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/sessiond-comm/sessiond-comm.h>
49 #include <common/sessiond-comm/inet.h>
50 #include <common/sessiond-comm/relayd.h>
51 #include <common/uri.h>
52 #include <common/utils.h>
56 #include "lttng-relayd.h"
57 #include "lttng-viewer.h"
59 #include "health-relayd.h"
61 static struct lttng_uri
*live_uri
;
64 * Quit pipe for all threads. This permits a single cancellation point
65 * for all threads when receiving an event on the pipe.
67 static int live_thread_quit_pipe
[2] = { -1, -1 };
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_relay_cmd_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_cmd_queue viewer_cmd_queue
;
90 static uint64_t last_relay_viewer_session_id
;
104 * Write to writable pipe used to notify a thread.
107 int notify_thread_pipe(int wpipe
)
111 ret
= lttng_write(wpipe
, "!", 1);
113 PERROR("write poll pipe");
120 * Stop all threads by closing the thread quit pipe.
123 void stop_threads(void)
127 /* Stopping all threads */
128 DBG("Terminating all live threads");
129 ret
= notify_thread_pipe(live_thread_quit_pipe
[1]);
131 ERR("write error on thread quit pipe");
134 /* Dispatch thread */
135 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
136 futex_nto1_wake(&viewer_cmd_queue
.futex
);
140 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
143 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
147 if (events
== NULL
|| size
== 0) {
152 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
158 ret
= lttng_poll_add(events
, live_thread_quit_pipe
[0], LPOLLIN
);
170 * Check if the thread quit pipe was triggered.
172 * Return 1 if it was triggered else 0;
175 int check_thread_quit_pipe(int fd
, uint32_t events
)
177 if (fd
== live_thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
185 * Create and init socket from uri.
188 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
191 struct lttcomm_sock
*sock
= NULL
;
193 sock
= lttcomm_alloc_sock_from_uri(uri
);
195 ERR("Allocating socket");
199 ret
= lttcomm_create_sock(sock
);
203 DBG("Listening on sock %d for live", sock
->fd
);
205 ret
= sock
->ops
->bind(sock
);
210 ret
= sock
->ops
->listen(sock
, -1);
220 lttcomm_destroy_sock(sock
);
226 * This thread manages the listening for new connections on the network
229 void *thread_listener(void *data
)
231 int i
, ret
, pollfd
, err
= -1;
233 uint32_t revents
, nb_fd
;
234 struct lttng_poll_event events
;
235 struct lttcomm_sock
*live_control_sock
;
237 DBG("[thread] Relay live listener started");
239 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
241 health_code_update();
243 live_control_sock
= init_socket(live_uri
);
244 if (!live_control_sock
) {
245 goto error_sock_control
;
249 * Pass 3 as size here for the thread quit pipe, control and data socket.
251 ret
= create_thread_poll_set(&events
, 2);
253 goto error_create_poll
;
256 /* Add the control socket */
257 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
263 health_code_update();
265 DBG("Listener accepting live viewers connections");
269 ret
= lttng_poll_wait(&events
, -1);
273 * Restart interrupted system call.
275 if (errno
== EINTR
) {
282 DBG("Relay new viewer connection received");
283 for (i
= 0; i
< nb_fd
; i
++) {
284 health_code_update();
286 /* Fetch once the poll data */
287 revents
= LTTNG_POLL_GETEV(&events
, i
);
288 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
290 /* Thread quit pipe has been closed. Killing thread. */
291 ret
= check_thread_quit_pipe(pollfd
, revents
);
297 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
298 ERR("socket poll error");
300 } else if (revents
& LPOLLIN
) {
302 * Get allocated in this thread, enqueued to a global queue,
303 * dequeued and freed in the worker thread.
305 struct relay_command
*relay_cmd
;
306 struct lttcomm_sock
*newsock
;
308 relay_cmd
= zmalloc(sizeof(*relay_cmd
));
310 PERROR("relay command zmalloc");
314 assert(pollfd
== live_control_sock
->fd
);
315 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
317 PERROR("accepting control sock");
321 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
322 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
325 PERROR("setsockopt inet");
326 lttcomm_destroy_sock(newsock
);
330 relay_cmd
->sock
= newsock
;
333 * Lock free enqueue the request.
335 cds_wfq_enqueue(&viewer_cmd_queue
.queue
, &relay_cmd
->node
);
338 * Wake the dispatch queue futex. Implicit memory
339 * barrier with the exchange in cds_wfq_enqueue.
341 futex_nto1_wake(&viewer_cmd_queue
.futex
);
349 lttng_poll_clean(&events
);
351 if (live_control_sock
->fd
>= 0) {
352 ret
= live_control_sock
->ops
->close(live_control_sock
);
357 lttcomm_destroy_sock(live_control_sock
);
361 DBG("Live viewer listener thread exited with error");
363 health_unregister(health_relayd
);
364 DBG("Live viewer listener thread cleanup complete");
370 * This thread manages the dispatching of the requests to worker threads
373 void *thread_dispatcher(void *data
)
377 struct cds_wfq_node
*node
;
378 struct relay_command
*relay_cmd
= NULL
;
380 DBG("[thread] Live viewer relay dispatcher started");
382 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
384 health_code_update();
386 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
387 health_code_update();
389 /* Atomically prepare the queue futex */
390 futex_nto1_prepare(&viewer_cmd_queue
.futex
);
393 health_code_update();
395 /* Dequeue commands */
396 node
= cds_wfq_dequeue_blocking(&viewer_cmd_queue
.queue
);
398 DBG("Woken up but nothing in the live-viewer "
399 "relay command queue");
400 /* Continue thread execution */
404 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
405 DBG("Dispatching viewer request waiting on sock %d",
406 relay_cmd
->sock
->fd
);
409 * Inform worker thread of the new request. This call is blocking
410 * so we can be assured that the data will be read at some point in
411 * time or wait to the end of the world :)
413 ret
= lttng_write(live_relay_cmd_pipe
[1], relay_cmd
,
416 if (ret
< sizeof(struct relay_command
)) {
417 PERROR("write cmd pipe");
420 } while (node
!= NULL
);
422 /* Futex wait on queue. Blocking call on futex() */
424 futex_nto1_wait(&viewer_cmd_queue
.futex
);
428 /* Normal exit, no error */
434 ERR("Health error occurred in %s", __func__
);
436 health_unregister(health_relayd
);
437 DBG("Live viewer dispatch thread dying");
443 * Establish connection with the viewer and check the versions.
