2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
37 #include <urcu/futex.h>
38 #include <urcu/uatomic.h>
39 #include <urcu/rculist.h>
44 #include <lttng/lttng.h>
45 #include <common/common.h>
46 #include <common/compat/poll.h>
47 #include <common/compat/socket.h>
48 #include <common/compat/endian.h>
49 #include <common/defaults.h>
50 #include <common/futex.h>
51 #include <common/index/index.h>
52 #include <common/sessiond-comm/sessiond-comm.h>
53 #include <common/sessiond-comm/inet.h>
54 #include <common/sessiond-comm/relayd.h>
55 #include <common/uri.h>
56 #include <common/utils.h>
60 #include "lttng-relayd.h"
62 #include "health-relayd.h"
63 #include "testpoint.h"
64 #include "viewer-stream.h"
67 #include "ctf-trace.h"
68 #include "connection.h"
69 #include "viewer-session.h"
71 #define SESSION_BUF_DEFAULT_COUNT 16
73 static struct lttng_uri
*live_uri
;
76 * This pipe is used to inform the worker thread that a command is queued and
77 * ready to be processed.
79 static int live_conn_pipe
[2] = { -1, -1 };
81 /* Shared between threads */
82 static int live_dispatch_thread_exit
;
84 static pthread_t live_listener_thread
;
85 static pthread_t live_dispatcher_thread
;
86 static pthread_t live_worker_thread
;
89 * Relay command queue.
91 * The live_thread_listener and live_thread_dispatcher communicate with this
94 static struct relay_conn_queue viewer_conn_queue
;
96 static uint64_t last_relay_viewer_session_id
;
97 static pthread_mutex_t last_relay_viewer_session_id_lock
=
98 PTHREAD_MUTEX_INITIALIZER
;
104 void cleanup_relayd_live(void)
112 * Receive a request buffer using a given socket, destination allocated buffer
115 * Return the size of the received message or else a negative value on error
116 * with errno being set by recvmsg() syscall.
119 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
123 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
124 if (ret
< 0 || ret
!= size
) {
126 /* Orderly shutdown. Not necessary to print an error. */
127 DBG("Socket %d did an orderly shutdown", sock
->fd
);
129 ERR("Relay failed to receive request.");
138 * Send a response buffer using a given socket, source allocated buffer of
141 * Return the size of the sent message or else a negative value on error with
142 * errno being set by sendmsg() syscall.
145 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
149 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
151 ERR("Relayd failed to send response.");
158 * Atomically check if new streams got added in one of the sessions attached
159 * and reset the flag to 0.
161 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
165 int check_new_streams(struct relay_connection
*conn
)
167 struct relay_session
*session
;
168 unsigned long current_val
;
171 if (!conn
->viewer_session
) {
175 cds_list_for_each_entry_rcu(session
,
176 &conn
->viewer_session
->session_list
,
177 viewer_session_node
) {
178 if (!session_get(session
)) {
181 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
183 session_put(session
);
194 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
195 * this function should ignore the sent flag or not.
197 * Return 0 on success or else a negative value.
200 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
201 struct relay_session
*session
, unsigned int ignore_sent_flag
)
204 struct lttng_viewer_stream send_stream
;
205 struct lttng_ht_iter iter
;
206 struct relay_viewer_stream
*vstream
;
210 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
212 struct ctf_trace
*ctf_trace
;
214 health_code_update();
216 if (!viewer_stream_get(vstream
)) {
220 pthread_mutex_lock(&vstream
->stream
->lock
);
221 /* Ignore if not the same session. */
222 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
223 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
224 pthread_mutex_unlock(&vstream
->stream
->lock
);
225 viewer_stream_put(vstream
);
229 ctf_trace
= vstream
->stream
->trace
;
230 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
231 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
232 send_stream
.metadata_flag
= htobe32(
233 vstream
->stream
->is_metadata
);
234 strncpy(send_stream
.path_name
, vstream
->path_name
,
235 sizeof(send_stream
.path_name
));
236 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
237 sizeof(send_stream
.channel_name
));
239 DBG("Sending stream %" PRIu64
" to viewer",
240 vstream
->stream
->stream_handle
);
241 vstream
->sent_flag
= 1;
242 pthread_mutex_unlock(&vstream
->stream
->lock
);
244 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
245 viewer_stream_put(vstream
);
259 * Create every viewer stream possible for the given session with the seek
260 * type. Three counters *can* be return which are in order the total amount of
261 * viewer stream of the session, the number of unsent stream and the number of
262 * stream created. Those counters can be NULL and thus will be ignored.
264 * Return 0 on success or else a negative value.
267 int make_viewer_streams(struct relay_session
*session
,
268 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
269 uint32_t *nb_created
)
272 struct lttng_ht_iter iter
;
273 struct ctf_trace
*ctf_trace
;
278 * Hold the session lock to ensure that we see either none or
279 * all initial streams for a session, but no intermediate state.
281 pthread_mutex_lock(&session
->lock
);
284 * Create viewer streams for relay streams that are ready to be
285 * used for a the given session id only.
288 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
290 struct relay_stream
*stream
;
292 health_code_update();
294 if (!ctf_trace_get(ctf_trace
)) {
298 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
299 struct relay_viewer_stream
*vstream
;
301 if (!stream_get(stream
)) {
305 * stream published is protected by the session
308 if (!stream
->published
) {
311 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
313 vstream
= viewer_stream_create(stream
, seek_t
);
316 ctf_trace_put(ctf_trace
);
322 /* Update number of created stream counter. */
326 if (!vstream
->sent_flag
&& nb_unsent
) {
327 /* Update number of unsent stream counter. */
330 viewer_stream_put(vstream
);
332 /* Update number of total stream counter. */
339 ctf_trace_put(ctf_trace
);
346 pthread_mutex_unlock(&session
->lock
);
350 int relayd_live_stop(void)
352 /* Stop dispatch thread */
353 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
354 futex_nto1_wake(&viewer_conn_queue
.futex
);
359 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
362 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
366 if (events
== NULL
|| size
== 0) {
371 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
377 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
389 * Check if the thread quit pipe was triggered.
391 * Return 1 if it was triggered else 0;
394 int check_thread_quit_pipe(int fd
, uint32_t events
)
396 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
404 * Create and init socket from uri.
407 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
410 struct lttcomm_sock
*sock
= NULL
;
412 sock
= lttcomm_alloc_sock_from_uri(uri
);
414 ERR("Allocating socket");
418 ret
= lttcomm_create_sock(sock
);
422 DBG("Listening on sock %d for live", sock
->fd
);
424 ret
= sock
->ops
->bind(sock
);
429 ret
= sock
->ops
->listen(sock
, -1);
439 lttcomm_destroy_sock(sock
);
445 * This thread manages the listening for new connections on the network
448 void *thread_listener(void *data
)
450 int i
, ret
, pollfd
, err
= -1;
451 uint32_t revents
, nb_fd
;
452 struct lttng_poll_event events
;
453 struct lttcomm_sock
*live_control_sock
;
455 DBG("[thread] Relay live listener started");
457 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
459 health_code_update();
461 live_control_sock
= init_socket(live_uri
);
462 if (!live_control_sock
) {
463 goto error_sock_control
;
466 /* Pass 2 as size here for the thread quit pipe and control sockets. */
467 ret
= create_thread_poll_set(&events
, 2);
469 goto error_create_poll
;
472 /* Add the control socket */
473 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
478 lttng_relay_notify_ready();
480 if (testpoint(relayd_thread_live_listener
)) {
481 goto error_testpoint
;
485 health_code_update();
487 DBG("Listener accepting live viewers connections");
491 ret
= lttng_poll_wait(&events
, -1);
495 * Restart interrupted system call.
497 if (errno
== EINTR
) {
504 DBG("Relay new viewer connection received");
505 for (i
= 0; i
< nb_fd
; i
++) {
506 health_code_update();
508 /* Fetch once the poll data */
509 revents
= LTTNG_POLL_GETEV(&events
, i
);
510 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
513 /* No activity for this FD (poll implementation). */
517 /* Thread quit pipe has been closed. Killing thread. */
518 ret
= check_thread_quit_pipe(pollfd
, revents
);
524 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
525 ERR("socket poll error");
527 } else if (revents
& LPOLLIN
) {
529 * A new connection is requested, therefore a
530 * viewer connection is allocated in this
531 * thread, enqueued to a global queue and
532 * dequeued (and freed) in the worker thread.
535 struct relay_connection
*new_conn
;
536 struct lttcomm_sock
*newsock
;
538 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
540 PERROR("accepting control sock");
543 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
545 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
548 PERROR("setsockopt inet");
549 lttcomm_destroy_sock(newsock
);
552 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
554 lttcomm_destroy_sock(newsock
);
557 /* Ownership assumed by the connection. */
560 /* Enqueue request for the dispatcher thread. */
561 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
565 * Wake the dispatch queue futex.
566 * Implicit memory barrier with the
567 * exchange in cds_wfcq_enqueue.
