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. */
240 void setup_consumerd_path(void)
242 const char *bin
, *libdir
;
245 * Allow INSTALL_BIN_PATH to be used as a target path for the
246 * native architecture size consumer if CONFIG_CONSUMER*_PATH
247 * has not been defined.
249 #if (CAA_BITS_PER_LONG == 32)
250 if (!consumerd32_bin
[0]) {
251 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
253 if (!consumerd32_libdir
[0]) {
254 consumerd32_libdir
= INSTALL_LIB_PATH
;
256 #elif (CAA_BITS_PER_LONG == 64)
257 if (!consumerd64_bin
[0]) {
258 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
260 if (!consumerd64_libdir
[0]) {
261 consumerd64_libdir
= INSTALL_LIB_PATH
;
264 #error "Unknown bitness"
268 * runtime env. var. overrides the build default.
270 bin
= getenv("LTTNG_CONSUMERD32_BIN");
272 consumerd32_bin
= bin
;
274 bin
= getenv("LTTNG_CONSUMERD64_BIN");
276 consumerd64_bin
= bin
;
278 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
280 consumerd32_libdir
= libdir
;
282 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
284 consumerd64_libdir
= libdir
;
289 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
291 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
297 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
303 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
315 * Check if the thread quit pipe was triggered.
317 * Return 1 if it was triggered else 0;
319 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
321 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
329 * Return group ID of the tracing group or -1 if not found.
331 static gid_t
allowed_group(void)
335 if (opt_tracing_group
) {
336 grp
= getgrnam(opt_tracing_group
);
338 grp
= getgrnam(default_tracing_group
);
348 * Init thread quit pipe.
350 * Return -1 on error or 0 if all pipes are created.
352 static int init_thread_quit_pipe(void)
356 ret
= pipe(thread_quit_pipe
);
358 PERROR("thread quit pipe");
362 for (i
= 0; i
< 2; i
++) {
363 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
375 * Stop all threads by closing the thread quit pipe.
377 static void stop_threads(void)
381 /* Stopping all threads */
382 DBG("Terminating all threads");
383 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
385 ERR("write error on thread quit pipe");
388 /* Dispatch thread */
389 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
390 futex_nto1_wake(&ust_cmd_queue
.futex
);
394 * Close every consumer sockets.
396 static void close_consumer_sockets(void)
400 if (kconsumer_data
.err_sock
>= 0) {
401 ret
= close(kconsumer_data
.err_sock
);
403 PERROR("kernel consumer err_sock close");
406 if (ustconsumer32_data
.err_sock
>= 0) {
407 ret
= close(ustconsumer32_data
.err_sock
);
409 PERROR("UST consumer32 err_sock close");
412 if (ustconsumer64_data
.err_sock
>= 0) {
413 ret
= close(ustconsumer64_data
.err_sock
);
415 PERROR("UST consumer64 err_sock close");
418 if (kconsumer_data
.cmd_sock
>= 0) {
419 ret
= close(kconsumer_data
.cmd_sock
);
421 PERROR("kernel consumer cmd_sock close");
424 if (ustconsumer32_data
.cmd_sock
>= 0) {
425 ret
= close(ustconsumer32_data
.cmd_sock
);
427 PERROR("UST consumer32 cmd_sock close");
430 if (ustconsumer64_data
.cmd_sock
>= 0) {
431 ret
= close(ustconsumer64_data
.cmd_sock
);
433 PERROR("UST consumer64 cmd_sock close");
441 static void cleanup(void)
445 struct ltt_session
*sess
, *stmp
;
449 /* First thing first, stop all threads */
450 utils_close_pipe(thread_quit_pipe
);
453 * If opt_pidfile is undefined, the default file will be wiped when
454 * removing the rundir.
457 ret
= remove(opt_pidfile
);
459 PERROR("remove pidfile %s", opt_pidfile
);
463 DBG("Removing %s directory", rundir
);
464 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
466 ERR("asprintf failed. Something is really wrong!");
469 /* Remove lttng run directory */
472 ERR("Unable to clean %s", rundir
);
477 DBG("Cleaning up all sessions");
479 /* Destroy session list mutex */
480 if (session_list_ptr
!= NULL
) {
481 pthread_mutex_destroy(&session_list_ptr
->lock
);
483 /* Cleanup ALL session */
484 cds_list_for_each_entry_safe(sess
, stmp
,
485 &session_list_ptr
->head
, list
) {
486 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
490 DBG("Closing all UST sockets");
491 ust_app_clean_list();
492 buffer_reg_destroy_registries();
494 if (is_root
&& !opt_no_kernel
) {
495 DBG2("Closing kernel fd");
496 if (kernel_tracer_fd
>= 0) {
497 ret
= close(kernel_tracer_fd
);
502 DBG("Unloading kernel modules");
503 modprobe_remove_lttng_all();
506 close_consumer_sockets();
509 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
510 "Matthew, BEET driven development works!%c[%dm",
511 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
516 * Send data on a unix socket using the liblttsessiondcomm API.
518 * Return lttcomm error code.
520 static int send_unix_sock(int sock
, void *buf
, size_t len
)
522 /* Check valid length */
527 return lttcomm_send_unix_sock(sock
, buf
, len
);
531 * Free memory of a command context structure.
533 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
535 DBG("Clean command context structure");
537 if ((*cmd_ctx
)->llm
) {
538 free((*cmd_ctx
)->llm
);
540 if ((*cmd_ctx
)->lsm
) {
541 free((*cmd_ctx
)->lsm
);
549 * Notify UST applications using the shm mmap futex.
551 static int notify_ust_apps(int active
)
555 DBG("Notifying applications of session daemon state: %d", active
);
557 /* See shm.c for this call implying mmap, shm and futex calls */
558 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
559 if (wait_shm_mmap
== NULL
) {
563 /* Wake waiting process */
564 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
566 /* Apps notified successfully */
574 * Setup the outgoing data buffer for the response (llm) by allocating the
575 * right amount of memory and copying the original information from the lsm
578 * Return total size of the buffer pointed by buf.
580 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
586 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
587 if (cmd_ctx
->llm
== NULL
) {
593 /* Copy common data */
594 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
595 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
597 cmd_ctx
->llm
->data_size
= size
;
598 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
607 * Update the kernel poll set of all channel fd available over all tracing
608 * session. Add the wakeup pipe at the end of the set.
610 static int update_kernel_poll(struct lttng_poll_event
*events
)
613 struct ltt_session
*session
;
614 struct ltt_kernel_channel
*channel
;
616 DBG("Updating kernel poll set");
619 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
620 session_lock(session
);
621 if (session
->kernel_session
== NULL
) {
622 session_unlock(session
);
626 cds_list_for_each_entry(channel
,
627 &session
->kernel_session
->channel_list
.head
, list
) {
628 /* Add channel fd to the kernel poll set */
629 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
631 session_unlock(session
);
634 DBG("Channel fd %d added to kernel set", channel
->fd
);
636 session_unlock(session
);
638 session_unlock_list();
643 session_unlock_list();
648 * Find the channel fd from 'fd' over all tracing session. When found, check
649 * for new channel stream and send those stream fds to the kernel consumer.
651 * Useful for CPU hotplug feature.
653 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
656 struct ltt_session
*session
;
657 struct ltt_kernel_session
*ksess
;
658 struct ltt_kernel_channel
*channel
;
660 DBG("Updating kernel streams for channel fd %d", fd
);
663 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
664 session_lock(session
);
665 if (session
->kernel_session
== NULL
) {
666 session_unlock(session
);
669 ksess
= session
->kernel_session
;
671 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
672 if (channel
->fd
== fd
) {
673 DBG("Channel found, updating kernel streams");
674 ret
= kernel_open_channel_stream(channel
);
680 * Have we already sent fds to the consumer? If yes, it means
681 * that tracing is started so it is safe to send our updated
684 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
685 struct lttng_ht_iter iter
;
686 struct consumer_socket
*socket
;
689 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
690 &iter
.iter
, socket
, node
.node
) {
691 /* Code flow error */
692 assert(socket
->fd
>= 0);
694 pthread_mutex_lock(socket
->lock
);
695 ret
= kernel_consumer_send_channel_stream(socket
,
697 session
->output_traces
? 1 : 0);
698 pthread_mutex_unlock(socket
->lock
);
709 session_unlock(session
);
711 session_unlock_list();
715 session_unlock(session
);
716 session_unlock_list();
721 * For each tracing session, update newly registered apps. The session list
722 * lock MUST be acquired before calling this.
724 static void update_ust_app(int app_sock
)
726 struct ltt_session
*sess
, *stmp
;
728 /* For all tracing session(s) */
729 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
731 if (sess
->ust_session
) {
732 ust_app_global_update(sess
->ust_session
, app_sock
);
734 session_unlock(sess
);
739 * This thread manage event coming from the kernel.
741 * Features supported in this thread:
744 static void *thread_manage_kernel(void *data
)
746 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
747 uint32_t revents
, nb_fd
;
749 struct lttng_poll_event events
;
751 DBG("[thread] Thread manage kernel started");
753 health_register(HEALTH_TYPE_KERNEL
);
756 * This first step of the while is to clean this structure which could free
757 * non NULL pointers so initialize it before the loop.
759 lttng_poll_init(&events
);
761 if (testpoint(thread_manage_kernel
)) {
762 goto error_testpoint
;
765 health_code_update();
767 if (testpoint(thread_manage_kernel_before_loop
)) {
768 goto error_testpoint
;
772 health_code_update();
774 if (update_poll_flag
== 1) {
775 /* Clean events object. We are about to populate it again. */
776 lttng_poll_clean(&events
);
778 ret
= sessiond_set_thread_pollset(&events
, 2);
780 goto error_poll_create
;
783 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
788 /* This will add the available kernel channel if any. */
789 ret
= update_kernel_poll(&events
);
793 update_poll_flag
= 0;
796 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
798 /* Poll infinite value of time */
801 ret
= lttng_poll_wait(&events
, -1);
805 * Restart interrupted system call.
807 if (errno
== EINTR
) {
811 } else if (ret
== 0) {
812 /* Should not happen since timeout is infinite */
813 ERR("Return value of poll is 0 with an infinite timeout.\n"
814 "This should not have happened! Continuing...");
820 for (i
= 0; i
< nb_fd
; i
++) {
821 /* Fetch once the poll data */
822 revents
= LTTNG_POLL_GETEV(&events
, i
);
823 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
825 health_code_update();
827 /* Thread quit pipe has been closed. Killing thread. */
828 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
834 /* Check for data on kernel pipe */
835 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
837 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
838 } while (ret
< 0 && errno
== EINTR
);
840 * Ret value is useless here, if this pipe gets any actions an
841 * update is required anyway.
843 update_poll_flag
= 1;
847 * New CPU detected by the kernel. Adding kernel stream to
848 * kernel session and updating the kernel consumer
850 if (revents
& LPOLLIN
) {
851 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
857 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
858 * and unregister kernel stream at this point.
867 lttng_poll_clean(&events
);
870 utils_close_pipe(kernel_poll_pipe
);
871 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
874 ERR("Health error occurred in %s", __func__
);
875 WARN("Kernel thread died unexpectedly. "
876 "Kernel tracing can continue but CPU hotplug is disabled.");
879 DBG("Kernel thread dying");
884 * Signal pthread condition of the consumer data that the thread.
886 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
888 pthread_mutex_lock(&data
->cond_mutex
);
891 * The state is set before signaling. It can be any value, it's the waiter
892 * job to correctly interpret this condition variable associated to the
893 * consumer pthread_cond.
895 * A value of 0 means that the corresponding thread of the consumer data
896 * was not started. 1 indicates that the thread has started and is ready
897 * for action. A negative value means that there was an error during the
900 data
->consumer_thread_is_ready
= state
;
901 (void) pthread_cond_signal(&data
->cond
);
903 pthread_mutex_unlock(&data
->cond_mutex
);
907 * This thread manage the consumer error sent back to the session daemon.
909 static void *thread_manage_consumer(void *data
)
911 int sock
= -1, i
, ret
, pollfd
, err
= -1;
912 uint32_t revents
, nb_fd
;
913 enum lttcomm_return_code code
;
914 struct lttng_poll_event events
;
915 struct consumer_data
*consumer_data
= data
;
917 DBG("[thread] Manage consumer started");
919 health_register(HEALTH_TYPE_CONSUMER
);
921 health_code_update();
924 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
925 * metadata_sock. Nothing more will be added to this poll set.
927 ret
= sessiond_set_thread_pollset(&events
, 3);
933 * The error socket here is already in a listening state which was done
934 * just before spawning this thread to avoid a race between the consumer
935 * daemon exec trying to connect and the listen() call.
937 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
942 health_code_update();
944 /* Infinite blocking call, waiting for transmission */
948 if (testpoint(thread_manage_consumer
)) {
952 ret
= lttng_poll_wait(&events
, -1);
956 * Restart interrupted system call.
958 if (errno
== EINTR
) {
966 for (i
= 0; i
< nb_fd
; i
++) {
967 /* Fetch once the poll data */
968 revents
= LTTNG_POLL_GETEV(&events
, i
);
969 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
971 health_code_update();
973 /* Thread quit pipe has been closed. Killing thread. */
974 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
980 /* Event on the registration socket */
981 if (pollfd
== consumer_data
->err_sock
) {
982 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
983 ERR("consumer err socket poll error");
989 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
995 * Set the CLOEXEC flag. Return code is useless because either way, the
998 (void) utils_set_fd_cloexec(sock
);
1000 health_code_update();
1002 DBG2("Receiving code from consumer err_sock");
1004 /* Getting status code from kconsumerd */
1005 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1006 sizeof(enum lttcomm_return_code
));
1011 health_code_update();
1013 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1014 /* Connect both socket, command and metadata. */
1015 consumer_data
->cmd_sock
=
1016 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1017 consumer_data
->metadata_sock
.fd
=
1018 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1019 if (consumer_data
->cmd_sock
< 0 ||
1020 consumer_data
->metadata_sock
.fd
< 0) {
1021 PERROR("consumer connect cmd socket");
1022 /* On error, signal condition and quit. */
1023 signal_consumer_condition(consumer_data
, -1);
1026 /* Create metadata socket lock. */
1027 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1028 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1029 PERROR("zmalloc pthread mutex");
1033 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1035 signal_consumer_condition(consumer_data
, 1);
1036 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1037 DBG("Consumer metadata socket ready (fd: %d)",
1038 consumer_data
->metadata_sock
.fd
);
1040 ERR("consumer error when waiting for SOCK_READY : %s",
1041 lttcomm_get_readable_code(-code
));
1045 /* Remove the consumerd error sock since we've established a connexion */
1046 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1051 /* Add new accepted error socket. */
1052 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1057 /* Add metadata socket that is successfully connected. */
1058 ret
= lttng_poll_add(&events
, consumer_data
->metadata_sock
.fd
,
1059 LPOLLIN
| LPOLLRDHUP
);
1064 health_code_update();
1066 /* Infinite blocking call, waiting for transmission */
1069 health_poll_entry();
1070 ret
= lttng_poll_wait(&events
, -1);
1074 * Restart interrupted system call.
1076 if (errno
== EINTR
) {
1084 for (i
= 0; i
< nb_fd
; i
++) {
1085 /* Fetch once the poll data */
1086 revents
= LTTNG_POLL_GETEV(&events
, i
);
1087 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1089 health_code_update();
1091 /* Thread quit pipe has been closed. Killing thread. */
1092 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1098 if (pollfd
== sock
) {
1099 /* Event on the consumerd socket */
1100 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1101 ERR("consumer err socket second poll error");
1104 health_code_update();
1105 /* Wait for any kconsumerd error */
1106 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1107 sizeof(enum lttcomm_return_code
));
1109 ERR("consumer closed the command socket");
1113 ERR("consumer return code : %s",
1114 lttcomm_get_readable_code(-code
));
1117 } else if (pollfd
== consumer_data
->metadata_sock
.fd
) {
1118 /* UST metadata requests */
1119 ret
= ust_consumer_metadata_request(
1120 &consumer_data
->metadata_sock
);
1122 ERR("Handling metadata request");
1127 ERR("Unknown pollfd");
1131 health_code_update();
1136 /* Immediately set the consumerd state to stopped */
1137 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1138 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1139 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1140 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1141 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1143 /* Code flow error... */
1147 if (consumer_data
->err_sock
>= 0) {
1148 ret
= close(consumer_data
->err_sock
);
1153 if (consumer_data
->cmd_sock
>= 0) {
1154 ret
= close(consumer_data
->cmd_sock
);
1159 if (consumer_data
->metadata_sock
.fd
>= 0) {
1160 ret
= close(consumer_data
->metadata_sock
.fd
);
1165 /* Cleanup metadata socket mutex. */
1166 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1167 free(consumer_data
->metadata_sock
.lock
);
1176 unlink(consumer_data
->err_unix_sock_path
);
1177 unlink(consumer_data
->cmd_unix_sock_path
);
1178 consumer_data
->pid
= 0;
1180 lttng_poll_clean(&events
);
1184 ERR("Health error occurred in %s", __func__
);
1186 health_unregister();
1187 DBG("consumer thread cleanup completed");
1193 * This thread manage application communication.
1195 static void *thread_manage_apps(void *data
)
1197 int i
, ret
, pollfd
, err
= -1;
1198 uint32_t revents
, nb_fd
;
1199 struct lttng_poll_event events
;
1201 DBG("[thread] Manage application started");
1203 rcu_register_thread();
1204 rcu_thread_online();
1206 health_register(HEALTH_TYPE_APP_MANAGE
);
1208 if (testpoint(thread_manage_apps
)) {
1209 goto error_testpoint
;
1212 health_code_update();
1214 ret
= sessiond_set_thread_pollset(&events
, 2);
1216 goto error_poll_create
;
1219 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1224 if (testpoint(thread_manage_apps_before_loop
)) {
1228 health_code_update();
1231 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1233 /* Inifinite blocking call, waiting for transmission */
1235 health_poll_entry();
1236 ret
= lttng_poll_wait(&events
, -1);
1240 * Restart interrupted system call.
1242 if (errno
== EINTR
) {
1250 for (i
= 0; i
< nb_fd
; i
++) {
1251 /* Fetch once the poll data */
1252 revents
= LTTNG_POLL_GETEV(&events
, i
);
1253 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1255 health_code_update();
1257 /* Thread quit pipe has been closed. Killing thread. */
1258 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1264 /* Inspect the apps cmd pipe */
1265 if (pollfd
== apps_cmd_pipe
[0]) {
1266 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1267 ERR("Apps command pipe error");
1269 } else if (revents
& LPOLLIN
) {
1274 ret
= read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1275 } while (ret
< 0 && errno
== EINTR
);
1276 if (ret
< 0 || ret
< sizeof(sock
)) {
1277 PERROR("read apps cmd pipe");
1281 health_code_update();
1284 * We only monitor the error events of the socket. This
1285 * thread does not handle any incoming data from UST
1288 ret
= lttng_poll_add(&events
, sock
,
1289 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1294 /* Set socket timeout for both receiving and ending */
1295 (void) lttcomm_setsockopt_rcv_timeout(sock
,
1296 app_socket_timeout
);
1297 (void) lttcomm_setsockopt_snd_timeout(sock
,
1298 app_socket_timeout
);
1300 DBG("Apps with sock %d added to poll set", sock
);
1302 health_code_update();
1308 * At this point, we know that a registered application made
1309 * the event at poll_wait.
1311 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1312 /* Removing from the poll set */
1313 ret
= lttng_poll_del(&events
, pollfd
);
1318 /* Socket closed on remote end. */
1319 ust_app_unregister(pollfd
);
1324 health_code_update();
1330 lttng_poll_clean(&events
);
1333 utils_close_pipe(apps_cmd_pipe
);
1334 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1337 * We don't clean the UST app hash table here since already registered
1338 * applications can still be controlled so let them be until the session
1339 * daemon dies or the applications stop.
1344 ERR("Health error occurred in %s", __func__
);
1346 health_unregister();
1347 DBG("Application communication apps thread cleanup complete");
1348 rcu_thread_offline();
1349 rcu_unregister_thread();
1354 * Send a socket to a thread This is called from the dispatch UST registration
1355 * thread once all sockets are set for the application.
1357 * On success, return 0 else a negative value being the errno message of the
1360 static int send_socket_to_thread(int fd
, int sock
)
1364 /* Sockets MUST be set or else this should not have been called. */
1369 ret
= write(fd
, &sock
, sizeof(sock
));
1370 } while (ret
< 0 && errno
== EINTR
);
1371 if (ret
< 0 || ret
!= sizeof(sock
)) {
1372 PERROR("write apps pipe %d", fd
);
1379 /* All good. Don't send back the write positive ret value. */
1386 * Sanitize the wait queue of the dispatch registration thread meaning removing
1387 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1388 * notify socket is never received.
1390 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1392 int ret
, nb_fd
= 0, i
;
1393 unsigned int fd_added
= 0;
1394 struct lttng_poll_event events
;
1395 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1399 lttng_poll_init(&events
);
1401 /* Just skip everything for an empty queue. */
1402 if (!wait_queue
->count
) {
1406 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1411 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1412 &wait_queue
->head
, head
) {
1413 assert(wait_node
->app
);
1414 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1415 LPOLLHUP
| LPOLLERR
);
1428 * Poll but don't block so we can quickly identify the faulty events and
1429 * clean them afterwards from the wait queue.
1431 ret
= lttng_poll_wait(&events
, 0);
1437 for (i
= 0; i
< nb_fd
; i
++) {
1438 /* Get faulty FD. */
1439 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1440 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1442 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1443 &wait_queue
->head
, head
) {
1444 if (pollfd
== wait_node
->app
->sock
&&
1445 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1446 cds_list_del(&wait_node
->head
);
1447 wait_queue
->count
--;
1448 ust_app_destroy(wait_node
->app
);
1456 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1460 lttng_poll_clean(&events
);
1464 lttng_poll_clean(&events
);
1466 ERR("Unable to sanitize wait queue");
1471 * Dispatch request from the registration threads to the application
1472 * communication thread.
1474 static void *thread_dispatch_ust_registration(void *data
)
1477 struct cds_wfq_node
*node
;
1478 struct ust_command
*ust_cmd
= NULL
;
1479 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1480 struct ust_reg_wait_queue wait_queue
= {
1484 health_register(HEALTH_TYPE_APP_REG_DISPATCH
);
1486 health_code_update();
1488 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1490 DBG("[thread] Dispatch UST command started");
1492 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1493 health_code_update();
1495 /* Atomically prepare the queue futex */
1496 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1499 struct ust_app
*app
= NULL
;
1503 * Make sure we don't have node(s) that have hung up before receiving
1504 * the notify socket. This is to clean the list in order to avoid
1505 * memory leaks from notify socket that are never seen.
1507 sanitize_wait_queue(&wait_queue
);
1509 health_code_update();
1510 /* Dequeue command for registration */
1511 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1513 DBG("Woken up but nothing in the UST command queue");
1514 /* Continue thread execution */
1518 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1520 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1521 " gid:%d sock:%d name:%s (version %d.%d)",
1522 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1523 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1524 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1525 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1527 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1528 wait_node
= zmalloc(sizeof(*wait_node
));
1530 PERROR("zmalloc wait_node dispatch");
1531 ret
= close(ust_cmd
->sock
);
1533 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1535 lttng_fd_put(1, LTTNG_FD_APPS
);
1539 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1541 /* Create application object if socket is CMD. */
1542 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1544 if (!wait_node
->app
) {
1545 ret
= close(ust_cmd
->sock
);
1547 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1549 lttng_fd_put(1, LTTNG_FD_APPS
);
1555 * Add application to the wait queue so we can set the notify
1556 * socket before putting this object in the global ht.
1558 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1563 * We have to continue here since we don't have the notify
1564 * socket and the application MUST be added to the hash table
1565 * only at that moment.
1570 * Look for the application in the local wait queue and set the
1571 * notify socket if found.
1573 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1574 &wait_queue
.head
, head
) {
1575 health_code_update();
1576 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1577 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1578 cds_list_del(&wait_node
->head
);
1580 app
= wait_node
->app
;
1582 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1588 * With no application at this stage the received socket is
1589 * basically useless so close it before we free the cmd data
1590 * structure for good.
1593 ret
= close(ust_cmd
->sock
);
1595 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1597 lttng_fd_put(1, LTTNG_FD_APPS
);
1604 * @session_lock_list
1606 * Lock the global session list so from the register up to the
1607 * registration done message, no thread can see the application
1608 * and change its state.
1610 session_lock_list();
1614 * Add application to the global hash table. This needs to be
1615 * done before the update to the UST registry can locate the
1620 /* Set app version. This call will print an error if needed. */
1621 (void) ust_app_version(app
);
1623 /* Send notify socket through the notify pipe. */
1624 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1628 session_unlock_list();
1629 /* No notify thread, stop the UST tracing. */
1634 * Update newly registered application with the tracing
1635 * registry info already enabled information.
1637 update_ust_app(app
->sock
);
1640 * Don't care about return value. Let the manage apps threads
1641 * handle app unregistration upon socket close.
1643 (void) ust_app_register_done(app
->sock
);
1646 * Even if the application socket has been closed, send the app
1647 * to the thread and unregistration will take place at that
1650 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1653 session_unlock_list();
1654 /* No apps. thread, stop the UST tracing. */
1659 session_unlock_list();
1661 } while (node
!= NULL
);
1663 health_poll_entry();
1664 /* Futex wait on queue. Blocking call on futex() */
1665 futex_nto1_wait(&ust_cmd_queue
.futex
);
1668 /* Normal exit, no error */
1672 /* Clean up wait queue. */
1673 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1674 &wait_queue
.head
, head
) {
1675 cds_list_del(&wait_node
->head
);
1680 DBG("Dispatch thread dying");
1683 ERR("Health error occurred in %s", __func__
);
1685 health_unregister();
1690 * This thread manage application registration.
1692 static void *thread_registration_apps(void *data
)
1694 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1695 uint32_t revents
, nb_fd
;
1696 struct lttng_poll_event events
;
1698 * Get allocated in this thread, enqueued to a global queue, dequeued and
1699 * freed in the manage apps thread.
1701 struct ust_command
*ust_cmd
= NULL
;
1703 DBG("[thread] Manage application registration started");
1705 health_register(HEALTH_TYPE_APP_REG
);
1707 if (testpoint(thread_registration_apps
)) {
1708 goto error_testpoint
;
1711 ret
= lttcomm_listen_unix_sock(apps_sock
);
1717 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1718 * more will be added to this poll set.
1720 ret
= sessiond_set_thread_pollset(&events
, 2);
1722 goto error_create_poll
;
1725 /* Add the application registration socket */
1726 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1728 goto error_poll_add
;
1731 /* Notify all applications to register */
1732 ret
= notify_ust_apps(1);
1734 ERR("Failed to notify applications or create the wait shared memory.\n"
1735 "Execution continues but there might be problem for already\n"
1736 "running applications that wishes to register.");
1740 DBG("Accepting application registration");
1742 /* Inifinite blocking call, waiting for transmission */
1744 health_poll_entry();
1745 ret
= lttng_poll_wait(&events
, -1);
1749 * Restart interrupted system call.
1751 if (errno
== EINTR
) {
1759 for (i
= 0; i
< nb_fd
; i
++) {
1760 health_code_update();
1762 /* Fetch once the poll data */
1763 revents
= LTTNG_POLL_GETEV(&events
, i
);
1764 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1766 /* Thread quit pipe has been closed. Killing thread. */
1767 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1773 /* Event on the registration socket */
1774 if (pollfd
== apps_sock
) {
1775 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1776 ERR("Register apps socket poll error");
1778 } else if (revents
& LPOLLIN
) {
1779 sock
= lttcomm_accept_unix_sock(apps_sock
);
1785 * Set the CLOEXEC flag. Return code is useless because
1786 * either way, the show must go on.
1788 (void) utils_set_fd_cloexec(sock
);
1790 /* Create UST registration command for enqueuing */
1791 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1792 if (ust_cmd
== NULL
) {
1793 PERROR("ust command zmalloc");
1798 * Using message-based transmissions to ensure we don't
1799 * have to deal with partially received messages.
1801 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1803 ERR("Exhausted file descriptors allowed for applications.");
1813 health_code_update();
1814 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
1817 /* Close socket of the application. */
1822 lttng_fd_put(LTTNG_FD_APPS
, 1);
1826 health_code_update();
1828 ust_cmd
->sock
= sock
;
1831 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1832 " gid:%d sock:%d name:%s (version %d.%d)",
1833 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1834 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1835 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1836 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1839 * Lock free enqueue the registration request. The red pill
1840 * has been taken! This apps will be part of the *system*.
1842 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1845 * Wake the registration queue futex. Implicit memory
1846 * barrier with the exchange in cds_wfq_enqueue.
1848 futex_nto1_wake(&ust_cmd_queue
.futex
);
1858 ERR("Health error occurred in %s", __func__
);
1861 /* Notify that the registration thread is gone */
1864 if (apps_sock
>= 0) {
1865 ret
= close(apps_sock
);
1875 lttng_fd_put(LTTNG_FD_APPS
, 1);
1877 unlink(apps_unix_sock_path
);
1880 lttng_poll_clean(&events
);
1884 DBG("UST Registration thread cleanup complete");
1885 health_unregister();
1891 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1892 * exec or it will fails.
1894 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1897 struct timespec timeout
;
1899 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1900 consumer_data
->consumer_thread_is_ready
= 0;
1902 /* Setup pthread condition */
1903 ret
= pthread_condattr_init(&consumer_data
->condattr
);
1906 PERROR("pthread_condattr_init consumer data");
1911 * Set the monotonic clock in order to make sure we DO NOT jump in time
1912 * between the clock_gettime() call and the timedwait call. See bug #324
1913 * for a more details and how we noticed it.
1915 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
1918 PERROR("pthread_condattr_setclock consumer data");
1922 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
1925 PERROR("pthread_cond_init consumer data");
1929 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
1932 PERROR("pthread_create consumer");
1937 /* We are about to wait on a pthread condition */
1938 pthread_mutex_lock(&consumer_data
->cond_mutex
);
1940 /* Get time for sem_timedwait absolute timeout */
1941 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
1943 * Set the timeout for the condition timed wait even if the clock gettime
1944 * call fails since we might loop on that call and we want to avoid to
1945 * increment the timeout too many times.
1947 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1950 * The following loop COULD be skipped in some conditions so this is why we
1951 * set ret to 0 in order to make sure at least one round of the loop is
1957 * Loop until the condition is reached or when a timeout is reached. Note
1958 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1959 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1960 * possible. This loop does not take any chances and works with both of
1963 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
1964 if (clock_ret
< 0) {
1965 PERROR("clock_gettime spawn consumer");
1966 /* Infinite wait for the consumerd thread to be ready */
1967 ret
= pthread_cond_wait(&consumer_data
->cond
,
1968 &consumer_data
->cond_mutex
);
1970 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
1971 &consumer_data
->cond_mutex
, &timeout
);
1975 /* Release the pthread condition */
1976 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
1980 if (ret
== ETIMEDOUT
) {
1982 * Call has timed out so we kill the kconsumerd_thread and return
1985 ERR("Condition timed out. The consumer thread was never ready."
1987 ret
= pthread_cancel(consumer_data
->thread
);
1989 PERROR("pthread_cancel consumer thread");
1992 PERROR("pthread_cond_wait failed consumer thread");
1997 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1998 if (consumer_data
->pid
== 0) {
1999 ERR("Consumerd did not start");
2000 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2003 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2012 * Join consumer thread
2014 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2018 /* Consumer pid must be a real one. */
2019 if (consumer_data
->pid
> 0) {
2021 ret
= kill(consumer_data
->pid
, SIGTERM
);
2023 ERR("Error killing consumer daemon");
2026 return pthread_join(consumer_data
->thread
, &status
);
2033 * Fork and exec a consumer daemon (consumerd).
2035 * Return pid if successful else -1.
2037 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2041 const char *consumer_to_use
;
2042 const char *verbosity
;
2045 DBG("Spawning consumerd");
2052 if (opt_verbose_consumer
) {
2053 verbosity
= "--verbose";
2055 verbosity
= "--quiet";
2057 switch (consumer_data
->type
) {
2058 case LTTNG_CONSUMER_KERNEL
:
2060 * Find out which consumerd to execute. We will first try the
2061 * 64-bit path, then the sessiond's installation directory, and
2062 * fallback on the 32-bit one,
2064 DBG3("Looking for a kernel consumer at these locations:");
2065 DBG3(" 1) %s", consumerd64_bin
);
2066 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2067 DBG3(" 3) %s", consumerd32_bin
);
2068 if (stat(consumerd64_bin
, &st
) == 0) {
2069 DBG3("Found location #1");
2070 consumer_to_use
= consumerd64_bin
;
2071 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2072 DBG3("Found location #2");
2073 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2074 } else if (stat(consumerd32_bin
, &st
) == 0) {
2075 DBG3("Found location #3");
2076 consumer_to_use
= consumerd32_bin
;
2078 DBG("Could not find any valid consumerd executable");
2081 DBG("Using kernel consumer at: %s", consumer_to_use
);
2082 execl(consumer_to_use
,
2083 "lttng-consumerd", verbosity
, "-k",
2084 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2085 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2088 case LTTNG_CONSUMER64_UST
:
2090 char *tmpnew
= NULL
;
2092 if (consumerd64_libdir
[0] != '\0') {
2096 tmp
= getenv("LD_LIBRARY_PATH");
2100 tmplen
= strlen("LD_LIBRARY_PATH=")
2101 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2102 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2107 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2108 strcat(tmpnew
, consumerd64_libdir
);
2109 if (tmp
[0] != '\0') {
2110 strcat(tmpnew
, ":");
2111 strcat(tmpnew
, tmp
);
2113 ret
= putenv(tmpnew
);
2120 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2121 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2122 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2123 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2125 if (consumerd64_libdir
[0] != '\0') {
2133 case LTTNG_CONSUMER32_UST
:
2135 char *tmpnew
= NULL
;
2137 if (consumerd32_libdir
[0] != '\0') {
2141 tmp
= getenv("LD_LIBRARY_PATH");
2145 tmplen
= strlen("LD_LIBRARY_PATH=")
2146 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2147 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2152 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2153 strcat(tmpnew
, consumerd32_libdir
);
2154 if (tmp
[0] != '\0') {
2155 strcat(tmpnew
, ":");
2156 strcat(tmpnew
, tmp
);
2158 ret
= putenv(tmpnew
);
2165 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2166 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2167 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2168 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2170 if (consumerd32_libdir
[0] != '\0') {
2179 PERROR("unknown consumer type");
2183 PERROR("kernel start consumer exec");
2186 } else if (pid
> 0) {
2189 PERROR("start consumer fork");
2197 * Spawn the consumerd daemon and session daemon thread.
2199 static int start_consumerd(struct consumer_data
*consumer_data
)
2204 * Set the listen() state on the socket since there is a possible race
2205 * between the exec() of the consumer daemon and this call if place in the
2206 * consumer thread. See bug #366 for more details.
2208 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2213 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2214 if (consumer_data
->pid
!= 0) {
2215 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2219 ret
= spawn_consumerd(consumer_data
);
2221 ERR("Spawning consumerd failed");
2222 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2226 /* Setting up the consumer_data pid */
2227 consumer_data
->pid
= ret
;
2228 DBG2("Consumer pid %d", consumer_data
->pid
);
2229 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2231 DBG2("Spawning consumer control thread");
2232 ret
= spawn_consumer_thread(consumer_data
);
2234 ERR("Fatal error spawning consumer control thread");
2242 /* Cleanup already created sockets on error. */
2243 if (consumer_data
->err_sock
>= 0) {
2246 err
= close(consumer_data
->err_sock
);
2248 PERROR("close consumer data error socket");
2255 * Compute health status of each consumer. If one of them is zero (bad
2256 * state), we return 0.
2258 static int check_consumer_health(void)
2262 ret
= health_check_state(HEALTH_TYPE_CONSUMER
);
2264 DBG3("Health consumer check %d", ret
);
2270 * Setup necessary data for kernel tracer action.
2272 static int init_kernel_tracer(void)
2276 /* Modprobe lttng kernel modules */
2277 ret
= modprobe_lttng_control();
2282 /* Open debugfs lttng */
2283 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2284 if (kernel_tracer_fd
< 0) {
2285 DBG("Failed to open %s", module_proc_lttng
);
2290 /* Validate kernel version */
2291 ret
= kernel_validate_version(kernel_tracer_fd
);
2296 ret
= modprobe_lttng_data();
2301 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2305 modprobe_remove_lttng_control();
2306 ret
= close(kernel_tracer_fd
);
2310 kernel_tracer_fd
= -1;
2311 return LTTNG_ERR_KERN_VERSION
;
2314 ret
= close(kernel_tracer_fd
);
2320 modprobe_remove_lttng_control();
2323 WARN("No kernel tracer available");
2324 kernel_tracer_fd
= -1;
2326 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2328 return LTTNG_ERR_KERN_NA
;
2334 * Copy consumer output from the tracing session to the domain session. The
2335 * function also applies the right modification on a per domain basis for the
2336 * trace files destination directory.
2338 * Should *NOT* be called with RCU read-side lock held.
2340 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2343 const char *dir_name
;
2344 struct consumer_output
*consumer
;
2347 assert(session
->consumer
);
2350 case LTTNG_DOMAIN_KERNEL
:
2351 DBG3("Copying tracing session consumer output in kernel session");
2353 * XXX: We should audit the session creation and what this function
2354 * does "extra" in order to avoid a destroy since this function is used
2355 * in the domain session creation (kernel and ust) only. Same for UST
2358 if (session
->kernel_session
->consumer
) {
2359 consumer_destroy_output(session
->kernel_session
->consumer
);
2361 session
->kernel_session
->consumer
=
2362 consumer_copy_output(session
->consumer
);
2363 /* Ease our life a bit for the next part */
2364 consumer
= session
->kernel_session
->consumer
;
2365 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2367 case LTTNG_DOMAIN_UST
:
2368 DBG3("Copying tracing session consumer output in UST session");
2369 if (session
->ust_session
->consumer
) {
2370 consumer_destroy_output(session
->ust_session
->consumer
);
2372 session
->ust_session
->consumer
=
2373 consumer_copy_output(session
->consumer
);
2374 /* Ease our life a bit for the next part */
2375 consumer
= session
->ust_session
->consumer
;
2376 dir_name
= DEFAULT_UST_TRACE_DIR
;
2379 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2383 /* Append correct directory to subdir */
2384 strncat(consumer
->subdir
, dir_name
,
2385 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2386 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2395 * Create an UST session and add it to the session ust list.
2397 * Should *NOT* be called with RCU read-side lock held.
2399 static int create_ust_session(struct ltt_session
*session
,
2400 struct lttng_domain
*domain
)
2403 struct ltt_ust_session
*lus
= NULL
;
2407 assert(session
->consumer
);
2409 switch (domain
->type
) {
2410 case LTTNG_DOMAIN_UST
:
2413 ERR("Unknown UST domain on create session %d", domain
->type
);
2414 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2418 DBG("Creating UST session");
2420 lus
= trace_ust_create_session(session
->id
);
2422 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2426 lus
->uid
= session
->uid
;
2427 lus
->gid
= session
->gid
;
2428 lus
->output_traces
= session
->output_traces
;
2429 session
->ust_session
= lus
;
2431 /* Copy session output to the newly created UST session */
2432 ret
= copy_session_consumer(domain
->type
, session
);
2433 if (ret
!= LTTNG_OK
) {
2441 session
->ust_session
= NULL
;
2446 * Create a kernel tracer session then create the default channel.
2448 static int create_kernel_session(struct ltt_session
*session
)
2452 DBG("Creating kernel session");
2454 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2456 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2460 /* Code flow safety */
2461 assert(session
->kernel_session
);
2463 /* Copy session output to the newly created Kernel session */
2464 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2465 if (ret
!= LTTNG_OK
) {
2469 /* Create directory(ies) on local filesystem. */
2470 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2471 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2472 ret
= run_as_mkdir_recursive(
2473 session
->kernel_session
->consumer
->dst
.trace_path
,
2474 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2476 if (ret
!= -EEXIST
) {
2477 ERR("Trace directory creation error");
2483 session
->kernel_session
->uid
= session
->uid
;
2484 session
->kernel_session
->gid
= session
->gid
;
2485 session
->kernel_session
->output_traces
= session
->output_traces
;
2490 trace_kernel_destroy_session(session
->kernel_session
);
2491 session
->kernel_session
= NULL
;
2496 * Count number of session permitted by uid/gid.
2498 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2501 struct ltt_session
*session
;
2503 DBG("Counting number of available session for UID %d GID %d",
2505 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2507 * Only list the sessions the user can control.
2509 if (!session_access_ok(session
, uid
, gid
)) {
2518 * Process the command requested by the lttng client within the command
2519 * context structure. This function make sure that the return structure (llm)
2520 * is set and ready for transmission before returning.
2522 * Return any error encountered or 0 for success.
2524 * "sock" is only used for special-case var. len data.
2526 * Should *NOT* be called with RCU read-side lock held.
2528 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2532 int need_tracing_session
= 1;
2535 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2539 switch (cmd_ctx
->lsm
->cmd_type
) {
2540 case LTTNG_CREATE_SESSION
:
2541 case LTTNG_DESTROY_SESSION
:
2542 case LTTNG_LIST_SESSIONS
:
2543 case LTTNG_LIST_DOMAINS
:
2544 case LTTNG_START_TRACE
:
2545 case LTTNG_STOP_TRACE
:
2546 case LTTNG_DATA_PENDING
:
2547 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2548 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2549 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2550 case LTTNG_SNAPSHOT_RECORD
:
2557 if (opt_no_kernel
&& need_domain
2558 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2560 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2562 ret
= LTTNG_ERR_KERN_NA
;
2567 /* Deny register consumer if we already have a spawned consumer. */
2568 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2569 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2570 if (kconsumer_data
.pid
> 0) {
2571 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2572 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2575 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2579 * Check for command that don't needs to allocate a returned payload. We do
2580 * this here so we don't have to make the call for no payload at each
2583 switch(cmd_ctx
->lsm
->cmd_type
) {
2584 case LTTNG_LIST_SESSIONS
:
2585 case LTTNG_LIST_TRACEPOINTS
:
2586 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2587 case LTTNG_LIST_DOMAINS
:
2588 case LTTNG_LIST_CHANNELS
:
2589 case LTTNG_LIST_EVENTS
:
2592 /* Setup lttng message with no payload */
2593 ret
= setup_lttng_msg(cmd_ctx
, 0);
2595 /* This label does not try to unlock the session */
2596 goto init_setup_error
;
2600 /* Commands that DO NOT need a session. */
2601 switch (cmd_ctx
->lsm
->cmd_type
) {
2602 case LTTNG_CREATE_SESSION
:
2603 case LTTNG_CALIBRATE
:
2604 case LTTNG_LIST_SESSIONS
:
2605 case LTTNG_LIST_TRACEPOINTS
:
2606 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2607 need_tracing_session
= 0;
2610 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2612 * We keep the session list lock across _all_ commands
2613 * for now, because the per-session lock does not
2614 * handle teardown properly.
2616 session_lock_list();
2617 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2618 if (cmd_ctx
->session
== NULL
) {
2619 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2622 /* Acquire lock for the session */
2623 session_lock(cmd_ctx
->session
);
2633 * Check domain type for specific "pre-action".
2635 switch (cmd_ctx
->lsm
->domain
.type
) {
2636 case LTTNG_DOMAIN_KERNEL
:
2638 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2642 /* Kernel tracer check */
2643 if (kernel_tracer_fd
== -1) {
2644 /* Basically, load kernel tracer modules */
2645 ret
= init_kernel_tracer();
2651 /* Consumer is in an ERROR state. Report back to client */
2652 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2653 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2657 /* Need a session for kernel command */
2658 if (need_tracing_session
) {
2659 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2660 ret
= create_kernel_session(cmd_ctx
->session
);
2662 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2667 /* Start the kernel consumer daemon */
2668 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2669 if (kconsumer_data
.pid
== 0 &&
2670 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2671 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2672 ret
= start_consumerd(&kconsumer_data
);
2674 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2677 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2679 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2683 * The consumer was just spawned so we need to add the socket to
2684 * the consumer output of the session if exist.
2686 ret
= consumer_create_socket(&kconsumer_data
,
2687 cmd_ctx
->session
->kernel_session
->consumer
);
2694 case LTTNG_DOMAIN_UST
:
2696 /* Consumer is in an ERROR state. Report back to client */
2697 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2698 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2702 if (need_tracing_session
) {
2703 /* Create UST session if none exist. */
2704 if (cmd_ctx
->session
->ust_session
== NULL
) {
2705 ret
= create_ust_session(cmd_ctx
->session
,
2706 &cmd_ctx
->lsm
->domain
);
2707 if (ret
!= LTTNG_OK
) {
2712 /* Start the UST consumer daemons */
2714 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2715 if (consumerd64_bin
[0] != '\0' &&
2716 ustconsumer64_data
.pid
== 0 &&
2717 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2718 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2719 ret
= start_consumerd(&ustconsumer64_data
);
2721 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2722 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2726 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2727 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2729 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2733 * Setup socket for consumer 64 bit. No need for atomic access
2734 * since it was set above and can ONLY be set in this thread.
2736 ret
= consumer_create_socket(&ustconsumer64_data
,
2737 cmd_ctx
->session
->ust_session
->consumer
);
2743 if (consumerd32_bin
[0] != '\0' &&
2744 ustconsumer32_data
.pid
== 0 &&
2745 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2746 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2747 ret
= start_consumerd(&ustconsumer32_data
);
2749 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2750 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2754 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2755 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2757 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2761 * Setup socket for consumer 64 bit. No need for atomic access
2762 * since it was set above and can ONLY be set in this thread.
2764 ret
= consumer_create_socket(&ustconsumer32_data
,
2765 cmd_ctx
->session
->ust_session
->consumer
);
2777 /* Validate consumer daemon state when start/stop trace command */
2778 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2779 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2780 switch (cmd_ctx
->lsm
->domain
.type
) {
2781 case LTTNG_DOMAIN_UST
:
2782 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2783 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2787 case LTTNG_DOMAIN_KERNEL
:
2788 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2789 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2797 * Check that the UID or GID match that of the tracing session.
2798 * The root user can interact with all sessions.
2800 if (need_tracing_session
) {
2801 if (!session_access_ok(cmd_ctx
->session
,
2802 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2803 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2804 ret
= LTTNG_ERR_EPERM
;
2810 * Send relayd information to consumer as soon as we have a domain and a
2813 if (cmd_ctx
->session
&& need_domain
) {
2815 * Setup relayd if not done yet. If the relayd information was already
2816 * sent to the consumer, this call will gracefully return.
2818 ret
= cmd_setup_relayd(cmd_ctx
->session
);
2819 if (ret
!= LTTNG_OK
) {
2824 /* Process by command type */
2825 switch (cmd_ctx
->lsm
->cmd_type
) {
2826 case LTTNG_ADD_CONTEXT
:
2828 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2829 cmd_ctx
->lsm
->u
.context
.channel_name
,
2830 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2833 case LTTNG_DISABLE_CHANNEL
:
2835 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2836 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2839 case LTTNG_DISABLE_EVENT
:
2841 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2842 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2843 cmd_ctx
->lsm
->u
.disable
.name
);
2846 case LTTNG_DISABLE_ALL_EVENT
:
2848 DBG("Disabling all events");
2850 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2851 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2854 case LTTNG_ENABLE_CHANNEL
:
2856 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2857 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2860 case LTTNG_ENABLE_EVENT
:
2862 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2863 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2864 &cmd_ctx
->lsm
->u
.enable
.event
, NULL
, kernel_poll_pipe
[1]);
2867 case LTTNG_ENABLE_ALL_EVENT
:
2869 DBG("Enabling all events");
2871 ret
= cmd_enable_event_all(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2872 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2873 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
2876 case LTTNG_LIST_TRACEPOINTS
:
2878 struct lttng_event
*events
;
2881 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2882 if (nb_events
< 0) {
2883 /* Return value is a negative lttng_error_code. */
2889 * Setup lttng message with payload size set to the event list size in
2890 * bytes and then copy list into the llm payload.
2892 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2898 /* Copy event list into message payload */
2899 memcpy(cmd_ctx
->llm
->payload
, events
,
2900 sizeof(struct lttng_event
) * nb_events
);
2907 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2909 struct lttng_event_field
*fields
;
2912 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2914 if (nb_fields
< 0) {
2915 /* Return value is a negative lttng_error_code. */
2921 * Setup lttng message with payload size set to the event list size in
2922 * bytes and then copy list into the llm payload.
2924 ret
= setup_lttng_msg(cmd_ctx
,
2925 sizeof(struct lttng_event_field
) * nb_fields
);
2931 /* Copy event list into message payload */
2932 memcpy(cmd_ctx
->llm
->payload
, fields
,
2933 sizeof(struct lttng_event_field
) * nb_fields
);
2940 case LTTNG_SET_CONSUMER_URI
:
2943 struct lttng_uri
*uris
;
2945 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2946 len
= nb_uri
* sizeof(struct lttng_uri
);
2949 ret
= LTTNG_ERR_INVALID
;
2953 uris
= zmalloc(len
);
2955 ret
= LTTNG_ERR_FATAL
;
2959 /* Receive variable len data */
2960 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
2961 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2963 DBG("No URIs received from client... continuing");
2965 ret
= LTTNG_ERR_SESSION_FAIL
;
2970 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
2972 if (ret
!= LTTNG_OK
) {
2978 * XXX: 0 means that this URI should be applied on the session. Should
2979 * be a DOMAIN enuam.
2981 if (cmd_ctx
->lsm
->domain
.type
== 0) {
2982 /* Add the URI for the UST session if a consumer is present. */
2983 if (cmd_ctx
->session
->ust_session
&&
2984 cmd_ctx
->session
->ust_session
->consumer
) {
2985 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
2987 } else if (cmd_ctx
->session
->kernel_session
&&
2988 cmd_ctx
->session
->kernel_session
->consumer
) {
2989 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
2990 cmd_ctx
->session
, nb_uri
, uris
);
2998 case LTTNG_START_TRACE
:
3000 ret
= cmd_start_trace(cmd_ctx
->session
);
3003 case LTTNG_STOP_TRACE
:
3005 ret
= cmd_stop_trace(cmd_ctx
->session
);
3008 case LTTNG_CREATE_SESSION
:
3011 struct lttng_uri
*uris
= NULL
;
3013 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3014 len
= nb_uri
* sizeof(struct lttng_uri
);
3017 uris
= zmalloc(len
);
3019 ret
= LTTNG_ERR_FATAL
;
3023 /* Receive variable len data */
3024 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3025 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3027 DBG("No URIs received from client... continuing");
3029 ret
= LTTNG_ERR_SESSION_FAIL
;
3034 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3035 DBG("Creating session with ONE network URI is a bad call");
3036 ret
= LTTNG_ERR_SESSION_FAIL
;
3042 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3049 case LTTNG_DESTROY_SESSION
:
3051 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3053 /* Set session to NULL so we do not unlock it after free. */
3054 cmd_ctx
->session
= NULL
;
3057 case LTTNG_LIST_DOMAINS
:
3060 struct lttng_domain
*domains
;
3062 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3064 /* Return value is a negative lttng_error_code. */
3069 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3075 /* Copy event list into message payload */
3076 memcpy(cmd_ctx
->llm
->payload
, domains
,
3077 nb_dom
* sizeof(struct lttng_domain
));
3084 case LTTNG_LIST_CHANNELS
:
3087 struct lttng_channel
*channels
;
3089 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3090 cmd_ctx
->session
, &channels
);
3092 /* Return value is a negative lttng_error_code. */
3097 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3103 /* Copy event list into message payload */
3104 memcpy(cmd_ctx
->llm
->payload
, channels
,
3105 nb_chan
* sizeof(struct lttng_channel
));
3112 case LTTNG_LIST_EVENTS
:
3115 struct lttng_event
*events
= NULL
;
3117 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3118 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3120 /* Return value is a negative lttng_error_code. */
3125 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3131 /* Copy event list into message payload */
3132 memcpy(cmd_ctx
->llm
->payload
, events
,
3133 nb_event
* sizeof(struct lttng_event
));
3140 case LTTNG_LIST_SESSIONS
:
3142 unsigned int nr_sessions
;
3144 session_lock_list();
3145 nr_sessions
= lttng_sessions_count(
3146 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3147 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3149 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3151 session_unlock_list();
3155 /* Filled the session array */
3156 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3157 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3158 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3160 session_unlock_list();
3165 case LTTNG_CALIBRATE
:
3167 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3168 &cmd_ctx
->lsm
->u
.calibrate
);
3171 case LTTNG_REGISTER_CONSUMER
:
3173 struct consumer_data
*cdata
;
3175 switch (cmd_ctx
->lsm
->domain
.type
) {
3176 case LTTNG_DOMAIN_KERNEL
:
3177 cdata
= &kconsumer_data
;
3180 ret
= LTTNG_ERR_UND
;
3184 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3185 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3188 case LTTNG_ENABLE_EVENT_WITH_FILTER
:
3190 struct lttng_filter_bytecode
*bytecode
;
3192 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3193 ret
= LTTNG_ERR_FILTER_INVAL
;
3196 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
== 0) {
3197 ret
= LTTNG_ERR_FILTER_INVAL
;
3200 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3202 ret
= LTTNG_ERR_FILTER_NOMEM
;
3205 /* Receive var. len. data */
3206 DBG("Receiving var len data from client ...");
3207 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
3208 cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3210 DBG("Nothing recv() from client var len data... continuing");
3212 ret
= LTTNG_ERR_FILTER_INVAL
;
3216 if (bytecode
->len
+ sizeof(*bytecode
)
3217 != cmd_ctx
->lsm
->u
.enable
.bytecode_len
) {
3219 ret
= LTTNG_ERR_FILTER_INVAL
;
3223 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3224 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3225 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, kernel_poll_pipe
[1]);
3228 case LTTNG_DATA_PENDING
:
3230 ret
= cmd_data_pending(cmd_ctx
->session
);
3233 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3235 struct lttcomm_lttng_output_id reply
;
3237 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3238 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3239 if (ret
!= LTTNG_OK
) {
3243 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3248 /* Copy output list into message payload */
3249 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3253 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3255 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3256 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3259 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3262 struct lttng_snapshot_output
*outputs
= NULL
;
3264 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3265 if (nb_output
< 0) {
3270 ret
= setup_lttng_msg(cmd_ctx
,
3271 nb_output
* sizeof(struct lttng_snapshot_output
));
3278 /* Copy output list into message payload */
3279 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3280 nb_output
* sizeof(struct lttng_snapshot_output
));
3287 case LTTNG_SNAPSHOT_RECORD
:
3289 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3290 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3291 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3295 ret
= LTTNG_ERR_UND
;
3300 if (cmd_ctx
->llm
== NULL
) {
3301 DBG("Missing llm structure. Allocating one.");
3302 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3306 /* Set return code */
3307 cmd_ctx
->llm
->ret_code
= ret
;
3309 if (cmd_ctx
->session
) {
3310 session_unlock(cmd_ctx
->session
);
3312 if (need_tracing_session
) {
3313 session_unlock_list();
3320 * Thread managing health check socket.
3322 static void *thread_manage_health(void *data
)
3324 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3325 uint32_t revents
, nb_fd
;
3326 struct lttng_poll_event events
;
3327 struct lttcomm_health_msg msg
;
3328 struct lttcomm_health_data reply
;
3330 DBG("[thread] Manage health check started");
3332 rcu_register_thread();
3334 /* We might hit an error path before this is created. */
3335 lttng_poll_init(&events
);
3337 /* Create unix socket */
3338 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3340 ERR("Unable to create health check Unix socket");
3346 * Set the CLOEXEC flag. Return code is useless because either way, the
3349 (void) utils_set_fd_cloexec(sock
);
3351 ret
= lttcomm_listen_unix_sock(sock
);
3357 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3358 * more will be added to this poll set.
3360 ret
= sessiond_set_thread_pollset(&events
, 2);
3365 /* Add the application registration socket */
3366 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3372 DBG("Health check ready");
3374 /* Inifinite blocking call, waiting for transmission */
3376 ret
= lttng_poll_wait(&events
, -1);
3379 * Restart interrupted system call.
3381 if (errno
== EINTR
) {
3389 for (i
= 0; i
< nb_fd
; i
++) {
3390 /* Fetch once the poll data */
3391 revents
= LTTNG_POLL_GETEV(&events
, i
);
3392 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3394 /* Thread quit pipe has been closed. Killing thread. */
3395 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3401 /* Event on the registration socket */
3402 if (pollfd
== sock
) {
3403 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3404 ERR("Health socket poll error");
3410 new_sock
= lttcomm_accept_unix_sock(sock
);
3416 * Set the CLOEXEC flag. Return code is useless because either way, the
3419 (void) utils_set_fd_cloexec(new_sock
);
3421 DBG("Receiving data from client for health...");
3422 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3424 DBG("Nothing recv() from client... continuing");
3425 ret
= close(new_sock
);
3433 rcu_thread_online();
3435 switch (msg
.component
) {
3436 case LTTNG_HEALTH_CMD
:
3437 reply
.ret_code
= health_check_state(HEALTH_TYPE_CMD
);
3439 case LTTNG_HEALTH_APP_MANAGE
:
3440 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_MANAGE
);
3442 case LTTNG_HEALTH_APP_REG
:
3443 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_REG
);
3445 case LTTNG_HEALTH_KERNEL
:
3446 reply
.ret_code
= health_check_state(HEALTH_TYPE_KERNEL
);
3448 case LTTNG_HEALTH_CONSUMER
:
3449 reply
.ret_code
= check_consumer_health();
3451 case LTTNG_HEALTH_HT_CLEANUP
:
3452 reply
.ret_code
= health_check_state(HEALTH_TYPE_HT_CLEANUP
);
3454 case LTTNG_HEALTH_APP_MANAGE_NOTIFY
:
3455 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY
);
3457 case LTTNG_HEALTH_APP_REG_DISPATCH
:
3458 reply
.ret_code
= health_check_state(HEALTH_TYPE_APP_REG_DISPATCH
);
3460 case LTTNG_HEALTH_ALL
:
3462 health_check_state(HEALTH_TYPE_APP_MANAGE
) &&
3463 health_check_state(HEALTH_TYPE_APP_REG
) &&
3464 health_check_state(HEALTH_TYPE_CMD
) &&
3465 health_check_state(HEALTH_TYPE_KERNEL
) &&
3466 check_consumer_health() &&
3467 health_check_state(HEALTH_TYPE_HT_CLEANUP
) &&
3468 health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY
) &&
3469 health_check_state(HEALTH_TYPE_APP_REG_DISPATCH
);
3472 reply
.ret_code
= LTTNG_ERR_UND
;
3477 * Flip ret value since 0 is a success and 1 indicates a bad health for
3478 * the client where in the sessiond it is the opposite. Again, this is
3479 * just to make things easier for us poor developer which enjoy a lot
3482 if (reply
.ret_code
== 0 || reply
.ret_code
== 1) {
3483 reply
.ret_code
= !reply
.ret_code
;
3486 DBG2("Health check return value %d", reply
.ret_code
);
3488 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3490 ERR("Failed to send health data back to client");
3493 /* End of transmission */
3494 ret
= close(new_sock
);
3504 ERR("Health error occurred in %s", __func__
);
3506 DBG("Health check thread dying");
3507 unlink(health_unix_sock_path
);
3515 lttng_poll_clean(&events
);
3517 rcu_unregister_thread();
3522 * This thread manage all clients request using the unix client socket for
3525 static void *thread_manage_clients(void *data
)
3527 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3529 uint32_t revents
, nb_fd
;
3530 struct command_ctx
*cmd_ctx
= NULL
;
3531 struct lttng_poll_event events
;
3533 DBG("[thread] Manage client started");
3535 rcu_register_thread();
3537 health_register(HEALTH_TYPE_CMD
);
3539 if (testpoint(thread_manage_clients
)) {
3540 goto error_testpoint
;
3543 health_code_update();
3545 ret
= lttcomm_listen_unix_sock(client_sock
);
3551 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3552 * more will be added to this poll set.
3554 ret
= sessiond_set_thread_pollset(&events
, 2);
3556 goto error_create_poll
;
3559 /* Add the application registration socket */
3560 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3566 * Notify parent pid that we are ready to accept command for client side.
3568 if (opt_sig_parent
) {
3569 kill(ppid
, SIGUSR1
);
3572 if (testpoint(thread_manage_clients_before_loop
)) {
3576 health_code_update();
3579 DBG("Accepting client command ...");
3581 /* Inifinite blocking call, waiting for transmission */
3583 health_poll_entry();
3584 ret
= lttng_poll_wait(&events
, -1);
3588 * Restart interrupted system call.
3590 if (errno
== EINTR
) {
3598 for (i
= 0; i
< nb_fd
; i
++) {
3599 /* Fetch once the poll data */
3600 revents
= LTTNG_POLL_GETEV(&events
, i
);
3601 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3603 health_code_update();
3605 /* Thread quit pipe has been closed. Killing thread. */
3606 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3612 /* Event on the registration socket */
3613 if (pollfd
== client_sock
) {
3614 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3615 ERR("Client socket poll error");
3621 DBG("Wait for client response");
3623 health_code_update();
3625 sock
= lttcomm_accept_unix_sock(client_sock
);
3631 * Set the CLOEXEC flag. Return code is useless because either way, the
3634 (void) utils_set_fd_cloexec(sock
);
3636 /* Set socket option for credentials retrieval */
3637 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3642 /* Allocate context command to process the client request */
3643 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3644 if (cmd_ctx
== NULL
) {
3645 PERROR("zmalloc cmd_ctx");
3649 /* Allocate data buffer for reception */
3650 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3651 if (cmd_ctx
->lsm
== NULL
) {
3652 PERROR("zmalloc cmd_ctx->lsm");
3656 cmd_ctx
->llm
= NULL
;
3657 cmd_ctx
->session
= NULL
;
3659 health_code_update();
3662 * Data is received from the lttng client. The struct
3663 * lttcomm_session_msg (lsm) contains the command and data request of
3666 DBG("Receiving data from client ...");
3667 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3668 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3670 DBG("Nothing recv() from client... continuing");
3676 clean_command_ctx(&cmd_ctx
);
3680 health_code_update();
3682 // TODO: Validate cmd_ctx including sanity check for
3683 // security purpose.
3685 rcu_thread_online();
3687 * This function dispatch the work to the kernel or userspace tracer
3688 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3689 * informations for the client. The command context struct contains
3690 * everything this function may needs.
3692 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3693 rcu_thread_offline();
3701 * TODO: Inform client somehow of the fatal error. At
3702 * this point, ret < 0 means that a zmalloc failed
3703 * (ENOMEM). Error detected but still accept
3704 * command, unless a socket error has been
3707 clean_command_ctx(&cmd_ctx
);
3711 health_code_update();
3713 DBG("Sending response (size: %d, retcode: %s)",
3714 cmd_ctx
->lttng_msg_size
,
3715 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3716 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3718 ERR("Failed to send data back to client");
3721 /* End of transmission */
3728 clean_command_ctx(&cmd_ctx
);
3730 health_code_update();
3742 lttng_poll_clean(&events
);
3743 clean_command_ctx(&cmd_ctx
);
3748 unlink(client_unix_sock_path
);
3749 if (client_sock
>= 0) {
3750 ret
= close(client_sock
);
3758 ERR("Health error occurred in %s", __func__
);
3761 health_unregister();
3763 DBG("Client thread dying");
3765 rcu_unregister_thread();
3771 * usage function on stderr
3773 static void usage(void)
3775 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3776 fprintf(stderr
, " -h, --help Display this usage.\n");
3777 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3778 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3779 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3780 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3781 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3782 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3783 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3784 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3785 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3786 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3787 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3788 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3789 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3790 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3791 fprintf(stderr
, " -V, --version Show version number.\n");
3792 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3793 fprintf(stderr
, " -q, --quiet No output at all.\n");
3794 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3795 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3796 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3797 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3801 * daemon argument parsing
3803 static int parse_args(int argc
, char **argv
)
3807 static struct option long_options
[] = {
3808 { "client-sock", 1, 0, 'c' },
3809 { "apps-sock", 1, 0, 'a' },
3810 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3811 { "kconsumerd-err-sock", 1, 0, 'E' },
3812 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3813 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3814 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3815 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3816 { "consumerd32-path", 1, 0, 'u' },
3817 { "consumerd32-libdir", 1, 0, 'U' },
3818 { "consumerd64-path", 1, 0, 't' },
3819 { "consumerd64-libdir", 1, 0, 'T' },
3820 { "daemonize", 0, 0, 'd' },
3821 { "sig-parent", 0, 0, 'S' },
3822 { "help", 0, 0, 'h' },
3823 { "group", 1, 0, 'g' },
3824 { "version", 0, 0, 'V' },
3825 { "quiet", 0, 0, 'q' },
3826 { "verbose", 0, 0, 'v' },
3827 { "verbose-consumer", 0, 0, 'Z' },
3828 { "no-kernel", 0, 0, 'N' },
3829 { "pidfile", 1, 0, 'p' },
3834 int option_index
= 0;
3835 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3836 long_options
, &option_index
);
3843 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3845 fprintf(stderr
, " with arg %s\n", optarg
);
3849 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3852 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3858 opt_tracing_group
= optarg
;
3864 fprintf(stdout
, "%s\n", VERSION
);
3870 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3873 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3876 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3879 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3882 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3885 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3891 lttng_opt_quiet
= 1;
3894 /* Verbose level can increase using multiple -v */
3895 lttng_opt_verbose
+= 1;
3898 opt_verbose_consumer
+= 1;
3901 consumerd32_bin
= optarg
;
3904 consumerd32_libdir
= optarg
;
3907 consumerd64_bin
= optarg
;
3910 consumerd64_libdir
= optarg
;
3913 opt_pidfile
= optarg
;
3916 /* Unknown option or other error.
3917 * Error is printed by getopt, just return */
3926 * Creates the two needed socket by the daemon.
3927 * apps_sock - The communication socket for all UST apps.
3928 * client_sock - The communication of the cli tool (lttng).
3930 static int init_daemon_socket(void)
3935 old_umask
= umask(0);
3937 /* Create client tool unix socket */
3938 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3939 if (client_sock
< 0) {
3940 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3945 /* Set the cloexec flag */
3946 ret
= utils_set_fd_cloexec(client_sock
);
3948 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
3949 "Continuing but note that the consumer daemon will have a "
3950 "reference to this socket on exec()", client_sock
);
3953 /* File permission MUST be 660 */
3954 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3956 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3961 /* Create the application unix socket */
3962 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3963 if (apps_sock
< 0) {
3964 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3969 /* Set the cloexec flag */
3970 ret
= utils_set_fd_cloexec(apps_sock
);
3972 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
3973 "Continuing but note that the consumer daemon will have a "
3974 "reference to this socket on exec()", apps_sock
);
3977 /* File permission MUST be 666 */
3978 ret
= chmod(apps_unix_sock_path
,
3979 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3981 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3986 DBG3("Session daemon client socket %d and application socket %d created",
3987 client_sock
, apps_sock
);
3995 * Check if the global socket is available, and if a daemon is answering at the
3996 * other side. If yes, error is returned.
3998 static int check_existing_daemon(void)
4000 /* Is there anybody out there ? */
4001 if (lttng_session_daemon_alive()) {
4009 * Set the tracing group gid onto the client socket.
4011 * Race window between mkdir and chown is OK because we are going from more
4012 * permissive (root.root) to less permissive (root.tracing).
4014 static int set_permissions(char *rundir
)
4019 ret
= allowed_group();
4021 WARN("No tracing group detected");
4028 /* Set lttng run dir */
4029 ret
= chown(rundir
, 0, gid
);
4031 ERR("Unable to set group on %s", rundir
);
4035 /* Ensure tracing group can search the run dir */
4036 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4038 ERR("Unable to set permissions on %s", rundir
);
4042 /* lttng client socket path */
4043 ret
= chown(client_unix_sock_path
, 0, gid
);
4045 ERR("Unable to set group on %s", client_unix_sock_path
);
4049 /* kconsumer error socket path */
4050 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4052 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4056 /* 64-bit ustconsumer error socket path */
4057 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4059 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4063 /* 32-bit ustconsumer compat32 error socket path */
4064 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4066 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4070 DBG("All permissions are set");
4077 * Create the lttng run directory needed for all global sockets and pipe.
4079 static int create_lttng_rundir(const char *rundir
)
4083 DBG3("Creating LTTng run directory: %s", rundir
);
4085 ret
= mkdir(rundir
, S_IRWXU
);
4087 if (errno
!= EEXIST
) {
4088 ERR("Unable to create %s", rundir
);
4100 * Setup sockets and directory needed by the kconsumerd communication with the
4103 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4107 char path
[PATH_MAX
];
4109 switch (consumer_data
->type
) {
4110 case LTTNG_CONSUMER_KERNEL
:
4111 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4113 case LTTNG_CONSUMER64_UST
:
4114 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4116 case LTTNG_CONSUMER32_UST
:
4117 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4120 ERR("Consumer type unknown");
4125 DBG2("Creating consumer directory: %s", path
);
4127 ret
= mkdir(path
, S_IRWXU
);
4129 if (errno
!= EEXIST
) {
4131 ERR("Failed to create %s", path
);
4137 /* Create the kconsumerd error unix socket */
4138 consumer_data
->err_sock
=
4139 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4140 if (consumer_data
->err_sock
< 0) {
4141 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4146 /* File permission MUST be 660 */
4147 ret
= chmod(consumer_data
->err_unix_sock_path
,
4148 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4150 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4160 * Signal handler for the daemon
4162 * Simply stop all worker threads, leaving main() return gracefully after
4163 * joining all threads and calling cleanup().
4165 static void sighandler(int sig
)
4169 DBG("SIGPIPE caught");
4172 DBG("SIGINT caught");
4176 DBG("SIGTERM caught");
4185 * Setup signal handler for :
4186 * SIGINT, SIGTERM, SIGPIPE
4188 static int set_signal_handler(void)
4191 struct sigaction sa
;
4194 if ((ret
= sigemptyset(&sigset
)) < 0) {
4195 PERROR("sigemptyset");
4199 sa
.sa_handler
= sighandler
;
4200 sa
.sa_mask
= sigset
;
4202 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4203 PERROR("sigaction");
4207 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4208 PERROR("sigaction");
4212 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4213 PERROR("sigaction");
4217 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4223 * Set open files limit to unlimited. This daemon can open a large number of
4224 * file descriptors in order to consumer multiple kernel traces.
4226 static void set_ulimit(void)
4231 /* The kernel does not allowed an infinite limit for open files */
4232 lim
.rlim_cur
= 65535;
4233 lim
.rlim_max
= 65535;
4235 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4237 PERROR("failed to set open files limit");
4242 * Write pidfile using the rundir and opt_pidfile.
4244 static void write_pidfile(void)
4247 char pidfile_path
[PATH_MAX
];
4252 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
4254 /* Build pidfile path from rundir and opt_pidfile. */
4255 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
4256 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
4258 PERROR("snprintf pidfile path");
4264 * Create pid file in rundir. Return value is of no importance. The
4265 * execution will continue even though we are not able to write the file.
4267 (void) utils_create_pid_file(getpid(), pidfile_path
);
4276 int main(int argc
, char **argv
)
4280 const char *home_path
, *env_app_timeout
;
4282 init_kernel_workarounds();
4284 rcu_register_thread();
4286 setup_consumerd_path();
4288 page_size
= sysconf(_SC_PAGESIZE
);
4289 if (page_size
< 0) {
4290 PERROR("sysconf _SC_PAGESIZE");
4291 page_size
= LONG_MAX
;
4292 WARN("Fallback page size to %ld", page_size
);
4295 /* Parse arguments */
4297 if ((ret
= parse_args(argc
, argv
)) < 0) {
4307 * child: setsid, close FD 0, 1, 2, chdir /
4308 * parent: exit (if fork is successful)
4316 * We are in the child. Make sure all other file
4317 * descriptors are closed, in case we are called with
4318 * more opened file descriptors than the standard ones.
4320 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
4325 /* Create thread quit pipe */
4326 if ((ret
= init_thread_quit_pipe()) < 0) {
4330 /* Check if daemon is UID = 0 */
4331 is_root
= !getuid();
4334 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4336 /* Create global run dir with root access */
4337 ret
= create_lttng_rundir(rundir
);
4342 if (strlen(apps_unix_sock_path
) == 0) {
4343 snprintf(apps_unix_sock_path
, PATH_MAX
,
4344 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4347 if (strlen(client_unix_sock_path
) == 0) {
4348 snprintf(client_unix_sock_path
, PATH_MAX
,
4349 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4352 /* Set global SHM for ust */
4353 if (strlen(wait_shm_path
) == 0) {
4354 snprintf(wait_shm_path
, PATH_MAX
,
4355 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4358 if (strlen(health_unix_sock_path
) == 0) {
4359 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4360 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
4363 /* Setup kernel consumerd path */
4364 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4365 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4366 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4367 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4369 DBG2("Kernel consumer err path: %s",
4370 kconsumer_data
.err_unix_sock_path
);
4371 DBG2("Kernel consumer cmd path: %s",
4372 kconsumer_data
.cmd_unix_sock_path
);
4374 home_path
= utils_get_home_dir();
4375 if (home_path
== NULL
) {
4376 /* TODO: Add --socket PATH option */
4377 ERR("Can't get HOME directory for sockets creation.");
4383 * Create rundir from home path. This will create something like
4386 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4392 ret
= create_lttng_rundir(rundir
);
4397 if (strlen(apps_unix_sock_path
) == 0) {
4398 snprintf(apps_unix_sock_path
, PATH_MAX
,
4399 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4402 /* Set the cli tool unix socket path */
4403 if (strlen(client_unix_sock_path
) == 0) {
4404 snprintf(client_unix_sock_path
, PATH_MAX
,
4405 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4408 /* Set global SHM for ust */
4409 if (strlen(wait_shm_path
) == 0) {
4410 snprintf(wait_shm_path
, PATH_MAX
,
4411 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
4414 /* Set health check Unix path */
4415 if (strlen(health_unix_sock_path
) == 0) {
4416 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4417 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4421 /* Set consumer initial state */
4422 kernel_consumerd_state
= CONSUMER_STOPPED
;
4423 ust_consumerd_state
= CONSUMER_STOPPED
;
4425 DBG("Client socket path %s", client_unix_sock_path
);
4426 DBG("Application socket path %s", apps_unix_sock_path
);
4427 DBG("Application wait path %s", wait_shm_path
);
4428 DBG("LTTng run directory path: %s", rundir
);
4430 /* 32 bits consumerd path setup */
4431 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4432 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4433 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4434 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4436 DBG2("UST consumer 32 bits err path: %s",
4437 ustconsumer32_data
.err_unix_sock_path
);
4438 DBG2("UST consumer 32 bits cmd path: %s",
4439 ustconsumer32_data
.cmd_unix_sock_path
);
4441 /* 64 bits consumerd path setup */
4442 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4443 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4444 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4445 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4447 DBG2("UST consumer 64 bits err path: %s",
4448 ustconsumer64_data
.err_unix_sock_path
);
4449 DBG2("UST consumer 64 bits cmd path: %s",
4450 ustconsumer64_data
.cmd_unix_sock_path
);
4453 * See if daemon already exist.
4455 if ((ret
= check_existing_daemon()) < 0) {
4456 ERR("Already running daemon.\n");
4458 * We do not goto exit because we must not cleanup()
4459 * because a daemon is already running.
4465 * Init UST app hash table. Alloc hash table before this point since
4466 * cleanup() can get called after that point.
4470 /* After this point, we can safely call cleanup() with "goto exit" */
4473 * These actions must be executed as root. We do that *after* setting up
4474 * the sockets path because we MUST make the check for another daemon using
4475 * those paths *before* trying to set the kernel consumer sockets and init
4479 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4484 /* Setup kernel tracer */
4485 if (!opt_no_kernel
) {
4486 init_kernel_tracer();
4489 /* Set ulimit for open files */
4492 /* init lttng_fd tracking must be done after set_ulimit. */
4495 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4500 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4505 if ((ret
= set_signal_handler()) < 0) {
4509 /* Setup the needed unix socket */
4510 if ((ret
= init_daemon_socket()) < 0) {
4514 /* Set credentials to socket */
4515 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4519 /* Get parent pid if -S, --sig-parent is specified. */
4520 if (opt_sig_parent
) {
4524 /* Setup the kernel pipe for waking up the kernel thread */
4525 if (is_root
&& !opt_no_kernel
) {
4526 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4531 /* Setup the thread ht_cleanup communication pipe. */
4532 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
4536 /* Setup the thread apps communication pipe. */
4537 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4541 /* Setup the thread apps notify communication pipe. */
4542 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
4546 /* Initialize global buffer per UID and PID registry. */
4547 buffer_reg_init_uid_registry();
4548 buffer_reg_init_pid_registry();
4550 /* Init UST command queue. */
4551 cds_wfq_init(&ust_cmd_queue
.queue
);
4554 * Get session list pointer. This pointer MUST NOT be free(). This list is
4555 * statically declared in session.c
4557 session_list_ptr
= session_get_list();
4559 /* Set up max poll set size */
4560 lttng_poll_set_max_size();
4564 /* Check for the application socket timeout env variable. */
4565 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4566 if (env_app_timeout
) {
4567 app_socket_timeout
= atoi(env_app_timeout
);
4569 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4574 /* Create thread to manage the client socket */
4575 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
4576 thread_ht_cleanup
, (void *) NULL
);
4578 PERROR("pthread_create ht_cleanup");
4579 goto exit_ht_cleanup
;
4582 /* Create thread to manage the client socket */
4583 ret
= pthread_create(&health_thread
, NULL
,
4584 thread_manage_health
, (void *) NULL
);
4586 PERROR("pthread_create health");
4590 /* Create thread to manage the client socket */
4591 ret
= pthread_create(&client_thread
, NULL
,
4592 thread_manage_clients
, (void *) NULL
);
4594 PERROR("pthread_create clients");
4598 /* Create thread to dispatch registration */
4599 ret
= pthread_create(&dispatch_thread
, NULL
,
4600 thread_dispatch_ust_registration
, (void *) NULL
);
4602 PERROR("pthread_create dispatch");
4606 /* Create thread to manage application registration. */
4607 ret
= pthread_create(®_apps_thread
, NULL
,
4608 thread_registration_apps
, (void *) NULL
);
4610 PERROR("pthread_create registration");
4614 /* Create thread to manage application socket */
4615 ret
= pthread_create(&apps_thread
, NULL
,
4616 thread_manage_apps
, (void *) NULL
);
4618 PERROR("pthread_create apps");
4622 /* Create thread to manage application notify socket */
4623 ret
= pthread_create(&apps_notify_thread
, NULL
,
4624 ust_thread_manage_notify
, (void *) NULL
);
4626 PERROR("pthread_create apps");
4630 /* Don't start this thread if kernel tracing is not requested nor root */
4631 if (is_root
&& !opt_no_kernel
) {
4632 /* Create kernel thread to manage kernel event */
4633 ret
= pthread_create(&kernel_thread
, NULL
,
4634 thread_manage_kernel
, (void *) NULL
);
4636 PERROR("pthread_create kernel");
4640 ret
= pthread_join(kernel_thread
, &status
);
4642 PERROR("pthread_join");
4643 goto error
; /* join error, exit without cleanup */
4648 ret
= pthread_join(apps_thread
, &status
);
4650 PERROR("pthread_join");
4651 goto error
; /* join error, exit without cleanup */
4655 ret
= pthread_join(reg_apps_thread
, &status
);
4657 PERROR("pthread_join");
4658 goto error
; /* join error, exit without cleanup */
4662 ret
= pthread_join(dispatch_thread
, &status
);
4664 PERROR("pthread_join");
4665 goto error
; /* join error, exit without cleanup */
4669 ret
= pthread_join(client_thread
, &status
);
4671 PERROR("pthread_join");
4672 goto error
; /* join error, exit without cleanup */
4675 ret
= join_consumer_thread(&kconsumer_data
);
4677 PERROR("join_consumer");
4678 goto error
; /* join error, exit without cleanup */
4681 ret
= join_consumer_thread(&ustconsumer32_data
);
4683 PERROR("join_consumer ust32");
4684 goto error
; /* join error, exit without cleanup */
4687 ret
= join_consumer_thread(&ustconsumer64_data
);
4689 PERROR("join_consumer ust64");
4690 goto error
; /* join error, exit without cleanup */
4694 ret
= pthread_join(health_thread
, &status
);
4696 PERROR("pthread_join health thread");
4697 goto error
; /* join error, exit without cleanup */
4701 ret
= pthread_join(ht_cleanup_thread
, &status
);
4703 PERROR("pthread_join ht cleanup thread");
4704 goto error
; /* join error, exit without cleanup */
4709 * cleanup() is called when no other thread is running.
4711 rcu_thread_online();
4713 rcu_thread_offline();
4714 rcu_unregister_thread();