Rename LTTng index in CTF index
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <getopt.h>
21 #include <grp.h>
22 #include <limits.h>
23 #include <paths.h>
24 #include <pthread.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <inttypes.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/uatomic.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/futex.h>
46 #include <common/relayd/relayd.h>
47 #include <common/utils.h>
48
49 #include "lttng-sessiond.h"
50 #include "buffer-registry.h"
51 #include "channel.h"
52 #include "cmd.h"
53 #include "consumer.h"
54 #include "context.h"
55 #include "event.h"
56 #include "kernel.h"
57 #include "kernel-consumer.h"
58 #include "modprobe.h"
59 #include "shm.h"
60 #include "ust-ctl.h"
61 #include "ust-consumer.h"
62 #include "utils.h"
63 #include "fd-limit.h"
64 #include "health-sessiond.h"
65 #include "testpoint.h"
66 #include "ust-thread.h"
67 #include "jul-thread.h"
68
69 #define CONSUMERD_FILE "lttng-consumerd"
70
71 const char *progname;
72 static const char *tracing_group_name = DEFAULT_TRACING_GROUP;
73 static const char *opt_pidfile;
74 static int opt_sig_parent;
75 static int opt_verbose_consumer;
76 static int opt_daemon;
77 static int opt_no_kernel;
78 static int is_root; /* Set to 1 if the daemon is running as root */
79 static pid_t ppid; /* Parent PID for --sig-parent option */
80 static pid_t child_ppid; /* Internal parent PID use with daemonize. */
81 static char *rundir;
82
83 /* Set to 1 when a SIGUSR1 signal is received. */
84 static int recv_child_signal;
85
86 /*
87 * Consumer daemon specific control data. Every value not initialized here is
88 * set to 0 by the static definition.
89 */
90 static struct consumer_data kconsumer_data = {
91 .type = LTTNG_CONSUMER_KERNEL,
92 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
93 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
94 .err_sock = -1,
95 .cmd_sock = -1,
96 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
97 .lock = PTHREAD_MUTEX_INITIALIZER,
98 .cond = PTHREAD_COND_INITIALIZER,
99 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
100 };
101 static struct consumer_data ustconsumer64_data = {
102 .type = LTTNG_CONSUMER64_UST,
103 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
105 .err_sock = -1,
106 .cmd_sock = -1,
107 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
108 .lock = PTHREAD_MUTEX_INITIALIZER,
109 .cond = PTHREAD_COND_INITIALIZER,
110 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
111 };
112 static struct consumer_data ustconsumer32_data = {
113 .type = LTTNG_CONSUMER32_UST,
114 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
115 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
116 .err_sock = -1,
117 .cmd_sock = -1,
118 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
119 .lock = PTHREAD_MUTEX_INITIALIZER,
120 .cond = PTHREAD_COND_INITIALIZER,
121 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
122 };
123
124 /* Shared between threads */
125 static int dispatch_thread_exit;
126
127 /* Global application Unix socket path */
128 static char apps_unix_sock_path[PATH_MAX];
129 /* Global client Unix socket path */
130 static char client_unix_sock_path[PATH_MAX];
131 /* global wait shm path for UST */
132 static char wait_shm_path[PATH_MAX];
133 /* Global health check unix path */
134 static char health_unix_sock_path[PATH_MAX];
135
136 /* Sockets and FDs */
137 static int client_sock = -1;
138 static int apps_sock = -1;
139 int kernel_tracer_fd = -1;
140 static int kernel_poll_pipe[2] = { -1, -1 };
141
142 /*
143 * Quit pipe for all threads. This permits a single cancellation point
144 * for all threads when receiving an event on the pipe.
145 */
146 static int thread_quit_pipe[2] = { -1, -1 };
147
148 /*
149 * This pipe is used to inform the thread managing application communication
150 * that a command is queued and ready to be processed.
151 */
152 static int apps_cmd_pipe[2] = { -1, -1 };
153
154 int apps_cmd_notify_pipe[2] = { -1, -1 };
155
156 /* Pthread, Mutexes and Semaphores */
157 static pthread_t apps_thread;
158 static pthread_t apps_notify_thread;
159 static pthread_t reg_apps_thread;
160 static pthread_t client_thread;
161 static pthread_t kernel_thread;
162 static pthread_t dispatch_thread;
163 static pthread_t health_thread;
164 static pthread_t ht_cleanup_thread;
165 static pthread_t jul_reg_thread;
166
167 /*
168 * UST registration command queue. This queue is tied with a futex and uses a N
169 * wakers / 1 waiter implemented and detailed in futex.c/.h
170 *
171 * The thread_manage_apps and thread_dispatch_ust_registration interact with
172 * this queue and the wait/wake scheme.
173 */
174 static struct ust_cmd_queue ust_cmd_queue;
175
176 /*
177 * Pointer initialized before thread creation.
178 *
179 * This points to the tracing session list containing the session count and a
180 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
181 * MUST NOT be taken if you call a public function in session.c.
182 *
183 * The lock is nested inside the structure: session_list_ptr->lock. Please use
184 * session_lock_list and session_unlock_list for lock acquisition.
185 */
186 static struct ltt_session_list *session_list_ptr;
187
188 int ust_consumerd64_fd = -1;
189 int ust_consumerd32_fd = -1;
190
191 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
192 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
193 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
194 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
195
196 static const char *module_proc_lttng = "/proc/lttng";
197
198 /*
199 * Consumer daemon state which is changed when spawning it, killing it or in
200 * case of a fatal error.
201 */
202 enum consumerd_state {
203 CONSUMER_STARTED = 1,
204 CONSUMER_STOPPED = 2,
205 CONSUMER_ERROR = 3,
206 };
207
208 /*
209 * This consumer daemon state is used to validate if a client command will be
210 * able to reach the consumer. If not, the client is informed. For instance,
211 * doing a "lttng start" when the consumer state is set to ERROR will return an
212 * error to the client.
213 *
214 * The following example shows a possible race condition of this scheme:
215 *
216 * consumer thread error happens
217 * client cmd arrives
218 * client cmd checks state -> still OK
219 * consumer thread exit, sets error
220 * client cmd try to talk to consumer
221 * ...
222 *
223 * However, since the consumer is a different daemon, we have no way of making
224 * sure the command will reach it safely even with this state flag. This is why
225 * we consider that up to the state validation during command processing, the
226 * command is safe. After that, we can not guarantee the correctness of the
227 * client request vis-a-vis the consumer.
228 */
229 static enum consumerd_state ust_consumerd_state;
230 static enum consumerd_state kernel_consumerd_state;
231
232 /*
233 * Socket timeout for receiving and sending in seconds.
234 */
235 static int app_socket_timeout;
236
237 /* Set in main() with the current page size. */
238 long page_size;
239
240 /* Application health monitoring */
241 struct health_app *health_sessiond;
242
243 /* JUL TCP port for registration. Used by the JUL thread. */
244 unsigned int jul_tcp_port = DEFAULT_JUL_TCP_PORT;
245
246 static
247 void setup_consumerd_path(void)
248 {
249 const char *bin, *libdir;
250
251 /*
252 * Allow INSTALL_BIN_PATH to be used as a target path for the
253 * native architecture size consumer if CONFIG_CONSUMER*_PATH
254 * has not been defined.
255 */
256 #if (CAA_BITS_PER_LONG == 32)
257 if (!consumerd32_bin[0]) {
258 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
259 }
260 if (!consumerd32_libdir[0]) {
261 consumerd32_libdir = INSTALL_LIB_PATH;
262 }
263 #elif (CAA_BITS_PER_LONG == 64)
264 if (!consumerd64_bin[0]) {
265 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
266 }
267 if (!consumerd64_libdir[0]) {
268 consumerd64_libdir = INSTALL_LIB_PATH;
269 }
270 #else
271 #error "Unknown bitness"
272 #endif
273
274 /*
275 * runtime env. var. overrides the build default.
276 */
277 bin = getenv("LTTNG_CONSUMERD32_BIN");
278 if (bin) {
279 consumerd32_bin = bin;
280 }
281 bin = getenv("LTTNG_CONSUMERD64_BIN");
282 if (bin) {
283 consumerd64_bin = bin;
284 }
285 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
286 if (libdir) {
287 consumerd32_libdir = libdir;
288 }
289 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
290 if (libdir) {
291 consumerd64_libdir = libdir;
292 }
293 }
294
295 /*
296 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
297 */
298 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
299 {
300 int ret;
301
302 assert(events);
303
304 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
305 if (ret < 0) {
306 goto error;
307 }
308
309 /* Add quit pipe */
310 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
311 if (ret < 0) {
312 goto error;
313 }
314
315 return 0;
316
317 error:
318 return ret;
319 }
320
321 /*
322 * Check if the thread quit pipe was triggered.
323 *
324 * Return 1 if it was triggered else 0;
325 */
326 int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
327 {
328 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
329 return 1;
330 }
331
332 return 0;
333 }
334
335 /*
336 * Init thread quit pipe.
337 *
338 * Return -1 on error or 0 if all pipes are created.
339 */
340 static int init_thread_quit_pipe(void)
341 {
342 int ret, i;
343
344 ret = pipe(thread_quit_pipe);
345 if (ret < 0) {
346 PERROR("thread quit pipe");
347 goto error;
348 }
349
350 for (i = 0; i < 2; i++) {
351 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
352 if (ret < 0) {
353 PERROR("fcntl");
354 goto error;
355 }
356 }
357
358 error:
359 return ret;
360 }
361
362 /*
363 * Stop all threads by closing the thread quit pipe.
364 */
365 static void stop_threads(void)
366 {
367 int ret;
368
369 /* Stopping all threads */
370 DBG("Terminating all threads");
371 ret = notify_thread_pipe(thread_quit_pipe[1]);
372 if (ret < 0) {
373 ERR("write error on thread quit pipe");
374 }
375
376 /* Dispatch thread */
377 CMM_STORE_SHARED(dispatch_thread_exit, 1);
378 futex_nto1_wake(&ust_cmd_queue.futex);
379 }
380
381 /*
382 * Close every consumer sockets.
383 */
384 static void close_consumer_sockets(void)
385 {
386 int ret;
387
388 if (kconsumer_data.err_sock >= 0) {
389 ret = close(kconsumer_data.err_sock);
390 if (ret < 0) {
391 PERROR("kernel consumer err_sock close");
392 }
393 }
394 if (ustconsumer32_data.err_sock >= 0) {
395 ret = close(ustconsumer32_data.err_sock);
396 if (ret < 0) {
397 PERROR("UST consumerd32 err_sock close");
398 }
399 }
400 if (ustconsumer64_data.err_sock >= 0) {
401 ret = close(ustconsumer64_data.err_sock);
402 if (ret < 0) {
403 PERROR("UST consumerd64 err_sock close");
404 }
405 }
406 if (kconsumer_data.cmd_sock >= 0) {
407 ret = close(kconsumer_data.cmd_sock);
408 if (ret < 0) {
409 PERROR("kernel consumer cmd_sock close");
410 }
411 }
412 if (ustconsumer32_data.cmd_sock >= 0) {
413 ret = close(ustconsumer32_data.cmd_sock);
414 if (ret < 0) {
415 PERROR("UST consumerd32 cmd_sock close");
416 }
417 }
418 if (ustconsumer64_data.cmd_sock >= 0) {
419 ret = close(ustconsumer64_data.cmd_sock);
420 if (ret < 0) {
421 PERROR("UST consumerd64 cmd_sock close");
422 }
423 }
424 }
425
426 /*
427 * Cleanup the daemon
428 */
429 static void cleanup(void)
430 {
431 int ret;
432 struct ltt_session *sess, *stmp;
433 char path[PATH_MAX];
434
435 DBG("Cleaning up");
436
437 /*
438 * Close the thread quit pipe. It has already done its job,
439 * since we are now called.
440 */
441 utils_close_pipe(thread_quit_pipe);
442
443 /*
444 * If opt_pidfile is undefined, the default file will be wiped when
445 * removing the rundir.
446 */
447 if (opt_pidfile) {
448 ret = remove(opt_pidfile);
449 if (ret < 0) {
450 PERROR("remove pidfile %s", opt_pidfile);
451 }
452 }
453
454 DBG("Removing sessiond and consumerd content of directory %s", rundir);
455
456 /* sessiond */
457 snprintf(path, PATH_MAX,
458 "%s/%s",
459 rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE);
460 DBG("Removing %s", path);
461 (void) unlink(path);
462
463 snprintf(path, PATH_MAX, "%s/%s", rundir,
464 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE);
465 DBG("Removing %s", path);
466 (void) unlink(path);
467
468 /* kconsumerd */
469 snprintf(path, PATH_MAX,
470 DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
471 rundir);
472 DBG("Removing %s", path);
473 (void) unlink(path);
474
475 snprintf(path, PATH_MAX,
476 DEFAULT_KCONSUMERD_PATH,
477 rundir);
478 DBG("Removing directory %s", path);
479 (void) rmdir(path);
480
481 /* ust consumerd 32 */
482 snprintf(path, PATH_MAX,
483 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
484 rundir);
485 DBG("Removing %s", path);
486 (void) unlink(path);
487
488 snprintf(path, PATH_MAX,
489 DEFAULT_USTCONSUMERD32_PATH,
490 rundir);
491 DBG("Removing directory %s", path);
492 (void) rmdir(path);
493
494 /* ust consumerd 64 */
495 snprintf(path, PATH_MAX,
496 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
497 rundir);
498 DBG("Removing %s", path);
499 (void) unlink(path);
500
501 snprintf(path, PATH_MAX,
502 DEFAULT_USTCONSUMERD64_PATH,
503 rundir);
504 DBG("Removing directory %s", path);
505 (void) rmdir(path);
506
507 /*
508 * We do NOT rmdir rundir because there are other processes
509 * using it, for instance lttng-relayd, which can start in
510 * parallel with this teardown.
511 */
512
513 free(rundir);
514
515 DBG("Cleaning up all sessions");
516
517 /* Destroy session list mutex */
518 if (session_list_ptr != NULL) {
519 pthread_mutex_destroy(&session_list_ptr->lock);
520
521 /* Cleanup ALL session */
522 cds_list_for_each_entry_safe(sess, stmp,
523 &session_list_ptr->head, list) {
524 cmd_destroy_session(sess, kernel_poll_pipe[1]);
525 }
526 }
527
528 DBG("Closing all UST sockets");
529 ust_app_clean_list();
530 buffer_reg_destroy_registries();
531
532 if (is_root && !opt_no_kernel) {
533 DBG2("Closing kernel fd");
534 if (kernel_tracer_fd >= 0) {
535 ret = close(kernel_tracer_fd);
536 if (ret) {
537 PERROR("close");
538 }
539 }
540 DBG("Unloading kernel modules");
541 modprobe_remove_lttng_all();
542 }
543
544 close_consumer_sockets();
545
546 /* <fun> */
547 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
548 "Matthew, BEET driven development works!%c[%dm",
549 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
550 /* </fun> */
551 }
552
553 /*
554 * Send data on a unix socket using the liblttsessiondcomm API.
555 *
556 * Return lttcomm error code.
557 */
558 static int send_unix_sock(int sock, void *buf, size_t len)
559 {
560 /* Check valid length */
561 if (len == 0) {
562 return -1;
563 }
564
565 return lttcomm_send_unix_sock(sock, buf, len);
566 }
567
568 /*
569 * Free memory of a command context structure.
570 */
571 static void clean_command_ctx(struct command_ctx **cmd_ctx)
572 {
573 DBG("Clean command context structure");
574 if (*cmd_ctx) {
575 if ((*cmd_ctx)->llm) {
576 free((*cmd_ctx)->llm);
577 }
578 if ((*cmd_ctx)->lsm) {
579 free((*cmd_ctx)->lsm);
580 }
581 free(*cmd_ctx);
582 *cmd_ctx = NULL;
583 }
584 }
585
586 /*
587 * Notify UST applications using the shm mmap futex.
588 */
589 static int notify_ust_apps(int active)
590 {
591 char *wait_shm_mmap;
592
593 DBG("Notifying applications of session daemon state: %d", active);
594
595 /* See shm.c for this call implying mmap, shm and futex calls */
596 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
597 if (wait_shm_mmap == NULL) {
598 goto error;
599 }
600
601 /* Wake waiting process */
602 futex_wait_update((int32_t *) wait_shm_mmap, active);
603
604 /* Apps notified successfully */
605 return 0;
606
607 error:
608 return -1;
609 }
610
611 /*
612 * Setup the outgoing data buffer for the response (llm) by allocating the
613 * right amount of memory and copying the original information from the lsm
614 * structure.
615 *
616 * Return total size of the buffer pointed by buf.
617 */
618 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
619 {
620 int ret, buf_size;
621
622 buf_size = size;
623
624 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
625 if (cmd_ctx->llm == NULL) {
626 PERROR("zmalloc");
627 ret = -ENOMEM;
628 goto error;
629 }
630
631 /* Copy common data */
632 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
633 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
634
635 cmd_ctx->llm->data_size = size;
636 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
637
638 return buf_size;
639
640 error:
641 return ret;
642 }
643
644 /*
645 * Update the kernel poll set of all channel fd available over all tracing
646 * session. Add the wakeup pipe at the end of the set.
647 */
648 static int update_kernel_poll(struct lttng_poll_event *events)
649 {
650 int ret;
651 struct ltt_session *session;
652 struct ltt_kernel_channel *channel;
653
654 DBG("Updating kernel poll set");
655
656 session_lock_list();
657 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
658 session_lock(session);
659 if (session->kernel_session == NULL) {
660 session_unlock(session);
661 continue;
662 }
663
664 cds_list_for_each_entry(channel,
665 &session->kernel_session->channel_list.head, list) {
666 /* Add channel fd to the kernel poll set */
667 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
668 if (ret < 0) {
669 session_unlock(session);
670 goto error;
671 }
672 DBG("Channel fd %d added to kernel set", channel->fd);
673 }
674 session_unlock(session);
675 }
676 session_unlock_list();
677
678 return 0;
679
680 error:
681 session_unlock_list();
682 return -1;
683 }
684
685 /*
686 * Find the channel fd from 'fd' over all tracing session. When found, check
687 * for new channel stream and send those stream fds to the kernel consumer.
688 *
689 * Useful for CPU hotplug feature.
690 */
691 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
692 {
693 int ret = 0;
694 struct ltt_session *session;
695 struct ltt_kernel_session *ksess;
696 struct ltt_kernel_channel *channel;
697
698 DBG("Updating kernel streams for channel fd %d", fd);
699
700 session_lock_list();
701 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
702 session_lock(session);
703 if (session->kernel_session == NULL) {
704 session_unlock(session);
705 continue;
706 }
707 ksess = session->kernel_session;
708
709 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
710 if (channel->fd == fd) {
711 DBG("Channel found, updating kernel streams");
712 ret = kernel_open_channel_stream(channel);
713 if (ret < 0) {
714 goto error;
715 }
716 /* Update the stream global counter */
717 ksess->stream_count_global += ret;
718
719 /*
720 * Have we already sent fds to the consumer? If yes, it means
721 * that tracing is started so it is safe to send our updated
722 * stream fds.
723 */
724 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
725 struct lttng_ht_iter iter;
726 struct consumer_socket *socket;
727
728 rcu_read_lock();
729 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
730 &iter.iter, socket, node.node) {
731 pthread_mutex_lock(socket->lock);
732 ret = kernel_consumer_send_channel_stream(socket,
733 channel, ksess,
734 session->output_traces ? 1 : 0);
735 pthread_mutex_unlock(socket->lock);
736 if (ret < 0) {
737 rcu_read_unlock();
738 goto error;
739 }
740 }
741 rcu_read_unlock();
742 }
743 goto error;
744 }
745 }
746 session_unlock(session);
747 }
748 session_unlock_list();
749 return ret;
750
751 error:
752 session_unlock(session);
753 session_unlock_list();
754 return ret;
755 }
756
757 /*
758 * For each tracing session, update newly registered apps. The session list
759 * lock MUST be acquired before calling this.
760 */
761 static void update_ust_app(int app_sock)
762 {
763 struct ltt_session *sess, *stmp;
764
765 /* Consumer is in an ERROR state. Stop any application update. */
766 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
767 /* Stop the update process since the consumer is dead. */
768 return;
769 }
770
771 /* For all tracing session(s) */
772 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
773 session_lock(sess);
774 if (sess->ust_session) {
775 ust_app_global_update(sess->ust_session, app_sock);
776 }
777 session_unlock(sess);
778 }
779 }
780
781 /*
782 * This thread manage event coming from the kernel.
783 *
784 * Features supported in this thread:
785 * -) CPU Hotplug
786 */
787 static void *thread_manage_kernel(void *data)
788 {
789 int ret, i, pollfd, update_poll_flag = 1, err = -1;
790 uint32_t revents, nb_fd;
791 char tmp;
792 struct lttng_poll_event events;
793
794 DBG("[thread] Thread manage kernel started");
795
796 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
797
798 /*
799 * This first step of the while is to clean this structure which could free
800 * non NULL pointers so initialize it before the loop.
801 */
802 lttng_poll_init(&events);
803
804 if (testpoint(thread_manage_kernel)) {
805 goto error_testpoint;
806 }
807
808 health_code_update();
809
810 if (testpoint(thread_manage_kernel_before_loop)) {
811 goto error_testpoint;
812 }
813
814 while (1) {
815 health_code_update();
816
817 if (update_poll_flag == 1) {
818 /* Clean events object. We are about to populate it again. */
819 lttng_poll_clean(&events);
820
821 ret = sessiond_set_thread_pollset(&events, 2);
822 if (ret < 0) {
823 goto error_poll_create;
824 }
825
826 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
827 if (ret < 0) {
828 goto error;
829 }
830
831 /* This will add the available kernel channel if any. */
832 ret = update_kernel_poll(&events);
833 if (ret < 0) {
834 goto error;
835 }
836 update_poll_flag = 0;
837 }
838
839 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
840
841 /* Poll infinite value of time */
842 restart:
843 health_poll_entry();
844 ret = lttng_poll_wait(&events, -1);
845 health_poll_exit();
846 if (ret < 0) {
847 /*
848 * Restart interrupted system call.
849 */
850 if (errno == EINTR) {
851 goto restart;
852 }
853 goto error;
854 } else if (ret == 0) {
855 /* Should not happen since timeout is infinite */
856 ERR("Return value of poll is 0 with an infinite timeout.\n"
857 "This should not have happened! Continuing...");
858 continue;
859 }
860
861 nb_fd = ret;
862
863 for (i = 0; i < nb_fd; i++) {
864 /* Fetch once the poll data */
865 revents = LTTNG_POLL_GETEV(&events, i);
866 pollfd = LTTNG_POLL_GETFD(&events, i);
867
868 health_code_update();
869
870 /* Thread quit pipe has been closed. Killing thread. */
871 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
872 if (ret) {
873 err = 0;
874 goto exit;
875 }
876
877 /* Check for data on kernel pipe */
878 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
879 (void) lttng_read(kernel_poll_pipe[0],
880 &tmp, 1);
881 /*
882 * Ret value is useless here, if this pipe gets any actions an
883 * update is required anyway.
884 */
885 update_poll_flag = 1;
886 continue;
887 } else {
888 /*
889 * New CPU detected by the kernel. Adding kernel stream to
890 * kernel session and updating the kernel consumer
891 */
892 if (revents & LPOLLIN) {
893 ret = update_kernel_stream(&kconsumer_data, pollfd);
894 if (ret < 0) {
895 continue;
896 }
897 break;
898 /*
899 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
900 * and unregister kernel stream at this point.
901 */
902 }
903 }
904 }
905 }
906
907 exit:
908 error:
909 lttng_poll_clean(&events);
910 error_poll_create:
911 error_testpoint:
912 utils_close_pipe(kernel_poll_pipe);
913 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
914 if (err) {
915 health_error();
916 ERR("Health error occurred in %s", __func__);
917 WARN("Kernel thread died unexpectedly. "
918 "Kernel tracing can continue but CPU hotplug is disabled.");
919 }
920 health_unregister(health_sessiond);
921 DBG("Kernel thread dying");
922 return NULL;
923 }
924
925 /*
926 * Signal pthread condition of the consumer data that the thread.
927 */
928 static void signal_consumer_condition(struct consumer_data *data, int state)
929 {
930 pthread_mutex_lock(&data->cond_mutex);
931
932 /*
933 * The state is set before signaling. It can be any value, it's the waiter
934 * job to correctly interpret this condition variable associated to the
935 * consumer pthread_cond.
936 *
937 * A value of 0 means that the corresponding thread of the consumer data
938 * was not started. 1 indicates that the thread has started and is ready
939 * for action. A negative value means that there was an error during the
940 * thread bootstrap.
941 */
942 data->consumer_thread_is_ready = state;
943 (void) pthread_cond_signal(&data->cond);
944
945 pthread_mutex_unlock(&data->cond_mutex);
946 }
947
948 /*
949 * This thread manage the consumer error sent back to the session daemon.
950 */
951 static void *thread_manage_consumer(void *data)
952 {
953 int sock = -1, i, ret, pollfd, err = -1;
954 uint32_t revents, nb_fd;
955 enum lttcomm_return_code code;
956 struct lttng_poll_event events;
957 struct consumer_data *consumer_data = data;
958
959 DBG("[thread] Manage consumer started");
960
961 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
962
963 health_code_update();
964
965 /*
966 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
967 * metadata_sock. Nothing more will be added to this poll set.
968 */
969 ret = sessiond_set_thread_pollset(&events, 3);
970 if (ret < 0) {
971 goto error_poll;
972 }
973
974 /*
975 * The error socket here is already in a listening state which was done
976 * just before spawning this thread to avoid a race between the consumer
977 * daemon exec trying to connect and the listen() call.
978 */
979 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
980 if (ret < 0) {
981 goto error;
982 }
983
984 health_code_update();
985
986 /* Infinite blocking call, waiting for transmission */
987 restart:
988 health_poll_entry();
989
990 if (testpoint(thread_manage_consumer)) {
991 goto error;
992 }
993
994 ret = lttng_poll_wait(&events, -1);
995 health_poll_exit();
996 if (ret < 0) {
997 /*
998 * Restart interrupted system call.
999 */
1000 if (errno == EINTR) {
1001 goto restart;
1002 }
1003 goto error;
1004 }
1005
1006 nb_fd = ret;
1007
1008 for (i = 0; i < nb_fd; i++) {
1009 /* Fetch once the poll data */
1010 revents = LTTNG_POLL_GETEV(&events, i);
1011 pollfd = LTTNG_POLL_GETFD(&events, i);
1012
1013 health_code_update();
1014
1015 /* Thread quit pipe has been closed. Killing thread. */
1016 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1017 if (ret) {
1018 err = 0;
1019 goto exit;
1020 }
1021
1022 /* Event on the registration socket */
1023 if (pollfd == consumer_data->err_sock) {
1024 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1025 ERR("consumer err socket poll error");
1026 goto error;
1027 }
1028 }
1029 }
1030
1031 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1032 if (sock < 0) {
1033 goto error;
1034 }
1035
1036 /*
1037 * Set the CLOEXEC flag. Return code is useless because either way, the
1038 * show must go on.
1039 */
1040 (void) utils_set_fd_cloexec(sock);
1041
1042 health_code_update();
1043
1044 DBG2("Receiving code from consumer err_sock");
1045
1046 /* Getting status code from kconsumerd */
1047 ret = lttcomm_recv_unix_sock(sock, &code,
1048 sizeof(enum lttcomm_return_code));
1049 if (ret <= 0) {
1050 goto error;
1051 }
1052
1053 health_code_update();
1054
1055 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
1056 /* Connect both socket, command and metadata. */
1057 consumer_data->cmd_sock =
1058 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1059 consumer_data->metadata_fd =
1060 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1061 if (consumer_data->cmd_sock < 0
1062 || consumer_data->metadata_fd < 0) {
1063 PERROR("consumer connect cmd socket");
1064 /* On error, signal condition and quit. */
1065 signal_consumer_condition(consumer_data, -1);
1066 goto error;
1067 }
1068 consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
1069 /* Create metadata socket lock. */
1070 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
1071 if (consumer_data->metadata_sock.lock == NULL) {
1072 PERROR("zmalloc pthread mutex");
1073 ret = -1;
1074 goto error;
1075 }
1076 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
1077
1078 signal_consumer_condition(consumer_data, 1);
1079 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
1080 DBG("Consumer metadata socket ready (fd: %d)",
1081 consumer_data->metadata_fd);
1082 } else {
1083 ERR("consumer error when waiting for SOCK_READY : %s",
1084 lttcomm_get_readable_code(-code));
1085 goto error;
1086 }
1087
1088 /* Remove the consumerd error sock since we've established a connexion */
1089 ret = lttng_poll_del(&events, consumer_data->err_sock);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 /* Add new accepted error socket. */
1095 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1096 if (ret < 0) {
1097 goto error;
1098 }
1099
1100 /* Add metadata socket that is successfully connected. */
1101 ret = lttng_poll_add(&events, consumer_data->metadata_fd,
1102 LPOLLIN | LPOLLRDHUP);
1103 if (ret < 0) {
1104 goto error;
1105 }
1106
1107 health_code_update();
1108
1109 /* Infinite blocking call, waiting for transmission */
1110 restart_poll:
1111 while (1) {
1112 health_poll_entry();
1113 ret = lttng_poll_wait(&events, -1);
1114 health_poll_exit();
1115 if (ret < 0) {
1116 /*
1117 * Restart interrupted system call.
1118 */
1119 if (errno == EINTR) {
1120 goto restart_poll;
1121 }
1122 goto error;
1123 }
1124
1125 nb_fd = ret;
1126
1127 for (i = 0; i < nb_fd; i++) {
1128 /* Fetch once the poll data */
1129 revents = LTTNG_POLL_GETEV(&events, i);
1130 pollfd = LTTNG_POLL_GETFD(&events, i);
1131
1132 health_code_update();
1133
1134 /* Thread quit pipe has been closed. Killing thread. */
1135 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1136 if (ret) {
1137 err = 0;
1138 goto exit;
1139 }
1140
1141 if (pollfd == sock) {
1142 /* Event on the consumerd socket */
1143 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1144 ERR("consumer err socket second poll error");
1145 goto error;
1146 }
1147 health_code_update();
1148 /* Wait for any kconsumerd error */
1149 ret = lttcomm_recv_unix_sock(sock, &code,
1150 sizeof(enum lttcomm_return_code));
1151 if (ret <= 0) {
1152 ERR("consumer closed the command socket");
1153 goto error;
1154 }
1155
1156 ERR("consumer return code : %s",
1157 lttcomm_get_readable_code(-code));
1158
1159 goto exit;
1160 } else if (pollfd == consumer_data->metadata_fd) {
1161 /* UST metadata requests */
1162 ret = ust_consumer_metadata_request(
1163 &consumer_data->metadata_sock);
1164 if (ret < 0) {
1165 ERR("Handling metadata request");
1166 goto error;
1167 }
1168 break;
1169 } else {
1170 ERR("Unknown pollfd");
1171 goto error;
1172 }
1173 }
1174 health_code_update();
1175 }
1176
1177 exit:
1178 error:
1179 /*
1180 * We lock here because we are about to close the sockets and some other
1181 * thread might be using them so get exclusive access which will abort all
1182 * other consumer command by other threads.
1183 */
1184 pthread_mutex_lock(&consumer_data->lock);
1185
1186 /* Immediately set the consumerd state to stopped */
1187 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1188 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1189 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1190 consumer_data->type == LTTNG_CONSUMER32_UST) {
1191 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1192 } else {
1193 /* Code flow error... */
1194 assert(0);
1195 }
1196
1197 if (consumer_data->err_sock >= 0) {
1198 ret = close(consumer_data->err_sock);
1199 if (ret) {
1200 PERROR("close");
1201 }
1202 consumer_data->err_sock = -1;
1203 }
1204 if (consumer_data->cmd_sock >= 0) {
1205 ret = close(consumer_data->cmd_sock);
1206 if (ret) {
1207 PERROR("close");
1208 }
1209 consumer_data->cmd_sock = -1;
1210 }
1211 if (*consumer_data->metadata_sock.fd_ptr >= 0) {
1212 ret = close(*consumer_data->metadata_sock.fd_ptr);
1213 if (ret) {
1214 PERROR("close");
1215 }
1216 }
1217
1218 if (sock >= 0) {
1219 ret = close(sock);
1220 if (ret) {
1221 PERROR("close");
1222 }
1223 }
1224
1225 unlink(consumer_data->err_unix_sock_path);
1226 unlink(consumer_data->cmd_unix_sock_path);
1227 consumer_data->pid = 0;
1228 pthread_mutex_unlock(&consumer_data->lock);
1229
1230 /* Cleanup metadata socket mutex. */
1231 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1232 free(consumer_data->metadata_sock.lock);
1233
1234 lttng_poll_clean(&events);
1235 error_poll:
1236 if (err) {
1237 health_error();
1238 ERR("Health error occurred in %s", __func__);
1239 }
1240 health_unregister(health_sessiond);
1241 DBG("consumer thread cleanup completed");
1242
1243 return NULL;
1244 }
1245
1246 /*
1247 * This thread manage application communication.
1248 */
1249 static void *thread_manage_apps(void *data)
1250 {
1251 int i, ret, pollfd, err = -1;
1252 ssize_t size_ret;
1253 uint32_t revents, nb_fd;
1254 struct lttng_poll_event events;
1255
1256 DBG("[thread] Manage application started");
1257
1258 rcu_register_thread();
1259 rcu_thread_online();
1260
1261 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
1262
1263 if (testpoint(thread_manage_apps)) {
1264 goto error_testpoint;
1265 }
1266
1267 health_code_update();
1268
1269 ret = sessiond_set_thread_pollset(&events, 2);
1270 if (ret < 0) {
1271 goto error_poll_create;
1272 }
1273
1274 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1275 if (ret < 0) {
1276 goto error;
1277 }
1278
1279 if (testpoint(thread_manage_apps_before_loop)) {
1280 goto error;
1281 }
1282
1283 health_code_update();
1284
1285 while (1) {
1286 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
1287
1288 /* Inifinite blocking call, waiting for transmission */
1289 restart:
1290 health_poll_entry();
1291 ret = lttng_poll_wait(&events, -1);
1292 health_poll_exit();
1293 if (ret < 0) {
1294 /*
1295 * Restart interrupted system call.
1296 */
1297 if (errno == EINTR) {
1298 goto restart;
1299 }
1300 goto error;
1301 }
1302
1303 nb_fd = ret;
1304
1305 for (i = 0; i < nb_fd; i++) {
1306 /* Fetch once the poll data */
1307 revents = LTTNG_POLL_GETEV(&events, i);
1308 pollfd = LTTNG_POLL_GETFD(&events, i);
1309
1310 health_code_update();
1311
1312 /* Thread quit pipe has been closed. Killing thread. */
1313 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1314 if (ret) {
1315 err = 0;
1316 goto exit;
1317 }
1318
1319 /* Inspect the apps cmd pipe */
1320 if (pollfd == apps_cmd_pipe[0]) {
1321 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1322 ERR("Apps command pipe error");
1323 goto error;
1324 } else if (revents & LPOLLIN) {
1325 int sock;
1326
1327 /* Empty pipe */
1328 size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
1329 if (size_ret < sizeof(sock)) {
1330 PERROR("read apps cmd pipe");
1331 goto error;
1332 }
1333
1334 health_code_update();
1335
1336 /*
1337 * We only monitor the error events of the socket. This
1338 * thread does not handle any incoming data from UST
1339 * (POLLIN).
1340 */
1341 ret = lttng_poll_add(&events, sock,
1342 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1343 if (ret < 0) {
1344 goto error;
1345 }
1346
1347 DBG("Apps with sock %d added to poll set", sock);
1348
1349 health_code_update();
1350
1351 break;
1352 }
1353 } else {
1354 /*
1355 * At this point, we know that a registered application made
1356 * the event at poll_wait.
1357 */
1358 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1359 /* Removing from the poll set */
1360 ret = lttng_poll_del(&events, pollfd);
1361 if (ret < 0) {
1362 goto error;
1363 }
1364
1365 /* Socket closed on remote end. */
1366 ust_app_unregister(pollfd);
1367 break;
1368 }
1369 }
1370
1371 health_code_update();
1372 }
1373 }
1374
1375 exit:
1376 error:
1377 lttng_poll_clean(&events);
1378 error_poll_create:
1379 error_testpoint:
1380 utils_close_pipe(apps_cmd_pipe);
1381 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1382
1383 /*
1384 * We don't clean the UST app hash table here since already registered
1385 * applications can still be controlled so let them be until the session
1386 * daemon dies or the applications stop.
1387 */
1388
1389 if (err) {
1390 health_error();
1391 ERR("Health error occurred in %s", __func__);
1392 }
1393 health_unregister(health_sessiond);
1394 DBG("Application communication apps thread cleanup complete");
1395 rcu_thread_offline();
1396 rcu_unregister_thread();
1397 return NULL;
1398 }
1399
1400 /*
1401 * Send a socket to a thread This is called from the dispatch UST registration
1402 * thread once all sockets are set for the application.
1403 *
1404 * The sock value can be invalid, we don't really care, the thread will handle
1405 * it and make the necessary cleanup if so.
1406 *
1407 * On success, return 0 else a negative value being the errno message of the
1408 * write().
1409 */
1410 static int send_socket_to_thread(int fd, int sock)
1411 {
1412 ssize_t ret;
1413
1414 /*
1415 * It's possible that the FD is set as invalid with -1 concurrently just
1416 * before calling this function being a shutdown state of the thread.
1417 */
1418 if (fd < 0) {
1419 ret = -EBADF;
1420 goto error;
1421 }
1422
1423 ret = lttng_write(fd, &sock, sizeof(sock));
1424 if (ret < sizeof(sock)) {
1425 PERROR("write apps pipe %d", fd);
1426 if (ret < 0) {
1427 ret = -errno;
1428 }
1429 goto error;
1430 }
1431
1432 /* All good. Don't send back the write positive ret value. */
1433 ret = 0;
1434 error:
1435 return (int) ret;
1436 }
1437
1438 /*
1439 * Sanitize the wait queue of the dispatch registration thread meaning removing
1440 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1441 * notify socket is never received.
1442 */
1443 static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1444 {
1445 int ret, nb_fd = 0, i;
1446 unsigned int fd_added = 0;
1447 struct lttng_poll_event events;
1448 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1449
1450 assert(wait_queue);
1451
1452 lttng_poll_init(&events);
1453
1454 /* Just skip everything for an empty queue. */
1455 if (!wait_queue->count) {
1456 goto end;
1457 }
1458
1459 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1460 if (ret < 0) {
1461 goto error_create;
1462 }
1463
1464 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1465 &wait_queue->head, head) {
1466 assert(wait_node->app);
1467 ret = lttng_poll_add(&events, wait_node->app->sock,
1468 LPOLLHUP | LPOLLERR);
1469 if (ret < 0) {
1470 goto error;
1471 }
1472
1473 fd_added = 1;
1474 }
1475
1476 if (!fd_added) {
1477 goto end;
1478 }
1479
1480 /*
1481 * Poll but don't block so we can quickly identify the faulty events and
1482 * clean them afterwards from the wait queue.
1483 */
1484 ret = lttng_poll_wait(&events, 0);
1485 if (ret < 0) {
1486 goto error;
1487 }
1488 nb_fd = ret;
1489
1490 for (i = 0; i < nb_fd; i++) {
1491 /* Get faulty FD. */
1492 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1493 int pollfd = LTTNG_POLL_GETFD(&events, i);
1494
1495 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1496 &wait_queue->head, head) {
1497 if (pollfd == wait_node->app->sock &&
1498 (revents & (LPOLLHUP | LPOLLERR))) {
1499 cds_list_del(&wait_node->head);
1500 wait_queue->count--;
1501 ust_app_destroy(wait_node->app);
1502 free(wait_node);
1503 break;
1504 }
1505 }
1506 }
1507
1508 if (nb_fd > 0) {
1509 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1510 }
1511
1512 end:
1513 lttng_poll_clean(&events);
1514 return;
1515
1516 error:
1517 lttng_poll_clean(&events);
1518 error_create:
1519 ERR("Unable to sanitize wait queue");
1520 return;
1521 }
1522
1523 /*
1524 * Dispatch request from the registration threads to the application
1525 * communication thread.
1526 */
1527 static void *thread_dispatch_ust_registration(void *data)
1528 {
1529 int ret, err = -1;
1530 struct cds_wfq_node *node;
1531 struct ust_command *ust_cmd = NULL;
1532 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1533 struct ust_reg_wait_queue wait_queue = {
1534 .count = 0,
1535 };
1536
1537 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
1538
1539 health_code_update();
1540
1541 CDS_INIT_LIST_HEAD(&wait_queue.head);
1542
1543 DBG("[thread] Dispatch UST command started");
1544
1545 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
1546 health_code_update();
1547
1548 /* Atomically prepare the queue futex */
1549 futex_nto1_prepare(&ust_cmd_queue.futex);
1550
1551 do {
1552 struct ust_app *app = NULL;
1553 ust_cmd = NULL;
1554
1555 /*
1556 * Make sure we don't have node(s) that have hung up before receiving
1557 * the notify socket. This is to clean the list in order to avoid
1558 * memory leaks from notify socket that are never seen.
1559 */
1560 sanitize_wait_queue(&wait_queue);
1561
1562 health_code_update();
1563 /* Dequeue command for registration */
1564 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1565 if (node == NULL) {
1566 DBG("Woken up but nothing in the UST command queue");
1567 /* Continue thread execution */
1568 break;
1569 }
1570
1571 ust_cmd = caa_container_of(node, struct ust_command, node);
1572
1573 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1574 " gid:%d sock:%d name:%s (version %d.%d)",
1575 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1576 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1577 ust_cmd->sock, ust_cmd->reg_msg.name,
1578 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1579
1580 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1581 wait_node = zmalloc(sizeof(*wait_node));
1582 if (!wait_node) {
1583 PERROR("zmalloc wait_node dispatch");
1584 ret = close(ust_cmd->sock);
1585 if (ret < 0) {
1586 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1587 }
1588 lttng_fd_put(LTTNG_FD_APPS, 1);
1589 free(ust_cmd);
1590 goto error;
1591 }
1592 CDS_INIT_LIST_HEAD(&wait_node->head);
1593
1594 /* Create application object if socket is CMD. */
1595 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1596 ust_cmd->sock);
1597 if (!wait_node->app) {
1598 ret = close(ust_cmd->sock);
1599 if (ret < 0) {
1600 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1601 }
1602 lttng_fd_put(LTTNG_FD_APPS, 1);
1603 free(wait_node);
1604 free(ust_cmd);
1605 continue;
1606 }
1607 /*
1608 * Add application to the wait queue so we can set the notify
1609 * socket before putting this object in the global ht.
1610 */
1611 cds_list_add(&wait_node->head, &wait_queue.head);
1612 wait_queue.count++;
1613
1614 free(ust_cmd);
1615 /*
1616 * We have to continue here since we don't have the notify
1617 * socket and the application MUST be added to the hash table
1618 * only at that moment.
1619 */
1620 continue;
1621 } else {
1622 /*
1623 * Look for the application in the local wait queue and set the
1624 * notify socket if found.
1625 */
1626 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1627 &wait_queue.head, head) {
1628 health_code_update();
1629 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1630 wait_node->app->notify_sock = ust_cmd->sock;
1631 cds_list_del(&wait_node->head);
1632 wait_queue.count--;
1633 app = wait_node->app;
1634 free(wait_node);
1635 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1636 break;
1637 }
1638 }
1639
1640 /*
1641 * With no application at this stage the received socket is
1642 * basically useless so close it before we free the cmd data
1643 * structure for good.
1644 */
1645 if (!app) {
1646 ret = close(ust_cmd->sock);
1647 if (ret < 0) {
1648 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1649 }
1650 lttng_fd_put(LTTNG_FD_APPS, 1);
1651 }
1652 free(ust_cmd);
1653 }
1654
1655 if (app) {
1656 /*
1657 * @session_lock_list
1658 *
1659 * Lock the global session list so from the register up to the
1660 * registration done message, no thread can see the application
1661 * and change its state.
1662 */
1663 session_lock_list();
1664 rcu_read_lock();
1665
1666 /*
1667 * Add application to the global hash table. This needs to be
1668 * done before the update to the UST registry can locate the
1669 * application.
1670 */
1671 ust_app_add(app);
1672
1673 /* Set app version. This call will print an error if needed. */
1674 (void) ust_app_version(app);
1675
1676 /* Send notify socket through the notify pipe. */
1677 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1678 app->notify_sock);
1679 if (ret < 0) {
1680 rcu_read_unlock();
1681 session_unlock_list();
1682 /*
1683 * No notify thread, stop the UST tracing. However, this is
1684 * not an internal error of the this thread thus setting
1685 * the health error code to a normal exit.
1686 */
1687 err = 0;
1688 goto error;
1689 }
1690
1691 /*
1692 * Update newly registered application with the tracing
1693 * registry info already enabled information.
1694 */
1695 update_ust_app(app->sock);
1696
1697 /*
1698 * Don't care about return value. Let the manage apps threads
1699 * handle app unregistration upon socket close.
1700 */
1701 (void) ust_app_register_done(app->sock);
1702
1703 /*
1704 * Even if the application socket has been closed, send the app
1705 * to the thread and unregistration will take place at that
1706 * place.
1707 */
1708 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
1709 if (ret < 0) {
1710 rcu_read_unlock();
1711 session_unlock_list();
1712 /*
1713 * No apps. thread, stop the UST tracing. However, this is
1714 * not an internal error of the this thread thus setting
1715 * the health error code to a normal exit.
1716 */
1717 err = 0;
1718 goto error;
1719 }
1720
1721 rcu_read_unlock();
1722 session_unlock_list();
1723 }
1724 } while (node != NULL);
1725
1726 health_poll_entry();
1727 /* Futex wait on queue. Blocking call on futex() */
1728 futex_nto1_wait(&ust_cmd_queue.futex);
1729 health_poll_exit();
1730 }
1731 /* Normal exit, no error */
1732 err = 0;
1733
1734 error:
1735 /* Clean up wait queue. */
1736 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1737 &wait_queue.head, head) {
1738 cds_list_del(&wait_node->head);
1739 wait_queue.count--;
1740 free(wait_node);
1741 }
1742
1743 DBG("Dispatch thread dying");
1744 if (err) {
1745 health_error();
1746 ERR("Health error occurred in %s", __func__);
1747 }
1748 health_unregister(health_sessiond);
1749 return NULL;
1750 }
1751
1752 /*
1753 * This thread manage application registration.
1754 */
1755 static void *thread_registration_apps(void *data)
1756 {
1757 int sock = -1, i, ret, pollfd, err = -1;
1758 uint32_t revents, nb_fd;
1759 struct lttng_poll_event events;
1760 /*
1761 * Get allocated in this thread, enqueued to a global queue, dequeued and
1762 * freed in the manage apps thread.
1763 */
1764 struct ust_command *ust_cmd = NULL;
1765
1766 DBG("[thread] Manage application registration started");
1767
1768 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
1769
1770 if (testpoint(thread_registration_apps)) {
1771 goto error_testpoint;
1772 }
1773
1774 ret = lttcomm_listen_unix_sock(apps_sock);
1775 if (ret < 0) {
1776 goto error_listen;
1777 }
1778
1779 /*
1780 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1781 * more will be added to this poll set.
1782 */
1783 ret = sessiond_set_thread_pollset(&events, 2);
1784 if (ret < 0) {
1785 goto error_create_poll;
1786 }
1787
1788 /* Add the application registration socket */
1789 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1790 if (ret < 0) {
1791 goto error_poll_add;
1792 }
1793
1794 /* Notify all applications to register */
1795 ret = notify_ust_apps(1);
1796 if (ret < 0) {
1797 ERR("Failed to notify applications or create the wait shared memory.\n"
1798 "Execution continues but there might be problem for already\n"
1799 "running applications that wishes to register.");
1800 }
1801
1802 while (1) {
1803 DBG("Accepting application registration");
1804
1805 /* Inifinite blocking call, waiting for transmission */
1806 restart:
1807 health_poll_entry();
1808 ret = lttng_poll_wait(&events, -1);
1809 health_poll_exit();
1810 if (ret < 0) {
1811 /*
1812 * Restart interrupted system call.
1813 */
1814 if (errno == EINTR) {
1815 goto restart;
1816 }
1817 goto error;
1818 }
1819
1820 nb_fd = ret;
1821
1822 for (i = 0; i < nb_fd; i++) {
1823 health_code_update();
1824
1825 /* Fetch once the poll data */
1826 revents = LTTNG_POLL_GETEV(&events, i);
1827 pollfd = LTTNG_POLL_GETFD(&events, i);
1828
1829 /* Thread quit pipe has been closed. Killing thread. */
1830 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1831 if (ret) {
1832 err = 0;
1833 goto exit;
1834 }
1835
1836 /* Event on the registration socket */
1837 if (pollfd == apps_sock) {
1838 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1839 ERR("Register apps socket poll error");
1840 goto error;
1841 } else if (revents & LPOLLIN) {
1842 sock = lttcomm_accept_unix_sock(apps_sock);
1843 if (sock < 0) {
1844 goto error;
1845 }
1846
1847 /*
1848 * Set socket timeout for both receiving and ending.
1849 * app_socket_timeout is in seconds, whereas
1850 * lttcomm_setsockopt_rcv_timeout and
1851 * lttcomm_setsockopt_snd_timeout expect msec as
1852 * parameter.
1853 */
1854 (void) lttcomm_setsockopt_rcv_timeout(sock,
1855 app_socket_timeout * 1000);
1856 (void) lttcomm_setsockopt_snd_timeout(sock,
1857 app_socket_timeout * 1000);
1858
1859 /*
1860 * Set the CLOEXEC flag. Return code is useless because
1861 * either way, the show must go on.
1862 */
1863 (void) utils_set_fd_cloexec(sock);
1864
1865 /* Create UST registration command for enqueuing */
1866 ust_cmd = zmalloc(sizeof(struct ust_command));
1867 if (ust_cmd == NULL) {
1868 PERROR("ust command zmalloc");
1869 goto error;
1870 }
1871
1872 /*
1873 * Using message-based transmissions to ensure we don't
1874 * have to deal with partially received messages.
1875 */
1876 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1877 if (ret < 0) {
1878 ERR("Exhausted file descriptors allowed for applications.");
1879 free(ust_cmd);
1880 ret = close(sock);
1881 if (ret) {
1882 PERROR("close");
1883 }
1884 sock = -1;
1885 continue;
1886 }
1887
1888 health_code_update();
1889 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
1890 if (ret < 0) {
1891 free(ust_cmd);
1892 /* Close socket of the application. */
1893 ret = close(sock);
1894 if (ret) {
1895 PERROR("close");
1896 }
1897 lttng_fd_put(LTTNG_FD_APPS, 1);
1898 sock = -1;
1899 continue;
1900 }
1901 health_code_update();
1902
1903 ust_cmd->sock = sock;
1904 sock = -1;
1905
1906 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1907 " gid:%d sock:%d name:%s (version %d.%d)",
1908 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1909 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1910 ust_cmd->sock, ust_cmd->reg_msg.name,
1911 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1912
1913 /*
1914 * Lock free enqueue the registration request. The red pill
1915 * has been taken! This apps will be part of the *system*.
1916 */
1917 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1918
1919 /*
1920 * Wake the registration queue futex. Implicit memory
1921 * barrier with the exchange in cds_wfq_enqueue.
1922 */
1923 futex_nto1_wake(&ust_cmd_queue.futex);
1924 }
1925 }
1926 }
1927 }
1928
1929 exit:
1930 error:
1931 if (err) {
1932 health_error();
1933 ERR("Health error occurred in %s", __func__);
1934 }
1935
1936 /* Notify that the registration thread is gone */
1937 notify_ust_apps(0);
1938
1939 if (apps_sock >= 0) {
1940 ret = close(apps_sock);
1941 if (ret) {
1942 PERROR("close");
1943 }
1944 }
1945 if (sock >= 0) {
1946 ret = close(sock);
1947 if (ret) {
1948 PERROR("close");
1949 }
1950 lttng_fd_put(LTTNG_FD_APPS, 1);
1951 }
1952 unlink(apps_unix_sock_path);
1953
1954 error_poll_add:
1955 lttng_poll_clean(&events);
1956 error_listen:
1957 error_create_poll:
1958 error_testpoint:
1959 DBG("UST Registration thread cleanup complete");
1960 health_unregister(health_sessiond);
1961
1962 return NULL;
1963 }
1964
1965 /*
1966 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1967 * exec or it will fails.
1968 */
1969 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1970 {
1971 int ret, clock_ret;
1972 struct timespec timeout;
1973
1974 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1975 consumer_data->consumer_thread_is_ready = 0;
1976
1977 /* Setup pthread condition */
1978 ret = pthread_condattr_init(&consumer_data->condattr);
1979 if (ret != 0) {
1980 errno = ret;
1981 PERROR("pthread_condattr_init consumer data");
1982 goto error;
1983 }
1984
1985 /*
1986 * Set the monotonic clock in order to make sure we DO NOT jump in time
1987 * between the clock_gettime() call and the timedwait call. See bug #324
1988 * for a more details and how we noticed it.
1989 */
1990 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
1991 if (ret != 0) {
1992 errno = ret;
1993 PERROR("pthread_condattr_setclock consumer data");
1994 goto error;
1995 }
1996
1997 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
1998 if (ret != 0) {
1999 errno = ret;
2000 PERROR("pthread_cond_init consumer data");
2001 goto error;
2002 }
2003
2004 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
2005 consumer_data);
2006 if (ret != 0) {
2007 PERROR("pthread_create consumer");
2008 ret = -1;
2009 goto error;
2010 }
2011
2012 /* We are about to wait on a pthread condition */
2013 pthread_mutex_lock(&consumer_data->cond_mutex);
2014
2015 /* Get time for sem_timedwait absolute timeout */
2016 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
2017 /*
2018 * Set the timeout for the condition timed wait even if the clock gettime
2019 * call fails since we might loop on that call and we want to avoid to
2020 * increment the timeout too many times.
2021 */
2022 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
2023
2024 /*
2025 * The following loop COULD be skipped in some conditions so this is why we
2026 * set ret to 0 in order to make sure at least one round of the loop is
2027 * done.
2028 */
2029 ret = 0;
2030
2031 /*
2032 * Loop until the condition is reached or when a timeout is reached. Note
2033 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2034 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2035 * possible. This loop does not take any chances and works with both of
2036 * them.
2037 */
2038 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
2039 if (clock_ret < 0) {
2040 PERROR("clock_gettime spawn consumer");
2041 /* Infinite wait for the consumerd thread to be ready */
2042 ret = pthread_cond_wait(&consumer_data->cond,
2043 &consumer_data->cond_mutex);
2044 } else {
2045 ret = pthread_cond_timedwait(&consumer_data->cond,
2046 &consumer_data->cond_mutex, &timeout);
2047 }
2048 }
2049
2050 /* Release the pthread condition */
2051 pthread_mutex_unlock(&consumer_data->cond_mutex);
2052
2053 if (ret != 0) {
2054 errno = ret;
2055 if (ret == ETIMEDOUT) {
2056 /*
2057 * Call has timed out so we kill the kconsumerd_thread and return
2058 * an error.
2059 */
2060 ERR("Condition timed out. The consumer thread was never ready."
2061 " Killing it");
2062 ret = pthread_cancel(consumer_data->thread);
2063 if (ret < 0) {
2064 PERROR("pthread_cancel consumer thread");
2065 }
2066 } else {
2067 PERROR("pthread_cond_wait failed consumer thread");
2068 }
2069 goto error;
2070 }
2071
2072 pthread_mutex_lock(&consumer_data->pid_mutex);
2073 if (consumer_data->pid == 0) {
2074 ERR("Consumerd did not start");
2075 pthread_mutex_unlock(&consumer_data->pid_mutex);
2076 goto error;
2077 }
2078 pthread_mutex_unlock(&consumer_data->pid_mutex);
2079
2080 return 0;
2081
2082 error:
2083 return ret;
2084 }
2085
2086 /*
2087 * Join consumer thread
2088 */
2089 static int join_consumer_thread(struct consumer_data *consumer_data)
2090 {
2091 void *status;
2092
2093 /* Consumer pid must be a real one. */
2094 if (consumer_data->pid > 0) {
2095 int ret;
2096 ret = kill(consumer_data->pid, SIGTERM);
2097 if (ret) {
2098 ERR("Error killing consumer daemon");
2099 return ret;
2100 }
2101 return pthread_join(consumer_data->thread, &status);
2102 } else {
2103 return 0;
2104 }
2105 }
2106
2107 /*
2108 * Fork and exec a consumer daemon (consumerd).
2109 *
2110 * Return pid if successful else -1.
2111 */
2112 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
2113 {
2114 int ret;
2115 pid_t pid;
2116 const char *consumer_to_use;
2117 const char *verbosity;
2118 struct stat st;
2119
2120 DBG("Spawning consumerd");
2121
2122 pid = fork();
2123 if (pid == 0) {
2124 /*
2125 * Exec consumerd.
2126 */
2127 if (opt_verbose_consumer) {
2128 verbosity = "--verbose";
2129 } else {
2130 verbosity = "--quiet";
2131 }
2132 switch (consumer_data->type) {
2133 case LTTNG_CONSUMER_KERNEL:
2134 /*
2135 * Find out which consumerd to execute. We will first try the
2136 * 64-bit path, then the sessiond's installation directory, and
2137 * fallback on the 32-bit one,
2138 */
2139 DBG3("Looking for a kernel consumer at these locations:");
2140 DBG3(" 1) %s", consumerd64_bin);
2141 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
2142 DBG3(" 3) %s", consumerd32_bin);
2143 if (stat(consumerd64_bin, &st) == 0) {
2144 DBG3("Found location #1");
2145 consumer_to_use = consumerd64_bin;
2146 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
2147 DBG3("Found location #2");
2148 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
2149 } else if (stat(consumerd32_bin, &st) == 0) {
2150 DBG3("Found location #3");
2151 consumer_to_use = consumerd32_bin;
2152 } else {
2153 DBG("Could not find any valid consumerd executable");
2154 break;
2155 }
2156 DBG("Using kernel consumer at: %s", consumer_to_use);
2157 execl(consumer_to_use,
2158 "lttng-consumerd", verbosity, "-k",
2159 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2160 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2161 "--group", tracing_group_name,
2162 NULL);
2163 break;
2164 case LTTNG_CONSUMER64_UST:
2165 {
2166 char *tmpnew = NULL;
2167
2168 if (consumerd64_libdir[0] != '\0') {
2169 char *tmp;
2170 size_t tmplen;
2171
2172 tmp = getenv("LD_LIBRARY_PATH");
2173 if (!tmp) {
2174 tmp = "";
2175 }
2176 tmplen = strlen("LD_LIBRARY_PATH=")
2177 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
2178 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2179 if (!tmpnew) {
2180 ret = -ENOMEM;
2181 goto error;
2182 }
2183 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2184 strcat(tmpnew, consumerd64_libdir);
2185 if (tmp[0] != '\0') {
2186 strcat(tmpnew, ":");
2187 strcat(tmpnew, tmp);
2188 }
2189 ret = putenv(tmpnew);
2190 if (ret) {
2191 ret = -errno;
2192 free(tmpnew);
2193 goto error;
2194 }
2195 }
2196 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
2197 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
2198 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2199 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2200 "--group", tracing_group_name,
2201 NULL);
2202 if (consumerd64_libdir[0] != '\0') {
2203 free(tmpnew);
2204 }
2205 if (ret) {
2206 goto error;
2207 }
2208 break;
2209 }
2210 case LTTNG_CONSUMER32_UST:
2211 {
2212 char *tmpnew = NULL;
2213
2214 if (consumerd32_libdir[0] != '\0') {
2215 char *tmp;
2216 size_t tmplen;
2217
2218 tmp = getenv("LD_LIBRARY_PATH");
2219 if (!tmp) {
2220 tmp = "";
2221 }
2222 tmplen = strlen("LD_LIBRARY_PATH=")
2223 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
2224 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2225 if (!tmpnew) {
2226 ret = -ENOMEM;
2227 goto error;
2228 }
2229 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2230 strcat(tmpnew, consumerd32_libdir);
2231 if (tmp[0] != '\0') {
2232 strcat(tmpnew, ":");
2233 strcat(tmpnew, tmp);
2234 }
2235 ret = putenv(tmpnew);
2236 if (ret) {
2237 ret = -errno;
2238 free(tmpnew);
2239 goto error;
2240 }
2241 }
2242 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
2243 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
2244 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2245 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2246 "--group", tracing_group_name,
2247 NULL);
2248 if (consumerd32_libdir[0] != '\0') {
2249 free(tmpnew);
2250 }
2251 if (ret) {
2252 goto error;
2253 }
2254 break;
2255 }
2256 default:
2257 PERROR("unknown consumer type");
2258 exit(EXIT_FAILURE);
2259 }
2260 if (errno != 0) {
2261 PERROR("kernel start consumer exec");
2262 }
2263 exit(EXIT_FAILURE);
2264 } else if (pid > 0) {
2265 ret = pid;
2266 } else {
2267 PERROR("start consumer fork");
2268 ret = -errno;
2269 }
2270 error:
2271 return ret;
2272 }
2273
2274 /*
2275 * Spawn the consumerd daemon and session daemon thread.
2276 */
2277 static int start_consumerd(struct consumer_data *consumer_data)
2278 {
2279 int ret;
2280
2281 /*
2282 * Set the listen() state on the socket since there is a possible race
2283 * between the exec() of the consumer daemon and this call if place in the
2284 * consumer thread. See bug #366 for more details.
2285 */
2286 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2287 if (ret < 0) {
2288 goto error;
2289 }
2290
2291 pthread_mutex_lock(&consumer_data->pid_mutex);
2292 if (consumer_data->pid != 0) {
2293 pthread_mutex_unlock(&consumer_data->pid_mutex);
2294 goto end;
2295 }
2296
2297 ret = spawn_consumerd(consumer_data);
2298 if (ret < 0) {
2299 ERR("Spawning consumerd failed");
2300 pthread_mutex_unlock(&consumer_data->pid_mutex);
2301 goto error;
2302 }
2303
2304 /* Setting up the consumer_data pid */
2305 consumer_data->pid = ret;
2306 DBG2("Consumer pid %d", consumer_data->pid);
2307 pthread_mutex_unlock(&consumer_data->pid_mutex);
2308
2309 DBG2("Spawning consumer control thread");
2310 ret = spawn_consumer_thread(consumer_data);
2311 if (ret < 0) {
2312 ERR("Fatal error spawning consumer control thread");
2313 goto error;
2314 }
2315
2316 end:
2317 return 0;
2318
2319 error:
2320 /* Cleanup already created sockets on error. */
2321 if (consumer_data->err_sock >= 0) {
2322 int err;
2323
2324 err = close(consumer_data->err_sock);
2325 if (err < 0) {
2326 PERROR("close consumer data error socket");
2327 }
2328 }
2329 return ret;
2330 }
2331
2332 /*
2333 * Setup necessary data for kernel tracer action.
2334 */
2335 static int init_kernel_tracer(void)
2336 {
2337 int ret;
2338
2339 /* Modprobe lttng kernel modules */
2340 ret = modprobe_lttng_control();
2341 if (ret < 0) {
2342 goto error;
2343 }
2344
2345 /* Open debugfs lttng */
2346 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2347 if (kernel_tracer_fd < 0) {
2348 DBG("Failed to open %s", module_proc_lttng);
2349 ret = -1;
2350 goto error_open;
2351 }
2352
2353 /* Validate kernel version */
2354 ret = kernel_validate_version(kernel_tracer_fd);
2355 if (ret < 0) {
2356 goto error_version;
2357 }
2358
2359 ret = modprobe_lttng_data();
2360 if (ret < 0) {
2361 goto error_modules;
2362 }
2363
2364 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2365 return 0;
2366
2367 error_version:
2368 modprobe_remove_lttng_control();
2369 ret = close(kernel_tracer_fd);
2370 if (ret) {
2371 PERROR("close");
2372 }
2373 kernel_tracer_fd = -1;
2374 return LTTNG_ERR_KERN_VERSION;
2375
2376 error_modules:
2377 ret = close(kernel_tracer_fd);
2378 if (ret) {
2379 PERROR("close");
2380 }
2381
2382 error_open:
2383 modprobe_remove_lttng_control();
2384
2385 error:
2386 WARN("No kernel tracer available");
2387 kernel_tracer_fd = -1;
2388 if (!is_root) {
2389 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2390 } else {
2391 return LTTNG_ERR_KERN_NA;
2392 }
2393 }
2394
2395
2396 /*
2397 * Copy consumer output from the tracing session to the domain session. The
2398 * function also applies the right modification on a per domain basis for the
2399 * trace files destination directory.
2400 *
2401 * Should *NOT* be called with RCU read-side lock held.
2402 */
2403 static int copy_session_consumer(int domain, struct ltt_session *session)
2404 {
2405 int ret;
2406 const char *dir_name;
2407 struct consumer_output *consumer;
2408
2409 assert(session);
2410 assert(session->consumer);
2411
2412 switch (domain) {
2413 case LTTNG_DOMAIN_KERNEL:
2414 DBG3("Copying tracing session consumer output in kernel session");
2415 /*
2416 * XXX: We should audit the session creation and what this function
2417 * does "extra" in order to avoid a destroy since this function is used
2418 * in the domain session creation (kernel and ust) only. Same for UST
2419 * domain.
2420 */
2421 if (session->kernel_session->consumer) {
2422 consumer_destroy_output(session->kernel_session->consumer);
2423 }
2424 session->kernel_session->consumer =
2425 consumer_copy_output(session->consumer);
2426 /* Ease our life a bit for the next part */
2427 consumer = session->kernel_session->consumer;
2428 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2429 break;
2430 case LTTNG_DOMAIN_JUL:
2431 case LTTNG_DOMAIN_UST:
2432 DBG3("Copying tracing session consumer output in UST session");
2433 if (session->ust_session->consumer) {
2434 consumer_destroy_output(session->ust_session->consumer);
2435 }
2436 session->ust_session->consumer =
2437 consumer_copy_output(session->consumer);
2438 /* Ease our life a bit for the next part */
2439 consumer = session->ust_session->consumer;
2440 dir_name = DEFAULT_UST_TRACE_DIR;
2441 break;
2442 default:
2443 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2444 goto error;
2445 }
2446
2447 /* Append correct directory to subdir */
2448 strncat(consumer->subdir, dir_name,
2449 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2450 DBG3("Copy session consumer subdir %s", consumer->subdir);
2451
2452 ret = LTTNG_OK;
2453
2454 error:
2455 return ret;
2456 }
2457
2458 /*
2459 * Create an UST session and add it to the session ust list.
2460 *
2461 * Should *NOT* be called with RCU read-side lock held.
2462 */
2463 static int create_ust_session(struct ltt_session *session,
2464 struct lttng_domain *domain)
2465 {
2466 int ret;
2467 struct ltt_ust_session *lus = NULL;
2468
2469 assert(session);
2470 assert(domain);
2471 assert(session->consumer);
2472
2473 switch (domain->type) {
2474 case LTTNG_DOMAIN_JUL:
2475 case LTTNG_DOMAIN_UST:
2476 break;
2477 default:
2478 ERR("Unknown UST domain on create session %d", domain->type);
2479 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2480 goto error;
2481 }
2482
2483 DBG("Creating UST session");
2484
2485 lus = trace_ust_create_session(session->id);
2486 if (lus == NULL) {
2487 ret = LTTNG_ERR_UST_SESS_FAIL;
2488 goto error;
2489 }
2490
2491 lus->uid = session->uid;
2492 lus->gid = session->gid;
2493 lus->output_traces = session->output_traces;
2494 lus->snapshot_mode = session->snapshot_mode;
2495 lus->live_timer_interval = session->live_timer;
2496 session->ust_session = lus;
2497
2498 /* Copy session output to the newly created UST session */
2499 ret = copy_session_consumer(domain->type, session);
2500 if (ret != LTTNG_OK) {
2501 goto error;
2502 }
2503
2504 return LTTNG_OK;
2505
2506 error:
2507 free(lus);
2508 session->ust_session = NULL;
2509 return ret;
2510 }
2511
2512 /*
2513 * Create a kernel tracer session then create the default channel.
2514 */
2515 static int create_kernel_session(struct ltt_session *session)
2516 {
2517 int ret;
2518
2519 DBG("Creating kernel session");
2520
2521 ret = kernel_create_session(session, kernel_tracer_fd);
2522 if (ret < 0) {
2523 ret = LTTNG_ERR_KERN_SESS_FAIL;
2524 goto error;
2525 }
2526
2527 /* Code flow safety */
2528 assert(session->kernel_session);
2529
2530 /* Copy session output to the newly created Kernel session */
2531 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2532 if (ret != LTTNG_OK) {
2533 goto error;
2534 }
2535
2536 /* Create directory(ies) on local filesystem. */
2537 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2538 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2539 ret = run_as_mkdir_recursive(
2540 session->kernel_session->consumer->dst.trace_path,
2541 S_IRWXU | S_IRWXG, session->uid, session->gid);
2542 if (ret < 0) {
2543 if (ret != -EEXIST) {
2544 ERR("Trace directory creation error");
2545 goto error;
2546 }
2547 }
2548 }
2549
2550 session->kernel_session->uid = session->uid;
2551 session->kernel_session->gid = session->gid;
2552 session->kernel_session->output_traces = session->output_traces;
2553 session->kernel_session->snapshot_mode = session->snapshot_mode;
2554
2555 return LTTNG_OK;
2556
2557 error:
2558 trace_kernel_destroy_session(session->kernel_session);
2559 session->kernel_session = NULL;
2560 return ret;
2561 }
2562
2563 /*
2564 * Count number of session permitted by uid/gid.
2565 */
2566 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2567 {
2568 unsigned int i = 0;
2569 struct ltt_session *session;
2570
2571 DBG("Counting number of available session for UID %d GID %d",
2572 uid, gid);
2573 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2574 /*
2575 * Only list the sessions the user can control.
2576 */
2577 if (!session_access_ok(session, uid, gid)) {
2578 continue;
2579 }
2580 i++;
2581 }
2582 return i;
2583 }
2584
2585 /*
2586 * Process the command requested by the lttng client within the command
2587 * context structure. This function make sure that the return structure (llm)
2588 * is set and ready for transmission before returning.
2589 *
2590 * Return any error encountered or 0 for success.
2591 *
2592 * "sock" is only used for special-case var. len data.
2593 *
2594 * Should *NOT* be called with RCU read-side lock held.
2595 */
2596 static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2597 int *sock_error)
2598 {
2599 int ret = LTTNG_OK;
2600 int need_tracing_session = 1;
2601 int need_domain;
2602
2603 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2604
2605 *sock_error = 0;
2606
2607 switch (cmd_ctx->lsm->cmd_type) {
2608 case LTTNG_CREATE_SESSION:
2609 case LTTNG_CREATE_SESSION_SNAPSHOT:
2610 case LTTNG_CREATE_SESSION_LIVE:
2611 case LTTNG_DESTROY_SESSION:
2612 case LTTNG_LIST_SESSIONS:
2613 case LTTNG_LIST_DOMAINS:
2614 case LTTNG_START_TRACE:
2615 case LTTNG_STOP_TRACE:
2616 case LTTNG_DATA_PENDING:
2617 case LTTNG_SNAPSHOT_ADD_OUTPUT:
2618 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2619 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2620 case LTTNG_SNAPSHOT_RECORD:
2621 need_domain = 0;
2622 break;
2623 default:
2624 need_domain = 1;
2625 }
2626
2627 if (opt_no_kernel && need_domain
2628 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
2629 if (!is_root) {
2630 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2631 } else {
2632 ret = LTTNG_ERR_KERN_NA;
2633 }
2634 goto error;
2635 }
2636
2637 /* Deny register consumer if we already have a spawned consumer. */
2638 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2639 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2640 if (kconsumer_data.pid > 0) {
2641 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2642 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2643 goto error;
2644 }
2645 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2646 }
2647
2648 /*
2649 * Check for command that don't needs to allocate a returned payload. We do
2650 * this here so we don't have to make the call for no payload at each
2651 * command.
2652 */
2653 switch(cmd_ctx->lsm->cmd_type) {
2654 case LTTNG_LIST_SESSIONS:
2655 case LTTNG_LIST_TRACEPOINTS:
2656 case LTTNG_LIST_TRACEPOINT_FIELDS:
2657 case LTTNG_LIST_DOMAINS:
2658 case LTTNG_LIST_CHANNELS:
2659 case LTTNG_LIST_EVENTS:
2660 break;
2661 default:
2662 /* Setup lttng message with no payload */
2663 ret = setup_lttng_msg(cmd_ctx, 0);
2664 if (ret < 0) {
2665 /* This label does not try to unlock the session */
2666 goto init_setup_error;
2667 }
2668 }
2669
2670 /* Commands that DO NOT need a session. */
2671 switch (cmd_ctx->lsm->cmd_type) {
2672 case LTTNG_CREATE_SESSION:
2673 case LTTNG_CREATE_SESSION_SNAPSHOT:
2674 case LTTNG_CREATE_SESSION_LIVE:
2675 case LTTNG_CALIBRATE:
2676 case LTTNG_LIST_SESSIONS:
2677 case LTTNG_LIST_TRACEPOINTS:
2678 case LTTNG_LIST_TRACEPOINT_FIELDS:
2679 need_tracing_session = 0;
2680 break;
2681 default:
2682 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2683 /*
2684 * We keep the session list lock across _all_ commands
2685 * for now, because the per-session lock does not
2686 * handle teardown properly.
2687 */
2688 session_lock_list();
2689 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2690 if (cmd_ctx->session == NULL) {
2691 ret = LTTNG_ERR_SESS_NOT_FOUND;
2692 goto error;
2693 } else {
2694 /* Acquire lock for the session */
2695 session_lock(cmd_ctx->session);
2696 }
2697 break;
2698 }
2699
2700 if (!need_domain) {
2701 goto skip_domain;
2702 }
2703
2704 /*
2705 * Check domain type for specific "pre-action".
2706 */
2707 switch (cmd_ctx->lsm->domain.type) {
2708 case LTTNG_DOMAIN_KERNEL:
2709 if (!is_root) {
2710 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2711 goto error;
2712 }
2713
2714 /* Kernel tracer check */
2715 if (kernel_tracer_fd == -1) {
2716 /* Basically, load kernel tracer modules */
2717 ret = init_kernel_tracer();
2718 if (ret != 0) {
2719 goto error;
2720 }
2721 }
2722
2723 /* Consumer is in an ERROR state. Report back to client */
2724 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
2725 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2726 goto error;
2727 }
2728
2729 /* Need a session for kernel command */
2730 if (need_tracing_session) {
2731 if (cmd_ctx->session->kernel_session == NULL) {
2732 ret = create_kernel_session(cmd_ctx->session);
2733 if (ret < 0) {
2734 ret = LTTNG_ERR_KERN_SESS_FAIL;
2735 goto error;
2736 }
2737 }
2738
2739 /* Start the kernel consumer daemon */
2740 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2741 if (kconsumer_data.pid == 0 &&
2742 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2743 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2744 ret = start_consumerd(&kconsumer_data);
2745 if (ret < 0) {
2746 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2747 goto error;
2748 }
2749 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
2750 } else {
2751 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2752 }
2753
2754 /*
2755 * The consumer was just spawned so we need to add the socket to
2756 * the consumer output of the session if exist.
2757 */
2758 ret = consumer_create_socket(&kconsumer_data,
2759 cmd_ctx->session->kernel_session->consumer);
2760 if (ret < 0) {
2761 goto error;
2762 }
2763 }
2764
2765 break;
2766 case LTTNG_DOMAIN_JUL:
2767 case LTTNG_DOMAIN_UST:
2768 {
2769 if (!ust_app_supported()) {
2770 ret = LTTNG_ERR_NO_UST;
2771 goto error;
2772 }
2773 /* Consumer is in an ERROR state. Report back to client */
2774 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
2775 ret = LTTNG_ERR_NO_USTCONSUMERD;
2776 goto error;
2777 }
2778
2779 if (need_tracing_session) {
2780 /* Create UST session if none exist. */
2781 if (cmd_ctx->session->ust_session == NULL) {
2782 ret = create_ust_session(cmd_ctx->session,
2783 &cmd_ctx->lsm->domain);
2784 if (ret != LTTNG_OK) {
2785 goto error;
2786 }
2787 }
2788
2789 /* Start the UST consumer daemons */
2790 /* 64-bit */
2791 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
2792 if (consumerd64_bin[0] != '\0' &&
2793 ustconsumer64_data.pid == 0 &&
2794 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2795 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2796 ret = start_consumerd(&ustconsumer64_data);
2797 if (ret < 0) {
2798 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
2799 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2800 goto error;
2801 }
2802
2803 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
2804 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2805 } else {
2806 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2807 }
2808
2809 /*
2810 * Setup socket for consumer 64 bit. No need for atomic access
2811 * since it was set above and can ONLY be set in this thread.
2812 */
2813 ret = consumer_create_socket(&ustconsumer64_data,
2814 cmd_ctx->session->ust_session->consumer);
2815 if (ret < 0) {
2816 goto error;
2817 }
2818
2819 /* 32-bit */
2820 if (consumerd32_bin[0] != '\0' &&
2821 ustconsumer32_data.pid == 0 &&
2822 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2823 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2824 ret = start_consumerd(&ustconsumer32_data);
2825 if (ret < 0) {
2826 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
2827 uatomic_set(&ust_consumerd32_fd, -EINVAL);
2828 goto error;
2829 }
2830
2831 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
2832 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2833 } else {
2834 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2835 }
2836
2837 /*
2838 * Setup socket for consumer 64 bit. No need for atomic access
2839 * since it was set above and can ONLY be set in this thread.
2840 */
2841 ret = consumer_create_socket(&ustconsumer32_data,
2842 cmd_ctx->session->ust_session->consumer);
2843 if (ret < 0) {
2844 goto error;
2845 }
2846 }
2847 break;
2848 }
2849 default:
2850 break;
2851 }
2852 skip_domain:
2853
2854 /* Validate consumer daemon state when start/stop trace command */
2855 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2856 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2857 switch (cmd_ctx->lsm->domain.type) {
2858 case LTTNG_DOMAIN_JUL:
2859 case LTTNG_DOMAIN_UST:
2860 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
2861 ret = LTTNG_ERR_NO_USTCONSUMERD;
2862 goto error;
2863 }
2864 break;
2865 case LTTNG_DOMAIN_KERNEL:
2866 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
2867 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2868 goto error;
2869 }
2870 break;
2871 }
2872 }
2873
2874 /*
2875 * Check that the UID or GID match that of the tracing session.
2876 * The root user can interact with all sessions.
2877 */
2878 if (need_tracing_session) {
2879 if (!session_access_ok(cmd_ctx->session,
2880 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2881 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
2882 ret = LTTNG_ERR_EPERM;
2883 goto error;
2884 }
2885 }
2886
2887 /*
2888 * Send relayd information to consumer as soon as we have a domain and a
2889 * session defined.
2890 */
2891 if (cmd_ctx->session && need_domain) {
2892 /*
2893 * Setup relayd if not done yet. If the relayd information was already
2894 * sent to the consumer, this call will gracefully return.
2895 */
2896 ret = cmd_setup_relayd(cmd_ctx->session);
2897 if (ret != LTTNG_OK) {
2898 goto error;
2899 }
2900 }
2901
2902 /* Process by command type */
2903 switch (cmd_ctx->lsm->cmd_type) {
2904 case LTTNG_ADD_CONTEXT:
2905 {
2906 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2907 cmd_ctx->lsm->u.context.channel_name,
2908 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
2909 break;
2910 }
2911 case LTTNG_DISABLE_CHANNEL:
2912 {
2913 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2914 cmd_ctx->lsm->u.disable.channel_name);
2915 break;
2916 }
2917 case LTTNG_DISABLE_EVENT:
2918 {
2919 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2920 cmd_ctx->lsm->u.disable.channel_name,
2921 cmd_ctx->lsm->u.disable.name);
2922 break;
2923 }
2924 case LTTNG_DISABLE_ALL_EVENT:
2925 {
2926 DBG("Disabling all events");
2927
2928 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2929 cmd_ctx->lsm->u.disable.channel_name);
2930 break;
2931 }
2932 case LTTNG_ENABLE_CHANNEL:
2933 {
2934 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
2935 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
2936 break;
2937 }
2938 case LTTNG_ENABLE_EVENT:
2939 {
2940 struct lttng_event_exclusion *exclusion = NULL;
2941 struct lttng_filter_bytecode *bytecode = NULL;
2942
2943 /* Handle exclusion events and receive it from the client. */
2944 if (cmd_ctx->lsm->u.enable.exclusion_count > 0) {
2945 size_t count = cmd_ctx->lsm->u.enable.exclusion_count;
2946
2947 exclusion = zmalloc(sizeof(struct lttng_event_exclusion) +
2948 (count * LTTNG_SYMBOL_NAME_LEN));
2949 if (!exclusion) {
2950 ret = LTTNG_ERR_EXCLUSION_NOMEM;
2951 goto error;
2952 }
2953
2954 DBG("Receiving var len exclusion event list from client ...");
2955 exclusion->count = count;
2956 ret = lttcomm_recv_unix_sock(sock, exclusion->names,
2957 count * LTTNG_SYMBOL_NAME_LEN);
2958 if (ret <= 0) {
2959 DBG("Nothing recv() from client var len data... continuing");
2960 *sock_error = 1;
2961 free(exclusion);
2962 ret = LTTNG_ERR_EXCLUSION_INVAL;
2963 goto error;
2964 }
2965 }
2966
2967 /* Handle filter and get bytecode from client. */
2968 if (cmd_ctx->lsm->u.enable.bytecode_len > 0) {
2969 size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len;
2970
2971 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
2972 ret = LTTNG_ERR_FILTER_INVAL;
2973 free(exclusion);
2974 goto error;
2975 }
2976
2977 bytecode = zmalloc(bytecode_len);
2978 if (!bytecode) {
2979 free(exclusion);
2980 ret = LTTNG_ERR_FILTER_NOMEM;
2981 goto error;
2982 }
2983
2984 /* Receive var. len. data */
2985 DBG("Receiving var len filter's bytecode from client ...");
2986 ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
2987 if (ret <= 0) {
2988 DBG("Nothing recv() from client car len data... continuing");
2989 *sock_error = 1;
2990 free(bytecode);
2991 free(exclusion);
2992 ret = LTTNG_ERR_FILTER_INVAL;
2993 goto error;
2994 }
2995
2996 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
2997 free(bytecode);
2998 free(exclusion);
2999 ret = LTTNG_ERR_FILTER_INVAL;
3000 goto error;
3001 }
3002 }
3003
3004 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3005 cmd_ctx->lsm->u.enable.channel_name,
3006 &cmd_ctx->lsm->u.enable.event, bytecode, exclusion,
3007 kernel_poll_pipe[1]);
3008 break;
3009 }
3010 case LTTNG_ENABLE_ALL_EVENT:
3011 {
3012 DBG("Enabling all events");
3013
3014 ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain,
3015 cmd_ctx->lsm->u.enable.channel_name,
3016 cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]);
3017 break;
3018 }
3019 case LTTNG_LIST_TRACEPOINTS:
3020 {
3021 struct lttng_event *events;
3022 ssize_t nb_events;
3023
3024 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3025 if (nb_events < 0) {
3026 /* Return value is a negative lttng_error_code. */
3027 ret = -nb_events;
3028 goto error;
3029 }
3030
3031 /*
3032 * Setup lttng message with payload size set to the event list size in
3033 * bytes and then copy list into the llm payload.
3034 */
3035 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3036 if (ret < 0) {
3037 free(events);
3038 goto setup_error;
3039 }
3040
3041 /* Copy event list into message payload */
3042 memcpy(cmd_ctx->llm->payload, events,
3043 sizeof(struct lttng_event) * nb_events);
3044
3045 free(events);
3046
3047 ret = LTTNG_OK;
3048 break;
3049 }
3050 case LTTNG_LIST_TRACEPOINT_FIELDS:
3051 {
3052 struct lttng_event_field *fields;
3053 ssize_t nb_fields;
3054
3055 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
3056 &fields);
3057 if (nb_fields < 0) {
3058 /* Return value is a negative lttng_error_code. */
3059 ret = -nb_fields;
3060 goto error;
3061 }
3062
3063 /*
3064 * Setup lttng message with payload size set to the event list size in
3065 * bytes and then copy list into the llm payload.
3066 */
3067 ret = setup_lttng_msg(cmd_ctx,
3068 sizeof(struct lttng_event_field) * nb_fields);
3069 if (ret < 0) {
3070 free(fields);
3071 goto setup_error;
3072 }
3073
3074 /* Copy event list into message payload */
3075 memcpy(cmd_ctx->llm->payload, fields,
3076 sizeof(struct lttng_event_field) * nb_fields);
3077
3078 free(fields);
3079
3080 ret = LTTNG_OK;
3081 break;
3082 }
3083 case LTTNG_SET_CONSUMER_URI:
3084 {
3085 size_t nb_uri, len;
3086 struct lttng_uri *uris;
3087
3088 nb_uri = cmd_ctx->lsm->u.uri.size;
3089 len = nb_uri * sizeof(struct lttng_uri);
3090
3091 if (nb_uri == 0) {
3092 ret = LTTNG_ERR_INVALID;
3093 goto error;
3094 }
3095
3096 uris = zmalloc(len);
3097 if (uris == NULL) {
3098 ret = LTTNG_ERR_FATAL;
3099 goto error;
3100 }
3101
3102 /* Receive variable len data */
3103 DBG("Receiving %zu URI(s) from client ...", nb_uri);
3104 ret = lttcomm_recv_unix_sock(sock, uris, len);
3105 if (ret <= 0) {
3106 DBG("No URIs received from client... continuing");
3107 *sock_error = 1;
3108 ret = LTTNG_ERR_SESSION_FAIL;
3109 free(uris);
3110 goto error;
3111 }
3112
3113 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3114 nb_uri, uris);
3115 if (ret != LTTNG_OK) {
3116 free(uris);
3117 goto error;
3118 }
3119
3120 /*
3121 * XXX: 0 means that this URI should be applied on the session. Should
3122 * be a DOMAIN enuam.
3123 */
3124 if (cmd_ctx->lsm->domain.type == 0) {
3125 /* Add the URI for the UST session if a consumer is present. */
3126 if (cmd_ctx->session->ust_session &&
3127 cmd_ctx->session->ust_session->consumer) {
3128 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
3129 nb_uri, uris);
3130 } else if (cmd_ctx->session->kernel_session &&
3131 cmd_ctx->session->kernel_session->consumer) {
3132 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
3133 cmd_ctx->session, nb_uri, uris);
3134 }
3135 }
3136
3137 free(uris);
3138
3139 break;
3140 }
3141 case LTTNG_START_TRACE:
3142 {
3143 ret = cmd_start_trace(cmd_ctx->session);
3144 break;
3145 }
3146 case LTTNG_STOP_TRACE:
3147 {
3148 ret = cmd_stop_trace(cmd_ctx->session);
3149 break;
3150 }
3151 case LTTNG_CREATE_SESSION:
3152 {
3153 size_t nb_uri, len;
3154 struct lttng_uri *uris = NULL;
3155
3156 nb_uri = cmd_ctx->lsm->u.uri.size;
3157 len = nb_uri * sizeof(struct lttng_uri);
3158
3159 if (nb_uri > 0) {
3160 uris = zmalloc(len);
3161 if (uris == NULL) {
3162 ret = LTTNG_ERR_FATAL;
3163 goto error;
3164 }
3165
3166 /* Receive variable len data */
3167 DBG("Waiting for %zu URIs from client ...", nb_uri);
3168 ret = lttcomm_recv_unix_sock(sock, uris, len);
3169 if (ret <= 0) {
3170 DBG("No URIs received from client... continuing");
3171 *sock_error = 1;
3172 ret = LTTNG_ERR_SESSION_FAIL;
3173 free(uris);
3174 goto error;
3175 }
3176
3177 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3178 DBG("Creating session with ONE network URI is a bad call");
3179 ret = LTTNG_ERR_SESSION_FAIL;
3180 free(uris);
3181 goto error;
3182 }
3183 }
3184
3185 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
3186 &cmd_ctx->creds, 0);
3187
3188 free(uris);
3189
3190 break;
3191 }
3192 case LTTNG_DESTROY_SESSION:
3193 {
3194 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
3195
3196 /* Set session to NULL so we do not unlock it after free. */
3197 cmd_ctx->session = NULL;
3198 break;
3199 }
3200 case LTTNG_LIST_DOMAINS:
3201 {
3202 ssize_t nb_dom;
3203 struct lttng_domain *domains;
3204
3205 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3206 if (nb_dom < 0) {
3207 /* Return value is a negative lttng_error_code. */
3208 ret = -nb_dom;
3209 goto error;
3210 }
3211
3212 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3213 if (ret < 0) {
3214 free(domains);
3215 goto setup_error;
3216 }
3217
3218 /* Copy event list into message payload */
3219 memcpy(cmd_ctx->llm->payload, domains,
3220 nb_dom * sizeof(struct lttng_domain));
3221
3222 free(domains);
3223
3224 ret = LTTNG_OK;
3225 break;
3226 }
3227 case LTTNG_LIST_CHANNELS:
3228 {
3229 int nb_chan;
3230 struct lttng_channel *channels;
3231
3232 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3233 cmd_ctx->session, &channels);
3234 if (nb_chan < 0) {
3235 /* Return value is a negative lttng_error_code. */
3236 ret = -nb_chan;
3237 goto error;
3238 }
3239
3240 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3241 if (ret < 0) {
3242 free(channels);
3243 goto setup_error;
3244 }
3245
3246 /* Copy event list into message payload */
3247 memcpy(cmd_ctx->llm->payload, channels,
3248 nb_chan * sizeof(struct lttng_channel));
3249
3250 free(channels);
3251
3252 ret = LTTNG_OK;
3253 break;
3254 }
3255 case LTTNG_LIST_EVENTS:
3256 {
3257 ssize_t nb_event;
3258 struct lttng_event *events = NULL;
3259
3260 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3261 cmd_ctx->lsm->u.list.channel_name, &events);
3262 if (nb_event < 0) {
3263 /* Return value is a negative lttng_error_code. */
3264 ret = -nb_event;
3265 goto error;
3266 }
3267
3268 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3269 if (ret < 0) {
3270 free(events);
3271 goto setup_error;
3272 }
3273
3274 /* Copy event list into message payload */
3275 memcpy(cmd_ctx->llm->payload, events,
3276 nb_event * sizeof(struct lttng_event));
3277
3278 free(events);
3279
3280 ret = LTTNG_OK;
3281 break;
3282 }
3283 case LTTNG_LIST_SESSIONS:
3284 {
3285 unsigned int nr_sessions;
3286
3287 session_lock_list();
3288 nr_sessions = lttng_sessions_count(
3289 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3290 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3291
3292 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3293 if (ret < 0) {
3294 session_unlock_list();
3295 goto setup_error;
3296 }
3297
3298 /* Filled the session array */
3299 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3300 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3301 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3302
3303 session_unlock_list();
3304
3305 ret = LTTNG_OK;
3306 break;
3307 }
3308 case LTTNG_CALIBRATE:
3309 {
3310 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3311 &cmd_ctx->lsm->u.calibrate);
3312 break;
3313 }
3314 case LTTNG_REGISTER_CONSUMER:
3315 {
3316 struct consumer_data *cdata;
3317
3318 switch (cmd_ctx->lsm->domain.type) {
3319 case LTTNG_DOMAIN_KERNEL:
3320 cdata = &kconsumer_data;
3321 break;
3322 default:
3323 ret = LTTNG_ERR_UND;
3324 goto error;
3325 }
3326
3327 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3328 cmd_ctx->lsm->u.reg.path, cdata);
3329 break;
3330 }
3331 case LTTNG_DATA_PENDING:
3332 {
3333 ret = cmd_data_pending(cmd_ctx->session);
3334 break;
3335 }
3336 case LTTNG_SNAPSHOT_ADD_OUTPUT:
3337 {
3338 struct lttcomm_lttng_output_id reply;
3339
3340 ret = cmd_snapshot_add_output(cmd_ctx->session,
3341 &cmd_ctx->lsm->u.snapshot_output.output, &reply.id);
3342 if (ret != LTTNG_OK) {
3343 goto error;
3344 }
3345
3346 ret = setup_lttng_msg(cmd_ctx, sizeof(reply));
3347 if (ret < 0) {
3348 goto setup_error;
3349 }
3350
3351 /* Copy output list into message payload */
3352 memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply));
3353 ret = LTTNG_OK;
3354 break;
3355 }
3356 case LTTNG_SNAPSHOT_DEL_OUTPUT:
3357 {
3358 ret = cmd_snapshot_del_output(cmd_ctx->session,
3359 &cmd_ctx->lsm->u.snapshot_output.output);
3360 break;
3361 }
3362 case LTTNG_SNAPSHOT_LIST_OUTPUT:
3363 {
3364 ssize_t nb_output;
3365 struct lttng_snapshot_output *outputs = NULL;
3366
3367 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
3368 if (nb_output < 0) {
3369 ret = -nb_output;
3370 goto error;
3371 }
3372
3373 ret = setup_lttng_msg(cmd_ctx,
3374 nb_output * sizeof(struct lttng_snapshot_output));
3375 if (ret < 0) {
3376 free(outputs);
3377 goto setup_error;
3378 }
3379
3380 if (outputs) {
3381 /* Copy output list into message payload */
3382 memcpy(cmd_ctx->llm->payload, outputs,
3383 nb_output * sizeof(struct lttng_snapshot_output));
3384 free(outputs);
3385 }
3386
3387 ret = LTTNG_OK;
3388 break;
3389 }
3390 case LTTNG_SNAPSHOT_RECORD:
3391 {
3392 ret = cmd_snapshot_record(cmd_ctx->session,
3393 &cmd_ctx->lsm->u.snapshot_record.output,
3394 cmd_ctx->lsm->u.snapshot_record.wait);
3395 break;
3396 }
3397 case LTTNG_CREATE_SESSION_SNAPSHOT:
3398 {
3399 size_t nb_uri, len;
3400 struct lttng_uri *uris = NULL;
3401
3402 nb_uri = cmd_ctx->lsm->u.uri.size;
3403 len = nb_uri * sizeof(struct lttng_uri);
3404
3405 if (nb_uri > 0) {
3406 uris = zmalloc(len);
3407 if (uris == NULL) {
3408 ret = LTTNG_ERR_FATAL;
3409 goto error;
3410 }
3411
3412 /* Receive variable len data */
3413 DBG("Waiting for %zu URIs from client ...", nb_uri);
3414 ret = lttcomm_recv_unix_sock(sock, uris, len);
3415 if (ret <= 0) {
3416 DBG("No URIs received from client... continuing");
3417 *sock_error = 1;
3418 ret = LTTNG_ERR_SESSION_FAIL;
3419 free(uris);
3420 goto error;
3421 }
3422
3423 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3424 DBG("Creating session with ONE network URI is a bad call");
3425 ret = LTTNG_ERR_SESSION_FAIL;
3426 free(uris);
3427 goto error;
3428 }
3429 }
3430
3431 ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris,
3432 nb_uri, &cmd_ctx->creds);
3433 free(uris);
3434 break;
3435 }
3436 case LTTNG_CREATE_SESSION_LIVE:
3437 {
3438 size_t nb_uri, len;
3439 struct lttng_uri *uris = NULL;
3440
3441 nb_uri = cmd_ctx->lsm->u.uri.size;
3442 len = nb_uri * sizeof(struct lttng_uri);
3443
3444 if (nb_uri > 0) {
3445 uris = zmalloc(len);
3446 if (uris == NULL) {
3447 ret = LTTNG_ERR_FATAL;
3448 goto error;
3449 }
3450
3451 /* Receive variable len data */
3452 DBG("Waiting for %zu URIs from client ...", nb_uri);
3453 ret = lttcomm_recv_unix_sock(sock, uris, len);
3454 if (ret <= 0) {
3455 DBG("No URIs received from client... continuing");
3456 *sock_error = 1;
3457 ret = LTTNG_ERR_SESSION_FAIL;
3458 free(uris);
3459 goto error;
3460 }
3461
3462 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3463 DBG("Creating session with ONE network URI is a bad call");
3464 ret = LTTNG_ERR_SESSION_FAIL;
3465 free(uris);
3466 goto error;
3467 }
3468 }
3469
3470 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris,
3471 nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval);
3472 free(uris);
3473 break;
3474 }
3475 default:
3476 ret = LTTNG_ERR_UND;
3477 break;
3478 }
3479
3480 error:
3481 if (cmd_ctx->llm == NULL) {
3482 DBG("Missing llm structure. Allocating one.");
3483 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3484 goto setup_error;
3485 }
3486 }
3487 /* Set return code */
3488 cmd_ctx->llm->ret_code = ret;
3489 setup_error:
3490 if (cmd_ctx->session) {
3491 session_unlock(cmd_ctx->session);
3492 }
3493 if (need_tracing_session) {
3494 session_unlock_list();
3495 }
3496 init_setup_error:
3497 return ret;
3498 }
3499
3500 /*
3501 * Thread managing health check socket.
3502 */
3503 static void *thread_manage_health(void *data)
3504 {
3505 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
3506 uint32_t revents, nb_fd;
3507 struct lttng_poll_event events;
3508 struct health_comm_msg msg;
3509 struct health_comm_reply reply;
3510
3511 DBG("[thread] Manage health check started");
3512
3513 rcu_register_thread();
3514
3515 /* We might hit an error path before this is created. */
3516 lttng_poll_init(&events);
3517
3518 /* Create unix socket */
3519 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3520 if (sock < 0) {
3521 ERR("Unable to create health check Unix socket");
3522 ret = -1;
3523 goto error;
3524 }
3525
3526 if (is_root) {
3527 /* lttng health client socket path permissions */
3528 ret = chown(health_unix_sock_path, 0,
3529 utils_get_group_id(tracing_group_name));
3530 if (ret < 0) {
3531 ERR("Unable to set group on %s", health_unix_sock_path);
3532 PERROR("chown");
3533 ret = -1;
3534 goto error;
3535 }
3536
3537 ret = chmod(health_unix_sock_path,
3538 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3539 if (ret < 0) {
3540 ERR("Unable to set permissions on %s", health_unix_sock_path);
3541 PERROR("chmod");
3542 ret = -1;
3543 goto error;
3544 }
3545 }
3546
3547 /*
3548 * Set the CLOEXEC flag. Return code is useless because either way, the
3549 * show must go on.
3550 */
3551 (void) utils_set_fd_cloexec(sock);
3552
3553 ret = lttcomm_listen_unix_sock(sock);
3554 if (ret < 0) {
3555 goto error;
3556 }
3557
3558 /*
3559 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3560 * more will be added to this poll set.
3561 */
3562 ret = sessiond_set_thread_pollset(&events, 2);
3563 if (ret < 0) {
3564 goto error;
3565 }
3566
3567 /* Add the application registration socket */
3568 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3569 if (ret < 0) {
3570 goto error;
3571 }
3572
3573 while (1) {
3574 DBG("Health check ready");
3575
3576 /* Inifinite blocking call, waiting for transmission */
3577 restart:
3578 ret = lttng_poll_wait(&events, -1);
3579 if (ret < 0) {
3580 /*
3581 * Restart interrupted system call.
3582 */
3583 if (errno == EINTR) {
3584 goto restart;
3585 }
3586 goto error;
3587 }
3588
3589 nb_fd = ret;
3590
3591 for (i = 0; i < nb_fd; i++) {
3592 /* Fetch once the poll data */
3593 revents = LTTNG_POLL_GETEV(&events, i);
3594 pollfd = LTTNG_POLL_GETFD(&events, i);
3595
3596 /* Thread quit pipe has been closed. Killing thread. */
3597 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3598 if (ret) {
3599 err = 0;
3600 goto exit;
3601 }
3602
3603 /* Event on the registration socket */
3604 if (pollfd == sock) {
3605 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3606 ERR("Health socket poll error");
3607 goto error;
3608 }
3609 }
3610 }
3611
3612 new_sock = lttcomm_accept_unix_sock(sock);
3613 if (new_sock < 0) {
3614 goto error;
3615 }
3616
3617 /*
3618 * Set the CLOEXEC flag. Return code is useless because either way, the
3619 * show must go on.
3620 */
3621 (void) utils_set_fd_cloexec(new_sock);
3622
3623 DBG("Receiving data from client for health...");
3624 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
3625 if (ret <= 0) {
3626 DBG("Nothing recv() from client... continuing");
3627 ret = close(new_sock);
3628 if (ret) {
3629 PERROR("close");
3630 }
3631 new_sock = -1;
3632 continue;
3633 }
3634
3635 rcu_thread_online();
3636
3637 reply.ret_code = 0;
3638 for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
3639 /*
3640 * health_check_state returns 0 if health is
3641 * bad.
3642 */
3643 if (!health_check_state(health_sessiond, i)) {
3644 reply.ret_code |= 1ULL << i;
3645 }
3646 }
3647
3648 DBG2("Health check return value %" PRIx64, reply.ret_code);
3649
3650 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3651 if (ret < 0) {
3652 ERR("Failed to send health data back to client");
3653 }
3654
3655 /* End of transmission */
3656 ret = close(new_sock);
3657 if (ret) {
3658 PERROR("close");
3659 }
3660 new_sock = -1;
3661 }
3662
3663 exit:
3664 error:
3665 if (err) {
3666 ERR("Health error occurred in %s", __func__);
3667 }
3668 DBG("Health check thread dying");
3669 unlink(health_unix_sock_path);
3670 if (sock >= 0) {
3671 ret = close(sock);
3672 if (ret) {
3673 PERROR("close");
3674 }
3675 }
3676
3677 lttng_poll_clean(&events);
3678
3679 rcu_unregister_thread();
3680 return NULL;
3681 }
3682
3683 /*
3684 * This thread manage all clients request using the unix client socket for
3685 * communication.
3686 */
3687 static void *thread_manage_clients(void *data)
3688 {
3689 int sock = -1, ret, i, pollfd, err = -1;
3690 int sock_error;
3691 uint32_t revents, nb_fd;
3692 struct command_ctx *cmd_ctx = NULL;
3693 struct lttng_poll_event events;
3694
3695 DBG("[thread] Manage client started");
3696
3697 rcu_register_thread();
3698
3699 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
3700
3701 if (testpoint(thread_manage_clients)) {
3702 goto error_testpoint;
3703 }
3704
3705 health_code_update();
3706
3707 ret = lttcomm_listen_unix_sock(client_sock);
3708 if (ret < 0) {
3709 goto error_listen;
3710 }
3711
3712 /*
3713 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3714 * more will be added to this poll set.
3715 */
3716 ret = sessiond_set_thread_pollset(&events, 2);
3717 if (ret < 0) {
3718 goto error_create_poll;
3719 }
3720
3721 /* Add the application registration socket */
3722 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3723 if (ret < 0) {
3724 goto error;
3725 }
3726
3727 /*
3728 * Notify parent pid that we are ready to accept command for client side.
3729 * This ppid is the one from the external process that spawned us.
3730 */
3731 if (opt_sig_parent) {
3732 kill(ppid, SIGUSR1);
3733 }
3734
3735 /* Notify the parent of the fork() process that we are ready. */
3736 if (opt_daemon) {
3737 kill(child_ppid, SIGUSR1);
3738 }
3739
3740 if (testpoint(thread_manage_clients_before_loop)) {
3741 goto error;
3742 }
3743
3744 health_code_update();
3745
3746 while (1) {
3747 DBG("Accepting client command ...");
3748
3749 /* Inifinite blocking call, waiting for transmission */
3750 restart:
3751 health_poll_entry();
3752 ret = lttng_poll_wait(&events, -1);
3753 health_poll_exit();
3754 if (ret < 0) {
3755 /*
3756 * Restart interrupted system call.
3757 */
3758 if (errno == EINTR) {
3759 goto restart;
3760 }
3761 goto error;
3762 }
3763
3764 nb_fd = ret;
3765
3766 for (i = 0; i < nb_fd; i++) {
3767 /* Fetch once the poll data */
3768 revents = LTTNG_POLL_GETEV(&events, i);
3769 pollfd = LTTNG_POLL_GETFD(&events, i);
3770
3771 health_code_update();
3772
3773 /* Thread quit pipe has been closed. Killing thread. */
3774 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3775 if (ret) {
3776 err = 0;
3777 goto exit;
3778 }
3779
3780 /* Event on the registration socket */
3781 if (pollfd == client_sock) {
3782 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3783 ERR("Client socket poll error");
3784 goto error;
3785 }
3786 }
3787 }
3788
3789 DBG("Wait for client response");
3790
3791 health_code_update();
3792
3793 sock = lttcomm_accept_unix_sock(client_sock);
3794 if (sock < 0) {
3795 goto error;
3796 }
3797
3798 /*
3799 * Set the CLOEXEC flag. Return code is useless because either way, the
3800 * show must go on.
3801 */
3802 (void) utils_set_fd_cloexec(sock);
3803
3804 /* Set socket option for credentials retrieval */
3805 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3806 if (ret < 0) {
3807 goto error;
3808 }
3809
3810 /* Allocate context command to process the client request */
3811 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3812 if (cmd_ctx == NULL) {
3813 PERROR("zmalloc cmd_ctx");
3814 goto error;
3815 }
3816
3817 /* Allocate data buffer for reception */
3818 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3819 if (cmd_ctx->lsm == NULL) {
3820 PERROR("zmalloc cmd_ctx->lsm");
3821 goto error;
3822 }
3823
3824 cmd_ctx->llm = NULL;
3825 cmd_ctx->session = NULL;
3826
3827 health_code_update();
3828
3829 /*
3830 * Data is received from the lttng client. The struct
3831 * lttcomm_session_msg (lsm) contains the command and data request of
3832 * the client.
3833 */
3834 DBG("Receiving data from client ...");
3835 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3836 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3837 if (ret <= 0) {
3838 DBG("Nothing recv() from client... continuing");
3839 ret = close(sock);
3840 if (ret) {
3841 PERROR("close");
3842 }
3843 sock = -1;
3844 clean_command_ctx(&cmd_ctx);
3845 continue;
3846 }
3847
3848 health_code_update();
3849
3850 // TODO: Validate cmd_ctx including sanity check for
3851 // security purpose.
3852
3853 rcu_thread_online();
3854 /*
3855 * This function dispatch the work to the kernel or userspace tracer
3856 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3857 * informations for the client. The command context struct contains
3858 * everything this function may needs.
3859 */
3860 ret = process_client_msg(cmd_ctx, sock, &sock_error);
3861 rcu_thread_offline();
3862 if (ret < 0) {
3863 ret = close(sock);
3864 if (ret) {
3865 PERROR("close");
3866 }
3867 sock = -1;
3868 /*
3869 * TODO: Inform client somehow of the fatal error. At
3870 * this point, ret < 0 means that a zmalloc failed
3871 * (ENOMEM). Error detected but still accept
3872 * command, unless a socket error has been
3873 * detected.
3874 */
3875 clean_command_ctx(&cmd_ctx);
3876 continue;
3877 }
3878
3879 health_code_update();
3880
3881 DBG("Sending response (size: %d, retcode: %s)",
3882 cmd_ctx->lttng_msg_size,
3883 lttng_strerror(-cmd_ctx->llm->ret_code));
3884 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3885 if (ret < 0) {
3886 ERR("Failed to send data back to client");
3887 }
3888
3889 /* End of transmission */
3890 ret = close(sock);
3891 if (ret) {
3892 PERROR("close");
3893 }
3894 sock = -1;
3895
3896 clean_command_ctx(&cmd_ctx);
3897
3898 health_code_update();
3899 }
3900
3901 exit:
3902 error:
3903 if (sock >= 0) {
3904 ret = close(sock);
3905 if (ret) {
3906 PERROR("close");
3907 }
3908 }
3909
3910 lttng_poll_clean(&events);
3911 clean_command_ctx(&cmd_ctx);
3912
3913 error_listen:
3914 error_create_poll:
3915 error_testpoint:
3916 unlink(client_unix_sock_path);
3917 if (client_sock >= 0) {
3918 ret = close(client_sock);
3919 if (ret) {
3920 PERROR("close");
3921 }
3922 }
3923
3924 if (err) {
3925 health_error();
3926 ERR("Health error occurred in %s", __func__);
3927 }
3928
3929 health_unregister(health_sessiond);
3930
3931 DBG("Client thread dying");
3932
3933 rcu_unregister_thread();
3934 return NULL;
3935 }
3936
3937
3938 /*
3939 * usage function on stderr
3940 */
3941 static void usage(void)
3942 {
3943 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3944 fprintf(stderr, " -h, --help Display this usage.\n");
3945 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3946 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3947 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3948 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3949 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3950 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3951 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3952 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3953 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3954 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3955 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3956 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3957 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3958 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3959 fprintf(stderr, " -V, --version Show version number.\n");
3960 fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
3961 fprintf(stderr, " -q, --quiet No output at all.\n");
3962 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3963 fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3964 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3965 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3966 fprintf(stderr, " --jul-tcp-port JUL application registration TCP port\n");
3967 }
3968
3969 /*
3970 * daemon argument parsing
3971 */
3972 static int parse_args(int argc, char **argv)
3973 {
3974 int c;
3975
3976 static struct option long_options[] = {
3977 { "client-sock", 1, 0, 'c' },
3978 { "apps-sock", 1, 0, 'a' },
3979 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3980 { "kconsumerd-err-sock", 1, 0, 'E' },
3981 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3982 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3983 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3984 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3985 { "consumerd32-path", 1, 0, 'u' },
3986 { "consumerd32-libdir", 1, 0, 'U' },
3987 { "consumerd64-path", 1, 0, 't' },
3988 { "consumerd64-libdir", 1, 0, 'T' },
3989 { "daemonize", 0, 0, 'd' },
3990 { "sig-parent", 0, 0, 'S' },
3991 { "help", 0, 0, 'h' },
3992 { "group", 1, 0, 'g' },
3993 { "version", 0, 0, 'V' },
3994 { "quiet", 0, 0, 'q' },
3995 { "verbose", 0, 0, 'v' },
3996 { "verbose-consumer", 0, 0, 'Z' },
3997 { "no-kernel", 0, 0, 'N' },
3998 { "pidfile", 1, 0, 'p' },
3999 { "jul-tcp-port", 1, 0, 'J' },
4000 { NULL, 0, 0, 0 }
4001 };
4002
4003 while (1) {
4004 int option_index = 0;
4005 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:J:",
4006 long_options, &option_index);
4007 if (c == -1) {
4008 break;
4009 }
4010
4011 switch (c) {
4012 case 0:
4013 fprintf(stderr, "option %s", long_options[option_index].name);
4014 if (optarg) {
4015 fprintf(stderr, " with arg %s\n", optarg);
4016 }
4017 break;
4018 case 'c':
4019 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
4020 break;
4021 case 'a':
4022 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
4023 break;
4024 case 'd':
4025 opt_daemon = 1;
4026 break;
4027 case 'g':
4028 tracing_group_name = optarg;
4029 break;
4030 case 'h':
4031 usage();
4032 exit(EXIT_FAILURE);
4033 case 'V':
4034 fprintf(stdout, "%s\n", VERSION);
4035 exit(EXIT_SUCCESS);
4036 case 'S':
4037 opt_sig_parent = 1;
4038 break;
4039 case 'E':
4040 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
4041 break;
4042 case 'C':
4043 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
4044 break;
4045 case 'F':
4046 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
4047 break;
4048 case 'D':
4049 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
4050 break;
4051 case 'H':
4052 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
4053 break;
4054 case 'G':
4055 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
4056 break;
4057 case 'N':
4058 opt_no_kernel = 1;
4059 break;
4060 case 'q':
4061 lttng_opt_quiet = 1;
4062 break;
4063 case 'v':
4064 /* Verbose level can increase using multiple -v */
4065 lttng_opt_verbose += 1;
4066 break;
4067 case 'Z':
4068 opt_verbose_consumer += 1;
4069 break;
4070 case 'u':
4071 consumerd32_bin= optarg;
4072 break;
4073 case 'U':
4074 consumerd32_libdir = optarg;
4075 break;
4076 case 't':
4077 consumerd64_bin = optarg;
4078 break;
4079 case 'T':
4080 consumerd64_libdir = optarg;
4081 break;
4082 case 'p':
4083 opt_pidfile = optarg;
4084 break;
4085 case 'J': /* JUL TCP port. */
4086 {
4087 unsigned long v;
4088
4089 errno = 0;
4090 v = strtoul(optarg, NULL, 0);
4091 if (errno != 0 || !isdigit(optarg[0])) {
4092 ERR("Wrong value in --jul-tcp-port parameter: %s", optarg);
4093 return -1;
4094 }
4095 if (v == 0 || v >= 65535) {
4096 ERR("Port overflow in --jul-tcp-port parameter: %s", optarg);
4097 return -1;
4098 }
4099 jul_tcp_port = (uint32_t) v;
4100 DBG3("JUL TCP port set to non default: %u", jul_tcp_port);
4101 break;
4102 }
4103 default:
4104 /* Unknown option or other error.
4105 * Error is printed by getopt, just return */
4106 return -1;
4107 }
4108 }
4109
4110 return 0;
4111 }
4112
4113 /*
4114 * Creates the two needed socket by the daemon.
4115 * apps_sock - The communication socket for all UST apps.
4116 * client_sock - The communication of the cli tool (lttng).
4117 */
4118 static int init_daemon_socket(void)
4119 {
4120 int ret = 0;
4121 mode_t old_umask;
4122
4123 old_umask = umask(0);
4124
4125 /* Create client tool unix socket */
4126 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4127 if (client_sock < 0) {
4128 ERR("Create unix sock failed: %s", client_unix_sock_path);
4129 ret = -1;
4130 goto end;
4131 }
4132
4133 /* Set the cloexec flag */
4134 ret = utils_set_fd_cloexec(client_sock);
4135 if (ret < 0) {
4136 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4137 "Continuing but note that the consumer daemon will have a "
4138 "reference to this socket on exec()", client_sock);
4139 }
4140
4141 /* File permission MUST be 660 */
4142 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4143 if (ret < 0) {
4144 ERR("Set file permissions failed: %s", client_unix_sock_path);
4145 PERROR("chmod");
4146 goto end;
4147 }
4148
4149 /* Create the application unix socket */
4150 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4151 if (apps_sock < 0) {
4152 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4153 ret = -1;
4154 goto end;
4155 }
4156
4157 /* Set the cloexec flag */
4158 ret = utils_set_fd_cloexec(apps_sock);
4159 if (ret < 0) {
4160 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4161 "Continuing but note that the consumer daemon will have a "
4162 "reference to this socket on exec()", apps_sock);
4163 }
4164
4165 /* File permission MUST be 666 */
4166 ret = chmod(apps_unix_sock_path,
4167 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4168 if (ret < 0) {
4169 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4170 PERROR("chmod");
4171 goto end;
4172 }
4173
4174 DBG3("Session daemon client socket %d and application socket %d created",
4175 client_sock, apps_sock);
4176
4177 end:
4178 umask(old_umask);
4179 return ret;
4180 }
4181
4182 /*
4183 * Check if the global socket is available, and if a daemon is answering at the
4184 * other side. If yes, error is returned.
4185 */
4186 static int check_existing_daemon(void)
4187 {
4188 /* Is there anybody out there ? */
4189 if (lttng_session_daemon_alive()) {
4190 return -EEXIST;
4191 }
4192
4193 return 0;
4194 }
4195
4196 /*
4197 * Set the tracing group gid onto the client socket.
4198 *
4199 * Race window between mkdir and chown is OK because we are going from more
4200 * permissive (root.root) to less permissive (root.tracing).
4201 */
4202 static int set_permissions(char *rundir)
4203 {
4204 int ret;
4205 gid_t gid;
4206
4207 gid = utils_get_group_id(tracing_group_name);
4208
4209 /* Set lttng run dir */
4210 ret = chown(rundir, 0, gid);
4211 if (ret < 0) {
4212 ERR("Unable to set group on %s", rundir);
4213 PERROR("chown");
4214 }
4215
4216 /*
4217 * Ensure all applications and tracing group can search the run
4218 * dir. Allow everyone to read the directory, since it does not
4219 * buy us anything to hide its content.
4220 */
4221 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
4222 if (ret < 0) {
4223 ERR("Unable to set permissions on %s", rundir);
4224 PERROR("chmod");
4225 }
4226
4227 /* lttng client socket path */
4228 ret = chown(client_unix_sock_path, 0, gid);
4229 if (ret < 0) {
4230 ERR("Unable to set group on %s", client_unix_sock_path);
4231 PERROR("chown");
4232 }
4233
4234 /* kconsumer error socket path */
4235 ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
4236 if (ret < 0) {
4237 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4238 PERROR("chown");
4239 }
4240
4241 /* 64-bit ustconsumer error socket path */
4242 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
4243 if (ret < 0) {
4244 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4245 PERROR("chown");
4246 }
4247
4248 /* 32-bit ustconsumer compat32 error socket path */
4249 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
4250 if (ret < 0) {
4251 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4252 PERROR("chown");
4253 }
4254
4255 DBG("All permissions are set");
4256
4257 return ret;
4258 }
4259
4260 /*
4261 * Create the lttng run directory needed for all global sockets and pipe.
4262 */
4263 static int create_lttng_rundir(const char *rundir)
4264 {
4265 int ret;
4266
4267 DBG3("Creating LTTng run directory: %s", rundir);
4268
4269 ret = mkdir(rundir, S_IRWXU);
4270 if (ret < 0) {
4271 if (errno != EEXIST) {
4272 ERR("Unable to create %s", rundir);
4273 goto error;
4274 } else {
4275 ret = 0;
4276 }
4277 }
4278
4279 error:
4280 return ret;
4281 }
4282
4283 /*
4284 * Setup sockets and directory needed by the kconsumerd communication with the
4285 * session daemon.
4286 */
4287 static int set_consumer_sockets(struct consumer_data *consumer_data,
4288 const char *rundir)
4289 {
4290 int ret;
4291 char path[PATH_MAX];
4292
4293 switch (consumer_data->type) {
4294 case LTTNG_CONSUMER_KERNEL:
4295 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4296 break;
4297 case LTTNG_CONSUMER64_UST:
4298 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4299 break;
4300 case LTTNG_CONSUMER32_UST:
4301 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4302 break;
4303 default:
4304 ERR("Consumer type unknown");
4305 ret = -EINVAL;
4306 goto error;
4307 }
4308
4309 DBG2("Creating consumer directory: %s", path);
4310
4311 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
4312 if (ret < 0) {
4313 if (errno != EEXIST) {
4314 PERROR("mkdir");
4315 ERR("Failed to create %s", path);
4316 goto error;
4317 }
4318 ret = -1;
4319 }
4320 if (is_root) {
4321 ret = chown(path, 0, utils_get_group_id(tracing_group_name));
4322 if (ret < 0) {
4323 ERR("Unable to set group on %s", path);
4324 PERROR("chown");
4325 goto error;
4326 }
4327 }
4328
4329 /* Create the kconsumerd error unix socket */
4330 consumer_data->err_sock =
4331 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4332 if (consumer_data->err_sock < 0) {
4333 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4334 ret = -1;
4335 goto error;
4336 }
4337
4338 /*
4339 * Set the CLOEXEC flag. Return code is useless because either way, the
4340 * show must go on.
4341 */
4342 ret = utils_set_fd_cloexec(consumer_data->err_sock);
4343 if (ret < 0) {
4344 PERROR("utils_set_fd_cloexec");
4345 /* continue anyway */
4346 }
4347
4348 /* File permission MUST be 660 */
4349 ret = chmod(consumer_data->err_unix_sock_path,
4350 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4351 if (ret < 0) {
4352 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4353 PERROR("chmod");
4354 goto error;
4355 }
4356
4357 error:
4358 return ret;
4359 }
4360
4361 /*
4362 * Signal handler for the daemon
4363 *
4364 * Simply stop all worker threads, leaving main() return gracefully after
4365 * joining all threads and calling cleanup().
4366 */
4367 static void sighandler(int sig)
4368 {
4369 switch (sig) {
4370 case SIGPIPE:
4371 DBG("SIGPIPE caught");
4372 return;
4373 case SIGINT:
4374 DBG("SIGINT caught");
4375 stop_threads();
4376 break;
4377 case SIGTERM:
4378 DBG("SIGTERM caught");
4379 stop_threads();
4380 break;
4381 case SIGUSR1:
4382 CMM_STORE_SHARED(recv_child_signal, 1);
4383 break;
4384 default:
4385 break;
4386 }
4387 }
4388
4389 /*
4390 * Setup signal handler for :
4391 * SIGINT, SIGTERM, SIGPIPE
4392 */
4393 static int set_signal_handler(void)
4394 {
4395 int ret = 0;
4396 struct sigaction sa;
4397 sigset_t sigset;
4398
4399 if ((ret = sigemptyset(&sigset)) < 0) {
4400 PERROR("sigemptyset");
4401 return ret;
4402 }
4403
4404 sa.sa_handler = sighandler;
4405 sa.sa_mask = sigset;
4406 sa.sa_flags = 0;
4407 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4408 PERROR("sigaction");
4409 return ret;
4410 }
4411
4412 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4413 PERROR("sigaction");
4414 return ret;
4415 }
4416
4417 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4418 PERROR("sigaction");
4419 return ret;
4420 }
4421
4422 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
4423 PERROR("sigaction");
4424 return ret;
4425 }
4426
4427 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
4428
4429 return ret;
4430 }
4431
4432 /*
4433 * Set open files limit to unlimited. This daemon can open a large number of
4434 * file descriptors in order to consumer multiple kernel traces.
4435 */
4436 static void set_ulimit(void)
4437 {
4438 int ret;
4439 struct rlimit lim;
4440
4441 /* The kernel does not allowed an infinite limit for open files */
4442 lim.rlim_cur = 65535;
4443 lim.rlim_max = 65535;
4444
4445 ret = setrlimit(RLIMIT_NOFILE, &lim);
4446 if (ret < 0) {
4447 PERROR("failed to set open files limit");
4448 }
4449 }
4450
4451 /*
4452 * Write pidfile using the rundir and opt_pidfile.
4453 */
4454 static void write_pidfile(void)
4455 {
4456 int ret;
4457 char pidfile_path[PATH_MAX];
4458
4459 assert(rundir);
4460
4461 if (opt_pidfile) {
4462 strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
4463 } else {
4464 /* Build pidfile path from rundir and opt_pidfile. */
4465 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
4466 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
4467 if (ret < 0) {
4468 PERROR("snprintf pidfile path");
4469 goto error;
4470 }
4471 }
4472
4473 /*
4474 * Create pid file in rundir. Return value is of no importance. The
4475 * execution will continue even though we are not able to write the file.
4476 */
4477 (void) utils_create_pid_file(getpid(), pidfile_path);
4478
4479 error:
4480 return;
4481 }
4482
4483 /*
4484 * Write JUL TCP port using the rundir.
4485 */
4486 static void write_julport(void)
4487 {
4488 int ret;
4489 char path[PATH_MAX];
4490
4491 assert(rundir);
4492
4493 ret = snprintf(path, sizeof(path), "%s/"
4494 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE, rundir);
4495 if (ret < 0) {
4496 PERROR("snprintf julport path");
4497 goto error;
4498 }
4499
4500 /*
4501 * Create TCP JUL port file in rundir. Return value is of no importance.
4502 * The execution will continue even though we are not able to write the
4503 * file.
4504 */
4505 (void) utils_create_pid_file(jul_tcp_port, path);
4506
4507 error:
4508 return;
4509 }
4510
4511 /*
4512 * Daemonize this process by forking and making the parent wait for the child
4513 * to signal it indicating readiness. Once received, the parent successfully
4514 * quits.
4515 *
4516 * The child process undergoes the same action that daemon(3) does meaning
4517 * setsid, chdir, and dup /dev/null into 0, 1 and 2.
4518 *
4519 * Return 0 on success else -1 on error.
4520 */
4521 static int daemonize(void)
4522 {
4523 int ret;
4524 pid_t pid;
4525
4526 /* Get parent pid of this process. */
4527 child_ppid = getppid();
4528
4529 pid = fork();
4530 if (pid < 0) {
4531 PERROR("fork");
4532 goto error;
4533 } else if (pid == 0) {
4534 int fd;
4535 pid_t sid;
4536
4537 /* Child */
4538
4539 /*
4540 * Get the newly created parent pid so we can signal that process when
4541 * we are ready to operate.
4542 */
4543 child_ppid = getppid();
4544
4545 sid = setsid();
4546 if (sid < 0) {
4547 PERROR("setsid");
4548 goto error;
4549 }
4550
4551 /* Try to change directory to /. If we can't well at least notify. */
4552 ret = chdir("/");
4553 if (ret < 0) {
4554 PERROR("chdir");
4555 }
4556
4557 fd = open(_PATH_DEVNULL, O_RDWR, 0);
4558 if (fd < 0) {
4559 PERROR("open %s", _PATH_DEVNULL);
4560 /* Let 0, 1 and 2 open since we can't bind them to /dev/null. */
4561 } else {
4562 (void) dup2(fd, STDIN_FILENO);
4563 (void) dup2(fd, STDOUT_FILENO);
4564 (void) dup2(fd, STDERR_FILENO);
4565 if (fd > 2) {
4566 ret = close(fd);
4567 if (ret < 0) {
4568 PERROR("close");
4569 }
4570 }
4571 }
4572 goto end;
4573 } else {
4574 /* Parent */
4575
4576 /*
4577 * Waiting for child to notify this parent that it can exit. Note that
4578 * sleep() is interrupted before the 1 second delay as soon as the
4579 * signal is received, so it will not cause visible delay for the
4580 * user.
4581 */
4582 while (!CMM_LOAD_SHARED(recv_child_signal)) {
4583 int status;
4584 pid_t ret;
4585
4586 /*
4587 * Check if child exists without blocking. If so, we have to stop
4588 * this parent process and return an error.
4589 */
4590 ret = waitpid(pid, &status, WNOHANG);
4591 if (ret < 0 || (ret != 0 && WIFEXITED(status))) {
4592 /* The child exited somehow or was not valid. */
4593 goto error;
4594 }
4595 sleep(1);
4596 }
4597
4598 /*
4599 * From this point on, the parent can exit and the child is now an
4600 * operationnal session daemon ready to serve clients and applications.
4601 */
4602 exit(EXIT_SUCCESS);
4603 }
4604
4605 end:
4606 return 0;
4607
4608 error:
4609 return -1;
4610 }
4611
4612 /*
4613 * main
4614 */
4615 int main(int argc, char **argv)
4616 {
4617 int ret = 0;
4618 void *status;
4619 const char *home_path, *env_app_timeout;
4620
4621 init_kernel_workarounds();
4622
4623 rcu_register_thread();
4624
4625 if ((ret = set_signal_handler()) < 0) {
4626 goto error;
4627 }
4628
4629 setup_consumerd_path();
4630
4631 page_size = sysconf(_SC_PAGESIZE);
4632 if (page_size < 0) {
4633 PERROR("sysconf _SC_PAGESIZE");
4634 page_size = LONG_MAX;
4635 WARN("Fallback page size to %ld", page_size);
4636 }
4637
4638 /* Parse arguments */
4639 progname = argv[0];
4640 if ((ret = parse_args(argc, argv)) < 0) {
4641 goto error;
4642 }
4643
4644 /* Daemonize */
4645 if (opt_daemon) {
4646 int i;
4647
4648 ret = daemonize();
4649 if (ret < 0) {
4650 goto error;
4651 }
4652
4653 /*
4654 * We are in the child. Make sure all other file descriptors are
4655 * closed, in case we are called with more opened file descriptors than
4656 * the standard ones.
4657 */
4658 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4659 (void) close(i);
4660 }
4661 }
4662
4663 /* Create thread quit pipe */
4664 if ((ret = init_thread_quit_pipe()) < 0) {
4665 goto error;
4666 }
4667
4668 /* Check if daemon is UID = 0 */
4669 is_root = !getuid();
4670
4671 if (is_root) {
4672 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4673
4674 /* Create global run dir with root access */
4675 ret = create_lttng_rundir(rundir);
4676 if (ret < 0) {
4677 goto error;
4678 }
4679
4680 if (strlen(apps_unix_sock_path) == 0) {
4681 snprintf(apps_unix_sock_path, PATH_MAX,
4682 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4683 }
4684
4685 if (strlen(client_unix_sock_path) == 0) {
4686 snprintf(client_unix_sock_path, PATH_MAX,
4687 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4688 }
4689
4690 /* Set global SHM for ust */
4691 if (strlen(wait_shm_path) == 0) {
4692 snprintf(wait_shm_path, PATH_MAX,
4693 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4694 }
4695
4696 if (strlen(health_unix_sock_path) == 0) {
4697 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4698 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
4699 }
4700
4701 /* Setup kernel consumerd path */
4702 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4703 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4704 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4705 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4706
4707 DBG2("Kernel consumer err path: %s",
4708 kconsumer_data.err_unix_sock_path);
4709 DBG2("Kernel consumer cmd path: %s",
4710 kconsumer_data.cmd_unix_sock_path);
4711 } else {
4712 home_path = utils_get_home_dir();
4713 if (home_path == NULL) {
4714 /* TODO: Add --socket PATH option */
4715 ERR("Can't get HOME directory for sockets creation.");
4716 ret = -EPERM;
4717 goto error;
4718 }
4719
4720 /*
4721 * Create rundir from home path. This will create something like
4722 * $HOME/.lttng
4723 */
4724 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4725 if (ret < 0) {
4726 ret = -ENOMEM;
4727 goto error;
4728 }
4729
4730 ret = create_lttng_rundir(rundir);
4731 if (ret < 0) {
4732 goto error;
4733 }
4734
4735 if (strlen(apps_unix_sock_path) == 0) {
4736 snprintf(apps_unix_sock_path, PATH_MAX,
4737 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4738 }
4739
4740 /* Set the cli tool unix socket path */
4741 if (strlen(client_unix_sock_path) == 0) {
4742 snprintf(client_unix_sock_path, PATH_MAX,
4743 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4744 }
4745
4746 /* Set global SHM for ust */
4747 if (strlen(wait_shm_path) == 0) {
4748 snprintf(wait_shm_path, PATH_MAX,
4749 DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
4750 }
4751
4752 /* Set health check Unix path */
4753 if (strlen(health_unix_sock_path) == 0) {
4754 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4755 DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path);
4756 }
4757 }
4758
4759 /* Set consumer initial state */
4760 kernel_consumerd_state = CONSUMER_STOPPED;
4761 ust_consumerd_state = CONSUMER_STOPPED;
4762
4763 DBG("Client socket path %s", client_unix_sock_path);
4764 DBG("Application socket path %s", apps_unix_sock_path);
4765 DBG("Application wait path %s", wait_shm_path);
4766 DBG("LTTng run directory path: %s", rundir);
4767
4768 /* 32 bits consumerd path setup */
4769 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4770 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4771 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4772 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4773
4774 DBG2("UST consumer 32 bits err path: %s",
4775 ustconsumer32_data.err_unix_sock_path);
4776 DBG2("UST consumer 32 bits cmd path: %s",
4777 ustconsumer32_data.cmd_unix_sock_path);
4778
4779 /* 64 bits consumerd path setup */
4780 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4781 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4782 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4783 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4784
4785 DBG2("UST consumer 64 bits err path: %s",
4786 ustconsumer64_data.err_unix_sock_path);
4787 DBG2("UST consumer 64 bits cmd path: %s",
4788 ustconsumer64_data.cmd_unix_sock_path);
4789
4790 /*
4791 * See if daemon already exist.
4792 */
4793 if ((ret = check_existing_daemon()) < 0) {
4794 ERR("Already running daemon.\n");
4795 /*
4796 * We do not goto exit because we must not cleanup()
4797 * because a daemon is already running.
4798 */
4799 goto error;
4800 }
4801
4802 /*
4803 * Init UST app hash table. Alloc hash table before this point since
4804 * cleanup() can get called after that point.
4805 */
4806 ust_app_ht_alloc();
4807
4808 /* Initialize JUL domain subsystem. */
4809 if ((ret = jul_init()) < 0) {
4810 /* ENOMEM at this point. */
4811 goto error;
4812 }
4813
4814 /* After this point, we can safely call cleanup() with "goto exit" */
4815
4816 /*
4817 * These actions must be executed as root. We do that *after* setting up
4818 * the sockets path because we MUST make the check for another daemon using
4819 * those paths *before* trying to set the kernel consumer sockets and init
4820 * kernel tracer.
4821 */
4822 if (is_root) {
4823 ret = set_consumer_sockets(&kconsumer_data, rundir);
4824 if (ret < 0) {
4825 goto exit;
4826 }
4827
4828 /* Setup kernel tracer */
4829 if (!opt_no_kernel) {
4830 init_kernel_tracer();
4831 }
4832
4833 /* Set ulimit for open files */
4834 set_ulimit();
4835 }
4836 /* init lttng_fd tracking must be done after set_ulimit. */
4837 lttng_fd_init();
4838
4839 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4840 if (ret < 0) {
4841 goto exit;
4842 }
4843
4844 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4845 if (ret < 0) {
4846 goto exit;
4847 }
4848
4849 /* Setup the needed unix socket */
4850 if ((ret = init_daemon_socket()) < 0) {
4851 goto exit;
4852 }
4853
4854 /* Set credentials to socket */
4855 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4856 goto exit;
4857 }
4858
4859 /* Get parent pid if -S, --sig-parent is specified. */
4860 if (opt_sig_parent) {
4861 ppid = getppid();
4862 }
4863
4864 /* Setup the kernel pipe for waking up the kernel thread */
4865 if (is_root && !opt_no_kernel) {
4866 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
4867 goto exit;
4868 }
4869 }
4870
4871 /* Setup the thread ht_cleanup communication pipe. */
4872 if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) {
4873 goto exit;
4874 }
4875
4876 /* Setup the thread apps communication pipe. */
4877 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
4878 goto exit;
4879 }
4880
4881 /* Setup the thread apps notify communication pipe. */
4882 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) {
4883 goto exit;
4884 }
4885
4886 /* Initialize global buffer per UID and PID registry. */
4887 buffer_reg_init_uid_registry();
4888 buffer_reg_init_pid_registry();
4889
4890 /* Init UST command queue. */
4891 cds_wfq_init(&ust_cmd_queue.queue);
4892
4893 /*
4894 * Get session list pointer. This pointer MUST NOT be free(). This list is
4895 * statically declared in session.c
4896 */
4897 session_list_ptr = session_get_list();
4898
4899 /* Set up max poll set size */
4900 lttng_poll_set_max_size();
4901
4902 cmd_init();
4903
4904 /* Check for the application socket timeout env variable. */
4905 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
4906 if (env_app_timeout) {
4907 app_socket_timeout = atoi(env_app_timeout);
4908 } else {
4909 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
4910 }
4911
4912 write_pidfile();
4913 write_julport();
4914
4915 /* Initialize communication library */
4916 lttcomm_init();
4917 /* This is to get the TCP timeout value. */
4918 lttcomm_inet_init();
4919
4920 /*
4921 * Initialize the health check subsystem. This call should set the
4922 * appropriate time values.
4923 */
4924 health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
4925 if (!health_sessiond) {
4926 PERROR("health_app_create error");
4927 goto exit_health_sessiond_cleanup;
4928 }
4929
4930 /* Create thread to clean up RCU hash tables */
4931 ret = pthread_create(&ht_cleanup_thread, NULL,
4932 thread_ht_cleanup, (void *) NULL);
4933 if (ret != 0) {
4934 PERROR("pthread_create ht_cleanup");
4935 goto exit_ht_cleanup;
4936 }
4937
4938 /* Create health-check thread */
4939 ret = pthread_create(&health_thread, NULL,
4940 thread_manage_health, (void *) NULL);
4941 if (ret != 0) {
4942 PERROR("pthread_create health");
4943 goto exit_health;
4944 }
4945
4946 /* Create thread to manage the client socket */
4947 ret = pthread_create(&client_thread, NULL,
4948 thread_manage_clients, (void *) NULL);
4949 if (ret != 0) {
4950 PERROR("pthread_create clients");
4951 goto exit_client;
4952 }
4953
4954 /* Create thread to dispatch registration */
4955 ret = pthread_create(&dispatch_thread, NULL,
4956 thread_dispatch_ust_registration, (void *) NULL);
4957 if (ret != 0) {
4958 PERROR("pthread_create dispatch");
4959 goto exit_dispatch;
4960 }
4961
4962 /* Create thread to manage application registration. */
4963 ret = pthread_create(&reg_apps_thread, NULL,
4964 thread_registration_apps, (void *) NULL);
4965 if (ret != 0) {
4966 PERROR("pthread_create registration");
4967 goto exit_reg_apps;
4968 }
4969
4970 /* Create thread to manage application socket */
4971 ret = pthread_create(&apps_thread, NULL,
4972 thread_manage_apps, (void *) NULL);
4973 if (ret != 0) {
4974 PERROR("pthread_create apps");
4975 goto exit_apps;
4976 }
4977
4978 /* Create thread to manage application notify socket */
4979 ret = pthread_create(&apps_notify_thread, NULL,
4980 ust_thread_manage_notify, (void *) NULL);
4981 if (ret != 0) {
4982 PERROR("pthread_create apps");
4983 goto exit_apps_notify;
4984 }
4985
4986 /* Create JUL registration thread. */
4987 ret = pthread_create(&jul_reg_thread, NULL,
4988 jul_thread_manage_registration, (void *) NULL);
4989 if (ret != 0) {
4990 PERROR("pthread_create apps");
4991 goto exit_jul_reg;
4992 }
4993
4994 /* Don't start this thread if kernel tracing is not requested nor root */
4995 if (is_root && !opt_no_kernel) {
4996 /* Create kernel thread to manage kernel event */
4997 ret = pthread_create(&kernel_thread, NULL,
4998 thread_manage_kernel, (void *) NULL);
4999 if (ret != 0) {
5000 PERROR("pthread_create kernel");
5001 goto exit_kernel;
5002 }
5003
5004 ret = pthread_join(kernel_thread, &status);
5005 if (ret != 0) {
5006 PERROR("pthread_join");
5007 goto error; /* join error, exit without cleanup */
5008 }
5009 }
5010
5011 exit_kernel:
5012 ret = pthread_join(jul_reg_thread, &status);
5013 if (ret != 0) {
5014 PERROR("pthread_join JUL");
5015 goto error; /* join error, exit without cleanup */
5016 }
5017
5018 exit_jul_reg:
5019 ret = pthread_join(apps_notify_thread, &status);
5020 if (ret != 0) {
5021 PERROR("pthread_join apps notify");
5022 goto error; /* join error, exit without cleanup */
5023 }
5024
5025 exit_apps_notify:
5026 ret = pthread_join(apps_thread, &status);
5027 if (ret != 0) {
5028 PERROR("pthread_join apps");
5029 goto error; /* join error, exit without cleanup */
5030 }
5031
5032
5033 exit_apps:
5034 ret = pthread_join(reg_apps_thread, &status);
5035 if (ret != 0) {
5036 PERROR("pthread_join");
5037 goto error; /* join error, exit without cleanup */
5038 }
5039
5040 exit_reg_apps:
5041 ret = pthread_join(dispatch_thread, &status);
5042 if (ret != 0) {
5043 PERROR("pthread_join");
5044 goto error; /* join error, exit without cleanup */
5045 }
5046
5047 exit_dispatch:
5048 ret = pthread_join(client_thread, &status);
5049 if (ret != 0) {
5050 PERROR("pthread_join");
5051 goto error; /* join error, exit without cleanup */
5052 }
5053
5054 ret = join_consumer_thread(&kconsumer_data);
5055 if (ret != 0) {
5056 PERROR("join_consumer");
5057 goto error; /* join error, exit without cleanup */
5058 }
5059
5060 ret = join_consumer_thread(&ustconsumer32_data);
5061 if (ret != 0) {
5062 PERROR("join_consumer ust32");
5063 goto error; /* join error, exit without cleanup */
5064 }
5065
5066 ret = join_consumer_thread(&ustconsumer64_data);
5067 if (ret != 0) {
5068 PERROR("join_consumer ust64");
5069 goto error; /* join error, exit without cleanup */
5070 }
5071
5072 exit_client:
5073 ret = pthread_join(health_thread, &status);
5074 if (ret != 0) {
5075 PERROR("pthread_join health thread");
5076 goto error; /* join error, exit without cleanup */
5077 }
5078
5079 exit_health:
5080 ret = pthread_join(ht_cleanup_thread, &status);
5081 if (ret != 0) {
5082 PERROR("pthread_join ht cleanup thread");
5083 goto error; /* join error, exit without cleanup */
5084 }
5085 exit_ht_cleanup:
5086 health_app_destroy(health_sessiond);
5087 exit_health_sessiond_cleanup:
5088 exit:
5089 /*
5090 * cleanup() is called when no other thread is running.
5091 */
5092 rcu_thread_online();
5093 cleanup();
5094 rcu_thread_offline();
5095 rcu_unregister_thread();
5096 if (!ret) {
5097 exit(EXIT_SUCCESS);
5098 }
5099 error:
5100 exit(EXIT_FAILURE);
5101 }
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