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.
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/uatomic.h>
41 #include <common/common.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/futex.h>
46 #include <common/relayd/relayd.h>
47 #include <common/utils.h>
48 #include <common/daemonize.h>
50 #include "lttng-sessiond.h"
51 #include "buffer-registry.h"
58 #include "kernel-consumer.h"
62 #include "ust-consumer.h"
65 #include "health-sessiond.h"
66 #include "testpoint.h"
67 #include "ust-thread.h"
68 #include "jul-thread.h"
70 #define CONSUMERD_FILE "lttng-consumerd"
73 static const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
74 static const char *opt_pidfile
;
75 static int opt_sig_parent
;
76 static int opt_verbose_consumer
;
77 static int opt_daemon
;
78 static int opt_no_kernel
;
79 static int is_root
; /* Set to 1 if the daemon is running as root */
80 static pid_t ppid
; /* Parent PID for --sig-parent option */
81 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
84 /* Set to 1 when a SIGUSR1 signal is received. */
85 static int recv_child_signal
;
88 * Consumer daemon specific control data. Every value not initialized here is
89 * set to 0 by the static definition.
91 static struct consumer_data kconsumer_data
= {
92 .type
= LTTNG_CONSUMER_KERNEL
,
93 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
94 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
97 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
98 .lock
= PTHREAD_MUTEX_INITIALIZER
,
99 .cond
= PTHREAD_COND_INITIALIZER
,
100 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
102 static struct consumer_data ustconsumer64_data
= {
103 .type
= LTTNG_CONSUMER64_UST
,
104 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
105 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
108 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
109 .lock
= PTHREAD_MUTEX_INITIALIZER
,
110 .cond
= PTHREAD_COND_INITIALIZER
,
111 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
113 static struct consumer_data ustconsumer32_data
= {
114 .type
= LTTNG_CONSUMER32_UST
,
115 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
116 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
119 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
120 .lock
= PTHREAD_MUTEX_INITIALIZER
,
121 .cond
= PTHREAD_COND_INITIALIZER
,
122 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
125 /* Shared between threads */
126 static int dispatch_thread_exit
;
128 /* Global application Unix socket path */
129 static char apps_unix_sock_path
[PATH_MAX
];
130 /* Global client Unix socket path */
131 static char client_unix_sock_path
[PATH_MAX
];
132 /* global wait shm path for UST */
133 static char wait_shm_path
[PATH_MAX
];
134 /* Global health check unix path */
135 static char health_unix_sock_path
[PATH_MAX
];
137 /* Sockets and FDs */
138 static int client_sock
= -1;
139 static int apps_sock
= -1;
140 int kernel_tracer_fd
= -1;
141 static int kernel_poll_pipe
[2] = { -1, -1 };
144 * Quit pipe for all threads. This permits a single cancellation point
145 * for all threads when receiving an event on the pipe.
147 static int thread_quit_pipe
[2] = { -1, -1 };
150 * This pipe is used to inform the thread managing application communication
151 * that a command is queued and ready to be processed.
153 static int apps_cmd_pipe
[2] = { -1, -1 };
155 int apps_cmd_notify_pipe
[2] = { -1, -1 };
157 /* Pthread, Mutexes and Semaphores */
158 static pthread_t apps_thread
;
159 static pthread_t apps_notify_thread
;
160 static pthread_t reg_apps_thread
;
161 static pthread_t client_thread
;
162 static pthread_t kernel_thread
;
163 static pthread_t dispatch_thread
;
164 static pthread_t health_thread
;
165 static pthread_t ht_cleanup_thread
;
166 static pthread_t jul_reg_thread
;
169 * UST registration command queue. This queue is tied with a futex and uses a N
170 * wakers / 1 waiter implemented and detailed in futex.c/.h
172 * The thread_manage_apps and thread_dispatch_ust_registration interact with
173 * this queue and the wait/wake scheme.
175 static struct ust_cmd_queue ust_cmd_queue
;
178 * Pointer initialized before thread creation.
180 * This points to the tracing session list containing the session count and a
181 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
182 * MUST NOT be taken if you call a public function in session.c.
184 * The lock is nested inside the structure: session_list_ptr->lock. Please use
185 * session_lock_list and session_unlock_list for lock acquisition.
187 static struct ltt_session_list
*session_list_ptr
;
189 int ust_consumerd64_fd
= -1;
190 int ust_consumerd32_fd
= -1;
192 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
193 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
194 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
195 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
197 static const char *module_proc_lttng
= "/proc/lttng";
200 * Consumer daemon state which is changed when spawning it, killing it or in
201 * case of a fatal error.
203 enum consumerd_state
{
204 CONSUMER_STARTED
= 1,
205 CONSUMER_STOPPED
= 2,
210 * This consumer daemon state is used to validate if a client command will be
211 * able to reach the consumer. If not, the client is informed. For instance,
212 * doing a "lttng start" when the consumer state is set to ERROR will return an
213 * error to the client.
215 * The following example shows a possible race condition of this scheme:
217 * consumer thread error happens
219 * client cmd checks state -> still OK
220 * consumer thread exit, sets error
221 * client cmd try to talk to consumer
224 * However, since the consumer is a different daemon, we have no way of making
225 * sure the command will reach it safely even with this state flag. This is why
226 * we consider that up to the state validation during command processing, the
227 * command is safe. After that, we can not guarantee the correctness of the
228 * client request vis-a-vis the consumer.
230 static enum consumerd_state ust_consumerd_state
;
231 static enum consumerd_state kernel_consumerd_state
;
234 * Socket timeout for receiving and sending in seconds.
236 static int app_socket_timeout
;
238 /* Set in main() with the current page size. */
241 /* Application health monitoring */
242 struct health_app
*health_sessiond
;
244 /* JUL TCP port for registration. Used by the JUL thread. */
245 unsigned int jul_tcp_port
= DEFAULT_JUL_TCP_PORT
;
248 * Whether sessiond is ready for commands/health check requests.
249 * NR_LTTNG_SESSIOND_READY must match the number of calls to
250 * lttng_sessiond_notify_ready().
252 #define NR_LTTNG_SESSIOND_READY 2
253 int lttng_sessiond_ready
= NR_LTTNG_SESSIOND_READY
;
255 /* Notify parents that we are ready for cmd and health check */
257 void lttng_sessiond_notify_ready(void)
259 if (uatomic_sub_return(<tng_sessiond_ready
, 1) == 0) {
261 * Notify parent pid that we are ready to accept command
262 * for client side. This ppid is the one from the
263 * external process that spawned us.
265 if (opt_sig_parent
) {
270 * Notify the parent of the fork() process that we are
274 kill(child_ppid
, SIGUSR1
);
280 void setup_consumerd_path(void)
282 const char *bin
, *libdir
;
285 * Allow INSTALL_BIN_PATH to be used as a target path for the
286 * native architecture size consumer if CONFIG_CONSUMER*_PATH
287 * has not been defined.
289 #if (CAA_BITS_PER_LONG == 32)
290 if (!consumerd32_bin
[0]) {
291 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
293 if (!consumerd32_libdir
[0]) {
294 consumerd32_libdir
= INSTALL_LIB_PATH
;
296 #elif (CAA_BITS_PER_LONG == 64)
297 if (!consumerd64_bin
[0]) {
298 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
300 if (!consumerd64_libdir
[0]) {
301 consumerd64_libdir
= INSTALL_LIB_PATH
;
304 #error "Unknown bitness"
308 * runtime env. var. overrides the build default.
310 bin
= getenv("LTTNG_CONSUMERD32_BIN");
312 consumerd32_bin
= bin
;
314 bin
= getenv("LTTNG_CONSUMERD64_BIN");
316 consumerd64_bin
= bin
;
318 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
320 consumerd32_libdir
= libdir
;
322 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
324 consumerd64_libdir
= libdir
;
329 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
331 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
337 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
343 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
355 * Check if the thread quit pipe was triggered.
357 * Return 1 if it was triggered else 0;
359 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
361 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
369 * Init thread quit pipe.
371 * Return -1 on error or 0 if all pipes are created.
373 static int init_thread_quit_pipe(void)
377 ret
= pipe(thread_quit_pipe
);
379 PERROR("thread quit pipe");
383 for (i
= 0; i
< 2; i
++) {
384 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
396 * Stop all threads by closing the thread quit pipe.
398 static void stop_threads(void)
402 /* Stopping all threads */
403 DBG("Terminating all threads");
404 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
406 ERR("write error on thread quit pipe");
409 /* Dispatch thread */
410 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
411 futex_nto1_wake(&ust_cmd_queue
.futex
);
415 * Close every consumer sockets.
417 static void close_consumer_sockets(void)
421 if (kconsumer_data
.err_sock
>= 0) {
422 ret
= close(kconsumer_data
.err_sock
);
424 PERROR("kernel consumer err_sock close");
427 if (ustconsumer32_data
.err_sock
>= 0) {
428 ret
= close(ustconsumer32_data
.err_sock
);
430 PERROR("UST consumerd32 err_sock close");
433 if (ustconsumer64_data
.err_sock
>= 0) {
434 ret
= close(ustconsumer64_data
.err_sock
);
436 PERROR("UST consumerd64 err_sock close");
439 if (kconsumer_data
.cmd_sock
>= 0) {
440 ret
= close(kconsumer_data
.cmd_sock
);
442 PERROR("kernel consumer cmd_sock close");
445 if (ustconsumer32_data
.cmd_sock
>= 0) {
446 ret
= close(ustconsumer32_data
.cmd_sock
);
448 PERROR("UST consumerd32 cmd_sock close");
451 if (ustconsumer64_data
.cmd_sock
>= 0) {
452 ret
= close(ustconsumer64_data
.cmd_sock
);
454 PERROR("UST consumerd64 cmd_sock close");
462 static void cleanup(void)
465 struct ltt_session
*sess
, *stmp
;
471 * Close the thread quit pipe. It has already done its job,
472 * since we are now called.
474 utils_close_pipe(thread_quit_pipe
);
477 * If opt_pidfile is undefined, the default file will be wiped when
478 * removing the rundir.
481 ret
= remove(opt_pidfile
);
483 PERROR("remove pidfile %s", opt_pidfile
);
487 DBG("Removing sessiond and consumerd content of directory %s", rundir
);
490 snprintf(path
, PATH_MAX
,
492 rundir
, DEFAULT_LTTNG_SESSIOND_PIDFILE
);
493 DBG("Removing %s", path
);
496 snprintf(path
, PATH_MAX
, "%s/%s", rundir
,
497 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE
);
498 DBG("Removing %s", path
);
502 snprintf(path
, PATH_MAX
,
503 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
505 DBG("Removing %s", path
);
508 snprintf(path
, PATH_MAX
,
509 DEFAULT_KCONSUMERD_PATH
,
511 DBG("Removing directory %s", path
);
514 /* ust consumerd 32 */
515 snprintf(path
, PATH_MAX
,
516 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
518 DBG("Removing %s", path
);
521 snprintf(path
, PATH_MAX
,
522 DEFAULT_USTCONSUMERD32_PATH
,
524 DBG("Removing directory %s", path
);
527 /* ust consumerd 64 */
528 snprintf(path
, PATH_MAX
,
529 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
531 DBG("Removing %s", path
);
534 snprintf(path
, PATH_MAX
,
535 DEFAULT_USTCONSUMERD64_PATH
,
537 DBG("Removing directory %s", path
);
541 * We do NOT rmdir rundir because there are other processes
542 * using it, for instance lttng-relayd, which can start in
543 * parallel with this teardown.
548 DBG("Cleaning up all sessions");
550 /* Destroy session list mutex */
551 if (session_list_ptr
!= NULL
) {
552 pthread_mutex_destroy(&session_list_ptr
->lock
);
554 /* Cleanup ALL session */
555 cds_list_for_each_entry_safe(sess
, stmp
,
556 &session_list_ptr
->head
, list
) {
557 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
561 DBG("Closing all UST sockets");
562 ust_app_clean_list();
563 buffer_reg_destroy_registries();
565 if (is_root
&& !opt_no_kernel
) {
566 DBG2("Closing kernel fd");
567 if (kernel_tracer_fd
>= 0) {
568 ret
= close(kernel_tracer_fd
);
573 DBG("Unloading kernel modules");
574 modprobe_remove_lttng_all();
577 close_consumer_sockets();
580 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
581 "Matthew, BEET driven development works!%c[%dm",
582 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
587 * Send data on a unix socket using the liblttsessiondcomm API.
589 * Return lttcomm error code.
591 static int send_unix_sock(int sock
, void *buf
, size_t len
)
593 /* Check valid length */
598 return lttcomm_send_unix_sock(sock
, buf
, len
);
602 * Free memory of a command context structure.
604 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
606 DBG("Clean command context structure");
608 if ((*cmd_ctx
)->llm
) {
609 free((*cmd_ctx
)->llm
);
611 if ((*cmd_ctx
)->lsm
) {
612 free((*cmd_ctx
)->lsm
);
620 * Notify UST applications using the shm mmap futex.
622 static int notify_ust_apps(int active
)
626 DBG("Notifying applications of session daemon state: %d", active
);
628 /* See shm.c for this call implying mmap, shm and futex calls */
629 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
630 if (wait_shm_mmap
== NULL
) {
634 /* Wake waiting process */
635 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
637 /* Apps notified successfully */
645 * Setup the outgoing data buffer for the response (llm) by allocating the
646 * right amount of memory and copying the original information from the lsm
649 * Return total size of the buffer pointed by buf.
651 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
657 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
658 if (cmd_ctx
->llm
== NULL
) {
664 /* Copy common data */
665 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
666 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
668 cmd_ctx
->llm
->data_size
= size
;
669 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
678 * Update the kernel poll set of all channel fd available over all tracing
679 * session. Add the wakeup pipe at the end of the set.
681 static int update_kernel_poll(struct lttng_poll_event
*events
)
684 struct ltt_session
*session
;
685 struct ltt_kernel_channel
*channel
;
687 DBG("Updating kernel poll set");
690 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
691 session_lock(session
);
692 if (session
->kernel_session
== NULL
) {
693 session_unlock(session
);
697 cds_list_for_each_entry(channel
,
698 &session
->kernel_session
->channel_list
.head
, list
) {
699 /* Add channel fd to the kernel poll set */
700 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
702 session_unlock(session
);
705 DBG("Channel fd %d added to kernel set", channel
->fd
);
707 session_unlock(session
);
709 session_unlock_list();
714 session_unlock_list();
719 * Find the channel fd from 'fd' over all tracing session. When found, check
720 * for new channel stream and send those stream fds to the kernel consumer.
722 * Useful for CPU hotplug feature.
724 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
727 struct ltt_session
*session
;
728 struct ltt_kernel_session
*ksess
;
729 struct ltt_kernel_channel
*channel
;
731 DBG("Updating kernel streams for channel fd %d", fd
);
734 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
735 session_lock(session
);
736 if (session
->kernel_session
== NULL
) {
737 session_unlock(session
);
740 ksess
= session
->kernel_session
;
742 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
743 if (channel
->fd
== fd
) {
744 DBG("Channel found, updating kernel streams");
745 ret
= kernel_open_channel_stream(channel
);
749 /* Update the stream global counter */
750 ksess
->stream_count_global
+= ret
;
753 * Have we already sent fds to the consumer? If yes, it means
754 * that tracing is started so it is safe to send our updated
757 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
758 struct lttng_ht_iter iter
;
759 struct consumer_socket
*socket
;
762 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
763 &iter
.iter
, socket
, node
.node
) {
764 pthread_mutex_lock(socket
->lock
);
765 ret
= kernel_consumer_send_channel_stream(socket
,
767 session
->output_traces
? 1 : 0);
768 pthread_mutex_unlock(socket
->lock
);
779 session_unlock(session
);
781 session_unlock_list();
785 session_unlock(session
);
786 session_unlock_list();
791 * For each tracing session, update newly registered apps. The session list
792 * lock MUST be acquired before calling this.
794 static void update_ust_app(int app_sock
)
796 struct ltt_session
*sess
, *stmp
;
798 /* Consumer is in an ERROR state. Stop any application update. */
799 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
800 /* Stop the update process since the consumer is dead. */
804 /* For all tracing session(s) */
805 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
807 if (sess
->ust_session
) {
808 ust_app_global_update(sess
->ust_session
, app_sock
);
810 session_unlock(sess
);
815 * This thread manage event coming from the kernel.
817 * Features supported in this thread:
820 static void *thread_manage_kernel(void *data
)
822 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
823 uint32_t revents
, nb_fd
;
825 struct lttng_poll_event events
;
827 DBG("[thread] Thread manage kernel started");
829 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_KERNEL
);
832 * This first step of the while is to clean this structure which could free
833 * non NULL pointers so initialize it before the loop.
835 lttng_poll_init(&events
);
837 if (testpoint(sessiond_thread_manage_kernel
)) {
838 goto error_testpoint
;
841 health_code_update();
843 if (testpoint(sessiond_thread_manage_kernel_before_loop
)) {
844 goto error_testpoint
;
848 health_code_update();
850 if (update_poll_flag
== 1) {
851 /* Clean events object. We are about to populate it again. */
852 lttng_poll_clean(&events
);
854 ret
= sessiond_set_thread_pollset(&events
, 2);
856 goto error_poll_create
;
859 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
864 /* This will add the available kernel channel if any. */
865 ret
= update_kernel_poll(&events
);
869 update_poll_flag
= 0;
872 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
874 /* Poll infinite value of time */
877 ret
= lttng_poll_wait(&events
, -1);
881 * Restart interrupted system call.
883 if (errno
== EINTR
) {
887 } else if (ret
== 0) {
888 /* Should not happen since timeout is infinite */
889 ERR("Return value of poll is 0 with an infinite timeout.\n"
890 "This should not have happened! Continuing...");
896 for (i
= 0; i
< nb_fd
; i
++) {
897 /* Fetch once the poll data */
898 revents
= LTTNG_POLL_GETEV(&events
, i
);
899 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
901 health_code_update();
903 /* Thread quit pipe has been closed. Killing thread. */
904 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
910 /* Check for data on kernel pipe */
911 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
912 (void) lttng_read(kernel_poll_pipe
[0],
915 * Ret value is useless here, if this pipe gets any actions an
916 * update is required anyway.
918 update_poll_flag
= 1;
922 * New CPU detected by the kernel. Adding kernel stream to
923 * kernel session and updating the kernel consumer
925 if (revents
& LPOLLIN
) {
926 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
932 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
933 * and unregister kernel stream at this point.
942 lttng_poll_clean(&events
);
945 utils_close_pipe(kernel_poll_pipe
);
946 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
949 ERR("Health error occurred in %s", __func__
);
950 WARN("Kernel thread died unexpectedly. "
951 "Kernel tracing can continue but CPU hotplug is disabled.");
953 health_unregister(health_sessiond
);
954 DBG("Kernel thread dying");
959 * Signal pthread condition of the consumer data that the thread.
961 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
963 pthread_mutex_lock(&data
->cond_mutex
);
966 * The state is set before signaling. It can be any value, it's the waiter
967 * job to correctly interpret this condition variable associated to the
968 * consumer pthread_cond.
970 * A value of 0 means that the corresponding thread of the consumer data
971 * was not started. 1 indicates that the thread has started and is ready
972 * for action. A negative value means that there was an error during the
975 data
->consumer_thread_is_ready
= state
;
976 (void) pthread_cond_signal(&data
->cond
);
978 pthread_mutex_unlock(&data
->cond_mutex
);
982 * This thread manage the consumer error sent back to the session daemon.
984 static void *thread_manage_consumer(void *data
)
986 int sock
= -1, i
, ret
, pollfd
, err
= -1;
987 uint32_t revents
, nb_fd
;
988 enum lttcomm_return_code code
;
989 struct lttng_poll_event events
;
990 struct consumer_data
*consumer_data
= data
;
992 DBG("[thread] Manage consumer started");
994 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
996 health_code_update();
999 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1000 * metadata_sock. Nothing more will be added to this poll set.
1002 ret
= sessiond_set_thread_pollset(&events
, 3);
1008 * The error socket here is already in a listening state which was done
1009 * just before spawning this thread to avoid a race between the consumer
1010 * daemon exec trying to connect and the listen() call.
1012 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1017 health_code_update();
1019 /* Infinite blocking call, waiting for transmission */
1021 health_poll_entry();
1023 if (testpoint(sessiond_thread_manage_consumer
)) {
1027 ret
= lttng_poll_wait(&events
, -1);
1031 * Restart interrupted system call.
1033 if (errno
== EINTR
) {
1041 for (i
= 0; i
< nb_fd
; i
++) {
1042 /* Fetch once the poll data */
1043 revents
= LTTNG_POLL_GETEV(&events
, i
);
1044 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1046 health_code_update();
1048 /* Thread quit pipe has been closed. Killing thread. */
1049 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1055 /* Event on the registration socket */
1056 if (pollfd
== consumer_data
->err_sock
) {
1057 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1058 ERR("consumer err socket poll error");
1064 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1070 * Set the CLOEXEC flag. Return code is useless because either way, the
1073 (void) utils_set_fd_cloexec(sock
);
1075 health_code_update();
1077 DBG2("Receiving code from consumer err_sock");
1079 /* Getting status code from kconsumerd */
1080 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1081 sizeof(enum lttcomm_return_code
));
1086 health_code_update();
1088 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1089 /* Connect both socket, command and metadata. */
1090 consumer_data
->cmd_sock
=
1091 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1092 consumer_data
->metadata_fd
=
1093 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1094 if (consumer_data
->cmd_sock
< 0
1095 || consumer_data
->metadata_fd
< 0) {
1096 PERROR("consumer connect cmd socket");
1097 /* On error, signal condition and quit. */
1098 signal_consumer_condition(consumer_data
, -1);
1101 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1102 /* Create metadata socket lock. */
1103 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1104 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1105 PERROR("zmalloc pthread mutex");
1109 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1111 signal_consumer_condition(consumer_data
, 1);
1112 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1113 DBG("Consumer metadata socket ready (fd: %d)",
1114 consumer_data
->metadata_fd
);
1116 ERR("consumer error when waiting for SOCK_READY : %s",
1117 lttcomm_get_readable_code(-code
));
1121 /* Remove the consumerd error sock since we've established a connexion */
1122 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1127 /* Add new accepted error socket. */
1128 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1133 /* Add metadata socket that is successfully connected. */
1134 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1135 LPOLLIN
| LPOLLRDHUP
);
1140 health_code_update();
1142 /* Infinite blocking call, waiting for transmission */
1145 health_poll_entry();
1146 ret
= lttng_poll_wait(&events
, -1);
1150 * Restart interrupted system call.
1152 if (errno
== EINTR
) {
1160 for (i
= 0; i
< nb_fd
; i
++) {
1161 /* Fetch once the poll data */
1162 revents
= LTTNG_POLL_GETEV(&events
, i
);
1163 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1165 health_code_update();
1167 /* Thread quit pipe has been closed. Killing thread. */
1168 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1174 if (pollfd
== sock
) {
1175 /* Event on the consumerd socket */
1176 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1177 ERR("consumer err socket second poll error");
1180 health_code_update();
1181 /* Wait for any kconsumerd error */
1182 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1183 sizeof(enum lttcomm_return_code
));
1185 ERR("consumer closed the command socket");
1189 ERR("consumer return code : %s",
1190 lttcomm_get_readable_code(-code
));
1193 } else if (pollfd
== consumer_data
->metadata_fd
) {
1194 /* UST metadata requests */
1195 ret
= ust_consumer_metadata_request(
1196 &consumer_data
->metadata_sock
);
1198 ERR("Handling metadata request");
1203 ERR("Unknown pollfd");
1207 health_code_update();
1213 * We lock here because we are about to close the sockets and some other
1214 * thread might be using them so get exclusive access which will abort all
1215 * other consumer command by other threads.
1217 pthread_mutex_lock(&consumer_data
->lock
);
1219 /* Immediately set the consumerd state to stopped */
1220 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1221 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1222 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1223 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1224 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1226 /* Code flow error... */
1230 if (consumer_data
->err_sock
>= 0) {
1231 ret
= close(consumer_data
->err_sock
);
1235 consumer_data
->err_sock
= -1;
1237 if (consumer_data
->cmd_sock
>= 0) {
1238 ret
= close(consumer_data
->cmd_sock
);
1242 consumer_data
->cmd_sock
= -1;
1244 if (*consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1245 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1258 unlink(consumer_data
->err_unix_sock_path
);
1259 unlink(consumer_data
->cmd_unix_sock_path
);
1260 consumer_data
->pid
= 0;
1261 pthread_mutex_unlock(&consumer_data
->lock
);
1263 /* Cleanup metadata socket mutex. */
1264 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1265 free(consumer_data
->metadata_sock
.lock
);
1267 lttng_poll_clean(&events
);
1271 ERR("Health error occurred in %s", __func__
);
1273 health_unregister(health_sessiond
);
1274 DBG("consumer thread cleanup completed");
1280 * This thread manage application communication.
1282 static void *thread_manage_apps(void *data
)
1284 int i
, ret
, pollfd
, err
= -1;
1286 uint32_t revents
, nb_fd
;
1287 struct lttng_poll_event events
;
1289 DBG("[thread] Manage application started");
1291 rcu_register_thread();
1292 rcu_thread_online();
1294 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1296 if (testpoint(sessiond_thread_manage_apps
)) {
1297 goto error_testpoint
;
1300 health_code_update();
1302 ret
= sessiond_set_thread_pollset(&events
, 2);
1304 goto error_poll_create
;
1307 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1312 if (testpoint(sessiond_thread_manage_apps_before_loop
)) {
1316 health_code_update();
1319 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1321 /* Inifinite blocking call, waiting for transmission */
1323 health_poll_entry();
1324 ret
= lttng_poll_wait(&events
, -1);
1328 * Restart interrupted system call.
1330 if (errno
== EINTR
) {
1338 for (i
= 0; i
< nb_fd
; i
++) {
1339 /* Fetch once the poll data */
1340 revents
= LTTNG_POLL_GETEV(&events
, i
);
1341 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1343 health_code_update();
1345 /* Thread quit pipe has been closed. Killing thread. */
1346 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1352 /* Inspect the apps cmd pipe */
1353 if (pollfd
== apps_cmd_pipe
[0]) {
1354 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1355 ERR("Apps command pipe error");
1357 } else if (revents
& LPOLLIN
) {
1361 size_ret
= lttng_read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1362 if (size_ret
< sizeof(sock
)) {
1363 PERROR("read apps cmd pipe");
1367 health_code_update();
1370 * We only monitor the error events of the socket. This
1371 * thread does not handle any incoming data from UST
1374 ret
= lttng_poll_add(&events
, sock
,
1375 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1380 DBG("Apps with sock %d added to poll set", sock
);
1384 * At this point, we know that a registered application made
1385 * the event at poll_wait.
1387 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1388 /* Removing from the poll set */
1389 ret
= lttng_poll_del(&events
, pollfd
);
1394 /* Socket closed on remote end. */
1395 ust_app_unregister(pollfd
);
1399 health_code_update();
1405 lttng_poll_clean(&events
);
1408 utils_close_pipe(apps_cmd_pipe
);
1409 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1412 * We don't clean the UST app hash table here since already registered
1413 * applications can still be controlled so let them be until the session
1414 * daemon dies or the applications stop.
1419 ERR("Health error occurred in %s", __func__
);
1421 health_unregister(health_sessiond
);
1422 DBG("Application communication apps thread cleanup complete");
1423 rcu_thread_offline();
1424 rcu_unregister_thread();
1429 * Send a socket to a thread This is called from the dispatch UST registration
1430 * thread once all sockets are set for the application.
1432 * The sock value can be invalid, we don't really care, the thread will handle
1433 * it and make the necessary cleanup if so.
1435 * On success, return 0 else a negative value being the errno message of the
1438 static int send_socket_to_thread(int fd
, int sock
)
1443 * It's possible that the FD is set as invalid with -1 concurrently just
1444 * before calling this function being a shutdown state of the thread.
1451 ret
= lttng_write(fd
, &sock
, sizeof(sock
));
1452 if (ret
< sizeof(sock
)) {
1453 PERROR("write apps pipe %d", fd
);
1460 /* All good. Don't send back the write positive ret value. */
1467 * Sanitize the wait queue of the dispatch registration thread meaning removing
1468 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1469 * notify socket is never received.
1471 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1473 int ret
, nb_fd
= 0, i
;
1474 unsigned int fd_added
= 0;
1475 struct lttng_poll_event events
;
1476 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1480 lttng_poll_init(&events
);
1482 /* Just skip everything for an empty queue. */
1483 if (!wait_queue
->count
) {
1487 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1492 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1493 &wait_queue
->head
, head
) {
1494 assert(wait_node
->app
);
1495 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1496 LPOLLHUP
| LPOLLERR
);
1509 * Poll but don't block so we can quickly identify the faulty events and
1510 * clean them afterwards from the wait queue.
1512 ret
= lttng_poll_wait(&events
, 0);
1518 for (i
= 0; i
< nb_fd
; i
++) {
1519 /* Get faulty FD. */
1520 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1521 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1523 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1524 &wait_queue
->head
, head
) {
1525 if (pollfd
== wait_node
->app
->sock
&&
1526 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1527 cds_list_del(&wait_node
->head
);
1528 wait_queue
->count
--;
1529 ust_app_destroy(wait_node
->app
);
1537 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1541 lttng_poll_clean(&events
);
1545 lttng_poll_clean(&events
);
1547 ERR("Unable to sanitize wait queue");
1552 * Dispatch request from the registration threads to the application
1553 * communication thread.
1555 static void *thread_dispatch_ust_registration(void *data
)
1558 struct cds_wfq_node
*node
;
1559 struct ust_command
*ust_cmd
= NULL
;
1560 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1561 struct ust_reg_wait_queue wait_queue
= {
1565 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1567 health_code_update();
1569 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1571 DBG("[thread] Dispatch UST command started");
1573 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1574 health_code_update();
1576 /* Atomically prepare the queue futex */
1577 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1580 struct ust_app
*app
= NULL
;
1584 * Make sure we don't have node(s) that have hung up before receiving
1585 * the notify socket. This is to clean the list in order to avoid
1586 * memory leaks from notify socket that are never seen.
1588 sanitize_wait_queue(&wait_queue
);
1590 health_code_update();
1591 /* Dequeue command for registration */
1592 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1594 DBG("Woken up but nothing in the UST command queue");
1595 /* Continue thread execution */
1599 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1601 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1602 " gid:%d sock:%d name:%s (version %d.%d)",
1603 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1604 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1605 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1606 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1608 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1609 wait_node
= zmalloc(sizeof(*wait_node
));
1611 PERROR("zmalloc wait_node dispatch");
1612 ret
= close(ust_cmd
->sock
);
1614 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1616 lttng_fd_put(LTTNG_FD_APPS
, 1);
1620 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1622 /* Create application object if socket is CMD. */
1623 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1625 if (!wait_node
->app
) {
1626 ret
= close(ust_cmd
->sock
);
1628 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1630 lttng_fd_put(LTTNG_FD_APPS
, 1);
1636 * Add application to the wait queue so we can set the notify
1637 * socket before putting this object in the global ht.
1639 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1644 * We have to continue here since we don't have the notify
1645 * socket and the application MUST be added to the hash table
1646 * only at that moment.
1651 * Look for the application in the local wait queue and set the
1652 * notify socket if found.
1654 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1655 &wait_queue
.head
, head
) {
1656 health_code_update();
1657 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1658 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1659 cds_list_del(&wait_node
->head
);
1661 app
= wait_node
->app
;
1663 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1669 * With no application at this stage the received socket is
1670 * basically useless so close it before we free the cmd data
1671 * structure for good.
1674 ret
= close(ust_cmd
->sock
);
1676 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1678 lttng_fd_put(LTTNG_FD_APPS
, 1);
1685 * @session_lock_list
1687 * Lock the global session list so from the register up to the
1688 * registration done message, no thread can see the application
1689 * and change its state.
1691 session_lock_list();
1695 * Add application to the global hash table. This needs to be
1696 * done before the update to the UST registry can locate the
1701 /* Set app version. This call will print an error if needed. */
1702 (void) ust_app_version(app
);
1704 /* Send notify socket through the notify pipe. */
1705 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1709 session_unlock_list();
1711 * No notify thread, stop the UST tracing. However, this is
1712 * not an internal error of the this thread thus setting
1713 * the health error code to a normal exit.
1720 * Update newly registered application with the tracing
1721 * registry info already enabled information.
1723 update_ust_app(app
->sock
);
1726 * Don't care about return value. Let the manage apps threads
1727 * handle app unregistration upon socket close.
1729 (void) ust_app_register_done(app
->sock
);
1732 * Even if the application socket has been closed, send the app
1733 * to the thread and unregistration will take place at that
1736 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1739 session_unlock_list();
1741 * No apps. thread, stop the UST tracing. However, this is
1742 * not an internal error of the this thread thus setting
1743 * the health error code to a normal exit.
1750 session_unlock_list();
1752 } while (node
!= NULL
);
1754 health_poll_entry();
1755 /* Futex wait on queue. Blocking call on futex() */
1756 futex_nto1_wait(&ust_cmd_queue
.futex
);
1759 /* Normal exit, no error */
1763 /* Clean up wait queue. */
1764 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1765 &wait_queue
.head
, head
) {
1766 cds_list_del(&wait_node
->head
);
1771 DBG("Dispatch thread dying");
1774 ERR("Health error occurred in %s", __func__
);
1776 health_unregister(health_sessiond
);
1781 * This thread manage application registration.
1783 static void *thread_registration_apps(void *data
)
1785 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1786 uint32_t revents
, nb_fd
;
1787 struct lttng_poll_event events
;
1789 * Get allocated in this thread, enqueued to a global queue, dequeued and
1790 * freed in the manage apps thread.
1792 struct ust_command
*ust_cmd
= NULL
;
1794 DBG("[thread] Manage application registration started");
1796 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
1798 if (testpoint(sessiond_thread_registration_apps
)) {
1799 goto error_testpoint
;
1802 ret
= lttcomm_listen_unix_sock(apps_sock
);
1808 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1809 * more will be added to this poll set.
1811 ret
= sessiond_set_thread_pollset(&events
, 2);
1813 goto error_create_poll
;
1816 /* Add the application registration socket */
1817 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1819 goto error_poll_add
;
1822 /* Notify all applications to register */
1823 ret
= notify_ust_apps(1);
1825 ERR("Failed to notify applications or create the wait shared memory.\n"
1826 "Execution continues but there might be problem for already\n"
1827 "running applications that wishes to register.");
1831 DBG("Accepting application registration");
1833 /* Inifinite blocking call, waiting for transmission */
1835 health_poll_entry();
1836 ret
= lttng_poll_wait(&events
, -1);
1840 * Restart interrupted system call.
1842 if (errno
== EINTR
) {
1850 for (i
= 0; i
< nb_fd
; i
++) {
1851 health_code_update();
1853 /* Fetch once the poll data */
1854 revents
= LTTNG_POLL_GETEV(&events
, i
);
1855 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1857 /* Thread quit pipe has been closed. Killing thread. */
1858 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1864 /* Event on the registration socket */
1865 if (pollfd
== apps_sock
) {
1866 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1867 ERR("Register apps socket poll error");
1869 } else if (revents
& LPOLLIN
) {
1870 sock
= lttcomm_accept_unix_sock(apps_sock
);
1876 * Set socket timeout for both receiving and ending.
1877 * app_socket_timeout is in seconds, whereas
1878 * lttcomm_setsockopt_rcv_timeout and
1879 * lttcomm_setsockopt_snd_timeout expect msec as
1882 (void) lttcomm_setsockopt_rcv_timeout(sock
,
1883 app_socket_timeout
* 1000);
1884 (void) lttcomm_setsockopt_snd_timeout(sock
,
1885 app_socket_timeout
* 1000);
1888 * Set the CLOEXEC flag. Return code is useless because
1889 * either way, the show must go on.
1891 (void) utils_set_fd_cloexec(sock
);
1893 /* Create UST registration command for enqueuing */
1894 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1895 if (ust_cmd
== NULL
) {
1896 PERROR("ust command zmalloc");
1901 * Using message-based transmissions to ensure we don't
1902 * have to deal with partially received messages.
1904 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1906 ERR("Exhausted file descriptors allowed for applications.");
1916 health_code_update();
1917 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
1920 /* Close socket of the application. */
1925 lttng_fd_put(LTTNG_FD_APPS
, 1);
1929 health_code_update();
1931 ust_cmd
->sock
= sock
;
1934 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1935 " gid:%d sock:%d name:%s (version %d.%d)",
1936 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1937 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1938 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1939 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1942 * Lock free enqueue the registration request. The red pill
1943 * has been taken! This apps will be part of the *system*.
1945 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1948 * Wake the registration queue futex. Implicit memory
1949 * barrier with the exchange in cds_wfq_enqueue.
1951 futex_nto1_wake(&ust_cmd_queue
.futex
);
1961 ERR("Health error occurred in %s", __func__
);
1964 /* Notify that the registration thread is gone */
1967 if (apps_sock
>= 0) {
1968 ret
= close(apps_sock
);
1978 lttng_fd_put(LTTNG_FD_APPS
, 1);
1980 unlink(apps_unix_sock_path
);
1983 lttng_poll_clean(&events
);
1987 DBG("UST Registration thread cleanup complete");
1988 health_unregister(health_sessiond
);
1994 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1995 * exec or it will fails.
1997 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
2000 struct timespec timeout
;
2002 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2003 consumer_data
->consumer_thread_is_ready
= 0;
2005 /* Setup pthread condition */
2006 ret
= pthread_condattr_init(&consumer_data
->condattr
);
2009 PERROR("pthread_condattr_init consumer data");
2014 * Set the monotonic clock in order to make sure we DO NOT jump in time
2015 * between the clock_gettime() call and the timedwait call. See bug #324
2016 * for a more details and how we noticed it.
2018 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
2021 PERROR("pthread_condattr_setclock consumer data");
2025 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
2028 PERROR("pthread_cond_init consumer data");
2032 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
2035 PERROR("pthread_create consumer");
2040 /* We are about to wait on a pthread condition */
2041 pthread_mutex_lock(&consumer_data
->cond_mutex
);
2043 /* Get time for sem_timedwait absolute timeout */
2044 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2046 * Set the timeout for the condition timed wait even if the clock gettime
2047 * call fails since we might loop on that call and we want to avoid to
2048 * increment the timeout too many times.
2050 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2053 * The following loop COULD be skipped in some conditions so this is why we
2054 * set ret to 0 in order to make sure at least one round of the loop is
2060 * Loop until the condition is reached or when a timeout is reached. Note
2061 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2062 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2063 * possible. This loop does not take any chances and works with both of
2066 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2067 if (clock_ret
< 0) {
2068 PERROR("clock_gettime spawn consumer");
2069 /* Infinite wait for the consumerd thread to be ready */
2070 ret
= pthread_cond_wait(&consumer_data
->cond
,
2071 &consumer_data
->cond_mutex
);
2073 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2074 &consumer_data
->cond_mutex
, &timeout
);
2078 /* Release the pthread condition */
2079 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2083 if (ret
== ETIMEDOUT
) {
2085 * Call has timed out so we kill the kconsumerd_thread and return
2088 ERR("Condition timed out. The consumer thread was never ready."
2090 ret
= pthread_cancel(consumer_data
->thread
);
2092 PERROR("pthread_cancel consumer thread");
2095 PERROR("pthread_cond_wait failed consumer thread");
2100 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2101 if (consumer_data
->pid
== 0) {
2102 ERR("Consumerd did not start");
2103 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2106 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2115 * Join consumer thread
2117 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2121 /* Consumer pid must be a real one. */
2122 if (consumer_data
->pid
> 0) {
2124 ret
= kill(consumer_data
->pid
, SIGTERM
);
2126 ERR("Error killing consumer daemon");
2129 return pthread_join(consumer_data
->thread
, &status
);
2136 * Fork and exec a consumer daemon (consumerd).
2138 * Return pid if successful else -1.
2140 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2144 const char *consumer_to_use
;
2145 const char *verbosity
;
2148 DBG("Spawning consumerd");
2155 if (opt_verbose_consumer
) {
2156 verbosity
= "--verbose";
2158 verbosity
= "--quiet";
2160 switch (consumer_data
->type
) {
2161 case LTTNG_CONSUMER_KERNEL
:
2163 * Find out which consumerd to execute. We will first try the
2164 * 64-bit path, then the sessiond's installation directory, and
2165 * fallback on the 32-bit one,
2167 DBG3("Looking for a kernel consumer at these locations:");
2168 DBG3(" 1) %s", consumerd64_bin
);
2169 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2170 DBG3(" 3) %s", consumerd32_bin
);
2171 if (stat(consumerd64_bin
, &st
) == 0) {
2172 DBG3("Found location #1");
2173 consumer_to_use
= consumerd64_bin
;
2174 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2175 DBG3("Found location #2");
2176 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2177 } else if (stat(consumerd32_bin
, &st
) == 0) {
2178 DBG3("Found location #3");
2179 consumer_to_use
= consumerd32_bin
;
2181 DBG("Could not find any valid consumerd executable");
2184 DBG("Using kernel consumer at: %s", consumer_to_use
);
2185 execl(consumer_to_use
,
2186 "lttng-consumerd", verbosity
, "-k",
2187 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2188 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2189 "--group", tracing_group_name
,
2192 case LTTNG_CONSUMER64_UST
:
2194 char *tmpnew
= NULL
;
2196 if (consumerd64_libdir
[0] != '\0') {
2200 tmp
= getenv("LD_LIBRARY_PATH");
2204 tmplen
= strlen("LD_LIBRARY_PATH=")
2205 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2206 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2211 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2212 strcat(tmpnew
, consumerd64_libdir
);
2213 if (tmp
[0] != '\0') {
2214 strcat(tmpnew
, ":");
2215 strcat(tmpnew
, tmp
);
2217 ret
= putenv(tmpnew
);
2224 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2225 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2226 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2227 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2228 "--group", tracing_group_name
,
2230 if (consumerd64_libdir
[0] != '\0') {
2238 case LTTNG_CONSUMER32_UST
:
2240 char *tmpnew
= NULL
;
2242 if (consumerd32_libdir
[0] != '\0') {
2246 tmp
= getenv("LD_LIBRARY_PATH");
2250 tmplen
= strlen("LD_LIBRARY_PATH=")
2251 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2252 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2257 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2258 strcat(tmpnew
, consumerd32_libdir
);
2259 if (tmp
[0] != '\0') {
2260 strcat(tmpnew
, ":");
2261 strcat(tmpnew
, tmp
);
2263 ret
= putenv(tmpnew
);
2270 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2271 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2272 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2273 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2274 "--group", tracing_group_name
,
2276 if (consumerd32_libdir
[0] != '\0') {
2285 PERROR("unknown consumer type");
2289 PERROR("kernel start consumer exec");
2292 } else if (pid
> 0) {
2295 PERROR("start consumer fork");
2303 * Spawn the consumerd daemon and session daemon thread.
2305 static int start_consumerd(struct consumer_data
*consumer_data
)
2310 * Set the listen() state on the socket since there is a possible race
2311 * between the exec() of the consumer daemon and this call if place in the
2312 * consumer thread. See bug #366 for more details.
2314 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2319 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2320 if (consumer_data
->pid
!= 0) {
2321 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2325 ret
= spawn_consumerd(consumer_data
);
2327 ERR("Spawning consumerd failed");
2328 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2332 /* Setting up the consumer_data pid */
2333 consumer_data
->pid
= ret
;
2334 DBG2("Consumer pid %d", consumer_data
->pid
);
2335 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2337 DBG2("Spawning consumer control thread");
2338 ret
= spawn_consumer_thread(consumer_data
);
2340 ERR("Fatal error spawning consumer control thread");
2348 /* Cleanup already created sockets on error. */
2349 if (consumer_data
->err_sock
>= 0) {
2352 err
= close(consumer_data
->err_sock
);
2354 PERROR("close consumer data error socket");
2361 * Setup necessary data for kernel tracer action.
2363 static int init_kernel_tracer(void)
2367 /* Modprobe lttng kernel modules */
2368 ret
= modprobe_lttng_control();
2373 /* Open debugfs lttng */
2374 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2375 if (kernel_tracer_fd
< 0) {
2376 DBG("Failed to open %s", module_proc_lttng
);
2381 /* Validate kernel version */
2382 ret
= kernel_validate_version(kernel_tracer_fd
);
2387 ret
= modprobe_lttng_data();
2392 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2396 modprobe_remove_lttng_control();
2397 ret
= close(kernel_tracer_fd
);
2401 kernel_tracer_fd
= -1;
2402 return LTTNG_ERR_KERN_VERSION
;
2405 ret
= close(kernel_tracer_fd
);
2411 modprobe_remove_lttng_control();
2414 WARN("No kernel tracer available");
2415 kernel_tracer_fd
= -1;
2417 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2419 return LTTNG_ERR_KERN_NA
;
2425 * Copy consumer output from the tracing session to the domain session. The
2426 * function also applies the right modification on a per domain basis for the
2427 * trace files destination directory.
2429 * Should *NOT* be called with RCU read-side lock held.
2431 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2434 const char *dir_name
;
2435 struct consumer_output
*consumer
;
2438 assert(session
->consumer
);
2441 case LTTNG_DOMAIN_KERNEL
:
2442 DBG3("Copying tracing session consumer output in kernel session");
2444 * XXX: We should audit the session creation and what this function
2445 * does "extra" in order to avoid a destroy since this function is used
2446 * in the domain session creation (kernel and ust) only. Same for UST
2449 if (session
->kernel_session
->consumer
) {
2450 consumer_destroy_output(session
->kernel_session
->consumer
);
2452 session
->kernel_session
->consumer
=
2453 consumer_copy_output(session
->consumer
);
2454 /* Ease our life a bit for the next part */
2455 consumer
= session
->kernel_session
->consumer
;
2456 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2458 case LTTNG_DOMAIN_JUL
:
2459 case LTTNG_DOMAIN_UST
:
2460 DBG3("Copying tracing session consumer output in UST session");
2461 if (session
->ust_session
->consumer
) {
2462 consumer_destroy_output(session
->ust_session
->consumer
);
2464 session
->ust_session
->consumer
=
2465 consumer_copy_output(session
->consumer
);
2466 /* Ease our life a bit for the next part */
2467 consumer
= session
->ust_session
->consumer
;
2468 dir_name
= DEFAULT_UST_TRACE_DIR
;
2471 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2475 /* Append correct directory to subdir */
2476 strncat(consumer
->subdir
, dir_name
,
2477 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2478 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2487 * Create an UST session and add it to the session ust list.
2489 * Should *NOT* be called with RCU read-side lock held.
2491 static int create_ust_session(struct ltt_session
*session
,
2492 struct lttng_domain
*domain
)
2495 struct ltt_ust_session
*lus
= NULL
;
2499 assert(session
->consumer
);
2501 switch (domain
->type
) {
2502 case LTTNG_DOMAIN_JUL
:
2503 case LTTNG_DOMAIN_UST
:
2506 ERR("Unknown UST domain on create session %d", domain
->type
);
2507 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2511 DBG("Creating UST session");
2513 lus
= trace_ust_create_session(session
->id
);
2515 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2519 lus
->uid
= session
->uid
;
2520 lus
->gid
= session
->gid
;
2521 lus
->output_traces
= session
->output_traces
;
2522 lus
->snapshot_mode
= session
->snapshot_mode
;
2523 lus
->live_timer_interval
= session
->live_timer
;
2524 session
->ust_session
= lus
;
2526 /* Copy session output to the newly created UST session */
2527 ret
= copy_session_consumer(domain
->type
, session
);
2528 if (ret
!= LTTNG_OK
) {
2536 session
->ust_session
= NULL
;
2541 * Create a kernel tracer session then create the default channel.
2543 static int create_kernel_session(struct ltt_session
*session
)
2547 DBG("Creating kernel session");
2549 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2551 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2555 /* Code flow safety */
2556 assert(session
->kernel_session
);
2558 /* Copy session output to the newly created Kernel session */
2559 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2560 if (ret
!= LTTNG_OK
) {
2564 /* Create directory(ies) on local filesystem. */
2565 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2566 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2567 ret
= run_as_mkdir_recursive(
2568 session
->kernel_session
->consumer
->dst
.trace_path
,
2569 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2571 if (ret
!= -EEXIST
) {
2572 ERR("Trace directory creation error");
2578 session
->kernel_session
->uid
= session
->uid
;
2579 session
->kernel_session
->gid
= session
->gid
;
2580 session
->kernel_session
->output_traces
= session
->output_traces
;
2581 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2586 trace_kernel_destroy_session(session
->kernel_session
);
2587 session
->kernel_session
= NULL
;
2592 * Count number of session permitted by uid/gid.
2594 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2597 struct ltt_session
*session
;
2599 DBG("Counting number of available session for UID %d GID %d",
2601 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2603 * Only list the sessions the user can control.
2605 if (!session_access_ok(session
, uid
, gid
)) {
2614 * Process the command requested by the lttng client within the command
2615 * context structure. This function make sure that the return structure (llm)
2616 * is set and ready for transmission before returning.
2618 * Return any error encountered or 0 for success.
2620 * "sock" is only used for special-case var. len data.
2622 * Should *NOT* be called with RCU read-side lock held.
2624 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2628 int need_tracing_session
= 1;
2631 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2635 switch (cmd_ctx
->lsm
->cmd_type
) {
2636 case LTTNG_CREATE_SESSION
:
2637 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2638 case LTTNG_CREATE_SESSION_LIVE
:
2639 case LTTNG_DESTROY_SESSION
:
2640 case LTTNG_LIST_SESSIONS
:
2641 case LTTNG_LIST_DOMAINS
:
2642 case LTTNG_START_TRACE
:
2643 case LTTNG_STOP_TRACE
:
2644 case LTTNG_DATA_PENDING
:
2645 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2646 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2647 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2648 case LTTNG_SNAPSHOT_RECORD
:
2655 if (opt_no_kernel
&& need_domain
2656 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2658 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2660 ret
= LTTNG_ERR_KERN_NA
;
2665 /* Deny register consumer if we already have a spawned consumer. */
2666 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2667 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2668 if (kconsumer_data
.pid
> 0) {
2669 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2670 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2673 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2677 * Check for command that don't needs to allocate a returned payload. We do
2678 * this here so we don't have to make the call for no payload at each
2681 switch(cmd_ctx
->lsm
->cmd_type
) {
2682 case LTTNG_LIST_SESSIONS
:
2683 case LTTNG_LIST_TRACEPOINTS
:
2684 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2685 case LTTNG_LIST_DOMAINS
:
2686 case LTTNG_LIST_CHANNELS
:
2687 case LTTNG_LIST_EVENTS
:
2690 /* Setup lttng message with no payload */
2691 ret
= setup_lttng_msg(cmd_ctx
, 0);
2693 /* This label does not try to unlock the session */
2694 goto init_setup_error
;
2698 /* Commands that DO NOT need a session. */
2699 switch (cmd_ctx
->lsm
->cmd_type
) {
2700 case LTTNG_CREATE_SESSION
:
2701 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2702 case LTTNG_CREATE_SESSION_LIVE
:
2703 case LTTNG_CALIBRATE
:
2704 case LTTNG_LIST_SESSIONS
:
2705 case LTTNG_LIST_TRACEPOINTS
:
2706 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2707 need_tracing_session
= 0;
2710 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2712 * We keep the session list lock across _all_ commands
2713 * for now, because the per-session lock does not
2714 * handle teardown properly.
2716 session_lock_list();
2717 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2718 if (cmd_ctx
->session
== NULL
) {
2719 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2722 /* Acquire lock for the session */
2723 session_lock(cmd_ctx
->session
);
2733 * Check domain type for specific "pre-action".
2735 switch (cmd_ctx
->lsm
->domain
.type
) {
2736 case LTTNG_DOMAIN_KERNEL
:
2738 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2742 /* Kernel tracer check */
2743 if (kernel_tracer_fd
== -1) {
2744 /* Basically, load kernel tracer modules */
2745 ret
= init_kernel_tracer();
2751 /* Consumer is in an ERROR state. Report back to client */
2752 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2753 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2757 /* Need a session for kernel command */
2758 if (need_tracing_session
) {
2759 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2760 ret
= create_kernel_session(cmd_ctx
->session
);
2762 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2767 /* Start the kernel consumer daemon */
2768 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2769 if (kconsumer_data
.pid
== 0 &&
2770 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2771 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2772 ret
= start_consumerd(&kconsumer_data
);
2774 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2777 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2779 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2783 * The consumer was just spawned so we need to add the socket to
2784 * the consumer output of the session if exist.
2786 ret
= consumer_create_socket(&kconsumer_data
,
2787 cmd_ctx
->session
->kernel_session
->consumer
);
2794 case LTTNG_DOMAIN_JUL
:
2795 case LTTNG_DOMAIN_UST
:
2797 if (!ust_app_supported()) {
2798 ret
= LTTNG_ERR_NO_UST
;
2801 /* Consumer is in an ERROR state. Report back to client */
2802 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2803 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2807 if (need_tracing_session
) {
2808 /* Create UST session if none exist. */
2809 if (cmd_ctx
->session
->ust_session
== NULL
) {
2810 ret
= create_ust_session(cmd_ctx
->session
,
2811 &cmd_ctx
->lsm
->domain
);
2812 if (ret
!= LTTNG_OK
) {
2817 /* Start the UST consumer daemons */
2819 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2820 if (consumerd64_bin
[0] != '\0' &&
2821 ustconsumer64_data
.pid
== 0 &&
2822 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2823 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2824 ret
= start_consumerd(&ustconsumer64_data
);
2826 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2827 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2831 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2832 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2834 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2838 * Setup socket for consumer 64 bit. No need for atomic access
2839 * since it was set above and can ONLY be set in this thread.
2841 ret
= consumer_create_socket(&ustconsumer64_data
,
2842 cmd_ctx
->session
->ust_session
->consumer
);
2848 if (consumerd32_bin
[0] != '\0' &&
2849 ustconsumer32_data
.pid
== 0 &&
2850 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2851 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2852 ret
= start_consumerd(&ustconsumer32_data
);
2854 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2855 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2859 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2860 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2862 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2866 * Setup socket for consumer 64 bit. No need for atomic access
2867 * since it was set above and can ONLY be set in this thread.
2869 ret
= consumer_create_socket(&ustconsumer32_data
,
2870 cmd_ctx
->session
->ust_session
->consumer
);
2882 /* Validate consumer daemon state when start/stop trace command */
2883 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2884 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2885 switch (cmd_ctx
->lsm
->domain
.type
) {
2886 case LTTNG_DOMAIN_JUL
:
2887 case LTTNG_DOMAIN_UST
:
2888 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2889 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2893 case LTTNG_DOMAIN_KERNEL
:
2894 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2895 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2903 * Check that the UID or GID match that of the tracing session.
2904 * The root user can interact with all sessions.
2906 if (need_tracing_session
) {
2907 if (!session_access_ok(cmd_ctx
->session
,
2908 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2909 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2910 ret
= LTTNG_ERR_EPERM
;
2916 * Send relayd information to consumer as soon as we have a domain and a
2919 if (cmd_ctx
->session
&& need_domain
) {
2921 * Setup relayd if not done yet. If the relayd information was already
2922 * sent to the consumer, this call will gracefully return.
2924 ret
= cmd_setup_relayd(cmd_ctx
->session
);
2925 if (ret
!= LTTNG_OK
) {
2930 /* Process by command type */
2931 switch (cmd_ctx
->lsm
->cmd_type
) {
2932 case LTTNG_ADD_CONTEXT
:
2934 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2935 cmd_ctx
->lsm
->u
.context
.channel_name
,
2936 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2939 case LTTNG_DISABLE_CHANNEL
:
2941 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2942 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2945 case LTTNG_DISABLE_EVENT
:
2947 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2948 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2949 cmd_ctx
->lsm
->u
.disable
.name
);
2952 case LTTNG_DISABLE_ALL_EVENT
:
2954 DBG("Disabling all events");
2956 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2957 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2960 case LTTNG_ENABLE_CHANNEL
:
2962 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
2963 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2966 case LTTNG_ENABLE_EVENT
:
2968 struct lttng_event_exclusion
*exclusion
= NULL
;
2969 struct lttng_filter_bytecode
*bytecode
= NULL
;
2971 /* Handle exclusion events and receive it from the client. */
2972 if (cmd_ctx
->lsm
->u
.enable
.exclusion_count
> 0) {
2973 size_t count
= cmd_ctx
->lsm
->u
.enable
.exclusion_count
;
2975 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
2976 (count
* LTTNG_SYMBOL_NAME_LEN
));
2978 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
2982 DBG("Receiving var len exclusion event list from client ...");
2983 exclusion
->count
= count
;
2984 ret
= lttcomm_recv_unix_sock(sock
, exclusion
->names
,
2985 count
* LTTNG_SYMBOL_NAME_LEN
);
2987 DBG("Nothing recv() from client var len data... continuing");
2990 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
2995 /* Handle filter and get bytecode from client. */
2996 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> 0) {
2997 size_t bytecode_len
= cmd_ctx
->lsm
->u
.enable
.bytecode_len
;
2999 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3000 ret
= LTTNG_ERR_FILTER_INVAL
;
3005 bytecode
= zmalloc(bytecode_len
);
3008 ret
= LTTNG_ERR_FILTER_NOMEM
;
3012 /* Receive var. len. data */
3013 DBG("Receiving var len filter's bytecode from client ...");
3014 ret
= lttcomm_recv_unix_sock(sock
, bytecode
, bytecode_len
);
3016 DBG("Nothing recv() from client car len data... continuing");
3020 ret
= LTTNG_ERR_FILTER_INVAL
;
3024 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
3027 ret
= LTTNG_ERR_FILTER_INVAL
;
3032 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3033 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3034 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, exclusion
,
3035 kernel_poll_pipe
[1]);
3038 case LTTNG_ENABLE_ALL_EVENT
:
3040 DBG("Enabling all events");
3042 ret
= cmd_enable_event_all(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3043 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3044 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
3047 case LTTNG_LIST_TRACEPOINTS
:
3049 struct lttng_event
*events
;
3052 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3053 if (nb_events
< 0) {
3054 /* Return value is a negative lttng_error_code. */
3060 * Setup lttng message with payload size set to the event list size in
3061 * bytes and then copy list into the llm payload.
3063 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3069 /* Copy event list into message payload */
3070 memcpy(cmd_ctx
->llm
->payload
, events
,
3071 sizeof(struct lttng_event
) * nb_events
);
3078 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3080 struct lttng_event_field
*fields
;
3083 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
3085 if (nb_fields
< 0) {
3086 /* Return value is a negative lttng_error_code. */
3092 * Setup lttng message with payload size set to the event list size in
3093 * bytes and then copy list into the llm payload.
3095 ret
= setup_lttng_msg(cmd_ctx
,
3096 sizeof(struct lttng_event_field
) * nb_fields
);
3102 /* Copy event list into message payload */
3103 memcpy(cmd_ctx
->llm
->payload
, fields
,
3104 sizeof(struct lttng_event_field
) * nb_fields
);
3111 case LTTNG_SET_CONSUMER_URI
:
3114 struct lttng_uri
*uris
;
3116 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3117 len
= nb_uri
* sizeof(struct lttng_uri
);
3120 ret
= LTTNG_ERR_INVALID
;
3124 uris
= zmalloc(len
);
3126 ret
= LTTNG_ERR_FATAL
;
3130 /* Receive variable len data */
3131 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3132 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3134 DBG("No URIs received from client... continuing");
3136 ret
= LTTNG_ERR_SESSION_FAIL
;
3141 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3143 if (ret
!= LTTNG_OK
) {
3149 * XXX: 0 means that this URI should be applied on the session. Should
3150 * be a DOMAIN enuam.
3152 if (cmd_ctx
->lsm
->domain
.type
== 0) {
3153 /* Add the URI for the UST session if a consumer is present. */
3154 if (cmd_ctx
->session
->ust_session
&&
3155 cmd_ctx
->session
->ust_session
->consumer
) {
3156 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
3158 } else if (cmd_ctx
->session
->kernel_session
&&
3159 cmd_ctx
->session
->kernel_session
->consumer
) {
3160 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
3161 cmd_ctx
->session
, nb_uri
, uris
);
3169 case LTTNG_START_TRACE
:
3171 ret
= cmd_start_trace(cmd_ctx
->session
);
3174 case LTTNG_STOP_TRACE
:
3176 ret
= cmd_stop_trace(cmd_ctx
->session
);
3179 case LTTNG_CREATE_SESSION
:
3182 struct lttng_uri
*uris
= NULL
;
3184 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3185 len
= nb_uri
* sizeof(struct lttng_uri
);
3188 uris
= zmalloc(len
);
3190 ret
= LTTNG_ERR_FATAL
;
3194 /* Receive variable len data */
3195 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3196 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3198 DBG("No URIs received from client... continuing");
3200 ret
= LTTNG_ERR_SESSION_FAIL
;
3205 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3206 DBG("Creating session with ONE network URI is a bad call");
3207 ret
= LTTNG_ERR_SESSION_FAIL
;
3213 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3214 &cmd_ctx
->creds
, 0);
3220 case LTTNG_DESTROY_SESSION
:
3222 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3224 /* Set session to NULL so we do not unlock it after free. */
3225 cmd_ctx
->session
= NULL
;
3228 case LTTNG_LIST_DOMAINS
:
3231 struct lttng_domain
*domains
;
3233 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3235 /* Return value is a negative lttng_error_code. */
3240 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3246 /* Copy event list into message payload */
3247 memcpy(cmd_ctx
->llm
->payload
, domains
,
3248 nb_dom
* sizeof(struct lttng_domain
));
3255 case LTTNG_LIST_CHANNELS
:
3258 struct lttng_channel
*channels
;
3260 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3261 cmd_ctx
->session
, &channels
);
3263 /* Return value is a negative lttng_error_code. */
3268 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3274 /* Copy event list into message payload */
3275 memcpy(cmd_ctx
->llm
->payload
, channels
,
3276 nb_chan
* sizeof(struct lttng_channel
));
3283 case LTTNG_LIST_EVENTS
:
3286 struct lttng_event
*events
= NULL
;
3288 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3289 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3291 /* Return value is a negative lttng_error_code. */
3296 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3302 /* Copy event list into message payload */
3303 memcpy(cmd_ctx
->llm
->payload
, events
,
3304 nb_event
* sizeof(struct lttng_event
));
3311 case LTTNG_LIST_SESSIONS
:
3313 unsigned int nr_sessions
;
3315 session_lock_list();
3316 nr_sessions
= lttng_sessions_count(
3317 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3318 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3320 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3322 session_unlock_list();
3326 /* Filled the session array */
3327 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3328 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3329 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3331 session_unlock_list();
3336 case LTTNG_CALIBRATE
:
3338 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3339 &cmd_ctx
->lsm
->u
.calibrate
);
3342 case LTTNG_REGISTER_CONSUMER
:
3344 struct consumer_data
*cdata
;
3346 switch (cmd_ctx
->lsm
->domain
.type
) {
3347 case LTTNG_DOMAIN_KERNEL
:
3348 cdata
= &kconsumer_data
;
3351 ret
= LTTNG_ERR_UND
;
3355 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3356 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3359 case LTTNG_DATA_PENDING
:
3361 ret
= cmd_data_pending(cmd_ctx
->session
);
3364 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3366 struct lttcomm_lttng_output_id reply
;
3368 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3369 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3370 if (ret
!= LTTNG_OK
) {
3374 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3379 /* Copy output list into message payload */
3380 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3384 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3386 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3387 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3390 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3393 struct lttng_snapshot_output
*outputs
= NULL
;
3395 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3396 if (nb_output
< 0) {
3401 ret
= setup_lttng_msg(cmd_ctx
,
3402 nb_output
* sizeof(struct lttng_snapshot_output
));
3409 /* Copy output list into message payload */
3410 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3411 nb_output
* sizeof(struct lttng_snapshot_output
));
3418 case LTTNG_SNAPSHOT_RECORD
:
3420 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3421 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3422 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3425 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3428 struct lttng_uri
*uris
= NULL
;
3430 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3431 len
= nb_uri
* sizeof(struct lttng_uri
);
3434 uris
= zmalloc(len
);
3436 ret
= LTTNG_ERR_FATAL
;
3440 /* Receive variable len data */
3441 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3442 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3444 DBG("No URIs received from client... continuing");
3446 ret
= LTTNG_ERR_SESSION_FAIL
;
3451 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3452 DBG("Creating session with ONE network URI is a bad call");
3453 ret
= LTTNG_ERR_SESSION_FAIL
;
3459 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
3460 nb_uri
, &cmd_ctx
->creds
);
3464 case LTTNG_CREATE_SESSION_LIVE
:
3467 struct lttng_uri
*uris
= NULL
;
3469 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3470 len
= nb_uri
* sizeof(struct lttng_uri
);
3473 uris
= zmalloc(len
);
3475 ret
= LTTNG_ERR_FATAL
;
3479 /* Receive variable len data */
3480 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3481 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3483 DBG("No URIs received from client... continuing");
3485 ret
= LTTNG_ERR_SESSION_FAIL
;
3490 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3491 DBG("Creating session with ONE network URI is a bad call");
3492 ret
= LTTNG_ERR_SESSION_FAIL
;
3498 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
3499 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
3504 ret
= LTTNG_ERR_UND
;
3509 if (cmd_ctx
->llm
== NULL
) {
3510 DBG("Missing llm structure. Allocating one.");
3511 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3515 /* Set return code */
3516 cmd_ctx
->llm
->ret_code
= ret
;
3518 if (cmd_ctx
->session
) {
3519 session_unlock(cmd_ctx
->session
);
3521 if (need_tracing_session
) {
3522 session_unlock_list();
3529 * Thread managing health check socket.
3531 static void *thread_manage_health(void *data
)
3533 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3534 uint32_t revents
, nb_fd
;
3535 struct lttng_poll_event events
;
3536 struct health_comm_msg msg
;
3537 struct health_comm_reply reply
;
3539 DBG("[thread] Manage health check started");
3541 rcu_register_thread();
3543 /* We might hit an error path before this is created. */
3544 lttng_poll_init(&events
);
3546 /* Create unix socket */
3547 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3549 ERR("Unable to create health check Unix socket");
3555 /* lttng health client socket path permissions */
3556 ret
= chown(health_unix_sock_path
, 0,
3557 utils_get_group_id(tracing_group_name
));
3559 ERR("Unable to set group on %s", health_unix_sock_path
);
3565 ret
= chmod(health_unix_sock_path
,
3566 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3568 ERR("Unable to set permissions on %s", health_unix_sock_path
);
3576 * Set the CLOEXEC flag. Return code is useless because either way, the
3579 (void) utils_set_fd_cloexec(sock
);
3581 ret
= lttcomm_listen_unix_sock(sock
);
3587 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3588 * more will be added to this poll set.
3590 ret
= sessiond_set_thread_pollset(&events
, 2);
3595 /* Add the application registration socket */
3596 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3601 lttng_sessiond_notify_ready();
3604 DBG("Health check ready");
3606 /* Inifinite blocking call, waiting for transmission */
3608 ret
= lttng_poll_wait(&events
, -1);
3611 * Restart interrupted system call.
3613 if (errno
== EINTR
) {
3621 for (i
= 0; i
< nb_fd
; i
++) {
3622 /* Fetch once the poll data */
3623 revents
= LTTNG_POLL_GETEV(&events
, i
);
3624 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3626 /* Thread quit pipe has been closed. Killing thread. */
3627 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3633 /* Event on the registration socket */
3634 if (pollfd
== sock
) {
3635 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3636 ERR("Health socket poll error");
3642 new_sock
= lttcomm_accept_unix_sock(sock
);
3648 * Set the CLOEXEC flag. Return code is useless because either way, the
3651 (void) utils_set_fd_cloexec(new_sock
);
3653 DBG("Receiving data from client for health...");
3654 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3656 DBG("Nothing recv() from client... continuing");
3657 ret
= close(new_sock
);
3665 rcu_thread_online();
3668 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
3670 * health_check_state returns 0 if health is
3673 if (!health_check_state(health_sessiond
, i
)) {
3674 reply
.ret_code
|= 1ULL << i
;
3678 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
3680 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3682 ERR("Failed to send health data back to client");
3685 /* End of transmission */
3686 ret
= close(new_sock
);
3696 ERR("Health error occurred in %s", __func__
);
3698 DBG("Health check thread dying");
3699 unlink(health_unix_sock_path
);
3707 lttng_poll_clean(&events
);
3709 rcu_unregister_thread();
3714 * This thread manage all clients request using the unix client socket for
3717 static void *thread_manage_clients(void *data
)
3719 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3721 uint32_t revents
, nb_fd
;
3722 struct command_ctx
*cmd_ctx
= NULL
;
3723 struct lttng_poll_event events
;
3725 DBG("[thread] Manage client started");
3727 rcu_register_thread();
3729 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
3731 health_code_update();
3733 ret
= lttcomm_listen_unix_sock(client_sock
);
3739 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3740 * more will be added to this poll set.
3742 ret
= sessiond_set_thread_pollset(&events
, 2);
3744 goto error_create_poll
;
3747 /* Add the application registration socket */
3748 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3753 lttng_sessiond_notify_ready();
3755 /* This testpoint is after we signal readiness to the parent. */
3756 if (testpoint(sessiond_thread_manage_clients
)) {
3760 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
3764 health_code_update();
3767 DBG("Accepting client command ...");
3769 /* Inifinite blocking call, waiting for transmission */
3771 health_poll_entry();
3772 ret
= lttng_poll_wait(&events
, -1);
3776 * Restart interrupted system call.
3778 if (errno
== EINTR
) {
3786 for (i
= 0; i
< nb_fd
; i
++) {
3787 /* Fetch once the poll data */
3788 revents
= LTTNG_POLL_GETEV(&events
, i
);
3789 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3791 health_code_update();
3793 /* Thread quit pipe has been closed. Killing thread. */
3794 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3800 /* Event on the registration socket */
3801 if (pollfd
== client_sock
) {
3802 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3803 ERR("Client socket poll error");
3809 DBG("Wait for client response");
3811 health_code_update();
3813 sock
= lttcomm_accept_unix_sock(client_sock
);
3819 * Set the CLOEXEC flag. Return code is useless because either way, the
3822 (void) utils_set_fd_cloexec(sock
);
3824 /* Set socket option for credentials retrieval */
3825 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3830 /* Allocate context command to process the client request */
3831 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3832 if (cmd_ctx
== NULL
) {
3833 PERROR("zmalloc cmd_ctx");
3837 /* Allocate data buffer for reception */
3838 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3839 if (cmd_ctx
->lsm
== NULL
) {
3840 PERROR("zmalloc cmd_ctx->lsm");
3844 cmd_ctx
->llm
= NULL
;
3845 cmd_ctx
->session
= NULL
;
3847 health_code_update();
3850 * Data is received from the lttng client. The struct
3851 * lttcomm_session_msg (lsm) contains the command and data request of
3854 DBG("Receiving data from client ...");
3855 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3856 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3858 DBG("Nothing recv() from client... continuing");
3864 clean_command_ctx(&cmd_ctx
);
3868 health_code_update();
3870 // TODO: Validate cmd_ctx including sanity check for
3871 // security purpose.
3873 rcu_thread_online();
3875 * This function dispatch the work to the kernel or userspace tracer
3876 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3877 * informations for the client. The command context struct contains
3878 * everything this function may needs.
3880 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3881 rcu_thread_offline();
3889 * TODO: Inform client somehow of the fatal error. At
3890 * this point, ret < 0 means that a zmalloc failed
3891 * (ENOMEM). Error detected but still accept
3892 * command, unless a socket error has been
3895 clean_command_ctx(&cmd_ctx
);
3899 health_code_update();
3901 DBG("Sending response (size: %d, retcode: %s)",
3902 cmd_ctx
->lttng_msg_size
,
3903 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3904 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3906 ERR("Failed to send data back to client");
3909 /* End of transmission */
3916 clean_command_ctx(&cmd_ctx
);
3918 health_code_update();
3930 lttng_poll_clean(&events
);
3931 clean_command_ctx(&cmd_ctx
);
3935 unlink(client_unix_sock_path
);
3936 if (client_sock
>= 0) {
3937 ret
= close(client_sock
);
3945 ERR("Health error occurred in %s", __func__
);
3948 health_unregister(health_sessiond
);
3950 DBG("Client thread dying");
3952 rcu_unregister_thread();
3958 * usage function on stderr
3960 static void usage(void)
3962 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3963 fprintf(stderr
, " -h, --help Display this usage.\n");
3964 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3965 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3966 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3967 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3968 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3969 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3970 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3971 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3972 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3973 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3974 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3975 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3976 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3977 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3978 fprintf(stderr
, " -V, --version Show version number.\n");
3979 fprintf(stderr
, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
3980 fprintf(stderr
, " -q, --quiet No output at all.\n");
3981 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3982 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3983 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3984 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3985 fprintf(stderr
, " --jul-tcp-port JUL application registration TCP port\n");
3989 * daemon argument parsing
3991 static int parse_args(int argc
, char **argv
)
3995 static struct option long_options
[] = {
3996 { "client-sock", 1, 0, 'c' },
3997 { "apps-sock", 1, 0, 'a' },
3998 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3999 { "kconsumerd-err-sock", 1, 0, 'E' },
4000 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
4001 { "ustconsumerd32-err-sock", 1, 0, 'H' },
4002 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
4003 { "ustconsumerd64-err-sock", 1, 0, 'F' },
4004 { "consumerd32-path", 1, 0, 'u' },
4005 { "consumerd32-libdir", 1, 0, 'U' },
4006 { "consumerd64-path", 1, 0, 't' },
4007 { "consumerd64-libdir", 1, 0, 'T' },
4008 { "daemonize", 0, 0, 'd' },
4009 { "sig-parent", 0, 0, 'S' },
4010 { "help", 0, 0, 'h' },
4011 { "group", 1, 0, 'g' },
4012 { "version", 0, 0, 'V' },
4013 { "quiet", 0, 0, 'q' },
4014 { "verbose", 0, 0, 'v' },
4015 { "verbose-consumer", 0, 0, 'Z' },
4016 { "no-kernel", 0, 0, 'N' },
4017 { "pidfile", 1, 0, 'p' },
4018 { "jul-tcp-port", 1, 0, 'J' },
4023 int option_index
= 0;
4024 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:J:",
4025 long_options
, &option_index
);
4032 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
4034 fprintf(stderr
, " with arg %s\n", optarg
);
4038 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4041 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4047 tracing_group_name
= optarg
;
4053 fprintf(stdout
, "%s\n", VERSION
);
4059 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4062 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4065 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4068 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4071 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4074 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4080 lttng_opt_quiet
= 1;
4083 /* Verbose level can increase using multiple -v */
4084 lttng_opt_verbose
+= 1;
4087 opt_verbose_consumer
+= 1;
4090 consumerd32_bin
= optarg
;
4093 consumerd32_libdir
= optarg
;
4096 consumerd64_bin
= optarg
;
4099 consumerd64_libdir
= optarg
;
4102 opt_pidfile
= optarg
;
4104 case 'J': /* JUL TCP port. */
4109 v
= strtoul(optarg
, NULL
, 0);
4110 if (errno
!= 0 || !isdigit(optarg
[0])) {
4111 ERR("Wrong value in --jul-tcp-port parameter: %s", optarg
);
4114 if (v
== 0 || v
>= 65535) {
4115 ERR("Port overflow in --jul-tcp-port parameter: %s", optarg
);
4118 jul_tcp_port
= (uint32_t) v
;
4119 DBG3("JUL TCP port set to non default: %u", jul_tcp_port
);
4123 /* Unknown option or other error.
4124 * Error is printed by getopt, just return */
4133 * Creates the two needed socket by the daemon.
4134 * apps_sock - The communication socket for all UST apps.
4135 * client_sock - The communication of the cli tool (lttng).
4137 static int init_daemon_socket(void)
4142 old_umask
= umask(0);
4144 /* Create client tool unix socket */
4145 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4146 if (client_sock
< 0) {
4147 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4152 /* Set the cloexec flag */
4153 ret
= utils_set_fd_cloexec(client_sock
);
4155 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4156 "Continuing but note that the consumer daemon will have a "
4157 "reference to this socket on exec()", client_sock
);
4160 /* File permission MUST be 660 */
4161 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4163 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4168 /* Create the application unix socket */
4169 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4170 if (apps_sock
< 0) {
4171 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4176 /* Set the cloexec flag */
4177 ret
= utils_set_fd_cloexec(apps_sock
);
4179 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4180 "Continuing but note that the consumer daemon will have a "
4181 "reference to this socket on exec()", apps_sock
);
4184 /* File permission MUST be 666 */
4185 ret
= chmod(apps_unix_sock_path
,
4186 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4188 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4193 DBG3("Session daemon client socket %d and application socket %d created",
4194 client_sock
, apps_sock
);
4202 * Check if the global socket is available, and if a daemon is answering at the
4203 * other side. If yes, error is returned.
4205 static int check_existing_daemon(void)
4207 /* Is there anybody out there ? */
4208 if (lttng_session_daemon_alive()) {
4216 * Set the tracing group gid onto the client socket.
4218 * Race window between mkdir and chown is OK because we are going from more
4219 * permissive (root.root) to less permissive (root.tracing).
4221 static int set_permissions(char *rundir
)
4226 gid
= utils_get_group_id(tracing_group_name
);
4228 /* Set lttng run dir */
4229 ret
= chown(rundir
, 0, gid
);
4231 ERR("Unable to set group on %s", rundir
);
4236 * Ensure all applications and tracing group can search the run
4237 * dir. Allow everyone to read the directory, since it does not
4238 * buy us anything to hide its content.
4240 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
4242 ERR("Unable to set permissions on %s", rundir
);
4246 /* lttng client socket path */
4247 ret
= chown(client_unix_sock_path
, 0, gid
);
4249 ERR("Unable to set group on %s", client_unix_sock_path
);
4253 /* kconsumer error socket path */
4254 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
4256 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4260 /* 64-bit ustconsumer error socket path */
4261 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
4263 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4267 /* 32-bit ustconsumer compat32 error socket path */
4268 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
4270 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4274 DBG("All permissions are set");
4280 * Create the lttng run directory needed for all global sockets and pipe.
4282 static int create_lttng_rundir(const char *rundir
)
4286 DBG3("Creating LTTng run directory: %s", rundir
);
4288 ret
= mkdir(rundir
, S_IRWXU
);
4290 if (errno
!= EEXIST
) {
4291 ERR("Unable to create %s", rundir
);
4303 * Setup sockets and directory needed by the kconsumerd communication with the
4306 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4310 char path
[PATH_MAX
];
4312 switch (consumer_data
->type
) {
4313 case LTTNG_CONSUMER_KERNEL
:
4314 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4316 case LTTNG_CONSUMER64_UST
:
4317 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4319 case LTTNG_CONSUMER32_UST
:
4320 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4323 ERR("Consumer type unknown");
4328 DBG2("Creating consumer directory: %s", path
);
4330 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
4332 if (errno
!= EEXIST
) {
4334 ERR("Failed to create %s", path
);
4340 ret
= chown(path
, 0, utils_get_group_id(tracing_group_name
));
4342 ERR("Unable to set group on %s", path
);
4348 /* Create the kconsumerd error unix socket */
4349 consumer_data
->err_sock
=
4350 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4351 if (consumer_data
->err_sock
< 0) {
4352 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4358 * Set the CLOEXEC flag. Return code is useless because either way, the
4361 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
4363 PERROR("utils_set_fd_cloexec");
4364 /* continue anyway */
4367 /* File permission MUST be 660 */
4368 ret
= chmod(consumer_data
->err_unix_sock_path
,
4369 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4371 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4381 * Signal handler for the daemon
4383 * Simply stop all worker threads, leaving main() return gracefully after
4384 * joining all threads and calling cleanup().
4386 static void sighandler(int sig
)
4390 DBG("SIGPIPE caught");
4393 DBG("SIGINT caught");
4397 DBG("SIGTERM caught");
4401 CMM_STORE_SHARED(recv_child_signal
, 1);
4409 * Setup signal handler for :
4410 * SIGINT, SIGTERM, SIGPIPE
4412 static int set_signal_handler(void)
4415 struct sigaction sa
;
4418 if ((ret
= sigemptyset(&sigset
)) < 0) {
4419 PERROR("sigemptyset");
4423 sa
.sa_handler
= sighandler
;
4424 sa
.sa_mask
= sigset
;
4426 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4427 PERROR("sigaction");
4431 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4432 PERROR("sigaction");
4436 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4437 PERROR("sigaction");
4441 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
4442 PERROR("sigaction");
4446 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
4452 * Set open files limit to unlimited. This daemon can open a large number of
4453 * file descriptors in order to consumer multiple kernel traces.
4455 static void set_ulimit(void)
4460 /* The kernel does not allowed an infinite limit for open files */
4461 lim
.rlim_cur
= 65535;
4462 lim
.rlim_max
= 65535;
4464 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4466 PERROR("failed to set open files limit");
4471 * Write pidfile using the rundir and opt_pidfile.
4473 static void write_pidfile(void)
4476 char pidfile_path
[PATH_MAX
];
4481 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
4483 /* Build pidfile path from rundir and opt_pidfile. */
4484 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
4485 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
4487 PERROR("snprintf pidfile path");
4493 * Create pid file in rundir. Return value is of no importance. The
4494 * execution will continue even though we are not able to write the file.
4496 (void) utils_create_pid_file(getpid(), pidfile_path
);
4503 * Write JUL TCP port using the rundir.
4505 static void write_julport(void)
4508 char path
[PATH_MAX
];
4512 ret
= snprintf(path
, sizeof(path
), "%s/"
4513 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE
, rundir
);
4515 PERROR("snprintf julport path");
4520 * Create TCP JUL port file in rundir. Return value is of no importance.
4521 * The execution will continue even though we are not able to write the
4524 (void) utils_create_pid_file(jul_tcp_port
, path
);
4533 int main(int argc
, char **argv
)
4537 const char *home_path
, *env_app_timeout
;
4539 init_kernel_workarounds();
4541 rcu_register_thread();
4543 if ((ret
= set_signal_handler()) < 0) {
4547 setup_consumerd_path();
4549 page_size
= sysconf(_SC_PAGESIZE
);
4550 if (page_size
< 0) {
4551 PERROR("sysconf _SC_PAGESIZE");
4552 page_size
= LONG_MAX
;
4553 WARN("Fallback page size to %ld", page_size
);
4556 /* Parse arguments */
4558 if ((ret
= parse_args(argc
, argv
)) < 0) {
4566 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
, 1);
4572 * We are in the child. Make sure all other file descriptors are
4573 * closed, in case we are called with more opened file descriptors than
4574 * the standard ones.
4576 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
4581 /* Create thread quit pipe */
4582 if ((ret
= init_thread_quit_pipe()) < 0) {
4586 /* Check if daemon is UID = 0 */
4587 is_root
= !getuid();
4590 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4592 /* Create global run dir with root access */
4593 ret
= create_lttng_rundir(rundir
);
4598 if (strlen(apps_unix_sock_path
) == 0) {
4599 snprintf(apps_unix_sock_path
, PATH_MAX
,
4600 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4603 if (strlen(client_unix_sock_path
) == 0) {
4604 snprintf(client_unix_sock_path
, PATH_MAX
,
4605 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4608 /* Set global SHM for ust */
4609 if (strlen(wait_shm_path
) == 0) {
4610 snprintf(wait_shm_path
, PATH_MAX
,
4611 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4614 if (strlen(health_unix_sock_path
) == 0) {
4615 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4616 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
4619 /* Setup kernel consumerd path */
4620 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4621 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4622 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4623 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4625 DBG2("Kernel consumer err path: %s",
4626 kconsumer_data
.err_unix_sock_path
);
4627 DBG2("Kernel consumer cmd path: %s",
4628 kconsumer_data
.cmd_unix_sock_path
);
4630 home_path
= utils_get_home_dir();
4631 if (home_path
== NULL
) {
4632 /* TODO: Add --socket PATH option */
4633 ERR("Can't get HOME directory for sockets creation.");
4639 * Create rundir from home path. This will create something like
4642 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4648 ret
= create_lttng_rundir(rundir
);
4653 if (strlen(apps_unix_sock_path
) == 0) {
4654 snprintf(apps_unix_sock_path
, PATH_MAX
,
4655 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4658 /* Set the cli tool unix socket path */
4659 if (strlen(client_unix_sock_path
) == 0) {
4660 snprintf(client_unix_sock_path
, PATH_MAX
,
4661 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4664 /* Set global SHM for ust */
4665 if (strlen(wait_shm_path
) == 0) {
4666 snprintf(wait_shm_path
, PATH_MAX
,
4667 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
4670 /* Set health check Unix path */
4671 if (strlen(health_unix_sock_path
) == 0) {
4672 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4673 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4677 /* Set consumer initial state */
4678 kernel_consumerd_state
= CONSUMER_STOPPED
;
4679 ust_consumerd_state
= CONSUMER_STOPPED
;
4681 DBG("Client socket path %s", client_unix_sock_path
);
4682 DBG("Application socket path %s", apps_unix_sock_path
);
4683 DBG("Application wait path %s", wait_shm_path
);
4684 DBG("LTTng run directory path: %s", rundir
);
4686 /* 32 bits consumerd path setup */
4687 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4688 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4689 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4690 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4692 DBG2("UST consumer 32 bits err path: %s",
4693 ustconsumer32_data
.err_unix_sock_path
);
4694 DBG2("UST consumer 32 bits cmd path: %s",
4695 ustconsumer32_data
.cmd_unix_sock_path
);
4697 /* 64 bits consumerd path setup */
4698 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4699 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4700 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4701 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4703 DBG2("UST consumer 64 bits err path: %s",
4704 ustconsumer64_data
.err_unix_sock_path
);
4705 DBG2("UST consumer 64 bits cmd path: %s",
4706 ustconsumer64_data
.cmd_unix_sock_path
);
4709 * See if daemon already exist.
4711 if ((ret
= check_existing_daemon()) < 0) {
4712 ERR("Already running daemon.\n");
4714 * We do not goto exit because we must not cleanup()
4715 * because a daemon is already running.
4721 * Init UST app hash table. Alloc hash table before this point since
4722 * cleanup() can get called after that point.
4726 /* Initialize JUL domain subsystem. */
4727 if ((ret
= jul_init()) < 0) {
4728 /* ENOMEM at this point. */
4732 /* After this point, we can safely call cleanup() with "goto exit" */
4735 * These actions must be executed as root. We do that *after* setting up
4736 * the sockets path because we MUST make the check for another daemon using
4737 * those paths *before* trying to set the kernel consumer sockets and init
4741 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4746 /* Setup kernel tracer */
4747 if (!opt_no_kernel
) {
4748 init_kernel_tracer();
4751 /* Set ulimit for open files */
4754 /* init lttng_fd tracking must be done after set_ulimit. */
4757 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4762 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4767 /* Setup the needed unix socket */
4768 if ((ret
= init_daemon_socket()) < 0) {
4772 /* Set credentials to socket */
4773 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4777 /* Get parent pid if -S, --sig-parent is specified. */
4778 if (opt_sig_parent
) {
4782 /* Setup the kernel pipe for waking up the kernel thread */
4783 if (is_root
&& !opt_no_kernel
) {
4784 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4789 /* Setup the thread ht_cleanup communication pipe. */
4790 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
4794 /* Setup the thread apps communication pipe. */
4795 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4799 /* Setup the thread apps notify communication pipe. */
4800 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
4804 /* Initialize global buffer per UID and PID registry. */
4805 buffer_reg_init_uid_registry();
4806 buffer_reg_init_pid_registry();
4808 /* Init UST command queue. */
4809 cds_wfq_init(&ust_cmd_queue
.queue
);
4812 * Get session list pointer. This pointer MUST NOT be free(). This list is
4813 * statically declared in session.c
4815 session_list_ptr
= session_get_list();
4817 /* Set up max poll set size */
4818 lttng_poll_set_max_size();
4822 /* Check for the application socket timeout env variable. */
4823 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4824 if (env_app_timeout
) {
4825 app_socket_timeout
= atoi(env_app_timeout
);
4827 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4833 /* Initialize communication library */
4835 /* This is to get the TCP timeout value. */
4836 lttcomm_inet_init();
4839 * Initialize the health check subsystem. This call should set the
4840 * appropriate time values.
4842 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
4843 if (!health_sessiond
) {
4844 PERROR("health_app_create error");
4845 goto exit_health_sessiond_cleanup
;
4848 /* Create thread to clean up RCU hash tables */
4849 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
4850 thread_ht_cleanup
, (void *) NULL
);
4852 PERROR("pthread_create ht_cleanup");
4853 goto exit_ht_cleanup
;
4856 /* Create health-check thread */
4857 ret
= pthread_create(&health_thread
, NULL
,
4858 thread_manage_health
, (void *) NULL
);
4860 PERROR("pthread_create health");
4864 /* Create thread to manage the client socket */
4865 ret
= pthread_create(&client_thread
, NULL
,
4866 thread_manage_clients
, (void *) NULL
);
4868 PERROR("pthread_create clients");
4872 /* Create thread to dispatch registration */
4873 ret
= pthread_create(&dispatch_thread
, NULL
,
4874 thread_dispatch_ust_registration
, (void *) NULL
);
4876 PERROR("pthread_create dispatch");
4880 /* Create thread to manage application registration. */
4881 ret
= pthread_create(®_apps_thread
, NULL
,
4882 thread_registration_apps
, (void *) NULL
);
4884 PERROR("pthread_create registration");
4888 /* Create thread to manage application socket */
4889 ret
= pthread_create(&apps_thread
, NULL
,
4890 thread_manage_apps
, (void *) NULL
);
4892 PERROR("pthread_create apps");
4896 /* Create thread to manage application notify socket */
4897 ret
= pthread_create(&apps_notify_thread
, NULL
,
4898 ust_thread_manage_notify
, (void *) NULL
);
4900 PERROR("pthread_create apps");
4901 goto exit_apps_notify
;
4904 /* Create JUL registration thread. */
4905 ret
= pthread_create(&jul_reg_thread
, NULL
,
4906 jul_thread_manage_registration
, (void *) NULL
);
4908 PERROR("pthread_create apps");
4912 /* Don't start this thread if kernel tracing is not requested nor root */
4913 if (is_root
&& !opt_no_kernel
) {
4914 /* Create kernel thread to manage kernel event */
4915 ret
= pthread_create(&kernel_thread
, NULL
,
4916 thread_manage_kernel
, (void *) NULL
);
4918 PERROR("pthread_create kernel");
4922 ret
= pthread_join(kernel_thread
, &status
);
4924 PERROR("pthread_join");
4925 goto error
; /* join error, exit without cleanup */
4930 ret
= pthread_join(jul_reg_thread
, &status
);
4932 PERROR("pthread_join JUL");
4933 goto error
; /* join error, exit without cleanup */
4937 ret
= pthread_join(apps_notify_thread
, &status
);
4939 PERROR("pthread_join apps notify");
4940 goto error
; /* join error, exit without cleanup */
4944 ret
= pthread_join(apps_thread
, &status
);
4946 PERROR("pthread_join apps");
4947 goto error
; /* join error, exit without cleanup */
4952 ret
= pthread_join(reg_apps_thread
, &status
);
4954 PERROR("pthread_join");
4955 goto error
; /* join error, exit without cleanup */
4959 ret
= pthread_join(dispatch_thread
, &status
);
4961 PERROR("pthread_join");
4962 goto error
; /* join error, exit without cleanup */
4966 ret
= pthread_join(client_thread
, &status
);
4968 PERROR("pthread_join");
4969 goto error
; /* join error, exit without cleanup */
4972 ret
= join_consumer_thread(&kconsumer_data
);
4974 PERROR("join_consumer");
4975 goto error
; /* join error, exit without cleanup */
4978 ret
= join_consumer_thread(&ustconsumer32_data
);
4980 PERROR("join_consumer ust32");
4981 goto error
; /* join error, exit without cleanup */
4984 ret
= join_consumer_thread(&ustconsumer64_data
);
4986 PERROR("join_consumer ust64");
4987 goto error
; /* join error, exit without cleanup */
4991 ret
= pthread_join(health_thread
, &status
);
4993 PERROR("pthread_join health thread");
4994 goto error
; /* join error, exit without cleanup */
4998 ret
= pthread_join(ht_cleanup_thread
, &status
);
5000 PERROR("pthread_join ht cleanup thread");
5001 goto error
; /* join error, exit without cleanup */
5004 health_app_destroy(health_sessiond
);
5005 exit_health_sessiond_cleanup
:
5008 * cleanup() is called when no other thread is running.
5010 rcu_thread_online();
5012 rcu_thread_offline();
5013 rcu_unregister_thread();