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.
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
37 #include <urcu/futex.h>
38 #include <urcu/uatomic.h>
43 #include <lttng/lttng.h>
44 #include <common/common.h>
45 #include <common/compat/poll.h>
46 #include <common/compat/socket.h>
47 #include <common/compat/endian.h>
48 #include <common/defaults.h>
49 #include <common/futex.h>
50 #include <common/index/index.h>
51 #include <common/sessiond-comm/sessiond-comm.h>
52 #include <common/sessiond-comm/inet.h>
53 #include <common/sessiond-comm/relayd.h>
54 #include <common/uri.h>
55 #include <common/utils.h>
59 #include "lttng-relayd.h"
61 #include "health-relayd.h"
62 #include "testpoint.h"
63 #include "viewer-stream.h"
66 #include "ctf-trace.h"
67 #include "connection.h"
69 static struct lttng_uri
*live_uri
;
72 * This pipe is used to inform the worker thread that a command is queued and
73 * ready to be processed.
75 static int live_conn_pipe
[2] = { -1, -1 };
77 /* Shared between threads */
78 static int live_dispatch_thread_exit
;
80 static pthread_t live_listener_thread
;
81 static pthread_t live_dispatcher_thread
;
82 static pthread_t live_worker_thread
;
85 * Relay command queue.
87 * The live_thread_listener and live_thread_dispatcher communicate with this
90 static struct relay_conn_queue viewer_conn_queue
;
92 static uint64_t last_relay_viewer_session_id
;
98 void cleanup_relayd_live(void)
106 * Receive a request buffer using a given socket, destination allocated buffer
109 * Return the size of the received message or else a negative value on error
110 * with errno being set by recvmsg() syscall.
113 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
120 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
121 if (ret
< 0 || ret
!= size
) {
123 /* Orderly shutdown. Not necessary to print an error. */
124 DBG("Socket %d did an orderly shutdown", sock
->fd
);
126 ERR("Relay failed to receive request.");
135 * Send a response buffer using a given socket, source allocated buffer of
138 * Return the size of the sent message or else a negative value on error with
139 * errno being set by sendmsg() syscall.
142 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
149 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
151 ERR("Relayd failed to send response.");
158 * Atomically check if new streams got added in one of the sessions attached
159 * and reset the flag to 0.
161 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
165 int check_new_streams(struct relay_connection
*conn
)
167 struct relay_session
*session
;
168 unsigned long current_val
;
171 if (!conn
->viewer_session
) {
174 cds_list_for_each_entry(session
,
175 &conn
->viewer_session
->sessions_head
,
176 viewer_session_list
) {
177 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
189 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
190 * this function should ignore the sent flag or not.
192 * Return 0 on success or else a negative value.
195 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
196 struct relay_session
*session
, unsigned int ignore_sent_flag
)
199 struct lttng_viewer_stream send_stream
;
200 struct lttng_ht_iter iter
;
201 struct relay_viewer_stream
*vstream
;
207 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
209 struct ctf_trace
*ctf_trace
;
211 health_code_update();
213 /* Ignore if not the same session. */
214 if (vstream
->session_id
!= session
->id
||
215 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
219 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
223 send_stream
.id
= htobe64(vstream
->stream_handle
);
224 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
225 send_stream
.metadata_flag
= htobe32(vstream
->metadata_flag
);
226 strncpy(send_stream
.path_name
, vstream
->path_name
,
227 sizeof(send_stream
.path_name
));
228 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
229 sizeof(send_stream
.channel_name
));
231 DBG("Sending stream %" PRIu64
" to viewer", vstream
->stream_handle
);
232 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
236 vstream
->sent_flag
= 1;
247 * Create every viewer stream possible for the given session with the seek
248 * type. Three counters *can* be return which are in order the total amount of
249 * viewer stream of the session, the number of unsent stream and the number of
250 * stream created. Those counters can be NULL and thus will be ignored.
252 * Return 0 on success or else a negative value.
255 int make_viewer_streams(struct relay_session
*session
,
256 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
257 uint32_t *nb_created
)
260 struct lttng_ht_iter iter
;
261 struct ctf_trace
*ctf_trace
;
266 * This is to make sure we create viewer streams for a full received
267 * channel. For instance, if we have 8 streams for a channel that are
268 * concurrently being flagged ready, we can end up creating just a subset
269 * of the 8 streams (the ones that are flagged). This lock avoids this
272 pthread_mutex_lock(&session
->viewer_ready_lock
);
275 * Create viewer streams for relay streams that are ready to be used for a
276 * the given session id only.
279 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
281 struct relay_stream
*stream
;
283 health_code_update();
285 if (ctf_trace
->invalid_flag
) {
289 cds_list_for_each_entry(stream
, &ctf_trace
->stream_list
, trace_list
) {
290 struct relay_viewer_stream
*vstream
;
292 if (!stream
->viewer_ready
) {
296 vstream
= viewer_stream_find_by_id(stream
->stream_handle
);
298 vstream
= viewer_stream_create(stream
, seek_t
, ctf_trace
);
303 /* Acquire reference to ctf_trace. */
304 ctf_trace_get_ref(ctf_trace
);
307 /* Update number of created stream counter. */
310 } else if (!vstream
->sent_flag
&& nb_unsent
) {
311 /* Update number of unsent stream counter. */
314 /* Update number of total stream counter. */
325 pthread_mutex_unlock(&session
->viewer_ready_lock
);
329 int relayd_live_stop(void)
331 /* Stop dispatch thread */
332 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
333 futex_nto1_wake(&viewer_conn_queue
.futex
);
338 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
341 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
345 if (events
== NULL
|| size
== 0) {
350 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
356 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
368 * Check if the thread quit pipe was triggered.
370 * Return 1 if it was triggered else 0;
373 int check_thread_quit_pipe(int fd
, uint32_t events
)
375 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
383 * Create and init socket from uri.
386 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
389 struct lttcomm_sock
*sock
= NULL
;
391 sock
= lttcomm_alloc_sock_from_uri(uri
);
393 ERR("Allocating socket");
397 ret
= lttcomm_create_sock(sock
);
401 DBG("Listening on sock %d for live", sock
->fd
);
403 ret
= sock
->ops
->bind(sock
);
408 ret
= sock
->ops
->listen(sock
, -1);
418 lttcomm_destroy_sock(sock
);
424 * This thread manages the listening for new connections on the network
427 void *thread_listener(void *data
)
429 int i
, ret
, pollfd
, err
= -1;
430 uint32_t revents
, nb_fd
;
431 struct lttng_poll_event events
;
432 struct lttcomm_sock
*live_control_sock
;
434 DBG("[thread] Relay live listener started");
436 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
438 health_code_update();
440 live_control_sock
= init_socket(live_uri
);
441 if (!live_control_sock
) {
442 goto error_sock_control
;
445 /* Pass 2 as size here for the thread quit pipe and control sockets. */
446 ret
= create_thread_poll_set(&events
, 2);
448 goto error_create_poll
;
451 /* Add the control socket */
452 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
457 lttng_relay_notify_ready();
459 if (testpoint(relayd_thread_live_listener
)) {
460 goto error_testpoint
;
464 health_code_update();
466 DBG("Listener accepting live viewers connections");
470 ret
= lttng_poll_wait(&events
, -1);
474 * Restart interrupted system call.
476 if (errno
== EINTR
) {
483 DBG("Relay new viewer connection received");
484 for (i
= 0; i
< nb_fd
; i
++) {
485 health_code_update();
487 /* Fetch once the poll data */
488 revents
= LTTNG_POLL_GETEV(&events
, i
);
489 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
491 /* Thread quit pipe has been closed. Killing thread. */
492 ret
= check_thread_quit_pipe(pollfd
, revents
);
498 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
499 ERR("socket poll error");
501 } else if (revents
& LPOLLIN
) {
503 * Get allocated in this thread, enqueued to a global queue,
504 * dequeued and freed in the worker thread.
507 struct relay_connection
*new_conn
;
508 struct lttcomm_sock
*newsock
;
510 new_conn
= connection_create();
515 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
517 PERROR("accepting control sock");
518 connection_free(new_conn
);
521 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
523 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
526 PERROR("setsockopt inet");
527 lttcomm_destroy_sock(newsock
);
528 connection_free(new_conn
);
531 new_conn
->sock
= newsock
;
533 /* Enqueue request for the dispatcher thread. */
534 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
538 * Wake the dispatch queue futex. Implicit memory barrier with
539 * the exchange in cds_wfcq_enqueue.
541 futex_nto1_wake(&viewer_conn_queue
.futex
);
550 lttng_poll_clean(&events
);
552 if (live_control_sock
->fd
>= 0) {
553 ret
= live_control_sock
->ops
->close(live_control_sock
);
558 lttcomm_destroy_sock(live_control_sock
);
562 DBG("Live viewer listener thread exited with error");
564 health_unregister(health_relayd
);
565 DBG("Live viewer listener thread cleanup complete");
566 if (lttng_relay_stop_threads()) {
567 ERR("Error stopping threads");
573 * This thread manages the dispatching of the requests to worker threads
576 void *thread_dispatcher(void *data
)
580 struct cds_wfcq_node
*node
;
581 struct relay_connection
*conn
= NULL
;
583 DBG("[thread] Live viewer relay dispatcher started");
585 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
587 if (testpoint(relayd_thread_live_dispatcher
)) {
588 goto error_testpoint
;
591 health_code_update();
593 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
594 health_code_update();
596 /* Atomically prepare the queue futex */
597 futex_nto1_prepare(&viewer_conn_queue
.futex
);
600 health_code_update();
602 /* Dequeue commands */
603 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
604 &viewer_conn_queue
.tail
);
606 DBG("Woken up but nothing in the live-viewer "
607 "relay command queue");
608 /* Continue thread execution */
611 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
612 DBG("Dispatching viewer request waiting on sock %d",
616 * Inform worker thread of the new request. This call is blocking
617 * so we can be assured that the data will be read at some point in
618 * time or wait to the end of the world :)
620 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
622 PERROR("write conn pipe");
623 connection_destroy(conn
);
626 } while (node
!= NULL
);
628 /* Futex wait on queue. Blocking call on futex() */
630 futex_nto1_wait(&viewer_conn_queue
.futex
);
634 /* Normal exit, no error */
641 ERR("Health error occurred in %s", __func__
);
643 health_unregister(health_relayd
);
644 DBG("Live viewer dispatch thread dying");
645 if (lttng_relay_stop_threads()) {
646 ERR("Error stopping threads");
652 * Establish connection with the viewer and check the versions.
