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.
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
38 #include <urcu/futex.h>
39 #include <urcu/uatomic.h>
40 #include <urcu/rculist.h>
45 #include <lttng/lttng.h>
46 #include <common/common.h>
47 #include <common/compat/poll.h>
48 #include <common/compat/socket.h>
49 #include <common/compat/endian.h>
50 #include <common/defaults.h>
51 #include <common/futex.h>
52 #include <common/index/index.h>
53 #include <common/sessiond-comm/sessiond-comm.h>
54 #include <common/sessiond-comm/inet.h>
55 #include <common/sessiond-comm/relayd.h>
56 #include <common/uri.h>
57 #include <common/utils.h>
61 #include "lttng-relayd.h"
63 #include "health-relayd.h"
64 #include "testpoint.h"
65 #include "viewer-stream.h"
68 #include "ctf-trace.h"
69 #include "connection.h"
70 #include "viewer-session.h"
72 #define SESSION_BUF_DEFAULT_COUNT 16
74 static struct lttng_uri
*live_uri
;
77 * This pipe is used to inform the worker thread that a command is queued and
78 * ready to be processed.
80 static int live_conn_pipe
[2] = { -1, -1 };
82 /* Shared between threads */
83 static int live_dispatch_thread_exit
;
85 static pthread_t live_listener_thread
;
86 static pthread_t live_dispatcher_thread
;
87 static pthread_t live_worker_thread
;
90 * Relay command queue.
92 * The live_thread_listener and live_thread_dispatcher communicate with this
95 static struct relay_conn_queue viewer_conn_queue
;
97 static uint64_t last_relay_viewer_session_id
;
98 static pthread_mutex_t last_relay_viewer_session_id_lock
=
99 PTHREAD_MUTEX_INITIALIZER
;
105 void cleanup_relayd_live(void)
113 * Receive a request buffer using a given socket, destination allocated buffer
116 * Return the size of the received message or else a negative value on error
117 * with errno being set by recvmsg() syscall.
120 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
124 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
125 if (ret
< 0 || ret
!= size
) {
127 /* Orderly shutdown. Not necessary to print an error. */
128 DBG("Socket %d did an orderly shutdown", sock
->fd
);
130 ERR("Relay failed to receive request.");
139 * Send a response buffer using a given socket, source allocated buffer of
142 * Return the size of the sent message or else a negative value on error with
143 * errno being set by sendmsg() syscall.
146 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
150 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
152 ERR("Relayd failed to send response.");
159 * Atomically check if new streams got added in one of the sessions attached
160 * and reset the flag to 0.
162 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
166 int check_new_streams(struct relay_connection
*conn
)
168 struct relay_session
*session
;
169 unsigned long current_val
;
172 if (!conn
->viewer_session
) {
176 cds_list_for_each_entry_rcu(session
,
177 &conn
->viewer_session
->session_list
,
178 viewer_session_node
) {
179 if (!session_get(session
)) {
182 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
184 session_put(session
);
195 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
196 * this function should ignore the sent flag or not.
198 * Return 0 on success or else a negative value.
201 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
202 struct relay_session
*session
, unsigned int ignore_sent_flag
)
205 struct lttng_viewer_stream send_stream
;
206 struct lttng_ht_iter iter
;
207 struct relay_viewer_stream
*vstream
;
211 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
213 struct ctf_trace
*ctf_trace
;
215 health_code_update();
217 if (!viewer_stream_get(vstream
)) {
221 pthread_mutex_lock(&vstream
->stream
->lock
);
222 /* Ignore if not the same session. */
223 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
224 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
225 pthread_mutex_unlock(&vstream
->stream
->lock
);
226 viewer_stream_put(vstream
);
230 ctf_trace
= vstream
->stream
->trace
;
231 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
232 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
233 send_stream
.metadata_flag
= htobe32(
234 vstream
->stream
->is_metadata
);
235 strncpy(send_stream
.path_name
, vstream
->path_name
,
236 sizeof(send_stream
.path_name
));
237 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
238 sizeof(send_stream
.channel_name
));
240 DBG("Sending stream %" PRIu64
" to viewer",
241 vstream
->stream
->stream_handle
);
242 vstream
->sent_flag
= 1;
243 pthread_mutex_unlock(&vstream
->stream
->lock
);
245 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
246 viewer_stream_put(vstream
);
260 * Create every viewer stream possible for the given session with the seek
261 * type. Three counters *can* be return which are in order the total amount of
262 * viewer stream of the session, the number of unsent stream and the number of
263 * stream created. Those counters can be NULL and thus will be ignored.
265 * Return 0 on success or else a negative value.
268 int make_viewer_streams(struct relay_session
*session
,
269 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
270 uint32_t *nb_created
)
273 struct lttng_ht_iter iter
;
274 struct ctf_trace
*ctf_trace
;
279 * Hold the session lock to ensure that we see either none or
280 * all initial streams for a session, but no intermediate state.
282 pthread_mutex_lock(&session
->lock
);
285 * Create viewer streams for relay streams that are ready to be
286 * used for a the given session id only.
289 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
291 struct relay_stream
*stream
;
293 health_code_update();
295 if (!ctf_trace_get(ctf_trace
)) {
299 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
300 struct relay_viewer_stream
*vstream
;
302 if (!stream_get(stream
)) {
306 * stream published is protected by the session
309 if (!stream
->published
) {
312 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
314 vstream
= viewer_stream_create(stream
, seek_t
);
317 ctf_trace_put(ctf_trace
);
323 /* Update number of created stream counter. */
327 if (!vstream
->sent_flag
&& nb_unsent
) {
328 /* Update number of unsent stream counter. */
331 viewer_stream_put(vstream
);
333 /* Update number of total stream counter. */
340 ctf_trace_put(ctf_trace
);
347 pthread_mutex_unlock(&session
->lock
);
351 int relayd_live_stop(void)
353 /* Stop dispatch thread */
354 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
355 futex_nto1_wake(&viewer_conn_queue
.futex
);
360 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
363 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
367 if (events
== NULL
|| size
== 0) {
372 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
378 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
390 * Check if the thread quit pipe was triggered.
392 * Return 1 if it was triggered else 0;
395 int check_thread_quit_pipe(int fd
, uint32_t events
)
397 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
405 * Create and init socket from uri.
408 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
411 struct lttcomm_sock
*sock
= NULL
;
413 sock
= lttcomm_alloc_sock_from_uri(uri
);
415 ERR("Allocating socket");
419 ret
= lttcomm_create_sock(sock
);
423 DBG("Listening on sock %d for live", sock
->fd
);
425 ret
= sock
->ops
->bind(sock
);
430 ret
= sock
->ops
->listen(sock
, -1);
440 lttcomm_destroy_sock(sock
);
446 * This thread manages the listening for new connections on the network
449 void *thread_listener(void *data
)
451 int i
, ret
, pollfd
, err
= -1;
452 uint32_t revents
, nb_fd
;
453 struct lttng_poll_event events
;
454 struct lttcomm_sock
*live_control_sock
;
456 DBG("[thread] Relay live listener started");
458 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
460 health_code_update();
462 live_control_sock
= init_socket(live_uri
);
463 if (!live_control_sock
) {
464 goto error_sock_control
;
467 /* Pass 2 as size here for the thread quit pipe and control sockets. */
468 ret
= create_thread_poll_set(&events
, 2);
470 goto error_create_poll
;
473 /* Add the control socket */
474 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
479 lttng_relay_notify_ready();
481 if (testpoint(relayd_thread_live_listener
)) {
482 goto error_testpoint
;
486 health_code_update();
488 DBG("Listener accepting live viewers connections");
492 ret
= lttng_poll_wait(&events
, -1);
496 * Restart interrupted system call.
498 if (errno
== EINTR
) {
505 DBG("Relay new viewer connection received");
506 for (i
= 0; i
< nb_fd
; i
++) {
507 health_code_update();
509 /* Fetch once the poll data */
510 revents
= LTTNG_POLL_GETEV(&events
, i
);
511 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
514 /* No activity for this FD (poll implementation). */
518 /* Thread quit pipe has been closed. Killing thread. */
519 ret
= check_thread_quit_pipe(pollfd
, revents
);
525 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
526 ERR("socket poll error");
528 } else if (revents
& LPOLLIN
) {
530 * A new connection is requested, therefore a
531 * viewer connection is allocated in this
532 * thread, enqueued to a global queue and
533 * dequeued (and freed) in the worker thread.
536 struct relay_connection
*new_conn
;
537 struct lttcomm_sock
*newsock
;
539 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
541 PERROR("accepting control sock");
544 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
546 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
549 PERROR("setsockopt inet");
550 lttcomm_destroy_sock(newsock
);
553 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
555 lttcomm_destroy_sock(newsock
);
558 /* Ownership assumed by the connection. */
561 /* Enqueue request for the dispatcher thread. */
562 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
566 * Wake the dispatch queue futex.
567 * Implicit memory barrier with the
568 * exchange in cds_wfcq_enqueue.
