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>
43 #include <lttng/lttng.h>
44 #include <common/common.h>
45 #include <common/compat/poll.h>
46 #include <common/compat/socket.h>
47 #include <common/compat/endian.h>
48 #include <common/defaults.h>
49 #include <common/futex.h>
50 #include <common/index/index.h>
51 #include <common/sessiond-comm/sessiond-comm.h>
52 #include <common/sessiond-comm/inet.h>
53 #include <common/sessiond-comm/relayd.h>
54 #include <common/uri.h>
55 #include <common/utils.h>
59 #include "lttng-relayd.h"
61 #include "health-relayd.h"
62 #include "testpoint.h"
63 #include "viewer-stream.h"
66 #include "ctf-trace.h"
67 #include "connection.h"
68 #include "viewer-session.h"
70 #define SESSION_BUF_DEFAULT_COUNT 16
72 static struct lttng_uri
*live_uri
;
75 * This pipe is used to inform the worker thread that a command is queued and
76 * ready to be processed.
78 static int live_conn_pipe
[2] = { -1, -1 };
80 /* Shared between threads */
81 static int live_dispatch_thread_exit
;
83 static pthread_t live_listener_thread
;
84 static pthread_t live_dispatcher_thread
;
85 static pthread_t live_worker_thread
;
88 * Relay command queue.
90 * The live_thread_listener and live_thread_dispatcher communicate with this
93 static struct relay_conn_queue viewer_conn_queue
;
95 static uint64_t last_relay_viewer_session_id
;
96 static pthread_mutex_t last_relay_viewer_session_id_lock
=
97 PTHREAD_MUTEX_INITIALIZER
;
103 void cleanup_relayd_live(void)
111 * Receive a request buffer using a given socket, destination allocated buffer
114 * Return the size of the received message or else a negative value on error
115 * with errno being set by recvmsg() syscall.
118 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
122 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
123 if (ret
< 0 || ret
!= size
) {
125 /* Orderly shutdown. Not necessary to print an error. */
126 DBG("Socket %d did an orderly shutdown", sock
->fd
);
128 ERR("Relay failed to receive request.");
137 * Send a response buffer using a given socket, source allocated buffer of
140 * Return the size of the sent message or else a negative value on error with
141 * errno being set by sendmsg() syscall.
144 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
148 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
150 ERR("Relayd failed to send response.");
157 * Atomically check if new streams got added in one of the sessions attached
158 * and reset the flag to 0.
160 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
164 int check_new_streams(struct relay_connection
*conn
)
166 struct relay_session
*session
;
167 unsigned long current_val
;
170 if (!conn
->viewer_session
) {
174 cds_list_for_each_entry_rcu(session
,
175 &conn
->viewer_session
->session_list
,
176 viewer_session_node
) {
177 if (!session_get(session
)) {
180 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
182 session_put(session
);
193 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
194 * this function should ignore the sent flag or not.
196 * Return 0 on success or else a negative value.
199 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
200 struct relay_session
*session
, unsigned int ignore_sent_flag
)
203 struct lttng_viewer_stream send_stream
;
204 struct lttng_ht_iter iter
;
205 struct relay_viewer_stream
*vstream
;
209 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
211 struct ctf_trace
*ctf_trace
;
213 health_code_update();
215 if (!viewer_stream_get(vstream
)) {
219 pthread_mutex_lock(&vstream
->stream
->lock
);
220 /* Ignore if not the same session. */
221 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
222 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
223 pthread_mutex_unlock(&vstream
->stream
->lock
);
224 viewer_stream_put(vstream
);
228 ctf_trace
= vstream
->stream
->trace
;
229 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
230 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
231 send_stream
.metadata_flag
= htobe32(
232 vstream
->stream
->is_metadata
);
233 strncpy(send_stream
.path_name
, vstream
->path_name
,
234 sizeof(send_stream
.path_name
));
235 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
236 sizeof(send_stream
.channel_name
));
238 DBG("Sending stream %" PRIu64
" to viewer",
239 vstream
->stream
->stream_handle
);
240 vstream
->sent_flag
= 1;
241 pthread_mutex_unlock(&vstream
->stream
->lock
);
243 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
244 viewer_stream_put(vstream
);
258 * Create every viewer stream possible for the given session with the seek
259 * type. Three counters *can* be return which are in order the total amount of
260 * viewer stream of the session, the number of unsent stream and the number of
261 * stream created. Those counters can be NULL and thus will be ignored.
263 * Return 0 on success or else a negative value.
266 int make_viewer_streams(struct relay_session
*session
,
267 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
268 uint32_t *nb_created
, bool *closed
)
271 struct lttng_ht_iter iter
;
272 struct ctf_trace
*ctf_trace
;
277 * Hold the session lock to ensure that we see either none or
278 * all initial streams for a session, but no intermediate state.
280 pthread_mutex_lock(&session
->lock
);
282 if (session
->connection_closed
) {
287 * Create viewer streams for relay streams that are ready to be
288 * used for a the given session id only.
291 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
293 struct relay_stream
*stream
;
295 health_code_update();
297 if (!ctf_trace_get(ctf_trace
)) {
301 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
302 struct relay_viewer_stream
*vstream
;
304 if (!stream_get(stream
)) {
308 * stream published is protected by the session lock.
310 if (!stream
->published
) {
313 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
315 vstream
= viewer_stream_create(stream
, seek_t
);
318 ctf_trace_put(ctf_trace
);
324 /* Update number of created stream counter. */
328 * Ensure a self-reference is preserved even
329 * after we have put our local reference.
331 viewer_stream_get(vstream
);
333 if (!vstream
->sent_flag
&& nb_unsent
) {
334 /* Update number of unsent stream counter. */
338 /* Update number of total stream counter. */
340 if (stream
->is_metadata
) {
341 if (!stream
->closed
||
342 stream
->metadata_received
> vstream
->metadata_sent
) {
346 if (!stream
->closed
||
347 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
353 /* Put local reference. */
354 viewer_stream_put(vstream
);
358 ctf_trace_put(ctf_trace
);
365 pthread_mutex_unlock(&session
->lock
);
369 int relayd_live_stop(void)
371 /* Stop dispatch thread */
372 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
373 futex_nto1_wake(&viewer_conn_queue
.futex
);
378 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
381 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
385 if (events
== NULL
|| size
== 0) {
390 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
396 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
408 * Check if the thread quit pipe was triggered.
410 * Return 1 if it was triggered else 0;
413 int check_thread_quit_pipe(int fd
, uint32_t events
)
415 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
423 * Create and init socket from uri.
426 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
429 struct lttcomm_sock
*sock
= NULL
;
431 sock
= lttcomm_alloc_sock_from_uri(uri
);
433 ERR("Allocating socket");
437 ret
= lttcomm_create_sock(sock
);
441 DBG("Listening on sock %d for live", sock
->fd
);
443 ret
= sock
->ops
->bind(sock
);
448 ret
= sock
->ops
->listen(sock
, -1);
458 lttcomm_destroy_sock(sock
);
464 * This thread manages the listening for new connections on the network
467 void *thread_listener(void *data
)
469 int i
, ret
, pollfd
, err
= -1;
470 uint32_t revents
, nb_fd
;
471 struct lttng_poll_event events
;
472 struct lttcomm_sock
*live_control_sock
;
474 DBG("[thread] Relay live listener started");
476 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
478 health_code_update();
480 live_control_sock
= init_socket(live_uri
);
481 if (!live_control_sock
) {
482 goto error_sock_control
;
485 /* Pass 2 as size here for the thread quit pipe and control sockets. */
486 ret
= create_thread_poll_set(&events
, 2);
488 goto error_create_poll
;
491 /* Add the control socket */
492 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
497 lttng_relay_notify_ready();
499 if (testpoint(relayd_thread_live_listener
)) {
500 goto error_testpoint
;
504 health_code_update();
506 DBG("Listener accepting live viewers connections");
510 ret
= lttng_poll_wait(&events
, -1);
514 * Restart interrupted system call.
516 if (errno
== EINTR
) {
523 DBG("Relay new viewer connection received");
524 for (i
= 0; i
< nb_fd
; i
++) {
525 health_code_update();
527 /* Fetch once the poll data */
528 revents
= LTTNG_POLL_GETEV(&events
, i
);
529 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
532 /* No activity for this FD (poll implementation). */
536 /* Thread quit pipe has been closed. Killing thread. */
537 ret
= check_thread_quit_pipe(pollfd
, revents
);
543 if (revents
& LPOLLIN
) {
545 * A new connection is requested, therefore a
546 * viewer connection is allocated in this
547 * thread, enqueued to a global queue and
548 * dequeued (and freed) in the worker thread.
551 struct relay_connection
*new_conn
;
552 struct lttcomm_sock
*newsock
;
554 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
556 PERROR("accepting control sock");
559 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
561 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
564 PERROR("setsockopt inet");
565 lttcomm_destroy_sock(newsock
);
568 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
570 lttcomm_destroy_sock(newsock
);
573 /* Ownership assumed by the connection. */
576 /* Enqueue request for the dispatcher thread. */
577 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
581 * Wake the dispatch queue futex.
582 * Implicit memory barrier with the
583 * exchange in cds_wfcq_enqueue.
585 futex_nto1_wake(&viewer_conn_queue
.futex
);
586 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
587 ERR("socket poll error");
590 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
600 lttng_poll_clean(&events
);
602 if (live_control_sock
->fd
>= 0) {
603 ret
= live_control_sock
->ops
->close(live_control_sock
);
608 lttcomm_destroy_sock(live_control_sock
);
612 DBG("Live viewer listener thread exited with error");
614 health_unregister(health_relayd
);
615 DBG("Live viewer listener thread cleanup complete");
616 if (lttng_relay_stop_threads()) {
617 ERR("Error stopping threads");
623 * This thread manages the dispatching of the requests to worker threads
626 void *thread_dispatcher(void *data
)
630 struct cds_wfcq_node
*node
;
631 struct relay_connection
*conn
= NULL
;
633 DBG("[thread] Live viewer relay dispatcher started");
635 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
637 if (testpoint(relayd_thread_live_dispatcher
)) {
638 goto error_testpoint
;
641 health_code_update();
643 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
644 health_code_update();
646 /* Atomically prepare the queue futex */
647 futex_nto1_prepare(&viewer_conn_queue
.futex
);
650 health_code_update();
652 /* Dequeue commands */
653 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
654 &viewer_conn_queue
.tail
);
656 DBG("Woken up but nothing in the live-viewer "
657 "relay command queue");
658 /* Continue thread execution */
661 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
662 DBG("Dispatching viewer request waiting on sock %d",
666 * Inform worker thread of the new request. This
667 * call is blocking so we can be assured that
668 * the data will be read at some point in time
669 * or wait to the end of the world :)
671 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
673 PERROR("write conn pipe");
674 connection_put(conn
);
677 } while (node
!= NULL
);
679 /* Futex wait on queue. Blocking call on futex() */
681 futex_nto1_wait(&viewer_conn_queue
.futex
);
685 /* Normal exit, no error */
692 ERR("Health error occurred in %s", __func__
);
694 health_unregister(health_relayd
);
695 DBG("Live viewer dispatch thread dying");
696 if (lttng_relay_stop_threads()) {
697 ERR("Error stopping threads");
703 * Establish connection with the viewer and check the versions.
705 * Return 0 on success or else negative value.
708 int viewer_connect(struct relay_connection
*conn
)
711 struct lttng_viewer_connect reply
, msg
;
713 conn
->version_check_done
= 1;
715 health_code_update();
717 DBG("Viewer is establishing a connection to the relayd.");
719 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
724 health_code_update();
726 memset(&reply
, 0, sizeof(reply
));
727 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
728 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
730 /* Major versions must be the same */
731 if (reply
.major
!= be32toh(msg
.major
)) {
732 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
733 reply
.major
, be32toh(msg
.major
));
738 conn
->major
= reply
.major
;
739 /* We adapt to the lowest compatible version */
740 if (reply
.minor
<= be32toh(msg
.minor
)) {
741 conn
->minor
= reply
.minor
;
743 conn
->minor
= be32toh(msg
.minor
);
746 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
747 conn
->type
= RELAY_VIEWER_COMMAND
;
748 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
749 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
751 ERR("Unknown connection type : %u", be32toh(msg
.type
));
756 reply
.major
= htobe32(reply
.major
);
757 reply
.minor
= htobe32(reply
.minor
);
758 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
760 * Increment outside of htobe64 macro, because the argument can
761 * be used more than once within the macro, and thus the
762 * operation may be undefined.
764 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
765 last_relay_viewer_session_id
++;
766 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
767 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
770 health_code_update();
772 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
777 health_code_update();
779 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
787 * Send the viewer the list of current sessions.
788 * We need to create a copy of the hash table content because otherwise
789 * we cannot assume the number of entries stays the same between getting
790 * the number of HT elements and iteration over the HT.
792 * Return 0 on success or else a negative value.
795 int viewer_list_sessions(struct relay_connection
*conn
)
798 struct lttng_viewer_list_sessions session_list
;
799 struct lttng_ht_iter iter
;
800 struct relay_session
*session
;
801 struct lttng_viewer_session
*send_session_buf
= NULL
;
802 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
805 DBG("List sessions received");
807 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
808 if (!send_session_buf
) {
813 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
815 struct lttng_viewer_session
*send_session
;
817 health_code_update();
819 if (count
>= buf_count
) {
820 struct lttng_viewer_session
*newbuf
;
821 uint32_t new_buf_count
= buf_count
<< 1;
823 newbuf
= realloc(send_session_buf
,
824 new_buf_count
* sizeof(*send_session_buf
));
830 send_session_buf
= newbuf
;
831 buf_count
= new_buf_count
;
833 send_session
= &send_session_buf
[count
];
834 strncpy(send_session
->session_name
, session
->session_name
,
835 sizeof(send_session
->session_name
));
836 strncpy(send_session
->hostname
, session
->hostname
,
837 sizeof(send_session
->hostname
));
838 send_session
->id
= htobe64(session
->id
);
839 send_session
->live_timer
= htobe32(session
->live_timer
);
840 if (session
->viewer_attached
) {
841 send_session
->clients
= htobe32(1);
843 send_session
->clients
= htobe32(0);
845 send_session
->streams
= htobe32(session
->stream_count
);
850 session_list
.sessions_count
= htobe32(count
);
852 health_code_update();
854 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
859 health_code_update();
861 ret
= send_response(conn
->sock
, send_session_buf
,
862 count
* sizeof(*send_session_buf
));
866 health_code_update();
870 free(send_session_buf
);
875 * Send the viewer the list of current streams.
878 int viewer_get_new_streams(struct relay_connection
*conn
)
880 int ret
, send_streams
= 0;
881 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
882 struct lttng_viewer_new_streams_request request
;
883 struct lttng_viewer_new_streams_response response
;
884 struct relay_session
*session
;
890 DBG("Get new streams received");
892 health_code_update();
894 /* Receive the request from the connected client. */
895 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
899 session_id
= be64toh(request
.session_id
);
901 health_code_update();
903 memset(&response
, 0, sizeof(response
));
905 session
= session_get_by_id(session_id
);
907 DBG("Relay session %" PRIu64
" not found", session_id
);
908 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
912 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
914 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
919 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
921 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
922 &nb_created
, &closed
);
924 goto end_put_session
;
926 /* Only send back the newly created streams with the unsent ones. */
927 nb_streams
= nb_created
+ nb_unsent
;
928 response
.streams_count
= htobe32(nb_streams
);
931 * If the session is closed, HUP when there are no more streams
934 if (closed
&& nb_total
== 0) {
936 response
.streams_count
= 0;
937 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
942 health_code_update();
943 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
945 goto end_put_session
;
947 health_code_update();
950 * Unknown or empty session, just return gracefully, the viewer
951 * knows what is happening.
