2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
36 #include <urcu/futex.h>
37 #include <urcu/uatomic.h>
42 #include <lttng/lttng.h>
43 #include <common/common.h>
44 #include <common/compat/poll.h>
45 #include <common/compat/socket.h>
46 #include <common/compat/endian.h>
47 #include <common/defaults.h>
48 #include <common/futex.h>
49 #include <common/index/index.h>
50 #include <common/sessiond-comm/sessiond-comm.h>
51 #include <common/sessiond-comm/inet.h>
52 #include <common/sessiond-comm/relayd.h>
53 #include <common/uri.h>
54 #include <common/utils.h>
58 #include "lttng-relayd.h"
60 #include "health-relayd.h"
61 #include "testpoint.h"
62 #include "viewer-stream.h"
65 #include "ctf-trace.h"
66 #include "connection.h"
68 static struct lttng_uri
*live_uri
;
71 * This pipe is used to inform the worker thread that a command is queued and
72 * ready to be processed.
74 static int live_conn_pipe
[2] = { -1, -1 };
76 /* Shared between threads */
77 static int live_dispatch_thread_exit
;
79 static pthread_t live_listener_thread
;
80 static pthread_t live_dispatcher_thread
;
81 static pthread_t live_worker_thread
;
84 * Relay command queue.
86 * The live_thread_listener and live_thread_dispatcher communicate with this
89 static struct relay_conn_queue viewer_conn_queue
;
91 static uint64_t last_relay_viewer_session_id
;
97 void cleanup_relayd_live(void)
105 * Receive a request buffer using a given socket, destination allocated buffer
108 * Return the size of the received message or else a negative value on error
109 * with errno being set by recvmsg() syscall.
112 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
119 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
120 if (ret
< 0 || ret
!= size
) {
122 /* Orderly shutdown. Not necessary to print an error. */
123 DBG("Socket %d did an orderly shutdown", sock
->fd
);
125 ERR("Relay failed to receive request.");
134 * Send a response buffer using a given socket, source allocated buffer of
137 * Return the size of the sent message or else a negative value on error with
138 * errno being set by sendmsg() syscall.
141 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
148 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
150 ERR("Relayd failed to send response.");
157 * Atomically check if new streams got added in one of the sessions attached
158 * and reset the flag to 0.
160 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
164 int check_new_streams(struct relay_connection
*conn
)
166 struct relay_session
*session
;
167 unsigned long current_val
;
170 if (!conn
->viewer_session
) {
173 cds_list_for_each_entry(session
,
174 &conn
->viewer_session
->sessions_head
,
175 viewer_session_list
) {
176 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
188 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
189 * this function should ignore the sent flag or not.
191 * Return 0 on success or else a negative value.
194 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
195 struct relay_session
*session
, unsigned int ignore_sent_flag
)
198 struct lttng_viewer_stream send_stream
;
199 struct lttng_ht_iter iter
;
200 struct relay_viewer_stream
*vstream
;
206 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
208 struct ctf_trace
*ctf_trace
;
210 health_code_update();
212 /* Ignore if not the same session. */
213 if (vstream
->session_id
!= session
->id
||
214 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
218 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
222 send_stream
.id
= htobe64(vstream
->stream_handle
);
223 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
224 send_stream
.metadata_flag
= htobe32(vstream
->metadata_flag
);
225 strncpy(send_stream
.path_name
, vstream
->path_name
,
226 sizeof(send_stream
.path_name
));
227 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
228 sizeof(send_stream
.channel_name
));
230 DBG("Sending stream %" PRIu64
" to viewer", vstream
->stream_handle
);
231 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
235 vstream
->sent_flag
= 1;
246 * Create every viewer stream possible for the given session with the seek
247 * type. Three counters *can* be return which are in order the total amount of
248 * viewer stream of the session, the number of unsent stream and the number of
249 * stream created. Those counters can be NULL and thus will be ignored.
251 * Return 0 on success or else a negative value.
254 int make_viewer_streams(struct relay_session
*session
,
255 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
256 uint32_t *nb_created
)
259 struct lttng_ht_iter iter
;
260 struct ctf_trace
*ctf_trace
;
265 * This is to make sure we create viewer streams for a full received
266 * channel. For instance, if we have 8 streams for a channel that are
267 * concurrently being flagged ready, we can end up creating just a subset
268 * of the 8 streams (the ones that are flagged). This lock avoids this
271 pthread_mutex_lock(&session
->viewer_ready_lock
);
274 * Create viewer streams for relay streams that are ready to be used for a
275 * the given session id only.
278 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
280 struct relay_stream
*stream
;
282 health_code_update();
284 if (ctf_trace
->invalid_flag
) {
288 cds_list_for_each_entry(stream
, &ctf_trace
->stream_list
, trace_list
) {
289 struct relay_viewer_stream
*vstream
;
291 if (!stream
->viewer_ready
) {
295 vstream
= viewer_stream_find_by_id(stream
->stream_handle
);
297 vstream
= viewer_stream_create(stream
, seek_t
, ctf_trace
);
302 /* Acquire reference to ctf_trace. */
303 ctf_trace_get_ref(ctf_trace
);
306 /* Update number of created stream counter. */
309 } else if (!vstream
->sent_flag
&& nb_unsent
) {
310 /* Update number of unsent stream counter. */
313 /* Update number of total stream counter. */
324 pthread_mutex_unlock(&session
->viewer_ready_lock
);
328 int relayd_live_stop(void)
330 /* Stop dispatch thread */
331 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
332 futex_nto1_wake(&viewer_conn_queue
.futex
);
337 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
340 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
344 if (events
== NULL
|| size
== 0) {
349 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
355 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
367 * Check if the thread quit pipe was triggered.
369 * Return 1 if it was triggered else 0;
372 int check_thread_quit_pipe(int fd
, uint32_t events
)
374 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
382 * Create and init socket from uri.
385 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
388 struct lttcomm_sock
*sock
= NULL
;
390 sock
= lttcomm_alloc_sock_from_uri(uri
);
392 ERR("Allocating socket");
396 ret
= lttcomm_create_sock(sock
);
400 DBG("Listening on sock %d for live", sock
->fd
);
402 ret
= sock
->ops
->bind(sock
);
407 ret
= sock
->ops
->listen(sock
, -1);
417 lttcomm_destroy_sock(sock
);
423 * This thread manages the listening for new connections on the network
426 void *thread_listener(void *data
)
428 int i
, ret
, pollfd
, err
= -1;
429 uint32_t revents
, nb_fd
;
430 struct lttng_poll_event events
;
431 struct lttcomm_sock
*live_control_sock
;
433 DBG("[thread] Relay live listener started");
435 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
437 health_code_update();
439 live_control_sock
= init_socket(live_uri
);
440 if (!live_control_sock
) {
441 goto error_sock_control
;
444 /* Pass 2 as size here for the thread quit pipe and control sockets. */
445 ret
= create_thread_poll_set(&events
, 2);
447 goto error_create_poll
;
450 /* Add the control socket */
451 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
456 lttng_relay_notify_ready();
458 if (testpoint(relayd_thread_live_listener
)) {
459 goto error_testpoint
;
463 health_code_update();
465 DBG("Listener accepting live viewers connections");
469 ret
= lttng_poll_wait(&events
, -1);
473 * Restart interrupted system call.
475 if (errno
== EINTR
) {
482 DBG("Relay new viewer connection received");
483 for (i
= 0; i
< nb_fd
; i
++) {
484 health_code_update();
486 /* Fetch once the poll data */
487 revents
= LTTNG_POLL_GETEV(&events
, i
);
488 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
491 /* No activity for this FD (poll implementation). */
495 /* Thread quit pipe has been closed. Killing thread. */
496 ret
= check_thread_quit_pipe(pollfd
, revents
);
502 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
503 ERR("socket poll error");
505 } else if (revents
& LPOLLIN
) {
507 * Get allocated in this thread, enqueued to a global queue,
508 * dequeued and freed in the worker thread.
511 struct relay_connection
*new_conn
;
512 struct lttcomm_sock
*newsock
;
514 new_conn
= connection_create();
519 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
521 PERROR("accepting control sock");
522 connection_free(new_conn
);
525 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
527 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
530 PERROR("setsockopt inet");
531 lttcomm_destroy_sock(newsock
);
532 connection_free(new_conn
);
535 new_conn
->sock
= newsock
;
537 /* Enqueue request for the dispatcher thread. */
538 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
542 * Wake the dispatch queue futex. Implicit memory barrier with
543 * the exchange in cds_wfcq_enqueue.
545 futex_nto1_wake(&viewer_conn_queue
.futex
);
554 lttng_poll_clean(&events
);
556 if (live_control_sock
->fd
>= 0) {
557 ret
= live_control_sock
->ops
->close(live_control_sock
);
562 lttcomm_destroy_sock(live_control_sock
);
566 DBG("Live viewer listener thread exited with error");
568 health_unregister(health_relayd
);
569 DBG("Live viewer listener thread cleanup complete");
570 if (lttng_relay_stop_threads()) {
571 ERR("Error stopping threads");
577 * This thread manages the dispatching of the requests to worker threads
580 void *thread_dispatcher(void *data
)
584 struct cds_wfcq_node
*node
;
585 struct relay_connection
*conn
= NULL
;
587 DBG("[thread] Live viewer relay dispatcher started");
589 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
591 if (testpoint(relayd_thread_live_dispatcher
)) {
592 goto error_testpoint
;
595 health_code_update();
597 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
598 health_code_update();
600 /* Atomically prepare the queue futex */
601 futex_nto1_prepare(&viewer_conn_queue
.futex
);
604 health_code_update();
606 /* Dequeue commands */
607 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
608 &viewer_conn_queue
.tail
);
610 DBG("Woken up but nothing in the live-viewer "
611 "relay command queue");
612 /* Continue thread execution */
615 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
616 DBG("Dispatching viewer request waiting on sock %d",
620 * Inform worker thread of the new request. This call is blocking
621 * so we can be assured that the data will be read at some point in
622 * time or wait to the end of the world :)
624 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
626 PERROR("write conn pipe");
627 connection_destroy(conn
);
630 } while (node
!= NULL
);
632 /* Futex wait on queue. Blocking call on futex() */
634 futex_nto1_wait(&viewer_conn_queue
.futex
);
638 /* Normal exit, no error */
645 ERR("Health error occurred in %s", __func__
);
647 health_unregister(health_relayd
);
648 DBG("Live viewer dispatch thread dying");
649 if (lttng_relay_stop_threads()) {
650 ERR("Error stopping threads");
656 * Establish connection with the viewer and check the versions.
658 * Return 0 on success or else negative value.
661 int viewer_connect(struct relay_connection
*conn
)
664 struct lttng_viewer_connect reply
, msg
;
668 conn
->version_check_done
= 1;
670 health_code_update();
672 DBG("Viewer is establishing a connection to the relayd.");
674 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
679 health_code_update();
681 memset(&reply
, 0, sizeof(reply
));
682 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
683 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
685 /* Major versions must be the same */
686 if (reply
.major
!= be32toh(msg
.major
)) {
687 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
688 reply
.major
, be32toh(msg
.major
));
693 conn
->major
= reply
.major
;
694 /* We adapt to the lowest compatible version */
695 if (reply
.minor
<= be32toh(msg
.minor
)) {
696 conn
->minor
= reply
.minor
;
698 conn
->minor
= be32toh(msg
.minor
);
701 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
702 conn
->type
= RELAY_VIEWER_COMMAND
;
703 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
704 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
706 ERR("Unknown connection type : %u", be32toh(msg
.type
));
711 reply
.major
= htobe32(reply
.major
);
712 reply
.minor
= htobe32(reply
.minor
);
713 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
715 * Increment outside of htobe64 macro, because can be used more than once
716 * within the macro, and thus the operation may be undefined.
718 last_relay_viewer_session_id
++;
719 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
722 health_code_update();
724 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
729 health_code_update();
731 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
739 * Send the viewer the list of current sessions.
741 * Return 0 on success or else a negative value.
744 int viewer_list_sessions(struct relay_connection
*conn
)
747 struct lttng_viewer_list_sessions session_list
;
749 long approx_before
, approx_after
;
750 struct lttng_ht_iter iter
;
751 struct lttng_viewer_session send_session
;
752 struct relay_session
*session
;
754 DBG("List sessions received");
757 cds_lfht_count_nodes(conn
->sessions_ht
->ht
, &approx_before
, &count
,
759 session_list
.sessions_count
= htobe32(count
);
761 health_code_update();
763 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
768 health_code_update();
770 cds_lfht_for_each_entry(conn
->sessions_ht
->ht
, &iter
.iter
, session
,
772 health_code_update();
774 strncpy(send_session
.session_name
, session
->session_name
,
775 sizeof(send_session
.session_name
));
776 strncpy(send_session
.hostname
, session
->hostname
,
777 sizeof(send_session
.hostname
));
778 send_session
.id
= htobe64(session
->id
);
779 send_session
.live_timer
= htobe32(session
->live_timer
);
780 send_session
.clients
= htobe32(session
->viewer_refcount
);
781 send_session
.streams
= htobe32(session
->stream_count
);
783 health_code_update();
785 ret
= send_response(conn
->sock
, &send_session
, sizeof(send_session
));
790 health_code_update();
799 * Check if a connection is attached to a session.
800 * Return 1 if attached, 0 if not attached, a negative value on error.
803 int session_attached(struct relay_connection
*conn
, uint64_t session_id
)
805 struct relay_session
*session
;
808 if (!conn
->viewer_session
) {
811 cds_list_for_each_entry(session
,
812 &conn
->viewer_session
->sessions_head
,
813 viewer_session_list
) {
814 if (session
->id
== session_id
) {
825 * Delete all streams for a specific session ID.
827 static void destroy_viewer_streams_by_session(struct relay_session
*session
)
829 struct relay_viewer_stream
*stream
;
830 struct lttng_ht_iter iter
;
835 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, stream
,
837 struct ctf_trace
*ctf_trace
;
839 health_code_update();
840 if (stream
->session_id
!= session
->id
) {
844 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
848 viewer_stream_delete(stream
);
850 if (stream
->metadata_flag
) {
851 ctf_trace
->metadata_sent
= 0;
852 ctf_trace
->viewer_metadata_stream
= NULL
;
855 viewer_stream_destroy(ctf_trace
, stream
);
860 static void try_destroy_streams(struct relay_session
*session
)
862 struct ctf_trace
*ctf_trace
;
863 struct lttng_ht_iter iter
;
867 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
869 /* Attempt to destroy the ctf trace of that session. */
870 ctf_trace_try_destroy(session
, ctf_trace
);
877 static void cleanup_session(struct relay_connection
*conn
,
878 struct relay_session
*session
)
881 * Very important that this is done before destroying the session so we
882 * can put back every viewer stream reference from the ctf_trace.
884 destroy_viewer_streams_by_session(session
);
885 try_destroy_streams(session
);
886 cds_list_del(&session
->viewer_session_list
);
887 session_viewer_try_destroy(conn
->sessions_ht
, session
);
891 * Send the viewer the list of current sessions.
894 int viewer_get_new_streams(struct relay_connection
*conn
)
896 int ret
, send_streams
= 0;
897 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0;
898 struct lttng_viewer_new_streams_request request
;
899 struct lttng_viewer_new_streams_response response
;
900 struct relay_session
*session
;
905 DBG("Get new streams received");
907 health_code_update();
909 /* Receive the request from the connected client. */
910 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
914 session_id
= be64toh(request
.session_id
);
916 health_code_update();
918 memset(&response
, 0, sizeof(response
));
921 session
= session_find_by_id(conn
->sessions_ht
, session_id
);
923 DBG("Relay session %" PRIu64
" not found", session_id
);
924 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
928 if (!session_attached(conn
, session_id
)) {
930 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
935 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
937 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, NULL
, &nb_unsent
,
942 /* Only send back the newly created streams with the unsent ones. */
943 nb_streams
= nb_created
+ nb_unsent
;
944 response
.streams_count
= htobe32(nb_streams
);
947 * If the session is closed and we have no new streams to send,
948 * it means that the viewer has already received the whole trace
949 * for this session and should now close it.
951 if (nb_streams
== 0 && session
->close_flag
) {
953 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
955 * Remove the session from the attached list of the connection
956 * and try to destroy it.
958 cds_list_del(&session
->viewer_session_list
);
959 cleanup_session(conn
, session
);
964 health_code_update();
965 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
969 health_code_update();
972 * Unknown or empty session, just return gracefully, the viewer knows what
975 if (!send_streams
|| !nb_streams
) {
981 * Send stream and *DON'T* ignore the sent flag so every viewer streams
982 * that were not sent from that point will be sent to the viewer.
984 ret
= send_viewer_streams(conn
->sock
, session
, 0);
996 * Send the viewer the list of current sessions.
999 int viewer_attach_session(struct relay_connection
*conn
)
1001 int send_streams
= 0;
1003 uint32_t nb_streams
= 0;
1004 enum lttng_viewer_seek seek_type
;
1005 struct lttng_viewer_attach_session_request request
;
1006 struct lttng_viewer_attach_session_response response
;
1007 struct relay_session
*session
;
1011 health_code_update();
1013 /* Receive the request from the connected client. */
1014 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1019 health_code_update();
1021 memset(&response
, 0, sizeof(response
));
1023 if (!conn
->viewer_session
) {
1024 DBG("Client trying to attach before creating a live viewer session");
1025 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1030 session
= session_find_by_id(conn
->sessions_ht
,
1031 be64toh(request
.session_id
));
1033 DBG("Relay session %" PRIu64
" not found",
1034 be64toh(request
.session_id
));
1035 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1038 session_viewer_attach(session
);
1039 DBG("Attach session ID %" PRIu64
" received", be64toh(request
.session_id
));
1041 if (uatomic_read(&session
->viewer_refcount
) > 1) {
1042 DBG("Already a viewer attached");
1043 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1044 session_viewer_detach(session
);
1046 } else if (session
->live_timer
== 0) {
1047 DBG("Not live session");
1048 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1052 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1053 cds_list_add(&session
->viewer_session_list
,
1054 &conn
->viewer_session
->sessions_head
);
1057 switch (be32toh(request
.seek
)) {
1058 case LTTNG_VIEWER_SEEK_BEGINNING
:
1059 case LTTNG_VIEWER_SEEK_LAST
:
1060 seek_type
= be32toh(request
.seek
);
1063 ERR("Wrong seek parameter");
1064 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1069 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
, NULL
);
1073 response
.streams_count
= htobe32(nb_streams
);
1076 health_code_update();
1077 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1081 health_code_update();
1084 * Unknown or empty session, just return gracefully, the viewer knows what
1087 if (!send_streams
|| !nb_streams
) {
1092 /* Send stream and ignore the sent flag. */
1093 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1105 * Open the index file if needed for the given vstream.
1107 * If an index file is successfully opened, the index_read_fd of the stream is
1110 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1112 static int try_open_index(struct relay_viewer_stream
*vstream
,
1113 struct relay_stream
*rstream
)
1120 if (vstream
->index_read_fd
>= 0) {
1125 * First time, we open the index file and at least one index is ready. The
1126 * race between the read and write of the total_index_received is
1127 * acceptable here since the client will be notified to simply come back
1128 * and get the next index.
1130 if (rstream
->total_index_received
<= 0) {
1134 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1135 vstream
->tracefile_count
, vstream
->tracefile_count_current
);
1137 vstream
->index_read_fd
= ret
;
1147 * Check the status of the index for the given stream. This function updates
1148 * the index structure if needed and can destroy the vstream also for the HUP
1151 * Return 0 means that we can proceed with the index. A value of 1 means that
1152 * the index has been updated and is ready to be send to the client. A negative
1153 * value indicates an error that can't be handled.
1155 static int check_index_status(struct relay_viewer_stream
*vstream
,
1156 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1157 struct lttng_viewer_index
*index
)
1166 if (!rstream
->close_flag
) {
1167 /* Rotate on abort (overwrite). */
1168 if (vstream
->abort_flag
) {
1169 DBG("Viewer stream %" PRIu64
" rotate because of overwrite",
1170 vstream
->stream_handle
);
1171 ret
= viewer_stream_rotate(vstream
, rstream
);
1174 } else if (ret
== 1) {
1176 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1179 /* ret == 0 means successful so we continue. */
1182 /* Check if we are in the same trace file at this point. */
1183 if (rstream
->tracefile_count_current
== vstream
->tracefile_count_current
) {
1184 if (rstream
->beacon_ts_end
!= -1ULL &&
1185 vstream
->last_sent_index
== rstream
->total_index_received
) {
1187 * We've received a synchronization beacon and the last index
1188 * available has been sent, the index for now is inactive.
1190 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1191 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1192 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1194 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
1195 && !vstream
->close_write_flag
) {
1197 * Reader and writer are working in the same tracefile, so we care
1198 * about the number of index received and sent. Otherwise, we read
1201 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1205 /* Nothing to do with the index, continue with it. */
1207 } else if (rstream
->close_flag
&& vstream
->close_write_flag
&&
1208 vstream
->total_index_received
== vstream
->last_sent_index
) {
1209 /* Last index sent and current tracefile closed in write */
1210 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1213 vstream
->close_write_flag
= 1;
1221 viewer_stream_delete(vstream
);
1222 viewer_stream_destroy(trace
, vstream
);
1228 * Send the next index for a stream.
1230 * Return 0 on success or else a negative value.
1233 int viewer_get_next_index(struct relay_connection
*conn
)
1237 struct lttng_viewer_get_next_index request_index
;
1238 struct lttng_viewer_index viewer_index
;
1239 struct ctf_packet_index packet_index
;
1240 struct relay_viewer_stream
*vstream
;
1241 struct relay_stream
*rstream
;
1242 struct ctf_trace
*ctf_trace
;
1243 struct relay_session
*session
;
1247 DBG("Viewer get next index");
1249 health_code_update();
1251 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1255 health_code_update();
1258 vstream
= viewer_stream_find_by_id(be64toh(request_index
.stream_id
));
1264 session
= session_find_by_id(conn
->sessions_ht
, vstream
->session_id
);
1270 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
, vstream
->path_name
);
1273 memset(&viewer_index
, 0, sizeof(viewer_index
));
1276 * The viewer should not ask for index on metadata stream.
1278 if (vstream
->metadata_flag
) {
1279 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1283 rstream
= stream_find_by_id(relay_streams_ht
, vstream
->stream_handle
);
1286 /* Try to open an index if one is needed for that stream. */
1287 ret
= try_open_index(vstream
, rstream
);
1289 if (ret
== -ENOENT
) {
1291 * The index is created only when the first data packet arrives, it
1292 * might not be ready at the beginning of the session
1294 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1296 /* Unhandled error. */
1297 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1302 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1303 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1304 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1307 } else if (ret
== 1) {
1309 * This means the viewer index data structure has been populated by the
1310 * check call thus we now send back the reply to the client.
1314 /* At this point, ret MUST be 0 thus we continue with the get. */
1317 if (!ctf_trace
->metadata_received
||
1318 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1319 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1322 ret
= check_new_streams(conn
);
1325 } else if (ret
== 1) {
1326 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1329 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1330 pthread_mutex_lock(&vstream
->overwrite_lock
);
1331 if (vstream
->abort_flag
) {
1332 /* The file is being overwritten by the writer, we cannot use it. */
1333 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1334 ret
= viewer_stream_rotate(vstream
, rstream
);
1335 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1338 } else if (ret
== 1) {
1339 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1340 viewer_stream_delete(vstream
);
1341 viewer_stream_destroy(ctf_trace
, vstream
);
1343 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1348 read_ret
= lttng_read(vstream
->index_read_fd
, &packet_index
,
1349 sizeof(packet_index
));
1350 pthread_mutex_unlock(&vstream
->overwrite_lock
);
1351 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1353 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1354 viewer_stream_delete(vstream
);
1355 viewer_stream_destroy(ctf_trace
, vstream
);
1357 } else if (read_ret
< sizeof(packet_index
)) {
1358 pthread_mutex_lock(&rstream
->viewer_stream_rotation_lock
);
1359 if (vstream
->close_write_flag
) {
1360 ret
= viewer_stream_rotate(vstream
, rstream
);
1362 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1364 } else if (ret
== 1) {
1365 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1366 viewer_stream_delete(vstream
);
1367 viewer_stream_destroy(ctf_trace
, vstream
);
1369 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1372 ERR("Relay reading index file %d", vstream
->index_read_fd
);
1373 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1375 pthread_mutex_unlock(&rstream
->viewer_stream_rotation_lock
);
1378 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1379 vstream
->last_sent_index
++;
1383 * Indexes are stored in big endian, no need to switch before sending.
1385 viewer_index
.offset
= packet_index
.offset
;
1386 viewer_index
.packet_size
= packet_index
.packet_size
;
1387 viewer_index
.content_size
= packet_index
.content_size
;
1388 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1389 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1390 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1391 viewer_index
.stream_id
= packet_index
.stream_id
;
1394 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1395 health_code_update();
1397 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1401 health_code_update();
1403 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1404 vstream
->last_sent_index
, vstream
->stream_handle
);
1414 * Send the next index for a stream
1416 * Return 0 on success or else a negative value.
1419 int viewer_get_packet(struct relay_connection
*conn
)
1421 int ret
, send_data
= 0;
1425 struct lttng_viewer_get_packet get_packet_info
;
1426 struct lttng_viewer_trace_packet reply
;
1427 struct relay_viewer_stream
*stream
;
1428 struct relay_session
*session
;
1429 struct ctf_trace
*ctf_trace
;
1433 DBG2("Relay get data packet");
1435 health_code_update();
1437 ret
= recv_request(conn
->sock
, &get_packet_info
, sizeof(get_packet_info
));
1441 health_code_update();
1443 /* From this point on, the error label can be reached. */
1444 memset(&reply
, 0, sizeof(reply
));
1447 stream
= viewer_stream_find_by_id(be64toh(get_packet_info
.stream_id
));
1452 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1458 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1463 * First time we read this stream, we need open the tracefile, we should
1464 * only arrive here if an index has already been sent to the viewer, so the
1465 * tracefile must exist, if it does not it is a fatal error.
1467 if (stream
->read_fd
< 0) {
1468 char fullpath
[PATH_MAX
];
1470 if (stream
->tracefile_count
> 0) {
1471 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
, stream
->path_name
,
1472 stream
->channel_name
,
1473 stream
->tracefile_count_current
);
1475 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1476 stream
->channel_name
);
1481 ret
= open(fullpath
, O_RDONLY
);
1483 PERROR("Relay opening trace file");
1486 stream
->read_fd
= ret
;
1489 if (!ctf_trace
->metadata_received
||
1490 ctf_trace
->metadata_received
> ctf_trace
->metadata_sent
) {
1491 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1492 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1496 ret
= check_new_streams(conn
);
1499 } else if (ret
== 1) {
1500 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1501 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1505 len
= be32toh(get_packet_info
.len
);
1506 data
= zmalloc(len
);
1508 PERROR("relay data zmalloc");
1512 ret
= lseek(stream
->read_fd
, be64toh(get_packet_info
.offset
), SEEK_SET
);
1515 * If the read fd was closed by the streaming side, the
1516 * abort_flag will be set to 1, otherwise it is an error.
1518 if (stream
->abort_flag
== 0) {
1522 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1525 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1526 if (read_len
< len
) {
1528 * If the read fd was closed by the streaming side, the
1529 * abort_flag will be set to 1, otherwise it is an error.
1531 if (stream
->abort_flag
== 0) {
1532 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1534 be64toh(get_packet_info
.offset
));
1537 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_EOF
);
1541 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1542 reply
.len
= htobe32(len
);
1547 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1550 reply
.flags
= htobe32(reply
.flags
);
1552 health_code_update();
1554 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1558 health_code_update();
1561 health_code_update();
1562 ret
= send_response(conn
->sock
, data
, len
);
1566 health_code_update();
1569 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1570 be64toh(get_packet_info
.stream_id
));
1581 * Send the session's metadata
1583 * Return 0 on success else a negative value.
1586 int viewer_get_metadata(struct relay_connection
*conn
)
1592 struct lttng_viewer_get_metadata request
;
1593 struct lttng_viewer_metadata_packet reply
;
1594 struct relay_viewer_stream
*stream
;
1595 struct ctf_trace
*ctf_trace
;
1596 struct relay_session
*session
;
1600 DBG("Relay get metadata");
1602 health_code_update();
1604 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1608 health_code_update();
1610 memset(&reply
, 0, sizeof(reply
));
1613 stream
= viewer_stream_find_by_id(be64toh(request
.stream_id
));
1614 if (!stream
|| !stream
->metadata_flag
) {
1615 ERR("Invalid metadata stream");
1619 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
1625 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1628 assert(ctf_trace
->metadata_sent
<= ctf_trace
->metadata_received
);
1630 len
= ctf_trace
->metadata_received
- ctf_trace
->metadata_sent
;
1632 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1636 /* first time, we open the metadata file */
1637 if (stream
->read_fd
< 0) {
1638 char fullpath
[PATH_MAX
];
1640 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", stream
->path_name
,
1641 stream
->channel_name
);
1645 ret
= open(fullpath
, O_RDONLY
);
1647 PERROR("Relay opening metadata file");
1650 stream
->read_fd
= ret
;
1653 reply
.len
= htobe64(len
);
1654 data
= zmalloc(len
);
1656 PERROR("viewer metadata zmalloc");
1660 read_len
= lttng_read(stream
->read_fd
, data
, len
);
1661 if (read_len
< len
) {
1662 PERROR("Relay reading metadata file");
1665 ctf_trace
->metadata_sent
+= read_len
;
1666 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1670 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1673 health_code_update();
1674 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1678 health_code_update();
1681 ret
= send_response(conn
->sock
, data
, len
);
1687 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1688 be64toh(request
.stream_id
));
1690 DBG("Metadata sent");
1700 * Create a viewer session.
1702 * Return 0 on success or else a negative value.
1705 int viewer_create_session(struct relay_connection
*conn
)
1708 struct lttng_viewer_create_session_response resp
;
1710 DBG("Viewer create session received");
1712 memset(&resp
, 0, sizeof(resp
));
1713 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1714 conn
->viewer_session
= zmalloc(sizeof(*conn
->viewer_session
));
1715 if (!conn
->viewer_session
) {
1716 ERR("Allocation viewer session");
1717 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1720 CDS_INIT_LIST_HEAD(&conn
->viewer_session
->sessions_head
);
1723 health_code_update();
1724 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1728 health_code_update();
1737 * live_relay_unknown_command: send -1 if received unknown command
1740 void live_relay_unknown_command(struct relay_connection
*conn
)
1742 struct lttcomm_relayd_generic_reply reply
;
1744 memset(&reply
, 0, sizeof(reply
));
1745 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1746 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1750 * Process the commands received on the control socket
1753 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1754 struct relay_connection
*conn
)
1762 msg_value
= be32toh(recv_hdr
->cmd
);
1765 * Make sure we've done the version check before any command other then a
1766 * new client connection.
1768 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1769 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1774 switch (msg_value
) {
1775 case LTTNG_VIEWER_CONNECT
:
1776 ret
= viewer_connect(conn
);
1778 case LTTNG_VIEWER_LIST_SESSIONS
:
1779 ret
= viewer_list_sessions(conn
);
1781 case LTTNG_VIEWER_ATTACH_SESSION
:
1782 ret
= viewer_attach_session(conn
);
1784 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1785 ret
= viewer_get_next_index(conn
);
1787 case LTTNG_VIEWER_GET_PACKET
:
1788 ret
= viewer_get_packet(conn
);
1790 case LTTNG_VIEWER_GET_METADATA
:
1791 ret
= viewer_get_metadata(conn
);
1793 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1794 ret
= viewer_get_new_streams(conn
);
1796 case LTTNG_VIEWER_CREATE_SESSION
:
1797 ret
= viewer_create_session(conn
);
1800 ERR("Received unknown viewer command (%u)", be32toh(recv_hdr
->cmd
));
1801 live_relay_unknown_command(conn
);
1811 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1817 (void) lttng_poll_del(events
, pollfd
);
1819 ret
= close(pollfd
);
1821 ERR("Closing pollfd %d", pollfd
);
1826 * Delete and destroy a connection.
1828 * RCU read side lock MUST be acquired.
1830 static void destroy_connection(struct lttng_ht
*relay_connections_ht
,
1831 struct relay_connection
*conn
)
1833 struct relay_session
*session
, *tmp_session
;
1835 assert(relay_connections_ht
);
1838 connection_delete(relay_connections_ht
, conn
);
1840 if (!conn
->viewer_session
) {
1845 cds_list_for_each_entry_safe(session
, tmp_session
,
1846 &conn
->viewer_session
->sessions_head
,
1847 viewer_session_list
) {
1848 DBG("Cleaning connection of session ID %" PRIu64
, session
->id
);
1849 cleanup_session(conn
, session
);
1854 connection_destroy(conn
);
1858 * This thread does the actual work
1861 void *thread_worker(void *data
)
1865 struct relay_connection
*conn
;
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
;
1873 DBG("[thread] Live viewer relay worker started");
1875 rcu_register_thread();
1877 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1879 if (testpoint(relayd_thread_live_worker
)) {
1880 goto error_testpoint
;
1883 /* table of connections indexed on socket */
1884 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1885 if (!relay_connections_ht
) {
1886 goto relay_connections_ht_error
;
1889 ret
= create_thread_poll_set(&events
, 2);
1891 goto error_poll_create
;
1894 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1903 health_code_update();
1905 /* Infinite blocking call, waiting for transmission */
1906 DBG3("Relayd live viewer worker thread polling...");
1907 health_poll_entry();
1908 ret
= lttng_poll_wait(&events
, -1);
1912 * Restart interrupted system call.
1914 if (errno
== EINTR
) {
1923 * Process control. The control connection is prioritised so we don't
1924 * starve it with high throughput tracing data on the data
1927 for (i
= 0; i
< nb_fd
; i
++) {
1928 /* Fetch once the poll data */
1929 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1930 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1932 health_code_update();
1935 /* No activity for this FD (poll implementation). */
1939 /* Thread quit pipe has been closed. Killing thread. */
1940 ret
= check_thread_quit_pipe(pollfd
, revents
);
1946 /* Inspect the relay conn pipe for new connection */
1947 if (pollfd
== live_conn_pipe
[0]) {
1948 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1949 ERR("Relay live pipe error");
1951 } else if (revents
& LPOLLIN
) {
1952 ret
= lttng_read(live_conn_pipe
[0], &conn
, sizeof(conn
));
1956 conn
->sessions_ht
= sessions_ht
;
1957 connection_init(conn
);
1958 lttng_poll_add(&events
, conn
->sock
->fd
,
1959 LPOLLIN
| LPOLLRDHUP
);
1961 lttng_ht_add_unique_ulong(relay_connections_ht
,
1964 DBG("Connection socket %d added", conn
->sock
->fd
);
1968 conn
= connection_find_by_sock(relay_connections_ht
, pollfd
);
1969 /* If not found, there is a synchronization issue. */
1972 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1973 cleanup_connection_pollfd(&events
, pollfd
);
1974 destroy_connection(relay_connections_ht
, conn
);
1975 } else if (revents
& LPOLLIN
) {
1976 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1977 sizeof(recv_hdr
), 0);
1979 /* Connection closed */
1980 cleanup_connection_pollfd(&events
, pollfd
);
1981 destroy_connection(relay_connections_ht
, conn
);
1982 DBG("Viewer control conn closed with %d", pollfd
);
1984 ret
= process_control(&recv_hdr
, conn
);
1986 /* Clear the session on error. */
1987 cleanup_connection_pollfd(&events
, pollfd
);
1988 destroy_connection(relay_connections_ht
, conn
);
1989 DBG("Viewer connection closed with %d", pollfd
);
2000 lttng_poll_clean(&events
);
2002 /* Cleanup reamaining connection object. */
2004 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, conn
,
2006 health_code_update();
2007 destroy_connection(relay_connections_ht
, conn
);
2011 lttng_ht_destroy(relay_connections_ht
);
2012 relay_connections_ht_error
:
2013 /* Close relay conn pipes */
2014 utils_close_pipe(live_conn_pipe
);
2016 DBG("Viewer worker thread exited with error");
2018 DBG("Viewer worker thread cleanup complete");
2022 ERR("Health error occurred in %s", __func__
);
2024 health_unregister(health_relayd
);
2025 if (lttng_relay_stop_threads()) {
2026 ERR("Error stopping threads");
2028 rcu_unregister_thread();
2033 * Create the relay command pipe to wake thread_manage_apps.
2034 * Closed in cleanup().
2036 static int create_conn_pipe(void)
2038 return utils_create_pipe_cloexec(live_conn_pipe
);
2041 int relayd_live_join(void)
2043 int ret
, retval
= 0;
2046 ret
= pthread_join(live_listener_thread
, &status
);
2049 PERROR("pthread_join live listener");
2053 ret
= pthread_join(live_worker_thread
, &status
);
2056 PERROR("pthread_join live worker");
2060 ret
= pthread_join(live_dispatcher_thread
, &status
);
2063 PERROR("pthread_join live dispatcher");
2067 cleanup_relayd_live();
2075 int relayd_live_create(struct lttng_uri
*uri
,
2076 struct relay_local_data
*relay_ctx
)
2078 int ret
= 0, retval
= 0;
2084 goto exit_init_data
;
2088 /* Check if daemon is UID = 0 */
2089 is_root
= !getuid();
2092 if (live_uri
->port
< 1024) {
2093 ERR("Need to be root to use ports < 1024");
2095 goto exit_init_data
;
2099 /* Setup the thread apps communication pipe. */
2100 if (create_conn_pipe()) {
2102 goto exit_init_data
;
2105 /* Init relay command queue. */
2106 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2108 /* Set up max poll set size */
2109 lttng_poll_set_max_size();
2111 /* Setup the dispatcher thread */
2112 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2113 thread_dispatcher
, (void *) NULL
);
2116 PERROR("pthread_create viewer dispatcher");
2118 goto exit_dispatcher_thread
;
2121 /* Setup the worker thread */
2122 ret
= pthread_create(&live_worker_thread
, NULL
,
2123 thread_worker
, relay_ctx
);
2126 PERROR("pthread_create viewer worker");
2128 goto exit_worker_thread
;
2131 /* Setup the listener thread */
2132 ret
= pthread_create(&live_listener_thread
, NULL
,
2133 thread_listener
, (void *) NULL
);
2136 PERROR("pthread_create viewer listener");
2138 goto exit_listener_thread
;
2142 * All OK, started all threads.
2147 ret
= pthread_join(live_listener_thread
, &status
);
2150 PERROR("pthread_join live listener");
2153 exit_listener_thread
:
2155 ret
= pthread_join(live_worker_thread
, &status
);
2158 PERROR("pthread_join live worker");
2163 ret
= pthread_join(live_dispatcher_thread
, &status
);
2166 PERROR("pthread_join live dispatcher");
2169 exit_dispatcher_thread
:
2172 cleanup_relayd_live();