2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
38 #include <urcu/futex.h>
39 #include <urcu/uatomic.h>
40 #include <urcu/rculist.h>
45 #include <lttng/lttng.h>
46 #include <common/common.h>
47 #include <common/compat/poll.h>
48 #include <common/compat/socket.h>
49 #include <common/compat/endian.h>
50 #include <common/defaults.h>
51 #include <common/futex.h>
52 #include <common/index/index.h>
53 #include <common/sessiond-comm/sessiond-comm.h>
54 #include <common/sessiond-comm/inet.h>
55 #include <common/sessiond-comm/relayd.h>
56 #include <common/uri.h>
57 #include <common/utils.h>
61 #include "lttng-relayd.h"
63 #include "health-relayd.h"
64 #include "testpoint.h"
65 #include "viewer-stream.h"
68 #include "ctf-trace.h"
69 #include "connection.h"
70 #include "viewer-session.h"
72 #define SESSION_BUF_DEFAULT_COUNT 16
74 static struct lttng_uri
*live_uri
;
77 * This pipe is used to inform the worker thread that a command is queued and
78 * ready to be processed.
80 static int live_conn_pipe
[2] = { -1, -1 };
82 /* Shared between threads */
83 static int live_dispatch_thread_exit
;
85 static pthread_t live_listener_thread
;
86 static pthread_t live_dispatcher_thread
;
87 static pthread_t live_worker_thread
;
90 * Relay command queue.
92 * The live_thread_listener and live_thread_dispatcher communicate with this
95 static struct relay_conn_queue viewer_conn_queue
;
97 static uint64_t last_relay_viewer_session_id
;
98 static pthread_mutex_t last_relay_viewer_session_id_lock
=
99 PTHREAD_MUTEX_INITIALIZER
;
105 void cleanup_relayd_live(void)
113 * Receive a request buffer using a given socket, destination allocated buffer
116 * Return the size of the received message or else a negative value on error
117 * with errno being set by recvmsg() syscall.
120 ssize_t
recv_request(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
124 ret
= sock
->ops
->recvmsg(sock
, buf
, size
, 0);
125 if (ret
< 0 || ret
!= size
) {
127 /* Orderly shutdown. Not necessary to print an error. */
128 DBG("Socket %d did an orderly shutdown", sock
->fd
);
130 ERR("Relay failed to receive request.");
139 * Send a response buffer using a given socket, source allocated buffer of
142 * Return the size of the sent message or else a negative value on error with
143 * errno being set by sendmsg() syscall.
146 ssize_t
send_response(struct lttcomm_sock
*sock
, void *buf
, size_t size
)
150 ret
= sock
->ops
->sendmsg(sock
, buf
, size
, 0);
152 ERR("Relayd failed to send response.");
159 * Atomically check if new streams got added in one of the sessions attached
160 * and reset the flag to 0.
162 * Returns 1 if new streams got added, 0 if nothing changed, a negative value
166 int check_new_streams(struct relay_connection
*conn
)
168 struct relay_session
*session
;
169 unsigned long current_val
;
172 if (!conn
->viewer_session
) {
176 cds_list_for_each_entry_rcu(session
,
177 &conn
->viewer_session
->session_list
,
178 viewer_session_node
) {
179 if (!session_get(session
)) {
182 current_val
= uatomic_cmpxchg(&session
->new_streams
, 1, 0);
184 session_put(session
);
195 * Send viewer streams to the given socket. The ignore_sent_flag indicates if
196 * this function should ignore the sent flag or not.
198 * Return 0 on success or else a negative value.
201 ssize_t
send_viewer_streams(struct lttcomm_sock
*sock
,
202 struct relay_session
*session
, unsigned int ignore_sent_flag
)
205 struct lttng_viewer_stream send_stream
;
206 struct lttng_ht_iter iter
;
207 struct relay_viewer_stream
*vstream
;
211 cds_lfht_for_each_entry(viewer_streams_ht
->ht
, &iter
.iter
, vstream
,
213 struct ctf_trace
*ctf_trace
;
215 health_code_update();
217 if (!viewer_stream_get(vstream
)) {
221 pthread_mutex_lock(&vstream
->stream
->lock
);
222 /* Ignore if not the same session. */
223 if (vstream
->stream
->trace
->session
->id
!= session
->id
||
224 (!ignore_sent_flag
&& vstream
->sent_flag
)) {
225 pthread_mutex_unlock(&vstream
->stream
->lock
);
226 viewer_stream_put(vstream
);
230 ctf_trace
= vstream
->stream
->trace
;
231 send_stream
.id
= htobe64(vstream
->stream
->stream_handle
);
232 send_stream
.ctf_trace_id
= htobe64(ctf_trace
->id
);
233 send_stream
.metadata_flag
= htobe32(
234 vstream
->stream
->is_metadata
);
235 strncpy(send_stream
.path_name
, vstream
->path_name
,
236 sizeof(send_stream
.path_name
));
237 strncpy(send_stream
.channel_name
, vstream
->channel_name
,
238 sizeof(send_stream
.channel_name
));
240 DBG("Sending stream %" PRIu64
" to viewer",
241 vstream
->stream
->stream_handle
);
242 vstream
->sent_flag
= 1;
243 pthread_mutex_unlock(&vstream
->stream
->lock
);
245 ret
= send_response(sock
, &send_stream
, sizeof(send_stream
));
246 viewer_stream_put(vstream
);
260 * Create every viewer stream possible for the given session with the seek
261 * type. Three counters *can* be return which are in order the total amount of
262 * viewer stream of the session, the number of unsent stream and the number of
263 * stream created. Those counters can be NULL and thus will be ignored.
265 * Return 0 on success or else a negative value.
268 int make_viewer_streams(struct relay_session
*session
,
269 enum lttng_viewer_seek seek_t
, uint32_t *nb_total
, uint32_t *nb_unsent
,
270 uint32_t *nb_created
, bool *closed
)
273 struct lttng_ht_iter iter
;
274 struct ctf_trace
*ctf_trace
;
279 * Hold the session lock to ensure that we see either none or
280 * all initial streams for a session, but no intermediate state.
282 pthread_mutex_lock(&session
->lock
);
284 if (session
->connection_closed
) {
289 * Create viewer streams for relay streams that are ready to be
290 * used for a the given session id only.
293 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
295 struct relay_stream
*stream
;
297 health_code_update();
299 if (!ctf_trace_get(ctf_trace
)) {
303 cds_list_for_each_entry_rcu(stream
, &ctf_trace
->stream_list
, stream_node
) {
304 struct relay_viewer_stream
*vstream
;
306 if (!stream_get(stream
)) {
310 * stream published is protected by the session
313 if (!stream
->published
) {
317 * Stream has no data, don't consider it yet.
319 if (stream
->is_metadata
) {
320 if (!stream
->metadata_received
) {
324 if (stream
->prev_seq
== -1ULL) {
328 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
330 vstream
= viewer_stream_create(stream
, seek_t
);
333 ctf_trace_put(ctf_trace
);
339 /* Update number of created stream counter. */
343 * Ensure a self-reference is preserved even
344 * after we have put our local reference.
346 viewer_stream_get(vstream
);
348 if (!vstream
->sent_flag
&& nb_unsent
) {
349 /* Update number of unsent stream counter. */
353 /* Update number of total stream counter. */
355 if (stream
->is_metadata
) {
356 if (!stream
->closed
||
357 stream
->metadata_received
> vstream
->metadata_sent
) {
361 if (!stream
->closed
||
362 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
368 /* Put local reference. */
369 viewer_stream_put(vstream
);
373 ctf_trace_put(ctf_trace
);
380 pthread_mutex_unlock(&session
->lock
);
384 int relayd_live_stop(void)
386 /* Stop dispatch thread */
387 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
388 futex_nto1_wake(&viewer_conn_queue
.futex
);
393 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
396 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
400 if (events
== NULL
|| size
== 0) {
405 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
411 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
423 * Check if the thread quit pipe was triggered.
425 * Return 1 if it was triggered else 0;
428 int check_thread_quit_pipe(int fd
, uint32_t events
)
430 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
438 * Create and init socket from uri.
441 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
444 struct lttcomm_sock
*sock
= NULL
;
446 sock
= lttcomm_alloc_sock_from_uri(uri
);
448 ERR("Allocating socket");
452 ret
= lttcomm_create_sock(sock
);
456 DBG("Listening on sock %d for live", sock
->fd
);
458 ret
= sock
->ops
->bind(sock
);
463 ret
= sock
->ops
->listen(sock
, -1);
473 lttcomm_destroy_sock(sock
);
479 * This thread manages the listening for new connections on the network
482 void *thread_listener(void *data
)
484 int i
, ret
, pollfd
, err
= -1;
485 uint32_t revents
, nb_fd
;
486 struct lttng_poll_event events
;
487 struct lttcomm_sock
*live_control_sock
;
489 DBG("[thread] Relay live listener started");
491 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
493 health_code_update();
495 live_control_sock
= init_socket(live_uri
);
496 if (!live_control_sock
) {
497 goto error_sock_control
;
500 /* Pass 2 as size here for the thread quit pipe and control sockets. */
501 ret
= create_thread_poll_set(&events
, 2);
503 goto error_create_poll
;
506 /* Add the control socket */
507 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
512 lttng_relay_notify_ready();
514 if (testpoint(relayd_thread_live_listener
)) {
515 goto error_testpoint
;
519 health_code_update();
521 DBG("Listener accepting live viewers connections");
525 ret
= lttng_poll_wait(&events
, -1);
529 * Restart interrupted system call.
531 if (errno
== EINTR
) {
538 DBG("Relay new viewer connection received");
539 for (i
= 0; i
< nb_fd
; i
++) {
540 health_code_update();
542 /* Fetch once the poll data */
543 revents
= LTTNG_POLL_GETEV(&events
, i
);
544 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
547 /* No activity for this FD (poll implementation). */
551 /* Thread quit pipe has been closed. Killing thread. */
552 ret
= check_thread_quit_pipe(pollfd
, revents
);
558 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
559 ERR("socket poll error");
561 } else if (revents
& LPOLLIN
) {
563 * A new connection is requested, therefore a
564 * viewer connection is allocated in this
565 * thread, enqueued to a global queue and
566 * dequeued (and freed) in the worker thread.
569 struct relay_connection
*new_conn
;
570 struct lttcomm_sock
*newsock
;
572 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
574 PERROR("accepting control sock");
577 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
579 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
582 PERROR("setsockopt inet");
583 lttcomm_destroy_sock(newsock
);
586 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
588 lttcomm_destroy_sock(newsock
);
591 /* Ownership assumed by the connection. */
594 /* Enqueue request for the dispatcher thread. */
595 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
599 * Wake the dispatch queue futex.
600 * Implicit memory barrier with the
601 * exchange in cds_wfcq_enqueue.
603 futex_nto1_wake(&viewer_conn_queue
.futex
);
612 lttng_poll_clean(&events
);
614 if (live_control_sock
->fd
>= 0) {
615 ret
= live_control_sock
->ops
->close(live_control_sock
);
620 lttcomm_destroy_sock(live_control_sock
);
624 DBG("Live viewer listener thread exited with error");
626 health_unregister(health_relayd
);
627 DBG("Live viewer listener thread cleanup complete");
628 if (lttng_relay_stop_threads()) {
629 ERR("Error stopping threads");
635 * This thread manages the dispatching of the requests to worker threads
638 void *thread_dispatcher(void *data
)
642 struct cds_wfcq_node
*node
;
643 struct relay_connection
*conn
= NULL
;
645 DBG("[thread] Live viewer relay dispatcher started");
647 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
649 if (testpoint(relayd_thread_live_dispatcher
)) {
650 goto error_testpoint
;
653 health_code_update();
655 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
656 health_code_update();
658 /* Atomically prepare the queue futex */
659 futex_nto1_prepare(&viewer_conn_queue
.futex
);
662 health_code_update();
664 /* Dequeue commands */
665 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
666 &viewer_conn_queue
.tail
);
668 DBG("Woken up but nothing in the live-viewer "
669 "relay command queue");
670 /* Continue thread execution */
673 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
674 DBG("Dispatching viewer request waiting on sock %d",
678 * Inform worker thread of the new request. This
679 * call is blocking so we can be assured that
680 * the data will be read at some point in time
681 * or wait to the end of the world :)
683 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
685 PERROR("write conn pipe");
686 connection_put(conn
);
689 } while (node
!= NULL
);
691 /* Futex wait on queue. Blocking call on futex() */
693 futex_nto1_wait(&viewer_conn_queue
.futex
);
697 /* Normal exit, no error */
704 ERR("Health error occurred in %s", __func__
);
706 health_unregister(health_relayd
);
707 DBG("Live viewer dispatch thread dying");
708 if (lttng_relay_stop_threads()) {
709 ERR("Error stopping threads");
715 * Establish connection with the viewer and check the versions.
717 * Return 0 on success or else negative value.
720 int viewer_connect(struct relay_connection
*conn
)
723 struct lttng_viewer_connect reply
, msg
;
725 conn
->version_check_done
= 1;
727 health_code_update();
729 DBG("Viewer is establishing a connection to the relayd.");
731 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
736 health_code_update();
738 memset(&reply
, 0, sizeof(reply
));
739 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
740 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
742 /* Major versions must be the same */
743 if (reply
.major
!= be32toh(msg
.major
)) {
744 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
745 reply
.major
, be32toh(msg
.major
));
750 conn
->major
= reply
.major
;
751 /* We adapt to the lowest compatible version */
752 if (reply
.minor
<= be32toh(msg
.minor
)) {
753 conn
->minor
= reply
.minor
;
755 conn
->minor
= be32toh(msg
.minor
);
758 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
759 conn
->type
= RELAY_VIEWER_COMMAND
;
760 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
761 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
763 ERR("Unknown connection type : %u", be32toh(msg
.type
));
768 reply
.major
= htobe32(reply
.major
);
769 reply
.minor
= htobe32(reply
.minor
);
770 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
772 * Increment outside of htobe64 macro, because the argument can
773 * be used more than once within the macro, and thus the
774 * operation may be undefined.
776 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
777 last_relay_viewer_session_id
++;
778 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
779 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
782 health_code_update();
784 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
789 health_code_update();
791 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
799 * Send the viewer the list of current sessions.
800 * We need to create a copy of the hash table content because otherwise
801 * we cannot assume the number of entries stays the same between getting
802 * the number of HT elements and iteration over the HT.
804 * Return 0 on success or else a negative value.
807 int viewer_list_sessions(struct relay_connection
*conn
)
810 struct lttng_viewer_list_sessions session_list
;
811 struct lttng_ht_iter iter
;
812 struct relay_session
*session
;
813 struct lttng_viewer_session
*send_session_buf
= NULL
;
814 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
817 DBG("List sessions received");
819 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
820 if (!send_session_buf
) {
825 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
827 struct lttng_viewer_session
*send_session
;
829 health_code_update();
831 if (count
>= buf_count
) {
832 struct lttng_viewer_session
*newbuf
;
833 uint32_t new_buf_count
= buf_count
<< 1;
835 newbuf
= realloc(send_session_buf
,
836 new_buf_count
* sizeof(*send_session_buf
));
842 send_session_buf
= newbuf
;
843 buf_count
= new_buf_count
;
845 send_session
= &send_session_buf
[count
];
846 strncpy(send_session
->session_name
, session
->session_name
,
847 sizeof(send_session
->session_name
));
848 strncpy(send_session
->hostname
, session
->hostname
,
849 sizeof(send_session
->hostname
));
850 send_session
->id
= htobe64(session
->id
);
851 send_session
->live_timer
= htobe32(session
->live_timer
);
852 if (session
->viewer_attached
) {
853 send_session
->clients
= htobe32(1);
855 send_session
->clients
= htobe32(0);
857 send_session
->streams
= htobe32(session
->stream_count
);
862 session_list
.sessions_count
= htobe32(count
);
864 health_code_update();
866 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
871 health_code_update();
873 ret
= send_response(conn
->sock
, send_session_buf
,
874 count
* sizeof(*send_session_buf
));
878 health_code_update();
882 free(send_session_buf
);
887 * Send the viewer the list of current streams.
890 int viewer_get_new_streams(struct relay_connection
*conn
)
892 int ret
, send_streams
= 0;
893 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
894 struct lttng_viewer_new_streams_request request
;
895 struct lttng_viewer_new_streams_response response
;
896 struct relay_session
*session
;
902 DBG("Get new streams received");
904 health_code_update();
906 /* Receive the request from the connected client. */
907 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
911 session_id
= be64toh(request
.session_id
);
913 health_code_update();
915 memset(&response
, 0, sizeof(response
));
917 session
= session_get_by_id(session_id
);
919 DBG("Relay session %" PRIu64
" not found", session_id
);
920 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
924 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
926 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
931 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
933 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
934 &nb_created
, &closed
);
936 goto end_put_session
;
938 /* Only send back the newly created streams with the unsent ones. */
939 nb_streams
= nb_created
+ nb_unsent
;
940 response
.streams_count
= htobe32(nb_streams
);
943 * If the session is closed, HUP when there are no more streams
946 if (closed
&& nb_total
== 0) {
948 response
.streams_count
= 0;
949 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
954 health_code_update();
955 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
957 goto end_put_session
;
959 health_code_update();
962 * Unknown or empty session, just return gracefully, the viewer
963 * knows what is happening.
965 if (!send_streams
|| !nb_streams
) {
967 goto end_put_session
;
971 * Send stream and *DON'T* ignore the sent flag so every viewer
972 * streams that were not sent from that point will be sent to
975 ret
= send_viewer_streams(conn
->sock
, session
, 0);
977 goto end_put_session
;
982 session_put(session
);
989 * Send the viewer the list of current sessions.
992 int viewer_attach_session(struct relay_connection
*conn
)
994 int send_streams
= 0;
996 uint32_t nb_streams
= 0;
997 enum lttng_viewer_seek seek_type
;
998 struct lttng_viewer_attach_session_request request
;
999 struct lttng_viewer_attach_session_response response
;
1000 struct relay_session
*session
= NULL
;
1001 bool closed
= false;
1005 health_code_update();
1007 /* Receive the request from the connected client. */
1008 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1013 health_code_update();
1015 memset(&response
, 0, sizeof(response
));
1017 if (!conn
->viewer_session
) {
1018 DBG("Client trying to attach before creating a live viewer session");
1019 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1023 session
= session_get_by_id(be64toh(request
.session_id
));
1025 DBG("Relay session %" PRIu64
" not found",
1026 be64toh(request
.session_id
));
1027 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1030 DBG("Attach session ID %" PRIu64
" received",
1031 be64toh(request
.session_id
));
1033 if (session
->live_timer
== 0) {
1034 DBG("Not live session");
1035 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1040 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1042 DBG("Already a viewer attached");
1043 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1047 switch (be32toh(request
.seek
)) {
1048 case LTTNG_VIEWER_SEEK_BEGINNING
:
1049 case LTTNG_VIEWER_SEEK_LAST
:
1050 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1051 seek_type
= be32toh(request
.seek
);
1054 ERR("Wrong seek parameter");
1055 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1060 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1063 goto end_put_session
;
1065 response
.streams_count
= htobe32(nb_streams
);
1068 * If the session is closed when the viewer is attaching, it
1069 * means some of the streams may have been concurrently removed,
1070 * so we don't allow the viewer to attach, even if there are
1071 * streams available.
1075 response
.streams_count
= 0;
1076 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1081 health_code_update();
1082 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1084 goto end_put_session
;
1086 health_code_update();
1089 * Unknown or empty session, just return gracefully, the viewer
1090 * knows what is happening.
1092 if (!send_streams
|| !nb_streams
) {
1094 goto end_put_session
;
1097 /* Send stream and ignore the sent flag. */
1098 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1100 goto end_put_session
;
1105 session_put(session
);
1112 * Open the index file if needed for the given vstream.
1114 * If an index file is successfully opened, the vstream index_fd set with
1117 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1119 * Called with rstream lock held.
1121 static int try_open_index(struct relay_viewer_stream
*vstream
,
1122 struct relay_stream
*rstream
)
1126 if (vstream
->index_fd
) {
1131 * First time, we open the index file and at least one index is ready.
1133 if (rstream
->total_index_received
== 0) {
1137 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1138 vstream
->stream
->tracefile_count
,
1139 vstream
->current_tracefile_id
);
1141 vstream
->index_fd
= stream_fd_create(ret
);
1142 if (!vstream
->index_fd
) {
1158 * Check the status of the index for the given stream. This function
1159 * updates the index structure if needed and can put (close) the vstream
1160 * in the HUP situation.
1162 * Return 0 means that we can proceed with the index. A value of 1 means
1163 * that the index has been updated and is ready to be sent to the
1164 * client. A negative value indicates an error that can't be handled.
1166 * Called with rstream lock held.
1168 static int check_index_status(struct relay_viewer_stream
*vstream
,
1169 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1170 struct lttng_viewer_index
*index
)
1174 if (trace
->session
->connection_closed
1175 && rstream
->total_index_received
1176 == vstream
->last_sent_index
) {
1177 /* Last index sent and session connection is closed. */
1178 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1180 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1181 rstream
->total_index_received
1182 == vstream
->last_sent_index
) {
1184 * We've received a synchronization beacon and the last index
1185 * available has been sent, the index for now is inactive.
1187 * In this case, we have received a beacon which allows us to
1188 * inform the client of a time interval during which we can
1189 * guarantee that there are no events to read (and never will
1192 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1193 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1194 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1196 } else if (rstream
->total_index_received
<= vstream
->last_sent_index
) {
1198 * This actually checks the case where recv == last_sent.
1199 * In this case, we have not received a beacon. Therefore, we
1200 * can only ask the client to retry later.
1202 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1204 } else if (!viewer_stream_is_tracefile_seq_readable(vstream
,
1205 vstream
->current_tracefile_seq
)) {
1207 * The producer has overwritten our current file. We
1210 DBG("Viewer stream %" PRIu64
" rotation due to overwrite",
1211 vstream
->stream
->stream_handle
);
1212 ret
= viewer_stream_rotate(vstream
);
1215 } else if (ret
== 1) {
1216 /* EOF across entire stream. */
1217 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1220 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1221 vstream
->current_tracefile_seq
));
1222 /* ret == 0 means successful so we continue. */
1229 * Use EOF on current index file to find out when we
1232 read_ret
= lttng_read(vstream
->index_fd
->fd
, tmp
, 1);
1233 if (read_ret
== 1) {
1236 /* There is still data to read. Rewind position. */
1237 seek_ret
= lseek(vstream
->index_fd
->fd
, -1, SEEK_CUR
);
1243 } else if (read_ret
== 0) {
1244 /* EOF. We need to rotate. */
1245 DBG("Viewer stream %" PRIu64
" rotation due to EOF",
1246 vstream
->stream
->stream_handle
);
1247 ret
= viewer_stream_rotate(vstream
);
1250 } else if (ret
== 1) {
1251 /* EOF across entire stream. */
1252 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1255 assert(viewer_stream_is_tracefile_seq_readable(vstream
,
1256 vstream
->current_tracefile_seq
));
1257 /* ret == 0 means successful so we continue. */
1260 /* Error reading index. */
1268 viewer_stream_put(vstream
);
1274 * Send the next index for a stream.
1276 * Return 0 on success or else a negative value.
1279 int viewer_get_next_index(struct relay_connection
*conn
)
1283 struct lttng_viewer_get_next_index request_index
;
1284 struct lttng_viewer_index viewer_index
;
1285 struct ctf_packet_index packet_index
;
1286 struct relay_viewer_stream
*vstream
= NULL
;
1287 struct relay_stream
*rstream
= NULL
;
1288 struct ctf_trace
*ctf_trace
= NULL
;
1289 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1293 DBG("Viewer get next index");
1295 memset(&viewer_index
, 0, sizeof(viewer_index
));
1296 health_code_update();
1298 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1302 health_code_update();
1304 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1306 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1310 /* Use back. ref. Protected by refcounts. */
1311 rstream
= vstream
->stream
;
1312 ctf_trace
= rstream
->trace
;
1314 /* metadata_viewer_stream may be NULL. */
1315 metadata_viewer_stream
=
1316 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1318 pthread_mutex_lock(&rstream
->lock
);
1321 * The viewer should not ask for index on metadata stream.
1323 if (rstream
->is_metadata
) {
1324 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1328 /* Try to open an index if one is needed for that stream. */
1329 ret
= try_open_index(vstream
, rstream
);
1331 if (ret
== -ENOENT
) {
1333 * The index is created only when the first data
1334 * packet arrives, it might not be ready at the
1335 * beginning of the session
1337 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1339 /* Unhandled error. */
1340 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1345 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1348 } else if (ret
== 1) {
1350 * We have no index to send and check_index_status has populated
1351 * viewer_index's status.
1355 /* At this point, ret is 0 thus we will be able to read the index. */
1359 * vstream->stream_fd may be NULL if it has been closed by
1360 * tracefile rotation, or if we are at the beginning of the
1361 * stream. We open the data stream file here to protect against
1362 * overwrite caused by tracefile rotation (in association with
1363 * unlink performed before overwrite).
1365 if (!vstream
->stream_fd
) {
1366 char fullpath
[PATH_MAX
];
1368 if (vstream
->stream
->tracefile_count
> 0) {
1369 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1371 vstream
->channel_name
,
1372 vstream
->current_tracefile_id
);
1374 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1376 vstream
->channel_name
);
1381 ret
= open(fullpath
, O_RDONLY
);
1383 PERROR("Relay opening trace file");
1386 vstream
->stream_fd
= stream_fd_create(ret
);
1387 if (!vstream
->stream_fd
) {
1395 ret
= check_new_streams(conn
);
1397 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1399 } else if (ret
== 1) {
1400 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1403 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1404 sizeof(packet_index
));
1405 if (read_ret
< sizeof(packet_index
)) {
1406 ERR("Relay reading index file %d returned %zd",
1407 vstream
->index_fd
->fd
, read_ret
);
1408 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1411 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1412 vstream
->last_sent_index
++;
1416 * Indexes are stored in big endian, no need to switch before sending.
1418 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1419 rstream
->stream_handle
,
1420 be64toh(packet_index
.offset
));
1421 viewer_index
.offset
= packet_index
.offset
;
1422 viewer_index
.packet_size
= packet_index
.packet_size
;
1423 viewer_index
.content_size
= packet_index
.content_size
;
1424 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1425 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1426 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1427 viewer_index
.stream_id
= packet_index
.stream_id
;
1431 pthread_mutex_unlock(&rstream
->lock
);
1434 if (metadata_viewer_stream
) {
1435 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1436 DBG("get next index metadata check: recv %" PRIu64
1438 metadata_viewer_stream
->stream
->metadata_received
,
1439 metadata_viewer_stream
->metadata_sent
);
1440 if (!metadata_viewer_stream
->stream
->metadata_received
||
1441 metadata_viewer_stream
->stream
->metadata_received
>
1442 metadata_viewer_stream
->metadata_sent
) {
1443 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1445 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1448 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1449 health_code_update();
1451 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1455 health_code_update();
1457 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1458 vstream
->last_sent_index
,
1459 vstream
->stream
->stream_handle
);
1461 if (metadata_viewer_stream
) {
1462 viewer_stream_put(metadata_viewer_stream
);
1465 viewer_stream_put(vstream
);
1470 pthread_mutex_unlock(&rstream
->lock
);
1471 if (metadata_viewer_stream
) {
1472 viewer_stream_put(metadata_viewer_stream
);
1474 viewer_stream_put(vstream
);
1479 * Send the next index for a stream
1481 * Return 0 on success or else a negative value.
1484 int viewer_get_packet(struct relay_connection
*conn
)
1486 int ret
, send_data
= 0;
1490 struct lttng_viewer_get_packet get_packet_info
;
1491 struct lttng_viewer_trace_packet reply
;
1492 struct relay_viewer_stream
*vstream
= NULL
;
1494 DBG2("Relay get data packet");
1496 health_code_update();
1498 ret
= recv_request(conn
->sock
, &get_packet_info
,
1499 sizeof(get_packet_info
));
1503 health_code_update();
1505 /* From this point on, the error label can be reached. */
1506 memset(&reply
, 0, sizeof(reply
));
1508 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1510 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1511 goto send_reply_nolock
;
1514 pthread_mutex_lock(&vstream
->stream
->lock
);
1516 len
= be32toh(get_packet_info
.len
);
1517 data
= zmalloc(len
);
1519 PERROR("relay data zmalloc");
1523 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1526 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1527 be64toh(get_packet_info
.offset
));
1530 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1531 if (read_len
< len
) {
1532 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1533 vstream
->stream_fd
->fd
,
1534 be64toh(get_packet_info
.offset
));
1537 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1538 reply
.len
= htobe32(len
);
1543 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1547 pthread_mutex_unlock(&vstream
->stream
->lock
);
1550 reply
.flags
= htobe32(reply
.flags
);
1552 health_code_update();
1554 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1558 health_code_update();
1561 health_code_update();
1562 ret
= send_response(conn
->sock
, data
, len
);
1566 health_code_update();
1569 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1570 be64toh(get_packet_info
.stream_id
));
1576 viewer_stream_put(vstream
);
1582 * Send the session's metadata
1584 * Return 0 on success else a negative value.
1587 int viewer_get_metadata(struct relay_connection
*conn
)
1593 struct lttng_viewer_get_metadata request
;
1594 struct lttng_viewer_metadata_packet reply
;
1595 struct relay_viewer_stream
*vstream
= NULL
;
1599 DBG("Relay get metadata");
1601 health_code_update();
1603 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1607 health_code_update();
1609 memset(&reply
, 0, sizeof(reply
));
1611 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1614 * The metadata stream can be closed by a CLOSE command
1615 * just before we attach. It can also be closed by
1616 * per-pid tracing during tracing. Therefore, it is
1617 * possible that we cannot find this viewer stream.
1618 * Reply back to the client with an error if we cannot
1621 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1624 pthread_mutex_lock(&vstream
->stream
->lock
);
1625 if (!vstream
->stream
->is_metadata
) {
1626 ERR("Invalid metadata stream");
1630 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1632 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1634 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1638 /* first time, we open the metadata file */
1639 if (!vstream
->stream_fd
) {
1640 char fullpath
[PATH_MAX
];
1642 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1643 vstream
->channel_name
);
1647 ret
= open(fullpath
, O_RDONLY
);
1649 PERROR("Relay opening metadata file");
1652 vstream
->stream_fd
= stream_fd_create(ret
);
1653 if (!vstream
->stream_fd
) {
1661 reply
.len
= htobe64(len
);
1662 data
= zmalloc(len
);
1664 PERROR("viewer metadata zmalloc");
1668 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1669 if (read_len
< len
) {
1670 PERROR("Relay reading metadata file");
1673 vstream
->metadata_sent
+= read_len
;
1674 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1675 && vstream
->stream
->closed
) {
1676 /* Release ownership for the viewer metadata stream. */
1677 viewer_stream_put(vstream
);
1680 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1685 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1688 health_code_update();
1690 pthread_mutex_unlock(&vstream
->stream
->lock
);
1692 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1696 health_code_update();
1699 ret
= send_response(conn
->sock
, data
, len
);
1705 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1706 be64toh(request
.stream_id
));
1708 DBG("Metadata sent");
1714 viewer_stream_put(vstream
);
1720 * Create a viewer session.
1722 * Return 0 on success or else a negative value.
1725 int viewer_create_session(struct relay_connection
*conn
)
1728 struct lttng_viewer_create_session_response resp
;
1730 DBG("Viewer create session received");
1732 memset(&resp
, 0, sizeof(resp
));
1733 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1734 conn
->viewer_session
= viewer_session_create();
1735 if (!conn
->viewer_session
) {
1736 ERR("Allocation viewer session");
1737 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1742 health_code_update();
1743 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1747 health_code_update();
1756 * live_relay_unknown_command: send -1 if received unknown command
1759 void live_relay_unknown_command(struct relay_connection
*conn
)
1761 struct lttcomm_relayd_generic_reply reply
;
1763 memset(&reply
, 0, sizeof(reply
));
1764 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1765 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1769 * Process the commands received on the control socket
1772 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1773 struct relay_connection
*conn
)
1778 msg_value
= be32toh(recv_hdr
->cmd
);
1781 * Make sure we've done the version check before any command other then a
1782 * new client connection.
1784 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1785 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1790 switch (msg_value
) {
1791 case LTTNG_VIEWER_CONNECT
:
1792 ret
= viewer_connect(conn
);
1794 case LTTNG_VIEWER_LIST_SESSIONS
:
1795 ret
= viewer_list_sessions(conn
);
1797 case LTTNG_VIEWER_ATTACH_SESSION
:
1798 ret
= viewer_attach_session(conn
);
1800 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1801 ret
= viewer_get_next_index(conn
);
1803 case LTTNG_VIEWER_GET_PACKET
:
1804 ret
= viewer_get_packet(conn
);
1806 case LTTNG_VIEWER_GET_METADATA
:
1807 ret
= viewer_get_metadata(conn
);
1809 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1810 ret
= viewer_get_new_streams(conn
);
1812 case LTTNG_VIEWER_CREATE_SESSION
:
1813 ret
= viewer_create_session(conn
);
1816 ERR("Received unknown viewer command (%u)",
1817 be32toh(recv_hdr
->cmd
));
1818 live_relay_unknown_command(conn
);
1828 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1832 (void) lttng_poll_del(events
, pollfd
);
1834 ret
= close(pollfd
);
1836 ERR("Closing pollfd %d", pollfd
);
1841 * This thread does the actual work
1844 void *thread_worker(void *data
)
1848 struct lttng_poll_event events
;
1849 struct lttng_ht
*viewer_connections_ht
;
1850 struct lttng_ht_iter iter
;
1851 struct lttng_viewer_cmd recv_hdr
;
1852 struct relay_connection
*destroy_conn
;
1854 DBG("[thread] Live viewer relay worker started");
1856 rcu_register_thread();
1858 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1860 if (testpoint(relayd_thread_live_worker
)) {
1861 goto error_testpoint
;
1864 /* table of connections indexed on socket */
1865 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1866 if (!viewer_connections_ht
) {
1867 goto viewer_connections_ht_error
;
1870 ret
= create_thread_poll_set(&events
, 2);
1872 goto error_poll_create
;
1875 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1884 health_code_update();
1886 /* Infinite blocking call, waiting for transmission */
1887 DBG3("Relayd live viewer worker thread polling...");
1888 health_poll_entry();
1889 ret
= lttng_poll_wait(&events
, -1);
1893 * Restart interrupted system call.
1895 if (errno
== EINTR
) {
1904 * Process control. The control connection is prioritised so we don't
1905 * starve it with high throughput tracing data on the data
1908 for (i
= 0; i
< nb_fd
; i
++) {
1909 /* Fetch once the poll data */
1910 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1911 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1913 health_code_update();
1916 /* No activity for this FD (poll implementation). */
1920 /* Thread quit pipe has been closed. Killing thread. */
1921 ret
= check_thread_quit_pipe(pollfd
, revents
);
1927 /* Inspect the relay conn pipe for new connection. */
1928 if (pollfd
== live_conn_pipe
[0]) {
1929 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1930 ERR("Relay live pipe error");
1932 } else if (revents
& LPOLLIN
) {
1933 struct relay_connection
*conn
;
1935 ret
= lttng_read(live_conn_pipe
[0],
1936 &conn
, sizeof(conn
));
1940 lttng_poll_add(&events
, conn
->sock
->fd
,
1941 LPOLLIN
| LPOLLRDHUP
);
1942 connection_ht_add(viewer_connections_ht
, conn
);
1943 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1946 /* Connection activity. */
1947 struct relay_connection
*conn
;
1949 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1954 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1955 cleanup_connection_pollfd(&events
, pollfd
);
1956 /* Put "create" ownership reference. */
1957 connection_put(conn
);
1958 } else if (revents
& LPOLLIN
) {
1959 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1960 sizeof(recv_hdr
), 0);
1962 /* Connection closed. */
1963 cleanup_connection_pollfd(&events
, pollfd
);
1964 /* Put "create" ownership reference. */
1965 connection_put(conn
);
1966 DBG("Viewer control conn closed with %d", pollfd
);
1968 ret
= process_control(&recv_hdr
, conn
);
1970 /* Clear the session on error. */
1971 cleanup_connection_pollfd(&events
, pollfd
);
1972 /* Put "create" ownership reference. */
1973 connection_put(conn
);
1974 DBG("Viewer connection closed with %d", pollfd
);
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 if (lttng_poll_set_max_size()) {
2097 goto exit_init_data
;
2100 /* Setup the dispatcher thread */
2101 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2102 thread_dispatcher
, (void *) NULL
);
2105 PERROR("pthread_create viewer dispatcher");
2107 goto exit_dispatcher_thread
;
2110 /* Setup the worker thread */
2111 ret
= pthread_create(&live_worker_thread
, NULL
,
2112 thread_worker
, NULL
);
2115 PERROR("pthread_create viewer worker");
2117 goto exit_worker_thread
;
2120 /* Setup the listener thread */
2121 ret
= pthread_create(&live_listener_thread
, NULL
,
2122 thread_listener
, (void *) NULL
);
2125 PERROR("pthread_create viewer listener");
2127 goto exit_listener_thread
;
2131 * All OK, started all threads.
2136 * Join on the live_listener_thread should anything be added after
2137 * the live_listener thread's creation.
2140 exit_listener_thread
:
2142 ret
= pthread_join(live_worker_thread
, &status
);
2145 PERROR("pthread_join live worker");
2150 ret
= pthread_join(live_dispatcher_thread
, &status
);
2153 PERROR("pthread_join live dispatcher");
2156 exit_dispatcher_thread
:
2159 cleanup_relayd_live();