953 if (!send_streams
|| !nb_streams
) {
955 goto end_put_session
;
959 * Send stream and *DON'T* ignore the sent flag so every viewer
960 * streams that were not sent from that point will be sent to
963 ret
= send_viewer_streams(conn
->sock
, session
, 0);
965 goto end_put_session
;
970 session_put(session
);
977 * Send the viewer the list of current sessions.
980 int viewer_attach_session(struct relay_connection
*conn
)
982 int send_streams
= 0;
984 uint32_t nb_streams
= 0;
985 enum lttng_viewer_seek seek_type
;
986 struct lttng_viewer_attach_session_request request
;
987 struct lttng_viewer_attach_session_response response
;
988 struct relay_session
*session
= NULL
;
993 health_code_update();
995 /* Receive the request from the connected client. */
996 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1001 health_code_update();
1003 memset(&response
, 0, sizeof(response
));
1005 if (!conn
->viewer_session
) {
1006 DBG("Client trying to attach before creating a live viewer session");
1007 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1011 session
= session_get_by_id(be64toh(request
.session_id
));
1013 DBG("Relay session %" PRIu64
" not found",
1014 be64toh(request
.session_id
));
1015 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1018 DBG("Attach session ID %" PRIu64
" received",
1019 be64toh(request
.session_id
));
1021 if (session
->live_timer
== 0) {
1022 DBG("Not live session");
1023 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1028 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1030 DBG("Already a viewer attached");
1031 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1035 switch (be32toh(request
.seek
)) {
1036 case LTTNG_VIEWER_SEEK_BEGINNING
:
1037 case LTTNG_VIEWER_SEEK_LAST
:
1038 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1039 seek_type
= be32toh(request
.seek
);
1042 ERR("Wrong seek parameter");
1043 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1048 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1051 goto end_put_session
;
1053 response
.streams_count
= htobe32(nb_streams
);
1056 * If the session is closed when the viewer is attaching, it
1057 * means some of the streams may have been concurrently removed,
1058 * so we don't allow the viewer to attach, even if there are
1059 * streams available.
1063 response
.streams_count
= 0;
1064 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1069 health_code_update();
1070 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1072 goto end_put_session
;
1074 health_code_update();
1077 * Unknown or empty session, just return gracefully, the viewer
1078 * knows what is happening.
1080 if (!send_streams
|| !nb_streams
) {
1082 goto end_put_session
;
1085 /* Send stream and ignore the sent flag. */
1086 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1088 goto end_put_session
;
1093 session_put(session
);
1100 * Open the index file if needed for the given vstream.
1102 * If an index file is successfully opened, the vstream index_fd set with
1105 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1107 * Called with rstream lock held.
1109 static int try_open_index(struct relay_viewer_stream
*vstream
,
1110 struct relay_stream
*rstream
)
1114 if (vstream
->index_fd
) {
1119 * First time, we open the index file and at least one index is ready.
1121 if (rstream
->index_received_seqcount
== 0) {
1125 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1126 vstream
->stream
->tracefile_count
,
1127 vstream
->current_tracefile_id
);
1129 vstream
->index_fd
= stream_fd_create(ret
);
1130 if (!vstream
->index_fd
) {
1146 * Check the status of the index for the given stream. This function
1147 * updates the index structure if needed and can put (close) the vstream
1148 * in the HUP situation.
1150 * Return 0 means that we can proceed with the index. A value of 1 means
1151 * that the index has been updated and is ready to be sent to the
1152 * client. A negative value indicates an error that can't be handled.
1154 * Called with rstream lock held.
1156 static int check_index_status(struct relay_viewer_stream
*vstream
,
1157 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1158 struct lttng_viewer_index
*index
)
1162 if (trace
->session
->connection_closed
1163 && rstream
->index_received_seqcount
1164 == vstream
->index_sent_seqcount
) {
1165 /* Last index sent and session connection is closed. */
1166 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1168 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1169 rstream
->index_received_seqcount
1170 == vstream
->index_sent_seqcount
) {
1172 * We've received a synchronization beacon and the last index
1173 * available has been sent, the index for now is inactive.
1175 * In this case, we have received a beacon which allows us to
1176 * inform the client of a time interval during which we can
1177 * guarantee that there are no events to read (and never will
1180 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1181 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1182 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1184 } else if (rstream
->index_received_seqcount
1185 == vstream
->index_sent_seqcount
) {
1187 * This checks whether received == sent seqcount. In
1188 * this case, we have not received a beacon. Therefore,
1189 * we can only ask the client to retry later.
