2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
36 #include <urcu/futex.h>
37 #include <urcu/uatomic.h>
42 #include <lttng/lttng.h>
43 #include <common/common.h>
44 #include <common/compat/poll.h>
45 #include <common/compat/socket.h>
46 #include <common/defaults.h>
47 #include <common/futex.h>
48 #include <common/sessiond-comm/sessiond-comm.h>
49 #include <common/sessiond-comm/inet.h>
50 #include <common/hashtable/hashtable.h>
51 #include <common/sessiond-comm/relayd.h>
52 #include <common/uri.h>
53 #include <common/utils.h>
55 #include "lttng-relayd.h"
57 /* command line options */
58 static int opt_daemon
;
59 static char *opt_output_path
;
60 static struct lttng_uri
*control_uri
;
61 static struct lttng_uri
*data_uri
;
64 static int is_root
; /* Set to 1 if the daemon is running as root */
67 * Quit pipe for all threads. This permits a single cancellation point
68 * for all threads when receiving an event on the pipe.
70 static int thread_quit_pipe
[2] = { -1, -1 };
73 * This pipe is used to inform the worker thread that a command is queued and
74 * ready to be processed.
76 static int relay_cmd_pipe
[2] = { -1, -1 };
78 /* Shared between threads */
79 static int dispatch_thread_exit
;
81 static pthread_t listener_thread
;
82 static pthread_t dispatcher_thread
;
83 static pthread_t worker_thread
;
85 static uint64_t last_relay_stream_id
;
86 static uint64_t last_relay_session_id
;
89 * Relay command queue.
91 * The relay_thread_listener and relay_thread_dispatcher communicate with this
94 static struct relay_cmd_queue relay_cmd_queue
;
96 /* buffer allocated at startup, used to store the trace data */
97 static char *data_buffer
;
98 static unsigned int data_buffer_size
;
101 * usage function on stderr
106 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
107 fprintf(stderr
, " -h, --help Display this usage.\n");
108 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
109 fprintf(stderr
, " -C, --control-port Control port listening (URI)\n");
110 fprintf(stderr
, " -D, --data-port Data port listening (URI)\n");
111 fprintf(stderr
, " -o, --output Output path for traces (PATH)\n");
112 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
116 int parse_args(int argc
, char **argv
)
120 char *default_address
;
122 static struct option long_options
[] = {
123 { "control-port", 1, 0, 'C', },
124 { "data-port", 1, 0, 'D', },
125 { "daemonize", 0, 0, 'd', },
126 { "help", 0, 0, 'h', },
127 { "output", 1, 0, 'o', },
128 { "verbose", 0, 0, 'v', },
133 int option_index
= 0;
134 c
= getopt_long(argc
, argv
, "dhv" "C:D:o:",
135 long_options
, &option_index
);
142 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
144 fprintf(stderr
, " with arg %s\n", optarg
);
148 ret
= uri_parse(optarg
, &control_uri
);
150 ERR("Invalid control URI specified");
153 if (control_uri
->port
== 0) {
154 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
158 ret
= uri_parse(optarg
, &data_uri
);
160 ERR("Invalid data URI specified");
163 if (data_uri
->port
== 0) {
164 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
174 ret
= asprintf(&opt_output_path
, "%s", optarg
);
176 PERROR("asprintf opt_output_path");
181 /* Verbose level can increase using multiple -v */
182 lttng_opt_verbose
+= 1;
185 /* Unknown option or other error.
186 * Error is printed by getopt, just return */
192 /* assign default values */
193 if (control_uri
== NULL
) {
194 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
195 DEFAULT_NETWORK_CONTROL_PORT
);
197 PERROR("asprintf default data address");
201 ret
= uri_parse(default_address
, &control_uri
);
202 free(default_address
);
204 ERR("Invalid control URI specified");
208 if (data_uri
== NULL
) {
209 ret
= asprintf(&default_address
, "tcp://0.0.0.0:%d",
210 DEFAULT_NETWORK_DATA_PORT
);
212 PERROR("asprintf default data address");
216 ret
= uri_parse(default_address
, &data_uri
);
217 free(default_address
);
219 ERR("Invalid data URI specified");
236 /* free the dynamically allocated opt_output_path */
237 free(opt_output_path
);
239 /* Close thread quit pipes */
240 utils_close_pipe(thread_quit_pipe
);
242 uri_free(control_uri
);
247 * Write to writable pipe used to notify a thread.
250 int notify_thread_pipe(int wpipe
)
255 ret
= write(wpipe
, "!", 1);
256 } while (ret
< 0 && errno
== EINTR
);
258 PERROR("write poll pipe");
265 * Stop all threads by closing the thread quit pipe.
268 void stop_threads(void)
272 /* Stopping all threads */
273 DBG("Terminating all threads");
274 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
276 ERR("write error on thread quit pipe");
279 /* Dispatch thread */
280 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
281 futex_nto1_wake(&relay_cmd_queue
.futex
);
285 * Signal handler for the daemon
287 * Simply stop all worker threads, leaving main() return gracefully after
288 * joining all threads and calling cleanup().
291 void sighandler(int sig
)
295 DBG("SIGPIPE caught");
298 DBG("SIGINT caught");
302 DBG("SIGTERM caught");
311 * Setup signal handler for :
312 * SIGINT, SIGTERM, SIGPIPE
315 int set_signal_handler(void)
321 if ((ret
= sigemptyset(&sigset
)) < 0) {
322 PERROR("sigemptyset");
326 sa
.sa_handler
= sighandler
;
329 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
334 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
339 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
344 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
350 * Init thread quit pipe.
352 * Return -1 on error or 0 if all pipes are created.
355 int init_thread_quit_pipe(void)
359 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
365 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
368 int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
372 if (events
== NULL
|| size
== 0) {
377 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
383 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
395 * Check if the thread quit pipe was triggered.
397 * Return 1 if it was triggered else 0;
400 int check_thread_quit_pipe(int fd
, uint32_t events
)
402 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
410 * Create and init socket from uri.
413 struct lttcomm_sock
*relay_init_sock(struct lttng_uri
*uri
)
416 struct lttcomm_sock
*sock
= NULL
;
418 sock
= lttcomm_alloc_sock_from_uri(uri
);
420 ERR("Allocating socket");
424 ret
= lttcomm_create_sock(sock
);
428 DBG("Listening on sock %d", sock
->fd
);
430 ret
= sock
->ops
->bind(sock
);
435 ret
= sock
->ops
->listen(sock
, -1);
445 lttcomm_destroy_sock(sock
);
451 * Return nonzero if stream needs to be closed.
454 int close_stream_check(struct relay_stream
*stream
)
457 if (stream
->close_flag
&& stream
->prev_seq
== stream
->last_net_seq_num
) {
459 * We are about to close the stream so set the data pending flag to 1
460 * which will make the end data pending command skip the stream which
461 * is now closed and ready. Note that after proceeding to a file close,
462 * the written file is ready for reading.
464 stream
->data_pending_check_done
= 1;
471 * This thread manages the listening for new connections on the network
474 void *relay_thread_listener(void *data
)
476 int i
, ret
, pollfd
, err
= -1;
478 uint32_t revents
, nb_fd
;
479 struct lttng_poll_event events
;
480 struct lttcomm_sock
*control_sock
, *data_sock
;
482 DBG("[thread] Relay listener started");
484 control_sock
= relay_init_sock(control_uri
);
486 goto error_sock_control
;
489 data_sock
= relay_init_sock(data_uri
);
491 goto error_sock_relay
;
495 * Pass 3 as size here for the thread quit pipe, control and data socket.
497 ret
= create_thread_poll_set(&events
, 3);
499 goto error_create_poll
;
502 /* Add the control socket */
503 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
508 /* Add the data socket */
509 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
515 DBG("Listener accepting connections");
517 /* Zeroed the events structure */
518 lttng_poll_reset(&events
);
520 nb_fd
= LTTNG_POLL_GETNB(&events
);
523 ret
= lttng_poll_wait(&events
, -1);
526 * Restart interrupted system call.
528 if (errno
== EINTR
) {
534 DBG("Relay new connection received");
535 for (i
= 0; i
< nb_fd
; i
++) {
536 /* Fetch once the poll data */
537 revents
= LTTNG_POLL_GETEV(&events
, i
);
538 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
540 /* Thread quit pipe has been closed. Killing thread. */
541 ret
= check_thread_quit_pipe(pollfd
, revents
);
547 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
548 ERR("socket poll error");
550 } else if (revents
& LPOLLIN
) {
552 * Get allocated in this thread,
553 * enqueued to a global queue, dequeued
554 * and freed in the worker thread.
556 struct relay_command
*relay_cmd
;
557 struct lttcomm_sock
*newsock
;
559 relay_cmd
= zmalloc(sizeof(struct relay_command
));
560 if (relay_cmd
== NULL
) {
561 PERROR("relay command zmalloc");
565 if (pollfd
== data_sock
->fd
) {
566 newsock
= data_sock
->ops
->accept(data_sock
);
568 PERROR("accepting data sock");
572 relay_cmd
->type
= RELAY_DATA
;
573 DBG("Relay data connection accepted, socket %d", newsock
->fd
);
575 assert(pollfd
== control_sock
->fd
);
576 newsock
= control_sock
->ops
->accept(control_sock
);
578 PERROR("accepting control sock");
582 relay_cmd
->type
= RELAY_CONTROL
;
583 DBG("Relay control connection accepted, socket %d", newsock
->fd
);
585 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
,
588 PERROR("setsockopt inet");
589 lttcomm_destroy_sock(newsock
);
593 relay_cmd
->sock
= newsock
;
595 * Lock free enqueue the request.
597 cds_wfq_enqueue(&relay_cmd_queue
.queue
, &relay_cmd
->node
);
600 * Wake the dispatch queue futex. Implicit memory
601 * barrier with the exchange in cds_wfq_enqueue.
603 futex_nto1_wake(&relay_cmd_queue
.futex
);
611 lttng_poll_clean(&events
);
613 if (data_sock
->fd
>= 0) {
614 ret
= data_sock
->ops
->close(data_sock
);
619 lttcomm_destroy_sock(data_sock
);
621 if (control_sock
->fd
>= 0) {
622 ret
= control_sock
->ops
->close(control_sock
);
627 lttcomm_destroy_sock(control_sock
);
630 DBG("Thread exited with error");
632 DBG("Relay listener thread cleanup complete");
638 * This thread manages the dispatching of the requests to worker threads
641 void *relay_thread_dispatcher(void *data
)
644 struct cds_wfq_node
*node
;
645 struct relay_command
*relay_cmd
= NULL
;
647 DBG("[thread] Relay dispatcher started");
649 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
650 /* Atomically prepare the queue futex */
651 futex_nto1_prepare(&relay_cmd_queue
.futex
);
654 /* Dequeue commands */
655 node
= cds_wfq_dequeue_blocking(&relay_cmd_queue
.queue
);
657 DBG("Woken up but nothing in the relay command queue");
658 /* Continue thread execution */
662 relay_cmd
= caa_container_of(node
, struct relay_command
, node
);
663 DBG("Dispatching request waiting on sock %d", relay_cmd
->sock
->fd
);
666 * Inform worker thread of the new request. This
667 * call is blocking so we can be assured that the data will be read
668 * at some point in time or wait to the end of the world :)
671 ret
= write(relay_cmd_pipe
[1], relay_cmd
,
672 sizeof(struct relay_command
));
673 } while (ret
< 0 && errno
== EINTR
);
676 PERROR("write cmd pipe");
679 } while (node
!= NULL
);
681 /* Futex wait on queue. Blocking call on futex() */
682 futex_nto1_wait(&relay_cmd_queue
.futex
);
686 DBG("Dispatch thread dying");
692 * Return the realpath(3) of the path even if the last directory token does not
693 * exist. For example, with /tmp/test1/test2, if test2/ does not exist but the
694 * /tmp/test1 does, the real path is returned. In normal time, realpath(3)
695 * fails if the end point directory does not exist.
698 char *expand_full_path(const char *path
)
700 const char *end_path
= path
;
701 char *next
, *cut_path
, *expanded_path
, *respath
;
703 /* Find last token delimited by '/' */
704 while ((next
= strpbrk(end_path
+ 1, "/"))) {
708 /* Cut last token from original path */
709 cut_path
= strndup(path
, end_path
- path
);
711 expanded_path
= malloc(PATH_MAX
);
712 if (expanded_path
== NULL
) {
717 respath
= realpath(cut_path
, expanded_path
);
718 if (respath
== NULL
) {
721 ERR("%s: No such file or directory", cut_path
);
729 /* Add end part to expanded path */
730 strcat(respath
, end_path
);
739 * config_get_default_path
741 * Returns the HOME directory path. Caller MUST NOT free(3) the return pointer.
744 char *config_get_default_path(void)
746 return getenv("HOME");
750 * Create recursively directory using the FULL path.
753 int mkdir_recursive(char *path
, mode_t mode
)
755 char *p
, tmp
[PATH_MAX
];
760 ret
= snprintf(tmp
, sizeof(tmp
), "%s", path
);
762 PERROR("snprintf mkdir");
767 if (tmp
[len
- 1] == '/') {
771 for (p
= tmp
+ 1; *p
; p
++) {
774 if (tmp
[strlen(tmp
) - 1] == '.' &&
775 tmp
[strlen(tmp
) - 2] == '.' &&
776 tmp
[strlen(tmp
) - 3] == '/') {
777 ERR("Using '/../' is not permitted in the trace path (%s)",
782 ret
= stat(tmp
, &statbuf
);
784 ret
= mkdir(tmp
, mode
);
786 if (errno
!= EEXIST
) {
787 PERROR("mkdir recursive");
797 ret
= mkdir(tmp
, mode
);
799 if (errno
!= EEXIST
) {
800 PERROR("mkdir recursive last piece");
812 char *create_output_path_auto(char *path_name
)
815 char *traces_path
= NULL
;
816 char *alloc_path
= NULL
;
819 default_path
= config_get_default_path();
820 if (default_path
== NULL
) {
821 ERR("Home path not found.\n \
822 Please specify an output path using -o, --output PATH");
825 alloc_path
= strdup(default_path
);
826 if (alloc_path
== NULL
) {
827 PERROR("Path allocation");
830 ret
= asprintf(&traces_path
, "%s/" DEFAULT_TRACE_DIR_NAME
831 "/%s", alloc_path
, path_name
);
833 PERROR("asprintf trace dir name");
842 char *create_output_path_noauto(char *path_name
)
845 char *traces_path
= NULL
;
848 full_path
= expand_full_path(opt_output_path
);
849 ret
= asprintf(&traces_path
, "%s/%s", full_path
, path_name
);
851 PERROR("asprintf trace dir name");
860 * create_output_path: create the output trace directory
863 char *create_output_path(char *path_name
)
865 if (opt_output_path
== NULL
) {
866 return create_output_path_auto(path_name
);
868 return create_output_path_noauto(path_name
);
873 void deferred_free_stream(struct rcu_head
*head
)
875 struct relay_stream
*stream
=
876 caa_container_of(head
, struct relay_stream
, rcu_node
);
881 * relay_delete_session: Free all memory associated with a session and
885 void relay_delete_session(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
887 struct lttng_ht_iter iter
;
888 struct lttng_ht_node_ulong
*node
;
889 struct relay_stream
*stream
;
896 DBG("Relay deleting session %" PRIu64
, cmd
->session
->id
);
899 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, node
, node
) {
900 node
= lttng_ht_iter_get_node_ulong(&iter
);
902 stream
= caa_container_of(node
,
903 struct relay_stream
, stream_n
);
904 if (stream
->session
== cmd
->session
) {
905 ret
= close(stream
->fd
);
907 PERROR("close stream fd on delete session");
909 ret
= lttng_ht_del(streams_ht
, &iter
);
911 call_rcu(&stream
->rcu_node
,
912 deferred_free_stream
);
922 * Handle the RELAYD_CREATE_SESSION command.
924 * On success, send back the session id or else return a negative value.
927 int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
928 struct relay_command
*cmd
)
930 int ret
= 0, send_ret
;
931 struct relay_session
*session
;
932 struct lttcomm_relayd_status_session reply
;
937 memset(&reply
, 0, sizeof(reply
));
939 session
= zmalloc(sizeof(struct relay_session
));
940 if (session
== NULL
) {
941 PERROR("relay session zmalloc");
946 session
->id
= ++last_relay_session_id
;
947 session
->sock
= cmd
->sock
;
948 cmd
->session
= session
;
950 reply
.session_id
= htobe64(session
->id
);
952 DBG("Created session %" PRIu64
, session
->id
);
956 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
958 reply
.ret_code
= htobe32(LTTNG_OK
);
961 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
963 ERR("Relayd sending session id");
970 * relay_add_stream: allocate a new stream for a session
973 int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
974 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
976 struct relay_session
*session
= cmd
->session
;
977 struct lttcomm_relayd_add_stream stream_info
;
978 struct relay_stream
*stream
= NULL
;
979 struct lttcomm_relayd_status_stream reply
;
980 char *path
= NULL
, *root_path
= NULL
;
983 if (!session
|| cmd
->version_check_done
== 0) {
984 ERR("Trying to add a stream before version check");
989 /* FIXME : use data_size for something ? */
990 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
991 sizeof(struct lttcomm_relayd_add_stream
), 0);
992 if (ret
< sizeof(struct lttcomm_relayd_add_stream
)) {
993 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
997 stream
= zmalloc(sizeof(struct relay_stream
));
998 if (stream
== NULL
) {
999 PERROR("relay stream zmalloc");
1001 goto end_no_session
;
1005 stream
->stream_handle
= ++last_relay_stream_id
;
1006 stream
->prev_seq
= -1ULL;
1007 stream
->session
= session
;
1009 root_path
= create_output_path(stream_info
.pathname
);
1014 ret
= mkdir_recursive(root_path
, S_IRWXU
| S_IRWXG
);
1016 ERR("relay creating output directory");
1020 ret
= asprintf(&path
, "%s/%s", root_path
, stream_info
.channel_name
);
1022 PERROR("asprintf stream path");
1026 ret
= open(path
, O_WRONLY
|O_CREAT
|O_TRUNC
, S_IRWXU
|S_IRWXG
|S_IRWXO
);
1028 PERROR("Relay creating trace file");
1033 DBG("Tracefile %s created", path
);
1035 lttng_ht_node_init_ulong(&stream
->stream_n
,
1036 (unsigned long) stream
->stream_handle
);
1037 lttng_ht_add_unique_ulong(streams_ht
,
1040 DBG("Relay new stream added %s", stream_info
.channel_name
);
1045 /* send the session id to the client or a negative return code on error */
1047 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1049 reply
.ret_code
= htobe32(LTTNG_OK
);
1051 reply
.handle
= htobe64(stream
->stream_handle
);
1052 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1053 sizeof(struct lttcomm_relayd_status_stream
), 0);
1055 ERR("Relay sending stream id");
1064 * relay_close_stream: close a specific stream
1067 int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1068 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1070 struct relay_session
*session
= cmd
->session
;
1071 struct lttcomm_relayd_close_stream stream_info
;
1072 struct lttcomm_relayd_generic_reply reply
;
1073 struct relay_stream
*stream
;
1075 struct lttng_ht_node_ulong
*node
;
1076 struct lttng_ht_iter iter
;
1078 DBG("Close stream received");
1080 if (!session
|| cmd
->version_check_done
== 0) {
1081 ERR("Trying to close a stream before version check");
1083 goto end_no_session
;
1086 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &stream_info
,
1087 sizeof(struct lttcomm_relayd_close_stream
), 0);
1088 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1089 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1091 goto end_no_session
;
1095 lttng_ht_lookup(streams_ht
,
1096 (void *)((unsigned long) be64toh(stream_info
.stream_id
)),
1098 node
= lttng_ht_iter_get_node_ulong(&iter
);
1100 DBG("Relay stream %" PRIu64
" not found", be64toh(stream_info
.stream_id
));
1105 stream
= caa_container_of(node
, struct relay_stream
, stream_n
);
1111 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1112 stream
->close_flag
= 1;
1114 if (close_stream_check(stream
)) {
1117 delret
= close(stream
->fd
);
1119 PERROR("close stream");
1121 delret
= lttng_ht_del(streams_ht
, &iter
);
1123 call_rcu(&stream
->rcu_node
,
1124 deferred_free_stream
);
1125 DBG("Closed tracefile %d from close stream", stream
->fd
);
1132 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1134 reply
.ret_code
= htobe32(LTTNG_OK
);
1136 send_ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1137 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1139 ERR("Relay sending stream id");
1147 * relay_unknown_command: send -1 if received unknown command
1150 void relay_unknown_command(struct relay_command
*cmd
)
1152 struct lttcomm_relayd_generic_reply reply
;
1155 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1156 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1157 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1159 ERR("Relay sending unknown command");
1164 * relay_start: send an acknowledgment to the client to tell if we are
1165 * ready to receive data. We are ready if a session is established.
1168 int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1169 struct relay_command
*cmd
)
1171 int ret
= htobe32(LTTNG_OK
);
1172 struct lttcomm_relayd_generic_reply reply
;
1173 struct relay_session
*session
= cmd
->session
;
1176 DBG("Trying to start the streaming without a session established");
1177 ret
= htobe32(LTTNG_ERR_UNK
);
1180 reply
.ret_code
= ret
;
1181 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1182 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1184 ERR("Relay sending start ack");
1191 * Get stream from stream id.
1192 * Need to be called with RCU read-side lock held.
1195 struct relay_stream
*relay_stream_from_stream_id(uint64_t stream_id
,
1196 struct lttng_ht
*streams_ht
)
1198 struct lttng_ht_node_ulong
*node
;
1199 struct lttng_ht_iter iter
;
1200 struct relay_stream
*ret
;
1202 lttng_ht_lookup(streams_ht
,
1203 (void *)((unsigned long) stream_id
),
1205 node
= lttng_ht_iter_get_node_ulong(&iter
);
1207 DBG("Relay stream %" PRIu64
" not found", stream_id
);
1212 ret
= caa_container_of(node
, struct relay_stream
, stream_n
);
1219 * Append padding to the file pointed by the file descriptor fd.
1221 static int write_padding_to_file(int fd
, uint32_t size
)
1230 zeros
= zmalloc(size
);
1231 if (zeros
== NULL
) {
1232 PERROR("zmalloc zeros for padding");
1238 ret
= write(fd
, zeros
, size
);
1239 } while (ret
< 0 && errno
== EINTR
);
1241 PERROR("write padding to file");
1251 * relay_recv_metadata: receive the metada for the session.
1254 int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1255 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1257 int ret
= htobe32(LTTNG_OK
);
1258 struct relay_session
*session
= cmd
->session
;
1259 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1260 struct relay_stream
*metadata_stream
;
1261 uint64_t data_size
, payload_size
;
1264 ERR("Metadata sent before version check");
1269 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1270 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1271 ERR("Incorrect data size");
1275 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1277 if (data_buffer_size
< data_size
) {
1278 /* In case the realloc fails, we can free the memory */
1279 char *tmp_data_ptr
= data_buffer
;
1280 data_buffer
= realloc(data_buffer
, data_size
);
1282 ERR("Allocating data buffer");
1287 data_buffer_size
= data_size
;
1289 memset(data_buffer
, 0, data_size
);
1290 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1291 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1292 if (ret
< 0 || ret
!= data_size
) {
1294 ERR("Relay didn't receive the whole metadata");
1297 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1300 metadata_stream
= relay_stream_from_stream_id(
1301 be64toh(metadata_struct
->stream_id
), streams_ht
);
1302 if (!metadata_stream
) {
1308 ret
= write(metadata_stream
->fd
, metadata_struct
->payload
,
1310 } while (ret
< 0 && errno
== EINTR
);
1311 if (ret
< payload_size
) {
1312 ERR("Relay error writing metadata on file");
1317 ret
= write_padding_to_file(metadata_stream
->fd
,
1318 be32toh(metadata_struct
->padding_size
));
1323 DBG2("Relay metadata written");
1332 * relay_send_version: send relayd version number
1335 int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1336 struct relay_command
*cmd
)
1339 struct lttcomm_relayd_version reply
, msg
;
1343 cmd
->version_check_done
= 1;
1345 /* Get version from the other side. */
1346 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1347 if (ret
< 0 || ret
!= sizeof(msg
)) {
1349 ERR("Relay failed to receive the version values.");
1354 * For now, we just ignore the received version but after 2.1 stable
1355 * release, a check must be done to see if we either adapt to the other
1356 * side version (which MUST be lower than us) or keep the latest data
1357 * structure considering that the other side will adapt.
1360 ret
= sscanf(VERSION
, "%u.%u", &reply
.major
, &reply
.minor
);
1362 ERR("Error in scanning version");
1366 reply
.major
= htobe32(reply
.major
);
1367 reply
.minor
= htobe32(reply
.minor
);
1368 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
,
1369 sizeof(struct lttcomm_relayd_version
), 0);
1371 ERR("Relay sending version");
1373 DBG("Version check done (%u.%u)", be32toh(reply
.major
),
1374 be32toh(reply
.minor
));
1381 * Check for data pending for a given stream id from the session daemon.
1384 int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1385 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1387 struct relay_session
*session
= cmd
->session
;
1388 struct lttcomm_relayd_data_pending msg
;
1389 struct lttcomm_relayd_generic_reply reply
;
1390 struct relay_stream
*stream
;
1392 struct lttng_ht_node_ulong
*node
;
1393 struct lttng_ht_iter iter
;
1394 uint64_t last_net_seq_num
, stream_id
;
1396 DBG("Data pending command received");
1398 if (!session
|| cmd
->version_check_done
== 0) {
1399 ERR("Trying to check for data before version check");
1401 goto end_no_session
;
1404 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1405 if (ret
< sizeof(msg
)) {
1406 ERR("Relay didn't receive valid data_pending struct size : %d", ret
);
1408 goto end_no_session
;
1411 stream_id
= be64toh(msg
.stream_id
);
1412 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1415 lttng_ht_lookup(streams_ht
, (void *)((unsigned long) stream_id
), &iter
);
1416 node
= lttng_ht_iter_get_node_ulong(&iter
);
1418 DBG("Relay stream %" PRIu64
" not found", stream_id
);
1423 stream
= caa_container_of(node
, struct relay_stream
, stream_n
);
1426 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1427 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1430 /* Avoid wrapping issue */
1431 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) <= 0) {
1432 /* Data has in fact been written and is NOT pending */
1435 /* Data still being streamed thus pending */
1439 /* Pending check is now done. */
1440 stream
->data_pending_check_done
= 1;
1445 reply
.ret_code
= htobe32(ret
);
1446 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1448 ERR("Relay data pending ret code failed");
1456 * Wait for the control socket to reach a quiescent state.
1458 * Note that for now, when receiving this command from the session daemon, this
1459 * means that every subsequent commands or data received on the control socket
1460 * has been handled. So, this is why we simply return OK here.
1463 int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1464 struct relay_command
*cmd
)
1467 struct lttcomm_relayd_generic_reply reply
;
1469 DBG("Checking quiescent state on control socket");
1471 reply
.ret_code
= htobe32(LTTNG_OK
);
1472 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1474 ERR("Relay data quiescent control ret code failed");
1481 * Initialize a data pending command. This means that a client is about to ask
1482 * for data pending for each stream he/she holds. Simply iterate over all
1483 * streams of a session and set the data_pending_check_done flag.
1485 * This command returns to the client a LTTNG_OK code.
1488 int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1489 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1492 struct lttng_ht_iter iter
;
1493 struct lttcomm_relayd_begin_data_pending msg
;
1494 struct lttcomm_relayd_generic_reply reply
;
1495 struct relay_stream
*stream
;
1496 uint64_t session_id
;
1502 DBG("Init streams for data pending");
1504 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1505 ERR("Trying to check for data before version check");
1507 goto end_no_session
;
1510 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1511 if (ret
< sizeof(msg
)) {
1512 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1515 goto end_no_session
;
1518 session_id
= be64toh(msg
.session_id
);
1521 * Iterate over all streams to set the begin data pending flag. For now, the
1522 * streams are indexed by stream handle so we have to iterate over all
1523 * streams to find the one associated with the right session_id.
1526 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1527 if (stream
->session
->id
== session_id
) {
1528 stream
->data_pending_check_done
= 0;
1529 DBG("Set begin data pending flag to stream %" PRIu64
,
1530 stream
->stream_handle
);
1535 /* All good, send back reply. */
1536 reply
.ret_code
= htobe32(LTTNG_OK
);
1538 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1540 ERR("Relay begin data pending send reply failed");
1548 * End data pending command. This will check, for a given session id, if each
1549 * stream associated with it has its data_pending_check_done flag set. If not,
1550 * this means that the client lost track of the stream but the data is still
1551 * being streamed on our side. In this case, we inform the client that data is
1554 * Return to the client if there is data in flight or not with a ret_code.
1557 int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1558 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1561 struct lttng_ht_iter iter
;
1562 struct lttcomm_relayd_end_data_pending msg
;
1563 struct lttcomm_relayd_generic_reply reply
;
1564 struct relay_stream
*stream
;
1565 uint64_t session_id
;
1566 uint32_t is_data_inflight
= 0;
1572 DBG("End data pending command");
1574 if (!cmd
->session
|| cmd
->version_check_done
== 0) {
1575 ERR("Trying to check for data before version check");
1577 goto end_no_session
;
1580 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &msg
, sizeof(msg
), 0);
1581 if (ret
< sizeof(msg
)) {
1582 ERR("Relay didn't receive valid end data_pending struct size: %d",
1585 goto end_no_session
;
1588 session_id
= be64toh(msg
.session_id
);
1590 /* Iterate over all streams to see if the begin data pending flag is set. */
1592 cds_lfht_for_each_entry(streams_ht
->ht
, &iter
.iter
, stream
, stream_n
.node
) {
1593 if (stream
->session
->id
== session_id
&&
1594 !stream
->data_pending_check_done
) {
1595 is_data_inflight
= 1;
1596 DBG("Data is still in flight for stream %" PRIu64
,
1597 stream
->stream_handle
);
1603 /* All good, send back reply. */
1604 reply
.ret_code
= htobe32(is_data_inflight
);
1606 ret
= cmd
->sock
->ops
->sendmsg(cmd
->sock
, &reply
, sizeof(reply
), 0);
1608 ERR("Relay end data pending send reply failed");
1616 * relay_process_control: Process the commands received on the control socket
1619 int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1620 struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1624 switch (be32toh(recv_hdr
->cmd
)) {
1625 case RELAYD_CREATE_SESSION
:
1626 ret
= relay_create_session(recv_hdr
, cmd
);
1628 case RELAYD_ADD_STREAM
:
1629 ret
= relay_add_stream(recv_hdr
, cmd
, streams_ht
);
1631 case RELAYD_START_DATA
:
1632 ret
= relay_start(recv_hdr
, cmd
);
1634 case RELAYD_SEND_METADATA
:
1635 ret
= relay_recv_metadata(recv_hdr
, cmd
, streams_ht
);
1637 case RELAYD_VERSION
:
1638 ret
= relay_send_version(recv_hdr
, cmd
);
1640 case RELAYD_CLOSE_STREAM
:
1641 ret
= relay_close_stream(recv_hdr
, cmd
, streams_ht
);
1643 case RELAYD_DATA_PENDING
:
1644 ret
= relay_data_pending(recv_hdr
, cmd
, streams_ht
);
1646 case RELAYD_QUIESCENT_CONTROL
:
1647 ret
= relay_quiescent_control(recv_hdr
, cmd
);
1649 case RELAYD_BEGIN_DATA_PENDING
:
1650 ret
= relay_begin_data_pending(recv_hdr
, cmd
, streams_ht
);
1652 case RELAYD_END_DATA_PENDING
:
1653 ret
= relay_end_data_pending(recv_hdr
, cmd
, streams_ht
);
1655 case RELAYD_UPDATE_SYNC_INFO
:
1657 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
1658 relay_unknown_command(cmd
);
1668 * relay_process_data: Process the data received on the data socket
1671 int relay_process_data(struct relay_command
*cmd
, struct lttng_ht
*streams_ht
)
1674 struct relay_stream
*stream
;
1675 struct lttcomm_relayd_data_hdr data_hdr
;
1677 uint64_t net_seq_num
;
1680 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, &data_hdr
,
1681 sizeof(struct lttcomm_relayd_data_hdr
), 0);
1683 ERR("Connections seems to be closed");
1688 stream_id
= be64toh(data_hdr
.stream_id
);
1691 stream
= relay_stream_from_stream_id(stream_id
, streams_ht
);
1697 data_size
= be32toh(data_hdr
.data_size
);
1698 if (data_buffer_size
< data_size
) {
1699 char *tmp_data_ptr
= data_buffer
;
1700 data_buffer
= realloc(data_buffer
, data_size
);
1702 ERR("Allocating data buffer");
1707 data_buffer_size
= data_size
;
1709 memset(data_buffer
, 0, data_size
);
1711 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
1713 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
1714 data_size
, stream_id
, net_seq_num
);
1715 ret
= cmd
->sock
->ops
->recvmsg(cmd
->sock
, data_buffer
, data_size
, 0);
1722 ret
= write(stream
->fd
, data_buffer
, data_size
);
1723 } while (ret
< 0 && errno
== EINTR
);
1724 if (ret
< data_size
) {
1725 ERR("Relay error writing data to file");
1730 DBG2("Relay wrote %d bytes to tracefile for stream id %" PRIu64
,
1731 ret
, stream
->stream_handle
);
1733 ret
= write_padding_to_file(stream
->fd
, be32toh(data_hdr
.padding_size
));
1738 stream
->prev_seq
= net_seq_num
;
1740 /* Check if we need to close the FD */
1741 if (close_stream_check(stream
)) {
1743 struct lttng_ht_iter iter
;
1745 cret
= close(stream
->fd
);
1747 PERROR("close stream process data");
1749 iter
.iter
.node
= &stream
->stream_n
.node
;
1750 ret
= lttng_ht_del(streams_ht
, &iter
);
1752 call_rcu(&stream
->rcu_node
,
1753 deferred_free_stream
);
1754 DBG("Closed tracefile %d after recv data", stream
->fd
);
1764 void relay_cleanup_poll_connection(struct lttng_poll_event
*events
, int pollfd
)
1768 lttng_poll_del(events
, pollfd
);
1770 ret
= close(pollfd
);
1772 ERR("Closing pollfd %d", pollfd
);
1777 int relay_add_connection(int fd
, struct lttng_poll_event
*events
,
1778 struct lttng_ht
*relay_connections_ht
)
1780 struct relay_command
*relay_connection
;
1783 relay_connection
= zmalloc(sizeof(struct relay_command
));
1784 if (relay_connection
== NULL
) {
1785 PERROR("Relay command zmalloc");
1788 ret
= read(fd
, relay_connection
, sizeof(struct relay_command
));
1789 if (ret
< 0 || ret
< sizeof(struct relay_command
)) {
1790 PERROR("read relay cmd pipe");
1794 lttng_ht_node_init_ulong(&relay_connection
->sock_n
,
1795 (unsigned long) relay_connection
->sock
->fd
);
1797 lttng_ht_add_unique_ulong(relay_connections_ht
,
1798 &relay_connection
->sock_n
);
1800 return lttng_poll_add(events
,
1801 relay_connection
->sock
->fd
,
1802 LPOLLIN
| LPOLLRDHUP
);
1805 free(relay_connection
);
1811 void deferred_free_connection(struct rcu_head
*head
)
1813 struct relay_command
*relay_connection
=
1814 caa_container_of(head
, struct relay_command
, rcu_node
);
1816 lttcomm_destroy_sock(relay_connection
->sock
);
1817 free(relay_connection
);
1821 void relay_del_connection(struct lttng_ht
*relay_connections_ht
,
1822 struct lttng_ht
*streams_ht
, struct lttng_ht_iter
*iter
,
1823 struct relay_command
*relay_connection
)
1827 ret
= lttng_ht_del(relay_connections_ht
, iter
);
1829 if (relay_connection
->type
== RELAY_CONTROL
) {
1830 relay_delete_session(relay_connection
, streams_ht
);
1833 call_rcu(&relay_connection
->rcu_node
,
1834 deferred_free_connection
);
1838 * This thread does the actual work
1841 void *relay_thread_worker(void *data
)
1843 int i
, ret
, pollfd
, err
= -1;
1844 uint32_t revents
, nb_fd
;
1845 struct relay_command
*relay_connection
;
1846 struct lttng_poll_event events
;
1847 struct lttng_ht
*relay_connections_ht
;
1848 struct lttng_ht_node_ulong
*node
;
1849 struct lttng_ht_iter iter
;
1850 struct lttng_ht
*streams_ht
;
1851 struct lttcomm_relayd_hdr recv_hdr
;
1853 DBG("[thread] Relay worker started");
1855 rcu_register_thread();
1857 /* table of connections indexed on socket */
1858 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1859 if (!relay_connections_ht
) {
1860 goto relay_connections_ht_error
;
1863 /* tables of streams indexed by stream ID */
1864 streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
1866 goto streams_ht_error
;
1869 ret
= create_thread_poll_set(&events
, 2);
1871 goto error_poll_create
;
1874 ret
= lttng_poll_add(&events
, relay_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1880 /* Zeroed the events structure */
1881 lttng_poll_reset(&events
);
1883 nb_fd
= LTTNG_POLL_GETNB(&events
);
1885 /* Infinite blocking call, waiting for transmission */
1887 DBG3("Relayd worker thread polling...");
1888 ret
= lttng_poll_wait(&events
, -1);
1891 * Restart interrupted system call.
1893 if (errno
== EINTR
) {
1899 for (i
= 0; i
< nb_fd
; i
++) {
1900 /* Fetch once the poll data */
1901 revents
= LTTNG_POLL_GETEV(&events
, i
);
1902 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1904 /* Thread quit pipe has been closed. Killing thread. */
1905 ret
= check_thread_quit_pipe(pollfd
, revents
);
1911 /* Inspect the relay cmd pipe for new connection */
1912 if (pollfd
== relay_cmd_pipe
[0]) {
1913 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1914 ERR("Relay pipe error");
1916 } else if (revents
& LPOLLIN
) {
1917 DBG("Relay command received");
1918 ret
= relay_add_connection(relay_cmd_pipe
[0],
1919 &events
, relay_connections_ht
);
1924 } else if (revents
> 0) {
1926 lttng_ht_lookup(relay_connections_ht
,
1927 (void *)((unsigned long) pollfd
),
1929 node
= lttng_ht_iter_get_node_ulong(&iter
);
1931 DBG2("Relay sock %d not found", pollfd
);
1935 relay_connection
= caa_container_of(node
,
1936 struct relay_command
, sock_n
);
1938 if (revents
& (LPOLLERR
)) {
1940 relay_cleanup_poll_connection(&events
, pollfd
);
1941 relay_del_connection(relay_connections_ht
,
1944 } else if (revents
& (LPOLLHUP
| LPOLLRDHUP
)) {
1945 DBG("Socket %d hung up", pollfd
);
1946 relay_cleanup_poll_connection(&events
, pollfd
);
1947 relay_del_connection(relay_connections_ht
,
1950 } else if (revents
& LPOLLIN
) {
1951 /* control socket */
1952 if (relay_connection
->type
== RELAY_CONTROL
) {
1953 ret
= relay_connection
->sock
->ops
->recvmsg(
1954 relay_connection
->sock
, &recv_hdr
,
1955 sizeof(struct lttcomm_relayd_hdr
), 0);
1956 /* connection closed */
1958 relay_cleanup_poll_connection(&events
, pollfd
);
1959 relay_del_connection(relay_connections_ht
,
1962 DBG("Control connection closed with %d", pollfd
);
1964 if (relay_connection
->session
) {
1965 DBG2("Relay worker receiving data for session : %" PRIu64
,
1966 relay_connection
->session
->id
);
1968 ret
= relay_process_control(&recv_hdr
,
1972 * there was an error in processing a control
1973 * command: clear the session
1976 relay_cleanup_poll_connection(&events
, pollfd
);
1977 relay_del_connection(relay_connections_ht
,
1980 DBG("Connection closed with %d", pollfd
);
1984 } else if (relay_connection
->type
== RELAY_DATA
) {
1985 ret
= relay_process_data(relay_connection
, streams_ht
);
1986 /* connection closed */
1988 relay_cleanup_poll_connection(&events
, pollfd
);
1989 relay_del_connection(relay_connections_ht
,
1992 DBG("Data connection closed with %d", pollfd
);
2003 lttng_poll_clean(&events
);
2005 /* empty the hash table and free the memory */
2007 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
, node
, node
) {
2008 node
= lttng_ht_iter_get_node_ulong(&iter
);
2010 relay_connection
= caa_container_of(node
,
2011 struct relay_command
, sock_n
);
2012 relay_del_connection(relay_connections_ht
,
2019 lttng_ht_destroy(streams_ht
);
2021 lttng_ht_destroy(relay_connections_ht
);
2022 relay_connections_ht_error
:
2023 /* Close relay cmd pipes */
2024 utils_close_pipe(relay_cmd_pipe
);
2026 DBG("Thread exited with error");
2028 DBG("Worker thread cleanup complete");
2031 rcu_unregister_thread();
2036 * Create the relay command pipe to wake thread_manage_apps.
2037 * Closed in cleanup().
2039 static int create_relay_cmd_pipe(void)
2043 ret
= utils_create_pipe_cloexec(relay_cmd_pipe
);
2051 int main(int argc
, char **argv
)
2056 /* Create thread quit pipe */
2057 if ((ret
= init_thread_quit_pipe()) < 0) {
2061 /* Parse arguments */
2063 if ((ret
= parse_args(argc
, argv
) < 0)) {
2067 if ((ret
= set_signal_handler()) < 0) {
2080 /* Check if daemon is UID = 0 */
2081 is_root
= !getuid();
2084 if (control_uri
->port
< 1024 || data_uri
->port
< 1024) {
2085 ERR("Need to be root to use ports < 1024");
2091 /* Setup the thread apps communication pipe. */
2092 if ((ret
= create_relay_cmd_pipe()) < 0) {
2096 /* Init relay command queue. */
2097 cds_wfq_init(&relay_cmd_queue
.queue
);
2099 /* Set up max poll set size */
2100 lttng_poll_set_max_size();
2102 /* Setup the dispatcher thread */
2103 ret
= pthread_create(&dispatcher_thread
, NULL
,
2104 relay_thread_dispatcher
, (void *) NULL
);
2106 PERROR("pthread_create dispatcher");
2107 goto exit_dispatcher
;
2110 /* Setup the worker thread */
2111 ret
= pthread_create(&worker_thread
, NULL
,
2112 relay_thread_worker
, (void *) NULL
);
2114 PERROR("pthread_create worker");
2118 /* Setup the listener thread */
2119 ret
= pthread_create(&listener_thread
, NULL
,
2120 relay_thread_listener
, (void *) NULL
);
2122 PERROR("pthread_create listener");
2127 ret
= pthread_join(listener_thread
, &status
);
2129 PERROR("pthread_join");
2130 goto error
; /* join error, exit without cleanup */
2134 ret
= pthread_join(worker_thread
, &status
);
2136 PERROR("pthread_join");
2137 goto error
; /* join error, exit without cleanup */
2141 ret
= pthread_join(dispatcher_thread
, &status
);
2143 PERROR("pthread_join");
2144 goto error
; /* join error, exit without cleanup */