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 it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
48 #include "compat/poll.h"
52 #include "hashtable.h"
53 #include "kernel-ctl.h"
54 #include "lttng-sessiond.h"
60 struct consumer_data
{
61 enum lttng_consumer_type type
;
63 pthread_t thread
; /* Worker thread interacting with the consumer */
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex
;
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path
[PATH_MAX
];
75 char cmd_unix_sock_path
[PATH_MAX
];
79 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
80 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
81 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
82 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
85 int opt_verbose
; /* Not static for lttngerr.h */
86 int opt_verbose_consumer
; /* Not static for lttngerr.h */
87 int opt_quiet
; /* Not static for lttngerr.h */
90 const char *opt_tracing_group
;
91 static int opt_sig_parent
;
92 static int opt_daemon
;
93 static int is_root
; /* Set to 1 if the daemon is running as root */
94 static pid_t ppid
; /* Parent PID for --sig-parent option */
96 /* Consumer daemon specific control data */
97 static struct consumer_data kconsumer_data
= {
98 .type
= LTTNG_CONSUMER_KERNEL
,
100 static struct consumer_data ustconsumer_data
= {
101 .type
= LTTNG_CONSUMER_UST
,
104 static int dispatch_thread_exit
;
106 /* Global application Unix socket path */
107 static char apps_unix_sock_path
[PATH_MAX
];
108 /* Global client Unix socket path */
109 static char client_unix_sock_path
[PATH_MAX
];
110 /* global wait shm path for UST */
111 static char wait_shm_path
[PATH_MAX
];
113 /* Sockets and FDs */
114 static int client_sock
;
115 static int apps_sock
;
116 static int kernel_tracer_fd
;
117 static int kernel_poll_pipe
[2];
120 * Quit pipe for all threads. This permits a single cancellation point
121 * for all threads when receiving an event on the pipe.
123 static int thread_quit_pipe
[2];
126 * This pipe is used to inform the thread managing application communication
127 * that a command is queued and ready to be processed.
129 static int apps_cmd_pipe
[2];
131 /* Pthread, Mutexes and Semaphores */
132 static pthread_t apps_thread
;
133 static pthread_t reg_apps_thread
;
134 static pthread_t client_thread
;
135 static pthread_t kernel_thread
;
136 static pthread_t dispatch_thread
;
140 * UST registration command queue. This queue is tied with a futex and uses a N
141 * wakers / 1 waiter implemented and detailed in futex.c/.h
143 * The thread_manage_apps and thread_dispatch_ust_registration interact with
144 * this queue and the wait/wake scheme.
146 static struct ust_cmd_queue ust_cmd_queue
;
149 * Pointer initialized before thread creation.
151 * This points to the tracing session list containing the session count and a
152 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
153 * MUST NOT be taken if you call a public function in session.c.
155 * The lock is nested inside the structure: session_list_ptr->lock. Please use
156 * session_lock_list and session_unlock_list for lock acquisition.
158 static struct ltt_session_list
*session_list_ptr
;
163 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
165 static int create_thread_poll_set(struct lttng_poll_event
*events
,
170 if (events
== NULL
|| size
== 0) {
175 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
181 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
193 * Check if the thread quit pipe was triggered.
195 * Return 1 if it was triggered else 0;
197 static int check_thread_quit_pipe(int fd
, uint32_t events
)
199 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
207 * Remove modules in reverse load order.
209 static int modprobe_remove_kernel_modules(void)
214 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
215 ret
= snprintf(modprobe
, sizeof(modprobe
),
216 "/sbin/modprobe -r -q %s",
217 kernel_modules_list
[i
].name
);
219 perror("snprintf modprobe -r");
222 modprobe
[sizeof(modprobe
) - 1] = '\0';
223 ret
= system(modprobe
);
225 ERR("Unable to launch modprobe -r for module %s",
226 kernel_modules_list
[i
].name
);
227 } else if (kernel_modules_list
[i
].required
228 && WEXITSTATUS(ret
) != 0) {
229 ERR("Unable to remove module %s",
230 kernel_modules_list
[i
].name
);
232 DBG("Modprobe removal successful %s",
233 kernel_modules_list
[i
].name
);
242 * Return group ID of the tracing group or -1 if not found.
244 static gid_t
allowed_group(void)
248 if (opt_tracing_group
) {
249 grp
= getgrnam(opt_tracing_group
);
251 grp
= getgrnam(default_tracing_group
);
261 * Init thread quit pipe.
263 * Return -1 on error or 0 if all pipes are created.
265 static int init_thread_quit_pipe(void)
269 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
271 perror("thread quit pipe");
280 * Complete teardown of a kernel session. This free all data structure related
281 * to a kernel session and update counter.
283 static void teardown_kernel_session(struct ltt_session
*session
)
285 if (session
->kernel_session
!= NULL
) {
286 DBG("Tearing down kernel session");
289 * If a custom kernel consumer was registered, close the socket before
290 * tearing down the complete kernel session structure
292 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
293 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
296 trace_kernel_destroy_session(session
->kernel_session
);
297 /* Extra precaution */
298 session
->kernel_session
= NULL
;
303 * Complete teardown of all UST sessions. This will free everything on his path
304 * and destroy the core essence of all ust sessions :)
306 static void teardown_ust_session(struct ltt_session
*session
)
308 DBG("Tearing down UST session(s)");
310 trace_ust_destroy_session(session
->ust_session
);
314 * Stop all threads by closing the thread quit pipe.
316 static void stop_threads(void)
320 /* Stopping all threads */
321 DBG("Terminating all threads");
322 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
324 ERR("write error on thread quit pipe");
327 /* Dispatch thread */
328 dispatch_thread_exit
= 1;
329 futex_nto1_wake(&ust_cmd_queue
.futex
);
335 static void cleanup(void)
339 struct ltt_session
*sess
, *stmp
;
344 DBG("Removing %s directory", LTTNG_RUNDIR
);
345 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
347 ERR("asprintf failed. Something is really wrong!");
350 /* Remove lttng run directory */
353 ERR("Unable to clean " LTTNG_RUNDIR
);
357 DBG("Cleaning up all session");
359 /* Destroy session list mutex */
360 if (session_list_ptr
!= NULL
) {
361 pthread_mutex_destroy(&session_list_ptr
->lock
);
363 /* Cleanup ALL session */
364 cds_list_for_each_entry_safe(sess
, stmp
,
365 &session_list_ptr
->head
, list
) {
366 teardown_kernel_session(sess
);
367 teardown_ust_session(sess
);
372 DBG("Closing all UST sockets");
373 ust_app_clean_list();
375 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
377 DBG("Closing kernel fd");
378 close(kernel_tracer_fd
);
381 DBG("Unloading kernel modules");
382 modprobe_remove_kernel_modules();
385 close(thread_quit_pipe
[0]);
386 close(thread_quit_pipe
[1]);
389 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
390 "Matthew, BEET driven development works!%c[%dm",
391 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
396 * Send data on a unix socket using the liblttsessiondcomm API.
398 * Return lttcomm error code.
400 static int send_unix_sock(int sock
, void *buf
, size_t len
)
402 /* Check valid length */
407 return lttcomm_send_unix_sock(sock
, buf
, len
);
411 * Free memory of a command context structure.
413 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
415 DBG("Clean command context structure");
417 if ((*cmd_ctx
)->llm
) {
418 free((*cmd_ctx
)->llm
);
420 if ((*cmd_ctx
)->lsm
) {
421 free((*cmd_ctx
)->lsm
);
429 * Send all stream fds of kernel channel to the consumer.
431 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
432 int sock
, struct ltt_kernel_channel
*channel
)
435 struct ltt_kernel_stream
*stream
;
436 struct lttcomm_consumer_msg lkm
;
438 DBG("Sending streams of channel %s to kernel consumer",
439 channel
->channel
->name
);
442 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
443 lkm
.u
.channel
.channel_key
= channel
->fd
;
444 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
445 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
446 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
447 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
449 perror("send consumer channel");
454 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
458 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
459 lkm
.u
.stream
.channel_key
= channel
->fd
;
460 lkm
.u
.stream
.stream_key
= stream
->fd
;
461 lkm
.u
.stream
.state
= stream
->state
;
462 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
463 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
464 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
465 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
466 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
467 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
469 perror("send consumer stream");
472 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
474 perror("send consumer stream ancillary data");
479 DBG("consumer channel streams sent");
488 * Send all stream fds of the kernel session to the consumer.
490 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
491 struct ltt_kernel_session
*session
)
494 struct ltt_kernel_channel
*chan
;
495 struct lttcomm_consumer_msg lkm
;
496 int sock
= session
->consumer_fd
;
498 DBG("Sending metadata stream fd");
500 /* Extra protection. It's NOT supposed to be set to 0 at this point */
501 if (session
->consumer_fd
== 0) {
502 session
->consumer_fd
= consumer_data
->cmd_sock
;
505 if (session
->metadata_stream_fd
!= 0) {
506 /* Send metadata channel fd */
507 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
508 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
509 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
510 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
511 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
512 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
514 perror("send consumer channel");
518 /* Send metadata stream fd */
519 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
520 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
521 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
522 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
523 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
524 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
525 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
526 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
527 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
528 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
530 perror("send consumer stream");
533 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
535 perror("send consumer stream");
540 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
541 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
547 DBG("consumer fds (metadata and channel streams) sent");
556 * Notify UST applications using the shm mmap futex.
558 static int notify_ust_apps(int active
)
562 DBG("Notifying applications of session daemon state: %d", active
);
564 /* See shm.c for this call implying mmap, shm and futex calls */
565 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
566 if (wait_shm_mmap
== NULL
) {
570 /* Wake waiting process */
571 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
573 /* Apps notified successfully */
581 * Setup the outgoing data buffer for the response (llm) by allocating the
582 * right amount of memory and copying the original information from the lsm
585 * Return total size of the buffer pointed by buf.
587 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
593 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
594 if (cmd_ctx
->llm
== NULL
) {
600 /* Copy common data */
601 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
602 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
604 cmd_ctx
->llm
->data_size
= size
;
605 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
614 * Update the kernel poll set of all channel fd available over all tracing
615 * session. Add the wakeup pipe at the end of the set.
617 static int update_kernel_poll(struct lttng_poll_event
*events
)
620 struct ltt_session
*session
;
621 struct ltt_kernel_channel
*channel
;
623 DBG("Updating kernel poll set");
626 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
627 session_lock(session
);
628 if (session
->kernel_session
== NULL
) {
629 session_unlock(session
);
633 cds_list_for_each_entry(channel
,
634 &session
->kernel_session
->channel_list
.head
, list
) {
635 /* Add channel fd to the kernel poll set */
636 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
638 session_unlock(session
);
641 DBG("Channel fd %d added to kernel set", channel
->fd
);
643 session_unlock(session
);
645 session_unlock_list();
650 session_unlock_list();
655 * Find the channel fd from 'fd' over all tracing session. When found, check
656 * for new channel stream and send those stream fds to the kernel consumer.
658 * Useful for CPU hotplug feature.
660 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
663 struct ltt_session
*session
;
664 struct ltt_kernel_channel
*channel
;
666 DBG("Updating kernel streams for channel fd %d", fd
);
669 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
670 session_lock(session
);
671 if (session
->kernel_session
== NULL
) {
672 session_unlock(session
);
676 /* This is not suppose to be 0 but this is an extra security check */
677 if (session
->kernel_session
->consumer_fd
== 0) {
678 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
681 cds_list_for_each_entry(channel
,
682 &session
->kernel_session
->channel_list
.head
, list
) {
683 if (channel
->fd
== fd
) {
684 DBG("Channel found, updating kernel streams");
685 ret
= kernel_open_channel_stream(channel
);
691 * Have we already sent fds to the consumer? If yes, it means
692 * that tracing is started so it is safe to send our updated
695 if (session
->kernel_session
->consumer_fds_sent
== 1) {
696 ret
= send_kconsumer_channel_streams(consumer_data
,
697 session
->kernel_session
->consumer_fd
, channel
);
705 session_unlock(session
);
707 session_unlock_list();
711 session_unlock(session
);
712 session_unlock_list();
717 * For each tracing session, update newly registered apps.
719 static void update_ust_app(int app_sock
)
721 struct ltt_session
*sess
, *stmp
;
723 /* For all tracing session(s) */
724 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
725 if (sess
->ust_session
) {
726 ust_app_global_update(sess
->ust_session
, app_sock
);
732 * This thread manage event coming from the kernel.
734 * Features supported in this thread:
737 static void *thread_manage_kernel(void *data
)
739 int ret
, i
, pollfd
, update_poll_flag
= 1;
740 uint32_t revents
, nb_fd
;
742 struct lttng_poll_event events
;
744 DBG("Thread manage kernel started");
746 ret
= create_thread_poll_set(&events
, 2);
751 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
757 if (update_poll_flag
== 1) {
759 * Reset number of fd in the poll set. Always 2 since there is the thread
760 * quit pipe and the kernel pipe.
764 ret
= update_kernel_poll(&events
);
768 update_poll_flag
= 0;
771 nb_fd
= LTTNG_POLL_GETNB(&events
);
773 DBG("Thread kernel polling on %d fds", nb_fd
);
775 /* Zeroed the poll events */
776 lttng_poll_reset(&events
);
778 /* Poll infinite value of time */
779 ret
= lttng_poll_wait(&events
, -1);
782 } else if (ret
== 0) {
783 /* Should not happen since timeout is infinite */
784 ERR("Return value of poll is 0 with an infinite timeout.\n"
785 "This should not have happened! Continuing...");
789 for (i
= 0; i
< nb_fd
; i
++) {
790 /* Fetch once the poll data */
791 revents
= LTTNG_POLL_GETEV(&events
, i
);
792 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
794 /* Thread quit pipe has been closed. Killing thread. */
795 ret
= check_thread_quit_pipe(pollfd
, revents
);
800 /* Check for data on kernel pipe */
801 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
802 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
803 update_poll_flag
= 1;
807 * New CPU detected by the kernel. Adding kernel stream to
808 * kernel session and updating the kernel consumer
810 if (revents
& LPOLLIN
) {
811 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
817 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
818 * and unregister kernel stream at this point.
826 DBG("Kernel thread dying");
827 close(kernel_poll_pipe
[0]);
828 close(kernel_poll_pipe
[1]);
830 lttng_poll_clean(&events
);
836 * This thread manage the consumer error sent back to the session daemon.
838 static void *thread_manage_consumer(void *data
)
840 int sock
= 0, i
, ret
, pollfd
;
841 uint32_t revents
, nb_fd
;
842 enum lttcomm_return_code code
;
843 struct lttng_poll_event events
;
844 struct consumer_data
*consumer_data
= data
;
846 DBG("[thread] Manage consumer started");
848 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
854 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
855 * Nothing more will be added to this poll set.
857 ret
= create_thread_poll_set(&events
, 2);
862 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
867 nb_fd
= LTTNG_POLL_GETNB(&events
);
869 /* Inifinite blocking call, waiting for transmission */
870 ret
= lttng_poll_wait(&events
, -1);
875 for (i
= 0; i
< nb_fd
; i
++) {
876 /* Fetch once the poll data */
877 revents
= LTTNG_POLL_GETEV(&events
, i
);
878 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
880 /* Thread quit pipe has been closed. Killing thread. */
881 ret
= check_thread_quit_pipe(pollfd
, revents
);
886 /* Event on the registration socket */
887 if (pollfd
== consumer_data
->err_sock
) {
888 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
889 ERR("consumer err socket poll error");
895 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
900 DBG2("Receiving code from consumer err_sock");
902 /* Getting status code from kconsumerd */
903 ret
= lttcomm_recv_unix_sock(sock
, &code
,
904 sizeof(enum lttcomm_return_code
));
909 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
910 consumer_data
->cmd_sock
=
911 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
912 if (consumer_data
->cmd_sock
< 0) {
913 sem_post(&consumer_data
->sem
);
914 PERROR("consumer connect");
917 /* Signal condition to tell that the kconsumerd is ready */
918 sem_post(&consumer_data
->sem
);
919 DBG("consumer command socket ready");
921 ERR("consumer error when waiting for SOCK_READY : %s",
922 lttcomm_get_readable_code(-code
));
926 /* Remove the kconsumerd error sock since we've established a connexion */
927 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
932 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
937 /* Update number of fd */
938 nb_fd
= LTTNG_POLL_GETNB(&events
);
940 /* Inifinite blocking call, waiting for transmission */
941 ret
= lttng_poll_wait(&events
, -1);
946 for (i
= 0; i
< nb_fd
; i
++) {
947 /* Fetch once the poll data */
948 revents
= LTTNG_POLL_GETEV(&events
, i
);
949 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
951 /* Thread quit pipe has been closed. Killing thread. */
952 ret
= check_thread_quit_pipe(pollfd
, revents
);
957 /* Event on the kconsumerd socket */
958 if (pollfd
== sock
) {
959 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
960 ERR("consumer err socket second poll error");
966 /* Wait for any kconsumerd error */
967 ret
= lttcomm_recv_unix_sock(sock
, &code
,
968 sizeof(enum lttcomm_return_code
));
970 ERR("consumer closed the command socket");
974 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
977 DBG("consumer thread dying");
978 close(consumer_data
->err_sock
);
979 close(consumer_data
->cmd_sock
);
982 unlink(consumer_data
->err_unix_sock_path
);
983 unlink(consumer_data
->cmd_unix_sock_path
);
984 consumer_data
->pid
= 0;
986 lttng_poll_clean(&events
);
992 * This thread manage application communication.
994 static void *thread_manage_apps(void *data
)
997 uint32_t revents
, nb_fd
;
998 struct ust_command ust_cmd
;
999 struct lttng_poll_event events
;
1001 DBG("[thread] Manage application started");
1003 rcu_register_thread();
1004 rcu_thread_online();
1006 ret
= create_thread_poll_set(&events
, 2);
1011 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1017 /* Zeroed the events structure */
1018 lttng_poll_reset(&events
);
1020 nb_fd
= LTTNG_POLL_GETNB(&events
);
1022 DBG("Apps thread polling on %d fds", nb_fd
);
1024 /* Inifinite blocking call, waiting for transmission */
1025 ret
= lttng_poll_wait(&events
, -1);
1030 for (i
= 0; i
< nb_fd
; i
++) {
1031 /* Fetch once the poll data */
1032 revents
= LTTNG_POLL_GETEV(&events
, i
);
1033 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1035 /* Thread quit pipe has been closed. Killing thread. */
1036 ret
= check_thread_quit_pipe(pollfd
, revents
);
1041 /* Inspect the apps cmd pipe */
1042 if (pollfd
== apps_cmd_pipe
[0]) {
1043 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1044 ERR("Apps command pipe error");
1046 } else if (revents
& LPOLLIN
) {
1048 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1049 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1050 perror("read apps cmd pipe");
1054 /* Register applicaton to the session daemon */
1055 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1058 /* Only critical ENOMEM error can be returned here */
1063 * Add channel(s) and event(s) to newly registered apps
1064 * from lttng global UST domain.
1066 update_ust_app(ust_cmd
.sock
);
1068 ret
= ustctl_register_done(ust_cmd
.sock
);
1071 * If the registration is not possible, we simply
1072 * unregister the apps and continue
1074 ust_app_unregister(ust_cmd
.sock
);
1077 * We just need here to monitor the close of the UST
1078 * socket and poll set monitor those by default.
1080 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1085 DBG("Apps with sock %d added to poll set",
1093 * At this point, we know that a registered application made
1094 * the event at poll_wait.
1096 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1097 /* Removing from the poll set */
1098 ret
= lttng_poll_del(&events
, pollfd
);
1103 /* Socket closed on remote end. */
1104 ust_app_unregister(pollfd
);
1112 DBG("Application communication apps dying");
1113 close(apps_cmd_pipe
[0]);
1114 close(apps_cmd_pipe
[1]);
1116 lttng_poll_clean(&events
);
1118 rcu_thread_offline();
1119 rcu_unregister_thread();
1124 * Dispatch request from the registration threads to the application
1125 * communication thread.
1127 static void *thread_dispatch_ust_registration(void *data
)
1130 struct cds_wfq_node
*node
;
1131 struct ust_command
*ust_cmd
= NULL
;
1133 DBG("[thread] Dispatch UST command started");
1135 while (!dispatch_thread_exit
) {
1136 /* Atomically prepare the queue futex */
1137 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1140 /* Dequeue command for registration */
1141 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1143 DBG("Woken up but nothing in the UST command queue");
1144 /* Continue thread execution */
1148 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1150 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1151 " gid:%d sock:%d name:%s (version %d.%d)",
1152 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1153 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1154 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1155 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1157 * Inform apps thread of the new application registration. This
1158 * call is blocking so we can be assured that the data will be read
1159 * at some point in time or wait to the end of the world :)
1161 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1162 sizeof(struct ust_command
));
1164 perror("write apps cmd pipe");
1165 if (errno
== EBADF
) {
1167 * We can't inform the application thread to process
1168 * registration. We will exit or else application
1169 * registration will not occur and tracing will never
1176 } while (node
!= NULL
);
1178 /* Futex wait on queue. Blocking call on futex() */
1179 futex_nto1_wait(&ust_cmd_queue
.futex
);
1183 DBG("Dispatch thread dying");
1188 * This thread manage application registration.
1190 static void *thread_registration_apps(void *data
)
1192 int sock
= 0, i
, ret
, pollfd
;
1193 uint32_t revents
, nb_fd
;
1194 struct lttng_poll_event events
;
1196 * Get allocated in this thread, enqueued to a global queue, dequeued and
1197 * freed in the manage apps thread.
1199 struct ust_command
*ust_cmd
= NULL
;
1201 DBG("[thread] Manage application registration started");
1203 ret
= lttcomm_listen_unix_sock(apps_sock
);
1209 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1210 * more will be added to this poll set.
1212 ret
= create_thread_poll_set(&events
, 2);
1217 /* Add the application registration socket */
1218 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1223 /* Notify all applications to register */
1224 ret
= notify_ust_apps(1);
1226 ERR("Failed to notify applications or create the wait shared memory.\n"
1227 "Execution continues but there might be problem for already\n"
1228 "running applications that wishes to register.");
1232 DBG("Accepting application registration");
1234 nb_fd
= LTTNG_POLL_GETNB(&events
);
1236 /* Inifinite blocking call, waiting for transmission */
1237 ret
= lttng_poll_wait(&events
, -1);
1242 for (i
= 0; i
< nb_fd
; i
++) {
1243 /* Fetch once the poll data */
1244 revents
= LTTNG_POLL_GETEV(&events
, i
);
1245 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1247 /* Thread quit pipe has been closed. Killing thread. */
1248 ret
= check_thread_quit_pipe(pollfd
, revents
);
1253 /* Event on the registration socket */
1254 if (pollfd
== apps_sock
) {
1255 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1256 ERR("Register apps socket poll error");
1258 } else if (revents
& LPOLLIN
) {
1259 sock
= lttcomm_accept_unix_sock(apps_sock
);
1264 /* Create UST registration command for enqueuing */
1265 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1266 if (ust_cmd
== NULL
) {
1267 perror("ust command zmalloc");
1272 * Using message-based transmissions to ensure we don't
1273 * have to deal with partially received messages.
1275 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1276 sizeof(struct ust_register_msg
));
1277 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1279 perror("lttcomm_recv_unix_sock register apps");
1281 ERR("Wrong size received on apps register");
1288 ust_cmd
->sock
= sock
;
1290 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1291 " gid:%d sock:%d name:%s (version %d.%d)",
1292 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1293 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1294 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1295 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1298 * Lock free enqueue the registration request. The red pill
1299 * has been taken! This apps will be part of the *system*.
1301 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1304 * Wake the registration queue futex. Implicit memory
1305 * barrier with the exchange in cds_wfq_enqueue.
1307 futex_nto1_wake(&ust_cmd_queue
.futex
);
1314 DBG("UST Registration thread dying");
1316 /* Notify that the registration thread is gone */
1321 unlink(apps_unix_sock_path
);
1323 lttng_poll_clean(&events
);
1329 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1330 * exec or it will fails.
1332 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1335 struct timespec timeout
;
1337 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1338 timeout
.tv_nsec
= 0;
1340 /* Setup semaphore */
1341 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1343 PERROR("sem_init consumer semaphore");
1347 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1348 thread_manage_consumer
, consumer_data
);
1350 PERROR("pthread_create consumer");
1355 /* Get time for sem_timedwait absolute timeout */
1356 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1358 PERROR("clock_gettime spawn consumer");
1359 /* Infinite wait for the kconsumerd thread to be ready */
1360 ret
= sem_wait(&consumer_data
->sem
);
1362 /* Normal timeout if the gettime was successful */
1363 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1364 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1368 if (errno
== ETIMEDOUT
) {
1370 * Call has timed out so we kill the kconsumerd_thread and return
1373 ERR("The consumer thread was never ready. Killing it");
1374 ret
= pthread_cancel(consumer_data
->thread
);
1376 PERROR("pthread_cancel consumer thread");
1379 PERROR("semaphore wait failed consumer thread");
1384 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1385 if (consumer_data
->pid
== 0) {
1386 ERR("Kconsumerd did not start");
1387 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1390 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1399 * Join consumer thread
1401 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1406 if (consumer_data
->pid
!= 0) {
1407 ret
= kill(consumer_data
->pid
, SIGTERM
);
1409 ERR("Error killing consumer daemon");
1412 return pthread_join(consumer_data
->thread
, &status
);
1419 * Fork and exec a consumer daemon (consumerd).
1421 * Return pid if successful else -1.
1423 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1427 const char *verbosity
;
1429 DBG("Spawning consumerd");
1436 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1437 verbosity
= "--verbose";
1439 verbosity
= "--quiet";
1441 switch (consumer_data
->type
) {
1442 case LTTNG_CONSUMER_KERNEL
:
1443 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1444 "lttng-consumerd", verbosity
, "-k", NULL
);
1446 case LTTNG_CONSUMER_UST
:
1447 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1448 "lttng-consumerd", verbosity
, "-u", NULL
);
1451 perror("unknown consumer type");
1455 perror("kernel start consumer exec");
1458 } else if (pid
> 0) {
1461 perror("start consumer fork");
1468 * Spawn the consumerd daemon and session daemon thread.
1470 static int start_consumerd(struct consumer_data
*consumer_data
)
1474 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1475 if (consumer_data
->pid
!= 0) {
1476 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1480 ret
= spawn_consumerd(consumer_data
);
1482 ERR("Spawning consumerd failed");
1483 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1487 /* Setting up the consumer_data pid */
1488 consumer_data
->pid
= ret
;
1489 DBG2("Consumer pid %d", consumer_data
->pid
);
1490 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1492 DBG2("Spawning consumer control thread");
1493 ret
= spawn_consumer_thread(consumer_data
);
1495 ERR("Fatal error spawning consumer control thread");
1507 * modprobe_kernel_modules
1509 static int modprobe_kernel_modules(void)
1514 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1515 ret
= snprintf(modprobe
, sizeof(modprobe
),
1516 "/sbin/modprobe %s%s",
1517 kernel_modules_list
[i
].required
? "" : "-q ",
1518 kernel_modules_list
[i
].name
);
1520 perror("snprintf modprobe");
1523 modprobe
[sizeof(modprobe
) - 1] = '\0';
1524 ret
= system(modprobe
);
1526 ERR("Unable to launch modprobe for module %s",
1527 kernel_modules_list
[i
].name
);
1528 } else if (kernel_modules_list
[i
].required
1529 && WEXITSTATUS(ret
) != 0) {
1530 ERR("Unable to load module %s",
1531 kernel_modules_list
[i
].name
);
1533 DBG("Modprobe successfully %s",
1534 kernel_modules_list
[i
].name
);
1545 static int mount_debugfs(char *path
)
1548 char *type
= "debugfs";
1550 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1552 PERROR("Cannot create debugfs path");
1556 ret
= mount(type
, path
, type
, 0, NULL
);
1558 PERROR("Cannot mount debugfs");
1562 DBG("Mounted debugfs successfully at %s", path
);
1569 * Setup necessary data for kernel tracer action.
1571 static void init_kernel_tracer(void)
1574 char *proc_mounts
= "/proc/mounts";
1576 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1579 /* Detect debugfs */
1580 fp
= fopen(proc_mounts
, "r");
1582 ERR("Unable to probe %s", proc_mounts
);
1586 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1587 if (strstr(line
, "debugfs") != NULL
) {
1588 /* Remove first string */
1590 /* Dup string here so we can reuse line later on */
1591 debugfs_path
= strdup(strtok(NULL
, " "));
1592 DBG("Got debugfs path : %s", debugfs_path
);
1599 /* Mount debugfs if needded */
1600 if (debugfs_path
== NULL
) {
1601 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1603 perror("asprintf debugfs path");
1606 ret
= mount_debugfs(debugfs_path
);
1608 perror("Cannot mount debugfs");
1613 /* Modprobe lttng kernel modules */
1614 ret
= modprobe_kernel_modules();
1619 /* Setup lttng kernel path */
1620 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1622 perror("asprintf lttng path");
1626 /* Open debugfs lttng */
1627 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1628 if (kernel_tracer_fd
< 0) {
1629 DBG("Failed to open %s", lttng_path
);
1635 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1645 WARN("No kernel tracer available");
1646 kernel_tracer_fd
= 0;
1651 * Init tracing by creating trace directory and sending fds kernel consumer.
1653 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1657 if (session
->consumer_fds_sent
== 0) {
1659 * Assign default kernel consumer socket if no consumer assigned to the
1660 * kernel session. At this point, it's NOT suppose to be 0 but this is
1661 * an extra security check.
1663 if (session
->consumer_fd
== 0) {
1664 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1667 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1669 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1673 session
->consumer_fds_sent
= 1;
1681 * Create an UST session and add it to the session ust list.
1683 static int create_ust_session(struct ltt_session
*session
,
1684 struct lttng_domain
*domain
)
1688 struct ltt_ust_session
*lus
= NULL
;
1690 switch (domain
->type
) {
1691 case LTTNG_DOMAIN_UST
:
1694 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1698 DBG("Creating UST session");
1700 session_lock_list();
1701 uid
= session_list_ptr
->count
;
1702 session_unlock_list();
1704 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1706 ret
= LTTCOMM_UST_SESS_FAIL
;
1710 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1711 geteuid(), allowed_group());
1713 if (ret
!= -EEXIST
) {
1714 ERR("Trace directory creation error");
1715 ret
= LTTCOMM_UST_SESS_FAIL
;
1720 /* The domain type dictate different actions on session creation */
1721 switch (domain
->type
) {
1722 case LTTNG_DOMAIN_UST
:
1723 /* No ustctl for the global UST domain */
1726 ERR("Unknown UST domain on create session %d", domain
->type
);
1729 session
->ust_session
= lus
;
1739 * Create a kernel tracer session then create the default channel.
1741 static int create_kernel_session(struct ltt_session
*session
)
1745 DBG("Creating kernel session");
1747 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1749 ret
= LTTCOMM_KERN_SESS_FAIL
;
1753 /* Set kernel consumer socket fd */
1754 if (kconsumer_data
.cmd_sock
) {
1755 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1758 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1759 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1761 if (ret
!= -EEXIST
) {
1762 ERR("Trace directory creation error");
1772 * Using the session list, filled a lttng_session array to send back to the
1773 * client for session listing.
1775 * The session list lock MUST be acquired before calling this function. Use
1776 * session_lock_list() and session_unlock_list().
1778 static void list_lttng_sessions(struct lttng_session
*sessions
)
1781 struct ltt_session
*session
;
1783 DBG("Getting all available session");
1785 * Iterate over session list and append data after the control struct in
1788 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1789 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1790 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1791 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1792 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1798 * Fill lttng_channel array of all channels.
1800 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1801 struct lttng_channel
*channels
)
1804 struct ltt_kernel_channel
*kchan
;
1806 DBG("Listing channels for session %s", session
->name
);
1809 case LTTNG_DOMAIN_KERNEL
:
1810 /* Kernel channels */
1811 if (session
->kernel_session
!= NULL
) {
1812 cds_list_for_each_entry(kchan
,
1813 &session
->kernel_session
->channel_list
.head
, list
) {
1814 /* Copy lttng_channel struct to array */
1815 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1816 channels
[i
].enabled
= kchan
->enabled
;
1821 case LTTNG_DOMAIN_UST
:
1823 struct cds_lfht_iter iter
;
1824 struct ltt_ust_channel
*uchan
;
1826 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1827 &iter
, uchan
, node
) {
1828 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1829 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1830 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1831 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1832 channels
[i
].attr
.switch_timer_interval
=
1833 uchan
->attr
.switch_timer_interval
;
1834 channels
[i
].attr
.read_timer_interval
=
1835 uchan
->attr
.read_timer_interval
;
1836 channels
[i
].attr
.output
= uchan
->attr
.output
;
1846 * Create a list of ust global domain events.
1848 static int list_lttng_ust_global_events(char *channel_name
,
1849 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1852 unsigned int nb_event
= 0;
1853 struct cds_lfht_iter iter
;
1854 struct ltt_ust_channel
*uchan
;
1855 struct ltt_ust_event
*uevent
;
1856 struct lttng_event
*tmp
;
1858 DBG("Listing UST global events for channel %s", channel_name
);
1862 /* Count events in all channels */
1863 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1864 nb_event
+= hashtable_get_count(uchan
->events
);
1867 if (nb_event
== 0) {
1872 DBG3("Listing UST global %d events", nb_event
);
1874 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1876 ret
= -LTTCOMM_FATAL
;
1880 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1881 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
1882 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
1883 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1884 tmp
[i
].enabled
= uevent
->enabled
;
1885 switch (uevent
->attr
.instrumentation
) {
1886 case LTTNG_UST_TRACEPOINT
:
1887 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1889 case LTTNG_UST_PROBE
:
1890 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
1892 case LTTNG_UST_FUNCTION
:
1893 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
1909 * Fill lttng_event array of all kernel events in the channel.
1911 static int list_lttng_kernel_events(char *channel_name
,
1912 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
1915 unsigned int nb_event
;
1916 struct ltt_kernel_event
*event
;
1917 struct ltt_kernel_channel
*kchan
;
1919 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
1920 if (kchan
== NULL
) {
1921 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1925 nb_event
= kchan
->event_count
;
1927 DBG("Listing events for channel %s", kchan
->channel
->name
);
1929 if (nb_event
== 0) {
1934 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1935 if (*events
== NULL
) {
1936 ret
= LTTCOMM_FATAL
;
1940 /* Kernel channels */
1941 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1942 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1943 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1944 (*events
)[i
].enabled
= event
->enabled
;
1945 switch (event
->event
->instrumentation
) {
1946 case LTTNG_KERNEL_TRACEPOINT
:
1947 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1949 case LTTNG_KERNEL_KPROBE
:
1950 case LTTNG_KERNEL_KRETPROBE
:
1951 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
1952 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1953 sizeof(struct lttng_kernel_kprobe
));
1955 case LTTNG_KERNEL_FUNCTION
:
1956 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
1957 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
1958 sizeof(struct lttng_kernel_function
));
1960 case LTTNG_KERNEL_NOOP
:
1961 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
1963 case LTTNG_KERNEL_SYSCALL
:
1964 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
1966 case LTTNG_KERNEL_ALL
:
1980 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1982 static int cmd_disable_channel(struct ltt_session
*session
,
1983 int domain
, char *channel_name
)
1988 case LTTNG_DOMAIN_KERNEL
:
1989 ret
= channel_kernel_disable(session
->kernel_session
,
1991 if (ret
!= LTTCOMM_OK
) {
1995 kernel_wait_quiescent(kernel_tracer_fd
);
1997 case LTTNG_DOMAIN_UST_PID
:
2000 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2011 * Copy channel from attributes and set it in the application channel list.
2014 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2015 struct lttng_channel *attr, struct ust_app *app)
2018 struct ltt_ust_channel *uchan, *new_chan;
2020 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2021 if (uchan == NULL) {
2022 ret = LTTCOMM_FATAL;
2026 new_chan = trace_ust_create_channel(attr, usess->path);
2027 if (new_chan == NULL) {
2028 PERROR("malloc ltt_ust_channel");
2029 ret = LTTCOMM_FATAL;
2033 ret = channel_ust_copy(new_chan, uchan);
2035 ret = LTTCOMM_FATAL;
2045 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2047 static int cmd_enable_channel(struct ltt_session
*session
,
2048 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
2051 struct ltt_ust_session
*usess
= session
->ust_session
;
2053 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2055 switch (domain
->type
) {
2056 case LTTNG_DOMAIN_KERNEL
:
2058 struct ltt_kernel_channel
*kchan
;
2060 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2061 session
->kernel_session
);
2062 if (kchan
== NULL
) {
2063 ret
= channel_kernel_create(session
->kernel_session
,
2064 attr
, kernel_poll_pipe
[1]);
2066 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2069 if (ret
!= LTTCOMM_OK
) {
2073 kernel_wait_quiescent(kernel_tracer_fd
);
2076 case LTTNG_DOMAIN_UST
:
2078 struct ltt_ust_channel
*uchan
;
2080 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2082 /* Get channel in global UST domain HT */
2083 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2085 if (uchan
== NULL
) {
2086 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2087 if (uchan
== NULL
) {
2088 ret
= LTTCOMM_UST_CHAN_FAIL
;
2093 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2095 DBG2("UST channel %s added to global domain HT", attr
->name
);
2097 ret
= LTTCOMM_UST_CHAN_EXIST
;
2101 /* Add channel to all registered applications */
2102 ret
= ust_app_create_channel_all(usess
, uchan
);
2111 case LTTNG_DOMAIN_UST_PID
:
2115 struct ltt_ust_channel *uchan;
2116 struct ltt_ust_session *usess;
2117 struct ust_app *app;
2119 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2121 if (usess == NULL) {
2122 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2126 app = ust_app_get_by_pid(domain->attr.pid);
2128 ret = LTTCOMM_APP_NOT_FOUND;
2133 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2134 if (uchan == NULL) {
2135 ret = channel_ust_create(usess, attr, sock);
2137 ret = channel_ust_enable(usess, uchan, sock);
2140 if (ret != LTTCOMM_OK) {
2144 ret = copy_ust_channel_to_app(usess, attr, app);
2145 if (ret != LTTCOMM_OK) {
2149 DBG("UST channel %s created for app sock %d with pid %d",
2150 attr->name, app->sock, domain->attr.pid);
2152 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2156 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2167 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2169 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2170 char *channel_name
, char *event_name
)
2175 case LTTNG_DOMAIN_KERNEL
:
2177 struct ltt_kernel_channel
*kchan
;
2179 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2180 session
->kernel_session
);
2181 if (kchan
== NULL
) {
2182 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2186 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2187 if (ret
!= LTTCOMM_OK
) {
2191 kernel_wait_quiescent(kernel_tracer_fd
);
2194 case LTTNG_DOMAIN_UST
:
2195 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2196 case LTTNG_DOMAIN_UST_PID
:
2197 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2199 /* TODO: Other UST domains */
2200 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2211 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2213 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2217 struct ltt_kernel_channel
*kchan
;
2220 case LTTNG_DOMAIN_KERNEL
:
2221 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2222 session
->kernel_session
);
2223 if (kchan
== NULL
) {
2224 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2228 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2229 if (ret
!= LTTCOMM_OK
) {
2233 kernel_wait_quiescent(kernel_tracer_fd
);
2236 /* TODO: Userspace tracing */
2237 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2248 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2250 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2251 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2256 case LTTNG_DOMAIN_KERNEL
:
2257 /* Add kernel context to kernel tracer */
2258 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2259 event_name
, channel_name
);
2260 if (ret
!= LTTCOMM_OK
) {
2264 case LTTNG_DOMAIN_UST
:
2267 struct ltt_ust_session *usess;
2269 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2270 ret = context_ust_add(usess, ctx,
2271 event_name, channel_name, domain);
2272 if (ret != LTTCOMM_OK) {
2280 /* TODO: UST other domains */
2281 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2292 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2294 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2295 char *channel_name
, struct lttng_event
*event
)
2298 struct lttng_channel
*attr
;
2299 struct ltt_ust_session
*usess
= session
->ust_session
;
2302 case LTTNG_DOMAIN_KERNEL
:
2304 struct ltt_kernel_channel
*kchan
;
2306 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2307 session
->kernel_session
);
2308 if (kchan
== NULL
) {
2309 attr
= channel_new_default_attr(domain
);
2311 ret
= LTTCOMM_FATAL
;
2314 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2316 /* This call will notify the kernel thread */
2317 ret
= channel_kernel_create(session
->kernel_session
,
2318 attr
, kernel_poll_pipe
[1]);
2319 if (ret
!= LTTCOMM_OK
) {
2324 /* Get the newly created kernel channel pointer */
2325 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2326 session
->kernel_session
);
2327 if (kchan
== NULL
) {
2328 /* This sould not happen... */
2329 ret
= LTTCOMM_FATAL
;
2333 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2335 if (ret
!= LTTCOMM_OK
) {
2339 kernel_wait_quiescent(kernel_tracer_fd
);
2342 case LTTNG_DOMAIN_UST
:
2344 struct ltt_ust_channel
*uchan
;
2345 struct ltt_ust_event
*uevent
;
2347 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2349 if (uchan
== NULL
) {
2350 /* TODO: Create default channel */
2351 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2355 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2356 if (uevent
== NULL
) {
2357 uevent
= trace_ust_create_event(event
);
2358 if (uevent
== NULL
) {
2359 ret
= LTTCOMM_FATAL
;
2365 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2367 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2371 /* Add ltt ust event to channel */
2373 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2376 uevent
->enabled
= 1;
2378 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
2382 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2383 case LTTNG_DOMAIN_UST_PID
:
2384 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2386 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2397 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2399 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2400 char *channel_name
, int event_type
)
2403 struct ltt_kernel_channel
*kchan
;
2406 case LTTNG_DOMAIN_KERNEL
:
2407 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2408 session
->kernel_session
);
2409 if (kchan
== NULL
) {
2410 /* This call will notify the kernel thread */
2411 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2412 kernel_poll_pipe
[1]);
2413 if (ret
!= LTTCOMM_OK
) {
2418 /* Get the newly created kernel channel pointer */
2419 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2420 session
->kernel_session
);
2421 if (kchan
== NULL
) {
2422 /* This sould not happen... */
2423 ret
= LTTCOMM_FATAL
;
2427 switch (event_type
) {
2428 case LTTNG_KERNEL_SYSCALL
:
2429 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2430 kchan
, kernel_tracer_fd
);
2432 case LTTNG_KERNEL_TRACEPOINT
:
2434 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2435 * events already registered to the channel.
2437 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2438 kchan
, kernel_tracer_fd
);
2440 case LTTNG_KERNEL_ALL
:
2441 /* Enable syscalls and tracepoints */
2442 ret
= event_kernel_enable_all(session
->kernel_session
,
2443 kchan
, kernel_tracer_fd
);
2446 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2449 if (ret
!= LTTCOMM_OK
) {
2453 kernel_wait_quiescent(kernel_tracer_fd
);
2456 /* TODO: Userspace tracing */
2457 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2468 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2470 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2473 ssize_t nb_events
= 0;
2476 case LTTNG_DOMAIN_KERNEL
:
2477 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2478 if (nb_events
< 0) {
2479 ret
= LTTCOMM_KERN_LIST_FAIL
;
2483 case LTTNG_DOMAIN_UST
:
2484 nb_events
= ust_app_list_events(events
);
2485 if (nb_events
< 0) {
2486 ret
= LTTCOMM_UST_LIST_FAIL
;
2491 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2498 /* Return negative value to differentiate return code */
2503 * Command LTTNG_START_TRACE processed by the client thread.
2505 static int cmd_start_trace(struct ltt_session
*session
)
2508 struct ltt_kernel_session
*ksession
;
2509 struct ltt_ust_session
*usess
;
2512 ksession
= session
->kernel_session
;
2513 usess
= session
->ust_session
;
2515 /* Kernel tracing */
2516 if (ksession
!= NULL
) {
2517 struct ltt_kernel_channel
*kchan
;
2519 /* Open kernel metadata */
2520 if (ksession
->metadata
== NULL
) {
2521 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2523 ret
= LTTCOMM_KERN_META_FAIL
;
2528 /* Open kernel metadata stream */
2529 if (ksession
->metadata_stream_fd
== 0) {
2530 ret
= kernel_open_metadata_stream(ksession
);
2532 ERR("Kernel create metadata stream failed");
2533 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2538 /* For each channel */
2539 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2540 if (kchan
->stream_count
== 0) {
2541 ret
= kernel_open_channel_stream(kchan
);
2543 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2546 /* Update the stream global counter */
2547 ksession
->stream_count_global
+= ret
;
2551 /* Setup kernel consumer socket and send fds to it */
2552 ret
= init_kernel_tracing(ksession
);
2554 ret
= LTTCOMM_KERN_START_FAIL
;
2558 /* This start the kernel tracing */
2559 ret
= kernel_start_session(ksession
);
2561 ret
= LTTCOMM_KERN_START_FAIL
;
2565 /* Quiescent wait after starting trace */
2566 kernel_wait_quiescent(kernel_tracer_fd
);
2569 /* Flag session that trace should start automatically */
2571 usess
->start_trace
= 1;
2573 ret
= ust_app_start_trace_all(usess
);
2575 ret
= LTTCOMM_UST_START_FAIL
;
2587 * Command LTTNG_STOP_TRACE processed by the client thread.
2589 static int cmd_stop_trace(struct ltt_session
*session
)
2592 struct ltt_kernel_channel
*kchan
;
2593 struct ltt_kernel_session
*ksession
;
2594 //struct ltt_ust_session *usess;
2595 //struct ltt_ust_channel *ustchan;
2598 ksession
= session
->kernel_session
;
2601 if (ksession
!= NULL
) {
2602 DBG("Stop kernel tracing");
2604 /* Flush all buffers before stopping */
2605 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2607 ERR("Kernel metadata flush failed");
2610 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2611 ret
= kernel_flush_buffer(kchan
);
2613 ERR("Kernel flush buffer error");
2617 ret
= kernel_stop_session(ksession
);
2619 ret
= LTTCOMM_KERN_STOP_FAIL
;
2623 kernel_wait_quiescent(kernel_tracer_fd
);
2627 /* Stop each UST session */
2628 DBG("Stop UST tracing");
2629 cds_list_for_each_entry(usess
, &session
->ust_session_list
.head
, list
) {
2630 /* Flush all buffers before stopping */
2631 ret
= ustctl_flush_buffer(usess
->sock
, usess
->metadata
->obj
);
2633 ERR("UST metadata flush failed");
2636 cds_list_for_each_entry(ustchan
, &usess
->channels
.head
, list
) {
2637 ret
= ustctl_flush_buffer(usess
->sock
, ustchan
->obj
);
2639 ERR("UST flush buffer error");
2643 ret
= ustctl_stop_session(usess
->sock
, usess
->handle
);
2645 ret
= LTTCOMM_KERN_STOP_FAIL
;
2649 ustctl_wait_quiescent(usess
->sock
);
2660 * Command LTTNG_CREATE_SESSION processed by the client thread.
2662 static int cmd_create_session(char *name
, char *path
)
2666 ret
= session_create(name
, path
);
2667 if (ret
!= LTTCOMM_OK
) {
2678 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2680 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2684 /* Clean kernel session teardown */
2685 teardown_kernel_session(session
);
2688 * Must notify the kernel thread here to update it's poll setin order
2689 * to remove the channel(s)' fd just destroyed.
2691 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2693 perror("write kernel poll pipe");
2696 ret
= session_destroy(session
);
2702 * Command LTTNG_CALIBRATE processed by the client thread.
2704 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2709 case LTTNG_DOMAIN_KERNEL
:
2711 struct lttng_kernel_calibrate kcalibrate
;
2713 kcalibrate
.type
= calibrate
->type
;
2714 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2716 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2722 /* TODO: Userspace tracing */
2723 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2734 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2736 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2742 case LTTNG_DOMAIN_KERNEL
:
2743 /* Can't register a consumer if there is already one */
2744 if (session
->kernel_session
->consumer_fd
!= 0) {
2745 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2749 sock
= lttcomm_connect_unix_sock(sock_path
);
2751 ret
= LTTCOMM_CONNECT_FAIL
;
2755 session
->kernel_session
->consumer_fd
= sock
;
2758 /* TODO: Userspace tracing */
2759 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2770 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2772 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2773 struct lttng_domain
**domains
)
2778 if (session
->kernel_session
!= NULL
) {
2779 DBG3("Listing domains found kernel domain");
2783 if (session
->ust_session
!= NULL
) {
2784 DBG3("Listing domains found UST global domain");
2788 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2789 if (*domains
== NULL
) {
2790 ret
= -LTTCOMM_FATAL
;
2794 if (session
->kernel_session
!= NULL
) {
2795 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2799 if (session
->ust_session
!= NULL
) {
2800 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2811 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2813 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2814 struct lttng_channel
**channels
)
2817 ssize_t nb_chan
= 0;
2820 case LTTNG_DOMAIN_KERNEL
:
2821 if (session
->kernel_session
!= NULL
) {
2822 nb_chan
= session
->kernel_session
->channel_count
;
2824 DBG3("Number of kernel channels %ld", nb_chan
);
2826 case LTTNG_DOMAIN_UST
:
2827 if (session
->ust_session
!= NULL
) {
2828 nb_chan
= hashtable_get_count(
2829 session
->ust_session
->domain_global
.channels
);
2831 DBG3("Number of UST global channels %ld", nb_chan
);
2835 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2840 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2841 if (*channels
== NULL
) {
2842 ret
= -LTTCOMM_FATAL
;
2846 list_lttng_channels(domain
, session
, *channels
);
2858 * Command LTTNG_LIST_EVENTS processed by the client thread.
2860 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2861 char *channel_name
, struct lttng_event
**events
)
2864 ssize_t nb_event
= 0;
2867 case LTTNG_DOMAIN_KERNEL
:
2868 if (session
->kernel_session
!= NULL
) {
2869 nb_event
= list_lttng_kernel_events(channel_name
,
2870 session
->kernel_session
, events
);
2873 case LTTNG_DOMAIN_UST
:
2875 if (session
->ust_session
!= NULL
) {
2876 nb_event
= list_lttng_ust_global_events(channel_name
,
2877 &session
->ust_session
->domain_global
, events
);
2882 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2893 * Process the command requested by the lttng client within the command
2894 * context structure. This function make sure that the return structure (llm)
2895 * is set and ready for transmission before returning.
2897 * Return any error encountered or 0 for success.
2899 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2901 int ret
= LTTCOMM_OK
;
2902 int need_tracing_session
= 1;
2904 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2907 * Check for command that don't needs to allocate a returned payload. We do
2908 * this here so we don't have to make the call for no payload at each
2911 switch(cmd_ctx
->lsm
->cmd_type
) {
2912 case LTTNG_LIST_SESSIONS
:
2913 case LTTNG_LIST_TRACEPOINTS
:
2914 case LTTNG_LIST_DOMAINS
:
2915 case LTTNG_LIST_CHANNELS
:
2916 case LTTNG_LIST_EVENTS
:
2919 /* Setup lttng message with no payload */
2920 ret
= setup_lttng_msg(cmd_ctx
, 0);
2922 /* This label does not try to unlock the session */
2923 goto init_setup_error
;
2927 /* Commands that DO NOT need a session. */
2928 switch (cmd_ctx
->lsm
->cmd_type
) {
2929 case LTTNG_CALIBRATE
:
2930 case LTTNG_CREATE_SESSION
:
2931 case LTTNG_LIST_SESSIONS
:
2932 case LTTNG_LIST_TRACEPOINTS
:
2933 need_tracing_session
= 0;
2936 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2937 session_lock_list();
2938 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2939 session_unlock_list();
2940 if (cmd_ctx
->session
== NULL
) {
2941 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2942 ret
= LTTCOMM_SESS_NOT_FOUND
;
2944 /* If no session name specified */
2945 ret
= LTTCOMM_SELECT_SESS
;
2949 /* Acquire lock for the session */
2950 session_lock(cmd_ctx
->session
);
2956 * Check domain type for specific "pre-action".
2958 switch (cmd_ctx
->lsm
->domain
.type
) {
2959 case LTTNG_DOMAIN_KERNEL
:
2960 /* Kernel tracer check */
2961 if (kernel_tracer_fd
== 0) {
2962 /* Basically, load kernel tracer modules */
2963 init_kernel_tracer();
2964 if (kernel_tracer_fd
== 0) {
2965 ret
= LTTCOMM_KERN_NA
;
2970 /* Need a session for kernel command */
2971 if (need_tracing_session
) {
2972 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2973 ret
= create_kernel_session(cmd_ctx
->session
);
2975 ret
= LTTCOMM_KERN_SESS_FAIL
;
2980 /* Start the kernel consumer daemon */
2981 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2982 if (kconsumer_data
.pid
== 0 &&
2983 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2984 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2985 ret
= start_consumerd(&kconsumer_data
);
2987 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2991 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2994 case LTTNG_DOMAIN_UST
:
2996 if (need_tracing_session
) {
2997 if (cmd_ctx
->session
->ust_session
== NULL
) {
2998 ret
= create_ust_session(cmd_ctx
->session
,
2999 &cmd_ctx
->lsm
->domain
);
3000 if (ret
!= LTTCOMM_OK
) {
3004 /* Start the kernel consumer daemon */
3005 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
3006 if (ustconsumer_data
.pid
== 0 &&
3007 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3008 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3009 ret
= start_consumerd(&ustconsumer_data
);
3011 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3015 ust_consumer_fd
= ustconsumer_data
.cmd_sock
;
3017 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3025 /* Process by command type */
3026 switch (cmd_ctx
->lsm
->cmd_type
) {
3027 case LTTNG_ADD_CONTEXT
:
3029 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3030 cmd_ctx
->lsm
->u
.context
.channel_name
,
3031 cmd_ctx
->lsm
->u
.context
.event_name
,
3032 &cmd_ctx
->lsm
->u
.context
.ctx
);
3035 case LTTNG_DISABLE_CHANNEL
:
3037 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3038 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3041 case LTTNG_DISABLE_EVENT
:
3043 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3044 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3045 cmd_ctx
->lsm
->u
.disable
.name
);
3049 case LTTNG_DISABLE_ALL_EVENT
:
3051 DBG("Disabling all events");
3053 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3054 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3057 case LTTNG_ENABLE_CHANNEL
:
3059 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3060 &cmd_ctx
->lsm
->u
.channel
.chan
);
3063 case LTTNG_ENABLE_EVENT
:
3065 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3066 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3067 &cmd_ctx
->lsm
->u
.enable
.event
);
3070 case LTTNG_ENABLE_ALL_EVENT
:
3072 DBG("Enabling all events");
3074 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3075 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3076 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3079 case LTTNG_LIST_TRACEPOINTS
:
3081 struct lttng_event
*events
;
3084 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3085 if (nb_events
< 0) {
3091 * Setup lttng message with payload size set to the event list size in
3092 * bytes and then copy list into the llm payload.
3094 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3100 /* Copy event list into message payload */
3101 memcpy(cmd_ctx
->llm
->payload
, events
,
3102 sizeof(struct lttng_event
) * nb_events
);
3109 case LTTNG_START_TRACE
:
3111 ret
= cmd_start_trace(cmd_ctx
->session
);
3114 case LTTNG_STOP_TRACE
:
3116 ret
= cmd_stop_trace(cmd_ctx
->session
);
3119 case LTTNG_CREATE_SESSION
:
3121 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3122 cmd_ctx
->lsm
->session
.path
);
3125 case LTTNG_DESTROY_SESSION
:
3127 ret
= cmd_destroy_session(cmd_ctx
->session
,
3128 cmd_ctx
->lsm
->session
.name
);
3131 case LTTNG_LIST_DOMAINS
:
3134 struct lttng_domain
*domains
;
3136 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3142 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3147 /* Copy event list into message payload */
3148 memcpy(cmd_ctx
->llm
->payload
, domains
,
3149 nb_dom
* sizeof(struct lttng_domain
));
3156 case LTTNG_LIST_CHANNELS
:
3159 struct lttng_channel
*channels
;
3161 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3162 cmd_ctx
->session
, &channels
);
3168 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3173 /* Copy event list into message payload */
3174 memcpy(cmd_ctx
->llm
->payload
, channels
,
3175 nb_chan
* sizeof(struct lttng_channel
));
3182 case LTTNG_LIST_EVENTS
:
3185 struct lttng_event
*events
= NULL
;
3187 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3188 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3194 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3199 /* Copy event list into message payload */
3200 memcpy(cmd_ctx
->llm
->payload
, events
,
3201 nb_event
* sizeof(struct lttng_event
));
3208 case LTTNG_LIST_SESSIONS
:
3210 session_lock_list();
3212 if (session_list_ptr
->count
== 0) {
3213 ret
= LTTCOMM_NO_SESSION
;
3214 session_unlock_list();
3218 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3219 session_list_ptr
->count
);
3221 session_unlock_list();
3225 /* Filled the session array */
3226 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3228 session_unlock_list();
3233 case LTTNG_CALIBRATE
:
3235 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3236 &cmd_ctx
->lsm
->u
.calibrate
);
3239 case LTTNG_REGISTER_CONSUMER
:
3241 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3242 cmd_ctx
->lsm
->u
.reg
.path
);
3251 if (cmd_ctx
->llm
== NULL
) {
3252 DBG("Missing llm structure. Allocating one.");
3253 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3257 /* Set return code */
3258 cmd_ctx
->llm
->ret_code
= ret
;
3260 if (cmd_ctx
->session
) {
3261 session_unlock(cmd_ctx
->session
);
3268 * This thread manage all clients request using the unix client socket for
3271 static void *thread_manage_clients(void *data
)
3273 int sock
= 0, ret
, i
, pollfd
;
3274 uint32_t revents
, nb_fd
;
3275 struct command_ctx
*cmd_ctx
= NULL
;
3276 struct lttng_poll_event events
;
3278 DBG("[thread] Manage client started");
3280 rcu_register_thread();
3282 ret
= lttcomm_listen_unix_sock(client_sock
);
3288 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3289 * more will be added to this poll set.
3291 ret
= create_thread_poll_set(&events
, 2);
3296 /* Add the application registration socket */
3297 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3303 * Notify parent pid that we are ready to accept command for client side.
3305 if (opt_sig_parent
) {
3306 kill(ppid
, SIGCHLD
);
3310 DBG("Accepting client command ...");
3312 nb_fd
= LTTNG_POLL_GETNB(&events
);
3314 /* Inifinite blocking call, waiting for transmission */
3315 ret
= lttng_poll_wait(&events
, -1);
3320 for (i
= 0; i
< nb_fd
; i
++) {
3321 /* Fetch once the poll data */
3322 revents
= LTTNG_POLL_GETEV(&events
, i
);
3323 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3325 /* Thread quit pipe has been closed. Killing thread. */
3326 ret
= check_thread_quit_pipe(pollfd
, revents
);
3331 /* Event on the registration socket */
3332 if (pollfd
== client_sock
) {
3333 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3334 ERR("Client socket poll error");
3340 DBG("Wait for client response");
3342 sock
= lttcomm_accept_unix_sock(client_sock
);
3347 /* Allocate context command to process the client request */
3348 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3349 if (cmd_ctx
== NULL
) {
3350 perror("zmalloc cmd_ctx");
3354 /* Allocate data buffer for reception */
3355 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3356 if (cmd_ctx
->lsm
== NULL
) {
3357 perror("zmalloc cmd_ctx->lsm");
3361 cmd_ctx
->llm
= NULL
;
3362 cmd_ctx
->session
= NULL
;
3365 * Data is received from the lttng client. The struct
3366 * lttcomm_session_msg (lsm) contains the command and data request of
3369 DBG("Receiving data from client ...");
3370 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3371 sizeof(struct lttcomm_session_msg
));
3373 DBG("Nothing recv() from client... continuing");
3379 // TODO: Validate cmd_ctx including sanity check for
3380 // security purpose.
3382 rcu_thread_online();
3384 * This function dispatch the work to the kernel or userspace tracer
3385 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3386 * informations for the client. The command context struct contains
3387 * everything this function may needs.
3389 ret
= process_client_msg(cmd_ctx
);
3390 rcu_thread_offline();
3393 * TODO: Inform client somehow of the fatal error. At
3394 * this point, ret < 0 means that a zmalloc failed
3395 * (ENOMEM). Error detected but still accept command.
3397 clean_command_ctx(&cmd_ctx
);
3401 DBG("Sending response (size: %d, retcode: %s)",
3402 cmd_ctx
->lttng_msg_size
,
3403 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3404 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3406 ERR("Failed to send data back to client");
3409 clean_command_ctx(&cmd_ctx
);
3411 /* End of transmission */
3416 DBG("Client thread dying");
3417 unlink(client_unix_sock_path
);
3421 lttng_poll_clean(&events
);
3422 clean_command_ctx(&cmd_ctx
);
3424 rcu_unregister_thread();
3430 * usage function on stderr
3432 static void usage(void)
3434 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3435 fprintf(stderr
, " -h, --help Display this usage.\n");
3436 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3437 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3438 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3439 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3440 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3441 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3442 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3443 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3444 fprintf(stderr
, " -V, --version Show version number.\n");
3445 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3446 fprintf(stderr
, " -q, --quiet No output at all.\n");
3447 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3448 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3452 * daemon argument parsing
3454 static int parse_args(int argc
, char **argv
)
3458 static struct option long_options
[] = {
3459 { "client-sock", 1, 0, 'c' },
3460 { "apps-sock", 1, 0, 'a' },
3461 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3462 { "kconsumerd-err-sock", 1, 0, 'E' },
3463 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3464 { "ustconsumerd-err-sock", 1, 0, 'F' },
3465 { "daemonize", 0, 0, 'd' },
3466 { "sig-parent", 0, 0, 'S' },
3467 { "help", 0, 0, 'h' },
3468 { "group", 1, 0, 'g' },
3469 { "version", 0, 0, 'V' },
3470 { "quiet", 0, 0, 'q' },
3471 { "verbose", 0, 0, 'v' },
3472 { "verbose-consumer", 0, 0, 'Z' },
3477 int option_index
= 0;
3478 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
3479 long_options
, &option_index
);
3486 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3488 fprintf(stderr
, " with arg %s\n", optarg
);
3492 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3495 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3501 opt_tracing_group
= strdup(optarg
);
3507 fprintf(stdout
, "%s\n", VERSION
);
3513 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3516 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3519 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3522 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3528 /* Verbose level can increase using multiple -v */
3532 opt_verbose_consumer
+= 1;
3535 /* Unknown option or other error.
3536 * Error is printed by getopt, just return */
3545 * Creates the two needed socket by the daemon.
3546 * apps_sock - The communication socket for all UST apps.
3547 * client_sock - The communication of the cli tool (lttng).
3549 static int init_daemon_socket(void)
3554 old_umask
= umask(0);
3556 /* Create client tool unix socket */
3557 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3558 if (client_sock
< 0) {
3559 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3564 /* File permission MUST be 660 */
3565 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3567 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3572 /* Create the application unix socket */
3573 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3574 if (apps_sock
< 0) {
3575 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3580 /* File permission MUST be 666 */
3581 ret
= chmod(apps_unix_sock_path
,
3582 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3584 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3595 * Check if the global socket is available, and if a daemon is answering at the
3596 * other side. If yes, error is returned.
3598 static int check_existing_daemon(void)
3600 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3601 access(apps_unix_sock_path
, F_OK
) < 0) {
3605 /* Is there anybody out there ? */
3606 if (lttng_session_daemon_alive()) {
3614 * Set the tracing group gid onto the client socket.
3616 * Race window between mkdir and chown is OK because we are going from more
3617 * permissive (root.root) to les permissive (root.tracing).
3619 static int set_permissions(void)
3624 gid
= allowed_group();
3627 WARN("No tracing group detected");
3630 ERR("Missing tracing group. Aborting execution.");
3636 /* Set lttng run dir */
3637 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3639 ERR("Unable to set group on " LTTNG_RUNDIR
);
3643 /* lttng client socket path */
3644 ret
= chown(client_unix_sock_path
, 0, gid
);
3646 ERR("Unable to set group on %s", client_unix_sock_path
);
3650 /* kconsumer error socket path */
3651 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3653 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3657 /* ustconsumer error socket path */
3658 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3660 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3664 DBG("All permissions are set");
3671 * Create the pipe used to wake up the kernel thread.
3673 static int create_kernel_poll_pipe(void)
3675 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3679 * Create the application command pipe to wake thread_manage_apps.
3681 static int create_apps_cmd_pipe(void)
3683 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3687 * Create the lttng run directory needed for all global sockets and pipe.
3689 static int create_lttng_rundir(void)
3693 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3695 if (errno
!= EEXIST
) {
3696 ERR("Unable to create " LTTNG_RUNDIR
);
3708 * Setup sockets and directory needed by the kconsumerd communication with the
3711 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3714 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3715 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3717 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3718 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3719 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3720 KCONSUMERD_ERR_SOCK_PATH
:
3721 USTCONSUMERD_ERR_SOCK_PATH
);
3724 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3725 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3726 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3727 KCONSUMERD_CMD_SOCK_PATH
:
3728 USTCONSUMERD_CMD_SOCK_PATH
);
3731 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3733 if (errno
!= EEXIST
) {
3734 ERR("Failed to create %s", path
);
3740 /* Create the kconsumerd error unix socket */
3741 consumer_data
->err_sock
=
3742 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3743 if (consumer_data
->err_sock
< 0) {
3744 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3749 /* File permission MUST be 660 */
3750 ret
= chmod(consumer_data
->err_unix_sock_path
,
3751 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3753 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3763 * Signal handler for the daemon
3765 * Simply stop all worker threads, leaving main() return gracefully after
3766 * joining all threads and calling cleanup().
3768 static void sighandler(int sig
)
3772 DBG("SIGPIPE catched");
3775 DBG("SIGINT catched");
3779 DBG("SIGTERM catched");
3788 * Setup signal handler for :
3789 * SIGINT, SIGTERM, SIGPIPE
3791 static int set_signal_handler(void)
3794 struct sigaction sa
;
3797 if ((ret
= sigemptyset(&sigset
)) < 0) {
3798 perror("sigemptyset");
3802 sa
.sa_handler
= sighandler
;
3803 sa
.sa_mask
= sigset
;
3805 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3806 perror("sigaction");
3810 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3811 perror("sigaction");
3815 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3816 perror("sigaction");
3820 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3826 * Set open files limit to unlimited. This daemon can open a large number of
3827 * file descriptors in order to consumer multiple kernel traces.
3829 static void set_ulimit(void)
3834 /* The kernel does not allowed an infinite limit for open files */
3835 lim
.rlim_cur
= 65535;
3836 lim
.rlim_max
= 65535;
3838 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3840 perror("failed to set open files limit");
3847 int main(int argc
, char **argv
)
3851 const char *home_path
;
3853 rcu_register_thread();
3855 /* Create thread quit pipe */
3856 if ((ret
= init_thread_quit_pipe()) < 0) {
3860 /* Parse arguments */
3862 if ((ret
= parse_args(argc
, argv
) < 0)) {
3875 /* Check if daemon is UID = 0 */
3876 is_root
= !getuid();
3879 ret
= create_lttng_rundir();
3884 if (strlen(apps_unix_sock_path
) == 0) {
3885 snprintf(apps_unix_sock_path
, PATH_MAX
,
3886 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3889 if (strlen(client_unix_sock_path
) == 0) {
3890 snprintf(client_unix_sock_path
, PATH_MAX
,
3891 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3894 /* Set global SHM for ust */
3895 if (strlen(wait_shm_path
) == 0) {
3896 snprintf(wait_shm_path
, PATH_MAX
,
3897 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3900 home_path
= get_home_dir();
3901 if (home_path
== NULL
) {
3902 /* TODO: Add --socket PATH option */
3903 ERR("Can't get HOME directory for sockets creation.");
3908 if (strlen(apps_unix_sock_path
) == 0) {
3909 snprintf(apps_unix_sock_path
, PATH_MAX
,
3910 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3913 /* Set the cli tool unix socket path */
3914 if (strlen(client_unix_sock_path
) == 0) {
3915 snprintf(client_unix_sock_path
, PATH_MAX
,
3916 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3919 /* Set global SHM for ust */
3920 if (strlen(wait_shm_path
) == 0) {
3921 snprintf(wait_shm_path
, PATH_MAX
,
3922 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3926 DBG("Client socket path %s", client_unix_sock_path
);
3927 DBG("Application socket path %s", apps_unix_sock_path
);
3930 * See if daemon already exist.
3932 if ((ret
= check_existing_daemon()) < 0) {
3933 ERR("Already running daemon.\n");
3935 * We do not goto exit because we must not cleanup()
3936 * because a daemon is already running.
3941 /* After this point, we can safely call cleanup() with "goto exit" */
3944 * These actions must be executed as root. We do that *after* setting up
3945 * the sockets path because we MUST make the check for another daemon using
3946 * those paths *before* trying to set the kernel consumer sockets and init
3950 ret
= set_consumer_sockets(&kconsumer_data
);
3955 ret
= set_consumer_sockets(&ustconsumer_data
);
3959 /* Setup kernel tracer */
3960 init_kernel_tracer();
3962 /* Set ulimit for open files */
3966 if ((ret
= set_signal_handler()) < 0) {
3970 /* Setup the needed unix socket */
3971 if ((ret
= init_daemon_socket()) < 0) {
3975 /* Set credentials to socket */
3976 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3980 /* Get parent pid if -S, --sig-parent is specified. */
3981 if (opt_sig_parent
) {
3985 /* Setup the kernel pipe for waking up the kernel thread */
3986 if ((ret
= create_kernel_poll_pipe()) < 0) {
3990 /* Setup the thread apps communication pipe. */
3991 if ((ret
= create_apps_cmd_pipe()) < 0) {
3995 /* Init UST command queue. */
3996 cds_wfq_init(&ust_cmd_queue
.queue
);
3998 /* Init UST app hash table */
4002 * Get session list pointer. This pointer MUST NOT be free(). This list is
4003 * statically declared in session.c
4005 session_list_ptr
= session_get_list();
4007 /* Set up max poll set size */
4008 lttng_poll_set_max_size();
4010 /* Create thread to manage the client socket */
4011 ret
= pthread_create(&client_thread
, NULL
,
4012 thread_manage_clients
, (void *) NULL
);
4014 perror("pthread_create clients");
4018 /* Create thread to dispatch registration */
4019 ret
= pthread_create(&dispatch_thread
, NULL
,
4020 thread_dispatch_ust_registration
, (void *) NULL
);
4022 perror("pthread_create dispatch");
4026 /* Create thread to manage application registration. */
4027 ret
= pthread_create(®_apps_thread
, NULL
,
4028 thread_registration_apps
, (void *) NULL
);
4030 perror("pthread_create registration");
4034 /* Create thread to manage application socket */
4035 ret
= pthread_create(&apps_thread
, NULL
,
4036 thread_manage_apps
, (void *) NULL
);
4038 perror("pthread_create apps");
4042 /* Create kernel thread to manage kernel event */
4043 ret
= pthread_create(&kernel_thread
, NULL
,
4044 thread_manage_kernel
, (void *) NULL
);
4046 perror("pthread_create kernel");
4050 ret
= pthread_join(kernel_thread
, &status
);
4052 perror("pthread_join");
4053 goto error
; /* join error, exit without cleanup */
4057 ret
= pthread_join(apps_thread
, &status
);
4059 perror("pthread_join");
4060 goto error
; /* join error, exit without cleanup */
4064 ret
= pthread_join(reg_apps_thread
, &status
);
4066 perror("pthread_join");
4067 goto error
; /* join error, exit without cleanup */
4071 ret
= pthread_join(dispatch_thread
, &status
);
4073 perror("pthread_join");
4074 goto error
; /* join error, exit without cleanup */
4078 ret
= pthread_join(client_thread
, &status
);
4080 perror("pthread_join");
4081 goto error
; /* join error, exit without cleanup */
4084 ret
= join_consumer_thread(&kconsumer_data
);
4086 perror("join_consumer");
4087 goto error
; /* join error, exit without cleanup */
4093 * cleanup() is called when no other thread is running.
4095 rcu_thread_online();
4097 rcu_thread_offline();
4098 rcu_unregister_thread();