654 * Return 0 on success or else negative value.
657 int viewer_connect(struct relay_connection
*conn
)
660 struct lttng_viewer_connect reply
, msg
;
664 conn
->version_check_done
= 1;
666 health_code_update();
668 DBG("Viewer is establishing a connection to the relayd.");
670 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
675 health_code_update();
677 memset(&reply
, 0, sizeof(reply
));
678 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
679 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
681 /* Major versions must be the same */
682 if (reply
.major
!= be32toh(msg
.major
)) {
683 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
684 reply
.major
, be32toh(msg
.major
));
689 conn
->major
= reply
.major
;
690 /* We adapt to the lowest compatible version */
691 if (reply
.minor
<= be32toh(msg
.minor
)) {
692 conn
->minor
= reply
.minor
;
694 conn
->minor
= be32toh(msg
.minor
);
697 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
698 conn
->type
= RELAY_VIEWER_COMMAND
;
699 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
700 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
702 ERR("Unknown connection type : %u", be32toh(msg
.type
));
707 reply
.major
= htobe32(reply
.major
);
708 reply
.minor
= htobe32(reply
.minor
);
709 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
710 reply
.viewer_session_id
= htobe64(++last_relay_viewer_session_id
);
713 health_code_update();
715 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
720 health_code_update();
722 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
730 * Send the viewer the list of current sessions.
732 * Return 0 on success or else a negative value.
735 int viewer_list_sessions(struct relay_connection
*conn
)
738 struct lttng_viewer_list_sessions session_list
;
740 long approx_before
, approx_after
;
741 struct lttng_ht_iter iter
;
742 struct lttng_viewer_session send_session
;
743 struct relay_session
*session
;
745 DBG("List sessions received");
748 cds_lfht_count_nodes(conn
->sessions_ht
->ht
, &approx_before
, &count
,
750 session_list
.sessions_count
= htobe32(count
);
752 health_code_update();
754 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
759 health_code_update();
761 cds_lfht_for_each_entry(conn
->sessions_ht
->ht
, &iter
.iter
, session
,
763 health_code_update();
765 strncpy(send_session
.session_name
, session
->session_name
,
766 sizeof(send_session
.session_name
));
767 strncpy(send_session
.hostname
, session
->hostname
,
768 sizeof(send_session
.hostname
));
769 send_session
.id
= htobe64(session
->id
);
770 send_session
.live_timer
= htobe32(session
->live_timer
);
771 send_session
.clients
= htobe32(session
->viewer_refcount
);
772 send_session
.streams
= htobe32(session
->stream_count
);
774 health_code_update();
776 ret
= send_response(conn
->sock
, &send_session
, sizeof(send_session
));
781 health_code_update();
790 * Check if a connection is attached to a session.
791 * Return 1 if attached, 0 if not attached, a negative value on error.
794 int session_attached(struct relay_connection
*conn
, uint64_t session_id
)
796 struct relay_session
*session
;
799 if (!conn
->viewer_session
) {
802 cds_list_for_each_entry(session
,
803 &conn
->viewer_session
->sessions_head
,
804 viewer_session_list
) {
805 if (session
->id
== session_id
) {
816 * Delete all streams for a specific session ID.
818 static void destroy_viewer_streams_by_session(struct relay_session
*session
)
820 struct relay_viewer_stream
*stream
;
821 struct lttng_ht_iter iter
;
826 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, stream
,
828 struct ctf_trace
*ctf_trace
;
830 health_code_update();
831 if (stream
->session_id
!= session
->id
) {
835 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
839 viewer_stream_delete(stream
);
841 if (stream
->metadata_flag
) {
842 ctf_trace
->metadata_sent
= 0;
843 ctf_trace
->viewer_metadata_stream
= NULL
;
846 viewer_stream_destroy(ctf_trace
, stream
);
851 static void try_destroy_streams(struct relay_session
*session
)
853 struct ctf_trace
*ctf_trace
;
854 struct lttng_ht_iter iter
;
858 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
860 /* Attempt to destroy the ctf trace of that session. */
861 ctf_trace_try_destroy(session
, ctf_trace
);
868 static void cleanup_session(struct relay_connection
*conn
,
869 struct relay_session
*session
)
872 * Very important that this is done before destroying the session so we
873 * can put back every viewer stream reference from the ctf_trace.
