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
];
80 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
81 const char default_tracing_group
[] = DEFAULT_TRACING_GROUP
;
82 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
83 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
86 const char *opt_tracing_group
;
87 static int opt_sig_parent
;
88 static int opt_verbose_consumer
;
89 static int opt_daemon
;
90 static int opt_no_kernel
;
91 static int is_root
; /* Set to 1 if the daemon is running as root */
92 static pid_t ppid
; /* Parent PID for --sig-parent option */
95 /* Consumer daemon specific control data */
96 static struct consumer_data kconsumer_data
= {
97 .type
= LTTNG_CONSUMER_KERNEL
,
98 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
99 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
103 static struct consumer_data ustconsumer64_data
= {
104 .type
= LTTNG_CONSUMER64_UST
,
105 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
106 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
110 static struct consumer_data ustconsumer32_data
= {
111 .type
= LTTNG_CONSUMER32_UST
,
112 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
113 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
118 static int dispatch_thread_exit
;
120 /* Global application Unix socket path */
121 static char apps_unix_sock_path
[PATH_MAX
];
122 /* Global client Unix socket path */
123 static char client_unix_sock_path
[PATH_MAX
];
124 /* global wait shm path for UST */
125 static char wait_shm_path
[PATH_MAX
];
127 /* Sockets and FDs */
128 static int client_sock
= -1;
129 static int apps_sock
= -1;
130 static int kernel_tracer_fd
= -1;
131 static int kernel_poll_pipe
[2] = { -1, -1 };
134 * Quit pipe for all threads. This permits a single cancellation point
135 * for all threads when receiving an event on the pipe.
137 static int thread_quit_pipe
[2] = { -1, -1 };
140 * This pipe is used to inform the thread managing application communication
141 * that a command is queued and ready to be processed.
143 static int apps_cmd_pipe
[2] = { -1, -1 };
145 /* Pthread, Mutexes and Semaphores */
146 static pthread_t apps_thread
;
147 static pthread_t reg_apps_thread
;
148 static pthread_t client_thread
;
149 static pthread_t kernel_thread
;
150 static pthread_t dispatch_thread
;
154 * UST registration command queue. This queue is tied with a futex and uses a N
155 * wakers / 1 waiter implemented and detailed in futex.c/.h
157 * The thread_manage_apps and thread_dispatch_ust_registration interact with
158 * this queue and the wait/wake scheme.
160 static struct ust_cmd_queue ust_cmd_queue
;
163 * Pointer initialized before thread creation.
165 * This points to the tracing session list containing the session count and a
166 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
167 * MUST NOT be taken if you call a public function in session.c.
169 * The lock is nested inside the structure: session_list_ptr->lock. Please use
170 * session_lock_list and session_unlock_list for lock acquisition.
172 static struct ltt_session_list
*session_list_ptr
;
174 int ust_consumerd64_fd
= -1;
175 int ust_consumerd32_fd
= -1;
177 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
178 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
179 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
180 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
183 void setup_consumerd_path(void)
185 const char *bin
, *libdir
;
188 * Allow INSTALL_BIN_PATH to be used as a target path for the
189 * native architecture size consumer if CONFIG_CONSUMER*_PATH
190 * has not been defined.
192 #if (CAA_BITS_PER_LONG == 32)
193 if (!consumerd32_bin
[0]) {
194 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
196 if (!consumerd32_libdir
[0]) {
197 consumerd32_libdir
= INSTALL_LIB_PATH
;
199 #elif (CAA_BITS_PER_LONG == 64)
200 if (!consumerd64_bin
[0]) {
201 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
203 if (!consumerd64_libdir
[0]) {
204 consumerd64_libdir
= INSTALL_LIB_PATH
;
207 #error "Unknown bitness"
211 * runtime env. var. overrides the build default.
213 bin
= getenv("LTTNG_CONSUMERD32_BIN");
215 consumerd32_bin
= bin
;
217 bin
= getenv("LTTNG_CONSUMERD64_BIN");
219 consumerd64_bin
= bin
;
221 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
223 consumerd32_libdir
= libdir
;
225 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
227 consumerd64_libdir
= libdir
;
232 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 static int create_thread_poll_set(struct lttng_poll_event
*events
,
239 if (events
== NULL
|| size
== 0) {
244 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
250 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
262 * Check if the thread quit pipe was triggered.
264 * Return 1 if it was triggered else 0;
266 static int check_thread_quit_pipe(int fd
, uint32_t events
)
268 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
276 * Return group ID of the tracing group or -1 if not found.
278 static gid_t
allowed_group(void)
282 if (opt_tracing_group
) {
283 grp
= getgrnam(opt_tracing_group
);
285 grp
= getgrnam(default_tracing_group
);
295 * Init thread quit pipe.
297 * Return -1 on error or 0 if all pipes are created.
299 static int init_thread_quit_pipe(void)
303 ret
= pipe(thread_quit_pipe
);
305 PERROR("thread quit pipe");
309 for (i
= 0; i
< 2; i
++) {
310 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
322 * Complete teardown of a kernel session. This free all data structure related
323 * to a kernel session and update counter.
325 static void teardown_kernel_session(struct ltt_session
*session
)
327 if (!session
->kernel_session
) {
328 DBG3("No kernel session when tearing down session");
332 DBG("Tearing down kernel session");
335 * If a custom kernel consumer was registered, close the socket before
336 * tearing down the complete kernel session structure
338 if (kconsumer_data
.cmd_sock
>= 0 &&
339 session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
340 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
343 trace_kernel_destroy_session(session
->kernel_session
);
347 * Complete teardown of all UST sessions. This will free everything on his path
348 * and destroy the core essence of all ust sessions :)
350 static void teardown_ust_session(struct ltt_session
*session
)
354 if (!session
->ust_session
) {
355 DBG3("No UST session when tearing down session");
359 DBG("Tearing down UST session(s)");
361 ret
= ust_app_destroy_trace_all(session
->ust_session
);
363 ERR("Error in ust_app_destroy_trace_all");
366 trace_ust_destroy_session(session
->ust_session
);
370 * Stop all threads by closing the thread quit pipe.
372 static void stop_threads(void)
376 /* Stopping all threads */
377 DBG("Terminating all threads");
378 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
380 ERR("write error on thread quit pipe");
383 /* Dispatch thread */
384 dispatch_thread_exit
= 1;
385 futex_nto1_wake(&ust_cmd_queue
.futex
);
391 static void cleanup(void)
395 struct ltt_session
*sess
, *stmp
;
399 DBG("Removing %s directory", rundir
);
400 ret
= asprintf(&cmd
, "rm -rf %s", rundir
);
402 ERR("asprintf failed. Something is really wrong!");
405 /* Remove lttng run directory */
408 ERR("Unable to clean %s", rundir
);
412 DBG("Cleaning up all sessions");
414 /* Destroy session list mutex */
415 if (session_list_ptr
!= NULL
) {
416 pthread_mutex_destroy(&session_list_ptr
->lock
);
418 /* Cleanup ALL session */
419 cds_list_for_each_entry_safe(sess
, stmp
,
420 &session_list_ptr
->head
, list
) {
421 teardown_kernel_session(sess
);
422 teardown_ust_session(sess
);
427 DBG("Closing all UST sockets");
428 ust_app_clean_list();
430 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
432 if (is_root
&& !opt_no_kernel
) {
433 DBG2("Closing kernel fd");
434 if (kernel_tracer_fd
>= 0) {
435 ret
= close(kernel_tracer_fd
);
440 DBG("Unloading kernel modules");
441 modprobe_remove_lttng_all();
445 * Closing all pipes used for communication between threads.
447 for (i
= 0; i
< 2; i
++) {
448 if (kernel_poll_pipe
[i
] >= 0) {
449 ret
= close(kernel_poll_pipe
[i
]);
456 for (i
= 0; i
< 2; i
++) {
457 if (thread_quit_pipe
[i
] >= 0) {
458 ret
= close(thread_quit_pipe
[i
]);
464 for (i
= 0; i
< 2; i
++) {
465 if (apps_cmd_pipe
[i
] >= 0) {
466 ret
= close(apps_cmd_pipe
[i
]);
474 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
475 "Matthew, BEET driven development works!%c[%dm",
476 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
481 * Send data on a unix socket using the liblttsessiondcomm API.
483 * Return lttcomm error code.
485 static int send_unix_sock(int sock
, void *buf
, size_t len
)
487 /* Check valid length */
492 return lttcomm_send_unix_sock(sock
, buf
, len
);
496 * Free memory of a command context structure.
498 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
500 DBG("Clean command context structure");
502 if ((*cmd_ctx
)->llm
) {
503 free((*cmd_ctx
)->llm
);
505 if ((*cmd_ctx
)->lsm
) {
506 free((*cmd_ctx
)->lsm
);
514 * Send all stream fds of kernel channel to the consumer.
516 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
517 int sock
, struct ltt_kernel_channel
*channel
,
518 uid_t uid
, gid_t gid
)
521 struct ltt_kernel_stream
*stream
;
522 struct lttcomm_consumer_msg lkm
;
524 DBG("Sending streams of channel %s to kernel consumer",
525 channel
->channel
->name
);
528 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
529 lkm
.u
.channel
.channel_key
= channel
->fd
;
530 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
531 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
532 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
533 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
535 PERROR("send consumer channel");
540 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
544 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
545 lkm
.u
.stream
.channel_key
= channel
->fd
;
546 lkm
.u
.stream
.stream_key
= stream
->fd
;
547 lkm
.u
.stream
.state
= stream
->state
;
548 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
549 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
550 lkm
.u
.stream
.uid
= uid
;
551 lkm
.u
.stream
.gid
= gid
;
552 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
553 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
554 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
555 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
557 PERROR("send consumer stream");
560 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
562 PERROR("send consumer stream ancillary data");
567 DBG("consumer channel streams sent");
576 * Send all stream fds of the kernel session to the consumer.
578 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
579 struct ltt_kernel_session
*session
)
582 struct ltt_kernel_channel
*chan
;
583 struct lttcomm_consumer_msg lkm
;
584 int sock
= session
->consumer_fd
;
586 DBG("Sending metadata stream fd");
588 /* Extra protection. It's NOT supposed to be set to -1 at this point */
589 if (session
->consumer_fd
< 0) {
590 session
->consumer_fd
= consumer_data
->cmd_sock
;
593 if (session
->metadata_stream_fd
>= 0) {
594 /* Send metadata channel fd */
595 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
596 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
597 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
598 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
599 DBG("Sending metadata channel %d to consumer", lkm
.u
.channel
.channel_key
);
600 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
602 PERROR("send consumer channel");
606 /* Send metadata stream fd */
607 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
608 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
609 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
610 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
611 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
612 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
613 lkm
.u
.stream
.uid
= session
->uid
;
614 lkm
.u
.stream
.gid
= session
->gid
;
615 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
616 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
617 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
618 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
620 PERROR("send consumer stream");
623 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
625 PERROR("send consumer stream");
630 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
631 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
,
632 session
->uid
, session
->gid
);
638 DBG("consumer fds (metadata and channel streams) sent");
647 * Notify UST applications using the shm mmap futex.
649 static int notify_ust_apps(int active
)
653 DBG("Notifying applications of session daemon state: %d", active
);
655 /* See shm.c for this call implying mmap, shm and futex calls */
656 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
657 if (wait_shm_mmap
== NULL
) {
661 /* Wake waiting process */
662 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
664 /* Apps notified successfully */
672 * Setup the outgoing data buffer for the response (llm) by allocating the
673 * right amount of memory and copying the original information from the lsm
676 * Return total size of the buffer pointed by buf.
678 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
684 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
685 if (cmd_ctx
->llm
== NULL
) {
691 /* Copy common data */
692 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
693 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
695 cmd_ctx
->llm
->data_size
= size
;
696 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
705 * Update the kernel poll set of all channel fd available over all tracing
706 * session. Add the wakeup pipe at the end of the set.
708 static int update_kernel_poll(struct lttng_poll_event
*events
)
711 struct ltt_session
*session
;
712 struct ltt_kernel_channel
*channel
;
714 DBG("Updating kernel poll set");
717 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
718 session_lock(session
);
719 if (session
->kernel_session
== NULL
) {
720 session_unlock(session
);
724 cds_list_for_each_entry(channel
,
725 &session
->kernel_session
->channel_list
.head
, list
) {
726 /* Add channel fd to the kernel poll set */
727 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
729 session_unlock(session
);
732 DBG("Channel fd %d added to kernel set", channel
->fd
);
734 session_unlock(session
);
736 session_unlock_list();
741 session_unlock_list();
746 * Find the channel fd from 'fd' over all tracing session. When found, check
747 * for new channel stream and send those stream fds to the kernel consumer.
749 * Useful for CPU hotplug feature.
751 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
754 struct ltt_session
*session
;
755 struct ltt_kernel_channel
*channel
;
757 DBG("Updating kernel streams for channel fd %d", fd
);
760 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
761 session_lock(session
);
762 if (session
->kernel_session
== NULL
) {
763 session_unlock(session
);
767 /* This is not suppose to be -1 but this is an extra security check */
768 if (session
->kernel_session
->consumer_fd
< 0) {
769 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
772 cds_list_for_each_entry(channel
,
773 &session
->kernel_session
->channel_list
.head
, list
) {
774 if (channel
->fd
== fd
) {
775 DBG("Channel found, updating kernel streams");
776 ret
= kernel_open_channel_stream(channel
);
782 * Have we already sent fds to the consumer? If yes, it means
783 * that tracing is started so it is safe to send our updated
786 if (session
->kernel_session
->consumer_fds_sent
== 1) {
787 ret
= send_kconsumer_channel_streams(consumer_data
,
788 session
->kernel_session
->consumer_fd
, channel
,
789 session
->uid
, session
->gid
);
797 session_unlock(session
);
799 session_unlock_list();
803 session_unlock(session
);
804 session_unlock_list();
809 * For each tracing session, update newly registered apps.
811 static void update_ust_app(int app_sock
)
813 struct ltt_session
*sess
, *stmp
;
817 /* For all tracing session(s) */
818 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
820 if (sess
->ust_session
) {
821 ust_app_global_update(sess
->ust_session
, app_sock
);
823 session_unlock(sess
);
826 session_unlock_list();
830 * This thread manage event coming from the kernel.
832 * Features supported in this thread:
835 static void *thread_manage_kernel(void *data
)
837 int ret
, i
, pollfd
, update_poll_flag
= 1;
838 uint32_t revents
, nb_fd
;
840 struct lttng_poll_event events
;
842 DBG("Thread manage kernel started");
844 ret
= create_thread_poll_set(&events
, 2);
846 goto error_poll_create
;
849 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
855 if (update_poll_flag
== 1) {
857 * Reset number of fd in the poll set. Always 2 since there is the thread
858 * quit pipe and the kernel pipe.
862 ret
= update_kernel_poll(&events
);
866 update_poll_flag
= 0;
869 nb_fd
= LTTNG_POLL_GETNB(&events
);
871 DBG("Thread kernel polling on %d fds", nb_fd
);
873 /* Zeroed the poll events */
874 lttng_poll_reset(&events
);
876 /* Poll infinite value of time */
878 ret
= lttng_poll_wait(&events
, -1);
881 * Restart interrupted system call.
883 if (errno
== EINTR
) {
887 } else if (ret
== 0) {
888 /* Should not happen since timeout is infinite */
889 ERR("Return value of poll is 0 with an infinite timeout.\n"
890 "This should not have happened! Continuing...");
894 for (i
= 0; i
< nb_fd
; i
++) {
895 /* Fetch once the poll data */
896 revents
= LTTNG_POLL_GETEV(&events
, i
);
897 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
899 /* Thread quit pipe has been closed. Killing thread. */
900 ret
= check_thread_quit_pipe(pollfd
, revents
);
905 /* Check for data on kernel pipe */
906 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
907 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
908 update_poll_flag
= 1;
912 * New CPU detected by the kernel. Adding kernel stream to
913 * kernel session and updating the kernel consumer
915 if (revents
& LPOLLIN
) {
916 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
922 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
923 * and unregister kernel stream at this point.
931 lttng_poll_clean(&events
);
933 DBG("Kernel thread dying");
938 * This thread manage the consumer error sent back to the session daemon.
940 static void *thread_manage_consumer(void *data
)
942 int sock
= -1, i
, ret
, pollfd
;
943 uint32_t revents
, nb_fd
;
944 enum lttcomm_return_code code
;
945 struct lttng_poll_event events
;
946 struct consumer_data
*consumer_data
= data
;
948 DBG("[thread] Manage consumer started");
950 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
956 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
957 * Nothing more will be added to this poll set.
959 ret
= create_thread_poll_set(&events
, 2);
964 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
969 nb_fd
= LTTNG_POLL_GETNB(&events
);
971 /* Inifinite blocking call, waiting for transmission */
973 ret
= lttng_poll_wait(&events
, -1);
976 * Restart interrupted system call.
978 if (errno
== EINTR
) {
984 for (i
= 0; i
< nb_fd
; i
++) {
985 /* Fetch once the poll data */
986 revents
= LTTNG_POLL_GETEV(&events
, i
);
987 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
989 /* Thread quit pipe has been closed. Killing thread. */
990 ret
= check_thread_quit_pipe(pollfd
, revents
);
995 /* Event on the registration socket */
996 if (pollfd
== consumer_data
->err_sock
) {
997 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
998 ERR("consumer err socket poll error");
1004 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1009 DBG2("Receiving code from consumer err_sock");
1011 /* Getting status code from kconsumerd */
1012 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1013 sizeof(enum lttcomm_return_code
));
1018 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
1019 consumer_data
->cmd_sock
=
1020 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1021 if (consumer_data
->cmd_sock
< 0) {
1022 sem_post(&consumer_data
->sem
);
1023 PERROR("consumer connect");
1026 /* Signal condition to tell that the kconsumerd is ready */
1027 sem_post(&consumer_data
->sem
);
1028 DBG("consumer command socket ready");
1030 ERR("consumer error when waiting for SOCK_READY : %s",
1031 lttcomm_get_readable_code(-code
));
1035 /* Remove the kconsumerd error sock since we've established a connexion */
1036 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1041 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1046 /* Update number of fd */
1047 nb_fd
= LTTNG_POLL_GETNB(&events
);
1049 /* Inifinite blocking call, waiting for transmission */
1051 ret
= lttng_poll_wait(&events
, -1);
1054 * Restart interrupted system call.
1056 if (errno
== EINTR
) {
1062 for (i
= 0; i
< nb_fd
; i
++) {
1063 /* Fetch once the poll data */
1064 revents
= LTTNG_POLL_GETEV(&events
, i
);
1065 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1067 /* Thread quit pipe has been closed. Killing thread. */
1068 ret
= check_thread_quit_pipe(pollfd
, revents
);
1073 /* Event on the kconsumerd socket */
1074 if (pollfd
== sock
) {
1075 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1076 ERR("consumer err socket second poll error");
1082 /* Wait for any kconsumerd error */
1083 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1084 sizeof(enum lttcomm_return_code
));
1086 ERR("consumer closed the command socket");
1090 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1093 if (consumer_data
->err_sock
>= 0) {
1094 ret
= close(consumer_data
->err_sock
);
1099 if (consumer_data
->cmd_sock
>= 0) {
1100 ret
= close(consumer_data
->cmd_sock
);
1112 unlink(consumer_data
->err_unix_sock_path
);
1113 unlink(consumer_data
->cmd_unix_sock_path
);
1114 consumer_data
->pid
= 0;
1116 lttng_poll_clean(&events
);
1119 DBG("consumer thread cleanup completed");
1125 * This thread manage application communication.
1127 static void *thread_manage_apps(void *data
)
1130 uint32_t revents
, nb_fd
;
1131 struct ust_command ust_cmd
;
1132 struct lttng_poll_event events
;
1134 DBG("[thread] Manage application started");
1136 rcu_register_thread();
1137 rcu_thread_online();
1139 ret
= create_thread_poll_set(&events
, 2);
1141 goto error_poll_create
;
1144 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1150 /* Zeroed the events structure */
1151 lttng_poll_reset(&events
);
1153 nb_fd
= LTTNG_POLL_GETNB(&events
);
1155 DBG("Apps thread polling on %d fds", nb_fd
);
1157 /* Inifinite blocking call, waiting for transmission */
1159 ret
= lttng_poll_wait(&events
, -1);
1162 * Restart interrupted system call.
1164 if (errno
== EINTR
) {
1170 for (i
= 0; i
< nb_fd
; i
++) {
1171 /* Fetch once the poll data */
1172 revents
= LTTNG_POLL_GETEV(&events
, i
);
1173 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1175 /* Thread quit pipe has been closed. Killing thread. */
1176 ret
= check_thread_quit_pipe(pollfd
, revents
);
1181 /* Inspect the apps cmd pipe */
1182 if (pollfd
== apps_cmd_pipe
[0]) {
1183 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1184 ERR("Apps command pipe error");
1186 } else if (revents
& LPOLLIN
) {
1188 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1189 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1190 PERROR("read apps cmd pipe");
1194 /* Register applicaton to the session daemon */
1195 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1197 if (ret
== -ENOMEM
) {
1199 } else if (ret
< 0) {
1204 * Validate UST version compatibility.
1206 ret
= ust_app_validate_version(ust_cmd
.sock
);
1209 * Add channel(s) and event(s) to newly registered apps
1210 * from lttng global UST domain.
1212 update_ust_app(ust_cmd
.sock
);
1215 ret
= ust_app_register_done(ust_cmd
.sock
);
1218 * If the registration is not possible, we simply
1219 * unregister the apps and continue
1221 ust_app_unregister(ust_cmd
.sock
);
1224 * We just need here to monitor the close of the UST
1225 * socket and poll set monitor those by default.
1226 * Listen on POLLIN (even if we never expect any
1227 * data) to ensure that hangup wakes us.
1229 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, LPOLLIN
);
1234 DBG("Apps with sock %d added to poll set",
1242 * At this point, we know that a registered application made
1243 * the event at poll_wait.
1245 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1246 /* Removing from the poll set */
1247 ret
= lttng_poll_del(&events
, pollfd
);
1252 /* Socket closed on remote end. */
1253 ust_app_unregister(pollfd
);
1261 lttng_poll_clean(&events
);
1263 DBG("Application communication apps thread cleanup complete");
1264 rcu_thread_offline();
1265 rcu_unregister_thread();
1270 * Dispatch request from the registration threads to the application
1271 * communication thread.
1273 static void *thread_dispatch_ust_registration(void *data
)
1276 struct cds_wfq_node
*node
;
1277 struct ust_command
*ust_cmd
= NULL
;
1279 DBG("[thread] Dispatch UST command started");
1281 while (!dispatch_thread_exit
) {
1282 /* Atomically prepare the queue futex */
1283 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1286 /* Dequeue command for registration */
1287 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1289 DBG("Woken up but nothing in the UST command queue");
1290 /* Continue thread execution */
1294 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1296 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1297 " gid:%d sock:%d name:%s (version %d.%d)",
1298 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1299 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1300 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1301 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1303 * Inform apps thread of the new application registration. This
1304 * call is blocking so we can be assured that the data will be read
1305 * at some point in time or wait to the end of the world :)
1307 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1308 sizeof(struct ust_command
));
1310 PERROR("write apps cmd pipe");
1311 if (errno
== EBADF
) {
1313 * We can't inform the application thread to process
1314 * registration. We will exit or else application
1315 * registration will not occur and tracing will never
1322 } while (node
!= NULL
);
1324 /* Futex wait on queue. Blocking call on futex() */
1325 futex_nto1_wait(&ust_cmd_queue
.futex
);
1329 DBG("Dispatch thread dying");
1334 * This thread manage application registration.
1336 static void *thread_registration_apps(void *data
)
1338 int sock
= -1, i
, ret
, pollfd
;
1339 uint32_t revents
, nb_fd
;
1340 struct lttng_poll_event events
;
1342 * Get allocated in this thread, enqueued to a global queue, dequeued and
1343 * freed in the manage apps thread.
1345 struct ust_command
*ust_cmd
= NULL
;
1347 DBG("[thread] Manage application registration started");
1349 ret
= lttcomm_listen_unix_sock(apps_sock
);
1355 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1356 * more will be added to this poll set.
1358 ret
= create_thread_poll_set(&events
, 2);
1360 goto error_create_poll
;
1363 /* Add the application registration socket */
1364 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1366 goto error_poll_add
;
1369 /* Notify all applications to register */
1370 ret
= notify_ust_apps(1);
1372 ERR("Failed to notify applications or create the wait shared memory.\n"
1373 "Execution continues but there might be problem for already\n"
1374 "running applications that wishes to register.");
1378 DBG("Accepting application registration");
1380 nb_fd
= LTTNG_POLL_GETNB(&events
);
1382 /* Inifinite blocking call, waiting for transmission */
1384 ret
= lttng_poll_wait(&events
, -1);
1387 * Restart interrupted system call.
1389 if (errno
== EINTR
) {
1395 for (i
= 0; i
< nb_fd
; i
++) {
1396 /* Fetch once the poll data */
1397 revents
= LTTNG_POLL_GETEV(&events
, i
);
1398 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1400 /* Thread quit pipe has been closed. Killing thread. */
1401 ret
= check_thread_quit_pipe(pollfd
, revents
);
1406 /* Event on the registration socket */
1407 if (pollfd
== apps_sock
) {
1408 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1409 ERR("Register apps socket poll error");
1411 } else if (revents
& LPOLLIN
) {
1412 sock
= lttcomm_accept_unix_sock(apps_sock
);
1417 /* Create UST registration command for enqueuing */
1418 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1419 if (ust_cmd
== NULL
) {
1420 PERROR("ust command zmalloc");
1425 * Using message-based transmissions to ensure we don't
1426 * have to deal with partially received messages.
1428 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
1430 ERR("Exhausted file descriptors allowed for applications.");
1439 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1440 sizeof(struct ust_register_msg
));
1441 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1443 PERROR("lttcomm_recv_unix_sock register apps");
1445 ERR("Wrong size received on apps register");
1452 lttng_fd_put(LTTNG_FD_APPS
, 1);
1457 ust_cmd
->sock
= sock
;
1460 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1461 " gid:%d sock:%d name:%s (version %d.%d)",
1462 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1463 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1464 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1465 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1468 * Lock free enqueue the registration request. The red pill
1469 * has been taken! This apps will be part of the *system*.
1471 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1474 * Wake the registration queue futex. Implicit memory
1475 * barrier with the exchange in cds_wfq_enqueue.
1477 futex_nto1_wake(&ust_cmd_queue
.futex
);
1484 /* Notify that the registration thread is gone */
1487 if (apps_sock
>= 0) {
1488 ret
= close(apps_sock
);
1498 lttng_fd_put(LTTNG_FD_APPS
, 1);
1500 unlink(apps_unix_sock_path
);
1503 lttng_poll_clean(&events
);
1506 DBG("UST Registration thread cleanup complete");
1512 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1513 * exec or it will fails.
1515 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1518 struct timespec timeout
;
1520 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1521 timeout
.tv_nsec
= 0;
1523 /* Setup semaphore */
1524 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1526 PERROR("sem_init consumer semaphore");
1530 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1531 thread_manage_consumer
, consumer_data
);
1533 PERROR("pthread_create consumer");
1538 /* Get time for sem_timedwait absolute timeout */
1539 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1541 PERROR("clock_gettime spawn consumer");
1542 /* Infinite wait for the kconsumerd thread to be ready */
1543 ret
= sem_wait(&consumer_data
->sem
);
1545 /* Normal timeout if the gettime was successful */
1546 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1547 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1551 if (errno
== ETIMEDOUT
) {
1553 * Call has timed out so we kill the kconsumerd_thread and return
1556 ERR("The consumer thread was never ready. Killing it");
1557 ret
= pthread_cancel(consumer_data
->thread
);
1559 PERROR("pthread_cancel consumer thread");
1562 PERROR("semaphore wait failed consumer thread");
1567 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1568 if (consumer_data
->pid
== 0) {
1569 ERR("Kconsumerd did not start");
1570 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1573 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1582 * Join consumer thread
1584 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1589 if (consumer_data
->pid
!= 0) {
1590 ret
= kill(consumer_data
->pid
, SIGTERM
);
1592 ERR("Error killing consumer daemon");
1595 return pthread_join(consumer_data
->thread
, &status
);
1602 * Fork and exec a consumer daemon (consumerd).
1604 * Return pid if successful else -1.
1606 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1610 const char *consumer_to_use
;
1611 const char *verbosity
;
1614 DBG("Spawning consumerd");
1621 if (opt_verbose_consumer
) {
1622 verbosity
= "--verbose";
1624 verbosity
= "--quiet";
1626 switch (consumer_data
->type
) {
1627 case LTTNG_CONSUMER_KERNEL
:
1629 * Find out which consumerd to execute. We will first try the
1630 * 64-bit path, then the sessiond's installation directory, and
1631 * fallback on the 32-bit one,
1633 DBG3("Looking for a kernel consumer at these locations:");
1634 DBG3(" 1) %s", consumerd64_bin
);
1635 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
1636 DBG3(" 3) %s", consumerd32_bin
);
1637 if (stat(consumerd64_bin
, &st
) == 0) {
1638 DBG3("Found location #1");
1639 consumer_to_use
= consumerd64_bin
;
1640 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
1641 DBG3("Found location #2");
1642 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
1643 } else if (stat(consumerd32_bin
, &st
) == 0) {
1644 DBG3("Found location #3");
1645 consumer_to_use
= consumerd32_bin
;
1647 DBG("Could not find any valid consumerd executable");
1650 DBG("Using kernel consumer at: %s", consumer_to_use
);
1651 execl(consumer_to_use
,
1652 "lttng-consumerd", verbosity
, "-k",
1653 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1654 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1657 case LTTNG_CONSUMER64_UST
:
1659 char *tmpnew
= NULL
;
1661 if (consumerd64_libdir
[0] != '\0') {
1665 tmp
= getenv("LD_LIBRARY_PATH");
1669 tmplen
= strlen("LD_LIBRARY_PATH=")
1670 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
1671 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1676 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1677 strcat(tmpnew
, consumerd64_libdir
);
1678 if (tmp
[0] != '\0') {
1679 strcat(tmpnew
, ":");
1680 strcat(tmpnew
, tmp
);
1682 ret
= putenv(tmpnew
);
1688 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
1689 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
1690 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1691 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1693 if (consumerd64_libdir
[0] != '\0') {
1701 case LTTNG_CONSUMER32_UST
:
1703 char *tmpnew
= NULL
;
1705 if (consumerd32_libdir
[0] != '\0') {
1709 tmp
= getenv("LD_LIBRARY_PATH");
1713 tmplen
= strlen("LD_LIBRARY_PATH=")
1714 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
1715 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
1720 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
1721 strcat(tmpnew
, consumerd32_libdir
);
1722 if (tmp
[0] != '\0') {
1723 strcat(tmpnew
, ":");
1724 strcat(tmpnew
, tmp
);
1726 ret
= putenv(tmpnew
);
1732 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
1733 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
1734 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1735 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1737 if (consumerd32_libdir
[0] != '\0') {
1746 PERROR("unknown consumer type");
1750 PERROR("kernel start consumer exec");
1753 } else if (pid
> 0) {
1756 PERROR("start consumer fork");
1764 * Spawn the consumerd daemon and session daemon thread.
1766 static int start_consumerd(struct consumer_data
*consumer_data
)
1770 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1771 if (consumer_data
->pid
!= 0) {
1772 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1776 ret
= spawn_consumerd(consumer_data
);
1778 ERR("Spawning consumerd failed");
1779 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1783 /* Setting up the consumer_data pid */
1784 consumer_data
->pid
= ret
;
1785 DBG2("Consumer pid %d", consumer_data
->pid
);
1786 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1788 DBG2("Spawning consumer control thread");
1789 ret
= spawn_consumer_thread(consumer_data
);
1791 ERR("Fatal error spawning consumer control thread");
1803 * Check version of the lttng-modules.
1805 static int validate_lttng_modules_version(void)
1807 return kernel_validate_version(kernel_tracer_fd
);
1811 * Setup necessary data for kernel tracer action.
1813 static int init_kernel_tracer(void)
1817 /* Modprobe lttng kernel modules */
1818 ret
= modprobe_lttng_control();
1823 /* Open debugfs lttng */
1824 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
1825 if (kernel_tracer_fd
< 0) {
1826 DBG("Failed to open %s", module_proc_lttng
);
1831 /* Validate kernel version */
1832 ret
= validate_lttng_modules_version();
1837 ret
= modprobe_lttng_data();
1842 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1846 modprobe_remove_lttng_control();
1847 ret
= close(kernel_tracer_fd
);
1851 kernel_tracer_fd
= -1;
1852 return LTTCOMM_KERN_VERSION
;
1855 ret
= close(kernel_tracer_fd
);
1861 modprobe_remove_lttng_control();
1864 WARN("No kernel tracer available");
1865 kernel_tracer_fd
= -1;
1867 return LTTCOMM_NEED_ROOT_SESSIOND
;
1869 return LTTCOMM_KERN_NA
;
1874 * Init tracing by creating trace directory and sending fds kernel consumer.
1876 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1880 if (session
->consumer_fds_sent
== 0) {
1882 * Assign default kernel consumer socket if no consumer assigned to the
1883 * kernel session. At this point, it's NOT supposed to be -1 but this is
1884 * an extra security check.
1886 if (session
->consumer_fd
< 0) {
1887 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1890 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1892 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1896 session
->consumer_fds_sent
= 1;
1904 * Create an UST session and add it to the session ust list.
1906 static int create_ust_session(struct ltt_session
*session
,
1907 struct lttng_domain
*domain
)
1909 struct ltt_ust_session
*lus
= NULL
;
1912 switch (domain
->type
) {
1913 case LTTNG_DOMAIN_UST
:
1916 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1920 DBG("Creating UST session");
1922 lus
= trace_ust_create_session(session
->path
, session
->id
, domain
);
1924 ret
= LTTCOMM_UST_SESS_FAIL
;
1928 ret
= run_as_mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1929 session
->uid
, session
->gid
);
1931 if (ret
!= -EEXIST
) {
1932 ERR("Trace directory creation error");
1933 ret
= LTTCOMM_UST_SESS_FAIL
;
1938 /* The domain type dictate different actions on session creation */
1939 switch (domain
->type
) {
1940 case LTTNG_DOMAIN_UST
:
1941 /* No ustctl for the global UST domain */
1944 ERR("Unknown UST domain on create session %d", domain
->type
);
1947 lus
->uid
= session
->uid
;
1948 lus
->gid
= session
->gid
;
1949 session
->ust_session
= lus
;
1959 * Create a kernel tracer session then create the default channel.
1961 static int create_kernel_session(struct ltt_session
*session
)
1965 DBG("Creating kernel session");
1967 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1969 ret
= LTTCOMM_KERN_SESS_FAIL
;
1973 /* Set kernel consumer socket fd */
1974 if (kconsumer_data
.cmd_sock
>= 0) {
1975 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1978 ret
= run_as_mkdir_recursive(session
->kernel_session
->trace_path
,
1979 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
1981 if (ret
!= -EEXIST
) {
1982 ERR("Trace directory creation error");
1986 session
->kernel_session
->uid
= session
->uid
;
1987 session
->kernel_session
->gid
= session
->gid
;
1994 * Check if the UID or GID match the session. Root user has access to all
1997 static int session_access_ok(struct ltt_session
*session
, uid_t uid
, gid_t gid
)
1999 if (uid
!= session
->uid
&& gid
!= session
->gid
&& uid
!= 0) {
2006 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2009 struct ltt_session
*session
;
2011 DBG("Counting number of available session for UID %d GID %d",
2013 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2015 * Only list the sessions the user can control.
2017 if (!session_access_ok(session
, uid
, gid
)) {
2026 * Using the session list, filled a lttng_session array to send back to the
2027 * client for session listing.
2029 * The session list lock MUST be acquired before calling this function. Use
2030 * session_lock_list() and session_unlock_list().
2032 static void list_lttng_sessions(struct lttng_session
*sessions
, uid_t uid
,
2036 struct ltt_session
*session
;
2038 DBG("Getting all available session for UID %d GID %d",
2041 * Iterate over session list and append data after the control struct in
2044 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2046 * Only list the sessions the user can control.
2048 if (!session_access_ok(session
, uid
, gid
)) {
2051 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
2052 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
2053 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
2054 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
2055 sessions
[i
].enabled
= session
->enabled
;
2061 * Fill lttng_channel array of all channels.
2063 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
2064 struct lttng_channel
*channels
)
2067 struct ltt_kernel_channel
*kchan
;
2069 DBG("Listing channels for session %s", session
->name
);
2072 case LTTNG_DOMAIN_KERNEL
:
2073 /* Kernel channels */
2074 if (session
->kernel_session
!= NULL
) {
2075 cds_list_for_each_entry(kchan
,
2076 &session
->kernel_session
->channel_list
.head
, list
) {
2077 /* Copy lttng_channel struct to array */
2078 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
2079 channels
[i
].enabled
= kchan
->enabled
;
2084 case LTTNG_DOMAIN_UST
:
2086 struct lttng_ht_iter iter
;
2087 struct ltt_ust_channel
*uchan
;
2089 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
->ht
,
2090 &iter
.iter
, uchan
, node
.node
) {
2091 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
2092 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
2093 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
2094 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
2095 channels
[i
].attr
.switch_timer_interval
=
2096 uchan
->attr
.switch_timer_interval
;
2097 channels
[i
].attr
.read_timer_interval
=
2098 uchan
->attr
.read_timer_interval
;
2099 channels
[i
].enabled
= uchan
->enabled
;
2100 switch (uchan
->attr
.output
) {
2101 case LTTNG_UST_MMAP
:
2103 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
2116 * Create a list of ust global domain events.
2118 static int list_lttng_ust_global_events(char *channel_name
,
2119 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
2122 unsigned int nb_event
= 0;
2123 struct lttng_ht_iter iter
;
2124 struct lttng_ht_node_str
*node
;
2125 struct ltt_ust_channel
*uchan
;
2126 struct ltt_ust_event
*uevent
;
2127 struct lttng_event
*tmp
;
2129 DBG("Listing UST global events for channel %s", channel_name
);
2133 lttng_ht_lookup(ust_global
->channels
, (void *)channel_name
, &iter
);
2134 node
= lttng_ht_iter_get_node_str(&iter
);
2136 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
2140 uchan
= caa_container_of(&node
->node
, struct ltt_ust_channel
, node
.node
);
2142 nb_event
+= lttng_ht_get_count(uchan
->events
);
2144 if (nb_event
== 0) {
2149 DBG3("Listing UST global %d events", nb_event
);
2151 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2153 ret
= -LTTCOMM_FATAL
;
2157 cds_lfht_for_each_entry(uchan
->events
->ht
, &iter
.iter
, uevent
, node
.node
) {
2158 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
2159 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2160 tmp
[i
].enabled
= uevent
->enabled
;
2161 switch (uevent
->attr
.instrumentation
) {
2162 case LTTNG_UST_TRACEPOINT
:
2163 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2165 case LTTNG_UST_PROBE
:
2166 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2168 case LTTNG_UST_FUNCTION
:
2169 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2172 tmp
[i
].loglevel
= uevent
->attr
.loglevel
;
2173 switch (uevent
->attr
.loglevel_type
) {
2174 case LTTNG_UST_LOGLEVEL_ALL
:
2175 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_ALL
;
2177 case LTTNG_UST_LOGLEVEL_RANGE
:
2178 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_RANGE
;
2180 case LTTNG_UST_LOGLEVEL_SINGLE
:
2181 tmp
[i
].loglevel_type
= LTTNG_EVENT_LOGLEVEL_SINGLE
;
2196 * Fill lttng_event array of all kernel events in the channel.
2198 static int list_lttng_kernel_events(char *channel_name
,
2199 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2202 unsigned int nb_event
;
2203 struct ltt_kernel_event
*event
;
2204 struct ltt_kernel_channel
*kchan
;
2206 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2207 if (kchan
== NULL
) {
2208 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2212 nb_event
= kchan
->event_count
;
2214 DBG("Listing events for channel %s", kchan
->channel
->name
);
2216 if (nb_event
== 0) {
2221 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2222 if (*events
== NULL
) {
2223 ret
= LTTCOMM_FATAL
;
2227 /* Kernel channels */
2228 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2229 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2230 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2231 (*events
)[i
].enabled
= event
->enabled
;
2232 switch (event
->event
->instrumentation
) {
2233 case LTTNG_KERNEL_TRACEPOINT
:
2234 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2236 case LTTNG_KERNEL_KPROBE
:
2237 case LTTNG_KERNEL_KRETPROBE
:
2238 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2239 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2240 sizeof(struct lttng_kernel_kprobe
));
2242 case LTTNG_KERNEL_FUNCTION
:
2243 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2244 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2245 sizeof(struct lttng_kernel_function
));
2247 case LTTNG_KERNEL_NOOP
:
2248 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2250 case LTTNG_KERNEL_SYSCALL
:
2251 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2253 case LTTNG_KERNEL_ALL
:
2267 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2269 static int cmd_disable_channel(struct ltt_session
*session
,
2270 int domain
, char *channel_name
)
2273 struct ltt_ust_session
*usess
;
2275 usess
= session
->ust_session
;
2278 case LTTNG_DOMAIN_KERNEL
:
2280 ret
= channel_kernel_disable(session
->kernel_session
,
2282 if (ret
!= LTTCOMM_OK
) {
2286 kernel_wait_quiescent(kernel_tracer_fd
);
2289 case LTTNG_DOMAIN_UST
:
2291 struct ltt_ust_channel
*uchan
;
2292 struct lttng_ht
*chan_ht
;
2294 chan_ht
= usess
->domain_global
.channels
;
2296 uchan
= trace_ust_find_channel_by_name(chan_ht
, channel_name
);
2297 if (uchan
== NULL
) {
2298 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2302 ret
= channel_ust_disable(usess
, domain
, uchan
);
2303 if (ret
!= LTTCOMM_OK
) {
2309 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2310 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2311 case LTTNG_DOMAIN_UST_PID
:
2314 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2325 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2327 static int cmd_enable_channel(struct ltt_session
*session
,
2328 int domain
, struct lttng_channel
*attr
)
2331 struct ltt_ust_session
*usess
= session
->ust_session
;
2332 struct lttng_ht
*chan_ht
;
2334 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2337 case LTTNG_DOMAIN_KERNEL
:
2339 struct ltt_kernel_channel
*kchan
;
2341 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2342 session
->kernel_session
);
2343 if (kchan
== NULL
) {
2344 ret
= channel_kernel_create(session
->kernel_session
,
2345 attr
, kernel_poll_pipe
[1]);
2347 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2350 if (ret
!= LTTCOMM_OK
) {
2354 kernel_wait_quiescent(kernel_tracer_fd
);
2357 case LTTNG_DOMAIN_UST
:
2359 struct ltt_ust_channel
*uchan
;
2361 chan_ht
= usess
->domain_global
.channels
;
2363 uchan
= trace_ust_find_channel_by_name(chan_ht
, attr
->name
);
2364 if (uchan
== NULL
) {
2365 ret
= channel_ust_create(usess
, domain
, attr
);
2367 ret
= channel_ust_enable(usess
, domain
, uchan
);
2372 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2373 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2374 case LTTNG_DOMAIN_UST_PID
:
2377 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2386 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2388 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2389 char *channel_name
, char *event_name
)
2394 case LTTNG_DOMAIN_KERNEL
:
2396 struct ltt_kernel_channel
*kchan
;
2397 struct ltt_kernel_session
*ksess
;
2399 ksess
= session
->kernel_session
;
2401 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2402 if (kchan
== NULL
) {
2403 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2407 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2408 if (ret
!= LTTCOMM_OK
) {
2412 kernel_wait_quiescent(kernel_tracer_fd
);
2415 case LTTNG_DOMAIN_UST
:
2417 struct ltt_ust_channel
*uchan
;
2418 struct ltt_ust_session
*usess
;
2420 usess
= session
->ust_session
;
2422 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2424 if (uchan
== NULL
) {
2425 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2429 ret
= event_ust_disable_tracepoint(usess
, domain
, uchan
, event_name
);
2430 if (ret
!= LTTCOMM_OK
) {
2434 DBG3("Disable UST event %s in channel %s completed", event_name
,
2439 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2440 case LTTNG_DOMAIN_UST_PID
:
2441 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2455 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2457 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2463 case LTTNG_DOMAIN_KERNEL
:
2465 struct ltt_kernel_session
*ksess
;
2466 struct ltt_kernel_channel
*kchan
;
2468 ksess
= session
->kernel_session
;
2470 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2471 if (kchan
== NULL
) {
2472 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2476 ret
= event_kernel_disable_all(ksess
, kchan
);
2477 if (ret
!= LTTCOMM_OK
) {
2481 kernel_wait_quiescent(kernel_tracer_fd
);
2484 case LTTNG_DOMAIN_UST
:
2486 struct ltt_ust_session
*usess
;
2487 struct ltt_ust_channel
*uchan
;
2489 usess
= session
->ust_session
;
2491 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2493 if (uchan
== NULL
) {
2494 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2498 ret
= event_ust_disable_all_tracepoints(usess
, domain
, uchan
);
2503 DBG3("Disable all UST events in channel %s completed", channel_name
);
2508 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2509 case LTTNG_DOMAIN_UST_PID
:
2510 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2524 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2526 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2527 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2532 case LTTNG_DOMAIN_KERNEL
:
2533 /* Add kernel context to kernel tracer */
2534 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2535 event_name
, channel_name
);
2536 if (ret
!= LTTCOMM_OK
) {
2540 case LTTNG_DOMAIN_UST
:
2542 struct ltt_ust_session
*usess
= session
->ust_session
;
2544 ret
= context_ust_add(usess
, domain
, ctx
, event_name
, channel_name
);
2545 if (ret
!= LTTCOMM_OK
) {
2551 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2552 case LTTNG_DOMAIN_UST_PID
:
2553 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2567 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2569 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2570 char *channel_name
, struct lttng_event
*event
)
2573 struct lttng_channel
*attr
;
2574 struct ltt_ust_session
*usess
= session
->ust_session
;
2577 case LTTNG_DOMAIN_KERNEL
:
2579 struct ltt_kernel_channel
*kchan
;
2581 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2582 session
->kernel_session
);
2583 if (kchan
== NULL
) {
2584 attr
= channel_new_default_attr(domain
);
2586 ret
= LTTCOMM_FATAL
;
2589 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2591 /* This call will notify the kernel thread */
2592 ret
= channel_kernel_create(session
->kernel_session
,
2593 attr
, kernel_poll_pipe
[1]);
2594 if (ret
!= LTTCOMM_OK
) {
2601 /* Get the newly created kernel channel pointer */
2602 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2603 session
->kernel_session
);
2604 if (kchan
== NULL
) {
2605 /* This sould not happen... */
2606 ret
= LTTCOMM_FATAL
;
2610 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2612 if (ret
!= LTTCOMM_OK
) {
2616 kernel_wait_quiescent(kernel_tracer_fd
);
2619 case LTTNG_DOMAIN_UST
:
2621 struct lttng_channel
*attr
;
2622 struct ltt_ust_channel
*uchan
;
2624 /* Get channel from global UST domain */
2625 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2627 if (uchan
== NULL
) {
2628 /* Create default channel */
2629 attr
= channel_new_default_attr(domain
);
2631 ret
= LTTCOMM_FATAL
;
2634 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2635 attr
->name
[NAME_MAX
- 1] = '\0';
2637 ret
= channel_ust_create(usess
, domain
, attr
);
2638 if (ret
!= LTTCOMM_OK
) {
2644 /* Get the newly created channel reference back */
2645 uchan
= trace_ust_find_channel_by_name(
2646 usess
->domain_global
.channels
, channel_name
);
2647 if (uchan
== NULL
) {
2648 /* Something is really wrong */
2649 ret
= LTTCOMM_FATAL
;
2654 /* At this point, the session and channel exist on the tracer */
2655 ret
= event_ust_enable_tracepoint(usess
, domain
, uchan
, event
);
2656 if (ret
!= LTTCOMM_OK
) {
2662 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2663 case LTTNG_DOMAIN_UST_PID
:
2664 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2678 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2680 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2681 char *channel_name
, int event_type
)
2684 struct ltt_kernel_channel
*kchan
;
2687 case LTTNG_DOMAIN_KERNEL
:
2688 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2689 session
->kernel_session
);
2690 if (kchan
== NULL
) {
2691 /* This call will notify the kernel thread */
2692 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2693 kernel_poll_pipe
[1]);
2694 if (ret
!= LTTCOMM_OK
) {
2698 /* Get the newly created kernel channel pointer */
2699 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2700 session
->kernel_session
);
2701 if (kchan
== NULL
) {
2702 /* This sould not happen... */
2703 ret
= LTTCOMM_FATAL
;
2709 switch (event_type
) {
2710 case LTTNG_EVENT_SYSCALL
:
2711 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2712 kchan
, kernel_tracer_fd
);
2714 case LTTNG_EVENT_TRACEPOINT
:
2716 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2717 * events already registered to the channel.
2719 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2720 kchan
, kernel_tracer_fd
);
2722 case LTTNG_EVENT_ALL
:
2723 /* Enable syscalls and tracepoints */
2724 ret
= event_kernel_enable_all(session
->kernel_session
,
2725 kchan
, kernel_tracer_fd
);
2728 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2732 /* Manage return value */
2733 if (ret
!= LTTCOMM_OK
) {
2737 kernel_wait_quiescent(kernel_tracer_fd
);
2739 case LTTNG_DOMAIN_UST
:
2741 struct lttng_channel
*attr
;
2742 struct ltt_ust_channel
*uchan
;
2743 struct ltt_ust_session
*usess
= session
->ust_session
;
2745 /* Get channel from global UST domain */
2746 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2748 if (uchan
== NULL
) {
2749 /* Create default channel */
2750 attr
= channel_new_default_attr(domain
);
2752 ret
= LTTCOMM_FATAL
;
2755 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2756 attr
->name
[NAME_MAX
- 1] = '\0';
2758 /* Use the internal command enable channel */
2759 ret
= channel_ust_create(usess
, domain
, attr
);
2760 if (ret
!= LTTCOMM_OK
) {
2766 /* Get the newly created channel reference back */
2767 uchan
= trace_ust_find_channel_by_name(
2768 usess
->domain_global
.channels
, channel_name
);
2769 if (uchan
== NULL
) {
2770 /* Something is really wrong */
2771 ret
= LTTCOMM_FATAL
;
2776 /* At this point, the session and channel exist on the tracer */
2778 switch (event_type
) {
2779 case LTTNG_EVENT_ALL
:
2780 case LTTNG_EVENT_TRACEPOINT
:
2781 ret
= event_ust_enable_all_tracepoints(usess
, domain
, uchan
);
2782 if (ret
!= LTTCOMM_OK
) {
2787 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2791 /* Manage return value */
2792 if (ret
!= LTTCOMM_OK
) {
2799 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2800 case LTTNG_DOMAIN_UST_PID
:
2801 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2815 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2817 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2820 ssize_t nb_events
= 0;
2823 case LTTNG_DOMAIN_KERNEL
:
2824 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2825 if (nb_events
< 0) {
2826 ret
= LTTCOMM_KERN_LIST_FAIL
;
2830 case LTTNG_DOMAIN_UST
:
2831 nb_events
= ust_app_list_events(events
);
2832 if (nb_events
< 0) {
2833 ret
= LTTCOMM_UST_LIST_FAIL
;
2845 /* Return negative value to differentiate return code */
2850 * Command LTTNG_START_TRACE processed by the client thread.
2852 static int cmd_start_trace(struct ltt_session
*session
)
2855 struct ltt_kernel_session
*ksession
;
2856 struct ltt_ust_session
*usess
;
2859 ksession
= session
->kernel_session
;
2860 usess
= session
->ust_session
;
2862 if (session
->enabled
) {
2863 /* Already started. */
2864 ret
= LTTCOMM_TRACE_ALREADY_STARTED
;
2868 session
->enabled
= 1;
2870 /* Kernel tracing */
2871 if (ksession
!= NULL
) {
2872 struct ltt_kernel_channel
*kchan
;
2874 /* Open kernel metadata */
2875 if (ksession
->metadata
== NULL
) {
2876 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2878 ret
= LTTCOMM_KERN_META_FAIL
;
2883 /* Open kernel metadata stream */
2884 if (ksession
->metadata_stream_fd
< 0) {
2885 ret
= kernel_open_metadata_stream(ksession
);
2887 ERR("Kernel create metadata stream failed");
2888 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2893 /* For each channel */
2894 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2895 if (kchan
->stream_count
== 0) {
2896 ret
= kernel_open_channel_stream(kchan
);
2898 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2901 /* Update the stream global counter */
2902 ksession
->stream_count_global
+= ret
;
2906 /* Setup kernel consumer socket and send fds to it */
2907 ret
= init_kernel_tracing(ksession
);
2909 ret
= LTTCOMM_KERN_START_FAIL
;
2913 /* This start the kernel tracing */
2914 ret
= kernel_start_session(ksession
);
2916 ret
= LTTCOMM_KERN_START_FAIL
;
2920 /* Quiescent wait after starting trace */
2921 kernel_wait_quiescent(kernel_tracer_fd
);
2924 /* Flag session that trace should start automatically */
2926 usess
->start_trace
= 1;
2928 ret
= ust_app_start_trace_all(usess
);
2930 ret
= LTTCOMM_UST_START_FAIL
;
2942 * Command LTTNG_STOP_TRACE processed by the client thread.
2944 static int cmd_stop_trace(struct ltt_session
*session
)
2947 struct ltt_kernel_channel
*kchan
;
2948 struct ltt_kernel_session
*ksession
;
2949 struct ltt_ust_session
*usess
;
2952 ksession
= session
->kernel_session
;
2953 usess
= session
->ust_session
;
2955 if (!session
->enabled
) {
2956 ret
= LTTCOMM_TRACE_ALREADY_STOPPED
;
2960 session
->enabled
= 0;
2963 if (ksession
!= NULL
) {
2964 DBG("Stop kernel tracing");
2966 /* Flush all buffers before stopping */
2967 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2969 ERR("Kernel metadata flush failed");
2972 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2973 ret
= kernel_flush_buffer(kchan
);
2975 ERR("Kernel flush buffer error");
2979 ret
= kernel_stop_session(ksession
);
2981 ret
= LTTCOMM_KERN_STOP_FAIL
;
2985 kernel_wait_quiescent(kernel_tracer_fd
);
2989 usess
->start_trace
= 0;
2991 ret
= ust_app_stop_trace_all(usess
);
2993 ret
= LTTCOMM_UST_STOP_FAIL
;
3005 * Command LTTNG_CREATE_SESSION processed by the client thread.
3007 static int cmd_create_session(char *name
, char *path
, lttng_sock_cred
*creds
)
3011 ret
= session_create(name
, path
, LTTNG_SOCK_GET_UID_CRED(creds
),
3012 LTTNG_SOCK_GET_GID_CRED(creds
));
3013 if (ret
!= LTTCOMM_OK
) {
3024 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3026 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
3030 /* Clean kernel session teardown */
3031 teardown_kernel_session(session
);
3032 /* UST session teardown */
3033 teardown_ust_session(session
);
3036 * Must notify the kernel thread here to update it's poll setin order
3037 * to remove the channel(s)' fd just destroyed.
3039 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
3041 PERROR("write kernel poll pipe");
3044 ret
= session_destroy(session
);
3050 * Command LTTNG_CALIBRATE processed by the client thread.
3052 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
3057 case LTTNG_DOMAIN_KERNEL
:
3059 struct lttng_kernel_calibrate kcalibrate
;
3061 kcalibrate
.type
= calibrate
->type
;
3062 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
3064 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
3069 case LTTNG_DOMAIN_UST
:
3071 struct lttng_ust_calibrate ucalibrate
;
3073 ucalibrate
.type
= calibrate
->type
;
3074 ret
= ust_app_calibrate_glb(&ucalibrate
);
3076 ret
= LTTCOMM_UST_CALIBRATE_FAIL
;
3093 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3095 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
3101 case LTTNG_DOMAIN_KERNEL
:
3102 /* Can't register a consumer if there is already one */
3103 if (session
->kernel_session
->consumer_fds_sent
!= 0) {
3104 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3108 sock
= lttcomm_connect_unix_sock(sock_path
);
3110 ret
= LTTCOMM_CONNECT_FAIL
;
3114 session
->kernel_session
->consumer_fd
= sock
;
3117 /* TODO: Userspace tracing */
3129 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3131 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
3132 struct lttng_domain
**domains
)
3137 if (session
->kernel_session
!= NULL
) {
3138 DBG3("Listing domains found kernel domain");
3142 if (session
->ust_session
!= NULL
) {
3143 DBG3("Listing domains found UST global domain");
3147 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
3148 if (*domains
== NULL
) {
3149 ret
= -LTTCOMM_FATAL
;
3153 if (session
->kernel_session
!= NULL
) {
3154 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
3158 if (session
->ust_session
!= NULL
) {
3159 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
3170 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3172 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
3173 struct lttng_channel
**channels
)
3176 ssize_t nb_chan
= 0;
3179 case LTTNG_DOMAIN_KERNEL
:
3180 if (session
->kernel_session
!= NULL
) {
3181 nb_chan
= session
->kernel_session
->channel_count
;
3183 DBG3("Number of kernel channels %zd", nb_chan
);
3185 case LTTNG_DOMAIN_UST
:
3186 if (session
->ust_session
!= NULL
) {
3187 nb_chan
= lttng_ht_get_count(
3188 session
->ust_session
->domain_global
.channels
);
3190 DBG3("Number of UST global channels %zd", nb_chan
);
3199 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3200 if (*channels
== NULL
) {
3201 ret
= -LTTCOMM_FATAL
;
3205 list_lttng_channels(domain
, session
, *channels
);
3217 * Command LTTNG_LIST_EVENTS processed by the client thread.
3219 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3220 char *channel_name
, struct lttng_event
**events
)
3223 ssize_t nb_event
= 0;
3226 case LTTNG_DOMAIN_KERNEL
:
3227 if (session
->kernel_session
!= NULL
) {
3228 nb_event
= list_lttng_kernel_events(channel_name
,
3229 session
->kernel_session
, events
);
3232 case LTTNG_DOMAIN_UST
:
3234 if (session
->ust_session
!= NULL
) {
3235 nb_event
= list_lttng_ust_global_events(channel_name
,
3236 &session
->ust_session
->domain_global
, events
);
3252 * Process the command requested by the lttng client within the command
3253 * context structure. This function make sure that the return structure (llm)
3254 * is set and ready for transmission before returning.
3256 * Return any error encountered or 0 for success.
3258 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3260 int ret
= LTTCOMM_OK
;
3261 int need_tracing_session
= 1;
3264 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3266 switch (cmd_ctx
->lsm
->cmd_type
) {
3267 case LTTNG_CREATE_SESSION
:
3268 case LTTNG_DESTROY_SESSION
:
3269 case LTTNG_LIST_SESSIONS
:
3270 case LTTNG_LIST_DOMAINS
:
3271 case LTTNG_START_TRACE
:
3272 case LTTNG_STOP_TRACE
:
3279 if (opt_no_kernel
&& need_domain
3280 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
3282 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3284 ret
= LTTCOMM_KERN_NA
;
3290 * Check for command that don't needs to allocate a returned payload. We do
3291 * this here so we don't have to make the call for no payload at each
3294 switch(cmd_ctx
->lsm
->cmd_type
) {
3295 case LTTNG_LIST_SESSIONS
:
3296 case LTTNG_LIST_TRACEPOINTS
:
3297 case LTTNG_LIST_DOMAINS
:
3298 case LTTNG_LIST_CHANNELS
:
3299 case LTTNG_LIST_EVENTS
:
3302 /* Setup lttng message with no payload */
3303 ret
= setup_lttng_msg(cmd_ctx
, 0);
3305 /* This label does not try to unlock the session */
3306 goto init_setup_error
;
3310 /* Commands that DO NOT need a session. */
3311 switch (cmd_ctx
->lsm
->cmd_type
) {
3312 case LTTNG_CREATE_SESSION
:
3313 case LTTNG_CALIBRATE
:
3314 case LTTNG_LIST_SESSIONS
:
3315 case LTTNG_LIST_TRACEPOINTS
:
3316 need_tracing_session
= 0;
3319 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3321 * We keep the session list lock across _all_ commands
3322 * for now, because the per-session lock does not
3323 * handle teardown properly.
3325 session_lock_list();
3326 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3327 if (cmd_ctx
->session
== NULL
) {
3328 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3329 ret
= LTTCOMM_SESS_NOT_FOUND
;
3331 /* If no session name specified */
3332 ret
= LTTCOMM_SELECT_SESS
;
3336 /* Acquire lock for the session */
3337 session_lock(cmd_ctx
->session
);
3346 * Check domain type for specific "pre-action".
3348 switch (cmd_ctx
->lsm
->domain
.type
) {
3349 case LTTNG_DOMAIN_KERNEL
:
3351 ret
= LTTCOMM_NEED_ROOT_SESSIOND
;
3355 /* Kernel tracer check */
3356 if (kernel_tracer_fd
== -1) {
3357 /* Basically, load kernel tracer modules */
3358 ret
= init_kernel_tracer();
3364 /* Need a session for kernel command */
3365 if (need_tracing_session
) {
3366 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3367 ret
= create_kernel_session(cmd_ctx
->session
);
3369 ret
= LTTCOMM_KERN_SESS_FAIL
;
3374 /* Start the kernel consumer daemon */
3375 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3376 if (kconsumer_data
.pid
== 0 &&
3377 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3378 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3379 ret
= start_consumerd(&kconsumer_data
);
3381 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3385 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3389 case LTTNG_DOMAIN_UST
:
3391 if (need_tracing_session
) {
3392 if (cmd_ctx
->session
->ust_session
== NULL
) {
3393 ret
= create_ust_session(cmd_ctx
->session
,
3394 &cmd_ctx
->lsm
->domain
);
3395 if (ret
!= LTTCOMM_OK
) {
3399 /* Start the UST consumer daemons */
3401 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3402 if (consumerd64_bin
[0] != '\0' &&
3403 ustconsumer64_data
.pid
== 0 &&
3404 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3405 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3406 ret
= start_consumerd(&ustconsumer64_data
);
3408 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3409 ust_consumerd64_fd
= -EINVAL
;
3413 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3415 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3418 if (consumerd32_bin
[0] != '\0' &&
3419 ustconsumer32_data
.pid
== 0 &&
3420 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3421 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3422 ret
= start_consumerd(&ustconsumer32_data
);
3424 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3425 ust_consumerd32_fd
= -EINVAL
;
3428 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3430 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3441 * Check that the UID or GID match that of the tracing session.
3442 * The root user can interact with all sessions.
3444 if (need_tracing_session
) {
3445 if (!session_access_ok(cmd_ctx
->session
,
3446 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3447 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3448 ret
= LTTCOMM_EPERM
;
3453 /* Process by command type */
3454 switch (cmd_ctx
->lsm
->cmd_type
) {
3455 case LTTNG_ADD_CONTEXT
:
3457 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3458 cmd_ctx
->lsm
->u
.context
.channel_name
,
3459 cmd_ctx
->lsm
->u
.context
.event_name
,
3460 &cmd_ctx
->lsm
->u
.context
.ctx
);
3463 case LTTNG_DISABLE_CHANNEL
:
3465 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3466 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3469 case LTTNG_DISABLE_EVENT
:
3471 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3472 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3473 cmd_ctx
->lsm
->u
.disable
.name
);
3476 case LTTNG_DISABLE_ALL_EVENT
:
3478 DBG("Disabling all events");
3480 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3481 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3484 case LTTNG_ENABLE_CHANNEL
:
3486 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3487 &cmd_ctx
->lsm
->u
.channel
.chan
);
3490 case LTTNG_ENABLE_EVENT
:
3492 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3493 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3494 &cmd_ctx
->lsm
->u
.enable
.event
);
3497 case LTTNG_ENABLE_ALL_EVENT
:
3499 DBG("Enabling all events");
3501 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3502 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3503 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3506 case LTTNG_LIST_TRACEPOINTS
:
3508 struct lttng_event
*events
;
3511 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3512 if (nb_events
< 0) {
3518 * Setup lttng message with payload size set to the event list size in
3519 * bytes and then copy list into the llm payload.
3521 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3527 /* Copy event list into message payload */
3528 memcpy(cmd_ctx
->llm
->payload
, events
,
3529 sizeof(struct lttng_event
) * nb_events
);
3536 case LTTNG_START_TRACE
:
3538 ret
= cmd_start_trace(cmd_ctx
->session
);
3541 case LTTNG_STOP_TRACE
:
3543 ret
= cmd_stop_trace(cmd_ctx
->session
);
3546 case LTTNG_CREATE_SESSION
:
3548 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3549 cmd_ctx
->lsm
->session
.path
, &cmd_ctx
->creds
);
3552 case LTTNG_DESTROY_SESSION
:
3554 ret
= cmd_destroy_session(cmd_ctx
->session
,
3555 cmd_ctx
->lsm
->session
.name
);
3557 * Set session to NULL so we do not unlock it after
3560 cmd_ctx
->session
= NULL
;
3563 case LTTNG_LIST_DOMAINS
:
3566 struct lttng_domain
*domains
;
3568 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3574 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3579 /* Copy event list into message payload */
3580 memcpy(cmd_ctx
->llm
->payload
, domains
,
3581 nb_dom
* sizeof(struct lttng_domain
));
3588 case LTTNG_LIST_CHANNELS
:
3591 struct lttng_channel
*channels
;
3593 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3594 cmd_ctx
->session
, &channels
);
3600 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3605 /* Copy event list into message payload */
3606 memcpy(cmd_ctx
->llm
->payload
, channels
,
3607 nb_chan
* sizeof(struct lttng_channel
));
3614 case LTTNG_LIST_EVENTS
:
3617 struct lttng_event
*events
= NULL
;
3619 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3620 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3626 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3631 /* Copy event list into message payload */
3632 memcpy(cmd_ctx
->llm
->payload
, events
,
3633 nb_event
* sizeof(struct lttng_event
));
3640 case LTTNG_LIST_SESSIONS
:
3642 unsigned int nr_sessions
;
3644 session_lock_list();
3645 nr_sessions
= lttng_sessions_count(
3646 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3647 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3649 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3651 session_unlock_list();
3655 /* Filled the session array */
3656 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3657 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3658 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3660 session_unlock_list();
3665 case LTTNG_CALIBRATE
:
3667 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3668 &cmd_ctx
->lsm
->u
.calibrate
);
3671 case LTTNG_REGISTER_CONSUMER
:
3673 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3674 cmd_ctx
->lsm
->u
.reg
.path
);
3683 if (cmd_ctx
->llm
== NULL
) {
3684 DBG("Missing llm structure. Allocating one.");
3685 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3689 /* Set return code */
3690 cmd_ctx
->llm
->ret_code
= ret
;
3692 if (cmd_ctx
->session
) {
3693 session_unlock(cmd_ctx
->session
);
3695 if (need_tracing_session
) {
3696 session_unlock_list();
3703 * This thread manage all clients request using the unix client socket for
3706 static void *thread_manage_clients(void *data
)
3708 int sock
= -1, ret
, i
, pollfd
;
3709 uint32_t revents
, nb_fd
;
3710 struct command_ctx
*cmd_ctx
= NULL
;
3711 struct lttng_poll_event events
;
3713 DBG("[thread] Manage client started");
3715 rcu_register_thread();
3717 ret
= lttcomm_listen_unix_sock(client_sock
);
3723 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3724 * more will be added to this poll set.
3726 ret
= create_thread_poll_set(&events
, 2);
3731 /* Add the application registration socket */
3732 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3738 * Notify parent pid that we are ready to accept command for client side.
3740 if (opt_sig_parent
) {
3741 kill(ppid
, SIGUSR1
);
3745 DBG("Accepting client command ...");
3747 nb_fd
= LTTNG_POLL_GETNB(&events
);
3749 /* Inifinite blocking call, waiting for transmission */
3751 ret
= lttng_poll_wait(&events
, -1);
3754 * Restart interrupted system call.
3756 if (errno
== EINTR
) {
3762 for (i
= 0; i
< nb_fd
; i
++) {
3763 /* Fetch once the poll data */
3764 revents
= LTTNG_POLL_GETEV(&events
, i
);
3765 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3767 /* Thread quit pipe has been closed. Killing thread. */
3768 ret
= check_thread_quit_pipe(pollfd
, revents
);
3773 /* Event on the registration socket */
3774 if (pollfd
== client_sock
) {
3775 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3776 ERR("Client socket poll error");
3782 DBG("Wait for client response");
3784 sock
= lttcomm_accept_unix_sock(client_sock
);
3789 /* Set socket option for credentials retrieval */
3790 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
3795 /* Allocate context command to process the client request */
3796 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3797 if (cmd_ctx
== NULL
) {
3798 PERROR("zmalloc cmd_ctx");
3802 /* Allocate data buffer for reception */
3803 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3804 if (cmd_ctx
->lsm
== NULL
) {
3805 PERROR("zmalloc cmd_ctx->lsm");
3809 cmd_ctx
->llm
= NULL
;
3810 cmd_ctx
->session
= NULL
;
3813 * Data is received from the lttng client. The struct
3814 * lttcomm_session_msg (lsm) contains the command and data request of
3817 DBG("Receiving data from client ...");
3818 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
3819 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
3821 DBG("Nothing recv() from client... continuing");
3827 clean_command_ctx(&cmd_ctx
);
3831 // TODO: Validate cmd_ctx including sanity check for
3832 // security purpose.
3834 rcu_thread_online();
3836 * This function dispatch the work to the kernel or userspace tracer
3837 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3838 * informations for the client. The command context struct contains
3839 * everything this function may needs.
3841 ret
= process_client_msg(cmd_ctx
);
3842 rcu_thread_offline();
3845 * TODO: Inform client somehow of the fatal error. At
3846 * this point, ret < 0 means that a zmalloc failed
3847 * (ENOMEM). Error detected but still accept command.
3849 clean_command_ctx(&cmd_ctx
);
3853 DBG("Sending response (size: %d, retcode: %s)",
3854 cmd_ctx
->lttng_msg_size
,
3855 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3856 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3858 ERR("Failed to send data back to client");
3861 /* End of transmission */
3868 clean_command_ctx(&cmd_ctx
);
3872 DBG("Client thread dying");
3873 unlink(client_unix_sock_path
);
3874 if (client_sock
>= 0) {
3875 ret
= close(client_sock
);
3887 lttng_poll_clean(&events
);
3888 clean_command_ctx(&cmd_ctx
);
3890 rcu_unregister_thread();
3896 * usage function on stderr
3898 static void usage(void)
3900 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3901 fprintf(stderr
, " -h, --help Display this usage.\n");
3902 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3903 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3904 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3905 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3906 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3907 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3908 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3909 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3910 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3911 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3912 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3913 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3914 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3915 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3916 fprintf(stderr
, " -V, --version Show version number.\n");
3917 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3918 fprintf(stderr
, " -q, --quiet No output at all.\n");
3919 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3920 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3921 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
3925 * daemon argument parsing
3927 static int parse_args(int argc
, char **argv
)
3931 static struct option long_options
[] = {
3932 { "client-sock", 1, 0, 'c' },
3933 { "apps-sock", 1, 0, 'a' },
3934 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3935 { "kconsumerd-err-sock", 1, 0, 'E' },
3936 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3937 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3938 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3939 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3940 { "consumerd32-path", 1, 0, 'u' },
3941 { "consumerd32-libdir", 1, 0, 'U' },
3942 { "consumerd64-path", 1, 0, 't' },
3943 { "consumerd64-libdir", 1, 0, 'T' },
3944 { "daemonize", 0, 0, 'd' },
3945 { "sig-parent", 0, 0, 'S' },
3946 { "help", 0, 0, 'h' },
3947 { "group", 1, 0, 'g' },
3948 { "version", 0, 0, 'V' },
3949 { "quiet", 0, 0, 'q' },
3950 { "verbose", 0, 0, 'v' },
3951 { "verbose-consumer", 0, 0, 'Z' },
3952 { "no-kernel", 0, 0, 'N' },
3957 int option_index
= 0;
3958 c
= getopt_long(argc
, argv
, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3959 long_options
, &option_index
);
3966 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3968 fprintf(stderr
, " with arg %s\n", optarg
);
3972 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3975 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3981 opt_tracing_group
= optarg
;
3987 fprintf(stdout
, "%s\n", VERSION
);
3993 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3996 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3999 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4002 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4005 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4008 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
4014 lttng_opt_quiet
= 1;
4017 /* Verbose level can increase using multiple -v */
4018 lttng_opt_verbose
+= 1;
4021 opt_verbose_consumer
+= 1;
4024 consumerd32_bin
= optarg
;
4027 consumerd32_libdir
= optarg
;
4030 consumerd64_bin
= optarg
;
4033 consumerd64_libdir
= optarg
;
4036 /* Unknown option or other error.
4037 * Error is printed by getopt, just return */
4046 * Creates the two needed socket by the daemon.
4047 * apps_sock - The communication socket for all UST apps.
4048 * client_sock - The communication of the cli tool (lttng).
4050 static int init_daemon_socket(void)
4055 old_umask
= umask(0);
4057 /* Create client tool unix socket */
4058 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4059 if (client_sock
< 0) {
4060 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4065 /* File permission MUST be 660 */
4066 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4068 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4073 /* Create the application unix socket */
4074 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4075 if (apps_sock
< 0) {
4076 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4081 /* File permission MUST be 666 */
4082 ret
= chmod(apps_unix_sock_path
,
4083 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4085 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4096 * Check if the global socket is available, and if a daemon is answering at the
4097 * other side. If yes, error is returned.
4099 static int check_existing_daemon(void)
4101 /* Is there anybody out there ? */
4102 if (lttng_session_daemon_alive()) {
4110 * Set the tracing group gid onto the client socket.
4112 * Race window between mkdir and chown is OK because we are going from more
4113 * permissive (root.root) to less permissive (root.tracing).
4115 static int set_permissions(char *rundir
)
4120 gid
= allowed_group();
4122 WARN("No tracing group detected");
4127 /* Set lttng run dir */
4128 ret
= chown(rundir
, 0, gid
);
4130 ERR("Unable to set group on %s", rundir
);
4134 /* Ensure tracing group can search the run dir */
4135 ret
= chmod(rundir
, S_IRWXU
| S_IXGRP
| S_IXOTH
);
4137 ERR("Unable to set permissions on %s", rundir
);
4141 /* lttng client socket path */
4142 ret
= chown(client_unix_sock_path
, 0, gid
);
4144 ERR("Unable to set group on %s", client_unix_sock_path
);
4148 /* kconsumer error socket path */
4149 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
4151 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4155 /* 64-bit ustconsumer error socket path */
4156 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
4158 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4162 /* 32-bit ustconsumer compat32 error socket path */
4163 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
4165 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4169 DBG("All permissions are set");
4176 * Create the pipe used to wake up the kernel thread.
4177 * Closed in cleanup().
4179 static int create_kernel_poll_pipe(void)
4183 ret
= pipe(kernel_poll_pipe
);
4185 PERROR("kernel poll pipe");
4189 for (i
= 0; i
< 2; i
++) {
4190 ret
= fcntl(kernel_poll_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4192 PERROR("fcntl kernel_poll_pipe");
4202 * Create the application command pipe to wake thread_manage_apps.
4203 * Closed in cleanup().
4205 static int create_apps_cmd_pipe(void)
4209 ret
= pipe(apps_cmd_pipe
);
4211 PERROR("apps cmd pipe");
4215 for (i
= 0; i
< 2; i
++) {
4216 ret
= fcntl(apps_cmd_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
4218 PERROR("fcntl apps_cmd_pipe");
4228 * Create the lttng run directory needed for all global sockets and pipe.
4230 static int create_lttng_rundir(const char *rundir
)
4234 DBG3("Creating LTTng run directory: %s", rundir
);
4236 ret
= mkdir(rundir
, S_IRWXU
);
4238 if (errno
!= EEXIST
) {
4239 ERR("Unable to create %s", rundir
);
4251 * Setup sockets and directory needed by the kconsumerd communication with the
4254 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4258 char path
[PATH_MAX
];
4260 switch (consumer_data
->type
) {
4261 case LTTNG_CONSUMER_KERNEL
:
4262 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4264 case LTTNG_CONSUMER64_UST
:
4265 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4267 case LTTNG_CONSUMER32_UST
:
4268 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4271 ERR("Consumer type unknown");
4276 DBG2("Creating consumer directory: %s", path
);
4278 ret
= mkdir(path
, S_IRWXU
);
4280 if (errno
!= EEXIST
) {
4282 ERR("Failed to create %s", path
);
4288 /* Create the kconsumerd error unix socket */
4289 consumer_data
->err_sock
=
4290 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4291 if (consumer_data
->err_sock
< 0) {
4292 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4297 /* File permission MUST be 660 */
4298 ret
= chmod(consumer_data
->err_unix_sock_path
,
4299 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4301 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4311 * Signal handler for the daemon
4313 * Simply stop all worker threads, leaving main() return gracefully after
4314 * joining all threads and calling cleanup().
4316 static void sighandler(int sig
)
4320 DBG("SIGPIPE caught");
4323 DBG("SIGINT caught");
4327 DBG("SIGTERM caught");
4336 * Setup signal handler for :
4337 * SIGINT, SIGTERM, SIGPIPE
4339 static int set_signal_handler(void)
4342 struct sigaction sa
;
4345 if ((ret
= sigemptyset(&sigset
)) < 0) {
4346 PERROR("sigemptyset");
4350 sa
.sa_handler
= sighandler
;
4351 sa
.sa_mask
= sigset
;
4353 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4354 PERROR("sigaction");
4358 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4359 PERROR("sigaction");
4363 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4364 PERROR("sigaction");
4368 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4374 * Set open files limit to unlimited. This daemon can open a large number of
4375 * file descriptors in order to consumer multiple kernel traces.
4377 static void set_ulimit(void)
4382 /* The kernel does not allowed an infinite limit for open files */
4383 lim
.rlim_cur
= 65535;
4384 lim
.rlim_max
= 65535;
4386 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4388 PERROR("failed to set open files limit");
4395 int main(int argc
, char **argv
)
4399 const char *home_path
;
4401 init_kernel_workarounds();
4403 rcu_register_thread();
4405 /* Create thread quit pipe */
4406 if ((ret
= init_thread_quit_pipe()) < 0) {
4410 setup_consumerd_path();
4412 /* Parse arguments */
4414 if ((ret
= parse_args(argc
, argv
) < 0)) {
4427 /* Check if daemon is UID = 0 */
4428 is_root
= !getuid();
4431 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
4433 /* Create global run dir with root access */
4434 ret
= create_lttng_rundir(rundir
);
4439 if (strlen(apps_unix_sock_path
) == 0) {
4440 snprintf(apps_unix_sock_path
, PATH_MAX
,
4441 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4444 if (strlen(client_unix_sock_path
) == 0) {
4445 snprintf(client_unix_sock_path
, PATH_MAX
,
4446 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4449 /* Set global SHM for ust */
4450 if (strlen(wait_shm_path
) == 0) {
4451 snprintf(wait_shm_path
, PATH_MAX
,
4452 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4455 /* Setup kernel consumerd path */
4456 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
4457 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
4458 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
4459 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
4461 DBG2("Kernel consumer err path: %s",
4462 kconsumer_data
.err_unix_sock_path
);
4463 DBG2("Kernel consumer cmd path: %s",
4464 kconsumer_data
.cmd_unix_sock_path
);
4466 home_path
= get_home_dir();
4467 if (home_path
== NULL
) {
4468 /* TODO: Add --socket PATH option */
4469 ERR("Can't get HOME directory for sockets creation.");
4475 * Create rundir from home path. This will create something like
4478 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
4484 ret
= create_lttng_rundir(rundir
);
4489 if (strlen(apps_unix_sock_path
) == 0) {
4490 snprintf(apps_unix_sock_path
, PATH_MAX
,
4491 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4494 /* Set the cli tool unix socket path */
4495 if (strlen(client_unix_sock_path
) == 0) {
4496 snprintf(client_unix_sock_path
, PATH_MAX
,
4497 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4500 /* Set global SHM for ust */
4501 if (strlen(wait_shm_path
) == 0) {
4502 snprintf(wait_shm_path
, PATH_MAX
,
4503 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4507 DBG("Client socket path %s", client_unix_sock_path
);
4508 DBG("Application socket path %s", apps_unix_sock_path
);
4509 DBG("LTTng run directory path: %s", rundir
);
4511 /* 32 bits consumerd path setup */
4512 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
4513 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
4514 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
4515 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
4517 DBG2("UST consumer 32 bits err path: %s",
4518 ustconsumer32_data
.err_unix_sock_path
);
4519 DBG2("UST consumer 32 bits cmd path: %s",
4520 ustconsumer32_data
.cmd_unix_sock_path
);
4522 /* 64 bits consumerd path setup */
4523 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
4524 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
4525 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
4526 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
4528 DBG2("UST consumer 64 bits err path: %s",
4529 ustconsumer64_data
.err_unix_sock_path
);
4530 DBG2("UST consumer 64 bits cmd path: %s",
4531 ustconsumer64_data
.cmd_unix_sock_path
);
4534 * See if daemon already exist.
4536 if ((ret
= check_existing_daemon()) < 0) {
4537 ERR("Already running daemon.\n");
4539 * We do not goto exit because we must not cleanup()
4540 * because a daemon is already running.
4546 * Init UST app hash table. Alloc hash table before this point since
4547 * cleanup() can get called after that point.
4551 /* After this point, we can safely call cleanup() with "goto exit" */
4554 * These actions must be executed as root. We do that *after* setting up
4555 * the sockets path because we MUST make the check for another daemon using
4556 * those paths *before* trying to set the kernel consumer sockets and init
4560 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
4565 /* Setup kernel tracer */
4566 if (!opt_no_kernel
) {
4567 init_kernel_tracer();
4570 /* Set ulimit for open files */
4573 /* init lttng_fd tracking must be done after set_ulimit. */
4576 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
4581 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
4586 if ((ret
= set_signal_handler()) < 0) {
4590 /* Setup the needed unix socket */
4591 if ((ret
= init_daemon_socket()) < 0) {
4595 /* Set credentials to socket */
4596 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
4600 /* Get parent pid if -S, --sig-parent is specified. */
4601 if (opt_sig_parent
) {
4605 /* Setup the kernel pipe for waking up the kernel thread */
4606 if ((ret
= create_kernel_poll_pipe()) < 0) {
4610 /* Setup the thread apps communication pipe. */
4611 if ((ret
= create_apps_cmd_pipe()) < 0) {
4615 /* Init UST command queue. */
4616 cds_wfq_init(&ust_cmd_queue
.queue
);
4619 * Get session list pointer. This pointer MUST NOT be free(). This list is
4620 * statically declared in session.c
4622 session_list_ptr
= session_get_list();
4624 /* Set up max poll set size */
4625 lttng_poll_set_max_size();
4627 /* Create thread to manage the client socket */
4628 ret
= pthread_create(&client_thread
, NULL
,
4629 thread_manage_clients
, (void *) NULL
);
4631 PERROR("pthread_create clients");
4635 /* Create thread to dispatch registration */
4636 ret
= pthread_create(&dispatch_thread
, NULL
,
4637 thread_dispatch_ust_registration
, (void *) NULL
);
4639 PERROR("pthread_create dispatch");
4643 /* Create thread to manage application registration. */
4644 ret
= pthread_create(®_apps_thread
, NULL
,
4645 thread_registration_apps
, (void *) NULL
);
4647 PERROR("pthread_create registration");
4651 /* Create thread to manage application socket */
4652 ret
= pthread_create(&apps_thread
, NULL
,
4653 thread_manage_apps
, (void *) NULL
);
4655 PERROR("pthread_create apps");
4659 /* Create kernel thread to manage kernel event */
4660 ret
= pthread_create(&kernel_thread
, NULL
,
4661 thread_manage_kernel
, (void *) NULL
);
4663 PERROR("pthread_create kernel");
4667 ret
= pthread_join(kernel_thread
, &status
);
4669 PERROR("pthread_join");
4670 goto error
; /* join error, exit without cleanup */
4674 ret
= pthread_join(apps_thread
, &status
);
4676 PERROR("pthread_join");
4677 goto error
; /* join error, exit without cleanup */
4681 ret
= pthread_join(reg_apps_thread
, &status
);
4683 PERROR("pthread_join");
4684 goto error
; /* join error, exit without cleanup */
4688 ret
= pthread_join(dispatch_thread
, &status
);
4690 PERROR("pthread_join");
4691 goto error
; /* join error, exit without cleanup */
4695 ret
= pthread_join(client_thread
, &status
);
4697 PERROR("pthread_join");
4698 goto error
; /* join error, exit without cleanup */
4701 ret
= join_consumer_thread(&kconsumer_data
);
4703 PERROR("join_consumer");
4704 goto error
; /* join error, exit without cleanup */
4710 * cleanup() is called when no other thread is running.
4712 rcu_thread_online();
4714 rcu_thread_offline();
4715 rcu_unregister_thread();