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
);
492 /* No activity for this FD (poll implementation). */
496 /* Thread quit pipe has been closed. Killing thread. */
497 ret
= check_thread_quit_pipe(pollfd
, revents
);
503 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
504 ERR("socket poll error");
506 } else if (revents
& LPOLLIN
) {
508 * Get allocated in this thread, enqueued to a global queue,
509 * dequeued and freed in the worker thread.
512 struct relay_connection
*new_conn
;
513 struct lttcomm_sock
*newsock
;
515 new_conn
= connection_create();
520 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
522 PERROR("accepting control sock");
523 connection_free(new_conn
);
526 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
528 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
531 PERROR("setsockopt inet");
532 lttcomm_destroy_sock(newsock
);
533 connection_free(new_conn
);
536 new_conn
->sock
= newsock
;
538 /* Enqueue request for the dispatcher thread. */
539 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
543 * Wake the dispatch queue futex. Implicit memory barrier with
544 * the exchange in cds_wfcq_enqueue.
546 futex_nto1_wake(&viewer_conn_queue
.futex
);
555 lttng_poll_clean(&events
);
557 if (live_control_sock
->fd
>= 0) {
558 ret
= live_control_sock
->ops
->close(live_control_sock
);
563 lttcomm_destroy_sock(live_control_sock
);
567 DBG("Live viewer listener thread exited with error");
569 health_unregister(health_relayd
);
570 DBG("Live viewer listener thread cleanup complete");
571 if (lttng_relay_stop_threads()) {
572 ERR("Error stopping threads");
578 * This thread manages the dispatching of the requests to worker threads
581 void *thread_dispatcher(void *data
)
585 struct cds_wfcq_node
*node
;
586 struct relay_connection
*conn
= NULL
;
588 DBG("[thread] Live viewer relay dispatcher started");
590 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
592 if (testpoint(relayd_thread_live_dispatcher
)) {
593 goto error_testpoint
;
596 health_code_update();
598 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
599 health_code_update();
601 /* Atomically prepare the queue futex */
602 futex_nto1_prepare(&viewer_conn_queue
.futex
);
605 health_code_update();
607 /* Dequeue commands */
608 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
609 &viewer_conn_queue
.tail
);
611 DBG("Woken up but nothing in the live-viewer "
612 "relay command queue");
613 /* Continue thread execution */
616 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
617 DBG("Dispatching viewer request waiting on sock %d",
621 * Inform worker thread of the new request. This call is blocking
622 * so we can be assured that the data will be read at some point in
623 * time or wait to the end of the world :)
625 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
627 PERROR("write conn pipe");
628 connection_destroy(conn
);
631 } while (node
!= NULL
);
633 /* Futex wait on queue. Blocking call on futex() */
635 futex_nto1_wait(&viewer_conn_queue
.futex
);
639 /* Normal exit, no error */
646 ERR("Health error occurred in %s", __func__
);
648 health_unregister(health_relayd
);
649 DBG("Live viewer dispatch thread dying");
650 if (lttng_relay_stop_threads()) {
651 ERR("Error stopping threads");
657 * Establish connection with the viewer and check the versions.
659 * Return 0 on success or else negative value.
662 int viewer_connect(struct relay_connection
*conn
)
665 struct lttng_viewer_connect reply
, msg
;
669 conn
->version_check_done
= 1;
671 health_code_update();
673 DBG("Viewer is establishing a connection to the relayd.");
675 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
680 health_code_update();
682 memset(&reply
, 0, sizeof(reply
));
683 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
684 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
686 /* Major versions must be the same */
687 if (reply
.major
!= be32toh(msg
.major
)) {
688 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
689 reply
.major
, be32toh(msg
.major
));
694 conn
->major
= reply
.major
;
695 /* We adapt to the lowest compatible version */
696 if (reply
.minor
<= be32toh(msg
.minor
)) {
697 conn
->minor
= reply
.minor
;
699 conn
->minor
= be32toh(msg
.minor
);
702 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
703 conn
->type
= RELAY_VIEWER_COMMAND
;
704 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
705 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
707 ERR("Unknown connection type : %u", be32toh(msg
.type
));
712 reply
.major
= htobe32(reply
.major
);
713 reply
.minor
= htobe32(reply
.minor
);
714 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
716 * Increment outside of htobe64 macro, because can be used more than once
717 * within the macro, and thus the operation may be undefined.
