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
,
99 .err_unix_sock_path
= KCONSUMERD_ERR_SOCK_PATH
,
100 .cmd_unix_sock_path
= KCONSUMERD_CMD_SOCK_PATH
,
102 static struct consumer_data ustconsumer64_data
= {
103 .type
= LTTNG_CONSUMER64_UST
,
104 .err_unix_sock_path
= USTCONSUMERD64_ERR_SOCK_PATH
,
105 .cmd_unix_sock_path
= USTCONSUMERD64_CMD_SOCK_PATH
,
107 static struct consumer_data ustconsumer32_data
= {
108 .type
= LTTNG_CONSUMER32_UST
,
109 .err_unix_sock_path
= USTCONSUMERD32_ERR_SOCK_PATH
,
110 .cmd_unix_sock_path
= USTCONSUMERD32_CMD_SOCK_PATH
,
113 static int dispatch_thread_exit
;
115 /* Global application Unix socket path */
116 static char apps_unix_sock_path
[PATH_MAX
];
117 /* Global client Unix socket path */
118 static char client_unix_sock_path
[PATH_MAX
];
119 /* global wait shm path for UST */
120 static char wait_shm_path
[PATH_MAX
];
122 /* Sockets and FDs */
123 static int client_sock
;
124 static int apps_sock
;
125 static int kernel_tracer_fd
;
126 static int kernel_poll_pipe
[2];
129 * Quit pipe for all threads. This permits a single cancellation point
130 * for all threads when receiving an event on the pipe.
132 static int thread_quit_pipe
[2];
135 * This pipe is used to inform the thread managing application communication
136 * that a command is queued and ready to be processed.
138 static int apps_cmd_pipe
[2];
140 /* Pthread, Mutexes and Semaphores */
141 static pthread_t apps_thread
;
142 static pthread_t reg_apps_thread
;
143 static pthread_t client_thread
;
144 static pthread_t kernel_thread
;
145 static pthread_t dispatch_thread
;
149 * UST registration command queue. This queue is tied with a futex and uses a N
150 * wakers / 1 waiter implemented and detailed in futex.c/.h
152 * The thread_manage_apps and thread_dispatch_ust_registration interact with
153 * this queue and the wait/wake scheme.
155 static struct ust_cmd_queue ust_cmd_queue
;
158 * Pointer initialized before thread creation.
160 * This points to the tracing session list containing the session count and a
161 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
162 * MUST NOT be taken if you call a public function in session.c.
164 * The lock is nested inside the structure: session_list_ptr->lock. Please use
165 * session_lock_list and session_unlock_list for lock acquisition.
167 static struct ltt_session_list
*session_list_ptr
;
169 int ust_consumerd64_fd
= -1;
170 int ust_consumerd32_fd
= -1;
172 static const char *consumerd64_prog
= "lttng-consumerd";
173 static const char *consumerd32_prog
= "lttng-consumerd";
175 static const char *consumerd64_bindir
=
176 __stringify(CONFIG_64BIT_BINDIR
);
177 static const char *consumerd32_bindir
=
178 __stringify(CONFIG_32BIT_BINDIR
);
181 void setup_consumerd_path(void)
186 * Allow INSTALL_BIN_PATH to be used as a target path for the
187 * native architecture size consumer if CONFIG_NBIT_BINDIR as
190 #if (CAA_BITS_PER_LONG == 64)
191 if (!consumerd64_bindir
[0]) {
192 consumerd64_bindir
= INSTALL_BIN_PATH
;
194 #elif (CAA_BITS_PER_LONG == 32)
195 if (!consumerd32_bindir
[0]) {
196 consumerd32_bindir
= INSTALL_BIN_PATH
;
199 #error "Unknown bitness"
203 * runtime env. var. overrides the build default.
205 bindir
= getenv("LTTNG_TOOLS_64BIT_BINDIR");
207 consumerd64_bindir
= bindir
;
209 bindir
= getenv("LTTNG_TOOLS_32BIT_BINDIR");
211 consumerd32_bindir
= bindir
;
216 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
218 static int create_thread_poll_set(struct lttng_poll_event
*events
,
223 if (events
== NULL
|| size
== 0) {
228 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
234 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
246 * Check if the thread quit pipe was triggered.
248 * Return 1 if it was triggered else 0;
250 static int check_thread_quit_pipe(int fd
, uint32_t events
)
252 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
260 * Remove modules in reverse load order.
262 static int modprobe_remove_kernel_modules(void)
267 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
268 ret
= snprintf(modprobe
, sizeof(modprobe
),
269 "/sbin/modprobe -r -q %s",
270 kernel_modules_list
[i
].name
);
272 perror("snprintf modprobe -r");
275 modprobe
[sizeof(modprobe
) - 1] = '\0';
276 ret
= system(modprobe
);
278 ERR("Unable to launch modprobe -r for module %s",
279 kernel_modules_list
[i
].name
);
280 } else if (kernel_modules_list
[i
].required
281 && WEXITSTATUS(ret
) != 0) {
282 ERR("Unable to remove module %s",
283 kernel_modules_list
[i
].name
);
285 DBG("Modprobe removal successful %s",
286 kernel_modules_list
[i
].name
);
295 * Return group ID of the tracing group or -1 if not found.
297 static gid_t
allowed_group(void)
301 if (opt_tracing_group
) {
302 grp
= getgrnam(opt_tracing_group
);
304 grp
= getgrnam(default_tracing_group
);
314 * Init thread quit pipe.
316 * Return -1 on error or 0 if all pipes are created.
318 static int init_thread_quit_pipe(void)
322 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
324 perror("thread quit pipe");
333 * Complete teardown of a kernel session. This free all data structure related
334 * to a kernel session and update counter.
336 static void teardown_kernel_session(struct ltt_session
*session
)
338 if (!session
->kernel_session
)
340 DBG("Tearing down kernel session");
343 * If a custom kernel consumer was registered, close the socket before
344 * tearing down the complete kernel session structure
346 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
347 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
350 trace_kernel_destroy_session(session
->kernel_session
);
354 * Complete teardown of all UST sessions. This will free everything on his path
355 * and destroy the core essence of all ust sessions :)
357 static void teardown_ust_session(struct ltt_session
*session
)
361 if (!session
->ust_session
)
363 DBG("Tearing down UST session(s)");
364 ret
= ust_app_destroy_trace_all(session
->ust_session
);
366 ERR("Error in ust_app_destroy_trace_all");
368 trace_ust_destroy_session(session
->ust_session
);
372 * Stop all threads by closing the thread quit pipe.
374 static void stop_threads(void)
378 /* Stopping all threads */
379 DBG("Terminating all threads");
380 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
382 ERR("write error on thread quit pipe");
385 /* Dispatch thread */
386 dispatch_thread_exit
= 1;
387 futex_nto1_wake(&ust_cmd_queue
.futex
);
393 static void cleanup(void)
397 struct ltt_session
*sess
, *stmp
;
402 DBG("Removing %s directory", LTTNG_RUNDIR
);
403 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
405 ERR("asprintf failed. Something is really wrong!");
408 /* Remove lttng run directory */
411 ERR("Unable to clean " LTTNG_RUNDIR
);
415 DBG("Cleaning up all session");
417 /* Destroy session list mutex */
418 if (session_list_ptr
!= NULL
) {
419 pthread_mutex_destroy(&session_list_ptr
->lock
);
421 /* Cleanup ALL session */
422 cds_list_for_each_entry_safe(sess
, stmp
,
423 &session_list_ptr
->head
, list
) {
424 teardown_kernel_session(sess
);
425 teardown_ust_session(sess
);
430 DBG("Closing all UST sockets");
431 ust_app_clean_list();
433 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
435 DBG("Closing kernel fd");
436 close(kernel_tracer_fd
);
439 DBG("Unloading kernel modules");
440 modprobe_remove_kernel_modules();
443 close(thread_quit_pipe
[0]);
444 close(thread_quit_pipe
[1]);
447 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
448 "Matthew, BEET driven development works!%c[%dm",
449 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
454 * Send data on a unix socket using the liblttsessiondcomm API.
456 * Return lttcomm error code.
458 static int send_unix_sock(int sock
, void *buf
, size_t len
)
460 /* Check valid length */
465 return lttcomm_send_unix_sock(sock
, buf
, len
);
469 * Free memory of a command context structure.
471 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
473 DBG("Clean command context structure");
475 if ((*cmd_ctx
)->llm
) {
476 free((*cmd_ctx
)->llm
);
478 if ((*cmd_ctx
)->lsm
) {
479 free((*cmd_ctx
)->lsm
);
487 * Send all stream fds of kernel channel to the consumer.
489 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
490 int sock
, struct ltt_kernel_channel
*channel
)
493 struct ltt_kernel_stream
*stream
;
494 struct lttcomm_consumer_msg lkm
;
496 DBG("Sending streams of channel %s to kernel consumer",
497 channel
->channel
->name
);
500 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
501 lkm
.u
.channel
.channel_key
= channel
->fd
;
502 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
503 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
504 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
505 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
507 perror("send consumer channel");
512 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
516 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
517 lkm
.u
.stream
.channel_key
= channel
->fd
;
518 lkm
.u
.stream
.stream_key
= stream
->fd
;
519 lkm
.u
.stream
.state
= stream
->state
;
520 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
521 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
522 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
523 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
524 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
525 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
527 perror("send consumer stream");
530 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
532 perror("send consumer stream ancillary data");
537 DBG("consumer channel streams sent");
546 * Send all stream fds of the kernel session to the consumer.
548 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
549 struct ltt_kernel_session
*session
)
552 struct ltt_kernel_channel
*chan
;
553 struct lttcomm_consumer_msg lkm
;
554 int sock
= session
->consumer_fd
;
556 DBG("Sending metadata stream fd");
558 /* Extra protection. It's NOT supposed to be set to 0 at this point */
559 if (session
->consumer_fd
== 0) {
560 session
->consumer_fd
= consumer_data
->cmd_sock
;
563 if (session
->metadata_stream_fd
!= 0) {
564 /* Send metadata channel fd */
565 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
566 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
567 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
568 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
569 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
570 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
572 perror("send consumer channel");
576 /* Send metadata stream fd */
577 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
578 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
579 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
580 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
581 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
582 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
583 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
584 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
585 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
586 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
588 perror("send consumer stream");
591 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
593 perror("send consumer stream");
598 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
599 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
605 DBG("consumer fds (metadata and channel streams) sent");
614 * Notify UST applications using the shm mmap futex.
616 static int notify_ust_apps(int active
)
620 DBG("Notifying applications of session daemon state: %d", active
);
622 /* See shm.c for this call implying mmap, shm and futex calls */
623 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
624 if (wait_shm_mmap
== NULL
) {
628 /* Wake waiting process */
629 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
631 /* Apps notified successfully */
639 * Setup the outgoing data buffer for the response (llm) by allocating the
640 * right amount of memory and copying the original information from the lsm
643 * Return total size of the buffer pointed by buf.
645 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
651 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
652 if (cmd_ctx
->llm
== NULL
) {
658 /* Copy common data */
659 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
660 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
662 cmd_ctx
->llm
->data_size
= size
;
663 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
672 * Update the kernel poll set of all channel fd available over all tracing
673 * session. Add the wakeup pipe at the end of the set.
675 static int update_kernel_poll(struct lttng_poll_event
*events
)
678 struct ltt_session
*session
;
679 struct ltt_kernel_channel
*channel
;
681 DBG("Updating kernel poll set");
684 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
685 session_lock(session
);
686 if (session
->kernel_session
== NULL
) {
687 session_unlock(session
);
691 cds_list_for_each_entry(channel
,
692 &session
->kernel_session
->channel_list
.head
, list
) {
693 /* Add channel fd to the kernel poll set */
694 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
696 session_unlock(session
);
699 DBG("Channel fd %d added to kernel set", channel
->fd
);
701 session_unlock(session
);
703 session_unlock_list();
708 session_unlock_list();
713 * Find the channel fd from 'fd' over all tracing session. When found, check
714 * for new channel stream and send those stream fds to the kernel consumer.
716 * Useful for CPU hotplug feature.
718 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
721 struct ltt_session
*session
;
722 struct ltt_kernel_channel
*channel
;
724 DBG("Updating kernel streams for channel fd %d", fd
);
727 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
728 session_lock(session
);
729 if (session
->kernel_session
== NULL
) {
730 session_unlock(session
);
734 /* This is not suppose to be 0 but this is an extra security check */
735 if (session
->kernel_session
->consumer_fd
== 0) {
736 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
739 cds_list_for_each_entry(channel
,
740 &session
->kernel_session
->channel_list
.head
, list
) {
741 if (channel
->fd
== fd
) {
742 DBG("Channel found, updating kernel streams");
743 ret
= kernel_open_channel_stream(channel
);
749 * Have we already sent fds to the consumer? If yes, it means
750 * that tracing is started so it is safe to send our updated
753 if (session
->kernel_session
->consumer_fds_sent
== 1) {
754 ret
= send_kconsumer_channel_streams(consumer_data
,
755 session
->kernel_session
->consumer_fd
, channel
);
763 session_unlock(session
);
765 session_unlock_list();
769 session_unlock(session
);
770 session_unlock_list();
775 * For each tracing session, update newly registered apps.
777 static void update_ust_app(int app_sock
)
779 struct ltt_session
*sess
, *stmp
;
781 /* For all tracing session(s) */
782 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
783 if (sess
->ust_session
) {
784 ust_app_global_update(sess
->ust_session
, app_sock
);
790 * This thread manage event coming from the kernel.
792 * Features supported in this thread:
795 static void *thread_manage_kernel(void *data
)
797 int ret
, i
, pollfd
, update_poll_flag
= 1;
798 uint32_t revents
, nb_fd
;
800 struct lttng_poll_event events
;
802 DBG("Thread manage kernel started");
804 ret
= create_thread_poll_set(&events
, 2);
809 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
815 if (update_poll_flag
== 1) {
817 * Reset number of fd in the poll set. Always 2 since there is the thread
818 * quit pipe and the kernel pipe.
822 ret
= update_kernel_poll(&events
);
826 update_poll_flag
= 0;
829 nb_fd
= LTTNG_POLL_GETNB(&events
);
831 DBG("Thread kernel polling on %d fds", nb_fd
);
833 /* Zeroed the poll events */
834 lttng_poll_reset(&events
);
836 /* Poll infinite value of time */
837 ret
= lttng_poll_wait(&events
, -1);
840 } else if (ret
== 0) {
841 /* Should not happen since timeout is infinite */
842 ERR("Return value of poll is 0 with an infinite timeout.\n"
843 "This should not have happened! Continuing...");
847 for (i
= 0; i
< nb_fd
; i
++) {
848 /* Fetch once the poll data */
849 revents
= LTTNG_POLL_GETEV(&events
, i
);
850 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
852 /* Thread quit pipe has been closed. Killing thread. */
853 ret
= check_thread_quit_pipe(pollfd
, revents
);
858 /* Check for data on kernel pipe */
859 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
860 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
861 update_poll_flag
= 1;
865 * New CPU detected by the kernel. Adding kernel stream to
866 * kernel session and updating the kernel consumer
868 if (revents
& LPOLLIN
) {
869 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
875 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
876 * and unregister kernel stream at this point.
884 DBG("Kernel thread dying");
885 close(kernel_poll_pipe
[0]);
886 close(kernel_poll_pipe
[1]);
888 lttng_poll_clean(&events
);
894 * This thread manage the consumer error sent back to the session daemon.
896 static void *thread_manage_consumer(void *data
)
898 int sock
= 0, i
, ret
, pollfd
;
899 uint32_t revents
, nb_fd
;
900 enum lttcomm_return_code code
;
901 struct lttng_poll_event events
;
902 struct consumer_data
*consumer_data
= data
;
904 DBG("[thread] Manage consumer started");
906 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
912 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
913 * Nothing more will be added to this poll set.
915 ret
= create_thread_poll_set(&events
, 2);
920 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
925 nb_fd
= LTTNG_POLL_GETNB(&events
);
927 /* Inifinite blocking call, waiting for transmission */
928 ret
= lttng_poll_wait(&events
, -1);
933 for (i
= 0; i
< nb_fd
; i
++) {
934 /* Fetch once the poll data */
935 revents
= LTTNG_POLL_GETEV(&events
, i
);
936 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
938 /* Thread quit pipe has been closed. Killing thread. */
939 ret
= check_thread_quit_pipe(pollfd
, revents
);
944 /* Event on the registration socket */
945 if (pollfd
== consumer_data
->err_sock
) {
946 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
947 ERR("consumer err socket poll error");
953 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
958 DBG2("Receiving code from consumer err_sock");
960 /* Getting status code from kconsumerd */
961 ret
= lttcomm_recv_unix_sock(sock
, &code
,
962 sizeof(enum lttcomm_return_code
));
967 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
968 consumer_data
->cmd_sock
=
969 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
970 if (consumer_data
->cmd_sock
< 0) {
971 sem_post(&consumer_data
->sem
);
972 PERROR("consumer connect");
975 /* Signal condition to tell that the kconsumerd is ready */
976 sem_post(&consumer_data
->sem
);
977 DBG("consumer command socket ready");
979 ERR("consumer error when waiting for SOCK_READY : %s",
980 lttcomm_get_readable_code(-code
));
984 /* Remove the kconsumerd error sock since we've established a connexion */
985 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
990 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
995 /* Update number of fd */
996 nb_fd
= LTTNG_POLL_GETNB(&events
);
998 /* Inifinite blocking call, waiting for transmission */
999 ret
= lttng_poll_wait(&events
, -1);
1004 for (i
= 0; i
< nb_fd
; i
++) {
1005 /* Fetch once the poll data */
1006 revents
= LTTNG_POLL_GETEV(&events
, i
);
1007 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1009 /* Thread quit pipe has been closed. Killing thread. */
1010 ret
= check_thread_quit_pipe(pollfd
, revents
);
1015 /* Event on the kconsumerd socket */
1016 if (pollfd
== sock
) {
1017 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1018 ERR("consumer err socket second poll error");
1024 /* Wait for any kconsumerd error */
1025 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1026 sizeof(enum lttcomm_return_code
));
1028 ERR("consumer closed the command socket");
1032 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1035 DBG("consumer thread dying");
1036 close(consumer_data
->err_sock
);
1037 close(consumer_data
->cmd_sock
);
1040 unlink(consumer_data
->err_unix_sock_path
);
1041 unlink(consumer_data
->cmd_unix_sock_path
);
1042 consumer_data
->pid
= 0;
1044 lttng_poll_clean(&events
);
1050 * This thread manage application communication.
1052 static void *thread_manage_apps(void *data
)
1055 uint32_t revents
, nb_fd
;
1056 struct ust_command ust_cmd
;
1057 struct lttng_poll_event events
;
1059 DBG("[thread] Manage application started");
1061 rcu_register_thread();
1062 rcu_thread_online();
1064 ret
= create_thread_poll_set(&events
, 2);
1069 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1075 /* Zeroed the events structure */
1076 lttng_poll_reset(&events
);
1078 nb_fd
= LTTNG_POLL_GETNB(&events
);
1080 DBG("Apps thread polling on %d fds", nb_fd
);
1082 /* Inifinite blocking call, waiting for transmission */
1083 ret
= lttng_poll_wait(&events
, -1);
1088 for (i
= 0; i
< nb_fd
; i
++) {
1089 /* Fetch once the poll data */
1090 revents
= LTTNG_POLL_GETEV(&events
, i
);
1091 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1093 /* Thread quit pipe has been closed. Killing thread. */
1094 ret
= check_thread_quit_pipe(pollfd
, revents
);
1099 /* Inspect the apps cmd pipe */
1100 if (pollfd
== apps_cmd_pipe
[0]) {
1101 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1102 ERR("Apps command pipe error");
1104 } else if (revents
& LPOLLIN
) {
1106 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1107 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1108 perror("read apps cmd pipe");
1112 /* Register applicaton to the session daemon */
1113 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1115 if (ret
== -ENOMEM
) {
1117 } else if (ret
< 0) {
1122 * Add channel(s) and event(s) to newly registered apps
1123 * from lttng global UST domain.
1125 update_ust_app(ust_cmd
.sock
);
1127 ret
= ustctl_register_done(ust_cmd
.sock
);
1130 * If the registration is not possible, we simply
1131 * unregister the apps and continue
1133 ust_app_unregister(ust_cmd
.sock
);
1136 * We just need here to monitor the close of the UST
1137 * socket and poll set monitor those by default.
1139 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1144 DBG("Apps with sock %d added to poll set",
1152 * At this point, we know that a registered application made
1153 * the event at poll_wait.
1155 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1156 /* Removing from the poll set */
1157 ret
= lttng_poll_del(&events
, pollfd
);
1162 /* Socket closed on remote end. */
1163 ust_app_unregister(pollfd
);
1171 DBG("Application communication apps dying");
1172 close(apps_cmd_pipe
[0]);
1173 close(apps_cmd_pipe
[1]);
1175 lttng_poll_clean(&events
);
1177 rcu_thread_offline();
1178 rcu_unregister_thread();
1183 * Dispatch request from the registration threads to the application
1184 * communication thread.
1186 static void *thread_dispatch_ust_registration(void *data
)
1189 struct cds_wfq_node
*node
;
1190 struct ust_command
*ust_cmd
= NULL
;
1192 DBG("[thread] Dispatch UST command started");
1194 while (!dispatch_thread_exit
) {
1195 /* Atomically prepare the queue futex */
1196 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1199 /* Dequeue command for registration */
1200 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1202 DBG("Woken up but nothing in the UST command queue");
1203 /* Continue thread execution */
1207 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1209 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1210 " gid:%d sock:%d name:%s (version %d.%d)",
1211 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1212 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1213 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1214 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1216 * Inform apps thread of the new application registration. This
1217 * call is blocking so we can be assured that the data will be read
1218 * at some point in time or wait to the end of the world :)
1220 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1221 sizeof(struct ust_command
));
1223 perror("write apps cmd pipe");
1224 if (errno
== EBADF
) {
1226 * We can't inform the application thread to process
1227 * registration. We will exit or else application
1228 * registration will not occur and tracing will never
1235 } while (node
!= NULL
);
1237 /* Futex wait on queue. Blocking call on futex() */
1238 futex_nto1_wait(&ust_cmd_queue
.futex
);
1242 DBG("Dispatch thread dying");
1247 * This thread manage application registration.
1249 static void *thread_registration_apps(void *data
)
1251 int sock
= 0, i
, ret
, pollfd
;
1252 uint32_t revents
, nb_fd
;
1253 struct lttng_poll_event events
;
1255 * Get allocated in this thread, enqueued to a global queue, dequeued and
1256 * freed in the manage apps thread.
1258 struct ust_command
*ust_cmd
= NULL
;
1260 DBG("[thread] Manage application registration started");
1262 ret
= lttcomm_listen_unix_sock(apps_sock
);
1268 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1269 * more will be added to this poll set.
1271 ret
= create_thread_poll_set(&events
, 2);
1276 /* Add the application registration socket */
1277 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1282 /* Notify all applications to register */
1283 ret
= notify_ust_apps(1);
1285 ERR("Failed to notify applications or create the wait shared memory.\n"
1286 "Execution continues but there might be problem for already\n"
1287 "running applications that wishes to register.");
1291 DBG("Accepting application registration");
1293 nb_fd
= LTTNG_POLL_GETNB(&events
);
1295 /* Inifinite blocking call, waiting for transmission */
1296 ret
= lttng_poll_wait(&events
, -1);
1301 for (i
= 0; i
< nb_fd
; i
++) {
1302 /* Fetch once the poll data */
1303 revents
= LTTNG_POLL_GETEV(&events
, i
);
1304 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1306 /* Thread quit pipe has been closed. Killing thread. */
1307 ret
= check_thread_quit_pipe(pollfd
, revents
);
1312 /* Event on the registration socket */
1313 if (pollfd
== apps_sock
) {
1314 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1315 ERR("Register apps socket poll error");
1317 } else if (revents
& LPOLLIN
) {
1318 sock
= lttcomm_accept_unix_sock(apps_sock
);
1323 /* Create UST registration command for enqueuing */
1324 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1325 if (ust_cmd
== NULL
) {
1326 perror("ust command zmalloc");
1331 * Using message-based transmissions to ensure we don't
1332 * have to deal with partially received messages.
1334 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1335 sizeof(struct ust_register_msg
));
1336 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1338 perror("lttcomm_recv_unix_sock register apps");
1340 ERR("Wrong size received on apps register");
1347 ust_cmd
->sock
= sock
;
1349 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1350 " gid:%d sock:%d name:%s (version %d.%d)",
1351 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1352 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1353 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1354 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1357 * Lock free enqueue the registration request. The red pill
1358 * has been taken! This apps will be part of the *system*.
1360 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1363 * Wake the registration queue futex. Implicit memory
1364 * barrier with the exchange in cds_wfq_enqueue.
1366 futex_nto1_wake(&ust_cmd_queue
.futex
);
1373 DBG("UST Registration thread dying");
1375 /* Notify that the registration thread is gone */
1380 unlink(apps_unix_sock_path
);
1382 lttng_poll_clean(&events
);
1388 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1389 * exec or it will fails.
1391 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1394 struct timespec timeout
;
1396 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1397 timeout
.tv_nsec
= 0;
1399 /* Setup semaphore */
1400 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1402 PERROR("sem_init consumer semaphore");
1406 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1407 thread_manage_consumer
, consumer_data
);
1409 PERROR("pthread_create consumer");
1414 /* Get time for sem_timedwait absolute timeout */
1415 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1417 PERROR("clock_gettime spawn consumer");
1418 /* Infinite wait for the kconsumerd thread to be ready */
1419 ret
= sem_wait(&consumer_data
->sem
);
1421 /* Normal timeout if the gettime was successful */
1422 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1423 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1427 if (errno
== ETIMEDOUT
) {
1429 * Call has timed out so we kill the kconsumerd_thread and return
1432 ERR("The consumer thread was never ready. Killing it");
1433 ret
= pthread_cancel(consumer_data
->thread
);
1435 PERROR("pthread_cancel consumer thread");
1438 PERROR("semaphore wait failed consumer thread");
1443 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1444 if (consumer_data
->pid
== 0) {
1445 ERR("Kconsumerd did not start");
1446 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1449 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1458 * Join consumer thread
1460 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1465 if (consumer_data
->pid
!= 0) {
1466 ret
= kill(consumer_data
->pid
, SIGTERM
);
1468 ERR("Error killing consumer daemon");
1471 return pthread_join(consumer_data
->thread
, &status
);
1478 * Fork and exec a consumer daemon (consumerd).
1480 * Return pid if successful else -1.
1482 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1486 const char *verbosity
;
1488 DBG("Spawning consumerd");
1495 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1496 verbosity
= "--verbose";
1498 verbosity
= "--quiet";
1500 switch (consumer_data
->type
) {
1501 case LTTNG_CONSUMER_KERNEL
:
1502 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1503 "lttng-consumerd", verbosity
, "-k",
1504 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1505 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1508 case LTTNG_CONSUMER64_UST
:
1510 char path
[PATH_MAX
];
1512 snprintf(path
, PATH_MAX
, "%s/%s",
1513 consumerd64_bindir
, consumerd64_prog
);
1514 execl(path
, verbosity
, "-u",
1515 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1516 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1520 case LTTNG_CONSUMER32_UST
:
1522 char path
[PATH_MAX
];
1524 snprintf(path
, PATH_MAX
, "%s/%s",
1525 consumerd32_bindir
, consumerd32_prog
);
1526 execl(path
, verbosity
, "-u",
1527 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1528 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1533 perror("unknown consumer type");
1537 perror("kernel start consumer exec");
1540 } else if (pid
> 0) {
1543 perror("start consumer fork");
1550 * Spawn the consumerd daemon and session daemon thread.
1552 static int start_consumerd(struct consumer_data
*consumer_data
)
1556 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1557 if (consumer_data
->pid
!= 0) {
1558 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1562 ret
= spawn_consumerd(consumer_data
);
1564 ERR("Spawning consumerd failed");
1565 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1569 /* Setting up the consumer_data pid */
1570 consumer_data
->pid
= ret
;
1571 DBG2("Consumer pid %d", consumer_data
->pid
);
1572 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1574 DBG2("Spawning consumer control thread");
1575 ret
= spawn_consumer_thread(consumer_data
);
1577 ERR("Fatal error spawning consumer control thread");
1589 * modprobe_kernel_modules
1591 static int modprobe_kernel_modules(void)
1596 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1597 ret
= snprintf(modprobe
, sizeof(modprobe
),
1598 "/sbin/modprobe %s%s",
1599 kernel_modules_list
[i
].required
? "" : "-q ",
1600 kernel_modules_list
[i
].name
);
1602 perror("snprintf modprobe");
1605 modprobe
[sizeof(modprobe
) - 1] = '\0';
1606 ret
= system(modprobe
);
1608 ERR("Unable to launch modprobe for module %s",
1609 kernel_modules_list
[i
].name
);
1610 } else if (kernel_modules_list
[i
].required
1611 && WEXITSTATUS(ret
) != 0) {
1612 ERR("Unable to load module %s",
1613 kernel_modules_list
[i
].name
);
1615 DBG("Modprobe successfully %s",
1616 kernel_modules_list
[i
].name
);
1627 static int mount_debugfs(char *path
)
1630 char *type
= "debugfs";
1632 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1634 PERROR("Cannot create debugfs path");
1638 ret
= mount(type
, path
, type
, 0, NULL
);
1640 PERROR("Cannot mount debugfs");
1644 DBG("Mounted debugfs successfully at %s", path
);
1651 * Setup necessary data for kernel tracer action.
1653 static void init_kernel_tracer(void)
1656 char *proc_mounts
= "/proc/mounts";
1658 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1661 /* Detect debugfs */
1662 fp
= fopen(proc_mounts
, "r");
1664 ERR("Unable to probe %s", proc_mounts
);
1668 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1669 if (strstr(line
, "debugfs") != NULL
) {
1670 /* Remove first string */
1672 /* Dup string here so we can reuse line later on */
1673 debugfs_path
= strdup(strtok(NULL
, " "));
1674 DBG("Got debugfs path : %s", debugfs_path
);
1681 /* Mount debugfs if needded */
1682 if (debugfs_path
== NULL
) {
1683 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1685 perror("asprintf debugfs path");
1688 ret
= mount_debugfs(debugfs_path
);
1690 perror("Cannot mount debugfs");
1695 /* Modprobe lttng kernel modules */
1696 ret
= modprobe_kernel_modules();
1701 /* Setup lttng kernel path */
1702 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1704 perror("asprintf lttng path");
1708 /* Open debugfs lttng */
1709 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1710 if (kernel_tracer_fd
< 0) {
1711 DBG("Failed to open %s", lttng_path
);
1717 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1727 WARN("No kernel tracer available");
1728 kernel_tracer_fd
= 0;
1733 * Init tracing by creating trace directory and sending fds kernel consumer.
1735 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1739 if (session
->consumer_fds_sent
== 0) {
1741 * Assign default kernel consumer socket if no consumer assigned to the
1742 * kernel session. At this point, it's NOT suppose to be 0 but this is
1743 * an extra security check.
1745 if (session
->consumer_fd
== 0) {
1746 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1749 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1751 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1755 session
->consumer_fds_sent
= 1;
1763 * Create an UST session and add it to the session ust list.
1765 static int create_ust_session(struct ltt_session
*session
,
1766 struct lttng_domain
*domain
)
1770 struct ltt_ust_session
*lus
= NULL
;
1772 switch (domain
->type
) {
1773 case LTTNG_DOMAIN_UST
:
1776 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1780 DBG("Creating UST session");
1783 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1785 ret
= LTTCOMM_UST_SESS_FAIL
;
1789 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1790 geteuid(), allowed_group());
1792 if (ret
!= -EEXIST
) {
1793 ERR("Trace directory creation error");
1794 ret
= LTTCOMM_UST_SESS_FAIL
;
1799 /* The domain type dictate different actions on session creation */
1800 switch (domain
->type
) {
1801 case LTTNG_DOMAIN_UST
:
1802 /* No ustctl for the global UST domain */
1805 ERR("Unknown UST domain on create session %d", domain
->type
);
1808 session
->ust_session
= lus
;
1818 * Create a kernel tracer session then create the default channel.
1820 static int create_kernel_session(struct ltt_session
*session
)
1824 DBG("Creating kernel session");
1826 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1828 ret
= LTTCOMM_KERN_SESS_FAIL
;
1832 /* Set kernel consumer socket fd */
1833 if (kconsumer_data
.cmd_sock
) {
1834 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1837 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1838 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1840 if (ret
!= -EEXIST
) {
1841 ERR("Trace directory creation error");
1851 * Using the session list, filled a lttng_session array to send back to the
1852 * client for session listing.
1854 * The session list lock MUST be acquired before calling this function. Use
1855 * session_lock_list() and session_unlock_list().
1857 static void list_lttng_sessions(struct lttng_session
*sessions
)
1860 struct ltt_session
*session
;
1862 DBG("Getting all available session");
1864 * Iterate over session list and append data after the control struct in
1867 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1868 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1869 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1870 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1871 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1872 sessions
[i
].enabled
= session
->enabled
;
1878 * Fill lttng_channel array of all channels.
1880 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1881 struct lttng_channel
*channels
)
1884 struct ltt_kernel_channel
*kchan
;
1886 DBG("Listing channels for session %s", session
->name
);
1889 case LTTNG_DOMAIN_KERNEL
:
1890 /* Kernel channels */
1891 if (session
->kernel_session
!= NULL
) {
1892 cds_list_for_each_entry(kchan
,
1893 &session
->kernel_session
->channel_list
.head
, list
) {
1894 /* Copy lttng_channel struct to array */
1895 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1896 channels
[i
].enabled
= kchan
->enabled
;
1901 case LTTNG_DOMAIN_UST
:
1903 struct cds_lfht_iter iter
;
1904 struct ltt_ust_channel
*uchan
;
1906 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1907 &iter
, uchan
, node
) {
1908 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1909 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1910 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1911 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1912 channels
[i
].attr
.switch_timer_interval
=
1913 uchan
->attr
.switch_timer_interval
;
1914 channels
[i
].attr
.read_timer_interval
=
1915 uchan
->attr
.read_timer_interval
;
1916 channels
[i
].attr
.output
= uchan
->attr
.output
;
1927 * Create a list of ust global domain events.
1929 static int list_lttng_ust_global_events(char *channel_name
,
1930 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1933 unsigned int nb_event
= 0;
1934 struct cds_lfht_iter iter
;
1935 struct ltt_ust_channel
*uchan
;
1936 struct ltt_ust_event
*uevent
;
1937 struct lttng_event
*tmp
;
1939 DBG("Listing UST global events for channel %s", channel_name
);
1943 /* Count events in all channels */
1944 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1945 nb_event
+= hashtable_get_count(uchan
->events
);
1948 if (nb_event
== 0) {
1953 DBG3("Listing UST global %d events", nb_event
);
1955 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1957 ret
= -LTTCOMM_FATAL
;
1961 cds_lfht_for_each_entry(ust_global
->channels
, &iter
, uchan
, node
) {
1962 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
1963 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
1964 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1965 tmp
[i
].enabled
= uevent
->enabled
;
1966 switch (uevent
->attr
.instrumentation
) {
1967 case LTTNG_UST_TRACEPOINT
:
1968 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1970 case LTTNG_UST_PROBE
:
1971 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
1973 case LTTNG_UST_FUNCTION
:
1974 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
1990 * Fill lttng_event array of all kernel events in the channel.
1992 static int list_lttng_kernel_events(char *channel_name
,
1993 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
1996 unsigned int nb_event
;
1997 struct ltt_kernel_event
*event
;
1998 struct ltt_kernel_channel
*kchan
;
2000 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2001 if (kchan
== NULL
) {
2002 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2006 nb_event
= kchan
->event_count
;
2008 DBG("Listing events for channel %s", kchan
->channel
->name
);
2010 if (nb_event
== 0) {
2015 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2016 if (*events
== NULL
) {
2017 ret
= LTTCOMM_FATAL
;
2021 /* Kernel channels */
2022 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2023 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2024 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2025 (*events
)[i
].enabled
= event
->enabled
;
2026 switch (event
->event
->instrumentation
) {
2027 case LTTNG_KERNEL_TRACEPOINT
:
2028 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2030 case LTTNG_KERNEL_KPROBE
:
2031 case LTTNG_KERNEL_KRETPROBE
:
2032 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2033 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2034 sizeof(struct lttng_kernel_kprobe
));
2036 case LTTNG_KERNEL_FUNCTION
:
2037 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2038 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2039 sizeof(struct lttng_kernel_function
));
2041 case LTTNG_KERNEL_NOOP
:
2042 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2044 case LTTNG_KERNEL_SYSCALL
:
2045 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2047 case LTTNG_KERNEL_ALL
:
2061 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2063 static int cmd_disable_channel(struct ltt_session
*session
,
2064 int domain
, char *channel_name
)
2069 case LTTNG_DOMAIN_KERNEL
:
2070 ret
= channel_kernel_disable(session
->kernel_session
,
2072 if (ret
!= LTTCOMM_OK
) {
2076 kernel_wait_quiescent(kernel_tracer_fd
);
2078 case LTTNG_DOMAIN_UST_PID
:
2081 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2092 * Copy channel from attributes and set it in the application channel list.
2095 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2096 struct lttng_channel *attr, struct ust_app *app)
2099 struct ltt_ust_channel *uchan, *new_chan;
2101 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2102 if (uchan == NULL) {
2103 ret = LTTCOMM_FATAL;
2107 new_chan = trace_ust_create_channel(attr, usess->path);
2108 if (new_chan == NULL) {
2109 PERROR("malloc ltt_ust_channel");
2110 ret = LTTCOMM_FATAL;
2114 ret = channel_ust_copy(new_chan, uchan);
2116 ret = LTTCOMM_FATAL;
2126 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2128 static int cmd_enable_channel(struct ltt_session
*session
,
2129 struct lttng_domain
*domain
, struct lttng_channel
*attr
)
2132 struct ltt_ust_session
*usess
= session
->ust_session
;
2134 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2136 switch (domain
->type
) {
2137 case LTTNG_DOMAIN_KERNEL
:
2139 struct ltt_kernel_channel
*kchan
;
2141 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2142 session
->kernel_session
);
2143 if (kchan
== NULL
) {
2144 ret
= channel_kernel_create(session
->kernel_session
,
2145 attr
, kernel_poll_pipe
[1]);
2147 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2150 if (ret
!= LTTCOMM_OK
) {
2154 kernel_wait_quiescent(kernel_tracer_fd
);
2157 case LTTNG_DOMAIN_UST
:
2159 struct ltt_ust_channel
*uchan
;
2161 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2163 /* Get channel in global UST domain HT */
2164 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2166 if (uchan
== NULL
) {
2167 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2168 if (uchan
== NULL
) {
2169 ret
= LTTCOMM_UST_CHAN_FAIL
;
2174 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2176 DBG2("UST channel %s added to global domain HT", attr
->name
);
2178 ret
= LTTCOMM_UST_CHAN_EXIST
;
2182 /* Add channel to all registered applications */
2183 ret
= ust_app_create_channel_all(usess
, uchan
);
2192 case LTTNG_DOMAIN_UST_PID
:
2196 struct ltt_ust_channel *uchan;
2197 struct ltt_ust_session *usess;
2198 struct ust_app *app;
2200 usess = trace_ust_get_session_by_pid(&session->ust_session_list,
2202 if (usess == NULL) {
2203 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2207 app = ust_app_get_by_pid(domain->attr.pid);
2209 ret = LTTCOMM_APP_NOT_FOUND;
2214 uchan = trace_ust_get_channel_by_name(attr->name, usess);
2215 if (uchan == NULL) {
2216 ret = channel_ust_create(usess, attr, sock);
2218 ret = channel_ust_enable(usess, uchan, sock);
2221 if (ret != LTTCOMM_OK) {
2225 ret = copy_ust_channel_to_app(usess, attr, app);
2226 if (ret != LTTCOMM_OK) {
2230 DBG("UST channel %s created for app sock %d with pid %d",
2231 attr->name, app->sock, domain->attr.pid);
2233 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2237 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2248 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2250 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2251 char *channel_name
, char *event_name
)
2256 case LTTNG_DOMAIN_KERNEL
:
2258 struct ltt_kernel_channel
*kchan
;
2260 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2261 session
->kernel_session
);
2262 if (kchan
== NULL
) {
2263 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2267 ret
= event_kernel_disable_tracepoint(session
->kernel_session
, kchan
, event_name
);
2268 if (ret
!= LTTCOMM_OK
) {
2272 kernel_wait_quiescent(kernel_tracer_fd
);
2275 case LTTNG_DOMAIN_UST
:
2276 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2277 case LTTNG_DOMAIN_UST_PID
:
2278 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2280 /* TODO: Other UST domains */
2281 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2292 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2294 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2298 struct ltt_kernel_channel
*kchan
;
2301 case LTTNG_DOMAIN_KERNEL
:
2302 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2303 session
->kernel_session
);
2304 if (kchan
== NULL
) {
2305 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2309 ret
= event_kernel_disable_all(session
->kernel_session
, kchan
);
2310 if (ret
!= LTTCOMM_OK
) {
2314 kernel_wait_quiescent(kernel_tracer_fd
);
2317 /* TODO: Userspace tracing */
2318 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2329 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2331 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2332 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2337 case LTTNG_DOMAIN_KERNEL
:
2338 /* Add kernel context to kernel tracer */
2339 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2340 event_name
, channel_name
);
2341 if (ret
!= LTTCOMM_OK
) {
2345 case LTTNG_DOMAIN_UST
:
2348 struct ltt_ust_session *usess;
2350 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2351 ret = context_ust_add(usess, ctx,
2352 event_name, channel_name, domain);
2353 if (ret != LTTCOMM_OK) {
2361 /* TODO: UST other domains */
2362 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2373 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2375 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2376 char *channel_name
, struct lttng_event
*event
)
2379 struct lttng_channel
*attr
;
2380 struct ltt_ust_session
*usess
= session
->ust_session
;
2383 case LTTNG_DOMAIN_KERNEL
:
2385 struct ltt_kernel_channel
*kchan
;
2387 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2388 session
->kernel_session
);
2389 if (kchan
== NULL
) {
2390 attr
= channel_new_default_attr(domain
);
2392 ret
= LTTCOMM_FATAL
;
2395 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2397 /* This call will notify the kernel thread */
2398 ret
= channel_kernel_create(session
->kernel_session
,
2399 attr
, kernel_poll_pipe
[1]);
2400 if (ret
!= LTTCOMM_OK
) {
2405 /* Get the newly created kernel channel pointer */
2406 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2407 session
->kernel_session
);
2408 if (kchan
== NULL
) {
2409 /* This sould not happen... */
2410 ret
= LTTCOMM_FATAL
;
2414 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2416 if (ret
!= LTTCOMM_OK
) {
2420 kernel_wait_quiescent(kernel_tracer_fd
);
2423 case LTTNG_DOMAIN_UST
:
2425 struct ltt_ust_channel
*uchan
;
2426 struct ltt_ust_event
*uevent
;
2428 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2430 if (uchan
== NULL
) {
2431 /* TODO: Create default channel */
2432 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2436 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2437 if (uevent
== NULL
) {
2438 uevent
= trace_ust_create_event(event
);
2439 if (uevent
== NULL
) {
2440 ret
= LTTCOMM_FATAL
;
2446 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2448 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2452 /* Add ltt ust event to channel */
2454 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2457 uevent
->enabled
= 1;
2459 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
2463 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2464 case LTTNG_DOMAIN_UST_PID
:
2465 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2467 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2478 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2480 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2481 char *channel_name
, int event_type
)
2484 struct ltt_kernel_channel
*kchan
;
2487 case LTTNG_DOMAIN_KERNEL
:
2488 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2489 session
->kernel_session
);
2490 if (kchan
== NULL
) {
2491 /* This call will notify the kernel thread */
2492 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2493 kernel_poll_pipe
[1]);
2494 if (ret
!= LTTCOMM_OK
) {
2499 /* Get the newly created kernel channel pointer */
2500 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2501 session
->kernel_session
);
2502 if (kchan
== NULL
) {
2503 /* This sould not happen... */
2504 ret
= LTTCOMM_FATAL
;
2508 switch (event_type
) {
2509 case LTTNG_KERNEL_SYSCALL
:
2510 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2511 kchan
, kernel_tracer_fd
);
2513 case LTTNG_KERNEL_TRACEPOINT
:
2515 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2516 * events already registered to the channel.
2518 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2519 kchan
, kernel_tracer_fd
);
2521 case LTTNG_KERNEL_ALL
:
2522 /* Enable syscalls and tracepoints */
2523 ret
= event_kernel_enable_all(session
->kernel_session
,
2524 kchan
, kernel_tracer_fd
);
2527 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2530 if (ret
!= LTTCOMM_OK
) {
2534 kernel_wait_quiescent(kernel_tracer_fd
);
2537 /* TODO: Userspace tracing */
2538 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2549 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2551 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2554 ssize_t nb_events
= 0;
2557 case LTTNG_DOMAIN_KERNEL
:
2558 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2559 if (nb_events
< 0) {
2560 ret
= LTTCOMM_KERN_LIST_FAIL
;
2564 case LTTNG_DOMAIN_UST
:
2565 nb_events
= ust_app_list_events(events
);
2566 if (nb_events
< 0) {
2567 ret
= LTTCOMM_UST_LIST_FAIL
;
2572 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2579 /* Return negative value to differentiate return code */
2584 * Command LTTNG_START_TRACE processed by the client thread.
2586 static int cmd_start_trace(struct ltt_session
*session
)
2589 struct ltt_kernel_session
*ksession
;
2590 struct ltt_ust_session
*usess
;
2593 ksession
= session
->kernel_session
;
2594 usess
= session
->ust_session
;
2596 if (session
->enabled
)
2597 return LTTCOMM_UST_START_FAIL
;
2598 session
->enabled
= 1;
2600 /* Kernel tracing */
2601 if (ksession
!= NULL
) {
2602 struct ltt_kernel_channel
*kchan
;
2604 /* Open kernel metadata */
2605 if (ksession
->metadata
== NULL
) {
2606 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2608 ret
= LTTCOMM_KERN_META_FAIL
;
2613 /* Open kernel metadata stream */
2614 if (ksession
->metadata_stream_fd
== 0) {
2615 ret
= kernel_open_metadata_stream(ksession
);
2617 ERR("Kernel create metadata stream failed");
2618 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2623 /* For each channel */
2624 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2625 if (kchan
->stream_count
== 0) {
2626 ret
= kernel_open_channel_stream(kchan
);
2628 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2631 /* Update the stream global counter */
2632 ksession
->stream_count_global
+= ret
;
2636 /* Setup kernel consumer socket and send fds to it */
2637 ret
= init_kernel_tracing(ksession
);
2639 ret
= LTTCOMM_KERN_START_FAIL
;
2643 /* This start the kernel tracing */
2644 ret
= kernel_start_session(ksession
);
2646 ret
= LTTCOMM_KERN_START_FAIL
;
2650 /* Quiescent wait after starting trace */
2651 kernel_wait_quiescent(kernel_tracer_fd
);
2654 /* Flag session that trace should start automatically */
2656 usess
->start_trace
= 1;
2658 ret
= ust_app_start_trace_all(usess
);
2660 ret
= LTTCOMM_UST_START_FAIL
;
2672 * Command LTTNG_STOP_TRACE processed by the client thread.
2674 static int cmd_stop_trace(struct ltt_session
*session
)
2677 struct ltt_kernel_channel
*kchan
;
2678 struct ltt_kernel_session
*ksession
;
2679 struct ltt_ust_session
*usess
;
2682 ksession
= session
->kernel_session
;
2683 usess
= session
->ust_session
;
2685 if (!session
->enabled
)
2686 return LTTCOMM_UST_START_FAIL
;
2687 session
->enabled
= 0;
2690 if (ksession
!= NULL
) {
2691 DBG("Stop kernel tracing");
2693 /* Flush all buffers before stopping */
2694 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2696 ERR("Kernel metadata flush failed");
2699 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2700 ret
= kernel_flush_buffer(kchan
);
2702 ERR("Kernel flush buffer error");
2706 ret
= kernel_stop_session(ksession
);
2708 ret
= LTTCOMM_KERN_STOP_FAIL
;
2712 kernel_wait_quiescent(kernel_tracer_fd
);
2715 /* Flag session that trace should start automatically */
2717 usess
->start_trace
= 0;
2719 ret
= ust_app_stop_trace_all(usess
);
2721 ret
= LTTCOMM_UST_START_FAIL
;
2733 * Command LTTNG_CREATE_SESSION processed by the client thread.
2735 static int cmd_create_session(char *name
, char *path
)
2739 ret
= session_create(name
, path
);
2740 if (ret
!= LTTCOMM_OK
) {
2751 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2753 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2757 /* Clean kernel session teardown */
2758 teardown_kernel_session(session
);
2759 /* UST session teardown */
2760 teardown_ust_session(session
);
2763 * Must notify the kernel thread here to update it's poll setin order
2764 * to remove the channel(s)' fd just destroyed.
2766 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2768 perror("write kernel poll pipe");
2771 ret
= session_destroy(session
);
2777 * Command LTTNG_CALIBRATE processed by the client thread.
2779 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2784 case LTTNG_DOMAIN_KERNEL
:
2786 struct lttng_kernel_calibrate kcalibrate
;
2788 kcalibrate
.type
= calibrate
->type
;
2789 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2791 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2797 /* TODO: Userspace tracing */
2798 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2809 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2811 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2817 case LTTNG_DOMAIN_KERNEL
:
2818 /* Can't register a consumer if there is already one */
2819 if (session
->kernel_session
->consumer_fd
!= 0) {
2820 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2824 sock
= lttcomm_connect_unix_sock(sock_path
);
2826 ret
= LTTCOMM_CONNECT_FAIL
;
2830 session
->kernel_session
->consumer_fd
= sock
;
2833 /* TODO: Userspace tracing */
2834 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2845 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2847 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2848 struct lttng_domain
**domains
)
2853 if (session
->kernel_session
!= NULL
) {
2854 DBG3("Listing domains found kernel domain");
2858 if (session
->ust_session
!= NULL
) {
2859 DBG3("Listing domains found UST global domain");
2863 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2864 if (*domains
== NULL
) {
2865 ret
= -LTTCOMM_FATAL
;
2869 if (session
->kernel_session
!= NULL
) {
2870 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2874 if (session
->ust_session
!= NULL
) {
2875 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2886 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2888 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2889 struct lttng_channel
**channels
)
2892 ssize_t nb_chan
= 0;
2895 case LTTNG_DOMAIN_KERNEL
:
2896 if (session
->kernel_session
!= NULL
) {
2897 nb_chan
= session
->kernel_session
->channel_count
;
2899 DBG3("Number of kernel channels %zd", nb_chan
);
2901 case LTTNG_DOMAIN_UST
:
2902 if (session
->ust_session
!= NULL
) {
2903 nb_chan
= hashtable_get_count(
2904 session
->ust_session
->domain_global
.channels
);
2906 DBG3("Number of UST global channels %zd", nb_chan
);
2910 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2915 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
2916 if (*channels
== NULL
) {
2917 ret
= -LTTCOMM_FATAL
;
2921 list_lttng_channels(domain
, session
, *channels
);
2933 * Command LTTNG_LIST_EVENTS processed by the client thread.
2935 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
2936 char *channel_name
, struct lttng_event
**events
)
2939 ssize_t nb_event
= 0;
2942 case LTTNG_DOMAIN_KERNEL
:
2943 if (session
->kernel_session
!= NULL
) {
2944 nb_event
= list_lttng_kernel_events(channel_name
,
2945 session
->kernel_session
, events
);
2948 case LTTNG_DOMAIN_UST
:
2950 if (session
->ust_session
!= NULL
) {
2951 nb_event
= list_lttng_ust_global_events(channel_name
,
2952 &session
->ust_session
->domain_global
, events
);
2957 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
2968 * Process the command requested by the lttng client within the command
2969 * context structure. This function make sure that the return structure (llm)
2970 * is set and ready for transmission before returning.
2972 * Return any error encountered or 0 for success.
2974 static int process_client_msg(struct command_ctx
*cmd_ctx
)
2976 int ret
= LTTCOMM_OK
;
2977 int need_tracing_session
= 1;
2979 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2982 * Check for command that don't needs to allocate a returned payload. We do
2983 * this here so we don't have to make the call for no payload at each
2986 switch(cmd_ctx
->lsm
->cmd_type
) {
2987 case LTTNG_LIST_SESSIONS
:
2988 case LTTNG_LIST_TRACEPOINTS
:
2989 case LTTNG_LIST_DOMAINS
:
2990 case LTTNG_LIST_CHANNELS
:
2991 case LTTNG_LIST_EVENTS
:
2994 /* Setup lttng message with no payload */
2995 ret
= setup_lttng_msg(cmd_ctx
, 0);
2997 /* This label does not try to unlock the session */
2998 goto init_setup_error
;
3002 /* Commands that DO NOT need a session. */
3003 switch (cmd_ctx
->lsm
->cmd_type
) {
3004 case LTTNG_CALIBRATE
:
3005 case LTTNG_CREATE_SESSION
:
3006 case LTTNG_LIST_SESSIONS
:
3007 case LTTNG_LIST_TRACEPOINTS
:
3008 need_tracing_session
= 0;
3011 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3012 session_lock_list();
3013 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3014 session_unlock_list();
3015 if (cmd_ctx
->session
== NULL
) {
3016 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3017 ret
= LTTCOMM_SESS_NOT_FOUND
;
3019 /* If no session name specified */
3020 ret
= LTTCOMM_SELECT_SESS
;
3024 /* Acquire lock for the session */
3025 session_lock(cmd_ctx
->session
);
3031 * Check domain type for specific "pre-action".
3033 switch (cmd_ctx
->lsm
->domain
.type
) {
3034 case LTTNG_DOMAIN_KERNEL
:
3035 /* Kernel tracer check */
3036 if (kernel_tracer_fd
== 0) {
3037 /* Basically, load kernel tracer modules */
3038 init_kernel_tracer();
3039 if (kernel_tracer_fd
== 0) {
3040 ret
= LTTCOMM_KERN_NA
;
3045 /* Need a session for kernel command */
3046 if (need_tracing_session
) {
3047 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3048 ret
= create_kernel_session(cmd_ctx
->session
);
3050 ret
= LTTCOMM_KERN_SESS_FAIL
;
3055 /* Start the kernel consumer daemon */
3056 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3057 if (kconsumer_data
.pid
== 0 &&
3058 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3059 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3060 ret
= start_consumerd(&kconsumer_data
);
3062 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3066 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3070 case LTTNG_DOMAIN_UST
:
3072 if (need_tracing_session
) {
3073 if (cmd_ctx
->session
->ust_session
== NULL
) {
3074 ret
= create_ust_session(cmd_ctx
->session
,
3075 &cmd_ctx
->lsm
->domain
);
3076 if (ret
!= LTTCOMM_OK
) {
3080 /* Start the UST consumer daemons */
3082 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3083 if (consumerd64_bindir
[0] != '\0' &&
3084 ustconsumer64_data
.pid
== 0 &&
3085 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3086 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3087 ret
= start_consumerd(&ustconsumer64_data
);
3089 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3090 ust_consumerd64_fd
= -EINVAL
;
3094 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3096 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3099 if (consumerd32_bindir
[0] != '\0' &&
3100 ustconsumer32_data
.pid
== 0 &&
3101 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3102 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3103 ret
= start_consumerd(&ustconsumer32_data
);
3105 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3106 ust_consumerd32_fd
= -EINVAL
;
3109 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3111 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3120 /* Process by command type */
3121 switch (cmd_ctx
->lsm
->cmd_type
) {
3122 case LTTNG_ADD_CONTEXT
:
3124 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3125 cmd_ctx
->lsm
->u
.context
.channel_name
,
3126 cmd_ctx
->lsm
->u
.context
.event_name
,
3127 &cmd_ctx
->lsm
->u
.context
.ctx
);
3130 case LTTNG_DISABLE_CHANNEL
:
3132 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3133 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3136 case LTTNG_DISABLE_EVENT
:
3138 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3139 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3140 cmd_ctx
->lsm
->u
.disable
.name
);
3144 case LTTNG_DISABLE_ALL_EVENT
:
3146 DBG("Disabling all events");
3148 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3149 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3152 case LTTNG_ENABLE_CHANNEL
:
3154 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3155 &cmd_ctx
->lsm
->u
.channel
.chan
);
3158 case LTTNG_ENABLE_EVENT
:
3160 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3161 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3162 &cmd_ctx
->lsm
->u
.enable
.event
);
3165 case LTTNG_ENABLE_ALL_EVENT
:
3167 DBG("Enabling all events");
3169 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3170 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3171 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3174 case LTTNG_LIST_TRACEPOINTS
:
3176 struct lttng_event
*events
;
3179 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3180 if (nb_events
< 0) {
3186 * Setup lttng message with payload size set to the event list size in
3187 * bytes and then copy list into the llm payload.
3189 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3195 /* Copy event list into message payload */
3196 memcpy(cmd_ctx
->llm
->payload
, events
,
3197 sizeof(struct lttng_event
) * nb_events
);
3204 case LTTNG_START_TRACE
:
3206 ret
= cmd_start_trace(cmd_ctx
->session
);
3209 case LTTNG_STOP_TRACE
:
3211 ret
= cmd_stop_trace(cmd_ctx
->session
);
3214 case LTTNG_CREATE_SESSION
:
3216 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3217 cmd_ctx
->lsm
->session
.path
);
3220 case LTTNG_DESTROY_SESSION
:
3222 ret
= cmd_destroy_session(cmd_ctx
->session
,
3223 cmd_ctx
->lsm
->session
.name
);
3226 case LTTNG_LIST_DOMAINS
:
3229 struct lttng_domain
*domains
;
3231 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3237 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3242 /* Copy event list into message payload */
3243 memcpy(cmd_ctx
->llm
->payload
, domains
,
3244 nb_dom
* sizeof(struct lttng_domain
));
3251 case LTTNG_LIST_CHANNELS
:
3254 struct lttng_channel
*channels
;
3256 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3257 cmd_ctx
->session
, &channels
);
3263 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3268 /* Copy event list into message payload */
3269 memcpy(cmd_ctx
->llm
->payload
, channels
,
3270 nb_chan
* sizeof(struct lttng_channel
));
3277 case LTTNG_LIST_EVENTS
:
3280 struct lttng_event
*events
= NULL
;
3282 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3283 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3289 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3294 /* Copy event list into message payload */
3295 memcpy(cmd_ctx
->llm
->payload
, events
,
3296 nb_event
* sizeof(struct lttng_event
));
3303 case LTTNG_LIST_SESSIONS
:
3305 session_lock_list();
3307 if (session_list_ptr
->count
== 0) {
3308 ret
= LTTCOMM_NO_SESSION
;
3309 session_unlock_list();
3313 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3314 session_list_ptr
->count
);
3316 session_unlock_list();
3320 /* Filled the session array */
3321 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3323 session_unlock_list();
3328 case LTTNG_CALIBRATE
:
3330 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3331 &cmd_ctx
->lsm
->u
.calibrate
);
3334 case LTTNG_REGISTER_CONSUMER
:
3336 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3337 cmd_ctx
->lsm
->u
.reg
.path
);
3346 if (cmd_ctx
->llm
== NULL
) {
3347 DBG("Missing llm structure. Allocating one.");
3348 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3352 /* Set return code */
3353 cmd_ctx
->llm
->ret_code
= ret
;
3355 if (cmd_ctx
->session
) {
3356 session_unlock(cmd_ctx
->session
);
3363 * This thread manage all clients request using the unix client socket for
3366 static void *thread_manage_clients(void *data
)
3368 int sock
= 0, ret
, i
, pollfd
;
3369 uint32_t revents
, nb_fd
;
3370 struct command_ctx
*cmd_ctx
= NULL
;
3371 struct lttng_poll_event events
;
3373 DBG("[thread] Manage client started");
3375 rcu_register_thread();
3377 ret
= lttcomm_listen_unix_sock(client_sock
);
3383 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3384 * more will be added to this poll set.
3386 ret
= create_thread_poll_set(&events
, 2);
3391 /* Add the application registration socket */
3392 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3398 * Notify parent pid that we are ready to accept command for client side.
3400 if (opt_sig_parent
) {
3401 kill(ppid
, SIGCHLD
);
3405 DBG("Accepting client command ...");
3407 nb_fd
= LTTNG_POLL_GETNB(&events
);
3409 /* Inifinite blocking call, waiting for transmission */
3410 ret
= lttng_poll_wait(&events
, -1);
3415 for (i
= 0; i
< nb_fd
; i
++) {
3416 /* Fetch once the poll data */
3417 revents
= LTTNG_POLL_GETEV(&events
, i
);
3418 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3420 /* Thread quit pipe has been closed. Killing thread. */
3421 ret
= check_thread_quit_pipe(pollfd
, revents
);
3426 /* Event on the registration socket */
3427 if (pollfd
== client_sock
) {
3428 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3429 ERR("Client socket poll error");
3435 DBG("Wait for client response");
3437 sock
= lttcomm_accept_unix_sock(client_sock
);
3442 /* Allocate context command to process the client request */
3443 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3444 if (cmd_ctx
== NULL
) {
3445 perror("zmalloc cmd_ctx");
3449 /* Allocate data buffer for reception */
3450 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3451 if (cmd_ctx
->lsm
== NULL
) {
3452 perror("zmalloc cmd_ctx->lsm");
3456 cmd_ctx
->llm
= NULL
;
3457 cmd_ctx
->session
= NULL
;
3460 * Data is received from the lttng client. The struct
3461 * lttcomm_session_msg (lsm) contains the command and data request of
3464 DBG("Receiving data from client ...");
3465 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3466 sizeof(struct lttcomm_session_msg
));
3468 DBG("Nothing recv() from client... continuing");
3474 // TODO: Validate cmd_ctx including sanity check for
3475 // security purpose.
3477 rcu_thread_online();
3479 * This function dispatch the work to the kernel or userspace tracer
3480 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3481 * informations for the client. The command context struct contains
3482 * everything this function may needs.
3484 ret
= process_client_msg(cmd_ctx
);
3485 rcu_thread_offline();
3488 * TODO: Inform client somehow of the fatal error. At
3489 * this point, ret < 0 means that a zmalloc failed
3490 * (ENOMEM). Error detected but still accept command.
3492 clean_command_ctx(&cmd_ctx
);
3496 DBG("Sending response (size: %d, retcode: %s)",
3497 cmd_ctx
->lttng_msg_size
,
3498 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3499 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3501 ERR("Failed to send data back to client");
3504 clean_command_ctx(&cmd_ctx
);
3506 /* End of transmission */
3511 DBG("Client thread dying");
3512 unlink(client_unix_sock_path
);
3516 lttng_poll_clean(&events
);
3517 clean_command_ctx(&cmd_ctx
);
3519 rcu_unregister_thread();
3525 * usage function on stderr
3527 static void usage(void)
3529 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3530 fprintf(stderr
, " -h, --help Display this usage.\n");
3531 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3532 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3533 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3534 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3535 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3536 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3537 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3538 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3539 fprintf(stderr
, " --ustconsumerd32 PATH Specify path for the 32-bit UST consumer daemon binary\n");
3540 fprintf(stderr
, " --ustconsumerd64 PATH Specify path for the 64-bit UST consumer daemon binary\n");
3541 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3542 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3543 fprintf(stderr
, " -V, --version Show version number.\n");
3544 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3545 fprintf(stderr
, " -q, --quiet No output at all.\n");
3546 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3547 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3551 * daemon argument parsing
3553 static int parse_args(int argc
, char **argv
)
3557 static struct option long_options
[] = {
3558 { "client-sock", 1, 0, 'c' },
3559 { "apps-sock", 1, 0, 'a' },
3560 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3561 { "kconsumerd-err-sock", 1, 0, 'E' },
3562 { "ustconsumerd64", 1, 0, 't' },
3563 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3564 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3565 { "ustconsumerd32", 1, 0, 'u' },
3566 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3567 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3568 { "daemonize", 0, 0, 'd' },
3569 { "sig-parent", 0, 0, 'S' },
3570 { "help", 0, 0, 'h' },
3571 { "group", 1, 0, 'g' },
3572 { "version", 0, 0, 'V' },
3573 { "quiet", 0, 0, 'q' },
3574 { "verbose", 0, 0, 'v' },
3575 { "verbose-consumer", 0, 0, 'Z' },
3580 int option_index
= 0;
3581 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3582 long_options
, &option_index
);
3589 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3591 fprintf(stderr
, " with arg %s\n", optarg
);
3595 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3598 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3604 opt_tracing_group
= optarg
;
3610 fprintf(stdout
, "%s\n", VERSION
);
3616 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3619 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3622 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3625 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3628 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3631 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3637 /* Verbose level can increase using multiple -v */
3641 opt_verbose_consumer
+= 1;
3644 consumerd32_bindir
= optarg
;
3647 consumerd64_bindir
= optarg
;
3650 /* Unknown option or other error.
3651 * Error is printed by getopt, just return */
3660 * Creates the two needed socket by the daemon.
3661 * apps_sock - The communication socket for all UST apps.
3662 * client_sock - The communication of the cli tool (lttng).
3664 static int init_daemon_socket(void)
3669 old_umask
= umask(0);
3671 /* Create client tool unix socket */
3672 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3673 if (client_sock
< 0) {
3674 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3679 /* File permission MUST be 660 */
3680 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3682 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3687 /* Create the application unix socket */
3688 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3689 if (apps_sock
< 0) {
3690 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3695 /* File permission MUST be 666 */
3696 ret
= chmod(apps_unix_sock_path
,
3697 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3699 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3710 * Check if the global socket is available, and if a daemon is answering at the
3711 * other side. If yes, error is returned.
3713 static int check_existing_daemon(void)
3715 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3716 access(apps_unix_sock_path
, F_OK
) < 0) {
3720 /* Is there anybody out there ? */
3721 if (lttng_session_daemon_alive()) {
3729 * Set the tracing group gid onto the client socket.
3731 * Race window between mkdir and chown is OK because we are going from more
3732 * permissive (root.root) to les permissive (root.tracing).
3734 static int set_permissions(void)
3739 gid
= allowed_group();
3742 WARN("No tracing group detected");
3745 ERR("Missing tracing group. Aborting execution.");
3751 /* Set lttng run dir */
3752 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3754 ERR("Unable to set group on " LTTNG_RUNDIR
);
3758 /* lttng client socket path */
3759 ret
= chown(client_unix_sock_path
, 0, gid
);
3761 ERR("Unable to set group on %s", client_unix_sock_path
);
3765 /* kconsumer error socket path */
3766 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3768 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3772 /* 64-bit ustconsumer error socket path */
3773 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
3775 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
3779 /* 32-bit ustconsumer compat32 error socket path */
3780 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
3782 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
3786 DBG("All permissions are set");
3793 * Create the pipe used to wake up the kernel thread.
3795 static int create_kernel_poll_pipe(void)
3797 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3801 * Create the application command pipe to wake thread_manage_apps.
3803 static int create_apps_cmd_pipe(void)
3805 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3809 * Create the lttng run directory needed for all global sockets and pipe.
3811 static int create_lttng_rundir(void)
3815 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3817 if (errno
!= EEXIST
) {
3818 ERR("Unable to create " LTTNG_RUNDIR
);
3830 * Setup sockets and directory needed by the kconsumerd communication with the
3833 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3838 switch (consumer_data
->type
) {
3839 case LTTNG_CONSUMER_KERNEL
:
3840 path
= KCONSUMERD_PATH
;
3842 case LTTNG_CONSUMER64_UST
:
3843 path
= USTCONSUMERD64_PATH
;
3845 case LTTNG_CONSUMER32_UST
:
3846 path
= USTCONSUMERD32_PATH
;
3849 ERR("Consumer type unknown");
3854 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3856 if (errno
!= EEXIST
) {
3857 ERR("Failed to create %s", path
);
3863 /* Create the kconsumerd error unix socket */
3864 consumer_data
->err_sock
=
3865 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3866 if (consumer_data
->err_sock
< 0) {
3867 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3872 /* File permission MUST be 660 */
3873 ret
= chmod(consumer_data
->err_unix_sock_path
,
3874 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3876 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
3886 * Signal handler for the daemon
3888 * Simply stop all worker threads, leaving main() return gracefully after
3889 * joining all threads and calling cleanup().
3891 static void sighandler(int sig
)
3895 DBG("SIGPIPE catched");
3898 DBG("SIGINT catched");
3902 DBG("SIGTERM catched");
3911 * Setup signal handler for :
3912 * SIGINT, SIGTERM, SIGPIPE
3914 static int set_signal_handler(void)
3917 struct sigaction sa
;
3920 if ((ret
= sigemptyset(&sigset
)) < 0) {
3921 perror("sigemptyset");
3925 sa
.sa_handler
= sighandler
;
3926 sa
.sa_mask
= sigset
;
3928 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
3929 perror("sigaction");
3933 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
3934 perror("sigaction");
3938 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
3939 perror("sigaction");
3943 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
3949 * Set open files limit to unlimited. This daemon can open a large number of
3950 * file descriptors in order to consumer multiple kernel traces.
3952 static void set_ulimit(void)
3957 /* The kernel does not allowed an infinite limit for open files */
3958 lim
.rlim_cur
= 65535;
3959 lim
.rlim_max
= 65535;
3961 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
3963 perror("failed to set open files limit");
3970 int main(int argc
, char **argv
)
3974 const char *home_path
;
3976 rcu_register_thread();
3978 /* Create thread quit pipe */
3979 if ((ret
= init_thread_quit_pipe()) < 0) {
3983 setup_consumerd_path();
3985 /* Parse arguments */
3987 if ((ret
= parse_args(argc
, argv
) < 0)) {
4000 /* Check if daemon is UID = 0 */
4001 is_root
= !getuid();
4004 ret
= create_lttng_rundir();
4009 if (strlen(apps_unix_sock_path
) == 0) {
4010 snprintf(apps_unix_sock_path
, PATH_MAX
,
4011 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4014 if (strlen(client_unix_sock_path
) == 0) {
4015 snprintf(client_unix_sock_path
, PATH_MAX
,
4016 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4019 /* Set global SHM for ust */
4020 if (strlen(wait_shm_path
) == 0) {
4021 snprintf(wait_shm_path
, PATH_MAX
,
4022 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4025 home_path
= get_home_dir();
4026 if (home_path
== NULL
) {
4027 /* TODO: Add --socket PATH option */
4028 ERR("Can't get HOME directory for sockets creation.");
4033 if (strlen(apps_unix_sock_path
) == 0) {
4034 snprintf(apps_unix_sock_path
, PATH_MAX
,
4035 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4038 /* Set the cli tool unix socket path */
4039 if (strlen(client_unix_sock_path
) == 0) {
4040 snprintf(client_unix_sock_path
, PATH_MAX
,
4041 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4044 /* Set global SHM for ust */
4045 if (strlen(wait_shm_path
) == 0) {
4046 snprintf(wait_shm_path
, PATH_MAX
,
4047 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4051 DBG("Client socket path %s", client_unix_sock_path
);
4052 DBG("Application socket path %s", apps_unix_sock_path
);
4055 * See if daemon already exist.
4057 if ((ret
= check_existing_daemon()) < 0) {
4058 ERR("Already running daemon.\n");
4060 * We do not goto exit because we must not cleanup()
4061 * because a daemon is already running.
4066 /* After this point, we can safely call cleanup() with "goto exit" */
4069 * These actions must be executed as root. We do that *after* setting up
4070 * the sockets path because we MUST make the check for another daemon using
4071 * those paths *before* trying to set the kernel consumer sockets and init
4075 ret
= set_consumer_sockets(&kconsumer_data
);
4080 ret
= set_consumer_sockets(&ustconsumer64_data
);
4085 ret
= set_consumer_sockets(&ustconsumer32_data
);
4090 /* Setup kernel tracer */
4091 init_kernel_tracer();
4093 /* Set ulimit for open files */
4097 if ((ret
= set_signal_handler()) < 0) {
4101 /* Setup the needed unix socket */
4102 if ((ret
= init_daemon_socket()) < 0) {
4106 /* Set credentials to socket */
4107 if (is_root
&& ((ret
= set_permissions()) < 0)) {
4111 /* Get parent pid if -S, --sig-parent is specified. */
4112 if (opt_sig_parent
) {
4116 /* Setup the kernel pipe for waking up the kernel thread */
4117 if ((ret
= create_kernel_poll_pipe()) < 0) {
4121 /* Setup the thread apps communication pipe. */
4122 if ((ret
= create_apps_cmd_pipe()) < 0) {
4126 /* Init UST command queue. */
4127 cds_wfq_init(&ust_cmd_queue
.queue
);
4129 /* Init UST app hash table */
4133 * Get session list pointer. This pointer MUST NOT be free(). This list is
4134 * statically declared in session.c
4136 session_list_ptr
= session_get_list();
4138 /* Set up max poll set size */
4139 lttng_poll_set_max_size();
4141 /* Create thread to manage the client socket */
4142 ret
= pthread_create(&client_thread
, NULL
,
4143 thread_manage_clients
, (void *) NULL
);
4145 perror("pthread_create clients");
4149 /* Create thread to dispatch registration */
4150 ret
= pthread_create(&dispatch_thread
, NULL
,
4151 thread_dispatch_ust_registration
, (void *) NULL
);
4153 perror("pthread_create dispatch");
4157 /* Create thread to manage application registration. */
4158 ret
= pthread_create(®_apps_thread
, NULL
,
4159 thread_registration_apps
, (void *) NULL
);
4161 perror("pthread_create registration");
4165 /* Create thread to manage application socket */
4166 ret
= pthread_create(&apps_thread
, NULL
,
4167 thread_manage_apps
, (void *) NULL
);
4169 perror("pthread_create apps");
4173 /* Create kernel thread to manage kernel event */
4174 ret
= pthread_create(&kernel_thread
, NULL
,
4175 thread_manage_kernel
, (void *) NULL
);
4177 perror("pthread_create kernel");
4181 ret
= pthread_join(kernel_thread
, &status
);
4183 perror("pthread_join");
4184 goto error
; /* join error, exit without cleanup */
4188 ret
= pthread_join(apps_thread
, &status
);
4190 perror("pthread_join");
4191 goto error
; /* join error, exit without cleanup */
4195 ret
= pthread_join(reg_apps_thread
, &status
);
4197 perror("pthread_join");
4198 goto error
; /* join error, exit without cleanup */
4202 ret
= pthread_join(dispatch_thread
, &status
);
4204 perror("pthread_join");
4205 goto error
; /* join error, exit without cleanup */
4209 ret
= pthread_join(client_thread
, &status
);
4211 perror("pthread_join");
4212 goto error
; /* join error, exit without cleanup */
4215 ret
= join_consumer_thread(&kconsumer_data
);
4217 perror("join_consumer");
4218 goto error
; /* join error, exit without cleanup */
4224 * cleanup() is called when no other thread is running.
4226 rcu_thread_online();
4228 rcu_thread_offline();
4229 rcu_unregister_thread();