445 * Return 0 on success or else negative value.
448 int viewer_connect(struct relay_command
*cmd
)
451 struct lttng_viewer_connect reply
, msg
;
455 cmd
->version_check_done
= 1;
457 health_code_update();
459 /* Get version from the other side. */
460 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
461 if (ret
< 0 || ret
!= sizeof(msg
)) {
463 /* Orderly shutdown. Not necessary to print an error. */
464 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
466 ERR("Relay failed to receive the version values.");
472 health_code_update();
474 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
475 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
477 /* Major versions must be the same */
478 if (reply
.major
!= be32toh(msg
.major
)) {
479 DBG("Incompatible major versions (%u vs %u)", reply
.major
,
485 cmd
->major
= reply
.major
;
486 /* We adapt to the lowest compatible version */
487 if (reply
.minor
<= be32toh(msg
.minor
)) {
488 cmd
->minor
= reply
.minor
;
490 cmd
->minor
= be32toh(msg
.minor
);
493 if (be32toh(msg
.type
) == VIEWER_CLIENT_COMMAND
) {
494 cmd
->type
= RELAY_VIEWER_COMMAND
;
495 } else if (be32toh(msg
.type
) == VIEWER_CLIENT_NOTIFICATION
) {
496 cmd
->type
= RELAY_VIEWER_NOTIFICATION
;
498 ERR("Unknown connection type : %u", be32toh(msg
.type
));
503 reply
.major
= htobe32(reply
.major
);
504 reply
.minor
= htobe32(reply
.minor
);
505 if (cmd
->type
== RELAY_VIEWER_COMMAND
) {
506 reply
.viewer_session_id
= htobe64(++last_relay_viewer_session_id
);
509 health_code_update();
511 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
512 sizeof(struct lttng_viewer_connect
), 0);
514 ERR("Relay sending version");
517 health_code_update();
519 DBG("Version check done using protocol %u.%u", cmd
->major
, cmd
->minor
);
527 * Send the viewer the list of current sessions.
529 * Return 0 on success or else a negative value.
532 int viewer_list_sessions(struct relay_command
*cmd
,
533 struct lttng_ht
*sessions_ht
)
536 struct lttng_viewer_list_sessions session_list
;
538 long approx_before
, approx_after
;
539 struct lttng_ht_node_ulong
*node
;
540 struct lttng_ht_iter iter
;
541 struct lttng_viewer_session send_session
;
542 struct relay_session
*session
;
544 DBG("List sessions received");
546 if (cmd
->version_check_done
== 0) {
547 ERR("Trying to list sessions before version check");
553 cds_lfht_count_nodes(sessions_ht
->ht
, &approx_before
, &count
, &approx_after
);
554 session_list
.sessions_count
= htobe32(count
);
556 health_code_update();
558 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &session_list
,
559 sizeof(session_list
), 0);
561 ERR("Relay sending sessions list");
565 health_code_update();
567 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, node
, node
) {
568 health_code_update();
570 node
= lttng_ht_iter_get_node_ulong(&iter
);
574 session
= caa_container_of(node
, struct relay_session
, session_n
);
576 strncpy(send_session
.session_name
, session
->session_name
,
577 sizeof(send_session
.session_name
));
578 strncpy(send_session
.hostname
, session
->hostname
,
579 sizeof(send_session
.hostname
));
580 send_session
.id
= htobe64(session
->id
);
581 send_session
.live_timer
= htobe32(session
->live_timer
);
582 send_session
.clients
= htobe32(session
->viewer_attached
);
583 send_session
.streams
= htobe32(session
->stream_count
);
585 health_code_update();
587 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &send_session
,
588 sizeof(send_session
), 0);
590 ERR("Relay sending session info");
594 health_code_update();
609 * Open index file using a given viewer stream.
611 * Return 0 on success or else a negative value.
613 static int open_index(struct relay_viewer_stream
*stream
)
616 char fullpath
[PATH_MAX
];
617 struct lttng_packet_index_file_hdr hdr
;
619 if (stream
->tracefile_count
> 0) {
620 ret
= snprintf(fullpath
, sizeof(fullpath
), "%s/" DEFAULT_INDEX_DIR
"/%s_%"
621 PRIu64 DEFAULT_INDEX_FILE_SUFFIX
, stream
->path_name
,
622 stream
->channel_name
, stream
->tracefile_count_current
);
624 ret
= snprintf(fullpath
, sizeof(fullpath
), "%s/" DEFAULT_INDEX_DIR
"/%s"
625 DEFAULT_INDEX_FILE_SUFFIX
, stream
->path_name
,
626 stream
->channel_name
);
629 PERROR("snprintf index path");
633 DBG("Opening index file %s in read only", fullpath
);
634 ret
= open(fullpath
, O_RDONLY
);
636 if (errno
== ENOENT
) {
640 PERROR("opening index in read-only");
644 stream
->index_read_fd
= ret
;
645 DBG("Opening index file %s in read only, (fd: %d)", fullpath
, ret
);
647 ret
= lttng_read(stream
->index_read_fd
, &hdr
, sizeof(hdr
));
648 if (ret
< sizeof(hdr
)) {
649 PERROR("Reading index header");
652 if (strncmp(hdr
.magic
, INDEX_MAGIC
, sizeof(hdr
.magic
)) != 0) {
653 ERR("Invalid header magic");
657 if (be32toh(hdr
.index_major
) != INDEX_MAJOR
||
658 be32toh(hdr
.index_minor
) != INDEX_MINOR
) {
659 ERR("Invalid header version");
670 * Allocate and init a new viewer_stream.
672 * Copies the values from the stream passed in parameter and insert the new
673 * stream in the viewer_streams_ht.
675 * MUST be called with rcu_read_lock held.
677 * Returns 0 on success or a negative value on error.
680 int init_viewer_stream(struct relay_stream
*stream
, int seek_last
)
683 struct relay_viewer_stream
*viewer_stream
;
687 viewer_stream
= zmalloc(sizeof(*viewer_stream
));
688 if (!viewer_stream
) {
689 PERROR("relay viewer stream zmalloc");
693 viewer_stream
->session_id
= stream
->session
->id
;
694 viewer_stream
->stream_handle
= stream
->stream_handle
;
695 viewer_stream
->path_name
= strndup(stream
->path_name
,
696 LTTNG_VIEWER_PATH_MAX
);
697 viewer_stream
->channel_name
= strndup(stream
->channel_name
,
698 LTTNG_VIEWER_NAME_MAX
);
699 viewer_stream
->tracefile_count
= stream
->tracefile_count
;
700 viewer_stream
->metadata_flag
= stream
->metadata_flag
;
702 viewer_stream
->tracefile_count_current
=
703 stream
->tracefile_count_current
;
705 viewer_stream
->tracefile_count_current
=
706 stream
->oldest_tracefile_id
;
710 * The deletion of this ctf_trace object is only done in a call RCU of the
711 * relay stream making it valid as long as we have the read side lock.
713 viewer_stream
->ctf_trace
= stream
->ctf_trace
;
714 uatomic_inc(&viewer_stream
->ctf_trace
->refcount
);
716 lttng_ht_node_init_u64(&viewer_stream
->stream_n
, stream
->stream_handle
);
717 lttng_ht_add_unique_u64(viewer_streams_ht
, &viewer_stream
->stream_n
);
719 viewer_stream
->index_read_fd
= -1;
720 viewer_stream
->read_fd
= -1;
723 * This is to avoid a race between the initialization of this object and
724 * the close of the given stream. If the stream is unable to find this
725 * viewer stream when closing, this copy will at least take the latest
727 * We also need that for the seek_last.
729 viewer_stream
->total_index_received
= stream
->total_index_received
;
732 * If we never received an index for the current stream, delay
733 * the opening of the index, otherwise open it right now.
735 if (viewer_stream
->tracefile_count_current
==
736 stream
->tracefile_count_current
&&
737 viewer_stream
->total_index_received
== 0) {
738 viewer_stream
->index_read_fd
= -1;
740 ret
= open_index(viewer_stream
);
746 if (seek_last
&& viewer_stream
->index_read_fd
> 0) {
747 ret
= lseek(viewer_stream
->index_read_fd
,
748 viewer_stream
->total_index_received
*
749 sizeof(struct lttng_packet_index
),
754 viewer_stream
->last_sent_index
=
755 viewer_stream
->total_index_received
;
765 * Rotate a stream to the next tracefile.
767 * Returns 0 on success, a negative value on error.
770 int rotate_viewer_stream(struct relay_viewer_stream
*viewer_stream
,
771 struct relay_stream
*stream
)
774 uint64_t tracefile_id
;
776 assert(viewer_stream
);
778 tracefile_id
= (viewer_stream
->tracefile_count_current
+ 1) %
779 viewer_stream
->tracefile_count
;
782 pthread_mutex_lock(&stream
->viewer_stream_rotation_lock
);
785 * The writer and the reader are not working in the same
786 * tracefile, we can read up to EOF, we don't care about the
787 * total_index_received.
789 if (!stream
|| (stream
->tracefile_count_current
!= tracefile_id
)) {
790 viewer_stream
->close_write_flag
= 1;
793 * We are opening a file that is still open in write, make
794 * sure we limit our reading to the number of indexes
797 viewer_stream
->close_write_flag
= 0;
799 viewer_stream
->total_index_received
=
800 stream
->total_index_received
;
803 viewer_stream
->tracefile_count_current
= tracefile_id
;
805 ret
= close(viewer_stream
->index_read_fd
);
807 PERROR("close index file %d",
808 viewer_stream
->index_read_fd
);
810 viewer_stream
->index_read_fd
= -1;
811 ret
= close(viewer_stream
->read_fd
);
813 PERROR("close tracefile %d",
814 viewer_stream
->read_fd
);
816 viewer_stream
->read_fd
= -1;
818 pthread_mutex_lock(&viewer_stream
->overwrite_lock
);
819 viewer_stream
->abort_flag
= 0;
820 pthread_mutex_unlock(&viewer_stream
->overwrite_lock
);
822 viewer_stream
->index_read_fd
= -1;
823 viewer_stream
->read_fd
= -1;
826 pthread_mutex_unlock(&stream
->viewer_stream_rotation_lock
);
828 ret
= open_index(viewer_stream
);
840 * Send the viewer the list of current sessions.
843 int viewer_attach_session(struct relay_command
*cmd
,
844 struct lttng_ht
*sessions_ht
)
846 int ret
, send_streams
= 0, nb_streams
= 0;
847 struct lttng_viewer_attach_session_request request
;
848 struct lttng_viewer_attach_session_response response
;
849 struct lttng_viewer_stream send_stream
;
850 struct relay_stream
*stream
;
851 struct relay_viewer_stream
*viewer_stream
;
852 struct lttng_ht_node_ulong
*node
;
853 struct lttng_ht_node_u64
*node64
;
854 struct lttng_ht_iter iter
;
855 struct relay_session
*session
;
861 DBG("Attach session received");
863 if (cmd
->version_check_done
== 0) {
864 ERR("Trying to attach session before version check");
869 health_code_update();
871 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &request
, sizeof(request
), 0);
872 if (ret
< 0 || ret
!= sizeof(request
)) {
874 /* Orderly shutdown. Not necessary to print an error. */
875 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
877 ERR("Relay failed to receive the attach parameters.");
883 health_code_update();
886 lttng_ht_lookup(sessions_ht
,
887 (void *)((unsigned long) be64toh(request
.session_id
)), &iter
);
888 node
= lttng_ht_iter_get_node_ulong(&iter
);
890 DBG("Relay session %" PRIu64
" not found",
891 be64toh(request
.session_id
));
892 response
.status
= htobe32(VIEWER_ATTACH_UNK
);
896 session
= caa_container_of(node
, struct relay_session
, session_n
);
897 if (cmd
->session_id
== session
->id
) {
898 /* Same viewer already attached, just send the stream list. */
900 response
.status
= htobe32(VIEWER_ATTACH_OK
);
901 } else if (session
->viewer_attached
!= 0) {
902 DBG("Already a viewer attached");
903 response
.status
= htobe32(VIEWER_ATTACH_ALREADY
);
905 } else if (session
->live_timer
== 0) {
906 DBG("Not live session");
907 response
.status
= htobe32(VIEWER_ATTACH_NOT_LIVE
);
910 session
->viewer_attached
++;
912 response
.status
= htobe32(VIEWER_ATTACH_OK
);
913 cmd
->session_id
= session
->id
;
914 cmd
->session
= session
;
917 switch (be32toh(request
.seek
)) {
918 case VIEWER_SEEK_BEGINNING
:
919 /* Default behaviour. */
921 case VIEWER_SEEK_LAST
:
925 ERR("Wrong seek parameter");
926 response
.status
= htobe32(VIEWER_ATTACH_SEEK_ERR
);
932 /* We should only be there if we have a session to attach to. */
936 * Fill the viewer_streams_ht to count the number of streams
937 * ready to be sent and avoid concurrency issues on the
938 * relay_streams_ht and don't rely on a total session stream count.
940 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, node
, node
) {
941 struct relay_viewer_stream
*vstream
;
943 health_code_update();
945 node
= lttng_ht_iter_get_node_ulong(&iter
);
949 stream
= caa_container_of(node
, struct relay_stream
, stream_n
);
950 if (stream
->session
!= cmd
->session
) {
955 * Don't send streams with no ctf_trace, they are not ready to be
958 if (!stream
->ctf_trace
) {
962 vstream
= live_find_viewer_stream_by_id(stream
->stream_handle
);
964 ret
= init_viewer_stream(stream
, seek_last
);
971 response
.streams_count
= htobe32(nb_streams
);
975 health_code_update();
976 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &response
, sizeof(response
), 0);
978 ERR("Relay sending viewer attach response");
981 health_code_update();
984 * Unknown or busy session, just return gracefully, the viewer knows what
992 /* We should only be there if we have a session to attach to. */
994 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, node
, node
) {
995 health_code_update();
997 node64
= lttng_ht_iter_get_node_u64(&iter
);
1001 viewer_stream
= caa_container_of(node64
, struct relay_viewer_stream
,
1003 if (viewer_stream
->session_id
!= cmd
->session
->id
) {
1007 send_stream
.id
= htobe64(viewer_stream
->stream_handle
);
1008 send_stream
.ctf_trace_id
= htobe64(viewer_stream
->ctf_trace
->id
);
1009 send_stream
.metadata_flag
= htobe32(viewer_stream
->metadata_flag
);
1010 strncpy(send_stream
.path_name
, viewer_stream
->path_name
,
1011 sizeof(send_stream
.path_name
));
1012 strncpy(send_stream
.channel_name
, viewer_stream
->channel_name
,
1013 sizeof(send_stream
.channel_name
));
1015 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &send_stream
,
1016 sizeof(send_stream
), 0);
1018 ERR("Relay sending stream %" PRIu64
, viewer_stream
->stream_handle
);
1021 DBG("Sent stream %" PRIu64
" to viewer", viewer_stream
->stream_handle
);
1033 * Get viewer stream from stream id.
1035 * RCU read side lock MUST be acquired.
1037 struct relay_viewer_stream
*live_find_viewer_stream_by_id(uint64_t stream_id
)
1039 struct lttng_ht_node_u64
*node
;
1040 struct lttng_ht_iter iter
;
1041 struct relay_viewer_stream
*stream
= NULL
;
1043 lttng_ht_lookup(viewer_streams_ht
, &stream_id
, &iter
);
1044 node
= lttng_ht_iter_get_node_u64(&iter
);
1046 DBG("Relay viewer stream %" PRIu64
" not found", stream_id
);
1049 stream
= caa_container_of(node
, struct relay_viewer_stream
, stream_n
);
1056 * Send the next index for a stream.
1058 * Return 0 on success or else a negative value.
1061 int viewer_get_next_index(struct relay_command
*cmd
,
1062 struct lttng_ht
*sessions_ht
)
1065 struct lttng_viewer_get_next_index request_index
;
1066 struct lttng_viewer_index viewer_index
;
1067 struct lttng_packet_index packet_index
;
1068 struct relay_viewer_stream
*vstream
;
1069 struct relay_stream
*rstream
;
1072 assert(sessions_ht
);
1074 DBG("Viewer get next index");
1076 if (cmd
->version_check_done
== 0) {
1077 ERR("Trying to request index before version check");
1079 goto end_no_session
;
1082 health_code_update();
1083 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &request_index
,
1084 sizeof(request_index
), 0);
1085 if (ret
< 0 || ret
!= sizeof(request_index
)) {
1087 ERR("Relay didn't receive the whole packet");
1090 health_code_update();
1093 vstream
= live_find_viewer_stream_by_id(be64toh(request_index
.stream_id
));
1099 memset(&viewer_index
, 0, sizeof(viewer_index
));
1102 * The viewer should not ask for index on metadata stream.
1104 if (vstream
->metadata_flag
) {
1105 viewer_index
.status
= htobe32(VIEWER_INDEX_HUP
);
1109 /* First time, we open the index file */
1110 if (vstream
->index_read_fd
< 0) {
1111 ret
= open_index(vstream
);
1112 if (ret
== -ENOENT
) {
1114 * The index is created only when the first data packet arrives, it
1115 * might not be ready at the beginning of the session
1117 viewer_index
.status
= htobe32(VIEWER_INDEX_RETRY
);
1119 } else if (ret
< 0) {
1120 viewer_index
.status
= htobe32(VIEWER_INDEX_ERR
);
1125 rstream
= relay_stream_find_by_id(vstream
->stream_handle
);
1127 if (vstream
->abort_flag
) {
1128 /* Rotate on abort (overwrite). */
1129 DBG("Viewer rotate because of overwrite");
1130 ret
= rotate_viewer_stream(vstream
, rstream
);
1135 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1136 if (rstream
->tracefile_count_current
== vstream
->tracefile_count_current
) {
1137 if (rstream
->beacon_ts_end
!= -1ULL &&
1138 vstream
->last_sent_index
== rstream
->total_index_received
) {
1139 viewer_index
.status
= htobe32(VIEWER_INDEX_INACTIVE
);
1140 viewer_index
.timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1141 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1144 * Reader and writer are working in the same tracefile, so we care
1145 * about the number of index received and sent. Otherwise, we read
1148 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
1149 && !vstream
->close_write_flag
) {
1150 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1151 /* No new index to send, retry later. */
1152 viewer_index
.status
= htobe32(VIEWER_INDEX_RETRY
);
1156 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1157 } else if (!rstream
&& vstream
->close_write_flag
&&
1158 vstream
->total_index_received
== vstream
->last_sent_index
) {
1159 /* Last index sent and current tracefile closed in write */
1160 viewer_index
.status
= htobe32(VIEWER_INDEX_HUP
);
1163 vstream
->close_write_flag
= 1;
1166 if (!vstream
->ctf_trace
->metadata_received
||
1167 vstream
->ctf_trace
->metadata_received
>
1168 vstream
->ctf_trace
->metadata_sent
) {
1169 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1172 pthread_mutex_lock(&vstream
->overwrite_lock
);
1173 if (vstream
->abort_flag
) {
1175 * The file is being overwritten by the writer, we cannot
1178 viewer_index
.status
= htobe32(VIEWER_INDEX_RETRY
);
1179 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1180 ret
= rotate_viewer_stream(vstream
, rstream
);
1186 ret
= lttng_read(vstream
->index_read_fd
, &packet_index
,
1187 sizeof(packet_index
));
1188 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1189 if (ret
< sizeof(packet_index
)) {
1191 * The tracefile is closed in write, so we read up to EOF.
1193 if (vstream
->close_write_flag
== 1) {
1194 viewer_index
.status
= htobe32(VIEWER_INDEX_RETRY
);
1195 /* Rotate on normal EOF */
1196 ret
= rotate_viewer_stream(vstream
, rstream
);
1201 PERROR("Relay reading index file %d",
1202 vstream
->index_read_fd
);
1203 viewer_index
.status
= htobe32(VIEWER_INDEX_ERR
);
1207 viewer_index
.status
= htobe32(VIEWER_INDEX_OK
);
1208 vstream
->last_sent_index
++;
1212 * Indexes are stored in big endian, no need to switch before sending.
1214 viewer_index
.offset
= packet_index
.offset
;
1215 viewer_index
.packet_size
= packet_index
.packet_size
;
1216 viewer_index
.content_size
= packet_index
.content_size
;
1217 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1218 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1219 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1220 viewer_index
.stream_id
= packet_index
.stream_id
;
1223 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1224 health_code_update();
1225 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &viewer_index
,
1226 sizeof(viewer_index
), 0);
1228 ERR("Relay index to viewer");
1231 health_code_update();
1233 DBG("Index %" PRIu64
"for stream %" PRIu64
"sent",
1234 vstream
->last_sent_index
, vstream
->stream_handle
);
1245 * Send the next index for a stream
1247 * Return 0 on success or else a negative value.
1250 int viewer_get_packet(struct relay_command
*cmd
)
1252 int ret
, send_data
= 0;
1256 struct lttng_viewer_get_packet get_packet_info
;
1257 struct lttng_viewer_trace_packet reply
;
1258 struct relay_viewer_stream
*stream
;
1262 DBG2("Relay get data packet");
1264 if (cmd
->version_check_done
== 0) {
1265 ERR("Trying to get packet before version check");
1270 health_code_update();
1271 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &get_packet_info
,
1272 sizeof(get_packet_info
), 0);
1273 if (ret
< 0 || ret
!= sizeof(get_packet_info
)) {
1275 ERR("Relay didn't receive the whole packet");
1278 health_code_update();
1280 /* From this point on, the error label can be reached. */
1281 memset(&reply
, 0, sizeof(reply
));
1284 stream
= live_find_viewer_stream_by_id(be64toh(get_packet_info
.stream_id
));
1288 assert(stream
->ctf_trace
);
1291 * First time we read this stream, we need open the tracefile, we should
1292 * only arrive here if an index has already been sent to the viewer, so the
1293 * tracefile must exist, if it does not it is a fatal error.
1295 if (stream
->read_fd
< 0) {
1296 char fullpath
[PATH_MAX
];
1298 if (stream
->tracefile_count
> 0) {
1299 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
, stream
->path_name
,
1300 stream
->channel_name
,
1301 stream
->tracefile_count_current
);
1303 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1304 stream
->channel_name
);
1309 ret
= open(fullpath
, O_RDONLY
);
1311 PERROR("Relay opening trace file");
1314 stream
->read_fd
= ret
;
1317 if (!stream
->ctf_trace
->metadata_received
||
1318 stream
->ctf_trace
->metadata_received
>
1319 stream
->ctf_trace
->metadata_sent
) {
1320 reply
.status
= htobe32(VIEWER_GET_PACKET_ERR
);
1321 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1325 len
= be32toh(get_packet_info
.len
);
1326 data
= zmalloc(len
);
1328 PERROR("relay data zmalloc");
1332 ret
= lseek(stream
->read_fd
, be64toh(get_packet_info
.offset
), SEEK_SET
);
1335 * If the read fd was closed by the streaming side, the
1336 * abort_flag will be set to 1, otherwise it is an error.
1338 if (stream
->abort_flag
== 0) {
1342 reply
.status
= htobe32(VIEWER_GET_PACKET_EOF
);
1345 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1346 if (read_len
< len
) {
1348 * If the read fd was closed by the streaming side, the
1349 * abort_flag will be set to 1, otherwise it is an error.
1351 if (stream
->abort_flag
== 0) {
1352 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1354 be64toh(get_packet_info
.offset
));
1357 reply
.status
= htobe32(VIEWER_GET_PACKET_EOF
);
1361 reply
.status
= htobe32(VIEWER_GET_PACKET_OK
);
1362 reply
.len
= htobe32(len
);
1367 reply
.status
= htobe32(VIEWER_GET_PACKET_ERR
);
1370 reply
.flags
= htobe32(reply
.flags
);
1372 health_code_update();
1373 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1375 ERR("Relay data header to viewer");
1378 health_code_update();
1381 health_code_update();
1382 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, data
, len
, 0);
1384 ERR("Relay send data to viewer");
1387 health_code_update();
1390 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1391 be64toh(get_packet_info
.stream_id
));
1402 * Send the session's metadata
1404 * Return 0 on success else a negative value.
1407 int viewer_get_metadata(struct relay_command
*cmd
)
1413 struct lttng_viewer_get_metadata request
;
1414 struct lttng_viewer_metadata_packet reply
;
1415 struct relay_viewer_stream
*stream
;
1419 DBG("Relay get metadata");
1421 if (cmd
->version_check_done
== 0) {
1422 ERR("Trying to get metadata before version check");
1427 health_code_update();
1428 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &request
,
1429 sizeof(request
), 0);
1430 if (ret
< 0 || ret
!= sizeof(request
)) {
1432 ERR("Relay didn't receive the whole packet");
1435 health_code_update();
1438 stream
= live_find_viewer_stream_by_id(be64toh(request
.stream_id
));
1439 if (!stream
|| !stream
->metadata_flag
) {
1440 ERR("Invalid metadata stream");
1443 assert(stream
->ctf_trace
);
1444 assert(stream
->ctf_trace
->metadata_sent
<=
1445 stream
->ctf_trace
->metadata_received
);
1447 len
= stream
->ctf_trace
->metadata_received
-
1448 stream
->ctf_trace
->metadata_sent
;
1450 reply
.status
= htobe32(VIEWER_NO_NEW_METADATA
);
1454 /* first time, we open the metadata file */
1455 if (stream
->read_fd
< 0) {
1456 char fullpath
[PATH_MAX
];
1458 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1459 stream
->channel_name
);
1463 ret
= open(fullpath
, O_RDONLY
);
1465 PERROR("Relay opening metadata file");
1468 stream
->read_fd
= ret
;
1471 reply
.len
= htobe64(len
);
1472 data
= zmalloc(len
);
1474 PERROR("viewer metadata zmalloc");
1478 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1479 if (read_len
< len
) {
1480 PERROR("Relay reading metadata file");
1483 stream
->ctf_trace
->metadata_sent
+= read_len
;
1484 reply
.status
= htobe32(VIEWER_METADATA_OK
);
1488 reply
.status
= htobe32(VIEWER_METADATA_ERR
);
1491 health_code_update();
1492 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1494 ERR("Relay data header to viewer");
1497 health_code_update();
1500 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, data
, len
, 0);
1502 ERR("Relay send data to viewer");
1507 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1508 be64toh(request
.stream_id
));
1510 DBG("Metadata sent");
1520 * live_relay_unknown_command: send -1 if received unknown command
1523 void live_relay_unknown_command(struct relay_command
*cmd
)
1525 struct lttcomm_relayd_generic_reply reply
;
1528 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1529 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1530 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1532 ERR("Relay sending unknown command");
1537 * Process the commands received on the control socket
1540 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1541 struct relay_command
*cmd
, struct lttng_ht
*sessions_ht
)
1545 switch (be32toh(recv_hdr
->cmd
)) {
1546 case VIEWER_CONNECT
:
1547 ret
= viewer_connect(cmd
);
1549 case VIEWER_LIST_SESSIONS
:
1550 ret
= viewer_list_sessions(cmd
, sessions_ht
);
1552 case VIEWER_ATTACH_SESSION
:
1553 ret
= viewer_attach_session(cmd
, sessions_ht
);
1555 case VIEWER_GET_NEXT_INDEX
:
1556 ret
= viewer_get_next_index(cmd
, sessions_ht
);
1558 case VIEWER_GET_PACKET
:
1559 ret
= viewer_get_packet(cmd
);
1561 case VIEWER_GET_METADATA
:
1562 ret
= viewer_get_metadata(cmd
);
1565 ERR("Received unknown viewer command (%u)", be32toh(recv_hdr
->cmd
));
1566 live_relay_unknown_command(cmd
);
1576 void cleanup_poll_connection(struct lttng_poll_event
*events
, int pollfd
)
1582 lttng_poll_del(events
, pollfd
);
1584 ret
= close(pollfd
);
1586 ERR("Closing pollfd %d", pollfd
);
1591 * Create and add connection to the given hash table.
1593 * Return poll add value or else -1 on error.
1596 int add_connection(int fd
, struct lttng_poll_event
*events
,
1597 struct lttng_ht
*relay_connections_ht
)
1600 struct relay_command
*relay_connection
;
1603 assert(relay_connections_ht
);
1605 relay_connection
= zmalloc(sizeof(struct relay_command
));
1606 if (relay_connection
== NULL
) {
1607 PERROR("Relay command zmalloc");
1611 ret
= lttng_read(fd
, relay_connection
, sizeof(*relay_connection
));
1612 if (ret
< sizeof(*relay_connection
)) {
1613 PERROR("read relay cmd pipe");
1617 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
1618 (unsigned long) relay_connection
->sock
->fd
);
1620 lttng_ht_add_unique_ulong(relay_connections_ht
,
1621 &relay_connection
->sock_n
);
1624 return lttng_poll_add(events
, relay_connection
->sock
->fd
,
1625 LPOLLIN
| LPOLLRDHUP
);
1628 free(relay_connection
);
1634 void deferred_free_connection(struct rcu_head
*head
)
1636 struct relay_command
*relay_connection
=
1637 caa_container_of(head
, struct relay_command
, rcu_node
);
1639 if (relay_connection
->session
&&
1640 relay_connection
->session
->viewer_attached
> 0) {
1641 relay_connection
->session
->viewer_attached
--;
1643 lttcomm_destroy_sock(relay_connection
->sock
);
1644 free(relay_connection
);
1648 void deferred_free_viewer_stream(struct rcu_head
*head
)
1650 struct relay_viewer_stream
*stream
=
1651 caa_container_of(head
, struct relay_viewer_stream
, rcu_node
);
1653 if (stream
->ctf_trace
) {
1654 uatomic_dec(&stream
->ctf_trace
->refcount
);
1655 assert(uatomic_read(&stream
->ctf_trace
->refcount
) >= 0);
1656 if (uatomic_read(&stream
->ctf_trace
->refcount
) == 0) {
1657 DBG("Freeing ctf_trace %" PRIu64
, stream
->ctf_trace
->id
);
1658 free(stream
->ctf_trace
);
1662 free(stream
->path_name
);
1663 free(stream
->channel_name
);
1668 void viewer_del_streams(uint64_t session_id
)
1671 struct relay_viewer_stream
*stream
;
1672 struct lttng_ht_node_u64
*node
;
1673 struct lttng_ht_iter iter
;
1676 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, node
, node
) {
1677 health_code_update();
1679 node
= lttng_ht_iter_get_node_u64(&iter
);
1684 stream
= caa_container_of(node
, struct relay_viewer_stream
, stream_n
);
1685 if (stream
->session_id
!= session_id
) {
1689 if (stream
->read_fd
>= 0) {
1690 ret
= close(stream
->read_fd
);
1692 PERROR("close read_fd");
1695 if (stream
->index_read_fd
>= 0) {
1696 ret
= close(stream
->index_read_fd
);
1698 PERROR("close index_read_fd");
1701 if (stream
->metadata_flag
&& stream
->ctf_trace
) {
1702 stream
->ctf_trace
->metadata_sent
= 0;
1704 ret
= lttng_ht_del(viewer_streams_ht
, &iter
);
1706 call_rcu(&stream
->rcu_node
, deferred_free_viewer_stream
);
1712 * Delete and free a connection.
1714 * RCU read side lock MUST be acquired.
1717 void del_connection(struct lttng_ht
*relay_connections_ht
,
1718 struct lttng_ht_iter
*iter
, struct relay_command
*relay_connection
)
1722 assert(relay_connections_ht
);
1724 assert(relay_connection
);
1726 ret
= lttng_ht_del(relay_connections_ht
, iter
);
1729 viewer_del_streams(relay_connection
->session_id
);
1731 call_rcu(&relay_connection
->rcu_node
, deferred_free_connection
);
1735 * This thread does the actual work
1738 void *thread_worker(void *data
)
1742 struct relay_command
*relay_connection
;
1743 struct lttng_poll_event events
;
1744 struct lttng_ht
*relay_connections_ht
;
1745 struct lttng_ht_node_ulong
*node
;
1746 struct lttng_ht_iter iter
;
1747 struct lttng_viewer_cmd recv_hdr
;
1748 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
1749 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
1751 DBG("[thread] Live viewer relay worker started");
1753 rcu_register_thread();
1755 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1757 /* table of connections indexed on socket */
1758 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1759 if (!relay_connections_ht
) {
1760 goto relay_connections_ht_error
;
1763 ret
= create_thread_poll_set(&events
, 2);
1765 goto error_poll_create
;
1768 ret
= lttng_poll_add(&events
, live_relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1777 health_code_update();
1779 /* Infinite blocking call, waiting for transmission */
1780 DBG3("Relayd live viewer worker thread polling...");
1781 health_poll_entry();
1782 ret
= lttng_poll_wait(&events
, -1);
1786 * Restart interrupted system call.
1788 if (errno
== EINTR
) {
1797 * Process control. The control connection is prioritised so we don't
1798 * starve it with high throughput tracing data on the data
1801 for (i
= 0; i
< nb_fd
; i
++) {
1802 /* Fetch once the poll data */
1803 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1804 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1806 health_code_update();
1808 /* Thread quit pipe has been closed. Killing thread. */
1809 ret
= check_thread_quit_pipe(pollfd
, revents
);
1815 /* Inspect the relay cmd pipe for new connection */
1816 if (pollfd
== live_relay_cmd_pipe
[0]) {
1817 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1818 ERR("Relay live pipe error");
1820 } else if (revents
& LPOLLIN
) {
1821 DBG("Relay live viewer command received");
1822 ret
= add_connection(live_relay_cmd_pipe
[0],
1823 &events
, relay_connections_ht
);
1828 } else if (revents
) {
1830 lttng_ht_lookup(relay_connections_ht
,
1831 (void *)((unsigned long) pollfd
), &iter
);
1832 node
= lttng_ht_iter_get_node_ulong(&iter
);
1834 DBG2("Relay viewer sock %d not found", pollfd
);
1838 relay_connection
= caa_container_of(node
, struct relay_command
,
1841 if (revents
& (LPOLLERR
)) {
1842 cleanup_poll_connection(&events
, pollfd
);
1843 del_connection(relay_connections_ht
, &iter
,
1845 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
1846 DBG("Viewer socket %d hung up", pollfd
);
1847 cleanup_poll_connection(&events
, pollfd
);
1848 del_connection(relay_connections_ht
, &iter
,
1850 } else if (revents
& LPOLLIN
) {
1851 ret
= relay_connection
->sock
->ops
->recvmsg(
1852 relay_connection
->sock
, &recv_hdr
,
1853 sizeof(struct lttng_viewer_cmd
),
1855 /* connection closed */
1857 cleanup_poll_connection(&events
, pollfd
);
1858 del_connection(relay_connections_ht
, &iter
,
1860 DBG("Viewer control connection closed with %d",
1863 if (relay_connection
->session
) {
1864 DBG2("Relay viewer worker receiving data for "
1865 "session: %" PRIu64
,
1866 relay_connection
->session
->id
);
1868 ret
= process_control(&recv_hdr
, relay_connection
,
1871 /* Clear the session on error. */
1872 cleanup_poll_connection(&events
, pollfd
);
1873 del_connection(relay_connections_ht
, &iter
,
1875 DBG("Viewer connection closed with %d", pollfd
);
1886 lttng_poll_clean(&events
);
1888 /* empty the hash table and free the memory */
1890 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
1891 health_code_update();
1893 node
= lttng_ht_iter_get_node_ulong(&iter
);
1898 relay_connection
= caa_container_of(node
, struct relay_command
,
1900 del_connection(relay_connections_ht
, &iter
, relay_connection
);
1904 lttng_ht_destroy(relay_connections_ht
);
1905 relay_connections_ht_error
:
1906 /* Close relay cmd pipes */
1907 utils_close_pipe(live_relay_cmd_pipe
);
1909 DBG("Viewer worker thread exited with error");
1911 DBG("Viewer worker thread cleanup complete");
1914 ERR("Health error occurred in %s", __func__
);
1916 health_unregister(health_relayd
);
1918 rcu_unregister_thread();
1923 * Create the relay command pipe to wake thread_manage_apps.
1924 * Closed in cleanup().
1926 static int create_relay_cmd_pipe(void)
1930 ret
= utils_create_pipe_cloexec(live_relay_cmd_pipe
);
1935 void live_stop_threads(void)
1942 ret
= pthread_join(live_listener_thread
, &status
);
1944 PERROR("pthread_join live listener");
1945 goto error
; /* join error, exit without cleanup */
1948 ret
= pthread_join(live_worker_thread
, &status
);
1950 PERROR("pthread_join live worker");
1951 goto error
; /* join error, exit without cleanup */
1954 ret
= pthread_join(live_dispatcher_thread
, &status
);
1956 PERROR("pthread_join live dispatcher");
1957 goto error
; /* join error, exit without cleanup */
1969 int live_start_threads(struct lttng_uri
*uri
,
1970 struct relay_local_data
*relay_ctx
, int quit_pipe
[2])
1979 live_thread_quit_pipe
[0] = quit_pipe
[0];
1980 live_thread_quit_pipe
[1] = quit_pipe
[1];
1982 /* Check if daemon is UID = 0 */
1983 is_root
= !getuid();
1986 if (live_uri
->port
< 1024) {
1987 ERR("Need to be root to use ports < 1024");
1993 /* Setup the thread apps communication pipe. */
1994 if ((ret
= create_relay_cmd_pipe()) < 0) {
1998 /* Init relay command queue. */
1999 cds_wfq_init(&viewer_cmd_queue
.queue
);
2001 /* Set up max poll set size */
2002 lttng_poll_set_max_size();
2004 /* Setup the dispatcher thread */
2005 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2006 thread_dispatcher
, (void *) NULL
);
2008 PERROR("pthread_create viewer dispatcher");
2009 goto exit_dispatcher
;
2012 /* Setup the worker thread */
2013 ret
= pthread_create(&live_worker_thread
, NULL
,
2014 thread_worker
, relay_ctx
);
2016 PERROR("pthread_create viewer worker");
2020 /* Setup the listener thread */
2021 ret
= pthread_create(&live_listener_thread
, NULL
,
2022 thread_listener
, (void *) NULL
);
2024 PERROR("pthread_create viewer listener");
2032 ret
= pthread_join(live_listener_thread
, &status
);
2034 PERROR("pthread_join live listener");
2035 goto error
; /* join error, exit without cleanup */
2039 ret
= pthread_join(live_worker_thread
, &status
);
2041 PERROR("pthread_join live worker");
2042 goto error
; /* join error, exit without cleanup */
2046 ret
= pthread_join(live_dispatcher_thread
, &status
);
2048 PERROR("pthread_join live dispatcher");
2049 goto error
; /* join error, exit without cleanup */