875 destroy_viewer_streams_by_session(session
);
876 try_destroy_streams(session
);
877 cds_list_del(&session
->viewer_session_list
);
878 session_viewer_try_destroy(conn
->sessions_ht
, session
);
882 * Send the viewer the list of current sessions.
885 int viewer_get_new_streams(struct relay_connection
*conn
)
887 int ret
, send_streams
= 0;
888 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0;
889 struct lttng_viewer_new_streams_request request
;
890 struct lttng_viewer_new_streams_response response
;
891 struct relay_session
*session
;
896 DBG("Get new streams received");
898 health_code_update();
900 /* Receive the request from the connected client. */
901 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
905 session_id
= be64toh(request
.session_id
);
907 health_code_update();
909 memset(&response
, 0, sizeof(response
));
912 session
= session_find_by_id(conn
->sessions_ht
, session_id
);
914 DBG("Relay session %" PRIu64
" not found", session_id
);
915 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
919 if (!session_attached(conn
, session_id
)) {
921 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
926 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
928 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, NULL
, &nb_unsent
,
933 /* Only send back the newly created streams with the unsent ones. */
934 nb_streams
= nb_created
+ nb_unsent
;
935 response
.streams_count
= htobe32(nb_streams
);
938 * If the session is closed and we have no new streams to send,
939 * it means that the viewer has already received the whole trace
940 * for this session and should now close it.
942 if (nb_streams
== 0 && session
->close_flag
) {
944 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
946 * Remove the session from the attached list of the connection
947 * and try to destroy it.
949 cds_list_del(&session
->viewer_session_list
);
950 cleanup_session(conn
, session
);
955 health_code_update();
956 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
960 health_code_update();
963 * Unknown or empty session, just return gracefully, the viewer knows what
966 if (!send_streams
|| !nb_streams
) {
972 * Send stream and *DON'T* ignore the sent flag so every viewer streams
973 * that were not sent from that point will be sent to the viewer.
975 ret
= send_viewer_streams(conn
->sock
, session
, 0);
987 * Send the viewer the list of current sessions.
990 int viewer_attach_session(struct relay_connection
*conn
)
992 int send_streams
= 0;
994 uint32_t nb_streams
= 0;
995 enum lttng_viewer_seek seek_type
;
996 struct lttng_viewer_attach_session_request request
;
997 struct lttng_viewer_attach_session_response response
;
998 struct relay_session
*session
;
1002 health_code_update();
1004 /* Receive the request from the connected client. */
1005 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1010 health_code_update();
1012 memset(&response
, 0, sizeof(response
));
1014 if (!conn
->viewer_session
) {
1015 DBG("Client trying to attach before creating a live viewer session");
1016 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1021 session
= session_find_by_id(conn
->sessions_ht
,
1022 be64toh(request
.session_id
));
1024 DBG("Relay session %" PRIu64
" not found",
1025 be64toh(request
.session_id
));
1026 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1029 session_viewer_attach(session
);
1030 DBG("Attach session ID %" PRIu64
" received", be64toh(request
.session_id
));
1032 if (uatomic_read(&session
->viewer_refcount
) > 1) {
1033 DBG("Already a viewer attached");
1034 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1035 session_viewer_detach(session
);
1037 } else if (session
->live_timer
== 0) {
1038 DBG("Not live session");
1039 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1043 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1044 cds_list_add(&session
->viewer_session_list
,
1045 &conn
->viewer_session
->sessions_head
);
1048 switch (be32toh(request
.seek
)) {
1049 case LTTNG_VIEWER_SEEK_BEGINNING
:
1050 case LTTNG_VIEWER_SEEK_LAST
:
1051 seek_type
= be32toh(request
.seek
);
1054 ERR("Wrong seek parameter");
1055 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1060 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
, NULL
);
1064 response
.streams_count
= htobe32(nb_streams
);
1067 health_code_update();
1068 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1072 health_code_update();
1075 * Unknown or empty session, just return gracefully, the viewer knows what
1078 if (!send_streams
|| !nb_streams
) {
1083 /* Send stream and ignore the sent flag. */
1084 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1096 * Open the index file if needed for the given vstream.
1098 * If an index file is successfully opened, the index_read_fd of the stream is
1101 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1103 static int try_open_index(struct relay_viewer_stream
*vstream
,
1104 struct relay_stream
*rstream
)
1111 if (vstream
->index_read_fd
>= 0) {
1116 * First time, we open the index file and at least one index is ready. The
1117 * race between the read and write of the total_index_received is
1118 * acceptable here since the client will be notified to simply come back
1119 * and get the next index.
1121 if (rstream
->total_index_received
<= 0) {
1125 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1126 vstream
->tracefile_count
, vstream
->tracefile_count_current
);
1128 vstream
->index_read_fd
= ret
;
1138 * Check the status of the index for the given stream. This function updates
1139 * the index structure if needed and can destroy the vstream also for the HUP
1142 * Return 0 means that we can proceed with the index. A value of 1 means that
1143 * the index has been updated and is ready to be send to the client. A negative
1144 * value indicates an error that can't be handled.
1146 static int check_index_status(struct relay_viewer_stream
*vstream
,
1147 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1148 struct lttng_viewer_index
*index
)
1157 if (!rstream
->close_flag
) {
1158 /* Rotate on abort (overwrite). */
1159 if (vstream
->abort_flag
) {
1160 DBG("Viewer stream %" PRIu64
" rotate because of overwrite",
1161 vstream
->stream_handle
);
1162 ret
= viewer_stream_rotate(vstream
, rstream
);
1165 } else if (ret
== 1) {
1167 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1170 /* ret == 0 means successful so we continue. */
1173 /* Check if we are in the same trace file at this point. */
1174 if (rstream
->tracefile_count_current
== vstream
->tracefile_count_current
) {
1175 if (rstream
->beacon_ts_end
!= -1ULL &&
1176 vstream
->last_sent_index
== rstream
->total_index_received
) {
1178 * We've received a synchronization beacon and the last index
1179 * available has been sent, the index for now is inactive.
1181 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1182 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1183 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1185 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
1186 && !vstream
->close_write_flag
) {
1188 * Reader and writer are working in the same tracefile, so we care
1189 * about the number of index received and sent. Otherwise, we read
1192 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1196 /* Nothing to do with the index, continue with it. */
1198 } else if (rstream
->close_flag
&& vstream
->close_write_flag
&&
1199 vstream
->total_index_received
== vstream
->last_sent_index
) {
1200 /* Last index sent and current tracefile closed in write */
1201 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1204 vstream
->close_write_flag
= 1;
1212 viewer_stream_delete(vstream
);
1213 viewer_stream_destroy(trace
, vstream
);
1219 * Send the next index for a stream.
1221 * Return 0 on success or else a negative value.
1224 int viewer_get_next_index(struct relay_connection
*conn
)
1228 struct lttng_viewer_get_next_index request_index
;
1229 struct lttng_viewer_index viewer_index
;
1230 struct ctf_packet_index packet_index
;
1231 struct relay_viewer_stream
*vstream
;
1232 struct relay_stream
*rstream
;
1233 struct ctf_trace
*ctf_trace
;
1234 struct relay_session
*session
;
1238 DBG("Viewer get next index");
1240 health_code_update();
1242 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1246 health_code_update();
1249 vstream
= viewer_stream_find_by_id(be64toh(request_index
.stream_id
));
1255 session
= session_find_by_id(conn
->sessions_ht
, vstream
->session_id
);
1261 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
, vstream
->path_name
);
1264 memset(&viewer_index
, 0, sizeof(viewer_index
));
1267 * The viewer should not ask for index on metadata stream.
1269 if (vstream
->metadata_flag
) {
1270 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1274 rstream
= stream_find_by_id(relay_streams_ht
, vstream
->stream_handle
);
1277 /* Try to open an index if one is needed for that stream. */
1278 ret
= try_open_index(vstream
, rstream
);
1280 if (ret
== -ENOENT
) {
1282 * The index is created only when the first data packet arrives, it
1283 * might not be ready at the beginning of the session
1285 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1287 /* Unhandled error. */
1288 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1293 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1294 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1295 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1298 } else if (ret
== 1) {
1300 * This means the viewer index data structure has been populated by the
1301 * check call thus we now send back the reply to the client.
1305 /* At this point, ret MUST be 0 thus we continue with the get. */
1308 if (!ctf_trace
->metadata_received
||
1309 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1310 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1313 ret
= check_new_streams(conn
);
1316 } else if (ret
== 1) {
1317 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1320 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1321 pthread_mutex_lock(&vstream
->overwrite_lock
);
1322 if (vstream
->abort_flag
) {
1323 /* The file is being overwritten by the writer, we cannot use it. */
1324 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1325 ret
= viewer_stream_rotate(vstream
, rstream
);
1326 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1329 } else if (ret
== 1) {
1330 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1331 viewer_stream_delete(vstream
);
1332 viewer_stream_destroy(ctf_trace
, vstream
);
1334 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1339 read_ret
= lttng_read(vstream
->index_read_fd
, &packet_index
,
1340 sizeof(packet_index
));
1341 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1342 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1344 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1345 viewer_stream_delete(vstream
);
1346 viewer_stream_destroy(ctf_trace
, vstream
);
1348 } else if (read_ret
< sizeof(packet_index
)) {
1349 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1350 if (vstream
->close_write_flag
) {
1351 ret
= viewer_stream_rotate(vstream
, rstream
);
1353 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1355 } else if (ret
== 1) {
1356 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1357 viewer_stream_delete(vstream
);
1358 viewer_stream_destroy(ctf_trace
, vstream
);
1360 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1363 ERR("Relay reading index file %d", vstream
->index_read_fd
);
1364 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1366 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1369 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1370 vstream
->last_sent_index
++;
1374 * Indexes are stored in big endian, no need to switch before sending.
1376 viewer_index
.offset
= packet_index
.offset
;
1377 viewer_index
.packet_size
= packet_index
.packet_size
;
1378 viewer_index
.content_size
= packet_index
.content_size
;
1379 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1380 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1381 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1382 viewer_index
.stream_id
= packet_index
.stream_id
;
1385 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1386 health_code_update();
1388 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1392 health_code_update();
1394 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1395 vstream
->last_sent_index
, vstream
->stream_handle
);
1405 * Send the next index for a stream
1407 * Return 0 on success or else a negative value.
1410 int viewer_get_packet(struct relay_connection
*conn
)
1412 int ret
, send_data
= 0;
1416 struct lttng_viewer_get_packet get_packet_info
;
1417 struct lttng_viewer_trace_packet reply
;
1418 struct relay_viewer_stream
*stream
;
1419 struct relay_session
*session
;
1420 struct ctf_trace
*ctf_trace
;
1424 DBG2("Relay get data packet");
1426 health_code_update();
1428 ret
= recv_request(conn
->sock
, &get_packet_info
, sizeof(get_packet_info
));
1432 health_code_update();
1434 /* From this point on, the error label can be reached. */
1435 memset(&reply
, 0, sizeof(reply
));
1438 stream
= viewer_stream_find_by_id(be64toh(get_packet_info
.stream_id
));
1443 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1449 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1454 * First time we read this stream, we need open the tracefile, we should
1455 * only arrive here if an index has already been sent to the viewer, so the
1456 * tracefile must exist, if it does not it is a fatal error.
1458 if (stream
->read_fd
< 0) {
1459 char fullpath
[PATH_MAX
];
1461 if (stream
->tracefile_count
> 0) {
1462 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
, stream
->path_name
,
1463 stream
->channel_name
,
1464 stream
->tracefile_count_current
);
1466 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1467 stream
->channel_name
);
1472 ret
= open(fullpath
, O_RDONLY
);
1474 PERROR("Relay opening trace file");
1477 stream
->read_fd
= ret
;
1480 if (!ctf_trace
->metadata_received
||
1481 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1482 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1483 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1487 ret
= check_new_streams(conn
);
1490 } else if (ret
== 1) {
1491 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1492 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1496 len
= be32toh(get_packet_info
.len
);
1497 data
= zmalloc(len
);
1499 PERROR("relay data zmalloc");
1503 ret
= lseek(stream
->read_fd
, be64toh(get_packet_info
.offset
), SEEK_SET
);
1506 * If the read fd was closed by the streaming side, the
1507 * abort_flag will be set to 1, otherwise it is an error.
1509 if (stream
->abort_flag
== 0) {
1513 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1516 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1517 if (read_len
< len
) {
1519 * If the read fd was closed by the streaming side, the
1520 * abort_flag will be set to 1, otherwise it is an error.
1522 if (stream
->abort_flag
== 0) {
1523 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1525 be64toh(get_packet_info
.offset
));
1528 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1532 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1533 reply
.len
= htobe32(len
);
1538 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1541 reply
.flags
= htobe32(reply
.flags
);
1543 health_code_update();
1545 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1549 health_code_update();
1552 health_code_update();
1553 ret
= send_response(conn
->sock
, data
, len
);
1557 health_code_update();
1560 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1561 be64toh(get_packet_info
.stream_id
));
1572 * Send the session's metadata
1574 * Return 0 on success else a negative value.
1577 int viewer_get_metadata(struct relay_connection
*conn
)
1583 struct lttng_viewer_get_metadata request
;
1584 struct lttng_viewer_metadata_packet reply
;
1585 struct relay_viewer_stream
*stream
;
1586 struct ctf_trace
*ctf_trace
;
1587 struct relay_session
*session
;
1591 DBG("Relay get metadata");
1593 health_code_update();
1595 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1599 health_code_update();
1601 memset(&reply
, 0, sizeof(reply
));
1604 stream
= viewer_stream_find_by_id(be64toh(request
.stream_id
));
1605 if (!stream
|| !stream
->metadata_flag
) {
1606 ERR("Invalid metadata stream");
1610 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1616 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1619 assert(ctf_trace
->metadata_sent
<= ctf_trace
->metadata_received
);
1621 len
= ctf_trace
->metadata_received
- ctf_trace
->metadata_sent
;
1623 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1627 /* first time, we open the metadata file */
1628 if (stream
->read_fd
< 0) {
1629 char fullpath
[PATH_MAX
];
1631 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1632 stream
->channel_name
);
1636 ret
= open(fullpath
, O_RDONLY
);
1638 PERROR("Relay opening metadata file");
1641 stream
->read_fd
= ret
;
1644 reply
.len
= htobe64(len
);
1645 data
= zmalloc(len
);
1647 PERROR("viewer metadata zmalloc");
1651 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1652 if (read_len
< len
) {
1653 PERROR("Relay reading metadata file");
1656 ctf_trace
->metadata_sent
+= read_len
;
1657 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1661 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1664 health_code_update();
1665 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1669 health_code_update();
1672 ret
= send_response(conn
->sock
, data
, len
);
1678 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1679 be64toh(request
.stream_id
));
1681 DBG("Metadata sent");
1691 * Create a viewer session.
1693 * Return 0 on success or else a negative value.
1696 int viewer_create_session(struct relay_connection
*conn
)
1699 struct lttng_viewer_create_session_response resp
;
1701 DBG("Viewer create session received");
1703 memset(&resp
, 0, sizeof(resp
));
1704 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1705 conn
->viewer_session
= zmalloc(sizeof(*conn
->viewer_session
));
1706 if (!conn
->viewer_session
) {
1707 ERR("Allocation viewer session");
1708 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1711 CDS_INIT_LIST_HEAD(&conn
->viewer_session
->sessions_head
);
1714 health_code_update();
1715 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1719 health_code_update();
1728 * live_relay_unknown_command: send -1 if received unknown command
1731 void live_relay_unknown_command(struct relay_connection
*conn
)
1733 struct lttcomm_relayd_generic_reply reply
;
1735 memset(&reply
, 0, sizeof(reply
));
1736 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1737 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1741 * Process the commands received on the control socket
1744 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1745 struct relay_connection
*conn
)
1753 msg_value
= be32toh(recv_hdr
->cmd
);
1756 * Make sure we've done the version check before any command other then a
1757 * new client connection.
1759 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1760 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1765 switch (msg_value
) {
1766 case LTTNG_VIEWER_CONNECT
:
1767 ret
= viewer_connect(conn
);
1769 case LTTNG_VIEWER_LIST_SESSIONS
:
1770 ret
= viewer_list_sessions(conn
);
1772 case LTTNG_VIEWER_ATTACH_SESSION
:
1773 ret
= viewer_attach_session(conn
);
1775 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1776 ret
= viewer_get_next_index(conn
);
1778 case LTTNG_VIEWER_GET_PACKET
:
1779 ret
= viewer_get_packet(conn
);
1781 case LTTNG_VIEWER_GET_METADATA
:
1782 ret
= viewer_get_metadata(conn
);
1784 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1785 ret
= viewer_get_new_streams(conn
);
1787 case LTTNG_VIEWER_CREATE_SESSION
:
1788 ret
= viewer_create_session(conn
);
1791 ERR("Received unknown viewer command (%u)", be32toh(recv_hdr
->cmd
));
1792 live_relay_unknown_command(conn
);
1802 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1808 (void) lttng_poll_del(events
, pollfd
);
1810 ret
= close(pollfd
);
1812 ERR("Closing pollfd %d", pollfd
);
1817 * Delete and destroy a connection.
1819 * RCU read side lock MUST be acquired.
1821 static void destroy_connection(struct lttng_ht
*relay_connections_ht
,
1822 struct relay_connection
*conn
)
1824 struct relay_session
*session
, *tmp_session
;
1826 assert(relay_connections_ht
);
1829 connection_delete(relay_connections_ht
, conn
);
1831 if (!conn
->viewer_session
) {
1836 cds_list_for_each_entry_safe(session
, tmp_session
,
1837 &conn
->viewer_session
->sessions_head
,
1838 viewer_session_list
) {
1839 DBG("Cleaning connection of session ID %" PRIu64
, session
->id
);
1840 cleanup_session(conn
, session
);
1845 connection_destroy(conn
);
1849 * This thread does the actual work
1852 void *thread_worker(void *data
)
1856 struct relay_connection
*conn
;
1857 struct lttng_poll_event events
;
1858 struct lttng_ht
*relay_connections_ht
;
1859 struct lttng_ht_iter iter
;
1860 struct lttng_viewer_cmd recv_hdr
;
1861 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
1862 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
1864 DBG("[thread] Live viewer relay worker started");
1866 rcu_register_thread();
1868 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1870 if (testpoint(relayd_thread_live_worker
)) {
1871 goto error_testpoint
;
1874 /* table of connections indexed on socket */
1875 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1876 if (!relay_connections_ht
) {
1877 goto relay_connections_ht_error
;
1880 ret
= create_thread_poll_set(&events
, 2);
1882 goto error_poll_create
;
1885 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1894 health_code_update();
1896 /* Infinite blocking call, waiting for transmission */
1897 DBG3("Relayd live viewer worker thread polling...");
1898 health_poll_entry();
1899 ret
= lttng_poll_wait(&events
, -1);
1903 * Restart interrupted system call.
1905 if (errno
== EINTR
) {
1914 * Process control. The control connection is prioritised so we don't
1915 * starve it with high throughput tracing data on the data
1918 for (i
= 0; i
< nb_fd
; i
++) {
1919 /* Fetch once the poll data */
1920 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1921 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1923 health_code_update();
1925 /* Thread quit pipe has been closed. Killing thread. */
1926 ret
= check_thread_quit_pipe(pollfd
, revents
);
1932 /* Inspect the relay conn pipe for new connection */
1933 if (pollfd
== live_conn_pipe
[0]) {
1934 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1935 ERR("Relay live pipe error");
1937 } else if (revents
& LPOLLIN
) {
1938 ret
= lttng_read(live_conn_pipe
[0], &conn
, sizeof(conn
));
1942 conn
->sessions_ht
= sessions_ht
;
1943 connection_init(conn
);
1944 lttng_poll_add(&events
, conn
->sock
->fd
,
1945 LPOLLIN
| LPOLLRDHUP
);
1947 lttng_ht_add_unique_ulong(relay_connections_ht
,
1950 DBG("Connection socket %d added", conn
->sock
->fd
);
1954 conn
= connection_find_by_sock(relay_connections_ht
, pollfd
);
1955 /* If not found, there is a synchronization issue. */
1958 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1959 cleanup_connection_pollfd(&events
, pollfd
);
1960 destroy_connection(relay_connections_ht
, conn
);
1961 } else if (revents
& LPOLLIN
) {
1962 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1963 sizeof(recv_hdr
), 0);
1965 /* Connection closed */
1966 cleanup_connection_pollfd(&events
, pollfd
);
1967 destroy_connection(relay_connections_ht
, conn
);
1968 DBG("Viewer control conn closed with %d", pollfd
);
1970 ret
= process_control(&recv_hdr
, conn
);
1972 /* Clear the session on error. */
1973 cleanup_connection_pollfd(&events
, pollfd
);
1974 destroy_connection(relay_connections_ht
, conn
);
1975 DBG("Viewer connection closed with %d", pollfd
);
1986 lttng_poll_clean(&events
);
1988 /* Cleanup reamaining connection object. */
1990 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, conn
,
1992 health_code_update();
1993 destroy_connection(relay_connections_ht
, conn
);
1997 lttng_ht_destroy(relay_connections_ht
);
1998 relay_connections_ht_error
:
1999 /* Close relay conn pipes */
2000 utils_close_pipe(live_conn_pipe
);
2002 DBG("Viewer worker thread exited with error");
2004 DBG("Viewer worker thread cleanup complete");
2008 ERR("Health error occurred in %s", __func__
);
2010 health_unregister(health_relayd
);
2011 if (lttng_relay_stop_threads()) {
2012 ERR("Error stopping threads");
2014 rcu_unregister_thread();
2019 * Create the relay command pipe to wake thread_manage_apps.
2020 * Closed in cleanup().
2022 static int create_conn_pipe(void)
2024 return utils_create_pipe_cloexec(live_conn_pipe
);
2027 int relayd_live_join(void)
2029 int ret
, retval
= 0;
2032 ret
= pthread_join(live_listener_thread
, &status
);
2035 PERROR("pthread_join live listener");
2039 ret
= pthread_join(live_worker_thread
, &status
);
2042 PERROR("pthread_join live worker");
2046 ret
= pthread_join(live_dispatcher_thread
, &status
);
2049 PERROR("pthread_join live dispatcher");
2053 cleanup_relayd_live();
2061 int relayd_live_create(struct lttng_uri
*uri
,
2062 struct relay_local_data
*relay_ctx
)
2064 int ret
= 0, retval
= 0;
2070 goto exit_init_data
;
2074 /* Check if daemon is UID = 0 */
2075 is_root
= !getuid();
2078 if (live_uri
->port
< 1024) {
2079 ERR("Need to be root to use ports < 1024");
2081 goto exit_init_data
;
2085 /* Setup the thread apps communication pipe. */
2086 if (create_conn_pipe()) {
2088 goto exit_init_data
;
2091 /* Init relay command queue. */
2092 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2094 /* Set up max poll set size */
2095 lttng_poll_set_max_size();
2097 /* Setup the dispatcher thread */
2098 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2099 thread_dispatcher
, (void *) NULL
);
2102 PERROR("pthread_create viewer dispatcher");
2104 goto exit_dispatcher_thread
;
2107 /* Setup the worker thread */
2108 ret
= pthread_create(&live_worker_thread
, NULL
,
2109 thread_worker
, relay_ctx
);
2112 PERROR("pthread_create viewer worker");
2114 goto exit_worker_thread
;
2117 /* Setup the listener thread */
2118 ret
= pthread_create(&live_listener_thread
, NULL
,
2119 thread_listener
, (void *) NULL
);
2122 PERROR("pthread_create viewer listener");
2124 goto exit_listener_thread
;
2128 * All OK, started all threads.
2133 ret
= pthread_join(live_listener_thread
, &status
);
2136 PERROR("pthread_join live listener");
2139 exit_listener_thread
:
2141 ret
= pthread_join(live_worker_thread
, &status
);
2144 PERROR("pthread_join live worker");
2149 ret
= pthread_join(live_dispatcher_thread
, &status
);
2152 PERROR("pthread_join live dispatcher");
2155 exit_dispatcher_thread
:
2158 cleanup_relayd_live();