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();
495 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
496 "Matthew, BEET driven development works!%c[%dm",
497 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
502 * Send data on a unix socket using the liblttsessiondcomm API.
504 * Return lttcomm error code.
506 static int send_unix_sock(int sock
, void *buf
, size_t len
)
508 /* Check valid length */
513 return lttcomm_send_unix_sock(sock
, buf
, len
);
517 * Free memory of a command context structure.
519 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
521 DBG("Clean command context structure");
523 if ((*cmd_ctx
)->llm
) {
524 free((*cmd_ctx
)->llm
);
526 if ((*cmd_ctx
)->lsm
) {
527 free((*cmd_ctx
)->lsm
);
535 * Send all stream fds of kernel channel to the consumer.
537 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
538 int sock
, struct ltt_kernel_channel
*channel
,
539 uid_t uid
, gid_t gid
)
542 struct ltt_kernel_stream
*stream
;
543 struct lttcomm_consumer_msg lkm
;
545 DBG("Sending streams of channel %s to kernel consumer",
546 channel
->channel
->name
);
549 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
550 lkm
.u
.channel
.channel_key
= channel
->fd
;
551 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
552 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
553 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
554 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
556 PERROR("send consumer channel");
561 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
565 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
566 lkm
.u
.stream
.channel_key
= channel
->fd
;
567 lkm
.u
.stream
.stream_key
= stream
->fd
;
568 lkm
.u
.stream
.state
= stream
->state
;
569 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
570 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
571 lkm
.u
.stream
.uid
= uid
;
572 lkm
.u
.stream
.gid
= gid
;
573 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
574 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
575 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
576 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
578 PERROR("send consumer stream");
581 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
583 PERROR("send consumer stream ancillary data");
588 DBG("consumer channel streams sent");
597 * Send all stream fds of the kernel session to the consumer.
599 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
600 struct ltt_kernel_session
*session
)
603 struct ltt_kernel_channel
*chan
;
604 struct lttcomm_consumer_msg lkm
;
605 int sock
= session
->consumer_fd
;
607 DBG("Sending metadata stream fd");
609 /* Extra protection. It's NOT supposed to be set to -1 at this point */
610 if (session
->consumer_fd
< 0) {
611 session
->consumer_fd
= consumer_data
->cmd_sock
;
614 if (session
->metadata_stream_fd
>= 0) {
615 /* Send metadata channel fd */
616 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
617 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
618 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
619 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
620 DBG("Sending metadata channel %d to consumer", lkm
.u
.channel
.channel_key
);
621 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
623 PERROR("send consumer channel");
627 /* Send metadata stream fd */
628 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
629 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
630 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
631 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
632 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
633 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
634 lkm
.u
.stream
.uid
= session
->uid
;
635 lkm
.u
.stream
.gid
= session
->gid
;
636 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
637 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
638 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
639 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
641 PERROR("send consumer stream");
644 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
646 PERROR("send consumer stream");
651 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
652 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
653 session
->uid
, session
->gid
);
659 DBG("consumer fds (metadata and channel streams) sent");
668 * Notify UST applications using the shm mmap futex.
670 static int notify_ust_apps(int active
)
674 DBG("Notifying applications of session daemon state: %d", active
);
676 /* See shm.c for this call implying mmap, shm and futex calls */
677 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
678 if (wait_shm_mmap
== NULL
) {
682 tracepoint(ust_notify_apps_start
);
684 /* Wake waiting process */
685 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
687 tracepoint(ust_notify_apps_stop
);
689 /* Apps notified successfully */
697 * Setup the outgoing data buffer for the response (llm) by allocating the
698 * right amount of memory and copying the original information from the lsm
701 * Return total size of the buffer pointed by buf.
703 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
709 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
710 if (cmd_ctx
->llm
== NULL
) {
716 /* Copy common data */
717 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
718 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
720 cmd_ctx
->llm
->data_size
= size
;
721 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
730 * Update the kernel poll set of all channel fd available over all tracing
731 * session. Add the wakeup pipe at the end of the set.
733 static int update_kernel_poll(struct lttng_poll_event
*events
)
736 struct ltt_session
*session
;
737 struct ltt_kernel_channel
*channel
;
739 DBG("Updating kernel poll set");
742 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
743 session_lock(session
);
744 if (session
->kernel_session
== NULL
) {
745 session_unlock(session
);
749 cds_list_for_each_entry(channel
,
750 &session
->kernel_session
->channel_list
.head
, list
) {
751 /* Add channel fd to the kernel poll set */
752 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
754 session_unlock(session
);
757 DBG("Channel fd %d added to kernel set", channel
->fd
);
759 session_unlock(session
);
761 session_unlock_list();
766 session_unlock_list();
771 * Find the channel fd from 'fd' over all tracing session. When found, check
772 * for new channel stream and send those stream fds to the kernel consumer.
774 * Useful for CPU hotplug feature.
776 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
779 struct ltt_session
*session
;
780 struct ltt_kernel_channel
*channel
;
782 DBG("Updating kernel streams for channel fd %d", fd
);
785 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
786 session_lock(session
);
787 if (session
->kernel_session
== NULL
) {
788 session_unlock(session
);
792 /* This is not suppose to be -1 but this is an extra security check */
793 if (session
->kernel_session
->consumer_fd
< 0) {
794 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
797 cds_list_for_each_entry(channel
,
798 &session
->kernel_session
->channel_list
.head
, list
) {
799 if (channel
->fd
== fd
) {
800 DBG("Channel found, updating kernel streams");
801 ret
= kernel_open_channel_stream(channel
);
807 * Have we already sent fds to the consumer? If yes, it means
808 * that tracing is started so it is safe to send our updated
811 if (session
->kernel_session
->consumer_fds_sent
== 1) {
812 ret
= send_kconsumer_channel_streams(consumer_data
,
813 session
->kernel_session
->consumer_fd
, channel
,
814 session
->uid
, session
->gid
);
822 session_unlock(session
);
824 session_unlock_list();
828 session_unlock(session
);
829 session_unlock_list();
834 * For each tracing session, update newly registered apps.
836 static void update_ust_app(int app_sock
)
838 struct ltt_session
*sess
, *stmp
;
842 /* For all tracing session(s) */
843 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
845 if (sess
->ust_session
) {
846 ust_app_global_update(sess
->ust_session
, app_sock
);
848 session_unlock(sess
);
851 session_unlock_list();
855 * This thread manage event coming from the kernel.
857 * Features supported in this thread:
860 static void *thread_manage_kernel(void *data
)
862 int ret
, i
, pollfd
, update_poll_flag
= 1;
863 uint32_t revents
, nb_fd
;
865 struct lttng_poll_event events
;
867 tracepoint(sessiond_th_kern_start
);
869 DBG("Thread manage kernel started");
871 ret
= create_thread_poll_set(&events
, 2);
873 goto error_poll_create
;
876 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
882 if (update_poll_flag
== 1) {
884 * Reset number of fd in the poll set. Always 2 since there is the thread
885 * quit pipe and the kernel pipe.
889 ret
= update_kernel_poll(&events
);
893 update_poll_flag
= 0;
896 nb_fd
= LTTNG_POLL_GETNB(&events
);
898 DBG("Thread kernel polling on %d fds", nb_fd
);
900 /* Zeroed the poll events */
901 lttng_poll_reset(&events
);
903 tracepoint(sessiond_th_kern_poll
);
905 /* Poll infinite value of time */
907 ret
= lttng_poll_wait(&events
, -1);
910 * Restart interrupted system call.
912 if (errno
== EINTR
) {
916 } else if (ret
== 0) {
917 /* Should not happen since timeout is infinite */
918 ERR("Return value of poll is 0 with an infinite timeout.\n"
919 "This should not have happened! Continuing...");
923 for (i
= 0; i
< nb_fd
; i
++) {
924 /* Fetch once the poll data */
925 revents
= LTTNG_POLL_GETEV(&events
, i
);
926 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
928 /* Thread quit pipe has been closed. Killing thread. */
929 ret
= check_thread_quit_pipe(pollfd
, revents
);
934 /* Check for data on kernel pipe */
935 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
936 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
937 update_poll_flag
= 1;
941 * New CPU detected by the kernel. Adding kernel stream to
942 * kernel session and updating the kernel consumer
944 if (revents
& LPOLLIN
) {
945 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
951 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
952 * and unregister kernel stream at this point.
960 lttng_poll_clean(&events
);
962 DBG("Kernel thread dying");
967 * This thread manage the consumer error sent back to the session daemon.
969 static void *thread_manage_consumer(void *data
)
971 int sock
= -1, i
, ret
, pollfd
;
972 uint32_t revents
, nb_fd
;
973 enum lttcomm_return_code code
;
974 struct lttng_poll_event events
;
975 struct consumer_data
*consumer_data
= data
;
977 tracepoint(sessiond_th_kcon_start
);
979 DBG("[thread] Manage consumer started");
981 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
987 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
988 * Nothing more will be added to this poll set.
990 ret
= create_thread_poll_set(&events
, 2);
995 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1000 nb_fd
= LTTNG_POLL_GETNB(&events
);
1002 tracepoint(sessiond_th_kcon_poll
);
1004 /* Inifinite blocking call, waiting for transmission */
1006 ret
= lttng_poll_wait(&events
, -1);
1009 * Restart interrupted system call.
1011 if (errno
== EINTR
) {
1017 for (i
= 0; i
< nb_fd
; i
++) {
1018 /* Fetch once the poll data */
1019 revents
= LTTNG_POLL_GETEV(&events
, i
);
1020 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1022 /* Thread quit pipe has been closed. Killing thread. */
1023 ret
= check_thread_quit_pipe(pollfd
, revents
);
1028 /* Event on the registration socket */
1029 if (pollfd
== consumer_data
->err_sock
) {
1030 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1031 ERR("consumer err socket poll error");
1037 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1042 DBG2("Receiving code from consumer err_sock");
1044 /* Getting status code from kconsumerd */
1045 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1046 sizeof(enum lttcomm_return_code
));
1051 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1052 consumer_data
->cmd_sock
=
1053 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1054 if (consumer_data
->cmd_sock
< 0) {
1055 sem_post(&consumer_data
->sem
);
1056 PERROR("consumer connect");
1059 /* Signal condition to tell that the kconsumerd is ready */
1060 sem_post(&consumer_data
->sem
);
1061 DBG("consumer command socket ready");
1063 ERR("consumer error when waiting for SOCK_READY : %s",
1064 lttcomm_get_readable_code(-code
));
1068 /* Remove the kconsumerd error sock since we've established a connexion */
1069 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1074 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1079 /* Update number of fd */
1080 nb_fd
= LTTNG_POLL_GETNB(&events
);
1082 /* Inifinite blocking call, waiting for transmission */
1084 ret
= lttng_poll_wait(&events
, -1);
1087 * Restart interrupted system call.
1089 if (errno
== EINTR
) {
1095 for (i
= 0; i
< nb_fd
; i
++) {
1096 /* Fetch once the poll data */
1097 revents
= LTTNG_POLL_GETEV(&events
, i
);
1098 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1100 /* Thread quit pipe has been closed. Killing thread. */
1101 ret
= check_thread_quit_pipe(pollfd
, revents
);
1106 /* Event on the kconsumerd socket */
1107 if (pollfd
== sock
) {
1108 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1109 ERR("consumer err socket second poll error");
1115 /* Wait for any kconsumerd error */
1116 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1117 sizeof(enum lttcomm_return_code
));
1119 ERR("consumer closed the command socket");
1123 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1126 if (consumer_data
->err_sock
>= 0) {
1127 ret
= close(consumer_data
->err_sock
);
1132 if (consumer_data
->cmd_sock
>= 0) {
1133 ret
= close(consumer_data
->cmd_sock
);
1145 unlink(consumer_data
->err_unix_sock_path
);
1146 unlink(consumer_data
->cmd_unix_sock_path
);
1147 consumer_data
->pid
= 0;
1149 lttng_poll_clean(&events
);
1152 DBG("consumer thread cleanup completed");
1158 * This thread manage application communication.
1160 static void *thread_manage_apps(void *data
)
1163 uint32_t revents
, nb_fd
;
1164 struct ust_command ust_cmd
;
1165 struct lttng_poll_event events
;
1167 tracepoint(sessiond_th_apps_start
);
1169 DBG("[thread] Manage application started");
1171 rcu_register_thread();
1172 rcu_thread_online();
1174 ret
= create_thread_poll_set(&events
, 2);
1176 goto error_poll_create
;
1179 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1185 /* Zeroed the events structure */
1186 lttng_poll_reset(&events
);
1188 nb_fd
= LTTNG_POLL_GETNB(&events
);
1190 DBG("Apps thread polling on %d fds", nb_fd
);
1192 tracepoint(sessiond_th_apps_poll
);
1194 /* Inifinite blocking call, waiting for transmission */
1196 ret
= lttng_poll_wait(&events
, -1);
1199 * Restart interrupted system call.
1201 if (errno
== EINTR
) {
1207 for (i
= 0; i
< nb_fd
; i
++) {
1208 /* Fetch once the poll data */
1209 revents
= LTTNG_POLL_GETEV(&events
, i
);
1210 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1212 /* Thread quit pipe has been closed. Killing thread. */
1213 ret
= check_thread_quit_pipe(pollfd
, revents
);
1218 /* Inspect the apps cmd pipe */
1219 if (pollfd
== apps_cmd_pipe
[0]) {
1220 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1221 ERR("Apps command pipe error");
1223 } else if (revents
& LPOLLIN
) {
1224 system("sysctl vm.drop_caches=3");
1225 tracepoint(ust_register_read_start
);
1227 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1228 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1229 PERROR("read apps cmd pipe");
1232 tracepoint(ust_register_read_stop
);
1234 tracepoint(ust_register_add_start
);
1235 /* Register applicaton to the session daemon */
1236 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1238 if (ret
== -ENOMEM
) {
1240 } else if (ret
< 0) {
1243 tracepoint(ust_register_add_stop
);
1246 * Validate UST version compatibility.
1248 ret
= ust_app_validate_version(ust_cmd
.sock
);
1251 * Add channel(s) and event(s) to newly registered apps
1252 * from lttng global UST domain.
1254 update_ust_app(ust_cmd
.sock
);
1257 tracepoint(ust_register_done_start
);
1258 ret
= ust_app_register_done(ust_cmd
.sock
);
1261 * If the registration is not possible, we simply
1262 * unregister the apps and continue
1264 ust_app_unregister(ust_cmd
.sock
);
1266 tracepoint(ust_register_done_stop
);
1268 * We just need here to monitor the close of the UST
1269 * socket and poll set monitor those by default.
1270 * Listen on POLLIN (even if we never expect any
1271 * data) to ensure that hangup wakes us.
1273 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1278 DBG("Apps with sock %d added to poll set",
1285 * At this point, we know that a registered application made
1286 * the event at poll_wait.
1288 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1289 tracepoint(ust_unregister_start
);
1291 /* Removing from the poll set */
1292 ret
= lttng_poll_del(&events
, pollfd
);
1297 /* Socket closed on remote end. */
1298 ust_app_unregister(pollfd
);
1300 tracepoint(ust_unregister_stop
);
1308 lttng_poll_clean(&events
);
1310 DBG("Application communication apps thread cleanup complete");
1311 rcu_thread_offline();
1312 rcu_unregister_thread();
1317 * Dispatch request from the registration threads to the application
1318 * communication thread.
1320 static void *thread_dispatch_ust_registration(void *data
)
1323 struct cds_wfq_node
*node
;
1324 struct ust_command
*ust_cmd
= NULL
;
1326 tracepoint(sessiond_th_dispatch_start
);
1328 DBG("[thread] Dispatch UST command started");
1330 while (!dispatch_thread_exit
) {
1331 /* Atomically prepare the queue futex */
1332 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1335 tracepoint(sessiond_th_dispatch_block
);
1337 /* Dequeue command for registration */
1338 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1340 DBG("Woken up but nothing in the UST command queue");
1341 /* Continue thread execution */
1345 tracepoint(ust_dispatch_register_start
);
1347 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1349 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1350 " gid:%d sock:%d name:%s (version %d.%d)",
1351 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1352 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1353 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1354 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1356 * Inform apps thread of the new application registration. This
1357 * call is blocking so we can be assured that the data will be read
1358 * at some point in time or wait to the end of the world :)
1360 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1361 sizeof(struct ust_command
));
1363 PERROR("write apps cmd pipe");
1364 if (errno
== EBADF
) {
1366 * We can't inform the application thread to process
1367 * registration. We will exit or else application
1368 * registration will not occur and tracing will never
1375 } while (node
!= NULL
);
1377 tracepoint(ust_dispatch_register_stop
);
1379 /* Futex wait on queue. Blocking call on futex() */
1380 futex_nto1_wait(&ust_cmd_queue
.futex
);
1384 DBG("Dispatch thread dying");
1389 * This thread manage application registration.
1391 static void *thread_registration_apps(void *data
)
1393 int sock
= -1, i
, ret
, pollfd
;
1394 uint32_t revents
, nb_fd
;
1395 struct lttng_poll_event events
;
1397 * Get allocated in this thread, enqueued to a global queue, dequeued and
1398 * freed in the manage apps thread.
1400 struct ust_command
*ust_cmd
= NULL
;
1402 tracepoint(sessiond_th_reg_start
);
1404 DBG("[thread] Manage application registration started");
1406 ret
= lttcomm_listen_unix_sock(apps_sock
);
1412 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1413 * more will be added to this poll set.
1415 ret
= create_thread_poll_set(&events
, 2);
1417 goto error_create_poll
;
1420 /* Add the application registration socket */
1421 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1423 goto error_poll_add
;
1426 /* Notify all applications to register */
1427 ret
= notify_ust_apps(1);
1429 ERR("Failed to notify applications or create the wait shared memory.\n"
1430 "Execution continues but there might be problem for already\n"
1431 "running applications that wishes to register.");
1435 DBG("Accepting application registration");
1437 tracepoint(sessiond_th_reg_poll
);
1439 nb_fd
= LTTNG_POLL_GETNB(&events
);
1441 /* Inifinite blocking call, waiting for transmission */
1443 ret
= lttng_poll_wait(&events
, -1);
1446 * Restart interrupted system call.
1448 if (errno
== EINTR
) {
1454 for (i
= 0; i
< nb_fd
; i
++) {
1455 /* Fetch once the poll data */
1456 revents
= LTTNG_POLL_GETEV(&events
, i
);
1457 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1459 /* Thread quit pipe has been closed. Killing thread. */
1460 ret
= check_thread_quit_pipe(pollfd
, revents
);
1465 /* Event on the registration socket */
1466 if (pollfd
== apps_sock
) {
1467 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1468 ERR("Register apps socket poll error");
1470 } else if (revents
& LPOLLIN
) {
1471 /* Registration starts here. Recording cycles */
1472 tracepoint(ust_register_start
);
1474 sock
= lttcomm_accept_unix_sock(apps_sock
);
1479 /* Create UST registration command for enqueuing */
1480 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1481 if (ust_cmd
== NULL
) {
1482 PERROR("ust command zmalloc");
1487 * Using message-based transmissions to ensure we don't
1488 * have to deal with partially received messages.
1490 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1492 ERR("Exhausted file descriptors allowed for applications.");
1501 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1502 sizeof(struct ust_register_msg
));
1503 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1505 PERROR("lttcomm_recv_unix_sock register apps");
1507 ERR("Wrong size received on apps register");
1514 lttng_fd_put(LTTNG_FD_APPS
, 1);
1519 ust_cmd
->sock
= sock
;
1522 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1523 " gid:%d sock:%d name:%s (version %d.%d)",
1524 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1525 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1526 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1527 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1530 * Lock free enqueue the registration request. The red pill
1531 * has been taken! This apps will be part of the *system*.
1533 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1536 * Wake the registration queue futex. Implicit memory
1537 * barrier with the exchange in cds_wfq_enqueue.
1539 futex_nto1_wake(&ust_cmd_queue
.futex
);
1541 tracepoint(ust_register_stop
);
1548 /* Notify that the registration thread is gone */
1551 if (apps_sock
>= 0) {
1552 ret
= close(apps_sock
);
1562 lttng_fd_put(LTTNG_FD_APPS
, 1);
1564 unlink(apps_unix_sock_path
);
1567 lttng_poll_clean(&events
);
1570 DBG("UST Registration thread cleanup complete");
1576 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1577 * exec or it will fails.
1579 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1582 struct timespec timeout
;
1584 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1585 timeout
.tv_nsec
= 0;
1587 /* Setup semaphore */
1588 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1590 PERROR("sem_init consumer semaphore");
1594 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1595 thread_manage_consumer
, consumer_data
);
1597 PERROR("pthread_create consumer");
1602 /* Get time for sem_timedwait absolute timeout */
1603 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1605 PERROR("clock_gettime spawn consumer");
1606 /* Infinite wait for the kconsumerd thread to be ready */
1607 ret
= sem_wait(&consumer_data
->sem
);
1609 /* Normal timeout if the gettime was successful */
1610 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1611 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1615 if (errno
== ETIMEDOUT
) {
1617 * Call has timed out so we kill the kconsumerd_thread and return
1620 ERR("The consumer thread was never ready. Killing it");
1621 ret
= pthread_cancel(consumer_data
->thread
);
1623 PERROR("pthread_cancel consumer thread");
1626 PERROR("semaphore wait failed consumer thread");
1631 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1632 if (consumer_data
->pid
== 0) {
1633 ERR("Kconsumerd did not start");
1634 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1637 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1646 * Join consumer thread
1648 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1653 if (consumer_data
->pid
!= 0) {
1654 ret
= kill(consumer_data
->pid
, SIGTERM
);
1656 ERR("Error killing consumer daemon");
1659 return pthread_join(consumer_data
->thread
, &status
);
1666 * Fork and exec a consumer daemon (consumerd).
1668 * Return pid if successful else -1.
1670 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1674 const char *consumer_to_use
;
1675 const char *verbosity
;
1678 DBG("Spawning consumerd");
1685 if (opt_verbose_consumer
) {
1686 verbosity
= "--verbose";
1688 verbosity
= "--quiet";
1690 switch (consumer_data
->type
) {
1691 case LTTNG_CONSUMER_KERNEL
:
1693 * Find out which consumerd to execute. We will first try the
1694 * 64-bit path, then the sessiond's installation directory, and
1695 * fallback on the 32-bit one,
1697 DBG3("Looking for a kernel consumer at these locations:");
1698 DBG3(" 1) %s", consumerd64_bin
);
1699 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1700 DBG3(" 3) %s", consumerd32_bin
);
1701 if (stat(consumerd64_bin
, &st
) == 0) {
1702 DBG3("Found location #1");
1703 consumer_to_use
= consumerd64_bin
;
1704 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1705 DBG3("Found location #2");
1706 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1707 } else if (stat(consumerd32_bin
, &st
) == 0) {
1708 DBG3("Found location #3");
1709 consumer_to_use
= consumerd32_bin
;
1711 DBG("Could not find any valid consumerd executable");
1714 DBG("Using kernel consumer at: %s", consumer_to_use
);
1715 execl(consumer_to_use
,
1716 "lttng-consumerd", verbosity
, "-k",
1717 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1718 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1721 case LTTNG_CONSUMER64_UST
:
1723 char *tmpnew
= NULL
;
1725 if (consumerd64_libdir
[0] != '\0') {
1729 tmp
= getenv("LD_LIBRARY_PATH");
1733 tmplen
= strlen("LD_LIBRARY_PATH=")
1734 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1735 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1740 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1741 strcat(tmpnew
, consumerd64_libdir
);
1742 if (tmp
[0] != '\0') {
1743 strcat(tmpnew
, ":");
1744 strcat(tmpnew
, tmp
);
1746 ret
= putenv(tmpnew
);
1752 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1753 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1754 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1755 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1757 if (consumerd64_libdir
[0] != '\0') {
1765 case LTTNG_CONSUMER32_UST
:
1767 char *tmpnew
= NULL
;
1769 if (consumerd32_libdir
[0] != '\0') {
1773 tmp
= getenv("LD_LIBRARY_PATH");
1777 tmplen
= strlen("LD_LIBRARY_PATH=")
1778 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1779 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1784 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1785 strcat(tmpnew
, consumerd32_libdir
);
1786 if (tmp
[0] != '\0') {
1787 strcat(tmpnew
, ":");
1788 strcat(tmpnew
, tmp
);
1790 ret
= putenv(tmpnew
);
1796 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1797 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1798 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1799 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1801 if (consumerd32_libdir
[0] != '\0') {
1810 PERROR("unknown consumer type");
1814 PERROR("kernel start consumer exec");
1817 } else if (pid
> 0) {
1820 PERROR("start consumer fork");
1828 * Spawn the consumerd daemon and session daemon thread.
1830 static int start_consumerd(struct consumer_data
*consumer_data
)
1834 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1835 if (consumer_data
->pid
!= 0) {
1836 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1840 ret
= spawn_consumerd(consumer_data
);
1842 ERR("Spawning consumerd failed");
1843 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1847 /* Setting up the consumer_data pid */
1848 consumer_data
->pid
= ret
;
1849 DBG2("Consumer pid %d", consumer_data
->pid
);
1850 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1852 DBG2("Spawning consumer control thread");
1853 ret
= spawn_consumer_thread(consumer_data
);
1855 ERR("Fatal error spawning consumer control thread");
1867 * Check version of the lttng-modules.
1869 static int validate_lttng_modules_version(void)
1871 return kernel_validate_version(kernel_tracer_fd
);
1875 * Setup necessary data for kernel tracer action.
1877 static int init_kernel_tracer(void)
1881 /* Modprobe lttng kernel modules */
1882 ret
= modprobe_lttng_control();
1887 /* Open debugfs lttng */
1888 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1889 if (kernel_tracer_fd
< 0) {
1890 DBG("Failed to open %s", module_proc_lttng
);
1895 /* Validate kernel version */
1896 ret
= validate_lttng_modules_version();
1901 ret
= modprobe_lttng_data();
1906 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1910 modprobe_remove_lttng_control();
1911 ret
= close(kernel_tracer_fd
);
1915 kernel_tracer_fd
= -1;
1916 return LTTCOMM_KERN_VERSION
;
1919 ret
= close(kernel_tracer_fd
);
1925 modprobe_remove_lttng_control();
1928 WARN("No kernel tracer available");
1929 kernel_tracer_fd
= -1;
1931 return LTTCOMM_NEED_ROOT_SESSIOND
;
1933 return LTTCOMM_KERN_NA
;
1938 * Init tracing by creating trace directory and sending fds kernel consumer.
1940 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1944 if (session
->consumer_fds_sent
== 0) {
1946 * Assign default kernel consumer socket if no consumer assigned to the
1947 * kernel session. At this point, it's NOT supposed to be -1 but this is
1948 * an extra security check.
1950 if (session
->consumer_fd
< 0) {
1951 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1954 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1956 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1960 session
->consumer_fds_sent
= 1;
1968 * Create an UST session and add it to the session ust list.
1970 static int create_ust_session(struct ltt_session
*session
,
1971 struct lttng_domain
*domain
)
1973 struct ltt_ust_session
*lus
= NULL
;
1976 switch (domain
->type
) {
1977 case LTTNG_DOMAIN_UST
:
1980 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1984 DBG("Creating UST session");
1986 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1988 ret
= LTTCOMM_UST_SESS_FAIL
;
1992 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1993 session
->uid
, session
->gid
);
1995 if (ret
!= -EEXIST
) {
1996 ERR("Trace directory creation error");
1997 ret
= LTTCOMM_UST_SESS_FAIL
;
2002 /* The domain type dictate different actions on session creation */
2003 switch (domain
->type
) {
2004 case LTTNG_DOMAIN_UST
:
2005 /* No ustctl for the global UST domain */
2008 ERR("Unknown UST domain on create session %d", domain
->type
);
2011 lus
->uid
= session
->uid
;
2012 lus
->gid
= session
->gid
;
2013 session
->ust_session
= lus
;
2023 * Create a kernel tracer session then create the default channel.
2025 static int create_kernel_session(struct ltt_session
*session
)
2029 DBG("Creating kernel session");
2031 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2033 ret
= LTTCOMM_KERN_SESS_FAIL
;
2037 /* Set kernel consumer socket fd */
2038 if (kconsumer_data
.cmd_sock
>= 0) {
2039 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
2042 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
2043 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2045 if (ret
!= -EEXIST
) {
2046 ERR("Trace directory creation error");
2050 session
->kernel_session
->uid
= session
->uid
;
2051 session
->kernel_session
->gid
= session
->gid
;
2058 * Check if the UID or GID match the session. Root user has access to all
2061 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
2063 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
2070 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2073 struct ltt_session
*session
;
2075 DBG("Counting number of available session for UID %d GID %d",
2077 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2079 * Only list the sessions the user can control.
2081 if (!session_access_ok(session
, uid
, gid
)) {
2090 * Using the session list, filled a lttng_session array to send back to the
2091 * client for session listing.
2093 * The session list lock MUST be acquired before calling this function. Use
2094 * session_lock_list() and session_unlock_list().
2096 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2100 struct ltt_session
*session
;
2102 DBG("Getting all available session for UID %d GID %d",
2105 * Iterate over session list and append data after the control struct in
2108 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2110 * Only list the sessions the user can control.
2112 if (!session_access_ok(session
, uid
, gid
)) {
2115 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2116 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2117 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2118 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2119 sessions
[i
].enabled
= session
->enabled
;
2125 * Fill lttng_channel array of all channels.
2127 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2128 struct lttng_channel
*channels
)
2131 struct ltt_kernel_channel
*kchan
;
2133 DBG("Listing channels for session %s", session
->name
);
2136 case LTTNG_DOMAIN_KERNEL
:
2137 /* Kernel channels */
2138 if (session
->kernel_session
!= NULL
) {
2139 cds_list_for_each_entry(kchan
,
2140 &session
->kernel_session
->channel_list
.head
, list
) {
2141 /* Copy lttng_channel struct to array */
2142 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2143 channels
[i
].enabled
= kchan
->enabled
;
2148 case LTTNG_DOMAIN_UST
:
2150 struct lttng_ht_iter iter
;
2151 struct ltt_ust_channel
*uchan
;
2153 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2154 &iter
.iter
, uchan
, node
.node
) {
2155 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2156 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2157 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2158 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2159 channels
[i
].attr
.switch_timer_interval
=
2160 uchan
->attr
.switch_timer_interval
;
2161 channels
[i
].attr
.read_timer_interval
=
2162 uchan
->attr
.read_timer_interval
;
2163 channels
[i
].enabled
= uchan
->enabled
;
2164 switch (uchan
->attr
.output
) {
2165 case LTTNG_UST_MMAP
:
2167 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2180 * Create a list of ust global domain events.
2182 static int list_lttng_ust_global_events(char *channel_name
,
2183 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2186 unsigned int nb_event
= 0;
2187 struct lttng_ht_iter iter
;
2188 struct lttng_ht_node_str
*node
;
2189 struct ltt_ust_channel
*uchan
;
2190 struct ltt_ust_event
*uevent
;
2191 struct lttng_event
*tmp
;
2193 DBG("Listing UST global events for channel %s", channel_name
);
2197 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2198 node
= lttng_ht_iter_get_node_str(&iter
);
2200 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2204 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2206 nb_event
+= lttng_ht_get_count(uchan
->events
);
2208 if (nb_event
== 0) {
2213 DBG3("Listing UST global %d events", nb_event
);
2215 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2217 ret
= -LTTCOMM_FATAL
;
2221 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2222 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2223 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2224 tmp
[i
].enabled
= uevent
->enabled
;
2225 switch (uevent
->attr
.instrumentation
) {
2226 case LTTNG_UST_TRACEPOINT
:
2227 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2229 case LTTNG_UST_PROBE
:
2230 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2232 case LTTNG_UST_FUNCTION
:
2233 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2236 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
2237 switch (uevent
->attr
.loglevel_type
) {
2238 case LTTNG_UST_LOGLEVEL_ALL
:
2239 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2241 case LTTNG_UST_LOGLEVEL_RANGE
:
2242 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
2244 case LTTNG_UST_LOGLEVEL_SINGLE
:
2245 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
2260 * Fill lttng_event array of all kernel events in the channel.
2262 static int list_lttng_kernel_events(char *channel_name
,
2263 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2266 unsigned int nb_event
;
2267 struct ltt_kernel_event
*event
;
2268 struct ltt_kernel_channel
*kchan
;
2270 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2271 if (kchan
== NULL
) {
2272 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2276 nb_event
= kchan
->event_count
;
2278 DBG("Listing events for channel %s", kchan
->channel
->name
);
2280 if (nb_event
== 0) {
2285 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2286 if (*events
== NULL
) {
2287 ret
= LTTCOMM_FATAL
;
2291 /* Kernel channels */
2292 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2293 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2294 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2295 (*events
)[i
].enabled
= event
->enabled
;
2296 switch (event
->event
->instrumentation
) {
2297 case LTTNG_KERNEL_TRACEPOINT
:
2298 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2300 case LTTNG_KERNEL_KPROBE
:
2301 case LTTNG_KERNEL_KRETPROBE
:
2302 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2303 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2304 sizeof(struct lttng_kernel_kprobe
));
2306 case LTTNG_KERNEL_FUNCTION
:
2307 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2308 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2309 sizeof(struct lttng_kernel_function
));
2311 case LTTNG_KERNEL_NOOP
:
2312 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2314 case LTTNG_KERNEL_SYSCALL
:
2315 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2317 case LTTNG_KERNEL_ALL
:
2331 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2333 static int cmd_disable_channel(struct ltt_session
*session
,
2334 int domain
, char *channel_name
)
2337 struct ltt_ust_session
*usess
;
2339 usess
= session
->ust_session
;
2342 case LTTNG_DOMAIN_KERNEL
:
2344 ret
= channel_kernel_disable(session
->kernel_session
,
2346 if (ret
!= LTTCOMM_OK
) {
2350 kernel_wait_quiescent(kernel_tracer_fd
);
2353 case LTTNG_DOMAIN_UST
:
2355 struct ltt_ust_channel
*uchan
;
2356 struct lttng_ht
*chan_ht
;
2358 chan_ht
= usess
->domain_global
.channels
;
2360 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2361 if (uchan
== NULL
) {
2362 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2366 ret
= channel_ust_disable(usess
, domain
, uchan
);
2367 if (ret
!= LTTCOMM_OK
) {
2373 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2374 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2375 case LTTNG_DOMAIN_UST_PID
:
2378 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2389 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2391 static int cmd_enable_channel(struct ltt_session
*session
,
2392 int domain
, struct lttng_channel
*attr
)
2395 struct ltt_ust_session
*usess
= session
->ust_session
;
2396 struct lttng_ht
*chan_ht
;
2398 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2401 case LTTNG_DOMAIN_KERNEL
:
2403 struct ltt_kernel_channel
*kchan
;
2405 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2406 session
->kernel_session
);
2407 if (kchan
== NULL
) {
2408 ret
= channel_kernel_create(session
->kernel_session
,
2409 attr
, kernel_poll_pipe
[1]);
2411 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2414 if (ret
!= LTTCOMM_OK
) {
2418 kernel_wait_quiescent(kernel_tracer_fd
);
2421 case LTTNG_DOMAIN_UST
:
2423 struct ltt_ust_channel
*uchan
;
2425 chan_ht
= usess
->domain_global
.channels
;
2427 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2428 if (uchan
== NULL
) {
2429 ret
= channel_ust_create(usess
, domain
, attr
);
2431 ret
= channel_ust_enable(usess
, domain
, uchan
);
2436 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2437 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2438 case LTTNG_DOMAIN_UST_PID
:
2441 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2450 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2452 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2453 char *channel_name
, char *event_name
)
2458 case LTTNG_DOMAIN_KERNEL
:
2460 struct ltt_kernel_channel
*kchan
;
2461 struct ltt_kernel_session
*ksess
;
2463 ksess
= session
->kernel_session
;
2465 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2466 if (kchan
== NULL
) {
2467 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2471 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2472 if (ret
!= LTTCOMM_OK
) {
2476 kernel_wait_quiescent(kernel_tracer_fd
);
2479 case LTTNG_DOMAIN_UST
:
2481 struct ltt_ust_channel
*uchan
;
2482 struct ltt_ust_session
*usess
;
2484 usess
= session
->ust_session
;
2486 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2488 if (uchan
== NULL
) {
2489 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2493 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2494 if (ret
!= LTTCOMM_OK
) {
2498 DBG3("Disable UST event %s in channel %s completed", event_name
,
2503 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2504 case LTTNG_DOMAIN_UST_PID
:
2505 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2519 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2521 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2527 case LTTNG_DOMAIN_KERNEL
:
2529 struct ltt_kernel_session
*ksess
;
2530 struct ltt_kernel_channel
*kchan
;
2532 ksess
= session
->kernel_session
;
2534 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2535 if (kchan
== NULL
) {
2536 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2540 ret
= event_kernel_disable_all(ksess
, kchan
);
2541 if (ret
!= LTTCOMM_OK
) {
2545 kernel_wait_quiescent(kernel_tracer_fd
);
2548 case LTTNG_DOMAIN_UST
:
2550 struct ltt_ust_session
*usess
;
2551 struct ltt_ust_channel
*uchan
;
2553 usess
= session
->ust_session
;
2555 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2557 if (uchan
== NULL
) {
2558 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2562 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2567 DBG3("Disable all UST events in channel %s completed", channel_name
);
2572 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2573 case LTTNG_DOMAIN_UST_PID
:
2574 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2588 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2590 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2591 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2596 case LTTNG_DOMAIN_KERNEL
:
2597 /* Add kernel context to kernel tracer */
2598 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2599 event_name
, channel_name
);
2600 if (ret
!= LTTCOMM_OK
) {
2604 case LTTNG_DOMAIN_UST
:
2606 struct ltt_ust_session
*usess
= session
->ust_session
;
2608 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2609 if (ret
!= LTTCOMM_OK
) {
2615 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2616 case LTTNG_DOMAIN_UST_PID
:
2617 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2631 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2633 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2634 char *channel_name
, struct lttng_event
*event
)
2637 struct lttng_channel
*attr
;
2638 struct ltt_ust_session
*usess
= session
->ust_session
;
2641 case LTTNG_DOMAIN_KERNEL
:
2643 struct ltt_kernel_channel
*kchan
;
2645 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2646 session
->kernel_session
);
2647 if (kchan
== NULL
) {
2648 attr
= channel_new_default_attr(domain
);
2650 ret
= LTTCOMM_FATAL
;
2653 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2655 /* This call will notify the kernel thread */
2656 ret
= channel_kernel_create(session
->kernel_session
,
2657 attr
, kernel_poll_pipe
[1]);
2658 if (ret
!= LTTCOMM_OK
) {
2665 /* Get the newly created kernel channel pointer */
2666 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2667 session
->kernel_session
);
2668 if (kchan
== NULL
) {
2669 /* This sould not happen... */
2670 ret
= LTTCOMM_FATAL
;
2674 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2676 if (ret
!= LTTCOMM_OK
) {
2680 kernel_wait_quiescent(kernel_tracer_fd
);
2683 case LTTNG_DOMAIN_UST
:
2685 struct lttng_channel
*attr
;
2686 struct ltt_ust_channel
*uchan
;
2688 /* Get channel from global UST domain */
2689 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2691 if (uchan
== NULL
) {
2692 /* Create default channel */
2693 attr
= channel_new_default_attr(domain
);
2695 ret
= LTTCOMM_FATAL
;
2698 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2699 attr
->name
[NAME_MAX
- 1] = '\0';
2701 ret
= channel_ust_create(usess
, domain
, attr
);
2702 if (ret
!= LTTCOMM_OK
) {
2708 /* Get the newly created channel reference back */
2709 uchan
= trace_ust_find_channel_by_name(
2710 usess
->domain_global
.channels
, channel_name
);
2711 if (uchan
== NULL
) {
2712 /* Something is really wrong */
2713 ret
= LTTCOMM_FATAL
;
2718 /* At this point, the session and channel exist on the tracer */
2719 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2720 if (ret
!= LTTCOMM_OK
) {
2726 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2727 case LTTNG_DOMAIN_UST_PID
:
2728 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2742 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2744 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2745 char *channel_name
, int event_type
)
2748 struct ltt_kernel_channel
*kchan
;
2751 case LTTNG_DOMAIN_KERNEL
:
2752 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2753 session
->kernel_session
);
2754 if (kchan
== NULL
) {
2755 /* This call will notify the kernel thread */
2756 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2757 kernel_poll_pipe
[1]);
2758 if (ret
!= LTTCOMM_OK
) {
2762 /* Get the newly created kernel channel pointer */
2763 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2764 session
->kernel_session
);
2765 if (kchan
== NULL
) {
2766 /* This sould not happen... */
2767 ret
= LTTCOMM_FATAL
;
2773 switch (event_type
) {
2774 case LTTNG_EVENT_SYSCALL
:
2775 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2776 kchan
, kernel_tracer_fd
);
2778 case LTTNG_EVENT_TRACEPOINT
:
2780 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2781 * events already registered to the channel.
2783 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2784 kchan
, kernel_tracer_fd
);
2786 case LTTNG_EVENT_ALL
:
2787 /* Enable syscalls and tracepoints */
2788 ret
= event_kernel_enable_all(session
->kernel_session
,
2789 kchan
, kernel_tracer_fd
);
2792 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2796 /* Manage return value */
2797 if (ret
!= LTTCOMM_OK
) {
2801 kernel_wait_quiescent(kernel_tracer_fd
);
2803 case LTTNG_DOMAIN_UST
:
2805 struct lttng_channel
*attr
;
2806 struct ltt_ust_channel
*uchan
;
2807 struct ltt_ust_session
*usess
= session
->ust_session
;
2809 /* Get channel from global UST domain */
2810 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2812 if (uchan
== NULL
) {
2813 /* Create default channel */
2814 attr
= channel_new_default_attr(domain
);
2816 ret
= LTTCOMM_FATAL
;
2819 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2820 attr
->name
[NAME_MAX
- 1] = '\0';
2822 /* Use the internal command enable channel */
2823 ret
= channel_ust_create(usess
, domain
, attr
);
2824 if (ret
!= LTTCOMM_OK
) {
2830 /* Get the newly created channel reference back */
2831 uchan
= trace_ust_find_channel_by_name(
2832 usess
->domain_global
.channels
, channel_name
);
2833 if (uchan
== NULL
) {
2834 /* Something is really wrong */
2835 ret
= LTTCOMM_FATAL
;
2840 /* At this point, the session and channel exist on the tracer */
2842 switch (event_type
) {
2843 case LTTNG_EVENT_ALL
:
2844 case LTTNG_EVENT_TRACEPOINT
:
2845 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2846 if (ret
!= LTTCOMM_OK
) {
2851 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2855 /* Manage return value */
2856 if (ret
!= LTTCOMM_OK
) {
2863 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2864 case LTTNG_DOMAIN_UST_PID
:
2865 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2879 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2881 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2884 ssize_t nb_events
= 0;
2887 case LTTNG_DOMAIN_KERNEL
:
2888 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2889 if (nb_events
< 0) {
2890 ret
= LTTCOMM_KERN_LIST_FAIL
;
2894 case LTTNG_DOMAIN_UST
:
2895 nb_events
= ust_app_list_events(events
);
2896 if (nb_events
< 0) {
2897 ret
= LTTCOMM_UST_LIST_FAIL
;
2909 /* Return negative value to differentiate return code */
2914 * Command LTTNG_START_TRACE processed by the client thread.
2916 static int cmd_start_trace(struct ltt_session
*session
)
2919 struct ltt_kernel_session
*ksession
;
2920 struct ltt_ust_session
*usess
;
2923 ksession
= session
->kernel_session
;
2924 usess
= session
->ust_session
;
2926 if (session
->enabled
) {
2927 /* Already started. */
2928 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2932 session
->enabled
= 1;
2934 /* Kernel tracing */
2935 if (ksession
!= NULL
) {
2936 struct ltt_kernel_channel
*kchan
;
2938 /* Open kernel metadata */
2939 if (ksession
->metadata
== NULL
) {
2940 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2942 ret
= LTTCOMM_KERN_META_FAIL
;
2947 /* Open kernel metadata stream */
2948 if (ksession
->metadata_stream_fd
< 0) {
2949 ret
= kernel_open_metadata_stream(ksession
);
2951 ERR("Kernel create metadata stream failed");
2952 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2957 /* For each channel */
2958 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2959 if (kchan
->stream_count
== 0) {
2960 ret
= kernel_open_channel_stream(kchan
);
2962 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2965 /* Update the stream global counter */
2966 ksession
->stream_count_global
+= ret
;
2970 /* Setup kernel consumer socket and send fds to it */
2971 ret
= init_kernel_tracing(ksession
);
2973 ret
= LTTCOMM_KERN_START_FAIL
;
2977 /* This start the kernel tracing */
2978 ret
= kernel_start_session(ksession
);
2980 ret
= LTTCOMM_KERN_START_FAIL
;
2984 /* Quiescent wait after starting trace */
2985 kernel_wait_quiescent(kernel_tracer_fd
);
2988 /* Flag session that trace should start automatically */
2990 usess
->start_trace
= 1;
2992 ret
= ust_app_start_trace_all(usess
);
2994 ret
= LTTCOMM_UST_START_FAIL
;
3006 * Command LTTNG_STOP_TRACE processed by the client thread.
3008 static int cmd_stop_trace(struct ltt_session
*session
)
3011 struct ltt_kernel_channel
*kchan
;
3012 struct ltt_kernel_session
*ksession
;
3013 struct ltt_ust_session
*usess
;
3016 ksession
= session
->kernel_session
;
3017 usess
= session
->ust_session
;
3019 if (!session
->enabled
) {
3020 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
3024 session
->enabled
= 0;
3027 if (ksession
!= NULL
) {
3028 DBG("Stop kernel tracing");
3030 /* Flush all buffers before stopping */
3031 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
3033 ERR("Kernel metadata flush failed");
3036 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
3037 ret
= kernel_flush_buffer(kchan
);
3039 ERR("Kernel flush buffer error");
3043 ret
= kernel_stop_session(ksession
);
3045 ret
= LTTCOMM_KERN_STOP_FAIL
;
3049 kernel_wait_quiescent(kernel_tracer_fd
);
3053 usess
->start_trace
= 0;
3055 ret
= ust_app_stop_trace_all(usess
);
3057 ret
= LTTCOMM_UST_STOP_FAIL
;
3069 * Command LTTNG_CREATE_SESSION processed by the client thread.
3071 static int cmd_create_session(char *name
, char *path
, lttng_sock_cred
*creds
)
3075 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
3076 LTTNG_SOCK_GET_GID_CRED(creds
));
3077 if (ret
!= LTTCOMM_OK
) {
3088 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3090 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3094 /* Clean kernel session teardown */
3095 teardown_kernel_session(session
);
3096 /* UST session teardown */
3097 teardown_ust_session(session
);
3100 * Must notify the kernel thread here to update it's poll setin order
3101 * to remove the channel(s)' fd just destroyed.
3103 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3105 PERROR("write kernel poll pipe");
3108 ret
= session_destroy(session
);
3114 * Command LTTNG_CALIBRATE processed by the client thread.
3116 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3121 case LTTNG_DOMAIN_KERNEL
:
3123 struct lttng_kernel_calibrate kcalibrate
;
3125 kcalibrate
.type
= calibrate
->type
;
3126 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3128 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3133 case LTTNG_DOMAIN_UST
:
3135 struct lttng_ust_calibrate ucalibrate
;
3137 ucalibrate
.type
= calibrate
->type
;
3138 ret
= ust_app_calibrate_glb(&ucalibrate
);
3140 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
3157 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3159 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3165 case LTTNG_DOMAIN_KERNEL
:
3166 /* Can't register a consumer if there is already one */
3167 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3168 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3172 sock
= lttcomm_connect_unix_sock(sock_path
);
3174 ret
= LTTCOMM_CONNECT_FAIL
;
3178 session
->kernel_session
->consumer_fd
= sock
;
3181 /* TODO: Userspace tracing */
3193 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3195 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3196 struct lttng_domain
**domains
)
3201 if (session
->kernel_session
!= NULL
) {
3202 DBG3("Listing domains found kernel domain");
3206 if (session
->ust_session
!= NULL
) {
3207 DBG3("Listing domains found UST global domain");
3211 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3212 if (*domains
== NULL
) {
3213 ret
= -LTTCOMM_FATAL
;
3217 if (session
->kernel_session
!= NULL
) {
3218 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3222 if (session
->ust_session
!= NULL
) {
3223 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3234 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3236 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3237 struct lttng_channel
**channels
)
3240 ssize_t nb_chan
= 0;
3243 case LTTNG_DOMAIN_KERNEL
:
3244 if (session
->kernel_session
!= NULL
) {
3245 nb_chan
= session
->kernel_session
->channel_count
;
3247 DBG3("Number of kernel channels %zd", nb_chan
);
3249 case LTTNG_DOMAIN_UST
:
3250 if (session
->ust_session
!= NULL
) {
3251 nb_chan
= lttng_ht_get_count(
3252 session
->ust_session
->domain_global
.channels
);
3254 DBG3("Number of UST global channels %zd", nb_chan
);
3263 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3264 if (*channels
== NULL
) {
3265 ret
= -LTTCOMM_FATAL
;
3269 list_lttng_channels(domain
, session
, *channels
);
3281 * Command LTTNG_LIST_EVENTS processed by the client thread.
3283 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3284 char *channel_name
, struct lttng_event
**events
)
3287 ssize_t nb_event
= 0;
3290 case LTTNG_DOMAIN_KERNEL
:
3291 if (session
->kernel_session
!= NULL
) {
3292 nb_event
= list_lttng_kernel_events(channel_name
,
3293 session
->kernel_session
, events
);
3296 case LTTNG_DOMAIN_UST
:
3298 if (session
->ust_session
!= NULL
) {
3299 nb_event
= list_lttng_ust_global_events(channel_name
,
3300 &session
->ust_session
->domain_global
, events
);
3316 * Process the command requested by the lttng client within the command
3317 * context structure. This function make sure that the return structure (llm)
3318 * is set and ready for transmission before returning.
3320 * Return any error encountered or 0 for success.
3322 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3324 int ret
= LTTCOMM_OK
;
3325 int need_tracing_session
= 1;
3328 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3330 switch (cmd_ctx
->lsm
->cmd_type
) {
3331 case LTTNG_CREATE_SESSION
:
3332 case LTTNG_DESTROY_SESSION
:
3333 case LTTNG_LIST_SESSIONS
:
3334 case LTTNG_LIST_DOMAINS
:
3335 case LTTNG_START_TRACE
:
3336 case LTTNG_STOP_TRACE
:
3343 if (opt_no_kernel
&& need_domain
3344 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3346 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3348 ret
= LTTCOMM_KERN_NA
;
3354 * Check for command that don't needs to allocate a returned payload. We do
3355 * this here so we don't have to make the call for no payload at each
3358 switch(cmd_ctx
->lsm
->cmd_type
) {
3359 case LTTNG_LIST_SESSIONS
:
3360 case LTTNG_LIST_TRACEPOINTS
:
3361 case LTTNG_LIST_DOMAINS
:
3362 case LTTNG_LIST_CHANNELS
:
3363 case LTTNG_LIST_EVENTS
:
3366 /* Setup lttng message with no payload */
3367 ret
= setup_lttng_msg(cmd_ctx
, 0);
3369 /* This label does not try to unlock the session */
3370 goto init_setup_error
;
3374 /* Commands that DO NOT need a session. */
3375 switch (cmd_ctx
->lsm
->cmd_type
) {
3376 case LTTNG_CREATE_SESSION
:
3377 case LTTNG_CALIBRATE
:
3378 case LTTNG_LIST_SESSIONS
:
3379 case LTTNG_LIST_TRACEPOINTS
:
3380 need_tracing_session
= 0;
3383 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3385 * We keep the session list lock across _all_ commands
3386 * for now, because the per-session lock does not
3387 * handle teardown properly.
3389 session_lock_list();
3390 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3391 if (cmd_ctx
->session
== NULL
) {
3392 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3393 ret
= LTTCOMM_SESS_NOT_FOUND
;
3395 /* If no session name specified */
3396 ret
= LTTCOMM_SELECT_SESS
;
3400 /* Acquire lock for the session */
3401 session_lock(cmd_ctx
->session
);
3410 * Check domain type for specific "pre-action".
3412 switch (cmd_ctx
->lsm
->domain
.type
) {
3413 case LTTNG_DOMAIN_KERNEL
:
3415 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3419 /* Kernel tracer check */
3420 if (kernel_tracer_fd
== -1) {
3421 /* Basically, load kernel tracer modules */
3422 ret
= init_kernel_tracer();
3428 /* Need a session for kernel command */
3429 if (need_tracing_session
) {
3430 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3431 ret
= create_kernel_session(cmd_ctx
->session
);
3433 ret
= LTTCOMM_KERN_SESS_FAIL
;
3438 /* Start the kernel consumer daemon */
3439 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3440 if (kconsumer_data
.pid
== 0 &&
3441 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3442 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3443 ret
= start_consumerd(&kconsumer_data
);
3445 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3449 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3453 case LTTNG_DOMAIN_UST
:
3455 if (need_tracing_session
) {
3456 if (cmd_ctx
->session
->ust_session
== NULL
) {
3457 ret
= create_ust_session(cmd_ctx
->session
,
3458 &cmd_ctx
->lsm
->domain
);
3459 if (ret
!= LTTCOMM_OK
) {
3463 /* Start the UST consumer daemons */
3465 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3466 if (consumerd64_bin
[0] != '\0' &&
3467 ustconsumer64_data
.pid
== 0 &&
3468 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3469 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3470 ret
= start_consumerd(&ustconsumer64_data
);
3472 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3473 ust_consumerd64_fd
= -EINVAL
;
3477 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3479 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3482 if (consumerd32_bin
[0] != '\0' &&
3483 ustconsumer32_data
.pid
== 0 &&
3484 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3485 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3486 ret
= start_consumerd(&ustconsumer32_data
);
3488 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3489 ust_consumerd32_fd
= -EINVAL
;
3492 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3494 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3505 * Check that the UID or GID match that of the tracing session.
3506 * The root user can interact with all sessions.
3508 if (need_tracing_session
) {
3509 if (!session_access_ok(cmd_ctx
->session
,
3510 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3511 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3512 ret
= LTTCOMM_EPERM
;
3517 /* Process by command type */
3518 switch (cmd_ctx
->lsm
->cmd_type
) {
3519 case LTTNG_ADD_CONTEXT
:
3521 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3522 cmd_ctx
->lsm
->u
.context
.channel_name
,
3523 cmd_ctx
->lsm
->u
.context
.event_name
,
3524 &cmd_ctx
->lsm
->u
.context
.ctx
);
3527 case LTTNG_DISABLE_CHANNEL
:
3529 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3530 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3533 case LTTNG_DISABLE_EVENT
:
3535 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3536 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3537 cmd_ctx
->lsm
->u
.disable
.name
);
3540 case LTTNG_DISABLE_ALL_EVENT
:
3542 DBG("Disabling all events");
3544 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3545 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3548 case LTTNG_ENABLE_CHANNEL
:
3550 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3551 &cmd_ctx
->lsm
->u
.channel
.chan
);
3554 case LTTNG_ENABLE_EVENT
:
3556 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3557 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3558 &cmd_ctx
->lsm
->u
.enable
.event
);
3561 case LTTNG_ENABLE_ALL_EVENT
:
3563 DBG("Enabling all events");
3565 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3566 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3567 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3570 case LTTNG_LIST_TRACEPOINTS
:
3572 struct lttng_event
*events
;
3575 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3576 if (nb_events
< 0) {
3582 * Setup lttng message with payload size set to the event list size in
3583 * bytes and then copy list into the llm payload.
3585 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3591 /* Copy event list into message payload */
3592 memcpy(cmd_ctx
->llm
->payload
, events
,
3593 sizeof(struct lttng_event
) * nb_events
);
3600 case LTTNG_START_TRACE
:
3602 ret
= cmd_start_trace(cmd_ctx
->session
);
3605 case LTTNG_STOP_TRACE
:
3607 ret
= cmd_stop_trace(cmd_ctx
->session
);
3610 case LTTNG_CREATE_SESSION
:
3612 tracepoint(create_session_start
);
3613 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3614 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3615 tracepoint(create_session_end
);
3618 case LTTNG_DESTROY_SESSION
:
3620 tracepoint(destroy_session_start
);
3621 ret
= cmd_destroy_session(cmd_ctx
->session
,
3622 cmd_ctx
->lsm
->session
.name
);
3623 tracepoint(destroy_session_end
);
3625 * Set session to NULL so we do not unlock it after
3628 cmd_ctx
->session
= NULL
;
3631 case LTTNG_LIST_DOMAINS
:
3634 struct lttng_domain
*domains
;
3636 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3642 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3647 /* Copy event list into message payload */
3648 memcpy(cmd_ctx
->llm
->payload
, domains
,
3649 nb_dom
* sizeof(struct lttng_domain
));
3656 case LTTNG_LIST_CHANNELS
:
3659 struct lttng_channel
*channels
;
3661 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3662 cmd_ctx
->session
, &channels
);
3668 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3673 /* Copy event list into message payload */
3674 memcpy(cmd_ctx
->llm
->payload
, channels
,
3675 nb_chan
* sizeof(struct lttng_channel
));
3682 case LTTNG_LIST_EVENTS
:
3685 struct lttng_event
*events
= NULL
;
3687 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3688 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3694 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3699 /* Copy event list into message payload */
3700 memcpy(cmd_ctx
->llm
->payload
, events
,
3701 nb_event
* sizeof(struct lttng_event
));
3708 case LTTNG_LIST_SESSIONS
:
3710 unsigned int nr_sessions
;
3712 session_lock_list();
3713 nr_sessions
= lttng_sessions_count(
3714 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3715 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3717 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3719 session_unlock_list();
3723 /* Filled the session array */
3724 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3725 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3726 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3728 session_unlock_list();
3733 case LTTNG_CALIBRATE
:
3735 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3736 &cmd_ctx
->lsm
->u
.calibrate
);
3739 case LTTNG_REGISTER_CONSUMER
:
3741 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3742 cmd_ctx
->lsm
->u
.reg
.path
);
3751 if (cmd_ctx
->llm
== NULL
) {
3752 DBG("Missing llm structure. Allocating one.");
3753 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3757 /* Set return code */
3758 cmd_ctx
->llm
->ret_code
= ret
;
3760 if (cmd_ctx
->session
) {
3761 session_unlock(cmd_ctx
->session
);
3763 if (need_tracing_session
) {
3764 session_unlock_list();
3771 * This thread manage all clients request using the unix client socket for
3774 static void *thread_manage_clients(void *data
)
3776 int sock
= -1, ret
, i
, pollfd
;
3777 uint32_t revents
, nb_fd
;
3778 struct command_ctx
*cmd_ctx
= NULL
;
3779 struct lttng_poll_event events
;
3781 tracepoint(sessiond_th_cli_start
);
3783 DBG("[thread] Manage client started");
3785 rcu_register_thread();
3787 ret
= lttcomm_listen_unix_sock(client_sock
);
3793 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3794 * more will be added to this poll set.
3796 ret
= create_thread_poll_set(&events
, 2);
3801 /* Add the application registration socket */
3802 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3808 * Notify parent pid that we are ready to accept command for client side.
3810 if (opt_sig_parent
) {
3811 kill(ppid
, SIGUSR1
);
3815 DBG("Accepting client command ...");
3817 tracepoint(sessiond_th_cli_poll
);
3819 nb_fd
= LTTNG_POLL_GETNB(&events
);
3821 /* Inifinite blocking call, waiting for transmission */
3823 ret
= lttng_poll_wait(&events
, -1);
3826 * Restart interrupted system call.
3828 if (errno
== EINTR
) {
3834 for (i
= 0; i
< nb_fd
; i
++) {
3835 /* Fetch once the poll data */
3836 revents
= LTTNG_POLL_GETEV(&events
, i
);
3837 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3839 /* Thread quit pipe has been closed. Killing thread. */
3840 ret
= check_thread_quit_pipe(pollfd
, revents
);
3845 /* Event on the registration socket */
3846 if (pollfd
== client_sock
) {
3847 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3848 ERR("Client socket poll error");
3854 DBG("Wait for client response");
3856 sock
= lttcomm_accept_unix_sock(client_sock
);
3861 /* Set socket option for credentials retrieval */
3862 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3867 /* Allocate context command to process the client request */
3868 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3869 if (cmd_ctx
== NULL
) {
3870 PERROR("zmalloc cmd_ctx");
3874 /* Allocate data buffer for reception */
3875 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3876 if (cmd_ctx
->lsm
== NULL
) {
3877 PERROR("zmalloc cmd_ctx->lsm");
3881 cmd_ctx
->llm
= NULL
;
3882 cmd_ctx
->session
= NULL
;
3885 * Data is received from the lttng client. The struct
3886 * lttcomm_session_msg (lsm) contains the command and data request of
3889 DBG("Receiving data from client ...");
3890 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3891 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3893 DBG("Nothing recv() from client... continuing");
3899 clean_command_ctx(&cmd_ctx
);
3903 // TODO: Validate cmd_ctx including sanity check for
3904 // security purpose.
3906 rcu_thread_online();
3908 * This function dispatch the work to the kernel or userspace tracer
3909 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3910 * informations for the client. The command context struct contains
3911 * everything this function may needs.
3913 ret
= process_client_msg(cmd_ctx
);
3914 rcu_thread_offline();
3917 * TODO: Inform client somehow of the fatal error. At
3918 * this point, ret < 0 means that a zmalloc failed
3919 * (ENOMEM). Error detected but still accept command.
3921 clean_command_ctx(&cmd_ctx
);
3925 DBG("Sending response (size: %d, retcode: %s)",
3926 cmd_ctx
->lttng_msg_size
,
3927 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3928 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3930 ERR("Failed to send data back to client");
3933 /* End of transmission */
3940 clean_command_ctx(&cmd_ctx
);
3944 DBG("Client thread dying");
3945 unlink(client_unix_sock_path
);
3946 if (client_sock
>= 0) {
3947 ret
= close(client_sock
);
3959 lttng_poll_clean(&events
);
3960 clean_command_ctx(&cmd_ctx
);
3962 rcu_unregister_thread();
3968 * usage function on stderr
3970 static void usage(void)
3972 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3973 fprintf(stderr
, " -h, --help Display this usage.\n");
3974 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3975 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3976 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3977 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3978 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3979 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3980 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3981 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3982 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3983 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3984 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3985 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3986 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3987 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3988 fprintf(stderr
, " -V, --version Show version number.\n");
3989 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3990 fprintf(stderr
, " -q, --quiet No output at all.\n");
3991 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3992 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3993 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3997 * daemon argument parsing
3999 static int parse_args(int argc
, char **argv
)
4003 static struct option long_options
[] = {
4004 { "client-sock", 1, 0, 'c' },
4005 { "apps-sock", 1, 0, 'a' },
4006 { "kconsumerd-cmd-sock", 1, 0, 'C' },
4007 { "kconsumerd-err-sock", 1, 0, 'E' },
4008 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
4009 { "ustconsumerd32-err-sock", 1, 0, 'H' },
4010 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
4011 { "ustconsumerd64-err-sock", 1, 0, 'F' },
4012 { "consumerd32-path", 1, 0, 'u' },
4013 { "consumerd32-libdir", 1, 0, 'U' },
4014 { "consumerd64-path", 1, 0, 't' },
4015 { "consumerd64-libdir", 1, 0, 'T' },
4016 { "daemonize", 0, 0, 'd' },
4017 { "sig-parent", 0, 0, 'S' },
4018 { "help", 0, 0, 'h' },
4019 { "group", 1, 0, 'g' },
4020 { "version", 0, 0, 'V' },
4021 { "quiet", 0, 0, 'q' },
4022 { "verbose", 0, 0, 'v' },
4023 { "verbose-consumer", 0, 0, 'Z' },
4024 { "no-kernel", 0, 0, 'N' },
4029 int option_index
= 0;
4030 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
4031 long_options
, &option_index
);
4038 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
4040 fprintf(stderr
, " with arg %s\n", optarg
);
4044 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4047 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4053 opt_tracing_group
= optarg
;
4059 fprintf(stdout
, "%s\n", VERSION
);
4065 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4068 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4071 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4074 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4077 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4080 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4086 lttng_opt_quiet
= 1;
4089 /* Verbose level can increase using multiple -v */
4090 lttng_opt_verbose
+= 1;
4093 opt_verbose_consumer
+= 1;
4096 consumerd32_bin
= optarg
;
4099 consumerd32_libdir
= optarg
;
4102 consumerd64_bin
= optarg
;
4105 consumerd64_libdir
= optarg
;
4108 /* Unknown option or other error.
4109 * Error is printed by getopt, just return */
4118 * Creates the two needed socket by the daemon.
4119 * apps_sock - The communication socket for all UST apps.
4120 * client_sock - The communication of the cli tool (lttng).
4122 static int init_daemon_socket(void)
4127 old_umask
= umask(0);
4129 /* Create client tool unix socket */
4130 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4131 if (client_sock
< 0) {
4132 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4137 /* File permission MUST be 660 */
4138 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4140 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4145 /* Create the application unix socket */
4146 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4147 if (apps_sock
< 0) {
4148 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4153 /* File permission MUST be 666 */
4154 ret
= chmod(apps_unix_sock_path
,
4155 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4157 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4168 * Check if the global socket is available, and if a daemon is answering at the
4169 * other side. If yes, error is returned.
4171 static int check_existing_daemon(void)
4173 /* Is there anybody out there ? */
4174 if (lttng_session_daemon_alive()) {
4182 * Set the tracing group gid onto the client socket.
4184 * Race window between mkdir and chown is OK because we are going from more
4185 * permissive (root.root) to less permissive (root.tracing).
4187 static int set_permissions(char *rundir
)
4192 gid
= allowed_group();
4194 WARN("No tracing group detected");
4199 /* Set lttng run dir */
4200 ret
= chown(rundir
, 0, gid
);
4202 ERR("Unable to set group on %s", rundir
);
4206 /* Ensure tracing group can search the run dir */
4207 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4209 ERR("Unable to set permissions on %s", rundir
);
4213 /* lttng client socket path */
4214 ret
= chown(client_unix_sock_path
, 0, gid
);
4216 ERR("Unable to set group on %s", client_unix_sock_path
);
4220 /* kconsumer error socket path */
4221 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4223 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4227 /* 64-bit ustconsumer error socket path */
4228 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4230 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4234 /* 32-bit ustconsumer compat32 error socket path */
4235 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4237 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4241 DBG("All permissions are set");
4248 * Create the pipe used to wake up the kernel thread.
4249 * Closed in cleanup().
4251 static int create_kernel_poll_pipe(void)
4255 ret
= pipe(kernel_poll_pipe
);
4257 PERROR("kernel poll pipe");
4261 for (i
= 0; i
< 2; i
++) {
4262 ret
= fcntl(kernel_poll_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4264 PERROR("fcntl kernel_poll_pipe");
4274 * Create the application command pipe to wake thread_manage_apps.
4275 * Closed in cleanup().
4277 static int create_apps_cmd_pipe(void)
4281 ret
= pipe(apps_cmd_pipe
);
4283 PERROR("apps cmd pipe");
4287 for (i
= 0; i
< 2; i
++) {
4288 ret
= fcntl(apps_cmd_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4290 PERROR("fcntl apps_cmd_pipe");
4300 * Create the lttng run directory needed for all global sockets and pipe.
4302 static int create_lttng_rundir(const char *rundir
)
4306 DBG3("Creating LTTng run directory: %s", rundir
);
4308 ret
= mkdir(rundir
, S_IRWXU
);
4310 if (errno
!= EEXIST
) {
4311 ERR("Unable to create %s", rundir
);
4323 * Setup sockets and directory needed by the kconsumerd communication with the
4326 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4330 char path
[PATH_MAX
];
4332 switch (consumer_data
->type
) {
4333 case LTTNG_CONSUMER_KERNEL
:
4334 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4336 case LTTNG_CONSUMER64_UST
:
4337 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4339 case LTTNG_CONSUMER32_UST
:
4340 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4343 ERR("Consumer type unknown");
4348 DBG2("Creating consumer directory: %s", path
);
4350 ret
= mkdir(path
, S_IRWXU
);
4352 if (errno
!= EEXIST
) {
4354 ERR("Failed to create %s", path
);
4360 /* Create the kconsumerd error unix socket */
4361 consumer_data
->err_sock
=
4362 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4363 if (consumer_data
->err_sock
< 0) {
4364 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4369 /* File permission MUST be 660 */
4370 ret
= chmod(consumer_data
->err_unix_sock_path
,
4371 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4373 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4383 * Signal handler for the daemon
4385 * Simply stop all worker threads, leaving main() return gracefully after
4386 * joining all threads and calling cleanup().
4388 static void sighandler(int sig
)
4392 DBG("SIGPIPE caught");
4395 DBG("SIGINT caught");
4399 DBG("SIGTERM caught");
4408 * Setup signal handler for :
4409 * SIGINT, SIGTERM, SIGPIPE
4411 static int set_signal_handler(void)
4414 struct sigaction sa
;
4417 if ((ret
= sigemptyset(&sigset
)) < 0) {
4418 PERROR("sigemptyset");
4422 sa
.sa_handler
= sighandler
;
4423 sa
.sa_mask
= sigset
;
4425 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4426 PERROR("sigaction");
4430 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4431 PERROR("sigaction");
4435 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4436 PERROR("sigaction");
4440 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4446 * Set open files limit to unlimited. This daemon can open a large number of
4447 * file descriptors in order to consumer multiple kernel traces.
4449 static void set_ulimit(void)
4454 /* The kernel does not allowed an infinite limit for open files */
4455 lim
.rlim_cur
= 65535;
4456 lim
.rlim_max
= 65535;
4458 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4460 PERROR("failed to set open files limit");
4467 int main(int argc
, char **argv
)
4471 const char *home_path
;
4473 tracepoint(sessiond_boot_start
);
4475 init_kernel_workarounds();
4477 rcu_register_thread();
4479 /* Create thread quit pipe */
4480 if ((ret
= init_thread_quit_pipe()) < 0) {
4484 setup_consumerd_path();
4486 /* Parse arguments */
4488 if ((ret
= parse_args(argc
, argv
) < 0)) {
4501 /* Check if daemon is UID = 0 */
4502 is_root
= !getuid();
4505 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4507 /* Create global run dir with root access */
4508 ret
= create_lttng_rundir(rundir
);
4513 if (strlen(apps_unix_sock_path
) == 0) {
4514 snprintf(apps_unix_sock_path
, PATH_MAX
,
4515 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4518 if (strlen(client_unix_sock_path
) == 0) {
4519 snprintf(client_unix_sock_path
, PATH_MAX
,
4520 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4523 /* Set global SHM for ust */
4524 if (strlen(wait_shm_path
) == 0) {
4525 snprintf(wait_shm_path
, PATH_MAX
,
4526 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4529 /* Setup kernel consumerd path */
4530 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4531 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4532 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4533 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4535 DBG2("Kernel consumer err path: %s",
4536 kconsumer_data
.err_unix_sock_path
);
4537 DBG2("Kernel consumer cmd path: %s",
4538 kconsumer_data
.cmd_unix_sock_path
);
4540 home_path
= get_home_dir();
4541 if (home_path
== NULL
) {
4542 /* TODO: Add --socket PATH option */
4543 ERR("Can't get HOME directory for sockets creation.");
4549 * Create rundir from home path. This will create something like
4552 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4558 ret
= create_lttng_rundir(rundir
);
4563 if (strlen(apps_unix_sock_path
) == 0) {
4564 snprintf(apps_unix_sock_path
, PATH_MAX
,
4565 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4568 /* Set the cli tool unix socket path */
4569 if (strlen(client_unix_sock_path
) == 0) {
4570 snprintf(client_unix_sock_path
, PATH_MAX
,
4571 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4574 /* Set global SHM for ust */
4575 if (strlen(wait_shm_path
) == 0) {
4576 snprintf(wait_shm_path
, PATH_MAX
,
4577 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4581 DBG("Client socket path %s", client_unix_sock_path
);
4582 DBG("Application socket path %s", apps_unix_sock_path
);
4583 DBG("LTTng run directory path: %s", rundir
);
4585 /* 32 bits consumerd path setup */
4586 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4587 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4588 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4589 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4591 DBG2("UST consumer 32 bits err path: %s",
4592 ustconsumer32_data
.err_unix_sock_path
);
4593 DBG2("UST consumer 32 bits cmd path: %s",
4594 ustconsumer32_data
.cmd_unix_sock_path
);
4596 /* 64 bits consumerd path setup */
4597 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4598 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4599 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4600 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4602 DBG2("UST consumer 64 bits err path: %s",
4603 ustconsumer64_data
.err_unix_sock_path
);
4604 DBG2("UST consumer 64 bits cmd path: %s",
4605 ustconsumer64_data
.cmd_unix_sock_path
);
4608 * See if daemon already exist.
4610 if ((ret
= check_existing_daemon()) < 0) {
4611 ERR("Already running daemon.\n");
4613 * We do not goto exit because we must not cleanup()
4614 * because a daemon is already running.
4620 * Init UST app hash table. Alloc hash table before this point since
4621 * cleanup() can get called after that point.
4625 /* After this point, we can safely call cleanup() with "goto exit" */
4628 * These actions must be executed as root. We do that *after* setting up
4629 * the sockets path because we MUST make the check for another daemon using
4630 * those paths *before* trying to set the kernel consumer sockets and init
4634 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4639 /* Setup kernel tracer */
4640 if (!opt_no_kernel
) {
4641 init_kernel_tracer();
4644 /* Set ulimit for open files */
4647 /* init lttng_fd tracking must be done after set_ulimit. */
4650 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4655 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4660 if ((ret
= set_signal_handler()) < 0) {
4664 /* Setup the needed unix socket */
4665 if ((ret
= init_daemon_socket()) < 0) {
4669 /* Set credentials to socket */
4670 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4674 /* Get parent pid if -S, --sig-parent is specified. */
4675 if (opt_sig_parent
) {
4679 /* Setup the kernel pipe for waking up the kernel thread */
4680 if ((ret
= create_kernel_poll_pipe()) < 0) {
4684 /* Setup the thread apps communication pipe. */
4685 if ((ret
= create_apps_cmd_pipe()) < 0) {
4689 /* Init UST command queue. */
4690 cds_wfq_init(&ust_cmd_queue
.queue
);
4693 * Get session list pointer. This pointer MUST NOT be free(). This list is
4694 * statically declared in session.c
4696 session_list_ptr
= session_get_list();
4698 /* Set up max poll set size */
4699 lttng_poll_set_max_size();
4701 /* Create thread to manage the client socket */
4702 ret
= pthread_create(&client_thread
, NULL
,
4703 thread_manage_clients
, (void *) NULL
);
4705 PERROR("pthread_create clients");
4709 /* Create thread to dispatch registration */
4710 ret
= pthread_create(&dispatch_thread
, NULL
,
4711 thread_dispatch_ust_registration
, (void *) NULL
);
4713 PERROR("pthread_create dispatch");
4717 /* Create thread to manage application registration. */
4718 ret
= pthread_create(®_apps_thread
, NULL
,
4719 thread_registration_apps
, (void *) NULL
);
4721 PERROR("pthread_create registration");
4725 /* Create thread to manage application socket */
4726 ret
= pthread_create(&apps_thread
, NULL
,
4727 thread_manage_apps
, (void *) NULL
);
4729 PERROR("pthread_create apps");
4733 /* Create kernel thread to manage kernel event */
4734 ret
= pthread_create(&kernel_thread
, NULL
,
4735 thread_manage_kernel
, (void *) NULL
);
4737 PERROR("pthread_create kernel");
4741 tracepoint(sessiond_boot_end
);
4743 ret
= pthread_join(kernel_thread
, &status
);
4745 PERROR("pthread_join");
4746 goto error
; /* join error, exit without cleanup */
4750 ret
= pthread_join(apps_thread
, &status
);
4752 PERROR("pthread_join");
4753 goto error
; /* join error, exit without cleanup */
4757 ret
= pthread_join(reg_apps_thread
, &status
);
4759 PERROR("pthread_join");
4760 goto error
; /* join error, exit without cleanup */
4764 ret
= pthread_join(dispatch_thread
, &status
);
4766 PERROR("pthread_join");
4767 goto error
; /* join error, exit without cleanup */
4771 ret
= pthread_join(client_thread
, &status
);
4773 PERROR("pthread_join");
4774 goto error
; /* join error, exit without cleanup */
4777 ret
= join_consumer_thread(&kconsumer_data
);
4779 PERROR("join_consumer");
4780 goto error
; /* join error, exit without cleanup */
4786 * cleanup() is called when no other thread is running.
4788 rcu_thread_online();
4790 rcu_thread_offline();
4791 rcu_unregister_thread();