2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
36 #include <urcu/futex.h>
37 #include <urcu/uatomic.h>
42 #include <lttng/lttng.h>
43 #include <common/common.h>
44 #include <common/compat/poll.h>
45 #include <common/compat/socket.h>
46 #include <common/defaults.h>
47 #include <common/futex.h>
48 #include <common/sessiond-comm/sessiond-comm.h>
49 #include <common/sessiond-comm/inet.h>
50 #include <common/sessiond-comm/relayd.h>
51 #include <common/uri.h>
52 #include <common/utils.h>
55 #include "ctf-trace.h"
58 #include "lttng-relayd.h"
60 #include "health-relayd.h"
62 /* command line options */
63 char *opt_output_path
;
64 static int opt_daemon
;
65 static struct lttng_uri
*control_uri
;
66 static struct lttng_uri
*data_uri
;
67 static struct lttng_uri
*live_uri
;
71 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
74 * Quit pipe for all threads. This permits a single cancellation point
75 * for all threads when receiving an event on the pipe.
77 static int thread_quit_pipe
[2] = { -1, -1 };
80 * This pipe is used to inform the worker thread that a command is queued and
81 * ready to be processed.
83 static int relay_cmd_pipe
[2] = { -1, -1 };
85 /* Shared between threads */
86 static int dispatch_thread_exit
;
88 static pthread_t listener_thread
;
89 static pthread_t dispatcher_thread
;
90 static pthread_t worker_thread
;
91 static pthread_t health_thread
;
93 static uint64_t last_relay_stream_id
;
94 static uint64_t last_relay_session_id
;
97 * Relay command queue.
99 * The relay_thread_listener and relay_thread_dispatcher communicate with this
102 static struct relay_cmd_queue relay_cmd_queue
;
104 /* buffer allocated at startup, used to store the trace data */
105 static char *data_buffer
;
106 static unsigned int data_buffer_size
;
108 /* We need those values for the file/dir creation. */
109 static uid_t relayd_uid
;
110 static gid_t relayd_gid
;
112 /* Global relay stream hash table. */
113 struct lttng_ht
*relay_streams_ht
;
115 /* Global relay viewer stream hash table. */
116 struct lttng_ht
*viewer_streams_ht
;
118 /* Global hash table that stores relay index object. */
119 struct lttng_ht
*indexes_ht
;
121 /* Relayd health monitoring */
122 struct health_app
*health_relayd
;
125 * usage function on stderr
130 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
131 fprintf(stderr
, " -h, --help Display this usage.\n");
132 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
133 fprintf(stderr
, " -C, --control-port URL Control port listening.\n");
134 fprintf(stderr
, " -D, --data-port URL Data port listening.\n");
135 fprintf(stderr
, " -L, --live-port URL Live view port listening.\n");
136 fprintf(stderr
, " -o, --output PATH Output path for traces. Must use an absolute path.\n");
137 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
138 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
142 int parse_args(int argc
, char **argv
)
146 char *default_address
;
148 static struct option long_options
[] = {
149 { "control-port", 1, 0, 'C', },
150 { "data-port", 1, 0, 'D', },
151 { "daemonize", 0, 0, 'd', },
152 { "group", 1, 0, 'g', },
153 { "help", 0, 0, 'h', },
154 { "output", 1, 0, 'o', },
155 { "verbose", 0, 0, 'v', },
160 int option_index
= 0;
161 c
= getopt_long(argc
, argv
, "dhv" "C:D:L:o:g:",
162 long_options
, &option_index
);
169 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
171 fprintf(stderr
, " with arg %s\n", optarg
);
175 ret
= uri_parse(optarg
, &control_uri
);
177 ERR("Invalid control URI specified");
180 if (control_uri
->port
== 0) {
181 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
185 ret
= uri_parse(optarg
, &data_uri
);
187 ERR("Invalid data URI specified");
190 if (data_uri
->port
== 0) {
191 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
195 ret
= uri_parse(optarg
, &live_uri
);
197 ERR("Invalid live URI specified");
200 if (live_uri
->port
== 0) {
201 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
208 tracing_group_name
= optarg
;
214 ret
= asprintf(&opt_output_path
, "%s", optarg
);
216 PERROR("asprintf opt_output_path");
221 /* Verbose level can increase using multiple -v */
222 lttng_opt_verbose
+= 1;
225 /* Unknown option or other error.
226 * Error is printed by getopt, just return */
232 /* assign default values */
233 if (control_uri
== NULL
) {
234 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
235 DEFAULT_NETWORK_CONTROL_PORT
);
237 PERROR("asprintf default data address");
241 ret
= uri_parse(default_address
, &control_uri
);
242 free(default_address
);
244 ERR("Invalid control URI specified");
248 if (data_uri
== NULL
) {
249 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
250 DEFAULT_NETWORK_DATA_PORT
);
252 PERROR("asprintf default data address");
256 ret
= uri_parse(default_address
, &data_uri
);
257 free(default_address
);
259 ERR("Invalid data URI specified");
263 if (live_uri
== NULL
) {
264 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
265 DEFAULT_NETWORK_VIEWER_PORT
);
267 PERROR("asprintf default viewer control address");
271 ret
= uri_parse(default_address
, &live_uri
);
272 free(default_address
);
274 ERR("Invalid viewer control URI specified");
291 /* free the dynamically allocated opt_output_path */
292 free(opt_output_path
);
294 /* Close thread quit pipes */
295 utils_close_pipe(thread_quit_pipe
);
297 uri_free(control_uri
);
299 /* Live URI is freed in the live thread. */
303 * Write to writable pipe used to notify a thread.
306 int notify_thread_pipe(int wpipe
)
310 ret
= lttng_write(wpipe
, "!", 1);
312 PERROR("write poll pipe");
318 static void notify_health_quit_pipe(int *pipe
)
322 ret
= lttng_write(pipe
[1], "4", 1);
324 PERROR("write relay health quit");
329 * Stop all threads by closing the thread quit pipe.
332 void stop_threads(void)
336 /* Stopping all threads */
337 DBG("Terminating all threads");
338 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
340 ERR("write error on thread quit pipe");
343 notify_health_quit_pipe(health_quit_pipe
);
345 /* Dispatch thread */
346 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
347 futex_nto1_wake(&relay_cmd_queue
.futex
);
351 * Signal handler for the daemon
353 * Simply stop all worker threads, leaving main() return gracefully after
354 * joining all threads and calling cleanup().
357 void sighandler(int sig
)
361 DBG("SIGPIPE caught");
364 DBG("SIGINT caught");
368 DBG("SIGTERM caught");
377 * Setup signal handler for :
378 * SIGINT, SIGTERM, SIGPIPE
381 int set_signal_handler(void)
387 if ((ret
= sigemptyset(&sigset
)) < 0) {
388 PERROR("sigemptyset");
392 sa
.sa_handler
= sighandler
;
395 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
400 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
405 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
410 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
416 * Init thread quit pipe.
418 * Return -1 on error or 0 if all pipes are created.
421 int init_thread_quit_pipe(void)
425 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
431 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
434 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
438 if (events
== NULL
|| size
== 0) {
443 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
449 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
461 * Check if the thread quit pipe was triggered.
463 * Return 1 if it was triggered else 0;
466 int check_thread_quit_pipe(int fd
, uint32_t events
)
468 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
476 * Create and init socket from uri.
479 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
482 struct lttcomm_sock
*sock
= NULL
;
484 sock
= lttcomm_alloc_sock_from_uri(uri
);
486 ERR("Allocating socket");
490 ret
= lttcomm_create_sock(sock
);
494 DBG("Listening on sock %d", sock
->fd
);
496 ret
= sock
->ops
->bind(sock
);
501 ret
= sock
->ops
->listen(sock
, -1);
511 lttcomm_destroy_sock(sock
);
517 * Return nonzero if stream needs to be closed.
520 int close_stream_check(struct relay_stream
*stream
)
523 if (stream
->close_flag
&& stream
->prev_seq
== stream
->last_net_seq_num
) {
525 * We are about to close the stream so set the data pending flag to 1
526 * which will make the end data pending command skip the stream which
527 * is now closed and ready. Note that after proceeding to a file close,
528 * the written file is ready for reading.
530 stream
->data_pending_check_done
= 1;
537 * This thread manages the listening for new connections on the network
540 void *relay_thread_listener(void *data
)
542 int i
, ret
, pollfd
, err
= -1;
544 uint32_t revents
, nb_fd
;
545 struct lttng_poll_event events
;
546 struct lttcomm_sock
*control_sock
, *data_sock
;
548 DBG("[thread] Relay listener started");
550 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
552 health_code_update();
554 control_sock
= relay_init_sock(control_uri
);
556 goto error_sock_control
;
559 data_sock
= relay_init_sock(data_uri
);
561 goto error_sock_relay
;
565 * Pass 3 as size here for the thread quit pipe, control and data socket.
567 ret
= create_thread_poll_set(&events
, 3);
569 goto error_create_poll
;
572 /* Add the control socket */
573 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
578 /* Add the data socket */
579 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
585 health_code_update();
587 DBG("Listener accepting connections");
591 ret
= lttng_poll_wait(&events
, -1);
595 * Restart interrupted system call.
597 if (errno
== EINTR
) {
605 DBG("Relay new connection received");
606 for (i
= 0; i
< nb_fd
; i
++) {
607 health_code_update();
609 /* Fetch once the poll data */
610 revents
= LTTNG_POLL_GETEV(&events
, i
);
611 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
613 /* Thread quit pipe has been closed. Killing thread. */
614 ret
= check_thread_quit_pipe(pollfd
, revents
);
620 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
621 ERR("socket poll error");
623 } else if (revents
& LPOLLIN
) {
625 * Get allocated in this thread,
626 * enqueued to a global queue, dequeued
627 * and freed in the worker thread.
629 struct relay_command
*relay_cmd
;
630 struct lttcomm_sock
*newsock
;
632 relay_cmd
= zmalloc(sizeof(struct relay_command
));
633 if (relay_cmd
== NULL
) {
634 PERROR("relay command zmalloc");
638 if (pollfd
== data_sock
->fd
) {
639 newsock
= data_sock
->ops
->accept(data_sock
);
641 PERROR("accepting data sock");
645 relay_cmd
->type
= RELAY_DATA
;
646 DBG("Relay data connection accepted, socket %d", newsock
->fd
);
648 assert(pollfd
== control_sock
->fd
);
649 newsock
= control_sock
->ops
->accept(control_sock
);
651 PERROR("accepting control sock");
655 relay_cmd
->type
= RELAY_CONTROL
;
656 DBG("Relay control connection accepted, socket %d", newsock
->fd
);
658 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
,
661 PERROR("setsockopt inet");
662 lttcomm_destroy_sock(newsock
);
666 relay_cmd
->sock
= newsock
;
668 * Lock free enqueue the request.
670 cds_wfq_enqueue(&relay_cmd_queue
.queue
, &relay_cmd
->node
);
673 * Wake the dispatch queue futex. Implicit memory
674 * barrier with the exchange in cds_wfq_enqueue.
676 futex_nto1_wake(&relay_cmd_queue
.futex
);
684 lttng_poll_clean(&events
);
686 if (data_sock
->fd
>= 0) {
687 ret
= data_sock
->ops
->close(data_sock
);
692 lttcomm_destroy_sock(data_sock
);
694 if (control_sock
->fd
>= 0) {
695 ret
= control_sock
->ops
->close(control_sock
);
700 lttcomm_destroy_sock(control_sock
);
704 ERR("Health error occurred in %s", __func__
);
706 health_unregister(health_relayd
);
707 DBG("Relay listener thread cleanup complete");
713 * This thread manages the dispatching of the requests to worker threads
716 void *relay_thread_dispatcher(void *data
)
720 struct cds_wfq_node
*node
;
721 struct relay_command
*relay_cmd
= NULL
;
723 DBG("[thread] Relay dispatcher started");
725 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
727 health_code_update();
729 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
730 health_code_update();
732 /* Atomically prepare the queue futex */
733 futex_nto1_prepare(&relay_cmd_queue
.futex
);
736 health_code_update();
738 /* Dequeue commands */
739 node
= cds_wfq_dequeue_blocking(&relay_cmd_queue
.queue
);
741 DBG("Woken up but nothing in the relay command queue");
742 /* Continue thread execution */
746 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
747 DBG("Dispatching request waiting on sock %d", relay_cmd
->sock
->fd
);
750 * Inform worker thread of the new request. This
751 * call is blocking so we can be assured that the data will be read
752 * at some point in time or wait to the end of the world :)
754 ret
= lttng_write(relay_cmd_pipe
[1], relay_cmd
,
755 sizeof(struct relay_command
));
757 if (ret
< sizeof(struct relay_command
)) {
758 PERROR("write cmd pipe");
761 } while (node
!= NULL
);
763 /* Futex wait on queue. Blocking call on futex() */
765 futex_nto1_wait(&relay_cmd_queue
.futex
);
769 /* Normal exit, no error */
775 ERR("Health error occurred in %s", __func__
);
777 health_unregister(health_relayd
);
778 DBG("Dispatch thread dying");
784 * Get stream from stream id.
785 * Need to be called with RCU read-side lock held.
787 struct relay_stream
*relay_stream_find_by_id(uint64_t stream_id
)
789 struct lttng_ht_node_ulong
*node
;
790 struct lttng_ht_iter iter
;
791 struct relay_stream
*ret
;
793 lttng_ht_lookup(relay_streams_ht
,
794 (void *)((unsigned long) stream_id
),
796 node
= lttng_ht_iter_get_node_ulong(&iter
);
798 DBG("Relay stream %" PRIu64
" not found", stream_id
);
803 ret
= caa_container_of(node
, struct relay_stream
, stream_n
);
810 void deferred_free_stream(struct rcu_head
*head
)
812 struct relay_stream
*stream
=
813 caa_container_of(head
, struct relay_stream
, rcu_node
);
815 free(stream
->path_name
);
816 free(stream
->channel_name
);
821 void deferred_free_session(struct rcu_head
*head
)
823 struct relay_session
*session
=
824 caa_container_of(head
, struct relay_session
, rcu_node
);
829 * Close a given stream. The stream is freed using a call RCU.
831 * RCU read side lock MUST be acquired. If NO close_stream_check() was called
832 * BEFORE the stream lock MUST be acquired.
834 static void destroy_stream(struct relay_stream
*stream
)
837 struct relay_viewer_stream
*vstream
;
838 struct lttng_ht_iter iter
;
842 delret
= close(stream
->fd
);
844 PERROR("close stream");
847 if (stream
->index_fd
>= 0) {
848 delret
= close(stream
->index_fd
);
850 PERROR("close stream index_fd");
854 vstream
= live_find_viewer_stream_by_id(stream
->stream_handle
);
857 * Set the last good value into the viewer stream. This is done
858 * right before the stream gets deleted from the hash table. The
859 * lookup failure on the live thread side of a stream indicates
860 * that the viewer stream index received value should be used.
862 pthread_mutex_lock(&stream
->viewer_stream_rotation_lock
);
863 vstream
->total_index_received
= stream
->total_index_received
;
864 vstream
->tracefile_count_last
= stream
->tracefile_count_current
;
865 vstream
->close_write_flag
= 1;
866 pthread_mutex_unlock(&stream
->viewer_stream_rotation_lock
);
869 /* Cleanup index of that stream. */
870 relay_index_destroy_by_stream_id(stream
->stream_handle
);
872 iter
.iter
.node
= &stream
->stream_n
.node
;
873 delret
= lttng_ht_del(relay_streams_ht
, &iter
);
875 iter
.iter
.node
= &stream
->ctf_trace_node
.node
;
876 delret
= lttng_ht_del(stream
->ctf_traces_ht
, &iter
);
879 if (stream
->ctf_trace
) {
880 ctf_trace_try_destroy(stream
->ctf_trace
);
883 call_rcu(&stream
->rcu_node
, deferred_free_stream
);
884 DBG("Closed tracefile %d from close stream", stream
->fd
);
888 * relay_delete_session: Free all memory associated with a session and
892 void relay_delete_session(struct relay_command
*cmd
,
893 struct lttng_ht
*sessions_ht
)
895 struct lttng_ht_iter iter
;
896 struct lttng_ht_node_ulong
*node
;
897 struct relay_stream
*stream
;
904 DBG("Relay deleting session %" PRIu64
, cmd
->session
->id
);
907 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, node
, node
) {
908 node
= lttng_ht_iter_get_node_ulong(&iter
);
912 stream
= caa_container_of(node
, struct relay_stream
, stream_n
);
913 if (stream
->session
== cmd
->session
) {
914 destroy_stream(stream
);
915 cmd
->session
->stream_count
--;
916 assert(cmd
->session
->stream_count
>= 0);
920 /* Make this session not visible anymore. */
921 iter
.iter
.node
= &cmd
->session
->session_n
.node
;
922 ret
= lttng_ht_del(sessions_ht
, &iter
);
924 call_rcu(&cmd
->session
->rcu_node
, deferred_free_session
);
929 * Copy index data from the control port to a given index object.
931 static void copy_index_control_data(struct relay_index
*index
,
932 struct lttcomm_relayd_index
*data
)
938 * The index on disk is encoded in big endian, so we don't need to convert
939 * the data received on the network. The data_offset value is NEVER
940 * modified here and is updated by the data thread.
942 index
->index_data
.packet_size
= data
->packet_size
;
943 index
->index_data
.content_size
= data
->content_size
;
944 index
->index_data
.timestamp_begin
= data
->timestamp_begin
;
945 index
->index_data
.timestamp_end
= data
->timestamp_end
;
946 index
->index_data
.events_discarded
= data
->events_discarded
;
947 index
->index_data
.stream_id
= data
->stream_id
;
951 * Handle the RELAYD_CREATE_SESSION command.
953 * On success, send back the session id or else return a negative value.
956 int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
957 struct relay_command
*cmd
,
958 struct lttng_ht
*sessions_ht
)
960 int ret
= 0, send_ret
;
961 struct relay_session
*session
;
962 struct lttcomm_relayd_status_session reply
;
967 memset(&reply
, 0, sizeof(reply
));
969 session
= zmalloc(sizeof(struct relay_session
));
970 if (session
== NULL
) {
971 PERROR("relay session zmalloc");
976 session
->id
= ++last_relay_session_id
;
977 session
->sock
= cmd
->sock
;
978 session
->minor
= cmd
->minor
;
979 session
->major
= cmd
->major
;
980 cmd
->session
= session
;
982 reply
.session_id
= htobe64(session
->id
);
984 switch (cmd
->minor
) {
985 case 4: /* LTTng sessiond 2.4 */
987 ret
= cmd_create_session_2_4(cmd
, session
);
991 lttng_ht_node_init_ulong(&session
->session_n
,
992 (unsigned long) session
->id
);
993 lttng_ht_add_unique_ulong(sessions_ht
,
994 &session
->session_n
);
996 DBG("Created session %" PRIu64
, session
->id
);
1000 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1002 reply
.ret_code
= htobe32(LTTNG_OK
);
1005 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1007 ERR("Relayd sending session id");
1015 * When we have received all the streams and the metadata for a channel,
1016 * we make them visible to the viewer threads.
1019 void set_viewer_ready_flag(struct relay_command
*cmd
)
1021 struct relay_stream_recv_handle
*node
, *tmp_node
;
1023 cds_list_for_each_entry_safe(node
, tmp_node
, &cmd
->recv_head
, node
) {
1024 struct relay_stream
*stream
;
1027 stream
= relay_stream_find_by_id(node
->id
);
1030 * Stream is most probably being cleaned up by the data thread thus
1031 * simply continue to the next one.
1037 * If any of the streams in the list doesn't have a ctf_trace assigned,
1038 * it means that we never received the metadata stream, so we have to
1039 * wait until it arrives to make the streams available to the viewer.
1041 if (!stream
->ctf_trace
) {
1045 stream
->viewer_ready
= 1;
1048 /* Clean stream handle node. */
1049 cds_list_del(&node
->node
);
1058 * Add a recv handle node to the connection recv list with the given stream
1059 * handle. A new node is allocated thus must be freed when the node is deleted
1062 static void queue_stream_handle(uint64_t handle
, struct relay_command
*cmd
)
1064 struct relay_stream_recv_handle
*node
;
1068 node
= zmalloc(sizeof(*node
));
1070 PERROR("zmalloc queue stream handle");
1075 cds_list_add(&node
->node
, &cmd
->recv_head
);
1079 * relay_add_stream: allocate a new stream for a session
1082 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1083 struct relay_command
*cmd
, struct lttng_ht
*sessions_ht
)
1085 struct relay_session
*session
= cmd
->session
;
1086 struct relay_stream
*stream
= NULL
;
1087 struct lttcomm_relayd_status_stream reply
;
1090 if (!session
|| cmd
->version_check_done
== 0) {
1091 ERR("Trying to add a stream before version check");
1093 goto end_no_session
;
1096 stream
= zmalloc(sizeof(struct relay_stream
));
1097 if (stream
== NULL
) {
1098 PERROR("relay stream zmalloc");
1100 goto end_no_session
;
1103 switch (cmd
->minor
) {
1104 case 1: /* LTTng sessiond 2.1 */
1105 ret
= cmd_recv_stream_2_1(cmd
, stream
);
1107 case 2: /* LTTng sessiond 2.2 */
1109 ret
= cmd_recv_stream_2_2(cmd
, stream
);
1113 goto err_free_stream
;
1117 stream
->stream_handle
= ++last_relay_stream_id
;
1118 stream
->prev_seq
= -1ULL;
1119 stream
->session
= session
;
1120 stream
->index_fd
= -1;
1121 stream
->read_index_fd
= -1;
1122 stream
->ctf_trace
= NULL
;
1123 pthread_mutex_init(&stream
->lock
, NULL
);
1125 ret
= utils_mkdir_recursive(stream
->path_name
, S_IRWXU
| S_IRWXG
);
1127 ERR("relay creating output directory");
1132 * No need to use run_as API here because whatever we receives, the relayd
1133 * uses its own credentials for the stream files.
1135 ret
= utils_create_stream_file(stream
->path_name
, stream
->channel_name
,
1136 stream
->tracefile_size
, 0, relayd_uid
, relayd_gid
, NULL
);
1138 ERR("Create output file");
1142 if (stream
->tracefile_size
) {
1143 DBG("Tracefile %s/%s_0 created", stream
->path_name
, stream
->channel_name
);
1145 DBG("Tracefile %s/%s created", stream
->path_name
, stream
->channel_name
);
1148 if (!strncmp(stream
->channel_name
, DEFAULT_METADATA_NAME
, NAME_MAX
)) {
1149 stream
->metadata_flag
= 1;
1151 * When we receive a new metadata stream, we create a new
1152 * ctf_trace and we assign this ctf_trace to all streams with
1155 * If later on we receive a new stream for the same ctf_trace,
1156 * we copy the information from the first hit in the HT to the
1159 stream
->ctf_trace
= ctf_trace_create();
1160 if (!stream
->ctf_trace
) {
1164 stream
->ctf_trace
->refcount
++;
1165 stream
->ctf_trace
->metadata_stream
= stream
;
1167 ctf_trace_assign(cmd
->ctf_traces_ht
, stream
);
1168 stream
->ctf_traces_ht
= cmd
->ctf_traces_ht
;
1171 * Add the stream handle in the recv list of the connection. Once the end
1172 * stream message is received, this list is emptied and streams are set
1173 * with the viewer ready flag.
1175 queue_stream_handle(stream
->stream_handle
, cmd
);
1177 lttng_ht_node_init_ulong(&stream
->stream_n
,
1178 (unsigned long) stream
->stream_handle
);
1179 lttng_ht_add_unique_ulong(relay_streams_ht
,
1182 lttng_ht_node_init_str(&stream
->ctf_trace_node
, stream
->path_name
);
1183 lttng_ht_add_str(cmd
->ctf_traces_ht
, &stream
->ctf_trace_node
);
1184 session
->stream_count
++;
1186 DBG("Relay new stream added %s with ID %" PRIu64
, stream
->channel_name
,
1187 stream
->stream_handle
);
1190 reply
.handle
= htobe64(stream
->stream_handle
);
1191 /* send the session id to the client or a negative return code on error */
1193 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1194 /* stream was not properly added to the ht, so free it */
1197 reply
.ret_code
= htobe32(LTTNG_OK
);
1200 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1201 sizeof(struct lttcomm_relayd_status_stream
), 0);
1203 ERR("Relay sending stream id");
1212 free(stream
->path_name
);
1213 free(stream
->channel_name
);
1219 * relay_close_stream: close a specific stream
1222 int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1223 struct relay_command
*cmd
)
1226 struct relay_session
*session
= cmd
->session
;
1227 struct lttcomm_relayd_close_stream stream_info
;
1228 struct lttcomm_relayd_generic_reply reply
;
1229 struct relay_stream
*stream
;
1231 DBG("Close stream received");
1233 if (!session
|| cmd
->version_check_done
== 0) {
1234 ERR("Trying to close a stream before version check");
1236 goto end_no_session
;
1239 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
1240 sizeof(struct lttcomm_relayd_close_stream
), 0);
1241 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1243 /* Orderly shutdown. Not necessary to print an error. */
1244 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1246 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1249 goto end_no_session
;
1253 stream
= relay_stream_find_by_id(be64toh(stream_info
.stream_id
));
1259 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1260 stream
->close_flag
= 1;
1261 session
->stream_count
--;
1262 assert(session
->stream_count
>= 0);
1264 if (close_stream_check(stream
)) {
1265 destroy_stream(stream
);
1272 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1274 reply
.ret_code
= htobe32(LTTNG_OK
);
1276 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1277 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1279 ERR("Relay sending stream id");
1288 * relay_unknown_command: send -1 if received unknown command
1291 void relay_unknown_command(struct relay_command
*cmd
)
1293 struct lttcomm_relayd_generic_reply reply
;
1296 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1297 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1298 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1300 ERR("Relay sending unknown command");
1305 * relay_start: send an acknowledgment to the client to tell if we are
1306 * ready to receive data. We are ready if a session is established.
1309 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1310 struct relay_command
*cmd
)
1312 int ret
= htobe32(LTTNG_OK
);
1313 struct lttcomm_relayd_generic_reply reply
;
1314 struct relay_session
*session
= cmd
->session
;
1317 DBG("Trying to start the streaming without a session established");
1318 ret
= htobe32(LTTNG_ERR_UNK
);
1321 reply
.ret_code
= ret
;
1322 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1323 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1325 ERR("Relay sending start ack");
1332 * Append padding to the file pointed by the file descriptor fd.
1334 static int write_padding_to_file(int fd
, uint32_t size
)
1343 zeros
= zmalloc(size
);
1344 if (zeros
== NULL
) {
1345 PERROR("zmalloc zeros for padding");
1350 ret
= lttng_write(fd
, zeros
, size
);
1352 PERROR("write padding to file");
1362 * relay_recv_metadata: receive the metada for the session.
1365 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1366 struct relay_command
*cmd
)
1368 int ret
= htobe32(LTTNG_OK
);
1370 struct relay_session
*session
= cmd
->session
;
1371 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1372 struct relay_stream
*metadata_stream
;
1373 uint64_t data_size
, payload_size
;
1376 ERR("Metadata sent before version check");
1381 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1382 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1383 ERR("Incorrect data size");
1387 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1389 if (data_buffer_size
< data_size
) {
1390 /* In case the realloc fails, we can free the memory */
1393 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1394 if (!tmp_data_ptr
) {
1395 ERR("Allocating data buffer");
1400 data_buffer
= tmp_data_ptr
;
1401 data_buffer_size
= data_size
;
1403 memset(data_buffer
, 0, data_size
);
1404 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1405 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1406 if (ret
< 0 || ret
!= data_size
) {
1408 /* Orderly shutdown. Not necessary to print an error. */
1409 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1411 ERR("Relay didn't receive the whole metadata");
1416 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1419 metadata_stream
= relay_stream_find_by_id(
1420 be64toh(metadata_struct
->stream_id
));
1421 if (!metadata_stream
) {
1426 size_ret
= lttng_write(metadata_stream
->fd
, metadata_struct
->payload
,
1428 if (size_ret
< payload_size
) {
1429 ERR("Relay error writing metadata on file");
1434 ret
= write_padding_to_file(metadata_stream
->fd
,
1435 be32toh(metadata_struct
->padding_size
));
1439 metadata_stream
->ctf_trace
->metadata_received
+=
1440 payload_size
+ be32toh(metadata_struct
->padding_size
);
1442 DBG2("Relay metadata written");
1451 * relay_send_version: send relayd version number
1454 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1455 struct relay_command
*cmd
, struct lttng_ht
*sessions_ht
)
1458 struct lttcomm_relayd_version reply
, msg
;
1462 cmd
->version_check_done
= 1;
1464 /* Get version from the other side. */
1465 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1466 if (ret
< 0 || ret
!= sizeof(msg
)) {
1468 /* Orderly shutdown. Not necessary to print an error. */
1469 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1471 ERR("Relay failed to receive the version values.");
1477 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1478 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1480 /* Major versions must be the same */
1481 if (reply
.major
!= be32toh(msg
.major
)) {
1482 DBG("Incompatible major versions (%u vs %u), deleting session",
1483 reply
.major
, be32toh(msg
.major
));
1484 relay_delete_session(cmd
, sessions_ht
);
1489 cmd
->major
= reply
.major
;
1490 /* We adapt to the lowest compatible version */
1491 if (reply
.minor
<= be32toh(msg
.minor
)) {
1492 cmd
->minor
= reply
.minor
;
1494 cmd
->minor
= be32toh(msg
.minor
);
1497 reply
.major
= htobe32(reply
.major
);
1498 reply
.minor
= htobe32(reply
.minor
);
1499 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1500 sizeof(struct lttcomm_relayd_version
), 0);
1502 ERR("Relay sending version");
1505 DBG("Version check done using protocol %u.%u", cmd
->major
,
1513 * Check for data pending for a given stream id from the session daemon.
1516 int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1517 struct relay_command
*cmd
)
1519 struct relay_session
*session
= cmd
->session
;
1520 struct lttcomm_relayd_data_pending msg
;
1521 struct lttcomm_relayd_generic_reply reply
;
1522 struct relay_stream
*stream
;
1524 uint64_t last_net_seq_num
, stream_id
;
1526 DBG("Data pending command received");
1528 if (!session
|| cmd
->version_check_done
== 0) {
1529 ERR("Trying to check for data before version check");
1531 goto end_no_session
;
1534 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1535 if (ret
< sizeof(msg
)) {
1537 /* Orderly shutdown. Not necessary to print an error. */
1538 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1540 ERR("Relay didn't receive valid data_pending struct size : %d",
1544 goto end_no_session
;
1547 stream_id
= be64toh(msg
.stream_id
);
1548 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1551 stream
= relay_stream_find_by_id(stream_id
);
1552 if (stream
== NULL
) {
1557 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1558 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1561 /* Avoid wrapping issue */
1562 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1563 /* Data has in fact been written and is NOT pending */
1566 /* Data still being streamed thus pending */
1570 /* Pending check is now done. */
1571 stream
->data_pending_check_done
= 1;
1576 reply
.ret_code
= htobe32(ret
);
1577 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1579 ERR("Relay data pending ret code failed");
1587 * Wait for the control socket to reach a quiescent state.
1589 * Note that for now, when receiving this command from the session daemon, this
1590 * means that every subsequent commands or data received on the control socket
1591 * has been handled. So, this is why we simply return OK here.