719 last_relay_viewer_session_id
++;
720 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
723 health_code_update();
725 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
730 health_code_update();
732 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
740 * Send the viewer the list of current sessions.
742 * Return 0 on success or else a negative value.
745 int viewer_list_sessions(struct relay_connection
*conn
)
748 struct lttng_viewer_list_sessions session_list
;
750 long approx_before
, approx_after
;
751 struct lttng_ht_iter iter
;
752 struct lttng_viewer_session send_session
;
753 struct relay_session
*session
;
755 DBG("List sessions received");
758 cds_lfht_count_nodes(conn
->sessions_ht
->ht
, &approx_before
, &count
,
760 session_list
.sessions_count
= htobe32(count
);
762 health_code_update();
764 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
769 health_code_update();
771 cds_lfht_for_each_entry(conn
->sessions_ht
->ht
, &iter
.iter
, session
,
773 health_code_update();
775 strncpy(send_session
.session_name
, session
->session_name
,
776 sizeof(send_session
.session_name
));
777 strncpy(send_session
.hostname
, session
->hostname
,
778 sizeof(send_session
.hostname
));
779 send_session
.id
= htobe64(session
->id
);
780 send_session
.live_timer
= htobe32(session
->live_timer
);
781 send_session
.clients
= htobe32(session
->viewer_refcount
);
782 send_session
.streams
= htobe32(session
->stream_count
);
784 health_code_update();
786 ret
= send_response(conn
->sock
, &send_session
, sizeof(send_session
));
791 health_code_update();
800 * Check if a connection is attached to a session.
801 * Return 1 if attached, 0 if not attached, a negative value on error.
804 int session_attached(struct relay_connection
*conn
, uint64_t session_id
)
806 struct relay_session
*session
;
809 if (!conn
->viewer_session
) {
812 cds_list_for_each_entry(session
,
813 &conn
->viewer_session
->sessions_head
,
814 viewer_session_list
) {
815 if (session
->id
== session_id
) {
826 * Delete all streams for a specific session ID.
828 static void destroy_viewer_streams_by_session(struct relay_session
*session
)
830 struct relay_viewer_stream
*stream
;
831 struct lttng_ht_iter iter
;
836 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, stream
,
838 struct ctf_trace
*ctf_trace
;
840 health_code_update();
841 if (stream
->session_id
!= session
->id
) {
845 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
849 viewer_stream_delete(stream
);
851 if (stream
->metadata_flag
) {
852 ctf_trace
->metadata_sent
= 0;
853 ctf_trace
->viewer_metadata_stream
= NULL
;
856 viewer_stream_destroy(ctf_trace
, stream
);
861 static void try_destroy_streams(struct relay_session
*session
)
863 struct ctf_trace
*ctf_trace
;
864 struct lttng_ht_iter iter
;
868 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
870 /* Attempt to destroy the ctf trace of that session. */
871 ctf_trace_try_destroy(session
, ctf_trace
);
878 static void cleanup_session(struct relay_connection
*conn
,
879 struct relay_session
*session
)
882 * Very important that this is done before destroying the session so we
883 * can put back every viewer stream reference from the ctf_trace.
885 destroy_viewer_streams_by_session(session
);
886 try_destroy_streams(session
);
887 cds_list_del(&session
->viewer_session_list
);
888 session_viewer_try_destroy(conn
->sessions_ht
, session
);
892 * Send the viewer the list of current sessions.
