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/defaults.h>
48 #include <common/daemonize.h>
49 #include <common/futex.h>
50 #include <common/sessiond-comm/sessiond-comm.h>
51 #include <common/sessiond-comm/inet.h>
52 #include <common/sessiond-comm/relayd.h>
53 #include <common/uri.h>
54 #include <common/utils.h>
55 #include <common/config/config.h>
58 #include "ctf-trace.h"
61 #include "lttng-relayd.h"
63 #include "health-relayd.h"
64 #include "testpoint.h"
66 /* command line options */
67 char *opt_output_path
;
68 static int opt_daemon
, opt_background
;
71 * We need to wait for listener and live listener threads, as well as
72 * health check thread, before being ready to signal readiness.
74 #define NR_LTTNG_RELAY_READY 3
75 static int lttng_relay_ready
= NR_LTTNG_RELAY_READY
;
76 static int recv_child_signal
; /* Set to 1 when a SIGUSR1 signal is received. */
77 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
79 static struct lttng_uri
*control_uri
;
80 static struct lttng_uri
*data_uri
;
81 static struct lttng_uri
*live_uri
;
85 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
86 static int tracing_group_name_override
;
88 const char * const config_section_name
= "relayd";
91 * Quit pipe for all threads. This permits a single cancellation point
92 * for all threads when receiving an event on the pipe.
94 int thread_quit_pipe
[2] = { -1, -1 };
97 * This pipe is used to inform the worker thread that a command is queued and
98 * ready to be processed.
100 static int relay_cmd_pipe
[2] = { -1, -1 };
102 /* Shared between threads */
103 static int dispatch_thread_exit
;
105 static pthread_t listener_thread
;
106 static pthread_t dispatcher_thread
;
107 static pthread_t worker_thread
;
108 static pthread_t health_thread
;
110 static uint64_t last_relay_stream_id
;
111 static uint64_t last_relay_session_id
;
114 * Relay command queue.
116 * The relay_thread_listener and relay_thread_dispatcher communicate with this
119 static struct relay_cmd_queue relay_cmd_queue
;
121 /* buffer allocated at startup, used to store the trace data */
122 static char *data_buffer
;
123 static unsigned int data_buffer_size
;
125 /* We need those values for the file/dir creation. */
126 static uid_t relayd_uid
;
127 static gid_t relayd_gid
;
129 /* Global relay stream hash table. */
130 struct lttng_ht
*relay_streams_ht
;
132 /* Global relay viewer stream hash table. */
133 struct lttng_ht
*viewer_streams_ht
;
135 /* Global hash table that stores relay index object. */
136 struct lttng_ht
*indexes_ht
;
138 /* Relayd health monitoring */
139 struct health_app
*health_relayd
;
141 static struct option long_options
[] = {
142 { "control-port", 1, 0, 'C', },
143 { "data-port", 1, 0, 'D', },
144 { "live-port", 1, 0, 'L', },
145 { "daemonize", 0, 0, 'd', },
146 { "background", 0, 0, 'b', },
147 { "group", 1, 0, 'g', },
148 { "help", 0, 0, 'h', },
149 { "output", 1, 0, 'o', },
150 { "verbose", 0, 0, 'v', },
151 { "config", 1, 0, 'f' },
155 static const char *config_ignore_options
[] = { "help", "config" };
158 * usage function on stderr
163 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
164 fprintf(stderr
, " -h, --help Display this usage.\n");
165 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
166 fprintf(stderr
, " -b, --background Start as a daemon, keeping console open.\n");
167 fprintf(stderr
, " -C, --control-port URL Control port listening.\n");
168 fprintf(stderr
, " -D, --data-port URL Data port listening.\n");
169 fprintf(stderr
, " -L, --live-port URL Live view port listening.\n");
170 fprintf(stderr
, " -o, --output PATH Output path for traces. Must use an absolute path.\n");
171 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
172 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
173 fprintf(stderr
, " -f --config Load daemon configuration file\n");
177 * Take an option from the getopt output and set it in the right variable to be
180 * Return 0 on success else a negative value.
183 int set_option(int opt
, const char *arg
, const char *optname
)
189 fprintf(stderr
, "option %s", optname
);
191 fprintf(stderr
, " with arg %s\n", arg
);
195 ret
= uri_parse(arg
, &control_uri
);
197 ERR("Invalid control URI specified");
200 if (control_uri
->port
== 0) {
201 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
205 ret
= uri_parse(arg
, &data_uri
);
207 ERR("Invalid data URI specified");
210 if (data_uri
->port
== 0) {
211 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
215 ret
= uri_parse(arg
, &live_uri
);
217 ERR("Invalid live URI specified");
220 if (live_uri
->port
== 0) {
221 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
231 tracing_group_name
= strdup(arg
);
232 tracing_group_name_override
= 1;
238 ret
= asprintf(&opt_output_path
, "%s", arg
);
241 PERROR("asprintf opt_output_path");
246 /* Verbose level can increase using multiple -v */
248 lttng_opt_verbose
= config_parse_value(arg
);
250 lttng_opt_verbose
+= 1;
254 /* Unknown option or other error.
255 * Error is printed by getopt, just return */
268 * config_entry_handler_cb used to handle options read from a config file.
269 * See config_entry_handler_cb comment in common/config/config.h for the
270 * return value conventions.
273 int config_entry_handler(const struct config_entry
*entry
, void *unused
)
277 if (!entry
|| !entry
->name
|| !entry
->value
) {
282 /* Check if the option is to be ignored */
283 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
284 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
289 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1; i
++) {
290 /* Ignore if entry name is not fully matched. */
291 if (strcmp(entry
->name
, long_options
[i
].name
)) {
296 * If the option takes no argument on the command line, we have to
297 * check if the value is "true". We support non-zero numeric values,
300 if (!long_options
[i
].has_arg
) {
301 ret
= config_parse_value(entry
->value
);
304 WARN("Invalid configuration value \"%s\" for option %s",
305 entry
->value
, entry
->name
);
307 /* False, skip boolean config option. */
312 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
316 WARN("Unrecognized option \"%s\" in daemon configuration file.",
324 int set_options(int argc
, char **argv
)
326 int c
, ret
= 0, option_index
= 0;
327 int orig_optopt
= optopt
, orig_optind
= optind
;
328 char *default_address
, *optstring
;
329 const char *config_path
= NULL
;
331 optstring
= utils_generate_optstring(long_options
,
332 sizeof(long_options
) / sizeof(struct option
));
338 /* Check for the --config option */
340 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
341 &option_index
)) != -1) {
345 } else if (c
!= 'f') {
349 config_path
= utils_expand_path(optarg
);
351 ERR("Failed to resolve path: %s", optarg
);
355 ret
= config_get_section_entries(config_path
, config_section_name
,
356 config_entry_handler
, NULL
);
359 ERR("Invalid configuration option at line %i", ret
);
365 /* Reset getopt's global state */
366 optopt
= orig_optopt
;
367 optind
= orig_optind
;
369 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
374 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
380 /* assign default values */
381 if (control_uri
== NULL
) {
382 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
383 DEFAULT_NETWORK_CONTROL_PORT
);
385 PERROR("asprintf default data address");
389 ret
= uri_parse(default_address
, &control_uri
);
390 free(default_address
);
392 ERR("Invalid control URI specified");
396 if (data_uri
== NULL
) {
397 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
398 DEFAULT_NETWORK_DATA_PORT
);
400 PERROR("asprintf default data address");
404 ret
= uri_parse(default_address
, &data_uri
);
405 free(default_address
);
407 ERR("Invalid data URI specified");
411 if (live_uri
== NULL
) {
412 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
413 DEFAULT_NETWORK_VIEWER_PORT
);
415 PERROR("asprintf default viewer control address");
419 ret
= uri_parse(default_address
, &live_uri
);
420 free(default_address
);
422 ERR("Invalid viewer control URI specified");
440 /* free the dynamically allocated opt_output_path */
441 free(opt_output_path
);
443 /* Close thread quit pipes */
444 utils_close_pipe(thread_quit_pipe
);
446 uri_free(control_uri
);
448 /* Live URI is freed in the live thread. */
450 if (tracing_group_name_override
) {
451 free((void *) tracing_group_name
);
456 * Write to writable pipe used to notify a thread.
459 int notify_thread_pipe(int wpipe
)
463 ret
= lttng_write(wpipe
, "!", 1);
465 PERROR("write poll pipe");
471 static void notify_health_quit_pipe(int *pipe
)
475 ret
= lttng_write(pipe
[1], "4", 1);
477 PERROR("write relay health quit");
482 * Stop all threads by closing the thread quit pipe.
485 void stop_threads(void)
489 /* Stopping all threads */
490 DBG("Terminating all threads");
491 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
493 ERR("write error on thread quit pipe");
496 notify_health_quit_pipe(health_quit_pipe
);
498 /* Dispatch thread */
499 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
500 futex_nto1_wake(&relay_cmd_queue
.futex
);
504 * Signal handler for the daemon
506 * Simply stop all worker threads, leaving main() return gracefully after
507 * joining all threads and calling cleanup().
510 void sighandler(int sig
)
514 DBG("SIGPIPE caught");
517 DBG("SIGINT caught");
521 DBG("SIGTERM caught");
525 CMM_STORE_SHARED(recv_child_signal
, 1);
533 * Setup signal handler for :
534 * SIGINT, SIGTERM, SIGPIPE
537 int set_signal_handler(void)
543 if ((ret
= sigemptyset(&sigset
)) < 0) {
544 PERROR("sigemptyset");
548 sa
.sa_handler
= sighandler
;
551 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
556 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
561 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
566 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
571 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
576 void lttng_relay_notify_ready(void)
578 /* Notify the parent of the fork() process that we are ready. */
579 if (opt_daemon
|| opt_background
) {
580 if (uatomic_sub_return(<tng_relay_ready
, 1) == 0) {
581 kill(child_ppid
, SIGUSR1
);
587 * Init thread quit pipe.
589 * Return -1 on error or 0 if all pipes are created.
592 int init_thread_quit_pipe(void)
596 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
602 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
605 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
609 if (events
== NULL
|| size
== 0) {
614 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
620 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
632 * Check if the thread quit pipe was triggered.
634 * Return 1 if it was triggered else 0;
637 int check_thread_quit_pipe(int fd
, uint32_t events
)
639 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
647 * Create and init socket from uri.
650 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
653 struct lttcomm_sock
*sock
= NULL
;
655 sock
= lttcomm_alloc_sock_from_uri(uri
);
657 ERR("Allocating socket");
661 ret
= lttcomm_create_sock(sock
);
665 DBG("Listening on sock %d", sock
->fd
);
667 ret
= sock
->ops
->bind(sock
);
672 ret
= sock
->ops
->listen(sock
, -1);
682 lttcomm_destroy_sock(sock
);
688 * Return nonzero if stream needs to be closed.
691 int close_stream_check(struct relay_stream
*stream
)
694 if (stream
->close_flag
&& stream
->prev_seq
== stream
->last_net_seq_num
) {
696 * We are about to close the stream so set the data pending flag to 1
697 * which will make the end data pending command skip the stream which
698 * is now closed and ready. Note that after proceeding to a file close,
699 * the written file is ready for reading.
701 stream
->data_pending_check_done
= 1;
708 * This thread manages the listening for new connections on the network
711 void *relay_thread_listener(void *data
)
713 int i
, ret
, pollfd
, err
= -1;
715 uint32_t revents
, nb_fd
;
716 struct lttng_poll_event events
;
717 struct lttcomm_sock
*control_sock
, *data_sock
;
719 DBG("[thread] Relay listener started");
721 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
723 health_code_update();
725 control_sock
= relay_init_sock(control_uri
);
727 goto error_sock_control
;
730 data_sock
= relay_init_sock(data_uri
);
732 goto error_sock_relay
;
736 * Pass 3 as size here for the thread quit pipe, control and data socket.
738 ret
= create_thread_poll_set(&events
, 3);
740 goto error_create_poll
;
743 /* Add the control socket */
744 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
749 /* Add the data socket */
750 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
755 lttng_relay_notify_ready();
757 if (testpoint(relayd_thread_listener
)) {
758 goto error_testpoint
;
762 health_code_update();
764 DBG("Listener accepting connections");
768 ret
= lttng_poll_wait(&events
, -1);
772 * Restart interrupted system call.
774 if (errno
== EINTR
) {
782 DBG("Relay new connection received");
783 for (i
= 0; i
< nb_fd
; i
++) {
784 health_code_update();
786 /* Fetch once the poll data */
787 revents
= LTTNG_POLL_GETEV(&events
, i
);
788 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
790 /* Thread quit pipe has been closed. Killing thread. */
791 ret
= check_thread_quit_pipe(pollfd
, revents
);
797 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
798 ERR("socket poll error");
800 } else if (revents
& LPOLLIN
) {
802 * Get allocated in this thread,
803 * enqueued to a global queue, dequeued
804 * and freed in the worker thread.
806 struct relay_command
*relay_cmd
;
807 struct lttcomm_sock
*newsock
;
809 relay_cmd
= zmalloc(sizeof(struct relay_command
));
810 if (relay_cmd
== NULL
) {
811 PERROR("relay command zmalloc");
815 if (pollfd
== data_sock
->fd
) {
816 newsock
= data_sock
->ops
->accept(data_sock
);
818 PERROR("accepting data sock");
822 relay_cmd
->type
= RELAY_DATA
;
823 DBG("Relay data connection accepted, socket %d", newsock
->fd
);
825 assert(pollfd
== control_sock
->fd
);
826 newsock
= control_sock
->ops
->accept(control_sock
);
828 PERROR("accepting control sock");
832 relay_cmd
->type
= RELAY_CONTROL
;
833 DBG("Relay control connection accepted, socket %d", newsock
->fd
);
835 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
,
838 PERROR("setsockopt inet");
839 lttcomm_destroy_sock(newsock
);
843 relay_cmd
->sock
= newsock
;
845 * Lock free enqueue the request.
847 cds_wfq_enqueue(&relay_cmd_queue
.queue
, &relay_cmd
->node
);
850 * Wake the dispatch queue futex. Implicit memory
851 * barrier with the exchange in cds_wfq_enqueue.
853 futex_nto1_wake(&relay_cmd_queue
.futex
);
862 lttng_poll_clean(&events
);
864 if (data_sock
->fd
>= 0) {
865 ret
= data_sock
->ops
->close(data_sock
);
870 lttcomm_destroy_sock(data_sock
);
872 if (control_sock
->fd
>= 0) {
873 ret
= control_sock
->ops
->close(control_sock
);
878 lttcomm_destroy_sock(control_sock
);
882 ERR("Health error occurred in %s", __func__
);
884 health_unregister(health_relayd
);
885 DBG("Relay listener thread cleanup complete");
891 * This thread manages the dispatching of the requests to worker threads
894 void *relay_thread_dispatcher(void *data
)
898 struct cds_wfq_node
*node
;
899 struct relay_command
*relay_cmd
= NULL
;
901 DBG("[thread] Relay dispatcher started");
903 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
905 if (testpoint(relayd_thread_dispatcher
)) {
906 goto error_testpoint
;
909 health_code_update();
911 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
912 health_code_update();
914 /* Atomically prepare the queue futex */
915 futex_nto1_prepare(&relay_cmd_queue
.futex
);
918 health_code_update();
920 /* Dequeue commands */
921 node
= cds_wfq_dequeue_blocking(&relay_cmd_queue
.queue
);
923 DBG("Woken up but nothing in the relay command queue");
924 /* Continue thread execution */
928 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
929 DBG("Dispatching request waiting on sock %d", relay_cmd
->sock
->fd
);
932 * Inform worker thread of the new request. This
933 * call is blocking so we can be assured that the data will be read
934 * at some point in time or wait to the end of the world :)
936 ret
= lttng_write(relay_cmd_pipe
[1], relay_cmd
,
937 sizeof(struct relay_command
));
939 if (ret
< sizeof(struct relay_command
)) {
940 PERROR("write cmd pipe");
943 } while (node
!= NULL
);
945 /* Futex wait on queue. Blocking call on futex() */
947 futex_nto1_wait(&relay_cmd_queue
.futex
);
951 /* Normal exit, no error */
958 ERR("Health error occurred in %s", __func__
);
960 health_unregister(health_relayd
);
961 DBG("Dispatch thread dying");
967 * Get stream from stream id.
968 * Need to be called with RCU read-side lock held.
970 struct relay_stream
*relay_stream_find_by_id(uint64_t stream_id
)
972 struct lttng_ht_node_ulong
*node
;
973 struct lttng_ht_iter iter
;
974 struct relay_stream
*ret
;
976 lttng_ht_lookup(relay_streams_ht
,
977 (void *)((unsigned long) stream_id
),
979 node
= lttng_ht_iter_get_node_ulong(&iter
);
981 DBG("Relay stream %" PRIu64
" not found", stream_id
);
986 ret
= caa_container_of(node
, struct relay_stream
, stream_n
);
993 void deferred_free_stream(struct rcu_head
*head
)
995 struct relay_stream
*stream
=
996 caa_container_of(head
, struct relay_stream
, rcu_node
);
998 free(stream
->path_name
);
999 free(stream
->channel_name
);
1004 void deferred_free_session(struct rcu_head
*head
)
1006 struct relay_session
*session
=
1007 caa_container_of(head
, struct relay_session
, rcu_node
);
1012 * Close a given stream. The stream is freed using a call RCU.
1014 * RCU read side lock MUST be acquired. If NO close_stream_check() was called
1015 * BEFORE the stream lock MUST be acquired.
1017 static void destroy_stream(struct relay_stream
*stream
)
1020 struct relay_viewer_stream
*vstream
;
1021 struct lttng_ht_iter iter
;
1025 delret
= close(stream
->fd
);
1027 PERROR("close stream");
1030 if (stream
->index_fd
>= 0) {
1031 delret
= close(stream
->index_fd
);
1033 PERROR("close stream index_fd");
1037 vstream
= live_find_viewer_stream_by_id(stream
->stream_handle
);
1040 * Set the last good value into the viewer stream. This is done
1041 * right before the stream gets deleted from the hash table. The
1042 * lookup failure on the live thread side of a stream indicates
1043 * that the viewer stream index received value should be used.
1045 pthread_mutex_lock(&stream
->viewer_stream_rotation_lock
);
1046 vstream
->total_index_received
= stream
->total_index_received
;
1047 vstream
->tracefile_count_last
= stream
->tracefile_count_current
;
1048 vstream
->close_write_flag
= 1;
1049 pthread_mutex_unlock(&stream
->viewer_stream_rotation_lock
);
1052 /* Cleanup index of that stream. */
1053 relay_index_destroy_by_stream_id(stream
->stream_handle
);
1055 iter
.iter
.node
= &stream
->stream_n
.node
;
1056 delret
= lttng_ht_del(relay_streams_ht
, &iter
);
1058 iter
.iter
.node
= &stream
->ctf_trace_node
.node
;
1059 delret
= lttng_ht_del(stream
->ctf_traces_ht
, &iter
);
1062 if (stream
->ctf_trace
) {
1063 ctf_trace_try_destroy(stream
->ctf_trace
);
1066 call_rcu(&stream
->rcu_node
, deferred_free_stream
);
1067 DBG("Closed tracefile %d from close stream", stream
->fd
);
1071 * relay_delete_session: Free all memory associated with a session and
1075 void relay_delete_session(struct relay_command
*cmd
,
1076 struct lttng_ht
*sessions_ht
)
1078 struct lttng_ht_iter iter
;
1079 struct lttng_ht_node_ulong
*node
;
1080 struct relay_stream
*stream
;
1083 if (!cmd
->session
) {
1087 DBG("Relay deleting session %" PRIu64
, cmd
->session
->id
);
1090 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, node
, node
) {
1091 node
= lttng_ht_iter_get_node_ulong(&iter
);
1095 stream
= caa_container_of(node
, struct relay_stream
, stream_n
);
1096 if (stream
->session
== cmd
->session
) {
1097 destroy_stream(stream
);
1098 cmd
->session
->stream_count
--;
1099 assert(cmd
->session
->stream_count
>= 0);
1103 /* Make this session not visible anymore. */
1104 iter
.iter
.node
= &cmd
->session
->session_n
.node
;
1105 ret
= lttng_ht_del(sessions_ht
, &iter
);
1107 call_rcu(&cmd
->session
->rcu_node
, deferred_free_session
);
1112 * Copy index data from the control port to a given index object.
1114 static void copy_index_control_data(struct relay_index
*index
,
1115 struct lttcomm_relayd_index
*data
)
1121 * The index on disk is encoded in big endian, so we don't need to convert
1122 * the data received on the network. The data_offset value is NEVER
1123 * modified here and is updated by the data thread.
1125 index
->index_data
.packet_size
= data
->packet_size
;
1126 index
->index_data
.content_size
= data
->content_size
;
1127 index
->index_data
.timestamp_begin
= data
->timestamp_begin
;
1128 index
->index_data
.timestamp_end
= data
->timestamp_end
;
1129 index
->index_data
.events_discarded
= data
->events_discarded
;
1130 index
->index_data
.stream_id
= data
->stream_id
;
1134 * Handle the RELAYD_CREATE_SESSION command.
1136 * On success, send back the session id or else return a negative value.
1139 int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
1140 struct relay_command
*cmd
,
1141 struct lttng_ht
*sessions_ht
)
1143 int ret
= 0, send_ret
;
1144 struct relay_session
*session
;
1145 struct lttcomm_relayd_status_session reply
;
1150 memset(&reply
, 0, sizeof(reply
));
1152 session
= zmalloc(sizeof(struct relay_session
));
1153 if (session
== NULL
) {
1154 PERROR("relay session zmalloc");
1159 session
->id
= ++last_relay_session_id
;
1160 session
->sock
= cmd
->sock
;
1161 session
->minor
= cmd
->minor
;
1162 session
->major
= cmd
->major
;
1163 pthread_mutex_init(&session
->viewer_ready_lock
, NULL
);
1164 cmd
->session
= session
;
1166 reply
.session_id
= htobe64(session
->id
);
1168 switch (cmd
->minor
) {
1173 case 4: /* LTTng sessiond 2.4 */
1175 ret
= cmd_create_session_2_4(cmd
, session
);
1179 lttng_ht_node_init_ulong(&session
->session_n
,
1180 (unsigned long) session
->id
);
1181 lttng_ht_add_unique_ulong(sessions_ht
,
1182 &session
->session_n
);
1184 DBG("Created session %" PRIu64
, session
->id
);
1188 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1190 reply
.ret_code
= htobe32(LTTNG_OK
);
1193 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1195 ERR("Relayd sending session id");
1203 * When we have received all the streams and the metadata for a channel,
1204 * we make them visible to the viewer threads.
1207 void set_viewer_ready_flag(struct relay_command
*cmd
)
1209 struct relay_stream_recv_handle
*node
, *tmp_node
;
1211 pthread_mutex_lock(&cmd
->session
->viewer_ready_lock
);
1213 cds_list_for_each_entry_safe(node
, tmp_node
, &cmd
->recv_head
, node
) {
1214 struct relay_stream
*stream
;
1217 stream
= relay_stream_find_by_id(node
->id
);
1220 * Stream is most probably being cleaned up by the data thread thus
1221 * simply continue to the next one.
1227 stream
->viewer_ready
= 1;
1230 /* Clean stream handle node. */
1231 cds_list_del(&node
->node
);
1235 pthread_mutex_unlock(&cmd
->session
->viewer_ready_lock
);
1240 * Add a recv handle node to the connection recv list with the given stream
1241 * handle. A new node is allocated thus must be freed when the node is deleted
1244 static void queue_stream_handle(uint64_t handle
, struct relay_command
*cmd
)
1246 struct relay_stream_recv_handle
*node
;
1250 node
= zmalloc(sizeof(*node
));
1252 PERROR("zmalloc queue stream handle");
1257 cds_list_add(&node
->node
, &cmd
->recv_head
);
1261 * relay_add_stream: allocate a new stream for a session
1264 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1265 struct relay_command
*cmd
, struct lttng_ht
*sessions_ht
)
1267 struct relay_session
*session
= cmd
->session
;
1268 struct relay_stream
*stream
= NULL
;
1269 struct lttcomm_relayd_status_stream reply
;
1272 if (!session
|| cmd
->version_check_done
== 0) {
1273 ERR("Trying to add a stream before version check");
1275 goto end_no_session
;
1278 stream
= zmalloc(sizeof(struct relay_stream
));
1279 if (stream
== NULL
) {
1280 PERROR("relay stream zmalloc");
1282 goto end_no_session
;
1285 switch (cmd
->minor
) {
1286 case 1: /* LTTng sessiond 2.1 */
1287 ret
= cmd_recv_stream_2_1(cmd
, stream
);
1289 case 2: /* LTTng sessiond 2.2 */
1291 ret
= cmd_recv_stream_2_2(cmd
, stream
);
1295 goto err_free_stream
;
1299 stream
->stream_handle
= ++last_relay_stream_id
;
1300 stream
->prev_seq
= -1ULL;
1301 stream
->session
= session
;
1302 stream
->index_fd
= -1;
1303 stream
->read_index_fd
= -1;
1304 stream
->ctf_trace
= NULL
;
1305 pthread_mutex_init(&stream
->lock
, NULL
);
1307 ret
= utils_mkdir_recursive(stream
->path_name
, S_IRWXU
| S_IRWXG
);
1309 ERR("relay creating output directory");
1314 * No need to use run_as API here because whatever we receives, the relayd
1315 * uses its own credentials for the stream files.
1317 ret
= utils_create_stream_file(stream
->path_name
, stream
->channel_name
,
1318 stream
->tracefile_size
, 0, relayd_uid
, relayd_gid
, NULL
);
1320 ERR("Create output file");
1324 if (stream
->tracefile_size
) {
1325 DBG("Tracefile %s/%s_0 created", stream
->path_name
, stream
->channel_name
);
1327 DBG("Tracefile %s/%s created", stream
->path_name
, stream
->channel_name
);
1330 if (!strncmp(stream
->channel_name
, DEFAULT_METADATA_NAME
, NAME_MAX
)) {
1331 stream
->metadata_flag
= 1;
1333 * When we receive a new metadata stream, we create a new
1334 * ctf_trace and we assign this ctf_trace to all streams with
1337 * If later on we receive a new stream for the same ctf_trace,
1338 * we copy the information from the first hit in the HT to the
1341 stream
->ctf_trace
= ctf_trace_create();
1342 if (!stream
->ctf_trace
) {
1346 stream
->ctf_trace
->refcount
++;
1347 stream
->ctf_trace
->metadata_stream
= stream
;
1349 ctf_trace_assign(cmd
->ctf_traces_ht
, stream
);
1350 stream
->ctf_traces_ht
= cmd
->ctf_traces_ht
;
1353 * Add the stream handle in the recv list of the connection. Once the end
1354 * stream message is received, this list is emptied and streams are set
1355 * with the viewer ready flag.
1357 queue_stream_handle(stream
->stream_handle
, cmd
);
1359 lttng_ht_node_init_ulong(&stream
->stream_n
,
1360 (unsigned long) stream
->stream_handle
);
1361 lttng_ht_add_unique_ulong(relay_streams_ht
,
1364 lttng_ht_node_init_str(&stream
->ctf_trace_node
, stream
->path_name
);
1365 lttng_ht_add_str(cmd
->ctf_traces_ht
, &stream
->ctf_trace_node
);
1366 session
->stream_count
++;
1368 DBG("Relay new stream added %s with ID %" PRIu64
, stream
->channel_name
,
1369 stream
->stream_handle
);
1372 reply
.handle
= htobe64(stream
->stream_handle
);
1373 /* send the session id to the client or a negative return code on error */
1375 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1376 /* stream was not properly added to the ht, so free it */
1379 reply
.ret_code
= htobe32(LTTNG_OK
);
1382 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1383 sizeof(struct lttcomm_relayd_status_stream
), 0);
1385 ERR("Relay sending stream id");
1394 free(stream
->path_name
);
1395 free(stream
->channel_name
);
1401 * relay_close_stream: close a specific stream
1404 int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1405 struct relay_command
*cmd
)
1408 struct relay_session
*session
= cmd
->session
;
1409 struct lttcomm_relayd_close_stream stream_info
;
1410 struct lttcomm_relayd_generic_reply reply
;
1411 struct relay_stream
*stream
;
1413 DBG("Close stream received");
1415 if (!session
|| cmd
->version_check_done
== 0) {
1416 ERR("Trying to close a stream before version check");
1418 goto end_no_session
;
1421 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
1422 sizeof(struct lttcomm_relayd_close_stream
), 0);
1423 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1425 /* Orderly shutdown. Not necessary to print an error. */
1426 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1428 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1431 goto end_no_session
;
1435 stream
= relay_stream_find_by_id(be64toh(stream_info
.stream_id
));
1441 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1442 stream
->close_flag
= 1;
1443 session
->stream_count
--;
1444 assert(session
->stream_count
>= 0);
1446 if (close_stream_check(stream
)) {
1447 destroy_stream(stream
);
1454 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1456 reply
.ret_code
= htobe32(LTTNG_OK
);
1458 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1459 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1461 ERR("Relay sending stream id");
1470 * relay_unknown_command: send -1 if received unknown command
1473 void relay_unknown_command(struct relay_command
*cmd
)
1475 struct lttcomm_relayd_generic_reply reply
;
1478 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1479 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1480 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1482 ERR("Relay sending unknown command");
1487 * relay_start: send an acknowledgment to the client to tell if we are
1488 * ready to receive data. We are ready if a session is established.
1491 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1492 struct relay_command
*cmd
)
1494 int ret
= htobe32(LTTNG_OK
);
1495 struct lttcomm_relayd_generic_reply reply
;
1496 struct relay_session
*session
= cmd
->session
;
1499 DBG("Trying to start the streaming without a session established");
1500 ret
= htobe32(LTTNG_ERR_UNK
);
1503 reply
.ret_code
= ret
;
1504 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1505 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1507 ERR("Relay sending start ack");
1514 * Append padding to the file pointed by the file descriptor fd.
1516 static int write_padding_to_file(int fd
, uint32_t size
)
1525 zeros
= zmalloc(size
);
1526 if (zeros
== NULL
) {
1527 PERROR("zmalloc zeros for padding");
1532 ret
= lttng_write(fd
, zeros
, size
);
1534 PERROR("write padding to file");
1544 * relay_recv_metadata: receive the metada for the session.
1547 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1548 struct relay_command
*cmd
)
1550 int ret
= htobe32(LTTNG_OK
);
1552 struct relay_session
*session
= cmd
->session
;
1553 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1554 struct relay_stream
*metadata_stream
;
1555 uint64_t data_size
, payload_size
;
1558 ERR("Metadata sent before version check");
1563 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1564 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1565 ERR("Incorrect data size");
1569 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1571 if (data_buffer_size
< data_size
) {
1572 /* In case the realloc fails, we can free the memory */
1575 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1576 if (!tmp_data_ptr
) {
1577 ERR("Allocating data buffer");
1582 data_buffer
= tmp_data_ptr
;
1583 data_buffer_size
= data_size
;
1585 memset(data_buffer
, 0, data_size
);
1586 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1587 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1588 if (ret
< 0 || ret
!= data_size
) {
1590 /* Orderly shutdown. Not necessary to print an error. */
1591 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1593 ERR("Relay didn't receive the whole metadata");
1598 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1601 metadata_stream
= relay_stream_find_by_id(
1602 be64toh(metadata_struct
->stream_id
));
1603 if (!metadata_stream
) {
1608 size_ret
= lttng_write(metadata_stream
->fd
, metadata_struct
->payload
,
1610 if (size_ret
< payload_size
) {
1611 ERR("Relay error writing metadata on file");
1616 ret
= write_padding_to_file(metadata_stream
->fd
,
1617 be32toh(metadata_struct
->padding_size
));
1621 metadata_stream
->ctf_trace
->metadata_received
+=
1622 payload_size
+ be32toh(metadata_struct
->padding_size
);
1624 DBG2("Relay metadata written");
1633 * relay_send_version: send relayd version number
1636 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1637 struct relay_command
*cmd
, struct lttng_ht
*sessions_ht
)
1640 struct lttcomm_relayd_version reply
, msg
;
1644 cmd
->version_check_done
= 1;
1646 /* Get version from the other side. */
1647 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1648 if (ret
< 0 || ret
!= sizeof(msg
)) {
1650 /* Orderly shutdown. Not necessary to print an error. */
1651 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1653 ERR("Relay failed to receive the version values.");
1659 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1660 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1662 /* Major versions must be the same */
1663 if (reply
.major
!= be32toh(msg
.major
)) {
1664 DBG("Incompatible major versions (%u vs %u), deleting session",
1665 reply
.major
, be32toh(msg
.major
));
1666 relay_delete_session(cmd
, sessions_ht
);
1671 cmd
->major
= reply
.major
;
1672 /* We adapt to the lowest compatible version */
1673 if (reply
.minor
<= be32toh(msg
.minor
)) {
1674 cmd
->minor
= reply
.minor
;
1676 cmd
->minor
= be32toh(msg
.minor
);
1679 reply
.major
= htobe32(reply
.major
);
1680 reply
.minor
= htobe32(reply
.minor
);
1681 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1682 sizeof(struct lttcomm_relayd_version
), 0);
1684 ERR("Relay sending version");
1687 DBG("Version check done using protocol %u.%u", cmd
->major
,
1695 * Check for data pending for a given stream id from the session daemon.
1698 int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1699 struct relay_command
*cmd
)
1701 struct relay_session
*session
= cmd
->session
;
1702 struct lttcomm_relayd_data_pending msg
;
1703 struct lttcomm_relayd_generic_reply reply
;
1704 struct relay_stream
*stream
;
1706 uint64_t last_net_seq_num
, stream_id
;
1708 DBG("Data pending command received");
1710 if (!session
|| cmd
->version_check_done
== 0) {
1711 ERR("Trying to check for data before version check");
1713 goto end_no_session
;
1716 ret
= cmd
->sock
->ops
->recvmsg(cmd
->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", cmd
->sock
->fd
);
1722 ERR("Relay didn't receive valid data_pending struct size : %d",
1726 goto end_no_session
;
1729 stream_id
= be64toh(msg
.stream_id
);
1730 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1733 stream
= relay_stream_find_by_id(stream_id
);
1734 if (stream
== NULL
) {
1739 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1740 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1743 /* Avoid wrapping issue */
1744 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1745 /* Data has in fact been written and is NOT pending */
1748 /* Data still being streamed thus pending */
1752 /* Pending check is now done. */
1753 stream
->data_pending_check_done
= 1;
1758 reply
.ret_code
= htobe32(ret
);
1759 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1761 ERR("Relay data pending ret code failed");
1769 * Wait for the control socket to reach a quiescent state.
1771 * Note that for now, when receiving this command from the session daemon, this
1772 * means that every subsequent commands or data received on the control socket
1773 * has been handled. So, this is why we simply return OK here.
1776 int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1777 struct relay_command
*cmd
)
1781 struct relay_stream
*stream
;
1782 struct lttng_ht_iter iter
;
1783 struct lttcomm_relayd_quiescent_control msg
;
1784 struct lttcomm_relayd_generic_reply reply
;
1786 DBG("Checking quiescent state on control socket");
1788 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1789 ERR("Trying to check for data before version check");
1791 goto end_no_session
;
1794 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1795 if (ret
< sizeof(msg
)) {
1797 /* Orderly shutdown. Not necessary to print an error. */
1798 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1800 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1804 goto end_no_session
;
1807 stream_id
= be64toh(msg
.stream_id
);
1810 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1812 if (stream
->stream_handle
== stream_id
) {
1813 stream
->data_pending_check_done
= 1;
1814 DBG("Relay quiescent control pending flag set to %" PRIu64
,
1821 reply
.ret_code
= htobe32(LTTNG_OK
);
1822 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1824 ERR("Relay data quiescent control ret code failed");
1832 * Initialize a data pending command. This means that a client is about to ask
1833 * for data pending for each stream he/she holds. Simply iterate over all
1834 * streams of a session and set the data_pending_check_done flag.
1836 * This command returns to the client a LTTNG_OK code.
1839 int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1840 struct relay_command
*cmd
)
1843 struct lttng_ht_iter iter
;
1844 struct lttcomm_relayd_begin_data_pending msg
;
1845 struct lttcomm_relayd_generic_reply reply
;
1846 struct relay_stream
*stream
;
1847 uint64_t session_id
;
1852 DBG("Init streams for data pending");
1854 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1855 ERR("Trying to check for data before version check");
1857 goto end_no_session
;
1860 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1861 if (ret
< sizeof(msg
)) {
1863 /* Orderly shutdown. Not necessary to print an error. */
1864 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1866 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1870 goto end_no_session
;
1873 session_id
= be64toh(msg
.session_id
);
1876 * Iterate over all streams to set the begin data pending flag. For now, the
1877 * streams are indexed by stream handle so we have to iterate over all
1878 * streams to find the one associated with the right session_id.
1881 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1883 if (stream
->session
->id
== session_id
) {
1884 stream
->data_pending_check_done
= 0;
1885 DBG("Set begin data pending flag to stream %" PRIu64
,
1886 stream
->stream_handle
);
1891 /* All good, send back reply. */
1892 reply
.ret_code
= htobe32(LTTNG_OK
);
1894 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1896 ERR("Relay begin data pending send reply failed");
1904 * End data pending command. This will check, for a given session id, if each
1905 * stream associated with it has its data_pending_check_done flag set. If not,
1906 * this means that the client lost track of the stream but the data is still
1907 * being streamed on our side. In this case, we inform the client that data is
1910 * Return to the client if there is data in flight or not with a ret_code.
1913 int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1914 struct relay_command
*cmd
)
1917 struct lttng_ht_iter iter
;
1918 struct lttcomm_relayd_end_data_pending msg
;
1919 struct lttcomm_relayd_generic_reply reply
;
1920 struct relay_stream
*stream
;
1921 uint64_t session_id
;
1922 uint32_t is_data_inflight
= 0;
1927 DBG("End data pending command");
1929 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1930 ERR("Trying to check for data before version check");
1932 goto end_no_session
;
1935 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1936 if (ret
< sizeof(msg
)) {
1938 /* Orderly shutdown. Not necessary to print an error. */
1939 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
1941 ERR("Relay didn't receive valid end data_pending struct size: %d",
1945 goto end_no_session
;
1948 session_id
= be64toh(msg
.session_id
);
1950 /* Iterate over all streams to see if the begin data pending flag is set. */
1952 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1954 if (stream
->session
->id
== session_id
&&
1955 !stream
->data_pending_check_done
) {
1956 is_data_inflight
= 1;
1957 DBG("Data is still in flight for stream %" PRIu64
,
1958 stream
->stream_handle
);
1964 /* All good, send back reply. */
1965 reply
.ret_code
= htobe32(is_data_inflight
);
1967 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1969 ERR("Relay end data pending send reply failed");
1977 * Receive an index for a specific stream.
1979 * Return 0 on success else a negative value.
1982 int relay_recv_index(struct lttcomm_relayd_hdr
*recv_hdr
,
1983 struct relay_command
*cmd
)
1985 int ret
, send_ret
, index_created
= 0;
1986 struct relay_session
*session
= cmd
->session
;
1987 struct lttcomm_relayd_index index_info
;
1988 struct relay_index
*index
, *wr_index
= NULL
;
1989 struct lttcomm_relayd_generic_reply reply
;
1990 struct relay_stream
*stream
;
1991 uint64_t net_seq_num
;
1995 DBG("Relay receiving index");
1997 if (!session
|| cmd
->version_check_done
== 0) {
1998 ERR("Trying to close a stream before version check");
2000 goto end_no_session
;
2003 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &index_info
,
2004 sizeof(index_info
), 0);
2005 if (ret
< sizeof(index_info
)) {
2007 /* Orderly shutdown. Not necessary to print an error. */
2008 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
2010 ERR("Relay didn't receive valid index struct size : %d", ret
);
2013 goto end_no_session
;
2016 net_seq_num
= be64toh(index_info
.net_seq_num
);
2019 stream
= relay_stream_find_by_id(be64toh(index_info
.relay_stream_id
));
2022 goto end_rcu_unlock
;
2025 /* Live beacon handling */
2026 if (index_info
.packet_size
== 0) {
2027 DBG("Received live beacon for stream %" PRIu64
, stream
->stream_handle
);
2030 * Only flag a stream inactive when it has already received data.
2032 if (stream
->total_index_received
> 0) {
2033 stream
->beacon_ts_end
= be64toh(index_info
.timestamp_end
);
2036 goto end_rcu_unlock
;
2038 stream
->beacon_ts_end
= -1ULL;
2041 index
= relay_index_find(stream
->stream_handle
, net_seq_num
);
2043 /* A successful creation will add the object to the HT. */
2044 index
= relay_index_create(stream
->stream_handle
, net_seq_num
);
2046 goto end_rcu_unlock
;
2051 copy_index_control_data(index
, &index_info
);
2053 if (index_created
) {
2055 * Try to add the relay index object to the hash table. If an object
2056 * already exist, destroy back the index created, set the data in this
2057 * object and write it on disk.
2059 relay_index_add(index
, &wr_index
);
2061 copy_index_control_data(wr_index
, &index_info
);
2065 /* The index already exists so write it on disk. */
2069 /* Do we have a writable ready index to write on disk. */
2071 /* Starting at 2.4, create the index file if none available. */
2072 if (cmd
->minor
>= 4 && stream
->index_fd
< 0) {
2073 ret
= index_create_file(stream
->path_name
, stream
->channel_name
,
2074 relayd_uid
, relayd_gid
, stream
->tracefile_size
,
2075 stream
->tracefile_count_current
);
2077 goto end_rcu_unlock
;
2079 stream
->index_fd
= ret
;
2082 ret
= relay_index_write(wr_index
->fd
, wr_index
);
2084 goto end_rcu_unlock
;
2086 stream
->total_index_received
++;
2093 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
2095 reply
.ret_code
= htobe32(LTTNG_OK
);
2097 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
2099 ERR("Relay sending close index id reply");
2108 * Receive the streams_sent message.
2110 * Return 0 on success else a negative value.
2113 int relay_streams_sent(struct lttcomm_relayd_hdr
*recv_hdr
,
2114 struct relay_command
*cmd
)
2117 struct lttcomm_relayd_generic_reply reply
;
2121 DBG("Relay receiving streams_sent");
2123 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
2124 ERR("Trying to close a stream before version check");
2126 goto end_no_session
;
2130 * Flag every pending stream in the connection recv list that they are
2131 * ready to be used by the viewer.
2133 set_viewer_ready_flag(cmd
);
2136 * Inform the viewer that there are new streams in the session.
2138 uatomic_set(&cmd
->session
->new_streams
, 1);
2140 reply
.ret_code
= htobe32(LTTNG_OK
);
2141 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
2143 ERR("Relay sending sent_stream reply");
2155 * Process the commands received on the control socket
2158 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
2159 struct relay_command
*cmd
, struct relay_local_data
*ctx
)
2163 switch (be32toh(recv_hdr
->cmd
)) {
2164 case RELAYD_CREATE_SESSION
:
2165 ret
= relay_create_session(recv_hdr
, cmd
, ctx
->sessions_ht
);
2167 case RELAYD_ADD_STREAM
:
2168 ret
= relay_add_stream(recv_hdr
, cmd
, ctx
->sessions_ht
);
2170 case RELAYD_START_DATA
:
2171 ret
= relay_start(recv_hdr
, cmd
);
2173 case RELAYD_SEND_METADATA
:
2174 ret
= relay_recv_metadata(recv_hdr
, cmd
);
2176 case RELAYD_VERSION
:
2177 ret
= relay_send_version(recv_hdr
, cmd
, ctx
->sessions_ht
);
2179 case RELAYD_CLOSE_STREAM
:
2180 ret
= relay_close_stream(recv_hdr
, cmd
);
2182 case RELAYD_DATA_PENDING
:
2183 ret
= relay_data_pending(recv_hdr
, cmd
);
2185 case RELAYD_QUIESCENT_CONTROL
:
2186 ret
= relay_quiescent_control(recv_hdr
, cmd
);
2188 case RELAYD_BEGIN_DATA_PENDING
:
2189 ret
= relay_begin_data_pending(recv_hdr
, cmd
);
2191 case RELAYD_END_DATA_PENDING
:
2192 ret
= relay_end_data_pending(recv_hdr
, cmd
);
2194 case RELAYD_SEND_INDEX
:
2195 ret
= relay_recv_index(recv_hdr
, cmd
);
2197 case RELAYD_STREAMS_SENT
:
2198 ret
= relay_streams_sent(recv_hdr
, cmd
);
2200 case RELAYD_UPDATE_SYNC_INFO
:
2202 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
2203 relay_unknown_command(cmd
);
2213 * Handle index for a data stream.
2215 * RCU read side lock MUST be acquired.
2217 * Return 0 on success else a negative value.
2219 static int handle_index_data(struct relay_stream
*stream
, uint64_t net_seq_num
,
2222 int ret
= 0, index_created
= 0;
2223 uint64_t stream_id
, data_offset
;
2224 struct relay_index
*index
, *wr_index
= NULL
;
2228 stream_id
= stream
->stream_handle
;
2229 /* Get data offset because we are about to update the index. */
2230 data_offset
= htobe64(stream
->tracefile_size_current
);
2233 * Lookup for an existing index for that stream id/sequence number. If on
2234 * exists, the control thread already received the data for it thus we need
2235 * to write it on disk.
2237 index
= relay_index_find(stream_id
, net_seq_num
);
2239 /* A successful creation will add the object to the HT. */
2240 index
= relay_index_create(stream_id
, net_seq_num
);
2248 if (rotate_index
|| stream
->index_fd
< 0) {
2249 index
->to_close_fd
= stream
->index_fd
;
2250 ret
= index_create_file(stream
->path_name
, stream
->channel_name
,
2251 relayd_uid
, relayd_gid
, stream
->tracefile_size
,
2252 stream
->tracefile_count_current
);
2254 /* This will close the stream's index fd if one. */
2255 relay_index_free_safe(index
);
2258 stream
->index_fd
= ret
;
2260 index
->fd
= stream
->index_fd
;
2261 index
->index_data
.offset
= data_offset
;
2263 if (index_created
) {
2265 * Try to add the relay index object to the hash table. If an object
2266 * already exist, destroy back the index created and set the data.
2268 relay_index_add(index
, &wr_index
);
2270 /* Copy back data from the created index. */
2271 wr_index
->fd
= index
->fd
;
2272 wr_index
->to_close_fd
= index
->to_close_fd
;
2273 wr_index
->index_data
.offset
= data_offset
;
2277 /* The index already exists so write it on disk. */
2281 /* Do we have a writable ready index to write on disk. */
2283 ret
= relay_index_write(wr_index
->fd
, wr_index
);
2287 stream
->total_index_received
++;
2295 * relay_process_data: Process the data received on the data socket
2298 int relay_process_data(struct relay_command
*cmd
)
2300 int ret
= 0, rotate_index
= 0;
2302 struct relay_stream
*stream
;
2303 struct lttcomm_relayd_data_hdr data_hdr
;
2305 uint64_t net_seq_num
;
2308 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &data_hdr
,
2309 sizeof(struct lttcomm_relayd_data_hdr
), 0);
2312 /* Orderly shutdown. Not necessary to print an error. */
2313 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
2315 ERR("Unable to receive data header on sock %d", cmd
->sock
->fd
);
2321 stream_id
= be64toh(data_hdr
.stream_id
);
2324 stream
= relay_stream_find_by_id(stream_id
);
2327 goto end_rcu_unlock
;
2330 data_size
= be32toh(data_hdr
.data_size
);
2331 if (data_buffer_size
< data_size
) {
2334 tmp_data_ptr
= realloc(data_buffer
, data_size
);
2335 if (!tmp_data_ptr
) {
2336 ERR("Allocating data buffer");
2339 goto end_rcu_unlock
;
2341 data_buffer
= tmp_data_ptr
;
2342 data_buffer_size
= data_size
;
2344 memset(data_buffer
, 0, data_size
);
2346 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
2348 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
2349 data_size
, stream_id
, net_seq_num
);
2350 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
2353 /* Orderly shutdown. Not necessary to print an error. */
2354 DBG("Socket %d did an orderly shutdown", cmd
->sock
->fd
);
2357 goto end_rcu_unlock
;
2360 /* Check if a rotation is needed. */
2361 if (stream
->tracefile_size
> 0 &&
2362 (stream
->tracefile_size_current
+ data_size
) >
2363 stream
->tracefile_size
) {
2364 struct relay_viewer_stream
*vstream
;
2367 new_id
= (stream
->tracefile_count_current
+ 1) %
2368 stream
->tracefile_count
;
2370 * When we wrap-around back to 0, we start overwriting old
2373 if (!stream
->tracefile_overwrite
&& new_id
== 0) {
2374 stream
->tracefile_overwrite
= 1;
2376 pthread_mutex_lock(&stream
->viewer_stream_rotation_lock
);
2377 if (stream
->tracefile_overwrite
) {
2378 stream
->oldest_tracefile_id
=
2379 (stream
->oldest_tracefile_id
+ 1) %
2380 stream
->tracefile_count
;
2382 vstream
= live_find_viewer_stream_by_id(stream
->stream_handle
);
2385 * The viewer is reading a file about to be
2386 * overwritten. Close the FDs it is
2387 * currently using and let it handle the fault.
2389 if (vstream
->tracefile_count_current
== new_id
) {
2390 pthread_mutex_lock(&vstream
->overwrite_lock
);
2391 vstream
->abort_flag
= 1;
2392 pthread_mutex_unlock(&vstream
->overwrite_lock
);
2393 DBG("Streaming side setting abort_flag on stream %s_%lu\n",
2394 stream
->channel_name
, new_id
);
2395 } else if (vstream
->tracefile_count_current
==
2396 stream
->tracefile_count_current
) {
2398 * The reader and writer were in the
2399 * same trace file, inform the viewer
2400 * that no new index will ever be added
2403 vstream
->close_write_flag
= 1;
2406 ret
= utils_rotate_stream_file(stream
->path_name
, stream
->channel_name
,
2407 stream
->tracefile_size
, stream
->tracefile_count
,
2408 relayd_uid
, relayd_gid
, stream
->fd
,
2409 &(stream
->tracefile_count_current
), &stream
->fd
);
2410 stream
->total_index_received
= 0;
2411 pthread_mutex_unlock(&stream
->viewer_stream_rotation_lock
);
2413 ERR("Rotating stream output file");
2414 goto end_rcu_unlock
;
2416 /* Reset current size because we just perform a stream rotation. */
2417 stream
->tracefile_size_current
= 0;
2422 * Index are handled in protocol version 2.4 and above. Also, snapshot and
2423 * index are NOT supported.
2425 if (stream
->session
->minor
>= 4 && !stream
->session
->snapshot
) {
2426 ret
= handle_index_data(stream
, net_seq_num
, rotate_index
);
2428 goto end_rcu_unlock
;
2432 /* Write data to stream output fd. */
2433 size_ret
= lttng_write(stream
->fd
, data_buffer
, data_size
);
2434 if (size_ret
< data_size
) {
2435 ERR("Relay error writing data to file");
2437 goto end_rcu_unlock
;
2440 DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64
,
2441 ret
, stream
->stream_handle
);
2443 ret
= write_padding_to_file(stream
->fd
, be32toh(data_hdr
.padding_size
));
2445 goto end_rcu_unlock
;
2447 stream
->tracefile_size_current
+= data_size
+ be32toh(data_hdr
.padding_size
);
2449 stream
->prev_seq
= net_seq_num
;
2451 /* Check if we need to close the FD */
2452 if (close_stream_check(stream
)) {
2453 destroy_stream(stream
);
2463 void relay_cleanup_poll_connection(struct lttng_poll_event
*events
, int pollfd
)
2467 lttng_poll_del(events
, pollfd
);
2469 ret
= close(pollfd
);
2471 ERR("Closing pollfd %d", pollfd
);
2476 int relay_add_connection(int fd
, struct lttng_poll_event
*events
,
2477 struct lttng_ht
*relay_connections_ht
)
2479 struct relay_command
*relay_connection
;
2482 relay_connection
= zmalloc(sizeof(struct relay_command
));
2483 if (relay_connection
== NULL
) {
2484 PERROR("Relay command zmalloc");
2487 ret
= lttng_read(fd
, relay_connection
, sizeof(struct relay_command
));
2488 if (ret
< sizeof(struct relay_command
)) {
2489 PERROR("read relay cmd pipe");
2492 CDS_INIT_LIST_HEAD(&relay_connection
->recv_head
);
2495 * Only used by the control side and the reference is copied inside each
2496 * stream from that connection. Thus a destroy HT must be done after every
2497 * stream has been destroyed.
2499 if (relay_connection
->type
== RELAY_CONTROL
) {
2500 relay_connection
->ctf_traces_ht
= lttng_ht_new(0,
2501 LTTNG_HT_TYPE_STRING
);
2502 if (!relay_connection
->ctf_traces_ht
) {
2507 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
2508 (unsigned long) relay_connection
->sock
->fd
);
2510 lttng_ht_add_unique_ulong(relay_connections_ht
,
2511 &relay_connection
->sock_n
);
2513 return lttng_poll_add(events
,
2514 relay_connection
->sock
->fd
,
2515 LPOLLIN
| LPOLLRDHUP
);
2518 free(relay_connection
);
2524 void deferred_free_connection(struct rcu_head
*head
)
2526 struct relay_command
*relay_connection
=
2527 caa_container_of(head
, struct relay_command
, rcu_node
);
2529 lttcomm_destroy_sock(relay_connection
->sock
);
2530 free(relay_connection
);
2534 void relay_del_connection(struct lttng_ht
*relay_connections_ht
,
2535 struct lttng_ht_iter
*iter
, struct relay_command
*relay_connection
,
2536 struct lttng_ht
*sessions_ht
)
2540 ret
= lttng_ht_del(relay_connections_ht
, iter
);
2543 if (relay_connection
->type
== RELAY_CONTROL
) {
2544 struct relay_stream_recv_handle
*node
, *tmp_node
;
2546 relay_delete_session(relay_connection
, sessions_ht
);
2547 lttng_ht_destroy(relay_connection
->ctf_traces_ht
);
2549 /* Clean up recv list. */
2550 cds_list_for_each_entry_safe(node
, tmp_node
,
2551 &relay_connection
->recv_head
, node
) {
2552 cds_list_del(&node
->node
);
2557 call_rcu(&relay_connection
->rcu_node
, deferred_free_connection
);
2561 * This thread does the actual work
2564 void *relay_thread_worker(void *data
)
2566 int ret
, err
= -1, last_seen_data_fd
= -1;
2568 struct relay_command
*relay_connection
;
2569 struct lttng_poll_event events
;
2570 struct lttng_ht
*relay_connections_ht
;
2571 struct lttng_ht_node_ulong
*node
;
2572 struct lttng_ht_iter iter
;
2573 struct lttcomm_relayd_hdr recv_hdr
;
2574 struct relay_local_data
*relay_ctx
= (struct relay_local_data
*) data
;
2575 struct lttng_ht
*sessions_ht
= relay_ctx
->sessions_ht
;
2577 DBG("[thread] Relay worker started");
2579 rcu_register_thread();
2581 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
2583 if (testpoint(relayd_thread_worker
)) {
2584 goto error_testpoint
;
2587 health_code_update();
2589 /* table of connections indexed on socket */
2590 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2591 if (!relay_connections_ht
) {
2592 goto relay_connections_ht_error
;
2595 /* Tables of received indexes indexed by index handle and net_seq_num. */
2596 indexes_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_TWO_U64
);
2598 goto indexes_ht_error
;
2601 ret
= create_thread_poll_set(&events
, 2);
2603 goto error_poll_create
;
2606 ret
= lttng_poll_add(&events
, relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
2613 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
2615 health_code_update();
2617 /* Infinite blocking call, waiting for transmission */
2618 DBG3("Relayd worker thread polling...");
2619 health_poll_entry();
2620 ret
= lttng_poll_wait(&events
, -1);
2624 * Restart interrupted system call.
2626 if (errno
== EINTR
) {
2635 * Process control. The control connection is prioritised so we don't
2636 * starve it with high throughout put tracing data on the data
2639 for (i
= 0; i
< nb_fd
; i
++) {
2640 /* Fetch once the poll data */
2641 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2642 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2644 health_code_update();
2646 /* Thread quit pipe has been closed. Killing thread. */
2647 ret
= check_thread_quit_pipe(pollfd
, revents
);
2653 /* Inspect the relay cmd pipe for new connection */
2654 if (pollfd
== relay_cmd_pipe
[0]) {
2655 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2656 ERR("Relay pipe error");
2658 } else if (revents
& LPOLLIN
) {
2659 DBG("Relay command received");
2660 ret
= relay_add_connection(relay_cmd_pipe
[0],
2661 &events
, relay_connections_ht
);
2666 } else if (revents
) {
2668 lttng_ht_lookup(relay_connections_ht
,
2669 (void *)((unsigned long) pollfd
),
2671 node
= lttng_ht_iter_get_node_ulong(&iter
);
2673 DBG2("Relay sock %d not found", pollfd
);
2677 relay_connection
= caa_container_of(node
,
2678 struct relay_command
, sock_n
);
2680 if (revents
& (LPOLLERR
)) {
2682 relay_cleanup_poll_connection(&events
, pollfd
);
2683 relay_del_connection(relay_connections_ht
,
2684 &iter
, relay_connection
, sessions_ht
);
2685 if (last_seen_data_fd
== pollfd
) {
2686 last_seen_data_fd
= last_notdel_data_fd
;
2688 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
2689 DBG("Socket %d hung up", pollfd
);
2690 relay_cleanup_poll_connection(&events
, pollfd
);
2691 relay_del_connection(relay_connections_ht
,
2692 &iter
, relay_connection
, sessions_ht
);
2693 if (last_seen_data_fd
== pollfd
) {
2694 last_seen_data_fd
= last_notdel_data_fd
;
2696 } else if (revents
& LPOLLIN
) {
2697 /* control socket */
2698 if (relay_connection
->type
== RELAY_CONTROL
) {
2699 ret
= relay_connection
->sock
->ops
->recvmsg(
2700 relay_connection
->sock
, &recv_hdr
,
2701 sizeof(struct lttcomm_relayd_hdr
), 0);
2702 /* connection closed */
2704 relay_cleanup_poll_connection(&events
, pollfd
);
2705 relay_del_connection(relay_connections_ht
,
2706 &iter
, relay_connection
, sessions_ht
);
2707 DBG("Control connection closed with %d", pollfd
);
2709 if (relay_connection
->session
) {
2710 DBG2("Relay worker receiving data for session : %" PRIu64
,
2711 relay_connection
->session
->id
);
2713 ret
= relay_process_control(&recv_hdr
,
2714 relay_connection
, relay_ctx
);
2716 /* Clear the session on error. */
2717 relay_cleanup_poll_connection(&events
, pollfd
);
2718 relay_del_connection(relay_connections_ht
,
2719 &iter
, relay_connection
, sessions_ht
);
2720 DBG("Connection closed with %d", pollfd
);
2726 * Flag the last seen data fd not deleted. It will be
2727 * used as the last seen fd if any fd gets deleted in
2730 last_notdel_data_fd
= pollfd
;
2738 * The last loop handled a control request, go back to poll to make
2739 * sure we prioritise the control socket.
2745 if (last_seen_data_fd
>= 0) {
2746 for (i
= 0; i
< nb_fd
; i
++) {
2747 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2749 health_code_update();
2751 if (last_seen_data_fd
== pollfd
) {
2758 /* Process data connection. */
2759 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
2760 /* Fetch the poll data. */
2761 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2762 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2764 health_code_update();
2766 /* Skip the command pipe. It's handled in the first loop. */
2767 if (pollfd
== relay_cmd_pipe
[0]) {
2773 lttng_ht_lookup(relay_connections_ht
,
2774 (void *)((unsigned long) pollfd
),
2776 node
= lttng_ht_iter_get_node_ulong(&iter
);
2778 /* Skip it. Might be removed before. */
2782 relay_connection
= caa_container_of(node
,
2783 struct relay_command
, sock_n
);
2785 if (revents
& LPOLLIN
) {
2786 if (relay_connection
->type
!= RELAY_DATA
) {
2790 ret
= relay_process_data(relay_connection
);
2791 /* connection closed */
2793 relay_cleanup_poll_connection(&events
, pollfd
);
2794 relay_del_connection(relay_connections_ht
,
2795 &iter
, relay_connection
, sessions_ht
);
2796 DBG("Data connection closed with %d", pollfd
);
2798 * Every goto restart call sets the last seen fd where
2799 * here we don't really care since we gracefully
2800 * continue the loop after the connection is deleted.
2803 /* Keep last seen port. */
2804 last_seen_data_fd
= pollfd
;
2812 last_seen_data_fd
= -1;
2815 /* Normal exit, no error */
2820 lttng_poll_clean(&events
);
2822 /* empty the hash table and free the memory */
2824 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
2825 health_code_update();
2827 node
= lttng_ht_iter_get_node_ulong(&iter
);
2829 relay_connection
= caa_container_of(node
,
2830 struct relay_command
, sock_n
);
2831 relay_del_connection(relay_connections_ht
,
2832 &iter
, relay_connection
, sessions_ht
);
2837 lttng_ht_destroy(indexes_ht
);
2839 lttng_ht_destroy(relay_connections_ht
);
2840 relay_connections_ht_error
:
2841 /* Close relay cmd pipes */
2842 utils_close_pipe(relay_cmd_pipe
);
2844 DBG("Thread exited with error");
2846 DBG("Worker thread cleanup complete");
2851 ERR("Health error occurred in %s", __func__
);
2853 health_unregister(health_relayd
);
2854 rcu_unregister_thread();
2860 * Create the relay command pipe to wake thread_manage_apps.
2861 * Closed in cleanup().
2863 static int create_relay_cmd_pipe(void)
2867 ret
= utils_create_pipe_cloexec(relay_cmd_pipe
);
2875 int main(int argc
, char **argv
)
2879 struct relay_local_data
*relay_ctx
;
2881 /* Parse arguments */
2883 if ((ret
= set_options(argc
, argv
)) < 0) {
2887 if ((ret
= set_signal_handler()) < 0) {
2891 /* Try to create directory if -o, --output is specified. */
2892 if (opt_output_path
) {
2893 if (*opt_output_path
!= '/') {
2894 ERR("Please specify an absolute path for -o, --output PATH");
2898 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
);
2900 ERR("Unable to create %s", opt_output_path
);
2906 if (opt_daemon
|| opt_background
) {
2909 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
2916 * We are in the child. Make sure all other file
2917 * descriptors are closed, in case we are called with
2918 * more opened file descriptors than the standard ones.
2920 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
2925 /* Create thread quit pipe */
2926 if ((ret
= init_thread_quit_pipe()) < 0) {
2930 /* We need those values for the file/dir creation. */
2931 relayd_uid
= getuid();
2932 relayd_gid
= getgid();
2934 /* Check if daemon is UID = 0 */
2935 if (relayd_uid
== 0) {
2936 if (control_uri
->port
< 1024 || data_uri
->port
< 1024 || live_uri
->port
< 1024) {
2937 ERR("Need to be root to use ports < 1024");
2943 /* Setup the thread apps communication pipe. */
2944 if ((ret
= create_relay_cmd_pipe()) < 0) {
2948 /* Init relay command queue. */
2949 cds_wfq_init(&relay_cmd_queue
.queue
);
2951 /* Set up max poll set size */
2952 lttng_poll_set_max_size();
2954 /* Initialize communication library */
2956 lttcomm_inet_init();
2958 relay_ctx
= zmalloc(sizeof(struct relay_local_data
));
2960 PERROR("relay_ctx");
2964 /* tables of sessions indexed by session ID */
2965 relay_ctx
->sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2966 if (!relay_ctx
->sessions_ht
) {
2967 goto exit_relay_ctx_sessions
;
2970 /* tables of streams indexed by stream ID */
2971 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2972 if (!relay_streams_ht
) {
2973 goto exit_relay_ctx_streams
;
2976 /* tables of streams indexed by stream ID */
2977 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2978 if (!viewer_streams_ht
) {
2979 goto exit_relay_ctx_viewer_streams
;
2982 /* Initialize thread health monitoring */
2983 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
2984 if (!health_relayd
) {
2985 PERROR("health_app_create error");
2986 goto exit_health_app_create
;
2989 ret
= utils_create_pipe(health_quit_pipe
);
2991 goto error_health_pipe
;
2994 /* Create thread to manage the client socket */
2995 ret
= pthread_create(&health_thread
, NULL
,
2996 thread_manage_health
, (void *) NULL
);
2998 PERROR("pthread_create health");
3002 /* Setup the dispatcher thread */
3003 ret
= pthread_create(&dispatcher_thread
, NULL
,
3004 relay_thread_dispatcher
, (void *) NULL
);
3006 PERROR("pthread_create dispatcher");
3007 goto exit_dispatcher
;
3010 /* Setup the worker thread */
3011 ret
= pthread_create(&worker_thread
, NULL
,
3012 relay_thread_worker
, (void *) relay_ctx
);
3014 PERROR("pthread_create worker");
3018 /* Setup the listener thread */
3019 ret
= pthread_create(&listener_thread
, NULL
,
3020 relay_thread_listener
, (void *) NULL
);
3022 PERROR("pthread_create listener");
3026 ret
= live_start_threads(live_uri
, relay_ctx
);
3028 ERR("Starting live viewer threads");
3033 ret
= pthread_join(listener_thread
, &status
);
3035 PERROR("pthread_join");
3036 goto error
; /* join error, exit without cleanup */
3040 ret
= pthread_join(worker_thread
, &status
);
3042 PERROR("pthread_join");
3043 goto error
; /* join error, exit without cleanup */
3047 ret
= pthread_join(dispatcher_thread
, &status
);
3049 PERROR("pthread_join");
3050 goto error
; /* join error, exit without cleanup */
3054 ret
= pthread_join(health_thread
, &status
);
3056 PERROR("pthread_join health thread");
3057 goto error
; /* join error, exit without cleanup */
3061 * Stop live threads only after joining other threads.
3063 live_stop_threads();
3066 utils_close_pipe(health_quit_pipe
);
3069 health_app_destroy(health_relayd
);
3071 exit_health_app_create
:
3072 lttng_ht_destroy(viewer_streams_ht
);
3074 exit_relay_ctx_viewer_streams
:
3075 lttng_ht_destroy(relay_streams_ht
);
3077 exit_relay_ctx_streams
:
3078 lttng_ht_destroy(relay_ctx
->sessions_ht
);
3080 exit_relay_ctx_sessions
: