2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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>
39 #include <urcu/rculist.h>
44 #include <lttng/lttng.h>
45 #include <common/common.h>
46 #include <common/compat/poll.h>
47 #include <common/compat/socket.h>
48 #include <common/compat/endian.h>
49 #include <common/defaults.h>
50 #include <common/futex.h>
51 #include <common/index/index.h>
52 #include <common/sessiond-comm/sessiond-comm.h>
53 #include <common/sessiond-comm/inet.h>
54 #include <common/sessiond-comm/relayd.h>
55 #include <common/uri.h>
56 #include <common/utils.h>
60 #include "lttng-relayd.h"
62 #include "health-relayd.h"
63 #include "testpoint.h"
64 #include "viewer-stream.h"
67 #include "ctf-trace.h"
68 #include "connection.h"
69 #include "viewer-session.h"
71 #define SESSION_BUF_DEFAULT_COUNT 16
73 static struct lttng_uri
*live_uri
;
76 * This pipe is used to inform the worker thread that a command is queued and
77 * ready to be processed.
79 static int live_conn_pipe
[2] = { -1, -1 };
81 /* Shared between threads */
82 static int live_dispatch_thread_exit
;
84 static pthread_t live_listener_thread
;
85 static pthread_t live_dispatcher_thread
;
86 static pthread_t live_worker_thread
;
89 * Relay command queue.
91 * The live_thread_listener and live_thread_dispatcher communicate with this
94 static struct relay_conn_queue viewer_conn_queue
;
96 static uint64_t last_relay_viewer_session_id
;
97 static pthread_mutex_t last_relay_viewer_session_id_lock
=
98 PTHREAD_MUTEX_INITIALIZER
;
104 void cleanup_relayd_live(void)
112 * Receive a request buffer using a given socket, destination allocated buffer
115 * Return the size of the received message or else a negative value on error
116 * with errno being set by recvmsg() syscall.
119 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
123 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
124 if (ret
< 0 || ret
!= size
) {
126 /* Orderly shutdown. Not necessary to print an error. */
127 DBG("Socket %d did an orderly shutdown", sock
->fd
);
129 ERR("Relay failed to receive request.");
138 * Send a response buffer using a given socket, source allocated buffer of
141 * Return the size of the sent message or else a negative value on error with
142 * errno being set by sendmsg() syscall.
145 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
) {
175 cds_list_for_each_entry_rcu(session
,
176 &conn
->viewer_session
->session_list
,
177 viewer_session_node
) {
178 if (!session_get(session
)) {
181 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
183 session_put(session
);
194 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
195 * this function should ignore the sent flag or not.
197 * Return 0 on success or else a negative value.
200 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
201 struct relay_session
*session
, unsigned int ignore_sent_flag
)
204 struct lttng_viewer_stream send_stream
;
205 struct lttng_ht_iter iter
;
206 struct relay_viewer_stream
*vstream
;
210 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
212 struct ctf_trace
*ctf_trace
;
214 health_code_update();
216 if (!viewer_stream_get(vstream
)) {
220 pthread_mutex_lock(&vstream
->stream
->lock
);
221 /* Ignore if not the same session. */
222 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
223 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
224 pthread_mutex_unlock(&vstream
->stream
->lock
);
225 viewer_stream_put(vstream
);
229 ctf_trace
= vstream
->stream
->trace
;
230 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
231 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
232 send_stream
.metadata_flag
= htobe32(
233 vstream
->stream
->is_metadata
);
234 strncpy(send_stream
.path_name
, vstream
->path_name
,
235 sizeof(send_stream
.path_name
));
236 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
237 sizeof(send_stream
.channel_name
));
239 DBG("Sending stream %" PRIu64
" to viewer",
240 vstream
->stream
->stream_handle
);
241 vstream
->sent_flag
= 1;
242 pthread_mutex_unlock(&vstream
->stream
->lock
);
244 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
245 viewer_stream_put(vstream
);
259 * Create every viewer stream possible for the given session with the seek
260 * type. Three counters *can* be return which are in order the total amount of
261 * viewer stream of the session, the number of unsent stream and the number of
262 * stream created. Those counters can be NULL and thus will be ignored.
264 * Return 0 on success or else a negative value.
267 int make_viewer_streams(struct relay_session
*session
,
268 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
269 uint32_t *nb_created
, bool *closed
)
272 struct lttng_ht_iter iter
;
273 struct ctf_trace
*ctf_trace
;
278 * Hold the session lock to ensure that we see either none or
279 * all initial streams for a session, but no intermediate state.