895 int viewer_get_new_streams(struct relay_connection
*conn
)
897 int ret
, send_streams
= 0;
898 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0;
899 struct lttng_viewer_new_streams_request request
;
900 struct lttng_viewer_new_streams_response response
;
901 struct relay_session
*session
;
906 DBG("Get new streams received");
908 health_code_update();
910 /* Receive the request from the connected client. */
911 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
915 session_id
= be64toh(request
.session_id
);
917 health_code_update();
919 memset(&response
, 0, sizeof(response
));
922 session
= session_find_by_id(conn
->sessions_ht
, session_id
);
924 DBG("Relay session %" PRIu64
" not found", session_id
);
925 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
929 if (!session_attached(conn
, session_id
)) {
931 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
936 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
938 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, NULL
, &nb_unsent
,
943 /* Only send back the newly created streams with the unsent ones. */
944 nb_streams
= nb_created
+ nb_unsent
;
945 response
.streams_count
= htobe32(nb_streams
);
948 * If the session is closed and we have no new streams to send,
949 * it means that the viewer has already received the whole trace
950 * for this session and should now close it.
952 if (nb_streams
== 0 && session
->close_flag
) {
954 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
956 * Remove the session from the attached list of the connection
957 * and try to destroy it.
959 cds_list_del(&session
->viewer_session_list
);
960 cleanup_session(conn
, session
);
965 health_code_update();
966 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
970 health_code_update();
973 * Unknown or empty session, just return gracefully, the viewer knows what
976 if (!send_streams
|| !nb_streams
) {
982 * Send stream and *DON'T* ignore the sent flag so every viewer streams
983 * that were not sent from that point will be sent to the viewer.
985 ret
= send_viewer_streams(conn
->sock
, session
, 0);
997 * Send the viewer the list of current sessions.
1000 int viewer_attach_session(struct relay_connection
*conn
)
1002 int send_streams
= 0;
1004 uint32_t nb_streams
= 0;
1005 enum lttng_viewer_seek seek_type
;
1006 struct lttng_viewer_attach_session_request request
;
1007 struct lttng_viewer_attach_session_response response
;
1008 struct relay_session
*session
;
1012 health_code_update();
1014 /* Receive the request from the connected client. */
1015 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1020 health_code_update();
1022 memset(&response
, 0, sizeof(response
));
1024 if (!conn
->viewer_session
) {
1025 DBG("Client trying to attach before creating a live viewer session");
1026 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1031 session
= session_find_by_id(conn
->sessions_ht
,
1032 be64toh(request
.session_id
));
1034 DBG("Relay session %" PRIu64
" not found",
1035 be64toh(request
.session_id
));
1036 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1039 session_viewer_attach(session
);
1040 DBG("Attach session ID %" PRIu64
" received", be64toh(request
.session_id
));
1042 if (uatomic_read(&session
->viewer_refcount
) > 1) {
1043 DBG("Already a viewer attached");
1044 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1045 session_viewer_detach(session
);
1047 } else if (session
->live_timer
== 0) {
1048 DBG("Not live session");
1049 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1053 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1054 cds_list_add(&session
->viewer_session_list
,
1055 &conn
->viewer_session
->sessions_head
);
1058 switch (be32toh(request
.seek
)) {
1059 case LTTNG_VIEWER_SEEK_BEGINNING
:
1060 case LTTNG_VIEWER_SEEK_LAST
:
1061 seek_type
= be32toh(request
.seek
);
1064 ERR("Wrong seek parameter");
1065 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1070 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
, NULL
);
1074 response
.streams_count
= htobe32(nb_streams
);
1077 health_code_update();
1078 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1082 health_code_update();
1085 * Unknown or empty session, just return gracefully, the viewer knows what
1088 if (!send_streams
|| !nb_streams
) {
1093 /* Send stream and ignore the sent flag. */
1094 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1106 * Open the index file if needed for the given vstream.
1108 * If an index file is successfully opened, the index_read_fd of the stream is
1111 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1113 static int try_open_index(struct relay_viewer_stream
*vstream
,
1114 struct relay_stream
*rstream
)
1121 if (vstream
->index_read_fd
>= 0) {
1126 * First time, we open the index file and at least one index is ready. The
1127 * race between the read and write of the total_index_received is
1128 * acceptable here since the client will be notified to simply come back
1129 * and get the next index.
1131 if (rstream
->total_index_received
<= 0) {
1135 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1136 vstream
->tracefile_count
, vstream
->tracefile_count_current
);
1138 vstream
->index_read_fd
= ret
;
1148 * Check the status of the index for the given stream. This function updates
1149 * the index structure if needed and can destroy the vstream also for the HUP
1152 * Return 0 means that we can proceed with the index. A value of 1 means that
1153 * the index has been updated and is ready to be send to the client. A negative
1154 * value indicates an error that can't be handled.
1156 static int check_index_status(struct relay_viewer_stream
*vstream
,
1157 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1158 struct lttng_viewer_index
*index
)
1167 if (!rstream
->close_flag
) {
1168 /* Rotate on abort (overwrite). */
1169 if (vstream
->abort_flag
) {
1170 DBG("Viewer stream %" PRIu64
" rotate because of overwrite",
1171 vstream
->stream_handle
);
1172 ret
= viewer_stream_rotate(vstream
, rstream
);
1175 } else if (ret
== 1) {
1177 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1180 /* ret == 0 means successful so we continue. */
1183 /* Check if we are in the same trace file at this point. */
1184 if (rstream
->tracefile_count_current
== vstream
->tracefile_count_current
) {
1185 if (rstream
->beacon_ts_end
!= -1ULL &&
1186 vstream
->last_sent_index
== rstream
->total_index_received
) {
1188 * We've received a synchronization beacon and the last index
1189 * available has been sent, the index for now is inactive.
1191 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1192 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1193 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1195 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
1196 && !vstream
->close_write_flag
) {
1198 * Reader and writer are working in the same tracefile, so we care
1199 * about the number of index received and sent. Otherwise, we read
1202 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1206 /* Nothing to do with the index, continue with it. */
1208 } else if (rstream
->close_flag
&& vstream
->close_write_flag
&&
1209 vstream
->total_index_received
== vstream
->last_sent_index
) {
1210 /* Last index sent and current tracefile closed in write */
1211 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1214 vstream
->close_write_flag
= 1;
1222 viewer_stream_delete(vstream
);
1223 viewer_stream_destroy(trace
, vstream
);
1229 * Send the next index for a stream.
1231 * Return 0 on success or else a negative value.
1234 int viewer_get_next_index(struct relay_connection
*conn
)
1238 struct lttng_viewer_get_next_index request_index
;
1239 struct lttng_viewer_index viewer_index
;
1240 struct ctf_packet_index packet_index
;
1241 struct relay_viewer_stream
*vstream
;
1242 struct relay_stream
*rstream
;
1243 struct ctf_trace
*ctf_trace
;
1244 struct relay_session
*session
;
1248 DBG("Viewer get next index");
1250 health_code_update();
1252 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1256 health_code_update();
1259 vstream
= viewer_stream_find_by_id(be64toh(request_index
.stream_id
));
1265 session
= session_find_by_id(conn
->sessions_ht
, vstream
->session_id
);
1271 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
, vstream
->path_name
);
1274 memset(&viewer_index
, 0, sizeof(viewer_index
));
1277 * The viewer should not ask for index on metadata stream.
1279 if (vstream
->metadata_flag
) {
1280 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1284 rstream
= stream_find_by_id(relay_streams_ht
, vstream
->stream_handle
);
1287 /* Try to open an index if one is needed for that stream. */
1288 ret
= try_open_index(vstream
, rstream
);
1290 if (ret
== -ENOENT
) {
1292 * The index is created only when the first data packet arrives, it
1293 * might not be ready at the beginning of the session
1295 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1297 /* Unhandled error. */
1298 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1303 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1304 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1305 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1308 } else if (ret
== 1) {
1310 * This means the viewer index data structure has been populated by the
1311 * check call thus we now send back the reply to the client.
1315 /* At this point, ret MUST be 0 thus we continue with the get. */
1318 if (!ctf_trace
->metadata_received
||
1319 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1320 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1323 ret
= check_new_streams(conn
);
1326 } else if (ret
== 1) {
1327 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1330 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1331 pthread_mutex_lock(&vstream
->overwrite_lock
);
1332 if (vstream
->abort_flag
) {
1333 /* The file is being overwritten by the writer, we cannot use it. */
1334 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1335 ret
= viewer_stream_rotate(vstream
, rstream
);
1336 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1339 } else if (ret
== 1) {
1340 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1341 viewer_stream_delete(vstream
);
1342 viewer_stream_destroy(ctf_trace
, vstream
);
1344 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1349 read_ret
= lttng_read(vstream
->index_read_fd
, &packet_index
,
1350 sizeof(packet_index
));
1351 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1352 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1354 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1355 viewer_stream_delete(vstream
);
1356 viewer_stream_destroy(ctf_trace
, vstream
);
1358 } else if (read_ret
< sizeof(packet_index
)) {
1359 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1360 if (vstream
->close_write_flag
) {
1361 ret
= viewer_stream_rotate(vstream
, rstream
);
1363 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1365 } else if (ret
== 1) {
1366 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1367 viewer_stream_delete(vstream
);
1368 viewer_stream_destroy(ctf_trace
, vstream
);
1370 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1373 ERR("Relay reading index file %d", vstream
->index_read_fd
);
1374 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1376 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1379 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1380 vstream
->last_sent_index
++;
1384 * Indexes are stored in big endian, no need to switch before sending.
1386 viewer_index
.offset
= packet_index
.offset
;
1387 viewer_index
.packet_size
= packet_index
.packet_size
;
1388 viewer_index
.content_size
= packet_index
.content_size
;
1389 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1390 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1391 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1392 viewer_index
.stream_id
= packet_index
.stream_id
;
1395 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1396 health_code_update();
1398 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1402 health_code_update();
1404 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1405 vstream
->last_sent_index
, vstream
->stream_handle
);
1415 * Send the next index for a stream
1417 * Return 0 on success or else a negative value.
1420 int viewer_get_packet(struct relay_connection
*conn
)
1422 int ret
, send_data
= 0;
1426 struct lttng_viewer_get_packet get_packet_info
;
1427 struct lttng_viewer_trace_packet reply
;
1428 struct relay_viewer_stream
*stream
;
1429 struct relay_session
*session
;
1430 struct ctf_trace
*ctf_trace
;
1434 DBG2("Relay get data packet");
1436 health_code_update();
1438 ret
= recv_request(conn
->sock
, &get_packet_info
, sizeof(get_packet_info
));
1442 health_code_update();
1444 /* From this point on, the error label can be reached. */
1445 memset(&reply
, 0, sizeof(reply
));
1448 stream
= viewer_stream_find_by_id(be64toh(get_packet_info
.stream_id
));
1453 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1459 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1464 * First time we read this stream, we need open the tracefile, we should
1465 * only arrive here if an index has already been sent to the viewer, so the
1466 * tracefile must exist, if it does not it is a fatal error.
1468 if (stream
->read_fd
< 0) {
1469 char fullpath
[PATH_MAX
];
1471 if (stream
->tracefile_count
> 0) {
1472 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
, stream
->path_name
,
1473 stream
->channel_name
,
1474 stream
->tracefile_count_current
);
1476 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1477 stream
->channel_name
);
1482 ret
= open(fullpath
, O_RDONLY
);
1484 PERROR("Relay opening trace file");
1487 stream
->read_fd
= ret
;
1490 if (!ctf_trace
->metadata_received
||
1491 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1492 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1493 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1497 ret
= check_new_streams(conn
);
1500 } else if (ret
== 1) {
1501 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1502 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1506 len
= be32toh(get_packet_info
.len
);
1507 data
= zmalloc(len
);
1509 PERROR("relay data zmalloc");
1513 ret
= lseek(stream
->read_fd
, be64toh(get_packet_info
.offset
), SEEK_SET
);
1516 * If the read fd was closed by the streaming side, the
1517 * abort_flag will be set to 1, otherwise it is an error.
1519 if (stream
->abort_flag
== 0) {
1523 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1526 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1527 if (read_len
< len
) {
1529 * If the read fd was closed by the streaming side, the
1530 * abort_flag will be set to 1, otherwise it is an error.
1532 if (stream
->abort_flag
== 0) {
1533 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1535 be64toh(get_packet_info
.offset
));
1538 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1542 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1543 reply
.len
= htobe32(len
);
1548 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1551 reply
.flags
= htobe32(reply
.flags
);
1553 health_code_update();
1555 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1559 health_code_update();
1562 health_code_update();
1563 ret
= send_response(conn
->sock
, data
, len
);
1567 health_code_update();
1570 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1571 be64toh(get_packet_info
.stream_id
));
1582 * Send the session's metadata
1584 * Return 0 on success else a negative value.
1587 int viewer_get_metadata(struct relay_connection
*conn
)
1593 struct lttng_viewer_get_metadata request
;
1594 struct lttng_viewer_metadata_packet reply
;
1595 struct relay_viewer_stream
*stream
;
1596 struct ctf_trace
*ctf_trace
;
1597 struct relay_session
*session
;
1601 DBG("Relay get metadata");
1603 health_code_update();
1605 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1609 health_code_update();
1611 memset(&reply
, 0, sizeof(reply
));
1614 stream
= viewer_stream_find_by_id(be64toh(request
.stream_id
));
1615 if (!stream
|| !stream
->metadata_flag
) {
1616 ERR("Invalid metadata stream");
1620 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1626 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1629 assert(ctf_trace
->metadata_sent
<= ctf_trace
->metadata_received
);
1631 len
= ctf_trace
->metadata_received
- ctf_trace
->metadata_sent
;
1633 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1637 /* first time, we open the metadata file */
1638 if (stream
->read_fd
< 0) {
1639 char fullpath
[PATH_MAX
];
1641 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1642 stream
->channel_name
);
1646 ret
= open(fullpath
, O_RDONLY
);
1648 PERROR("Relay opening metadata file");
1651 stream
->read_fd
= ret
;
1654 reply
.len
= htobe64(len
);
1655 data
= zmalloc(len
);
1657 PERROR("viewer metadata zmalloc");
1661 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1662 if (read_len
< len
) {
1663 PERROR("Relay reading metadata file");
1666 ctf_trace
->metadata_sent
+= read_len
;
1667 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1671 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1674 health_code_update();
1675 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1679 health_code_update();
1682 ret
= send_response(conn
->sock
, data
, len
);
1688 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1689 be64toh(request
.stream_id
));
1691 DBG("Metadata sent");
1701 * Create a viewer session.
1703 * Return 0 on success or else a negative value.
1706 int viewer_create_session(struct relay_connection
*conn
)
1709 struct lttng_viewer_create_session_response resp
;
1711 DBG("Viewer create session received");
1713 memset(&resp
, 0, sizeof(resp
));
1714 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1715 conn
->viewer_session
= zmalloc(sizeof(*conn
->viewer_session
));
1716 if (!conn
->viewer_session
) {
1717 ERR("Allocation viewer session");
1718 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1721 CDS_INIT_LIST_HEAD(&conn
->viewer_session
->sessions_head
);
1724 health_code_update();
1725 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1729 health_code_update();
1738 * live_relay_unknown_command: send -1 if received unknown command
1741 void live_relay_unknown_command(struct relay_connection
*conn
)
1743 struct lttcomm_relayd_generic_reply reply
;
1745 memset(&reply
, 0, sizeof(reply
));
1746 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1747 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1751 * Process the commands received on the control socket
1754 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1755 struct relay_connection
*conn
)
1763 msg_value
= be32toh(recv_hdr
->cmd
);
1766 * Make sure we've done the version check before any command other then a
1767 * new client connection.
1769 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1770 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1775 switch (msg_value
) {
1776 case LTTNG_VIEWER_CONNECT
:
1777 ret
= viewer_connect(conn
);
1779 case LTTNG_VIEWER_LIST_SESSIONS
:
1780 ret
= viewer_list_sessions(conn
);
1782 case LTTNG_VIEWER_ATTACH_SESSION
:
1783 ret
= viewer_attach_session(conn
);
1785 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1786 ret
= viewer_get_next_index(conn
);
1788 case LTTNG_VIEWER_GET_PACKET
:
1789 ret
= viewer_get_packet(conn
);
1791 case LTTNG_VIEWER_GET_METADATA
:
1792 ret
= viewer_get_metadata(conn
);
1794 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1795 ret
= viewer_get_new_streams(conn
);
1797 case LTTNG_VIEWER_CREATE_SESSION
:
1798 ret
= viewer_create_session(conn
);
1801 ERR("Received unknown viewer command (%u)", be32toh(recv_hdr
->cmd
));
1802 live_relay_unknown_command(conn
);
1812 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1818 (void) lttng_poll_del(events
, pollfd
);
1820 ret
= close(pollfd
);
1822 ERR("Closing pollfd %d", pollfd
);
1827 * Delete and destroy a connection.
1829 * RCU read side lock MUST be acquired.
1831 static void destroy_connection(struct lttng_ht
*relay_connections_ht
,
1832 struct relay_connection
*conn
)
1834 struct relay_session
*session
, *tmp_session
;
1836 assert(relay_connections_ht
);
1839 connection_delete(relay_connections_ht
, conn
);
1841 if (!conn
->viewer_session
) {
1846 cds_list_for_each_entry_safe(session
, tmp_session
,
1847 &conn
->viewer_session
->sessions_head
,
1848 viewer_session_list
) {
1849 DBG("Cleaning connection of session ID %" PRIu64
, session
->id
);
1850 cleanup_session(conn
, session
);
1855 connection_destroy(conn
);
1859 * This thread does the actual work
1862 void *thread_worker(void *data
)
1866 struct lttng_poll_event events
;
1867 struct lttng_ht
*relay_connections_ht
;
1868 struct lttng_ht_iter iter
;
1869 struct lttng_viewer_cmd recv_hdr
;
1870 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
1871 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
1872 struct relay_connection
*destroy_conn
;
1874 DBG("[thread] Live viewer relay worker started");
1876 rcu_register_thread();
1878 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1880 if (testpoint(relayd_thread_live_worker
)) {
1881 goto error_testpoint
;
1884 /* table of connections indexed on socket */
1885 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1886 if (!relay_connections_ht
) {
1887 goto relay_connections_ht_error
;
1890 ret
= create_thread_poll_set(&events
, 2);
1892 goto error_poll_create
;
1895 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1904 health_code_update();
1906 /* Infinite blocking call, waiting for transmission */
1907 DBG3("Relayd live viewer worker thread polling...");
1908 health_poll_entry();
1909 ret
= lttng_poll_wait(&events
, -1);
1913 * Restart interrupted system call.
1915 if (errno
== EINTR
) {
1924 * Process control. The control connection is prioritised so we don't
1925 * starve it with high throughput tracing data on the data
1928 for (i
= 0; i
< nb_fd
; i
++) {
1929 /* Fetch once the poll data */
1930 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1931 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1933 health_code_update();
1936 /* No activity for this FD (poll implementation). */
1940 /* Thread quit pipe has been closed. Killing thread. */
1941 ret
= check_thread_quit_pipe(pollfd
, revents
);
1947 /* Inspect the relay conn pipe for new connection */
1948 if (pollfd
== live_conn_pipe
[0]) {
1949 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1950 ERR("Relay live pipe error");
1952 } else if (revents
& LPOLLIN
) {
1953 struct relay_connection
*conn
;
1955 ret
= lttng_read(live_conn_pipe
[0], &conn
, sizeof(conn
));
1959 conn
->sessions_ht
= sessions_ht
;
1960 connection_init(conn
);
1961 lttng_poll_add(&events
, conn
->sock
->fd
,
1962 LPOLLIN
| LPOLLRDHUP
);
1964 lttng_ht_add_unique_ulong(relay_connections_ht
,
1967 DBG("Connection socket %d added", conn
->sock
->fd
);
1970 struct relay_connection
*conn
;
1973 conn
= connection_find_by_sock(relay_connections_ht
, pollfd
);
1974 /* If not found, there is a synchronization issue. */
1977 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1978 cleanup_connection_pollfd(&events
, pollfd
);
1979 destroy_connection(relay_connections_ht
, conn
);
1980 } else if (revents
& LPOLLIN
) {
1981 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1982 sizeof(recv_hdr
), 0);
1984 /* Connection closed */
1985 cleanup_connection_pollfd(&events
, pollfd
);
1986 destroy_connection(relay_connections_ht
, conn
);
1987 DBG("Viewer control conn closed with %d", pollfd
);
1989 ret
= process_control(&recv_hdr
, conn
);
1991 /* Clear the session on error. */
1992 cleanup_connection_pollfd(&events
, pollfd
);
1993 destroy_connection(relay_connections_ht
, conn
);
1994 DBG("Viewer connection closed with %d", pollfd
);
2005 lttng_poll_clean(&events
);
2007 /* Cleanup reamaining connection object. */
2009 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
,
2012 health_code_update();
2013 destroy_connection(relay_connections_ht
, destroy_conn
);
2017 lttng_ht_destroy(relay_connections_ht
);
2018 relay_connections_ht_error
:
2019 /* Close relay conn pipes */
2020 utils_close_pipe(live_conn_pipe
);
2022 DBG("Viewer worker thread exited with error");
2024 DBG("Viewer worker thread cleanup complete");
2028 ERR("Health error occurred in %s", __func__
);
2030 health_unregister(health_relayd
);
2031 if (lttng_relay_stop_threads()) {
2032 ERR("Error stopping threads");
2034 rcu_unregister_thread();
2039 * Create the relay command pipe to wake thread_manage_apps.
2040 * Closed in cleanup().
2042 static int create_conn_pipe(void)
2044 return utils_create_pipe_cloexec(live_conn_pipe
);
2047 int relayd_live_join(void)
2049 int ret
, retval
= 0;
2052 ret
= pthread_join(live_listener_thread
, &status
);
2055 PERROR("pthread_join live listener");
2059 ret
= pthread_join(live_worker_thread
, &status
);
2062 PERROR("pthread_join live worker");
2066 ret
= pthread_join(live_dispatcher_thread
, &status
);
2069 PERROR("pthread_join live dispatcher");
2073 cleanup_relayd_live();
2081 int relayd_live_create(struct lttng_uri
*uri
,
2082 struct relay_local_data
*relay_ctx
)
2084 int ret
= 0, retval
= 0;
2090 goto exit_init_data
;
2094 /* Check if daemon is UID = 0 */
2095 is_root
= !getuid();
2098 if (live_uri
->port
< 1024) {
2099 ERR("Need to be root to use ports < 1024");
2101 goto exit_init_data
;
2105 /* Setup the thread apps communication pipe. */
2106 if (create_conn_pipe()) {
2108 goto exit_init_data
;
2111 /* Init relay command queue. */
2112 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2114 /* Set up max poll set size */
2115 if (lttng_poll_set_max_size()) {
2117 goto exit_init_data
;
2120 /* Setup the dispatcher thread */
2121 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2122 thread_dispatcher
, (void *) NULL
);
2125 PERROR("pthread_create viewer dispatcher");
2127 goto exit_dispatcher_thread
;
2130 /* Setup the worker thread */
2131 ret
= pthread_create(&live_worker_thread
, NULL
,
2132 thread_worker
, relay_ctx
);
2135 PERROR("pthread_create viewer worker");
2137 goto exit_worker_thread
;
2140 /* Setup the listener thread */
2141 ret
= pthread_create(&live_listener_thread
, NULL
,
2142 thread_listener
, (void *) NULL
);
2145 PERROR("pthread_create viewer listener");
2147 goto exit_listener_thread
;
2151 * All OK, started all threads.
2156 * Join on the live_listener_thread should anything be added after
2157 * the live_listener thread's creation.
2160 exit_listener_thread
:
2162 ret
= pthread_join(live_worker_thread
, &status
);
2165 PERROR("pthread_join live worker");
2170 ret
= pthread_join(live_dispatcher_thread
, &status
);
2173 PERROR("pthread_join live dispatcher");
2176 exit_dispatcher_thread
:
2179 cleanup_relayd_live();