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"
63 #include "health-sessiond.h"
64 #include "testpoint.h"
65 #include "ust-thread.h"
67 #define CONSUMERD_FILE "lttng-consumerd"
70 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
73 const char *opt_tracing_group
;
74 static const char *opt_pidfile
;
75 static int opt_sig_parent
;
76 static int opt_verbose_consumer
;
77 static int opt_daemon
;
78 static int opt_no_kernel
;
79 static int is_root
; /* Set to 1 if the daemon is running as root */
80 static pid_t ppid
; /* Parent PID for --sig-parent option */
84 * Consumer daemon specific control data. Every value not initialized here is
85 * set to 0 by the static definition.
87 static struct consumer_data kconsumer_data
= {
88 .type
= LTTNG_CONSUMER_KERNEL
,
89 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
90 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
93 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
94 .lock
= PTHREAD_MUTEX_INITIALIZER
,
95 .cond
= PTHREAD_COND_INITIALIZER
,
96 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
98 static struct consumer_data ustconsumer64_data
= {
99 .type
= LTTNG_CONSUMER64_UST
,
100 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
101 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
104 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
105 .lock
= PTHREAD_MUTEX_INITIALIZER
,
106 .cond
= PTHREAD_COND_INITIALIZER
,
107 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
109 static struct consumer_data ustconsumer32_data
= {
110 .type
= LTTNG_CONSUMER32_UST
,
111 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
115 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
116 .lock
= PTHREAD_MUTEX_INITIALIZER
,
117 .cond
= PTHREAD_COND_INITIALIZER
,
118 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
121 /* Shared between threads */
122 static int dispatch_thread_exit
;
124 /* Global application Unix socket path */
125 static char apps_unix_sock_path
[PATH_MAX
];
126 /* Global client Unix socket path */
127 static char client_unix_sock_path
[PATH_MAX
];
128 /* global wait shm path for UST */
129 static char wait_shm_path
[PATH_MAX
];
130 /* Global health check unix path */
131 static char health_unix_sock_path
[PATH_MAX
];
133 /* Sockets and FDs */
134 static int client_sock
= -1;
135 static int apps_sock
= -1;
136 int kernel_tracer_fd
= -1;
137 static int kernel_poll_pipe
[2] = { -1, -1 };
140 * Quit pipe for all threads. This permits a single cancellation point
141 * for all threads when receiving an event on the pipe.
143 static int thread_quit_pipe
[2] = { -1, -1 };
146 * This pipe is used to inform the thread managing application communication
147 * that a command is queued and ready to be processed.
149 static int apps_cmd_pipe
[2] = { -1, -1 };
151 int apps_cmd_notify_pipe
[2] = { -1, -1 };
153 /* Pthread, Mutexes and Semaphores */
154 static pthread_t apps_thread
;
155 static pthread_t apps_notify_thread
;
156 static pthread_t reg_apps_thread
;
157 static pthread_t client_thread
;
158 static pthread_t kernel_thread
;
159 static pthread_t dispatch_thread
;
160 static pthread_t health_thread
;
161 static pthread_t ht_cleanup_thread
;
164 * UST registration command queue. This queue is tied with a futex and uses a N
165 * wakers / 1 waiter implemented and detailed in futex.c/.h
167 * The thread_manage_apps and thread_dispatch_ust_registration interact with
168 * this queue and the wait/wake scheme.
170 static struct ust_cmd_queue ust_cmd_queue
;
173 * Pointer initialized before thread creation.
175 * This points to the tracing session list containing the session count and a
176 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
177 * MUST NOT be taken if you call a public function in session.c.
179 * The lock is nested inside the structure: session_list_ptr->lock. Please use
180 * session_lock_list and session_unlock_list for lock acquisition.
182 static struct ltt_session_list
*session_list_ptr
;
184 int ust_consumerd64_fd
= -1;
185 int ust_consumerd32_fd
= -1;
187 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
188 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
189 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
190 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
192 static const char *module_proc_lttng
= "/proc/lttng";
195 * Consumer daemon state which is changed when spawning it, killing it or in
196 * case of a fatal error.
198 enum consumerd_state
{
199 CONSUMER_STARTED
= 1,
200 CONSUMER_STOPPED
= 2,
205 * This consumer daemon state is used to validate if a client command will be
206 * able to reach the consumer. If not, the client is informed. For instance,
207 * doing a "lttng start" when the consumer state is set to ERROR will return an
208 * error to the client.
210 * The following example shows a possible race condition of this scheme:
212 * consumer thread error happens
214 * client cmd checks state -> still OK
215 * consumer thread exit, sets error
216 * client cmd try to talk to consumer
219 * However, since the consumer is a different daemon, we have no way of making
220 * sure the command will reach it safely even with this state flag. This is why
221 * we consider that up to the state validation during command processing, the
222 * command is safe. After that, we can not guarantee the correctness of the
223 * client request vis-a-vis the consumer.
225 static enum consumerd_state ust_consumerd_state
;
226 static enum consumerd_state kernel_consumerd_state
;
229 * Socket timeout for receiving and sending in seconds.
231 static int app_socket_timeout
;
233 /* Set in main() with the current page size. */
236 /* Application health monitoring */
237 struct health_app
*health_sessiond
;
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 consumerd32 err_sock close");
412 if (ustconsumer64_data
.err_sock
>= 0) {
413 ret
= close(ustconsumer64_data
.err_sock
);
415 PERROR("UST consumerd64 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 consumerd32 cmd_sock close");
430 if (ustconsumer64_data
.cmd_sock
>= 0) {
431 ret
= close(ustconsumer64_data
.cmd_sock
);
433 PERROR("UST consumerd64 cmd_sock close");
441 static void cleanup(void)
445 struct ltt_session
*sess
, *stmp
;
450 * Close the thread quit pipe. It has already done its job,
451 * since we are now called.
453 utils_close_pipe(thread_quit_pipe
);
456 * If opt_pidfile is undefined, the default file will be wiped when
457 * removing the rundir.
460 ret
= remove(opt_pidfile
);
462 PERROR("remove pidfile %s", opt_pidfile
);
466 DBG("Removing %s directory", rundir
);
467 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
469 ERR("asprintf failed. Something is really wrong!");
472 /* Remove lttng run directory */
475 ERR("Unable to clean %s", rundir
);
480 DBG("Cleaning up all sessions");
482 /* Destroy session list mutex */
483 if (session_list_ptr
!= NULL
) {
484 pthread_mutex_destroy(&session_list_ptr
->lock
);
486 /* Cleanup ALL session */
487 cds_list_for_each_entry_safe(sess
, stmp
,
488 &session_list_ptr
->head
, list
) {
489 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
493 DBG("Closing all UST sockets");
494 ust_app_clean_list();
495 buffer_reg_destroy_registries();
497 if (is_root
&& !opt_no_kernel
) {
498 DBG2("Closing kernel fd");
499 if (kernel_tracer_fd
>= 0) {
500 ret
= close(kernel_tracer_fd
);
505 DBG("Unloading kernel modules");
506 modprobe_remove_lttng_all();
509 close_consumer_sockets();
512 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
513 "Matthew, BEET driven development works!%c[%dm",
514 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
519 * Send data on a unix socket using the liblttsessiondcomm API.
521 * Return lttcomm error code.
523 static int send_unix_sock(int sock
, void *buf
, size_t len
)
525 /* Check valid length */
530 return lttcomm_send_unix_sock(sock
, buf
, len
);
534 * Free memory of a command context structure.
536 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
538 DBG("Clean command context structure");
540 if ((*cmd_ctx
)->llm
) {
541 free((*cmd_ctx
)->llm
);
543 if ((*cmd_ctx
)->lsm
) {
544 free((*cmd_ctx
)->lsm
);
552 * Notify UST applications using the shm mmap futex.
554 static int notify_ust_apps(int active
)
558 DBG("Notifying applications of session daemon state: %d", active
);
560 /* See shm.c for this call implying mmap, shm and futex calls */
561 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
562 if (wait_shm_mmap
== NULL
) {
566 /* Wake waiting process */
567 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
569 /* Apps notified successfully */
577 * Setup the outgoing data buffer for the response (llm) by allocating the
578 * right amount of memory and copying the original information from the lsm
581 * Return total size of the buffer pointed by buf.
583 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
589 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
590 if (cmd_ctx
->llm
== NULL
) {
596 /* Copy common data */
597 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
598 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
600 cmd_ctx
->llm
->data_size
= size
;
601 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
610 * Update the kernel poll set of all channel fd available over all tracing
611 * session. Add the wakeup pipe at the end of the set.
613 static int update_kernel_poll(struct lttng_poll_event
*events
)
616 struct ltt_session
*session
;
617 struct ltt_kernel_channel
*channel
;
619 DBG("Updating kernel poll set");
622 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
623 session_lock(session
);
624 if (session
->kernel_session
== NULL
) {
625 session_unlock(session
);
629 cds_list_for_each_entry(channel
,
630 &session
->kernel_session
->channel_list
.head
, list
) {
631 /* Add channel fd to the kernel poll set */
632 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
634 session_unlock(session
);
637 DBG("Channel fd %d added to kernel set", channel
->fd
);
639 session_unlock(session
);
641 session_unlock_list();
646 session_unlock_list();
651 * Find the channel fd from 'fd' over all tracing session. When found, check
652 * for new channel stream and send those stream fds to the kernel consumer.
654 * Useful for CPU hotplug feature.
656 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
659 struct ltt_session
*session
;
660 struct ltt_kernel_session
*ksess
;
661 struct ltt_kernel_channel
*channel
;
663 DBG("Updating kernel streams for channel fd %d", fd
);
666 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
667 session_lock(session
);
668 if (session
->kernel_session
== NULL
) {
669 session_unlock(session
);
672 ksess
= session
->kernel_session
;
674 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
675 if (channel
->fd
== fd
) {
676 DBG("Channel found, updating kernel streams");
677 ret
= kernel_open_channel_stream(channel
);
681 /* Update the stream global counter */
682 ksess
->stream_count_global
+= ret
;
685 * Have we already sent fds to the consumer? If yes, it means
686 * that tracing is started so it is safe to send our updated
689 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
690 struct lttng_ht_iter iter
;
691 struct consumer_socket
*socket
;
694 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
695 &iter
.iter
, socket
, node
.node
) {
696 pthread_mutex_lock(socket
->lock
);
697 ret
= kernel_consumer_send_channel_stream(socket
,
699 session
->output_traces
? 1 : 0);
700 pthread_mutex_unlock(socket
->lock
);
711 session_unlock(session
);
713 session_unlock_list();
717 session_unlock(session
);
718 session_unlock_list();
723 * For each tracing session, update newly registered apps. The session list
724 * lock MUST be acquired before calling this.
726 static void update_ust_app(int app_sock
)
728 struct ltt_session
*sess
, *stmp
;
730 /* Consumer is in an ERROR state. Stop any application update. */
731 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
732 /* Stop the update process since the consumer is dead. */
736 /* For all tracing session(s) */
737 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
739 if (sess
->ust_session
) {
740 ust_app_global_update(sess
->ust_session
, app_sock
);
742 session_unlock(sess
);
747 * This thread manage event coming from the kernel.
