2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
38 #include <urcu/futex.h>
39 #include <urcu/uatomic.h>
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/compat/getenv.h>
49 #include <common/defaults.h>
50 #include <common/daemonize.h>
51 #include <common/futex.h>
52 #include <common/sessiond-comm/sessiond-comm.h>
53 #include <common/sessiond-comm/inet.h>
54 #include <common/sessiond-comm/relayd.h>
55 #include <common/uri.h>
56 #include <common/utils.h>
57 #include <common/config/session-config.h>
58 #include <urcu/rculist.h>
61 #include "ctf-trace.h"
64 #include "lttng-relayd.h"
66 #include "health-relayd.h"
67 #include "testpoint.h"
68 #include "viewer-stream.h"
71 #include "connection.h"
72 #include "tracefile-array.h"
74 static const char *help_msg
=
75 #ifdef LTTNG_EMBED_HELP
76 #include <lttng-relayd.8.h>
82 /* command line options */
83 char *opt_output_path
;
84 static int opt_daemon
, opt_background
;
87 * We need to wait for listener and live listener threads, as well as
88 * health check thread, before being ready to signal readiness.
90 #define NR_LTTNG_RELAY_READY 3
91 static int lttng_relay_ready
= NR_LTTNG_RELAY_READY
;
93 /* Size of receive buffer. */
94 #define RECV_DATA_BUFFER_SIZE 65536
96 static int recv_child_signal
; /* Set to 1 when a SIGUSR1 signal is received. */
97 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
99 static struct lttng_uri
*control_uri
;
100 static struct lttng_uri
*data_uri
;
101 static struct lttng_uri
*live_uri
;
103 const char *progname
;
105 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
106 static int tracing_group_name_override
;
108 const char * const config_section_name
= "relayd";
111 * Quit pipe for all threads. This permits a single cancellation point
112 * for all threads when receiving an event on the pipe.
114 int thread_quit_pipe
[2] = { -1, -1 };
117 * This pipe is used to inform the worker thread that a command is queued and
118 * ready to be processed.
120 static int relay_conn_pipe
[2] = { -1, -1 };
122 /* Shared between threads */
123 static int dispatch_thread_exit
;
125 static pthread_t listener_thread
;
126 static pthread_t dispatcher_thread
;
127 static pthread_t worker_thread
;
128 static pthread_t health_thread
;
131 * last_relay_stream_id_lock protects last_relay_stream_id increment
132 * atomicity on 32-bit architectures.
134 static pthread_mutex_t last_relay_stream_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
135 static uint64_t last_relay_stream_id
;
138 * Relay command queue.
140 * The relay_thread_listener and relay_thread_dispatcher communicate with this
143 static struct relay_conn_queue relay_conn_queue
;
145 /* buffer allocated at startup, used to store the trace data */
146 static char *data_buffer
;
147 static unsigned int data_buffer_size
;
149 /* Global relay stream hash table. */
150 struct lttng_ht
*relay_streams_ht
;
152 /* Global relay viewer stream hash table. */
153 struct lttng_ht
*viewer_streams_ht
;
155 /* Global relay sessions hash table. */
156 struct lttng_ht
*sessions_ht
;
158 /* Relayd health monitoring */
159 struct health_app
*health_relayd
;
161 static struct option long_options
[] = {
162 { "control-port", 1, 0, 'C', },
163 { "data-port", 1, 0, 'D', },
164 { "live-port", 1, 0, 'L', },
165 { "daemonize", 0, 0, 'd', },
166 { "background", 0, 0, 'b', },
167 { "group", 1, 0, 'g', },
168 { "help", 0, 0, 'h', },
169 { "output", 1, 0, 'o', },
170 { "verbose", 0, 0, 'v', },
171 { "config", 1, 0, 'f' },
172 { "version", 0, 0, 'V' },
176 static const char *config_ignore_options
[] = { "help", "config", "version" };
179 * Take an option from the getopt output and set it in the right variable to be
182 * Return 0 on success else a negative value.
184 static int set_option(int opt
, const char *arg
, const char *optname
)
190 fprintf(stderr
, "option %s", optname
);
192 fprintf(stderr
, " with arg %s\n", arg
);
196 if (lttng_is_setuid_setgid()) {
197 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
198 "-C, --control-port");
200 ret
= uri_parse(arg
, &control_uri
);
202 ERR("Invalid control URI specified");
205 if (control_uri
->port
== 0) {
206 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
211 if (lttng_is_setuid_setgid()) {
212 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
215 ret
= uri_parse(arg
, &data_uri
);
217 ERR("Invalid data URI specified");
220 if (data_uri
->port
== 0) {
221 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
226 if (lttng_is_setuid_setgid()) {
227 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
230 ret
= uri_parse(arg
, &live_uri
);
232 ERR("Invalid live URI specified");
235 if (live_uri
->port
== 0) {
236 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
247 if (lttng_is_setuid_setgid()) {
248 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
251 tracing_group_name
= strdup(arg
);
252 if (tracing_group_name
== NULL
) {
257 tracing_group_name_override
= 1;
261 ret
= utils_show_help(8, "lttng-relayd", help_msg
);
263 ERR("Cannot show --help for `lttng-relayd`");
268 fprintf(stdout
, "%s\n", VERSION
);
271 if (lttng_is_setuid_setgid()) {
272 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
275 ret
= asprintf(&opt_output_path
, "%s", arg
);
278 PERROR("asprintf opt_output_path");
284 /* Verbose level can increase using multiple -v */
286 lttng_opt_verbose
= config_parse_value(arg
);
288 /* Only 3 level of verbosity (-vvv). */
289 if (lttng_opt_verbose
< 3) {
290 lttng_opt_verbose
+= 1;
295 /* Unknown option or other error.
296 * Error is printed by getopt, just return */
309 * config_entry_handler_cb used to handle options read from a config file.
310 * See config_entry_handler_cb comment in common/config/session-config.h for the
311 * return value conventions.
313 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
317 if (!entry
|| !entry
->name
|| !entry
->value
) {
322 /* Check if the option is to be ignored */
323 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
324 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
329 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1; i
++) {
330 /* Ignore if entry name is not fully matched. */
331 if (strcmp(entry
->name
, long_options
[i
].name
)) {
336 * If the option takes no argument on the command line,
337 * we have to check if the value is "true". We support
338 * non-zero numeric values, true, on and yes.
