Cleanup: ust_session_id unused by buffer_reg_uid_consumer_channel_key
[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 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #define _LGPL_SOURCE
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <paths.h>
25 #include <pthread.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <inttypes.h>
31 #include <sys/mman.h>
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
35 #include <sys/stat.h>
36 #include <sys/types.h>
37 #include <sys/wait.h>
38 #include <urcu/uatomic.h>
39 #include <unistd.h>
40 #include <ctype.h>
41
42 #include <common/common.h>
43 #include <common/compat/socket.h>
44 #include <common/compat/getenv.h>
45 #include <common/defaults.h>
46 #include <common/kernel-consumer/kernel-consumer.h>
47 #include <common/futex.h>
48 #include <common/relayd/relayd.h>
49 #include <common/utils.h>
50 #include <common/daemonize.h>
51 #include <common/config/session-config.h>
52
53 #include "lttng-sessiond.h"
54 #include "buffer-registry.h"
55 #include "channel.h"
56 #include "cmd.h"
57 #include "consumer.h"
58 #include "context.h"
59 #include "event.h"
60 #include "kernel.h"
61 #include "kernel-consumer.h"
62 #include "modprobe.h"
63 #include "shm.h"
64 #include "ust-ctl.h"
65 #include "ust-consumer.h"
66 #include "utils.h"
67 #include "fd-limit.h"
68 #include "health-sessiond.h"
69 #include "testpoint.h"
70 #include "ust-thread.h"
71 #include "agent-thread.h"
72 #include "save.h"
73 #include "load-session-thread.h"
74 #include "notification-thread.h"
75 #include "notification-thread-commands.h"
76 #include "rotation-thread.h"
77 #include "lttng-syscall.h"
78 #include "agent.h"
79 #include "ht-cleanup.h"
80 #include "sessiond-config.h"
81 #include "sessiond-timer.h"
82
83 static const char *help_msg =
84 #ifdef LTTNG_EMBED_HELP
85 #include <lttng-sessiond.8.h>
86 #else
87 NULL
88 #endif
89 ;
90
91 const char *progname;
92 static pid_t ppid; /* Parent PID for --sig-parent option */
93 static pid_t child_ppid; /* Internal parent PID use with daemonize. */
94 static int lockfile_fd = -1;
95
96 /* Set to 1 when a SIGUSR1 signal is received. */
97 static int recv_child_signal;
98
99 static struct lttng_kernel_tracer_version kernel_tracer_version;
100 static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version;
101
102 /*
103 * Consumer daemon specific control data. Every value not initialized here is
104 * set to 0 by the static definition.
105 */
106 static struct consumer_data kconsumer_data = {
107 .type = LTTNG_CONSUMER_KERNEL,
108 .err_sock = -1,
109 .cmd_sock = -1,
110 .channel_monitor_pipe = -1,
111 .channel_rotate_pipe = -1,
112 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
113 .lock = PTHREAD_MUTEX_INITIALIZER,
114 .cond = PTHREAD_COND_INITIALIZER,
115 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
116 };
117 static struct consumer_data ustconsumer64_data = {
118 .type = LTTNG_CONSUMER64_UST,
119 .err_sock = -1,
120 .cmd_sock = -1,
121 .channel_monitor_pipe = -1,
122 .channel_rotate_pipe = -1,
123 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
124 .lock = PTHREAD_MUTEX_INITIALIZER,
125 .cond = PTHREAD_COND_INITIALIZER,
126 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
127 };
128 static struct consumer_data ustconsumer32_data = {
129 .type = LTTNG_CONSUMER32_UST,
130 .err_sock = -1,
131 .cmd_sock = -1,
132 .channel_monitor_pipe = -1,
133 .channel_rotate_pipe = -1,
134 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
135 .lock = PTHREAD_MUTEX_INITIALIZER,
136 .cond = PTHREAD_COND_INITIALIZER,
137 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
138 };
139
140 /* Command line options */
141 static const struct option long_options[] = {
142 { "client-sock", required_argument, 0, 'c' },
143 { "apps-sock", required_argument, 0, 'a' },
144 { "kconsumerd-cmd-sock", required_argument, 0, '\0' },
145 { "kconsumerd-err-sock", required_argument, 0, '\0' },
146 { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' },
147 { "ustconsumerd32-err-sock", required_argument, 0, '\0' },
148 { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' },
149 { "ustconsumerd64-err-sock", required_argument, 0, '\0' },
150 { "consumerd32-path", required_argument, 0, '\0' },
151 { "consumerd32-libdir", required_argument, 0, '\0' },
152 { "consumerd64-path", required_argument, 0, '\0' },
153 { "consumerd64-libdir", required_argument, 0, '\0' },
154 { "daemonize", no_argument, 0, 'd' },
155 { "background", no_argument, 0, 'b' },
156 { "sig-parent", no_argument, 0, 'S' },
157 { "help", no_argument, 0, 'h' },
158 { "group", required_argument, 0, 'g' },
159 { "version", no_argument, 0, 'V' },
160 { "quiet", no_argument, 0, 'q' },
161 { "verbose", no_argument, 0, 'v' },
162 { "verbose-consumer", no_argument, 0, '\0' },
163 { "no-kernel", no_argument, 0, '\0' },
164 { "pidfile", required_argument, 0, 'p' },
165 { "agent-tcp-port", required_argument, 0, '\0' },
166 { "config", required_argument, 0, 'f' },
167 { "load", required_argument, 0, 'l' },
168 { "kmod-probes", required_argument, 0, '\0' },
169 { "extra-kmod-probes", required_argument, 0, '\0' },
170 { NULL, 0, 0, 0 }
171 };
172
173 struct sessiond_config config;
174
175 /* Command line options to ignore from configuration file */
176 static const char *config_ignore_options[] = { "help", "version", "config" };
177
178 /* Shared between threads */
179 static int dispatch_thread_exit;
180
181 /* Sockets and FDs */
182 static int client_sock = -1;
183 static int apps_sock = -1;
184 int kernel_tracer_fd = -1;
185 static int kernel_poll_pipe[2] = { -1, -1 };
186
187 /*
188 * Quit pipe for all threads. This permits a single cancellation point
189 * for all threads when receiving an event on the pipe.
190 */
191 static int thread_quit_pipe[2] = { -1, -1 };
192
193 /*
194 * This pipe is used to inform the thread managing application communication
195 * that a command is queued and ready to be processed.
196 */
197 static int apps_cmd_pipe[2] = { -1, -1 };
198
199 int apps_cmd_notify_pipe[2] = { -1, -1 };
200
201 /* Pthread, Mutexes and Semaphores */
202 static pthread_t apps_thread;
203 static pthread_t apps_notify_thread;
204 static pthread_t reg_apps_thread;
205 static pthread_t client_thread;
206 static pthread_t kernel_thread;
207 static pthread_t dispatch_thread;
208 static pthread_t health_thread;
209 static pthread_t ht_cleanup_thread;
210 static pthread_t agent_reg_thread;
211 static pthread_t load_session_thread;
212 static pthread_t notification_thread;
213 static pthread_t rotation_thread;
214 static pthread_t timer_thread;
215
216 /*
217 * UST registration command queue. This queue is tied with a futex and uses a N
218 * wakers / 1 waiter implemented and detailed in futex.c/.h
219 *
220 * The thread_registration_apps and thread_dispatch_ust_registration uses this
221 * queue along with the wait/wake scheme. The thread_manage_apps receives down
222 * the line new application socket and monitors it for any I/O error or clean
223 * close that triggers an unregistration of the application.
224 */
225 static struct ust_cmd_queue ust_cmd_queue;
226
227 /*
228 * Pointer initialized before thread creation.
229 *
230 * This points to the tracing session list containing the session count and a
231 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
232 * MUST NOT be taken if you call a public function in session.c.
233 *
234 * The lock is nested inside the structure: session_list_ptr->lock. Please use
235 * session_lock_list and session_unlock_list for lock acquisition.
236 */
237 static struct ltt_session_list *session_list_ptr;
238
239 int ust_consumerd64_fd = -1;
240 int ust_consumerd32_fd = -1;
241
242 static const char *module_proc_lttng = "/proc/lttng";
243
244 /*
245 * Consumer daemon state which is changed when spawning it, killing it or in
246 * case of a fatal error.
247 */
248 enum consumerd_state {
249 CONSUMER_STARTED = 1,
250 CONSUMER_STOPPED = 2,
251 CONSUMER_ERROR = 3,
252 };
253
254 /*
255 * This consumer daemon state is used to validate if a client command will be
256 * able to reach the consumer. If not, the client is informed. For instance,
257 * doing a "lttng start" when the consumer state is set to ERROR will return an
258 * error to the client.
259 *
260 * The following example shows a possible race condition of this scheme:
261 *
262 * consumer thread error happens
263 * client cmd arrives
264 * client cmd checks state -> still OK
265 * consumer thread exit, sets error
266 * client cmd try to talk to consumer
267 * ...
268 *
269 * However, since the consumer is a different daemon, we have no way of making
270 * sure the command will reach it safely even with this state flag. This is why
271 * we consider that up to the state validation during command processing, the
272 * command is safe. After that, we can not guarantee the correctness of the
273 * client request vis-a-vis the consumer.
274 */
275 static enum consumerd_state ust_consumerd_state;
276 static enum consumerd_state kernel_consumerd_state;
277
278 /* Set in main() with the current page size. */
279 long page_size;
280
281 /* Application health monitoring */
282 struct health_app *health_sessiond;
283
284 /* Am I root or not. */
285 int is_root; /* Set to 1 if the daemon is running as root */
286
287 const char * const config_section_name = "sessiond";
288
289 /* Load session thread information to operate. */
290 struct load_session_thread_data *load_info;
291
292 /* Notification thread handle. */
293 struct notification_thread_handle *notification_thread_handle;
294
295 /* Rotation thread handle. */
296 struct rotation_thread_handle *rotation_thread_handle;
297
298 /* Global hash tables */
299 struct lttng_ht *agent_apps_ht_by_sock = NULL;
300
301 /*
302 * The initialization of the session daemon is done in multiple phases.
303 *
304 * While all threads are launched near-simultaneously, only some of them
305 * are needed to ensure the session daemon can start to respond to client
306 * requests.
307 *
308 * There are two important guarantees that we wish to offer with respect
309 * to the initialisation of the session daemon:
310 * - When the daemonize/background launcher process exits, the sessiond
311 * is fully able to respond to client requests,
312 * - Auto-loaded sessions are visible to clients.
313 *
314 * In order to achieve this, a number of support threads have to be launched
315 * to allow the "client" thread to function properly. Moreover, since the
316 * "load session" thread needs the client thread, we must provide a way
317 * for the "load session" thread to know that the "client" thread is up
318 * and running.
319 *
320 * Hence, the support threads decrement the lttng_sessiond_ready counter
321 * while the "client" threads waits for it to reach 0. Once the "client" thread
322 * unblocks, it posts the message_thread_ready semaphore which allows the
323 * "load session" thread to progress.
324 *
325 * This implies that the "load session" thread is the last to be initialized
326 * and will explicitly call sessiond_signal_parents(), which signals the parents
327 * that the session daemon is fully initialized.
328 *
329 * The four (4) support threads are:
330 * - agent_thread
331 * - notification_thread
332 * - rotation_thread
333 * - health_thread
334 */
335 #define NR_LTTNG_SESSIOND_SUPPORT_THREADS 4
336 int lttng_sessiond_ready = NR_LTTNG_SESSIOND_SUPPORT_THREADS;
337
338 int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
339 {
340 return (fd == thread_quit_pipe[0] && (events & LPOLLIN)) ? 1 : 0;
341 }
342
343 /* Notify parents that we are ready for cmd and health check */
344 LTTNG_HIDDEN
345 void sessiond_signal_parents(void)
346 {
347 /*
348 * Notify parent pid that we are ready to accept command
349 * for client side. This ppid is the one from the
350 * external process that spawned us.
351 */
352 if (config.sig_parent) {
353 kill(ppid, SIGUSR1);
354 }
355
356 /*
357 * Notify the parent of the fork() process that we are
358 * ready.
359 */
360 if (config.daemonize || config.background) {
361 kill(child_ppid, SIGUSR1);
362 }
363 }
364
365 LTTNG_HIDDEN
366 void sessiond_notify_ready(void)
367 {
368 /*
369 * This memory barrier is paired with the one performed by
370 * the client thread after it has seen that 'lttng_sessiond_ready' is 0.
371 *
372 * The purpose of these memory barriers is to ensure that all
373 * initialization operations of the various threads that call this
374 * function to signal that they are ready are commited/published
375 * before the client thread can see the 'lttng_sessiond_ready' counter
376 * reach 0.
377 *
378 * Note that this could be a 'write' memory barrier, but a full barrier
379 * is used in case the code using this utility changes. The performance
380 * implications of this choice are minimal since this is a slow path.
381 */
382 cmm_smp_mb();
383 uatomic_sub(&lttng_sessiond_ready, 1);
384 }
385
386 static
387 int __sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size,
388 int *a_pipe)
389 {
390 int ret;
391
392 assert(events);
393
394 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
395 if (ret < 0) {
396 goto error;
397 }
398
399 /* Add quit pipe */
400 ret = lttng_poll_add(events, a_pipe[0], LPOLLIN | LPOLLERR);
401 if (ret < 0) {
402 goto error;
403 }
404
405 return 0;
406
407 error:
408 return ret;
409 }
410
411 /*
412 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
413 */
414 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
415 {
416 return __sessiond_set_thread_pollset(events, size, thread_quit_pipe);
417 }
418
419 /*
420 * Init thread quit pipe.
421 *
422 * Return -1 on error or 0 if all pipes are created.
423 */
424 static int __init_thread_quit_pipe(int *a_pipe)
425 {
426 int ret, i;
427
428 ret = pipe(a_pipe);
429 if (ret < 0) {
430 PERROR("thread quit pipe");
431 goto error;
432 }
433
434 for (i = 0; i < 2; i++) {
435 ret = fcntl(a_pipe[i], F_SETFD, FD_CLOEXEC);
436 if (ret < 0) {
437 PERROR("fcntl");
438 goto error;
439 }
440 }
441
442 error:
443 return ret;
444 }
445
446 static int init_thread_quit_pipe(void)
447 {
448 return __init_thread_quit_pipe(thread_quit_pipe);
449 }
450
451 /*
452 * Stop all threads by closing the thread quit pipe.
453 */
454 static void stop_threads(void)
455 {
456 int ret;
457
458 /* Stopping all threads */
459 DBG("Terminating all threads");
460 ret = notify_thread_pipe(thread_quit_pipe[1]);
461 if (ret < 0) {
462 ERR("write error on thread quit pipe");
463 }
464
465 /* Dispatch thread */
466 CMM_STORE_SHARED(dispatch_thread_exit, 1);
467 futex_nto1_wake(&ust_cmd_queue.futex);
468 }
469
470 /*
471 * Close every consumer sockets.
472 */
473 static void close_consumer_sockets(void)
474 {
475 int ret;
476
477 if (kconsumer_data.err_sock >= 0) {
478 ret = close(kconsumer_data.err_sock);
479 if (ret < 0) {
480 PERROR("kernel consumer err_sock close");
481 }
482 }
483 if (ustconsumer32_data.err_sock >= 0) {
484 ret = close(ustconsumer32_data.err_sock);
485 if (ret < 0) {
486 PERROR("UST consumerd32 err_sock close");
487 }
488 }
489 if (ustconsumer64_data.err_sock >= 0) {
490 ret = close(ustconsumer64_data.err_sock);
491 if (ret < 0) {
492 PERROR("UST consumerd64 err_sock close");
493 }
494 }
495 if (kconsumer_data.cmd_sock >= 0) {
496 ret = close(kconsumer_data.cmd_sock);
497 if (ret < 0) {
498 PERROR("kernel consumer cmd_sock close");
499 }
500 }
501 if (ustconsumer32_data.cmd_sock >= 0) {
502 ret = close(ustconsumer32_data.cmd_sock);
503 if (ret < 0) {
504 PERROR("UST consumerd32 cmd_sock close");
505 }
506 }
507 if (ustconsumer64_data.cmd_sock >= 0) {
508 ret = close(ustconsumer64_data.cmd_sock);
509 if (ret < 0) {
510 PERROR("UST consumerd64 cmd_sock close");
511 }
512 }
513 if (kconsumer_data.channel_monitor_pipe >= 0) {
514 ret = close(kconsumer_data.channel_monitor_pipe);
515 if (ret < 0) {
516 PERROR("kernel consumer channel monitor pipe close");
517 }
518 }
519 if (ustconsumer32_data.channel_monitor_pipe >= 0) {
520 ret = close(ustconsumer32_data.channel_monitor_pipe);
521 if (ret < 0) {
522 PERROR("UST consumerd32 channel monitor pipe close");
523 }
524 }
525 if (ustconsumer64_data.channel_monitor_pipe >= 0) {
526 ret = close(ustconsumer64_data.channel_monitor_pipe);
527 if (ret < 0) {
528 PERROR("UST consumerd64 channel monitor pipe close");
529 }
530 }
531 if (kconsumer_data.channel_rotate_pipe >= 0) {
532 ret = close(kconsumer_data.channel_rotate_pipe);
533 if (ret < 0) {
534 PERROR("kernel consumer channel rotate pipe close");
535 }
536 }
537 if (ustconsumer32_data.channel_rotate_pipe >= 0) {
538 ret = close(ustconsumer32_data.channel_rotate_pipe);
539 if (ret < 0) {
540 PERROR("UST consumerd32 channel rotate pipe close");
541 }
542 }
543 if (ustconsumer64_data.channel_rotate_pipe >= 0) {
544 ret = close(ustconsumer64_data.channel_rotate_pipe);
545 if (ret < 0) {
546 PERROR("UST consumerd64 channel rotate pipe close");
547 }
548 }
549 }
550
551 /*
552 * Wait on consumer process termination.
553 *
554 * Need to be called with the consumer data lock held or from a context
555 * ensuring no concurrent access to data (e.g: cleanup).
556 */
557 static void wait_consumer(struct consumer_data *consumer_data)
558 {
559 pid_t ret;
560 int status;
561
562 if (consumer_data->pid <= 0) {
563 return;
564 }
565
566 DBG("Waiting for complete teardown of consumerd (PID: %d)",
567 consumer_data->pid);
568 ret = waitpid(consumer_data->pid, &status, 0);
569 if (ret == -1) {
570 PERROR("consumerd waitpid pid: %d", consumer_data->pid)
571 } else if (!WIFEXITED(status)) {
572 ERR("consumerd termination with error: %d",
573 WEXITSTATUS(ret));
574 }
575 consumer_data->pid = 0;
576 }
577
578 /*
579 * Cleanup the session daemon's data structures.
580 */
581 static void sessiond_cleanup(void)
582 {
583 int ret;
584 struct ltt_session *sess, *stmp;
585
586 DBG("Cleanup sessiond");
587
588 /*
589 * Close the thread quit pipe. It has already done its job,
590 * since we are now called.
591 */
592 utils_close_pipe(thread_quit_pipe);
593
594 /*
595 * If config.pid_file_path.value is undefined, the default file will be
596 * wiped when removing the rundir.
597 */
598 if (config.pid_file_path.value) {
599 ret = remove(config.pid_file_path.value);
600 if (ret < 0) {
601 PERROR("remove pidfile %s", config.pid_file_path.value);
602 }
603 }
604
605 DBG("Removing sessiond and consumerd content of directory %s",
606 config.rundir.value);
607
608 /* sessiond */
609 DBG("Removing %s", config.pid_file_path.value);
610 (void) unlink(config.pid_file_path.value);
611
612 DBG("Removing %s", config.agent_port_file_path.value);
613 (void) unlink(config.agent_port_file_path.value);
614
615 /* kconsumerd */
616 DBG("Removing %s", kconsumer_data.err_unix_sock_path);
617 (void) unlink(kconsumer_data.err_unix_sock_path);
618
619 DBG("Removing directory %s", config.kconsumerd_path.value);
620 (void) rmdir(config.kconsumerd_path.value);
621
622 /* ust consumerd 32 */
623 DBG("Removing %s", config.consumerd32_err_unix_sock_path.value);
624 (void) unlink(config.consumerd32_err_unix_sock_path.value);
625
626 DBG("Removing directory %s", config.consumerd32_path.value);
627 (void) rmdir(config.consumerd32_path.value);
628
629 /* ust consumerd 64 */
630 DBG("Removing %s", config.consumerd64_err_unix_sock_path.value);
631 (void) unlink(config.consumerd64_err_unix_sock_path.value);
632
633 DBG("Removing directory %s", config.consumerd64_path.value);
634 (void) rmdir(config.consumerd64_path.value);
635
636 DBG("Cleaning up all sessions");
637
638 /* Destroy session list mutex */
639 if (session_list_ptr != NULL) {
640 pthread_mutex_destroy(&session_list_ptr->lock);
641
642 /* Cleanup ALL session */
643 cds_list_for_each_entry_safe(sess, stmp,
644 &session_list_ptr->head, list) {
645 cmd_destroy_session(sess, kernel_poll_pipe[1],
646 notification_thread_handle);
647 }
648 }
649
650 wait_consumer(&kconsumer_data);
651 wait_consumer(&ustconsumer64_data);
652 wait_consumer(&ustconsumer32_data);
653
654 DBG("Cleaning up all agent apps");
655 agent_app_ht_clean();
656
657 DBG("Closing all UST sockets");
658 ust_app_clean_list();
659 buffer_reg_destroy_registries();
660
661 if (is_root && !config.no_kernel) {
662 DBG2("Closing kernel fd");
663 if (kernel_tracer_fd >= 0) {
664 ret = close(kernel_tracer_fd);
665 if (ret) {
666 PERROR("close");
667 }
668 }
669 DBG("Unloading kernel modules");
670 modprobe_remove_lttng_all();
671 free(syscall_table);
672 }
673
674 close_consumer_sockets();
675
676 if (load_info) {
677 load_session_destroy_data(load_info);
678 free(load_info);
679 }
680
681 /*
682 * We do NOT rmdir rundir because there are other processes
683 * using it, for instance lttng-relayd, which can start in
684 * parallel with this teardown.
685 */
686 }
687
688 /*
689 * Cleanup the daemon's option data structures.
690 */
691 static void sessiond_cleanup_options(void)
692 {
693 DBG("Cleaning up options");
694
695 sessiond_config_fini(&config);
696
697 run_as_destroy_worker();
698 }
699
700 /*
701 * Send data on a unix socket using the liblttsessiondcomm API.
702 *
703 * Return lttcomm error code.
704 */
705 static int send_unix_sock(int sock, void *buf, size_t len)
706 {
707 /* Check valid length */
708 if (len == 0) {
709 return -1;
710 }
711
712 return lttcomm_send_unix_sock(sock, buf, len);
713 }
714
715 /*
716 * Free memory of a command context structure.
717 */
718 static void clean_command_ctx(struct command_ctx **cmd_ctx)
719 {
720 DBG("Clean command context structure");
721 if (*cmd_ctx) {
722 if ((*cmd_ctx)->llm) {
723 free((*cmd_ctx)->llm);
724 }
725 if ((*cmd_ctx)->lsm) {
726 free((*cmd_ctx)->lsm);
727 }
728 free(*cmd_ctx);
729 *cmd_ctx = NULL;
730 }
731 }
732
733 /*
734 * Notify UST applications using the shm mmap futex.
735 */
736 static int notify_ust_apps(int active)
737 {
738 char *wait_shm_mmap;
739
740 DBG("Notifying applications of session daemon state: %d", active);
741
742 /* See shm.c for this call implying mmap, shm and futex calls */
743 wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root);
744 if (wait_shm_mmap == NULL) {
745 goto error;
746 }
747
748 /* Wake waiting process */
749 futex_wait_update((int32_t *) wait_shm_mmap, active);
750
751 /* Apps notified successfully */
752 return 0;
753
754 error:
755 return -1;
756 }
757
758 /*
759 * Setup the outgoing data buffer for the response (llm) by allocating the
760 * right amount of memory and copying the original information from the lsm
761 * structure.
762 *
763 * Return 0 on success, negative value on error.
764 */
765 static int setup_lttng_msg(struct command_ctx *cmd_ctx,
766 const void *payload_buf, size_t payload_len,
767 const void *cmd_header_buf, size_t cmd_header_len)
768 {
769 int ret = 0;
770 const size_t header_len = sizeof(struct lttcomm_lttng_msg);
771 const size_t cmd_header_offset = header_len;
772 const size_t payload_offset = cmd_header_offset + cmd_header_len;
773 const size_t total_msg_size = header_len + cmd_header_len + payload_len;
774
775 cmd_ctx->llm = zmalloc(total_msg_size);
776
777 if (cmd_ctx->llm == NULL) {
778 PERROR("zmalloc");
779 ret = -ENOMEM;
780 goto end;
781 }
782
783 /* Copy common data */
784 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
785 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
786 cmd_ctx->llm->cmd_header_size = cmd_header_len;
787 cmd_ctx->llm->data_size = payload_len;
788 cmd_ctx->lttng_msg_size = total_msg_size;
789
790 /* Copy command header */
791 if (cmd_header_len) {
792 memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf,
793 cmd_header_len);
794 }
795
796 /* Copy payload */
797 if (payload_len) {
798 memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf,
799 payload_len);
800 }
801
802 end:
803 return ret;
804 }
805
806 /*
807 * Version of setup_lttng_msg() without command header.
808 */
809 static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx,
810 void *payload_buf, size_t payload_len)
811 {
812 return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0);
813 }
814 /*
815 * Update the kernel poll set of all channel fd available over all tracing
816 * session. Add the wakeup pipe at the end of the set.
817 */
818 static int update_kernel_poll(struct lttng_poll_event *events)
819 {
820 int ret;
821 struct ltt_session *session;
822 struct ltt_kernel_channel *channel;
823
824 DBG("Updating kernel poll set");
825
826 session_lock_list();
827 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
828 session_lock(session);
829 if (session->kernel_session == NULL) {
830 session_unlock(session);
831 continue;
832 }
833
834 cds_list_for_each_entry(channel,
835 &session->kernel_session->channel_list.head, list) {
836 /* Add channel fd to the kernel poll set */
837 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
838 if (ret < 0) {
839 session_unlock(session);
840 goto error;
841 }
842 DBG("Channel fd %d added to kernel set", channel->fd);
843 }
844 session_unlock(session);
845 }
846 session_unlock_list();
847
848 return 0;
849
850 error:
851 session_unlock_list();
852 return -1;
853 }
854
855 /*
856 * Find the channel fd from 'fd' over all tracing session. When found, check
857 * for new channel stream and send those stream fds to the kernel consumer.
858 *
859 * Useful for CPU hotplug feature.
860 */
861 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
862 {
863 int ret = 0;
864 struct ltt_session *session;
865 struct ltt_kernel_session *ksess;
866 struct ltt_kernel_channel *channel;
867
868 DBG("Updating kernel streams for channel fd %d", fd);
869
870 session_lock_list();
871 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
872 session_lock(session);
873 if (session->kernel_session == NULL) {
874 session_unlock(session);
875 continue;
876 }
877 ksess = session->kernel_session;
878
879 cds_list_for_each_entry(channel,
880 &ksess->channel_list.head, list) {
881 struct lttng_ht_iter iter;
882 struct consumer_socket *socket;
883
884 if (channel->fd != fd) {
885 continue;
886 }
887 DBG("Channel found, updating kernel streams");
888 ret = kernel_open_channel_stream(channel);
889 if (ret < 0) {
890 goto error;
891 }
892 /* Update the stream global counter */
893 ksess->stream_count_global += ret;
894
895 /*
896 * Have we already sent fds to the consumer? If yes, it
897 * means that tracing is started so it is safe to send
898 * our updated stream fds.
899 */
900 if (ksess->consumer_fds_sent != 1
901 || ksess->consumer == NULL) {
902 ret = -1;
903 goto error;
904 }
905
906 rcu_read_lock();
907 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
908 &iter.iter, socket, node.node) {
909 pthread_mutex_lock(socket->lock);
910 ret = kernel_consumer_send_channel_streams(socket,
911 channel, ksess,
912 session->output_traces ? 1 : 0);
913 pthread_mutex_unlock(socket->lock);
914 if (ret < 0) {
915 rcu_read_unlock();
916 goto error;
917 }
918 }
919 rcu_read_unlock();
920 }
921 session_unlock(session);
922 }
923 session_unlock_list();
924 return ret;
925
926 error:
927 session_unlock(session);
928 session_unlock_list();
929 return ret;
930 }
931
932 /*
933 * For each tracing session, update newly registered apps. The session list
934 * lock MUST be acquired before calling this.
935 */
936 static void update_ust_app(int app_sock)
937 {
938 struct ltt_session *sess, *stmp;
939
940 /* Consumer is in an ERROR state. Stop any application update. */
941 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
942 /* Stop the update process since the consumer is dead. */
943 return;
944 }
945
946 /* For all tracing session(s) */
947 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
948 struct ust_app *app;
949
950 session_lock(sess);
951 if (!sess->ust_session) {
952 goto unlock_session;
953 }
954
955 rcu_read_lock();
956 assert(app_sock >= 0);
957 app = ust_app_find_by_sock(app_sock);
958 if (app == NULL) {
959 /*
960 * Application can be unregistered before so
961 * this is possible hence simply stopping the
962 * update.
963 */
964 DBG3("UST app update failed to find app sock %d",
965 app_sock);
966 goto unlock_rcu;
967 }
968 ust_app_global_update(sess->ust_session, app);
969 unlock_rcu:
970 rcu_read_unlock();
971 unlock_session:
972 session_unlock(sess);
973 }
974 }
975
976 /*
977 * This thread manage event coming from the kernel.
978 *
979 * Features supported in this thread:
980 * -) CPU Hotplug
981 */
982 static void *thread_manage_kernel(void *data)
983 {
984 int ret, i, pollfd, update_poll_flag = 1, err = -1;
985 uint32_t revents, nb_fd;
986 char tmp;
987 struct lttng_poll_event events;
988
989 DBG("[thread] Thread manage kernel started");
990
991 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
992
993 /*
994 * This first step of the while is to clean this structure which could free
995 * non NULL pointers so initialize it before the loop.
996 */
997 lttng_poll_init(&events);
998
999 if (testpoint(sessiond_thread_manage_kernel)) {
1000 goto error_testpoint;
1001 }
1002
1003 health_code_update();
1004
1005 if (testpoint(sessiond_thread_manage_kernel_before_loop)) {
1006 goto error_testpoint;
1007 }
1008
1009 while (1) {
1010 health_code_update();
1011
1012 if (update_poll_flag == 1) {
1013 /* Clean events object. We are about to populate it again. */
1014 lttng_poll_clean(&events);
1015
1016 ret = sessiond_set_thread_pollset(&events, 2);
1017 if (ret < 0) {
1018 goto error_poll_create;
1019 }
1020
1021 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
1022 if (ret < 0) {
1023 goto error;
1024 }
1025
1026 /* This will add the available kernel channel if any. */
1027 ret = update_kernel_poll(&events);
1028 if (ret < 0) {
1029 goto error;
1030 }
1031 update_poll_flag = 0;
1032 }
1033
1034 DBG("Thread kernel polling");
1035
1036 /* Poll infinite value of time */
1037 restart:
1038 health_poll_entry();
1039 ret = lttng_poll_wait(&events, -1);
1040 DBG("Thread kernel return from poll on %d fds",
1041 LTTNG_POLL_GETNB(&events));
1042 health_poll_exit();
1043 if (ret < 0) {
1044 /*
1045 * Restart interrupted system call.
1046 */
1047 if (errno == EINTR) {
1048 goto restart;
1049 }
1050 goto error;
1051 } else if (ret == 0) {
1052 /* Should not happen since timeout is infinite */
1053 ERR("Return value of poll is 0 with an infinite timeout.\n"
1054 "This should not have happened! Continuing...");
1055 continue;
1056 }
1057
1058 nb_fd = ret;
1059
1060 for (i = 0; i < nb_fd; i++) {
1061 /* Fetch once the poll data */
1062 revents = LTTNG_POLL_GETEV(&events, i);
1063 pollfd = LTTNG_POLL_GETFD(&events, i);
1064
1065 health_code_update();
1066
1067 if (!revents) {
1068 /* No activity for this FD (poll implementation). */
1069 continue;
1070 }
1071
1072 /* Thread quit pipe has been closed. Killing thread. */
1073 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1074 if (ret) {
1075 err = 0;
1076 goto exit;
1077 }
1078
1079 /* Check for data on kernel pipe */
1080 if (revents & LPOLLIN) {
1081 if (pollfd == kernel_poll_pipe[0]) {
1082 (void) lttng_read(kernel_poll_pipe[0],
1083 &tmp, 1);
1084 /*
1085 * Ret value is useless here, if this pipe gets any actions an
1086 * update is required anyway.
1087 */
1088 update_poll_flag = 1;
1089 continue;
1090 } else {
1091 /*
1092 * New CPU detected by the kernel. Adding kernel stream to
1093 * kernel session and updating the kernel consumer
1094 */
1095 ret = update_kernel_stream(&kconsumer_data, pollfd);
1096 if (ret < 0) {
1097 continue;
1098 }
1099 break;
1100 }
1101 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1102 update_poll_flag = 1;
1103 continue;
1104 } else {
1105 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1106 goto error;
1107 }
1108 }
1109 }
1110
1111 exit:
1112 error:
1113 lttng_poll_clean(&events);
1114 error_poll_create:
1115 error_testpoint:
1116 utils_close_pipe(kernel_poll_pipe);
1117 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
1118 if (err) {
1119 health_error();
1120 ERR("Health error occurred in %s", __func__);
1121 WARN("Kernel thread died unexpectedly. "
1122 "Kernel tracing can continue but CPU hotplug is disabled.");
1123 }
1124 health_unregister(health_sessiond);
1125 DBG("Kernel thread dying");
1126 return NULL;
1127 }
1128
1129 /*
1130 * Signal pthread condition of the consumer data that the thread.
1131 */
1132 static void signal_consumer_condition(struct consumer_data *data, int state)
1133 {
1134 pthread_mutex_lock(&data->cond_mutex);
1135
1136 /*
1137 * The state is set before signaling. It can be any value, it's the waiter
1138 * job to correctly interpret this condition variable associated to the
1139 * consumer pthread_cond.
1140 *
1141 * A value of 0 means that the corresponding thread of the consumer data
1142 * was not started. 1 indicates that the thread has started and is ready
1143 * for action. A negative value means that there was an error during the
1144 * thread bootstrap.
1145 */
1146 data->consumer_thread_is_ready = state;
1147 (void) pthread_cond_signal(&data->cond);
1148
1149 pthread_mutex_unlock(&data->cond_mutex);
1150 }
1151
1152 /*
1153 * This thread manage the consumer error sent back to the session daemon.
1154 */
1155 static void *thread_manage_consumer(void *data)
1156 {
1157 int sock = -1, i, ret, pollfd, err = -1, should_quit = 0;
1158 uint32_t revents, nb_fd;
1159 enum lttcomm_return_code code;
1160 struct lttng_poll_event events;
1161 struct consumer_data *consumer_data = data;
1162 struct consumer_socket *cmd_socket_wrapper = NULL;
1163
1164 DBG("[thread] Manage consumer started");
1165
1166 rcu_register_thread();
1167 rcu_thread_online();
1168
1169 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
1170
1171 health_code_update();
1172
1173 /*
1174 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1175 * metadata_sock. Nothing more will be added to this poll set.
1176 */
1177 ret = sessiond_set_thread_pollset(&events, 3);
1178 if (ret < 0) {
1179 goto error_poll;
1180 }
1181
1182 /*
1183 * The error socket here is already in a listening state which was done
1184 * just before spawning this thread to avoid a race between the consumer
1185 * daemon exec trying to connect and the listen() call.
1186 */
1187 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
1188 if (ret < 0) {
1189 goto error;
1190 }
1191
1192 health_code_update();
1193
1194 /* Infinite blocking call, waiting for transmission */
1195 restart:
1196 health_poll_entry();
1197
1198 if (testpoint(sessiond_thread_manage_consumer)) {
1199 goto error;
1200 }
1201
1202 ret = lttng_poll_wait(&events, -1);
1203 health_poll_exit();
1204 if (ret < 0) {
1205 /*
1206 * Restart interrupted system call.
1207 */
1208 if (errno == EINTR) {
1209 goto restart;
1210 }
1211 goto error;
1212 }
1213
1214 nb_fd = ret;
1215
1216 for (i = 0; i < nb_fd; i++) {
1217 /* Fetch once the poll data */
1218 revents = LTTNG_POLL_GETEV(&events, i);
1219 pollfd = LTTNG_POLL_GETFD(&events, i);
1220
1221 health_code_update();
1222
1223 if (!revents) {
1224 /* No activity for this FD (poll implementation). */
1225 continue;
1226 }
1227
1228 /* Thread quit pipe has been closed. Killing thread. */
1229 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1230 if (ret) {
1231 err = 0;
1232 goto exit;
1233 }
1234
1235 /* Event on the registration socket */
1236 if (pollfd == consumer_data->err_sock) {
1237 if (revents & LPOLLIN) {
1238 continue;
1239 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1240 ERR("consumer err socket poll error");
1241 goto error;
1242 } else {
1243 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1244 goto error;
1245 }
1246 }
1247 }
1248
1249 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1250 if (sock < 0) {
1251 goto error;
1252 }
1253
1254 /*
1255 * Set the CLOEXEC flag. Return code is useless because either way, the
1256 * show must go on.
1257 */
1258 (void) utils_set_fd_cloexec(sock);
1259
1260 health_code_update();
1261
1262 DBG2("Receiving code from consumer err_sock");
1263
1264 /* Getting status code from kconsumerd */
1265 ret = lttcomm_recv_unix_sock(sock, &code,
1266 sizeof(enum lttcomm_return_code));
1267 if (ret <= 0) {
1268 goto error;
1269 }
1270
1271 health_code_update();
1272 if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
1273 ERR("consumer error when waiting for SOCK_READY : %s",
1274 lttcomm_get_readable_code(-code));
1275 goto error;
1276 }
1277
1278 /* Connect both command and metadata sockets. */
1279 consumer_data->cmd_sock =
1280 lttcomm_connect_unix_sock(
1281 consumer_data->cmd_unix_sock_path);
1282 consumer_data->metadata_fd =
1283 lttcomm_connect_unix_sock(
1284 consumer_data->cmd_unix_sock_path);
1285 if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) {
1286 PERROR("consumer connect cmd socket");
1287 /* On error, signal condition and quit. */
1288 signal_consumer_condition(consumer_data, -1);
1289 goto error;
1290 }
1291
1292 consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
1293
1294 /* Create metadata socket lock. */
1295 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
1296 if (consumer_data->metadata_sock.lock == NULL) {
1297 PERROR("zmalloc pthread mutex");
1298 goto error;
1299 }
1300 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
1301
1302 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
1303 DBG("Consumer metadata socket ready (fd: %d)",
1304 consumer_data->metadata_fd);
1305
1306 /*
1307 * Remove the consumerd error sock since we've established a connection.
1308 */
1309 ret = lttng_poll_del(&events, consumer_data->err_sock);
1310 if (ret < 0) {
1311 goto error;
1312 }
1313
1314 /* Add new accepted error socket. */
1315 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1316 if (ret < 0) {
1317 goto error;
1318 }
1319
1320 /* Add metadata socket that is successfully connected. */
1321 ret = lttng_poll_add(&events, consumer_data->metadata_fd,
1322 LPOLLIN | LPOLLRDHUP);
1323 if (ret < 0) {
1324 goto error;
1325 }
1326
1327 health_code_update();
1328
1329 /*
1330 * Transfer the write-end of the channel monitoring and rotate pipe
1331 * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE and
1332 * SET_CHANNEL_ROTATE_PIPE commands.
1333 */
1334 cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock);
1335 if (!cmd_socket_wrapper) {
1336 goto error;
1337 }
1338 cmd_socket_wrapper->lock = &consumer_data->lock;
1339
1340 ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper,
1341 consumer_data->channel_monitor_pipe);
1342 if (ret) {
1343 goto error;
1344 }
1345
1346 ret = consumer_send_channel_rotate_pipe(cmd_socket_wrapper,
1347 consumer_data->channel_rotate_pipe);
1348 if (ret) {
1349 goto error;
1350 }
1351
1352 /* Discard the socket wrapper as it is no longer needed. */
1353 consumer_destroy_socket(cmd_socket_wrapper);
1354 cmd_socket_wrapper = NULL;
1355
1356 /* The thread is completely initialized, signal that it is ready. */
1357 signal_consumer_condition(consumer_data, 1);
1358
1359 /* Infinite blocking call, waiting for transmission */
1360 restart_poll:
1361 while (1) {
1362 health_code_update();
1363
1364 /* Exit the thread because the thread quit pipe has been triggered. */
1365 if (should_quit) {
1366 /* Not a health error. */
1367 err = 0;
1368 goto exit;
1369 }
1370
1371 health_poll_entry();
1372 ret = lttng_poll_wait(&events, -1);
1373 health_poll_exit();
1374 if (ret < 0) {
1375 /*
1376 * Restart interrupted system call.
1377 */
1378 if (errno == EINTR) {
1379 goto restart_poll;
1380 }
1381 goto error;
1382 }
1383
1384 nb_fd = ret;
1385
1386 for (i = 0; i < nb_fd; i++) {
1387 /* Fetch once the poll data */
1388 revents = LTTNG_POLL_GETEV(&events, i);
1389 pollfd = LTTNG_POLL_GETFD(&events, i);
1390
1391 health_code_update();
1392
1393 if (!revents) {
1394 /* No activity for this FD (poll implementation). */
1395 continue;
1396 }
1397
1398 /*
1399 * Thread quit pipe has been triggered, flag that we should stop
1400 * but continue the current loop to handle potential data from
1401 * consumer.
1402 */
1403 should_quit = sessiond_check_thread_quit_pipe(pollfd, revents);
1404
1405 if (pollfd == sock) {
1406 /* Event on the consumerd socket */
1407 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
1408 && !(revents & LPOLLIN)) {
1409 ERR("consumer err socket second poll error");
1410 goto error;
1411 }
1412 health_code_update();
1413 /* Wait for any kconsumerd error */
1414 ret = lttcomm_recv_unix_sock(sock, &code,
1415 sizeof(enum lttcomm_return_code));
1416 if (ret <= 0) {
1417 ERR("consumer closed the command socket");
1418 goto error;
1419 }
1420
1421 ERR("consumer return code : %s",
1422 lttcomm_get_readable_code(-code));
1423
1424 goto exit;
1425 } else if (pollfd == consumer_data->metadata_fd) {
1426 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)
1427 && !(revents & LPOLLIN)) {
1428 ERR("consumer err metadata socket second poll error");
1429 goto error;
1430 }
1431 /* UST metadata requests */
1432 ret = ust_consumer_metadata_request(
1433 &consumer_data->metadata_sock);
1434 if (ret < 0) {
1435 ERR("Handling metadata request");
1436 goto error;
1437 }
1438 }
1439 /* No need for an else branch all FDs are tested prior. */
1440 }
1441 health_code_update();
1442 }
1443
1444 exit:
1445 error:
1446 /*
1447 * We lock here because we are about to close the sockets and some other
1448 * thread might be using them so get exclusive access which will abort all
1449 * other consumer command by other threads.
1450 */
1451 pthread_mutex_lock(&consumer_data->lock);
1452
1453 /* Immediately set the consumerd state to stopped */
1454 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1455 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1456 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1457 consumer_data->type == LTTNG_CONSUMER32_UST) {
1458 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1459 } else {
1460 /* Code flow error... */
1461 assert(0);
1462 }
1463
1464 if (consumer_data->err_sock >= 0) {
1465 ret = close(consumer_data->err_sock);
1466 if (ret) {
1467 PERROR("close");
1468 }
1469 consumer_data->err_sock = -1;
1470 }
1471 if (consumer_data->cmd_sock >= 0) {
1472 ret = close(consumer_data->cmd_sock);
1473 if (ret) {
1474 PERROR("close");
1475 }
1476 consumer_data->cmd_sock = -1;
1477 }
1478 if (consumer_data->metadata_sock.fd_ptr &&
1479 *consumer_data->metadata_sock.fd_ptr >= 0) {
1480 ret = close(*consumer_data->metadata_sock.fd_ptr);
1481 if (ret) {
1482 PERROR("close");
1483 }
1484 }
1485 if (sock >= 0) {
1486 ret = close(sock);
1487 if (ret) {
1488 PERROR("close");
1489 }
1490 }
1491
1492 unlink(consumer_data->err_unix_sock_path);
1493 unlink(consumer_data->cmd_unix_sock_path);
1494 pthread_mutex_unlock(&consumer_data->lock);
1495
1496 /* Cleanup metadata socket mutex. */
1497 if (consumer_data->metadata_sock.lock) {
1498 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1499 free(consumer_data->metadata_sock.lock);
1500 }
1501 lttng_poll_clean(&events);
1502
1503 if (cmd_socket_wrapper) {
1504 consumer_destroy_socket(cmd_socket_wrapper);
1505 }
1506 error_poll:
1507 if (err) {
1508 health_error();
1509 ERR("Health error occurred in %s", __func__);
1510 }
1511 health_unregister(health_sessiond);
1512 DBG("consumer thread cleanup completed");
1513
1514 rcu_thread_offline();
1515 rcu_unregister_thread();
1516
1517 return NULL;
1518 }
1519
1520 /*
1521 * This thread receives application command sockets (FDs) on the
1522 * apps_cmd_pipe and waits (polls) on them until they are closed
1523 * or an error occurs.
1524 *
1525 * At that point, it flushes the data (tracing and metadata) associated
1526 * with this application and tears down ust app sessions and other
1527 * associated data structures through ust_app_unregister().
1528 *
1529 * Note that this thread never sends commands to the applications
1530 * through the command sockets; it merely listens for hang-ups
1531 * and errors on those sockets and cleans-up as they occur.
1532 */
1533 static void *thread_manage_apps(void *data)
1534 {
1535 int i, ret, pollfd, err = -1;
1536 ssize_t size_ret;
1537 uint32_t revents, nb_fd;
1538 struct lttng_poll_event events;
1539
1540 DBG("[thread] Manage application started");
1541
1542 rcu_register_thread();
1543 rcu_thread_online();
1544
1545 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
1546
1547 if (testpoint(sessiond_thread_manage_apps)) {
1548 goto error_testpoint;
1549 }
1550
1551 health_code_update();
1552
1553 ret = sessiond_set_thread_pollset(&events, 2);
1554 if (ret < 0) {
1555 goto error_poll_create;
1556 }
1557
1558 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1559 if (ret < 0) {
1560 goto error;
1561 }
1562
1563 if (testpoint(sessiond_thread_manage_apps_before_loop)) {
1564 goto error;
1565 }
1566
1567 health_code_update();
1568
1569 while (1) {
1570 DBG("Apps thread polling");
1571
1572 /* Inifinite blocking call, waiting for transmission */
1573 restart:
1574 health_poll_entry();
1575 ret = lttng_poll_wait(&events, -1);
1576 DBG("Apps thread return from poll on %d fds",
1577 LTTNG_POLL_GETNB(&events));
1578 health_poll_exit();
1579 if (ret < 0) {
1580 /*
1581 * Restart interrupted system call.
1582 */
1583 if (errno == EINTR) {
1584 goto restart;
1585 }
1586 goto error;
1587 }
1588
1589 nb_fd = ret;
1590
1591 for (i = 0; i < nb_fd; i++) {
1592 /* Fetch once the poll data */
1593 revents = LTTNG_POLL_GETEV(&events, i);
1594 pollfd = LTTNG_POLL_GETFD(&events, i);
1595
1596 health_code_update();
1597
1598 if (!revents) {
1599 /* No activity for this FD (poll implementation). */
1600 continue;
1601 }
1602
1603 /* Thread quit pipe has been closed. Killing thread. */
1604 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1605 if (ret) {
1606 err = 0;
1607 goto exit;
1608 }
1609
1610 /* Inspect the apps cmd pipe */
1611 if (pollfd == apps_cmd_pipe[0]) {
1612 if (revents & LPOLLIN) {
1613 int sock;
1614
1615 /* Empty pipe */
1616 size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
1617 if (size_ret < sizeof(sock)) {
1618 PERROR("read apps cmd pipe");
1619 goto error;
1620 }
1621
1622 health_code_update();
1623
1624 /*
1625 * Since this is a command socket (write then read),
1626 * we only monitor the error events of the socket.
1627 */
1628 ret = lttng_poll_add(&events, sock,
1629 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1630 if (ret < 0) {
1631 goto error;
1632 }
1633
1634 DBG("Apps with sock %d added to poll set", sock);
1635 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1636 ERR("Apps command pipe error");
1637 goto error;
1638 } else {
1639 ERR("Unknown poll events %u for sock %d", revents, pollfd);
1640 goto error;
1641 }
1642 } else {
1643 /*
1644 * At this point, we know that a registered application made
1645 * the event at poll_wait.
1646 */
1647 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1648 /* Removing from the poll set */
1649 ret = lttng_poll_del(&events, pollfd);
1650 if (ret < 0) {
1651 goto error;
1652 }
1653
1654 /* Socket closed on remote end. */
1655 ust_app_unregister(pollfd);
1656 } else {
1657 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1658 goto error;
1659 }
1660 }
1661
1662 health_code_update();
1663 }
1664 }
1665
1666 exit:
1667 error:
1668 lttng_poll_clean(&events);
1669 error_poll_create:
1670 error_testpoint:
1671 utils_close_pipe(apps_cmd_pipe);
1672 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1673
1674 /*
1675 * We don't clean the UST app hash table here since already registered
1676 * applications can still be controlled so let them be until the session
1677 * daemon dies or the applications stop.
1678 */
1679
1680 if (err) {
1681 health_error();
1682 ERR("Health error occurred in %s", __func__);
1683 }
1684 health_unregister(health_sessiond);
1685 DBG("Application communication apps thread cleanup complete");
1686 rcu_thread_offline();
1687 rcu_unregister_thread();
1688 return NULL;
1689 }
1690
1691 /*
1692 * Send a socket to a thread This is called from the dispatch UST registration
1693 * thread once all sockets are set for the application.
1694 *
1695 * The sock value can be invalid, we don't really care, the thread will handle
1696 * it and make the necessary cleanup if so.
1697 *
1698 * On success, return 0 else a negative value being the errno message of the
1699 * write().
1700 */
1701 static int send_socket_to_thread(int fd, int sock)
1702 {
1703 ssize_t ret;
1704
1705 /*
1706 * It's possible that the FD is set as invalid with -1 concurrently just
1707 * before calling this function being a shutdown state of the thread.
1708 */
1709 if (fd < 0) {
1710 ret = -EBADF;
1711 goto error;
1712 }
1713
1714 ret = lttng_write(fd, &sock, sizeof(sock));
1715 if (ret < sizeof(sock)) {
1716 PERROR("write apps pipe %d", fd);
1717 if (ret < 0) {
1718 ret = -errno;
1719 }
1720 goto error;
1721 }
1722
1723 /* All good. Don't send back the write positive ret value. */
1724 ret = 0;
1725 error:
1726 return (int) ret;
1727 }
1728
1729 /*
1730 * Sanitize the wait queue of the dispatch registration thread meaning removing
1731 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1732 * notify socket is never received.
1733 */
1734 static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1735 {
1736 int ret, nb_fd = 0, i;
1737 unsigned int fd_added = 0;
1738 struct lttng_poll_event events;
1739 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1740
1741 assert(wait_queue);
1742
1743 lttng_poll_init(&events);
1744
1745 /* Just skip everything for an empty queue. */
1746 if (!wait_queue->count) {
1747 goto end;
1748 }
1749
1750 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1751 if (ret < 0) {
1752 goto error_create;
1753 }
1754
1755 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1756 &wait_queue->head, head) {
1757 assert(wait_node->app);
1758 ret = lttng_poll_add(&events, wait_node->app->sock,
1759 LPOLLHUP | LPOLLERR);
1760 if (ret < 0) {
1761 goto error;
1762 }
1763
1764 fd_added = 1;
1765 }
1766
1767 if (!fd_added) {
1768 goto end;
1769 }
1770
1771 /*
1772 * Poll but don't block so we can quickly identify the faulty events and
1773 * clean them afterwards from the wait queue.
1774 */
1775 ret = lttng_poll_wait(&events, 0);
1776 if (ret < 0) {
1777 goto error;
1778 }
1779 nb_fd = ret;
1780
1781 for (i = 0; i < nb_fd; i++) {
1782 /* Get faulty FD. */
1783 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1784 int pollfd = LTTNG_POLL_GETFD(&events, i);
1785
1786 if (!revents) {
1787 /* No activity for this FD (poll implementation). */
1788 continue;
1789 }
1790
1791 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1792 &wait_queue->head, head) {
1793 if (pollfd == wait_node->app->sock &&
1794 (revents & (LPOLLHUP | LPOLLERR))) {
1795 cds_list_del(&wait_node->head);
1796 wait_queue->count--;
1797 ust_app_destroy(wait_node->app);
1798 free(wait_node);
1799 /*
1800 * Silence warning of use-after-free in
1801 * cds_list_for_each_entry_safe which uses
1802 * __typeof__(*wait_node).
1803 */
1804 wait_node = NULL;
1805 break;
1806 } else {
1807 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
1808 goto error;
1809 }
1810 }
1811 }
1812
1813 if (nb_fd > 0) {
1814 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1815 }
1816
1817 end:
1818 lttng_poll_clean(&events);
1819 return;
1820
1821 error:
1822 lttng_poll_clean(&events);
1823 error_create:
1824 ERR("Unable to sanitize wait queue");
1825 return;
1826 }
1827
1828 /*
1829 * Dispatch request from the registration threads to the application
1830 * communication thread.
1831 */
1832 static void *thread_dispatch_ust_registration(void *data)
1833 {
1834 int ret, err = -1;
1835 struct cds_wfcq_node *node;
1836 struct ust_command *ust_cmd = NULL;
1837 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1838 struct ust_reg_wait_queue wait_queue = {
1839 .count = 0,
1840 };
1841
1842 rcu_register_thread();
1843
1844 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
1845
1846 if (testpoint(sessiond_thread_app_reg_dispatch)) {
1847 goto error_testpoint;
1848 }
1849
1850 health_code_update();
1851
1852 CDS_INIT_LIST_HEAD(&wait_queue.head);
1853
1854 DBG("[thread] Dispatch UST command started");
1855
1856 for (;;) {
1857 health_code_update();
1858
1859 /* Atomically prepare the queue futex */
1860 futex_nto1_prepare(&ust_cmd_queue.futex);
1861
1862 if (CMM_LOAD_SHARED(dispatch_thread_exit)) {
1863 break;
1864 }
1865
1866 do {
1867 struct ust_app *app = NULL;
1868 ust_cmd = NULL;
1869
1870 /*
1871 * Make sure we don't have node(s) that have hung up before receiving
1872 * the notify socket. This is to clean the list in order to avoid
1873 * memory leaks from notify socket that are never seen.
1874 */
1875 sanitize_wait_queue(&wait_queue);
1876
1877 health_code_update();
1878 /* Dequeue command for registration */
1879 node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
1880 if (node == NULL) {
1881 DBG("Woken up but nothing in the UST command queue");
1882 /* Continue thread execution */
1883 break;
1884 }
1885
1886 ust_cmd = caa_container_of(node, struct ust_command, node);
1887
1888 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1889 " gid:%d sock:%d name:%s (version %d.%d)",
1890 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1891 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1892 ust_cmd->sock, ust_cmd->reg_msg.name,
1893 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1894
1895 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1896 wait_node = zmalloc(sizeof(*wait_node));
1897 if (!wait_node) {
1898 PERROR("zmalloc wait_node dispatch");
1899 ret = close(ust_cmd->sock);
1900 if (ret < 0) {
1901 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1902 }
1903 lttng_fd_put(LTTNG_FD_APPS, 1);
1904 free(ust_cmd);
1905 goto error;
1906 }
1907 CDS_INIT_LIST_HEAD(&wait_node->head);
1908
1909 /* Create application object if socket is CMD. */
1910 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1911 ust_cmd->sock);
1912 if (!wait_node->app) {
1913 ret = close(ust_cmd->sock);
1914 if (ret < 0) {
1915 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1916 }
1917 lttng_fd_put(LTTNG_FD_APPS, 1);
1918 free(wait_node);
1919 free(ust_cmd);
1920 continue;
1921 }
1922 /*
1923 * Add application to the wait queue so we can set the notify
1924 * socket before putting this object in the global ht.
1925 */
1926 cds_list_add(&wait_node->head, &wait_queue.head);
1927 wait_queue.count++;
1928
1929 free(ust_cmd);
1930 /*
1931 * We have to continue here since we don't have the notify
1932 * socket and the application MUST be added to the hash table
1933 * only at that moment.
1934 */
1935 continue;
1936 } else {
1937 /*
1938 * Look for the application in the local wait queue and set the
1939 * notify socket if found.
1940 */
1941 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1942 &wait_queue.head, head) {
1943 health_code_update();
1944 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1945 wait_node->app->notify_sock = ust_cmd->sock;
1946 cds_list_del(&wait_node->head);
1947 wait_queue.count--;
1948 app = wait_node->app;
1949 free(wait_node);
1950 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1951 break;
1952 }
1953 }
1954
1955 /*
1956 * With no application at this stage the received socket is
1957 * basically useless so close it before we free the cmd data
1958 * structure for good.
1959 */
1960 if (!app) {
1961 ret = close(ust_cmd->sock);
1962 if (ret < 0) {
1963 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1964 }
1965 lttng_fd_put(LTTNG_FD_APPS, 1);
1966 }
1967 free(ust_cmd);
1968 }
1969
1970 if (app) {
1971 /*
1972 * @session_lock_list
1973 *
1974 * Lock the global session list so from the register up to the
1975 * registration done message, no thread can see the application
1976 * and change its state.
1977 */
1978 session_lock_list();
1979 rcu_read_lock();
1980
1981 /*
1982 * Add application to the global hash table. This needs to be
1983 * done before the update to the UST registry can locate the
1984 * application.
1985 */
1986 ust_app_add(app);
1987
1988 /* Set app version. This call will print an error if needed. */
1989 (void) ust_app_version(app);
1990
1991 /* Send notify socket through the notify pipe. */
1992 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1993 app->notify_sock);
1994 if (ret < 0) {
1995 rcu_read_unlock();
1996 session_unlock_list();
1997 /*
1998 * No notify thread, stop the UST tracing. However, this is
1999 * not an internal error of the this thread thus setting
2000 * the health error code to a normal exit.
2001 */
2002 err = 0;
2003 goto error;
2004 }
2005
2006 /*
2007 * Update newly registered application with the tracing
2008 * registry info already enabled information.
2009 */
2010 update_ust_app(app->sock);
2011
2012 /*
2013 * Don't care about return value. Let the manage apps threads
2014 * handle app unregistration upon socket close.
2015 */
2016 (void) ust_app_register_done(app);
2017
2018 /*
2019 * Even if the application socket has been closed, send the app
2020 * to the thread and unregistration will take place at that
2021 * place.
2022 */
2023 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
2024 if (ret < 0) {
2025 rcu_read_unlock();
2026 session_unlock_list();
2027 /*
2028 * No apps. thread, stop the UST tracing. However, this is
2029 * not an internal error of the this thread thus setting
2030 * the health error code to a normal exit.
2031 */
2032 err = 0;
2033 goto error;
2034 }
2035
2036 rcu_read_unlock();
2037 session_unlock_list();
2038 }
2039 } while (node != NULL);
2040
2041 health_poll_entry();
2042 /* Futex wait on queue. Blocking call on futex() */
2043 futex_nto1_wait(&ust_cmd_queue.futex);
2044 health_poll_exit();
2045 }
2046 /* Normal exit, no error */
2047 err = 0;
2048
2049 error:
2050 /* Clean up wait queue. */
2051 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
2052 &wait_queue.head, head) {
2053 cds_list_del(&wait_node->head);
2054 wait_queue.count--;
2055 free(wait_node);
2056 }
2057
2058 /* Empty command queue. */
2059 for (;;) {
2060 /* Dequeue command for registration */
2061 node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail);
2062 if (node == NULL) {
2063 break;
2064 }
2065 ust_cmd = caa_container_of(node, struct ust_command, node);
2066 ret = close(ust_cmd->sock);
2067 if (ret < 0) {
2068 PERROR("close ust sock exit dispatch %d", ust_cmd->sock);
2069 }
2070 lttng_fd_put(LTTNG_FD_APPS, 1);
2071 free(ust_cmd);
2072 }
2073
2074 error_testpoint:
2075 DBG("Dispatch thread dying");
2076 if (err) {
2077 health_error();
2078 ERR("Health error occurred in %s", __func__);
2079 }
2080 health_unregister(health_sessiond);
2081 rcu_unregister_thread();
2082 return NULL;
2083 }
2084
2085 /*
2086 * This thread manage application registration.
2087 */
2088 static void *thread_registration_apps(void *data)
2089 {
2090 int sock = -1, i, ret, pollfd, err = -1;
2091 uint32_t revents, nb_fd;
2092 struct lttng_poll_event events;
2093 /*
2094 * Get allocated in this thread, enqueued to a global queue, dequeued and
2095 * freed in the manage apps thread.
2096 */
2097 struct ust_command *ust_cmd = NULL;
2098
2099 DBG("[thread] Manage application registration started");
2100
2101 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
2102
2103 if (testpoint(sessiond_thread_registration_apps)) {
2104 goto error_testpoint;
2105 }
2106
2107 ret = lttcomm_listen_unix_sock(apps_sock);
2108 if (ret < 0) {
2109 goto error_listen;
2110 }
2111
2112 /*
2113 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
2114 * more will be added to this poll set.
2115 */
2116 ret = sessiond_set_thread_pollset(&events, 2);
2117 if (ret < 0) {
2118 goto error_create_poll;
2119 }
2120
2121 /* Add the application registration socket */
2122 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
2123 if (ret < 0) {
2124 goto error_poll_add;
2125 }
2126
2127 /* Notify all applications to register */
2128 ret = notify_ust_apps(1);
2129 if (ret < 0) {
2130 ERR("Failed to notify applications or create the wait shared memory.\n"
2131 "Execution continues but there might be problem for already\n"
2132 "running applications that wishes to register.");
2133 }
2134
2135 while (1) {
2136 DBG("Accepting application registration");
2137
2138 /* Inifinite blocking call, waiting for transmission */
2139 restart:
2140 health_poll_entry();
2141 ret = lttng_poll_wait(&events, -1);
2142 health_poll_exit();
2143 if (ret < 0) {
2144 /*
2145 * Restart interrupted system call.
2146 */
2147 if (errno == EINTR) {
2148 goto restart;
2149 }
2150 goto error;
2151 }
2152
2153 nb_fd = ret;
2154
2155 for (i = 0; i < nb_fd; i++) {
2156 health_code_update();
2157
2158 /* Fetch once the poll data */
2159 revents = LTTNG_POLL_GETEV(&events, i);
2160 pollfd = LTTNG_POLL_GETFD(&events, i);
2161
2162 if (!revents) {
2163 /* No activity for this FD (poll implementation). */
2164 continue;
2165 }
2166
2167 /* Thread quit pipe has been closed. Killing thread. */
2168 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
2169 if (ret) {
2170 err = 0;
2171 goto exit;
2172 }
2173
2174 /* Event on the registration socket */
2175 if (pollfd == apps_sock) {
2176 if (revents & LPOLLIN) {
2177 sock = lttcomm_accept_unix_sock(apps_sock);
2178 if (sock < 0) {
2179 goto error;
2180 }
2181
2182 /*
2183 * Set socket timeout for both receiving and ending.
2184 * app_socket_timeout is in seconds, whereas
2185 * lttcomm_setsockopt_rcv_timeout and
2186 * lttcomm_setsockopt_snd_timeout expect msec as
2187 * parameter.
2188 */
2189 if (config.app_socket_timeout >= 0) {
2190 (void) lttcomm_setsockopt_rcv_timeout(sock,
2191 config.app_socket_timeout * 1000);
2192 (void) lttcomm_setsockopt_snd_timeout(sock,
2193 config.app_socket_timeout * 1000);
2194 }
2195
2196 /*
2197 * Set the CLOEXEC flag. Return code is useless because
2198 * either way, the show must go on.
2199 */
2200 (void) utils_set_fd_cloexec(sock);
2201
2202 /* Create UST registration command for enqueuing */
2203 ust_cmd = zmalloc(sizeof(struct ust_command));
2204 if (ust_cmd == NULL) {
2205 PERROR("ust command zmalloc");
2206 ret = close(sock);
2207 if (ret) {
2208 PERROR("close");
2209 }
2210 goto error;
2211 }
2212
2213 /*
2214 * Using message-based transmissions to ensure we don't
2215 * have to deal with partially received messages.
2216 */
2217 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
2218 if (ret < 0) {
2219 ERR("Exhausted file descriptors allowed for applications.");
2220 free(ust_cmd);
2221 ret = close(sock);
2222 if (ret) {
2223 PERROR("close");
2224 }
2225 sock = -1;
2226 continue;
2227 }
2228
2229 health_code_update();
2230 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
2231 if (ret < 0) {
2232 free(ust_cmd);
2233 /* Close socket of the application. */
2234 ret = close(sock);
2235 if (ret) {
2236 PERROR("close");
2237 }
2238 lttng_fd_put(LTTNG_FD_APPS, 1);
2239 sock = -1;
2240 continue;
2241 }
2242 health_code_update();
2243
2244 ust_cmd->sock = sock;
2245 sock = -1;
2246
2247 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2248 " gid:%d sock:%d name:%s (version %d.%d)",
2249 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
2250 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
2251 ust_cmd->sock, ust_cmd->reg_msg.name,
2252 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
2253
2254 /*
2255 * Lock free enqueue the registration request. The red pill
2256 * has been taken! This apps will be part of the *system*.
2257 */
2258 cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node);
2259
2260 /*
2261 * Wake the registration queue futex. Implicit memory
2262 * barrier with the exchange in cds_wfcq_enqueue.
2263 */
2264 futex_nto1_wake(&ust_cmd_queue.futex);
2265 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
2266 ERR("Register apps socket poll error");
2267 goto error;
2268 } else {
2269 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
2270 goto error;
2271 }
2272 }
2273 }
2274 }
2275
2276 exit:
2277 error:
2278 /* Notify that the registration thread is gone */
2279 notify_ust_apps(0);
2280
2281 if (apps_sock >= 0) {
2282 ret = close(apps_sock);
2283 if (ret) {
2284 PERROR("close");
2285 }
2286 }
2287 if (sock >= 0) {
2288 ret = close(sock);
2289 if (ret) {
2290 PERROR("close");
2291 }
2292 lttng_fd_put(LTTNG_FD_APPS, 1);
2293 }
2294 unlink(config.apps_unix_sock_path.value);
2295
2296 error_poll_add:
2297 lttng_poll_clean(&events);
2298 error_listen:
2299 error_create_poll:
2300 error_testpoint:
2301 DBG("UST Registration thread cleanup complete");
2302 if (err) {
2303 health_error();
2304 ERR("Health error occurred in %s", __func__);
2305 }
2306 health_unregister(health_sessiond);
2307
2308 return NULL;
2309 }
2310
2311 /*
2312 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2313 * exec or it will fails.
2314 */
2315 static int spawn_consumer_thread(struct consumer_data *consumer_data)
2316 {
2317 int ret, clock_ret;
2318 struct timespec timeout;
2319
2320 /*
2321 * Make sure we set the readiness flag to 0 because we are NOT ready.
2322 * This access to consumer_thread_is_ready does not need to be
2323 * protected by consumer_data.cond_mutex (yet) since the consumer
2324 * management thread has not been started at this point.
2325 */
2326 consumer_data->consumer_thread_is_ready = 0;
2327
2328 /* Setup pthread condition */
2329 ret = pthread_condattr_init(&consumer_data->condattr);
2330 if (ret) {
2331 errno = ret;
2332 PERROR("pthread_condattr_init consumer data");
2333 goto error;
2334 }
2335
2336 /*
2337 * Set the monotonic clock in order to make sure we DO NOT jump in time
2338 * between the clock_gettime() call and the timedwait call. See bug #324
2339 * for a more details and how we noticed it.
2340 */
2341 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
2342 if (ret) {
2343 errno = ret;
2344 PERROR("pthread_condattr_setclock consumer data");
2345 goto error;
2346 }
2347
2348 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
2349 if (ret) {
2350 errno = ret;
2351 PERROR("pthread_cond_init consumer data");
2352 goto error;
2353 }
2354
2355 ret = pthread_create(&consumer_data->thread, default_pthread_attr(),
2356 thread_manage_consumer, consumer_data);
2357 if (ret) {
2358 errno = ret;
2359 PERROR("pthread_create consumer");
2360 ret = -1;
2361 goto error;
2362 }
2363
2364 /* We are about to wait on a pthread condition */
2365 pthread_mutex_lock(&consumer_data->cond_mutex);
2366
2367 /* Get time for sem_timedwait absolute timeout */
2368 clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout);
2369 /*
2370 * Set the timeout for the condition timed wait even if the clock gettime
2371 * call fails since we might loop on that call and we want to avoid to
2372 * increment the timeout too many times.
2373 */
2374 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
2375
2376 /*
2377 * The following loop COULD be skipped in some conditions so this is why we
2378 * set ret to 0 in order to make sure at least one round of the loop is
2379 * done.
2380 */
2381 ret = 0;
2382
2383 /*
2384 * Loop until the condition is reached or when a timeout is reached. Note
2385 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2386 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2387 * possible. This loop does not take any chances and works with both of
2388 * them.
2389 */
2390 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
2391 if (clock_ret < 0) {
2392 PERROR("clock_gettime spawn consumer");
2393 /* Infinite wait for the consumerd thread to be ready */
2394 ret = pthread_cond_wait(&consumer_data->cond,
2395 &consumer_data->cond_mutex);
2396 } else {
2397 ret = pthread_cond_timedwait(&consumer_data->cond,
2398 &consumer_data->cond_mutex, &timeout);
2399 }
2400 }
2401
2402 /* Release the pthread condition */
2403 pthread_mutex_unlock(&consumer_data->cond_mutex);
2404
2405 if (ret != 0) {
2406 errno = ret;
2407 if (ret == ETIMEDOUT) {
2408 int pth_ret;
2409
2410 /*
2411 * Call has timed out so we kill the kconsumerd_thread and return
2412 * an error.
2413 */
2414 ERR("Condition timed out. The consumer thread was never ready."
2415 " Killing it");
2416 pth_ret = pthread_cancel(consumer_data->thread);
2417 if (pth_ret < 0) {
2418 PERROR("pthread_cancel consumer thread");
2419 }
2420 } else {
2421 PERROR("pthread_cond_wait failed consumer thread");
2422 }
2423 /* Caller is expecting a negative value on failure. */
2424 ret = -1;
2425 goto error;
2426 }
2427
2428 pthread_mutex_lock(&consumer_data->pid_mutex);
2429 if (consumer_data->pid == 0) {
2430 ERR("Consumerd did not start");
2431 pthread_mutex_unlock(&consumer_data->pid_mutex);
2432 goto error;
2433 }
2434 pthread_mutex_unlock(&consumer_data->pid_mutex);
2435
2436 return 0;
2437
2438 error:
2439 return ret;
2440 }
2441
2442 /*
2443 * Join consumer thread
2444 */
2445 static int join_consumer_thread(struct consumer_data *consumer_data)
2446 {
2447 void *status;
2448
2449 /* Consumer pid must be a real one. */
2450 if (consumer_data->pid > 0) {
2451 int ret;
2452 ret = kill(consumer_data->pid, SIGTERM);
2453 if (ret) {
2454 PERROR("Error killing consumer daemon");
2455 return ret;
2456 }
2457 return pthread_join(consumer_data->thread, &status);
2458 } else {
2459 return 0;
2460 }
2461 }
2462
2463 /*
2464 * Fork and exec a consumer daemon (consumerd).
2465 *
2466 * Return pid if successful else -1.
2467 */
2468 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
2469 {
2470 int ret;
2471 pid_t pid;
2472 const char *consumer_to_use;
2473 const char *verbosity;
2474 struct stat st;
2475
2476 DBG("Spawning consumerd");
2477
2478 pid = fork();
2479 if (pid == 0) {
2480 /*
2481 * Exec consumerd.
2482 */
2483 if (config.verbose_consumer) {
2484 verbosity = "--verbose";
2485 } else if (lttng_opt_quiet) {
2486 verbosity = "--quiet";
2487 } else {
2488 verbosity = "";
2489 }
2490
2491 switch (consumer_data->type) {
2492 case LTTNG_CONSUMER_KERNEL:
2493 /*
2494 * Find out which consumerd to execute. We will first try the
2495 * 64-bit path, then the sessiond's installation directory, and
2496 * fallback on the 32-bit one,
2497 */
2498 DBG3("Looking for a kernel consumer at these locations:");
2499 DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL");
2500 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE);
2501 DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL");
2502 if (stat(config.consumerd64_bin_path.value, &st) == 0) {
2503 DBG3("Found location #1");
2504 consumer_to_use = config.consumerd64_bin_path.value;
2505 } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) {
2506 DBG3("Found location #2");
2507 consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE;
2508 } else if (stat(config.consumerd32_bin_path.value, &st) == 0) {
2509 DBG3("Found location #3");
2510 consumer_to_use = config.consumerd32_bin_path.value;
2511 } else {
2512 DBG("Could not find any valid consumerd executable");
2513 ret = -EINVAL;
2514 goto error;
2515 }
2516 DBG("Using kernel consumer at: %s", consumer_to_use);
2517 (void) execl(consumer_to_use,
2518 "lttng-consumerd", verbosity, "-k",
2519 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2520 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2521 "--group", config.tracing_group_name.value,
2522 NULL);
2523 break;
2524 case LTTNG_CONSUMER64_UST:
2525 {
2526 if (config.consumerd64_lib_dir.value) {
2527 char *tmp;
2528 size_t tmplen;
2529 char *tmpnew;
2530
2531 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
2532 if (!tmp) {
2533 tmp = "";
2534 }
2535 tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp);
2536 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2537 if (!tmpnew) {
2538 ret = -ENOMEM;
2539 goto error;
2540 }
2541 strcat(tmpnew, config.consumerd64_lib_dir.value);
2542 if (tmp[0] != '\0') {
2543 strcat(tmpnew, ":");
2544 strcat(tmpnew, tmp);
2545 }
2546 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
2547 free(tmpnew);
2548 if (ret) {
2549 ret = -errno;
2550 goto error;
2551 }
2552 }
2553 DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value);
2554 (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u",
2555 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2556 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2557 "--group", config.tracing_group_name.value,
2558 NULL);
2559 break;
2560 }
2561 case LTTNG_CONSUMER32_UST:
2562 {
2563 if (config.consumerd32_lib_dir.value) {
2564 char *tmp;
2565 size_t tmplen;
2566 char *tmpnew;
2567
2568 tmp = lttng_secure_getenv("LD_LIBRARY_PATH");
2569 if (!tmp) {
2570 tmp = "";
2571 }
2572 tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp);
2573 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2574 if (!tmpnew) {
2575 ret = -ENOMEM;
2576 goto error;
2577 }
2578 strcat(tmpnew, config.consumerd32_lib_dir.value);
2579 if (tmp[0] != '\0') {
2580 strcat(tmpnew, ":");
2581 strcat(tmpnew, tmp);
2582 }
2583 ret = setenv("LD_LIBRARY_PATH", tmpnew, 1);
2584 free(tmpnew);
2585 if (ret) {
2586 ret = -errno;
2587 goto error;
2588 }
2589 }
2590 DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value);
2591 (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u",
2592 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2593 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2594 "--group", config.tracing_group_name.value,
2595 NULL);
2596 break;
2597 }
2598 default:
2599 ERR("unknown consumer type");
2600 errno = 0;
2601 }
2602 if (errno != 0) {
2603 PERROR("Consumer execl()");
2604 }
2605 /* Reaching this point, we got a failure on our execl(). */
2606 exit(EXIT_FAILURE);
2607 } else if (pid > 0) {
2608 ret = pid;
2609 } else {
2610 PERROR("start consumer fork");
2611 ret = -errno;
2612 }
2613 error:
2614 return ret;
2615 }
2616
2617 /*
2618 * Spawn the consumerd daemon and session daemon thread.
2619 */
2620 static int start_consumerd(struct consumer_data *consumer_data)
2621 {
2622 int ret;
2623
2624 /*
2625 * Set the listen() state on the socket since there is a possible race
2626 * between the exec() of the consumer daemon and this call if place in the
2627 * consumer thread. See bug #366 for more details.
2628 */
2629 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2630 if (ret < 0) {
2631 goto error;
2632 }
2633
2634 pthread_mutex_lock(&consumer_data->pid_mutex);
2635 if (consumer_data->pid != 0) {
2636 pthread_mutex_unlock(&consumer_data->pid_mutex);
2637 goto end;
2638 }
2639
2640 ret = spawn_consumerd(consumer_data);
2641 if (ret < 0) {
2642 ERR("Spawning consumerd failed");
2643 pthread_mutex_unlock(&consumer_data->pid_mutex);
2644 goto error;
2645 }
2646
2647 /* Setting up the consumer_data pid */
2648 consumer_data->pid = ret;
2649 DBG2("Consumer pid %d", consumer_data->pid);
2650 pthread_mutex_unlock(&consumer_data->pid_mutex);
2651
2652 DBG2("Spawning consumer control thread");
2653 ret = spawn_consumer_thread(consumer_data);
2654 if (ret < 0) {
2655 ERR("Fatal error spawning consumer control thread");
2656 goto error;
2657 }
2658
2659 end:
2660 return 0;
2661
2662 error:
2663 /* Cleanup already created sockets on error. */
2664 if (consumer_data->err_sock >= 0) {
2665 int err;
2666
2667 err = close(consumer_data->err_sock);
2668 if (err < 0) {
2669 PERROR("close consumer data error socket");
2670 }
2671 }
2672 return ret;
2673 }
2674
2675 /*
2676 * Setup necessary data for kernel tracer action.
2677 */
2678 static int init_kernel_tracer(void)
2679 {
2680 int ret;
2681
2682 /* Modprobe lttng kernel modules */
2683 ret = modprobe_lttng_control();
2684 if (ret < 0) {
2685 goto error;
2686 }
2687
2688 /* Open debugfs lttng */
2689 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2690 if (kernel_tracer_fd < 0) {
2691 DBG("Failed to open %s", module_proc_lttng);
2692 goto error_open;
2693 }
2694
2695 /* Validate kernel version */
2696 ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version,
2697 &kernel_tracer_abi_version);
2698 if (ret < 0) {
2699 goto error_version;
2700 }
2701
2702 ret = modprobe_lttng_data();
2703 if (ret < 0) {
2704 goto error_modules;
2705 }
2706
2707 ret = kernel_supports_ring_buffer_snapshot_sample_positions(
2708 kernel_tracer_fd);
2709 if (ret < 0) {
2710 goto error_modules;
2711 }
2712
2713 if (ret < 1) {
2714 WARN("Kernel tracer does not support buffer monitoring. "
2715 "The monitoring timer of channels in the kernel domain "
2716 "will be set to 0 (disabled).");
2717 }
2718
2719 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2720 return 0;
2721
2722 error_version:
2723 modprobe_remove_lttng_control();
2724 ret = close(kernel_tracer_fd);
2725 if (ret) {
2726 PERROR("close");
2727 }
2728 kernel_tracer_fd = -1;
2729 return LTTNG_ERR_KERN_VERSION;
2730
2731 error_modules:
2732 ret = close(kernel_tracer_fd);
2733 if (ret) {
2734 PERROR("close");
2735 }
2736
2737 error_open:
2738 modprobe_remove_lttng_control();
2739
2740 error:
2741 WARN("No kernel tracer available");
2742 kernel_tracer_fd = -1;
2743 if (!is_root) {
2744 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2745 } else {
2746 return LTTNG_ERR_KERN_NA;
2747 }
2748 }
2749
2750
2751 /*
2752 * Copy consumer output from the tracing session to the domain session. The
2753 * function also applies the right modification on a per domain basis for the
2754 * trace files destination directory.
2755 *
2756 * Should *NOT* be called with RCU read-side lock held.
2757 */
2758 static int copy_session_consumer(int domain, struct ltt_session *session)
2759 {
2760 int ret;
2761 const char *dir_name;
2762 struct consumer_output *consumer;
2763
2764 assert(session);
2765 assert(session->consumer);
2766
2767 switch (domain) {
2768 case LTTNG_DOMAIN_KERNEL:
2769 DBG3("Copying tracing session consumer output in kernel session");
2770 /*
2771 * XXX: We should audit the session creation and what this function
2772 * does "extra" in order to avoid a destroy since this function is used
2773 * in the domain session creation (kernel and ust) only. Same for UST
2774 * domain.
2775 */
2776 if (session->kernel_session->consumer) {
2777 consumer_output_put(session->kernel_session->consumer);
2778 }
2779 session->kernel_session->consumer =
2780 consumer_copy_output(session->consumer);
2781 /* Ease our life a bit for the next part */
2782 consumer = session->kernel_session->consumer;
2783 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2784 break;
2785 case LTTNG_DOMAIN_JUL:
2786 case LTTNG_DOMAIN_LOG4J:
2787 case LTTNG_DOMAIN_PYTHON:
2788 case LTTNG_DOMAIN_UST:
2789 DBG3("Copying tracing session consumer output in UST session");
2790 if (session->ust_session->consumer) {
2791 consumer_output_put(session->ust_session->consumer);
2792 }
2793 session->ust_session->consumer =
2794 consumer_copy_output(session->consumer);
2795 /* Ease our life a bit for the next part */
2796 consumer = session->ust_session->consumer;
2797 dir_name = DEFAULT_UST_TRACE_DIR;
2798 break;
2799 default:
2800 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2801 goto error;
2802 }
2803
2804 /* Append correct directory to subdir */
2805 strncat(consumer->subdir, dir_name,
2806 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2807 DBG3("Copy session consumer subdir %s", consumer->subdir);
2808
2809 ret = LTTNG_OK;
2810
2811 error:
2812 return ret;
2813 }
2814
2815 /*
2816 * Create an UST session and add it to the session ust list.
2817 *
2818 * Should *NOT* be called with RCU read-side lock held.
2819 */
2820 static int create_ust_session(struct ltt_session *session,
2821 struct lttng_domain *domain)
2822 {
2823 int ret;
2824 struct ltt_ust_session *lus = NULL;
2825
2826 assert(session);
2827 assert(domain);
2828 assert(session->consumer);
2829
2830 switch (domain->type) {
2831 case LTTNG_DOMAIN_JUL:
2832 case LTTNG_DOMAIN_LOG4J:
2833 case LTTNG_DOMAIN_PYTHON:
2834 case LTTNG_DOMAIN_UST:
2835 break;
2836 default:
2837 ERR("Unknown UST domain on create session %d", domain->type);
2838 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2839 goto error;
2840 }
2841
2842 DBG("Creating UST session");
2843
2844 lus = trace_ust_create_session(session->id);
2845 if (lus == NULL) {
2846 ret = LTTNG_ERR_UST_SESS_FAIL;
2847 goto error;
2848 }
2849
2850 lus->uid = session->uid;
2851 lus->gid = session->gid;
2852 lus->output_traces = session->output_traces;
2853 lus->snapshot_mode = session->snapshot_mode;
2854 lus->live_timer_interval = session->live_timer;
2855 session->ust_session = lus;
2856 if (session->shm_path[0]) {
2857 strncpy(lus->root_shm_path, session->shm_path,
2858 sizeof(lus->root_shm_path));
2859 lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0';
2860 strncpy(lus->shm_path, session->shm_path,
2861 sizeof(lus->shm_path));
2862 lus->shm_path[sizeof(lus->shm_path) - 1] = '\0';
2863 strncat(lus->shm_path, "/ust",
2864 sizeof(lus->shm_path) - strlen(lus->shm_path) - 1);
2865 }
2866 /* Copy session output to the newly created UST session */
2867 ret = copy_session_consumer(domain->type, session);
2868 if (ret != LTTNG_OK) {
2869 goto error;
2870 }
2871
2872 return LTTNG_OK;
2873
2874 error:
2875 free(lus);
2876 session->ust_session = NULL;
2877 return ret;
2878 }
2879
2880 /*
2881 * Create a kernel tracer session then create the default channel.
2882 */
2883 static int create_kernel_session(struct ltt_session *session)
2884 {
2885 int ret;
2886
2887 DBG("Creating kernel session");
2888
2889 ret = kernel_create_session(session, kernel_tracer_fd);
2890 if (ret < 0) {
2891 ret = LTTNG_ERR_KERN_SESS_FAIL;
2892 goto error;
2893 }
2894
2895 /* Code flow safety */
2896 assert(session->kernel_session);
2897
2898 /* Copy session output to the newly created Kernel session */
2899 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2900 if (ret != LTTNG_OK) {
2901 goto error;
2902 }
2903
2904 session->kernel_session->uid = session->uid;
2905 session->kernel_session->gid = session->gid;
2906 session->kernel_session->output_traces = session->output_traces;
2907 session->kernel_session->snapshot_mode = session->snapshot_mode;
2908
2909 return LTTNG_OK;
2910
2911 error:
2912 trace_kernel_destroy_session(session->kernel_session);
2913 session->kernel_session = NULL;
2914 return ret;
2915 }
2916
2917 /*
2918 * Count number of session permitted by uid/gid.
2919 */
2920 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2921 {
2922 unsigned int i = 0;
2923 struct ltt_session *session;
2924
2925 DBG("Counting number of available session for UID %d GID %d",
2926 uid, gid);
2927 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2928 /*
2929 * Only list the sessions the user can control.
2930 */
2931 if (!session_access_ok(session, uid, gid)) {
2932 continue;
2933 }
2934 i++;
2935 }
2936 return i;
2937 }
2938
2939 /*
2940 * Check if the current kernel tracer supports the session rotation feature.
2941 * Return 1 if it does, 0 otherwise.
2942 */
2943 static int check_rotate_compatible(void)
2944 {
2945 int ret = 1;
2946
2947 if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) {
2948 DBG("Kernel tracer version is not compatible with the rotation feature");
2949 ret = 0;
2950 }
2951
2952 return ret;
2953 }
2954
2955 /*
2956 * Process the command requested by the lttng client within the command
2957 * context structure. This function make sure that the return structure (llm)
2958 * is set and ready for transmission before returning.
2959 *
2960 * Return any error encountered or 0 for success.
2961 *
2962 * "sock" is only used for special-case var. len data.
2963 *
2964 * Should *NOT* be called with RCU read-side lock held.
2965 */
2966 static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2967 int *sock_error)
2968 {
2969 int ret = LTTNG_OK;
2970 int need_tracing_session = 1;
2971 int need_domain;
2972
2973 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2974
2975 assert(!rcu_read_ongoing());
2976
2977 *sock_error = 0;
2978
2979 switch (cmd_ctx->lsm->cmd_type) {
2980 case LTTNG_CREATE_SESSION:
2981 case LTTNG_CREATE_SESSION_SNAPSHOT:
2982 case LTTNG_CREATE_SESSION_LIVE:
2983 case LTTNG_DESTROY_SESSION:
2984 case LTTNG_LIST_SESSIONS:
2985 case LTTNG_LIST_DOMAINS:
2986 case LTTNG_START_TRACE:
2987 case LTTNG_STOP_TRACE:
2988 case LTTNG_DATA_PENDING:
2989 case LTTNG_SNAPSHOT_ADD_OUTPUT:
2990 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2991 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2992 case LTTNG_SNAPSHOT_RECORD:
2993 case LTTNG_SAVE_SESSION:
2994 case LTTNG_SET_SESSION_SHM_PATH:
2995 case LTTNG_REGENERATE_METADATA:
2996 case LTTNG_REGENERATE_STATEDUMP:
2997 case LTTNG_REGISTER_TRIGGER:
2998 case LTTNG_UNREGISTER_TRIGGER:
2999 case LTTNG_ROTATE_SESSION:
3000 case LTTNG_ROTATION_GET_INFO:
3001 case LTTNG_SESSION_GET_CURRENT_OUTPUT:
3002 case LTTNG_ROTATION_SET_SCHEDULE:
3003 case LTTNG_ROTATION_SCHEDULE_GET_TIMER_PERIOD:
3004 case LTTNG_ROTATION_SCHEDULE_GET_SIZE:
3005 need_domain = 0;
3006 break;
3007 default:
3008 need_domain = 1;
3009 }
3010
3011 if (config.no_kernel && need_domain
3012 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3013 if (!is_root) {
3014 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
3015 } else {
3016 ret = LTTNG_ERR_KERN_NA;
3017 }
3018 goto error;
3019 }
3020
3021 /* Deny register consumer if we already have a spawned consumer. */
3022 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
3023 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3024 if (kconsumer_data.pid > 0) {
3025 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
3026 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3027 goto error;
3028 }
3029 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3030 }
3031
3032 /*
3033 * Check for command that don't needs to allocate a returned payload. We do
3034 * this here so we don't have to make the call for no payload at each
3035 * command.
3036 */
3037 switch(cmd_ctx->lsm->cmd_type) {
3038 case LTTNG_LIST_SESSIONS:
3039 case LTTNG_LIST_TRACEPOINTS:
3040 case LTTNG_LIST_TRACEPOINT_FIELDS:
3041 case LTTNG_LIST_DOMAINS:
3042 case LTTNG_LIST_CHANNELS:
3043 case LTTNG_LIST_EVENTS:
3044 case LTTNG_LIST_SYSCALLS:
3045 case LTTNG_LIST_TRACKER_PIDS:
3046 case LTTNG_DATA_PENDING:
3047 case LTTNG_ROTATE_SESSION:
3048 case LTTNG_ROTATION_GET_INFO:
3049 case LTTNG_ROTATION_SCHEDULE_GET_TIMER_PERIOD:
3050 case LTTNG_ROTATION_SCHEDULE_GET_SIZE:
3051 break;
3052 default:
3053 /* Setup lttng message with no payload */
3054 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0);
3055 if (ret < 0) {
3056 /* This label does not try to unlock the session */
3057 goto init_setup_error;
3058 }
3059 }
3060
3061 /* Commands that DO NOT need a session. */
3062 switch (cmd_ctx->lsm->cmd_type) {
3063 case LTTNG_CREATE_SESSION:
3064 case LTTNG_CREATE_SESSION_SNAPSHOT:
3065 case LTTNG_CREATE_SESSION_LIVE:
3066 case LTTNG_LIST_SESSIONS:
3067 case LTTNG_LIST_TRACEPOINTS:
3068 case LTTNG_LIST_SYSCALLS:
3069 case LTTNG_LIST_TRACEPOINT_FIELDS:
3070 case LTTNG_SAVE_SESSION:
3071 case LTTNG_REGISTER_TRIGGER:
3072 case LTTNG_UNREGISTER_TRIGGER:
3073 need_tracing_session = 0;
3074 break;
3075 default:
3076 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3077 /*
3078 * We keep the session list lock across _all_ commands
3079 * for now, because the per-session lock does not
3080 * handle teardown properly.
3081 */
3082 session_lock_list();
3083 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3084 if (cmd_ctx->session == NULL) {
3085 ret = LTTNG_ERR_SESS_NOT_FOUND;
3086 goto error;
3087 } else {
3088 /* Acquire lock for the session */
3089 session_lock(cmd_ctx->session);
3090 }
3091 break;
3092 }
3093
3094 /*
3095 * Commands that need a valid session but should NOT create one if none
3096 * exists. Instead of creating one and destroying it when the command is
3097 * handled, process that right before so we save some round trip in useless
3098 * code path.
3099 */
3100 switch (cmd_ctx->lsm->cmd_type) {
3101 case LTTNG_DISABLE_CHANNEL:
3102 case LTTNG_DISABLE_EVENT:
3103 switch (cmd_ctx->lsm->domain.type) {
3104 case LTTNG_DOMAIN_KERNEL:
3105 if (!cmd_ctx->session->kernel_session) {
3106 ret = LTTNG_ERR_NO_CHANNEL;
3107 goto error;
3108 }
3109 break;
3110 case LTTNG_DOMAIN_JUL:
3111 case LTTNG_DOMAIN_LOG4J:
3112 case LTTNG_DOMAIN_PYTHON:
3113 case LTTNG_DOMAIN_UST:
3114 if (!cmd_ctx->session->ust_session) {
3115 ret = LTTNG_ERR_NO_CHANNEL;
3116 goto error;
3117 }
3118 break;
3119 default:
3120 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
3121 goto error;
3122 }
3123 default:
3124 break;
3125 }
3126
3127 if (!need_domain) {
3128 goto skip_domain;
3129 }
3130
3131 /*
3132 * Check domain type for specific "pre-action".
3133 */
3134 switch (cmd_ctx->lsm->domain.type) {
3135 case LTTNG_DOMAIN_KERNEL:
3136 if (!is_root) {
3137 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
3138 goto error;
3139 }
3140
3141 /* Kernel tracer check */
3142 if (kernel_tracer_fd == -1) {
3143 /* Basically, load kernel tracer modules */
3144 ret = init_kernel_tracer();
3145 if (ret != 0) {
3146 goto error;
3147 }
3148 }
3149
3150 /* Consumer is in an ERROR state. Report back to client */
3151 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
3152 ret = LTTNG_ERR_NO_KERNCONSUMERD;
3153 goto error;
3154 }
3155
3156 /* Need a session for kernel command */
3157 if (need_tracing_session) {
3158 if (cmd_ctx->session->kernel_session == NULL) {
3159 ret = create_kernel_session(cmd_ctx->session);
3160 if (ret < 0) {
3161 ret = LTTNG_ERR_KERN_SESS_FAIL;
3162 goto error;
3163 }
3164 }
3165
3166 /* Start the kernel consumer daemon */
3167 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3168 if (kconsumer_data.pid == 0 &&
3169 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3170 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3171 ret = start_consumerd(&kconsumer_data);
3172 if (ret < 0) {
3173 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
3174 goto error;
3175 }
3176 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3177 } else {
3178 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3179 }
3180
3181 /*
3182 * The consumer was just spawned so we need to add the socket to
3183 * the consumer output of the session if exist.
3184 */
3185 ret = consumer_create_socket(&kconsumer_data,
3186 cmd_ctx->session->kernel_session->consumer);
3187 if (ret < 0) {
3188 goto error;
3189 }
3190 }
3191
3192 break;
3193 case LTTNG_DOMAIN_JUL:
3194 case LTTNG_DOMAIN_LOG4J:
3195 case LTTNG_DOMAIN_PYTHON:
3196 case LTTNG_DOMAIN_UST:
3197 {
3198 if (!ust_app_supported()) {
3199 ret = LTTNG_ERR_NO_UST;
3200 goto error;
3201 }
3202 /* Consumer is in an ERROR state. Report back to client */
3203 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
3204 ret = LTTNG_ERR_NO_USTCONSUMERD;
3205 goto error;
3206 }
3207
3208 if (need_tracing_session) {
3209 /* Create UST session if none exist. */
3210 if (cmd_ctx->session->ust_session == NULL) {
3211 ret = create_ust_session(cmd_ctx->session,
3212 &cmd_ctx->lsm->domain);
3213 if (ret != LTTNG_OK) {
3214 goto error;
3215 }
3216 }
3217
3218 /* Start the UST consumer daemons */
3219 /* 64-bit */
3220 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3221 if (config.consumerd64_bin_path.value &&
3222 ustconsumer64_data.pid == 0 &&
3223 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3224 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3225 ret = start_consumerd(&ustconsumer64_data);
3226 if (ret < 0) {
3227 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
3228 uatomic_set(&ust_consumerd64_fd, -EINVAL);
3229 goto error;
3230 }
3231
3232 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
3233 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3234 } else {
3235 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3236 }
3237
3238 /*
3239 * Setup socket for consumer 64 bit. No need for atomic access
3240 * since it was set above and can ONLY be set in this thread.
3241 */
3242 ret = consumer_create_socket(&ustconsumer64_data,
3243 cmd_ctx->session->ust_session->consumer);
3244 if (ret < 0) {
3245 goto error;
3246 }
3247
3248 /* 32-bit */
3249 pthread_mutex_lock(&ustconsumer32_data.pid_mutex);
3250 if (config.consumerd32_bin_path.value &&
3251 ustconsumer32_data.pid == 0 &&
3252 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3253 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3254 ret = start_consumerd(&ustconsumer32_data);
3255 if (ret < 0) {
3256 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
3257 uatomic_set(&ust_consumerd32_fd, -EINVAL);
3258 goto error;
3259 }
3260
3261 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
3262 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3263 } else {
3264 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3265 }
3266
3267 /*
3268 * Setup socket for consumer 64 bit. No need for atomic access
3269 * since it was set above and can ONLY be set in this thread.
3270 */
3271 ret = consumer_create_socket(&ustconsumer32_data,
3272 cmd_ctx->session->ust_session->consumer);
3273 if (ret < 0) {
3274 goto error;
3275 }
3276 }
3277 break;
3278 }
3279 default:
3280 break;
3281 }
3282 skip_domain:
3283
3284 /* Validate consumer daemon state when start/stop trace command */
3285 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
3286 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
3287 switch (cmd_ctx->lsm->domain.type) {
3288 case LTTNG_DOMAIN_NONE:
3289 break;
3290 case LTTNG_DOMAIN_JUL:
3291 case LTTNG_DOMAIN_LOG4J:
3292 case LTTNG_DOMAIN_PYTHON:
3293 case LTTNG_DOMAIN_UST:
3294 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
3295 ret = LTTNG_ERR_NO_USTCONSUMERD;
3296 goto error;
3297 }
3298 break;
3299 case LTTNG_DOMAIN_KERNEL:
3300 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
3301 ret = LTTNG_ERR_NO_KERNCONSUMERD;
3302 goto error;
3303 }
3304 break;
3305 default:
3306 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
3307 goto error;
3308 }
3309 }
3310
3311 /*
3312 * Check that the UID or GID match that of the tracing session.
3313 * The root user can interact with all sessions.
3314 */
3315 if (need_tracing_session) {
3316 if (!session_access_ok(cmd_ctx->session,
3317 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3318 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
3319 ret = LTTNG_ERR_EPERM;
3320 goto error;
3321 }
3322 }
3323
3324 /*
3325 * Send relayd information to consumer as soon as we have a domain and a
3326 * session defined.
3327 */
3328 if (cmd_ctx->session && need_domain) {
3329 /*
3330 * Setup relayd if not done yet. If the relayd information was already
3331 * sent to the consumer, this call will gracefully return.
3332 */
3333 ret = cmd_setup_relayd(cmd_ctx->session);
3334 if (ret != LTTNG_OK) {
3335 goto error;
3336 }
3337 }
3338
3339 /* Process by command type */
3340 switch (cmd_ctx->lsm->cmd_type) {
3341 case LTTNG_ADD_CONTEXT:
3342 {
3343 /*
3344 * An LTTNG_ADD_CONTEXT command might have a supplementary
3345 * payload if the context being added is an application context.
3346 */
3347 if (cmd_ctx->lsm->u.context.ctx.ctx ==
3348 LTTNG_EVENT_CONTEXT_APP_CONTEXT) {
3349 char *provider_name = NULL, *context_name = NULL;
3350 size_t provider_name_len =
3351 cmd_ctx->lsm->u.context.provider_name_len;
3352 size_t context_name_len =
3353 cmd_ctx->lsm->u.context.context_name_len;
3354
3355 if (provider_name_len == 0 || context_name_len == 0) {
3356 /*
3357 * Application provider and context names MUST
3358 * be provided.
3359 */
3360 ret = -LTTNG_ERR_INVALID;
3361 goto error;
3362 }
3363
3364 provider_name = zmalloc(provider_name_len + 1);
3365 if (!provider_name) {
3366 ret = -LTTNG_ERR_NOMEM;
3367 goto error;
3368 }
3369 cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name =
3370 provider_name;
3371
3372 context_name = zmalloc(context_name_len + 1);
3373 if (!context_name) {
3374 ret = -LTTNG_ERR_NOMEM;
3375 goto error_add_context;
3376 }
3377 cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name =
3378 context_name;
3379
3380 ret = lttcomm_recv_unix_sock(sock, provider_name,
3381 provider_name_len);
3382 if (ret < 0) {
3383 goto error_add_context;
3384 }
3385
3386 ret = lttcomm_recv_unix_sock(sock, context_name,
3387 context_name_len);
3388 if (ret < 0) {
3389 goto error_add_context;
3390 }
3391 }
3392
3393 /*
3394 * cmd_add_context assumes ownership of the provider and context
3395 * names.
3396 */
3397 ret = cmd_add_context(cmd_ctx->session,
3398 cmd_ctx->lsm->domain.type,
3399 cmd_ctx->lsm->u.context.channel_name,
3400 &cmd_ctx->lsm->u.context.ctx,
3401 kernel_poll_pipe[1]);
3402
3403 cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL;
3404 cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL;
3405 error_add_context:
3406 free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name);
3407 free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name);
3408 if (ret < 0) {
3409 goto error;
3410 }
3411 break;
3412 }
3413 case LTTNG_DISABLE_CHANNEL:
3414 {
3415 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3416 cmd_ctx->lsm->u.disable.channel_name);
3417 break;
3418 }
3419 case LTTNG_DISABLE_EVENT:
3420 {
3421
3422 /*
3423 * FIXME: handle filter; for now we just receive the filter's
3424 * bytecode along with the filter expression which are sent by
3425 * liblttng-ctl and discard them.
3426 *
3427 * This fixes an issue where the client may block while sending
3428 * the filter payload and encounter an error because the session
3429 * daemon closes the socket without ever handling this data.
3430 */
3431 size_t count = cmd_ctx->lsm->u.disable.expression_len +
3432 cmd_ctx->lsm->u.disable.bytecode_len;
3433
3434 if (count) {
3435 char data[LTTNG_FILTER_MAX_LEN];
3436
3437 DBG("Discarding disable event command payload of size %zu", count);
3438 while (count) {
3439 ret = lttcomm_recv_unix_sock(sock, data,
3440 count > sizeof(data) ? sizeof(data) : count);
3441 if (ret < 0) {
3442 goto error;
3443 }
3444
3445 count -= (size_t) ret;
3446 }
3447 }
3448 /* FIXME: passing packed structure to non-packed pointer */
3449 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3450 cmd_ctx->lsm->u.disable.channel_name,
3451 &cmd_ctx->lsm->u.disable.event);
3452 break;
3453 }
3454 case LTTNG_ENABLE_CHANNEL:
3455 {
3456 cmd_ctx->lsm->u.channel.chan.attr.extended.ptr =
3457 (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended;
3458 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
3459 &cmd_ctx->lsm->u.channel.chan,
3460 kernel_poll_pipe[1]);
3461 break;
3462 }
3463 case LTTNG_TRACK_PID:
3464 {
3465 ret = cmd_track_pid(cmd_ctx->session,
3466 cmd_ctx->lsm->domain.type,
3467 cmd_ctx->lsm->u.pid_tracker.pid);
3468 break;
3469 }
3470 case LTTNG_UNTRACK_PID:
3471 {
3472 ret = cmd_untrack_pid(cmd_ctx->session,
3473 cmd_ctx->lsm->domain.type,
3474 cmd_ctx->lsm->u.pid_tracker.pid);
3475 break;
3476 }
3477 case LTTNG_ENABLE_EVENT:
3478 {
3479 struct lttng_event_exclusion *exclusion = NULL;
3480 struct lttng_filter_bytecode *bytecode = NULL;
3481 char *filter_expression = NULL;
3482
3483 /* Handle exclusion events and receive it from the client. */
3484 if (cmd_ctx->lsm->u.enable.exclusion_count > 0) {
3485 size_t count = cmd_ctx->lsm->u.enable.exclusion_count;
3486
3487 exclusion = zmalloc(sizeof(struct lttng_event_exclusion) +
3488 (count * LTTNG_SYMBOL_NAME_LEN));
3489 if (!exclusion) {
3490 ret = LTTNG_ERR_EXCLUSION_NOMEM;
3491 goto error;
3492 }
3493
3494 DBG("Receiving var len exclusion event list from client ...");
3495 exclusion->count = count;
3496 ret = lttcomm_recv_unix_sock(sock, exclusion->names,
3497 count * LTTNG_SYMBOL_NAME_LEN);
3498 if (ret <= 0) {
3499 DBG("Nothing recv() from client var len data... continuing");
3500 *sock_error = 1;
3501 free(exclusion);
3502 ret = LTTNG_ERR_EXCLUSION_INVAL;
3503 goto error;
3504 }
3505 }
3506
3507 /* Get filter expression from client. */
3508 if (cmd_ctx->lsm->u.enable.expression_len > 0) {
3509 size_t expression_len =
3510 cmd_ctx->lsm->u.enable.expression_len;
3511
3512 if (expression_len > LTTNG_FILTER_MAX_LEN) {
3513 ret = LTTNG_ERR_FILTER_INVAL;
3514 free(exclusion);
3515 goto error;
3516 }
3517
3518 filter_expression = zmalloc(expression_len);
3519 if (!filter_expression) {
3520 free(exclusion);
3521 ret = LTTNG_ERR_FILTER_NOMEM;
3522 goto error;
3523 }
3524
3525 /* Receive var. len. data */
3526 DBG("Receiving var len filter's expression from client ...");
3527 ret = lttcomm_recv_unix_sock(sock, filter_expression,
3528 expression_len);
3529 if (ret <= 0) {
3530 DBG("Nothing recv() from client car len data... continuing");
3531 *sock_error = 1;
3532 free(filter_expression);
3533 free(exclusion);
3534 ret = LTTNG_ERR_FILTER_INVAL;
3535 goto error;
3536 }
3537 }
3538
3539 /* Handle filter and get bytecode from client. */
3540 if (cmd_ctx->lsm->u.enable.bytecode_len > 0) {
3541 size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len;
3542
3543 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
3544 ret = LTTNG_ERR_FILTER_INVAL;
3545 free(filter_expression);
3546 free(exclusion);
3547 goto error;
3548 }
3549
3550 bytecode = zmalloc(bytecode_len);
3551 if (!bytecode) {
3552 free(filter_expression);
3553 free(exclusion);
3554 ret = LTTNG_ERR_FILTER_NOMEM;
3555 goto error;
3556 }
3557
3558 /* Receive var. len. data */
3559 DBG("Receiving var len filter's bytecode from client ...");
3560 ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
3561 if (ret <= 0) {
3562 DBG("Nothing recv() from client car len data... continuing");
3563 *sock_error = 1;
3564 free(filter_expression);
3565 free(bytecode);
3566 free(exclusion);
3567 ret = LTTNG_ERR_FILTER_INVAL;
3568 goto error;
3569 }
3570
3571 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
3572 free(filter_expression);
3573 free(bytecode);
3574 free(exclusion);
3575 ret = LTTNG_ERR_FILTER_INVAL;
3576 goto error;
3577 }
3578 }
3579
3580 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3581 cmd_ctx->lsm->u.enable.channel_name,
3582 &cmd_ctx->lsm->u.enable.event,
3583 filter_expression, bytecode, exclusion,
3584 kernel_poll_pipe[1]);
3585 break;
3586 }
3587 case LTTNG_LIST_TRACEPOINTS:
3588 {
3589 struct lttng_event *events;
3590 ssize_t nb_events;
3591
3592 session_lock_list();
3593 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3594 session_unlock_list();
3595 if (nb_events < 0) {
3596 /* Return value is a negative lttng_error_code. */
3597 ret = -nb_events;
3598 goto error;
3599 }
3600
3601 /*
3602 * Setup lttng message with payload size set to the event list size in
3603 * bytes and then copy list into the llm payload.
3604 */
3605 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events,
3606 sizeof(struct lttng_event) * nb_events);
3607 free(events);
3608
3609 if (ret < 0) {
3610 goto setup_error;
3611 }
3612
3613 ret = LTTNG_OK;
3614 break;
3615 }
3616 case LTTNG_LIST_TRACEPOINT_FIELDS:
3617 {
3618 struct lttng_event_field *fields;
3619 ssize_t nb_fields;
3620
3621 session_lock_list();
3622 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
3623 &fields);
3624 session_unlock_list();
3625 if (nb_fields < 0) {
3626 /* Return value is a negative lttng_error_code. */
3627 ret = -nb_fields;
3628 goto error;
3629 }
3630
3631 /*
3632 * Setup lttng message with payload size set to the event list size in
3633 * bytes and then copy list into the llm payload.
3634 */
3635 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields,
3636 sizeof(struct lttng_event_field) * nb_fields);
3637 free(fields);
3638
3639 if (ret < 0) {
3640 goto setup_error;
3641 }
3642
3643 ret = LTTNG_OK;
3644 break;
3645 }
3646 case LTTNG_LIST_SYSCALLS:
3647 {
3648 struct lttng_event *events;
3649 ssize_t nb_events;
3650
3651 nb_events = cmd_list_syscalls(&events);
3652 if (nb_events < 0) {
3653 /* Return value is a negative lttng_error_code. */
3654 ret = -nb_events;
3655 goto error;
3656 }
3657
3658 /*
3659 * Setup lttng message with payload size set to the event list size in
3660 * bytes and then copy list into the llm payload.
3661 */
3662 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events,
3663 sizeof(struct lttng_event) * nb_events);
3664 free(events);
3665
3666 if (ret < 0) {
3667 goto setup_error;
3668 }
3669
3670 ret = LTTNG_OK;
3671 break;
3672 }
3673 case LTTNG_LIST_TRACKER_PIDS:
3674 {
3675 int32_t *pids = NULL;
3676 ssize_t nr_pids;
3677
3678 nr_pids = cmd_list_tracker_pids(cmd_ctx->session,
3679 cmd_ctx->lsm->domain.type, &pids);
3680 if (nr_pids < 0) {
3681 /* Return value is a negative lttng_error_code. */
3682 ret = -nr_pids;
3683 goto error;
3684 }
3685
3686 /*
3687 * Setup lttng message with payload size set to the event list size in
3688 * bytes and then copy list into the llm payload.
3689 */
3690 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids,
3691 sizeof(int32_t) * nr_pids);
3692 free(pids);
3693
3694 if (ret < 0) {
3695 goto setup_error;
3696 }
3697
3698 ret = LTTNG_OK;
3699 break;
3700 }
3701 case LTTNG_SET_CONSUMER_URI:
3702 {
3703 size_t nb_uri, len;
3704 struct lttng_uri *uris;
3705
3706 nb_uri = cmd_ctx->lsm->u.uri.size;
3707 len = nb_uri * sizeof(struct lttng_uri);
3708
3709 if (nb_uri == 0) {
3710 ret = LTTNG_ERR_INVALID;
3711 goto error;
3712 }
3713
3714 uris = zmalloc(len);
3715 if (uris == NULL) {
3716 ret = LTTNG_ERR_FATAL;
3717 goto error;
3718 }
3719
3720 /* Receive variable len data */
3721 DBG("Receiving %zu URI(s) from client ...", nb_uri);
3722 ret = lttcomm_recv_unix_sock(sock, uris, len);
3723 if (ret <= 0) {
3724 DBG("No URIs received from client... continuing");
3725 *sock_error = 1;
3726 ret = LTTNG_ERR_SESSION_FAIL;
3727 free(uris);
3728 goto error;
3729 }
3730
3731 ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris);
3732 free(uris);
3733 if (ret != LTTNG_OK) {
3734 goto error;
3735 }
3736
3737
3738 break;
3739 }
3740 case LTTNG_START_TRACE:
3741 {
3742 /*
3743 * On the first start, if we have a kernel session and we have
3744 * enabled time or size-based rotations, we have to make sure
3745 * the kernel tracer supports it.
3746 */
3747 if (!cmd_ctx->session->has_been_started && \
3748 cmd_ctx->session->kernel_session && \
3749 (cmd_ctx->session->rotate_timer_period || \
3750 cmd_ctx->session->rotate_size) && \
3751 !check_rotate_compatible()) {
3752 DBG("Kernel tracer version is not compatible with the rotation feature");
3753 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
3754 goto error;
3755 }
3756 ret = cmd_start_trace(cmd_ctx->session);
3757 break;
3758 }
3759 case LTTNG_STOP_TRACE:
3760 {
3761 ret = cmd_stop_trace(cmd_ctx->session);
3762 break;
3763 }
3764 case LTTNG_CREATE_SESSION:
3765 {
3766 size_t nb_uri, len;
3767 struct lttng_uri *uris = NULL;
3768
3769 nb_uri = cmd_ctx->lsm->u.uri.size;
3770 len = nb_uri * sizeof(struct lttng_uri);
3771
3772 if (nb_uri > 0) {
3773 uris = zmalloc(len);
3774 if (uris == NULL) {
3775 ret = LTTNG_ERR_FATAL;
3776 goto error;
3777 }
3778
3779 /* Receive variable len data */
3780 DBG("Waiting for %zu URIs from client ...", nb_uri);
3781 ret = lttcomm_recv_unix_sock(sock, uris, len);
3782 if (ret <= 0) {
3783 DBG("No URIs received from client... continuing");
3784 *sock_error = 1;
3785 ret = LTTNG_ERR_SESSION_FAIL;
3786 free(uris);
3787 goto error;
3788 }
3789
3790 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3791 DBG("Creating session with ONE network URI is a bad call");
3792 ret = LTTNG_ERR_SESSION_FAIL;
3793 free(uris);
3794 goto error;
3795 }
3796 }
3797
3798 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
3799 &cmd_ctx->creds, 0);
3800
3801 free(uris);
3802
3803 break;
3804 }
3805 case LTTNG_DESTROY_SESSION:
3806 {
3807 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1],
3808 notification_thread_handle);
3809
3810 /* Set session to NULL so we do not unlock it after free. */
3811 cmd_ctx->session = NULL;
3812 break;
3813 }
3814 case LTTNG_LIST_DOMAINS:
3815 {
3816 ssize_t nb_dom;
3817 struct lttng_domain *domains = NULL;
3818
3819 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3820 if (nb_dom < 0) {
3821 /* Return value is a negative lttng_error_code. */
3822 ret = -nb_dom;
3823 goto error;
3824 }
3825
3826 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains,
3827 nb_dom * sizeof(struct lttng_domain));
3828 free(domains);
3829
3830 if (ret < 0) {
3831 goto setup_error;
3832 }
3833
3834 ret = LTTNG_OK;
3835 break;
3836 }
3837 case LTTNG_LIST_CHANNELS:
3838 {
3839 ssize_t payload_size;
3840 struct lttng_channel *channels = NULL;
3841
3842 payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type,
3843 cmd_ctx->session, &channels);
3844 if (payload_size < 0) {
3845 /* Return value is a negative lttng_error_code. */
3846 ret = -payload_size;
3847 goto error;
3848 }
3849
3850 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels,
3851 payload_size);
3852 free(channels);
3853
3854 if (ret < 0) {
3855 goto setup_error;
3856 }
3857
3858 ret = LTTNG_OK;
3859 break;
3860 }
3861 case LTTNG_LIST_EVENTS:
3862 {
3863 ssize_t nb_event;
3864 struct lttng_event *events = NULL;
3865 struct lttcomm_event_command_header cmd_header;
3866 size_t total_size;
3867
3868 memset(&cmd_header, 0, sizeof(cmd_header));
3869 /* Extended infos are included at the end of events */
3870 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type,
3871 cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name,
3872 &events, &total_size);
3873
3874 if (nb_event < 0) {
3875 /* Return value is a negative lttng_error_code. */
3876 ret = -nb_event;
3877 goto error;
3878 }
3879
3880 cmd_header.nb_events = nb_event;
3881 ret = setup_lttng_msg(cmd_ctx, events, total_size,
3882 &cmd_header, sizeof(cmd_header));
3883 free(events);
3884
3885 if (ret < 0) {
3886 goto setup_error;
3887 }
3888
3889 ret = LTTNG_OK;
3890 break;
3891 }
3892 case LTTNG_LIST_SESSIONS:
3893 {
3894 unsigned int nr_sessions;
3895 void *sessions_payload;
3896 size_t payload_len;
3897
3898 session_lock_list();
3899 nr_sessions = lttng_sessions_count(
3900 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3901 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3902 payload_len = sizeof(struct lttng_session) * nr_sessions;
3903 sessions_payload = zmalloc(payload_len);
3904
3905 if (!sessions_payload) {
3906 session_unlock_list();
3907 ret = -ENOMEM;
3908 goto setup_error;
3909 }
3910
3911 cmd_list_lttng_sessions(sessions_payload,
3912 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3913 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3914 session_unlock_list();
3915
3916 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload,
3917 payload_len);
3918 free(sessions_payload);
3919
3920 if (ret < 0) {
3921 goto setup_error;
3922 }
3923
3924 ret = LTTNG_OK;
3925 break;
3926 }
3927 case LTTNG_REGISTER_CONSUMER:
3928 {
3929 struct consumer_data *cdata;
3930
3931 switch (cmd_ctx->lsm->domain.type) {
3932 case LTTNG_DOMAIN_KERNEL:
3933 cdata = &kconsumer_data;
3934 break;
3935 default:
3936 ret = LTTNG_ERR_UND;
3937 goto error;
3938 }
3939
3940 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3941 cmd_ctx->lsm->u.reg.path, cdata);
3942 break;
3943 }
3944 case LTTNG_DATA_PENDING:
3945 {
3946 int pending_ret;
3947 uint8_t pending_ret_byte;
3948
3949 pending_ret = cmd_data_pending(cmd_ctx->session);
3950
3951 /*
3952 * FIXME
3953 *
3954 * This function may returns 0 or 1 to indicate whether or not
3955 * there is data pending. In case of error, it should return an
3956 * LTTNG_ERR code. However, some code paths may still return
3957 * a nondescript error code, which we handle by returning an
3958 * "unknown" error.
3959 */
3960 if (pending_ret == 0 || pending_ret == 1) {
3961 /*
3962 * ret will be set to LTTNG_OK at the end of
3963 * this function.
3964 */
3965 } else if (pending_ret < 0) {
3966 ret = LTTNG_ERR_UNK;
3967 goto setup_error;
3968 } else {
3969 ret = pending_ret;
3970 goto setup_error;
3971 }
3972
3973 pending_ret_byte = (uint8_t) pending_ret;
3974
3975 /* 1 byte to return whether or not data is pending */
3976 ret = setup_lttng_msg_no_cmd_header(cmd_ctx,
3977 &pending_ret_byte, 1);
3978
3979 if (ret < 0) {
3980 goto setup_error;
3981 }
3982
3983 ret = LTTNG_OK;
3984 break;
3985 }
3986 case LTTNG_SNAPSHOT_ADD_OUTPUT:
3987 {
3988 struct lttcomm_lttng_output_id reply;
3989
3990 ret = cmd_snapshot_add_output(cmd_ctx->session,
3991 &cmd_ctx->lsm->u.snapshot_output.output, &reply.id);
3992 if (ret != LTTNG_OK) {
3993 goto error;
3994 }
3995
3996 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply,
3997 sizeof(reply));
3998 if (ret < 0) {
3999 goto setup_error;
4000 }
4001
4002 /* Copy output list into message payload */
4003 ret = LTTNG_OK;
4004 break;
4005 }
4006 case LTTNG_SNAPSHOT_DEL_OUTPUT:
4007 {
4008 ret = cmd_snapshot_del_output(cmd_ctx->session,
4009 &cmd_ctx->lsm->u.snapshot_output.output);
4010 break;
4011 }
4012 case LTTNG_SNAPSHOT_LIST_OUTPUT:
4013 {
4014 ssize_t nb_output;
4015 struct lttng_snapshot_output *outputs = NULL;
4016
4017 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
4018 if (nb_output < 0) {
4019 ret = -nb_output;
4020 goto error;
4021 }
4022
4023 assert((nb_output > 0 && outputs) || nb_output == 0);
4024 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs,
4025 nb_output * sizeof(struct lttng_snapshot_output));
4026 free(outputs);
4027
4028 if (ret < 0) {
4029 goto setup_error;
4030 }
4031
4032 ret = LTTNG_OK;
4033 break;
4034 }
4035 case LTTNG_SNAPSHOT_RECORD:
4036 {
4037 ret = cmd_snapshot_record(cmd_ctx->session,
4038 &cmd_ctx->lsm->u.snapshot_record.output,
4039 cmd_ctx->lsm->u.snapshot_record.wait);
4040 break;
4041 }
4042 case LTTNG_CREATE_SESSION_SNAPSHOT:
4043 {
4044 size_t nb_uri, len;
4045 struct lttng_uri *uris = NULL;
4046
4047 nb_uri = cmd_ctx->lsm->u.uri.size;
4048 len = nb_uri * sizeof(struct lttng_uri);
4049
4050 if (nb_uri > 0) {
4051 uris = zmalloc(len);
4052 if (uris == NULL) {
4053 ret = LTTNG_ERR_FATAL;
4054 goto error;
4055 }
4056
4057 /* Receive variable len data */
4058 DBG("Waiting for %zu URIs from client ...", nb_uri);
4059 ret = lttcomm_recv_unix_sock(sock, uris, len);
4060 if (ret <= 0) {
4061 DBG("No URIs received from client... continuing");
4062 *sock_error = 1;
4063 ret = LTTNG_ERR_SESSION_FAIL;
4064 free(uris);
4065 goto error;
4066 }
4067
4068 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
4069 DBG("Creating session with ONE network URI is a bad call");
4070 ret = LTTNG_ERR_SESSION_FAIL;
4071 free(uris);
4072 goto error;
4073 }
4074 }
4075
4076 ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris,
4077 nb_uri, &cmd_ctx->creds);
4078 free(uris);
4079 break;
4080 }
4081 case LTTNG_CREATE_SESSION_LIVE:
4082 {
4083 size_t nb_uri, len;
4084 struct lttng_uri *uris = NULL;
4085
4086 nb_uri = cmd_ctx->lsm->u.uri.size;
4087 len = nb_uri * sizeof(struct lttng_uri);
4088
4089 if (nb_uri > 0) {
4090 uris = zmalloc(len);
4091 if (uris == NULL) {
4092 ret = LTTNG_ERR_FATAL;
4093 goto error;
4094 }
4095
4096 /* Receive variable len data */
4097 DBG("Waiting for %zu URIs from client ...", nb_uri);
4098 ret = lttcomm_recv_unix_sock(sock, uris, len);
4099 if (ret <= 0) {
4100 DBG("No URIs received from client... continuing");
4101 *sock_error = 1;
4102 ret = LTTNG_ERR_SESSION_FAIL;
4103 free(uris);
4104 goto error;
4105 }
4106
4107 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
4108 DBG("Creating session with ONE network URI is a bad call");
4109 ret = LTTNG_ERR_SESSION_FAIL;
4110 free(uris);
4111 goto error;
4112 }
4113 }
4114
4115 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris,
4116 nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval);
4117 free(uris);
4118 break;
4119 }
4120 case LTTNG_SAVE_SESSION:
4121 {
4122 ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr,
4123 &cmd_ctx->creds);
4124 break;
4125 }
4126 case LTTNG_SET_SESSION_SHM_PATH:
4127 {
4128 ret = cmd_set_session_shm_path(cmd_ctx->session,
4129 cmd_ctx->lsm->u.set_shm_path.shm_path);
4130 break;
4131 }
4132 case LTTNG_REGENERATE_METADATA:
4133 {
4134 ret = cmd_regenerate_metadata(cmd_ctx->session);
4135 break;
4136 }
4137 case LTTNG_REGENERATE_STATEDUMP:
4138 {
4139 ret = cmd_regenerate_statedump(cmd_ctx->session);
4140 break;
4141 }
4142 case LTTNG_REGISTER_TRIGGER:
4143 {
4144 ret = cmd_register_trigger(cmd_ctx, sock,
4145 notification_thread_handle);
4146 break;
4147 }
4148 case LTTNG_UNREGISTER_TRIGGER:
4149 {
4150 ret = cmd_unregister_trigger(cmd_ctx, sock,
4151 notification_thread_handle);
4152 break;
4153 }
4154 case LTTNG_ROTATE_SESSION:
4155 {
4156 struct lttng_rotate_session_return rotate_return;
4157
4158 DBG("Client rotate session \"%s\"", cmd_ctx->session->name);
4159
4160 memset(&rotate_return, 0, sizeof(rotate_return));
4161 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
4162 DBG("Kernel tracer version is not compatible with the rotation feature");
4163 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
4164 goto error;
4165 }
4166
4167 ret = cmd_rotate_session(cmd_ctx->session, &rotate_return);
4168 if (ret < 0) {
4169 ret = -ret;
4170 goto error;
4171 }
4172
4173 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return,
4174 sizeof(rotate_return));
4175 if (ret < 0) {
4176 ret = -ret;
4177 goto error;
4178 }
4179
4180 ret = LTTNG_OK;
4181 break;
4182 }
4183 case LTTNG_ROTATION_GET_INFO:
4184 {
4185 struct lttng_rotation_get_info_return get_info_return;
4186
4187 memset(&get_info_return, 0, sizeof(get_info_return));
4188 ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return,
4189 cmd_ctx->lsm->u.get_rotation_info.rotation_id);
4190 if (ret < 0) {
4191 ret = -ret;
4192 goto error;
4193 }
4194
4195 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return,
4196 sizeof(get_info_return));
4197 if (ret < 0) {
4198 ret = -ret;
4199 goto error;
4200 }
4201
4202 ret = LTTNG_OK;
4203 break;
4204 }
4205 case LTTNG_SESSION_GET_CURRENT_OUTPUT:
4206 {
4207 struct lttng_session_get_current_output_return output_return;
4208
4209 memset(&output_return, 0, sizeof(output_return));
4210 ret = cmd_session_get_current_output(cmd_ctx->session,
4211 &output_return);
4212 if (ret < 0) {
4213 ret = -ret;
4214 goto error;
4215 }
4216
4217 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &output_return,
4218 sizeof(output_return));
4219 if (ret < 0) {
4220 ret = -ret;
4221 goto error;
4222 }
4223
4224 ret = LTTNG_OK;
4225 break;
4226 }
4227 case LTTNG_ROTATION_SET_SCHEDULE:
4228 {
4229 if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) {
4230 DBG("Kernel tracer version does not support session rotations");
4231 ret = LTTNG_ERR_ROTATION_WRONG_VERSION;
4232 goto error;
4233 }
4234
4235 ret = cmd_rotation_set_schedule(cmd_ctx->session,
4236 cmd_ctx->lsm->u.rotate_setup.timer_us,
4237 cmd_ctx->lsm->u.rotate_setup.size,
4238 notification_thread_handle);
4239 if (ret != LTTNG_OK) {
4240 goto error;
4241 }
4242
4243 break;
4244 }
4245 case LTTNG_ROTATION_SCHEDULE_GET_TIMER_PERIOD:
4246 {
4247 struct lttng_rotation_schedule_get_timer_period *get_timer;
4248
4249 get_timer = zmalloc(sizeof(struct lttng_rotation_schedule_get_timer_period));
4250 if (!get_timer) {
4251 ret = ENOMEM;
4252 goto error;
4253 }
4254 get_timer->rotate_timer = cmd_ctx->session->rotate_timer_period;
4255
4256 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, get_timer,
4257 sizeof(struct lttng_rotation_schedule_get_timer_period));
4258 free(get_timer);
4259 if (ret < 0) {
4260 ret = -ret;
4261 goto error;
4262 }
4263
4264 ret = LTTNG_OK;
4265 break;
4266 }
4267 case LTTNG_ROTATION_SCHEDULE_GET_SIZE:
4268 {
4269 struct lttng_rotation_schedule_get_size *get_size;
4270
4271 get_size = zmalloc(sizeof(struct lttng_rotation_schedule_get_size));
4272 if (!get_size) {
4273 ret = ENOMEM;
4274 goto error;
4275 }
4276 get_size->rotate_size = cmd_ctx->session->rotate_size;
4277
4278 ret = setup_lttng_msg_no_cmd_header(cmd_ctx, get_size,
4279 sizeof(struct lttng_rotation_schedule_get_size));
4280 free(get_size);
4281 if (ret < 0) {
4282 ret = -ret;
4283 goto error;
4284 }
4285
4286 ret = LTTNG_OK;
4287 break;
4288 }
4289 default:
4290 ret = LTTNG_ERR_UND;
4291 break;
4292 }
4293
4294 error:
4295 if (cmd_ctx->llm == NULL) {
4296 DBG("Missing llm structure. Allocating one.");
4297 if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) {
4298 goto setup_error;
4299 }
4300 }
4301 /* Set return code */
4302 cmd_ctx->llm->ret_code = ret;
4303 setup_error:
4304 if (cmd_ctx->session) {
4305 session_unlock(cmd_ctx->session);
4306 }
4307 if (need_tracing_session) {
4308 session_unlock_list();
4309 }
4310 init_setup_error:
4311 assert(!rcu_read_ongoing());
4312 return ret;
4313 }
4314
4315 /*
4316 * Thread managing health check socket.
4317 */
4318 static void *thread_manage_health(void *data)
4319 {
4320 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
4321 uint32_t revents, nb_fd;
4322 struct lttng_poll_event events;
4323 struct health_comm_msg msg;
4324 struct health_comm_reply reply;
4325
4326 DBG("[thread] Manage health check started");
4327
4328 rcu_register_thread();
4329
4330 /* We might hit an error path before this is created. */
4331 lttng_poll_init(&events);
4332
4333 /* Create unix socket */
4334 sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value);
4335 if (sock < 0) {
4336 ERR("Unable to create health check Unix socket");
4337 goto error;
4338 }
4339
4340 if (is_root) {
4341 /* lttng health client socket path permissions */
4342 ret = chown(config.health_unix_sock_path.value, 0,
4343 utils_get_group_id(config.tracing_group_name.value));
4344 if (ret < 0) {
4345 ERR("Unable to set group on %s", config.health_unix_sock_path.value);
4346 PERROR("chown");
4347 goto error;
4348 }
4349
4350 ret = chmod(config.health_unix_sock_path.value,
4351 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4352 if (ret < 0) {
4353 ERR("Unable to set permissions on %s", config.health_unix_sock_path.value);
4354 PERROR("chmod");
4355 goto error;
4356 }
4357 }
4358
4359 /*
4360 * Set the CLOEXEC flag. Return code is useless because either way, the
4361 * show must go on.
4362 */
4363 (void) utils_set_fd_cloexec(sock);
4364
4365 ret = lttcomm_listen_unix_sock(sock);
4366 if (ret < 0) {
4367 goto error;
4368 }
4369
4370 /*
4371 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4372 * more will be added to this poll set.
4373 */
4374 ret = sessiond_set_thread_pollset(&events, 2);
4375 if (ret < 0) {
4376 goto error;
4377 }
4378
4379 /* Add the application registration socket */
4380 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
4381 if (ret < 0) {
4382 goto error;
4383 }
4384
4385 sessiond_notify_ready();
4386
4387 while (1) {
4388 DBG("Health check ready");
4389
4390 /* Inifinite blocking call, waiting for transmission */
4391 restart:
4392 ret = lttng_poll_wait(&events, -1);
4393 if (ret < 0) {
4394 /*
4395 * Restart interrupted system call.
4396 */
4397 if (errno == EINTR) {
4398 goto restart;
4399 }
4400 goto error;
4401 }
4402
4403 nb_fd = ret;
4404
4405 for (i = 0; i < nb_fd; i++) {
4406 /* Fetch once the poll data */
4407 revents = LTTNG_POLL_GETEV(&events, i);
4408 pollfd = LTTNG_POLL_GETFD(&events, i);
4409
4410 if (!revents) {
4411 /* No activity for this FD (poll implementation). */
4412 continue;
4413 }
4414
4415 /* Thread quit pipe has been closed. Killing thread. */
4416 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
4417 if (ret) {
4418 err = 0;
4419 goto exit;
4420 }
4421
4422 /* Event on the registration socket */
4423 if (pollfd == sock) {
4424 if (revents & LPOLLIN) {
4425 continue;
4426 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4427 ERR("Health socket poll error");
4428 goto error;
4429 } else {
4430 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
4431 goto error;
4432 }
4433 }
4434 }
4435
4436 new_sock = lttcomm_accept_unix_sock(sock);
4437 if (new_sock < 0) {
4438 goto error;
4439 }
4440
4441 /*
4442 * Set the CLOEXEC flag. Return code is useless because either way, the
4443 * show must go on.
4444 */
4445 (void) utils_set_fd_cloexec(new_sock);
4446
4447 DBG("Receiving data from client for health...");
4448 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
4449 if (ret <= 0) {
4450 DBG("Nothing recv() from client... continuing");
4451 ret = close(new_sock);
4452 if (ret) {
4453 PERROR("close");
4454 }
4455 continue;
4456 }
4457
4458 rcu_thread_online();
4459
4460 memset(&reply, 0, sizeof(reply));
4461 for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
4462 /*
4463 * health_check_state returns 0 if health is
4464 * bad.
4465 */
4466 if (!health_check_state(health_sessiond, i)) {
4467 reply.ret_code |= 1ULL << i;
4468 }
4469 }
4470
4471 DBG2("Health check return value %" PRIx64, reply.ret_code);
4472
4473 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
4474 if (ret < 0) {
4475 ERR("Failed to send health data back to client");
4476 }
4477
4478 /* End of transmission */
4479 ret = close(new_sock);
4480 if (ret) {
4481 PERROR("close");
4482 }
4483 }
4484
4485 exit:
4486 error:
4487 if (err) {
4488 ERR("Health error occurred in %s", __func__);
4489 }
4490 DBG("Health check thread dying");
4491 unlink(config.health_unix_sock_path.value);
4492 if (sock >= 0) {
4493 ret = close(sock);
4494 if (ret) {
4495 PERROR("close");
4496 }
4497 }
4498
4499 lttng_poll_clean(&events);
4500 stop_threads();
4501 rcu_unregister_thread();
4502 return NULL;
4503 }
4504
4505 /*
4506 * This thread manage all clients request using the unix client socket for
4507 * communication.
4508 */
4509 static void *thread_manage_clients(void *data)
4510 {
4511 int sock = -1, ret, i, pollfd, err = -1;
4512 int sock_error;
4513 uint32_t revents, nb_fd;
4514 struct command_ctx *cmd_ctx = NULL;
4515 struct lttng_poll_event events;
4516
4517 DBG("[thread] Manage client started");
4518
4519 rcu_register_thread();
4520
4521 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
4522
4523 health_code_update();
4524
4525 ret = lttcomm_listen_unix_sock(client_sock);
4526 if (ret < 0) {
4527 goto error_listen;
4528 }
4529
4530 /*
4531 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
4532 * more will be added to this poll set.
4533 */
4534 ret = sessiond_set_thread_pollset(&events, 2);
4535 if (ret < 0) {
4536 goto error_create_poll;
4537 }
4538
4539 /* Add the application registration socket */
4540 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
4541 if (ret < 0) {
4542 goto error;
4543 }
4544
4545 ret = sem_post(&load_info->message_thread_ready);
4546 if (ret) {
4547 PERROR("sem_post message_thread_ready");
4548 goto error;
4549 }
4550
4551 /*
4552 * Wait until all support threads are initialized before accepting
4553 * commands.
4554 */
4555 while (uatomic_read(&lttng_sessiond_ready) != 0) {
4556 fd_set read_fds;
4557 struct timeval timeout;
4558
4559 FD_ZERO(&read_fds);
4560 FD_SET(thread_quit_pipe[0], &read_fds);
4561 memset(&timeout, 0, sizeof(timeout));
4562 timeout.tv_usec = 1000;
4563
4564 /*
4565 * If a support thread failed to launch, it may signal that
4566 * we must exit and the sessiond would never be marked as
4567 * "ready".
4568 *
4569 * The timeout is set to 1ms, which serves as a way to
4570 * pace down this check.
4571 */
4572 ret = select(thread_quit_pipe[0] + 1, &read_fds, NULL, NULL,
4573 &timeout);
4574 if (ret > 0 || (ret < 0 && errno != EINTR)) {
4575 goto exit;
4576 }
4577 }
4578 /*
4579 * This barrier is paired with the one in sessiond_notify_ready() to
4580 * ensure that loads accessing data initialized by the other threads,
4581 * on which this thread was waiting, are not performed before this point.
4582 *
4583 * Note that this could be a 'read' memory barrier, but a full barrier
4584 * is used in case the code changes. The performance implications of
4585 * this choice are minimal since this is a slow path.
4586 */
4587 cmm_smp_mb();
4588
4589 /* This testpoint is after we signal readiness to the parent. */
4590 if (testpoint(sessiond_thread_manage_clients)) {
4591 goto error;
4592 }
4593
4594 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
4595 goto error;
4596 }
4597
4598 health_code_update();
4599
4600 while (1) {
4601 DBG("Accepting client command ...");
4602
4603 /* Inifinite blocking call, waiting for transmission */
4604 restart:
4605 health_poll_entry();
4606 ret = lttng_poll_wait(&events, -1);
4607 health_poll_exit();
4608 if (ret < 0) {
4609 /*
4610 * Restart interrupted system call.
4611 */
4612 if (errno == EINTR) {
4613 goto restart;
4614 }
4615 goto error;
4616 }
4617
4618 nb_fd = ret;
4619
4620 for (i = 0; i < nb_fd; i++) {
4621 /* Fetch once the poll data */
4622 revents = LTTNG_POLL_GETEV(&events, i);
4623 pollfd = LTTNG_POLL_GETFD(&events, i);
4624
4625 health_code_update();
4626
4627 if (!revents) {
4628 /* No activity for this FD (poll implementation). */
4629 continue;
4630 }
4631
4632 /* Thread quit pipe has been closed. Killing thread. */
4633 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
4634 if (ret) {
4635 err = 0;
4636 goto exit;
4637 }
4638
4639 /* Event on the registration socket */
4640 if (pollfd == client_sock) {
4641 if (revents & LPOLLIN) {
4642 continue;
4643 } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
4644 ERR("Client socket poll error");
4645 goto error;
4646 } else {
4647 ERR("Unexpected poll events %u for sock %d", revents, pollfd);
4648 goto error;
4649 }
4650 }
4651 }
4652
4653 DBG("Wait for client response");
4654
4655 health_code_update();
4656
4657 sock = lttcomm_accept_unix_sock(client_sock);
4658 if (sock < 0) {
4659 goto error;
4660 }
4661
4662 /*
4663 * Set the CLOEXEC flag. Return code is useless because either way, the
4664 * show must go on.
4665 */
4666 (void) utils_set_fd_cloexec(sock);
4667
4668 /* Set socket option for credentials retrieval */
4669 ret = lttcomm_setsockopt_creds_unix_sock(sock);
4670 if (ret < 0) {
4671 goto error;
4672 }
4673
4674 /* Allocate context command to process the client request */
4675 cmd_ctx = zmalloc(sizeof(struct command_ctx));
4676 if (cmd_ctx == NULL) {
4677 PERROR("zmalloc cmd_ctx");
4678 goto error;
4679 }
4680
4681 /* Allocate data buffer for reception */
4682 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
4683 if (cmd_ctx->lsm == NULL) {
4684 PERROR("zmalloc cmd_ctx->lsm");
4685 goto error;
4686 }
4687
4688 cmd_ctx->llm = NULL;
4689 cmd_ctx->session = NULL;
4690
4691 health_code_update();
4692
4693 /*
4694 * Data is received from the lttng client. The struct
4695 * lttcomm_session_msg (lsm) contains the command and data request of
4696 * the client.
4697 */
4698 DBG("Receiving data from client ...");
4699 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
4700 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
4701 if (ret <= 0) {
4702 DBG("Nothing recv() from client... continuing");
4703 ret = close(sock);
4704 if (ret) {
4705 PERROR("close");
4706 }
4707 sock = -1;
4708 clean_command_ctx(&cmd_ctx);
4709 continue;
4710 }
4711
4712 health_code_update();
4713
4714 // TODO: Validate cmd_ctx including sanity check for
4715 // security purpose.
4716
4717 rcu_thread_online();
4718 /*
4719 * This function dispatch the work to the kernel or userspace tracer
4720 * libs and fill the lttcomm_lttng_msg data structure of all the needed
4721 * informations for the client. The command context struct contains
4722 * everything this function may needs.
4723 */
4724 ret = process_client_msg(cmd_ctx, sock, &sock_error);
4725 rcu_thread_offline();
4726 if (ret < 0) {
4727 ret = close(sock);
4728 if (ret) {
4729 PERROR("close");
4730 }
4731 sock = -1;
4732 /*
4733 * TODO: Inform client somehow of the fatal error. At
4734 * this point, ret < 0 means that a zmalloc failed
4735 * (ENOMEM). Error detected but still accept
4736 * command, unless a socket error has been
4737 * detected.
4738 */
4739 clean_command_ctx(&cmd_ctx);
4740 continue;
4741 }
4742
4743 health_code_update();
4744
4745 DBG("Sending response (size: %d, retcode: %s (%d))",
4746 cmd_ctx->lttng_msg_size,
4747 lttng_strerror(-cmd_ctx->llm->ret_code),
4748 cmd_ctx->llm->ret_code);
4749 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
4750 if (ret < 0) {
4751 ERR("Failed to send data back to client");
4752 }
4753
4754 /* End of transmission */
4755 ret = close(sock);
4756 if (ret) {
4757 PERROR("close");
4758 }
4759 sock = -1;
4760
4761 clean_command_ctx(&cmd_ctx);
4762
4763 health_code_update();
4764 }
4765
4766 exit:
4767 error:
4768 if (sock >= 0) {
4769 ret = close(sock);
4770 if (ret) {
4771 PERROR("close");
4772 }
4773 }
4774
4775 lttng_poll_clean(&events);
4776 clean_command_ctx(&cmd_ctx);
4777
4778 error_listen:
4779 error_create_poll:
4780 unlink(config.client_unix_sock_path.value);
4781 if (client_sock >= 0) {
4782 ret = close(client_sock);
4783 if (ret) {
4784 PERROR("close");
4785 }
4786 }
4787
4788 if (err) {
4789 health_error();
4790 ERR("Health error occurred in %s", __func__);
4791 }
4792
4793 health_unregister(health_sessiond);
4794
4795 DBG("Client thread dying");
4796
4797 rcu_unregister_thread();
4798
4799 /*
4800 * Since we are creating the consumer threads, we own them, so we need
4801 * to join them before our thread exits.
4802 */
4803 ret = join_consumer_thread(&kconsumer_data);
4804 if (ret) {
4805 errno = ret;
4806 PERROR("join_consumer");
4807 }
4808
4809 ret = join_consumer_thread(&ustconsumer32_data);
4810 if (ret) {
4811 errno = ret;
4812 PERROR("join_consumer ust32");
4813 }
4814
4815 ret = join_consumer_thread(&ustconsumer64_data);
4816 if (ret) {
4817 errno = ret;
4818 PERROR("join_consumer ust64");
4819 }
4820 return NULL;
4821 }
4822
4823 static int string_match(const char *str1, const char *str2)
4824 {
4825 return (str1 && str2) && !strcmp(str1, str2);
4826 }
4827
4828 /*
4829 * Take an option from the getopt output and set it in the right variable to be
4830 * used later.
4831 *
4832 * Return 0 on success else a negative value.
4833 */
4834 static int set_option(int opt, const char *arg, const char *optname)
4835 {
4836 int ret = 0;
4837
4838 if (string_match(optname, "client-sock") || opt == 'c') {
4839 if (!arg || *arg == '\0') {
4840 ret = -EINVAL;
4841 goto end;
4842 }
4843 if (lttng_is_setuid_setgid()) {
4844 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4845 "-c, --client-sock");
4846 } else {
4847 config_string_set(&config.client_unix_sock_path,
4848 strdup(arg));
4849 if (!config.client_unix_sock_path.value) {
4850 ret = -ENOMEM;
4851 PERROR("strdup");
4852 }
4853 }
4854 } else if (string_match(optname, "apps-sock") || opt == 'a') {
4855 if (!arg || *arg == '\0') {
4856 ret = -EINVAL;
4857 goto end;
4858 }
4859 if (lttng_is_setuid_setgid()) {
4860 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4861 "-a, --apps-sock");
4862 } else {
4863 config_string_set(&config.apps_unix_sock_path,
4864 strdup(arg));
4865 if (!config.apps_unix_sock_path.value) {
4866 ret = -ENOMEM;
4867 PERROR("strdup");
4868 }
4869 }
4870 } else if (string_match(optname, "daemonize") || opt == 'd') {
4871 config.daemonize = true;
4872 } else if (string_match(optname, "background") || opt == 'b') {
4873 config.background = true;
4874 } else if (string_match(optname, "group") || opt == 'g') {
4875 if (!arg || *arg == '\0') {
4876 ret = -EINVAL;
4877 goto end;
4878 }
4879 if (lttng_is_setuid_setgid()) {
4880 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4881 "-g, --group");
4882 } else {
4883 config_string_set(&config.tracing_group_name,
4884 strdup(arg));
4885 if (!config.tracing_group_name.value) {
4886 ret = -ENOMEM;
4887 PERROR("strdup");
4888 }
4889 }
4890 } else if (string_match(optname, "help") || opt == 'h') {
4891 ret = utils_show_help(8, "lttng-sessiond", help_msg);
4892 if (ret) {
4893 ERR("Cannot show --help for `lttng-sessiond`");
4894 perror("exec");
4895 }
4896 exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
4897 } else if (string_match(optname, "version") || opt == 'V') {
4898 fprintf(stdout, "%s\n", VERSION);
4899 exit(EXIT_SUCCESS);
4900 } else if (string_match(optname, "sig-parent") || opt == 'S') {
4901 config.sig_parent = true;
4902 } else if (string_match(optname, "kconsumerd-err-sock")) {
4903 if (!arg || *arg == '\0') {
4904 ret = -EINVAL;
4905 goto end;
4906 }
4907 if (lttng_is_setuid_setgid()) {
4908 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4909 "--kconsumerd-err-sock");
4910 } else {
4911 config_string_set(&config.kconsumerd_err_unix_sock_path,
4912 strdup(arg));
4913 if (!config.kconsumerd_err_unix_sock_path.value) {
4914 ret = -ENOMEM;
4915 PERROR("strdup");
4916 }
4917 }
4918 } else if (string_match(optname, "kconsumerd-cmd-sock")) {
4919 if (!arg || *arg == '\0') {
4920 ret = -EINVAL;
4921 goto end;
4922 }
4923 if (lttng_is_setuid_setgid()) {
4924 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4925 "--kconsumerd-cmd-sock");
4926 } else {
4927 config_string_set(&config.kconsumerd_cmd_unix_sock_path,
4928 strdup(arg));
4929 if (!config.kconsumerd_cmd_unix_sock_path.value) {
4930 ret = -ENOMEM;
4931 PERROR("strdup");
4932 }
4933 }
4934 } else if (string_match(optname, "ustconsumerd64-err-sock")) {
4935 if (!arg || *arg == '\0') {
4936 ret = -EINVAL;
4937 goto end;
4938 }
4939 if (lttng_is_setuid_setgid()) {
4940 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4941 "--ustconsumerd64-err-sock");
4942 } else {
4943 config_string_set(&config.consumerd64_err_unix_sock_path,
4944 strdup(arg));
4945 if (!config.consumerd64_err_unix_sock_path.value) {
4946 ret = -ENOMEM;
4947 PERROR("strdup");
4948 }
4949 }
4950 } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
4951 if (!arg || *arg == '\0') {
4952 ret = -EINVAL;
4953 goto end;
4954 }
4955 if (lttng_is_setuid_setgid()) {
4956 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4957 "--ustconsumerd64-cmd-sock");
4958 } else {
4959 config_string_set(&config.consumerd64_cmd_unix_sock_path,
4960 strdup(arg));
4961 if (!config.consumerd64_cmd_unix_sock_path.value) {
4962 ret = -ENOMEM;
4963 PERROR("strdup");
4964 }
4965 }
4966 } else if (string_match(optname, "ustconsumerd32-err-sock")) {
4967 if (!arg || *arg == '\0') {
4968 ret = -EINVAL;
4969 goto end;
4970 }
4971 if (lttng_is_setuid_setgid()) {
4972 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4973 "--ustconsumerd32-err-sock");
4974 } else {
4975 config_string_set(&config.consumerd32_err_unix_sock_path,
4976 strdup(arg));
4977 if (!config.consumerd32_err_unix_sock_path.value) {
4978 ret = -ENOMEM;
4979 PERROR("strdup");
4980 }
4981 }
4982 } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
4983 if (!arg || *arg == '\0') {
4984 ret = -EINVAL;
4985 goto end;
4986 }
4987 if (lttng_is_setuid_setgid()) {
4988 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
4989 "--ustconsumerd32-cmd-sock");
4990 } else {
4991 config_string_set(&config.consumerd32_cmd_unix_sock_path,
4992 strdup(arg));
4993 if (!config.consumerd32_cmd_unix_sock_path.value) {
4994 ret = -ENOMEM;
4995 PERROR("strdup");
4996 }
4997 }
4998 } else if (string_match(optname, "no-kernel")) {
4999 config.no_kernel = true;
5000 } else if (string_match(optname, "quiet") || opt == 'q') {
5001 config.quiet = true;
5002 } else if (string_match(optname, "verbose") || opt == 'v') {
5003 /* Verbose level can increase using multiple -v */
5004 if (arg) {
5005 /* Value obtained from config file */
5006 config.verbose = config_parse_value(arg);
5007 } else {
5008 /* -v used on command line */
5009 config.verbose++;
5010 }
5011 /* Clamp value to [0, 3] */
5012 config.verbose = config.verbose < 0 ? 0 :
5013 (config.verbose <= 3 ? config.verbose : 3);
5014 } else if (string_match(optname, "verbose-consumer")) {
5015 if (arg) {
5016 config.verbose_consumer = config_parse_value(arg);
5017 } else {
5018 config.verbose_consumer++;
5019 }
5020 } else if (string_match(optname, "consumerd32-path")) {
5021 if (!arg || *arg == '\0') {
5022 ret = -EINVAL;
5023 goto end;
5024 }
5025 if (lttng_is_setuid_setgid()) {
5026 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5027 "--consumerd32-path");
5028 } else {
5029 config_string_set(&config.consumerd32_bin_path,
5030 strdup(arg));
5031 if (!config.consumerd32_bin_path.value) {
5032 PERROR("strdup");
5033 ret = -ENOMEM;
5034 }
5035 }
5036 } else if (string_match(optname, "consumerd32-libdir")) {
5037 if (!arg || *arg == '\0') {
5038 ret = -EINVAL;
5039 goto end;
5040 }
5041 if (lttng_is_setuid_setgid()) {
5042 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5043 "--consumerd32-libdir");
5044 } else {
5045 config_string_set(&config.consumerd32_lib_dir,
5046 strdup(arg));
5047 if (!config.consumerd32_lib_dir.value) {
5048 PERROR("strdup");
5049 ret = -ENOMEM;
5050 }
5051 }
5052 } else if (string_match(optname, "consumerd64-path")) {
5053 if (!arg || *arg == '\0') {
5054 ret = -EINVAL;
5055 goto end;
5056 }
5057 if (lttng_is_setuid_setgid()) {
5058 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5059 "--consumerd64-path");
5060 } else {
5061 config_string_set(&config.consumerd64_bin_path,
5062 strdup(arg));
5063 if (!config.consumerd64_bin_path.value) {
5064 PERROR("strdup");
5065 ret = -ENOMEM;
5066 }
5067 }
5068 } else if (string_match(optname, "consumerd64-libdir")) {
5069 if (!arg || *arg == '\0') {
5070 ret = -EINVAL;
5071 goto end;
5072 }
5073 if (lttng_is_setuid_setgid()) {
5074 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5075 "--consumerd64-libdir");
5076 } else {
5077 config_string_set(&config.consumerd64_lib_dir,
5078 strdup(arg));
5079 if (!config.consumerd64_lib_dir.value) {
5080 PERROR("strdup");
5081 ret = -ENOMEM;
5082 }
5083 }
5084 } else if (string_match(optname, "pidfile") || opt == 'p') {
5085 if (!arg || *arg == '\0') {
5086 ret = -EINVAL;
5087 goto end;
5088 }
5089 if (lttng_is_setuid_setgid()) {
5090 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5091 "-p, --pidfile");
5092 } else {
5093 config_string_set(&config.pid_file_path, strdup(arg));
5094 if (!config.pid_file_path.value) {
5095 PERROR("strdup");
5096 ret = -ENOMEM;
5097 }
5098 }
5099 } else if (string_match(optname, "agent-tcp-port")) {
5100 if (!arg || *arg == '\0') {
5101 ret = -EINVAL;
5102 goto end;
5103 }
5104 if (lttng_is_setuid_setgid()) {
5105 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5106 "--agent-tcp-port");
5107 } else {
5108 unsigned long v;
5109
5110 errno = 0;
5111 v = strtoul(arg, NULL, 0);
5112 if (errno != 0 || !isdigit(arg[0])) {
5113 ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
5114 return -1;
5115 }
5116 if (v == 0 || v >= 65535) {
5117 ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
5118 return -1;
5119 }
5120 config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v;
5121 DBG3("Agent TCP port set to non default: %i", (int) v);
5122 }
5123 } else if (string_match(optname, "load") || opt == 'l') {
5124 if (!arg || *arg == '\0') {
5125 ret = -EINVAL;
5126 goto end;
5127 }
5128 if (lttng_is_setuid_setgid()) {
5129 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5130 "-l, --load");
5131 } else {
5132 config_string_set(&config.load_session_path, strdup(arg));
5133 if (!config.load_session_path.value) {
5134 PERROR("strdup");
5135 ret = -ENOMEM;
5136 }
5137 }
5138 } else if (string_match(optname, "kmod-probes")) {
5139 if (!arg || *arg == '\0') {
5140 ret = -EINVAL;
5141 goto end;
5142 }
5143 if (lttng_is_setuid_setgid()) {
5144 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5145 "--kmod-probes");
5146 } else {
5147 config_string_set(&config.kmod_probes_list, strdup(arg));
5148 if (!config.kmod_probes_list.value) {
5149 PERROR("strdup");
5150 ret = -ENOMEM;
5151 }
5152 }
5153 } else if (string_match(optname, "extra-kmod-probes")) {
5154 if (!arg || *arg == '\0') {
5155 ret = -EINVAL;
5156 goto end;
5157 }
5158 if (lttng_is_setuid_setgid()) {
5159 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5160 "--extra-kmod-probes");
5161 } else {
5162 config_string_set(&config.kmod_extra_probes_list,
5163 strdup(arg));
5164 if (!config.kmod_extra_probes_list.value) {
5165 PERROR("strdup");
5166 ret = -ENOMEM;
5167 }
5168 }
5169 } else if (string_match(optname, "config") || opt == 'f') {
5170 /* This is handled in set_options() thus silent skip. */
5171 goto end;
5172 } else {
5173 /* Unknown option or other error.
5174 * Error is printed by getopt, just return */
5175 ret = -1;
5176 }
5177
5178 end:
5179 if (ret == -EINVAL) {
5180 const char *opt_name = "unknown";
5181 int i;
5182
5183 for (i = 0; i < sizeof(long_options) / sizeof(struct option);
5184 i++) {
5185 if (opt == long_options[i].val) {
5186 opt_name = long_options[i].name;
5187 break;
5188 }
5189 }
5190
5191 WARN("Invalid argument provided for option \"%s\", using default value.",
5192 opt_name);
5193 }
5194
5195 return ret;
5196 }
5197
5198 /*
5199 * config_entry_handler_cb used to handle options read from a config file.
5200 * See config_entry_handler_cb comment in common/config/session-config.h for the
5201 * return value conventions.
5202 */
5203 static int config_entry_handler(const struct config_entry *entry, void *unused)
5204 {
5205 int ret = 0, i;
5206
5207 if (!entry || !entry->name || !entry->value) {
5208 ret = -EINVAL;
5209 goto end;
5210 }
5211
5212 /* Check if the option is to be ignored */
5213 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
5214 if (!strcmp(entry->name, config_ignore_options[i])) {
5215 goto end;
5216 }
5217 }
5218
5219 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
5220 i++) {
5221
5222 /* Ignore if not fully matched. */
5223 if (strcmp(entry->name, long_options[i].name)) {
5224 continue;
5225 }
5226
5227 /*
5228 * If the option takes no argument on the command line, we have to
5229 * check if the value is "true". We support non-zero numeric values,
5230 * true, on and yes.
5231 */
5232 if (!long_options[i].has_arg) {
5233 ret = config_parse_value(entry->value);
5234 if (ret <= 0) {
5235 if (ret) {
5236 WARN("Invalid configuration value \"%s\" for option %s",
5237 entry->value, entry->name);
5238 }
5239 /* False, skip boolean config option. */
5240 goto end;
5241 }
5242 }
5243
5244 ret = set_option(long_options[i].val, entry->value, entry->name);
5245 goto end;
5246 }
5247
5248 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
5249
5250 end:
5251 return ret;
5252 }
5253
5254 /*
5255 * daemon configuration loading and argument parsing
5256 */
5257 static int set_options(int argc, char **argv)
5258 {
5259 int ret = 0, c = 0, option_index = 0;
5260 int orig_optopt = optopt, orig_optind = optind;
5261 char *optstring;
5262 const char *config_path = NULL;
5263
5264 optstring = utils_generate_optstring(long_options,
5265 sizeof(long_options) / sizeof(struct option));
5266 if (!optstring) {
5267 ret = -ENOMEM;
5268 goto end;
5269 }
5270
5271 /* Check for the --config option */
5272 while ((c = getopt_long(argc, argv, optstring, long_options,
5273 &option_index)) != -1) {
5274 if (c == '?') {
5275 ret = -EINVAL;
5276 goto end;
5277 } else if (c != 'f') {
5278 /* if not equal to --config option. */
5279 continue;
5280 }
5281
5282 if (lttng_is_setuid_setgid()) {
5283 WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
5284 "-f, --config");
5285 } else {
5286 config_path = utils_expand_path(optarg);
5287 if (!config_path) {
5288 ERR("Failed to resolve path: %s", optarg);
5289 }
5290 }
5291 }
5292
5293 ret = config_get_section_entries(config_path, config_section_name,
5294 config_entry_handler, NULL);
5295 if (ret) {
5296 if (ret > 0) {
5297 ERR("Invalid configuration option at line %i", ret);
5298 ret = -1;
5299 }
5300 goto end;
5301 }
5302
5303 /* Reset getopt's global state */
5304 optopt = orig_optopt;
5305 optind = orig_optind;
5306 while (1) {
5307 option_index = -1;
5308 /*
5309 * getopt_long() will not set option_index if it encounters a
5310 * short option.
5311 */
5312 c = getopt_long(argc, argv, optstring, long_options,
5313 &option_index);
5314 if (c == -1) {
5315 break;
5316 }
5317
5318 /*
5319 * Pass NULL as the long option name if popt left the index
5320 * unset.
5321 */
5322 ret = set_option(c, optarg,
5323 option_index < 0 ? NULL :
5324 long_options[option_index].name);
5325 if (ret < 0) {
5326 break;
5327 }
5328 }
5329
5330 end:
5331 free(optstring);
5332 return ret;
5333 }
5334
5335 /*
5336 * Creates the two needed socket by the daemon.
5337 * apps_sock - The communication socket for all UST apps.
5338 * client_sock - The communication of the cli tool (lttng).
5339 */
5340 static int init_daemon_socket(void)
5341 {
5342 int ret = 0;
5343 mode_t old_umask;
5344
5345 old_umask = umask(0);
5346
5347 /* Create client tool unix socket */
5348 client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value);
5349 if (client_sock < 0) {
5350 ERR("Create unix sock failed: %s", config.client_unix_sock_path.value);
5351 ret = -1;
5352 goto end;
5353 }
5354
5355 /* Set the cloexec flag */
5356 ret = utils_set_fd_cloexec(client_sock);
5357 if (ret < 0) {
5358 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
5359 "Continuing but note that the consumer daemon will have a "
5360 "reference to this socket on exec()", client_sock);
5361 }
5362
5363 /* File permission MUST be 660 */
5364 ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
5365 if (ret < 0) {
5366 ERR("Set file permissions failed: %s", config.client_unix_sock_path.value);
5367 PERROR("chmod");
5368 goto end;
5369 }
5370
5371 /* Create the application unix socket */
5372 apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value);
5373 if (apps_sock < 0) {
5374 ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value);
5375 ret = -1;
5376 goto end;
5377 }
5378
5379 /* Set the cloexec flag */
5380 ret = utils_set_fd_cloexec(apps_sock);
5381 if (ret < 0) {
5382 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
5383 "Continuing but note that the consumer daemon will have a "
5384 "reference to this socket on exec()", apps_sock);
5385 }
5386
5387 /* File permission MUST be 666 */
5388 ret = chmod(config.apps_unix_sock_path.value,
5389 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
5390 if (ret < 0) {
5391 ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value);
5392 PERROR("chmod");
5393 goto end;
5394 }
5395
5396 DBG3("Session daemon client socket %d and application socket %d created",
5397 client_sock, apps_sock);
5398
5399 end:
5400 umask(old_umask);
5401 return ret;
5402 }
5403
5404 /*
5405 * Create lockfile using the rundir and return its fd.
5406 */
5407 static int create_lockfile(void)
5408 {
5409 return utils_create_lock_file(config.lock_file_path.value);
5410 }
5411
5412 /*
5413 * Check if the global socket is available, and if a daemon is answering at the
5414 * other side. If yes, error is returned.
5415 *
5416 * Also attempts to create and hold the lock file.
5417 */
5418 static int check_existing_daemon(void)
5419 {
5420 int ret = 0;
5421
5422 /* Is there anybody out there ? */
5423 if (lttng_session_daemon_alive()) {
5424 ret = -EEXIST;
5425 goto end;
5426 }
5427
5428 lockfile_fd = create_lockfile();
5429 if (lockfile_fd < 0) {
5430 ret = -EEXIST;
5431 goto end;
5432 }
5433 end:
5434 return ret;
5435 }
5436
5437 static void sessiond_cleanup_lock_file(void)
5438 {
5439 int ret;
5440
5441 /*
5442 * Cleanup lock file by deleting it and finaly closing it which will
5443 * release the file system lock.
5444 */
5445 if (lockfile_fd >= 0) {
5446 ret = remove(config.lock_file_path.value);
5447 if (ret < 0) {
5448 PERROR("remove lock file");
5449 }
5450 ret = close(lockfile_fd);
5451 if (ret < 0) {
5452 PERROR("close lock file");
5453 }
5454 }
5455 }
5456
5457 /*
5458 * Set the tracing group gid onto the client socket.
5459 *
5460 * Race window between mkdir and chown is OK because we are going from more
5461 * permissive (root.root) to less permissive (root.tracing).
5462 */
5463 static int set_permissions(char *rundir)
5464 {
5465 int ret;
5466 gid_t gid;
5467
5468 gid = utils_get_group_id(config.tracing_group_name.value);
5469
5470 /* Set lttng run dir */
5471 ret = chown(rundir, 0, gid);
5472 if (ret < 0) {
5473 ERR("Unable to set group on %s", rundir);
5474 PERROR("chown");
5475 }
5476
5477 /*
5478 * Ensure all applications and tracing group can search the run
5479 * dir. Allow everyone to read the directory, since it does not
5480 * buy us anything to hide its content.
5481 */
5482 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
5483 if (ret < 0) {
5484 ERR("Unable to set permissions on %s", rundir);
5485 PERROR("chmod");
5486 }
5487
5488 /* lttng client socket path */
5489 ret = chown(config.client_unix_sock_path.value, 0, gid);
5490 if (ret < 0) {
5491 ERR("Unable to set group on %s", config.client_unix_sock_path.value);
5492 PERROR("chown");
5493 }
5494
5495 /* kconsumer error socket path */
5496 ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
5497 if (ret < 0) {
5498 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
5499 PERROR("chown");
5500 }
5501
5502 /* 64-bit ustconsumer error socket path */
5503 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
5504 if (ret < 0) {
5505 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
5506 PERROR("chown");
5507 }
5508
5509 /* 32-bit ustconsumer compat32 error socket path */
5510 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
5511 if (ret < 0) {
5512 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
5513 PERROR("chown");
5514 }
5515
5516 DBG("All permissions are set");
5517
5518 return ret;
5519 }
5520
5521 /*
5522 * Create the lttng run directory needed for all global sockets and pipe.
5523 */
5524 static int create_lttng_rundir(void)
5525 {
5526 int ret;
5527
5528 DBG3("Creating LTTng run directory: %s", config.rundir.value);
5529
5530 ret = mkdir(config.rundir.value, S_IRWXU);
5531 if (ret < 0) {
5532 if (errno != EEXIST) {
5533 ERR("Unable to create %s", config.rundir.value);
5534 goto error;
5535 } else {
5536 ret = 0;
5537 }
5538 }
5539
5540 error:
5541 return ret;
5542 }
5543
5544 /*
5545 * Setup sockets and directory needed by the consumerds' communication with the
5546 * session daemon.
5547 */
5548 static int set_consumer_sockets(struct consumer_data *consumer_data)
5549 {
5550 int ret;
5551 char *path = NULL;
5552
5553 switch (consumer_data->type) {
5554 case LTTNG_CONSUMER_KERNEL:
5555 path = config.kconsumerd_path.value;
5556 break;
5557 case LTTNG_CONSUMER64_UST:
5558 path = config.consumerd64_path.value;
5559 break;
5560 case LTTNG_CONSUMER32_UST:
5561 path = config.consumerd32_path.value;
5562 break;
5563 default:
5564 ERR("Consumer type unknown");
5565 ret = -EINVAL;
5566 goto error;
5567 }
5568 assert(path);
5569
5570 DBG2("Creating consumer directory: %s", path);
5571
5572 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
5573 if (ret < 0 && errno != EEXIST) {
5574 PERROR("mkdir");
5575 ERR("Failed to create %s", path);
5576 goto error;
5577 }
5578 if (is_root) {
5579 ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value));
5580 if (ret < 0) {
5581 ERR("Unable to set group on %s", path);
5582 PERROR("chown");
5583 goto error;
5584 }
5585 }
5586
5587 /* Create the consumerd error unix socket */
5588 consumer_data->err_sock =
5589 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
5590 if (consumer_data->err_sock < 0) {
5591 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
5592 ret = -1;
5593 goto error;
5594 }
5595
5596 /*
5597 * Set the CLOEXEC flag. Return code is useless because either way, the
5598 * show must go on.
5599 */
5600 ret = utils_set_fd_cloexec(consumer_data->err_sock);
5601 if (ret < 0) {
5602 PERROR("utils_set_fd_cloexec");
5603 /* continue anyway */
5604 }
5605
5606 /* File permission MUST be 660 */
5607 ret = chmod(consumer_data->err_unix_sock_path,
5608 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
5609 if (ret < 0) {
5610 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
5611 PERROR("chmod");
5612 goto error;
5613 }
5614
5615 error:
5616 return ret;
5617 }
5618
5619 /*
5620 * Signal handler for the daemon
5621 *
5622 * Simply stop all worker threads, leaving main() return gracefully after
5623 * joining all threads and calling cleanup().
5624 */
5625 static void sighandler(int sig)
5626 {
5627 switch (sig) {
5628 case SIGINT:
5629 DBG("SIGINT caught");
5630 stop_threads();
5631 break;
5632 case SIGTERM:
5633 DBG("SIGTERM caught");
5634 stop_threads();
5635 break;
5636 case SIGUSR1:
5637 CMM_STORE_SHARED(recv_child_signal, 1);
5638 break;
5639 default:
5640 break;
5641 }
5642 }
5643
5644 /*
5645 * Setup signal handler for :
5646 * SIGINT, SIGTERM, SIGPIPE
5647 */
5648 static int set_signal_handler(void)
5649 {
5650 int ret = 0;
5651 struct sigaction sa;
5652 sigset_t sigset;
5653
5654 if ((ret = sigemptyset(&sigset)) < 0) {
5655 PERROR("sigemptyset");
5656 return ret;
5657 }
5658
5659 sa.sa_mask = sigset;
5660 sa.sa_flags = 0;
5661
5662 sa.sa_handler = sighandler;
5663 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
5664 PERROR("sigaction");
5665 return ret;
5666 }
5667
5668 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
5669 PERROR("sigaction");
5670 return ret;
5671 }
5672
5673 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
5674 PERROR("sigaction");
5675 return ret;
5676 }
5677
5678 sa.sa_handler = SIG_IGN;
5679 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
5680 PERROR("sigaction");
5681 return ret;
5682 }
5683
5684 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
5685
5686 return ret;
5687 }
5688
5689 /*
5690 * Set open files limit to unlimited. This daemon can open a large number of
5691 * file descriptors in order to consume multiple kernel traces.
5692 */
5693 static void set_ulimit(void)
5694 {
5695 int ret;
5696 struct rlimit lim;
5697
5698 /* The kernel does not allow an infinite limit for open files */
5699 lim.rlim_cur = 65535;
5700 lim.rlim_max = 65535;
5701
5702 ret = setrlimit(RLIMIT_NOFILE, &lim);
5703 if (ret < 0) {
5704 PERROR("failed to set open files limit");
5705 }
5706 }
5707
5708 static int write_pidfile(void)
5709 {
5710 return utils_create_pid_file(getpid(), config.pid_file_path.value);
5711 }
5712
5713 static int set_clock_plugin_env(void)
5714 {
5715 int ret = 0;
5716 char *env_value = NULL;
5717
5718 if (!config.lttng_ust_clock_plugin.value) {
5719 goto end;
5720 }
5721
5722 ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s",
5723 config.lttng_ust_clock_plugin.value);
5724 if (ret < 0) {
5725 PERROR("asprintf");
5726 goto end;
5727 }
5728
5729 ret = putenv(env_value);
5730 if (ret) {
5731 free(env_value);
5732 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
5733 goto end;
5734 }
5735
5736 DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
5737 config.lttng_ust_clock_plugin.value);
5738 end:
5739 return ret;
5740 }
5741
5742 static
5743 struct rotation_thread_timer_queue *create_rotate_timer_queue(void)
5744 {
5745 struct rotation_thread_timer_queue *queue = NULL;
5746
5747 queue = zmalloc(sizeof(struct rotation_thread_timer_queue));
5748 if (!queue) {
5749 PERROR("Failed to allocate timer rotate queue");
5750 goto end;
5751 }
5752
5753 queue->event_pipe = lttng_pipe_open(FD_CLOEXEC | O_NONBLOCK);
5754 CDS_INIT_LIST_HEAD(&queue->list);
5755 pthread_mutex_init(&queue->lock, NULL);
5756
5757 end:
5758 return queue;
5759 }
5760
5761 static
5762 void destroy_rotate_timer_queue(struct rotation_thread_timer_queue *queue)
5763 {
5764 struct sessiond_rotation_timer *node, *tmp_node;
5765
5766 if (!queue) {
5767 return;
5768 }
5769
5770 lttng_pipe_destroy(queue->event_pipe);
5771
5772 pthread_mutex_lock(&queue->lock);
5773 /* Empty wait queue. */
5774 cds_list_for_each_entry_safe(node, tmp_node, &queue->list, head) {
5775 cds_list_del(&node->head);
5776 free(node);
5777 }
5778 pthread_mutex_unlock(&queue->lock);
5779
5780 pthread_mutex_destroy(&queue->lock);
5781 free(queue);
5782 }
5783
5784 /*
5785 * main
5786 */
5787 int main(int argc, char **argv)
5788 {
5789 int ret = 0, retval = 0;
5790 void *status;
5791 const char *env_app_timeout;
5792 struct lttng_pipe *ust32_channel_monitor_pipe = NULL,
5793 *ust64_channel_monitor_pipe = NULL,
5794 *kernel_channel_monitor_pipe = NULL;
5795 bool notification_thread_launched = false;
5796 bool rotation_thread_launched = false;
5797 bool timer_thread_launched = false;
5798 struct lttng_pipe *ust32_channel_rotate_pipe = NULL,
5799 *ust64_channel_rotate_pipe = NULL,
5800 *kernel_channel_rotate_pipe = NULL;
5801 struct timer_thread_parameters timer_thread_ctx;
5802 /* Queue of rotation jobs populated by the sessiond-timer. */
5803 struct rotation_thread_timer_queue *rotation_timer_queue = NULL;
5804 sem_t notification_thread_ready;
5805
5806 init_kernel_workarounds();
5807
5808 rcu_register_thread();
5809
5810 if (set_signal_handler()) {
5811 retval = -1;
5812 goto exit_set_signal_handler;
5813 }
5814
5815 if (sessiond_timer_signal_init()) {
5816 retval = -1;
5817 goto exit_set_signal_handler;
5818 }
5819
5820 page_size = sysconf(_SC_PAGESIZE);
5821 if (page_size < 0) {
5822 PERROR("sysconf _SC_PAGESIZE");
5823 page_size = LONG_MAX;
5824 WARN("Fallback page size to %ld", page_size);
5825 }
5826
5827 ret = sessiond_config_init(&config);
5828 if (ret) {
5829 retval = -1;
5830 goto exit_set_signal_handler;
5831 }
5832
5833 /*
5834 * Init config from environment variables.
5835 * Command line option override env configuration per-doc. Do env first.
5836 */
5837 sessiond_config_apply_env_config(&config);
5838
5839 /*
5840 * Parse arguments and load the daemon configuration file.
5841 *
5842 * We have an exit_options exit path to free memory reserved by
5843 * set_options. This is needed because the rest of sessiond_cleanup()
5844 * depends on ht_cleanup_thread, which depends on lttng_daemonize, which
5845 * depends on set_options.
5846 */
5847 progname = argv[0];
5848 if (set_options(argc, argv)) {
5849 retval = -1;
5850 goto exit_options;
5851 }
5852
5853 /*
5854 * Resolve all paths received as arguments, configuration option, or
5855 * through environment variable as absolute paths. This is necessary
5856 * since daemonizing causes the sessiond's current working directory
5857 * to '/'.
5858 */
5859 ret = sessiond_config_resolve_paths(&config);
5860 if (ret) {
5861 goto exit_options;
5862 }
5863
5864 /* Apply config. */
5865 lttng_opt_verbose = config.verbose;
5866 lttng_opt_quiet = config.quiet;
5867 kconsumer_data.err_unix_sock_path =
5868 config.kconsumerd_err_unix_sock_path.value;
5869 kconsumer_data.cmd_unix_sock_path =
5870 config.kconsumerd_cmd_unix_sock_path.value;
5871 ustconsumer32_data.err_unix_sock_path =
5872 config.consumerd32_err_unix_sock_path.value;
5873 ustconsumer32_data.cmd_unix_sock_path =
5874 config.consumerd32_cmd_unix_sock_path.value;
5875 ustconsumer64_data.err_unix_sock_path =
5876 config.consumerd64_err_unix_sock_path.value;
5877 ustconsumer64_data.cmd_unix_sock_path =
5878 config.consumerd64_cmd_unix_sock_path.value;
5879 set_clock_plugin_env();
5880
5881 sessiond_config_log(&config);
5882
5883 if (create_lttng_rundir()) {
5884 retval = -1;
5885 goto exit_options;
5886 }
5887
5888 /* Abort launch if a session daemon is already running. */
5889 if (check_existing_daemon()) {
5890 ERR("A session daemon is already running.");
5891 retval = -1;
5892 goto exit_options;
5893 }
5894
5895 /* Daemonize */
5896 if (config.daemonize || config.background) {
5897 int i;
5898
5899 ret = lttng_daemonize(&child_ppid, &recv_child_signal,
5900 !config.background);
5901 if (ret < 0) {
5902 retval = -1;
5903 goto exit_options;
5904 }
5905
5906 /*
5907 * We are in the child. Make sure all other file descriptors are
5908 * closed, in case we are called with more opened file
5909 * descriptors than the standard ones and the lock file.
5910 */
5911 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
5912 if (i == lockfile_fd) {
5913 continue;
5914 }
5915 (void) close(i);
5916 }
5917 }
5918
5919 if (run_as_create_worker(argv[0]) < 0) {
5920 goto exit_create_run_as_worker_cleanup;
5921 }
5922
5923 /*
5924 * Starting from here, we can create threads. This needs to be after
5925 * lttng_daemonize due to RCU.
5926 */
5927
5928 /*
5929 * Initialize the health check subsystem. This call should set the
5930 * appropriate time values.
5931 */
5932 health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
5933 if (!health_sessiond) {
5934 PERROR("health_app_create error");
5935 retval = -1;
5936 goto exit_health_sessiond_cleanup;
5937 }
5938
5939 /* Create thread to clean up RCU hash tables */
5940 if (init_ht_cleanup_thread(&ht_cleanup_thread)) {
5941 retval = -1;
5942 goto exit_ht_cleanup;
5943 }
5944
5945 /* Create thread quit pipe */
5946 if (init_thread_quit_pipe()) {
5947 retval = -1;
5948 goto exit_init_data;
5949 }
5950
5951 /* Check if daemon is UID = 0 */
5952 is_root = !getuid();
5953 if (is_root) {
5954 /* Create global run dir with root access */
5955
5956 kernel_channel_monitor_pipe = lttng_pipe_open(0);
5957 if (!kernel_channel_monitor_pipe) {
5958 ERR("Failed to create kernel consumer channel monitor pipe");
5959 retval = -1;
5960 goto exit_init_data;
5961 }
5962 kconsumer_data.channel_monitor_pipe =
5963 lttng_pipe_release_writefd(
5964 kernel_channel_monitor_pipe);
5965 if (kconsumer_data.channel_monitor_pipe < 0) {
5966 retval = -1;
5967 goto exit_init_data;
5968 }
5969 kernel_channel_rotate_pipe = lttng_pipe_open(0);
5970 if (!kernel_channel_rotate_pipe) {
5971 ERR("Failed to create kernel consumer channel rotate pipe");
5972 retval = -1;
5973 goto exit_init_data;
5974 }
5975 kconsumer_data.channel_rotate_pipe =
5976 lttng_pipe_release_writefd(
5977 kernel_channel_rotate_pipe);
5978 if (kconsumer_data.channel_rotate_pipe < 0) {
5979 retval = -1;
5980 goto exit_init_data;
5981 }
5982 }
5983
5984 /* Set consumer initial state */
5985 kernel_consumerd_state = CONSUMER_STOPPED;
5986 ust_consumerd_state = CONSUMER_STOPPED;
5987
5988 ust32_channel_monitor_pipe = lttng_pipe_open(0);
5989 if (!ust32_channel_monitor_pipe) {
5990 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
5991 retval = -1;
5992 goto exit_init_data;
5993 }
5994 ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd(
5995 ust32_channel_monitor_pipe);
5996 if (ustconsumer32_data.channel_monitor_pipe < 0) {
5997 retval = -1;
5998 goto exit_init_data;
5999 }
6000 ust32_channel_rotate_pipe = lttng_pipe_open(0);
6001 if (!ust32_channel_rotate_pipe) {
6002 ERR("Failed to create 32-bit user space consumer channel rotate pipe");
6003 retval = -1;
6004 goto exit_init_data;
6005 }
6006 ustconsumer32_data.channel_rotate_pipe = lttng_pipe_release_writefd(
6007 ust32_channel_rotate_pipe);
6008 if (ustconsumer32_data.channel_rotate_pipe < 0) {
6009 retval = -1;
6010 goto exit_init_data;
6011 }
6012
6013 /*
6014 * The rotation_timer_queue structure is shared between the sessiond timer
6015 * thread and the rotation thread. The main() keeps the ownership and
6016 * destroys it when both threads have quit.
6017 */
6018 rotation_timer_queue = create_rotate_timer_queue();
6019 if (!rotation_timer_queue) {
6020 retval = -1;
6021 goto exit_init_data;
6022 }
6023 timer_thread_ctx.rotation_timer_queue = rotation_timer_queue;
6024
6025 ust64_channel_monitor_pipe = lttng_pipe_open(0);
6026 if (!ust64_channel_monitor_pipe) {
6027 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
6028 retval = -1;
6029 goto exit_init_data;
6030 }
6031 ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd(
6032 ust64_channel_monitor_pipe);
6033 if (ustconsumer64_data.channel_monitor_pipe < 0) {
6034 retval = -1;
6035 goto exit_init_data;
6036 }
6037 ust64_channel_rotate_pipe = lttng_pipe_open(0);
6038 if (!ust64_channel_rotate_pipe) {
6039 ERR("Failed to create 64-bit user space consumer channel rotate pipe");
6040 retval = -1;
6041 goto exit_init_data;
6042 }
6043 ustconsumer64_data.channel_rotate_pipe = lttng_pipe_release_writefd(
6044 ust64_channel_rotate_pipe);
6045 if (ustconsumer64_data.channel_rotate_pipe < 0) {
6046 retval = -1;
6047 goto exit_init_data;
6048 }
6049
6050 /*
6051 * Init UST app hash table. Alloc hash table before this point since
6052 * cleanup() can get called after that point.
6053 */
6054 if (ust_app_ht_alloc()) {
6055 ERR("Failed to allocate UST app hash table");
6056 retval = -1;
6057 goto exit_init_data;
6058 }
6059
6060 /*
6061 * Initialize agent app hash table. We allocate the hash table here
6062 * since cleanup() can get called after this point.
6063 */
6064 if (agent_app_ht_alloc()) {
6065 ERR("Failed to allocate Agent app hash table");
6066 retval = -1;
6067 goto exit_init_data;
6068 }
6069
6070 /*
6071 * These actions must be executed as root. We do that *after* setting up
6072 * the sockets path because we MUST make the check for another daemon using
6073 * those paths *before* trying to set the kernel consumer sockets and init
6074 * kernel tracer.
6075 */
6076 if (is_root) {
6077 if (set_consumer_sockets(&kconsumer_data)) {
6078 retval = -1;
6079 goto exit_init_data;
6080 }
6081
6082 /* Setup kernel tracer */
6083 if (!config.no_kernel) {
6084 init_kernel_tracer();
6085 if (kernel_tracer_fd >= 0) {
6086 ret = syscall_init_table();
6087 if (ret < 0) {
6088 ERR("Unable to populate syscall table. "
6089 "Syscall tracing won't work "
6090 "for this session daemon.");
6091 }
6092 }
6093 }
6094
6095 /* Set ulimit for open files */
6096 set_ulimit();
6097 }
6098 /* init lttng_fd tracking must be done after set_ulimit. */
6099 lttng_fd_init();
6100
6101 if (set_consumer_sockets(&ustconsumer64_data)) {
6102 retval = -1;
6103 goto exit_init_data;
6104 }
6105
6106 if (set_consumer_sockets(&ustconsumer32_data)) {
6107 retval = -1;
6108 goto exit_init_data;
6109 }
6110
6111 /* Setup the needed unix socket */
6112 if (init_daemon_socket()) {
6113 retval = -1;
6114 goto exit_init_data;
6115 }
6116
6117 /* Set credentials to socket */
6118 if (is_root && set_permissions(config.rundir.value)) {
6119 retval = -1;
6120 goto exit_init_data;
6121 }
6122
6123 /* Get parent pid if -S, --sig-parent is specified. */
6124 if (config.sig_parent) {
6125 ppid = getppid();
6126 }
6127
6128 /* Setup the kernel pipe for waking up the kernel thread */
6129 if (is_root && !config.no_kernel) {
6130 if (utils_create_pipe_cloexec(kernel_poll_pipe)) {
6131 retval = -1;
6132 goto exit_init_data;
6133 }
6134 }
6135
6136 /* Setup the thread apps communication pipe. */
6137 if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
6138 retval = -1;
6139 goto exit_init_data;
6140 }
6141
6142 /* Setup the thread apps notify communication pipe. */
6143 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
6144 retval = -1;
6145 goto exit_init_data;
6146 }
6147
6148 /* Initialize global buffer per UID and PID registry. */
6149 buffer_reg_init_uid_registry();
6150 buffer_reg_init_pid_registry();
6151
6152 /* Init UST command queue. */
6153 cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
6154
6155 /*
6156 * Get session list pointer. This pointer MUST NOT be free'd. This list
6157 * is statically declared in session.c
6158 */
6159 session_list_ptr = session_get_list();
6160
6161 cmd_init();
6162
6163 /* Check for the application socket timeout env variable. */
6164 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
6165 if (env_app_timeout) {
6166 config.app_socket_timeout = atoi(env_app_timeout);
6167 } else {
6168 config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
6169 }
6170
6171 ret = write_pidfile();
6172 if (ret) {
6173 ERR("Error in write_pidfile");
6174 retval = -1;
6175 goto exit_init_data;
6176 }
6177
6178 /* Initialize communication library */
6179 lttcomm_init();
6180 /* Initialize TCP timeout values */
6181 lttcomm_inet_init();
6182
6183 if (load_session_init_data(&load_info) < 0) {
6184 retval = -1;
6185 goto exit_init_data;
6186 }
6187 load_info->path = config.load_session_path.value;
6188
6189 /* Create health-check thread. */
6190 ret = pthread_create(&health_thread, default_pthread_attr(),
6191 thread_manage_health, (void *) NULL);
6192 if (ret) {
6193 errno = ret;
6194 PERROR("pthread_create health");
6195 retval = -1;
6196 goto exit_health;
6197 }
6198
6199 /*
6200 * The rotation thread needs the notification thread to be ready before
6201 * creating the rotate_notification_channel, so we use this semaphore as
6202 * a rendez-vous point.
6203 */
6204 sem_init(&notification_thread_ready, 0, 0);
6205
6206 /* notification_thread_data acquires the pipes' read side. */
6207 notification_thread_handle = notification_thread_handle_create(
6208 ust32_channel_monitor_pipe,
6209 ust64_channel_monitor_pipe,
6210 kernel_channel_monitor_pipe,
6211 &notification_thread_ready);
6212 if (!notification_thread_handle) {
6213 retval = -1;
6214 ERR("Failed to create notification thread shared data");
6215 stop_threads();
6216 goto exit_notification;
6217 }
6218
6219 /* Create notification thread. */
6220 ret = pthread_create(&notification_thread, default_pthread_attr(),
6221 thread_notification, notification_thread_handle);
6222 if (ret) {
6223 errno = ret;
6224 PERROR("pthread_create notification");
6225 retval = -1;
6226 stop_threads();
6227 goto exit_notification;
6228 }
6229 notification_thread_launched = true;
6230
6231 /* Create timer thread. */
6232 ret = pthread_create(&timer_thread, default_pthread_attr(),
6233 sessiond_timer_thread, &timer_thread_ctx);
6234 if (ret) {
6235 errno = ret;
6236 PERROR("pthread_create timer");
6237 retval = -1;
6238 stop_threads();
6239 goto exit_notification;
6240 }
6241 timer_thread_launched = true;
6242
6243 /* rotation_thread_data acquires the pipes' read side. */
6244 rotation_thread_handle = rotation_thread_handle_create(
6245 ust32_channel_rotate_pipe,
6246 ust64_channel_rotate_pipe,
6247 kernel_channel_rotate_pipe,
6248 thread_quit_pipe[0],
6249 rotation_timer_queue,
6250 notification_thread_handle,
6251 &notification_thread_ready);
6252 if (!rotation_thread_handle) {
6253 retval = -1;
6254 ERR("Failed to create rotation thread shared data");
6255 stop_threads();
6256 goto exit_rotation;
6257 }
6258
6259 /* Create rotation thread. */
6260 ret = pthread_create(&rotation_thread, default_pthread_attr(),
6261 thread_rotation, rotation_thread_handle);
6262 if (ret) {
6263 errno = ret;
6264 PERROR("pthread_create rotation");
6265 retval = -1;
6266 stop_threads();
6267 goto exit_rotation;
6268 }
6269 rotation_thread_launched = true;
6270
6271 /* Create thread to manage the client socket */
6272 ret = pthread_create(&client_thread, default_pthread_attr(),
6273 thread_manage_clients, (void *) NULL);
6274 if (ret) {
6275 errno = ret;
6276 PERROR("pthread_create clients");
6277 retval = -1;
6278 stop_threads();
6279 goto exit_client;
6280 }
6281
6282 /* Create thread to dispatch registration */
6283 ret = pthread_create(&dispatch_thread, default_pthread_attr(),
6284 thread_dispatch_ust_registration, (void *) NULL);
6285 if (ret) {
6286 errno = ret;
6287 PERROR("pthread_create dispatch");
6288 retval = -1;
6289 stop_threads();
6290 goto exit_dispatch;
6291 }
6292
6293 /* Create thread to manage application registration. */
6294 ret = pthread_create(&reg_apps_thread, default_pthread_attr(),
6295 thread_registration_apps, (void *) NULL);
6296 if (ret) {
6297 errno = ret;
6298 PERROR("pthread_create registration");
6299 retval = -1;
6300 stop_threads();
6301 goto exit_reg_apps;
6302 }
6303
6304 /* Create thread to manage application socket */
6305 ret = pthread_create(&apps_thread, default_pthread_attr(),
6306 thread_manage_apps, (void *) NULL);
6307 if (ret) {
6308 errno = ret;
6309 PERROR("pthread_create apps");
6310 retval = -1;
6311 stop_threads();
6312 goto exit_apps;
6313 }
6314
6315 /* Create thread to manage application notify socket */
6316 ret = pthread_create(&apps_notify_thread, default_pthread_attr(),
6317 ust_thread_manage_notify, (void *) NULL);
6318 if (ret) {
6319 errno = ret;
6320 PERROR("pthread_create notify");
6321 retval = -1;
6322 stop_threads();
6323 goto exit_apps_notify;
6324 }
6325
6326 /* Create agent registration thread. */
6327 ret = pthread_create(&agent_reg_thread, default_pthread_attr(),
6328 agent_thread_manage_registration, (void *) NULL);
6329 if (ret) {
6330 errno = ret;
6331 PERROR("pthread_create agent");
6332 retval = -1;
6333 stop_threads();
6334 goto exit_agent_reg;
6335 }
6336
6337 /* Don't start this thread if kernel tracing is not requested nor root */
6338 if (is_root && !config.no_kernel) {
6339 /* Create kernel thread to manage kernel event */
6340 ret = pthread_create(&kernel_thread, default_pthread_attr(),
6341 thread_manage_kernel, (void *) NULL);
6342 if (ret) {
6343 errno = ret;
6344 PERROR("pthread_create kernel");
6345 retval = -1;
6346 stop_threads();
6347 goto exit_kernel;
6348 }
6349 }
6350
6351 /* Create session loading thread. */
6352 ret = pthread_create(&load_session_thread, default_pthread_attr(),
6353 thread_load_session, load_info);
6354 if (ret) {
6355 errno = ret;
6356 PERROR("pthread_create load_session_thread");
6357 retval = -1;
6358 stop_threads();
6359 goto exit_load_session;
6360 }
6361
6362 /*
6363 * This is where we start awaiting program completion (e.g. through
6364 * signal that asks threads to teardown).
6365 */
6366
6367 ret = pthread_join(load_session_thread, &status);
6368 if (ret) {
6369 errno = ret;
6370 PERROR("pthread_join load_session_thread");
6371 retval = -1;
6372 }
6373 exit_load_session:
6374
6375 if (is_root && !config.no_kernel) {
6376 ret = pthread_join(kernel_thread, &status);
6377 if (ret) {
6378 errno = ret;
6379 PERROR("pthread_join");
6380 retval = -1;
6381 }
6382 }
6383 exit_kernel:
6384
6385 ret = pthread_join(agent_reg_thread, &status);
6386 if (ret) {
6387 errno = ret;
6388 PERROR("pthread_join agent");
6389 retval = -1;
6390 }
6391 exit_agent_reg:
6392
6393 ret = pthread_join(apps_notify_thread, &status);
6394 if (ret) {
6395 errno = ret;
6396 PERROR("pthread_join apps notify");
6397 retval = -1;
6398 }
6399 exit_apps_notify:
6400
6401 ret = pthread_join(apps_thread, &status);
6402 if (ret) {
6403 errno = ret;
6404 PERROR("pthread_join apps");
6405 retval = -1;
6406 }
6407 exit_apps:
6408
6409 ret = pthread_join(reg_apps_thread, &status);
6410 if (ret) {
6411 errno = ret;
6412 PERROR("pthread_join");
6413 retval = -1;
6414 }
6415 exit_reg_apps:
6416
6417 /*
6418 * Join dispatch thread after joining reg_apps_thread to ensure
6419 * we don't leak applications in the queue.
6420 */
6421 ret = pthread_join(dispatch_thread, &status);
6422 if (ret) {
6423 errno = ret;
6424 PERROR("pthread_join");
6425 retval = -1;
6426 }
6427 exit_dispatch:
6428
6429 ret = pthread_join(client_thread, &status);
6430 if (ret) {
6431 errno = ret;
6432 PERROR("pthread_join");
6433 retval = -1;
6434 }
6435
6436 exit_client:
6437 exit_rotation:
6438 exit_notification:
6439 sem_destroy(&notification_thread_ready);
6440 ret = pthread_join(health_thread, &status);
6441 if (ret) {
6442 errno = ret;
6443 PERROR("pthread_join health thread");
6444 retval = -1;
6445 }
6446
6447 exit_health:
6448 exit_init_data:
6449 /*
6450 * Wait for all pending call_rcu work to complete before tearing
6451 * down data structures. call_rcu worker may be trying to
6452 * perform lookups in those structures.
6453 */
6454 rcu_barrier();
6455 /*
6456 * sessiond_cleanup() is called when no other thread is running, except
6457 * the ht_cleanup thread, which is needed to destroy the hash tables.
6458 */
6459 rcu_thread_online();
6460 sessiond_cleanup();
6461
6462 /*
6463 * Ensure all prior call_rcu are done. call_rcu callbacks may push
6464 * hash tables to the ht_cleanup thread. Therefore, we ensure that
6465 * the queue is empty before shutting down the clean-up thread.
6466 */
6467 rcu_barrier();
6468
6469 /*
6470 * The teardown of the notification system is performed after the
6471 * session daemon's teardown in order to allow it to be notified
6472 * of the active session and channels at the moment of the teardown.
6473 */
6474 if (notification_thread_handle) {
6475 if (notification_thread_launched) {
6476 notification_thread_command_quit(
6477 notification_thread_handle);
6478 ret = pthread_join(notification_thread, &status);
6479 if (ret) {
6480 errno = ret;
6481 PERROR("pthread_join notification thread");
6482 retval = -1;
6483 }
6484 }
6485 notification_thread_handle_destroy(notification_thread_handle);
6486 }
6487
6488 if (rotation_thread_handle) {
6489 if (rotation_thread_launched) {
6490 ret = pthread_join(rotation_thread, &status);
6491 if (ret) {
6492 errno = ret;
6493 PERROR("pthread_join rotation thread");
6494 retval = -1;
6495 }
6496 }
6497 rotation_thread_handle_destroy(rotation_thread_handle);
6498 }
6499
6500 if (timer_thread_launched) {
6501 kill(getpid(), LTTNG_SESSIOND_SIG_EXIT);
6502 ret = pthread_join(timer_thread, &status);
6503 if (ret) {
6504 errno = ret;
6505 PERROR("pthread_join timer thread");
6506 retval = -1;
6507 }
6508 }
6509
6510 /*
6511 * After the rotation and timer thread have quit, we can safely destroy
6512 * the rotation_timer_queue.
6513 */
6514 destroy_rotate_timer_queue(rotation_timer_queue);
6515
6516 rcu_thread_offline();
6517 rcu_unregister_thread();
6518
6519 ret = fini_ht_cleanup_thread(&ht_cleanup_thread);
6520 if (ret) {
6521 retval = -1;
6522 }
6523 lttng_pipe_destroy(ust32_channel_monitor_pipe);
6524 lttng_pipe_destroy(ust64_channel_monitor_pipe);
6525 lttng_pipe_destroy(kernel_channel_monitor_pipe);
6526 lttng_pipe_destroy(ust32_channel_rotate_pipe);
6527 lttng_pipe_destroy(ust64_channel_rotate_pipe);
6528 lttng_pipe_destroy(kernel_channel_rotate_pipe);
6529 exit_ht_cleanup:
6530
6531 health_app_destroy(health_sessiond);
6532 exit_health_sessiond_cleanup:
6533 exit_create_run_as_worker_cleanup:
6534
6535 exit_options:
6536 sessiond_cleanup_lock_file();
6537 sessiond_cleanup_options();
6538
6539 exit_set_signal_handler:
6540 if (!retval) {
6541 exit(EXIT_SUCCESS);
6542 } else {
6543 exit(EXIT_FAILURE);
6544 }
6545 }
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