 goto error_channel_pipe
;
1242 ctx
->consumer_metadata_pipe
= lttng_pipe_open(0);
1243 if (!ctx
->consumer_metadata_pipe
) {
1244 goto error_metadata_pipe
;
1247 ret
= utils_create_pipe(ctx
->consumer_splice_metadata_pipe
);
1249 goto error_splice_pipe
;
1255 lttng_pipe_destroy(ctx
->consumer_metadata_pipe
);
1256 error_metadata_pipe
:
1257 utils_close_pipe(ctx
->consumer_channel_pipe
);
1259 utils_close_pipe(ctx
->consumer_thread_pipe
);
1261 utils_close_pipe(ctx
->consumer_should_quit
);
1263 lttng_pipe_destroy(ctx
->consumer_data_pipe
);
1271 * Close all fds associated with the instance and free the context.
1273 void lttng_consumer_destroy(struct lttng_consumer_local_data
*ctx
)
1277 DBG("Consumer destroying it. Closing everything.");
1279 ret
= close(ctx
->consumer_error_socket
);
1283 ret
= close(ctx
->consumer_metadata_socket
);
1287 utils_close_pipe(ctx
->consumer_thread_pipe
);
1288 utils_close_pipe(ctx
->consumer_channel_pipe
);
1289 lttng_pipe_destroy(ctx
->consumer_data_pipe
);
1290 lttng_pipe_destroy(ctx
->consumer_metadata_pipe
);
1291 utils_close_pipe(ctx
->consumer_should_quit
);
1292 utils_close_pipe(ctx
->consumer_splice_metadata_pipe
);
1294 unlink(ctx
->consumer_command_sock_path
);
1299 * Write the metadata stream id on the specified file descriptor.
1301 static int write_relayd_metadata_id(int fd
,
1302 struct lttng_consumer_stream
*stream
,
1303 struct consumer_relayd_sock_pair
*relayd
, unsigned long padding
)
1306 struct lttcomm_relayd_metadata_payload hdr
;
1308 hdr
.stream_id
= htobe64(stream
->relayd_stream_id
);
1309 hdr
.padding_size
= htobe32(padding
);
1311 ret
= write(fd
, (void *) &hdr
, sizeof(hdr
));
1312 } while (ret
< 0 && errno
== EINTR
);
1313 if (ret
< 0 || ret
!= sizeof(hdr
)) {
1315 * This error means that the fd's end is closed so ignore the perror
1316 * not to clubber the error output since this can happen in a normal
1319 if (errno
!= EPIPE
) {
1320 PERROR("write metadata stream id");
1322 DBG3("Consumer failed to write relayd metadata id (errno: %d)", errno
);
1324 * Set ret to a negative value because if ret != sizeof(hdr), we don't
1325 * handle writting the missing part so report that as an error and
1326 * don't lie to the caller.
1331 DBG("Metadata stream id %" PRIu64
" with padding %lu written before data",
1332 stream
->relayd_stream_id
, padding
);
1339 * Mmap the ring buffer, read it and write the data to the tracefile. This is a
1340 * core function for writing trace buffers to either the local filesystem or
1343 * It must be called with the stream lock held.
1345 * Careful review MUST be put if any changes occur!
1347 * Returns the number of bytes written
1349 ssize_t
lttng_consumer_on_read_subbuffer_mmap(
1350 struct lttng_consumer_local_data
*ctx
,
1351 struct lttng_consumer_stream
*stream
, unsigned long len
,
1352 unsigned long padding
)
1354 unsigned long mmap_offset
;
1356 ssize_t ret
= 0, written
= 0;
1357 off_t orig_offset
= stream
->out_fd_offset
;
1358 /* Default is on the disk */
1359 int outfd
= stream
->out_fd
;
1360 struct consumer_relayd_sock_pair
*relayd
= NULL
;
1361 unsigned int relayd_hang_up
= 0;
1363 /* RCU lock for the relayd pointer */
1366 /* Flag that the current stream if set for network streaming. */
1367 if (stream
->net_seq_idx
!= (uint64_t) -1ULL) {
1368 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1369 if (relayd
== NULL
) {
1375 /* get the offset inside the fd to mmap */
1376 switch (consumer_data
.type
) {
1377 case LTTNG_CONSUMER_KERNEL
:
1378 mmap_base
= stream
->mmap_base
;
1379 ret
= kernctl_get_mmap_read_offset(stream
->wait_fd
, &mmap_offset
);
1381 PERROR("tracer ctl get_mmap_read_offset");
1386 case LTTNG_CONSUMER32_UST
:
1387 case LTTNG_CONSUMER64_UST
:
1388 mmap_base
= lttng_ustctl_get_mmap_base(stream
);
1390 ERR("read mmap get mmap base for stream %s", stream
->name
);
1394 ret
= lttng_ustctl_get_mmap_read_offset(stream
, &mmap_offset
);
1396 PERROR("tracer ctl get_mmap_read_offset");
1402 ERR("Unknown consumer_data type");
1406 /* Handle stream on the relayd if the output is on the network */
1408 unsigned long netlen
= len
;
1411 * Lock the control socket for the complete duration of the function
1412 * since from this point on we will use the socket.
1414 if (stream
->metadata_flag
) {
1415 /* Metadata requires the control socket. */
1416 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1417 netlen
+= sizeof(struct lttcomm_relayd_metadata_payload
);
1420 ret
= write_relayd_stream_header(stream
, netlen
, padding
, relayd
);
1422 /* Use the returned socket. */
1425 /* Write metadata stream id before payload */
1426 if (stream
->metadata_flag
) {
1427 ret
= write_relayd_metadata_id(outfd
, stream
, relayd
, padding
);
1430 /* Socket operation failed. We consider the relayd dead */
1431 if (ret
== -EPIPE
|| ret
== -EINVAL
) {
1439 /* Socket operation failed. We consider the relayd dead */
1440 if (ret
== -EPIPE
|| ret
== -EINVAL
) {
1444 /* Else, use the default set before which is the filesystem. */
1447 /* No streaming, we have to set the len with the full padding */
1451 * Check if we need to change the tracefile before writing the packet.
1453 if (stream
->chan
->tracefile_size
> 0 &&
1454 (stream
->tracefile_size_current
+ len
) >
1455 stream
->chan
->tracefile_size
) {
1456 ret
= utils_rotate_stream_file(stream
->chan
->pathname
,
1457 stream
->name
, stream
->chan
->tracefile_size
,
1458 stream
->chan
->tracefile_count
, stream
->uid
, stream
->gid
,
1459 stream
->out_fd
, &(stream
->tracefile_count_current
));
1461 ERR("Rotating output file");
1464 outfd
= stream
->out_fd
= ret
;
1465 /* Reset current size because we just perform a rotation. */
1466 stream
->tracefile_size_current
= 0;
1467 stream
->out_fd_offset
= 0;
1470 stream
->tracefile_size_current
+= len
;
1475 ret
= write(outfd
, mmap_base
+ mmap_offset
, len
);
1476 } while (ret
< 0 && errno
== EINTR
);
1477 DBG("Consumer mmap write() ret %zd (len %lu)", ret
, len
);
1480 * This is possible if the fd is closed on the other side (outfd)
1481 * or any write problem. It can be verbose a bit for a normal
1482 * execution if for instance the relayd is stopped abruptly. This
1483 * can happen so set this to a DBG statement.
1485 DBG("Error in file write mmap");
1489 /* Socket operation failed. We consider the relayd dead */
1490 if (errno
== EPIPE
|| errno
== EINVAL
) {
1495 } else if (ret
> len
) {
1496 PERROR("Error in file write (ret %zd > len %lu)", ret
, len
);
1504 /* This call is useless on a socket so better save a syscall. */
1506 /* This won't block, but will start writeout asynchronously */
1507 lttng_sync_file_range(outfd
, stream
->out_fd_offset
, ret
,
1508 SYNC_FILE_RANGE_WRITE
);
1509 stream
->out_fd_offset
+= ret
;
1513 lttng_consumer_sync_trace_file(stream
, orig_offset
);
1517 * This is a special case that the relayd has closed its socket. Let's
1518 * cleanup the relayd object and all associated streams.
1520 if (relayd
&& relayd_hang_up
) {
1521 cleanup_relayd(relayd
, ctx
);
1525 /* Unlock only if ctrl socket used */
1526 if (relayd
&& stream
->metadata_flag
) {
1527 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1535 * Splice the data from the ring buffer to the tracefile.
1537 * It must be called with the stream lock held.
1539 * Returns the number of bytes spliced.
1541 ssize_t
lttng_consumer_on_read_subbuffer_splice(
1542 struct lttng_consumer_local_data
*ctx
,
1543 struct lttng_consumer_stream
*stream
, unsigned long len
,
1544 unsigned long padding
)
1546 ssize_t ret
= 0, written
= 0, ret_splice
= 0;
1548 off_t orig_offset
= stream
->out_fd_offset
;
1549 int fd
= stream
->wait_fd
;
1550 /* Default is on the disk */
1551 int outfd
= stream
->out_fd
;
1552 struct consumer_relayd_sock_pair
*relayd
= NULL
;
1554 unsigned int relayd_hang_up
= 0;
1556 switch (consumer_data
.type
) {
1557 case LTTNG_CONSUMER_KERNEL
:
1559 case LTTNG_CONSUMER32_UST
:
1560 case LTTNG_CONSUMER64_UST
:
1561 /* Not supported for user space tracing */
1564 ERR("Unknown consumer_data type");
1568 /* RCU lock for the relayd pointer */
1571 /* Flag that the current stream if set for network streaming. */
1572 if (stream
->net_seq_idx
!= (uint64_t) -1ULL) {
1573 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1574 if (relayd
== NULL
) {
1581 * Choose right pipe for splice. Metadata and trace data are handled by
1582 * different threads hence the use of two pipes in order not to race or
1583 * corrupt the written data.
1585 if (stream
->metadata_flag
) {
1586 splice_pipe
= ctx
->consumer_splice_metadata_pipe
;
1588 splice_pipe
= ctx
->consumer_thread_pipe
;
1591 /* Write metadata stream id before payload */
1593 int total_len
= len
;
1595 if (stream
->metadata_flag
) {
1597 * Lock the control socket for the complete duration of the function
1598 * since from this point on we will use the socket.
1600 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1602 ret
= write_relayd_metadata_id(splice_pipe
[1], stream
, relayd
,
1606 /* Socket operation failed. We consider the relayd dead */
1607 if (ret
== -EBADF
) {
1608 WARN("Remote relayd disconnected. Stopping");
1615 total_len
+= sizeof(struct lttcomm_relayd_metadata_payload
);
1618 ret
= write_relayd_stream_header(stream
, total_len
, padding
, relayd
);
1620 /* Use the returned socket. */
1623 /* Socket operation failed. We consider the relayd dead */
1624 if (ret
== -EBADF
) {
1625 WARN("Remote relayd disconnected. Stopping");
1632 /* No streaming, we have to set the len with the full padding */
1636 * Check if we need to change the tracefile before writing the packet.
1638 if (stream
->chan
->tracefile_size
> 0 &&
1639 (stream
->tracefile_size_current
+ len
) >
1640 stream
->chan
->tracefile_size
) {
1641 ret
= utils_rotate_stream_file(stream
->chan
->pathname
,
1642 stream
->name
, stream
->chan
->tracefile_size
,
1643 stream
->chan
->tracefile_count
, stream
->uid
, stream
->gid
,
1644 stream
->out_fd
, &(stream
->tracefile_count_current
));
1646 ERR("Rotating output file");
1649 outfd
= stream
->out_fd
= ret
;
1650 /* Reset current size because we just perform a rotation. */
1651 stream
->tracefile_size_current
= 0;
1652 stream
->out_fd_offset
= 0;
1655 stream
->tracefile_size_current
+= len
;
1659 DBG("splice chan to pipe offset %lu of len %lu (fd : %d, pipe: %d)",
1660 (unsigned long)offset
, len
, fd
, splice_pipe
[1]);
1661 ret_splice
= splice(fd
, &offset
, splice_pipe
[1], NULL
, len
,
1662 SPLICE_F_MOVE
| SPLICE_F_MORE
);
1663 DBG("splice chan to pipe, ret %zd", ret_splice
);
1664 if (ret_splice
< 0) {
1665 PERROR("Error in relay splice");
1667 written
= ret_splice
;
1673 /* Handle stream on the relayd if the output is on the network */
1675 if (stream
->metadata_flag
) {
1676 size_t metadata_payload_size
=
1677 sizeof(struct lttcomm_relayd_metadata_payload
);
1679 /* Update counter to fit the spliced data */
1680 ret_splice
+= metadata_payload_size
;
1681 len
+= metadata_payload_size
;
1683 * We do this so the return value can match the len passed as
1684 * argument to this function.
1686 written
-= metadata_payload_size
;
1690 /* Splice data out */
1691 ret_splice
= splice(splice_pipe
[0], NULL
, outfd
, NULL
,
1692 ret_splice
, SPLICE_F_MOVE
| SPLICE_F_MORE
);
1693 DBG("Consumer splice pipe to file, ret %zd", ret_splice
);
1694 if (ret_splice
< 0) {
1695 PERROR("Error in file splice");
1697 written
= ret_splice
;
1699 /* Socket operation failed. We consider the relayd dead */
1700 if (errno
== EBADF
|| errno
== EPIPE
) {
1701 WARN("Remote relayd disconnected. Stopping");
1707 } else if (ret_splice
> len
) {
1709 PERROR("Wrote more data than requested %zd (len: %lu)",
1711 written
+= ret_splice
;
1717 /* This call is useless on a socket so better save a syscall. */
1719 /* This won't block, but will start writeout asynchronously */
1720 lttng_sync_file_range(outfd
, stream
->out_fd_offset
, ret_splice
,
1721 SYNC_FILE_RANGE_WRITE
);
1722 stream
->out_fd_offset
+= ret_splice
;
1724 written
+= ret_splice
;
1726 lttng_consumer_sync_trace_file(stream
, orig_offset
);
1734 * This is a special case that the relayd has closed its socket. Let's
1735 * cleanup the relayd object and all associated streams.
1737 if (relayd
&& relayd_hang_up
) {
1738 cleanup_relayd(relayd
, ctx
);
1739 /* Skip splice error so the consumer does not fail */
1744 /* send the appropriate error description to sessiond */
1747 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_EINVAL
);
1750 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_ENOMEM
);
1753 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_SPLICE_ESPIPE
);
1758 if (relayd
&& stream
->metadata_flag
) {
1759 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1767 * Take a snapshot for a specific fd
1769 * Returns 0 on success, < 0 on error
1771 int lttng_consumer_take_snapshot(struct lttng_consumer_stream
*stream
)
1773 switch (consumer_data
.type
) {
1774 case LTTNG_CONSUMER_KERNEL
:
1775 return lttng_kconsumer_take_snapshot(stream
);
1776 case LTTNG_CONSUMER32_UST
:
1777 case LTTNG_CONSUMER64_UST
:
1778 return lttng_ustconsumer_take_snapshot(stream
);
1780 ERR("Unknown consumer_data type");
1787 * Get the produced position
1789 * Returns 0 on success, < 0 on error
1791 int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream
*stream
,
1794 switch (consumer_data
.type
) {
1795 case LTTNG_CONSUMER_KERNEL
:
1796 return lttng_kconsumer_get_produced_snapshot(stream
, pos
);
1797 case LTTNG_CONSUMER32_UST
:
1798 case LTTNG_CONSUMER64_UST
:
1799 return lttng_ustconsumer_get_produced_snapshot(stream
, pos
);
1801 ERR("Unknown consumer_data type");
1807 int lttng_consumer_recv_cmd(struct lttng_consumer_local_data
*ctx
,
1808 int sock
, struct pollfd
*consumer_sockpoll
)
1810 switch (consumer_data
.type
) {
1811 case LTTNG_CONSUMER_KERNEL
:
1812 return lttng_kconsumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
1813 case LTTNG_CONSUMER32_UST
:
1814 case LTTNG_CONSUMER64_UST
:
1815 return lttng_ustconsumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
1817 ERR("Unknown consumer_data type");
1824 * Iterate over all streams of the hashtable and free them properly.
1826 * WARNING: *MUST* be used with data stream only.
1828 static void destroy_data_stream_ht(struct lttng_ht
*ht
)
1830 struct lttng_ht_iter iter
;
1831 struct lttng_consumer_stream
*stream
;
1838 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1840 * Ignore return value since we are currently cleaning up so any error
1843 (void) consumer_del_stream(stream
, ht
);
1847 lttng_ht_destroy(ht
);
1851 * Iterate over all streams of the hashtable and free them properly.
1853 * XXX: Should not be only for metadata stream or else use an other name.
1855 static void destroy_stream_ht(struct lttng_ht
*ht
)
1857 struct lttng_ht_iter iter
;
1858 struct lttng_consumer_stream
*stream
;
1865 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, stream
, node
.node
) {
1867 * Ignore return value since we are currently cleaning up so any error
1870 (void) consumer_del_metadata_stream(stream
, ht
);
1874 lttng_ht_destroy(ht
);
1877 void lttng_consumer_close_metadata(void)
1879 switch (consumer_data
.type
) {
1880 case LTTNG_CONSUMER_KERNEL
:
1882 * The Kernel consumer has a different metadata scheme so we don't
1883 * close anything because the stream will be closed by the session
1887 case LTTNG_CONSUMER32_UST
:
1888 case LTTNG_CONSUMER64_UST
:
1890 * Close all metadata streams. The metadata hash table is passed and
1891 * this call iterates over it by closing all wakeup fd. This is safe
1892 * because at this point we are sure that the metadata producer is
1893 * either dead or blocked.
1895 lttng_ustconsumer_close_metadata(metadata_ht
);
1898 ERR("Unknown consumer_data type");
1904 * Clean up a metadata stream and free its memory.
1906 void consumer_del_metadata_stream(struct lttng_consumer_stream
*stream
,
1907 struct lttng_ht
*ht
)
1910 struct lttng_ht_iter iter
;
1911 struct lttng_consumer_channel
*free_chan
= NULL
;
1912 struct consumer_relayd_sock_pair
*relayd
;
1916 * This call should NEVER receive regular stream. It must always be
1917 * metadata stream and this is crucial for data structure synchronization.
1919 assert(stream
->metadata_flag
);
1921 DBG3("Consumer delete metadata stream %d", stream
->wait_fd
);
1924 /* Means the stream was allocated but not successfully added */
1925 goto free_stream_rcu
;
1928 pthread_mutex_lock(&consumer_data
.lock
);
1929 pthread_mutex_lock(&stream
->chan
->lock
);
1930 pthread_mutex_lock(&stream
->lock
);
1932 switch (consumer_data
.type
) {
1933 case LTTNG_CONSUMER_KERNEL
:
1934 if (stream
->mmap_base
!= NULL
) {
1935 ret
= munmap(stream
->mmap_base
, stream
->mmap_len
);
1937 PERROR("munmap metadata stream");
1941 if (stream
->wait_fd
>= 0) {
1942 ret
= close(stream
->wait_fd
);
1944 PERROR("close kernel metadata wait_fd");
1948 case LTTNG_CONSUMER32_UST
:
1949 case LTTNG_CONSUMER64_UST
:
1950 lttng_ustconsumer_del_stream(stream
);
1953 ERR("Unknown consumer_data type");
1959 iter
.iter
.node
= &stream
->node
.node
;
1960 ret
= lttng_ht_del(ht
, &iter
);
1963 iter
.iter
.node
= &stream
->node_channel_id
.node
;
1964 ret
= lttng_ht_del(consumer_data
.stream_per_chan_id_ht
, &iter
);
1967 iter
.iter
.node
= &stream
->node_session_id
.node
;
1968 ret
= lttng_ht_del(consumer_data
.stream_list_ht
, &iter
);
1972 if (stream
->out_fd
>= 0) {
1973 ret
= close(stream
->out_fd
);
1979 /* Check and cleanup relayd */
1981 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
1982 if (relayd
!= NULL
) {
1983 uatomic_dec(&relayd
->refcount
);
1984 assert(uatomic_read(&relayd
->refcount
) >= 0);
1986 /* Closing streams requires to lock the control socket. */
1987 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
1988 ret
= relayd_send_close_stream(&relayd
->control_sock
,
1989 stream
->relayd_stream_id
, stream
->next_net_seq_num
- 1);
1990 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
1992 DBG("Unable to close stream on the relayd. Continuing");
1994 * Continue here. There is nothing we can do for the relayd.
1995 * Chances are that the relayd has closed the socket so we just
1996 * continue cleaning up.
2000 /* Both conditions are met, we destroy the relayd. */
2001 if (uatomic_read(&relayd
->refcount
) == 0 &&
2002 uatomic_read(&relayd
->destroy_flag
)) {
2003 destroy_relayd(relayd
);
2008 /* Atomically decrement channel refcount since other threads can use it. */
2009 if (!uatomic_sub_return(&stream
->chan
->refcount
, 1)
2010 && !uatomic_read(&stream
->chan
->nb_init_stream_left
)) {
2011 /* Go for channel deletion! */
2012 free_chan
= stream
->chan
;
2017 * Nullify the stream reference so it is not used after deletion. The
2018 * channel lock MUST be acquired before being able to check for
2019 * a NULL pointer value.
2021 stream
->chan
->metadata_stream
= NULL
;
2023 pthread_mutex_unlock(&stream
->lock
);
2024 pthread_mutex_unlock(&stream
->chan
->lock
);
2025 pthread_mutex_unlock(&consumer_data
.lock
);
2028 consumer_del_channel(free_chan
);
2032 call_rcu(&stream
->node
.head
, free_stream_rcu
);
2036 * Action done with the metadata stream when adding it to the consumer internal
2037 * data structures to handle it.
2039 int consumer_add_metadata_stream(struct lttng_consumer_stream
*stream
)
2041 struct lttng_ht
*ht
= metadata_ht
;
2043 struct consumer_relayd_sock_pair
*relayd
;
2044 struct lttng_ht_iter iter
;
2045 struct lttng_ht_node_u64
*node
;
2050 DBG3("Adding metadata stream %" PRIu64
" to hash table", stream
->key
);
2052 pthread_mutex_lock(&consumer_data
.lock
);
2053 pthread_mutex_lock(&stream
->chan
->lock
);
2054 pthread_mutex_lock(&stream
->chan
->timer_lock
);
2055 pthread_mutex_lock(&stream
->lock
);
2058 * From here, refcounts are updated so be _careful_ when returning an error
2065 * Lookup the stream just to make sure it does not exist in our internal
2066 * state. This should NEVER happen.
2068 lttng_ht_lookup(ht
, &stream
->key
, &iter
);
2069 node
= lttng_ht_iter_get_node_u64(&iter
);
2072 /* Find relayd and, if one is found, increment refcount. */
2073 relayd
= consumer_find_relayd(stream
->net_seq_idx
);
2074 if (relayd
!= NULL
) {
2075 uatomic_inc(&relayd
->refcount
);
2079 * When nb_init_stream_left reaches 0, we don't need to trigger any action
2080 * in terms of destroying the associated channel, because the action that
2081 * causes the count to become 0 also causes a stream to be added. The
2082 * channel deletion will thus be triggered by the following removal of this
2085 if (uatomic_read(&stream
->chan
->nb_init_stream_left
) > 0) {
2086 /* Increment refcount before decrementing nb_init_stream_left */
2088 uatomic_dec(&stream
->chan
->nb_init_stream_left
);
2091 lttng_ht_add_unique_u64(ht
, &stream
->node
);
2093 lttng_ht_add_unique_u64(consumer_data
.stream_per_chan_id_ht
,
2094 &stream
->node_channel_id
);
2097 * Add stream to the stream_list_ht of the consumer data. No need to steal
2098 * the key since the HT does not use it and we allow to add redundant keys
2101 lttng_ht_add_u64(consumer_data
.stream_list_ht
, &stream
->node_session_id
);
2105 pthread_mutex_unlock(&stream
->lock
);
2106 pthread_mutex_unlock(&stream
->chan
->lock
);
2107 pthread_mutex_unlock(&stream
->chan
->timer_lock
);
2108 pthread_mutex_unlock(&consumer_data
.lock
);
2113 * Delete data stream that are flagged for deletion (endpoint_status).
2115 static void validate_endpoint_status_data_stream(void)
2117 struct lttng_ht_iter iter
;
2118 struct lttng_consumer_stream
*stream
;
2120 DBG("Consumer delete flagged data stream");
2123 cds_lfht_for_each_entry(data_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
2124 /* Validate delete flag of the stream */
2125 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_ACTIVE
) {
2128 /* Delete it right now */
2129 consumer_del_stream(stream
, data_ht
);
2135 * Delete metadata stream that are flagged for deletion (endpoint_status).
2137 static void validate_endpoint_status_metadata_stream(
2138 struct lttng_poll_event
*pollset
)
2140 struct lttng_ht_iter iter
;
2141 struct lttng_consumer_stream
*stream
;
2143 DBG("Consumer delete flagged metadata stream");
2148 cds_lfht_for_each_entry(metadata_ht
->ht
, &iter
.iter
, stream
, node
.node
) {
2149 /* Validate delete flag of the stream */
2150 if (stream
->endpoint_status
== CONSUMER_ENDPOINT_ACTIVE
) {
2154 * Remove from pollset so the metadata thread can continue without
2155 * blocking on a deleted stream.
2157 lttng_poll_del(pollset
, stream
->wait_fd
);
2159 /* Delete it right now */
2160 consumer_del_metadata_stream(stream
, metadata_ht
);
2166 * Thread polls on metadata file descriptor and write them on disk or on the
2169 void *consumer_thread_metadata_poll(void *data
)
2172 uint32_t revents
, nb_fd
;
2173 struct lttng_consumer_stream
*stream
= NULL
;
2174 struct lttng_ht_iter iter
;
2175 struct lttng_ht_node_u64
*node
;
2176 struct lttng_poll_event events
;
2177 struct lttng_consumer_local_data
*ctx
= data
;
2180 rcu_register_thread();
2182 metadata_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2184 /* ENOMEM at this point. Better to bail out. */
2188 DBG("Thread metadata poll started");
2190 /* Size is set to 1 for the consumer_metadata pipe */
2191 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2193 ERR("Poll set creation failed");
2197 ret
= lttng_poll_add(&events
,
2198 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
), LPOLLIN
);
2204 DBG("Metadata main loop started");
2207 /* Only the metadata pipe is set */
2208 if (LTTNG_POLL_GETNB(&events
) == 0 && consumer_quit
== 1) {
2213 DBG("Metadata poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events
));
2214 ret
= lttng_poll_wait(&events
, -1);
2215 DBG("Metadata event catched in thread");
2217 if (errno
== EINTR
) {
2218 ERR("Poll EINTR catched");
2226 /* From here, the event is a metadata wait fd */
2227 for (i
= 0; i
< nb_fd
; i
++) {
2228 revents
= LTTNG_POLL_GETEV(&events
, i
);
2229 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2231 /* Just don't waste time if no returned events for the fd */
2236 if (pollfd
== lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
)) {
2237 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2238 DBG("Metadata thread pipe hung up");
2240 * Remove the pipe from the poll set and continue the loop
2241 * since their might be data to consume.
2243 lttng_poll_del(&events
,
2244 lttng_pipe_get_readfd(ctx
->consumer_metadata_pipe
));
2245 lttng_pipe_read_close(ctx
->consumer_metadata_pipe
);
2247 } else if (revents
& LPOLLIN
) {
2250 pipe_len
= lttng_pipe_read(ctx
->consumer_metadata_pipe
,
2251 &stream
, sizeof(stream
));
2253 ERR("read metadata stream, ret: %zd", pipe_len
);
2255 * Continue here to handle the rest of the streams.
2260 /* A NULL stream means that the state has changed. */
2261 if (stream
== NULL
) {
2262 /* Check for deleted streams. */
2263 validate_endpoint_status_metadata_stream(&events
);
2267 DBG("Adding metadata stream %d to poll set",
2270 /* Add metadata stream to the global poll events list */
2271 lttng_poll_add(&events
, stream
->wait_fd
,
2272 LPOLLIN
| LPOLLPRI
);
2275 /* Handle other stream */
2281 uint64_t tmp_id
= (uint64_t) pollfd
;
2283 lttng_ht_lookup(metadata_ht
, &tmp_id
, &iter
);
2285 node
= lttng_ht_iter_get_node_u64(&iter
);
2288 stream
= caa_container_of(node
, struct lttng_consumer_stream
,
2291 /* Check for error event */
2292 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2293 DBG("Metadata fd %d is hup|err.", pollfd
);
2294 if (!stream
->hangup_flush_done
2295 && (consumer_data
.type
== LTTNG_CONSUMER32_UST
2296 || consumer_data
.type
== LTTNG_CONSUMER64_UST
)) {
2297 DBG("Attempting to flush and consume the UST buffers");
2298 lttng_ustconsumer_on_stream_hangup(stream
);
2300 /* We just flushed the stream now read it. */
2302 len
= ctx
->on_buffer_ready(stream
, ctx
);
2304 * We don't check the return value here since if we get
2305 * a negative len, it means an error occured thus we
2306 * simply remove it from the poll set and free the
2312 lttng_poll_del(&events
, stream
->wait_fd
);
2314 * This call update the channel states, closes file descriptors
2315 * and securely free the stream.
2317 consumer_del_metadata_stream(stream
, metadata_ht
);
2318 } else if (revents
& (LPOLLIN
| LPOLLPRI
)) {
2319 /* Get the data out of the metadata file descriptor */
2320 DBG("Metadata available on fd %d", pollfd
);
2321 assert(stream
->wait_fd
== pollfd
);
2323 len
= ctx
->on_buffer_ready(stream
, ctx
);
2324 /* It's ok to have an unavailable sub-buffer */
2325 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2326 /* Clean up stream from consumer and free it. */
2327 lttng_poll_del(&events
, stream
->wait_fd
);
2328 consumer_del_metadata_stream(stream
, metadata_ht
);
2329 } else if (len
> 0) {
2330 stream
->data_read
= 1;
2334 /* Release RCU lock for the stream looked up */
2341 DBG("Metadata poll thread exiting");
2343 lttng_poll_clean(&events
);
2345 destroy_stream_ht(metadata_ht
);
2347 rcu_unregister_thread();
2352 * This thread polls the fds in the set to consume the data and write
2353 * it to tracefile if necessary.
2355 void *consumer_thread_data_poll(void *data
)
2357 int num_rdy
, num_hup
, high_prio
, ret
, i
;
2358 struct pollfd
*pollfd
= NULL
;
2359 /* local view of the streams */
2360 struct lttng_consumer_stream
**local_stream
= NULL
, *new_stream
= NULL
;
2361 /* local view of consumer_data.fds_count */
2363 struct lttng_consumer_local_data
*ctx
= data
;
2366 rcu_register_thread();
2368 data_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2369 if (data_ht
== NULL
) {
2370 /* ENOMEM at this point. Better to bail out. */
2374 local_stream
= zmalloc(sizeof(struct lttng_consumer_stream
*));
2375 if (local_stream
== NULL
) {
2376 PERROR("local_stream malloc");
2385 * the fds set has been updated, we need to update our
2386 * local array as well
2388 pthread_mutex_lock(&consumer_data
.lock
);
2389 if (consumer_data
.need_update
) {
2394 local_stream
= NULL
;
2396 /* allocate for all fds + 1 for the consumer_data_pipe */
2397 pollfd
= zmalloc((consumer_data
.stream_count
+ 1) * sizeof(struct pollfd
));
2398 if (pollfd
== NULL
) {
2399 PERROR("pollfd malloc");
2400 pthread_mutex_unlock(&consumer_data
.lock
);
2404 /* allocate for all fds + 1 for the consumer_data_pipe */
2405 local_stream
= zmalloc((consumer_data
.stream_count
+ 1) *
2406 sizeof(struct lttng_consumer_stream
*));
2407 if (local_stream
== NULL
) {
2408 PERROR("local_stream malloc");
2409 pthread_mutex_unlock(&consumer_data
.lock
);
2412 ret
= update_poll_array(ctx
, &pollfd
, local_stream
,
2415 ERR("Error in allocating pollfd or local_outfds");
2416 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
2417 pthread_mutex_unlock(&consumer_data
.lock
);
2421 consumer_data
.need_update
= 0;
2423 pthread_mutex_unlock(&consumer_data
.lock
);
2425 /* No FDs and consumer_quit, consumer_cleanup the thread */
2426 if (nb_fd
== 0 && consumer_quit
== 1) {
2429 /* poll on the array of fds */
2431 DBG("polling on %d fd", nb_fd
+ 1);
2432 num_rdy
= poll(pollfd
, nb_fd
+ 1, -1);
2433 DBG("poll num_rdy : %d", num_rdy
);
2434 if (num_rdy
== -1) {
2436 * Restart interrupted system call.
2438 if (errno
== EINTR
) {
2441 PERROR("Poll error");
2442 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
2444 } else if (num_rdy
== 0) {
2445 DBG("Polling thread timed out");
2450 * If the consumer_data_pipe triggered poll go directly to the
2451 * beginning of the loop to update the array. We want to prioritize
2452 * array update over low-priority reads.
2454 if (pollfd
[nb_fd
].revents
& (POLLIN
| POLLPRI
)) {
2455 ssize_t pipe_readlen
;
2457 DBG("consumer_data_pipe wake up");
2458 pipe_readlen
= lttng_pipe_read(ctx
->consumer_data_pipe
,
2459 &new_stream
, sizeof(new_stream
));
2460 if (pipe_readlen
< 0) {
2461 ERR("Consumer data pipe ret %zd", pipe_readlen
);
2462 /* Continue so we can at least handle the current stream(s). */
2467 * If the stream is NULL, just ignore it. It's also possible that
2468 * the sessiond poll thread changed the consumer_quit state and is
2469 * waking us up to test it.
2471 if (new_stream
== NULL
) {
2472 validate_endpoint_status_data_stream();
2476 /* Continue to update the local streams and handle prio ones */
2480 /* Take care of high priority channels first. */
2481 for (i
= 0; i
< nb_fd
; i
++) {
2482 if (local_stream
[i
] == NULL
) {
2485 if (pollfd
[i
].revents
& POLLPRI
) {
2486 DBG("Urgent read on fd %d", pollfd
[i
].fd
);
2488 len
= ctx
->on_buffer_ready(local_stream
[i
], ctx
);
2489 /* it's ok to have an unavailable sub-buffer */
2490 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2491 /* Clean the stream and free it. */
2492 consumer_del_stream(local_stream
[i
], data_ht
);
2493 local_stream
[i
] = NULL
;
2494 } else if (len
> 0) {
2495 local_stream
[i
]->data_read
= 1;
2501 * If we read high prio channel in this loop, try again
2502 * for more high prio data.
2508 /* Take care of low priority channels. */
2509 for (i
= 0; i
< nb_fd
; i
++) {
2510 if (local_stream
[i
] == NULL
) {
2513 if ((pollfd
[i
].revents
& POLLIN
) ||
2514 local_stream
[i
]->hangup_flush_done
) {
2515 DBG("Normal read on fd %d", pollfd
[i
].fd
);
2516 len
= ctx
->on_buffer_ready(local_stream
[i
], ctx
);
2517 /* it's ok to have an unavailable sub-buffer */
2518 if (len
< 0 && len
!= -EAGAIN
&& len
!= -ENODATA
) {
2519 /* Clean the stream and free it. */
2520 consumer_del_stream(local_stream
[i
], data_ht
);
2521 local_stream
[i
] = NULL
;
2522 } else if (len
> 0) {
2523 local_stream
[i
]->data_read
= 1;
2528 /* Handle hangup and errors */
2529 for (i
= 0; i
< nb_fd
; i
++) {
2530 if (local_stream
[i
] == NULL
) {
2533 if (!local_stream
[i
]->hangup_flush_done
2534 && (pollfd
[i
].revents
& (POLLHUP
| POLLERR
| POLLNVAL
))
2535 && (consumer_data
.type
== LTTNG_CONSUMER32_UST
2536 || consumer_data
.type
== LTTNG_CONSUMER64_UST
)) {
2537 DBG("fd %d is hup|err|nval. Attempting flush and read.",
2539 lttng_ustconsumer_on_stream_hangup(local_stream
[i
]);
2540 /* Attempt read again, for the data we just flushed. */
2541 local_stream
[i
]->data_read
= 1;
2544 * If the poll flag is HUP/ERR/NVAL and we have
2545 * read no data in this pass, we can remove the
2546 * stream from its hash table.
2548 if ((pollfd
[i
].revents
& POLLHUP
)) {
2549 DBG("Polling fd %d tells it has hung up.", pollfd
[i
].fd
);
2550 if (!local_stream
[i
]->data_read
) {
2551 consumer_del_stream(local_stream
[i
], data_ht
);
2552 local_stream
[i
] = NULL
;
2555 } else if (pollfd
[i
].revents
& POLLERR
) {
2556 ERR("Error returned in polling fd %d.", pollfd
[i
].fd
);
2557 if (!local_stream
[i
]->data_read
) {
2558 consumer_del_stream(local_stream
[i
], data_ht
);
2559 local_stream
[i
] = NULL
;
2562 } else if (pollfd
[i
].revents
& POLLNVAL
) {
2563 ERR("Polling fd %d tells fd is not open.", pollfd
[i
].fd
);
2564 if (!local_stream
[i
]->data_read
) {
2565 consumer_del_stream(local_stream
[i
], data_ht
);
2566 local_stream
[i
] = NULL
;
2570 if (local_stream
[i
] != NULL
) {
2571 local_stream
[i
]->data_read
= 0;
2576 DBG("polling thread exiting");
2581 * Close the write side of the pipe so epoll_wait() in
2582 * consumer_thread_metadata_poll can catch it. The thread is monitoring the
2583 * read side of the pipe. If we close them both, epoll_wait strangely does
2584 * not return and could create a endless wait period if the pipe is the
2585 * only tracked fd in the poll set. The thread will take care of closing
2588 (void) lttng_pipe_write_close(ctx
->consumer_metadata_pipe
);
2590 destroy_data_stream_ht(data_ht
);
2592 rcu_unregister_thread();
2597 * Close wake-up end of each stream belonging to the channel. This will
2598 * allow the poll() on the stream read-side to detect when the
2599 * write-side (application) finally closes them.
2602 void consumer_close_channel_streams(struct lttng_consumer_channel
*channel
)
2604 struct lttng_ht
*ht
;
2605 struct lttng_consumer_stream
*stream
;
2606 struct lttng_ht_iter iter
;
2608 ht
= consumer_data
.stream_per_chan_id_ht
;
2611 cds_lfht_for_each_entry_duplicate(ht
->ht
,
2612 ht
->hash_fct(&channel
->key
, lttng_ht_seed
),
2613 ht
->match_fct
, &channel
->key
,
2614 &iter
.iter
, stream
, node_channel_id
.node
) {
2616 * Protect against teardown with mutex.
2618 pthread_mutex_lock(&stream
->lock
);
2619 if (cds_lfht_is_node_deleted(&stream
->node
.node
)) {
2622 switch (consumer_data
.type
) {
2623 case LTTNG_CONSUMER_KERNEL
:
2625 case LTTNG_CONSUMER32_UST
:
2626 case LTTNG_CONSUMER64_UST
:
2628 * Note: a mutex is taken internally within
2629 * liblttng-ust-ctl to protect timer wakeup_fd
2630 * use from concurrent close.
2632 lttng_ustconsumer_close_stream_wakeup(stream
);
2635 ERR("Unknown consumer_data type");
2639 pthread_mutex_unlock(&stream
->lock
);
2644 static void destroy_channel_ht(struct lttng_ht
*ht
)
2646 struct lttng_ht_iter iter
;
2647 struct lttng_consumer_channel
*channel
;
2655 cds_lfht_for_each_entry(ht
->ht
, &iter
.iter
, channel
, wait_fd_node
.node
) {
2656 ret
= lttng_ht_del(ht
, &iter
);
2661 lttng_ht_destroy(ht
);
2665 * This thread polls the channel fds to detect when they are being
2666 * closed. It closes all related streams if the channel is detected as
2667 * closed. It is currently only used as a shim layer for UST because the
2668 * consumerd needs to keep the per-stream wakeup end of pipes open for
2671 void *consumer_thread_channel_poll(void *data
)
2674 uint32_t revents
, nb_fd
;
2675 struct lttng_consumer_channel
*chan
= NULL
;
2676 struct lttng_ht_iter iter
;
2677 struct lttng_ht_node_u64
*node
;
2678 struct lttng_poll_event events
;
2679 struct lttng_consumer_local_data
*ctx
= data
;
2680 struct lttng_ht
*channel_ht
;
2682 rcu_register_thread();
2684 channel_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2686 /* ENOMEM at this point. Better to bail out. */
2690 DBG("Thread channel poll started");
2692 /* Size is set to 1 for the consumer_channel pipe */
2693 ret
= lttng_poll_create(&events
, 2, LTTNG_CLOEXEC
);
2695 ERR("Poll set creation failed");
2699 ret
= lttng_poll_add(&events
, ctx
->consumer_channel_pipe
[0], LPOLLIN
);
2705 DBG("Channel main loop started");
2708 /* Only the channel pipe is set */
2709 if (LTTNG_POLL_GETNB(&events
) == 0 && consumer_quit
== 1) {
2714 DBG("Channel poll wait with %d fd(s)", LTTNG_POLL_GETNB(&events
));
2715 ret
= lttng_poll_wait(&events
, -1);
2716 DBG("Channel event catched in thread");
2718 if (errno
== EINTR
) {
2719 ERR("Poll EINTR catched");
2727 /* From here, the event is a channel wait fd */
2728 for (i
= 0; i
< nb_fd
; i
++) {
2729 revents
= LTTNG_POLL_GETEV(&events
, i
);
2730 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2732 /* Just don't waste time if no returned events for the fd */
2736 if (pollfd
== ctx
->consumer_channel_pipe
[0]) {
2737 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2738 DBG("Channel thread pipe hung up");
2740 * Remove the pipe from the poll set and continue the loop
2741 * since their might be data to consume.
2743 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
2745 } else if (revents
& LPOLLIN
) {
2746 enum consumer_channel_action action
;
2749 ret
= read_channel_pipe(ctx
, &chan
, &key
, &action
);
2751 ERR("Error reading channel pipe");
2756 case CONSUMER_CHANNEL_ADD
:
2757 DBG("Adding channel %d to poll set",
2760 lttng_ht_node_init_u64(&chan
->wait_fd_node
,
2763 lttng_ht_add_unique_u64(channel_ht
,
2764 &chan
->wait_fd_node
);
2766 /* Add channel to the global poll events list */
2767 lttng_poll_add(&events
, chan
->wait_fd
,
2768 LPOLLIN
| LPOLLPRI
);
2770 case CONSUMER_CHANNEL_DEL
:
2772 struct lttng_consumer_stream
*stream
, *stmp
;
2775 chan
= consumer_find_channel(key
);
2778 ERR("UST consumer get channel key %" PRIu64
" not found for del channel", key
);
2781 lttng_poll_del(&events
, chan
->wait_fd
);
2782 iter
.iter
.node
= &chan
->wait_fd_node
.node
;
2783 ret
= lttng_ht_del(channel_ht
, &iter
);
2785 consumer_close_channel_streams(chan
);
2787 switch (consumer_data
.type
) {
2788 case LTTNG_CONSUMER_KERNEL
:
2790 case LTTNG_CONSUMER32_UST
:
2791 case LTTNG_CONSUMER64_UST
:
2792 /* Delete streams that might have been left in the stream list. */
2793 cds_list_for_each_entry_safe(stream
, stmp
, &chan
->streams
.head
,
2795 cds_list_del(&stream
->send_node
);
2796 lttng_ustconsumer_del_stream(stream
);
2797 uatomic_sub(&stream
->chan
->refcount
, 1);
2798 assert(&chan
->refcount
);
2803 ERR("Unknown consumer_data type");
2808 * Release our own refcount. Force channel deletion even if
2809 * streams were not initialized.
2811 if (!uatomic_sub_return(&chan
->refcount
, 1)) {
2812 consumer_del_channel(chan
);
2817 case CONSUMER_CHANNEL_QUIT
:
2819 * Remove the pipe from the poll set and continue the loop
2820 * since their might be data to consume.
2822 lttng_poll_del(&events
, ctx
->consumer_channel_pipe
[0]);
2825 ERR("Unknown action");
2830 /* Handle other stream */
2836 uint64_t tmp_id
= (uint64_t) pollfd
;
2838 lttng_ht_lookup(channel_ht
, &tmp_id
, &iter
);
2840 node
= lttng_ht_iter_get_node_u64(&iter
);
2843 chan
= caa_container_of(node
, struct lttng_consumer_channel
,
2846 /* Check for error event */
2847 if (revents
& (LPOLLERR
| LPOLLHUP
)) {
2848 DBG("Channel fd %d is hup|err.", pollfd
);
2850 lttng_poll_del(&events
, chan
->wait_fd
);
2851 ret
= lttng_ht_del(channel_ht
, &iter
);
2853 assert(cds_list_empty(&chan
->streams
.head
));
2854 consumer_close_channel_streams(chan
);
2856 /* Release our own refcount */
2857 if (!uatomic_sub_return(&chan
->refcount
, 1)
2858 && !uatomic_read(&chan
->nb_init_stream_left
)) {
2859 consumer_del_channel(chan
);
2863 /* Release RCU lock for the channel looked up */
2869 lttng_poll_clean(&events
);
2871 destroy_channel_ht(channel_ht
);
2873 DBG("Channel poll thread exiting");
2874 rcu_unregister_thread();
2878 static int set_metadata_socket(struct lttng_consumer_local_data
*ctx
,
2879 struct pollfd
*sockpoll
, int client_socket
)
2886 if (lttng_consumer_poll_socket(sockpoll
) < 0) {
2890 DBG("Metadata connection on client_socket");
2892 /* Blocking call, waiting for transmission */
2893 ctx
->consumer_metadata_socket
= lttcomm_accept_unix_sock(client_socket
);
2894 if (ctx
->consumer_metadata_socket
< 0) {
2895 WARN("On accept metadata");
2906 * This thread listens on the consumerd socket and receives the file
2907 * descriptors from the session daemon.
2909 void *consumer_thread_sessiond_poll(void *data
)
2911 int sock
= -1, client_socket
, ret
;
2913 * structure to poll for incoming data on communication socket avoids
2914 * making blocking sockets.
2916 struct pollfd consumer_sockpoll
[2];
2917 struct lttng_consumer_local_data
*ctx
= data
;
2919 rcu_register_thread();
2921 DBG("Creating command socket %s", ctx
->consumer_command_sock_path
);
2922 unlink(ctx
->consumer_command_sock_path
);
2923 client_socket
= lttcomm_create_unix_sock(ctx
->consumer_command_sock_path
);
2924 if (client_socket
< 0) {
2925 ERR("Cannot create command socket");
2929 ret
= lttcomm_listen_unix_sock(client_socket
);
2934 DBG("Sending ready command to lttng-sessiond");
2935 ret
= lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
);
2936 /* return < 0 on error, but == 0 is not fatal */
2938 ERR("Error sending ready command to lttng-sessiond");
2942 /* prepare the FDs to poll : to client socket and the should_quit pipe */
2943 consumer_sockpoll
[0].fd
= ctx
->consumer_should_quit
[0];
2944 consumer_sockpoll
[0].events
= POLLIN
| POLLPRI
;
2945 consumer_sockpoll
[1].fd
= client_socket
;
2946 consumer_sockpoll
[1].events
= POLLIN
| POLLPRI
;
2948 if (lttng_consumer_poll_socket(consumer_sockpoll
) < 0) {
2951 DBG("Connection on client_socket");
2953 /* Blocking call, waiting for transmission */
2954 sock
= lttcomm_accept_unix_sock(client_socket
);
2961 * Setup metadata socket which is the second socket connection on the
2962 * command unix socket.
2964 ret
= set_metadata_socket(ctx
, consumer_sockpoll
, client_socket
);
2969 /* This socket is not useful anymore. */
2970 ret
= close(client_socket
);
2972 PERROR("close client_socket");
2976 /* update the polling structure to poll on the established socket */
2977 consumer_sockpoll
[1].fd
= sock
;
2978 consumer_sockpoll
[1].events
= POLLIN
| POLLPRI
;
2981 if (lttng_consumer_poll_socket(consumer_sockpoll
) < 0) {
2984 DBG("Incoming command on sock");
2985 ret
= lttng_consumer_recv_cmd(ctx
, sock
, consumer_sockpoll
);
2986 if (ret
== -ENOENT
) {
2987 DBG("Received STOP command");
2992 * This could simply be a session daemon quitting. Don't output
2995 DBG("Communication interrupted on command socket");
2998 if (consumer_quit
) {
2999 DBG("consumer_thread_receive_fds received quit from signal");
3002 DBG("received command on sock");
3005 DBG("Consumer thread sessiond poll exiting");
3008 * Close metadata streams since the producer is the session daemon which
3011 * NOTE: for now, this only applies to the UST tracer.
3013 lttng_consumer_close_metadata();
3016 * when all fds have hung up, the polling thread
3022 * Notify the data poll thread to poll back again and test the
3023 * consumer_quit state that we just set so to quit gracefully.
3025 notify_thread_lttng_pipe(ctx
->consumer_data_pipe
);
3027 notify_channel_pipe(ctx
, NULL
, -1, CONSUMER_CHANNEL_QUIT
);
3029 /* Cleaning up possibly open sockets. */
3033 PERROR("close sock sessiond poll");
3036 if (client_socket
>= 0) {
3037 ret
= close(client_socket
);
3039 PERROR("close client_socket sessiond poll");
3043 rcu_unregister_thread();
3047 ssize_t
lttng_consumer_read_subbuffer(struct lttng_consumer_stream
*stream
,
3048 struct lttng_consumer_local_data
*ctx
)
3052 pthread_mutex_lock(&stream
->lock
);
3054 switch (consumer_data
.type
) {
3055 case LTTNG_CONSUMER_KERNEL
:
3056 ret
= lttng_kconsumer_read_subbuffer(stream
, ctx
);
3058 case LTTNG_CONSUMER32_UST
:
3059 case LTTNG_CONSUMER64_UST
:
3060 ret
= lttng_ustconsumer_read_subbuffer(stream
, ctx
);
3063 ERR("Unknown consumer_data type");
3069 pthread_mutex_unlock(&stream
->lock
);
3073 int lttng_consumer_on_recv_stream(struct lttng_consumer_stream
*stream
)
3075 switch (consumer_data
.type
) {
3076 case LTTNG_CONSUMER_KERNEL
:
3077 return lttng_kconsumer_on_recv_stream(stream
);
3078 case LTTNG_CONSUMER32_UST
:
3079 case LTTNG_CONSUMER64_UST
:
3080 return lttng_ustconsumer_on_recv_stream(stream
);
3082 ERR("Unknown consumer_data type");
3089 * Allocate and set consumer data hash tables.
3091 void lttng_consumer_init(void)
3093 consumer_data
.channel_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3094 consumer_data
.relayd_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3095 consumer_data
.stream_list_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3096 consumer_data
.stream_per_chan_id_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
3100 * Process the ADD_RELAYD command receive by a consumer.
3102 * This will create a relayd socket pair and add it to the relayd hash table.
3103 * The caller MUST acquire a RCU read side lock before calling it.
3105 int consumer_add_relayd_socket(uint64_t net_seq_idx
, int sock_type
,
3106 struct lttng_consumer_local_data
*ctx
, int sock
,
3107 struct pollfd
*consumer_sockpoll
,
3108 struct lttcomm_relayd_sock
*relayd_sock
, uint64_t sessiond_id
)
3110 int fd
= -1, ret
= -1, relayd_created
= 0;
3111 enum lttng_error_code ret_code
= LTTNG_OK
;
3112 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3115 assert(relayd_sock
);
3117 DBG("Consumer adding relayd socket (idx: %" PRIu64
")", net_seq_idx
);
3119 /* Get relayd reference if exists. */
3120 relayd
= consumer_find_relayd(net_seq_idx
);
3121 if (relayd
== NULL
) {
3122 assert(sock_type
== LTTNG_STREAM_CONTROL
);
3123 /* Not found. Allocate one. */
3124 relayd
= consumer_allocate_relayd_sock_pair(net_seq_idx
);
3125 if (relayd
== NULL
) {
3127 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3130 relayd
->sessiond_session_id
= sessiond_id
;
3135 * This code path MUST continue to the consumer send status message to
3136 * we can notify the session daemon and continue our work without
3137 * killing everything.
3141 * relayd key should never be found for control socket.
3143 assert(sock_type
!= LTTNG_STREAM_CONTROL
);
3146 /* First send a status message before receiving the fds. */
3147 ret
= consumer_send_status_msg(sock
, LTTNG_OK
);
3149 /* Somehow, the session daemon is not responding anymore. */
3150 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3151 goto error_nosignal
;
3154 /* Poll on consumer socket. */
3155 if (lttng_consumer_poll_socket(consumer_sockpoll
) < 0) {
3156 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_POLL_ERROR
);
3158 goto error_nosignal
;
3161 /* Get relayd socket from session daemon */
3162 ret
= lttcomm_recv_fds_unix_sock(sock
, &fd
, 1);
3163 if (ret
!= sizeof(fd
)) {
3165 fd
= -1; /* Just in case it gets set with an invalid value. */
3168 * Failing to receive FDs might indicate a major problem such as
3169 * reaching a fd limit during the receive where the kernel returns a
3170 * MSG_CTRUNC and fails to cleanup the fd in the queue. Any case, we
3171 * don't take any chances and stop everything.
3173 * XXX: Feature request #558 will fix that and avoid this possible
3174 * issue when reaching the fd limit.
3176 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_ERROR_RECV_FD
);
3177 ret_code
= LTTCOMM_CONSUMERD_ERROR_RECV_FD
;
3181 /* Copy socket information and received FD */
3182 switch (sock_type
) {
3183 case LTTNG_STREAM_CONTROL
:
3184 /* Copy received lttcomm socket */
3185 lttcomm_copy_sock(&relayd
->control_sock
.sock
, &relayd_sock
->sock
);
3186 ret
= lttcomm_create_sock(&relayd
->control_sock
.sock
);
3187 /* Handle create_sock error. */
3189 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3193 * Close the socket created internally by
3194 * lttcomm_create_sock, so we can replace it by the one
3195 * received from sessiond.
3197 if (close(relayd
->control_sock
.sock
.fd
)) {
3201 /* Assign new file descriptor */
3202 relayd
->control_sock
.sock
.fd
= fd
;
3203 fd
= -1; /* For error path */
3204 /* Assign version values. */
3205 relayd
->control_sock
.major
= relayd_sock
->major
;
3206 relayd
->control_sock
.minor
= relayd_sock
->minor
;
3209 * Create a session on the relayd and store the returned id. Lock the
3210 * control socket mutex if the relayd was NOT created before.
3212 if (!relayd_created
) {
3213 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3215 ret
= relayd_create_session(&relayd
->control_sock
,
3216 &relayd
->relayd_session_id
);
3217 if (!relayd_created
) {
3218 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3222 * Close all sockets of a relayd object. It will be freed if it was
3223 * created at the error code path or else it will be garbage
3226 (void) relayd_close(&relayd
->control_sock
);
3227 (void) relayd_close(&relayd
->data_sock
);
3228 ret_code
= LTTCOMM_CONSUMERD_RELAYD_FAIL
;
3233 case LTTNG_STREAM_DATA
:
3234 /* Copy received lttcomm socket */
3235 lttcomm_copy_sock(&relayd
->data_sock
.sock
, &relayd_sock
->sock
);
3236 ret
= lttcomm_create_sock(&relayd
->data_sock
.sock
);
3237 /* Handle create_sock error. */
3239 ret_code
= LTTCOMM_CONSUMERD_ENOMEM
;
3243 * Close the socket created internally by
3244 * lttcomm_create_sock, so we can replace it by the one
3245 * received from sessiond.
3247 if (close(relayd
->data_sock
.sock
.fd
)) {
3251 /* Assign new file descriptor */
3252 relayd
->data_sock
.sock
.fd
= fd
;
3253 fd
= -1; /* for eventual error paths */
3254 /* Assign version values. */
3255 relayd
->data_sock
.major
= relayd_sock
->major
;
3256 relayd
->data_sock
.minor
= relayd_sock
->minor
;
3259 ERR("Unknown relayd socket type (%d)", sock_type
);
3261 ret_code
= LTTCOMM_CONSUMERD_FATAL
;
3265 DBG("Consumer %s socket created successfully with net idx %" PRIu64
" (fd: %d)",
3266 sock_type
== LTTNG_STREAM_CONTROL
? "control" : "data",
3267 relayd
->net_seq_idx
, fd
);
3269 /* We successfully added the socket. Send status back. */
3270 ret
= consumer_send_status_msg(sock
, ret_code
);
3272 /* Somehow, the session daemon is not responding anymore. */
3273 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3274 goto error_nosignal
;
3278 * Add relayd socket pair to consumer data hashtable. If object already
3279 * exists or on error, the function gracefully returns.
3287 if (consumer_send_status_msg(sock
, ret_code
) < 0) {
3288 lttng_consumer_send_error(ctx
, LTTCOMM_CONSUMERD_FATAL
);
3292 /* Close received socket if valid. */
3295 PERROR("close received socket");
3299 if (relayd_created
) {
3307 * Try to lock the stream mutex.
3309 * On success, 1 is returned else 0 indicating that the mutex is NOT lock.
3311 static int stream_try_lock(struct lttng_consumer_stream
*stream
)
3318 * Try to lock the stream mutex. On failure, we know that the stream is
3319 * being used else where hence there is data still being extracted.
3321 ret
= pthread_mutex_trylock(&stream
->lock
);
3323 /* For both EBUSY and EINVAL error, the mutex is NOT locked. */
3335 * Search for a relayd associated to the session id and return the reference.
3337 * A rcu read side lock MUST be acquire before calling this function and locked
3338 * until the relayd object is no longer necessary.
3340 static struct consumer_relayd_sock_pair
*find_relayd_by_session_id(uint64_t id
)
3342 struct lttng_ht_iter iter
;
3343 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3345 /* Iterate over all relayd since they are indexed by net_seq_idx. */
3346 cds_lfht_for_each_entry(consumer_data
.relayd_ht
->ht
, &iter
.iter
, relayd
,
3349 * Check by sessiond id which is unique here where the relayd session
3350 * id might not be when having multiple relayd.
3352 if (relayd
->sessiond_session_id
== id
) {
3353 /* Found the relayd. There can be only one per id. */
3365 * Check if for a given session id there is still data needed to be extract
3368 * Return 1 if data is pending or else 0 meaning ready to be read.
3370 int consumer_data_pending(uint64_t id
)
3373 struct lttng_ht_iter iter
;
3374 struct lttng_ht
*ht
;
3375 struct lttng_consumer_stream
*stream
;
3376 struct consumer_relayd_sock_pair
*relayd
= NULL
;
3377 int (*data_pending
)(struct lttng_consumer_stream
*);
3379 DBG("Consumer data pending command on session id %" PRIu64
, id
);
3382 pthread_mutex_lock(&consumer_data
.lock
);
3384 switch (consumer_data
.type
) {
3385 case LTTNG_CONSUMER_KERNEL
:
3386 data_pending
= lttng_kconsumer_data_pending
;
3388 case LTTNG_CONSUMER32_UST
:
3389 case LTTNG_CONSUMER64_UST
:
3390 data_pending
= lttng_ustconsumer_data_pending
;
3393 ERR("Unknown consumer data type");
3397 /* Ease our life a bit */
3398 ht
= consumer_data
.stream_list_ht
;
3400 relayd
= find_relayd_by_session_id(id
);
3402 /* Send init command for data pending. */
3403 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3404 ret
= relayd_begin_data_pending(&relayd
->control_sock
,
3405 relayd
->relayd_session_id
);
3406 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3408 /* Communication error thus the relayd so no data pending. */
3409 goto data_not_pending
;
3413 cds_lfht_for_each_entry_duplicate(ht
->ht
,
3414 ht
->hash_fct(&id
, lttng_ht_seed
),
3416 &iter
.iter
, stream
, node_session_id
.node
) {
3417 /* If this call fails, the stream is being used hence data pending. */
3418 ret
= stream_try_lock(stream
);
3424 * A removed node from the hash table indicates that the stream has
3425 * been deleted thus having a guarantee that the buffers are closed
3426 * on the consumer side. However, data can still be transmitted
3427 * over the network so don't skip the relayd check.
3429 ret
= cds_lfht_is_node_deleted(&stream
->node
.node
);
3431 /* Check the stream if there is data in the buffers. */
3432 ret
= data_pending(stream
);
3434 pthread_mutex_unlock(&stream
->lock
);
3441 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3442 if (stream
->metadata_flag
) {
3443 ret
= relayd_quiescent_control(&relayd
->control_sock
,
3444 stream
->relayd_stream_id
);
3446 ret
= relayd_data_pending(&relayd
->control_sock
,
3447 stream
->relayd_stream_id
,
3448 stream
->next_net_seq_num
- 1);
3450 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3452 pthread_mutex_unlock(&stream
->lock
);
3456 pthread_mutex_unlock(&stream
->lock
);
3460 unsigned int is_data_inflight
= 0;
3462 /* Send init command for data pending. */
3463 pthread_mutex_lock(&relayd
->ctrl_sock_mutex
);
3464 ret
= relayd_end_data_pending(&relayd
->control_sock
,
3465 relayd
->relayd_session_id
, &is_data_inflight
);
3466 pthread_mutex_unlock(&relayd
->ctrl_sock_mutex
);
3468 goto data_not_pending
;
3470 if (is_data_inflight
) {
3476 * Finding _no_ node in the hash table and no inflight data means that the
3477 * stream(s) have been removed thus data is guaranteed to be available for
3478 * analysis from the trace files.
3482 /* Data is available to be read by a viewer. */
3483 pthread_mutex_unlock(&consumer_data
.lock
);
3488 /* Data is still being extracted from buffers. */
3489 pthread_mutex_unlock(&consumer_data
.lock
);
3495 * Send a ret code status message to the sessiond daemon.
3497 * Return the sendmsg() return value.
3499 int consumer_send_status_msg(int sock
, int ret_code
)
3501 struct lttcomm_consumer_status_msg msg
;
3503 msg
.ret_code
= ret_code
;
3505 return lttcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));
3509 * Send a channel status message to the sessiond daemon.
3511 * Return the sendmsg() return value.
3513 int consumer_send_status_channel(int sock
,
3514 struct lttng_consumer_channel
*channel
)
3516 struct lttcomm_consumer_status_channel msg
;
3521 msg
.ret_code
= -LTTNG_ERR_UST_CHAN_FAIL
;
3523 msg
.ret_code
= LTTNG_OK
;
3524 msg
.key
= channel
->key
;
3525 msg
.stream_count
= channel
->streams
.count
;
3528 return lttcomm_send_unix_sock(sock
, &msg
, sizeof(msg
));