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 lock.
312 if (!stream
->published
) {
315 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
317 vstream
= viewer_stream_create(stream
, seek_t
);
320 ctf_trace_put(ctf_trace
);
326 /* Update number of created stream counter. */
330 * Ensure a self-reference is preserved even
331 * after we have put our local reference.
333 viewer_stream_get(vstream
);
335 if (!vstream
->sent_flag
&& nb_unsent
) {
336 /* Update number of unsent stream counter. */
340 /* Update number of total stream counter. */
342 if (stream
->is_metadata
) {
343 if (!stream
->closed
||
344 stream
->metadata_received
> vstream
->metadata_sent
) {
348 if (!stream
->closed
||
349 !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
355 /* Put local reference. */
356 viewer_stream_put(vstream
);
360 ctf_trace_put(ctf_trace
);
367 pthread_mutex_unlock(&session
->lock
);
371 int relayd_live_stop(void)
373 /* Stop dispatch thread */
374 CMM_STORE_SHARED(live_dispatch_thread_exit
, 1);
375 futex_nto1_wake(&viewer_conn_queue
.futex
);
380 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
383 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
387 if (events
== NULL
|| size
== 0) {
392 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
398 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
410 * Check if the thread quit pipe was triggered.
412 * Return 1 if it was triggered else 0;
415 int check_thread_quit_pipe(int fd
, uint32_t events
)
417 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
425 * Create and init socket from uri.
428 struct lttcomm_sock
*init_socket(struct lttng_uri
*uri
)
431 struct lttcomm_sock
*sock
= NULL
;
433 sock
= lttcomm_alloc_sock_from_uri(uri
);
435 ERR("Allocating socket");
439 ret
= lttcomm_create_sock(sock
);
443 DBG("Listening on sock %d for live", sock
->fd
);
445 ret
= sock
->ops
->bind(sock
);
450 ret
= sock
->ops
->listen(sock
, -1);
460 lttcomm_destroy_sock(sock
);
466 * This thread manages the listening for new connections on the network
469 void *thread_listener(void *data
)
471 int i
, ret
, pollfd
, err
= -1;
472 uint32_t revents
, nb_fd
;
473 struct lttng_poll_event events
;
474 struct lttcomm_sock
*live_control_sock
;
476 DBG("[thread] Relay live listener started");
478 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_LISTENER
);
480 health_code_update();
482 live_control_sock
= init_socket(live_uri
);
483 if (!live_control_sock
) {
484 goto error_sock_control
;
487 /* Pass 2 as size here for the thread quit pipe and control sockets. */
488 ret
= create_thread_poll_set(&events
, 2);
490 goto error_create_poll
;
493 /* Add the control socket */
494 ret
= lttng_poll_add(&events
, live_control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
499 lttng_relay_notify_ready();
501 if (testpoint(relayd_thread_live_listener
)) {
502 goto error_testpoint
;
506 health_code_update();
508 DBG("Listener accepting live viewers connections");
512 ret
= lttng_poll_wait(&events
, -1);
516 * Restart interrupted system call.
518 if (errno
== EINTR
) {
525 DBG("Relay new viewer connection received");
526 for (i
= 0; i
< nb_fd
; i
++) {
527 health_code_update();
529 /* Fetch once the poll data */
530 revents
= LTTNG_POLL_GETEV(&events
, i
);
531 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
534 /* No activity for this FD (poll implementation). */
538 /* Thread quit pipe has been closed. Killing thread. */
539 ret
= check_thread_quit_pipe(pollfd
, revents
);
545 if (revents
& LPOLLIN
) {
547 * A new connection is requested, therefore a
548 * viewer connection is allocated in this
549 * thread, enqueued to a global queue and
550 * dequeued (and freed) in the worker thread.
553 struct relay_connection
*new_conn
;
554 struct lttcomm_sock
*newsock
;
556 newsock
= live_control_sock
->ops
->accept(live_control_sock
);
558 PERROR("accepting control sock");
561 DBG("Relay viewer connection accepted socket %d", newsock
->fd
);
563 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
566 PERROR("setsockopt inet");
567 lttcomm_destroy_sock(newsock
);
570 new_conn
= connection_create(newsock
, RELAY_CONNECTION_UNKNOWN
);
572 lttcomm_destroy_sock(newsock
);
575 /* Ownership assumed by the connection. */
578 /* Enqueue request for the dispatcher thread. */
579 cds_wfcq_enqueue(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
,
583 * Wake the dispatch queue futex.
584 * Implicit memory barrier with the
585 * exchange in cds_wfcq_enqueue.
