2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
36 #include <urcu/uatomic.h>
40 #include <common/common.h>
41 #include <common/compat/socket.h>
42 #include <common/defaults.h>
43 #include <common/kernel-consumer/kernel-consumer.h>
44 #include <common/futex.h>
45 #include <common/relayd/relayd.h>
46 #include <common/utils.h>
48 #include "lttng-sessiond.h"
49 #include "buffer-registry.h"
56 #include "kernel-consumer.h"
60 #include "ust-consumer.h"
64 #include "testpoint.h"
65 #include "ust-thread.h"
67 #define CONSUMERD_FILE "lttng-consumerd"
70 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
73 const char *opt_tracing_group
;
74 static const char *opt_pidfile
;
75 static int opt_sig_parent
;
76 static int opt_verbose_consumer
;
77 static int opt_daemon
;
78 static int opt_no_kernel
;
79 static int is_root
; /* Set to 1 if the daemon is running as root */
80 static pid_t ppid
; /* Parent PID for --sig-parent option */
84 * Consumer daemon specific control data. Every value not initialized here is
85 * set to 0 by the static definition.
87 static struct consumer_data kconsumer_data
= {
88 .type
= LTTNG_CONSUMER_KERNEL
,
89 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
90 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
93 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
94 .lock
= PTHREAD_MUTEX_INITIALIZER
,
95 .cond
= PTHREAD_COND_INITIALIZER
,
96 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
98 static struct consumer_data ustconsumer64_data
= {
99 .type
= LTTNG_CONSUMER64_UST
,
100 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
101 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
104 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
105 .lock
= PTHREAD_MUTEX_INITIALIZER
,
106 .cond
= PTHREAD_COND_INITIALIZER
,
107 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
109 static struct consumer_data ustconsumer32_data
= {
110 .type
= LTTNG_CONSUMER32_UST
,
111 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
115 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
116 .lock
= PTHREAD_MUTEX_INITIALIZER
,
117 .cond
= PTHREAD_COND_INITIALIZER
,
118 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
121 /* Shared between threads */
122 static int dispatch_thread_exit
;
124 /* Global application Unix socket path */
125 static char apps_unix_sock_path
[PATH_MAX
];
126 /* Global client Unix socket path */
127 static char client_unix_sock_path
[PATH_MAX
];
128 /* global wait shm path for UST */
129 static char wait_shm_path
[PATH_MAX
];
130 /* Global health check unix path */
131 static char health_unix_sock_path
[PATH_MAX
];
133 /* Sockets and FDs */
134 static int client_sock
= -1;
135 static int apps_sock
= -1;
136 int kernel_tracer_fd
= -1;
137 static int kernel_poll_pipe
[2] = { -1, -1 };
140 * Quit pipe for all threads. This permits a single cancellation point
141 * for all threads when receiving an event on the pipe.
143 static int thread_quit_pipe
[2] = { -1, -1 };
146 * This pipe is used to inform the thread managing application communication
147 * that a command is queued and ready to be processed.
149 static int apps_cmd_pipe
[2] = { -1, -1 };
151 int apps_cmd_notify_pipe
[2] = { -1, -1 };
153 /* Pthread, Mutexes and Semaphores */
154 static pthread_t apps_thread
;
155 static pthread_t apps_notify_thread
;
156 static pthread_t reg_apps_thread
;
157 static pthread_t client_thread
;
158 static pthread_t kernel_thread
;
159 static pthread_t dispatch_thread
;
160 static pthread_t health_thread
;
161 static pthread_t ht_cleanup_thread
;
164 * UST registration command queue. This queue is tied with a futex and uses a N
165 * wakers / 1 waiter implemented and detailed in futex.c/.h
167 * The thread_manage_apps and thread_dispatch_ust_registration interact with
168 * this queue and the wait/wake scheme.
170 static struct ust_cmd_queue ust_cmd_queue
;
173 * Pointer initialized before thread creation.
175 * This points to the tracing session list containing the session count and a
176 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
177 * MUST NOT be taken if you call a public function in session.c.
179 * The lock is nested inside the structure: session_list_ptr->lock. Please use
180 * session_lock_list and session_unlock_list for lock acquisition.
182 static struct ltt_session_list
*session_list_ptr
;
184 int ust_consumerd64_fd
= -1;
185 int ust_consumerd32_fd
= -1;
187 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
188 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
189 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
190 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
192 static const char *module_proc_lttng
= "/proc/lttng";
195 * Consumer daemon state which is changed when spawning it, killing it or in
196 * case of a fatal error.
198 enum consumerd_state
{
199 CONSUMER_STARTED
= 1,
200 CONSUMER_STOPPED
= 2,
205 * This consumer daemon state is used to validate if a client command will be
206 * able to reach the consumer. If not, the client is informed. For instance,
207 * doing a "lttng start" when the consumer state is set to ERROR will return an
208 * error to the client.
210 * The following example shows a possible race condition of this scheme:
212 * consumer thread error happens
214 * client cmd checks state -> still OK
215 * consumer thread exit, sets error
216 * client cmd try to talk to consumer
219 * However, since the consumer is a different daemon, we have no way of making
220 * sure the command will reach it safely even with this state flag. This is why
221 * we consider that up to the state validation during command processing, the
222 * command is safe. After that, we can not guarantee the correctness of the
223 * client request vis-a-vis the consumer.
225 static enum consumerd_state ust_consumerd_state
;
226 static enum consumerd_state kernel_consumerd_state
;
229 * Socket timeout for receiving and sending in seconds.
231 static int app_socket_timeout
;
233 /* Set in main() with the current page size. */
237 void setup_consumerd_path(void)
239 const char *bin
, *libdir
;
242 * Allow INSTALL_BIN_PATH to be used as a target path for the
243 * native architecture size consumer if CONFIG_CONSUMER*_PATH
244 * has not been defined.
246 #if (CAA_BITS_PER_LONG == 32)
247 if (!consumerd32_bin
[0]) {
248 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
250 if (!consumerd32_libdir
[0]) {
251 consumerd32_libdir
= INSTALL_LIB_PATH
;
253 #elif (CAA_BITS_PER_LONG == 64)
254 if (!consumerd64_bin
[0]) {
255 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
257 if (!consumerd64_libdir
[0]) {
258 consumerd64_libdir
= INSTALL_LIB_PATH
;
261 #error "Unknown bitness"
265 * runtime env. var. overrides the build default.
267 bin
= getenv("LTTNG_CONSUMERD32_BIN");
269 consumerd32_bin
= bin
;
271 bin
= getenv("LTTNG_CONSUMERD64_BIN");
273 consumerd64_bin
= bin
;
275 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
277 consumerd32_libdir
= libdir
;
279 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
281 consumerd64_libdir
= libdir
;
286 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
288 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
294 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
300 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
312 * Check if the thread quit pipe was triggered.
314 * Return 1 if it was triggered else 0;
316 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
318 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
326 * Return group ID of the tracing group or -1 if not found.
328 static gid_t
allowed_group(void)
332 if (opt_tracing_group
) {
333 grp
= getgrnam(opt_tracing_group
);
335 grp
= getgrnam(default_tracing_group
);
345 * Init thread quit pipe.
347 * Return -1 on error or 0 if all pipes are created.
349 static int init_thread_quit_pipe(void)
353 ret
= pipe(thread_quit_pipe
);
355 PERROR("thread quit pipe");
359 for (i
= 0; i
< 2; i
++) {
360 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
372 * Stop all threads by closing the thread quit pipe.
374 static void stop_threads(void)
378 /* Stopping all threads */
379 DBG("Terminating all threads");
380 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
382 ERR("write error on thread quit pipe");
385 /* Dispatch thread */
386 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
387 futex_nto1_wake(&ust_cmd_queue
.futex
);
391 * Close every consumer sockets.
393 static void close_consumer_sockets(void)
397 if (kconsumer_data
.err_sock
>= 0) {
398 ret
= close(kconsumer_data
.err_sock
);
400 PERROR("kernel consumer err_sock close");
403 if (ustconsumer32_data
.err_sock
>= 0) {
404 ret
= close(ustconsumer32_data
.err_sock
);
406 PERROR("UST consumerd32 err_sock close");
409 if (ustconsumer64_data
.err_sock
>= 0) {
410 ret
= close(ustconsumer64_data
.err_sock
);
412 PERROR("UST consumerd64 err_sock close");
415 if (kconsumer_data
.cmd_sock
>= 0) {
416 ret
= close(kconsumer_data
.cmd_sock
);
418 PERROR("kernel consumer cmd_sock close");
421 if (ustconsumer32_data
.cmd_sock
>= 0) {
422 ret
= close(ustconsumer32_data
.cmd_sock
);
424 PERROR("UST consumerd32 cmd_sock close");
427 if (ustconsumer64_data
.cmd_sock
>= 0) {
428 ret
= close(ustconsumer64_data
.cmd_sock
);
430 PERROR("UST consumerd64 cmd_sock close");
438 static void cleanup(void)
442 struct ltt_session
*sess
, *stmp
;
447 * Close the thread quit pipe. It has already done its job,
448 * since we are now called.
450 utils_close_pipe(thread_quit_pipe
);
453 * If opt_pidfile is undefined, the default file will be wiped when
454 * removing the rundir.
457 ret
= remove(opt_pidfile
);
459 PERROR("remove pidfile %s", opt_pidfile
);
463 DBG("Removing %s directory", rundir
);
464 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
466 ERR("asprintf failed. Something is really wrong!");
469 /* Remove lttng run directory */
472 ERR("Unable to clean %s", rundir
);
477 DBG("Cleaning up all sessions");
479 /* Destroy session list mutex */
480 if (session_list_ptr
!= NULL
) {
481 pthread_mutex_destroy(&session_list_ptr
->lock
);
483 /* Cleanup ALL session */
484 cds_list_for_each_entry_safe(sess
, stmp
,
485 &session_list_ptr
->head
, list
) {
486 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
490 DBG("Closing all UST sockets");
491 ust_app_clean_list();
492 buffer_reg_destroy_registries();
494 if (is_root
&& !opt_no_kernel
) {
495 DBG2("Closing kernel fd");
496 if (kernel_tracer_fd
>= 0) {
497 ret
= close(kernel_tracer_fd
);
502 DBG("Unloading kernel modules");
503 modprobe_remove_lttng_all();
506 close_consumer_sockets();
509 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
510 "Matthew, BEET driven development works!%c[%dm",
511 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
516 * Send data on a unix socket using the liblttsessiondcomm API.
518 * Return lttcomm error code.
520 static int send_unix_sock(int sock
, void *buf
, size_t len
)
522 /* Check valid length */
527 return lttcomm_send_unix_sock(sock
, buf
, len
);
531 * Free memory of a command context structure.
533 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
535 DBG("Clean command context structure");
537 if ((*cmd_ctx
)->llm
) {
538 free((*cmd_ctx
)->llm
);
540 if ((*cmd_ctx
)->lsm
) {
541 free((*cmd_ctx
)->lsm
);
549 * Notify UST applications using the shm mmap futex.
551 static int notify_ust_apps(int active
)
555 DBG("Notifying applications of session daemon state: %d", active
);
557 /* See shm.c for this call implying mmap, shm and futex calls */
558 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
559 if (wait_shm_mmap
== NULL
) {
563 /* Wake waiting process */
564 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
566 /* Apps notified successfully */
574 * Setup the outgoing data buffer for the response (llm) by allocating the
575 * right amount of memory and copying the original information from the lsm
578 * Return total size of the buffer pointed by buf.
580 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
586 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
587 if (cmd_ctx
->llm
== NULL
) {
593 /* Copy common data */
594 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
595 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
597 cmd_ctx
->llm
->data_size
= size
;
598 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
607 * Update the kernel poll set of all channel fd available over all tracing
608 * session. Add the wakeup pipe at the end of the set.
610 static int update_kernel_poll(struct lttng_poll_event
*events
)
613 struct ltt_session
*session
;
614 struct ltt_kernel_channel
*channel
;
616 DBG("Updating kernel poll set");
619 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
620 session_lock(session
);
621 if (session
->kernel_session
== NULL
) {
622 session_unlock(session
);
626 cds_list_for_each_entry(channel
,
627 &session
->kernel_session
->channel_list
.head
, list
) {
628 /* Add channel fd to the kernel poll set */
629 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
631 session_unlock(session
);
634 DBG("Channel fd %d added to kernel set", channel
->fd
);
636 session_unlock(session
);
638 session_unlock_list();
643 session_unlock_list();
648 * Find the channel fd from 'fd' over all tracing session. When found, check
649 * for new channel stream and send those stream fds to the kernel consumer.
651 * Useful for CPU hotplug feature.
653 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
656 struct ltt_session
*session
;
657 struct ltt_kernel_session
*ksess
;
658 struct ltt_kernel_channel
*channel
;
660 DBG("Updating kernel streams for channel fd %d", fd
);
663 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
664 session_lock(session
);
665 if (session
->kernel_session
== NULL
) {
666 session_unlock(session
);
669 ksess
= session
->kernel_session
;
671 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
672 if (channel
->fd
== fd
) {
673 DBG("Channel found, updating kernel streams");
674 ret
= kernel_open_channel_stream(channel
);
678 /* Update the stream global counter */
679 ksess
->stream_count_global
+= ret
;
682 * Have we already sent fds to the consumer? If yes, it means
683 * that tracing is started so it is safe to send our updated
686 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
687 struct lttng_ht_iter iter
;
688 struct consumer_socket
*socket
;
691 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
692 &iter
.iter
, socket
, node
.node
) {
693 pthread_mutex_lock(socket
->lock
);
694 ret
= kernel_consumer_send_channel_stream(socket
,
696 session
->output_traces
? 1 : 0);
697 pthread_mutex_unlock(socket
->lock
);
708 session_unlock(session
);
710 session_unlock_list();
714 session_unlock(session
);
715 session_unlock_list();
720 * For each tracing session, update newly registered apps. The session list
721 * lock MUST be acquired before calling this.
723 static void update_ust_app(int app_sock
)
725 struct ltt_session
*sess
, *stmp
;
727 /* Consumer is in an ERROR state. Stop any application update. */
728 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
729 /* Stop the update process since the consumer is dead. */
733 /* For all tracing session(s) */
734 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
736 if (sess
->ust_session
) {
737 ust_app_global_update(sess
->ust_session
, app_sock
);
739 session_unlock(sess
);
744 * This thread manage event coming from the kernel.
746 * Features supported in this thread:
749 static void *thread_manage_kernel(void *data
)
751 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
752 uint32_t revents
, nb_fd
;
754 struct lttng_poll_event events
;
756 DBG("[thread] Thread manage kernel started");
758 health_register(HEALTH_TYPE_KERNEL
);
761 * This first step of the while is to clean this structure which could free
762 * non NULL pointers so initialize it before the loop.
764 lttng_poll_init(&events
);
766 if (testpoint(thread_manage_kernel
)) {
767 goto error_testpoint
;
770 health_code_update();
772 if (testpoint(thread_manage_kernel_before_loop
)) {
773 goto error_testpoint
;
777 health_code_update();
779 if (update_poll_flag
== 1) {
780 /* Clean events object. We are about to populate it again. */
781 lttng_poll_clean(&events
);
783 ret
= sessiond_set_thread_pollset(&events
, 2);
785 goto error_poll_create
;
788 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
793 /* This will add the available kernel channel if any. */
794 ret
= update_kernel_poll(&events
);
798 update_poll_flag
= 0;
801 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
803 /* Poll infinite value of time */
806 ret
= lttng_poll_wait(&events
, -1);
810 * Restart interrupted system call.
812 if (errno
== EINTR
) {
816 } else if (ret
== 0) {
817 /* Should not happen since timeout is infinite */
818 ERR("Return value of poll is 0 with an infinite timeout.\n"
819 "This should not have happened! Continuing...");
825 for (i
= 0; i
< nb_fd
; i
++) {
826 /* Fetch once the poll data */
827 revents
= LTTNG_POLL_GETEV(&events
, i
);
828 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
830 health_code_update();
832 /* Thread quit pipe has been closed. Killing thread. */
833 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
839 /* Check for data on kernel pipe */
840 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
842 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
843 } while (ret
< 0 && errno
== EINTR
);
845 * Ret value is useless here, if this pipe gets any actions an
846 * update is required anyway.
848 update_poll_flag
= 1;
852 * New CPU detected by the kernel. Adding kernel stream to
853 * kernel session and updating the kernel consumer
855 if (revents
& LPOLLIN
) {
856 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
862 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
863 * and unregister kernel stream at this point.
872 lttng_poll_clean(&events
);
875 utils_close_pipe(kernel_poll_pipe
);
876 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
879 ERR("Health error occurred in %s", __func__
);
880 WARN("Kernel thread died unexpectedly. "
881 "Kernel tracing can continue but CPU hotplug is disabled.");
884 DBG("Kernel thread dying");
889 * Signal pthread condition of the consumer data that the thread.
891 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
893 pthread_mutex_lock(&data
->cond_mutex
);
896 * The state is set before signaling. It can be any value, it's the waiter
897 * job to correctly interpret this condition variable associated to the
898 * consumer pthread_cond.
900 * A value of 0 means that the corresponding thread of the consumer data
901 * was not started. 1 indicates that the thread has started and is ready
902 * for action. A negative value means that there was an error during the
905 data
->consumer_thread_is_ready
= state
;
906 (void) pthread_cond_signal(&data
->cond
);
908 pthread_mutex_unlock(&data
->cond_mutex
);
912 * This thread manage the consumer error sent back to the session daemon.
914 static void *thread_manage_consumer(void *data
)
916 int sock
= -1, i
, ret
, pollfd
, err
= -1;
917 uint32_t revents
, nb_fd
;
918 enum lttcomm_return_code code
;
919 struct lttng_poll_event events
;
920 struct consumer_data
*consumer_data
= data
;
922 DBG("[thread] Manage consumer started");
924 health_register(HEALTH_TYPE_CONSUMER
);
926 health_code_update();
929 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
930 * metadata_sock. Nothing more will be added to this poll set.
932 ret
= sessiond_set_thread_pollset(&events
, 3);
938 * The error socket here is already in a listening state which was done
939 * just before spawning this thread to avoid a race between the consumer
940 * daemon exec trying to connect and the listen() call.
942 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
947 health_code_update();
949 /* Infinite blocking call, waiting for transmission */
953 if (testpoint(thread_manage_consumer
)) {
957 ret
= lttng_poll_wait(&events
, -1);
961 * Restart interrupted system call.
963 if (errno
== EINTR
) {
971 for (i
= 0; i
< nb_fd
; i
++) {
972 /* Fetch once the poll data */
973 revents
= LTTNG_POLL_GETEV(&events
, i
);
974 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
976 health_code_update();
978 /* Thread quit pipe has been closed. Killing thread. */
979 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
985 /* Event on the registration socket */
986 if (pollfd
== consumer_data
->err_sock
) {
987 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
988 ERR("consumer err socket poll error");
994 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1000 * Set the CLOEXEC flag. Return code is useless because either way, the
1003 (void) utils_set_fd_cloexec(sock
);
1005 health_code_update();
1007 DBG2("Receiving code from consumer err_sock");
1009 /* Getting status code from kconsumerd */
1010 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1011 sizeof(enum lttcomm_return_code
));
1016 health_code_update();
1018 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1019 /* Connect both socket, command and metadata. */
1020 consumer_data
->cmd_sock
=
1021 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1022 consumer_data
->metadata_fd
=
1023 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1024 if (consumer_data
->cmd_sock
< 0 || consumer_data
->metadata_fd
< 0) {
1025 PERROR("consumer connect cmd socket");
1026 /* On error, signal condition and quit. */
1027 signal_consumer_condition(consumer_data
, -1);
1030 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1031 /* Create metadata socket lock. */
1032 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1033 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1034 PERROR("zmalloc pthread mutex");
1038 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1040 signal_consumer_condition(consumer_data
, 1);
1041 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1042 DBG("Consumer metadata socket ready (fd: %d)",
1043 consumer_data
->metadata_fd
);
1045 ERR("consumer error when waiting for SOCK_READY : %s",
1046 lttcomm_get_readable_code(-code
));
1050 /* Remove the consumerd error sock since we've established a connexion */
1051 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1056 /* Add new accepted error socket. */
1057 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1062 /* Add metadata socket that is successfully connected. */
1063 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1064 LPOLLIN
| LPOLLRDHUP
);
1069 health_code_update();
1071 /* Infinite blocking call, waiting for transmission */
1074 health_poll_entry();
1075 ret
= lttng_poll_wait(&events
, -1);
1079 * Restart interrupted system call.
1081 if (errno
== EINTR
) {
1089 for (i
= 0; i
< nb_fd
; i
++) {
1090 /* Fetch once the poll data */
1091 revents
= LTTNG_POLL_GETEV(&events
, i
);
1092 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1094 health_code_update();
1096 /* Thread quit pipe has been closed. Killing thread. */
1097 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1103 if (pollfd
== sock
) {
1104 /* Event on the consumerd socket */
1105 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1106 ERR("consumer err socket second poll error");
1109 health_code_update();
1110 /* Wait for any kconsumerd error */
1111 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1112 sizeof(enum lttcomm_return_code
));
1114 ERR("consumer closed the command socket");
1118 ERR("consumer return code : %s",
1119 lttcomm_get_readable_code(-code
));
1122 } else if (pollfd
== consumer_data
->metadata_fd
) {
1123 /* UST metadata requests */
1124 ret
= ust_consumer_metadata_request(
1125 &consumer_data
->metadata_sock
);
1127 ERR("Handling metadata request");
1132 ERR("Unknown pollfd");
1136 health_code_update();
1142 * We lock here because we are about to close the sockets and some other
1143 * thread might be using them so wait before we are exclusive which will
1144 * abort all other consumer command by other threads.
1146 pthread_mutex_lock(&consumer_data
->lock
);
1148 /* Immediately set the consumerd state to stopped */
1149 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1150 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1151 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1152 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1153 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1155 /* Code flow error... */
1159 if (consumer_data
->err_sock
>= 0) {
1160 ret
= close(consumer_data
->err_sock
);
1164 consumer_data
->err_sock
= -1;
1166 if (consumer_data
->cmd_sock
>= 0) {
1167 ret
= close(consumer_data
->cmd_sock
);
1171 consumer_data
->cmd_sock
= -1;
1173 if (*consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1174 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1187 unlink(consumer_data
->err_unix_sock_path
);
1188 unlink(consumer_data
->cmd_unix_sock_path
);
1189 consumer_data
->pid
= 0;
1190 pthread_mutex_unlock(&consumer_data
->lock
);
1191 /* Cleanup metadata socket mutex. */
1192 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1193 free(consumer_data
->metadata_sock
.lock
);
1195 lttng_poll_clean(&events
);
1199 ERR("Health error occurred in %s", __func__
);
1201 health_unregister();
1202 DBG("consumer thread cleanup completed");
1208 * This thread manage application communication.
1210 static void *thread_manage_apps(void *data
)
1212 int i
, ret
, pollfd
, err
= -1;
1213 uint32_t revents
, nb_fd
;
1214 struct lttng_poll_event events
;
1216 DBG("[thread] Manage application started");
1218 rcu_register_thread();
1219 rcu_thread_online();
1221 health_register(HEALTH_TYPE_APP_MANAGE
);
1223 if (testpoint(thread_manage_apps
)) {
1224 goto error_testpoint
;
1227 health_code_update();
1229 ret
= sessiond_set_thread_pollset(&events
, 2);
1231 goto error_poll_create
;
1234 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1239 if (testpoint(thread_manage_apps_before_loop
)) {
1243 health_code_update();
1246 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1248 /* Inifinite blocking call, waiting for transmission */
1250 health_poll_entry();
1251 ret
= lttng_poll_wait(&events
, -1);
1255 * Restart interrupted system call.
1257 if (errno
== EINTR
) {
1265 for (i
= 0; i
< nb_fd
; i
++) {
1266 /* Fetch once the poll data */
1267 revents
= LTTNG_POLL_GETEV(&events
, i
);
1268 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1270 health_code_update();
1272 /* Thread quit pipe has been closed. Killing thread. */
1273 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1279 /* Inspect the apps cmd pipe */
1280 if (pollfd
== apps_cmd_pipe
[0]) {
1281 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1282 ERR("Apps command pipe error");
1284 } else if (revents
& LPOLLIN
) {
1289 ret
= read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1290 } while (ret
< 0 && errno
== EINTR
);
1291 if (ret
< 0 || ret
< sizeof(sock
)) {
1292 PERROR("read apps cmd pipe");
1296 health_code_update();
1299 * We only monitor the error events of the socket. This
1300 * thread does not handle any incoming data from UST
1303 ret
= lttng_poll_add(&events
, sock
,
1304 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1310 * Set socket timeout for both receiving and ending.
1311 * app_socket_timeout is in seconds, whereas
1312 * lttcomm_setsockopt_rcv_timeout and
1313 * lttcomm_setsockopt_snd_timeout expect msec as
1316 (void) lttcomm_setsockopt_rcv_timeout(sock
,
1317 app_socket_timeout
* 1000);
1318 (void) lttcomm_setsockopt_snd_timeout(sock
,
1319 app_socket_timeout
* 1000);
1321 DBG("Apps with sock %d added to poll set", sock
);
1323 health_code_update();
1329 * At this point, we know that a registered application made
1330 * the event at poll_wait.
1332 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1333 /* Removing from the poll set */
1334 ret
= lttng_poll_del(&events
, pollfd
);
1339 /* Socket closed on remote end. */
1340 ust_app_unregister(pollfd
);
1345 health_code_update();
1351 lttng_poll_clean(&events
);
1354 utils_close_pipe(apps_cmd_pipe
);
1355 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1358 * We don't clean the UST app hash table here since already registered
1359 * applications can still be controlled so let them be until the session
1360 * daemon dies or the applications stop.
1365 ERR("Health error occurred in %s", __func__
);
1367 health_unregister();
1368 DBG("Application communication apps thread cleanup complete");
1369 rcu_thread_offline();
1370 rcu_unregister_thread();
1375 * Send a socket to a thread This is called from the dispatch UST registration
1376 * thread once all sockets are set for the application.
1378 * On success, return 0 else a negative value being the errno message of the
1381 static int send_socket_to_thread(int fd
, int sock
)
1385 /* Sockets MUST be set or else this should not have been called. */
1390 ret
= write(fd
, &sock
, sizeof(sock
));
1391 } while (ret
< 0 && errno
== EINTR
);
1392 if (ret
< 0 || ret
!= sizeof(sock
)) {
1393 PERROR("write apps pipe %d", fd
);
1400 /* All good. Don't send back the write positive ret value. */
1407 * Sanitize the wait queue of the dispatch registration thread meaning removing
1408 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1409 * notify socket is never received.
1411 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1413 int ret
, nb_fd
= 0, i
;
1414 unsigned int fd_added
= 0;
1415 struct lttng_poll_event events
;
1416 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1420 lttng_poll_init(&events
);
1422 /* Just skip everything for an empty queue. */
1423 if (!wait_queue
->count
) {
1427 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1432 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1433 &wait_queue
->head
, head
) {
1434 assert(wait_node
->app
);
1435 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1436 LPOLLHUP
| LPOLLERR
);
1449 * Poll but don't block so we can quickly identify the faulty events and
1450 * clean them afterwards from the wait queue.
1452 ret
= lttng_poll_wait(&events
, 0);
1458 for (i
= 0; i
< nb_fd
; i
++) {
1459 /* Get faulty FD. */
1460 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1461 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1463 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1464 &wait_queue
->head
, head
) {
1465 if (pollfd
== wait_node
->app
->sock
&&
1466 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1467 cds_list_del(&wait_node
->head
);
1468 wait_queue
->count
--;
1469 ust_app_destroy(wait_node
->app
);
1477 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1481 lttng_poll_clean(&events
);
1485 lttng_poll_clean(&events
);
1487 ERR("Unable to sanitize wait queue");
1492 * Dispatch request from the registration threads to the application
1493 * communication thread.
1495 static void *thread_dispatch_ust_registration(void *data
)
1498 struct cds_wfq_node
*node
;
1499 struct ust_command
*ust_cmd
= NULL
;
1500 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1501 struct ust_reg_wait_queue wait_queue
= {
1505 health_register(HEALTH_TYPE_APP_REG_DISPATCH
);
1507 health_code_update();
1509 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1511 DBG("[thread] Dispatch UST command started");
1513 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1514 health_code_update();
1516 /* Atomically prepare the queue futex */
1517 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1520 struct ust_app
*app
= NULL
;
1524 * Make sure we don't have node(s) that have hung up before receiving
1525 * the notify socket. This is to clean the list in order to avoid
1526 * memory leaks from notify socket that are never seen.
1528 sanitize_wait_queue(&wait_queue
);
1530 health_code_update();
1531 /* Dequeue command for registration */
1532 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1534 DBG("Woken up but nothing in the UST command queue");
1535 /* Continue thread execution */
1539 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1541 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1542 " gid:%d sock:%d name:%s (version %d.%d)",
1543 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1544 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1545 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1546 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1548 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1549 wait_node
= zmalloc(sizeof(*wait_node
));
1551 PERROR("zmalloc wait_node dispatch");
1552 ret
= close(ust_cmd
->sock
);
1554 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1556 lttng_fd_put(1, LTTNG_FD_APPS
);
1560 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1562 /* Create application object if socket is CMD. */
1563 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1565 if (!wait_node
->app
) {
1566 ret
= close(ust_cmd
->sock
);
1568 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1570 lttng_fd_put(1, LTTNG_FD_APPS
);
1576 * Add application to the wait queue so we can set the notify
1577 * socket before putting this object in the global ht.
1579 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1584 * We have to continue here since we don't have the notify
1585 * socket and the application MUST be added to the hash table
1586 * only at that moment.
1591 * Look for the application in the local wait queue and set the
1592 * notify socket if found.
1594 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1595 &wait_queue
.head
, head
) {
1596 health_code_update();
1597 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1598 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1599 cds_list_del(&wait_node
->head
);
1601 app
= wait_node
->app
;
1603 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1609 * With no application at this stage the received socket is
1610 * basically useless so close it before we free the cmd data
1611 * structure for good.
1614 ret
= close(ust_cmd
->sock
);
1616 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1618 lttng_fd_put(1, LTTNG_FD_APPS
);
1625 * @session_lock_list
1627 * Lock the global session list so from the register up to the
1628 * registration done message, no thread can see the application
1629 * and change its state.
1631 session_lock_list();
1635 * Add application to the global hash table. This needs to be
1636 * done before the update to the UST registry can locate the
1641 /* Set app version. This call will print an error if needed. */
1642 (void) ust_app_version(app
);
1644 /* Send notify socket through the notify pipe. */
1645 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1649 session_unlock_list();
1650 /* No notify thread, stop the UST tracing. */
1655 * Update newly registered application with the tracing
1656 * registry info already enabled information.
1658 update_ust_app(app
->sock
);
1661 * Don't care about return value. Let the manage apps threads
1662 * handle app unregistration upon socket close.
1664 (void) ust_app_register_done(app
->sock
);
1667 * Even if the application socket has been closed, send the app
1668 * to the thread and unregistration will take place at that
1671 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1674 session_unlock_list();
1675 /* No apps. thread, stop the UST tracing. */
1680 session_unlock_list();
1682 } while (node
!= NULL
);
1684 health_poll_entry();
1685 /* Futex wait on queue. Blocking call on futex() */
1686 futex_nto1_wait(&ust_cmd_queue
.futex
);
1689 /* Normal exit, no error */
1693 /* Clean up wait queue. */
1694 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1695 &wait_queue
.head
, head
) {
1696 cds_list_del(&wait_node
->head
);
1701 DBG("Dispatch thread dying");
1704 ERR("Health error occurred in %s", __func__
);
1706 health_unregister();
1711 * This thread manage application registration.
1713 static void *thread_registration_apps(void *data
)
1715 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1716 uint32_t revents
, nb_fd
;
1717 struct lttng_poll_event events
;
1719 * Get allocated in this thread, enqueued to a global queue, dequeued and
1720 * freed in the manage apps thread.
1722 struct ust_command
*ust_cmd
= NULL
;
1724 DBG("[thread] Manage application registration started");
1726 health_register(HEALTH_TYPE_APP_REG
);
1728 if (testpoint(thread_registration_apps
)) {
1729 goto error_testpoint
;
1732 ret
= lttcomm_listen_unix_sock(apps_sock
);
1738 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1739 * more will be added to this poll set.
1741 ret
= sessiond_set_thread_pollset(&events
, 2);
1743 goto error_create_poll
;
1746 /* Add the application registration socket */
1747 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1749 goto error_poll_add
;
1752 /* Notify all applications to register */
1753 ret
= notify_ust_apps(1);
1755 ERR("Failed to notify applications or create the wait shared memory.\n"
1756 "Execution continues but there might be problem for already\n"
1757 "running applications that wishes to register.");
1761 DBG("Accepting application registration");
1763 /* Inifinite blocking call, waiting for transmission */
1765 health_poll_entry();
1766 ret
= lttng_poll_wait(&events
, -1);
1770 * Restart interrupted system call.
1772 if (errno
== EINTR
) {
1780 for (i
= 0; i
< nb_fd
; i
++) {
1781 health_code_update();
1783 /* Fetch once the poll data */
1784 revents
= LTTNG_POLL_GETEV(&events
, i
);
1785 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1787 /* Thread quit pipe has been closed. Killing thread. */
1788 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1794 /* Event on the registration socket */
1795 if (pollfd
== apps_sock
) {
1796 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1797 ERR("Register apps socket poll error");
1799 } else if (revents
& LPOLLIN
) {
1800 sock
= lttcomm_accept_unix_sock(apps_sock
);
1806 * Set the CLOEXEC flag. Return code is useless because
1807 * either way, the show must go on.
1809 (void) utils_set_fd_cloexec(sock
);
1811 /* Create UST registration command for enqueuing */
1812 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1813 if (ust_cmd
== NULL
) {
1814 PERROR("ust command zmalloc");
1819 * Using message-based transmissions to ensure we don't
1820 * have to deal with partially received messages.
1822 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1824 ERR("Exhausted file descriptors allowed for applications.");
1834 health_code_update();
1835 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
1838 /* Close socket of the application. */
1843 lttng_fd_put(LTTNG_FD_APPS
, 1);
1847 health_code_update();
1849 ust_cmd
->sock
= sock
;
1852 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1853 " gid:%d sock:%d name:%s (version %d.%d)",
1854 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1855 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1856 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1857 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1860 * Lock free enqueue the registration request. The red pill
1861 * has been taken! This apps will be part of the *system*.
1863 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1866 * Wake the registration queue futex. Implicit memory
1867 * barrier with the exchange in cds_wfq_enqueue.
1869 futex_nto1_wake(&ust_cmd_queue
.futex
);
1879 ERR("Health error occurred in %s", __func__
);
1882 /* Notify that the registration thread is gone */
1885 if (apps_sock
>= 0) {
1886 ret
= close(apps_sock
);
1896 lttng_fd_put(LTTNG_FD_APPS
, 1);
1898 unlink(apps_unix_sock_path
);
1901 lttng_poll_clean(&events
);
1905 DBG("UST Registration thread cleanup complete");
1906 health_unregister();
1912 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1913 * exec or it will fails.
1915 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1918 struct timespec timeout
;
1920 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1921 consumer_data
->consumer_thread_is_ready
= 0;
1923 /* Setup pthread condition */
1924 ret
= pthread_condattr_init(&consumer_data
->condattr
);
1927 PERROR("pthread_condattr_init consumer data");
1932 * Set the monotonic clock in order to make sure we DO NOT jump in time
1933 * between the clock_gettime() call and the timedwait call. See bug #324
1934 * for a more details and how we noticed it.
1936 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
1939 PERROR("pthread_condattr_setclock consumer data");
1943 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
1946 PERROR("pthread_cond_init consumer data");
1950 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
1953 PERROR("pthread_create consumer");
1958 /* We are about to wait on a pthread condition */
1959 pthread_mutex_lock(&consumer_data
->cond_mutex
);
1961 /* Get time for sem_timedwait absolute timeout */
1962 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
1964 * Set the timeout for the condition timed wait even if the clock gettime
1965 * call fails since we might loop on that call and we want to avoid to
1966 * increment the timeout too many times.
1968 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1971 * The following loop COULD be skipped in some conditions so this is why we
1972 * set ret to 0 in order to make sure at least one round of the loop is
1978 * Loop until the condition is reached or when a timeout is reached. Note
1979 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1980 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1981 * possible. This loop does not take any chances and works with both of
1984 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
1985 if (clock_ret
< 0) {
1986 PERROR("clock_gettime spawn consumer");
1987 /* Infinite wait for the consumerd thread to be ready */
1988 ret
= pthread_cond_wait(&consumer_data
->cond
,
1989 &consumer_data
->cond_mutex
);
1991 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
1992 &consumer_data
->cond_mutex
, &timeout
);
1996 /* Release the pthread condition */
1997 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2001 if (ret
== ETIMEDOUT
) {
2003 * Call has timed out so we kill the kconsumerd_thread and return
2006 ERR("Condition timed out. The consumer thread was never ready."
2008 ret
= pthread_cancel(consumer_data
->thread
);
2010 PERROR("pthread_cancel consumer thread");
2013 PERROR("pthread_cond_wait failed consumer thread");
2018 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2019 if (consumer_data
->pid
== 0) {
2020 ERR("Consumerd did not start");
2021 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2024 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2033 * Join consumer thread
2035 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2039 /* Consumer pid must be a real one. */
2040 if (consumer_data
->pid
> 0) {
2042 ret
= kill(consumer_data
->pid
, SIGTERM
);
2044 ERR("Error killing consumer daemon");
2047 return pthread_join(consumer_data
->thread
, &status
);
2054 * Fork and exec a consumer daemon (consumerd).
2056 * Return pid if successful else -1.
2058 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2062 const char *consumer_to_use
;
2063 const char *verbosity
;
2066 DBG("Spawning consumerd");
2073 if (opt_verbose_consumer
) {
2074 verbosity
= "--verbose";
2076 verbosity
= "--quiet";
2078 switch (consumer_data
->type
) {
2079 case LTTNG_CONSUMER_KERNEL
:
2081 * Find out which consumerd to execute. We will first try the
2082 * 64-bit path, then the sessiond's installation directory, and
2083 * fallback on the 32-bit one,
2085 DBG3("Looking for a kernel consumer at these locations:");
2086 DBG3(" 1) %s", consumerd64_bin
);
2087 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2088 DBG3(" 3) %s", consumerd32_bin
);
2089 if (stat(consumerd64_bin
, &st
) == 0) {
2090 DBG3("Found location #1");
2091 consumer_to_use
= consumerd64_bin
;
2092 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2093 DBG3("Found location #2");
2094 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2095 } else if (stat(consumerd32_bin
, &st
) == 0) {
2096 DBG3("Found location #3");
2097 consumer_to_use
= consumerd32_bin
;
2099 DBG("Could not find any valid consumerd executable");
2102 DBG("Using kernel consumer at: %s", consumer_to_use
);
2103 execl(consumer_to_use
,
2104 "lttng-consumerd", verbosity
, "-k",
2105 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2106 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2109 case LTTNG_CONSUMER64_UST
:
2111 char *tmpnew
= NULL
;
2113 if (consumerd64_libdir
[0] != '\0') {
2117 tmp
= getenv("LD_LIBRARY_PATH");
2121 tmplen
= strlen("LD_LIBRARY_PATH=")
2122 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2123 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2128 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2129 strcat(tmpnew
, consumerd64_libdir
);
2130 if (tmp
[0] != '\0') {
2131 strcat(tmpnew
, ":");
2132 strcat(tmpnew
, tmp
);
2134 ret
= putenv(tmpnew
);
2141 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2142 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2143 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2144 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2146 if (consumerd64_libdir
[0] != '\0') {
2154 case LTTNG_CONSUMER32_UST
:
2156 char *tmpnew
= NULL
;
2158 if (consumerd32_libdir
[0] != '\0') {
2162 tmp
= getenv("LD_LIBRARY_PATH");
2166 tmplen
= strlen("LD_LIBRARY_PATH=")
2167 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2168 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2173 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2174 strcat(tmpnew
, consumerd32_libdir
);
2175 if (tmp
[0] != '\0') {
2176 strcat(tmpnew
, ":");
2177 strcat(tmpnew
, tmp
);
2179 ret
= putenv(tmpnew
);
2186 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2187 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2188 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2189 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2191 if (consumerd32_libdir
[0] != '\0') {
2200 PERROR("unknown consumer type");
2204 PERROR("kernel start consumer exec");
2207 } else if (pid
> 0) {
2210 PERROR("start consumer fork");
2218 * Spawn the consumerd daemon and session daemon thread.
2220 static int start_consumerd(struct consumer_data
*consumer_data
)
2225 * Set the listen() state on the socket since there is a possible race
2226 * between the exec() of the consumer daemon and this call if place in the
2227 * consumer thread. See bug #366 for more details.
2229 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2234 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2235 if (consumer_data
->pid
!= 0) {
2236 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2240 ret
= spawn_consumerd(consumer_data
);
2242 ERR("Spawning consumerd failed");
2243 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2247 /* Setting up the consumer_data pid */
2248 consumer_data
->pid
= ret
;
2249 DBG2("Consumer pid %d", consumer_data
->pid
);
2250 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2252 DBG2("Spawning consumer control thread");
2253 ret
= spawn_consumer_thread(consumer_data
);
2255 ERR("Fatal error spawning consumer control thread");
2263 /* Cleanup already created sockets on error. */
2264 if (consumer_data
->err_sock
>= 0) {
2267 err
= close(consumer_data
->err_sock
);
2269 PERROR("close consumer data error socket");
2276 * Compute health status of each consumer. If one of them is zero (bad
2277 * state), we return 0.
2279 static int check_consumer_health(void)
2283 ret
= health_check_state(HEALTH_TYPE_CONSUMER
);
2285 DBG3("Health consumer check %d", ret
);
2291 * Setup necessary data for kernel tracer action.
2293 static int init_kernel_tracer(void)
2297 /* Modprobe lttng kernel modules */
2298 ret
= modprobe_lttng_control();
2303 /* Open debugfs lttng */
2304 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2305 if (kernel_tracer_fd
< 0) {
2306 DBG("Failed to open %s", module_proc_lttng
);
2311 /* Validate kernel version */
2312 ret
= kernel_validate_version(kernel_tracer_fd
);
2317 ret
= modprobe_lttng_data();
2322 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2326 modprobe_remove_lttng_control();
2327 ret
= close(kernel_tracer_fd
);
2331 kernel_tracer_fd
= -1;
2332 return LTTNG_ERR_KERN_VERSION
;
2335 ret
= close(kernel_tracer_fd
);
2341 modprobe_remove_lttng_control();
2344 WARN("No kernel tracer available");
2345 kernel_tracer_fd
= -1;
2347 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2349 return LTTNG_ERR_KERN_NA
;
2355 * Copy consumer output from the tracing session to the domain session. The
2356 * function also applies the right modification on a per domain basis for the
2357 * trace files destination directory.
2359 * Should *NOT* be called with RCU read-side lock held.
2361 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2364 const char *dir_name
;
2365 struct consumer_output
*consumer
;
2368 assert(session
->consumer
);
2371 case LTTNG_DOMAIN_KERNEL
:
2372 DBG3("Copying tracing session consumer output in kernel session");
2374 * XXX: We should audit the session creation and what this function
2375 * does "extra" in order to avoid a destroy since this function is used
2376 * in the domain session creation (kernel and ust) only. Same for UST
2379 if (session
->kernel_session
->consumer
) {
2380 consumer_destroy_output(session
->kernel_session
->consumer
);
2382 session
->kernel_session
->consumer
=
2383 consumer_copy_output(session
->consumer
);
2384 /* Ease our life a bit for the next part */
2385 consumer
= session
->kernel_session
->consumer
;
2386 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2388 case LTTNG_DOMAIN_UST
:
2389 DBG3("Copying tracing session consumer output in UST session");
2390 if (session
->ust_session
->consumer
) {
2391 consumer_destroy_output(session
->ust_session
->consumer
);
2393 session
->ust_session
->consumer
=
2394 consumer_copy_output(session
->consumer
);
2395 /* Ease our life a bit for the next part */
2396 consumer
= session
->ust_session
->consumer
;
2397 dir_name
= DEFAULT_UST_TRACE_DIR
;
2400 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2404 /* Append correct directory to subdir */
2405 strncat(consumer
->subdir
, dir_name
,
2406 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2407 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2416 * Create an UST session and add it to the session ust list.
2418 * Should *NOT* be called with RCU read-side lock held.
2420 static int create_ust_session(struct ltt_session
*session
,
2421 struct lttng_domain
*domain
)
2424 struct ltt_ust_session
*lus
= NULL
;
2428 assert(session
->consumer
);
2430 switch (domain
->type
) {
2431 case LTTNG_DOMAIN_UST
:
2434 ERR("Unknown UST domain on create session %d", domain
->type
);
2435 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2439 DBG("Creating UST session");
2441 lus
= trace_ust_create_session(session
->id
);
2443 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2447 lus
->uid
= session
->uid
;
2448 lus
->gid
= session
->gid
;
2449 lus
->output_traces
= session
->output_traces
;
2450 lus
->snapshot_mode
= session
->snapshot_mode
;
2451 session
->ust_session
= lus
;
2453 /* Copy session output to the newly created UST session */
2454 ret
= copy_session_consumer(domain
->type
, session
);
2455 if (ret
!= LTTNG_OK
) {
2463 session
->ust_session
= NULL
;
2468 * Create a kernel tracer session then create the default channel.
2470 static int create_kernel_session(struct ltt_session
*session
)
2474 DBG("Creating kernel session");
2476 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2478 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2482 /* Code flow safety */
2483 assert(session
->kernel_session
);
2485 /* Copy session output to the newly created Kernel session */
2486 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2487 if (ret
!= LTTNG_OK
) {
2491 /* Create directory(ies) on local filesystem. */
2492 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2493 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2494 ret
= run_as_mkdir_recursive(
2495 session
->kernel_session
->consumer
->dst
.trace_path
,
2496 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2498 if (ret
!= -EEXIST
) {
2499 ERR("Trace directory creation error");
2505 session
->kernel_session
->uid
= session
->uid
;
2506 session
->kernel_session
->gid
= session
->gid
;
2507 session
->kernel_session
->output_traces
= session
->output_traces
;
2508 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2513 trace_kernel_destroy_session(session
->kernel_session
);
2514 session
->kernel_session
= NULL
;
2519 * Count number of session permitted by uid/gid.
2521 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2524 struct ltt_session
*session
;
2526 DBG("Counting number of available session for UID %d GID %d",
2528 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2530 * Only list the sessions the user can control.
2532 if (!session_access_ok(session
, uid
, gid
)) {
2541 * Process the command requested by the lttng client within the command
2542 * context structure. This function make sure that the return structure (llm)
2543 * is set and ready for transmission before returning.
2545 * Return any error encountered or 0 for success.
2547 * "sock" is only used for special-case var. len data.
2549 * Should *NOT* be called with RCU read-side lock held.
2551 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2555 int need_tracing_session
= 1;
2558 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2562 switch (cmd_ctx
->lsm
->cmd_type
) {
2563 case LTTNG_CREATE_SESSION
:
2564 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2565 case LTTNG_DESTROY_SESSION
:
2566 case LTTNG_LIST_SESSIONS
:
2567 case LTTNG_LIST_DOMAINS
:
2568 case LTTNG_START_TRACE
:
2569 case LTTNG_STOP_TRACE
:
2570 case LTTNG_DATA_PENDING
:
2571 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2572 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2573 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2574 case LTTNG_SNAPSHOT_RECORD
:
2581 if (opt_no_kernel
&& need_domain
2582 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2584 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2586 ret
= LTTNG_ERR_KERN_NA
;
2591 /* Deny register consumer if we already have a spawned consumer. */
2592 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2593 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2594 if (kconsumer_data
.pid
> 0) {
2595 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2596 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2599 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2603 * Check for command that don't needs to allocate a returned payload. We do
2604 * this here so we don't have to make the call for no payload at each
2607 switch(cmd_ctx
->lsm
->cmd_type
) {
2608 case LTTNG_LIST_SESSIONS
:
2609 case LTTNG_LIST_TRACEPOINTS
:
2610 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2611 case LTTNG_LIST_DOMAINS
:
2612 case LTTNG_LIST_CHANNELS
:
2613 case LTTNG_LIST_EVENTS
:
2616 /* Setup lttng message with no payload */
2617 ret
= setup_lttng_msg(cmd_ctx
, 0);
2619 /* This label does not try to unlock the session */
2620 goto init_setup_error
;
2624 /* Commands that DO NOT need a session. */
2625 switch (cmd_ctx
->lsm
->cmd_type
) {
2626 case LTTNG_CREATE_SESSION
:
2627 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2628 case LTTNG_CALIBRATE
:
2629 case LTTNG_LIST_SESSIONS
:
2630 case LTTNG_LIST_TRACEPOINTS
:
2631 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2632 need_tracing_session
= 0;
2635 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2637 * We keep the session list lock across _all_ commands
2638 * for now, because the per-session lock does not
2639 * handle teardown properly.
2641 session_lock_list();
2642 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2643 if (cmd_ctx
->session
== NULL
) {
2644 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2647 /* Acquire lock for the session */
2648 session_lock(cmd_ctx
->session
);
2658 * Check domain type for specific "pre-action".
2660 switch (cmd_ctx
->lsm
->domain
.type
) {
2661 case LTTNG_DOMAIN_KERNEL
:
2663 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2667 /* Kernel tracer check */
2668 if (kernel_tracer_fd
== -1) {
2669 /* Basically, load kernel tracer modules */
2670 ret
= init_kernel_tracer();
2676 /* Consumer is in an ERROR state. Report back to client */
2677 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2678 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2682 /* Need a session for kernel command */
2683 if (need_tracing_session
) {
2684 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2685 ret
= create_kernel_session(cmd_ctx
->session
);
2687 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2692 /* Start the kernel consumer daemon */
2693 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2694 if (kconsumer_data
.pid
== 0 &&
2695 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2696 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2697 ret
= start_consumerd(&kconsumer_data
);
2699 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2702 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2704 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2708 * The consumer was just spawned so we need to add the socket to
2709 * the consumer output of the session if exist.
2711 ret
= consumer_create_socket(&kconsumer_data
,
2712 cmd_ctx
->session
->kernel_session
->consumer
);
2719 case LTTNG_DOMAIN_UST
:
2721 if (!ust_app_supported()) {
2722 ret
= LTTNG_ERR_NO_UST
;
2725 /* Consumer is in an ERROR state. Report back to client */
2726 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2727 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2731 if (need_tracing_session
) {
2732 /* Create UST session if none exist. */
2733 if (cmd_ctx
->session
->ust_session
== NULL
) {
2734 ret
= create_ust_session(cmd_ctx
->session
,
2735 &cmd_ctx
->lsm
->domain
);
2736 if (ret
!= LTTNG_OK
) {
2741 /* Start the UST consumer daemons */
2743 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2744 if (consumerd64_bin
[0] != '\0' &&
2745 ustconsumer64_data
.pid
== 0 &&
2746 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2747 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2748 ret
= start_consumerd(&ustconsumer64_data
);
2750 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2751 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2755 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2756 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2758 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2762 * Setup socket for consumer 64 bit. No need for atomic access
2763 * since it was set above and can ONLY be set in this thread.
2765 ret
= consumer_create_socket(&ustconsumer64_data
,
2766 cmd_ctx
->session
->ust_session
->consumer
);
2772 if (consumerd32_bin
[0] != '\0' &&
2773 ustconsumer32_data
.pid
== 0 &&
2774 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2775 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2776 ret
= start_consumerd(&ustconsumer32_data
);
2778 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2779 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2783 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2784 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2786 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2790 * Setup socket for consumer 64 bit. No need for atomic access
2791 * since it was set above and can ONLY be set in this thread.
2793 ret
= consumer_create_socket(&ustconsumer32_data
,
2794 cmd_ctx
->session
->ust_session
->consumer
);
2806 /* Validate consumer daemon state when start/stop trace command */
2807 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2808 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2809 switch (cmd_ctx
->lsm
->domain
.type
) {
2810 case LTTNG_DOMAIN_UST
:
2811 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2812 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2816 case LTTNG_DOMAIN_KERNEL
:
2817 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2818 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2826 * Check that the UID or GID match that of the tracing session.
2827 * The root user can interact with all sessions.
2829 if (need_tracing_session
) {
2830 if (!session_access_ok(cmd_ctx
->session
,
2831 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2832 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2833 ret
= LTTNG_ERR_EPERM
;
2839 * Send relayd information to consumer as soon as we have a domain and a
2842 if (cmd_ctx
->session
&& need_domain
) {
2844 * Setup relayd if not done yet. If the relayd information was already
2845 * sent to the consumer, this call will gracefully return.
2847 ret
= cmd_setup_relayd(cmd_ctx
->session
);
2848 if (ret
!= LTTNG_OK
) {
2853 /* Process by command type */
2854 switch (cmd_ctx
->lsm
->cmd_type
) {
2855 case LTTNG_ADD_CONTEXT
:
2857 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2858 cmd_ctx
->lsm
->u
.context
.channel_name
,
2859 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2862 case LTTNG_DISABLE_CHANNEL
:
2864 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2865 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2868 case LTTNG_DISABLE_EVENT
:
2870 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2871 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2872 cmd_ctx
->lsm
->u
.disable
.name
);
2875 case LTTNG_DISABLE_ALL_EVENT
:
2877 DBG("Disabling all events");
2879 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2880 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2883 case LTTNG_ENABLE_CHANNEL
:
2885 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2886 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2889 case LTTNG_ENABLE_EVENT
:
2891 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2892 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2893 &cmd_ctx
->lsm
->u
.enable
.event
, NULL
, kernel_poll_pipe
[1]);
2896 case LTTNG_ENABLE_ALL_EVENT
:
2898 DBG("Enabling all events");
2900 ret
= cmd_enable_event_all(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2901 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2902 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
2905 case LTTNG_LIST_TRACEPOINTS
:
2907 struct lttng_event
*events
;
2910 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2911 if (nb_events
< 0) {
2912 /* Return value is a negative lttng_error_code. */
2918 * Setup lttng message with payload size set to the event list size in
2919 * bytes and then copy list into the llm payload.
2921 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2927 /* Copy event list into message payload */
2928 memcpy(cmd_ctx
->llm
->payload
, events
,
2929 sizeof(struct lttng_event
) * nb_events
);
2936 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2938 struct lttng_event_field
*fields
;
2941 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2943 if (nb_fields
< 0) {
2944 /* Return value is a negative lttng_error_code. */
2950 * Setup lttng message with payload size set to the event list size in
2951 * bytes and then copy list into the llm payload.
2953 ret
= setup_lttng_msg(cmd_ctx
,
2954 sizeof(struct lttng_event_field
) * nb_fields
);
2960 /* Copy event list into message payload */
2961 memcpy(cmd_ctx
->llm
->payload
, fields
,
2962 sizeof(struct lttng_event_field
) * nb_fields
);
2969 case LTTNG_SET_CONSUMER_URI
:
2972 struct lttng_uri
*uris
;
2974 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2975 len
= nb_uri
* sizeof(struct lttng_uri
);
2978 ret
= LTTNG_ERR_INVALID
;
2982 uris
= zmalloc(len
);
2984 ret
= LTTNG_ERR_FATAL
;
2988 /* Receive variable len data */
2989 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
2990 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2992 DBG("No URIs received from client... continuing");
2994 ret
= LTTNG_ERR_SESSION_FAIL
;
2999 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3001 if (ret
!= LTTNG_OK
) {
3007 * XXX: 0 means that this URI should be applied on the session. Should
3008 * be a DOMAIN enuam.
3010 if (cmd_ctx
->lsm
->domain
.type
== 0) {
3011 /* Add the URI for the UST session if a consumer is present. */
3012 if (cmd_ctx
->session
->ust_session
&&
3013 cmd_ctx
->session
->ust_session
->consumer
) {
3014 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
3016 } else if (cmd_ctx
->session
->kernel_session
&&
3017 cmd_ctx
->session
->kernel_session
->consumer
) {
3018 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
3019 cmd_ctx
->session
, nb_uri
, uris
);
3027 case LTTNG_START_TRACE
:
3029 ret
= cmd_start_trace(cmd_ctx
->session
);
3032 case LTTNG_STOP_TRACE
:
3034 ret
= cmd_stop_trace(cmd_ctx
->session
);
3037 case LTTNG_CREATE_SESSION
:
3040 struct lttng_uri
*uris
= NULL
;
3042 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3043 len
= nb_uri
* sizeof(struct lttng_uri
);
3046 uris
= zmalloc(len
);
3048 ret
= LTTNG_ERR_FATAL
;
3052 /* Receive variable len data */
3053 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3054 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3056 DBG("No URIs received from client... continuing");
3058 ret
= LTTNG_ERR_SESSION_FAIL
;
3063 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3064 DBG("Creating session with ONE network URI is a bad call");
3065 ret
= LTTNG_ERR_SESSION_FAIL
;
3071 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3078 case LTTNG_DESTROY_SESSION
:
3080 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3082 /* Set session to NULL so we do not unlock it after free. */
3083 cmd_ctx
->session
= NULL
;
3086 case LTTNG_LIST_DOMAINS
:
3089 struct lttng_domain
*domains
;
3091 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3093 /* Return value is a negative lttng_error_code. */
3098 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3104 /* Copy event list into message payload */
3105 memcpy(cmd_ctx
->llm
->payload
, domains
,
3106 nb_dom
* sizeof(struct lttng_domain
));
3113 case LTTNG_LIST_CHANNELS
:
3116 struct lttng_channel
*channels
;
3118 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3119 cmd_ctx
->session
, &channels
);
3121 /* Return value is a negative lttng_error_code. */
3126 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3132 /* Copy event list into message payload */
3133 memcpy(cmd_ctx
->llm
->payload
, channels
,
3134 nb_chan
* sizeof(struct lttng_channel
));
3141 case LTTNG_LIST_EVENTS
:
3144 struct lttng_event
*events
= NULL
;
3146 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3147 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3149 /* Return value is a negative lttng_error_code. */
3154 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3160 /* Copy event list into message payload */
3161 memcpy(cmd_ctx
->llm
->payload
, events
,
3162 nb_event
* sizeof(struct lttng_event
));
3169 case LTTNG_LIST_SESSIONS
:
3171 unsigned int nr_sessions
;
3173 session_lock_list();
3174 nr_sessions
= lttng_sessions_count(
3175 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3176 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3178 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3180 session_unlock_list();
3184 /* Filled the session array */
3185 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3186 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3187 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3189 session_unlock_list();
3194 case LTTNG_CALIBRATE
:
3196 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3197 &cmd_ctx
->lsm
->u
.calibrate
);
3200 case LTTNG_REGISTER_CONSUMER
:
3202 struct consumer_data
*cdata
;
3204 switch (cmd_ctx
->lsm
->domain
.type
) {
3205 case LTTNG_DOMAIN_KERNEL
:
3206 cdata
= &kconsumer_data
;
3209 ret
= LTTNG_ERR_UND
;
3213 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3214 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3217 case LTTNG_ENABLE_EVENT_WITH_FILTER
:
3219 struct lttng_filter_bytecode
*bytecode
;
3221 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3222 ret
= LTTNG_ERR_FILTER_INVAL
;
3225 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
== 0) {
3226 ret
= LTTNG_ERR_FILTER_INVAL
;
3229 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3231 ret
= LTTNG_ERR_FILTER_NOMEM
;
3234 /* Receive var. len. data */
3235 DBG("Receiving var len data from client ...");
3236 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
3237 cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3239 DBG("Nothing recv() from client var len data... continuing");
3241 ret
= LTTNG_ERR_FILTER_INVAL
;
3245 if (bytecode
->len
+ sizeof(*bytecode
)
3246 != cmd_ctx
->lsm
->u
.enable
.bytecode_len
) {
3248 ret
= LTTNG_ERR_FILTER_INVAL
;
3252 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3253 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3254 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, kernel_poll_pipe
[1]);
3257 case LTTNG_DATA_PENDING
:
3259 ret
= cmd_data_pending(cmd_ctx
->session
);
3262 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3264 struct lttcomm_lttng_output_id reply
;
3266 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3267 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3268 if (ret
!= LTTNG_OK
) {
3272 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3277 /* Copy output list into message payload */
3278 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3282 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3284 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3285 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3288 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3291 struct lttng_snapshot_output
*outputs
= NULL
;
3293 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3294 if (nb_output
< 0) {
3299 ret
= setup_lttng_msg(cmd_ctx
,
3300 nb_output
* sizeof(struct lttng_snapshot_output
));
3307 /* Copy output list into message payload */
3308 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3309 nb_output
* sizeof(struct lttng_snapshot_output
));
3316 case LTTNG_SNAPSHOT_RECORD
:
3318 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3319 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3320 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3323 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3326 struct lttng_uri
*uris
= NULL
;
3328 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3329 len
= nb_uri
* sizeof(struct lttng_uri
);
3332 uris
= zmalloc(len
);
3334 ret
= LTTNG_ERR_FATAL
;
3338 /* Receive variable len data */
3339 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3340 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3342 DBG("No URIs received from client... continuing");
3344 ret
= LTTNG_ERR_SESSION_FAIL
;
3349 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3350 DBG("Creating session with ONE network URI is a bad call");
3351 ret
= LTTNG_ERR_SESSION_FAIL
;
3357 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
3358 nb_uri
, &cmd_ctx
->creds
);
3363 ret
= LTTNG_ERR_UND
;
3368 if (cmd_ctx
->llm
== NULL
) {
3369 DBG("Missing llm structure. Allocating one.");
3370 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3374 /* Set return code */
3375 cmd_ctx
->llm
->ret_code
= ret
;
3377 if (cmd_ctx
->session
) {
3378 session_unlock(cmd_ctx
->session
);
3380 if (need_tracing_session
) {
3381 session_unlock_list();
3388 * Thread managing health check socket.
3390 static void *thread_manage_health(void *data
)
3392 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3393 uint32_t revents
, nb_fd
;
3394 struct lttng_poll_event events
;
3395 struct lttcomm_health_msg msg
;
3396 struct lttcomm_health_data reply
;
3398 DBG("[thread] Manage health check started");
3400 rcu_register_thread();
3402 /* We might hit an error path before this is created. */
3403 lttng_poll_init(&events
);
3405 /* Create unix socket */
3406 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3408 ERR("Unable to create health check Unix socket");
3414 * Set the CLOEXEC flag. Return code is useless because either way, the
3417 (void) utils_set_fd_cloexec(sock
);
3419 ret
= lttcomm_listen_unix_sock(sock
);
3425 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3426 * more will be added to this poll set.
3428 ret
= sessiond_set_thread_pollset(&events
, 2);
3433 /* Add the application registration socket */
3434 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3440 DBG("Health check ready");
3442 /* Inifinite blocking call, waiting for transmission */
3444 ret
= lttng_poll_wait(&events
, -1);
3447 * Restart interrupted system call.
3449 if (errno
== EINTR
) {
3457 for (i
= 0; i
< nb_fd
; i
++) {
3458 /* Fetch once the poll data */
3459 revents
= LTTNG_POLL_GETEV(&events
, i
);
3460 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3462 /* Thread quit pipe has been closed. Killing thread. */
3463 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3469 /* Event on the registration socket */
3470 if (pollfd
== sock
) {
3471 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3472 ERR("Health socket poll error");
3478 new_sock
= lttcomm_accept_unix_sock(sock
);
3484 * Set the CLOEXEC flag. Return code is useless because either way, the
3487 (void) utils_set_fd_cloexec(new_sock
);
3489 DBG("Receiving data from client for health...");
3490 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3492 DBG("Nothing recv() from client... continuing");
3493 ret
= close(new_sock
);
3501 rcu_thread_online();
3503 switch (msg
.component
) {
3504 case LTTNG_HEALTH_CMD
:
3505 reply
.ret_code
= health_check_state(HEALTH_TYPE_CMD
);
3507 case LTTNG_HEALTH_APP_MANAGE
:
3508 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_MANAGE
);
3510 case LTTNG_HEALTH_APP_REG
:
3511 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_REG
);
3513 case LTTNG_HEALTH_KERNEL
:
3514 reply
.ret_code
= health_check_state(HEALTH_TYPE_KERNEL
);
3516 case LTTNG_HEALTH_CONSUMER
:
3517 reply
.ret_code
= check_consumer_health();
3519 case LTTNG_HEALTH_HT_CLEANUP
:
3520 reply
.ret_code
= health_check_state(HEALTH_TYPE_HT_CLEANUP
);
3522 case LTTNG_HEALTH_APP_MANAGE_NOTIFY
:
3523 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY
);
3525 case LTTNG_HEALTH_APP_REG_DISPATCH
:
3526 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_REG_DISPATCH
);
3528 case LTTNG_HEALTH_ALL
:
3530 health_check_state(HEALTH_TYPE_APP_MANAGE
) &&
3531 health_check_state(HEALTH_TYPE_APP_REG
) &&
3532 health_check_state(HEALTH_TYPE_CMD
) &&
3533 health_check_state(HEALTH_TYPE_KERNEL
) &&
3534 check_consumer_health() &&
3535 health_check_state(HEALTH_TYPE_HT_CLEANUP
) &&
3536 health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY
) &&
3537 health_check_state(HEALTH_TYPE_APP_REG_DISPATCH
);
3540 reply
.ret_code
= LTTNG_ERR_UND
;
3545 * Flip ret value since 0 is a success and 1 indicates a bad health for
3546 * the client where in the sessiond it is the opposite. Again, this is
3547 * just to make things easier for us poor developer which enjoy a lot
3550 if (reply
.ret_code
== 0 || reply
.ret_code
== 1) {
3551 reply
.ret_code
= !reply
.ret_code
;
3554 DBG2("Health check return value %d", reply
.ret_code
);
3556 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3558 ERR("Failed to send health data back to client");
3561 /* End of transmission */
3562 ret
= close(new_sock
);
3572 ERR("Health error occurred in %s", __func__
);
3574 DBG("Health check thread dying");
3575 unlink(health_unix_sock_path
);
3583 lttng_poll_clean(&events
);
3585 rcu_unregister_thread();
3590 * This thread manage all clients request using the unix client socket for
3593 static void *thread_manage_clients(void *data
)
3595 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3597 uint32_t revents
, nb_fd
;
3598 struct command_ctx
*cmd_ctx
= NULL
;
3599 struct lttng_poll_event events
;
3601 DBG("[thread] Manage client started");
3603 rcu_register_thread();
3605 health_register(HEALTH_TYPE_CMD
);
3607 if (testpoint(thread_manage_clients
)) {
3608 goto error_testpoint
;
3611 health_code_update();
3613 ret
= lttcomm_listen_unix_sock(client_sock
);
3619 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3620 * more will be added to this poll set.
3622 ret
= sessiond_set_thread_pollset(&events
, 2);
3624 goto error_create_poll
;
3627 /* Add the application registration socket */
3628 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3634 * Notify parent pid that we are ready to accept command for client side.
3636 if (opt_sig_parent
) {
3637 kill(ppid
, SIGUSR1
);
3640 if (testpoint(thread_manage_clients_before_loop
)) {
3644 health_code_update();
3647 DBG("Accepting client command ...");
3649 /* Inifinite blocking call, waiting for transmission */
3651 health_poll_entry();
3652 ret
= lttng_poll_wait(&events
, -1);
3656 * Restart interrupted system call.
3658 if (errno
== EINTR
) {
3666 for (i
= 0; i
< nb_fd
; i
++) {
3667 /* Fetch once the poll data */
3668 revents
= LTTNG_POLL_GETEV(&events
, i
);
3669 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3671 health_code_update();
3673 /* Thread quit pipe has been closed. Killing thread. */
3674 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3680 /* Event on the registration socket */
3681 if (pollfd
== client_sock
) {
3682 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3683 ERR("Client socket poll error");
3689 DBG("Wait for client response");
3691 health_code_update();
3693 sock
= lttcomm_accept_unix_sock(client_sock
);
3699 * Set the CLOEXEC flag. Return code is useless because either way, the
3702 (void) utils_set_fd_cloexec(sock
);
3704 /* Set socket option for credentials retrieval */
3705 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3710 /* Allocate context command to process the client request */
3711 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3712 if (cmd_ctx
== NULL
) {
3713 PERROR("zmalloc cmd_ctx");
3717 /* Allocate data buffer for reception */
3718 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3719 if (cmd_ctx
->lsm
== NULL
) {
3720 PERROR("zmalloc cmd_ctx->lsm");
3724 cmd_ctx
->llm
= NULL
;
3725 cmd_ctx
->session
= NULL
;
3727 health_code_update();
3730 * Data is received from the lttng client. The struct
3731 * lttcomm_session_msg (lsm) contains the command and data request of
3734 DBG("Receiving data from client ...");
3735 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3736 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3738 DBG("Nothing recv() from client... continuing");
3744 clean_command_ctx(&cmd_ctx
);
3748 health_code_update();
3750 // TODO: Validate cmd_ctx including sanity check for
3751 // security purpose.
3753 rcu_thread_online();
3755 * This function dispatch the work to the kernel or userspace tracer
3756 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3757 * informations for the client. The command context struct contains
3758 * everything this function may needs.
3760 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3761 rcu_thread_offline();
3769 * TODO: Inform client somehow of the fatal error. At
3770 * this point, ret < 0 means that a zmalloc failed
3771 * (ENOMEM). Error detected but still accept
3772 * command, unless a socket error has been
3775 clean_command_ctx(&cmd_ctx
);
3779 health_code_update();
3781 DBG("Sending response (size: %d, retcode: %s)",
3782 cmd_ctx
->lttng_msg_size
,
3783 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3784 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3786 ERR("Failed to send data back to client");
3789 /* End of transmission */
3796 clean_command_ctx(&cmd_ctx
);
3798 health_code_update();
3810 lttng_poll_clean(&events
);
3811 clean_command_ctx(&cmd_ctx
);
3816 unlink(client_unix_sock_path
);
3817 if (client_sock
>= 0) {
3818 ret
= close(client_sock
);
3826 ERR("Health error occurred in %s", __func__
);
3829 health_unregister();
3831 DBG("Client thread dying");
3833 rcu_unregister_thread();
3839 * usage function on stderr
3841 static void usage(void)
3843 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3844 fprintf(stderr
, " -h, --help Display this usage.\n");
3845 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3846 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3847 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3848 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3849 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3850 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3851 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3852 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3853 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3854 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3855 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3856 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3857 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3858 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3859 fprintf(stderr
, " -V, --version Show version number.\n");
3860 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3861 fprintf(stderr
, " -q, --quiet No output at all.\n");
3862 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3863 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3864 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3865 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3869 * daemon argument parsing
3871 static int parse_args(int argc
, char **argv
)
3875 static struct option long_options
[] = {
3876 { "client-sock", 1, 0, 'c' },
3877 { "apps-sock", 1, 0, 'a' },
3878 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3879 { "kconsumerd-err-sock", 1, 0, 'E' },
3880 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3881 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3882 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3883 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3884 { "consumerd32-path", 1, 0, 'u' },
3885 { "consumerd32-libdir", 1, 0, 'U' },
3886 { "consumerd64-path", 1, 0, 't' },
3887 { "consumerd64-libdir", 1, 0, 'T' },
3888 { "daemonize", 0, 0, 'd' },
3889 { "sig-parent", 0, 0, 'S' },
3890 { "help", 0, 0, 'h' },
3891 { "group", 1, 0, 'g' },
3892 { "version", 0, 0, 'V' },
3893 { "quiet", 0, 0, 'q' },
3894 { "verbose", 0, 0, 'v' },
3895 { "verbose-consumer", 0, 0, 'Z' },
3896 { "no-kernel", 0, 0, 'N' },
3897 { "pidfile", 1, 0, 'p' },
3902 int option_index
= 0;
3903 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3904 long_options
, &option_index
);
3911 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3913 fprintf(stderr
, " with arg %s\n", optarg
);
3917 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3920 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3926 opt_tracing_group
= optarg
;
3932 fprintf(stdout
, "%s\n", VERSION
);
3938 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3941 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3944 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3947 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3950 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3953 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3959 lttng_opt_quiet
= 1;
3962 /* Verbose level can increase using multiple -v */
3963 lttng_opt_verbose
+= 1;
3966 opt_verbose_consumer
+= 1;
3969 consumerd32_bin
= optarg
;
3972 consumerd32_libdir
= optarg
;
3975 consumerd64_bin
= optarg
;
3978 consumerd64_libdir
= optarg
;
3981 opt_pidfile
= optarg
;
3984 /* Unknown option or other error.
3985 * Error is printed by getopt, just return */
3994 * Creates the two needed socket by the daemon.
3995 * apps_sock - The communication socket for all UST apps.
3996 * client_sock - The communication of the cli tool (lttng).
3998 static int init_daemon_socket(void)
4003 old_umask
= umask(0);
4005 /* Create client tool unix socket */
4006 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4007 if (client_sock
< 0) {
4008 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4013 /* Set the cloexec flag */
4014 ret
= utils_set_fd_cloexec(client_sock
);
4016 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4017 "Continuing but note that the consumer daemon will have a "
4018 "reference to this socket on exec()", client_sock
);
4021 /* File permission MUST be 660 */
4022 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4024 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4029 /* Create the application unix socket */
4030 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4031 if (apps_sock
< 0) {
4032 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4037 /* Set the cloexec flag */
4038 ret
= utils_set_fd_cloexec(apps_sock
);
4040 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4041 "Continuing but note that the consumer daemon will have a "
4042 "reference to this socket on exec()", apps_sock
);
4045 /* File permission MUST be 666 */
4046 ret
= chmod(apps_unix_sock_path
,
4047 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4049 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4054 DBG3("Session daemon client socket %d and application socket %d created",
4055 client_sock
, apps_sock
);
4063 * Check if the global socket is available, and if a daemon is answering at the
4064 * other side. If yes, error is returned.
4066 static int check_existing_daemon(void)
4068 /* Is there anybody out there ? */
4069 if (lttng_session_daemon_alive()) {
4077 * Set the tracing group gid onto the client socket.
4079 * Race window between mkdir and chown is OK because we are going from more
4080 * permissive (root.root) to less permissive (root.tracing).
4082 static int set_permissions(char *rundir
)
4087 ret
= allowed_group();
4089 WARN("No tracing group detected");
4090 /* Setting gid to 0 if no tracing group is found */
4096 /* Set lttng run dir */
4097 ret
= chown(rundir
, 0, gid
);
4099 ERR("Unable to set group on %s", rundir
);
4103 /* Ensure all applications and tracing group can search the run dir */
4104 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4106 ERR("Unable to set permissions on %s", rundir
);
4110 /* lttng client socket path */
4111 ret
= chown(client_unix_sock_path
, 0, gid
);
4113 ERR("Unable to set group on %s", client_unix_sock_path
);
4117 /* kconsumer error socket path */
4118 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4120 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4124 /* 64-bit ustconsumer error socket path */
4125 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4127 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4131 /* 32-bit ustconsumer compat32 error socket path */
4132 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4134 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4138 DBG("All permissions are set");
4144 * Create the lttng run directory needed for all global sockets and pipe.
4146 static int create_lttng_rundir(const char *rundir
)
4150 DBG3("Creating LTTng run directory: %s", rundir
);
4152 ret
= mkdir(rundir
, S_IRWXU
);
4154 if (errno
!= EEXIST
) {
4155 ERR("Unable to create %s", rundir
);
4167 * Setup sockets and directory needed by the kconsumerd communication with the
4170 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4174 char path
[PATH_MAX
];
4176 switch (consumer_data
->type
) {
4177 case LTTNG_CONSUMER_KERNEL
:
4178 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4180 case LTTNG_CONSUMER64_UST
:
4181 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4183 case LTTNG_CONSUMER32_UST
:
4184 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4187 ERR("Consumer type unknown");
4192 DBG2("Creating consumer directory: %s", path
);
4194 ret
= mkdir(path
, S_IRWXU
);
4196 if (errno
!= EEXIST
) {
4198 ERR("Failed to create %s", path
);
4204 /* Create the kconsumerd error unix socket */
4205 consumer_data
->err_sock
=
4206 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4207 if (consumer_data
->err_sock
< 0) {
4208 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4214 * Set the CLOEXEC flag. Return code is useless because either way, the
4217 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
4219 PERROR("utils_set_fd_cloexec");
4220 /* continue anyway */
4223 /* File permission MUST be 660 */
4224 ret
= chmod(consumer_data
->err_unix_sock_path
,
4225 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4227 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4237 * Signal handler for the daemon
4239 * Simply stop all worker threads, leaving main() return gracefully after
4240 * joining all threads and calling cleanup().
4242 static void sighandler(int sig
)
4246 DBG("SIGPIPE caught");
4249 DBG("SIGINT caught");
4253 DBG("SIGTERM caught");
4262 * Setup signal handler for :
4263 * SIGINT, SIGTERM, SIGPIPE
4265 static int set_signal_handler(void)
4268 struct sigaction sa
;
4271 if ((ret
= sigemptyset(&sigset
)) < 0) {
4272 PERROR("sigemptyset");
4276 sa
.sa_handler
= sighandler
;
4277 sa
.sa_mask
= sigset
;
4279 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4280 PERROR("sigaction");
4284 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4285 PERROR("sigaction");
4289 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4290 PERROR("sigaction");
4294 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4300 * Set open files limit to unlimited. This daemon can open a large number of
4301 * file descriptors in order to consumer multiple kernel traces.
4303 static void set_ulimit(void)
4308 /* The kernel does not allowed an infinite limit for open files */
4309 lim
.rlim_cur
= 65535;
4310 lim
.rlim_max
= 65535;
4312 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4314 PERROR("failed to set open files limit");
4319 * Write pidfile using the rundir and opt_pidfile.
4321 static void write_pidfile(void)
4324 char pidfile_path
[PATH_MAX
];
4329 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
4331 /* Build pidfile path from rundir and opt_pidfile. */
4332 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
4333 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
4335 PERROR("snprintf pidfile path");
4341 * Create pid file in rundir. Return value is of no importance. The
4342 * execution will continue even though we are not able to write the file.
4344 (void) utils_create_pid_file(getpid(), pidfile_path
);
4353 int main(int argc
, char **argv
)
4357 const char *home_path
, *env_app_timeout
;
4359 init_kernel_workarounds();
4361 rcu_register_thread();
4363 setup_consumerd_path();
4365 page_size
= sysconf(_SC_PAGESIZE
);
4366 if (page_size
< 0) {
4367 PERROR("sysconf _SC_PAGESIZE");
4368 page_size
= LONG_MAX
;
4369 WARN("Fallback page size to %ld", page_size
);
4372 /* Parse arguments */
4374 if ((ret
= parse_args(argc
, argv
)) < 0) {
4384 * child: setsid, close FD 0, 1, 2, chdir /
4385 * parent: exit (if fork is successful)
4393 * We are in the child. Make sure all other file
4394 * descriptors are closed, in case we are called with
4395 * more opened file descriptors than the standard ones.
4397 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
4402 /* Create thread quit pipe */
4403 if ((ret
= init_thread_quit_pipe()) < 0) {
4407 /* Check if daemon is UID = 0 */
4408 is_root
= !getuid();
4411 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4413 /* Create global run dir with root access */
4414 ret
= create_lttng_rundir(rundir
);
4419 if (strlen(apps_unix_sock_path
) == 0) {
4420 snprintf(apps_unix_sock_path
, PATH_MAX
,
4421 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4424 if (strlen(client_unix_sock_path
) == 0) {
4425 snprintf(client_unix_sock_path
, PATH_MAX
,
4426 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4429 /* Set global SHM for ust */
4430 if (strlen(wait_shm_path
) == 0) {
4431 snprintf(wait_shm_path
, PATH_MAX
,
4432 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4435 if (strlen(health_unix_sock_path
) == 0) {
4436 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4437 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
4440 /* Setup kernel consumerd path */
4441 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4442 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4443 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4444 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4446 DBG2("Kernel consumer err path: %s",
4447 kconsumer_data
.err_unix_sock_path
);
4448 DBG2("Kernel consumer cmd path: %s",
4449 kconsumer_data
.cmd_unix_sock_path
);
4451 home_path
= utils_get_home_dir();
4452 if (home_path
== NULL
) {
4453 /* TODO: Add --socket PATH option */
4454 ERR("Can't get HOME directory for sockets creation.");
4460 * Create rundir from home path. This will create something like
4463 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4469 ret
= create_lttng_rundir(rundir
);
4474 if (strlen(apps_unix_sock_path
) == 0) {
4475 snprintf(apps_unix_sock_path
, PATH_MAX
,
4476 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4479 /* Set the cli tool unix socket path */
4480 if (strlen(client_unix_sock_path
) == 0) {
4481 snprintf(client_unix_sock_path
, PATH_MAX
,
4482 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4485 /* Set global SHM for ust */
4486 if (strlen(wait_shm_path
) == 0) {
4487 snprintf(wait_shm_path
, PATH_MAX
,
4488 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
4491 /* Set health check Unix path */
4492 if (strlen(health_unix_sock_path
) == 0) {
4493 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4494 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4498 /* Set consumer initial state */
4499 kernel_consumerd_state
= CONSUMER_STOPPED
;
4500 ust_consumerd_state
= CONSUMER_STOPPED
;
4502 DBG("Client socket path %s", client_unix_sock_path
);
4503 DBG("Application socket path %s", apps_unix_sock_path
);
4504 DBG("Application wait path %s", wait_shm_path
);
4505 DBG("LTTng run directory path: %s", rundir
);
4507 /* 32 bits consumerd path setup */
4508 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4509 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4510 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4511 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4513 DBG2("UST consumer 32 bits err path: %s",
4514 ustconsumer32_data
.err_unix_sock_path
);
4515 DBG2("UST consumer 32 bits cmd path: %s",
4516 ustconsumer32_data
.cmd_unix_sock_path
);
4518 /* 64 bits consumerd path setup */
4519 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4520 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4521 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4522 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4524 DBG2("UST consumer 64 bits err path: %s",
4525 ustconsumer64_data
.err_unix_sock_path
);
4526 DBG2("UST consumer 64 bits cmd path: %s",
4527 ustconsumer64_data
.cmd_unix_sock_path
);
4530 * See if daemon already exist.
4532 if ((ret
= check_existing_daemon()) < 0) {
4533 ERR("Already running daemon.\n");
4535 * We do not goto exit because we must not cleanup()
4536 * because a daemon is already running.
4542 * Init UST app hash table. Alloc hash table before this point since
4543 * cleanup() can get called after that point.
4547 /* After this point, we can safely call cleanup() with "goto exit" */
4550 * These actions must be executed as root. We do that *after* setting up
4551 * the sockets path because we MUST make the check for another daemon using
4552 * those paths *before* trying to set the kernel consumer sockets and init
4556 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4561 /* Setup kernel tracer */
4562 if (!opt_no_kernel
) {
4563 init_kernel_tracer();
4566 /* Set ulimit for open files */
4569 /* init lttng_fd tracking must be done after set_ulimit. */
4572 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4577 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4582 if ((ret
= set_signal_handler()) < 0) {
4586 /* Setup the needed unix socket */
4587 if ((ret
= init_daemon_socket()) < 0) {
4591 /* Set credentials to socket */
4592 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4596 /* Get parent pid if -S, --sig-parent is specified. */
4597 if (opt_sig_parent
) {
4601 /* Setup the kernel pipe for waking up the kernel thread */
4602 if (is_root
&& !opt_no_kernel
) {
4603 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4608 /* Setup the thread ht_cleanup communication pipe. */
4609 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
4613 /* Setup the thread apps communication pipe. */
4614 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4618 /* Setup the thread apps notify communication pipe. */
4619 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
4623 /* Initialize global buffer per UID and PID registry. */
4624 buffer_reg_init_uid_registry();
4625 buffer_reg_init_pid_registry();
4627 /* Init UST command queue. */
4628 cds_wfq_init(&ust_cmd_queue
.queue
);
4631 * Get session list pointer. This pointer MUST NOT be free(). This list is
4632 * statically declared in session.c
4634 session_list_ptr
= session_get_list();
4636 /* Set up max poll set size */
4637 lttng_poll_set_max_size();
4641 /* Check for the application socket timeout env variable. */
4642 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4643 if (env_app_timeout
) {
4644 app_socket_timeout
= atoi(env_app_timeout
);
4646 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4651 /* Initialize communication library */
4654 /* Create thread to manage the client socket */
4655 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
4656 thread_ht_cleanup
, (void *) NULL
);
4658 PERROR("pthread_create ht_cleanup");
4659 goto exit_ht_cleanup
;
4662 /* Create thread to manage the client socket */
4663 ret
= pthread_create(&health_thread
, NULL
,
4664 thread_manage_health
, (void *) NULL
);
4666 PERROR("pthread_create health");
4670 /* Create thread to manage the client socket */
4671 ret
= pthread_create(&client_thread
, NULL
,
4672 thread_manage_clients
, (void *) NULL
);
4674 PERROR("pthread_create clients");
4678 /* Create thread to dispatch registration */
4679 ret
= pthread_create(&dispatch_thread
, NULL
,
4680 thread_dispatch_ust_registration
, (void *) NULL
);
4682 PERROR("pthread_create dispatch");
4686 /* Create thread to manage application registration. */
4687 ret
= pthread_create(®_apps_thread
, NULL
,
4688 thread_registration_apps
, (void *) NULL
);
4690 PERROR("pthread_create registration");
4694 /* Create thread to manage application socket */
4695 ret
= pthread_create(&apps_thread
, NULL
,
4696 thread_manage_apps
, (void *) NULL
);
4698 PERROR("pthread_create apps");
4702 /* Create thread to manage application notify socket */
4703 ret
= pthread_create(&apps_notify_thread
, NULL
,
4704 ust_thread_manage_notify
, (void *) NULL
);
4706 PERROR("pthread_create apps");
4710 /* Don't start this thread if kernel tracing is not requested nor root */
4711 if (is_root
&& !opt_no_kernel
) {
4712 /* Create kernel thread to manage kernel event */
4713 ret
= pthread_create(&kernel_thread
, NULL
,
4714 thread_manage_kernel
, (void *) NULL
);
4716 PERROR("pthread_create kernel");
4720 ret
= pthread_join(kernel_thread
, &status
);
4722 PERROR("pthread_join");
4723 goto error
; /* join error, exit without cleanup */
4728 ret
= pthread_join(apps_thread
, &status
);
4730 PERROR("pthread_join");
4731 goto error
; /* join error, exit without cleanup */
4735 ret
= pthread_join(reg_apps_thread
, &status
);
4737 PERROR("pthread_join");
4738 goto error
; /* join error, exit without cleanup */
4742 ret
= pthread_join(dispatch_thread
, &status
);
4744 PERROR("pthread_join");
4745 goto error
; /* join error, exit without cleanup */
4749 ret
= pthread_join(client_thread
, &status
);
4751 PERROR("pthread_join");
4752 goto error
; /* join error, exit without cleanup */
4755 ret
= join_consumer_thread(&kconsumer_data
);
4757 PERROR("join_consumer");
4758 goto error
; /* join error, exit without cleanup */
4761 ret
= join_consumer_thread(&ustconsumer32_data
);
4763 PERROR("join_consumer ust32");
4764 goto error
; /* join error, exit without cleanup */
4767 ret
= join_consumer_thread(&ustconsumer64_data
);
4769 PERROR("join_consumer ust64");
4770 goto error
; /* join error, exit without cleanup */
4774 ret
= pthread_join(health_thread
, &status
);
4776 PERROR("pthread_join health thread");
4777 goto error
; /* join error, exit without cleanup */
4781 ret
= pthread_join(ht_cleanup_thread
, &status
);
4783 PERROR("pthread_join ht cleanup thread");
4784 goto error
; /* join error, exit without cleanup */
4789 * cleanup() is called when no other thread is running.
4791 rcu_thread_online();
4793 rcu_thread_offline();
4794 rcu_unregister_thread();