340 if (!long_options
[i
].has_arg
) {
341 ret
= config_parse_value(entry
->value
);
344 WARN("Invalid configuration value \"%s\" for option %s",
345 entry
->value
, entry
->name
);
347 /* False, skip boolean config option. */
352 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
356 WARN("Unrecognized option \"%s\" in daemon configuration file.",
363 static int set_options(int argc
, char **argv
)
365 int c
, ret
= 0, option_index
= 0, retval
= 0;
366 int orig_optopt
= optopt
, orig_optind
= optind
;
367 char *default_address
, *optstring
;
368 const char *config_path
= NULL
;
370 optstring
= utils_generate_optstring(long_options
,
371 sizeof(long_options
) / sizeof(struct option
));
377 /* Check for the --config option */
379 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
380 &option_index
)) != -1) {
384 } else if (c
!= 'f') {
388 if (lttng_is_setuid_setgid()) {
389 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
392 config_path
= utils_expand_path(optarg
);
394 ERR("Failed to resolve path: %s", optarg
);
399 ret
= config_get_section_entries(config_path
, config_section_name
,
400 config_entry_handler
, NULL
);
403 ERR("Invalid configuration option at line %i", ret
);
409 /* Reset getopt's global state */
410 optopt
= orig_optopt
;
411 optind
= orig_optind
;
413 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
418 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
425 /* assign default values */
426 if (control_uri
== NULL
) {
427 ret
= asprintf(&default_address
,
428 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS
":%d",
429 DEFAULT_NETWORK_CONTROL_PORT
);
431 PERROR("asprintf default data address");
436 ret
= uri_parse(default_address
, &control_uri
);
437 free(default_address
);
439 ERR("Invalid control URI specified");
444 if (data_uri
== NULL
) {
445 ret
= asprintf(&default_address
,
446 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS
":%d",
447 DEFAULT_NETWORK_DATA_PORT
);
449 PERROR("asprintf default data address");
454 ret
= uri_parse(default_address
, &data_uri
);
455 free(default_address
);
457 ERR("Invalid data URI specified");
462 if (live_uri
== NULL
) {
463 ret
= asprintf(&default_address
,
464 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS
":%d",
465 DEFAULT_NETWORK_VIEWER_PORT
);
467 PERROR("asprintf default viewer control address");
472 ret
= uri_parse(default_address
, &live_uri
);
473 free(default_address
);
475 ERR("Invalid viewer control URI specified");
486 static void print_global_objects(void)
488 rcu_register_thread();
490 print_viewer_streams();
491 print_relay_streams();
494 rcu_unregister_thread();
500 static void relayd_cleanup(void)
502 print_global_objects();
506 if (viewer_streams_ht
)
507 lttng_ht_destroy(viewer_streams_ht
);
508 if (relay_streams_ht
)
509 lttng_ht_destroy(relay_streams_ht
);
511 lttng_ht_destroy(sessions_ht
);
513 /* free the dynamically allocated opt_output_path */
514 free(opt_output_path
);
516 /* Close thread quit pipes */
517 utils_close_pipe(thread_quit_pipe
);
519 uri_free(control_uri
);
521 /* Live URI is freed in the live thread. */
523 if (tracing_group_name_override
) {
524 free((void *) tracing_group_name
);
529 * Write to writable pipe used to notify a thread.
531 static int notify_thread_pipe(int wpipe
)
535 ret
= lttng_write(wpipe
, "!", 1);
537 PERROR("write poll pipe");
545 static int notify_health_quit_pipe(int *pipe
)
549 ret
= lttng_write(pipe
[1], "4", 1);
551 PERROR("write relay health quit");
560 * Stop all relayd and relayd-live threads.
562 int lttng_relay_stop_threads(void)
566 /* Stopping all threads */
567 DBG("Terminating all threads");
568 if (notify_thread_pipe(thread_quit_pipe
[1])) {
569 ERR("write error on thread quit pipe");
573 if (notify_health_quit_pipe(health_quit_pipe
)) {
574 ERR("write error on health quit pipe");
577 /* Dispatch thread */
578 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
579 futex_nto1_wake(&relay_conn_queue
.futex
);
581 if (relayd_live_stop()) {
582 ERR("Error stopping live threads");
589 * Signal handler for the daemon
591 * Simply stop all worker threads, leaving main() return gracefully after
592 * joining all threads and calling cleanup().
594 static void sighandler(int sig
)
598 DBG("SIGINT caught");
599 if (lttng_relay_stop_threads()) {
600 ERR("Error stopping threads");
604 DBG("SIGTERM caught");
605 if (lttng_relay_stop_threads()) {
606 ERR("Error stopping threads");
610 CMM_STORE_SHARED(recv_child_signal
, 1);
618 * Setup signal handler for :
619 * SIGINT, SIGTERM, SIGPIPE
621 static int set_signal_handler(void)
627 if ((ret
= sigemptyset(&sigset
)) < 0) {
628 PERROR("sigemptyset");
635 sa
.sa_handler
= sighandler
;
636 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
641 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
646 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
651 sa
.sa_handler
= SIG_IGN
;
652 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
657 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
662 void lttng_relay_notify_ready(void)
664 /* Notify the parent of the fork() process that we are ready. */
665 if (opt_daemon
|| opt_background
) {
666 if (uatomic_sub_return(<tng_relay_ready
, 1) == 0) {
667 kill(child_ppid
, SIGUSR1
);
673 * Init thread quit pipe.
675 * Return -1 on error or 0 if all pipes are created.
677 static int init_thread_quit_pipe(void)
681 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
687 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
689 static int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
693 if (events
== NULL
|| size
== 0) {
698 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
704 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
716 * Check if the thread quit pipe was triggered.
718 * Return 1 if it was triggered else 0;
720 static int check_thread_quit_pipe(int fd
, uint32_t events
)
722 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
730 * Create and init socket from uri.
732 static struct lttcomm_sock
*relay_socket_create(struct lttng_uri
*uri
)
735 struct lttcomm_sock
*sock
= NULL
;
737 sock
= lttcomm_alloc_sock_from_uri(uri
);
739 ERR("Allocating socket");
743 ret
= lttcomm_create_sock(sock
);
747 DBG("Listening on sock %d", sock
->fd
);
749 ret
= sock
->ops
->bind(sock
);
754 ret
= sock
->ops
->listen(sock
, -1);
764 lttcomm_destroy_sock(sock
);
770 * This thread manages the listening for new connections on the network
772 static void *relay_thread_listener(void *data
)
774 int i
, ret
, pollfd
, err
= -1;
775 uint32_t revents
, nb_fd
;
776 struct lttng_poll_event events
;
777 struct lttcomm_sock
*control_sock
, *data_sock
;
779 DBG("[thread] Relay listener started");
781 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
783 health_code_update();
785 control_sock
= relay_socket_create(control_uri
);
787 goto error_sock_control
;
790 data_sock
= relay_socket_create(data_uri
);
792 goto error_sock_relay
;
796 * Pass 3 as size here for the thread quit pipe, control and
799 ret
= create_thread_poll_set(&events
, 3);
801 goto error_create_poll
;
804 /* Add the control socket */
805 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
810 /* Add the data socket */
811 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
816 lttng_relay_notify_ready();
818 if (testpoint(relayd_thread_listener
)) {
819 goto error_testpoint
;
823 health_code_update();
825 DBG("Listener accepting connections");
829 ret
= lttng_poll_wait(&events
, -1);
833 * Restart interrupted system call.
835 if (errno
== EINTR
) {
843 DBG("Relay new connection received");
844 for (i
= 0; i
< nb_fd
; i
++) {
845 health_code_update();
847 /* Fetch once the poll data */
848 revents
= LTTNG_POLL_GETEV(&events
, i
);
849 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
853 * No activity for this FD (poll
859 /* Thread quit pipe has been closed. Killing thread. */
860 ret
= check_thread_quit_pipe(pollfd
, revents
);
866 if (revents
& LPOLLIN
) {
868 * A new connection is requested, therefore a
869 * sessiond/consumerd connection is allocated in
870 * this thread, enqueued to a global queue and
871 * dequeued (and freed) in the worker thread.
874 struct relay_connection
*new_conn
;
875 struct lttcomm_sock
*newsock
;
876 enum connection_type type
;
878 if (pollfd
== data_sock
->fd
) {
880 newsock
= data_sock
->ops
->accept(data_sock
);
881 DBG("Relay data connection accepted, socket %d",
884 assert(pollfd
== control_sock
->fd
);
885 type
= RELAY_CONTROL
;
886 newsock
= control_sock
->ops
->accept(control_sock
);
887 DBG("Relay control connection accepted, socket %d",
891 PERROR("accepting sock");
895 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
898 PERROR("setsockopt inet");
899 lttcomm_destroy_sock(newsock
);
902 new_conn
= connection_create(newsock
, type
);
904 lttcomm_destroy_sock(newsock
);
908 /* Enqueue request for the dispatcher thread. */
909 cds_wfcq_enqueue(&relay_conn_queue
.head
, &relay_conn_queue
.tail
,
913 * Wake the dispatch queue futex.
914 * Implicit memory barrier with the
915 * exchange in cds_wfcq_enqueue.
917 futex_nto1_wake(&relay_conn_queue
.futex
);
918 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
919 ERR("socket poll error");
922 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
932 lttng_poll_clean(&events
);
934 if (data_sock
->fd
>= 0) {
935 ret
= data_sock
->ops
->close(data_sock
);
940 lttcomm_destroy_sock(data_sock
);
942 if (control_sock
->fd
>= 0) {
943 ret
= control_sock
->ops
->close(control_sock
);
948 lttcomm_destroy_sock(control_sock
);
952 ERR("Health error occurred in %s", __func__
);
954 health_unregister(health_relayd
);
955 DBG("Relay listener thread cleanup complete");
956 lttng_relay_stop_threads();
961 * This thread manages the dispatching of the requests to worker threads
963 static void *relay_thread_dispatcher(void *data
)
967 struct cds_wfcq_node
*node
;
968 struct relay_connection
*new_conn
= NULL
;
970 DBG("[thread] Relay dispatcher started");
972 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
974 if (testpoint(relayd_thread_dispatcher
)) {
975 goto error_testpoint
;
978 health_code_update();
980 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
981 health_code_update();
983 /* Atomically prepare the queue futex */
984 futex_nto1_prepare(&relay_conn_queue
.futex
);
987 health_code_update();
989 /* Dequeue commands */
990 node
= cds_wfcq_dequeue_blocking(&relay_conn_queue
.head
,
991 &relay_conn_queue
.tail
);
993 DBG("Woken up but nothing in the relay command queue");
994 /* Continue thread execution */
997 new_conn
= caa_container_of(node
, struct relay_connection
, qnode
);
999 DBG("Dispatching request waiting on sock %d", new_conn
->sock
->fd
);
1002 * Inform worker thread of the new request. This
1003 * call is blocking so we can be assured that
1004 * the data will be read at some point in time
1005 * or wait to the end of the world :)
1007 ret
= lttng_write(relay_conn_pipe
[1], &new_conn
, sizeof(new_conn
));
1009 PERROR("write connection pipe");
1010 connection_put(new_conn
);
1013 } while (node
!= NULL
);
1015 /* Futex wait on queue. Blocking call on futex() */
1016 health_poll_entry();
1017 futex_nto1_wait(&relay_conn_queue
.futex
);
1021 /* Normal exit, no error */
1028 ERR("Health error occurred in %s", __func__
);
1030 health_unregister(health_relayd
);
1031 DBG("Dispatch thread dying");
1032 lttng_relay_stop_threads();
1037 * Set index data from the control port to a given index object.
1039 static int set_index_control_data(struct relay_index
*index
,
1040 struct lttcomm_relayd_index
*data
,
1041 struct relay_connection
*conn
)
1043 struct ctf_packet_index index_data
;
1046 * The index on disk is encoded in big endian, so we don't need
1047 * to convert the data received on the network. The data_offset
1048 * value is NEVER modified here and is updated by the data
1051 index_data
.packet_size
= data
->packet_size
;
1052 index_data
.content_size
= data
->content_size
;
1053 index_data
.timestamp_begin
= data
->timestamp_begin
;
1054 index_data
.timestamp_end
= data
->timestamp_end
;
1055 index_data
.events_discarded
= data
->events_discarded
;
1056 index_data
.stream_id
= data
->stream_id
;
1058 if (conn
->minor
>= 8) {
1059 index
->index_data
.stream_instance_id
= data
->stream_instance_id
;
1060 index
->index_data
.packet_seq_num
= data
->packet_seq_num
;
1063 return relay_index_set_data(index
, &index_data
);
1067 * Handle the RELAYD_CREATE_SESSION command.
1069 * On success, send back the session id or else return a negative value.
1071 static int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
1072 struct relay_connection
*conn
)
1074 int ret
= 0, send_ret
;
1075 struct relay_session
*session
;
1076 struct lttcomm_relayd_status_session reply
;
1077 char session_name
[LTTNG_NAME_MAX
];
1078 char hostname
[LTTNG_HOST_NAME_MAX
];
1079 uint32_t live_timer
= 0;
1080 bool snapshot
= false;
1082 memset(session_name
, 0, LTTNG_NAME_MAX
);
1083 memset(hostname
, 0, LTTNG_HOST_NAME_MAX
);
1085 memset(&reply
, 0, sizeof(reply
));
1087 switch (conn
->minor
) {
1092 case 4: /* LTTng sessiond 2.4 */
1094 ret
= cmd_create_session_2_4(conn
, session_name
,
1095 hostname
, &live_timer
, &snapshot
);
1101 session
= session_create(session_name
, hostname
, live_timer
,
1102 snapshot
, conn
->major
, conn
->minor
);
1107 assert(!conn
->session
);
1108 conn
->session
= session
;
1109 DBG("Created session %" PRIu64
, session
->id
);
1111 reply
.session_id
= htobe64(session
->id
);
1115 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1117 reply
.ret_code
= htobe32(LTTNG_OK
);
1120 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1122 ERR("Relayd sending session id");
1130 * When we have received all the streams and the metadata for a channel,
1131 * we make them visible to the viewer threads.
1133 static void publish_connection_local_streams(struct relay_connection
*conn
)
1135 struct relay_stream
*stream
;
1136 struct relay_session
*session
= conn
->session
;
1139 * We publish all streams belonging to a session atomically wrt
1142 pthread_mutex_lock(&session
->lock
);
1144 cds_list_for_each_entry_rcu(stream
, &session
->recv_list
,
1146 stream_publish(stream
);
1151 * Inform the viewer that there are new streams in the session.
1153 if (session
->viewer_attached
) {
1154 uatomic_set(&session
->new_streams
, 1);
1156 pthread_mutex_unlock(&session
->lock
);
1160 * relay_add_stream: allocate a new stream for a session
1162 static int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1163 struct relay_connection
*conn
)
1167 struct relay_session
*session
= conn
->session
;
1168 struct relay_stream
*stream
= NULL
;
1169 struct lttcomm_relayd_status_stream reply
;
1170 struct ctf_trace
*trace
= NULL
;
1171 uint64_t stream_handle
= -1ULL;
1172 char *path_name
= NULL
, *channel_name
= NULL
;
1173 uint64_t tracefile_size
= 0, tracefile_count
= 0;
1175 if (!session
|| conn
->version_check_done
== 0) {
1176 ERR("Trying to add a stream before version check");
1178 goto end_no_session
;
1181 switch (session
->minor
) {
1182 case 1: /* LTTng sessiond 2.1. Allocates path_name and channel_name. */
1183 ret
= cmd_recv_stream_2_1(conn
, &path_name
,
1186 case 2: /* LTTng sessiond 2.2. Allocates path_name and channel_name. */
1188 ret
= cmd_recv_stream_2_2(conn
, &path_name
,
1189 &channel_name
, &tracefile_size
, &tracefile_count
);
1196 trace
= ctf_trace_get_by_path_or_create(session
, path_name
);
1200 /* This stream here has one reference on the trace. */
1202 pthread_mutex_lock(&last_relay_stream_id_lock
);
1203 stream_handle
= ++last_relay_stream_id
;
1204 pthread_mutex_unlock(&last_relay_stream_id_lock
);
1206 /* We pass ownership of path_name and channel_name. */
1207 stream
= stream_create(trace
, stream_handle
, path_name
,
1208 channel_name
, tracefile_size
, tracefile_count
);
1210 channel_name
= NULL
;
1213 * Streams are the owners of their trace. Reference to trace is
1214 * kept within stream_create().
1216 ctf_trace_put(trace
);
1219 memset(&reply
, 0, sizeof(reply
));
1220 reply
.handle
= htobe64(stream_handle
);
1222 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1224 reply
.ret_code
= htobe32(LTTNG_OK
);
1227 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1228 sizeof(struct lttcomm_relayd_status_stream
), 0);
1230 ERR("Relay sending stream id");
1231 ret
= (int) send_ret
;
1241 * relay_close_stream: close a specific stream
1243 static int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1244 struct relay_connection
*conn
)
1247 struct relay_session
*session
= conn
->session
;
1248 struct lttcomm_relayd_close_stream stream_info
;
1249 struct lttcomm_relayd_generic_reply reply
;
1250 struct relay_stream
*stream
;
1252 DBG("Close stream received");
1254 if (!session
|| conn
->version_check_done
== 0) {
1255 ERR("Trying to close a stream before version check");
1257 goto end_no_session
;
1260 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &stream_info
,
1261 sizeof(struct lttcomm_relayd_close_stream
), 0);
1262 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1264 /* Orderly shutdown. Not necessary to print an error. */
1265 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1267 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1270 goto end_no_session
;
1273 stream
= stream_get_by_id(be64toh(stream_info
.stream_id
));
1280 * Set last_net_seq_num before the close flag. Required by data
1283 pthread_mutex_lock(&stream
->lock
);
1284 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1285 pthread_mutex_unlock(&stream
->lock
);
1288 * This is one of the conditions which may trigger a stream close
1289 * with the others being:
1290 * 1) A close command is received for a stream
1291 * 2) The control connection owning the stream is closed
1292 * 3) We have received all of the stream's data _after_ a close
1295 try_stream_close(stream
);
1296 if (stream
->is_metadata
) {
1297 struct relay_viewer_stream
*vstream
;
1299 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
1301 if (vstream
->metadata_sent
== stream
->metadata_received
) {
1303 * Since all the metadata has been sent to the
1304 * viewer and that we have a request to close
1305 * its stream, we can safely teardown the
1306 * corresponding metadata viewer stream.
1308 viewer_stream_put(vstream
);
1310 /* Put local reference. */
1311 viewer_stream_put(vstream
);
1317 memset(&reply
, 0, sizeof(reply
));
1319 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1321 reply
.ret_code
= htobe32(LTTNG_OK
);
1323 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1324 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1326 ERR("Relay sending stream id");
1335 * relay_reset_metadata: reset a metadata stream
1338 int relay_reset_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1339 struct relay_connection
*conn
)
1342 struct relay_session
*session
= conn
->session
;
1343 struct lttcomm_relayd_reset_metadata stream_info
;
1344 struct lttcomm_relayd_generic_reply reply
;
1345 struct relay_stream
*stream
;
1347 DBG("Reset metadata received");
1349 if (!session
|| conn
->version_check_done
== 0) {
1350 ERR("Trying to reset a metadata stream before version check");
1352 goto end_no_session
;
1355 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &stream_info
,
1356 sizeof(struct lttcomm_relayd_reset_metadata
), 0);
1357 if (ret
< sizeof(struct lttcomm_relayd_reset_metadata
)) {
1359 /* Orderly shutdown. Not necessary to print an error. */
1360 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1362 ERR("Relay didn't receive valid reset_metadata struct "
1366 goto end_no_session
;
1368 DBG("Update metadata to version %" PRIu64
, be64toh(stream_info
.version
));
1370 /* Unsupported for live sessions for now. */
1371 if (session
->live_timer
!= 0) {
1376 stream
= stream_get_by_id(be64toh(stream_info
.stream_id
));
1381 pthread_mutex_lock(&stream
->lock
);
1382 if (!stream
->is_metadata
) {
1387 ret
= utils_rotate_stream_file(stream
->path_name
, stream
->channel_name
,
1388 0, 0, -1, -1, stream
->stream_fd
->fd
, NULL
,
1389 &stream
->stream_fd
->fd
);
1391 ERR("Failed to rotate metadata file %s of channel %s",
1392 stream
->path_name
, stream
->channel_name
);
1397 pthread_mutex_unlock(&stream
->lock
);
1401 memset(&reply
, 0, sizeof(reply
));
1403 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1405 reply
.ret_code
= htobe32(LTTNG_OK
);
1407 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1408 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1410 ERR("Relay sending reset metadata reply");
1419 * relay_unknown_command: send -1 if received unknown command
1421 static void relay_unknown_command(struct relay_connection
*conn
)
1423 struct lttcomm_relayd_generic_reply reply
;
1426 memset(&reply
, 0, sizeof(reply
));
1427 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1428 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1429 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1431 ERR("Relay sending unknown command");
1436 * relay_start: send an acknowledgment to the client to tell if we are
1437 * ready to receive data. We are ready if a session is established.
1439 static int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1440 struct relay_connection
*conn
)
1442 int ret
= htobe32(LTTNG_OK
);
1443 struct lttcomm_relayd_generic_reply reply
;
1444 struct relay_session
*session
= conn
->session
;
1447 DBG("Trying to start the streaming without a session established");
1448 ret
= htobe32(LTTNG_ERR_UNK
);
1451 memset(&reply
, 0, sizeof(reply
));
1452 reply
.ret_code
= ret
;
1453 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1454 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1456 ERR("Relay sending start ack");
1463 * Append padding to the file pointed by the file descriptor fd.
1465 static int write_padding_to_file(int fd
, uint32_t size
)
1474 zeros
= zmalloc(size
);
1475 if (zeros
== NULL
) {
1476 PERROR("zmalloc zeros for padding");
1481 ret
= lttng_write(fd
, zeros
, size
);
1483 PERROR("write padding to file");
1493 * relay_recv_metadata: receive the metadata for the session.
1495 static int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1496 struct relay_connection
*conn
)
1500 struct relay_session
*session
= conn
->session
;
1501 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1502 struct relay_stream
*metadata_stream
;
1503 uint64_t data_size
, payload_size
;
1506 ERR("Metadata sent before version check");
1511 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1512 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1513 ERR("Incorrect data size");
1517 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1519 if (data_buffer_size
< data_size
) {
1520 /* In case the realloc fails, we can free the memory */
1523 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1524 if (!tmp_data_ptr
) {
1525 ERR("Allocating data buffer");
1530 data_buffer
= tmp_data_ptr
;
1531 data_buffer_size
= data_size
;
1533 memset(data_buffer
, 0, data_size
);
1534 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1535 size_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, data_size
, 0);
1536 if (size_ret
< 0 || size_ret
!= data_size
) {
1537 if (size_ret
== 0) {
1538 /* Orderly shutdown. Not necessary to print an error. */
1539 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1541 ERR("Relay didn't receive the whole metadata");
1546 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1548 metadata_stream
= stream_get_by_id(be64toh(metadata_struct
->stream_id
));
1549 if (!metadata_stream
) {
1554 pthread_mutex_lock(&metadata_stream
->lock
);
1556 size_ret
= lttng_write(metadata_stream
->stream_fd
->fd
, metadata_struct
->payload
,
1558 if (size_ret
< payload_size
) {
1559 ERR("Relay error writing metadata on file");
1564 size_ret
= write_padding_to_file(metadata_stream
->stream_fd
->fd
,
1565 be32toh(metadata_struct
->padding_size
));
1570 metadata_stream
->metadata_received
+=
1571 payload_size
+ be32toh(metadata_struct
->padding_size
);
1572 DBG2("Relay metadata written. Updated metadata_received %" PRIu64
,
1573 metadata_stream
->metadata_received
);
1576 pthread_mutex_unlock(&metadata_stream
->lock
);
1577 stream_put(metadata_stream
);
1583 * relay_send_version: send relayd version number
1585 static int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1586 struct relay_connection
*conn
)
1589 struct lttcomm_relayd_version reply
, msg
;
1591 conn
->version_check_done
= 1;
1593 /* Get version from the other side. */
1594 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1595 if (ret
< 0 || ret
!= sizeof(msg
)) {
1597 /* Orderly shutdown. Not necessary to print an error. */
1598 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1600 ERR("Relay failed to receive the version values.");
1606 memset(&reply
, 0, sizeof(reply
));
1607 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1608 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1610 /* Major versions must be the same */
1611 if (reply
.major
!= be32toh(msg
.major
)) {
1612 DBG("Incompatible major versions (%u vs %u), deleting session",
1613 reply
.major
, be32toh(msg
.major
));
1614 connection_put(conn
);
1619 conn
->major
= reply
.major
;
1620 /* We adapt to the lowest compatible version */
1621 if (reply
.minor
<= be32toh(msg
.minor
)) {
1622 conn
->minor
= reply
.minor
;
1624 conn
->minor
= be32toh(msg
.minor
);
1627 reply
.major
= htobe32(reply
.major
);
1628 reply
.minor
= htobe32(reply
.minor
);
1629 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1630 sizeof(struct lttcomm_relayd_version
), 0);
1632 ERR("Relay sending version");
1635 DBG("Version check done using protocol %u.%u", conn
->major
,
1643 * Check for data pending for a given stream id from the session daemon.
