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 .metadata_sock
.fd
= -1,
94 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
95 .lock
= PTHREAD_MUTEX_INITIALIZER
,
96 .cond
= PTHREAD_COND_INITIALIZER
,
97 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
99 static struct consumer_data ustconsumer64_data
= {
100 .type
= LTTNG_CONSUMER64_UST
,
101 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
102 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
105 .metadata_sock
.fd
= -1,
106 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
107 .lock
= PTHREAD_MUTEX_INITIALIZER
,
108 .cond
= PTHREAD_COND_INITIALIZER
,
109 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
111 static struct consumer_data ustconsumer32_data
= {
112 .type
= LTTNG_CONSUMER32_UST
,
113 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
114 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
117 .metadata_sock
.fd
= -1,
118 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
119 .lock
= PTHREAD_MUTEX_INITIALIZER
,
120 .cond
= PTHREAD_COND_INITIALIZER
,
121 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
124 /* Shared between threads */
125 static int dispatch_thread_exit
;
127 /* Global application Unix socket path */
128 static char apps_unix_sock_path
[PATH_MAX
];
129 /* Global client Unix socket path */
130 static char client_unix_sock_path
[PATH_MAX
];
131 /* global wait shm path for UST */
132 static char wait_shm_path
[PATH_MAX
];
133 /* Global health check unix path */
134 static char health_unix_sock_path
[PATH_MAX
];
136 /* Sockets and FDs */
137 static int client_sock
= -1;
138 static int apps_sock
= -1;
139 int kernel_tracer_fd
= -1;
140 static int kernel_poll_pipe
[2] = { -1, -1 };
143 * Quit pipe for all threads. This permits a single cancellation point
144 * for all threads when receiving an event on the pipe.
146 static int thread_quit_pipe
[2] = { -1, -1 };
149 * This pipe is used to inform the thread managing application communication
150 * that a command is queued and ready to be processed.
152 static int apps_cmd_pipe
[2] = { -1, -1 };
154 int apps_cmd_notify_pipe
[2] = { -1, -1 };
156 /* Pthread, Mutexes and Semaphores */
157 static pthread_t apps_thread
;
158 static pthread_t apps_notify_thread
;
159 static pthread_t reg_apps_thread
;
160 static pthread_t client_thread
;
161 static pthread_t kernel_thread
;
162 static pthread_t dispatch_thread
;
163 static pthread_t health_thread
;
164 static pthread_t ht_cleanup_thread
;
167 * UST registration command queue. This queue is tied with a futex and uses a N
168 * wakers / 1 waiter implemented and detailed in futex.c/.h
170 * The thread_manage_apps and thread_dispatch_ust_registration interact with
171 * this queue and the wait/wake scheme.
173 static struct ust_cmd_queue ust_cmd_queue
;
176 * Pointer initialized before thread creation.
178 * This points to the tracing session list containing the session count and a
179 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
180 * MUST NOT be taken if you call a public function in session.c.
182 * The lock is nested inside the structure: session_list_ptr->lock. Please use
183 * session_lock_list and session_unlock_list for lock acquisition.
185 static struct ltt_session_list
*session_list_ptr
;
187 int ust_consumerd64_fd
= -1;
188 int ust_consumerd32_fd
= -1;
190 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
191 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
192 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
193 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
195 static const char *module_proc_lttng
= "/proc/lttng";
198 * Consumer daemon state which is changed when spawning it, killing it or in
199 * case of a fatal error.
201 enum consumerd_state
{
202 CONSUMER_STARTED
= 1,
203 CONSUMER_STOPPED
= 2,
208 * This consumer daemon state is used to validate if a client command will be
209 * able to reach the consumer. If not, the client is informed. For instance,
210 * doing a "lttng start" when the consumer state is set to ERROR will return an
211 * error to the client.
213 * The following example shows a possible race condition of this scheme:
215 * consumer thread error happens
217 * client cmd checks state -> still OK
218 * consumer thread exit, sets error
219 * client cmd try to talk to consumer
222 * However, since the consumer is a different daemon, we have no way of making
223 * sure the command will reach it safely even with this state flag. This is why
224 * we consider that up to the state validation during command processing, the
225 * command is safe. After that, we can not guarantee the correctness of the
226 * client request vis-a-vis the consumer.
228 static enum consumerd_state ust_consumerd_state
;
229 static enum consumerd_state kernel_consumerd_state
;
232 * Socket timeout for receiving and sending in seconds.
234 static int app_socket_timeout
;
236 /* Set in main() with the current page size. */
239 /* If set to nonzero, spawn the consumer with valgrind. */
240 static int consumer_debug_valgrind
;
243 void setup_consumerd_path(void)
245 const char *bin
, *libdir
;
248 * Allow INSTALL_BIN_PATH to be used as a target path for the
249 * native architecture size consumer if CONFIG_CONSUMER*_PATH
250 * has not been defined.
252 #if (CAA_BITS_PER_LONG == 32)
253 if (!consumerd32_bin
[0]) {
254 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
256 if (!consumerd32_libdir
[0]) {
257 consumerd32_libdir
= INSTALL_LIB_PATH
;
259 #elif (CAA_BITS_PER_LONG == 64)
260 if (!consumerd64_bin
[0]) {
261 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
263 if (!consumerd64_libdir
[0]) {
264 consumerd64_libdir
= INSTALL_LIB_PATH
;
267 #error "Unknown bitness"
271 * runtime env. var. overrides the build default.
273 bin
= getenv("LTTNG_CONSUMERD32_BIN");
275 consumerd32_bin
= bin
;
277 bin
= getenv("LTTNG_CONSUMERD64_BIN");
279 consumerd64_bin
= bin
;
281 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
283 consumerd32_libdir
= libdir
;
285 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
287 consumerd64_libdir
= libdir
;
292 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
294 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
300 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
306 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
318 * Check if the thread quit pipe was triggered.
320 * Return 1 if it was triggered else 0;
322 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
324 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
332 * Return group ID of the tracing group or -1 if not found.
334 static gid_t
allowed_group(void)
338 if (opt_tracing_group
) {
339 grp
= getgrnam(opt_tracing_group
);
341 grp
= getgrnam(default_tracing_group
);
351 * Init thread quit pipe.
353 * Return -1 on error or 0 if all pipes are created.
355 static int init_thread_quit_pipe(void)
359 ret
= pipe(thread_quit_pipe
);
361 PERROR("thread quit pipe");
365 for (i
= 0; i
< 2; i
++) {
366 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
378 * Stop all threads by closing the thread quit pipe.
380 static void stop_threads(void)
384 /* Stopping all threads */
385 DBG("Terminating all threads");
386 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
388 ERR("write error on thread quit pipe");
391 /* Dispatch thread */
392 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
393 futex_nto1_wake(&ust_cmd_queue
.futex
);
399 static void cleanup(void)
403 struct ltt_session
*sess
, *stmp
;
407 /* First thing first, stop all threads */
408 utils_close_pipe(thread_quit_pipe
);
411 * If opt_pidfile is undefined, the default file will be wiped when
412 * removing the rundir.
415 ret
= remove(opt_pidfile
);
417 PERROR("remove pidfile %s", opt_pidfile
);
421 DBG("Removing %s directory", rundir
);
422 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
424 ERR("asprintf failed. Something is really wrong!");
427 /* Remove lttng run directory */
430 ERR("Unable to clean %s", rundir
);
435 DBG("Cleaning up all sessions");
437 /* Destroy session list mutex */
438 if (session_list_ptr
!= NULL
) {
439 pthread_mutex_destroy(&session_list_ptr
->lock
);
441 /* Cleanup ALL session */
442 cds_list_for_each_entry_safe(sess
, stmp
,
443 &session_list_ptr
->head
, list
) {
444 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
448 DBG("Closing all UST sockets");
449 ust_app_clean_list();
450 buffer_reg_destroy_registries();
452 if (is_root
&& !opt_no_kernel
) {
453 DBG2("Closing kernel fd");
454 if (kernel_tracer_fd
>= 0) {
455 ret
= close(kernel_tracer_fd
);
460 DBG("Unloading kernel modules");
461 modprobe_remove_lttng_all();
465 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
466 "Matthew, BEET driven development works!%c[%dm",
467 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
472 * Send data on a unix socket using the liblttsessiondcomm API.
474 * Return lttcomm error code.
476 static int send_unix_sock(int sock
, void *buf
, size_t len
)
478 /* Check valid length */
483 return lttcomm_send_unix_sock(sock
, buf
, len
);
487 * Free memory of a command context structure.
489 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
491 DBG("Clean command context structure");
493 if ((*cmd_ctx
)->llm
) {
494 free((*cmd_ctx
)->llm
);
496 if ((*cmd_ctx
)->lsm
) {
497 free((*cmd_ctx
)->lsm
);
505 * Notify UST applications using the shm mmap futex.
507 static int notify_ust_apps(int active
)
511 DBG("Notifying applications of session daemon state: %d", active
);
513 /* See shm.c for this call implying mmap, shm and futex calls */
514 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
515 if (wait_shm_mmap
== NULL
) {
519 /* Wake waiting process */
520 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
522 /* Apps notified successfully */
530 * Setup the outgoing data buffer for the response (llm) by allocating the
531 * right amount of memory and copying the original information from the lsm
534 * Return total size of the buffer pointed by buf.
536 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
542 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
543 if (cmd_ctx
->llm
== NULL
) {
549 /* Copy common data */
550 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
551 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
553 cmd_ctx
->llm
->data_size
= size
;
554 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
563 * Update the kernel poll set of all channel fd available over all tracing
564 * session. Add the wakeup pipe at the end of the set.
566 static int update_kernel_poll(struct lttng_poll_event
*events
)
569 struct ltt_session
*session
;
570 struct ltt_kernel_channel
*channel
;
572 DBG("Updating kernel poll set");
575 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
576 session_lock(session
);
577 if (session
->kernel_session
== NULL
) {
578 session_unlock(session
);
582 cds_list_for_each_entry(channel
,
583 &session
->kernel_session
->channel_list
.head
, list
) {
584 /* Add channel fd to the kernel poll set */
585 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
587 session_unlock(session
);
590 DBG("Channel fd %d added to kernel set", channel
->fd
);
592 session_unlock(session
);
594 session_unlock_list();
599 session_unlock_list();
604 * Find the channel fd from 'fd' over all tracing session. When found, check
605 * for new channel stream and send those stream fds to the kernel consumer.
607 * Useful for CPU hotplug feature.
609 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
612 struct ltt_session
*session
;
613 struct ltt_kernel_session
*ksess
;
614 struct ltt_kernel_channel
*channel
;
616 DBG("Updating kernel streams for channel fd %d", fd
);
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
);
625 ksess
= session
->kernel_session
;
627 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
628 if (channel
->fd
== fd
) {
629 DBG("Channel found, updating kernel streams");
630 ret
= kernel_open_channel_stream(channel
);
636 * Have we already sent fds to the consumer? If yes, it means
637 * that tracing is started so it is safe to send our updated
640 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
641 struct lttng_ht_iter iter
;
642 struct consumer_socket
*socket
;
645 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
646 &iter
.iter
, socket
, node
.node
) {
647 /* Code flow error */
648 assert(socket
->fd
>= 0);
650 pthread_mutex_lock(socket
->lock
);
651 ret
= kernel_consumer_send_channel_stream(socket
,
653 session
->output_traces
? 1 : 0);
654 pthread_mutex_unlock(socket
->lock
);
665 session_unlock(session
);
667 session_unlock_list();
671 session_unlock(session
);
672 session_unlock_list();
677 * For each tracing session, update newly registered apps. The session list
678 * lock MUST be acquired before calling this.
680 static void update_ust_app(int app_sock
)
682 struct ltt_session
*sess
, *stmp
;
684 /* For all tracing session(s) */
685 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
687 if (sess
->ust_session
) {
688 ust_app_global_update(sess
->ust_session
, app_sock
);
690 session_unlock(sess
);
695 * This thread manage event coming from the kernel.
697 * Features supported in this thread:
700 static void *thread_manage_kernel(void *data
)
702 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
703 uint32_t revents
, nb_fd
;
705 struct lttng_poll_event events
;
707 DBG("[thread] Thread manage kernel started");
709 health_register(HEALTH_TYPE_KERNEL
);
712 * This first step of the while is to clean this structure which could free
713 * non NULL pointers so initialize it before the loop.
715 lttng_poll_init(&events
);
717 if (testpoint(thread_manage_kernel
)) {
718 goto error_testpoint
;
721 health_code_update();
723 if (testpoint(thread_manage_kernel_before_loop
)) {
724 goto error_testpoint
;
728 health_code_update();
730 if (update_poll_flag
== 1) {
731 /* Clean events object. We are about to populate it again. */
732 lttng_poll_clean(&events
);
734 ret
= sessiond_set_thread_pollset(&events
, 2);
736 goto error_poll_create
;
739 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
744 /* This will add the available kernel channel if any. */
745 ret
= update_kernel_poll(&events
);
749 update_poll_flag
= 0;
752 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
754 /* Poll infinite value of time */
757 ret
= lttng_poll_wait(&events
, -1);
761 * Restart interrupted system call.
763 if (errno
== EINTR
) {
767 } else if (ret
== 0) {
768 /* Should not happen since timeout is infinite */
769 ERR("Return value of poll is 0 with an infinite timeout.\n"
770 "This should not have happened! Continuing...");
776 for (i
= 0; i
< nb_fd
; i
++) {
777 /* Fetch once the poll data */
778 revents
= LTTNG_POLL_GETEV(&events
, i
);
779 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
781 health_code_update();
783 /* Thread quit pipe has been closed. Killing thread. */
784 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
790 /* Check for data on kernel pipe */
791 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
793 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
794 } while (ret
< 0 && errno
== EINTR
);
796 * Ret value is useless here, if this pipe gets any actions an
797 * update is required anyway.
799 update_poll_flag
= 1;
803 * New CPU detected by the kernel. Adding kernel stream to
804 * kernel session and updating the kernel consumer
806 if (revents
& LPOLLIN
) {
807 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
813 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
814 * and unregister kernel stream at this point.
823 lttng_poll_clean(&events
);
826 utils_close_pipe(kernel_poll_pipe
);
827 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
830 ERR("Health error occurred in %s", __func__
);
831 WARN("Kernel thread died unexpectedly. "
832 "Kernel tracing can continue but CPU hotplug is disabled.");
835 DBG("Kernel thread dying");
840 * Signal pthread condition of the consumer data that the thread.
842 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
844 pthread_mutex_lock(&data
->cond_mutex
);
847 * The state is set before signaling. It can be any value, it's the waiter
848 * job to correctly interpret this condition variable associated to the
849 * consumer pthread_cond.
851 * A value of 0 means that the corresponding thread of the consumer data
852 * was not started. 1 indicates that the thread has started and is ready
853 * for action. A negative value means that there was an error during the
856 data
->consumer_thread_is_ready
= state
;
857 (void) pthread_cond_signal(&data
->cond
);
859 pthread_mutex_unlock(&data
->cond_mutex
);
863 * This thread manage the consumer error sent back to the session daemon.
865 static void *thread_manage_consumer(void *data
)
867 int sock
= -1, i
, ret
, pollfd
, err
= -1;
868 uint32_t revents
, nb_fd
;
869 enum lttcomm_return_code code
;
870 struct lttng_poll_event events
;
871 struct consumer_data
*consumer_data
= data
;
873 DBG("[thread] Manage consumer started");
875 health_register(HEALTH_TYPE_CONSUMER
);
877 health_code_update();
880 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
881 * metadata_sock. Nothing more will be added to this poll set.
883 ret
= sessiond_set_thread_pollset(&events
, 3);
889 * The error socket here is already in a listening state which was done
890 * just before spawning this thread to avoid a race between the consumer
891 * daemon exec trying to connect and the listen() call.
893 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
898 health_code_update();
900 /* Infinite blocking call, waiting for transmission */
904 if (testpoint(thread_manage_consumer
)) {
908 ret
= lttng_poll_wait(&events
, -1);
912 * Restart interrupted system call.
914 if (errno
== EINTR
) {
922 for (i
= 0; i
< nb_fd
; i
++) {
923 /* Fetch once the poll data */
924 revents
= LTTNG_POLL_GETEV(&events
, i
);
925 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
927 health_code_update();
929 /* Thread quit pipe has been closed. Killing thread. */
930 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
936 /* Event on the registration socket */
937 if (pollfd
== consumer_data
->err_sock
) {
938 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
939 ERR("consumer err socket poll error");
945 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
951 * Set the CLOEXEC flag. Return code is useless because either way, the
954 (void) utils_set_fd_cloexec(sock
);
956 health_code_update();
958 DBG2("Receiving code from consumer err_sock");
960 /* Getting status code from kconsumerd */
961 ret
= lttcomm_recv_unix_sock(sock
, &code
,
962 sizeof(enum lttcomm_return_code
));
967 health_code_update();
969 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
970 /* Connect both socket, command and metadata. */
971 consumer_data
->cmd_sock
=
972 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
973 consumer_data
->metadata_sock
.fd
=
974 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
975 if (consumer_data
->cmd_sock
< 0 ||
976 consumer_data
->metadata_sock
.fd
< 0) {
977 PERROR("consumer connect cmd socket");
978 /* On error, signal condition and quit. */
979 signal_consumer_condition(consumer_data
, -1);
982 /* Create metadata socket lock. */
983 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
984 if (consumer_data
->metadata_sock
.lock
== NULL
) {
985 PERROR("zmalloc pthread mutex");
989 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
991 signal_consumer_condition(consumer_data
, 1);
992 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
993 DBG("Consumer metadata socket ready (fd: %d)",
994 consumer_data
->metadata_sock
.fd
);
996 ERR("consumer error when waiting for SOCK_READY : %s",
997 lttcomm_get_readable_code(-code
));
1001 /* Remove the consumerd error sock since we've established a connexion */
1002 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1007 /* Add new accepted error socket. */
1008 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1013 /* Add metadata socket that is successfully connected. */
1014 ret
= lttng_poll_add(&events
, consumer_data
->metadata_sock
.fd
,
1015 LPOLLIN
| LPOLLRDHUP
);
1020 health_code_update();
1022 /* Infinite blocking call, waiting for transmission */
1025 health_poll_entry();
1026 ret
= lttng_poll_wait(&events
, -1);
1030 * Restart interrupted system call.
1032 if (errno
== EINTR
) {
1040 for (i
= 0; i
< nb_fd
; i
++) {
1041 /* Fetch once the poll data */
1042 revents
= LTTNG_POLL_GETEV(&events
, i
);
1043 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1045 health_code_update();
1047 /* Thread quit pipe has been closed. Killing thread. */
1048 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1054 if (pollfd
== sock
) {
1055 /* Event on the consumerd socket */
1056 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1057 ERR("consumer err socket second poll error");
1060 health_code_update();
1061 /* Wait for any kconsumerd error */
1062 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1063 sizeof(enum lttcomm_return_code
));
1065 ERR("consumer closed the command socket");
1069 ERR("consumer return code : %s",
1070 lttcomm_get_readable_code(-code
));
1073 } else if (pollfd
== consumer_data
->metadata_sock
.fd
) {
1074 /* UST metadata requests */
1075 ret
= ust_consumer_metadata_request(
1076 &consumer_data
->metadata_sock
);
1078 ERR("Handling metadata request");
1083 ERR("Unknown pollfd");
1087 health_code_update();
1092 /* Immediately set the consumerd state to stopped */
1093 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1094 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1095 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1096 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1097 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1099 /* Code flow error... */
1103 if (consumer_data
->err_sock
>= 0) {
1104 ret
= close(consumer_data
->err_sock
);
1109 if (consumer_data
->cmd_sock
>= 0) {
1110 ret
= close(consumer_data
->cmd_sock
);
1115 if (consumer_data
->metadata_sock
.fd
>= 0) {
1116 ret
= close(consumer_data
->metadata_sock
.fd
);
1121 /* Cleanup metadata socket mutex. */
1122 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1123 free(consumer_data
->metadata_sock
.lock
);
1132 unlink(consumer_data
->err_unix_sock_path
);
1133 unlink(consumer_data
->cmd_unix_sock_path
);
1134 consumer_data
->pid
= 0;
1136 lttng_poll_clean(&events
);
1140 ERR("Health error occurred in %s", __func__
);
1142 health_unregister();
1143 DBG("consumer thread cleanup completed");
1149 * This thread manage application communication.
1151 static void *thread_manage_apps(void *data
)
1153 int i
, ret
, pollfd
, err
= -1;
1154 uint32_t revents
, nb_fd
;
1155 struct lttng_poll_event events
;
1157 DBG("[thread] Manage application started");
1159 rcu_register_thread();
1160 rcu_thread_online();
1162 health_register(HEALTH_TYPE_APP_MANAGE
);
1164 if (testpoint(thread_manage_apps
)) {
1165 goto error_testpoint
;
1168 health_code_update();
1170 ret
= sessiond_set_thread_pollset(&events
, 2);
1172 goto error_poll_create
;
1175 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1180 if (testpoint(thread_manage_apps_before_loop
)) {
1184 health_code_update();
1187 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1189 /* Inifinite blocking call, waiting for transmission */
1191 health_poll_entry();
1192 ret
= lttng_poll_wait(&events
, -1);
1196 * Restart interrupted system call.
1198 if (errno
== EINTR
) {
1206 for (i
= 0; i
< nb_fd
; i
++) {
1207 /* Fetch once the poll data */
1208 revents
= LTTNG_POLL_GETEV(&events
, i
);
1209 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1211 health_code_update();
1213 /* Thread quit pipe has been closed. Killing thread. */
1214 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1220 /* Inspect the apps cmd pipe */
1221 if (pollfd
== apps_cmd_pipe
[0]) {
1222 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1223 ERR("Apps command pipe error");
1225 } else if (revents
& LPOLLIN
) {
1230 ret
= read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1231 } while (ret
< 0 && errno
== EINTR
);
1232 if (ret
< 0 || ret
< sizeof(sock
)) {
1233 PERROR("read apps cmd pipe");
1237 health_code_update();
1240 * We only monitor the error events of the socket. This
1241 * thread does not handle any incoming data from UST
1244 ret
= lttng_poll_add(&events
, sock
,
1245 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1250 /* Set socket timeout for both receiving and ending */
1251 (void) lttcomm_setsockopt_rcv_timeout(sock
,
1252 app_socket_timeout
);
1253 (void) lttcomm_setsockopt_snd_timeout(sock
,
1254 app_socket_timeout
);
1256 DBG("Apps with sock %d added to poll set", sock
);
1258 health_code_update();
1264 * At this point, we know that a registered application made
1265 * the event at poll_wait.
1267 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1268 /* Removing from the poll set */
1269 ret
= lttng_poll_del(&events
, pollfd
);
1274 /* Socket closed on remote end. */
1275 ust_app_unregister(pollfd
);
1280 health_code_update();
1286 lttng_poll_clean(&events
);
1289 utils_close_pipe(apps_cmd_pipe
);
1290 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1293 * We don't clean the UST app hash table here since already registered
1294 * applications can still be controlled so let them be until the session
1295 * daemon dies or the applications stop.
1300 ERR("Health error occurred in %s", __func__
);
1302 health_unregister();
1303 DBG("Application communication apps thread cleanup complete");
1304 rcu_thread_offline();
1305 rcu_unregister_thread();
1310 * Send a socket to a thread This is called from the dispatch UST registration
1311 * thread once all sockets are set for the application.
1313 * On success, return 0 else a negative value being the errno message of the
1316 static int send_socket_to_thread(int fd
, int sock
)
1320 /* Sockets MUST be set or else this should not have been called. */
1325 ret
= write(fd
, &sock
, sizeof(sock
));
1326 } while (ret
< 0 && errno
== EINTR
);
1327 if (ret
< 0 || ret
!= sizeof(sock
)) {
1328 PERROR("write apps pipe %d", fd
);
1335 /* All good. Don't send back the write positive ret value. */
1342 * Sanitize the wait queue of the dispatch registration thread meaning removing
1343 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1344 * notify socket is never received.
1346 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1348 int ret
, nb_fd
= 0, i
;
1349 unsigned int fd_added
= 0;
1350 struct lttng_poll_event events
;
1351 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1355 lttng_poll_init(&events
);
1357 /* Just skip everything for an empty queue. */
1358 if (!wait_queue
->count
) {
1362 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1367 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1368 &wait_queue
->head
, head
) {
1369 assert(wait_node
->app
);
1370 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1371 LPOLLHUP
| LPOLLERR
);
1384 * Poll but don't block so we can quickly identify the faulty events and
1385 * clean them afterwards from the wait queue.
1387 ret
= lttng_poll_wait(&events
, 0);
1393 for (i
= 0; i
< nb_fd
; i
++) {
1394 /* Get faulty FD. */
1395 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1396 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1398 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1399 &wait_queue
->head
, head
) {
1400 if (pollfd
== wait_node
->app
->sock
&&
1401 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1402 cds_list_del(&wait_node
->head
);
1403 wait_queue
->count
--;
1404 ust_app_destroy(wait_node
->app
);
1412 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1416 lttng_poll_clean(&events
);
1420 lttng_poll_clean(&events
);
1422 ERR("Unable to sanitize wait queue");
1427 * Dispatch request from the registration threads to the application
1428 * communication thread.
1430 static void *thread_dispatch_ust_registration(void *data
)
1433 struct cds_wfq_node
*node
;
1434 struct ust_command
*ust_cmd
= NULL
;
1435 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1436 struct ust_reg_wait_queue wait_queue
= {
1440 health_register(HEALTH_TYPE_APP_REG_DISPATCH
);
1442 health_code_update();
1444 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1446 DBG("[thread] Dispatch UST command started");
1448 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1449 health_code_update();
1451 /* Atomically prepare the queue futex */
1452 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1455 struct ust_app
*app
= NULL
;
1459 * Make sure we don't have node(s) that have hung up before receiving
1460 * the notify socket. This is to clean the list in order to avoid
1461 * memory leaks from notify socket that are never seen.
1463 sanitize_wait_queue(&wait_queue
);
1465 health_code_update();
1466 /* Dequeue command for registration */
1467 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1469 DBG("Woken up but nothing in the UST command queue");
1470 /* Continue thread execution */
1474 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1476 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1477 " gid:%d sock:%d name:%s (version %d.%d)",
1478 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1479 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1480 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1481 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1483 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1484 wait_node
= zmalloc(sizeof(*wait_node
));
1486 PERROR("zmalloc wait_node dispatch");
1487 ret
= close(ust_cmd
->sock
);
1489 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1491 lttng_fd_put(1, LTTNG_FD_APPS
);
1495 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1497 /* Create application object if socket is CMD. */
1498 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1500 if (!wait_node
->app
) {
1501 ret
= close(ust_cmd
->sock
);
1503 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1505 lttng_fd_put(1, LTTNG_FD_APPS
);
1511 * Add application to the wait queue so we can set the notify
1512 * socket before putting this object in the global ht.
1514 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1519 * We have to continue here since we don't have the notify
1520 * socket and the application MUST be added to the hash table
1521 * only at that moment.
1526 * Look for the application in the local wait queue and set the
1527 * notify socket if found.
1529 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1530 &wait_queue
.head
, head
) {
1531 health_code_update();
1532 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1533 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1534 cds_list_del(&wait_node
->head
);
1536 app
= wait_node
->app
;
1538 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1544 * With no application at this stage the received socket is
1545 * basically useless so close it before we free the cmd data
1546 * structure for good.
1549 ret
= close(ust_cmd
->sock
);
1551 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1553 lttng_fd_put(1, LTTNG_FD_APPS
);
1560 * @session_lock_list
1562 * Lock the global session list so from the register up to the
1563 * registration done message, no thread can see the application
1564 * and change its state.
1566 session_lock_list();
1570 * Add application to the global hash table. This needs to be
1571 * done before the update to the UST registry can locate the
1576 /* Set app version. This call will print an error if needed. */
1577 (void) ust_app_version(app
);
1579 /* Send notify socket through the notify pipe. */
1580 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1584 session_unlock_list();
1585 /* No notify thread, stop the UST tracing. */
1590 * Update newly registered application with the tracing
1591 * registry info already enabled information.
1593 update_ust_app(app
->sock
);
1596 * Don't care about return value. Let the manage apps threads
1597 * handle app unregistration upon socket close.
1599 (void) ust_app_register_done(app
->sock
);
1602 * Even if the application socket has been closed, send the app
1603 * to the thread and unregistration will take place at that
1606 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1609 session_unlock_list();
1610 /* No apps. thread, stop the UST tracing. */
1615 session_unlock_list();
1617 } while (node
!= NULL
);
1619 health_poll_entry();
1620 /* Futex wait on queue. Blocking call on futex() */
1621 futex_nto1_wait(&ust_cmd_queue
.futex
);
1624 /* Normal exit, no error */
1628 /* Clean up wait queue. */
1629 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1630 &wait_queue
.head
, head
) {
1631 cds_list_del(&wait_node
->head
);
1636 DBG("Dispatch thread dying");
1639 ERR("Health error occurred in %s", __func__
);
1641 health_unregister();
1646 * This thread manage application registration.
1648 static void *thread_registration_apps(void *data
)
1650 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1651 uint32_t revents
, nb_fd
;
1652 struct lttng_poll_event events
;
1654 * Get allocated in this thread, enqueued to a global queue, dequeued and
1655 * freed in the manage apps thread.
1657 struct ust_command
*ust_cmd
= NULL
;
1659 DBG("[thread] Manage application registration started");
1661 health_register(HEALTH_TYPE_APP_REG
);
1663 if (testpoint(thread_registration_apps
)) {
1664 goto error_testpoint
;
1667 ret
= lttcomm_listen_unix_sock(apps_sock
);
1673 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1674 * more will be added to this poll set.
1676 ret
= sessiond_set_thread_pollset(&events
, 2);
1678 goto error_create_poll
;
1681 /* Add the application registration socket */
1682 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1684 goto error_poll_add
;
1687 /* Notify all applications to register */
1688 ret
= notify_ust_apps(1);
1690 ERR("Failed to notify applications or create the wait shared memory.\n"
1691 "Execution continues but there might be problem for already\n"
1692 "running applications that wishes to register.");
1696 DBG("Accepting application registration");
1698 /* Inifinite blocking call, waiting for transmission */
1700 health_poll_entry();
1701 ret
= lttng_poll_wait(&events
, -1);
1705 * Restart interrupted system call.
1707 if (errno
== EINTR
) {
1715 for (i
= 0; i
< nb_fd
; i
++) {
1716 health_code_update();
1718 /* Fetch once the poll data */
1719 revents
= LTTNG_POLL_GETEV(&events
, i
);
1720 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1722 /* Thread quit pipe has been closed. Killing thread. */
1723 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1729 /* Event on the registration socket */
1730 if (pollfd
== apps_sock
) {
1731 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1732 ERR("Register apps socket poll error");
1734 } else if (revents
& LPOLLIN
) {
1735 sock
= lttcomm_accept_unix_sock(apps_sock
);
1741 * Set the CLOEXEC flag. Return code is useless because
1742 * either way, the show must go on.
1744 (void) utils_set_fd_cloexec(sock
);
1746 /* Create UST registration command for enqueuing */
1747 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1748 if (ust_cmd
== NULL
) {
1749 PERROR("ust command zmalloc");
1754 * Using message-based transmissions to ensure we don't
1755 * have to deal with partially received messages.
1757 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1759 ERR("Exhausted file descriptors allowed for applications.");
1769 health_code_update();
1770 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
1773 /* Close socket of the application. */
1778 lttng_fd_put(LTTNG_FD_APPS
, 1);
1782 health_code_update();
1784 ust_cmd
->sock
= sock
;
1787 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1788 " gid:%d sock:%d name:%s (version %d.%d)",
1789 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1790 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1791 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1792 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1795 * Lock free enqueue the registration request. The red pill
1796 * has been taken! This apps will be part of the *system*.
1798 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1801 * Wake the registration queue futex. Implicit memory
1802 * barrier with the exchange in cds_wfq_enqueue.
1804 futex_nto1_wake(&ust_cmd_queue
.futex
);
1814 ERR("Health error occurred in %s", __func__
);
1817 /* Notify that the registration thread is gone */
1820 if (apps_sock
>= 0) {
1821 ret
= close(apps_sock
);
1831 lttng_fd_put(LTTNG_FD_APPS
, 1);
1833 unlink(apps_unix_sock_path
);
1836 lttng_poll_clean(&events
);
1840 DBG("UST Registration thread cleanup complete");
1841 health_unregister();
1847 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1848 * exec or it will fails.
1850 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1853 struct timespec timeout
;
1855 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1856 consumer_data
->consumer_thread_is_ready
= 0;
1858 /* Setup pthread condition */
1859 ret
= pthread_condattr_init(&consumer_data
->condattr
);
1862 PERROR("pthread_condattr_init consumer data");
1867 * Set the monotonic clock in order to make sure we DO NOT jump in time
1868 * between the clock_gettime() call and the timedwait call. See bug #324
1869 * for a more details and how we noticed it.
1871 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
1874 PERROR("pthread_condattr_setclock consumer data");
1878 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
1881 PERROR("pthread_cond_init consumer data");
1885 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
1888 PERROR("pthread_create consumer");
1893 /* We are about to wait on a pthread condition */
1894 pthread_mutex_lock(&consumer_data
->cond_mutex
);
1896 /* Get time for sem_timedwait absolute timeout */
1897 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
1899 * Set the timeout for the condition timed wait even if the clock gettime
1900 * call fails since we might loop on that call and we want to avoid to
1901 * increment the timeout too many times.
1903 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1906 * The following loop COULD be skipped in some conditions so this is why we
1907 * set ret to 0 in order to make sure at least one round of the loop is
1913 * Loop until the condition is reached or when a timeout is reached. Note
1914 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1915 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1916 * possible. This loop does not take any chances and works with both of
1919 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
1920 if (clock_ret
< 0) {
1921 PERROR("clock_gettime spawn consumer");
1922 /* Infinite wait for the consumerd thread to be ready */
1923 ret
= pthread_cond_wait(&consumer_data
->cond
,
1924 &consumer_data
->cond_mutex
);
1926 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
1927 &consumer_data
->cond_mutex
, &timeout
);
1931 /* Release the pthread condition */
1932 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
1936 if (ret
== ETIMEDOUT
) {
1938 * Call has timed out so we kill the kconsumerd_thread and return
1941 ERR("Condition timed out. The consumer thread was never ready."
1943 ret
= pthread_cancel(consumer_data
->thread
);
1945 PERROR("pthread_cancel consumer thread");
1948 PERROR("pthread_cond_wait failed consumer thread");
1953 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1954 if (consumer_data
->pid
== 0) {
1955 ERR("Consumerd did not start");
1956 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1959 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1968 * Join consumer thread
1970 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1974 /* Consumer pid must be a real one. */
1975 if (consumer_data
->pid
> 0) {
1977 ret
= kill(consumer_data
->pid
, SIGTERM
);
1979 ERR("Error killing consumer daemon");
1982 return pthread_join(consumer_data
->thread
, &status
);
1989 * Fork and exec a consumer daemon (consumerd).
1991 * Return pid if successful else -1.
1993 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1997 const char *consumer_to_use
;
1998 const char *verbosity
;
2001 DBG("Spawning consumerd");
2008 if (opt_verbose_consumer
) {
2009 verbosity
= "--verbose";
2011 verbosity
= "--quiet";
2013 switch (consumer_data
->type
) {
2014 case LTTNG_CONSUMER_KERNEL
:
2016 * Find out which consumerd to execute. We will first try the
2017 * 64-bit path, then the sessiond's installation directory, and
2018 * fallback on the 32-bit one,
2020 DBG3("Looking for a kernel consumer at these locations:");
2021 DBG3(" 1) %s", consumerd64_bin
);
2022 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2023 DBG3(" 3) %s", consumerd32_bin
);
2024 if (stat(consumerd64_bin
, &st
) == 0) {
2025 DBG3("Found location #1");
2026 consumer_to_use
= consumerd64_bin
;
2027 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2028 DBG3("Found location #2");
2029 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2030 } else if (stat(consumerd32_bin
, &st
) == 0) {
2031 DBG3("Found location #3");
2032 consumer_to_use
= consumerd32_bin
;
2034 DBG("Could not find any valid consumerd executable");
2037 DBG("Using kernel consumer at: %s", consumer_to_use
);
2038 if (consumer_debug_valgrind
) {
2039 execl("/usr/bin/valgrind",
2040 "valgrind", "--leak-check=full", "--show-reachable=yes",
2041 "--tool=memcheck", "--track-fds=yes",
2042 "--log-file=/tmp/valgrind.kconsumer.log",
2043 consumer_to_use
, verbosity
, "-k",
2044 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2045 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2048 execl(consumer_to_use
, "lttng-consumerd", verbosity
, "-k",
2049 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2050 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2054 case LTTNG_CONSUMER64_UST
:
2056 char *tmpnew
= NULL
;
2058 if (consumerd64_libdir
[0] != '\0') {
2062 tmp
= getenv("LD_LIBRARY_PATH");
2066 tmplen
= strlen("LD_LIBRARY_PATH=")
2067 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2068 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2073 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2074 strcat(tmpnew
, consumerd64_libdir
);
2075 if (tmp
[0] != '\0') {
2076 strcat(tmpnew
, ":");
2077 strcat(tmpnew
, tmp
);
2079 ret
= putenv(tmpnew
);
2086 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2087 if (consumer_debug_valgrind
) {
2088 ret
= execl("/usr/bin/valgrind",
2089 "valgrind", "--leak-check=full", "--show-reachable=yes",
2090 "--tool=memcheck", "--track-fds=yes",
2091 "--log-file=/tmp/valgrind.ust64consumer.log",
2092 consumerd64_bin
, verbosity
, "-u",
2093 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2094 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2097 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2098 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2099 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2102 if (consumerd64_libdir
[0] != '\0') {
2110 case LTTNG_CONSUMER32_UST
:
2112 char *tmpnew
= NULL
;
2114 if (consumerd32_libdir
[0] != '\0') {
2118 tmp
= getenv("LD_LIBRARY_PATH");
2122 tmplen
= strlen("LD_LIBRARY_PATH=")
2123 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2124 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2129 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2130 strcat(tmpnew
, consumerd32_libdir
);
2131 if (tmp
[0] != '\0') {
2132 strcat(tmpnew
, ":");
2133 strcat(tmpnew
, tmp
);
2135 ret
= putenv(tmpnew
);
2142 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2143 if (consumer_debug_valgrind
) {
2144 ret
= execl("/usr/bin/valgrind",
2145 "valgrind", "--leak-check=full", "--show-reachable=yes",
2146 "--tool=memcheck", "--track-fds=yes",
2147 "--log-file=/tmp/valgrind.ust32consumer.log",
2148 consumerd32_bin
, verbosity
, "-u",
2149 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2150 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2153 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2154 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2155 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2158 if (consumerd32_libdir
[0] != '\0') {
2167 PERROR("unknown consumer type");
2171 PERROR("kernel start consumer exec");
2174 } else if (pid
> 0) {
2177 PERROR("start consumer fork");
2185 * Spawn the consumerd daemon and session daemon thread.
2187 static int start_consumerd(struct consumer_data
*consumer_data
)
2192 * Set the listen() state on the socket since there is a possible race
2193 * between the exec() of the consumer daemon and this call if place in the
2194 * consumer thread. See bug #366 for more details.
2196 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2201 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2202 if (consumer_data
->pid
!= 0) {
2203 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2207 ret
= spawn_consumerd(consumer_data
);
2209 ERR("Spawning consumerd failed");
2210 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2214 /* Setting up the consumer_data pid */
2215 consumer_data
->pid
= ret
;
2216 DBG2("Consumer pid %d", consumer_data
->pid
);
2217 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2219 DBG2("Spawning consumer control thread");
2220 ret
= spawn_consumer_thread(consumer_data
);
2222 ERR("Fatal error spawning consumer control thread");
2230 /* Cleanup already created sockets on error. */
2231 if (consumer_data
->err_sock
>= 0) {
2234 err
= close(consumer_data
->err_sock
);
2236 PERROR("close consumer data error socket");
2243 * Compute health status of each consumer. If one of them is zero (bad
2244 * state), we return 0.
2246 static int check_consumer_health(void)
2250 ret
= health_check_state(HEALTH_TYPE_CONSUMER
);
2252 DBG3("Health consumer check %d", ret
);
2258 * Setup necessary data for kernel tracer action.
2260 static int init_kernel_tracer(void)
2264 /* Modprobe lttng kernel modules */
2265 ret
= modprobe_lttng_control();
2270 /* Open debugfs lttng */
2271 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2272 if (kernel_tracer_fd
< 0) {
2273 DBG("Failed to open %s", module_proc_lttng
);
2278 /* Validate kernel version */
2279 ret
= kernel_validate_version(kernel_tracer_fd
);
2284 ret
= modprobe_lttng_data();
2289 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2293 modprobe_remove_lttng_control();
2294 ret
= close(kernel_tracer_fd
);
2298 kernel_tracer_fd
= -1;
2299 return LTTNG_ERR_KERN_VERSION
;
2302 ret
= close(kernel_tracer_fd
);
2308 modprobe_remove_lttng_control();
2311 WARN("No kernel tracer available");
2312 kernel_tracer_fd
= -1;
2314 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2316 return LTTNG_ERR_KERN_NA
;
2322 * Copy consumer output from the tracing session to the domain session. The
2323 * function also applies the right modification on a per domain basis for the
2324 * trace files destination directory.
2326 * Should *NOT* be called with RCU read-side lock held.
2328 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2331 const char *dir_name
;
2332 struct consumer_output
*consumer
;
2335 assert(session
->consumer
);
2338 case LTTNG_DOMAIN_KERNEL
:
2339 DBG3("Copying tracing session consumer output in kernel session");
2341 * XXX: We should audit the session creation and what this function
2342 * does "extra" in order to avoid a destroy since this function is used
2343 * in the domain session creation (kernel and ust) only. Same for UST
2346 if (session
->kernel_session
->consumer
) {
2347 consumer_destroy_output(session
->kernel_session
->consumer
);
2349 session
->kernel_session
->consumer
=
2350 consumer_copy_output(session
->consumer
);
2351 /* Ease our life a bit for the next part */
2352 consumer
= session
->kernel_session
->consumer
;
2353 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2355 case LTTNG_DOMAIN_UST
:
2356 DBG3("Copying tracing session consumer output in UST session");
2357 if (session
->ust_session
->consumer
) {
2358 consumer_destroy_output(session
->ust_session
->consumer
);
2360 session
->ust_session
->consumer
=
2361 consumer_copy_output(session
->consumer
);
2362 /* Ease our life a bit for the next part */
2363 consumer
= session
->ust_session
->consumer
;
2364 dir_name
= DEFAULT_UST_TRACE_DIR
;
2367 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2371 /* Append correct directory to subdir */
2372 strncat(consumer
->subdir
, dir_name
,
2373 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2374 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2383 * Create an UST session and add it to the session ust list.
2385 * Should *NOT* be called with RCU read-side lock held.
2387 static int create_ust_session(struct ltt_session
*session
,
2388 struct lttng_domain
*domain
)
2391 struct ltt_ust_session
*lus
= NULL
;
2395 assert(session
->consumer
);
2397 switch (domain
->type
) {
2398 case LTTNG_DOMAIN_UST
:
2401 ERR("Unknown UST domain on create session %d", domain
->type
);
2402 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2406 DBG("Creating UST session");
2408 lus
= trace_ust_create_session(session
->id
);
2410 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2414 lus
->uid
= session
->uid
;
2415 lus
->gid
= session
->gid
;
2416 lus
->output_traces
= session
->output_traces
;
2417 session
->ust_session
= lus
;
2419 /* Copy session output to the newly created UST session */
2420 ret
= copy_session_consumer(domain
->type
, session
);
2421 if (ret
!= LTTNG_OK
) {
2429 session
->ust_session
= NULL
;
2434 * Create a kernel tracer session then create the default channel.
2436 static int create_kernel_session(struct ltt_session
*session
)
2440 DBG("Creating kernel session");
2442 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2444 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2448 /* Code flow safety */
2449 assert(session
->kernel_session
);
2451 /* Copy session output to the newly created Kernel session */
2452 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2453 if (ret
!= LTTNG_OK
) {
2457 /* Create directory(ies) on local filesystem. */
2458 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2459 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2460 ret
= run_as_mkdir_recursive(
2461 session
->kernel_session
->consumer
->dst
.trace_path
,
2462 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2464 if (ret
!= -EEXIST
) {
2465 ERR("Trace directory creation error");
2471 session
->kernel_session
->uid
= session
->uid
;
2472 session
->kernel_session
->gid
= session
->gid
;
2473 session
->kernel_session
->output_traces
= session
->output_traces
;
2478 trace_kernel_destroy_session(session
->kernel_session
);
2479 session
->kernel_session
= NULL
;
2484 * Count number of session permitted by uid/gid.
2486 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2489 struct ltt_session
*session
;
2491 DBG("Counting number of available session for UID %d GID %d",
2493 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2495 * Only list the sessions the user can control.
2497 if (!session_access_ok(session
, uid
, gid
)) {
2506 * Process the command requested by the lttng client within the command
2507 * context structure. This function make sure that the return structure (llm)
2508 * is set and ready for transmission before returning.
2510 * Return any error encountered or 0 for success.
2512 * "sock" is only used for special-case var. len data.
2514 * Should *NOT* be called with RCU read-side lock held.
2516 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2520 int need_tracing_session
= 1;
2523 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2527 switch (cmd_ctx
->lsm
->cmd_type
) {
2528 case LTTNG_CREATE_SESSION
:
2529 case LTTNG_DESTROY_SESSION
:
2530 case LTTNG_LIST_SESSIONS
:
2531 case LTTNG_LIST_DOMAINS
:
2532 case LTTNG_START_TRACE
:
2533 case LTTNG_STOP_TRACE
:
2534 case LTTNG_DATA_PENDING
:
2535 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2536 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2537 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2538 case LTTNG_SNAPSHOT_RECORD
:
2545 if (opt_no_kernel
&& need_domain
2546 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2548 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2550 ret
= LTTNG_ERR_KERN_NA
;
2555 /* Deny register consumer if we already have a spawned consumer. */
2556 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2557 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2558 if (kconsumer_data
.pid
> 0) {
2559 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2560 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2563 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2567 * Check for command that don't needs to allocate a returned payload. We do
2568 * this here so we don't have to make the call for no payload at each
2571 switch(cmd_ctx
->lsm
->cmd_type
) {
2572 case LTTNG_LIST_SESSIONS
:
2573 case LTTNG_LIST_TRACEPOINTS
:
2574 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2575 case LTTNG_LIST_DOMAINS
:
2576 case LTTNG_LIST_CHANNELS
:
2577 case LTTNG_LIST_EVENTS
:
2580 /* Setup lttng message with no payload */
2581 ret
= setup_lttng_msg(cmd_ctx
, 0);
2583 /* This label does not try to unlock the session */
2584 goto init_setup_error
;
2588 /* Commands that DO NOT need a session. */
2589 switch (cmd_ctx
->lsm
->cmd_type
) {
2590 case LTTNG_CREATE_SESSION
:
2591 case LTTNG_CALIBRATE
:
2592 case LTTNG_LIST_SESSIONS
:
2593 case LTTNG_LIST_TRACEPOINTS
:
2594 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2595 need_tracing_session
= 0;
2598 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2600 * We keep the session list lock across _all_ commands
2601 * for now, because the per-session lock does not
2602 * handle teardown properly.
2604 session_lock_list();
2605 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2606 if (cmd_ctx
->session
== NULL
) {
2607 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2610 /* Acquire lock for the session */
2611 session_lock(cmd_ctx
->session
);
2621 * Check domain type for specific "pre-action".
2623 switch (cmd_ctx
->lsm
->domain
.type
) {
2624 case LTTNG_DOMAIN_KERNEL
:
2626 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2630 /* Kernel tracer check */
2631 if (kernel_tracer_fd
== -1) {
2632 /* Basically, load kernel tracer modules */
2633 ret
= init_kernel_tracer();
2639 /* Consumer is in an ERROR state. Report back to client */
2640 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2641 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2645 /* Need a session for kernel command */
2646 if (need_tracing_session
) {
2647 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2648 ret
= create_kernel_session(cmd_ctx
->session
);
2650 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2655 /* Start the kernel consumer daemon */
2656 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2657 if (kconsumer_data
.pid
== 0 &&
2658 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2659 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2660 ret
= start_consumerd(&kconsumer_data
);
2662 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2665 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2667 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2671 * The consumer was just spawned so we need to add the socket to
2672 * the consumer output of the session if exist.
2674 ret
= consumer_create_socket(&kconsumer_data
,
2675 cmd_ctx
->session
->kernel_session
->consumer
);
2682 case LTTNG_DOMAIN_UST
:
2684 /* Consumer is in an ERROR state. Report back to client */
2685 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2686 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2690 if (need_tracing_session
) {
2691 /* Create UST session if none exist. */
2692 if (cmd_ctx
->session
->ust_session
== NULL
) {
2693 ret
= create_ust_session(cmd_ctx
->session
,
2694 &cmd_ctx
->lsm
->domain
);
2695 if (ret
!= LTTNG_OK
) {
2700 /* Start the UST consumer daemons */
2702 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2703 if (consumerd64_bin
[0] != '\0' &&
2704 ustconsumer64_data
.pid
== 0 &&
2705 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2706 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2707 ret
= start_consumerd(&ustconsumer64_data
);
2709 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2710 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2714 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2715 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2717 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2721 * Setup socket for consumer 64 bit. No need for atomic access
2722 * since it was set above and can ONLY be set in this thread.
2724 ret
= consumer_create_socket(&ustconsumer64_data
,
2725 cmd_ctx
->session
->ust_session
->consumer
);
2731 if (consumerd32_bin
[0] != '\0' &&
2732 ustconsumer32_data
.pid
== 0 &&
2733 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2734 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2735 ret
= start_consumerd(&ustconsumer32_data
);
2737 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2738 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2742 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2743 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2745 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2749 * Setup socket for consumer 64 bit. No need for atomic access
2750 * since it was set above and can ONLY be set in this thread.
2752 ret
= consumer_create_socket(&ustconsumer32_data
,
2753 cmd_ctx
->session
->ust_session
->consumer
);
2765 /* Validate consumer daemon state when start/stop trace command */
2766 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2767 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2768 switch (cmd_ctx
->lsm
->domain
.type
) {
2769 case LTTNG_DOMAIN_UST
:
2770 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2771 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2775 case LTTNG_DOMAIN_KERNEL
:
2776 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2777 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2785 * Check that the UID or GID match that of the tracing session.
2786 * The root user can interact with all sessions.
2788 if (need_tracing_session
) {
2789 if (!session_access_ok(cmd_ctx
->session
,
2790 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2791 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2792 ret
= LTTNG_ERR_EPERM
;
2798 * Send relayd information to consumer as soon as we have a domain and a
2801 if (cmd_ctx
->session
&& need_domain
) {
2803 * Setup relayd if not done yet. If the relayd information was already
2804 * sent to the consumer, this call will gracefully return.
2806 ret
= cmd_setup_relayd(cmd_ctx
->session
);
2807 if (ret
!= LTTNG_OK
) {
2812 /* Process by command type */
2813 switch (cmd_ctx
->lsm
->cmd_type
) {
2814 case LTTNG_ADD_CONTEXT
:
2816 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2817 cmd_ctx
->lsm
->u
.context
.channel_name
,
2818 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2821 case LTTNG_DISABLE_CHANNEL
:
2823 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2824 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2827 case LTTNG_DISABLE_EVENT
:
2829 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2830 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2831 cmd_ctx
->lsm
->u
.disable
.name
);
2834 case LTTNG_DISABLE_ALL_EVENT
:
2836 DBG("Disabling all events");
2838 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2839 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2842 case LTTNG_ENABLE_CHANNEL
:
2844 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2845 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2848 case LTTNG_ENABLE_EVENT
:
2850 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2851 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2852 &cmd_ctx
->lsm
->u
.enable
.event
, NULL
, kernel_poll_pipe
[1]);
2855 case LTTNG_ENABLE_ALL_EVENT
:
2857 DBG("Enabling all events");
2859 ret
= cmd_enable_event_all(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2860 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2861 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
2864 case LTTNG_LIST_TRACEPOINTS
:
2866 struct lttng_event
*events
;
2869 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2870 if (nb_events
< 0) {
2871 /* Return value is a negative lttng_error_code. */
2877 * Setup lttng message with payload size set to the event list size in
2878 * bytes and then copy list into the llm payload.
2880 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2886 /* Copy event list into message payload */
2887 memcpy(cmd_ctx
->llm
->payload
, events
,
2888 sizeof(struct lttng_event
) * nb_events
);
2895 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2897 struct lttng_event_field
*fields
;
2900 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2902 if (nb_fields
< 0) {
2903 /* Return value is a negative lttng_error_code. */
2909 * Setup lttng message with payload size set to the event list size in
2910 * bytes and then copy list into the llm payload.
2912 ret
= setup_lttng_msg(cmd_ctx
,
2913 sizeof(struct lttng_event_field
) * nb_fields
);
2919 /* Copy event list into message payload */
2920 memcpy(cmd_ctx
->llm
->payload
, fields
,
2921 sizeof(struct lttng_event_field
) * nb_fields
);
2928 case LTTNG_SET_CONSUMER_URI
:
2931 struct lttng_uri
*uris
;
2933 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2934 len
= nb_uri
* sizeof(struct lttng_uri
);
2937 ret
= LTTNG_ERR_INVALID
;
2941 uris
= zmalloc(len
);
2943 ret
= LTTNG_ERR_FATAL
;
2947 /* Receive variable len data */
2948 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
2949 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2951 DBG("No URIs received from client... continuing");
2953 ret
= LTTNG_ERR_SESSION_FAIL
;
2958 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
2960 if (ret
!= LTTNG_OK
) {
2966 * XXX: 0 means that this URI should be applied on the session. Should
2967 * be a DOMAIN enuam.
2969 if (cmd_ctx
->lsm
->domain
.type
== 0) {
2970 /* Add the URI for the UST session if a consumer is present. */
2971 if (cmd_ctx
->session
->ust_session
&&
2972 cmd_ctx
->session
->ust_session
->consumer
) {
2973 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
2975 } else if (cmd_ctx
->session
->kernel_session
&&
2976 cmd_ctx
->session
->kernel_session
->consumer
) {
2977 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
2978 cmd_ctx
->session
, nb_uri
, uris
);
2986 case LTTNG_START_TRACE
:
2988 ret
= cmd_start_trace(cmd_ctx
->session
);
2991 case LTTNG_STOP_TRACE
:
2993 ret
= cmd_stop_trace(cmd_ctx
->session
);
2996 case LTTNG_CREATE_SESSION
:
2999 struct lttng_uri
*uris
= NULL
;
3001 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3002 len
= nb_uri
* sizeof(struct lttng_uri
);
3005 uris
= zmalloc(len
);
3007 ret
= LTTNG_ERR_FATAL
;
3011 /* Receive variable len data */
3012 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3013 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3015 DBG("No URIs received from client... continuing");
3017 ret
= LTTNG_ERR_SESSION_FAIL
;
3022 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3023 DBG("Creating session with ONE network URI is a bad call");
3024 ret
= LTTNG_ERR_SESSION_FAIL
;
3030 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3037 case LTTNG_DESTROY_SESSION
:
3039 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3041 /* Set session to NULL so we do not unlock it after free. */
3042 cmd_ctx
->session
= NULL
;
3045 case LTTNG_LIST_DOMAINS
:
3048 struct lttng_domain
*domains
;
3050 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3052 /* Return value is a negative lttng_error_code. */
3057 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3063 /* Copy event list into message payload */
3064 memcpy(cmd_ctx
->llm
->payload
, domains
,
3065 nb_dom
* sizeof(struct lttng_domain
));
3072 case LTTNG_LIST_CHANNELS
:
3075 struct lttng_channel
*channels
;
3077 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3078 cmd_ctx
->session
, &channels
);
3080 /* Return value is a negative lttng_error_code. */
3085 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3091 /* Copy event list into message payload */
3092 memcpy(cmd_ctx
->llm
->payload
, channels
,
3093 nb_chan
* sizeof(struct lttng_channel
));
3100 case LTTNG_LIST_EVENTS
:
3103 struct lttng_event
*events
= NULL
;
3105 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3106 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3108 /* Return value is a negative lttng_error_code. */
3113 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3119 /* Copy event list into message payload */
3120 memcpy(cmd_ctx
->llm
->payload
, events
,
3121 nb_event
* sizeof(struct lttng_event
));
3128 case LTTNG_LIST_SESSIONS
:
3130 unsigned int nr_sessions
;
3132 session_lock_list();
3133 nr_sessions
= lttng_sessions_count(
3134 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3135 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3137 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3139 session_unlock_list();
3143 /* Filled the session array */
3144 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3145 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3146 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3148 session_unlock_list();
3153 case LTTNG_CALIBRATE
:
3155 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3156 &cmd_ctx
->lsm
->u
.calibrate
);
3159 case LTTNG_REGISTER_CONSUMER
:
3161 struct consumer_data
*cdata
;
3163 switch (cmd_ctx
->lsm
->domain
.type
) {
3164 case LTTNG_DOMAIN_KERNEL
:
3165 cdata
= &kconsumer_data
;
3168 ret
= LTTNG_ERR_UND
;
3172 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3173 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3176 case LTTNG_ENABLE_EVENT_WITH_FILTER
:
3178 struct lttng_filter_bytecode
*bytecode
;
3180 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3181 ret
= LTTNG_ERR_FILTER_INVAL
;
3184 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
== 0) {
3185 ret
= LTTNG_ERR_FILTER_INVAL
;
3188 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3190 ret
= LTTNG_ERR_FILTER_NOMEM
;
3193 /* Receive var. len. data */
3194 DBG("Receiving var len data from client ...");
3195 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
3196 cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3198 DBG("Nothing recv() from client var len data... continuing");
3200 ret
= LTTNG_ERR_FILTER_INVAL
;
3204 if (bytecode
->len
+ sizeof(*bytecode
)
3205 != cmd_ctx
->lsm
->u
.enable
.bytecode_len
) {
3207 ret
= LTTNG_ERR_FILTER_INVAL
;
3211 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3212 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3213 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, kernel_poll_pipe
[1]);
3216 case LTTNG_DATA_PENDING
:
3218 ret
= cmd_data_pending(cmd_ctx
->session
);
3221 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3223 struct lttcomm_lttng_output_id reply
;
3225 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3226 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3227 if (ret
!= LTTNG_OK
) {
3231 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3236 /* Copy output list into message payload */
3237 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3241 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3243 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3244 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3247 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3250 struct lttng_snapshot_output
*outputs
= NULL
;
3252 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3253 if (nb_output
< 0) {
3258 ret
= setup_lttng_msg(cmd_ctx
,
3259 nb_output
* sizeof(struct lttng_snapshot_output
));
3266 /* Copy output list into message payload */
3267 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3268 nb_output
* sizeof(struct lttng_snapshot_output
));
3275 case LTTNG_SNAPSHOT_RECORD
:
3277 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3278 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3279 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3283 ret
= LTTNG_ERR_UND
;
3288 if (cmd_ctx
->llm
== NULL
) {
3289 DBG("Missing llm structure. Allocating one.");
3290 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3294 /* Set return code */
3295 cmd_ctx
->llm
->ret_code
= ret
;
3297 if (cmd_ctx
->session
) {
3298 session_unlock(cmd_ctx
->session
);
3300 if (need_tracing_session
) {
3301 session_unlock_list();
3308 * Thread managing health check socket.
3310 static void *thread_manage_health(void *data
)
3312 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3313 uint32_t revents
, nb_fd
;
3314 struct lttng_poll_event events
;
3315 struct lttcomm_health_msg msg
;
3316 struct lttcomm_health_data reply
;
3318 DBG("[thread] Manage health check started");
3320 rcu_register_thread();
3322 /* We might hit an error path before this is created. */
3323 lttng_poll_init(&events
);
3325 /* Create unix socket */
3326 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3328 ERR("Unable to create health check Unix socket");
3334 * Set the CLOEXEC flag. Return code is useless because either way, the
3337 (void) utils_set_fd_cloexec(sock
);
3339 ret
= lttcomm_listen_unix_sock(sock
);
3345 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3346 * more will be added to this poll set.
3348 ret
= sessiond_set_thread_pollset(&events
, 2);
3353 /* Add the application registration socket */
3354 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3360 DBG("Health check ready");
3362 /* Inifinite blocking call, waiting for transmission */
3364 ret
= lttng_poll_wait(&events
, -1);
3367 * Restart interrupted system call.
3369 if (errno
== EINTR
) {
3377 for (i
= 0; i
< nb_fd
; i
++) {
3378 /* Fetch once the poll data */
3379 revents
= LTTNG_POLL_GETEV(&events
, i
);
3380 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3382 /* Thread quit pipe has been closed. Killing thread. */
3383 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3389 /* Event on the registration socket */
3390 if (pollfd
== sock
) {
3391 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3392 ERR("Health socket poll error");
3398 new_sock
= lttcomm_accept_unix_sock(sock
);
3404 * Set the CLOEXEC flag. Return code is useless because either way, the
3407 (void) utils_set_fd_cloexec(new_sock
);
3409 DBG("Receiving data from client for health...");
3410 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3412 DBG("Nothing recv() from client... continuing");
3413 ret
= close(new_sock
);
3421 rcu_thread_online();
3423 switch (msg
.component
) {
3424 case LTTNG_HEALTH_CMD
:
3425 reply
.ret_code
= health_check_state(HEALTH_TYPE_CMD
);
3427 case LTTNG_HEALTH_APP_MANAGE
:
3428 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_MANAGE
);
3430 case LTTNG_HEALTH_APP_REG
:
3431 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_REG
);
3433 case LTTNG_HEALTH_KERNEL
:
3434 reply
.ret_code
= health_check_state(HEALTH_TYPE_KERNEL
);
3436 case LTTNG_HEALTH_CONSUMER
:
3437 reply
.ret_code
= check_consumer_health();
3439 case LTTNG_HEALTH_HT_CLEANUP
:
3440 reply
.ret_code
= health_check_state(HEALTH_TYPE_HT_CLEANUP
);
3442 case LTTNG_HEALTH_APP_MANAGE_NOTIFY
:
3443 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY
);
3445 case LTTNG_HEALTH_APP_REG_DISPATCH
:
3446 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_REG_DISPATCH
);
3448 case LTTNG_HEALTH_ALL
:
3450 health_check_state(HEALTH_TYPE_APP_MANAGE
) &&
3451 health_check_state(HEALTH_TYPE_APP_REG
) &&
3452 health_check_state(HEALTH_TYPE_CMD
) &&
3453 health_check_state(HEALTH_TYPE_KERNEL
) &&
3454 check_consumer_health() &&
3455 health_check_state(HEALTH_TYPE_HT_CLEANUP
) &&
3456 health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY
) &&
3457 health_check_state(HEALTH_TYPE_APP_REG_DISPATCH
);
3460 reply
.ret_code
= LTTNG_ERR_UND
;
3465 * Flip ret value since 0 is a success and 1 indicates a bad health for
3466 * the client where in the sessiond it is the opposite. Again, this is
3467 * just to make things easier for us poor developer which enjoy a lot
3470 if (reply
.ret_code
== 0 || reply
.ret_code
== 1) {
3471 reply
.ret_code
= !reply
.ret_code
;
3474 DBG2("Health check return value %d", reply
.ret_code
);
3476 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3478 ERR("Failed to send health data back to client");
3481 /* End of transmission */
3482 ret
= close(new_sock
);
3492 ERR("Health error occurred in %s", __func__
);
3494 DBG("Health check thread dying");
3495 unlink(health_unix_sock_path
);
3503 lttng_poll_clean(&events
);
3505 rcu_unregister_thread();
3510 * This thread manage all clients request using the unix client socket for
3513 static void *thread_manage_clients(void *data
)
3515 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3517 uint32_t revents
, nb_fd
;
3518 struct command_ctx
*cmd_ctx
= NULL
;
3519 struct lttng_poll_event events
;
3521 DBG("[thread] Manage client started");
3523 rcu_register_thread();
3525 health_register(HEALTH_TYPE_CMD
);
3527 if (testpoint(thread_manage_clients
)) {
3528 goto error_testpoint
;
3531 health_code_update();
3533 ret
= lttcomm_listen_unix_sock(client_sock
);
3539 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3540 * more will be added to this poll set.
3542 ret
= sessiond_set_thread_pollset(&events
, 2);
3544 goto error_create_poll
;
3547 /* Add the application registration socket */
3548 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3554 * Notify parent pid that we are ready to accept command for client side.
3556 if (opt_sig_parent
) {
3557 kill(ppid
, SIGUSR1
);
3560 if (testpoint(thread_manage_clients_before_loop
)) {
3564 health_code_update();
3567 DBG("Accepting client command ...");
3569 /* Inifinite blocking call, waiting for transmission */
3571 health_poll_entry();
3572 ret
= lttng_poll_wait(&events
, -1);
3576 * Restart interrupted system call.
3578 if (errno
== EINTR
) {
3586 for (i
= 0; i
< nb_fd
; i
++) {
3587 /* Fetch once the poll data */
3588 revents
= LTTNG_POLL_GETEV(&events
, i
);
3589 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3591 health_code_update();
3593 /* Thread quit pipe has been closed. Killing thread. */
3594 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3600 /* Event on the registration socket */
3601 if (pollfd
== client_sock
) {
3602 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3603 ERR("Client socket poll error");
3609 DBG("Wait for client response");
3611 health_code_update();
3613 sock
= lttcomm_accept_unix_sock(client_sock
);
3619 * Set the CLOEXEC flag. Return code is useless because either way, the
3622 (void) utils_set_fd_cloexec(sock
);
3624 /* Set socket option for credentials retrieval */
3625 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3630 /* Allocate context command to process the client request */
3631 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3632 if (cmd_ctx
== NULL
) {
3633 PERROR("zmalloc cmd_ctx");
3637 /* Allocate data buffer for reception */
3638 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3639 if (cmd_ctx
->lsm
== NULL
) {
3640 PERROR("zmalloc cmd_ctx->lsm");
3644 cmd_ctx
->llm
= NULL
;
3645 cmd_ctx
->session
= NULL
;
3647 health_code_update();
3650 * Data is received from the lttng client. The struct
3651 * lttcomm_session_msg (lsm) contains the command and data request of
3654 DBG("Receiving data from client ...");
3655 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3656 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3658 DBG("Nothing recv() from client... continuing");
3664 clean_command_ctx(&cmd_ctx
);
3668 health_code_update();
3670 // TODO: Validate cmd_ctx including sanity check for
3671 // security purpose.
3673 rcu_thread_online();
3675 * This function dispatch the work to the kernel or userspace tracer
3676 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3677 * informations for the client. The command context struct contains
3678 * everything this function may needs.
3680 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3681 rcu_thread_offline();
3689 * TODO: Inform client somehow of the fatal error. At
3690 * this point, ret < 0 means that a zmalloc failed
3691 * (ENOMEM). Error detected but still accept
3692 * command, unless a socket error has been
3695 clean_command_ctx(&cmd_ctx
);
3699 health_code_update();
3701 DBG("Sending response (size: %d, retcode: %s)",
3702 cmd_ctx
->lttng_msg_size
,
3703 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3704 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3706 ERR("Failed to send data back to client");
3709 /* End of transmission */
3716 clean_command_ctx(&cmd_ctx
);
3718 health_code_update();
3730 lttng_poll_clean(&events
);
3731 clean_command_ctx(&cmd_ctx
);
3736 unlink(client_unix_sock_path
);
3737 if (client_sock
>= 0) {
3738 ret
= close(client_sock
);
3746 ERR("Health error occurred in %s", __func__
);
3749 health_unregister();
3751 DBG("Client thread dying");
3753 rcu_unregister_thread();
3759 * usage function on stderr
3761 static void usage(void)
3763 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3764 fprintf(stderr
, " -h, --help Display this usage.\n");
3765 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3766 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3767 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3768 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3769 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3770 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3771 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3772 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3773 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3774 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3775 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3776 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3777 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3778 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3779 fprintf(stderr
, " -V, --version Show version number.\n");
3780 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3781 fprintf(stderr
, " -q, --quiet No output at all.\n");
3782 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3783 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3784 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3785 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3789 * daemon argument parsing
3791 static int parse_args(int argc
, char **argv
)
3795 static struct option long_options
[] = {
3796 { "client-sock", 1, 0, 'c' },
3797 { "apps-sock", 1, 0, 'a' },
3798 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3799 { "kconsumerd-err-sock", 1, 0, 'E' },
3800 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3801 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3802 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3803 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3804 { "consumerd32-path", 1, 0, 'u' },
3805 { "consumerd32-libdir", 1, 0, 'U' },
3806 { "consumerd64-path", 1, 0, 't' },
3807 { "consumerd64-libdir", 1, 0, 'T' },
3808 { "daemonize", 0, 0, 'd' },
3809 { "sig-parent", 0, 0, 'S' },
3810 { "help", 0, 0, 'h' },
3811 { "group", 1, 0, 'g' },
3812 { "version", 0, 0, 'V' },
3813 { "quiet", 0, 0, 'q' },
3814 { "verbose", 0, 0, 'v' },
3815 { "verbose-consumer", 0, 0, 'Z' },
3816 { "no-kernel", 0, 0, 'N' },
3817 { "pidfile", 1, 0, 'p' },
3822 int option_index
= 0;
3823 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3824 long_options
, &option_index
);
3831 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3833 fprintf(stderr
, " with arg %s\n", optarg
);
3837 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3840 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3846 opt_tracing_group
= optarg
;
3852 fprintf(stdout
, "%s\n", VERSION
);
3858 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3861 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3864 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3867 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3870 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3873 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3879 lttng_opt_quiet
= 1;
3882 /* Verbose level can increase using multiple -v */
3883 lttng_opt_verbose
+= 1;
3886 opt_verbose_consumer
+= 1;
3889 consumerd32_bin
= optarg
;
3892 consumerd32_libdir
= optarg
;
3895 consumerd64_bin
= optarg
;
3898 consumerd64_libdir
= optarg
;
3901 opt_pidfile
= optarg
;
3904 /* Unknown option or other error.
3905 * Error is printed by getopt, just return */
3914 * Creates the two needed socket by the daemon.
3915 * apps_sock - The communication socket for all UST apps.
3916 * client_sock - The communication of the cli tool (lttng).
3918 static int init_daemon_socket(void)
3923 old_umask
= umask(0);
3925 /* Create client tool unix socket */
3926 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3927 if (client_sock
< 0) {
3928 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3933 /* Set the cloexec flag */
3934 ret
= utils_set_fd_cloexec(client_sock
);
3936 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
3937 "Continuing but note that the consumer daemon will have a "
3938 "reference to this socket on exec()", client_sock
);
3941 /* File permission MUST be 660 */
3942 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3944 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3949 /* Create the application unix socket */
3950 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3951 if (apps_sock
< 0) {
3952 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3957 /* Set the cloexec flag */
3958 ret
= utils_set_fd_cloexec(apps_sock
);
3960 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
3961 "Continuing but note that the consumer daemon will have a "
3962 "reference to this socket on exec()", apps_sock
);
3965 /* File permission MUST be 666 */
3966 ret
= chmod(apps_unix_sock_path
,
3967 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3969 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3974 DBG3("Session daemon client socket %d and application socket %d created",
3975 client_sock
, apps_sock
);
3983 * Check if the global socket is available, and if a daemon is answering at the
3984 * other side. If yes, error is returned.
3986 static int check_existing_daemon(void)
3988 /* Is there anybody out there ? */
3989 if (lttng_session_daemon_alive()) {
3997 * Set the tracing group gid onto the client socket.
3999 * Race window between mkdir and chown is OK because we are going from more
4000 * permissive (root.root) to less permissive (root.tracing).
4002 static int set_permissions(char *rundir
)
4007 ret
= allowed_group();
4009 WARN("No tracing group detected");
4016 /* Set lttng run dir */
4017 ret
= chown(rundir
, 0, gid
);
4019 ERR("Unable to set group on %s", rundir
);
4023 /* Ensure tracing group can search the run dir */
4024 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4026 ERR("Unable to set permissions on %s", rundir
);
4030 /* lttng client socket path */
4031 ret
= chown(client_unix_sock_path
, 0, gid
);
4033 ERR("Unable to set group on %s", client_unix_sock_path
);
4037 /* kconsumer error socket path */
4038 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4040 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4044 /* 64-bit ustconsumer error socket path */
4045 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4047 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4051 /* 32-bit ustconsumer compat32 error socket path */
4052 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4054 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4058 DBG("All permissions are set");
4065 * Create the lttng run directory needed for all global sockets and pipe.
4067 static int create_lttng_rundir(const char *rundir
)
4071 DBG3("Creating LTTng run directory: %s", rundir
);
4073 ret
= mkdir(rundir
, S_IRWXU
);
4075 if (errno
!= EEXIST
) {
4076 ERR("Unable to create %s", rundir
);
4088 * Setup sockets and directory needed by the kconsumerd communication with the
4091 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4095 char path
[PATH_MAX
];
4097 switch (consumer_data
->type
) {
4098 case LTTNG_CONSUMER_KERNEL
:
4099 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4101 case LTTNG_CONSUMER64_UST
:
4102 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4104 case LTTNG_CONSUMER32_UST
:
4105 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4108 ERR("Consumer type unknown");
4113 DBG2("Creating consumer directory: %s", path
);
4115 ret
= mkdir(path
, S_IRWXU
);
4117 if (errno
!= EEXIST
) {
4119 ERR("Failed to create %s", path
);
4125 /* Create the kconsumerd error unix socket */
4126 consumer_data
->err_sock
=
4127 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4128 if (consumer_data
->err_sock
< 0) {
4129 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4134 /* File permission MUST be 660 */
4135 ret
= chmod(consumer_data
->err_unix_sock_path
,
4136 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4138 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4148 * Signal handler for the daemon
4150 * Simply stop all worker threads, leaving main() return gracefully after
4151 * joining all threads and calling cleanup().
4153 static void sighandler(int sig
)
4157 DBG("SIGPIPE caught");
4160 DBG("SIGINT caught");
4164 DBG("SIGTERM caught");
4173 * Setup signal handler for :
4174 * SIGINT, SIGTERM, SIGPIPE
4176 static int set_signal_handler(void)
4179 struct sigaction sa
;
4182 if ((ret
= sigemptyset(&sigset
)) < 0) {
4183 PERROR("sigemptyset");
4187 sa
.sa_handler
= sighandler
;
4188 sa
.sa_mask
= sigset
;
4190 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4191 PERROR("sigaction");
4195 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4196 PERROR("sigaction");
4200 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4201 PERROR("sigaction");
4205 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4211 * Set open files limit to unlimited. This daemon can open a large number of
4212 * file descriptors in order to consumer multiple kernel traces.
4214 static void set_ulimit(void)
4219 /* The kernel does not allowed an infinite limit for open files */
4220 lim
.rlim_cur
= 65535;
4221 lim
.rlim_max
= 65535;
4223 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4225 PERROR("failed to set open files limit");
4230 * Write pidfile using the rundir and opt_pidfile.
4232 static void write_pidfile(void)
4235 char pidfile_path
[PATH_MAX
];
4240 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
4242 /* Build pidfile path from rundir and opt_pidfile. */
4243 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
4244 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
4246 PERROR("snprintf pidfile path");
4252 * Create pid file in rundir. Return value is of no importance. The
4253 * execution will continue even though we are not able to write the file.
4255 (void) utils_create_pid_file(getpid(), pidfile_path
);
4264 int main(int argc
, char **argv
)
4268 const char *home_path
, *env_app_timeout
;
4270 init_kernel_workarounds();
4272 rcu_register_thread();
4274 setup_consumerd_path();
4276 page_size
= sysconf(_SC_PAGESIZE
);
4277 if (page_size
< 0) {
4278 PERROR("sysconf _SC_PAGESIZE");
4279 page_size
= LONG_MAX
;
4280 WARN("Fallback page size to %ld", page_size
);
4283 /* Parse arguments */
4285 if ((ret
= parse_args(argc
, argv
)) < 0) {
4295 * child: setsid, close FD 0, 1, 2, chdir /
4296 * parent: exit (if fork is successful)
4304 * We are in the child. Make sure all other file
4305 * descriptors are closed, in case we are called with
4306 * more opened file descriptors than the standard ones.
4308 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
4313 /* Valgrind env. variable setup. */
4314 if (getenv(DEFAULT_CONSUMER_DEBUG_VALGRIND_ENV
)) {
4315 consumer_debug_valgrind
= 1;
4316 /* Valgrind does not support clone(). */
4317 setenv("LTTNG_DEBUG_NOCLONE", "1", 1);
4320 /* Create thread quit pipe */
4321 if ((ret
= init_thread_quit_pipe()) < 0) {
4325 /* Check if daemon is UID = 0 */
4326 is_root
= !getuid();
4329 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4331 /* Create global run dir with root access */
4332 ret
= create_lttng_rundir(rundir
);
4337 if (strlen(apps_unix_sock_path
) == 0) {
4338 snprintf(apps_unix_sock_path
, PATH_MAX
,
4339 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4342 if (strlen(client_unix_sock_path
) == 0) {
4343 snprintf(client_unix_sock_path
, PATH_MAX
,
4344 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4347 /* Set global SHM for ust */
4348 if (strlen(wait_shm_path
) == 0) {
4349 snprintf(wait_shm_path
, PATH_MAX
,
4350 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4353 if (strlen(health_unix_sock_path
) == 0) {
4354 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4355 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
4358 /* Setup kernel consumerd path */
4359 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4360 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4361 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4362 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4364 DBG2("Kernel consumer err path: %s",
4365 kconsumer_data
.err_unix_sock_path
);
4366 DBG2("Kernel consumer cmd path: %s",
4367 kconsumer_data
.cmd_unix_sock_path
);
4369 home_path
= utils_get_home_dir();
4370 if (home_path
== NULL
) {
4371 /* TODO: Add --socket PATH option */
4372 ERR("Can't get HOME directory for sockets creation.");
4378 * Create rundir from home path. This will create something like
4381 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4387 ret
= create_lttng_rundir(rundir
);
4392 if (strlen(apps_unix_sock_path
) == 0) {
4393 snprintf(apps_unix_sock_path
, PATH_MAX
,
4394 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4397 /* Set the cli tool unix socket path */
4398 if (strlen(client_unix_sock_path
) == 0) {
4399 snprintf(client_unix_sock_path
, PATH_MAX
,
4400 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4403 /* Set global SHM for ust */
4404 if (strlen(wait_shm_path
) == 0) {
4405 snprintf(wait_shm_path
, PATH_MAX
,
4406 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
4409 /* Set health check Unix path */
4410 if (strlen(health_unix_sock_path
) == 0) {
4411 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4412 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4416 /* Set consumer initial state */
4417 kernel_consumerd_state
= CONSUMER_STOPPED
;
4418 ust_consumerd_state
= CONSUMER_STOPPED
;
4420 DBG("Client socket path %s", client_unix_sock_path
);
4421 DBG("Application socket path %s", apps_unix_sock_path
);
4422 DBG("Application wait path %s", wait_shm_path
);
4423 DBG("LTTng run directory path: %s", rundir
);
4425 /* 32 bits consumerd path setup */
4426 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4427 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4428 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4429 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4431 DBG2("UST consumer 32 bits err path: %s",
4432 ustconsumer32_data
.err_unix_sock_path
);
4433 DBG2("UST consumer 32 bits cmd path: %s",
4434 ustconsumer32_data
.cmd_unix_sock_path
);
4436 /* 64 bits consumerd path setup */
4437 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4438 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4439 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4440 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4442 DBG2("UST consumer 64 bits err path: %s",
4443 ustconsumer64_data
.err_unix_sock_path
);
4444 DBG2("UST consumer 64 bits cmd path: %s",
4445 ustconsumer64_data
.cmd_unix_sock_path
);
4448 * See if daemon already exist.
4450 if ((ret
= check_existing_daemon()) < 0) {
4451 ERR("Already running daemon.\n");
4453 * We do not goto exit because we must not cleanup()
4454 * because a daemon is already running.
4460 * Init UST app hash table. Alloc hash table before this point since
4461 * cleanup() can get called after that point.
4465 /* After this point, we can safely call cleanup() with "goto exit" */
4468 * These actions must be executed as root. We do that *after* setting up
4469 * the sockets path because we MUST make the check for another daemon using
4470 * those paths *before* trying to set the kernel consumer sockets and init
4474 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4479 /* Setup kernel tracer */
4480 if (!opt_no_kernel
) {
4481 init_kernel_tracer();
4484 /* Set ulimit for open files */
4487 /* init lttng_fd tracking must be done after set_ulimit. */
4490 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4495 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4500 if ((ret
= set_signal_handler()) < 0) {
4504 /* Setup the needed unix socket */
4505 if ((ret
= init_daemon_socket()) < 0) {
4509 /* Set credentials to socket */
4510 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4514 /* Get parent pid if -S, --sig-parent is specified. */
4515 if (opt_sig_parent
) {
4519 /* Setup the kernel pipe for waking up the kernel thread */
4520 if (is_root
&& !opt_no_kernel
) {
4521 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4526 /* Setup the thread ht_cleanup communication pipe. */
4527 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
4531 /* Setup the thread apps communication pipe. */
4532 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4536 /* Setup the thread apps notify communication pipe. */
4537 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
4541 /* Initialize global buffer per UID and PID registry. */
4542 buffer_reg_init_uid_registry();
4543 buffer_reg_init_pid_registry();
4545 /* Init UST command queue. */
4546 cds_wfq_init(&ust_cmd_queue
.queue
);
4549 * Get session list pointer. This pointer MUST NOT be free(). This list is
4550 * statically declared in session.c
4552 session_list_ptr
= session_get_list();
4554 /* Set up max poll set size */
4555 lttng_poll_set_max_size();
4559 /* Check for the application socket timeout env variable. */
4560 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4561 if (env_app_timeout
) {
4562 app_socket_timeout
= atoi(env_app_timeout
);
4564 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4569 /* Create thread to manage the client socket */
4570 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
4571 thread_ht_cleanup
, (void *) NULL
);
4573 PERROR("pthread_create ht_cleanup");
4574 goto exit_ht_cleanup
;
4577 /* Create thread to manage the client socket */
4578 ret
= pthread_create(&health_thread
, NULL
,
4579 thread_manage_health
, (void *) NULL
);
4581 PERROR("pthread_create health");
4585 /* Create thread to manage the client socket */
4586 ret
= pthread_create(&client_thread
, NULL
,
4587 thread_manage_clients
, (void *) NULL
);
4589 PERROR("pthread_create clients");
4593 /* Create thread to dispatch registration */
4594 ret
= pthread_create(&dispatch_thread
, NULL
,
4595 thread_dispatch_ust_registration
, (void *) NULL
);
4597 PERROR("pthread_create dispatch");
4601 /* Create thread to manage application registration. */
4602 ret
= pthread_create(®_apps_thread
, NULL
,
4603 thread_registration_apps
, (void *) NULL
);
4605 PERROR("pthread_create registration");
4609 /* Create thread to manage application socket */
4610 ret
= pthread_create(&apps_thread
, NULL
,
4611 thread_manage_apps
, (void *) NULL
);
4613 PERROR("pthread_create apps");
4617 /* Create thread to manage application notify socket */
4618 ret
= pthread_create(&apps_notify_thread
, NULL
,
4619 ust_thread_manage_notify
, (void *) NULL
);
4621 PERROR("pthread_create apps");
4625 /* Don't start this thread if kernel tracing is not requested nor root */
4626 if (is_root
&& !opt_no_kernel
) {
4627 /* Create kernel thread to manage kernel event */
4628 ret
= pthread_create(&kernel_thread
, NULL
,
4629 thread_manage_kernel
, (void *) NULL
);
4631 PERROR("pthread_create kernel");
4635 ret
= pthread_join(kernel_thread
, &status
);
4637 PERROR("pthread_join");
4638 goto error
; /* join error, exit without cleanup */
4643 ret
= pthread_join(apps_thread
, &status
);
4645 PERROR("pthread_join");
4646 goto error
; /* join error, exit without cleanup */
4650 ret
= pthread_join(reg_apps_thread
, &status
);
4652 PERROR("pthread_join");
4653 goto error
; /* join error, exit without cleanup */
4657 ret
= pthread_join(dispatch_thread
, &status
);
4659 PERROR("pthread_join");
4660 goto error
; /* join error, exit without cleanup */
4664 ret
= pthread_join(client_thread
, &status
);
4666 PERROR("pthread_join");
4667 goto error
; /* join error, exit without cleanup */
4670 ret
= join_consumer_thread(&kconsumer_data
);
4672 PERROR("join_consumer");
4673 goto error
; /* join error, exit without cleanup */
4676 ret
= join_consumer_thread(&ustconsumer32_data
);
4678 PERROR("join_consumer ust32");
4679 goto error
; /* join error, exit without cleanup */
4682 ret
= join_consumer_thread(&ustconsumer64_data
);
4684 PERROR("join_consumer ust64");
4685 goto error
; /* join error, exit without cleanup */
4689 ret
= pthread_join(health_thread
, &status
);
4691 PERROR("pthread_join health thread");
4692 goto error
; /* join error, exit without cleanup */
4696 ret
= pthread_join(ht_cleanup_thread
, &status
);
4698 PERROR("pthread_join ht cleanup thread");
4699 goto error
; /* join error, exit without cleanup */
4704 * cleanup() is called when no other thread is running.
4706 rcu_thread_online();
4708 rcu_thread_offline();
4709 rcu_unregister_thread();