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 (pollfd
== kernel_poll_pipe
[0] && (revents
& LPOLLIN
)) {
1055 (void) lttng_read(kernel_poll_pipe
[0],
1058 * Ret value is useless here, if this pipe gets any actions an
1059 * update is required anyway.
1061 update_poll_flag
= 1;
1065 * New CPU detected by the kernel. Adding kernel stream to
1066 * kernel session and updating the kernel consumer
1068 if (revents
& LPOLLIN
) {
1069 ret
= update_kernel_stream(&kconsumer_data
, pollfd
);
1075 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
1076 * and unregister kernel stream at this point.
1085 lttng_poll_clean(&events
);
1088 utils_close_pipe(kernel_poll_pipe
);
1089 kernel_poll_pipe
[0] = kernel_poll_pipe
[1] = -1;
1092 ERR("Health error occurred in %s", __func__
);
1093 WARN("Kernel thread died unexpectedly. "
1094 "Kernel tracing can continue but CPU hotplug is disabled.");
1096 health_unregister(health_sessiond
);
1097 DBG("Kernel thread dying");
1102 * Signal pthread condition of the consumer data that the thread.
1104 static void signal_consumer_condition(struct consumer_data
*data
, int state
)
1106 pthread_mutex_lock(&data
->cond_mutex
);
1109 * The state is set before signaling. It can be any value, it's the waiter
1110 * job to correctly interpret this condition variable associated to the
1111 * consumer pthread_cond.
1113 * A value of 0 means that the corresponding thread of the consumer data
1114 * was not started. 1 indicates that the thread has started and is ready
1115 * for action. A negative value means that there was an error during the
1118 data
->consumer_thread_is_ready
= state
;
1119 (void) pthread_cond_signal(&data
->cond
);
1121 pthread_mutex_unlock(&data
->cond_mutex
);
1125 * This thread manage the consumer error sent back to the session daemon.
1127 static void *thread_manage_consumer(void *data
)
1129 int sock
= -1, i
, ret
, pollfd
, err
= -1, should_quit
= 0;
1130 uint32_t revents
, nb_fd
;
1131 enum lttcomm_return_code code
;
1132 struct lttng_poll_event events
;
1133 struct consumer_data
*consumer_data
= data
;
1135 DBG("[thread] Manage consumer started");
1137 rcu_register_thread();
1138 rcu_thread_online();
1140 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CONSUMER
);
1142 health_code_update();
1145 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1146 * metadata_sock. Nothing more will be added to this poll set.
1148 ret
= sessiond_set_thread_pollset(&events
, 3);
1154 * The error socket here is already in a listening state which was done
1155 * just before spawning this thread to avoid a race between the consumer
1156 * daemon exec trying to connect and the listen() call.
1158 ret
= lttng_poll_add(&events
, consumer_data
->err_sock
, LPOLLIN
| LPOLLRDHUP
);
1163 health_code_update();
1165 /* Infinite blocking call, waiting for transmission */
1167 health_poll_entry();
1169 if (testpoint(sessiond_thread_manage_consumer
)) {
1173 ret
= lttng_poll_wait(&events
, -1);
1177 * Restart interrupted system call.
1179 if (errno
== EINTR
) {
1187 for (i
= 0; i
< nb_fd
; i
++) {
1188 /* Fetch once the poll data */
1189 revents
= LTTNG_POLL_GETEV(&events
, i
);
1190 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1192 health_code_update();
1195 /* No activity for this FD (poll implementation). */
1199 /* Thread quit pipe has been closed. Killing thread. */
1200 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1206 /* Event on the registration socket */
1207 if (pollfd
== consumer_data
->err_sock
) {
1208 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1209 ERR("consumer err socket poll error");
1215 sock
= lttcomm_accept_unix_sock(consumer_data
->err_sock
);
1221 * Set the CLOEXEC flag. Return code is useless because either way, the
1224 (void) utils_set_fd_cloexec(sock
);
1226 health_code_update();
1228 DBG2("Receiving code from consumer err_sock");
1230 /* Getting status code from kconsumerd */
1231 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1232 sizeof(enum lttcomm_return_code
));
1237 health_code_update();
1238 if (code
== LTTCOMM_CONSUMERD_COMMAND_SOCK_READY
) {
1239 /* Connect both socket, command and metadata. */
1240 consumer_data
->cmd_sock
=
1241 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1242 consumer_data
->metadata_fd
=
1243 lttcomm_connect_unix_sock(consumer_data
->cmd_unix_sock_path
);
1244 if (consumer_data
->cmd_sock
< 0
1245 || consumer_data
->metadata_fd
< 0) {
1246 PERROR("consumer connect cmd socket");
1247 /* On error, signal condition and quit. */
1248 signal_consumer_condition(consumer_data
, -1);
1251 consumer_data
->metadata_sock
.fd_ptr
= &consumer_data
->metadata_fd
;
1252 /* Create metadata socket lock. */
1253 consumer_data
->metadata_sock
.lock
= zmalloc(sizeof(pthread_mutex_t
));
1254 if (consumer_data
->metadata_sock
.lock
== NULL
) {
1255 PERROR("zmalloc pthread mutex");
1259 pthread_mutex_init(consumer_data
->metadata_sock
.lock
, NULL
);
1261 signal_consumer_condition(consumer_data
, 1);
1262 DBG("Consumer command socket ready (fd: %d", consumer_data
->cmd_sock
);
1263 DBG("Consumer metadata socket ready (fd: %d)",
1264 consumer_data
->metadata_fd
);
1266 ERR("consumer error when waiting for SOCK_READY : %s",
1267 lttcomm_get_readable_code(-code
));
1271 /* Remove the consumerd error sock since we've established a connexion */
1272 ret
= lttng_poll_del(&events
, consumer_data
->err_sock
);
1277 /* Add new accepted error socket. */
1278 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLRDHUP
);
1283 /* Add metadata socket that is successfully connected. */
1284 ret
= lttng_poll_add(&events
, consumer_data
->metadata_fd
,
1285 LPOLLIN
| LPOLLRDHUP
);
1290 health_code_update();
1292 /* Infinite blocking call, waiting for transmission */
1295 health_code_update();
1297 /* Exit the thread because the thread quit pipe has been triggered. */
1299 /* Not a health error. */
1304 health_poll_entry();
1305 ret
= lttng_poll_wait(&events
, -1);
1309 * Restart interrupted system call.
1311 if (errno
== EINTR
) {
1319 for (i
= 0; i
< nb_fd
; i
++) {
1320 /* Fetch once the poll data */
1321 revents
= LTTNG_POLL_GETEV(&events
, i
);
1322 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1324 health_code_update();
1327 /* No activity for this FD (poll implementation). */
1332 * Thread quit pipe has been triggered, flag that we should stop
1333 * but continue the current loop to handle potential data from
1336 should_quit
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1338 if (pollfd
== sock
) {
1339 /* Event on the consumerd socket */
1340 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1341 ERR("consumer err socket second poll error");
1344 health_code_update();
1345 /* Wait for any kconsumerd error */
1346 ret
= lttcomm_recv_unix_sock(sock
, &code
,
1347 sizeof(enum lttcomm_return_code
));
1349 ERR("consumer closed the command socket");
1353 ERR("consumer return code : %s",
1354 lttcomm_get_readable_code(-code
));
1357 } else if (pollfd
== consumer_data
->metadata_fd
) {
1358 /* UST metadata requests */
1359 ret
= ust_consumer_metadata_request(
1360 &consumer_data
->metadata_sock
);
1362 ERR("Handling metadata request");
1366 /* No need for an else branch all FDs are tested prior. */
1368 health_code_update();
1374 * We lock here because we are about to close the sockets and some other
1375 * thread might be using them so get exclusive access which will abort all
1376 * other consumer command by other threads.
1378 pthread_mutex_lock(&consumer_data
->lock
);
1380 /* Immediately set the consumerd state to stopped */
1381 if (consumer_data
->type
== LTTNG_CONSUMER_KERNEL
) {
1382 uatomic_set(&kernel_consumerd_state
, CONSUMER_ERROR
);
1383 } else if (consumer_data
->type
== LTTNG_CONSUMER64_UST
||
1384 consumer_data
->type
== LTTNG_CONSUMER32_UST
) {
1385 uatomic_set(&ust_consumerd_state
, CONSUMER_ERROR
);
1387 /* Code flow error... */
1391 if (consumer_data
->err_sock
>= 0) {
1392 ret
= close(consumer_data
->err_sock
);
1396 consumer_data
->err_sock
= -1;
1398 if (consumer_data
->cmd_sock
>= 0) {
1399 ret
= close(consumer_data
->cmd_sock
);
1403 consumer_data
->cmd_sock
= -1;
1405 if (consumer_data
->metadata_sock
.fd_ptr
&&
1406 *consumer_data
->metadata_sock
.fd_ptr
>= 0) {
1407 ret
= close(*consumer_data
->metadata_sock
.fd_ptr
);
1419 unlink(consumer_data
->err_unix_sock_path
);
1420 unlink(consumer_data
->cmd_unix_sock_path
);
1421 consumer_data
->pid
= 0;
1422 pthread_mutex_unlock(&consumer_data
->lock
);
1424 /* Cleanup metadata socket mutex. */
1425 if (consumer_data
->metadata_sock
.lock
) {
1426 pthread_mutex_destroy(consumer_data
->metadata_sock
.lock
);
1427 free(consumer_data
->metadata_sock
.lock
);
1429 lttng_poll_clean(&events
);
1433 ERR("Health error occurred in %s", __func__
);
1435 health_unregister(health_sessiond
);
1436 DBG("consumer thread cleanup completed");
1438 rcu_thread_offline();
1439 rcu_unregister_thread();
1445 * This thread manage application communication.
1447 static void *thread_manage_apps(void *data
)
1449 int i
, ret
, pollfd
, err
= -1;
1451 uint32_t revents
, nb_fd
;
1452 struct lttng_poll_event events
;
1454 DBG("[thread] Manage application started");
1456 rcu_register_thread();
1457 rcu_thread_online();
1459 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_MANAGE
);
1461 if (testpoint(sessiond_thread_manage_apps
)) {
1462 goto error_testpoint
;
1465 health_code_update();
1467 ret
= sessiond_set_thread_pollset(&events
, 2);
1469 goto error_poll_create
;
1472 ret
= lttng_poll_add(&events
, apps_cmd_pipe
[0], LPOLLIN
| LPOLLRDHUP
);
1477 if (testpoint(sessiond_thread_manage_apps_before_loop
)) {
1481 health_code_update();
1484 DBG("Apps thread polling");
1486 /* Inifinite blocking call, waiting for transmission */
1488 health_poll_entry();
1489 ret
= lttng_poll_wait(&events
, -1);
1490 DBG("Apps thread return from poll on %d fds",
1491 LTTNG_POLL_GETNB(&events
));
1495 * Restart interrupted system call.
1497 if (errno
== EINTR
) {
1505 for (i
= 0; i
< nb_fd
; i
++) {
1506 /* Fetch once the poll data */
1507 revents
= LTTNG_POLL_GETEV(&events
, i
);
1508 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1510 health_code_update();
1513 /* No activity for this FD (poll implementation). */
1517 /* Thread quit pipe has been closed. Killing thread. */
1518 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
1524 /* Inspect the apps cmd pipe */
1525 if (pollfd
== apps_cmd_pipe
[0]) {
1526 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1527 ERR("Apps command pipe error");
1529 } else if (revents
& LPOLLIN
) {
1533 size_ret
= lttng_read(apps_cmd_pipe
[0], &sock
, sizeof(sock
));
1534 if (size_ret
< sizeof(sock
)) {
1535 PERROR("read apps cmd pipe");
1539 health_code_update();
1542 * We only monitor the error events of the socket. This
1543 * thread does not handle any incoming data from UST
1546 ret
= lttng_poll_add(&events
, sock
,
1547 LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
);
1552 DBG("Apps with sock %d added to poll set", sock
);
1556 * At this point, we know that a registered application made
1557 * the event at poll_wait.
1559 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
1560 /* Removing from the poll set */
1561 ret
= lttng_poll_del(&events
, pollfd
);
1566 /* Socket closed on remote end. */
1567 ust_app_unregister(pollfd
);
1571 health_code_update();
1577 lttng_poll_clean(&events
);
1580 utils_close_pipe(apps_cmd_pipe
);
1581 apps_cmd_pipe
[0] = apps_cmd_pipe
[1] = -1;
1584 * We don't clean the UST app hash table here since already registered
1585 * applications can still be controlled so let them be until the session
1586 * daemon dies or the applications stop.
1591 ERR("Health error occurred in %s", __func__
);
1593 health_unregister(health_sessiond
);
1594 DBG("Application communication apps thread cleanup complete");
1595 rcu_thread_offline();
1596 rcu_unregister_thread();
1601 * Send a socket to a thread This is called from the dispatch UST registration
1602 * thread once all sockets are set for the application.
1604 * The sock value can be invalid, we don't really care, the thread will handle
1605 * it and make the necessary cleanup if so.
1607 * On success, return 0 else a negative value being the errno message of the
1610 static int send_socket_to_thread(int fd
, int sock
)
1615 * It's possible that the FD is set as invalid with -1 concurrently just
1616 * before calling this function being a shutdown state of the thread.
1623 ret
= lttng_write(fd
, &sock
, sizeof(sock
));
1624 if (ret
< sizeof(sock
)) {
1625 PERROR("write apps pipe %d", fd
);
1632 /* All good. Don't send back the write positive ret value. */
1639 * Sanitize the wait queue of the dispatch registration thread meaning removing
1640 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1641 * notify socket is never received.
1643 static void sanitize_wait_queue(struct ust_reg_wait_queue
*wait_queue
)
1645 int ret
, nb_fd
= 0, i
;
1646 unsigned int fd_added
= 0;
1647 struct lttng_poll_event events
;
1648 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1652 lttng_poll_init(&events
);
1654 /* Just skip everything for an empty queue. */
1655 if (!wait_queue
->count
) {
1659 ret
= lttng_poll_create(&events
, wait_queue
->count
, LTTNG_CLOEXEC
);
1664 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1665 &wait_queue
->head
, head
) {
1666 assert(wait_node
->app
);
1667 ret
= lttng_poll_add(&events
, wait_node
->app
->sock
,
1668 LPOLLHUP
| LPOLLERR
);
1681 * Poll but don't block so we can quickly identify the faulty events and
1682 * clean them afterwards from the wait queue.
1684 ret
= lttng_poll_wait(&events
, 0);
1690 for (i
= 0; i
< nb_fd
; i
++) {
1691 /* Get faulty FD. */
1692 uint32_t revents
= LTTNG_POLL_GETEV(&events
, i
);
1693 int pollfd
= LTTNG_POLL_GETFD(&events
, i
);
1696 /* No activity for this FD (poll implementation). */
1700 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1701 &wait_queue
->head
, head
) {
1702 if (pollfd
== wait_node
->app
->sock
&&
1703 (revents
& (LPOLLHUP
| LPOLLERR
))) {
1704 cds_list_del(&wait_node
->head
);
1705 wait_queue
->count
--;
1706 ust_app_destroy(wait_node
->app
);
1714 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd
);
1718 lttng_poll_clean(&events
);
1722 lttng_poll_clean(&events
);
1724 ERR("Unable to sanitize wait queue");
1729 * Dispatch request from the registration threads to the application
1730 * communication thread.
1732 static void *thread_dispatch_ust_registration(void *data
)
1735 struct cds_wfcq_node
*node
;
1736 struct ust_command
*ust_cmd
= NULL
;
1737 struct ust_reg_wait_node
*wait_node
= NULL
, *tmp_wait_node
;
1738 struct ust_reg_wait_queue wait_queue
= {
1742 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH
);
1744 if (testpoint(sessiond_thread_app_reg_dispatch
)) {
1745 goto error_testpoint
;
1748 health_code_update();
1750 CDS_INIT_LIST_HEAD(&wait_queue
.head
);
1752 DBG("[thread] Dispatch UST command started");
1754 while (!CMM_LOAD_SHARED(dispatch_thread_exit
)) {
1755 health_code_update();
1757 /* Atomically prepare the queue futex */
1758 futex_nto1_prepare(&ust_cmd_queue
.futex
);
1761 struct ust_app
*app
= NULL
;
1765 * Make sure we don't have node(s) that have hung up before receiving
1766 * the notify socket. This is to clean the list in order to avoid
1767 * memory leaks from notify socket that are never seen.
1769 sanitize_wait_queue(&wait_queue
);
1771 health_code_update();
1772 /* Dequeue command for registration */
1773 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1775 DBG("Woken up but nothing in the UST command queue");
1776 /* Continue thread execution */
1780 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1782 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1783 " gid:%d sock:%d name:%s (version %d.%d)",
1784 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
1785 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
1786 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
1787 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
1789 if (ust_cmd
->reg_msg
.type
== USTCTL_SOCKET_CMD
) {
1790 wait_node
= zmalloc(sizeof(*wait_node
));
1792 PERROR("zmalloc wait_node dispatch");
1793 ret
= close(ust_cmd
->sock
);
1795 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1797 lttng_fd_put(LTTNG_FD_APPS
, 1);
1801 CDS_INIT_LIST_HEAD(&wait_node
->head
);
1803 /* Create application object if socket is CMD. */
1804 wait_node
->app
= ust_app_create(&ust_cmd
->reg_msg
,
1806 if (!wait_node
->app
) {
1807 ret
= close(ust_cmd
->sock
);
1809 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1811 lttng_fd_put(LTTNG_FD_APPS
, 1);
1817 * Add application to the wait queue so we can set the notify
1818 * socket before putting this object in the global ht.
1820 cds_list_add(&wait_node
->head
, &wait_queue
.head
);
1825 * We have to continue here since we don't have the notify
1826 * socket and the application MUST be added to the hash table
1827 * only at that moment.
1832 * Look for the application in the local wait queue and set the
1833 * notify socket if found.
1835 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1836 &wait_queue
.head
, head
) {
1837 health_code_update();
1838 if (wait_node
->app
->pid
== ust_cmd
->reg_msg
.pid
) {
1839 wait_node
->app
->notify_sock
= ust_cmd
->sock
;
1840 cds_list_del(&wait_node
->head
);
1842 app
= wait_node
->app
;
1844 DBG3("UST app notify socket %d is set", ust_cmd
->sock
);
1850 * With no application at this stage the received socket is
1851 * basically useless so close it before we free the cmd data
1852 * structure for good.
1855 ret
= close(ust_cmd
->sock
);
1857 PERROR("close ust sock dispatch %d", ust_cmd
->sock
);
1859 lttng_fd_put(LTTNG_FD_APPS
, 1);
1866 * @session_lock_list
1868 * Lock the global session list so from the register up to the
1869 * registration done message, no thread can see the application
1870 * and change its state.
1872 session_lock_list();
1876 * Add application to the global hash table. This needs to be
1877 * done before the update to the UST registry can locate the
1882 /* Set app version. This call will print an error if needed. */
1883 (void) ust_app_version(app
);
1885 /* Send notify socket through the notify pipe. */
1886 ret
= send_socket_to_thread(apps_cmd_notify_pipe
[1],
1890 session_unlock_list();
1892 * No notify thread, stop the UST tracing. However, this is
1893 * not an internal error of the this thread thus setting
1894 * the health error code to a normal exit.
1901 * Update newly registered application with the tracing
1902 * registry info already enabled information.
1904 update_ust_app(app
->sock
);
1907 * Don't care about return value. Let the manage apps threads
1908 * handle app unregistration upon socket close.
1910 (void) ust_app_register_done(app
->sock
);
1913 * Even if the application socket has been closed, send the app
1914 * to the thread and unregistration will take place at that
1917 ret
= send_socket_to_thread(apps_cmd_pipe
[1], app
->sock
);
1920 session_unlock_list();
1922 * No apps. thread, stop the UST tracing. However, this is
1923 * not an internal error of the this thread thus setting
1924 * the health error code to a normal exit.
1931 session_unlock_list();
1933 } while (node
!= NULL
);
1935 health_poll_entry();
1936 /* Futex wait on queue. Blocking call on futex() */
1937 futex_nto1_wait(&ust_cmd_queue
.futex
);
1940 /* Normal exit, no error */
1944 /* Clean up wait queue. */
1945 cds_list_for_each_entry_safe(wait_node
, tmp_wait_node
,
1946 &wait_queue
.head
, head
) {
1947 cds_list_del(&wait_node
->head
);
1952 /* Empty command queue. */
1954 /* Dequeue command for registration */
1955 node
= cds_wfcq_dequeue_blocking(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
1959 ust_cmd
= caa_container_of(node
, struct ust_command
, node
);
1960 ret
= close(ust_cmd
->sock
);
1962 PERROR("close ust sock exit dispatch %d", ust_cmd
->sock
);
1964 lttng_fd_put(LTTNG_FD_APPS
, 1);
1969 DBG("Dispatch thread dying");
1972 ERR("Health error occurred in %s", __func__
);
1974 health_unregister(health_sessiond
);
1979 * This thread manage application registration.
1981 static void *thread_registration_apps(void *data
)
1983 int sock
= -1, i
, ret
, pollfd
, err
= -1;
1984 uint32_t revents
, nb_fd
;
1985 struct lttng_poll_event events
;
1987 * Get allocated in this thread, enqueued to a global queue, dequeued and
1988 * freed in the manage apps thread.
1990 struct ust_command
*ust_cmd
= NULL
;
1992 DBG("[thread] Manage application registration started");
1994 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_APP_REG
);
1996 if (testpoint(sessiond_thread_registration_apps
)) {
1997 goto error_testpoint
;
2000 ret
= lttcomm_listen_unix_sock(apps_sock
);
2006 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2007 * more will be added to this poll set.
2009 ret
= sessiond_set_thread_pollset(&events
, 2);
2011 goto error_create_poll
;
2014 /* Add the application registration socket */
2015 ret
= lttng_poll_add(&events
, apps_sock
, LPOLLIN
| LPOLLRDHUP
);
2017 goto error_poll_add
;
2020 /* Notify all applications to register */
2021 ret
= notify_ust_apps(1);
2023 ERR("Failed to notify applications or create the wait shared memory.\n"
2024 "Execution continues but there might be problem for already\n"
2025 "running applications that wishes to register.");
2029 DBG("Accepting application registration");
2031 /* Inifinite blocking call, waiting for transmission */
2033 health_poll_entry();
2034 ret
= lttng_poll_wait(&events
, -1);
2038 * Restart interrupted system call.
2040 if (errno
== EINTR
) {
2048 for (i
= 0; i
< nb_fd
; i
++) {
2049 health_code_update();
2051 /* Fetch once the poll data */
2052 revents
= LTTNG_POLL_GETEV(&events
, i
);
2053 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
2056 /* No activity for this FD (poll implementation). */
2060 /* Thread quit pipe has been closed. Killing thread. */
2061 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
2067 /* Event on the registration socket */
2068 if (pollfd
== apps_sock
) {
2069 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
2070 ERR("Register apps socket poll error");
2072 } else if (revents
& LPOLLIN
) {
2073 sock
= lttcomm_accept_unix_sock(apps_sock
);
2079 * Set socket timeout for both receiving and ending.
2080 * app_socket_timeout is in seconds, whereas
2081 * lttcomm_setsockopt_rcv_timeout and
2082 * lttcomm_setsockopt_snd_timeout expect msec as
2085 (void) lttcomm_setsockopt_rcv_timeout(sock
,
2086 app_socket_timeout
* 1000);
2087 (void) lttcomm_setsockopt_snd_timeout(sock
,
2088 app_socket_timeout
* 1000);
2091 * Set the CLOEXEC flag. Return code is useless because
2092 * either way, the show must go on.
2094 (void) utils_set_fd_cloexec(sock
);
2096 /* Create UST registration command for enqueuing */
2097 ust_cmd
= zmalloc(sizeof(struct ust_command
));
2098 if (ust_cmd
== NULL
) {
2099 PERROR("ust command zmalloc");
2108 * Using message-based transmissions to ensure we don't
2109 * have to deal with partially received messages.
2111 ret
= lttng_fd_get(LTTNG_FD_APPS
, 1);
2113 ERR("Exhausted file descriptors allowed for applications.");
2123 health_code_update();
2124 ret
= ust_app_recv_registration(sock
, &ust_cmd
->reg_msg
);
2127 /* Close socket of the application. */
2132 lttng_fd_put(LTTNG_FD_APPS
, 1);
2136 health_code_update();
2138 ust_cmd
->sock
= sock
;
2141 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2142 " gid:%d sock:%d name:%s (version %d.%d)",
2143 ust_cmd
->reg_msg
.pid
, ust_cmd
->reg_msg
.ppid
,
2144 ust_cmd
->reg_msg
.uid
, ust_cmd
->reg_msg
.gid
,
2145 ust_cmd
->sock
, ust_cmd
->reg_msg
.name
,
2146 ust_cmd
->reg_msg
.major
, ust_cmd
->reg_msg
.minor
);
2149 * Lock free enqueue the registration request. The red pill
2150 * has been taken! This apps will be part of the *system*.
2152 cds_wfcq_enqueue(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
, &ust_cmd
->node
);
2155 * Wake the registration queue futex. Implicit memory
2156 * barrier with the exchange in cds_wfcq_enqueue.
2158 futex_nto1_wake(&ust_cmd_queue
.futex
);
2166 /* Notify that the registration thread is gone */
2169 if (apps_sock
>= 0) {
2170 ret
= close(apps_sock
);
2180 lttng_fd_put(LTTNG_FD_APPS
, 1);
2182 unlink(apps_unix_sock_path
);
2185 lttng_poll_clean(&events
);
2189 DBG("UST Registration thread cleanup complete");
2192 ERR("Health error occurred in %s", __func__
);
2194 health_unregister(health_sessiond
);
2200 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2201 * exec or it will fails.
2203 static int spawn_consumer_thread(struct consumer_data
*consumer_data
)
2206 struct timespec timeout
;
2208 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2209 consumer_data
->consumer_thread_is_ready
= 0;
2211 /* Setup pthread condition */
2212 ret
= pthread_condattr_init(&consumer_data
->condattr
);
2215 PERROR("pthread_condattr_init consumer data");
2220 * Set the monotonic clock in order to make sure we DO NOT jump in time
2221 * between the clock_gettime() call and the timedwait call. See bug #324
2222 * for a more details and how we noticed it.
2224 ret
= pthread_condattr_setclock(&consumer_data
->condattr
, CLOCK_MONOTONIC
);
2227 PERROR("pthread_condattr_setclock consumer data");
2231 ret
= pthread_cond_init(&consumer_data
->cond
, &consumer_data
->condattr
);
2234 PERROR("pthread_cond_init consumer data");
2238 ret
= pthread_create(&consumer_data
->thread
, NULL
, thread_manage_consumer
,
2241 PERROR("pthread_create consumer");
2246 /* We are about to wait on a pthread condition */
2247 pthread_mutex_lock(&consumer_data
->cond_mutex
);
2249 /* Get time for sem_timedwait absolute timeout */
2250 clock_ret
= clock_gettime(CLOCK_MONOTONIC
, &timeout
);
2252 * Set the timeout for the condition timed wait even if the clock gettime
2253 * call fails since we might loop on that call and we want to avoid to
2254 * increment the timeout too many times.
2256 timeout
.tv_sec
+= DEFAULT_SEM_WAIT_TIMEOUT
;
2259 * The following loop COULD be skipped in some conditions so this is why we
2260 * set ret to 0 in order to make sure at least one round of the loop is
2266 * Loop until the condition is reached or when a timeout is reached. Note
2267 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2268 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2269 * possible. This loop does not take any chances and works with both of
2272 while (!consumer_data
->consumer_thread_is_ready
&& ret
!= ETIMEDOUT
) {
2273 if (clock_ret
< 0) {
2274 PERROR("clock_gettime spawn consumer");
2275 /* Infinite wait for the consumerd thread to be ready */
2276 ret
= pthread_cond_wait(&consumer_data
->cond
,
2277 &consumer_data
->cond_mutex
);
2279 ret
= pthread_cond_timedwait(&consumer_data
->cond
,
2280 &consumer_data
->cond_mutex
, &timeout
);
2284 /* Release the pthread condition */
2285 pthread_mutex_unlock(&consumer_data
->cond_mutex
);
2289 if (ret
== ETIMEDOUT
) {
2293 * Call has timed out so we kill the kconsumerd_thread and return
2296 ERR("Condition timed out. The consumer thread was never ready."
2298 pth_ret
= pthread_cancel(consumer_data
->thread
);
2300 PERROR("pthread_cancel consumer thread");
2303 PERROR("pthread_cond_wait failed consumer thread");
2305 /* Caller is expecting a negative value on failure. */
2310 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2311 if (consumer_data
->pid
== 0) {
2312 ERR("Consumerd did not start");
2313 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2316 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2325 * Join consumer thread
2327 static int join_consumer_thread(struct consumer_data
*consumer_data
)
2331 /* Consumer pid must be a real one. */
2332 if (consumer_data
->pid
> 0) {
2334 ret
= kill(consumer_data
->pid
, SIGTERM
);
2336 ERR("Error killing consumer daemon");
2339 return pthread_join(consumer_data
->thread
, &status
);
2346 * Fork and exec a consumer daemon (consumerd).
2348 * Return pid if successful else -1.
2350 static pid_t
spawn_consumerd(struct consumer_data
*consumer_data
)
2354 const char *consumer_to_use
;
2355 const char *verbosity
;
2358 DBG("Spawning consumerd");
2365 if (opt_verbose_consumer
) {
2366 verbosity
= "--verbose";
2367 } else if (lttng_opt_quiet
) {
2368 verbosity
= "--quiet";
2373 switch (consumer_data
->type
) {
2374 case LTTNG_CONSUMER_KERNEL
:
2376 * Find out which consumerd to execute. We will first try the
2377 * 64-bit path, then the sessiond's installation directory, and
2378 * fallback on the 32-bit one,
2380 DBG3("Looking for a kernel consumer at these locations:");
2381 DBG3(" 1) %s", consumerd64_bin
);
2382 DBG3(" 2) %s/%s", INSTALL_BIN_PATH
, CONSUMERD_FILE
);
2383 DBG3(" 3) %s", consumerd32_bin
);
2384 if (stat(consumerd64_bin
, &st
) == 0) {
2385 DBG3("Found location #1");
2386 consumer_to_use
= consumerd64_bin
;
2387 } else if (stat(INSTALL_BIN_PATH
"/" CONSUMERD_FILE
, &st
) == 0) {
2388 DBG3("Found location #2");
2389 consumer_to_use
= INSTALL_BIN_PATH
"/" CONSUMERD_FILE
;
2390 } else if (stat(consumerd32_bin
, &st
) == 0) {
2391 DBG3("Found location #3");
2392 consumer_to_use
= consumerd32_bin
;
2394 DBG("Could not find any valid consumerd executable");
2398 DBG("Using kernel consumer at: %s", consumer_to_use
);
2399 ret
= execl(consumer_to_use
,
2400 "lttng-consumerd", verbosity
, "-k",
2401 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2402 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2403 "--group", tracing_group_name
,
2406 case LTTNG_CONSUMER64_UST
:
2408 char *tmpnew
= NULL
;
2410 if (consumerd64_libdir
[0] != '\0') {
2414 tmp
= getenv("LD_LIBRARY_PATH");
2418 tmplen
= strlen("LD_LIBRARY_PATH=")
2419 + strlen(consumerd64_libdir
) + 1 /* : */ + strlen(tmp
);
2420 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2425 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2426 strcat(tmpnew
, consumerd64_libdir
);
2427 if (tmp
[0] != '\0') {
2428 strcat(tmpnew
, ":");
2429 strcat(tmpnew
, tmp
);
2431 ret
= putenv(tmpnew
);
2438 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin
);
2439 ret
= execl(consumerd64_bin
, "lttng-consumerd", verbosity
, "-u",
2440 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2441 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2442 "--group", tracing_group_name
,
2444 if (consumerd64_libdir
[0] != '\0') {
2449 case LTTNG_CONSUMER32_UST
:
2451 char *tmpnew
= NULL
;
2453 if (consumerd32_libdir
[0] != '\0') {
2457 tmp
= getenv("LD_LIBRARY_PATH");
2461 tmplen
= strlen("LD_LIBRARY_PATH=")
2462 + strlen(consumerd32_libdir
) + 1 /* : */ + strlen(tmp
);
2463 tmpnew
= zmalloc(tmplen
+ 1 /* \0 */);
2468 strcpy(tmpnew
, "LD_LIBRARY_PATH=");
2469 strcat(tmpnew
, consumerd32_libdir
);
2470 if (tmp
[0] != '\0') {
2471 strcat(tmpnew
, ":");
2472 strcat(tmpnew
, tmp
);
2474 ret
= putenv(tmpnew
);
2481 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin
);
2482 ret
= execl(consumerd32_bin
, "lttng-consumerd", verbosity
, "-u",
2483 "--consumerd-cmd-sock", consumer_data
->cmd_unix_sock_path
,
2484 "--consumerd-err-sock", consumer_data
->err_unix_sock_path
,
2485 "--group", tracing_group_name
,
2487 if (consumerd32_libdir
[0] != '\0') {
2493 PERROR("unknown consumer type");
2497 PERROR("Consumer execl()");
2499 /* Reaching this point, we got a failure on our execl(). */
2501 } else if (pid
> 0) {
2504 PERROR("start consumer fork");
2512 * Spawn the consumerd daemon and session daemon thread.
2514 static int start_consumerd(struct consumer_data
*consumer_data
)
2519 * Set the listen() state on the socket since there is a possible race
2520 * between the exec() of the consumer daemon and this call if place in the
2521 * consumer thread. See bug #366 for more details.
2523 ret
= lttcomm_listen_unix_sock(consumer_data
->err_sock
);
2528 pthread_mutex_lock(&consumer_data
->pid_mutex
);
2529 if (consumer_data
->pid
!= 0) {
2530 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2534 ret
= spawn_consumerd(consumer_data
);
2536 ERR("Spawning consumerd failed");
2537 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2541 /* Setting up the consumer_data pid */
2542 consumer_data
->pid
= ret
;
2543 DBG2("Consumer pid %d", consumer_data
->pid
);
2544 pthread_mutex_unlock(&consumer_data
->pid_mutex
);
2546 DBG2("Spawning consumer control thread");
2547 ret
= spawn_consumer_thread(consumer_data
);
2549 ERR("Fatal error spawning consumer control thread");
2557 /* Cleanup already created sockets on error. */
2558 if (consumer_data
->err_sock
>= 0) {
2561 err
= close(consumer_data
->err_sock
);
2563 PERROR("close consumer data error socket");
2570 * Setup necessary data for kernel tracer action.
2572 static int init_kernel_tracer(void)
2576 /* Modprobe lttng kernel modules */
2577 ret
= modprobe_lttng_control();
2582 /* Open debugfs lttng */
2583 kernel_tracer_fd
= open(module_proc_lttng
, O_RDWR
);
2584 if (kernel_tracer_fd
< 0) {
2585 DBG("Failed to open %s", module_proc_lttng
);
2590 /* Validate kernel version */
2591 ret
= kernel_validate_version(kernel_tracer_fd
);
2596 ret
= modprobe_lttng_data();
2601 DBG("Kernel tracer fd %d", kernel_tracer_fd
);
2605 modprobe_remove_lttng_control();
2606 ret
= close(kernel_tracer_fd
);
2610 kernel_tracer_fd
= -1;
2611 return LTTNG_ERR_KERN_VERSION
;
2614 ret
= close(kernel_tracer_fd
);
2620 modprobe_remove_lttng_control();
2623 WARN("No kernel tracer available");
2624 kernel_tracer_fd
= -1;
2626 return LTTNG_ERR_NEED_ROOT_SESSIOND
;
2628 return LTTNG_ERR_KERN_NA
;
2634 * Copy consumer output from the tracing session to the domain session. The
2635 * function also applies the right modification on a per domain basis for the
2636 * trace files destination directory.
2638 * Should *NOT* be called with RCU read-side lock held.
2640 static int copy_session_consumer(int domain
, struct ltt_session
*session
)
2643 const char *dir_name
;
2644 struct consumer_output
*consumer
;
2647 assert(session
->consumer
);
2650 case LTTNG_DOMAIN_KERNEL
:
2651 DBG3("Copying tracing session consumer output in kernel session");
2653 * XXX: We should audit the session creation and what this function
2654 * does "extra" in order to avoid a destroy since this function is used
2655 * in the domain session creation (kernel and ust) only. Same for UST
2658 if (session
->kernel_session
->consumer
) {
2659 consumer_output_put(session
->kernel_session
->consumer
);
2661 session
->kernel_session
->consumer
=
2662 consumer_copy_output(session
->consumer
);
2663 /* Ease our life a bit for the next part */
2664 consumer
= session
->kernel_session
->consumer
;
2665 dir_name
= DEFAULT_KERNEL_TRACE_DIR
;
2667 case LTTNG_DOMAIN_JUL
:
2668 case LTTNG_DOMAIN_LOG4J
:
2669 case LTTNG_DOMAIN_UST
:
2670 DBG3("Copying tracing session consumer output in UST session");
2671 if (session
->ust_session
->consumer
) {
2672 consumer_output_put(session
->ust_session
->consumer
);
2674 session
->ust_session
->consumer
=
2675 consumer_copy_output(session
->consumer
);
2676 /* Ease our life a bit for the next part */
2677 consumer
= session
->ust_session
->consumer
;
2678 dir_name
= DEFAULT_UST_TRACE_DIR
;
2681 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2685 /* Append correct directory to subdir */
2686 strncat(consumer
->subdir
, dir_name
,
2687 sizeof(consumer
->subdir
) - strlen(consumer
->subdir
) - 1);
2688 DBG3("Copy session consumer subdir %s", consumer
->subdir
);
2697 * Create an UST session and add it to the session ust list.
2699 * Should *NOT* be called with RCU read-side lock held.
2701 static int create_ust_session(struct ltt_session
*session
,
2702 struct lttng_domain
*domain
)
2705 struct ltt_ust_session
*lus
= NULL
;
2709 assert(session
->consumer
);
2711 switch (domain
->type
) {
2712 case LTTNG_DOMAIN_JUL
:
2713 case LTTNG_DOMAIN_LOG4J
:
2714 case LTTNG_DOMAIN_UST
:
2717 ERR("Unknown UST domain on create session %d", domain
->type
);
2718 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2722 DBG("Creating UST session");
2724 lus
= trace_ust_create_session(session
->id
);
2726 ret
= LTTNG_ERR_UST_SESS_FAIL
;
2730 lus
->uid
= session
->uid
;
2731 lus
->gid
= session
->gid
;
2732 lus
->output_traces
= session
->output_traces
;
2733 lus
->snapshot_mode
= session
->snapshot_mode
;
2734 lus
->live_timer_interval
= session
->live_timer
;
2735 session
->ust_session
= lus
;
2737 /* Copy session output to the newly created UST session */
2738 ret
= copy_session_consumer(domain
->type
, session
);
2739 if (ret
!= LTTNG_OK
) {
2747 session
->ust_session
= NULL
;
2752 * Create a kernel tracer session then create the default channel.
2754 static int create_kernel_session(struct ltt_session
*session
)
2758 DBG("Creating kernel session");
2760 ret
= kernel_create_session(session
, kernel_tracer_fd
);
2762 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
2766 /* Code flow safety */
2767 assert(session
->kernel_session
);
2769 /* Copy session output to the newly created Kernel session */
2770 ret
= copy_session_consumer(LTTNG_DOMAIN_KERNEL
, session
);
2771 if (ret
!= LTTNG_OK
) {
2775 /* Create directory(ies) on local filesystem. */
2776 if (session
->kernel_session
->consumer
->type
== CONSUMER_DST_LOCAL
&&
2777 strlen(session
->kernel_session
->consumer
->dst
.trace_path
) > 0) {
2778 ret
= run_as_mkdir_recursive(
2779 session
->kernel_session
->consumer
->dst
.trace_path
,
2780 S_IRWXU
| S_IRWXG
, session
->uid
, session
->gid
);
2782 if (errno
!= EEXIST
) {
2783 ERR("Trace directory creation error");
2789 session
->kernel_session
->uid
= session
->uid
;
2790 session
->kernel_session
->gid
= session
->gid
;
2791 session
->kernel_session
->output_traces
= session
->output_traces
;
2792 session
->kernel_session
->snapshot_mode
= session
->snapshot_mode
;
2797 trace_kernel_destroy_session(session
->kernel_session
);
2798 session
->kernel_session
= NULL
;
2803 * Count number of session permitted by uid/gid.
2805 static unsigned int lttng_sessions_count(uid_t uid
, gid_t gid
)
2808 struct ltt_session
*session
;
2810 DBG("Counting number of available session for UID %d GID %d",
2812 cds_list_for_each_entry(session
, &session_list_ptr
->head
, list
) {
2814 * Only list the sessions the user can control.
2816 if (!session_access_ok(session
, uid
, gid
)) {
2825 * Process the command requested by the lttng client within the command
2826 * context structure. This function make sure that the return structure (llm)
2827 * is set and ready for transmission before returning.
2829 * Return any error encountered or 0 for success.
2831 * "sock" is only used for special-case var. len data.
2833 * Should *NOT* be called with RCU read-side lock held.
2835 static int process_client_msg(struct command_ctx
*cmd_ctx
, int sock
,
2839 int need_tracing_session
= 1;
2842 DBG("Processing client command %d", cmd_ctx
->lsm
->cmd_type
);
2846 switch (cmd_ctx
->lsm
->cmd_type
) {
2847 case LTTNG_CREATE_SESSION
:
2848 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2849 case LTTNG_CREATE_SESSION_LIVE
:
2850 case LTTNG_DESTROY_SESSION
:
2851 case LTTNG_LIST_SESSIONS
:
2852 case LTTNG_LIST_DOMAINS
:
2853 case LTTNG_START_TRACE
:
2854 case LTTNG_STOP_TRACE
:
2855 case LTTNG_DATA_PENDING
:
2856 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
2857 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
2858 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
2859 case LTTNG_SNAPSHOT_RECORD
:
2860 case LTTNG_SAVE_SESSION
:
2867 if (opt_no_kernel
&& need_domain
2868 && cmd_ctx
->lsm
->domain
.type
== LTTNG_DOMAIN_KERNEL
) {
2870 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2872 ret
= LTTNG_ERR_KERN_NA
;
2877 /* Deny register consumer if we already have a spawned consumer. */
2878 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_REGISTER_CONSUMER
) {
2879 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
2880 if (kconsumer_data
.pid
> 0) {
2881 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
2882 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2885 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
2889 * Check for command that don't needs to allocate a returned payload. We do
2890 * this here so we don't have to make the call for no payload at each
2893 switch(cmd_ctx
->lsm
->cmd_type
) {
2894 case LTTNG_LIST_SESSIONS
:
2895 case LTTNG_LIST_TRACEPOINTS
:
2896 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2897 case LTTNG_LIST_DOMAINS
:
2898 case LTTNG_LIST_CHANNELS
:
2899 case LTTNG_LIST_EVENTS
:
2900 case LTTNG_LIST_SYSCALLS
:
2903 /* Setup lttng message with no payload */
2904 ret
= setup_lttng_msg(cmd_ctx
, 0);
2906 /* This label does not try to unlock the session */
2907 goto init_setup_error
;
2911 /* Commands that DO NOT need a session. */
2912 switch (cmd_ctx
->lsm
->cmd_type
) {
2913 case LTTNG_CREATE_SESSION
:
2914 case LTTNG_CREATE_SESSION_SNAPSHOT
:
2915 case LTTNG_CREATE_SESSION_LIVE
:
2916 case LTTNG_CALIBRATE
:
2917 case LTTNG_LIST_SESSIONS
:
2918 case LTTNG_LIST_TRACEPOINTS
:
2919 case LTTNG_LIST_SYSCALLS
:
2920 case LTTNG_LIST_TRACEPOINT_FIELDS
:
2921 case LTTNG_SAVE_SESSION
:
2922 need_tracing_session
= 0;
2925 DBG("Getting session %s by name", cmd_ctx
->lsm
->session
.name
);
2927 * We keep the session list lock across _all_ commands
2928 * for now, because the per-session lock does not
2929 * handle teardown properly.
2931 session_lock_list();
2932 cmd_ctx
->session
= session_find_by_name(cmd_ctx
->lsm
->session
.name
);
2933 if (cmd_ctx
->session
== NULL
) {
2934 ret
= LTTNG_ERR_SESS_NOT_FOUND
;
2937 /* Acquire lock for the session */
2938 session_lock(cmd_ctx
->session
);
2944 * Commands that need a valid session but should NOT create one if none
2945 * exists. Instead of creating one and destroying it when the command is
2946 * handled, process that right before so we save some round trip in useless
2949 switch (cmd_ctx
->lsm
->cmd_type
) {
2950 case LTTNG_DISABLE_CHANNEL
:
2951 case LTTNG_DISABLE_EVENT
:
2952 switch (cmd_ctx
->lsm
->domain
.type
) {
2953 case LTTNG_DOMAIN_KERNEL
:
2954 if (!cmd_ctx
->session
->kernel_session
) {
2955 ret
= LTTNG_ERR_NO_CHANNEL
;
2959 case LTTNG_DOMAIN_JUL
:
2960 case LTTNG_DOMAIN_LOG4J
:
2961 case LTTNG_DOMAIN_UST
:
2962 if (!cmd_ctx
->session
->ust_session
) {
2963 ret
= LTTNG_ERR_NO_CHANNEL
;
2968 ret
= LTTNG_ERR_UNKNOWN_DOMAIN
;
2980 * Check domain type for specific "pre-action".
2982 switch (cmd_ctx
->lsm
->domain
.type
) {
2983 case LTTNG_DOMAIN_KERNEL
:
2985 ret
= LTTNG_ERR_NEED_ROOT_SESSIOND
;
2989 /* Kernel tracer check */
2990 if (kernel_tracer_fd
== -1) {
2991 /* Basically, load kernel tracer modules */
2992 ret
= init_kernel_tracer();
2998 /* Consumer is in an ERROR state. Report back to client */
2999 if (uatomic_read(&kernel_consumerd_state
) == CONSUMER_ERROR
) {
3000 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3004 /* Need a session for kernel command */
3005 if (need_tracing_session
) {
3006 if (cmd_ctx
->session
->kernel_session
== NULL
) {
3007 ret
= create_kernel_session(cmd_ctx
->session
);
3009 ret
= LTTNG_ERR_KERN_SESS_FAIL
;
3014 /* Start the kernel consumer daemon */
3015 pthread_mutex_lock(&kconsumer_data
.pid_mutex
);
3016 if (kconsumer_data
.pid
== 0 &&
3017 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3018 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3019 ret
= start_consumerd(&kconsumer_data
);
3021 ret
= LTTNG_ERR_KERN_CONSUMER_FAIL
;
3024 uatomic_set(&kernel_consumerd_state
, CONSUMER_STARTED
);
3026 pthread_mutex_unlock(&kconsumer_data
.pid_mutex
);
3030 * The consumer was just spawned so we need to add the socket to
3031 * the consumer output of the session if exist.
3033 ret
= consumer_create_socket(&kconsumer_data
,
3034 cmd_ctx
->session
->kernel_session
->consumer
);
3041 case LTTNG_DOMAIN_JUL
:
3042 case LTTNG_DOMAIN_LOG4J
:
3043 case LTTNG_DOMAIN_UST
:
3045 if (!ust_app_supported()) {
3046 ret
= LTTNG_ERR_NO_UST
;
3049 /* Consumer is in an ERROR state. Report back to client */
3050 if (uatomic_read(&ust_consumerd_state
) == CONSUMER_ERROR
) {
3051 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3055 if (need_tracing_session
) {
3056 /* Create UST session if none exist. */
3057 if (cmd_ctx
->session
->ust_session
== NULL
) {
3058 ret
= create_ust_session(cmd_ctx
->session
,
3059 &cmd_ctx
->lsm
->domain
);
3060 if (ret
!= LTTNG_OK
) {
3065 /* Start the UST consumer daemons */
3067 pthread_mutex_lock(&ustconsumer64_data
.pid_mutex
);
3068 if (consumerd64_bin
[0] != '\0' &&
3069 ustconsumer64_data
.pid
== 0 &&
3070 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3071 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3072 ret
= start_consumerd(&ustconsumer64_data
);
3074 ret
= LTTNG_ERR_UST_CONSUMER64_FAIL
;
3075 uatomic_set(&ust_consumerd64_fd
, -EINVAL
);
3079 uatomic_set(&ust_consumerd64_fd
, ustconsumer64_data
.cmd_sock
);
3080 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3082 pthread_mutex_unlock(&ustconsumer64_data
.pid_mutex
);
3086 * Setup socket for consumer 64 bit. No need for atomic access
3087 * since it was set above and can ONLY be set in this thread.
3089 ret
= consumer_create_socket(&ustconsumer64_data
,
3090 cmd_ctx
->session
->ust_session
->consumer
);
3096 pthread_mutex_lock(&ustconsumer32_data
.pid_mutex
);
3097 if (consumerd32_bin
[0] != '\0' &&
3098 ustconsumer32_data
.pid
== 0 &&
3099 cmd_ctx
->lsm
->cmd_type
!= LTTNG_REGISTER_CONSUMER
) {
3100 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3101 ret
= start_consumerd(&ustconsumer32_data
);
3103 ret
= LTTNG_ERR_UST_CONSUMER32_FAIL
;
3104 uatomic_set(&ust_consumerd32_fd
, -EINVAL
);
3108 uatomic_set(&ust_consumerd32_fd
, ustconsumer32_data
.cmd_sock
);
3109 uatomic_set(&ust_consumerd_state
, CONSUMER_STARTED
);
3111 pthread_mutex_unlock(&ustconsumer32_data
.pid_mutex
);
3115 * Setup socket for consumer 64 bit. No need for atomic access
3116 * since it was set above and can ONLY be set in this thread.
3118 ret
= consumer_create_socket(&ustconsumer32_data
,
3119 cmd_ctx
->session
->ust_session
->consumer
);
3131 /* Validate consumer daemon state when start/stop trace command */
3132 if (cmd_ctx
->lsm
->cmd_type
== LTTNG_START_TRACE
||
3133 cmd_ctx
->lsm
->cmd_type
== LTTNG_STOP_TRACE
) {
3134 switch (cmd_ctx
->lsm
->domain
.type
) {
3135 case LTTNG_DOMAIN_JUL
:
3136 case LTTNG_DOMAIN_LOG4J
:
3137 case LTTNG_DOMAIN_UST
:
3138 if (uatomic_read(&ust_consumerd_state
) != CONSUMER_STARTED
) {
3139 ret
= LTTNG_ERR_NO_USTCONSUMERD
;
3143 case LTTNG_DOMAIN_KERNEL
:
3144 if (uatomic_read(&kernel_consumerd_state
) != CONSUMER_STARTED
) {
3145 ret
= LTTNG_ERR_NO_KERNCONSUMERD
;
3153 * Check that the UID or GID match that of the tracing session.
3154 * The root user can interact with all sessions.
3156 if (need_tracing_session
) {
3157 if (!session_access_ok(cmd_ctx
->session
,
3158 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3159 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
))) {
3160 ret
= LTTNG_ERR_EPERM
;
3166 * Send relayd information to consumer as soon as we have a domain and a
3169 if (cmd_ctx
->session
&& need_domain
) {
3171 * Setup relayd if not done yet. If the relayd information was already
3172 * sent to the consumer, this call will gracefully return.
3174 ret
= cmd_setup_relayd(cmd_ctx
->session
);
3175 if (ret
!= LTTNG_OK
) {
3180 /* Process by command type */
3181 switch (cmd_ctx
->lsm
->cmd_type
) {
3182 case LTTNG_ADD_CONTEXT
:
3184 ret
= cmd_add_context(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3185 cmd_ctx
->lsm
->u
.context
.channel_name
,
3186 &cmd_ctx
->lsm
->u
.context
.ctx
, kernel_poll_pipe
[1]);
3189 case LTTNG_DISABLE_CHANNEL
:
3191 ret
= cmd_disable_channel(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3192 cmd_ctx
->lsm
->u
.disable
.channel_name
);
3195 case LTTNG_DISABLE_EVENT
:
3199 * FIXME: handle filter; for now we just receive the filter's
3200 * bytecode along with the filter expression which are sent by
3201 * liblttng-ctl and discard them.
3203 * This fixes an issue where the client may block while sending
3204 * the filter payload and encounter an error because the session
3205 * daemon closes the socket without ever handling this data.
3207 size_t count
= cmd_ctx
->lsm
->u
.disable
.expression_len
+
3208 cmd_ctx
->lsm
->u
.disable
.bytecode_len
;
3211 char data
[LTTNG_FILTER_MAX_LEN
];
3213 DBG("Discarding disable event command payload of size %zu", count
);
3215 ret
= lttcomm_recv_unix_sock(sock
, data
,
3216 count
> sizeof(data
) ? sizeof(data
) : count
);
3221 count
-= (size_t) ret
;
3224 /* FIXME: passing packed structure to non-packed pointer */
3225 ret
= cmd_disable_event(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3226 cmd_ctx
->lsm
->u
.disable
.channel_name
,
3227 &cmd_ctx
->lsm
->u
.disable
.event
);
3230 case LTTNG_ENABLE_CHANNEL
:
3232 ret
= cmd_enable_channel(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3233 &cmd_ctx
->lsm
->u
.channel
.chan
, kernel_poll_pipe
[1]);
3236 case LTTNG_ENABLE_EVENT
:
3238 struct lttng_event_exclusion
*exclusion
= NULL
;
3239 struct lttng_filter_bytecode
*bytecode
= NULL
;
3240 char *filter_expression
= NULL
;
3242 /* Handle exclusion events and receive it from the client. */
3243 if (cmd_ctx
->lsm
->u
.enable
.exclusion_count
> 0) {
3244 size_t count
= cmd_ctx
->lsm
->u
.enable
.exclusion_count
;
3246 exclusion
= zmalloc(sizeof(struct lttng_event_exclusion
) +
3247 (count
* LTTNG_SYMBOL_NAME_LEN
));
3249 ret
= LTTNG_ERR_EXCLUSION_NOMEM
;
3253 DBG("Receiving var len exclusion event list from client ...");
3254 exclusion
->count
= count
;
3255 ret
= lttcomm_recv_unix_sock(sock
, exclusion
->names
,
3256 count
* LTTNG_SYMBOL_NAME_LEN
);
3258 DBG("Nothing recv() from client var len data... continuing");
3261 ret
= LTTNG_ERR_EXCLUSION_INVAL
;
3266 /* Get filter expression from client. */
3267 if (cmd_ctx
->lsm
->u
.enable
.expression_len
> 0) {
3268 size_t expression_len
=
3269 cmd_ctx
->lsm
->u
.enable
.expression_len
;
3271 if (expression_len
> LTTNG_FILTER_MAX_LEN
) {
3272 ret
= LTTNG_ERR_FILTER_INVAL
;
3277 filter_expression
= zmalloc(expression_len
);
3278 if (!filter_expression
) {
3280 ret
= LTTNG_ERR_FILTER_NOMEM
;
3284 /* Receive var. len. data */
3285 DBG("Receiving var len filter's expression from client ...");
3286 ret
= lttcomm_recv_unix_sock(sock
, filter_expression
,
3289 DBG("Nothing recv() from client car len data... continuing");
3291 free(filter_expression
);
3293 ret
= LTTNG_ERR_FILTER_INVAL
;
3298 /* Handle filter and get bytecode from client. */
3299 if (cmd_ctx
->lsm
->u
.enable
.bytecode_len
> 0) {
3300 size_t bytecode_len
= cmd_ctx
->lsm
->u
.enable
.bytecode_len
;
3302 if (bytecode_len
> LTTNG_FILTER_MAX_LEN
) {
3303 ret
= LTTNG_ERR_FILTER_INVAL
;
3304 free(filter_expression
);
3309 bytecode
= zmalloc(bytecode_len
);
3311 free(filter_expression
);
3313 ret
= LTTNG_ERR_FILTER_NOMEM
;
3317 /* Receive var. len. data */
3318 DBG("Receiving var len filter's bytecode from client ...");
3319 ret
= lttcomm_recv_unix_sock(sock
, bytecode
, bytecode_len
);
3321 DBG("Nothing recv() from client car len data... continuing");
3323 free(filter_expression
);
3326 ret
= LTTNG_ERR_FILTER_INVAL
;
3330 if ((bytecode
->len
+ sizeof(*bytecode
)) != bytecode_len
) {
3331 free(filter_expression
);
3334 ret
= LTTNG_ERR_FILTER_INVAL
;
3339 ret
= cmd_enable_event(cmd_ctx
->session
, &cmd_ctx
->lsm
->domain
,
3340 cmd_ctx
->lsm
->u
.enable
.channel_name
,
3341 &cmd_ctx
->lsm
->u
.enable
.event
,
3342 filter_expression
, bytecode
, exclusion
,
3343 kernel_poll_pipe
[1]);
3346 case LTTNG_LIST_TRACEPOINTS
:
3348 struct lttng_event
*events
;
3351 session_lock_list();
3352 nb_events
= cmd_list_tracepoints(cmd_ctx
->lsm
->domain
.type
, &events
);
3353 session_unlock_list();
3354 if (nb_events
< 0) {
3355 /* Return value is a negative lttng_error_code. */
3361 * Setup lttng message with payload size set to the event list size in
3362 * bytes and then copy list into the llm payload.
3364 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3370 /* Copy event list into message payload */
3371 memcpy(cmd_ctx
->llm
->payload
, events
,
3372 sizeof(struct lttng_event
) * nb_events
);
3379 case LTTNG_LIST_TRACEPOINT_FIELDS
:
3381 struct lttng_event_field
*fields
;
3384 session_lock_list();
3385 nb_fields
= cmd_list_tracepoint_fields(cmd_ctx
->lsm
->domain
.type
,
3387 session_unlock_list();
3388 if (nb_fields
< 0) {
3389 /* Return value is a negative lttng_error_code. */
3395 * Setup lttng message with payload size set to the event list size in
3396 * bytes and then copy list into the llm payload.
3398 ret
= setup_lttng_msg(cmd_ctx
,
3399 sizeof(struct lttng_event_field
) * nb_fields
);
3405 /* Copy event list into message payload */
3406 memcpy(cmd_ctx
->llm
->payload
, fields
,
3407 sizeof(struct lttng_event_field
) * nb_fields
);
3414 case LTTNG_LIST_SYSCALLS
:
3416 struct lttng_event
*events
;
3419 nb_events
= cmd_list_syscalls(&events
);
3420 if (nb_events
< 0) {
3421 /* Return value is a negative lttng_error_code. */
3427 * Setup lttng message with payload size set to the event list size in
3428 * bytes and then copy list into the llm payload.
3430 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_event
) * nb_events
);
3436 /* Copy event list into message payload */
3437 memcpy(cmd_ctx
->llm
->payload
, events
,
3438 sizeof(struct lttng_event
) * nb_events
);
3445 case LTTNG_SET_CONSUMER_URI
:
3448 struct lttng_uri
*uris
;
3450 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3451 len
= nb_uri
* sizeof(struct lttng_uri
);
3454 ret
= LTTNG_ERR_INVALID
;
3458 uris
= zmalloc(len
);
3460 ret
= LTTNG_ERR_FATAL
;
3464 /* Receive variable len data */
3465 DBG("Receiving %zu URI(s) from client ...", nb_uri
);
3466 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3468 DBG("No URIs received from client... continuing");
3470 ret
= LTTNG_ERR_SESSION_FAIL
;
3475 ret
= cmd_set_consumer_uri(cmd_ctx
->session
, nb_uri
, uris
);
3477 if (ret
!= LTTNG_OK
) {
3484 case LTTNG_START_TRACE
:
3486 ret
= cmd_start_trace(cmd_ctx
->session
);
3489 case LTTNG_STOP_TRACE
:
3491 ret
= cmd_stop_trace(cmd_ctx
->session
);
3494 case LTTNG_CREATE_SESSION
:
3497 struct lttng_uri
*uris
= NULL
;
3499 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3500 len
= nb_uri
* sizeof(struct lttng_uri
);
3503 uris
= zmalloc(len
);
3505 ret
= LTTNG_ERR_FATAL
;
3509 /* Receive variable len data */
3510 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3511 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3513 DBG("No URIs received from client... continuing");
3515 ret
= LTTNG_ERR_SESSION_FAIL
;
3520 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3521 DBG("Creating session with ONE network URI is a bad call");
3522 ret
= LTTNG_ERR_SESSION_FAIL
;
3528 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
, nb_uri
,
3529 &cmd_ctx
->creds
, 0);
3535 case LTTNG_DESTROY_SESSION
:
3537 ret
= cmd_destroy_session(cmd_ctx
->session
, kernel_poll_pipe
[1]);
3539 /* Set session to NULL so we do not unlock it after free. */
3540 cmd_ctx
->session
= NULL
;
3543 case LTTNG_LIST_DOMAINS
:
3546 struct lttng_domain
*domains
;
3548 nb_dom
= cmd_list_domains(cmd_ctx
->session
, &domains
);
3550 /* Return value is a negative lttng_error_code. */
3555 ret
= setup_lttng_msg(cmd_ctx
, nb_dom
* sizeof(struct lttng_domain
));
3561 /* Copy event list into message payload */
3562 memcpy(cmd_ctx
->llm
->payload
, domains
,
3563 nb_dom
* sizeof(struct lttng_domain
));
3570 case LTTNG_LIST_CHANNELS
:
3573 struct lttng_channel
*channels
= NULL
;
3575 nb_chan
= cmd_list_channels(cmd_ctx
->lsm
->domain
.type
,
3576 cmd_ctx
->session
, &channels
);
3578 /* Return value is a negative lttng_error_code. */
3583 ret
= setup_lttng_msg(cmd_ctx
, nb_chan
* sizeof(struct lttng_channel
));
3589 /* Copy event list into message payload */
3590 memcpy(cmd_ctx
->llm
->payload
, channels
,
3591 nb_chan
* sizeof(struct lttng_channel
));
3598 case LTTNG_LIST_EVENTS
:
3601 struct lttng_event
*events
= NULL
;
3603 nb_event
= cmd_list_events(cmd_ctx
->lsm
->domain
.type
, cmd_ctx
->session
,
3604 cmd_ctx
->lsm
->u
.list
.channel_name
, &events
);
3606 /* Return value is a negative lttng_error_code. */
3611 ret
= setup_lttng_msg(cmd_ctx
, nb_event
* sizeof(struct lttng_event
));
3617 /* Copy event list into message payload */
3618 memcpy(cmd_ctx
->llm
->payload
, events
,
3619 nb_event
* sizeof(struct lttng_event
));
3626 case LTTNG_LIST_SESSIONS
:
3628 unsigned int nr_sessions
;
3630 session_lock_list();
3631 nr_sessions
= lttng_sessions_count(
3632 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3633 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3635 ret
= setup_lttng_msg(cmd_ctx
, sizeof(struct lttng_session
) * nr_sessions
);
3637 session_unlock_list();
3641 /* Filled the session array */
3642 cmd_list_lttng_sessions((struct lttng_session
*)(cmd_ctx
->llm
->payload
),
3643 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx
->creds
),
3644 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx
->creds
));
3646 session_unlock_list();
3651 case LTTNG_CALIBRATE
:
3653 ret
= cmd_calibrate(cmd_ctx
->lsm
->domain
.type
,
3654 &cmd_ctx
->lsm
->u
.calibrate
);
3657 case LTTNG_REGISTER_CONSUMER
:
3659 struct consumer_data
*cdata
;
3661 switch (cmd_ctx
->lsm
->domain
.type
) {
3662 case LTTNG_DOMAIN_KERNEL
:
3663 cdata
= &kconsumer_data
;
3666 ret
= LTTNG_ERR_UND
;
3670 ret
= cmd_register_consumer(cmd_ctx
->session
, cmd_ctx
->lsm
->domain
.type
,
3671 cmd_ctx
->lsm
->u
.reg
.path
, cdata
);
3674 case LTTNG_DATA_PENDING
:
3676 ret
= cmd_data_pending(cmd_ctx
->session
);
3679 case LTTNG_SNAPSHOT_ADD_OUTPUT
:
3681 struct lttcomm_lttng_output_id reply
;
3683 ret
= cmd_snapshot_add_output(cmd_ctx
->session
,
3684 &cmd_ctx
->lsm
->u
.snapshot_output
.output
, &reply
.id
);
3685 if (ret
!= LTTNG_OK
) {
3689 ret
= setup_lttng_msg(cmd_ctx
, sizeof(reply
));
3694 /* Copy output list into message payload */
3695 memcpy(cmd_ctx
->llm
->payload
, &reply
, sizeof(reply
));
3699 case LTTNG_SNAPSHOT_DEL_OUTPUT
:
3701 ret
= cmd_snapshot_del_output(cmd_ctx
->session
,
3702 &cmd_ctx
->lsm
->u
.snapshot_output
.output
);
3705 case LTTNG_SNAPSHOT_LIST_OUTPUT
:
3708 struct lttng_snapshot_output
*outputs
= NULL
;
3710 nb_output
= cmd_snapshot_list_outputs(cmd_ctx
->session
, &outputs
);
3711 if (nb_output
< 0) {
3716 ret
= setup_lttng_msg(cmd_ctx
,
3717 nb_output
* sizeof(struct lttng_snapshot_output
));
3724 /* Copy output list into message payload */
3725 memcpy(cmd_ctx
->llm
->payload
, outputs
,
3726 nb_output
* sizeof(struct lttng_snapshot_output
));
3733 case LTTNG_SNAPSHOT_RECORD
:
3735 ret
= cmd_snapshot_record(cmd_ctx
->session
,
3736 &cmd_ctx
->lsm
->u
.snapshot_record
.output
,
3737 cmd_ctx
->lsm
->u
.snapshot_record
.wait
);
3740 case LTTNG_CREATE_SESSION_SNAPSHOT
:
3743 struct lttng_uri
*uris
= NULL
;
3745 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3746 len
= nb_uri
* sizeof(struct lttng_uri
);
3749 uris
= zmalloc(len
);
3751 ret
= LTTNG_ERR_FATAL
;
3755 /* Receive variable len data */
3756 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3757 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3759 DBG("No URIs received from client... continuing");
3761 ret
= LTTNG_ERR_SESSION_FAIL
;
3766 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3767 DBG("Creating session with ONE network URI is a bad call");
3768 ret
= LTTNG_ERR_SESSION_FAIL
;
3774 ret
= cmd_create_session_snapshot(cmd_ctx
->lsm
->session
.name
, uris
,
3775 nb_uri
, &cmd_ctx
->creds
);
3779 case LTTNG_CREATE_SESSION_LIVE
:
3782 struct lttng_uri
*uris
= NULL
;
3784 nb_uri
= cmd_ctx
->lsm
->u
.uri
.size
;
3785 len
= nb_uri
* sizeof(struct lttng_uri
);
3788 uris
= zmalloc(len
);
3790 ret
= LTTNG_ERR_FATAL
;
3794 /* Receive variable len data */
3795 DBG("Waiting for %zu URIs from client ...", nb_uri
);
3796 ret
= lttcomm_recv_unix_sock(sock
, uris
, len
);
3798 DBG("No URIs received from client... continuing");
3800 ret
= LTTNG_ERR_SESSION_FAIL
;
3805 if (nb_uri
== 1 && uris
[0].dtype
!= LTTNG_DST_PATH
) {
3806 DBG("Creating session with ONE network URI is a bad call");
3807 ret
= LTTNG_ERR_SESSION_FAIL
;
3813 ret
= cmd_create_session_uri(cmd_ctx
->lsm
->session
.name
, uris
,
3814 nb_uri
, &cmd_ctx
->creds
, cmd_ctx
->lsm
->u
.session_live
.timer_interval
);
3818 case LTTNG_SAVE_SESSION
:
3820 ret
= cmd_save_sessions(&cmd_ctx
->lsm
->u
.save_session
.attr
,
3825 ret
= LTTNG_ERR_UND
;
3830 if (cmd_ctx
->llm
== NULL
) {
3831 DBG("Missing llm structure. Allocating one.");
3832 if (setup_lttng_msg(cmd_ctx
, 0) < 0) {
3836 /* Set return code */
3837 cmd_ctx
->llm
->ret_code
= ret
;
3839 if (cmd_ctx
->session
) {
3840 session_unlock(cmd_ctx
->session
);
3842 if (need_tracing_session
) {
3843 session_unlock_list();
3850 * Thread managing health check socket.
3852 static void *thread_manage_health(void *data
)
3854 int sock
= -1, new_sock
= -1, ret
, i
, pollfd
, err
= -1;
3855 uint32_t revents
, nb_fd
;
3856 struct lttng_poll_event events
;
3857 struct health_comm_msg msg
;
3858 struct health_comm_reply reply
;
3860 DBG("[thread] Manage health check started");
3862 rcu_register_thread();
3864 /* We might hit an error path before this is created. */
3865 lttng_poll_init(&events
);
3867 /* Create unix socket */
3868 sock
= lttcomm_create_unix_sock(health_unix_sock_path
);
3870 ERR("Unable to create health check Unix socket");
3876 /* lttng health client socket path permissions */
3877 ret
= chown(health_unix_sock_path
, 0,
3878 utils_get_group_id(tracing_group_name
));
3880 ERR("Unable to set group on %s", health_unix_sock_path
);
3886 ret
= chmod(health_unix_sock_path
,
3887 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
3889 ERR("Unable to set permissions on %s", health_unix_sock_path
);
3897 * Set the CLOEXEC flag. Return code is useless because either way, the
3900 (void) utils_set_fd_cloexec(sock
);
3902 ret
= lttcomm_listen_unix_sock(sock
);
3908 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3909 * more will be added to this poll set.
3911 ret
= sessiond_set_thread_pollset(&events
, 2);
3916 /* Add the application registration socket */
3917 ret
= lttng_poll_add(&events
, sock
, LPOLLIN
| LPOLLPRI
);
3922 sessiond_notify_ready();
3925 DBG("Health check ready");
3927 /* Inifinite blocking call, waiting for transmission */
3929 ret
= lttng_poll_wait(&events
, -1);
3932 * Restart interrupted system call.
3934 if (errno
== EINTR
) {
3942 for (i
= 0; i
< nb_fd
; i
++) {
3943 /* Fetch once the poll data */
3944 revents
= LTTNG_POLL_GETEV(&events
, i
);
3945 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
3948 /* No activity for this FD (poll implementation). */
3952 /* Thread quit pipe has been closed. Killing thread. */
3953 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
3959 /* Event on the registration socket */
3960 if (pollfd
== sock
) {
3961 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
3962 ERR("Health socket poll error");
3968 new_sock
= lttcomm_accept_unix_sock(sock
);
3974 * Set the CLOEXEC flag. Return code is useless because either way, the
3977 (void) utils_set_fd_cloexec(new_sock
);
3979 DBG("Receiving data from client for health...");
3980 ret
= lttcomm_recv_unix_sock(new_sock
, (void *)&msg
, sizeof(msg
));
3982 DBG("Nothing recv() from client... continuing");
3983 ret
= close(new_sock
);
3991 rcu_thread_online();
3993 memset(&reply
, 0, sizeof(reply
));
3994 for (i
= 0; i
< NR_HEALTH_SESSIOND_TYPES
; i
++) {
3996 * health_check_state returns 0 if health is
3999 if (!health_check_state(health_sessiond
, i
)) {
4000 reply
.ret_code
|= 1ULL << i
;
4004 DBG2("Health check return value %" PRIx64
, reply
.ret_code
);
4006 ret
= send_unix_sock(new_sock
, (void *) &reply
, sizeof(reply
));
4008 ERR("Failed to send health data back to client");
4011 /* End of transmission */
4012 ret
= close(new_sock
);
4022 ERR("Health error occurred in %s", __func__
);
4024 DBG("Health check thread dying");
4025 unlink(health_unix_sock_path
);
4033 lttng_poll_clean(&events
);
4035 rcu_unregister_thread();
4040 * This thread manage all clients request using the unix client socket for
4043 static void *thread_manage_clients(void *data
)
4045 int sock
= -1, ret
, i
, pollfd
, err
= -1;
4047 uint32_t revents
, nb_fd
;
4048 struct command_ctx
*cmd_ctx
= NULL
;
4049 struct lttng_poll_event events
;
4051 DBG("[thread] Manage client started");
4053 rcu_register_thread();
4055 health_register(health_sessiond
, HEALTH_SESSIOND_TYPE_CMD
);
4057 health_code_update();
4059 ret
= lttcomm_listen_unix_sock(client_sock
);
4065 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4066 * more will be added to this poll set.
4068 ret
= sessiond_set_thread_pollset(&events
, 2);
4070 goto error_create_poll
;
4073 /* Add the application registration socket */
4074 ret
= lttng_poll_add(&events
, client_sock
, LPOLLIN
| LPOLLPRI
);
4079 sessiond_notify_ready();
4080 ret
= sem_post(&load_info
->message_thread_ready
);
4082 PERROR("sem_post message_thread_ready");
4086 /* This testpoint is after we signal readiness to the parent. */
4087 if (testpoint(sessiond_thread_manage_clients
)) {
4091 if (testpoint(sessiond_thread_manage_clients_before_loop
)) {
4095 health_code_update();
4098 DBG("Accepting client command ...");
4100 /* Inifinite blocking call, waiting for transmission */
4102 health_poll_entry();
4103 ret
= lttng_poll_wait(&events
, -1);
4107 * Restart interrupted system call.
4109 if (errno
== EINTR
) {
4117 for (i
= 0; i
< nb_fd
; i
++) {
4118 /* Fetch once the poll data */
4119 revents
= LTTNG_POLL_GETEV(&events
, i
);
4120 pollfd
= LTTNG_POLL_GETFD(&events
, i
);
4122 health_code_update();
4125 /* No activity for this FD (poll implementation). */
4129 /* Thread quit pipe has been closed. Killing thread. */
4130 ret
= sessiond_check_thread_quit_pipe(pollfd
, revents
);
4136 /* Event on the registration socket */
4137 if (pollfd
== client_sock
) {
4138 if (revents
& (LPOLLERR
| LPOLLHUP
| LPOLLRDHUP
)) {
4139 ERR("Client socket poll error");
4145 DBG("Wait for client response");
4147 health_code_update();
4149 sock
= lttcomm_accept_unix_sock(client_sock
);
4155 * Set the CLOEXEC flag. Return code is useless because either way, the
4158 (void) utils_set_fd_cloexec(sock
);
4160 /* Set socket option for credentials retrieval */
4161 ret
= lttcomm_setsockopt_creds_unix_sock(sock
);
4166 /* Allocate context command to process the client request */
4167 cmd_ctx
= zmalloc(sizeof(struct command_ctx
));
4168 if (cmd_ctx
== NULL
) {
4169 PERROR("zmalloc cmd_ctx");
4173 /* Allocate data buffer for reception */
4174 cmd_ctx
->lsm
= zmalloc(sizeof(struct lttcomm_session_msg
));
4175 if (cmd_ctx
->lsm
== NULL
) {
4176 PERROR("zmalloc cmd_ctx->lsm");
4180 cmd_ctx
->llm
= NULL
;
4181 cmd_ctx
->session
= NULL
;
4183 health_code_update();
4186 * Data is received from the lttng client. The struct
4187 * lttcomm_session_msg (lsm) contains the command and data request of
4190 DBG("Receiving data from client ...");
4191 ret
= lttcomm_recv_creds_unix_sock(sock
, cmd_ctx
->lsm
,
4192 sizeof(struct lttcomm_session_msg
), &cmd_ctx
->creds
);
4194 DBG("Nothing recv() from client... continuing");
4200 clean_command_ctx(&cmd_ctx
);
4204 health_code_update();
4206 // TODO: Validate cmd_ctx including sanity check for
4207 // security purpose.
4209 rcu_thread_online();
4211 * This function dispatch the work to the kernel or userspace tracer
4212 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4213 * informations for the client. The command context struct contains
4214 * everything this function may needs.
4216 ret
= process_client_msg(cmd_ctx
, sock
, &sock_error
);
4217 rcu_thread_offline();
4225 * TODO: Inform client somehow of the fatal error. At
4226 * this point, ret < 0 means that a zmalloc failed
4227 * (ENOMEM). Error detected but still accept
4228 * command, unless a socket error has been
4231 clean_command_ctx(&cmd_ctx
);
4235 health_code_update();
4237 DBG("Sending response (size: %d, retcode: %s)",
4238 cmd_ctx
->lttng_msg_size
,
4239 lttng_strerror(-cmd_ctx
->llm
->ret_code
));
4240 ret
= send_unix_sock(sock
, cmd_ctx
->llm
, cmd_ctx
->lttng_msg_size
);
4242 ERR("Failed to send data back to client");
4245 /* End of transmission */
4252 clean_command_ctx(&cmd_ctx
);
4254 health_code_update();
4266 lttng_poll_clean(&events
);
4267 clean_command_ctx(&cmd_ctx
);
4271 unlink(client_unix_sock_path
);
4272 if (client_sock
>= 0) {
4273 ret
= close(client_sock
);
4281 ERR("Health error occurred in %s", __func__
);
4284 health_unregister(health_sessiond
);
4286 DBG("Client thread dying");
4288 rcu_unregister_thread();
4294 * usage function on stderr
4296 static void usage(void)
4298 fprintf(stderr
, "Usage: %s OPTIONS\n\nOptions:\n", progname
);
4299 fprintf(stderr
, " -h, --help Display this usage.\n");
4300 fprintf(stderr
, " -c, --client-sock PATH Specify path for the client unix socket\n");
4301 fprintf(stderr
, " -a, --apps-sock PATH Specify path for apps unix socket\n");
4302 fprintf(stderr
, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
4303 fprintf(stderr
, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
4304 fprintf(stderr
, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
4305 fprintf(stderr
, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
4306 fprintf(stderr
, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
4307 fprintf(stderr
, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
4308 fprintf(stderr
, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
4309 fprintf(stderr
, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
4310 fprintf(stderr
, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4311 fprintf(stderr
, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
4312 fprintf(stderr
, " -d, --daemonize Start as a daemon.\n");
4313 fprintf(stderr
, " -b, --background Start as a daemon, keeping console open.\n");
4314 fprintf(stderr
, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4315 fprintf(stderr
, " -V, --version Show version number.\n");
4316 fprintf(stderr
, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
4317 fprintf(stderr
, " -q, --quiet No output at all.\n");
4318 fprintf(stderr
, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
4319 fprintf(stderr
, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
4320 fprintf(stderr
, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4321 fprintf(stderr
, " --no-kernel Disable kernel tracer\n");
4322 fprintf(stderr
, " --agent-tcp-port Agent registration TCP port\n");
4323 fprintf(stderr
, " -f --config PATH Load daemon configuration file\n");
4324 fprintf(stderr
, " -l --load PATH Load session configuration\n");
4325 fprintf(stderr
, " --kmod-probes Specify kernel module probes to load\n");
4326 fprintf(stderr
, " --extra-kmod-probes Specify extra kernel module probes to load\n");
4330 * Take an option from the getopt output and set it in the right variable to be
4333 * Return 0 on success else a negative value.
4335 static int set_option(int opt
, const char *arg
, const char *optname
)
4339 if (arg
&& arg
[0] == '\0') {
4341 * This only happens if the value is read from daemon config
4342 * file. This means the option requires an argument and the
4343 * configuration file contains a line such as:
4352 fprintf(stderr
, "option %s", optname
);
4354 fprintf(stderr
, " with arg %s\n", arg
);
4358 snprintf(client_unix_sock_path
, PATH_MAX
, "%s", arg
);
4361 snprintf(apps_unix_sock_path
, PATH_MAX
, "%s", arg
);
4371 * If the override option is set, the pointer points to a
4372 * *non* const thus freeing it even though the variable type is
4375 if (tracing_group_name_override
) {
4376 free((void *) tracing_group_name
);
4378 tracing_group_name
= strdup(arg
);
4379 if (!tracing_group_name
) {
4383 tracing_group_name_override
= 1;
4389 fprintf(stdout
, "%s\n", VERSION
);
4395 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
, "%s", arg
);
4398 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", arg
);
4401 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
, "%s", arg
);
4404 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", arg
);
4407 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
, "%s", arg
);
4410 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
, "%s", arg
);
4416 lttng_opt_quiet
= 1;
4419 /* Verbose level can increase using multiple -v */
4421 /* Value obtained from config file */
4422 lttng_opt_verbose
= config_parse_value(arg
);
4424 /* -v used on command line */
4425 lttng_opt_verbose
++;
4427 /* Clamp value to [0, 3] */
4428 lttng_opt_verbose
= lttng_opt_verbose
< 0 ? 0 :
4429 (lttng_opt_verbose
<= 3 ? lttng_opt_verbose
: 3);
4433 opt_verbose_consumer
= config_parse_value(arg
);
4435 opt_verbose_consumer
+= 1;
4439 if (consumerd32_bin_override
) {
4440 free((void *) consumerd32_bin
);
4442 consumerd32_bin
= strdup(arg
);
4443 if (!consumerd32_bin
) {
4447 consumerd32_bin_override
= 1;
4450 if (consumerd32_libdir_override
) {
4451 free((void *) consumerd32_libdir
);
4453 consumerd32_libdir
= strdup(arg
);
4454 if (!consumerd32_libdir
) {
4458 consumerd32_libdir_override
= 1;
4461 if (consumerd64_bin_override
) {
4462 free((void *) consumerd64_bin
);
4464 consumerd64_bin
= strdup(arg
);
4465 if (!consumerd64_bin
) {
4469 consumerd64_bin_override
= 1;
4472 if (consumerd64_libdir_override
) {
4473 free((void *) consumerd64_libdir
);
4475 consumerd64_libdir
= strdup(arg
);
4476 if (!consumerd64_libdir
) {
4480 consumerd64_libdir_override
= 1;
4484 opt_pidfile
= strdup(arg
);
4490 case 'J': /* Agent TCP port. */
4495 v
= strtoul(arg
, NULL
, 0);
4496 if (errno
!= 0 || !isdigit(arg
[0])) {
4497 ERR("Wrong value in --agent-tcp-port parameter: %s", arg
);
4500 if (v
== 0 || v
>= 65535) {
4501 ERR("Port overflow in --agent-tcp-port parameter: %s", arg
);
4504 agent_tcp_port
= (uint32_t) v
;
4505 DBG3("Agent TCP port set to non default: %u", agent_tcp_port
);
4509 free(opt_load_session_path
);
4510 opt_load_session_path
= strdup(arg
);
4511 if (!opt_load_session_path
) {
4516 case 'P': /* probe modules list */
4517 free(kmod_probes_list
);
4518 kmod_probes_list
= strdup(arg
);
4519 if (!kmod_probes_list
) {
4525 free(kmod_extra_probes_list
);
4526 kmod_extra_probes_list
= strdup(arg
);
4527 if (!kmod_extra_probes_list
) {
4533 /* This is handled in set_options() thus silent break. */
4536 /* Unknown option or other error.
4537 * Error is printed by getopt, just return */
4542 if (ret
== -EINVAL
) {
4543 const char *opt_name
= "unknown";
4546 for (i
= 0; i
< sizeof(long_options
) / sizeof(struct option
);
4548 if (opt
== long_options
[i
].val
) {
4549 opt_name
= long_options
[i
].name
;
4554 WARN("Invalid argument provided for option \"%s\", using default value.",
4562 * config_entry_handler_cb used to handle options read from a config file.
4563 * See config_entry_handler_cb comment in common/config/config.h for the
4564 * return value conventions.
4566 static int config_entry_handler(const struct config_entry
*entry
, void *unused
)
4570 if (!entry
|| !entry
->name
|| !entry
->value
) {
4575 /* Check if the option is to be ignored */
4576 for (i
= 0; i
< sizeof(config_ignore_options
) / sizeof(char *); i
++) {
4577 if (!strcmp(entry
->name
, config_ignore_options
[i
])) {
4582 for (i
= 0; i
< (sizeof(long_options
) / sizeof(struct option
)) - 1;
4585 /* Ignore if not fully matched. */
4586 if (strcmp(entry
->name
, long_options
[i
].name
)) {
4591 * If the option takes no argument on the command line, we have to
4592 * check if the value is "true". We support non-zero numeric values,
4595 if (!long_options
[i
].has_arg
) {
4596 ret
= config_parse_value(entry
->value
);
4599 WARN("Invalid configuration value \"%s\" for option %s",
4600 entry
->value
, entry
->name
);
4602 /* False, skip boolean config option. */
4607 ret
= set_option(long_options
[i
].val
, entry
->value
, entry
->name
);
4611 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry
->name
);
4618 * daemon configuration loading and argument parsing
4620 static int set_options(int argc
, char **argv
)
4622 int ret
= 0, c
= 0, option_index
= 0;
4623 int orig_optopt
= optopt
, orig_optind
= optind
;
4625 const char *config_path
= NULL
;
4627 optstring
= utils_generate_optstring(long_options
,
4628 sizeof(long_options
) / sizeof(struct option
));
4634 /* Check for the --config option */
4635 while ((c
= getopt_long(argc
, argv
, optstring
, long_options
,
4636 &option_index
)) != -1) {
4640 } else if (c
!= 'f') {
4641 /* if not equal to --config option. */
4645 config_path
= utils_expand_path(optarg
);
4647 ERR("Failed to resolve path: %s", optarg
);
4651 ret
= config_get_section_entries(config_path
, config_section_name
,
4652 config_entry_handler
, NULL
);
4655 ERR("Invalid configuration option at line %i", ret
);
4661 /* Reset getopt's global state */
4662 optopt
= orig_optopt
;
4663 optind
= orig_optind
;
4665 c
= getopt_long(argc
, argv
, optstring
, long_options
, &option_index
);
4670 ret
= set_option(c
, optarg
, long_options
[option_index
].name
);
4682 * Creates the two needed socket by the daemon.
4683 * apps_sock - The communication socket for all UST apps.
4684 * client_sock - The communication of the cli tool (lttng).
4686 static int init_daemon_socket(void)
4691 old_umask
= umask(0);
4693 /* Create client tool unix socket */
4694 client_sock
= lttcomm_create_unix_sock(client_unix_sock_path
);
4695 if (client_sock
< 0) {
4696 ERR("Create unix sock failed: %s", client_unix_sock_path
);
4701 /* Set the cloexec flag */
4702 ret
= utils_set_fd_cloexec(client_sock
);
4704 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4705 "Continuing but note that the consumer daemon will have a "
4706 "reference to this socket on exec()", client_sock
);
4709 /* File permission MUST be 660 */
4710 ret
= chmod(client_unix_sock_path
, S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4712 ERR("Set file permissions failed: %s", client_unix_sock_path
);
4717 /* Create the application unix socket */
4718 apps_sock
= lttcomm_create_unix_sock(apps_unix_sock_path
);
4719 if (apps_sock
< 0) {
4720 ERR("Create unix sock failed: %s", apps_unix_sock_path
);
4725 /* Set the cloexec flag */
4726 ret
= utils_set_fd_cloexec(apps_sock
);
4728 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4729 "Continuing but note that the consumer daemon will have a "
4730 "reference to this socket on exec()", apps_sock
);
4733 /* File permission MUST be 666 */
4734 ret
= chmod(apps_unix_sock_path
,
4735 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
4737 ERR("Set file permissions failed: %s", apps_unix_sock_path
);
4742 DBG3("Session daemon client socket %d and application socket %d created",
4743 client_sock
, apps_sock
);
4751 * Check if the global socket is available, and if a daemon is answering at the
4752 * other side. If yes, error is returned.
4754 static int check_existing_daemon(void)
4756 /* Is there anybody out there ? */
4757 if (lttng_session_daemon_alive()) {
4765 * Set the tracing group gid onto the client socket.
4767 * Race window between mkdir and chown is OK because we are going from more
4768 * permissive (root.root) to less permissive (root.tracing).
4770 static int set_permissions(char *rundir
)
4775 gid
= utils_get_group_id(tracing_group_name
);
4777 /* Set lttng run dir */
4778 ret
= chown(rundir
, 0, gid
);
4780 ERR("Unable to set group on %s", rundir
);
4785 * Ensure all applications and tracing group can search the run
4786 * dir. Allow everyone to read the directory, since it does not
4787 * buy us anything to hide its content.
4789 ret
= chmod(rundir
, S_IRWXU
| S_IRGRP
| S_IXGRP
| S_IROTH
| S_IXOTH
);
4791 ERR("Unable to set permissions on %s", rundir
);
4795 /* lttng client socket path */
4796 ret
= chown(client_unix_sock_path
, 0, gid
);
4798 ERR("Unable to set group on %s", client_unix_sock_path
);
4802 /* kconsumer error socket path */
4803 ret
= chown(kconsumer_data
.err_unix_sock_path
, 0, 0);
4805 ERR("Unable to set group on %s", kconsumer_data
.err_unix_sock_path
);
4809 /* 64-bit ustconsumer error socket path */
4810 ret
= chown(ustconsumer64_data
.err_unix_sock_path
, 0, 0);
4812 ERR("Unable to set group on %s", ustconsumer64_data
.err_unix_sock_path
);
4816 /* 32-bit ustconsumer compat32 error socket path */
4817 ret
= chown(ustconsumer32_data
.err_unix_sock_path
, 0, 0);
4819 ERR("Unable to set group on %s", ustconsumer32_data
.err_unix_sock_path
);
4823 DBG("All permissions are set");
4829 * Create the lttng run directory needed for all global sockets and pipe.
4831 static int create_lttng_rundir(const char *rundir
)
4835 DBG3("Creating LTTng run directory: %s", rundir
);
4837 ret
= mkdir(rundir
, S_IRWXU
);
4839 if (errno
!= EEXIST
) {
4840 ERR("Unable to create %s", rundir
);
4852 * Setup sockets and directory needed by the kconsumerd communication with the
4855 static int set_consumer_sockets(struct consumer_data
*consumer_data
,
4859 char path
[PATH_MAX
];
4861 switch (consumer_data
->type
) {
4862 case LTTNG_CONSUMER_KERNEL
:
4863 snprintf(path
, PATH_MAX
, DEFAULT_KCONSUMERD_PATH
, rundir
);
4865 case LTTNG_CONSUMER64_UST
:
4866 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD64_PATH
, rundir
);
4868 case LTTNG_CONSUMER32_UST
:
4869 snprintf(path
, PATH_MAX
, DEFAULT_USTCONSUMERD32_PATH
, rundir
);
4872 ERR("Consumer type unknown");
4877 DBG2("Creating consumer directory: %s", path
);
4879 ret
= mkdir(path
, S_IRWXU
| S_IRGRP
| S_IXGRP
);
4881 if (errno
!= EEXIST
) {
4883 ERR("Failed to create %s", path
);
4889 ret
= chown(path
, 0, utils_get_group_id(tracing_group_name
));
4891 ERR("Unable to set group on %s", path
);
4897 /* Create the kconsumerd error unix socket */
4898 consumer_data
->err_sock
=
4899 lttcomm_create_unix_sock(consumer_data
->err_unix_sock_path
);
4900 if (consumer_data
->err_sock
< 0) {
4901 ERR("Create unix sock failed: %s", consumer_data
->err_unix_sock_path
);
4907 * Set the CLOEXEC flag. Return code is useless because either way, the
4910 ret
= utils_set_fd_cloexec(consumer_data
->err_sock
);
4912 PERROR("utils_set_fd_cloexec");
4913 /* continue anyway */
4916 /* File permission MUST be 660 */
4917 ret
= chmod(consumer_data
->err_unix_sock_path
,
4918 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
4920 ERR("Set file permissions failed: %s", consumer_data
->err_unix_sock_path
);
4930 * Signal handler for the daemon
4932 * Simply stop all worker threads, leaving main() return gracefully after
4933 * joining all threads and calling cleanup().
4935 static void sighandler(int sig
)
4939 DBG("SIGPIPE caught");
4942 DBG("SIGINT caught");
4946 DBG("SIGTERM caught");
4950 CMM_STORE_SHARED(recv_child_signal
, 1);
4958 * Setup signal handler for :
4959 * SIGINT, SIGTERM, SIGPIPE
4961 static int set_signal_handler(void)
4964 struct sigaction sa
;
4967 if ((ret
= sigemptyset(&sigset
)) < 0) {
4968 PERROR("sigemptyset");
4972 sa
.sa_handler
= sighandler
;
4973 sa
.sa_mask
= sigset
;
4975 if ((ret
= sigaction(SIGTERM
, &sa
, NULL
)) < 0) {
4976 PERROR("sigaction");
4980 if ((ret
= sigaction(SIGINT
, &sa
, NULL
)) < 0) {
4981 PERROR("sigaction");
4985 if ((ret
= sigaction(SIGPIPE
, &sa
, NULL
)) < 0) {
4986 PERROR("sigaction");
4990 if ((ret
= sigaction(SIGUSR1
, &sa
, NULL
)) < 0) {
4991 PERROR("sigaction");
4995 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5001 * Set open files limit to unlimited. This daemon can open a large number of
5002 * file descriptors in order to consumer multiple kernel traces.
5004 static void set_ulimit(void)
5009 /* The kernel does not allowed an infinite limit for open files */
5010 lim
.rlim_cur
= 65535;
5011 lim
.rlim_max
= 65535;
5013 ret
= setrlimit(RLIMIT_NOFILE
, &lim
);
5015 PERROR("failed to set open files limit");
5020 * Write pidfile using the rundir and opt_pidfile.
5022 static void write_pidfile(void)
5025 char pidfile_path
[PATH_MAX
];
5030 strncpy(pidfile_path
, opt_pidfile
, sizeof(pidfile_path
));
5032 /* Build pidfile path from rundir and opt_pidfile. */
5033 ret
= snprintf(pidfile_path
, sizeof(pidfile_path
), "%s/"
5034 DEFAULT_LTTNG_SESSIOND_PIDFILE
, rundir
);
5036 PERROR("snprintf pidfile path");
5042 * Create pid file in rundir. Return value is of no importance. The
5043 * execution will continue even though we are not able to write the file.
5045 (void) utils_create_pid_file(getpid(), pidfile_path
);
5052 * Create lockfile using the rundir and return its fd.
5054 static int create_lockfile(void)
5057 char lockfile_path
[PATH_MAX
];
5059 ret
= generate_lock_file_path(lockfile_path
, sizeof(lockfile_path
));
5064 ret
= utils_create_lock_file(lockfile_path
);
5070 * Write agent TCP port using the rundir.
5072 static void write_agent_port(void)
5075 char path
[PATH_MAX
];
5079 ret
= snprintf(path
, sizeof(path
), "%s/"
5080 DEFAULT_LTTNG_SESSIOND_AGENTPORT_FILE
, rundir
);
5082 PERROR("snprintf agent port path");
5087 * Create TCP agent port file in rundir. Return value is of no importance.
5088 * The execution will continue even though we are not able to write the
5091 (void) utils_create_pid_file(agent_tcp_port
, path
);
5098 * Start the load session thread and dettach from it so the main thread can
5099 * continue. This does not return a value since whatever the outcome, the main
5100 * thread will continue.
5102 static void start_load_session_thread(void)
5106 /* Create session loading thread. */
5107 ret
= pthread_create(&load_session_thread
, NULL
, thread_load_session
,
5110 PERROR("pthread_create load_session_thread");
5114 ret
= pthread_detach(load_session_thread
);
5116 PERROR("pthread_detach load_session_thread");
5119 /* Everything went well so don't cleanup anything. */
5122 /* The cleanup() function will destroy the load_info data. */
5129 int main(int argc
, char **argv
)
5133 const char *home_path
, *env_app_timeout
;
5135 /* Initialize agent apps ht global variable */
5136 agent_apps_ht_by_sock
= NULL
;
5138 init_kernel_workarounds();
5140 rcu_register_thread();
5142 if ((ret
= set_signal_handler()) < 0) {
5146 setup_consumerd_path();
5148 page_size
= sysconf(_SC_PAGESIZE
);
5149 if (page_size
< 0) {
5150 PERROR("sysconf _SC_PAGESIZE");
5151 page_size
= LONG_MAX
;
5152 WARN("Fallback page size to %ld", page_size
);
5155 /* Parse arguments and load the daemon configuration file */
5157 if ((ret
= set_options(argc
, argv
)) < 0) {
5162 if (opt_daemon
|| opt_background
) {
5165 ret
= lttng_daemonize(&child_ppid
, &recv_child_signal
,
5172 * We are in the child. Make sure all other file descriptors are
5173 * closed, in case we are called with more opened file descriptors than
5174 * the standard ones.
5176 for (i
= 3; i
< sysconf(_SC_OPEN_MAX
); i
++) {
5181 /* Create thread quit pipe */
5182 if ((ret
= init_thread_quit_pipe()) < 0) {
5186 /* Check if daemon is UID = 0 */
5187 is_root
= !getuid();
5190 rundir
= strdup(DEFAULT_LTTNG_RUNDIR
);
5196 /* Create global run dir with root access */
5197 ret
= create_lttng_rundir(rundir
);
5202 if (strlen(apps_unix_sock_path
) == 0) {
5203 snprintf(apps_unix_sock_path
, PATH_MAX
,
5204 DEFAULT_GLOBAL_APPS_UNIX_SOCK
);
5207 if (strlen(client_unix_sock_path
) == 0) {
5208 snprintf(client_unix_sock_path
, PATH_MAX
,
5209 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK
);
5212 /* Set global SHM for ust */
5213 if (strlen(wait_shm_path
) == 0) {
5214 snprintf(wait_shm_path
, PATH_MAX
,
5215 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH
);
5218 if (strlen(health_unix_sock_path
) == 0) {
5219 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
5220 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK
);
5223 /* Setup kernel consumerd path */
5224 snprintf(kconsumer_data
.err_unix_sock_path
, PATH_MAX
,
5225 DEFAULT_KCONSUMERD_ERR_SOCK_PATH
, rundir
);
5226 snprintf(kconsumer_data
.cmd_unix_sock_path
, PATH_MAX
,
5227 DEFAULT_KCONSUMERD_CMD_SOCK_PATH
, rundir
);
5229 DBG2("Kernel consumer err path: %s",
5230 kconsumer_data
.err_unix_sock_path
);
5231 DBG2("Kernel consumer cmd path: %s",
5232 kconsumer_data
.cmd_unix_sock_path
);
5234 home_path
= utils_get_home_dir();
5235 if (home_path
== NULL
) {
5236 /* TODO: Add --socket PATH option */
5237 ERR("Can't get HOME directory for sockets creation.");
5243 * Create rundir from home path. This will create something like
5246 ret
= asprintf(&rundir
, DEFAULT_LTTNG_HOME_RUNDIR
, home_path
);
5252 ret
= create_lttng_rundir(rundir
);
5257 if (strlen(apps_unix_sock_path
) == 0) {
5258 snprintf(apps_unix_sock_path
, PATH_MAX
,
5259 DEFAULT_HOME_APPS_UNIX_SOCK
, home_path
);
5262 /* Set the cli tool unix socket path */
5263 if (strlen(client_unix_sock_path
) == 0) {
5264 snprintf(client_unix_sock_path
, PATH_MAX
,
5265 DEFAULT_HOME_CLIENT_UNIX_SOCK
, home_path
);
5268 /* Set global SHM for ust */
5269 if (strlen(wait_shm_path
) == 0) {
5270 snprintf(wait_shm_path
, PATH_MAX
,
5271 DEFAULT_HOME_APPS_WAIT_SHM_PATH
, getuid());
5274 /* Set health check Unix path */
5275 if (strlen(health_unix_sock_path
) == 0) {
5276 snprintf(health_unix_sock_path
, sizeof(health_unix_sock_path
),
5277 DEFAULT_HOME_HEALTH_UNIX_SOCK
, home_path
);
5281 lockfile_fd
= create_lockfile();
5282 if (lockfile_fd
< 0) {
5286 /* Set consumer initial state */
5287 kernel_consumerd_state
= CONSUMER_STOPPED
;
5288 ust_consumerd_state
= CONSUMER_STOPPED
;
5290 DBG("Client socket path %s", client_unix_sock_path
);
5291 DBG("Application socket path %s", apps_unix_sock_path
);
5292 DBG("Application wait path %s", wait_shm_path
);
5293 DBG("LTTng run directory path: %s", rundir
);
5295 /* 32 bits consumerd path setup */
5296 snprintf(ustconsumer32_data
.err_unix_sock_path
, PATH_MAX
,
5297 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH
, rundir
);
5298 snprintf(ustconsumer32_data
.cmd_unix_sock_path
, PATH_MAX
,
5299 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH
, rundir
);
5301 DBG2("UST consumer 32 bits err path: %s",
5302 ustconsumer32_data
.err_unix_sock_path
);
5303 DBG2("UST consumer 32 bits cmd path: %s",
5304 ustconsumer32_data
.cmd_unix_sock_path
);
5306 /* 64 bits consumerd path setup */
5307 snprintf(ustconsumer64_data
.err_unix_sock_path
, PATH_MAX
,
5308 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH
, rundir
);
5309 snprintf(ustconsumer64_data
.cmd_unix_sock_path
, PATH_MAX
,
5310 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH
, rundir
);
5312 DBG2("UST consumer 64 bits err path: %s",
5313 ustconsumer64_data
.err_unix_sock_path
);
5314 DBG2("UST consumer 64 bits cmd path: %s",
5315 ustconsumer64_data
.cmd_unix_sock_path
);
5318 * See if daemon already exist.
5320 if ((ret
= check_existing_daemon()) < 0) {
5321 ERR("Already running daemon.\n");
5323 * We do not goto exit because we must not cleanup()
5324 * because a daemon is already running.
5329 /* After this point, we can safely call cleanup() with "goto exit" */
5332 * Init UST app hash table. Alloc hash table before this point since
5333 * cleanup() can get called after that point.
5338 * Initialize agent app hash table. We allocate the hash table here
5339 * since cleanup() can get called after this point.
5341 if (agent_app_ht_alloc()) {
5342 ERR("Failed to allocate Agent app hash table");
5348 * These actions must be executed as root. We do that *after* setting up
5349 * the sockets path because we MUST make the check for another daemon using
5350 * those paths *before* trying to set the kernel consumer sockets and init
5354 ret
= set_consumer_sockets(&kconsumer_data
, rundir
);
5359 /* Setup kernel tracer */
5360 if (!opt_no_kernel
) {
5361 init_kernel_tracer();
5362 if (kernel_tracer_fd
>= 0) {
5363 ret
= syscall_init_table();
5365 ERR("Unable to populate syscall table. Syscall tracing"
5366 " won't work for this session daemon.");
5371 /* Set ulimit for open files */
5374 /* init lttng_fd tracking must be done after set_ulimit. */
5377 ret
= set_consumer_sockets(&ustconsumer64_data
, rundir
);
5382 ret
= set_consumer_sockets(&ustconsumer32_data
, rundir
);
5387 /* Setup the needed unix socket */
5388 if ((ret
= init_daemon_socket()) < 0) {
5392 /* Set credentials to socket */
5393 if (is_root
&& ((ret
= set_permissions(rundir
)) < 0)) {
5397 /* Get parent pid if -S, --sig-parent is specified. */
5398 if (opt_sig_parent
) {
5402 /* Setup the kernel pipe for waking up the kernel thread */
5403 if (is_root
&& !opt_no_kernel
) {
5404 if ((ret
= utils_create_pipe_cloexec(kernel_poll_pipe
)) < 0) {
5409 /* Setup the thread ht_cleanup communication pipe. */
5410 if (utils_create_pipe_cloexec(ht_cleanup_pipe
) < 0) {
5414 /* Setup the thread apps communication pipe. */
5415 if ((ret
= utils_create_pipe_cloexec(apps_cmd_pipe
)) < 0) {
5419 /* Setup the thread apps notify communication pipe. */
5420 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe
) < 0) {
5424 /* Initialize global buffer per UID and PID registry. */
5425 buffer_reg_init_uid_registry();
5426 buffer_reg_init_pid_registry();
5428 /* Init UST command queue. */
5429 cds_wfcq_init(&ust_cmd_queue
.head
, &ust_cmd_queue
.tail
);
5432 * Get session list pointer. This pointer MUST NOT be free(). This list is
5433 * statically declared in session.c
5435 session_list_ptr
= session_get_list();
5437 /* Set up max poll set size */
5438 lttng_poll_set_max_size();
5442 /* Check for the application socket timeout env variable. */
5443 env_app_timeout
= getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV
);
5444 if (env_app_timeout
) {
5445 app_socket_timeout
= atoi(env_app_timeout
);
5447 app_socket_timeout
= DEFAULT_APP_SOCKET_RW_TIMEOUT
;
5453 /* Initialize communication library */
5455 /* This is to get the TCP timeout value. */
5456 lttcomm_inet_init();
5458 if (load_session_init_data(&load_info
) < 0) {
5461 load_info
->path
= opt_load_session_path
;
5464 * Initialize the health check subsystem. This call should set the
5465 * appropriate time values.
5467 health_sessiond
= health_app_create(NR_HEALTH_SESSIOND_TYPES
);
5468 if (!health_sessiond
) {
5469 PERROR("health_app_create error");
5470 goto exit_health_sessiond_cleanup
;
5473 /* Create thread to clean up RCU hash tables */
5474 ret
= pthread_create(&ht_cleanup_thread
, NULL
,
5475 thread_ht_cleanup
, (void *) NULL
);
5477 PERROR("pthread_create ht_cleanup");
5478 goto exit_ht_cleanup
;
5481 /* Create health-check thread */
5482 ret
= pthread_create(&health_thread
, NULL
,
5483 thread_manage_health
, (void *) NULL
);
5485 PERROR("pthread_create health");
5489 /* Create thread to manage the client socket */
5490 ret
= pthread_create(&client_thread
, NULL
,
5491 thread_manage_clients
, (void *) NULL
);
5493 PERROR("pthread_create clients");
5497 /* Create thread to dispatch registration */
5498 ret
= pthread_create(&dispatch_thread
, NULL
,
5499 thread_dispatch_ust_registration
, (void *) NULL
);
5501 PERROR("pthread_create dispatch");
5505 /* Create thread to manage application registration. */
5506 ret
= pthread_create(®_apps_thread
, NULL
,
5507 thread_registration_apps
, (void *) NULL
);
5509 PERROR("pthread_create registration");
5513 /* Create thread to manage application socket */
5514 ret
= pthread_create(&apps_thread
, NULL
,
5515 thread_manage_apps
, (void *) NULL
);
5517 PERROR("pthread_create apps");
5521 /* Create thread to manage application notify socket */
5522 ret
= pthread_create(&apps_notify_thread
, NULL
,
5523 ust_thread_manage_notify
, (void *) NULL
);
5525 PERROR("pthread_create notify");
5526 goto exit_apps_notify
;
5529 /* Create agent registration thread. */
5530 ret
= pthread_create(&agent_reg_thread
, NULL
,
5531 agent_thread_manage_registration
, (void *) NULL
);
5533 PERROR("pthread_create agent");
5534 goto exit_agent_reg
;
5537 /* Don't start this thread if kernel tracing is not requested nor root */
5538 if (is_root
&& !opt_no_kernel
) {
5539 /* Create kernel thread to manage kernel event */
5540 ret
= pthread_create(&kernel_thread
, NULL
,
5541 thread_manage_kernel
, (void *) NULL
);
5543 PERROR("pthread_create kernel");
5548 /* Load possible session(s). */
5549 start_load_session_thread();
5551 if (is_root
&& !opt_no_kernel
) {
5552 ret
= pthread_join(kernel_thread
, &status
);
5554 PERROR("pthread_join");
5555 goto error
; /* join error, exit without cleanup */
5560 ret
= pthread_join(agent_reg_thread
, &status
);
5562 PERROR("pthread_join agent");
5563 goto error
; /* join error, exit without cleanup */
5567 ret
= pthread_join(apps_notify_thread
, &status
);
5569 PERROR("pthread_join apps notify");
5570 goto error
; /* join error, exit without cleanup */
5574 ret
= pthread_join(apps_thread
, &status
);
5576 PERROR("pthread_join apps");
5577 goto error
; /* join error, exit without cleanup */
5582 ret
= pthread_join(reg_apps_thread
, &status
);
5584 PERROR("pthread_join");
5585 goto error
; /* join error, exit without cleanup */
5589 ret
= pthread_join(dispatch_thread
, &status
);
5591 PERROR("pthread_join");
5592 goto error
; /* join error, exit without cleanup */
5596 ret
= pthread_join(client_thread
, &status
);
5598 PERROR("pthread_join");
5599 goto error
; /* join error, exit without cleanup */
5602 ret
= join_consumer_thread(&kconsumer_data
);
5604 PERROR("join_consumer");
5605 goto error
; /* join error, exit without cleanup */
5608 ret
= join_consumer_thread(&ustconsumer32_data
);
5610 PERROR("join_consumer ust32");
5611 goto error
; /* join error, exit without cleanup */
5614 ret
= join_consumer_thread(&ustconsumer64_data
);
5616 PERROR("join_consumer ust64");
5617 goto error
; /* join error, exit without cleanup */
5621 ret
= pthread_join(health_thread
, &status
);
5623 PERROR("pthread_join health thread");
5624 goto error
; /* join error, exit without cleanup */
5628 ret
= pthread_join(ht_cleanup_thread
, &status
);
5630 PERROR("pthread_join ht cleanup thread");
5631 goto error
; /* join error, exit without cleanup */
5634 health_app_destroy(health_sessiond
);
5635 exit_health_sessiond_cleanup
:
5638 * cleanup() is called when no other thread is running.
5640 rcu_thread_online();
5642 rcu_thread_offline();
5643 rcu_unregister_thread();