1645 static int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1646 struct relay_connection
*conn
)
1648 struct relay_session
*session
= conn
->session
;
1649 struct lttcomm_relayd_data_pending msg
;
1650 struct lttcomm_relayd_generic_reply reply
;
1651 struct relay_stream
*stream
;
1653 uint64_t last_net_seq_num
, stream_id
;
1655 DBG("Data pending command received");
1657 if (!session
|| conn
->version_check_done
== 0) {
1658 ERR("Trying to check for data before version check");
1660 goto end_no_session
;
1663 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1664 if (ret
< sizeof(msg
)) {
1666 /* Orderly shutdown. Not necessary to print an error. */
1667 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1669 ERR("Relay didn't receive valid data_pending struct size : %d",
1673 goto end_no_session
;
1676 stream_id
= be64toh(msg
.stream_id
);
1677 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1679 stream
= stream_get_by_id(stream_id
);
1680 if (stream
== NULL
) {
1685 pthread_mutex_lock(&stream
->lock
);
1687 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1688 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1691 /* Avoid wrapping issue */
1692 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1693 /* Data has in fact been written and is NOT pending */
1696 /* Data still being streamed thus pending */
1700 stream
->data_pending_check_done
= true;
1701 pthread_mutex_unlock(&stream
->lock
);
1706 memset(&reply
, 0, sizeof(reply
));
1707 reply
.ret_code
= htobe32(ret
);
1708 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1710 ERR("Relay data pending ret code failed");
1718 * Wait for the control socket to reach a quiescent state.
1720 * Note that for now, when receiving this command from the session
1721 * daemon, this means that every subsequent commands or data received on
1722 * the control socket has been handled. So, this is why we simply return
1725 static int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1726 struct relay_connection
*conn
)
1730 struct relay_stream
*stream
;
1731 struct lttcomm_relayd_quiescent_control msg
;
1732 struct lttcomm_relayd_generic_reply reply
;
1734 DBG("Checking quiescent state on control socket");
1736 if (!conn
->session
|| conn
->version_check_done
== 0) {
1737 ERR("Trying to check for data before version check");
1739 goto end_no_session
;
1742 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1743 if (ret
< sizeof(msg
)) {
1745 /* Orderly shutdown. Not necessary to print an error. */
1746 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1748 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1752 goto end_no_session
;
1755 stream_id
= be64toh(msg
.stream_id
);
1756 stream
= stream_get_by_id(stream_id
);
1760 pthread_mutex_lock(&stream
->lock
);
1761 stream
->data_pending_check_done
= true;
1762 pthread_mutex_unlock(&stream
->lock
);
1763 DBG("Relay quiescent control pending flag set to %" PRIu64
, stream_id
);
1766 memset(&reply
, 0, sizeof(reply
));
1767 reply
.ret_code
= htobe32(LTTNG_OK
);
1768 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1770 ERR("Relay data quiescent control ret code failed");
1778 * Initialize a data pending command. This means that a consumer is about
1779 * to ask for data pending for each stream it holds. Simply iterate over
1780 * all streams of a session and set the data_pending_check_done flag.
1782 * This command returns to the client a LTTNG_OK code.
1784 static int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1785 struct relay_connection
*conn
)
1788 struct lttng_ht_iter iter
;
1789 struct lttcomm_relayd_begin_data_pending msg
;
1790 struct lttcomm_relayd_generic_reply reply
;
1791 struct relay_stream
*stream
;
1792 uint64_t session_id
;
1797 DBG("Init streams for data pending");
1799 if (!conn
->session
|| conn
->version_check_done
== 0) {
1800 ERR("Trying to check for data before version check");
1802 goto end_no_session
;
1805 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1806 if (ret
< sizeof(msg
)) {
1808 /* Orderly shutdown. Not necessary to print an error. */
1809 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1811 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1815 goto end_no_session
;
1818 session_id
= be64toh(msg
.session_id
);
1821 * Iterate over all streams to set the begin data pending flag.
1822 * For now, the streams are indexed by stream handle so we have
1823 * to iterate over all streams to find the one associated with
1824 * the right session_id.
1827 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1829 if (!stream_get(stream
)) {
1832 if (stream
->trace
->session
->id
== session_id
) {
1833 pthread_mutex_lock(&stream
->lock
);
1834 stream
->data_pending_check_done
= false;
1835 pthread_mutex_unlock(&stream
->lock
);
1836 DBG("Set begin data pending flag to stream %" PRIu64
,
1837 stream
->stream_handle
);
1843 memset(&reply
, 0, sizeof(reply
));
1844 /* All good, send back reply. */
1845 reply
.ret_code
= htobe32(LTTNG_OK
);
1847 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1849 ERR("Relay begin data pending send reply failed");
1857 * End data pending command. This will check, for a given session id, if
1858 * each stream associated with it has its data_pending_check_done flag
1859 * set. If not, this means that the client lost track of the stream but
1860 * the data is still being streamed on our side. In this case, we inform
1861 * the client that data is in flight.
1863 * Return to the client if there is data in flight or not with a ret_code.
1865 static int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1866 struct relay_connection
*conn
)
1869 struct lttng_ht_iter iter
;
1870 struct lttcomm_relayd_end_data_pending msg
;
1871 struct lttcomm_relayd_generic_reply reply
;
1872 struct relay_stream
*stream
;
1873 uint64_t session_id
;
1874 uint32_t is_data_inflight
= 0;
1876 DBG("End data pending command");
1878 if (!conn
->session
|| conn
->version_check_done
== 0) {
1879 ERR("Trying to check for data before version check");
1881 goto end_no_session
;
1884 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1885 if (ret
< sizeof(msg
)) {
1887 /* Orderly shutdown. Not necessary to print an error. */
1888 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1890 ERR("Relay didn't receive valid end data_pending struct size: %d",
1894 goto end_no_session
;
1897 session_id
= be64toh(msg
.session_id
);
1900 * Iterate over all streams to see if the begin data pending
1904 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1906 if (!stream_get(stream
)) {
1909 if (stream
->trace
->session
->id
!= session_id
) {
1913 pthread_mutex_lock(&stream
->lock
);
1914 if (!stream
->data_pending_check_done
) {
1915 if (!stream
->closed
|| !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
1916 is_data_inflight
= 1;
1917 DBG("Data is still in flight for stream %" PRIu64
,
1918 stream
->stream_handle
);
1919 pthread_mutex_unlock(&stream
->lock
);
1924 pthread_mutex_unlock(&stream
->lock
);
1929 memset(&reply
, 0, sizeof(reply
));
1930 /* All good, send back reply. */
1931 reply
.ret_code
= htobe32(is_data_inflight
);
1933 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1935 ERR("Relay end data pending send reply failed");
1943 * Receive an index for a specific stream.
1945 * Return 0 on success else a negative value.
1947 static int relay_recv_index(struct lttcomm_relayd_hdr
*recv_hdr
,
1948 struct relay_connection
*conn
)
1951 struct relay_session
*session
= conn
->session
;
1952 struct lttcomm_relayd_index index_info
;
1953 struct relay_index
*index
;
1954 struct lttcomm_relayd_generic_reply reply
;
1955 struct relay_stream
*stream
;
1956 uint64_t net_seq_num
;
1961 DBG("Relay receiving index");
1963 if (!session
|| conn
->version_check_done
== 0) {
1964 ERR("Trying to close a stream before version check");
1966 goto end_no_session
;
1969 msg_len
= lttcomm_relayd_index_len(
1970 lttng_to_index_major(conn
->major
, conn
->minor
),
1971 lttng_to_index_minor(conn
->major
, conn
->minor
));
1972 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &index_info
,
1974 if (ret
< msg_len
) {
1976 /* Orderly shutdown. Not necessary to print an error. */
1977 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1979 ERR("Relay didn't receive valid index struct size : %d", ret
);
1982 goto end_no_session
;
1985 net_seq_num
= be64toh(index_info
.net_seq_num
);
1987 stream
= stream_get_by_id(be64toh(index_info
.relay_stream_id
));
1989 ERR("stream_get_by_id not found");
1993 pthread_mutex_lock(&stream
->lock
);
1995 /* Live beacon handling */
1996 if (index_info
.packet_size
== 0) {
1997 DBG("Received live beacon for stream %" PRIu64
,
1998 stream
->stream_handle
);
2001 * Only flag a stream inactive when it has already
2002 * received data and no indexes are in flight.
2004 if (stream
->index_received_seqcount
> 0
2005 && stream
->indexes_in_flight
== 0) {
2006 stream
->beacon_ts_end
=
2007 be64toh(index_info
.timestamp_end
);
2010 goto end_stream_put
;
2012 stream
->beacon_ts_end
= -1ULL;
2015 if (stream
->ctf_stream_id
== -1ULL) {
2016 stream
->ctf_stream_id
= be64toh(index_info
.stream_id
);
2018 index
= relay_index_get_by_id_or_create(stream
, net_seq_num
);
2021 ERR("relay_index_get_by_id_or_create index NULL");
2022 goto end_stream_put
;
2024 if (set_index_control_data(index
, &index_info
, conn
)) {
2025 ERR("set_index_control_data error");
2026 relay_index_put(index
);
2028 goto end_stream_put
;
2030 ret
= relay_index_try_flush(index
);
2032 tracefile_array_commit_seq(stream
->tfa
);
2033 stream
->index_received_seqcount
++;
2034 } else if (ret
> 0) {
2038 ERR("relay_index_try_flush error %d", ret
);
2039 relay_index_put(index
);
2044 pthread_mutex_unlock(&stream
->lock
);
2049 memset(&reply
, 0, sizeof(reply
));
2051 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2053 reply
.ret_code
= htobe32(LTTNG_OK
);
2055 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2057 ERR("Relay sending close index id reply");
2066 * Receive the streams_sent message.
2068 * Return 0 on success else a negative value.
2070 static int relay_streams_sent(struct lttcomm_relayd_hdr
*recv_hdr
,
2071 struct relay_connection
*conn
)
2074 struct lttcomm_relayd_generic_reply reply
;
2078 DBG("Relay receiving streams_sent");
2080 if (!conn
->session
|| conn
->version_check_done
== 0) {
2081 ERR("Trying to close a stream before version check");
2083 goto end_no_session
;
2087 * Publish every pending stream in the connection recv list which are
2088 * now ready to be used by the viewer.
2090 publish_connection_local_streams(conn
);
2092 memset(&reply
, 0, sizeof(reply
));
2093 reply
.ret_code
= htobe32(LTTNG_OK
);
2094 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2096 ERR("Relay sending sent_stream reply");
2108 * Process the commands received on the control socket
2110 static int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
2111 struct relay_connection
*conn
)
2115 switch (be32toh(recv_hdr
->cmd
)) {
2116 case RELAYD_CREATE_SESSION
:
2117 ret
= relay_create_session(recv_hdr
, conn
);
2119 case RELAYD_ADD_STREAM
:
2120 ret
= relay_add_stream(recv_hdr
, conn
);
2122 case RELAYD_START_DATA
:
2123 ret
= relay_start(recv_hdr
, conn
);
2125 case RELAYD_SEND_METADATA
:
2126 ret
= relay_recv_metadata(recv_hdr
, conn
);
2128 case RELAYD_VERSION
:
2129 ret
= relay_send_version(recv_hdr
, conn
);
2131 case RELAYD_CLOSE_STREAM
:
2132 ret
= relay_close_stream(recv_hdr
, conn
);
2134 case RELAYD_DATA_PENDING
:
2135 ret
= relay_data_pending(recv_hdr
, conn
);
2137 case RELAYD_QUIESCENT_CONTROL
:
2138 ret
= relay_quiescent_control(recv_hdr
, conn
);
2140 case RELAYD_BEGIN_DATA_PENDING
:
2141 ret
= relay_begin_data_pending(recv_hdr
, conn
);
2143 case RELAYD_END_DATA_PENDING
:
2144 ret
= relay_end_data_pending(recv_hdr
, conn
);
2146 case RELAYD_SEND_INDEX
:
2147 ret
= relay_recv_index(recv_hdr
, conn
);
2149 case RELAYD_STREAMS_SENT
:
2150 ret
= relay_streams_sent(recv_hdr
, conn
);
2152 case RELAYD_RESET_METADATA
:
2153 ret
= relay_reset_metadata(recv_hdr
, conn
);
2155 case RELAYD_UPDATE_SYNC_INFO
:
2157 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
2158 relay_unknown_command(conn
);
2168 * Handle index for a data stream.
2170 * Called with the stream lock held.
2172 * Return 0 on success else a negative value.
2174 static int handle_index_data(struct relay_stream
*stream
, uint64_t net_seq_num
,
2178 uint64_t data_offset
;
2179 struct relay_index
*index
;
2181 /* Get data offset because we are about to update the index. */
2182 data_offset
= htobe64(stream
->tracefile_size_current
);
2184 DBG("handle_index_data: stream %" PRIu64
" net_seq_num %" PRIu64
" data offset %" PRIu64
,
2185 stream
->stream_handle
, net_seq_num
, stream
->tracefile_size_current
);
2188 * Lookup for an existing index for that stream id/sequence
2189 * number. If it exists, the control thread has already received the
2190 * data for it, thus we need to write it to disk.
2192 index
= relay_index_get_by_id_or_create(stream
, net_seq_num
);
2198 if (rotate_index
|| !stream
->index_file
) {
2199 uint32_t major
, minor
;
2201 /* Put ref on previous index_file. */
2202 if (stream
->index_file
) {
2203 lttng_index_file_put(stream
->index_file
);
2204 stream
->index_file
= NULL
;
2206 major
= stream
->trace
->session
->major
;
2207 minor
= stream
->trace
->session
->minor
;
2208 stream
->index_file
= lttng_index_file_create(stream
->path_name
,
2209 stream
->channel_name
,
2210 -1, -1, stream
->tracefile_size
,
2211 tracefile_array_get_file_index_head(stream
->tfa
),
2212 lttng_to_index_major(major
, minor
),
2213 lttng_to_index_minor(major
, minor
));
2214 if (!stream
->index_file
) {
2216 /* Put self-ref for this index due to error. */
2217 relay_index_put(index
);
2223 if (relay_index_set_file(index
, stream
->index_file
, data_offset
)) {
2225 /* Put self-ref for this index due to error. */
2226 relay_index_put(index
);
2231 ret
= relay_index_try_flush(index
);
2233 tracefile_array_commit_seq(stream
->tfa
);
2234 stream
->index_received_seqcount
++;
2235 } else if (ret
> 0) {
2239 /* Put self-ref for this index due to error. */
2240 relay_index_put(index
);
2249 * relay_process_data: Process the data received on the data socket
2251 static int relay_process_data(struct relay_connection
*conn
)
2253 int ret
= 0, rotate_index
= 0;
2255 struct relay_stream
*stream
;
2256 struct lttcomm_relayd_data_hdr data_hdr
;
2258 uint64_t net_seq_num
;
2260 struct relay_session
*session
;
2261 bool new_stream
= false, close_requested
= false;
2262 size_t chunk_size
= RECV_DATA_BUFFER_SIZE
;
2263 size_t recv_off
= 0;
2264 char data_buffer
[chunk_size
];
2266 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &data_hdr
,
2267 sizeof(struct lttcomm_relayd_data_hdr
), 0);
2270 /* Orderly shutdown. Not necessary to print an error. */
2271 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2273 ERR("Unable to receive data header on sock %d", conn
->sock
->fd
);
2279 stream_id
= be64toh(data_hdr
.stream_id
);
2280 stream
= stream_get_by_id(stream_id
);
2282 ERR("relay_process_data: Cannot find stream %" PRIu64
, stream_id
);
2286 session
= stream
->trace
->session
;
2287 data_size
= be32toh(data_hdr
.data_size
);
2289 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
2291 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
2292 data_size
, stream_id
, net_seq_num
);
2294 pthread_mutex_lock(&stream
->lock
);
2296 /* Check if a rotation is needed. */
2297 if (stream
->tracefile_size
> 0 &&
2298 (stream
->tracefile_size_current
+ data_size
) >
2299 stream
->tracefile_size
) {
2300 uint64_t old_id
, new_id
;
2302 old_id
= tracefile_array_get_file_index_head(stream
->tfa
);
2303 tracefile_array_file_rotate(stream
->tfa
);
2305 /* new_id is updated by utils_rotate_stream_file. */
2308 ret
= utils_rotate_stream_file(stream
->path_name
,
2309 stream
->channel_name
, stream
->tracefile_size
,
2310 stream
->tracefile_count
, -1,
2311 -1, stream
->stream_fd
->fd
,
2312 &new_id
, &stream
->stream_fd
->fd
);
2314 ERR("Rotating stream output file");
2315 goto end_stream_unlock
;
2318 * Reset current size because we just performed a stream
2321 stream
->tracefile_size_current
= 0;
2326 * Index are handled in protocol version 2.4 and above. Also,
2327 * snapshot and index are NOT supported.
2329 if (session
->minor
>= 4 && !session
->snapshot
) {
2330 ret
= handle_index_data(stream
, net_seq_num
, rotate_index
);
2332 ERR("handle_index_data: fail stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
2333 stream
->stream_handle
, net_seq_num
, ret
);
2334 goto end_stream_unlock
;
2338 for (recv_off
= 0; recv_off
< data_size
; recv_off
+= chunk_size
) {
2339 size_t recv_size
= min(data_size
- recv_off
, chunk_size
);
2341 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, recv_size
, 0);
2344 /* Orderly shutdown. Not necessary to print an error. */
2345 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2347 ERR("Socket %d error %d", conn
->sock
->fd
, ret
);
2350 goto end_stream_unlock
;
2353 /* Write data to stream output fd. */
2354 size_ret
= lttng_write(stream
->stream_fd
->fd
, data_buffer
,
2356 if (size_ret
< recv_size
) {
2357 ERR("Relay error writing data to file");
2359 goto end_stream_unlock
;
2362 DBG2("Relay wrote %zd bytes to tracefile for stream id %" PRIu64
,
2363 size_ret
, stream
->stream_handle
);
2366 ret
= write_padding_to_file(stream
->stream_fd
->fd
,
2367 be32toh(data_hdr
.padding_size
));
2369 ERR("write_padding_to_file: fail stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
2370 stream
->stream_handle
, net_seq_num
, ret
);
2371 goto end_stream_unlock
;
2373 stream
->tracefile_size_current
+=
2374 data_size
+ be32toh(data_hdr
.padding_size
);
2375 if (stream
->prev_seq
== -1ULL) {
2379 stream
->prev_seq
= net_seq_num
;
2382 close_requested
= stream
->close_requested
;
2383 pthread_mutex_unlock(&stream
->lock
);
2384 if (close_requested
) {
2385 try_stream_close(stream
);
2389 pthread_mutex_lock(&session
->lock
);
2390 uatomic_set(&session
->new_streams
, 1);
2391 pthread_mutex_unlock(&session
->lock
);
2398 static void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
2402 (void) lttng_poll_del(events
, pollfd
);
2404 ret
= close(pollfd
);
2406 ERR("Closing pollfd %d", pollfd
);
2410 static void relay_thread_close_connection(struct lttng_poll_event
*events
,
2411 int pollfd
, struct relay_connection
*conn
)
2413 const char *type_str
;
2415 switch (conn
->type
) {
2420 type_str
= "Control";
2422 case RELAY_VIEWER_COMMAND
:
2423 type_str
= "Viewer Command";
2425 case RELAY_VIEWER_NOTIFICATION
:
2426 type_str
= "Viewer Notification";
2429 type_str
= "Unknown";
2431 cleanup_connection_pollfd(events
, pollfd
);
2432 connection_put(conn
);
2433 DBG("%s connection closed with %d", type_str
, pollfd
);
2437 * This thread does the actual work
2439 static void *relay_thread_worker(void *data
)
2441 int ret
, err
= -1, last_seen_data_fd
= -1;
2443 struct lttng_poll_event events
;
2444 struct lttng_ht
*relay_connections_ht
;
2445 struct lttng_ht_iter iter
;
2446 struct lttcomm_relayd_hdr recv_hdr
;
2447 struct relay_connection
*destroy_conn
= NULL
;
2449 DBG("[thread] Relay worker started");
2451 rcu_register_thread();
2453 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
2455 if (testpoint(relayd_thread_worker
)) {
2456 goto error_testpoint
;
2459 health_code_update();
2461 /* table of connections indexed on socket */
2462 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2463 if (!relay_connections_ht
) {
2464 goto relay_connections_ht_error
;
2467 ret
= create_thread_poll_set(&events
, 2);
2469 goto error_poll_create
;
2472 ret
= lttng_poll_add(&events
, relay_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
2479 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
2481 health_code_update();
2483 /* Infinite blocking call, waiting for transmission */
2484 DBG3("Relayd worker thread polling...");
2485 health_poll_entry();
2486 ret
= lttng_poll_wait(&events
, -1);
2490 * Restart interrupted system call.
2492 if (errno
== EINTR
) {
2501 * Process control. The control connection is
2502 * prioritized so we don't starve it with high
2503 * throughput tracing data on the data connection.
2505 for (i
= 0; i
< nb_fd
; i
++) {
2506 /* Fetch once the poll data */
2507 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2508 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2510 health_code_update();
2514 * No activity for this FD (poll
2520 /* Thread quit pipe has been closed. Killing thread. */
2521 ret
= check_thread_quit_pipe(pollfd
, revents
);
2527 /* Inspect the relay conn pipe for new connection */
2528 if (pollfd
== relay_conn_pipe
[0]) {
2529 if (revents
& LPOLLIN
) {
2530 struct relay_connection
*conn
;
2532 ret
= lttng_read(relay_conn_pipe
[0], &conn
, sizeof(conn
));
2536 lttng_poll_add(&events
, conn
->sock
->fd
,
2537 LPOLLIN
| LPOLLRDHUP
);
2538 connection_ht_add(relay_connections_ht
, conn
);
2539 DBG("Connection socket %d added", conn
->sock
->fd
);
2540 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2541 ERR("Relay connection pipe error");
2544 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2548 struct relay_connection
*ctrl_conn
;
2550 ctrl_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
2551 /* If not found, there is a synchronization issue. */
2554 if (ctrl_conn
->type
== RELAY_DATA
) {
2555 if (revents
& LPOLLIN
) {
2557 * Flag the last seen data fd not deleted. It will be
2558 * used as the last seen fd if any fd gets deleted in
2561 last_notdel_data_fd
= pollfd
;
2563 goto put_ctrl_connection
;
2565 assert(ctrl_conn
->type
== RELAY_CONTROL
);
2567 if (revents
& LPOLLIN
) {
2568 ret
= ctrl_conn
->sock
->ops
->recvmsg(ctrl_conn
->sock
,
2569 &recv_hdr
, sizeof(recv_hdr
), 0);
2571 /* Connection closed */
2572 relay_thread_close_connection(&events
, pollfd
,
2575 ret
= relay_process_control(&recv_hdr
, ctrl_conn
);
2577 /* Clear the session on error. */
2578 relay_thread_close_connection(&events
,
2583 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2584 relay_thread_close_connection(&events
,
2586 if (last_seen_data_fd
== pollfd
) {
2587 last_seen_data_fd
= last_notdel_data_fd
;
2590 ERR("Unexpected poll events %u for control sock %d",
2592 connection_put(ctrl_conn
);
2595 put_ctrl_connection
:
2596 connection_put(ctrl_conn
);
2601 * The last loop handled a control request, go back to poll to make
2602 * sure we prioritise the control socket.