1191 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1193 } else if (!tracefile_array_seq_in_file(rstream
->tfa
,
1194 vstream
->current_tracefile_id
,
1195 vstream
->index_sent_seqcount
)) {
1197 * The next index we want to send cannot be read either
1198 * because we need to perform a rotation, or due to
1199 * the producer having overwritten its trace file.
1201 DBG("Viewer stream %" PRIu64
" rotation",
1202 vstream
->stream
->stream_handle
);
1203 ret
= viewer_stream_rotate(vstream
);
1206 } else if (ret
== 1) {
1207 /* EOF across entire stream. */
1208 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1212 * If we have been pushed due to overwrite, it
1213 * necessarily means there is data that can be read in
1214 * the stream. If we rotated because we reached the end
1215 * of a tracefile, it means the following tracefile
1216 * needs to contain at least one index, else we would
1217 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1218 * viewer. The updated index_sent_seqcount needs to
1219 * point to a readable index entry now.
1221 * In the case where we "rotate" on a single file, we
1222 * can end up in a case where the requested index is
1223 * still unavailable.
1225 if (rstream
->tracefile_count
== 1 &&
1226 !tracefile_array_seq_in_file(
1228 vstream
->current_tracefile_id
,
1229 vstream
->index_sent_seqcount
)) {
1230 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1233 assert(tracefile_array_seq_in_file(rstream
->tfa
,
1234 vstream
->current_tracefile_id
,
1235 vstream
->index_sent_seqcount
));
1237 /* ret == 0 means successful so we continue. */
1243 viewer_stream_put(vstream
);
1249 * Send the next index for a stream.
1251 * Return 0 on success or else a negative value.
1254 int viewer_get_next_index(struct relay_connection
*conn
)
1258 struct lttng_viewer_get_next_index request_index
;
1259 struct lttng_viewer_index viewer_index
;
1260 struct ctf_packet_index packet_index
;
1261 struct relay_viewer_stream
*vstream
= NULL
;
1262 struct relay_stream
*rstream
= NULL
;
1263 struct ctf_trace
*ctf_trace
= NULL
;
1264 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1268 DBG("Viewer get next index");
1270 memset(&viewer_index
, 0, sizeof(viewer_index
));
1271 health_code_update();
1273 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1277 health_code_update();
1279 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1281 DBG("Client requested index of unknown stream id %" PRIu64
,
1282 be64toh(request_index
.stream_id
));
1283 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1287 /* Use back. ref. Protected by refcounts. */
1288 rstream
= vstream
->stream
;
1289 ctf_trace
= rstream
->trace
;
1291 /* metadata_viewer_stream may be NULL. */
1292 metadata_viewer_stream
=
1293 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1295 pthread_mutex_lock(&rstream
->lock
);
1298 * The viewer should not ask for index on metadata stream.
1300 if (rstream
->is_metadata
) {
1301 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1305 /* Try to open an index if one is needed for that stream. */
1306 ret
= try_open_index(vstream
, rstream
);
1308 if (ret
== -ENOENT
) {
1310 * The index is created only when the first data
1311 * packet arrives, it might not be ready at the
1312 * beginning of the session
1314 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1316 /* Unhandled error. */
1317 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1322 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1325 } else if (ret
== 1) {
1327 * We have no index to send and check_index_status has populated
1328 * viewer_index's status.
1332 /* At this point, ret is 0 thus we will be able to read the index. */
1336 * vstream->stream_fd may be NULL if it has been closed by
1337 * tracefile rotation, or if we are at the beginning of the
1338 * stream. We open the data stream file here to protect against
1339 * overwrite caused by tracefile rotation (in association with
1340 * unlink performed before overwrite).
1342 if (!vstream
->stream_fd
) {
1343 char fullpath
[PATH_MAX
];
1345 if (vstream
->stream
->tracefile_count
> 0) {
1346 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1348 vstream
->channel_name
,
1349 vstream
->current_tracefile_id
);
1351 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1353 vstream
->channel_name
);
1358 ret
= open(fullpath
, O_RDONLY
);
1360 PERROR("Relay opening trace file");
1363 vstream
->stream_fd
= stream_fd_create(ret
);
1364 if (!vstream
->stream_fd
) {
1372 ret
= check_new_streams(conn
);
1374 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1376 } else if (ret
== 1) {
1377 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1380 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1381 sizeof(packet_index
));
1382 if (read_ret
< sizeof(packet_index
)) {
1383 ERR("Relay reading index file %d returned %zd",
1384 vstream
->index_fd
->fd
, read_ret
);
1385 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1388 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1389 vstream
->index_sent_seqcount
++;
1393 * Indexes are stored in big endian, no need to switch before sending.
1395 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1396 rstream
->stream_handle
,
1397 be64toh(packet_index
.offset
));
1398 viewer_index
.offset
= packet_index
.offset
;
1399 viewer_index
.packet_size
= packet_index
.packet_size
;
1400 viewer_index
.content_size
= packet_index
.content_size
;
1401 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1402 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1403 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1404 viewer_index
.stream_id
= packet_index
.stream_id
;
1408 pthread_mutex_unlock(&rstream
->lock
);
1411 if (metadata_viewer_stream
) {
1412 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1413 DBG("get next index metadata check: recv %" PRIu64
1415 metadata_viewer_stream
->stream
->metadata_received
,
1416 metadata_viewer_stream
->metadata_sent
);
1417 if (!metadata_viewer_stream
->stream
->metadata_received
||
1418 metadata_viewer_stream
->stream
->metadata_received
>
1419 metadata_viewer_stream
->metadata_sent
) {
1420 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1422 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1425 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1426 health_code_update();
1428 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1432 health_code_update();
1435 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1436 vstream
->index_sent_seqcount
,
1437 vstream
->stream
->stream_handle
);
1440 if (metadata_viewer_stream
) {
1441 viewer_stream_put(metadata_viewer_stream
);
1444 viewer_stream_put(vstream
);
1449 pthread_mutex_unlock(&rstream
->lock
);
1450 if (metadata_viewer_stream
) {
1451 viewer_stream_put(metadata_viewer_stream
);
1453 viewer_stream_put(vstream
);
1458 * Send the next index for a stream
1460 * Return 0 on success or else a negative value.
1463 int viewer_get_packet(struct relay_connection
*conn
)
1465 int ret
, send_data
= 0;
1469 struct lttng_viewer_get_packet get_packet_info
;
1470 struct lttng_viewer_trace_packet reply
;
1471 struct relay_viewer_stream
*vstream
= NULL
;
1473 DBG2("Relay get data packet");
1475 health_code_update();
1477 ret
= recv_request(conn
->sock
, &get_packet_info
,
1478 sizeof(get_packet_info
));
1482 health_code_update();
1484 /* From this point on, the error label can be reached. */
1485 memset(&reply
, 0, sizeof(reply
));
1487 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1489 DBG("Client requested packet of unknown stream id %" PRIu64
,
1490 be64toh(get_packet_info
.stream_id
));
1491 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1492 goto send_reply_nolock
;
1495 pthread_mutex_lock(&vstream
->stream
->lock
);
1497 len
= be32toh(get_packet_info
.len
);
1498 data
= zmalloc(len
);
1500 PERROR("relay data zmalloc");
1504 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1507 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1508 be64toh(get_packet_info
.offset
));
1511 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1512 if (read_len
< len
) {
1513 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1514 vstream
->stream_fd
->fd
,
1515 be64toh(get_packet_info
.offset
));
1518 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1519 reply
.len
= htobe32(len
);
1524 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1528 pthread_mutex_unlock(&vstream
->stream
->lock
);
1531 reply
.flags
= htobe32(reply
.flags
);
1533 health_code_update();
1535 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1539 health_code_update();
1542 health_code_update();
1543 ret
= send_response(conn
->sock
, data
, len
);
1547 health_code_update();
1550 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1551 be64toh(get_packet_info
.stream_id
));
1557 viewer_stream_put(vstream
);
1563 * Send the session's metadata
1565 * Return 0 on success else a negative value.
1568 int viewer_get_metadata(struct relay_connection
*conn
)
1574 struct lttng_viewer_get_metadata request
;
1575 struct lttng_viewer_metadata_packet reply
;
1576 struct relay_viewer_stream
*vstream
= NULL
;
1580 DBG("Relay get metadata");
1582 health_code_update();
1584 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1588 health_code_update();
1590 memset(&reply
, 0, sizeof(reply
));
1592 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1595 * The metadata stream can be closed by a CLOSE command
1596 * just before we attach. It can also be closed by
1597 * per-pid tracing during tracing. Therefore, it is
1598 * possible that we cannot find this viewer stream.
1599 * Reply back to the client with an error if we cannot
1602 DBG("Client requested metadata of unknown stream id %" PRIu64
,
1603 be64toh(request
.stream_id
));
1604 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1607 pthread_mutex_lock(&vstream
->stream
->lock
);
1608 if (!vstream
->stream
->is_metadata
) {
1609 ERR("Invalid metadata stream");
1613 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1615 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1617 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1621 /* first time, we open the metadata file */
1622 if (!vstream
->stream_fd
) {
1623 char fullpath
[PATH_MAX
];
1625 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1626 vstream
->channel_name
);
1630 ret
= open(fullpath
, O_RDONLY
);
1632 PERROR("Relay opening metadata file");
1635 vstream
->stream_fd
= stream_fd_create(ret
);
1636 if (!vstream
->stream_fd
) {
1644 reply
.len
= htobe64(len
);
1645 data
= zmalloc(len
);
1647 PERROR("viewer metadata zmalloc");
1651 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1652 if (read_len
< len
) {
1653 PERROR("Relay reading metadata file");
1656 vstream
->metadata_sent
+= read_len
;
1657 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1658 && vstream
->stream
->closed
) {
1659 /* Release ownership for the viewer metadata stream. */
1660 viewer_stream_put(vstream
);
1663 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1668 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1671 health_code_update();
1673 pthread_mutex_unlock(&vstream
->stream
->lock
);
1675 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1679 health_code_update();
1682 ret
= send_response(conn
->sock
, data
, len
);
1688 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1689 be64toh(request
.stream_id
));
1691 DBG("Metadata sent");
1697 viewer_stream_put(vstream
);
1703 * Create a viewer session.
1705 * Return 0 on success or else a negative value.
1708 int viewer_create_session(struct relay_connection
*conn
)
1711 struct lttng_viewer_create_session_response resp
;
1713 DBG("Viewer create session received");
1715 memset(&resp
, 0, sizeof(resp
));
1716 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1717 conn
->viewer_session
= viewer_session_create();
1718 if (!conn
->viewer_session
) {
1719 ERR("Allocation viewer session");
1720 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1725 health_code_update();
1726 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1730 health_code_update();
1738 * Detach a viewer session.
1740 * Return 0 on success or else a negative value.
1743 int viewer_detach_session(struct relay_connection
*conn
)
1746 struct lttng_viewer_detach_session_response response
;
1747 struct lttng_viewer_detach_session_request request
;
1748 struct relay_session
*session
= NULL
;
1749 uint64_t viewer_session_to_close
;
1751 DBG("Viewer detach session received");
1755 health_code_update();
1757 /* Receive the request from the connected client. */
1758 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1762 viewer_session_to_close
= be64toh(request
.session_id
);
1764 if (!conn
->viewer_session
) {
1765 DBG("Client trying to detach before creating a live viewer session");
1766 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR
);
1770 health_code_update();
1772 memset(&response
, 0, sizeof(response
));
1773 DBG("Detaching from session ID %" PRIu64
, viewer_session_to_close
);
1775 session
= session_get_by_id(be64toh(request
.session_id
));
1777 DBG("Relay session %" PRIu64
" not found",
1778 be64toh(request
.session_id
));
1779 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_UNK
);
1783 ret
= viewer_session_is_attached(conn
->viewer_session
, session
);
1785 DBG("Not attached to this session");
1786 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_ERR
);
1787 goto send_reply_put
;
1790 viewer_session_close_one_session(conn
->viewer_session
, session
);
1791 response
.status
= htobe32(LTTNG_VIEWER_DETACH_SESSION_OK
);
1792 DBG("Session %" PRIu64
" detached.", viewer_session_to_close
);
1795 session_put(session
);
1798 health_code_update();
1799 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1803 health_code_update();
1811 * live_relay_unknown_command: send -1 if received unknown command
1814 void live_relay_unknown_command(struct relay_connection
*conn
)
1816 struct lttcomm_relayd_generic_reply reply
;
1818 memset(&reply
, 0, sizeof(reply
));
1819 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1820 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1824 * Process the commands received on the control socket
1827 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1828 struct relay_connection
*conn
)
1833 msg_value
= be32toh(recv_hdr
->cmd
);
1836 * Make sure we've done the version check before any command other then a
1837 * new client connection.
1839 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1840 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1845 switch (msg_value
) {
1846 case LTTNG_VIEWER_CONNECT
:
1847 ret
= viewer_connect(conn
);
1849 case LTTNG_VIEWER_LIST_SESSIONS
:
1850 ret
= viewer_list_sessions(conn
);
1852 case LTTNG_VIEWER_ATTACH_SESSION
:
1853 ret
= viewer_attach_session(conn
);
1855 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1856 ret
= viewer_get_next_index(conn
);
1858 case LTTNG_VIEWER_GET_PACKET
:
1859 ret
= viewer_get_packet(conn
);
1861 case LTTNG_VIEWER_GET_METADATA
:
1862 ret
= viewer_get_metadata(conn
);
1864 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1865 ret
= viewer_get_new_streams(conn
);
1867 case LTTNG_VIEWER_CREATE_SESSION
:
1868 ret
= viewer_create_session(conn
);
1870 case LTTNG_VIEWER_DETACH_SESSION
:
1871 ret
= viewer_detach_session(conn
);
1874 ERR("Received unknown viewer command (%u)",
1875 be32toh(recv_hdr
->cmd
));
1876 live_relay_unknown_command(conn
);
1886 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1890 (void) lttng_poll_del(events
, pollfd
);
1892 ret
= close(pollfd
);
1894 ERR("Closing pollfd %d", pollfd
);
1899 * This thread does the actual work
1902 void *thread_worker(void *data
)
1906 struct lttng_poll_event events
;
1907 struct lttng_ht
*viewer_connections_ht
;
1908 struct lttng_ht_iter iter
;
1909 struct lttng_viewer_cmd recv_hdr
;
1910 struct relay_connection
*destroy_conn
;
1912 DBG("[thread] Live viewer relay worker started");
1914 rcu_register_thread();
1916 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1918 if (testpoint(relayd_thread_live_worker
)) {
1919 goto error_testpoint
;
1922 /* table of connections indexed on socket */
1923 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1924 if (!viewer_connections_ht
) {
1925 goto viewer_connections_ht_error
;
1928 ret
= create_thread_poll_set(&events
, 2);
1930 goto error_poll_create
;
1933 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1942 health_code_update();
1944 /* Infinite blocking call, waiting for transmission */
1945 DBG3("Relayd live viewer worker thread polling...");
1946 health_poll_entry();
1947 ret
= lttng_poll_wait(&events
, -1);
1951 * Restart interrupted system call.
1953 if (errno
== EINTR
) {
1962 * Process control. The control connection is prioritised so we don't
1963 * starve it with high throughput tracing data on the data
1966 for (i
= 0; i
< nb_fd
; i
++) {
1967 /* Fetch once the poll data */
1968 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1969 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1971 health_code_update();
1974 /* No activity for this FD (poll implementation). */
1978 /* Thread quit pipe has been closed. Killing thread. */
1979 ret
= check_thread_quit_pipe(pollfd
, revents
);
1985 /* Inspect the relay conn pipe for new connection. */
1986 if (pollfd
== live_conn_pipe
[0]) {
1987 if (revents
& LPOLLIN
) {
1988 struct relay_connection
*conn
;
1990 ret
= lttng_read(live_conn_pipe
[0],
1991 &conn
, sizeof(conn
));
1995 lttng_poll_add(&events
, conn
->sock
->fd
,
1996 LPOLLIN
| LPOLLRDHUP
);
1997 connection_ht_add(viewer_connections_ht
, conn
);
1998 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1999 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2000 ERR("Relay live pipe error");
2003 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2007 /* Connection activity. */
2008 struct relay_connection
*conn
;
2010 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
2015 if (revents
& LPOLLIN
) {
2016 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
2017 sizeof(recv_hdr
), 0);
2019 /* Connection closed. */
2020 cleanup_connection_pollfd(&events
, pollfd
);
2021 /* Put "create" ownership reference. */
2022 connection_put(conn
);
2023 DBG("Viewer control conn closed with %d", pollfd
);
2025 ret
= process_control(&recv_hdr
, conn
);
2027 /* Clear the session on error. */
2028 cleanup_connection_pollfd(&events
, pollfd
);
2029 /* Put "create" ownership reference. */
2030 connection_put(conn
);
2031 DBG("Viewer connection closed with %d", pollfd
);
2034 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2035 cleanup_connection_pollfd(&events
, pollfd
);
2036 /* Put "create" ownership reference. */
2037 connection_put(conn
);
2039 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2040 connection_put(conn
);
2043 /* Put local "get_by_sock" reference. */
2044 connection_put(conn
);
2051 lttng_poll_clean(&events
);
2053 /* Cleanup reamaining connection object. */
2055 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
2058 health_code_update();
2059 connection_put(destroy_conn
);
2063 lttng_ht_destroy(viewer_connections_ht
);
2064 viewer_connections_ht_error
:
2065 /* Close relay conn pipes */
2066 utils_close_pipe(live_conn_pipe
);
2068 DBG("Viewer worker thread exited with error");
2070 DBG("Viewer worker thread cleanup complete");
2074 ERR("Health error occurred in %s", __func__
);
2076 health_unregister(health_relayd
);
2077 if (lttng_relay_stop_threads()) {
2078 ERR("Error stopping threads");
2080 rcu_unregister_thread();
2085 * Create the relay command pipe to wake thread_manage_apps.
2086 * Closed in cleanup().
2088 static int create_conn_pipe(void)
2090 return utils_create_pipe_cloexec(live_conn_pipe
);
2093 int relayd_live_join(void)
2095 int ret
, retval
= 0;
2098 ret
= pthread_join(live_listener_thread
, &status
);
2101 PERROR("pthread_join live listener");
2105 ret
= pthread_join(live_worker_thread
, &status
);
2108 PERROR("pthread_join live worker");
2112 ret
= pthread_join(live_dispatcher_thread
, &status
);
2115 PERROR("pthread_join live dispatcher");
2119 cleanup_relayd_live();
2127 int relayd_live_create(struct lttng_uri
*uri
)
2129 int ret
= 0, retval
= 0;
2135 goto exit_init_data
;
2139 /* Check if daemon is UID = 0 */
2140 is_root
= !getuid();
2143 if (live_uri
->port
< 1024) {
2144 ERR("Need to be root to use ports < 1024");
2146 goto exit_init_data
;
2150 /* Setup the thread apps communication pipe. */
2151 if (create_conn_pipe()) {
2153 goto exit_init_data
;
2156 /* Init relay command queue. */
2157 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2159 /* Set up max poll set size */
2160 if (lttng_poll_set_max_size()) {
2162 goto exit_init_data
;
2165 /* Setup the dispatcher thread */
2166 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2167 thread_dispatcher
, (void *) NULL
);
2170 PERROR("pthread_create viewer dispatcher");
2172 goto exit_dispatcher_thread
;
2175 /* Setup the worker thread */
2176 ret
= pthread_create(&live_worker_thread
, NULL
,
2177 thread_worker
, NULL
);
2180 PERROR("pthread_create viewer worker");
2182 goto exit_worker_thread
;
2185 /* Setup the listener thread */
2186 ret
= pthread_create(&live_listener_thread
, NULL
,
2187 thread_listener
, (void *) NULL
);
2190 PERROR("pthread_create viewer listener");
2192 goto exit_listener_thread
;
2196 * All OK, started all threads.
2201 * Join on the live_listener_thread should anything be added after
2202 * the live_listener thread's creation.
2205 exit_listener_thread
:
2207 ret
= pthread_join(live_worker_thread
, &status
);
2210 PERROR("pthread_join live worker");
2215 ret
= pthread_join(live_dispatcher_thread
, &status
);
2218 PERROR("pthread_join live dispatcher");
2221 exit_dispatcher_thread
:
2224 cleanup_relayd_live();