749 * Features supported in this thread:
752 static void *thread_manage_kernel(void *data
)
754 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
755 uint32_t revents
, nb_fd
;
757 struct lttng_poll_event events
;
759 DBG("[thread] Thread manage kernel started");
761 health_register(health_sessiond
, HEALTH_TYPE_KERNEL
);
764 * This first step of the while is to clean this structure which could free
765 * non NULL pointers so initialize it before the loop.
767 lttng_poll_init(&events
);
769 if (testpoint(thread_manage_kernel
)) {
770 goto error_testpoint
;
773 health_code_update();
775 if (testpoint(thread_manage_kernel_before_loop
)) {
776 goto error_testpoint
;
780 health_code_update();
782 if (update_poll_flag
== 1) {
783 /* Clean events object. We are about to populate it again. */
784 lttng_poll_clean(&events
);
786 ret
= sessiond_set_thread_pollset(&events
, 2);
788 goto error_poll_create
;
791 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
796 /* This will add the available kernel channel if any. */
797 ret
= update_kernel_poll(&events
);
801 update_poll_flag
= 0;
804 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
806 /* Poll infinite value of time */
809 ret
= lttng_poll_wait(&events
, -1);
813 * Restart interrupted system call.
815 if (errno
== EINTR
) {
819 } else if (ret
== 0) {
820 /* Should not happen since timeout is infinite */
821 ERR("Return value of poll is 0 with an infinite timeout.\n"
822 "This should not have happened! Continuing...");
828 for (i
= 0; i
< nb_fd
; i
++) {
829 /* Fetch once the poll data */
830 revents
= LTTNG_POLL_GETEV(&events
, i
);
831 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
833 health_code_update();
835 /* Thread quit pipe has been closed. Killing thread. */
836 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
842 /* Check for data on kernel pipe */
843 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
845 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
846 } while (ret
< 0 && errno
== EINTR
);
848 * Ret value is useless here, if this pipe gets any actions an
849 * update is required anyway.
851 update_poll_flag
= 1;
855 * New CPU detected by the kernel. Adding kernel stream to
856 * kernel session and updating the kernel consumer
858 if (revents
& LPOLLIN
) {
859 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
865 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
866 * and unregister kernel stream at this point.
875 lttng_poll_clean(&events
);
878 utils_close_pipe(kernel_poll_pipe
);
879 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
882 ERR("Health error occurred in %s", __func__
);
883 WARN("Kernel thread died unexpectedly. "
884 "Kernel tracing can continue but CPU hotplug is disabled.");
886 health_unregister(health_sessiond
);
887 DBG("Kernel thread dying");
892 * Signal pthread condition of the consumer data that the thread.
894 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
896 pthread_mutex_lock(&data
->cond_mutex
);
899 * The state is set before signaling. It can be any value, it's the waiter
900 * job to correctly interpret this condition variable associated to the
901 * consumer pthread_cond.
903 * A value of 0 means that the corresponding thread of the consumer data
904 * was not started. 1 indicates that the thread has started and is ready
905 * for action. A negative value means that there was an error during the
908 data
->consumer_thread_is_ready
= state
;
909 (void) pthread_cond_signal(&data
->cond
);
911 pthread_mutex_unlock(&data
->cond_mutex
);
915 * This thread manage the consumer error sent back to the session daemon.
917 static void *thread_manage_consumer(void *data
)
919 int sock
= -1, i
, ret
, pollfd
, err
= -1;
920 uint32_t revents
, nb_fd
;
921 enum lttcomm_return_code code
;
922 struct lttng_poll_event events
;
923 struct consumer_data
*consumer_data
= data
;
925 DBG("[thread] Manage consumer started");
927 health_register(health_sessiond
, HEALTH_TYPE_CONSUMER
);
929 health_code_update();
932 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
933 * metadata_sock. Nothing more will be added to this poll set.
935 ret
= sessiond_set_thread_pollset(&events
, 3);
941 * The error socket here is already in a listening state which was done
942 * just before spawning this thread to avoid a race between the consumer
943 * daemon exec trying to connect and the listen() call.
945 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
950 health_code_update();
952 /* Infinite blocking call, waiting for transmission */
956 if (testpoint(thread_manage_consumer
)) {
960 ret
= lttng_poll_wait(&events
, -1);
964 * Restart interrupted system call.
966 if (errno
== EINTR
) {
974 for (i
= 0; i
< nb_fd
; i
++) {
975 /* Fetch once the poll data */
976 revents
= LTTNG_POLL_GETEV(&events
, i
);
977 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
979 health_code_update();
981 /* Thread quit pipe has been closed. Killing thread. */
982 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
988 /* Event on the registration socket */
989 if (pollfd
== consumer_data
->err_sock
) {
990 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
991 ERR("consumer err socket poll error");
997 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1003 * Set the CLOEXEC flag. Return code is useless because either way, the
1006 (void) utils_set_fd_cloexec(sock
);
1008 health_code_update();
1010 DBG2("Receiving code from consumer err_sock");
1012 /* Getting status code from kconsumerd */
1013 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1014 sizeof(enum lttcomm_return_code
));
1019 health_code_update();
1021 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1022 /* Connect both socket, command and metadata. */
1023 consumer_data
->cmd_sock
=
1024 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1025 consumer_data
->metadata_fd
=
1026 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1027 if (consumer_data
->cmd_sock
< 0
1028 || consumer_data
->metadata_fd
< 0) {
1029 PERROR("consumer connect cmd socket");
1030 /* On error, signal condition and quit. */
1031 signal_consumer_condition(consumer_data
, -1);
1034 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1035 /* Create metadata socket lock. */
1036 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1037 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1038 PERROR("zmalloc pthread mutex");
1042 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1044 signal_consumer_condition(consumer_data
, 1);
1045 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1046 DBG("Consumer metadata socket ready (fd: %d)",
1047 consumer_data
->metadata_fd
);
1049 ERR("consumer error when waiting for SOCK_READY : %s",
1050 lttcomm_get_readable_code(-code
));
1054 /* Remove the consumerd error sock since we've established a connexion */
1055 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1060 /* Add new accepted error socket. */
1061 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1066 /* Add metadata socket that is successfully connected. */
1067 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1068 LPOLLIN
| LPOLLRDHUP
);
1073 health_code_update();
1075 /* Infinite blocking call, waiting for transmission */
1078 health_poll_entry();
1079 ret
= lttng_poll_wait(&events
, -1);
1083 * Restart interrupted system call.
1085 if (errno
== EINTR
) {
1093 for (i
= 0; i
< nb_fd
; i
++) {
1094 /* Fetch once the poll data */
1095 revents
= LTTNG_POLL_GETEV(&events
, i
);
1096 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1098 health_code_update();
1100 /* Thread quit pipe has been closed. Killing thread. */
1101 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1107 if (pollfd
== sock
) {
1108 /* Event on the consumerd socket */
1109 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1110 ERR("consumer err socket second poll error");
1113 health_code_update();
1114 /* Wait for any kconsumerd error */
1115 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1116 sizeof(enum lttcomm_return_code
));
1118 ERR("consumer closed the command socket");
1122 ERR("consumer return code : %s",
1123 lttcomm_get_readable_code(-code
));
1126 } else if (pollfd
== consumer_data
->metadata_fd
) {
1127 /* UST metadata requests */
1128 ret
= ust_consumer_metadata_request(
1129 &consumer_data
->metadata_sock
);
1131 ERR("Handling metadata request");
1136 ERR("Unknown pollfd");
1140 health_code_update();
1146 * We lock here because we are about to close the sockets and some other
1147 * thread might be using them so get exclusive access which will abort all
1148 * other consumer command by other threads.
1150 pthread_mutex_lock(&consumer_data
->lock
);
1152 /* Immediately set the consumerd state to stopped */
1153 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1154 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1155 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1156 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1157 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1159 /* Code flow error... */
1163 if (consumer_data
->err_sock
>= 0) {
1164 ret
= close(consumer_data
->err_sock
);
1168 consumer_data
->err_sock
= -1;
1170 if (consumer_data
->cmd_sock
>= 0) {
1171 ret
= close(consumer_data
->cmd_sock
);
1175 consumer_data
->cmd_sock
= -1;
1177 if (*consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1178 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1191 unlink(consumer_data
->err_unix_sock_path
);
1192 unlink(consumer_data
->cmd_unix_sock_path
);
1193 consumer_data
->pid
= 0;
1194 pthread_mutex_unlock(&consumer_data
->lock
);
1196 /* Cleanup metadata socket mutex. */
1197 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1198 free(consumer_data
->metadata_sock
.lock
);
1200 lttng_poll_clean(&events
);
1204 ERR("Health error occurred in %s", __func__
);
1206 health_unregister(health_sessiond
);
1207 DBG("consumer thread cleanup completed");
1213 * This thread manage application communication.
1215 static void *thread_manage_apps(void *data
)
1217 int i
, ret
, pollfd
, err
= -1;
1218 uint32_t revents
, nb_fd
;
1219 struct lttng_poll_event events
;
1221 DBG("[thread] Manage application started");
1223 rcu_register_thread();
1224 rcu_thread_online();
1226 health_register(health_sessiond
, HEALTH_TYPE_APP_MANAGE
);
1228 if (testpoint(thread_manage_apps
)) {
1229 goto error_testpoint
;
1232 health_code_update();
1234 ret
= sessiond_set_thread_pollset(&events
, 2);
1236 goto error_poll_create
;
1239 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1244 if (testpoint(thread_manage_apps_before_loop
)) {
1248 health_code_update();
1251 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1253 /* Inifinite blocking call, waiting for transmission */
1255 health_poll_entry();
1256 ret
= lttng_poll_wait(&events
, -1);
1260 * Restart interrupted system call.
1262 if (errno
== EINTR
) {
1270 for (i
= 0; i
< nb_fd
; i
++) {
1271 /* Fetch once the poll data */
1272 revents
= LTTNG_POLL_GETEV(&events
, i
);
1273 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1275 health_code_update();
1277 /* Thread quit pipe has been closed. Killing thread. */
1278 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1284 /* Inspect the apps cmd pipe */
1285 if (pollfd
== apps_cmd_pipe
[0]) {
1286 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1287 ERR("Apps command pipe error");
1289 } else if (revents
& LPOLLIN
) {
1294 ret
= read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1295 } while (ret
< 0 && errno
== EINTR
);
1296 if (ret
< 0 || ret
< sizeof(sock
)) {
1297 PERROR("read apps cmd pipe");
1301 health_code_update();
1304 * We only monitor the error events of the socket. This
1305 * thread does not handle any incoming data from UST
1308 ret
= lttng_poll_add(&events
, sock
,
1309 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1315 * Set socket timeout for both receiving and ending.
1316 * app_socket_timeout is in seconds, whereas
1317 * lttcomm_setsockopt_rcv_timeout and
1318 * lttcomm_setsockopt_snd_timeout expect msec as
1321 (void) lttcomm_setsockopt_rcv_timeout(sock
,
1322 app_socket_timeout
* 1000);
1323 (void) lttcomm_setsockopt_snd_timeout(sock
,
1324 app_socket_timeout
* 1000);
1326 DBG("Apps with sock %d added to poll set", sock
);
1328 health_code_update();
1334 * At this point, we know that a registered application made
1335 * the event at poll_wait.
1337 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1338 /* Removing from the poll set */
1339 ret
= lttng_poll_del(&events
, pollfd
);
1344 /* Socket closed on remote end. */
1345 ust_app_unregister(pollfd
);
1350 health_code_update();
1356 lttng_poll_clean(&events
);
1359 utils_close_pipe(apps_cmd_pipe
);
1360 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1363 * We don't clean the UST app hash table here since already registered
1364 * applications can still be controlled so let them be until the session
1365 * daemon dies or the applications stop.
1370 ERR("Health error occurred in %s", __func__
);
1372 health_unregister(health_sessiond
);
1373 DBG("Application communication apps thread cleanup complete");
1374 rcu_thread_offline();
1375 rcu_unregister_thread();
1380 * Send a socket to a thread This is called from the dispatch UST registration
1381 * thread once all sockets are set for the application.
1383 * The sock value can be invalid, we don't really care, the thread will handle
1384 * it and make the necessary cleanup if so.
1386 * On success, return 0 else a negative value being the errno message of the
1389 static int send_socket_to_thread(int fd
, int sock
)
1394 * It's possible that the FD is set as invalid with -1 concurrently just
1395 * before calling this function being a shutdown state of the thread.
1403 ret
= write(fd
, &sock
, sizeof(sock
));
1404 } while (ret
< 0 && errno
== EINTR
);
1405 if (ret
< 0 || ret
!= sizeof(sock
)) {
1406 PERROR("write apps pipe %d", fd
);
1413 /* All good. Don't send back the write positive ret value. */
1420 * Sanitize the wait queue of the dispatch registration thread meaning removing
1421 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1422 * notify socket is never received.
1424 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1426 int ret
, nb_fd
= 0, i
;
1427 unsigned int fd_added
= 0;
1428 struct lttng_poll_event events
;
1429 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1433 lttng_poll_init(&events
);
1435 /* Just skip everything for an empty queue. */
1436 if (!wait_queue
->count
) {
1440 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1445 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1446 &wait_queue
->head
, head
) {
1447 assert(wait_node
->app
);
1448 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1449 LPOLLHUP
| LPOLLERR
);
1462 * Poll but don't block so we can quickly identify the faulty events and
1463 * clean them afterwards from the wait queue.
1465 ret
= lttng_poll_wait(&events
, 0);
1471 for (i
= 0; i
< nb_fd
; i
++) {
1472 /* Get faulty FD. */
1473 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1474 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1476 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1477 &wait_queue
->head
, head
) {
1478 if (pollfd
== wait_node
->app
->sock
&&
1479 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1480 cds_list_del(&wait_node
->head
);
1481 wait_queue
->count
--;
1482 ust_app_destroy(wait_node
->app
);
1490 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1494 lttng_poll_clean(&events
);
1498 lttng_poll_clean(&events
);
1500 ERR("Unable to sanitize wait queue");
1505 * Dispatch request from the registration threads to the application
1506 * communication thread.
1508 static void *thread_dispatch_ust_registration(void *data
)
1511 struct cds_wfq_node
*node
;
1512 struct ust_command
*ust_cmd
= NULL
;
1513 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1514 struct ust_reg_wait_queue wait_queue
= {
1518 health_register(health_sessiond
, HEALTH_TYPE_APP_REG_DISPATCH
);
1520 health_code_update();
1522 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1524 DBG("[thread] Dispatch UST command started");
1526 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1527 health_code_update();
1529 /* Atomically prepare the queue futex */
1530 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1533 struct ust_app
*app
= NULL
;
1537 * Make sure we don't have node(s) that have hung up before receiving
1538 * the notify socket. This is to clean the list in order to avoid
1539 * memory leaks from notify socket that are never seen.
1541 sanitize_wait_queue(&wait_queue
);
1543 health_code_update();
1544 /* Dequeue command for registration */
1545 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1547 DBG("Woken up but nothing in the UST command queue");
1548 /* Continue thread execution */
1552 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1554 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1555 " gid:%d sock:%d name:%s (version %d.%d)",
1556 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1557 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1558 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1559 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1561 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1562 wait_node
= zmalloc(sizeof(*wait_node
));
1564 PERROR("zmalloc wait_node dispatch");
1565 ret
= close(ust_cmd
->sock
);
1567 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1569 lttng_fd_put(1, LTTNG_FD_APPS
);
1573 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1575 /* Create application object if socket is CMD. */
1576 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1578 if (!wait_node
->app
) {
1579 ret
= close(ust_cmd
->sock
);
1581 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1583 lttng_fd_put(1, LTTNG_FD_APPS
);
1589 * Add application to the wait queue so we can set the notify
1590 * socket before putting this object in the global ht.
1592 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1597 * We have to continue here since we don't have the notify
1598 * socket and the application MUST be added to the hash table
1599 * only at that moment.
1604 * Look for the application in the local wait queue and set the
1605 * notify socket if found.
1607 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1608 &wait_queue
.head
, head
) {
1609 health_code_update();
1610 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1611 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1612 cds_list_del(&wait_node
->head
);
1614 app
= wait_node
->app
;
1616 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1622 * With no application at this stage the received socket is
1623 * basically useless so close it before we free the cmd data
1624 * structure for good.
1627 ret
= close(ust_cmd
->sock
);
1629 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1631 lttng_fd_put(1, LTTNG_FD_APPS
);
1638 * @session_lock_list
1640 * Lock the global session list so from the register up to the
1641 * registration done message, no thread can see the application
1642 * and change its state.
1644 session_lock_list();
1648 * Add application to the global hash table. This needs to be
1649 * done before the update to the UST registry can locate the
1654 /* Set app version. This call will print an error if needed. */
1655 (void) ust_app_version(app
);
1657 /* Send notify socket through the notify pipe. */
1658 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1662 session_unlock_list();
1664 * No notify thread, stop the UST tracing. However, this is
1665 * not an internal error of the this thread thus setting
1666 * the health error code to a normal exit.
1673 * Update newly registered application with the tracing
1674 * registry info already enabled information.
1676 update_ust_app(app
->sock
);
1679 * Don't care about return value. Let the manage apps threads
1680 * handle app unregistration upon socket close.
1682 (void) ust_app_register_done(app
->sock
);
1685 * Even if the application socket has been closed, send the app
1686 * to the thread and unregistration will take place at that
1689 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1692 session_unlock_list();
1694 * No apps. thread, stop the UST tracing. However, this is
1695 * not an internal error of the this thread thus setting
1696 * the health error code to a normal exit.
1703 session_unlock_list();
1705 } while (node
!= NULL
);
1707 health_poll_entry();
1708 /* Futex wait on queue. Blocking call on futex() */
1709 futex_nto1_wait(&ust_cmd_queue
.futex
);
1712 /* Normal exit, no error */
1716 /* Clean up wait queue. */
1717 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1718 &wait_queue
.head
, head
) {
1719 cds_list_del(&wait_node
->head
);
1724 DBG("Dispatch thread dying");
1727 ERR("Health error occurred in %s", __func__
);
1729 health_unregister(health_sessiond
);
1734 * This thread manage application registration.
1736 static void *thread_registration_apps(void *data
)
1738 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1739 uint32_t revents
, nb_fd
;
1740 struct lttng_poll_event events
;
1742 * Get allocated in this thread, enqueued to a global queue, dequeued and
1743 * freed in the manage apps thread.
1745 struct ust_command
*ust_cmd
= NULL
;
1747 DBG("[thread] Manage application registration started");
1749 health_register(health_sessiond
, HEALTH_TYPE_APP_REG
);
1751 if (testpoint(thread_registration_apps
)) {
1752 goto error_testpoint
;
1755 ret
= lttcomm_listen_unix_sock(apps_sock
);
1761 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1762 * more will be added to this poll set.
1764 ret
= sessiond_set_thread_pollset(&events
, 2);
1766 goto error_create_poll
;
1769 /* Add the application registration socket */
1770 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1772 goto error_poll_add
;
1775 /* Notify all applications to register */
1776 ret
= notify_ust_apps(1);
1778 ERR("Failed to notify applications or create the wait shared memory.\n"
1779 "Execution continues but there might be problem for already\n"
1780 "running applications that wishes to register.");
1784 DBG("Accepting application registration");
1786 /* Inifinite blocking call, waiting for transmission */
1788 health_poll_entry();
1789 ret
= lttng_poll_wait(&events
, -1);
1793 * Restart interrupted system call.
1795 if (errno
== EINTR
) {
1803 for (i
= 0; i
< nb_fd
; i
++) {
1804 health_code_update();
1806 /* Fetch once the poll data */
1807 revents
= LTTNG_POLL_GETEV(&events
, i
);
1808 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1810 /* Thread quit pipe has been closed. Killing thread. */
1811 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1817 /* Event on the registration socket */
1818 if (pollfd
== apps_sock
) {
1819 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1820 ERR("Register apps socket poll error");
1822 } else if (revents
& LPOLLIN
) {
1823 sock
= lttcomm_accept_unix_sock(apps_sock
);
1829 * Set the CLOEXEC flag. Return code is useless because
1830 * either way, the show must go on.
1832 (void) utils_set_fd_cloexec(sock
);
1834 /* Create UST registration command for enqueuing */
1835 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1836 if (ust_cmd
== NULL
) {
1837 PERROR("ust command zmalloc");
1842 * Using message-based transmissions to ensure we don't
1843 * have to deal with partially received messages.
1845 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1847 ERR("Exhausted file descriptors allowed for applications.");
1857 health_code_update();
1858 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
1861 /* Close socket of the application. */
1866 lttng_fd_put(LTTNG_FD_APPS
, 1);
1870 health_code_update();
1872 ust_cmd
->sock
= sock
;
1875 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1876 " gid:%d sock:%d name:%s (version %d.%d)",
1877 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1878 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1879 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1880 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1883 * Lock free enqueue the registration request. The red pill
1884 * has been taken! This apps will be part of the *system*.
1886 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1889 * Wake the registration queue futex. Implicit memory
1890 * barrier with the exchange in cds_wfq_enqueue.
1892 futex_nto1_wake(&ust_cmd_queue
.futex
);
1902 ERR("Health error occurred in %s", __func__
);
1905 /* Notify that the registration thread is gone */
1908 if (apps_sock
>= 0) {
1909 ret
= close(apps_sock
);
1919 lttng_fd_put(LTTNG_FD_APPS
, 1);
1921 unlink(apps_unix_sock_path
);
1924 lttng_poll_clean(&events
);
1928 DBG("UST Registration thread cleanup complete");
1929 health_unregister(health_sessiond
);
1935 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1936 * exec or it will fails.
1938 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1941 struct timespec timeout
;
1943 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1944 consumer_data
->consumer_thread_is_ready
= 0;
1946 /* Setup pthread condition */
1947 ret
= pthread_condattr_init(&consumer_data
->condattr
);
1950 PERROR("pthread_condattr_init consumer data");
1955 * Set the monotonic clock in order to make sure we DO NOT jump in time
1956 * between the clock_gettime() call and the timedwait call. See bug #324
1957 * for a more details and how we noticed it.
1959 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
1962 PERROR("pthread_condattr_setclock consumer data");
1966 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
1969 PERROR("pthread_cond_init consumer data");
1973 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
1976 PERROR("pthread_create consumer");
1981 /* We are about to wait on a pthread condition */
1982 pthread_mutex_lock(&consumer_data
->cond_mutex
);
1984 /* Get time for sem_timedwait absolute timeout */
1985 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
1987 * Set the timeout for the condition timed wait even if the clock gettime
1988 * call fails since we might loop on that call and we want to avoid to
1989 * increment the timeout too many times.
1991 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1994 * The following loop COULD be skipped in some conditions so this is why we
1995 * set ret to 0 in order to make sure at least one round of the loop is
2001 * Loop until the condition is reached or when a timeout is reached. Note
2002 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2003 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2004 * possible. This loop does not take any chances and works with both of
2007 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2008 if (clock_ret
< 0) {
2009 PERROR("clock_gettime spawn consumer");
2010 /* Infinite wait for the consumerd thread to be ready */
2011 ret
= pthread_cond_wait(&consumer_data
->cond
,
2012 &consumer_data
->cond_mutex
);
2014 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2015 &consumer_data
->cond_mutex
, &timeout
);
2019 /* Release the pthread condition */
2020 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2024 if (ret
== ETIMEDOUT
) {
2026 * Call has timed out so we kill the kconsumerd_thread and return
2029 ERR("Condition timed out. The consumer thread was never ready."
2031 ret
= pthread_cancel(consumer_data
->thread
);
2033 PERROR("pthread_cancel consumer thread");
2036 PERROR("pthread_cond_wait failed consumer thread");
2041 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2042 if (consumer_data
->pid
== 0) {
2043 ERR("Consumerd did not start");
2044 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2047 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2056 * Join consumer thread
2058 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2062 /* Consumer pid must be a real one. */
2063 if (consumer_data
->pid
> 0) {
2065 ret
= kill(consumer_data
->pid
, SIGTERM
);
2067 ERR("Error killing consumer daemon");
2070 return pthread_join(consumer_data
->thread
, &status
);
2077 * Fork and exec a consumer daemon (consumerd).
2079 * Return pid if successful else -1.
2081 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2085 const char *consumer_to_use
;
2086 const char *verbosity
;
2089 DBG("Spawning consumerd");
2096 if (opt_verbose_consumer
) {
2097 verbosity
= "--verbose";
2099 verbosity
= "--quiet";
2101 switch (consumer_data
->type
) {
2102 case LTTNG_CONSUMER_KERNEL
:
2104 * Find out which consumerd to execute. We will first try the
2105 * 64-bit path, then the sessiond's installation directory, and
2106 * fallback on the 32-bit one,
2108 DBG3("Looking for a kernel consumer at these locations:");
2109 DBG3(" 1) %s", consumerd64_bin
);
2110 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2111 DBG3(" 3) %s", consumerd32_bin
);
2112 if (stat(consumerd64_bin
, &st
) == 0) {
2113 DBG3("Found location #1");
2114 consumer_to_use
= consumerd64_bin
;
2115 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2116 DBG3("Found location #2");
2117 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2118 } else if (stat(consumerd32_bin
, &st
) == 0) {
2119 DBG3("Found location #3");
2120 consumer_to_use
= consumerd32_bin
;
2122 DBG("Could not find any valid consumerd executable");
2125 DBG("Using kernel consumer at: %s", consumer_to_use
);
2126 execl(consumer_to_use
,
2127 "lttng-consumerd", verbosity
, "-k",
2128 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2129 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2132 case LTTNG_CONSUMER64_UST
:
2134 char *tmpnew
= NULL
;
2136 if (consumerd64_libdir
[0] != '\0') {
2140 tmp
= getenv("LD_LIBRARY_PATH");
2144 tmplen
= strlen("LD_LIBRARY_PATH=")
2145 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2146 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2151 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2152 strcat(tmpnew
, consumerd64_libdir
);
2153 if (tmp
[0] != '\0') {
2154 strcat(tmpnew
, ":");
2155 strcat(tmpnew
, tmp
);
2157 ret
= putenv(tmpnew
);
2164 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2165 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2166 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2167 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2169 if (consumerd64_libdir
[0] != '\0') {
2177 case LTTNG_CONSUMER32_UST
:
2179 char *tmpnew
= NULL
;
2181 if (consumerd32_libdir
[0] != '\0') {
2185 tmp
= getenv("LD_LIBRARY_PATH");
2189 tmplen
= strlen("LD_LIBRARY_PATH=")
2190 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2191 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2196 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2197 strcat(tmpnew
, consumerd32_libdir
);
2198 if (tmp
[0] != '\0') {
2199 strcat(tmpnew
, ":");
2200 strcat(tmpnew
, tmp
);
2202 ret
= putenv(tmpnew
);
2209 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2210 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2211 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2212 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2214 if (consumerd32_libdir
[0] != '\0') {
2223 PERROR("unknown consumer type");
2227 PERROR("kernel start consumer exec");
2230 } else if (pid
> 0) {
2233 PERROR("start consumer fork");
2241 * Spawn the consumerd daemon and session daemon thread.
2243 static int start_consumerd(struct consumer_data
*consumer_data
)
2248 * Set the listen() state on the socket since there is a possible race
2249 * between the exec() of the consumer daemon and this call if place in the
2250 * consumer thread. See bug #366 for more details.
2252 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2257 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2258 if (consumer_data
->pid
!= 0) {
2259 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2263 ret
= spawn_consumerd(consumer_data
);
2265 ERR("Spawning consumerd failed");
2266 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2270 /* Setting up the consumer_data pid */
2271 consumer_data
->pid
= ret
;
2272 DBG2("Consumer pid %d", consumer_data
->pid
);
2273 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2275 DBG2("Spawning consumer control thread");
2276 ret
= spawn_consumer_thread(consumer_data
);
2278 ERR("Fatal error spawning consumer control thread");
2286 /* Cleanup already created sockets on error. */
2287 if (consumer_data
->err_sock
>= 0) {
2290 err
= close(consumer_data
->err_sock
);
2292 PERROR("close consumer data error socket");
2299 * Compute health status of each consumer. If one of them is zero (bad
2300 * state), we return 0.
2302 static int check_consumer_health(void)
2306 ret
= health_check_state(health_sessiond
, HEALTH_TYPE_CONSUMER
);
2308 DBG3("Health consumer check %d", ret
);
2314 * Setup necessary data for kernel tracer action.
2316 static int init_kernel_tracer(void)
2320 /* Modprobe lttng kernel modules */
2321 ret
= modprobe_lttng_control();
2326 /* Open debugfs lttng */
2327 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2328 if (kernel_tracer_fd
< 0) {
2329 DBG("Failed to open %s", module_proc_lttng
);
2334 /* Validate kernel version */
2335 ret
= kernel_validate_version(kernel_tracer_fd
);
2340 ret
= modprobe_lttng_data();
2345 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2349 modprobe_remove_lttng_control();
2350 ret
= close(kernel_tracer_fd
);
2354 kernel_tracer_fd
= -1;
2355 return LTTNG_ERR_KERN_VERSION
;
2358 ret
= close(kernel_tracer_fd
);
2364 modprobe_remove_lttng_control();
2367 WARN("No kernel tracer available");
2368 kernel_tracer_fd
= -1;
2370 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2372 return LTTNG_ERR_KERN_NA
;
2378 * Copy consumer output from the tracing session to the domain session. The
2379 * function also applies the right modification on a per domain basis for the
2380 * trace files destination directory.
2382 * Should *NOT* be called with RCU read-side lock held.
2384 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2387 const char *dir_name
;
2388 struct consumer_output
*consumer
;
2391 assert(session
->consumer
);
2394 case LTTNG_DOMAIN_KERNEL
:
2395 DBG3("Copying tracing session consumer output in kernel session");
2397 * XXX: We should audit the session creation and what this function
2398 * does "extra" in order to avoid a destroy since this function is used
2399 * in the domain session creation (kernel and ust) only. Same for UST
2402 if (session
->kernel_session
->consumer
) {
2403 consumer_destroy_output(session
->kernel_session
->consumer
);
2405 session
->kernel_session
->consumer
=
2406 consumer_copy_output(session
->consumer
);
2407 /* Ease our life a bit for the next part */
2408 consumer
= session
->kernel_session
->consumer
;
2409 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2411 case LTTNG_DOMAIN_UST
:
2412 DBG3("Copying tracing session consumer output in UST session");
2413 if (session
->ust_session
->consumer
) {
2414 consumer_destroy_output(session
->ust_session
->consumer
);
2416 session
->ust_session
->consumer
=
2417 consumer_copy_output(session
->consumer
);
2418 /* Ease our life a bit for the next part */
2419 consumer
= session
->ust_session
->consumer
;
2420 dir_name
= DEFAULT_UST_TRACE_DIR
;
2423 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2427 /* Append correct directory to subdir */
2428 strncat(consumer
->subdir
, dir_name
,
2429 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2430 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2439 * Create an UST session and add it to the session ust list.
2441 * Should *NOT* be called with RCU read-side lock held.
2443 static int create_ust_session(struct ltt_session
*session
,
2444 struct lttng_domain
*domain
)
2447 struct ltt_ust_session
*lus
= NULL
;
2451 assert(session
->consumer
);
2453 switch (domain
->type
) {
2454 case LTTNG_DOMAIN_UST
:
2457 ERR("Unknown UST domain on create session %d", domain
->type
);
2458 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2462 DBG("Creating UST session");
2464 lus
= trace_ust_create_session(session
->id
);
2466 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2470 lus
->uid
= session
->uid
;
2471 lus
->gid
= session
->gid
;
2472 lus
->output_traces
= session
->output_traces
;
2473 lus
->snapshot_mode
= session
->snapshot_mode
;
2474 lus
->live_timer_interval
= session
->live_timer
;
2475 session
->ust_session
= lus
;
2477 /* Copy session output to the newly created UST session */
2478 ret
= copy_session_consumer(domain
->type
, session
);
2479 if (ret
!= LTTNG_OK
) {
2487 session
->ust_session
= NULL
;
2492 * Create a kernel tracer session then create the default channel.
2494 static int create_kernel_session(struct ltt_session
*session
)
2498 DBG("Creating kernel session");
2500 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2502 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2506 /* Code flow safety */
2507 assert(session
->kernel_session
);
2509 /* Copy session output to the newly created Kernel session */
2510 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2511 if (ret
!= LTTNG_OK
) {
2515 /* Create directory(ies) on local filesystem. */
2516 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2517 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2518 ret
= run_as_mkdir_recursive(
2519 session
->kernel_session
->consumer
->dst
.trace_path
,
2520 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2522 if (ret
!= -EEXIST
) {
2523 ERR("Trace directory creation error");
2529 session
->kernel_session
->uid
= session
->uid
;
2530 session
->kernel_session
->gid
= session
->gid
;
2531 session
->kernel_session
->output_traces
= session
->output_traces
;
2532 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2537 trace_kernel_destroy_session(session
->kernel_session
);
2538 session
->kernel_session
= NULL
;
2543 * Count number of session permitted by uid/gid.
2545 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2548 struct ltt_session
*session
;
2550 DBG("Counting number of available session for UID %d GID %d",
2552 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2554 * Only list the sessions the user can control.
2556 if (!session_access_ok(session
, uid
, gid
)) {
2565 * Process the command requested by the lttng client within the command
2566 * context structure. This function make sure that the return structure (llm)
2567 * is set and ready for transmission before returning.
2569 * Return any error encountered or 0 for success.
2571 * "sock" is only used for special-case var. len data.
2573 * Should *NOT* be called with RCU read-side lock held.
2575 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2579 int need_tracing_session
= 1;
2582 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2586 switch (cmd_ctx
->lsm
->cmd_type
) {
2587 case LTTNG_CREATE_SESSION
:
2588 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2589 case LTTNG_CREATE_SESSION_LIVE
:
2590 case LTTNG_DESTROY_SESSION
:
2591 case LTTNG_LIST_SESSIONS
:
2592 case LTTNG_LIST_DOMAINS
:
2593 case LTTNG_START_TRACE
:
2594 case LTTNG_STOP_TRACE
:
2595 case LTTNG_DATA_PENDING
:
2596 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2597 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2598 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2599 case LTTNG_SNAPSHOT_RECORD
:
2606 if (opt_no_kernel
&& need_domain
2607 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2609 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2611 ret
= LTTNG_ERR_KERN_NA
;
2616 /* Deny register consumer if we already have a spawned consumer. */
2617 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2618 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2619 if (kconsumer_data
.pid
> 0) {
2620 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2621 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2624 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2628 * Check for command that don't needs to allocate a returned payload. We do
2629 * this here so we don't have to make the call for no payload at each
2632 switch(cmd_ctx
->lsm
->cmd_type
) {
2633 case LTTNG_LIST_SESSIONS
:
2634 case LTTNG_LIST_TRACEPOINTS
:
2635 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2636 case LTTNG_LIST_DOMAINS
:
2637 case LTTNG_LIST_CHANNELS
:
2638 case LTTNG_LIST_EVENTS
:
2641 /* Setup lttng message with no payload */
2642 ret
= setup_lttng_msg(cmd_ctx
, 0);
2644 /* This label does not try to unlock the session */
2645 goto init_setup_error
;
2649 /* Commands that DO NOT need a session. */
2650 switch (cmd_ctx
->lsm
->cmd_type
) {
2651 case LTTNG_CREATE_SESSION
:
2652 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2653 case LTTNG_CREATE_SESSION_LIVE
:
2654 case LTTNG_CALIBRATE
:
2655 case LTTNG_LIST_SESSIONS
:
2656 case LTTNG_LIST_TRACEPOINTS
:
2657 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2658 need_tracing_session
= 0;
2661 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2663 * We keep the session list lock across _all_ commands
2664 * for now, because the per-session lock does not
2665 * handle teardown properly.
2667 session_lock_list();
2668 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2669 if (cmd_ctx
->session
== NULL
) {
2670 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2673 /* Acquire lock for the session */
2674 session_lock(cmd_ctx
->session
);
2684 * Check domain type for specific "pre-action".
2686 switch (cmd_ctx
->lsm
->domain
.type
) {
2687 case LTTNG_DOMAIN_KERNEL
:
2689 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2693 /* Kernel tracer check */
2694 if (kernel_tracer_fd
== -1) {
2695 /* Basically, load kernel tracer modules */
2696 ret
= init_kernel_tracer();
2702 /* Consumer is in an ERROR state. Report back to client */
2703 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2704 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2708 /* Need a session for kernel command */
2709 if (need_tracing_session
) {
2710 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2711 ret
= create_kernel_session(cmd_ctx
->session
);
2713 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2718 /* Start the kernel consumer daemon */
2719 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2720 if (kconsumer_data
.pid
== 0 &&
2721 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2722 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2723 ret
= start_consumerd(&kconsumer_data
);
2725 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2728 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2730 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2734 * The consumer was just spawned so we need to add the socket to
2735 * the consumer output of the session if exist.
2737 ret
= consumer_create_socket(&kconsumer_data
,
2738 cmd_ctx
->session
->kernel_session
->consumer
);
2745 case LTTNG_DOMAIN_UST
:
2747 if (!ust_app_supported()) {
2748 ret
= LTTNG_ERR_NO_UST
;
2751 /* Consumer is in an ERROR state. Report back to client */
2752 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2753 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2757 if (need_tracing_session
) {
2758 /* Create UST session if none exist. */
2759 if (cmd_ctx
->session
->ust_session
== NULL
) {
2760 ret
= create_ust_session(cmd_ctx
->session
,
2761 &cmd_ctx
->lsm
->domain
);
2762 if (ret
!= LTTNG_OK
) {
2767 /* Start the UST consumer daemons */
2769 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2770 if (consumerd64_bin
[0] != '\0' &&
2771 ustconsumer64_data
.pid
== 0 &&
2772 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2773 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2774 ret
= start_consumerd(&ustconsumer64_data
);
2776 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2777 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2781 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2782 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2784 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2788 * Setup socket for consumer 64 bit. No need for atomic access
2789 * since it was set above and can ONLY be set in this thread.
2791 ret
= consumer_create_socket(&ustconsumer64_data
,
2792 cmd_ctx
->session
->ust_session
->consumer
);
2798 if (consumerd32_bin
[0] != '\0' &&
2799 ustconsumer32_data
.pid
== 0 &&
2800 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2801 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2802 ret
= start_consumerd(&ustconsumer32_data
);
2804 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2805 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2809 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2810 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2812 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2816 * Setup socket for consumer 64 bit. No need for atomic access
2817 * since it was set above and can ONLY be set in this thread.
2819 ret
= consumer_create_socket(&ustconsumer32_data
,
2820 cmd_ctx
->session
->ust_session
->consumer
);
2832 /* Validate consumer daemon state when start/stop trace command */
2833 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2834 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2835 switch (cmd_ctx
->lsm
->domain
.type
) {
2836 case LTTNG_DOMAIN_UST
:
2837 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2838 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2842 case LTTNG_DOMAIN_KERNEL
:
2843 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2844 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2852 * Check that the UID or GID match that of the tracing session.
2853 * The root user can interact with all sessions.
2855 if (need_tracing_session
) {
2856 if (!session_access_ok(cmd_ctx
->session
,
2857 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2858 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2859 ret
= LTTNG_ERR_EPERM
;
2865 * Send relayd information to consumer as soon as we have a domain and a
2868 if (cmd_ctx
->session
&& need_domain
) {
2870 * Setup relayd if not done yet. If the relayd information was already
2871 * sent to the consumer, this call will gracefully return.
2873 ret
= cmd_setup_relayd(cmd_ctx
->session
);
2874 if (ret
!= LTTNG_OK
) {
2879 /* Process by command type */
2880 switch (cmd_ctx
->lsm
->cmd_type
) {
2881 case LTTNG_ADD_CONTEXT
:
2883 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2884 cmd_ctx
->lsm
->u
.context
.channel_name
,
2885 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2888 case LTTNG_DISABLE_CHANNEL
:
2890 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2891 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2894 case LTTNG_DISABLE_EVENT
:
2896 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2897 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2898 cmd_ctx
->lsm
->u
.disable
.name
);
2901 case LTTNG_DISABLE_ALL_EVENT
:
2903 DBG("Disabling all events");
2905 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2906 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2909 case LTTNG_ENABLE_CHANNEL
:
2911 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2912 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2915 case LTTNG_ENABLE_EVENT
:
2917 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2918 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2919 &cmd_ctx
->lsm
->u
.enable
.event
, NULL
, kernel_poll_pipe
[1]);
2922 case LTTNG_ENABLE_ALL_EVENT
:
2924 DBG("Enabling all events");
2926 ret
= cmd_enable_event_all(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2927 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2928 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
2931 case LTTNG_LIST_TRACEPOINTS
:
2933 struct lttng_event
*events
;
2936 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2937 if (nb_events
< 0) {
2938 /* Return value is a negative lttng_error_code. */
2944 * Setup lttng message with payload size set to the event list size in
2945 * bytes and then copy list into the llm payload.
2947 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2953 /* Copy event list into message payload */
2954 memcpy(cmd_ctx
->llm
->payload
, events
,
2955 sizeof(struct lttng_event
) * nb_events
);
2962 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2964 struct lttng_event_field
*fields
;
2967 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2969 if (nb_fields
< 0) {
2970 /* Return value is a negative lttng_error_code. */
2976 * Setup lttng message with payload size set to the event list size in
2977 * bytes and then copy list into the llm payload.
2979 ret
= setup_lttng_msg(cmd_ctx
,
2980 sizeof(struct lttng_event_field
) * nb_fields
);
2986 /* Copy event list into message payload */
2987 memcpy(cmd_ctx
->llm
->payload
, fields
,
2988 sizeof(struct lttng_event_field
) * nb_fields
);
2995 case LTTNG_SET_CONSUMER_URI
:
2998 struct lttng_uri
*uris
;
3000 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3001 len
= nb_uri
* sizeof(struct lttng_uri
);
3004 ret
= LTTNG_ERR_INVALID
;
3008 uris
= zmalloc(len
);
3010 ret
= LTTNG_ERR_FATAL
;
3014 /* Receive variable len data */
3015 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3016 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3018 DBG("No URIs received from client... continuing");
3020 ret
= LTTNG_ERR_SESSION_FAIL
;
3025 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3027 if (ret
!= LTTNG_OK
) {
3033 * XXX: 0 means that this URI should be applied on the session. Should
3034 * be a DOMAIN enuam.
3036 if (cmd_ctx
->lsm
->domain
.type
== 0) {
3037 /* Add the URI for the UST session if a consumer is present. */
3038 if (cmd_ctx
->session
->ust_session
&&
3039 cmd_ctx
->session
->ust_session
->consumer
) {
3040 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
3042 } else if (cmd_ctx
->session
->kernel_session
&&
3043 cmd_ctx
->session
->kernel_session
->consumer
) {
3044 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
3045 cmd_ctx
->session
, nb_uri
, uris
);
3053 case LTTNG_START_TRACE
:
3055 ret
= cmd_start_trace(cmd_ctx
->session
);
3058 case LTTNG_STOP_TRACE
:
3060 ret
= cmd_stop_trace(cmd_ctx
->session
);
3063 case LTTNG_CREATE_SESSION
:
3066 struct lttng_uri
*uris
= NULL
;
3068 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3069 len
= nb_uri
* sizeof(struct lttng_uri
);
3072 uris
= zmalloc(len
);
3074 ret
= LTTNG_ERR_FATAL
;
3078 /* Receive variable len data */
3079 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3080 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3082 DBG("No URIs received from client... continuing");
3084 ret
= LTTNG_ERR_SESSION_FAIL
;
3089 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3090 DBG("Creating session with ONE network URI is a bad call");
3091 ret
= LTTNG_ERR_SESSION_FAIL
;
3097 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3098 &cmd_ctx
->creds
, 0);
3104 case LTTNG_DESTROY_SESSION
:
3106 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3108 /* Set session to NULL so we do not unlock it after free. */
3109 cmd_ctx
->session
= NULL
;
3112 case LTTNG_LIST_DOMAINS
:
3115 struct lttng_domain
*domains
;
3117 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3119 /* Return value is a negative lttng_error_code. */
3124 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3130 /* Copy event list into message payload */
3131 memcpy(cmd_ctx
->llm
->payload
, domains
,
3132 nb_dom
* sizeof(struct lttng_domain
));
3139 case LTTNG_LIST_CHANNELS
:
3142 struct lttng_channel
*channels
;
3144 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3145 cmd_ctx
->session
, &channels
);
3147 /* Return value is a negative lttng_error_code. */
3152 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3158 /* Copy event list into message payload */
3159 memcpy(cmd_ctx
->llm
->payload
, channels
,
3160 nb_chan
* sizeof(struct lttng_channel
));
3167 case LTTNG_LIST_EVENTS
:
3170 struct lttng_event
*events
= NULL
;
3172 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3173 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3175 /* Return value is a negative lttng_error_code. */
3180 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3186 /* Copy event list into message payload */
3187 memcpy(cmd_ctx
->llm
->payload
, events
,
3188 nb_event
* sizeof(struct lttng_event
));
3195 case LTTNG_LIST_SESSIONS
:
3197 unsigned int nr_sessions
;
3199 session_lock_list();
3200 nr_sessions
= lttng_sessions_count(
3201 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3202 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3204 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3206 session_unlock_list();
3210 /* Filled the session array */
3211 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3212 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3213 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3215 session_unlock_list();
3220 case LTTNG_CALIBRATE
:
3222 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3223 &cmd_ctx
->lsm
->u
.calibrate
);
3226 case LTTNG_REGISTER_CONSUMER
:
3228 struct consumer_data
*cdata
;
3230 switch (cmd_ctx
->lsm
->domain
.type
) {
3231 case LTTNG_DOMAIN_KERNEL
:
3232 cdata
= &kconsumer_data
;
3235 ret
= LTTNG_ERR_UND
;
3239 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3240 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3243 case LTTNG_ENABLE_EVENT_WITH_FILTER
:
3245 struct lttng_filter_bytecode
*bytecode
;
3247 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3248 ret
= LTTNG_ERR_FILTER_INVAL
;
3251 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
== 0) {
3252 ret
= LTTNG_ERR_FILTER_INVAL
;
3255 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3257 ret
= LTTNG_ERR_FILTER_NOMEM
;
3260 /* Receive var. len. data */
3261 DBG("Receiving var len data from client ...");
3262 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
3263 cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3265 DBG("Nothing recv() from client var len data... continuing");
3267 ret
= LTTNG_ERR_FILTER_INVAL
;
3271 if (bytecode
->len
+ sizeof(*bytecode
)
3272 != cmd_ctx
->lsm
->u
.enable
.bytecode_len
) {
3274 ret
= LTTNG_ERR_FILTER_INVAL
;
3278 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3279 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3280 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, kernel_poll_pipe
[1]);
3283 case LTTNG_DATA_PENDING
:
3285 ret
= cmd_data_pending(cmd_ctx
->session
);
3288 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3290 struct lttcomm_lttng_output_id reply
;
3292 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3293 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3294 if (ret
!= LTTNG_OK
) {
3298 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3303 /* Copy output list into message payload */
3304 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3308 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3310 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3311 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3314 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3317 struct lttng_snapshot_output
*outputs
= NULL
;
3319 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3320 if (nb_output
< 0) {
3325 ret
= setup_lttng_msg(cmd_ctx
,
3326 nb_output
* sizeof(struct lttng_snapshot_output
));
3333 /* Copy output list into message payload */
3334 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3335 nb_output
* sizeof(struct lttng_snapshot_output
));
3342 case LTTNG_SNAPSHOT_RECORD
:
3344 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3345 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3346 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3349 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3352 struct lttng_uri
*uris
= NULL
;
3354 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3355 len
= nb_uri
* sizeof(struct lttng_uri
);
3358 uris
= zmalloc(len
);
3360 ret
= LTTNG_ERR_FATAL
;
3364 /* Receive variable len data */
3365 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3366 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3368 DBG("No URIs received from client... continuing");
3370 ret
= LTTNG_ERR_SESSION_FAIL
;
3375 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3376 DBG("Creating session with ONE network URI is a bad call");
3377 ret
= LTTNG_ERR_SESSION_FAIL
;
3383 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
3384 nb_uri
, &cmd_ctx
->creds
);
3388 case LTTNG_CREATE_SESSION_LIVE
:
3391 struct lttng_uri
*uris
= NULL
;
3393 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3394 len
= nb_uri
* sizeof(struct lttng_uri
);
3397 uris
= zmalloc(len
);
3399 ret
= LTTNG_ERR_FATAL
;
3403 /* Receive variable len data */
3404 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3405 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3407 DBG("No URIs received from client... continuing");
3409 ret
= LTTNG_ERR_SESSION_FAIL
;
3414 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3415 DBG("Creating session with ONE network URI is a bad call");
3416 ret
= LTTNG_ERR_SESSION_FAIL
;
3422 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
3423 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
3428 ret
= LTTNG_ERR_UND
;
3433 if (cmd_ctx
->llm
== NULL
) {
3434 DBG("Missing llm structure. Allocating one.");
3435 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3439 /* Set return code */
3440 cmd_ctx
->llm
->ret_code
= ret
;
3442 if (cmd_ctx
->session
) {
3443 session_unlock(cmd_ctx
->session
);
3445 if (need_tracing_session
) {
3446 session_unlock_list();
3453 * Thread managing health check socket.
3455 static void *thread_manage_health(void *data
)
3457 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3458 uint32_t revents
, nb_fd
;
3459 struct lttng_poll_event events
;
3460 struct lttcomm_health_msg msg
;
3461 struct lttcomm_health_data reply
;
3463 DBG("[thread] Manage health check started");
3465 rcu_register_thread();
3467 /* We might hit an error path before this is created. */
3468 lttng_poll_init(&events
);
3470 /* Create unix socket */
3471 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3473 ERR("Unable to create health check Unix socket");
3479 * Set the CLOEXEC flag. Return code is useless because either way, the
3482 (void) utils_set_fd_cloexec(sock
);
3484 ret
= lttcomm_listen_unix_sock(sock
);
3490 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3491 * more will be added to this poll set.
3493 ret
= sessiond_set_thread_pollset(&events
, 2);
3498 /* Add the application registration socket */
3499 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3505 DBG("Health check ready");
3507 /* Inifinite blocking call, waiting for transmission */
3509 ret
= lttng_poll_wait(&events
, -1);
3512 * Restart interrupted system call.
3514 if (errno
== EINTR
) {
3522 for (i
= 0; i
< nb_fd
; i
++) {
3523 /* Fetch once the poll data */
3524 revents
= LTTNG_POLL_GETEV(&events
, i
);
3525 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3527 /* Thread quit pipe has been closed. Killing thread. */
3528 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3534 /* Event on the registration socket */
3535 if (pollfd
== sock
) {
3536 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3537 ERR("Health socket poll error");
3543 new_sock
= lttcomm_accept_unix_sock(sock
);
3549 * Set the CLOEXEC flag. Return code is useless because either way, the
3552 (void) utils_set_fd_cloexec(new_sock
);
3554 DBG("Receiving data from client for health...");
3555 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3557 DBG("Nothing recv() from client... continuing");
3558 ret
= close(new_sock
);
3566 rcu_thread_online();
3568 switch (msg
.component
) {
3569 case LTTNG_HEALTH_CMD
:
3570 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_CMD
);
3572 case LTTNG_HEALTH_APP_MANAGE
:
3573 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_APP_MANAGE
);
3575 case LTTNG_HEALTH_APP_REG
:
3576 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_APP_REG
);
3578 case LTTNG_HEALTH_KERNEL
:
3579 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_KERNEL
);
3581 case LTTNG_HEALTH_CONSUMER
:
3582 reply
.ret_code
= check_consumer_health();
3584 case LTTNG_HEALTH_HT_CLEANUP
:
3585 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_HT_CLEANUP
);
3587 case LTTNG_HEALTH_APP_MANAGE_NOTIFY
:
3588 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_APP_MANAGE_NOTIFY
);
3590 case LTTNG_HEALTH_APP_REG_DISPATCH
:
3591 reply
.ret_code
= health_check_state(health_sessiond
, HEALTH_TYPE_APP_REG_DISPATCH
);
3593 case LTTNG_HEALTH_ALL
:
3595 health_check_state(health_sessiond
, HEALTH_TYPE_APP_MANAGE
) &&
3596 health_check_state(health_sessiond
, HEALTH_TYPE_APP_REG
) &&
3597 health_check_state(health_sessiond
, HEALTH_TYPE_CMD
) &&
3598 health_check_state(health_sessiond
, HEALTH_TYPE_KERNEL
) &&
3599 check_consumer_health() &&
3600 health_check_state(health_sessiond
, HEALTH_TYPE_HT_CLEANUP
) &&
3601 health_check_state(health_sessiond
, HEALTH_TYPE_APP_MANAGE_NOTIFY
) &&
3602 health_check_state(health_sessiond
, HEALTH_TYPE_APP_REG_DISPATCH
);
3605 reply
.ret_code
= LTTNG_ERR_UND
;
3610 * Flip ret value since 0 is a success and 1 indicates a bad health for
3611 * the client where in the sessiond it is the opposite. Again, this is
3612 * just to make things easier for us poor developer which enjoy a lot
3615 if (reply
.ret_code
== 0 || reply
.ret_code
== 1) {
3616 reply
.ret_code
= !reply
.ret_code
;
3619 DBG2("Health check return value %d", reply
.ret_code
);
3621 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3623 ERR("Failed to send health data back to client");
3626 /* End of transmission */
3627 ret
= close(new_sock
);
3637 ERR("Health error occurred in %s", __func__
);
3639 DBG("Health check thread dying");
3640 unlink(health_unix_sock_path
);
3648 lttng_poll_clean(&events
);
3650 rcu_unregister_thread();
3655 * This thread manage all clients request using the unix client socket for
3658 static void *thread_manage_clients(void *data
)
3660 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3662 uint32_t revents
, nb_fd
;
3663 struct command_ctx
*cmd_ctx
= NULL
;
3664 struct lttng_poll_event events
;
3666 DBG("[thread] Manage client started");
3668 rcu_register_thread();
3670 health_register(health_sessiond
, HEALTH_TYPE_CMD
);
3672 if (testpoint(thread_manage_clients
)) {
3673 goto error_testpoint
;
3676 health_code_update();
3678 ret
= lttcomm_listen_unix_sock(client_sock
);
3684 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3685 * more will be added to this poll set.
3687 ret
= sessiond_set_thread_pollset(&events
, 2);
3689 goto error_create_poll
;
3692 /* Add the application registration socket */
3693 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3699 * Notify parent pid that we are ready to accept command for client side.
3701 if (opt_sig_parent
) {
3702 kill(ppid
, SIGUSR1
);
3705 if (testpoint(thread_manage_clients_before_loop
)) {
3709 health_code_update();
3712 DBG("Accepting client command ...");
3714 /* Inifinite blocking call, waiting for transmission */
3716 health_poll_entry();
3717 ret
= lttng_poll_wait(&events
, -1);
3721 * Restart interrupted system call.
3723 if (errno
== EINTR
) {
3731 for (i
= 0; i
< nb_fd
; i
++) {
3732 /* Fetch once the poll data */
3733 revents
= LTTNG_POLL_GETEV(&events
, i
);
3734 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3736 health_code_update();
3738 /* Thread quit pipe has been closed. Killing thread. */
3739 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3745 /* Event on the registration socket */
3746 if (pollfd
== client_sock
) {
3747 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3748 ERR("Client socket poll error");
3754 DBG("Wait for client response");
3756 health_code_update();
3758 sock
= lttcomm_accept_unix_sock(client_sock
);
3764 * Set the CLOEXEC flag. Return code is useless because either way, the
3767 (void) utils_set_fd_cloexec(sock
);
3769 /* Set socket option for credentials retrieval */
3770 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3775 /* Allocate context command to process the client request */
3776 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3777 if (cmd_ctx
== NULL
) {
3778 PERROR("zmalloc cmd_ctx");
3782 /* Allocate data buffer for reception */
3783 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3784 if (cmd_ctx
->lsm
== NULL
) {
3785 PERROR("zmalloc cmd_ctx->lsm");
3789 cmd_ctx
->llm
= NULL
;
3790 cmd_ctx
->session
= NULL
;
3792 health_code_update();
3795 * Data is received from the lttng client. The struct
3796 * lttcomm_session_msg (lsm) contains the command and data request of
3799 DBG("Receiving data from client ...");
3800 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3801 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3803 DBG("Nothing recv() from client... continuing");
3809 clean_command_ctx(&cmd_ctx
);
3813 health_code_update();
3815 // TODO: Validate cmd_ctx including sanity check for
3816 // security purpose.
3818 rcu_thread_online();
3820 * This function dispatch the work to the kernel or userspace tracer
3821 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3822 * informations for the client. The command context struct contains
3823 * everything this function may needs.
3825 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3826 rcu_thread_offline();
3834 * TODO: Inform client somehow of the fatal error. At
3835 * this point, ret < 0 means that a zmalloc failed
3836 * (ENOMEM). Error detected but still accept
3837 * command, unless a socket error has been
3840 clean_command_ctx(&cmd_ctx
);
3844 health_code_update();
3846 DBG("Sending response (size: %d, retcode: %s)",
3847 cmd_ctx
->lttng_msg_size
,
3848 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3849 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3851 ERR("Failed to send data back to client");
3854 /* End of transmission */
3861 clean_command_ctx(&cmd_ctx
);
3863 health_code_update();
3875 lttng_poll_clean(&events
);
3876 clean_command_ctx(&cmd_ctx
);
3881 unlink(client_unix_sock_path
);
3882 if (client_sock
>= 0) {
3883 ret
= close(client_sock
);
3891 ERR("Health error occurred in %s", __func__
);
3894 health_unregister(health_sessiond
);
3896 DBG("Client thread dying");
3898 rcu_unregister_thread();
3904 * usage function on stderr
3906 static void usage(void)
3908 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3909 fprintf(stderr
, " -h, --help Display this usage.\n");
3910 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3911 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3912 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3913 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3914 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3915 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3916 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3917 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3918 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3919 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3920 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3921 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3922 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3923 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3924 fprintf(stderr
, " -V, --version Show version number.\n");
3925 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3926 fprintf(stderr
, " -q, --quiet No output at all.\n");
3927 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3928 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3929 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3930 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3934 * daemon argument parsing
3936 static int parse_args(int argc
, char **argv
)
3940 static struct option long_options
[] = {
3941 { "client-sock", 1, 0, 'c' },
3942 { "apps-sock", 1, 0, 'a' },
3943 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3944 { "kconsumerd-err-sock", 1, 0, 'E' },
3945 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3946 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3947 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3948 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3949 { "consumerd32-path", 1, 0, 'u' },
3950 { "consumerd32-libdir", 1, 0, 'U' },
3951 { "consumerd64-path", 1, 0, 't' },
3952 { "consumerd64-libdir", 1, 0, 'T' },
3953 { "daemonize", 0, 0, 'd' },
3954 { "sig-parent", 0, 0, 'S' },
3955 { "help", 0, 0, 'h' },
3956 { "group", 1, 0, 'g' },
3957 { "version", 0, 0, 'V' },
3958 { "quiet", 0, 0, 'q' },
3959 { "verbose", 0, 0, 'v' },
3960 { "verbose-consumer", 0, 0, 'Z' },
3961 { "no-kernel", 0, 0, 'N' },
3962 { "pidfile", 1, 0, 'p' },
3967 int option_index
= 0;
3968 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3969 long_options
, &option_index
);
3976 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3978 fprintf(stderr
, " with arg %s\n", optarg
);
3982 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3985 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3991 opt_tracing_group
= optarg
;
3997 fprintf(stdout
, "%s\n", VERSION
);
4003 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4006 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4009 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4012 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4015 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4018 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4024 lttng_opt_quiet
= 1;
4027 /* Verbose level can increase using multiple -v */
4028 lttng_opt_verbose
+= 1;
4031 opt_verbose_consumer
+= 1;
4034 consumerd32_bin
= optarg
;
4037 consumerd32_libdir
= optarg
;
4040 consumerd64_bin
= optarg
;
4043 consumerd64_libdir
= optarg
;
4046 opt_pidfile
= optarg
;
4049 /* Unknown option or other error.
4050 * Error is printed by getopt, just return */
4059 * Creates the two needed socket by the daemon.
4060 * apps_sock - The communication socket for all UST apps.
4061 * client_sock - The communication of the cli tool (lttng).
4063 static int init_daemon_socket(void)
4068 old_umask
= umask(0);
4070 /* Create client tool unix socket */
4071 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4072 if (client_sock
< 0) {
4073 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4078 /* Set the cloexec flag */
4079 ret
= utils_set_fd_cloexec(client_sock
);
4081 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4082 "Continuing but note that the consumer daemon will have a "
4083 "reference to this socket on exec()", client_sock
);
4086 /* File permission MUST be 660 */
4087 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4089 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4094 /* Create the application unix socket */
4095 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4096 if (apps_sock
< 0) {
4097 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4102 /* Set the cloexec flag */
4103 ret
= utils_set_fd_cloexec(apps_sock
);
4105 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4106 "Continuing but note that the consumer daemon will have a "
4107 "reference to this socket on exec()", apps_sock
);
4110 /* File permission MUST be 666 */
4111 ret
= chmod(apps_unix_sock_path
,
4112 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4114 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4119 DBG3("Session daemon client socket %d and application socket %d created",
4120 client_sock
, apps_sock
);
4128 * Check if the global socket is available, and if a daemon is answering at the
4129 * other side. If yes, error is returned.
4131 static int check_existing_daemon(void)
4133 /* Is there anybody out there ? */
4134 if (lttng_session_daemon_alive()) {
4142 * Set the tracing group gid onto the client socket.
4144 * Race window between mkdir and chown is OK because we are going from more
4145 * permissive (root.root) to less permissive (root.tracing).
4147 static int set_permissions(char *rundir
)
4152 ret
= allowed_group();
4154 WARN("No tracing group detected");
4155 /* Setting gid to 0 if no tracing group is found */
4161 /* Set lttng run dir */
4162 ret
= chown(rundir
, 0, gid
);
4164 ERR("Unable to set group on %s", rundir
);
4168 /* Ensure all applications and tracing group can search the run dir */
4169 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4171 ERR("Unable to set permissions on %s", rundir
);
4175 /* lttng client socket path */
4176 ret
= chown(client_unix_sock_path
, 0, gid
);
4178 ERR("Unable to set group on %s", client_unix_sock_path
);
4182 /* kconsumer error socket path */
4183 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4185 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4189 /* 64-bit ustconsumer error socket path */
4190 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4192 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4196 /* 32-bit ustconsumer compat32 error socket path */
4197 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4199 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4203 DBG("All permissions are set");
4209 * Create the lttng run directory needed for all global sockets and pipe.
4211 static int create_lttng_rundir(const char *rundir
)
4215 DBG3("Creating LTTng run directory: %s", rundir
);
4217 ret
= mkdir(rundir
, S_IRWXU
);
4219 if (errno
!= EEXIST
) {
4220 ERR("Unable to create %s", rundir
);
4232 * Setup sockets and directory needed by the kconsumerd communication with the
4235 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4239 char path
[PATH_MAX
];
4241 switch (consumer_data
->type
) {
4242 case LTTNG_CONSUMER_KERNEL
:
4243 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4245 case LTTNG_CONSUMER64_UST
:
4246 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4248 case LTTNG_CONSUMER32_UST
:
4249 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4252 ERR("Consumer type unknown");
4257 DBG2("Creating consumer directory: %s", path
);
4259 ret
= mkdir(path
, S_IRWXU
);
4261 if (errno
!= EEXIST
) {
4263 ERR("Failed to create %s", path
);
4269 /* Create the kconsumerd error unix socket */
4270 consumer_data
->err_sock
=
4271 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4272 if (consumer_data
->err_sock
< 0) {
4273 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4279 * Set the CLOEXEC flag. Return code is useless because either way, the
4282 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
4284 PERROR("utils_set_fd_cloexec");
4285 /* continue anyway */
4288 /* File permission MUST be 660 */
4289 ret
= chmod(consumer_data
->err_unix_sock_path
,
4290 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4292 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4302 * Signal handler for the daemon
4304 * Simply stop all worker threads, leaving main() return gracefully after
4305 * joining all threads and calling cleanup().
4307 static void sighandler(int sig
)
4311 DBG("SIGPIPE caught");
4314 DBG("SIGINT caught");
4318 DBG("SIGTERM caught");
4327 * Setup signal handler for :
4328 * SIGINT, SIGTERM, SIGPIPE
4330 static int set_signal_handler(void)
4333 struct sigaction sa
;
4336 if ((ret
= sigemptyset(&sigset
)) < 0) {
4337 PERROR("sigemptyset");
4341 sa
.sa_handler
= sighandler
;
4342 sa
.sa_mask
= sigset
;
4344 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4345 PERROR("sigaction");
4349 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4350 PERROR("sigaction");
4354 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4355 PERROR("sigaction");
4359 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4365 * Set open files limit to unlimited. This daemon can open a large number of
4366 * file descriptors in order to consumer multiple kernel traces.
4368 static void set_ulimit(void)
4373 /* The kernel does not allowed an infinite limit for open files */
4374 lim
.rlim_cur
= 65535;
4375 lim
.rlim_max
= 65535;
4377 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4379 PERROR("failed to set open files limit");
4384 * Write pidfile using the rundir and opt_pidfile.
4386 static void write_pidfile(void)
4389 char pidfile_path
[PATH_MAX
];
4394 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
4396 /* Build pidfile path from rundir and opt_pidfile. */
4397 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
4398 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
4400 PERROR("snprintf pidfile path");
4406 * Create pid file in rundir. Return value is of no importance. The
4407 * execution will continue even though we are not able to write the file.
4409 (void) utils_create_pid_file(getpid(), pidfile_path
);
4418 int main(int argc
, char **argv
)
4422 const char *home_path
, *env_app_timeout
;
4424 init_kernel_workarounds();
4426 rcu_register_thread();
4428 setup_consumerd_path();
4430 page_size
= sysconf(_SC_PAGESIZE
);
4431 if (page_size
< 0) {
4432 PERROR("sysconf _SC_PAGESIZE");
4433 page_size
= LONG_MAX
;
4434 WARN("Fallback page size to %ld", page_size
);
4437 /* Parse arguments */
4439 if ((ret
= parse_args(argc
, argv
)) < 0) {
4449 * child: setsid, close FD 0, 1, 2, chdir /
4450 * parent: exit (if fork is successful)
4458 * We are in the child. Make sure all other file
4459 * descriptors are closed, in case we are called with
4460 * more opened file descriptors than the standard ones.
4462 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
4467 /* Create thread quit pipe */
4468 if ((ret
= init_thread_quit_pipe()) < 0) {
4472 /* Check if daemon is UID = 0 */
4473 is_root
= !getuid();
4476 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4478 /* Create global run dir with root access */
4479 ret
= create_lttng_rundir(rundir
);
4484 if (strlen(apps_unix_sock_path
) == 0) {
4485 snprintf(apps_unix_sock_path
, PATH_MAX
,
4486 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4489 if (strlen(client_unix_sock_path
) == 0) {
4490 snprintf(client_unix_sock_path
, PATH_MAX
,
4491 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4494 /* Set global SHM for ust */
4495 if (strlen(wait_shm_path
) == 0) {
4496 snprintf(wait_shm_path
, PATH_MAX
,
4497 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4500 if (strlen(health_unix_sock_path
) == 0) {
4501 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4502 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
4505 /* Setup kernel consumerd path */
4506 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4507 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4508 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4509 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4511 DBG2("Kernel consumer err path: %s",
4512 kconsumer_data
.err_unix_sock_path
);
4513 DBG2("Kernel consumer cmd path: %s",
4514 kconsumer_data
.cmd_unix_sock_path
);
4516 home_path
= utils_get_home_dir();
4517 if (home_path
== NULL
) {
4518 /* TODO: Add --socket PATH option */
4519 ERR("Can't get HOME directory for sockets creation.");
4525 * Create rundir from home path. This will create something like
4528 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4534 ret
= create_lttng_rundir(rundir
);
4539 if (strlen(apps_unix_sock_path
) == 0) {
4540 snprintf(apps_unix_sock_path
, PATH_MAX
,
4541 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4544 /* Set the cli tool unix socket path */
4545 if (strlen(client_unix_sock_path
) == 0) {
4546 snprintf(client_unix_sock_path
, PATH_MAX
,
4547 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4550 /* Set global SHM for ust */
4551 if (strlen(wait_shm_path
) == 0) {
4552 snprintf(wait_shm_path
, PATH_MAX
,
4553 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
4556 /* Set health check Unix path */
4557 if (strlen(health_unix_sock_path
) == 0) {
4558 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4559 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4563 /* Set consumer initial state */
4564 kernel_consumerd_state
= CONSUMER_STOPPED
;
4565 ust_consumerd_state
= CONSUMER_STOPPED
;
4567 DBG("Client socket path %s", client_unix_sock_path
);
4568 DBG("Application socket path %s", apps_unix_sock_path
);
4569 DBG("Application wait path %s", wait_shm_path
);
4570 DBG("LTTng run directory path: %s", rundir
);
4572 /* 32 bits consumerd path setup */
4573 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4574 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4575 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4576 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4578 DBG2("UST consumer 32 bits err path: %s",
4579 ustconsumer32_data
.err_unix_sock_path
);
4580 DBG2("UST consumer 32 bits cmd path: %s",
4581 ustconsumer32_data
.cmd_unix_sock_path
);
4583 /* 64 bits consumerd path setup */
4584 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4585 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4586 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4587 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4589 DBG2("UST consumer 64 bits err path: %s",
4590 ustconsumer64_data
.err_unix_sock_path
);
4591 DBG2("UST consumer 64 bits cmd path: %s",
4592 ustconsumer64_data
.cmd_unix_sock_path
);
4595 * See if daemon already exist.
4597 if ((ret
= check_existing_daemon()) < 0) {
4598 ERR("Already running daemon.\n");
4600 * We do not goto exit because we must not cleanup()
4601 * because a daemon is already running.
4607 * Init UST app hash table. Alloc hash table before this point since
4608 * cleanup() can get called after that point.
4612 /* After this point, we can safely call cleanup() with "goto exit" */
4615 * These actions must be executed as root. We do that *after* setting up
4616 * the sockets path because we MUST make the check for another daemon using
4617 * those paths *before* trying to set the kernel consumer sockets and init
4621 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4626 /* Setup kernel tracer */
4627 if (!opt_no_kernel
) {
4628 init_kernel_tracer();
4631 /* Set ulimit for open files */
4634 /* init lttng_fd tracking must be done after set_ulimit. */
4637 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4642 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4647 if ((ret
= set_signal_handler()) < 0) {
4651 /* Setup the needed unix socket */
4652 if ((ret
= init_daemon_socket()) < 0) {
4656 /* Set credentials to socket */
4657 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4661 /* Get parent pid if -S, --sig-parent is specified. */
4662 if (opt_sig_parent
) {
4666 /* Setup the kernel pipe for waking up the kernel thread */
4667 if (is_root
&& !opt_no_kernel
) {
4668 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4673 /* Setup the thread ht_cleanup communication pipe. */
4674 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
4678 /* Setup the thread apps communication pipe. */
4679 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4683 /* Setup the thread apps notify communication pipe. */
4684 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
4688 /* Initialize global buffer per UID and PID registry. */
4689 buffer_reg_init_uid_registry();
4690 buffer_reg_init_pid_registry();
4692 /* Init UST command queue. */
4693 cds_wfq_init(&ust_cmd_queue
.queue
);
4696 * Get session list pointer. This pointer MUST NOT be free(). This list is
4697 * statically declared in session.c
4699 session_list_ptr
= session_get_list();
4701 /* Set up max poll set size */
4702 lttng_poll_set_max_size();
4706 /* Check for the application socket timeout env variable. */
4707 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4708 if (env_app_timeout
) {
4709 app_socket_timeout
= atoi(env_app_timeout
);
4711 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4716 /* Initialize communication library */
4718 /* This is to get the TCP timeout value. */
4719 lttcomm_inet_init();
4722 * Initialize the health check subsystem. This call should set the
4723 * appropriate time values.
4725 health_sessiond
= health_app_create(HEALTH_NUM_TYPE
);
4726 if (!health_sessiond
) {
4727 PERROR("health_app_create error");
4728 goto exit_health_sessiond_cleanup
;
4730 health_init(health_sessiond
);
4732 /* Create thread to manage the client socket */
4733 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
4734 thread_ht_cleanup
, (void *) NULL
);
4736 PERROR("pthread_create ht_cleanup");
4737 goto exit_ht_cleanup
;
4740 /* Create thread to manage the client socket */
4741 ret
= pthread_create(&health_thread
, NULL
,
4742 thread_manage_health
, (void *) NULL
);
4744 PERROR("pthread_create health");
4748 /* Create thread to manage the client socket */
4749 ret
= pthread_create(&client_thread
, NULL
,
4750 thread_manage_clients
, (void *) NULL
);
4752 PERROR("pthread_create clients");
4756 /* Create thread to dispatch registration */
4757 ret
= pthread_create(&dispatch_thread
, NULL
,
4758 thread_dispatch_ust_registration
, (void *) NULL
);
4760 PERROR("pthread_create dispatch");
4764 /* Create thread to manage application registration. */
4765 ret
= pthread_create(®_apps_thread
, NULL
,
4766 thread_registration_apps
, (void *) NULL
);
4768 PERROR("pthread_create registration");
4772 /* Create thread to manage application socket */
4773 ret
= pthread_create(&apps_thread
, NULL
,
4774 thread_manage_apps
, (void *) NULL
);
4776 PERROR("pthread_create apps");
4780 /* Create thread to manage application notify socket */
4781 ret
= pthread_create(&apps_notify_thread
, NULL
,
4782 ust_thread_manage_notify
, (void *) NULL
);
4784 PERROR("pthread_create apps");
4785 goto exit_apps_notify
;
4788 /* Don't start this thread if kernel tracing is not requested nor root */
4789 if (is_root
&& !opt_no_kernel
) {
4790 /* Create kernel thread to manage kernel event */
4791 ret
= pthread_create(&kernel_thread
, NULL
,
4792 thread_manage_kernel
, (void *) NULL
);
4794 PERROR("pthread_create kernel");
4798 ret
= pthread_join(kernel_thread
, &status
);
4800 PERROR("pthread_join");
4801 goto error
; /* join error, exit without cleanup */
4806 ret
= pthread_join(apps_notify_thread
, &status
);
4808 PERROR("pthread_join apps notify");
4809 goto error
; /* join error, exit without cleanup */
4813 ret
= pthread_join(apps_thread
, &status
);
4815 PERROR("pthread_join apps");
4816 goto error
; /* join error, exit without cleanup */
4821 ret
= pthread_join(reg_apps_thread
, &status
);
4823 PERROR("pthread_join");
4824 goto error
; /* join error, exit without cleanup */
4828 ret
= pthread_join(dispatch_thread
, &status
);
4830 PERROR("pthread_join");
4831 goto error
; /* join error, exit without cleanup */
4835 ret
= pthread_join(client_thread
, &status
);
4837 PERROR("pthread_join");
4838 goto error
; /* join error, exit without cleanup */
4841 ret
= join_consumer_thread(&kconsumer_data
);
4843 PERROR("join_consumer");
4844 goto error
; /* join error, exit without cleanup */
4847 ret
= join_consumer_thread(&ustconsumer32_data
);
4849 PERROR("join_consumer ust32");
4850 goto error
; /* join error, exit without cleanup */
4853 ret
= join_consumer_thread(&ustconsumer64_data
);
4855 PERROR("join_consumer ust64");
4856 goto error
; /* join error, exit without cleanup */
4860 ret
= pthread_join(health_thread
, &status
);
4862 PERROR("pthread_join health thread");
4863 goto error
; /* join error, exit without cleanup */
4867 ret
= pthread_join(ht_cleanup_thread
, &status
);
4869 PERROR("pthread_join ht cleanup thread");
4870 goto error
; /* join error, exit without cleanup */
4873 health_app_destroy(health_sessiond
);
4874 exit_health_sessiond_cleanup
:
4877 * cleanup() is called when no other thread is running.
4879 rcu_thread_online();
4881 rcu_thread_offline();
4882 rcu_unregister_thread();