2608 if (last_seen_data_fd
>= 0) {
2609 for (i
= 0; i
< nb_fd
; i
++) {
2610 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2612 health_code_update();
2614 if (last_seen_data_fd
== pollfd
) {
2621 /* Process data connection. */
2622 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
2623 /* Fetch the poll data. */
2624 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2625 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2626 struct relay_connection
*data_conn
;
2628 health_code_update();
2631 /* No activity for this FD (poll implementation). */
2635 /* Skip the command pipe. It's handled in the first loop. */
2636 if (pollfd
== relay_conn_pipe
[0]) {
2640 data_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
2642 /* Skip it. Might be removed before. */
2645 if (data_conn
->type
== RELAY_CONTROL
) {
2646 goto put_data_connection
;
2648 assert(data_conn
->type
== RELAY_DATA
);
2650 if (revents
& LPOLLIN
) {
2651 ret
= relay_process_data(data_conn
);
2652 /* Connection closed */
2654 relay_thread_close_connection(&events
, pollfd
,
2657 * Every goto restart call sets the last seen fd where
2658 * here we don't really care since we gracefully
2659 * continue the loop after the connection is deleted.
2662 /* Keep last seen port. */
2663 last_seen_data_fd
= pollfd
;
2664 connection_put(data_conn
);
2667 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2668 relay_thread_close_connection(&events
, pollfd
,
2671 ERR("Unknown poll events %u for data sock %d",
2674 put_data_connection
:
2675 connection_put(data_conn
);
2677 last_seen_data_fd
= -1;
2680 /* Normal exit, no error */
2685 /* Cleanup reamaining connection object. */
2687 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
,
2690 health_code_update();
2692 if (session_abort(destroy_conn
->session
)) {
2697 * No need to grab another ref, because we own
2700 relay_thread_close_connection(&events
, destroy_conn
->sock
->fd
,
2705 lttng_poll_clean(&events
);
2707 lttng_ht_destroy(relay_connections_ht
);
2708 relay_connections_ht_error
:
2709 /* Close relay conn pipes */
2710 utils_close_pipe(relay_conn_pipe
);
2712 DBG("Thread exited with error");
2714 DBG("Worker thread cleanup complete");
2718 ERR("Health error occurred in %s", __func__
);
2720 health_unregister(health_relayd
);
2721 rcu_unregister_thread();
2722 lttng_relay_stop_threads();
2727 * Create the relay command pipe to wake thread_manage_apps.
2728 * Closed in cleanup().
2730 static int create_relay_conn_pipe(void)
2734 ret
= utils_create_pipe_cloexec(relay_conn_pipe
);
2742 int main(int argc
, char **argv
)
2744 int ret
= 0, retval
= 0;
2747 /* Parse arguments */
2749 if (set_options(argc
, argv
)) {
2754 if (set_signal_handler()) {
2759 /* Try to create directory if -o, --output is specified. */
2760 if (opt_output_path
) {
2761 if (*opt_output_path
!= '/') {
2762 ERR("Please specify an absolute path for -o, --output PATH");
2767 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
,
2770 ERR("Unable to create %s", opt_output_path
);
2777 if (opt_daemon
|| opt_background
) {
2780 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
2788 * We are in the child. Make sure all other file
2789 * descriptors are closed, in case we are called with
2790 * more opened file descriptors than the standard ones.
2792 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
2797 /* Initialize thread health monitoring */
2798 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
2799 if (!health_relayd
) {
2800 PERROR("health_app_create error");
2802 goto exit_health_app_create
;
2805 /* Create thread quit pipe */
2806 if (init_thread_quit_pipe()) {
2808 goto exit_init_data
;
2811 /* Setup the thread apps communication pipe. */
2812 if (create_relay_conn_pipe()) {
2814 goto exit_init_data
;
2817 /* Init relay command queue. */
2818 cds_wfcq_init(&relay_conn_queue
.head
, &relay_conn_queue
.tail
);
2820 /* Initialize communication library */
2822 lttcomm_inet_init();
2824 /* tables of sessions indexed by session ID */
2825 sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2828 goto exit_init_data
;
2831 /* tables of streams indexed by stream ID */
2832 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2833 if (!relay_streams_ht
) {
2835 goto exit_init_data
;
2838 /* tables of streams indexed by stream ID */
2839 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2840 if (!viewer_streams_ht
) {
2842 goto exit_init_data
;
2845 ret
= utils_create_pipe(health_quit_pipe
);
2848 goto exit_health_quit_pipe
;
2851 /* Create thread to manage the client socket */
2852 ret
= pthread_create(&health_thread
, default_pthread_attr(),
2853 thread_manage_health
, (void *) NULL
);
2856 PERROR("pthread_create health");
2858 goto exit_health_thread
;
2861 /* Setup the dispatcher thread */
2862 ret
= pthread_create(&dispatcher_thread
, default_pthread_attr(),
2863 relay_thread_dispatcher
, (void *) NULL
);
2866 PERROR("pthread_create dispatcher");
2868 goto exit_dispatcher_thread
;
2871 /* Setup the worker thread */
2872 ret
= pthread_create(&worker_thread
, default_pthread_attr(),
2873 relay_thread_worker
, NULL
);
2876 PERROR("pthread_create worker");
2878 goto exit_worker_thread
;
2881 /* Setup the listener thread */
2882 ret
= pthread_create(&listener_thread
, default_pthread_attr(),
2883 relay_thread_listener
, (void *) NULL
);
2886 PERROR("pthread_create listener");
2888 goto exit_listener_thread
;
2891 ret
= relayd_live_create(live_uri
);
2893 ERR("Starting live viewer threads");
2899 * This is where we start awaiting program completion (e.g. through
2900 * signal that asks threads to teardown).
2903 ret
= relayd_live_join();
2909 ret
= pthread_join(listener_thread
, &status
);
2912 PERROR("pthread_join listener_thread");
2916 exit_listener_thread
:
2917 ret
= pthread_join(worker_thread
, &status
);
2920 PERROR("pthread_join worker_thread");
2925 ret
= pthread_join(dispatcher_thread
, &status
);
2928 PERROR("pthread_join dispatcher_thread");
2931 exit_dispatcher_thread
:
2933 ret
= pthread_join(health_thread
, &status
);
2936 PERROR("pthread_join health_thread");
2941 utils_close_pipe(health_quit_pipe
);
2942 exit_health_quit_pipe
:
2945 health_app_destroy(health_relayd
);
2946 exit_health_app_create
:
2949 * Wait for all pending call_rcu work to complete before tearing
2950 * down data structures. call_rcu worker may be trying to
2951 * perform lookups in those structures.
2956 /* Ensure all prior call_rcu are done. */