2 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
3 * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * SPDX-License-Identifier: GPL-2.0-only
22 #include <sys/mount.h>
23 #include <sys/resource.h>
24 #include <sys/socket.h>
26 #include <sys/types.h>
28 #include <urcu/uatomic.h>
32 #include <common/common.h>
33 #include <common/compat/socket.h>
34 #include <common/compat/getenv.h>
35 #include <common/defaults.h>
36 #include <common/kernel-consumer/kernel-consumer.h>
37 #include <common/futex.h>
38 #include <common/relayd/relayd.h>
39 #include <common/utils.h>
40 #include <common/daemonize.h>
41 #include <common/config/session-config.h>
42 #include <common/dynamic-buffer.h>
43 #include <lttng/event-internal.h>
45 #include "lttng-sessiond.h"
46 #include "buffer-registry.h"
52 #include "event-notifier-error-accounting.h"
54 #include "kernel-consumer.h"
55 #include "lttng-ust-ctl.h"
56 #include "ust-consumer.h"
59 #include "health-sessiond.h"
60 #include "testpoint.h"
61 #include "notify-apps.h"
62 #include "agent-thread.h"
64 #include "notification-thread.h"
65 #include "notification-thread-commands.h"
66 #include "rotation-thread.h"
68 #include "ht-cleanup.h"
69 #include "sessiond-config.h"
75 #include "manage-apps.h"
76 #include "manage-kernel.h"
79 static const char *help_msg
=
80 #ifdef LTTNG_EMBED_HELP
81 #include <lttng-sessiond.8.h>
87 #define EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX 65535
88 #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR \
89 "event-notifier-error-buffer-size"
90 #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR \
91 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-kernel"
92 #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR \
93 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-userspace"
97 static int lockfile_fd
= -1;
98 static int opt_print_version
;
100 /* Set to 1 when a SIGUSR1 signal is received. */
101 static int recv_child_signal
;
103 /* Command line options */
104 static const struct option long_options
[] = {
105 { "client-sock", required_argument
, 0, 'c' },
106 { "apps-sock", required_argument
, 0, 'a' },
107 { "kconsumerd-cmd-sock", required_argument
, 0, '\0' },
108 { "kconsumerd-err-sock", required_argument
, 0, '\0' },
109 { "ustconsumerd32-cmd-sock", required_argument
, 0, '\0' },
110 { "ustconsumerd32-err-sock", required_argument
, 0, '\0' },
111 { "ustconsumerd64-cmd-sock", required_argument
, 0, '\0' },
112 { "ustconsumerd64-err-sock", required_argument
, 0, '\0' },
113 { "consumerd32-path", required_argument
, 0, '\0' },
114 { "consumerd32-libdir", required_argument
, 0, '\0' },
115 { "consumerd64-path", required_argument
, 0, '\0' },
116 { "consumerd64-libdir", required_argument
, 0, '\0' },
117 { "daemonize", no_argument
, 0, 'd' },
118 { "background", no_argument
, 0, 'b' },
119 { "sig-parent", no_argument
, 0, 'S' },
120 { "help", no_argument
, 0, 'h' },
121 { "group", required_argument
, 0, 'g' },
122 { "version", no_argument
, 0, 'V' },
123 { "quiet", no_argument
, 0, 'q' },
124 { "verbose", no_argument
, 0, 'v' },
125 { "verbose-consumer", no_argument
, 0, '\0' },
126 { "no-kernel", no_argument
, 0, '\0' },
127 { "pidfile", required_argument
, 0, 'p' },
128 { "agent-tcp-port", required_argument
, 0, '\0' },
129 { "config", required_argument
, 0, 'f' },
130 { "load", required_argument
, 0, 'l' },
131 { "kmod-probes", required_argument
, 0, '\0' },
132 { "extra-kmod-probes", required_argument
, 0, '\0' },
133 { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR
, required_argument
, 0, '\0' },
134 { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR
, required_argument
, 0, '\0' },
138 /* Command line options to ignore from configuration file */
139 static const char *config_ignore_options
[] = { "help", "version", "config" };
142 * This pipe is used to inform the thread managing application communication
143 * that a command is queued and ready to be processed.
145 static int apps_cmd_pipe
[2] = { -1, -1 };
146 static int apps_cmd_notify_pipe
[2] = { -1, -1 };
149 * UST registration command queue. This queue is tied with a futex and uses a N
150 * wakers / 1 waiter implemented and detailed in futex.c/.h
152 * The thread_registration_apps and thread_dispatch_ust_registration uses this
153 * queue along with the wait/wake scheme. The thread_manage_apps receives down
154 * the line new application socket and monitors it for any I/O error or clean
155 * close that triggers an unregistration of the application.
157 static struct ust_cmd_queue ust_cmd_queue
;
160 * Section name to look for in the daemon configuration file.
162 static const char * const config_section_name
= "sessiond";
164 /* Am I root or not. Set to 1 if the daemon is running as root */
168 * Stop all threads by closing the thread quit pipe.
170 static void stop_threads(void)
174 /* Stopping all threads */
175 DBG("Terminating all threads");
176 ret
= sessiond_notify_quit_pipe();
178 ERR("write error on thread quit pipe");
183 * Close every consumer sockets.
185 static void close_consumer_sockets(void)
189 if (the_kconsumer_data
.err_sock
>= 0) {
190 ret
= close(the_kconsumer_data
.err_sock
);
192 PERROR("kernel consumer err_sock close");
195 if (the_ustconsumer32_data
.err_sock
>= 0) {
196 ret
= close(the_ustconsumer32_data
.err_sock
);
198 PERROR("UST consumerd32 err_sock close");
201 if (the_ustconsumer64_data
.err_sock
>= 0) {
202 ret
= close(the_ustconsumer64_data
.err_sock
);
204 PERROR("UST consumerd64 err_sock close");
207 if (the_kconsumer_data
.cmd_sock
>= 0) {
208 ret
= close(the_kconsumer_data
.cmd_sock
);
210 PERROR("kernel consumer cmd_sock close");
213 if (the_ustconsumer32_data
.cmd_sock
>= 0) {
214 ret
= close(the_ustconsumer32_data
.cmd_sock
);
216 PERROR("UST consumerd32 cmd_sock close");
219 if (the_ustconsumer64_data
.cmd_sock
>= 0) {
220 ret
= close(the_ustconsumer64_data
.cmd_sock
);
222 PERROR("UST consumerd64 cmd_sock close");
225 if (the_kconsumer_data
.channel_monitor_pipe
>= 0) {
226 ret
= close(the_kconsumer_data
.channel_monitor_pipe
);
228 PERROR("kernel consumer channel monitor pipe close");
231 if (the_ustconsumer32_data
.channel_monitor_pipe
>= 0) {
232 ret
= close(the_ustconsumer32_data
.channel_monitor_pipe
);
234 PERROR("UST consumerd32 channel monitor pipe close");
237 if (the_ustconsumer64_data
.channel_monitor_pipe
>= 0) {
238 ret
= close(the_ustconsumer64_data
.channel_monitor_pipe
);
240 PERROR("UST consumerd64 channel monitor pipe close");
246 * Wait on consumer process termination.
248 * Need to be called with the consumer data lock held or from a context
249 * ensuring no concurrent access to data (e.g: cleanup).
251 static void wait_consumer(struct consumer_data
*consumer_data
)
256 if (consumer_data
->pid
<= 0) {
260 DBG("Waiting for complete teardown of consumerd (PID: %d)",
262 ret
= waitpid(consumer_data
->pid
, &status
, 0);
264 PERROR("consumerd waitpid pid: %d", consumer_data
->pid
)
265 } else if (!WIFEXITED(status
)) {
266 ERR("consumerd termination with error: %d",
269 consumer_data
->pid
= 0;
273 * Cleanup the session daemon's data structures.
275 static void sessiond_cleanup(void)
278 struct ltt_session_list
*session_list
= session_get_list();
280 DBG("Cleanup sessiond");
283 * Close the thread quit pipe. It has already done its job,
284 * since we are now called.
286 sessiond_close_quit_pipe();
287 utils_close_pipe(apps_cmd_pipe
);
288 utils_close_pipe(apps_cmd_notify_pipe
);
289 utils_close_pipe(the_kernel_poll_pipe
);
291 ret
= remove(the_config
.pid_file_path
.value
);
293 PERROR("remove pidfile %s", the_config
.pid_file_path
.value
);
296 DBG("Removing sessiond and consumerd content of directory %s",
297 the_config
.rundir
.value
);
300 DBG("Removing %s", the_config
.pid_file_path
.value
);
301 (void) unlink(the_config
.pid_file_path
.value
);
303 DBG("Removing %s", the_config
.agent_port_file_path
.value
);
304 (void) unlink(the_config
.agent_port_file_path
.value
);
307 DBG("Removing %s", the_kconsumer_data
.err_unix_sock_path
);
308 (void) unlink(the_kconsumer_data
.err_unix_sock_path
);
310 DBG("Removing directory %s", the_config
.kconsumerd_path
.value
);
311 (void) rmdir(the_config
.kconsumerd_path
.value
);
313 /* ust consumerd 32 */
314 DBG("Removing %s", the_config
.consumerd32_err_unix_sock_path
.value
);
315 (void) unlink(the_config
.consumerd32_err_unix_sock_path
.value
);
317 DBG("Removing directory %s", the_config
.consumerd32_path
.value
);
318 (void) rmdir(the_config
.consumerd32_path
.value
);
320 /* ust consumerd 64 */
321 DBG("Removing %s", the_config
.consumerd64_err_unix_sock_path
.value
);
322 (void) unlink(the_config
.consumerd64_err_unix_sock_path
.value
);
324 DBG("Removing directory %s", the_config
.consumerd64_path
.value
);
325 (void) rmdir(the_config
.consumerd64_path
.value
);
327 pthread_mutex_destroy(&session_list
->lock
);
329 DBG("Cleaning up all per-event notifier domain agents");
330 agent_by_event_notifier_domain_ht_destroy();
332 DBG("Cleaning up all agent apps");
333 agent_app_ht_clean();
334 DBG("Closing all UST sockets");
335 ust_app_clean_list();
336 buffer_reg_destroy_registries();
338 close_consumer_sockets();
340 wait_consumer(&the_kconsumer_data
);
341 wait_consumer(&the_ustconsumer64_data
);
342 wait_consumer(&the_ustconsumer32_data
);
344 if (is_root
&& !the_config
.no_kernel
) {
345 cleanup_kernel_tracer();
349 * We do NOT rmdir rundir because there are other processes
350 * using it, for instance lttng-relayd, which can start in
351 * parallel with this teardown.
356 * Cleanup the daemon's option data structures.
358 static void sessiond_cleanup_options(void)
360 DBG("Cleaning up options");
362 sessiond_config_fini(&the_config
);
364 run_as_destroy_worker();
367 static int string_match(const char *str1
, const char *str2
)
369 return (str1
&& str2
) && !strcmp(str1
, str2
);
373 * Take an option from the getopt output and set it in the right variable to be
376 * Return 0 on success else a negative value.