1594 int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1595 struct relay_command
*cmd
)
1599 struct relay_stream
*stream
;
1600 struct lttng_ht_iter iter
;
1601 struct lttcomm_relayd_quiescent_control msg
;
1602 struct lttcomm_relayd_generic_reply reply
;
1604 DBG("Checking quiescent state on control socket");
1606 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1607 ERR("Trying to check for data before version check");
1609 goto end_no_session
;
1612 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1613 if (ret
< sizeof(msg
)) {
1615 /* Orderly shutdown. Not necessary to print an error. */
1616 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1618 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1622 goto end_no_session
;
1625 stream_id
= be64toh(msg
.stream_id
);
1628 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1630 if (stream
->stream_handle
== stream_id
) {
1631 stream
->data_pending_check_done
= 1;
1632 DBG("Relay quiescent control pending flag set to %" PRIu64
,
1639 reply
.ret_code
= htobe32(LTTNG_OK
);
1640 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1642 ERR("Relay data quiescent control ret code failed");
1650 * Initialize a data pending command. This means that a client is about to ask
1651 * for data pending for each stream he/she holds. Simply iterate over all
1652 * streams of a session and set the data_pending_check_done flag.
1654 * This command returns to the client a LTTNG_OK code.
1657 int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1658 struct relay_command
*cmd
)
1661 struct lttng_ht_iter iter
;
1662 struct lttcomm_relayd_begin_data_pending msg
;
1663 struct lttcomm_relayd_generic_reply reply
;
1664 struct relay_stream
*stream
;
1665 uint64_t session_id
;
1670 DBG("Init streams for data pending");
1672 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1673 ERR("Trying to check for data before version check");
1675 goto end_no_session
;
1678 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1679 if (ret
< sizeof(msg
)) {
1681 /* Orderly shutdown. Not necessary to print an error. */
1682 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1684 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1688 goto end_no_session
;
1691 session_id
= be64toh(msg
.session_id
);
1694 * Iterate over all streams to set the begin data pending flag. For now, the
1695 * streams are indexed by stream handle so we have to iterate over all
1696 * streams to find the one associated with the right session_id.
1699 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1701 if (stream
->session
->id
== session_id
) {
1702 stream
->data_pending_check_done
= 0;
1703 DBG("Set begin data pending flag to stream %" PRIu64
,
1704 stream
->stream_handle
);
1709 /* All good, send back reply. */
1710 reply
.ret_code
= htobe32(LTTNG_OK
);
1712 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1714 ERR("Relay begin data pending send reply failed");
1722 * End data pending command. This will check, for a given session id, if each
1723 * stream associated with it has its data_pending_check_done flag set. If not,
1724 * this means that the client lost track of the stream but the data is still
1725 * being streamed on our side. In this case, we inform the client that data is
1728 * Return to the client if there is data in flight or not with a ret_code.
1731 int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1732 struct relay_command
*cmd
)
1735 struct lttng_ht_iter iter
;
1736 struct lttcomm_relayd_end_data_pending msg
;
1737 struct lttcomm_relayd_generic_reply reply
;
1738 struct relay_stream
*stream
;
1739 uint64_t session_id
;
1740 uint32_t is_data_inflight
= 0;
1745 DBG("End data pending command");
1747 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1748 ERR("Trying to check for data before version check");
1750 goto end_no_session
;
1753 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1754 if (ret
< sizeof(msg
)) {
1756 /* Orderly shutdown. Not necessary to print an error. */
1757 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1759 ERR("Relay didn't receive valid end data_pending struct size: %d",
1763 goto end_no_session
;
1766 session_id
= be64toh(msg
.session_id
);
1768 /* Iterate over all streams to see if the begin data pending flag is set. */
1770 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1772 if (stream
->session
->id
== session_id
&&
1773 !stream
->data_pending_check_done
) {
1774 is_data_inflight
= 1;
1775 DBG("Data is still in flight for stream %" PRIu64
,
1776 stream
->stream_handle
);
1782 /* All good, send back reply. */
1783 reply
.ret_code
= htobe32(is_data_inflight
);
1785 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1787 ERR("Relay end data pending send reply failed");
1795 * Receive an index for a specific stream.
1797 * Return 0 on success else a negative value.
1800 int relay_recv_index(struct lttcomm_relayd_hdr
*recv_hdr
,
1801 struct relay_command
*cmd
)
1803 int ret
, send_ret
, index_created
= 0;
1804 struct relay_session
*session
= cmd
->session
;
1805 struct lttcomm_relayd_index index_info
;
1806 struct relay_index
*index
, *wr_index
= NULL
;
1807 struct lttcomm_relayd_generic_reply reply
;
1808 struct relay_stream
*stream
;
1809 uint64_t net_seq_num
;
1813 DBG("Relay receiving index");
1815 if (!session
|| cmd
->version_check_done
== 0) {
1816 ERR("Trying to close a stream before version check");
1818 goto end_no_session
;
1821 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &index_info
,
1822 sizeof(index_info
), 0);
1823 if (ret
< sizeof(index_info
)) {
1825 /* Orderly shutdown. Not necessary to print an error. */
1826 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1828 ERR("Relay didn't receive valid index struct size : %d", ret
);
1831 goto end_no_session
;
1834 net_seq_num
= be64toh(index_info
.net_seq_num
);
1837 stream
= relay_stream_find_by_id(be64toh(index_info
.relay_stream_id
));
1840 goto end_rcu_unlock
;
1843 /* Live beacon handling */
1844 if (index_info
.packet_size
== 0) {
1845 DBG("Received live beacon for stream %" PRIu64
, stream
->stream_handle
);
1848 * Only flag a stream inactive when it has already received data.
1850 if (stream
->total_index_received
> 0) {
1851 stream
->beacon_ts_end
= be64toh(index_info
.timestamp_end
);
1854 goto end_rcu_unlock
;
1856 stream
->beacon_ts_end
= -1ULL;
1859 index
= relay_index_find(stream
->stream_handle
, net_seq_num
);
1861 /* A successful creation will add the object to the HT. */
1862 index
= relay_index_create(stream
->stream_handle
, net_seq_num
);
1864 goto end_rcu_unlock
;
1869 copy_index_control_data(index
, &index_info
);
1871 if (index_created
) {
1873 * Try to add the relay index object to the hash table. If an object
1874 * already exist, destroy back the index created, set the data in this
1875 * object and write it on disk.
1877 relay_index_add(index
, &wr_index
);
1879 copy_index_control_data(wr_index
, &index_info
);
1883 /* The index already exists so write it on disk. */
1887 /* Do we have a writable ready index to write on disk. */
1889 /* Starting at 2.4, create the index file if none available. */
1890 if (cmd
->minor
>= 4 && stream
->index_fd
< 0) {
1891 ret
= index_create_file(stream
->path_name
, stream
->channel_name
,
1892 relayd_uid
, relayd_gid
, stream
->tracefile_size
,
1893 stream
->tracefile_count_current
);
1895 goto end_rcu_unlock
;
1897 stream
->index_fd
= ret
;
1900 ret
= relay_index_write(wr_index
->fd
, wr_index
);
1902 goto end_rcu_unlock
;
1904 stream
->total_index_received
++;
1911 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1913 reply
.ret_code
= htobe32(LTTNG_OK
);
1915 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1917 ERR("Relay sending close index id reply");
1926 * Receive the streams_sent message.
1928 * Return 0 on success else a negative value.
1931 int relay_streams_sent(struct lttcomm_relayd_hdr
*recv_hdr
,
1932 struct relay_command
*cmd
)
1935 struct lttcomm_relayd_generic_reply reply
;
1939 DBG("Relay receiving streams_sent");
1941 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1942 ERR("Trying to close a stream before version check");
1944 goto end_no_session
;
1948 * Flag every pending stream in the connection recv list that they are
1949 * ready to be used by the viewer.
1951 set_viewer_ready_flag(cmd
);
1953 reply
.ret_code
= htobe32(LTTNG_OK
);
1954 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1956 ERR("Relay sending sent_stream reply");
1968 * Process the commands received on the control socket
1971 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1972 struct relay_command
*cmd
, struct relay_local_data
*ctx
)
1976 switch (be32toh(recv_hdr
->cmd
)) {
1977 case RELAYD_CREATE_SESSION
:
1978 ret
= relay_create_session(recv_hdr
, cmd
, ctx
->sessions_ht
);
1980 case RELAYD_ADD_STREAM
:
1981 ret
= relay_add_stream(recv_hdr
, cmd
, ctx
->sessions_ht
);
1983 case RELAYD_START_DATA
:
1984 ret
= relay_start(recv_hdr
, cmd
);
1986 case RELAYD_SEND_METADATA
:
1987 ret
= relay_recv_metadata(recv_hdr
, cmd
);
1989 case RELAYD_VERSION
:
1990 ret
= relay_send_version(recv_hdr
, cmd
, ctx
->sessions_ht
);
1992 case RELAYD_CLOSE_STREAM
:
1993 ret
= relay_close_stream(recv_hdr
, cmd
);
1995 case RELAYD_DATA_PENDING
:
1996 ret
= relay_data_pending(recv_hdr
, cmd
);
1998 case RELAYD_QUIESCENT_CONTROL
:
1999 ret
= relay_quiescent_control(recv_hdr
, cmd
);
2001 case RELAYD_BEGIN_DATA_PENDING
:
2002 ret
= relay_begin_data_pending(recv_hdr
, cmd
);
2004 case RELAYD_END_DATA_PENDING
:
2005 ret
= relay_end_data_pending(recv_hdr
, cmd
);
2007 case RELAYD_SEND_INDEX
:
2008 ret
= relay_recv_index(recv_hdr
, cmd
);
2010 case RELAYD_STREAMS_SENT
:
2011 ret
= relay_streams_sent(recv_hdr
, cmd
);
2013 case RELAYD_UPDATE_SYNC_INFO
:
2015 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
2016 relay_unknown_command(cmd
);
2026 * Handle index for a data stream.
2028 * RCU read side lock MUST be acquired.
2030 * Return 0 on success else a negative value.
2032 static int handle_index_data(struct relay_stream
*stream
, uint64_t net_seq_num
,
2035 int ret
= 0, index_created
= 0;
2036 uint64_t stream_id
, data_offset
;
2037 struct relay_index
*index
, *wr_index
= NULL
;
2041 stream_id
= stream
->stream_handle
;
2042 /* Get data offset because we are about to update the index. */
2043 data_offset
= htobe64(stream
->tracefile_size_current
);
2046 * Lookup for an existing index for that stream id/sequence number. If on
2047 * exists, the control thread already received the data for it thus we need
2048 * to write it on disk.
2050 index
= relay_index_find(stream_id
, net_seq_num
);
2052 /* A successful creation will add the object to the HT. */
2053 index
= relay_index_create(stream_id
, net_seq_num
);
2061 if (rotate_index
|| stream
->index_fd
< 0) {
2062 index
->to_close_fd
= stream
->index_fd
;
2063 ret
= index_create_file(stream
->path_name
, stream
->channel_name
,
2064 relayd_uid
, relayd_gid
, stream
->tracefile_size
,
2065 stream
->tracefile_count_current
);
2067 /* This will close the stream's index fd if one. */
2068 relay_index_free_safe(index
);
2071 stream
->index_fd
= ret
;
2073 index
->fd
= stream
->index_fd
;
2074 index
->index_data
.offset
= data_offset
;
2076 if (index_created
) {
2078 * Try to add the relay index object to the hash table. If an object
2079 * already exist, destroy back the index created and set the data.
2081 relay_index_add(index
, &wr_index
);
2083 /* Copy back data from the created index. */
2084 wr_index
->fd
= index
->fd
;
2085 wr_index
->to_close_fd
= index
->to_close_fd
;
2086 wr_index
->index_data
.offset
= data_offset
;
2090 /* The index already exists so write it on disk. */
2094 /* Do we have a writable ready index to write on disk. */
2096 ret
= relay_index_write(wr_index
->fd
, wr_index
);
2100 stream
->total_index_received
++;
2108 * relay_process_data: Process the data received on the data socket
2111 int relay_process_data(struct relay_command
*cmd
)
2113 int ret
= 0, rotate_index
= 0;
2115 struct relay_stream
*stream
;
2116 struct lttcomm_relayd_data_hdr data_hdr
;
2118 uint64_t net_seq_num
;
2121 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &data_hdr
,
2122 sizeof(struct lttcomm_relayd_data_hdr
), 0);
2125 /* Orderly shutdown. Not necessary to print an error. */
2126 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
2128 ERR("Unable to receive data header on sock %d", cmd
->sock
->fd
);
2134 stream_id
= be64toh(data_hdr
.stream_id
);
2137 stream
= relay_stream_find_by_id(stream_id
);
2140 goto end_rcu_unlock
;
2143 data_size
= be32toh(data_hdr
.data_size
);
2144 if (data_buffer_size
< data_size
) {
2147 tmp_data_ptr
= realloc(data_buffer
, data_size
);
2148 if (!tmp_data_ptr
) {
2149 ERR("Allocating data buffer");
2152 goto end_rcu_unlock
;
2154 data_buffer
= tmp_data_ptr
;
2155 data_buffer_size
= data_size
;
2157 memset(data_buffer
, 0, data_size
);
2159 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
2161 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
2162 data_size
, stream_id
, net_seq_num
);
2163 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
2166 /* Orderly shutdown. Not necessary to print an error. */
2167 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
2170 goto end_rcu_unlock
;
2173 /* Check if a rotation is needed. */
2174 if (stream
->tracefile_size
> 0 &&
2175 (stream
->tracefile_size_current
+ data_size
) >
2176 stream
->tracefile_size
) {
2177 struct relay_viewer_stream
*vstream
;
2180 new_id
= (stream
->tracefile_count_current
+ 1) %
2181 stream
->tracefile_count
;
2183 * When we wrap-around back to 0, we start overwriting old
2186 if (!stream
->tracefile_overwrite
&& new_id
== 0) {
2187 stream
->tracefile_overwrite
= 1;
2189 pthread_mutex_lock(&stream
->viewer_stream_rotation_lock
);
2190 if (stream
->tracefile_overwrite
) {
2191 stream
->oldest_tracefile_id
=
2192 (stream
->oldest_tracefile_id
+ 1) %
2193 stream
->tracefile_count
;
2195 vstream
= live_find_viewer_stream_by_id(stream
->stream_handle
);
2198 * The viewer is reading a file about to be
2199 * overwritten. Close the FDs it is
2200 * currently using and let it handle the fault.
2202 if (vstream
->tracefile_count_current
== new_id
) {
2203 pthread_mutex_lock(&vstream
->overwrite_lock
);
2204 vstream
->abort_flag
= 1;
2205 pthread_mutex_unlock(&vstream
->overwrite_lock
);
2206 DBG("Streaming side setting abort_flag on stream %s_%lu\n",
2207 stream
->channel_name
, new_id
);
2208 } else if (vstream
->tracefile_count_current
==
2209 stream
->tracefile_count_current
) {
2211 * The reader and writer were in the
2212 * same trace file, inform the viewer
2213 * that no new index will ever be added
2216 vstream
->close_write_flag
= 1;
2219 ret
= utils_rotate_stream_file(stream
->path_name
, stream
->channel_name
,
2220 stream
->tracefile_size
, stream
->tracefile_count
,
2221 relayd_uid
, relayd_gid
, stream
->fd
,
2222 &(stream
->tracefile_count_current
), &stream
->fd
);
2223 stream
->total_index_received
= 0;
2224 pthread_mutex_unlock(&stream
->viewer_stream_rotation_lock
);
2226 ERR("Rotating stream output file");
2227 goto end_rcu_unlock
;
2229 /* Reset current size because we just perform a stream rotation. */
2230 stream
->tracefile_size_current
= 0;
2235 * Index are handled in protocol version 2.4 and above. Also, snapshot and
2236 * index are NOT supported.
2238 if (stream
->session
->minor
>= 4 && !stream
->session
->snapshot
) {
2239 ret
= handle_index_data(stream
, net_seq_num
, rotate_index
);
2241 goto end_rcu_unlock
;
2245 /* Write data to stream output fd. */
2246 size_ret
= lttng_write(stream
->fd
, data_buffer
, data_size
);
2247 if (size_ret
< data_size
) {
2248 ERR("Relay error writing data to file");
2250 goto end_rcu_unlock
;
2253 DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64
,
2254 ret
, stream
->stream_handle
);
2256 ret
= write_padding_to_file(stream
->fd
, be32toh(data_hdr
.padding_size
));
2258 goto end_rcu_unlock
;
2260 stream
->tracefile_size_current
+= data_size
+ be32toh(data_hdr
.padding_size
);
2262 stream
->prev_seq
= net_seq_num
;
2264 /* Check if we need to close the FD */
2265 if (close_stream_check(stream
)) {
2266 destroy_stream(stream
);
2276 void relay_cleanup_poll_connection(struct lttng_poll_event
*events
, int pollfd
)
2280 lttng_poll_del(events
, pollfd
);
2282 ret
= close(pollfd
);
2284 ERR("Closing pollfd %d", pollfd
);
2289 int relay_add_connection(int fd
, struct lttng_poll_event
*events
,
2290 struct lttng_ht
*relay_connections_ht
)
2292 struct relay_command
*relay_connection
;
2295 relay_connection
= zmalloc(sizeof(struct relay_command
));
2296 if (relay_connection
== NULL
) {
2297 PERROR("Relay command zmalloc");
2300 ret
= lttng_read(fd
, relay_connection
, sizeof(struct relay_command
));
2301 if (ret
< sizeof(struct relay_command
)) {
2302 PERROR("read relay cmd pipe");
2305 CDS_INIT_LIST_HEAD(&relay_connection
->recv_head
);
2308 * Only used by the control side and the reference is copied inside each
2309 * stream from that connection. Thus a destroy HT must be done after every
2310 * stream has been destroyed.
2312 if (relay_connection
->type
== RELAY_CONTROL
) {
2313 relay_connection
->ctf_traces_ht
= lttng_ht_new(0,
2314 LTTNG_HT_TYPE_STRING
);
2315 if (!relay_connection
->ctf_traces_ht
) {
2320 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
2321 (unsigned long) relay_connection
->sock
->fd
);
2323 lttng_ht_add_unique_ulong(relay_connections_ht
,
2324 &relay_connection
->sock_n
);
2326 return lttng_poll_add(events
,
2327 relay_connection
->sock
->fd
,
2328 LPOLLIN
| LPOLLRDHUP
);
2331 free(relay_connection
);
2337 void deferred_free_connection(struct rcu_head
*head
)
2339 struct relay_command
*relay_connection
=
2340 caa_container_of(head
, struct relay_command
, rcu_node
);
2342 lttcomm_destroy_sock(relay_connection
->sock
);
2343 free(relay_connection
);
2347 void relay_del_connection(struct lttng_ht
*relay_connections_ht
,
2348 struct lttng_ht_iter
*iter
, struct relay_command
*relay_connection
,
2349 struct lttng_ht
*sessions_ht
)
2353 ret
= lttng_ht_del(relay_connections_ht
, iter
);
2356 if (relay_connection
->type
== RELAY_CONTROL
) {
2357 struct relay_stream_recv_handle
*node
, *tmp_node
;
2359 relay_delete_session(relay_connection
, sessions_ht
);
2360 lttng_ht_destroy(relay_connection
->ctf_traces_ht
);
2362 /* Clean up recv list. */
2363 cds_list_for_each_entry_safe(node
, tmp_node
,
2364 &relay_connection
->recv_head
, node
) {
2365 cds_list_del(&node
->node
);
2370 call_rcu(&relay_connection
->rcu_node
, deferred_free_connection
);
2374 * This thread does the actual work
2377 void *relay_thread_worker(void *data
)
2379 int ret
, err
= -1, last_seen_data_fd
= -1;
2381 struct relay_command
*relay_connection
;
2382 struct lttng_poll_event events
;
2383 struct lttng_ht
*relay_connections_ht
;
2384 struct lttng_ht_node_ulong
*node
;
2385 struct lttng_ht_iter iter
;
2386 struct lttcomm_relayd_hdr recv_hdr
;
2387 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
2388 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
2390 DBG("[thread] Relay worker started");
2392 rcu_register_thread();
2394 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
2396 health_code_update();
2398 /* table of connections indexed on socket */
2399 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2400 if (!relay_connections_ht
) {
2401 goto relay_connections_ht_error
;
2404 /* Tables of received indexes indexed by index handle and net_seq_num. */
2405 indexes_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_TWO_U64
);
2407 goto indexes_ht_error
;
2410 ret
= create_thread_poll_set(&events
, 2);
2412 goto error_poll_create
;
2415 ret
= lttng_poll_add(&events
, relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
2422 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
2424 health_code_update();
2426 /* Infinite blocking call, waiting for transmission */
2427 DBG3("Relayd worker thread polling...");
2428 health_poll_entry();
2429 ret
= lttng_poll_wait(&events
, -1);
2433 * Restart interrupted system call.
2435 if (errno
== EINTR
) {
2444 * Process control. The control connection is prioritised so we don't
2445 * starve it with high throughout put tracing data on the data
2448 for (i
= 0; i
< nb_fd
; i
++) {
2449 /* Fetch once the poll data */
2450 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2451 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2453 health_code_update();
2455 /* Thread quit pipe has been closed. Killing thread. */
2456 ret
= check_thread_quit_pipe(pollfd
, revents
);
2462 /* Inspect the relay cmd pipe for new connection */
2463 if (pollfd
== relay_cmd_pipe
[0]) {
2464 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2465 ERR("Relay pipe error");
2467 } else if (revents
& LPOLLIN
) {
2468 DBG("Relay command received");
2469 ret
= relay_add_connection(relay_cmd_pipe
[0],
2470 &events
, relay_connections_ht
);
2475 } else if (revents
) {
2477 lttng_ht_lookup(relay_connections_ht
,
2478 (void *)((unsigned long) pollfd
),
2480 node
= lttng_ht_iter_get_node_ulong(&iter
);
2482 DBG2("Relay sock %d not found", pollfd
);
2486 relay_connection
= caa_container_of(node
,
2487 struct relay_command
, sock_n
);
2489 if (revents
& (LPOLLERR
)) {
2491 relay_cleanup_poll_connection(&events
, pollfd
);
2492 relay_del_connection(relay_connections_ht
,
2493 &iter
, relay_connection
, sessions_ht
);
2494 if (last_seen_data_fd
== pollfd
) {
2495 last_seen_data_fd
= last_notdel_data_fd
;
2497 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
2498 DBG("Socket %d hung up", pollfd
);
2499 relay_cleanup_poll_connection(&events
, pollfd
);
2500 relay_del_connection(relay_connections_ht
,
2501 &iter
, relay_connection
, sessions_ht
);
2502 if (last_seen_data_fd
== pollfd
) {
2503 last_seen_data_fd
= last_notdel_data_fd
;
2505 } else if (revents
& LPOLLIN
) {
2506 /* control socket */
2507 if (relay_connection
->type
== RELAY_CONTROL
) {
2508 ret
= relay_connection
->sock
->ops
->recvmsg(
2509 relay_connection
->sock
, &recv_hdr
,
2510 sizeof(struct lttcomm_relayd_hdr
), 0);
2511 /* connection closed */
2513 relay_cleanup_poll_connection(&events
, pollfd
);
2514 relay_del_connection(relay_connections_ht
,
2515 &iter
, relay_connection
, sessions_ht
);
2516 DBG("Control connection closed with %d", pollfd
);
2518 if (relay_connection
->session
) {
2519 DBG2("Relay worker receiving data for session : %" PRIu64
,
2520 relay_connection
->session
->id
);
2522 ret
= relay_process_control(&recv_hdr
,
2523 relay_connection
, relay_ctx
);
2525 /* Clear the session on error. */
2526 relay_cleanup_poll_connection(&events
, pollfd
);
2527 relay_del_connection(relay_connections_ht
,
2528 &iter
, relay_connection
, sessions_ht
);
2529 DBG("Connection closed with %d", pollfd
);
2535 * Flag the last seen data fd not deleted. It will be
2536 * used as the last seen fd if any fd gets deleted in
2539 last_notdel_data_fd
= pollfd
;
2547 * The last loop handled a control request, go back to poll to make
2548 * sure we prioritise the control socket.
2554 if (last_seen_data_fd
>= 0) {
2555 for (i
= 0; i
< nb_fd
; i
++) {
2556 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2558 health_code_update();
2560 if (last_seen_data_fd
== pollfd
) {
2567 /* Process data connection. */
2568 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
2569 /* Fetch the poll data. */
2570 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2571 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2573 health_code_update();
2575 /* Skip the command pipe. It's handled in the first loop. */
2576 if (pollfd
== relay_cmd_pipe
[0]) {
2582 lttng_ht_lookup(relay_connections_ht
,
2583 (void *)((unsigned long) pollfd
),
2585 node
= lttng_ht_iter_get_node_ulong(&iter
);
2587 /* Skip it. Might be removed before. */
2591 relay_connection
= caa_container_of(node
,
2592 struct relay_command
, sock_n
);
2594 if (revents
& LPOLLIN
) {
2595 if (relay_connection
->type
!= RELAY_DATA
) {
2599 ret
= relay_process_data(relay_connection
);
2600 /* connection closed */
2602 relay_cleanup_poll_connection(&events
, pollfd
);
2603 relay_del_connection(relay_connections_ht
,
2604 &iter
, relay_connection
, sessions_ht
);
2605 DBG("Data connection closed with %d", pollfd
);
2607 * Every goto restart call sets the last seen fd where
2608 * here we don't really care since we gracefully
2609 * continue the loop after the connection is deleted.
2612 /* Keep last seen port. */
2613 last_seen_data_fd
= pollfd
;
2621 last_seen_data_fd
= -1;
2624 /* Normal exit, no error */
2629 lttng_poll_clean(&events
);
2631 /* empty the hash table and free the memory */
2633 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
2634 health_code_update();
2636 node
= lttng_ht_iter_get_node_ulong(&iter
);
2638 relay_connection
= caa_container_of(node
,
2639 struct relay_command
, sock_n
);
2640 relay_del_connection(relay_connections_ht
,
2641 &iter
, relay_connection
, sessions_ht
);
2646 lttng_ht_destroy(indexes_ht
);
2648 lttng_ht_destroy(relay_connections_ht
);
2649 relay_connections_ht_error
:
2650 /* Close relay cmd pipes */
2651 utils_close_pipe(relay_cmd_pipe
);
2653 DBG("Thread exited with error");
2655 DBG("Worker thread cleanup complete");
2659 ERR("Health error occurred in %s", __func__
);
2661 health_unregister(health_relayd
);
2662 rcu_unregister_thread();
2668 * Create the relay command pipe to wake thread_manage_apps.
2669 * Closed in cleanup().
2671 static int create_relay_cmd_pipe(void)
2675 ret
= utils_create_pipe_cloexec(relay_cmd_pipe
);
2683 int main(int argc
, char **argv
)
2687 struct relay_local_data
*relay_ctx
;
2689 /* Create thread quit pipe */
2690 if ((ret
= init_thread_quit_pipe()) < 0) {
2694 /* Parse arguments */
2696 if ((ret
= parse_args(argc
, argv
)) < 0) {
2700 if ((ret
= set_signal_handler()) < 0) {
2704 /* Try to create directory if -o, --output is specified. */
2705 if (opt_output_path
) {
2706 if (*opt_output_path
!= '/') {
2707 ERR("Please specify an absolute path for -o, --output PATH");
2711 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
);
2713 ERR("Unable to create %s", opt_output_path
);
2727 /* We need those values for the file/dir creation. */
2728 relayd_uid
= getuid();
2729 relayd_gid
= getgid();
2731 /* Check if daemon is UID = 0 */
2732 if (relayd_uid
== 0) {
2733 if (control_uri
->port
< 1024 || data_uri
->port
< 1024 ||
2734 live_uri
->port
< 1024) {
2735 ERR("Need to be root to use ports < 1024");
2741 /* Setup the thread apps communication pipe. */
2742 if ((ret
= create_relay_cmd_pipe()) < 0) {
2746 /* Init relay command queue. */
2747 cds_wfq_init(&relay_cmd_queue
.queue
);
2749 /* Set up max poll set size */
2750 lttng_poll_set_max_size();
2752 /* Initialize communication library */
2755 relay_ctx
= zmalloc(sizeof(struct relay_local_data
));
2757 PERROR("relay_ctx");
2761 /* tables of sessions indexed by session ID */
2762 relay_ctx
->sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2763 if (!relay_ctx
->sessions_ht
) {
2764 goto exit_relay_ctx_sessions
;
2767 /* tables of streams indexed by stream ID */
2768 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2769 if (!relay_streams_ht
) {
2770 goto exit_relay_ctx_streams
;
2773 /* tables of streams indexed by stream ID */
2774 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2775 if (!viewer_streams_ht
) {
2776 goto exit_relay_ctx_viewer_streams
;
2779 /* Initialize thread health monitoring */
2780 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
2781 if (!health_relayd
) {
2782 PERROR("health_app_create error");
2783 goto exit_health_app_create
;
2786 ret
= utils_create_pipe(health_quit_pipe
);
2788 goto error_health_pipe
;
2791 /* Create thread to manage the client socket */
2792 ret
= pthread_create(&health_thread
, NULL
,
2793 thread_manage_health
, (void *) NULL
);
2795 PERROR("pthread_create health");
2799 /* Setup the dispatcher thread */
2800 ret
= pthread_create(&dispatcher_thread
, NULL
,
2801 relay_thread_dispatcher
, (void *) NULL
);
2803 PERROR("pthread_create dispatcher");
2804 goto exit_dispatcher
;
2807 /* Setup the worker thread */
2808 ret
= pthread_create(&worker_thread
, NULL
,
2809 relay_thread_worker
, (void *) relay_ctx
);
2811 PERROR("pthread_create worker");
2815 /* Setup the listener thread */
2816 ret
= pthread_create(&listener_thread
, NULL
,
2817 relay_thread_listener
, (void *) NULL
);
2819 PERROR("pthread_create listener");
2823 ret
= live_start_threads(live_uri
, relay_ctx
, thread_quit_pipe
);
2825 ERR("Starting live viewer threads");
2830 ret
= pthread_join(listener_thread
, &status
);
2832 PERROR("pthread_join");
2833 goto error
; /* join error, exit without cleanup */
2837 ret
= pthread_join(worker_thread
, &status
);
2839 PERROR("pthread_join");
2840 goto error
; /* join error, exit without cleanup */
2844 ret
= pthread_join(dispatcher_thread
, &status
);
2846 PERROR("pthread_join");
2847 goto error
; /* join error, exit without cleanup */
2851 ret
= pthread_join(health_thread
, &status
);
2853 PERROR("pthread_join health thread");
2854 goto error
; /* join error, exit without cleanup */
2858 * Stop live threads only after joining other threads.
2860 live_stop_threads();
2863 utils_close_pipe(health_quit_pipe
);
2866 health_app_destroy(health_relayd
);
2868 exit_health_app_create
:
2869 lttng_ht_destroy(viewer_streams_ht
);
2871 exit_relay_ctx_viewer_streams
:
2872 lttng_ht_destroy(relay_streams_ht
);
2874 exit_relay_ctx_streams
:
2875 lttng_ht_destroy(relay_ctx
->sessions_ht
);
2877 exit_relay_ctx_sessions
: