2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
36 #include <sys/types.h>
38 #include <urcu/uatomic.h>
42 #include <common/common.h>
43 #include <common/compat/socket.h>
44 #include <common/compat/getenv.h>
45 #include <common/defaults.h>
46 #include <common/kernel-consumer/kernel-consumer.h>
47 #include <common/futex.h>
48 #include <common/relayd/relayd.h>
49 #include <common/utils.h>
50 #include <common/daemonize.h>
51 #include <common/config/session-config.h>
53 #include "lttng-sessiond.h"
54 #include "buffer-registry.h"
61 #include "kernel-consumer.h"
65 #include "ust-consumer.h"
68 #include "health-sessiond.h"
69 #include "testpoint.h"
70 #include "ust-thread.h"
71 #include "agent-thread.h"
73 #include "load-session-thread.h"
74 #include "notification-thread.h"
75 #include "notification-thread-commands.h"
76 #include "rotation-thread.h"
79 #include "ht-cleanup.h"
80 #include "sessiond-config.h"
81 #include "sessiond-timer.h"
83 static const char *help_msg
=
84 #ifdef LTTNG_EMBED_HELP
85 #include <lttng-sessiond.8.h>
92 static pid_t ppid
; /* Parent PID for --sig-parent option */
93 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
94 static int lockfile_fd
= -1;
96 /* Set to 1 when a SIGUSR1 signal is received. */
97 static int recv_child_signal
;
99 static struct lttng_kernel_tracer_version kernel_tracer_version
;
100 static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version
;
103 * Consumer daemon specific control data. Every value not initialized here is
104 * set to 0 by the static definition.
106 static struct consumer_data kconsumer_data
= {
107 .type
= LTTNG_CONSUMER_KERNEL
,
110 .channel_monitor_pipe
= -1,
111 .channel_rotate_pipe
= -1,
112 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
113 .lock
= PTHREAD_MUTEX_INITIALIZER
,
114 .cond
= PTHREAD_COND_INITIALIZER
,
115 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
117 static struct consumer_data ustconsumer64_data
= {
118 .type
= LTTNG_CONSUMER64_UST
,
121 .channel_monitor_pipe
= -1,
122 .channel_rotate_pipe
= -1,
123 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
124 .lock
= PTHREAD_MUTEX_INITIALIZER
,
125 .cond
= PTHREAD_COND_INITIALIZER
,
126 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
128 static struct consumer_data ustconsumer32_data
= {
129 .type
= LTTNG_CONSUMER32_UST
,
132 .channel_monitor_pipe
= -1,
133 .channel_rotate_pipe
= -1,
134 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
135 .lock
= PTHREAD_MUTEX_INITIALIZER
,
136 .cond
= PTHREAD_COND_INITIALIZER
,
137 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
140 /* Command line options */
141 static const struct option long_options
[] = {
142 { "client-sock", required_argument
, 0, 'c' },
143 { "apps-sock", required_argument
, 0, 'a' },
144 { "kconsumerd-cmd-sock", required_argument
, 0, '\0' },
145 { "kconsumerd-err-sock", required_argument
, 0, '\0' },
146 { "ustconsumerd32-cmd-sock", required_argument
, 0, '\0' },
147 { "ustconsumerd32-err-sock", required_argument
, 0, '\0' },
148 { "ustconsumerd64-cmd-sock", required_argument
, 0, '\0' },
149 { "ustconsumerd64-err-sock", required_argument
, 0, '\0' },
150 { "consumerd32-path", required_argument
, 0, '\0' },
151 { "consumerd32-libdir", required_argument
, 0, '\0' },
152 { "consumerd64-path", required_argument
, 0, '\0' },
153 { "consumerd64-libdir", required_argument
, 0, '\0' },
154 { "daemonize", no_argument
, 0, 'd' },
155 { "background", no_argument
, 0, 'b' },
156 { "sig-parent", no_argument
, 0, 'S' },
157 { "help", no_argument
, 0, 'h' },
158 { "group", required_argument
, 0, 'g' },
159 { "version", no_argument
, 0, 'V' },
160 { "quiet", no_argument
, 0, 'q' },
161 { "verbose", no_argument
, 0, 'v' },
162 { "verbose-consumer", no_argument
, 0, '\0' },
163 { "no-kernel", no_argument
, 0, '\0' },
164 { "pidfile", required_argument
, 0, 'p' },
165 { "agent-tcp-port", required_argument
, 0, '\0' },
166 { "config", required_argument
, 0, 'f' },
167 { "load", required_argument
, 0, 'l' },
168 { "kmod-probes", required_argument
, 0, '\0' },
169 { "extra-kmod-probes", required_argument
, 0, '\0' },
173 struct sessiond_config config
;
175 /* Command line options to ignore from configuration file */
176 static const char *config_ignore_options
[] = { "help", "version", "config" };
178 /* Shared between threads */
179 static int dispatch_thread_exit
;
181 /* Sockets and FDs */
182 static int client_sock
= -1;
183 static int apps_sock
= -1;
184 int kernel_tracer_fd
= -1;
185 static int kernel_poll_pipe
[2] = { -1, -1 };
188 * Quit pipe for all threads. This permits a single cancellation point
189 * for all threads when receiving an event on the pipe.
191 static int thread_quit_pipe
[2] = { -1, -1 };
194 * This pipe is used to inform the thread managing application communication
195 * that a command is queued and ready to be processed.
197 static int apps_cmd_pipe
[2] = { -1, -1 };
199 int apps_cmd_notify_pipe
[2] = { -1, -1 };
201 /* Pthread, Mutexes and Semaphores */
202 static pthread_t apps_thread
;
203 static pthread_t apps_notify_thread
;
204 static pthread_t reg_apps_thread
;
205 static pthread_t client_thread
;
206 static pthread_t kernel_thread
;
207 static pthread_t dispatch_thread
;
208 static pthread_t health_thread
;
209 static pthread_t ht_cleanup_thread
;
210 static pthread_t agent_reg_thread
;
211 static pthread_t load_session_thread
;
212 static pthread_t notification_thread
;
213 static pthread_t rotation_thread
;
214 static pthread_t timer_thread
;
217 * UST registration command queue. This queue is tied with a futex and uses a N
218 * wakers / 1 waiter implemented and detailed in futex.c/.h
220 * The thread_registration_apps and thread_dispatch_ust_registration uses this
221 * queue along with the wait/wake scheme. The thread_manage_apps receives down
222 * the line new application socket and monitors it for any I/O error or clean
223 * close that triggers an unregistration of the application.
225 static struct ust_cmd_queue ust_cmd_queue
;
228 * Pointer initialized before thread creation.
230 * This points to the tracing session list containing the session count and a
231 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
232 * MUST NOT be taken if you call a public function in session.c.
234 * The lock is nested inside the structure: session_list_ptr->lock. Please use
235 * session_lock_list and session_unlock_list for lock acquisition.
237 static struct ltt_session_list
*session_list_ptr
;
239 int ust_consumerd64_fd
= -1;
240 int ust_consumerd32_fd
= -1;
242 static const char *module_proc_lttng
= "/proc/lttng";
245 * Consumer daemon state which is changed when spawning it, killing it or in
246 * case of a fatal error.
248 enum consumerd_state
{
249 CONSUMER_STARTED
= 1,
250 CONSUMER_STOPPED
= 2,
255 * This consumer daemon state is used to validate if a client command will be
256 * able to reach the consumer. If not, the client is informed. For instance,
257 * doing a "lttng start" when the consumer state is set to ERROR will return an
258 * error to the client.
260 * The following example shows a possible race condition of this scheme:
262 * consumer thread error happens
264 * client cmd checks state -> still OK
265 * consumer thread exit, sets error
266 * client cmd try to talk to consumer
269 * However, since the consumer is a different daemon, we have no way of making
270 * sure the command will reach it safely even with this state flag. This is why
271 * we consider that up to the state validation during command processing, the
272 * command is safe. After that, we can not guarantee the correctness of the
273 * client request vis-a-vis the consumer.
275 static enum consumerd_state ust_consumerd_state
;
276 static enum consumerd_state kernel_consumerd_state
;
278 /* Set in main() with the current page size. */
281 /* Application health monitoring */
282 struct health_app
*health_sessiond
;
284 /* Am I root or not. */
285 int is_root
; /* Set to 1 if the daemon is running as root */
287 const char * const config_section_name
= "sessiond";
289 /* Load session thread information to operate. */
290 struct load_session_thread_data
*load_info
;
292 /* Notification thread handle. */
293 struct notification_thread_handle
*notification_thread_handle
;
295 /* Rotation thread handle. */
296 struct rotation_thread_handle
*rotation_thread_handle
;
298 /* Global hash tables */
299 struct lttng_ht
*agent_apps_ht_by_sock
= NULL
;
302 * Whether sessiond is ready for commands/notification channel/health check
304 * NR_LTTNG_SESSIOND_READY must match the number of calls to
305 * sessiond_notify_ready().
307 #define NR_LTTNG_SESSIOND_READY 5
308 int lttng_sessiond_ready
= NR_LTTNG_SESSIOND_READY
;
310 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
312 return (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) ? 1 : 0;
315 /* Notify parents that we are ready for cmd and health check */
317 void sessiond_notify_ready(void)
319 if (uatomic_sub_return(<tng_sessiond_ready
, 1) == 0) {
321 * Notify parent pid that we are ready to accept command
322 * for client side. This ppid is the one from the
323 * external process that spawned us.
325 if (config
.sig_parent
) {
330 * Notify the parent of the fork() process that we are
333 if (config
.daemonize
|| config
.background
) {
334 kill(child_ppid
, SIGUSR1
);
340 int __sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
,
347 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
353 ret
= lttng_poll_add(events
, a_pipe
[0], LPOLLIN
| LPOLLERR
);
365 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
367 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
369 return __sessiond_set_thread_pollset(events
, size
, thread_quit_pipe
);
373 * Init thread quit pipe.
375 * Return -1 on error or 0 if all pipes are created.
377 static int __init_thread_quit_pipe(int *a_pipe
)
383 PERROR("thread quit pipe");
387 for (i
= 0; i
< 2; i
++) {
388 ret
= fcntl(a_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
399 static int init_thread_quit_pipe(void)
401 return __init_thread_quit_pipe(thread_quit_pipe
);
405 * Stop all threads by closing the thread quit pipe.
407 static void stop_threads(void)
411 /* Stopping all threads */
412 DBG("Terminating all threads");
413 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
415 ERR("write error on thread quit pipe");
418 /* Dispatch thread */
419 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
420 futex_nto1_wake(&ust_cmd_queue
.futex
);
424 * Close every consumer sockets.
426 static void close_consumer_sockets(void)
430 if (kconsumer_data
.err_sock
>= 0) {
431 ret
= close(kconsumer_data
.err_sock
);
433 PERROR("kernel consumer err_sock close");
436 if (ustconsumer32_data
.err_sock
>= 0) {
437 ret
= close(ustconsumer32_data
.err_sock
);
439 PERROR("UST consumerd32 err_sock close");
442 if (ustconsumer64_data
.err_sock
>= 0) {
443 ret
= close(ustconsumer64_data
.err_sock
);
445 PERROR("UST consumerd64 err_sock close");
448 if (kconsumer_data
.cmd_sock
>= 0) {
449 ret
= close(kconsumer_data
.cmd_sock
);
451 PERROR("kernel consumer cmd_sock close");
454 if (ustconsumer32_data
.cmd_sock
>= 0) {
455 ret
= close(ustconsumer32_data
.cmd_sock
);
457 PERROR("UST consumerd32 cmd_sock close");
460 if (ustconsumer64_data
.cmd_sock
>= 0) {
461 ret
= close(ustconsumer64_data
.cmd_sock
);
463 PERROR("UST consumerd64 cmd_sock close");
466 if (kconsumer_data
.channel_monitor_pipe
>= 0) {
467 ret
= close(kconsumer_data
.channel_monitor_pipe
);
469 PERROR("kernel consumer channel monitor pipe close");
472 if (ustconsumer32_data
.channel_monitor_pipe
>= 0) {
473 ret
= close(ustconsumer32_data
.channel_monitor_pipe
);
475 PERROR("UST consumerd32 channel monitor pipe close");
478 if (ustconsumer64_data
.channel_monitor_pipe
>= 0) {
479 ret
= close(ustconsumer64_data
.channel_monitor_pipe
);
481 PERROR("UST consumerd64 channel monitor pipe close");
484 if (kconsumer_data
.channel_rotate_pipe
>= 0) {
485 ret
= close(kconsumer_data
.channel_rotate_pipe
);
487 PERROR("kernel consumer channel rotate pipe close");
490 if (ustconsumer32_data
.channel_rotate_pipe
>= 0) {
491 ret
= close(ustconsumer32_data
.channel_rotate_pipe
);
493 PERROR("UST consumerd32 channel rotate pipe close");
496 if (ustconsumer64_data
.channel_rotate_pipe
>= 0) {
497 ret
= close(ustconsumer64_data
.channel_rotate_pipe
);
499 PERROR("UST consumerd64 channel rotate pipe close");
505 * Wait on consumer process termination.
507 * Need to be called with the consumer data lock held or from a context
508 * ensuring no concurrent access to data (e.g: cleanup).
510 static void wait_consumer(struct consumer_data
*consumer_data
)
515 if (consumer_data
->pid
<= 0) {
519 DBG("Waiting for complete teardown of consumerd (PID: %d)",
521 ret
= waitpid(consumer_data
->pid
, &status
, 0);
523 PERROR("consumerd waitpid pid: %d", consumer_data
->pid
)
524 } else if (!WIFEXITED(status
)) {
525 ERR("consumerd termination with error: %d",
528 consumer_data
->pid
= 0;
532 * Cleanup the session daemon's data structures.
534 static void sessiond_cleanup(void)
537 struct ltt_session
*sess
, *stmp
;
539 DBG("Cleanup sessiond");
542 * Close the thread quit pipe. It has already done its job,
543 * since we are now called.
545 utils_close_pipe(thread_quit_pipe
);
548 * If config.pid_file_path.value is undefined, the default file will be
549 * wiped when removing the rundir.
551 if (config
.pid_file_path
.value
) {
552 ret
= remove(config
.pid_file_path
.value
);
554 PERROR("remove pidfile %s", config
.pid_file_path
.value
);
558 DBG("Removing sessiond and consumerd content of directory %s",
559 config
.rundir
.value
);
562 DBG("Removing %s", config
.pid_file_path
.value
);
563 (void) unlink(config
.pid_file_path
.value
);
565 DBG("Removing %s", config
.agent_port_file_path
.value
);
566 (void) unlink(config
.agent_port_file_path
.value
);
569 DBG("Removing %s", kconsumer_data
.err_unix_sock_path
);
570 (void) unlink(kconsumer_data
.err_unix_sock_path
);
572 DBG("Removing directory %s", config
.kconsumerd_path
.value
);
573 (void) rmdir(config
.kconsumerd_path
.value
);
575 /* ust consumerd 32 */
576 DBG("Removing %s", config
.consumerd32_err_unix_sock_path
.value
);
577 (void) unlink(config
.consumerd32_err_unix_sock_path
.value
);
579 DBG("Removing directory %s", config
.consumerd32_path
.value
);
580 (void) rmdir(config
.consumerd32_path
.value
);
582 /* ust consumerd 64 */
583 DBG("Removing %s", config
.consumerd64_err_unix_sock_path
.value
);
584 (void) unlink(config
.consumerd64_err_unix_sock_path
.value
);
586 DBG("Removing directory %s", config
.consumerd64_path
.value
);
587 (void) rmdir(config
.consumerd64_path
.value
);
589 DBG("Cleaning up all sessions");
591 /* Destroy session list mutex */
592 if (session_list_ptr
!= NULL
) {
593 pthread_mutex_destroy(&session_list_ptr
->lock
);
595 /* Cleanup ALL session */
596 cds_list_for_each_entry_safe(sess
, stmp
,
597 &session_list_ptr
->head
, list
) {
598 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
602 wait_consumer(&kconsumer_data
);
603 wait_consumer(&ustconsumer64_data
);
604 wait_consumer(&ustconsumer32_data
);
606 DBG("Cleaning up all agent apps");
607 agent_app_ht_clean();
609 DBG("Closing all UST sockets");
610 ust_app_clean_list();
611 buffer_reg_destroy_registries();
613 if (is_root
&& !config
.no_kernel
) {
614 DBG2("Closing kernel fd");
615 if (kernel_tracer_fd
>= 0) {
616 ret
= close(kernel_tracer_fd
);
621 DBG("Unloading kernel modules");
622 modprobe_remove_lttng_all();
626 close_consumer_sockets();
629 load_session_destroy_data(load_info
);
634 * Cleanup lock file by deleting it and finaly closing it which will
635 * release the file system lock.
637 if (lockfile_fd
>= 0) {
638 ret
= remove(config
.lock_file_path
.value
);
640 PERROR("remove lock file");
642 ret
= close(lockfile_fd
);
644 PERROR("close lock file");
649 * We do NOT rmdir rundir because there are other processes
650 * using it, for instance lttng-relayd, which can start in
651 * parallel with this teardown.
656 * Cleanup the daemon's option data structures.
658 static void sessiond_cleanup_options(void)
660 DBG("Cleaning up options");
662 sessiond_config_fini(&config
);
664 run_as_destroy_worker();
668 * Send data on a unix socket using the liblttsessiondcomm API.
670 * Return lttcomm error code.
672 static int send_unix_sock(int sock
, void *buf
, size_t len
)
674 /* Check valid length */
679 return lttcomm_send_unix_sock(sock
, buf
, len
);
683 * Free memory of a command context structure.
685 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
687 DBG("Clean command context structure");
689 if ((*cmd_ctx
)->llm
) {
690 free((*cmd_ctx
)->llm
);
692 if ((*cmd_ctx
)->lsm
) {
693 free((*cmd_ctx
)->lsm
);
701 * Notify UST applications using the shm mmap futex.
703 static int notify_ust_apps(int active
)
707 DBG("Notifying applications of session daemon state: %d", active
);
709 /* See shm.c for this call implying mmap, shm and futex calls */
710 wait_shm_mmap
= shm_ust_get_mmap(config
.wait_shm_path
.value
, is_root
);
711 if (wait_shm_mmap
== NULL
) {
715 /* Wake waiting process */
716 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
718 /* Apps notified successfully */
726 * Setup the outgoing data buffer for the response (llm) by allocating the
727 * right amount of memory and copying the original information from the lsm
730 * Return 0 on success, negative value on error.
732 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
,
733 const void *payload_buf
, size_t payload_len
,
734 const void *cmd_header_buf
, size_t cmd_header_len
)
737 const size_t header_len
= sizeof(struct lttcomm_lttng_msg
);
738 const size_t cmd_header_offset
= header_len
;
739 const size_t payload_offset
= cmd_header_offset
+ cmd_header_len
;
740 const size_t total_msg_size
= header_len
+ cmd_header_len
+ payload_len
;
742 cmd_ctx
->llm
= zmalloc(total_msg_size
);
744 if (cmd_ctx
->llm
== NULL
) {
750 /* Copy common data */
751 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
752 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
753 cmd_ctx
->llm
->cmd_header_size
= cmd_header_len
;
754 cmd_ctx
->llm
->data_size
= payload_len
;
755 cmd_ctx
->lttng_msg_size
= total_msg_size
;
757 /* Copy command header */
758 if (cmd_header_len
) {
759 memcpy(((uint8_t *) cmd_ctx
->llm
) + cmd_header_offset
, cmd_header_buf
,
765 memcpy(((uint8_t *) cmd_ctx
->llm
) + payload_offset
, payload_buf
,
774 * Version of setup_lttng_msg() without command header.
776 static int setup_lttng_msg_no_cmd_header(struct command_ctx
*cmd_ctx
,
777 void *payload_buf
, size_t payload_len
)
779 return setup_lttng_msg(cmd_ctx
, payload_buf
, payload_len
, NULL
, 0);
782 * Update the kernel poll set of all channel fd available over all tracing
783 * session. Add the wakeup pipe at the end of the set.
785 static int update_kernel_poll(struct lttng_poll_event
*events
)
788 struct ltt_session
*session
;
789 struct ltt_kernel_channel
*channel
;
791 DBG("Updating kernel poll set");
794 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
795 session_lock(session
);
796 if (session
->kernel_session
== NULL
) {
797 session_unlock(session
);
801 cds_list_for_each_entry(channel
,
802 &session
->kernel_session
->channel_list
.head
, list
) {
803 /* Add channel fd to the kernel poll set */
804 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
806 session_unlock(session
);
809 DBG("Channel fd %d added to kernel set", channel
->fd
);
811 session_unlock(session
);
813 session_unlock_list();
818 session_unlock_list();
823 * Find the channel fd from 'fd' over all tracing session. When found, check
824 * for new channel stream and send those stream fds to the kernel consumer.
826 * Useful for CPU hotplug feature.
828 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
831 struct ltt_session
*session
;
832 struct ltt_kernel_session
*ksess
;
833 struct ltt_kernel_channel
*channel
;
835 DBG("Updating kernel streams for channel fd %d", fd
);
838 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
839 session_lock(session
);
840 if (session
->kernel_session
== NULL
) {
841 session_unlock(session
);
844 ksess
= session
->kernel_session
;
846 cds_list_for_each_entry(channel
,
847 &ksess
->channel_list
.head
, list
) {
848 struct lttng_ht_iter iter
;
849 struct consumer_socket
*socket
;
851 if (channel
->fd
!= fd
) {
854 DBG("Channel found, updating kernel streams");
855 ret
= kernel_open_channel_stream(channel
);
859 /* Update the stream global counter */
860 ksess
->stream_count_global
+= ret
;
863 * Have we already sent fds to the consumer? If yes, it
864 * means that tracing is started so it is safe to send
865 * our updated stream fds.
867 if (ksess
->consumer_fds_sent
!= 1
868 || ksess
->consumer
== NULL
) {
874 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
875 &iter
.iter
, socket
, node
.node
) {
876 pthread_mutex_lock(socket
->lock
);
877 ret
= kernel_consumer_send_channel_stream(socket
,
879 session
->output_traces
? 1 : 0);
880 pthread_mutex_unlock(socket
->lock
);
888 session_unlock(session
);
890 session_unlock_list();
894 session_unlock(session
);
895 session_unlock_list();
900 * For each tracing session, update newly registered apps. The session list
901 * lock MUST be acquired before calling this.
903 static void update_ust_app(int app_sock
)
905 struct ltt_session
*sess
, *stmp
;
907 /* Consumer is in an ERROR state. Stop any application update. */
908 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
909 /* Stop the update process since the consumer is dead. */
913 /* For all tracing session(s) */
914 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
918 if (!sess
->ust_session
) {
923 assert(app_sock
>= 0);
924 app
= ust_app_find_by_sock(app_sock
);
927 * Application can be unregistered before so
928 * this is possible hence simply stopping the
931 DBG3("UST app update failed to find app sock %d",
935 ust_app_global_update(sess
->ust_session
, app
);
939 session_unlock(sess
);
944 * This thread manage event coming from the kernel.
946 * Features supported in this thread:
949 static void *thread_manage_kernel(void *data
)
951 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
952 uint32_t revents
, nb_fd
;
954 struct lttng_poll_event events
;
956 DBG("[thread] Thread manage kernel started");
958 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_KERNEL
);
961 * This first step of the while is to clean this structure which could free
962 * non NULL pointers so initialize it before the loop.
964 lttng_poll_init(&events
);
966 if (testpoint(sessiond_thread_manage_kernel
)) {
967 goto error_testpoint
;
970 health_code_update();
972 if (testpoint(sessiond_thread_manage_kernel_before_loop
)) {
973 goto error_testpoint
;
977 health_code_update();
979 if (update_poll_flag
== 1) {
980 /* Clean events object. We are about to populate it again. */
981 lttng_poll_clean(&events
);
983 ret
= sessiond_set_thread_pollset(&events
, 2);
985 goto error_poll_create
;
988 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
993 /* This will add the available kernel channel if any. */
994 ret
= update_kernel_poll(&events
);
998 update_poll_flag
= 0;
1001 DBG("Thread kernel polling");
1003 /* Poll infinite value of time */
1005 health_poll_entry();
1006 ret
= lttng_poll_wait(&events
, -1);
1007 DBG("Thread kernel return from poll on %d fds",
1008 LTTNG_POLL_GETNB(&events
));
1012 * Restart interrupted system call.
1014 if (errno
== EINTR
) {
1018 } else if (ret
== 0) {
1019 /* Should not happen since timeout is infinite */
1020 ERR("Return value of poll is 0 with an infinite timeout.\n"
1021 "This should not have happened! Continuing...");
1027 for (i
= 0; i
< nb_fd
; i
++) {
1028 /* Fetch once the poll data */
1029 revents
= LTTNG_POLL_GETEV(&events
, i
);
1030 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1032 health_code_update();
1035 /* No activity for this FD (poll implementation). */
1039 /* Thread quit pipe has been closed. Killing thread. */
1040 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1046 /* Check for data on kernel pipe */
1047 if (revents
& LPOLLIN
) {
1048 if (pollfd
== kernel_poll_pipe
[0]) {
1049 (void) lttng_read(kernel_poll_pipe
[0],
1052 * Ret value is useless here, if this pipe gets any actions an
1053 * update is required anyway.
1055 update_poll_flag
= 1;
1059 * New CPU detected by the kernel. Adding kernel stream to
1060 * kernel session and updating the kernel consumer
1062 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
1068 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1069 update_poll_flag
= 1;
1072 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1080 lttng_poll_clean(&events
);
1083 utils_close_pipe(kernel_poll_pipe
);
1084 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
1087 ERR("Health error occurred in %s", __func__
);
1088 WARN("Kernel thread died unexpectedly. "
1089 "Kernel tracing can continue but CPU hotplug is disabled.");
1091 health_unregister(health_sessiond
);
1092 DBG("Kernel thread dying");
1097 * Signal pthread condition of the consumer data that the thread.
1099 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
1101 pthread_mutex_lock(&data
->cond_mutex
);
1104 * The state is set before signaling. It can be any value, it's the waiter
1105 * job to correctly interpret this condition variable associated to the
1106 * consumer pthread_cond.
1108 * A value of 0 means that the corresponding thread of the consumer data
1109 * was not started. 1 indicates that the thread has started and is ready
1110 * for action. A negative value means that there was an error during the
1113 data
->consumer_thread_is_ready
= state
;
1114 (void) pthread_cond_signal(&data
->cond
);
1116 pthread_mutex_unlock(&data
->cond_mutex
);
1120 * This thread manage the consumer error sent back to the session daemon.
1122 static void *thread_manage_consumer(void *data
)
1124 int sock
= -1, i
, ret
, pollfd
, err
= -1, should_quit
= 0;
1125 uint32_t revents
, nb_fd
;
1126 enum lttcomm_return_code code
;
1127 struct lttng_poll_event events
;
1128 struct consumer_data
*consumer_data
= data
;
1129 struct consumer_socket
*cmd_socket_wrapper
= NULL
;
1131 DBG("[thread] Manage consumer started");
1133 rcu_register_thread();
1134 rcu_thread_online();
1136 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
1138 health_code_update();
1141 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1142 * metadata_sock. Nothing more will be added to this poll set.
1144 ret
= sessiond_set_thread_pollset(&events
, 3);
1150 * The error socket here is already in a listening state which was done
1151 * just before spawning this thread to avoid a race between the consumer
1152 * daemon exec trying to connect and the listen() call.
1154 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1159 health_code_update();
1161 /* Infinite blocking call, waiting for transmission */
1163 health_poll_entry();
1165 if (testpoint(sessiond_thread_manage_consumer
)) {
1169 ret
= lttng_poll_wait(&events
, -1);
1173 * Restart interrupted system call.
1175 if (errno
== EINTR
) {
1183 for (i
= 0; i
< nb_fd
; i
++) {
1184 /* Fetch once the poll data */
1185 revents
= LTTNG_POLL_GETEV(&events
, i
);
1186 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1188 health_code_update();
1191 /* No activity for this FD (poll implementation). */
1195 /* Thread quit pipe has been closed. Killing thread. */
1196 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1202 /* Event on the registration socket */
1203 if (pollfd
== consumer_data
->err_sock
) {
1204 if (revents
& LPOLLIN
) {
1206 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1207 ERR("consumer err socket poll error");
1210 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1216 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1222 * Set the CLOEXEC flag. Return code is useless because either way, the
1225 (void) utils_set_fd_cloexec(sock
);
1227 health_code_update();
1229 DBG2("Receiving code from consumer err_sock");
1231 /* Getting status code from kconsumerd */
1232 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1233 sizeof(enum lttcomm_return_code
));
1238 health_code_update();
1239 if (code
!= LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1240 ERR("consumer error when waiting for SOCK_READY : %s",
1241 lttcomm_get_readable_code(-code
));
1245 /* Connect both command and metadata sockets. */
1246 consumer_data
->cmd_sock
=
1247 lttcomm_connect_unix_sock(
1248 consumer_data
->cmd_unix_sock_path
);
1249 consumer_data
->metadata_fd
=
1250 lttcomm_connect_unix_sock(
1251 consumer_data
->cmd_unix_sock_path
);
1252 if (consumer_data
->cmd_sock
< 0 || consumer_data
->metadata_fd
< 0) {
1253 PERROR("consumer connect cmd socket");
1254 /* On error, signal condition and quit. */
1255 signal_consumer_condition(consumer_data
, -1);
1259 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1261 /* Create metadata socket lock. */
1262 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1263 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1264 PERROR("zmalloc pthread mutex");
1267 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1269 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1270 DBG("Consumer metadata socket ready (fd: %d)",
1271 consumer_data
->metadata_fd
);
1274 * Remove the consumerd error sock since we've established a connection.
1276 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1281 /* Add new accepted error socket. */
1282 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1287 /* Add metadata socket that is successfully connected. */
1288 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1289 LPOLLIN
| LPOLLRDHUP
);
1294 health_code_update();
1297 * Transfer the write-end of the channel monitoring and rotate pipe
1298 * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE and
1299 * SET_CHANNEL_ROTATE_PIPE commands.
1301 cmd_socket_wrapper
= consumer_allocate_socket(&consumer_data
->cmd_sock
);
1302 if (!cmd_socket_wrapper
) {
1305 cmd_socket_wrapper
->lock
= &consumer_data
->lock
;
1307 ret
= consumer_send_channel_monitor_pipe(cmd_socket_wrapper
,
1308 consumer_data
->channel_monitor_pipe
);
1313 ret
= consumer_send_channel_rotate_pipe(cmd_socket_wrapper
,
1314 consumer_data
->channel_rotate_pipe
);
1319 /* Discard the socket wrapper as it is no longer needed. */
1320 consumer_destroy_socket(cmd_socket_wrapper
);
1321 cmd_socket_wrapper
= NULL
;
1323 /* The thread is completely initialized, signal that it is ready. */
1324 signal_consumer_condition(consumer_data
, 1);
1326 /* Infinite blocking call, waiting for transmission */
1329 health_code_update();
1331 /* Exit the thread because the thread quit pipe has been triggered. */
1333 /* Not a health error. */
1338 health_poll_entry();
1339 ret
= lttng_poll_wait(&events
, -1);
1343 * Restart interrupted system call.
1345 if (errno
== EINTR
) {
1353 for (i
= 0; i
< nb_fd
; i
++) {
1354 /* Fetch once the poll data */
1355 revents
= LTTNG_POLL_GETEV(&events
, i
);
1356 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1358 health_code_update();
1361 /* No activity for this FD (poll implementation). */
1366 * Thread quit pipe has been triggered, flag that we should stop
1367 * but continue the current loop to handle potential data from
1370 should_quit
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1372 if (pollfd
== sock
) {
1373 /* Event on the consumerd socket */
1374 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1375 && !(revents
& LPOLLIN
)) {
1376 ERR("consumer err socket second poll error");
1379 health_code_update();
1380 /* Wait for any kconsumerd error */
1381 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1382 sizeof(enum lttcomm_return_code
));
1384 ERR("consumer closed the command socket");
1388 ERR("consumer return code : %s",
1389 lttcomm_get_readable_code(-code
));
1392 } else if (pollfd
== consumer_data
->metadata_fd
) {
1393 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1394 && !(revents
& LPOLLIN
)) {
1395 ERR("consumer err metadata socket second poll error");
1398 /* UST metadata requests */
1399 ret
= ust_consumer_metadata_request(
1400 &consumer_data
->metadata_sock
);
1402 ERR("Handling metadata request");
1406 /* No need for an else branch all FDs are tested prior. */
1408 health_code_update();
1414 * We lock here because we are about to close the sockets and some other
1415 * thread might be using them so get exclusive access which will abort all
1416 * other consumer command by other threads.
1418 pthread_mutex_lock(&consumer_data
->lock
);
1420 /* Immediately set the consumerd state to stopped */
1421 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1422 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1423 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1424 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1425 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1427 /* Code flow error... */
1431 if (consumer_data
->err_sock
>= 0) {
1432 ret
= close(consumer_data
->err_sock
);
1436 consumer_data
->err_sock
= -1;
1438 if (consumer_data
->cmd_sock
>= 0) {
1439 ret
= close(consumer_data
->cmd_sock
);
1443 consumer_data
->cmd_sock
= -1;
1445 if (consumer_data
->metadata_sock
.fd_ptr
&&
1446 *consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1447 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1459 unlink(consumer_data
->err_unix_sock_path
);
1460 unlink(consumer_data
->cmd_unix_sock_path
);
1461 pthread_mutex_unlock(&consumer_data
->lock
);
1463 /* Cleanup metadata socket mutex. */
1464 if (consumer_data
->metadata_sock
.lock
) {
1465 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1466 free(consumer_data
->metadata_sock
.lock
);
1468 lttng_poll_clean(&events
);
1470 if (cmd_socket_wrapper
) {
1471 consumer_destroy_socket(cmd_socket_wrapper
);
1476 ERR("Health error occurred in %s", __func__
);
1478 health_unregister(health_sessiond
);
1479 DBG("consumer thread cleanup completed");
1481 rcu_thread_offline();
1482 rcu_unregister_thread();
1488 * This thread receives application command sockets (FDs) on the
1489 * apps_cmd_pipe and waits (polls) on them until they are closed
1490 * or an error occurs.
1492 * At that point, it flushes the data (tracing and metadata) associated
1493 * with this application and tears down ust app sessions and other
1494 * associated data structures through ust_app_unregister().
1496 * Note that this thread never sends commands to the applications
1497 * through the command sockets; it merely listens for hang-ups
1498 * and errors on those sockets and cleans-up as they occur.
1500 static void *thread_manage_apps(void *data
)
1502 int i
, ret
, pollfd
, err
= -1;
1504 uint32_t revents
, nb_fd
;
1505 struct lttng_poll_event events
;
1507 DBG("[thread] Manage application started");
1509 rcu_register_thread();
1510 rcu_thread_online();
1512 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1514 if (testpoint(sessiond_thread_manage_apps
)) {
1515 goto error_testpoint
;
1518 health_code_update();
1520 ret
= sessiond_set_thread_pollset(&events
, 2);
1522 goto error_poll_create
;
1525 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1530 if (testpoint(sessiond_thread_manage_apps_before_loop
)) {
1534 health_code_update();
1537 DBG("Apps thread polling");
1539 /* Inifinite blocking call, waiting for transmission */
1541 health_poll_entry();
1542 ret
= lttng_poll_wait(&events
, -1);
1543 DBG("Apps thread return from poll on %d fds",
1544 LTTNG_POLL_GETNB(&events
));
1548 * Restart interrupted system call.
1550 if (errno
== EINTR
) {
1558 for (i
= 0; i
< nb_fd
; i
++) {
1559 /* Fetch once the poll data */
1560 revents
= LTTNG_POLL_GETEV(&events
, i
);
1561 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1563 health_code_update();
1566 /* No activity for this FD (poll implementation). */
1570 /* Thread quit pipe has been closed. Killing thread. */
1571 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1577 /* Inspect the apps cmd pipe */
1578 if (pollfd
== apps_cmd_pipe
[0]) {
1579 if (revents
& LPOLLIN
) {
1583 size_ret
= lttng_read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1584 if (size_ret
< sizeof(sock
)) {
1585 PERROR("read apps cmd pipe");
1589 health_code_update();
1592 * Since this is a command socket (write then read),
1593 * we only monitor the error events of the socket.
1595 ret
= lttng_poll_add(&events
, sock
,
1596 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1601 DBG("Apps with sock %d added to poll set", sock
);
1602 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1603 ERR("Apps command pipe error");
1606 ERR("Unknown poll events %u for sock %d", revents
, pollfd
);
1611 * At this point, we know that a registered application made
1612 * the event at poll_wait.
1614 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1615 /* Removing from the poll set */
1616 ret
= lttng_poll_del(&events
, pollfd
);
1621 /* Socket closed on remote end. */
1622 ust_app_unregister(pollfd
);
1624 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1629 health_code_update();
1635 lttng_poll_clean(&events
);
1638 utils_close_pipe(apps_cmd_pipe
);
1639 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1642 * We don't clean the UST app hash table here since already registered
1643 * applications can still be controlled so let them be until the session
1644 * daemon dies or the applications stop.
1649 ERR("Health error occurred in %s", __func__
);
1651 health_unregister(health_sessiond
);
1652 DBG("Application communication apps thread cleanup complete");
1653 rcu_thread_offline();
1654 rcu_unregister_thread();
1659 * Send a socket to a thread This is called from the dispatch UST registration
1660 * thread once all sockets are set for the application.
1662 * The sock value can be invalid, we don't really care, the thread will handle
1663 * it and make the necessary cleanup if so.
1665 * On success, return 0 else a negative value being the errno message of the
1668 static int send_socket_to_thread(int fd
, int sock
)
1673 * It's possible that the FD is set as invalid with -1 concurrently just
1674 * before calling this function being a shutdown state of the thread.
1681 ret
= lttng_write(fd
, &sock
, sizeof(sock
));
1682 if (ret
< sizeof(sock
)) {
1683 PERROR("write apps pipe %d", fd
);
1690 /* All good. Don't send back the write positive ret value. */
1697 * Sanitize the wait queue of the dispatch registration thread meaning removing
1698 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1699 * notify socket is never received.
1701 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1703 int ret
, nb_fd
= 0, i
;
1704 unsigned int fd_added
= 0;
1705 struct lttng_poll_event events
;
1706 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1710 lttng_poll_init(&events
);
1712 /* Just skip everything for an empty queue. */
1713 if (!wait_queue
->count
) {
1717 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1722 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1723 &wait_queue
->head
, head
) {
1724 assert(wait_node
->app
);
1725 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1726 LPOLLHUP
| LPOLLERR
);
1739 * Poll but don't block so we can quickly identify the faulty events and
1740 * clean them afterwards from the wait queue.
1742 ret
= lttng_poll_wait(&events
, 0);
1748 for (i
= 0; i
< nb_fd
; i
++) {
1749 /* Get faulty FD. */
1750 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1751 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1754 /* No activity for this FD (poll implementation). */
1758 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1759 &wait_queue
->head
, head
) {
1760 if (pollfd
== wait_node
->app
->sock
&&
1761 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1762 cds_list_del(&wait_node
->head
);
1763 wait_queue
->count
--;
1764 ust_app_destroy(wait_node
->app
);
1767 * Silence warning of use-after-free in
1768 * cds_list_for_each_entry_safe which uses
1769 * __typeof__(*wait_node).
1774 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1781 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1785 lttng_poll_clean(&events
);
1789 lttng_poll_clean(&events
);
1791 ERR("Unable to sanitize wait queue");
1796 * Dispatch request from the registration threads to the application
1797 * communication thread.
1799 static void *thread_dispatch_ust_registration(void *data
)
1802 struct cds_wfcq_node
*node
;
1803 struct ust_command
*ust_cmd
= NULL
;
1804 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1805 struct ust_reg_wait_queue wait_queue
= {
1809 rcu_register_thread();
1811 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1813 if (testpoint(sessiond_thread_app_reg_dispatch
)) {
1814 goto error_testpoint
;
1817 health_code_update();
1819 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1821 DBG("[thread] Dispatch UST command started");
1824 health_code_update();
1826 /* Atomically prepare the queue futex */
1827 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1829 if (CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1834 struct ust_app
*app
= NULL
;
1838 * Make sure we don't have node(s) that have hung up before receiving
1839 * the notify socket. This is to clean the list in order to avoid
1840 * memory leaks from notify socket that are never seen.
1842 sanitize_wait_queue(&wait_queue
);
1844 health_code_update();
1845 /* Dequeue command for registration */
1846 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1848 DBG("Woken up but nothing in the UST command queue");
1849 /* Continue thread execution */
1853 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1855 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1856 " gid:%d sock:%d name:%s (version %d.%d)",
1857 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1858 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1859 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1860 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1862 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1863 wait_node
= zmalloc(sizeof(*wait_node
));
1865 PERROR("zmalloc wait_node dispatch");
1866 ret
= close(ust_cmd
->sock
);
1868 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1870 lttng_fd_put(LTTNG_FD_APPS
, 1);
1874 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1876 /* Create application object if socket is CMD. */
1877 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1879 if (!wait_node
->app
) {
1880 ret
= close(ust_cmd
->sock
);
1882 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1884 lttng_fd_put(LTTNG_FD_APPS
, 1);
1890 * Add application to the wait queue so we can set the notify
1891 * socket before putting this object in the global ht.
1893 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1898 * We have to continue here since we don't have the notify
1899 * socket and the application MUST be added to the hash table
1900 * only at that moment.
1905 * Look for the application in the local wait queue and set the
1906 * notify socket if found.
1908 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1909 &wait_queue
.head
, head
) {
1910 health_code_update();
1911 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1912 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1913 cds_list_del(&wait_node
->head
);
1915 app
= wait_node
->app
;
1917 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1923 * With no application at this stage the received socket is
1924 * basically useless so close it before we free the cmd data
1925 * structure for good.
1928 ret
= close(ust_cmd
->sock
);
1930 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1932 lttng_fd_put(LTTNG_FD_APPS
, 1);
1939 * @session_lock_list
1941 * Lock the global session list so from the register up to the
1942 * registration done message, no thread can see the application
1943 * and change its state.
1945 session_lock_list();
1949 * Add application to the global hash table. This needs to be
1950 * done before the update to the UST registry can locate the
1955 /* Set app version. This call will print an error if needed. */
1956 (void) ust_app_version(app
);
1958 /* Send notify socket through the notify pipe. */
1959 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1963 session_unlock_list();
1965 * No notify thread, stop the UST tracing. However, this is
1966 * not an internal error of the this thread thus setting
1967 * the health error code to a normal exit.
1974 * Update newly registered application with the tracing
1975 * registry info already enabled information.
1977 update_ust_app(app
->sock
);
1980 * Don't care about return value. Let the manage apps threads
1981 * handle app unregistration upon socket close.
1983 (void) ust_app_register_done(app
);
1986 * Even if the application socket has been closed, send the app
1987 * to the thread and unregistration will take place at that
1990 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1993 session_unlock_list();
1995 * No apps. thread, stop the UST tracing. However, this is
1996 * not an internal error of the this thread thus setting
1997 * the health error code to a normal exit.
2004 session_unlock_list();
2006 } while (node
!= NULL
);
2008 health_poll_entry();
2009 /* Futex wait on queue. Blocking call on futex() */
2010 futex_nto1_wait(&ust_cmd_queue
.futex
);
2013 /* Normal exit, no error */
2017 /* Clean up wait queue. */
2018 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
2019 &wait_queue
.head
, head
) {
2020 cds_list_del(&wait_node
->head
);
2025 /* Empty command queue. */
2027 /* Dequeue command for registration */
2028 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
2032 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
2033 ret
= close(ust_cmd
->sock
);
2035 PERROR("close ust sock exit dispatch %d", ust_cmd
->sock
);
2037 lttng_fd_put(LTTNG_FD_APPS
, 1);
2042 DBG("Dispatch thread dying");
2045 ERR("Health error occurred in %s", __func__
);
2047 health_unregister(health_sessiond
);
2048 rcu_unregister_thread();
2053 * This thread manage application registration.
2055 static void *thread_registration_apps(void *data
)
2057 int sock
= -1, i
, ret
, pollfd
, err
= -1;
2058 uint32_t revents
, nb_fd
;
2059 struct lttng_poll_event events
;
2061 * Get allocated in this thread, enqueued to a global queue, dequeued and
2062 * freed in the manage apps thread.
2064 struct ust_command
*ust_cmd
= NULL
;
2066 DBG("[thread] Manage application registration started");
2068 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
2070 if (testpoint(sessiond_thread_registration_apps
)) {
2071 goto error_testpoint
;
2074 ret
= lttcomm_listen_unix_sock(apps_sock
);
2080 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2081 * more will be added to this poll set.
2083 ret
= sessiond_set_thread_pollset(&events
, 2);
2085 goto error_create_poll
;
2088 /* Add the application registration socket */
2089 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
2091 goto error_poll_add
;
2094 /* Notify all applications to register */
2095 ret
= notify_ust_apps(1);
2097 ERR("Failed to notify applications or create the wait shared memory.\n"
2098 "Execution continues but there might be problem for already\n"
2099 "running applications that wishes to register.");
2103 DBG("Accepting application registration");
2105 /* Inifinite blocking call, waiting for transmission */
2107 health_poll_entry();
2108 ret
= lttng_poll_wait(&events
, -1);
2112 * Restart interrupted system call.
2114 if (errno
== EINTR
) {
2122 for (i
= 0; i
< nb_fd
; i
++) {
2123 health_code_update();
2125 /* Fetch once the poll data */
2126 revents
= LTTNG_POLL_GETEV(&events
, i
);
2127 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2130 /* No activity for this FD (poll implementation). */
2134 /* Thread quit pipe has been closed. Killing thread. */
2135 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
2141 /* Event on the registration socket */
2142 if (pollfd
== apps_sock
) {
2143 if (revents
& LPOLLIN
) {
2144 sock
= lttcomm_accept_unix_sock(apps_sock
);
2150 * Set socket timeout for both receiving and ending.
2151 * app_socket_timeout is in seconds, whereas
2152 * lttcomm_setsockopt_rcv_timeout and
2153 * lttcomm_setsockopt_snd_timeout expect msec as
2156 if (config
.app_socket_timeout
>= 0) {
2157 (void) lttcomm_setsockopt_rcv_timeout(sock
,
2158 config
.app_socket_timeout
* 1000);
2159 (void) lttcomm_setsockopt_snd_timeout(sock
,
2160 config
.app_socket_timeout
* 1000);
2164 * Set the CLOEXEC flag. Return code is useless because
2165 * either way, the show must go on.
2167 (void) utils_set_fd_cloexec(sock
);
2169 /* Create UST registration command for enqueuing */
2170 ust_cmd
= zmalloc(sizeof(struct ust_command
));
2171 if (ust_cmd
== NULL
) {
2172 PERROR("ust command zmalloc");
2181 * Using message-based transmissions to ensure we don't
2182 * have to deal with partially received messages.
2184 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2186 ERR("Exhausted file descriptors allowed for applications.");
2196 health_code_update();
2197 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
2200 /* Close socket of the application. */
2205 lttng_fd_put(LTTNG_FD_APPS
, 1);
2209 health_code_update();
2211 ust_cmd
->sock
= sock
;
2214 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2215 " gid:%d sock:%d name:%s (version %d.%d)",
2216 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
2217 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
2218 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
2219 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
2222 * Lock free enqueue the registration request. The red pill
2223 * has been taken! This apps will be part of the *system*.
2225 cds_wfcq_enqueue(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
, &ust_cmd
->node
);
2228 * Wake the registration queue futex. Implicit memory
2229 * barrier with the exchange in cds_wfcq_enqueue.
2231 futex_nto1_wake(&ust_cmd_queue
.futex
);
2232 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2233 ERR("Register apps socket poll error");
2236 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2245 /* Notify that the registration thread is gone */
2248 if (apps_sock
>= 0) {
2249 ret
= close(apps_sock
);
2259 lttng_fd_put(LTTNG_FD_APPS
, 1);
2261 unlink(config
.apps_unix_sock_path
.value
);
2264 lttng_poll_clean(&events
);
2268 DBG("UST Registration thread cleanup complete");
2271 ERR("Health error occurred in %s", __func__
);
2273 health_unregister(health_sessiond
);
2279 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2280 * exec or it will fails.
2282 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
2285 struct timespec timeout
;
2288 * Make sure we set the readiness flag to 0 because we are NOT ready.
2289 * This access to consumer_thread_is_ready does not need to be
2290 * protected by consumer_data.cond_mutex (yet) since the consumer
2291 * management thread has not been started at this point.
2293 consumer_data
->consumer_thread_is_ready
= 0;
2295 /* Setup pthread condition */
2296 ret
= pthread_condattr_init(&consumer_data
->condattr
);
2299 PERROR("pthread_condattr_init consumer data");
2304 * Set the monotonic clock in order to make sure we DO NOT jump in time
2305 * between the clock_gettime() call and the timedwait call. See bug #324
2306 * for a more details and how we noticed it.
2308 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
2311 PERROR("pthread_condattr_setclock consumer data");
2315 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
2318 PERROR("pthread_cond_init consumer data");
2322 ret
= pthread_create(&consumer_data
->thread
, default_pthread_attr(),
2323 thread_manage_consumer
, consumer_data
);
2326 PERROR("pthread_create consumer");
2331 /* We are about to wait on a pthread condition */
2332 pthread_mutex_lock(&consumer_data
->cond_mutex
);
2334 /* Get time for sem_timedwait absolute timeout */
2335 clock_ret
= lttng_clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2337 * Set the timeout for the condition timed wait even if the clock gettime
2338 * call fails since we might loop on that call and we want to avoid to
2339 * increment the timeout too many times.
2341 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2344 * The following loop COULD be skipped in some conditions so this is why we
2345 * set ret to 0 in order to make sure at least one round of the loop is
2351 * Loop until the condition is reached or when a timeout is reached. Note
2352 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2353 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2354 * possible. This loop does not take any chances and works with both of
2357 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2358 if (clock_ret
< 0) {
2359 PERROR("clock_gettime spawn consumer");
2360 /* Infinite wait for the consumerd thread to be ready */
2361 ret
= pthread_cond_wait(&consumer_data
->cond
,
2362 &consumer_data
->cond_mutex
);
2364 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2365 &consumer_data
->cond_mutex
, &timeout
);
2369 /* Release the pthread condition */
2370 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2374 if (ret
== ETIMEDOUT
) {
2378 * Call has timed out so we kill the kconsumerd_thread and return
2381 ERR("Condition timed out. The consumer thread was never ready."
2383 pth_ret
= pthread_cancel(consumer_data
->thread
);
2385 PERROR("pthread_cancel consumer thread");
2388 PERROR("pthread_cond_wait failed consumer thread");
2390 /* Caller is expecting a negative value on failure. */
2395 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2396 if (consumer_data
->pid
== 0) {
2397 ERR("Consumerd did not start");
2398 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2401 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2410 * Join consumer thread
2412 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2416 /* Consumer pid must be a real one. */
2417 if (consumer_data
->pid
> 0) {
2419 ret
= kill(consumer_data
->pid
, SIGTERM
);
2421 PERROR("Error killing consumer daemon");
2424 return pthread_join(consumer_data
->thread
, &status
);
2431 * Fork and exec a consumer daemon (consumerd).
2433 * Return pid if successful else -1.
2435 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2439 const char *consumer_to_use
;
2440 const char *verbosity
;
2443 DBG("Spawning consumerd");
2450 if (config
.verbose_consumer
) {
2451 verbosity
= "--verbose";
2452 } else if (lttng_opt_quiet
) {
2453 verbosity
= "--quiet";
2458 switch (consumer_data
->type
) {
2459 case LTTNG_CONSUMER_KERNEL
:
2461 * Find out which consumerd to execute. We will first try the
2462 * 64-bit path, then the sessiond's installation directory, and
2463 * fallback on the 32-bit one,
2465 DBG3("Looking for a kernel consumer at these locations:");
2466 DBG3(" 1) %s", config
.consumerd64_bin_path
.value
? : "NULL");
2467 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, DEFAULT_CONSUMERD_FILE
);
2468 DBG3(" 3) %s", config
.consumerd32_bin_path
.value
? : "NULL");
2469 if (stat(config
.consumerd64_bin_path
.value
, &st
) == 0) {
2470 DBG3("Found location #1");
2471 consumer_to_use
= config
.consumerd64_bin_path
.value
;
2472 } else if (stat(INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
, &st
) == 0) {
2473 DBG3("Found location #2");
2474 consumer_to_use
= INSTALL_BIN_PATH
"/" DEFAULT_CONSUMERD_FILE
;
2475 } else if (stat(config
.consumerd32_bin_path
.value
, &st
) == 0) {
2476 DBG3("Found location #3");
2477 consumer_to_use
= config
.consumerd32_bin_path
.value
;
2479 DBG("Could not find any valid consumerd executable");
2483 DBG("Using kernel consumer at: %s", consumer_to_use
);
2484 (void) execl(consumer_to_use
,
2485 "lttng-consumerd", verbosity
, "-k",
2486 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2487 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2488 "--group", config
.tracing_group_name
.value
,
2491 case LTTNG_CONSUMER64_UST
:
2493 if (config
.consumerd64_lib_dir
.value
) {
2498 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
2502 tmplen
= strlen(config
.consumerd64_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
2503 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2508 strcat(tmpnew
, config
.consumerd64_lib_dir
.value
);
2509 if (tmp
[0] != '\0') {
2510 strcat(tmpnew
, ":");
2511 strcat(tmpnew
, tmp
);
2513 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
2520 DBG("Using 64-bit UST consumer at: %s", config
.consumerd64_bin_path
.value
);
2521 (void) execl(config
.consumerd64_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
2522 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2523 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2524 "--group", config
.tracing_group_name
.value
,
2528 case LTTNG_CONSUMER32_UST
:
2530 if (config
.consumerd32_lib_dir
.value
) {
2535 tmp
= lttng_secure_getenv("LD_LIBRARY_PATH");
2539 tmplen
= strlen(config
.consumerd32_lib_dir
.value
) + 1 /* : */ + strlen(tmp
);
2540 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2545 strcat(tmpnew
, config
.consumerd32_lib_dir
.value
);
2546 if (tmp
[0] != '\0') {
2547 strcat(tmpnew
, ":");
2548 strcat(tmpnew
, tmp
);
2550 ret
= setenv("LD_LIBRARY_PATH", tmpnew
, 1);
2557 DBG("Using 32-bit UST consumer at: %s", config
.consumerd32_bin_path
.value
);
2558 (void) execl(config
.consumerd32_bin_path
.value
, "lttng-consumerd", verbosity
, "-u",
2559 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2560 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2561 "--group", config
.tracing_group_name
.value
,
2566 ERR("unknown consumer type");
2570 PERROR("Consumer execl()");
2572 /* Reaching this point, we got a failure on our execl(). */
2574 } else if (pid
> 0) {
2577 PERROR("start consumer fork");
2585 * Spawn the consumerd daemon and session daemon thread.
2587 static int start_consumerd(struct consumer_data
*consumer_data
)
2592 * Set the listen() state on the socket since there is a possible race
2593 * between the exec() of the consumer daemon and this call if place in the
2594 * consumer thread. See bug #366 for more details.
2596 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2601 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2602 if (consumer_data
->pid
!= 0) {
2603 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2607 ret
= spawn_consumerd(consumer_data
);
2609 ERR("Spawning consumerd failed");
2610 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2614 /* Setting up the consumer_data pid */
2615 consumer_data
->pid
= ret
;
2616 DBG2("Consumer pid %d", consumer_data
->pid
);
2617 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2619 DBG2("Spawning consumer control thread");
2620 ret
= spawn_consumer_thread(consumer_data
);
2622 ERR("Fatal error spawning consumer control thread");
2630 /* Cleanup already created sockets on error. */
2631 if (consumer_data
->err_sock
>= 0) {
2634 err
= close(consumer_data
->err_sock
);
2636 PERROR("close consumer data error socket");
2643 * Setup necessary data for kernel tracer action.
2645 static int init_kernel_tracer(void)
2649 /* Modprobe lttng kernel modules */
2650 ret
= modprobe_lttng_control();
2655 /* Open debugfs lttng */
2656 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2657 if (kernel_tracer_fd
< 0) {
2658 DBG("Failed to open %s", module_proc_lttng
);
2662 /* Validate kernel version */
2663 ret
= kernel_validate_version(kernel_tracer_fd
, &kernel_tracer_version
,
2664 &kernel_tracer_abi_version
);
2669 ret
= modprobe_lttng_data();
2674 ret
= kernel_supports_ring_buffer_snapshot_sample_positions(
2681 WARN("Kernel tracer does not support buffer monitoring. "
2682 "The monitoring timer of channels in the kernel domain "
2683 "will be set to 0 (disabled).");
2686 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2690 modprobe_remove_lttng_control();
2691 ret
= close(kernel_tracer_fd
);
2695 kernel_tracer_fd
= -1;
2696 return LTTNG_ERR_KERN_VERSION
;
2699 ret
= close(kernel_tracer_fd
);
2705 modprobe_remove_lttng_control();
2708 WARN("No kernel tracer available");
2709 kernel_tracer_fd
= -1;
2711 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2713 return LTTNG_ERR_KERN_NA
;
2719 * Copy consumer output from the tracing session to the domain session. The
2720 * function also applies the right modification on a per domain basis for the
2721 * trace files destination directory.
2723 * Should *NOT* be called with RCU read-side lock held.
2725 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2728 const char *dir_name
;
2729 struct consumer_output
*consumer
;
2732 assert(session
->consumer
);
2735 case LTTNG_DOMAIN_KERNEL
:
2736 DBG3("Copying tracing session consumer output in kernel session");
2738 * XXX: We should audit the session creation and what this function
2739 * does "extra" in order to avoid a destroy since this function is used
2740 * in the domain session creation (kernel and ust) only. Same for UST
2743 if (session
->kernel_session
->consumer
) {
2744 consumer_output_put(session
->kernel_session
->consumer
);
2746 session
->kernel_session
->consumer
=
2747 consumer_copy_output(session
->consumer
);
2748 /* Ease our life a bit for the next part */
2749 consumer
= session
->kernel_session
->consumer
;
2750 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2752 case LTTNG_DOMAIN_JUL
:
2753 case LTTNG_DOMAIN_LOG4J
:
2754 case LTTNG_DOMAIN_PYTHON
:
2755 case LTTNG_DOMAIN_UST
:
2756 DBG3("Copying tracing session consumer output in UST session");
2757 if (session
->ust_session
->consumer
) {
2758 consumer_output_put(session
->ust_session
->consumer
);
2760 session
->ust_session
->consumer
=
2761 consumer_copy_output(session
->consumer
);
2762 /* Ease our life a bit for the next part */
2763 consumer
= session
->ust_session
->consumer
;
2764 dir_name
= DEFAULT_UST_TRACE_DIR
;
2767 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2771 /* Append correct directory to subdir */
2772 strncat(consumer
->subdir
, dir_name
,
2773 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2774 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2783 * Create an UST session and add it to the session ust list.
2785 * Should *NOT* be called with RCU read-side lock held.
2787 static int create_ust_session(struct ltt_session
*session
,
2788 struct lttng_domain
*domain
)
2791 struct ltt_ust_session
*lus
= NULL
;
2795 assert(session
->consumer
);
2797 switch (domain
->type
) {
2798 case LTTNG_DOMAIN_JUL
:
2799 case LTTNG_DOMAIN_LOG4J
:
2800 case LTTNG_DOMAIN_PYTHON
:
2801 case LTTNG_DOMAIN_UST
:
2804 ERR("Unknown UST domain on create session %d", domain
->type
);
2805 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2809 DBG("Creating UST session");
2811 lus
= trace_ust_create_session(session
->id
);
2813 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2817 lus
->uid
= session
->uid
;
2818 lus
->gid
= session
->gid
;
2819 lus
->output_traces
= session
->output_traces
;
2820 lus
->snapshot_mode
= session
->snapshot_mode
;
2821 lus
->live_timer_interval
= session
->live_timer
;
2822 session
->ust_session
= lus
;
2823 if (session
->shm_path
[0]) {
2824 strncpy(lus
->root_shm_path
, session
->shm_path
,
2825 sizeof(lus
->root_shm_path
));
2826 lus
->root_shm_path
[sizeof(lus
->root_shm_path
) - 1] = '\0';
2827 strncpy(lus
->shm_path
, session
->shm_path
,
2828 sizeof(lus
->shm_path
));
2829 lus
->shm_path
[sizeof(lus
->shm_path
) - 1] = '\0';
2830 strncat(lus
->shm_path
, "/ust",
2831 sizeof(lus
->shm_path
) - strlen(lus
->shm_path
) - 1);
2833 /* Copy session output to the newly created UST session */
2834 ret
= copy_session_consumer(domain
->type
, session
);
2835 if (ret
!= LTTNG_OK
) {
2843 session
->ust_session
= NULL
;
2848 * Create a kernel tracer session then create the default channel.
2850 static int create_kernel_session(struct ltt_session
*session
)
2854 DBG("Creating kernel session");
2856 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2858 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2862 /* Code flow safety */
2863 assert(session
->kernel_session
);
2865 /* Copy session output to the newly created Kernel session */
2866 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2867 if (ret
!= LTTNG_OK
) {
2871 session
->kernel_session
->uid
= session
->uid
;
2872 session
->kernel_session
->gid
= session
->gid
;
2873 session
->kernel_session
->output_traces
= session
->output_traces
;
2874 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2879 trace_kernel_destroy_session(session
->kernel_session
);
2880 session
->kernel_session
= NULL
;
2885 * Count number of session permitted by uid/gid.
2887 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2890 struct ltt_session
*session
;
2892 DBG("Counting number of available session for UID %d GID %d",
2894 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2896 * Only list the sessions the user can control.
2898 if (!session_access_ok(session
, uid
, gid
)) {
2907 * Check if the current kernel tracer supports the session rotation feature.
2908 * Return 1 if it does, 0 otherwise.
2910 static int check_rotate_compatible(void)
2914 if (kernel_tracer_version
.major
!= 2 || kernel_tracer_version
.minor
< 11) {
2915 DBG("Kernel tracer version is not compatible with the rotation feature");
2923 * Process the command requested by the lttng client within the command
2924 * context structure. This function make sure that the return structure (llm)
2925 * is set and ready for transmission before returning.
2927 * Return any error encountered or 0 for success.
2929 * "sock" is only used for special-case var. len data.
2931 * Should *NOT* be called with RCU read-side lock held.
2933 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2937 int need_tracing_session
= 1;
2940 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2942 assert(!rcu_read_ongoing());
2946 switch (cmd_ctx
->lsm
->cmd_type
) {
2947 case LTTNG_CREATE_SESSION
:
2948 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2949 case LTTNG_CREATE_SESSION_LIVE
:
2950 case LTTNG_DESTROY_SESSION
:
2951 case LTTNG_LIST_SESSIONS
:
2952 case LTTNG_LIST_DOMAINS
:
2953 case LTTNG_START_TRACE
:
2954 case LTTNG_STOP_TRACE
:
2955 case LTTNG_DATA_PENDING
:
2956 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2957 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2958 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2959 case LTTNG_SNAPSHOT_RECORD
:
2960 case LTTNG_SAVE_SESSION
:
2961 case LTTNG_SET_SESSION_SHM_PATH
:
2962 case LTTNG_REGENERATE_METADATA
:
2963 case LTTNG_REGENERATE_STATEDUMP
:
2964 case LTTNG_REGISTER_TRIGGER
:
2965 case LTTNG_UNREGISTER_TRIGGER
:
2966 case LTTNG_ROTATE_SESSION
:
2967 case LTTNG_ROTATION_GET_INFO
:
2968 case LTTNG_SESSION_GET_CURRENT_OUTPUT
:
2975 if (config
.no_kernel
&& need_domain
2976 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2978 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2980 ret
= LTTNG_ERR_KERN_NA
;
2985 /* Deny register consumer if we already have a spawned consumer. */
2986 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2987 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2988 if (kconsumer_data
.pid
> 0) {
2989 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2990 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2993 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2997 * Check for command that don't needs to allocate a returned payload. We do
2998 * this here so we don't have to make the call for no payload at each
3001 switch(cmd_ctx
->lsm
->cmd_type
) {
3002 case LTTNG_LIST_SESSIONS
:
3003 case LTTNG_LIST_TRACEPOINTS
:
3004 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3005 case LTTNG_LIST_DOMAINS
:
3006 case LTTNG_LIST_CHANNELS
:
3007 case LTTNG_LIST_EVENTS
:
3008 case LTTNG_LIST_SYSCALLS
:
3009 case LTTNG_LIST_TRACKER_PIDS
:
3010 case LTTNG_DATA_PENDING
:
3011 case LTTNG_ROTATE_SESSION
:
3012 case LTTNG_ROTATION_GET_INFO
:
3015 /* Setup lttng message with no payload */
3016 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0);
3018 /* This label does not try to unlock the session */
3019 goto init_setup_error
;
3023 /* Commands that DO NOT need a session. */
3024 switch (cmd_ctx
->lsm
->cmd_type
) {
3025 case LTTNG_CREATE_SESSION
:
3026 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3027 case LTTNG_CREATE_SESSION_LIVE
:
3028 case LTTNG_LIST_SESSIONS
:
3029 case LTTNG_LIST_TRACEPOINTS
:
3030 case LTTNG_LIST_SYSCALLS
:
3031 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3032 case LTTNG_SAVE_SESSION
:
3033 case LTTNG_REGISTER_TRIGGER
:
3034 case LTTNG_UNREGISTER_TRIGGER
:
3035 need_tracing_session
= 0;
3038 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3040 * We keep the session list lock across _all_ commands
3041 * for now, because the per-session lock does not
3042 * handle teardown properly.
3044 session_lock_list();
3045 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3046 if (cmd_ctx
->session
== NULL
) {
3047 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
3050 /* Acquire lock for the session */
3051 session_lock(cmd_ctx
->session
);
3057 * Commands that need a valid session but should NOT create one if none
3058 * exists. Instead of creating one and destroying it when the command is
3059 * handled, process that right before so we save some round trip in useless
3062 switch (cmd_ctx
->lsm
->cmd_type
) {
3063 case LTTNG_DISABLE_CHANNEL
:
3064 case LTTNG_DISABLE_EVENT
:
3065 switch (cmd_ctx
->lsm
->domain
.type
) {
3066 case LTTNG_DOMAIN_KERNEL
:
3067 if (!cmd_ctx
->session
->kernel_session
) {
3068 ret
= LTTNG_ERR_NO_CHANNEL
;
3072 case LTTNG_DOMAIN_JUL
:
3073 case LTTNG_DOMAIN_LOG4J
:
3074 case LTTNG_DOMAIN_PYTHON
:
3075 case LTTNG_DOMAIN_UST
:
3076 if (!cmd_ctx
->session
->ust_session
) {
3077 ret
= LTTNG_ERR_NO_CHANNEL
;
3082 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3094 * Check domain type for specific "pre-action".
3096 switch (cmd_ctx
->lsm
->domain
.type
) {
3097 case LTTNG_DOMAIN_KERNEL
:
3099 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
3103 /* Kernel tracer check */
3104 if (kernel_tracer_fd
== -1) {
3105 /* Basically, load kernel tracer modules */
3106 ret
= init_kernel_tracer();
3112 /* Consumer is in an ERROR state. Report back to client */
3113 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
3114 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3118 /* Need a session for kernel command */
3119 if (need_tracing_session
) {
3120 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3121 ret
= create_kernel_session(cmd_ctx
->session
);
3123 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
3128 /* Start the kernel consumer daemon */
3129 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3130 if (kconsumer_data
.pid
== 0 &&
3131 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3132 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3133 ret
= start_consumerd(&kconsumer_data
);
3135 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3138 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
3140 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3144 * The consumer was just spawned so we need to add the socket to
3145 * the consumer output of the session if exist.
3147 ret
= consumer_create_socket(&kconsumer_data
,
3148 cmd_ctx
->session
->kernel_session
->consumer
);
3155 case LTTNG_DOMAIN_JUL
:
3156 case LTTNG_DOMAIN_LOG4J
:
3157 case LTTNG_DOMAIN_PYTHON
:
3158 case LTTNG_DOMAIN_UST
:
3160 if (!ust_app_supported()) {
3161 ret
= LTTNG_ERR_NO_UST
;
3164 /* Consumer is in an ERROR state. Report back to client */
3165 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
3166 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3170 if (need_tracing_session
) {
3171 /* Create UST session if none exist. */
3172 if (cmd_ctx
->session
->ust_session
== NULL
) {
3173 ret
= create_ust_session(cmd_ctx
->session
,
3174 &cmd_ctx
->lsm
->domain
);
3175 if (ret
!= LTTNG_OK
) {
3180 /* Start the UST consumer daemons */
3182 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3183 if (config
.consumerd64_bin_path
.value
&&
3184 ustconsumer64_data
.pid
== 0 &&
3185 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3186 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3187 ret
= start_consumerd(&ustconsumer64_data
);
3189 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
3190 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
3194 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
3195 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3197 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3201 * Setup socket for consumer 64 bit. No need for atomic access
3202 * since it was set above and can ONLY be set in this thread.
3204 ret
= consumer_create_socket(&ustconsumer64_data
,
3205 cmd_ctx
->session
->ust_session
->consumer
);
3211 pthread_mutex_lock(&ustconsumer32_data
.pid_mutex
);
3212 if (config
.consumerd32_bin_path
.value
&&
3213 ustconsumer32_data
.pid
== 0 &&
3214 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3215 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3216 ret
= start_consumerd(&ustconsumer32_data
);
3218 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
3219 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
3223 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
3224 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3226 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3230 * Setup socket for consumer 64 bit. No need for atomic access
3231 * since it was set above and can ONLY be set in this thread.
3233 ret
= consumer_create_socket(&ustconsumer32_data
,
3234 cmd_ctx
->session
->ust_session
->consumer
);
3246 /* Validate consumer daemon state when start/stop trace command */
3247 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
3248 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
3249 switch (cmd_ctx
->lsm
->domain
.type
) {
3250 case LTTNG_DOMAIN_NONE
:
3252 case LTTNG_DOMAIN_JUL
:
3253 case LTTNG_DOMAIN_LOG4J
:
3254 case LTTNG_DOMAIN_PYTHON
:
3255 case LTTNG_DOMAIN_UST
:
3256 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
3257 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3261 case LTTNG_DOMAIN_KERNEL
:
3262 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
3263 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3268 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3274 * Check that the UID or GID match that of the tracing session.
3275 * The root user can interact with all sessions.
3277 if (need_tracing_session
) {
3278 if (!session_access_ok(cmd_ctx
->session
,
3279 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3280 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3281 ret
= LTTNG_ERR_EPERM
;
3287 * Send relayd information to consumer as soon as we have a domain and a
3290 if (cmd_ctx
->session
&& need_domain
) {
3292 * Setup relayd if not done yet. If the relayd information was already
3293 * sent to the consumer, this call will gracefully return.
3295 ret
= cmd_setup_relayd(cmd_ctx
->session
);
3296 if (ret
!= LTTNG_OK
) {
3301 /* Process by command type */
3302 switch (cmd_ctx
->lsm
->cmd_type
) {
3303 case LTTNG_ADD_CONTEXT
:
3306 * An LTTNG_ADD_CONTEXT command might have a supplementary
3307 * payload if the context being added is an application context.
3309 if (cmd_ctx
->lsm
->u
.context
.ctx
.ctx
==
3310 LTTNG_EVENT_CONTEXT_APP_CONTEXT
) {
3311 char *provider_name
= NULL
, *context_name
= NULL
;
3312 size_t provider_name_len
=
3313 cmd_ctx
->lsm
->u
.context
.provider_name_len
;
3314 size_t context_name_len
=
3315 cmd_ctx
->lsm
->u
.context
.context_name_len
;
3317 if (provider_name_len
== 0 || context_name_len
== 0) {
3319 * Application provider and context names MUST
3322 ret
= -LTTNG_ERR_INVALID
;
3326 provider_name
= zmalloc(provider_name_len
+ 1);
3327 if (!provider_name
) {
3328 ret
= -LTTNG_ERR_NOMEM
;
3331 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
=
3334 context_name
= zmalloc(context_name_len
+ 1);
3335 if (!context_name
) {
3336 ret
= -LTTNG_ERR_NOMEM
;
3337 goto error_add_context
;
3339 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
=
3342 ret
= lttcomm_recv_unix_sock(sock
, provider_name
,
3345 goto error_add_context
;
3348 ret
= lttcomm_recv_unix_sock(sock
, context_name
,
3351 goto error_add_context
;
3356 * cmd_add_context assumes ownership of the provider and context
3359 ret
= cmd_add_context(cmd_ctx
->session
,
3360 cmd_ctx
->lsm
->domain
.type
,
3361 cmd_ctx
->lsm
->u
.context
.channel_name
,
3362 &cmd_ctx
->lsm
->u
.context
.ctx
,
3363 kernel_poll_pipe
[1]);
3365 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
= NULL
;
3366 cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
= NULL
;
3368 free(cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.provider_name
);
3369 free(cmd_ctx
->lsm
->u
.context
.ctx
.u
.app_ctx
.ctx_name
);
3375 case LTTNG_DISABLE_CHANNEL
:
3377 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3378 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3381 case LTTNG_DISABLE_EVENT
:
3385 * FIXME: handle filter; for now we just receive the filter's
3386 * bytecode along with the filter expression which are sent by
3387 * liblttng-ctl and discard them.
3389 * This fixes an issue where the client may block while sending
3390 * the filter payload and encounter an error because the session
3391 * daemon closes the socket without ever handling this data.
3393 size_t count
= cmd_ctx
->lsm
->u
.disable
.expression_len
+
3394 cmd_ctx
->lsm
->u
.disable
.bytecode_len
;
3397 char data
[LTTNG_FILTER_MAX_LEN
];
3399 DBG("Discarding disable event command payload of size %zu", count
);
3401 ret
= lttcomm_recv_unix_sock(sock
, data
,
3402 count
> sizeof(data
) ? sizeof(data
) : count
);
3407 count
-= (size_t) ret
;
3410 /* FIXME: passing packed structure to non-packed pointer */
3411 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3412 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3413 &cmd_ctx
->lsm
->u
.disable
.event
);
3416 case LTTNG_ENABLE_CHANNEL
:
3418 cmd_ctx
->lsm
->u
.channel
.chan
.attr
.extended
.ptr
=
3419 (struct lttng_channel_extended
*) &cmd_ctx
->lsm
->u
.channel
.extended
;
3420 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3421 &cmd_ctx
->lsm
->u
.channel
.chan
,
3422 kernel_poll_pipe
[1]);
3425 case LTTNG_TRACK_PID
:
3427 ret
= cmd_track_pid(cmd_ctx
->session
,
3428 cmd_ctx
->lsm
->domain
.type
,
3429 cmd_ctx
->lsm
->u
.pid_tracker
.pid
);
3432 case LTTNG_UNTRACK_PID
:
3434 ret
= cmd_untrack_pid(cmd_ctx
->session
,
3435 cmd_ctx
->lsm
->domain
.type
,
3436 cmd_ctx
->lsm
->u
.pid_tracker
.pid
);
3439 case LTTNG_ENABLE_EVENT
:
3441 struct lttng_event_exclusion
*exclusion
= NULL
;
3442 struct lttng_filter_bytecode
*bytecode
= NULL
;
3443 char *filter_expression
= NULL
;
3445 /* Handle exclusion events and receive it from the client. */
3446 if (cmd_ctx
->lsm
->u
.enable
.exclusion_count
> 0) {
3447 size_t count
= cmd_ctx
->lsm
->u
.enable
.exclusion_count
;
3449 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
3450 (count
* LTTNG_SYMBOL_NAME_LEN
));
3452 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
3456 DBG("Receiving var len exclusion event list from client ...");
3457 exclusion
->count
= count
;
3458 ret
= lttcomm_recv_unix_sock(sock
, exclusion
->names
,
3459 count
* LTTNG_SYMBOL_NAME_LEN
);
3461 DBG("Nothing recv() from client var len data... continuing");
3464 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
3469 /* Get filter expression from client. */
3470 if (cmd_ctx
->lsm
->u
.enable
.expression_len
> 0) {
3471 size_t expression_len
=
3472 cmd_ctx
->lsm
->u
.enable
.expression_len
;
3474 if (expression_len
> LTTNG_FILTER_MAX_LEN
) {
3475 ret
= LTTNG_ERR_FILTER_INVAL
;
3480 filter_expression
= zmalloc(expression_len
);
3481 if (!filter_expression
) {
3483 ret
= LTTNG_ERR_FILTER_NOMEM
;
3487 /* Receive var. len. data */
3488 DBG("Receiving var len filter's expression from client ...");
3489 ret
= lttcomm_recv_unix_sock(sock
, filter_expression
,
3492 DBG("Nothing recv() from client car len data... continuing");
3494 free(filter_expression
);
3496 ret
= LTTNG_ERR_FILTER_INVAL
;
3501 /* Handle filter and get bytecode from client. */
3502 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> 0) {
3503 size_t bytecode_len
= cmd_ctx
->lsm
->u
.enable
.bytecode_len
;
3505 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3506 ret
= LTTNG_ERR_FILTER_INVAL
;
3507 free(filter_expression
);
3512 bytecode
= zmalloc(bytecode_len
);
3514 free(filter_expression
);
3516 ret
= LTTNG_ERR_FILTER_NOMEM
;
3520 /* Receive var. len. data */
3521 DBG("Receiving var len filter's bytecode from client ...");
3522 ret
= lttcomm_recv_unix_sock(sock
, bytecode
, bytecode_len
);
3524 DBG("Nothing recv() from client car len data... continuing");
3526 free(filter_expression
);
3529 ret
= LTTNG_ERR_FILTER_INVAL
;
3533 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
3534 free(filter_expression
);
3537 ret
= LTTNG_ERR_FILTER_INVAL
;
3542 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3543 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3544 &cmd_ctx
->lsm
->u
.enable
.event
,
3545 filter_expression
, bytecode
, exclusion
,
3546 kernel_poll_pipe
[1]);
3549 case LTTNG_LIST_TRACEPOINTS
:
3551 struct lttng_event
*events
;
3554 session_lock_list();
3555 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3556 session_unlock_list();
3557 if (nb_events
< 0) {
3558 /* Return value is a negative lttng_error_code. */
3564 * Setup lttng message with payload size set to the event list size in
3565 * bytes and then copy list into the llm payload.
3567 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
3568 sizeof(struct lttng_event
) * nb_events
);
3578 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3580 struct lttng_event_field
*fields
;
3583 session_lock_list();
3584 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
3586 session_unlock_list();
3587 if (nb_fields
< 0) {
3588 /* Return value is a negative lttng_error_code. */
3594 * Setup lttng message with payload size set to the event list size in
3595 * bytes and then copy list into the llm payload.
3597 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, fields
,
3598 sizeof(struct lttng_event_field
) * nb_fields
);
3608 case LTTNG_LIST_SYSCALLS
:
3610 struct lttng_event
*events
;
3613 nb_events
= cmd_list_syscalls(&events
);
3614 if (nb_events
< 0) {
3615 /* Return value is a negative lttng_error_code. */
3621 * Setup lttng message with payload size set to the event list size in
3622 * bytes and then copy list into the llm payload.
3624 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, events
,
3625 sizeof(struct lttng_event
) * nb_events
);
3635 case LTTNG_LIST_TRACKER_PIDS
:
3637 int32_t *pids
= NULL
;
3640 nr_pids
= cmd_list_tracker_pids(cmd_ctx
->session
,
3641 cmd_ctx
->lsm
->domain
.type
, &pids
);
3643 /* Return value is a negative lttng_error_code. */
3649 * Setup lttng message with payload size set to the event list size in
3650 * bytes and then copy list into the llm payload.
3652 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, pids
,
3653 sizeof(int32_t) * nr_pids
);
3663 case LTTNG_SET_CONSUMER_URI
:
3666 struct lttng_uri
*uris
;
3668 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3669 len
= nb_uri
* sizeof(struct lttng_uri
);
3672 ret
= LTTNG_ERR_INVALID
;
3676 uris
= zmalloc(len
);
3678 ret
= LTTNG_ERR_FATAL
;
3682 /* Receive variable len data */
3683 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3684 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3686 DBG("No URIs received from client... continuing");
3688 ret
= LTTNG_ERR_SESSION_FAIL
;
3693 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
3695 if (ret
!= LTTNG_OK
) {
3702 case LTTNG_START_TRACE
:
3704 ret
= cmd_start_trace(cmd_ctx
->session
);
3707 case LTTNG_STOP_TRACE
:
3709 ret
= cmd_stop_trace(cmd_ctx
->session
);
3712 case LTTNG_CREATE_SESSION
:
3715 struct lttng_uri
*uris
= NULL
;
3717 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3718 len
= nb_uri
* sizeof(struct lttng_uri
);
3721 uris
= zmalloc(len
);
3723 ret
= LTTNG_ERR_FATAL
;
3727 /* Receive variable len data */
3728 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3729 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3731 DBG("No URIs received from client... continuing");
3733 ret
= LTTNG_ERR_SESSION_FAIL
;
3738 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3739 DBG("Creating session with ONE network URI is a bad call");
3740 ret
= LTTNG_ERR_SESSION_FAIL
;
3746 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3747 &cmd_ctx
->creds
, 0);
3753 case LTTNG_DESTROY_SESSION
:
3755 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3757 /* Set session to NULL so we do not unlock it after free. */
3758 cmd_ctx
->session
= NULL
;
3761 case LTTNG_LIST_DOMAINS
:
3764 struct lttng_domain
*domains
= NULL
;
3766 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3768 /* Return value is a negative lttng_error_code. */
3773 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, domains
,
3774 nb_dom
* sizeof(struct lttng_domain
));
3784 case LTTNG_LIST_CHANNELS
:
3786 ssize_t payload_size
;
3787 struct lttng_channel
*channels
= NULL
;
3789 payload_size
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3790 cmd_ctx
->session
, &channels
);
3791 if (payload_size
< 0) {
3792 /* Return value is a negative lttng_error_code. */
3793 ret
= -payload_size
;
3797 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, channels
,
3808 case LTTNG_LIST_EVENTS
:
3811 struct lttng_event
*events
= NULL
;
3812 struct lttcomm_event_command_header cmd_header
;
3815 memset(&cmd_header
, 0, sizeof(cmd_header
));
3816 /* Extended infos are included at the end of events */
3817 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
,
3818 cmd_ctx
->session
, cmd_ctx
->lsm
->u
.list
.channel_name
,
3819 &events
, &total_size
);
3822 /* Return value is a negative lttng_error_code. */
3827 cmd_header
.nb_events
= nb_event
;
3828 ret
= setup_lttng_msg(cmd_ctx
, events
, total_size
,
3829 &cmd_header
, sizeof(cmd_header
));
3839 case LTTNG_LIST_SESSIONS
:
3841 unsigned int nr_sessions
;
3842 void *sessions_payload
;
3845 session_lock_list();
3846 nr_sessions
= lttng_sessions_count(
3847 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3848 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3849 payload_len
= sizeof(struct lttng_session
) * nr_sessions
;
3850 sessions_payload
= zmalloc(payload_len
);
3852 if (!sessions_payload
) {
3853 session_unlock_list();
3858 cmd_list_lttng_sessions(sessions_payload
,
3859 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3860 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3861 session_unlock_list();
3863 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, sessions_payload
,
3865 free(sessions_payload
);
3874 case LTTNG_REGISTER_CONSUMER
:
3876 struct consumer_data
*cdata
;
3878 switch (cmd_ctx
->lsm
->domain
.type
) {
3879 case LTTNG_DOMAIN_KERNEL
:
3880 cdata
= &kconsumer_data
;
3883 ret
= LTTNG_ERR_UND
;
3887 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3888 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3891 case LTTNG_DATA_PENDING
:
3894 uint8_t pending_ret_byte
;
3896 pending_ret
= cmd_data_pending(cmd_ctx
->session
);
3901 * This function may returns 0 or 1 to indicate whether or not
3902 * there is data pending. In case of error, it should return an
3903 * LTTNG_ERR code. However, some code paths may still return
3904 * a nondescript error code, which we handle by returning an
3907 if (pending_ret
== 0 || pending_ret
== 1) {
3909 * ret will be set to LTTNG_OK at the end of
3912 } else if (pending_ret
< 0) {
3913 ret
= LTTNG_ERR_UNK
;
3920 pending_ret_byte
= (uint8_t) pending_ret
;
3922 /* 1 byte to return whether or not data is pending */
3923 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
,
3924 &pending_ret_byte
, 1);
3933 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3935 struct lttcomm_lttng_output_id reply
;
3937 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3938 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3939 if (ret
!= LTTNG_OK
) {
3943 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &reply
,
3949 /* Copy output list into message payload */
3953 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3955 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3956 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3959 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3962 struct lttng_snapshot_output
*outputs
= NULL
;
3964 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3965 if (nb_output
< 0) {
3970 assert((nb_output
> 0 && outputs
) || nb_output
== 0);
3971 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, outputs
,
3972 nb_output
* sizeof(struct lttng_snapshot_output
));
3982 case LTTNG_SNAPSHOT_RECORD
:
3984 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3985 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3986 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3989 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3992 struct lttng_uri
*uris
= NULL
;
3994 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3995 len
= nb_uri
* sizeof(struct lttng_uri
);
3998 uris
= zmalloc(len
);
4000 ret
= LTTNG_ERR_FATAL
;
4004 /* Receive variable len data */
4005 DBG("Waiting for %zu URIs from client ...", nb_uri
);
4006 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
4008 DBG("No URIs received from client... continuing");
4010 ret
= LTTNG_ERR_SESSION_FAIL
;
4015 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
4016 DBG("Creating session with ONE network URI is a bad call");
4017 ret
= LTTNG_ERR_SESSION_FAIL
;
4023 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
4024 nb_uri
, &cmd_ctx
->creds
);
4028 case LTTNG_CREATE_SESSION_LIVE
:
4031 struct lttng_uri
*uris
= NULL
;
4033 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
4034 len
= nb_uri
* sizeof(struct lttng_uri
);
4037 uris
= zmalloc(len
);
4039 ret
= LTTNG_ERR_FATAL
;
4043 /* Receive variable len data */
4044 DBG("Waiting for %zu URIs from client ...", nb_uri
);
4045 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
4047 DBG("No URIs received from client... continuing");
4049 ret
= LTTNG_ERR_SESSION_FAIL
;
4054 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
4055 DBG("Creating session with ONE network URI is a bad call");
4056 ret
= LTTNG_ERR_SESSION_FAIL
;
4062 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
4063 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
4067 case LTTNG_SAVE_SESSION
:
4069 ret
= cmd_save_sessions(&cmd_ctx
->lsm
->u
.save_session
.attr
,
4073 case LTTNG_SET_SESSION_SHM_PATH
:
4075 ret
= cmd_set_session_shm_path(cmd_ctx
->session
,
4076 cmd_ctx
->lsm
->u
.set_shm_path
.shm_path
);
4079 case LTTNG_REGENERATE_METADATA
:
4081 ret
= cmd_regenerate_metadata(cmd_ctx
->session
);
4084 case LTTNG_REGENERATE_STATEDUMP
:
4086 ret
= cmd_regenerate_statedump(cmd_ctx
->session
);
4089 case LTTNG_REGISTER_TRIGGER
:
4091 ret
= cmd_register_trigger(cmd_ctx
, sock
,
4092 notification_thread_handle
);
4095 case LTTNG_UNREGISTER_TRIGGER
:
4097 ret
= cmd_unregister_trigger(cmd_ctx
, sock
,
4098 notification_thread_handle
);
4101 case LTTNG_ROTATE_SESSION
:
4103 struct lttng_rotate_session_return rotate_return
;
4105 DBG("Client rotate session \"%s\"", cmd_ctx
->session
->name
);
4107 memset(&rotate_return
, 0, sizeof(rotate_return
));
4108 if (cmd_ctx
->session
->kernel_session
&& !check_rotate_compatible()) {
4109 DBG("Kernel tracer version is not compatible with the rotation feature");
4110 ret
= LTTNG_ERR_ROTATION_WRONG_VERSION
;
4114 ret
= cmd_rotate_session(cmd_ctx
->session
, &rotate_return
);
4120 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &rotate_return
,
4121 sizeof(rotate_return
));
4130 case LTTNG_ROTATION_GET_INFO
:
4132 struct lttng_rotation_get_info_return get_info_return
;
4134 memset(&get_info_return
, 0, sizeof(get_info_return
));
4135 ret
= cmd_rotate_get_info(cmd_ctx
->session
, &get_info_return
,
4136 cmd_ctx
->lsm
->u
.get_rotation_info
.rotation_id
);
4142 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &get_info_return
,
4143 sizeof(get_info_return
));
4152 case LTTNG_SESSION_GET_CURRENT_OUTPUT
:
4154 struct lttng_session_get_current_output_return output_return
;
4156 memset(&output_return
, 0, sizeof(output_return
));
4157 ret
= cmd_session_get_current_output(cmd_ctx
->session
,
4164 ret
= setup_lttng_msg_no_cmd_header(cmd_ctx
, &output_return
,
4165 sizeof(output_return
));
4175 ret
= LTTNG_ERR_UND
;
4180 if (cmd_ctx
->llm
== NULL
) {
4181 DBG("Missing llm structure. Allocating one.");
4182 if (setup_lttng_msg_no_cmd_header(cmd_ctx
, NULL
, 0) < 0) {
4186 /* Set return code */
4187 cmd_ctx
->llm
->ret_code
= ret
;
4189 if (cmd_ctx
->session
) {
4190 session_unlock(cmd_ctx
->session
);
4192 if (need_tracing_session
) {
4193 session_unlock_list();
4196 assert(!rcu_read_ongoing());
4201 * Thread managing health check socket.
4203 static void *thread_manage_health(void *data
)
4205 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
4206 uint32_t revents
, nb_fd
;
4207 struct lttng_poll_event events
;
4208 struct health_comm_msg msg
;
4209 struct health_comm_reply reply
;
4211 DBG("[thread] Manage health check started");
4213 rcu_register_thread();
4215 /* We might hit an error path before this is created. */
4216 lttng_poll_init(&events
);
4218 /* Create unix socket */
4219 sock
= lttcomm_create_unix_sock(config
.health_unix_sock_path
.value
);
4221 ERR("Unable to create health check Unix socket");
4226 /* lttng health client socket path permissions */
4227 ret
= chown(config
.health_unix_sock_path
.value
, 0,
4228 utils_get_group_id(config
.tracing_group_name
.value
));
4230 ERR("Unable to set group on %s", config
.health_unix_sock_path
.value
);
4235 ret
= chmod(config
.health_unix_sock_path
.value
,
4236 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4238 ERR("Unable to set permissions on %s", config
.health_unix_sock_path
.value
);
4245 * Set the CLOEXEC flag. Return code is useless because either way, the
4248 (void) utils_set_fd_cloexec(sock
);
4250 ret
= lttcomm_listen_unix_sock(sock
);
4256 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4257 * more will be added to this poll set.
4259 ret
= sessiond_set_thread_pollset(&events
, 2);
4264 /* Add the application registration socket */
4265 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
4270 sessiond_notify_ready();
4273 DBG("Health check ready");
4275 /* Inifinite blocking call, waiting for transmission */
4277 ret
= lttng_poll_wait(&events
, -1);
4280 * Restart interrupted system call.
4282 if (errno
== EINTR
) {
4290 for (i
= 0; i
< nb_fd
; i
++) {
4291 /* Fetch once the poll data */
4292 revents
= LTTNG_POLL_GETEV(&events
, i
);
4293 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4296 /* No activity for this FD (poll implementation). */
4300 /* Thread quit pipe has been closed. Killing thread. */
4301 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4307 /* Event on the registration socket */
4308 if (pollfd
== sock
) {
4309 if (revents
& LPOLLIN
) {
4311 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4312 ERR("Health socket poll error");
4315 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4321 new_sock
= lttcomm_accept_unix_sock(sock
);
4327 * Set the CLOEXEC flag. Return code is useless because either way, the
4330 (void) utils_set_fd_cloexec(new_sock
);
4332 DBG("Receiving data from client for health...");
4333 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
4335 DBG("Nothing recv() from client... continuing");
4336 ret
= close(new_sock
);
4343 rcu_thread_online();
4345 memset(&reply
, 0, sizeof(reply
));
4346 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
4348 * health_check_state returns 0 if health is
4351 if (!health_check_state(health_sessiond
, i
)) {
4352 reply
.ret_code
|= 1ULL << i
;
4356 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
4358 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
4360 ERR("Failed to send health data back to client");
4363 /* End of transmission */
4364 ret
= close(new_sock
);
4373 ERR("Health error occurred in %s", __func__
);
4375 DBG("Health check thread dying");
4376 unlink(config
.health_unix_sock_path
.value
);
4384 lttng_poll_clean(&events
);
4386 rcu_unregister_thread();
4391 * This thread manage all clients request using the unix client socket for
4394 static void *thread_manage_clients(void *data
)
4396 int sock
= -1, ret
, i
, pollfd
, err
= -1;
4398 uint32_t revents
, nb_fd
;
4399 struct command_ctx
*cmd_ctx
= NULL
;
4400 struct lttng_poll_event events
;
4402 DBG("[thread] Manage client started");
4404 rcu_register_thread();
4406 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
4408 health_code_update();
4410 ret
= lttcomm_listen_unix_sock(client_sock
);
4416 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4417 * more will be added to this poll set.
4419 ret
= sessiond_set_thread_pollset(&events
, 2);
4421 goto error_create_poll
;
4424 /* Add the application registration socket */
4425 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
4430 sessiond_notify_ready();
4431 ret
= sem_post(&load_info
->message_thread_ready
);
4433 PERROR("sem_post message_thread_ready");
4437 /* This testpoint is after we signal readiness to the parent. */
4438 if (testpoint(sessiond_thread_manage_clients
)) {
4442 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
4446 health_code_update();
4449 DBG("Accepting client command ...");
4451 /* Inifinite blocking call, waiting for transmission */
4453 health_poll_entry();
4454 ret
= lttng_poll_wait(&events
, -1);
4458 * Restart interrupted system call.
4460 if (errno
== EINTR
) {
4468 for (i
= 0; i
< nb_fd
; i
++) {
4469 /* Fetch once the poll data */
4470 revents
= LTTNG_POLL_GETEV(&events
, i
);
4471 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4473 health_code_update();
4476 /* No activity for this FD (poll implementation). */
4480 /* Thread quit pipe has been closed. Killing thread. */
4481 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4487 /* Event on the registration socket */
4488 if (pollfd
== client_sock
) {
4489 if (revents
& LPOLLIN
) {
4491 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4492 ERR("Client socket poll error");
4495 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4501 DBG("Wait for client response");
4503 health_code_update();
4505 sock
= lttcomm_accept_unix_sock(client_sock
);
4511 * Set the CLOEXEC flag. Return code is useless because either way, the
4514 (void) utils_set_fd_cloexec(sock
);
4516 /* Set socket option for credentials retrieval */
4517 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
4522 /* Allocate context command to process the client request */
4523 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
4524 if (cmd_ctx
== NULL
) {
4525 PERROR("zmalloc cmd_ctx");
4529 /* Allocate data buffer for reception */
4530 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
4531 if (cmd_ctx
->lsm
== NULL
) {
4532 PERROR("zmalloc cmd_ctx->lsm");
4536 cmd_ctx
->llm
= NULL
;
4537 cmd_ctx
->session
= NULL
;
4539 health_code_update();
4542 * Data is received from the lttng client. The struct
4543 * lttcomm_session_msg (lsm) contains the command and data request of
4546 DBG("Receiving data from client ...");
4547 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
4548 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
4550 DBG("Nothing recv() from client... continuing");
4556 clean_command_ctx(&cmd_ctx
);
4560 health_code_update();
4562 // TODO: Validate cmd_ctx including sanity check for
4563 // security purpose.
4565 rcu_thread_online();
4567 * This function dispatch the work to the kernel or userspace tracer
4568 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4569 * informations for the client. The command context struct contains
4570 * everything this function may needs.
4572 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
4573 rcu_thread_offline();
4581 * TODO: Inform client somehow of the fatal error. At
4582 * this point, ret < 0 means that a zmalloc failed
4583 * (ENOMEM). Error detected but still accept
4584 * command, unless a socket error has been
4587 clean_command_ctx(&cmd_ctx
);
4591 health_code_update();
4593 DBG("Sending response (size: %d, retcode: %s (%d))",
4594 cmd_ctx
->lttng_msg_size
,
4595 lttng_strerror(-cmd_ctx
->llm
->ret_code
),
4596 cmd_ctx
->llm
->ret_code
);
4597 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
4599 ERR("Failed to send data back to client");
4602 /* End of transmission */
4609 clean_command_ctx(&cmd_ctx
);
4611 health_code_update();
4623 lttng_poll_clean(&events
);
4624 clean_command_ctx(&cmd_ctx
);
4628 unlink(config
.client_unix_sock_path
.value
);
4629 if (client_sock
>= 0) {
4630 ret
= close(client_sock
);
4638 ERR("Health error occurred in %s", __func__
);
4641 health_unregister(health_sessiond
);
4643 DBG("Client thread dying");
4645 rcu_unregister_thread();
4648 * Since we are creating the consumer threads, we own them, so we need
4649 * to join them before our thread exits.
4651 ret
= join_consumer_thread(&kconsumer_data
);
4654 PERROR("join_consumer");
4657 ret
= join_consumer_thread(&ustconsumer32_data
);
4660 PERROR("join_consumer ust32");
4663 ret
= join_consumer_thread(&ustconsumer64_data
);
4666 PERROR("join_consumer ust64");
4671 static int string_match(const char *str1
, const char *str2
)
4673 return (str1
&& str2
) && !strcmp(str1
, str2
);
4677 * Take an option from the getopt output and set it in the right variable to be
4680 * Return 0 on success else a negative value.
4682 static int set_option(int opt
, const char *arg
, const char *optname
)
4686 if (string_match(optname
, "client-sock") || opt
== 'c') {
4687 if (!arg
|| *arg
== '\0') {
4691 if (lttng_is_setuid_setgid()) {
4692 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4693 "-c, --client-sock");
4695 config_string_set(&config
.client_unix_sock_path
,
4697 if (!config
.client_unix_sock_path
.value
) {
4702 } else if (string_match(optname
, "apps-sock") || opt
== 'a') {
4703 if (!arg
|| *arg
== '\0') {
4707 if (lttng_is_setuid_setgid()) {
4708 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4711 config_string_set(&config
.apps_unix_sock_path
,
4713 if (!config
.apps_unix_sock_path
.value
) {
4718 } else if (string_match(optname
, "daemonize") || opt
== 'd') {
4719 config
.daemonize
= true;
4720 } else if (string_match(optname
, "background") || opt
== 'b') {
4721 config
.background
= true;
4722 } else if (string_match(optname
, "group") || opt
== 'g') {
4723 if (!arg
|| *arg
== '\0') {
4727 if (lttng_is_setuid_setgid()) {
4728 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4731 config_string_set(&config
.tracing_group_name
,
4733 if (!config
.tracing_group_name
.value
) {
4738 } else if (string_match(optname
, "help") || opt
== 'h') {
4739 ret
= utils_show_help(8, "lttng-sessiond", help_msg
);
4741 ERR("Cannot show --help for `lttng-sessiond`");
4744 exit(ret
? EXIT_FAILURE
: EXIT_SUCCESS
);
4745 } else if (string_match(optname
, "version") || opt
== 'V') {
4746 fprintf(stdout
, "%s\n", VERSION
);
4748 } else if (string_match(optname
, "sig-parent") || opt
== 'S') {
4749 config
.sig_parent
= true;
4750 } else if (string_match(optname
, "kconsumerd-err-sock")) {
4751 if (!arg
|| *arg
== '\0') {
4755 if (lttng_is_setuid_setgid()) {
4756 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4757 "--kconsumerd-err-sock");
4759 config_string_set(&config
.kconsumerd_err_unix_sock_path
,
4761 if (!config
.kconsumerd_err_unix_sock_path
.value
) {
4766 } else if (string_match(optname
, "kconsumerd-cmd-sock")) {
4767 if (!arg
|| *arg
== '\0') {
4771 if (lttng_is_setuid_setgid()) {
4772 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4773 "--kconsumerd-cmd-sock");
4775 config_string_set(&config
.kconsumerd_cmd_unix_sock_path
,
4777 if (!config
.kconsumerd_cmd_unix_sock_path
.value
) {
4782 } else if (string_match(optname
, "ustconsumerd64-err-sock")) {
4783 if (!arg
|| *arg
== '\0') {
4787 if (lttng_is_setuid_setgid()) {
4788 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4789 "--ustconsumerd64-err-sock");
4791 config_string_set(&config
.consumerd64_err_unix_sock_path
,
4793 if (!config
.consumerd64_err_unix_sock_path
.value
) {
4798 } else if (string_match(optname
, "ustconsumerd64-cmd-sock")) {
4799 if (!arg
|| *arg
== '\0') {
4803 if (lttng_is_setuid_setgid()) {
4804 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4805 "--ustconsumerd64-cmd-sock");
4807 config_string_set(&config
.consumerd64_cmd_unix_sock_path
,
4809 if (!config
.consumerd64_cmd_unix_sock_path
.value
) {
4814 } else if (string_match(optname
, "ustconsumerd32-err-sock")) {
4815 if (!arg
|| *arg
== '\0') {
4819 if (lttng_is_setuid_setgid()) {
4820 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4821 "--ustconsumerd32-err-sock");
4823 config_string_set(&config
.consumerd32_err_unix_sock_path
,
4825 if (!config
.consumerd32_err_unix_sock_path
.value
) {
4830 } else if (string_match(optname
, "ustconsumerd32-cmd-sock")) {
4831 if (!arg
|| *arg
== '\0') {
4835 if (lttng_is_setuid_setgid()) {
4836 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4837 "--ustconsumerd32-cmd-sock");
4839 config_string_set(&config
.consumerd32_cmd_unix_sock_path
,
4841 if (!config
.consumerd32_cmd_unix_sock_path
.value
) {
4846 } else if (string_match(optname
, "no-kernel")) {
4847 config
.no_kernel
= true;
4848 } else if (string_match(optname
, "quiet") || opt
== 'q') {
4849 lttng_opt_quiet
= true;
4850 } else if (string_match(optname
, "verbose") || opt
== 'v') {
4851 /* Verbose level can increase using multiple -v */
4853 /* Value obtained from config file */
4854 config
.verbose
= config_parse_value(arg
);
4856 /* -v used on command line */
4859 /* Clamp value to [0, 3] */
4860 config
.verbose
= config
.verbose
< 0 ? 0 :
4861 (config
.verbose
<= 3 ? config
.verbose
: 3);
4862 } else if (string_match(optname
, "verbose-consumer")) {
4864 config
.verbose_consumer
= config_parse_value(arg
);
4866 config
.verbose_consumer
++;
4868 } else if (string_match(optname
, "consumerd32-path")) {
4869 if (!arg
|| *arg
== '\0') {
4873 if (lttng_is_setuid_setgid()) {
4874 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4875 "--consumerd32-path");
4877 config_string_set(&config
.consumerd32_bin_path
,
4879 if (!config
.consumerd32_bin_path
.value
) {
4884 } else if (string_match(optname
, "consumerd32-libdir")) {
4885 if (!arg
|| *arg
== '\0') {
4889 if (lttng_is_setuid_setgid()) {
4890 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4891 "--consumerd32-libdir");
4893 config_string_set(&config
.consumerd32_lib_dir
,
4895 if (!config
.consumerd32_lib_dir
.value
) {
4900 } else if (string_match(optname
, "consumerd64-path")) {
4901 if (!arg
|| *arg
== '\0') {
4905 if (lttng_is_setuid_setgid()) {
4906 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4907 "--consumerd64-path");
4909 config_string_set(&config
.consumerd64_bin_path
,
4911 if (!config
.consumerd64_bin_path
.value
) {
4916 } else if (string_match(optname
, "consumerd64-libdir")) {
4917 if (!arg
|| *arg
== '\0') {
4921 if (lttng_is_setuid_setgid()) {
4922 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4923 "--consumerd64-libdir");
4925 config_string_set(&config
.consumerd64_lib_dir
,
4927 if (!config
.consumerd64_lib_dir
.value
) {
4932 } else if (string_match(optname
, "pidfile") || opt
== 'p') {
4933 if (!arg
|| *arg
== '\0') {
4937 if (lttng_is_setuid_setgid()) {
4938 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4941 config_string_set(&config
.pid_file_path
, strdup(arg
));
4942 if (!config
.pid_file_path
.value
) {
4947 } else if (string_match(optname
, "agent-tcp-port")) {
4948 if (!arg
|| *arg
== '\0') {
4952 if (lttng_is_setuid_setgid()) {
4953 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4954 "--agent-tcp-port");
4959 v
= strtoul(arg
, NULL
, 0);
4960 if (errno
!= 0 || !isdigit(arg
[0])) {
4961 ERR("Wrong value in --agent-tcp-port parameter: %s", arg
);
4964 if (v
== 0 || v
>= 65535) {
4965 ERR("Port overflow in --agent-tcp-port parameter: %s", arg
);
4968 config
.agent_tcp_port
= (uint32_t) v
;
4969 DBG3("Agent TCP port set to non default: %u", config
.agent_tcp_port
);
4971 } else if (string_match(optname
, "load") || opt
== 'l') {
4972 if (!arg
|| *arg
== '\0') {
4976 if (lttng_is_setuid_setgid()) {
4977 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4980 config_string_set(&config
.load_session_path
, strdup(arg
));
4981 if (!config
.load_session_path
.value
) {
4986 } else if (string_match(optname
, "kmod-probes")) {
4987 if (!arg
|| *arg
== '\0') {
4991 if (lttng_is_setuid_setgid()) {
4992 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4995 config_string_set(&config
.kmod_probes_list
, strdup(arg
));
4996 if (!config
.kmod_probes_list
.value
) {
5001 } else if (string_match(optname
, "extra-kmod-probes")) {
5002 if (!arg
|| *arg
== '\0') {
5006 if (lttng_is_setuid_setgid()) {
5007 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5008 "--extra-kmod-probes");
5010 config_string_set(&config
.kmod_extra_probes_list
,
5012 if (!config
.kmod_extra_probes_list
.value
) {
5017 } else if (string_match(optname
, "config") || opt
== 'f') {
5018 /* This is handled in set_options() thus silent skip. */
5021 /* Unknown option or other error.
5022 * Error is printed by getopt, just return */
5027 if (ret
== -EINVAL
) {
5028 const char *opt_name
= "unknown";
5031 for (i
= 0; i
< sizeof(long_options
) / sizeof(struct option
);
5033 if (opt
== long_options
[i
].val
) {
5034 opt_name
= long_options
[i
].name
;
5039 WARN("Invalid argument provided for option \"%s\", using default value.",
5047 * config_entry_handler_cb used to handle options read from a config file.
5048 * See config_entry_handler_cb comment in common/config/session-config.h for the
5049 * return value conventions.
5051 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
5055 if (!entry
|| !entry
->name
|| !entry
->value
) {
5060 /* Check if the option is to be ignored */
5061 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
5062 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
5067 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1;
5070 /* Ignore if not fully matched. */
5071 if (strcmp(entry
->name
, long_options
[i
].name
)) {
5076 * If the option takes no argument on the command line, we have to
5077 * check if the value is "true". We support non-zero numeric values,
5080 if (!long_options
[i
].has_arg
) {
5081 ret
= config_parse_value(entry
->value
);
5084 WARN("Invalid configuration value \"%s\" for option %s",
5085 entry
->value
, entry
->name
);
5087 /* False, skip boolean config option. */
5092 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
5096 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry
->name
);
5103 * daemon configuration loading and argument parsing
5105 static int set_options(int argc
, char **argv
)
5107 int ret
= 0, c
= 0, option_index
= 0;
5108 int orig_optopt
= optopt
, orig_optind
= optind
;
5110 const char *config_path
= NULL
;
5112 optstring
= utils_generate_optstring(long_options
,
5113 sizeof(long_options
) / sizeof(struct option
));
5119 /* Check for the --config option */
5120 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
5121 &option_index
)) != -1) {
5125 } else if (c
!= 'f') {
5126 /* if not equal to --config option. */
5130 if (lttng_is_setuid_setgid()) {
5131 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5134 config_path
= utils_expand_path(optarg
);
5136 ERR("Failed to resolve path: %s", optarg
);
5141 ret
= config_get_section_entries(config_path
, config_section_name
,
5142 config_entry_handler
, NULL
);
5145 ERR("Invalid configuration option at line %i", ret
);
5151 /* Reset getopt's global state */
5152 optopt
= orig_optopt
;
5153 optind
= orig_optind
;
5157 * getopt_long() will not set option_index if it encounters a
5160 c
= getopt_long(argc
, argv
, optstring
, long_options
,
5167 * Pass NULL as the long option name if popt left the index
5170 ret
= set_option(c
, optarg
,
5171 option_index
< 0 ? NULL
:
5172 long_options
[option_index
].name
);
5184 * Creates the two needed socket by the daemon.
5185 * apps_sock - The communication socket for all UST apps.
5186 * client_sock - The communication of the cli tool (lttng).
5188 static int init_daemon_socket(void)
5193 old_umask
= umask(0);
5195 /* Create client tool unix socket */
5196 client_sock
= lttcomm_create_unix_sock(config
.client_unix_sock_path
.value
);
5197 if (client_sock
< 0) {
5198 ERR("Create unix sock failed: %s", config
.client_unix_sock_path
.value
);
5203 /* Set the cloexec flag */
5204 ret
= utils_set_fd_cloexec(client_sock
);
5206 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
5207 "Continuing but note that the consumer daemon will have a "
5208 "reference to this socket on exec()", client_sock
);
5211 /* File permission MUST be 660 */
5212 ret
= chmod(config
.client_unix_sock_path
.value
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
5214 ERR("Set file permissions failed: %s", config
.client_unix_sock_path
.value
);
5219 /* Create the application unix socket */
5220 apps_sock
= lttcomm_create_unix_sock(config
.apps_unix_sock_path
.value
);
5221 if (apps_sock
< 0) {
5222 ERR("Create unix sock failed: %s", config
.apps_unix_sock_path
.value
);
5227 /* Set the cloexec flag */
5228 ret
= utils_set_fd_cloexec(apps_sock
);
5230 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
5231 "Continuing but note that the consumer daemon will have a "
5232 "reference to this socket on exec()", apps_sock
);
5235 /* File permission MUST be 666 */
5236 ret
= chmod(config
.apps_unix_sock_path
.value
,
5237 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
5239 ERR("Set file permissions failed: %s", config
.apps_unix_sock_path
.value
);
5244 DBG3("Session daemon client socket %d and application socket %d created",
5245 client_sock
, apps_sock
);
5253 * Check if the global socket is available, and if a daemon is answering at the
5254 * other side. If yes, error is returned.
5256 static int check_existing_daemon(void)
5258 /* Is there anybody out there ? */
5259 if (lttng_session_daemon_alive()) {
5267 * Set the tracing group gid onto the client socket.
5269 * Race window between mkdir and chown is OK because we are going from more
5270 * permissive (root.root) to less permissive (root.tracing).
5272 static int set_permissions(char *rundir
)
5277 gid
= utils_get_group_id(config
.tracing_group_name
.value
);
5279 /* Set lttng run dir */
5280 ret
= chown(rundir
, 0, gid
);
5282 ERR("Unable to set group on %s", rundir
);
5287 * Ensure all applications and tracing group can search the run
5288 * dir. Allow everyone to read the directory, since it does not
5289 * buy us anything to hide its content.
5291 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
5293 ERR("Unable to set permissions on %s", rundir
);
5297 /* lttng client socket path */
5298 ret
= chown(config
.client_unix_sock_path
.value
, 0, gid
);
5300 ERR("Unable to set group on %s", config
.client_unix_sock_path
.value
);
5304 /* kconsumer error socket path */
5305 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
5307 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
5311 /* 64-bit ustconsumer error socket path */
5312 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
5314 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
5318 /* 32-bit ustconsumer compat32 error socket path */
5319 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
5321 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
5325 DBG("All permissions are set");
5331 * Create the lttng run directory needed for all global sockets and pipe.
5333 static int create_lttng_rundir(void)
5337 DBG3("Creating LTTng run directory: %s", config
.rundir
.value
);
5339 ret
= mkdir(config
.rundir
.value
, S_IRWXU
);
5341 if (errno
!= EEXIST
) {
5342 ERR("Unable to create %s", config
.rundir
.value
);
5354 * Setup sockets and directory needed by the consumerds' communication with the
5357 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
5362 switch (consumer_data
->type
) {
5363 case LTTNG_CONSUMER_KERNEL
:
5364 path
= config
.kconsumerd_path
.value
;
5366 case LTTNG_CONSUMER64_UST
:
5367 path
= config
.consumerd64_path
.value
;
5369 case LTTNG_CONSUMER32_UST
:
5370 path
= config
.consumerd32_path
.value
;
5373 ERR("Consumer type unknown");
5379 DBG2("Creating consumer directory: %s", path
);
5381 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
5382 if (ret
< 0 && errno
!= EEXIST
) {
5384 ERR("Failed to create %s", path
);
5388 ret
= chown(path
, 0, utils_get_group_id(config
.tracing_group_name
.value
));
5390 ERR("Unable to set group on %s", path
);
5396 /* Create the consumerd error unix socket */
5397 consumer_data
->err_sock
=
5398 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
5399 if (consumer_data
->err_sock
< 0) {
5400 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
5406 * Set the CLOEXEC flag. Return code is useless because either way, the
5409 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
5411 PERROR("utils_set_fd_cloexec");
5412 /* continue anyway */
5415 /* File permission MUST be 660 */
5416 ret
= chmod(consumer_data
->err_unix_sock_path
,
5417 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
5419 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
5429 * Signal handler for the daemon
5431 * Simply stop all worker threads, leaving main() return gracefully after
5432 * joining all threads and calling cleanup().
5434 static void sighandler(int sig
)
5438 DBG("SIGINT caught");
5442 DBG("SIGTERM caught");
5446 CMM_STORE_SHARED(recv_child_signal
, 1);
5454 * Setup signal handler for :
5455 * SIGINT, SIGTERM, SIGPIPE
5457 static int set_signal_handler(void)
5460 struct sigaction sa
;
5463 if ((ret
= sigemptyset(&sigset
)) < 0) {
5464 PERROR("sigemptyset");
5468 sa
.sa_mask
= sigset
;
5471 sa
.sa_handler
= sighandler
;
5472 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
5473 PERROR("sigaction");
5477 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
5478 PERROR("sigaction");
5482 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
5483 PERROR("sigaction");
5487 sa
.sa_handler
= SIG_IGN
;
5488 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
5489 PERROR("sigaction");
5493 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5499 * Set open files limit to unlimited. This daemon can open a large number of
5500 * file descriptors in order to consume multiple kernel traces.
5502 static void set_ulimit(void)
5507 /* The kernel does not allow an infinite limit for open files */
5508 lim
.rlim_cur
= 65535;
5509 lim
.rlim_max
= 65535;
5511 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
5513 PERROR("failed to set open files limit");
5517 static int write_pidfile(void)
5519 return utils_create_pid_file(getpid(), config
.pid_file_path
.value
);
5523 * Create lockfile using the rundir and return its fd.
5525 static int create_lockfile(void)
5527 return utils_create_lock_file(config
.lock_file_path
.value
);
5531 * Write agent TCP port using the rundir.
5533 static int write_agent_port(void)
5535 return utils_create_pid_file(config
.agent_tcp_port
,
5536 config
.agent_port_file_path
.value
);
5539 static int set_clock_plugin_env(void)
5542 char *env_value
= NULL
;
5544 if (!config
.lttng_ust_clock_plugin
.value
) {
5548 ret
= asprintf(&env_value
, "LTTNG_UST_CLOCK_PLUGIN=%s",
5549 config
.lttng_ust_clock_plugin
.value
);
5555 ret
= putenv(env_value
);
5558 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
5562 DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
5563 config
.lttng_ust_clock_plugin
.value
);
5569 struct rotation_thread_timer_queue
*create_rotate_timer_queue(void)
5571 struct rotation_thread_timer_queue
*queue
= NULL
;
5573 queue
= zmalloc(sizeof(struct rotation_thread_timer_queue
));
5575 PERROR("Failed to allocate timer rotate queue");
5579 queue
->event_pipe
= lttng_pipe_open(FD_CLOEXEC
| O_NONBLOCK
);
5580 CDS_INIT_LIST_HEAD(&queue
->list
);
5581 pthread_mutex_init(&queue
->lock
, NULL
);
5588 void destroy_rotate_timer_queue(struct rotation_thread_timer_queue
*queue
)
5590 struct sessiond_rotation_timer
*node
, *tmp_node
;
5596 lttng_pipe_destroy(queue
->event_pipe
);
5598 pthread_mutex_lock(&queue
->lock
);
5599 /* Empty wait queue. */
5600 cds_list_for_each_entry_safe(node
, tmp_node
, &queue
->list
, head
) {
5601 cds_list_del(&node
->head
);
5604 pthread_mutex_unlock(&queue
->lock
);
5606 pthread_mutex_destroy(&queue
->lock
);
5613 int main(int argc
, char **argv
)
5615 int ret
= 0, retval
= 0;
5617 const char *env_app_timeout
;
5618 struct lttng_pipe
*ust32_channel_monitor_pipe
= NULL
,
5619 *ust64_channel_monitor_pipe
= NULL
,
5620 *kernel_channel_monitor_pipe
= NULL
;
5621 bool notification_thread_running
= false;
5622 bool rotation_thread_running
= false;
5623 bool timer_thread_running
= false;
5624 struct lttng_pipe
*ust32_channel_rotate_pipe
= NULL
,
5625 *ust64_channel_rotate_pipe
= NULL
,
5626 *kernel_channel_rotate_pipe
= NULL
;
5627 struct timer_thread_parameters timer_thread_ctx
;
5628 /* Queue of rotation jobs populated by the sessiond-timer. */
5629 struct rotation_thread_timer_queue
*rotation_timer_queue
= NULL
;
5631 init_kernel_workarounds();
5633 rcu_register_thread();
5635 if (set_signal_handler()) {
5637 goto exit_set_signal_handler
;
5640 if (sessiond_timer_signal_init()) {
5642 goto exit_set_signal_handler
;
5645 page_size
= sysconf(_SC_PAGESIZE
);
5646 if (page_size
< 0) {
5647 PERROR("sysconf _SC_PAGESIZE");
5648 page_size
= LONG_MAX
;
5649 WARN("Fallback page size to %ld", page_size
);
5652 ret
= sessiond_config_init(&config
);
5655 goto exit_set_signal_handler
;
5659 * Parse arguments and load the daemon configuration file.
5661 * We have an exit_options exit path to free memory reserved by
5662 * set_options. This is needed because the rest of sessiond_cleanup()
5663 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
5664 * depends on set_options.
5667 if (set_options(argc
, argv
)) {
5672 /* Init config from environment variables. */
5673 sessiond_config_apply_env_config(&config
);
5676 * Resolve all paths received as arguments, configuration option, or
5677 * through environment variable as absolute paths. This is necessary
5678 * since daemonizing causes the sessiond's current working directory
5681 ret
= sessiond_config_resolve_paths(&config
);
5687 lttng_opt_verbose
= config
.verbose
;
5688 lttng_opt_quiet
= config
.quiet
;
5689 kconsumer_data
.err_unix_sock_path
=
5690 config
.kconsumerd_err_unix_sock_path
.value
;
5691 kconsumer_data
.cmd_unix_sock_path
=
5692 config
.kconsumerd_cmd_unix_sock_path
.value
;
5693 ustconsumer32_data
.err_unix_sock_path
=
5694 config
.consumerd32_err_unix_sock_path
.value
;
5695 ustconsumer32_data
.cmd_unix_sock_path
=
5696 config
.consumerd32_cmd_unix_sock_path
.value
;
5697 ustconsumer64_data
.err_unix_sock_path
=
5698 config
.consumerd64_err_unix_sock_path
.value
;
5699 ustconsumer64_data
.cmd_unix_sock_path
=
5700 config
.consumerd64_cmd_unix_sock_path
.value
;
5701 set_clock_plugin_env();
5703 sessiond_config_log(&config
);
5706 if (config
.daemonize
|| config
.background
) {
5709 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
5710 !config
.background
);
5717 * We are in the child. Make sure all other file descriptors are
5718 * closed, in case we are called with more opened file
5719 * descriptors than the standard ones.
5721 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
5726 if (run_as_create_worker(argv
[0]) < 0) {
5727 goto exit_create_run_as_worker_cleanup
;
5731 * Starting from here, we can create threads. This needs to be after
5732 * lttng_daemonize due to RCU.
5736 * Initialize the health check subsystem. This call should set the
5737 * appropriate time values.
5739 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
5740 if (!health_sessiond
) {
5741 PERROR("health_app_create error");
5743 goto exit_health_sessiond_cleanup
;
5746 /* Create thread to clean up RCU hash tables */
5747 if (init_ht_cleanup_thread(&ht_cleanup_thread
)) {
5749 goto exit_ht_cleanup
;
5752 /* Create thread quit pipe */
5753 if (init_thread_quit_pipe()) {
5755 goto exit_init_data
;
5758 /* Check if daemon is UID = 0 */
5759 is_root
= !getuid();
5761 if (create_lttng_rundir()) {
5763 goto exit_init_data
;
5767 /* Create global run dir with root access */
5769 kernel_channel_monitor_pipe
= lttng_pipe_open(0);
5770 if (!kernel_channel_monitor_pipe
) {
5771 ERR("Failed to create kernel consumer channel monitor pipe");
5773 goto exit_init_data
;
5775 kconsumer_data
.channel_monitor_pipe
=
5776 lttng_pipe_release_writefd(
5777 kernel_channel_monitor_pipe
);
5778 if (kconsumer_data
.channel_monitor_pipe
< 0) {
5780 goto exit_init_data
;
5782 kernel_channel_rotate_pipe
= lttng_pipe_open(0);
5783 if (!kernel_channel_rotate_pipe
) {
5784 ERR("Failed to create kernel consumer channel rotate pipe");
5786 goto exit_init_data
;
5788 kconsumer_data
.channel_rotate_pipe
=
5789 lttng_pipe_release_writefd(
5790 kernel_channel_rotate_pipe
);
5791 if (kconsumer_data
.channel_rotate_pipe
< 0) {
5793 goto exit_init_data
;
5797 lockfile_fd
= create_lockfile();
5798 if (lockfile_fd
< 0) {
5800 goto exit_init_data
;
5803 /* Set consumer initial state */
5804 kernel_consumerd_state
= CONSUMER_STOPPED
;
5805 ust_consumerd_state
= CONSUMER_STOPPED
;
5807 ust32_channel_monitor_pipe
= lttng_pipe_open(0);
5808 if (!ust32_channel_monitor_pipe
) {
5809 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
5811 goto exit_init_data
;
5813 ustconsumer32_data
.channel_monitor_pipe
= lttng_pipe_release_writefd(
5814 ust32_channel_monitor_pipe
);
5815 if (ustconsumer32_data
.channel_monitor_pipe
< 0) {
5817 goto exit_init_data
;
5819 ust32_channel_rotate_pipe
= lttng_pipe_open(0);
5820 if (!ust32_channel_rotate_pipe
) {
5821 ERR("Failed to create 32-bit user space consumer channel rotate pipe");
5823 goto exit_init_data
;
5825 ustconsumer32_data
.channel_rotate_pipe
= lttng_pipe_release_writefd(
5826 ust32_channel_rotate_pipe
);
5827 if (ustconsumer32_data
.channel_rotate_pipe
< 0) {
5829 goto exit_init_data
;
5833 * The rotation_timer_queue structure is shared between the sessiond timer
5834 * thread and the rotation thread. The main() keeps the ownership and
5835 * destroys it when both threads have quit.
5837 rotation_timer_queue
= create_rotate_timer_queue();
5838 if (!rotation_timer_queue
) {
5840 goto exit_init_data
;
5842 timer_thread_ctx
.rotation_timer_queue
= rotation_timer_queue
;
5844 ust64_channel_monitor_pipe
= lttng_pipe_open(0);
5845 if (!ust64_channel_monitor_pipe
) {
5846 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
5848 goto exit_init_data
;
5850 ustconsumer64_data
.channel_monitor_pipe
= lttng_pipe_release_writefd(
5851 ust64_channel_monitor_pipe
);
5852 if (ustconsumer64_data
.channel_monitor_pipe
< 0) {
5854 goto exit_init_data
;
5856 ust64_channel_rotate_pipe
= lttng_pipe_open(0);
5857 if (!ust64_channel_rotate_pipe
) {
5858 ERR("Failed to create 64-bit user space consumer channel rotate pipe");
5860 goto exit_init_data
;
5862 ustconsumer64_data
.channel_rotate_pipe
= lttng_pipe_release_writefd(
5863 ust64_channel_rotate_pipe
);
5864 if (ustconsumer64_data
.channel_rotate_pipe
< 0) {
5866 goto exit_init_data
;
5870 * See if daemon already exist.
5872 if (check_existing_daemon()) {
5873 ERR("Already running daemon.\n");
5875 * We do not goto exit because we must not cleanup()
5876 * because a daemon is already running.
5879 goto exit_init_data
;
5883 * Init UST app hash table. Alloc hash table before this point since
5884 * cleanup() can get called after that point.
5886 if (ust_app_ht_alloc()) {
5887 ERR("Failed to allocate UST app hash table");
5889 goto exit_init_data
;
5893 * Initialize agent app hash table. We allocate the hash table here
5894 * since cleanup() can get called after this point.
5896 if (agent_app_ht_alloc()) {
5897 ERR("Failed to allocate Agent app hash table");
5899 goto exit_init_data
;
5903 * These actions must be executed as root. We do that *after* setting up
5904 * the sockets path because we MUST make the check for another daemon using
5905 * those paths *before* trying to set the kernel consumer sockets and init
5909 if (set_consumer_sockets(&kconsumer_data
)) {
5911 goto exit_init_data
;
5914 /* Setup kernel tracer */
5915 if (!config
.no_kernel
) {
5916 init_kernel_tracer();
5917 if (kernel_tracer_fd
>= 0) {
5918 ret
= syscall_init_table();
5920 ERR("Unable to populate syscall table. "
5921 "Syscall tracing won't work "
5922 "for this session daemon.");
5927 /* Set ulimit for open files */
5930 /* init lttng_fd tracking must be done after set_ulimit. */
5933 if (set_consumer_sockets(&ustconsumer64_data
)) {
5935 goto exit_init_data
;
5938 if (set_consumer_sockets(&ustconsumer32_data
)) {
5940 goto exit_init_data
;
5943 /* Setup the needed unix socket */
5944 if (init_daemon_socket()) {
5946 goto exit_init_data
;
5949 /* Set credentials to socket */
5950 if (is_root
&& set_permissions(config
.rundir
.value
)) {
5952 goto exit_init_data
;
5955 /* Get parent pid if -S, --sig-parent is specified. */
5956 if (config
.sig_parent
) {
5960 /* Setup the kernel pipe for waking up the kernel thread */
5961 if (is_root
&& !config
.no_kernel
) {
5962 if (utils_create_pipe_cloexec(kernel_poll_pipe
)) {
5964 goto exit_init_data
;
5968 /* Setup the thread apps communication pipe. */
5969 if (utils_create_pipe_cloexec(apps_cmd_pipe
)) {
5971 goto exit_init_data
;
5974 /* Setup the thread apps notify communication pipe. */
5975 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
)) {
5977 goto exit_init_data
;
5980 /* Initialize global buffer per UID and PID registry. */
5981 buffer_reg_init_uid_registry();
5982 buffer_reg_init_pid_registry();
5984 /* Init UST command queue. */
5985 cds_wfcq_init(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
5988 * Get session list pointer. This pointer MUST NOT be free'd. This list
5989 * is statically declared in session.c
5991 session_list_ptr
= session_get_list();
5995 /* Check for the application socket timeout env variable. */
5996 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
5997 if (env_app_timeout
) {
5998 config
.app_socket_timeout
= atoi(env_app_timeout
);
6000 config
.app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
6003 ret
= write_pidfile();
6005 ERR("Error in write_pidfile");
6007 goto exit_init_data
;
6009 ret
= write_agent_port();
6011 ERR("Error in write_agent_port");
6013 goto exit_init_data
;
6016 /* Initialize communication library */
6018 /* Initialize TCP timeout values */
6019 lttcomm_inet_init();
6021 if (load_session_init_data(&load_info
) < 0) {
6023 goto exit_init_data
;
6025 load_info
->path
= config
.load_session_path
.value
;
6027 /* Create health-check thread. */
6028 ret
= pthread_create(&health_thread
, default_pthread_attr(),
6029 thread_manage_health
, (void *) NULL
);
6032 PERROR("pthread_create health");
6037 /* notification_thread_data acquires the pipes' read side. */
6038 notification_thread_handle
= notification_thread_handle_create(
6039 ust32_channel_monitor_pipe
,
6040 ust64_channel_monitor_pipe
,
6041 kernel_channel_monitor_pipe
);
6042 if (!notification_thread_handle
) {
6044 ERR("Failed to create notification thread shared data");
6046 goto exit_notification
;
6049 /* Create notification thread. */
6050 ret
= pthread_create(¬ification_thread
, default_pthread_attr(),
6051 thread_notification
, notification_thread_handle
);
6054 PERROR("pthread_create notification");
6057 goto exit_notification
;
6059 notification_thread_running
= true;
6061 /* Create timer thread. */
6062 ret
= pthread_create(&timer_thread
, default_pthread_attr(),
6063 sessiond_timer_thread
, &timer_thread_ctx
);
6066 PERROR("pthread_create timer");
6069 goto exit_notification
;
6071 timer_thread_running
= true;
6073 /* rotation_thread_data acquires the pipes' read side. */
6074 rotation_thread_handle
= rotation_thread_handle_create(
6075 ust32_channel_rotate_pipe
,
6076 ust64_channel_rotate_pipe
,
6077 kernel_channel_rotate_pipe
,
6078 thread_quit_pipe
[0],
6079 rotation_timer_queue
);
6080 if (!rotation_thread_handle
) {
6082 ERR("Failed to create rotation thread shared data");
6087 /* Create rotation thread. */
6088 ret
= pthread_create(&rotation_thread
, default_pthread_attr(),
6089 thread_rotation
, rotation_thread_handle
);
6092 PERROR("pthread_create rotation");
6097 rotation_thread_running
= true;
6099 /* Create thread to manage the client socket */
6100 ret
= pthread_create(&client_thread
, default_pthread_attr(),
6101 thread_manage_clients
, (void *) NULL
);
6104 PERROR("pthread_create clients");
6110 /* Create thread to dispatch registration */
6111 ret
= pthread_create(&dispatch_thread
, default_pthread_attr(),
6112 thread_dispatch_ust_registration
, (void *) NULL
);
6115 PERROR("pthread_create dispatch");
6121 /* Create thread to manage application registration. */
6122 ret
= pthread_create(®_apps_thread
, default_pthread_attr(),
6123 thread_registration_apps
, (void *) NULL
);
6126 PERROR("pthread_create registration");
6132 /* Create thread to manage application socket */
6133 ret
= pthread_create(&apps_thread
, default_pthread_attr(),
6134 thread_manage_apps
, (void *) NULL
);
6137 PERROR("pthread_create apps");
6143 /* Create thread to manage application notify socket */
6144 ret
= pthread_create(&apps_notify_thread
, default_pthread_attr(),
6145 ust_thread_manage_notify
, (void *) NULL
);
6148 PERROR("pthread_create notify");
6151 goto exit_apps_notify
;
6154 /* Create agent registration thread. */
6155 ret
= pthread_create(&agent_reg_thread
, default_pthread_attr(),
6156 agent_thread_manage_registration
, (void *) NULL
);
6159 PERROR("pthread_create agent");
6162 goto exit_agent_reg
;
6165 /* Don't start this thread if kernel tracing is not requested nor root */
6166 if (is_root
&& !config
.no_kernel
) {
6167 /* Create kernel thread to manage kernel event */
6168 ret
= pthread_create(&kernel_thread
, default_pthread_attr(),
6169 thread_manage_kernel
, (void *) NULL
);
6172 PERROR("pthread_create kernel");
6179 /* Create session loading thread. */
6180 ret
= pthread_create(&load_session_thread
, default_pthread_attr(),
6181 thread_load_session
, load_info
);
6184 PERROR("pthread_create load_session_thread");
6187 goto exit_load_session
;
6191 * This is where we start awaiting program completion (e.g. through
6192 * signal that asks threads to teardown).
6195 ret
= pthread_join(load_session_thread
, &status
);
6198 PERROR("pthread_join load_session_thread");
6203 if (is_root
&& !config
.no_kernel
) {
6204 ret
= pthread_join(kernel_thread
, &status
);
6207 PERROR("pthread_join");
6213 ret
= pthread_join(agent_reg_thread
, &status
);
6216 PERROR("pthread_join agent");
6221 ret
= pthread_join(apps_notify_thread
, &status
);
6224 PERROR("pthread_join apps notify");
6229 ret
= pthread_join(apps_thread
, &status
);
6232 PERROR("pthread_join apps");
6237 ret
= pthread_join(reg_apps_thread
, &status
);
6240 PERROR("pthread_join");
6246 * Join dispatch thread after joining reg_apps_thread to ensure
6247 * we don't leak applications in the queue.
6249 ret
= pthread_join(dispatch_thread
, &status
);
6252 PERROR("pthread_join");
6257 ret
= pthread_join(client_thread
, &status
);
6260 PERROR("pthread_join");
6267 ret
= pthread_join(health_thread
, &status
);
6270 PERROR("pthread_join health thread");
6277 * Wait for all pending call_rcu work to complete before tearing
6278 * down data structures. call_rcu worker may be trying to
6279 * perform lookups in those structures.
6283 * sessiond_cleanup() is called when no other thread is running, except
6284 * the ht_cleanup thread, which is needed to destroy the hash tables.
6286 rcu_thread_online();
6290 * Ensure all prior call_rcu are done. call_rcu callbacks may push
6291 * hash tables to the ht_cleanup thread. Therefore, we ensure that
6292 * the queue is empty before shutting down the clean-up thread.
6297 * The teardown of the notification system is performed after the
6298 * session daemon's teardown in order to allow it to be notified
6299 * of the active session and channels at the moment of the teardown.
6301 if (notification_thread_handle
) {
6302 if (notification_thread_running
) {
6303 notification_thread_command_quit(
6304 notification_thread_handle
);
6305 ret
= pthread_join(notification_thread
, &status
);
6308 PERROR("pthread_join notification thread");
6312 notification_thread_handle_destroy(notification_thread_handle
);
6315 if (rotation_thread_handle
) {
6316 if (rotation_thread_running
) {
6317 ret
= pthread_join(rotation_thread
, &status
);
6320 PERROR("pthread_join rotation thread");
6324 rotation_thread_handle_destroy(rotation_thread_handle
);
6327 if (timer_thread_running
) {
6328 kill(getpid(), LTTNG_SESSIOND_SIG_EXIT
);
6329 ret
= pthread_join(timer_thread
, &status
);
6332 PERROR("pthread_join timer thread");
6338 * After the rotation and timer thread have quit, we can safely destroy
6339 * the rotation_timer_queue.
6341 destroy_rotate_timer_queue(rotation_timer_queue
);
6343 rcu_thread_offline();
6344 rcu_unregister_thread();
6346 ret
= fini_ht_cleanup_thread(&ht_cleanup_thread
);
6350 lttng_pipe_destroy(ust32_channel_monitor_pipe
);
6351 lttng_pipe_destroy(ust64_channel_monitor_pipe
);
6352 lttng_pipe_destroy(kernel_channel_monitor_pipe
);
6353 lttng_pipe_destroy(ust32_channel_rotate_pipe
);
6354 lttng_pipe_destroy(ust64_channel_rotate_pipe
);
6355 lttng_pipe_destroy(kernel_channel_rotate_pipe
);
6358 health_app_destroy(health_sessiond
);
6359 exit_health_sessiond_cleanup
:
6360 exit_create_run_as_worker_cleanup
:
6363 sessiond_cleanup_options();
6365 exit_set_signal_handler
: