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.
24 #include <semaphore.h>
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/poll.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/futex.h>
46 #include <common/relayd/relayd.h>
47 #include <common/utils.h>
49 #include "lttng-sessiond.h"
56 #include "kernel-consumer.h"
60 #include "ust-consumer.h"
66 #define CONSUMERD_FILE "lttng-consumerd"
69 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
70 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
71 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
72 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
75 const char *opt_tracing_group
;
76 static int opt_sig_parent
;
77 static int opt_verbose_consumer
;
78 static int opt_daemon
;
79 static int opt_no_kernel
;
80 static int is_root
; /* Set to 1 if the daemon is running as root */
81 static pid_t ppid
; /* Parent PID for --sig-parent option */
84 /* Consumer daemon specific control data */
85 static struct consumer_data kconsumer_data
= {
86 .type
= LTTNG_CONSUMER_KERNEL
,
87 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
88 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
91 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
92 .lock
= PTHREAD_MUTEX_INITIALIZER
,
94 static struct consumer_data ustconsumer64_data
= {
95 .type
= LTTNG_CONSUMER64_UST
,
96 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
97 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
100 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
101 .lock
= PTHREAD_MUTEX_INITIALIZER
,
103 static struct consumer_data ustconsumer32_data
= {
104 .type
= LTTNG_CONSUMER32_UST
,
105 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
106 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
109 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
110 .lock
= PTHREAD_MUTEX_INITIALIZER
,
113 /* Shared between threads */
114 static int dispatch_thread_exit
;
116 /* Global application Unix socket path */
117 static char apps_unix_sock_path
[PATH_MAX
];
118 /* Global client Unix socket path */
119 static char client_unix_sock_path
[PATH_MAX
];
120 /* global wait shm path for UST */
121 static char wait_shm_path
[PATH_MAX
];
122 /* Global health check unix path */
123 static char health_unix_sock_path
[PATH_MAX
];
125 /* Sockets and FDs */
126 static int client_sock
= -1;
127 static int apps_sock
= -1;
128 int kernel_tracer_fd
= -1;
129 static int kernel_poll_pipe
[2] = { -1, -1 };
132 * Quit pipe for all threads. This permits a single cancellation point
133 * for all threads when receiving an event on the pipe.
135 static int thread_quit_pipe
[2] = { -1, -1 };
138 * This pipe is used to inform the thread managing application communication
139 * that a command is queued and ready to be processed.
141 static int apps_cmd_pipe
[2] = { -1, -1 };
143 /* Pthread, Mutexes and Semaphores */
144 static pthread_t apps_thread
;
145 static pthread_t reg_apps_thread
;
146 static pthread_t client_thread
;
147 static pthread_t kernel_thread
;
148 static pthread_t dispatch_thread
;
149 static pthread_t health_thread
;
152 * UST registration command queue. This queue is tied with a futex and uses a N
153 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 * The thread_manage_apps and thread_dispatch_ust_registration interact with
156 * this queue and the wait/wake scheme.
158 static struct ust_cmd_queue ust_cmd_queue
;
161 * Pointer initialized before thread creation.
163 * This points to the tracing session list containing the session count and a
164 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
165 * MUST NOT be taken if you call a public function in session.c.
167 * The lock is nested inside the structure: session_list_ptr->lock. Please use
168 * session_lock_list and session_unlock_list for lock acquisition.
170 static struct ltt_session_list
*session_list_ptr
;
172 int ust_consumerd64_fd
= -1;
173 int ust_consumerd32_fd
= -1;
175 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
176 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
177 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
178 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
180 static const char *module_proc_lttng
= "/proc/lttng";
183 * Consumer daemon state which is changed when spawning it, killing it or in
184 * case of a fatal error.
186 enum consumerd_state
{
187 CONSUMER_STARTED
= 1,
188 CONSUMER_STOPPED
= 2,
193 * This consumer daemon state is used to validate if a client command will be
194 * able to reach the consumer. If not, the client is informed. For instance,
195 * doing a "lttng start" when the consumer state is set to ERROR will return an
196 * error to the client.
198 * The following example shows a possible race condition of this scheme:
200 * consumer thread error happens
202 * client cmd checks state -> still OK
203 * consumer thread exit, sets error
204 * client cmd try to talk to consumer
207 * However, since the consumer is a different daemon, we have no way of making
208 * sure the command will reach it safely even with this state flag. This is why
209 * we consider that up to the state validation during command processing, the
210 * command is safe. After that, we can not guarantee the correctness of the
211 * client request vis-a-vis the consumer.
213 static enum consumerd_state ust_consumerd_state
;
214 static enum consumerd_state kernel_consumerd_state
;
216 /* Used for the health monitoring of the session daemon. See health.h */
217 struct health_state health_thread_cmd
;
218 struct health_state health_thread_app_manage
;
219 struct health_state health_thread_app_reg
;
220 struct health_state health_thread_kernel
;
223 void setup_consumerd_path(void)
225 const char *bin
, *libdir
;
228 * Allow INSTALL_BIN_PATH to be used as a target path for the
229 * native architecture size consumer if CONFIG_CONSUMER*_PATH
230 * has not been defined.
232 #if (CAA_BITS_PER_LONG == 32)
233 if (!consumerd32_bin
[0]) {
234 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
236 if (!consumerd32_libdir
[0]) {
237 consumerd32_libdir
= INSTALL_LIB_PATH
;
239 #elif (CAA_BITS_PER_LONG == 64)
240 if (!consumerd64_bin
[0]) {
241 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
243 if (!consumerd64_libdir
[0]) {
244 consumerd64_libdir
= INSTALL_LIB_PATH
;
247 #error "Unknown bitness"
251 * runtime env. var. overrides the build default.
253 bin
= getenv("LTTNG_CONSUMERD32_BIN");
255 consumerd32_bin
= bin
;
257 bin
= getenv("LTTNG_CONSUMERD64_BIN");
259 consumerd64_bin
= bin
;
261 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
263 consumerd32_libdir
= libdir
;
265 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
267 consumerd64_libdir
= libdir
;
272 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
274 static int create_thread_poll_set(struct lttng_poll_event
*events
,
279 if (events
== NULL
|| size
== 0) {
284 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
290 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
302 * Check if the thread quit pipe was triggered.
304 * Return 1 if it was triggered else 0;
306 static int check_thread_quit_pipe(int fd
, uint32_t events
)
308 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
316 * Return group ID of the tracing group or -1 if not found.
318 static gid_t
allowed_group(void)
322 if (opt_tracing_group
) {
323 grp
= getgrnam(opt_tracing_group
);
325 grp
= getgrnam(default_tracing_group
);
335 * Init thread quit pipe.
337 * Return -1 on error or 0 if all pipes are created.
339 static int init_thread_quit_pipe(void)
343 ret
= pipe(thread_quit_pipe
);
345 PERROR("thread quit pipe");
349 for (i
= 0; i
< 2; i
++) {
350 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
362 * Stop all threads by closing the thread quit pipe.
364 static void stop_threads(void)
368 /* Stopping all threads */
369 DBG("Terminating all threads");
370 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
372 ERR("write error on thread quit pipe");
375 /* Dispatch thread */
376 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
377 futex_nto1_wake(&ust_cmd_queue
.futex
);
383 static void cleanup(void)
387 struct ltt_session
*sess
, *stmp
;
391 /* First thing first, stop all threads */
392 utils_close_pipe(thread_quit_pipe
);
394 DBG("Removing %s directory", rundir
);
395 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
397 ERR("asprintf failed. Something is really wrong!");
400 /* Remove lttng run directory */
403 ERR("Unable to clean %s", rundir
);
407 DBG("Cleaning up all sessions");
409 /* Destroy session list mutex */
410 if (session_list_ptr
!= NULL
) {
411 pthread_mutex_destroy(&session_list_ptr
->lock
);
413 /* Cleanup ALL session */
414 cds_list_for_each_entry_safe(sess
, stmp
,
415 &session_list_ptr
->head
, list
) {
416 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
420 DBG("Closing all UST sockets");
421 ust_app_clean_list();
423 if (is_root
&& !opt_no_kernel
) {
424 DBG2("Closing kernel fd");
425 if (kernel_tracer_fd
>= 0) {
426 ret
= close(kernel_tracer_fd
);
431 DBG("Unloading kernel modules");
432 modprobe_remove_lttng_all();
435 utils_close_pipe(kernel_poll_pipe
);
436 utils_close_pipe(apps_cmd_pipe
);
439 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
440 "Matthew, BEET driven development works!%c[%dm",
441 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
446 * Send data on a unix socket using the liblttsessiondcomm API.
448 * Return lttcomm error code.
450 static int send_unix_sock(int sock
, void *buf
, size_t len
)
452 /* Check valid length */
457 return lttcomm_send_unix_sock(sock
, buf
, len
);
461 * Free memory of a command context structure.
463 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
465 DBG("Clean command context structure");
467 if ((*cmd_ctx
)->llm
) {
468 free((*cmd_ctx
)->llm
);
470 if ((*cmd_ctx
)->lsm
) {
471 free((*cmd_ctx
)->lsm
);
479 * Notify UST applications using the shm mmap futex.
481 static int notify_ust_apps(int active
)
485 DBG("Notifying applications of session daemon state: %d", active
);
487 /* See shm.c for this call implying mmap, shm and futex calls */
488 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
489 if (wait_shm_mmap
== NULL
) {
493 /* Wake waiting process */
494 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
496 /* Apps notified successfully */
504 * Setup the outgoing data buffer for the response (llm) by allocating the
505 * right amount of memory and copying the original information from the lsm
508 * Return total size of the buffer pointed by buf.
510 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
516 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
517 if (cmd_ctx
->llm
== NULL
) {
523 /* Copy common data */
524 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
525 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
527 cmd_ctx
->llm
->data_size
= size
;
528 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
537 * Update the kernel poll set of all channel fd available over all tracing
538 * session. Add the wakeup pipe at the end of the set.
540 static int update_kernel_poll(struct lttng_poll_event
*events
)
543 struct ltt_session
*session
;
544 struct ltt_kernel_channel
*channel
;
546 DBG("Updating kernel poll set");
549 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
550 session_lock(session
);
551 if (session
->kernel_session
== NULL
) {
552 session_unlock(session
);
556 cds_list_for_each_entry(channel
,
557 &session
->kernel_session
->channel_list
.head
, list
) {
558 /* Add channel fd to the kernel poll set */
559 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
561 session_unlock(session
);
564 DBG("Channel fd %d added to kernel set", channel
->fd
);
566 session_unlock(session
);
568 session_unlock_list();
573 session_unlock_list();
578 * Find the channel fd from 'fd' over all tracing session. When found, check
579 * for new channel stream and send those stream fds to the kernel consumer.
581 * Useful for CPU hotplug feature.
583 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
586 struct ltt_session
*session
;
587 struct ltt_kernel_session
*ksess
;
588 struct ltt_kernel_channel
*channel
;
590 DBG("Updating kernel streams for channel fd %d", fd
);
593 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
594 session_lock(session
);
595 if (session
->kernel_session
== NULL
) {
596 session_unlock(session
);
599 ksess
= session
->kernel_session
;
601 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
602 if (channel
->fd
== fd
) {
603 DBG("Channel found, updating kernel streams");
604 ret
= kernel_open_channel_stream(channel
);
610 * Have we already sent fds to the consumer? If yes, it means
611 * that tracing is started so it is safe to send our updated
614 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
615 struct lttng_ht_iter iter
;
616 struct consumer_socket
*socket
;
619 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
620 &iter
.iter
, socket
, node
.node
) {
621 /* Code flow error */
622 assert(socket
->fd
>= 0);
624 pthread_mutex_lock(socket
->lock
);
625 ret
= kernel_consumer_send_channel_stream(socket
->fd
,
627 pthread_mutex_unlock(socket
->lock
);
636 session_unlock(session
);
638 session_unlock_list();
642 session_unlock(session
);
643 session_unlock_list();
648 * For each tracing session, update newly registered apps.
650 static void update_ust_app(int app_sock
)
652 struct ltt_session
*sess
, *stmp
;
656 /* For all tracing session(s) */
657 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
659 if (sess
->ust_session
) {
660 ust_app_global_update(sess
->ust_session
, app_sock
);
662 session_unlock(sess
);
665 session_unlock_list();
669 * This thread manage event coming from the kernel.
671 * Features supported in this thread:
674 static void *thread_manage_kernel(void *data
)
676 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
677 uint32_t revents
, nb_fd
;
679 struct lttng_poll_event events
;
681 DBG("Thread manage kernel started");
683 health_code_update(&health_thread_kernel
);
685 ret
= create_thread_poll_set(&events
, 2);
687 goto error_poll_create
;
690 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
696 health_code_update(&health_thread_kernel
);
698 if (update_poll_flag
== 1) {
700 * Reset number of fd in the poll set. Always 2 since there is the thread
701 * quit pipe and the kernel pipe.
705 ret
= update_kernel_poll(&events
);
709 update_poll_flag
= 0;
712 nb_fd
= LTTNG_POLL_GETNB(&events
);
714 DBG("Thread kernel polling on %d fds", nb_fd
);
716 /* Zeroed the poll events */
717 lttng_poll_reset(&events
);
719 /* Poll infinite value of time */
721 health_poll_update(&health_thread_kernel
);
722 ret
= lttng_poll_wait(&events
, -1);
723 health_poll_update(&health_thread_kernel
);
726 * Restart interrupted system call.
728 if (errno
== EINTR
) {
732 } else if (ret
== 0) {
733 /* Should not happen since timeout is infinite */
734 ERR("Return value of poll is 0 with an infinite timeout.\n"
735 "This should not have happened! Continuing...");
739 for (i
= 0; i
< nb_fd
; i
++) {
740 /* Fetch once the poll data */
741 revents
= LTTNG_POLL_GETEV(&events
, i
);
742 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
744 health_code_update(&health_thread_kernel
);
746 /* Thread quit pipe has been closed. Killing thread. */
747 ret
= check_thread_quit_pipe(pollfd
, revents
);
753 /* Check for data on kernel pipe */
754 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
755 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
756 update_poll_flag
= 1;
760 * New CPU detected by the kernel. Adding kernel stream to
761 * kernel session and updating the kernel consumer
763 if (revents
& LPOLLIN
) {
764 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
770 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
771 * and unregister kernel stream at this point.
780 lttng_poll_clean(&events
);
783 health_error(&health_thread_kernel
);
784 ERR("Health error occurred in %s", __func__
);
786 health_exit(&health_thread_kernel
);
787 DBG("Kernel thread dying");
792 * This thread manage the consumer error sent back to the session daemon.
794 static void *thread_manage_consumer(void *data
)
796 int sock
= -1, i
, ret
, pollfd
, err
= -1;
797 uint32_t revents
, nb_fd
;
798 enum lttcomm_return_code code
;
799 struct lttng_poll_event events
;
800 struct consumer_data
*consumer_data
= data
;
802 DBG("[thread] Manage consumer started");
804 health_code_update(&consumer_data
->health
);
806 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
812 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
813 * Nothing more will be added to this poll set.
815 ret
= create_thread_poll_set(&events
, 2);
820 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
825 nb_fd
= LTTNG_POLL_GETNB(&events
);
827 health_code_update(&consumer_data
->health
);
829 /* Inifinite blocking call, waiting for transmission */
831 health_poll_update(&consumer_data
->health
);
832 ret
= lttng_poll_wait(&events
, -1);
833 health_poll_update(&consumer_data
->health
);
836 * Restart interrupted system call.
838 if (errno
== EINTR
) {
844 for (i
= 0; i
< nb_fd
; i
++) {
845 /* Fetch once the poll data */
846 revents
= LTTNG_POLL_GETEV(&events
, i
);
847 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
849 health_code_update(&consumer_data
->health
);
851 /* Thread quit pipe has been closed. Killing thread. */
852 ret
= check_thread_quit_pipe(pollfd
, revents
);
858 /* Event on the registration socket */
859 if (pollfd
== consumer_data
->err_sock
) {
860 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
861 ERR("consumer err socket poll error");
867 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
872 health_code_update(&consumer_data
->health
);
874 DBG2("Receiving code from consumer err_sock");
876 /* Getting status code from kconsumerd */
877 ret
= lttcomm_recv_unix_sock(sock
, &code
,
878 sizeof(enum lttcomm_return_code
));
883 health_code_update(&consumer_data
->health
);
885 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
886 consumer_data
->cmd_sock
=
887 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
888 if (consumer_data
->cmd_sock
< 0) {
889 sem_post(&consumer_data
->sem
);
890 PERROR("consumer connect");
893 /* Signal condition to tell that the kconsumerd is ready */
894 sem_post(&consumer_data
->sem
);
895 DBG("consumer command socket ready");
897 ERR("consumer error when waiting for SOCK_READY : %s",
898 lttcomm_get_readable_code(-code
));
902 /* Remove the kconsumerd error sock since we've established a connexion */
903 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
908 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
913 health_code_update(&consumer_data
->health
);
915 /* Update number of fd */
916 nb_fd
= LTTNG_POLL_GETNB(&events
);
918 /* Inifinite blocking call, waiting for transmission */
920 health_poll_update(&consumer_data
->health
);
921 ret
= lttng_poll_wait(&events
, -1);
922 health_poll_update(&consumer_data
->health
);
925 * Restart interrupted system call.
927 if (errno
== EINTR
) {
933 for (i
= 0; i
< nb_fd
; i
++) {
934 /* Fetch once the poll data */
935 revents
= LTTNG_POLL_GETEV(&events
, i
);
936 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
938 health_code_update(&consumer_data
->health
);
940 /* Thread quit pipe has been closed. Killing thread. */
941 ret
= check_thread_quit_pipe(pollfd
, revents
);
947 /* Event on the kconsumerd socket */
948 if (pollfd
== sock
) {
949 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
950 ERR("consumer err socket second poll error");
956 health_code_update(&consumer_data
->health
);
958 /* Wait for any kconsumerd error */
959 ret
= lttcomm_recv_unix_sock(sock
, &code
,
960 sizeof(enum lttcomm_return_code
));
962 ERR("consumer closed the command socket");
966 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
970 /* Immediately set the consumerd state to stopped */
971 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
972 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
973 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
974 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
975 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
977 /* Code flow error... */
981 if (consumer_data
->err_sock
>= 0) {
982 ret
= close(consumer_data
->err_sock
);
987 if (consumer_data
->cmd_sock
>= 0) {
988 ret
= close(consumer_data
->cmd_sock
);
1000 unlink(consumer_data
->err_unix_sock_path
);
1001 unlink(consumer_data
->cmd_unix_sock_path
);
1002 consumer_data
->pid
= 0;
1004 lttng_poll_clean(&events
);
1008 health_error(&consumer_data
->health
);
1009 ERR("Health error occurred in %s", __func__
);
1011 health_exit(&consumer_data
->health
);
1012 DBG("consumer thread cleanup completed");
1018 * This thread manage application communication.
1020 static void *thread_manage_apps(void *data
)
1022 int i
, ret
, pollfd
, err
= -1;
1023 uint32_t revents
, nb_fd
;
1024 struct ust_command ust_cmd
;
1025 struct lttng_poll_event events
;
1027 DBG("[thread] Manage application started");
1029 rcu_register_thread();
1030 rcu_thread_online();
1032 health_code_update(&health_thread_app_manage
);
1034 ret
= create_thread_poll_set(&events
, 2);
1036 goto error_poll_create
;
1039 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1044 health_code_update(&health_thread_app_manage
);
1047 /* Zeroed the events structure */
1048 lttng_poll_reset(&events
);
1050 nb_fd
= LTTNG_POLL_GETNB(&events
);
1052 DBG("Apps thread polling on %d fds", nb_fd
);
1054 /* Inifinite blocking call, waiting for transmission */
1056 health_poll_update(&health_thread_app_manage
);
1057 ret
= lttng_poll_wait(&events
, -1);
1058 health_poll_update(&health_thread_app_manage
);
1061 * Restart interrupted system call.
1063 if (errno
== EINTR
) {
1069 for (i
= 0; i
< nb_fd
; i
++) {
1070 /* Fetch once the poll data */
1071 revents
= LTTNG_POLL_GETEV(&events
, i
);
1072 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1074 health_code_update(&health_thread_app_manage
);
1076 /* Thread quit pipe has been closed. Killing thread. */
1077 ret
= check_thread_quit_pipe(pollfd
, revents
);
1083 /* Inspect the apps cmd pipe */
1084 if (pollfd
== apps_cmd_pipe
[0]) {
1085 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1086 ERR("Apps command pipe error");
1088 } else if (revents
& LPOLLIN
) {
1090 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1091 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1092 PERROR("read apps cmd pipe");
1096 health_code_update(&health_thread_app_manage
);
1098 /* Register applicaton to the session daemon */
1099 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1101 if (ret
== -ENOMEM
) {
1103 } else if (ret
< 0) {
1107 health_code_update(&health_thread_app_manage
);
1110 * Validate UST version compatibility.
1112 ret
= ust_app_validate_version(ust_cmd
.sock
);
1115 * Add channel(s) and event(s) to newly registered apps
1116 * from lttng global UST domain.
1118 update_ust_app(ust_cmd
.sock
);
1121 health_code_update(&health_thread_app_manage
);
1123 ret
= ust_app_register_done(ust_cmd
.sock
);
1126 * If the registration is not possible, we simply
1127 * unregister the apps and continue
1129 ust_app_unregister(ust_cmd
.sock
);
1132 * We just need here to monitor the close of the UST
1133 * socket and poll set monitor those by default.
1134 * Listen on POLLIN (even if we never expect any
1135 * data) to ensure that hangup wakes us.
1137 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1142 DBG("Apps with sock %d added to poll set",
1146 health_code_update(&health_thread_app_manage
);
1152 * At this point, we know that a registered application made
1153 * the event at poll_wait.
1155 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1156 /* Removing from the poll set */
1157 ret
= lttng_poll_del(&events
, pollfd
);
1162 /* Socket closed on remote end. */
1163 ust_app_unregister(pollfd
);
1168 health_code_update(&health_thread_app_manage
);
1174 lttng_poll_clean(&events
);
1177 health_error(&health_thread_app_manage
);
1178 ERR("Health error occurred in %s", __func__
);
1180 health_exit(&health_thread_app_manage
);
1181 DBG("Application communication apps thread cleanup complete");
1182 rcu_thread_offline();
1183 rcu_unregister_thread();
1188 * Dispatch request from the registration threads to the application
1189 * communication thread.
1191 static void *thread_dispatch_ust_registration(void *data
)
1194 struct cds_wfq_node
*node
;
1195 struct ust_command
*ust_cmd
= NULL
;
1197 DBG("[thread] Dispatch UST command started");
1199 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1200 /* Atomically prepare the queue futex */
1201 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1204 /* Dequeue command for registration */
1205 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1207 DBG("Woken up but nothing in the UST command queue");
1208 /* Continue thread execution */
1212 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1214 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1215 " gid:%d sock:%d name:%s (version %d.%d)",
1216 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1217 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1218 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1219 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1221 * Inform apps thread of the new application registration. This
1222 * call is blocking so we can be assured that the data will be read
1223 * at some point in time or wait to the end of the world :)
1225 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1226 sizeof(struct ust_command
));
1228 PERROR("write apps cmd pipe");
1229 if (errno
== EBADF
) {
1231 * We can't inform the application thread to process
1232 * registration. We will exit or else application
1233 * registration will not occur and tracing will never
1240 } while (node
!= NULL
);
1242 /* Futex wait on queue. Blocking call on futex() */
1243 futex_nto1_wait(&ust_cmd_queue
.futex
);
1247 DBG("Dispatch thread dying");
1252 * This thread manage application registration.
1254 static void *thread_registration_apps(void *data
)
1256 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1257 uint32_t revents
, nb_fd
;
1258 struct lttng_poll_event events
;
1260 * Get allocated in this thread, enqueued to a global queue, dequeued and
1261 * freed in the manage apps thread.
1263 struct ust_command
*ust_cmd
= NULL
;
1265 DBG("[thread] Manage application registration started");
1267 ret
= lttcomm_listen_unix_sock(apps_sock
);
1273 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1274 * more will be added to this poll set.
1276 ret
= create_thread_poll_set(&events
, 2);
1278 goto error_create_poll
;
1281 /* Add the application registration socket */
1282 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1284 goto error_poll_add
;
1287 /* Notify all applications to register */
1288 ret
= notify_ust_apps(1);
1290 ERR("Failed to notify applications or create the wait shared memory.\n"
1291 "Execution continues but there might be problem for already\n"
1292 "running applications that wishes to register.");
1296 DBG("Accepting application registration");
1298 nb_fd
= LTTNG_POLL_GETNB(&events
);
1300 /* Inifinite blocking call, waiting for transmission */
1302 health_poll_update(&health_thread_app_reg
);
1303 ret
= lttng_poll_wait(&events
, -1);
1304 health_poll_update(&health_thread_app_reg
);
1307 * Restart interrupted system call.
1309 if (errno
== EINTR
) {
1315 for (i
= 0; i
< nb_fd
; i
++) {
1316 health_code_update(&health_thread_app_reg
);
1318 /* Fetch once the poll data */
1319 revents
= LTTNG_POLL_GETEV(&events
, i
);
1320 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1322 /* Thread quit pipe has been closed. Killing thread. */
1323 ret
= check_thread_quit_pipe(pollfd
, revents
);
1329 /* Event on the registration socket */
1330 if (pollfd
== apps_sock
) {
1331 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1332 ERR("Register apps socket poll error");
1334 } else if (revents
& LPOLLIN
) {
1335 sock
= lttcomm_accept_unix_sock(apps_sock
);
1340 /* Create UST registration command for enqueuing */
1341 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1342 if (ust_cmd
== NULL
) {
1343 PERROR("ust command zmalloc");
1348 * Using message-based transmissions to ensure we don't
1349 * have to deal with partially received messages.
1351 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1353 ERR("Exhausted file descriptors allowed for applications.");
1362 health_code_update(&health_thread_app_reg
);
1363 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1364 sizeof(struct ust_register_msg
));
1365 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1367 PERROR("lttcomm_recv_unix_sock register apps");
1369 ERR("Wrong size received on apps register");
1376 lttng_fd_put(LTTNG_FD_APPS
, 1);
1380 health_code_update(&health_thread_app_reg
);
1382 ust_cmd
->sock
= sock
;
1385 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1386 " gid:%d sock:%d name:%s (version %d.%d)",
1387 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1388 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1389 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1390 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1393 * Lock free enqueue the registration request. The red pill
1394 * has been taken! This apps will be part of the *system*.
1396 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1399 * Wake the registration queue futex. Implicit memory
1400 * barrier with the exchange in cds_wfq_enqueue.
1402 futex_nto1_wake(&ust_cmd_queue
.futex
);
1411 health_error(&health_thread_app_reg
);
1412 ERR("Health error occurred in %s", __func__
);
1414 health_exit(&health_thread_app_reg
);
1416 /* Notify that the registration thread is gone */
1419 if (apps_sock
>= 0) {
1420 ret
= close(apps_sock
);
1430 lttng_fd_put(LTTNG_FD_APPS
, 1);
1432 unlink(apps_unix_sock_path
);
1435 lttng_poll_clean(&events
);
1438 DBG("UST Registration thread cleanup complete");
1444 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1445 * exec or it will fails.
1447 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1450 struct timespec timeout
;
1452 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1453 timeout
.tv_nsec
= 0;
1455 /* Setup semaphore */
1456 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1458 PERROR("sem_init consumer semaphore");
1462 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1463 thread_manage_consumer
, consumer_data
);
1465 PERROR("pthread_create consumer");
1470 /* Get time for sem_timedwait absolute timeout */
1471 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1473 PERROR("clock_gettime spawn consumer");
1474 /* Infinite wait for the kconsumerd thread to be ready */
1475 ret
= sem_wait(&consumer_data
->sem
);
1477 /* Normal timeout if the gettime was successful */
1478 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1479 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1483 if (errno
== ETIMEDOUT
) {
1485 * Call has timed out so we kill the kconsumerd_thread and return
1488 ERR("The consumer thread was never ready. Killing it");
1489 ret
= pthread_cancel(consumer_data
->thread
);
1491 PERROR("pthread_cancel consumer thread");
1494 PERROR("semaphore wait failed consumer thread");
1499 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1500 if (consumer_data
->pid
== 0) {
1501 ERR("Kconsumerd did not start");
1502 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1505 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1514 * Join consumer thread
1516 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1521 /* Consumer pid must be a real one. */
1522 if (consumer_data
->pid
> 0) {
1523 ret
= kill(consumer_data
->pid
, SIGTERM
);
1525 ERR("Error killing consumer daemon");
1528 return pthread_join(consumer_data
->thread
, &status
);
1535 * Fork and exec a consumer daemon (consumerd).
1537 * Return pid if successful else -1.
1539 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1543 const char *consumer_to_use
;
1544 const char *verbosity
;
1547 DBG("Spawning consumerd");
1554 if (opt_verbose_consumer
) {
1555 verbosity
= "--verbose";
1557 verbosity
= "--quiet";
1559 switch (consumer_data
->type
) {
1560 case LTTNG_CONSUMER_KERNEL
:
1562 * Find out which consumerd to execute. We will first try the
1563 * 64-bit path, then the sessiond's installation directory, and
1564 * fallback on the 32-bit one,
1566 DBG3("Looking for a kernel consumer at these locations:");
1567 DBG3(" 1) %s", consumerd64_bin
);
1568 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1569 DBG3(" 3) %s", consumerd32_bin
);
1570 if (stat(consumerd64_bin
, &st
) == 0) {
1571 DBG3("Found location #1");
1572 consumer_to_use
= consumerd64_bin
;
1573 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1574 DBG3("Found location #2");
1575 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1576 } else if (stat(consumerd32_bin
, &st
) == 0) {
1577 DBG3("Found location #3");
1578 consumer_to_use
= consumerd32_bin
;
1580 DBG("Could not find any valid consumerd executable");
1583 DBG("Using kernel consumer at: %s", consumer_to_use
);
1584 execl(consumer_to_use
,
1585 "lttng-consumerd", verbosity
, "-k",
1586 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1587 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1590 case LTTNG_CONSUMER64_UST
:
1592 char *tmpnew
= NULL
;
1594 if (consumerd64_libdir
[0] != '\0') {
1598 tmp
= getenv("LD_LIBRARY_PATH");
1602 tmplen
= strlen("LD_LIBRARY_PATH=")
1603 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1604 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1609 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1610 strcat(tmpnew
, consumerd64_libdir
);
1611 if (tmp
[0] != '\0') {
1612 strcat(tmpnew
, ":");
1613 strcat(tmpnew
, tmp
);
1615 ret
= putenv(tmpnew
);
1621 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1622 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1623 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1624 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1626 if (consumerd64_libdir
[0] != '\0') {
1634 case LTTNG_CONSUMER32_UST
:
1636 char *tmpnew
= NULL
;
1638 if (consumerd32_libdir
[0] != '\0') {
1642 tmp
= getenv("LD_LIBRARY_PATH");
1646 tmplen
= strlen("LD_LIBRARY_PATH=")
1647 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1648 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1653 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1654 strcat(tmpnew
, consumerd32_libdir
);
1655 if (tmp
[0] != '\0') {
1656 strcat(tmpnew
, ":");
1657 strcat(tmpnew
, tmp
);
1659 ret
= putenv(tmpnew
);
1665 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1666 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1667 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1668 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1670 if (consumerd32_libdir
[0] != '\0') {
1679 PERROR("unknown consumer type");
1683 PERROR("kernel start consumer exec");
1686 } else if (pid
> 0) {
1689 PERROR("start consumer fork");
1697 * Spawn the consumerd daemon and session daemon thread.
1699 static int start_consumerd(struct consumer_data
*consumer_data
)
1703 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1704 if (consumer_data
->pid
!= 0) {
1705 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1709 ret
= spawn_consumerd(consumer_data
);
1711 ERR("Spawning consumerd failed");
1712 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1716 /* Setting up the consumer_data pid */
1717 consumer_data
->pid
= ret
;
1718 DBG2("Consumer pid %d", consumer_data
->pid
);
1719 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1721 DBG2("Spawning consumer control thread");
1722 ret
= spawn_consumer_thread(consumer_data
);
1724 ERR("Fatal error spawning consumer control thread");
1736 * Compute health status of each consumer. If one of them is zero (bad
1737 * state), we return 0.
1739 static int check_consumer_health(void)
1743 ret
= health_check_state(&kconsumer_data
.health
) &&
1744 health_check_state(&ustconsumer32_data
.health
) &&
1745 health_check_state(&ustconsumer64_data
.health
);
1747 DBG3("Health consumer check %d", ret
);
1753 * Setup necessary data for kernel tracer action.
1755 static int init_kernel_tracer(void)
1759 /* Modprobe lttng kernel modules */
1760 ret
= modprobe_lttng_control();
1765 /* Open debugfs lttng */
1766 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1767 if (kernel_tracer_fd
< 0) {
1768 DBG("Failed to open %s", module_proc_lttng
);
1773 /* Validate kernel version */
1774 ret
= kernel_validate_version(kernel_tracer_fd
);
1779 ret
= modprobe_lttng_data();
1784 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1788 modprobe_remove_lttng_control();
1789 ret
= close(kernel_tracer_fd
);
1793 kernel_tracer_fd
= -1;
1794 return LTTCOMM_KERN_VERSION
;
1797 ret
= close(kernel_tracer_fd
);
1803 modprobe_remove_lttng_control();
1806 WARN("No kernel tracer available");
1807 kernel_tracer_fd
= -1;
1809 return LTTCOMM_NEED_ROOT_SESSIOND
;
1811 return LTTCOMM_KERN_NA
;
1817 * Copy consumer output from the tracing session to the domain session. The
1818 * function also applies the right modification on a per domain basis for the
1819 * trace files destination directory.
1821 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
1824 const char *dir_name
;
1825 struct consumer_output
*consumer
;
1828 assert(session
->consumer
);
1831 case LTTNG_DOMAIN_KERNEL
:
1832 DBG3("Copying tracing session consumer output in kernel session");
1833 session
->kernel_session
->consumer
=
1834 consumer_copy_output(session
->consumer
);
1835 /* Ease our life a bit for the next part */
1836 consumer
= session
->kernel_session
->consumer
;
1837 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
1839 case LTTNG_DOMAIN_UST
:
1840 DBG3("Copying tracing session consumer output in UST session");
1841 session
->ust_session
->consumer
=
1842 consumer_copy_output(session
->consumer
);
1843 /* Ease our life a bit for the next part */
1844 consumer
= session
->ust_session
->consumer
;
1845 dir_name
= DEFAULT_UST_TRACE_DIR
;
1848 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1852 ret
= consumer_set_subdir(session
->consumer
, session
->name
);
1854 ret
= LTTCOMM_FATAL
;
1858 /* Append correct directory to subdir */
1859 strncat(consumer
->subdir
, dir_name
,
1860 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
1861 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
1870 * Create an UST session and add it to the session ust list.
1872 static int create_ust_session(struct ltt_session
*session
,
1873 struct lttng_domain
*domain
)
1876 struct ltt_ust_session
*lus
= NULL
;
1880 assert(session
->consumer
);
1882 switch (domain
->type
) {
1883 case LTTNG_DOMAIN_UST
:
1886 ERR("Unknown UST domain on create session %d", domain
->type
);
1887 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1891 DBG("Creating UST session");
1893 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1895 ret
= LTTCOMM_UST_SESS_FAIL
;
1899 lus
->uid
= session
->uid
;
1900 lus
->gid
= session
->gid
;
1901 session
->ust_session
= lus
;
1903 /* Copy session output to the newly created UST session */
1904 ret
= copy_session_consumer(domain
->type
, session
);
1905 if (ret
!= LTTCOMM_OK
) {
1913 session
->ust_session
= NULL
;
1918 * Create a kernel tracer session then create the default channel.
1920 static int create_kernel_session(struct ltt_session
*session
)
1924 DBG("Creating kernel session");
1926 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1928 ret
= LTTCOMM_KERN_SESS_FAIL
;
1932 /* Code flow safety */
1933 assert(session
->kernel_session
);
1935 /* Copy session output to the newly created Kernel session */
1936 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
1937 if (ret
!= LTTCOMM_OK
) {
1941 /* Create directory(ies) on local filesystem. */
1942 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
1943 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
1944 ret
= run_as_mkdir_recursive(
1945 session
->kernel_session
->consumer
->dst
.trace_path
,
1946 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
1948 if (ret
!= -EEXIST
) {
1949 ERR("Trace directory creation error");
1955 session
->kernel_session
->uid
= session
->uid
;
1956 session
->kernel_session
->gid
= session
->gid
;
1961 trace_kernel_destroy_session(session
->kernel_session
);
1962 session
->kernel_session
= NULL
;
1967 * Count number of session permitted by uid/gid.
1969 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
1972 struct ltt_session
*session
;
1974 DBG("Counting number of available session for UID %d GID %d",
1976 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1978 * Only list the sessions the user can control.
1980 if (!session_access_ok(session
, uid
, gid
)) {
1989 * Process the command requested by the lttng client within the command
1990 * context structure. This function make sure that the return structure (llm)
1991 * is set and ready for transmission before returning.
1993 * Return any error encountered or 0 for success.
1995 * "sock" is only used for special-case var. len data.
1997 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2000 int ret
= LTTCOMM_OK
;
2001 int need_tracing_session
= 1;
2004 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2008 switch (cmd_ctx
->lsm
->cmd_type
) {
2009 case LTTNG_CREATE_SESSION
:
2010 case LTTNG_DESTROY_SESSION
:
2011 case LTTNG_LIST_SESSIONS
:
2012 case LTTNG_LIST_DOMAINS
:
2013 case LTTNG_START_TRACE
:
2014 case LTTNG_STOP_TRACE
:
2021 if (opt_no_kernel
&& need_domain
2022 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2024 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
2026 ret
= LTTCOMM_KERN_NA
;
2031 /* Deny register consumer if we already have a spawned consumer. */
2032 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2033 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2034 if (kconsumer_data
.pid
> 0) {
2035 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2036 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2039 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2043 * Check for command that don't needs to allocate a returned payload. We do
2044 * this here so we don't have to make the call for no payload at each
2047 switch(cmd_ctx
->lsm
->cmd_type
) {
2048 case LTTNG_LIST_SESSIONS
:
2049 case LTTNG_LIST_TRACEPOINTS
:
2050 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2051 case LTTNG_LIST_DOMAINS
:
2052 case LTTNG_LIST_CHANNELS
:
2053 case LTTNG_LIST_EVENTS
:
2056 /* Setup lttng message with no payload */
2057 ret
= setup_lttng_msg(cmd_ctx
, 0);
2059 /* This label does not try to unlock the session */
2060 goto init_setup_error
;
2064 /* Commands that DO NOT need a session. */
2065 switch (cmd_ctx
->lsm
->cmd_type
) {
2066 case LTTNG_CREATE_SESSION
:
2067 case LTTNG_CALIBRATE
:
2068 case LTTNG_LIST_SESSIONS
:
2069 case LTTNG_LIST_TRACEPOINTS
:
2070 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2071 need_tracing_session
= 0;
2074 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2076 * We keep the session list lock across _all_ commands
2077 * for now, because the per-session lock does not
2078 * handle teardown properly.
2080 session_lock_list();
2081 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2082 if (cmd_ctx
->session
== NULL
) {
2083 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2084 ret
= LTTCOMM_SESS_NOT_FOUND
;
2086 /* If no session name specified */
2087 ret
= LTTCOMM_SELECT_SESS
;
2091 /* Acquire lock for the session */
2092 session_lock(cmd_ctx
->session
);
2102 * Check domain type for specific "pre-action".
2104 switch (cmd_ctx
->lsm
->domain
.type
) {
2105 case LTTNG_DOMAIN_KERNEL
:
2107 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
2111 /* Kernel tracer check */
2112 if (kernel_tracer_fd
== -1) {
2113 /* Basically, load kernel tracer modules */
2114 ret
= init_kernel_tracer();
2120 /* Consumer is in an ERROR state. Report back to client */
2121 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2122 ret
= LTTCOMM_NO_KERNCONSUMERD
;
2126 /* Need a session for kernel command */
2127 if (need_tracing_session
) {
2128 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2129 ret
= create_kernel_session(cmd_ctx
->session
);
2131 ret
= LTTCOMM_KERN_SESS_FAIL
;
2136 /* Start the kernel consumer daemon */
2137 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2138 if (kconsumer_data
.pid
== 0 &&
2139 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
&&
2140 cmd_ctx
->session
->start_consumer
) {
2141 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2142 ret
= start_consumerd(&kconsumer_data
);
2144 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2147 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2149 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2153 * The consumer was just spawned so we need to add the socket to
2154 * the consumer output of the session if exist.
2156 ret
= consumer_create_socket(&kconsumer_data
,
2157 cmd_ctx
->session
->kernel_session
->consumer
);
2164 case LTTNG_DOMAIN_UST
:
2166 /* Consumer is in an ERROR state. Report back to client */
2167 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2168 ret
= LTTCOMM_NO_USTCONSUMERD
;
2172 if (need_tracing_session
) {
2173 /* Create UST session if none exist. */
2174 if (cmd_ctx
->session
->ust_session
== NULL
) {
2175 ret
= create_ust_session(cmd_ctx
->session
,
2176 &cmd_ctx
->lsm
->domain
);
2177 if (ret
!= LTTCOMM_OK
) {
2182 /* Start the UST consumer daemons */
2184 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2185 if (consumerd64_bin
[0] != '\0' &&
2186 ustconsumer64_data
.pid
== 0 &&
2187 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
&&
2188 cmd_ctx
->session
->start_consumer
) {
2189 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2190 ret
= start_consumerd(&ustconsumer64_data
);
2192 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
2193 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2197 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2198 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2200 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2204 * Setup socket for consumer 64 bit. No need for atomic access
2205 * since it was set above and can ONLY be set in this thread.
2207 ret
= consumer_create_socket(&ustconsumer64_data
,
2208 cmd_ctx
->session
->ust_session
->consumer
);
2214 if (consumerd32_bin
[0] != '\0' &&
2215 ustconsumer32_data
.pid
== 0 &&
2216 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
&&
2217 cmd_ctx
->session
->start_consumer
) {
2218 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2219 ret
= start_consumerd(&ustconsumer32_data
);
2221 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
2222 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2226 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2227 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2229 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2233 * Setup socket for consumer 64 bit. No need for atomic access
2234 * since it was set above and can ONLY be set in this thread.
2236 ret
= consumer_create_socket(&ustconsumer32_data
,
2237 cmd_ctx
->session
->ust_session
->consumer
);
2249 /* Validate consumer daemon state when start/stop trace command */
2250 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2251 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2252 switch (cmd_ctx
->lsm
->domain
.type
) {
2253 case LTTNG_DOMAIN_UST
:
2254 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2255 ret
= LTTCOMM_NO_USTCONSUMERD
;
2259 case LTTNG_DOMAIN_KERNEL
:
2260 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2261 ret
= LTTCOMM_NO_KERNCONSUMERD
;
2269 * Check that the UID or GID match that of the tracing session.
2270 * The root user can interact with all sessions.
2272 if (need_tracing_session
) {
2273 if (!session_access_ok(cmd_ctx
->session
,
2274 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2275 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2276 ret
= LTTCOMM_EPERM
;
2281 /* Process by command type */
2282 switch (cmd_ctx
->lsm
->cmd_type
) {
2283 case LTTNG_ADD_CONTEXT
:
2285 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2286 cmd_ctx
->lsm
->u
.context
.channel_name
,
2287 cmd_ctx
->lsm
->u
.context
.event_name
,
2288 &cmd_ctx
->lsm
->u
.context
.ctx
);
2291 case LTTNG_DISABLE_CHANNEL
:
2293 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2294 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2297 case LTTNG_DISABLE_EVENT
:
2299 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2300 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2301 cmd_ctx
->lsm
->u
.disable
.name
);
2304 case LTTNG_DISABLE_ALL_EVENT
:
2306 DBG("Disabling all events");
2308 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2309 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2312 case LTTNG_DISABLE_CONSUMER
:
2314 ret
= cmd_disable_consumer(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
);
2317 case LTTNG_ENABLE_CHANNEL
:
2319 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2320 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2323 case LTTNG_ENABLE_CONSUMER
:
2326 * XXX: 0 means that this URI should be applied on the session. Should
2327 * be a DOMAIN enuam.
2329 ret
= cmd_enable_consumer(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
);
2330 if (ret
!= LTTCOMM_OK
) {
2334 if (cmd_ctx
->lsm
->domain
.type
== 0) {
2335 /* Add the URI for the UST session if a consumer is present. */
2336 if (cmd_ctx
->session
->ust_session
&&
2337 cmd_ctx
->session
->ust_session
->consumer
) {
2338 ret
= cmd_enable_consumer(LTTNG_DOMAIN_UST
, cmd_ctx
->session
);
2339 } else if (cmd_ctx
->session
->kernel_session
&&
2340 cmd_ctx
->session
->kernel_session
->consumer
) {
2341 ret
= cmd_enable_consumer(LTTNG_DOMAIN_KERNEL
,
2347 case LTTNG_ENABLE_EVENT
:
2349 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2350 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2351 &cmd_ctx
->lsm
->u
.enable
.event
, kernel_poll_pipe
[1]);
2354 case LTTNG_ENABLE_ALL_EVENT
:
2356 DBG("Enabling all events");
2358 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2359 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2360 cmd_ctx
->lsm
->u
.enable
.event
.type
, kernel_poll_pipe
[1]);
2363 case LTTNG_LIST_TRACEPOINTS
:
2365 struct lttng_event
*events
;
2368 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2369 if (nb_events
< 0) {
2375 * Setup lttng message with payload size set to the event list size in
2376 * bytes and then copy list into the llm payload.
2378 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2384 /* Copy event list into message payload */
2385 memcpy(cmd_ctx
->llm
->payload
, events
,
2386 sizeof(struct lttng_event
) * nb_events
);
2393 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2395 struct lttng_event_field
*fields
;
2398 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2400 if (nb_fields
< 0) {
2406 * Setup lttng message with payload size set to the event list size in
2407 * bytes and then copy list into the llm payload.
2409 ret
= setup_lttng_msg(cmd_ctx
,
2410 sizeof(struct lttng_event_field
) * nb_fields
);
2416 /* Copy event list into message payload */
2417 memcpy(cmd_ctx
->llm
->payload
, fields
,
2418 sizeof(struct lttng_event_field
) * nb_fields
);
2425 case LTTNG_SET_CONSUMER_URI
:
2428 struct lttng_uri
*uris
;
2430 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2431 len
= nb_uri
* sizeof(struct lttng_uri
);
2434 ret
= LTTCOMM_INVALID
;
2438 uris
= zmalloc(len
);
2440 ret
= LTTCOMM_FATAL
;
2444 /* Receive variable len data */
2445 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
2446 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2448 DBG("No URIs received from client... continuing");
2450 ret
= LTTCOMM_SESSION_FAIL
;
2454 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
2456 if (ret
!= LTTCOMM_OK
) {
2461 * XXX: 0 means that this URI should be applied on the session. Should
2462 * be a DOMAIN enuam.
2464 if (cmd_ctx
->lsm
->domain
.type
== 0) {
2465 /* Add the URI for the UST session if a consumer is present. */
2466 if (cmd_ctx
->session
->ust_session
&&
2467 cmd_ctx
->session
->ust_session
->consumer
) {
2468 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
2470 } else if (cmd_ctx
->session
->kernel_session
&&
2471 cmd_ctx
->session
->kernel_session
->consumer
) {
2472 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
2473 cmd_ctx
->session
, nb_uri
, uris
);
2479 case LTTNG_START_TRACE
:
2481 ret
= cmd_start_trace(cmd_ctx
->session
);
2484 case LTTNG_STOP_TRACE
:
2486 ret
= cmd_stop_trace(cmd_ctx
->session
);
2489 case LTTNG_CREATE_SESSION
:
2492 struct lttng_uri
*uris
= NULL
;
2494 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2495 len
= nb_uri
* sizeof(struct lttng_uri
);
2498 uris
= zmalloc(len
);
2500 ret
= LTTCOMM_FATAL
;
2504 /* Receive variable len data */
2505 DBG("Waiting for %zu URIs from client ...", nb_uri
);
2506 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2508 DBG("No URIs received from client... continuing");
2510 ret
= LTTCOMM_SESSION_FAIL
;
2514 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
2515 DBG("Creating session with ONE network URI is a bad call");
2516 ret
= LTTCOMM_SESSION_FAIL
;
2521 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
2526 case LTTNG_DESTROY_SESSION
:
2528 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
2530 /* Set session to NULL so we do not unlock it after free. */
2531 cmd_ctx
->session
= NULL
;
2534 case LTTNG_LIST_DOMAINS
:
2537 struct lttng_domain
*domains
;
2539 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
2545 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
2550 /* Copy event list into message payload */
2551 memcpy(cmd_ctx
->llm
->payload
, domains
,
2552 nb_dom
* sizeof(struct lttng_domain
));
2559 case LTTNG_LIST_CHANNELS
:
2562 struct lttng_channel
*channels
;
2564 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
2565 cmd_ctx
->session
, &channels
);
2571 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
2576 /* Copy event list into message payload */
2577 memcpy(cmd_ctx
->llm
->payload
, channels
,
2578 nb_chan
* sizeof(struct lttng_channel
));
2585 case LTTNG_LIST_EVENTS
:
2588 struct lttng_event
*events
= NULL
;
2590 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
2591 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
2597 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
2602 /* Copy event list into message payload */
2603 memcpy(cmd_ctx
->llm
->payload
, events
,
2604 nb_event
* sizeof(struct lttng_event
));
2611 case LTTNG_LIST_SESSIONS
:
2613 unsigned int nr_sessions
;
2615 session_lock_list();
2616 nr_sessions
= lttng_sessions_count(
2617 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2618 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
2620 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
2622 session_unlock_list();
2626 /* Filled the session array */
2627 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
2628 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2629 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
2631 session_unlock_list();
2636 case LTTNG_CALIBRATE
:
2638 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
2639 &cmd_ctx
->lsm
->u
.calibrate
);
2642 case LTTNG_REGISTER_CONSUMER
:
2644 struct consumer_data
*cdata
;
2646 switch (cmd_ctx
->lsm
->domain
.type
) {
2647 case LTTNG_DOMAIN_KERNEL
:
2648 cdata
= &kconsumer_data
;
2655 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2656 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
2659 case LTTNG_SET_FILTER
:
2661 struct lttng_filter_bytecode
*bytecode
;
2663 if (cmd_ctx
->lsm
->u
.filter
.bytecode_len
> 65336) {
2664 ret
= LTTCOMM_FILTER_INVAL
;
2667 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.filter
.bytecode_len
);
2669 ret
= LTTCOMM_FILTER_NOMEM
;
2672 /* Receive var. len. data */
2673 DBG("Receiving var len data from client ...");
2674 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
2675 cmd_ctx
->lsm
->u
.filter
.bytecode_len
);
2677 DBG("Nothing recv() from client var len data... continuing");
2679 ret
= LTTCOMM_FILTER_INVAL
;
2683 if (bytecode
->len
+ sizeof(*bytecode
)
2684 != cmd_ctx
->lsm
->u
.filter
.bytecode_len
) {
2686 ret
= LTTCOMM_FILTER_INVAL
;
2690 ret
= cmd_set_filter(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2691 cmd_ctx
->lsm
->u
.filter
.channel_name
,
2692 cmd_ctx
->lsm
->u
.filter
.event_name
,
2702 if (cmd_ctx
->llm
== NULL
) {
2703 DBG("Missing llm structure. Allocating one.");
2704 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2708 /* Set return code */
2709 cmd_ctx
->llm
->ret_code
= ret
;
2711 if (cmd_ctx
->session
) {
2712 session_unlock(cmd_ctx
->session
);
2714 if (need_tracing_session
) {
2715 session_unlock_list();
2722 * Thread managing health check socket.
2724 static void *thread_manage_health(void *data
)
2726 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
2727 uint32_t revents
, nb_fd
;
2728 struct lttng_poll_event events
;
2729 struct lttcomm_health_msg msg
;
2730 struct lttcomm_health_data reply
;
2732 DBG("[thread] Manage health check started");
2734 rcu_register_thread();
2736 /* Create unix socket */
2737 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
2739 ERR("Unable to create health check Unix socket");
2744 ret
= lttcomm_listen_unix_sock(sock
);
2750 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2751 * more will be added to this poll set.
2753 ret
= create_thread_poll_set(&events
, 2);
2758 /* Add the application registration socket */
2759 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
2765 DBG("Health check ready");
2767 nb_fd
= LTTNG_POLL_GETNB(&events
);
2769 /* Inifinite blocking call, waiting for transmission */
2771 ret
= lttng_poll_wait(&events
, -1);
2774 * Restart interrupted system call.
2776 if (errno
== EINTR
) {
2782 for (i
= 0; i
< nb_fd
; i
++) {
2783 /* Fetch once the poll data */
2784 revents
= LTTNG_POLL_GETEV(&events
, i
);
2785 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2787 /* Thread quit pipe has been closed. Killing thread. */
2788 ret
= check_thread_quit_pipe(pollfd
, revents
);
2794 /* Event on the registration socket */
2795 if (pollfd
== sock
) {
2796 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2797 ERR("Health socket poll error");
2803 new_sock
= lttcomm_accept_unix_sock(sock
);
2808 DBG("Receiving data from client for health...");
2809 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
2811 DBG("Nothing recv() from client... continuing");
2812 ret
= close(new_sock
);
2820 rcu_thread_online();
2822 switch (msg
.component
) {
2823 case LTTNG_HEALTH_CMD
:
2824 reply
.ret_code
= health_check_state(&health_thread_cmd
);
2826 case LTTNG_HEALTH_APP_MANAGE
:
2827 reply
.ret_code
= health_check_state(&health_thread_app_manage
);
2829 case LTTNG_HEALTH_APP_REG
:
2830 reply
.ret_code
= health_check_state(&health_thread_app_reg
);
2832 case LTTNG_HEALTH_KERNEL
:
2833 reply
.ret_code
= health_check_state(&health_thread_kernel
);
2835 case LTTNG_HEALTH_CONSUMER
:
2836 reply
.ret_code
= check_consumer_health();
2838 case LTTNG_HEALTH_ALL
:
2840 health_check_state(&health_thread_app_manage
) &&
2841 health_check_state(&health_thread_app_reg
) &&
2842 health_check_state(&health_thread_cmd
) &&
2843 health_check_state(&health_thread_kernel
) &&
2844 check_consumer_health();
2847 reply
.ret_code
= LTTCOMM_UND
;
2852 * Flip ret value since 0 is a success and 1 indicates a bad health for
2853 * the client where in the sessiond it is the opposite. Again, this is
2854 * just to make things easier for us poor developer which enjoy a lot
2857 if (reply
.ret_code
== 0 || reply
.ret_code
== 1) {
2858 reply
.ret_code
= !reply
.ret_code
;
2861 DBG2("Health check return value %d", reply
.ret_code
);
2863 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
2865 ERR("Failed to send health data back to client");
2868 /* End of transmission */
2869 ret
= close(new_sock
);
2879 ERR("Health error occurred in %s", __func__
);
2881 DBG("Health check thread dying");
2882 unlink(health_unix_sock_path
);
2889 if (new_sock
>= 0) {
2890 ret
= close(new_sock
);
2896 lttng_poll_clean(&events
);
2898 rcu_unregister_thread();
2903 * This thread manage all clients request using the unix client socket for
2906 static void *thread_manage_clients(void *data
)
2908 int sock
= -1, ret
, i
, pollfd
, err
= -1;
2910 uint32_t revents
, nb_fd
;
2911 struct command_ctx
*cmd_ctx
= NULL
;
2912 struct lttng_poll_event events
;
2914 DBG("[thread] Manage client started");
2916 rcu_register_thread();
2918 health_code_update(&health_thread_cmd
);
2920 ret
= lttcomm_listen_unix_sock(client_sock
);
2926 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2927 * more will be added to this poll set.
2929 ret
= create_thread_poll_set(&events
, 2);
2934 /* Add the application registration socket */
2935 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
2941 * Notify parent pid that we are ready to accept command for client side.
2943 if (opt_sig_parent
) {
2944 kill(ppid
, SIGUSR1
);
2947 health_code_update(&health_thread_cmd
);
2950 DBG("Accepting client command ...");
2952 nb_fd
= LTTNG_POLL_GETNB(&events
);
2954 /* Inifinite blocking call, waiting for transmission */
2956 health_poll_update(&health_thread_cmd
);
2957 ret
= lttng_poll_wait(&events
, -1);
2958 health_poll_update(&health_thread_cmd
);
2961 * Restart interrupted system call.
2963 if (errno
== EINTR
) {
2969 for (i
= 0; i
< nb_fd
; i
++) {
2970 /* Fetch once the poll data */
2971 revents
= LTTNG_POLL_GETEV(&events
, i
);
2972 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2974 health_code_update(&health_thread_cmd
);
2976 /* Thread quit pipe has been closed. Killing thread. */
2977 ret
= check_thread_quit_pipe(pollfd
, revents
);
2983 /* Event on the registration socket */
2984 if (pollfd
== client_sock
) {
2985 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2986 ERR("Client socket poll error");
2992 DBG("Wait for client response");
2994 health_code_update(&health_thread_cmd
);
2996 sock
= lttcomm_accept_unix_sock(client_sock
);
3001 /* Set socket option for credentials retrieval */
3002 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3007 /* Allocate context command to process the client request */
3008 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3009 if (cmd_ctx
== NULL
) {
3010 PERROR("zmalloc cmd_ctx");
3014 /* Allocate data buffer for reception */
3015 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3016 if (cmd_ctx
->lsm
== NULL
) {
3017 PERROR("zmalloc cmd_ctx->lsm");
3021 cmd_ctx
->llm
= NULL
;
3022 cmd_ctx
->session
= NULL
;
3024 health_code_update(&health_thread_cmd
);
3027 * Data is received from the lttng client. The struct
3028 * lttcomm_session_msg (lsm) contains the command and data request of
3031 DBG("Receiving data from client ...");
3032 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3033 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3035 DBG("Nothing recv() from client... continuing");
3041 clean_command_ctx(&cmd_ctx
);
3045 health_code_update(&health_thread_cmd
);
3047 // TODO: Validate cmd_ctx including sanity check for
3048 // security purpose.
3050 rcu_thread_online();
3052 * This function dispatch the work to the kernel or userspace tracer
3053 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3054 * informations for the client. The command context struct contains
3055 * everything this function may needs.
3057 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3058 rcu_thread_offline();
3068 * TODO: Inform client somehow of the fatal error. At
3069 * this point, ret < 0 means that a zmalloc failed
3070 * (ENOMEM). Error detected but still accept
3071 * command, unless a socket error has been
3074 clean_command_ctx(&cmd_ctx
);
3078 health_code_update(&health_thread_cmd
);
3080 DBG("Sending response (size: %d, retcode: %s)",
3081 cmd_ctx
->lttng_msg_size
,
3082 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3083 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3085 ERR("Failed to send data back to client");
3088 /* End of transmission */
3095 clean_command_ctx(&cmd_ctx
);
3097 health_code_update(&health_thread_cmd
);
3103 health_error(&health_thread_cmd
);
3104 ERR("Health error occurred in %s", __func__
);
3106 health_exit(&health_thread_cmd
);
3108 DBG("Client thread dying");
3109 unlink(client_unix_sock_path
);
3110 if (client_sock
>= 0) {
3111 ret
= close(client_sock
);
3123 lttng_poll_clean(&events
);
3124 clean_command_ctx(&cmd_ctx
);
3126 rcu_unregister_thread();
3132 * usage function on stderr
3134 static void usage(void)
3136 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3137 fprintf(stderr
, " -h, --help Display this usage.\n");
3138 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3139 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3140 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3141 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3142 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3143 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3144 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3145 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3146 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3147 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3148 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3149 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3150 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3151 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3152 fprintf(stderr
, " -V, --version Show version number.\n");
3153 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3154 fprintf(stderr
, " -q, --quiet No output at all.\n");
3155 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3156 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3157 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3161 * daemon argument parsing
3163 static int parse_args(int argc
, char **argv
)
3167 static struct option long_options
[] = {
3168 { "client-sock", 1, 0, 'c' },
3169 { "apps-sock", 1, 0, 'a' },
3170 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3171 { "kconsumerd-err-sock", 1, 0, 'E' },
3172 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3173 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3174 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3175 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3176 { "consumerd32-path", 1, 0, 'u' },
3177 { "consumerd32-libdir", 1, 0, 'U' },
3178 { "consumerd64-path", 1, 0, 't' },
3179 { "consumerd64-libdir", 1, 0, 'T' },
3180 { "daemonize", 0, 0, 'd' },
3181 { "sig-parent", 0, 0, 'S' },
3182 { "help", 0, 0, 'h' },
3183 { "group", 1, 0, 'g' },
3184 { "version", 0, 0, 'V' },
3185 { "quiet", 0, 0, 'q' },
3186 { "verbose", 0, 0, 'v' },
3187 { "verbose-consumer", 0, 0, 'Z' },
3188 { "no-kernel", 0, 0, 'N' },
3193 int option_index
= 0;
3194 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3195 long_options
, &option_index
);
3202 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3204 fprintf(stderr
, " with arg %s\n", optarg
);
3208 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3211 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3217 opt_tracing_group
= optarg
;
3223 fprintf(stdout
, "%s\n", VERSION
);
3229 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3232 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3235 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3238 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3241 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3244 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3250 lttng_opt_quiet
= 1;
3253 /* Verbose level can increase using multiple -v */
3254 lttng_opt_verbose
+= 1;
3257 opt_verbose_consumer
+= 1;
3260 consumerd32_bin
= optarg
;
3263 consumerd32_libdir
= optarg
;
3266 consumerd64_bin
= optarg
;
3269 consumerd64_libdir
= optarg
;
3272 /* Unknown option or other error.
3273 * Error is printed by getopt, just return */
3282 * Creates the two needed socket by the daemon.
3283 * apps_sock - The communication socket for all UST apps.
3284 * client_sock - The communication of the cli tool (lttng).
3286 static int init_daemon_socket(void)
3291 old_umask
= umask(0);
3293 /* Create client tool unix socket */
3294 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3295 if (client_sock
< 0) {
3296 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3301 /* File permission MUST be 660 */
3302 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3304 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3309 /* Create the application unix socket */
3310 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3311 if (apps_sock
< 0) {
3312 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3317 /* File permission MUST be 666 */
3318 ret
= chmod(apps_unix_sock_path
,
3319 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3321 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3332 * Check if the global socket is available, and if a daemon is answering at the
3333 * other side. If yes, error is returned.
3335 static int check_existing_daemon(void)
3337 /* Is there anybody out there ? */
3338 if (lttng_session_daemon_alive()) {
3346 * Set the tracing group gid onto the client socket.
3348 * Race window between mkdir and chown is OK because we are going from more
3349 * permissive (root.root) to less permissive (root.tracing).
3351 static int set_permissions(char *rundir
)
3356 ret
= allowed_group();
3358 WARN("No tracing group detected");
3365 /* Set lttng run dir */
3366 ret
= chown(rundir
, 0, gid
);
3368 ERR("Unable to set group on %s", rundir
);
3372 /* Ensure tracing group can search the run dir */
3373 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
3375 ERR("Unable to set permissions on %s", rundir
);
3379 /* lttng client socket path */
3380 ret
= chown(client_unix_sock_path
, 0, gid
);
3382 ERR("Unable to set group on %s", client_unix_sock_path
);
3386 /* kconsumer error socket path */
3387 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3389 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3393 /* 64-bit ustconsumer error socket path */
3394 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
3396 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
3400 /* 32-bit ustconsumer compat32 error socket path */
3401 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
3403 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
3407 DBG("All permissions are set");
3414 * Create the lttng run directory needed for all global sockets and pipe.
3416 static int create_lttng_rundir(const char *rundir
)
3420 DBG3("Creating LTTng run directory: %s", rundir
);
3422 ret
= mkdir(rundir
, S_IRWXU
);
3424 if (errno
!= EEXIST
) {
3425 ERR("Unable to create %s", rundir
);
3437 * Setup sockets and directory needed by the kconsumerd communication with the
3440 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
3444 char path
[PATH_MAX
];
3446 switch (consumer_data
->type
) {
3447 case LTTNG_CONSUMER_KERNEL
:
3448 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
3450 case LTTNG_CONSUMER64_UST
:
3451 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
3453 case LTTNG_CONSUMER32_UST
:
3454 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
3457 ERR("Consumer type unknown");
3462 DBG2("Creating consumer directory: %s", path
);
3464 ret
= mkdir(path
, S_IRWXU
);
3466 if (errno
!= EEXIST
) {
3468 ERR("Failed to create %s", path
);
3474 /* Create the kconsumerd error unix socket */
3475 consumer_data
->err_sock
=
3476 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3477 if (consumer_data
->err_sock
< 0) {
3478 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3483 /* File permission MUST be 660 */
3484 ret
= chmod(consumer_data
->err_unix_sock_path
,
3485 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3487 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3497 * Signal handler for the daemon
3499 * Simply stop all worker threads, leaving main() return gracefully after
3500 * joining all threads and calling cleanup().
3502 static void sighandler(int sig
)
3506 DBG("SIGPIPE caught");
3509 DBG("SIGINT caught");
3513 DBG("SIGTERM caught");
3522 * Setup signal handler for :
3523 * SIGINT, SIGTERM, SIGPIPE
3525 static int set_signal_handler(void)
3528 struct sigaction sa
;
3531 if ((ret
= sigemptyset(&sigset
)) < 0) {
3532 PERROR("sigemptyset");
3536 sa
.sa_handler
= sighandler
;
3537 sa
.sa_mask
= sigset
;
3539 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3540 PERROR("sigaction");
3544 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3545 PERROR("sigaction");
3549 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3550 PERROR("sigaction");
3554 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3560 * Set open files limit to unlimited. This daemon can open a large number of
3561 * file descriptors in order to consumer multiple kernel traces.
3563 static void set_ulimit(void)
3568 /* The kernel does not allowed an infinite limit for open files */
3569 lim
.rlim_cur
= 65535;
3570 lim
.rlim_max
= 65535;
3572 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3574 PERROR("failed to set open files limit");
3581 int main(int argc
, char **argv
)
3585 const char *home_path
;
3587 init_kernel_workarounds();
3589 rcu_register_thread();
3591 setup_consumerd_path();
3593 /* Parse arguments */
3595 if ((ret
= parse_args(argc
, argv
) < 0)) {
3605 * child: setsid, close FD 0, 1, 2, chdir /
3606 * parent: exit (if fork is successful)
3614 * We are in the child. Make sure all other file
3615 * descriptors are closed, in case we are called with
3616 * more opened file descriptors than the standard ones.
3618 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
3623 /* Create thread quit pipe */
3624 if ((ret
= init_thread_quit_pipe()) < 0) {
3628 /* Check if daemon is UID = 0 */
3629 is_root
= !getuid();
3632 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
3634 /* Create global run dir with root access */
3635 ret
= create_lttng_rundir(rundir
);
3640 if (strlen(apps_unix_sock_path
) == 0) {
3641 snprintf(apps_unix_sock_path
, PATH_MAX
,
3642 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3645 if (strlen(client_unix_sock_path
) == 0) {
3646 snprintf(client_unix_sock_path
, PATH_MAX
,
3647 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3650 /* Set global SHM for ust */
3651 if (strlen(wait_shm_path
) == 0) {
3652 snprintf(wait_shm_path
, PATH_MAX
,
3653 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3656 if (strlen(health_unix_sock_path
) == 0) {
3657 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
3658 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
3661 /* Setup kernel consumerd path */
3662 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
3663 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
3664 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
3665 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
3667 DBG2("Kernel consumer err path: %s",
3668 kconsumer_data
.err_unix_sock_path
);
3669 DBG2("Kernel consumer cmd path: %s",
3670 kconsumer_data
.cmd_unix_sock_path
);
3672 home_path
= get_home_dir();
3673 if (home_path
== NULL
) {
3674 /* TODO: Add --socket PATH option */
3675 ERR("Can't get HOME directory for sockets creation.");
3681 * Create rundir from home path. This will create something like
3684 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
3690 ret
= create_lttng_rundir(rundir
);
3695 if (strlen(apps_unix_sock_path
) == 0) {
3696 snprintf(apps_unix_sock_path
, PATH_MAX
,
3697 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3700 /* Set the cli tool unix socket path */
3701 if (strlen(client_unix_sock_path
) == 0) {
3702 snprintf(client_unix_sock_path
, PATH_MAX
,
3703 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3706 /* Set global SHM for ust */
3707 if (strlen(wait_shm_path
) == 0) {
3708 snprintf(wait_shm_path
, PATH_MAX
,
3709 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3712 /* Set health check Unix path */
3713 if (strlen(health_unix_sock_path
) == 0) {
3714 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
3715 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
3719 /* Set consumer initial state */
3720 kernel_consumerd_state
= CONSUMER_STOPPED
;
3721 ust_consumerd_state
= CONSUMER_STOPPED
;
3723 DBG("Client socket path %s", client_unix_sock_path
);
3724 DBG("Application socket path %s", apps_unix_sock_path
);
3725 DBG("LTTng run directory path: %s", rundir
);
3727 /* 32 bits consumerd path setup */
3728 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
3729 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
3730 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
3731 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
3733 DBG2("UST consumer 32 bits err path: %s",
3734 ustconsumer32_data
.err_unix_sock_path
);
3735 DBG2("UST consumer 32 bits cmd path: %s",
3736 ustconsumer32_data
.cmd_unix_sock_path
);
3738 /* 64 bits consumerd path setup */
3739 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
3740 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
3741 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
3742 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
3744 DBG2("UST consumer 64 bits err path: %s",
3745 ustconsumer64_data
.err_unix_sock_path
);
3746 DBG2("UST consumer 64 bits cmd path: %s",
3747 ustconsumer64_data
.cmd_unix_sock_path
);
3750 * See if daemon already exist.
3752 if ((ret
= check_existing_daemon()) < 0) {
3753 ERR("Already running daemon.\n");
3755 * We do not goto exit because we must not cleanup()
3756 * because a daemon is already running.
3762 * Init UST app hash table. Alloc hash table before this point since
3763 * cleanup() can get called after that point.
3767 /* After this point, we can safely call cleanup() with "goto exit" */
3770 * These actions must be executed as root. We do that *after* setting up
3771 * the sockets path because we MUST make the check for another daemon using
3772 * those paths *before* trying to set the kernel consumer sockets and init
3776 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
3781 /* Setup kernel tracer */
3782 if (!opt_no_kernel
) {
3783 init_kernel_tracer();
3786 /* Set ulimit for open files */
3789 /* init lttng_fd tracking must be done after set_ulimit. */
3792 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
3797 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
3802 if ((ret
= set_signal_handler()) < 0) {
3806 /* Setup the needed unix socket */
3807 if ((ret
= init_daemon_socket()) < 0) {
3811 /* Set credentials to socket */
3812 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
3816 /* Get parent pid if -S, --sig-parent is specified. */
3817 if (opt_sig_parent
) {
3821 /* Setup the kernel pipe for waking up the kernel thread */
3822 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
3826 /* Setup the thread apps communication pipe. */
3827 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
3831 /* Init UST command queue. */
3832 cds_wfq_init(&ust_cmd_queue
.queue
);
3835 * Get session list pointer. This pointer MUST NOT be free(). This list is
3836 * statically declared in session.c
3838 session_list_ptr
= session_get_list();
3840 /* Set up max poll set size */
3841 lttng_poll_set_max_size();
3845 /* Init all health thread counters. */
3846 health_init(&health_thread_cmd
);
3847 health_init(&health_thread_kernel
);
3848 health_init(&health_thread_app_manage
);
3849 health_init(&health_thread_app_reg
);
3852 * Init health counters of the consumer thread. We do a quick hack here to
3853 * the state of the consumer health is fine even if the thread is not
3854 * started. This is simply to ease our life and has no cost what so ever.
3856 health_init(&kconsumer_data
.health
);
3857 health_poll_update(&kconsumer_data
.health
);
3858 health_init(&ustconsumer32_data
.health
);
3859 health_poll_update(&ustconsumer32_data
.health
);
3860 health_init(&ustconsumer64_data
.health
);
3861 health_poll_update(&ustconsumer64_data
.health
);
3863 /* Create thread to manage the client socket */
3864 ret
= pthread_create(&health_thread
, NULL
,
3865 thread_manage_health
, (void *) NULL
);
3867 PERROR("pthread_create health");
3871 /* Create thread to manage the client socket */
3872 ret
= pthread_create(&client_thread
, NULL
,
3873 thread_manage_clients
, (void *) NULL
);
3875 PERROR("pthread_create clients");
3879 /* Create thread to dispatch registration */
3880 ret
= pthread_create(&dispatch_thread
, NULL
,
3881 thread_dispatch_ust_registration
, (void *) NULL
);
3883 PERROR("pthread_create dispatch");
3887 /* Create thread to manage application registration. */
3888 ret
= pthread_create(®_apps_thread
, NULL
,
3889 thread_registration_apps
, (void *) NULL
);
3891 PERROR("pthread_create registration");
3895 /* Create thread to manage application socket */
3896 ret
= pthread_create(&apps_thread
, NULL
,
3897 thread_manage_apps
, (void *) NULL
);
3899 PERROR("pthread_create apps");
3903 /* Create kernel thread to manage kernel event */
3904 ret
= pthread_create(&kernel_thread
, NULL
,
3905 thread_manage_kernel
, (void *) NULL
);
3907 PERROR("pthread_create kernel");
3911 ret
= pthread_join(kernel_thread
, &status
);
3913 PERROR("pthread_join");
3914 goto error
; /* join error, exit without cleanup */
3918 ret
= pthread_join(apps_thread
, &status
);
3920 PERROR("pthread_join");
3921 goto error
; /* join error, exit without cleanup */
3925 ret
= pthread_join(reg_apps_thread
, &status
);
3927 PERROR("pthread_join");
3928 goto error
; /* join error, exit without cleanup */
3932 ret
= pthread_join(dispatch_thread
, &status
);
3934 PERROR("pthread_join");
3935 goto error
; /* join error, exit without cleanup */
3939 ret
= pthread_join(client_thread
, &status
);
3941 PERROR("pthread_join");
3942 goto error
; /* join error, exit without cleanup */
3945 ret
= join_consumer_thread(&kconsumer_data
);
3947 PERROR("join_consumer");
3948 goto error
; /* join error, exit without cleanup */
3955 * cleanup() is called when no other thread is running.
3957 rcu_thread_online();
3959 rcu_thread_offline();
3960 rcu_unregister_thread();