570 futex_nto1_wake(&viewer_conn_queue
.futex
);
579 lttng_poll_clean(&events
);
581 if (live_control_sock
->fd
>= 0) {
582 ret
= live_control_sock
->ops
->close(live_control_sock
);
587 lttcomm_destroy_sock(live_control_sock
);
591 DBG("Live viewer listener thread exited with error");
593 health_unregister(health_relayd
);
594 DBG("Live viewer listener thread cleanup complete");
595 if (lttng_relay_stop_threads()) {
596 ERR("Error stopping threads");
602 * This thread manages the dispatching of the requests to worker threads
605 void *thread_dispatcher(void *data
)
609 struct cds_wfcq_node
*node
;
610 struct relay_connection
*conn
= NULL
;
612 DBG("[thread] Live viewer relay dispatcher started");
614 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
616 if (testpoint(relayd_thread_live_dispatcher
)) {
617 goto error_testpoint
;
620 health_code_update();
622 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
623 health_code_update();
625 /* Atomically prepare the queue futex */
626 futex_nto1_prepare(&viewer_conn_queue
.futex
);
629 health_code_update();
631 /* Dequeue commands */
632 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
633 &viewer_conn_queue
.tail
);
635 DBG("Woken up but nothing in the live-viewer "
636 "relay command queue");
637 /* Continue thread execution */
640 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
641 DBG("Dispatching viewer request waiting on sock %d",
645 * Inform worker thread of the new request. This
646 * call is blocking so we can be assured that
647 * the data will be read at some point in time
648 * or wait to the end of the world :)
650 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
652 PERROR("write conn pipe");
653 connection_put(conn
);
656 } while (node
!= NULL
);
658 /* Futex wait on queue. Blocking call on futex() */
660 futex_nto1_wait(&viewer_conn_queue
.futex
);
664 /* Normal exit, no error */
671 ERR("Health error occurred in %s", __func__
);
673 health_unregister(health_relayd
);
674 DBG("Live viewer dispatch thread dying");
675 if (lttng_relay_stop_threads()) {
676 ERR("Error stopping threads");
682 * Establish connection with the viewer and check the versions.
684 * Return 0 on success or else negative value.
687 int viewer_connect(struct relay_connection
*conn
)
690 struct lttng_viewer_connect reply
, msg
;
692 conn
->version_check_done
= 1;
694 health_code_update();
696 DBG("Viewer is establishing a connection to the relayd.");
698 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
703 health_code_update();
705 memset(&reply
, 0, sizeof(reply
));
706 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
707 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
709 /* Major versions must be the same */
710 if (reply
.major
!= be32toh(msg
.major
)) {
711 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
712 reply
.major
, be32toh(msg
.major
));
717 conn
->major
= reply
.major
;
718 /* We adapt to the lowest compatible version */
719 if (reply
.minor
<= be32toh(msg
.minor
)) {
720 conn
->minor
= reply
.minor
;
722 conn
->minor
= be32toh(msg
.minor
);
725 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
726 conn
->type
= RELAY_VIEWER_COMMAND
;
727 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
728 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
730 ERR("Unknown connection type : %u", be32toh(msg
.type
));
735 reply
.major
= htobe32(reply
.major
);
736 reply
.minor
= htobe32(reply
.minor
);
737 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
739 * Increment outside of htobe64 macro, because the argument can
740 * be used more than once within the macro, and thus the
741 * operation may be undefined.
743 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
744 last_relay_viewer_session_id
++;
745 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
746 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
749 health_code_update();
751 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
756 health_code_update();
758 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
766 * Send the viewer the list of current sessions.
767 * We need to create a copy of the hash table content because otherwise
768 * we cannot assume the number of entries stays the same between getting
769 * the number of HT elements and iteration over the HT.
771 * Return 0 on success or else a negative value.
774 int viewer_list_sessions(struct relay_connection
*conn
)
777 struct lttng_viewer_list_sessions session_list
;
778 struct lttng_ht_iter iter
;
779 struct relay_session
*session
;
780 struct lttng_viewer_session
*send_session_buf
= NULL
;
781 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
784 DBG("List sessions received");
786 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
787 if (!send_session_buf
) {
792 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
794 struct lttng_viewer_session
*send_session
;
796 health_code_update();
798 if (count
>= buf_count
) {
799 struct lttng_viewer_session
*newbuf
;
800 uint32_t new_buf_count
= buf_count
<< 1;
802 newbuf
= realloc(send_session_buf
,
803 new_buf_count
* sizeof(*send_session_buf
));
809 send_session_buf
= newbuf
;
810 buf_count
= new_buf_count
;
812 send_session
= &send_session_buf
[count
];
813 strncpy(send_session
->session_name
, session
->session_name
,
814 sizeof(send_session
->session_name
));
815 strncpy(send_session
->hostname
, session
->hostname
,
816 sizeof(send_session
->hostname
));
817 send_session
->id
= htobe64(session
->id
);
818 send_session
->live_timer
= htobe32(session
->live_timer
);
819 if (session
->viewer_attached
) {
820 send_session
->clients
= htobe32(1);
822 send_session
->clients
= htobe32(0);
824 send_session
->streams
= htobe32(session
->stream_count
);
829 session_list
.sessions_count
= htobe32(count
);
831 health_code_update();
833 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
838 health_code_update();
840 ret
= send_response(conn
->sock
, send_session_buf
,
841 count
* sizeof(*send_session_buf
));
845 health_code_update();
849 free(send_session_buf
);
854 * Send the viewer the list of current streams.
857 int viewer_get_new_streams(struct relay_connection
*conn
)
859 int ret
, send_streams
= 0;
860 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
861 struct lttng_viewer_new_streams_request request
;
862 struct lttng_viewer_new_streams_response response
;
863 struct relay_session
*session
;
868 DBG("Get new streams received");
870 health_code_update();
872 /* Receive the request from the connected client. */
873 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
877 session_id
= be64toh(request
.session_id
);
879 health_code_update();
881 memset(&response
, 0, sizeof(response
));
883 session
= session_get_by_id(session_id
);
885 DBG("Relay session %" PRIu64
" not found", session_id
);
886 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
890 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
892 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
897 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
899 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
902 goto end_put_session
;
904 /* Only send back the newly created streams with the unsent ones. */
905 nb_streams
= nb_created
+ nb_unsent
;
906 response
.streams_count
= htobe32(nb_streams
);
909 * If the session is closed and we have no new streams to send,
910 * it means that the viewer has already received the whole trace
911 * for this session and should now close it.
913 if (nb_total
== 0 && session
->connection_closed
) {
915 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
920 health_code_update();
921 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
923 goto end_put_session
;
925 health_code_update();
928 * Unknown or empty session, just return gracefully, the viewer
929 * knows what is happening.
931 if (!send_streams
|| !nb_streams
) {
933 goto end_put_session
;
937 * Send stream and *DON'T* ignore the sent flag so every viewer
938 * streams that were not sent from that point will be sent to
941 ret
= send_viewer_streams(conn
->sock
, session
, 0);
943 goto end_put_session
;
948 session_put(session
);
955 * Send the viewer the list of current sessions.
958 int viewer_attach_session(struct relay_connection
*conn
)
960 int send_streams
= 0;
962 uint32_t nb_streams
= 0;
963 enum lttng_viewer_seek seek_type
;
964 struct lttng_viewer_attach_session_request request
;
965 struct lttng_viewer_attach_session_response response
;
966 struct relay_session
*session
= NULL
;
970 health_code_update();
972 /* Receive the request from the connected client. */
973 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
978 health_code_update();
980 memset(&response
, 0, sizeof(response
));
982 if (!conn
->viewer_session
) {
983 DBG("Client trying to attach before creating a live viewer session");
984 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
988 session
= session_get_by_id(be64toh(request
.session_id
));
990 DBG("Relay session %" PRIu64
" not found",
991 be64toh(request
.session_id
));
992 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
995 DBG("Attach session ID %" PRIu64
" received",
996 be64toh(request
.session_id
));
998 if (session
->live_timer
== 0) {
999 DBG("Not live session");
1000 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1005 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1007 DBG("Already a viewer attached");
1008 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1012 switch (be32toh(request
.seek
)) {
1013 case LTTNG_VIEWER_SEEK_BEGINNING
:
1014 case LTTNG_VIEWER_SEEK_LAST
:
1015 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1016 seek_type
= be32toh(request
.seek
);
1019 ERR("Wrong seek parameter");
1020 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1025 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
, NULL
);
1027 goto end_put_session
;
1029 response
.streams_count
= htobe32(nb_streams
);
1032 health_code_update();
1033 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1035 goto end_put_session
;
1037 health_code_update();
1040 * Unknown or empty session, just return gracefully, the viewer
1041 * knows what is happening.
1043 if (!send_streams
|| !nb_streams
) {
1045 goto end_put_session
;
1048 /* Send stream and ignore the sent flag. */
1049 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1051 goto end_put_session
;
1056 session_put(session
);
1063 * Open the index file if needed for the given vstream.
1065 * If an index file is successfully opened, the vstream index_fd set with
1068 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1070 * Called with rstream lock held.
1072 static int try_open_index(struct relay_viewer_stream
*vstream
,
1073 struct relay_stream
*rstream
)
1077 if (vstream
->index_fd
) {
1082 * First time, we open the index file and at least one index is ready.
1084 if (rstream
->total_index_received
== 0) {
1088 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1089 vstream
->stream
->tracefile_count
,
1090 vstream
->current_tracefile_id
);
1092 vstream
->index_fd
= stream_fd_create(ret
);
1093 if (!vstream
->index_fd
) {
1109 * Check the status of the index for the given stream. This function
1110 * updates the index structure if needed and can put (close) the vstream
1111 * in the HUP situation.
1113 * Return 0 means that we can proceed with the index. A value of 1 means
1114 * that the index has been updated and is ready to be sent to the
1115 * client. A negative value indicates an error that can't be handled.
1117 * Called with rstream lock held.
1119 static int check_index_status(struct relay_viewer_stream
*vstream
,
1120 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1121 struct lttng_viewer_index
*index
)
1125 if (trace
->session
->connection_closed
1126 && rstream
->total_index_received
1127 == vstream
->last_sent_index
) {
1128 /* Last index sent and session connection is closed. */
1129 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1131 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1132 rstream
->total_index_received
1133 == vstream
->last_sent_index
) {
1135 * We've received a synchronization beacon and the last index
1136 * available has been sent, the index for now is inactive.
1138 * In this case, we have received a beacon which allows us to
1139 * inform the client of a time interval during which we can
1140 * guarantee that there are no events to read (and never will
1143 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1144 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1145 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1147 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
) {
1149 * This actually checks the case where recv == last_sent.
1150 * In this case, we have not received a beacon. Therefore, we
1151 * can only ask the client to retry later.
1153 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1155 } else if (!viewer_stream_is_tracefile_seq_readable(vstream
,
1156 vstream
->current_tracefile_seq
)) {
1158 * The producer has overwritten our current file. We
1161 DBG("Viewer stream %" PRIu64
" rotation due to overwrite",
1162 vstream
->stream
->stream_handle
);
1163 ret
= viewer_stream_rotate(vstream
);
1166 } else if (ret
== 1) {
1167 /* EOF across entire stream. */
1168 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1171 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1172 vstream
->current_tracefile_seq
));
1173 /* ret == 0 means successful so we continue. */
1180 * Use EOF on current index file to find out when we
1183 read_ret
= lttng_read(vstream
->index_fd
->fd
, tmp
, 1);
1184 if (read_ret
== 1) {
1187 /* There is still data to read. Rewind position. */
1188 seek_ret
= lseek(vstream
->index_fd
->fd
, -1, SEEK_CUR
);
1194 } else if (read_ret
== 0) {
1195 /* EOF. We need to rotate. */
1196 DBG("Viewer stream %" PRIu64
" rotation due to EOF",
1197 vstream
->stream
->stream_handle
);
1198 ret
= viewer_stream_rotate(vstream
);
1201 } else if (ret
== 1) {
1202 /* EOF across entire stream. */
1203 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1206 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1207 vstream
->current_tracefile_seq
));
1208 /* ret == 0 means successful so we continue. */
1211 /* Error reading index. */
1219 viewer_stream_put(vstream
);
1225 * Send the next index for a stream.
1227 * Return 0 on success or else a negative value.
1230 int viewer_get_next_index(struct relay_connection
*conn
)
1234 struct lttng_viewer_get_next_index request_index
;
1235 struct lttng_viewer_index viewer_index
;
1236 struct ctf_packet_index packet_index
;
1237 struct relay_viewer_stream
*vstream
= NULL
;
1238 struct relay_stream
*rstream
= NULL
;
1239 struct ctf_trace
*ctf_trace
= NULL
;
1240 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1244 DBG("Viewer get next index");
1246 memset(&viewer_index
, 0, sizeof(viewer_index
));
1247 health_code_update();
1249 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1253 health_code_update();
1255 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1261 /* Use back. ref. Protected by refcounts. */
1262 rstream
= vstream
->stream
;
1263 ctf_trace
= rstream
->trace
;
1265 /* metadata_viewer_stream may be NULL. */
1266 metadata_viewer_stream
=
1267 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1269 pthread_mutex_lock(&rstream
->lock
);
1272 * The viewer should not ask for index on metadata stream.
1274 if (rstream
->is_metadata
) {
1275 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1279 /* Try to open an index if one is needed for that stream. */
1280 ret
= try_open_index(vstream
, rstream
);
1282 if (ret
== -ENOENT
) {
1284 * The index is created only when the first data
1285 * packet arrives, it might not be ready at the
1286 * beginning of the session
1288 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1290 /* Unhandled error. */
1291 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1296 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1299 } else if (ret
== 1) {
1301 * We have no index to send and check_index_status has populated
1302 * viewer_index's status.
1306 /* At this point, ret is 0 thus we will be able to read the index. */
1310 * vstream->stream_fd may be NULL if it has been closed by
1311 * tracefile rotation, or if we are at the beginning of the
1312 * stream. We open the data stream file here to protect against
1313 * overwrite caused by tracefile rotation (in association with
1314 * unlink performed before overwrite).
1316 if (!vstream
->stream_fd
) {
1317 char fullpath
[PATH_MAX
];
1319 if (vstream
->stream
->tracefile_count
> 0) {
1320 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1322 vstream
->channel_name
,
1323 vstream
->current_tracefile_id
);
1325 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1327 vstream
->channel_name
);
1332 ret
= open(fullpath
, O_RDONLY
);
1334 PERROR("Relay opening trace file");
1337 vstream
->stream_fd
= stream_fd_create(ret
);
1338 if (!vstream
->stream_fd
) {
1346 ret
= check_new_streams(conn
);
1348 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1350 } else if (ret
== 1) {
1351 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1354 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1355 sizeof(packet_index
));
1356 if (read_ret
< sizeof(packet_index
)) {
1357 ERR("Relay reading index file %d returned %zd",
1358 vstream
->index_fd
->fd
, read_ret
);
1359 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1362 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1363 vstream
->last_sent_index
++;
1367 * Indexes are stored in big endian, no need to switch before sending.
1369 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1370 rstream
->stream_handle
,
1371 be64toh(packet_index
.offset
));
1372 viewer_index
.offset
= packet_index
.offset
;
1373 viewer_index
.packet_size
= packet_index
.packet_size
;
1374 viewer_index
.content_size
= packet_index
.content_size
;
1375 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1376 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1377 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1378 viewer_index
.stream_id
= packet_index
.stream_id
;
1381 pthread_mutex_unlock(&rstream
->lock
);
1383 if (metadata_viewer_stream
) {
1384 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1385 DBG("get next index metadata check: recv %" PRIu64
1387 metadata_viewer_stream
->stream
->metadata_received
,
1388 metadata_viewer_stream
->metadata_sent
);
1389 if (!metadata_viewer_stream
->stream
->metadata_received
||
1390 metadata_viewer_stream
->stream
->metadata_received
>
1391 metadata_viewer_stream
->metadata_sent
) {
1392 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1394 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1397 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1398 health_code_update();
1400 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1404 health_code_update();
1406 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1407 vstream
->last_sent_index
,
1408 vstream
->stream
->stream_handle
);
1410 if (metadata_viewer_stream
) {
1411 viewer_stream_put(metadata_viewer_stream
);
1414 viewer_stream_put(vstream
);
1419 pthread_mutex_unlock(&rstream
->lock
);
1420 if (metadata_viewer_stream
) {
1421 viewer_stream_put(metadata_viewer_stream
);
1423 viewer_stream_put(vstream
);
1428 * Send the next index for a stream
1430 * Return 0 on success or else a negative value.
1433 int viewer_get_packet(struct relay_connection
*conn
)
1435 int ret
, send_data
= 0;
1439 struct lttng_viewer_get_packet get_packet_info
;
1440 struct lttng_viewer_trace_packet reply
;
1441 struct relay_viewer_stream
*vstream
= NULL
;
1442 struct ctf_trace
*ctf_trace
;
1443 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1445 DBG2("Relay get data packet");
1447 health_code_update();
1449 ret
= recv_request(conn
->sock
, &get_packet_info
,
1450 sizeof(get_packet_info
));
1454 health_code_update();
1456 /* From this point on, the error label can be reached. */
1457 memset(&reply
, 0, sizeof(reply
));
1459 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1464 ctf_trace
= vstream
->stream
->trace
;
1466 /* metadata_viewer_stream may be NULL. */
1467 metadata_viewer_stream
=
1468 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1470 if (metadata_viewer_stream
) {
1471 bool get_packet_err
= false;
1473 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1474 DBG("get packet metadata check: recv %" PRIu64
" sent %" PRIu64
,
1475 metadata_viewer_stream
->stream
->metadata_received
,
1476 metadata_viewer_stream
->metadata_sent
);
1477 if (!metadata_viewer_stream
->stream
->metadata_received
||
1478 metadata_viewer_stream
->stream
->metadata_received
>
1479 metadata_viewer_stream
->metadata_sent
) {
1481 * We prevent the client from reading a data stream as
1482 * long as there is metadata left to consume. This
1483 * ensures that the client won't receive data of which
1484 * it can't make sense.
1486 get_packet_err
= true;
1488 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1489 viewer_stream_put(metadata_viewer_stream
);
1490 if (get_packet_err
) {
1491 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1492 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1493 goto send_reply_nolock
;
1497 pthread_mutex_lock(&vstream
->stream
->lock
);
1499 * The vstream->stream_fd used here has been opened by
1500 * get_next_index. It is opened there because this is what
1501 * allows us to grab a reference to the file with stream lock
1502 * held, thus protecting us against overwrite caused by
1503 * tracefile rotation. Since tracefile rotation unlinks the old
1504 * data file, we are ensured that we won't have our data
1505 * overwritten under us.
1507 ret
= check_new_streams(conn
);
1510 } else if (ret
== 1) {
1511 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1512 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1516 len
= be32toh(get_packet_info
.len
);
1517 data
= zmalloc(len
);
1519 PERROR("relay data zmalloc");
1523 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1526 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1527 be64toh(get_packet_info
.offset
));
1530 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1531 if (read_len
< len
) {
1532 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1533 vstream
->stream_fd
->fd
,
1534 be64toh(get_packet_info
.offset
));
1537 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1538 reply
.len
= htobe32(len
);
1543 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1547 pthread_mutex_unlock(&vstream
->stream
->lock
);
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
));
1576 viewer_stream_put(vstream
);
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
*vstream
= NULL
;
1599 DBG("Relay get metadata");
1601 health_code_update();
1603 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1607 health_code_update();
1609 memset(&reply
, 0, sizeof(reply
));
1611 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1613 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1616 pthread_mutex_lock(&vstream
->stream
->lock
);
1617 if (!vstream
->stream
->is_metadata
) {
1618 ERR("Invalid metadata stream");
1622 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1624 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1626 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1630 /* first time, we open the metadata file */
1631 if (!vstream
->stream_fd
) {
1632 char fullpath
[PATH_MAX
];
1634 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1635 vstream
->channel_name
);
1639 ret
= open(fullpath
, O_RDONLY
);
1641 PERROR("Relay opening metadata file");
1644 vstream
->stream_fd
= stream_fd_create(ret
);
1645 if (!vstream
->stream_fd
) {
1653 reply
.len
= htobe64(len
);
1654 data
= zmalloc(len
);
1656 PERROR("viewer metadata zmalloc");
1660 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1661 if (read_len
< len
) {
1662 PERROR("Relay reading metadata file");
1665 vstream
->metadata_sent
+= read_len
;
1666 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1667 && vstream
->stream
->closed
) {
1668 /* Release ownership for the viewer metadata stream. */
1669 viewer_stream_put(vstream
);
1672 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1677 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1680 health_code_update();
1682 pthread_mutex_unlock(&vstream
->stream
->lock
);
1684 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1688 health_code_update();
1691 ret
= send_response(conn
->sock
, data
, len
);
1697 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1698 be64toh(request
.stream_id
));
1700 DBG("Metadata sent");
1706 viewer_stream_put(vstream
);
1712 * Create a viewer session.
1714 * Return 0 on success or else a negative value.
1717 int viewer_create_session(struct relay_connection
*conn
)
1720 struct lttng_viewer_create_session_response resp
;
1722 DBG("Viewer create session received");
1724 memset(&resp
, 0, sizeof(resp
));
1725 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1726 conn
->viewer_session
= viewer_session_create();
1727 if (!conn
->viewer_session
) {
1728 ERR("Allocation viewer session");
1729 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1734 health_code_update();
1735 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1739 health_code_update();
1748 * live_relay_unknown_command: send -1 if received unknown command
1751 void live_relay_unknown_command(struct relay_connection
*conn
)
1753 struct lttcomm_relayd_generic_reply reply
;
1755 memset(&reply
, 0, sizeof(reply
));
1756 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1757 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1761 * Process the commands received on the control socket
1764 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1765 struct relay_connection
*conn
)
1770 msg_value
= be32toh(recv_hdr
->cmd
);
1773 * Make sure we've done the version check before any command other then a
1774 * new client connection.
1776 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1777 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1782 switch (msg_value
) {
1783 case LTTNG_VIEWER_CONNECT
:
1784 ret
= viewer_connect(conn
);
1786 case LTTNG_VIEWER_LIST_SESSIONS
:
1787 ret
= viewer_list_sessions(conn
);
1789 case LTTNG_VIEWER_ATTACH_SESSION
:
1790 ret
= viewer_attach_session(conn
);
1792 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1793 ret
= viewer_get_next_index(conn
);
1795 case LTTNG_VIEWER_GET_PACKET
:
1796 ret
= viewer_get_packet(conn
);
1798 case LTTNG_VIEWER_GET_METADATA
:
1799 ret
= viewer_get_metadata(conn
);
1801 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1802 ret
= viewer_get_new_streams(conn
);
1804 case LTTNG_VIEWER_CREATE_SESSION
:
1805 ret
= viewer_create_session(conn
);
1808 ERR("Received unknown viewer command (%u)",
1809 be32toh(recv_hdr
->cmd
));
1810 live_relay_unknown_command(conn
);
1820 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1824 (void) lttng_poll_del(events
, pollfd
);
1826 ret
= close(pollfd
);
1828 ERR("Closing pollfd %d", pollfd
);
1833 * This thread does the actual work
1836 void *thread_worker(void *data
)
1840 struct lttng_poll_event events
;
1841 struct lttng_ht
*viewer_connections_ht
;
1842 struct lttng_ht_iter iter
;
1843 struct lttng_viewer_cmd recv_hdr
;
1844 struct relay_connection
*destroy_conn
;
1846 DBG("[thread] Live viewer relay worker started");
1848 rcu_register_thread();
1850 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1852 if (testpoint(relayd_thread_live_worker
)) {
1853 goto error_testpoint
;
1856 /* table of connections indexed on socket */
1857 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1858 if (!viewer_connections_ht
) {
1859 goto viewer_connections_ht_error
;
1862 ret
= create_thread_poll_set(&events
, 2);
1864 goto error_poll_create
;
1867 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1876 health_code_update();
1878 /* Infinite blocking call, waiting for transmission */
1879 DBG3("Relayd live viewer worker thread polling...");
1880 health_poll_entry();
1881 ret
= lttng_poll_wait(&events
, -1);
1885 * Restart interrupted system call.
1887 if (errno
== EINTR
) {
1896 * Process control. The control connection is prioritised so we don't
1897 * starve it with high throughput tracing data on the data
1900 for (i
= 0; i
< nb_fd
; i
++) {
1901 /* Fetch once the poll data */
1902 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1903 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1905 health_code_update();
1908 /* No activity for this FD (poll implementation). */
1912 /* Thread quit pipe has been closed. Killing thread. */
1913 ret
= check_thread_quit_pipe(pollfd
, revents
);
1919 /* Inspect the relay conn pipe for new connection. */
1920 if (pollfd
== live_conn_pipe
[0]) {
1921 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1922 ERR("Relay live pipe error");
1924 } else if (revents
& LPOLLIN
) {
1925 struct relay_connection
*conn
;
1927 ret
= lttng_read(live_conn_pipe
[0],
1928 &conn
, sizeof(conn
));
1932 lttng_poll_add(&events
, conn
->sock
->fd
,
1933 LPOLLIN
| LPOLLRDHUP
);
1934 connection_ht_add(viewer_connections_ht
, conn
);
1935 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1938 /* Connection activity. */
1939 struct relay_connection
*conn
;
1941 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1946 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1947 cleanup_connection_pollfd(&events
, pollfd
);
1948 /* Put "create" ownership reference. */
1949 connection_put(conn
);
1950 } else if (revents
& LPOLLIN
) {
1951 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1952 sizeof(recv_hdr
), 0);
1954 /* Connection closed. */
1955 cleanup_connection_pollfd(&events
, pollfd
);
1956 /* Put "create" ownership reference. */
1957 connection_put(conn
);
1958 DBG("Viewer control conn closed with %d", pollfd
);
1960 ret
= process_control(&recv_hdr
, conn
);
1962 /* Clear the session on error. */
1963 cleanup_connection_pollfd(&events
, pollfd
);
1964 /* Put "create" ownership reference. */
1965 connection_put(conn
);
1966 DBG("Viewer connection closed with %d", pollfd
);
1970 /* Put local "get_by_sock" reference. */
1971 connection_put(conn
);
1978 lttng_poll_clean(&events
);
1980 /* Cleanup reamaining connection object. */
1982 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
1985 health_code_update();
1986 connection_put(destroy_conn
);
1990 lttng_ht_destroy(viewer_connections_ht
);
1991 viewer_connections_ht_error
:
1992 /* Close relay conn pipes */
1993 utils_close_pipe(live_conn_pipe
);
1995 DBG("Viewer worker thread exited with error");
1997 DBG("Viewer worker thread cleanup complete");
2001 ERR("Health error occurred in %s", __func__
);
2003 health_unregister(health_relayd
);
2004 if (lttng_relay_stop_threads()) {
2005 ERR("Error stopping threads");
2007 rcu_unregister_thread();
2012 * Create the relay command pipe to wake thread_manage_apps.
2013 * Closed in cleanup().
2015 static int create_conn_pipe(void)
2017 return utils_create_pipe_cloexec(live_conn_pipe
);
2020 int relayd_live_join(void)
2022 int ret
, retval
= 0;
2025 ret
= pthread_join(live_listener_thread
, &status
);
2028 PERROR("pthread_join live listener");
2032 ret
= pthread_join(live_worker_thread
, &status
);
2035 PERROR("pthread_join live worker");
2039 ret
= pthread_join(live_dispatcher_thread
, &status
);
2042 PERROR("pthread_join live dispatcher");
2046 cleanup_relayd_live();
2054 int relayd_live_create(struct lttng_uri
*uri
)
2056 int ret
= 0, retval
= 0;
2062 goto exit_init_data
;
2066 /* Check if daemon is UID = 0 */
2067 is_root
= !getuid();
2070 if (live_uri
->port
< 1024) {
2071 ERR("Need to be root to use ports < 1024");
2073 goto exit_init_data
;
2077 /* Setup the thread apps communication pipe. */
2078 if (create_conn_pipe()) {
2080 goto exit_init_data
;
2083 /* Init relay command queue. */
2084 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2086 /* Set up max poll set size */
2087 if (lttng_poll_set_max_size()) {
2089 goto exit_init_data
;
2092 /* Setup the dispatcher thread */
2093 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2094 thread_dispatcher
, (void *) NULL
);
2097 PERROR("pthread_create viewer dispatcher");
2099 goto exit_dispatcher_thread
;
2102 /* Setup the worker thread */
2103 ret
= pthread_create(&live_worker_thread
, NULL
,
2104 thread_worker
, NULL
);
2107 PERROR("pthread_create viewer worker");
2109 goto exit_worker_thread
;
2112 /* Setup the listener thread */
2113 ret
= pthread_create(&live_listener_thread
, NULL
,
2114 thread_listener
, (void *) NULL
);
2117 PERROR("pthread_create viewer listener");
2119 goto exit_listener_thread
;
2123 * All OK, started all threads.
2128 * Join on the live_listener_thread should anything be added after
2129 * the live_listener thread's creation.
2132 exit_listener_thread
:
2134 ret
= pthread_join(live_worker_thread
, &status
);
2137 PERROR("pthread_join live worker");
2142 ret
= pthread_join(live_dispatcher_thread
, &status
);
2145 PERROR("pthread_join live dispatcher");
2148 exit_dispatcher_thread
:
2151 cleanup_relayd_live();