569 futex_nto1_wake(&viewer_conn_queue
.futex
);
578 lttng_poll_clean(&events
);
580 if (live_control_sock
->fd
>= 0) {
581 ret
= live_control_sock
->ops
->close(live_control_sock
);
586 lttcomm_destroy_sock(live_control_sock
);
590 DBG("Live viewer listener thread exited with error");
592 health_unregister(health_relayd
);
593 DBG("Live viewer listener thread cleanup complete");
594 if (lttng_relay_stop_threads()) {
595 ERR("Error stopping threads");
601 * This thread manages the dispatching of the requests to worker threads
604 void *thread_dispatcher(void *data
)
608 struct cds_wfcq_node
*node
;
609 struct relay_connection
*conn
= NULL
;
611 DBG("[thread] Live viewer relay dispatcher started");
613 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
615 if (testpoint(relayd_thread_live_dispatcher
)) {
616 goto error_testpoint
;
619 health_code_update();
621 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
622 health_code_update();
624 /* Atomically prepare the queue futex */
625 futex_nto1_prepare(&viewer_conn_queue
.futex
);
628 health_code_update();
630 /* Dequeue commands */
631 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
632 &viewer_conn_queue
.tail
);
634 DBG("Woken up but nothing in the live-viewer "
635 "relay command queue");
636 /* Continue thread execution */
639 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
640 DBG("Dispatching viewer request waiting on sock %d",
644 * Inform worker thread of the new request. This
645 * call is blocking so we can be assured that
646 * the data will be read at some point in time
647 * or wait to the end of the world :)
649 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
651 PERROR("write conn pipe");
652 connection_put(conn
);
655 } while (node
!= NULL
);
657 /* Futex wait on queue. Blocking call on futex() */
659 futex_nto1_wait(&viewer_conn_queue
.futex
);
663 /* Normal exit, no error */
670 ERR("Health error occurred in %s", __func__
);
672 health_unregister(health_relayd
);
673 DBG("Live viewer dispatch thread dying");
674 if (lttng_relay_stop_threads()) {
675 ERR("Error stopping threads");
681 * Establish connection with the viewer and check the versions.
683 * Return 0 on success or else negative value.
686 int viewer_connect(struct relay_connection
*conn
)
689 struct lttng_viewer_connect reply
, msg
;
691 conn
->version_check_done
= 1;
693 health_code_update();
695 DBG("Viewer is establishing a connection to the relayd.");
697 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
702 health_code_update();
704 memset(&reply
, 0, sizeof(reply
));
705 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
706 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
708 /* Major versions must be the same */
709 if (reply
.major
!= be32toh(msg
.major
)) {
710 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
711 reply
.major
, be32toh(msg
.major
));
716 conn
->major
= reply
.major
;
717 /* We adapt to the lowest compatible version */
718 if (reply
.minor
<= be32toh(msg
.minor
)) {
719 conn
->minor
= reply
.minor
;
721 conn
->minor
= be32toh(msg
.minor
);
724 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
725 conn
->type
= RELAY_VIEWER_COMMAND
;
726 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
727 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
729 ERR("Unknown connection type : %u", be32toh(msg
.type
));
734 reply
.major
= htobe32(reply
.major
);
735 reply
.minor
= htobe32(reply
.minor
);
736 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
738 * Increment outside of htobe64 macro, because the argument can
739 * be used more than once within the macro, and thus the
740 * operation may be undefined.
742 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
743 last_relay_viewer_session_id
++;
744 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
745 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
748 health_code_update();
750 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
755 health_code_update();
757 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
765 * Send the viewer the list of current sessions.
766 * We need to create a copy of the hash table content because otherwise
767 * we cannot assume the number of entries stays the same between getting
768 * the number of HT elements and iteration over the HT.
770 * Return 0 on success or else a negative value.
773 int viewer_list_sessions(struct relay_connection
*conn
)
776 struct lttng_viewer_list_sessions session_list
;
777 struct lttng_ht_iter iter
;
778 struct relay_session
*session
;
779 struct lttng_viewer_session
*send_session_buf
= NULL
;
780 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
783 DBG("List sessions received");
785 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
786 if (!send_session_buf
) {
791 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
793 struct lttng_viewer_session
*send_session
;
795 health_code_update();
797 if (count
>= buf_count
) {
798 struct lttng_viewer_session
*newbuf
;
799 uint32_t new_buf_count
= buf_count
<< 1;
801 newbuf
= realloc(send_session_buf
,
802 new_buf_count
* sizeof(*send_session_buf
));
808 send_session_buf
= newbuf
;
809 buf_count
= new_buf_count
;
811 send_session
= &send_session_buf
[count
];
812 strncpy(send_session
->session_name
, session
->session_name
,
813 sizeof(send_session
->session_name
));
814 strncpy(send_session
->hostname
, session
->hostname
,
815 sizeof(send_session
->hostname
));
816 send_session
->id
= htobe64(session
->id
);
817 send_session
->live_timer
= htobe32(session
->live_timer
);
818 if (session
->viewer_attached
) {
819 send_session
->clients
= htobe32(1);
821 send_session
->clients
= htobe32(0);
823 send_session
->streams
= htobe32(session
->stream_count
);
828 session_list
.sessions_count
= htobe32(count
);
830 health_code_update();
832 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
837 health_code_update();
839 ret
= send_response(conn
->sock
, send_session_buf
,
840 count
* sizeof(*send_session_buf
));
844 health_code_update();
848 free(send_session_buf
);
853 * Send the viewer the list of current streams.
856 int viewer_get_new_streams(struct relay_connection
*conn
)
858 int ret
, send_streams
= 0;
859 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
860 struct lttng_viewer_new_streams_request request
;
861 struct lttng_viewer_new_streams_response response
;
862 struct relay_session
*session
;
867 DBG("Get new streams received");
869 health_code_update();
871 /* Receive the request from the connected client. */
872 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
876 session_id
= be64toh(request
.session_id
);
878 health_code_update();
880 memset(&response
, 0, sizeof(response
));
882 session
= session_get_by_id(session_id
);
884 DBG("Relay session %" PRIu64
" not found", session_id
);
885 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
889 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
891 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
896 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
898 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
901 goto end_put_session
;
903 /* Only send back the newly created streams with the unsent ones. */
904 nb_streams
= nb_created
+ nb_unsent
;
905 response
.streams_count
= htobe32(nb_streams
);
908 * If the session is closed and we have no new streams to send,
909 * it means that the viewer has already received the whole trace
910 * for this session and should now close it.
912 if (nb_total
== 0 && session
->connection_closed
) {
914 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
919 health_code_update();
920 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
922 goto end_put_session
;
924 health_code_update();
927 * Unknown or empty session, just return gracefully, the viewer
928 * knows what is happening.
930 if (!send_streams
|| !nb_streams
) {
932 goto end_put_session
;
936 * Send stream and *DON'T* ignore the sent flag so every viewer
937 * streams that were not sent from that point will be sent to
940 ret
= send_viewer_streams(conn
->sock
, session
, 0);
942 goto end_put_session
;
947 session_put(session
);
954 * Send the viewer the list of current sessions.
957 int viewer_attach_session(struct relay_connection
*conn
)
959 int send_streams
= 0;
961 uint32_t nb_streams
= 0;
962 enum lttng_viewer_seek seek_type
;
963 struct lttng_viewer_attach_session_request request
;
964 struct lttng_viewer_attach_session_response response
;
965 struct relay_session
*session
= NULL
;
969 health_code_update();
971 /* Receive the request from the connected client. */
972 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
977 health_code_update();
979 memset(&response
, 0, sizeof(response
));
981 if (!conn
->viewer_session
) {
982 DBG("Client trying to attach before creating a live viewer session");
983 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
987 session
= session_get_by_id(be64toh(request
.session_id
));
989 DBG("Relay session %" PRIu64
" not found",
990 be64toh(request
.session_id
));
991 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
994 DBG("Attach session ID %" PRIu64
" received",
995 be64toh(request
.session_id
));
997 if (session
->live_timer
== 0) {
998 DBG("Not live session");
999 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1004 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1006 DBG("Already a viewer attached");
1007 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1011 switch (be32toh(request
.seek
)) {
1012 case LTTNG_VIEWER_SEEK_BEGINNING
:
1013 case LTTNG_VIEWER_SEEK_LAST
:
1014 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1015 seek_type
= be32toh(request
.seek
);
1018 ERR("Wrong seek parameter");
1019 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1024 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
, NULL
);
1026 goto end_put_session
;
1028 response
.streams_count
= htobe32(nb_streams
);
1031 health_code_update();
1032 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1034 goto end_put_session
;
1036 health_code_update();
1039 * Unknown or empty session, just return gracefully, the viewer
1040 * knows what is happening.
1042 if (!send_streams
|| !nb_streams
) {
1044 goto end_put_session
;
1047 /* Send stream and ignore the sent flag. */
1048 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1050 goto end_put_session
;
1055 session_put(session
);
1062 * Open the index file if needed for the given vstream.
1064 * If an index file is successfully opened, the vstream index_fd set with
1067 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1069 * Called with rstream lock held.
1071 static int try_open_index(struct relay_viewer_stream
*vstream
,
1072 struct relay_stream
*rstream
)
1076 if (vstream
->index_fd
) {
1081 * First time, we open the index file and at least one index is ready.
1083 if (rstream
->total_index_received
== 0) {
1087 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1088 vstream
->stream
->tracefile_count
,
1089 vstream
->current_tracefile_id
);
1091 vstream
->index_fd
= stream_fd_create(ret
);
1092 if (!vstream
->index_fd
) {
1108 * Check the status of the index for the given stream. This function
1109 * updates the index structure if needed and can put (close) the vstream
1110 * in the HUP situation.
1112 * Return 0 means that we can proceed with the index. A value of 1 means
1113 * that the index has been updated and is ready to be sent to the
1114 * client. A negative value indicates an error that can't be handled.
1116 * Called with rstream lock held.
1118 static int check_index_status(struct relay_viewer_stream
*vstream
,
1119 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1120 struct lttng_viewer_index
*index
)
1124 if (trace
->session
->connection_closed
1125 && rstream
->total_index_received
1126 == vstream
->last_sent_index
) {
1127 /* Last index sent and session connection is closed. */
1128 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1130 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1131 rstream
->total_index_received
1132 == vstream
->last_sent_index
) {
1134 * We've received a synchronization beacon and the last index
1135 * available has been sent, the index for now is inactive.
1137 * In this case, we have received a beacon which allows us to
1138 * inform the client of a time interval during which we can
1139 * guarantee that there are no events to read (and never will
1142 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1143 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1144 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1146 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
) {
1148 * This actually checks the case where recv == last_sent.
1149 * In this case, we have not received a beacon. Therefore, we
1150 * can only ask the client to retry later.
1152 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1154 } else if (!viewer_stream_is_tracefile_seq_readable(vstream
,
1155 vstream
->current_tracefile_seq
)) {
1157 * The producer has overwritten our current file. We
1160 DBG("Viewer stream %" PRIu64
" rotation due to overwrite",
1161 vstream
->stream
->stream_handle
);
1162 ret
= viewer_stream_rotate(vstream
);
1165 } else if (ret
== 1) {
1166 /* EOF across entire stream. */
1167 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1170 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1171 vstream
->current_tracefile_seq
));
1172 /* ret == 0 means successful so we continue. */
1179 * Use EOF on current index file to find out when we
1182 read_ret
= lttng_read(vstream
->index_fd
->fd
, tmp
, 1);
1183 if (read_ret
== 1) {
1186 /* There is still data to read. Rewind position. */
1187 seek_ret
= lseek(vstream
->index_fd
->fd
, -1, SEEK_CUR
);
1193 } else if (read_ret
== 0) {
1194 /* EOF. We need to rotate. */
1195 DBG("Viewer stream %" PRIu64
" rotation due to EOF",
1196 vstream
->stream
->stream_handle
);
1197 ret
= viewer_stream_rotate(vstream
);
1200 } else if (ret
== 1) {
1201 /* EOF across entire stream. */
1202 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1205 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1206 vstream
->current_tracefile_seq
));
1207 /* ret == 0 means successful so we continue. */
1210 /* Error reading index. */
1218 viewer_stream_put(vstream
);
1224 * Send the next index for a stream.
1226 * Return 0 on success or else a negative value.
1229 int viewer_get_next_index(struct relay_connection
*conn
)
1233 struct lttng_viewer_get_next_index request_index
;
1234 struct lttng_viewer_index viewer_index
;
1235 struct ctf_packet_index packet_index
;
1236 struct relay_viewer_stream
*vstream
= NULL
;
1237 struct relay_stream
*rstream
= NULL
;
1238 struct ctf_trace
*ctf_trace
= NULL
;
1239 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1243 DBG("Viewer get next index");
1245 memset(&viewer_index
, 0, sizeof(viewer_index
));
1246 health_code_update();
1248 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1252 health_code_update();
1254 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1260 /* Use back. ref. Protected by refcounts. */
1261 rstream
= vstream
->stream
;
1262 ctf_trace
= rstream
->trace
;
1264 /* metadata_viewer_stream may be NULL. */
1265 metadata_viewer_stream
=
1266 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1268 pthread_mutex_lock(&rstream
->lock
);
1271 * The viewer should not ask for index on metadata stream.
1273 if (rstream
->is_metadata
) {
1274 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1278 /* Try to open an index if one is needed for that stream. */
1279 ret
= try_open_index(vstream
, rstream
);
1281 if (ret
== -ENOENT
) {
1283 * The index is created only when the first data
1284 * packet arrives, it might not be ready at the
1285 * beginning of the session
1287 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1289 /* Unhandled error. */
1290 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1295 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1298 } else if (ret
== 1) {
1300 * We have no index to send and check_index_status has populated
1301 * viewer_index's status.
1305 /* At this point, ret is 0 thus we will be able to read the index. */
1309 * vstream->stream_fd may be NULL if it has been closed by
1310 * tracefile rotation, or if we are at the beginning of the
1311 * stream. We open the data stream file here to protect against
1312 * overwrite caused by tracefile rotation (in association with
1313 * unlink performed before overwrite).
1315 if (!vstream
->stream_fd
) {
1316 char fullpath
[PATH_MAX
];
1318 if (vstream
->stream
->tracefile_count
> 0) {
1319 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1321 vstream
->channel_name
,
1322 vstream
->current_tracefile_id
);
1324 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1326 vstream
->channel_name
);
1331 ret
= open(fullpath
, O_RDONLY
);
1333 PERROR("Relay opening trace file");
1336 vstream
->stream_fd
= stream_fd_create(ret
);
1337 if (!vstream
->stream_fd
) {
1345 ret
= check_new_streams(conn
);
1347 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1349 } else if (ret
== 1) {
1350 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1353 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1354 sizeof(packet_index
));
1355 if (read_ret
< sizeof(packet_index
)) {
1356 ERR("Relay reading index file %d returned %zd",
1357 vstream
->index_fd
->fd
, read_ret
);
1358 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1361 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1362 vstream
->last_sent_index
++;
1366 * Indexes are stored in big endian, no need to switch before sending.
1368 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1369 rstream
->stream_handle
,
1370 be64toh(packet_index
.offset
));
1371 viewer_index
.offset
= packet_index
.offset
;
1372 viewer_index
.packet_size
= packet_index
.packet_size
;
1373 viewer_index
.content_size
= packet_index
.content_size
;
1374 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1375 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1376 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1377 viewer_index
.stream_id
= packet_index
.stream_id
;
1380 pthread_mutex_unlock(&rstream
->lock
);
1382 if (metadata_viewer_stream
) {
1383 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1384 DBG("get next index metadata check: recv %" PRIu64
1386 metadata_viewer_stream
->stream
->metadata_received
,
1387 metadata_viewer_stream
->metadata_sent
);
1388 if (!metadata_viewer_stream
->stream
->metadata_received
||
1389 metadata_viewer_stream
->stream
->metadata_received
>
1390 metadata_viewer_stream
->metadata_sent
) {
1391 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1393 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1396 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1397 health_code_update();
1399 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1403 health_code_update();
1405 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1406 vstream
->last_sent_index
,
1407 vstream
->stream
->stream_handle
);
1409 if (metadata_viewer_stream
) {
1410 viewer_stream_put(metadata_viewer_stream
);
1413 viewer_stream_put(vstream
);
1418 pthread_mutex_unlock(&rstream
->lock
);
1419 if (metadata_viewer_stream
) {
1420 viewer_stream_put(metadata_viewer_stream
);
1422 viewer_stream_put(vstream
);
1427 * Send the next index for a stream
1429 * Return 0 on success or else a negative value.
1432 int viewer_get_packet(struct relay_connection
*conn
)
1434 int ret
, send_data
= 0;
1438 struct lttng_viewer_get_packet get_packet_info
;
1439 struct lttng_viewer_trace_packet reply
;
1440 struct relay_viewer_stream
*vstream
= NULL
;
1441 struct ctf_trace
*ctf_trace
;
1442 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1444 DBG2("Relay get data packet");
1446 health_code_update();
1448 ret
= recv_request(conn
->sock
, &get_packet_info
,
1449 sizeof(get_packet_info
));
1453 health_code_update();
1455 /* From this point on, the error label can be reached. */
1456 memset(&reply
, 0, sizeof(reply
));
1458 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1463 ctf_trace
= vstream
->stream
->trace
;
1465 /* metadata_viewer_stream may be NULL. */
1466 metadata_viewer_stream
=
1467 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1469 if (metadata_viewer_stream
) {
1470 bool get_packet_err
= false;
1472 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1473 DBG("get packet metadata check: recv %" PRIu64
" sent %" PRIu64
,
1474 metadata_viewer_stream
->stream
->metadata_received
,
1475 metadata_viewer_stream
->metadata_sent
);
1476 if (!metadata_viewer_stream
->stream
->metadata_received
||
1477 metadata_viewer_stream
->stream
->metadata_received
>
1478 metadata_viewer_stream
->metadata_sent
) {
1480 * We prevent the client from reading a data stream as
1481 * long as there is metadata left to consume. This
1482 * ensures that the client won't receive data of which
1483 * it can't make sense.
1485 get_packet_err
= true;
1487 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1488 viewer_stream_put(metadata_viewer_stream
);
1489 if (get_packet_err
) {
1490 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1491 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1492 goto send_reply_nolock
;
1496 pthread_mutex_lock(&vstream
->stream
->lock
);
1498 * The vstream->stream_fd used here has been opened by
1499 * get_next_index. It is opened there because this is what
1500 * allows us to grab a reference to the file with stream lock
1501 * held, thus protecting us against overwrite caused by
1502 * tracefile rotation. Since tracefile rotation unlinks the old
1503 * data file, we are ensured that we won't have our data
1504 * overwritten under us.
1506 ret
= check_new_streams(conn
);
1509 } else if (ret
== 1) {
1510 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1511 reply
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1515 len
= be32toh(get_packet_info
.len
);
1516 data
= zmalloc(len
);
1518 PERROR("relay data zmalloc");
1522 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1525 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1526 be64toh(get_packet_info
.offset
));
1529 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1530 if (read_len
< len
) {
1531 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1532 vstream
->stream_fd
->fd
,
1533 be64toh(get_packet_info
.offset
));
1536 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1537 reply
.len
= htobe32(len
);
1542 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1546 pthread_mutex_unlock(&vstream
->stream
->lock
);
1549 reply
.flags
= htobe32(reply
.flags
);
1551 health_code_update();
1553 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1557 health_code_update();
1560 health_code_update();
1561 ret
= send_response(conn
->sock
, data
, len
);
1565 health_code_update();
1568 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1569 be64toh(get_packet_info
.stream_id
));
1575 viewer_stream_put(vstream
);
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
*vstream
= NULL
;
1598 DBG("Relay get metadata");
1600 health_code_update();
1602 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1606 health_code_update();
1608 memset(&reply
, 0, sizeof(reply
));
1610 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1612 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1615 pthread_mutex_lock(&vstream
->stream
->lock
);
1616 if (!vstream
->stream
->is_metadata
) {
1617 ERR("Invalid metadata stream");
1621 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1623 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1625 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1629 /* first time, we open the metadata file */
1630 if (!vstream
->stream_fd
) {
1631 char fullpath
[PATH_MAX
];
1633 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1634 vstream
->channel_name
);
1638 ret
= open(fullpath
, O_RDONLY
);
1640 PERROR("Relay opening metadata file");
1643 vstream
->stream_fd
= stream_fd_create(ret
);
1644 if (!vstream
->stream_fd
) {
1652 reply
.len
= htobe64(len
);
1653 data
= zmalloc(len
);
1655 PERROR("viewer metadata zmalloc");
1659 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1660 if (read_len
< len
) {
1661 PERROR("Relay reading metadata file");
1664 vstream
->metadata_sent
+= read_len
;
1665 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1666 && vstream
->stream
->closed
) {
1667 /* Release ownership for the viewer metadata stream. */
1668 viewer_stream_put(vstream
);
1671 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1676 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1679 health_code_update();
1681 pthread_mutex_unlock(&vstream
->stream
->lock
);
1683 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1687 health_code_update();
1690 ret
= send_response(conn
->sock
, data
, len
);
1696 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1697 be64toh(request
.stream_id
));
1699 DBG("Metadata sent");
1705 viewer_stream_put(vstream
);
1711 * Create a viewer session.
1713 * Return 0 on success or else a negative value.
1716 int viewer_create_session(struct relay_connection
*conn
)
1719 struct lttng_viewer_create_session_response resp
;
1721 DBG("Viewer create session received");
1723 memset(&resp
, 0, sizeof(resp
));
1724 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1725 conn
->viewer_session
= viewer_session_create();
1726 if (!conn
->viewer_session
) {
1727 ERR("Allocation viewer session");
1728 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1733 health_code_update();
1734 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1738 health_code_update();
1747 * live_relay_unknown_command: send -1 if received unknown command
1750 void live_relay_unknown_command(struct relay_connection
*conn
)
1752 struct lttcomm_relayd_generic_reply reply
;
1754 memset(&reply
, 0, sizeof(reply
));
1755 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1756 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1760 * Process the commands received on the control socket
1763 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1764 struct relay_connection
*conn
)
1769 msg_value
= be32toh(recv_hdr
->cmd
);
1772 * Make sure we've done the version check before any command other then a
1773 * new client connection.
1775 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1776 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1781 switch (msg_value
) {
1782 case LTTNG_VIEWER_CONNECT
:
1783 ret
= viewer_connect(conn
);
1785 case LTTNG_VIEWER_LIST_SESSIONS
:
1786 ret
= viewer_list_sessions(conn
);
1788 case LTTNG_VIEWER_ATTACH_SESSION
:
1789 ret
= viewer_attach_session(conn
);
1791 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1792 ret
= viewer_get_next_index(conn
);
1794 case LTTNG_VIEWER_GET_PACKET
:
1795 ret
= viewer_get_packet(conn
);
1797 case LTTNG_VIEWER_GET_METADATA
:
1798 ret
= viewer_get_metadata(conn
);
1800 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1801 ret
= viewer_get_new_streams(conn
);
1803 case LTTNG_VIEWER_CREATE_SESSION
:
1804 ret
= viewer_create_session(conn
);
1807 ERR("Received unknown viewer command (%u)",
1808 be32toh(recv_hdr
->cmd
));
1809 live_relay_unknown_command(conn
);
1819 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1823 (void) lttng_poll_del(events
, pollfd
);
1825 ret
= close(pollfd
);
1827 ERR("Closing pollfd %d", pollfd
);
1832 * This thread does the actual work
1835 void *thread_worker(void *data
)
1839 struct lttng_poll_event events
;
1840 struct lttng_ht
*viewer_connections_ht
;
1841 struct lttng_ht_iter iter
;
1842 struct lttng_viewer_cmd recv_hdr
;
1843 struct relay_connection
*destroy_conn
;
1845 DBG("[thread] Live viewer relay worker started");
1847 rcu_register_thread();
1849 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1851 if (testpoint(relayd_thread_live_worker
)) {
1852 goto error_testpoint
;
1855 /* table of connections indexed on socket */
1856 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1857 if (!viewer_connections_ht
) {
1858 goto viewer_connections_ht_error
;
1861 ret
= create_thread_poll_set(&events
, 2);
1863 goto error_poll_create
;
1866 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1875 health_code_update();
1877 /* Infinite blocking call, waiting for transmission */
1878 DBG3("Relayd live viewer worker thread polling...");
1879 health_poll_entry();
1880 ret
= lttng_poll_wait(&events
, -1);
1884 * Restart interrupted system call.
1886 if (errno
== EINTR
) {
1895 * Process control. The control connection is prioritised so we don't
1896 * starve it with high throughput tracing data on the data
1899 for (i
= 0; i
< nb_fd
; i
++) {
1900 /* Fetch once the poll data */
1901 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1902 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1904 health_code_update();
1907 /* No activity for this FD (poll implementation). */
1911 /* Thread quit pipe has been closed. Killing thread. */
1912 ret
= check_thread_quit_pipe(pollfd
, revents
);
1918 /* Inspect the relay conn pipe for new connection. */
1919 if (pollfd
== live_conn_pipe
[0]) {
1920 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1921 ERR("Relay live pipe error");
1923 } else if (revents
& LPOLLIN
) {
1924 struct relay_connection
*conn
;
1926 ret
= lttng_read(live_conn_pipe
[0],
1927 &conn
, sizeof(conn
));
1931 lttng_poll_add(&events
, conn
->sock
->fd
,
1932 LPOLLIN
| LPOLLRDHUP
);
1933 connection_ht_add(viewer_connections_ht
, conn
);
1934 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1937 /* Connection activity. */
1938 struct relay_connection
*conn
;
1940 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1945 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1946 cleanup_connection_pollfd(&events
, pollfd
);
1947 /* Put "create" ownership reference. */
1948 connection_put(conn
);
1949 } else if (revents
& LPOLLIN
) {
1950 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1951 sizeof(recv_hdr
), 0);
1953 /* Connection closed. */
1954 cleanup_connection_pollfd(&events
, pollfd
);
1955 /* Put "create" ownership reference. */
1956 connection_put(conn
);
1957 DBG("Viewer control conn closed with %d", pollfd
);
1959 ret
= process_control(&recv_hdr
, conn
);
1961 /* Clear the session on error. */
1962 cleanup_connection_pollfd(&events
, pollfd
);
1963 /* Put "create" ownership reference. */
1964 connection_put(conn
);
1965 DBG("Viewer connection closed with %d", pollfd
);
1969 /* Put local "get_by_sock" reference. */
1970 connection_put(conn
);
1977 lttng_poll_clean(&events
);
1979 /* Cleanup reamaining connection object. */
1981 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
1984 health_code_update();
1985 connection_put(destroy_conn
);
1989 lttng_ht_destroy(viewer_connections_ht
);
1990 viewer_connections_ht_error
:
1991 /* Close relay conn pipes */
1992 utils_close_pipe(live_conn_pipe
);
1994 DBG("Viewer worker thread exited with error");
1996 DBG("Viewer worker thread cleanup complete");
2000 ERR("Health error occurred in %s", __func__
);
2002 health_unregister(health_relayd
);
2003 if (lttng_relay_stop_threads()) {
2004 ERR("Error stopping threads");
2006 rcu_unregister_thread();
2011 * Create the relay command pipe to wake thread_manage_apps.
2012 * Closed in cleanup().
2014 static int create_conn_pipe(void)
2016 return utils_create_pipe_cloexec(live_conn_pipe
);
2019 int relayd_live_join(void)
2021 int ret
, retval
= 0;
2024 ret
= pthread_join(live_listener_thread
, &status
);
2027 PERROR("pthread_join live listener");
2031 ret
= pthread_join(live_worker_thread
, &status
);
2034 PERROR("pthread_join live worker");
2038 ret
= pthread_join(live_dispatcher_thread
, &status
);
2041 PERROR("pthread_join live dispatcher");
2045 cleanup_relayd_live();
2053 int relayd_live_create(struct lttng_uri
*uri
)
2055 int ret
= 0, retval
= 0;
2061 goto exit_init_data
;
2065 /* Check if daemon is UID = 0 */
2066 is_root
= !getuid();
2069 if (live_uri
->port
< 1024) {
2070 ERR("Need to be root to use ports < 1024");
2072 goto exit_init_data
;
2076 /* Setup the thread apps communication pipe. */
2077 if (create_conn_pipe()) {
2079 goto exit_init_data
;
2082 /* Init relay command queue. */
2083 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2085 /* Set up max poll set size */
2086 lttng_poll_set_max_size();
2088 /* Setup the dispatcher thread */
2089 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2090 thread_dispatcher
, (void *) NULL
);
2093 PERROR("pthread_create viewer dispatcher");
2095 goto exit_dispatcher_thread
;
2098 /* Setup the worker thread */
2099 ret
= pthread_create(&live_worker_thread
, NULL
,
2100 thread_worker
, NULL
);
2103 PERROR("pthread_create viewer worker");
2105 goto exit_worker_thread
;
2108 /* Setup the listener thread */
2109 ret
= pthread_create(&live_listener_thread
, NULL
,
2110 thread_listener
, (void *) NULL
);
2113 PERROR("pthread_create viewer listener");
2115 goto exit_listener_thread
;
2119 * All OK, started all threads.
2124 * Join on the live_listener_thread should anything be added after
2125 * the live_listener thread's creation.
2128 exit_listener_thread
:
2130 ret
= pthread_join(live_worker_thread
, &status
);
2133 PERROR("pthread_join live worker");
2138 ret
= pthread_join(live_dispatcher_thread
, &status
);
2141 PERROR("pthread_join live dispatcher");
2144 exit_dispatcher_thread
:
2147 cleanup_relayd_live();