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 static const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
71 static const char *opt_pidfile
;
72 static int opt_sig_parent
;
73 static int opt_verbose_consumer
;
74 static int opt_daemon
;
75 static int opt_no_kernel
;
76 static int is_root
; /* Set to 1 if the daemon is running as root */
77 static pid_t ppid
; /* Parent PID for --sig-parent option */
81 * Consumer daemon specific control data. Every value not initialized here is
82 * set to 0 by the static definition.
84 static struct consumer_data kconsumer_data
= {
85 .type
= LTTNG_CONSUMER_KERNEL
,
86 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
87 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
90 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
91 .lock
= PTHREAD_MUTEX_INITIALIZER
,
92 .cond
= PTHREAD_COND_INITIALIZER
,
93 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
95 static struct consumer_data ustconsumer64_data
= {
96 .type
= LTTNG_CONSUMER64_UST
,
97 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
98 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
101 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
102 .lock
= PTHREAD_MUTEX_INITIALIZER
,
103 .cond
= PTHREAD_COND_INITIALIZER
,
104 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
106 static struct consumer_data ustconsumer32_data
= {
107 .type
= LTTNG_CONSUMER32_UST
,
108 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
109 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
112 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
113 .lock
= PTHREAD_MUTEX_INITIALIZER
,
114 .cond
= PTHREAD_COND_INITIALIZER
,
115 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
118 /* Shared between threads */
119 static int dispatch_thread_exit
;
121 /* Global application Unix socket path */
122 static char apps_unix_sock_path
[PATH_MAX
];
123 /* Global client Unix socket path */
124 static char client_unix_sock_path
[PATH_MAX
];
125 /* global wait shm path for UST */
126 static char wait_shm_path
[PATH_MAX
];
127 /* Global health check unix path */
128 static char health_unix_sock_path
[PATH_MAX
];
130 /* Sockets and FDs */
131 static int client_sock
= -1;
132 static int apps_sock
= -1;
133 int kernel_tracer_fd
= -1;
134 static int kernel_poll_pipe
[2] = { -1, -1 };
137 * Quit pipe for all threads. This permits a single cancellation point
138 * for all threads when receiving an event on the pipe.
140 static int thread_quit_pipe
[2] = { -1, -1 };
143 * This pipe is used to inform the thread managing application communication
144 * that a command is queued and ready to be processed.
146 static int apps_cmd_pipe
[2] = { -1, -1 };
148 int apps_cmd_notify_pipe
[2] = { -1, -1 };
150 /* Pthread, Mutexes and Semaphores */
151 static pthread_t apps_thread
;
152 static pthread_t apps_notify_thread
;
153 static pthread_t reg_apps_thread
;
154 static pthread_t client_thread
;
155 static pthread_t kernel_thread
;
156 static pthread_t dispatch_thread
;
157 static pthread_t health_thread
;
158 static pthread_t ht_cleanup_thread
;
161 * UST registration command queue. This queue is tied with a futex and uses a N
162 * wakers / 1 waiter implemented and detailed in futex.c/.h
164 * The thread_manage_apps and thread_dispatch_ust_registration interact with
165 * this queue and the wait/wake scheme.
167 static struct ust_cmd_queue ust_cmd_queue
;
170 * Pointer initialized before thread creation.
172 * This points to the tracing session list containing the session count and a
173 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
174 * MUST NOT be taken if you call a public function in session.c.
176 * The lock is nested inside the structure: session_list_ptr->lock. Please use
177 * session_lock_list and session_unlock_list for lock acquisition.
179 static struct ltt_session_list
*session_list_ptr
;
181 int ust_consumerd64_fd
= -1;
182 int ust_consumerd32_fd
= -1;
184 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
185 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
186 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
187 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
189 static const char *module_proc_lttng
= "/proc/lttng";
192 * Consumer daemon state which is changed when spawning it, killing it or in
193 * case of a fatal error.
195 enum consumerd_state
{
196 CONSUMER_STARTED
= 1,
197 CONSUMER_STOPPED
= 2,
202 * This consumer daemon state is used to validate if a client command will be
203 * able to reach the consumer. If not, the client is informed. For instance,
204 * doing a "lttng start" when the consumer state is set to ERROR will return an
205 * error to the client.
207 * The following example shows a possible race condition of this scheme:
209 * consumer thread error happens
211 * client cmd checks state -> still OK
212 * consumer thread exit, sets error
213 * client cmd try to talk to consumer
216 * However, since the consumer is a different daemon, we have no way of making
217 * sure the command will reach it safely even with this state flag. This is why
218 * we consider that up to the state validation during command processing, the
219 * command is safe. After that, we can not guarantee the correctness of the
220 * client request vis-a-vis the consumer.
222 static enum consumerd_state ust_consumerd_state
;
223 static enum consumerd_state kernel_consumerd_state
;
226 * Socket timeout for receiving and sending in seconds.
228 static int app_socket_timeout
;
230 /* Set in main() with the current page size. */
233 /* Application health monitoring */
234 struct health_app
*health_sessiond
;
237 void setup_consumerd_path(void)
239 const char *bin
, *libdir
;
242 * Allow INSTALL_BIN_PATH to be used as a target path for the
243 * native architecture size consumer if CONFIG_CONSUMER*_PATH
244 * has not been defined.
246 #if (CAA_BITS_PER_LONG == 32)
247 if (!consumerd32_bin
[0]) {
248 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
250 if (!consumerd32_libdir
[0]) {
251 consumerd32_libdir
= INSTALL_LIB_PATH
;
253 #elif (CAA_BITS_PER_LONG == 64)
254 if (!consumerd64_bin
[0]) {
255 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
257 if (!consumerd64_libdir
[0]) {
258 consumerd64_libdir
= INSTALL_LIB_PATH
;
261 #error "Unknown bitness"
265 * runtime env. var. overrides the build default.
267 bin
= getenv("LTTNG_CONSUMERD32_BIN");
269 consumerd32_bin
= bin
;
271 bin
= getenv("LTTNG_CONSUMERD64_BIN");
273 consumerd64_bin
= bin
;
275 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
277 consumerd32_libdir
= libdir
;
279 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
281 consumerd64_libdir
= libdir
;
286 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
288 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
294 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
300 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
312 * Check if the thread quit pipe was triggered.
314 * Return 1 if it was triggered else 0;
316 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
318 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
326 * Init thread quit pipe.
328 * Return -1 on error or 0 if all pipes are created.
330 static int init_thread_quit_pipe(void)
334 ret
= pipe(thread_quit_pipe
);
336 PERROR("thread quit pipe");
340 for (i
= 0; i
< 2; i
++) {
341 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
353 * Stop all threads by closing the thread quit pipe.
355 static void stop_threads(void)
359 /* Stopping all threads */
360 DBG("Terminating all threads");
361 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
363 ERR("write error on thread quit pipe");
366 /* Dispatch thread */
367 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
368 futex_nto1_wake(&ust_cmd_queue
.futex
);
372 * Close every consumer sockets.
374 static void close_consumer_sockets(void)
378 if (kconsumer_data
.err_sock
>= 0) {
379 ret
= close(kconsumer_data
.err_sock
);
381 PERROR("kernel consumer err_sock close");
384 if (ustconsumer32_data
.err_sock
>= 0) {
385 ret
= close(ustconsumer32_data
.err_sock
);
387 PERROR("UST consumerd32 err_sock close");
390 if (ustconsumer64_data
.err_sock
>= 0) {
391 ret
= close(ustconsumer64_data
.err_sock
);
393 PERROR("UST consumerd64 err_sock close");
396 if (kconsumer_data
.cmd_sock
>= 0) {
397 ret
= close(kconsumer_data
.cmd_sock
);
399 PERROR("kernel consumer cmd_sock close");
402 if (ustconsumer32_data
.cmd_sock
>= 0) {
403 ret
= close(ustconsumer32_data
.cmd_sock
);
405 PERROR("UST consumerd32 cmd_sock close");
408 if (ustconsumer64_data
.cmd_sock
>= 0) {
409 ret
= close(ustconsumer64_data
.cmd_sock
);
411 PERROR("UST consumerd64 cmd_sock close");
419 static void cleanup(void)
422 struct ltt_session
*sess
, *stmp
;
428 * Close the thread quit pipe. It has already done its job,
429 * since we are now called.
431 utils_close_pipe(thread_quit_pipe
);
434 * If opt_pidfile is undefined, the default file will be wiped when
435 * removing the rundir.
438 ret
= remove(opt_pidfile
);
440 PERROR("remove pidfile %s", opt_pidfile
);
444 DBG("Removing sessiond and consumerd content of directory %s", rundir
);
447 snprintf(path
, PATH_MAX
,
449 rundir
, DEFAULT_LTTNG_SESSIOND_PIDFILE
);
450 DBG("Removing %s", path
);
454 snprintf(path
, PATH_MAX
,
455 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
457 DBG("Removing %s", path
);
460 snprintf(path
, PATH_MAX
,
461 DEFAULT_KCONSUMERD_PATH
,
463 DBG("Removing directory %s", path
);
466 /* ust consumerd 32 */
467 snprintf(path
, PATH_MAX
,
468 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
470 DBG("Removing %s", path
);
473 snprintf(path
, PATH_MAX
,
474 DEFAULT_USTCONSUMERD32_PATH
,
476 DBG("Removing directory %s", path
);
479 /* ust consumerd 64 */
480 snprintf(path
, PATH_MAX
,
481 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
483 DBG("Removing %s", path
);
486 snprintf(path
, PATH_MAX
,
487 DEFAULT_USTCONSUMERD64_PATH
,
489 DBG("Removing directory %s", path
);
494 DBG("Cleaning up all sessions");
496 /* Destroy session list mutex */
497 if (session_list_ptr
!= NULL
) {
498 pthread_mutex_destroy(&session_list_ptr
->lock
);
500 /* Cleanup ALL session */
501 cds_list_for_each_entry_safe(sess
, stmp
,
502 &session_list_ptr
->head
, list
) {
503 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
507 DBG("Closing all UST sockets");
508 ust_app_clean_list();
509 buffer_reg_destroy_registries();
511 if (is_root
&& !opt_no_kernel
) {
512 DBG2("Closing kernel fd");
513 if (kernel_tracer_fd
>= 0) {
514 ret
= close(kernel_tracer_fd
);
519 DBG("Unloading kernel modules");
520 modprobe_remove_lttng_all();
523 close_consumer_sockets();
526 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
527 "Matthew, BEET driven development works!%c[%dm",
528 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
533 * Send data on a unix socket using the liblttsessiondcomm API.
535 * Return lttcomm error code.
537 static int send_unix_sock(int sock
, void *buf
, size_t len
)
539 /* Check valid length */
544 return lttcomm_send_unix_sock(sock
, buf
, len
);
548 * Free memory of a command context structure.
550 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
552 DBG("Clean command context structure");
554 if ((*cmd_ctx
)->llm
) {
555 free((*cmd_ctx
)->llm
);
557 if ((*cmd_ctx
)->lsm
) {
558 free((*cmd_ctx
)->lsm
);
566 * Notify UST applications using the shm mmap futex.
568 static int notify_ust_apps(int active
)
572 DBG("Notifying applications of session daemon state: %d", active
);
574 /* See shm.c for this call implying mmap, shm and futex calls */
575 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
576 if (wait_shm_mmap
== NULL
) {
580 /* Wake waiting process */
581 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
583 /* Apps notified successfully */
591 * Setup the outgoing data buffer for the response (llm) by allocating the
592 * right amount of memory and copying the original information from the lsm
595 * Return total size of the buffer pointed by buf.
597 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
603 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
604 if (cmd_ctx
->llm
== NULL
) {
610 /* Copy common data */
611 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
612 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
614 cmd_ctx
->llm
->data_size
= size
;
615 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
624 * Update the kernel poll set of all channel fd available over all tracing
625 * session. Add the wakeup pipe at the end of the set.
627 static int update_kernel_poll(struct lttng_poll_event
*events
)
630 struct ltt_session
*session
;
631 struct ltt_kernel_channel
*channel
;
633 DBG("Updating kernel poll set");
636 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
637 session_lock(session
);
638 if (session
->kernel_session
== NULL
) {
639 session_unlock(session
);
643 cds_list_for_each_entry(channel
,
644 &session
->kernel_session
->channel_list
.head
, list
) {
645 /* Add channel fd to the kernel poll set */
646 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
648 session_unlock(session
);
651 DBG("Channel fd %d added to kernel set", channel
->fd
);
653 session_unlock(session
);
655 session_unlock_list();
660 session_unlock_list();
665 * Find the channel fd from 'fd' over all tracing session. When found, check
666 * for new channel stream and send those stream fds to the kernel consumer.
668 * Useful for CPU hotplug feature.
670 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
673 struct ltt_session
*session
;
674 struct ltt_kernel_session
*ksess
;
675 struct ltt_kernel_channel
*channel
;
677 DBG("Updating kernel streams for channel fd %d", fd
);
680 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
681 session_lock(session
);
682 if (session
->kernel_session
== NULL
) {
683 session_unlock(session
);
686 ksess
= session
->kernel_session
;
688 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
689 if (channel
->fd
== fd
) {
690 DBG("Channel found, updating kernel streams");
691 ret
= kernel_open_channel_stream(channel
);
695 /* Update the stream global counter */
696 ksess
->stream_count_global
+= ret
;
699 * Have we already sent fds to the consumer? If yes, it means
700 * that tracing is started so it is safe to send our updated
703 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
704 struct lttng_ht_iter iter
;
705 struct consumer_socket
*socket
;
708 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
709 &iter
.iter
, socket
, node
.node
) {
710 pthread_mutex_lock(socket
->lock
);
711 ret
= kernel_consumer_send_channel_stream(socket
,
713 session
->output_traces
? 1 : 0);
714 pthread_mutex_unlock(socket
->lock
);
725 session_unlock(session
);
727 session_unlock_list();
731 session_unlock(session
);
732 session_unlock_list();
737 * For each tracing session, update newly registered apps. The session list
738 * lock MUST be acquired before calling this.
740 static void update_ust_app(int app_sock
)
742 struct ltt_session
*sess
, *stmp
;
744 /* Consumer is in an ERROR state. Stop any application update. */
745 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
746 /* Stop the update process since the consumer is dead. */
750 /* For all tracing session(s) */
751 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
753 if (sess
->ust_session
) {
754 ust_app_global_update(sess
->ust_session
, app_sock
);
756 session_unlock(sess
);
761 * This thread manage event coming from the kernel.
763 * Features supported in this thread:
766 static void *thread_manage_kernel(void *data
)
768 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
769 uint32_t revents
, nb_fd
;
771 struct lttng_poll_event events
;
773 DBG("[thread] Thread manage kernel started");
775 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_KERNEL
);
778 * This first step of the while is to clean this structure which could free
779 * non NULL pointers so initialize it before the loop.
781 lttng_poll_init(&events
);
783 if (testpoint(thread_manage_kernel
)) {
784 goto error_testpoint
;
787 health_code_update();
789 if (testpoint(thread_manage_kernel_before_loop
)) {
790 goto error_testpoint
;
794 health_code_update();
796 if (update_poll_flag
== 1) {
797 /* Clean events object. We are about to populate it again. */
798 lttng_poll_clean(&events
);
800 ret
= sessiond_set_thread_pollset(&events
, 2);
802 goto error_poll_create
;
805 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
810 /* This will add the available kernel channel if any. */
811 ret
= update_kernel_poll(&events
);
815 update_poll_flag
= 0;
818 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
820 /* Poll infinite value of time */
823 ret
= lttng_poll_wait(&events
, -1);
827 * Restart interrupted system call.
829 if (errno
== EINTR
) {
833 } else if (ret
== 0) {
834 /* Should not happen since timeout is infinite */
835 ERR("Return value of poll is 0 with an infinite timeout.\n"
836 "This should not have happened! Continuing...");
842 for (i
= 0; i
< nb_fd
; i
++) {
843 /* Fetch once the poll data */
844 revents
= LTTNG_POLL_GETEV(&events
, i
);
845 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
847 health_code_update();
849 /* Thread quit pipe has been closed. Killing thread. */
850 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
856 /* Check for data on kernel pipe */
857 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
859 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
860 } while (ret
< 0 && errno
== EINTR
);
862 * Ret value is useless here, if this pipe gets any actions an
863 * update is required anyway.
865 update_poll_flag
= 1;
869 * New CPU detected by the kernel. Adding kernel stream to
870 * kernel session and updating the kernel consumer
872 if (revents
& LPOLLIN
) {
873 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
879 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
880 * and unregister kernel stream at this point.
889 lttng_poll_clean(&events
);
892 utils_close_pipe(kernel_poll_pipe
);
893 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
896 ERR("Health error occurred in %s", __func__
);
897 WARN("Kernel thread died unexpectedly. "
898 "Kernel tracing can continue but CPU hotplug is disabled.");
900 health_unregister(health_sessiond
);
901 DBG("Kernel thread dying");
906 * Signal pthread condition of the consumer data that the thread.
908 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
910 pthread_mutex_lock(&data
->cond_mutex
);
913 * The state is set before signaling. It can be any value, it's the waiter
914 * job to correctly interpret this condition variable associated to the
915 * consumer pthread_cond.
917 * A value of 0 means that the corresponding thread of the consumer data
918 * was not started. 1 indicates that the thread has started and is ready
919 * for action. A negative value means that there was an error during the
922 data
->consumer_thread_is_ready
= state
;
923 (void) pthread_cond_signal(&data
->cond
);
925 pthread_mutex_unlock(&data
->cond_mutex
);
929 * This thread manage the consumer error sent back to the session daemon.
931 static void *thread_manage_consumer(void *data
)
933 int sock
= -1, i
, ret
, pollfd
, err
= -1;
934 uint32_t revents
, nb_fd
;
935 enum lttcomm_return_code code
;
936 struct lttng_poll_event events
;
937 struct consumer_data
*consumer_data
= data
;
939 DBG("[thread] Manage consumer started");
941 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
943 health_code_update();
946 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
947 * metadata_sock. Nothing more will be added to this poll set.
949 ret
= sessiond_set_thread_pollset(&events
, 3);
955 * The error socket here is already in a listening state which was done
956 * just before spawning this thread to avoid a race between the consumer
957 * daemon exec trying to connect and the listen() call.
959 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
964 health_code_update();
966 /* Infinite blocking call, waiting for transmission */
970 if (testpoint(thread_manage_consumer
)) {
974 ret
= lttng_poll_wait(&events
, -1);
978 * Restart interrupted system call.
980 if (errno
== EINTR
) {
988 for (i
= 0; i
< nb_fd
; i
++) {
989 /* Fetch once the poll data */
990 revents
= LTTNG_POLL_GETEV(&events
, i
);
991 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
993 health_code_update();
995 /* Thread quit pipe has been closed. Killing thread. */
996 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1002 /* Event on the registration socket */
1003 if (pollfd
== consumer_data
->err_sock
) {
1004 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1005 ERR("consumer err socket poll error");
1011 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1017 * Set the CLOEXEC flag. Return code is useless because either way, the
1020 (void) utils_set_fd_cloexec(sock
);
1022 health_code_update();
1024 DBG2("Receiving code from consumer err_sock");
1026 /* Getting status code from kconsumerd */
1027 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1028 sizeof(enum lttcomm_return_code
));
1033 health_code_update();
1035 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1036 /* Connect both socket, command and metadata. */
1037 consumer_data
->cmd_sock
=
1038 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1039 consumer_data
->metadata_fd
=
1040 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1041 if (consumer_data
->cmd_sock
< 0
1042 || consumer_data
->metadata_fd
< 0) {
1043 PERROR("consumer connect cmd socket");
1044 /* On error, signal condition and quit. */
1045 signal_consumer_condition(consumer_data
, -1);
1048 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1049 /* Create metadata socket lock. */
1050 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1051 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1052 PERROR("zmalloc pthread mutex");
1056 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1058 signal_consumer_condition(consumer_data
, 1);
1059 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1060 DBG("Consumer metadata socket ready (fd: %d)",
1061 consumer_data
->metadata_fd
);
1063 ERR("consumer error when waiting for SOCK_READY : %s",
1064 lttcomm_get_readable_code(-code
));
1068 /* Remove the consumerd error sock since we've established a connexion */
1069 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1074 /* Add new accepted error socket. */
1075 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1080 /* Add metadata socket that is successfully connected. */
1081 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1082 LPOLLIN
| LPOLLRDHUP
);
1087 health_code_update();
1089 /* Infinite blocking call, waiting for transmission */
1092 health_poll_entry();
1093 ret
= lttng_poll_wait(&events
, -1);
1097 * Restart interrupted system call.
1099 if (errno
== EINTR
) {
1107 for (i
= 0; i
< nb_fd
; i
++) {
1108 /* Fetch once the poll data */
1109 revents
= LTTNG_POLL_GETEV(&events
, i
);
1110 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1112 health_code_update();
1114 /* Thread quit pipe has been closed. Killing thread. */
1115 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1121 if (pollfd
== sock
) {
1122 /* Event on the consumerd socket */
1123 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1124 ERR("consumer err socket second poll error");
1127 health_code_update();
1128 /* Wait for any kconsumerd error */
1129 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1130 sizeof(enum lttcomm_return_code
));
1132 ERR("consumer closed the command socket");
1136 ERR("consumer return code : %s",
1137 lttcomm_get_readable_code(-code
));
1140 } else if (pollfd
== consumer_data
->metadata_fd
) {
1141 /* UST metadata requests */
1142 ret
= ust_consumer_metadata_request(
1143 &consumer_data
->metadata_sock
);
1145 ERR("Handling metadata request");
1150 ERR("Unknown pollfd");
1154 health_code_update();
1160 * We lock here because we are about to close the sockets and some other
1161 * thread might be using them so get exclusive access which will abort all
1162 * other consumer command by other threads.
1164 pthread_mutex_lock(&consumer_data
->lock
);
1166 /* Immediately set the consumerd state to stopped */
1167 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1168 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1169 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1170 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1171 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1173 /* Code flow error... */
1177 if (consumer_data
->err_sock
>= 0) {
1178 ret
= close(consumer_data
->err_sock
);
1182 consumer_data
->err_sock
= -1;
1184 if (consumer_data
->cmd_sock
>= 0) {
1185 ret
= close(consumer_data
->cmd_sock
);
1189 consumer_data
->cmd_sock
= -1;
1191 if (*consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1192 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1205 unlink(consumer_data
->err_unix_sock_path
);
1206 unlink(consumer_data
->cmd_unix_sock_path
);
1207 consumer_data
->pid
= 0;
1208 pthread_mutex_unlock(&consumer_data
->lock
);
1210 /* Cleanup metadata socket mutex. */
1211 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1212 free(consumer_data
->metadata_sock
.lock
);
1214 lttng_poll_clean(&events
);
1218 ERR("Health error occurred in %s", __func__
);
1220 health_unregister(health_sessiond
);
1221 DBG("consumer thread cleanup completed");
1227 * This thread manage application communication.
1229 static void *thread_manage_apps(void *data
)
1231 int i
, ret
, pollfd
, err
= -1;
1232 uint32_t revents
, nb_fd
;
1233 struct lttng_poll_event events
;
1235 DBG("[thread] Manage application started");
1237 rcu_register_thread();
1238 rcu_thread_online();
1240 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1242 if (testpoint(thread_manage_apps
)) {
1243 goto error_testpoint
;
1246 health_code_update();
1248 ret
= sessiond_set_thread_pollset(&events
, 2);
1250 goto error_poll_create
;
1253 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1258 if (testpoint(thread_manage_apps_before_loop
)) {
1262 health_code_update();
1265 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1267 /* Inifinite blocking call, waiting for transmission */
1269 health_poll_entry();
1270 ret
= lttng_poll_wait(&events
, -1);
1274 * Restart interrupted system call.
1276 if (errno
== EINTR
) {
1284 for (i
= 0; i
< nb_fd
; i
++) {
1285 /* Fetch once the poll data */
1286 revents
= LTTNG_POLL_GETEV(&events
, i
);
1287 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1289 health_code_update();
1291 /* Thread quit pipe has been closed. Killing thread. */
1292 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1298 /* Inspect the apps cmd pipe */
1299 if (pollfd
== apps_cmd_pipe
[0]) {
1300 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1301 ERR("Apps command pipe error");
1303 } else if (revents
& LPOLLIN
) {
1308 ret
= read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1309 } while (ret
< 0 && errno
== EINTR
);
1310 if (ret
< 0 || ret
< sizeof(sock
)) {
1311 PERROR("read apps cmd pipe");
1315 health_code_update();
1318 * We only monitor the error events of the socket. This
1319 * thread does not handle any incoming data from UST
1322 ret
= lttng_poll_add(&events
, sock
,
1323 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1329 * Set socket timeout for both receiving and ending.
1330 * app_socket_timeout is in seconds, whereas
1331 * lttcomm_setsockopt_rcv_timeout and
1332 * lttcomm_setsockopt_snd_timeout expect msec as
1335 (void) lttcomm_setsockopt_rcv_timeout(sock
,
1336 app_socket_timeout
* 1000);
1337 (void) lttcomm_setsockopt_snd_timeout(sock
,
1338 app_socket_timeout
* 1000);
1340 DBG("Apps with sock %d added to poll set", sock
);
1342 health_code_update();
1348 * At this point, we know that a registered application made
1349 * the event at poll_wait.
1351 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1352 /* Removing from the poll set */
1353 ret
= lttng_poll_del(&events
, pollfd
);
1358 /* Socket closed on remote end. */
1359 ust_app_unregister(pollfd
);
1364 health_code_update();
1370 lttng_poll_clean(&events
);
1373 utils_close_pipe(apps_cmd_pipe
);
1374 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1377 * We don't clean the UST app hash table here since already registered
1378 * applications can still be controlled so let them be until the session
1379 * daemon dies or the applications stop.
1384 ERR("Health error occurred in %s", __func__
);
1386 health_unregister(health_sessiond
);
1387 DBG("Application communication apps thread cleanup complete");
1388 rcu_thread_offline();
1389 rcu_unregister_thread();
1394 * Send a socket to a thread This is called from the dispatch UST registration
1395 * thread once all sockets are set for the application.
1397 * The sock value can be invalid, we don't really care, the thread will handle
1398 * it and make the necessary cleanup if so.
1400 * On success, return 0 else a negative value being the errno message of the
1403 static int send_socket_to_thread(int fd
, int sock
)
1408 * It's possible that the FD is set as invalid with -1 concurrently just
1409 * before calling this function being a shutdown state of the thread.
1417 ret
= write(fd
, &sock
, sizeof(sock
));
1418 } while (ret
< 0 && errno
== EINTR
);
1419 if (ret
< 0 || ret
!= sizeof(sock
)) {
1420 PERROR("write apps pipe %d", fd
);
1427 /* All good. Don't send back the write positive ret value. */
1434 * Sanitize the wait queue of the dispatch registration thread meaning removing
1435 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1436 * notify socket is never received.
1438 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1440 int ret
, nb_fd
= 0, i
;
1441 unsigned int fd_added
= 0;
1442 struct lttng_poll_event events
;
1443 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1447 lttng_poll_init(&events
);
1449 /* Just skip everything for an empty queue. */
1450 if (!wait_queue
->count
) {
1454 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1459 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1460 &wait_queue
->head
, head
) {
1461 assert(wait_node
->app
);
1462 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1463 LPOLLHUP
| LPOLLERR
);
1476 * Poll but don't block so we can quickly identify the faulty events and
1477 * clean them afterwards from the wait queue.
1479 ret
= lttng_poll_wait(&events
, 0);
1485 for (i
= 0; i
< nb_fd
; i
++) {
1486 /* Get faulty FD. */
1487 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1488 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1490 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1491 &wait_queue
->head
, head
) {
1492 if (pollfd
== wait_node
->app
->sock
&&
1493 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1494 cds_list_del(&wait_node
->head
);
1495 wait_queue
->count
--;
1496 ust_app_destroy(wait_node
->app
);
1504 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1508 lttng_poll_clean(&events
);
1512 lttng_poll_clean(&events
);
1514 ERR("Unable to sanitize wait queue");
1519 * Dispatch request from the registration threads to the application
1520 * communication thread.
1522 static void *thread_dispatch_ust_registration(void *data
)
1525 struct cds_wfq_node
*node
;
1526 struct ust_command
*ust_cmd
= NULL
;
1527 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1528 struct ust_reg_wait_queue wait_queue
= {
1532 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1534 health_code_update();
1536 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1538 DBG("[thread] Dispatch UST command started");
1540 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1541 health_code_update();
1543 /* Atomically prepare the queue futex */
1544 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1547 struct ust_app
*app
= NULL
;
1551 * Make sure we don't have node(s) that have hung up before receiving
1552 * the notify socket. This is to clean the list in order to avoid
1553 * memory leaks from notify socket that are never seen.
1555 sanitize_wait_queue(&wait_queue
);
1557 health_code_update();
1558 /* Dequeue command for registration */
1559 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1561 DBG("Woken up but nothing in the UST command queue");
1562 /* Continue thread execution */
1566 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1568 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1569 " gid:%d sock:%d name:%s (version %d.%d)",
1570 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1571 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1572 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1573 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1575 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1576 wait_node
= zmalloc(sizeof(*wait_node
));
1578 PERROR("zmalloc wait_node dispatch");
1579 ret
= close(ust_cmd
->sock
);
1581 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1583 lttng_fd_put(1, LTTNG_FD_APPS
);
1587 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1589 /* Create application object if socket is CMD. */
1590 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1592 if (!wait_node
->app
) {
1593 ret
= close(ust_cmd
->sock
);
1595 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1597 lttng_fd_put(1, LTTNG_FD_APPS
);
1603 * Add application to the wait queue so we can set the notify
1604 * socket before putting this object in the global ht.
1606 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1611 * We have to continue here since we don't have the notify
1612 * socket and the application MUST be added to the hash table
1613 * only at that moment.
1618 * Look for the application in the local wait queue and set the
1619 * notify socket if found.
1621 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1622 &wait_queue
.head
, head
) {
1623 health_code_update();
1624 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1625 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1626 cds_list_del(&wait_node
->head
);
1628 app
= wait_node
->app
;
1630 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1636 * With no application at this stage the received socket is
1637 * basically useless so close it before we free the cmd data
1638 * structure for good.
1641 ret
= close(ust_cmd
->sock
);
1643 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1645 lttng_fd_put(1, LTTNG_FD_APPS
);
1652 * @session_lock_list
1654 * Lock the global session list so from the register up to the
1655 * registration done message, no thread can see the application
1656 * and change its state.
1658 session_lock_list();
1662 * Add application to the global hash table. This needs to be
1663 * done before the update to the UST registry can locate the
1668 /* Set app version. This call will print an error if needed. */
1669 (void) ust_app_version(app
);
1671 /* Send notify socket through the notify pipe. */
1672 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1676 session_unlock_list();
1678 * No notify thread, stop the UST tracing. However, this is
1679 * not an internal error of the this thread thus setting
1680 * the health error code to a normal exit.
1687 * Update newly registered application with the tracing
1688 * registry info already enabled information.
1690 update_ust_app(app
->sock
);
1693 * Don't care about return value. Let the manage apps threads
1694 * handle app unregistration upon socket close.
1696 (void) ust_app_register_done(app
->sock
);
1699 * Even if the application socket has been closed, send the app
1700 * to the thread and unregistration will take place at that
1703 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1706 session_unlock_list();
1708 * No apps. thread, stop the UST tracing. However, this is
1709 * not an internal error of the this thread thus setting
1710 * the health error code to a normal exit.
1717 session_unlock_list();
1719 } while (node
!= NULL
);
1721 health_poll_entry();
1722 /* Futex wait on queue. Blocking call on futex() */
1723 futex_nto1_wait(&ust_cmd_queue
.futex
);
1726 /* Normal exit, no error */
1730 /* Clean up wait queue. */
1731 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1732 &wait_queue
.head
, head
) {
1733 cds_list_del(&wait_node
->head
);
1738 DBG("Dispatch thread dying");
1741 ERR("Health error occurred in %s", __func__
);
1743 health_unregister(health_sessiond
);
1748 * This thread manage application registration.
1750 static void *thread_registration_apps(void *data
)
1752 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1753 uint32_t revents
, nb_fd
;
1754 struct lttng_poll_event events
;
1756 * Get allocated in this thread, enqueued to a global queue, dequeued and
1757 * freed in the manage apps thread.
1759 struct ust_command
*ust_cmd
= NULL
;
1761 DBG("[thread] Manage application registration started");
1763 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
1765 if (testpoint(thread_registration_apps
)) {
1766 goto error_testpoint
;
1769 ret
= lttcomm_listen_unix_sock(apps_sock
);
1775 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1776 * more will be added to this poll set.
1778 ret
= sessiond_set_thread_pollset(&events
, 2);
1780 goto error_create_poll
;
1783 /* Add the application registration socket */
1784 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1786 goto error_poll_add
;
1789 /* Notify all applications to register */
1790 ret
= notify_ust_apps(1);
1792 ERR("Failed to notify applications or create the wait shared memory.\n"
1793 "Execution continues but there might be problem for already\n"
1794 "running applications that wishes to register.");
1798 DBG("Accepting application registration");
1800 /* Inifinite blocking call, waiting for transmission */
1802 health_poll_entry();
1803 ret
= lttng_poll_wait(&events
, -1);
1807 * Restart interrupted system call.
