2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
37 #include <urcu/futex.h>
38 #include <urcu/uatomic.h>
43 #include <lttng/lttng.h>
44 #include <common/common.h>
45 #include <common/compat/poll.h>
46 #include <common/compat/socket.h>
47 #include <common/compat/endian.h>
48 #include <common/defaults.h>
49 #include <common/daemonize.h>
50 #include <common/futex.h>
51 #include <common/sessiond-comm/sessiond-comm.h>
52 #include <common/sessiond-comm/inet.h>
53 #include <common/sessiond-comm/relayd.h>
54 #include <common/uri.h>
55 #include <common/utils.h>
56 #include <common/config/config.h>
59 #include "ctf-trace.h"
62 #include "lttng-relayd.h"
64 #include "health-relayd.h"
65 #include "testpoint.h"
66 #include "viewer-stream.h"
69 #include "connection.h"
71 /* command line options */
72 char *opt_output_path
;
73 static int opt_daemon
, opt_background
;
76 * We need to wait for listener and live listener threads, as well as
77 * health check thread, before being ready to signal readiness.
79 #define NR_LTTNG_RELAY_READY 3
80 static int lttng_relay_ready
= NR_LTTNG_RELAY_READY
;
81 static int recv_child_signal
; /* Set to 1 when a SIGUSR1 signal is received. */
82 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
84 static struct lttng_uri
*control_uri
;
85 static struct lttng_uri
*data_uri
;
86 static struct lttng_uri
*live_uri
;
90 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
91 static int tracing_group_name_override
;
93 const char * const config_section_name
= "relayd";
96 * Quit pipe for all threads. This permits a single cancellation point
97 * for all threads when receiving an event on the pipe.
99 int thread_quit_pipe
[2] = { -1, -1 };
102 * This pipe is used to inform the worker thread that a command is queued and
103 * ready to be processed.
105 static int relay_conn_pipe
[2] = { -1, -1 };
107 /* Shared between threads */
108 static int dispatch_thread_exit
;
110 static pthread_t listener_thread
;
111 static pthread_t dispatcher_thread
;
112 static pthread_t worker_thread
;
113 static pthread_t health_thread
;
115 static uint64_t last_relay_stream_id
;
118 * Relay command queue.
120 * The relay_thread_listener and relay_thread_dispatcher communicate with this
123 static struct relay_conn_queue relay_conn_queue
;
125 /* buffer allocated at startup, used to store the trace data */
126 static char *data_buffer
;
127 static unsigned int data_buffer_size
;
129 /* We need those values for the file/dir creation. */
130 static uid_t relayd_uid
;
131 static gid_t relayd_gid
;
133 /* Global relay stream hash table. */
134 struct lttng_ht
*relay_streams_ht
;
136 /* Global relay viewer stream hash table. */
137 struct lttng_ht
*viewer_streams_ht
;
139 /* Global hash table that stores relay index object. */
140 struct lttng_ht
*indexes_ht
;
142 /* Relayd health monitoring */
143 struct health_app
*health_relayd
;
145 static struct option long_options
[] = {
146 { "control-port", 1, 0, 'C', },
147 { "data-port", 1, 0, 'D', },
148 { "live-port", 1, 0, 'L', },
149 { "daemonize", 0, 0, 'd', },
150 { "background", 0, 0, 'b', },
151 { "group", 1, 0, 'g', },
152 { "help", 0, 0, 'h', },
153 { "output", 1, 0, 'o', },
154 { "verbose", 0, 0, 'v', },
155 { "config", 1, 0, 'f' },
159 static const char *config_ignore_options
[] = { "help", "config" };
162 * usage function on stderr
167 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
168 fprintf(stderr
, " -h, --help Display this usage.\n");
169 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
170 fprintf(stderr
, " -b, --background Start as a daemon, keeping console open.\n");
171 fprintf(stderr
, " -C, --control-port URL Control port listening.\n");
172 fprintf(stderr
, " -D, --data-port URL Data port listening.\n");
173 fprintf(stderr
, " -L, --live-port URL Live view port listening.\n");
174 fprintf(stderr
, " -o, --output PATH Output path for traces. Must use an absolute path.\n");
175 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
176 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
177 fprintf(stderr
, " -f --config Load daemon configuration file\n");
181 * Take an option from the getopt output and set it in the right variable to be
184 * Return 0 on success else a negative value.
187 int set_option(int opt
, const char *arg
, const char *optname
)
193 fprintf(stderr
, "option %s", optname
);
195 fprintf(stderr
, " with arg %s\n", arg
);
199 ret
= uri_parse(arg
, &control_uri
);
201 ERR("Invalid control URI specified");
204 if (control_uri
->port
== 0) {
205 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
209 ret
= uri_parse(arg
, &data_uri
);
211 ERR("Invalid data URI specified");
214 if (data_uri
->port
== 0) {
215 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
219 ret
= uri_parse(arg
, &live_uri
);
221 ERR("Invalid live URI specified");
224 if (live_uri
->port
== 0) {
225 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
235 tracing_group_name
= strdup(arg
);
236 if (tracing_group_name
== NULL
) {
241 tracing_group_name_override
= 1;
247 ret
= asprintf(&opt_output_path
, "%s", arg
);
250 PERROR("asprintf opt_output_path");
255 /* Verbose level can increase using multiple -v */
257 lttng_opt_verbose
= config_parse_value(arg
);
259 /* Only 3 level of verbosity (-vvv). */
260 if (lttng_opt_verbose
< 3) {
261 lttng_opt_verbose
+= 1;
266 /* Unknown option or other error.
267 * Error is printed by getopt, just return */
280 * config_entry_handler_cb used to handle options read from a config file.
281 * See config_entry_handler_cb comment in common/config/config.h for the
282 * return value conventions.
285 int config_entry_handler(const struct config_entry
*entry
, void *unused
)
289 if (!entry
|| !entry
->name
|| !entry
->value
) {
294 /* Check if the option is to be ignored */
295 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
296 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
301 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1; i
++) {
302 /* Ignore if entry name is not fully matched. */
303 if (strcmp(entry
->name
, long_options
[i
].name
)) {
308 * If the option takes no argument on the command line, we have to
309 * check if the value is "true". We support non-zero numeric values,
312 if (!long_options
[i
].has_arg
) {
313 ret
= config_parse_value(entry
->value
);
316 WARN("Invalid configuration value \"%s\" for option %s",
317 entry
->value
, entry
->name
);
319 /* False, skip boolean config option. */
324 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
328 WARN("Unrecognized option \"%s\" in daemon configuration file.",
336 int set_options(int argc
, char **argv
)
338 int c
, ret
= 0, option_index
= 0;
339 int orig_optopt
= optopt
, orig_optind
= optind
;
340 char *default_address
, *optstring
;
341 const char *config_path
= NULL
;
343 optstring
= utils_generate_optstring(long_options
,
344 sizeof(long_options
) / sizeof(struct option
));
350 /* Check for the --config option */
352 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
353 &option_index
)) != -1) {
357 } else if (c
!= 'f') {
361 config_path
= utils_expand_path(optarg
);
363 ERR("Failed to resolve path: %s", optarg
);
367 ret
= config_get_section_entries(config_path
, config_section_name
,
368 config_entry_handler
, NULL
);
371 ERR("Invalid configuration option at line %i", ret
);
377 /* Reset getopt's global state */
378 optopt
= orig_optopt
;
379 optind
= orig_optind
;
381 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
386 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
392 /* assign default values */
393 if (control_uri
== NULL
) {
394 ret
= asprintf(&default_address
,
395 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS
":%d",
396 DEFAULT_NETWORK_CONTROL_PORT
);
398 PERROR("asprintf default data address");
402 ret
= uri_parse(default_address
, &control_uri
);
403 free(default_address
);
405 ERR("Invalid control URI specified");
409 if (data_uri
== NULL
) {
410 ret
= asprintf(&default_address
,
411 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS
":%d",
412 DEFAULT_NETWORK_DATA_PORT
);
414 PERROR("asprintf default data address");
418 ret
= uri_parse(default_address
, &data_uri
);
419 free(default_address
);
421 ERR("Invalid data URI specified");
425 if (live_uri
== NULL
) {
426 ret
= asprintf(&default_address
,
427 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS
":%d",
428 DEFAULT_NETWORK_VIEWER_PORT
);
430 PERROR("asprintf default viewer control address");
434 ret
= uri_parse(default_address
, &live_uri
);
435 free(default_address
);
437 ERR("Invalid viewer control URI specified");
455 /* free the dynamically allocated opt_output_path */
456 free(opt_output_path
);
458 /* Close thread quit pipes */
459 utils_close_pipe(thread_quit_pipe
);
461 uri_free(control_uri
);
463 /* Live URI is freed in the live thread. */
465 if (tracing_group_name_override
) {
466 free((void *) tracing_group_name
);
471 * Write to writable pipe used to notify a thread.
474 int notify_thread_pipe(int wpipe
)
478 ret
= lttng_write(wpipe
, "!", 1);
480 PERROR("write poll pipe");
486 static void notify_health_quit_pipe(int *pipe
)
490 ret
= lttng_write(pipe
[1], "4", 1);
492 PERROR("write relay health quit");
497 * Stop all threads by closing the thread quit pipe.
500 void stop_threads(void)
504 /* Stopping all threads */
505 DBG("Terminating all threads");
506 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
508 ERR("write error on thread quit pipe");
511 notify_health_quit_pipe(health_quit_pipe
);
513 /* Dispatch thread */
514 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
515 futex_nto1_wake(&relay_conn_queue
.futex
);
519 * Signal handler for the daemon
521 * Simply stop all worker threads, leaving main() return gracefully after
522 * joining all threads and calling cleanup().
525 void sighandler(int sig
)
529 DBG("SIGPIPE caught");
532 DBG("SIGINT caught");
536 DBG("SIGTERM caught");
540 CMM_STORE_SHARED(recv_child_signal
, 1);
548 * Setup signal handler for :
549 * SIGINT, SIGTERM, SIGPIPE
552 int set_signal_handler(void)
558 if ((ret
= sigemptyset(&sigset
)) < 0) {
559 PERROR("sigemptyset");
563 sa
.sa_handler
= sighandler
;
566 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
571 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
576 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
581 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
586 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
591 void lttng_relay_notify_ready(void)
593 /* Notify the parent of the fork() process that we are ready. */
594 if (opt_daemon
|| opt_background
) {
595 if (uatomic_sub_return(<tng_relay_ready
, 1) == 0) {
596 kill(child_ppid
, SIGUSR1
);
602 * Init thread quit pipe.
604 * Return -1 on error or 0 if all pipes are created.
607 int init_thread_quit_pipe(void)
611 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
617 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
620 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
624 if (events
== NULL
|| size
== 0) {
629 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
635 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
647 * Check if the thread quit pipe was triggered.
649 * Return 1 if it was triggered else 0;
652 int check_thread_quit_pipe(int fd
, uint32_t events
)
654 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
662 * Create and init socket from uri.
665 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
668 struct lttcomm_sock
*sock
= NULL
;
670 sock
= lttcomm_alloc_sock_from_uri(uri
);
672 ERR("Allocating socket");
676 ret
= lttcomm_create_sock(sock
);
680 DBG("Listening on sock %d", sock
->fd
);
682 ret
= sock
->ops
->bind(sock
);
687 ret
= sock
->ops
->listen(sock
, -1);
697 lttcomm_destroy_sock(sock
);
703 * Return nonzero if stream needs to be closed.
706 int close_stream_check(struct relay_stream
*stream
)
708 if (stream
->close_flag
&& stream
->prev_seq
== stream
->last_net_seq_num
) {
710 * We are about to close the stream so set the data pending flag to 1
711 * which will make the end data pending command skip the stream which
712 * is now closed and ready. Note that after proceeding to a file close,
713 * the written file is ready for reading.
715 stream
->data_pending_check_done
= 1;
721 static void try_close_stream(struct relay_session
*session
,
722 struct relay_stream
*stream
)
725 struct ctf_trace
*ctf_trace
;
730 if (!close_stream_check(stream
)) {
731 /* Can't close it, not ready for that. */
735 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
739 pthread_mutex_lock(&session
->viewer_ready_lock
);
740 ctf_trace
->invalid_flag
= 1;
741 pthread_mutex_unlock(&session
->viewer_ready_lock
);
743 ret
= stream_close(session
, stream
);
744 if (ret
|| session
->snapshot
) {
745 /* Already close thus the ctf trace is being or has been destroyed. */
749 ctf_trace_try_destroy(session
, ctf_trace
);
756 * This thread manages the listening for new connections on the network
759 void *relay_thread_listener(void *data
)
761 int i
, ret
, pollfd
, err
= -1;
762 uint32_t revents
, nb_fd
;
763 struct lttng_poll_event events
;
764 struct lttcomm_sock
*control_sock
, *data_sock
;
766 DBG("[thread] Relay listener started");
768 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
770 health_code_update();
772 control_sock
= relay_init_sock(control_uri
);
774 goto error_sock_control
;
777 data_sock
= relay_init_sock(data_uri
);
779 goto error_sock_relay
;
783 * Pass 3 as size here for the thread quit pipe, control and data socket.
785 ret
= create_thread_poll_set(&events
, 3);
787 goto error_create_poll
;
790 /* Add the control socket */
791 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
796 /* Add the data socket */
797 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
802 lttng_relay_notify_ready();
804 if (testpoint(relayd_thread_listener
)) {
805 goto error_testpoint
;
809 health_code_update();
811 DBG("Listener accepting connections");
815 ret
= lttng_poll_wait(&events
, -1);
819 * Restart interrupted system call.
821 if (errno
== EINTR
) {
829 DBG("Relay new connection received");
830 for (i
= 0; i
< nb_fd
; i
++) {
831 health_code_update();
833 /* Fetch once the poll data */
834 revents
= LTTNG_POLL_GETEV(&events
, i
);
835 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
838 /* No activity for this FD (poll implementation). */
842 /* Thread quit pipe has been closed. Killing thread. */
843 ret
= check_thread_quit_pipe(pollfd
, revents
);
849 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
850 ERR("socket poll error");
852 } else if (revents
& LPOLLIN
) {
854 * Get allocated in this thread, enqueued to a global queue,
855 * dequeued and freed in the worker thread.
858 struct relay_connection
*new_conn
;
859 struct lttcomm_sock
*newsock
;
861 new_conn
= connection_create();
866 if (pollfd
== data_sock
->fd
) {
867 new_conn
->type
= RELAY_DATA
;
868 newsock
= data_sock
->ops
->accept(data_sock
);
869 DBG("Relay data connection accepted, socket %d",
872 assert(pollfd
== control_sock
->fd
);
873 new_conn
->type
= RELAY_CONTROL
;
874 newsock
= control_sock
->ops
->accept(control_sock
);
875 DBG("Relay control connection accepted, socket %d",
879 PERROR("accepting sock");
880 connection_free(new_conn
);
884 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
887 PERROR("setsockopt inet");
888 lttcomm_destroy_sock(newsock
);
889 connection_free(new_conn
);
892 new_conn
->sock
= newsock
;
894 /* Enqueue request for the dispatcher thread. */
895 cds_wfcq_enqueue(&relay_conn_queue
.head
, &relay_conn_queue
.tail
,
899 * Wake the dispatch queue futex. Implicit memory barrier with
900 * the exchange in cds_wfcq_enqueue.
902 futex_nto1_wake(&relay_conn_queue
.futex
);
911 lttng_poll_clean(&events
);
913 if (data_sock
->fd
>= 0) {
914 ret
= data_sock
->ops
->close(data_sock
);
919 lttcomm_destroy_sock(data_sock
);
921 if (control_sock
->fd
>= 0) {
922 ret
= control_sock
->ops
->close(control_sock
);
927 lttcomm_destroy_sock(control_sock
);
931 ERR("Health error occurred in %s", __func__
);
933 health_unregister(health_relayd
);
934 DBG("Relay listener thread cleanup complete");
940 * This thread manages the dispatching of the requests to worker threads
943 void *relay_thread_dispatcher(void *data
)
947 struct cds_wfcq_node
*node
;
948 struct relay_connection
*new_conn
= NULL
;
950 DBG("[thread] Relay dispatcher started");
952 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
954 if (testpoint(relayd_thread_dispatcher
)) {
955 goto error_testpoint
;
958 health_code_update();
960 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
961 health_code_update();
963 /* Atomically prepare the queue futex */
964 futex_nto1_prepare(&relay_conn_queue
.futex
);
967 health_code_update();
969 /* Dequeue commands */
970 node
= cds_wfcq_dequeue_blocking(&relay_conn_queue
.head
,
971 &relay_conn_queue
.tail
);
973 DBG("Woken up but nothing in the relay command queue");
974 /* Continue thread execution */
977 new_conn
= caa_container_of(node
, struct relay_connection
, qnode
);
979 DBG("Dispatching request waiting on sock %d", new_conn
->sock
->fd
);
982 * Inform worker thread of the new request. This call is blocking
983 * so we can be assured that the data will be read at some point in
984 * time or wait to the end of the world :)
986 ret
= lttng_write(relay_conn_pipe
[1], &new_conn
, sizeof(new_conn
));
988 PERROR("write connection pipe");
989 connection_destroy(new_conn
);
992 } while (node
!= NULL
);
994 /* Futex wait on queue. Blocking call on futex() */
996 futex_nto1_wait(&relay_conn_queue
.futex
);
1000 /* Normal exit, no error */
1007 ERR("Health error occurred in %s", __func__
);
1009 health_unregister(health_relayd
);
1010 DBG("Dispatch thread dying");
1015 static void try_close_streams(struct relay_session
*session
)
1017 struct ctf_trace
*ctf_trace
;
1018 struct lttng_ht_iter iter
;
1022 pthread_mutex_lock(&session
->viewer_ready_lock
);
1024 cds_lfht_for_each_entry(session
->ctf_traces_ht
->ht
, &iter
.iter
, ctf_trace
,
1026 struct relay_stream
*stream
;
1028 /* Close streams. */
1029 cds_list_for_each_entry(stream
, &ctf_trace
->stream_list
, trace_list
) {
1030 stream_close(session
, stream
);
1033 ctf_trace
->invalid_flag
= 1;
1034 ctf_trace_try_destroy(session
, ctf_trace
);
1037 pthread_mutex_unlock(&session
->viewer_ready_lock
);
1041 * Try to destroy a session within a connection.
1043 static void destroy_session(struct relay_session
*session
,
1044 struct lttng_ht
*sessions_ht
)
1047 assert(sessions_ht
);
1049 /* Indicate that this session can be destroyed from now on. */
1050 session
->close_flag
= 1;
1052 try_close_streams(session
);
1055 * This will try to delete and destroy the session if no viewer is attached
1056 * to it meaning the refcount is down to zero.
1058 session_try_destroy(sessions_ht
, session
);
1062 * Copy index data from the control port to a given index object.
1064 static void copy_index_control_data(struct relay_index
*index
,
1065 struct lttcomm_relayd_index
*data
)
1071 * The index on disk is encoded in big endian, so we don't need to convert
1072 * the data received on the network. The data_offset value is NEVER
1073 * modified here and is updated by the data thread.
1075 index
->index_data
.packet_size
= data
->packet_size
;
1076 index
->index_data
.content_size
= data
->content_size
;
1077 index
->index_data
.timestamp_begin
= data
->timestamp_begin
;
1078 index
->index_data
.timestamp_end
= data
->timestamp_end
;
1079 index
->index_data
.events_discarded
= data
->events_discarded
;
1080 index
->index_data
.stream_id
= data
->stream_id
;
1084 * Handle the RELAYD_CREATE_SESSION command.
1086 * On success, send back the session id or else return a negative value.
1089 int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
1090 struct relay_connection
*conn
)
1092 int ret
= 0, send_ret
;
1093 struct relay_session
*session
;
1094 struct lttcomm_relayd_status_session reply
;
1099 memset(&reply
, 0, sizeof(reply
));
1101 session
= session_create();
1106 session
->minor
= conn
->minor
;
1107 session
->major
= conn
->major
;
1108 conn
->session_id
= session
->id
;
1109 conn
->session
= session
;
1111 reply
.session_id
= htobe64(session
->id
);
1113 switch (conn
->minor
) {
1118 case 4: /* LTTng sessiond 2.4 */
1120 ret
= cmd_create_session_2_4(conn
, session
);
1123 lttng_ht_add_unique_u64(conn
->sessions_ht
, &session
->session_n
);
1124 DBG("Created session %" PRIu64
, session
->id
);
1128 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1130 reply
.ret_code
= htobe32(LTTNG_OK
);
1133 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1135 ERR("Relayd sending session id");
1143 * When we have received all the streams and the metadata for a channel,
1144 * we make them visible to the viewer threads.
1147 void set_viewer_ready_flag(struct relay_connection
*conn
)
1149 struct relay_stream
*stream
, *tmp_stream
;
1151 pthread_mutex_lock(&conn
->session
->viewer_ready_lock
);
1152 cds_list_for_each_entry_safe(stream
, tmp_stream
, &conn
->recv_head
,
1154 stream
->viewer_ready
= 1;
1155 cds_list_del(&stream
->recv_list
);
1157 pthread_mutex_unlock(&conn
->session
->viewer_ready_lock
);
1162 * Add a recv handle node to the connection recv list with the given stream
1163 * handle. A new node is allocated thus must be freed when the node is deleted
1166 static void queue_stream(struct relay_stream
*stream
,
1167 struct relay_connection
*conn
)
1172 cds_list_add(&stream
->recv_list
, &conn
->recv_head
);
1176 * relay_add_stream: allocate a new stream for a session
1179 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1180 struct relay_connection
*conn
)
1183 struct relay_session
*session
= conn
->session
;
1184 struct relay_stream
*stream
= NULL
;
1185 struct lttcomm_relayd_status_stream reply
;
1186 struct ctf_trace
*trace
;
1188 if (!session
|| conn
->version_check_done
== 0) {
1189 ERR("Trying to add a stream before version check");
1191 goto end_no_session
;
1194 stream
= zmalloc(sizeof(struct relay_stream
));
1195 if (stream
== NULL
) {
1196 PERROR("relay stream zmalloc");
1198 goto end_no_session
;
1201 switch (conn
->minor
) {
1202 case 1: /* LTTng sessiond 2.1 */
1203 ret
= cmd_recv_stream_2_1(conn
, stream
);
1205 case 2: /* LTTng sessiond 2.2 */
1207 ret
= cmd_recv_stream_2_2(conn
, stream
);
1211 goto err_free_stream
;
1215 stream
->stream_handle
= ++last_relay_stream_id
;
1216 stream
->prev_seq
= -1ULL;
1217 stream
->session_id
= session
->id
;
1218 stream
->index_fd
= -1;
1219 stream
->read_index_fd
= -1;
1220 stream
->ctf_stream_id
= -1ULL;
1221 lttng_ht_node_init_u64(&stream
->node
, stream
->stream_handle
);
1222 pthread_mutex_init(&stream
->lock
, NULL
);
1224 ret
= utils_mkdir_recursive(stream
->path_name
, S_IRWXU
| S_IRWXG
);
1226 ERR("relay creating output directory");
1231 * No need to use run_as API here because whatever we receives, the relayd
1232 * uses its own credentials for the stream files.
1234 ret
= utils_create_stream_file(stream
->path_name
, stream
->channel_name
,
1235 stream
->tracefile_size
, 0, relayd_uid
, relayd_gid
, NULL
);
1237 ERR("Create output file");
1241 if (stream
->tracefile_size
) {
1242 DBG("Tracefile %s/%s_0 created", stream
->path_name
, stream
->channel_name
);
1244 DBG("Tracefile %s/%s created", stream
->path_name
, stream
->channel_name
);
1247 trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
, stream
->path_name
);
1249 trace
= ctf_trace_create(stream
->path_name
);
1254 ctf_trace_add(session
->ctf_traces_ht
, trace
);
1256 ctf_trace_get_ref(trace
);
1258 if (!strncmp(stream
->channel_name
, DEFAULT_METADATA_NAME
, NAME_MAX
)) {
1259 stream
->metadata_flag
= 1;
1260 /* Assign quick reference to the metadata stream in the trace. */
1261 trace
->metadata_stream
= stream
;
1265 * Add the stream in the recv list of the connection. Once the end stream
1266 * message is received, this list is emptied and streams are set with the
1267 * viewer ready flag.
1269 queue_stream(stream
, conn
);
1272 * Both in the ctf_trace object and the global stream ht since the data
1273 * side of the relayd does not have the concept of session.
1275 lttng_ht_add_unique_u64(relay_streams_ht
, &stream
->node
);
1276 cds_list_add_tail(&stream
->trace_list
, &trace
->stream_list
);
1278 session
->stream_count
++;
1280 DBG("Relay new stream added %s with ID %" PRIu64
, stream
->channel_name
,
1281 stream
->stream_handle
);
1284 memset(&reply
, 0, sizeof(reply
));
1285 reply
.handle
= htobe64(stream
->stream_handle
);
1286 /* send the session id to the client or a negative return code on error */
1288 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1289 /* stream was not properly added to the ht, so free it */
1292 reply
.ret_code
= htobe32(LTTNG_OK
);
1295 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1296 sizeof(struct lttcomm_relayd_status_stream
), 0);
1298 ERR("Relay sending stream id");
1307 free(stream
->path_name
);
1308 free(stream
->channel_name
);
1314 * relay_close_stream: close a specific stream
1317 int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1318 struct relay_connection
*conn
)
1321 struct relay_session
*session
= conn
->session
;
1322 struct lttcomm_relayd_close_stream stream_info
;
1323 struct lttcomm_relayd_generic_reply reply
;
1324 struct relay_stream
*stream
;
1326 DBG("Close stream received");
1328 if (!session
|| conn
->version_check_done
== 0) {
1329 ERR("Trying to close a stream before version check");
1331 goto end_no_session
;
1334 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &stream_info
,
1335 sizeof(struct lttcomm_relayd_close_stream
), 0);
1336 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1338 /* Orderly shutdown. Not necessary to print an error. */
1339 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1341 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1344 goto end_no_session
;
1348 stream
= stream_find_by_id(relay_streams_ht
,
1349 be64toh(stream_info
.stream_id
));
1355 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1356 stream
->close_flag
= 1;
1357 session
->stream_count
--;
1359 /* Check if we can close it or else the data will do it. */
1360 try_close_stream(session
, stream
);
1365 memset(&reply
, 0, sizeof(reply
));
1367 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1369 reply
.ret_code
= htobe32(LTTNG_OK
);
1371 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1372 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1374 ERR("Relay sending stream id");
1383 * relay_unknown_command: send -1 if received unknown command
1386 void relay_unknown_command(struct relay_connection
*conn
)
1388 struct lttcomm_relayd_generic_reply reply
;
1391 memset(&reply
, 0, sizeof(reply
));
1392 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1393 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1394 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1396 ERR("Relay sending unknown command");
1401 * relay_start: send an acknowledgment to the client to tell if we are
1402 * ready to receive data. We are ready if a session is established.
1405 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1406 struct relay_connection
*conn
)
1408 int ret
= htobe32(LTTNG_OK
);
1409 struct lttcomm_relayd_generic_reply reply
;
1410 struct relay_session
*session
= conn
->session
;
1413 DBG("Trying to start the streaming without a session established");
1414 ret
= htobe32(LTTNG_ERR_UNK
);
1417 memset(&reply
, 0, sizeof(reply
));
1418 reply
.ret_code
= ret
;
1419 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1420 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1422 ERR("Relay sending start ack");
1429 * Append padding to the file pointed by the file descriptor fd.
1431 static int write_padding_to_file(int fd
, uint32_t size
)
1440 zeros
= zmalloc(size
);
1441 if (zeros
== NULL
) {
1442 PERROR("zmalloc zeros for padding");
1447 ret
= lttng_write(fd
, zeros
, size
);
1449 PERROR("write padding to file");
1459 * relay_recv_metadata: receive the metada for the session.
1462 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1463 struct relay_connection
*conn
)
1465 int ret
= htobe32(LTTNG_OK
);
1467 struct relay_session
*session
= conn
->session
;
1468 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1469 struct relay_stream
*metadata_stream
;
1470 uint64_t data_size
, payload_size
;
1471 struct ctf_trace
*ctf_trace
;
1474 ERR("Metadata sent before version check");
1479 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1480 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1481 ERR("Incorrect data size");
1485 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1487 if (data_buffer_size
< data_size
) {
1488 /* In case the realloc fails, we can free the memory */
1491 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1492 if (!tmp_data_ptr
) {
1493 ERR("Allocating data buffer");
1498 data_buffer
= tmp_data_ptr
;
1499 data_buffer_size
= data_size
;
1501 memset(data_buffer
, 0, data_size
);
1502 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1503 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, data_size
, 0);
1504 if (ret
< 0 || ret
!= data_size
) {
1506 /* Orderly shutdown. Not necessary to print an error. */
1507 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1509 ERR("Relay didn't receive the whole metadata");
1514 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1517 metadata_stream
= stream_find_by_id(relay_streams_ht
,
1518 be64toh(metadata_struct
->stream_id
));
1519 if (!metadata_stream
) {
1524 size_ret
= lttng_write(metadata_stream
->fd
, metadata_struct
->payload
,
1526 if (size_ret
< payload_size
) {
1527 ERR("Relay error writing metadata on file");
1532 ret
= write_padding_to_file(metadata_stream
->fd
,
1533 be32toh(metadata_struct
->padding_size
));
1538 ctf_trace
= ctf_trace_find_by_path(session
->ctf_traces_ht
,
1539 metadata_stream
->path_name
);
1541 ctf_trace
->metadata_received
+=
1542 payload_size
+ be32toh(metadata_struct
->padding_size
);
1544 DBG2("Relay metadata written");
1553 * relay_send_version: send relayd version number
1556 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1557 struct relay_connection
*conn
)
1560 struct lttcomm_relayd_version reply
, msg
;
1564 conn
->version_check_done
= 1;
1566 /* Get version from the other side. */
1567 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1568 if (ret
< 0 || ret
!= sizeof(msg
)) {
1570 /* Orderly shutdown. Not necessary to print an error. */
1571 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1573 ERR("Relay failed to receive the version values.");
1579 memset(&reply
, 0, sizeof(reply
));
1580 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1581 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1583 /* Major versions must be the same */
1584 if (reply
.major
!= be32toh(msg
.major
)) {
1585 DBG("Incompatible major versions (%u vs %u), deleting session",
1586 reply
.major
, be32toh(msg
.major
));
1587 destroy_session(conn
->session
, conn
->sessions_ht
);
1592 conn
->major
= reply
.major
;
1593 /* We adapt to the lowest compatible version */
1594 if (reply
.minor
<= be32toh(msg
.minor
)) {
1595 conn
->minor
= reply
.minor
;
1597 conn
->minor
= be32toh(msg
.minor
);
1600 reply
.major
= htobe32(reply
.major
);
1601 reply
.minor
= htobe32(reply
.minor
);
1602 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1603 sizeof(struct lttcomm_relayd_version
), 0);
1605 ERR("Relay sending version");
1608 DBG("Version check done using protocol %u.%u", conn
->major
,
1616 * Check for data pending for a given stream id from the session daemon.
1619 int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1620 struct relay_connection
*conn
)
1622 struct relay_session
*session
= conn
->session
;
1623 struct lttcomm_relayd_data_pending msg
;
1624 struct lttcomm_relayd_generic_reply reply
;
1625 struct relay_stream
*stream
;
1627 uint64_t last_net_seq_num
, stream_id
;
1629 DBG("Data pending command received");
1631 if (!session
|| conn
->version_check_done
== 0) {
1632 ERR("Trying to check for data before version check");
1634 goto end_no_session
;
1637 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1638 if (ret
< sizeof(msg
)) {
1640 /* Orderly shutdown. Not necessary to print an error. */
1641 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1643 ERR("Relay didn't receive valid data_pending struct size : %d",
1647 goto end_no_session
;
1650 stream_id
= be64toh(msg
.stream_id
);
1651 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1654 stream
= stream_find_by_id(relay_streams_ht
, stream_id
);
1655 if (stream
== NULL
) {
1660 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1661 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1664 /* Avoid wrapping issue */
1665 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1666 /* Data has in fact been written and is NOT pending */
1669 /* Data still being streamed thus pending */
1673 /* Pending check is now done. */
1674 stream
->data_pending_check_done
= 1;
1679 memset(&reply
, 0, sizeof(reply
));
1680 reply
.ret_code
= htobe32(ret
);
1681 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1683 ERR("Relay data pending ret code failed");
1691 * Wait for the control socket to reach a quiescent state.
1693 * Note that for now, when receiving this command from the session daemon, this
1694 * means that every subsequent commands or data received on the control socket
1695 * has been handled. So, this is why we simply return OK here.
1698 int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1699 struct relay_connection
*conn
)
1703 struct relay_stream
*stream
;
1704 struct lttng_ht_iter iter
;
1705 struct lttcomm_relayd_quiescent_control msg
;
1706 struct lttcomm_relayd_generic_reply reply
;
1708 DBG("Checking quiescent state on control socket");
1710 if (!conn
->session
|| conn
->version_check_done
== 0) {
1711 ERR("Trying to check for data before version check");
1713 goto end_no_session
;
1716 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1717 if (ret
< sizeof(msg
)) {
1719 /* Orderly shutdown. Not necessary to print an error. */
1720 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1722 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1726 goto end_no_session
;
1729 stream_id
= be64toh(msg
.stream_id
);
1732 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1734 if (stream
->stream_handle
== stream_id
) {
1735 stream
->data_pending_check_done
= 1;
1736 DBG("Relay quiescent control pending flag set to %" PRIu64
,
1743 memset(&reply
, 0, sizeof(reply
));
1744 reply
.ret_code
= htobe32(LTTNG_OK
);
1745 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1747 ERR("Relay data quiescent control ret code failed");
1755 * Initialize a data pending command. This means that a client is about to ask
1756 * for data pending for each stream he/she holds. Simply iterate over all
1757 * streams of a session and set the data_pending_check_done flag.
1759 * This command returns to the client a LTTNG_OK code.
1762 int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1763 struct relay_connection
*conn
)
1766 struct lttng_ht_iter iter
;
1767 struct lttcomm_relayd_begin_data_pending msg
;
1768 struct lttcomm_relayd_generic_reply reply
;
1769 struct relay_stream
*stream
;
1770 uint64_t session_id
;
1775 DBG("Init streams for data pending");
1777 if (!conn
->session
|| conn
->version_check_done
== 0) {
1778 ERR("Trying to check for data before version check");
1780 goto end_no_session
;
1783 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1784 if (ret
< sizeof(msg
)) {
1786 /* Orderly shutdown. Not necessary to print an error. */
1787 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1789 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1793 goto end_no_session
;
1796 session_id
= be64toh(msg
.session_id
);
1799 * Iterate over all streams to set the begin data pending flag. For now, the
1800 * streams are indexed by stream handle so we have to iterate over all
1801 * streams to find the one associated with the right session_id.
1804 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1806 if (stream
->session_id
== session_id
) {
1807 stream
->data_pending_check_done
= 0;
1808 DBG("Set begin data pending flag to stream %" PRIu64
,
1809 stream
->stream_handle
);
1814 memset(&reply
, 0, sizeof(reply
));
1815 /* All good, send back reply. */
1816 reply
.ret_code
= htobe32(LTTNG_OK
);
1818 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1820 ERR("Relay begin data pending send reply failed");
1828 * End data pending command. This will check, for a given session id, if each
1829 * stream associated with it has its data_pending_check_done flag set. If not,
1830 * this means that the client lost track of the stream but the data is still
1831 * being streamed on our side. In this case, we inform the client that data is
1834 * Return to the client if there is data in flight or not with a ret_code.
1837 int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1838 struct relay_connection
*conn
)
1841 struct lttng_ht_iter iter
;
1842 struct lttcomm_relayd_end_data_pending msg
;
1843 struct lttcomm_relayd_generic_reply reply
;
1844 struct relay_stream
*stream
;
1845 uint64_t session_id
;
1846 uint32_t is_data_inflight
= 0;
1851 DBG("End data pending command");
1853 if (!conn
->session
|| conn
->version_check_done
== 0) {
1854 ERR("Trying to check for data before version check");
1856 goto end_no_session
;
1859 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1860 if (ret
< sizeof(msg
)) {
1862 /* Orderly shutdown. Not necessary to print an error. */
1863 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1865 ERR("Relay didn't receive valid end data_pending struct size: %d",
1869 goto end_no_session
;
1872 session_id
= be64toh(msg
.session_id
);
1874 /* Iterate over all streams to see if the begin data pending flag is set. */
1876 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1878 if (stream
->session_id
== session_id
&&
1879 !stream
->data_pending_check_done
&& !stream
->terminated_flag
) {
1880 is_data_inflight
= 1;
1881 DBG("Data is still in flight for stream %" PRIu64
,
1882 stream
->stream_handle
);
1888 memset(&reply
, 0, sizeof(reply
));
1889 /* All good, send back reply. */
1890 reply
.ret_code
= htobe32(is_data_inflight
);
1892 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1894 ERR("Relay end data pending send reply failed");
1902 * Receive an index for a specific stream.
1904 * Return 0 on success else a negative value.
1907 int relay_recv_index(struct lttcomm_relayd_hdr
*recv_hdr
,
1908 struct relay_connection
*conn
)
1910 int ret
, send_ret
, index_created
= 0;
1911 struct relay_session
*session
= conn
->session
;
1912 struct lttcomm_relayd_index index_info
;
1913 struct relay_index
*index
, *wr_index
= NULL
;
1914 struct lttcomm_relayd_generic_reply reply
;
1915 struct relay_stream
*stream
;
1916 uint64_t net_seq_num
;
1920 DBG("Relay receiving index");
1922 if (!session
|| conn
->version_check_done
== 0) {
1923 ERR("Trying to close a stream before version check");
1925 goto end_no_session
;
1928 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &index_info
,
1929 sizeof(index_info
), 0);
1930 if (ret
< sizeof(index_info
)) {
1932 /* Orderly shutdown. Not necessary to print an error. */
1933 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1935 ERR("Relay didn't receive valid index struct size : %d", ret
);
1938 goto end_no_session
;
1941 net_seq_num
= be64toh(index_info
.net_seq_num
);
1944 stream
= stream_find_by_id(relay_streams_ht
,
1945 be64toh(index_info
.relay_stream_id
));
1948 goto end_rcu_unlock
;
1951 /* Live beacon handling */
1952 if (index_info
.packet_size
== 0) {
1953 DBG("Received live beacon for stream %" PRIu64
, stream
->stream_handle
);
1956 * Only flag a stream inactive when it has already received data
1957 * and no indexes are in flight.
1959 if (stream
->total_index_received
> 0 && stream
->indexes_in_flight
== 0) {
1960 stream
->beacon_ts_end
= be64toh(index_info
.timestamp_end
);
1963 goto end_rcu_unlock
;
1965 stream
->beacon_ts_end
= -1ULL;
1968 index
= relay_index_find(stream
->stream_handle
, net_seq_num
);
1970 /* A successful creation will add the object to the HT. */
1971 index
= relay_index_create(stream
->stream_handle
, net_seq_num
);
1973 goto end_rcu_unlock
;
1976 stream
->indexes_in_flight
++;
1979 copy_index_control_data(index
, &index_info
);
1980 if (stream
->ctf_stream_id
== -1ULL) {
1981 stream
->ctf_stream_id
= be64toh(index_info
.stream_id
);
1984 if (index_created
) {
1986 * Try to add the relay index object to the hash table. If an object
1987 * already exist, destroy back the index created, set the data in this
1988 * object and write it on disk.
1990 relay_index_add(index
, &wr_index
);
1992 copy_index_control_data(wr_index
, &index_info
);
1996 /* The index already exists so write it on disk. */
2000 /* Do we have a writable ready index to write on disk. */
2002 ret
= relay_index_write(wr_index
->fd
, wr_index
);
2004 goto end_rcu_unlock
;
2006 stream
->total_index_received
++;
2007 stream
->indexes_in_flight
--;
2008 assert(stream
->indexes_in_flight
>= 0);
2014 memset(&reply
, 0, sizeof(reply
));
2016 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2018 reply
.ret_code
= htobe32(LTTNG_OK
);
2020 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2022 ERR("Relay sending close index id reply");
2031 * Receive the streams_sent message.
2033 * Return 0 on success else a negative value.
2036 int relay_streams_sent(struct lttcomm_relayd_hdr
*recv_hdr
,
2037 struct relay_connection
*conn
)
2040 struct lttcomm_relayd_generic_reply reply
;
2044 DBG("Relay receiving streams_sent");
2046 if (!conn
->session
|| conn
->version_check_done
== 0) {
2047 ERR("Trying to close a stream before version check");
2049 goto end_no_session
;
2053 * Flag every pending stream in the connection recv list that they are
2054 * ready to be used by the viewer.
2056 set_viewer_ready_flag(conn
);
2059 * Inform the viewer that there are new streams in the session.
2061 if (conn
->session
->viewer_refcount
) {
2062 uatomic_set(&conn
->session
->new_streams
, 1);
2065 memset(&reply
, 0, sizeof(reply
));
2066 reply
.ret_code
= htobe32(LTTNG_OK
);
2067 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2069 ERR("Relay sending sent_stream reply");
2081 * Process the commands received on the control socket
2084 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
2085 struct relay_connection
*conn
)
2089 switch (be32toh(recv_hdr
->cmd
)) {
2090 case RELAYD_CREATE_SESSION
:
2091 ret
= relay_create_session(recv_hdr
, conn
);
2093 case RELAYD_ADD_STREAM
:
2094 ret
= relay_add_stream(recv_hdr
, conn
);
2096 case RELAYD_START_DATA
:
2097 ret
= relay_start(recv_hdr
, conn
);
2099 case RELAYD_SEND_METADATA
:
2100 ret
= relay_recv_metadata(recv_hdr
, conn
);
2102 case RELAYD_VERSION
:
2103 ret
= relay_send_version(recv_hdr
, conn
);
2105 case RELAYD_CLOSE_STREAM
:
2106 ret
= relay_close_stream(recv_hdr
, conn
);
2108 case RELAYD_DATA_PENDING
:
2109 ret
= relay_data_pending(recv_hdr
, conn
);
2111 case RELAYD_QUIESCENT_CONTROL
:
2112 ret
= relay_quiescent_control(recv_hdr
, conn
);
2114 case RELAYD_BEGIN_DATA_PENDING
:
2115 ret
= relay_begin_data_pending(recv_hdr
, conn
);
2117 case RELAYD_END_DATA_PENDING
:
2118 ret
= relay_end_data_pending(recv_hdr
, conn
);
2120 case RELAYD_SEND_INDEX
:
2121 ret
= relay_recv_index(recv_hdr
, conn
);
2123 case RELAYD_STREAMS_SENT
:
2124 ret
= relay_streams_sent(recv_hdr
, conn
);
2126 case RELAYD_UPDATE_SYNC_INFO
:
2128 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
2129 relay_unknown_command(conn
);
2139 * Handle index for a data stream.
2141 * RCU read side lock MUST be acquired.
2143 * Return 0 on success else a negative value.
2145 static int handle_index_data(struct relay_stream
*stream
, uint64_t net_seq_num
,
2148 int ret
= 0, index_created
= 0;
2149 uint64_t stream_id
, data_offset
;
2150 struct relay_index
*index
, *wr_index
= NULL
;
2154 stream_id
= stream
->stream_handle
;
2155 /* Get data offset because we are about to update the index. */
2156 data_offset
= htobe64(stream
->tracefile_size_current
);
2159 * Lookup for an existing index for that stream id/sequence number. If on
2160 * exists, the control thread already received the data for it thus we need
2161 * to write it on disk.
2163 index
= relay_index_find(stream_id
, net_seq_num
);
2165 /* A successful creation will add the object to the HT. */
2166 index
= relay_index_create(stream_id
, net_seq_num
);
2172 stream
->indexes_in_flight
++;
2175 if (rotate_index
|| stream
->index_fd
< 0) {
2176 index
->to_close_fd
= stream
->index_fd
;
2177 ret
= index_create_file(stream
->path_name
, stream
->channel_name
,
2178 relayd_uid
, relayd_gid
, stream
->tracefile_size
,
2179 stream
->tracefile_count_current
);
2181 /* This will close the stream's index fd if one. */
2182 relay_index_free_safe(index
);
2185 stream
->index_fd
= ret
;
2187 index
->fd
= stream
->index_fd
;
2188 index
->index_data
.offset
= data_offset
;
2190 if (index_created
) {
2192 * Try to add the relay index object to the hash table. If an object
2193 * already exist, destroy back the index created and set the data.
2195 relay_index_add(index
, &wr_index
);
2197 /* Copy back data from the created index. */
2198 wr_index
->fd
= index
->fd
;
2199 wr_index
->to_close_fd
= index
->to_close_fd
;
2200 wr_index
->index_data
.offset
= data_offset
;
2204 /* The index already exists so write it on disk. */
2208 /* Do we have a writable ready index to write on disk. */
2210 ret
= relay_index_write(wr_index
->fd
, wr_index
);
2214 stream
->total_index_received
++;
2215 stream
->indexes_in_flight
--;
2216 assert(stream
->indexes_in_flight
>= 0);
2224 * relay_process_data: Process the data received on the data socket
2227 int relay_process_data(struct relay_connection
*conn
)
2229 int ret
= 0, rotate_index
= 0;
2231 struct relay_stream
*stream
;
2232 struct lttcomm_relayd_data_hdr data_hdr
;
2234 uint64_t net_seq_num
;
2236 struct relay_session
*session
;
2240 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &data_hdr
,
2241 sizeof(struct lttcomm_relayd_data_hdr
), 0);
2244 /* Orderly shutdown. Not necessary to print an error. */
2245 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2247 ERR("Unable to receive data header on sock %d", conn
->sock
->fd
);
2253 stream_id
= be64toh(data_hdr
.stream_id
);
2256 stream
= stream_find_by_id(relay_streams_ht
, stream_id
);
2259 goto end_rcu_unlock
;
2262 session
= session_find_by_id(conn
->sessions_ht
, stream
->session_id
);
2265 data_size
= be32toh(data_hdr
.data_size
);
2266 if (data_buffer_size
< data_size
) {
2269 tmp_data_ptr
= realloc(data_buffer
, data_size
);
2270 if (!tmp_data_ptr
) {
2271 ERR("Allocating data buffer");
2274 goto end_rcu_unlock
;
2276 data_buffer
= tmp_data_ptr
;
2277 data_buffer_size
= data_size
;
2279 memset(data_buffer
, 0, data_size
);
2281 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
2283 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
2284 data_size
, stream_id
, net_seq_num
);
2285 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, data_size
, 0);
2288 /* Orderly shutdown. Not necessary to print an error. */
2289 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2292 goto end_rcu_unlock
;
2295 /* Check if a rotation is needed. */
2296 if (stream
->tracefile_size
> 0 &&
2297 (stream
->tracefile_size_current
+ data_size
) >
2298 stream
->tracefile_size
) {
2299 struct relay_viewer_stream
*vstream
;
2302 new_id
= (stream
->tracefile_count_current
+ 1) %
2303 stream
->tracefile_count
;
2305 * When we wrap-around back to 0, we start overwriting old
2308 if (!stream
->tracefile_overwrite
&& new_id
== 0) {
2309 stream
->tracefile_overwrite
= 1;
2311 pthread_mutex_lock(&stream
->viewer_stream_rotation_lock
);
2312 if (stream
->tracefile_overwrite
) {
2313 stream
->oldest_tracefile_id
=
2314 (stream
->oldest_tracefile_id
+ 1) %
2315 stream
->tracefile_count
;
2317 vstream
= viewer_stream_find_by_id(stream
->stream_handle
);
2320 * The viewer is reading a file about to be
2321 * overwritten. Close the FDs it is
2322 * currently using and let it handle the fault.
