2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
36 #include <urcu/futex.h>
37 #include <urcu/uatomic.h>
42 #include <lttng/lttng.h>
43 #include <common/common.h>
44 #include <common/compat/poll.h>
45 #include <common/compat/socket.h>
46 #include <common/defaults.h>
47 #include <common/futex.h>
48 #include <common/index/index.h>
49 #include <common/sessiond-comm/sessiond-comm.h>
50 #include <common/sessiond-comm/inet.h>
51 #include <common/sessiond-comm/relayd.h>
52 #include <common/uri.h>
53 #include <common/utils.h>
57 #include "lttng-relayd.h"
59 #include "health-relayd.h"
60 #include "testpoint.h"
61 #include "viewer-stream.h"
64 #include "ctf-trace.h"
65 #include "connection.h"
67 static struct lttng_uri
*live_uri
;
70 * This pipe is used to inform the worker thread that a command is queued and
71 * ready to be processed.
73 static int live_conn_pipe
[2] = { -1, -1 };
75 /* Shared between threads */
76 static int live_dispatch_thread_exit
;
78 static pthread_t live_listener_thread
;
79 static pthread_t live_dispatcher_thread
;
80 static pthread_t live_worker_thread
;
83 * Relay command queue.
85 * The live_thread_listener and live_thread_dispatcher communicate with this
88 static struct relay_conn_queue viewer_conn_queue
;
90 static uint64_t last_relay_viewer_session_id
;
104 * Receive a request buffer using a given socket, destination allocated buffer
107 * Return the size of the received message or else a negative value on error
108 * with errno being set by recvmsg() syscall.
111 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
118 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
119 if (ret
< 0 || ret
!= size
) {
121 /* Orderly shutdown. Not necessary to print an error. */
122 DBG("Socket %d did an orderly shutdown", sock
->fd
);
124 ERR("Relay failed to receive request.");
133 * Send a response buffer using a given socket, source allocated buffer of
136 * Return the size of the sent message or else a negative value on error with
137 * errno being set by sendmsg() syscall.
140 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
147 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
149 ERR("Relayd failed to send response.");
156 * Atomically check if new streams got added in the session since the last
157 * check and reset the flag to 0.
159 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
163 int check_new_streams(uint64_t session_id
, struct lttng_ht
*sessions_ht
)
166 unsigned long current_val
;
167 struct relay_session
*session
;
171 session
= session_find_by_id(sessions_ht
, session_id
);
173 DBG("Relay session %" PRIu64
" not found", session_id
);
178 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
186 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
187 * this function should ignore the sent flag or not.
189 * Return 0 on success or else a negative value.
192 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
193 struct relay_session
*session
, unsigned int ignore_sent_flag
)
196 struct lttng_viewer_stream send_stream
;
197 struct lttng_ht_iter iter
;
198 struct relay_viewer_stream
*vstream
;
204 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
206 struct ctf_trace
*ctf_trace
;
208 health_code_update();
210 /* Ignore if not the same session. */
211 if (vstream
->session_id
!= session
->id
||
212 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
216 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
220 send_stream
.id
= htobe64(vstream
->stream_handle
);
221 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
222 send_stream
.metadata_flag
= htobe32(vstream
->metadata_flag
);
223 strncpy(send_stream
.path_name
, vstream
->path_name
,
224 sizeof(send_stream
.path_name
));
225 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
226 sizeof(send_stream
.channel_name
));
228 DBG("Sending stream %" PRIu64
" to viewer", vstream
->stream_handle
);
229 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
233 vstream
->sent_flag
= 1;
244 * Create every viewer stream possible for the given session with the seek
245 * type. Three counters *can* be return which are in order the total amount of
246 * viewer stream of the session, the number of unsent stream and the number of
247 * stream created. Those counters can be NULL and thus will be ignored.
249 * Return 0 on success or else a negative value.
252 int make_viewer_streams(struct relay_session
*session
,
253 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
254 uint32_t *nb_created
)
257 struct lttng_ht_iter iter
;
258 struct ctf_trace
*ctf_trace
;
263 * This is to make sure we create viewer streams for a full received
264 * channel. For instance, if we have 8 streams for a channel that are
265 * concurrently being flagged ready, we can end up creating just a subset
266 * of the 8 streams (the ones that are flagged). This lock avoids this
269 pthread_mutex_lock(&session
->viewer_ready_lock
);
272 * Create viewer streams for relay streams that are ready to be used for a
273 * the given session id only.
276 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
278 struct relay_stream
*stream
;
280 health_code_update();
282 if (ctf_trace
->invalid_flag
) {
286 cds_list_for_each_entry(stream
, &ctf_trace
->stream_list
, trace_list
) {
287 struct relay_viewer_stream
*vstream
;
289 if (!stream
->viewer_ready
) {
293 vstream
= viewer_stream_find_by_id(stream
->stream_handle
);
295 vstream
= viewer_stream_create(stream
, seek_t
, ctf_trace
);
300 /* Acquire reference to ctf_trace. */
301 ctf_trace_get_ref(ctf_trace
);
304 /* Update number of created stream counter. */
307 } else if (!vstream
->sent_flag
&& nb_unsent
) {
308 /* Update number of unsent stream counter. */
311 /* Update number of total stream counter. */
322 pthread_mutex_unlock(&session
->viewer_ready_lock
);
327 * Write to writable pipe used to notify a thread.
330 int notify_thread_pipe(int wpipe
)
334 ret
= lttng_write(wpipe
, "!", 1);
336 PERROR("write poll pipe");
343 * Stop all threads by closing the thread quit pipe.
346 void stop_threads(void)
350 /* Stopping all threads */
351 DBG("Terminating all live threads");
352 ret
= notify_thread_pipe(live_conn_pipe
[1]);
354 ERR("write error on thread quit pipe");
357 /* Dispatch thread */
358 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
359 futex_nto1_wake(&viewer_conn_queue
.futex
);
363 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
366 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
370 if (events
== NULL
|| size
== 0) {
375 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
381 ret
= lttng_poll_add(events
, live_conn_pipe
[0], LPOLLIN
| LPOLLERR
);
393 * Check if the thread quit pipe was triggered.
395 * Return 1 if it was triggered else 0;
398 int check_live_conn_pipe(int fd
, uint32_t events
)
400 if (fd
== live_conn_pipe
[0] && (events
& LPOLLIN
)) {
408 * Create and init socket from uri.
411 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
414 struct lttcomm_sock
*sock
= NULL
;
416 sock
= lttcomm_alloc_sock_from_uri(uri
);
418 ERR("Allocating socket");
422 ret
= lttcomm_create_sock(sock
);
426 DBG("Listening on sock %d for live", sock
->fd
);
428 ret
= sock
->ops
->bind(sock
);
433 ret
= sock
->ops
->listen(sock
, -1);
443 lttcomm_destroy_sock(sock
);
449 * This thread manages the listening for new connections on the network
452 void *thread_listener(void *data
)
454 int i
, ret
, pollfd
, err
= -1;
455 uint32_t revents
, nb_fd
;
456 struct lttng_poll_event events
;
457 struct lttcomm_sock
*live_control_sock
;
459 DBG("[thread] Relay live listener started");
461 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
463 health_code_update();
465 live_control_sock
= init_socket(live_uri
);
466 if (!live_control_sock
) {
467 goto error_sock_control
;
470 /* Pass 2 as size here for the thread quit pipe and control sockets. */
471 ret
= create_thread_poll_set(&events
, 2);
473 goto error_create_poll
;
476 /* Add the control socket */
477 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
482 lttng_relay_notify_ready();
484 if (testpoint(relayd_thread_live_listener
)) {
485 goto error_testpoint
;
489 health_code_update();
491 DBG("Listener accepting live viewers connections");
495 ret
= lttng_poll_wait(&events
, -1);
499 * Restart interrupted system call.
501 if (errno
== EINTR
) {
508 DBG("Relay new viewer connection received");
509 for (i
= 0; i
< nb_fd
; i
++) {
510 health_code_update();
512 /* Fetch once the poll data */
513 revents
= LTTNG_POLL_GETEV(&events
, i
);
514 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
516 /* Thread quit pipe has been closed. Killing thread. */
517 ret
= check_live_conn_pipe(pollfd
, revents
);
523 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
524 ERR("socket poll error");
526 } else if (revents
& LPOLLIN
) {
528 * Get allocated in this thread, enqueued to a global queue,
529 * dequeued and freed in the worker thread.
532 struct relay_connection
*new_conn
;
533 struct lttcomm_sock
*newsock
;
535 new_conn
= connection_create();
540 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
542 PERROR("accepting control sock");
543 connection_free(new_conn
);
546 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
548 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
551 PERROR("setsockopt inet");
552 lttcomm_destroy_sock(newsock
);
553 connection_free(new_conn
);
556 new_conn
->sock
= newsock
;
558 /* Enqueue request for the dispatcher thread. */
559 cds_wfq_enqueue(&viewer_conn_queue
.queue
, &new_conn
->qnode
);
562 * Wake the dispatch queue futex. Implicit memory barrier with
563 * the exchange in cds_wfq_enqueue.
565 futex_nto1_wake(&viewer_conn_queue
.futex
);
574 lttng_poll_clean(&events
);
576 if (live_control_sock
->fd
>= 0) {
577 ret
= live_control_sock
->ops
->close(live_control_sock
);
582 lttcomm_destroy_sock(live_control_sock
);
586 DBG("Live viewer listener thread exited with error");
588 health_unregister(health_relayd
);
589 DBG("Live viewer listener thread cleanup complete");
595 * This thread manages the dispatching of the requests to worker threads
598 void *thread_dispatcher(void *data
)
602 struct cds_wfq_node
*node
;
603 struct relay_connection
*conn
= NULL
;
605 DBG("[thread] Live viewer relay dispatcher started");
607 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
609 if (testpoint(relayd_thread_live_dispatcher
)) {
610 goto error_testpoint
;
613 health_code_update();
615 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
616 health_code_update();
618 /* Atomically prepare the queue futex */
619 futex_nto1_prepare(&viewer_conn_queue
.futex
);
622 health_code_update();
624 /* Dequeue commands */
625 node
= cds_wfq_dequeue_blocking(&viewer_conn_queue
.queue
);
627 DBG("Woken up but nothing in the live-viewer "
628 "relay command queue");
629 /* Continue thread execution */
632 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
633 DBG("Dispatching viewer request waiting on sock %d",
637 * Inform worker thread of the new request. This call is blocking
638 * so we can be assured that the data will be read at some point in
639 * time or wait to the end of the world :)
641 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
643 PERROR("write conn pipe");
644 connection_destroy(conn
);
647 } while (node
!= NULL
);
649 /* Futex wait on queue. Blocking call on futex() */
651 futex_nto1_wait(&viewer_conn_queue
.futex
);
655 /* Normal exit, no error */
662 ERR("Health error occurred in %s", __func__
);
664 health_unregister(health_relayd
);
665 DBG("Live viewer dispatch thread dying");
671 * Establish connection with the viewer and check the versions.
673 * Return 0 on success or else negative value.
676 int viewer_connect(struct relay_connection
*conn
)
679 struct lttng_viewer_connect reply
, msg
;
683 conn
->version_check_done
= 1;
685 health_code_update();
687 DBG("Viewer is establishing a connection to the relayd.");
689 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
694 health_code_update();
696 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
697 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
699 /* Major versions must be the same */
700 if (reply
.major
!= be32toh(msg
.major
)) {
701 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
702 reply
.major
, be32toh(msg
.major
));
707 conn
->major
= reply
.major
;
708 /* We adapt to the lowest compatible version */
709 if (reply
.minor
<= be32toh(msg
.minor
)) {
710 conn
->minor
= reply
.minor
;
712 conn
->minor
= be32toh(msg
.minor
);
715 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
716 conn
->type
= RELAY_VIEWER_COMMAND
;
717 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
718 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
720 ERR("Unknown connection type : %u", be32toh(msg
.type
));
725 reply
.major
= htobe32(reply
.major
);
726 reply
.minor
= htobe32(reply
.minor
);
727 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
728 reply
.viewer_session_id
= htobe64(++last_relay_viewer_session_id
);
731 health_code_update();
733 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
738 health_code_update();
740 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
748 * Send the viewer the list of current sessions.
750 * Return 0 on success or else a negative value.
753 int viewer_list_sessions(struct relay_connection
*conn
)
756 struct lttng_viewer_list_sessions session_list
;
758 long approx_before
, approx_after
;
759 struct lttng_ht_iter iter
;
760 struct lttng_viewer_session send_session
;
761 struct relay_session
*session
;
763 DBG("List sessions received");
766 cds_lfht_count_nodes(conn
->sessions_ht
->ht
, &approx_before
, &count
,
768 session_list
.sessions_count
= htobe32(count
);
770 health_code_update();
772 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
777 health_code_update();
779 cds_lfht_for_each_entry(conn
->sessions_ht
->ht
, &iter
.iter
, session
,
781 health_code_update();
783 strncpy(send_session
.session_name
, session
->session_name
,
784 sizeof(send_session
.session_name
));
785 strncpy(send_session
.hostname
, session
->hostname
,
786 sizeof(send_session
.hostname
));
787 send_session
.id
= htobe64(session
->id
);
788 send_session
.live_timer
= htobe32(session
->live_timer
);
789 send_session
.clients
= htobe32(session
->viewer_refcount
);
790 send_session
.streams
= htobe32(session
->stream_count
);
792 health_code_update();
794 ret
= send_response(conn
->sock
, &send_session
, sizeof(send_session
));
799 health_code_update();
813 * Check if a connection is attached to a session.
814 * Return 1 if attached, 0 if not attached, a negative value on error.
817 int session_attached(struct relay_connection
*conn
, uint64_t session_id
)
819 struct relay_session
*session
;
822 if (!conn
->viewer_session
) {
825 cds_list_for_each_entry(session
,
826 &conn
->viewer_session
->sessions_head
,
827 viewer_session_list
) {
828 if (session
->id
== session_id
) {
839 * Delete all streams for a specific session ID.
841 static void destroy_viewer_streams_by_session(struct relay_session
*session
)
843 struct relay_viewer_stream
*stream
;
844 struct lttng_ht_iter iter
;
849 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, stream
,
851 struct ctf_trace
*ctf_trace
;
853 health_code_update();
854 if (stream
->session_id
!= session
->id
) {
858 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
862 viewer_stream_delete(stream
);
864 if (stream
->metadata_flag
) {
865 ctf_trace
->metadata_sent
= 0;
866 ctf_trace
->viewer_metadata_stream
= NULL
;
869 viewer_stream_destroy(ctf_trace
, stream
);
874 static void try_destroy_streams(struct relay_session
*session
)
876 struct ctf_trace
*ctf_trace
;
877 struct lttng_ht_iter iter
;
881 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
883 /* Attempt to destroy the ctf trace of that session. */
884 ctf_trace_try_destroy(session
, ctf_trace
);
891 static void cleanup_session(struct relay_connection
*conn
,
892 struct relay_session
*session
)
895 * Very important that this is done before destroying the session so we
896 * can put back every viewer stream reference from the ctf_trace.
898 destroy_viewer_streams_by_session(session
);
899 try_destroy_streams(session
);
900 cds_list_del(&session
->viewer_session_list
);
901 session_viewer_try_destroy(conn
->sessions_ht
, session
);
905 * Send the viewer the list of current sessions.
908 int viewer_get_new_streams(struct relay_connection
*conn
)
910 int ret
, send_streams
= 0;
911 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0;
912 struct lttng_viewer_new_streams_request request
;
913 struct lttng_viewer_new_streams_response response
;
914 struct relay_session
*session
;
919 DBG("Get new streams received");
921 health_code_update();
923 /* Receive the request from the connected client. */
924 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
928 session_id
= be64toh(request
.session_id
);
930 health_code_update();
933 session
= session_find_by_id(conn
->sessions_ht
, session_id
);
935 DBG("Relay session %" PRIu64
" not found", session_id
);
936 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
940 if (!session_attached(conn
, session_id
)) {
942 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
947 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
953 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, NULL
, &nb_unsent
,
958 /* Only send back the newly created streams with the unsent ones. */
959 nb_streams
= nb_created
+ nb_unsent
;
960 response
.streams_count
= htobe32(nb_streams
);
963 * If the session is closed and we have no new streams to send,
964 * it means that the viewer has already received the whole trace
965 * for this session and should now close it.
967 if (nb_streams
== 0 && session
->close_flag
) {
969 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
971 * Remove the session from the attached list of the connection
972 * and try to destroy it.
974 cds_list_del(&session
->viewer_session_list
);
975 cleanup_session(conn
, session
);
980 health_code_update();
981 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
985 health_code_update();
988 * Unknown or empty session, just return gracefully, the viewer knows what
991 if (!send_streams
|| !nb_streams
) {
997 * Send stream and *DON'T* ignore the sent flag so every viewer streams
998 * that were not sent from that point will be sent to the viewer.
1000 ret
= send_viewer_streams(conn
->sock
, session
, 0);
1012 * Send the viewer the list of current sessions.
1015 int viewer_attach_session(struct relay_connection
*conn
)
1017 int send_streams
= 0;
1019 uint32_t nb_streams
= 0;
1020 enum lttng_viewer_seek seek_type
;
1021 struct lttng_viewer_attach_session_request request
;
1022 struct lttng_viewer_attach_session_response response
;
1023 struct relay_session
*session
;
1027 health_code_update();
1029 /* Receive the request from the connected client. */
1030 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1035 health_code_update();
1037 if (!conn
->viewer_session
) {
1038 DBG("Client trying to attach before creating a live viewer session");
1039 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1044 session
= session_find_by_id(conn
->sessions_ht
,
1045 be64toh(request
.session_id
));
1047 DBG("Relay session %" PRIu64
" not found",
1048 be64toh(request
.session_id
));
1049 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1052 session_viewer_attach(session
);
1053 DBG("Attach session ID %" PRIu64
" received", be64toh(request
.session_id
));
1055 if (uatomic_read(&session
->viewer_refcount
) > 1) {
1056 DBG("Already a viewer attached");
1057 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1058 session_viewer_detach(session
);
1060 } else if (session
->live_timer
== 0) {
1061 DBG("Not live session");
1062 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1066 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1067 cds_list_add(&session
->viewer_session_list
,
1068 &conn
->viewer_session
->sessions_head
);
1071 switch (be32toh(request
.seek
)) {
1072 case LTTNG_VIEWER_SEEK_BEGINNING
:
1073 case LTTNG_VIEWER_SEEK_LAST
:
1074 seek_type
= be32toh(request
.seek
);
1077 ERR("Wrong seek parameter");
1078 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1083 if (!send_streams
) {
1087 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
, NULL
);
1091 response
.streams_count
= htobe32(nb_streams
);
1094 health_code_update();
1095 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1099 health_code_update();
1102 * Unknown or empty session, just return gracefully, the viewer knows what
1105 if (!send_streams
|| !nb_streams
) {
1110 /* Send stream and ignore the sent flag. */
1111 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1123 * Send the next index for a stream.
1125 * Return 0 on success or else a negative value.
1128 int viewer_get_next_index(struct relay_connection
*conn
)
1131 struct lttng_viewer_get_next_index request_index
;
1132 struct lttng_viewer_index viewer_index
;
1133 struct ctf_packet_index packet_index
;
1134 struct relay_viewer_stream
*vstream
;
1135 struct relay_stream
*rstream
;
1136 struct ctf_trace
*ctf_trace
;
1137 struct relay_session
*session
;
1141 DBG("Viewer get next index");
1143 health_code_update();
1145 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1149 health_code_update();
1152 vstream
= viewer_stream_find_by_id(be64toh(request_index
.stream_id
));
1158 session
= session_find_by_id(conn
->sessions_ht
, vstream
->session_id
);
1164 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
, vstream
->path_name
);
1167 memset(&viewer_index
, 0, sizeof(viewer_index
));
1170 * The viewer should not ask for index on metadata stream.
1172 if (vstream
->metadata_flag
) {
1173 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1177 /* First time, we open the index file */
1178 if (vstream
->index_read_fd
< 0) {
1179 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1180 vstream
->tracefile_count
, vstream
->tracefile_count_current
);
1181 if (ret
== -ENOENT
) {
1183 * The index is created only when the first data packet arrives, it
1184 * might not be ready at the beginning of the session
1186 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1188 } else if (ret
< 0) {
1189 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1192 vstream
->index_read_fd
= ret
;
1195 rstream
= stream_find_by_id(relay_streams_ht
, vstream
->stream_handle
);
1198 if (!rstream
->close_flag
) {
1199 if (vstream
->abort_flag
) {
1200 /* Rotate on abort (overwrite). */
1201 DBG("Viewer rotate because of overwrite");
1202 ret
= viewer_stream_rotate(vstream
, rstream
);
1205 } else if (ret
== 1) {
1206 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1207 viewer_stream_delete(vstream
);
1208 viewer_stream_destroy(ctf_trace
, vstream
);
1211 /* ret == 0 means successful so we continue. */
1214 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1215 if (rstream
->tracefile_count_current
== vstream
->tracefile_count_current
) {
1216 if (rstream
->beacon_ts_end
!= -1ULL &&
1217 vstream
->last_sent_index
== rstream
->total_index_received
) {
1218 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1219 viewer_index
.timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1220 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1222 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
1223 && !vstream
->close_write_flag
) {
1225 * Reader and writer are working in the same tracefile, so we care
1226 * about the number of index received and sent. Otherwise, we read
1229 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1230 /* No new index to send, retry later. */
1231 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1235 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1236 } else if (rstream
->close_flag
&& vstream
->close_write_flag
&&
1237 vstream
->total_index_received
== vstream
->last_sent_index
) {
1238 /* Last index sent and current tracefile closed in write */
1239 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1240 viewer_stream_delete(vstream
);
1241 viewer_stream_destroy(ctf_trace
, vstream
);
1244 vstream
->close_write_flag
= 1;
1247 if (!ctf_trace
->metadata_received
||
1248 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1249 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1252 ret
= check_new_streams(vstream
->session_id
, conn
->sessions_ht
);
1255 } else if (ret
== 1) {
1256 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1259 pthread_mutex_lock(&vstream
->overwrite_lock
);
1260 if (vstream
->abort_flag
) {
1262 * The file is being overwritten by the writer, we cannot * use it.
1264 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1265 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1266 ret
= viewer_stream_rotate(vstream
, rstream
);
1269 } else if (ret
== 1) {
1270 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1271 viewer_stream_delete(vstream
);
1272 viewer_stream_destroy(ctf_trace
, vstream
);
1278 ret
= lttng_read(vstream
->index_read_fd
, &packet_index
,
1279 sizeof(packet_index
));
1280 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1281 if (ret
< sizeof(packet_index
)) {
1283 * The tracefile is closed in write, so we read up to EOF.
1285 if (vstream
->close_write_flag
== 1) {
1286 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1287 /* Rotate on normal EOF */
1288 ret
= viewer_stream_rotate(vstream
, rstream
);
1291 } else if (ret
== 1) {
1292 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1293 viewer_stream_delete(vstream
);
1294 viewer_stream_destroy(ctf_trace
, vstream
);
1298 PERROR("Relay reading index file %d", vstream
->index_read_fd
);
1299 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1303 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1304 vstream
->last_sent_index
++;
1308 * Indexes are stored in big endian, no need to switch before sending.
1310 viewer_index
.offset
= packet_index
.offset
;
1311 viewer_index
.packet_size
= packet_index
.packet_size
;
1312 viewer_index
.content_size
= packet_index
.content_size
;
1313 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1314 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1315 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1316 viewer_index
.stream_id
= packet_index
.stream_id
;
1319 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1320 health_code_update();
1322 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1326 health_code_update();
1328 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1329 vstream
->last_sent_index
, vstream
->stream_handle
);
1339 * Send the next index for a stream
1341 * Return 0 on success or else a negative value.
1344 int viewer_get_packet(struct relay_connection
*conn
)
1346 int ret
, send_data
= 0;
1350 struct lttng_viewer_get_packet get_packet_info
;
1351 struct lttng_viewer_trace_packet reply
;
1352 struct relay_viewer_stream
*stream
;
1353 struct relay_session
*session
;
1354 struct ctf_trace
*ctf_trace
;
1358 DBG2("Relay get data packet");
1360 health_code_update();
1362 ret
= recv_request(conn
->sock
, &get_packet_info
, sizeof(get_packet_info
));
1366 health_code_update();
1368 /* From this point on, the error label can be reached. */
1369 memset(&reply
, 0, sizeof(reply
));
1372 stream
= viewer_stream_find_by_id(be64toh(get_packet_info
.stream_id
));
1377 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1383 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1388 * First time we read this stream, we need open the tracefile, we should
1389 * only arrive here if an index has already been sent to the viewer, so the
1390 * tracefile must exist, if it does not it is a fatal error.
1392 if (stream
->read_fd
< 0) {
1393 char fullpath
[PATH_MAX
];
1395 if (stream
->tracefile_count
> 0) {
1396 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
, stream
->path_name
,
1397 stream
->channel_name
,
1398 stream
->tracefile_count_current
);
1400 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1401 stream
->channel_name
);
1406 ret
= open(fullpath
, O_RDONLY
);
1408 PERROR("Relay opening trace file");
1411 stream
->read_fd
= ret
;
1414 if (!ctf_trace
->metadata_received
||
1415 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1416 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1417 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1421 ret
= check_new_streams(stream
->session_id
, conn
->sessions_ht
);
1424 } else if (ret
== 1) {
1425 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1426 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1430 len
= be32toh(get_packet_info
.len
);
1431 data
= zmalloc(len
);
1433 PERROR("relay data zmalloc");
1437 ret
= lseek(stream
->read_fd
, be64toh(get_packet_info
.offset
), SEEK_SET
);
1440 * If the read fd was closed by the streaming side, the
1441 * abort_flag will be set to 1, otherwise it is an error.
1443 if (stream
->abort_flag
== 0) {
1447 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1450 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1451 if (read_len
< len
) {
1453 * If the read fd was closed by the streaming side, the
1454 * abort_flag will be set to 1, otherwise it is an error.
1456 if (stream
->abort_flag
== 0) {
1457 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1459 be64toh(get_packet_info
.offset
));
1462 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1466 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1467 reply
.len
= htobe32(len
);
1472 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1475 reply
.flags
= htobe32(reply
.flags
);
1477 health_code_update();
1479 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1483 health_code_update();
1486 health_code_update();
1487 ret
= send_response(conn
->sock
, data
, len
);
1491 health_code_update();
1494 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1495 be64toh(get_packet_info
.stream_id
));
1506 * Send the session's metadata
1508 * Return 0 on success else a negative value.
1511 int viewer_get_metadata(struct relay_connection
*conn
)
1517 struct lttng_viewer_get_metadata request
;
1518 struct lttng_viewer_metadata_packet reply
;
1519 struct relay_viewer_stream
*stream
;
1520 struct ctf_trace
*ctf_trace
;
1521 struct relay_session
*session
;
1525 DBG("Relay get metadata");
1527 health_code_update();
1529 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1533 health_code_update();
1536 stream
= viewer_stream_find_by_id(be64toh(request
.stream_id
));
1537 if (!stream
|| !stream
->metadata_flag
) {
1538 ERR("Invalid metadata stream");
1542 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1548 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1551 assert(ctf_trace
->metadata_sent
<= ctf_trace
->metadata_received
);
1553 len
= ctf_trace
->metadata_received
- ctf_trace
->metadata_sent
;
1555 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1559 /* first time, we open the metadata file */
1560 if (stream
->read_fd
< 0) {
1561 char fullpath
[PATH_MAX
];
1563 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1564 stream
->channel_name
);
1568 ret
= open(fullpath
, O_RDONLY
);
1570 PERROR("Relay opening metadata file");
1573 stream
->read_fd
= ret
;
1576 reply
.len
= htobe64(len
);
1577 data
= zmalloc(len
);
1579 PERROR("viewer metadata zmalloc");
1583 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1584 if (read_len
< len
) {
1585 PERROR("Relay reading metadata file");
1588 ctf_trace
->metadata_sent
+= read_len
;
1589 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1593 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1596 health_code_update();
1597 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1601 health_code_update();
1604 ret
= send_response(conn
->sock
, data
, len
);
1610 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1611 be64toh(request
.stream_id
));
1613 DBG("Metadata sent");
1623 * Create a viewer session.
1625 * Return 0 on success or else a negative value.
1628 int viewer_create_session(struct relay_connection
*conn
)
1631 struct lttng_viewer_create_session_response resp
;
1633 DBG("Viewer create session received");
1635 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1636 conn
->viewer_session
= zmalloc(sizeof(conn
->viewer_session
));
1637 if (!conn
->viewer_session
) {
1638 ERR("Allocation viewer session");
1639 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1642 CDS_INIT_LIST_HEAD(&conn
->viewer_session
->sessions_head
);
1645 health_code_update();
1646 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1650 health_code_update();
1659 * live_relay_unknown_command: send -1 if received unknown command
1662 void live_relay_unknown_command(struct relay_connection
*conn
)
1664 struct lttcomm_relayd_generic_reply reply
;
1666 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1667 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1671 * Process the commands received on the control socket
1674 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1675 struct relay_connection
*conn
)
1683 msg_value
= be32toh(recv_hdr
->cmd
);
1686 * Make sure we've done the version check before any command other then a
1687 * new client connection.
1689 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1690 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1695 switch (msg_value
) {
1696 case LTTNG_VIEWER_CONNECT
:
1697 ret
= viewer_connect(conn
);
1699 case LTTNG_VIEWER_LIST_SESSIONS
:
1700 ret
= viewer_list_sessions(conn
);
1702 case LTTNG_VIEWER_ATTACH_SESSION
:
1703 ret
= viewer_attach_session(conn
);
1705 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1706 ret
= viewer_get_next_index(conn
);
1708 case LTTNG_VIEWER_GET_PACKET
:
1709 ret
= viewer_get_packet(conn
);
1711 case LTTNG_VIEWER_GET_METADATA
:
1712 ret
= viewer_get_metadata(conn
);
1714 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1715 ret
= viewer_get_new_streams(conn
);
1717 case LTTNG_VIEWER_CREATE_SESSION
:
1718 ret
= viewer_create_session(conn
);
1721 ERR("Received unknown viewer command (%u)", be32toh(recv_hdr
->cmd
));
1722 live_relay_unknown_command(conn
);
1732 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1738 (void) lttng_poll_del(events
, pollfd
);
1740 ret
= close(pollfd
);
1742 ERR("Closing pollfd %d", pollfd
);
1747 * Delete and destroy a connection.
1749 * RCU read side lock MUST be acquired.
1751 static void destroy_connection(struct lttng_ht
*relay_connections_ht
,
1752 struct relay_connection
*conn
)
1754 struct relay_session
*session
, *tmp_session
;
1756 assert(relay_connections_ht
);
1759 connection_delete(relay_connections_ht
, conn
);
1761 if (!conn
->viewer_session
) {
1766 cds_list_for_each_entry_safe(session
, tmp_session
,
1767 &conn
->viewer_session
->sessions_head
,
1768 viewer_session_list
) {
1769 DBG("Cleaning connection of session ID %" PRIu64
, session
->id
);
1770 cleanup_session(conn
, session
);
1775 connection_destroy(conn
);
1779 * This thread does the actual work
1782 void *thread_worker(void *data
)
1786 struct relay_connection
*conn
;
1787 struct lttng_poll_event events
;
1788 struct lttng_ht
*relay_connections_ht
;
1789 struct lttng_ht_iter iter
;
1790 struct lttng_viewer_cmd recv_hdr
;
1791 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
1792 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
1794 DBG("[thread] Live viewer relay worker started");
1796 rcu_register_thread();
1798 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1800 if (testpoint(relayd_thread_live_worker
)) {
1801 goto error_testpoint
;
1804 /* table of connections indexed on socket */
1805 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1806 if (!relay_connections_ht
) {
1807 goto relay_connections_ht_error
;
1810 ret
= create_thread_poll_set(&events
, 2);
1812 goto error_poll_create
;
1815 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1824 health_code_update();
1826 /* Infinite blocking call, waiting for transmission */
1827 DBG3("Relayd live viewer worker thread polling...");
1828 health_poll_entry();
1829 ret
= lttng_poll_wait(&events
, -1);
1833 * Restart interrupted system call.
1835 if (errno
== EINTR
) {
1844 * Process control. The control connection is prioritised so we don't
1845 * starve it with high throughput tracing data on the data
1848 for (i
= 0; i
< nb_fd
; i
++) {
1849 /* Fetch once the poll data */
1850 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1851 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1853 health_code_update();
1855 /* Thread quit pipe has been closed. Killing thread. */
1856 ret
= check_live_conn_pipe(pollfd
, revents
);
1862 /* Inspect the relay conn pipe for new connection */
1863 if (pollfd
== live_conn_pipe
[0]) {
1864 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1865 ERR("Relay live pipe error");
1867 } else if (revents
& LPOLLIN
) {
1868 ret
= lttng_read(live_conn_pipe
[0], &conn
, sizeof(conn
));
1872 conn
->sessions_ht
= sessions_ht
;
1873 connection_init(conn
);
1874 lttng_poll_add(&events
, conn
->sock
->fd
,
1875 LPOLLIN
| LPOLLRDHUP
);
1877 lttng_ht_add_unique_ulong(relay_connections_ht
,
1880 DBG("Connection socket %d added", conn
->sock
->fd
);
1884 conn
= connection_find_by_sock(relay_connections_ht
, pollfd
);
1885 /* If not found, there is a synchronization issue. */
1888 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1889 cleanup_connection_pollfd(&events
, pollfd
);
1890 destroy_connection(relay_connections_ht
, conn
);
1891 } else if (revents
& LPOLLIN
) {
1892 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1893 sizeof(recv_hdr
), 0);
1895 /* Connection closed */
1896 cleanup_connection_pollfd(&events
, pollfd
);
1897 destroy_connection(relay_connections_ht
, conn
);
1898 DBG("Viewer control conn closed with %d", pollfd
);
1900 ret
= process_control(&recv_hdr
, conn
);
1902 /* Clear the session on error. */
1903 cleanup_connection_pollfd(&events
, pollfd
);
1904 destroy_connection(relay_connections_ht
, conn
);
1905 DBG("Viewer connection closed with %d", pollfd
);
1916 lttng_poll_clean(&events
);
1918 /* Cleanup reamaining connection object. */
1920 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, conn
,
1922 health_code_update();
1923 destroy_connection(relay_connections_ht
, conn
);
1927 lttng_ht_destroy(relay_connections_ht
);
1928 relay_connections_ht_error
:
1929 /* Close relay conn pipes */
1930 utils_close_pipe(live_conn_pipe
);
1932 DBG("Viewer worker thread exited with error");
1934 DBG("Viewer worker thread cleanup complete");
1938 ERR("Health error occurred in %s", __func__
);
1940 health_unregister(health_relayd
);
1942 rcu_unregister_thread();
1947 * Create the relay command pipe to wake thread_manage_apps.
1948 * Closed in cleanup().
1950 static int create_conn_pipe(void)
1954 ret
= utils_create_pipe_cloexec(live_conn_pipe
);
1959 void live_stop_threads(void)
1966 ret
= pthread_join(live_listener_thread
, &status
);
1968 PERROR("pthread_join live listener");
1969 goto error
; /* join error, exit without cleanup */
1972 ret
= pthread_join(live_worker_thread
, &status
);
1974 PERROR("pthread_join live worker");
1975 goto error
; /* join error, exit without cleanup */
1978 ret
= pthread_join(live_dispatcher_thread
, &status
);
1980 PERROR("pthread_join live dispatcher");
1981 goto error
; /* join error, exit without cleanup */
1993 int live_start_threads(struct lttng_uri
*uri
,
1994 struct relay_local_data
*relay_ctx
)
2003 /* Check if daemon is UID = 0 */
2004 is_root
= !getuid();
2007 if (live_uri
->port
< 1024) {
2008 ERR("Need to be root to use ports < 1024");
2014 /* Setup the thread apps communication pipe. */
2015 if ((ret
= create_conn_pipe()) < 0) {
2019 /* Init relay command queue. */
2020 cds_wfq_init(&viewer_conn_queue
.queue
);
2022 /* Set up max poll set size */
2023 lttng_poll_set_max_size();
2025 /* Setup the dispatcher thread */
2026 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2027 thread_dispatcher
, (void *) NULL
);
2029 PERROR("pthread_create viewer dispatcher");
2030 goto exit_dispatcher
;
2033 /* Setup the worker thread */
2034 ret
= pthread_create(&live_worker_thread
, NULL
,
2035 thread_worker
, relay_ctx
);
2037 PERROR("pthread_create viewer worker");
2041 /* Setup the listener thread */
2042 ret
= pthread_create(&live_listener_thread
, NULL
,
2043 thread_listener
, (void *) NULL
);
2045 PERROR("pthread_create viewer listener");
2053 ret
= pthread_join(live_listener_thread
, &status
);
2055 PERROR("pthread_join live listener");
2056 goto error
; /* join error, exit without cleanup */
2060 ret
= pthread_join(live_worker_thread
, &status
);
2062 PERROR("pthread_join live worker");
2063 goto error
; /* join error, exit without cleanup */
2067 ret
= pthread_join(live_dispatcher_thread
, &status
);
2069 PERROR("pthread_join live dispatcher");
2070 goto error
; /* join error, exit without cleanup */