2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include <semaphore.h>
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
34 #include <sys/types.h>
36 #include <urcu/futex.h>
40 #include <common/common.h>
41 #include <common/compat/poll.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
47 #include "lttng-sessiond.h"
59 #define CONSUMERD_FILE "lttng-consumerd"
61 struct consumer_data
{
62 enum lttng_consumer_type type
;
64 pthread_t thread
; /* Worker thread interacting with the consumer */
67 /* Mutex to control consumerd pid assignation */
68 pthread_mutex_t pid_mutex
;
74 /* consumer error and command Unix socket path */
75 char err_unix_sock_path
[PATH_MAX
];
76 char cmd_unix_sock_path
[PATH_MAX
];
79 #include "benchmark.h"
82 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
83 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
84 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
85 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
88 const char *opt_tracing_group
;
89 static int opt_sig_parent
;
90 static int opt_verbose_consumer
;
91 static int opt_daemon
;
92 static int opt_no_kernel
;
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 */
97 /* Consumer daemon specific control data */
98 static struct consumer_data kconsumer_data
= {
99 .type
= LTTNG_CONSUMER_KERNEL
,
100 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
101 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
105 static struct consumer_data ustconsumer64_data
= {
106 .type
= LTTNG_CONSUMER64_UST
,
107 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
108 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
112 static struct consumer_data ustconsumer32_data
= {
113 .type
= LTTNG_CONSUMER32_UST
,
114 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
115 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
120 static int dispatch_thread_exit
;
122 /* Global application Unix socket path */
123 static char apps_unix_sock_path
[PATH_MAX
];
124 /* Global client Unix socket path */
125 static char client_unix_sock_path
[PATH_MAX
];
126 /* global wait shm path for UST */
127 static char wait_shm_path
[PATH_MAX
];
129 /* Sockets and FDs */
130 static int client_sock
= -1;
131 static int apps_sock
= -1;
132 static int kernel_tracer_fd
= -1;
133 static int kernel_poll_pipe
[2] = { -1, -1 };
136 * Quit pipe for all threads. This permits a single cancellation point
137 * for all threads when receiving an event on the pipe.
139 static int thread_quit_pipe
[2] = { -1, -1 };
142 * This pipe is used to inform the thread managing application communication
143 * that a command is queued and ready to be processed.
145 static int apps_cmd_pipe
[2] = { -1, -1 };
147 /* Pthread, Mutexes and Semaphores */
148 static pthread_t apps_thread
;
149 static pthread_t reg_apps_thread
;
150 static pthread_t client_thread
;
151 static pthread_t kernel_thread
;
152 static pthread_t dispatch_thread
;
156 * UST registration command queue. This queue is tied with a futex and uses a N
157 * wakers / 1 waiter implemented and detailed in futex.c/.h
159 * The thread_manage_apps and thread_dispatch_ust_registration interact with
160 * this queue and the wait/wake scheme.
162 static struct ust_cmd_queue ust_cmd_queue
;
165 * Pointer initialized before thread creation.
167 * This points to the tracing session list containing the session count and a
168 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
169 * MUST NOT be taken if you call a public function in session.c.
171 * The lock is nested inside the structure: session_list_ptr->lock. Please use
172 * session_lock_list and session_unlock_list for lock acquisition.
174 static struct ltt_session_list
*session_list_ptr
;
176 int ust_consumerd64_fd
= -1;
177 int ust_consumerd32_fd
= -1;
179 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
180 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
181 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
182 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
185 void setup_consumerd_path(void)
187 const char *bin
, *libdir
;
190 * Allow INSTALL_BIN_PATH to be used as a target path for the
191 * native architecture size consumer if CONFIG_CONSUMER*_PATH
192 * has not been defined.
194 #if (CAA_BITS_PER_LONG == 32)
195 if (!consumerd32_bin
[0]) {
196 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
198 if (!consumerd32_libdir
[0]) {
199 consumerd32_libdir
= INSTALL_LIB_PATH
;
201 #elif (CAA_BITS_PER_LONG == 64)
202 if (!consumerd64_bin
[0]) {
203 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
205 if (!consumerd64_libdir
[0]) {
206 consumerd64_libdir
= INSTALL_LIB_PATH
;
209 #error "Unknown bitness"
213 * runtime env. var. overrides the build default.
215 bin
= getenv("LTTNG_CONSUMERD32_BIN");
217 consumerd32_bin
= bin
;
219 bin
= getenv("LTTNG_CONSUMERD64_BIN");
221 consumerd64_bin
= bin
;
223 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
225 consumerd32_libdir
= libdir
;
227 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
229 consumerd64_libdir
= libdir
;
234 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 static int create_thread_poll_set(struct lttng_poll_event
*events
,
241 if (events
== NULL
|| size
== 0) {
246 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
252 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
264 * Check if the thread quit pipe was triggered.
266 * Return 1 if it was triggered else 0;
268 static int check_thread_quit_pipe(int fd
, uint32_t events
)
270 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
278 * Return group ID of the tracing group or -1 if not found.
280 static gid_t
allowed_group(void)
284 if (opt_tracing_group
) {
285 grp
= getgrnam(opt_tracing_group
);
287 grp
= getgrnam(default_tracing_group
);
297 * Init thread quit pipe.
299 * Return -1 on error or 0 if all pipes are created.
301 static int init_thread_quit_pipe(void)
305 ret
= pipe(thread_quit_pipe
);
307 PERROR("thread quit pipe");
311 for (i
= 0; i
< 2; i
++) {
312 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
324 * Complete teardown of a kernel session. This free all data structure related
325 * to a kernel session and update counter.
327 static void teardown_kernel_session(struct ltt_session
*session
)
329 if (!session
->kernel_session
) {
330 DBG3("No kernel session when tearing down session");
334 DBG("Tearing down kernel session");
337 * If a custom kernel consumer was registered, close the socket before
338 * tearing down the complete kernel session structure
340 if (kconsumer_data
.cmd_sock
>= 0 &&
341 session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
342 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
345 trace_kernel_destroy_session(session
->kernel_session
);
349 * Complete teardown of all UST sessions. This will free everything on his path
350 * and destroy the core essence of all ust sessions :)
352 static void teardown_ust_session(struct ltt_session
*session
)
356 if (!session
->ust_session
) {
357 DBG3("No UST session when tearing down session");
361 DBG("Tearing down UST session(s)");
363 ret
= ust_app_destroy_trace_all(session
->ust_session
);
365 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
;
401 DBG("Removing %s directory", rundir
);
402 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
404 ERR("asprintf failed. Something is really wrong!");
407 /* Remove lttng run directory */
410 ERR("Unable to clean %s", rundir
);
414 DBG("Cleaning up all sessions");
416 /* Destroy session list mutex */
417 if (session_list_ptr
!= NULL
) {
418 pthread_mutex_destroy(&session_list_ptr
->lock
);
420 /* Cleanup ALL session */
421 cds_list_for_each_entry_safe(sess
, stmp
,
422 &session_list_ptr
->head
, list
) {
423 teardown_kernel_session(sess
);
424 teardown_ust_session(sess
);
429 DBG("Closing all UST sockets");
430 ust_app_clean_list();
432 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
434 if (is_root
&& !opt_no_kernel
) {
435 DBG2("Closing kernel fd");
436 if (kernel_tracer_fd
>= 0) {
437 ret
= close(kernel_tracer_fd
);
442 DBG("Unloading kernel modules");
443 modprobe_remove_lttng_all();
447 * Closing all pipes used for communication between threads.
449 for (i
= 0; i
< 2; i
++) {
450 if (kernel_poll_pipe
[i
] >= 0) {
451 ret
= close(kernel_poll_pipe
[i
]);
458 for (i
= 0; i
< 2; i
++) {
459 if (thread_quit_pipe
[i
] >= 0) {
460 ret
= close(thread_quit_pipe
[i
]);
466 for (i
= 0; i
< 2; i
++) {
467 if (apps_cmd_pipe
[i
] >= 0) {
468 ret
= close(apps_cmd_pipe
[i
]);
475 /* OUTPUT BENCHMARK RESULTS */
478 if (getenv("BENCH_UST_NOTIFY")) {
479 bench_print_ust_notification();
482 if (getenv("BENCH_UST_REGISTER")) {
483 bench_print_ust_register();
484 bench_print_ust_unregister();
487 if (getenv("BENCH_BOOT_PROCESS")) {
488 bench_print_boot_process();
491 if (getenv("BENCH_COMMANDS")) {
492 bench_print_enable_ust_event();
499 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
500 "Matthew, BEET driven development works!%c[%dm",
501 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
506 * Send data on a unix socket using the liblttsessiondcomm API.
508 * Return lttcomm error code.
510 static int send_unix_sock(int sock
, void *buf
, size_t len
)
512 /* Check valid length */
517 return lttcomm_send_unix_sock(sock
, buf
, len
);
521 * Free memory of a command context structure.
523 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
525 DBG("Clean command context structure");
527 if ((*cmd_ctx
)->llm
) {
528 free((*cmd_ctx
)->llm
);
530 if ((*cmd_ctx
)->lsm
) {
531 free((*cmd_ctx
)->lsm
);
539 * Send all stream fds of kernel channel to the consumer.
541 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
542 int sock
, struct ltt_kernel_channel
*channel
,
543 uid_t uid
, gid_t gid
)
546 struct ltt_kernel_stream
*stream
;
547 struct lttcomm_consumer_msg lkm
;
549 DBG("Sending streams of channel %s to kernel consumer",
550 channel
->channel
->name
);
553 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
554 lkm
.u
.channel
.channel_key
= channel
->fd
;
555 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
556 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
557 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
558 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
560 PERROR("send consumer channel");
565 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
569 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
570 lkm
.u
.stream
.channel_key
= channel
->fd
;
571 lkm
.u
.stream
.stream_key
= stream
->fd
;
572 lkm
.u
.stream
.state
= stream
->state
;
573 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
574 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
575 lkm
.u
.stream
.uid
= uid
;
576 lkm
.u
.stream
.gid
= gid
;
577 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
578 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
579 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
580 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
582 PERROR("send consumer stream");
585 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
587 PERROR("send consumer stream ancillary data");
592 DBG("consumer channel streams sent");
601 * Send all stream fds of the kernel session to the consumer.
603 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
604 struct ltt_kernel_session
*session
)
607 struct ltt_kernel_channel
*chan
;
608 struct lttcomm_consumer_msg lkm
;
609 int sock
= session
->consumer_fd
;
611 DBG("Sending metadata stream fd");
613 /* Extra protection. It's NOT supposed to be set to -1 at this point */
614 if (session
->consumer_fd
< 0) {
615 session
->consumer_fd
= consumer_data
->cmd_sock
;
618 if (session
->metadata_stream_fd
>= 0) {
619 /* Send metadata channel fd */
620 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
621 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
622 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
623 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
624 DBG("Sending metadata channel %d to consumer", lkm
.u
.channel
.channel_key
);
625 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
627 PERROR("send consumer channel");
631 /* Send metadata stream fd */
632 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
633 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
634 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
635 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
636 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
637 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
638 lkm
.u
.stream
.uid
= session
->uid
;
639 lkm
.u
.stream
.gid
= session
->gid
;
640 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
641 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
642 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
643 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
645 PERROR("send consumer stream");
648 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
650 PERROR("send consumer stream");
655 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
656 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
657 session
->uid
, session
->gid
);
663 DBG("consumer fds (metadata and channel streams) sent");
672 * Notify UST applications using the shm mmap futex.
674 static int notify_ust_apps(int active
)
678 DBG("Notifying applications of session daemon state: %d", active
);
680 /* See shm.c for this call implying mmap, shm and futex calls */
681 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
682 if (wait_shm_mmap
== NULL
) {
686 tracepoint(ust_notify_apps_start
);
688 /* Wake waiting process */
689 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
691 tracepoint(ust_notify_apps_stop
);
693 /* Apps notified successfully */
701 * Setup the outgoing data buffer for the response (llm) by allocating the
702 * right amount of memory and copying the original information from the lsm
705 * Return total size of the buffer pointed by buf.
707 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
713 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
714 if (cmd_ctx
->llm
== NULL
) {
720 /* Copy common data */
721 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
722 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
724 cmd_ctx
->llm
->data_size
= size
;
725 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
734 * Update the kernel poll set of all channel fd available over all tracing
735 * session. Add the wakeup pipe at the end of the set.
737 static int update_kernel_poll(struct lttng_poll_event
*events
)
740 struct ltt_session
*session
;
741 struct ltt_kernel_channel
*channel
;
743 DBG("Updating kernel poll set");
746 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
747 session_lock(session
);
748 if (session
->kernel_session
== NULL
) {
749 session_unlock(session
);
753 cds_list_for_each_entry(channel
,
754 &session
->kernel_session
->channel_list
.head
, list
) {
755 /* Add channel fd to the kernel poll set */
756 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
758 session_unlock(session
);
761 DBG("Channel fd %d added to kernel set", channel
->fd
);
763 session_unlock(session
);
765 session_unlock_list();
770 session_unlock_list();
775 * Find the channel fd from 'fd' over all tracing session. When found, check
776 * for new channel stream and send those stream fds to the kernel consumer.
778 * Useful for CPU hotplug feature.
780 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
783 struct ltt_session
*session
;
784 struct ltt_kernel_channel
*channel
;
786 DBG("Updating kernel streams for channel fd %d", fd
);
789 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
790 session_lock(session
);
791 if (session
->kernel_session
== NULL
) {
792 session_unlock(session
);
796 /* This is not suppose to be -1 but this is an extra security check */
797 if (session
->kernel_session
->consumer_fd
< 0) {
798 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
801 cds_list_for_each_entry(channel
,
802 &session
->kernel_session
->channel_list
.head
, list
) {
803 if (channel
->fd
== fd
) {
804 DBG("Channel found, updating kernel streams");
805 ret
= kernel_open_channel_stream(channel
);
811 * Have we already sent fds to the consumer? If yes, it means
812 * that tracing is started so it is safe to send our updated
815 if (session
->kernel_session
->consumer_fds_sent
== 1) {
816 ret
= send_kconsumer_channel_streams(consumer_data
,
817 session
->kernel_session
->consumer_fd
, channel
,
818 session
->uid
, session
->gid
);
826 session_unlock(session
);
828 session_unlock_list();
832 session_unlock(session
);
833 session_unlock_list();
838 * For each tracing session, update newly registered apps.
840 static void update_ust_app(int app_sock
)
842 struct ltt_session
*sess
, *stmp
;
846 /* For all tracing session(s) */
847 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
849 if (sess
->ust_session
) {
850 ust_app_global_update(sess
->ust_session
, app_sock
);
852 session_unlock(sess
);
855 session_unlock_list();
859 * This thread manage event coming from the kernel.
861 * Features supported in this thread:
864 static void *thread_manage_kernel(void *data
)
866 int ret
, i
, pollfd
, update_poll_flag
= 1;
867 uint32_t revents
, nb_fd
;
869 struct lttng_poll_event events
;
871 tracepoint(sessiond_th_kern_start
);
873 DBG("Thread manage kernel started");
875 ret
= create_thread_poll_set(&events
, 2);
877 goto error_poll_create
;
880 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
886 if (update_poll_flag
== 1) {
888 * Reset number of fd in the poll set. Always 2 since there is the thread
889 * quit pipe and the kernel pipe.
893 ret
= update_kernel_poll(&events
);
897 update_poll_flag
= 0;
900 nb_fd
= LTTNG_POLL_GETNB(&events
);
902 DBG("Thread kernel polling on %d fds", nb_fd
);
904 /* Zeroed the poll events */
905 lttng_poll_reset(&events
);
907 tracepoint(sessiond_th_kern_poll
);
909 /* Poll infinite value of time */
911 ret
= lttng_poll_wait(&events
, -1);
914 * Restart interrupted system call.
916 if (errno
== EINTR
) {
920 } else if (ret
== 0) {
921 /* Should not happen since timeout is infinite */
922 ERR("Return value of poll is 0 with an infinite timeout.\n"
923 "This should not have happened! Continuing...");
927 for (i
= 0; i
< nb_fd
; i
++) {
928 /* Fetch once the poll data */
929 revents
= LTTNG_POLL_GETEV(&events
, i
);
930 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
932 /* Thread quit pipe has been closed. Killing thread. */
933 ret
= check_thread_quit_pipe(pollfd
, revents
);
938 /* Check for data on kernel pipe */
939 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
940 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
941 update_poll_flag
= 1;
945 * New CPU detected by the kernel. Adding kernel stream to
946 * kernel session and updating the kernel consumer
948 if (revents
& LPOLLIN
) {
949 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
955 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
956 * and unregister kernel stream at this point.
964 lttng_poll_clean(&events
);
966 DBG("Kernel thread dying");
971 * This thread manage the consumer error sent back to the session daemon.
973 static void *thread_manage_consumer(void *data
)
975 int sock
= -1, i
, ret
, pollfd
;
976 uint32_t revents
, nb_fd
;
977 enum lttcomm_return_code code
;
978 struct lttng_poll_event events
;
979 struct consumer_data
*consumer_data
= data
;
981 tracepoint(sessiond_th_kcon_start
);
983 DBG("[thread] Manage consumer started");
985 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
991 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
992 * Nothing more will be added to this poll set.
994 ret
= create_thread_poll_set(&events
, 2);
999 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1004 nb_fd
= LTTNG_POLL_GETNB(&events
);
1006 tracepoint(sessiond_th_kcon_poll
);
1008 /* Inifinite blocking call, waiting for transmission */
1010 ret
= lttng_poll_wait(&events
, -1);
1013 * Restart interrupted system call.
1015 if (errno
== EINTR
) {
1021 for (i
= 0; i
< nb_fd
; i
++) {
1022 /* Fetch once the poll data */
1023 revents
= LTTNG_POLL_GETEV(&events
, i
);
1024 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1026 /* Thread quit pipe has been closed. Killing thread. */
1027 ret
= check_thread_quit_pipe(pollfd
, revents
);
1032 /* Event on the registration socket */
1033 if (pollfd
== consumer_data
->err_sock
) {
1034 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1035 ERR("consumer err socket poll error");
1041 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1046 DBG2("Receiving code from consumer err_sock");
1048 /* Getting status code from kconsumerd */
1049 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1050 sizeof(enum lttcomm_return_code
));
1055 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1056 consumer_data
->cmd_sock
=
1057 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1058 if (consumer_data
->cmd_sock
< 0) {
1059 sem_post(&consumer_data
->sem
);
1060 PERROR("consumer connect");
1063 /* Signal condition to tell that the kconsumerd is ready */
1064 sem_post(&consumer_data
->sem
);
1065 DBG("consumer command socket ready");
1067 ERR("consumer error when waiting for SOCK_READY : %s",
1068 lttcomm_get_readable_code(-code
));
1072 /* Remove the kconsumerd error sock since we've established a connexion */
1073 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1078 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1083 /* Update number of fd */
1084 nb_fd
= LTTNG_POLL_GETNB(&events
);
1086 /* Inifinite blocking call, waiting for transmission */
1088 ret
= lttng_poll_wait(&events
, -1);
1091 * Restart interrupted system call.
1093 if (errno
== EINTR
) {
1099 for (i
= 0; i
< nb_fd
; i
++) {
1100 /* Fetch once the poll data */
1101 revents
= LTTNG_POLL_GETEV(&events
, i
);
1102 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1104 /* Thread quit pipe has been closed. Killing thread. */
1105 ret
= check_thread_quit_pipe(pollfd
, revents
);
1110 /* Event on the kconsumerd socket */
1111 if (pollfd
== sock
) {
1112 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1113 ERR("consumer err socket second poll error");
1119 /* Wait for any kconsumerd error */
1120 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1121 sizeof(enum lttcomm_return_code
));
1123 ERR("consumer closed the command socket");
1127 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1130 if (consumer_data
->err_sock
>= 0) {
1131 ret
= close(consumer_data
->err_sock
);
1136 if (consumer_data
->cmd_sock
>= 0) {
1137 ret
= close(consumer_data
->cmd_sock
);
1149 unlink(consumer_data
->err_unix_sock_path
);
1150 unlink(consumer_data
->cmd_unix_sock_path
);
1151 consumer_data
->pid
= 0;
1153 lttng_poll_clean(&events
);
1156 DBG("consumer thread cleanup completed");
1162 * This thread manage application communication.
1164 static void *thread_manage_apps(void *data
)
1167 uint32_t revents
, nb_fd
;
1168 struct ust_command ust_cmd
;
1169 struct lttng_poll_event events
;
1171 tracepoint(sessiond_th_apps_start
);
1173 DBG("[thread] Manage application started");
1175 rcu_register_thread();
1176 rcu_thread_online();
1178 ret
= create_thread_poll_set(&events
, 2);
1180 goto error_poll_create
;
1183 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1189 /* Zeroed the events structure */
1190 lttng_poll_reset(&events
);
1192 nb_fd
= LTTNG_POLL_GETNB(&events
);
1194 DBG("Apps thread polling on %d fds", nb_fd
);
1196 tracepoint(sessiond_th_apps_poll
);
1198 /* Inifinite blocking call, waiting for transmission */
1200 ret
= lttng_poll_wait(&events
, -1);
1203 * Restart interrupted system call.
1205 if (errno
== EINTR
) {
1211 for (i
= 0; i
< nb_fd
; i
++) {
1212 /* Fetch once the poll data */
1213 revents
= LTTNG_POLL_GETEV(&events
, i
);
1214 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1216 /* Thread quit pipe has been closed. Killing thread. */
1217 ret
= check_thread_quit_pipe(pollfd
, revents
);
1222 /* Inspect the apps cmd pipe */
1223 if (pollfd
== apps_cmd_pipe
[0]) {
1224 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1225 ERR("Apps command pipe error");
1227 } else if (revents
& LPOLLIN
) {
1228 system("sysctl vm.drop_caches=3");
1229 tracepoint(ust_register_read_start
);
1231 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1232 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1233 PERROR("read apps cmd pipe");
1236 tracepoint(ust_register_read_stop
);
1238 tracepoint(ust_register_add_start
);
1239 /* Register applicaton to the session daemon */
1240 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1242 if (ret
== -ENOMEM
) {
1244 } else if (ret
< 0) {
1247 tracepoint(ust_register_add_stop
);
1250 * Validate UST version compatibility.
1252 ret
= ust_app_validate_version(ust_cmd
.sock
);
1255 * Add channel(s) and event(s) to newly registered apps
1256 * from lttng global UST domain.
1258 update_ust_app(ust_cmd
.sock
);
1261 tracepoint(ust_register_done_start
);
1262 ret
= ust_app_register_done(ust_cmd
.sock
);
1265 * If the registration is not possible, we simply
1266 * unregister the apps and continue
1268 ust_app_unregister(ust_cmd
.sock
);
1270 tracepoint(ust_register_done_stop
);
1272 * We just need here to monitor the close of the UST
1273 * socket and poll set monitor those by default.
1274 * Listen on POLLIN (even if we never expect any
1275 * data) to ensure that hangup wakes us.
1277 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1282 DBG("Apps with sock %d added to poll set",
1289 * At this point, we know that a registered application made
1290 * the event at poll_wait.
1292 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1293 tracepoint(ust_unregister_start
);
1295 /* Removing from the poll set */
1296 ret
= lttng_poll_del(&events
, pollfd
);
1301 /* Socket closed on remote end. */
1302 ust_app_unregister(pollfd
);
1304 tracepoint(ust_unregister_stop
);
1312 lttng_poll_clean(&events
);
1314 DBG("Application communication apps thread cleanup complete");
1315 rcu_thread_offline();
1316 rcu_unregister_thread();
1321 * Dispatch request from the registration threads to the application
1322 * communication thread.
1324 static void *thread_dispatch_ust_registration(void *data
)
1327 struct cds_wfq_node
*node
;
1328 struct ust_command
*ust_cmd
= NULL
;
1330 tracepoint(sessiond_th_dispatch_start
);
1332 DBG("[thread] Dispatch UST command started");
1334 while (!dispatch_thread_exit
) {
1335 /* Atomically prepare the queue futex */
1336 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1339 tracepoint(sessiond_th_dispatch_block
);
1341 /* Dequeue command for registration */
1342 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1344 DBG("Woken up but nothing in the UST command queue");
1345 /* Continue thread execution */
1349 tracepoint(ust_dispatch_register_start
);
1351 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1353 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1354 " gid:%d sock:%d name:%s (version %d.%d)",
1355 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1356 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1357 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1358 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1360 * Inform apps thread of the new application registration. This
1361 * call is blocking so we can be assured that the data will be read
1362 * at some point in time or wait to the end of the world :)
1364 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1365 sizeof(struct ust_command
));
1367 PERROR("write apps cmd pipe");
1368 if (errno
== EBADF
) {
1370 * We can't inform the application thread to process
1371 * registration. We will exit or else application
1372 * registration will not occur and tracing will never
1379 } while (node
!= NULL
);
1381 tracepoint(ust_dispatch_register_stop
);
1383 /* Futex wait on queue. Blocking call on futex() */
1384 futex_nto1_wait(&ust_cmd_queue
.futex
);
1388 DBG("Dispatch thread dying");
1393 * This thread manage application registration.
1395 static void *thread_registration_apps(void *data
)
1397 int sock
= -1, i
, ret
, pollfd
;
1398 uint32_t revents
, nb_fd
;
1399 struct lttng_poll_event events
;
1401 * Get allocated in this thread, enqueued to a global queue, dequeued and
1402 * freed in the manage apps thread.
1404 struct ust_command
*ust_cmd
= NULL
;
1406 tracepoint(sessiond_th_reg_start
);
1408 DBG("[thread] Manage application registration started");
1410 ret
= lttcomm_listen_unix_sock(apps_sock
);
1416 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1417 * more will be added to this poll set.
1419 ret
= create_thread_poll_set(&events
, 2);
1421 goto error_create_poll
;
1424 /* Add the application registration socket */
1425 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1427 goto error_poll_add
;
1430 /* Notify all applications to register */
1431 ret
= notify_ust_apps(1);
1433 ERR("Failed to notify applications or create the wait shared memory.\n"
1434 "Execution continues but there might be problem for already\n"
1435 "running applications that wishes to register.");
1439 DBG("Accepting application registration");
1441 tracepoint(sessiond_th_reg_poll
);
1443 nb_fd
= LTTNG_POLL_GETNB(&events
);
1445 /* Inifinite blocking call, waiting for transmission */
1447 ret
= lttng_poll_wait(&events
, -1);
1450 * Restart interrupted system call.
1452 if (errno
== EINTR
) {
1458 for (i
= 0; i
< nb_fd
; i
++) {
1459 /* Fetch once the poll data */
1460 revents
= LTTNG_POLL_GETEV(&events
, i
);
1461 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1463 /* Thread quit pipe has been closed. Killing thread. */
1464 ret
= check_thread_quit_pipe(pollfd
, revents
);
1469 /* Event on the registration socket */
1470 if (pollfd
== apps_sock
) {
1471 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1472 ERR("Register apps socket poll error");
1474 } else if (revents
& LPOLLIN
) {
1475 /* Registration starts here. Recording cycles */
1476 tracepoint(ust_register_start
);
1478 sock
= lttcomm_accept_unix_sock(apps_sock
);
1483 /* Create UST registration command for enqueuing */
1484 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1485 if (ust_cmd
== NULL
) {
1486 PERROR("ust command zmalloc");
1491 * Using message-based transmissions to ensure we don't
1492 * have to deal with partially received messages.
1494 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1496 ERR("Exhausted file descriptors allowed for applications.");
1505 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1506 sizeof(struct ust_register_msg
));
1507 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1509 PERROR("lttcomm_recv_unix_sock register apps");
1511 ERR("Wrong size received on apps register");
1518 lttng_fd_put(LTTNG_FD_APPS
, 1);
1523 ust_cmd
->sock
= sock
;
1526 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1527 " gid:%d sock:%d name:%s (version %d.%d)",
1528 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1529 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1530 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1531 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1534 * Lock free enqueue the registration request. The red pill
1535 * has been taken! This apps will be part of the *system*.
1537 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1540 * Wake the registration queue futex. Implicit memory
1541 * barrier with the exchange in cds_wfq_enqueue.
1543 futex_nto1_wake(&ust_cmd_queue
.futex
);
1545 tracepoint(ust_register_stop
);
1552 /* Notify that the registration thread is gone */
1555 if (apps_sock
>= 0) {
1556 ret
= close(apps_sock
);
1566 lttng_fd_put(LTTNG_FD_APPS
, 1);
1568 unlink(apps_unix_sock_path
);
1571 lttng_poll_clean(&events
);
1574 DBG("UST Registration thread cleanup complete");
1580 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1581 * exec or it will fails.
1583 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1586 struct timespec timeout
;
1588 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1589 timeout
.tv_nsec
= 0;
1591 /* Setup semaphore */
1592 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1594 PERROR("sem_init consumer semaphore");
1598 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1599 thread_manage_consumer
, consumer_data
);
1601 PERROR("pthread_create consumer");
1606 /* Get time for sem_timedwait absolute timeout */
1607 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1609 PERROR("clock_gettime spawn consumer");
1610 /* Infinite wait for the kconsumerd thread to be ready */
1611 ret
= sem_wait(&consumer_data
->sem
);
1613 /* Normal timeout if the gettime was successful */
1614 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1615 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1619 if (errno
== ETIMEDOUT
) {
1621 * Call has timed out so we kill the kconsumerd_thread and return
1624 ERR("The consumer thread was never ready. Killing it");
1625 ret
= pthread_cancel(consumer_data
->thread
);
1627 PERROR("pthread_cancel consumer thread");
1630 PERROR("semaphore wait failed consumer thread");
1635 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1636 if (consumer_data
->pid
== 0) {
1637 ERR("Kconsumerd did not start");
1638 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1641 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1650 * Join consumer thread
1652 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1657 if (consumer_data
->pid
!= 0) {
1658 ret
= kill(consumer_data
->pid
, SIGTERM
);
1660 ERR("Error killing consumer daemon");
1663 return pthread_join(consumer_data
->thread
, &status
);
1670 * Fork and exec a consumer daemon (consumerd).
1672 * Return pid if successful else -1.
1674 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1678 const char *consumer_to_use
;
1679 const char *verbosity
;
1682 DBG("Spawning consumerd");
1689 if (opt_verbose_consumer
) {
1690 verbosity
= "--verbose";
1692 verbosity
= "--quiet";
1694 switch (consumer_data
->type
) {
1695 case LTTNG_CONSUMER_KERNEL
:
1697 * Find out which consumerd to execute. We will first try the
1698 * 64-bit path, then the sessiond's installation directory, and
1699 * fallback on the 32-bit one,
1701 DBG3("Looking for a kernel consumer at these locations:");
1702 DBG3(" 1) %s", consumerd64_bin
);
1703 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1704 DBG3(" 3) %s", consumerd32_bin
);
1705 if (stat(consumerd64_bin
, &st
) == 0) {
1706 DBG3("Found location #1");
1707 consumer_to_use
= consumerd64_bin
;
1708 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1709 DBG3("Found location #2");
1710 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1711 } else if (stat(consumerd32_bin
, &st
) == 0) {
1712 DBG3("Found location #3");
1713 consumer_to_use
= consumerd32_bin
;
1715 DBG("Could not find any valid consumerd executable");
1718 DBG("Using kernel consumer at: %s", consumer_to_use
);
1719 execl(consumer_to_use
,
1720 "lttng-consumerd", verbosity
, "-k",
1721 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1722 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1725 case LTTNG_CONSUMER64_UST
:
1727 char *tmpnew
= NULL
;
1729 if (consumerd64_libdir
[0] != '\0') {
1733 tmp
= getenv("LD_LIBRARY_PATH");
1737 tmplen
= strlen("LD_LIBRARY_PATH=")
1738 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1739 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1744 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1745 strcat(tmpnew
, consumerd64_libdir
);
1746 if (tmp
[0] != '\0') {
1747 strcat(tmpnew
, ":");
1748 strcat(tmpnew
, tmp
);
1750 ret
= putenv(tmpnew
);
1756 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1757 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1758 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1759 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1761 if (consumerd64_libdir
[0] != '\0') {
1769 case LTTNG_CONSUMER32_UST
:
1771 char *tmpnew
= NULL
;
1773 if (consumerd32_libdir
[0] != '\0') {
1777 tmp
= getenv("LD_LIBRARY_PATH");
1781 tmplen
= strlen("LD_LIBRARY_PATH=")
1782 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1783 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1788 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1789 strcat(tmpnew
, consumerd32_libdir
);
1790 if (tmp
[0] != '\0') {
1791 strcat(tmpnew
, ":");
1792 strcat(tmpnew
, tmp
);
1794 ret
= putenv(tmpnew
);
1800 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1801 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1802 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1803 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1805 if (consumerd32_libdir
[0] != '\0') {
1814 PERROR("unknown consumer type");
1818 PERROR("kernel start consumer exec");
1821 } else if (pid
> 0) {
1824 PERROR("start consumer fork");
1832 * Spawn the consumerd daemon and session daemon thread.
1834 static int start_consumerd(struct consumer_data
*consumer_data
)
1838 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1839 if (consumer_data
->pid
!= 0) {
1840 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1844 ret
= spawn_consumerd(consumer_data
);
1846 ERR("Spawning consumerd failed");
1847 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1851 /* Setting up the consumer_data pid */
1852 consumer_data
->pid
= ret
;
1853 DBG2("Consumer pid %d", consumer_data
->pid
);
1854 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1856 DBG2("Spawning consumer control thread");
1857 ret
= spawn_consumer_thread(consumer_data
);
1859 ERR("Fatal error spawning consumer control thread");
1871 * Check version of the lttng-modules.
1873 static int validate_lttng_modules_version(void)
1875 return kernel_validate_version(kernel_tracer_fd
);
1879 * Setup necessary data for kernel tracer action.
1881 static int init_kernel_tracer(void)
1885 /* Modprobe lttng kernel modules */
1886 ret
= modprobe_lttng_control();
1891 /* Open debugfs lttng */
1892 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1893 if (kernel_tracer_fd
< 0) {
1894 DBG("Failed to open %s", module_proc_lttng
);
1899 /* Validate kernel version */
1900 ret
= validate_lttng_modules_version();
1905 ret
= modprobe_lttng_data();
1910 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1914 modprobe_remove_lttng_control();
1915 ret
= close(kernel_tracer_fd
);
1919 kernel_tracer_fd
= -1;
1920 return LTTCOMM_KERN_VERSION
;
1923 ret
= close(kernel_tracer_fd
);
1929 modprobe_remove_lttng_control();
1932 WARN("No kernel tracer available");
1933 kernel_tracer_fd
= -1;
1935 return LTTCOMM_NEED_ROOT_SESSIOND
;
1937 return LTTCOMM_KERN_NA
;
1942 * Init tracing by creating trace directory and sending fds kernel consumer.
1944 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1948 if (session
->consumer_fds_sent
== 0) {
1950 * Assign default kernel consumer socket if no consumer assigned to the
1951 * kernel session. At this point, it's NOT supposed to be -1 but this is
1952 * an extra security check.
1954 if (session
->consumer_fd
< 0) {
1955 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1958 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1960 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1964 session
->consumer_fds_sent
= 1;
1972 * Create an UST session and add it to the session ust list.
1974 static int create_ust_session(struct ltt_session
*session
,
1975 struct lttng_domain
*domain
)
1977 struct ltt_ust_session
*lus
= NULL
;
1980 switch (domain
->type
) {
1981 case LTTNG_DOMAIN_UST
:
1984 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1988 DBG("Creating UST session");
1990 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1992 ret
= LTTCOMM_UST_SESS_FAIL
;
1996 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1997 session
->uid
, session
->gid
);
1999 if (ret
!= -EEXIST
) {
2000 ERR("Trace directory creation error");
2001 ret
= LTTCOMM_UST_SESS_FAIL
;
2006 /* The domain type dictate different actions on session creation */
2007 switch (domain
->type
) {
2008 case LTTNG_DOMAIN_UST
:
2009 /* No ustctl for the global UST domain */
2012 ERR("Unknown UST domain on create session %d", domain
->type
);
2015 lus
->uid
= session
->uid
;
2016 lus
->gid
= session
->gid
;
2017 session
->ust_session
= lus
;
2027 * Create a kernel tracer session then create the default channel.
2029 static int create_kernel_session(struct ltt_session
*session
)
2033 DBG("Creating kernel session");
2035 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2037 ret
= LTTCOMM_KERN_SESS_FAIL
;
2041 /* Set kernel consumer socket fd */
2042 if (kconsumer_data
.cmd_sock
>= 0) {
2043 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
2046 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
2047 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2049 if (ret
!= -EEXIST
) {
2050 ERR("Trace directory creation error");
2054 session
->kernel_session
->uid
= session
->uid
;
2055 session
->kernel_session
->gid
= session
->gid
;
2062 * Check if the UID or GID match the session. Root user has access to all
2065 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
2067 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
2074 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2077 struct ltt_session
*session
;
2079 DBG("Counting number of available session for UID %d GID %d",
2081 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2083 * Only list the sessions the user can control.
2085 if (!session_access_ok(session
, uid
, gid
)) {
2094 * Using the session list, filled a lttng_session array to send back to the
2095 * client for session listing.
2097 * The session list lock MUST be acquired before calling this function. Use
2098 * session_lock_list() and session_unlock_list().
2100 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2104 struct ltt_session
*session
;
2106 DBG("Getting all available session for UID %d GID %d",
2109 * Iterate over session list and append data after the control struct in
2112 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2114 * Only list the sessions the user can control.
2116 if (!session_access_ok(session
, uid
, gid
)) {
2119 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2120 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2121 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2122 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2123 sessions
[i
].enabled
= session
->enabled
;
2129 * Fill lttng_channel array of all channels.
2131 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2132 struct lttng_channel
*channels
)
2135 struct ltt_kernel_channel
*kchan
;
2137 DBG("Listing channels for session %s", session
->name
);
2140 case LTTNG_DOMAIN_KERNEL
:
2141 /* Kernel channels */
2142 if (session
->kernel_session
!= NULL
) {
2143 cds_list_for_each_entry(kchan
,
2144 &session
->kernel_session
->channel_list
.head
, list
) {
2145 /* Copy lttng_channel struct to array */
2146 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2147 channels
[i
].enabled
= kchan
->enabled
;
2152 case LTTNG_DOMAIN_UST
:
2154 struct lttng_ht_iter iter
;
2155 struct ltt_ust_channel
*uchan
;
2157 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2158 &iter
.iter
, uchan
, node
.node
) {
2159 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2160 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2161 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2162 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2163 channels
[i
].attr
.switch_timer_interval
=
2164 uchan
->attr
.switch_timer_interval
;
2165 channels
[i
].attr
.read_timer_interval
=
2166 uchan
->attr
.read_timer_interval
;
2167 channels
[i
].enabled
= uchan
->enabled
;
2168 switch (uchan
->attr
.output
) {
2169 case LTTNG_UST_MMAP
:
2171 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2184 * Create a list of ust global domain events.
2186 static int list_lttng_ust_global_events(char *channel_name
,
2187 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2190 unsigned int nb_event
= 0;
2191 struct lttng_ht_iter iter
;
2192 struct lttng_ht_node_str
*node
;
2193 struct ltt_ust_channel
*uchan
;
2194 struct ltt_ust_event
*uevent
;
2195 struct lttng_event
*tmp
;
2197 DBG("Listing UST global events for channel %s", channel_name
);
2201 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2202 node
= lttng_ht_iter_get_node_str(&iter
);
2204 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2208 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2210 nb_event
+= lttng_ht_get_count(uchan
->events
);
2212 if (nb_event
== 0) {
2217 DBG3("Listing UST global %d events", nb_event
);
2219 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2221 ret
= -LTTCOMM_FATAL
;
2225 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2226 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2227 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2228 tmp
[i
].enabled
= uevent
->enabled
;
2229 switch (uevent
->attr
.instrumentation
) {
2230 case LTTNG_UST_TRACEPOINT
:
2231 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2233 case LTTNG_UST_PROBE
:
2234 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2236 case LTTNG_UST_FUNCTION
:
2237 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2240 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
2241 switch (uevent
->attr
.loglevel_type
) {
2242 case LTTNG_UST_LOGLEVEL_ALL
:
2243 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2245 case LTTNG_UST_LOGLEVEL_RANGE
:
2246 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
2248 case LTTNG_UST_LOGLEVEL_SINGLE
:
2249 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
2264 * Fill lttng_event array of all kernel events in the channel.
2266 static int list_lttng_kernel_events(char *channel_name
,
2267 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2270 unsigned int nb_event
;
2271 struct ltt_kernel_event
*event
;
2272 struct ltt_kernel_channel
*kchan
;
2274 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2275 if (kchan
== NULL
) {
2276 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2280 nb_event
= kchan
->event_count
;
2282 DBG("Listing events for channel %s", kchan
->channel
->name
);
2284 if (nb_event
== 0) {
2289 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2290 if (*events
== NULL
) {
2291 ret
= LTTCOMM_FATAL
;
2295 /* Kernel channels */
2296 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2297 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2298 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2299 (*events
)[i
].enabled
= event
->enabled
;
2300 switch (event
->event
->instrumentation
) {
2301 case LTTNG_KERNEL_TRACEPOINT
:
2302 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2304 case LTTNG_KERNEL_KPROBE
:
2305 case LTTNG_KERNEL_KRETPROBE
:
2306 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2307 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2308 sizeof(struct lttng_kernel_kprobe
));
2310 case LTTNG_KERNEL_FUNCTION
:
2311 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2312 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2313 sizeof(struct lttng_kernel_function
));
2315 case LTTNG_KERNEL_NOOP
:
2316 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2318 case LTTNG_KERNEL_SYSCALL
:
2319 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2321 case LTTNG_KERNEL_ALL
:
2335 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2337 static int cmd_disable_channel(struct ltt_session
*session
,
2338 int domain
, char *channel_name
)
2341 struct ltt_ust_session
*usess
;
2343 usess
= session
->ust_session
;
2346 case LTTNG_DOMAIN_KERNEL
:
2348 ret
= channel_kernel_disable(session
->kernel_session
,
2350 if (ret
!= LTTCOMM_OK
) {
2354 kernel_wait_quiescent(kernel_tracer_fd
);
2357 case LTTNG_DOMAIN_UST
:
2359 struct ltt_ust_channel
*uchan
;
2360 struct lttng_ht
*chan_ht
;
2362 chan_ht
= usess
->domain_global
.channels
;
2364 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2365 if (uchan
== NULL
) {
2366 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2370 ret
= channel_ust_disable(usess
, domain
, uchan
);
2371 if (ret
!= LTTCOMM_OK
) {
2377 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2378 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2379 case LTTNG_DOMAIN_UST_PID
:
2382 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2393 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2395 static int cmd_enable_channel(struct ltt_session
*session
,
2396 int domain
, struct lttng_channel
*attr
)
2399 struct ltt_ust_session
*usess
= session
->ust_session
;
2400 struct lttng_ht
*chan_ht
;
2402 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2405 case LTTNG_DOMAIN_KERNEL
:
2407 struct ltt_kernel_channel
*kchan
;
2409 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2410 session
->kernel_session
);
2411 if (kchan
== NULL
) {
2412 ret
= channel_kernel_create(session
->kernel_session
,
2413 attr
, kernel_poll_pipe
[1]);
2415 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2418 if (ret
!= LTTCOMM_OK
) {
2422 kernel_wait_quiescent(kernel_tracer_fd
);
2425 case LTTNG_DOMAIN_UST
:
2427 struct ltt_ust_channel
*uchan
;
2429 chan_ht
= usess
->domain_global
.channels
;
2431 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2432 if (uchan
== NULL
) {
2433 ret
= channel_ust_create(usess
, domain
, attr
);
2435 ret
= channel_ust_enable(usess
, domain
, uchan
);
2440 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2441 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2442 case LTTNG_DOMAIN_UST_PID
:
2445 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2454 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2456 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2457 char *channel_name
, char *event_name
)
2462 case LTTNG_DOMAIN_KERNEL
:
2464 struct ltt_kernel_channel
*kchan
;
2465 struct ltt_kernel_session
*ksess
;
2467 ksess
= session
->kernel_session
;
2469 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2470 if (kchan
== NULL
) {
2471 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2475 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2476 if (ret
!= LTTCOMM_OK
) {
2480 kernel_wait_quiescent(kernel_tracer_fd
);
2483 case LTTNG_DOMAIN_UST
:
2485 struct ltt_ust_channel
*uchan
;
2486 struct ltt_ust_session
*usess
;
2488 usess
= session
->ust_session
;
2490 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2492 if (uchan
== NULL
) {
2493 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2497 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2498 if (ret
!= LTTCOMM_OK
) {
2502 DBG3("Disable UST event %s in channel %s completed", event_name
,
2507 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2508 case LTTNG_DOMAIN_UST_PID
:
2509 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2523 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2525 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2531 case LTTNG_DOMAIN_KERNEL
:
2533 struct ltt_kernel_session
*ksess
;
2534 struct ltt_kernel_channel
*kchan
;
2536 ksess
= session
->kernel_session
;
2538 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2539 if (kchan
== NULL
) {
2540 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2544 ret
= event_kernel_disable_all(ksess
, kchan
);
2545 if (ret
!= LTTCOMM_OK
) {
2549 kernel_wait_quiescent(kernel_tracer_fd
);
2552 case LTTNG_DOMAIN_UST
:
2554 struct ltt_ust_session
*usess
;
2555 struct ltt_ust_channel
*uchan
;
2557 usess
= session
->ust_session
;
2559 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2561 if (uchan
== NULL
) {
2562 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2566 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2571 DBG3("Disable all UST events in channel %s completed", channel_name
);
2576 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2577 case LTTNG_DOMAIN_UST_PID
:
2578 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2592 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2594 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2595 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2600 case LTTNG_DOMAIN_KERNEL
:
2601 /* Add kernel context to kernel tracer */
2602 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2603 event_name
, channel_name
);
2604 if (ret
!= LTTCOMM_OK
) {
2608 case LTTNG_DOMAIN_UST
:
2610 struct ltt_ust_session
*usess
= session
->ust_session
;
2612 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2613 if (ret
!= LTTCOMM_OK
) {
2619 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2620 case LTTNG_DOMAIN_UST_PID
:
2621 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2635 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2637 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2638 char *channel_name
, struct lttng_event
*event
)
2641 struct lttng_channel
*attr
;
2642 struct ltt_ust_session
*usess
= session
->ust_session
;
2645 case LTTNG_DOMAIN_KERNEL
:
2647 struct ltt_kernel_channel
*kchan
;
2649 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2650 session
->kernel_session
);
2651 if (kchan
== NULL
) {
2652 attr
= channel_new_default_attr(domain
);
2654 ret
= LTTCOMM_FATAL
;
2657 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2659 /* This call will notify the kernel thread */
2660 ret
= channel_kernel_create(session
->kernel_session
,
2661 attr
, kernel_poll_pipe
[1]);
2662 if (ret
!= LTTCOMM_OK
) {
2669 /* Get the newly created kernel channel pointer */
2670 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2671 session
->kernel_session
);
2672 if (kchan
== NULL
) {
2673 /* This sould not happen... */
2674 ret
= LTTCOMM_FATAL
;
2678 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2680 if (ret
!= LTTCOMM_OK
) {
2684 kernel_wait_quiescent(kernel_tracer_fd
);
2687 case LTTNG_DOMAIN_UST
:
2689 struct lttng_channel
*attr
;
2690 struct ltt_ust_channel
*uchan
;
2692 /* Get channel from global UST domain */
2693 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2695 if (uchan
== NULL
) {
2696 /* Create default channel */
2697 attr
= channel_new_default_attr(domain
);
2699 ret
= LTTCOMM_FATAL
;
2702 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2703 attr
->name
[NAME_MAX
- 1] = '\0';
2705 ret
= channel_ust_create(usess
, domain
, attr
);
2706 if (ret
!= LTTCOMM_OK
) {
2712 /* Get the newly created channel reference back */
2713 uchan
= trace_ust_find_channel_by_name(
2714 usess
->domain_global
.channels
, channel_name
);
2715 if (uchan
== NULL
) {
2716 /* Something is really wrong */
2717 ret
= LTTCOMM_FATAL
;
2722 /* At this point, the session and channel exist on the tracer */
2723 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2724 if (ret
!= LTTCOMM_OK
) {
2730 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2731 case LTTNG_DOMAIN_UST_PID
:
2732 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2746 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2748 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2749 char *channel_name
, int event_type
)
2752 struct ltt_kernel_channel
*kchan
;
2755 case LTTNG_DOMAIN_KERNEL
:
2756 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2757 session
->kernel_session
);
2758 if (kchan
== NULL
) {
2759 /* This call will notify the kernel thread */
2760 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2761 kernel_poll_pipe
[1]);
2762 if (ret
!= LTTCOMM_OK
) {
2766 /* Get the newly created kernel channel pointer */
2767 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2768 session
->kernel_session
);
2769 if (kchan
== NULL
) {
2770 /* This sould not happen... */
2771 ret
= LTTCOMM_FATAL
;
2777 switch (event_type
) {
2778 case LTTNG_EVENT_SYSCALL
:
2779 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2780 kchan
, kernel_tracer_fd
);
2782 case LTTNG_EVENT_TRACEPOINT
:
2784 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2785 * events already registered to the channel.
2787 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2788 kchan
, kernel_tracer_fd
);
2790 case LTTNG_EVENT_ALL
:
2791 /* Enable syscalls and tracepoints */
2792 ret
= event_kernel_enable_all(session
->kernel_session
,
2793 kchan
, kernel_tracer_fd
);
2796 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2800 /* Manage return value */
2801 if (ret
!= LTTCOMM_OK
) {
2805 kernel_wait_quiescent(kernel_tracer_fd
);
2807 case LTTNG_DOMAIN_UST
:
2809 struct lttng_channel
*attr
;
2810 struct ltt_ust_channel
*uchan
;
2811 struct ltt_ust_session
*usess
= session
->ust_session
;
2813 /* Get channel from global UST domain */
2814 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2816 if (uchan
== NULL
) {
2817 /* Create default channel */
2818 attr
= channel_new_default_attr(domain
);
2820 ret
= LTTCOMM_FATAL
;
2823 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2824 attr
->name
[NAME_MAX
- 1] = '\0';
2826 /* Use the internal command enable channel */
2827 ret
= channel_ust_create(usess
, domain
, attr
);
2828 if (ret
!= LTTCOMM_OK
) {
2834 /* Get the newly created channel reference back */
2835 uchan
= trace_ust_find_channel_by_name(
2836 usess
->domain_global
.channels
, channel_name
);
2837 if (uchan
== NULL
) {
2838 /* Something is really wrong */
2839 ret
= LTTCOMM_FATAL
;
2844 /* At this point, the session and channel exist on the tracer */
2846 switch (event_type
) {
2847 case LTTNG_EVENT_ALL
:
2848 case LTTNG_EVENT_TRACEPOINT
:
2849 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2850 if (ret
!= LTTCOMM_OK
) {
2855 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2859 /* Manage return value */
2860 if (ret
!= LTTCOMM_OK
) {
2867 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2868 case LTTNG_DOMAIN_UST_PID
:
2869 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2883 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2885 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2888 ssize_t nb_events
= 0;
2891 case LTTNG_DOMAIN_KERNEL
:
2892 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2893 if (nb_events
< 0) {
2894 ret
= LTTCOMM_KERN_LIST_FAIL
;
2898 case LTTNG_DOMAIN_UST
:
2899 nb_events
= ust_app_list_events(events
);
2900 if (nb_events
< 0) {
2901 ret
= LTTCOMM_UST_LIST_FAIL
;
2913 /* Return negative value to differentiate return code */
2918 * Command LTTNG_START_TRACE processed by the client thread.
2920 static int cmd_start_trace(struct ltt_session
*session
)
2923 struct ltt_kernel_session
*ksession
;
2924 struct ltt_ust_session
*usess
;
2927 ksession
= session
->kernel_session
;
2928 usess
= session
->ust_session
;
2930 if (session
->enabled
) {
2931 /* Already started. */
2932 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2936 session
->enabled
= 1;
2938 /* Kernel tracing */
2939 if (ksession
!= NULL
) {
2940 struct ltt_kernel_channel
*kchan
;
2942 /* Open kernel metadata */
2943 if (ksession
->metadata
== NULL
) {
2944 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2946 ret
= LTTCOMM_KERN_META_FAIL
;
2951 /* Open kernel metadata stream */
2952 if (ksession
->metadata_stream_fd
< 0) {
2953 ret
= kernel_open_metadata_stream(ksession
);
2955 ERR("Kernel create metadata stream failed");
2956 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2961 /* For each channel */
2962 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2963 if (kchan
->stream_count
== 0) {
2964 ret
= kernel_open_channel_stream(kchan
);
2966 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2969 /* Update the stream global counter */
2970 ksession
->stream_count_global
+= ret
;
2974 /* Setup kernel consumer socket and send fds to it */
2975 ret
= init_kernel_tracing(ksession
);
2977 ret
= LTTCOMM_KERN_START_FAIL
;
2981 /* This start the kernel tracing */
2982 ret
= kernel_start_session(ksession
);
2984 ret
= LTTCOMM_KERN_START_FAIL
;
2988 /* Quiescent wait after starting trace */
2989 kernel_wait_quiescent(kernel_tracer_fd
);
2992 /* Flag session that trace should start automatically */
2994 usess
->start_trace
= 1;
2996 ret
= ust_app_start_trace_all(usess
);
2998 ret
= LTTCOMM_UST_START_FAIL
;
3010 * Command LTTNG_STOP_TRACE processed by the client thread.
3012 static int cmd_stop_trace(struct ltt_session
*session
)
3015 struct ltt_kernel_channel
*kchan
;
3016 struct ltt_kernel_session
*ksession
;
3017 struct ltt_ust_session
*usess
;
3020 ksession
= session
->kernel_session
;
3021 usess
= session
->ust_session
;
3023 if (!session
->enabled
) {
3024 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
3028 session
->enabled
= 0;
3031 if (ksession
!= NULL
) {
3032 DBG("Stop kernel tracing");
3034 /* Flush all buffers before stopping */
3035 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
3037 ERR("Kernel metadata flush failed");
3040 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
3041 ret
= kernel_flush_buffer(kchan
);
3043 ERR("Kernel flush buffer error");
3047 ret
= kernel_stop_session(ksession
);
3049 ret
= LTTCOMM_KERN_STOP_FAIL
;
3053 kernel_wait_quiescent(kernel_tracer_fd
);
3057 usess
->start_trace
= 0;
3059 ret
= ust_app_stop_trace_all(usess
);
3061 ret
= LTTCOMM_UST_STOP_FAIL
;
3073 * Command LTTNG_CREATE_SESSION processed by the client thread.
3075 static int cmd_create_session(char *name
, char *path
, lttng_sock_cred
*creds
)
3079 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
3080 LTTNG_SOCK_GET_GID_CRED(creds
));
3081 if (ret
!= LTTCOMM_OK
) {
3092 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3094 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3098 /* Clean kernel session teardown */
3099 teardown_kernel_session(session
);
3100 /* UST session teardown */
3101 teardown_ust_session(session
);
3104 * Must notify the kernel thread here to update it's poll setin order
3105 * to remove the channel(s)' fd just destroyed.
3107 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3109 PERROR("write kernel poll pipe");
3112 ret
= session_destroy(session
);
3118 * Command LTTNG_CALIBRATE processed by the client thread.
3120 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3125 case LTTNG_DOMAIN_KERNEL
:
3127 struct lttng_kernel_calibrate kcalibrate
;
3129 kcalibrate
.type
= calibrate
->type
;
3130 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3132 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3137 case LTTNG_DOMAIN_UST
:
3139 struct lttng_ust_calibrate ucalibrate
;
3141 ucalibrate
.type
= calibrate
->type
;
3142 ret
= ust_app_calibrate_glb(&ucalibrate
);
3144 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
3161 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3163 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3169 case LTTNG_DOMAIN_KERNEL
:
3170 /* Can't register a consumer if there is already one */
3171 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3172 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3176 sock
= lttcomm_connect_unix_sock(sock_path
);
3178 ret
= LTTCOMM_CONNECT_FAIL
;
3182 session
->kernel_session
->consumer_fd
= sock
;
3185 /* TODO: Userspace tracing */
3197 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3199 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3200 struct lttng_domain
**domains
)
3205 if (session
->kernel_session
!= NULL
) {
3206 DBG3("Listing domains found kernel domain");
3210 if (session
->ust_session
!= NULL
) {
3211 DBG3("Listing domains found UST global domain");
3215 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3216 if (*domains
== NULL
) {
3217 ret
= -LTTCOMM_FATAL
;
3221 if (session
->kernel_session
!= NULL
) {
3222 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3226 if (session
->ust_session
!= NULL
) {
3227 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3238 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3240 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3241 struct lttng_channel
**channels
)
3244 ssize_t nb_chan
= 0;
3247 case LTTNG_DOMAIN_KERNEL
:
3248 if (session
->kernel_session
!= NULL
) {
3249 nb_chan
= session
->kernel_session
->channel_count
;
3251 DBG3("Number of kernel channels %zd", nb_chan
);
3253 case LTTNG_DOMAIN_UST
:
3254 if (session
->ust_session
!= NULL
) {
3255 nb_chan
= lttng_ht_get_count(
3256 session
->ust_session
->domain_global
.channels
);
3258 DBG3("Number of UST global channels %zd", nb_chan
);
3267 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3268 if (*channels
== NULL
) {
3269 ret
= -LTTCOMM_FATAL
;
3273 list_lttng_channels(domain
, session
, *channels
);
3285 * Command LTTNG_LIST_EVENTS processed by the client thread.
3287 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3288 char *channel_name
, struct lttng_event
**events
)
3291 ssize_t nb_event
= 0;
3294 case LTTNG_DOMAIN_KERNEL
:
3295 if (session
->kernel_session
!= NULL
) {
3296 nb_event
= list_lttng_kernel_events(channel_name
,
3297 session
->kernel_session
, events
);
3300 case LTTNG_DOMAIN_UST
:
3302 if (session
->ust_session
!= NULL
) {
3303 nb_event
= list_lttng_ust_global_events(channel_name
,
3304 &session
->ust_session
->domain_global
, events
);
3320 * Process the command requested by the lttng client within the command
3321 * context structure. This function make sure that the return structure (llm)
3322 * is set and ready for transmission before returning.
3324 * Return any error encountered or 0 for success.
3326 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3328 int ret
= LTTCOMM_OK
;
3329 int need_tracing_session
= 1;
3332 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3334 switch (cmd_ctx
->lsm
->cmd_type
) {
3335 case LTTNG_CREATE_SESSION
:
3336 case LTTNG_DESTROY_SESSION
:
3337 case LTTNG_LIST_SESSIONS
:
3338 case LTTNG_LIST_DOMAINS
:
3339 case LTTNG_START_TRACE
:
3340 case LTTNG_STOP_TRACE
:
3347 if (opt_no_kernel
&& need_domain
3348 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3350 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3352 ret
= LTTCOMM_KERN_NA
;
3358 * Check for command that don't needs to allocate a returned payload. We do
3359 * this here so we don't have to make the call for no payload at each
3362 switch(cmd_ctx
->lsm
->cmd_type
) {
3363 case LTTNG_LIST_SESSIONS
:
3364 case LTTNG_LIST_TRACEPOINTS
:
3365 case LTTNG_LIST_DOMAINS
:
3366 case LTTNG_LIST_CHANNELS
:
3367 case LTTNG_LIST_EVENTS
:
3370 /* Setup lttng message with no payload */
3371 ret
= setup_lttng_msg(cmd_ctx
, 0);
3373 /* This label does not try to unlock the session */
3374 goto init_setup_error
;
3378 /* Commands that DO NOT need a session. */
3379 switch (cmd_ctx
->lsm
->cmd_type
) {
3380 case LTTNG_CREATE_SESSION
:
3381 case LTTNG_CALIBRATE
:
3382 case LTTNG_LIST_SESSIONS
:
3383 case LTTNG_LIST_TRACEPOINTS
:
3384 need_tracing_session
= 0;
3387 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3389 * We keep the session list lock across _all_ commands
3390 * for now, because the per-session lock does not
3391 * handle teardown properly.
3393 session_lock_list();
3394 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3395 if (cmd_ctx
->session
== NULL
) {
3396 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3397 ret
= LTTCOMM_SESS_NOT_FOUND
;
3399 /* If no session name specified */
3400 ret
= LTTCOMM_SELECT_SESS
;
3404 /* Acquire lock for the session */
3405 session_lock(cmd_ctx
->session
);
3414 * Check domain type for specific "pre-action".
3416 switch (cmd_ctx
->lsm
->domain
.type
) {
3417 case LTTNG_DOMAIN_KERNEL
:
3419 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3423 /* Kernel tracer check */
3424 if (kernel_tracer_fd
== -1) {
3425 /* Basically, load kernel tracer modules */
3426 ret
= init_kernel_tracer();
3432 /* Need a session for kernel command */
3433 if (need_tracing_session
) {
3434 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3435 ret
= create_kernel_session(cmd_ctx
->session
);
3437 ret
= LTTCOMM_KERN_SESS_FAIL
;
3442 /* Start the kernel consumer daemon */
3443 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3444 if (kconsumer_data
.pid
== 0 &&
3445 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3446 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3447 ret
= start_consumerd(&kconsumer_data
);
3449 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3453 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3457 case LTTNG_DOMAIN_UST
:
3459 if (need_tracing_session
) {
3460 if (cmd_ctx
->session
->ust_session
== NULL
) {
3461 ret
= create_ust_session(cmd_ctx
->session
,
3462 &cmd_ctx
->lsm
->domain
);
3463 if (ret
!= LTTCOMM_OK
) {
3467 /* Start the UST consumer daemons */
3469 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3470 if (consumerd64_bin
[0] != '\0' &&
3471 ustconsumer64_data
.pid
== 0 &&
3472 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3473 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3474 ret
= start_consumerd(&ustconsumer64_data
);
3476 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3477 ust_consumerd64_fd
= -EINVAL
;
3481 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3483 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3486 if (consumerd32_bin
[0] != '\0' &&
3487 ustconsumer32_data
.pid
== 0 &&
3488 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3489 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3490 ret
= start_consumerd(&ustconsumer32_data
);
3492 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3493 ust_consumerd32_fd
= -EINVAL
;
3496 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3498 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3509 * Check that the UID or GID match that of the tracing session.
3510 * The root user can interact with all sessions.
3512 if (need_tracing_session
) {
3513 if (!session_access_ok(cmd_ctx
->session
,
3514 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3515 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3516 ret
= LTTCOMM_EPERM
;
3521 /* Process by command type */
3522 switch (cmd_ctx
->lsm
->cmd_type
) {
3523 case LTTNG_ADD_CONTEXT
:
3525 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3526 cmd_ctx
->lsm
->u
.context
.channel_name
,
3527 cmd_ctx
->lsm
->u
.context
.event_name
,
3528 &cmd_ctx
->lsm
->u
.context
.ctx
);
3531 case LTTNG_DISABLE_CHANNEL
:
3533 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3534 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3537 case LTTNG_DISABLE_EVENT
:
3539 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3540 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3541 cmd_ctx
->lsm
->u
.disable
.name
);
3544 case LTTNG_DISABLE_ALL_EVENT
:
3546 DBG("Disabling all events");
3548 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3549 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3552 case LTTNG_ENABLE_CHANNEL
:
3554 tracepoint(enable_ust_channel_start
);
3555 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3556 &cmd_ctx
->lsm
->u
.channel
.chan
);
3557 tracepoint(enable_ust_channel_end
);
3558 bench_print_enable_ust_channel();
3561 case LTTNG_ENABLE_EVENT
:
3563 tracepoint(enable_ust_event_start
);
3564 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3565 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3566 &cmd_ctx
->lsm
->u
.enable
.event
);
3567 tracepoint(enable_ust_event_end
);
3570 case LTTNG_ENABLE_ALL_EVENT
:
3572 DBG("Enabling all events");
3574 tracepoint(enable_ust_event_start
);
3575 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3576 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3577 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3578 tracepoint(enable_ust_event_end
);
3581 case LTTNG_LIST_TRACEPOINTS
:
3583 struct lttng_event
*events
;
3586 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3587 if (nb_events
< 0) {
3593 * Setup lttng message with payload size set to the event list size in
3594 * bytes and then copy list into the llm payload.
3596 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3602 /* Copy event list into message payload */
3603 memcpy(cmd_ctx
->llm
->payload
, events
,
3604 sizeof(struct lttng_event
) * nb_events
);
3611 case LTTNG_START_TRACE
:
3613 tracepoint(start_ust_start
);
3614 ret
= cmd_start_trace(cmd_ctx
->session
);
3615 tracepoint(start_ust_end
);
3616 bench_print_start_ust();
3619 case LTTNG_STOP_TRACE
:
3621 ret
= cmd_stop_trace(cmd_ctx
->session
);
3624 case LTTNG_CREATE_SESSION
:
3626 tracepoint(create_session_start
);
3627 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3628 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3629 tracepoint(create_session_end
);
3630 bench_print_create_session();
3633 case LTTNG_DESTROY_SESSION
:
3635 tracepoint(destroy_session_start
);
3636 ret
= cmd_destroy_session(cmd_ctx
->session
,
3637 cmd_ctx
->lsm
->session
.name
);
3638 tracepoint(destroy_session_end
);
3640 * Set session to NULL so we do not unlock it after
3643 cmd_ctx
->session
= NULL
;
3646 case LTTNG_LIST_DOMAINS
:
3649 struct lttng_domain
*domains
;
3651 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3657 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3662 /* Copy event list into message payload */
3663 memcpy(cmd_ctx
->llm
->payload
, domains
,
3664 nb_dom
* sizeof(struct lttng_domain
));
3671 case LTTNG_LIST_CHANNELS
:
3674 struct lttng_channel
*channels
;
3676 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3677 cmd_ctx
->session
, &channels
);
3683 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3688 /* Copy event list into message payload */
3689 memcpy(cmd_ctx
->llm
->payload
, channels
,
3690 nb_chan
* sizeof(struct lttng_channel
));
3697 case LTTNG_LIST_EVENTS
:
3700 struct lttng_event
*events
= NULL
;
3702 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3703 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3709 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3714 /* Copy event list into message payload */
3715 memcpy(cmd_ctx
->llm
->payload
, events
,
3716 nb_event
* sizeof(struct lttng_event
));
3723 case LTTNG_LIST_SESSIONS
:
3725 unsigned int nr_sessions
;
3727 session_lock_list();
3728 nr_sessions
= lttng_sessions_count(
3729 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3730 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3732 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3734 session_unlock_list();
3738 /* Filled the session array */
3739 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3740 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3741 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3743 session_unlock_list();
3748 case LTTNG_CALIBRATE
:
3750 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3751 &cmd_ctx
->lsm
->u
.calibrate
);
3754 case LTTNG_REGISTER_CONSUMER
:
3756 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3757 cmd_ctx
->lsm
->u
.reg
.path
);
3766 if (cmd_ctx
->llm
== NULL
) {
3767 DBG("Missing llm structure. Allocating one.");
3768 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3772 /* Set return code */
3773 cmd_ctx
->llm
->ret_code
= ret
;
3775 if (cmd_ctx
->session
) {
3776 session_unlock(cmd_ctx
->session
);
3778 if (need_tracing_session
) {
3779 session_unlock_list();
3786 * This thread manage all clients request using the unix client socket for
3789 static void *thread_manage_clients(void *data
)
3791 int sock
= -1, ret
, i
, pollfd
;
3792 uint32_t revents
, nb_fd
;
3793 struct command_ctx
*cmd_ctx
= NULL
;
3794 struct lttng_poll_event events
;
3796 tracepoint(sessiond_th_cli_start
);
3798 DBG("[thread] Manage client started");
3800 rcu_register_thread();
3802 ret
= lttcomm_listen_unix_sock(client_sock
);
3808 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3809 * more will be added to this poll set.
3811 ret
= create_thread_poll_set(&events
, 2);
3816 /* Add the application registration socket */
3817 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3823 * Notify parent pid that we are ready to accept command for client side.
3825 if (opt_sig_parent
) {
3826 kill(ppid
, SIGUSR1
);
3830 DBG("Accepting client command ...");
3832 tracepoint(sessiond_th_cli_poll
);
3834 nb_fd
= LTTNG_POLL_GETNB(&events
);
3836 /* Inifinite blocking call, waiting for transmission */
3838 ret
= lttng_poll_wait(&events
, -1);
3841 * Restart interrupted system call.
3843 if (errno
== EINTR
) {
3849 for (i
= 0; i
< nb_fd
; i
++) {
3850 /* Fetch once the poll data */
3851 revents
= LTTNG_POLL_GETEV(&events
, i
);
3852 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3854 /* Thread quit pipe has been closed. Killing thread. */
3855 ret
= check_thread_quit_pipe(pollfd
, revents
);
3860 /* Event on the registration socket */
3861 if (pollfd
== client_sock
) {
3862 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3863 ERR("Client socket poll error");
3869 DBG("Wait for client response");
3871 sock
= lttcomm_accept_unix_sock(client_sock
);
3876 /* Set socket option for credentials retrieval */
3877 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3882 /* Allocate context command to process the client request */
3883 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3884 if (cmd_ctx
== NULL
) {
3885 PERROR("zmalloc cmd_ctx");
3889 /* Allocate data buffer for reception */
3890 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3891 if (cmd_ctx
->lsm
== NULL
) {
3892 PERROR("zmalloc cmd_ctx->lsm");
3896 cmd_ctx
->llm
= NULL
;
3897 cmd_ctx
->session
= NULL
;
3900 * Data is received from the lttng client. The struct
3901 * lttcomm_session_msg (lsm) contains the command and data request of
3904 DBG("Receiving data from client ...");
3905 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3906 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3908 DBG("Nothing recv() from client... continuing");
3914 clean_command_ctx(&cmd_ctx
);
3918 // TODO: Validate cmd_ctx including sanity check for
3919 // security purpose.
3921 rcu_thread_online();
3923 * This function dispatch the work to the kernel or userspace tracer
3924 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3925 * informations for the client. The command context struct contains
3926 * everything this function may needs.
3928 ret
= process_client_msg(cmd_ctx
);
3929 rcu_thread_offline();
3932 * TODO: Inform client somehow of the fatal error. At
3933 * this point, ret < 0 means that a zmalloc failed
3934 * (ENOMEM). Error detected but still accept command.
3936 clean_command_ctx(&cmd_ctx
);
3940 DBG("Sending response (size: %d, retcode: %s)",
3941 cmd_ctx
->lttng_msg_size
,
3942 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3943 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3945 ERR("Failed to send data back to client");
3948 /* End of transmission */
3955 clean_command_ctx(&cmd_ctx
);
3959 DBG("Client thread dying");
3960 unlink(client_unix_sock_path
);
3961 if (client_sock
>= 0) {
3962 ret
= close(client_sock
);
3974 lttng_poll_clean(&events
);
3975 clean_command_ctx(&cmd_ctx
);
3977 rcu_unregister_thread();
3983 * usage function on stderr
3985 static void usage(void)
3987 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3988 fprintf(stderr
, " -h, --help Display this usage.\n");
3989 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3990 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3991 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3992 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3993 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3994 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3995 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3996 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3997 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3998 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3999 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4000 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
4001 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
4002 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4003 fprintf(stderr
, " -V, --version Show version number.\n");
4004 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
4005 fprintf(stderr
, " -q, --quiet No output at all.\n");
4006 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
4007 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4008 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
4012 * daemon argument parsing
4014 static int parse_args(int argc
, char **argv
)
4018 static struct option long_options
[] = {
4019 { "client-sock", 1, 0, 'c' },
4020 { "apps-sock", 1, 0, 'a' },
4021 { "kconsumerd-cmd-sock", 1, 0, 'C' },
4022 { "kconsumerd-err-sock", 1, 0, 'E' },
4023 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
4024 { "ustconsumerd32-err-sock", 1, 0, 'H' },
4025 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
4026 { "ustconsumerd64-err-sock", 1, 0, 'F' },
4027 { "consumerd32-path", 1, 0, 'u' },
4028 { "consumerd32-libdir", 1, 0, 'U' },
4029 { "consumerd64-path", 1, 0, 't' },
4030 { "consumerd64-libdir", 1, 0, 'T' },
4031 { "daemonize", 0, 0, 'd' },
4032 { "sig-parent", 0, 0, 'S' },
4033 { "help", 0, 0, 'h' },
4034 { "group", 1, 0, 'g' },
4035 { "version", 0, 0, 'V' },
4036 { "quiet", 0, 0, 'q' },
4037 { "verbose", 0, 0, 'v' },
4038 { "verbose-consumer", 0, 0, 'Z' },
4039 { "no-kernel", 0, 0, 'N' },
4044 int option_index
= 0;
4045 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
4046 long_options
, &option_index
);
4053 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
4055 fprintf(stderr
, " with arg %s\n", optarg
);
4059 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4062 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4068 opt_tracing_group
= optarg
;
4074 fprintf(stdout
, "%s\n", VERSION
);
4080 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4083 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4086 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4089 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4092 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4095 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4101 lttng_opt_quiet
= 1;
4104 /* Verbose level can increase using multiple -v */
4105 lttng_opt_verbose
+= 1;
4108 opt_verbose_consumer
+= 1;
4111 consumerd32_bin
= optarg
;
4114 consumerd32_libdir
= optarg
;
4117 consumerd64_bin
= optarg
;
4120 consumerd64_libdir
= optarg
;
4123 /* Unknown option or other error.
4124 * Error is printed by getopt, just return */
4133 * Creates the two needed socket by the daemon.
4134 * apps_sock - The communication socket for all UST apps.
4135 * client_sock - The communication of the cli tool (lttng).
4137 static int init_daemon_socket(void)
4142 old_umask
= umask(0);
4144 /* Create client tool unix socket */
4145 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4146 if (client_sock
< 0) {
4147 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4152 /* File permission MUST be 660 */
4153 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4155 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4160 /* Create the application unix socket */
4161 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4162 if (apps_sock
< 0) {
4163 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4168 /* File permission MUST be 666 */
4169 ret
= chmod(apps_unix_sock_path
,
4170 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4172 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4183 * Check if the global socket is available, and if a daemon is answering at the
4184 * other side. If yes, error is returned.
4186 static int check_existing_daemon(void)
4188 /* Is there anybody out there ? */
4189 if (lttng_session_daemon_alive()) {
4197 * Set the tracing group gid onto the client socket.
4199 * Race window between mkdir and chown is OK because we are going from more
4200 * permissive (root.root) to less permissive (root.tracing).
4202 static int set_permissions(char *rundir
)
4207 gid
= allowed_group();
4209 WARN("No tracing group detected");
4214 /* Set lttng run dir */
4215 ret
= chown(rundir
, 0, gid
);
4217 ERR("Unable to set group on %s", rundir
);
4221 /* Ensure tracing group can search the run dir */
4222 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4224 ERR("Unable to set permissions on %s", rundir
);
4228 /* lttng client socket path */
4229 ret
= chown(client_unix_sock_path
, 0, gid
);
4231 ERR("Unable to set group on %s", client_unix_sock_path
);
4235 /* kconsumer error socket path */
4236 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4238 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4242 /* 64-bit ustconsumer error socket path */
4243 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4245 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4249 /* 32-bit ustconsumer compat32 error socket path */
4250 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4252 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4256 DBG("All permissions are set");
4263 * Create the pipe used to wake up the kernel thread.
4264 * Closed in cleanup().
4266 static int create_kernel_poll_pipe(void)
4270 ret
= pipe(kernel_poll_pipe
);
4272 PERROR("kernel poll pipe");
4276 for (i
= 0; i
< 2; i
++) {
4277 ret
= fcntl(kernel_poll_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4279 PERROR("fcntl kernel_poll_pipe");
4289 * Create the application command pipe to wake thread_manage_apps.
4290 * Closed in cleanup().
4292 static int create_apps_cmd_pipe(void)
4296 ret
= pipe(apps_cmd_pipe
);
4298 PERROR("apps cmd pipe");
4302 for (i
= 0; i
< 2; i
++) {
4303 ret
= fcntl(apps_cmd_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4305 PERROR("fcntl apps_cmd_pipe");
4315 * Create the lttng run directory needed for all global sockets and pipe.
4317 static int create_lttng_rundir(const char *rundir
)
4321 DBG3("Creating LTTng run directory: %s", rundir
);
4323 ret
= mkdir(rundir
, S_IRWXU
);
4325 if (errno
!= EEXIST
) {
4326 ERR("Unable to create %s", rundir
);
4338 * Setup sockets and directory needed by the kconsumerd communication with the
4341 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4345 char path
[PATH_MAX
];
4347 switch (consumer_data
->type
) {
4348 case LTTNG_CONSUMER_KERNEL
:
4349 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4351 case LTTNG_CONSUMER64_UST
:
4352 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4354 case LTTNG_CONSUMER32_UST
:
4355 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4358 ERR("Consumer type unknown");
4363 DBG2("Creating consumer directory: %s", path
);
4365 ret
= mkdir(path
, S_IRWXU
);
4367 if (errno
!= EEXIST
) {
4369 ERR("Failed to create %s", path
);
4375 /* Create the kconsumerd error unix socket */
4376 consumer_data
->err_sock
=
4377 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4378 if (consumer_data
->err_sock
< 0) {
4379 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4384 /* File permission MUST be 660 */
4385 ret
= chmod(consumer_data
->err_unix_sock_path
,
4386 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4388 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4398 * Signal handler for the daemon
4400 * Simply stop all worker threads, leaving main() return gracefully after
4401 * joining all threads and calling cleanup().
4403 static void sighandler(int sig
)
4407 DBG("SIGPIPE caught");
4410 DBG("SIGINT caught");
4414 DBG("SIGTERM caught");
4423 * Setup signal handler for :
4424 * SIGINT, SIGTERM, SIGPIPE
4426 static int set_signal_handler(void)
4429 struct sigaction sa
;
4432 if ((ret
= sigemptyset(&sigset
)) < 0) {
4433 PERROR("sigemptyset");
4437 sa
.sa_handler
= sighandler
;
4438 sa
.sa_mask
= sigset
;
4440 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4441 PERROR("sigaction");
4445 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4446 PERROR("sigaction");
4450 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4451 PERROR("sigaction");
4455 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4461 * Set open files limit to unlimited. This daemon can open a large number of
4462 * file descriptors in order to consumer multiple kernel traces.
4464 static void set_ulimit(void)
4469 /* The kernel does not allowed an infinite limit for open files */
4470 lim
.rlim_cur
= 65535;
4471 lim
.rlim_max
= 65535;
4473 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4475 PERROR("failed to set open files limit");
4482 int main(int argc
, char **argv
)
4486 const char *home_path
;
4488 tracepoint(sessiond_boot_start
);
4490 init_kernel_workarounds();
4492 rcu_register_thread();
4494 /* Create thread quit pipe */
4495 if ((ret
= init_thread_quit_pipe()) < 0) {
4499 setup_consumerd_path();
4501 /* Parse arguments */
4503 if ((ret
= parse_args(argc
, argv
) < 0)) {
4516 /* Check if daemon is UID = 0 */
4517 is_root
= !getuid();
4520 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4522 /* Create global run dir with root access */
4523 ret
= create_lttng_rundir(rundir
);
4528 if (strlen(apps_unix_sock_path
) == 0) {
4529 snprintf(apps_unix_sock_path
, PATH_MAX
,
4530 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4533 if (strlen(client_unix_sock_path
) == 0) {
4534 snprintf(client_unix_sock_path
, PATH_MAX
,
4535 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4538 /* Set global SHM for ust */
4539 if (strlen(wait_shm_path
) == 0) {
4540 snprintf(wait_shm_path
, PATH_MAX
,
4541 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4544 /* Setup kernel consumerd path */
4545 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4546 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4547 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4548 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4550 DBG2("Kernel consumer err path: %s",
4551 kconsumer_data
.err_unix_sock_path
);
4552 DBG2("Kernel consumer cmd path: %s",
4553 kconsumer_data
.cmd_unix_sock_path
);
4555 home_path
= get_home_dir();
4556 if (home_path
== NULL
) {
4557 /* TODO: Add --socket PATH option */
4558 ERR("Can't get HOME directory for sockets creation.");
4564 * Create rundir from home path. This will create something like
4567 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4573 ret
= create_lttng_rundir(rundir
);
4578 if (strlen(apps_unix_sock_path
) == 0) {
4579 snprintf(apps_unix_sock_path
, PATH_MAX
,
4580 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4583 /* Set the cli tool unix socket path */
4584 if (strlen(client_unix_sock_path
) == 0) {
4585 snprintf(client_unix_sock_path
, PATH_MAX
,
4586 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4589 /* Set global SHM for ust */
4590 if (strlen(wait_shm_path
) == 0) {
4591 snprintf(wait_shm_path
, PATH_MAX
,
4592 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4596 DBG("Client socket path %s", client_unix_sock_path
);
4597 DBG("Application socket path %s", apps_unix_sock_path
);
4598 DBG("LTTng run directory path: %s", rundir
);
4600 /* 32 bits consumerd path setup */
4601 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4602 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4603 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4604 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4606 DBG2("UST consumer 32 bits err path: %s",
4607 ustconsumer32_data
.err_unix_sock_path
);
4608 DBG2("UST consumer 32 bits cmd path: %s",
4609 ustconsumer32_data
.cmd_unix_sock_path
);
4611 /* 64 bits consumerd path setup */
4612 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4613 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4614 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4615 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4617 DBG2("UST consumer 64 bits err path: %s",
4618 ustconsumer64_data
.err_unix_sock_path
);
4619 DBG2("UST consumer 64 bits cmd path: %s",
4620 ustconsumer64_data
.cmd_unix_sock_path
);
4623 * See if daemon already exist.
4625 if ((ret
= check_existing_daemon()) < 0) {
4626 ERR("Already running daemon.\n");
4628 * We do not goto exit because we must not cleanup()
4629 * because a daemon is already running.
4635 * Init UST app hash table. Alloc hash table before this point since
4636 * cleanup() can get called after that point.
4640 /* After this point, we can safely call cleanup() with "goto exit" */
4643 * These actions must be executed as root. We do that *after* setting up
4644 * the sockets path because we MUST make the check for another daemon using
4645 * those paths *before* trying to set the kernel consumer sockets and init
4649 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4654 /* Setup kernel tracer */
4655 if (!opt_no_kernel
) {
4656 init_kernel_tracer();
4659 /* Set ulimit for open files */
4662 /* init lttng_fd tracking must be done after set_ulimit. */
4665 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4670 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4675 if ((ret
= set_signal_handler()) < 0) {
4679 /* Setup the needed unix socket */
4680 if ((ret
= init_daemon_socket()) < 0) {
4684 /* Set credentials to socket */
4685 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4689 /* Get parent pid if -S, --sig-parent is specified. */
4690 if (opt_sig_parent
) {
4694 /* Setup the kernel pipe for waking up the kernel thread */
4695 if ((ret
= create_kernel_poll_pipe()) < 0) {
4699 /* Setup the thread apps communication pipe. */
4700 if ((ret
= create_apps_cmd_pipe()) < 0) {
4704 /* Init UST command queue. */
4705 cds_wfq_init(&ust_cmd_queue
.queue
);
4708 * Get session list pointer. This pointer MUST NOT be free(). This list is
4709 * statically declared in session.c
4711 session_list_ptr
= session_get_list();
4713 /* Set up max poll set size */
4714 lttng_poll_set_max_size();
4718 /* Create thread to manage the client socket */
4719 ret
= pthread_create(&client_thread
, NULL
,
4720 thread_manage_clients
, (void *) NULL
);
4722 PERROR("pthread_create clients");
4726 /* Create thread to dispatch registration */
4727 ret
= pthread_create(&dispatch_thread
, NULL
,
4728 thread_dispatch_ust_registration
, (void *) NULL
);
4730 PERROR("pthread_create dispatch");
4734 /* Create thread to manage application registration. */
4735 ret
= pthread_create(®_apps_thread
, NULL
,
4736 thread_registration_apps
, (void *) NULL
);
4738 PERROR("pthread_create registration");
4742 /* Create thread to manage application socket */
4743 ret
= pthread_create(&apps_thread
, NULL
,
4744 thread_manage_apps
, (void *) NULL
);
4746 PERROR("pthread_create apps");
4750 /* Create kernel thread to manage kernel event */
4751 ret
= pthread_create(&kernel_thread
, NULL
,
4752 thread_manage_kernel
, (void *) NULL
);
4754 PERROR("pthread_create kernel");
4758 tracepoint(sessiond_boot_end
);
4760 ret
= pthread_join(kernel_thread
, &status
);
4762 PERROR("pthread_join");
4763 goto error
; /* join error, exit without cleanup */
4767 ret
= pthread_join(apps_thread
, &status
);
4769 PERROR("pthread_join");
4770 goto error
; /* join error, exit without cleanup */
4774 ret
= pthread_join(reg_apps_thread
, &status
);
4776 PERROR("pthread_join");
4777 goto error
; /* join error, exit without cleanup */
4781 ret
= pthread_join(dispatch_thread
, &status
);
4783 PERROR("pthread_join");
4784 goto error
; /* join error, exit without cleanup */
4788 ret
= pthread_join(client_thread
, &status
);
4790 PERROR("pthread_join");
4791 goto error
; /* join error, exit without cleanup */
4794 ret
= join_consumer_thread(&kconsumer_data
);
4796 PERROR("join_consumer");
4797 goto error
; /* join error, exit without cleanup */
4803 * cleanup() is called when no other thread is running.
4805 rcu_thread_online();
4807 rcu_thread_offline();
4808 rcu_unregister_thread();