587 futex_nto1_wake(&viewer_conn_queue
.futex
);
588 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
589 ERR("socket poll error");
592 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
602 lttng_poll_clean(&events
);
604 if (live_control_sock
->fd
>= 0) {
605 ret
= live_control_sock
->ops
->close(live_control_sock
);
610 lttcomm_destroy_sock(live_control_sock
);
614 DBG("Live viewer listener thread exited with error");
616 health_unregister(health_relayd
);
617 DBG("Live viewer listener thread cleanup complete");
618 if (lttng_relay_stop_threads()) {
619 ERR("Error stopping threads");
625 * This thread manages the dispatching of the requests to worker threads
628 void *thread_dispatcher(void *data
)
632 struct cds_wfcq_node
*node
;
633 struct relay_connection
*conn
= NULL
;
635 DBG("[thread] Live viewer relay dispatcher started");
637 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_DISPATCHER
);
639 if (testpoint(relayd_thread_live_dispatcher
)) {
640 goto error_testpoint
;
643 health_code_update();
645 while (!CMM_LOAD_SHARED(live_dispatch_thread_exit
)) {
646 health_code_update();
648 /* Atomically prepare the queue futex */
649 futex_nto1_prepare(&viewer_conn_queue
.futex
);
652 health_code_update();
654 /* Dequeue commands */
655 node
= cds_wfcq_dequeue_blocking(&viewer_conn_queue
.head
,
656 &viewer_conn_queue
.tail
);
658 DBG("Woken up but nothing in the live-viewer "
659 "relay command queue");
660 /* Continue thread execution */
663 conn
= caa_container_of(node
, struct relay_connection
, qnode
);
664 DBG("Dispatching viewer request waiting on sock %d",
668 * Inform worker thread of the new request. This
669 * call is blocking so we can be assured that
670 * the data will be read at some point in time
671 * or wait to the end of the world :)
673 ret
= lttng_write(live_conn_pipe
[1], &conn
, sizeof(conn
));
675 PERROR("write conn pipe");
676 connection_put(conn
);
679 } while (node
!= NULL
);
681 /* Futex wait on queue. Blocking call on futex() */
683 futex_nto1_wait(&viewer_conn_queue
.futex
);
687 /* Normal exit, no error */
694 ERR("Health error occurred in %s", __func__
);
696 health_unregister(health_relayd
);
697 DBG("Live viewer dispatch thread dying");
698 if (lttng_relay_stop_threads()) {
699 ERR("Error stopping threads");
705 * Establish connection with the viewer and check the versions.
707 * Return 0 on success or else negative value.
710 int viewer_connect(struct relay_connection
*conn
)
713 struct lttng_viewer_connect reply
, msg
;
715 conn
->version_check_done
= 1;
717 health_code_update();
719 DBG("Viewer is establishing a connection to the relayd.");
721 ret
= recv_request(conn
->sock
, &msg
, sizeof(msg
));
726 health_code_update();
728 memset(&reply
, 0, sizeof(reply
));
729 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
730 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
732 /* Major versions must be the same */
733 if (reply
.major
!= be32toh(msg
.major
)) {
734 DBG("Incompatible major versions ([relayd] %u vs [client] %u)",
735 reply
.major
, be32toh(msg
.major
));
740 conn
->major
= reply
.major
;
741 /* We adapt to the lowest compatible version */
742 if (reply
.minor
<= be32toh(msg
.minor
)) {
743 conn
->minor
= reply
.minor
;
745 conn
->minor
= be32toh(msg
.minor
);
748 if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_COMMAND
) {
749 conn
->type
= RELAY_VIEWER_COMMAND
;
750 } else if (be32toh(msg
.type
) == LTTNG_VIEWER_CLIENT_NOTIFICATION
) {
751 conn
->type
= RELAY_VIEWER_NOTIFICATION
;
753 ERR("Unknown connection type : %u", be32toh(msg
.type
));
758 reply
.major
= htobe32(reply
.major
);
759 reply
.minor
= htobe32(reply
.minor
);
760 if (conn
->type
== RELAY_VIEWER_COMMAND
) {
762 * Increment outside of htobe64 macro, because the argument can
763 * be used more than once within the macro, and thus the
764 * operation may be undefined.
766 pthread_mutex_lock(&last_relay_viewer_session_id_lock
);
767 last_relay_viewer_session_id
++;
768 pthread_mutex_unlock(&last_relay_viewer_session_id_lock
);
769 reply
.viewer_session_id
= htobe64(last_relay_viewer_session_id
);
772 health_code_update();
774 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
779 health_code_update();
781 DBG("Version check done using protocol %u.%u", conn
->major
, conn
->minor
);
789 * Send the viewer the list of current sessions.
790 * We need to create a copy of the hash table content because otherwise
791 * we cannot assume the number of entries stays the same between getting
792 * the number of HT elements and iteration over the HT.
794 * Return 0 on success or else a negative value.
797 int viewer_list_sessions(struct relay_connection
*conn
)
800 struct lttng_viewer_list_sessions session_list
;
801 struct lttng_ht_iter iter
;
802 struct relay_session
*session
;
803 struct lttng_viewer_session
*send_session_buf
= NULL
;
804 uint32_t buf_count
= SESSION_BUF_DEFAULT_COUNT
;
807 DBG("List sessions received");
809 send_session_buf
= zmalloc(SESSION_BUF_DEFAULT_COUNT
* sizeof(*send_session_buf
));
810 if (!send_session_buf
) {
815 cds_lfht_for_each_entry(sessions_ht
->ht
, &iter
.iter
, session
,
817 struct lttng_viewer_session
*send_session
;
819 health_code_update();
821 if (count
>= buf_count
) {
822 struct lttng_viewer_session
*newbuf
;
823 uint32_t new_buf_count
= buf_count
<< 1;
825 newbuf
= realloc(send_session_buf
,
826 new_buf_count
* sizeof(*send_session_buf
));
832 send_session_buf
= newbuf
;
833 buf_count
= new_buf_count
;
835 send_session
= &send_session_buf
[count
];
836 strncpy(send_session
->session_name
, session
->session_name
,
837 sizeof(send_session
->session_name
));
838 strncpy(send_session
->hostname
, session
->hostname
,
839 sizeof(send_session
->hostname
));
840 send_session
->id
= htobe64(session
->id
);
841 send_session
->live_timer
= htobe32(session
->live_timer
);
842 if (session
->viewer_attached
) {
843 send_session
->clients
= htobe32(1);
845 send_session
->clients
= htobe32(0);
847 send_session
->streams
= htobe32(session
->stream_count
);
852 session_list
.sessions_count
= htobe32(count
);
854 health_code_update();
856 ret
= send_response(conn
->sock
, &session_list
, sizeof(session_list
));
861 health_code_update();
863 ret
= send_response(conn
->sock
, send_session_buf
,
864 count
* sizeof(*send_session_buf
));
868 health_code_update();
872 free(send_session_buf
);
877 * Send the viewer the list of current streams.
880 int viewer_get_new_streams(struct relay_connection
*conn
)
882 int ret
, send_streams
= 0;
883 uint32_t nb_created
= 0, nb_unsent
= 0, nb_streams
= 0, nb_total
= 0;
884 struct lttng_viewer_new_streams_request request
;
885 struct lttng_viewer_new_streams_response response
;
886 struct relay_session
*session
;
892 DBG("Get new streams received");
894 health_code_update();
896 /* Receive the request from the connected client. */
897 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
901 session_id
= be64toh(request
.session_id
);
903 health_code_update();
905 memset(&response
, 0, sizeof(response
));
907 session
= session_get_by_id(session_id
);
909 DBG("Relay session %" PRIu64
" not found", session_id
);
910 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
914 if (!viewer_session_is_attached(conn
->viewer_session
, session
)) {
916 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_ERR
);
921 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_OK
);
923 ret
= make_viewer_streams(session
, LTTNG_VIEWER_SEEK_LAST
, &nb_total
, &nb_unsent
,
924 &nb_created
, &closed
);
926 goto end_put_session
;
928 /* Only send back the newly created streams with the unsent ones. */
929 nb_streams
= nb_created
+ nb_unsent
;
930 response
.streams_count
= htobe32(nb_streams
);
933 * If the session is closed, HUP when there are no more streams
936 if (closed
&& nb_total
== 0) {
938 response
.streams_count
= 0;
939 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
944 health_code_update();
945 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
947 goto end_put_session
;
949 health_code_update();
952 * Unknown or empty session, just return gracefully, the viewer
953 * knows what is happening.
955 if (!send_streams
|| !nb_streams
) {
957 goto end_put_session
;
961 * Send stream and *DON'T* ignore the sent flag so every viewer
962 * streams that were not sent from that point will be sent to
965 ret
= send_viewer_streams(conn
->sock
, session
, 0);
967 goto end_put_session
;
972 session_put(session
);
979 * Send the viewer the list of current sessions.
982 int viewer_attach_session(struct relay_connection
*conn
)
984 int send_streams
= 0;
986 uint32_t nb_streams
= 0;
987 enum lttng_viewer_seek seek_type
;
988 struct lttng_viewer_attach_session_request request
;
989 struct lttng_viewer_attach_session_response response
;
990 struct relay_session
*session
= NULL
;
995 health_code_update();
997 /* Receive the request from the connected client. */
998 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1003 health_code_update();
1005 memset(&response
, 0, sizeof(response
));
1007 if (!conn
->viewer_session
) {
1008 DBG("Client trying to attach before creating a live viewer session");
1009 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NO_SESSION
);
1013 session
= session_get_by_id(be64toh(request
.session_id
));
1015 DBG("Relay session %" PRIu64
" not found",
1016 be64toh(request
.session_id
));
1017 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_UNK
);
1020 DBG("Attach session ID %" PRIu64
" received",
1021 be64toh(request
.session_id
));
1023 if (session
->live_timer
== 0) {
1024 DBG("Not live session");
1025 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_NOT_LIVE
);
1030 ret
= viewer_session_attach(conn
->viewer_session
, session
);
1032 DBG("Already a viewer attached");
1033 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_ALREADY
);
1037 switch (be32toh(request
.seek
)) {
1038 case LTTNG_VIEWER_SEEK_BEGINNING
:
1039 case LTTNG_VIEWER_SEEK_LAST
:
1040 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_OK
);
1041 seek_type
= be32toh(request
.seek
);
1044 ERR("Wrong seek parameter");
1045 response
.status
= htobe32(LTTNG_VIEWER_ATTACH_SEEK_ERR
);
1050 ret
= make_viewer_streams(session
, seek_type
, &nb_streams
, NULL
,
1053 goto end_put_session
;
1055 response
.streams_count
= htobe32(nb_streams
);
1058 * If the session is closed when the viewer is attaching, it
1059 * means some of the streams may have been concurrently removed,
1060 * so we don't allow the viewer to attach, even if there are
1061 * streams available.
1065 response
.streams_count
= 0;
1066 response
.status
= htobe32(LTTNG_VIEWER_NEW_STREAMS_HUP
);
1071 health_code_update();
1072 ret
= send_response(conn
->sock
, &response
, sizeof(response
));
1074 goto end_put_session
;
1076 health_code_update();
1079 * Unknown or empty session, just return gracefully, the viewer
1080 * knows what is happening.