281 pthread_mutex_lock(&session
->lock
);
283 if (session
->connection_closed
) {
288 * Create viewer streams for relay streams that are ready to be
289 * used for a the given session id only.
292 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
294 struct relay_stream
*stream
;
296 health_code_update();
298 if (!ctf_trace_get(ctf_trace
)) {
302 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
303 struct relay_viewer_stream
*vstream
;
305 if (!stream_get(stream
)) {
309 * stream published is protected by the session
312 if (!stream
->published
) {
315 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
317 vstream
= viewer_stream_create(stream
, seek_t
);
320 ctf_trace_put(ctf_trace
);
326 /* Update number of created stream counter. */
330 if (!vstream
->sent_flag
&& nb_unsent
) {
331 /* Update number of unsent stream counter. */
334 viewer_stream_put(vstream
);
336 /* Update number of total stream counter. */
343 ctf_trace_put(ctf_trace
);
350 pthread_mutex_unlock(&session
->lock
);
354 int relayd_live_stop(void)
356 /* Stop dispatch thread */
357 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
358 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
, thread_quit_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_thread_quit_pipe(int fd
, uint32_t events
)
400 if (fd
== thread_quit_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
);
517 /* No activity for this FD (poll implementation). */
521 /* Thread quit pipe has been closed. Killing thread. */
522 ret
= check_thread_quit_pipe(pollfd
, revents
);
528 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
529 ERR("socket poll error");
531 } else if (revents
& LPOLLIN
) {
533 * A new connection is requested, therefore a
534 * viewer connection is allocated in this
535 * thread, enqueued to a global queue and
536 * dequeued (and freed) in the worker thread.
539 struct relay_connection
*new_conn
;
540 struct lttcomm_sock
*newsock
;
542 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
544 PERROR("accepting control sock");
547 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
549 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
552 PERROR("setsockopt inet");
553 lttcomm_destroy_sock(newsock
);
556 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
558 lttcomm_destroy_sock(newsock
);
561 /* Ownership assumed by the connection. */
564 /* Enqueue request for the dispatcher thread. */
565 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
569 * Wake the dispatch queue futex.
570 * Implicit memory barrier with the
571 * exchange in cds_wfcq_enqueue.
573 futex_nto1_wake(&viewer_conn_queue
.futex
);
582 lttng_poll_clean(&events
);
584 if (live_control_sock
->fd
>= 0) {
585 ret
= live_control_sock
->ops
->close(live_control_sock
);
590 lttcomm_destroy_sock(live_control_sock
);
594 DBG("Live viewer listener thread exited with error");
596 health_unregister(health_relayd
);
597 DBG("Live viewer listener thread cleanup complete");
598 if (lttng_relay_stop_threads()) {
599 ERR("Error stopping threads");
605 * This thread manages the dispatching of the requests to worker threads
608 void *thread_dispatcher(void *data
)
612 struct cds_wfcq_node
*node
;
613 struct relay_connection
*conn
= NULL
;
615 DBG("[thread] Live viewer relay dispatcher started");
617 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
619 if (testpoint(relayd_thread_live_dispatcher
)) {
620 goto error_testpoint
;
623 health_code_update();
625 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
626 health_code_update();
628 /* Atomically prepare the queue futex */
629 futex_nto1_prepare(&viewer_conn_queue
.futex
);
632 health_code_update();
634 /* Dequeue commands */
635 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
636 &viewer_conn_queue
.tail
);
638 DBG("Woken up but nothing in the live-viewer "
639 "relay command queue");
640 /* Continue thread execution */
643 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
644 DBG("Dispatching viewer request waiting on sock %d",
648 * Inform worker thread of the new request. This
649 * call is blocking so we can be assured that
650 * the data will be read at some point in time
651 * or wait to the end of the world :)
653 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
655 PERROR("write conn pipe");
656 connection_put(conn
);
659 } while (node
!= NULL
);
661 /* Futex wait on queue. Blocking call on futex() */
663 futex_nto1_wait(&viewer_conn_queue
.futex
);
667 /* Normal exit, no error */
674 ERR("Health error occurred in %s", __func__
);
676 health_unregister(health_relayd
);
677 DBG("Live viewer dispatch thread dying");
678 if (lttng_relay_stop_threads()) {
679 ERR("Error stopping threads");
685 * Establish connection with the viewer and check the versions.
687 * Return 0 on success or else negative value.
690 int viewer_connect(struct relay_connection
*conn
)
693 struct lttng_viewer_connect reply
, msg
;
695 conn
->version_check_done
= 1;
697 health_code_update();
699 DBG("Viewer is establishing a connection to the relayd.");
701 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
706 health_code_update();
708 memset(&reply
, 0, sizeof(reply
));
709 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
710 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
712 /* Major versions must be the same */
713 if (reply
.major
!= be32toh(msg
.major
)) {
714 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
715 reply
.major
, be32toh(msg
.major
));
720 conn
->major
= reply
.major
;
721 /* We adapt to the lowest compatible version */
722 if (reply
.minor
<= be32toh(msg
.minor
)) {
723 conn
->minor
= reply
.minor
;
725 conn
->minor
= be32toh(msg
.minor
);
728 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
729 conn
->type
= RELAY_VIEWER_COMMAND
;
730 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
731 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
733 ERR("Unknown connection type : %u", be32toh(msg
.type
));
738 reply
.major
= htobe32(reply
.major
);
739 reply
.minor
= htobe32(reply
.minor
);
740 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
742 * Increment outside of htobe64 macro, because the argument can
743 * be used more than once within the macro, and thus the
744 * operation may be undefined.
746 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
747 last_relay_viewer_session_id
++;
748 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
749 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
752 health_code_update();
754 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
759 health_code_update();
761 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
769 * Send the viewer the list of current sessions.
770 * We need to create a copy of the hash table content because otherwise
771 * we cannot assume the number of entries stays the same between getting
772 * the number of HT elements and iteration over the HT.
774 * Return 0 on success or else a negative value.
777 int viewer_list_sessions(struct relay_connection
*conn
)
780 struct lttng_viewer_list_sessions session_list
;
781 struct lttng_ht_iter iter
;
782 struct relay_session
*session
;
783 struct lttng_viewer_session
*send_session_buf
= NULL
;
784 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
787 DBG("List sessions received");
789 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
790 if (!send_session_buf
) {
795 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
797 struct lttng_viewer_session
*send_session
;
799 health_code_update();
801 if (count
>= buf_count
) {
802 struct lttng_viewer_session
*newbuf
;
803 uint32_t new_buf_count
= buf_count
<< 1;
805 newbuf
= realloc(send_session_buf
,
806 new_buf_count
* sizeof(*send_session_buf
));
812 send_session_buf
= newbuf
;
813 buf_count
= new_buf_count
;
815 send_session
= &send_session_buf
[count
];
816 strncpy(send_session
->session_name
, session
->session_name
,
817 sizeof(send_session
->session_name
));
818 strncpy(send_session
->hostname
, session
->hostname
,
819 sizeof(send_session
->hostname
));
820 send_session
->id
= htobe64(session
->id
);
821 send_session
->live_timer
= htobe32(session
->live_timer
);
822 if (session
->viewer_attached
) {
823 send_session
->clients
= htobe32(1);
825 send_session
->clients
= htobe32(0);
827 send_session
->streams
= htobe32(session
->stream_count
);
832 session_list
.sessions_count
= htobe32(count
);
834 health_code_update();
836 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
841 health_code_update();
843 ret
= send_response(conn
->sock
, send_session_buf
,
844 count
* sizeof(*send_session_buf
));
848 health_code_update();
852 free(send_session_buf
);
857 * Send the viewer the list of current streams.
860 int viewer_get_new_streams(struct relay_connection
*conn
)
862 int ret
, send_streams
= 0;
863 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
864 struct lttng_viewer_new_streams_request request
;
865 struct lttng_viewer_new_streams_response response
;
866 struct relay_session
*session
;
872 DBG("Get new streams received");
874 health_code_update();
876 /* Receive the request from the connected client. */
877 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
881 session_id
= be64toh(request
.session_id
);
883 health_code_update();
885 memset(&response
, 0, sizeof(response
));
887 session
= session_get_by_id(session_id
);
889 DBG("Relay session %" PRIu64
" not found", session_id
);
890 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
894 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
896 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
901 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
903 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
904 &nb_created
, &closed
);
906 goto end_put_session
;
908 /* Only send back the newly created streams with the unsent ones. */
909 nb_streams
= nb_created
+ nb_unsent
;
910 response
.streams_count
= htobe32(nb_streams
);
913 * If the session is closed, HUP when there are no more streams.
915 if (closed
&& nb_total
== 0) {
917 response
.streams_count
= 0;
918 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
923 health_code_update();
924 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
926 goto end_put_session
;
928 health_code_update();
931 * Unknown or empty session, just return gracefully, the viewer
932 * knows what is happening.
934 if (!send_streams
|| !nb_streams
) {
936 goto end_put_session
;
940 * Send stream and *DON'T* ignore the sent flag so every viewer
941 * streams that were not sent from that point will be sent to
944 ret
= send_viewer_streams(conn
->sock
, session
, 0);
946 goto end_put_session
;
951 session_put(session
);
958 * Send the viewer the list of current sessions.
961 int viewer_attach_session(struct relay_connection
*conn
)
963 int send_streams
= 0;
965 uint32_t nb_streams
= 0;
966 enum lttng_viewer_seek seek_type
;
967 struct lttng_viewer_attach_session_request request
;
968 struct lttng_viewer_attach_session_response response
;
969 struct relay_session
*session
= NULL
;
974 health_code_update();
976 /* Receive the request from the connected client. */
977 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
982 health_code_update();
984 memset(&response
, 0, sizeof(response
));
986 if (!conn
->viewer_session
) {
987 DBG("Client trying to attach before creating a live viewer session");
988 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
992 session
= session_get_by_id(be64toh(request
.session_id
));
994 DBG("Relay session %" PRIu64
" not found",
995 be64toh(request
.session_id
));
996 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
999 DBG("Attach session ID %" PRIu64
" received",
1000 be64toh(request
.session_id
));
1002 if (session
->live_timer
== 0) {
1003 DBG("Not live session");
1004 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1009 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1011 DBG("Already a viewer attached");
1012 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1016 switch (be32toh(request
.seek
)) {
1017 case LTTNG_VIEWER_SEEK_BEGINNING
:
1018 case LTTNG_VIEWER_SEEK_LAST
:
1019 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1020 seek_type
= be32toh(request
.seek
);
1023 ERR("Wrong seek parameter");
1024 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1029 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1032 goto end_put_session
;
1034 response
.streams_count
= htobe32(nb_streams
);
1037 * If the session is closed when the viewer is attaching, it
1038 * means some of the streams may have been concurrently removed,
1039 * so we don't allow the viewer to attach, even if there are
1040 * streams available.
1044 response
.streams_count
= 0;
1045 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1050 health_code_update();
1051 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1053 goto end_put_session
;
1055 health_code_update();
1058 * Unknown or empty session, just return gracefully, the viewer
1059 * knows what is happening.
1061 if (!send_streams
|| !nb_streams
) {
1063 goto end_put_session
;
1066 /* Send stream and ignore the sent flag. */
1067 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1069 goto end_put_session
;
1074 session_put(session
);
1081 * Open the index file if needed for the given vstream.
1083 * If an index file is successfully opened, the vstream index_fd set with
1086 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1088 * Called with rstream lock held.
1090 static int try_open_index(struct relay_viewer_stream
*vstream
,
1091 struct relay_stream
*rstream
)
1095 if (vstream
->index_fd
) {
1100 * First time, we open the index file and at least one index is ready.
1102 if (rstream
->total_index_received
== 0) {
1106 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1107 vstream
->stream
->tracefile_count
,
1108 vstream
->current_tracefile_id
);
1110 vstream
->index_fd
= stream_fd_create(ret
);
1111 if (!vstream
->index_fd
) {
1127 * Check the status of the index for the given stream. This function
1128 * updates the index structure if needed and can put (close) the vstream
1129 * in the HUP situation.
1131 * Return 0 means that we can proceed with the index. A value of 1 means
1132 * that the index has been updated and is ready to be sent to the
1133 * client. A negative value indicates an error that can't be handled.
1135 * Called with rstream lock held.
1137 static int check_index_status(struct relay_viewer_stream
*vstream
,
1138 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1139 struct lttng_viewer_index
*index
)
1143 if (trace
->session
->connection_closed
1144 && rstream
->total_index_received
1145 == vstream
->last_sent_index
) {
1146 /* Last index sent and session connection is closed. */
1147 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1149 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1150 rstream
->total_index_received
1151 == vstream
->last_sent_index
) {
1153 * We've received a synchronization beacon and the last index
1154 * available has been sent, the index for now is inactive.
1156 * In this case, we have received a beacon which allows us to
1157 * inform the client of a time interval during which we can
1158 * guarantee that there are no events to read (and never will
1161 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1162 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1163 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1165 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
) {
1167 * This actually checks the case where recv == last_sent.
1168 * In this case, we have not received a beacon. Therefore, we
1169 * can only ask the client to retry later.
1171 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1173 } else if (!viewer_stream_is_tracefile_seq_readable(vstream
,
1174 vstream
->current_tracefile_seq
)) {
1176 * The producer has overwritten our current file. We
1179 DBG("Viewer stream %" PRIu64
" rotation due to overwrite",
1180 vstream
->stream
->stream_handle
);
1181 ret
= viewer_stream_rotate(vstream
);
1184 } else if (ret
== 1) {
1185 /* EOF across entire stream. */
1186 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1189 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1190 vstream
->current_tracefile_seq
));
1191 /* ret == 0 means successful so we continue. */
1198 * Use EOF on current index file to find out when we
1201 read_ret
= lttng_read(vstream
->index_fd
->fd
, tmp
, 1);
1202 if (read_ret
== 1) {
1205 /* There is still data to read. Rewind position. */
1206 seek_ret
= lseek(vstream
->index_fd
->fd
, -1, SEEK_CUR
);
1212 } else if (read_ret
== 0) {
1213 /* EOF. We need to rotate. */
1214 DBG("Viewer stream %" PRIu64
" rotation due to EOF",
1215 vstream
->stream
->stream_handle
);
1216 ret
= viewer_stream_rotate(vstream
);
1219 } else if (ret
== 1) {
1220 /* EOF across entire stream. */
1221 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1224 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1225 vstream
->current_tracefile_seq
));
1226 /* ret == 0 means successful so we continue. */
1229 /* Error reading index. */
1237 viewer_stream_put(vstream
);
1243 * Send the next index for a stream.
1245 * Return 0 on success or else a negative value.
1248 int viewer_get_next_index(struct relay_connection
*conn
)
1252 struct lttng_viewer_get_next_index request_index
;
1253 struct lttng_viewer_index viewer_index
;
1254 struct ctf_packet_index packet_index
;
1255 struct relay_viewer_stream
*vstream
= NULL
;
1256 struct relay_stream
*rstream
= NULL
;
1257 struct ctf_trace
*ctf_trace
= NULL
;
1258 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1262 DBG("Viewer get next index");
1264 memset(&viewer_index
, 0, sizeof(viewer_index
));
1265 health_code_update();
1267 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1271 health_code_update();
1273 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1279 /* Use back. ref. Protected by refcounts. */
1280 rstream
= vstream
->stream
;
1281 ctf_trace
= rstream
->trace
;
1283 /* metadata_viewer_stream may be NULL. */
1284 metadata_viewer_stream
=
1285 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1287 pthread_mutex_lock(&rstream
->lock
);
1290 * The viewer should not ask for index on metadata stream.
1292 if (rstream
->is_metadata
) {
1293 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1297 /* Try to open an index if one is needed for that stream. */
1298 ret
= try_open_index(vstream
, rstream
);
1300 if (ret
== -ENOENT
) {
1302 * The index is created only when the first data
1303 * packet arrives, it might not be ready at the
1304 * beginning of the session
1306 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1308 /* Unhandled error. */
1309 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1314 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1317 } else if (ret
== 1) {
1319 * We have no index to send and check_index_status has populated
1320 * viewer_index's status.
1324 /* At this point, ret is 0 thus we will be able to read the index. */
1328 * vstream->stream_fd may be NULL if it has been closed by
1329 * tracefile rotation, or if we are at the beginning of the
1330 * stream. We open the data stream file here to protect against
1331 * overwrite caused by tracefile rotation (in association with
1332 * unlink performed before overwrite).
1334 if (!vstream
->stream_fd
) {
1335 char fullpath
[PATH_MAX
];
1337 if (vstream
->stream
->tracefile_count
> 0) {
1338 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1340 vstream
->channel_name
,
1341 vstream
->current_tracefile_id
);
1343 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1345 vstream
->channel_name
);
1350 ret
= open(fullpath
, O_RDONLY
);
1352 PERROR("Relay opening trace file");
1355 vstream
->stream_fd
= stream_fd_create(ret
);
1356 if (!vstream
->stream_fd
) {
1364 ret
= check_new_streams(conn
);
1366 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1368 } else if (ret
== 1) {
1369 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1372 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1373 sizeof(packet_index
));
1374 if (read_ret
< sizeof(packet_index
)) {
1375 ERR("Relay reading index file %d returned %zd",
1376 vstream
->index_fd
->fd
, read_ret
);
1377 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1380 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1381 vstream
->last_sent_index
++;
1385 * Indexes are stored in big endian, no need to switch before sending.
1387 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1388 rstream
->stream_handle
,
1389 be64toh(packet_index
.offset
));
1390 viewer_index
.offset
= packet_index
.offset
;
1391 viewer_index
.packet_size
= packet_index
.packet_size
;
1392 viewer_index
.content_size
= packet_index
.content_size
;
1393 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1394 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1395 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1396 viewer_index
.stream_id
= packet_index
.stream_id
;
1399 pthread_mutex_unlock(&rstream
->lock
);
1401 if (metadata_viewer_stream
) {
1402 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1403 DBG("get next index metadata check: recv %" PRIu64
1405 metadata_viewer_stream
->stream
->metadata_received
,
1406 metadata_viewer_stream
->metadata_sent
);
1407 if (!metadata_viewer_stream
->stream
->metadata_received
||
1408 metadata_viewer_stream
->stream
->metadata_received
>
1409 metadata_viewer_stream
->metadata_sent
) {
1410 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1412 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1415 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1416 health_code_update();
1418 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1422 health_code_update();
1424 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1425 vstream
->last_sent_index
,
1426 vstream
->stream
->stream_handle
);
1428 if (metadata_viewer_stream
) {
1429 viewer_stream_put(metadata_viewer_stream
);
1432 viewer_stream_put(vstream
);
1437 pthread_mutex_unlock(&rstream
->lock
);
1438 if (metadata_viewer_stream
) {
1439 viewer_stream_put(metadata_viewer_stream
);
1441 viewer_stream_put(vstream
);
1446 * Send the next index for a stream
1448 * Return 0 on success or else a negative value.
1451 int viewer_get_packet(struct relay_connection
*conn
)
1453 int ret
, send_data
= 0;
1457 struct lttng_viewer_get_packet get_packet_info
;
1458 struct lttng_viewer_trace_packet reply
;
1459 struct relay_viewer_stream
*vstream
= NULL
;
1460 struct ctf_trace
*ctf_trace
;
1461 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1463 DBG2("Relay get data packet");
1465 health_code_update();
1467 ret
= recv_request(conn
->sock
, &get_packet_info
,
1468 sizeof(get_packet_info
));
1472 health_code_update();
1474 /* From this point on, the error label can be reached. */
1475 memset(&reply
, 0, sizeof(reply
));
1477 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1482 ctf_trace
= vstream
->stream
->trace
;
1484 /* metadata_viewer_stream may be NULL. */
1485 metadata_viewer_stream
=
1486 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1488 if (metadata_viewer_stream
) {
1489 bool get_packet_err
= false;
1491 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1492 DBG("get packet metadata check: recv %" PRIu64
" sent %" PRIu64
,
1493 metadata_viewer_stream
->stream
->metadata_received
,
1494 metadata_viewer_stream
->metadata_sent
);
1495 if (!metadata_viewer_stream
->stream
->metadata_received
||
1496 metadata_viewer_stream
->stream
->metadata_received
>
1497 metadata_viewer_stream
->metadata_sent
) {
1499 * We prevent the client from reading a data stream as
1500 * long as there is metadata left to consume. This
1501 * ensures that the client won't receive data of which
1502 * it can't make sense.
1504 get_packet_err
= true;
1506 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1507 viewer_stream_put(metadata_viewer_stream
);
1508 if (get_packet_err
) {
1509 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1510 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1511 goto send_reply_nolock
;
1515 pthread_mutex_lock(&vstream
->stream
->lock
);
1517 * The vstream->stream_fd used here has been opened by
1518 * get_next_index. It is opened there because this is what
1519 * allows us to grab a reference to the file with stream lock
1520 * held, thus protecting us against overwrite caused by
1521 * tracefile rotation. Since tracefile rotation unlinks the old
1522 * data file, we are ensured that we won't have our data
1523 * overwritten under us.
1525 ret
= check_new_streams(conn
);
1528 } else if (ret
== 1) {
1529 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1530 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1534 len
= be32toh(get_packet_info
.len
);
1535 data
= zmalloc(len
);
1537 PERROR("relay data zmalloc");
1541 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1544 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1545 be64toh(get_packet_info
.offset
));
1548 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1549 if (read_len
< len
) {
1550 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1551 vstream
->stream_fd
->fd
,
1552 be64toh(get_packet_info
.offset
));
1555 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1556 reply
.len
= htobe32(len
);
1561 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1565 pthread_mutex_unlock(&vstream
->stream
->lock
);
1568 reply
.flags
= htobe32(reply
.flags
);
1570 health_code_update();
1572 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1576 health_code_update();
1579 health_code_update();
1580 ret
= send_response(conn
->sock
, data
, len
);
1584 health_code_update();
1587 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1588 be64toh(get_packet_info
.stream_id
));
1594 viewer_stream_put(vstream
);
1600 * Send the session's metadata
1602 * Return 0 on success else a negative value.
1605 int viewer_get_metadata(struct relay_connection
*conn
)
1611 struct lttng_viewer_get_metadata request
;
1612 struct lttng_viewer_metadata_packet reply
;
1613 struct relay_viewer_stream
*vstream
= NULL
;
1617 DBG("Relay get metadata");
1619 health_code_update();
1621 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1625 health_code_update();
1627 memset(&reply
, 0, sizeof(reply
));
1629 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1631 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1634 pthread_mutex_lock(&vstream
->stream
->lock
);
1635 if (!vstream
->stream
->is_metadata
) {
1636 ERR("Invalid metadata stream");
1640 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1642 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1644 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1648 /* first time, we open the metadata file */
1649 if (!vstream
->stream_fd
) {
1650 char fullpath
[PATH_MAX
];
1652 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1653 vstream
->channel_name
);
1657 ret
= open(fullpath
, O_RDONLY
);
1659 PERROR("Relay opening metadata file");
1662 vstream
->stream_fd
= stream_fd_create(ret
);
1663 if (!vstream
->stream_fd
) {
1671 reply
.len
= htobe64(len
);
1672 data
= zmalloc(len
);
1674 PERROR("viewer metadata zmalloc");
1678 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1679 if (read_len
< len
) {
1680 PERROR("Relay reading metadata file");
1683 vstream
->metadata_sent
+= read_len
;
1684 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1685 && vstream
->stream
->closed
) {
1686 /* Release ownership for the viewer metadata stream. */
1687 viewer_stream_put(vstream
);
1690 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1695 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1698 health_code_update();
1700 pthread_mutex_unlock(&vstream
->stream
->lock
);
1702 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1706 health_code_update();
1709 ret
= send_response(conn
->sock
, data
, len
);
1715 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1716 be64toh(request
.stream_id
));
1718 DBG("Metadata sent");
1724 viewer_stream_put(vstream
);
1730 * Create a viewer session.
1732 * Return 0 on success or else a negative value.
1735 int viewer_create_session(struct relay_connection
*conn
)
1738 struct lttng_viewer_create_session_response resp
;
1740 DBG("Viewer create session received");
1742 memset(&resp
, 0, sizeof(resp
));
1743 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1744 conn
->viewer_session
= viewer_session_create();
1745 if (!conn
->viewer_session
) {
1746 ERR("Allocation viewer session");
1747 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1752 health_code_update();
1753 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1757 health_code_update();
1766 * live_relay_unknown_command: send -1 if received unknown command
1769 void live_relay_unknown_command(struct relay_connection
*conn
)
1771 struct lttcomm_relayd_generic_reply reply
;
1773 memset(&reply
, 0, sizeof(reply
));
1774 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1775 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1779 * Process the commands received on the control socket
1782 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1783 struct relay_connection
*conn
)
1788 msg_value
= be32toh(recv_hdr
->cmd
);
1791 * Make sure we've done the version check before any command other then a
1792 * new client connection.
1794 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1795 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1800 switch (msg_value
) {
1801 case LTTNG_VIEWER_CONNECT
:
1802 ret
= viewer_connect(conn
);
1804 case LTTNG_VIEWER_LIST_SESSIONS
:
1805 ret
= viewer_list_sessions(conn
);
1807 case LTTNG_VIEWER_ATTACH_SESSION
:
1808 ret
= viewer_attach_session(conn
);
1810 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1811 ret
= viewer_get_next_index(conn
);
1813 case LTTNG_VIEWER_GET_PACKET
:
1814 ret
= viewer_get_packet(conn
);
1816 case LTTNG_VIEWER_GET_METADATA
:
1817 ret
= viewer_get_metadata(conn
);
1819 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1820 ret
= viewer_get_new_streams(conn
);
1822 case LTTNG_VIEWER_CREATE_SESSION
:
1823 ret
= viewer_create_session(conn
);
1826 ERR("Received unknown viewer command (%u)",
1827 be32toh(recv_hdr
->cmd
));
1828 live_relay_unknown_command(conn
);
1838 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1842 (void) lttng_poll_del(events
, pollfd
);
1844 ret
= close(pollfd
);
1846 ERR("Closing pollfd %d", pollfd
);
1851 * This thread does the actual work
1854 void *thread_worker(void *data
)
1858 struct lttng_poll_event events
;
1859 struct lttng_ht
*viewer_connections_ht
;
1860 struct lttng_ht_iter iter
;
1861 struct lttng_viewer_cmd recv_hdr
;
1862 struct relay_connection
*destroy_conn
;
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 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1876 if (!viewer_connections_ht
) {
1877 goto viewer_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();
1926 /* No activity for this FD (poll implementation). */
1930 /* Thread quit pipe has been closed. Killing thread. */
1931 ret
= check_thread_quit_pipe(pollfd
, revents
);
1937 /* Inspect the relay conn pipe for new connection. */
1938 if (pollfd
== live_conn_pipe
[0]) {
1939 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1940 ERR("Relay live pipe error");
1942 } else if (revents
& LPOLLIN
) {
1943 struct relay_connection
*conn
;
1945 ret
= lttng_read(live_conn_pipe
[0],
1946 &conn
, sizeof(conn
));
1950 lttng_poll_add(&events
, conn
->sock
->fd
,
1951 LPOLLIN
| LPOLLRDHUP
);
1952 connection_ht_add(viewer_connections_ht
, conn
);
1953 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1956 /* Connection activity. */
1957 struct relay_connection
*conn
;
1959 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1964 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1965 cleanup_connection_pollfd(&events
, pollfd
);
1966 /* Put "create" ownership reference. */
1967 connection_put(conn
);
1968 } else if (revents
& LPOLLIN
) {
1969 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1970 sizeof(recv_hdr
), 0);
1972 /* Connection closed. */
1973 cleanup_connection_pollfd(&events
, pollfd
);
1974 /* Put "create" ownership reference. */
1975 connection_put(conn
);
1976 DBG("Viewer control conn closed with %d", pollfd
);
1978 ret
= process_control(&recv_hdr
, conn
);
1980 /* Clear the session on error. */
1981 cleanup_connection_pollfd(&events
, pollfd
);
1982 /* Put "create" ownership reference. */
1983 connection_put(conn
);
1984 DBG("Viewer connection closed with %d", pollfd
);
1988 /* Put local "get_by_sock" reference. */
1989 connection_put(conn
);
1996 lttng_poll_clean(&events
);
1998 /* Cleanup reamaining connection object. */
2000 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
2003 health_code_update();
2004 connection_put(destroy_conn
);
2008 lttng_ht_destroy(viewer_connections_ht
);
2009 viewer_connections_ht_error
:
2010 /* Close relay conn pipes */
2011 utils_close_pipe(live_conn_pipe
);
2013 DBG("Viewer worker thread exited with error");
2015 DBG("Viewer worker thread cleanup complete");
2019 ERR("Health error occurred in %s", __func__
);
2021 health_unregister(health_relayd
);
2022 if (lttng_relay_stop_threads()) {
2023 ERR("Error stopping threads");
2025 rcu_unregister_thread();
2030 * Create the relay command pipe to wake thread_manage_apps.
2031 * Closed in cleanup().
2033 static int create_conn_pipe(void)
2035 return utils_create_pipe_cloexec(live_conn_pipe
);
2038 int relayd_live_join(void)
2040 int ret
, retval
= 0;
2043 ret
= pthread_join(live_listener_thread
, &status
);
2046 PERROR("pthread_join live listener");
2050 ret
= pthread_join(live_worker_thread
, &status
);
2053 PERROR("pthread_join live worker");
2057 ret
= pthread_join(live_dispatcher_thread
, &status
);
2060 PERROR("pthread_join live dispatcher");
2064 cleanup_relayd_live();
2072 int relayd_live_create(struct lttng_uri
*uri
)
2074 int ret
= 0, retval
= 0;
2080 goto exit_init_data
;
2084 /* Check if daemon is UID = 0 */
2085 is_root
= !getuid();
2088 if (live_uri
->port
< 1024) {
2089 ERR("Need to be root to use ports < 1024");
2091 goto exit_init_data
;
2095 /* Setup the thread apps communication pipe. */
2096 if (create_conn_pipe()) {
2098 goto exit_init_data
;
2101 /* Init relay command queue. */
2102 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2104 /* Set up max poll set size */
2105 lttng_poll_set_max_size();
2107 /* Setup the dispatcher thread */
2108 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2109 thread_dispatcher
, (void *) NULL
);
2112 PERROR("pthread_create viewer dispatcher");
2114 goto exit_dispatcher_thread
;
2117 /* Setup the worker thread */
2118 ret
= pthread_create(&live_worker_thread
, NULL
,
2119 thread_worker
, NULL
);
2122 PERROR("pthread_create viewer worker");
2124 goto exit_worker_thread
;
2127 /* Setup the listener thread */
2128 ret
= pthread_create(&live_listener_thread
, NULL
,
2129 thread_listener
, (void *) NULL
);
2132 PERROR("pthread_create viewer listener");
2134 goto exit_listener_thread
;
2138 * All OK, started all threads.
2143 * Join on the live_listener_thread should anything be added after
2144 * the live_listener thread's creation.
2147 exit_listener_thread
:
2149 ret
= pthread_join(live_worker_thread
, &status
);
2152 PERROR("pthread_join live worker");
2157 ret
= pthread_join(live_dispatcher_thread
, &status
);
2160 PERROR("pthread_join live dispatcher");
2163 exit_dispatcher_thread
:
2166 cleanup_relayd_live();