1809 if (errno
== EINTR
) {
1817 for (i
= 0; i
< nb_fd
; i
++) {
1818 health_code_update();
1820 /* Fetch once the poll data */
1821 revents
= LTTNG_POLL_GETEV(&events
, i
);
1822 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1824 /* Thread quit pipe has been closed. Killing thread. */
1825 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1831 /* Event on the registration socket */
1832 if (pollfd
== apps_sock
) {
1833 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1834 ERR("Register apps socket poll error");
1836 } else if (revents
& LPOLLIN
) {
1837 sock
= lttcomm_accept_unix_sock(apps_sock
);
1843 * Set the CLOEXEC flag. Return code is useless because
1844 * either way, the show must go on.
1846 (void) utils_set_fd_cloexec(sock
);
1848 /* Create UST registration command for enqueuing */
1849 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1850 if (ust_cmd
== NULL
) {
1851 PERROR("ust command zmalloc");
1856 * Using message-based transmissions to ensure we don't
1857 * have to deal with partially received messages.
1859 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1861 ERR("Exhausted file descriptors allowed for applications.");
1871 health_code_update();
1872 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
1875 /* Close socket of the application. */
1880 lttng_fd_put(LTTNG_FD_APPS
, 1);
1884 health_code_update();
1886 ust_cmd
->sock
= sock
;
1889 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1890 " gid:%d sock:%d name:%s (version %d.%d)",
1891 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1892 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1893 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1894 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1897 * Lock free enqueue the registration request. The red pill
1898 * has been taken! This apps will be part of the *system*.
1900 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1903 * Wake the registration queue futex. Implicit memory
1904 * barrier with the exchange in cds_wfq_enqueue.
1906 futex_nto1_wake(&ust_cmd_queue
.futex
);
1916 ERR("Health error occurred in %s", __func__
);
1919 /* Notify that the registration thread is gone */
1922 if (apps_sock
>= 0) {
1923 ret
= close(apps_sock
);
1933 lttng_fd_put(LTTNG_FD_APPS
, 1);
1935 unlink(apps_unix_sock_path
);
1938 lttng_poll_clean(&events
);
1942 DBG("UST Registration thread cleanup complete");
1943 health_unregister(health_sessiond
);
1949 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1950 * exec or it will fails.
1952 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1955 struct timespec timeout
;
1957 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1958 consumer_data
->consumer_thread_is_ready
= 0;
1960 /* Setup pthread condition */
1961 ret
= pthread_condattr_init(&consumer_data
->condattr
);
1964 PERROR("pthread_condattr_init consumer data");
1969 * Set the monotonic clock in order to make sure we DO NOT jump in time
1970 * between the clock_gettime() call and the timedwait call. See bug #324
1971 * for a more details and how we noticed it.
1973 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
1976 PERROR("pthread_condattr_setclock consumer data");
1980 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
1983 PERROR("pthread_cond_init consumer data");
1987 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
1990 PERROR("pthread_create consumer");
1995 /* We are about to wait on a pthread condition */
1996 pthread_mutex_lock(&consumer_data
->cond_mutex
);
1998 /* Get time for sem_timedwait absolute timeout */
1999 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2001 * Set the timeout for the condition timed wait even if the clock gettime
2002 * call fails since we might loop on that call and we want to avoid to
2003 * increment the timeout too many times.
2005 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2008 * The following loop COULD be skipped in some conditions so this is why we
2009 * set ret to 0 in order to make sure at least one round of the loop is
2015 * Loop until the condition is reached or when a timeout is reached. Note
2016 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2017 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2018 * possible. This loop does not take any chances and works with both of
2021 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2022 if (clock_ret
< 0) {
2023 PERROR("clock_gettime spawn consumer");
2024 /* Infinite wait for the consumerd thread to be ready */
2025 ret
= pthread_cond_wait(&consumer_data
->cond
,
2026 &consumer_data
->cond_mutex
);
2028 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2029 &consumer_data
->cond_mutex
, &timeout
);
2033 /* Release the pthread condition */
2034 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2038 if (ret
== ETIMEDOUT
) {
2040 * Call has timed out so we kill the kconsumerd_thread and return
2043 ERR("Condition timed out. The consumer thread was never ready."
2045 ret
= pthread_cancel(consumer_data
->thread
);
2047 PERROR("pthread_cancel consumer thread");
2050 PERROR("pthread_cond_wait failed consumer thread");
2055 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2056 if (consumer_data
->pid
== 0) {
2057 ERR("Consumerd did not start");
2058 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2061 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2070 * Join consumer thread
2072 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2076 /* Consumer pid must be a real one. */
2077 if (consumer_data
->pid
> 0) {
2079 ret
= kill(consumer_data
->pid
, SIGTERM
);
2081 ERR("Error killing consumer daemon");
2084 return pthread_join(consumer_data
->thread
, &status
);
2091 * Fork and exec a consumer daemon (consumerd).
2093 * Return pid if successful else -1.
2095 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2099 const char *consumer_to_use
;
2100 const char *verbosity
;
2103 DBG("Spawning consumerd");
2110 if (opt_verbose_consumer
) {
2111 verbosity
= "--verbose";
2113 verbosity
= "--quiet";
2115 switch (consumer_data
->type
) {
2116 case LTTNG_CONSUMER_KERNEL
:
2118 * Find out which consumerd to execute. We will first try the
2119 * 64-bit path, then the sessiond's installation directory, and
2120 * fallback on the 32-bit one,
2122 DBG3("Looking for a kernel consumer at these locations:");
2123 DBG3(" 1) %s", consumerd64_bin
);
2124 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2125 DBG3(" 3) %s", consumerd32_bin
);
2126 if (stat(consumerd64_bin
, &st
) == 0) {
2127 DBG3("Found location #1");
2128 consumer_to_use
= consumerd64_bin
;
2129 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2130 DBG3("Found location #2");
2131 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2132 } else if (stat(consumerd32_bin
, &st
) == 0) {
2133 DBG3("Found location #3");
2134 consumer_to_use
= consumerd32_bin
;
2136 DBG("Could not find any valid consumerd executable");
2139 DBG("Using kernel consumer at: %s", consumer_to_use
);
2140 execl(consumer_to_use
,
2141 "lttng-consumerd", verbosity
, "-k",
2142 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2143 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2144 "--group", tracing_group_name
,
2147 case LTTNG_CONSUMER64_UST
:
2149 char *tmpnew
= NULL
;
2151 if (consumerd64_libdir
[0] != '\0') {
2155 tmp
= getenv("LD_LIBRARY_PATH");
2159 tmplen
= strlen("LD_LIBRARY_PATH=")
2160 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2161 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2166 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2167 strcat(tmpnew
, consumerd64_libdir
);
2168 if (tmp
[0] != '\0') {
2169 strcat(tmpnew
, ":");
2170 strcat(tmpnew
, tmp
);
2172 ret
= putenv(tmpnew
);
2179 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2180 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2181 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2182 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2183 "--group", tracing_group_name
,
2185 if (consumerd64_libdir
[0] != '\0') {
2193 case LTTNG_CONSUMER32_UST
:
2195 char *tmpnew
= NULL
;
2197 if (consumerd32_libdir
[0] != '\0') {
2201 tmp
= getenv("LD_LIBRARY_PATH");
2205 tmplen
= strlen("LD_LIBRARY_PATH=")
2206 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2207 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2212 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2213 strcat(tmpnew
, consumerd32_libdir
);
2214 if (tmp
[0] != '\0') {
2215 strcat(tmpnew
, ":");
2216 strcat(tmpnew
, tmp
);
2218 ret
= putenv(tmpnew
);
2225 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2226 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2227 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2228 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2229 "--group", tracing_group_name
,
2231 if (consumerd32_libdir
[0] != '\0') {
2240 PERROR("unknown consumer type");
2244 PERROR("kernel start consumer exec");
2247 } else if (pid
> 0) {
2250 PERROR("start consumer fork");
2258 * Spawn the consumerd daemon and session daemon thread.
2260 static int start_consumerd(struct consumer_data
*consumer_data
)
2265 * Set the listen() state on the socket since there is a possible race
2266 * between the exec() of the consumer daemon and this call if place in the
2267 * consumer thread. See bug #366 for more details.
2269 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2274 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2275 if (consumer_data
->pid
!= 0) {
2276 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2280 ret
= spawn_consumerd(consumer_data
);
2282 ERR("Spawning consumerd failed");
2283 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2287 /* Setting up the consumer_data pid */
2288 consumer_data
->pid
= ret
;
2289 DBG2("Consumer pid %d", consumer_data
->pid
);
2290 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2292 DBG2("Spawning consumer control thread");
2293 ret
= spawn_consumer_thread(consumer_data
);
2295 ERR("Fatal error spawning consumer control thread");
2303 /* Cleanup already created sockets on error. */
2304 if (consumer_data
->err_sock
>= 0) {
2307 err
= close(consumer_data
->err_sock
);
2309 PERROR("close consumer data error socket");
2316 * Setup necessary data for kernel tracer action.
2318 static int init_kernel_tracer(void)
2322 /* Modprobe lttng kernel modules */
2323 ret
= modprobe_lttng_control();
2328 /* Open debugfs lttng */
2329 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2330 if (kernel_tracer_fd
< 0) {
2331 DBG("Failed to open %s", module_proc_lttng
);
2336 /* Validate kernel version */
2337 ret
= kernel_validate_version(kernel_tracer_fd
);
2342 ret
= modprobe_lttng_data();
2347 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2351 modprobe_remove_lttng_control();
2352 ret
= close(kernel_tracer_fd
);
2356 kernel_tracer_fd
= -1;
2357 return LTTNG_ERR_KERN_VERSION
;
2360 ret
= close(kernel_tracer_fd
);
2366 modprobe_remove_lttng_control();
2369 WARN("No kernel tracer available");
2370 kernel_tracer_fd
= -1;
2372 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2374 return LTTNG_ERR_KERN_NA
;
2380 * Copy consumer output from the tracing session to the domain session. The
2381 * function also applies the right modification on a per domain basis for the
2382 * trace files destination directory.
2384 * Should *NOT* be called with RCU read-side lock held.
2386 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2389 const char *dir_name
;
2390 struct consumer_output
*consumer
;
2393 assert(session
->consumer
);
2396 case LTTNG_DOMAIN_KERNEL
:
2397 DBG3("Copying tracing session consumer output in kernel session");
2399 * XXX: We should audit the session creation and what this function
2400 * does "extra" in order to avoid a destroy since this function is used
2401 * in the domain session creation (kernel and ust) only. Same for UST
2404 if (session
->kernel_session
->consumer
) {
2405 consumer_destroy_output(session
->kernel_session
->consumer
);
2407 session
->kernel_session
->consumer
=
2408 consumer_copy_output(session
->consumer
);
2409 /* Ease our life a bit for the next part */
2410 consumer
= session
->kernel_session
->consumer
;
2411 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2413 case LTTNG_DOMAIN_UST
:
2414 DBG3("Copying tracing session consumer output in UST session");
2415 if (session
->ust_session
->consumer
) {
2416 consumer_destroy_output(session
->ust_session
->consumer
);
2418 session
->ust_session
->consumer
=
2419 consumer_copy_output(session
->consumer
);
2420 /* Ease our life a bit for the next part */
2421 consumer
= session
->ust_session
->consumer
;
2422 dir_name
= DEFAULT_UST_TRACE_DIR
;
2425 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2429 /* Append correct directory to subdir */
2430 strncat(consumer
->subdir
, dir_name
,
2431 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2432 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2441 * Create an UST session and add it to the session ust list.
2443 * Should *NOT* be called with RCU read-side lock held.
2445 static int create_ust_session(struct ltt_session
*session
,
2446 struct lttng_domain
*domain
)
2449 struct ltt_ust_session
*lus
= NULL
;
2453 assert(session
->consumer
);
2455 switch (domain
->type
) {
2456 case LTTNG_DOMAIN_UST
:
2459 ERR("Unknown UST domain on create session %d", domain
->type
);
2460 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2464 DBG("Creating UST session");
2466 lus
= trace_ust_create_session(session
->id
);
2468 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2472 lus
->uid
= session
->uid
;
2473 lus
->gid
= session
->gid
;
2474 lus
->output_traces
= session
->output_traces
;
2475 lus
->snapshot_mode
= session
->snapshot_mode
;
2476 lus
->live_timer_interval
= session
->live_timer
;
2477 session
->ust_session
= lus
;
2479 /* Copy session output to the newly created UST session */
2480 ret
= copy_session_consumer(domain
->type
, session
);
2481 if (ret
!= LTTNG_OK
) {
2489 session
->ust_session
= NULL
;
2494 * Create a kernel tracer session then create the default channel.
2496 static int create_kernel_session(struct ltt_session
*session
)
2500 DBG("Creating kernel session");
2502 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2504 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2508 /* Code flow safety */
2509 assert(session
->kernel_session
);
2511 /* Copy session output to the newly created Kernel session */
2512 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2513 if (ret
!= LTTNG_OK
) {
2517 /* Create directory(ies) on local filesystem. */
2518 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2519 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2520 ret
= run_as_mkdir_recursive(
2521 session
->kernel_session
->consumer
->dst
.trace_path
,
2522 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2524 if (ret
!= -EEXIST
) {
2525 ERR("Trace directory creation error");
2531 session
->kernel_session
->uid
= session
->uid
;
2532 session
->kernel_session
->gid
= session
->gid
;
2533 session
->kernel_session
->output_traces
= session
->output_traces
;
2534 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2539 trace_kernel_destroy_session(session
->kernel_session
);
2540 session
->kernel_session
= NULL
;
2545 * Count number of session permitted by uid/gid.
2547 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2550 struct ltt_session
*session
;
2552 DBG("Counting number of available session for UID %d GID %d",
2554 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2556 * Only list the sessions the user can control.
2558 if (!session_access_ok(session
, uid
, gid
)) {
2567 * Process the command requested by the lttng client within the command
2568 * context structure. This function make sure that the return structure (llm)
2569 * is set and ready for transmission before returning.
2571 * Return any error encountered or 0 for success.
2573 * "sock" is only used for special-case var. len data.
2575 * Should *NOT* be called with RCU read-side lock held.
2577 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2581 int need_tracing_session
= 1;
2584 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2588 switch (cmd_ctx
->lsm
->cmd_type
) {
2589 case LTTNG_CREATE_SESSION
:
2590 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2591 case LTTNG_CREATE_SESSION_LIVE
:
2592 case LTTNG_DESTROY_SESSION
:
2593 case LTTNG_LIST_SESSIONS
:
2594 case LTTNG_LIST_DOMAINS
:
2595 case LTTNG_START_TRACE
:
2596 case LTTNG_STOP_TRACE
:
2597 case LTTNG_DATA_PENDING
:
2598 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2599 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2600 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2601 case LTTNG_SNAPSHOT_RECORD
:
2608 if (opt_no_kernel
&& need_domain
2609 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2611 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2613 ret
= LTTNG_ERR_KERN_NA
;
2618 /* Deny register consumer if we already have a spawned consumer. */
2619 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2620 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2621 if (kconsumer_data
.pid
> 0) {
2622 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2623 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2626 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2630 * Check for command that don't needs to allocate a returned payload. We do
2631 * this here so we don't have to make the call for no payload at each
2634 switch(cmd_ctx
->lsm
->cmd_type
) {
2635 case LTTNG_LIST_SESSIONS
:
2636 case LTTNG_LIST_TRACEPOINTS
:
2637 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2638 case LTTNG_LIST_DOMAINS
:
2639 case LTTNG_LIST_CHANNELS
:
2640 case LTTNG_LIST_EVENTS
:
2643 /* Setup lttng message with no payload */
2644 ret
= setup_lttng_msg(cmd_ctx
, 0);
2646 /* This label does not try to unlock the session */
2647 goto init_setup_error
;
2651 /* Commands that DO NOT need a session. */
2652 switch (cmd_ctx
->lsm
->cmd_type
) {
2653 case LTTNG_CREATE_SESSION
:
2654 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2655 case LTTNG_CREATE_SESSION_LIVE
:
2656 case LTTNG_CALIBRATE
:
2657 case LTTNG_LIST_SESSIONS
:
2658 case LTTNG_LIST_TRACEPOINTS
:
2659 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2660 need_tracing_session
= 0;
2663 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2665 * We keep the session list lock across _all_ commands
2666 * for now, because the per-session lock does not
2667 * handle teardown properly.
2669 session_lock_list();
2670 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2671 if (cmd_ctx
->session
== NULL
) {
2672 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2675 /* Acquire lock for the session */
2676 session_lock(cmd_ctx
->session
);
2686 * Check domain type for specific "pre-action".
2688 switch (cmd_ctx
->lsm
->domain
.type
) {
2689 case LTTNG_DOMAIN_KERNEL
:
2691 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2695 /* Kernel tracer check */
2696 if (kernel_tracer_fd
== -1) {
2697 /* Basically, load kernel tracer modules */
2698 ret
= init_kernel_tracer();
2704 /* Consumer is in an ERROR state. Report back to client */
2705 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2706 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2710 /* Need a session for kernel command */
2711 if (need_tracing_session
) {
2712 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2713 ret
= create_kernel_session(cmd_ctx
->session
);
2715 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2720 /* Start the kernel consumer daemon */
2721 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2722 if (kconsumer_data
.pid
== 0 &&
2723 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2724 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2725 ret
= start_consumerd(&kconsumer_data
);
2727 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2730 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2732 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2736 * The consumer was just spawned so we need to add the socket to
2737 * the consumer output of the session if exist.
2739 ret
= consumer_create_socket(&kconsumer_data
,
2740 cmd_ctx
->session
->kernel_session
->consumer
);
2747 case LTTNG_DOMAIN_UST
:
2749 if (!ust_app_supported()) {
2750 ret
= LTTNG_ERR_NO_UST
;
2753 /* Consumer is in an ERROR state. Report back to client */
2754 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2755 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2759 if (need_tracing_session
) {
2760 /* Create UST session if none exist. */
2761 if (cmd_ctx
->session
->ust_session
== NULL
) {
2762 ret
= create_ust_session(cmd_ctx
->session
,
2763 &cmd_ctx
->lsm
->domain
);
2764 if (ret
!= LTTNG_OK
) {
2769 /* Start the UST consumer daemons */
2771 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2772 if (consumerd64_bin
[0] != '\0' &&
2773 ustconsumer64_data
.pid
== 0 &&
2774 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2775 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2776 ret
= start_consumerd(&ustconsumer64_data
);
2778 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2779 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2783 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2784 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2786 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2790 * Setup socket for consumer 64 bit. No need for atomic access
2791 * since it was set above and can ONLY be set in this thread.
2793 ret
= consumer_create_socket(&ustconsumer64_data
,
2794 cmd_ctx
->session
->ust_session
->consumer
);
2800 if (consumerd32_bin
[0] != '\0' &&
2801 ustconsumer32_data
.pid
== 0 &&
2802 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2803 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2804 ret
= start_consumerd(&ustconsumer32_data
);
2806 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2807 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2811 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2812 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2814 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2818 * Setup socket for consumer 64 bit. No need for atomic access
2819 * since it was set above and can ONLY be set in this thread.
2821 ret
= consumer_create_socket(&ustconsumer32_data
,
2822 cmd_ctx
->session
->ust_session
->consumer
);
2834 /* Validate consumer daemon state when start/stop trace command */
2835 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2836 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2837 switch (cmd_ctx
->lsm
->domain
.type
) {
2838 case LTTNG_DOMAIN_UST
:
2839 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2840 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2844 case LTTNG_DOMAIN_KERNEL
:
2845 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2846 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2854 * Check that the UID or GID match that of the tracing session.
2855 * The root user can interact with all sessions.
2857 if (need_tracing_session
) {
2858 if (!session_access_ok(cmd_ctx
->session
,
2859 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2860 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2861 ret
= LTTNG_ERR_EPERM
;
2867 * Send relayd information to consumer as soon as we have a domain and a
2870 if (cmd_ctx
->session
&& need_domain
) {
2872 * Setup relayd if not done yet. If the relayd information was already
2873 * sent to the consumer, this call will gracefully return.
2875 ret
= cmd_setup_relayd(cmd_ctx
->session
);
2876 if (ret
!= LTTNG_OK
) {
2881 /* Process by command type */
2882 switch (cmd_ctx
->lsm
->cmd_type
) {
2883 case LTTNG_ADD_CONTEXT
:
2885 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2886 cmd_ctx
->lsm
->u
.context
.channel_name
,
2887 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2890 case LTTNG_DISABLE_CHANNEL
:
2892 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2893 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2896 case LTTNG_DISABLE_EVENT
:
2898 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2899 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2900 cmd_ctx
->lsm
->u
.disable
.name
);
2903 case LTTNG_DISABLE_ALL_EVENT
:
2905 DBG("Disabling all events");
2907 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2908 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2911 case LTTNG_ENABLE_CHANNEL
:
2913 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2914 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2917 case LTTNG_ENABLE_EVENT
:
2919 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2920 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2921 &cmd_ctx
->lsm
->u
.enable
.event
, NULL
, kernel_poll_pipe
[1]);
2924 case LTTNG_ENABLE_ALL_EVENT
:
2926 DBG("Enabling all events");
2928 ret
= cmd_enable_event_all(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2929 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2930 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
2933 case LTTNG_LIST_TRACEPOINTS
:
2935 struct lttng_event
*events
;
2938 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2939 if (nb_events
< 0) {
2940 /* Return value is a negative lttng_error_code. */
2946 * Setup lttng message with payload size set to the event list size in
2947 * bytes and then copy list into the llm payload.
2949 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2955 /* Copy event list into message payload */
2956 memcpy(cmd_ctx
->llm
->payload
, events
,
2957 sizeof(struct lttng_event
) * nb_events
);
2964 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2966 struct lttng_event_field
*fields
;
2969 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2971 if (nb_fields
< 0) {
2972 /* Return value is a negative lttng_error_code. */
2978 * Setup lttng message with payload size set to the event list size in
2979 * bytes and then copy list into the llm payload.
2981 ret
= setup_lttng_msg(cmd_ctx
,
2982 sizeof(struct lttng_event_field
) * nb_fields
);
2988 /* Copy event list into message payload */
2989 memcpy(cmd_ctx
->llm
->payload
, fields
,
2990 sizeof(struct lttng_event_field
) * nb_fields
);
2997 case LTTNG_SET_CONSUMER_URI
:
3000 struct lttng_uri
*uris
;
3002 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3003 len
= nb_uri
* sizeof(struct lttng_uri
);
3006 ret
= LTTNG_ERR_INVALID
;
3010 uris
= zmalloc(len
);
3012 ret
= LTTNG_ERR_FATAL
;
3016 /* Receive variable len data */
3017 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3018 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3020 DBG("No URIs received from client... continuing");
3022 ret
= LTTNG_ERR_SESSION_FAIL
;
3027 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3029 if (ret
!= LTTNG_OK
) {
3035 * XXX: 0 means that this URI should be applied on the session. Should
3036 * be a DOMAIN enuam.
3038 if (cmd_ctx
->lsm
->domain
.type
== 0) {
3039 /* Add the URI for the UST session if a consumer is present. */
3040 if (cmd_ctx
->session
->ust_session
&&
3041 cmd_ctx
->session
->ust_session
->consumer
) {
3042 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
3044 } else if (cmd_ctx
->session
->kernel_session
&&
3045 cmd_ctx
->session
->kernel_session
->consumer
) {
3046 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
3047 cmd_ctx
->session
, nb_uri
, uris
);
3055 case LTTNG_START_TRACE
:
3057 ret
= cmd_start_trace(cmd_ctx
->session
);
3060 case LTTNG_STOP_TRACE
:
3062 ret
= cmd_stop_trace(cmd_ctx
->session
);
3065 case LTTNG_CREATE_SESSION
:
3068 struct lttng_uri
*uris
= NULL
;
3070 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3071 len
= nb_uri
* sizeof(struct lttng_uri
);
3074 uris
= zmalloc(len
);
3076 ret
= LTTNG_ERR_FATAL
;
3080 /* Receive variable len data */
3081 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3082 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3084 DBG("No URIs received from client... continuing");
3086 ret
= LTTNG_ERR_SESSION_FAIL
;
3091 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3092 DBG("Creating session with ONE network URI is a bad call");
3093 ret
= LTTNG_ERR_SESSION_FAIL
;
3099 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3100 &cmd_ctx
->creds
, 0);
3106 case LTTNG_DESTROY_SESSION
:
3108 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3110 /* Set session to NULL so we do not unlock it after free. */
3111 cmd_ctx
->session
= NULL
;
3114 case LTTNG_LIST_DOMAINS
:
3117 struct lttng_domain
*domains
;
3119 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3121 /* Return value is a negative lttng_error_code. */
3126 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3132 /* Copy event list into message payload */
3133 memcpy(cmd_ctx
->llm
->payload
, domains
,
3134 nb_dom
* sizeof(struct lttng_domain
));
3141 case LTTNG_LIST_CHANNELS
:
3144 struct lttng_channel
*channels
;
3146 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3147 cmd_ctx
->session
, &channels
);
3149 /* Return value is a negative lttng_error_code. */
3154 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3160 /* Copy event list into message payload */
3161 memcpy(cmd_ctx
->llm
->payload
, channels
,
3162 nb_chan
* sizeof(struct lttng_channel
));
3169 case LTTNG_LIST_EVENTS
:
3172 struct lttng_event
*events
= NULL
;
3174 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3175 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3177 /* Return value is a negative lttng_error_code. */
3182 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3188 /* Copy event list into message payload */
3189 memcpy(cmd_ctx
->llm
->payload
, events
,
3190 nb_event
* sizeof(struct lttng_event
));
3197 case LTTNG_LIST_SESSIONS
:
3199 unsigned int nr_sessions
;
3201 session_lock_list();
3202 nr_sessions
= lttng_sessions_count(
3203 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3204 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3206 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3208 session_unlock_list();
3212 /* Filled the session array */
3213 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3214 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3215 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3217 session_unlock_list();
3222 case LTTNG_CALIBRATE
:
3224 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3225 &cmd_ctx
->lsm
->u
.calibrate
);
3228 case LTTNG_REGISTER_CONSUMER
:
3230 struct consumer_data
*cdata
;
3232 switch (cmd_ctx
->lsm
->domain
.type
) {
3233 case LTTNG_DOMAIN_KERNEL
:
3234 cdata
= &kconsumer_data
;
3237 ret
= LTTNG_ERR_UND
;
3241 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3242 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3245 case LTTNG_ENABLE_EVENT_WITH_FILTER
:
3247 struct lttng_filter_bytecode
*bytecode
;
3249 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3250 ret
= LTTNG_ERR_FILTER_INVAL
;
3253 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
== 0) {
3254 ret
= LTTNG_ERR_FILTER_INVAL
;
3257 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3259 ret
= LTTNG_ERR_FILTER_NOMEM
;
3262 /* Receive var. len. data */
3263 DBG("Receiving var len data from client ...");
3264 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
3265 cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
3267 DBG("Nothing recv() from client var len data... continuing");
3269 ret
= LTTNG_ERR_FILTER_INVAL
;
3273 if (bytecode
->len
+ sizeof(*bytecode
)
3274 != cmd_ctx
->lsm
->u
.enable
.bytecode_len
) {
3276 ret
= LTTNG_ERR_FILTER_INVAL
;
3280 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3281 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3282 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, kernel_poll_pipe
[1]);
3285 case LTTNG_DATA_PENDING
:
3287 ret
= cmd_data_pending(cmd_ctx
->session
);
3290 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3292 struct lttcomm_lttng_output_id reply
;
3294 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3295 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3296 if (ret
!= LTTNG_OK
) {
3300 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3305 /* Copy output list into message payload */
3306 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3310 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3312 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3313 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3316 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3319 struct lttng_snapshot_output
*outputs
= NULL
;
3321 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3322 if (nb_output
< 0) {
3327 ret
= setup_lttng_msg(cmd_ctx
,
3328 nb_output
* sizeof(struct lttng_snapshot_output
));
3335 /* Copy output list into message payload */
3336 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3337 nb_output
* sizeof(struct lttng_snapshot_output
));
3344 case LTTNG_SNAPSHOT_RECORD
:
3346 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3347 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3348 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3351 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3354 struct lttng_uri
*uris
= NULL
;
3356 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3357 len
= nb_uri
* sizeof(struct lttng_uri
);
3360 uris
= zmalloc(len
);
3362 ret
= LTTNG_ERR_FATAL
;
3366 /* Receive variable len data */
3367 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3368 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3370 DBG("No URIs received from client... continuing");
3372 ret
= LTTNG_ERR_SESSION_FAIL
;
3377 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3378 DBG("Creating session with ONE network URI is a bad call");
3379 ret
= LTTNG_ERR_SESSION_FAIL
;
3385 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
3386 nb_uri
, &cmd_ctx
->creds
);
3390 case LTTNG_CREATE_SESSION_LIVE
:
3393 struct lttng_uri
*uris
= NULL
;
3395 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3396 len
= nb_uri
* sizeof(struct lttng_uri
);
3399 uris
= zmalloc(len
);
3401 ret
= LTTNG_ERR_FATAL
;
3405 /* Receive variable len data */
3406 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3407 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3409 DBG("No URIs received from client... continuing");
3411 ret
= LTTNG_ERR_SESSION_FAIL
;
3416 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3417 DBG("Creating session with ONE network URI is a bad call");
3418 ret
= LTTNG_ERR_SESSION_FAIL
;
3424 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
3425 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
3430 ret
= LTTNG_ERR_UND
;
3435 if (cmd_ctx
->llm
== NULL
) {
3436 DBG("Missing llm structure. Allocating one.");
3437 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3441 /* Set return code */
3442 cmd_ctx
->llm
->ret_code
= ret
;
3444 if (cmd_ctx
->session
) {
3445 session_unlock(cmd_ctx
->session
);
3447 if (need_tracing_session
) {
3448 session_unlock_list();
3455 * Thread managing health check socket.
3457 static void *thread_manage_health(void *data
)
3459 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3460 uint32_t revents
, nb_fd
;
3461 struct lttng_poll_event events
;
3462 struct health_comm_msg msg
;
3463 struct health_comm_reply reply
;
3465 DBG("[thread] Manage health check started");
3467 rcu_register_thread();
3469 /* We might hit an error path before this is created. */
3470 lttng_poll_init(&events
);
3472 /* Create unix socket */
3473 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3475 ERR("Unable to create health check Unix socket");
3481 /* lttng health client socket path permissions */
3482 ret
= chown(health_unix_sock_path
, 0,
3483 utils_get_group_id(tracing_group_name
));
3485 ERR("Unable to set group on %s", health_unix_sock_path
);
3491 ret
= chmod(health_unix_sock_path
,
3492 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3494 ERR("Unable to set permissions on %s", health_unix_sock_path
);
3502 * Set the CLOEXEC flag. Return code is useless because either way, the
3505 (void) utils_set_fd_cloexec(sock
);
3507 ret
= lttcomm_listen_unix_sock(sock
);
3513 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3514 * more will be added to this poll set.
3516 ret
= sessiond_set_thread_pollset(&events
, 2);
3521 /* Add the application registration socket */
3522 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3528 DBG("Health check ready");
3530 /* Inifinite blocking call, waiting for transmission */
3532 ret
= lttng_poll_wait(&events
, -1);
3535 * Restart interrupted system call.
3537 if (errno
== EINTR
) {
3545 for (i
= 0; i
< nb_fd
; i
++) {
3546 /* Fetch once the poll data */
3547 revents
= LTTNG_POLL_GETEV(&events
, i
);
3548 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3550 /* Thread quit pipe has been closed. Killing thread. */
3551 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3557 /* Event on the registration socket */
3558 if (pollfd
== sock
) {
3559 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3560 ERR("Health socket poll error");
3566 new_sock
= lttcomm_accept_unix_sock(sock
);
3572 * Set the CLOEXEC flag. Return code is useless because either way, the
3575 (void) utils_set_fd_cloexec(new_sock
);
3577 DBG("Receiving data from client for health...");
3578 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3580 DBG("Nothing recv() from client... continuing");
3581 ret
= close(new_sock
);
3589 rcu_thread_online();
3592 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
3594 * health_check_state returns 0 if health is
3597 if (!health_check_state(health_sessiond
, i
)) {
3598 reply
.ret_code
|= 1ULL << i
;
3602 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
3604 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3606 ERR("Failed to send health data back to client");
3609 /* End of transmission */
3610 ret
= close(new_sock
);
3620 ERR("Health error occurred in %s", __func__
);
3622 DBG("Health check thread dying");
3623 unlink(health_unix_sock_path
);
3631 lttng_poll_clean(&events
);
3633 rcu_unregister_thread();
3638 * This thread manage all clients request using the unix client socket for
3641 static void *thread_manage_clients(void *data
)
3643 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3645 uint32_t revents
, nb_fd
;
3646 struct command_ctx
*cmd_ctx
= NULL
;
3647 struct lttng_poll_event events
;
3649 DBG("[thread] Manage client started");
3651 rcu_register_thread();
3653 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
3655 if (testpoint(thread_manage_clients
)) {
3656 goto error_testpoint
;
3659 health_code_update();
3661 ret
= lttcomm_listen_unix_sock(client_sock
);
3667 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3668 * more will be added to this poll set.
3670 ret
= sessiond_set_thread_pollset(&events
, 2);
3672 goto error_create_poll
;
3675 /* Add the application registration socket */
3676 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3682 * Notify parent pid that we are ready to accept command for client side.
3684 if (opt_sig_parent
) {
3685 kill(ppid
, SIGUSR1
);
3688 if (testpoint(thread_manage_clients_before_loop
)) {
3692 health_code_update();
3695 DBG("Accepting client command ...");
3697 /* Inifinite blocking call, waiting for transmission */
3699 health_poll_entry();
3700 ret
= lttng_poll_wait(&events
, -1);
3704 * Restart interrupted system call.
3706 if (errno
== EINTR
) {
3714 for (i
= 0; i
< nb_fd
; i
++) {
3715 /* Fetch once the poll data */
3716 revents
= LTTNG_POLL_GETEV(&events
, i
);
3717 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3719 health_code_update();
3721 /* Thread quit pipe has been closed. Killing thread. */
3722 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3728 /* Event on the registration socket */
3729 if (pollfd
== client_sock
) {
3730 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3731 ERR("Client socket poll error");
3737 DBG("Wait for client response");
3739 health_code_update();
3741 sock
= lttcomm_accept_unix_sock(client_sock
);
3747 * Set the CLOEXEC flag. Return code is useless because either way, the
3750 (void) utils_set_fd_cloexec(sock
);
3752 /* Set socket option for credentials retrieval */
3753 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3758 /* Allocate context command to process the client request */
3759 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3760 if (cmd_ctx
== NULL
) {
3761 PERROR("zmalloc cmd_ctx");
3765 /* Allocate data buffer for reception */
3766 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3767 if (cmd_ctx
->lsm
== NULL
) {
3768 PERROR("zmalloc cmd_ctx->lsm");
3772 cmd_ctx
->llm
= NULL
;
3773 cmd_ctx
->session
= NULL
;
3775 health_code_update();
3778 * Data is received from the lttng client. The struct
3779 * lttcomm_session_msg (lsm) contains the command and data request of
3782 DBG("Receiving data from client ...");
3783 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3784 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3786 DBG("Nothing recv() from client... continuing");
3792 clean_command_ctx(&cmd_ctx
);
3796 health_code_update();
3798 // TODO: Validate cmd_ctx including sanity check for
3799 // security purpose.
3801 rcu_thread_online();
3803 * This function dispatch the work to the kernel or userspace tracer
3804 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3805 * informations for the client. The command context struct contains
3806 * everything this function may needs.
3808 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3809 rcu_thread_offline();
3817 * TODO: Inform client somehow of the fatal error. At
3818 * this point, ret < 0 means that a zmalloc failed
3819 * (ENOMEM). Error detected but still accept
3820 * command, unless a socket error has been
3823 clean_command_ctx(&cmd_ctx
);
3827 health_code_update();
3829 DBG("Sending response (size: %d, retcode: %s)",
3830 cmd_ctx
->lttng_msg_size
,
3831 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3832 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3834 ERR("Failed to send data back to client");
3837 /* End of transmission */
3844 clean_command_ctx(&cmd_ctx
);
3846 health_code_update();
3858 lttng_poll_clean(&events
);
3859 clean_command_ctx(&cmd_ctx
);
3864 unlink(client_unix_sock_path
);
3865 if (client_sock
>= 0) {
3866 ret
= close(client_sock
);
3874 ERR("Health error occurred in %s", __func__
);
3877 health_unregister(health_sessiond
);
3879 DBG("Client thread dying");
3881 rcu_unregister_thread();
3887 * usage function on stderr
3889 static void usage(void)
3891 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3892 fprintf(stderr
, " -h, --help Display this usage.\n");
3893 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3894 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3895 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3896 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3897 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3898 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3899 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3900 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3901 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3902 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3903 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3904 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3905 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3906 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3907 fprintf(stderr
, " -V, --version Show version number.\n");
3908 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3909 fprintf(stderr
, " -q, --quiet No output at all.\n");
3910 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3911 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3912 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3913 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3917 * daemon argument parsing
3919 static int parse_args(int argc
, char **argv
)
3923 static struct option long_options
[] = {
3924 { "client-sock", 1, 0, 'c' },
3925 { "apps-sock", 1, 0, 'a' },
3926 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3927 { "kconsumerd-err-sock", 1, 0, 'E' },
3928 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3929 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3930 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3931 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3932 { "consumerd32-path", 1, 0, 'u' },
3933 { "consumerd32-libdir", 1, 0, 'U' },
3934 { "consumerd64-path", 1, 0, 't' },
3935 { "consumerd64-libdir", 1, 0, 'T' },
3936 { "daemonize", 0, 0, 'd' },
3937 { "sig-parent", 0, 0, 'S' },
3938 { "help", 0, 0, 'h' },
3939 { "group", 1, 0, 'g' },
3940 { "version", 0, 0, 'V' },
3941 { "quiet", 0, 0, 'q' },
3942 { "verbose", 0, 0, 'v' },
3943 { "verbose-consumer", 0, 0, 'Z' },
3944 { "no-kernel", 0, 0, 'N' },
3945 { "pidfile", 1, 0, 'p' },
3950 int option_index
= 0;
3951 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3952 long_options
, &option_index
);
3959 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3961 fprintf(stderr
, " with arg %s\n", optarg
);
3965 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3968 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3974 tracing_group_name
= optarg
;
3980 fprintf(stdout
, "%s\n", VERSION
);
3986 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3989 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3992 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3995 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3998 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4001 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4007 lttng_opt_quiet
= 1;
4010 /* Verbose level can increase using multiple -v */
4011 lttng_opt_verbose
+= 1;
4014 opt_verbose_consumer
+= 1;
4017 consumerd32_bin
= optarg
;
4020 consumerd32_libdir
= optarg
;
4023 consumerd64_bin
= optarg
;
4026 consumerd64_libdir
= optarg
;
4029 opt_pidfile
= optarg
;
4032 /* Unknown option or other error.
4033 * Error is printed by getopt, just return */
4042 * Creates the two needed socket by the daemon.
4043 * apps_sock - The communication socket for all UST apps.
4044 * client_sock - The communication of the cli tool (lttng).
4046 static int init_daemon_socket(void)
4051 old_umask
= umask(0);
4053 /* Create client tool unix socket */
4054 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4055 if (client_sock
< 0) {
4056 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4061 /* Set the cloexec flag */
4062 ret
= utils_set_fd_cloexec(client_sock
);
4064 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4065 "Continuing but note that the consumer daemon will have a "
4066 "reference to this socket on exec()", client_sock
);
4069 /* File permission MUST be 660 */
4070 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4072 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4077 /* Create the application unix socket */
4078 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4079 if (apps_sock
< 0) {
4080 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4085 /* Set the cloexec flag */
4086 ret
= utils_set_fd_cloexec(apps_sock
);
4088 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4089 "Continuing but note that the consumer daemon will have a "
4090 "reference to this socket on exec()", apps_sock
);
4093 /* File permission MUST be 666 */
4094 ret
= chmod(apps_unix_sock_path
,
4095 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4097 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4102 DBG3("Session daemon client socket %d and application socket %d created",
4103 client_sock
, apps_sock
);
4111 * Check if the global socket is available, and if a daemon is answering at the
4112 * other side. If yes, error is returned.
4114 static int check_existing_daemon(void)
4116 /* Is there anybody out there ? */
4117 if (lttng_session_daemon_alive()) {
4125 * Set the tracing group gid onto the client socket.
4127 * Race window between mkdir and chown is OK because we are going from more
4128 * permissive (root.root) to less permissive (root.tracing).
4130 static int set_permissions(char *rundir
)
4135 gid
= utils_get_group_id(tracing_group_name
);
4137 /* Set lttng run dir */
4138 ret
= chown(rundir
, 0, gid
);
4140 ERR("Unable to set group on %s", rundir
);
4145 * Ensure all applications and tracing group can search the run
4146 * dir. Allow everyone to read the directory, since it does not
4147 * buy us anything to hide its content.
4149 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
4151 ERR("Unable to set permissions on %s", rundir
);
4155 /* lttng client socket path */
4156 ret
= chown(client_unix_sock_path
, 0, gid
);
4158 ERR("Unable to set group on %s", client_unix_sock_path
);
4162 /* kconsumer error socket path */
4163 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
4165 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4169 /* 64-bit ustconsumer error socket path */
4170 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
4172 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4176 /* 32-bit ustconsumer compat32 error socket path */
4177 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
4179 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4183 DBG("All permissions are set");
4189 * Create the lttng run directory needed for all global sockets and pipe.
4191 static int create_lttng_rundir(const char *rundir
)
4195 DBG3("Creating LTTng run directory: %s", rundir
);
4197 ret
= mkdir(rundir
, S_IRWXU
);
4199 if (errno
!= EEXIST
) {
4200 ERR("Unable to create %s", rundir
);
4212 * Setup sockets and directory needed by the kconsumerd communication with the
4215 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4219 char path
[PATH_MAX
];
4221 switch (consumer_data
->type
) {
4222 case LTTNG_CONSUMER_KERNEL
:
4223 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4225 case LTTNG_CONSUMER64_UST
:
4226 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4228 case LTTNG_CONSUMER32_UST
:
4229 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4232 ERR("Consumer type unknown");
4237 DBG2("Creating consumer directory: %s", path
);
4239 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
4241 if (errno
!= EEXIST
) {
4243 ERR("Failed to create %s", path
);
4249 ret
= chown(path
, 0, utils_get_group_id(tracing_group_name
));
4251 ERR("Unable to set group on %s", path
);
4257 /* Create the kconsumerd error unix socket */
4258 consumer_data
->err_sock
=
4259 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4260 if (consumer_data
->err_sock
< 0) {
4261 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4267 * Set the CLOEXEC flag. Return code is useless because either way, the
4270 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
4272 PERROR("utils_set_fd_cloexec");
4273 /* continue anyway */
4276 /* File permission MUST be 660 */
4277 ret
= chmod(consumer_data
->err_unix_sock_path
,
4278 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4280 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4290 * Signal handler for the daemon
4292 * Simply stop all worker threads, leaving main() return gracefully after
4293 * joining all threads and calling cleanup().
4295 static void sighandler(int sig
)
4299 DBG("SIGPIPE caught");
4302 DBG("SIGINT caught");
4306 DBG("SIGTERM caught");
4315 * Setup signal handler for :
4316 * SIGINT, SIGTERM, SIGPIPE
4318 static int set_signal_handler(void)
4321 struct sigaction sa
;
4324 if ((ret
= sigemptyset(&sigset
)) < 0) {
4325 PERROR("sigemptyset");
4329 sa
.sa_handler
= sighandler
;
4330 sa
.sa_mask
= sigset
;
4332 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4333 PERROR("sigaction");
4337 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4338 PERROR("sigaction");
4342 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4343 PERROR("sigaction");
4347 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4353 * Set open files limit to unlimited. This daemon can open a large number of
4354 * file descriptors in order to consumer multiple kernel traces.
4356 static void set_ulimit(void)
4361 /* The kernel does not allowed an infinite limit for open files */
4362 lim
.rlim_cur
= 65535;
4363 lim
.rlim_max
= 65535;
4365 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4367 PERROR("failed to set open files limit");
4372 * Write pidfile using the rundir and opt_pidfile.
4374 static void write_pidfile(void)
4377 char pidfile_path
[PATH_MAX
];
4382 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
4384 /* Build pidfile path from rundir and opt_pidfile. */
4385 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
4386 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
4388 PERROR("snprintf pidfile path");
4394 * Create pid file in rundir. Return value is of no importance. The
4395 * execution will continue even though we are not able to write the file.
4397 (void) utils_create_pid_file(getpid(), pidfile_path
);
4406 int main(int argc
, char **argv
)
4410 const char *home_path
, *env_app_timeout
;
4412 init_kernel_workarounds();
4414 rcu_register_thread();
4416 setup_consumerd_path();
4418 page_size
= sysconf(_SC_PAGESIZE
);
4419 if (page_size
< 0) {
4420 PERROR("sysconf _SC_PAGESIZE");
4421 page_size
= LONG_MAX
;
4422 WARN("Fallback page size to %ld", page_size
);
4425 /* Parse arguments */
4427 if ((ret
= parse_args(argc
, argv
)) < 0) {
4437 * child: setsid, close FD 0, 1, 2, chdir /
4438 * parent: exit (if fork is successful)
4446 * We are in the child. Make sure all other file
4447 * descriptors are closed, in case we are called with
4448 * more opened file descriptors than the standard ones.
4450 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
4455 /* Create thread quit pipe */
4456 if ((ret
= init_thread_quit_pipe()) < 0) {
4460 /* Check if daemon is UID = 0 */
4461 is_root
= !getuid();
4464 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4466 /* Create global run dir with root access */
4467 ret
= create_lttng_rundir(rundir
);
4472 if (strlen(apps_unix_sock_path
) == 0) {
4473 snprintf(apps_unix_sock_path
, PATH_MAX
,
4474 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4477 if (strlen(client_unix_sock_path
) == 0) {
4478 snprintf(client_unix_sock_path
, PATH_MAX
,
4479 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4482 /* Set global SHM for ust */
4483 if (strlen(wait_shm_path
) == 0) {
4484 snprintf(wait_shm_path
, PATH_MAX
,
4485 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4488 if (strlen(health_unix_sock_path
) == 0) {
4489 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4490 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
4493 /* Setup kernel consumerd path */
4494 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4495 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4496 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4497 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4499 DBG2("Kernel consumer err path: %s",
4500 kconsumer_data
.err_unix_sock_path
);
4501 DBG2("Kernel consumer cmd path: %s",
4502 kconsumer_data
.cmd_unix_sock_path
);
4504 home_path
= utils_get_home_dir();
4505 if (home_path
== NULL
) {
4506 /* TODO: Add --socket PATH option */
4507 ERR("Can't get HOME directory for sockets creation.");
4513 * Create rundir from home path. This will create something like
4516 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4522 ret
= create_lttng_rundir(rundir
);
4527 if (strlen(apps_unix_sock_path
) == 0) {
4528 snprintf(apps_unix_sock_path
, PATH_MAX
,
4529 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4532 /* Set the cli tool unix socket path */
4533 if (strlen(client_unix_sock_path
) == 0) {
4534 snprintf(client_unix_sock_path
, PATH_MAX
,
4535 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4538 /* Set global SHM for ust */
4539 if (strlen(wait_shm_path
) == 0) {
4540 snprintf(wait_shm_path
, PATH_MAX
,
4541 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
4544 /* Set health check Unix path */
4545 if (strlen(health_unix_sock_path
) == 0) {
4546 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4547 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4551 /* Set consumer initial state */
4552 kernel_consumerd_state
= CONSUMER_STOPPED
;
4553 ust_consumerd_state
= CONSUMER_STOPPED
;
4555 DBG("Client socket path %s", client_unix_sock_path
);
4556 DBG("Application socket path %s", apps_unix_sock_path
);
4557 DBG("Application wait path %s", wait_shm_path
);
4558 DBG("LTTng run directory path: %s", rundir
);
4560 /* 32 bits consumerd path setup */
4561 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4562 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4563 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4564 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4566 DBG2("UST consumer 32 bits err path: %s",
4567 ustconsumer32_data
.err_unix_sock_path
);
4568 DBG2("UST consumer 32 bits cmd path: %s",
4569 ustconsumer32_data
.cmd_unix_sock_path
);
4571 /* 64 bits consumerd path setup */
4572 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4573 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4574 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4575 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4577 DBG2("UST consumer 64 bits err path: %s",
4578 ustconsumer64_data
.err_unix_sock_path
);
4579 DBG2("UST consumer 64 bits cmd path: %s",
4580 ustconsumer64_data
.cmd_unix_sock_path
);
4583 * See if daemon already exist.
4585 if ((ret
= check_existing_daemon()) < 0) {
4586 ERR("Already running daemon.\n");
4588 * We do not goto exit because we must not cleanup()
4589 * because a daemon is already running.
4595 * Init UST app hash table. Alloc hash table before this point since
4596 * cleanup() can get called after that point.
4600 /* After this point, we can safely call cleanup() with "goto exit" */
4603 * These actions must be executed as root. We do that *after* setting up
4604 * the sockets path because we MUST make the check for another daemon using
4605 * those paths *before* trying to set the kernel consumer sockets and init
4609 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4614 /* Setup kernel tracer */
4615 if (!opt_no_kernel
) {
4616 init_kernel_tracer();
4619 /* Set ulimit for open files */
4622 /* init lttng_fd tracking must be done after set_ulimit. */
4625 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4630 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4635 if ((ret
= set_signal_handler()) < 0) {
4639 /* Setup the needed unix socket */
4640 if ((ret
= init_daemon_socket()) < 0) {
4644 /* Set credentials to socket */
4645 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4649 /* Get parent pid if -S, --sig-parent is specified. */
4650 if (opt_sig_parent
) {
4654 /* Setup the kernel pipe for waking up the kernel thread */
4655 if (is_root
&& !opt_no_kernel
) {
4656 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4661 /* Setup the thread ht_cleanup communication pipe. */
4662 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
4666 /* Setup the thread apps communication pipe. */
4667 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4671 /* Setup the thread apps notify communication pipe. */
4672 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
4676 /* Initialize global buffer per UID and PID registry. */
4677 buffer_reg_init_uid_registry();
4678 buffer_reg_init_pid_registry();
4680 /* Init UST command queue. */
4681 cds_wfq_init(&ust_cmd_queue
.queue
);
4684 * Get session list pointer. This pointer MUST NOT be free(). This list is
4685 * statically declared in session.c
4687 session_list_ptr
= session_get_list();
4689 /* Set up max poll set size */
4690 lttng_poll_set_max_size();
4694 /* Check for the application socket timeout env variable. */
4695 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4696 if (env_app_timeout
) {
4697 app_socket_timeout
= atoi(env_app_timeout
);
4699 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4704 /* Initialize communication library */
4706 /* This is to get the TCP timeout value. */
4707 lttcomm_inet_init();
4710 * Initialize the health check subsystem. This call should set the
4711 * appropriate time values.
4713 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
4714 if (!health_sessiond
) {
4715 PERROR("health_app_create error");
4716 goto exit_health_sessiond_cleanup
;
4719 /* Create thread to manage the client socket */
4720 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
4721 thread_ht_cleanup
, (void *) NULL
);
4723 PERROR("pthread_create ht_cleanup");
4724 goto exit_ht_cleanup
;
4727 /* Create thread to manage the client socket */
4728 ret
= pthread_create(&health_thread
, NULL
,
4729 thread_manage_health
, (void *) NULL
);
4731 PERROR("pthread_create health");
4735 /* Create thread to manage the client socket */
4736 ret
= pthread_create(&client_thread
, NULL
,
4737 thread_manage_clients
, (void *) NULL
);
4739 PERROR("pthread_create clients");
4743 /* Create thread to dispatch registration */
4744 ret
= pthread_create(&dispatch_thread
, NULL
,
4745 thread_dispatch_ust_registration
, (void *) NULL
);
4747 PERROR("pthread_create dispatch");
4751 /* Create thread to manage application registration. */
4752 ret
= pthread_create(®_apps_thread
, NULL
,
4753 thread_registration_apps
, (void *) NULL
);
4755 PERROR("pthread_create registration");
4759 /* Create thread to manage application socket */
4760 ret
= pthread_create(&apps_thread
, NULL
,
4761 thread_manage_apps
, (void *) NULL
);
4763 PERROR("pthread_create apps");
4767 /* Create thread to manage application notify socket */
4768 ret
= pthread_create(&apps_notify_thread
, NULL
,
4769 ust_thread_manage_notify
, (void *) NULL
);
4771 PERROR("pthread_create apps");
4772 goto exit_apps_notify
;
4775 /* Don't start this thread if kernel tracing is not requested nor root */
4776 if (is_root
&& !opt_no_kernel
) {
4777 /* Create kernel thread to manage kernel event */
4778 ret
= pthread_create(&kernel_thread
, NULL
,
4779 thread_manage_kernel
, (void *) NULL
);
4781 PERROR("pthread_create kernel");
4785 ret
= pthread_join(kernel_thread
, &status
);
4787 PERROR("pthread_join");
4788 goto error
; /* join error, exit without cleanup */
4793 ret
= pthread_join(apps_notify_thread
, &status
);
4795 PERROR("pthread_join apps notify");
4796 goto error
; /* join error, exit without cleanup */
4800 ret
= pthread_join(apps_thread
, &status
);
4802 PERROR("pthread_join apps");
4803 goto error
; /* join error, exit without cleanup */
4808 ret
= pthread_join(reg_apps_thread
, &status
);
4810 PERROR("pthread_join");
4811 goto error
; /* join error, exit without cleanup */
4815 ret
= pthread_join(dispatch_thread
, &status
);
4817 PERROR("pthread_join");
4818 goto error
; /* join error, exit without cleanup */
4822 ret
= pthread_join(client_thread
, &status
);
4824 PERROR("pthread_join");
4825 goto error
; /* join error, exit without cleanup */
4828 ret
= join_consumer_thread(&kconsumer_data
);
4830 PERROR("join_consumer");
4831 goto error
; /* join error, exit without cleanup */
4834 ret
= join_consumer_thread(&ustconsumer32_data
);
4836 PERROR("join_consumer ust32");
4837 goto error
; /* join error, exit without cleanup */
4840 ret
= join_consumer_thread(&ustconsumer64_data
);
4842 PERROR("join_consumer ust64");
4843 goto error
; /* join error, exit without cleanup */
4847 ret
= pthread_join(health_thread
, &status
);
4849 PERROR("pthread_join health thread");
4850 goto error
; /* join error, exit without cleanup */
4854 ret
= pthread_join(ht_cleanup_thread
, &status
);
4856 PERROR("pthread_join ht cleanup thread");
4857 goto error
; /* join error, exit without cleanup */
4860 health_app_destroy(health_sessiond
);
4861 exit_health_sessiond_cleanup
:
4864 * cleanup() is called when no other thread is running.
4866 rcu_thread_online();
4868 rcu_thread_offline();
4869 rcu_unregister_thread();