2 * Copyright (C) 2012 - Julien Desfossez <jdesfossez@efficios.com>
3 * David Goulet <dgoulet@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 * 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License, version 2 only,
9 * as published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
36 #include <sys/types.h>
39 #include <urcu/futex.h>
40 #include <urcu/uatomic.h>
45 #include <lttng/lttng.h>
46 #include <common/common.h>
47 #include <common/compat/poll.h>
48 #include <common/compat/socket.h>
49 #include <common/compat/endian.h>
50 #include <common/compat/getenv.h>
51 #include <common/defaults.h>
52 #include <common/daemonize.h>
53 #include <common/futex.h>
54 #include <common/sessiond-comm/sessiond-comm.h>
55 #include <common/sessiond-comm/inet.h>
56 #include <common/sessiond-comm/relayd.h>
57 #include <common/uri.h>
58 #include <common/utils.h>
59 #include <common/config/config.h>
60 #include <urcu/rculist.h>
63 #include "ctf-trace.h"
66 #include "lttng-relayd.h"
68 #include "health-relayd.h"
69 #include "testpoint.h"
70 #include "viewer-stream.h"
73 #include "connection.h"
74 #include "tracefile-array.h"
76 /* command line options */
77 char *opt_output_path
;
78 static int opt_daemon
, opt_background
;
81 * We need to wait for listener and live listener threads, as well as
82 * health check thread, before being ready to signal readiness.
84 #define NR_LTTNG_RELAY_READY 3
85 static int lttng_relay_ready
= NR_LTTNG_RELAY_READY
;
86 static int recv_child_signal
; /* Set to 1 when a SIGUSR1 signal is received. */
87 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
89 static struct lttng_uri
*control_uri
;
90 static struct lttng_uri
*data_uri
;
91 static struct lttng_uri
*live_uri
;
95 const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
96 static int tracing_group_name_override
;
98 const char * const config_section_name
= "relayd";
101 * Quit pipe for all threads. This permits a single cancellation point
102 * for all threads when receiving an event on the pipe.
104 int thread_quit_pipe
[2] = { -1, -1 };
107 * This pipe is used to inform the worker thread that a command is queued and
108 * ready to be processed.
110 static int relay_conn_pipe
[2] = { -1, -1 };
112 /* Shared between threads */
113 static int dispatch_thread_exit
;
115 static pthread_t listener_thread
;
116 static pthread_t dispatcher_thread
;
117 static pthread_t worker_thread
;
118 static pthread_t health_thread
;
121 * last_relay_stream_id_lock protects last_relay_stream_id increment
122 * atomicity on 32-bit architectures.
124 static pthread_mutex_t last_relay_stream_id_lock
= PTHREAD_MUTEX_INITIALIZER
;
125 static uint64_t last_relay_stream_id
;
128 * Relay command queue.
130 * The relay_thread_listener and relay_thread_dispatcher communicate with this
133 static struct relay_conn_queue relay_conn_queue
;
135 /* buffer allocated at startup, used to store the trace data */
136 static char *data_buffer
;
137 static unsigned int data_buffer_size
;
139 /* Global relay stream hash table. */
140 struct lttng_ht
*relay_streams_ht
;
142 /* Global relay viewer stream hash table. */
143 struct lttng_ht
*viewer_streams_ht
;
145 /* Global relay sessions hash table. */
146 struct lttng_ht
*sessions_ht
;
148 /* Relayd health monitoring */
149 struct health_app
*health_relayd
;
151 static struct option long_options
[] = {
152 { "control-port", 1, 0, 'C', },
153 { "data-port", 1, 0, 'D', },
154 { "live-port", 1, 0, 'L', },
155 { "daemonize", 0, 0, 'd', },
156 { "background", 0, 0, 'b', },
157 { "group", 1, 0, 'g', },
158 { "help", 0, 0, 'h', },
159 { "output", 1, 0, 'o', },
160 { "verbose", 0, 0, 'v', },
161 { "config", 1, 0, 'f' },
165 static const char *config_ignore_options
[] = { "help", "config" };
168 * usage function on stderr
170 static void usage(void)
172 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
173 fprintf(stderr
, " -h, --help Display this usage.\n");
174 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
175 fprintf(stderr
, " -b, --background Start as a daemon, keeping console open.\n");
176 fprintf(stderr
, " -C, --control-port URL Control port listening.\n");
177 fprintf(stderr
, " -D, --data-port URL Data port listening.\n");
178 fprintf(stderr
, " -L, --live-port URL Live view port listening.\n");
179 fprintf(stderr
, " -o, --output PATH Output path for traces. Must use an absolute path.\n");
180 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
181 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
182 fprintf(stderr
, " -f --config Load daemon configuration file\n");
186 * Take an option from the getopt output and set it in the right variable to be
189 * Return 0 on success else a negative value.
191 static int set_option(int opt
, const char *arg
, const char *optname
)
197 fprintf(stderr
, "option %s", optname
);
199 fprintf(stderr
, " with arg %s\n", arg
);
203 if (lttng_is_setuid_setgid()) {
204 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
205 "-C, --control-port");
207 ret
= uri_parse(arg
, &control_uri
);
209 ERR("Invalid control URI specified");
212 if (control_uri
->port
== 0) {
213 control_uri
->port
= DEFAULT_NETWORK_CONTROL_PORT
;
218 if (lttng_is_setuid_setgid()) {
219 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
222 ret
= uri_parse(arg
, &data_uri
);
224 ERR("Invalid data URI specified");
227 if (data_uri
->port
== 0) {
228 data_uri
->port
= DEFAULT_NETWORK_DATA_PORT
;
233 if (lttng_is_setuid_setgid()) {
234 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
237 ret
= uri_parse(arg
, &live_uri
);
239 ERR("Invalid live URI specified");
242 if (live_uri
->port
== 0) {
243 live_uri
->port
= DEFAULT_NETWORK_VIEWER_PORT
;
254 if (lttng_is_setuid_setgid()) {
255 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
258 tracing_group_name
= strdup(arg
);
259 if (tracing_group_name
== NULL
) {
264 tracing_group_name_override
= 1;
271 if (lttng_is_setuid_setgid()) {
272 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
275 ret
= asprintf(&opt_output_path
, "%s", arg
);
278 PERROR("asprintf opt_output_path");
284 /* Verbose level can increase using multiple -v */
286 lttng_opt_verbose
= config_parse_value(arg
);
288 /* Only 3 level of verbosity (-vvv). */
289 if (lttng_opt_verbose
< 3) {
290 lttng_opt_verbose
+= 1;
295 /* Unknown option or other error.
296 * Error is printed by getopt, just return */
309 * config_entry_handler_cb used to handle options read from a config file.
310 * See config_entry_handler_cb comment in common/config/config.h for the
311 * return value conventions.
313 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
317 if (!entry
|| !entry
->name
|| !entry
->value
) {
322 /* Check if the option is to be ignored */
323 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
324 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
329 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1; i
++) {
330 /* Ignore if entry name is not fully matched. */
331 if (strcmp(entry
->name
, long_options
[i
].name
)) {
336 * If the option takes no argument on the command line,
337 * we have to check if the value is "true". We support
338 * non-zero numeric values, true, on and yes.
340 if (!long_options
[i
].has_arg
) {
341 ret
= config_parse_value(entry
->value
);
344 WARN("Invalid configuration value \"%s\" for option %s",
345 entry
->value
, entry
->name
);
347 /* False, skip boolean config option. */
352 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
356 WARN("Unrecognized option \"%s\" in daemon configuration file.",
363 static int set_options(int argc
, char **argv
)
365 int c
, ret
= 0, option_index
= 0, retval
= 0;
366 int orig_optopt
= optopt
, orig_optind
= optind
;
367 char *default_address
, *optstring
;
368 const char *config_path
= NULL
;
370 optstring
= utils_generate_optstring(long_options
,
371 sizeof(long_options
) / sizeof(struct option
));
377 /* Check for the --config option */
379 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
380 &option_index
)) != -1) {
384 } else if (c
!= 'f') {
388 if (lttng_is_setuid_setgid()) {
389 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
392 config_path
= utils_expand_path(optarg
);
394 ERR("Failed to resolve path: %s", optarg
);
399 ret
= config_get_section_entries(config_path
, config_section_name
,
400 config_entry_handler
, NULL
);
403 ERR("Invalid configuration option at line %i", ret
);
409 /* Reset getopt's global state */
410 optopt
= orig_optopt
;
411 optind
= orig_optind
;
413 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
418 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
425 /* assign default values */
426 if (control_uri
== NULL
) {
427 ret
= asprintf(&default_address
,
428 "tcp://" DEFAULT_NETWORK_CONTROL_BIND_ADDRESS
":%d",
429 DEFAULT_NETWORK_CONTROL_PORT
);
431 PERROR("asprintf default data address");
436 ret
= uri_parse(default_address
, &control_uri
);
437 free(default_address
);
439 ERR("Invalid control URI specified");
444 if (data_uri
== NULL
) {
445 ret
= asprintf(&default_address
,
446 "tcp://" DEFAULT_NETWORK_DATA_BIND_ADDRESS
":%d",
447 DEFAULT_NETWORK_DATA_PORT
);
449 PERROR("asprintf default data address");
454 ret
= uri_parse(default_address
, &data_uri
);
455 free(default_address
);
457 ERR("Invalid data URI specified");
462 if (live_uri
== NULL
) {
463 ret
= asprintf(&default_address
,
464 "tcp://" DEFAULT_NETWORK_VIEWER_BIND_ADDRESS
":%d",
465 DEFAULT_NETWORK_VIEWER_PORT
);
467 PERROR("asprintf default viewer control address");
472 ret
= uri_parse(default_address
, &live_uri
);
473 free(default_address
);
475 ERR("Invalid viewer control URI specified");
486 static void print_global_objects(void)
488 rcu_register_thread();
490 print_viewer_streams();
491 print_relay_streams();
494 rcu_unregister_thread();
500 static void relayd_cleanup(void)
502 print_global_objects();
506 if (viewer_streams_ht
)
507 lttng_ht_destroy(viewer_streams_ht
);
508 if (relay_streams_ht
)
509 lttng_ht_destroy(relay_streams_ht
);
511 lttng_ht_destroy(sessions_ht
);
513 /* free the dynamically allocated opt_output_path */
514 free(opt_output_path
);
516 /* Close thread quit pipes */
517 utils_close_pipe(thread_quit_pipe
);
519 uri_free(control_uri
);
521 /* Live URI is freed in the live thread. */
523 if (tracing_group_name_override
) {
524 free((void *) tracing_group_name
);
529 * Write to writable pipe used to notify a thread.
531 static int notify_thread_pipe(int wpipe
)
535 ret
= lttng_write(wpipe
, "!", 1);
537 PERROR("write poll pipe");
545 static int notify_health_quit_pipe(int *pipe
)
549 ret
= lttng_write(pipe
[1], "4", 1);
551 PERROR("write relay health quit");
560 * Stop all relayd and relayd-live threads.
562 int lttng_relay_stop_threads(void)
566 /* Stopping all threads */
567 DBG("Terminating all threads");
568 if (notify_thread_pipe(thread_quit_pipe
[1])) {
569 ERR("write error on thread quit pipe");
573 if (notify_health_quit_pipe(health_quit_pipe
)) {
574 ERR("write error on health quit pipe");
577 /* Dispatch thread */
578 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
579 futex_nto1_wake(&relay_conn_queue
.futex
);
581 if (relayd_live_stop()) {
582 ERR("Error stopping live threads");
589 * Signal handler for the daemon
591 * Simply stop all worker threads, leaving main() return gracefully after
592 * joining all threads and calling cleanup().
594 static void sighandler(int sig
)
598 DBG("SIGPIPE caught");
601 DBG("SIGINT caught");
602 if (lttng_relay_stop_threads()) {
603 ERR("Error stopping threads");
607 DBG("SIGTERM caught");
608 if (lttng_relay_stop_threads()) {
609 ERR("Error stopping threads");
613 CMM_STORE_SHARED(recv_child_signal
, 1);
621 * Setup signal handler for :
622 * SIGINT, SIGTERM, SIGPIPE
624 static int set_signal_handler(void)
630 if ((ret
= sigemptyset(&sigset
)) < 0) {
631 PERROR("sigemptyset");
635 sa
.sa_handler
= sighandler
;
638 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
643 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
648 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
653 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
658 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
663 void lttng_relay_notify_ready(void)
665 /* Notify the parent of the fork() process that we are ready. */
666 if (opt_daemon
|| opt_background
) {
667 if (uatomic_sub_return(<tng_relay_ready
, 1) == 0) {
668 kill(child_ppid
, SIGUSR1
);
674 * Init thread quit pipe.
676 * Return -1 on error or 0 if all pipes are created.
678 static int init_thread_quit_pipe(void)
682 ret
= utils_create_pipe_cloexec(thread_quit_pipe
);
688 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
690 static int create_thread_poll_set(struct lttng_poll_event
*events
, int size
)
694 if (events
== NULL
|| size
== 0) {
699 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
705 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
717 * Check if the thread quit pipe was triggered.
719 * Return 1 if it was triggered else 0;
721 static int check_thread_quit_pipe(int fd
, uint32_t events
)
723 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
731 * Create and init socket from uri.
733 static struct lttcomm_sock
*relay_socket_create(struct lttng_uri
*uri
)
736 struct lttcomm_sock
*sock
= NULL
;
738 sock
= lttcomm_alloc_sock_from_uri(uri
);
740 ERR("Allocating socket");
744 ret
= lttcomm_create_sock(sock
);
748 DBG("Listening on sock %d", sock
->fd
);
750 ret
= sock
->ops
->bind(sock
);
755 ret
= sock
->ops
->listen(sock
, -1);
765 lttcomm_destroy_sock(sock
);
771 * This thread manages the listening for new connections on the network
773 static void *relay_thread_listener(void *data
)
775 int i
, ret
, pollfd
, err
= -1;
776 uint32_t revents
, nb_fd
;
777 struct lttng_poll_event events
;
778 struct lttcomm_sock
*control_sock
, *data_sock
;
780 DBG("[thread] Relay listener started");
782 health_register(health_relayd
, HEALTH_RELAYD_TYPE_LISTENER
);
784 health_code_update();
786 control_sock
= relay_socket_create(control_uri
);
788 goto error_sock_control
;
791 data_sock
= relay_socket_create(data_uri
);
793 goto error_sock_relay
;
797 * Pass 3 as size here for the thread quit pipe, control and
800 ret
= create_thread_poll_set(&events
, 3);
802 goto error_create_poll
;
805 /* Add the control socket */
806 ret
= lttng_poll_add(&events
, control_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
811 /* Add the data socket */
812 ret
= lttng_poll_add(&events
, data_sock
->fd
, LPOLLIN
| LPOLLRDHUP
);
817 lttng_relay_notify_ready();
819 if (testpoint(relayd_thread_listener
)) {
820 goto error_testpoint
;
824 health_code_update();
826 DBG("Listener accepting connections");
830 ret
= lttng_poll_wait(&events
, -1);
834 * Restart interrupted system call.
836 if (errno
== EINTR
) {
844 DBG("Relay new connection received");
845 for (i
= 0; i
< nb_fd
; i
++) {
846 health_code_update();
848 /* Fetch once the poll data */
849 revents
= LTTNG_POLL_GETEV(&events
, i
);
850 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
854 * No activity for this FD (poll
860 /* Thread quit pipe has been closed. Killing thread. */
861 ret
= check_thread_quit_pipe(pollfd
, revents
);
867 if (revents
& LPOLLIN
) {
869 * A new connection is requested, therefore a
870 * sessiond/consumerd connection is allocated in
871 * this thread, enqueued to a global queue and
872 * dequeued (and freed) in the worker thread.
875 struct relay_connection
*new_conn
;
876 struct lttcomm_sock
*newsock
;
877 enum connection_type type
;
879 if (pollfd
== data_sock
->fd
) {
881 newsock
= data_sock
->ops
->accept(data_sock
);
882 DBG("Relay data connection accepted, socket %d",
885 assert(pollfd
== control_sock
->fd
);
886 type
= RELAY_CONTROL
;
887 newsock
= control_sock
->ops
->accept(control_sock
);
888 DBG("Relay control connection accepted, socket %d",
892 PERROR("accepting sock");
896 ret
= setsockopt(newsock
->fd
, SOL_SOCKET
, SO_REUSEADDR
, &val
,
899 PERROR("setsockopt inet");
900 lttcomm_destroy_sock(newsock
);
903 new_conn
= connection_create(newsock
, type
);
905 lttcomm_destroy_sock(newsock
);
909 /* Enqueue request for the dispatcher thread. */
910 cds_wfcq_enqueue(&relay_conn_queue
.head
, &relay_conn_queue
.tail
,
914 * Wake the dispatch queue futex.
915 * Implicit memory barrier with the
916 * exchange in cds_wfcq_enqueue.
918 futex_nto1_wake(&relay_conn_queue
.futex
);
919 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
920 ERR("socket poll error");
923 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
933 lttng_poll_clean(&events
);
935 if (data_sock
->fd
>= 0) {
936 ret
= data_sock
->ops
->close(data_sock
);
941 lttcomm_destroy_sock(data_sock
);
943 if (control_sock
->fd
>= 0) {
944 ret
= control_sock
->ops
->close(control_sock
);
949 lttcomm_destroy_sock(control_sock
);
953 ERR("Health error occurred in %s", __func__
);
955 health_unregister(health_relayd
);
956 DBG("Relay listener thread cleanup complete");
957 lttng_relay_stop_threads();
962 * This thread manages the dispatching of the requests to worker threads
964 static void *relay_thread_dispatcher(void *data
)
968 struct cds_wfcq_node
*node
;
969 struct relay_connection
*new_conn
= NULL
;
971 DBG("[thread] Relay dispatcher started");
973 health_register(health_relayd
, HEALTH_RELAYD_TYPE_DISPATCHER
);
975 if (testpoint(relayd_thread_dispatcher
)) {
976 goto error_testpoint
;
979 health_code_update();
981 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
982 health_code_update();
984 /* Atomically prepare the queue futex */
985 futex_nto1_prepare(&relay_conn_queue
.futex
);
988 health_code_update();
990 /* Dequeue commands */
991 node
= cds_wfcq_dequeue_blocking(&relay_conn_queue
.head
,
992 &relay_conn_queue
.tail
);
994 DBG("Woken up but nothing in the relay command queue");
995 /* Continue thread execution */
998 new_conn
= caa_container_of(node
, struct relay_connection
, qnode
);
1000 DBG("Dispatching request waiting on sock %d", new_conn
->sock
->fd
);
1003 * Inform worker thread of the new request. This
1004 * call is blocking so we can be assured that
1005 * the data will be read at some point in time
1006 * or wait to the end of the world :)
1008 ret
= lttng_write(relay_conn_pipe
[1], &new_conn
, sizeof(new_conn
));
1010 PERROR("write connection pipe");
1011 connection_put(new_conn
);
1014 } while (node
!= NULL
);
1016 /* Futex wait on queue. Blocking call on futex() */
1017 health_poll_entry();
1018 futex_nto1_wait(&relay_conn_queue
.futex
);
1022 /* Normal exit, no error */
1029 ERR("Health error occurred in %s", __func__
);
1031 health_unregister(health_relayd
);
1032 DBG("Dispatch thread dying");
1033 lttng_relay_stop_threads();
1038 * Set index data from the control port to a given index object.
1040 static int set_index_control_data(struct relay_index
*index
,
1041 struct lttcomm_relayd_index
*data
)
1043 struct ctf_packet_index index_data
;
1046 * The index on disk is encoded in big endian, so we don't need
1047 * to convert the data received on the network. The data_offset
1048 * value is NEVER modified here and is updated by the data
1051 index_data
.packet_size
= data
->packet_size
;
1052 index_data
.content_size
= data
->content_size
;
1053 index_data
.timestamp_begin
= data
->timestamp_begin
;
1054 index_data
.timestamp_end
= data
->timestamp_end
;
1055 index_data
.events_discarded
= data
->events_discarded
;
1056 index_data
.stream_id
= data
->stream_id
;
1057 return relay_index_set_data(index
, &index_data
);
1061 * Handle the RELAYD_CREATE_SESSION command.
1063 * On success, send back the session id or else return a negative value.
1065 static int relay_create_session(struct lttcomm_relayd_hdr
*recv_hdr
,
1066 struct relay_connection
*conn
)
1068 int ret
= 0, send_ret
;
1069 struct relay_session
*session
;
1070 struct lttcomm_relayd_status_session reply
;
1071 char session_name
[LTTNG_NAME_MAX
];
1072 char hostname
[LTTNG_HOST_NAME_MAX
];
1073 uint32_t live_timer
= 0;
1074 bool snapshot
= false;
1076 memset(session_name
, 0, LTTNG_NAME_MAX
);
1077 memset(hostname
, 0, LTTNG_HOST_NAME_MAX
);
1079 memset(&reply
, 0, sizeof(reply
));
1081 switch (conn
->minor
) {
1086 case 4: /* LTTng sessiond 2.4 */
1088 ret
= cmd_create_session_2_4(conn
, session_name
,
1089 hostname
, &live_timer
, &snapshot
);
1095 session
= session_create(session_name
, hostname
, live_timer
,
1096 snapshot
, conn
->major
, conn
->minor
);
1101 assert(!conn
->session
);
1102 conn
->session
= session
;
1103 DBG("Created session %" PRIu64
, session
->id
);
1105 reply
.session_id
= htobe64(session
->id
);
1109 reply
.ret_code
= htobe32(LTTNG_ERR_FATAL
);
1111 reply
.ret_code
= htobe32(LTTNG_OK
);
1114 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1116 ERR("Relayd sending session id");
1124 * When we have received all the streams and the metadata for a channel,
1125 * we make them visible to the viewer threads.
1127 static void publish_connection_local_streams(struct relay_connection
*conn
)
1129 struct relay_stream
*stream
;
1130 struct relay_session
*session
= conn
->session
;
1133 * We publish all streams belonging to a session atomically wrt
1136 pthread_mutex_lock(&session
->lock
);
1138 cds_list_for_each_entry_rcu(stream
, &session
->recv_list
,
1140 stream_publish(stream
);
1145 * Inform the viewer that there are new streams in the session.
1147 if (session
->viewer_attached
) {
1148 uatomic_set(&session
->new_streams
, 1);
1150 pthread_mutex_unlock(&session
->lock
);
1154 * relay_add_stream: allocate a new stream for a session
1156 static int relay_add_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1157 struct relay_connection
*conn
)
1161 struct relay_session
*session
= conn
->session
;
1162 struct relay_stream
*stream
= NULL
;
1163 struct lttcomm_relayd_status_stream reply
;
1164 struct ctf_trace
*trace
= NULL
;
1165 uint64_t stream_handle
= -1ULL;
1166 char *path_name
= NULL
, *channel_name
= NULL
;
1167 uint64_t tracefile_size
= 0, tracefile_count
= 0;
1169 if (!session
|| conn
->version_check_done
== 0) {
1170 ERR("Trying to add a stream before version check");
1172 goto end_no_session
;
1175 switch (session
->minor
) {
1176 case 1: /* LTTng sessiond 2.1. Allocates path_name and channel_name. */
1177 ret
= cmd_recv_stream_2_1(conn
, &path_name
,
1180 case 2: /* LTTng sessiond 2.2. Allocates path_name and channel_name. */
1182 ret
= cmd_recv_stream_2_2(conn
, &path_name
,
1183 &channel_name
, &tracefile_size
, &tracefile_count
);
1190 trace
= ctf_trace_get_by_path_or_create(session
, path_name
);
1194 /* This stream here has one reference on the trace. */
1196 pthread_mutex_lock(&last_relay_stream_id_lock
);
1197 stream_handle
= ++last_relay_stream_id
;
1198 pthread_mutex_unlock(&last_relay_stream_id_lock
);
1200 /* We pass ownership of path_name and channel_name. */
1201 stream
= stream_create(trace
, stream_handle
, path_name
,
1202 channel_name
, tracefile_size
, tracefile_count
);
1204 channel_name
= NULL
;
1207 * Streams are the owners of their trace. Reference to trace is
1208 * kept within stream_create().
1210 ctf_trace_put(trace
);
1213 memset(&reply
, 0, sizeof(reply
));
1214 reply
.handle
= htobe64(stream_handle
);
1216 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1218 reply
.ret_code
= htobe32(LTTNG_OK
);
1221 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1222 sizeof(struct lttcomm_relayd_status_stream
), 0);
1224 ERR("Relay sending stream id");
1225 ret
= (int) send_ret
;
1235 * relay_close_stream: close a specific stream
1237 static int relay_close_stream(struct lttcomm_relayd_hdr
*recv_hdr
,
1238 struct relay_connection
*conn
)
1241 struct relay_session
*session
= conn
->session
;
1242 struct lttcomm_relayd_close_stream stream_info
;
1243 struct lttcomm_relayd_generic_reply reply
;
1244 struct relay_stream
*stream
;
1246 DBG("Close stream received");
1248 if (!session
|| conn
->version_check_done
== 0) {
1249 ERR("Trying to close a stream before version check");
1251 goto end_no_session
;
1254 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &stream_info
,
1255 sizeof(struct lttcomm_relayd_close_stream
), 0);
1256 if (ret
< sizeof(struct lttcomm_relayd_close_stream
)) {
1258 /* Orderly shutdown. Not necessary to print an error. */
1259 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1261 ERR("Relay didn't receive valid add_stream struct size : %d", ret
);
1264 goto end_no_session
;
1267 stream
= stream_get_by_id(be64toh(stream_info
.stream_id
));
1274 * Set last_net_seq_num before the close flag. Required by data
1277 pthread_mutex_lock(&stream
->lock
);
1278 stream
->last_net_seq_num
= be64toh(stream_info
.last_net_seq_num
);
1279 pthread_mutex_unlock(&stream
->lock
);
1282 * This is one of the conditions which may trigger a stream close
1283 * with the others being:
1284 * 1) A close command is received for a stream
1285 * 2) The control connection owning the stream is closed
1286 * 3) We have received all of the stream's data _after_ a close
1289 try_stream_close(stream
);
1290 if (stream
->is_metadata
) {
1291 struct relay_viewer_stream
*vstream
;
1293 vstream
= viewer_stream_get_by_id(stream
->stream_handle
);
1295 if (vstream
->metadata_sent
== stream
->metadata_received
) {
1297 * Since all the metadata has been sent to the
1298 * viewer and that we have a request to close
1299 * its stream, we can safely teardown the
1300 * corresponding metadata viewer stream.
1302 viewer_stream_put(vstream
);
1304 /* Put local reference. */
1305 viewer_stream_put(vstream
);
1311 memset(&reply
, 0, sizeof(reply
));
1313 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1315 reply
.ret_code
= htobe32(LTTNG_OK
);
1317 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1318 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1320 ERR("Relay sending stream id");
1329 * relay_unknown_command: send -1 if received unknown command
1331 static void relay_unknown_command(struct relay_connection
*conn
)
1333 struct lttcomm_relayd_generic_reply reply
;
1336 memset(&reply
, 0, sizeof(reply
));
1337 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1338 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1339 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1341 ERR("Relay sending unknown command");
1346 * relay_start: send an acknowledgment to the client to tell if we are
1347 * ready to receive data. We are ready if a session is established.
1349 static int relay_start(struct lttcomm_relayd_hdr
*recv_hdr
,
1350 struct relay_connection
*conn
)
1352 int ret
= htobe32(LTTNG_OK
);
1353 struct lttcomm_relayd_generic_reply reply
;
1354 struct relay_session
*session
= conn
->session
;
1357 DBG("Trying to start the streaming without a session established");
1358 ret
= htobe32(LTTNG_ERR_UNK
);
1361 memset(&reply
, 0, sizeof(reply
));
1362 reply
.ret_code
= ret
;
1363 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1364 sizeof(struct lttcomm_relayd_generic_reply
), 0);
1366 ERR("Relay sending start ack");
1373 * Append padding to the file pointed by the file descriptor fd.
1375 static int write_padding_to_file(int fd
, uint32_t size
)
1384 zeros
= zmalloc(size
);
1385 if (zeros
== NULL
) {
1386 PERROR("zmalloc zeros for padding");
1391 ret
= lttng_write(fd
, zeros
, size
);
1393 PERROR("write padding to file");
1403 * relay_recv_metadata: receive the metadata for the session.
1405 static int relay_recv_metadata(struct lttcomm_relayd_hdr
*recv_hdr
,
1406 struct relay_connection
*conn
)
1410 struct relay_session
*session
= conn
->session
;
1411 struct lttcomm_relayd_metadata_payload
*metadata_struct
;
1412 struct relay_stream
*metadata_stream
;
1413 uint64_t data_size
, payload_size
;
1416 ERR("Metadata sent before version check");
1421 data_size
= payload_size
= be64toh(recv_hdr
->data_size
);
1422 if (data_size
< sizeof(struct lttcomm_relayd_metadata_payload
)) {
1423 ERR("Incorrect data size");
1427 payload_size
-= sizeof(struct lttcomm_relayd_metadata_payload
);
1429 if (data_buffer_size
< data_size
) {
1430 /* In case the realloc fails, we can free the memory */
1433 tmp_data_ptr
= realloc(data_buffer
, data_size
);
1434 if (!tmp_data_ptr
) {
1435 ERR("Allocating data buffer");
1440 data_buffer
= tmp_data_ptr
;
1441 data_buffer_size
= data_size
;
1443 memset(data_buffer
, 0, data_size
);
1444 DBG2("Relay receiving metadata, waiting for %" PRIu64
" bytes", data_size
);
1445 size_ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, data_size
, 0);
1446 if (size_ret
< 0 || size_ret
!= data_size
) {
1447 if (size_ret
== 0) {
1448 /* Orderly shutdown. Not necessary to print an error. */
1449 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1451 ERR("Relay didn't receive the whole metadata");
1456 metadata_struct
= (struct lttcomm_relayd_metadata_payload
*) data_buffer
;
1458 metadata_stream
= stream_get_by_id(be64toh(metadata_struct
->stream_id
));
1459 if (!metadata_stream
) {
1464 pthread_mutex_lock(&metadata_stream
->lock
);
1466 size_ret
= lttng_write(metadata_stream
->stream_fd
->fd
, metadata_struct
->payload
,
1468 if (size_ret
< payload_size
) {
1469 ERR("Relay error writing metadata on file");
1474 size_ret
= write_padding_to_file(metadata_stream
->stream_fd
->fd
,
1475 be32toh(metadata_struct
->padding_size
));
1480 metadata_stream
->metadata_received
+=
1481 payload_size
+ be32toh(metadata_struct
->padding_size
);
1482 DBG2("Relay metadata written. Updated metadata_received %" PRIu64
,
1483 metadata_stream
->metadata_received
);
1486 pthread_mutex_unlock(&metadata_stream
->lock
);
1487 stream_put(metadata_stream
);
1493 * relay_send_version: send relayd version number
1495 static int relay_send_version(struct lttcomm_relayd_hdr
*recv_hdr
,
1496 struct relay_connection
*conn
)
1499 struct lttcomm_relayd_version reply
, msg
;
1501 conn
->version_check_done
= 1;
1503 /* Get version from the other side. */
1504 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1505 if (ret
< 0 || ret
!= sizeof(msg
)) {
1507 /* Orderly shutdown. Not necessary to print an error. */
1508 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1510 ERR("Relay failed to receive the version values.");
1516 memset(&reply
, 0, sizeof(reply
));
1517 reply
.major
= RELAYD_VERSION_COMM_MAJOR
;
1518 reply
.minor
= RELAYD_VERSION_COMM_MINOR
;
1520 /* Major versions must be the same */
1521 if (reply
.major
!= be32toh(msg
.major
)) {
1522 DBG("Incompatible major versions (%u vs %u), deleting session",
1523 reply
.major
, be32toh(msg
.major
));
1524 connection_put(conn
);
1529 conn
->major
= reply
.major
;
1530 /* We adapt to the lowest compatible version */
1531 if (reply
.minor
<= be32toh(msg
.minor
)) {
1532 conn
->minor
= reply
.minor
;
1534 conn
->minor
= be32toh(msg
.minor
);
1537 reply
.major
= htobe32(reply
.major
);
1538 reply
.minor
= htobe32(reply
.minor
);
1539 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
,
1540 sizeof(struct lttcomm_relayd_version
), 0);
1542 ERR("Relay sending version");
1545 DBG("Version check done using protocol %u.%u", conn
->major
,
1553 * Check for data pending for a given stream id from the session daemon.
1555 static int relay_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1556 struct relay_connection
*conn
)
1558 struct relay_session
*session
= conn
->session
;
1559 struct lttcomm_relayd_data_pending msg
;
1560 struct lttcomm_relayd_generic_reply reply
;
1561 struct relay_stream
*stream
;
1563 uint64_t last_net_seq_num
, stream_id
;
1565 DBG("Data pending command received");
1567 if (!session
|| conn
->version_check_done
== 0) {
1568 ERR("Trying to check for data before version check");
1570 goto end_no_session
;
1573 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1574 if (ret
< sizeof(msg
)) {
1576 /* Orderly shutdown. Not necessary to print an error. */
1577 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1579 ERR("Relay didn't receive valid data_pending struct size : %d",
1583 goto end_no_session
;
1586 stream_id
= be64toh(msg
.stream_id
);
1587 last_net_seq_num
= be64toh(msg
.last_net_seq_num
);
1589 stream
= stream_get_by_id(stream_id
);
1590 if (stream
== NULL
) {
1595 pthread_mutex_lock(&stream
->lock
);
1597 DBG("Data pending for stream id %" PRIu64
" prev_seq %" PRIu64
1598 " and last_seq %" PRIu64
, stream_id
, stream
->prev_seq
,
1601 /* Avoid wrapping issue */
1602 if (((int64_t) (stream
->prev_seq
- last_net_seq_num
)) >= 0) {
1603 /* Data has in fact been written and is NOT pending */
1606 /* Data still being streamed thus pending */
1610 stream
->data_pending_check_done
= true;
1611 pthread_mutex_unlock(&stream
->lock
);
1616 memset(&reply
, 0, sizeof(reply
));
1617 reply
.ret_code
= htobe32(ret
);
1618 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1620 ERR("Relay data pending ret code failed");
1628 * Wait for the control socket to reach a quiescent state.
1630 * Note that for now, when receiving this command from the session
1631 * daemon, this means that every subsequent commands or data received on
1632 * the control socket has been handled. So, this is why we simply return
1635 static int relay_quiescent_control(struct lttcomm_relayd_hdr
*recv_hdr
,
1636 struct relay_connection
*conn
)
1640 struct relay_stream
*stream
;
1641 struct lttcomm_relayd_quiescent_control msg
;
1642 struct lttcomm_relayd_generic_reply reply
;
1644 DBG("Checking quiescent state on control socket");
1646 if (!conn
->session
|| conn
->version_check_done
== 0) {
1647 ERR("Trying to check for data before version check");
1649 goto end_no_session
;
1652 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1653 if (ret
< sizeof(msg
)) {
1655 /* Orderly shutdown. Not necessary to print an error. */
1656 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1658 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1662 goto end_no_session
;
1665 stream_id
= be64toh(msg
.stream_id
);
1666 stream
= stream_get_by_id(stream_id
);
1670 pthread_mutex_lock(&stream
->lock
);
1671 stream
->data_pending_check_done
= true;
1672 pthread_mutex_unlock(&stream
->lock
);
1673 DBG("Relay quiescent control pending flag set to %" PRIu64
, stream_id
);
1676 memset(&reply
, 0, sizeof(reply
));
1677 reply
.ret_code
= htobe32(LTTNG_OK
);
1678 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1680 ERR("Relay data quiescent control ret code failed");
1688 * Initialize a data pending command. This means that a consumer is about
1689 * to ask for data pending for each stream it holds. Simply iterate over
1690 * all streams of a session and set the data_pending_check_done flag.
1692 * This command returns to the client a LTTNG_OK code.
1694 static int relay_begin_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1695 struct relay_connection
*conn
)
1698 struct lttng_ht_iter iter
;
1699 struct lttcomm_relayd_begin_data_pending msg
;
1700 struct lttcomm_relayd_generic_reply reply
;
1701 struct relay_stream
*stream
;
1702 uint64_t session_id
;
1707 DBG("Init streams for data pending");
1709 if (!conn
->session
|| conn
->version_check_done
== 0) {
1710 ERR("Trying to check for data before version check");
1712 goto end_no_session
;
1715 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &msg
, sizeof(msg
), 0);
1716 if (ret
< sizeof(msg
)) {
1718 /* Orderly shutdown. Not necessary to print an error. */
1719 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1721 ERR("Relay didn't receive valid begin data_pending struct size: %d",
1725 goto end_no_session
;
1728 session_id
= be64toh(msg
.session_id
);
1731 * Iterate over all streams to set the begin data pending flag.
1732 * For now, the streams are indexed by stream handle so we have
1733 * to iterate over all streams to find the one associated with
1734 * the right session_id.
1737 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1739 if (!stream_get(stream
)) {
1742 if (stream
->trace
->session
->id
== session_id
) {
1743 pthread_mutex_lock(&stream
->lock
);
1744 stream
->data_pending_check_done
= false;
1745 pthread_mutex_unlock(&stream
->lock
);
1746 DBG("Set begin data pending flag to stream %" PRIu64
,
1747 stream
->stream_handle
);
1753 memset(&reply
, 0, sizeof(reply
));
1754 /* All good, send back reply. */
1755 reply
.ret_code
= htobe32(LTTNG_OK
);
1757 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1759 ERR("Relay begin data pending send reply failed");
1767 * End data pending command. This will check, for a given session id, if
1768 * each stream associated with it has its data_pending_check_done flag
1769 * set. If not, this means that the client lost track of the stream but
1770 * the data is still being streamed on our side. In this case, we inform
1771 * the client that data is in flight.
1773 * Return to the client if there is data in flight or not with a ret_code.
1775 static int relay_end_data_pending(struct lttcomm_relayd_hdr
*recv_hdr
,
1776 struct relay_connection
*conn
)
1779 struct lttng_ht_iter iter
;
1780 struct lttcomm_relayd_end_data_pending msg
;
1781 struct lttcomm_relayd_generic_reply reply
;
1782 struct relay_stream
*stream
;
1783 uint64_t session_id
;
1784 uint32_t is_data_inflight
= 0;
1786 DBG("End data pending command");
1788 if (!conn
->session
|| conn
->version_check_done
== 0) {
1789 ERR("Trying to check for data before version check");
1791 goto end_no_session
;
1794 ret
= conn
->sock
->ops
->recvmsg(conn
->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", conn
->sock
->fd
);
1800 ERR("Relay didn't receive valid end data_pending struct size: %d",
1804 goto end_no_session
;
1807 session_id
= be64toh(msg
.session_id
);
1810 * Iterate over all streams to see if the begin data pending
1814 cds_lfht_for_each_entry(relay_streams_ht
->ht
, &iter
.iter
, stream
,
1816 if (!stream_get(stream
)) {
1819 if (stream
->trace
->session
->id
!= session_id
) {
1823 pthread_mutex_lock(&stream
->lock
);
1824 if (!stream
->data_pending_check_done
) {
1825 if (!stream
->closed
|| !(((int64_t) (stream
->prev_seq
- stream
->last_net_seq_num
)) >= 0)) {
1826 is_data_inflight
= 1;
1827 DBG("Data is still in flight for stream %" PRIu64
,
1828 stream
->stream_handle
);
1829 pthread_mutex_unlock(&stream
->lock
);
1834 pthread_mutex_unlock(&stream
->lock
);
1839 memset(&reply
, 0, sizeof(reply
));
1840 /* All good, send back reply. */
1841 reply
.ret_code
= htobe32(is_data_inflight
);
1843 ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1845 ERR("Relay end data pending send reply failed");
1853 * Receive an index for a specific stream.
1855 * Return 0 on success else a negative value.
1857 static int relay_recv_index(struct lttcomm_relayd_hdr
*recv_hdr
,
1858 struct relay_connection
*conn
)
1861 struct relay_session
*session
= conn
->session
;
1862 struct lttcomm_relayd_index index_info
;
1863 struct relay_index
*index
;
1864 struct lttcomm_relayd_generic_reply reply
;
1865 struct relay_stream
*stream
;
1866 uint64_t net_seq_num
;
1870 DBG("Relay receiving index");
1872 if (!session
|| conn
->version_check_done
== 0) {
1873 ERR("Trying to close a stream before version check");
1875 goto end_no_session
;
1878 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &index_info
,
1879 sizeof(index_info
), 0);
1880 if (ret
< sizeof(index_info
)) {
1882 /* Orderly shutdown. Not necessary to print an error. */
1883 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
1885 ERR("Relay didn't receive valid index struct size : %d", ret
);
1888 goto end_no_session
;
1891 net_seq_num
= be64toh(index_info
.net_seq_num
);
1893 stream
= stream_get_by_id(be64toh(index_info
.relay_stream_id
));
1895 ERR("stream_get_by_id not found");
1899 pthread_mutex_lock(&stream
->lock
);
1901 /* Live beacon handling */
1902 if (index_info
.packet_size
== 0) {
1903 DBG("Received live beacon for stream %" PRIu64
,
1904 stream
->stream_handle
);
1907 * Only flag a stream inactive when it has already
1908 * received data and no indexes are in flight.
1910 if (stream
->index_received_seqcount
> 0
1911 && stream
->indexes_in_flight
== 0) {
1912 stream
->beacon_ts_end
=
1913 be64toh(index_info
.timestamp_end
);
1916 goto end_stream_put
;
1918 stream
->beacon_ts_end
= -1ULL;
1921 if (stream
->ctf_stream_id
== -1ULL) {
1922 stream
->ctf_stream_id
= be64toh(index_info
.stream_id
);
1924 index
= relay_index_get_by_id_or_create(stream
, net_seq_num
);
1927 ERR("relay_index_get_by_id_or_create index NULL");
1928 goto end_stream_put
;
1930 if (set_index_control_data(index
, &index_info
)) {
1931 ERR("set_index_control_data error");
1932 relay_index_put(index
);
1934 goto end_stream_put
;
1936 ret
= relay_index_try_flush(index
);
1938 tracefile_array_commit_seq(stream
->tfa
);
1939 stream
->index_received_seqcount
++;
1940 } else if (ret
> 0) {
1944 ERR("relay_index_try_flush error %d", ret
);
1945 relay_index_put(index
);
1950 pthread_mutex_unlock(&stream
->lock
);
1955 memset(&reply
, 0, sizeof(reply
));
1957 reply
.ret_code
= htobe32(LTTNG_ERR_UNK
);
1959 reply
.ret_code
= htobe32(LTTNG_OK
);
1961 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
1963 ERR("Relay sending close index id reply");
1972 * Receive the streams_sent message.
1974 * Return 0 on success else a negative value.
1976 static int relay_streams_sent(struct lttcomm_relayd_hdr
*recv_hdr
,
1977 struct relay_connection
*conn
)
1980 struct lttcomm_relayd_generic_reply reply
;
1984 DBG("Relay receiving streams_sent");
1986 if (!conn
->session
|| conn
->version_check_done
== 0) {
1987 ERR("Trying to close a stream before version check");
1989 goto end_no_session
;
1993 * Publish every pending stream in the connection recv list which are
1994 * now ready to be used by the viewer.
1996 publish_connection_local_streams(conn
);
1998 memset(&reply
, 0, sizeof(reply
));
1999 reply
.ret_code
= htobe32(LTTNG_OK
);
2000 send_ret
= conn
->sock
->ops
->sendmsg(conn
->sock
, &reply
, sizeof(reply
), 0);
2002 ERR("Relay sending sent_stream reply");
2014 * Process the commands received on the control socket
2016 static int relay_process_control(struct lttcomm_relayd_hdr
*recv_hdr
,
2017 struct relay_connection
*conn
)
2021 switch (be32toh(recv_hdr
->cmd
)) {
2022 case RELAYD_CREATE_SESSION
:
2023 ret
= relay_create_session(recv_hdr
, conn
);
2025 case RELAYD_ADD_STREAM
:
2026 ret
= relay_add_stream(recv_hdr
, conn
);
2028 case RELAYD_START_DATA
:
2029 ret
= relay_start(recv_hdr
, conn
);
2031 case RELAYD_SEND_METADATA
:
2032 ret
= relay_recv_metadata(recv_hdr
, conn
);
2034 case RELAYD_VERSION
:
2035 ret
= relay_send_version(recv_hdr
, conn
);
2037 case RELAYD_CLOSE_STREAM
:
2038 ret
= relay_close_stream(recv_hdr
, conn
);
2040 case RELAYD_DATA_PENDING
:
2041 ret
= relay_data_pending(recv_hdr
, conn
);
2043 case RELAYD_QUIESCENT_CONTROL
:
2044 ret
= relay_quiescent_control(recv_hdr
, conn
);
2046 case RELAYD_BEGIN_DATA_PENDING
:
2047 ret
= relay_begin_data_pending(recv_hdr
, conn
);
2049 case RELAYD_END_DATA_PENDING
:
2050 ret
= relay_end_data_pending(recv_hdr
, conn
);
2052 case RELAYD_SEND_INDEX
:
2053 ret
= relay_recv_index(recv_hdr
, conn
);
2055 case RELAYD_STREAMS_SENT
:
2056 ret
= relay_streams_sent(recv_hdr
, conn
);
2058 case RELAYD_UPDATE_SYNC_INFO
:
2060 ERR("Received unknown command (%u)", be32toh(recv_hdr
->cmd
));
2061 relay_unknown_command(conn
);
2071 * Handle index for a data stream.
2073 * Called with the stream lock held.
2075 * Return 0 on success else a negative value.
2077 static int handle_index_data(struct relay_stream
*stream
, uint64_t net_seq_num
,
2081 uint64_t data_offset
;
2082 struct relay_index
*index
;
2084 /* Get data offset because we are about to update the index. */
2085 data_offset
= htobe64(stream
->tracefile_size_current
);
2087 DBG("handle_index_data: stream %" PRIu64
" net_seq_num %" PRIu64
" data offset %" PRIu64
,
2088 stream
->stream_handle
, net_seq_num
, stream
->tracefile_size_current
);
2091 * Lookup for an existing index for that stream id/sequence
2092 * number. If it exists, the control thread has already received the
2093 * data for it, thus we need to write it to disk.
2095 index
= relay_index_get_by_id_or_create(stream
, net_seq_num
);
2101 if (rotate_index
|| !stream
->index_fd
) {
2104 /* Put ref on previous index_fd. */
2105 if (stream
->index_fd
) {
2106 stream_fd_put(stream
->index_fd
);
2107 stream
->index_fd
= NULL
;
2110 fd
= index_create_file(stream
->path_name
, stream
->channel_name
,
2111 -1, -1, stream
->tracefile_size
,
2112 tracefile_array_get_file_index_head(stream
->tfa
));
2115 /* Put self-ref for this index due to error. */
2116 relay_index_put(index
);
2119 stream
->index_fd
= stream_fd_create(fd
);
2120 if (!stream
->index_fd
) {
2123 PERROR("Error closing FD %d", fd
);
2125 /* Put self-ref for this index due to error. */
2126 relay_index_put(index
);
2127 /* Will put the local ref. */
2132 if (relay_index_set_fd(index
, stream
->index_fd
, data_offset
)) {
2134 /* Put self-ref for this index due to error. */
2135 relay_index_put(index
);
2139 ret
= relay_index_try_flush(index
);
2141 tracefile_array_commit_seq(stream
->tfa
);
2142 stream
->index_received_seqcount
++;
2143 } else if (ret
> 0) {
2147 /* Put self-ref for this index due to error. */
2148 relay_index_put(index
);
2156 * relay_process_data: Process the data received on the data socket
2158 static int relay_process_data(struct relay_connection
*conn
)
2160 int ret
= 0, rotate_index
= 0;
2162 struct relay_stream
*stream
;
2163 struct lttcomm_relayd_data_hdr data_hdr
;
2165 uint64_t net_seq_num
;
2167 struct relay_session
*session
;
2168 bool new_stream
= false, close_requested
= false;
2170 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, &data_hdr
,
2171 sizeof(struct lttcomm_relayd_data_hdr
), 0);
2174 /* Orderly shutdown. Not necessary to print an error. */
2175 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2177 ERR("Unable to receive data header on sock %d", conn
->sock
->fd
);
2183 stream_id
= be64toh(data_hdr
.stream_id
);
2184 stream
= stream_get_by_id(stream_id
);
2186 ERR("relay_process_data: Cannot find stream %" PRIu64
, stream_id
);
2190 session
= stream
->trace
->session
;
2191 data_size
= be32toh(data_hdr
.data_size
);
2192 if (data_buffer_size
< data_size
) {
2195 tmp_data_ptr
= realloc(data_buffer
, data_size
);
2196 if (!tmp_data_ptr
) {
2197 ERR("Allocating data buffer");
2200 goto end_stream_put
;
2202 data_buffer
= tmp_data_ptr
;
2203 data_buffer_size
= data_size
;
2205 memset(data_buffer
, 0, data_size
);
2207 net_seq_num
= be64toh(data_hdr
.net_seq_num
);
2209 DBG3("Receiving data of size %u for stream id %" PRIu64
" seqnum %" PRIu64
,
2210 data_size
, stream_id
, net_seq_num
);
2211 ret
= conn
->sock
->ops
->recvmsg(conn
->sock
, data_buffer
, data_size
, 0);
2214 /* Orderly shutdown. Not necessary to print an error. */
2215 DBG("Socket %d did an orderly shutdown", conn
->sock
->fd
);
2217 ERR("Socket %d error %d", conn
->sock
->fd
, ret
);
2220 goto end_stream_put
;
2223 pthread_mutex_lock(&stream
->lock
);
2225 /* Check if a rotation is needed. */
2226 if (stream
->tracefile_size
> 0 &&
2227 (stream
->tracefile_size_current
+ data_size
) >
2228 stream
->tracefile_size
) {
2229 uint64_t old_id
, new_id
;
2231 old_id
= tracefile_array_get_file_index_head(stream
->tfa
);
2232 tracefile_array_file_rotate(stream
->tfa
);
2234 /* new_id is updated by utils_rotate_stream_file. */
2237 ret
= utils_rotate_stream_file(stream
->path_name
,
2238 stream
->channel_name
, stream
->tracefile_size
,
2239 stream
->tracefile_count
, -1,
2240 -1, stream
->stream_fd
->fd
,
2241 &new_id
, &stream
->stream_fd
->fd
);
2243 ERR("Rotating stream output file");
2244 goto end_stream_unlock
;
2247 * Reset current size because we just performed a stream
2250 stream
->tracefile_size_current
= 0;
2255 * Index are handled in protocol version 2.4 and above. Also,
2256 * snapshot and index are NOT supported.
2258 if (session
->minor
>= 4 && !session
->snapshot
) {
2259 ret
= handle_index_data(stream
, net_seq_num
, rotate_index
);
2261 ERR("handle_index_data: fail stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
2262 stream
->stream_handle
, net_seq_num
, ret
);
2263 goto end_stream_unlock
;
2267 /* Write data to stream output fd. */
2268 size_ret
= lttng_write(stream
->stream_fd
->fd
, data_buffer
, data_size
);
2269 if (size_ret
< data_size
) {
2270 ERR("Relay error writing data to file");
2272 goto end_stream_unlock
;
2275 DBG2("Relay wrote %zd bytes to tracefile for stream id %" PRIu64
,
2276 size_ret
, stream
->stream_handle
);
2278 ret
= write_padding_to_file(stream
->stream_fd
->fd
,
2279 be32toh(data_hdr
.padding_size
));
2281 ERR("write_padding_to_file: fail stream %" PRIu64
" net_seq_num %" PRIu64
" ret %d",
2282 stream
->stream_handle
, net_seq_num
, ret
);
2283 goto end_stream_unlock
;
2285 stream
->tracefile_size_current
+=
2286 data_size
+ be32toh(data_hdr
.padding_size
);
2287 if (stream
->prev_seq
== -1ULL) {
2291 stream
->prev_seq
= net_seq_num
;
2294 close_requested
= stream
->close_requested
;
2295 pthread_mutex_unlock(&stream
->lock
);
2296 if (close_requested
) {
2297 try_stream_close(stream
);
2301 pthread_mutex_lock(&session
->lock
);
2302 uatomic_set(&session
->new_streams
, 1);
2303 pthread_mutex_unlock(&session
->lock
);
2311 static void cleanup_connection_pollfd(struct lttng_poll_event
*events
, int pollfd
)
2315 (void) lttng_poll_del(events
, pollfd
);
2317 ret
= close(pollfd
);
2319 ERR("Closing pollfd %d", pollfd
);
2323 static void relay_thread_close_connection(struct lttng_poll_event
*events
,
2324 int pollfd
, struct relay_connection
*conn
)
2326 const char *type_str
;
2328 switch (conn
->type
) {
2333 type_str
= "Control";
2335 case RELAY_VIEWER_COMMAND
:
2336 type_str
= "Viewer Command";
2338 case RELAY_VIEWER_NOTIFICATION
:
2339 type_str
= "Viewer Notification";
2342 type_str
= "Unknown";
2344 cleanup_connection_pollfd(events
, pollfd
);
2345 connection_put(conn
);
2346 DBG("%s connection closed with %d", type_str
, pollfd
);
2350 * This thread does the actual work
2352 static void *relay_thread_worker(void *data
)
2354 int ret
, err
= -1, last_seen_data_fd
= -1;
2356 struct lttng_poll_event events
;
2357 struct lttng_ht
*relay_connections_ht
;
2358 struct lttng_ht_iter iter
;
2359 struct lttcomm_relayd_hdr recv_hdr
;
2360 struct relay_connection
*destroy_conn
= NULL
;
2362 DBG("[thread] Relay worker started");
2364 rcu_register_thread();
2366 health_register(health_relayd
, HEALTH_RELAYD_TYPE_WORKER
);
2368 if (testpoint(relayd_thread_worker
)) {
2369 goto error_testpoint
;
2372 health_code_update();
2374 /* table of connections indexed on socket */
2375 relay_connections_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_ULONG
);
2376 if (!relay_connections_ht
) {
2377 goto relay_connections_ht_error
;
2380 ret
= create_thread_poll_set(&events
, 2);
2382 goto error_poll_create
;
2385 ret
= lttng_poll_add(&events
, relay_conn_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
2392 int idx
= -1, i
, seen_control
= 0, last_notdel_data_fd
= -1;
2394 health_code_update();
2396 /* Infinite blocking call, waiting for transmission */
2397 DBG3("Relayd worker thread polling...");
2398 health_poll_entry();
2399 ret
= lttng_poll_wait(&events
, -1);
2403 * Restart interrupted system call.
2405 if (errno
== EINTR
) {
2414 * Process control. The control connection is
2415 * prioritized so we don't starve it with high
2416 * throughput tracing data on the data connection.
2418 for (i
= 0; i
< nb_fd
; i
++) {
2419 /* Fetch once the poll data */
2420 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2421 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2423 health_code_update();
2427 * No activity for this FD (poll
2433 /* Thread quit pipe has been closed. Killing thread. */
2434 ret
= check_thread_quit_pipe(pollfd
, revents
);
2440 /* Inspect the relay conn pipe for new connection */
2441 if (pollfd
== relay_conn_pipe
[0]) {
2442 if (revents
& LPOLLIN
) {
2443 struct relay_connection
*conn
;
2445 ret
= lttng_read(relay_conn_pipe
[0], &conn
, sizeof(conn
));
2449 lttng_poll_add(&events
, conn
->sock
->fd
,
2450 LPOLLIN
| LPOLLRDHUP
);
2451 connection_ht_add(relay_connections_ht
, conn
);
2452 DBG("Connection socket %d added", conn
->sock
->fd
);
2453 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2454 ERR("Relay connection pipe error");
2457 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2461 struct relay_connection
*ctrl_conn
;
2463 ctrl_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
2464 /* If not found, there is a synchronization issue. */
2467 if (ctrl_conn
->type
== RELAY_DATA
) {
2468 if (revents
& LPOLLIN
) {
2470 * Flag the last seen data fd not deleted. It will be
2471 * used as the last seen fd if any fd gets deleted in
2474 last_notdel_data_fd
= pollfd
;
2476 goto put_ctrl_connection
;
2478 assert(ctrl_conn
->type
== RELAY_CONTROL
);
2480 if (revents
& LPOLLIN
) {
2481 ret
= ctrl_conn
->sock
->ops
->recvmsg(ctrl_conn
->sock
,
2482 &recv_hdr
, sizeof(recv_hdr
), 0);
2484 /* Connection closed */
2485 relay_thread_close_connection(&events
, pollfd
,
2488 ret
= relay_process_control(&recv_hdr
, ctrl_conn
);
2490 /* Clear the session on error. */
2491 relay_thread_close_connection(&events
,
2496 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2497 relay_thread_close_connection(&events
,
2499 if (last_seen_data_fd
== pollfd
) {
2500 last_seen_data_fd
= last_notdel_data_fd
;
2503 ERR("Unexpected poll events %u for control sock %d",
2505 connection_put(ctrl_conn
);
2508 put_ctrl_connection
:
2509 connection_put(ctrl_conn
);
2514 * The last loop handled a control request, go back to poll to make
2515 * sure we prioritise the control socket.
2521 if (last_seen_data_fd
>= 0) {
2522 for (i
= 0; i
< nb_fd
; i
++) {
2523 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2525 health_code_update();
2527 if (last_seen_data_fd
== pollfd
) {
2534 /* Process data connection. */
2535 for (i
= idx
+ 1; i
< nb_fd
; i
++) {
2536 /* Fetch the poll data. */
2537 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
2538 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2539 struct relay_connection
*data_conn
;
2541 health_code_update();
2544 /* No activity for this FD (poll implementation). */
2548 /* Skip the command pipe. It's handled in the first loop. */
2549 if (pollfd
== relay_conn_pipe
[0]) {
2553 data_conn
= connection_get_by_sock(relay_connections_ht
, pollfd
);
2555 /* Skip it. Might be removed before. */
2558 if (data_conn
->type
== RELAY_CONTROL
) {
2559 goto put_data_connection
;
2561 assert(data_conn
->type
== RELAY_DATA
);
2563 if (revents
& LPOLLIN
) {
2564 ret
= relay_process_data(data_conn
);
2565 /* Connection closed */
2567 relay_thread_close_connection(&events
, pollfd
,
2570 * Every goto restart call sets the last seen fd where
2571 * here we don't really care since we gracefully
2572 * continue the loop after the connection is deleted.
2575 /* Keep last seen port. */
2576 last_seen_data_fd
= pollfd
;
2577 connection_put(data_conn
);
2580 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2581 relay_thread_close_connection(&events
, pollfd
,
2584 ERR("Unknown poll events %u for data sock %d",
2587 put_data_connection
:
2588 connection_put(data_conn
);
2590 last_seen_data_fd
= -1;
2593 /* Normal exit, no error */
2598 /* Cleanup reamaining connection object. */
2600 cds_lfht_for_each_entry(relay_connections_ht
->ht
, &iter
.iter
,
2603 health_code_update();
2605 * No need to grab another ref, because we own
2608 relay_thread_close_connection(&events
, destroy_conn
->sock
->fd
,
2613 lttng_poll_clean(&events
);
2615 lttng_ht_destroy(relay_connections_ht
);
2616 relay_connections_ht_error
:
2617 /* Close relay conn pipes */
2618 utils_close_pipe(relay_conn_pipe
);
2620 DBG("Thread exited with error");
2622 DBG("Worker thread cleanup complete");
2627 ERR("Health error occurred in %s", __func__
);
2629 health_unregister(health_relayd
);
2630 rcu_unregister_thread();
2631 lttng_relay_stop_threads();
2636 * Create the relay command pipe to wake thread_manage_apps.
2637 * Closed in cleanup().
2639 static int create_relay_conn_pipe(void)
2643 ret
= utils_create_pipe_cloexec(relay_conn_pipe
);
2651 int main(int argc
, char **argv
)
2653 int ret
= 0, retval
= 0;
2656 /* Parse arguments */
2658 if (set_options(argc
, argv
)) {
2663 if (set_signal_handler()) {
2668 /* Try to create directory if -o, --output is specified. */
2669 if (opt_output_path
) {
2670 if (*opt_output_path
!= '/') {
2671 ERR("Please specify an absolute path for -o, --output PATH");
2676 ret
= utils_mkdir_recursive(opt_output_path
, S_IRWXU
| S_IRWXG
,
2679 ERR("Unable to create %s", opt_output_path
);
2686 if (opt_daemon
|| opt_background
) {
2689 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
2697 * We are in the child. Make sure all other file
2698 * descriptors are closed, in case we are called with
2699 * more opened file descriptors than the standard ones.
2701 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
2707 /* Initialize thread health monitoring */
2708 health_relayd
= health_app_create(NR_HEALTH_RELAYD_TYPES
);
2709 if (!health_relayd
) {
2710 PERROR("health_app_create error");
2712 goto exit_health_app_create
;
2715 /* Create thread quit pipe */
2716 if (init_thread_quit_pipe()) {
2718 goto exit_init_data
;
2721 /* Check if daemon is UID = 0 */
2723 if (control_uri
->port
< 1024 || data_uri
->port
< 1024 || live_uri
->port
< 1024) {
2724 ERR("Need to be root to use ports < 1024");
2726 goto exit_init_data
;
2730 /* Setup the thread apps communication pipe. */
2731 if (create_relay_conn_pipe()) {
2733 goto exit_init_data
;
2736 /* Init relay command queue. */
2737 cds_wfcq_init(&relay_conn_queue
.head
, &relay_conn_queue
.tail
);
2739 /* Set up max poll set size */
2740 if (lttng_poll_set_max_size()) {
2742 goto exit_init_data
;
2745 /* Initialize communication library */
2747 lttcomm_inet_init();
2749 /* tables of sessions indexed by session ID */
2750 sessions_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2753 goto exit_init_data
;
2756 /* tables of streams indexed by stream ID */
2757 relay_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2758 if (!relay_streams_ht
) {
2760 goto exit_init_data
;
2763 /* tables of streams indexed by stream ID */
2764 viewer_streams_ht
= lttng_ht_new(0, LTTNG_HT_TYPE_U64
);
2765 if (!viewer_streams_ht
) {
2767 goto exit_init_data
;
2770 ret
= utils_create_pipe(health_quit_pipe
);
2773 goto exit_health_quit_pipe
;
2776 /* Create thread to manage the client socket */
2777 ret
= pthread_create(&health_thread
, NULL
,
2778 thread_manage_health
, (void *) NULL
);
2781 PERROR("pthread_create health");
2783 goto exit_health_thread
;
2786 /* Setup the dispatcher thread */
2787 ret
= pthread_create(&dispatcher_thread
, NULL
,
2788 relay_thread_dispatcher
, (void *) NULL
);
2791 PERROR("pthread_create dispatcher");
2793 goto exit_dispatcher_thread
;
2796 /* Setup the worker thread */
2797 ret
= pthread_create(&worker_thread
, NULL
,
2798 relay_thread_worker
, NULL
);
2801 PERROR("pthread_create worker");
2803 goto exit_worker_thread
;
2806 /* Setup the listener thread */
2807 ret
= pthread_create(&listener_thread
, NULL
,
2808 relay_thread_listener
, (void *) NULL
);
2811 PERROR("pthread_create listener");
2813 goto exit_listener_thread
;
2816 ret
= relayd_live_create(live_uri
);
2818 ERR("Starting live viewer threads");
2824 * This is where we start awaiting program completion (e.g. through
2825 * signal that asks threads to teardown).
2828 ret
= relayd_live_join();
2834 ret
= pthread_join(listener_thread
, &status
);
2837 PERROR("pthread_join listener_thread");
2841 exit_listener_thread
:
2842 ret
= pthread_join(worker_thread
, &status
);
2845 PERROR("pthread_join worker_thread");
2850 ret
= pthread_join(dispatcher_thread
, &status
);
2853 PERROR("pthread_join dispatcher_thread");
2856 exit_dispatcher_thread
:
2858 ret
= pthread_join(health_thread
, &status
);
2861 PERROR("pthread_join health_thread");
2866 utils_close_pipe(health_quit_pipe
);
2867 exit_health_quit_pipe
:
2870 health_app_destroy(health_relayd
);
2871 exit_health_app_create
:
2875 /* Ensure all prior call_rcu are done. */