2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
37 #include <urcu/futex.h>
38 #include <urcu/uatomic.h>
39 #include <urcu/rculist.h>
44 #include <lttng/lttng.h>
45 #include <common/common.h>
46 #include <common/compat/poll.h>
47 #include <common/compat/socket.h>
48 #include <common/compat/endian.h>
49 #include <common/defaults.h>
50 #include <common/futex.h>
51 #include <common/index/index.h>
52 #include <common/sessiond-comm/sessiond-comm.h>
53 #include <common/sessiond-comm/inet.h>
54 #include <common/sessiond-comm/relayd.h>
55 #include <common/uri.h>
56 #include <common/utils.h>
60 #include "lttng-relayd.h"
62 #include "health-relayd.h"
63 #include "testpoint.h"
64 #include "viewer-stream.h"
67 #include "ctf-trace.h"
68 #include "connection.h"
69 #include "viewer-session.h"
71 #define SESSION_BUF_DEFAULT_COUNT 16
73 static struct lttng_uri
*live_uri
;
76 * This pipe is used to inform the worker thread that a command is queued and
77 * ready to be processed.
79 static int live_conn_pipe
[2] = { -1, -1 };
81 /* Shared between threads */
82 static int live_dispatch_thread_exit
;
84 static pthread_t live_listener_thread
;
85 static pthread_t live_dispatcher_thread
;
86 static pthread_t live_worker_thread
;
89 * Relay command queue.
91 * The live_thread_listener and live_thread_dispatcher communicate with this
94 static struct relay_conn_queue viewer_conn_queue
;
96 static uint64_t last_relay_viewer_session_id
;
97 static pthread_mutex_t last_relay_viewer_session_id_lock
=
98 PTHREAD_MUTEX_INITIALIZER
;
104 void cleanup_relayd_live(void)
112 * Receive a request buffer using a given socket, destination allocated buffer
115 * Return the size of the received message or else a negative value on error
116 * with errno being set by recvmsg() syscall.
119 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
123 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
124 if (ret
< 0 || ret
!= size
) {
126 /* Orderly shutdown. Not necessary to print an error. */
127 DBG("Socket %d did an orderly shutdown", sock
->fd
);
129 ERR("Relay failed to receive request.");
138 * Send a response buffer using a given socket, source allocated buffer of
141 * Return the size of the sent message or else a negative value on error with
142 * errno being set by sendmsg() syscall.
145 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
149 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
151 ERR("Relayd failed to send response.");
158 * Atomically check if new streams got added in one of the sessions attached
159 * and reset the flag to 0.
161 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
165 int check_new_streams(struct relay_connection
*conn
)
167 struct relay_session
*session
;
168 unsigned long current_val
;
171 if (!conn
->viewer_session
) {
175 cds_list_for_each_entry_rcu(session
,
176 &conn
->viewer_session
->session_list
,
177 viewer_session_node
) {
178 if (!session_get(session
)) {
181 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
183 session_put(session
);
194 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
195 * this function should ignore the sent flag or not.
197 * Return 0 on success or else a negative value.
200 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
201 struct relay_session
*session
, unsigned int ignore_sent_flag
)
204 struct lttng_viewer_stream send_stream
;
205 struct lttng_ht_iter iter
;
206 struct relay_viewer_stream
*vstream
;
210 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
212 struct ctf_trace
*ctf_trace
;
214 health_code_update();
216 if (!viewer_stream_get(vstream
)) {
220 pthread_mutex_lock(&vstream
->stream
->lock
);
221 /* Ignore if not the same session. */
222 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
223 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
224 pthread_mutex_unlock(&vstream
->stream
->lock
);
225 viewer_stream_put(vstream
);
229 ctf_trace
= vstream
->stream
->trace
;
230 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
231 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
232 send_stream
.metadata_flag
= htobe32(
233 vstream
->stream
->is_metadata
);
234 strncpy(send_stream
.path_name
, vstream
->path_name
,
235 sizeof(send_stream
.path_name
));
236 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
237 sizeof(send_stream
.channel_name
));
239 DBG("Sending stream %" PRIu64
" to viewer",
240 vstream
->stream
->stream_handle
);
241 vstream
->sent_flag
= 1;
242 pthread_mutex_unlock(&vstream
->stream
->lock
);
244 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
245 viewer_stream_put(vstream
);
259 * Create every viewer stream possible for the given session with the seek
260 * type. Three counters *can* be return which are in order the total amount of
261 * viewer stream of the session, the number of unsent stream and the number of
262 * stream created. Those counters can be NULL and thus will be ignored.
264 * Return 0 on success or else a negative value.
267 int make_viewer_streams(struct relay_session
*session
,
268 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
269 uint32_t *nb_created
, bool *closed
)
272 struct lttng_ht_iter iter
;
273 struct ctf_trace
*ctf_trace
;
278 * Hold the session lock to ensure that we see either none or
279 * all initial streams for a session, but no intermediate state.
281 pthread_mutex_lock(&session
->lock
);
283 if (session
->connection_closed
) {
288 * Create viewer streams for relay streams that are ready to be
289 * used for a the given session id only.
292 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
294 struct relay_stream
*stream
;
296 health_code_update();
298 if (!ctf_trace_get(ctf_trace
)) {
302 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
303 struct relay_viewer_stream
*vstream
;
305 if (!stream_get(stream
)) {
309 * stream published is protected by the session lock.
311 if (!stream
->published
) {
314 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
316 vstream
= viewer_stream_create(stream
, seek_t
);
319 ctf_trace_put(ctf_trace
);
325 /* Update number of created stream counter. */
329 * Ensure a self-reference is preserved even
330 * after we have put our local reference.
332 viewer_stream_get(vstream
);
334 if (!vstream
->sent_flag
&& nb_unsent
) {
335 /* Update number of unsent stream counter. */
339 /* Update number of total stream counter. */
341 if (stream
->is_metadata
) {
342 if (!stream
->closed
||
343 stream
->metadata_received
> vstream
->metadata_sent
) {
347 if (!stream
->closed
||
348 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
354 /* Put local reference. */
355 viewer_stream_put(vstream
);
359 ctf_trace_put(ctf_trace
);
366 pthread_mutex_unlock(&session
->lock
);
370 int relayd_live_stop(void)
372 /* Stop dispatch thread */
373 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
374 futex_nto1_wake(&viewer_conn_queue
.futex
);
379 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
382 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
386 if (events
== NULL
|| size
== 0) {
391 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
397 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
409 * Check if the thread quit pipe was triggered.
411 * Return 1 if it was triggered else 0;
414 int check_thread_quit_pipe(int fd
, uint32_t events
)
416 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
424 * Create and init socket from uri.
427 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
430 struct lttcomm_sock
*sock
= NULL
;
432 sock
= lttcomm_alloc_sock_from_uri(uri
);
434 ERR("Allocating socket");
438 ret
= lttcomm_create_sock(sock
);
442 DBG("Listening on sock %d for live", sock
->fd
);
444 ret
= sock
->ops
->bind(sock
);
449 ret
= sock
->ops
->listen(sock
, -1);
459 lttcomm_destroy_sock(sock
);
465 * This thread manages the listening for new connections on the network
468 void *thread_listener(void *data
)
470 int i
, ret
, pollfd
, err
= -1;
471 uint32_t revents
, nb_fd
;
472 struct lttng_poll_event events
;
473 struct lttcomm_sock
*live_control_sock
;
475 DBG("[thread] Relay live listener started");
477 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
479 health_code_update();
481 live_control_sock
= init_socket(live_uri
);
482 if (!live_control_sock
) {
483 goto error_sock_control
;
486 /* Pass 2 as size here for the thread quit pipe and control sockets. */
487 ret
= create_thread_poll_set(&events
, 2);
489 goto error_create_poll
;
492 /* Add the control socket */
493 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
498 lttng_relay_notify_ready();
500 if (testpoint(relayd_thread_live_listener
)) {
501 goto error_testpoint
;
505 health_code_update();
507 DBG("Listener accepting live viewers connections");
511 ret
= lttng_poll_wait(&events
, -1);
515 * Restart interrupted system call.
517 if (errno
== EINTR
) {
524 DBG("Relay new viewer connection received");
525 for (i
= 0; i
< nb_fd
; i
++) {
526 health_code_update();
528 /* Fetch once the poll data */
529 revents
= LTTNG_POLL_GETEV(&events
, i
);
530 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
533 /* No activity for this FD (poll implementation). */
537 /* Thread quit pipe has been closed. Killing thread. */
538 ret
= check_thread_quit_pipe(pollfd
, revents
);
544 if (revents
& LPOLLIN
) {
546 * A new connection is requested, therefore a
547 * viewer connection is allocated in this
548 * thread, enqueued to a global queue and
549 * dequeued (and freed) in the worker thread.
552 struct relay_connection
*new_conn
;
553 struct lttcomm_sock
*newsock
;
555 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
557 PERROR("accepting control sock");
560 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
562 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
565 PERROR("setsockopt inet");
566 lttcomm_destroy_sock(newsock
);
569 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
571 lttcomm_destroy_sock(newsock
);
574 /* Ownership assumed by the connection. */
577 /* Enqueue request for the dispatcher thread. */
578 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
582 * Wake the dispatch queue futex.
583 * Implicit memory barrier with the
584 * exchange in cds_wfcq_enqueue.
586 futex_nto1_wake(&viewer_conn_queue
.futex
);
587 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
588 ERR("socket poll error");
591 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
601 lttng_poll_clean(&events
);
603 if (live_control_sock
->fd
>= 0) {
604 ret
= live_control_sock
->ops
->close(live_control_sock
);
609 lttcomm_destroy_sock(live_control_sock
);
613 DBG("Live viewer listener thread exited with error");
615 health_unregister(health_relayd
);
616 DBG("Live viewer listener thread cleanup complete");
617 if (lttng_relay_stop_threads()) {
618 ERR("Error stopping threads");
624 * This thread manages the dispatching of the requests to worker threads
627 void *thread_dispatcher(void *data
)
631 struct cds_wfcq_node
*node
;
632 struct relay_connection
*conn
= NULL
;
634 DBG("[thread] Live viewer relay dispatcher started");
636 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
638 if (testpoint(relayd_thread_live_dispatcher
)) {
639 goto error_testpoint
;
642 health_code_update();
644 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
645 health_code_update();
647 /* Atomically prepare the queue futex */
648 futex_nto1_prepare(&viewer_conn_queue
.futex
);
651 health_code_update();
653 /* Dequeue commands */
654 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
655 &viewer_conn_queue
.tail
);
657 DBG("Woken up but nothing in the live-viewer "
658 "relay command queue");
659 /* Continue thread execution */
662 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
663 DBG("Dispatching viewer request waiting on sock %d",
667 * Inform worker thread of the new request. This
668 * call is blocking so we can be assured that
669 * the data will be read at some point in time
670 * or wait to the end of the world :)
672 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
674 PERROR("write conn pipe");
675 connection_put(conn
);
678 } while (node
!= NULL
);
680 /* Futex wait on queue. Blocking call on futex() */
682 futex_nto1_wait(&viewer_conn_queue
.futex
);
686 /* Normal exit, no error */
693 ERR("Health error occurred in %s", __func__
);
695 health_unregister(health_relayd
);
696 DBG("Live viewer dispatch thread dying");
697 if (lttng_relay_stop_threads()) {
698 ERR("Error stopping threads");
704 * Establish connection with the viewer and check the versions.
706 * Return 0 on success or else negative value.
709 int viewer_connect(struct relay_connection
*conn
)
712 struct lttng_viewer_connect reply
, msg
;
714 conn
->version_check_done
= 1;
716 health_code_update();
718 DBG("Viewer is establishing a connection to the relayd.");
720 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
725 health_code_update();
727 memset(&reply
, 0, sizeof(reply
));
728 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
729 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
731 /* Major versions must be the same */
732 if (reply
.major
!= be32toh(msg
.major
)) {
733 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
734 reply
.major
, be32toh(msg
.major
));
739 conn
->major
= reply
.major
;
740 /* We adapt to the lowest compatible version */
741 if (reply
.minor
<= be32toh(msg
.minor
)) {
742 conn
->minor
= reply
.minor
;
744 conn
->minor
= be32toh(msg
.minor
);
747 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
748 conn
->type
= RELAY_VIEWER_COMMAND
;
749 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
750 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
752 ERR("Unknown connection type : %u", be32toh(msg
.type
));
757 reply
.major
= htobe32(reply
.major
);
758 reply
.minor
= htobe32(reply
.minor
);
759 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
761 * Increment outside of htobe64 macro, because the argument can
762 * be used more than once within the macro, and thus the
763 * operation may be undefined.
765 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
766 last_relay_viewer_session_id
++;
767 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
768 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
771 health_code_update();
773 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
778 health_code_update();
780 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
788 * Send the viewer the list of current sessions.
789 * We need to create a copy of the hash table content because otherwise
790 * we cannot assume the number of entries stays the same between getting
791 * the number of HT elements and iteration over the HT.
793 * Return 0 on success or else a negative value.
796 int viewer_list_sessions(struct relay_connection
*conn
)
799 struct lttng_viewer_list_sessions session_list
;
800 struct lttng_ht_iter iter
;
801 struct relay_session
*session
;
802 struct lttng_viewer_session
*send_session_buf
= NULL
;
803 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
806 DBG("List sessions received");
808 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
809 if (!send_session_buf
) {
814 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
816 struct lttng_viewer_session
*send_session
;
818 health_code_update();
820 if (count
>= buf_count
) {
821 struct lttng_viewer_session
*newbuf
;
822 uint32_t new_buf_count
= buf_count
<< 1;
824 newbuf
= realloc(send_session_buf
,
825 new_buf_count
* sizeof(*send_session_buf
));
831 send_session_buf
= newbuf
;
832 buf_count
= new_buf_count
;
834 send_session
= &send_session_buf
[count
];
835 if (lttng_strncpy(send_session
->session_name
,
836 session
->session_name
,
837 sizeof(send_session
->session_name
))) {
842 if (lttng_strncpy(send_session
->hostname
, session
->hostname
,
843 sizeof(send_session
->hostname
))) {
848 send_session
->id
= htobe64(session
->id
);
849 send_session
->live_timer
= htobe32(session
->live_timer
);
850 if (session
->viewer_attached
) {
851 send_session
->clients
= htobe32(1);
853 send_session
->clients
= htobe32(0);
855 send_session
->streams
= htobe32(session
->stream_count
);
860 session_list
.sessions_count
= htobe32(count
);
862 health_code_update();
864 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
869 health_code_update();
871 ret
= send_response(conn
->sock
, send_session_buf
,
872 count
* sizeof(*send_session_buf
));
876 health_code_update();
880 free(send_session_buf
);
885 * Send the viewer the list of current streams.
888 int viewer_get_new_streams(struct relay_connection
*conn
)
890 int ret
, send_streams
= 0;
891 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
892 struct lttng_viewer_new_streams_request request
;
893 struct lttng_viewer_new_streams_response response
;
894 struct relay_session
*session
;
900 DBG("Get new streams received");
902 health_code_update();
904 /* Receive the request from the connected client. */
905 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
909 session_id
= be64toh(request
.session_id
);
911 health_code_update();
913 memset(&response
, 0, sizeof(response
));
915 session
= session_get_by_id(session_id
);
917 DBG("Relay session %" PRIu64
" not found", session_id
);
918 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
922 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
924 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
929 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
931 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
932 &nb_created
, &closed
);
934 goto end_put_session
;
936 /* Only send back the newly created streams with the unsent ones. */
937 nb_streams
= nb_created
+ nb_unsent
;
938 response
.streams_count
= htobe32(nb_streams
);
941 * If the session is closed, HUP when there are no more streams
944 if (closed
&& nb_total
== 0) {
946 response
.streams_count
= 0;
947 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
952 health_code_update();
953 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
955 goto end_put_session
;
957 health_code_update();
960 * Unknown or empty session, just return gracefully, the viewer
961 * knows what is happening.
963 if (!send_streams
|| !nb_streams
) {
965 goto end_put_session
;
969 * Send stream and *DON'T* ignore the sent flag so every viewer
970 * streams that were not sent from that point will be sent to
973 ret
= send_viewer_streams(conn
->sock
, session
, 0);
975 goto end_put_session
;
980 session_put(session
);
987 * Send the viewer the list of current sessions.
990 int viewer_attach_session(struct relay_connection
*conn
)
992 int send_streams
= 0;
994 uint32_t nb_streams
= 0;
995 enum lttng_viewer_seek seek_type
;
996 struct lttng_viewer_attach_session_request request
;
997 struct lttng_viewer_attach_session_response response
;
998 struct relay_session
*session
= NULL
;
1003 health_code_update();
1005 /* Receive the request from the connected client. */
1006 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1011 health_code_update();
1013 memset(&response
, 0, sizeof(response
));
1015 if (!conn
->viewer_session
) {
1016 DBG("Client trying to attach before creating a live viewer session");
1017 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1021 session
= session_get_by_id(be64toh(request
.session_id
));
1023 DBG("Relay session %" PRIu64
" not found",
1024 be64toh(request
.session_id
));
1025 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1028 DBG("Attach session ID %" PRIu64
" received",
1029 be64toh(request
.session_id
));
1031 if (session
->live_timer
== 0) {
1032 DBG("Not live session");
1033 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1038 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1040 DBG("Already a viewer attached");
1041 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1045 switch (be32toh(request
.seek
)) {
1046 case LTTNG_VIEWER_SEEK_BEGINNING
:
1047 case LTTNG_VIEWER_SEEK_LAST
:
1048 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1049 seek_type
= be32toh(request
.seek
);
1052 ERR("Wrong seek parameter");
1053 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1058 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1061 goto end_put_session
;
1063 response
.streams_count
= htobe32(nb_streams
);
1066 * If the session is closed when the viewer is attaching, it
1067 * means some of the streams may have been concurrently removed,
1068 * so we don't allow the viewer to attach, even if there are
1069 * streams available.
1073 response
.streams_count
= 0;
1074 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1079 health_code_update();
1080 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1082 goto end_put_session
;
1084 health_code_update();
1087 * Unknown or empty session, just return gracefully, the viewer
1088 * knows what is happening.
1090 if (!send_streams
|| !nb_streams
) {
1092 goto end_put_session
;
1095 /* Send stream and ignore the sent flag. */
1096 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1098 goto end_put_session
;
1103 session_put(session
);
1110 * Open the index file if needed for the given vstream.
1112 * If an index file is successfully opened, the vstream index_fd set with
1115 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1117 * Called with rstream lock held.
1119 static int try_open_index(struct relay_viewer_stream
*vstream
,
1120 struct relay_stream
*rstream
)
1124 if (vstream
->index_fd
) {
1129 * First time, we open the index file and at least one index is ready.
1131 if (rstream
->index_received_seqcount
== 0) {
1135 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1136 vstream
->stream
->tracefile_count
,
1137 vstream
->current_tracefile_id
);
1139 vstream
->index_fd
= stream_fd_create(ret
);
1140 if (!vstream
->index_fd
) {
1156 * Check the status of the index for the given stream. This function
1157 * updates the index structure if needed and can put (close) the vstream
1158 * in the HUP situation.
1160 * Return 0 means that we can proceed with the index. A value of 1 means
1161 * that the index has been updated and is ready to be sent to the
1162 * client. A negative value indicates an error that can't be handled.
1164 * Called with rstream lock held.
1166 static int check_index_status(struct relay_viewer_stream
*vstream
,
1167 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1168 struct lttng_viewer_index
*index
)
1172 if (trace
->session
->connection_closed
1173 && rstream
->index_received_seqcount
1174 == vstream
->index_sent_seqcount
) {
1175 /* Last index sent and session connection is closed. */
1176 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1178 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1179 rstream
->index_received_seqcount
1180 == vstream
->index_sent_seqcount
) {
1182 * We've received a synchronization beacon and the last index
1183 * available has been sent, the index for now is inactive.
1185 * In this case, we have received a beacon which allows us to
1186 * inform the client of a time interval during which we can
1187 * guarantee that there are no events to read (and never will
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
->index_received_seqcount
1195 == vstream
->index_sent_seqcount
) {
1197 * This checks whether received == sent seqcount. In
1198 * this case, we have not received a beacon. Therefore,
1199 * we can only ask the client to retry later.
1201 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1203 } else if (!tracefile_array_seq_in_file(rstream
->tfa
,
1204 vstream
->current_tracefile_id
,
1205 vstream
->index_sent_seqcount
)) {
1207 * The next index we want to send cannot be read either
1208 * because we need to perform a rotation, or due to
1209 * the producer having overwritten its trace file.
1211 DBG("Viewer stream %" PRIu64
" rotation",
1212 vstream
->stream
->stream_handle
);
1213 ret
= viewer_stream_rotate(vstream
);
1216 } else if (ret
== 1) {
1217 /* EOF across entire stream. */
1218 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1222 * If we have been pushed due to overwrite, it
1223 * necessarily means there is data that can be read in
1224 * the stream. If we rotated because we reached the end
1225 * of a tracefile, it means the following tracefile
1226 * needs to contain at least one index, else we would
1227 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1228 * viewer. The updated index_sent_seqcount needs to
1229 * point to a readable index entry now.
1231 * In the case where we "rotate" on a single file, we
1232 * can end up in a case where the requested index is
1233 * still unavailable.
1235 if (rstream
->tracefile_count
== 1 &&
1236 !tracefile_array_seq_in_file(
1238 vstream
->current_tracefile_id
,
1239 vstream
->index_sent_seqcount
)) {
1240 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1243 assert(tracefile_array_seq_in_file(rstream
->tfa
,
1244 vstream
->current_tracefile_id
,
1245 vstream
->index_sent_seqcount
));
1247 /* ret == 0 means successful so we continue. */
1253 viewer_stream_put(vstream
);
1259 * Send the next index for a stream.
1261 * Return 0 on success or else a negative value.
1264 int viewer_get_next_index(struct relay_connection
*conn
)
1268 struct lttng_viewer_get_next_index request_index
;
1269 struct lttng_viewer_index viewer_index
;
1270 struct ctf_packet_index packet_index
;
1271 struct relay_viewer_stream
*vstream
= NULL
;
1272 struct relay_stream
*rstream
= NULL
;
1273 struct ctf_trace
*ctf_trace
= NULL
;
1274 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1278 DBG("Viewer get next index");
1280 memset(&viewer_index
, 0, sizeof(viewer_index
));
1281 health_code_update();
1283 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1287 health_code_update();
1289 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1291 DBG("Client requested index of unknown stream id %" PRIu64
,
1292 be64toh(request_index
.stream_id
));
1293 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1297 /* Use back. ref. Protected by refcounts. */
1298 rstream
= vstream
->stream
;
1299 ctf_trace
= rstream
->trace
;
1301 /* metadata_viewer_stream may be NULL. */
1302 metadata_viewer_stream
=
1303 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1305 pthread_mutex_lock(&rstream
->lock
);
1308 * The viewer should not ask for index on metadata stream.
1310 if (rstream
->is_metadata
) {
1311 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1315 /* Try to open an index if one is needed for that stream. */
1316 ret
= try_open_index(vstream
, rstream
);
1318 if (ret
== -ENOENT
) {
1320 * The index is created only when the first data
1321 * packet arrives, it might not be ready at the
1322 * beginning of the session
1324 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1326 /* Unhandled error. */
1327 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1332 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1335 } else if (ret
== 1) {
1337 * We have no index to send and check_index_status has populated
1338 * viewer_index's status.
1342 /* At this point, ret is 0 thus we will be able to read the index. */
1346 * vstream->stream_fd may be NULL if it has been closed by
1347 * tracefile rotation, or if we are at the beginning of the
1348 * stream. We open the data stream file here to protect against
1349 * overwrite caused by tracefile rotation (in association with
1350 * unlink performed before overwrite).
1352 if (!vstream
->stream_fd
) {
1353 char fullpath
[PATH_MAX
];
1355 if (vstream
->stream
->tracefile_count
> 0) {
1356 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1358 vstream
->channel_name
,
1359 vstream
->current_tracefile_id
);
1361 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1363 vstream
->channel_name
);
1368 ret
= open(fullpath
, O_RDONLY
);
1370 PERROR("Relay opening trace file");
1373 vstream
->stream_fd
= stream_fd_create(ret
);
1374 if (!vstream
->stream_fd
) {
1382 ret
= check_new_streams(conn
);
1384 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1386 } else if (ret
== 1) {
1387 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1390 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1391 sizeof(packet_index
));
1392 if (read_ret
< sizeof(packet_index
)) {
1393 ERR("Relay reading index file %d returned %zd",
1394 vstream
->index_fd
->fd
, read_ret
);
1395 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1398 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1399 vstream
->index_sent_seqcount
++;
1403 * Indexes are stored in big endian, no need to switch before sending.
1405 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1406 rstream
->stream_handle
,
1407 be64toh(packet_index
.offset
));
1408 viewer_index
.offset
= packet_index
.offset
;
1409 viewer_index
.packet_size
= packet_index
.packet_size
;
1410 viewer_index
.content_size
= packet_index
.content_size
;
1411 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1412 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1413 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1414 viewer_index
.stream_id
= packet_index
.stream_id
;
1418 pthread_mutex_unlock(&rstream
->lock
);
1421 if (metadata_viewer_stream
) {
1422 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1423 DBG("get next index metadata check: recv %" PRIu64
1425 metadata_viewer_stream
->stream
->metadata_received
,
1426 metadata_viewer_stream
->metadata_sent
);
1427 if (!metadata_viewer_stream
->stream
->metadata_received
||
1428 metadata_viewer_stream
->stream
->metadata_received
>
1429 metadata_viewer_stream
->metadata_sent
) {
1430 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1432 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1435 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1436 health_code_update();
1438 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1442 health_code_update();
1445 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1446 vstream
->index_sent_seqcount
,
1447 vstream
->stream
->stream_handle
);
1450 if (metadata_viewer_stream
) {
1451 viewer_stream_put(metadata_viewer_stream
);
1454 viewer_stream_put(vstream
);
1459 pthread_mutex_unlock(&rstream
->lock
);
1460 if (metadata_viewer_stream
) {
1461 viewer_stream_put(metadata_viewer_stream
);
1463 viewer_stream_put(vstream
);
1468 * Send the next index for a stream
1470 * Return 0 on success or else a negative value.
1473 int viewer_get_packet(struct relay_connection
*conn
)
1475 int ret
, send_data
= 0;
1479 struct lttng_viewer_get_packet get_packet_info
;
1480 struct lttng_viewer_trace_packet reply
;
1481 struct relay_viewer_stream
*vstream
= NULL
;
1483 DBG2("Relay get data packet");
1485 health_code_update();
1487 ret
= recv_request(conn
->sock
, &get_packet_info
,
1488 sizeof(get_packet_info
));
1492 health_code_update();
1494 /* From this point on, the error label can be reached. */
1495 memset(&reply
, 0, sizeof(reply
));
1497 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1499 DBG("Client requested packet of unknown stream id %" PRIu64
,
1500 be64toh(get_packet_info
.stream_id
));
1501 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1502 goto send_reply_nolock
;
1505 pthread_mutex_lock(&vstream
->stream
->lock
);
1507 len
= be32toh(get_packet_info
.len
);
1508 data
= zmalloc(len
);
1510 PERROR("relay data zmalloc");
1514 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1517 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1518 be64toh(get_packet_info
.offset
));
1521 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1522 if (read_len
< len
) {
1523 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1524 vstream
->stream_fd
->fd
,
1525 be64toh(get_packet_info
.offset
));
1528 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1529 reply
.len
= htobe32(len
);
1534 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1538 pthread_mutex_unlock(&vstream
->stream
->lock
);
1541 reply
.flags
= htobe32(reply
.flags
);
1543 health_code_update();
1545 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1549 health_code_update();
1552 health_code_update();
1553 ret
= send_response(conn
->sock
, data
, len
);
1557 health_code_update();
1560 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1561 be64toh(get_packet_info
.stream_id
));
1567 viewer_stream_put(vstream
);
1573 * Send the session's metadata
1575 * Return 0 on success else a negative value.
1578 int viewer_get_metadata(struct relay_connection
*conn
)
1584 struct lttng_viewer_get_metadata request
;
1585 struct lttng_viewer_metadata_packet reply
;
1586 struct relay_viewer_stream
*vstream
= NULL
;
1590 DBG("Relay get metadata");
1592 health_code_update();
1594 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1598 health_code_update();
1600 memset(&reply
, 0, sizeof(reply
));
1602 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1605 * The metadata stream can be closed by a CLOSE command
1606 * just before we attach. It can also be closed by
1607 * per-pid tracing during tracing. Therefore, it is
1608 * possible that we cannot find this viewer stream.
1609 * Reply back to the client with an error if we cannot
1612 DBG("Client requested metadata of unknown stream id %" PRIu64
,
1613 be64toh(request
.stream_id
));
1614 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1617 pthread_mutex_lock(&vstream
->stream
->lock
);
1618 if (!vstream
->stream
->is_metadata
) {
1619 ERR("Invalid metadata stream");
1623 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1625 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1627 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1631 /* first time, we open the metadata file */
1632 if (!vstream
->stream_fd
) {
1633 char fullpath
[PATH_MAX
];
1635 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1636 vstream
->channel_name
);
1640 ret
= open(fullpath
, O_RDONLY
);
1642 PERROR("Relay opening metadata file");
1645 vstream
->stream_fd
= stream_fd_create(ret
);
1646 if (!vstream
->stream_fd
) {
1654 reply
.len
= htobe64(len
);
1655 data
= zmalloc(len
);
1657 PERROR("viewer metadata zmalloc");
1661 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1662 if (read_len
< len
) {
1663 PERROR("Relay reading metadata file");
1666 vstream
->metadata_sent
+= read_len
;
1667 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1668 && vstream
->stream
->closed
) {
1669 /* Release ownership for the viewer metadata stream. */
1670 viewer_stream_put(vstream
);
1673 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1678 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1681 health_code_update();
1683 pthread_mutex_unlock(&vstream
->stream
->lock
);
1685 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1689 health_code_update();
1692 ret
= send_response(conn
->sock
, data
, len
);
1698 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1699 be64toh(request
.stream_id
));
1701 DBG("Metadata sent");
1707 viewer_stream_put(vstream
);
1713 * Create a viewer session.
1715 * Return 0 on success or else a negative value.
1718 int viewer_create_session(struct relay_connection
*conn
)
1721 struct lttng_viewer_create_session_response resp
;
1723 DBG("Viewer create session received");
1725 memset(&resp
, 0, sizeof(resp
));
1726 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1727 conn
->viewer_session
= viewer_session_create();
1728 if (!conn
->viewer_session
) {
1729 ERR("Allocation viewer session");
1730 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1735 health_code_update();
1736 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1740 health_code_update();
1749 * live_relay_unknown_command: send -1 if received unknown command
1752 void live_relay_unknown_command(struct relay_connection
*conn
)
1754 struct lttcomm_relayd_generic_reply reply
;
1756 memset(&reply
, 0, sizeof(reply
));
1757 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1758 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1762 * Process the commands received on the control socket
1765 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1766 struct relay_connection
*conn
)
1771 msg_value
= be32toh(recv_hdr
->cmd
);
1774 * Make sure we've done the version check before any command other then a
1775 * new client connection.
1777 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1778 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1783 switch (msg_value
) {
1784 case LTTNG_VIEWER_CONNECT
:
1785 ret
= viewer_connect(conn
);
1787 case LTTNG_VIEWER_LIST_SESSIONS
:
1788 ret
= viewer_list_sessions(conn
);
1790 case LTTNG_VIEWER_ATTACH_SESSION
:
1791 ret
= viewer_attach_session(conn
);
1793 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1794 ret
= viewer_get_next_index(conn
);
1796 case LTTNG_VIEWER_GET_PACKET
:
1797 ret
= viewer_get_packet(conn
);
1799 case LTTNG_VIEWER_GET_METADATA
:
1800 ret
= viewer_get_metadata(conn
);
1802 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1803 ret
= viewer_get_new_streams(conn
);
1805 case LTTNG_VIEWER_CREATE_SESSION
:
1806 ret
= viewer_create_session(conn
);
1809 ERR("Received unknown viewer command (%u)",
1810 be32toh(recv_hdr
->cmd
));
1811 live_relay_unknown_command(conn
);
1821 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1825 (void) lttng_poll_del(events
, pollfd
);
1827 ret
= close(pollfd
);
1829 ERR("Closing pollfd %d", pollfd
);
1834 * This thread does the actual work
1837 void *thread_worker(void *data
)
1841 struct lttng_poll_event events
;
1842 struct lttng_ht
*viewer_connections_ht
;
1843 struct lttng_ht_iter iter
;
1844 struct lttng_viewer_cmd recv_hdr
;
1845 struct relay_connection
*destroy_conn
;
1847 DBG("[thread] Live viewer relay worker started");
1849 rcu_register_thread();
1851 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1853 if (testpoint(relayd_thread_live_worker
)) {
1854 goto error_testpoint
;
1857 /* table of connections indexed on socket */
1858 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1859 if (!viewer_connections_ht
) {
1860 goto viewer_connections_ht_error
;
1863 ret
= create_thread_poll_set(&events
, 2);
1865 goto error_poll_create
;
1868 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1877 health_code_update();
1879 /* Infinite blocking call, waiting for transmission */
1880 DBG3("Relayd live viewer worker thread polling...");
1881 health_poll_entry();
1882 ret
= lttng_poll_wait(&events
, -1);
1886 * Restart interrupted system call.
1888 if (errno
== EINTR
) {
1897 * Process control. The control connection is prioritised so we don't
1898 * starve it with high throughput tracing data on the data
1901 for (i
= 0; i
< nb_fd
; i
++) {
1902 /* Fetch once the poll data */
1903 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1904 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1906 health_code_update();
1909 /* No activity for this FD (poll implementation). */
1913 /* Thread quit pipe has been closed. Killing thread. */
1914 ret
= check_thread_quit_pipe(pollfd
, revents
);
1920 /* Inspect the relay conn pipe for new connection. */
1921 if (pollfd
== live_conn_pipe
[0]) {
1922 if (revents
& LPOLLIN
) {
1923 struct relay_connection
*conn
;
1925 ret
= lttng_read(live_conn_pipe
[0],
1926 &conn
, sizeof(conn
));
1930 lttng_poll_add(&events
, conn
->sock
->fd
,
1931 LPOLLIN
| LPOLLRDHUP
);
1932 connection_ht_add(viewer_connections_ht
, conn
);
1933 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1934 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1935 ERR("Relay live pipe error");
1938 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1942 /* Connection activity. */
1943 struct relay_connection
*conn
;
1945 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1950 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
);
1969 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1970 cleanup_connection_pollfd(&events
, pollfd
);
1971 /* Put "create" ownership reference. */
1972 connection_put(conn
);
1974 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1975 connection_put(conn
);
1978 /* Put local "get_by_sock" reference. */
1979 connection_put(conn
);
1986 lttng_poll_clean(&events
);
1988 /* Cleanup reamaining connection object. */
1990 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
1993 health_code_update();
1994 connection_put(destroy_conn
);
1998 lttng_ht_destroy(viewer_connections_ht
);
1999 viewer_connections_ht_error
:
2000 /* Close relay conn pipes */
2001 utils_close_pipe(live_conn_pipe
);
2003 DBG("Viewer worker thread exited with error");
2005 DBG("Viewer worker thread cleanup complete");
2009 ERR("Health error occurred in %s", __func__
);
2011 health_unregister(health_relayd
);
2012 if (lttng_relay_stop_threads()) {
2013 ERR("Error stopping threads");
2015 rcu_unregister_thread();
2020 * Create the relay command pipe to wake thread_manage_apps.
2021 * Closed in cleanup().
2023 static int create_conn_pipe(void)
2025 return utils_create_pipe_cloexec(live_conn_pipe
);
2028 int relayd_live_join(void)
2030 int ret
, retval
= 0;
2033 ret
= pthread_join(live_listener_thread
, &status
);
2036 PERROR("pthread_join live listener");
2040 ret
= pthread_join(live_worker_thread
, &status
);
2043 PERROR("pthread_join live worker");
2047 ret
= pthread_join(live_dispatcher_thread
, &status
);
2050 PERROR("pthread_join live dispatcher");
2054 cleanup_relayd_live();
2062 int relayd_live_create(struct lttng_uri
*uri
)
2064 int ret
= 0, retval
= 0;
2070 goto exit_init_data
;
2074 /* Check if daemon is UID = 0 */
2075 is_root
= !getuid();
2078 if (live_uri
->port
< 1024) {
2079 ERR("Need to be root to use ports < 1024");
2081 goto exit_init_data
;
2085 /* Setup the thread apps communication pipe. */
2086 if (create_conn_pipe()) {
2088 goto exit_init_data
;
2091 /* Init relay command queue. */
2092 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2094 /* Set up max poll set size */
2095 lttng_poll_set_max_size();
2097 /* Setup the dispatcher thread */
2098 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2099 thread_dispatcher
, (void *) NULL
);
2102 PERROR("pthread_create viewer dispatcher");
2104 goto exit_dispatcher_thread
;
2107 /* Setup the worker thread */
2108 ret
= pthread_create(&live_worker_thread
, NULL
,
2109 thread_worker
, NULL
);
2112 PERROR("pthread_create viewer worker");
2114 goto exit_worker_thread
;
2117 /* Setup the listener thread */
2118 ret
= pthread_create(&live_listener_thread
, NULL
,
2119 thread_listener
, (void *) NULL
);
2122 PERROR("pthread_create viewer listener");
2124 goto exit_listener_thread
;
2128 * All OK, started all threads.
2133 * Join on the live_listener_thread should anything be added after
2134 * the live_listener thread's creation.
2137 exit_listener_thread
:
2139 ret
= pthread_join(live_worker_thread
, &status
);
2142 PERROR("pthread_join live worker");
2147 ret
= pthread_join(live_dispatcher_thread
, &status
);
2150 PERROR("pthread_join live dispatcher");
2153 exit_dispatcher_thread
:
2156 cleanup_relayd_live();