1082 if (!send_streams
|| !nb_streams
) {
1084 goto end_put_session
;
1087 /* Send stream and ignore the sent flag. */
1088 ret
= send_viewer_streams(conn
->sock
, session
, 1);
1090 goto end_put_session
;
1095 session_put(session
);
1102 * Open the index file if needed for the given vstream.
1104 * If an index file is successfully opened, the vstream index_fd set with
1107 * Return 0 on success, a negative value on error (-ENOENT if not ready yet).
1109 * Called with rstream lock held.
1111 static int try_open_index(struct relay_viewer_stream
*vstream
,
1112 struct relay_stream
*rstream
)
1116 if (vstream
->index_fd
) {
1121 * First time, we open the index file and at least one index is ready.
1123 if (rstream
->index_received_seqcount
== 0) {
1127 ret
= index_open(vstream
->path_name
, vstream
->channel_name
,
1128 vstream
->stream
->tracefile_count
,
1129 vstream
->current_tracefile_id
);
1131 vstream
->index_fd
= stream_fd_create(ret
);
1132 if (!vstream
->index_fd
) {
1148 * Check the status of the index for the given stream. This function
1149 * updates the index structure if needed and can put (close) the vstream
1150 * in the HUP situation.
1152 * Return 0 means that we can proceed with the index. A value of 1 means
1153 * that the index has been updated and is ready to be sent to the
1154 * client. A negative value indicates an error that can't be handled.
1156 * Called with rstream lock held.
1158 static int check_index_status(struct relay_viewer_stream
*vstream
,
1159 struct relay_stream
*rstream
, struct ctf_trace
*trace
,
1160 struct lttng_viewer_index
*index
)
1164 if (trace
->session
->connection_closed
1165 && rstream
->index_received_seqcount
1166 == vstream
->index_sent_seqcount
) {
1167 /* Last index sent and session connection is closed. */
1168 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1170 } else if (rstream
->beacon_ts_end
!= -1ULL &&
1171 rstream
->index_received_seqcount
1172 == vstream
->index_sent_seqcount
) {
1174 * We've received a synchronization beacon and the last index
1175 * available has been sent, the index for now is inactive.
1177 * In this case, we have received a beacon which allows us to
1178 * inform the client of a time interval during which we can
1179 * guarantee that there are no events to read (and never will
1182 index
->status
= htobe32(LTTNG_VIEWER_INDEX_INACTIVE
);
1183 index
->timestamp_end
= htobe64(rstream
->beacon_ts_end
);
1184 index
->stream_id
= htobe64(rstream
->ctf_stream_id
);
1186 } else if (rstream
->index_received_seqcount
1187 == vstream
->index_sent_seqcount
) {
1189 * This checks whether received == sent seqcount. In
1190 * this case, we have not received a beacon. Therefore,
1191 * we can only ask the client to retry later.
1193 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1195 } else if (!tracefile_array_seq_in_file(rstream
->tfa
,
1196 vstream
->current_tracefile_id
,
1197 vstream
->index_sent_seqcount
)) {
1199 * The next index we want to send cannot be read either
1200 * because we need to perform a rotation, or due to
1201 * the producer having overwritten its trace file.
1203 DBG("Viewer stream %" PRIu64
" rotation",
1204 vstream
->stream
->stream_handle
);
1205 ret
= viewer_stream_rotate(vstream
);
1208 } else if (ret
== 1) {
1209 /* EOF across entire stream. */
1210 index
->status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1214 * If we have been pushed due to overwrite, it
1215 * necessarily means there is data that can be read in
1216 * the stream. If we rotated because we reached the end
1217 * of a tracefile, it means the following tracefile
1218 * needs to contain at least one index, else we would
1219 * have already returned LTTNG_VIEWER_INDEX_RETRY to the
1220 * viewer. The updated index_sent_seqcount needs to
1221 * point to a readable index entry now.
1223 * In the case where we "rotate" on a single file, we
1224 * can end up in a case where the requested index is
1225 * still unavailable.
1227 if (rstream
->tracefile_count
== 1 &&
1228 !tracefile_array_seq_in_file(
1230 vstream
->current_tracefile_id
,
1231 vstream
->index_sent_seqcount
)) {
1232 index
->status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1235 assert(tracefile_array_seq_in_file(rstream
->tfa
,
1236 vstream
->current_tracefile_id
,
1237 vstream
->index_sent_seqcount
));
1239 /* ret == 0 means successful so we continue. */
1245 viewer_stream_put(vstream
);
1251 * Send the next index for a stream.
1253 * Return 0 on success or else a negative value.
1256 int viewer_get_next_index(struct relay_connection
*conn
)
1260 struct lttng_viewer_get_next_index request_index
;
1261 struct lttng_viewer_index viewer_index
;
1262 struct ctf_packet_index packet_index
;
1263 struct relay_viewer_stream
*vstream
= NULL
;
1264 struct relay_stream
*rstream
= NULL
;
1265 struct ctf_trace
*ctf_trace
= NULL
;
1266 struct relay_viewer_stream
*metadata_viewer_stream
= NULL
;
1270 DBG("Viewer get next index");
1272 memset(&viewer_index
, 0, sizeof(viewer_index
));
1273 health_code_update();
1275 ret
= recv_request(conn
->sock
, &request_index
, sizeof(request_index
));
1279 health_code_update();
1281 vstream
= viewer_stream_get_by_id(be64toh(request_index
.stream_id
));
1283 DBG("Client requested index of unknown stream id %" PRIu64
,
1284 be64toh(request_index
.stream_id
));
1285 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1289 /* Use back. ref. Protected by refcounts. */
1290 rstream
= vstream
->stream
;
1291 ctf_trace
= rstream
->trace
;
1293 /* metadata_viewer_stream may be NULL. */
1294 metadata_viewer_stream
=
1295 ctf_trace_get_viewer_metadata_stream(ctf_trace
);
1297 pthread_mutex_lock(&rstream
->lock
);
1300 * The viewer should not ask for index on metadata stream.
1302 if (rstream
->is_metadata
) {
1303 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_HUP
);
1307 /* Try to open an index if one is needed for that stream. */
1308 ret
= try_open_index(vstream
, rstream
);
1310 if (ret
== -ENOENT
) {
1312 * The index is created only when the first data
1313 * packet arrives, it might not be ready at the
1314 * beginning of the session
1316 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_RETRY
);
1318 /* Unhandled error. */
1319 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1324 ret
= check_index_status(vstream
, rstream
, ctf_trace
, &viewer_index
);
1327 } else if (ret
== 1) {
1329 * We have no index to send and check_index_status has populated
1330 * viewer_index's status.
1334 /* At this point, ret is 0 thus we will be able to read the index. */
1338 * vstream->stream_fd may be NULL if it has been closed by
1339 * tracefile rotation, or if we are at the beginning of the
1340 * stream. We open the data stream file here to protect against
1341 * overwrite caused by tracefile rotation (in association with
1342 * unlink performed before overwrite).
1344 if (!vstream
->stream_fd
) {
1345 char fullpath
[PATH_MAX
];
1347 if (vstream
->stream
->tracefile_count
> 0) {
1348 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s_%" PRIu64
,
1350 vstream
->channel_name
,
1351 vstream
->current_tracefile_id
);
1353 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s",
1355 vstream
->channel_name
);
1360 ret
= open(fullpath
, O_RDONLY
);
1362 PERROR("Relay opening trace file");
1365 vstream
->stream_fd
= stream_fd_create(ret
);
1366 if (!vstream
->stream_fd
) {
1374 ret
= check_new_streams(conn
);
1376 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1378 } else if (ret
== 1) {
1379 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_STREAM
;
1382 read_ret
= lttng_read(vstream
->index_fd
->fd
, &packet_index
,
1383 sizeof(packet_index
));
1384 if (read_ret
< sizeof(packet_index
)) {
1385 ERR("Relay reading index file %d returned %zd",
1386 vstream
->index_fd
->fd
, read_ret
);
1387 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_ERR
);
1390 viewer_index
.status
= htobe32(LTTNG_VIEWER_INDEX_OK
);
1391 vstream
->index_sent_seqcount
++;
1395 * Indexes are stored in big endian, no need to switch before sending.
1397 DBG("Sending viewer index for stream %" PRIu64
" offset %" PRIu64
,
1398 rstream
->stream_handle
,
1399 be64toh(packet_index
.offset
));
1400 viewer_index
.offset
= packet_index
.offset
;
1401 viewer_index
.packet_size
= packet_index
.packet_size
;
1402 viewer_index
.content_size
= packet_index
.content_size
;
1403 viewer_index
.timestamp_begin
= packet_index
.timestamp_begin
;
1404 viewer_index
.timestamp_end
= packet_index
.timestamp_end
;
1405 viewer_index
.events_discarded
= packet_index
.events_discarded
;
1406 viewer_index
.stream_id
= packet_index
.stream_id
;
1410 pthread_mutex_unlock(&rstream
->lock
);
1413 if (metadata_viewer_stream
) {
1414 pthread_mutex_lock(&metadata_viewer_stream
->stream
->lock
);
1415 DBG("get next index metadata check: recv %" PRIu64
1417 metadata_viewer_stream
->stream
->metadata_received
,
1418 metadata_viewer_stream
->metadata_sent
);
1419 if (!metadata_viewer_stream
->stream
->metadata_received
||
1420 metadata_viewer_stream
->stream
->metadata_received
>
1421 metadata_viewer_stream
->metadata_sent
) {
1422 viewer_index
.flags
|= LTTNG_VIEWER_FLAG_NEW_METADATA
;
1424 pthread_mutex_unlock(&metadata_viewer_stream
->stream
->lock
);
1427 viewer_index
.flags
= htobe32(viewer_index
.flags
);
1428 health_code_update();
1430 ret
= send_response(conn
->sock
, &viewer_index
, sizeof(viewer_index
));
1434 health_code_update();
1437 DBG("Index %" PRIu64
" for stream %" PRIu64
" sent",
1438 vstream
->index_sent_seqcount
,
1439 vstream
->stream
->stream_handle
);
1442 if (metadata_viewer_stream
) {
1443 viewer_stream_put(metadata_viewer_stream
);
1446 viewer_stream_put(vstream
);
1451 pthread_mutex_unlock(&rstream
->lock
);
1452 if (metadata_viewer_stream
) {
1453 viewer_stream_put(metadata_viewer_stream
);
1455 viewer_stream_put(vstream
);
1460 * Send the next index for a stream
1462 * Return 0 on success or else a negative value.
1465 int viewer_get_packet(struct relay_connection
*conn
)
1467 int ret
, send_data
= 0;
1471 struct lttng_viewer_get_packet get_packet_info
;
1472 struct lttng_viewer_trace_packet reply
;
1473 struct relay_viewer_stream
*vstream
= NULL
;
1475 DBG2("Relay get data packet");
1477 health_code_update();
1479 ret
= recv_request(conn
->sock
, &get_packet_info
,
1480 sizeof(get_packet_info
));
1484 health_code_update();
1486 /* From this point on, the error label can be reached. */
1487 memset(&reply
, 0, sizeof(reply
));
1489 vstream
= viewer_stream_get_by_id(be64toh(get_packet_info
.stream_id
));
1491 DBG("Client requested packet of unknown stream id %" PRIu64
,
1492 be64toh(get_packet_info
.stream_id
));
1493 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1494 goto send_reply_nolock
;
1497 pthread_mutex_lock(&vstream
->stream
->lock
);
1499 len
= be32toh(get_packet_info
.len
);
1500 data
= zmalloc(len
);
1502 PERROR("relay data zmalloc");
1506 ret
= lseek(vstream
->stream_fd
->fd
, be64toh(get_packet_info
.offset
),
1509 PERROR("lseek fd %d to offset %" PRIu64
, vstream
->stream_fd
->fd
,
1510 be64toh(get_packet_info
.offset
));
1513 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1514 if (read_len
< len
) {
1515 PERROR("Relay reading trace file, fd: %d, offset: %" PRIu64
,
1516 vstream
->stream_fd
->fd
,
1517 be64toh(get_packet_info
.offset
));
1520 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_OK
);
1521 reply
.len
= htobe32(len
);
1526 reply
.status
= htobe32(LTTNG_VIEWER_GET_PACKET_ERR
);
1530 pthread_mutex_unlock(&vstream
->stream
->lock
);
1533 reply
.flags
= htobe32(reply
.flags
);
1535 health_code_update();
1537 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1541 health_code_update();
1544 health_code_update();
1545 ret
= send_response(conn
->sock
, data
, len
);
1549 health_code_update();
1552 DBG("Sent %u bytes for stream %" PRIu64
, len
,
1553 be64toh(get_packet_info
.stream_id
));
1559 viewer_stream_put(vstream
);
1565 * Send the session's metadata
1567 * Return 0 on success else a negative value.
1570 int viewer_get_metadata(struct relay_connection
*conn
)
1576 struct lttng_viewer_get_metadata request
;
1577 struct lttng_viewer_metadata_packet reply
;
1578 struct relay_viewer_stream
*vstream
= NULL
;
1582 DBG("Relay get metadata");
1584 health_code_update();
1586 ret
= recv_request(conn
->sock
, &request
, sizeof(request
));
1590 health_code_update();
1592 memset(&reply
, 0, sizeof(reply
));
1594 vstream
= viewer_stream_get_by_id(be64toh(request
.stream_id
));
1597 * The metadata stream can be closed by a CLOSE command
1598 * just before we attach. It can also be closed by
1599 * per-pid tracing during tracing. Therefore, it is
1600 * possible that we cannot find this viewer stream.
1601 * Reply back to the client with an error if we cannot
1604 DBG("Client requested metadata of unknown stream id %" PRIu64
,
1605 be64toh(request
.stream_id
));
1606 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1609 pthread_mutex_lock(&vstream
->stream
->lock
);
1610 if (!vstream
->stream
->is_metadata
) {
1611 ERR("Invalid metadata stream");
1615 assert(vstream
->metadata_sent
<= vstream
->stream
->metadata_received
);
1617 len
= vstream
->stream
->metadata_received
- vstream
->metadata_sent
;
1619 reply
.status
= htobe32(LTTNG_VIEWER_NO_NEW_METADATA
);
1623 /* first time, we open the metadata file */
1624 if (!vstream
->stream_fd
) {
1625 char fullpath
[PATH_MAX
];
1627 ret
= snprintf(fullpath
, PATH_MAX
, "%s/%s", vstream
->path_name
,
1628 vstream
->channel_name
);
1632 ret
= open(fullpath
, O_RDONLY
);
1634 PERROR("Relay opening metadata file");
1637 vstream
->stream_fd
= stream_fd_create(ret
);
1638 if (!vstream
->stream_fd
) {
1646 reply
.len
= htobe64(len
);
1647 data
= zmalloc(len
);
1649 PERROR("viewer metadata zmalloc");
1653 read_len
= lttng_read(vstream
->stream_fd
->fd
, data
, len
);
1654 if (read_len
< len
) {
1655 PERROR("Relay reading metadata file");
1658 vstream
->metadata_sent
+= read_len
;
1659 if (vstream
->metadata_sent
== vstream
->stream
->metadata_received
1660 && vstream
->stream
->closed
) {
1661 /* Release ownership for the viewer metadata stream. */
1662 viewer_stream_put(vstream
);
1665 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_OK
);
1670 reply
.status
= htobe32(LTTNG_VIEWER_METADATA_ERR
);
1673 health_code_update();
1675 pthread_mutex_unlock(&vstream
->stream
->lock
);
1677 ret
= send_response(conn
->sock
, &reply
, sizeof(reply
));
1681 health_code_update();
1684 ret
= send_response(conn
->sock
, data
, len
);
1690 DBG("Sent %" PRIu64
" bytes of metadata for stream %" PRIu64
, len
,
1691 be64toh(request
.stream_id
));
1693 DBG("Metadata sent");
1699 viewer_stream_put(vstream
);
1705 * Create a viewer session.
1707 * Return 0 on success or else a negative value.
1710 int viewer_create_session(struct relay_connection
*conn
)
1713 struct lttng_viewer_create_session_response resp
;
1715 DBG("Viewer create session received");
1717 memset(&resp
, 0, sizeof(resp
));
1718 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_OK
);
1719 conn
->viewer_session
= viewer_session_create();
1720 if (!conn
->viewer_session
) {
1721 ERR("Allocation viewer session");
1722 resp
.status
= htobe32(LTTNG_VIEWER_CREATE_SESSION_ERR
);
1727 health_code_update();
1728 ret
= send_response(conn
->sock
, &resp
, sizeof(resp
));
1732 health_code_update();
1741 * live_relay_unknown_command: send -1 if received unknown command
1744 void live_relay_unknown_command(struct relay_connection
*conn
)
1746 struct lttcomm_relayd_generic_reply reply
;
1748 memset(&reply
, 0, sizeof(reply
));
1749 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1750 (void) send_response(conn
->sock
, &reply
, sizeof(reply
));
1754 * Process the commands received on the control socket
1757 int process_control(struct lttng_viewer_cmd
*recv_hdr
,
1758 struct relay_connection
*conn
)
1763 msg_value
= be32toh(recv_hdr
->cmd
);
1766 * Make sure we've done the version check before any command other then a
1767 * new client connection.
1769 if (msg_value
!= LTTNG_VIEWER_CONNECT
&& !conn
->version_check_done
) {
1770 ERR("Viewer conn value %" PRIu32
" before version check", msg_value
);
1775 switch (msg_value
) {
1776 case LTTNG_VIEWER_CONNECT
:
1777 ret
= viewer_connect(conn
);
1779 case LTTNG_VIEWER_LIST_SESSIONS
:
1780 ret
= viewer_list_sessions(conn
);
1782 case LTTNG_VIEWER_ATTACH_SESSION
:
1783 ret
= viewer_attach_session(conn
);
1785 case LTTNG_VIEWER_GET_NEXT_INDEX
:
1786 ret
= viewer_get_next_index(conn
);
1788 case LTTNG_VIEWER_GET_PACKET
:
1789 ret
= viewer_get_packet(conn
);
1791 case LTTNG_VIEWER_GET_METADATA
:
1792 ret
= viewer_get_metadata(conn
);
1794 case LTTNG_VIEWER_GET_NEW_STREAMS
:
1795 ret
= viewer_get_new_streams(conn
);
1797 case LTTNG_VIEWER_CREATE_SESSION
:
1798 ret
= viewer_create_session(conn
);
1801 ERR("Received unknown viewer command (%u)",
1802 be32toh(recv_hdr
->cmd
));
1803 live_relay_unknown_command(conn
);
1813 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
1817 (void) lttng_poll_del(events
, pollfd
);
1819 ret
= close(pollfd
);
1821 ERR("Closing pollfd %d", pollfd
);
1826 * This thread does the actual work
1829 void *thread_worker(void *data
)
1833 struct lttng_poll_event events
;
1834 struct lttng_ht
*viewer_connections_ht
;
1835 struct lttng_ht_iter iter
;
1836 struct lttng_viewer_cmd recv_hdr
;
1837 struct relay_connection
*destroy_conn
;
1839 DBG("[thread] Live viewer relay worker started");
1841 rcu_register_thread();
1843 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LIVE_WORKER
);
1845 if (testpoint(relayd_thread_live_worker
)) {
1846 goto error_testpoint
;
1849 /* table of connections indexed on socket */
1850 viewer_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1851 if (!viewer_connections_ht
) {
1852 goto viewer_connections_ht_error
;
1855 ret
= create_thread_poll_set(&events
, 2);
1857 goto error_poll_create
;
1860 ret
= lttng_poll_add(&events
, live_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1869 health_code_update();
1871 /* Infinite blocking call, waiting for transmission */
1872 DBG3("Relayd live viewer worker thread polling...");
1873 health_poll_entry();
1874 ret
= lttng_poll_wait(&events
, -1);
1878 * Restart interrupted system call.
1880 if (errno
== EINTR
) {
1889 * Process control. The control connection is prioritised so we don't
1890 * starve it with high throughput tracing data on the data
1893 for (i
= 0; i
< nb_fd
; i
++) {
1894 /* Fetch once the poll data */
1895 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1896 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1898 health_code_update();
1901 /* No activity for this FD (poll implementation). */
1905 /* Thread quit pipe has been closed. Killing thread. */
1906 ret
= check_thread_quit_pipe(pollfd
, revents
);
1912 /* Inspect the relay conn pipe for new connection. */
1913 if (pollfd
== live_conn_pipe
[0]) {
1914 if (revents
& LPOLLIN
) {
1915 struct relay_connection
*conn
;
1917 ret
= lttng_read(live_conn_pipe
[0],
1918 &conn
, sizeof(conn
));
1922 lttng_poll_add(&events
, conn
->sock
->fd
,
1923 LPOLLIN
| LPOLLRDHUP
);
1924 connection_ht_add(viewer_connections_ht
, conn
);
1925 DBG("Connection socket %d added to poll", conn
->sock
->fd
);
1926 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1927 ERR("Relay live pipe error");
1930 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1934 /* Connection activity. */
1935 struct relay_connection
*conn
;
1937 conn
= connection_get_by_sock(viewer_connections_ht
, pollfd
);
1942 if (revents
& LPOLLIN
) {
1943 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
1944 sizeof(recv_hdr
), 0);
1946 /* Connection closed. */
1947 cleanup_connection_pollfd(&events
, pollfd
);
1948 /* Put "create" ownership reference. */
1949 connection_put(conn
);
1950 DBG("Viewer control conn closed with %d", pollfd
);
1952 ret
= process_control(&recv_hdr
, conn
);
1954 /* Clear the session on error. */
1955 cleanup_connection_pollfd(&events
, pollfd
);
1956 /* Put "create" ownership reference. */
1957 connection_put(conn
);
1958 DBG("Viewer connection closed with %d", pollfd
);
1961 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1962 cleanup_connection_pollfd(&events
, pollfd
);
1963 /* Put "create" ownership reference. */
1964 connection_put(conn
);
1966 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1967 connection_put(conn
);
1970 /* Put local "get_by_sock" reference. */
1971 connection_put(conn
);
1978 lttng_poll_clean(&events
);
1980 /* Cleanup reamaining connection object. */
1982 cds_lfht_for_each_entry(viewer_connections_ht
->ht
, &iter
.iter
,
1985 health_code_update();
1986 connection_put(destroy_conn
);
1990 lttng_ht_destroy(viewer_connections_ht
);
1991 viewer_connections_ht_error
:
1992 /* Close relay conn pipes */
1993 utils_close_pipe(live_conn_pipe
);
1995 DBG("Viewer worker thread exited with error");
1997 DBG("Viewer worker thread cleanup complete");
2001 ERR("Health error occurred in %s", __func__
);
2003 health_unregister(health_relayd
);
2004 if (lttng_relay_stop_threads()) {
2005 ERR("Error stopping threads");
2007 rcu_unregister_thread();
2012 * Create the relay command pipe to wake thread_manage_apps.
2013 * Closed in cleanup().
2015 static int create_conn_pipe(void)
2017 return utils_create_pipe_cloexec(live_conn_pipe
);
2020 int relayd_live_join(void)
2022 int ret
, retval
= 0;
2025 ret
= pthread_join(live_listener_thread
, &status
);
2028 PERROR("pthread_join live listener");
2032 ret
= pthread_join(live_worker_thread
, &status
);
2035 PERROR("pthread_join live worker");
2039 ret
= pthread_join(live_dispatcher_thread
, &status
);
2042 PERROR("pthread_join live dispatcher");
2046 cleanup_relayd_live();
2054 int relayd_live_create(struct lttng_uri
*uri
)
2056 int ret
= 0, retval
= 0;
2062 goto exit_init_data
;
2066 /* Check if daemon is UID = 0 */
2067 is_root
= !getuid();
2070 if (live_uri
->port
< 1024) {
2071 ERR("Need to be root to use ports < 1024");
2073 goto exit_init_data
;
2077 /* Setup the thread apps communication pipe. */
2078 if (create_conn_pipe()) {
2080 goto exit_init_data
;
2083 /* Init relay command queue. */
2084 cds_wfcq_init(&viewer_conn_queue
.head
, &viewer_conn_queue
.tail
);
2086 /* Set up max poll set size */
2087 if (lttng_poll_set_max_size()) {
2089 goto exit_init_data
;
2092 /* Setup the dispatcher thread */
2093 ret
= pthread_create(&live_dispatcher_thread
, NULL
,
2094 thread_dispatcher
, (void *) NULL
);
2097 PERROR("pthread_create viewer dispatcher");
2099 goto exit_dispatcher_thread
;
2102 /* Setup the worker thread */
2103 ret
= pthread_create(&live_worker_thread
, NULL
,
2104 thread_worker
, NULL
);
2107 PERROR("pthread_create viewer worker");
2109 goto exit_worker_thread
;
2112 /* Setup the listener thread */
2113 ret
= pthread_create(&live_listener_thread
, NULL
,
2114 thread_listener
, (void *) NULL
);
2117 PERROR("pthread_create viewer listener");
2119 goto exit_listener_thread
;
2123 * All OK, started all threads.
2128 * Join on the live_listener_thread should anything be added after
2129 * the live_listener thread's creation.
2132 exit_listener_thread
:
2134 ret
= pthread_join(live_worker_thread
, &status
);
2137 PERROR("pthread_join live worker");
2142 ret
= pthread_join(live_dispatcher_thread
, &status
);
2145 PERROR("pthread_join live dispatcher");
2148 exit_dispatcher_thread
:
2151 cleanup_relayd_live();