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.
29 #include <sys/mount.h>
30 #include <sys/resource.h>
31 #include <sys/socket.h>
33 #include <sys/types.h>
35 #include <urcu/uatomic.h>
39 #include <common/common.h>
40 #include <common/compat/poll.h>
41 #include <common/compat/socket.h>
42 #include <common/defaults.h>
43 #include <common/kernel-consumer/kernel-consumer.h>
44 #include <common/futex.h>
45 #include <common/relayd/relayd.h>
46 #include <common/utils.h>
48 #include "lttng-sessiond.h"
55 #include "kernel-consumer.h"
59 #include "ust-consumer.h"
63 #include "testpoint.h"
65 #define CONSUMERD_FILE "lttng-consumerd"
68 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
69 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
70 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
71 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
74 const char *opt_tracing_group
;
75 static const char *opt_pidfile
;
76 static int opt_sig_parent
;
77 static int opt_verbose_consumer
;
78 static int opt_daemon
;
79 static int opt_no_kernel
;
80 static int is_root
; /* Set to 1 if the daemon is running as root */
81 static pid_t ppid
; /* Parent PID for --sig-parent option */
85 * Consumer daemon specific control data. Every value not initialized here is
86 * set to 0 by the static definition.
88 static struct consumer_data kconsumer_data
= {
89 .type
= LTTNG_CONSUMER_KERNEL
,
90 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
91 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
94 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
95 .lock
= PTHREAD_MUTEX_INITIALIZER
,
96 .cond
= PTHREAD_COND_INITIALIZER
,
97 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
99 static struct consumer_data ustconsumer64_data
= {
100 .type
= LTTNG_CONSUMER64_UST
,
101 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
102 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
105 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
106 .lock
= PTHREAD_MUTEX_INITIALIZER
,
107 .cond
= PTHREAD_COND_INITIALIZER
,
108 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
110 static struct consumer_data ustconsumer32_data
= {
111 .type
= LTTNG_CONSUMER32_UST
,
112 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
113 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
116 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
117 .lock
= PTHREAD_MUTEX_INITIALIZER
,
118 .cond
= PTHREAD_COND_INITIALIZER
,
119 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
122 /* Shared between threads */
123 static int dispatch_thread_exit
;
125 /* Global application Unix socket path */
126 static char apps_unix_sock_path
[PATH_MAX
];
127 /* Global client Unix socket path */
128 static char client_unix_sock_path
[PATH_MAX
];
129 /* global wait shm path for UST */
130 static char wait_shm_path
[PATH_MAX
];
131 /* Global health check unix path */
132 static char health_unix_sock_path
[PATH_MAX
];
134 /* Sockets and FDs */
135 static int client_sock
= -1;
136 static int apps_sock
= -1;
137 int kernel_tracer_fd
= -1;
138 static int kernel_poll_pipe
[2] = { -1, -1 };
141 * Quit pipe for all threads. This permits a single cancellation point
142 * for all threads when receiving an event on the pipe.
144 static int thread_quit_pipe
[2] = { -1, -1 };
147 * This pipe is used to inform the thread managing application communication
148 * that a command is queued and ready to be processed.
150 static int apps_cmd_pipe
[2] = { -1, -1 };
152 /* Pthread, Mutexes and Semaphores */
153 static pthread_t apps_thread
;
154 static pthread_t reg_apps_thread
;
155 static pthread_t client_thread
;
156 static pthread_t kernel_thread
;
157 static pthread_t dispatch_thread
;
158 static pthread_t health_thread
;
161 * UST registration command queue. This queue is tied with a futex and uses a N
162 * wakers / 1 waiter implemented and detailed in futex.c/.h
164 * The thread_manage_apps and thread_dispatch_ust_registration interact with
165 * this queue and the wait/wake scheme.
167 static struct ust_cmd_queue ust_cmd_queue
;
170 * Pointer initialized before thread creation.
172 * This points to the tracing session list containing the session count and a
173 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
174 * MUST NOT be taken if you call a public function in session.c.
176 * The lock is nested inside the structure: session_list_ptr->lock. Please use
177 * session_lock_list and session_unlock_list for lock acquisition.
179 static struct ltt_session_list
*session_list_ptr
;
181 int ust_consumerd64_fd
= -1;
182 int ust_consumerd32_fd
= -1;
184 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
185 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
186 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
187 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
189 static const char *module_proc_lttng
= "/proc/lttng";
192 * Consumer daemon state which is changed when spawning it, killing it or in
193 * case of a fatal error.
195 enum consumerd_state
{
196 CONSUMER_STARTED
= 1,
197 CONSUMER_STOPPED
= 2,
202 * This consumer daemon state is used to validate if a client command will be
203 * able to reach the consumer. If not, the client is informed. For instance,
204 * doing a "lttng start" when the consumer state is set to ERROR will return an
205 * error to the client.
207 * The following example shows a possible race condition of this scheme:
209 * consumer thread error happens
211 * client cmd checks state -> still OK
212 * consumer thread exit, sets error
213 * client cmd try to talk to consumer
216 * However, since the consumer is a different daemon, we have no way of making
217 * sure the command will reach it safely even with this state flag. This is why
218 * we consider that up to the state validation during command processing, the
219 * command is safe. After that, we can not guarantee the correctness of the
220 * client request vis-a-vis the consumer.
222 static enum consumerd_state ust_consumerd_state
;
223 static enum consumerd_state kernel_consumerd_state
;
225 /* Used for the health monitoring of the session daemon. See health.h */
226 struct health_state health_thread_cmd
;
227 struct health_state health_thread_app_manage
;
228 struct health_state health_thread_app_reg
;
229 struct health_state health_thread_kernel
;
232 * Socket timeout for receiving and sending in seconds.
234 static int app_socket_timeout
;
237 void setup_consumerd_path(void)
239 const char *bin
, *libdir
;
242 * Allow INSTALL_BIN_PATH to be used as a target path for the
243 * native architecture size consumer if CONFIG_CONSUMER*_PATH
244 * has not been defined.
246 #if (CAA_BITS_PER_LONG == 32)
247 if (!consumerd32_bin
[0]) {
248 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
250 if (!consumerd32_libdir
[0]) {
251 consumerd32_libdir
= INSTALL_LIB_PATH
;
253 #elif (CAA_BITS_PER_LONG == 64)
254 if (!consumerd64_bin
[0]) {
255 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
257 if (!consumerd64_libdir
[0]) {
258 consumerd64_libdir
= INSTALL_LIB_PATH
;
261 #error "Unknown bitness"
265 * runtime env. var. overrides the build default.
267 bin
= getenv("LTTNG_CONSUMERD32_BIN");
269 consumerd32_bin
= bin
;
271 bin
= getenv("LTTNG_CONSUMERD64_BIN");
273 consumerd64_bin
= bin
;
275 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
277 consumerd32_libdir
= libdir
;
279 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
281 consumerd64_libdir
= libdir
;
286 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
288 static int create_thread_poll_set(struct lttng_poll_event
*events
,
293 if (events
== NULL
|| size
== 0) {
298 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
304 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
316 * Check if the thread quit pipe was triggered.
318 * Return 1 if it was triggered else 0;
320 static int check_thread_quit_pipe(int fd
, uint32_t events
)
322 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
330 * Return group ID of the tracing group or -1 if not found.
332 static gid_t
allowed_group(void)
336 if (opt_tracing_group
) {
337 grp
= getgrnam(opt_tracing_group
);
339 grp
= getgrnam(default_tracing_group
);
349 * Init thread quit pipe.
351 * Return -1 on error or 0 if all pipes are created.
353 static int init_thread_quit_pipe(void)
357 ret
= pipe(thread_quit_pipe
);
359 PERROR("thread quit pipe");
363 for (i
= 0; i
< 2; i
++) {
364 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
376 * Stop all threads by closing the thread quit pipe.
378 static void stop_threads(void)
382 /* Stopping all threads */
383 DBG("Terminating all threads");
384 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
386 ERR("write error on thread quit pipe");
389 /* Dispatch thread */
390 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
391 futex_nto1_wake(&ust_cmd_queue
.futex
);
397 static void cleanup(void)
401 struct ltt_session
*sess
, *stmp
;
405 /* First thing first, stop all threads */
406 utils_close_pipe(thread_quit_pipe
);
409 * If opt_pidfile is undefined, the default file will be wiped when
410 * removing the rundir.
413 ret
= remove(opt_pidfile
);
415 PERROR("remove pidfile %s", opt_pidfile
);
419 DBG("Removing %s directory", rundir
);
420 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
422 ERR("asprintf failed. Something is really wrong!");
425 /* Remove lttng run directory */
428 ERR("Unable to clean %s", rundir
);
433 DBG("Cleaning up all sessions");
435 /* Destroy session list mutex */
436 if (session_list_ptr
!= NULL
) {
437 pthread_mutex_destroy(&session_list_ptr
->lock
);
439 /* Cleanup ALL session */
440 cds_list_for_each_entry_safe(sess
, stmp
,
441 &session_list_ptr
->head
, list
) {
442 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
446 DBG("Closing all UST sockets");
447 ust_app_clean_list();
449 if (is_root
&& !opt_no_kernel
) {
450 DBG2("Closing kernel fd");
451 if (kernel_tracer_fd
>= 0) {
452 ret
= close(kernel_tracer_fd
);
457 DBG("Unloading kernel modules");
458 modprobe_remove_lttng_all();
462 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
463 "Matthew, BEET driven development works!%c[%dm",
464 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
469 * Send data on a unix socket using the liblttsessiondcomm API.
471 * Return lttcomm error code.
473 static int send_unix_sock(int sock
, void *buf
, size_t len
)
475 /* Check valid length */
480 return lttcomm_send_unix_sock(sock
, buf
, len
);
484 * Free memory of a command context structure.
486 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
488 DBG("Clean command context structure");
490 if ((*cmd_ctx
)->llm
) {
491 free((*cmd_ctx
)->llm
);
493 if ((*cmd_ctx
)->lsm
) {
494 free((*cmd_ctx
)->lsm
);
502 * Notify UST applications using the shm mmap futex.
504 static int notify_ust_apps(int active
)
508 DBG("Notifying applications of session daemon state: %d", active
);
510 /* See shm.c for this call implying mmap, shm and futex calls */
511 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
512 if (wait_shm_mmap
== NULL
) {
516 /* Wake waiting process */
517 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
519 /* Apps notified successfully */
527 * Setup the outgoing data buffer for the response (llm) by allocating the
528 * right amount of memory and copying the original information from the lsm
531 * Return total size of the buffer pointed by buf.
533 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
539 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
540 if (cmd_ctx
->llm
== NULL
) {
546 /* Copy common data */
547 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
548 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
550 cmd_ctx
->llm
->data_size
= size
;
551 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
560 * Update the kernel poll set of all channel fd available over all tracing
561 * session. Add the wakeup pipe at the end of the set.
563 static int update_kernel_poll(struct lttng_poll_event
*events
)
566 struct ltt_session
*session
;
567 struct ltt_kernel_channel
*channel
;
569 DBG("Updating kernel poll set");
572 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
573 session_lock(session
);
574 if (session
->kernel_session
== NULL
) {
575 session_unlock(session
);
579 cds_list_for_each_entry(channel
,
580 &session
->kernel_session
->channel_list
.head
, list
) {
581 /* Add channel fd to the kernel poll set */
582 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
584 session_unlock(session
);
587 DBG("Channel fd %d added to kernel set", channel
->fd
);
589 session_unlock(session
);
591 session_unlock_list();
596 session_unlock_list();
601 * Find the channel fd from 'fd' over all tracing session. When found, check
602 * for new channel stream and send those stream fds to the kernel consumer.
604 * Useful for CPU hotplug feature.
606 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
609 struct ltt_session
*session
;
610 struct ltt_kernel_session
*ksess
;
611 struct ltt_kernel_channel
*channel
;
613 DBG("Updating kernel streams for channel fd %d", fd
);
616 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
617 session_lock(session
);
618 if (session
->kernel_session
== NULL
) {
619 session_unlock(session
);
622 ksess
= session
->kernel_session
;
624 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
625 if (channel
->fd
== fd
) {
626 DBG("Channel found, updating kernel streams");
627 ret
= kernel_open_channel_stream(channel
);
633 * Have we already sent fds to the consumer? If yes, it means
634 * that tracing is started so it is safe to send our updated
637 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
638 struct lttng_ht_iter iter
;
639 struct consumer_socket
*socket
;
642 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
643 &iter
.iter
, socket
, node
.node
) {
644 /* Code flow error */
645 assert(socket
->fd
>= 0);
647 pthread_mutex_lock(socket
->lock
);
648 ret
= kernel_consumer_send_channel_stream(socket
,
650 pthread_mutex_unlock(socket
->lock
);
661 session_unlock(session
);
663 session_unlock_list();
667 session_unlock(session
);
668 session_unlock_list();
673 * For each tracing session, update newly registered apps.
675 static void update_ust_app(int app_sock
)
677 struct ltt_session
*sess
, *stmp
;
681 /* For all tracing session(s) */
682 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
684 if (sess
->ust_session
) {
685 ust_app_global_update(sess
->ust_session
, app_sock
);
687 session_unlock(sess
);
690 session_unlock_list();
694 * This thread manage event coming from the kernel.
696 * Features supported in this thread:
699 static void *thread_manage_kernel(void *data
)
701 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
702 uint32_t revents
, nb_fd
;
704 struct lttng_poll_event events
;
706 DBG("[thread] Thread manage kernel started");
709 * This first step of the while is to clean this structure which could free
710 * non NULL pointers so zero it before the loop.
712 memset(&events
, 0, sizeof(events
));
714 if (testpoint(thread_manage_kernel
)) {
715 goto error_testpoint
;
718 health_code_update(&health_thread_kernel
);
720 if (testpoint(thread_manage_kernel_before_loop
)) {
721 goto error_testpoint
;
725 health_code_update(&health_thread_kernel
);
727 if (update_poll_flag
== 1) {
728 /* Clean events object. We are about to populate it again. */
729 lttng_poll_clean(&events
);
731 ret
= create_thread_poll_set(&events
, 2);
733 goto error_poll_create
;
736 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
741 /* This will add the available kernel channel if any. */
742 ret
= update_kernel_poll(&events
);
746 update_poll_flag
= 0;
749 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events
));
751 /* Poll infinite value of time */
753 health_poll_update(&health_thread_kernel
);
754 ret
= lttng_poll_wait(&events
, -1);
755 health_poll_update(&health_thread_kernel
);
758 * Restart interrupted system call.
760 if (errno
== EINTR
) {
764 } else if (ret
== 0) {
765 /* Should not happen since timeout is infinite */
766 ERR("Return value of poll is 0 with an infinite timeout.\n"
767 "This should not have happened! Continuing...");
773 for (i
= 0; i
< nb_fd
; i
++) {
774 /* Fetch once the poll data */
775 revents
= LTTNG_POLL_GETEV(&events
, i
);
776 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
778 health_code_update(&health_thread_kernel
);
780 /* Thread quit pipe has been closed. Killing thread. */
781 ret
= check_thread_quit_pipe(pollfd
, revents
);
787 /* Check for data on kernel pipe */
788 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
790 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
791 } while (ret
< 0 && errno
== EINTR
);
793 * Ret value is useless here, if this pipe gets any actions an
794 * update is required anyway.
796 update_poll_flag
= 1;
800 * New CPU detected by the kernel. Adding kernel stream to
801 * kernel session and updating the kernel consumer
803 if (revents
& LPOLLIN
) {
804 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
810 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
811 * and unregister kernel stream at this point.
820 lttng_poll_clean(&events
);
823 utils_close_pipe(kernel_poll_pipe
);
824 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
826 health_error(&health_thread_kernel
);
827 ERR("Health error occurred in %s", __func__
);
828 WARN("Kernel thread died unexpectedly. "
829 "Kernel tracing can continue but CPU hotplug is disabled.");
831 health_exit(&health_thread_kernel
);
832 DBG("Kernel thread dying");
837 * Signal pthread condition of the consumer data that the thread.
839 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
841 pthread_mutex_lock(&data
->cond_mutex
);
844 * The state is set before signaling. It can be any value, it's the waiter
845 * job to correctly interpret this condition variable associated to the
846 * consumer pthread_cond.
848 * A value of 0 means that the corresponding thread of the consumer data
849 * was not started. 1 indicates that the thread has started and is ready
850 * for action. A negative value means that there was an error during the
853 data
->consumer_thread_is_ready
= state
;
854 (void) pthread_cond_signal(&data
->cond
);
856 pthread_mutex_unlock(&data
->cond_mutex
);
860 * This thread manage the consumer error sent back to the session daemon.
862 static void *thread_manage_consumer(void *data
)
864 int sock
= -1, i
, ret
, pollfd
, err
= -1;
865 uint32_t revents
, nb_fd
;
866 enum lttcomm_return_code code
;
867 struct lttng_poll_event events
;
868 struct consumer_data
*consumer_data
= data
;
870 DBG("[thread] Manage consumer started");
873 * Since the consumer thread can be spawned at any moment in time, we init
874 * the health to a poll status (1, which is a valid health over time).
875 * When the thread starts, we update here the health to a "code" path being
876 * an even value so this thread, when reaching a poll wait, does not
877 * trigger an error with an even value.
879 * Here is the use case we avoid.
881 * +1: the first poll update during initialization (main())
882 * +2 * x: multiple code update once in this thread.
883 * +1: poll wait in this thread (being a good health state).
884 * == even number which after the wait period shows as a bad health.
886 * In a nutshell, the following poll update to the health state brings back
887 * the state to an even value meaning a code path.
889 health_poll_update(&consumer_data
->health
);
892 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
893 * Nothing more will be added to this poll set.
895 ret
= create_thread_poll_set(&events
, 2);
901 * The error socket here is already in a listening state which was done
902 * just before spawning this thread to avoid a race between the consumer
903 * daemon exec trying to connect and the listen() call.
905 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
910 health_code_update(&consumer_data
->health
);
912 /* Inifinite blocking call, waiting for transmission */
914 health_poll_update(&consumer_data
->health
);
916 if (testpoint(thread_manage_consumer
)) {
920 ret
= lttng_poll_wait(&events
, -1);
921 health_poll_update(&consumer_data
->health
);
924 * Restart interrupted system call.
926 if (errno
== EINTR
) {
934 for (i
= 0; i
< nb_fd
; i
++) {
935 /* Fetch once the poll data */
936 revents
= LTTNG_POLL_GETEV(&events
, i
);
937 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
939 health_code_update(&consumer_data
->health
);
941 /* Thread quit pipe has been closed. Killing thread. */
942 ret
= check_thread_quit_pipe(pollfd
, revents
);
948 /* Event on the registration socket */
949 if (pollfd
== consumer_data
->err_sock
) {
950 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
951 ERR("consumer err socket poll error");
957 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
963 * Set the CLOEXEC flag. Return code is useless because either way, the
966 (void) utils_set_fd_cloexec(sock
);
968 health_code_update(&consumer_data
->health
);
970 DBG2("Receiving code from consumer err_sock");
972 /* Getting status code from kconsumerd */
973 ret
= lttcomm_recv_unix_sock(sock
, &code
,
974 sizeof(enum lttcomm_return_code
));
979 health_code_update(&consumer_data
->health
);
981 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
982 consumer_data
->cmd_sock
=
983 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
984 if (consumer_data
->cmd_sock
< 0) {
985 /* On error, signal condition and quit. */
986 signal_consumer_condition(consumer_data
, -1);
987 PERROR("consumer connect");
990 signal_consumer_condition(consumer_data
, 1);
991 DBG("Consumer command socket ready");
993 ERR("consumer error when waiting for SOCK_READY : %s",
994 lttcomm_get_readable_code(-code
));
998 /* Remove the kconsumerd error sock since we've established a connexion */
999 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1004 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1009 health_code_update(&consumer_data
->health
);
1011 /* Inifinite blocking call, waiting for transmission */
1013 health_poll_update(&consumer_data
->health
);
1014 ret
= lttng_poll_wait(&events
, -1);
1015 health_poll_update(&consumer_data
->health
);
1018 * Restart interrupted system call.
1020 if (errno
== EINTR
) {
1028 for (i
= 0; i
< nb_fd
; i
++) {
1029 /* Fetch once the poll data */
1030 revents
= LTTNG_POLL_GETEV(&events
, i
);
1031 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1033 health_code_update(&consumer_data
->health
);
1035 /* Thread quit pipe has been closed. Killing thread. */
1036 ret
= check_thread_quit_pipe(pollfd
, revents
);
1042 /* Event on the kconsumerd socket */
1043 if (pollfd
== sock
) {
1044 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1045 ERR("consumer err socket second poll error");
1051 health_code_update(&consumer_data
->health
);
1053 /* Wait for any kconsumerd error */
1054 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1055 sizeof(enum lttcomm_return_code
));
1057 ERR("consumer closed the command socket");
1061 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1065 /* Immediately set the consumerd state to stopped */
1066 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1067 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1068 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1069 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1070 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1072 /* Code flow error... */
1076 if (consumer_data
->err_sock
>= 0) {
1077 ret
= close(consumer_data
->err_sock
);
1082 if (consumer_data
->cmd_sock
>= 0) {
1083 ret
= close(consumer_data
->cmd_sock
);
1095 unlink(consumer_data
->err_unix_sock_path
);
1096 unlink(consumer_data
->cmd_unix_sock_path
);
1097 consumer_data
->pid
= 0;
1099 lttng_poll_clean(&events
);
1102 health_error(&consumer_data
->health
);
1103 ERR("Health error occurred in %s", __func__
);
1105 health_exit(&consumer_data
->health
);
1106 DBG("consumer thread cleanup completed");
1112 * This thread manage application communication.
1114 static void *thread_manage_apps(void *data
)
1116 int i
, ret
, pollfd
, err
= -1;
1117 uint32_t revents
, nb_fd
;
1118 struct ust_command ust_cmd
;
1119 struct lttng_poll_event events
;
1121 DBG("[thread] Manage application started");
1123 rcu_register_thread();
1124 rcu_thread_online();
1126 if (testpoint(thread_manage_apps
)) {
1127 goto error_testpoint
;
1130 health_code_update(&health_thread_app_manage
);
1132 ret
= create_thread_poll_set(&events
, 2);
1134 goto error_poll_create
;
1137 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1142 if (testpoint(thread_manage_apps_before_loop
)) {
1146 health_code_update(&health_thread_app_manage
);
1149 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events
));
1151 /* Inifinite blocking call, waiting for transmission */
1153 health_poll_update(&health_thread_app_manage
);
1154 ret
= lttng_poll_wait(&events
, -1);
1155 health_poll_update(&health_thread_app_manage
);
1158 * Restart interrupted system call.
1160 if (errno
== EINTR
) {
1168 for (i
= 0; i
< nb_fd
; i
++) {
1169 /* Fetch once the poll data */
1170 revents
= LTTNG_POLL_GETEV(&events
, i
);
1171 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1173 health_code_update(&health_thread_app_manage
);
1175 /* Thread quit pipe has been closed. Killing thread. */
1176 ret
= check_thread_quit_pipe(pollfd
, revents
);
1182 /* Inspect the apps cmd pipe */
1183 if (pollfd
== apps_cmd_pipe
[0]) {
1184 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1185 ERR("Apps command pipe error");
1187 } else if (revents
& LPOLLIN
) {
1190 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1191 } while (ret
< 0 && errno
== EINTR
);
1192 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1193 PERROR("read apps cmd pipe");
1197 health_code_update(&health_thread_app_manage
);
1199 /* Register applicaton to the session daemon */
1200 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1202 if (ret
== -ENOMEM
) {
1204 } else if (ret
< 0) {
1208 health_code_update(&health_thread_app_manage
);
1211 * Validate UST version compatibility.
1213 ret
= ust_app_validate_version(ust_cmd
.sock
);
1216 * Add channel(s) and event(s) to newly registered apps
1217 * from lttng global UST domain.
1219 update_ust_app(ust_cmd
.sock
);
1222 health_code_update(&health_thread_app_manage
);
1224 ret
= ust_app_register_done(ust_cmd
.sock
);
1227 * If the registration is not possible, we simply
1228 * unregister the apps and continue
1230 ust_app_unregister(ust_cmd
.sock
);
1233 * We only monitor the error events of the socket. This
1234 * thread does not handle any incoming data from UST
1237 ret
= lttng_poll_add(&events
, ust_cmd
.sock
,
1238 LPOLLERR
& LPOLLHUP
& LPOLLRDHUP
);
1243 /* Set socket timeout for both receiving and ending */
1244 (void) lttcomm_setsockopt_rcv_timeout(ust_cmd
.sock
,
1245 app_socket_timeout
);
1246 (void) lttcomm_setsockopt_snd_timeout(ust_cmd
.sock
,
1247 app_socket_timeout
);
1249 DBG("Apps with sock %d added to poll set",
1253 health_code_update(&health_thread_app_manage
);
1259 * At this point, we know that a registered application made
1260 * the event at poll_wait.
1262 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1263 /* Removing from the poll set */
1264 ret
= lttng_poll_del(&events
, pollfd
);
1269 /* Socket closed on remote end. */
1270 ust_app_unregister(pollfd
);
1275 health_code_update(&health_thread_app_manage
);
1281 lttng_poll_clean(&events
);
1284 utils_close_pipe(apps_cmd_pipe
);
1285 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1288 * We don't clean the UST app hash table here since already registered
1289 * applications can still be controlled so let them be until the session
1290 * daemon dies or the applications stop.
1294 health_error(&health_thread_app_manage
);
1295 ERR("Health error occurred in %s", __func__
);
1297 health_exit(&health_thread_app_manage
);
1298 DBG("Application communication apps thread cleanup complete");
1299 rcu_thread_offline();
1300 rcu_unregister_thread();
1305 * Dispatch request from the registration threads to the application
1306 * communication thread.
1308 static void *thread_dispatch_ust_registration(void *data
)
1311 struct cds_wfq_node
*node
;
1312 struct ust_command
*ust_cmd
= NULL
;
1314 DBG("[thread] Dispatch UST command started");
1316 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1317 /* Atomically prepare the queue futex */
1318 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1321 /* Dequeue command for registration */
1322 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1324 DBG("Woken up but nothing in the UST command queue");
1325 /* Continue thread execution */
1329 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1331 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1332 " gid:%d sock:%d name:%s (version %d.%d)",
1333 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1334 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1335 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1336 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1338 * Inform apps thread of the new application registration. This
1339 * call is blocking so we can be assured that the data will be read
1340 * at some point in time or wait to the end of the world :)
1342 if (apps_cmd_pipe
[1] >= 0) {
1344 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1345 sizeof(struct ust_command
));
1346 } while (ret
< 0 && errno
== EINTR
);
1347 if (ret
< 0 || ret
!= sizeof(struct ust_command
)) {
1348 PERROR("write apps cmd pipe");
1349 if (errno
== EBADF
) {
1351 * We can't inform the application thread to process
1352 * registration. We will exit or else application
1353 * registration will not occur and tracing will never
1360 /* Application manager thread is not available. */
1361 ret
= close(ust_cmd
->sock
);
1363 PERROR("close ust_cmd sock");
1367 } while (node
!= NULL
);
1369 /* Futex wait on queue. Blocking call on futex() */
1370 futex_nto1_wait(&ust_cmd_queue
.futex
);
1374 DBG("Dispatch thread dying");
1379 * This thread manage application registration.
1381 static void *thread_registration_apps(void *data
)
1383 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1384 uint32_t revents
, nb_fd
;
1385 struct lttng_poll_event events
;
1387 * Get allocated in this thread, enqueued to a global queue, dequeued and
1388 * freed in the manage apps thread.
1390 struct ust_command
*ust_cmd
= NULL
;
1392 DBG("[thread] Manage application registration started");
1394 if (testpoint(thread_registration_apps
)) {
1395 goto error_testpoint
;
1398 ret
= lttcomm_listen_unix_sock(apps_sock
);
1404 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1405 * more will be added to this poll set.
1407 ret
= create_thread_poll_set(&events
, 2);
1409 goto error_create_poll
;
1412 /* Add the application registration socket */
1413 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1415 goto error_poll_add
;
1418 /* Notify all applications to register */
1419 ret
= notify_ust_apps(1);
1421 ERR("Failed to notify applications or create the wait shared memory.\n"
1422 "Execution continues but there might be problem for already\n"
1423 "running applications that wishes to register.");
1427 DBG("Accepting application registration");
1429 /* Inifinite blocking call, waiting for transmission */
1431 health_poll_update(&health_thread_app_reg
);
1432 ret
= lttng_poll_wait(&events
, -1);
1433 health_poll_update(&health_thread_app_reg
);
1436 * Restart interrupted system call.
1438 if (errno
== EINTR
) {
1446 for (i
= 0; i
< nb_fd
; i
++) {
1447 health_code_update(&health_thread_app_reg
);
1449 /* Fetch once the poll data */
1450 revents
= LTTNG_POLL_GETEV(&events
, i
);
1451 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1453 /* Thread quit pipe has been closed. Killing thread. */
1454 ret
= check_thread_quit_pipe(pollfd
, revents
);
1460 /* Event on the registration socket */
1461 if (pollfd
== apps_sock
) {
1462 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1463 ERR("Register apps socket poll error");
1465 } else if (revents
& LPOLLIN
) {
1466 sock
= lttcomm_accept_unix_sock(apps_sock
);
1472 * Set the CLOEXEC flag. Return code is useless because
1473 * either way, the show must go on.
1475 (void) utils_set_fd_cloexec(sock
);
1477 /* Create UST registration command for enqueuing */
1478 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1479 if (ust_cmd
== NULL
) {
1480 PERROR("ust command zmalloc");
1485 * Using message-based transmissions to ensure we don't
1486 * have to deal with partially received messages.
1488 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1490 ERR("Exhausted file descriptors allowed for applications.");
1499 health_code_update(&health_thread_app_reg
);
1500 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1501 sizeof(struct ust_register_msg
));
1502 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1504 PERROR("lttcomm_recv_unix_sock register apps");
1506 ERR("Wrong size received on apps register");
1513 lttng_fd_put(LTTNG_FD_APPS
, 1);
1517 health_code_update(&health_thread_app_reg
);
1519 ust_cmd
->sock
= sock
;
1522 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1523 " gid:%d sock:%d name:%s (version %d.%d)",
1524 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1525 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1526 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1527 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1530 * Lock free enqueue the registration request. The red pill
1531 * has been taken! This apps will be part of the *system*.
1533 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1536 * Wake the registration queue futex. Implicit memory
1537 * barrier with the exchange in cds_wfq_enqueue.
1539 futex_nto1_wake(&ust_cmd_queue
.futex
);
1548 health_error(&health_thread_app_reg
);
1549 ERR("Health error occurred in %s", __func__
);
1552 /* Notify that the registration thread is gone */
1555 if (apps_sock
>= 0) {
1556 ret
= close(apps_sock
);
1566 lttng_fd_put(LTTNG_FD_APPS
, 1);
1568 unlink(apps_unix_sock_path
);
1571 lttng_poll_clean(&events
);
1575 DBG("UST Registration thread cleanup complete");
1576 health_exit(&health_thread_app_reg
);
1582 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1583 * exec or it will fails.
1585 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1588 struct timespec timeout
;
1590 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1591 consumer_data
->consumer_thread_is_ready
= 0;
1593 /* Setup pthread condition */
1594 ret
= pthread_condattr_init(&consumer_data
->condattr
);
1597 PERROR("pthread_condattr_init consumer data");
1602 * Set the monotonic clock in order to make sure we DO NOT jump in time
1603 * between the clock_gettime() call and the timedwait call. See bug #324
1604 * for a more details and how we noticed it.
1606 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
1609 PERROR("pthread_condattr_setclock consumer data");
1613 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
1616 PERROR("pthread_cond_init consumer data");
1620 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
1623 PERROR("pthread_create consumer");
1628 /* We are about to wait on a pthread condition */
1629 pthread_mutex_lock(&consumer_data
->cond_mutex
);
1631 /* Get time for sem_timedwait absolute timeout */
1632 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
1634 * Set the timeout for the condition timed wait even if the clock gettime
1635 * call fails since we might loop on that call and we want to avoid to
1636 * increment the timeout too many times.
1638 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1641 * The following loop COULD be skipped in some conditions so this is why we
1642 * set ret to 0 in order to make sure at least one round of the loop is
1648 * Loop until the condition is reached or when a timeout is reached. Note
1649 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1650 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1651 * possible. This loop does not take any chances and works with both of
1654 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
1655 if (clock_ret
< 0) {
1656 PERROR("clock_gettime spawn consumer");
1657 /* Infinite wait for the consumerd thread to be ready */
1658 ret
= pthread_cond_wait(&consumer_data
->cond
,
1659 &consumer_data
->cond_mutex
);
1661 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
1662 &consumer_data
->cond_mutex
, &timeout
);
1666 /* Release the pthread condition */
1667 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
1671 if (ret
== ETIMEDOUT
) {
1673 * Call has timed out so we kill the kconsumerd_thread and return
1676 ERR("Condition timed out. The consumer thread was never ready."
1678 ret
= pthread_cancel(consumer_data
->thread
);
1680 PERROR("pthread_cancel consumer thread");
1683 PERROR("pthread_cond_wait failed consumer thread");
1688 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1689 if (consumer_data
->pid
== 0) {
1690 ERR("Consumerd did not start");
1691 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1694 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1703 * Join consumer thread
1705 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1709 /* Consumer pid must be a real one. */
1710 if (consumer_data
->pid
> 0) {
1712 ret
= kill(consumer_data
->pid
, SIGTERM
);
1714 ERR("Error killing consumer daemon");
1717 return pthread_join(consumer_data
->thread
, &status
);
1724 * Fork and exec a consumer daemon (consumerd).
1726 * Return pid if successful else -1.
1728 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1732 const char *consumer_to_use
;
1733 const char *verbosity
;
1736 DBG("Spawning consumerd");
1743 if (opt_verbose_consumer
) {
1744 verbosity
= "--verbose";
1746 verbosity
= "--quiet";
1748 switch (consumer_data
->type
) {
1749 case LTTNG_CONSUMER_KERNEL
:
1751 * Find out which consumerd to execute. We will first try the
1752 * 64-bit path, then the sessiond's installation directory, and
1753 * fallback on the 32-bit one,
1755 DBG3("Looking for a kernel consumer at these locations:");
1756 DBG3(" 1) %s", consumerd64_bin
);
1757 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1758 DBG3(" 3) %s", consumerd32_bin
);
1759 if (stat(consumerd64_bin
, &st
) == 0) {
1760 DBG3("Found location #1");
1761 consumer_to_use
= consumerd64_bin
;
1762 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1763 DBG3("Found location #2");
1764 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1765 } else if (stat(consumerd32_bin
, &st
) == 0) {
1766 DBG3("Found location #3");
1767 consumer_to_use
= consumerd32_bin
;
1769 DBG("Could not find any valid consumerd executable");
1772 DBG("Using kernel consumer at: %s", consumer_to_use
);
1773 execl(consumer_to_use
,
1774 "lttng-consumerd", verbosity
, "-k",
1775 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1776 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1779 case LTTNG_CONSUMER64_UST
:
1781 char *tmpnew
= NULL
;
1783 if (consumerd64_libdir
[0] != '\0') {
1787 tmp
= getenv("LD_LIBRARY_PATH");
1791 tmplen
= strlen("LD_LIBRARY_PATH=")
1792 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1793 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1798 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1799 strcat(tmpnew
, consumerd64_libdir
);
1800 if (tmp
[0] != '\0') {
1801 strcat(tmpnew
, ":");
1802 strcat(tmpnew
, tmp
);
1804 ret
= putenv(tmpnew
);
1810 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1811 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1812 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1813 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1815 if (consumerd64_libdir
[0] != '\0') {
1823 case LTTNG_CONSUMER32_UST
:
1825 char *tmpnew
= NULL
;
1827 if (consumerd32_libdir
[0] != '\0') {
1831 tmp
= getenv("LD_LIBRARY_PATH");
1835 tmplen
= strlen("LD_LIBRARY_PATH=")
1836 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1837 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1842 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1843 strcat(tmpnew
, consumerd32_libdir
);
1844 if (tmp
[0] != '\0') {
1845 strcat(tmpnew
, ":");
1846 strcat(tmpnew
, tmp
);
1848 ret
= putenv(tmpnew
);
1854 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1855 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1856 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1857 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1859 if (consumerd32_libdir
[0] != '\0') {
1868 PERROR("unknown consumer type");
1872 PERROR("kernel start consumer exec");
1875 } else if (pid
> 0) {
1878 PERROR("start consumer fork");
1886 * Spawn the consumerd daemon and session daemon thread.
1888 static int start_consumerd(struct consumer_data
*consumer_data
)
1893 * Set the listen() state on the socket since there is a possible race
1894 * between the exec() of the consumer daemon and this call if place in the
1895 * consumer thread. See bug #366 for more details.
1897 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
1902 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1903 if (consumer_data
->pid
!= 0) {
1904 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1908 ret
= spawn_consumerd(consumer_data
);
1910 ERR("Spawning consumerd failed");
1911 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1915 /* Setting up the consumer_data pid */
1916 consumer_data
->pid
= ret
;
1917 DBG2("Consumer pid %d", consumer_data
->pid
);
1918 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1920 DBG2("Spawning consumer control thread");
1921 ret
= spawn_consumer_thread(consumer_data
);
1923 ERR("Fatal error spawning consumer control thread");
1931 /* Cleanup already created socket on error. */
1932 if (consumer_data
->err_sock
>= 0) {
1935 err
= close(consumer_data
->err_sock
);
1937 PERROR("close consumer data error socket");
1944 * Compute health status of each consumer. If one of them is zero (bad
1945 * state), we return 0.
1947 static int check_consumer_health(void)
1951 ret
= health_check_state(&kconsumer_data
.health
) &&
1952 health_check_state(&ustconsumer32_data
.health
) &&
1953 health_check_state(&ustconsumer64_data
.health
);
1955 DBG3("Health consumer check %d", ret
);
1961 * Setup necessary data for kernel tracer action.
1963 static int init_kernel_tracer(void)
1967 /* Modprobe lttng kernel modules */
1968 ret
= modprobe_lttng_control();
1973 /* Open debugfs lttng */
1974 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1975 if (kernel_tracer_fd
< 0) {
1976 DBG("Failed to open %s", module_proc_lttng
);
1981 /* Validate kernel version */
1982 ret
= kernel_validate_version(kernel_tracer_fd
);
1987 ret
= modprobe_lttng_data();
1992 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1996 modprobe_remove_lttng_control();
1997 ret
= close(kernel_tracer_fd
);
2001 kernel_tracer_fd
= -1;
2002 return LTTNG_ERR_KERN_VERSION
;
2005 ret
= close(kernel_tracer_fd
);
2011 modprobe_remove_lttng_control();
2014 WARN("No kernel tracer available");
2015 kernel_tracer_fd
= -1;
2017 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2019 return LTTNG_ERR_KERN_NA
;
2025 * Copy consumer output from the tracing session to the domain session. The
2026 * function also applies the right modification on a per domain basis for the
2027 * trace files destination directory.
2029 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2032 const char *dir_name
;
2033 struct consumer_output
*consumer
;
2036 assert(session
->consumer
);
2039 case LTTNG_DOMAIN_KERNEL
:
2040 DBG3("Copying tracing session consumer output in kernel session");
2042 * XXX: We should audit the session creation and what this function
2043 * does "extra" in order to avoid a destroy since this function is used
2044 * in the domain session creation (kernel and ust) only. Same for UST
2047 if (session
->kernel_session
->consumer
) {
2048 consumer_destroy_output(session
->kernel_session
->consumer
);
2050 session
->kernel_session
->consumer
=
2051 consumer_copy_output(session
->consumer
);
2052 /* Ease our life a bit for the next part */
2053 consumer
= session
->kernel_session
->consumer
;
2054 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2056 case LTTNG_DOMAIN_UST
:
2057 DBG3("Copying tracing session consumer output in UST session");
2058 if (session
->ust_session
->consumer
) {
2059 consumer_destroy_output(session
->ust_session
->consumer
);
2061 session
->ust_session
->consumer
=
2062 consumer_copy_output(session
->consumer
);
2063 /* Ease our life a bit for the next part */
2064 consumer
= session
->ust_session
->consumer
;
2065 dir_name
= DEFAULT_UST_TRACE_DIR
;
2068 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2072 /* Append correct directory to subdir */
2073 strncat(consumer
->subdir
, dir_name
,
2074 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2075 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2084 * Create an UST session and add it to the session ust list.
2086 static int create_ust_session(struct ltt_session
*session
,
2087 struct lttng_domain
*domain
)
2090 struct ltt_ust_session
*lus
= NULL
;
2094 assert(session
->consumer
);
2096 switch (domain
->type
) {
2097 case LTTNG_DOMAIN_UST
:
2100 ERR("Unknown UST domain on create session %d", domain
->type
);
2101 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2105 DBG("Creating UST session");
2107 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
2109 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2113 lus
->uid
= session
->uid
;
2114 lus
->gid
= session
->gid
;
2115 session
->ust_session
= lus
;
2117 /* Copy session output to the newly created UST session */
2118 ret
= copy_session_consumer(domain
->type
, session
);
2119 if (ret
!= LTTNG_OK
) {
2127 session
->ust_session
= NULL
;
2132 * Create a kernel tracer session then create the default channel.
2134 static int create_kernel_session(struct ltt_session
*session
)
2138 DBG("Creating kernel session");
2140 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2142 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2146 /* Code flow safety */
2147 assert(session
->kernel_session
);
2149 /* Copy session output to the newly created Kernel session */
2150 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2151 if (ret
!= LTTNG_OK
) {
2155 /* Create directory(ies) on local filesystem. */
2156 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2157 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2158 ret
= run_as_mkdir_recursive(
2159 session
->kernel_session
->consumer
->dst
.trace_path
,
2160 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2162 if (ret
!= -EEXIST
) {
2163 ERR("Trace directory creation error");
2169 session
->kernel_session
->uid
= session
->uid
;
2170 session
->kernel_session
->gid
= session
->gid
;
2175 trace_kernel_destroy_session(session
->kernel_session
);
2176 session
->kernel_session
= NULL
;
2181 * Count number of session permitted by uid/gid.
2183 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2186 struct ltt_session
*session
;
2188 DBG("Counting number of available session for UID %d GID %d",
2190 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2192 * Only list the sessions the user can control.
2194 if (!session_access_ok(session
, uid
, gid
)) {
2203 * Process the command requested by the lttng client within the command
2204 * context structure. This function make sure that the return structure (llm)
2205 * is set and ready for transmission before returning.
2207 * Return any error encountered or 0 for success.
2209 * "sock" is only used for special-case var. len data.
2211 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2215 int need_tracing_session
= 1;
2218 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2222 switch (cmd_ctx
->lsm
->cmd_type
) {
2223 case LTTNG_CREATE_SESSION
:
2224 case LTTNG_DESTROY_SESSION
:
2225 case LTTNG_LIST_SESSIONS
:
2226 case LTTNG_LIST_DOMAINS
:
2227 case LTTNG_START_TRACE
:
2228 case LTTNG_STOP_TRACE
:
2229 case LTTNG_DATA_PENDING
:
2236 if (opt_no_kernel
&& need_domain
2237 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2239 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2241 ret
= LTTNG_ERR_KERN_NA
;
2246 /* Deny register consumer if we already have a spawned consumer. */
2247 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2248 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2249 if (kconsumer_data
.pid
> 0) {
2250 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2251 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2254 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2258 * Check for command that don't needs to allocate a returned payload. We do
2259 * this here so we don't have to make the call for no payload at each
2262 switch(cmd_ctx
->lsm
->cmd_type
) {
2263 case LTTNG_LIST_SESSIONS
:
2264 case LTTNG_LIST_TRACEPOINTS
:
2265 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2266 case LTTNG_LIST_DOMAINS
:
2267 case LTTNG_LIST_CHANNELS
:
2268 case LTTNG_LIST_EVENTS
:
2271 /* Setup lttng message with no payload */
2272 ret
= setup_lttng_msg(cmd_ctx
, 0);
2274 /* This label does not try to unlock the session */
2275 goto init_setup_error
;
2279 /* Commands that DO NOT need a session. */
2280 switch (cmd_ctx
->lsm
->cmd_type
) {
2281 case LTTNG_CREATE_SESSION
:
2282 case LTTNG_CALIBRATE
:
2283 case LTTNG_LIST_SESSIONS
:
2284 case LTTNG_LIST_TRACEPOINTS
:
2285 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2286 need_tracing_session
= 0;
2289 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2291 * We keep the session list lock across _all_ commands
2292 * for now, because the per-session lock does not
2293 * handle teardown properly.
2295 session_lock_list();
2296 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2297 if (cmd_ctx
->session
== NULL
) {
2298 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2299 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2301 /* If no session name specified */
2302 ret
= LTTNG_ERR_SELECT_SESS
;
2306 /* Acquire lock for the session */
2307 session_lock(cmd_ctx
->session
);
2317 * Check domain type for specific "pre-action".
2319 switch (cmd_ctx
->lsm
->domain
.type
) {
2320 case LTTNG_DOMAIN_KERNEL
:
2322 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2326 /* Kernel tracer check */
2327 if (kernel_tracer_fd
== -1) {
2328 /* Basically, load kernel tracer modules */
2329 ret
= init_kernel_tracer();
2335 /* Consumer is in an ERROR state. Report back to client */
2336 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
2337 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2341 /* Need a session for kernel command */
2342 if (need_tracing_session
) {
2343 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2344 ret
= create_kernel_session(cmd_ctx
->session
);
2346 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2351 /* Start the kernel consumer daemon */
2352 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2353 if (kconsumer_data
.pid
== 0 &&
2354 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
&&
2355 cmd_ctx
->session
->start_consumer
) {
2356 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2357 ret
= start_consumerd(&kconsumer_data
);
2359 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2362 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
2364 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2368 * The consumer was just spawned so we need to add the socket to
2369 * the consumer output of the session if exist.
2371 ret
= consumer_create_socket(&kconsumer_data
,
2372 cmd_ctx
->session
->kernel_session
->consumer
);
2379 case LTTNG_DOMAIN_UST
:
2381 /* Consumer is in an ERROR state. Report back to client */
2382 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
2383 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2387 if (need_tracing_session
) {
2388 /* Create UST session if none exist. */
2389 if (cmd_ctx
->session
->ust_session
== NULL
) {
2390 ret
= create_ust_session(cmd_ctx
->session
,
2391 &cmd_ctx
->lsm
->domain
);
2392 if (ret
!= LTTNG_OK
) {
2397 /* Start the UST consumer daemons */
2399 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
2400 if (consumerd64_bin
[0] != '\0' &&
2401 ustconsumer64_data
.pid
== 0 &&
2402 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
&&
2403 cmd_ctx
->session
->start_consumer
) {
2404 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2405 ret
= start_consumerd(&ustconsumer64_data
);
2407 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
2408 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
2412 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
2413 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2415 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
2419 * Setup socket for consumer 64 bit. No need for atomic access
2420 * since it was set above and can ONLY be set in this thread.
2422 ret
= consumer_create_socket(&ustconsumer64_data
,
2423 cmd_ctx
->session
->ust_session
->consumer
);
2429 if (consumerd32_bin
[0] != '\0' &&
2430 ustconsumer32_data
.pid
== 0 &&
2431 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
&&
2432 cmd_ctx
->session
->start_consumer
) {
2433 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2434 ret
= start_consumerd(&ustconsumer32_data
);
2436 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
2437 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
2441 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
2442 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
2444 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
2448 * Setup socket for consumer 64 bit. No need for atomic access
2449 * since it was set above and can ONLY be set in this thread.
2451 ret
= consumer_create_socket(&ustconsumer32_data
,
2452 cmd_ctx
->session
->ust_session
->consumer
);
2464 /* Validate consumer daemon state when start/stop trace command */
2465 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
2466 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
2467 switch (cmd_ctx
->lsm
->domain
.type
) {
2468 case LTTNG_DOMAIN_UST
:
2469 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
2470 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
2474 case LTTNG_DOMAIN_KERNEL
:
2475 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
2476 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
2484 * Check that the UID or GID match that of the tracing session.
2485 * The root user can interact with all sessions.
2487 if (need_tracing_session
) {
2488 if (!session_access_ok(cmd_ctx
->session
,
2489 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2490 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
2491 ret
= LTTNG_ERR_EPERM
;
2496 /* Process by command type */
2497 switch (cmd_ctx
->lsm
->cmd_type
) {
2498 case LTTNG_ADD_CONTEXT
:
2500 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2501 cmd_ctx
->lsm
->u
.context
.channel_name
,
2502 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
2505 case LTTNG_DISABLE_CHANNEL
:
2507 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2508 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2511 case LTTNG_DISABLE_EVENT
:
2513 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2514 cmd_ctx
->lsm
->u
.disable
.channel_name
,
2515 cmd_ctx
->lsm
->u
.disable
.name
);
2518 case LTTNG_DISABLE_ALL_EVENT
:
2520 DBG("Disabling all events");
2522 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2523 cmd_ctx
->lsm
->u
.disable
.channel_name
);
2526 case LTTNG_DISABLE_CONSUMER
:
2528 ret
= cmd_disable_consumer(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
);
2531 case LTTNG_ENABLE_CHANNEL
:
2533 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2534 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
2537 case LTTNG_ENABLE_CONSUMER
:
2540 * XXX: 0 means that this URI should be applied on the session. Should
2541 * be a DOMAIN enuam.
2543 ret
= cmd_enable_consumer(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
);
2544 if (ret
!= LTTNG_OK
) {
2548 if (cmd_ctx
->lsm
->domain
.type
== 0) {
2549 /* Add the URI for the UST session if a consumer is present. */
2550 if (cmd_ctx
->session
->ust_session
&&
2551 cmd_ctx
->session
->ust_session
->consumer
) {
2552 ret
= cmd_enable_consumer(LTTNG_DOMAIN_UST
, cmd_ctx
->session
);
2553 } else if (cmd_ctx
->session
->kernel_session
&&
2554 cmd_ctx
->session
->kernel_session
->consumer
) {
2555 ret
= cmd_enable_consumer(LTTNG_DOMAIN_KERNEL
,
2561 case LTTNG_ENABLE_EVENT
:
2563 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2564 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2565 &cmd_ctx
->lsm
->u
.enable
.event
, NULL
, kernel_poll_pipe
[1]);
2568 case LTTNG_ENABLE_ALL_EVENT
:
2570 DBG("Enabling all events");
2572 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2573 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2574 cmd_ctx
->lsm
->u
.enable
.event
.type
, NULL
, kernel_poll_pipe
[1]);
2577 case LTTNG_LIST_TRACEPOINTS
:
2579 struct lttng_event
*events
;
2582 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
2583 if (nb_events
< 0) {
2584 /* Return value is a negative lttng_error_code. */
2590 * Setup lttng message with payload size set to the event list size in
2591 * bytes and then copy list into the llm payload.
2593 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
2599 /* Copy event list into message payload */
2600 memcpy(cmd_ctx
->llm
->payload
, events
,
2601 sizeof(struct lttng_event
) * nb_events
);
2608 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2610 struct lttng_event_field
*fields
;
2613 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
2615 if (nb_fields
< 0) {
2616 /* Return value is a negative lttng_error_code. */
2622 * Setup lttng message with payload size set to the event list size in
2623 * bytes and then copy list into the llm payload.
2625 ret
= setup_lttng_msg(cmd_ctx
,
2626 sizeof(struct lttng_event_field
) * nb_fields
);
2632 /* Copy event list into message payload */
2633 memcpy(cmd_ctx
->llm
->payload
, fields
,
2634 sizeof(struct lttng_event_field
) * nb_fields
);
2641 case LTTNG_SET_CONSUMER_URI
:
2644 struct lttng_uri
*uris
;
2646 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2647 len
= nb_uri
* sizeof(struct lttng_uri
);
2650 ret
= LTTNG_ERR_INVALID
;
2654 uris
= zmalloc(len
);
2656 ret
= LTTNG_ERR_FATAL
;
2660 /* Receive variable len data */
2661 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
2662 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2664 DBG("No URIs received from client... continuing");
2666 ret
= LTTNG_ERR_SESSION_FAIL
;
2671 ret
= cmd_set_consumer_uri(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
2673 if (ret
!= LTTNG_OK
) {
2679 * XXX: 0 means that this URI should be applied on the session. Should
2680 * be a DOMAIN enuam.
2682 if (cmd_ctx
->lsm
->domain
.type
== 0) {
2683 /* Add the URI for the UST session if a consumer is present. */
2684 if (cmd_ctx
->session
->ust_session
&&
2685 cmd_ctx
->session
->ust_session
->consumer
) {
2686 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_UST
, cmd_ctx
->session
,
2688 } else if (cmd_ctx
->session
->kernel_session
&&
2689 cmd_ctx
->session
->kernel_session
->consumer
) {
2690 ret
= cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL
,
2691 cmd_ctx
->session
, nb_uri
, uris
);
2699 case LTTNG_START_TRACE
:
2701 ret
= cmd_start_trace(cmd_ctx
->session
);
2704 case LTTNG_STOP_TRACE
:
2706 ret
= cmd_stop_trace(cmd_ctx
->session
);
2709 case LTTNG_CREATE_SESSION
:
2712 struct lttng_uri
*uris
= NULL
;
2714 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
2715 len
= nb_uri
* sizeof(struct lttng_uri
);
2718 uris
= zmalloc(len
);
2720 ret
= LTTNG_ERR_FATAL
;
2724 /* Receive variable len data */
2725 DBG("Waiting for %zu URIs from client ...", nb_uri
);
2726 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
2728 DBG("No URIs received from client... continuing");
2730 ret
= LTTNG_ERR_SESSION_FAIL
;
2735 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
2736 DBG("Creating session with ONE network URI is a bad call");
2737 ret
= LTTNG_ERR_SESSION_FAIL
;
2743 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
2750 case LTTNG_DESTROY_SESSION
:
2752 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
2754 /* Set session to NULL so we do not unlock it after free. */
2755 cmd_ctx
->session
= NULL
;
2758 case LTTNG_LIST_DOMAINS
:
2761 struct lttng_domain
*domains
;
2763 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
2765 /* Return value is a negative lttng_error_code. */
2770 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
2775 /* Copy event list into message payload */
2776 memcpy(cmd_ctx
->llm
->payload
, domains
,
2777 nb_dom
* sizeof(struct lttng_domain
));
2784 case LTTNG_LIST_CHANNELS
:
2787 struct lttng_channel
*channels
;
2789 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
2790 cmd_ctx
->session
, &channels
);
2792 /* Return value is a negative lttng_error_code. */
2797 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
2802 /* Copy event list into message payload */
2803 memcpy(cmd_ctx
->llm
->payload
, channels
,
2804 nb_chan
* sizeof(struct lttng_channel
));
2811 case LTTNG_LIST_EVENTS
:
2814 struct lttng_event
*events
= NULL
;
2816 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
2817 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
2819 /* Return value is a negative lttng_error_code. */
2824 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
2829 /* Copy event list into message payload */
2830 memcpy(cmd_ctx
->llm
->payload
, events
,
2831 nb_event
* sizeof(struct lttng_event
));
2838 case LTTNG_LIST_SESSIONS
:
2840 unsigned int nr_sessions
;
2842 session_lock_list();
2843 nr_sessions
= lttng_sessions_count(
2844 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2845 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
2847 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
2849 session_unlock_list();
2853 /* Filled the session array */
2854 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
2855 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
2856 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
2858 session_unlock_list();
2863 case LTTNG_CALIBRATE
:
2865 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
2866 &cmd_ctx
->lsm
->u
.calibrate
);
2869 case LTTNG_REGISTER_CONSUMER
:
2871 struct consumer_data
*cdata
;
2873 switch (cmd_ctx
->lsm
->domain
.type
) {
2874 case LTTNG_DOMAIN_KERNEL
:
2875 cdata
= &kconsumer_data
;
2878 ret
= LTTNG_ERR_UND
;
2882 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2883 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
2886 case LTTNG_ENABLE_EVENT_WITH_FILTER
:
2888 struct lttng_filter_bytecode
*bytecode
;
2890 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
2891 ret
= LTTNG_ERR_FILTER_INVAL
;
2894 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
== 0) {
2895 ret
= LTTNG_ERR_FILTER_INVAL
;
2898 bytecode
= zmalloc(cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
2900 ret
= LTTNG_ERR_FILTER_NOMEM
;
2903 /* Receive var. len. data */
2904 DBG("Receiving var len data from client ...");
2905 ret
= lttcomm_recv_unix_sock(sock
, bytecode
,
2906 cmd_ctx
->lsm
->u
.enable
.bytecode_len
);
2908 DBG("Nothing recv() from client var len data... continuing");
2910 ret
= LTTNG_ERR_FILTER_INVAL
;
2914 if (bytecode
->len
+ sizeof(*bytecode
)
2915 != cmd_ctx
->lsm
->u
.enable
.bytecode_len
) {
2917 ret
= LTTNG_ERR_FILTER_INVAL
;
2921 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
2922 cmd_ctx
->lsm
->u
.enable
.channel_name
,
2923 &cmd_ctx
->lsm
->u
.enable
.event
, bytecode
, kernel_poll_pipe
[1]);
2926 case LTTNG_DATA_PENDING
:
2928 ret
= cmd_data_pending(cmd_ctx
->session
);
2932 ret
= LTTNG_ERR_UND
;
2937 if (cmd_ctx
->llm
== NULL
) {
2938 DBG("Missing llm structure. Allocating one.");
2939 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
2943 /* Set return code */
2944 cmd_ctx
->llm
->ret_code
= ret
;
2946 if (cmd_ctx
->session
) {
2947 session_unlock(cmd_ctx
->session
);
2949 if (need_tracing_session
) {
2950 session_unlock_list();
2957 * Thread managing health check socket.
2959 static void *thread_manage_health(void *data
)
2961 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
2962 uint32_t revents
, nb_fd
;
2963 struct lttng_poll_event events
;
2964 struct lttcomm_health_msg msg
;
2965 struct lttcomm_health_data reply
;
2967 DBG("[thread] Manage health check started");
2969 rcu_register_thread();
2971 /* Create unix socket */
2972 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
2974 ERR("Unable to create health check Unix socket");
2980 * Set the CLOEXEC flag. Return code is useless because either way, the
2983 (void) utils_set_fd_cloexec(sock
);
2985 ret
= lttcomm_listen_unix_sock(sock
);
2991 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
2992 * more will be added to this poll set.
2994 ret
= create_thread_poll_set(&events
, 2);
2999 /* Add the application registration socket */
3000 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3006 DBG("Health check ready");
3008 /* Inifinite blocking call, waiting for transmission */
3010 ret
= lttng_poll_wait(&events
, -1);
3013 * Restart interrupted system call.
3015 if (errno
== EINTR
) {
3023 for (i
= 0; i
< nb_fd
; i
++) {
3024 /* Fetch once the poll data */
3025 revents
= LTTNG_POLL_GETEV(&events
, i
);
3026 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3028 /* Thread quit pipe has been closed. Killing thread. */
3029 ret
= check_thread_quit_pipe(pollfd
, revents
);
3035 /* Event on the registration socket */
3036 if (pollfd
== sock
) {
3037 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3038 ERR("Health socket poll error");
3044 new_sock
= lttcomm_accept_unix_sock(sock
);
3050 * Set the CLOEXEC flag. Return code is useless because either way, the
3053 (void) utils_set_fd_cloexec(new_sock
);
3055 DBG("Receiving data from client for health...");
3056 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3058 DBG("Nothing recv() from client... continuing");
3059 ret
= close(new_sock
);
3067 rcu_thread_online();
3069 switch (msg
.component
) {
3070 case LTTNG_HEALTH_CMD
:
3071 reply
.ret_code
= health_check_state(&health_thread_cmd
);
3073 case LTTNG_HEALTH_APP_MANAGE
:
3074 reply
.ret_code
= health_check_state(&health_thread_app_manage
);
3076 case LTTNG_HEALTH_APP_REG
:
3077 reply
.ret_code
= health_check_state(&health_thread_app_reg
);
3079 case LTTNG_HEALTH_KERNEL
:
3080 reply
.ret_code
= health_check_state(&health_thread_kernel
);
3082 case LTTNG_HEALTH_CONSUMER
:
3083 reply
.ret_code
= check_consumer_health();
3085 case LTTNG_HEALTH_ALL
:
3087 health_check_state(&health_thread_app_manage
) &&
3088 health_check_state(&health_thread_app_reg
) &&
3089 health_check_state(&health_thread_cmd
) &&
3090 health_check_state(&health_thread_kernel
) &&
3091 check_consumer_health();
3094 reply
.ret_code
= LTTNG_ERR_UND
;
3099 * Flip ret value since 0 is a success and 1 indicates a bad health for
3100 * the client where in the sessiond it is the opposite. Again, this is
3101 * just to make things easier for us poor developer which enjoy a lot
3104 if (reply
.ret_code
== 0 || reply
.ret_code
== 1) {
3105 reply
.ret_code
= !reply
.ret_code
;
3108 DBG2("Health check return value %d", reply
.ret_code
);
3110 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
3112 ERR("Failed to send health data back to client");
3115 /* End of transmission */
3116 ret
= close(new_sock
);
3126 ERR("Health error occurred in %s", __func__
);
3128 DBG("Health check thread dying");
3129 unlink(health_unix_sock_path
);
3136 if (new_sock
>= 0) {
3137 ret
= close(new_sock
);
3143 lttng_poll_clean(&events
);
3145 rcu_unregister_thread();
3150 * This thread manage all clients request using the unix client socket for
3153 static void *thread_manage_clients(void *data
)
3155 int sock
= -1, ret
, i
, pollfd
, err
= -1;
3157 uint32_t revents
, nb_fd
;
3158 struct command_ctx
*cmd_ctx
= NULL
;
3159 struct lttng_poll_event events
;
3161 DBG("[thread] Manage client started");
3163 rcu_register_thread();
3165 if (testpoint(thread_manage_clients
)) {
3166 goto error_testpoint
;
3169 health_code_update(&health_thread_cmd
);
3171 ret
= lttcomm_listen_unix_sock(client_sock
);
3177 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3178 * more will be added to this poll set.
3180 ret
= create_thread_poll_set(&events
, 2);
3182 goto error_create_poll
;
3185 /* Add the application registration socket */
3186 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3192 * Notify parent pid that we are ready to accept command for client side.
3194 if (opt_sig_parent
) {
3195 kill(ppid
, SIGUSR1
);
3198 if (testpoint(thread_manage_clients_before_loop
)) {
3202 health_code_update(&health_thread_cmd
);
3205 DBG("Accepting client command ...");
3207 /* Inifinite blocking call, waiting for transmission */
3209 health_poll_update(&health_thread_cmd
);
3210 ret
= lttng_poll_wait(&events
, -1);
3211 health_poll_update(&health_thread_cmd
);
3214 * Restart interrupted system call.
3216 if (errno
== EINTR
) {
3224 for (i
= 0; i
< nb_fd
; i
++) {
3225 /* Fetch once the poll data */
3226 revents
= LTTNG_POLL_GETEV(&events
, i
);
3227 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3229 health_code_update(&health_thread_cmd
);
3231 /* Thread quit pipe has been closed. Killing thread. */
3232 ret
= check_thread_quit_pipe(pollfd
, revents
);
3238 /* Event on the registration socket */
3239 if (pollfd
== client_sock
) {
3240 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3241 ERR("Client socket poll error");
3247 DBG("Wait for client response");
3249 health_code_update(&health_thread_cmd
);
3251 sock
= lttcomm_accept_unix_sock(client_sock
);
3257 * Set the CLOEXEC flag. Return code is useless because either way, the
3260 (void) utils_set_fd_cloexec(sock
);
3262 /* Set socket option for credentials retrieval */
3263 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3268 /* Allocate context command to process the client request */
3269 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3270 if (cmd_ctx
== NULL
) {
3271 PERROR("zmalloc cmd_ctx");
3275 /* Allocate data buffer for reception */
3276 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3277 if (cmd_ctx
->lsm
== NULL
) {
3278 PERROR("zmalloc cmd_ctx->lsm");
3282 cmd_ctx
->llm
= NULL
;
3283 cmd_ctx
->session
= NULL
;
3285 health_code_update(&health_thread_cmd
);
3288 * Data is received from the lttng client. The struct
3289 * lttcomm_session_msg (lsm) contains the command and data request of
3292 DBG("Receiving data from client ...");
3293 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3294 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3296 DBG("Nothing recv() from client... continuing");
3302 clean_command_ctx(&cmd_ctx
);
3306 health_code_update(&health_thread_cmd
);
3308 // TODO: Validate cmd_ctx including sanity check for
3309 // security purpose.
3311 rcu_thread_online();
3313 * This function dispatch the work to the kernel or userspace tracer
3314 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3315 * informations for the client. The command context struct contains
3316 * everything this function may needs.
3318 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
3319 rcu_thread_offline();
3329 * TODO: Inform client somehow of the fatal error. At
3330 * this point, ret < 0 means that a zmalloc failed
3331 * (ENOMEM). Error detected but still accept
3332 * command, unless a socket error has been
3335 clean_command_ctx(&cmd_ctx
);
3339 health_code_update(&health_thread_cmd
);
3341 DBG("Sending response (size: %d, retcode: %s)",
3342 cmd_ctx
->lttng_msg_size
,
3343 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3344 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3346 ERR("Failed to send data back to client");
3349 /* End of transmission */
3356 clean_command_ctx(&cmd_ctx
);
3358 health_code_update(&health_thread_cmd
);
3370 lttng_poll_clean(&events
);
3371 clean_command_ctx(&cmd_ctx
);
3376 unlink(client_unix_sock_path
);
3377 if (client_sock
>= 0) {
3378 ret
= close(client_sock
);
3385 health_error(&health_thread_cmd
);
3386 ERR("Health error occurred in %s", __func__
);
3389 health_exit(&health_thread_cmd
);
3391 DBG("Client thread dying");
3393 rcu_unregister_thread();
3399 * usage function on stderr
3401 static void usage(void)
3403 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3404 fprintf(stderr
, " -h, --help Display this usage.\n");
3405 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3406 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3407 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3408 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3409 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3410 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3411 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3412 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3413 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3414 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3415 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3416 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3417 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3418 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3419 fprintf(stderr
, " -V, --version Show version number.\n");
3420 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3421 fprintf(stderr
, " -q, --quiet No output at all.\n");
3422 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3423 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3424 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3425 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3429 * daemon argument parsing
3431 static int parse_args(int argc
, char **argv
)
3435 static struct option long_options
[] = {
3436 { "client-sock", 1, 0, 'c' },
3437 { "apps-sock", 1, 0, 'a' },
3438 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3439 { "kconsumerd-err-sock", 1, 0, 'E' },
3440 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3441 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3442 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3443 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3444 { "consumerd32-path", 1, 0, 'u' },
3445 { "consumerd32-libdir", 1, 0, 'U' },
3446 { "consumerd64-path", 1, 0, 't' },
3447 { "consumerd64-libdir", 1, 0, 'T' },
3448 { "daemonize", 0, 0, 'd' },
3449 { "sig-parent", 0, 0, 'S' },
3450 { "help", 0, 0, 'h' },
3451 { "group", 1, 0, 'g' },
3452 { "version", 0, 0, 'V' },
3453 { "quiet", 0, 0, 'q' },
3454 { "verbose", 0, 0, 'v' },
3455 { "verbose-consumer", 0, 0, 'Z' },
3456 { "no-kernel", 0, 0, 'N' },
3457 { "pidfile", 1, 0, 'p' },
3462 int option_index
= 0;
3463 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3464 long_options
, &option_index
);
3471 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3473 fprintf(stderr
, " with arg %s\n", optarg
);
3477 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3480 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3486 opt_tracing_group
= optarg
;
3492 fprintf(stdout
, "%s\n", VERSION
);
3498 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3501 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3504 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3507 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3510 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3513 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3519 lttng_opt_quiet
= 1;
3522 /* Verbose level can increase using multiple -v */
3523 lttng_opt_verbose
+= 1;
3526 opt_verbose_consumer
+= 1;
3529 consumerd32_bin
= optarg
;
3532 consumerd32_libdir
= optarg
;
3535 consumerd64_bin
= optarg
;
3538 consumerd64_libdir
= optarg
;
3541 opt_pidfile
= optarg
;
3544 /* Unknown option or other error.
3545 * Error is printed by getopt, just return */
3554 * Creates the two needed socket by the daemon.
3555 * apps_sock - The communication socket for all UST apps.
3556 * client_sock - The communication of the cli tool (lttng).
3558 static int init_daemon_socket(void)
3563 old_umask
= umask(0);
3565 /* Create client tool unix socket */
3566 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3567 if (client_sock
< 0) {
3568 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3573 /* Set the cloexec flag */
3574 ret
= utils_set_fd_cloexec(client_sock
);
3576 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
3577 "Continuing but note that the consumer daemon will have a "
3578 "reference to this socket on exec()", client_sock
);
3581 /* File permission MUST be 660 */
3582 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3584 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3589 /* Create the application unix socket */
3590 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3591 if (apps_sock
< 0) {
3592 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3597 /* Set the cloexec flag */
3598 ret
= utils_set_fd_cloexec(apps_sock
);
3600 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
3601 "Continuing but note that the consumer daemon will have a "
3602 "reference to this socket on exec()", apps_sock
);
3605 /* File permission MUST be 666 */
3606 ret
= chmod(apps_unix_sock_path
,
3607 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3609 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3614 DBG3("Session daemon client socket %d and application socket %d created",
3615 client_sock
, apps_sock
);
3623 * Check if the global socket is available, and if a daemon is answering at the
3624 * other side. If yes, error is returned.
3626 static int check_existing_daemon(void)
3628 /* Is there anybody out there ? */
3629 if (lttng_session_daemon_alive()) {
3637 * Set the tracing group gid onto the client socket.
3639 * Race window between mkdir and chown is OK because we are going from more
3640 * permissive (root.root) to less permissive (root.tracing).
3642 static int set_permissions(char *rundir
)
3647 ret
= allowed_group();
3649 WARN("No tracing group detected");
3656 /* Set lttng run dir */
3657 ret
= chown(rundir
, 0, gid
);
3659 ERR("Unable to set group on %s", rundir
);
3663 /* Ensure tracing group can search the run dir */
3664 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
3666 ERR("Unable to set permissions on %s", rundir
);
3670 /* lttng client socket path */
3671 ret
= chown(client_unix_sock_path
, 0, gid
);
3673 ERR("Unable to set group on %s", client_unix_sock_path
);
3677 /* kconsumer error socket path */
3678 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3680 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3684 /* 64-bit ustconsumer error socket path */
3685 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
3687 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
3691 /* 32-bit ustconsumer compat32 error socket path */
3692 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
3694 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
3698 DBG("All permissions are set");
3705 * Create the lttng run directory needed for all global sockets and pipe.
3707 static int create_lttng_rundir(const char *rundir
)
3711 DBG3("Creating LTTng run directory: %s", rundir
);
3713 ret
= mkdir(rundir
, S_IRWXU
);
3715 if (errno
!= EEXIST
) {
3716 ERR("Unable to create %s", rundir
);
3728 * Setup sockets and directory needed by the kconsumerd communication with the
3731 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
3735 char path
[PATH_MAX
];
3737 switch (consumer_data
->type
) {
3738 case LTTNG_CONSUMER_KERNEL
:
3739 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
3741 case LTTNG_CONSUMER64_UST
:
3742 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
3744 case LTTNG_CONSUMER32_UST
:
3745 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
3748 ERR("Consumer type unknown");
3753 DBG2("Creating consumer directory: %s", path
);
3755 ret
= mkdir(path
, S_IRWXU
);
3757 if (errno
!= EEXIST
) {
3759 ERR("Failed to create %s", path
);
3765 /* Create the kconsumerd error unix socket */
3766 consumer_data
->err_sock
=
3767 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3768 if (consumer_data
->err_sock
< 0) {
3769 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3774 /* File permission MUST be 660 */
3775 ret
= chmod(consumer_data
->err_unix_sock_path
,
3776 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3778 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3788 * Signal handler for the daemon
3790 * Simply stop all worker threads, leaving main() return gracefully after
3791 * joining all threads and calling cleanup().
3793 static void sighandler(int sig
)
3797 DBG("SIGPIPE caught");
3800 DBG("SIGINT caught");
3804 DBG("SIGTERM caught");
3813 * Setup signal handler for :
3814 * SIGINT, SIGTERM, SIGPIPE
3816 static int set_signal_handler(void)
3819 struct sigaction sa
;
3822 if ((ret
= sigemptyset(&sigset
)) < 0) {
3823 PERROR("sigemptyset");
3827 sa
.sa_handler
= sighandler
;
3828 sa
.sa_mask
= sigset
;
3830 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3831 PERROR("sigaction");
3835 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3836 PERROR("sigaction");
3840 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3841 PERROR("sigaction");
3845 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3851 * Set open files limit to unlimited. This daemon can open a large number of
3852 * file descriptors in order to consumer multiple kernel traces.
3854 static void set_ulimit(void)
3859 /* The kernel does not allowed an infinite limit for open files */
3860 lim
.rlim_cur
= 65535;
3861 lim
.rlim_max
= 65535;
3863 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3865 PERROR("failed to set open files limit");
3870 * Write pidfile using the rundir and opt_pidfile.
3872 static void write_pidfile(void)
3875 char pidfile_path
[PATH_MAX
];
3880 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
3882 /* Build pidfile path from rundir and opt_pidfile. */
3883 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
3884 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
3886 PERROR("snprintf pidfile path");
3892 * Create pid file in rundir. Return value is of no importance. The
3893 * execution will continue even though we are not able to write the file.
3895 (void) utils_create_pid_file(getpid(), pidfile_path
);
3904 int main(int argc
, char **argv
)
3908 const char *home_path
, *env_app_timeout
;
3910 init_kernel_workarounds();
3912 rcu_register_thread();
3914 setup_consumerd_path();
3916 /* Parse arguments */
3918 if ((ret
= parse_args(argc
, argv
)) < 0) {
3928 * child: setsid, close FD 0, 1, 2, chdir /
3929 * parent: exit (if fork is successful)
3937 * We are in the child. Make sure all other file
3938 * descriptors are closed, in case we are called with
3939 * more opened file descriptors than the standard ones.
3941 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
3946 /* Create thread quit pipe */
3947 if ((ret
= init_thread_quit_pipe()) < 0) {
3951 /* Check if daemon is UID = 0 */
3952 is_root
= !getuid();
3955 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
3957 /* Create global run dir with root access */
3958 ret
= create_lttng_rundir(rundir
);
3963 if (strlen(apps_unix_sock_path
) == 0) {
3964 snprintf(apps_unix_sock_path
, PATH_MAX
,
3965 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3968 if (strlen(client_unix_sock_path
) == 0) {
3969 snprintf(client_unix_sock_path
, PATH_MAX
,
3970 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3973 /* Set global SHM for ust */
3974 if (strlen(wait_shm_path
) == 0) {
3975 snprintf(wait_shm_path
, PATH_MAX
,
3976 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3979 if (strlen(health_unix_sock_path
) == 0) {
3980 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
3981 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
3984 /* Setup kernel consumerd path */
3985 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
3986 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
3987 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
3988 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
3990 DBG2("Kernel consumer err path: %s",
3991 kconsumer_data
.err_unix_sock_path
);
3992 DBG2("Kernel consumer cmd path: %s",
3993 kconsumer_data
.cmd_unix_sock_path
);
3995 home_path
= get_home_dir();
3996 if (home_path
== NULL
) {
3997 /* TODO: Add --socket PATH option */
3998 ERR("Can't get HOME directory for sockets creation.");
4004 * Create rundir from home path. This will create something like
4007 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4013 ret
= create_lttng_rundir(rundir
);
4018 if (strlen(apps_unix_sock_path
) == 0) {
4019 snprintf(apps_unix_sock_path
, PATH_MAX
,
4020 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4023 /* Set the cli tool unix socket path */
4024 if (strlen(client_unix_sock_path
) == 0) {
4025 snprintf(client_unix_sock_path
, PATH_MAX
,
4026 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4029 /* Set global SHM for ust */
4030 if (strlen(wait_shm_path
) == 0) {
4031 snprintf(wait_shm_path
, PATH_MAX
,
4032 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4035 /* Set health check Unix path */
4036 if (strlen(health_unix_sock_path
) == 0) {
4037 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
4038 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
4042 /* Set consumer initial state */
4043 kernel_consumerd_state
= CONSUMER_STOPPED
;
4044 ust_consumerd_state
= CONSUMER_STOPPED
;
4046 DBG("Client socket path %s", client_unix_sock_path
);
4047 DBG("Application socket path %s", apps_unix_sock_path
);
4048 DBG("LTTng run directory path: %s", rundir
);
4050 /* 32 bits consumerd path setup */
4051 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4052 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4053 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4054 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4056 DBG2("UST consumer 32 bits err path: %s",
4057 ustconsumer32_data
.err_unix_sock_path
);
4058 DBG2("UST consumer 32 bits cmd path: %s",
4059 ustconsumer32_data
.cmd_unix_sock_path
);
4061 /* 64 bits consumerd path setup */
4062 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4063 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4064 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4065 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4067 DBG2("UST consumer 64 bits err path: %s",
4068 ustconsumer64_data
.err_unix_sock_path
);
4069 DBG2("UST consumer 64 bits cmd path: %s",
4070 ustconsumer64_data
.cmd_unix_sock_path
);
4073 * See if daemon already exist.
4075 if ((ret
= check_existing_daemon()) < 0) {
4076 ERR("Already running daemon.\n");
4078 * We do not goto exit because we must not cleanup()
4079 * because a daemon is already running.
4085 * Init UST app hash table. Alloc hash table before this point since
4086 * cleanup() can get called after that point.
4090 /* After this point, we can safely call cleanup() with "goto exit" */
4093 * These actions must be executed as root. We do that *after* setting up
4094 * the sockets path because we MUST make the check for another daemon using
4095 * those paths *before* trying to set the kernel consumer sockets and init
4099 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4104 /* Setup kernel tracer */
4105 if (!opt_no_kernel
) {
4106 init_kernel_tracer();
4109 /* Set ulimit for open files */
4112 /* init lttng_fd tracking must be done after set_ulimit. */
4115 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4120 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4125 if ((ret
= set_signal_handler()) < 0) {
4129 /* Setup the needed unix socket */
4130 if ((ret
= init_daemon_socket()) < 0) {
4134 /* Set credentials to socket */
4135 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4139 /* Get parent pid if -S, --sig-parent is specified. */
4140 if (opt_sig_parent
) {
4144 /* Setup the kernel pipe for waking up the kernel thread */
4145 if (is_root
&& !opt_no_kernel
) {
4146 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
4151 /* Setup the thread apps communication pipe. */
4152 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
4156 /* Init UST command queue. */
4157 cds_wfq_init(&ust_cmd_queue
.queue
);
4160 * Get session list pointer. This pointer MUST NOT be free(). This list is
4161 * statically declared in session.c
4163 session_list_ptr
= session_get_list();
4165 /* Set up max poll set size */
4166 lttng_poll_set_max_size();
4170 /* Init all health thread counters. */
4171 health_init(&health_thread_cmd
);
4172 health_init(&health_thread_kernel
);
4173 health_init(&health_thread_app_manage
);
4174 health_init(&health_thread_app_reg
);
4177 * Init health counters of the consumer thread. We do a quick hack here to
4178 * the state of the consumer health is fine even if the thread is not
4179 * started. Once the thread starts, the health state is updated with a poll
4180 * value to set a health code path. This is simply to ease our life and has
4181 * no cost what so ever.
4183 health_init(&kconsumer_data
.health
);
4184 health_poll_update(&kconsumer_data
.health
);
4185 health_init(&ustconsumer32_data
.health
);
4186 health_poll_update(&ustconsumer32_data
.health
);
4187 health_init(&ustconsumer64_data
.health
);
4188 health_poll_update(&ustconsumer64_data
.health
);
4190 /* Check for the application socket timeout env variable. */
4191 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
4192 if (env_app_timeout
) {
4193 app_socket_timeout
= atoi(env_app_timeout
);
4195 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
4200 /* Create thread to manage the client socket */
4201 ret
= pthread_create(&health_thread
, NULL
,
4202 thread_manage_health
, (void *) NULL
);
4204 PERROR("pthread_create health");
4208 /* Create thread to manage the client socket */
4209 ret
= pthread_create(&client_thread
, NULL
,
4210 thread_manage_clients
, (void *) NULL
);
4212 PERROR("pthread_create clients");
4216 /* Create thread to dispatch registration */
4217 ret
= pthread_create(&dispatch_thread
, NULL
,
4218 thread_dispatch_ust_registration
, (void *) NULL
);
4220 PERROR("pthread_create dispatch");
4224 /* Create thread to manage application registration. */
4225 ret
= pthread_create(®_apps_thread
, NULL
,
4226 thread_registration_apps
, (void *) NULL
);
4228 PERROR("pthread_create registration");
4232 /* Create thread to manage application socket */
4233 ret
= pthread_create(&apps_thread
, NULL
,
4234 thread_manage_apps
, (void *) NULL
);
4236 PERROR("pthread_create apps");
4240 /* Don't start this thread if kernel tracing is not requested nor root */
4241 if (is_root
&& !opt_no_kernel
) {
4242 /* Create kernel thread to manage kernel event */
4243 ret
= pthread_create(&kernel_thread
, NULL
,
4244 thread_manage_kernel
, (void *) NULL
);
4246 PERROR("pthread_create kernel");
4250 ret
= pthread_join(kernel_thread
, &status
);
4252 PERROR("pthread_join");
4253 goto error
; /* join error, exit without cleanup */
4258 ret
= pthread_join(apps_thread
, &status
);
4260 PERROR("pthread_join");
4261 goto error
; /* join error, exit without cleanup */
4265 ret
= pthread_join(reg_apps_thread
, &status
);
4267 PERROR("pthread_join");
4268 goto error
; /* join error, exit without cleanup */
4272 ret
= pthread_join(dispatch_thread
, &status
);
4274 PERROR("pthread_join");
4275 goto error
; /* join error, exit without cleanup */
4279 ret
= pthread_join(client_thread
, &status
);
4281 PERROR("pthread_join");
4282 goto error
; /* join error, exit without cleanup */
4285 ret
= join_consumer_thread(&kconsumer_data
);
4287 PERROR("join_consumer");
4288 goto error
; /* join error, exit without cleanup */
4291 ret
= join_consumer_thread(&ustconsumer32_data
);
4293 PERROR("join_consumer ust32");
4294 goto error
; /* join error, exit without cleanup */
4297 ret
= join_consumer_thread(&ustconsumer64_data
);
4299 PERROR("join_consumer ust64");
4300 goto error
; /* join error, exit without cleanup */
4304 ret
= pthread_join(health_thread
, &status
);
4306 PERROR("pthread_join health thread");
4307 goto error
; /* join error, exit without cleanup */
4313 * cleanup() is called when no other thread is running.
4315 rcu_thread_online();
4317 rcu_thread_offline();
4318 rcu_unregister_thread();