378 static int set_option(int opt
, const char *arg
, const char *optname
)
382 if (string_match(optname
, "client-sock") || opt
== 'c') {
383 if (!arg
|| *arg
== '\0') {
387 if (lttng_is_setuid_setgid()) {
388 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
389 "-c, --client-sock");
391 config_string_set(&the_config
.client_unix_sock_path
,
393 if (!the_config
.client_unix_sock_path
.value
) {
398 } else if (string_match(optname
, "apps-sock") || opt
== 'a') {
399 if (!arg
|| *arg
== '\0') {
403 if (lttng_is_setuid_setgid()) {
404 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
407 config_string_set(&the_config
.apps_unix_sock_path
,
409 if (!the_config
.apps_unix_sock_path
.value
) {
414 } else if (string_match(optname
, "daemonize") || opt
== 'd') {
415 the_config
.daemonize
= true;
416 } else if (string_match(optname
, "background") || opt
== 'b') {
417 the_config
.background
= true;
418 } else if (string_match(optname
, "group") || opt
== 'g') {
419 if (!arg
|| *arg
== '\0') {
423 if (lttng_is_setuid_setgid()) {
424 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
427 config_string_set(&the_config
.tracing_group_name
,
429 if (!the_config
.tracing_group_name
.value
) {
434 } else if (string_match(optname
, "help") || opt
== 'h') {
435 ret
= utils_show_help(8, "lttng-sessiond", help_msg
);
437 ERR("Cannot show --help for `lttng-sessiond`");
440 exit(ret
? EXIT_FAILURE
: EXIT_SUCCESS
);
441 } else if (string_match(optname
, "version") || opt
== 'V') {
442 opt_print_version
= 1;
443 } else if (string_match(optname
, "sig-parent") || opt
== 'S') {
444 the_config
.sig_parent
= true;
445 } else if (string_match(optname
, "kconsumerd-err-sock")) {
446 if (!arg
|| *arg
== '\0') {
450 if (lttng_is_setuid_setgid()) {
451 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
452 "--kconsumerd-err-sock");
455 &the_config
.kconsumerd_err_unix_sock_path
,
457 if (!the_config
.kconsumerd_err_unix_sock_path
.value
) {
462 } else if (string_match(optname
, "kconsumerd-cmd-sock")) {
463 if (!arg
|| *arg
== '\0') {
467 if (lttng_is_setuid_setgid()) {
468 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
469 "--kconsumerd-cmd-sock");
472 &the_config
.kconsumerd_cmd_unix_sock_path
,
474 if (!the_config
.kconsumerd_cmd_unix_sock_path
.value
) {
479 } else if (string_match(optname
, "ustconsumerd64-err-sock")) {
480 if (!arg
|| *arg
== '\0') {
484 if (lttng_is_setuid_setgid()) {
485 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
486 "--ustconsumerd64-err-sock");
489 &the_config
.consumerd64_err_unix_sock_path
,
491 if (!the_config
.consumerd64_err_unix_sock_path
.value
) {
496 } else if (string_match(optname
, "ustconsumerd64-cmd-sock")) {
497 if (!arg
|| *arg
== '\0') {
501 if (lttng_is_setuid_setgid()) {
502 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
503 "--ustconsumerd64-cmd-sock");
506 &the_config
.consumerd64_cmd_unix_sock_path
,
508 if (!the_config
.consumerd64_cmd_unix_sock_path
.value
) {
513 } else if (string_match(optname
, "ustconsumerd32-err-sock")) {
514 if (!arg
|| *arg
== '\0') {
518 if (lttng_is_setuid_setgid()) {
519 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
520 "--ustconsumerd32-err-sock");
523 &the_config
.consumerd32_err_unix_sock_path
,
525 if (!the_config
.consumerd32_err_unix_sock_path
.value
) {
530 } else if (string_match(optname
, "ustconsumerd32-cmd-sock")) {
531 if (!arg
|| *arg
== '\0') {
535 if (lttng_is_setuid_setgid()) {
536 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
537 "--ustconsumerd32-cmd-sock");
540 &the_config
.consumerd32_cmd_unix_sock_path
,
542 if (!the_config
.consumerd32_cmd_unix_sock_path
.value
) {
547 } else if (string_match(optname
, "no-kernel")) {
548 the_config
.no_kernel
= true;
549 } else if (string_match(optname
, "quiet") || opt
== 'q') {
550 the_config
.quiet
= true;
551 } else if (string_match(optname
, "verbose") || opt
== 'v') {
552 /* Verbose level can increase using multiple -v */
554 /* Value obtained from config file */
555 the_config
.verbose
= config_parse_value(arg
);
557 /* -v used on command line */
558 the_config
.verbose
++;
560 /* Clamp value to [0, 3] */
561 the_config
.verbose
= the_config
.verbose
< 0 ?
563 (the_config
.verbose
<= 3 ? the_config
.verbose
:
565 } else if (string_match(optname
, "verbose-consumer")) {
567 the_config
.verbose_consumer
= config_parse_value(arg
);
569 the_config
.verbose_consumer
++;
571 } else if (string_match(optname
, "consumerd32-path")) {
572 if (!arg
|| *arg
== '\0') {
576 if (lttng_is_setuid_setgid()) {
577 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
578 "--consumerd32-path");
580 config_string_set(&the_config
.consumerd32_bin_path
,
582 if (!the_config
.consumerd32_bin_path
.value
) {
587 } else if (string_match(optname
, "consumerd32-libdir")) {
588 if (!arg
|| *arg
== '\0') {
592 if (lttng_is_setuid_setgid()) {
593 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
594 "--consumerd32-libdir");
596 config_string_set(&the_config
.consumerd32_lib_dir
,
598 if (!the_config
.consumerd32_lib_dir
.value
) {
603 } else if (string_match(optname
, "consumerd64-path")) {
604 if (!arg
|| *arg
== '\0') {
608 if (lttng_is_setuid_setgid()) {
609 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
610 "--consumerd64-path");
612 config_string_set(&the_config
.consumerd64_bin_path
,
614 if (!the_config
.consumerd64_bin_path
.value
) {
619 } else if (string_match(optname
, "consumerd64-libdir")) {
620 if (!arg
|| *arg
== '\0') {
624 if (lttng_is_setuid_setgid()) {
625 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
626 "--consumerd64-libdir");
628 config_string_set(&the_config
.consumerd64_lib_dir
,
630 if (!the_config
.consumerd64_lib_dir
.value
) {
635 } else if (string_match(optname
, "pidfile") || opt
== 'p') {
636 if (!arg
|| *arg
== '\0') {
640 if (lttng_is_setuid_setgid()) {
641 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
645 &the_config
.pid_file_path
, strdup(arg
));
646 if (!the_config
.pid_file_path
.value
) {
651 } else if (string_match(optname
, "agent-tcp-port")) {
652 if (!arg
|| *arg
== '\0') {
656 if (lttng_is_setuid_setgid()) {
657 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
663 v
= strtoul(arg
, NULL
, 0);
664 if (errno
!= 0 || !isdigit(arg
[0])) {
665 ERR("Wrong value in --agent-tcp-port parameter: %s", arg
);
668 if (v
== 0 || v
>= 65535) {
669 ERR("Port overflow in --agent-tcp-port parameter: %s", arg
);
672 the_config
.agent_tcp_port
.begin
=
673 the_config
.agent_tcp_port
.end
= (int) v
;
674 DBG3("Agent TCP port set to non default: %i", (int) v
);
676 } else if (string_match(optname
, "load") || opt
== 'l') {
677 if (!arg
|| *arg
== '\0') {
681 if (lttng_is_setuid_setgid()) {
682 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
685 config_string_set(&the_config
.load_session_path
,
687 if (!the_config
.load_session_path
.value
) {
692 } else if (string_match(optname
, "kmod-probes")) {
693 if (!arg
|| *arg
== '\0') {
697 if (lttng_is_setuid_setgid()) {
698 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
701 config_string_set(&the_config
.kmod_probes_list
,
703 if (!the_config
.kmod_probes_list
.value
) {
708 } else if (string_match(optname
, "extra-kmod-probes")) {
709 if (!arg
|| *arg
== '\0') {
713 if (lttng_is_setuid_setgid()) {
714 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
715 "--extra-kmod-probes");
717 config_string_set(&the_config
.kmod_extra_probes_list
,
719 if (!the_config
.kmod_extra_probes_list
.value
) {
724 } else if (string_match(optname
, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR
)) {
728 v
= strtoul(arg
, NULL
, 0);
729 if (errno
!= 0 || !isdigit(arg
[0])) {
730 ERR("Wrong value in --%s parameter: %s",
731 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR
, arg
);
734 if (v
== 0 || v
>= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX
) {
735 ERR("Value out of range for --%s parameter: %s",
736 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR
, arg
);
739 the_config
.event_notifier_buffer_size_kernel
= (int) v
;
740 DBG3("Number of event notifier error buffer kernel size to non default: %i",
741 the_config
.event_notifier_buffer_size_kernel
);
743 } else if (string_match(optname
, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR
)) {
747 v
= strtoul(arg
, NULL
, 0);
748 if (errno
!= 0 || !isdigit(arg
[0])) {
749 ERR("Wrong value in --%s parameter: %s",
750 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR
, arg
);
753 if (v
== 0 || v
>= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX
) {
754 ERR("Value out of range for --%s parameter: %s",
755 EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR
, arg
);
758 the_config
.event_notifier_buffer_size_userspace
= (int) v
;
759 DBG3("Number of event notifier error buffer userspace size to non default: %i",
760 the_config
.event_notifier_buffer_size_userspace
);
762 } else if (string_match(optname
, "config") || opt
== 'f') {
763 /* This is handled in set_options() thus silent skip. */
766 /* Unknown option or other error.
767 * Error is printed by getopt, just return */
772 if (ret
== -EINVAL
) {
773 const char *opt_name
= "unknown";
776 for (i
= 0; i
< sizeof(long_options
) / sizeof(struct option
);
778 if (opt
== long_options
[i
].val
) {
779 opt_name
= long_options
[i
].name
;
784 WARN("Invalid argument provided for option \"%s\", using default value.",
792 * config_entry_handler_cb used to handle options read from a config file.
793 * See config_entry_handler_cb comment in common/config/session-config.h for the
794 * return value conventions.
796 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
800 if (!entry
|| !entry
->name
|| !entry
->value
) {
805 /* Check if the option is to be ignored */
806 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
807 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
812 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1;
815 /* Ignore if not fully matched. */
816 if (strcmp(entry
->name
, long_options
[i
].name
)) {
821 * If the option takes no argument on the command line, we have to
822 * check if the value is "true". We support non-zero numeric values,
825 if (!long_options
[i
].has_arg
) {
826 ret
= config_parse_value(entry
->value
);
829 WARN("Invalid configuration value \"%s\" for option %s",
830 entry
->value
, entry
->name
);
832 /* False, skip boolean config option. */
837 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
841 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry
->name
);
847 static void print_version(void) {
848 fprintf(stdout
, "%s\n", VERSION
);
852 * daemon configuration loading and argument parsing
854 static int set_options(int argc
, char **argv
)
856 int ret
= 0, c
= 0, option_index
= 0;
857 int orig_optopt
= optopt
, orig_optind
= optind
;
859 const char *config_path
= NULL
;
861 optstring
= utils_generate_optstring(long_options
,
862 sizeof(long_options
) / sizeof(struct option
));
868 /* Check for the --config option */
869 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
870 &option_index
)) != -1) {
874 } else if (c
!= 'f') {
875 /* if not equal to --config option. */
879 if (lttng_is_setuid_setgid()) {
880 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
883 config_path
= utils_expand_path(optarg
);
885 ERR("Failed to resolve path: %s", optarg
);
890 ret
= config_get_section_entries(config_path
, config_section_name
,
891 config_entry_handler
, NULL
);
894 ERR("Invalid configuration option at line %i", ret
);
900 /* Reset getopt's global state */
901 optopt
= orig_optopt
;
902 optind
= orig_optind
;
906 * getopt_long() will not set option_index if it encounters a
909 c
= getopt_long(argc
, argv
, optstring
, long_options
,
916 * Pass NULL as the long option name if popt left the index
919 ret
= set_option(c
, optarg
,
920 option_index
< 0 ? NULL
:
921 long_options
[option_index
].name
);
933 * Create lockfile using the rundir and return its fd.
935 static int create_lockfile(void)
937 return utils_create_lock_file(the_config
.lock_file_path
.value
);
941 * Check if the global socket is available, and if a daemon is answering at the
942 * other side. If yes, error is returned.
944 * Also attempts to create and hold the lock file.
946 static int check_existing_daemon(void)
950 /* Is there anybody out there ? */
951 if (lttng_session_daemon_alive()) {
956 lockfile_fd
= create_lockfile();
957 if (lockfile_fd
< 0) {
965 static void sessiond_cleanup_lock_file(void)
970 * Cleanup lock file by deleting it and finaly closing it which will
971 * release the file system lock.
973 if (lockfile_fd
>= 0) {
974 ret
= remove(the_config
.lock_file_path
.value
);
976 PERROR("remove lock file");
978 ret
= close(lockfile_fd
);
980 PERROR("close lock file");
986 * Set the tracing group gid onto the client socket.
988 * Race window between mkdir and chown is OK because we are going from more
989 * permissive (root.root) to less permissive (root.tracing).
991 static int set_permissions(char *rundir
)
996 ret
= utils_get_group_id(
997 the_config
.tracing_group_name
.value
, true, &gid
);
999 /* Default to root group. */
1003 /* Set lttng run dir */
1004 ret
= chown(rundir
, 0, gid
);
1006 ERR("Unable to set group on %s", rundir
);
1011 * Ensure all applications and tracing group can search the run
1012 * dir. Allow everyone to read the directory, since it does not
1013 * buy us anything to hide its content.
1015 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
1017 ERR("Unable to set permissions on %s", rundir
);
1021 /* lttng client socket path */
1022 ret
= chown(the_config
.client_unix_sock_path
.value
, 0, gid
);
1024 ERR("Unable to set group on %s",
1025 the_config
.client_unix_sock_path
.value
);
1029 /* kconsumer error socket path */
1030 ret
= chown(the_kconsumer_data
.err_unix_sock_path
, 0, 0);
1032 ERR("Unable to set group on %s",
1033 the_kconsumer_data
.err_unix_sock_path
);
1037 /* 64-bit ustconsumer error socket path */
1038 ret
= chown(the_ustconsumer64_data
.err_unix_sock_path
, 0, 0);
1040 ERR("Unable to set group on %s",
1041 the_ustconsumer64_data
.err_unix_sock_path
);
1045 /* 32-bit ustconsumer compat32 error socket path */
1046 ret
= chown(the_ustconsumer32_data
.err_unix_sock_path
, 0, 0);
1048 ERR("Unable to set group on %s",
1049 the_ustconsumer32_data
.err_unix_sock_path
);
1053 DBG("All permissions are set");
1059 * Create the lttng run directory needed for all global sockets and pipe.
1061 static int create_lttng_rundir(void)
1065 DBG3("Creating LTTng run directory: %s", the_config
.rundir
.value
);
1067 ret
= mkdir(the_config
.rundir
.value
, S_IRWXU
);
1069 if (errno
!= EEXIST
) {
1070 ERR("Unable to create %s", the_config
.rundir
.value
);
1082 * Setup sockets and directory needed by the consumerds' communication with the
1085 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
1090 switch (consumer_data
->type
) {
1091 case LTTNG_CONSUMER_KERNEL
:
1092 path
= the_config
.kconsumerd_path
.value
;
1094 case LTTNG_CONSUMER64_UST
:
1095 path
= the_config
.consumerd64_path
.value
;
1097 case LTTNG_CONSUMER32_UST
:
1098 path
= the_config
.consumerd32_path
.value
;
1101 ERR("Consumer type unknown");
1107 DBG2("Creating consumer directory: %s", path
);
1109 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
1110 if (ret
< 0 && errno
!= EEXIST
) {
1112 ERR("Failed to create %s", path
);
1118 ret
= utils_get_group_id(the_config
.tracing_group_name
.value
,
1121 /* Default to root group. */
1125 ret
= chown(path
, 0, gid
);
1127 ERR("Unable to set group on %s", path
);
1133 /* Create the consumerd error unix socket */
1134 consumer_data
->err_sock
=
1135 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
1136 if (consumer_data
->err_sock
< 0) {
1137 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
1143 * Set the CLOEXEC flag. Return code is useless because either way, the
1146 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
1148 PERROR("utils_set_fd_cloexec");
1149 /* continue anyway */
1152 /* File permission MUST be 660 */
1153 ret
= chmod(consumer_data
->err_unix_sock_path
,
1154 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
1156 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
1166 * Signal handler for the daemon
1168 * Simply stop all worker threads, leaving main() return gracefully after
1169 * joining all threads and calling cleanup().
1171 static void sighandler(int sig
)
1175 DBG("SIGINT caught");
1179 DBG("SIGTERM caught");
1183 CMM_STORE_SHARED(recv_child_signal
, 1);
1191 * Setup signal handler for :
1192 * SIGINT, SIGTERM, SIGPIPE
1194 static int set_signal_handler(void)
1197 struct sigaction sa
;
1200 if ((ret
= sigemptyset(&sigset
)) < 0) {
1201 PERROR("sigemptyset");
1205 sa
.sa_mask
= sigset
;
1208 sa
.sa_handler
= sighandler
;
1209 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
1210 PERROR("sigaction");
1214 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
1215 PERROR("sigaction");
1219 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
1220 PERROR("sigaction");
1224 sa
.sa_handler
= SIG_IGN
;
1225 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
1226 PERROR("sigaction");
1230 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
1236 * Set open files limit to unlimited. This daemon can open a large number of
1237 * file descriptors in order to consume multiple kernel traces.
1239 static void set_ulimit(void)
1244 /* The kernel does not allow an infinite limit for open files */
1245 lim
.rlim_cur
= 65535;
1246 lim
.rlim_max
= 65535;
1248 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
1250 PERROR("failed to set open files limit");
1254 static int write_pidfile(void)
1256 return utils_create_pid_file(getpid(), the_config
.pid_file_path
.value
);
1259 static int set_clock_plugin_env(void)
1262 char *env_value
= NULL
;
1264 if (!the_config
.lttng_ust_clock_plugin
.value
) {
1268 ret
= asprintf(&env_value
, "LTTNG_UST_CLOCK_PLUGIN=%s",
1269 the_config
.lttng_ust_clock_plugin
.value
);
1275 ret
= putenv(env_value
);
1278 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
1282 DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
1283 the_config
.lttng_ust_clock_plugin
.value
);
1288 static void destroy_all_sessions_and_wait(void)
1290 struct ltt_session
*session
, *tmp
;
1291 struct ltt_session_list
*session_list
;
1293 session_list
= session_get_list();
1294 DBG("Initiating destruction of all sessions");
1296 if (!session_list
) {
1300 session_lock_list();
1301 /* Initiate the destruction of all sessions. */
1302 cds_list_for_each_entry_safe(session
, tmp
,
1303 &session_list
->head
, list
) {
1304 if (!session_get(session
)) {
1308 session_lock(session
);
1309 if (session
->destroyed
) {
1310 goto unlock_session
;
1312 (void) cmd_stop_trace(session
);
1313 (void) cmd_destroy_session(
1314 session
, the_notification_thread_handle
, NULL
);
1316 session_unlock(session
);
1317 session_put(session
);
1319 session_unlock_list();
1321 /* Wait for the destruction of all sessions to complete. */
1322 DBG("Waiting for the destruction of all sessions to complete");
1323 session_list_wait_empty();
1324 DBG("Destruction of all sessions completed");
1327 static void unregister_all_triggers(void)
1329 enum lttng_error_code ret_code
;
1330 enum lttng_trigger_status trigger_status
;
1331 struct lttng_triggers
*triggers
= NULL
;
1332 unsigned int trigger_count
, i
;
1333 const struct lttng_credentials creds
= {
1334 .uid
= LTTNG_OPTIONAL_INIT_VALUE(0),
1337 DBG("Unregistering all triggers");
1340 * List all triggers as "root" since we wish to unregister all triggers.
1342 ret_code
= notification_thread_command_list_triggers(
1343 the_notification_thread_handle
, creds
.uid
.value
,
1345 if (ret_code
!= LTTNG_OK
) {
1346 ERR("Failed to list triggers while unregistering all triggers");
1350 trigger_status
= lttng_triggers_get_count(triggers
, &trigger_count
);
1351 assert(trigger_status
== LTTNG_TRIGGER_STATUS_OK
);
1353 for (i
= 0; i
< trigger_count
; i
++) {
1354 uid_t trigger_owner
;
1355 const char *trigger_name
;
1356 const struct lttng_trigger
*trigger
=
1357 lttng_triggers_get_at_index(triggers
, i
);
1361 trigger_status
= lttng_trigger_get_owner_uid(
1362 trigger
, &trigger_owner
);
1363 assert(trigger_status
== LTTNG_TRIGGER_STATUS_OK
);
1365 trigger_status
= lttng_trigger_get_name(trigger
, &trigger_name
);
1366 trigger_name
= trigger_status
== LTTNG_TRIGGER_STATUS_OK
?
1367 trigger_name
: "(anonymous)";
1369 DBG("Unregistering trigger: trigger owner uid = %d, trigger name = '%s'",
1370 (int) trigger_owner
, trigger_name
);
1372 ret_code
= cmd_unregister_trigger(&creds
, trigger
,
1373 the_notification_thread_handle
);
1374 if (ret_code
!= LTTNG_OK
) {
1375 ERR("Failed to unregister trigger: trigger owner uid = %d, trigger name = '%s', error: '%s'",
1376 (int) trigger_owner
, trigger_name
,
1377 lttng_strerror(-ret_code
));
1378 /* Continue to unregister the remaining triggers. */
1382 lttng_triggers_destroy(triggers
);
1385 static int run_as_worker_post_fork_cleanup(void *data
)
1387 struct sessiond_config
*sessiond_config
= data
;
1389 sessiond_config_fini(sessiond_config
);
1393 static int launch_run_as_worker(const char *procname
)
1396 * Clean-up before forking the run-as worker. Any dynamically
1397 * allocated memory of which the worker is not aware will
1398 * be leaked as the process forks a run-as worker (and performs
1399 * no exec*()). The same would apply to any opened fd.
1401 return run_as_create_worker(
1402 procname
, run_as_worker_post_fork_cleanup
, &the_config
);
1405 static void sessiond_uuid_log(void)
1407 char uuid_str
[LTTNG_UUID_STR_LEN
];
1409 lttng_uuid_to_str(the_sessiond_uuid
, uuid_str
);
1410 DBG("Starting lttng-sessiond {%s}", uuid_str
);
1416 int main(int argc
, char **argv
)
1418 int ret
= 0, retval
= 0;
1419 const char *env_app_timeout
;
1420 struct lttng_pipe
*ust32_channel_monitor_pipe
= NULL
,
1421 *ust64_channel_monitor_pipe
= NULL
,
1422 *kernel_channel_monitor_pipe
= NULL
;
1423 struct lttng_thread
*ht_cleanup_thread
= NULL
;
1424 struct timer_thread_parameters timer_thread_parameters
;
1425 /* Rotation thread handle. */
1426 struct rotation_thread_handle
*rotation_thread_handle
= NULL
;
1427 /* Queue of rotation jobs populated by the sessiond-timer. */
1428 struct rotation_thread_timer_queue
*rotation_timer_queue
= NULL
;
1429 struct lttng_thread
*client_thread
= NULL
;
1430 struct lttng_thread
*notification_thread
= NULL
;
1431 struct lttng_thread
*register_apps_thread
= NULL
;
1432 enum event_notifier_error_accounting_status event_notifier_error_accounting_status
;
1434 logger_set_thread_name("Main", false);
1435 init_kernel_workarounds();
1437 rcu_register_thread();
1439 if (set_signal_handler()) {
1441 goto exit_set_signal_handler
;
1444 if (timer_signal_init()) {
1446 goto exit_set_signal_handler
;
1449 the_page_size
= sysconf(_SC_PAGESIZE
);
1450 if (the_page_size
< 0) {
1451 PERROR("sysconf _SC_PAGESIZE");
1452 the_page_size
= LONG_MAX
;
1453 WARN("Fallback page size to %ld", the_page_size
);
1456 ret
= sessiond_config_init(&the_config
);
1459 goto exit_set_signal_handler
;
1463 * Init config from environment variables.
1464 * Command line option override env configuration per-doc. Do env first.
1466 sessiond_config_apply_env_config(&the_config
);
1469 * Parse arguments and load the daemon configuration file.
1471 * We have an exit_options exit path to free memory reserved by
1472 * set_options. This is needed because the rest of sessiond_cleanup()
1473 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
1474 * depends on set_options.
1477 if (set_options(argc
, argv
)) {
1483 * Resolve all paths received as arguments, configuration option, or
1484 * through environment variable as absolute paths. This is necessary
1485 * since daemonizing causes the sessiond's current working directory
1488 ret
= sessiond_config_resolve_paths(&the_config
);
1494 lttng_opt_verbose
= the_config
.verbose
;
1495 lttng_opt_quiet
= the_config
.quiet
;
1496 the_kconsumer_data
.err_unix_sock_path
=
1497 the_config
.kconsumerd_err_unix_sock_path
.value
;
1498 the_kconsumer_data
.cmd_unix_sock_path
=
1499 the_config
.kconsumerd_cmd_unix_sock_path
.value
;
1500 the_ustconsumer32_data
.err_unix_sock_path
=
1501 the_config
.consumerd32_err_unix_sock_path
.value
;
1502 the_ustconsumer32_data
.cmd_unix_sock_path
=
1503 the_config
.consumerd32_cmd_unix_sock_path
.value
;
1504 the_ustconsumer64_data
.err_unix_sock_path
=
1505 the_config
.consumerd64_err_unix_sock_path
.value
;
1506 the_ustconsumer64_data
.cmd_unix_sock_path
=
1507 the_config
.consumerd64_cmd_unix_sock_path
.value
;
1508 set_clock_plugin_env();
1510 sessiond_config_log(&the_config
);
1511 sessiond_uuid_log();
1513 if (opt_print_version
) {
1519 if (create_lttng_rundir()) {
1524 /* Abort launch if a session daemon is already running. */
1525 if (check_existing_daemon()) {
1526 ERR("A session daemon is already running.");
1532 if (the_config
.daemonize
|| the_config
.background
) {
1535 ret
= lttng_daemonize(&the_child_ppid
, &recv_child_signal
,
1536 !the_config
.background
);
1543 * We are in the child. Make sure all other file descriptors are
1544 * closed, in case we are called with more opened file
1545 * descriptors than the standard ones and the lock file.
1547 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
1548 if (i
== lockfile_fd
) {
1555 if (launch_run_as_worker(argv
[0]) < 0) {
1556 goto exit_create_run_as_worker_cleanup
;
1560 * Starting from here, we can create threads. This needs to be after
1561 * lttng_daemonize due to RCU.
1565 * Initialize the health check subsystem. This call should set the
1566 * appropriate time values.
1568 the_health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
1569 if (!the_health_sessiond
) {
1570 PERROR("health_app_create error");
1575 /* Create thread to clean up RCU hash tables */
1576 ht_cleanup_thread
= launch_ht_cleanup_thread();
1577 if (!ht_cleanup_thread
) {
1582 /* Create thread quit pipe */
1583 if (sessiond_init_thread_quit_pipe()) {
1588 /* Check if daemon is UID = 0 */
1589 is_root
= !getuid();
1591 /* Create global run dir with root access */
1593 kernel_channel_monitor_pipe
= lttng_pipe_open(0);
1594 if (!kernel_channel_monitor_pipe
) {
1595 ERR("Failed to create kernel consumer channel monitor pipe");
1599 the_kconsumer_data
.channel_monitor_pipe
=
1600 lttng_pipe_release_writefd(
1601 kernel_channel_monitor_pipe
);
1602 if (the_kconsumer_data
.channel_monitor_pipe
< 0) {
1608 /* Set consumer initial state */
1609 the_kernel_consumerd_state
= CONSUMER_STOPPED
;
1610 the_ust_consumerd_state
= CONSUMER_STOPPED
;
1612 ust32_channel_monitor_pipe
= lttng_pipe_open(0);
1613 if (!ust32_channel_monitor_pipe
) {
1614 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
1618 the_ustconsumer32_data
.channel_monitor_pipe
=
1619 lttng_pipe_release_writefd(ust32_channel_monitor_pipe
);
1620 if (the_ustconsumer32_data
.channel_monitor_pipe
< 0) {
1626 * The rotation_thread_timer_queue structure is shared between the
1627 * sessiond timer thread and the rotation thread. The main thread keeps
1628 * its ownership and destroys it when both threads have been joined.
1630 rotation_timer_queue
= rotation_thread_timer_queue_create();
1631 if (!rotation_timer_queue
) {
1635 timer_thread_parameters
.rotation_thread_job_queue
=
1636 rotation_timer_queue
;
1638 ust64_channel_monitor_pipe
= lttng_pipe_open(0);
1639 if (!ust64_channel_monitor_pipe
) {
1640 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
1644 the_ustconsumer64_data
.channel_monitor_pipe
=
1645 lttng_pipe_release_writefd(ust64_channel_monitor_pipe
);
1646 if (the_ustconsumer64_data
.channel_monitor_pipe
< 0) {
1652 * Init UST app hash table. Alloc hash table before this point since
1653 * cleanup() can get called after that point.
1655 if (ust_app_ht_alloc()) {
1656 ERR("Failed to allocate UST app hash table");
1661 event_notifier_error_accounting_status
= event_notifier_error_accounting_init(
1662 the_config
.event_notifier_buffer_size_kernel
,
1663 the_config
.event_notifier_buffer_size_userspace
);
1664 if (event_notifier_error_accounting_status
!= EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK
) {
1665 ERR("Failed to initialize event notifier error accounting system");
1671 * Initialize agent app hash table. We allocate the hash table here
1672 * since cleanup() can get called after this point.
1674 if (agent_app_ht_alloc()) {
1675 ERR("Failed to allocate Agent app hash table");
1680 if (agent_by_event_notifier_domain_ht_create()) {
1681 ERR("Failed to allocate per-event notifier domain agent hash table");
1686 * These actions must be executed as root. We do that *after* setting up
1687 * the sockets path because we MUST make the check for another daemon using
1688 * those paths *before* trying to set the kernel consumer sockets and init
1692 if (set_consumer_sockets(&the_kconsumer_data
)) {
1697 /* Setup kernel tracer */
1698 if (!the_config
.no_kernel
) {
1699 init_kernel_tracer();
1702 /* Set ulimit for open files */
1705 /* init lttng_fd tracking must be done after set_ulimit. */
1708 if (set_consumer_sockets(&the_ustconsumer64_data
)) {
1713 if (set_consumer_sockets(&the_ustconsumer32_data
)) {
1718 /* Get parent pid if -S, --sig-parent is specified. */
1719 if (the_config
.sig_parent
) {
1720 the_ppid
= getppid();
1723 /* Setup the kernel pipe for waking up the kernel thread */
1724 if (is_root
&& !the_config
.no_kernel
) {
1725 if (utils_create_pipe_cloexec(the_kernel_poll_pipe
)) {
1731 /* Setup the thread apps communication pipe. */
1732 if (utils_create_pipe_cloexec(apps_cmd_pipe
)) {
1737 /* Setup the thread apps notify communication pipe. */
1738 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
)) {
1743 /* Initialize global buffer per UID and PID registry. */
1744 buffer_reg_init_uid_registry();
1745 buffer_reg_init_pid_registry();
1747 /* Init UST command queue. */
1748 cds_wfcq_init(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1752 /* Check for the application socket timeout env variable. */
1753 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
1754 if (env_app_timeout
) {
1755 the_config
.app_socket_timeout
= atoi(env_app_timeout
);
1757 the_config
.app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
1760 ret
= write_pidfile();
1762 ERR("Error in write_pidfile");
1767 /* Initialize communication library */
1769 /* Initialize TCP timeout values */
1770 lttcomm_inet_init();
1772 /* Create health-check thread. */
1773 if (!launch_health_management_thread()) {
1778 /* notification_thread_data acquires the pipes' read side. */
1779 the_notification_thread_handle
= notification_thread_handle_create(
1780 ust32_channel_monitor_pipe
, ust64_channel_monitor_pipe
,
1781 kernel_channel_monitor_pipe
);
1782 if (!the_notification_thread_handle
) {
1784 ERR("Failed to create notification thread shared data");
1788 /* Create notification thread. */
1789 notification_thread
= launch_notification_thread(
1790 the_notification_thread_handle
);
1791 if (!notification_thread
) {
1796 /* Create timer thread. */
1797 if (!launch_timer_thread(&timer_thread_parameters
)) {
1802 /* rotation_thread_data acquires the pipes' read side. */
1803 rotation_thread_handle
= rotation_thread_handle_create(
1804 rotation_timer_queue
, the_notification_thread_handle
);
1805 if (!rotation_thread_handle
) {
1807 ERR("Failed to create rotation thread shared data");
1812 /* Create rotation thread. */
1813 if (!launch_rotation_thread(rotation_thread_handle
)) {
1818 /* Create thread to manage the client socket */
1819 client_thread
= launch_client_thread();
1820 if (!client_thread
) {
1825 /* Set credentials of the client socket and rundir */
1826 if (is_root
&& set_permissions(the_config
.rundir
.value
)) {
1831 if (!launch_ust_dispatch_thread(&ust_cmd_queue
, apps_cmd_pipe
[1],
1832 apps_cmd_notify_pipe
[1])) {
1837 /* Create thread to manage application registration. */
1838 register_apps_thread
= launch_application_registration_thread(
1840 if (!register_apps_thread
) {
1845 /* Create thread to manage application socket */
1846 if (!launch_application_management_thread(apps_cmd_pipe
[0])) {
1851 /* Create thread to manage application notify socket */
1852 if (!launch_application_notification_thread(apps_cmd_notify_pipe
[0])) {
1857 /* Create agent management thread. */
1858 if (!launch_agent_management_thread()) {
1863 /* Don't start this thread if kernel tracing is not requested nor root */
1864 if (is_root
&& !the_config
.no_kernel
) {
1865 /* Create kernel thread to manage kernel event */
1866 if (!launch_kernel_management_thread(the_kernel_poll_pipe
[0])) {
1871 if (kernel_get_notification_fd() >= 0) {
1872 ret
= notification_thread_command_add_tracer_event_source(
1873 the_notification_thread_handle
,
1874 kernel_get_notification_fd(),
1875 LTTNG_DOMAIN_KERNEL
);
1876 if (ret
!= LTTNG_OK
) {
1877 ERR("Failed to add kernel trigger event source to notification thread");
1884 /* Load sessions. */
1885 ret
= config_load_session(
1886 the_config
.load_session_path
.value
, NULL
, 1, 1, NULL
);
1888 ERR("Session load failed: %s", error_get_str(ret
));
1893 /* Initialization completed. */
1894 sessiond_signal_parents();
1897 * This is where we start awaiting program completion (e.g. through
1898 * signal that asks threads to teardown).
1901 /* Initiate teardown once activity occurs on the quit pipe. */
1902 sessiond_wait_for_quit_pipe(-1);
1907 * Ensure that the client thread is no longer accepting new commands,
1908 * which could cause new sessions to be created.
1910 if (client_thread
) {
1911 lttng_thread_shutdown(client_thread
);
1912 lttng_thread_put(client_thread
);
1915 destroy_all_sessions_and_wait();
1918 * At this point no new trigger can be registered (no sessions are
1919 * running/rotating) and clients can't connect to the session daemon
1920 * anymore. Unregister all triggers.
1922 unregister_all_triggers();
1924 if (register_apps_thread
) {
1925 lttng_thread_shutdown(register_apps_thread
);
1926 lttng_thread_put(register_apps_thread
);
1928 lttng_thread_list_shutdown_orphans();
1931 * Wait for all pending call_rcu work to complete before tearing
1932 * down data structures. call_rcu worker may be trying to
1933 * perform lookups in those structures.
1937 * sessiond_cleanup() is called when no other thread is running, except
1938 * the ht_cleanup thread, which is needed to destroy the hash tables.
1940 rcu_thread_online();
1944 * Wait for all pending call_rcu work to complete before shutting down
1945 * the notification thread. This call_rcu work includes shutting down
1946 * UST apps and event notifier pipes.
1950 if (notification_thread
) {
1951 lttng_thread_shutdown(notification_thread
);
1952 lttng_thread_put(notification_thread
);
1956 * Error accounting teardown has to be done after the teardown of all
1957 * event notifier pipes to ensure that no tracer may try to use the
1958 * error accounting facilities.
1960 event_notifier_error_accounting_fini();
1963 * Unloading the kernel modules needs to be done after all kernel
1964 * ressources have been released. In our case, this includes the
1965 * notification fd, the event notifier group fd, error accounting fd,
1966 * all event and event notifier fds, etc.
1968 * In short, at this point, we need to have called close() on all fds
1969 * received from the kernel tracer.
1971 if (is_root
&& !the_config
.no_kernel
) {
1972 DBG("Unloading kernel modules");
1973 modprobe_remove_lttng_all();
1977 * Ensure all prior call_rcu are done. call_rcu callbacks may push
1978 * hash tables to the ht_cleanup thread. Therefore, we ensure that
1979 * the queue is empty before shutting down the clean-up thread.
1983 if (ht_cleanup_thread
) {
1984 lttng_thread_shutdown(ht_cleanup_thread
);
1985 lttng_thread_put(ht_cleanup_thread
);
1988 rcu_thread_offline();
1989 rcu_unregister_thread();
1991 if (rotation_thread_handle
) {
1992 rotation_thread_handle_destroy(rotation_thread_handle
);
1996 * After the rotation and timer thread have quit, we can safely destroy
1997 * the rotation_timer_queue.
1999 rotation_thread_timer_queue_destroy(rotation_timer_queue
);
2001 * The teardown of the notification system is performed after the
2002 * session daemon's teardown in order to allow it to be notified
2003 * of the active session and channels at the moment of the teardown.
2005 if (the_notification_thread_handle
) {
2006 notification_thread_handle_destroy(
2007 the_notification_thread_handle
);
2009 lttng_pipe_destroy(ust32_channel_monitor_pipe
);
2010 lttng_pipe_destroy(ust64_channel_monitor_pipe
);
2011 lttng_pipe_destroy(kernel_channel_monitor_pipe
);
2013 if (the_health_sessiond
) {
2014 health_app_destroy(the_health_sessiond
);
2016 exit_create_run_as_worker_cleanup
:
2018 sessiond_cleanup_lock_file();
2019 sessiond_cleanup_options();
2021 exit_set_signal_handler
: