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
;
161 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
163 static int create_thread_poll_set(struct lttng_poll_event
*events
,
168 if (events
== NULL
|| size
== 0) {
173 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
179 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
191 * Check if the thread quit pipe was triggered.
193 * Return 1 if it was triggered else 0;
195 static int check_thread_quit_pipe(int fd
, uint32_t events
)
197 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
205 * Remove modules in reverse load order.
207 static int modprobe_remove_kernel_modules(void)
212 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
213 ret
= snprintf(modprobe
, sizeof(modprobe
),
214 "/sbin/modprobe -r -q %s",
215 kernel_modules_list
[i
].name
);
217 perror("snprintf modprobe -r");
220 modprobe
[sizeof(modprobe
) - 1] = '\0';
221 ret
= system(modprobe
);
223 ERR("Unable to launch modprobe -r for module %s",
224 kernel_modules_list
[i
].name
);
225 } else if (kernel_modules_list
[i
].required
226 && WEXITSTATUS(ret
) != 0) {
227 ERR("Unable to remove module %s",
228 kernel_modules_list
[i
].name
);
230 DBG("Modprobe removal successful %s",
231 kernel_modules_list
[i
].name
);
240 * Return group ID of the tracing group or -1 if not found.
242 static gid_t
allowed_group(void)
246 if (opt_tracing_group
) {
247 grp
= getgrnam(opt_tracing_group
);
249 grp
= getgrnam(default_tracing_group
);
259 * Init thread quit pipe.
261 * Return -1 on error or 0 if all pipes are created.
263 static int init_thread_quit_pipe(void)
267 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
269 perror("thread quit pipe");
278 * Complete teardown of a kernel session. This free all data structure related
279 * to a kernel session and update counter.
281 static void teardown_kernel_session(struct ltt_session
*session
)
283 if (session
->kernel_session
!= NULL
) {
284 DBG("Tearing down kernel session");
287 * If a custom kernel consumer was registered, close the socket before
288 * tearing down the complete kernel session structure
290 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
291 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
294 trace_kernel_destroy_session(session
->kernel_session
);
295 /* Extra precaution */
296 session
->kernel_session
= NULL
;
301 * Complete teardown of all UST sessions. This will free everything on his path
302 * and destroy the core essence of all ust sessions :)
304 static void teardown_ust_session(struct ltt_session
*session
)
306 DBG("Tearing down UST session(s)");
308 trace_ust_destroy_session(session
->ust_session
);
312 * Stop all threads by closing the thread quit pipe.
314 static void stop_threads(void)
318 /* Stopping all threads */
319 DBG("Terminating all threads");
320 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
322 ERR("write error on thread quit pipe");
325 /* Dispatch thread */
326 dispatch_thread_exit
= 1;
327 futex_nto1_wake(&ust_cmd_queue
.futex
);
333 static void cleanup(void)
337 struct ltt_session
*sess
, *stmp
;
342 DBG("Removing %s directory", LTTNG_RUNDIR
);
343 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
345 ERR("asprintf failed. Something is really wrong!");
348 /* Remove lttng run directory */
351 ERR("Unable to clean " LTTNG_RUNDIR
);
355 DBG("Cleaning up all session");
357 /* Destroy session list mutex */
358 if (session_list_ptr
!= NULL
) {
359 pthread_mutex_destroy(&session_list_ptr
->lock
);
361 /* Cleanup ALL session */
362 cds_list_for_each_entry_safe(sess
, stmp
,
363 &session_list_ptr
->head
, list
) {
364 teardown_kernel_session(sess
);
365 teardown_ust_session(sess
);
370 DBG("Closing all UST sockets");
371 ust_app_clean_list();
373 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
375 DBG("Closing kernel fd");
376 close(kernel_tracer_fd
);
379 DBG("Unloading kernel modules");
380 modprobe_remove_kernel_modules();
383 close(thread_quit_pipe
[0]);
384 close(thread_quit_pipe
[1]);
387 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
388 "Matthew, BEET driven development works!%c[%dm",
389 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
394 * Send data on a unix socket using the liblttsessiondcomm API.
396 * Return lttcomm error code.
398 static int send_unix_sock(int sock
, void *buf
, size_t len
)
400 /* Check valid length */
405 return lttcomm_send_unix_sock(sock
, buf
, len
);
409 * Free memory of a command context structure.
411 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
413 DBG("Clean command context structure");
415 if ((*cmd_ctx
)->llm
) {
416 free((*cmd_ctx
)->llm
);
418 if ((*cmd_ctx
)->lsm
) {
419 free((*cmd_ctx
)->lsm
);
427 * Send all stream fds of kernel channel to the consumer.
429 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
430 int sock
, struct ltt_kernel_channel
*channel
)
433 struct ltt_kernel_stream
*stream
;
434 struct lttcomm_consumer_msg lkm
;
436 DBG("Sending streams of channel %s to kernel consumer",
437 channel
->channel
->name
);
440 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
441 lkm
.u
.channel
.channel_key
= channel
->fd
;
442 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
443 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
444 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
445 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
447 perror("send consumer channel");
452 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
456 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
457 lkm
.u
.stream
.channel_key
= channel
->fd
;
458 lkm
.u
.stream
.stream_key
= stream
->fd
;
459 lkm
.u
.stream
.state
= stream
->state
;
460 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
461 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
462 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
463 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
464 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
465 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
467 perror("send consumer stream");
470 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
472 perror("send consumer stream ancillary data");
477 DBG("consumer channel streams sent");
486 * Send all stream fds of the kernel session to the consumer.
488 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
489 struct ltt_kernel_session
*session
)
492 struct ltt_kernel_channel
*chan
;
493 struct lttcomm_consumer_msg lkm
;
494 int sock
= session
->consumer_fd
;
496 DBG("Sending metadata stream fd");
498 /* Extra protection. It's NOT supposed to be set to 0 at this point */
499 if (session
->consumer_fd
== 0) {
500 session
->consumer_fd
= consumer_data
->cmd_sock
;
503 if (session
->metadata_stream_fd
!= 0) {
504 /* Send metadata channel fd */
505 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
506 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
507 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
508 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
509 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
510 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
512 perror("send consumer channel");
516 /* Send metadata stream fd */
517 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
518 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
519 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
520 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
521 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
522 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
523 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
524 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
525 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
526 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
528 perror("send consumer stream");
531 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
533 perror("send consumer stream");
538 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
539 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
545 DBG("consumer fds (metadata and channel streams) sent");
554 * Notify UST applications using the shm mmap futex.
556 static int notify_ust_apps(int active
)
560 DBG("Notifying applications of session daemon state: %d", active
);
562 /* See shm.c for this call implying mmap, shm and futex calls */
563 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
564 if (wait_shm_mmap
== NULL
) {
568 /* Wake waiting process */
569 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
571 /* Apps notified successfully */
579 * Setup the outgoing data buffer for the response (llm) by allocating the
580 * right amount of memory and copying the original information from the lsm
583 * Return total size of the buffer pointed by buf.
585 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
591 cmd_ctx
->llm
= malloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
592 if (cmd_ctx
->llm
== NULL
) {
598 /* Copy common data */
599 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
600 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
602 cmd_ctx
->llm
->data_size
= size
;
603 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
612 * Update the kernel poll set of all channel fd available over all tracing
613 * session. Add the wakeup pipe at the end of the set.
615 static int update_kernel_poll(struct lttng_poll_event
*events
)
618 struct ltt_session
*session
;
619 struct ltt_kernel_channel
*channel
;
621 DBG("Updating kernel poll set");
624 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
625 session_lock(session
);
626 if (session
->kernel_session
== NULL
) {
627 session_unlock(session
);
631 cds_list_for_each_entry(channel
,
632 &session
->kernel_session
->channel_list
.head
, list
) {
633 /* Add channel fd to the kernel poll set */
634 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
636 session_unlock(session
);
639 DBG("Channel fd %d added to kernel set", channel
->fd
);
641 session_unlock(session
);
643 session_unlock_list();
648 session_unlock_list();
653 * Find the channel fd from 'fd' over all tracing session. When found, check
654 * for new channel stream and send those stream fds to the kernel consumer.
656 * Useful for CPU hotplug feature.
658 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
661 struct ltt_session
*session
;
662 struct ltt_kernel_channel
*channel
;
664 DBG("Updating kernel streams for channel fd %d", fd
);
667 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
668 session_lock(session
);
669 if (session
->kernel_session
== NULL
) {
670 session_unlock(session
);
674 /* This is not suppose to be 0 but this is an extra security check */
675 if (session
->kernel_session
->consumer_fd
== 0) {
676 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
679 cds_list_for_each_entry(channel
,
680 &session
->kernel_session
->channel_list
.head
, list
) {
681 if (channel
->fd
== fd
) {
682 DBG("Channel found, updating kernel streams");
683 ret
= kernel_open_channel_stream(channel
);
689 * Have we already sent fds to the consumer? If yes, it means
690 * that tracing is started so it is safe to send our updated
693 if (session
->kernel_session
->consumer_fds_sent
== 1) {
694 ret
= send_kconsumer_channel_streams(consumer_data
,
695 session
->kernel_session
->consumer_fd
, channel
);
703 session_unlock(session
);
705 session_unlock_list();
709 session_unlock(session
);
710 session_unlock_list();
715 * For each tracing session, update newly registered apps.
717 static void update_ust_app(int app_sock
)
719 struct ltt_session
*sess
, *stmp
;
721 /* For all tracing session(s) */
722 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
723 if (sess
->ust_session
) {
724 ust_app_global_update(sess
->ust_session
, app_sock
);
730 * This thread manage event coming from the kernel.
732 * Features supported in this thread:
735 static void *thread_manage_kernel(void *data
)
737 int ret
, i
, pollfd
, update_poll_flag
= 1;
738 uint32_t revents
, nb_fd
;
740 struct lttng_poll_event events
;
742 DBG("Thread manage kernel started");
744 ret
= create_thread_poll_set(&events
, 2);
749 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
755 if (update_poll_flag
== 1) {
757 * Reset number of fd in the poll set. Always 2 since there is the thread
758 * quit pipe and the kernel pipe.
762 ret
= update_kernel_poll(&events
);
766 update_poll_flag
= 0;
769 nb_fd
= LTTNG_POLL_GETNB(&events
);
771 DBG("Thread kernel polling on %d fds", nb_fd
);
773 /* Zeroed the poll events */
774 lttng_poll_reset(&events
);
776 /* Poll infinite value of time */
777 ret
= lttng_poll_wait(&events
, -1);
780 } else if (ret
== 0) {
781 /* Should not happen since timeout is infinite */
782 ERR("Return value of poll is 0 with an infinite timeout.\n"
783 "This should not have happened! Continuing...");
787 for (i
= 0; i
< nb_fd
; i
++) {
788 /* Fetch once the poll data */
789 revents
= LTTNG_POLL_GETEV(&events
, i
);
790 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
792 /* Thread quit pipe has been closed. Killing thread. */
793 ret
= check_thread_quit_pipe(pollfd
, revents
);
798 /* Check for data on kernel pipe */
799 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
800 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
801 update_poll_flag
= 1;
805 * New CPU detected by the kernel. Adding kernel stream to
806 * kernel session and updating the kernel consumer
808 if (revents
& LPOLLIN
) {
809 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
815 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
816 * and unregister kernel stream at this point.
824 DBG("Kernel thread dying");
825 close(kernel_poll_pipe
[0]);
826 close(kernel_poll_pipe
[1]);
828 lttng_poll_clean(&events
);
834 * This thread manage the consumer error sent back to the session daemon.
836 static void *thread_manage_consumer(void *data
)
838 int sock
= 0, i
, ret
, pollfd
;
839 uint32_t revents
, nb_fd
;
840 enum lttcomm_return_code code
;
841 struct lttng_poll_event events
;
842 struct consumer_data
*consumer_data
= data
;
844 DBG("[thread] Manage consumer started");
846 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
852 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
853 * Nothing more will be added to this poll set.
855 ret
= create_thread_poll_set(&events
, 2);
860 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
865 nb_fd
= LTTNG_POLL_GETNB(&events
);
867 /* Inifinite blocking call, waiting for transmission */
868 ret
= lttng_poll_wait(&events
, -1);
873 for (i
= 0; i
< nb_fd
; i
++) {
874 /* Fetch once the poll data */
875 revents
= LTTNG_POLL_GETEV(&events
, i
);
876 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
878 /* Thread quit pipe has been closed. Killing thread. */
879 ret
= check_thread_quit_pipe(pollfd
, revents
);
884 /* Event on the registration socket */
885 if (pollfd
== consumer_data
->err_sock
) {
886 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
887 ERR("consumer err socket poll error");
893 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
898 DBG2("Receiving code from consumer err_sock");
900 /* Getting status code from kconsumerd */
901 ret
= lttcomm_recv_unix_sock(sock
, &code
,
902 sizeof(enum lttcomm_return_code
));
907 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
908 consumer_data
->cmd_sock
=
909 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
910 if (consumer_data
->cmd_sock
< 0) {
911 sem_post(&consumer_data
->sem
);
912 PERROR("consumer connect");
915 /* Signal condition to tell that the kconsumerd is ready */
916 sem_post(&consumer_data
->sem
);
917 DBG("consumer command socket ready");
919 ERR("consumer error when waiting for SOCK_READY : %s",
920 lttcomm_get_readable_code(-code
));
924 /* Remove the kconsumerd error sock since we've established a connexion */
925 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
930 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
935 /* Update number of fd */
936 nb_fd
= LTTNG_POLL_GETNB(&events
);
938 /* Inifinite blocking call, waiting for transmission */
939 ret
= lttng_poll_wait(&events
, -1);
944 for (i
= 0; i
< nb_fd
; i
++) {
945 /* Fetch once the poll data */
946 revents
= LTTNG_POLL_GETEV(&events
, i
);
947 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
949 /* Thread quit pipe has been closed. Killing thread. */
950 ret
= check_thread_quit_pipe(pollfd
, revents
);
955 /* Event on the kconsumerd socket */
956 if (pollfd
== sock
) {
957 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
958 ERR("consumer err socket second poll error");
964 /* Wait for any kconsumerd error */
965 ret
= lttcomm_recv_unix_sock(sock
, &code
,
966 sizeof(enum lttcomm_return_code
));
968 ERR("consumer closed the command socket");
972 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
975 DBG("consumer thread dying");
976 close(consumer_data
->err_sock
);
977 close(consumer_data
->cmd_sock
);
980 unlink(consumer_data
->err_unix_sock_path
);
981 unlink(consumer_data
->cmd_unix_sock_path
);
982 consumer_data
->pid
= 0;
984 lttng_poll_clean(&events
);
990 * This thread manage application communication.
992 static void *thread_manage_apps(void *data
)
995 uint32_t revents
, nb_fd
;
996 struct ust_command ust_cmd
;
997 struct lttng_poll_event events
;
999 DBG("[thread] Manage application started");
1001 rcu_register_thread();
1002 rcu_thread_online();
1004 ret
= create_thread_poll_set(&events
, 2);
1009 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1015 /* Zeroed the events structure */
1016 lttng_poll_reset(&events
);
1018 nb_fd
= LTTNG_POLL_GETNB(&events
);
1020 DBG("Apps thread polling on %d fds", nb_fd
);
1022 /* Inifinite blocking call, waiting for transmission */
1023 ret
= lttng_poll_wait(&events
, -1);
1028 for (i
= 0; i
< nb_fd
; i
++) {
1029 /* Fetch once the poll data */
1030 revents
= LTTNG_POLL_GETEV(&events
, i
);
1031 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1033 /* Thread quit pipe has been closed. Killing thread. */
1034 ret
= check_thread_quit_pipe(pollfd
, revents
);
1039 /* Inspect the apps cmd pipe */
1040 if (pollfd
== apps_cmd_pipe
[0]) {
1041 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1042 ERR("Apps command pipe error");
1044 } else if (revents
& LPOLLIN
) {
1046 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1047 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1048 perror("read apps cmd pipe");
1052 /* Register applicaton to the session daemon */
1053 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1056 /* Only critical ENOMEM error can be returned here */
1061 * Add channel(s) and event(s) to newly registered apps
1062 * from lttng global UST domain.
1064 update_ust_app(ust_cmd
.sock
);
1066 ret
= ustctl_register_done(ust_cmd
.sock
);
1069 * If the registration is not possible, we simply
1070 * unregister the apps and continue
1072 ust_app_unregister(ust_cmd
.sock
);
1075 * We just need here to monitor the close of the UST
1076 * socket and poll set monitor those by default.
1078 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1083 DBG("Apps with sock %d added to poll set",
1091 * At this point, we know that a registered application made
1092 * the event at poll_wait.
1094 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1095 /* Removing from the poll set */
1096 ret
= lttng_poll_del(&events
, pollfd
);
1101 /* Socket closed on remote end. */
1102 ust_app_unregister(pollfd
);
1110 DBG("Application communication apps dying");
1111 close(apps_cmd_pipe
[0]);
1112 close(apps_cmd_pipe
[1]);
1114 lttng_poll_clean(&events
);
1116 rcu_thread_offline();
1117 rcu_unregister_thread();
1122 * Dispatch request from the registration threads to the application
1123 * communication thread.
1125 static void *thread_dispatch_ust_registration(void *data
)
1128 struct cds_wfq_node
*node
;
1129 struct ust_command
*ust_cmd
= NULL
;
1131 DBG("[thread] Dispatch UST command started");
1133 while (!dispatch_thread_exit
) {
1134 /* Atomically prepare the queue futex */
1135 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1138 /* Dequeue command for registration */
1139 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1141 DBG("Woken up but nothing in the UST command queue");
1142 /* Continue thread execution */
1146 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1148 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1149 " gid:%d sock:%d name:%s (version %d.%d)",
1150 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1151 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1152 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1153 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1155 * Inform apps thread of the new application registration. This
1156 * call is blocking so we can be assured that the data will be read
1157 * at some point in time or wait to the end of the world :)
1159 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1160 sizeof(struct ust_command
));
1162 perror("write apps cmd pipe");
1163 if (errno
== EBADF
) {
1165 * We can't inform the application thread to process
1166 * registration. We will exit or else application
1167 * registration will not occur and tracing will never
1174 } while (node
!= NULL
);
1176 /* Futex wait on queue. Blocking call on futex() */
1177 futex_nto1_wait(&ust_cmd_queue
.futex
);
1181 DBG("Dispatch thread dying");
1186 * This thread manage application registration.
1188 static void *thread_registration_apps(void *data
)
1190 int sock
= 0, i
, ret
, pollfd
;
1191 uint32_t revents
, nb_fd
;
1192 struct lttng_poll_event events
;
1194 * Get allocated in this thread, enqueued to a global queue, dequeued and
1195 * freed in the manage apps thread.
1197 struct ust_command
*ust_cmd
= NULL
;
1199 DBG("[thread] Manage application registration started");
1201 ret
= lttcomm_listen_unix_sock(apps_sock
);
1207 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1208 * more will be added to this poll set.
1210 ret
= create_thread_poll_set(&events
, 2);
1215 /* Add the application registration socket */
1216 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1221 /* Notify all applications to register */
1222 ret
= notify_ust_apps(1);
1224 ERR("Failed to notify applications or create the wait shared memory.\n"
1225 "Execution continues but there might be problem for already\n"
1226 "running applications that wishes to register.");
1230 DBG("Accepting application registration");
1232 nb_fd
= LTTNG_POLL_GETNB(&events
);
1234 /* Inifinite blocking call, waiting for transmission */
1235 ret
= lttng_poll_wait(&events
, -1);
1240 for (i
= 0; i
< nb_fd
; i
++) {
1241 /* Fetch once the poll data */
1242 revents
= LTTNG_POLL_GETEV(&events
, i
);
1243 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1245 /* Thread quit pipe has been closed. Killing thread. */
1246 ret
= check_thread_quit_pipe(pollfd
, revents
);
1251 /* Event on the registration socket */
1252 if (pollfd
== apps_sock
) {
1253 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1254 ERR("Register apps socket poll error");
1256 } else if (revents
& LPOLLIN
) {
1257 sock
= lttcomm_accept_unix_sock(apps_sock
);
1262 /* Create UST registration command for enqueuing */
1263 ust_cmd
= malloc(sizeof(struct ust_command
));
1264 if (ust_cmd
== NULL
) {
1265 perror("ust command malloc");
1270 * Using message-based transmissions to ensure we don't
1271 * have to deal with partially received messages.
1273 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1274 sizeof(struct ust_register_msg
));
1275 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1277 perror("lttcomm_recv_unix_sock register apps");
1279 ERR("Wrong size received on apps register");
1286 ust_cmd
->sock
= sock
;
1288 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1289 " gid:%d sock:%d name:%s (version %d.%d)",
1290 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1291 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1292 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1293 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1296 * Lock free enqueue the registration request. The red pill
1297 * has been taken! This apps will be part of the *system*.
1299 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1302 * Wake the registration queue futex. Implicit memory
1303 * barrier with the exchange in cds_wfq_enqueue.
1305 futex_nto1_wake(&ust_cmd_queue
.futex
);
1312 DBG("UST Registration thread dying");
1314 /* Notify that the registration thread is gone */
1319 unlink(apps_unix_sock_path
);
1321 lttng_poll_clean(&events
);
1327 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1328 * exec or it will fails.
1330 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1333 struct timespec timeout
;
1335 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1336 timeout
.tv_nsec
= 0;
1338 /* Setup semaphore */
1339 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1341 PERROR("sem_init consumer semaphore");
1345 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1346 thread_manage_consumer
, consumer_data
);
1348 PERROR("pthread_create consumer");
1353 /* Get time for sem_timedwait absolute timeout */
1354 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1356 PERROR("clock_gettime spawn consumer");
1357 /* Infinite wait for the kconsumerd thread to be ready */
1358 ret
= sem_wait(&consumer_data
->sem
);
1360 /* Normal timeout if the gettime was successful */
1361 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1362 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1366 if (errno
== ETIMEDOUT
) {
1368 * Call has timed out so we kill the kconsumerd_thread and return
1371 ERR("The consumer thread was never ready. Killing it");
1372 ret
= pthread_cancel(consumer_data
->thread
);
1374 PERROR("pthread_cancel consumer thread");
1377 PERROR("semaphore wait failed consumer thread");
1382 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1383 if (consumer_data
->pid
== 0) {
1384 ERR("Kconsumerd did not start");
1385 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1388 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1397 * Join consumer thread
1399 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1404 if (consumer_data
->pid
!= 0) {
1405 ret
= kill(consumer_data
->pid
, SIGTERM
);
1407 ERR("Error killing consumer daemon");
1410 return pthread_join(consumer_data
->thread
, &status
);
1417 * Fork and exec a consumer daemon (consumerd).
1419 * Return pid if successful else -1.
1421 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1425 const char *verbosity
;
1427 DBG("Spawning consumerd");
1434 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1435 verbosity
= "--verbose";
1437 verbosity
= "--quiet";
1439 switch (consumer_data
->type
) {
1440 case LTTNG_CONSUMER_KERNEL
:
1441 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1442 "lttng-consumerd", verbosity
, "-k", NULL
);
1444 case LTTNG_CONSUMER_UST
:
1445 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1446 "lttng-consumerd", verbosity
, "-u", NULL
);
1449 perror("unknown consumer type");
1453 perror("kernel start consumer exec");
1456 } else if (pid
> 0) {
1459 perror("start consumer fork");
1466 * Spawn the consumerd daemon and session daemon thread.
1468 static int start_consumerd(struct consumer_data
*consumer_data
)
1472 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1473 if (consumer_data
->pid
!= 0) {
1474 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1478 ret
= spawn_consumerd(consumer_data
);
1480 ERR("Spawning consumerd failed");
1481 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1485 /* Setting up the consumer_data pid */
1486 consumer_data
->pid
= ret
;
1487 DBG2("Consumer pid %d", consumer_data
->pid
);
1488 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1490 DBG2("Spawning consumer control thread");
1491 ret
= spawn_consumer_thread(consumer_data
);
1493 ERR("Fatal error spawning consumer control thread");
1505 * modprobe_kernel_modules
1507 static int modprobe_kernel_modules(void)
1512 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1513 ret
= snprintf(modprobe
, sizeof(modprobe
),
1514 "/sbin/modprobe %s%s",
1515 kernel_modules_list
[i
].required
? "" : "-q ",
1516 kernel_modules_list
[i
].name
);
1518 perror("snprintf modprobe");
1521 modprobe
[sizeof(modprobe
) - 1] = '\0';
1522 ret
= system(modprobe
);
1524 ERR("Unable to launch modprobe for module %s",
1525 kernel_modules_list
[i
].name
);
1526 } else if (kernel_modules_list
[i
].required
1527 && WEXITSTATUS(ret
) != 0) {
1528 ERR("Unable to load module %s",
1529 kernel_modules_list
[i
].name
);
1531 DBG("Modprobe successfully %s",
1532 kernel_modules_list
[i
].name
);
1543 static int mount_debugfs(char *path
)
1546 char *type
= "debugfs";
1548 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1550 PERROR("Cannot create debugfs path");
1554 ret
= mount(type
, path
, type
, 0, NULL
);
1556 PERROR("Cannot mount debugfs");
1560 DBG("Mounted debugfs successfully at %s", path
);
1567 * Setup necessary data for kernel tracer action.
1569 static void init_kernel_tracer(void)
1572 char *proc_mounts
= "/proc/mounts";
1574 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1577 /* Detect debugfs */
1578 fp
= fopen(proc_mounts
, "r");
1580 ERR("Unable to probe %s", proc_mounts
);
1584 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1585 if (strstr(line
, "debugfs") != NULL
) {
1586 /* Remove first string */
1588 /* Dup string here so we can reuse line later on */
1589 debugfs_path
= strdup(strtok(NULL
, " "));
1590 DBG("Got debugfs path : %s", debugfs_path
);
1597 /* Mount debugfs if needded */
1598 if (debugfs_path
== NULL
) {
1599 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1601 perror("asprintf debugfs path");
1604 ret
= mount_debugfs(debugfs_path
);
1606 perror("Cannot mount debugfs");
1611 /* Modprobe lttng kernel modules */
1612 ret
= modprobe_kernel_modules();
1617 /* Setup lttng kernel path */
1618 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1620 perror("asprintf lttng path");
1624 /* Open debugfs lttng */
1625 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1626 if (kernel_tracer_fd
< 0) {
1627 DBG("Failed to open %s", lttng_path
);
1633 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1643 WARN("No kernel tracer available");
1644 kernel_tracer_fd
= 0;
1649 * Init tracing by creating trace directory and sending fds kernel consumer.
1651 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1655 if (session
->consumer_fds_sent
== 0) {
1657 * Assign default kernel consumer socket if no consumer assigned to the
1658 * kernel session. At this point, it's NOT suppose to be 0 but this is
1659 * an extra security check.
1661 if (session
->consumer_fd
== 0) {
1662 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1665 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1667 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1671 session
->consumer_fds_sent
= 1;
1679 * Create an UST session and add it to the session ust list.
1681 static int create_ust_session(struct ltt_session
*session
,
1682 struct lttng_domain
*domain
)
1686 struct ltt_ust_session
*lus
= NULL
;
1688 switch (domain
->type
) {
1689 case LTTNG_DOMAIN_UST
:
1692 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1696 DBG("Creating UST session");
1698 session_lock_list();
1699 uid
= session_list_ptr
->count
;
1700 session_unlock_list();
1702 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1704 ret
= LTTCOMM_UST_SESS_FAIL
;
1708 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1709 geteuid(), allowed_group());
1711 if (ret
!= -EEXIST
) {
1712 ERR("Trace directory creation error");
1713 ret
= LTTCOMM_UST_SESS_FAIL
;
1718 /* The domain type dictate different actions on session creation */
1719 switch (domain
->type
) {
1720 case LTTNG_DOMAIN_UST
:
1721 /* No ustctl for the global UST domain */
1724 ERR("Unknown UST domain on create session %d", domain
->type
);
1727 session
->ust_session
= lus
;
1737 * Create a kernel tracer session then create the default channel.
1739 static int create_kernel_session(struct ltt_session
*session
)
1743 DBG("Creating kernel session");
1745 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1747 ret
= LTTCOMM_KERN_SESS_FAIL
;
1751 /* Set kernel consumer socket fd */
1752 if (kconsumer_data
.cmd_sock
) {
1753 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1756 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1757 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1759 if (ret
!= -EEXIST
) {
1760 ERR("Trace directory creation error");
1770 * Using the session list, filled a lttng_session array to send back to the
1771 * client for session listing.
1773 * The session list lock MUST be acquired before calling this function. Use
1774 * session_lock_list() and session_unlock_list().
1776 static void list_lttng_sessions(struct lttng_session
*sessions
)
1779 struct ltt_session
*session
;
1781 DBG("Getting all available session");
1783 * Iterate over session list and append data after the control struct in
1786 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1787 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1788 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1789 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1790 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1796 * Fill lttng_channel array of all channels.
1798 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1799 struct lttng_channel
*channels
)
1802 struct ltt_kernel_channel
*kchan
;
1804 DBG("Listing channels for session %s", session
->name
);
1807 case LTTNG_DOMAIN_KERNEL
:
1808 /* Kernel channels */
1809 if (session
->kernel_session
!= NULL
) {
1810 cds_list_for_each_entry(kchan
,
1811 &session
->kernel_session
->channel_list
.head
, list
) {
1812 /* Copy lttng_channel struct to array */
1813 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1814 channels
[i
].enabled
= kchan
->enabled
;
1819 case LTTNG_DOMAIN_UST
:
1821 struct cds_lfht_iter iter
;
1822 struct ltt_ust_channel
*uchan
;
1824 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1825 &iter
, uchan
, node
) {
1826 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1827 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1828 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1829 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1830 channels
[i
].attr
.switch_timer_interval
=
1831 uchan
->attr
.switch_timer_interval
;
1832 channels
[i
].attr
.read_timer_interval
=
1833 uchan
->attr
.read_timer_interval
;
1834 channels
[i
].attr
.output
= uchan
->attr
.output
;
1844 * Create a list of ust global domain events.
1846 static int list_lttng_ust_global_events(char *channel_name
,
1847 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1850 unsigned int nb_event
= 0;
1851 struct cds_lfht_iter iter
;
1852 struct ltt_ust_channel
*uchan
;
1853 struct ltt_ust_event
*uevent
;
1854 struct lttng_event
*tmp
;
1856 DBG("Listing UST global events for channel %s", channel_name
);
1860 /* Count events in all channels */
1861 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1862 nb_event
+= hashtable_get_count(uchan
->events
);
1865 if (nb_event
== 0) {
1870 DBG3("Listing UST global %d events", nb_event
);
1872 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1874 ret
= -LTTCOMM_FATAL
;
1878 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1879 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
1880 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
1881 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1882 tmp
[i
].enabled
= uevent
->enabled
;
1883 switch (uevent
->attr
.instrumentation
) {
1884 case LTTNG_UST_TRACEPOINT
:
1885 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1887 case LTTNG_UST_PROBE
:
1888 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
1890 case LTTNG_UST_FUNCTION
:
1891 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
1907 * Fill lttng_event array of all kernel events in the channel.
1909 static int list_lttng_kernel_events(char *channel_name
,
1910 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
1913 unsigned int nb_event
;
1914 struct ltt_kernel_event
*event
;
1915 struct ltt_kernel_channel
*kchan
;
1917 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
1918 if (kchan
== NULL
) {
1919 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
1923 nb_event
= kchan
->event_count
;
1925 DBG("Listing events for channel %s", kchan
->channel
->name
);
1927 if (nb_event
== 0) {
1932 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1933 if (*events
== NULL
) {
1934 ret
= LTTCOMM_FATAL
;
1938 /* Kernel channels */
1939 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
1940 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
1941 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1942 (*events
)[i
].enabled
= event
->enabled
;
1943 switch (event
->event
->instrumentation
) {
1944 case LTTNG_KERNEL_TRACEPOINT
:
1945 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1947 case LTTNG_KERNEL_KPROBE
:
1948 case LTTNG_KERNEL_KRETPROBE
:
1949 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
1950 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
1951 sizeof(struct lttng_kernel_kprobe
));
1953 case LTTNG_KERNEL_FUNCTION
:
1954 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
1955 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
1956 sizeof(struct lttng_kernel_function
));
1958 case LTTNG_KERNEL_NOOP
:
1959 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
1961 case LTTNG_KERNEL_SYSCALL
:
1962 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
1964 case LTTNG_KERNEL_ALL
:
1978 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
1980 static int cmd_disable_channel(struct ltt_session
*session
,
1981 int domain
, char *channel_name
)
1986 case LTTNG_DOMAIN_KERNEL
:
1987 ret
= channel_kernel_disable(session
->kernel_session
,
1989 if (ret
!= LTTCOMM_OK
) {
1993 kernel_wait_quiescent(kernel_tracer_fd
);
1995 case LTTNG_DOMAIN_UST_PID
:
1998 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2009 * Copy channel from attributes and set it in the application channel list.
2012 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2013 struct lttng_channel *attr, struct ust_app *app)
2016 struct ltt_ust_channel *uchan, *new_chan;
2018 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2019 if (uchan == NULL) {
2020 ret = LTTCOMM_FATAL;
2024 new_chan = trace_ust_create_channel(attr, usess->path);
2025 if (new_chan == NULL) {
2026 PERROR("malloc ltt_ust_channel");
2027 ret = LTTCOMM_FATAL;
2031 ret = channel_ust_copy(new_chan, uchan);
2033 ret = LTTCOMM_FATAL;
2043 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2045 static int cmd_enable_channel(struct ltt_session
*session
,
2046 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
2049 struct ltt_ust_session
*usess
= session
->ust_session
;
2051 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2053 switch (domain
->type
) {
2054 case LTTNG_DOMAIN_KERNEL
:
2056 struct ltt_kernel_channel
*kchan
;
2058 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2059 session
->kernel_session
);
2060 if (kchan
== NULL
) {
2061 ret
= channel_kernel_create(session
->kernel_session
,
2062 attr
, kernel_poll_pipe
[1]);
2064 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2067 if (ret
!= LTTCOMM_OK
) {
2071 kernel_wait_quiescent(kernel_tracer_fd
);
2074 case LTTNG_DOMAIN_UST
:
2076 struct ltt_ust_channel
*uchan
;
2078 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2080 /* Get channel in global UST domain HT */
2081 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2083 if (uchan
== NULL
) {
2084 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2085 if (uchan
== NULL
) {
2086 ret
= LTTCOMM_UST_CHAN_FAIL
;
2091 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2093 DBG2("UST channel %s added to global domain HT", attr
->name
);
2095 ret
= LTTCOMM_UST_CHAN_EXIST
;
2099 /* Add channel to all registered applications */
2100 ret
= ust_app_create_channel_all(usess
, uchan
);
2109 case LTTNG_DOMAIN_UST_PID
:
2113 struct ltt_ust_channel *uchan;
2114 struct ltt_ust_session *usess;
2115 struct ust_app *app;
2117 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2119 if (usess == NULL) {
2120 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2124 app = ust_app_get_by_pid(domain->attr.pid);
2126 ret = LTTCOMM_APP_NOT_FOUND;
2131 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2132 if (uchan == NULL) {
2133 ret = channel_ust_create(usess, attr, sock);
2135 ret = channel_ust_enable(usess, uchan, sock);
2138 if (ret != LTTCOMM_OK) {
2142 ret = copy_ust_channel_to_app(usess, attr, app);
2143 if (ret != LTTCOMM_OK) {
2147 DBG("UST channel %s created for app sock %d with pid %d",
2148 attr->name, app->sock, domain->attr.pid);
2150 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2154 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2165 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2167 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2168 char *channel_name
, char *event_name
)
2173 case LTTNG_DOMAIN_KERNEL
:
2175 struct ltt_kernel_channel
*kchan
;
2177 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2178 session
->kernel_session
);
2179 if (kchan
== NULL
) {
2180 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2184 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2185 if (ret
!= LTTCOMM_OK
) {
2189 kernel_wait_quiescent(kernel_tracer_fd
);
2192 case LTTNG_DOMAIN_UST
:
2193 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2194 case LTTNG_DOMAIN_UST_PID
:
2195 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2197 /* TODO: Other UST domains */
2198 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2209 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2211 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2215 struct ltt_kernel_channel
*kchan
;
2218 case LTTNG_DOMAIN_KERNEL
:
2219 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2220 session
->kernel_session
);
2221 if (kchan
== NULL
) {
2222 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2226 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2227 if (ret
!= LTTCOMM_OK
) {
2231 kernel_wait_quiescent(kernel_tracer_fd
);
2234 /* TODO: Userspace tracing */
2235 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2246 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2248 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2249 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2254 case LTTNG_DOMAIN_KERNEL
:
2255 /* Add kernel context to kernel tracer */
2256 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2257 event_name
, channel_name
);
2258 if (ret
!= LTTCOMM_OK
) {
2262 case LTTNG_DOMAIN_UST
:
2265 struct ltt_ust_session *usess;
2267 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2268 ret = context_ust_add(usess, ctx,
2269 event_name, channel_name, domain);
2270 if (ret != LTTCOMM_OK) {
2278 /* TODO: UST other domains */
2279 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2290 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2292 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2293 char *channel_name
, struct lttng_event
*event
)
2296 struct lttng_channel
*attr
;
2297 struct ltt_ust_session
*usess
= session
->ust_session
;
2300 case LTTNG_DOMAIN_KERNEL
:
2302 struct ltt_kernel_channel
*kchan
;
2304 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2305 session
->kernel_session
);
2306 if (kchan
== NULL
) {
2307 attr
= channel_new_default_attr(domain
);
2309 ret
= LTTCOMM_FATAL
;
2312 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2314 /* This call will notify the kernel thread */
2315 ret
= channel_kernel_create(session
->kernel_session
,
2316 attr
, kernel_poll_pipe
[1]);
2317 if (ret
!= LTTCOMM_OK
) {
2322 /* Get the newly created kernel channel pointer */
2323 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2324 session
->kernel_session
);
2325 if (kchan
== NULL
) {
2326 /* This sould not happen... */
2327 ret
= LTTCOMM_FATAL
;
2331 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2333 if (ret
!= LTTCOMM_OK
) {
2337 kernel_wait_quiescent(kernel_tracer_fd
);
2340 case LTTNG_DOMAIN_UST
:
2342 struct ltt_ust_channel
*uchan
;
2343 struct ltt_ust_event
*uevent
;
2345 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2347 if (uchan
== NULL
) {
2348 /* TODO: Create default channel */
2349 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2353 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2354 if (uevent
== NULL
) {
2355 uevent
= trace_ust_create_event(event
);
2356 if (uevent
== NULL
) {
2357 ret
= LTTCOMM_FATAL
;
2363 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2365 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2369 /* Add ltt ust event to channel */
2371 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2374 uevent
->enabled
= 1;
2376 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
2380 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2381 case LTTNG_DOMAIN_UST_PID
:
2382 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2384 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2395 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2397 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2398 char *channel_name
, int event_type
)
2401 struct ltt_kernel_channel
*kchan
;
2404 case LTTNG_DOMAIN_KERNEL
:
2405 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2406 session
->kernel_session
);
2407 if (kchan
== NULL
) {
2408 /* This call will notify the kernel thread */
2409 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2410 kernel_poll_pipe
[1]);
2411 if (ret
!= LTTCOMM_OK
) {
2416 /* Get the newly created kernel channel pointer */
2417 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2418 session
->kernel_session
);
2419 if (kchan
== NULL
) {
2420 /* This sould not happen... */
2421 ret
= LTTCOMM_FATAL
;
2425 switch (event_type
) {
2426 case LTTNG_KERNEL_SYSCALL
:
2427 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2428 kchan
, kernel_tracer_fd
);
2430 case LTTNG_KERNEL_TRACEPOINT
:
2432 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2433 * events already registered to the channel.
2435 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2436 kchan
, kernel_tracer_fd
);
2438 case LTTNG_KERNEL_ALL
:
2439 /* Enable syscalls and tracepoints */
2440 ret
= event_kernel_enable_all(session
->kernel_session
,
2441 kchan
, kernel_tracer_fd
);
2444 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2447 if (ret
!= LTTCOMM_OK
) {
2451 kernel_wait_quiescent(kernel_tracer_fd
);
2454 /* TODO: Userspace tracing */
2455 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2466 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2468 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2471 ssize_t nb_events
= 0;
2474 case LTTNG_DOMAIN_KERNEL
:
2475 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2476 if (nb_events
< 0) {
2477 ret
= LTTCOMM_KERN_LIST_FAIL
;
2481 case LTTNG_DOMAIN_UST
:
2482 nb_events
= ust_app_list_events(events
);
2483 if (nb_events
< 0) {
2484 ret
= LTTCOMM_UST_LIST_FAIL
;
2489 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2496 /* Return negative value to differentiate return code */
2501 * Command LTTNG_START_TRACE processed by the client thread.
2503 static int cmd_start_trace(struct ltt_session
*session
)
2506 struct ltt_kernel_session
*ksession
;
2507 struct ltt_ust_session
*usess
;
2510 ksession
= session
->kernel_session
;
2511 usess
= session
->ust_session
;
2513 /* Kernel tracing */
2514 if (ksession
!= NULL
) {
2515 struct ltt_kernel_channel
*kchan
;
2517 /* Open kernel metadata */
2518 if (ksession
->metadata
== NULL
) {
2519 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2521 ret
= LTTCOMM_KERN_META_FAIL
;
2526 /* Open kernel metadata stream */
2527 if (ksession
->metadata_stream_fd
== 0) {
2528 ret
= kernel_open_metadata_stream(ksession
);
2530 ERR("Kernel create metadata stream failed");
2531 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2536 /* For each channel */
2537 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2538 if (kchan
->stream_count
== 0) {
2539 ret
= kernel_open_channel_stream(kchan
);
2541 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2544 /* Update the stream global counter */
2545 ksession
->stream_count_global
+= ret
;
2549 /* Setup kernel consumer socket and send fds to it */
2550 ret
= init_kernel_tracing(ksession
);
2552 ret
= LTTCOMM_KERN_START_FAIL
;
2556 /* This start the kernel tracing */
2557 ret
= kernel_start_session(ksession
);
2559 ret
= LTTCOMM_KERN_START_FAIL
;
2563 /* Quiescent wait after starting trace */
2564 kernel_wait_quiescent(kernel_tracer_fd
);
2567 /* Flag session that trace should start automatically */
2569 usess
->start_trace
= 1;
2571 ret
= ust_app_start_trace_all(usess
);
2573 ret
= LTTCOMM_UST_START_FAIL
;
2585 * Command LTTNG_STOP_TRACE processed by the client thread.
2587 static int cmd_stop_trace(struct ltt_session
*session
)
2590 struct ltt_kernel_channel
*kchan
;
2591 struct ltt_kernel_session
*ksession
;
2592 //struct ltt_ust_session *usess;
2593 //struct ltt_ust_channel *ustchan;
2596 ksession
= session
->kernel_session
;
2599 if (ksession
!= NULL
) {
2600 DBG("Stop kernel tracing");
2602 /* Flush all buffers before stopping */
2603 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2605 ERR("Kernel metadata flush failed");
2608 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2609 ret
= kernel_flush_buffer(kchan
);
2611 ERR("Kernel flush buffer error");
2615 ret
= kernel_stop_session(ksession
);
2617 ret
= LTTCOMM_KERN_STOP_FAIL
;
2621 kernel_wait_quiescent(kernel_tracer_fd
);
2625 /* Stop each UST session */
2626 DBG("Stop UST tracing");
2627 cds_list_for_each_entry(usess
, &session
->ust_session_list
.head
, list
) {
2628 /* Flush all buffers before stopping */
2629 ret
= ustctl_flush_buffer(usess
->sock
, usess
->metadata
->obj
);
2631 ERR("UST metadata flush failed");
2634 cds_list_for_each_entry(ustchan
, &usess
->channels
.head
, list
) {
2635 ret
= ustctl_flush_buffer(usess
->sock
, ustchan
->obj
);
2637 ERR("UST flush buffer error");
2641 ret
= ustctl_stop_session(usess
->sock
, usess
->handle
);
2643 ret
= LTTCOMM_KERN_STOP_FAIL
;
2647 ustctl_wait_quiescent(usess
->sock
);
2658 * Command LTTNG_CREATE_SESSION processed by the client thread.
2660 static int cmd_create_session(char *name
, char *path
)
2664 ret
= session_create(name
, path
);
2665 if (ret
!= LTTCOMM_OK
) {
2676 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2678 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2682 /* Clean kernel session teardown */
2683 teardown_kernel_session(session
);
2686 * Must notify the kernel thread here to update it's poll setin order
2687 * to remove the channel(s)' fd just destroyed.
2689 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2691 perror("write kernel poll pipe");
2694 ret
= session_destroy(session
);
2700 * Command LTTNG_CALIBRATE processed by the client thread.
2702 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2707 case LTTNG_DOMAIN_KERNEL
:
2709 struct lttng_kernel_calibrate kcalibrate
;
2711 kcalibrate
.type
= calibrate
->type
;
2712 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2714 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2720 /* TODO: Userspace tracing */
2721 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2732 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2734 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2740 case LTTNG_DOMAIN_KERNEL
:
2741 /* Can't register a consumer if there is already one */
2742 if (session
->kernel_session
->consumer_fd
!= 0) {
2743 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2747 sock
= lttcomm_connect_unix_sock(sock_path
);
2749 ret
= LTTCOMM_CONNECT_FAIL
;
2753 session
->kernel_session
->consumer_fd
= sock
;
2756 /* TODO: Userspace tracing */
2757 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2768 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2770 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2771 struct lttng_domain
**domains
)
2776 if (session
->kernel_session
!= NULL
) {
2777 DBG3("Listing domains found kernel domain");
2781 if (session
->ust_session
!= NULL
) {
2782 DBG3("Listing domains found UST global domain");
2786 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2787 if (*domains
== NULL
) {
2788 ret
= -LTTCOMM_FATAL
;
2792 if (session
->kernel_session
!= NULL
) {
2793 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2797 if (session
->ust_session
!= NULL
) {
2798 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2809 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2811 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2812 struct lttng_channel
**channels
)
2815 ssize_t nb_chan
= 0;
2818 case LTTNG_DOMAIN_KERNEL
:
2819 if (session
->kernel_session
!= NULL
) {
2820 nb_chan
= session
->kernel_session
->channel_count
;
2822 DBG3("Number of kernel channels %ld", nb_chan
);
2824 case LTTNG_DOMAIN_UST
:
2825 if (session
->ust_session
!= NULL
) {
2826 nb_chan
= hashtable_get_count(
2827 session
->ust_session
->domain_global
.channels
);
2829 DBG3("Number of UST global channels %ld", nb_chan
);
2833 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2838 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2839 if (*channels
== NULL
) {
2840 ret
= -LTTCOMM_FATAL
;
2844 list_lttng_channels(domain
, session
, *channels
);
2856 * Command LTTNG_LIST_EVENTS processed by the client thread.
2858 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2859 char *channel_name
, struct lttng_event
**events
)
2862 ssize_t nb_event
= 0;
2865 case LTTNG_DOMAIN_KERNEL
:
2866 if (session
->kernel_session
!= NULL
) {
2867 nb_event
= list_lttng_kernel_events(channel_name
,
2868 session
->kernel_session
, events
);
2871 case LTTNG_DOMAIN_UST
:
2873 if (session
->ust_session
!= NULL
) {
2874 nb_event
= list_lttng_ust_global_events(channel_name
,
2875 &session
->ust_session
->domain_global
, events
);
2880 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2891 * Process the command requested by the lttng client within the command
2892 * context structure. This function make sure that the return structure (llm)
2893 * is set and ready for transmission before returning.
2895 * Return any error encountered or 0 for success.
2897 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2899 int ret
= LTTCOMM_OK
;
2900 int need_tracing_session
= 1;
2902 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2905 * Check for command that don't needs to allocate a returned payload. We do
2906 * this here so we don't have to make the call for no payload at each
2909 switch(cmd_ctx
->lsm
->cmd_type
) {
2910 case LTTNG_LIST_SESSIONS
:
2911 case LTTNG_LIST_TRACEPOINTS
:
2912 case LTTNG_LIST_DOMAINS
:
2913 case LTTNG_LIST_CHANNELS
:
2914 case LTTNG_LIST_EVENTS
:
2917 /* Setup lttng message with no payload */
2918 ret
= setup_lttng_msg(cmd_ctx
, 0);
2920 /* This label does not try to unlock the session */
2921 goto init_setup_error
;
2925 /* Commands that DO NOT need a session. */
2926 switch (cmd_ctx
->lsm
->cmd_type
) {
2927 case LTTNG_CALIBRATE
:
2928 case LTTNG_CREATE_SESSION
:
2929 case LTTNG_LIST_SESSIONS
:
2930 case LTTNG_LIST_TRACEPOINTS
:
2931 need_tracing_session
= 0;
2934 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2935 session_lock_list();
2936 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2937 session_unlock_list();
2938 if (cmd_ctx
->session
== NULL
) {
2939 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
2940 ret
= LTTCOMM_SESS_NOT_FOUND
;
2942 /* If no session name specified */
2943 ret
= LTTCOMM_SELECT_SESS
;
2947 /* Acquire lock for the session */
2948 session_lock(cmd_ctx
->session
);
2954 * Check domain type for specific "pre-action".
2956 switch (cmd_ctx
->lsm
->domain
.type
) {
2957 case LTTNG_DOMAIN_KERNEL
:
2958 /* Kernel tracer check */
2959 if (kernel_tracer_fd
== 0) {
2960 /* Basically, load kernel tracer modules */
2961 init_kernel_tracer();
2962 if (kernel_tracer_fd
== 0) {
2963 ret
= LTTCOMM_KERN_NA
;
2968 /* Need a session for kernel command */
2969 if (need_tracing_session
) {
2970 if (cmd_ctx
->session
->kernel_session
== NULL
) {
2971 ret
= create_kernel_session(cmd_ctx
->session
);
2973 ret
= LTTCOMM_KERN_SESS_FAIL
;
2978 /* Start the kernel consumer daemon */
2979 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2980 if (kconsumer_data
.pid
== 0 &&
2981 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
2982 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2983 ret
= start_consumerd(&kconsumer_data
);
2985 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2989 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2992 case LTTNG_DOMAIN_UST
:
2994 if (need_tracing_session
) {
2995 if (cmd_ctx
->session
->ust_session
== NULL
) {
2996 ret
= create_ust_session(cmd_ctx
->session
,
2997 &cmd_ctx
->lsm
->domain
);
2998 if (ret
!= LTTCOMM_OK
) {
3002 /* Start the kernel consumer daemon */
3003 pthread_mutex_lock(&ustconsumer_data
.pid_mutex
);
3004 if (ustconsumer_data
.pid
== 0 &&
3005 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3006 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3007 ret
= start_consumerd(&ustconsumer_data
);
3009 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3013 cmd_ctx
->session
->ust_session
->consumer_fd
=
3014 ustconsumer_data
.cmd_sock
;
3016 pthread_mutex_unlock(&ustconsumer_data
.pid_mutex
);
3024 /* Process by command type */
3025 switch (cmd_ctx
->lsm
->cmd_type
) {
3026 case LTTNG_ADD_CONTEXT
:
3028 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3029 cmd_ctx
->lsm
->u
.context
.channel_name
,
3030 cmd_ctx
->lsm
->u
.context
.event_name
,
3031 &cmd_ctx
->lsm
->u
.context
.ctx
);
3034 case LTTNG_DISABLE_CHANNEL
:
3036 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3037 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3040 case LTTNG_DISABLE_EVENT
:
3042 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3043 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3044 cmd_ctx
->lsm
->u
.disable
.name
);
3048 case LTTNG_DISABLE_ALL_EVENT
:
3050 DBG("Disabling all events");
3052 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3053 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3056 case LTTNG_ENABLE_CHANNEL
:
3058 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3059 &cmd_ctx
->lsm
->u
.channel
.chan
);
3062 case LTTNG_ENABLE_EVENT
:
3064 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3065 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3066 &cmd_ctx
->lsm
->u
.enable
.event
);
3069 case LTTNG_ENABLE_ALL_EVENT
:
3071 DBG("Enabling all events");
3073 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3074 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3075 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3078 case LTTNG_LIST_TRACEPOINTS
:
3080 struct lttng_event
*events
;
3083 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3084 if (nb_events
< 0) {
3090 * Setup lttng message with payload size set to the event list size in
3091 * bytes and then copy list into the llm payload.
3093 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3099 /* Copy event list into message payload */
3100 memcpy(cmd_ctx
->llm
->payload
, events
,
3101 sizeof(struct lttng_event
) * nb_events
);
3108 case LTTNG_START_TRACE
:
3110 ret
= cmd_start_trace(cmd_ctx
->session
);
3113 case LTTNG_STOP_TRACE
:
3115 ret
= cmd_stop_trace(cmd_ctx
->session
);
3118 case LTTNG_CREATE_SESSION
:
3120 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3121 cmd_ctx
->lsm
->session
.path
);
3124 case LTTNG_DESTROY_SESSION
:
3126 ret
= cmd_destroy_session(cmd_ctx
->session
,
3127 cmd_ctx
->lsm
->session
.name
);
3130 case LTTNG_LIST_DOMAINS
:
3133 struct lttng_domain
*domains
;
3135 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3141 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3146 /* Copy event list into message payload */
3147 memcpy(cmd_ctx
->llm
->payload
, domains
,
3148 nb_dom
* sizeof(struct lttng_domain
));
3155 case LTTNG_LIST_CHANNELS
:
3158 struct lttng_channel
*channels
;
3160 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3161 cmd_ctx
->session
, &channels
);
3167 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3172 /* Copy event list into message payload */
3173 memcpy(cmd_ctx
->llm
->payload
, channels
,
3174 nb_chan
* sizeof(struct lttng_channel
));
3181 case LTTNG_LIST_EVENTS
:
3184 struct lttng_event
*events
= NULL
;
3186 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3187 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3193 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3198 /* Copy event list into message payload */
3199 memcpy(cmd_ctx
->llm
->payload
, events
,
3200 nb_event
* sizeof(struct lttng_event
));
3207 case LTTNG_LIST_SESSIONS
:
3209 session_lock_list();
3211 if (session_list_ptr
->count
== 0) {
3212 ret
= LTTCOMM_NO_SESSION
;
3213 session_unlock_list();
3217 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3218 session_list_ptr
->count
);
3220 session_unlock_list();
3224 /* Filled the session array */
3225 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3227 session_unlock_list();
3232 case LTTNG_CALIBRATE
:
3234 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3235 &cmd_ctx
->lsm
->u
.calibrate
);
3238 case LTTNG_REGISTER_CONSUMER
:
3240 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3241 cmd_ctx
->lsm
->u
.reg
.path
);
3250 if (cmd_ctx
->llm
== NULL
) {
3251 DBG("Missing llm structure. Allocating one.");
3252 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3256 /* Set return code */
3257 cmd_ctx
->llm
->ret_code
= ret
;
3259 if (cmd_ctx
->session
) {
3260 session_unlock(cmd_ctx
->session
);
3267 * This thread manage all clients request using the unix client socket for
3270 static void *thread_manage_clients(void *data
)
3272 int sock
= 0, ret
, i
, pollfd
;
3273 uint32_t revents
, nb_fd
;
3274 struct command_ctx
*cmd_ctx
= NULL
;
3275 struct lttng_poll_event events
;
3277 DBG("[thread] Manage client started");
3279 rcu_register_thread();
3281 ret
= lttcomm_listen_unix_sock(client_sock
);
3287 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3288 * more will be added to this poll set.
3290 ret
= create_thread_poll_set(&events
, 2);
3295 /* Add the application registration socket */
3296 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3302 * Notify parent pid that we are ready to accept command for client side.
3304 if (opt_sig_parent
) {
3305 kill(ppid
, SIGCHLD
);
3309 DBG("Accepting client command ...");
3311 nb_fd
= LTTNG_POLL_GETNB(&events
);
3313 /* Inifinite blocking call, waiting for transmission */
3314 ret
= lttng_poll_wait(&events
, -1);
3319 for (i
= 0; i
< nb_fd
; i
++) {
3320 /* Fetch once the poll data */
3321 revents
= LTTNG_POLL_GETEV(&events
, i
);
3322 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3324 /* Thread quit pipe has been closed. Killing thread. */
3325 ret
= check_thread_quit_pipe(pollfd
, revents
);
3330 /* Event on the registration socket */
3331 if (pollfd
== client_sock
) {
3332 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3333 ERR("Client socket poll error");
3339 DBG("Wait for client response");
3341 sock
= lttcomm_accept_unix_sock(client_sock
);
3346 /* Allocate context command to process the client request */
3347 cmd_ctx
= malloc(sizeof(struct command_ctx
));
3348 if (cmd_ctx
== NULL
) {
3349 perror("malloc cmd_ctx");
3353 /* Allocate data buffer for reception */
3354 cmd_ctx
->lsm
= malloc(sizeof(struct lttcomm_session_msg
));
3355 if (cmd_ctx
->lsm
== NULL
) {
3356 perror("malloc cmd_ctx->lsm");
3360 cmd_ctx
->llm
= NULL
;
3361 cmd_ctx
->session
= NULL
;
3364 * Data is received from the lttng client. The struct
3365 * lttcomm_session_msg (lsm) contains the command and data request of
3368 DBG("Receiving data from client ...");
3369 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3370 sizeof(struct lttcomm_session_msg
));
3372 DBG("Nothing recv() from client... continuing");
3378 // TODO: Validate cmd_ctx including sanity check for
3379 // security purpose.
3381 rcu_thread_online();
3383 * This function dispatch the work to the kernel or userspace tracer
3384 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3385 * informations for the client. The command context struct contains
3386 * everything this function may needs.
3388 ret
= process_client_msg(cmd_ctx
);
3389 rcu_thread_offline();
3392 * TODO: Inform client somehow of the fatal error. At
3393 * this point, ret < 0 means that a malloc failed
3394 * (ENOMEM). Error detected but still accept command.
3396 clean_command_ctx(&cmd_ctx
);
3400 DBG("Sending response (size: %d, retcode: %s)",
3401 cmd_ctx
->lttng_msg_size
,
3402 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3403 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3405 ERR("Failed to send data back to client");
3408 clean_command_ctx(&cmd_ctx
);
3410 /* End of transmission */
3415 DBG("Client thread dying");
3416 unlink(client_unix_sock_path
);
3420 lttng_poll_clean(&events
);
3421 clean_command_ctx(&cmd_ctx
);
3423 rcu_unregister_thread();
3429 * usage function on stderr
3431 static void usage(void)
3433 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3434 fprintf(stderr
, " -h, --help Display this usage.\n");
3435 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3436 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3437 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3438 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3439 fprintf(stderr
, " --ustconsumerd-err-sock PATH Specify path for the UST consumer error socket\n");
3440 fprintf(stderr
, " --ustconsumerd-cmd-sock PATH Specify path for the UST consumer command socket\n");
3441 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3442 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3443 fprintf(stderr
, " -V, --version Show version number.\n");
3444 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3445 fprintf(stderr
, " -q, --quiet No output at all.\n");
3446 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3447 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3451 * daemon argument parsing
3453 static int parse_args(int argc
, char **argv
)
3457 static struct option long_options
[] = {
3458 { "client-sock", 1, 0, 'c' },
3459 { "apps-sock", 1, 0, 'a' },
3460 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3461 { "kconsumerd-err-sock", 1, 0, 'E' },
3462 { "ustconsumerd-cmd-sock", 1, 0, 'D' },
3463 { "ustconsumerd-err-sock", 1, 0, 'F' },
3464 { "daemonize", 0, 0, 'd' },
3465 { "sig-parent", 0, 0, 'S' },
3466 { "help", 0, 0, 'h' },
3467 { "group", 1, 0, 'g' },
3468 { "version", 0, 0, 'V' },
3469 { "quiet", 0, 0, 'q' },
3470 { "verbose", 0, 0, 'v' },
3471 { "verbose-consumer", 0, 0, 'Z' },
3476 int option_index
= 0;
3477 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z",
3478 long_options
, &option_index
);
3485 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3487 fprintf(stderr
, " with arg %s\n", optarg
);
3491 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3494 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3500 opt_tracing_group
= strdup(optarg
);
3506 fprintf(stdout
, "%s\n", VERSION
);
3512 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3515 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3518 snprintf(ustconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3521 snprintf(ustconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3527 /* Verbose level can increase using multiple -v */
3531 opt_verbose_consumer
+= 1;
3534 /* Unknown option or other error.
3535 * Error is printed by getopt, just return */
3544 * Creates the two needed socket by the daemon.
3545 * apps_sock - The communication socket for all UST apps.
3546 * client_sock - The communication of the cli tool (lttng).
3548 static int init_daemon_socket(void)
3553 old_umask
= umask(0);
3555 /* Create client tool unix socket */
3556 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3557 if (client_sock
< 0) {
3558 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3563 /* File permission MUST be 660 */
3564 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3566 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3571 /* Create the application unix socket */
3572 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3573 if (apps_sock
< 0) {
3574 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3579 /* File permission MUST be 666 */
3580 ret
= chmod(apps_unix_sock_path
,
3581 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3583 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3594 * Check if the global socket is available, and if a daemon is answering at the
3595 * other side. If yes, error is returned.
3597 static int check_existing_daemon(void)
3599 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3600 access(apps_unix_sock_path
, F_OK
) < 0) {
3604 /* Is there anybody out there ? */
3605 if (lttng_session_daemon_alive()) {
3613 * Set the tracing group gid onto the client socket.
3615 * Race window between mkdir and chown is OK because we are going from more
3616 * permissive (root.root) to les permissive (root.tracing).
3618 static int set_permissions(void)
3623 gid
= allowed_group();
3626 WARN("No tracing group detected");
3629 ERR("Missing tracing group. Aborting execution.");
3635 /* Set lttng run dir */
3636 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3638 ERR("Unable to set group on " LTTNG_RUNDIR
);
3642 /* lttng client socket path */
3643 ret
= chown(client_unix_sock_path
, 0, gid
);
3645 ERR("Unable to set group on %s", client_unix_sock_path
);
3649 /* kconsumer error socket path */
3650 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3652 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3656 /* ustconsumer error socket path */
3657 ret
= chown(ustconsumer_data
.err_unix_sock_path
, 0, gid
);
3659 ERR("Unable to set group on %s", ustconsumer_data
.err_unix_sock_path
);
3663 DBG("All permissions are set");
3670 * Create the pipe used to wake up the kernel thread.
3672 static int create_kernel_poll_pipe(void)
3674 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3678 * Create the application command pipe to wake thread_manage_apps.
3680 static int create_apps_cmd_pipe(void)
3682 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3686 * Create the lttng run directory needed for all global sockets and pipe.
3688 static int create_lttng_rundir(void)
3692 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3694 if (errno
!= EEXIST
) {
3695 ERR("Unable to create " LTTNG_RUNDIR
);
3707 * Setup sockets and directory needed by the kconsumerd communication with the
3710 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3713 const char *path
= consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3714 KCONSUMERD_PATH
: USTCONSUMERD_PATH
;
3716 if (strlen(consumer_data
->err_unix_sock_path
) == 0) {
3717 snprintf(consumer_data
->err_unix_sock_path
, PATH_MAX
,
3718 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3719 KCONSUMERD_ERR_SOCK_PATH
:
3720 USTCONSUMERD_ERR_SOCK_PATH
);
3723 if (strlen(consumer_data
->cmd_unix_sock_path
) == 0) {
3724 snprintf(consumer_data
->cmd_unix_sock_path
, PATH_MAX
,
3725 consumer_data
->type
== LTTNG_CONSUMER_KERNEL
?
3726 KCONSUMERD_CMD_SOCK_PATH
:
3727 USTCONSUMERD_CMD_SOCK_PATH
);
3730 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3732 if (errno
!= EEXIST
) {
3733 ERR("Failed to create %s", path
);
3739 /* Create the kconsumerd error unix socket */
3740 consumer_data
->err_sock
=
3741 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3742 if (consumer_data
->err_sock
< 0) {
3743 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3748 /* File permission MUST be 660 */
3749 ret
= chmod(consumer_data
->err_unix_sock_path
,
3750 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3752 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3762 * Signal handler for the daemon
3764 * Simply stop all worker threads, leaving main() return gracefully after
3765 * joining all threads and calling cleanup().
3767 static void sighandler(int sig
)
3771 DBG("SIGPIPE catched");
3774 DBG("SIGINT catched");
3778 DBG("SIGTERM catched");
3787 * Setup signal handler for :
3788 * SIGINT, SIGTERM, SIGPIPE
3790 static int set_signal_handler(void)
3793 struct sigaction sa
;
3796 if ((ret
= sigemptyset(&sigset
)) < 0) {
3797 perror("sigemptyset");
3801 sa
.sa_handler
= sighandler
;
3802 sa
.sa_mask
= sigset
;
3804 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3805 perror("sigaction");
3809 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3810 perror("sigaction");
3814 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3815 perror("sigaction");
3819 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3825 * Set open files limit to unlimited. This daemon can open a large number of
3826 * file descriptors in order to consumer multiple kernel traces.
3828 static void set_ulimit(void)
3833 /* The kernel does not allowed an infinite limit for open files */
3834 lim
.rlim_cur
= 65535;
3835 lim
.rlim_max
= 65535;
3837 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3839 perror("failed to set open files limit");
3846 int main(int argc
, char **argv
)
3850 const char *home_path
;
3852 rcu_register_thread();
3854 /* Create thread quit pipe */
3855 if ((ret
= init_thread_quit_pipe()) < 0) {
3859 /* Parse arguments */
3861 if ((ret
= parse_args(argc
, argv
) < 0)) {
3874 /* Check if daemon is UID = 0 */
3875 is_root
= !getuid();
3878 ret
= create_lttng_rundir();
3883 if (strlen(apps_unix_sock_path
) == 0) {
3884 snprintf(apps_unix_sock_path
, PATH_MAX
,
3885 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
3888 if (strlen(client_unix_sock_path
) == 0) {
3889 snprintf(client_unix_sock_path
, PATH_MAX
,
3890 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
3893 /* Set global SHM for ust */
3894 if (strlen(wait_shm_path
) == 0) {
3895 snprintf(wait_shm_path
, PATH_MAX
,
3896 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
3899 home_path
= get_home_dir();
3900 if (home_path
== NULL
) {
3901 /* TODO: Add --socket PATH option */
3902 ERR("Can't get HOME directory for sockets creation.");
3907 if (strlen(apps_unix_sock_path
) == 0) {
3908 snprintf(apps_unix_sock_path
, PATH_MAX
,
3909 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
3912 /* Set the cli tool unix socket path */
3913 if (strlen(client_unix_sock_path
) == 0) {
3914 snprintf(client_unix_sock_path
, PATH_MAX
,
3915 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
3918 /* Set global SHM for ust */
3919 if (strlen(wait_shm_path
) == 0) {
3920 snprintf(wait_shm_path
, PATH_MAX
,
3921 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
3925 DBG("Client socket path %s", client_unix_sock_path
);
3926 DBG("Application socket path %s", apps_unix_sock_path
);
3929 * See if daemon already exist.
3931 if ((ret
= check_existing_daemon()) < 0) {
3932 ERR("Already running daemon.\n");
3934 * We do not goto exit because we must not cleanup()
3935 * because a daemon is already running.
3940 /* After this point, we can safely call cleanup() with "goto exit" */
3943 * These actions must be executed as root. We do that *after* setting up
3944 * the sockets path because we MUST make the check for another daemon using
3945 * those paths *before* trying to set the kernel consumer sockets and init
3949 ret
= set_consumer_sockets(&kconsumer_data
);
3954 ret
= set_consumer_sockets(&ustconsumer_data
);
3958 /* Setup kernel tracer */
3959 init_kernel_tracer();
3961 /* Set ulimit for open files */
3965 if ((ret
= set_signal_handler()) < 0) {
3969 /* Setup the needed unix socket */
3970 if ((ret
= init_daemon_socket()) < 0) {
3974 /* Set credentials to socket */
3975 if (is_root
&& ((ret
= set_permissions()) < 0)) {
3979 /* Get parent pid if -S, --sig-parent is specified. */
3980 if (opt_sig_parent
) {
3984 /* Setup the kernel pipe for waking up the kernel thread */
3985 if ((ret
= create_kernel_poll_pipe()) < 0) {
3989 /* Setup the thread apps communication pipe. */
3990 if ((ret
= create_apps_cmd_pipe()) < 0) {
3994 /* Init UST command queue. */
3995 cds_wfq_init(&ust_cmd_queue
.queue
);
3997 /* Init UST app hash table */
4001 * Get session list pointer. This pointer MUST NOT be free(). This list is
4002 * statically declared in session.c
4004 session_list_ptr
= session_get_list();
4006 /* Set up max poll set size */
4007 lttng_poll_set_max_size();
4009 /* Create thread to manage the client socket */
4010 ret
= pthread_create(&client_thread
, NULL
,
4011 thread_manage_clients
, (void *) NULL
);
4013 perror("pthread_create clients");
4017 /* Create thread to dispatch registration */
4018 ret
= pthread_create(&dispatch_thread
, NULL
,
4019 thread_dispatch_ust_registration
, (void *) NULL
);
4021 perror("pthread_create dispatch");
4025 /* Create thread to manage application registration. */
4026 ret
= pthread_create(®_apps_thread
, NULL
,
4027 thread_registration_apps
, (void *) NULL
);
4029 perror("pthread_create registration");
4033 /* Create thread to manage application socket */
4034 ret
= pthread_create(&apps_thread
, NULL
,
4035 thread_manage_apps
, (void *) NULL
);
4037 perror("pthread_create apps");
4041 /* Create kernel thread to manage kernel event */
4042 ret
= pthread_create(&kernel_thread
, NULL
,
4043 thread_manage_kernel
, (void *) NULL
);
4045 perror("pthread_create kernel");
4049 ret
= pthread_join(kernel_thread
, &status
);
4051 perror("pthread_join");
4052 goto error
; /* join error, exit without cleanup */
4056 ret
= pthread_join(apps_thread
, &status
);
4058 perror("pthread_join");
4059 goto error
; /* join error, exit without cleanup */
4063 ret
= pthread_join(reg_apps_thread
, &status
);
4065 perror("pthread_join");
4066 goto error
; /* join error, exit without cleanup */
4070 ret
= pthread_join(dispatch_thread
, &status
);
4072 perror("pthread_join");
4073 goto error
; /* join error, exit without cleanup */
4077 ret
= pthread_join(client_thread
, &status
);
4079 perror("pthread_join");
4080 goto error
; /* join error, exit without cleanup */
4083 ret
= join_consumer_thread(&kconsumer_data
);
4085 perror("join_consumer");
4086 goto error
; /* join error, exit without cleanup */
4092 * cleanup() is called when no other thread is running.
4094 rcu_thread_online();
4096 rcu_thread_offline();
4097 rcu_unregister_thread();