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
)
310 DBG("Tearing down UST session(s)");
312 ret
= ust_app_destroy_trace_all(session
->ust_session
);
314 ERR("Error in ust_app_destroy_trace_all");
316 trace_ust_destroy_session(session
->ust_session
);
320 * Stop all threads by closing the thread quit pipe.
322 static void stop_threads(void)
326 /* Stopping all threads */
327 DBG("Terminating all threads");
328 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
330 ERR("write error on thread quit pipe");
333 /* Dispatch thread */
334 dispatch_thread_exit
= 1;
335 futex_nto1_wake(&ust_cmd_queue
.futex
);
341 static void cleanup(void)
345 struct ltt_session
*sess
, *stmp
;
350 DBG("Removing %s directory", LTTNG_RUNDIR
);
351 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
353 ERR("asprintf failed. Something is really wrong!");
356 /* Remove lttng run directory */
359 ERR("Unable to clean " LTTNG_RUNDIR
);
363 DBG("Cleaning up all session");
365 /* Destroy session list mutex */
366 if (session_list_ptr
!= NULL
) {
367 pthread_mutex_destroy(&session_list_ptr
->lock
);
369 /* Cleanup ALL session */
370 cds_list_for_each_entry_safe(sess
, stmp
,
371 &session_list_ptr
->head
, list
) {
372 teardown_kernel_session(sess
);
373 teardown_ust_session(sess
);
378 DBG("Closing all UST sockets");
379 ust_app_clean_list();
381 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
383 DBG("Closing kernel fd");
384 close(kernel_tracer_fd
);
387 DBG("Unloading kernel modules");
388 modprobe_remove_kernel_modules();
391 close(thread_quit_pipe
[0]);
392 close(thread_quit_pipe
[1]);
395 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
396 "Matthew, BEET driven development works!%c[%dm",
397 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
402 * Send data on a unix socket using the liblttsessiondcomm API.
404 * Return lttcomm error code.
406 static int send_unix_sock(int sock
, void *buf
, size_t len
)
408 /* Check valid length */
413 return lttcomm_send_unix_sock(sock
, buf
, len
);
417 * Free memory of a command context structure.
419 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
421 DBG("Clean command context structure");
423 if ((*cmd_ctx
)->llm
) {
424 free((*cmd_ctx
)->llm
);
426 if ((*cmd_ctx
)->lsm
) {
427 free((*cmd_ctx
)->lsm
);
435 * Send all stream fds of kernel channel to the consumer.
437 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
438 int sock
, struct ltt_kernel_channel
*channel
)
441 struct ltt_kernel_stream
*stream
;
442 struct lttcomm_consumer_msg lkm
;
444 DBG("Sending streams of channel %s to kernel consumer",
445 channel
->channel
->name
);
448 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
449 lkm
.u
.channel
.channel_key
= channel
->fd
;
450 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
451 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
452 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
453 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
455 perror("send consumer channel");
460 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
464 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
465 lkm
.u
.stream
.channel_key
= channel
->fd
;
466 lkm
.u
.stream
.stream_key
= stream
->fd
;
467 lkm
.u
.stream
.state
= stream
->state
;
468 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
469 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
470 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
471 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
472 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
473 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
475 perror("send consumer stream");
478 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
480 perror("send consumer stream ancillary data");
485 DBG("consumer channel streams sent");
494 * Send all stream fds of the kernel session to the consumer.
496 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
497 struct ltt_kernel_session
*session
)
500 struct ltt_kernel_channel
*chan
;
501 struct lttcomm_consumer_msg lkm
;
502 int sock
= session
->consumer_fd
;
504 DBG("Sending metadata stream fd");
506 /* Extra protection. It's NOT supposed to be set to 0 at this point */
507 if (session
->consumer_fd
== 0) {
508 session
->consumer_fd
= consumer_data
->cmd_sock
;
511 if (session
->metadata_stream_fd
!= 0) {
512 /* Send metadata channel fd */
513 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
514 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
515 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
516 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
517 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
518 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
520 perror("send consumer channel");
524 /* Send metadata stream fd */
525 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
526 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
527 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
528 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
529 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
530 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
531 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
532 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
533 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
534 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
536 perror("send consumer stream");
539 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
541 perror("send consumer stream");
546 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
547 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
553 DBG("consumer fds (metadata and channel streams) sent");
562 * Notify UST applications using the shm mmap futex.
564 static int notify_ust_apps(int active
)
568 DBG("Notifying applications of session daemon state: %d", active
);
570 /* See shm.c for this call implying mmap, shm and futex calls */
571 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
572 if (wait_shm_mmap
== NULL
) {
576 /* Wake waiting process */
577 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
579 /* Apps notified successfully */
587 * Setup the outgoing data buffer for the response (llm) by allocating the
588 * right amount of memory and copying the original information from the lsm
591 * Return total size of the buffer pointed by buf.
593 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
599 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
600 if (cmd_ctx
->llm
== NULL
) {
606 /* Copy common data */
607 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
608 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
610 cmd_ctx
->llm
->data_size
= size
;
611 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
620 * Update the kernel poll set of all channel fd available over all tracing
621 * session. Add the wakeup pipe at the end of the set.
623 static int update_kernel_poll(struct lttng_poll_event
*events
)
626 struct ltt_session
*session
;
627 struct ltt_kernel_channel
*channel
;
629 DBG("Updating kernel poll set");
632 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
633 session_lock(session
);
634 if (session
->kernel_session
== NULL
) {
635 session_unlock(session
);
639 cds_list_for_each_entry(channel
,
640 &session
->kernel_session
->channel_list
.head
, list
) {
641 /* Add channel fd to the kernel poll set */
642 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
644 session_unlock(session
);
647 DBG("Channel fd %d added to kernel set", channel
->fd
);
649 session_unlock(session
);
651 session_unlock_list();
656 session_unlock_list();
661 * Find the channel fd from 'fd' over all tracing session. When found, check
662 * for new channel stream and send those stream fds to the kernel consumer.
664 * Useful for CPU hotplug feature.
666 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
669 struct ltt_session
*session
;
670 struct ltt_kernel_channel
*channel
;
672 DBG("Updating kernel streams for channel fd %d", fd
);
675 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
676 session_lock(session
);
677 if (session
->kernel_session
== NULL
) {
678 session_unlock(session
);
682 /* This is not suppose to be 0 but this is an extra security check */
683 if (session
->kernel_session
->consumer_fd
== 0) {
684 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
687 cds_list_for_each_entry(channel
,
688 &session
->kernel_session
->channel_list
.head
, list
) {
689 if (channel
->fd
== fd
) {
690 DBG("Channel found, updating kernel streams");
691 ret
= kernel_open_channel_stream(channel
);
697 * Have we already sent fds to the consumer? If yes, it means
698 * that tracing is started so it is safe to send our updated
701 if (session
->kernel_session
->consumer_fds_sent
== 1) {
702 ret
= send_kconsumer_channel_streams(consumer_data
,
703 session
->kernel_session
->consumer_fd
, channel
);
711 session_unlock(session
);
713 session_unlock_list();
717 session_unlock(session
);
718 session_unlock_list();
723 * For each tracing session, update newly registered apps.
725 static void update_ust_app(int app_sock
)
727 struct ltt_session
*sess
, *stmp
;
729 /* For all tracing session(s) */
730 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
731 if (sess
->ust_session
) {
732 ust_app_global_update(sess
->ust_session
, app_sock
);
738 * This thread manage event coming from the kernel.
740 * Features supported in this thread:
743 static void *thread_manage_kernel(void *data
)
745 int ret
, i
, pollfd
, update_poll_flag
= 1;
746 uint32_t revents
, nb_fd
;
748 struct lttng_poll_event events
;
750 DBG("Thread manage kernel started");
752 ret
= create_thread_poll_set(&events
, 2);
757 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
763 if (update_poll_flag
== 1) {
765 * Reset number of fd in the poll set. Always 2 since there is the thread
766 * quit pipe and the kernel pipe.
770 ret
= update_kernel_poll(&events
);
774 update_poll_flag
= 0;
777 nb_fd
= LTTNG_POLL_GETNB(&events
);
779 DBG("Thread kernel polling on %d fds", nb_fd
);
781 /* Zeroed the poll events */
782 lttng_poll_reset(&events
);
784 /* Poll infinite value of time */
785 ret
= lttng_poll_wait(&events
, -1);
788 } else if (ret
== 0) {
789 /* Should not happen since timeout is infinite */
790 ERR("Return value of poll is 0 with an infinite timeout.\n"
791 "This should not have happened! Continuing...");
795 for (i
= 0; i
< nb_fd
; i
++) {
796 /* Fetch once the poll data */
797 revents
= LTTNG_POLL_GETEV(&events
, i
);
798 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
800 /* Thread quit pipe has been closed. Killing thread. */
801 ret
= check_thread_quit_pipe(pollfd
, revents
);
806 /* Check for data on kernel pipe */
807 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
808 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
809 update_poll_flag
= 1;
813 * New CPU detected by the kernel. Adding kernel stream to
814 * kernel session and updating the kernel consumer
816 if (revents
& LPOLLIN
) {
817 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
823 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
824 * and unregister kernel stream at this point.
832 DBG("Kernel thread dying");
833 close(kernel_poll_pipe
[0]);
834 close(kernel_poll_pipe
[1]);
836 lttng_poll_clean(&events
);
842 * This thread manage the consumer error sent back to the session daemon.
844 static void *thread_manage_consumer(void *data
)
846 int sock
= 0, i
, ret
, pollfd
;
847 uint32_t revents
, nb_fd
;
848 enum lttcomm_return_code code
;
849 struct lttng_poll_event events
;
850 struct consumer_data
*consumer_data
= data
;
852 DBG("[thread] Manage consumer started");
854 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
860 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
861 * Nothing more will be added to this poll set.
863 ret
= create_thread_poll_set(&events
, 2);
868 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
873 nb_fd
= LTTNG_POLL_GETNB(&events
);
875 /* Inifinite blocking call, waiting for transmission */
876 ret
= lttng_poll_wait(&events
, -1);
881 for (i
= 0; i
< nb_fd
; i
++) {
882 /* Fetch once the poll data */
883 revents
= LTTNG_POLL_GETEV(&events
, i
);
884 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
886 /* Thread quit pipe has been closed. Killing thread. */
887 ret
= check_thread_quit_pipe(pollfd
, revents
);
892 /* Event on the registration socket */
893 if (pollfd
== consumer_data
->err_sock
) {
894 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
895 ERR("consumer err socket poll error");
901 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
906 DBG2("Receiving code from consumer err_sock");
908 /* Getting status code from kconsumerd */
909 ret
= lttcomm_recv_unix_sock(sock
, &code
,
910 sizeof(enum lttcomm_return_code
));
915 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
916 consumer_data
->cmd_sock
=
917 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
918 if (consumer_data
->cmd_sock
< 0) {
919 sem_post(&consumer_data
->sem
);
920 PERROR("consumer connect");
923 /* Signal condition to tell that the kconsumerd is ready */
924 sem_post(&consumer_data
->sem
);
925 DBG("consumer command socket ready");
927 ERR("consumer error when waiting for SOCK_READY : %s",
928 lttcomm_get_readable_code(-code
));
932 /* Remove the kconsumerd error sock since we've established a connexion */
933 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
938 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
943 /* Update number of fd */
944 nb_fd
= LTTNG_POLL_GETNB(&events
);
946 /* Inifinite blocking call, waiting for transmission */
947 ret
= lttng_poll_wait(&events
, -1);
952 for (i
= 0; i
< nb_fd
; i
++) {
953 /* Fetch once the poll data */
954 revents
= LTTNG_POLL_GETEV(&events
, i
);
955 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
957 /* Thread quit pipe has been closed. Killing thread. */
958 ret
= check_thread_quit_pipe(pollfd
, revents
);
963 /* Event on the kconsumerd socket */
964 if (pollfd
== sock
) {
965 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
966 ERR("consumer err socket second poll error");
972 /* Wait for any kconsumerd error */
973 ret
= lttcomm_recv_unix_sock(sock
, &code
,
974 sizeof(enum lttcomm_return_code
));
976 ERR("consumer closed the command socket");
980 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
983 DBG("consumer thread dying");
984 close(consumer_data
->err_sock
);
985 close(consumer_data
->cmd_sock
);
988 unlink(consumer_data
->err_unix_sock_path
);
989 unlink(consumer_data
->cmd_unix_sock_path
);
990 consumer_data
->pid
= 0;
992 lttng_poll_clean(&events
);
998 * This thread manage application communication.
1000 static void *thread_manage_apps(void *data
)
1003 uint32_t revents
, nb_fd
;
1004 struct ust_command ust_cmd
;
1005 struct lttng_poll_event events
;
1007 DBG("[thread] Manage application started");
1009 rcu_register_thread();
1010 rcu_thread_online();
1012 ret
= create_thread_poll_set(&events
, 2);
1017 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1023 /* Zeroed the events structure */
1024 lttng_poll_reset(&events
);
1026 nb_fd
= LTTNG_POLL_GETNB(&events
);
1028 DBG("Apps thread polling on %d fds", nb_fd
);
1030 /* Inifinite blocking call, waiting for transmission */
1031 ret
= lttng_poll_wait(&events
, -1);
1036 for (i
= 0; i
< nb_fd
; i
++) {
1037 /* Fetch once the poll data */
1038 revents
= LTTNG_POLL_GETEV(&events
, i
);
1039 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1041 /* Thread quit pipe has been closed. Killing thread. */
1042 ret
= check_thread_quit_pipe(pollfd
, revents
);
1047 /* Inspect the apps cmd pipe */
1048 if (pollfd
== apps_cmd_pipe
[0]) {
1049 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1050 ERR("Apps command pipe error");
1052 } else if (revents
& LPOLLIN
) {
1054 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1055 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1056 perror("read apps cmd pipe");
1060 /* Register applicaton to the session daemon */
1061 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1064 /* Only critical ENOMEM error can be returned here */
1069 * Add channel(s) and event(s) to newly registered apps
1070 * from lttng global UST domain.
1072 update_ust_app(ust_cmd
.sock
);
1074 ret
= ustctl_register_done(ust_cmd
.sock
);
1077 * If the registration is not possible, we simply
1078 * unregister the apps and continue
1080 ust_app_unregister(ust_cmd
.sock
);
1083 * We just need here to monitor the close of the UST
1084 * socket and poll set monitor those by default.
1086 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1091 DBG("Apps with sock %d added to poll set",
1099 * At this point, we know that a registered application made
1100 * the event at poll_wait.
1102 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1103 /* Removing from the poll set */
1104 ret
= lttng_poll_del(&events
, pollfd
);
1109 /* Socket closed on remote end. */
1110 ust_app_unregister(pollfd
);
1118 DBG("Application communication apps dying");
1119 close(apps_cmd_pipe
[0]);
1120 close(apps_cmd_pipe
[1]);
1122 lttng_poll_clean(&events
);
1124 rcu_thread_offline();
1125 rcu_unregister_thread();
1130 * Dispatch request from the registration threads to the application
1131 * communication thread.
1133 static void *thread_dispatch_ust_registration(void *data
)
1136 struct cds_wfq_node
*node
;
1137 struct ust_command
*ust_cmd
= NULL
;
1139 DBG("[thread] Dispatch UST command started");
1141 while (!dispatch_thread_exit
) {
1142 /* Atomically prepare the queue futex */
1143 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1146 /* Dequeue command for registration */
1147 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1149 DBG("Woken up but nothing in the UST command queue");
1150 /* Continue thread execution */
1154 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1156 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1157 " gid:%d sock:%d name:%s (version %d.%d)",
1158 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1159 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1160 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1161 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1163 * Inform apps thread of the new application registration. This
1164 * call is blocking so we can be assured that the data will be read
1165 * at some point in time or wait to the end of the world :)
1167 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1168 sizeof(struct ust_command
));
1170 perror("write apps cmd pipe");
1171 if (errno
== EBADF
) {
1173 * We can't inform the application thread to process
1174 * registration. We will exit or else application
1175 * registration will not occur and tracing will never
1182 } while (node
!= NULL
);
1184 /* Futex wait on queue. Blocking call on futex() */
1185 futex_nto1_wait(&ust_cmd_queue
.futex
);
1189 DBG("Dispatch thread dying");
1194 * This thread manage application registration.
1196 static void *thread_registration_apps(void *data
)
1198 int sock
= 0, i
, ret
, pollfd
;
1199 uint32_t revents
, nb_fd
;
1200 struct lttng_poll_event events
;
1202 * Get allocated in this thread, enqueued to a global queue, dequeued and
1203 * freed in the manage apps thread.
1205 struct ust_command
*ust_cmd
= NULL
;
1207 DBG("[thread] Manage application registration started");
1209 ret
= lttcomm_listen_unix_sock(apps_sock
);
1215 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1216 * more will be added to this poll set.
1218 ret
= create_thread_poll_set(&events
, 2);
1223 /* Add the application registration socket */
1224 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1229 /* Notify all applications to register */
1230 ret
= notify_ust_apps(1);
1232 ERR("Failed to notify applications or create the wait shared memory.\n"
1233 "Execution continues but there might be problem for already\n"
1234 "running applications that wishes to register.");
1238 DBG("Accepting application registration");
1240 nb_fd
= LTTNG_POLL_GETNB(&events
);
1242 /* Inifinite blocking call, waiting for transmission */
1243 ret
= lttng_poll_wait(&events
, -1);
1248 for (i
= 0; i
< nb_fd
; i
++) {
1249 /* Fetch once the poll data */
1250 revents
= LTTNG_POLL_GETEV(&events
, i
);
1251 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1253 /* Thread quit pipe has been closed. Killing thread. */
1254 ret
= check_thread_quit_pipe(pollfd
, revents
);
1259 /* Event on the registration socket */
1260 if (pollfd
== apps_sock
) {
1261 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1262 ERR("Register apps socket poll error");
1264 } else if (revents
& LPOLLIN
) {
1265 sock
= lttcomm_accept_unix_sock(apps_sock
);
1270 /* Create UST registration command for enqueuing */
1271 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1272 if (ust_cmd
== NULL
) {
1273 perror("ust command zmalloc");
1278 * Using message-based transmissions to ensure we don't
1279 * have to deal with partially received messages.
1281 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1282 sizeof(struct ust_register_msg
));
1283 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1285 perror("lttcomm_recv_unix_sock register apps");
1287 ERR("Wrong size received on apps register");
1294 ust_cmd
->sock
= sock
;
1296 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1297 " gid:%d sock:%d name:%s (version %d.%d)",
1298 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1299 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1300 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1301 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1304 * Lock free enqueue the registration request. The red pill
1305 * has been taken! This apps will be part of the *system*.
1307 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1310 * Wake the registration queue futex. Implicit memory
1311 * barrier with the exchange in cds_wfq_enqueue.
1313 futex_nto1_wake(&ust_cmd_queue
.futex
);
1320 DBG("UST Registration thread dying");
1322 /* Notify that the registration thread is gone */
1327 unlink(apps_unix_sock_path
);
1329 lttng_poll_clean(&events
);
1335 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1336 * exec or it will fails.
1338 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1341 struct timespec timeout
;
1343 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1344 timeout
.tv_nsec
= 0;
1346 /* Setup semaphore */
1347 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1349 PERROR("sem_init consumer semaphore");
1353 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1354 thread_manage_consumer
, consumer_data
);
1356 PERROR("pthread_create consumer");
1361 /* Get time for sem_timedwait absolute timeout */
1362 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1364 PERROR("clock_gettime spawn consumer");
1365 /* Infinite wait for the kconsumerd thread to be ready */
1366 ret
= sem_wait(&consumer_data
->sem
);
1368 /* Normal timeout if the gettime was successful */
1369 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1370 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1374 if (errno
== ETIMEDOUT
) {
1376 * Call has timed out so we kill the kconsumerd_thread and return
1379 ERR("The consumer thread was never ready. Killing it");
1380 ret
= pthread_cancel(consumer_data
->thread
);
1382 PERROR("pthread_cancel consumer thread");
1385 PERROR("semaphore wait failed consumer thread");
1390 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1391 if (consumer_data
->pid
== 0) {
1392 ERR("Kconsumerd did not start");
1393 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1396 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1405 * Join consumer thread
1407 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1412 if (consumer_data
->pid
!= 0) {
1413 ret
= kill(consumer_data
->pid
, SIGTERM
);
1415 ERR("Error killing consumer daemon");
1418 return pthread_join(consumer_data
->thread
, &status
);
1425 * Fork and exec a consumer daemon (consumerd).
1427 * Return pid if successful else -1.
1429 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1433 const char *verbosity
;
1435 DBG("Spawning consumerd");
1442 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1443 verbosity
= "--verbose";
1445 verbosity
= "--quiet";
1447 switch (consumer_data
->type
) {
1448 case LTTNG_CONSUMER_KERNEL
:
1449 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1450 "lttng-consumerd", verbosity
, "-k", NULL
);
1452 case LTTNG_CONSUMER_UST
:
1453 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1454 "lttng-consumerd", verbosity
, "-u", NULL
);
1457 perror("unknown consumer type");
1461 perror("kernel start consumer exec");
1464 } else if (pid
> 0) {
1467 perror("start consumer fork");
1474 * Spawn the consumerd daemon and session daemon thread.
1476 static int start_consumerd(struct consumer_data
*consumer_data
)
1480 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1481 if (consumer_data
->pid
!= 0) {
1482 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1486 ret
= spawn_consumerd(consumer_data
);
1488 ERR("Spawning consumerd failed");
1489 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1493 /* Setting up the consumer_data pid */
1494 consumer_data
->pid
= ret
;
1495 DBG2("Consumer pid %d", consumer_data
->pid
);
1496 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1498 DBG2("Spawning consumer control thread");
1499 ret
= spawn_consumer_thread(consumer_data
);
1501 ERR("Fatal error spawning consumer control thread");
1513 * modprobe_kernel_modules
1515 static int modprobe_kernel_modules(void)
1520 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1521 ret
= snprintf(modprobe
, sizeof(modprobe
),
1522 "/sbin/modprobe %s%s",
1523 kernel_modules_list
[i
].required
? "" : "-q ",
1524 kernel_modules_list
[i
].name
);
1526 perror("snprintf modprobe");
1529 modprobe
[sizeof(modprobe
) - 1] = '\0';
1530 ret
= system(modprobe
);
1532 ERR("Unable to launch modprobe for module %s",
1533 kernel_modules_list
[i
].name
);
1534 } else if (kernel_modules_list
[i
].required
1535 && WEXITSTATUS(ret
) != 0) {
1536 ERR("Unable to load module %s",
1537 kernel_modules_list
[i
].name
);
1539 DBG("Modprobe successfully %s",
1540 kernel_modules_list
[i
].name
);
1551 static int mount_debugfs(char *path
)
1554 char *type
= "debugfs";
1556 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1558 PERROR("Cannot create debugfs path");
1562 ret
= mount(type
, path
, type
, 0, NULL
);
1564 PERROR("Cannot mount debugfs");
1568 DBG("Mounted debugfs successfully at %s", path
);
1575 * Setup necessary data for kernel tracer action.
1577 static void init_kernel_tracer(void)
1580 char *proc_mounts
= "/proc/mounts";
1582 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1585 /* Detect debugfs */
1586 fp
= fopen(proc_mounts
, "r");
1588 ERR("Unable to probe %s", proc_mounts
);
1592 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1593 if (strstr(line
, "debugfs") != NULL
) {
1594 /* Remove first string */
1596 /* Dup string here so we can reuse line later on */
1597 debugfs_path
= strdup(strtok(NULL
, " "));
1598 DBG("Got debugfs path : %s", debugfs_path
);
1605 /* Mount debugfs if needded */
1606 if (debugfs_path
== NULL
) {
1607 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1609 perror("asprintf debugfs path");
1612 ret
= mount_debugfs(debugfs_path
);
1614 perror("Cannot mount debugfs");
1619 /* Modprobe lttng kernel modules */
1620 ret
= modprobe_kernel_modules();
1625 /* Setup lttng kernel path */
1626 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1628 perror("asprintf lttng path");
1632 /* Open debugfs lttng */
1633 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1634 if (kernel_tracer_fd
< 0) {
1635 DBG("Failed to open %s", lttng_path
);
1641 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1651 WARN("No kernel tracer available");
1652 kernel_tracer_fd
= 0;
1657 * Init tracing by creating trace directory and sending fds kernel consumer.
1659 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1663 if (session
->consumer_fds_sent
== 0) {
1665 * Assign default kernel consumer socket if no consumer assigned to the
1666 * kernel session. At this point, it's NOT suppose to be 0 but this is
1667 * an extra security check.
1669 if (session
->consumer_fd
== 0) {
1670 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1673 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1675 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1679 session
->consumer_fds_sent
= 1;
1687 * Create an UST session and add it to the session ust list.
1689 static int create_ust_session(struct ltt_session
*session
,
1690 struct lttng_domain
*domain
)
1694 struct ltt_ust_session
*lus
= NULL
;
1696 switch (domain
->type
) {
1697 case LTTNG_DOMAIN_UST
:
1700 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1704 DBG("Creating UST session");
1706 session_lock_list();
1707 uid
= session_list_ptr
->count
;
1708 session_unlock_list();
1710 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1712 ret
= LTTCOMM_UST_SESS_FAIL
;
1716 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1717 geteuid(), allowed_group());
1719 if (ret
!= -EEXIST
) {
1720 ERR("Trace directory creation error");
1721 ret
= LTTCOMM_UST_SESS_FAIL
;
1726 /* The domain type dictate different actions on session creation */
1727 switch (domain
->type
) {
1728 case LTTNG_DOMAIN_UST
:
1729 /* No ustctl for the global UST domain */
1732 ERR("Unknown UST domain on create session %d", domain
->type
);
1735 session
->ust_session
= lus
;
1745 * Create a kernel tracer session then create the default channel.
1747 static int create_kernel_session(struct ltt_session
*session
)
1751 DBG("Creating kernel session");
1753 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1755 ret
= LTTCOMM_KERN_SESS_FAIL
;
1759 /* Set kernel consumer socket fd */
1760 if (kconsumer_data
.cmd_sock
) {
1761 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1764 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1765 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1767 if (ret
!= -EEXIST
) {
1768 ERR("Trace directory creation error");
1778 * Using the session list, filled a lttng_session array to send back to the
1779 * client for session listing.
1781 * The session list lock MUST be acquired before calling this function. Use
1782 * session_lock_list() and session_unlock_list().
1784 static void list_lttng_sessions(struct lttng_session
*sessions
)
1787 struct ltt_session
*session
;
1789 DBG("Getting all available session");
1791 * Iterate over session list and append data after the control struct in
1794 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1795 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1796 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1797 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1798 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1799 sessions
[i
].enabled
= session
->enabled
;
1805 * Fill lttng_channel array of all channels.
1807 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1808 struct lttng_channel
*channels
)
1811 struct ltt_kernel_channel
*kchan
;
1813 DBG("Listing channels for session %s", session
->name
);
1816 case LTTNG_DOMAIN_KERNEL
:
1817 /* Kernel channels */
1818 if (session
->kernel_session
!= NULL
) {
1819 cds_list_for_each_entry(kchan
,
1820 &session
->kernel_session
->channel_list
.head
, list
) {
1821 /* Copy lttng_channel struct to array */
1822 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1823 channels
[i
].enabled
= kchan
->enabled
;
1828 case LTTNG_DOMAIN_UST
:
1830 struct cds_lfht_iter iter
;
1831 struct ltt_ust_channel
*uchan
;
1833 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1834 &iter
, uchan
, node
) {
1835 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1836 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1837 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1838 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1839 channels
[i
].attr
.switch_timer_interval
=
1840 uchan
->attr
.switch_timer_interval
;
1841 channels
[i
].attr
.read_timer_interval
=
1842 uchan
->attr
.read_timer_interval
;
1843 channels
[i
].attr
.output
= uchan
->attr
.output
;
1853 * Create a list of ust global domain events.
1855 static int list_lttng_ust_global_events(char *channel_name
,
1856 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1859 unsigned int nb_event
= 0;
1860 struct cds_lfht_iter iter
;
1861 struct ltt_ust_channel
*uchan
;
1862 struct ltt_ust_event
*uevent
;
1863 struct lttng_event
*tmp
;
1865 DBG("Listing UST global events for channel %s", channel_name
);
1869 /* Count events in all channels */
1870 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1871 nb_event
+= hashtable_get_count(uchan
->events
);
1874 if (nb_event
== 0) {
1879 DBG3("Listing UST global %d events", nb_event
);
1881 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1883 ret
= -LTTCOMM_FATAL
;
1887 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1888 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
1889 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
1890 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1891 tmp
[i
].enabled
= uevent
->enabled
;
1892 switch (uevent
->attr
.instrumentation
) {
1893 case LTTNG_UST_TRACEPOINT
:
1894 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1896 case LTTNG_UST_PROBE
:
1897 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
1899 case LTTNG_UST_FUNCTION
:
1900 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
1916 * Fill lttng_event array of all kernel events in the channel.
1918 static int list_lttng_kernel_events(char *channel_name
,
1919 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
1922 unsigned int nb_event
;
1923 struct ltt_kernel_event
*event
;
1924 struct ltt_kernel_channel
*kchan
;
1926 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
1927 if (kchan
== NULL
) {
1928 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1932 nb_event
= kchan
->event_count
;
1934 DBG("Listing events for channel %s", kchan
->channel
->name
);
1936 if (nb_event
== 0) {
1941 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1942 if (*events
== NULL
) {
1943 ret
= LTTCOMM_FATAL
;
1947 /* Kernel channels */
1948 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1949 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1950 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1951 (*events
)[i
].enabled
= event
->enabled
;
1952 switch (event
->event
->instrumentation
) {
1953 case LTTNG_KERNEL_TRACEPOINT
:
1954 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1956 case LTTNG_KERNEL_KPROBE
:
1957 case LTTNG_KERNEL_KRETPROBE
:
1958 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
1959 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1960 sizeof(struct lttng_kernel_kprobe
));
1962 case LTTNG_KERNEL_FUNCTION
:
1963 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
1964 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
1965 sizeof(struct lttng_kernel_function
));
1967 case LTTNG_KERNEL_NOOP
:
1968 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
1970 case LTTNG_KERNEL_SYSCALL
:
1971 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
1973 case LTTNG_KERNEL_ALL
:
1987 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1989 static int cmd_disable_channel(struct ltt_session
*session
,
1990 int domain
, char *channel_name
)
1995 case LTTNG_DOMAIN_KERNEL
:
1996 ret
= channel_kernel_disable(session
->kernel_session
,
1998 if (ret
!= LTTCOMM_OK
) {
2002 kernel_wait_quiescent(kernel_tracer_fd
);
2004 case LTTNG_DOMAIN_UST_PID
:
2007 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2018 * Copy channel from attributes and set it in the application channel list.
2021 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2022 struct lttng_channel *attr, struct ust_app *app)
2025 struct ltt_ust_channel *uchan, *new_chan;
2027 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2028 if (uchan == NULL) {
2029 ret = LTTCOMM_FATAL;
2033 new_chan = trace_ust_create_channel(attr, usess->path);
2034 if (new_chan == NULL) {
2035 PERROR("malloc ltt_ust_channel");
2036 ret = LTTCOMM_FATAL;
2040 ret = channel_ust_copy(new_chan, uchan);
2042 ret = LTTCOMM_FATAL;
2052 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2054 static int cmd_enable_channel(struct ltt_session
*session
,
2055 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
2058 struct ltt_ust_session
*usess
= session
->ust_session
;
2060 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2062 switch (domain
->type
) {
2063 case LTTNG_DOMAIN_KERNEL
:
2065 struct ltt_kernel_channel
*kchan
;
2067 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2068 session
->kernel_session
);
2069 if (kchan
== NULL
) {
2070 ret
= channel_kernel_create(session
->kernel_session
,
2071 attr
, kernel_poll_pipe
[1]);
2073 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2076 if (ret
!= LTTCOMM_OK
) {
2080 kernel_wait_quiescent(kernel_tracer_fd
);
2083 case LTTNG_DOMAIN_UST
:
2085 struct ltt_ust_channel
*uchan
;
2087 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2089 /* Get channel in global UST domain HT */
2090 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2092 if (uchan
== NULL
) {
2093 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2094 if (uchan
== NULL
) {
2095 ret
= LTTCOMM_UST_CHAN_FAIL
;
2100 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2102 DBG2("UST channel %s added to global domain HT", attr
->name
);
2104 ret
= LTTCOMM_UST_CHAN_EXIST
;
2108 /* Add channel to all registered applications */
2109 ret
= ust_app_create_channel_all(usess
, uchan
);
2118 case LTTNG_DOMAIN_UST_PID
:
2122 struct ltt_ust_channel *uchan;
2123 struct ltt_ust_session *usess;
2124 struct ust_app *app;
2126 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2128 if (usess == NULL) {
2129 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2133 app = ust_app_get_by_pid(domain->attr.pid);
2135 ret = LTTCOMM_APP_NOT_FOUND;
2140 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2141 if (uchan == NULL) {
2142 ret = channel_ust_create(usess, attr, sock);
2144 ret = channel_ust_enable(usess, uchan, sock);
2147 if (ret != LTTCOMM_OK) {
2151 ret = copy_ust_channel_to_app(usess, attr, app);
2152 if (ret != LTTCOMM_OK) {
2156 DBG("UST channel %s created for app sock %d with pid %d",
2157 attr->name, app->sock, domain->attr.pid);
2159 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2163 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2174 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2176 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2177 char *channel_name
, char *event_name
)
2182 case LTTNG_DOMAIN_KERNEL
:
2184 struct ltt_kernel_channel
*kchan
;
2186 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2187 session
->kernel_session
);
2188 if (kchan
== NULL
) {
2189 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2193 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2194 if (ret
!= LTTCOMM_OK
) {
2198 kernel_wait_quiescent(kernel_tracer_fd
);
2201 case LTTNG_DOMAIN_UST
:
2202 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2203 case LTTNG_DOMAIN_UST_PID
:
2204 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2206 /* TODO: Other UST domains */
2207 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2218 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2220 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2224 struct ltt_kernel_channel
*kchan
;
2227 case LTTNG_DOMAIN_KERNEL
:
2228 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2229 session
->kernel_session
);
2230 if (kchan
== NULL
) {
2231 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2235 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2236 if (ret
!= LTTCOMM_OK
) {
2240 kernel_wait_quiescent(kernel_tracer_fd
);
2243 /* TODO: Userspace tracing */
2244 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2255 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2257 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2258 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2263 case LTTNG_DOMAIN_KERNEL
:
2264 /* Add kernel context to kernel tracer */
2265 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2266 event_name
, channel_name
);
2267 if (ret
!= LTTCOMM_OK
) {
2271 case LTTNG_DOMAIN_UST
:
2274 struct ltt_ust_session *usess;
2276 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2277 ret = context_ust_add(usess, ctx,
2278 event_name, channel_name, domain);
2279 if (ret != LTTCOMM_OK) {
2287 /* TODO: UST other domains */
2288 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2299 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2301 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2302 char *channel_name
, struct lttng_event
*event
)
2305 struct lttng_channel
*attr
;
2306 struct ltt_ust_session
*usess
= session
->ust_session
;
2309 case LTTNG_DOMAIN_KERNEL
:
2311 struct ltt_kernel_channel
*kchan
;
2313 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2314 session
->kernel_session
);
2315 if (kchan
== NULL
) {
2316 attr
= channel_new_default_attr(domain
);
2318 ret
= LTTCOMM_FATAL
;
2321 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2323 /* This call will notify the kernel thread */
2324 ret
= channel_kernel_create(session
->kernel_session
,
2325 attr
, kernel_poll_pipe
[1]);
2326 if (ret
!= LTTCOMM_OK
) {
2331 /* Get the newly created kernel channel pointer */
2332 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2333 session
->kernel_session
);
2334 if (kchan
== NULL
) {
2335 /* This sould not happen... */
2336 ret
= LTTCOMM_FATAL
;
2340 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2342 if (ret
!= LTTCOMM_OK
) {
2346 kernel_wait_quiescent(kernel_tracer_fd
);
2349 case LTTNG_DOMAIN_UST
:
2351 struct ltt_ust_channel
*uchan
;
2352 struct ltt_ust_event
*uevent
;
2354 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2356 if (uchan
== NULL
) {
2357 /* TODO: Create default channel */
2358 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2362 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2363 if (uevent
== NULL
) {
2364 uevent
= trace_ust_create_event(event
);
2365 if (uevent
== NULL
) {
2366 ret
= LTTCOMM_FATAL
;
2372 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2374 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2378 /* Add ltt ust event to channel */
2380 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2383 uevent
->enabled
= 1;
2385 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
2389 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2390 case LTTNG_DOMAIN_UST_PID
:
2391 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2393 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2404 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2406 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2407 char *channel_name
, int event_type
)
2410 struct ltt_kernel_channel
*kchan
;
2413 case LTTNG_DOMAIN_KERNEL
:
2414 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2415 session
->kernel_session
);
2416 if (kchan
== NULL
) {
2417 /* This call will notify the kernel thread */
2418 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2419 kernel_poll_pipe
[1]);
2420 if (ret
!= LTTCOMM_OK
) {
2425 /* Get the newly created kernel channel pointer */
2426 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2427 session
->kernel_session
);
2428 if (kchan
== NULL
) {
2429 /* This sould not happen... */
2430 ret
= LTTCOMM_FATAL
;
2434 switch (event_type
) {
2435 case LTTNG_KERNEL_SYSCALL
:
2436 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2437 kchan
, kernel_tracer_fd
);
2439 case LTTNG_KERNEL_TRACEPOINT
:
2441 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2442 * events already registered to the channel.
2444 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2445 kchan
, kernel_tracer_fd
);
2447 case LTTNG_KERNEL_ALL
:
2448 /* Enable syscalls and tracepoints */
2449 ret
= event_kernel_enable_all(session
->kernel_session
,
2450 kchan
, kernel_tracer_fd
);
2453 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2456 if (ret
!= LTTCOMM_OK
) {
2460 kernel_wait_quiescent(kernel_tracer_fd
);
2463 /* TODO: Userspace tracing */
2464 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2475 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2477 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2480 ssize_t nb_events
= 0;
2483 case LTTNG_DOMAIN_KERNEL
:
2484 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2485 if (nb_events
< 0) {
2486 ret
= LTTCOMM_KERN_LIST_FAIL
;
2490 case LTTNG_DOMAIN_UST
:
2491 nb_events
= ust_app_list_events(events
);
2492 if (nb_events
< 0) {
2493 ret
= LTTCOMM_UST_LIST_FAIL
;
2498 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2505 /* Return negative value to differentiate return code */
2510 * Command LTTNG_START_TRACE processed by the client thread.
2512 static int cmd_start_trace(struct ltt_session
*session
)
2515 struct ltt_kernel_session
*ksession
;
2516 struct ltt_ust_session
*usess
;
2519 ksession
= session
->kernel_session
;
2520 usess
= session
->ust_session
;
2522 if (session
->enabled
)
2523 return LTTCOMM_UST_START_FAIL
;
2524 session
->enabled
= 1;
2526 /* Kernel tracing */
2527 if (ksession
!= NULL
) {
2528 struct ltt_kernel_channel
*kchan
;
2530 /* Open kernel metadata */
2531 if (ksession
->metadata
== NULL
) {
2532 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2534 ret
= LTTCOMM_KERN_META_FAIL
;
2539 /* Open kernel metadata stream */
2540 if (ksession
->metadata_stream_fd
== 0) {
2541 ret
= kernel_open_metadata_stream(ksession
);
2543 ERR("Kernel create metadata stream failed");
2544 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2549 /* For each channel */
2550 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2551 if (kchan
->stream_count
== 0) {
2552 ret
= kernel_open_channel_stream(kchan
);
2554 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2557 /* Update the stream global counter */
2558 ksession
->stream_count_global
+= ret
;
2562 /* Setup kernel consumer socket and send fds to it */
2563 ret
= init_kernel_tracing(ksession
);
2565 ret
= LTTCOMM_KERN_START_FAIL
;
2569 /* This start the kernel tracing */
2570 ret
= kernel_start_session(ksession
);
2572 ret
= LTTCOMM_KERN_START_FAIL
;
2576 /* Quiescent wait after starting trace */
2577 kernel_wait_quiescent(kernel_tracer_fd
);
2580 /* Flag session that trace should start automatically */
2582 usess
->start_trace
= 1;
2584 ret
= ust_app_start_trace_all(usess
);
2586 ret
= LTTCOMM_UST_START_FAIL
;
2598 * Command LTTNG_STOP_TRACE processed by the client thread.
2600 static int cmd_stop_trace(struct ltt_session
*session
)
2603 struct ltt_kernel_channel
*kchan
;
2604 struct ltt_kernel_session
*ksession
;
2605 struct ltt_ust_session
*usess
;
2608 ksession
= session
->kernel_session
;
2609 usess
= session
->ust_session
;
2611 if (!session
->enabled
)
2612 return LTTCOMM_UST_START_FAIL
;
2613 session
->enabled
= 0;
2616 if (ksession
!= NULL
) {
2617 DBG("Stop kernel tracing");
2619 /* Flush all buffers before stopping */
2620 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2622 ERR("Kernel metadata flush failed");
2625 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2626 ret
= kernel_flush_buffer(kchan
);
2628 ERR("Kernel flush buffer error");
2632 ret
= kernel_stop_session(ksession
);
2634 ret
= LTTCOMM_KERN_STOP_FAIL
;
2638 kernel_wait_quiescent(kernel_tracer_fd
);
2641 /* Flag session that trace should start automatically */
2643 usess
->start_trace
= 0;
2645 ret
= ust_app_stop_trace_all(usess
);
2647 ret
= LTTCOMM_UST_START_FAIL
;
2659 * Command LTTNG_CREATE_SESSION processed by the client thread.
2661 static int cmd_create_session(char *name
, char *path
)
2665 ret
= session_create(name
, path
);
2666 if (ret
!= LTTCOMM_OK
) {
2677 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2679 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2683 /* Clean kernel session teardown */
2684 teardown_kernel_session(session
);
2685 /* UST session teardown */
2686 teardown_ust_session(session
);
2689 * Must notify the kernel thread here to update it's poll setin order
2690 * to remove the channel(s)' fd just destroyed.
2692 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2694 perror("write kernel poll pipe");
2697 ret
= session_destroy(session
);
2703 * Command LTTNG_CALIBRATE processed by the client thread.
2705 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2710 case LTTNG_DOMAIN_KERNEL
:
2712 struct lttng_kernel_calibrate kcalibrate
;
2714 kcalibrate
.type
= calibrate
->type
;
2715 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2717 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2723 /* TODO: Userspace tracing */
2724 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2735 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2737 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2743 case LTTNG_DOMAIN_KERNEL
:
2744 /* Can't register a consumer if there is already one */
2745 if (session
->kernel_session
->consumer_fd
!= 0) {
2746 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2750 sock
= lttcomm_connect_unix_sock(sock_path
);
2752 ret
= LTTCOMM_CONNECT_FAIL
;
2756 session
->kernel_session
->consumer_fd
= sock
;
2759 /* TODO: Userspace tracing */
2760 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2771 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2773 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2774 struct lttng_domain
**domains
)
2779 if (session
->kernel_session
!= NULL
) {
2780 DBG3("Listing domains found kernel domain");
2784 if (session
->ust_session
!= NULL
) {
2785 DBG3("Listing domains found UST global domain");
2789 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2790 if (*domains
== NULL
) {
2791 ret
= -LTTCOMM_FATAL
;
2795 if (session
->kernel_session
!= NULL
) {
2796 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2800 if (session
->ust_session
!= NULL
) {
2801 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2812 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2814 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2815 struct lttng_channel
**channels
)
2818 ssize_t nb_chan
= 0;
2821 case LTTNG_DOMAIN_KERNEL
:
2822 if (session
->kernel_session
!= NULL
) {
2823 nb_chan
= session
->kernel_session
->channel_count
;
2825 DBG3("Number of kernel channels %ld", nb_chan
);
2827 case LTTNG_DOMAIN_UST
:
2828 if (session
->ust_session
!= NULL
) {
2829 nb_chan
= hashtable_get_count(
2830 session
->ust_session
->domain_global
.channels
);
2832 DBG3("Number of UST global channels %ld", nb_chan
);
2836 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2841 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2842 if (*channels
== NULL
) {
2843 ret
= -LTTCOMM_FATAL
;
2847 list_lttng_channels(domain
, session
, *channels
);
2859 * Command LTTNG_LIST_EVENTS processed by the client thread.
2861 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2862 char *channel_name
, struct lttng_event
**events
)
2865 ssize_t nb_event
= 0;
2868 case LTTNG_DOMAIN_KERNEL
:
2869 if (session
->kernel_session
!= NULL
) {
2870 nb_event
= list_lttng_kernel_events(channel_name
,
2871 session
->kernel_session
, events
);
2874 case LTTNG_DOMAIN_UST
:
2876 if (session
->ust_session
!= NULL
) {
2877 nb_event
= list_lttng_ust_global_events(channel_name
,
2878 &session
->ust_session
->domain_global
, events
);
2883 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2894 * Process the command requested by the lttng client within the command
2895 * context structure. This function make sure that the return structure (llm)
2896 * is set and ready for transmission before returning.
2898 * Return any error encountered or 0 for success.
2900 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2902 int ret
= LTTCOMM_OK
;
2903 int need_tracing_session
= 1;
2905 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2908 * Check for command that don't needs to allocate a returned payload. We do
2909 * this here so we don't have to make the call for no payload at each
2912 switch(cmd_ctx
->lsm
->cmd_type
) {
2913 case LTTNG_LIST_SESSIONS
:
2914 case LTTNG_LIST_TRACEPOINTS
:
2915 case LTTNG_LIST_DOMAINS
:
2916 case LTTNG_LIST_CHANNELS
:
2917 case LTTNG_LIST_EVENTS
:
2920 /* Setup lttng message with no payload */
2921 ret
= setup_lttng_msg(cmd_ctx
, 0);
2923 /* This label does not try to unlock the session */
2924 goto init_setup_error
;
2928 /* Commands that DO NOT need a session. */
2929 switch (cmd_ctx
->lsm
->cmd_type
) {
2930 case LTTNG_CALIBRATE
:
2931 case LTTNG_CREATE_SESSION
:
2932 case LTTNG_LIST_SESSIONS
:
2933 case LTTNG_LIST_TRACEPOINTS
:
2934 need_tracing_session
= 0;
2937 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2938 session_lock_list();
2939 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2940 session_unlock_list();
2941 if (cmd_ctx
->session
== NULL
) {
2942 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2943 ret
= LTTCOMM_SESS_NOT_FOUND
;
2945 /* If no session name specified */
2946 ret
= LTTCOMM_SELECT_SESS
;
2950 /* Acquire lock for the session */
2951 session_lock(cmd_ctx
->session
);
2957 * Check domain type for specific "pre-action".
2959 switch (cmd_ctx
->lsm
->domain
.type
) {
2960 case LTTNG_DOMAIN_KERNEL
:
2961 /* Kernel tracer check */
2962 if (kernel_tracer_fd
== 0) {
2963 /* Basically, load kernel tracer modules */
2964 init_kernel_tracer();
2965 if (kernel_tracer_fd
== 0) {
2966 ret
= LTTCOMM_KERN_NA
;
2971 /* Need a session for kernel command */
2972 if (need_tracing_session
) {
2973 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2974 ret
= create_kernel_session(cmd_ctx
->session
);
2976 ret
= LTTCOMM_KERN_SESS_FAIL
;
2981 /* Start the kernel consumer daemon */
2982 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2983 if (kconsumer_data
.pid
== 0 &&
2984 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2985 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2986 ret
= start_consumerd(&kconsumer_data
);
2988 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2992 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2995 case LTTNG_DOMAIN_UST
:
2997 if (need_tracing_session
) {
2998 if (cmd_ctx
->session
->ust_session
== NULL
) {
2999 ret
= create_ust_session(cmd_ctx
->session
,
3000 &cmd_ctx
->lsm
->domain
);
3001 if (ret
!= LTTCOMM_OK
) {
3005 /* Start the kernel consumer daemon */
3006 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
3007 if (ustconsumer_data
.pid
== 0 &&
3008 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3009 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3010 ret
= start_consumerd(&ustconsumer_data
);
3012 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3016 ust_consumer_fd
= ustconsumer_data
.cmd_sock
;
3018 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3026 /* Process by command type */
3027 switch (cmd_ctx
->lsm
->cmd_type
) {
3028 case LTTNG_ADD_CONTEXT
:
3030 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3031 cmd_ctx
->lsm
->u
.context
.channel_name
,
3032 cmd_ctx
->lsm
->u
.context
.event_name
,
3033 &cmd_ctx
->lsm
->u
.context
.ctx
);
3036 case LTTNG_DISABLE_CHANNEL
:
3038 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3039 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3042 case LTTNG_DISABLE_EVENT
:
3044 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3045 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3046 cmd_ctx
->lsm
->u
.disable
.name
);
3050 case LTTNG_DISABLE_ALL_EVENT
:
3052 DBG("Disabling all events");
3054 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3055 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3058 case LTTNG_ENABLE_CHANNEL
:
3060 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3061 &cmd_ctx
->lsm
->u
.channel
.chan
);
3064 case LTTNG_ENABLE_EVENT
:
3066 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3067 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3068 &cmd_ctx
->lsm
->u
.enable
.event
);
3071 case LTTNG_ENABLE_ALL_EVENT
:
3073 DBG("Enabling all events");
3075 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3076 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3077 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3080 case LTTNG_LIST_TRACEPOINTS
:
3082 struct lttng_event
*events
;
3085 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3086 if (nb_events
< 0) {
3092 * Setup lttng message with payload size set to the event list size in
3093 * bytes and then copy list into the llm payload.
3095 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3101 /* Copy event list into message payload */
3102 memcpy(cmd_ctx
->llm
->payload
, events
,
3103 sizeof(struct lttng_event
) * nb_events
);
3110 case LTTNG_START_TRACE
:
3112 ret
= cmd_start_trace(cmd_ctx
->session
);
3115 case LTTNG_STOP_TRACE
:
3117 ret
= cmd_stop_trace(cmd_ctx
->session
);
3120 case LTTNG_CREATE_SESSION
:
3122 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3123 cmd_ctx
->lsm
->session
.path
);
3126 case LTTNG_DESTROY_SESSION
:
3128 ret
= cmd_destroy_session(cmd_ctx
->session
,
3129 cmd_ctx
->lsm
->session
.name
);
3132 case LTTNG_LIST_DOMAINS
:
3135 struct lttng_domain
*domains
;
3137 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3143 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3148 /* Copy event list into message payload */
3149 memcpy(cmd_ctx
->llm
->payload
, domains
,
3150 nb_dom
* sizeof(struct lttng_domain
));
3157 case LTTNG_LIST_CHANNELS
:
3160 struct lttng_channel
*channels
;
3162 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3163 cmd_ctx
->session
, &channels
);
3169 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3174 /* Copy event list into message payload */
3175 memcpy(cmd_ctx
->llm
->payload
, channels
,
3176 nb_chan
* sizeof(struct lttng_channel
));
3183 case LTTNG_LIST_EVENTS
:
3186 struct lttng_event
*events
= NULL
;
3188 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3189 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3195 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3200 /* Copy event list into message payload */
3201 memcpy(cmd_ctx
->llm
->payload
, events
,
3202 nb_event
* sizeof(struct lttng_event
));
3209 case LTTNG_LIST_SESSIONS
:
3211 session_lock_list();
3213 if (session_list_ptr
->count
== 0) {
3214 ret
= LTTCOMM_NO_SESSION
;
3215 session_unlock_list();
3219 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3220 session_list_ptr
->count
);
3222 session_unlock_list();
3226 /* Filled the session array */
3227 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3229 session_unlock_list();
3234 case LTTNG_CALIBRATE
:
3236 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3237 &cmd_ctx
->lsm
->u
.calibrate
);
3240 case LTTNG_REGISTER_CONSUMER
:
3242 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3243 cmd_ctx
->lsm
->u
.reg
.path
);
3252 if (cmd_ctx
->llm
== NULL
) {
3253 DBG("Missing llm structure. Allocating one.");
3254 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3258 /* Set return code */
3259 cmd_ctx
->llm
->ret_code
= ret
;
3261 if (cmd_ctx
->session
) {
3262 session_unlock(cmd_ctx
->session
);
3269 * This thread manage all clients request using the unix client socket for
3272 static void *thread_manage_clients(void *data
)
3274 int sock
= 0, ret
, i
, pollfd
;
3275 uint32_t revents
, nb_fd
;
3276 struct command_ctx
*cmd_ctx
= NULL
;
3277 struct lttng_poll_event events
;
3279 DBG("[thread] Manage client started");
3281 rcu_register_thread();
3283 ret
= lttcomm_listen_unix_sock(client_sock
);
3289 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3290 * more will be added to this poll set.
3292 ret
= create_thread_poll_set(&events
, 2);
3297 /* Add the application registration socket */
3298 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3304 * Notify parent pid that we are ready to accept command for client side.
3306 if (opt_sig_parent
) {
3307 kill(ppid
, SIGCHLD
);
3311 DBG("Accepting client command ...");
3313 nb_fd
= LTTNG_POLL_GETNB(&events
);
3315 /* Inifinite blocking call, waiting for transmission */
3316 ret
= lttng_poll_wait(&events
, -1);
3321 for (i
= 0; i
< nb_fd
; i
++) {
3322 /* Fetch once the poll data */
3323 revents
= LTTNG_POLL_GETEV(&events
, i
);
3324 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3326 /* Thread quit pipe has been closed. Killing thread. */
3327 ret
= check_thread_quit_pipe(pollfd
, revents
);
3332 /* Event on the registration socket */
3333 if (pollfd
== client_sock
) {
3334 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3335 ERR("Client socket poll error");
3341 DBG("Wait for client response");
3343 sock
= lttcomm_accept_unix_sock(client_sock
);
3348 /* Allocate context command to process the client request */
3349 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3350 if (cmd_ctx
== NULL
) {
3351 perror("zmalloc cmd_ctx");
3355 /* Allocate data buffer for reception */
3356 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3357 if (cmd_ctx
->lsm
== NULL
) {
3358 perror("zmalloc cmd_ctx->lsm");
3362 cmd_ctx
->llm
= NULL
;
3363 cmd_ctx
->session
= NULL
;
3366 * Data is received from the lttng client. The struct
3367 * lttcomm_session_msg (lsm) contains the command and data request of
3370 DBG("Receiving data from client ...");
3371 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3372 sizeof(struct lttcomm_session_msg
));
3374 DBG("Nothing recv() from client... continuing");
3380 // TODO: Validate cmd_ctx including sanity check for
3381 // security purpose.
3383 rcu_thread_online();
3385 * This function dispatch the work to the kernel or userspace tracer
3386 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3387 * informations for the client. The command context struct contains
3388 * everything this function may needs.
3390 ret
= process_client_msg(cmd_ctx
);
3391 rcu_thread_offline();
3394 * TODO: Inform client somehow of the fatal error. At
3395 * this point, ret < 0 means that a zmalloc failed
3396 * (ENOMEM). Error detected but still accept command.
3398 clean_command_ctx(&cmd_ctx
);
3402 DBG("Sending response (size: %d, retcode: %s)",
3403 cmd_ctx
->lttng_msg_size
,
3404 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3405 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3407 ERR("Failed to send data back to client");
3410 clean_command_ctx(&cmd_ctx
);
3412 /* End of transmission */
3417 DBG("Client thread dying");
3418 unlink(client_unix_sock_path
);
3422 lttng_poll_clean(&events
);
3423 clean_command_ctx(&cmd_ctx
);
3425 rcu_unregister_thread();
3431 * usage function on stderr
3433 static void usage(void)
3435 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3436 fprintf(stderr
, " -h, --help Display this usage.\n");
3437 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3438 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3439 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3440 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3441 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3442 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3443 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3444 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3445 fprintf(stderr
, " -V, --version Show version number.\n");
3446 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3447 fprintf(stderr
, " -q, --quiet No output at all.\n");
3448 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3449 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3453 * daemon argument parsing
3455 static int parse_args(int argc
, char **argv
)
3459 static struct option long_options
[] = {
3460 { "client-sock", 1, 0, 'c' },
3461 { "apps-sock", 1, 0, 'a' },
3462 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3463 { "kconsumerd-err-sock", 1, 0, 'E' },
3464 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3465 { "ustconsumerd-err-sock", 1, 0, 'F' },
3466 { "daemonize", 0, 0, 'd' },
3467 { "sig-parent", 0, 0, 'S' },
3468 { "help", 0, 0, 'h' },
3469 { "group", 1, 0, 'g' },
3470 { "version", 0, 0, 'V' },
3471 { "quiet", 0, 0, 'q' },
3472 { "verbose", 0, 0, 'v' },
3473 { "verbose-consumer", 0, 0, 'Z' },
3478 int option_index
= 0;
3479 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
3480 long_options
, &option_index
);
3487 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3489 fprintf(stderr
, " with arg %s\n", optarg
);
3493 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3496 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3502 opt_tracing_group
= strdup(optarg
);
3508 fprintf(stdout
, "%s\n", VERSION
);
3514 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3517 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3520 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3523 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3529 /* Verbose level can increase using multiple -v */
3533 opt_verbose_consumer
+= 1;
3536 /* Unknown option or other error.
3537 * Error is printed by getopt, just return */
3546 * Creates the two needed socket by the daemon.
3547 * apps_sock - The communication socket for all UST apps.
3548 * client_sock - The communication of the cli tool (lttng).
3550 static int init_daemon_socket(void)
3555 old_umask
= umask(0);
3557 /* Create client tool unix socket */
3558 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3559 if (client_sock
< 0) {
3560 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3565 /* File permission MUST be 660 */
3566 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3568 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3573 /* Create the application unix socket */
3574 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3575 if (apps_sock
< 0) {
3576 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3581 /* File permission MUST be 666 */
3582 ret
= chmod(apps_unix_sock_path
,
3583 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3585 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3596 * Check if the global socket is available, and if a daemon is answering at the
3597 * other side. If yes, error is returned.
3599 static int check_existing_daemon(void)
3601 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3602 access(apps_unix_sock_path
, F_OK
) < 0) {
3606 /* Is there anybody out there ? */
3607 if (lttng_session_daemon_alive()) {
3615 * Set the tracing group gid onto the client socket.
3617 * Race window between mkdir and chown is OK because we are going from more
3618 * permissive (root.root) to les permissive (root.tracing).
3620 static int set_permissions(void)
3625 gid
= allowed_group();
3628 WARN("No tracing group detected");
3631 ERR("Missing tracing group. Aborting execution.");
3637 /* Set lttng run dir */
3638 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3640 ERR("Unable to set group on " LTTNG_RUNDIR
);
3644 /* lttng client socket path */
3645 ret
= chown(client_unix_sock_path
, 0, gid
);
3647 ERR("Unable to set group on %s", client_unix_sock_path
);
3651 /* kconsumer error socket path */
3652 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3654 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3658 /* ustconsumer error socket path */
3659 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3661 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3665 DBG("All permissions are set");
3672 * Create the pipe used to wake up the kernel thread.
3674 static int create_kernel_poll_pipe(void)
3676 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3680 * Create the application command pipe to wake thread_manage_apps.
3682 static int create_apps_cmd_pipe(void)
3684 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3688 * Create the lttng run directory needed for all global sockets and pipe.
3690 static int create_lttng_rundir(void)
3694 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3696 if (errno
!= EEXIST
) {
3697 ERR("Unable to create " LTTNG_RUNDIR
);
3709 * Setup sockets and directory needed by the kconsumerd communication with the
3712 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3715 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3716 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3718 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3719 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3720 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3721 KCONSUMERD_ERR_SOCK_PATH
:
3722 USTCONSUMERD_ERR_SOCK_PATH
);
3725 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3726 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3727 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3728 KCONSUMERD_CMD_SOCK_PATH
:
3729 USTCONSUMERD_CMD_SOCK_PATH
);
3732 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3734 if (errno
!= EEXIST
) {
3735 ERR("Failed to create %s", path
);
3741 /* Create the kconsumerd error unix socket */
3742 consumer_data
->err_sock
=
3743 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3744 if (consumer_data
->err_sock
< 0) {
3745 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3750 /* File permission MUST be 660 */
3751 ret
= chmod(consumer_data
->err_unix_sock_path
,
3752 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3754 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3764 * Signal handler for the daemon
3766 * Simply stop all worker threads, leaving main() return gracefully after
3767 * joining all threads and calling cleanup().
3769 static void sighandler(int sig
)
3773 DBG("SIGPIPE catched");
3776 DBG("SIGINT catched");
3780 DBG("SIGTERM catched");
3789 * Setup signal handler for :
3790 * SIGINT, SIGTERM, SIGPIPE
3792 static int set_signal_handler(void)
3795 struct sigaction sa
;
3798 if ((ret
= sigemptyset(&sigset
)) < 0) {
3799 perror("sigemptyset");
3803 sa
.sa_handler
= sighandler
;
3804 sa
.sa_mask
= sigset
;
3806 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3807 perror("sigaction");
3811 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3812 perror("sigaction");
3816 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3817 perror("sigaction");
3821 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3827 * Set open files limit to unlimited. This daemon can open a large number of
3828 * file descriptors in order to consumer multiple kernel traces.
3830 static void set_ulimit(void)
3835 /* The kernel does not allowed an infinite limit for open files */
3836 lim
.rlim_cur
= 65535;
3837 lim
.rlim_max
= 65535;
3839 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3841 perror("failed to set open files limit");
3848 int main(int argc
, char **argv
)
3852 const char *home_path
;
3854 rcu_register_thread();
3856 /* Create thread quit pipe */
3857 if ((ret
= init_thread_quit_pipe()) < 0) {
3861 /* Parse arguments */
3863 if ((ret
= parse_args(argc
, argv
) < 0)) {
3876 /* Check if daemon is UID = 0 */
3877 is_root
= !getuid();
3880 ret
= create_lttng_rundir();
3885 if (strlen(apps_unix_sock_path
) == 0) {
3886 snprintf(apps_unix_sock_path
, PATH_MAX
,
3887 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3890 if (strlen(client_unix_sock_path
) == 0) {
3891 snprintf(client_unix_sock_path
, PATH_MAX
,
3892 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3895 /* Set global SHM for ust */
3896 if (strlen(wait_shm_path
) == 0) {
3897 snprintf(wait_shm_path
, PATH_MAX
,
3898 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3901 home_path
= get_home_dir();
3902 if (home_path
== NULL
) {
3903 /* TODO: Add --socket PATH option */
3904 ERR("Can't get HOME directory for sockets creation.");
3909 if (strlen(apps_unix_sock_path
) == 0) {
3910 snprintf(apps_unix_sock_path
, PATH_MAX
,
3911 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3914 /* Set the cli tool unix socket path */
3915 if (strlen(client_unix_sock_path
) == 0) {
3916 snprintf(client_unix_sock_path
, PATH_MAX
,
3917 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3920 /* Set global SHM for ust */
3921 if (strlen(wait_shm_path
) == 0) {
3922 snprintf(wait_shm_path
, PATH_MAX
,
3923 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3927 DBG("Client socket path %s", client_unix_sock_path
);
3928 DBG("Application socket path %s", apps_unix_sock_path
);
3931 * See if daemon already exist.
3933 if ((ret
= check_existing_daemon()) < 0) {
3934 ERR("Already running daemon.\n");
3936 * We do not goto exit because we must not cleanup()
3937 * because a daemon is already running.
3942 /* After this point, we can safely call cleanup() with "goto exit" */
3945 * These actions must be executed as root. We do that *after* setting up
3946 * the sockets path because we MUST make the check for another daemon using
3947 * those paths *before* trying to set the kernel consumer sockets and init
3951 ret
= set_consumer_sockets(&kconsumer_data
);
3956 ret
= set_consumer_sockets(&ustconsumer_data
);
3960 /* Setup kernel tracer */
3961 init_kernel_tracer();
3963 /* Set ulimit for open files */
3967 if ((ret
= set_signal_handler()) < 0) {
3971 /* Setup the needed unix socket */
3972 if ((ret
= init_daemon_socket()) < 0) {
3976 /* Set credentials to socket */
3977 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3981 /* Get parent pid if -S, --sig-parent is specified. */
3982 if (opt_sig_parent
) {
3986 /* Setup the kernel pipe for waking up the kernel thread */
3987 if ((ret
= create_kernel_poll_pipe()) < 0) {
3991 /* Setup the thread apps communication pipe. */
3992 if ((ret
= create_apps_cmd_pipe()) < 0) {
3996 /* Init UST command queue. */
3997 cds_wfq_init(&ust_cmd_queue
.queue
);
3999 /* Init UST app hash table */
4003 * Get session list pointer. This pointer MUST NOT be free(). This list is
4004 * statically declared in session.c
4006 session_list_ptr
= session_get_list();
4008 /* Set up max poll set size */
4009 lttng_poll_set_max_size();
4011 /* Create thread to manage the client socket */
4012 ret
= pthread_create(&client_thread
, NULL
,
4013 thread_manage_clients
, (void *) NULL
);
4015 perror("pthread_create clients");
4019 /* Create thread to dispatch registration */
4020 ret
= pthread_create(&dispatch_thread
, NULL
,
4021 thread_dispatch_ust_registration
, (void *) NULL
);
4023 perror("pthread_create dispatch");
4027 /* Create thread to manage application registration. */
4028 ret
= pthread_create(®_apps_thread
, NULL
,
4029 thread_registration_apps
, (void *) NULL
);
4031 perror("pthread_create registration");
4035 /* Create thread to manage application socket */
4036 ret
= pthread_create(&apps_thread
, NULL
,
4037 thread_manage_apps
, (void *) NULL
);
4039 perror("pthread_create apps");
4043 /* Create kernel thread to manage kernel event */
4044 ret
= pthread_create(&kernel_thread
, NULL
,
4045 thread_manage_kernel
, (void *) NULL
);
4047 perror("pthread_create kernel");
4051 ret
= pthread_join(kernel_thread
, &status
);
4053 perror("pthread_join");
4054 goto error
; /* join error, exit without cleanup */
4058 ret
= pthread_join(apps_thread
, &status
);
4060 perror("pthread_join");
4061 goto error
; /* join error, exit without cleanup */
4065 ret
= pthread_join(reg_apps_thread
, &status
);
4067 perror("pthread_join");
4068 goto error
; /* join error, exit without cleanup */
4072 ret
= pthread_join(dispatch_thread
, &status
);
4074 perror("pthread_join");
4075 goto error
; /* join error, exit without cleanup */
4079 ret
= pthread_join(client_thread
, &status
);
4081 perror("pthread_join");
4082 goto error
; /* join error, exit without cleanup */
4085 ret
= join_consumer_thread(&kconsumer_data
);
4087 perror("join_consumer");
4088 goto error
; /* join error, exit without cleanup */
4094 * cleanup() is called when no other thread is running.
4096 rcu_thread_online();
4098 rcu_thread_offline();
4099 rcu_unregister_thread();