2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
36 #include <sys/types.h>
38 #include <urcu/uatomic.h>
42 #include <common/common.h>
43 #include <common/compat/socket.h>
44 #include <common/defaults.h>
45 #include <common/kernel-consumer/kernel-consumer.h>
46 #include <common/futex.h>
47 #include <common/relayd/relayd.h>
48 #include <common/utils.h>
49 #include <common/daemonize.h>
50 #include <common/config/config.h>
52 #include "lttng-sessiond.h"
53 #include "buffer-registry.h"
60 #include "kernel-consumer.h"
64 #include "ust-consumer.h"
67 #include "health-sessiond.h"
68 #include "testpoint.h"
69 #include "ust-thread.h"
70 #include "agent-thread.h"
72 #include "load-session-thread.h"
75 #define CONSUMERD_FILE "lttng-consumerd"
78 static const char *tracing_group_name
= DEFAULT_TRACING_GROUP
;
79 static int tracing_group_name_override
;
80 static char *opt_pidfile
;
81 static int opt_sig_parent
;
82 static int opt_verbose_consumer
;
83 static int opt_daemon
, opt_background
;
84 static int opt_no_kernel
;
85 static char *opt_load_session_path
;
86 static pid_t ppid
; /* Parent PID for --sig-parent option */
87 static pid_t child_ppid
; /* Internal parent PID use with daemonize. */
89 static int lockfile_fd
= -1;
91 /* Set to 1 when a SIGUSR1 signal is received. */
92 static int recv_child_signal
;
95 * Consumer daemon specific control data. Every value not initialized here is
96 * set to 0 by the static definition.
98 static struct consumer_data kconsumer_data
= {
99 .type
= LTTNG_CONSUMER_KERNEL
,
100 .err_unix_sock_path
= DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
101 .cmd_unix_sock_path
= DEFAULT_KCONSUMERD_CMD_SOCK_PATH
,
104 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
105 .lock
= PTHREAD_MUTEX_INITIALIZER
,
106 .cond
= PTHREAD_COND_INITIALIZER
,
107 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
109 static struct consumer_data ustconsumer64_data
= {
110 .type
= LTTNG_CONSUMER64_UST
,
111 .err_unix_sock_path
= DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
112 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
,
115 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
116 .lock
= PTHREAD_MUTEX_INITIALIZER
,
117 .cond
= PTHREAD_COND_INITIALIZER
,
118 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
120 static struct consumer_data ustconsumer32_data
= {
121 .type
= LTTNG_CONSUMER32_UST
,
122 .err_unix_sock_path
= DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
123 .cmd_unix_sock_path
= DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
,
126 .pid_mutex
= PTHREAD_MUTEX_INITIALIZER
,
127 .lock
= PTHREAD_MUTEX_INITIALIZER
,
128 .cond
= PTHREAD_COND_INITIALIZER
,
129 .cond_mutex
= PTHREAD_MUTEX_INITIALIZER
,
132 /* Command line options */
133 static const struct option long_options
[] = {
134 { "client-sock", 1, 0, 'c' },
135 { "apps-sock", 1, 0, 'a' },
136 { "kconsumerd-cmd-sock", 1, 0, 'C' },
137 { "kconsumerd-err-sock", 1, 0, 'E' },
138 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
139 { "ustconsumerd32-err-sock", 1, 0, 'H' },
140 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
141 { "ustconsumerd64-err-sock", 1, 0, 'F' },
142 { "consumerd32-path", 1, 0, 'u' },
143 { "consumerd32-libdir", 1, 0, 'U' },
144 { "consumerd64-path", 1, 0, 't' },
145 { "consumerd64-libdir", 1, 0, 'T' },
146 { "daemonize", 0, 0, 'd' },
147 { "background", 0, 0, 'b' },
148 { "sig-parent", 0, 0, 'S' },
149 { "help", 0, 0, 'h' },
150 { "group", 1, 0, 'g' },
151 { "version", 0, 0, 'V' },
152 { "quiet", 0, 0, 'q' },
153 { "verbose", 0, 0, 'v' },
154 { "verbose-consumer", 0, 0, 'Z' },
155 { "no-kernel", 0, 0, 'N' },
156 { "pidfile", 1, 0, 'p' },
157 { "agent-tcp-port", 1, 0, 'J' },
158 { "config", 1, 0, 'f' },
159 { "load", 1, 0, 'l' },
160 { "kmod-probes", 1, 0, 'P' },
161 { "extra-kmod-probes", 1, 0, 'e' },
165 /* Command line options to ignore from configuration file */
166 static const char *config_ignore_options
[] = { "help", "version", "config" };
168 /* Shared between threads */
169 static int dispatch_thread_exit
;
171 /* Global application Unix socket path */
172 static char apps_unix_sock_path
[PATH_MAX
];
173 /* Global client Unix socket path */
174 static char client_unix_sock_path
[PATH_MAX
];
175 /* global wait shm path for UST */
176 static char wait_shm_path
[PATH_MAX
];
177 /* Global health check unix path */
178 static char health_unix_sock_path
[PATH_MAX
];
180 /* Sockets and FDs */
181 static int client_sock
= -1;
182 static int apps_sock
= -1;
183 int kernel_tracer_fd
= -1;
184 static int kernel_poll_pipe
[2] = { -1, -1 };
187 * Quit pipe for all threads. This permits a single cancellation point
188 * for all threads when receiving an event on the pipe.
190 static int thread_quit_pipe
[2] = { -1, -1 };
193 * This pipe is used to inform the thread managing application communication
194 * that a command is queued and ready to be processed.
196 static int apps_cmd_pipe
[2] = { -1, -1 };
198 int apps_cmd_notify_pipe
[2] = { -1, -1 };
200 /* Pthread, Mutexes and Semaphores */
201 static pthread_t apps_thread
;
202 static pthread_t apps_notify_thread
;
203 static pthread_t reg_apps_thread
;
204 static pthread_t client_thread
;
205 static pthread_t kernel_thread
;
206 static pthread_t dispatch_thread
;
207 static pthread_t health_thread
;
208 static pthread_t ht_cleanup_thread
;
209 static pthread_t agent_reg_thread
;
210 static pthread_t load_session_thread
;
213 * UST registration command queue. This queue is tied with a futex and uses a N
214 * wakers / 1 waiter implemented and detailed in futex.c/.h
216 * The thread_registration_apps and thread_dispatch_ust_registration uses this
217 * queue along with the wait/wake scheme. The thread_manage_apps receives down
218 * the line new application socket and monitors it for any I/O error or clean
219 * close that triggers an unregistration of the application.
221 static struct ust_cmd_queue ust_cmd_queue
;
224 * Pointer initialized before thread creation.
226 * This points to the tracing session list containing the session count and a
227 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
228 * MUST NOT be taken if you call a public function in session.c.
230 * The lock is nested inside the structure: session_list_ptr->lock. Please use
231 * session_lock_list and session_unlock_list for lock acquisition.
233 static struct ltt_session_list
*session_list_ptr
;
235 int ust_consumerd64_fd
= -1;
236 int ust_consumerd32_fd
= -1;
238 static const char *consumerd32_bin
= CONFIG_CONSUMERD32_BIN
;
239 static const char *consumerd64_bin
= CONFIG_CONSUMERD64_BIN
;
240 static const char *consumerd32_libdir
= CONFIG_CONSUMERD32_LIBDIR
;
241 static const char *consumerd64_libdir
= CONFIG_CONSUMERD64_LIBDIR
;
242 static int consumerd32_bin_override
;
243 static int consumerd64_bin_override
;
244 static int consumerd32_libdir_override
;
245 static int consumerd64_libdir_override
;
247 static const char *module_proc_lttng
= "/proc/lttng";
250 * Consumer daemon state which is changed when spawning it, killing it or in
251 * case of a fatal error.
253 enum consumerd_state
{
254 CONSUMER_STARTED
= 1,
255 CONSUMER_STOPPED
= 2,
260 * This consumer daemon state is used to validate if a client command will be
261 * able to reach the consumer. If not, the client is informed. For instance,
262 * doing a "lttng start" when the consumer state is set to ERROR will return an
263 * error to the client.
265 * The following example shows a possible race condition of this scheme:
267 * consumer thread error happens
269 * client cmd checks state -> still OK
270 * consumer thread exit, sets error
271 * client cmd try to talk to consumer
274 * However, since the consumer is a different daemon, we have no way of making
275 * sure the command will reach it safely even with this state flag. This is why
276 * we consider that up to the state validation during command processing, the
277 * command is safe. After that, we can not guarantee the correctness of the
278 * client request vis-a-vis the consumer.
280 static enum consumerd_state ust_consumerd_state
;
281 static enum consumerd_state kernel_consumerd_state
;
284 * Socket timeout for receiving and sending in seconds.
286 static int app_socket_timeout
;
288 /* Set in main() with the current page size. */
291 /* Application health monitoring */
292 struct health_app
*health_sessiond
;
294 /* Agent TCP port for registration. Used by the agent thread. */
295 unsigned int agent_tcp_port
= DEFAULT_AGENT_TCP_PORT
;
297 /* Am I root or not. */
298 int is_root
; /* Set to 1 if the daemon is running as root */
300 const char * const config_section_name
= "sessiond";
302 /* Load session thread information to operate. */
303 struct load_session_thread_data
*load_info
;
306 * Whether sessiond is ready for commands/health check requests.
307 * NR_LTTNG_SESSIOND_READY must match the number of calls to
308 * sessiond_notify_ready().
310 #define NR_LTTNG_SESSIOND_READY 3
311 int lttng_sessiond_ready
= NR_LTTNG_SESSIOND_READY
;
313 /* Notify parents that we are ready for cmd and health check */
315 void sessiond_notify_ready(void)
317 if (uatomic_sub_return(<tng_sessiond_ready
, 1) == 0) {
319 * Notify parent pid that we are ready to accept command
320 * for client side. This ppid is the one from the
321 * external process that spawned us.
323 if (opt_sig_parent
) {
328 * Notify the parent of the fork() process that we are
331 if (opt_daemon
|| opt_background
) {
332 kill(child_ppid
, SIGUSR1
);
338 void setup_consumerd_path(void)
340 const char *bin
, *libdir
;
343 * Allow INSTALL_BIN_PATH to be used as a target path for the
344 * native architecture size consumer if CONFIG_CONSUMER*_PATH
345 * has not been defined.
347 #if (CAA_BITS_PER_LONG == 32)
348 if (!consumerd32_bin
[0]) {
349 consumerd32_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
351 if (!consumerd32_libdir
[0]) {
352 consumerd32_libdir
= INSTALL_LIB_PATH
;
354 #elif (CAA_BITS_PER_LONG == 64)
355 if (!consumerd64_bin
[0]) {
356 consumerd64_bin
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
358 if (!consumerd64_libdir
[0]) {
359 consumerd64_libdir
= INSTALL_LIB_PATH
;
362 #error "Unknown bitness"
366 * runtime env. var. overrides the build default.
368 bin
= getenv("LTTNG_CONSUMERD32_BIN");
370 consumerd32_bin
= bin
;
372 bin
= getenv("LTTNG_CONSUMERD64_BIN");
374 consumerd64_bin
= bin
;
376 libdir
= getenv("LTTNG_CONSUMERD32_LIBDIR");
378 consumerd32_libdir
= libdir
;
380 libdir
= getenv("LTTNG_CONSUMERD64_LIBDIR");
382 consumerd64_libdir
= libdir
;
387 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
389 int sessiond_set_thread_pollset(struct lttng_poll_event
*events
, size_t size
)
395 ret
= lttng_poll_create(events
, size
, LTTNG_CLOEXEC
);
401 ret
= lttng_poll_add(events
, thread_quit_pipe
[0], LPOLLIN
| LPOLLERR
);
413 * Check if the thread quit pipe was triggered.
415 * Return 1 if it was triggered else 0;
417 int sessiond_check_thread_quit_pipe(int fd
, uint32_t events
)
419 if (fd
== thread_quit_pipe
[0] && (events
& LPOLLIN
)) {
427 * Init thread quit pipe.
429 * Return -1 on error or 0 if all pipes are created.
431 static int init_thread_quit_pipe(void)
435 ret
= pipe(thread_quit_pipe
);
437 PERROR("thread quit pipe");
441 for (i
= 0; i
< 2; i
++) {
442 ret
= fcntl(thread_quit_pipe
[i
], F_SETFD
, FD_CLOEXEC
);
454 * Stop all threads by closing the thread quit pipe.
456 static void stop_threads(void)
460 /* Stopping all threads */
461 DBG("Terminating all threads");
462 ret
= notify_thread_pipe(thread_quit_pipe
[1]);
464 ERR("write error on thread quit pipe");
467 /* Dispatch thread */
468 CMM_STORE_SHARED(dispatch_thread_exit
, 1);
469 futex_nto1_wake(&ust_cmd_queue
.futex
);
473 * Close every consumer sockets.
475 static void close_consumer_sockets(void)
479 if (kconsumer_data
.err_sock
>= 0) {
480 ret
= close(kconsumer_data
.err_sock
);
482 PERROR("kernel consumer err_sock close");
485 if (ustconsumer32_data
.err_sock
>= 0) {
486 ret
= close(ustconsumer32_data
.err_sock
);
488 PERROR("UST consumerd32 err_sock close");
491 if (ustconsumer64_data
.err_sock
>= 0) {
492 ret
= close(ustconsumer64_data
.err_sock
);
494 PERROR("UST consumerd64 err_sock close");
497 if (kconsumer_data
.cmd_sock
>= 0) {
498 ret
= close(kconsumer_data
.cmd_sock
);
500 PERROR("kernel consumer cmd_sock close");
503 if (ustconsumer32_data
.cmd_sock
>= 0) {
504 ret
= close(ustconsumer32_data
.cmd_sock
);
506 PERROR("UST consumerd32 cmd_sock close");
509 if (ustconsumer64_data
.cmd_sock
>= 0) {
510 ret
= close(ustconsumer64_data
.cmd_sock
);
512 PERROR("UST consumerd64 cmd_sock close");
518 * Generate the full lock file path using the rundir.
520 * Return the snprintf() return value thus a negative value is an error.
522 static int generate_lock_file_path(char *path
, size_t len
)
529 /* Build lockfile path from rundir. */
530 ret
= snprintf(path
, len
, "%s/" DEFAULT_LTTNG_SESSIOND_LOCKFILE
, rundir
);
532 PERROR("snprintf lockfile path");
541 static void cleanup(void)
544 struct ltt_session
*sess
, *stmp
;
550 * Close the thread quit pipe. It has already done its job,
551 * since we are now called.
553 utils_close_pipe(thread_quit_pipe
);
556 * If opt_pidfile is undefined, the default file will be wiped when
557 * removing the rundir.
560 ret
= remove(opt_pidfile
);
562 PERROR("remove pidfile %s", opt_pidfile
);
566 DBG("Removing sessiond and consumerd content of directory %s", rundir
);
569 snprintf(path
, PATH_MAX
,
571 rundir
, DEFAULT_LTTNG_SESSIOND_PIDFILE
);
572 DBG("Removing %s", path
);
575 snprintf(path
, PATH_MAX
, "%s/%s", rundir
,
576 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE
);
577 DBG("Removing %s", path
);
581 snprintf(path
, PATH_MAX
,
582 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
,
584 DBG("Removing %s", path
);
587 snprintf(path
, PATH_MAX
,
588 DEFAULT_KCONSUMERD_PATH
,
590 DBG("Removing directory %s", path
);
593 /* ust consumerd 32 */
594 snprintf(path
, PATH_MAX
,
595 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
,
597 DBG("Removing %s", path
);
600 snprintf(path
, PATH_MAX
,
601 DEFAULT_USTCONSUMERD32_PATH
,
603 DBG("Removing directory %s", path
);
606 /* ust consumerd 64 */
607 snprintf(path
, PATH_MAX
,
608 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
,
610 DBG("Removing %s", path
);
613 snprintf(path
, PATH_MAX
,
614 DEFAULT_USTCONSUMERD64_PATH
,
616 DBG("Removing directory %s", path
);
619 DBG("Cleaning up all sessions");
621 /* Destroy session list mutex */
622 if (session_list_ptr
!= NULL
) {
623 pthread_mutex_destroy(&session_list_ptr
->lock
);
625 /* Cleanup ALL session */
626 cds_list_for_each_entry_safe(sess
, stmp
,
627 &session_list_ptr
->head
, list
) {
628 cmd_destroy_session(sess
, kernel_poll_pipe
[1]);
632 DBG("Cleaning up all agent apps");
633 agent_app_ht_clean();
635 DBG("Closing all UST sockets");
636 ust_app_clean_list();
637 buffer_reg_destroy_registries();
639 if (is_root
&& !opt_no_kernel
) {
640 DBG2("Closing kernel fd");
641 if (kernel_tracer_fd
>= 0) {
642 ret
= close(kernel_tracer_fd
);
647 DBG("Unloading kernel modules");
648 modprobe_remove_lttng_all();
652 close_consumer_sockets();
655 * If the override option is set, the pointer points to a *non* const thus
656 * freeing it even though the variable type is set to const.
658 if (tracing_group_name_override
) {
659 free((void *) tracing_group_name
);
661 if (consumerd32_bin_override
) {
662 free((void *) consumerd32_bin
);
664 if (consumerd64_bin_override
) {
665 free((void *) consumerd64_bin
);
667 if (consumerd32_libdir_override
) {
668 free((void *) consumerd32_libdir
);
670 if (consumerd64_libdir_override
) {
671 free((void *) consumerd64_libdir
);
678 if (opt_load_session_path
) {
679 free(opt_load_session_path
);
683 load_session_destroy_data(load_info
);
688 * Cleanup lock file by deleting it and finaly closing it which will
689 * release the file system lock.
691 if (lockfile_fd
>= 0) {
692 char lockfile_path
[PATH_MAX
];
694 ret
= generate_lock_file_path(lockfile_path
, sizeof(lockfile_path
));
696 ret
= remove(lockfile_path
);
698 PERROR("remove lock file");
700 ret
= close(lockfile_fd
);
702 PERROR("close lock file");
708 * We do NOT rmdir rundir because there are other processes
709 * using it, for instance lttng-relayd, which can start in
710 * parallel with this teardown.
716 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
717 "Matthew, BEET driven development works!%c[%dm",
718 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
723 * Send data on a unix socket using the liblttsessiondcomm API.
725 * Return lttcomm error code.
727 static int send_unix_sock(int sock
, void *buf
, size_t len
)
729 /* Check valid length */
734 return lttcomm_send_unix_sock(sock
, buf
, len
);
738 * Free memory of a command context structure.
740 static void clean_command_ctx(struct command_ctx
**cmd_ctx
)
742 DBG("Clean command context structure");
744 if ((*cmd_ctx
)->llm
) {
745 free((*cmd_ctx
)->llm
);
747 if ((*cmd_ctx
)->lsm
) {
748 free((*cmd_ctx
)->lsm
);
756 * Notify UST applications using the shm mmap futex.
758 static int notify_ust_apps(int active
)
762 DBG("Notifying applications of session daemon state: %d", active
);
764 /* See shm.c for this call implying mmap, shm and futex calls */
765 wait_shm_mmap
= shm_ust_get_mmap(wait_shm_path
, is_root
);
766 if (wait_shm_mmap
== NULL
) {
770 /* Wake waiting process */
771 futex_wait_update((int32_t *) wait_shm_mmap
, active
);
773 /* Apps notified successfully */
781 * Setup the outgoing data buffer for the response (llm) by allocating the
782 * right amount of memory and copying the original information from the lsm
785 * Return total size of the buffer pointed by buf.
787 static int setup_lttng_msg(struct command_ctx
*cmd_ctx
, size_t size
)
793 cmd_ctx
->llm
= zmalloc(sizeof(struct lttcomm_lttng_msg
) + buf_size
);
794 if (cmd_ctx
->llm
== NULL
) {
800 /* Copy common data */
801 cmd_ctx
->llm
->cmd_type
= cmd_ctx
->lsm
->cmd_type
;
802 cmd_ctx
->llm
->pid
= cmd_ctx
->lsm
->domain
.attr
.pid
;
804 cmd_ctx
->llm
->data_size
= size
;
805 cmd_ctx
->lttng_msg_size
= sizeof(struct lttcomm_lttng_msg
) + buf_size
;
814 * Update the kernel poll set of all channel fd available over all tracing
815 * session. Add the wakeup pipe at the end of the set.
817 static int update_kernel_poll(struct lttng_poll_event
*events
)
820 struct ltt_session
*session
;
821 struct ltt_kernel_channel
*channel
;
823 DBG("Updating kernel poll set");
826 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
827 session_lock(session
);
828 if (session
->kernel_session
== NULL
) {
829 session_unlock(session
);
833 cds_list_for_each_entry(channel
,
834 &session
->kernel_session
->channel_list
.head
, list
) {
835 /* Add channel fd to the kernel poll set */
836 ret
= lttng_poll_add(events
, channel
->fd
, LPOLLIN
| LPOLLRDNORM
);
838 session_unlock(session
);
841 DBG("Channel fd %d added to kernel set", channel
->fd
);
843 session_unlock(session
);
845 session_unlock_list();
850 session_unlock_list();
855 * Find the channel fd from 'fd' over all tracing session. When found, check
856 * for new channel stream and send those stream fds to the kernel consumer.
858 * Useful for CPU hotplug feature.
860 static int update_kernel_stream(struct consumer_data
*consumer_data
, int fd
)
863 struct ltt_session
*session
;
864 struct ltt_kernel_session
*ksess
;
865 struct ltt_kernel_channel
*channel
;
867 DBG("Updating kernel streams for channel fd %d", fd
);
870 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
871 session_lock(session
);
872 if (session
->kernel_session
== NULL
) {
873 session_unlock(session
);
876 ksess
= session
->kernel_session
;
878 cds_list_for_each_entry(channel
, &ksess
->channel_list
.head
, list
) {
879 if (channel
->fd
== fd
) {
880 DBG("Channel found, updating kernel streams");
881 ret
= kernel_open_channel_stream(channel
);
885 /* Update the stream global counter */
886 ksess
->stream_count_global
+= ret
;
889 * Have we already sent fds to the consumer? If yes, it means
890 * that tracing is started so it is safe to send our updated
893 if (ksess
->consumer_fds_sent
== 1 && ksess
->consumer
!= NULL
) {
894 struct lttng_ht_iter iter
;
895 struct consumer_socket
*socket
;
898 cds_lfht_for_each_entry(ksess
->consumer
->socks
->ht
,
899 &iter
.iter
, socket
, node
.node
) {
900 pthread_mutex_lock(socket
->lock
);
901 ret
= kernel_consumer_send_channel_stream(socket
,
903 session
->output_traces
? 1 : 0);
904 pthread_mutex_unlock(socket
->lock
);
915 session_unlock(session
);
917 session_unlock_list();
921 session_unlock(session
);
922 session_unlock_list();
927 * For each tracing session, update newly registered apps. The session list
928 * lock MUST be acquired before calling this.
930 static void update_ust_app(int app_sock
)
932 struct ltt_session
*sess
, *stmp
;
934 /* Consumer is in an ERROR state. Stop any application update. */
935 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
936 /* Stop the update process since the consumer is dead. */
940 /* For all tracing session(s) */
941 cds_list_for_each_entry_safe(sess
, stmp
, &session_list_ptr
->head
, list
) {
943 if (sess
->ust_session
) {
944 ust_app_global_update(sess
->ust_session
, app_sock
);
946 session_unlock(sess
);
951 * This thread manage event coming from the kernel.
953 * Features supported in this thread:
956 static void *thread_manage_kernel(void *data
)
958 int ret
, i
, pollfd
, update_poll_flag
= 1, err
= -1;
959 uint32_t revents
, nb_fd
;
961 struct lttng_poll_event events
;
963 DBG("[thread] Thread manage kernel started");
965 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_KERNEL
);
968 * This first step of the while is to clean this structure which could free
969 * non NULL pointers so initialize it before the loop.
971 lttng_poll_init(&events
);
973 if (testpoint(sessiond_thread_manage_kernel
)) {
974 goto error_testpoint
;
977 health_code_update();
979 if (testpoint(sessiond_thread_manage_kernel_before_loop
)) {
980 goto error_testpoint
;
984 health_code_update();
986 if (update_poll_flag
== 1) {
987 /* Clean events object. We are about to populate it again. */
988 lttng_poll_clean(&events
);
990 ret
= sessiond_set_thread_pollset(&events
, 2);
992 goto error_poll_create
;
995 ret
= lttng_poll_add(&events
, kernel_poll_pipe
[0], LPOLLIN
);
1000 /* This will add the available kernel channel if any. */
1001 ret
= update_kernel_poll(&events
);
1005 update_poll_flag
= 0;
1008 DBG("Thread kernel polling");
1010 /* Poll infinite value of time */
1012 health_poll_entry();
1013 ret
= lttng_poll_wait(&events
, -1);
1014 DBG("Thread kernel return from poll on %d fds",
1015 LTTNG_POLL_GETNB(&events
));
1019 * Restart interrupted system call.
1021 if (errno
== EINTR
) {
1025 } else if (ret
== 0) {
1026 /* Should not happen since timeout is infinite */
1027 ERR("Return value of poll is 0 with an infinite timeout.\n"
1028 "This should not have happened! Continuing...");
1034 for (i
= 0; i
< nb_fd
; i
++) {
1035 /* Fetch once the poll data */
1036 revents
= LTTNG_POLL_GETEV(&events
, i
);
1037 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1039 health_code_update();
1042 /* No activity for this FD (poll implementation). */
1046 /* Thread quit pipe has been closed. Killing thread. */
1047 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1053 /* Check for data on kernel pipe */
1054 if (revents
& LPOLLIN
) {
1055 if (pollfd
== kernel_poll_pipe
[0]) {
1056 (void) lttng_read(kernel_poll_pipe
[0],
1059 * Ret value is useless here, if this pipe gets any actions an
1060 * update is required anyway.
1062 update_poll_flag
= 1;
1066 * New CPU detected by the kernel. Adding kernel stream to
1067 * kernel session and updating the kernel consumer
1069 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
1075 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1076 update_poll_flag
= 1;
1079 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1087 lttng_poll_clean(&events
);
1090 utils_close_pipe(kernel_poll_pipe
);
1091 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
1094 ERR("Health error occurred in %s", __func__
);
1095 WARN("Kernel thread died unexpectedly. "
1096 "Kernel tracing can continue but CPU hotplug is disabled.");
1098 health_unregister(health_sessiond
);
1099 DBG("Kernel thread dying");
1104 * Signal pthread condition of the consumer data that the thread.
1106 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
1108 pthread_mutex_lock(&data
->cond_mutex
);
1111 * The state is set before signaling. It can be any value, it's the waiter
1112 * job to correctly interpret this condition variable associated to the
1113 * consumer pthread_cond.
1115 * A value of 0 means that the corresponding thread of the consumer data
1116 * was not started. 1 indicates that the thread has started and is ready
1117 * for action. A negative value means that there was an error during the
1120 data
->consumer_thread_is_ready
= state
;
1121 (void) pthread_cond_signal(&data
->cond
);
1123 pthread_mutex_unlock(&data
->cond_mutex
);
1127 * This thread manage the consumer error sent back to the session daemon.
1129 static void *thread_manage_consumer(void *data
)
1131 int sock
= -1, i
, ret
, pollfd
, err
= -1, should_quit
= 0;
1132 uint32_t revents
, nb_fd
;
1133 enum lttcomm_return_code code
;
1134 struct lttng_poll_event events
;
1135 struct consumer_data
*consumer_data
= data
;
1137 DBG("[thread] Manage consumer started");
1139 rcu_register_thread();
1140 rcu_thread_online();
1142 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
1144 health_code_update();
1147 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1148 * metadata_sock. Nothing more will be added to this poll set.
1150 ret
= sessiond_set_thread_pollset(&events
, 3);
1156 * The error socket here is already in a listening state which was done
1157 * just before spawning this thread to avoid a race between the consumer
1158 * daemon exec trying to connect and the listen() call.
1160 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1165 health_code_update();
1167 /* Infinite blocking call, waiting for transmission */
1169 health_poll_entry();
1171 if (testpoint(sessiond_thread_manage_consumer
)) {
1175 ret
= lttng_poll_wait(&events
, -1);
1179 * Restart interrupted system call.
1181 if (errno
== EINTR
) {
1189 for (i
= 0; i
< nb_fd
; i
++) {
1190 /* Fetch once the poll data */
1191 revents
= LTTNG_POLL_GETEV(&events
, i
);
1192 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1194 health_code_update();
1197 /* No activity for this FD (poll implementation). */
1201 /* Thread quit pipe has been closed. Killing thread. */
1202 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1208 /* Event on the registration socket */
1209 if (pollfd
== consumer_data
->err_sock
) {
1210 if (revents
& LPOLLIN
) {
1212 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1213 ERR("consumer err socket poll error");
1216 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1222 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1228 * Set the CLOEXEC flag. Return code is useless because either way, the
1231 (void) utils_set_fd_cloexec(sock
);
1233 health_code_update();
1235 DBG2("Receiving code from consumer err_sock");
1237 /* Getting status code from kconsumerd */
1238 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1239 sizeof(enum lttcomm_return_code
));
1244 health_code_update();
1245 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1246 /* Connect both socket, command and metadata. */
1247 consumer_data
->cmd_sock
=
1248 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1249 consumer_data
->metadata_fd
=
1250 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1251 if (consumer_data
->cmd_sock
< 0
1252 || consumer_data
->metadata_fd
< 0) {
1253 PERROR("consumer connect cmd socket");
1254 /* On error, signal condition and quit. */
1255 signal_consumer_condition(consumer_data
, -1);
1258 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1259 /* Create metadata socket lock. */
1260 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1261 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1262 PERROR("zmalloc pthread mutex");
1266 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1268 signal_consumer_condition(consumer_data
, 1);
1269 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1270 DBG("Consumer metadata socket ready (fd: %d)",
1271 consumer_data
->metadata_fd
);
1273 ERR("consumer error when waiting for SOCK_READY : %s",
1274 lttcomm_get_readable_code(-code
));
1278 /* Remove the consumerd error sock since we've established a connexion */
1279 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1284 /* Add new accepted error socket. */
1285 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1290 /* Add metadata socket that is successfully connected. */
1291 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1292 LPOLLIN
| LPOLLRDHUP
);
1297 health_code_update();
1299 /* Infinite blocking call, waiting for transmission */
1302 health_code_update();
1304 /* Exit the thread because the thread quit pipe has been triggered. */
1306 /* Not a health error. */
1311 health_poll_entry();
1312 ret
= lttng_poll_wait(&events
, -1);
1316 * Restart interrupted system call.
1318 if (errno
== EINTR
) {
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 health_code_update();
1334 /* No activity for this FD (poll implementation). */
1339 * Thread quit pipe has been triggered, flag that we should stop
1340 * but continue the current loop to handle potential data from
1343 should_quit
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1345 if (pollfd
== sock
) {
1346 /* Event on the consumerd socket */
1347 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1348 && !(revents
& LPOLLIN
)) {
1349 ERR("consumer err socket second poll error");
1352 health_code_update();
1353 /* Wait for any kconsumerd error */
1354 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1355 sizeof(enum lttcomm_return_code
));
1357 ERR("consumer closed the command socket");
1361 ERR("consumer return code : %s",
1362 lttcomm_get_readable_code(-code
));
1365 } else if (pollfd
== consumer_data
->metadata_fd
) {
1366 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)
1367 && !(revents
& LPOLLIN
)) {
1368 ERR("consumer err metadata socket second poll error");
1371 /* UST metadata requests */
1372 ret
= ust_consumer_metadata_request(
1373 &consumer_data
->metadata_sock
);
1375 ERR("Handling metadata request");
1379 /* No need for an else branch all FDs are tested prior. */
1381 health_code_update();
1387 * We lock here because we are about to close the sockets and some other
1388 * thread might be using them so get exclusive access which will abort all
1389 * other consumer command by other threads.
1391 pthread_mutex_lock(&consumer_data
->lock
);
1393 /* Immediately set the consumerd state to stopped */
1394 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1395 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1396 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1397 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1398 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1400 /* Code flow error... */
1404 if (consumer_data
->err_sock
>= 0) {
1405 ret
= close(consumer_data
->err_sock
);
1409 consumer_data
->err_sock
= -1;
1411 if (consumer_data
->cmd_sock
>= 0) {
1412 ret
= close(consumer_data
->cmd_sock
);
1416 consumer_data
->cmd_sock
= -1;
1418 if (consumer_data
->metadata_sock
.fd_ptr
&&
1419 *consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1420 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1432 unlink(consumer_data
->err_unix_sock_path
);
1433 unlink(consumer_data
->cmd_unix_sock_path
);
1434 consumer_data
->pid
= 0;
1435 pthread_mutex_unlock(&consumer_data
->lock
);
1437 /* Cleanup metadata socket mutex. */
1438 if (consumer_data
->metadata_sock
.lock
) {
1439 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1440 free(consumer_data
->metadata_sock
.lock
);
1442 lttng_poll_clean(&events
);
1446 ERR("Health error occurred in %s", __func__
);
1448 health_unregister(health_sessiond
);
1449 DBG("consumer thread cleanup completed");
1451 rcu_thread_offline();
1452 rcu_unregister_thread();
1458 * This thread manage application communication.
1460 static void *thread_manage_apps(void *data
)
1462 int i
, ret
, pollfd
, err
= -1;
1464 uint32_t revents
, nb_fd
;
1465 struct lttng_poll_event events
;
1467 DBG("[thread] Manage application started");
1469 rcu_register_thread();
1470 rcu_thread_online();
1472 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1474 if (testpoint(sessiond_thread_manage_apps
)) {
1475 goto error_testpoint
;
1478 health_code_update();
1480 ret
= sessiond_set_thread_pollset(&events
, 2);
1482 goto error_poll_create
;
1485 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1490 if (testpoint(sessiond_thread_manage_apps_before_loop
)) {
1494 health_code_update();
1497 DBG("Apps thread polling");
1499 /* Inifinite blocking call, waiting for transmission */
1501 health_poll_entry();
1502 ret
= lttng_poll_wait(&events
, -1);
1503 DBG("Apps thread return from poll on %d fds",
1504 LTTNG_POLL_GETNB(&events
));
1508 * Restart interrupted system call.
1510 if (errno
== EINTR
) {
1518 for (i
= 0; i
< nb_fd
; i
++) {
1519 /* Fetch once the poll data */
1520 revents
= LTTNG_POLL_GETEV(&events
, i
);
1521 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1523 health_code_update();
1526 /* No activity for this FD (poll implementation). */
1530 /* Thread quit pipe has been closed. Killing thread. */
1531 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1537 /* Inspect the apps cmd pipe */
1538 if (pollfd
== apps_cmd_pipe
[0]) {
1539 if (revents
& LPOLLIN
) {
1543 size_ret
= lttng_read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1544 if (size_ret
< sizeof(sock
)) {
1545 PERROR("read apps cmd pipe");
1549 health_code_update();
1552 * Since this is a command socket (write then read),
1553 * we only monitor the error events of the socket.
1555 ret
= lttng_poll_add(&events
, sock
,
1556 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1561 DBG("Apps with sock %d added to poll set", sock
);
1562 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1563 ERR("Apps command pipe error");
1566 ERR("Unknown poll events %u for sock %d", revents
, pollfd
);
1571 * At this point, we know that a registered application made
1572 * the event at poll_wait.
1574 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1575 /* Removing from the poll set */
1576 ret
= lttng_poll_del(&events
, pollfd
);
1581 /* Socket closed on remote end. */
1582 ust_app_unregister(pollfd
);
1584 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1589 health_code_update();
1595 lttng_poll_clean(&events
);
1598 utils_close_pipe(apps_cmd_pipe
);
1599 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1602 * We don't clean the UST app hash table here since already registered
1603 * applications can still be controlled so let them be until the session
1604 * daemon dies or the applications stop.
1609 ERR("Health error occurred in %s", __func__
);
1611 health_unregister(health_sessiond
);
1612 DBG("Application communication apps thread cleanup complete");
1613 rcu_thread_offline();
1614 rcu_unregister_thread();
1619 * Send a socket to a thread This is called from the dispatch UST registration
1620 * thread once all sockets are set for the application.
1622 * The sock value can be invalid, we don't really care, the thread will handle
1623 * it and make the necessary cleanup if so.
1625 * On success, return 0 else a negative value being the errno message of the
1628 static int send_socket_to_thread(int fd
, int sock
)
1633 * It's possible that the FD is set as invalid with -1 concurrently just
1634 * before calling this function being a shutdown state of the thread.
1641 ret
= lttng_write(fd
, &sock
, sizeof(sock
));
1642 if (ret
< sizeof(sock
)) {
1643 PERROR("write apps pipe %d", fd
);
1650 /* All good. Don't send back the write positive ret value. */
1657 * Sanitize the wait queue of the dispatch registration thread meaning removing
1658 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1659 * notify socket is never received.
1661 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1663 int ret
, nb_fd
= 0, i
;
1664 unsigned int fd_added
= 0;
1665 struct lttng_poll_event events
;
1666 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1670 lttng_poll_init(&events
);
1672 /* Just skip everything for an empty queue. */
1673 if (!wait_queue
->count
) {
1677 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1682 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1683 &wait_queue
->head
, head
) {
1684 assert(wait_node
->app
);
1685 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1686 LPOLLHUP
| LPOLLERR
);
1699 * Poll but don't block so we can quickly identify the faulty events and
1700 * clean them afterwards from the wait queue.
1702 ret
= lttng_poll_wait(&events
, 0);
1708 for (i
= 0; i
< nb_fd
; i
++) {
1709 /* Get faulty FD. */
1710 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1711 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1714 /* No activity for this FD (poll implementation). */
1718 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1719 &wait_queue
->head
, head
) {
1720 if (pollfd
== wait_node
->app
->sock
&&
1721 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1722 cds_list_del(&wait_node
->head
);
1723 wait_queue
->count
--;
1724 ust_app_destroy(wait_node
->app
);
1728 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
1735 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1739 lttng_poll_clean(&events
);
1743 lttng_poll_clean(&events
);
1745 ERR("Unable to sanitize wait queue");
1750 * Dispatch request from the registration threads to the application
1751 * communication thread.
1753 static void *thread_dispatch_ust_registration(void *data
)
1756 struct cds_wfcq_node
*node
;
1757 struct ust_command
*ust_cmd
= NULL
;
1758 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1759 struct ust_reg_wait_queue wait_queue
= {
1763 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1765 if (testpoint(sessiond_thread_app_reg_dispatch
)) {
1766 goto error_testpoint
;
1769 health_code_update();
1771 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1773 DBG("[thread] Dispatch UST command started");
1775 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1776 health_code_update();
1778 /* Atomically prepare the queue futex */
1779 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1782 struct ust_app
*app
= NULL
;
1786 * Make sure we don't have node(s) that have hung up before receiving
1787 * the notify socket. This is to clean the list in order to avoid
1788 * memory leaks from notify socket that are never seen.
1790 sanitize_wait_queue(&wait_queue
);
1792 health_code_update();
1793 /* Dequeue command for registration */
1794 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1796 DBG("Woken up but nothing in the UST command queue");
1797 /* Continue thread execution */
1801 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1803 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1804 " gid:%d sock:%d name:%s (version %d.%d)",
1805 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1806 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1807 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1808 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1810 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1811 wait_node
= zmalloc(sizeof(*wait_node
));
1813 PERROR("zmalloc wait_node dispatch");
1814 ret
= close(ust_cmd
->sock
);
1816 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1818 lttng_fd_put(LTTNG_FD_APPS
, 1);
1822 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1824 /* Create application object if socket is CMD. */
1825 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1827 if (!wait_node
->app
) {
1828 ret
= close(ust_cmd
->sock
);
1830 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1832 lttng_fd_put(LTTNG_FD_APPS
, 1);
1838 * Add application to the wait queue so we can set the notify
1839 * socket before putting this object in the global ht.
1841 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1846 * We have to continue here since we don't have the notify
1847 * socket and the application MUST be added to the hash table
1848 * only at that moment.
1853 * Look for the application in the local wait queue and set the
1854 * notify socket if found.
1856 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1857 &wait_queue
.head
, head
) {
1858 health_code_update();
1859 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1860 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1861 cds_list_del(&wait_node
->head
);
1863 app
= wait_node
->app
;
1865 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1871 * With no application at this stage the received socket is
1872 * basically useless so close it before we free the cmd data
1873 * structure for good.
1876 ret
= close(ust_cmd
->sock
);
1878 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1880 lttng_fd_put(LTTNG_FD_APPS
, 1);
1887 * @session_lock_list
1889 * Lock the global session list so from the register up to the
1890 * registration done message, no thread can see the application
1891 * and change its state.
1893 session_lock_list();
1897 * Add application to the global hash table. This needs to be
1898 * done before the update to the UST registry can locate the
1903 /* Set app version. This call will print an error if needed. */
1904 (void) ust_app_version(app
);
1906 /* Send notify socket through the notify pipe. */
1907 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1911 session_unlock_list();
1913 * No notify thread, stop the UST tracing. However, this is
1914 * not an internal error of the this thread thus setting
1915 * the health error code to a normal exit.
1922 * Update newly registered application with the tracing
1923 * registry info already enabled information.
1925 update_ust_app(app
->sock
);
1928 * Don't care about return value. Let the manage apps threads
1929 * handle app unregistration upon socket close.
1931 (void) ust_app_register_done(app
);
1934 * Even if the application socket has been closed, send the app
1935 * to the thread and unregistration will take place at that
1938 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1941 session_unlock_list();
1943 * No apps. thread, stop the UST tracing. However, this is
1944 * not an internal error of the this thread thus setting
1945 * the health error code to a normal exit.
1952 session_unlock_list();
1954 } while (node
!= NULL
);
1956 health_poll_entry();
1957 /* Futex wait on queue. Blocking call on futex() */
1958 futex_nto1_wait(&ust_cmd_queue
.futex
);
1961 /* Normal exit, no error */
1965 /* Clean up wait queue. */
1966 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1967 &wait_queue
.head
, head
) {
1968 cds_list_del(&wait_node
->head
);
1973 /* Empty command queue. */
1975 /* Dequeue command for registration */
1976 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1980 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1981 ret
= close(ust_cmd
->sock
);
1983 PERROR("close ust sock exit dispatch %d", ust_cmd
->sock
);
1985 lttng_fd_put(LTTNG_FD_APPS
, 1);
1990 DBG("Dispatch thread dying");
1993 ERR("Health error occurred in %s", __func__
);
1995 health_unregister(health_sessiond
);
2000 * This thread manage application registration.
2002 static void *thread_registration_apps(void *data
)
2004 int sock
= -1, i
, ret
, pollfd
, err
= -1;
2005 uint32_t revents
, nb_fd
;
2006 struct lttng_poll_event events
;
2008 * Get allocated in this thread, enqueued to a global queue, dequeued and
2009 * freed in the manage apps thread.
2011 struct ust_command
*ust_cmd
= NULL
;
2013 DBG("[thread] Manage application registration started");
2015 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
2017 if (testpoint(sessiond_thread_registration_apps
)) {
2018 goto error_testpoint
;
2021 ret
= lttcomm_listen_unix_sock(apps_sock
);
2027 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2028 * more will be added to this poll set.
2030 ret
= sessiond_set_thread_pollset(&events
, 2);
2032 goto error_create_poll
;
2035 /* Add the application registration socket */
2036 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
2038 goto error_poll_add
;
2041 /* Notify all applications to register */
2042 ret
= notify_ust_apps(1);
2044 ERR("Failed to notify applications or create the wait shared memory.\n"
2045 "Execution continues but there might be problem for already\n"
2046 "running applications that wishes to register.");
2050 DBG("Accepting application registration");
2052 /* Inifinite blocking call, waiting for transmission */
2054 health_poll_entry();
2055 ret
= lttng_poll_wait(&events
, -1);
2059 * Restart interrupted system call.
2061 if (errno
== EINTR
) {
2069 for (i
= 0; i
< nb_fd
; i
++) {
2070 health_code_update();
2072 /* Fetch once the poll data */
2073 revents
= LTTNG_POLL_GETEV(&events
, i
);
2074 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2077 /* No activity for this FD (poll implementation). */
2081 /* Thread quit pipe has been closed. Killing thread. */
2082 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
2088 /* Event on the registration socket */
2089 if (pollfd
== apps_sock
) {
2090 if (revents
& LPOLLIN
) {
2091 sock
= lttcomm_accept_unix_sock(apps_sock
);
2097 * Set socket timeout for both receiving and ending.
2098 * app_socket_timeout is in seconds, whereas
2099 * lttcomm_setsockopt_rcv_timeout and
2100 * lttcomm_setsockopt_snd_timeout expect msec as
2103 (void) lttcomm_setsockopt_rcv_timeout(sock
,
2104 app_socket_timeout
* 1000);
2105 (void) lttcomm_setsockopt_snd_timeout(sock
,
2106 app_socket_timeout
* 1000);
2109 * Set the CLOEXEC flag. Return code is useless because
2110 * either way, the show must go on.
2112 (void) utils_set_fd_cloexec(sock
);
2114 /* Create UST registration command for enqueuing */
2115 ust_cmd
= zmalloc(sizeof(struct ust_command
));
2116 if (ust_cmd
== NULL
) {
2117 PERROR("ust command zmalloc");
2126 * Using message-based transmissions to ensure we don't
2127 * have to deal with partially received messages.
2129 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2131 ERR("Exhausted file descriptors allowed for applications.");
2141 health_code_update();
2142 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
2145 /* Close socket of the application. */
2150 lttng_fd_put(LTTNG_FD_APPS
, 1);
2154 health_code_update();
2156 ust_cmd
->sock
= sock
;
2159 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2160 " gid:%d sock:%d name:%s (version %d.%d)",
2161 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
2162 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
2163 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
2164 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
2167 * Lock free enqueue the registration request. The red pill
2168 * has been taken! This apps will be part of the *system*.
2170 cds_wfcq_enqueue(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
, &ust_cmd
->node
);
2173 * Wake the registration queue futex. Implicit memory
2174 * barrier with the exchange in cds_wfcq_enqueue.
2176 futex_nto1_wake(&ust_cmd_queue
.futex
);
2177 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2178 ERR("Register apps socket poll error");
2181 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
2190 /* Notify that the registration thread is gone */
2193 if (apps_sock
>= 0) {
2194 ret
= close(apps_sock
);
2204 lttng_fd_put(LTTNG_FD_APPS
, 1);
2206 unlink(apps_unix_sock_path
);
2209 lttng_poll_clean(&events
);
2213 DBG("UST Registration thread cleanup complete");
2216 ERR("Health error occurred in %s", __func__
);
2218 health_unregister(health_sessiond
);
2224 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2225 * exec or it will fails.
2227 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
2230 struct timespec timeout
;
2232 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2233 consumer_data
->consumer_thread_is_ready
= 0;
2235 /* Setup pthread condition */
2236 ret
= pthread_condattr_init(&consumer_data
->condattr
);
2239 PERROR("pthread_condattr_init consumer data");
2244 * Set the monotonic clock in order to make sure we DO NOT jump in time
2245 * between the clock_gettime() call and the timedwait call. See bug #324
2246 * for a more details and how we noticed it.
2248 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
2251 PERROR("pthread_condattr_setclock consumer data");
2255 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
2258 PERROR("pthread_cond_init consumer data");
2262 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
2265 PERROR("pthread_create consumer");
2270 /* We are about to wait on a pthread condition */
2271 pthread_mutex_lock(&consumer_data
->cond_mutex
);
2273 /* Get time for sem_timedwait absolute timeout */
2274 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2276 * Set the timeout for the condition timed wait even if the clock gettime
2277 * call fails since we might loop on that call and we want to avoid to
2278 * increment the timeout too many times.
2280 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2283 * The following loop COULD be skipped in some conditions so this is why we
2284 * set ret to 0 in order to make sure at least one round of the loop is
2290 * Loop until the condition is reached or when a timeout is reached. Note
2291 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2292 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2293 * possible. This loop does not take any chances and works with both of
2296 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2297 if (clock_ret
< 0) {
2298 PERROR("clock_gettime spawn consumer");
2299 /* Infinite wait for the consumerd thread to be ready */
2300 ret
= pthread_cond_wait(&consumer_data
->cond
,
2301 &consumer_data
->cond_mutex
);
2303 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2304 &consumer_data
->cond_mutex
, &timeout
);
2308 /* Release the pthread condition */
2309 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2313 if (ret
== ETIMEDOUT
) {
2317 * Call has timed out so we kill the kconsumerd_thread and return
2320 ERR("Condition timed out. The consumer thread was never ready."
2322 pth_ret
= pthread_cancel(consumer_data
->thread
);
2324 PERROR("pthread_cancel consumer thread");
2327 PERROR("pthread_cond_wait failed consumer thread");
2329 /* Caller is expecting a negative value on failure. */
2334 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2335 if (consumer_data
->pid
== 0) {
2336 ERR("Consumerd did not start");
2337 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2340 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2349 * Join consumer thread
2351 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2355 /* Consumer pid must be a real one. */
2356 if (consumer_data
->pid
> 0) {
2358 ret
= kill(consumer_data
->pid
, SIGTERM
);
2360 ERR("Error killing consumer daemon");
2363 return pthread_join(consumer_data
->thread
, &status
);
2370 * Fork and exec a consumer daemon (consumerd).
2372 * Return pid if successful else -1.
2374 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2378 const char *consumer_to_use
;
2379 const char *verbosity
;
2382 DBG("Spawning consumerd");
2389 if (opt_verbose_consumer
) {
2390 verbosity
= "--verbose";
2391 } else if (lttng_opt_quiet
) {
2392 verbosity
= "--quiet";
2397 switch (consumer_data
->type
) {
2398 case LTTNG_CONSUMER_KERNEL
:
2400 * Find out which consumerd to execute. We will first try the
2401 * 64-bit path, then the sessiond's installation directory, and
2402 * fallback on the 32-bit one,
2404 DBG3("Looking for a kernel consumer at these locations:");
2405 DBG3(" 1) %s", consumerd64_bin
);
2406 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2407 DBG3(" 3) %s", consumerd32_bin
);
2408 if (stat(consumerd64_bin
, &st
) == 0) {
2409 DBG3("Found location #1");
2410 consumer_to_use
= consumerd64_bin
;
2411 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2412 DBG3("Found location #2");
2413 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2414 } else if (stat(consumerd32_bin
, &st
) == 0) {
2415 DBG3("Found location #3");
2416 consumer_to_use
= consumerd32_bin
;
2418 DBG("Could not find any valid consumerd executable");
2422 DBG("Using kernel consumer at: %s", consumer_to_use
);
2423 ret
= execl(consumer_to_use
,
2424 "lttng-consumerd", verbosity
, "-k",
2425 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2426 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2427 "--group", tracing_group_name
,
2430 case LTTNG_CONSUMER64_UST
:
2432 char *tmpnew
= NULL
;
2434 if (consumerd64_libdir
[0] != '\0') {
2438 tmp
= getenv("LD_LIBRARY_PATH");
2442 tmplen
= strlen("LD_LIBRARY_PATH=")
2443 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2444 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2449 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2450 strcat(tmpnew
, consumerd64_libdir
);
2451 if (tmp
[0] != '\0') {
2452 strcat(tmpnew
, ":");
2453 strcat(tmpnew
, tmp
);
2455 ret
= putenv(tmpnew
);
2462 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2463 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2464 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2465 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2466 "--group", tracing_group_name
,
2468 if (consumerd64_libdir
[0] != '\0') {
2473 case LTTNG_CONSUMER32_UST
:
2475 char *tmpnew
= NULL
;
2477 if (consumerd32_libdir
[0] != '\0') {
2481 tmp
= getenv("LD_LIBRARY_PATH");
2485 tmplen
= strlen("LD_LIBRARY_PATH=")
2486 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2487 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2492 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2493 strcat(tmpnew
, consumerd32_libdir
);
2494 if (tmp
[0] != '\0') {
2495 strcat(tmpnew
, ":");
2496 strcat(tmpnew
, tmp
);
2498 ret
= putenv(tmpnew
);
2505 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2506 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2507 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2508 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2509 "--group", tracing_group_name
,
2511 if (consumerd32_libdir
[0] != '\0') {
2517 PERROR("unknown consumer type");
2521 PERROR("Consumer execl()");
2523 /* Reaching this point, we got a failure on our execl(). */
2525 } else if (pid
> 0) {
2528 PERROR("start consumer fork");
2536 * Spawn the consumerd daemon and session daemon thread.
2538 static int start_consumerd(struct consumer_data
*consumer_data
)
2543 * Set the listen() state on the socket since there is a possible race
2544 * between the exec() of the consumer daemon and this call if place in the
2545 * consumer thread. See bug #366 for more details.
2547 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2552 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2553 if (consumer_data
->pid
!= 0) {
2554 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2558 ret
= spawn_consumerd(consumer_data
);
2560 ERR("Spawning consumerd failed");
2561 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2565 /* Setting up the consumer_data pid */
2566 consumer_data
->pid
= ret
;
2567 DBG2("Consumer pid %d", consumer_data
->pid
);
2568 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2570 DBG2("Spawning consumer control thread");
2571 ret
= spawn_consumer_thread(consumer_data
);
2573 ERR("Fatal error spawning consumer control thread");
2581 /* Cleanup already created sockets on error. */
2582 if (consumer_data
->err_sock
>= 0) {
2585 err
= close(consumer_data
->err_sock
);
2587 PERROR("close consumer data error socket");
2594 * Setup necessary data for kernel tracer action.
2596 static int init_kernel_tracer(void)
2600 /* Modprobe lttng kernel modules */
2601 ret
= modprobe_lttng_control();
2606 /* Open debugfs lttng */
2607 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2608 if (kernel_tracer_fd
< 0) {
2609 DBG("Failed to open %s", module_proc_lttng
);
2614 /* Validate kernel version */
2615 ret
= kernel_validate_version(kernel_tracer_fd
);
2620 ret
= modprobe_lttng_data();
2625 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2629 modprobe_remove_lttng_control();
2630 ret
= close(kernel_tracer_fd
);
2634 kernel_tracer_fd
= -1;
2635 return LTTNG_ERR_KERN_VERSION
;
2638 ret
= close(kernel_tracer_fd
);
2644 modprobe_remove_lttng_control();
2647 WARN("No kernel tracer available");
2648 kernel_tracer_fd
= -1;
2650 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2652 return LTTNG_ERR_KERN_NA
;
2658 * Copy consumer output from the tracing session to the domain session. The
2659 * function also applies the right modification on a per domain basis for the
2660 * trace files destination directory.
2662 * Should *NOT* be called with RCU read-side lock held.
2664 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2667 const char *dir_name
;
2668 struct consumer_output
*consumer
;
2671 assert(session
->consumer
);
2674 case LTTNG_DOMAIN_KERNEL
:
2675 DBG3("Copying tracing session consumer output in kernel session");
2677 * XXX: We should audit the session creation and what this function
2678 * does "extra" in order to avoid a destroy since this function is used
2679 * in the domain session creation (kernel and ust) only. Same for UST
2682 if (session
->kernel_session
->consumer
) {
2683 consumer_output_put(session
->kernel_session
->consumer
);
2685 session
->kernel_session
->consumer
=
2686 consumer_copy_output(session
->consumer
);
2687 /* Ease our life a bit for the next part */
2688 consumer
= session
->kernel_session
->consumer
;
2689 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2691 case LTTNG_DOMAIN_JUL
:
2692 case LTTNG_DOMAIN_LOG4J
:
2693 case LTTNG_DOMAIN_UST
:
2694 DBG3("Copying tracing session consumer output in UST session");
2695 if (session
->ust_session
->consumer
) {
2696 consumer_output_put(session
->ust_session
->consumer
);
2698 session
->ust_session
->consumer
=
2699 consumer_copy_output(session
->consumer
);
2700 /* Ease our life a bit for the next part */
2701 consumer
= session
->ust_session
->consumer
;
2702 dir_name
= DEFAULT_UST_TRACE_DIR
;
2705 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2709 /* Append correct directory to subdir */
2710 strncat(consumer
->subdir
, dir_name
,
2711 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2712 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2721 * Create an UST session and add it to the session ust list.
2723 * Should *NOT* be called with RCU read-side lock held.
2725 static int create_ust_session(struct ltt_session
*session
,
2726 struct lttng_domain
*domain
)
2729 struct ltt_ust_session
*lus
= NULL
;
2733 assert(session
->consumer
);
2735 switch (domain
->type
) {
2736 case LTTNG_DOMAIN_JUL
:
2737 case LTTNG_DOMAIN_LOG4J
:
2738 case LTTNG_DOMAIN_UST
:
2741 ERR("Unknown UST domain on create session %d", domain
->type
);
2742 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2746 DBG("Creating UST session");
2748 lus
= trace_ust_create_session(session
->id
);
2750 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2754 lus
->uid
= session
->uid
;
2755 lus
->gid
= session
->gid
;
2756 lus
->output_traces
= session
->output_traces
;
2757 lus
->snapshot_mode
= session
->snapshot_mode
;
2758 lus
->live_timer_interval
= session
->live_timer
;
2759 session
->ust_session
= lus
;
2761 /* Copy session output to the newly created UST session */
2762 ret
= copy_session_consumer(domain
->type
, session
);
2763 if (ret
!= LTTNG_OK
) {
2771 session
->ust_session
= NULL
;
2776 * Create a kernel tracer session then create the default channel.
2778 static int create_kernel_session(struct ltt_session
*session
)
2782 DBG("Creating kernel session");
2784 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2786 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2790 /* Code flow safety */
2791 assert(session
->kernel_session
);
2793 /* Copy session output to the newly created Kernel session */
2794 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2795 if (ret
!= LTTNG_OK
) {
2799 /* Create directory(ies) on local filesystem. */
2800 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2801 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2802 ret
= run_as_mkdir_recursive(
2803 session
->kernel_session
->consumer
->dst
.trace_path
,
2804 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2806 if (errno
!= EEXIST
) {
2807 ERR("Trace directory creation error");
2813 session
->kernel_session
->uid
= session
->uid
;
2814 session
->kernel_session
->gid
= session
->gid
;
2815 session
->kernel_session
->output_traces
= session
->output_traces
;
2816 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2821 trace_kernel_destroy_session(session
->kernel_session
);
2822 session
->kernel_session
= NULL
;
2827 * Count number of session permitted by uid/gid.
2829 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2832 struct ltt_session
*session
;
2834 DBG("Counting number of available session for UID %d GID %d",
2836 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2838 * Only list the sessions the user can control.
2840 if (!session_access_ok(session
, uid
, gid
)) {
2849 * Process the command requested by the lttng client within the command
2850 * context structure. This function make sure that the return structure (llm)
2851 * is set and ready for transmission before returning.
2853 * Return any error encountered or 0 for success.
2855 * "sock" is only used for special-case var. len data.
2857 * Should *NOT* be called with RCU read-side lock held.
2859 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2863 int need_tracing_session
= 1;
2866 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2870 switch (cmd_ctx
->lsm
->cmd_type
) {
2871 case LTTNG_CREATE_SESSION
:
2872 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2873 case LTTNG_CREATE_SESSION_LIVE
:
2874 case LTTNG_DESTROY_SESSION
:
2875 case LTTNG_LIST_SESSIONS
:
2876 case LTTNG_LIST_DOMAINS
:
2877 case LTTNG_START_TRACE
:
2878 case LTTNG_STOP_TRACE
:
2879 case LTTNG_DATA_PENDING
:
2880 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2881 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2882 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2883 case LTTNG_SNAPSHOT_RECORD
:
2884 case LTTNG_SAVE_SESSION
:
2891 if (opt_no_kernel
&& need_domain
2892 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2894 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2896 ret
= LTTNG_ERR_KERN_NA
;
2901 /* Deny register consumer if we already have a spawned consumer. */
2902 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2903 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2904 if (kconsumer_data
.pid
> 0) {
2905 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2906 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2909 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2913 * Check for command that don't needs to allocate a returned payload. We do
2914 * this here so we don't have to make the call for no payload at each
2917 switch(cmd_ctx
->lsm
->cmd_type
) {
2918 case LTTNG_LIST_SESSIONS
:
2919 case LTTNG_LIST_TRACEPOINTS
:
2920 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2921 case LTTNG_LIST_DOMAINS
:
2922 case LTTNG_LIST_CHANNELS
:
2923 case LTTNG_LIST_EVENTS
:
2924 case LTTNG_LIST_SYSCALLS
:
2927 /* Setup lttng message with no payload */
2928 ret
= setup_lttng_msg(cmd_ctx
, 0);
2930 /* This label does not try to unlock the session */
2931 goto init_setup_error
;
2935 /* Commands that DO NOT need a session. */
2936 switch (cmd_ctx
->lsm
->cmd_type
) {
2937 case LTTNG_CREATE_SESSION
:
2938 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2939 case LTTNG_CREATE_SESSION_LIVE
:
2940 case LTTNG_CALIBRATE
:
2941 case LTTNG_LIST_SESSIONS
:
2942 case LTTNG_LIST_TRACEPOINTS
:
2943 case LTTNG_LIST_SYSCALLS
:
2944 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2945 case LTTNG_SAVE_SESSION
:
2946 need_tracing_session
= 0;
2949 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2951 * We keep the session list lock across _all_ commands
2952 * for now, because the per-session lock does not
2953 * handle teardown properly.
2955 session_lock_list();
2956 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2957 if (cmd_ctx
->session
== NULL
) {
2958 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2961 /* Acquire lock for the session */
2962 session_lock(cmd_ctx
->session
);
2968 * Commands that need a valid session but should NOT create one if none
2969 * exists. Instead of creating one and destroying it when the command is
2970 * handled, process that right before so we save some round trip in useless
2973 switch (cmd_ctx
->lsm
->cmd_type
) {
2974 case LTTNG_DISABLE_CHANNEL
:
2975 case LTTNG_DISABLE_EVENT
:
2976 switch (cmd_ctx
->lsm
->domain
.type
) {
2977 case LTTNG_DOMAIN_KERNEL
:
2978 if (!cmd_ctx
->session
->kernel_session
) {
2979 ret
= LTTNG_ERR_NO_CHANNEL
;
2983 case LTTNG_DOMAIN_JUL
:
2984 case LTTNG_DOMAIN_LOG4J
:
2985 case LTTNG_DOMAIN_UST
:
2986 if (!cmd_ctx
->session
->ust_session
) {
2987 ret
= LTTNG_ERR_NO_CHANNEL
;
2992 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
3004 * Check domain type for specific "pre-action".
3006 switch (cmd_ctx
->lsm
->domain
.type
) {
3007 case LTTNG_DOMAIN_KERNEL
:
3009 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
3013 /* Kernel tracer check */
3014 if (kernel_tracer_fd
== -1) {
3015 /* Basically, load kernel tracer modules */
3016 ret
= init_kernel_tracer();
3022 /* Consumer is in an ERROR state. Report back to client */
3023 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
3024 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3028 /* Need a session for kernel command */
3029 if (need_tracing_session
) {
3030 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3031 ret
= create_kernel_session(cmd_ctx
->session
);
3033 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
3038 /* Start the kernel consumer daemon */
3039 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3040 if (kconsumer_data
.pid
== 0 &&
3041 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3042 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3043 ret
= start_consumerd(&kconsumer_data
);
3045 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3048 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
3050 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3054 * The consumer was just spawned so we need to add the socket to
3055 * the consumer output of the session if exist.
3057 ret
= consumer_create_socket(&kconsumer_data
,
3058 cmd_ctx
->session
->kernel_session
->consumer
);
3065 case LTTNG_DOMAIN_JUL
:
3066 case LTTNG_DOMAIN_LOG4J
:
3067 case LTTNG_DOMAIN_UST
:
3069 if (!ust_app_supported()) {
3070 ret
= LTTNG_ERR_NO_UST
;
3073 /* Consumer is in an ERROR state. Report back to client */
3074 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
3075 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3079 if (need_tracing_session
) {
3080 /* Create UST session if none exist. */
3081 if (cmd_ctx
->session
->ust_session
== NULL
) {
3082 ret
= create_ust_session(cmd_ctx
->session
,
3083 &cmd_ctx
->lsm
->domain
);
3084 if (ret
!= LTTNG_OK
) {
3089 /* Start the UST consumer daemons */
3091 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3092 if (consumerd64_bin
[0] != '\0' &&
3093 ustconsumer64_data
.pid
== 0 &&
3094 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3095 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3096 ret
= start_consumerd(&ustconsumer64_data
);
3098 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
3099 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
3103 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
3104 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3106 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3110 * Setup socket for consumer 64 bit. No need for atomic access
3111 * since it was set above and can ONLY be set in this thread.
3113 ret
= consumer_create_socket(&ustconsumer64_data
,
3114 cmd_ctx
->session
->ust_session
->consumer
);
3120 pthread_mutex_lock(&ustconsumer32_data
.pid_mutex
);
3121 if (consumerd32_bin
[0] != '\0' &&
3122 ustconsumer32_data
.pid
== 0 &&
3123 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3124 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3125 ret
= start_consumerd(&ustconsumer32_data
);
3127 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
3128 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
3132 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
3133 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3135 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3139 * Setup socket for consumer 64 bit. No need for atomic access
3140 * since it was set above and can ONLY be set in this thread.
3142 ret
= consumer_create_socket(&ustconsumer32_data
,
3143 cmd_ctx
->session
->ust_session
->consumer
);
3155 /* Validate consumer daemon state when start/stop trace command */
3156 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
3157 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
3158 switch (cmd_ctx
->lsm
->domain
.type
) {
3159 case LTTNG_DOMAIN_JUL
:
3160 case LTTNG_DOMAIN_LOG4J
:
3161 case LTTNG_DOMAIN_UST
:
3162 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
3163 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3167 case LTTNG_DOMAIN_KERNEL
:
3168 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
3169 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3177 * Check that the UID or GID match that of the tracing session.
3178 * The root user can interact with all sessions.
3180 if (need_tracing_session
) {
3181 if (!session_access_ok(cmd_ctx
->session
,
3182 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3183 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3184 ret
= LTTNG_ERR_EPERM
;
3190 * Send relayd information to consumer as soon as we have a domain and a
3193 if (cmd_ctx
->session
&& need_domain
) {
3195 * Setup relayd if not done yet. If the relayd information was already
3196 * sent to the consumer, this call will gracefully return.
3198 ret
= cmd_setup_relayd(cmd_ctx
->session
);
3199 if (ret
!= LTTNG_OK
) {
3204 /* Process by command type */
3205 switch (cmd_ctx
->lsm
->cmd_type
) {
3206 case LTTNG_ADD_CONTEXT
:
3208 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3209 cmd_ctx
->lsm
->u
.context
.channel_name
,
3210 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
3213 case LTTNG_DISABLE_CHANNEL
:
3215 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3216 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3219 case LTTNG_DISABLE_EVENT
:
3223 * FIXME: handle filter; for now we just receive the filter's
3224 * bytecode along with the filter expression which are sent by
3225 * liblttng-ctl and discard them.
3227 * This fixes an issue where the client may block while sending
3228 * the filter payload and encounter an error because the session
3229 * daemon closes the socket without ever handling this data.
3231 size_t count
= cmd_ctx
->lsm
->u
.disable
.expression_len
+
3232 cmd_ctx
->lsm
->u
.disable
.bytecode_len
;
3235 char data
[LTTNG_FILTER_MAX_LEN
];
3237 DBG("Discarding disable event command payload of size %zu", count
);
3239 ret
= lttcomm_recv_unix_sock(sock
, data
,
3240 count
> sizeof(data
) ? sizeof(data
) : count
);
3245 count
-= (size_t) ret
;
3248 /* FIXME: passing packed structure to non-packed pointer */
3249 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3250 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3251 &cmd_ctx
->lsm
->u
.disable
.event
);
3254 case LTTNG_ENABLE_CHANNEL
:
3256 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3257 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
3260 case LTTNG_ENABLE_EVENT
:
3262 struct lttng_event_exclusion
*exclusion
= NULL
;
3263 struct lttng_filter_bytecode
*bytecode
= NULL
;
3264 char *filter_expression
= NULL
;
3266 /* Handle exclusion events and receive it from the client. */
3267 if (cmd_ctx
->lsm
->u
.enable
.exclusion_count
> 0) {
3268 size_t count
= cmd_ctx
->lsm
->u
.enable
.exclusion_count
;
3270 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
3271 (count
* LTTNG_SYMBOL_NAME_LEN
));
3273 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
3277 DBG("Receiving var len exclusion event list from client ...");
3278 exclusion
->count
= count
;
3279 ret
= lttcomm_recv_unix_sock(sock
, exclusion
->names
,
3280 count
* LTTNG_SYMBOL_NAME_LEN
);
3282 DBG("Nothing recv() from client var len data... continuing");
3285 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
3290 /* Get filter expression from client. */
3291 if (cmd_ctx
->lsm
->u
.enable
.expression_len
> 0) {
3292 size_t expression_len
=
3293 cmd_ctx
->lsm
->u
.enable
.expression_len
;
3295 if (expression_len
> LTTNG_FILTER_MAX_LEN
) {
3296 ret
= LTTNG_ERR_FILTER_INVAL
;
3301 filter_expression
= zmalloc(expression_len
);
3302 if (!filter_expression
) {
3304 ret
= LTTNG_ERR_FILTER_NOMEM
;
3308 /* Receive var. len. data */
3309 DBG("Receiving var len filter's expression from client ...");
3310 ret
= lttcomm_recv_unix_sock(sock
, filter_expression
,
3313 DBG("Nothing recv() from client car len data... continuing");
3315 free(filter_expression
);
3317 ret
= LTTNG_ERR_FILTER_INVAL
;
3322 /* Handle filter and get bytecode from client. */
3323 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> 0) {
3324 size_t bytecode_len
= cmd_ctx
->lsm
->u
.enable
.bytecode_len
;
3326 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3327 ret
= LTTNG_ERR_FILTER_INVAL
;
3328 free(filter_expression
);
3333 bytecode
= zmalloc(bytecode_len
);
3335 free(filter_expression
);
3337 ret
= LTTNG_ERR_FILTER_NOMEM
;
3341 /* Receive var. len. data */
3342 DBG("Receiving var len filter's bytecode from client ...");
3343 ret
= lttcomm_recv_unix_sock(sock
, bytecode
, bytecode_len
);
3345 DBG("Nothing recv() from client car len data... continuing");
3347 free(filter_expression
);
3350 ret
= LTTNG_ERR_FILTER_INVAL
;
3354 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
3355 free(filter_expression
);
3358 ret
= LTTNG_ERR_FILTER_INVAL
;
3363 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3364 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3365 &cmd_ctx
->lsm
->u
.enable
.event
,
3366 filter_expression
, bytecode
, exclusion
,
3367 kernel_poll_pipe
[1]);
3370 case LTTNG_LIST_TRACEPOINTS
:
3372 struct lttng_event
*events
;
3375 session_lock_list();
3376 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3377 session_unlock_list();
3378 if (nb_events
< 0) {
3379 /* Return value is a negative lttng_error_code. */
3385 * Setup lttng message with payload size set to the event list size in
3386 * bytes and then copy list into the llm payload.
3388 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3394 /* Copy event list into message payload */
3395 memcpy(cmd_ctx
->llm
->payload
, events
,
3396 sizeof(struct lttng_event
) * nb_events
);
3403 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3405 struct lttng_event_field
*fields
;
3408 session_lock_list();
3409 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
3411 session_unlock_list();
3412 if (nb_fields
< 0) {
3413 /* Return value is a negative lttng_error_code. */
3419 * Setup lttng message with payload size set to the event list size in
3420 * bytes and then copy list into the llm payload.
3422 ret
= setup_lttng_msg(cmd_ctx
,
3423 sizeof(struct lttng_event_field
) * nb_fields
);
3429 /* Copy event list into message payload */
3430 memcpy(cmd_ctx
->llm
->payload
, fields
,
3431 sizeof(struct lttng_event_field
) * nb_fields
);
3438 case LTTNG_LIST_SYSCALLS
:
3440 struct lttng_event
*events
;
3443 nb_events
= cmd_list_syscalls(&events
);
3444 if (nb_events
< 0) {
3445 /* Return value is a negative lttng_error_code. */
3451 * Setup lttng message with payload size set to the event list size in
3452 * bytes and then copy list into the llm payload.
3454 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3460 /* Copy event list into message payload */
3461 memcpy(cmd_ctx
->llm
->payload
, events
,
3462 sizeof(struct lttng_event
) * nb_events
);
3469 case LTTNG_SET_CONSUMER_URI
:
3472 struct lttng_uri
*uris
;
3474 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3475 len
= nb_uri
* sizeof(struct lttng_uri
);
3478 ret
= LTTNG_ERR_INVALID
;
3482 uris
= zmalloc(len
);
3484 ret
= LTTNG_ERR_FATAL
;
3488 /* Receive variable len data */
3489 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3490 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3492 DBG("No URIs received from client... continuing");
3494 ret
= LTTNG_ERR_SESSION_FAIL
;
3499 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
3501 if (ret
!= LTTNG_OK
) {
3508 case LTTNG_START_TRACE
:
3510 ret
= cmd_start_trace(cmd_ctx
->session
);
3513 case LTTNG_STOP_TRACE
:
3515 ret
= cmd_stop_trace(cmd_ctx
->session
);
3518 case LTTNG_CREATE_SESSION
:
3521 struct lttng_uri
*uris
= NULL
;
3523 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3524 len
= nb_uri
* sizeof(struct lttng_uri
);
3527 uris
= zmalloc(len
);
3529 ret
= LTTNG_ERR_FATAL
;
3533 /* Receive variable len data */
3534 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3535 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3537 DBG("No URIs received from client... continuing");
3539 ret
= LTTNG_ERR_SESSION_FAIL
;
3544 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3545 DBG("Creating session with ONE network URI is a bad call");
3546 ret
= LTTNG_ERR_SESSION_FAIL
;
3552 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3553 &cmd_ctx
->creds
, 0);
3559 case LTTNG_DESTROY_SESSION
:
3561 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3563 /* Set session to NULL so we do not unlock it after free. */
3564 cmd_ctx
->session
= NULL
;
3567 case LTTNG_LIST_DOMAINS
:
3570 struct lttng_domain
*domains
;
3572 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3574 /* Return value is a negative lttng_error_code. */
3579 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3585 /* Copy event list into message payload */
3586 memcpy(cmd_ctx
->llm
->payload
, domains
,
3587 nb_dom
* sizeof(struct lttng_domain
));
3594 case LTTNG_LIST_CHANNELS
:
3597 struct lttng_channel
*channels
= NULL
;
3599 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3600 cmd_ctx
->session
, &channels
);
3602 /* Return value is a negative lttng_error_code. */
3607 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3613 /* Copy event list into message payload */
3614 memcpy(cmd_ctx
->llm
->payload
, channels
,
3615 nb_chan
* sizeof(struct lttng_channel
));
3622 case LTTNG_LIST_EVENTS
:
3625 struct lttng_event
*events
= NULL
;
3627 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3628 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3630 /* Return value is a negative lttng_error_code. */
3635 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3641 /* Copy event list into message payload */
3642 memcpy(cmd_ctx
->llm
->payload
, events
,
3643 nb_event
* sizeof(struct lttng_event
));
3650 case LTTNG_LIST_SESSIONS
:
3652 unsigned int nr_sessions
;
3654 session_lock_list();
3655 nr_sessions
= lttng_sessions_count(
3656 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3657 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3659 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3661 session_unlock_list();
3665 /* Filled the session array */
3666 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3667 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3668 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3670 session_unlock_list();
3675 case LTTNG_CALIBRATE
:
3677 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3678 &cmd_ctx
->lsm
->u
.calibrate
);
3681 case LTTNG_REGISTER_CONSUMER
:
3683 struct consumer_data
*cdata
;
3685 switch (cmd_ctx
->lsm
->domain
.type
) {
3686 case LTTNG_DOMAIN_KERNEL
:
3687 cdata
= &kconsumer_data
;
3690 ret
= LTTNG_ERR_UND
;
3694 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3695 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3698 case LTTNG_DATA_PENDING
:
3700 ret
= cmd_data_pending(cmd_ctx
->session
);
3703 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3705 struct lttcomm_lttng_output_id reply
;
3707 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3708 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3709 if (ret
!= LTTNG_OK
) {
3713 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3718 /* Copy output list into message payload */
3719 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3723 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3725 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3726 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3729 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3732 struct lttng_snapshot_output
*outputs
= NULL
;
3734 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3735 if (nb_output
< 0) {
3740 ret
= setup_lttng_msg(cmd_ctx
,
3741 nb_output
* sizeof(struct lttng_snapshot_output
));
3748 /* Copy output list into message payload */
3749 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3750 nb_output
* sizeof(struct lttng_snapshot_output
));
3757 case LTTNG_SNAPSHOT_RECORD
:
3759 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3760 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3761 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3764 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3767 struct lttng_uri
*uris
= NULL
;
3769 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3770 len
= nb_uri
* sizeof(struct lttng_uri
);
3773 uris
= zmalloc(len
);
3775 ret
= LTTNG_ERR_FATAL
;
3779 /* Receive variable len data */
3780 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3781 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3783 DBG("No URIs received from client... continuing");
3785 ret
= LTTNG_ERR_SESSION_FAIL
;
3790 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3791 DBG("Creating session with ONE network URI is a bad call");
3792 ret
= LTTNG_ERR_SESSION_FAIL
;
3798 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
3799 nb_uri
, &cmd_ctx
->creds
);
3803 case LTTNG_CREATE_SESSION_LIVE
:
3806 struct lttng_uri
*uris
= NULL
;
3808 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3809 len
= nb_uri
* sizeof(struct lttng_uri
);
3812 uris
= zmalloc(len
);
3814 ret
= LTTNG_ERR_FATAL
;
3818 /* Receive variable len data */
3819 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3820 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3822 DBG("No URIs received from client... continuing");
3824 ret
= LTTNG_ERR_SESSION_FAIL
;
3829 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3830 DBG("Creating session with ONE network URI is a bad call");
3831 ret
= LTTNG_ERR_SESSION_FAIL
;
3837 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
3838 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
3842 case LTTNG_SAVE_SESSION
:
3844 ret
= cmd_save_sessions(&cmd_ctx
->lsm
->u
.save_session
.attr
,
3849 ret
= LTTNG_ERR_UND
;
3854 if (cmd_ctx
->llm
== NULL
) {
3855 DBG("Missing llm structure. Allocating one.");
3856 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3860 /* Set return code */
3861 cmd_ctx
->llm
->ret_code
= ret
;
3863 if (cmd_ctx
->session
) {
3864 session_unlock(cmd_ctx
->session
);
3866 if (need_tracing_session
) {
3867 session_unlock_list();
3874 * Thread managing health check socket.
3876 static void *thread_manage_health(void *data
)
3878 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3879 uint32_t revents
, nb_fd
;
3880 struct lttng_poll_event events
;
3881 struct health_comm_msg msg
;
3882 struct health_comm_reply reply
;
3884 DBG("[thread] Manage health check started");
3886 rcu_register_thread();
3888 /* We might hit an error path before this is created. */
3889 lttng_poll_init(&events
);
3891 /* Create unix socket */
3892 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3894 ERR("Unable to create health check Unix socket");
3900 /* lttng health client socket path permissions */
3901 ret
= chown(health_unix_sock_path
, 0,
3902 utils_get_group_id(tracing_group_name
));
3904 ERR("Unable to set group on %s", health_unix_sock_path
);
3910 ret
= chmod(health_unix_sock_path
,
3911 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3913 ERR("Unable to set permissions on %s", health_unix_sock_path
);
3921 * Set the CLOEXEC flag. Return code is useless because either way, the
3924 (void) utils_set_fd_cloexec(sock
);
3926 ret
= lttcomm_listen_unix_sock(sock
);
3932 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3933 * more will be added to this poll set.
3935 ret
= sessiond_set_thread_pollset(&events
, 2);
3940 /* Add the application registration socket */
3941 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3946 sessiond_notify_ready();
3949 DBG("Health check ready");
3951 /* Inifinite blocking call, waiting for transmission */
3953 ret
= lttng_poll_wait(&events
, -1);
3956 * Restart interrupted system call.
3958 if (errno
== EINTR
) {
3966 for (i
= 0; i
< nb_fd
; i
++) {
3967 /* Fetch once the poll data */
3968 revents
= LTTNG_POLL_GETEV(&events
, i
);
3969 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3972 /* No activity for this FD (poll implementation). */
3976 /* Thread quit pipe has been closed. Killing thread. */
3977 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3983 /* Event on the registration socket */
3984 if (pollfd
== sock
) {
3985 if (revents
& LPOLLIN
) {
3987 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3988 ERR("Health socket poll error");
3991 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
3997 new_sock
= lttcomm_accept_unix_sock(sock
);
4003 * Set the CLOEXEC flag. Return code is useless because either way, the
4006 (void) utils_set_fd_cloexec(new_sock
);
4008 DBG("Receiving data from client for health...");
4009 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
4011 DBG("Nothing recv() from client... continuing");
4012 ret
= close(new_sock
);
4020 rcu_thread_online();
4022 memset(&reply
, 0, sizeof(reply
));
4023 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
4025 * health_check_state returns 0 if health is
4028 if (!health_check_state(health_sessiond
, i
)) {
4029 reply
.ret_code
|= 1ULL << i
;
4033 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
4035 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
4037 ERR("Failed to send health data back to client");
4040 /* End of transmission */
4041 ret
= close(new_sock
);
4051 ERR("Health error occurred in %s", __func__
);
4053 DBG("Health check thread dying");
4054 unlink(health_unix_sock_path
);
4062 lttng_poll_clean(&events
);
4064 rcu_unregister_thread();
4069 * This thread manage all clients request using the unix client socket for
4072 static void *thread_manage_clients(void *data
)
4074 int sock
= -1, ret
, i
, pollfd
, err
= -1;
4076 uint32_t revents
, nb_fd
;
4077 struct command_ctx
*cmd_ctx
= NULL
;
4078 struct lttng_poll_event events
;
4080 DBG("[thread] Manage client started");
4082 rcu_register_thread();
4084 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
4086 health_code_update();
4088 ret
= lttcomm_listen_unix_sock(client_sock
);
4094 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4095 * more will be added to this poll set.
4097 ret
= sessiond_set_thread_pollset(&events
, 2);
4099 goto error_create_poll
;
4102 /* Add the application registration socket */
4103 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
4108 sessiond_notify_ready();
4109 ret
= sem_post(&load_info
->message_thread_ready
);
4111 PERROR("sem_post message_thread_ready");
4115 /* This testpoint is after we signal readiness to the parent. */
4116 if (testpoint(sessiond_thread_manage_clients
)) {
4120 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
4124 health_code_update();
4127 DBG("Accepting client command ...");
4129 /* Inifinite blocking call, waiting for transmission */
4131 health_poll_entry();
4132 ret
= lttng_poll_wait(&events
, -1);
4136 * Restart interrupted system call.
4138 if (errno
== EINTR
) {
4146 for (i
= 0; i
< nb_fd
; i
++) {
4147 /* Fetch once the poll data */
4148 revents
= LTTNG_POLL_GETEV(&events
, i
);
4149 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4151 health_code_update();
4154 /* No activity for this FD (poll implementation). */
4158 /* Thread quit pipe has been closed. Killing thread. */
4159 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4165 /* Event on the registration socket */
4166 if (pollfd
== client_sock
) {
4167 if (revents
& LPOLLIN
) {
4169 } else if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4170 ERR("Client socket poll error");
4173 ERR("Unexpected poll events %u for sock %d", revents
, pollfd
);
4179 DBG("Wait for client response");
4181 health_code_update();
4183 sock
= lttcomm_accept_unix_sock(client_sock
);
4189 * Set the CLOEXEC flag. Return code is useless because either way, the
4192 (void) utils_set_fd_cloexec(sock
);
4194 /* Set socket option for credentials retrieval */
4195 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
4200 /* Allocate context command to process the client request */
4201 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
4202 if (cmd_ctx
== NULL
) {
4203 PERROR("zmalloc cmd_ctx");
4207 /* Allocate data buffer for reception */
4208 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
4209 if (cmd_ctx
->lsm
== NULL
) {
4210 PERROR("zmalloc cmd_ctx->lsm");
4214 cmd_ctx
->llm
= NULL
;
4215 cmd_ctx
->session
= NULL
;
4217 health_code_update();
4220 * Data is received from the lttng client. The struct
4221 * lttcomm_session_msg (lsm) contains the command and data request of
4224 DBG("Receiving data from client ...");
4225 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
4226 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
4228 DBG("Nothing recv() from client... continuing");
4234 clean_command_ctx(&cmd_ctx
);
4238 health_code_update();
4240 // TODO: Validate cmd_ctx including sanity check for
4241 // security purpose.
4243 rcu_thread_online();
4245 * This function dispatch the work to the kernel or userspace tracer
4246 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4247 * informations for the client. The command context struct contains
4248 * everything this function may needs.
4250 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
4251 rcu_thread_offline();
4259 * TODO: Inform client somehow of the fatal error. At
4260 * this point, ret < 0 means that a zmalloc failed
4261 * (ENOMEM). Error detected but still accept
4262 * command, unless a socket error has been
4265 clean_command_ctx(&cmd_ctx
);
4269 health_code_update();
4271 DBG("Sending response (size: %d, retcode: %s)",
4272 cmd_ctx
->lttng_msg_size
,
4273 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
4274 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
4276 ERR("Failed to send data back to client");
4279 /* End of transmission */
4286 clean_command_ctx(&cmd_ctx
);
4288 health_code_update();
4300 lttng_poll_clean(&events
);
4301 clean_command_ctx(&cmd_ctx
);
4305 unlink(client_unix_sock_path
);
4306 if (client_sock
>= 0) {
4307 ret
= close(client_sock
);
4315 ERR("Health error occurred in %s", __func__
);
4318 health_unregister(health_sessiond
);
4320 DBG("Client thread dying");
4322 rcu_unregister_thread();
4328 * usage function on stderr
4330 static void usage(void)
4332 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
4333 fprintf(stderr
, " -h, --help Display this usage.\n");
4334 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
4335 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
4336 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
4337 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
4338 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
4339 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
4340 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
4341 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
4342 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
4343 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
4344 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4345 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
4346 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
4347 fprintf(stderr
, " -b, --background Start as a daemon, keeping console open.\n");
4348 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4349 fprintf(stderr
, " -V, --version Show version number.\n");
4350 fprintf(stderr
, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
4351 fprintf(stderr
, " -q, --quiet No output at all.\n");
4352 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
4353 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
4354 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4355 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
4356 fprintf(stderr
, " --agent-tcp-port Agent registration TCP port\n");
4357 fprintf(stderr
, " -f --config PATH Load daemon configuration file\n");
4358 fprintf(stderr
, " -l --load PATH Load session configuration\n");
4359 fprintf(stderr
, " --kmod-probes Specify kernel module probes to load\n");
4360 fprintf(stderr
, " --extra-kmod-probes Specify extra kernel module probes to load\n");
4364 * Take an option from the getopt output and set it in the right variable to be
4367 * Return 0 on success else a negative value.
4369 static int set_option(int opt
, const char *arg
, const char *optname
)
4373 if (arg
&& arg
[0] == '\0') {
4375 * This only happens if the value is read from daemon config
4376 * file. This means the option requires an argument and the
4377 * configuration file contains a line such as:
4386 fprintf(stderr
, "option %s", optname
);
4388 fprintf(stderr
, " with arg %s\n", arg
);
4392 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", arg
);
4395 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", arg
);
4405 * If the override option is set, the pointer points to a
4406 * *non* const thus freeing it even though the variable type is
4409 if (tracing_group_name_override
) {
4410 free((void *) tracing_group_name
);
4412 tracing_group_name
= strdup(arg
);
4413 if (!tracing_group_name
) {
4417 tracing_group_name_override
= 1;
4423 fprintf(stdout
, "%s\n", VERSION
);
4429 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", arg
);
4432 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", arg
);
4435 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", arg
);
4438 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", arg
);
4441 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", arg
);
4444 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", arg
);
4450 lttng_opt_quiet
= 1;
4453 /* Verbose level can increase using multiple -v */
4455 /* Value obtained from config file */
4456 lttng_opt_verbose
= config_parse_value(arg
);
4458 /* -v used on command line */
4459 lttng_opt_verbose
++;
4461 /* Clamp value to [0, 3] */
4462 lttng_opt_verbose
= lttng_opt_verbose
< 0 ? 0 :
4463 (lttng_opt_verbose
<= 3 ? lttng_opt_verbose
: 3);
4467 opt_verbose_consumer
= config_parse_value(arg
);
4469 opt_verbose_consumer
+= 1;
4473 if (consumerd32_bin_override
) {
4474 free((void *) consumerd32_bin
);
4476 consumerd32_bin
= strdup(arg
);
4477 if (!consumerd32_bin
) {
4481 consumerd32_bin_override
= 1;
4484 if (consumerd32_libdir_override
) {
4485 free((void *) consumerd32_libdir
);
4487 consumerd32_libdir
= strdup(arg
);
4488 if (!consumerd32_libdir
) {
4492 consumerd32_libdir_override
= 1;
4495 if (consumerd64_bin_override
) {
4496 free((void *) consumerd64_bin
);
4498 consumerd64_bin
= strdup(arg
);
4499 if (!consumerd64_bin
) {
4503 consumerd64_bin_override
= 1;
4506 if (consumerd64_libdir_override
) {
4507 free((void *) consumerd64_libdir
);
4509 consumerd64_libdir
= strdup(arg
);
4510 if (!consumerd64_libdir
) {
4514 consumerd64_libdir_override
= 1;
4518 opt_pidfile
= strdup(arg
);
4524 case 'J': /* Agent TCP port. */
4529 v
= strtoul(arg
, NULL
, 0);
4530 if (errno
!= 0 || !isdigit(arg
[0])) {
4531 ERR("Wrong value in --agent-tcp-port parameter: %s", arg
);
4534 if (v
== 0 || v
>= 65535) {
4535 ERR("Port overflow in --agent-tcp-port parameter: %s", arg
);
4538 agent_tcp_port
= (uint32_t) v
;
4539 DBG3("Agent TCP port set to non default: %u", agent_tcp_port
);
4543 free(opt_load_session_path
);
4544 opt_load_session_path
= strdup(arg
);
4545 if (!opt_load_session_path
) {
4550 case 'P': /* probe modules list */
4551 free(kmod_probes_list
);
4552 kmod_probes_list
= strdup(arg
);
4553 if (!kmod_probes_list
) {
4559 free(kmod_extra_probes_list
);
4560 kmod_extra_probes_list
= strdup(arg
);
4561 if (!kmod_extra_probes_list
) {
4567 /* This is handled in set_options() thus silent break. */
4570 /* Unknown option or other error.
4571 * Error is printed by getopt, just return */
4576 if (ret
== -EINVAL
) {
4577 const char *opt_name
= "unknown";
4580 for (i
= 0; i
< sizeof(long_options
) / sizeof(struct option
);
4582 if (opt
== long_options
[i
].val
) {
4583 opt_name
= long_options
[i
].name
;
4588 WARN("Invalid argument provided for option \"%s\", using default value.",
4596 * config_entry_handler_cb used to handle options read from a config file.
4597 * See config_entry_handler_cb comment in common/config/config.h for the
4598 * return value conventions.
4600 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
4604 if (!entry
|| !entry
->name
|| !entry
->value
) {
4609 /* Check if the option is to be ignored */
4610 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
4611 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
4616 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1;
4619 /* Ignore if not fully matched. */
4620 if (strcmp(entry
->name
, long_options
[i
].name
)) {
4625 * If the option takes no argument on the command line, we have to
4626 * check if the value is "true". We support non-zero numeric values,
4629 if (!long_options
[i
].has_arg
) {
4630 ret
= config_parse_value(entry
->value
);
4633 WARN("Invalid configuration value \"%s\" for option %s",
4634 entry
->value
, entry
->name
);
4636 /* False, skip boolean config option. */
4641 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
4645 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry
->name
);
4652 * daemon configuration loading and argument parsing
4654 static int set_options(int argc
, char **argv
)
4656 int ret
= 0, c
= 0, option_index
= 0;
4657 int orig_optopt
= optopt
, orig_optind
= optind
;
4659 const char *config_path
= NULL
;
4661 optstring
= utils_generate_optstring(long_options
,
4662 sizeof(long_options
) / sizeof(struct option
));
4668 /* Check for the --config option */
4669 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
4670 &option_index
)) != -1) {
4674 } else if (c
!= 'f') {
4675 /* if not equal to --config option. */
4679 config_path
= utils_expand_path(optarg
);
4681 ERR("Failed to resolve path: %s", optarg
);
4685 ret
= config_get_section_entries(config_path
, config_section_name
,
4686 config_entry_handler
, NULL
);
4689 ERR("Invalid configuration option at line %i", ret
);
4695 /* Reset getopt's global state */
4696 optopt
= orig_optopt
;
4697 optind
= orig_optind
;
4699 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
4704 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
4716 * Creates the two needed socket by the daemon.
4717 * apps_sock - The communication socket for all UST apps.
4718 * client_sock - The communication of the cli tool (lttng).
4720 static int init_daemon_socket(void)
4725 old_umask
= umask(0);
4727 /* Create client tool unix socket */
4728 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4729 if (client_sock
< 0) {
4730 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4735 /* Set the cloexec flag */
4736 ret
= utils_set_fd_cloexec(client_sock
);
4738 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4739 "Continuing but note that the consumer daemon will have a "
4740 "reference to this socket on exec()", client_sock
);
4743 /* File permission MUST be 660 */
4744 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4746 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4751 /* Create the application unix socket */
4752 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4753 if (apps_sock
< 0) {
4754 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4759 /* Set the cloexec flag */
4760 ret
= utils_set_fd_cloexec(apps_sock
);
4762 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4763 "Continuing but note that the consumer daemon will have a "
4764 "reference to this socket on exec()", apps_sock
);
4767 /* File permission MUST be 666 */
4768 ret
= chmod(apps_unix_sock_path
,
4769 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4771 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4776 DBG3("Session daemon client socket %d and application socket %d created",
4777 client_sock
, apps_sock
);
4785 * Check if the global socket is available, and if a daemon is answering at the
4786 * other side. If yes, error is returned.
4788 static int check_existing_daemon(void)
4790 /* Is there anybody out there ? */
4791 if (lttng_session_daemon_alive()) {
4799 * Set the tracing group gid onto the client socket.
4801 * Race window between mkdir and chown is OK because we are going from more
4802 * permissive (root.root) to less permissive (root.tracing).
4804 static int set_permissions(char *rundir
)
4809 gid
= utils_get_group_id(tracing_group_name
);
4811 /* Set lttng run dir */
4812 ret
= chown(rundir
, 0, gid
);
4814 ERR("Unable to set group on %s", rundir
);
4819 * Ensure all applications and tracing group can search the run
4820 * dir. Allow everyone to read the directory, since it does not
4821 * buy us anything to hide its content.
4823 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
4825 ERR("Unable to set permissions on %s", rundir
);
4829 /* lttng client socket path */
4830 ret
= chown(client_unix_sock_path
, 0, gid
);
4832 ERR("Unable to set group on %s", client_unix_sock_path
);
4836 /* kconsumer error socket path */
4837 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
4839 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4843 /* 64-bit ustconsumer error socket path */
4844 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
4846 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4850 /* 32-bit ustconsumer compat32 error socket path */
4851 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
4853 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4857 DBG("All permissions are set");
4863 * Create the lttng run directory needed for all global sockets and pipe.
4865 static int create_lttng_rundir(const char *rundir
)
4869 DBG3("Creating LTTng run directory: %s", rundir
);
4871 ret
= mkdir(rundir
, S_IRWXU
);
4873 if (errno
!= EEXIST
) {
4874 ERR("Unable to create %s", rundir
);
4886 * Setup sockets and directory needed by the kconsumerd communication with the
4889 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4893 char path
[PATH_MAX
];
4895 switch (consumer_data
->type
) {
4896 case LTTNG_CONSUMER_KERNEL
:
4897 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4899 case LTTNG_CONSUMER64_UST
:
4900 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4902 case LTTNG_CONSUMER32_UST
:
4903 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4906 ERR("Consumer type unknown");
4911 DBG2("Creating consumer directory: %s", path
);
4913 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
4915 if (errno
!= EEXIST
) {
4917 ERR("Failed to create %s", path
);
4923 ret
= chown(path
, 0, utils_get_group_id(tracing_group_name
));
4925 ERR("Unable to set group on %s", path
);
4931 /* Create the kconsumerd error unix socket */
4932 consumer_data
->err_sock
=
4933 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4934 if (consumer_data
->err_sock
< 0) {
4935 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4941 * Set the CLOEXEC flag. Return code is useless because either way, the
4944 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
4946 PERROR("utils_set_fd_cloexec");
4947 /* continue anyway */
4950 /* File permission MUST be 660 */
4951 ret
= chmod(consumer_data
->err_unix_sock_path
,
4952 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4954 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4964 * Signal handler for the daemon
4966 * Simply stop all worker threads, leaving main() return gracefully after
4967 * joining all threads and calling cleanup().
4969 static void sighandler(int sig
)
4973 DBG("SIGPIPE caught");
4976 DBG("SIGINT caught");
4980 DBG("SIGTERM caught");
4984 CMM_STORE_SHARED(recv_child_signal
, 1);
4992 * Setup signal handler for :
4993 * SIGINT, SIGTERM, SIGPIPE
4995 static int set_signal_handler(void)
4998 struct sigaction sa
;
5001 if ((ret
= sigemptyset(&sigset
)) < 0) {
5002 PERROR("sigemptyset");
5006 sa
.sa_handler
= sighandler
;
5007 sa
.sa_mask
= sigset
;
5009 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
5010 PERROR("sigaction");
5014 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
5015 PERROR("sigaction");
5019 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
5020 PERROR("sigaction");
5024 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
5025 PERROR("sigaction");
5029 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5035 * Set open files limit to unlimited. This daemon can open a large number of
5036 * file descriptors in order to consumer multiple kernel traces.
5038 static void set_ulimit(void)
5043 /* The kernel does not allowed an infinite limit for open files */
5044 lim
.rlim_cur
= 65535;
5045 lim
.rlim_max
= 65535;
5047 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
5049 PERROR("failed to set open files limit");
5054 * Write pidfile using the rundir and opt_pidfile.
5056 static void write_pidfile(void)
5059 char pidfile_path
[PATH_MAX
];
5064 if (lttng_strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
))) {
5069 /* Build pidfile path from rundir and opt_pidfile. */
5070 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
5071 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
5073 PERROR("snprintf pidfile path");
5079 * Create pid file in rundir. Return value is of no importance. The
5080 * execution will continue even though we are not able to write the file.
5082 (void) utils_create_pid_file(getpid(), pidfile_path
);
5089 * Create lockfile using the rundir and return its fd.
5091 static int create_lockfile(void)
5094 char lockfile_path
[PATH_MAX
];
5096 ret
= generate_lock_file_path(lockfile_path
, sizeof(lockfile_path
));
5101 ret
= utils_create_lock_file(lockfile_path
);
5107 * Write agent TCP port using the rundir.
5109 static void write_agent_port(void)
5112 char path
[PATH_MAX
];
5116 ret
= snprintf(path
, sizeof(path
), "%s/"
5117 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE
, rundir
);
5119 PERROR("snprintf agent port path");
5124 * Create TCP agent port file in rundir. Return value is of no importance.
5125 * The execution will continue even though we are not able to write the
5128 (void) utils_create_pid_file(agent_tcp_port
, path
);
5135 * Start the load session thread and dettach from it so the main thread can
5136 * continue. This does not return a value since whatever the outcome, the main
5137 * thread will continue.
5139 static void start_load_session_thread(void)
5143 /* Create session loading thread. */
5144 ret
= pthread_create(&load_session_thread
, NULL
, thread_load_session
,
5147 PERROR("pthread_create load_session_thread");
5151 ret
= pthread_detach(load_session_thread
);
5153 PERROR("pthread_detach load_session_thread");
5156 /* Everything went well so don't cleanup anything. */
5159 /* The cleanup() function will destroy the load_info data. */
5166 int main(int argc
, char **argv
)
5170 const char *home_path
, *env_app_timeout
;
5172 /* Initialize agent apps ht global variable */
5173 agent_apps_ht_by_sock
= NULL
;
5175 init_kernel_workarounds();
5177 rcu_register_thread();
5179 if ((ret
= set_signal_handler()) < 0) {
5183 setup_consumerd_path();
5185 page_size
= sysconf(_SC_PAGESIZE
);
5186 if (page_size
< 0) {
5187 PERROR("sysconf _SC_PAGESIZE");
5188 page_size
= LONG_MAX
;
5189 WARN("Fallback page size to %ld", page_size
);
5192 /* Parse arguments and load the daemon configuration file */
5194 if ((ret
= set_options(argc
, argv
)) < 0) {
5199 if (opt_daemon
|| opt_background
) {
5202 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
5209 * We are in the child. Make sure all other file descriptors are
5210 * closed, in case we are called with more opened file descriptors than
5211 * the standard ones.
5213 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
5218 /* Create thread quit pipe */
5219 if ((ret
= init_thread_quit_pipe()) < 0) {
5223 /* Check if daemon is UID = 0 */
5224 is_root
= !getuid();
5227 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
5233 /* Create global run dir with root access */
5234 ret
= create_lttng_rundir(rundir
);
5239 if (strlen(apps_unix_sock_path
) == 0) {
5240 snprintf(apps_unix_sock_path
, PATH_MAX
,
5241 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
5244 if (strlen(client_unix_sock_path
) == 0) {
5245 snprintf(client_unix_sock_path
, PATH_MAX
,
5246 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
5249 /* Set global SHM for ust */
5250 if (strlen(wait_shm_path
) == 0) {
5251 snprintf(wait_shm_path
, PATH_MAX
,
5252 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
5255 if (strlen(health_unix_sock_path
) == 0) {
5256 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
5257 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
5260 /* Setup kernel consumerd path */
5261 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
5262 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
5263 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
5264 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
5266 DBG2("Kernel consumer err path: %s",
5267 kconsumer_data
.err_unix_sock_path
);
5268 DBG2("Kernel consumer cmd path: %s",
5269 kconsumer_data
.cmd_unix_sock_path
);
5271 home_path
= utils_get_home_dir();
5272 if (home_path
== NULL
) {
5273 /* TODO: Add --socket PATH option */
5274 ERR("Can't get HOME directory for sockets creation.");
5280 * Create rundir from home path. This will create something like
5283 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
5289 ret
= create_lttng_rundir(rundir
);
5294 if (strlen(apps_unix_sock_path
) == 0) {
5295 snprintf(apps_unix_sock_path
, PATH_MAX
,
5296 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
5299 /* Set the cli tool unix socket path */
5300 if (strlen(client_unix_sock_path
) == 0) {
5301 snprintf(client_unix_sock_path
, PATH_MAX
,
5302 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
5305 /* Set global SHM for ust */
5306 if (strlen(wait_shm_path
) == 0) {
5307 snprintf(wait_shm_path
, PATH_MAX
,
5308 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
5311 /* Set health check Unix path */
5312 if (strlen(health_unix_sock_path
) == 0) {
5313 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
5314 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
5318 lockfile_fd
= create_lockfile();
5319 if (lockfile_fd
< 0) {
5323 /* Set consumer initial state */
5324 kernel_consumerd_state
= CONSUMER_STOPPED
;
5325 ust_consumerd_state
= CONSUMER_STOPPED
;
5327 DBG("Client socket path %s", client_unix_sock_path
);
5328 DBG("Application socket path %s", apps_unix_sock_path
);
5329 DBG("Application wait path %s", wait_shm_path
);
5330 DBG("LTTng run directory path: %s", rundir
);
5332 /* 32 bits consumerd path setup */
5333 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
5334 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
5335 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
5336 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
5338 DBG2("UST consumer 32 bits err path: %s",
5339 ustconsumer32_data
.err_unix_sock_path
);
5340 DBG2("UST consumer 32 bits cmd path: %s",
5341 ustconsumer32_data
.cmd_unix_sock_path
);
5343 /* 64 bits consumerd path setup */
5344 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
5345 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
5346 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
5347 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
5349 DBG2("UST consumer 64 bits err path: %s",
5350 ustconsumer64_data
.err_unix_sock_path
);
5351 DBG2("UST consumer 64 bits cmd path: %s",
5352 ustconsumer64_data
.cmd_unix_sock_path
);
5355 * See if daemon already exist.
5357 if ((ret
= check_existing_daemon()) < 0) {
5358 ERR("Already running daemon.\n");
5360 * We do not goto exit because we must not cleanup()
5361 * because a daemon is already running.
5366 /* After this point, we can safely call cleanup() with "goto exit" */
5369 * Init UST app hash table. Alloc hash table before this point since
5370 * cleanup() can get called after that point.
5375 * Initialize agent app hash table. We allocate the hash table here
5376 * since cleanup() can get called after this point.
5378 if (agent_app_ht_alloc()) {
5379 ERR("Failed to allocate Agent app hash table");
5385 * These actions must be executed as root. We do that *after* setting up
5386 * the sockets path because we MUST make the check for another daemon using
5387 * those paths *before* trying to set the kernel consumer sockets and init
5391 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
5396 /* Setup kernel tracer */
5397 if (!opt_no_kernel
) {
5398 init_kernel_tracer();
5399 if (kernel_tracer_fd
>= 0) {
5400 ret
= syscall_init_table();
5402 ERR("Unable to populate syscall table. Syscall tracing"
5403 " won't work for this session daemon.");
5408 /* Set ulimit for open files */
5411 /* init lttng_fd tracking must be done after set_ulimit. */
5414 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
5419 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
5424 /* Setup the needed unix socket */
5425 if ((ret
= init_daemon_socket()) < 0) {
5429 /* Set credentials to socket */
5430 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
5434 /* Get parent pid if -S, --sig-parent is specified. */
5435 if (opt_sig_parent
) {
5439 /* Setup the kernel pipe for waking up the kernel thread */
5440 if (is_root
&& !opt_no_kernel
) {
5441 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
5446 /* Setup the thread ht_cleanup communication pipe. */
5447 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
5451 /* Setup the thread apps communication pipe. */
5452 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
5456 /* Setup the thread apps notify communication pipe. */
5457 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
5461 /* Initialize global buffer per UID and PID registry. */
5462 buffer_reg_init_uid_registry();
5463 buffer_reg_init_pid_registry();
5465 /* Init UST command queue. */
5466 cds_wfcq_init(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
5469 * Get session list pointer. This pointer MUST NOT be free(). This list is
5470 * statically declared in session.c
5472 session_list_ptr
= session_get_list();
5474 /* Set up max poll set size */
5475 lttng_poll_set_max_size();
5479 /* Check for the application socket timeout env variable. */
5480 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
5481 if (env_app_timeout
) {
5482 app_socket_timeout
= atoi(env_app_timeout
);
5484 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
5490 /* Initialize communication library */
5492 /* This is to get the TCP timeout value. */
5493 lttcomm_inet_init();
5495 if (load_session_init_data(&load_info
) < 0) {
5498 load_info
->path
= opt_load_session_path
;
5501 * Initialize the health check subsystem. This call should set the
5502 * appropriate time values.
5504 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
5505 if (!health_sessiond
) {
5506 PERROR("health_app_create error");
5507 goto exit_health_sessiond_cleanup
;
5510 /* Create thread to clean up RCU hash tables */
5511 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
5512 thread_ht_cleanup
, (void *) NULL
);
5514 PERROR("pthread_create ht_cleanup");
5515 goto exit_ht_cleanup
;
5518 /* Create health-check thread */
5519 ret
= pthread_create(&health_thread
, NULL
,
5520 thread_manage_health
, (void *) NULL
);
5522 PERROR("pthread_create health");
5526 /* Create thread to manage the client socket */
5527 ret
= pthread_create(&client_thread
, NULL
,
5528 thread_manage_clients
, (void *) NULL
);
5530 PERROR("pthread_create clients");
5534 /* Create thread to dispatch registration */
5535 ret
= pthread_create(&dispatch_thread
, NULL
,
5536 thread_dispatch_ust_registration
, (void *) NULL
);
5538 PERROR("pthread_create dispatch");
5542 /* Create thread to manage application registration. */
5543 ret
= pthread_create(®_apps_thread
, NULL
,
5544 thread_registration_apps
, (void *) NULL
);
5546 PERROR("pthread_create registration");
5550 /* Create thread to manage application socket */
5551 ret
= pthread_create(&apps_thread
, NULL
,
5552 thread_manage_apps
, (void *) NULL
);
5554 PERROR("pthread_create apps");
5558 /* Create thread to manage application notify socket */
5559 ret
= pthread_create(&apps_notify_thread
, NULL
,
5560 ust_thread_manage_notify
, (void *) NULL
);
5562 PERROR("pthread_create notify");
5563 goto exit_apps_notify
;
5566 /* Create agent registration thread. */
5567 ret
= pthread_create(&agent_reg_thread
, NULL
,
5568 agent_thread_manage_registration
, (void *) NULL
);
5570 PERROR("pthread_create agent");
5571 goto exit_agent_reg
;
5574 /* Don't start this thread if kernel tracing is not requested nor root */
5575 if (is_root
&& !opt_no_kernel
) {
5576 /* Create kernel thread to manage kernel event */
5577 ret
= pthread_create(&kernel_thread
, NULL
,
5578 thread_manage_kernel
, (void *) NULL
);
5580 PERROR("pthread_create kernel");
5585 /* Load possible session(s). */
5586 start_load_session_thread();
5588 if (is_root
&& !opt_no_kernel
) {
5589 ret
= pthread_join(kernel_thread
, &status
);
5591 PERROR("pthread_join");
5592 goto error
; /* join error, exit without cleanup */
5597 ret
= pthread_join(agent_reg_thread
, &status
);
5599 PERROR("pthread_join agent");
5600 goto error
; /* join error, exit without cleanup */
5604 ret
= pthread_join(apps_notify_thread
, &status
);
5606 PERROR("pthread_join apps notify");
5607 goto error
; /* join error, exit without cleanup */
5611 ret
= pthread_join(apps_thread
, &status
);
5613 PERROR("pthread_join apps");
5614 goto error
; /* join error, exit without cleanup */
5619 ret
= pthread_join(reg_apps_thread
, &status
);
5621 PERROR("pthread_join");
5622 goto error
; /* join error, exit without cleanup */
5626 ret
= pthread_join(dispatch_thread
, &status
);
5628 PERROR("pthread_join");
5629 goto error
; /* join error, exit without cleanup */
5633 ret
= pthread_join(client_thread
, &status
);
5635 PERROR("pthread_join");
5636 goto error
; /* join error, exit without cleanup */
5639 ret
= join_consumer_thread(&kconsumer_data
);
5641 PERROR("join_consumer");
5642 goto error
; /* join error, exit without cleanup */
5645 ret
= join_consumer_thread(&ustconsumer32_data
);
5647 PERROR("join_consumer ust32");
5648 goto error
; /* join error, exit without cleanup */
5651 ret
= join_consumer_thread(&ustconsumer64_data
);
5653 PERROR("join_consumer ust64");
5654 goto error
; /* join error, exit without cleanup */
5658 ret
= pthread_join(health_thread
, &status
);
5660 PERROR("pthread_join health thread");
5661 goto error
; /* join error, exit without cleanup */
5665 ret
= pthread_join(ht_cleanup_thread
, &status
);
5667 PERROR("pthread_join ht cleanup thread");
5668 goto error
; /* join error, exit without cleanup */
5671 health_app_destroy(health_sessiond
);
5672 exit_health_sessiond_cleanup
:
5675 * cleanup() is called when no other thread is running.
5677 rcu_thread_online();
5679 rcu_thread_offline();
5680 rcu_unregister_thread();