2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
25 #include <semaphore.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
35 #include <sys/types.h>
37 #include <urcu/futex.h>
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
48 #include "compat/poll.h"
52 #include "hashtable.h"
53 #include "kernel-ctl.h"
54 #include "lttng-sessiond.h"
60 #define CONSUMERD_FILE "lttng-consumerd"
62 struct consumer_data
{
63 enum lttng_consumer_type type
;
65 pthread_t thread
; /* Worker thread interacting with the consumer */
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex
;
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path
[PATH_MAX
];
77 char cmd_unix_sock_path
[PATH_MAX
];
81 const char default_home_dir
[] = DEFAULT_HOME_DIR
;
82 const char default_tracing_group
[] = LTTNG_DEFAULT_TRACING_GROUP
;
83 const char default_ust_sock_dir
[] = DEFAULT_UST_SOCK_DIR
;
84 const char default_global_apps_pipe
[] = DEFAULT_GLOBAL_APPS_PIPE
;
87 int opt_verbose
; /* Not static for lttngerr.h */
88 int opt_verbose_consumer
; /* Not static for lttngerr.h */
89 int opt_quiet
; /* Not static for lttngerr.h */
92 const char *opt_tracing_group
;
93 static int opt_sig_parent
;
94 static int opt_daemon
;
95 static int is_root
; /* Set to 1 if the daemon is running as root */
96 static pid_t ppid
; /* Parent PID for --sig-parent option */
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data
= {
100 .type
= LTTNG_CONSUMER_KERNEL
,
101 .err_unix_sock_path
= KCONSUMERD_ERR_SOCK_PATH
,
102 .cmd_unix_sock_path
= KCONSUMERD_CMD_SOCK_PATH
,
104 static struct consumer_data ustconsumer64_data
= {
105 .type
= LTTNG_CONSUMER64_UST
,
106 .err_unix_sock_path
= USTCONSUMERD64_ERR_SOCK_PATH
,
107 .cmd_unix_sock_path
= USTCONSUMERD64_CMD_SOCK_PATH
,
109 static struct consumer_data ustconsumer32_data
= {
110 .type
= LTTNG_CONSUMER32_UST
,
111 .err_unix_sock_path
= USTCONSUMERD32_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= USTCONSUMERD32_CMD_SOCK_PATH
,
115 static int dispatch_thread_exit
;
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path
[PATH_MAX
];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path
[PATH_MAX
];
121 /* global wait shm path for UST */
122 static char wait_shm_path
[PATH_MAX
];
124 /* Sockets and FDs */
125 static int client_sock
;
126 static int apps_sock
;
127 static int kernel_tracer_fd
;
128 static int kernel_poll_pipe
[2];
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
134 static int thread_quit_pipe
[2];
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
140 static int apps_cmd_pipe
[2];
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread
;
144 static pthread_t reg_apps_thread
;
145 static pthread_t client_thread
;
146 static pthread_t kernel_thread
;
147 static pthread_t dispatch_thread
;
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
157 static struct ust_cmd_queue ust_cmd_queue
;
160 * Pointer initialized before thread creation.
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
169 static struct ltt_session_list
*session_list_ptr
;
171 int ust_consumerd64_fd
= -1;
172 int ust_consumerd32_fd
= -1;
174 static const char *consumerd32_path
=
175 __stringify(CONFIG_CONSUMERD32_PATH
);
176 static const char *consumerd64_path
=
177 __stringify(CONFIG_CONSUMERD64_PATH
);
178 static const char *consumerd32_libdir
=
179 __stringify(CONFIG_CONSUMERD32_LIBDIR
);
180 static const char *consumerd64_libdir
=
181 __stringify(CONFIG_CONSUMERD64_LIBDIR
);
184 void setup_consumerd_path(void)
186 const char *path
, *libdir
;
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
193 #if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_path
[0]) {
195 consumerd32_bindir
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
197 if (!consumerd32_libdir
[0]) {
198 consumerd32_libdir
= INSTALL_LIB_PATH
;
200 #elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_path
[0]) {
202 consumerd64_path
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
204 if (!consumerd64_libdir
[0]) {
205 consumerd64_libdir
= INSTALL_LIB_PATH
;
208 #error "Unknown bitness"
212 * runtime env. var. overrides the build default.
214 path
= getenv("LTTNG_CONSUMERD32_PATH");
216 consumerd32_path
= path
;
218 path
= getenv("LTTNG_CONSUMERD64_PATH");
220 consumerd64_path
= path
;
222 libdir
= getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
224 consumerd32_libdir
= libdir
;
226 libdir
= getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
228 consumerd64_libdir
= libdir
;
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
235 static int create_thread_poll_set(struct lttng_poll_event
*events
,
240 if (events
== NULL
|| size
== 0) {
245 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
251 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
);
263 * Check if the thread quit pipe was triggered.
265 * Return 1 if it was triggered else 0;
267 static int check_thread_quit_pipe(int fd
, uint32_t events
)
269 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
277 * Remove modules in reverse load order.
279 static int modprobe_remove_kernel_modules(void)
284 for (i
= ARRAY_SIZE(kernel_modules_list
) - 1; i
>= 0; i
--) {
285 ret
= snprintf(modprobe
, sizeof(modprobe
),
286 "/sbin/modprobe -r -q %s",
287 kernel_modules_list
[i
].name
);
289 perror("snprintf modprobe -r");
292 modprobe
[sizeof(modprobe
) - 1] = '\0';
293 ret
= system(modprobe
);
295 ERR("Unable to launch modprobe -r for module %s",
296 kernel_modules_list
[i
].name
);
297 } else if (kernel_modules_list
[i
].required
298 && WEXITSTATUS(ret
) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list
[i
].name
);
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list
[i
].name
);
312 * Return group ID of the tracing group or -1 if not found.
314 static gid_t
allowed_group(void)
318 if (opt_tracing_group
) {
319 grp
= getgrnam(opt_tracing_group
);
321 grp
= getgrnam(default_tracing_group
);
331 * Init thread quit pipe.
333 * Return -1 on error or 0 if all pipes are created.
335 static int init_thread_quit_pipe(void)
339 ret
= pipe2(thread_quit_pipe
, O_CLOEXEC
);
341 perror("thread quit pipe");
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
353 static void teardown_kernel_session(struct ltt_session
*session
)
355 if (!session
->kernel_session
) {
356 DBG3("No kernel session when tearingdown session");
360 DBG("Tearing down kernel session");
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
366 if (session
->kernel_session
->consumer_fd
!= kconsumer_data
.cmd_sock
) {
367 lttcomm_close_unix_sock(session
->kernel_session
->consumer_fd
);
370 trace_kernel_destroy_session(session
->kernel_session
);
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
377 static void teardown_ust_session(struct ltt_session
*session
)
381 if (!session
->ust_session
) {
382 DBG3("No UST session when tearingdown session");
386 DBG("Tearing down UST session(s)");
388 ret
= ust_app_destroy_trace_all(session
->ust_session
);
390 ERR("Error in ust_app_destroy_trace_all");
393 trace_ust_destroy_session(session
->ust_session
);
397 * Stop all threads by closing the thread quit pipe.
399 static void stop_threads(void)
403 /* Stopping all threads */
404 DBG("Terminating all threads");
405 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
407 ERR("write error on thread quit pipe");
410 /* Dispatch thread */
411 dispatch_thread_exit
= 1;
412 futex_nto1_wake(&ust_cmd_queue
.futex
);
418 static void cleanup(void)
422 struct ltt_session
*sess
, *stmp
;
427 DBG("Removing %s directory", LTTNG_RUNDIR
);
428 ret
= asprintf(&cmd
, "rm -rf " LTTNG_RUNDIR
);
430 ERR("asprintf failed. Something is really wrong!");
433 /* Remove lttng run directory */
436 ERR("Unable to clean " LTTNG_RUNDIR
);
440 DBG("Cleaning up all session");
442 /* Destroy session list mutex */
443 if (session_list_ptr
!= NULL
) {
444 pthread_mutex_destroy(&session_list_ptr
->lock
);
446 /* Cleanup ALL session */
447 cds_list_for_each_entry_safe(sess
, stmp
,
448 &session_list_ptr
->head
, list
) {
449 teardown_kernel_session(sess
);
450 teardown_ust_session(sess
);
455 DBG("Closing all UST sockets");
456 ust_app_clean_list();
458 pthread_mutex_destroy(&kconsumer_data
.pid_mutex
);
460 DBG("Closing kernel fd");
461 close(kernel_tracer_fd
);
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
468 close(thread_quit_pipe
[0]);
469 close(thread_quit_pipe
[1]);
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
479 * Send data on a unix socket using the liblttsessiondcomm API.
481 * Return lttcomm error code.
483 static int send_unix_sock(int sock
, void *buf
, size_t len
)
485 /* Check valid length */
490 return lttcomm_send_unix_sock(sock
, buf
, len
);
494 * Free memory of a command context structure.
496 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
498 DBG("Clean command context structure");
500 if ((*cmd_ctx
)->llm
) {
501 free((*cmd_ctx
)->llm
);
503 if ((*cmd_ctx
)->lsm
) {
504 free((*cmd_ctx
)->lsm
);
512 * Send all stream fds of kernel channel to the consumer.
514 static int send_kconsumer_channel_streams(struct consumer_data
*consumer_data
,
515 int sock
, struct ltt_kernel_channel
*channel
)
518 struct ltt_kernel_stream
*stream
;
519 struct lttcomm_consumer_msg lkm
;
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel
->channel
->name
);
525 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
526 lkm
.u
.channel
.channel_key
= channel
->fd
;
527 lkm
.u
.channel
.max_sb_size
= channel
->channel
->attr
.subbuf_size
;
528 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm
.u
.channel
.channel_key
);
530 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
532 perror("send consumer channel");
537 cds_list_for_each_entry(stream
, &channel
->stream_list
.head
, list
) {
541 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
542 lkm
.u
.stream
.channel_key
= channel
->fd
;
543 lkm
.u
.stream
.stream_key
= stream
->fd
;
544 lkm
.u
.stream
.state
= stream
->state
;
545 lkm
.u
.stream
.output
= channel
->channel
->attr
.output
;
546 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
547 strncpy(lkm
.u
.stream
.path_name
, stream
->pathname
, PATH_MAX
- 1);
548 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm
.u
.stream
.stream_key
);
550 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
552 perror("send consumer stream");
555 ret
= lttcomm_send_fds_unix_sock(sock
, &stream
->fd
, 1);
557 perror("send consumer stream ancillary data");
562 DBG("consumer channel streams sent");
571 * Send all stream fds of the kernel session to the consumer.
573 static int send_kconsumer_session_streams(struct consumer_data
*consumer_data
,
574 struct ltt_kernel_session
*session
)
577 struct ltt_kernel_channel
*chan
;
578 struct lttcomm_consumer_msg lkm
;
579 int sock
= session
->consumer_fd
;
581 DBG("Sending metadata stream fd");
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session
->consumer_fd
== 0) {
585 session
->consumer_fd
= consumer_data
->cmd_sock
;
588 if (session
->metadata_stream_fd
!= 0) {
589 /* Send metadata channel fd */
590 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_CHANNEL
;
591 lkm
.u
.channel
.channel_key
= session
->metadata
->fd
;
592 lkm
.u
.channel
.max_sb_size
= session
->metadata
->conf
->attr
.subbuf_size
;
593 lkm
.u
.channel
.mmap_len
= 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm
.u
.stream
.stream_key
);
595 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
597 perror("send consumer channel");
601 /* Send metadata stream fd */
602 lkm
.cmd_type
= LTTNG_CONSUMER_ADD_STREAM
;
603 lkm
.u
.stream
.channel_key
= session
->metadata
->fd
;
604 lkm
.u
.stream
.stream_key
= session
->metadata_stream_fd
;
605 lkm
.u
.stream
.state
= LTTNG_CONSUMER_ACTIVE_STREAM
;
606 lkm
.u
.stream
.output
= DEFAULT_KERNEL_CHANNEL_OUTPUT
;
607 lkm
.u
.stream
.mmap_len
= 0; /* for kernel */
608 strncpy(lkm
.u
.stream
.path_name
, session
->metadata
->pathname
, PATH_MAX
- 1);
609 lkm
.u
.stream
.path_name
[PATH_MAX
- 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm
.u
.stream
.stream_key
);
611 ret
= lttcomm_send_unix_sock(sock
, &lkm
, sizeof(lkm
));
613 perror("send consumer stream");
616 ret
= lttcomm_send_fds_unix_sock(sock
, &session
->metadata_stream_fd
, 1);
618 perror("send consumer stream");
623 cds_list_for_each_entry(chan
, &session
->channel_list
.head
, list
) {
624 ret
= send_kconsumer_channel_streams(consumer_data
, sock
, chan
);
630 DBG("consumer fds (metadata and channel streams) sent");
639 * Notify UST applications using the shm mmap futex.
641 static int notify_ust_apps(int active
)
645 DBG("Notifying applications of session daemon state: %d", active
);
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
649 if (wait_shm_mmap
== NULL
) {
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
656 /* Apps notified successfully */
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
668 * Return total size of the buffer pointed by buf.
670 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
676 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
677 if (cmd_ctx
->llm
== NULL
) {
683 /* Copy common data */
684 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
685 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
687 cmd_ctx
->llm
->data_size
= size
;
688 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
700 static int update_kernel_poll(struct lttng_poll_event
*events
)
703 struct ltt_session
*session
;
704 struct ltt_kernel_channel
*channel
;
706 DBG("Updating kernel poll set");
709 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
710 session_lock(session
);
711 if (session
->kernel_session
== NULL
) {
712 session_unlock(session
);
716 cds_list_for_each_entry(channel
,
717 &session
->kernel_session
->channel_list
.head
, list
) {
718 /* Add channel fd to the kernel poll set */
719 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
721 session_unlock(session
);
724 DBG("Channel fd %d added to kernel set", channel
->fd
);
726 session_unlock(session
);
728 session_unlock_list();
733 session_unlock_list();
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
741 * Useful for CPU hotplug feature.
743 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
746 struct ltt_session
*session
;
747 struct ltt_kernel_channel
*channel
;
749 DBG("Updating kernel streams for channel fd %d", fd
);
752 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
753 session_lock(session
);
754 if (session
->kernel_session
== NULL
) {
755 session_unlock(session
);
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session
->kernel_session
->consumer_fd
== 0) {
761 session
->kernel_session
->consumer_fd
= consumer_data
->cmd_sock
;
764 cds_list_for_each_entry(channel
,
765 &session
->kernel_session
->channel_list
.head
, list
) {
766 if (channel
->fd
== fd
) {
767 DBG("Channel found, updating kernel streams");
768 ret
= kernel_open_channel_stream(channel
);
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
778 if (session
->kernel_session
->consumer_fds_sent
== 1) {
779 ret
= send_kconsumer_channel_streams(consumer_data
,
780 session
->kernel_session
->consumer_fd
, channel
);
788 session_unlock(session
);
790 session_unlock_list();
794 session_unlock(session
);
795 session_unlock_list();
800 * For each tracing session, update newly registered apps.
802 static void update_ust_app(int app_sock
)
804 struct ltt_session
*sess
, *stmp
;
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
808 if (sess
->ust_session
) {
809 ust_app_global_update(sess
->ust_session
, app_sock
);
815 * This thread manage event coming from the kernel.
817 * Features supported in this thread:
820 static void *thread_manage_kernel(void *data
)
822 int ret
, i
, pollfd
, update_poll_flag
= 1;
823 uint32_t revents
, nb_fd
;
825 struct lttng_poll_event events
;
827 DBG("Thread manage kernel started");
829 ret
= create_thread_poll_set(&events
, 2);
834 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
840 if (update_poll_flag
== 1) {
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
847 ret
= update_kernel_poll(&events
);
851 update_poll_flag
= 0;
854 nb_fd
= LTTNG_POLL_GETNB(&events
);
856 DBG("Thread kernel polling on %d fds", nb_fd
);
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events
);
861 /* Poll infinite value of time */
862 ret
= lttng_poll_wait(&events
, -1);
865 } else if (ret
== 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
872 for (i
= 0; i
< nb_fd
; i
++) {
873 /* Fetch once the poll data */
874 revents
= LTTNG_POLL_GETEV(&events
, i
);
875 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret
= check_thread_quit_pipe(pollfd
, revents
);
883 /* Check for data on kernel pipe */
884 if (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
885 ret
= read(kernel_poll_pipe
[0], &tmp
, 1);
886 update_poll_flag
= 1;
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
893 if (revents
& LPOLLIN
) {
894 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe
[0]);
911 close(kernel_poll_pipe
[1]);
913 lttng_poll_clean(&events
);
919 * This thread manage the consumer error sent back to the session daemon.
921 static void *thread_manage_consumer(void *data
)
923 int sock
= 0, i
, ret
, pollfd
;
924 uint32_t revents
, nb_fd
;
925 enum lttcomm_return_code code
;
926 struct lttng_poll_event events
;
927 struct consumer_data
*consumer_data
= data
;
929 DBG("[thread] Manage consumer started");
931 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
940 ret
= create_thread_poll_set(&events
, 2);
945 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
950 nb_fd
= LTTNG_POLL_GETNB(&events
);
952 /* Inifinite blocking call, waiting for transmission */
953 ret
= lttng_poll_wait(&events
, -1);
958 for (i
= 0; i
< nb_fd
; i
++) {
959 /* Fetch once the poll data */
960 revents
= LTTNG_POLL_GETEV(&events
, i
);
961 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret
= check_thread_quit_pipe(pollfd
, revents
);
969 /* Event on the registration socket */
970 if (pollfd
== consumer_data
->err_sock
) {
971 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
972 ERR("consumer err socket poll error");
978 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
983 DBG2("Receiving code from consumer err_sock");
985 /* Getting status code from kconsumerd */
986 ret
= lttcomm_recv_unix_sock(sock
, &code
,
987 sizeof(enum lttcomm_return_code
));
992 if (code
== CONSUMERD_COMMAND_SOCK_READY
) {
993 consumer_data
->cmd_sock
=
994 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
995 if (consumer_data
->cmd_sock
< 0) {
996 sem_post(&consumer_data
->sem
);
997 PERROR("consumer connect");
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data
->sem
);
1002 DBG("consumer command socket ready");
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code
));
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1015 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1020 /* Update number of fd */
1021 nb_fd
= LTTNG_POLL_GETNB(&events
);
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret
= lttng_poll_wait(&events
, -1);
1029 for (i
= 0; i
< nb_fd
; i
++) {
1030 /* Fetch once the poll data */
1031 revents
= LTTNG_POLL_GETEV(&events
, i
);
1032 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret
= check_thread_quit_pipe(pollfd
, revents
);
1040 /* Event on the kconsumerd socket */
1041 if (pollfd
== sock
) {
1042 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1043 ERR("consumer err socket second poll error");
1049 /* Wait for any kconsumerd error */
1050 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1051 sizeof(enum lttcomm_return_code
));
1053 ERR("consumer closed the command socket");
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code
));
1060 DBG("consumer thread dying");
1061 close(consumer_data
->err_sock
);
1062 close(consumer_data
->cmd_sock
);
1065 unlink(consumer_data
->err_unix_sock_path
);
1066 unlink(consumer_data
->cmd_unix_sock_path
);
1067 consumer_data
->pid
= 0;
1069 lttng_poll_clean(&events
);
1075 * This thread manage application communication.
1077 static void *thread_manage_apps(void *data
)
1080 uint32_t revents
, nb_fd
;
1081 struct ust_command ust_cmd
;
1082 struct lttng_poll_event events
;
1084 DBG("[thread] Manage application started");
1086 rcu_register_thread();
1087 rcu_thread_online();
1089 ret
= create_thread_poll_set(&events
, 2);
1094 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events
);
1103 nb_fd
= LTTNG_POLL_GETNB(&events
);
1105 DBG("Apps thread polling on %d fds", nb_fd
);
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret
= lttng_poll_wait(&events
, -1);
1113 for (i
= 0; i
< nb_fd
; i
++) {
1114 /* Fetch once the poll data */
1115 revents
= LTTNG_POLL_GETEV(&events
, i
);
1116 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret
= check_thread_quit_pipe(pollfd
, revents
);
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd
== apps_cmd_pipe
[0]) {
1126 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1127 ERR("Apps command pipe error");
1129 } else if (revents
& LPOLLIN
) {
1131 ret
= read(apps_cmd_pipe
[0], &ust_cmd
, sizeof(ust_cmd
));
1132 if (ret
< 0 || ret
< sizeof(ust_cmd
)) {
1133 perror("read apps cmd pipe");
1137 /* Register applicaton to the session daemon */
1138 ret
= ust_app_register(&ust_cmd
.reg_msg
,
1140 if (ret
== -ENOMEM
) {
1142 } else if (ret
< 0) {
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1150 update_ust_app(ust_cmd
.sock
);
1152 ret
= ustctl_register_done(ust_cmd
.sock
);
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1158 ust_app_unregister(ust_cmd
.sock
);
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1164 ret
= lttng_poll_add(&events
, ust_cmd
.sock
, 0);
1169 DBG("Apps with sock %d added to poll set",
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1180 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1181 /* Removing from the poll set */
1182 ret
= lttng_poll_del(&events
, pollfd
);
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd
);
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe
[0]);
1198 close(apps_cmd_pipe
[1]);
1200 lttng_poll_clean(&events
);
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1211 static void *thread_dispatch_ust_registration(void *data
)
1214 struct cds_wfq_node
*node
;
1215 struct ust_command
*ust_cmd
= NULL
;
1217 DBG("[thread] Dispatch UST command started");
1219 while (!dispatch_thread_exit
) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1224 /* Dequeue command for registration */
1225 node
= cds_wfq_dequeue_blocking(&ust_cmd_queue
.queue
);
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1232 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1237 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1238 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1239 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1245 ret
= write(apps_cmd_pipe
[1], ust_cmd
,
1246 sizeof(struct ust_command
));
1248 perror("write apps cmd pipe");
1249 if (errno
== EBADF
) {
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1260 } while (node
!= NULL
);
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue
.futex
);
1267 DBG("Dispatch thread dying");
1272 * This thread manage application registration.
1274 static void *thread_registration_apps(void *data
)
1276 int sock
= 0, i
, ret
, pollfd
;
1277 uint32_t revents
, nb_fd
;
1278 struct lttng_poll_event events
;
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1283 struct ust_command
*ust_cmd
= NULL
;
1285 DBG("[thread] Manage application registration started");
1287 ret
= lttcomm_listen_unix_sock(apps_sock
);
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1296 ret
= create_thread_poll_set(&events
, 2);
1301 /* Add the application registration socket */
1302 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
1307 /* Notify all applications to register */
1308 ret
= notify_ust_apps(1);
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1316 DBG("Accepting application registration");
1318 nb_fd
= LTTNG_POLL_GETNB(&events
);
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret
= lttng_poll_wait(&events
, -1);
1326 for (i
= 0; i
< nb_fd
; i
++) {
1327 /* Fetch once the poll data */
1328 revents
= LTTNG_POLL_GETEV(&events
, i
);
1329 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret
= check_thread_quit_pipe(pollfd
, revents
);
1337 /* Event on the registration socket */
1338 if (pollfd
== apps_sock
) {
1339 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1340 ERR("Register apps socket poll error");
1342 } else if (revents
& LPOLLIN
) {
1343 sock
= lttcomm_accept_unix_sock(apps_sock
);
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd
= zmalloc(sizeof(struct ust_command
));
1350 if (ust_cmd
== NULL
) {
1351 perror("ust command zmalloc");
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1359 ret
= lttcomm_recv_unix_sock(sock
, &ust_cmd
->reg_msg
,
1360 sizeof(struct ust_register_msg
));
1361 if (ret
< 0 || ret
< sizeof(struct ust_register_msg
)) {
1363 perror("lttcomm_recv_unix_sock register apps");
1365 ERR("Wrong size received on apps register");
1372 ust_cmd
->sock
= sock
;
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1377 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1378 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1379 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1385 cds_wfq_enqueue(&ust_cmd_queue
.queue
, &ust_cmd
->node
);
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1391 futex_nto1_wake(&ust_cmd_queue
.futex
);
1398 DBG("UST Registration thread dying");
1400 /* Notify that the registration thread is gone */
1405 unlink(apps_unix_sock_path
);
1407 lttng_poll_clean(&events
);
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1416 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
1419 struct timespec timeout
;
1421 timeout
.tv_sec
= DEFAULT_SEM_WAIT_TIMEOUT
;
1422 timeout
.tv_nsec
= 0;
1424 /* Setup semaphore */
1425 ret
= sem_init(&consumer_data
->sem
, 0, 0);
1427 PERROR("sem_init consumer semaphore");
1431 ret
= pthread_create(&consumer_data
->thread
, NULL
,
1432 thread_manage_consumer
, consumer_data
);
1434 PERROR("pthread_create consumer");
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret
= clock_gettime(CLOCK_REALTIME
, &timeout
);
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret
= sem_wait(&consumer_data
->sem
);
1446 /* Normal timeout if the gettime was successful */
1447 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
1448 ret
= sem_timedwait(&consumer_data
->sem
, &timeout
);
1452 if (errno
== ETIMEDOUT
) {
1454 * Call has timed out so we kill the kconsumerd_thread and return
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret
= pthread_cancel(consumer_data
->thread
);
1460 PERROR("pthread_cancel consumer thread");
1463 PERROR("semaphore wait failed consumer thread");
1468 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1469 if (consumer_data
->pid
== 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1474 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1483 * Join consumer thread
1485 static int join_consumer_thread(struct consumer_data
*consumer_data
)
1490 if (consumer_data
->pid
!= 0) {
1491 ret
= kill(consumer_data
->pid
, SIGTERM
);
1493 ERR("Error killing consumer daemon");
1496 return pthread_join(consumer_data
->thread
, &status
);
1503 * Fork and exec a consumer daemon (consumerd).
1505 * Return pid if successful else -1.
1507 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
1511 const char *verbosity
;
1513 DBG("Spawning consumerd");
1520 if (opt_verbose
> 1 || opt_verbose_consumer
) {
1521 verbosity
= "--verbose";
1523 verbosity
= "--quiet";
1525 switch (consumer_data
->type
) {
1526 case LTTNG_CONSUMER_KERNEL
:
1527 execl(INSTALL_BIN_PATH
"/lttng-consumerd",
1528 "lttng-consumerd", verbosity
, "-k",
1529 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1530 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1533 case LTTNG_CONSUMER64_UST
:
1535 execl(consumerd64_path
, verbosity
, "-u",
1536 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1537 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1541 case LTTNG_CONSUMER32_UST
:
1543 execl(consumerd32_path
, verbosity
, "-u",
1544 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
1545 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
1550 perror("unknown consumer type");
1554 perror("kernel start consumer exec");
1557 } else if (pid
> 0) {
1560 perror("start consumer fork");
1567 * Spawn the consumerd daemon and session daemon thread.
1569 static int start_consumerd(struct consumer_data
*consumer_data
)
1573 pthread_mutex_lock(&consumer_data
->pid_mutex
);
1574 if (consumer_data
->pid
!= 0) {
1575 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1579 ret
= spawn_consumerd(consumer_data
);
1581 ERR("Spawning consumerd failed");
1582 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1586 /* Setting up the consumer_data pid */
1587 consumer_data
->pid
= ret
;
1588 DBG2("Consumer pid %d", consumer_data
->pid
);
1589 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
1591 DBG2("Spawning consumer control thread");
1592 ret
= spawn_consumer_thread(consumer_data
);
1594 ERR("Fatal error spawning consumer control thread");
1606 * modprobe_kernel_modules
1608 static int modprobe_kernel_modules(void)
1613 for (i
= 0; i
< ARRAY_SIZE(kernel_modules_list
); i
++) {
1614 ret
= snprintf(modprobe
, sizeof(modprobe
),
1615 "/sbin/modprobe %s%s",
1616 kernel_modules_list
[i
].required
? "" : "-q ",
1617 kernel_modules_list
[i
].name
);
1619 perror("snprintf modprobe");
1622 modprobe
[sizeof(modprobe
) - 1] = '\0';
1623 ret
= system(modprobe
);
1625 ERR("Unable to launch modprobe for module %s",
1626 kernel_modules_list
[i
].name
);
1627 } else if (kernel_modules_list
[i
].required
1628 && WEXITSTATUS(ret
) != 0) {
1629 ERR("Unable to load module %s",
1630 kernel_modules_list
[i
].name
);
1632 DBG("Modprobe successfully %s",
1633 kernel_modules_list
[i
].name
);
1644 static int mount_debugfs(char *path
)
1647 char *type
= "debugfs";
1649 ret
= mkdir_recursive(path
, S_IRWXU
| S_IRWXG
, geteuid(), getegid());
1651 PERROR("Cannot create debugfs path");
1655 ret
= mount(type
, path
, type
, 0, NULL
);
1657 PERROR("Cannot mount debugfs");
1661 DBG("Mounted debugfs successfully at %s", path
);
1668 * Setup necessary data for kernel tracer action.
1670 static void init_kernel_tracer(void)
1673 char *proc_mounts
= "/proc/mounts";
1675 char *debugfs_path
= NULL
, *lttng_path
= NULL
;
1678 /* Detect debugfs */
1679 fp
= fopen(proc_mounts
, "r");
1681 ERR("Unable to probe %s", proc_mounts
);
1685 while (fgets(line
, sizeof(line
), fp
) != NULL
) {
1686 if (strstr(line
, "debugfs") != NULL
) {
1687 /* Remove first string */
1689 /* Dup string here so we can reuse line later on */
1690 debugfs_path
= strdup(strtok(NULL
, " "));
1691 DBG("Got debugfs path : %s", debugfs_path
);
1698 /* Mount debugfs if needded */
1699 if (debugfs_path
== NULL
) {
1700 ret
= asprintf(&debugfs_path
, "/mnt/debugfs");
1702 perror("asprintf debugfs path");
1705 ret
= mount_debugfs(debugfs_path
);
1707 perror("Cannot mount debugfs");
1712 /* Modprobe lttng kernel modules */
1713 ret
= modprobe_kernel_modules();
1718 /* Setup lttng kernel path */
1719 ret
= asprintf(<tng_path
, "%s/lttng", debugfs_path
);
1721 perror("asprintf lttng path");
1725 /* Open debugfs lttng */
1726 kernel_tracer_fd
= open(lttng_path
, O_RDWR
);
1727 if (kernel_tracer_fd
< 0) {
1728 DBG("Failed to open %s", lttng_path
);
1734 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
1744 WARN("No kernel tracer available");
1745 kernel_tracer_fd
= 0;
1750 * Init tracing by creating trace directory and sending fds kernel consumer.
1752 static int init_kernel_tracing(struct ltt_kernel_session
*session
)
1756 if (session
->consumer_fds_sent
== 0) {
1758 * Assign default kernel consumer socket if no consumer assigned to the
1759 * kernel session. At this point, it's NOT suppose to be 0 but this is
1760 * an extra security check.
1762 if (session
->consumer_fd
== 0) {
1763 session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1766 ret
= send_kconsumer_session_streams(&kconsumer_data
, session
);
1768 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
1772 session
->consumer_fds_sent
= 1;
1780 * Create an UST session and add it to the session ust list.
1782 static int create_ust_session(struct ltt_session
*session
,
1783 struct lttng_domain
*domain
)
1787 struct ltt_ust_session
*lus
= NULL
;
1789 switch (domain
->type
) {
1790 case LTTNG_DOMAIN_UST
:
1793 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
1797 DBG("Creating UST session");
1800 lus
= trace_ust_create_session(session
->path
, uid
, domain
);
1802 ret
= LTTCOMM_UST_SESS_FAIL
;
1806 ret
= mkdir_recursive(lus
->pathname
, S_IRWXU
| S_IRWXG
,
1807 geteuid(), allowed_group());
1809 if (ret
!= -EEXIST
) {
1810 ERR("Trace directory creation error");
1811 ret
= LTTCOMM_UST_SESS_FAIL
;
1816 /* The domain type dictate different actions on session creation */
1817 switch (domain
->type
) {
1818 case LTTNG_DOMAIN_UST
:
1819 /* No ustctl for the global UST domain */
1822 ERR("Unknown UST domain on create session %d", domain
->type
);
1825 session
->ust_session
= lus
;
1835 * Create a kernel tracer session then create the default channel.
1837 static int create_kernel_session(struct ltt_session
*session
)
1841 DBG("Creating kernel session");
1843 ret
= kernel_create_session(session
, kernel_tracer_fd
);
1845 ret
= LTTCOMM_KERN_SESS_FAIL
;
1849 /* Set kernel consumer socket fd */
1850 if (kconsumer_data
.cmd_sock
) {
1851 session
->kernel_session
->consumer_fd
= kconsumer_data
.cmd_sock
;
1854 ret
= mkdir_recursive(session
->kernel_session
->trace_path
,
1855 S_IRWXU
| S_IRWXG
, geteuid(), allowed_group());
1857 if (ret
!= -EEXIST
) {
1858 ERR("Trace directory creation error");
1868 * Using the session list, filled a lttng_session array to send back to the
1869 * client for session listing.
1871 * The session list lock MUST be acquired before calling this function. Use
1872 * session_lock_list() and session_unlock_list().
1874 static void list_lttng_sessions(struct lttng_session
*sessions
)
1877 struct ltt_session
*session
;
1879 DBG("Getting all available session");
1881 * Iterate over session list and append data after the control struct in
1884 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
1885 strncpy(sessions
[i
].path
, session
->path
, PATH_MAX
);
1886 sessions
[i
].path
[PATH_MAX
- 1] = '\0';
1887 strncpy(sessions
[i
].name
, session
->name
, NAME_MAX
);
1888 sessions
[i
].name
[NAME_MAX
- 1] = '\0';
1889 sessions
[i
].enabled
= session
->enabled
;
1895 * Fill lttng_channel array of all channels.
1897 static void list_lttng_channels(int domain
, struct ltt_session
*session
,
1898 struct lttng_channel
*channels
)
1901 struct ltt_kernel_channel
*kchan
;
1903 DBG("Listing channels for session %s", session
->name
);
1906 case LTTNG_DOMAIN_KERNEL
:
1907 /* Kernel channels */
1908 if (session
->kernel_session
!= NULL
) {
1909 cds_list_for_each_entry(kchan
,
1910 &session
->kernel_session
->channel_list
.head
, list
) {
1911 /* Copy lttng_channel struct to array */
1912 memcpy(&channels
[i
], kchan
->channel
, sizeof(struct lttng_channel
));
1913 channels
[i
].enabled
= kchan
->enabled
;
1918 case LTTNG_DOMAIN_UST
:
1920 struct cds_lfht_iter iter
;
1921 struct ltt_ust_channel
*uchan
;
1923 cds_lfht_for_each_entry(session
->ust_session
->domain_global
.channels
,
1924 &iter
, uchan
, node
) {
1925 strncpy(channels
[i
].name
, uchan
->name
, LTTNG_SYMBOL_NAME_LEN
);
1926 channels
[i
].attr
.overwrite
= uchan
->attr
.overwrite
;
1927 channels
[i
].attr
.subbuf_size
= uchan
->attr
.subbuf_size
;
1928 channels
[i
].attr
.num_subbuf
= uchan
->attr
.num_subbuf
;
1929 channels
[i
].attr
.switch_timer_interval
=
1930 uchan
->attr
.switch_timer_interval
;
1931 channels
[i
].attr
.read_timer_interval
=
1932 uchan
->attr
.read_timer_interval
;
1933 channels
[i
].enabled
= uchan
->enabled
;
1934 switch (uchan
->attr
.output
) {
1935 case LTTNG_UST_MMAP
:
1937 channels
[i
].attr
.output
= LTTNG_EVENT_MMAP
;
1950 * Create a list of ust global domain events.
1952 static int list_lttng_ust_global_events(char *channel_name
,
1953 struct ltt_ust_domain_global
*ust_global
, struct lttng_event
**events
)
1956 unsigned int nb_event
= 0;
1957 struct cds_lfht_iter iter
;
1958 struct cds_lfht_node
*node
;
1959 struct ltt_ust_channel
*uchan
;
1960 struct ltt_ust_event
*uevent
;
1961 struct lttng_event
*tmp
;
1963 DBG("Listing UST global events for channel %s", channel_name
);
1967 node
= hashtable_lookup(ust_global
->channels
, (void *) channel_name
,
1968 strlen(channel_name
), &iter
);
1970 ret
= -LTTCOMM_UST_CHAN_NOT_FOUND
;
1974 uchan
= caa_container_of(node
, struct ltt_ust_channel
, node
);
1976 nb_event
+= hashtable_get_count(uchan
->events
);
1978 if (nb_event
== 0) {
1983 DBG3("Listing UST global %d events", nb_event
);
1985 tmp
= zmalloc(nb_event
* sizeof(struct lttng_event
));
1987 ret
= -LTTCOMM_FATAL
;
1991 cds_lfht_for_each_entry(uchan
->events
, &iter
, uevent
, node
) {
1992 strncpy(tmp
[i
].name
, uevent
->attr
.name
, LTTNG_SYMBOL_NAME_LEN
);
1993 tmp
[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
1994 tmp
[i
].enabled
= uevent
->enabled
;
1995 switch (uevent
->attr
.instrumentation
) {
1996 case LTTNG_UST_TRACEPOINT
:
1997 tmp
[i
].type
= LTTNG_EVENT_TRACEPOINT
;
1999 case LTTNG_UST_PROBE
:
2000 tmp
[i
].type
= LTTNG_EVENT_PROBE
;
2002 case LTTNG_UST_FUNCTION
:
2003 tmp
[i
].type
= LTTNG_EVENT_FUNCTION
;
2018 * Fill lttng_event array of all kernel events in the channel.
2020 static int list_lttng_kernel_events(char *channel_name
,
2021 struct ltt_kernel_session
*kernel_session
, struct lttng_event
**events
)
2024 unsigned int nb_event
;
2025 struct ltt_kernel_event
*event
;
2026 struct ltt_kernel_channel
*kchan
;
2028 kchan
= trace_kernel_get_channel_by_name(channel_name
, kernel_session
);
2029 if (kchan
== NULL
) {
2030 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2034 nb_event
= kchan
->event_count
;
2036 DBG("Listing events for channel %s", kchan
->channel
->name
);
2038 if (nb_event
== 0) {
2043 *events
= zmalloc(nb_event
* sizeof(struct lttng_event
));
2044 if (*events
== NULL
) {
2045 ret
= LTTCOMM_FATAL
;
2049 /* Kernel channels */
2050 cds_list_for_each_entry(event
, &kchan
->events_list
.head
, list
) {
2051 strncpy((*events
)[i
].name
, event
->event
->name
, LTTNG_SYMBOL_NAME_LEN
);
2052 (*events
)[i
].name
[LTTNG_SYMBOL_NAME_LEN
- 1] = '\0';
2053 (*events
)[i
].enabled
= event
->enabled
;
2054 switch (event
->event
->instrumentation
) {
2055 case LTTNG_KERNEL_TRACEPOINT
:
2056 (*events
)[i
].type
= LTTNG_EVENT_TRACEPOINT
;
2058 case LTTNG_KERNEL_KPROBE
:
2059 case LTTNG_KERNEL_KRETPROBE
:
2060 (*events
)[i
].type
= LTTNG_EVENT_PROBE
;
2061 memcpy(&(*events
)[i
].attr
.probe
, &event
->event
->u
.kprobe
,
2062 sizeof(struct lttng_kernel_kprobe
));
2064 case LTTNG_KERNEL_FUNCTION
:
2065 (*events
)[i
].type
= LTTNG_EVENT_FUNCTION
;
2066 memcpy(&((*events
)[i
].attr
.ftrace
), &event
->event
->u
.ftrace
,
2067 sizeof(struct lttng_kernel_function
));
2069 case LTTNG_KERNEL_NOOP
:
2070 (*events
)[i
].type
= LTTNG_EVENT_NOOP
;
2072 case LTTNG_KERNEL_SYSCALL
:
2073 (*events
)[i
].type
= LTTNG_EVENT_SYSCALL
;
2075 case LTTNG_KERNEL_ALL
:
2089 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2091 static int cmd_disable_channel(struct ltt_session
*session
,
2092 int domain
, char *channel_name
)
2095 struct ltt_ust_session
*usess
;
2097 usess
= session
->ust_session
;
2100 case LTTNG_DOMAIN_KERNEL
:
2102 ret
= channel_kernel_disable(session
->kernel_session
,
2104 if (ret
!= LTTCOMM_OK
) {
2108 kernel_wait_quiescent(kernel_tracer_fd
);
2111 case LTTNG_DOMAIN_UST
:
2113 struct ltt_ust_channel
*uchan
;
2115 /* Get channel in global UST domain HT */
2116 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2118 if (uchan
== NULL
) {
2119 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2123 ret
= ust_app_disable_channel_all(usess
, uchan
);
2125 ret
= LTTCOMM_UST_DISABLE_FAIL
;
2133 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2134 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2135 case LTTNG_DOMAIN_UST_PID
:
2136 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2139 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2150 * Copy channel from attributes and set it in the application channel list.
2153 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2154 struct lttng_channel *attr, struct ust_app *app)
2157 struct ltt_ust_channel *uchan, *new_chan;
2159 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2160 if (uchan == NULL) {
2161 ret = LTTCOMM_FATAL;
2165 new_chan = trace_ust_create_channel(attr, usess->path);
2166 if (new_chan == NULL) {
2167 PERROR("malloc ltt_ust_channel");
2168 ret = LTTCOMM_FATAL;
2172 ret = channel_ust_copy(new_chan, uchan);
2174 ret = LTTCOMM_FATAL;
2184 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2186 static int cmd_enable_channel(struct ltt_session
*session
,
2187 int domain
, struct lttng_channel
*attr
)
2190 struct ltt_ust_session
*usess
= session
->ust_session
;
2192 DBG("Enabling channel %s for session %s", attr
->name
, session
->name
);
2195 case LTTNG_DOMAIN_KERNEL
:
2197 struct ltt_kernel_channel
*kchan
;
2199 kchan
= trace_kernel_get_channel_by_name(attr
->name
,
2200 session
->kernel_session
);
2201 if (kchan
== NULL
) {
2202 ret
= channel_kernel_create(session
->kernel_session
,
2203 attr
, kernel_poll_pipe
[1]);
2205 ret
= channel_kernel_enable(session
->kernel_session
, kchan
);
2208 if (ret
!= LTTCOMM_OK
) {
2212 kernel_wait_quiescent(kernel_tracer_fd
);
2215 case LTTNG_DOMAIN_UST
:
2217 struct ltt_ust_channel
*uchan
;
2219 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2221 /* Get channel in global UST domain HT */
2222 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2224 if (uchan
== NULL
) {
2225 uchan
= trace_ust_create_channel(attr
, usess
->pathname
);
2226 if (uchan
== NULL
) {
2227 ret
= LTTCOMM_UST_CHAN_FAIL
;
2232 hashtable_add_unique(usess
->domain_global
.channels
, &uchan
->node
);
2234 DBG2("UST channel %s added to global domain HT", attr
->name
);
2236 /* Add channel to all registered applications */
2237 ret
= ust_app_create_channel_all(usess
, uchan
);
2239 ret
= LTTCOMM_UST_CHAN_FAIL
;
2243 /* If already enabled, everything is OK */
2244 if (uchan
->enabled
) {
2249 ret
= ust_app_enable_channel_all(usess
, uchan
);
2251 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2260 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2261 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2262 case LTTNG_DOMAIN_UST_PID
:
2263 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2266 ret
= LTTCOMM_UNKNOWN_DOMAIN
;
2277 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2279 static int cmd_disable_event(struct ltt_session
*session
, int domain
,
2280 char *channel_name
, char *event_name
)
2285 case LTTNG_DOMAIN_KERNEL
:
2287 struct ltt_kernel_channel
*kchan
;
2288 struct ltt_kernel_session
*ksess
;
2290 ksess
= session
->kernel_session
;
2292 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2293 if (kchan
== NULL
) {
2294 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2298 ret
= event_kernel_disable_tracepoint(ksess
, kchan
, event_name
);
2299 if (ret
!= LTTCOMM_OK
) {
2303 kernel_wait_quiescent(kernel_tracer_fd
);
2306 case LTTNG_DOMAIN_UST
:
2308 struct ltt_ust_session
*usess
;
2309 struct ltt_ust_channel
*uchan
;
2311 usess
= session
->ust_session
;
2313 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2315 if (uchan
== NULL
) {
2316 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2320 ret
= ust_app_disable_event(usess
, uchan
, event_name
);
2322 ret
= LTTCOMM_UST_DISABLE_FAIL
;
2326 DBG2("Disable UST event %s in channel %s completed", event_name
,
2331 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2332 case LTTNG_DOMAIN_UST_PID
:
2333 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2335 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2346 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2348 static int cmd_disable_event_all(struct ltt_session
*session
, int domain
,
2354 case LTTNG_DOMAIN_KERNEL
:
2356 struct ltt_kernel_session
*ksess
;
2357 struct ltt_kernel_channel
*kchan
;
2359 ksess
= session
->kernel_session
;
2361 kchan
= trace_kernel_get_channel_by_name(channel_name
, ksess
);
2362 if (kchan
== NULL
) {
2363 ret
= LTTCOMM_KERN_CHAN_NOT_FOUND
;
2367 ret
= event_kernel_disable_all(ksess
, kchan
);
2368 if (ret
!= LTTCOMM_OK
) {
2372 kernel_wait_quiescent(kernel_tracer_fd
);
2375 case LTTNG_DOMAIN_UST
:
2377 struct ltt_ust_session
*usess
;
2378 struct ltt_ust_channel
*uchan
;
2380 usess
= session
->ust_session
;
2382 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2384 if (uchan
== NULL
) {
2385 ret
= LTTCOMM_UST_CHAN_NOT_FOUND
;
2389 ret
= ust_app_disable_event_all(usess
, uchan
);
2391 ret
= LTTCOMM_UST_DISABLE_FAIL
;
2395 DBG2("Disable all UST event in channel %s completed", channel_name
);
2399 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2400 case LTTNG_DOMAIN_UST_PID
:
2401 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2403 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2414 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2416 static int cmd_add_context(struct ltt_session
*session
, int domain
,
2417 char *channel_name
, char *event_name
, struct lttng_event_context
*ctx
)
2422 case LTTNG_DOMAIN_KERNEL
:
2423 /* Add kernel context to kernel tracer */
2424 ret
= context_kernel_add(session
->kernel_session
, ctx
,
2425 event_name
, channel_name
);
2426 if (ret
!= LTTCOMM_OK
) {
2430 case LTTNG_DOMAIN_UST
:
2433 struct ltt_ust_session *usess;
2435 cds_list_for_each_entry(usess, &session->ust_session_list.head, list) {
2436 ret = context_ust_add(usess, ctx,
2437 event_name, channel_name, domain);
2438 if (ret != LTTCOMM_OK) {
2446 /* TODO: UST other domains */
2447 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2458 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2460 static int cmd_enable_event(struct ltt_session
*session
, int domain
,
2461 char *channel_name
, struct lttng_event
*event
)
2464 struct lttng_channel
*attr
;
2465 struct ltt_ust_session
*usess
= session
->ust_session
;
2468 case LTTNG_DOMAIN_KERNEL
:
2470 struct ltt_kernel_channel
*kchan
;
2472 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2473 session
->kernel_session
);
2474 if (kchan
== NULL
) {
2475 attr
= channel_new_default_attr(domain
);
2477 ret
= LTTCOMM_FATAL
;
2480 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2482 /* This call will notify the kernel thread */
2483 ret
= channel_kernel_create(session
->kernel_session
,
2484 attr
, kernel_poll_pipe
[1]);
2485 if (ret
!= LTTCOMM_OK
) {
2492 /* Get the newly created kernel channel pointer */
2493 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2494 session
->kernel_session
);
2495 if (kchan
== NULL
) {
2496 /* This sould not happen... */
2497 ret
= LTTCOMM_FATAL
;
2501 ret
= event_kernel_enable_tracepoint(session
->kernel_session
, kchan
,
2503 if (ret
!= LTTCOMM_OK
) {
2507 kernel_wait_quiescent(kernel_tracer_fd
);
2510 case LTTNG_DOMAIN_UST
:
2512 struct ltt_ust_channel
*uchan
;
2513 struct ltt_ust_event
*uevent
;
2514 struct lttng_channel
*attr
;
2516 uchan
= trace_ust_find_channel_by_name(usess
->domain_global
.channels
,
2518 if (uchan
== NULL
) {
2519 /* Create default channel */
2520 attr
= channel_new_default_attr(domain
);
2522 ret
= LTTCOMM_FATAL
;
2525 snprintf(attr
->name
, NAME_MAX
, "%s", channel_name
);
2527 /* Use the internal command enable channel */
2528 ret
= cmd_enable_channel(session
, domain
, attr
);
2536 /* Get the newly created channel reference back */
2537 uchan
= trace_ust_find_channel_by_name(
2538 usess
->domain_global
.channels
, channel_name
);
2539 if (uchan
== NULL
) {
2540 /* Something is really wrong */
2541 ret
= LTTCOMM_FATAL
;
2546 uevent
= trace_ust_find_event_by_name(uchan
->events
, event
->name
);
2547 if (uevent
== NULL
) {
2548 uevent
= trace_ust_create_event(event
);
2549 if (uevent
== NULL
) {
2550 ret
= LTTCOMM_FATAL
;
2556 ret
= ust_app_create_event_all(usess
, uchan
, uevent
);
2558 ret
= LTTCOMM_UST_ENABLE_FAIL
;
2562 /* Add ltt ust event to channel */
2564 hashtable_add_unique(uchan
->events
, &uevent
->node
);
2567 uevent
->enabled
= 1;
2569 DBG3("UST ltt event %s added to channel %s", uevent
->attr
.name
,
2573 case LTTNG_DOMAIN_UST_EXEC_NAME
:
2574 case LTTNG_DOMAIN_UST_PID
:
2575 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN
:
2577 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2588 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2590 static int cmd_enable_event_all(struct ltt_session
*session
, int domain
,
2591 char *channel_name
, int event_type
)
2594 struct ltt_kernel_channel
*kchan
;
2597 case LTTNG_DOMAIN_KERNEL
:
2598 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2599 session
->kernel_session
);
2600 if (kchan
== NULL
) {
2601 /* This call will notify the kernel thread */
2602 ret
= channel_kernel_create(session
->kernel_session
, NULL
,
2603 kernel_poll_pipe
[1]);
2604 if (ret
!= LTTCOMM_OK
) {
2609 /* Get the newly created kernel channel pointer */
2610 kchan
= trace_kernel_get_channel_by_name(channel_name
,
2611 session
->kernel_session
);
2612 if (kchan
== NULL
) {
2613 /* This sould not happen... */
2614 ret
= LTTCOMM_FATAL
;
2618 switch (event_type
) {
2619 case LTTNG_KERNEL_SYSCALL
:
2620 ret
= event_kernel_enable_all_syscalls(session
->kernel_session
,
2621 kchan
, kernel_tracer_fd
);
2623 case LTTNG_KERNEL_TRACEPOINT
:
2625 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2626 * events already registered to the channel.
2628 ret
= event_kernel_enable_all_tracepoints(session
->kernel_session
,
2629 kchan
, kernel_tracer_fd
);
2631 case LTTNG_KERNEL_ALL
:
2632 /* Enable syscalls and tracepoints */
2633 ret
= event_kernel_enable_all(session
->kernel_session
,
2634 kchan
, kernel_tracer_fd
);
2637 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2640 if (ret
!= LTTCOMM_OK
) {
2644 kernel_wait_quiescent(kernel_tracer_fd
);
2647 /* TODO: Userspace tracing */
2648 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2659 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2661 static ssize_t
cmd_list_tracepoints(int domain
, struct lttng_event
**events
)
2664 ssize_t nb_events
= 0;
2667 case LTTNG_DOMAIN_KERNEL
:
2668 nb_events
= kernel_list_events(kernel_tracer_fd
, events
);
2669 if (nb_events
< 0) {
2670 ret
= LTTCOMM_KERN_LIST_FAIL
;
2674 case LTTNG_DOMAIN_UST
:
2675 nb_events
= ust_app_list_events(events
);
2676 if (nb_events
< 0) {
2677 ret
= LTTCOMM_UST_LIST_FAIL
;
2682 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2689 /* Return negative value to differentiate return code */
2694 * Command LTTNG_START_TRACE processed by the client thread.
2696 static int cmd_start_trace(struct ltt_session
*session
)
2699 struct ltt_kernel_session
*ksession
;
2700 struct ltt_ust_session
*usess
;
2703 ksession
= session
->kernel_session
;
2704 usess
= session
->ust_session
;
2706 if (session
->enabled
)
2707 return LTTCOMM_UST_START_FAIL
;
2708 session
->enabled
= 1;
2710 /* Kernel tracing */
2711 if (ksession
!= NULL
) {
2712 struct ltt_kernel_channel
*kchan
;
2714 /* Open kernel metadata */
2715 if (ksession
->metadata
== NULL
) {
2716 ret
= kernel_open_metadata(ksession
, ksession
->trace_path
);
2718 ret
= LTTCOMM_KERN_META_FAIL
;
2723 /* Open kernel metadata stream */
2724 if (ksession
->metadata_stream_fd
== 0) {
2725 ret
= kernel_open_metadata_stream(ksession
);
2727 ERR("Kernel create metadata stream failed");
2728 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2733 /* For each channel */
2734 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2735 if (kchan
->stream_count
== 0) {
2736 ret
= kernel_open_channel_stream(kchan
);
2738 ret
= LTTCOMM_KERN_STREAM_FAIL
;
2741 /* Update the stream global counter */
2742 ksession
->stream_count_global
+= ret
;
2746 /* Setup kernel consumer socket and send fds to it */
2747 ret
= init_kernel_tracing(ksession
);
2749 ret
= LTTCOMM_KERN_START_FAIL
;
2753 /* This start the kernel tracing */
2754 ret
= kernel_start_session(ksession
);
2756 ret
= LTTCOMM_KERN_START_FAIL
;
2760 /* Quiescent wait after starting trace */
2761 kernel_wait_quiescent(kernel_tracer_fd
);
2764 /* Flag session that trace should start automatically */
2766 usess
->start_trace
= 1;
2768 ret
= ust_app_start_trace_all(usess
);
2770 ret
= LTTCOMM_UST_START_FAIL
;
2782 * Command LTTNG_STOP_TRACE processed by the client thread.
2784 static int cmd_stop_trace(struct ltt_session
*session
)
2787 struct ltt_kernel_channel
*kchan
;
2788 struct ltt_kernel_session
*ksession
;
2789 struct ltt_ust_session
*usess
;
2792 ksession
= session
->kernel_session
;
2793 usess
= session
->ust_session
;
2795 if (!session
->enabled
)
2796 return LTTCOMM_UST_START_FAIL
;
2797 session
->enabled
= 0;
2800 if (ksession
!= NULL
) {
2801 DBG("Stop kernel tracing");
2803 /* Flush all buffers before stopping */
2804 ret
= kernel_metadata_flush_buffer(ksession
->metadata_stream_fd
);
2806 ERR("Kernel metadata flush failed");
2809 cds_list_for_each_entry(kchan
, &ksession
->channel_list
.head
, list
) {
2810 ret
= kernel_flush_buffer(kchan
);
2812 ERR("Kernel flush buffer error");
2816 ret
= kernel_stop_session(ksession
);
2818 ret
= LTTCOMM_KERN_STOP_FAIL
;
2822 kernel_wait_quiescent(kernel_tracer_fd
);
2826 usess
->start_trace
= 0;
2828 ret
= ust_app_stop_trace_all(usess
);
2830 ret
= LTTCOMM_UST_START_FAIL
;
2842 * Command LTTNG_CREATE_SESSION processed by the client thread.
2844 static int cmd_create_session(char *name
, char *path
)
2848 ret
= session_create(name
, path
);
2849 if (ret
!= LTTCOMM_OK
) {
2860 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2862 static int cmd_destroy_session(struct ltt_session
*session
, char *name
)
2866 /* Clean kernel session teardown */
2867 teardown_kernel_session(session
);
2868 /* UST session teardown */
2869 teardown_ust_session(session
);
2872 * Must notify the kernel thread here to update it's poll setin order
2873 * to remove the channel(s)' fd just destroyed.
2875 ret
= notify_thread_pipe(kernel_poll_pipe
[1]);
2877 perror("write kernel poll pipe");
2880 ret
= session_destroy(session
);
2886 * Command LTTNG_CALIBRATE processed by the client thread.
2888 static int cmd_calibrate(int domain
, struct lttng_calibrate
*calibrate
)
2893 case LTTNG_DOMAIN_KERNEL
:
2895 struct lttng_kernel_calibrate kcalibrate
;
2897 kcalibrate
.type
= calibrate
->type
;
2898 ret
= kernel_calibrate(kernel_tracer_fd
, &kcalibrate
);
2900 ret
= LTTCOMM_KERN_ENABLE_FAIL
;
2906 /* TODO: Userspace tracing */
2907 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2918 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2920 static int cmd_register_consumer(struct ltt_session
*session
, int domain
,
2926 case LTTNG_DOMAIN_KERNEL
:
2927 /* Can't register a consumer if there is already one */
2928 if (session
->kernel_session
->consumer_fd
!= 0) {
2929 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
2933 sock
= lttcomm_connect_unix_sock(sock_path
);
2935 ret
= LTTCOMM_CONNECT_FAIL
;
2939 session
->kernel_session
->consumer_fd
= sock
;
2942 /* TODO: Userspace tracing */
2943 ret
= LTTCOMM_NOT_IMPLEMENTED
;
2954 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2956 static ssize_t
cmd_list_domains(struct ltt_session
*session
,
2957 struct lttng_domain
**domains
)
2962 if (session
->kernel_session
!= NULL
) {
2963 DBG3("Listing domains found kernel domain");
2967 if (session
->ust_session
!= NULL
) {
2968 DBG3("Listing domains found UST global domain");
2972 *domains
= zmalloc(nb_dom
* sizeof(struct lttng_domain
));
2973 if (*domains
== NULL
) {
2974 ret
= -LTTCOMM_FATAL
;
2978 if (session
->kernel_session
!= NULL
) {
2979 (*domains
)[index
].type
= LTTNG_DOMAIN_KERNEL
;
2983 if (session
->ust_session
!= NULL
) {
2984 (*domains
)[index
].type
= LTTNG_DOMAIN_UST
;
2995 * Command LTTNG_LIST_CHANNELS processed by the client thread.
2997 static ssize_t
cmd_list_channels(int domain
, struct ltt_session
*session
,
2998 struct lttng_channel
**channels
)
3001 ssize_t nb_chan
= 0;
3004 case LTTNG_DOMAIN_KERNEL
:
3005 if (session
->kernel_session
!= NULL
) {
3006 nb_chan
= session
->kernel_session
->channel_count
;
3008 DBG3("Number of kernel channels %zd", nb_chan
);
3010 case LTTNG_DOMAIN_UST
:
3011 if (session
->ust_session
!= NULL
) {
3012 nb_chan
= hashtable_get_count(
3013 session
->ust_session
->domain_global
.channels
);
3015 DBG3("Number of UST global channels %zd", nb_chan
);
3019 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3024 *channels
= zmalloc(nb_chan
* sizeof(struct lttng_channel
));
3025 if (*channels
== NULL
) {
3026 ret
= -LTTCOMM_FATAL
;
3030 list_lttng_channels(domain
, session
, *channels
);
3042 * Command LTTNG_LIST_EVENTS processed by the client thread.
3044 static ssize_t
cmd_list_events(int domain
, struct ltt_session
*session
,
3045 char *channel_name
, struct lttng_event
**events
)
3048 ssize_t nb_event
= 0;
3051 case LTTNG_DOMAIN_KERNEL
:
3052 if (session
->kernel_session
!= NULL
) {
3053 nb_event
= list_lttng_kernel_events(channel_name
,
3054 session
->kernel_session
, events
);
3057 case LTTNG_DOMAIN_UST
:
3059 if (session
->ust_session
!= NULL
) {
3060 nb_event
= list_lttng_ust_global_events(channel_name
,
3061 &session
->ust_session
->domain_global
, events
);
3066 ret
= -LTTCOMM_NOT_IMPLEMENTED
;
3077 * Process the command requested by the lttng client within the command
3078 * context structure. This function make sure that the return structure (llm)
3079 * is set and ready for transmission before returning.
3081 * Return any error encountered or 0 for success.
3083 static int process_client_msg(struct command_ctx
*cmd_ctx
)
3085 int ret
= LTTCOMM_OK
;
3086 int need_tracing_session
= 1;
3088 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
3091 * Check for command that don't needs to allocate a returned payload. We do
3092 * this here so we don't have to make the call for no payload at each
3095 switch(cmd_ctx
->lsm
->cmd_type
) {
3096 case LTTNG_LIST_SESSIONS
:
3097 case LTTNG_LIST_TRACEPOINTS
:
3098 case LTTNG_LIST_DOMAINS
:
3099 case LTTNG_LIST_CHANNELS
:
3100 case LTTNG_LIST_EVENTS
:
3103 /* Setup lttng message with no payload */
3104 ret
= setup_lttng_msg(cmd_ctx
, 0);
3106 /* This label does not try to unlock the session */
3107 goto init_setup_error
;
3111 /* Commands that DO NOT need a session. */
3112 switch (cmd_ctx
->lsm
->cmd_type
) {
3113 case LTTNG_CALIBRATE
:
3114 case LTTNG_CREATE_SESSION
:
3115 case LTTNG_LIST_SESSIONS
:
3116 case LTTNG_LIST_TRACEPOINTS
:
3117 need_tracing_session
= 0;
3120 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
3121 session_lock_list();
3122 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
3123 session_unlock_list();
3124 if (cmd_ctx
->session
== NULL
) {
3125 if (cmd_ctx
->lsm
->session
.name
!= NULL
) {
3126 ret
= LTTCOMM_SESS_NOT_FOUND
;
3128 /* If no session name specified */
3129 ret
= LTTCOMM_SELECT_SESS
;
3133 /* Acquire lock for the session */
3134 session_lock(cmd_ctx
->session
);
3140 * Check domain type for specific "pre-action".
3142 switch (cmd_ctx
->lsm
->domain
.type
) {
3143 case LTTNG_DOMAIN_KERNEL
:
3144 /* Kernel tracer check */
3145 if (kernel_tracer_fd
== 0) {
3146 /* Basically, load kernel tracer modules */
3147 init_kernel_tracer();
3148 if (kernel_tracer_fd
== 0) {
3149 ret
= LTTCOMM_KERN_NA
;
3154 /* Need a session for kernel command */
3155 if (need_tracing_session
) {
3156 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3157 ret
= create_kernel_session(cmd_ctx
->session
);
3159 ret
= LTTCOMM_KERN_SESS_FAIL
;
3164 /* Start the kernel consumer daemon */
3165 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3166 if (kconsumer_data
.pid
== 0 &&
3167 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3168 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3169 ret
= start_consumerd(&kconsumer_data
);
3171 ret
= LTTCOMM_KERN_CONSUMER_FAIL
;
3175 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3179 case LTTNG_DOMAIN_UST
:
3181 if (need_tracing_session
) {
3182 if (cmd_ctx
->session
->ust_session
== NULL
) {
3183 ret
= create_ust_session(cmd_ctx
->session
,
3184 &cmd_ctx
->lsm
->domain
);
3185 if (ret
!= LTTCOMM_OK
) {
3189 /* Start the UST consumer daemons */
3191 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3192 if (consumerd64_path
[0] != '\0' &&
3193 ustconsumer64_data
.pid
== 0 &&
3194 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3195 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3196 ret
= start_consumerd(&ustconsumer64_data
);
3198 ret
= LTTCOMM_UST_CONSUMER64_FAIL
;
3199 ust_consumerd64_fd
= -EINVAL
;
3203 ust_consumerd64_fd
= ustconsumer64_data
.cmd_sock
;
3205 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3208 if (consumerd32_path
[0] != '\0' &&
3209 ustconsumer32_data
.pid
== 0 &&
3210 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3211 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3212 ret
= start_consumerd(&ustconsumer32_data
);
3214 ret
= LTTCOMM_UST_CONSUMER32_FAIL
;
3215 ust_consumerd32_fd
= -EINVAL
;
3218 ust_consumerd32_fd
= ustconsumer32_data
.cmd_sock
;
3220 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3229 /* Process by command type */
3230 switch (cmd_ctx
->lsm
->cmd_type
) {
3231 case LTTNG_ADD_CONTEXT
:
3233 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3234 cmd_ctx
->lsm
->u
.context
.channel_name
,
3235 cmd_ctx
->lsm
->u
.context
.event_name
,
3236 &cmd_ctx
->lsm
->u
.context
.ctx
);
3239 case LTTNG_DISABLE_CHANNEL
:
3241 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3242 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3245 case LTTNG_DISABLE_EVENT
:
3247 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3248 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3249 cmd_ctx
->lsm
->u
.disable
.name
);
3253 case LTTNG_DISABLE_ALL_EVENT
:
3255 DBG("Disabling all events");
3257 ret
= cmd_disable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3258 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3261 case LTTNG_ENABLE_CHANNEL
:
3263 ret
= cmd_enable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3264 &cmd_ctx
->lsm
->u
.channel
.chan
);
3267 case LTTNG_ENABLE_EVENT
:
3269 ret
= cmd_enable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3270 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3271 &cmd_ctx
->lsm
->u
.enable
.event
);
3274 case LTTNG_ENABLE_ALL_EVENT
:
3276 DBG("Enabling all events");
3278 ret
= cmd_enable_event_all(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3279 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3280 cmd_ctx
->lsm
->u
.enable
.event
.type
);
3283 case LTTNG_LIST_TRACEPOINTS
:
3285 struct lttng_event
*events
;
3288 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3289 if (nb_events
< 0) {
3295 * Setup lttng message with payload size set to the event list size in
3296 * bytes and then copy list into the llm payload.
3298 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3304 /* Copy event list into message payload */
3305 memcpy(cmd_ctx
->llm
->payload
, events
,
3306 sizeof(struct lttng_event
) * nb_events
);
3313 case LTTNG_START_TRACE
:
3315 ret
= cmd_start_trace(cmd_ctx
->session
);
3318 case LTTNG_STOP_TRACE
:
3320 ret
= cmd_stop_trace(cmd_ctx
->session
);
3323 case LTTNG_CREATE_SESSION
:
3325 ret
= cmd_create_session(cmd_ctx
->lsm
->session
.name
,
3326 cmd_ctx
->lsm
->session
.path
);
3329 case LTTNG_DESTROY_SESSION
:
3331 ret
= cmd_destroy_session(cmd_ctx
->session
,
3332 cmd_ctx
->lsm
->session
.name
);
3335 case LTTNG_LIST_DOMAINS
:
3338 struct lttng_domain
*domains
;
3340 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3346 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3351 /* Copy event list into message payload */
3352 memcpy(cmd_ctx
->llm
->payload
, domains
,
3353 nb_dom
* sizeof(struct lttng_domain
));
3360 case LTTNG_LIST_CHANNELS
:
3363 struct lttng_channel
*channels
;
3365 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3366 cmd_ctx
->session
, &channels
);
3372 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3377 /* Copy event list into message payload */
3378 memcpy(cmd_ctx
->llm
->payload
, channels
,
3379 nb_chan
* sizeof(struct lttng_channel
));
3386 case LTTNG_LIST_EVENTS
:
3389 struct lttng_event
*events
= NULL
;
3391 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3392 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3398 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3403 /* Copy event list into message payload */
3404 memcpy(cmd_ctx
->llm
->payload
, events
,
3405 nb_event
* sizeof(struct lttng_event
));
3412 case LTTNG_LIST_SESSIONS
:
3414 session_lock_list();
3416 if (session_list_ptr
->count
== 0) {
3417 ret
= LTTCOMM_NO_SESSION
;
3418 session_unlock_list();
3422 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) *
3423 session_list_ptr
->count
);
3425 session_unlock_list();
3429 /* Filled the session array */
3430 list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
));
3432 session_unlock_list();
3437 case LTTNG_CALIBRATE
:
3439 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3440 &cmd_ctx
->lsm
->u
.calibrate
);
3443 case LTTNG_REGISTER_CONSUMER
:
3445 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3446 cmd_ctx
->lsm
->u
.reg
.path
);
3455 if (cmd_ctx
->llm
== NULL
) {
3456 DBG("Missing llm structure. Allocating one.");
3457 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3461 /* Set return code */
3462 cmd_ctx
->llm
->ret_code
= ret
;
3464 if (cmd_ctx
->session
) {
3465 session_unlock(cmd_ctx
->session
);
3472 * This thread manage all clients request using the unix client socket for
3475 static void *thread_manage_clients(void *data
)
3477 int sock
= 0, ret
, i
, pollfd
;
3478 uint32_t revents
, nb_fd
;
3479 struct command_ctx
*cmd_ctx
= NULL
;
3480 struct lttng_poll_event events
;
3482 DBG("[thread] Manage client started");
3484 rcu_register_thread();
3486 ret
= lttcomm_listen_unix_sock(client_sock
);
3492 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3493 * more will be added to this poll set.
3495 ret
= create_thread_poll_set(&events
, 2);
3500 /* Add the application registration socket */
3501 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
3507 * Notify parent pid that we are ready to accept command for client side.
3509 if (opt_sig_parent
) {
3510 kill(ppid
, SIGCHLD
);
3514 DBG("Accepting client command ...");
3516 nb_fd
= LTTNG_POLL_GETNB(&events
);
3518 /* Inifinite blocking call, waiting for transmission */
3519 ret
= lttng_poll_wait(&events
, -1);
3524 for (i
= 0; i
< nb_fd
; i
++) {
3525 /* Fetch once the poll data */
3526 revents
= LTTNG_POLL_GETEV(&events
, i
);
3527 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3529 /* Thread quit pipe has been closed. Killing thread. */
3530 ret
= check_thread_quit_pipe(pollfd
, revents
);
3535 /* Event on the registration socket */
3536 if (pollfd
== client_sock
) {
3537 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3538 ERR("Client socket poll error");
3544 DBG("Wait for client response");
3546 sock
= lttcomm_accept_unix_sock(client_sock
);
3551 /* Allocate context command to process the client request */
3552 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
3553 if (cmd_ctx
== NULL
) {
3554 perror("zmalloc cmd_ctx");
3558 /* Allocate data buffer for reception */
3559 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
3560 if (cmd_ctx
->lsm
== NULL
) {
3561 perror("zmalloc cmd_ctx->lsm");
3565 cmd_ctx
->llm
= NULL
;
3566 cmd_ctx
->session
= NULL
;
3569 * Data is received from the lttng client. The struct
3570 * lttcomm_session_msg (lsm) contains the command and data request of
3573 DBG("Receiving data from client ...");
3574 ret
= lttcomm_recv_unix_sock(sock
, cmd_ctx
->lsm
,
3575 sizeof(struct lttcomm_session_msg
));
3577 DBG("Nothing recv() from client... continuing");
3583 // TODO: Validate cmd_ctx including sanity check for
3584 // security purpose.
3586 rcu_thread_online();
3588 * This function dispatch the work to the kernel or userspace tracer
3589 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3590 * informations for the client. The command context struct contains
3591 * everything this function may needs.
3593 ret
= process_client_msg(cmd_ctx
);
3594 rcu_thread_offline();
3597 * TODO: Inform client somehow of the fatal error. At
3598 * this point, ret < 0 means that a zmalloc failed
3599 * (ENOMEM). Error detected but still accept command.
3601 clean_command_ctx(&cmd_ctx
);
3605 DBG("Sending response (size: %d, retcode: %s)",
3606 cmd_ctx
->lttng_msg_size
,
3607 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
3608 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
3610 ERR("Failed to send data back to client");
3613 clean_command_ctx(&cmd_ctx
);
3615 /* End of transmission */
3620 DBG("Client thread dying");
3621 unlink(client_unix_sock_path
);
3625 lttng_poll_clean(&events
);
3626 clean_command_ctx(&cmd_ctx
);
3628 rcu_unregister_thread();
3634 * usage function on stderr
3636 static void usage(void)
3638 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
3639 fprintf(stderr
, " -h, --help Display this usage.\n");
3640 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
3641 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3642 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3643 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3644 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3645 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3646 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3647 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3648 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3649 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3650 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3651 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3652 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
3653 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3654 fprintf(stderr
, " -V, --version Show version number.\n");
3655 fprintf(stderr
, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3656 fprintf(stderr
, " -q, --quiet No output at all.\n");
3657 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3658 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3662 * daemon argument parsing
3664 static int parse_args(int argc
, char **argv
)
3668 static struct option long_options
[] = {
3669 { "client-sock", 1, 0, 'c' },
3670 { "apps-sock", 1, 0, 'a' },
3671 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3672 { "kconsumerd-err-sock", 1, 0, 'E' },
3673 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3674 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3675 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3676 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3677 { "consumerd32-path", 1, 0, 'u' },
3678 { "consumerd32-libdir", 1, 0, 'U' },
3679 { "consumerd64-path", 1, 0, 't' },
3680 { "consumerd64-libdir", 1, 0, 'T' },
3681 { "daemonize", 0, 0, 'd' },
3682 { "sig-parent", 0, 0, 'S' },
3683 { "help", 0, 0, 'h' },
3684 { "group", 1, 0, 'g' },
3685 { "version", 0, 0, 'V' },
3686 { "quiet", 0, 0, 'q' },
3687 { "verbose", 0, 0, 'v' },
3688 { "verbose-consumer", 0, 0, 'Z' },
3693 int option_index
= 0;
3694 c
= getopt_long(argc
, argv
, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3695 long_options
, &option_index
);
3702 fprintf(stderr
, "option %s", long_options
[option_index
].name
);
3704 fprintf(stderr
, " with arg %s\n", optarg
);
3708 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3711 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3717 opt_tracing_group
= optarg
;
3723 fprintf(stdout
, "%s\n", VERSION
);
3729 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3732 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3735 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3738 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3741 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3744 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", optarg
);
3750 /* Verbose level can increase using multiple -v */
3754 opt_verbose_consumer
+= 1;
3757 consumerd32_path
= optarg
;
3760 consumerd32_libdir
= optarg
;
3763 consumerd64_path
= optarg
;
3766 consumerd64_libdir
= optarg
;
3769 /* Unknown option or other error.
3770 * Error is printed by getopt, just return */
3779 * Creates the two needed socket by the daemon.
3780 * apps_sock - The communication socket for all UST apps.
3781 * client_sock - The communication of the cli tool (lttng).
3783 static int init_daemon_socket(void)
3788 old_umask
= umask(0);
3790 /* Create client tool unix socket */
3791 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
3792 if (client_sock
< 0) {
3793 ERR("Create unix sock failed: %s", client_unix_sock_path
);
3798 /* File permission MUST be 660 */
3799 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3801 ERR("Set file permissions failed: %s", client_unix_sock_path
);
3806 /* Create the application unix socket */
3807 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
3808 if (apps_sock
< 0) {
3809 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
3814 /* File permission MUST be 666 */
3815 ret
= chmod(apps_unix_sock_path
,
3816 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
3818 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
3829 * Check if the global socket is available, and if a daemon is answering at the
3830 * other side. If yes, error is returned.
3832 static int check_existing_daemon(void)
3834 if (access(client_unix_sock_path
, F_OK
) < 0 &&
3835 access(apps_unix_sock_path
, F_OK
) < 0) {
3839 /* Is there anybody out there ? */
3840 if (lttng_session_daemon_alive()) {
3848 * Set the tracing group gid onto the client socket.
3850 * Race window between mkdir and chown is OK because we are going from more
3851 * permissive (root.root) to les permissive (root.tracing).
3853 static int set_permissions(void)
3858 gid
= allowed_group();
3861 WARN("No tracing group detected");
3864 ERR("Missing tracing group. Aborting execution.");
3870 /* Set lttng run dir */
3871 ret
= chown(LTTNG_RUNDIR
, 0, gid
);
3873 ERR("Unable to set group on " LTTNG_RUNDIR
);
3877 /* lttng client socket path */
3878 ret
= chown(client_unix_sock_path
, 0, gid
);
3880 ERR("Unable to set group on %s", client_unix_sock_path
);
3884 /* kconsumer error socket path */
3885 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, gid
);
3887 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
3891 /* 64-bit ustconsumer error socket path */
3892 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, gid
);
3894 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
3898 /* 32-bit ustconsumer compat32 error socket path */
3899 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, gid
);
3901 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
3905 DBG("All permissions are set");
3912 * Create the pipe used to wake up the kernel thread.
3914 static int create_kernel_poll_pipe(void)
3916 return pipe2(kernel_poll_pipe
, O_CLOEXEC
);
3920 * Create the application command pipe to wake thread_manage_apps.
3922 static int create_apps_cmd_pipe(void)
3924 return pipe2(apps_cmd_pipe
, O_CLOEXEC
);
3928 * Create the lttng run directory needed for all global sockets and pipe.
3930 static int create_lttng_rundir(void)
3934 ret
= mkdir(LTTNG_RUNDIR
, S_IRWXU
| S_IRWXG
);
3936 if (errno
!= EEXIST
) {
3937 ERR("Unable to create " LTTNG_RUNDIR
);
3949 * Setup sockets and directory needed by the kconsumerd communication with the
3952 static int set_consumer_sockets(struct consumer_data
*consumer_data
)
3957 switch (consumer_data
->type
) {
3958 case LTTNG_CONSUMER_KERNEL
:
3959 path
= KCONSUMERD_PATH
;
3961 case LTTNG_CONSUMER64_UST
:
3962 path
= USTCONSUMERD64_PATH
;
3964 case LTTNG_CONSUMER32_UST
:
3965 path
= USTCONSUMERD32_PATH
;
3968 ERR("Consumer type unknown");
3973 ret
= mkdir(path
, S_IRWXU
| S_IRWXG
);
3975 if (errno
!= EEXIST
) {
3976 ERR("Failed to create %s", path
);
3982 /* Create the kconsumerd error unix socket */
3983 consumer_data
->err_sock
=
3984 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
3985 if (consumer_data
->err_sock
< 0) {
3986 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
3991 /* File permission MUST be 660 */
3992 ret
= chmod(consumer_data
->err_unix_sock_path
,
3993 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3995 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4005 * Signal handler for the daemon
4007 * Simply stop all worker threads, leaving main() return gracefully after
4008 * joining all threads and calling cleanup().
4010 static void sighandler(int sig
)
4014 DBG("SIGPIPE catched");
4017 DBG("SIGINT catched");
4021 DBG("SIGTERM catched");
4030 * Setup signal handler for :
4031 * SIGINT, SIGTERM, SIGPIPE
4033 static int set_signal_handler(void)
4036 struct sigaction sa
;
4039 if ((ret
= sigemptyset(&sigset
)) < 0) {
4040 perror("sigemptyset");
4044 sa
.sa_handler
= sighandler
;
4045 sa
.sa_mask
= sigset
;
4047 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4048 perror("sigaction");
4052 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4053 perror("sigaction");
4057 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4058 perror("sigaction");
4062 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4068 * Set open files limit to unlimited. This daemon can open a large number of
4069 * file descriptors in order to consumer multiple kernel traces.
4071 static void set_ulimit(void)
4076 /* The kernel does not allowed an infinite limit for open files */
4077 lim
.rlim_cur
= 65535;
4078 lim
.rlim_max
= 65535;
4080 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
4082 perror("failed to set open files limit");
4089 int main(int argc
, char **argv
)
4093 const char *home_path
;
4095 rcu_register_thread();
4097 /* Create thread quit pipe */
4098 if ((ret
= init_thread_quit_pipe()) < 0) {
4102 setup_consumerd_path();
4104 /* Parse arguments */
4106 if ((ret
= parse_args(argc
, argv
) < 0)) {
4119 /* Check if daemon is UID = 0 */
4120 is_root
= !getuid();
4123 ret
= create_lttng_rundir();
4128 if (strlen(apps_unix_sock_path
) == 0) {
4129 snprintf(apps_unix_sock_path
, PATH_MAX
,
4130 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
4133 if (strlen(client_unix_sock_path
) == 0) {
4134 snprintf(client_unix_sock_path
, PATH_MAX
,
4135 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
4138 /* Set global SHM for ust */
4139 if (strlen(wait_shm_path
) == 0) {
4140 snprintf(wait_shm_path
, PATH_MAX
,
4141 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
4144 home_path
= get_home_dir();
4145 if (home_path
== NULL
) {
4146 /* TODO: Add --socket PATH option */
4147 ERR("Can't get HOME directory for sockets creation.");
4152 if (strlen(apps_unix_sock_path
) == 0) {
4153 snprintf(apps_unix_sock_path
, PATH_MAX
,
4154 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
4157 /* Set the cli tool unix socket path */
4158 if (strlen(client_unix_sock_path
) == 0) {
4159 snprintf(client_unix_sock_path
, PATH_MAX
,
4160 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
4163 /* Set global SHM for ust */
4164 if (strlen(wait_shm_path
) == 0) {
4165 snprintf(wait_shm_path
, PATH_MAX
,
4166 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, geteuid());
4170 DBG("Client socket path %s", client_unix_sock_path
);
4171 DBG("Application socket path %s", apps_unix_sock_path
);
4174 * See if daemon already exist.
4176 if ((ret
= check_existing_daemon()) < 0) {
4177 ERR("Already running daemon.\n");
4179 * We do not goto exit because we must not cleanup()
4180 * because a daemon is already running.
4185 /* After this point, we can safely call cleanup() with "goto exit" */
4188 * These actions must be executed as root. We do that *after* setting up
4189 * the sockets path because we MUST make the check for another daemon using
4190 * those paths *before* trying to set the kernel consumer sockets and init
4194 ret
= set_consumer_sockets(&kconsumer_data
);
4199 ret
= set_consumer_sockets(&ustconsumer64_data
);
4204 ret
= set_consumer_sockets(&ustconsumer32_data
);
4209 /* Setup kernel tracer */
4210 init_kernel_tracer();
4212 /* Set ulimit for open files */
4216 if ((ret
= set_signal_handler()) < 0) {
4220 /* Setup the needed unix socket */
4221 if ((ret
= init_daemon_socket()) < 0) {
4225 /* Set credentials to socket */
4226 if (is_root
&& ((ret
= set_permissions()) < 0)) {
4230 /* Get parent pid if -S, --sig-parent is specified. */
4231 if (opt_sig_parent
) {
4235 /* Setup the kernel pipe for waking up the kernel thread */
4236 if ((ret
= create_kernel_poll_pipe()) < 0) {
4240 /* Setup the thread apps communication pipe. */
4241 if ((ret
= create_apps_cmd_pipe()) < 0) {
4245 /* Init UST command queue. */
4246 cds_wfq_init(&ust_cmd_queue
.queue
);
4248 /* Init UST app hash table */
4252 * Get session list pointer. This pointer MUST NOT be free(). This list is
4253 * statically declared in session.c
4255 session_list_ptr
= session_get_list();
4257 /* Set up max poll set size */
4258 lttng_poll_set_max_size();
4260 /* Create thread to manage the client socket */
4261 ret
= pthread_create(&client_thread
, NULL
,
4262 thread_manage_clients
, (void *) NULL
);
4264 perror("pthread_create clients");
4268 /* Create thread to dispatch registration */
4269 ret
= pthread_create(&dispatch_thread
, NULL
,
4270 thread_dispatch_ust_registration
, (void *) NULL
);
4272 perror("pthread_create dispatch");
4276 /* Create thread to manage application registration. */
4277 ret
= pthread_create(®_apps_thread
, NULL
,
4278 thread_registration_apps
, (void *) NULL
);
4280 perror("pthread_create registration");
4284 /* Create thread to manage application socket */
4285 ret
= pthread_create(&apps_thread
, NULL
,
4286 thread_manage_apps
, (void *) NULL
);
4288 perror("pthread_create apps");
4292 /* Create kernel thread to manage kernel event */
4293 ret
= pthread_create(&kernel_thread
, NULL
,
4294 thread_manage_kernel
, (void *) NULL
);
4296 perror("pthread_create kernel");
4300 ret
= pthread_join(kernel_thread
, &status
);
4302 perror("pthread_join");
4303 goto error
; /* join error, exit without cleanup */
4307 ret
= pthread_join(apps_thread
, &status
);
4309 perror("pthread_join");
4310 goto error
; /* join error, exit without cleanup */
4314 ret
= pthread_join(reg_apps_thread
, &status
);
4316 perror("pthread_join");
4317 goto error
; /* join error, exit without cleanup */
4321 ret
= pthread_join(dispatch_thread
, &status
);
4323 perror("pthread_join");
4324 goto error
; /* join error, exit without cleanup */
4328 ret
= pthread_join(client_thread
, &status
);
4330 perror("pthread_join");
4331 goto error
; /* join error, exit without cleanup */
4334 ret
= join_consumer_thread(&kconsumer_data
);
4336 perror("join_consumer");
4337 goto error
; /* join error, exit without cleanup */
4343 * cleanup() is called when no other thread is running.
4345 rcu_thread_online();
4347 rcu_thread_offline();
4348 rcu_unregister_thread();