2324 if (vstream
->tracefile_count_current
== new_id
) {
2325 pthread_mutex_lock(&vstream
->overwrite_lock
);
2326 vstream
->abort_flag
= 1;
2327 pthread_mutex_unlock(&vstream
->overwrite_lock
);
2328 DBG("Streaming side setting abort_flag on stream %s_%" PRIu64
"\n",
2329 stream
->channel_name
, new_id
);
2330 } else if (vstream
->tracefile_count_current
==
2331 stream
->tracefile_count_current
) {
2333 * The reader and writer were in the
2334 * same trace file, inform the viewer
2335 * that no new index will ever be added
2338 vstream
->close_write_flag
= 1;
2341 ret
= utils_rotate_stream_file(stream
->path_name
, stream
->channel_name
,
2342 stream
->tracefile_size
, stream
->tracefile_count
,
2343 relayd_uid
, relayd_gid
, stream
->fd
,
2344 &(stream
->tracefile_count_current
), &stream
->fd
);
2345 pthread_mutex_unlock(&stream
->viewer_stream_rotation_lock
);
2347 ERR("Rotating stream output file");
2348 goto end_rcu_unlock
;
2350 /* Reset current size because we just perform a stream rotation. */
2351 stream
->tracefile_size_current
= 0;
2356 * Index are handled in protocol version 2.4 and above. Also, snapshot and
2357 * index are NOT supported.
2359 if (session
->minor
>= 4 && !session
->snapshot
) {
2360 ret
= handle_index_data(stream
, net_seq_num
, rotate_index
);
2362 goto end_rcu_unlock
;
2366 /* Write data to stream output fd. */
2367 size_ret
= lttng_write(stream
->fd
, data_buffer
, data_size
);
2368 if (size_ret
< data_size
) {
2369 ERR("Relay error writing data to file");
2371 goto end_rcu_unlock
;
2374 DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64
,
2375 ret
, stream
->stream_handle
);
2377 ret
= write_padding_to_file(stream
->fd
, be32toh(data_hdr
.padding_size
));
2379 goto end_rcu_unlock
;
2381 stream
->tracefile_size_current
+= data_size
+ be32toh(data_hdr
.padding_size
);
2383 stream
->prev_seq
= net_seq_num
;
2385 try_close_stream(session
, stream
);
2394 void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
2400 (void) lttng_poll_del(events
, pollfd
);
2402 ret
= close(pollfd
);
2404 ERR("Closing pollfd %d", pollfd
);
2408 static void destroy_connection(struct lttng_ht
*relay_connections_ht
,
2409 struct relay_connection
*conn
)
2411 assert(relay_connections_ht
);
2414 connection_delete(relay_connections_ht
, conn
);
2416 /* For the control socket, we try to destroy the session. */
2417 if (conn
->type
== RELAY_CONTROL
&& conn
->session
) {
2418 destroy_session(conn
->session
, conn
->sessions_ht
);
2421 connection_destroy(conn
);
2425 * This thread does the actual work
2428 void *relay_thread_worker(void *data
)
2430 int ret
, err
= -1, last_seen_data_fd
= -1;
2432 struct relay_connection
*conn
;
2433 struct lttng_poll_event events
;
2434 struct lttng_ht
*relay_connections_ht
;
2435 struct lttng_ht_iter iter
;
2436 struct lttcomm_relayd_hdr recv_hdr
;
2437 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
2438 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
2439 struct relay_index
*index
;
2441 DBG("[thread] Relay worker started");
2443 rcu_register_thread();
2445 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
2447 if (testpoint(relayd_thread_worker
)) {
2448 goto error_testpoint
;
2451 health_code_update();
2453 /* table of connections indexed on socket */
2454 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2455 if (!relay_connections_ht
) {
2456 goto relay_connections_ht_error
;
2459 /* Tables of received indexes indexed by index handle and net_seq_num. */
2460 indexes_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_TWO_U64
);
2462 goto indexes_ht_error
;
2465 ret
= create_thread_poll_set(&events
, 2);
2467 goto error_poll_create
;
2470 ret
= lttng_poll_add(&events
, relay_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
2477 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
2479 health_code_update();
2481 /* Infinite blocking call, waiting for transmission */
2482 DBG3("Relayd worker thread polling...");
2483 health_poll_entry();
2484 ret
= lttng_poll_wait(&events
, -1);
2488 * Restart interrupted system call.
2490 if (errno
== EINTR
) {
2499 * Process control. The control connection is prioritised so we don't
2500 * starve it with high throughout put tracing data on the data
2503 for (i
= 0; i
< nb_fd
; i
++) {
2504 /* Fetch once the poll data */
2505 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2506 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2508 health_code_update();
2511 /* No activity for this FD (poll implementation). */
2515 /* Thread quit pipe has been closed. Killing thread. */
2516 ret
= check_thread_quit_pipe(pollfd
, revents
);
2522 /* Inspect the relay conn pipe for new connection */
2523 if (pollfd
== relay_conn_pipe
[0]) {
2524 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2525 ERR("Relay connection pipe error");
2527 } else if (revents
& LPOLLIN
) {
2528 ret
= lttng_read(relay_conn_pipe
[0], &conn
, sizeof(conn
));
2532 conn
->sessions_ht
= sessions_ht
;
2533 connection_init(conn
);
2534 lttng_poll_add(&events
, conn
->sock
->fd
,
2535 LPOLLIN
| LPOLLRDHUP
);
2537 lttng_ht_add_unique_ulong(relay_connections_ht
,
2540 DBG("Connection socket %d added", conn
->sock
->fd
);
2544 conn
= connection_find_by_sock(relay_connections_ht
, pollfd
);
2545 /* If not found, there is a synchronization issue. */
2548 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2549 cleanup_connection_pollfd(&events
, pollfd
);
2550 destroy_connection(relay_connections_ht
, conn
);
2551 if (last_seen_data_fd
== pollfd
) {
2552 last_seen_data_fd
= last_notdel_data_fd
;
2554 } else if (revents
& LPOLLIN
) {
2555 if (conn
->type
== RELAY_CONTROL
) {
2556 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &recv_hdr
,
2557 sizeof(recv_hdr
), 0);
2559 /* Connection closed */
2560 cleanup_connection_pollfd(&events
, pollfd
);
2561 destroy_connection(relay_connections_ht
, conn
);
2562 DBG("Control connection closed with %d", pollfd
);
2564 ret
= relay_process_control(&recv_hdr
, conn
);
2566 /* Clear the session on error. */
2567 cleanup_connection_pollfd(&events
, pollfd
);
2568 destroy_connection(relay_connections_ht
, conn
);
2569 DBG("Connection closed with %d", pollfd
);
2575 * Flag the last seen data fd not deleted. It will be
2576 * used as the last seen fd if any fd gets deleted in
2579 last_notdel_data_fd
= pollfd
;
2582 ERR("Unknown poll events %u for sock %d", revents
, pollfd
);
2589 * The last loop handled a control request, go back to poll to make
2590 * sure we prioritise the control socket.
2596 if (last_seen_data_fd
>= 0) {
2597 for (i
= 0; i
< nb_fd
; i
++) {
2598 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2600 health_code_update();
2602 if (last_seen_data_fd
== pollfd
) {
2609 /* Process data connection. */
2610 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
2611 /* Fetch the poll data. */
2612 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2613 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2615 health_code_update();
2618 /* No activity for this FD (poll implementation). */
2622 /* Skip the command pipe. It's handled in the first loop. */
2623 if (pollfd
== relay_conn_pipe
[0]) {
2628 conn
= connection_find_by_sock(relay_connections_ht
, pollfd
);
2630 /* Skip it. Might be removed before. */
2635 if (revents
& LPOLLIN
) {
2636 if (conn
->type
!= RELAY_DATA
) {
2641 ret
= relay_process_data(conn
);
2642 /* Connection closed */
2644 cleanup_connection_pollfd(&events
, pollfd
);
2645 destroy_connection(relay_connections_ht
, conn
);
2646 DBG("Data connection closed with %d", pollfd
);
2648 * Every goto restart call sets the last seen fd where
2649 * here we don't really care since we gracefully
2650 * continue the loop after the connection is deleted.
2653 /* Keep last seen port. */
2654 last_seen_data_fd
= pollfd
;
2661 last_seen_data_fd
= -1;
2664 /* Normal exit, no error */
2669 lttng_poll_clean(&events
);
2671 /* Cleanup reamaining connection object. */
2673 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, conn
,
2675 health_code_update();
2676 destroy_connection(relay_connections_ht
, conn
);
2681 cds_lfht_for_each_entry(indexes_ht
->ht
, &iter
.iter
, index
,
2683 health_code_update();
2684 relay_index_delete(index
);
2685 relay_index_free_safe(index
);
2688 lttng_ht_destroy(indexes_ht
);
2690 lttng_ht_destroy(relay_connections_ht
);
2691 relay_connections_ht_error
:
2692 /* Close relay conn pipes */
2693 utils_close_pipe(relay_conn_pipe
);
2695 DBG("Thread exited with error");
2697 DBG("Worker thread cleanup complete");
2702 ERR("Health error occurred in %s", __func__
);
2704 health_unregister(health_relayd
);
2705 rcu_unregister_thread();
2711 * Create the relay command pipe to wake thread_manage_apps.
2712 * Closed in cleanup().
2714 static int create_relay_conn_pipe(void)
2718 ret
= utils_create_pipe_cloexec(relay_conn_pipe
);
2726 int main(int argc
, char **argv
)
2730 struct relay_local_data
*relay_ctx
;
2732 /* Parse arguments */
2734 if ((ret
= set_options(argc
, argv
)) < 0) {
2738 if ((ret
= set_signal_handler()) < 0) {
2742 /* Try to create directory if -o, --output is specified. */
2743 if (opt_output_path
) {
2744 if (*opt_output_path
!= '/') {
2745 ERR("Please specify an absolute path for -o, --output PATH");
2749 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
);
2751 ERR("Unable to create %s", opt_output_path
);
2757 if (opt_daemon
|| opt_background
) {
2760 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
2767 * We are in the child. Make sure all other file
2768 * descriptors are closed, in case we are called with
2769 * more opened file descriptors than the standard ones.
2771 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
2776 /* Create thread quit pipe */
2777 if ((ret
= init_thread_quit_pipe()) < 0) {
2781 /* We need those values for the file/dir creation. */
2782 relayd_uid
= getuid();
2783 relayd_gid
= getgid();
2785 /* Check if daemon is UID = 0 */
2786 if (relayd_uid
== 0) {
2787 if (control_uri
->port
< 1024 || data_uri
->port
< 1024 || live_uri
->port
< 1024) {
2788 ERR("Need to be root to use ports < 1024");
2794 /* Setup the thread apps communication pipe. */
2795 if ((ret
= create_relay_conn_pipe()) < 0) {
2799 /* Init relay command queue. */
2800 cds_wfcq_init(&relay_conn_queue
.head
, &relay_conn_queue
.tail
);
2802 /* Set up max poll set size */
2803 lttng_poll_set_max_size();
2805 /* Initialize communication library */
2807 lttcomm_inet_init();
2809 relay_ctx
= zmalloc(sizeof(struct relay_local_data
));
2811 PERROR("relay_ctx");
2815 /* tables of sessions indexed by session ID */
2816 relay_ctx
->sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2817 if (!relay_ctx
->sessions_ht
) {
2818 goto exit_relay_ctx_sessions
;
2821 /* tables of streams indexed by stream ID */
2822 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2823 if (!relay_streams_ht
) {
2824 goto exit_relay_ctx_streams
;
2827 /* tables of streams indexed by stream ID */
2828 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2829 if (!viewer_streams_ht
) {
2830 goto exit_relay_ctx_viewer_streams
;
2833 /* Initialize thread health monitoring */
2834 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
2835 if (!health_relayd
) {
2836 PERROR("health_app_create error");
2837 goto exit_health_app_create
;
2840 ret
= utils_create_pipe(health_quit_pipe
);
2842 goto error_health_pipe
;
2845 /* Create thread to manage the client socket */
2846 ret
= pthread_create(&health_thread
, NULL
,
2847 thread_manage_health
, (void *) NULL
);
2849 PERROR("pthread_create health");
2853 /* Setup the dispatcher thread */
2854 ret
= pthread_create(&dispatcher_thread
, NULL
,
2855 relay_thread_dispatcher
, (void *) NULL
);
2857 PERROR("pthread_create dispatcher");
2858 goto exit_dispatcher
;
2861 /* Setup the worker thread */
2862 ret
= pthread_create(&worker_thread
, NULL
,
2863 relay_thread_worker
, (void *) relay_ctx
);
2865 PERROR("pthread_create worker");
2869 /* Setup the listener thread */
2870 ret
= pthread_create(&listener_thread
, NULL
,
2871 relay_thread_listener
, (void *) NULL
);
2873 PERROR("pthread_create listener");
2877 ret
= live_start_threads(live_uri
, relay_ctx
);
2879 ERR("Starting live viewer threads");
2884 ret
= pthread_join(listener_thread
, &status
);
2886 PERROR("pthread_join");
2887 goto error
; /* join error, exit without cleanup */
2891 ret
= pthread_join(worker_thread
, &status
);
2893 PERROR("pthread_join");
2894 goto error
; /* join error, exit without cleanup */
2898 ret
= pthread_join(dispatcher_thread
, &status
);
2900 PERROR("pthread_join");
2901 goto error
; /* join error, exit without cleanup */
2905 ret
= pthread_join(health_thread
, &status
);
2907 PERROR("pthread_join health thread");
2908 goto error
; /* join error, exit without cleanup */
2912 * Stop live threads only after joining other threads.
2914 live_stop_threads();
2917 utils_close_pipe(health_quit_pipe
);
2920 health_app_destroy(health_relayd
);
2922 exit_health_app_create
:
2923 lttng_ht_destroy(viewer_streams_ht
);
2925 exit_relay_ctx_viewer_streams
:
2926 lttng_ht_destroy(relay_streams_ht
);
2928 exit_relay_ctx_streams
:
2929 lttng_ht_destroy(relay_ctx
->sessions_ht
);
2931 exit_relay_ctx_sessions
: