Update version to v2.2.0-rc3
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <getopt.h>
21 #include <grp.h>
22 #include <limits.h>
23 #include <pthread.h>
24 #include <signal.h>
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <inttypes.h>
29 #include <sys/mman.h>
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <urcu/uatomic.h>
37 #include <unistd.h>
38 #include <config.h>
39
40 #include <common/common.h>
41 #include <common/compat/socket.h>
42 #include <common/defaults.h>
43 #include <common/kernel-consumer/kernel-consumer.h>
44 #include <common/futex.h>
45 #include <common/relayd/relayd.h>
46 #include <common/utils.h>
47
48 #include "lttng-sessiond.h"
49 #include "buffer-registry.h"
50 #include "channel.h"
51 #include "cmd.h"
52 #include "consumer.h"
53 #include "context.h"
54 #include "event.h"
55 #include "kernel.h"
56 #include "kernel-consumer.h"
57 #include "modprobe.h"
58 #include "shm.h"
59 #include "ust-ctl.h"
60 #include "ust-consumer.h"
61 #include "utils.h"
62 #include "fd-limit.h"
63 #include "health.h"
64 #include "testpoint.h"
65 #include "ust-thread.h"
66
67 #define CONSUMERD_FILE "lttng-consumerd"
68
69 /* Const values */
70 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
71
72 const char *progname;
73 const char *opt_tracing_group;
74 static const char *opt_pidfile;
75 static int opt_sig_parent;
76 static int opt_verbose_consumer;
77 static int opt_daemon;
78 static int opt_no_kernel;
79 static int is_root; /* Set to 1 if the daemon is running as root */
80 static pid_t ppid; /* Parent PID for --sig-parent option */
81 static char *rundir;
82
83 /*
84 * Consumer daemon specific control data. Every value not initialized here is
85 * set to 0 by the static definition.
86 */
87 static struct consumer_data kconsumer_data = {
88 .type = LTTNG_CONSUMER_KERNEL,
89 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
90 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
91 .err_sock = -1,
92 .cmd_sock = -1,
93 .metadata_sock.fd = -1,
94 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
95 .lock = PTHREAD_MUTEX_INITIALIZER,
96 .cond = PTHREAD_COND_INITIALIZER,
97 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
98 };
99 static struct consumer_data ustconsumer64_data = {
100 .type = LTTNG_CONSUMER64_UST,
101 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
103 .err_sock = -1,
104 .cmd_sock = -1,
105 .metadata_sock.fd = -1,
106 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
107 .lock = PTHREAD_MUTEX_INITIALIZER,
108 .cond = PTHREAD_COND_INITIALIZER,
109 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
110 };
111 static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
115 .err_sock = -1,
116 .cmd_sock = -1,
117 .metadata_sock.fd = -1,
118 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
119 .lock = PTHREAD_MUTEX_INITIALIZER,
120 .cond = PTHREAD_COND_INITIALIZER,
121 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
122 };
123
124 /* Shared between threads */
125 static int dispatch_thread_exit;
126
127 /* Global application Unix socket path */
128 static char apps_unix_sock_path[PATH_MAX];
129 /* Global client Unix socket path */
130 static char client_unix_sock_path[PATH_MAX];
131 /* global wait shm path for UST */
132 static char wait_shm_path[PATH_MAX];
133 /* Global health check unix path */
134 static char health_unix_sock_path[PATH_MAX];
135
136 /* Sockets and FDs */
137 static int client_sock = -1;
138 static int apps_sock = -1;
139 int kernel_tracer_fd = -1;
140 static int kernel_poll_pipe[2] = { -1, -1 };
141
142 /*
143 * Quit pipe for all threads. This permits a single cancellation point
144 * for all threads when receiving an event on the pipe.
145 */
146 static int thread_quit_pipe[2] = { -1, -1 };
147
148 /*
149 * This pipe is used to inform the thread managing application communication
150 * that a command is queued and ready to be processed.
151 */
152 static int apps_cmd_pipe[2] = { -1, -1 };
153
154 int apps_cmd_notify_pipe[2] = { -1, -1 };
155
156 /* Pthread, Mutexes and Semaphores */
157 static pthread_t apps_thread;
158 static pthread_t apps_notify_thread;
159 static pthread_t reg_apps_thread;
160 static pthread_t client_thread;
161 static pthread_t kernel_thread;
162 static pthread_t dispatch_thread;
163 static pthread_t health_thread;
164 static pthread_t ht_cleanup_thread;
165
166 /*
167 * UST registration command queue. This queue is tied with a futex and uses a N
168 * wakers / 1 waiter implemented and detailed in futex.c/.h
169 *
170 * The thread_manage_apps and thread_dispatch_ust_registration interact with
171 * this queue and the wait/wake scheme.
172 */
173 static struct ust_cmd_queue ust_cmd_queue;
174
175 /*
176 * Pointer initialized before thread creation.
177 *
178 * This points to the tracing session list containing the session count and a
179 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
180 * MUST NOT be taken if you call a public function in session.c.
181 *
182 * The lock is nested inside the structure: session_list_ptr->lock. Please use
183 * session_lock_list and session_unlock_list for lock acquisition.
184 */
185 static struct ltt_session_list *session_list_ptr;
186
187 int ust_consumerd64_fd = -1;
188 int ust_consumerd32_fd = -1;
189
190 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
191 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
192 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
193 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
194
195 static const char *module_proc_lttng = "/proc/lttng";
196
197 /*
198 * Consumer daemon state which is changed when spawning it, killing it or in
199 * case of a fatal error.
200 */
201 enum consumerd_state {
202 CONSUMER_STARTED = 1,
203 CONSUMER_STOPPED = 2,
204 CONSUMER_ERROR = 3,
205 };
206
207 /*
208 * This consumer daemon state is used to validate if a client command will be
209 * able to reach the consumer. If not, the client is informed. For instance,
210 * doing a "lttng start" when the consumer state is set to ERROR will return an
211 * error to the client.
212 *
213 * The following example shows a possible race condition of this scheme:
214 *
215 * consumer thread error happens
216 * client cmd arrives
217 * client cmd checks state -> still OK
218 * consumer thread exit, sets error
219 * client cmd try to talk to consumer
220 * ...
221 *
222 * However, since the consumer is a different daemon, we have no way of making
223 * sure the command will reach it safely even with this state flag. This is why
224 * we consider that up to the state validation during command processing, the
225 * command is safe. After that, we can not guarantee the correctness of the
226 * client request vis-a-vis the consumer.
227 */
228 static enum consumerd_state ust_consumerd_state;
229 static enum consumerd_state kernel_consumerd_state;
230
231 /*
232 * Socket timeout for receiving and sending in seconds.
233 */
234 static int app_socket_timeout;
235
236 /* Set in main() with the current page size. */
237 long page_size;
238
239 static
240 void setup_consumerd_path(void)
241 {
242 const char *bin, *libdir;
243
244 /*
245 * Allow INSTALL_BIN_PATH to be used as a target path for the
246 * native architecture size consumer if CONFIG_CONSUMER*_PATH
247 * has not been defined.
248 */
249 #if (CAA_BITS_PER_LONG == 32)
250 if (!consumerd32_bin[0]) {
251 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
252 }
253 if (!consumerd32_libdir[0]) {
254 consumerd32_libdir = INSTALL_LIB_PATH;
255 }
256 #elif (CAA_BITS_PER_LONG == 64)
257 if (!consumerd64_bin[0]) {
258 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
259 }
260 if (!consumerd64_libdir[0]) {
261 consumerd64_libdir = INSTALL_LIB_PATH;
262 }
263 #else
264 #error "Unknown bitness"
265 #endif
266
267 /*
268 * runtime env. var. overrides the build default.
269 */
270 bin = getenv("LTTNG_CONSUMERD32_BIN");
271 if (bin) {
272 consumerd32_bin = bin;
273 }
274 bin = getenv("LTTNG_CONSUMERD64_BIN");
275 if (bin) {
276 consumerd64_bin = bin;
277 }
278 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
279 if (libdir) {
280 consumerd32_libdir = libdir;
281 }
282 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
283 if (libdir) {
284 consumerd64_libdir = libdir;
285 }
286 }
287
288 /*
289 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
290 */
291 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
292 {
293 int ret;
294
295 assert(events);
296
297 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
298 if (ret < 0) {
299 goto error;
300 }
301
302 /* Add quit pipe */
303 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
304 if (ret < 0) {
305 goto error;
306 }
307
308 return 0;
309
310 error:
311 return ret;
312 }
313
314 /*
315 * Check if the thread quit pipe was triggered.
316 *
317 * Return 1 if it was triggered else 0;
318 */
319 int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
320 {
321 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
322 return 1;
323 }
324
325 return 0;
326 }
327
328 /*
329 * Return group ID of the tracing group or -1 if not found.
330 */
331 static gid_t allowed_group(void)
332 {
333 struct group *grp;
334
335 if (opt_tracing_group) {
336 grp = getgrnam(opt_tracing_group);
337 } else {
338 grp = getgrnam(default_tracing_group);
339 }
340 if (!grp) {
341 return -1;
342 } else {
343 return grp->gr_gid;
344 }
345 }
346
347 /*
348 * Init thread quit pipe.
349 *
350 * Return -1 on error or 0 if all pipes are created.
351 */
352 static int init_thread_quit_pipe(void)
353 {
354 int ret, i;
355
356 ret = pipe(thread_quit_pipe);
357 if (ret < 0) {
358 PERROR("thread quit pipe");
359 goto error;
360 }
361
362 for (i = 0; i < 2; i++) {
363 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
364 if (ret < 0) {
365 PERROR("fcntl");
366 goto error;
367 }
368 }
369
370 error:
371 return ret;
372 }
373
374 /*
375 * Stop all threads by closing the thread quit pipe.
376 */
377 static void stop_threads(void)
378 {
379 int ret;
380
381 /* Stopping all threads */
382 DBG("Terminating all threads");
383 ret = notify_thread_pipe(thread_quit_pipe[1]);
384 if (ret < 0) {
385 ERR("write error on thread quit pipe");
386 }
387
388 /* Dispatch thread */
389 CMM_STORE_SHARED(dispatch_thread_exit, 1);
390 futex_nto1_wake(&ust_cmd_queue.futex);
391 }
392
393 /*
394 * Cleanup the daemon
395 */
396 static void cleanup(void)
397 {
398 int ret;
399 char *cmd = NULL;
400 struct ltt_session *sess, *stmp;
401
402 DBG("Cleaning up");
403
404 /* First thing first, stop all threads */
405 utils_close_pipe(thread_quit_pipe);
406
407 /*
408 * If opt_pidfile is undefined, the default file will be wiped when
409 * removing the rundir.
410 */
411 if (opt_pidfile) {
412 ret = remove(opt_pidfile);
413 if (ret < 0) {
414 PERROR("remove pidfile %s", opt_pidfile);
415 }
416 }
417
418 DBG("Removing %s directory", rundir);
419 ret = asprintf(&cmd, "rm -rf %s", rundir);
420 if (ret < 0) {
421 ERR("asprintf failed. Something is really wrong!");
422 }
423
424 /* Remove lttng run directory */
425 ret = system(cmd);
426 if (ret < 0) {
427 ERR("Unable to clean %s", rundir);
428 }
429 free(cmd);
430 free(rundir);
431
432 DBG("Cleaning up all sessions");
433
434 /* Destroy session list mutex */
435 if (session_list_ptr != NULL) {
436 pthread_mutex_destroy(&session_list_ptr->lock);
437
438 /* Cleanup ALL session */
439 cds_list_for_each_entry_safe(sess, stmp,
440 &session_list_ptr->head, list) {
441 cmd_destroy_session(sess, kernel_poll_pipe[1]);
442 }
443 }
444
445 DBG("Closing all UST sockets");
446 ust_app_clean_list();
447 buffer_reg_destroy_registries();
448
449 if (is_root && !opt_no_kernel) {
450 DBG2("Closing kernel fd");
451 if (kernel_tracer_fd >= 0) {
452 ret = close(kernel_tracer_fd);
453 if (ret) {
454 PERROR("close");
455 }
456 }
457 DBG("Unloading kernel modules");
458 modprobe_remove_lttng_all();
459 }
460
461 /* <fun> */
462 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
463 "Matthew, BEET driven development works!%c[%dm",
464 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
465 /* </fun> */
466 }
467
468 /*
469 * Send data on a unix socket using the liblttsessiondcomm API.
470 *
471 * Return lttcomm error code.
472 */
473 static int send_unix_sock(int sock, void *buf, size_t len)
474 {
475 /* Check valid length */
476 if (len == 0) {
477 return -1;
478 }
479
480 return lttcomm_send_unix_sock(sock, buf, len);
481 }
482
483 /*
484 * Free memory of a command context structure.
485 */
486 static void clean_command_ctx(struct command_ctx **cmd_ctx)
487 {
488 DBG("Clean command context structure");
489 if (*cmd_ctx) {
490 if ((*cmd_ctx)->llm) {
491 free((*cmd_ctx)->llm);
492 }
493 if ((*cmd_ctx)->lsm) {
494 free((*cmd_ctx)->lsm);
495 }
496 free(*cmd_ctx);
497 *cmd_ctx = NULL;
498 }
499 }
500
501 /*
502 * Notify UST applications using the shm mmap futex.
503 */
504 static int notify_ust_apps(int active)
505 {
506 char *wait_shm_mmap;
507
508 DBG("Notifying applications of session daemon state: %d", active);
509
510 /* See shm.c for this call implying mmap, shm and futex calls */
511 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
512 if (wait_shm_mmap == NULL) {
513 goto error;
514 }
515
516 /* Wake waiting process */
517 futex_wait_update((int32_t *) wait_shm_mmap, active);
518
519 /* Apps notified successfully */
520 return 0;
521
522 error:
523 return -1;
524 }
525
526 /*
527 * Setup the outgoing data buffer for the response (llm) by allocating the
528 * right amount of memory and copying the original information from the lsm
529 * structure.
530 *
531 * Return total size of the buffer pointed by buf.
532 */
533 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
534 {
535 int ret, buf_size;
536
537 buf_size = size;
538
539 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
540 if (cmd_ctx->llm == NULL) {
541 PERROR("zmalloc");
542 ret = -ENOMEM;
543 goto error;
544 }
545
546 /* Copy common data */
547 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
548 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
549
550 cmd_ctx->llm->data_size = size;
551 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
552
553 return buf_size;
554
555 error:
556 return ret;
557 }
558
559 /*
560 * Update the kernel poll set of all channel fd available over all tracing
561 * session. Add the wakeup pipe at the end of the set.
562 */
563 static int update_kernel_poll(struct lttng_poll_event *events)
564 {
565 int ret;
566 struct ltt_session *session;
567 struct ltt_kernel_channel *channel;
568
569 DBG("Updating kernel poll set");
570
571 session_lock_list();
572 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
573 session_lock(session);
574 if (session->kernel_session == NULL) {
575 session_unlock(session);
576 continue;
577 }
578
579 cds_list_for_each_entry(channel,
580 &session->kernel_session->channel_list.head, list) {
581 /* Add channel fd to the kernel poll set */
582 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
583 if (ret < 0) {
584 session_unlock(session);
585 goto error;
586 }
587 DBG("Channel fd %d added to kernel set", channel->fd);
588 }
589 session_unlock(session);
590 }
591 session_unlock_list();
592
593 return 0;
594
595 error:
596 session_unlock_list();
597 return -1;
598 }
599
600 /*
601 * Find the channel fd from 'fd' over all tracing session. When found, check
602 * for new channel stream and send those stream fds to the kernel consumer.
603 *
604 * Useful for CPU hotplug feature.
605 */
606 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
607 {
608 int ret = 0;
609 struct ltt_session *session;
610 struct ltt_kernel_session *ksess;
611 struct ltt_kernel_channel *channel;
612
613 DBG("Updating kernel streams for channel fd %d", fd);
614
615 session_lock_list();
616 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
617 session_lock(session);
618 if (session->kernel_session == NULL) {
619 session_unlock(session);
620 continue;
621 }
622 ksess = session->kernel_session;
623
624 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
625 if (channel->fd == fd) {
626 DBG("Channel found, updating kernel streams");
627 ret = kernel_open_channel_stream(channel);
628 if (ret < 0) {
629 goto error;
630 }
631
632 /*
633 * Have we already sent fds to the consumer? If yes, it means
634 * that tracing is started so it is safe to send our updated
635 * stream fds.
636 */
637 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
638 struct lttng_ht_iter iter;
639 struct consumer_socket *socket;
640
641 rcu_read_lock();
642 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
643 &iter.iter, socket, node.node) {
644 /* Code flow error */
645 assert(socket->fd >= 0);
646
647 pthread_mutex_lock(socket->lock);
648 ret = kernel_consumer_send_channel_stream(socket,
649 channel, ksess);
650 pthread_mutex_unlock(socket->lock);
651 if (ret < 0) {
652 rcu_read_unlock();
653 goto error;
654 }
655 }
656 rcu_read_unlock();
657 }
658 goto error;
659 }
660 }
661 session_unlock(session);
662 }
663 session_unlock_list();
664 return ret;
665
666 error:
667 session_unlock(session);
668 session_unlock_list();
669 return ret;
670 }
671
672 /*
673 * For each tracing session, update newly registered apps. The session list
674 * lock MUST be acquired before calling this.
675 */
676 static void update_ust_app(int app_sock)
677 {
678 struct ltt_session *sess, *stmp;
679
680 /* For all tracing session(s) */
681 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
682 session_lock(sess);
683 if (sess->ust_session) {
684 ust_app_global_update(sess->ust_session, app_sock);
685 }
686 session_unlock(sess);
687 }
688 }
689
690 /*
691 * This thread manage event coming from the kernel.
692 *
693 * Features supported in this thread:
694 * -) CPU Hotplug
695 */
696 static void *thread_manage_kernel(void *data)
697 {
698 int ret, i, pollfd, update_poll_flag = 1, err = -1;
699 uint32_t revents, nb_fd;
700 char tmp;
701 struct lttng_poll_event events;
702
703 DBG("[thread] Thread manage kernel started");
704
705 health_register(HEALTH_TYPE_KERNEL);
706
707 /*
708 * This first step of the while is to clean this structure which could free
709 * non NULL pointers so initialize it before the loop.
710 */
711 lttng_poll_init(&events);
712
713 if (testpoint(thread_manage_kernel)) {
714 goto error_testpoint;
715 }
716
717 health_code_update();
718
719 if (testpoint(thread_manage_kernel_before_loop)) {
720 goto error_testpoint;
721 }
722
723 while (1) {
724 health_code_update();
725
726 if (update_poll_flag == 1) {
727 /* Clean events object. We are about to populate it again. */
728 lttng_poll_clean(&events);
729
730 ret = sessiond_set_thread_pollset(&events, 2);
731 if (ret < 0) {
732 goto error_poll_create;
733 }
734
735 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
736 if (ret < 0) {
737 goto error;
738 }
739
740 /* This will add the available kernel channel if any. */
741 ret = update_kernel_poll(&events);
742 if (ret < 0) {
743 goto error;
744 }
745 update_poll_flag = 0;
746 }
747
748 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
749
750 /* Poll infinite value of time */
751 restart:
752 health_poll_entry();
753 ret = lttng_poll_wait(&events, -1);
754 health_poll_exit();
755 if (ret < 0) {
756 /*
757 * Restart interrupted system call.
758 */
759 if (errno == EINTR) {
760 goto restart;
761 }
762 goto error;
763 } else if (ret == 0) {
764 /* Should not happen since timeout is infinite */
765 ERR("Return value of poll is 0 with an infinite timeout.\n"
766 "This should not have happened! Continuing...");
767 continue;
768 }
769
770 nb_fd = ret;
771
772 for (i = 0; i < nb_fd; i++) {
773 /* Fetch once the poll data */
774 revents = LTTNG_POLL_GETEV(&events, i);
775 pollfd = LTTNG_POLL_GETFD(&events, i);
776
777 health_code_update();
778
779 /* Thread quit pipe has been closed. Killing thread. */
780 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
781 if (ret) {
782 err = 0;
783 goto exit;
784 }
785
786 /* Check for data on kernel pipe */
787 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
788 do {
789 ret = read(kernel_poll_pipe[0], &tmp, 1);
790 } while (ret < 0 && errno == EINTR);
791 /*
792 * Ret value is useless here, if this pipe gets any actions an
793 * update is required anyway.
794 */
795 update_poll_flag = 1;
796 continue;
797 } else {
798 /*
799 * New CPU detected by the kernel. Adding kernel stream to
800 * kernel session and updating the kernel consumer
801 */
802 if (revents & LPOLLIN) {
803 ret = update_kernel_stream(&kconsumer_data, pollfd);
804 if (ret < 0) {
805 continue;
806 }
807 break;
808 /*
809 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
810 * and unregister kernel stream at this point.
811 */
812 }
813 }
814 }
815 }
816
817 exit:
818 error:
819 lttng_poll_clean(&events);
820 error_poll_create:
821 error_testpoint:
822 utils_close_pipe(kernel_poll_pipe);
823 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
824 if (err) {
825 health_error();
826 ERR("Health error occurred in %s", __func__);
827 WARN("Kernel thread died unexpectedly. "
828 "Kernel tracing can continue but CPU hotplug is disabled.");
829 }
830 health_unregister();
831 DBG("Kernel thread dying");
832 return NULL;
833 }
834
835 /*
836 * Signal pthread condition of the consumer data that the thread.
837 */
838 static void signal_consumer_condition(struct consumer_data *data, int state)
839 {
840 pthread_mutex_lock(&data->cond_mutex);
841
842 /*
843 * The state is set before signaling. It can be any value, it's the waiter
844 * job to correctly interpret this condition variable associated to the
845 * consumer pthread_cond.
846 *
847 * A value of 0 means that the corresponding thread of the consumer data
848 * was not started. 1 indicates that the thread has started and is ready
849 * for action. A negative value means that there was an error during the
850 * thread bootstrap.
851 */
852 data->consumer_thread_is_ready = state;
853 (void) pthread_cond_signal(&data->cond);
854
855 pthread_mutex_unlock(&data->cond_mutex);
856 }
857
858 /*
859 * This thread manage the consumer error sent back to the session daemon.
860 */
861 static void *thread_manage_consumer(void *data)
862 {
863 int sock = -1, i, ret, pollfd, err = -1;
864 uint32_t revents, nb_fd;
865 enum lttcomm_return_code code;
866 struct lttng_poll_event events;
867 struct consumer_data *consumer_data = data;
868
869 DBG("[thread] Manage consumer started");
870
871 health_register(HEALTH_TYPE_CONSUMER);
872
873 health_code_update();
874
875 /*
876 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
877 * metadata_sock. Nothing more will be added to this poll set.
878 */
879 ret = sessiond_set_thread_pollset(&events, 3);
880 if (ret < 0) {
881 goto error_poll;
882 }
883
884 /*
885 * The error socket here is already in a listening state which was done
886 * just before spawning this thread to avoid a race between the consumer
887 * daemon exec trying to connect and the listen() call.
888 */
889 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
890 if (ret < 0) {
891 goto error;
892 }
893
894 health_code_update();
895
896 /* Infinite blocking call, waiting for transmission */
897 restart:
898 health_poll_entry();
899
900 if (testpoint(thread_manage_consumer)) {
901 goto error;
902 }
903
904 ret = lttng_poll_wait(&events, -1);
905 health_poll_exit();
906 if (ret < 0) {
907 /*
908 * Restart interrupted system call.
909 */
910 if (errno == EINTR) {
911 goto restart;
912 }
913 goto error;
914 }
915
916 nb_fd = ret;
917
918 for (i = 0; i < nb_fd; i++) {
919 /* Fetch once the poll data */
920 revents = LTTNG_POLL_GETEV(&events, i);
921 pollfd = LTTNG_POLL_GETFD(&events, i);
922
923 health_code_update();
924
925 /* Thread quit pipe has been closed. Killing thread. */
926 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
927 if (ret) {
928 err = 0;
929 goto exit;
930 }
931
932 /* Event on the registration socket */
933 if (pollfd == consumer_data->err_sock) {
934 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
935 ERR("consumer err socket poll error");
936 goto error;
937 }
938 }
939 }
940
941 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
942 if (sock < 0) {
943 goto error;
944 }
945
946 /*
947 * Set the CLOEXEC flag. Return code is useless because either way, the
948 * show must go on.
949 */
950 (void) utils_set_fd_cloexec(sock);
951
952 health_code_update();
953
954 DBG2("Receiving code from consumer err_sock");
955
956 /* Getting status code from kconsumerd */
957 ret = lttcomm_recv_unix_sock(sock, &code,
958 sizeof(enum lttcomm_return_code));
959 if (ret <= 0) {
960 goto error;
961 }
962
963 health_code_update();
964
965 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
966 /* Connect both socket, command and metadata. */
967 consumer_data->cmd_sock =
968 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
969 consumer_data->metadata_sock.fd =
970 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
971 if (consumer_data->cmd_sock < 0 ||
972 consumer_data->metadata_sock.fd < 0) {
973 PERROR("consumer connect cmd socket");
974 /* On error, signal condition and quit. */
975 signal_consumer_condition(consumer_data, -1);
976 goto error;
977 }
978 /* Create metadata socket lock. */
979 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
980 if (consumer_data->metadata_sock.lock == NULL) {
981 PERROR("zmalloc pthread mutex");
982 ret = -1;
983 goto error;
984 }
985 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
986
987 signal_consumer_condition(consumer_data, 1);
988 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
989 DBG("Consumer metadata socket ready (fd: %d)",
990 consumer_data->metadata_sock.fd);
991 } else {
992 ERR("consumer error when waiting for SOCK_READY : %s",
993 lttcomm_get_readable_code(-code));
994 goto error;
995 }
996
997 /* Remove the consumerd error sock since we've established a connexion */
998 ret = lttng_poll_del(&events, consumer_data->err_sock);
999 if (ret < 0) {
1000 goto error;
1001 }
1002
1003 /* Add new accepted error socket. */
1004 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1005 if (ret < 0) {
1006 goto error;
1007 }
1008
1009 /* Add metadata socket that is successfully connected. */
1010 ret = lttng_poll_add(&events, consumer_data->metadata_sock.fd,
1011 LPOLLIN | LPOLLRDHUP);
1012 if (ret < 0) {
1013 goto error;
1014 }
1015
1016 health_code_update();
1017
1018 /* Infinite blocking call, waiting for transmission */
1019 restart_poll:
1020 while (1) {
1021 health_poll_entry();
1022 ret = lttng_poll_wait(&events, -1);
1023 health_poll_exit();
1024 if (ret < 0) {
1025 /*
1026 * Restart interrupted system call.
1027 */
1028 if (errno == EINTR) {
1029 goto restart_poll;
1030 }
1031 goto error;
1032 }
1033
1034 nb_fd = ret;
1035
1036 for (i = 0; i < nb_fd; i++) {
1037 /* Fetch once the poll data */
1038 revents = LTTNG_POLL_GETEV(&events, i);
1039 pollfd = LTTNG_POLL_GETFD(&events, i);
1040
1041 health_code_update();
1042
1043 /* Thread quit pipe has been closed. Killing thread. */
1044 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1045 if (ret) {
1046 err = 0;
1047 goto exit;
1048 }
1049
1050 if (pollfd == sock) {
1051 /* Event on the consumerd socket */
1052 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1053 ERR("consumer err socket second poll error");
1054 goto error;
1055 }
1056 health_code_update();
1057 /* Wait for any kconsumerd error */
1058 ret = lttcomm_recv_unix_sock(sock, &code,
1059 sizeof(enum lttcomm_return_code));
1060 if (ret <= 0) {
1061 ERR("consumer closed the command socket");
1062 goto error;
1063 }
1064
1065 ERR("consumer return code : %s",
1066 lttcomm_get_readable_code(-code));
1067
1068 goto exit;
1069 } else if (pollfd == consumer_data->metadata_sock.fd) {
1070 /* UST metadata requests */
1071 ret = ust_consumer_metadata_request(
1072 &consumer_data->metadata_sock);
1073 if (ret < 0) {
1074 ERR("Handling metadata request");
1075 goto error;
1076 }
1077 break;
1078 } else {
1079 ERR("Unknown pollfd");
1080 goto error;
1081 }
1082 }
1083 health_code_update();
1084 }
1085
1086 exit:
1087 error:
1088 /* Immediately set the consumerd state to stopped */
1089 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1090 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1091 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1092 consumer_data->type == LTTNG_CONSUMER32_UST) {
1093 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1094 } else {
1095 /* Code flow error... */
1096 assert(0);
1097 }
1098
1099 if (consumer_data->err_sock >= 0) {
1100 ret = close(consumer_data->err_sock);
1101 if (ret) {
1102 PERROR("close");
1103 }
1104 }
1105 if (consumer_data->cmd_sock >= 0) {
1106 ret = close(consumer_data->cmd_sock);
1107 if (ret) {
1108 PERROR("close");
1109 }
1110 }
1111 if (consumer_data->metadata_sock.fd >= 0) {
1112 ret = close(consumer_data->metadata_sock.fd);
1113 if (ret) {
1114 PERROR("close");
1115 }
1116 }
1117 /* Cleanup metadata socket mutex. */
1118 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1119 free(consumer_data->metadata_sock.lock);
1120
1121 if (sock >= 0) {
1122 ret = close(sock);
1123 if (ret) {
1124 PERROR("close");
1125 }
1126 }
1127
1128 unlink(consumer_data->err_unix_sock_path);
1129 unlink(consumer_data->cmd_unix_sock_path);
1130 consumer_data->pid = 0;
1131
1132 lttng_poll_clean(&events);
1133 error_poll:
1134 if (err) {
1135 health_error();
1136 ERR("Health error occurred in %s", __func__);
1137 }
1138 health_unregister();
1139 DBG("consumer thread cleanup completed");
1140
1141 return NULL;
1142 }
1143
1144 /*
1145 * This thread manage application communication.
1146 */
1147 static void *thread_manage_apps(void *data)
1148 {
1149 int i, ret, pollfd, err = -1;
1150 uint32_t revents, nb_fd;
1151 struct lttng_poll_event events;
1152
1153 DBG("[thread] Manage application started");
1154
1155 rcu_register_thread();
1156 rcu_thread_online();
1157
1158 health_register(HEALTH_TYPE_APP_MANAGE);
1159
1160 if (testpoint(thread_manage_apps)) {
1161 goto error_testpoint;
1162 }
1163
1164 health_code_update();
1165
1166 ret = sessiond_set_thread_pollset(&events, 2);
1167 if (ret < 0) {
1168 goto error_poll_create;
1169 }
1170
1171 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1172 if (ret < 0) {
1173 goto error;
1174 }
1175
1176 if (testpoint(thread_manage_apps_before_loop)) {
1177 goto error;
1178 }
1179
1180 health_code_update();
1181
1182 while (1) {
1183 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
1184
1185 /* Inifinite blocking call, waiting for transmission */
1186 restart:
1187 health_poll_entry();
1188 ret = lttng_poll_wait(&events, -1);
1189 health_poll_exit();
1190 if (ret < 0) {
1191 /*
1192 * Restart interrupted system call.
1193 */
1194 if (errno == EINTR) {
1195 goto restart;
1196 }
1197 goto error;
1198 }
1199
1200 nb_fd = ret;
1201
1202 for (i = 0; i < nb_fd; i++) {
1203 /* Fetch once the poll data */
1204 revents = LTTNG_POLL_GETEV(&events, i);
1205 pollfd = LTTNG_POLL_GETFD(&events, i);
1206
1207 health_code_update();
1208
1209 /* Thread quit pipe has been closed. Killing thread. */
1210 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1211 if (ret) {
1212 err = 0;
1213 goto exit;
1214 }
1215
1216 /* Inspect the apps cmd pipe */
1217 if (pollfd == apps_cmd_pipe[0]) {
1218 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1219 ERR("Apps command pipe error");
1220 goto error;
1221 } else if (revents & LPOLLIN) {
1222 int sock;
1223
1224 /* Empty pipe */
1225 do {
1226 ret = read(apps_cmd_pipe[0], &sock, sizeof(sock));
1227 } while (ret < 0 && errno == EINTR);
1228 if (ret < 0 || ret < sizeof(sock)) {
1229 PERROR("read apps cmd pipe");
1230 goto error;
1231 }
1232
1233 health_code_update();
1234
1235 /*
1236 * We only monitor the error events of the socket. This
1237 * thread does not handle any incoming data from UST
1238 * (POLLIN).
1239 */
1240 ret = lttng_poll_add(&events, sock,
1241 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1242 if (ret < 0) {
1243 goto error;
1244 }
1245
1246 /* Set socket timeout for both receiving and ending */
1247 (void) lttcomm_setsockopt_rcv_timeout(sock,
1248 app_socket_timeout);
1249 (void) lttcomm_setsockopt_snd_timeout(sock,
1250 app_socket_timeout);
1251
1252 DBG("Apps with sock %d added to poll set", sock);
1253
1254 health_code_update();
1255
1256 break;
1257 }
1258 } else {
1259 /*
1260 * At this point, we know that a registered application made
1261 * the event at poll_wait.
1262 */
1263 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1264 /* Removing from the poll set */
1265 ret = lttng_poll_del(&events, pollfd);
1266 if (ret < 0) {
1267 goto error;
1268 }
1269
1270 /* Socket closed on remote end. */
1271 ust_app_unregister(pollfd);
1272 break;
1273 }
1274 }
1275
1276 health_code_update();
1277 }
1278 }
1279
1280 exit:
1281 error:
1282 lttng_poll_clean(&events);
1283 error_poll_create:
1284 error_testpoint:
1285 utils_close_pipe(apps_cmd_pipe);
1286 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1287
1288 /*
1289 * We don't clean the UST app hash table here since already registered
1290 * applications can still be controlled so let them be until the session
1291 * daemon dies or the applications stop.
1292 */
1293
1294 if (err) {
1295 health_error();
1296 ERR("Health error occurred in %s", __func__);
1297 }
1298 health_unregister();
1299 DBG("Application communication apps thread cleanup complete");
1300 rcu_thread_offline();
1301 rcu_unregister_thread();
1302 return NULL;
1303 }
1304
1305 /*
1306 * Send a socket to a thread This is called from the dispatch UST registration
1307 * thread once all sockets are set for the application.
1308 *
1309 * On success, return 0 else a negative value being the errno message of the
1310 * write().
1311 */
1312 static int send_socket_to_thread(int fd, int sock)
1313 {
1314 int ret;
1315
1316 /* Sockets MUST be set or else this should not have been called. */
1317 assert(fd >= 0);
1318 assert(sock >= 0);
1319
1320 do {
1321 ret = write(fd, &sock, sizeof(sock));
1322 } while (ret < 0 && errno == EINTR);
1323 if (ret < 0 || ret != sizeof(sock)) {
1324 PERROR("write apps pipe %d", fd);
1325 if (ret < 0) {
1326 ret = -errno;
1327 }
1328 goto error;
1329 }
1330
1331 /* All good. Don't send back the write positive ret value. */
1332 ret = 0;
1333 error:
1334 return ret;
1335 }
1336
1337 /*
1338 * Sanitize the wait queue of the dispatch registration thread meaning removing
1339 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1340 * notify socket is never received.
1341 */
1342 static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1343 {
1344 int ret, nb_fd = 0, i;
1345 unsigned int fd_added = 0;
1346 struct lttng_poll_event events;
1347 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1348
1349 assert(wait_queue);
1350
1351 lttng_poll_init(&events);
1352
1353 /* Just skip everything for an empty queue. */
1354 if (!wait_queue->count) {
1355 goto end;
1356 }
1357
1358 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1359 if (ret < 0) {
1360 goto error_create;
1361 }
1362
1363 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1364 &wait_queue->head, head) {
1365 assert(wait_node->app);
1366 ret = lttng_poll_add(&events, wait_node->app->sock,
1367 LPOLLHUP | LPOLLERR);
1368 if (ret < 0) {
1369 goto error;
1370 }
1371
1372 fd_added = 1;
1373 }
1374
1375 if (!fd_added) {
1376 goto end;
1377 }
1378
1379 /*
1380 * Poll but don't block so we can quickly identify the faulty events and
1381 * clean them afterwards from the wait queue.
1382 */
1383 ret = lttng_poll_wait(&events, 0);
1384 if (ret < 0) {
1385 goto error;
1386 }
1387 nb_fd = ret;
1388
1389 for (i = 0; i < nb_fd; i++) {
1390 /* Get faulty FD. */
1391 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1392 int pollfd = LTTNG_POLL_GETFD(&events, i);
1393
1394 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1395 &wait_queue->head, head) {
1396 if (pollfd == wait_node->app->sock &&
1397 (revents & (LPOLLHUP | LPOLLERR))) {
1398 cds_list_del(&wait_node->head);
1399 wait_queue->count--;
1400 ust_app_destroy(wait_node->app);
1401 free(wait_node);
1402 break;
1403 }
1404 }
1405 }
1406
1407 if (nb_fd > 0) {
1408 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1409 }
1410
1411 end:
1412 lttng_poll_clean(&events);
1413 return;
1414
1415 error:
1416 lttng_poll_clean(&events);
1417 error_create:
1418 ERR("Unable to sanitize wait queue");
1419 return;
1420 }
1421
1422 /*
1423 * Dispatch request from the registration threads to the application
1424 * communication thread.
1425 */
1426 static void *thread_dispatch_ust_registration(void *data)
1427 {
1428 int ret, err = -1;
1429 struct cds_wfq_node *node;
1430 struct ust_command *ust_cmd = NULL;
1431 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1432 struct ust_reg_wait_queue wait_queue = {
1433 .count = 0,
1434 };
1435
1436 health_register(HEALTH_TYPE_APP_REG_DISPATCH);
1437
1438 health_code_update();
1439
1440 CDS_INIT_LIST_HEAD(&wait_queue.head);
1441
1442 DBG("[thread] Dispatch UST command started");
1443
1444 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
1445 health_code_update();
1446
1447 /* Atomically prepare the queue futex */
1448 futex_nto1_prepare(&ust_cmd_queue.futex);
1449
1450 do {
1451 struct ust_app *app = NULL;
1452 ust_cmd = NULL;
1453
1454 /*
1455 * Make sure we don't have node(s) that have hung up before receiving
1456 * the notify socket. This is to clean the list in order to avoid
1457 * memory leaks from notify socket that are never seen.
1458 */
1459 sanitize_wait_queue(&wait_queue);
1460
1461 health_code_update();
1462 /* Dequeue command for registration */
1463 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1464 if (node == NULL) {
1465 DBG("Woken up but nothing in the UST command queue");
1466 /* Continue thread execution */
1467 break;
1468 }
1469
1470 ust_cmd = caa_container_of(node, struct ust_command, node);
1471
1472 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1473 " gid:%d sock:%d name:%s (version %d.%d)",
1474 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1475 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1476 ust_cmd->sock, ust_cmd->reg_msg.name,
1477 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1478
1479 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1480 wait_node = zmalloc(sizeof(*wait_node));
1481 if (!wait_node) {
1482 PERROR("zmalloc wait_node dispatch");
1483 ret = close(ust_cmd->sock);
1484 if (ret < 0) {
1485 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1486 }
1487 lttng_fd_put(1, LTTNG_FD_APPS);
1488 free(ust_cmd);
1489 goto error;
1490 }
1491 CDS_INIT_LIST_HEAD(&wait_node->head);
1492
1493 /* Create application object if socket is CMD. */
1494 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1495 ust_cmd->sock);
1496 if (!wait_node->app) {
1497 ret = close(ust_cmd->sock);
1498 if (ret < 0) {
1499 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1500 }
1501 lttng_fd_put(1, LTTNG_FD_APPS);
1502 free(wait_node);
1503 free(ust_cmd);
1504 continue;
1505 }
1506 /*
1507 * Add application to the wait queue so we can set the notify
1508 * socket before putting this object in the global ht.
1509 */
1510 cds_list_add(&wait_node->head, &wait_queue.head);
1511 wait_queue.count++;
1512
1513 free(ust_cmd);
1514 /*
1515 * We have to continue here since we don't have the notify
1516 * socket and the application MUST be added to the hash table
1517 * only at that moment.
1518 */
1519 continue;
1520 } else {
1521 /*
1522 * Look for the application in the local wait queue and set the
1523 * notify socket if found.
1524 */
1525 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1526 &wait_queue.head, head) {
1527 health_code_update();
1528 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1529 wait_node->app->notify_sock = ust_cmd->sock;
1530 cds_list_del(&wait_node->head);
1531 wait_queue.count--;
1532 app = wait_node->app;
1533 free(wait_node);
1534 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1535 break;
1536 }
1537 }
1538
1539 /*
1540 * With no application at this stage the received socket is
1541 * basically useless so close it before we free the cmd data
1542 * structure for good.
1543 */
1544 if (!app) {
1545 ret = close(ust_cmd->sock);
1546 if (ret < 0) {
1547 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1548 }
1549 lttng_fd_put(1, LTTNG_FD_APPS);
1550 }
1551 free(ust_cmd);
1552 }
1553
1554 if (app) {
1555 /*
1556 * @session_lock_list
1557 *
1558 * Lock the global session list so from the register up to the
1559 * registration done message, no thread can see the application
1560 * and change its state.
1561 */
1562 session_lock_list();
1563 rcu_read_lock();
1564
1565 /*
1566 * Add application to the global hash table. This needs to be
1567 * done before the update to the UST registry can locate the
1568 * application.
1569 */
1570 ust_app_add(app);
1571
1572 /* Set app version. This call will print an error if needed. */
1573 (void) ust_app_version(app);
1574
1575 /* Send notify socket through the notify pipe. */
1576 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1577 app->notify_sock);
1578 if (ret < 0) {
1579 rcu_read_unlock();
1580 session_unlock_list();
1581 /* No notify thread, stop the UST tracing. */
1582 goto error;
1583 }
1584
1585 /*
1586 * Update newly registered application with the tracing
1587 * registry info already enabled information.
1588 */
1589 update_ust_app(app->sock);
1590
1591 /*
1592 * Don't care about return value. Let the manage apps threads
1593 * handle app unregistration upon socket close.
1594 */
1595 (void) ust_app_register_done(app->sock);
1596
1597 /*
1598 * Even if the application socket has been closed, send the app
1599 * to the thread and unregistration will take place at that
1600 * place.
1601 */
1602 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
1603 if (ret < 0) {
1604 rcu_read_unlock();
1605 session_unlock_list();
1606 /* No apps. thread, stop the UST tracing. */
1607 goto error;
1608 }
1609
1610 rcu_read_unlock();
1611 session_unlock_list();
1612 }
1613 } while (node != NULL);
1614
1615 health_poll_entry();
1616 /* Futex wait on queue. Blocking call on futex() */
1617 futex_nto1_wait(&ust_cmd_queue.futex);
1618 health_poll_exit();
1619 }
1620 /* Normal exit, no error */
1621 err = 0;
1622
1623 error:
1624 /* Clean up wait queue. */
1625 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1626 &wait_queue.head, head) {
1627 cds_list_del(&wait_node->head);
1628 wait_queue.count--;
1629 free(wait_node);
1630 }
1631
1632 DBG("Dispatch thread dying");
1633 if (err) {
1634 health_error();
1635 ERR("Health error occurred in %s", __func__);
1636 }
1637 health_unregister();
1638 return NULL;
1639 }
1640
1641 /*
1642 * This thread manage application registration.
1643 */
1644 static void *thread_registration_apps(void *data)
1645 {
1646 int sock = -1, i, ret, pollfd, err = -1;
1647 uint32_t revents, nb_fd;
1648 struct lttng_poll_event events;
1649 /*
1650 * Get allocated in this thread, enqueued to a global queue, dequeued and
1651 * freed in the manage apps thread.
1652 */
1653 struct ust_command *ust_cmd = NULL;
1654
1655 DBG("[thread] Manage application registration started");
1656
1657 health_register(HEALTH_TYPE_APP_REG);
1658
1659 if (testpoint(thread_registration_apps)) {
1660 goto error_testpoint;
1661 }
1662
1663 ret = lttcomm_listen_unix_sock(apps_sock);
1664 if (ret < 0) {
1665 goto error_listen;
1666 }
1667
1668 /*
1669 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1670 * more will be added to this poll set.
1671 */
1672 ret = sessiond_set_thread_pollset(&events, 2);
1673 if (ret < 0) {
1674 goto error_create_poll;
1675 }
1676
1677 /* Add the application registration socket */
1678 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1679 if (ret < 0) {
1680 goto error_poll_add;
1681 }
1682
1683 /* Notify all applications to register */
1684 ret = notify_ust_apps(1);
1685 if (ret < 0) {
1686 ERR("Failed to notify applications or create the wait shared memory.\n"
1687 "Execution continues but there might be problem for already\n"
1688 "running applications that wishes to register.");
1689 }
1690
1691 while (1) {
1692 DBG("Accepting application registration");
1693
1694 /* Inifinite blocking call, waiting for transmission */
1695 restart:
1696 health_poll_entry();
1697 ret = lttng_poll_wait(&events, -1);
1698 health_poll_exit();
1699 if (ret < 0) {
1700 /*
1701 * Restart interrupted system call.
1702 */
1703 if (errno == EINTR) {
1704 goto restart;
1705 }
1706 goto error;
1707 }
1708
1709 nb_fd = ret;
1710
1711 for (i = 0; i < nb_fd; i++) {
1712 health_code_update();
1713
1714 /* Fetch once the poll data */
1715 revents = LTTNG_POLL_GETEV(&events, i);
1716 pollfd = LTTNG_POLL_GETFD(&events, i);
1717
1718 /* Thread quit pipe has been closed. Killing thread. */
1719 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1720 if (ret) {
1721 err = 0;
1722 goto exit;
1723 }
1724
1725 /* Event on the registration socket */
1726 if (pollfd == apps_sock) {
1727 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1728 ERR("Register apps socket poll error");
1729 goto error;
1730 } else if (revents & LPOLLIN) {
1731 sock = lttcomm_accept_unix_sock(apps_sock);
1732 if (sock < 0) {
1733 goto error;
1734 }
1735
1736 /*
1737 * Set the CLOEXEC flag. Return code is useless because
1738 * either way, the show must go on.
1739 */
1740 (void) utils_set_fd_cloexec(sock);
1741
1742 /* Create UST registration command for enqueuing */
1743 ust_cmd = zmalloc(sizeof(struct ust_command));
1744 if (ust_cmd == NULL) {
1745 PERROR("ust command zmalloc");
1746 goto error;
1747 }
1748
1749 /*
1750 * Using message-based transmissions to ensure we don't
1751 * have to deal with partially received messages.
1752 */
1753 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1754 if (ret < 0) {
1755 ERR("Exhausted file descriptors allowed for applications.");
1756 free(ust_cmd);
1757 ret = close(sock);
1758 if (ret) {
1759 PERROR("close");
1760 }
1761 sock = -1;
1762 continue;
1763 }
1764
1765 health_code_update();
1766 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
1767 if (ret < 0) {
1768 free(ust_cmd);
1769 /* Close socket of the application. */
1770 ret = close(sock);
1771 if (ret) {
1772 PERROR("close");
1773 }
1774 lttng_fd_put(LTTNG_FD_APPS, 1);
1775 sock = -1;
1776 continue;
1777 }
1778 health_code_update();
1779
1780 ust_cmd->sock = sock;
1781 sock = -1;
1782
1783 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1784 " gid:%d sock:%d name:%s (version %d.%d)",
1785 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1786 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1787 ust_cmd->sock, ust_cmd->reg_msg.name,
1788 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1789
1790 /*
1791 * Lock free enqueue the registration request. The red pill
1792 * has been taken! This apps will be part of the *system*.
1793 */
1794 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1795
1796 /*
1797 * Wake the registration queue futex. Implicit memory
1798 * barrier with the exchange in cds_wfq_enqueue.
1799 */
1800 futex_nto1_wake(&ust_cmd_queue.futex);
1801 }
1802 }
1803 }
1804 }
1805
1806 exit:
1807 error:
1808 if (err) {
1809 health_error();
1810 ERR("Health error occurred in %s", __func__);
1811 }
1812
1813 /* Notify that the registration thread is gone */
1814 notify_ust_apps(0);
1815
1816 if (apps_sock >= 0) {
1817 ret = close(apps_sock);
1818 if (ret) {
1819 PERROR("close");
1820 }
1821 }
1822 if (sock >= 0) {
1823 ret = close(sock);
1824 if (ret) {
1825 PERROR("close");
1826 }
1827 lttng_fd_put(LTTNG_FD_APPS, 1);
1828 }
1829 unlink(apps_unix_sock_path);
1830
1831 error_poll_add:
1832 lttng_poll_clean(&events);
1833 error_listen:
1834 error_create_poll:
1835 error_testpoint:
1836 DBG("UST Registration thread cleanup complete");
1837 health_unregister();
1838
1839 return NULL;
1840 }
1841
1842 /*
1843 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1844 * exec or it will fails.
1845 */
1846 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1847 {
1848 int ret, clock_ret;
1849 struct timespec timeout;
1850
1851 /* Make sure we set the readiness flag to 0 because we are NOT ready */
1852 consumer_data->consumer_thread_is_ready = 0;
1853
1854 /* Setup pthread condition */
1855 ret = pthread_condattr_init(&consumer_data->condattr);
1856 if (ret != 0) {
1857 errno = ret;
1858 PERROR("pthread_condattr_init consumer data");
1859 goto error;
1860 }
1861
1862 /*
1863 * Set the monotonic clock in order to make sure we DO NOT jump in time
1864 * between the clock_gettime() call and the timedwait call. See bug #324
1865 * for a more details and how we noticed it.
1866 */
1867 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
1868 if (ret != 0) {
1869 errno = ret;
1870 PERROR("pthread_condattr_setclock consumer data");
1871 goto error;
1872 }
1873
1874 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
1875 if (ret != 0) {
1876 errno = ret;
1877 PERROR("pthread_cond_init consumer data");
1878 goto error;
1879 }
1880
1881 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
1882 consumer_data);
1883 if (ret != 0) {
1884 PERROR("pthread_create consumer");
1885 ret = -1;
1886 goto error;
1887 }
1888
1889 /* We are about to wait on a pthread condition */
1890 pthread_mutex_lock(&consumer_data->cond_mutex);
1891
1892 /* Get time for sem_timedwait absolute timeout */
1893 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
1894 /*
1895 * Set the timeout for the condition timed wait even if the clock gettime
1896 * call fails since we might loop on that call and we want to avoid to
1897 * increment the timeout too many times.
1898 */
1899 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1900
1901 /*
1902 * The following loop COULD be skipped in some conditions so this is why we
1903 * set ret to 0 in order to make sure at least one round of the loop is
1904 * done.
1905 */
1906 ret = 0;
1907
1908 /*
1909 * Loop until the condition is reached or when a timeout is reached. Note
1910 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
1911 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
1912 * possible. This loop does not take any chances and works with both of
1913 * them.
1914 */
1915 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
1916 if (clock_ret < 0) {
1917 PERROR("clock_gettime spawn consumer");
1918 /* Infinite wait for the consumerd thread to be ready */
1919 ret = pthread_cond_wait(&consumer_data->cond,
1920 &consumer_data->cond_mutex);
1921 } else {
1922 ret = pthread_cond_timedwait(&consumer_data->cond,
1923 &consumer_data->cond_mutex, &timeout);
1924 }
1925 }
1926
1927 /* Release the pthread condition */
1928 pthread_mutex_unlock(&consumer_data->cond_mutex);
1929
1930 if (ret != 0) {
1931 errno = ret;
1932 if (ret == ETIMEDOUT) {
1933 /*
1934 * Call has timed out so we kill the kconsumerd_thread and return
1935 * an error.
1936 */
1937 ERR("Condition timed out. The consumer thread was never ready."
1938 " Killing it");
1939 ret = pthread_cancel(consumer_data->thread);
1940 if (ret < 0) {
1941 PERROR("pthread_cancel consumer thread");
1942 }
1943 } else {
1944 PERROR("pthread_cond_wait failed consumer thread");
1945 }
1946 goto error;
1947 }
1948
1949 pthread_mutex_lock(&consumer_data->pid_mutex);
1950 if (consumer_data->pid == 0) {
1951 ERR("Consumerd did not start");
1952 pthread_mutex_unlock(&consumer_data->pid_mutex);
1953 goto error;
1954 }
1955 pthread_mutex_unlock(&consumer_data->pid_mutex);
1956
1957 return 0;
1958
1959 error:
1960 return ret;
1961 }
1962
1963 /*
1964 * Join consumer thread
1965 */
1966 static int join_consumer_thread(struct consumer_data *consumer_data)
1967 {
1968 void *status;
1969
1970 /* Consumer pid must be a real one. */
1971 if (consumer_data->pid > 0) {
1972 int ret;
1973 ret = kill(consumer_data->pid, SIGTERM);
1974 if (ret) {
1975 ERR("Error killing consumer daemon");
1976 return ret;
1977 }
1978 return pthread_join(consumer_data->thread, &status);
1979 } else {
1980 return 0;
1981 }
1982 }
1983
1984 /*
1985 * Fork and exec a consumer daemon (consumerd).
1986 *
1987 * Return pid if successful else -1.
1988 */
1989 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1990 {
1991 int ret;
1992 pid_t pid;
1993 const char *consumer_to_use;
1994 const char *verbosity;
1995 struct stat st;
1996
1997 DBG("Spawning consumerd");
1998
1999 pid = fork();
2000 if (pid == 0) {
2001 /*
2002 * Exec consumerd.
2003 */
2004 if (opt_verbose_consumer) {
2005 verbosity = "--verbose";
2006 } else {
2007 verbosity = "--quiet";
2008 }
2009 switch (consumer_data->type) {
2010 case LTTNG_CONSUMER_KERNEL:
2011 /*
2012 * Find out which consumerd to execute. We will first try the
2013 * 64-bit path, then the sessiond's installation directory, and
2014 * fallback on the 32-bit one,
2015 */
2016 DBG3("Looking for a kernel consumer at these locations:");
2017 DBG3(" 1) %s", consumerd64_bin);
2018 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
2019 DBG3(" 3) %s", consumerd32_bin);
2020 if (stat(consumerd64_bin, &st) == 0) {
2021 DBG3("Found location #1");
2022 consumer_to_use = consumerd64_bin;
2023 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
2024 DBG3("Found location #2");
2025 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
2026 } else if (stat(consumerd32_bin, &st) == 0) {
2027 DBG3("Found location #3");
2028 consumer_to_use = consumerd32_bin;
2029 } else {
2030 DBG("Could not find any valid consumerd executable");
2031 break;
2032 }
2033 DBG("Using kernel consumer at: %s", consumer_to_use);
2034 execl(consumer_to_use,
2035 "lttng-consumerd", verbosity, "-k",
2036 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2037 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2038 NULL);
2039 break;
2040 case LTTNG_CONSUMER64_UST:
2041 {
2042 char *tmpnew = NULL;
2043
2044 if (consumerd64_libdir[0] != '\0') {
2045 char *tmp;
2046 size_t tmplen;
2047
2048 tmp = getenv("LD_LIBRARY_PATH");
2049 if (!tmp) {
2050 tmp = "";
2051 }
2052 tmplen = strlen("LD_LIBRARY_PATH=")
2053 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
2054 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2055 if (!tmpnew) {
2056 ret = -ENOMEM;
2057 goto error;
2058 }
2059 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2060 strcat(tmpnew, consumerd64_libdir);
2061 if (tmp[0] != '\0') {
2062 strcat(tmpnew, ":");
2063 strcat(tmpnew, tmp);
2064 }
2065 ret = putenv(tmpnew);
2066 if (ret) {
2067 ret = -errno;
2068 free(tmpnew);
2069 goto error;
2070 }
2071 }
2072 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
2073 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
2074 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2075 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2076 NULL);
2077 if (consumerd64_libdir[0] != '\0') {
2078 free(tmpnew);
2079 }
2080 if (ret) {
2081 goto error;
2082 }
2083 break;
2084 }
2085 case LTTNG_CONSUMER32_UST:
2086 {
2087 char *tmpnew = NULL;
2088
2089 if (consumerd32_libdir[0] != '\0') {
2090 char *tmp;
2091 size_t tmplen;
2092
2093 tmp = getenv("LD_LIBRARY_PATH");
2094 if (!tmp) {
2095 tmp = "";
2096 }
2097 tmplen = strlen("LD_LIBRARY_PATH=")
2098 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
2099 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2100 if (!tmpnew) {
2101 ret = -ENOMEM;
2102 goto error;
2103 }
2104 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2105 strcat(tmpnew, consumerd32_libdir);
2106 if (tmp[0] != '\0') {
2107 strcat(tmpnew, ":");
2108 strcat(tmpnew, tmp);
2109 }
2110 ret = putenv(tmpnew);
2111 if (ret) {
2112 ret = -errno;
2113 free(tmpnew);
2114 goto error;
2115 }
2116 }
2117 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
2118 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
2119 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2120 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2121 NULL);
2122 if (consumerd32_libdir[0] != '\0') {
2123 free(tmpnew);
2124 }
2125 if (ret) {
2126 goto error;
2127 }
2128 break;
2129 }
2130 default:
2131 PERROR("unknown consumer type");
2132 exit(EXIT_FAILURE);
2133 }
2134 if (errno != 0) {
2135 PERROR("kernel start consumer exec");
2136 }
2137 exit(EXIT_FAILURE);
2138 } else if (pid > 0) {
2139 ret = pid;
2140 } else {
2141 PERROR("start consumer fork");
2142 ret = -errno;
2143 }
2144 error:
2145 return ret;
2146 }
2147
2148 /*
2149 * Spawn the consumerd daemon and session daemon thread.
2150 */
2151 static int start_consumerd(struct consumer_data *consumer_data)
2152 {
2153 int ret;
2154
2155 /*
2156 * Set the listen() state on the socket since there is a possible race
2157 * between the exec() of the consumer daemon and this call if place in the
2158 * consumer thread. See bug #366 for more details.
2159 */
2160 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2161 if (ret < 0) {
2162 goto error;
2163 }
2164
2165 pthread_mutex_lock(&consumer_data->pid_mutex);
2166 if (consumer_data->pid != 0) {
2167 pthread_mutex_unlock(&consumer_data->pid_mutex);
2168 goto end;
2169 }
2170
2171 ret = spawn_consumerd(consumer_data);
2172 if (ret < 0) {
2173 ERR("Spawning consumerd failed");
2174 pthread_mutex_unlock(&consumer_data->pid_mutex);
2175 goto error;
2176 }
2177
2178 /* Setting up the consumer_data pid */
2179 consumer_data->pid = ret;
2180 DBG2("Consumer pid %d", consumer_data->pid);
2181 pthread_mutex_unlock(&consumer_data->pid_mutex);
2182
2183 DBG2("Spawning consumer control thread");
2184 ret = spawn_consumer_thread(consumer_data);
2185 if (ret < 0) {
2186 ERR("Fatal error spawning consumer control thread");
2187 goto error;
2188 }
2189
2190 end:
2191 return 0;
2192
2193 error:
2194 /* Cleanup already created sockets on error. */
2195 if (consumer_data->err_sock >= 0) {
2196 int err;
2197
2198 err = close(consumer_data->err_sock);
2199 if (err < 0) {
2200 PERROR("close consumer data error socket");
2201 }
2202 }
2203 return ret;
2204 }
2205
2206 /*
2207 * Compute health status of each consumer. If one of them is zero (bad
2208 * state), we return 0.
2209 */
2210 static int check_consumer_health(void)
2211 {
2212 int ret;
2213
2214 ret = health_check_state(HEALTH_TYPE_CONSUMER);
2215
2216 DBG3("Health consumer check %d", ret);
2217
2218 return ret;
2219 }
2220
2221 /*
2222 * Setup necessary data for kernel tracer action.
2223 */
2224 static int init_kernel_tracer(void)
2225 {
2226 int ret;
2227
2228 /* Modprobe lttng kernel modules */
2229 ret = modprobe_lttng_control();
2230 if (ret < 0) {
2231 goto error;
2232 }
2233
2234 /* Open debugfs lttng */
2235 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2236 if (kernel_tracer_fd < 0) {
2237 DBG("Failed to open %s", module_proc_lttng);
2238 ret = -1;
2239 goto error_open;
2240 }
2241
2242 /* Validate kernel version */
2243 ret = kernel_validate_version(kernel_tracer_fd);
2244 if (ret < 0) {
2245 goto error_version;
2246 }
2247
2248 ret = modprobe_lttng_data();
2249 if (ret < 0) {
2250 goto error_modules;
2251 }
2252
2253 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2254 return 0;
2255
2256 error_version:
2257 modprobe_remove_lttng_control();
2258 ret = close(kernel_tracer_fd);
2259 if (ret) {
2260 PERROR("close");
2261 }
2262 kernel_tracer_fd = -1;
2263 return LTTNG_ERR_KERN_VERSION;
2264
2265 error_modules:
2266 ret = close(kernel_tracer_fd);
2267 if (ret) {
2268 PERROR("close");
2269 }
2270
2271 error_open:
2272 modprobe_remove_lttng_control();
2273
2274 error:
2275 WARN("No kernel tracer available");
2276 kernel_tracer_fd = -1;
2277 if (!is_root) {
2278 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2279 } else {
2280 return LTTNG_ERR_KERN_NA;
2281 }
2282 }
2283
2284
2285 /*
2286 * Copy consumer output from the tracing session to the domain session. The
2287 * function also applies the right modification on a per domain basis for the
2288 * trace files destination directory.
2289 *
2290 * Should *NOT* be called with RCU read-side lock held.
2291 */
2292 static int copy_session_consumer(int domain, struct ltt_session *session)
2293 {
2294 int ret;
2295 const char *dir_name;
2296 struct consumer_output *consumer;
2297
2298 assert(session);
2299 assert(session->consumer);
2300
2301 switch (domain) {
2302 case LTTNG_DOMAIN_KERNEL:
2303 DBG3("Copying tracing session consumer output in kernel session");
2304 /*
2305 * XXX: We should audit the session creation and what this function
2306 * does "extra" in order to avoid a destroy since this function is used
2307 * in the domain session creation (kernel and ust) only. Same for UST
2308 * domain.
2309 */
2310 if (session->kernel_session->consumer) {
2311 consumer_destroy_output(session->kernel_session->consumer);
2312 }
2313 session->kernel_session->consumer =
2314 consumer_copy_output(session->consumer);
2315 /* Ease our life a bit for the next part */
2316 consumer = session->kernel_session->consumer;
2317 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2318 break;
2319 case LTTNG_DOMAIN_UST:
2320 DBG3("Copying tracing session consumer output in UST session");
2321 if (session->ust_session->consumer) {
2322 consumer_destroy_output(session->ust_session->consumer);
2323 }
2324 session->ust_session->consumer =
2325 consumer_copy_output(session->consumer);
2326 /* Ease our life a bit for the next part */
2327 consumer = session->ust_session->consumer;
2328 dir_name = DEFAULT_UST_TRACE_DIR;
2329 break;
2330 default:
2331 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2332 goto error;
2333 }
2334
2335 /* Append correct directory to subdir */
2336 strncat(consumer->subdir, dir_name,
2337 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2338 DBG3("Copy session consumer subdir %s", consumer->subdir);
2339
2340 ret = LTTNG_OK;
2341
2342 error:
2343 return ret;
2344 }
2345
2346 /*
2347 * Create an UST session and add it to the session ust list.
2348 *
2349 * Should *NOT* be called with RCU read-side lock held.
2350 */
2351 static int create_ust_session(struct ltt_session *session,
2352 struct lttng_domain *domain)
2353 {
2354 int ret;
2355 struct ltt_ust_session *lus = NULL;
2356
2357 assert(session);
2358 assert(domain);
2359 assert(session->consumer);
2360
2361 switch (domain->type) {
2362 case LTTNG_DOMAIN_UST:
2363 break;
2364 default:
2365 ERR("Unknown UST domain on create session %d", domain->type);
2366 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2367 goto error;
2368 }
2369
2370 DBG("Creating UST session");
2371
2372 lus = trace_ust_create_session(session->id);
2373 if (lus == NULL) {
2374 ret = LTTNG_ERR_UST_SESS_FAIL;
2375 goto error;
2376 }
2377
2378 lus->uid = session->uid;
2379 lus->gid = session->gid;
2380 session->ust_session = lus;
2381
2382 /* Copy session output to the newly created UST session */
2383 ret = copy_session_consumer(domain->type, session);
2384 if (ret != LTTNG_OK) {
2385 goto error;
2386 }
2387
2388 return LTTNG_OK;
2389
2390 error:
2391 free(lus);
2392 session->ust_session = NULL;
2393 return ret;
2394 }
2395
2396 /*
2397 * Create a kernel tracer session then create the default channel.
2398 */
2399 static int create_kernel_session(struct ltt_session *session)
2400 {
2401 int ret;
2402
2403 DBG("Creating kernel session");
2404
2405 ret = kernel_create_session(session, kernel_tracer_fd);
2406 if (ret < 0) {
2407 ret = LTTNG_ERR_KERN_SESS_FAIL;
2408 goto error;
2409 }
2410
2411 /* Code flow safety */
2412 assert(session->kernel_session);
2413
2414 /* Copy session output to the newly created Kernel session */
2415 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2416 if (ret != LTTNG_OK) {
2417 goto error;
2418 }
2419
2420 /* Create directory(ies) on local filesystem. */
2421 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2422 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2423 ret = run_as_mkdir_recursive(
2424 session->kernel_session->consumer->dst.trace_path,
2425 S_IRWXU | S_IRWXG, session->uid, session->gid);
2426 if (ret < 0) {
2427 if (ret != -EEXIST) {
2428 ERR("Trace directory creation error");
2429 goto error;
2430 }
2431 }
2432 }
2433
2434 session->kernel_session->uid = session->uid;
2435 session->kernel_session->gid = session->gid;
2436
2437 return LTTNG_OK;
2438
2439 error:
2440 trace_kernel_destroy_session(session->kernel_session);
2441 session->kernel_session = NULL;
2442 return ret;
2443 }
2444
2445 /*
2446 * Count number of session permitted by uid/gid.
2447 */
2448 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2449 {
2450 unsigned int i = 0;
2451 struct ltt_session *session;
2452
2453 DBG("Counting number of available session for UID %d GID %d",
2454 uid, gid);
2455 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2456 /*
2457 * Only list the sessions the user can control.
2458 */
2459 if (!session_access_ok(session, uid, gid)) {
2460 continue;
2461 }
2462 i++;
2463 }
2464 return i;
2465 }
2466
2467 /*
2468 * Process the command requested by the lttng client within the command
2469 * context structure. This function make sure that the return structure (llm)
2470 * is set and ready for transmission before returning.
2471 *
2472 * Return any error encountered or 0 for success.
2473 *
2474 * "sock" is only used for special-case var. len data.
2475 *
2476 * Should *NOT* be called with RCU read-side lock held.
2477 */
2478 static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2479 int *sock_error)
2480 {
2481 int ret = LTTNG_OK;
2482 int need_tracing_session = 1;
2483 int need_domain;
2484
2485 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2486
2487 *sock_error = 0;
2488
2489 switch (cmd_ctx->lsm->cmd_type) {
2490 case LTTNG_CREATE_SESSION:
2491 case LTTNG_DESTROY_SESSION:
2492 case LTTNG_LIST_SESSIONS:
2493 case LTTNG_LIST_DOMAINS:
2494 case LTTNG_START_TRACE:
2495 case LTTNG_STOP_TRACE:
2496 case LTTNG_DATA_PENDING:
2497 need_domain = 0;
2498 break;
2499 default:
2500 need_domain = 1;
2501 }
2502
2503 if (opt_no_kernel && need_domain
2504 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
2505 if (!is_root) {
2506 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2507 } else {
2508 ret = LTTNG_ERR_KERN_NA;
2509 }
2510 goto error;
2511 }
2512
2513 /* Deny register consumer if we already have a spawned consumer. */
2514 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2515 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2516 if (kconsumer_data.pid > 0) {
2517 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2518 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2519 goto error;
2520 }
2521 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2522 }
2523
2524 /*
2525 * Check for command that don't needs to allocate a returned payload. We do
2526 * this here so we don't have to make the call for no payload at each
2527 * command.
2528 */
2529 switch(cmd_ctx->lsm->cmd_type) {
2530 case LTTNG_LIST_SESSIONS:
2531 case LTTNG_LIST_TRACEPOINTS:
2532 case LTTNG_LIST_TRACEPOINT_FIELDS:
2533 case LTTNG_LIST_DOMAINS:
2534 case LTTNG_LIST_CHANNELS:
2535 case LTTNG_LIST_EVENTS:
2536 break;
2537 default:
2538 /* Setup lttng message with no payload */
2539 ret = setup_lttng_msg(cmd_ctx, 0);
2540 if (ret < 0) {
2541 /* This label does not try to unlock the session */
2542 goto init_setup_error;
2543 }
2544 }
2545
2546 /* Commands that DO NOT need a session. */
2547 switch (cmd_ctx->lsm->cmd_type) {
2548 case LTTNG_CREATE_SESSION:
2549 case LTTNG_CALIBRATE:
2550 case LTTNG_LIST_SESSIONS:
2551 case LTTNG_LIST_TRACEPOINTS:
2552 case LTTNG_LIST_TRACEPOINT_FIELDS:
2553 need_tracing_session = 0;
2554 break;
2555 default:
2556 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2557 /*
2558 * We keep the session list lock across _all_ commands
2559 * for now, because the per-session lock does not
2560 * handle teardown properly.
2561 */
2562 session_lock_list();
2563 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2564 if (cmd_ctx->session == NULL) {
2565 ret = LTTNG_ERR_SESS_NOT_FOUND;
2566 goto error;
2567 } else {
2568 /* Acquire lock for the session */
2569 session_lock(cmd_ctx->session);
2570 }
2571 break;
2572 }
2573
2574 if (!need_domain) {
2575 goto skip_domain;
2576 }
2577
2578 /*
2579 * Check domain type for specific "pre-action".
2580 */
2581 switch (cmd_ctx->lsm->domain.type) {
2582 case LTTNG_DOMAIN_KERNEL:
2583 if (!is_root) {
2584 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2585 goto error;
2586 }
2587
2588 /* Kernel tracer check */
2589 if (kernel_tracer_fd == -1) {
2590 /* Basically, load kernel tracer modules */
2591 ret = init_kernel_tracer();
2592 if (ret != 0) {
2593 goto error;
2594 }
2595 }
2596
2597 /* Consumer is in an ERROR state. Report back to client */
2598 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
2599 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2600 goto error;
2601 }
2602
2603 /* Need a session for kernel command */
2604 if (need_tracing_session) {
2605 if (cmd_ctx->session->kernel_session == NULL) {
2606 ret = create_kernel_session(cmd_ctx->session);
2607 if (ret < 0) {
2608 ret = LTTNG_ERR_KERN_SESS_FAIL;
2609 goto error;
2610 }
2611 }
2612
2613 /* Start the kernel consumer daemon */
2614 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2615 if (kconsumer_data.pid == 0 &&
2616 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2617 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2618 ret = start_consumerd(&kconsumer_data);
2619 if (ret < 0) {
2620 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2621 goto error;
2622 }
2623 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
2624 } else {
2625 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2626 }
2627
2628 /*
2629 * The consumer was just spawned so we need to add the socket to
2630 * the consumer output of the session if exist.
2631 */
2632 ret = consumer_create_socket(&kconsumer_data,
2633 cmd_ctx->session->kernel_session->consumer);
2634 if (ret < 0) {
2635 goto error;
2636 }
2637 }
2638
2639 break;
2640 case LTTNG_DOMAIN_UST:
2641 {
2642 /* Consumer is in an ERROR state. Report back to client */
2643 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
2644 ret = LTTNG_ERR_NO_USTCONSUMERD;
2645 goto error;
2646 }
2647
2648 if (need_tracing_session) {
2649 /* Create UST session if none exist. */
2650 if (cmd_ctx->session->ust_session == NULL) {
2651 ret = create_ust_session(cmd_ctx->session,
2652 &cmd_ctx->lsm->domain);
2653 if (ret != LTTNG_OK) {
2654 goto error;
2655 }
2656 }
2657
2658 /* Start the UST consumer daemons */
2659 /* 64-bit */
2660 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
2661 if (consumerd64_bin[0] != '\0' &&
2662 ustconsumer64_data.pid == 0 &&
2663 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2664 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2665 ret = start_consumerd(&ustconsumer64_data);
2666 if (ret < 0) {
2667 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
2668 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2669 goto error;
2670 }
2671
2672 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
2673 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2674 } else {
2675 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2676 }
2677
2678 /*
2679 * Setup socket for consumer 64 bit. No need for atomic access
2680 * since it was set above and can ONLY be set in this thread.
2681 */
2682 ret = consumer_create_socket(&ustconsumer64_data,
2683 cmd_ctx->session->ust_session->consumer);
2684 if (ret < 0) {
2685 goto error;
2686 }
2687
2688 /* 32-bit */
2689 if (consumerd32_bin[0] != '\0' &&
2690 ustconsumer32_data.pid == 0 &&
2691 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2692 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2693 ret = start_consumerd(&ustconsumer32_data);
2694 if (ret < 0) {
2695 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
2696 uatomic_set(&ust_consumerd32_fd, -EINVAL);
2697 goto error;
2698 }
2699
2700 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
2701 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2702 } else {
2703 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2704 }
2705
2706 /*
2707 * Setup socket for consumer 64 bit. No need for atomic access
2708 * since it was set above and can ONLY be set in this thread.
2709 */
2710 ret = consumer_create_socket(&ustconsumer32_data,
2711 cmd_ctx->session->ust_session->consumer);
2712 if (ret < 0) {
2713 goto error;
2714 }
2715 }
2716 break;
2717 }
2718 default:
2719 break;
2720 }
2721 skip_domain:
2722
2723 /* Validate consumer daemon state when start/stop trace command */
2724 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2725 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2726 switch (cmd_ctx->lsm->domain.type) {
2727 case LTTNG_DOMAIN_UST:
2728 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
2729 ret = LTTNG_ERR_NO_USTCONSUMERD;
2730 goto error;
2731 }
2732 break;
2733 case LTTNG_DOMAIN_KERNEL:
2734 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
2735 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2736 goto error;
2737 }
2738 break;
2739 }
2740 }
2741
2742 /*
2743 * Check that the UID or GID match that of the tracing session.
2744 * The root user can interact with all sessions.
2745 */
2746 if (need_tracing_session) {
2747 if (!session_access_ok(cmd_ctx->session,
2748 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2749 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
2750 ret = LTTNG_ERR_EPERM;
2751 goto error;
2752 }
2753 }
2754
2755 /*
2756 * Send relayd information to consumer as soon as we have a domain and a
2757 * session defined.
2758 */
2759 if (cmd_ctx->session && need_domain) {
2760 /*
2761 * Setup relayd if not done yet. If the relayd information was already
2762 * sent to the consumer, this call will gracefully return.
2763 */
2764 ret = cmd_setup_relayd(cmd_ctx->session);
2765 if (ret != LTTNG_OK) {
2766 goto error;
2767 }
2768 }
2769
2770 /* Process by command type */
2771 switch (cmd_ctx->lsm->cmd_type) {
2772 case LTTNG_ADD_CONTEXT:
2773 {
2774 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2775 cmd_ctx->lsm->u.context.channel_name,
2776 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
2777 break;
2778 }
2779 case LTTNG_DISABLE_CHANNEL:
2780 {
2781 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2782 cmd_ctx->lsm->u.disable.channel_name);
2783 break;
2784 }
2785 case LTTNG_DISABLE_EVENT:
2786 {
2787 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2788 cmd_ctx->lsm->u.disable.channel_name,
2789 cmd_ctx->lsm->u.disable.name);
2790 break;
2791 }
2792 case LTTNG_DISABLE_ALL_EVENT:
2793 {
2794 DBG("Disabling all events");
2795
2796 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2797 cmd_ctx->lsm->u.disable.channel_name);
2798 break;
2799 }
2800 case LTTNG_ENABLE_CHANNEL:
2801 {
2802 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
2803 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
2804 break;
2805 }
2806 case LTTNG_ENABLE_EVENT:
2807 {
2808 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
2809 cmd_ctx->lsm->u.enable.channel_name,
2810 &cmd_ctx->lsm->u.enable.event, NULL, kernel_poll_pipe[1]);
2811 break;
2812 }
2813 case LTTNG_ENABLE_ALL_EVENT:
2814 {
2815 DBG("Enabling all events");
2816
2817 ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain,
2818 cmd_ctx->lsm->u.enable.channel_name,
2819 cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]);
2820 break;
2821 }
2822 case LTTNG_LIST_TRACEPOINTS:
2823 {
2824 struct lttng_event *events;
2825 ssize_t nb_events;
2826
2827 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
2828 if (nb_events < 0) {
2829 /* Return value is a negative lttng_error_code. */
2830 ret = -nb_events;
2831 goto error;
2832 }
2833
2834 /*
2835 * Setup lttng message with payload size set to the event list size in
2836 * bytes and then copy list into the llm payload.
2837 */
2838 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
2839 if (ret < 0) {
2840 free(events);
2841 goto setup_error;
2842 }
2843
2844 /* Copy event list into message payload */
2845 memcpy(cmd_ctx->llm->payload, events,
2846 sizeof(struct lttng_event) * nb_events);
2847
2848 free(events);
2849
2850 ret = LTTNG_OK;
2851 break;
2852 }
2853 case LTTNG_LIST_TRACEPOINT_FIELDS:
2854 {
2855 struct lttng_event_field *fields;
2856 ssize_t nb_fields;
2857
2858 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
2859 &fields);
2860 if (nb_fields < 0) {
2861 /* Return value is a negative lttng_error_code. */
2862 ret = -nb_fields;
2863 goto error;
2864 }
2865
2866 /*
2867 * Setup lttng message with payload size set to the event list size in
2868 * bytes and then copy list into the llm payload.
2869 */
2870 ret = setup_lttng_msg(cmd_ctx,
2871 sizeof(struct lttng_event_field) * nb_fields);
2872 if (ret < 0) {
2873 free(fields);
2874 goto setup_error;
2875 }
2876
2877 /* Copy event list into message payload */
2878 memcpy(cmd_ctx->llm->payload, fields,
2879 sizeof(struct lttng_event_field) * nb_fields);
2880
2881 free(fields);
2882
2883 ret = LTTNG_OK;
2884 break;
2885 }
2886 case LTTNG_SET_CONSUMER_URI:
2887 {
2888 size_t nb_uri, len;
2889 struct lttng_uri *uris;
2890
2891 nb_uri = cmd_ctx->lsm->u.uri.size;
2892 len = nb_uri * sizeof(struct lttng_uri);
2893
2894 if (nb_uri == 0) {
2895 ret = LTTNG_ERR_INVALID;
2896 goto error;
2897 }
2898
2899 uris = zmalloc(len);
2900 if (uris == NULL) {
2901 ret = LTTNG_ERR_FATAL;
2902 goto error;
2903 }
2904
2905 /* Receive variable len data */
2906 DBG("Receiving %zu URI(s) from client ...", nb_uri);
2907 ret = lttcomm_recv_unix_sock(sock, uris, len);
2908 if (ret <= 0) {
2909 DBG("No URIs received from client... continuing");
2910 *sock_error = 1;
2911 ret = LTTNG_ERR_SESSION_FAIL;
2912 free(uris);
2913 goto error;
2914 }
2915
2916 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
2917 nb_uri, uris);
2918 if (ret != LTTNG_OK) {
2919 free(uris);
2920 goto error;
2921 }
2922
2923 /*
2924 * XXX: 0 means that this URI should be applied on the session. Should
2925 * be a DOMAIN enuam.
2926 */
2927 if (cmd_ctx->lsm->domain.type == 0) {
2928 /* Add the URI for the UST session if a consumer is present. */
2929 if (cmd_ctx->session->ust_session &&
2930 cmd_ctx->session->ust_session->consumer) {
2931 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
2932 nb_uri, uris);
2933 } else if (cmd_ctx->session->kernel_session &&
2934 cmd_ctx->session->kernel_session->consumer) {
2935 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
2936 cmd_ctx->session, nb_uri, uris);
2937 }
2938 }
2939
2940 free(uris);
2941
2942 break;
2943 }
2944 case LTTNG_START_TRACE:
2945 {
2946 ret = cmd_start_trace(cmd_ctx->session);
2947 break;
2948 }
2949 case LTTNG_STOP_TRACE:
2950 {
2951 ret = cmd_stop_trace(cmd_ctx->session);
2952 break;
2953 }
2954 case LTTNG_CREATE_SESSION:
2955 {
2956 size_t nb_uri, len;
2957 struct lttng_uri *uris = NULL;
2958
2959 nb_uri = cmd_ctx->lsm->u.uri.size;
2960 len = nb_uri * sizeof(struct lttng_uri);
2961
2962 if (nb_uri > 0) {
2963 uris = zmalloc(len);
2964 if (uris == NULL) {
2965 ret = LTTNG_ERR_FATAL;
2966 goto error;
2967 }
2968
2969 /* Receive variable len data */
2970 DBG("Waiting for %zu URIs from client ...", nb_uri);
2971 ret = lttcomm_recv_unix_sock(sock, uris, len);
2972 if (ret <= 0) {
2973 DBG("No URIs received from client... continuing");
2974 *sock_error = 1;
2975 ret = LTTNG_ERR_SESSION_FAIL;
2976 free(uris);
2977 goto error;
2978 }
2979
2980 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
2981 DBG("Creating session with ONE network URI is a bad call");
2982 ret = LTTNG_ERR_SESSION_FAIL;
2983 free(uris);
2984 goto error;
2985 }
2986 }
2987
2988 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
2989 &cmd_ctx->creds);
2990
2991 free(uris);
2992
2993 break;
2994 }
2995 case LTTNG_DESTROY_SESSION:
2996 {
2997 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
2998
2999 /* Set session to NULL so we do not unlock it after free. */
3000 cmd_ctx->session = NULL;
3001 break;
3002 }
3003 case LTTNG_LIST_DOMAINS:
3004 {
3005 ssize_t nb_dom;
3006 struct lttng_domain *domains;
3007
3008 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3009 if (nb_dom < 0) {
3010 /* Return value is a negative lttng_error_code. */
3011 ret = -nb_dom;
3012 goto error;
3013 }
3014
3015 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3016 if (ret < 0) {
3017 free(domains);
3018 goto setup_error;
3019 }
3020
3021 /* Copy event list into message payload */
3022 memcpy(cmd_ctx->llm->payload, domains,
3023 nb_dom * sizeof(struct lttng_domain));
3024
3025 free(domains);
3026
3027 ret = LTTNG_OK;
3028 break;
3029 }
3030 case LTTNG_LIST_CHANNELS:
3031 {
3032 int nb_chan;
3033 struct lttng_channel *channels;
3034
3035 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3036 cmd_ctx->session, &channels);
3037 if (nb_chan < 0) {
3038 /* Return value is a negative lttng_error_code. */
3039 ret = -nb_chan;
3040 goto error;
3041 }
3042
3043 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3044 if (ret < 0) {
3045 free(channels);
3046 goto setup_error;
3047 }
3048
3049 /* Copy event list into message payload */
3050 memcpy(cmd_ctx->llm->payload, channels,
3051 nb_chan * sizeof(struct lttng_channel));
3052
3053 free(channels);
3054
3055 ret = LTTNG_OK;
3056 break;
3057 }
3058 case LTTNG_LIST_EVENTS:
3059 {
3060 ssize_t nb_event;
3061 struct lttng_event *events = NULL;
3062
3063 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3064 cmd_ctx->lsm->u.list.channel_name, &events);
3065 if (nb_event < 0) {
3066 /* Return value is a negative lttng_error_code. */
3067 ret = -nb_event;
3068 goto error;
3069 }
3070
3071 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3072 if (ret < 0) {
3073 free(events);
3074 goto setup_error;
3075 }
3076
3077 /* Copy event list into message payload */
3078 memcpy(cmd_ctx->llm->payload, events,
3079 nb_event * sizeof(struct lttng_event));
3080
3081 free(events);
3082
3083 ret = LTTNG_OK;
3084 break;
3085 }
3086 case LTTNG_LIST_SESSIONS:
3087 {
3088 unsigned int nr_sessions;
3089
3090 session_lock_list();
3091 nr_sessions = lttng_sessions_count(
3092 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3093 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3094
3095 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3096 if (ret < 0) {
3097 session_unlock_list();
3098 goto setup_error;
3099 }
3100
3101 /* Filled the session array */
3102 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3103 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3104 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3105
3106 session_unlock_list();
3107
3108 ret = LTTNG_OK;
3109 break;
3110 }
3111 case LTTNG_CALIBRATE:
3112 {
3113 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3114 &cmd_ctx->lsm->u.calibrate);
3115 break;
3116 }
3117 case LTTNG_REGISTER_CONSUMER:
3118 {
3119 struct consumer_data *cdata;
3120
3121 switch (cmd_ctx->lsm->domain.type) {
3122 case LTTNG_DOMAIN_KERNEL:
3123 cdata = &kconsumer_data;
3124 break;
3125 default:
3126 ret = LTTNG_ERR_UND;
3127 goto error;
3128 }
3129
3130 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3131 cmd_ctx->lsm->u.reg.path, cdata);
3132 break;
3133 }
3134 case LTTNG_ENABLE_EVENT_WITH_FILTER:
3135 {
3136 struct lttng_filter_bytecode *bytecode;
3137
3138 if (cmd_ctx->lsm->u.enable.bytecode_len > LTTNG_FILTER_MAX_LEN) {
3139 ret = LTTNG_ERR_FILTER_INVAL;
3140 goto error;
3141 }
3142 if (cmd_ctx->lsm->u.enable.bytecode_len == 0) {
3143 ret = LTTNG_ERR_FILTER_INVAL;
3144 goto error;
3145 }
3146 bytecode = zmalloc(cmd_ctx->lsm->u.enable.bytecode_len);
3147 if (!bytecode) {
3148 ret = LTTNG_ERR_FILTER_NOMEM;
3149 goto error;
3150 }
3151 /* Receive var. len. data */
3152 DBG("Receiving var len data from client ...");
3153 ret = lttcomm_recv_unix_sock(sock, bytecode,
3154 cmd_ctx->lsm->u.enable.bytecode_len);
3155 if (ret <= 0) {
3156 DBG("Nothing recv() from client var len data... continuing");
3157 *sock_error = 1;
3158 ret = LTTNG_ERR_FILTER_INVAL;
3159 goto error;
3160 }
3161
3162 if (bytecode->len + sizeof(*bytecode)
3163 != cmd_ctx->lsm->u.enable.bytecode_len) {
3164 free(bytecode);
3165 ret = LTTNG_ERR_FILTER_INVAL;
3166 goto error;
3167 }
3168
3169 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3170 cmd_ctx->lsm->u.enable.channel_name,
3171 &cmd_ctx->lsm->u.enable.event, bytecode, kernel_poll_pipe[1]);
3172 break;
3173 }
3174 case LTTNG_DATA_PENDING:
3175 {
3176 ret = cmd_data_pending(cmd_ctx->session);
3177 break;
3178 }
3179 default:
3180 ret = LTTNG_ERR_UND;
3181 break;
3182 }
3183
3184 error:
3185 if (cmd_ctx->llm == NULL) {
3186 DBG("Missing llm structure. Allocating one.");
3187 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3188 goto setup_error;
3189 }
3190 }
3191 /* Set return code */
3192 cmd_ctx->llm->ret_code = ret;
3193 setup_error:
3194 if (cmd_ctx->session) {
3195 session_unlock(cmd_ctx->session);
3196 }
3197 if (need_tracing_session) {
3198 session_unlock_list();
3199 }
3200 init_setup_error:
3201 return ret;
3202 }
3203
3204 /*
3205 * Thread managing health check socket.
3206 */
3207 static void *thread_manage_health(void *data)
3208 {
3209 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
3210 uint32_t revents, nb_fd;
3211 struct lttng_poll_event events;
3212 struct lttcomm_health_msg msg;
3213 struct lttcomm_health_data reply;
3214
3215 DBG("[thread] Manage health check started");
3216
3217 rcu_register_thread();
3218
3219 /* We might hit an error path before this is created. */
3220 lttng_poll_init(&events);
3221
3222 /* Create unix socket */
3223 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3224 if (sock < 0) {
3225 ERR("Unable to create health check Unix socket");
3226 ret = -1;
3227 goto error;
3228 }
3229
3230 /*
3231 * Set the CLOEXEC flag. Return code is useless because either way, the
3232 * show must go on.
3233 */
3234 (void) utils_set_fd_cloexec(sock);
3235
3236 ret = lttcomm_listen_unix_sock(sock);
3237 if (ret < 0) {
3238 goto error;
3239 }
3240
3241 /*
3242 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3243 * more will be added to this poll set.
3244 */
3245 ret = sessiond_set_thread_pollset(&events, 2);
3246 if (ret < 0) {
3247 goto error;
3248 }
3249
3250 /* Add the application registration socket */
3251 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3252 if (ret < 0) {
3253 goto error;
3254 }
3255
3256 while (1) {
3257 DBG("Health check ready");
3258
3259 /* Inifinite blocking call, waiting for transmission */
3260 restart:
3261 ret = lttng_poll_wait(&events, -1);
3262 if (ret < 0) {
3263 /*
3264 * Restart interrupted system call.
3265 */
3266 if (errno == EINTR) {
3267 goto restart;
3268 }
3269 goto error;
3270 }
3271
3272 nb_fd = ret;
3273
3274 for (i = 0; i < nb_fd; i++) {
3275 /* Fetch once the poll data */
3276 revents = LTTNG_POLL_GETEV(&events, i);
3277 pollfd = LTTNG_POLL_GETFD(&events, i);
3278
3279 /* Thread quit pipe has been closed. Killing thread. */
3280 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3281 if (ret) {
3282 err = 0;
3283 goto exit;
3284 }
3285
3286 /* Event on the registration socket */
3287 if (pollfd == sock) {
3288 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3289 ERR("Health socket poll error");
3290 goto error;
3291 }
3292 }
3293 }
3294
3295 new_sock = lttcomm_accept_unix_sock(sock);
3296 if (new_sock < 0) {
3297 goto error;
3298 }
3299
3300 /*
3301 * Set the CLOEXEC flag. Return code is useless because either way, the
3302 * show must go on.
3303 */
3304 (void) utils_set_fd_cloexec(new_sock);
3305
3306 DBG("Receiving data from client for health...");
3307 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
3308 if (ret <= 0) {
3309 DBG("Nothing recv() from client... continuing");
3310 ret = close(new_sock);
3311 if (ret) {
3312 PERROR("close");
3313 }
3314 new_sock = -1;
3315 continue;
3316 }
3317
3318 rcu_thread_online();
3319
3320 switch (msg.component) {
3321 case LTTNG_HEALTH_CMD:
3322 reply.ret_code = health_check_state(HEALTH_TYPE_CMD);
3323 break;
3324 case LTTNG_HEALTH_APP_MANAGE:
3325 reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE);
3326 break;
3327 case LTTNG_HEALTH_APP_REG:
3328 reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG);
3329 break;
3330 case LTTNG_HEALTH_KERNEL:
3331 reply.ret_code = health_check_state(HEALTH_TYPE_KERNEL);
3332 break;
3333 case LTTNG_HEALTH_CONSUMER:
3334 reply.ret_code = check_consumer_health();
3335 break;
3336 case LTTNG_HEALTH_HT_CLEANUP:
3337 reply.ret_code = health_check_state(HEALTH_TYPE_HT_CLEANUP);
3338 break;
3339 case LTTNG_HEALTH_APP_MANAGE_NOTIFY:
3340 reply.ret_code = health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY);
3341 break;
3342 case LTTNG_HEALTH_APP_REG_DISPATCH:
3343 reply.ret_code = health_check_state(HEALTH_TYPE_APP_REG_DISPATCH);
3344 break;
3345 case LTTNG_HEALTH_ALL:
3346 reply.ret_code =
3347 health_check_state(HEALTH_TYPE_APP_MANAGE) &&
3348 health_check_state(HEALTH_TYPE_APP_REG) &&
3349 health_check_state(HEALTH_TYPE_CMD) &&
3350 health_check_state(HEALTH_TYPE_KERNEL) &&
3351 check_consumer_health() &&
3352 health_check_state(HEALTH_TYPE_HT_CLEANUP) &&
3353 health_check_state(HEALTH_TYPE_APP_MANAGE_NOTIFY) &&
3354 health_check_state(HEALTH_TYPE_APP_REG_DISPATCH);
3355 break;
3356 default:
3357 reply.ret_code = LTTNG_ERR_UND;
3358 break;
3359 }
3360
3361 /*
3362 * Flip ret value since 0 is a success and 1 indicates a bad health for
3363 * the client where in the sessiond it is the opposite. Again, this is
3364 * just to make things easier for us poor developer which enjoy a lot
3365 * lazyness.
3366 */
3367 if (reply.ret_code == 0 || reply.ret_code == 1) {
3368 reply.ret_code = !reply.ret_code;
3369 }
3370
3371 DBG2("Health check return value %d", reply.ret_code);
3372
3373 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3374 if (ret < 0) {
3375 ERR("Failed to send health data back to client");
3376 }
3377
3378 /* End of transmission */
3379 ret = close(new_sock);
3380 if (ret) {
3381 PERROR("close");
3382 }
3383 new_sock = -1;
3384 }
3385
3386 exit:
3387 error:
3388 if (err) {
3389 ERR("Health error occurred in %s", __func__);
3390 }
3391 DBG("Health check thread dying");
3392 unlink(health_unix_sock_path);
3393 if (sock >= 0) {
3394 ret = close(sock);
3395 if (ret) {
3396 PERROR("close");
3397 }
3398 }
3399
3400 lttng_poll_clean(&events);
3401
3402 rcu_unregister_thread();
3403 return NULL;
3404 }
3405
3406 /*
3407 * This thread manage all clients request using the unix client socket for
3408 * communication.
3409 */
3410 static void *thread_manage_clients(void *data)
3411 {
3412 int sock = -1, ret, i, pollfd, err = -1;
3413 int sock_error;
3414 uint32_t revents, nb_fd;
3415 struct command_ctx *cmd_ctx = NULL;
3416 struct lttng_poll_event events;
3417
3418 DBG("[thread] Manage client started");
3419
3420 rcu_register_thread();
3421
3422 health_register(HEALTH_TYPE_CMD);
3423
3424 if (testpoint(thread_manage_clients)) {
3425 goto error_testpoint;
3426 }
3427
3428 health_code_update();
3429
3430 ret = lttcomm_listen_unix_sock(client_sock);
3431 if (ret < 0) {
3432 goto error_listen;
3433 }
3434
3435 /*
3436 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3437 * more will be added to this poll set.
3438 */
3439 ret = sessiond_set_thread_pollset(&events, 2);
3440 if (ret < 0) {
3441 goto error_create_poll;
3442 }
3443
3444 /* Add the application registration socket */
3445 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3446 if (ret < 0) {
3447 goto error;
3448 }
3449
3450 /*
3451 * Notify parent pid that we are ready to accept command for client side.
3452 */
3453 if (opt_sig_parent) {
3454 kill(ppid, SIGUSR1);
3455 }
3456
3457 if (testpoint(thread_manage_clients_before_loop)) {
3458 goto error;
3459 }
3460
3461 health_code_update();
3462
3463 while (1) {
3464 DBG("Accepting client command ...");
3465
3466 /* Inifinite blocking call, waiting for transmission */
3467 restart:
3468 health_poll_entry();
3469 ret = lttng_poll_wait(&events, -1);
3470 health_poll_exit();
3471 if (ret < 0) {
3472 /*
3473 * Restart interrupted system call.
3474 */
3475 if (errno == EINTR) {
3476 goto restart;
3477 }
3478 goto error;
3479 }
3480
3481 nb_fd = ret;
3482
3483 for (i = 0; i < nb_fd; i++) {
3484 /* Fetch once the poll data */
3485 revents = LTTNG_POLL_GETEV(&events, i);
3486 pollfd = LTTNG_POLL_GETFD(&events, i);
3487
3488 health_code_update();
3489
3490 /* Thread quit pipe has been closed. Killing thread. */
3491 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3492 if (ret) {
3493 err = 0;
3494 goto exit;
3495 }
3496
3497 /* Event on the registration socket */
3498 if (pollfd == client_sock) {
3499 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3500 ERR("Client socket poll error");
3501 goto error;
3502 }
3503 }
3504 }
3505
3506 DBG("Wait for client response");
3507
3508 health_code_update();
3509
3510 sock = lttcomm_accept_unix_sock(client_sock);
3511 if (sock < 0) {
3512 goto error;
3513 }
3514
3515 /*
3516 * Set the CLOEXEC flag. Return code is useless because either way, the
3517 * show must go on.
3518 */
3519 (void) utils_set_fd_cloexec(sock);
3520
3521 /* Set socket option for credentials retrieval */
3522 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3523 if (ret < 0) {
3524 goto error;
3525 }
3526
3527 /* Allocate context command to process the client request */
3528 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3529 if (cmd_ctx == NULL) {
3530 PERROR("zmalloc cmd_ctx");
3531 goto error;
3532 }
3533
3534 /* Allocate data buffer for reception */
3535 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3536 if (cmd_ctx->lsm == NULL) {
3537 PERROR("zmalloc cmd_ctx->lsm");
3538 goto error;
3539 }
3540
3541 cmd_ctx->llm = NULL;
3542 cmd_ctx->session = NULL;
3543
3544 health_code_update();
3545
3546 /*
3547 * Data is received from the lttng client. The struct
3548 * lttcomm_session_msg (lsm) contains the command and data request of
3549 * the client.
3550 */
3551 DBG("Receiving data from client ...");
3552 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3553 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3554 if (ret <= 0) {
3555 DBG("Nothing recv() from client... continuing");
3556 ret = close(sock);
3557 if (ret) {
3558 PERROR("close");
3559 }
3560 sock = -1;
3561 clean_command_ctx(&cmd_ctx);
3562 continue;
3563 }
3564
3565 health_code_update();
3566
3567 // TODO: Validate cmd_ctx including sanity check for
3568 // security purpose.
3569
3570 rcu_thread_online();
3571 /*
3572 * This function dispatch the work to the kernel or userspace tracer
3573 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3574 * informations for the client. The command context struct contains
3575 * everything this function may needs.
3576 */
3577 ret = process_client_msg(cmd_ctx, sock, &sock_error);
3578 rcu_thread_offline();
3579 if (ret < 0) {
3580 ret = close(sock);
3581 if (ret) {
3582 PERROR("close");
3583 }
3584 sock = -1;
3585 /*
3586 * TODO: Inform client somehow of the fatal error. At
3587 * this point, ret < 0 means that a zmalloc failed
3588 * (ENOMEM). Error detected but still accept
3589 * command, unless a socket error has been
3590 * detected.
3591 */
3592 clean_command_ctx(&cmd_ctx);
3593 continue;
3594 }
3595
3596 health_code_update();
3597
3598 DBG("Sending response (size: %d, retcode: %s)",
3599 cmd_ctx->lttng_msg_size,
3600 lttng_strerror(-cmd_ctx->llm->ret_code));
3601 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3602 if (ret < 0) {
3603 ERR("Failed to send data back to client");
3604 }
3605
3606 /* End of transmission */
3607 ret = close(sock);
3608 if (ret) {
3609 PERROR("close");
3610 }
3611 sock = -1;
3612
3613 clean_command_ctx(&cmd_ctx);
3614
3615 health_code_update();
3616 }
3617
3618 exit:
3619 error:
3620 if (sock >= 0) {
3621 ret = close(sock);
3622 if (ret) {
3623 PERROR("close");
3624 }
3625 }
3626
3627 lttng_poll_clean(&events);
3628 clean_command_ctx(&cmd_ctx);
3629
3630 error_listen:
3631 error_create_poll:
3632 error_testpoint:
3633 unlink(client_unix_sock_path);
3634 if (client_sock >= 0) {
3635 ret = close(client_sock);
3636 if (ret) {
3637 PERROR("close");
3638 }
3639 }
3640
3641 if (err) {
3642 health_error();
3643 ERR("Health error occurred in %s", __func__);
3644 }
3645
3646 health_unregister();
3647
3648 DBG("Client thread dying");
3649
3650 rcu_unregister_thread();
3651 return NULL;
3652 }
3653
3654
3655 /*
3656 * usage function on stderr
3657 */
3658 static void usage(void)
3659 {
3660 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3661 fprintf(stderr, " -h, --help Display this usage.\n");
3662 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3663 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3664 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3665 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3666 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3667 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3668 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3669 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3670 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3671 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3672 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3673 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3674 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3675 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3676 fprintf(stderr, " -V, --version Show version number.\n");
3677 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3678 fprintf(stderr, " -q, --quiet No output at all.\n");
3679 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3680 fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
3681 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3682 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3683 }
3684
3685 /*
3686 * daemon argument parsing
3687 */
3688 static int parse_args(int argc, char **argv)
3689 {
3690 int c;
3691
3692 static struct option long_options[] = {
3693 { "client-sock", 1, 0, 'c' },
3694 { "apps-sock", 1, 0, 'a' },
3695 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3696 { "kconsumerd-err-sock", 1, 0, 'E' },
3697 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3698 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3699 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3700 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3701 { "consumerd32-path", 1, 0, 'u' },
3702 { "consumerd32-libdir", 1, 0, 'U' },
3703 { "consumerd64-path", 1, 0, 't' },
3704 { "consumerd64-libdir", 1, 0, 'T' },
3705 { "daemonize", 0, 0, 'd' },
3706 { "sig-parent", 0, 0, 'S' },
3707 { "help", 0, 0, 'h' },
3708 { "group", 1, 0, 'g' },
3709 { "version", 0, 0, 'V' },
3710 { "quiet", 0, 0, 'q' },
3711 { "verbose", 0, 0, 'v' },
3712 { "verbose-consumer", 0, 0, 'Z' },
3713 { "no-kernel", 0, 0, 'N' },
3714 { "pidfile", 1, 0, 'p' },
3715 { NULL, 0, 0, 0 }
3716 };
3717
3718 while (1) {
3719 int option_index = 0;
3720 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t:p:",
3721 long_options, &option_index);
3722 if (c == -1) {
3723 break;
3724 }
3725
3726 switch (c) {
3727 case 0:
3728 fprintf(stderr, "option %s", long_options[option_index].name);
3729 if (optarg) {
3730 fprintf(stderr, " with arg %s\n", optarg);
3731 }
3732 break;
3733 case 'c':
3734 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3735 break;
3736 case 'a':
3737 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3738 break;
3739 case 'd':
3740 opt_daemon = 1;
3741 break;
3742 case 'g':
3743 opt_tracing_group = optarg;
3744 break;
3745 case 'h':
3746 usage();
3747 exit(EXIT_FAILURE);
3748 case 'V':
3749 fprintf(stdout, "%s\n", VERSION);
3750 exit(EXIT_SUCCESS);
3751 case 'S':
3752 opt_sig_parent = 1;
3753 break;
3754 case 'E':
3755 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3756 break;
3757 case 'C':
3758 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3759 break;
3760 case 'F':
3761 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3762 break;
3763 case 'D':
3764 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3765 break;
3766 case 'H':
3767 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3768 break;
3769 case 'G':
3770 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3771 break;
3772 case 'N':
3773 opt_no_kernel = 1;
3774 break;
3775 case 'q':
3776 lttng_opt_quiet = 1;
3777 break;
3778 case 'v':
3779 /* Verbose level can increase using multiple -v */
3780 lttng_opt_verbose += 1;
3781 break;
3782 case 'Z':
3783 opt_verbose_consumer += 1;
3784 break;
3785 case 'u':
3786 consumerd32_bin= optarg;
3787 break;
3788 case 'U':
3789 consumerd32_libdir = optarg;
3790 break;
3791 case 't':
3792 consumerd64_bin = optarg;
3793 break;
3794 case 'T':
3795 consumerd64_libdir = optarg;
3796 break;
3797 case 'p':
3798 opt_pidfile = optarg;
3799 break;
3800 default:
3801 /* Unknown option or other error.
3802 * Error is printed by getopt, just return */
3803 return -1;
3804 }
3805 }
3806
3807 return 0;
3808 }
3809
3810 /*
3811 * Creates the two needed socket by the daemon.
3812 * apps_sock - The communication socket for all UST apps.
3813 * client_sock - The communication of the cli tool (lttng).
3814 */
3815 static int init_daemon_socket(void)
3816 {
3817 int ret = 0;
3818 mode_t old_umask;
3819
3820 old_umask = umask(0);
3821
3822 /* Create client tool unix socket */
3823 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3824 if (client_sock < 0) {
3825 ERR("Create unix sock failed: %s", client_unix_sock_path);
3826 ret = -1;
3827 goto end;
3828 }
3829
3830 /* Set the cloexec flag */
3831 ret = utils_set_fd_cloexec(client_sock);
3832 if (ret < 0) {
3833 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
3834 "Continuing but note that the consumer daemon will have a "
3835 "reference to this socket on exec()", client_sock);
3836 }
3837
3838 /* File permission MUST be 660 */
3839 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3840 if (ret < 0) {
3841 ERR("Set file permissions failed: %s", client_unix_sock_path);
3842 PERROR("chmod");
3843 goto end;
3844 }
3845
3846 /* Create the application unix socket */
3847 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3848 if (apps_sock < 0) {
3849 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3850 ret = -1;
3851 goto end;
3852 }
3853
3854 /* Set the cloexec flag */
3855 ret = utils_set_fd_cloexec(apps_sock);
3856 if (ret < 0) {
3857 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
3858 "Continuing but note that the consumer daemon will have a "
3859 "reference to this socket on exec()", apps_sock);
3860 }
3861
3862 /* File permission MUST be 666 */
3863 ret = chmod(apps_unix_sock_path,
3864 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3865 if (ret < 0) {
3866 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3867 PERROR("chmod");
3868 goto end;
3869 }
3870
3871 DBG3("Session daemon client socket %d and application socket %d created",
3872 client_sock, apps_sock);
3873
3874 end:
3875 umask(old_umask);
3876 return ret;
3877 }
3878
3879 /*
3880 * Check if the global socket is available, and if a daemon is answering at the
3881 * other side. If yes, error is returned.
3882 */
3883 static int check_existing_daemon(void)
3884 {
3885 /* Is there anybody out there ? */
3886 if (lttng_session_daemon_alive()) {
3887 return -EEXIST;
3888 }
3889
3890 return 0;
3891 }
3892
3893 /*
3894 * Set the tracing group gid onto the client socket.
3895 *
3896 * Race window between mkdir and chown is OK because we are going from more
3897 * permissive (root.root) to less permissive (root.tracing).
3898 */
3899 static int set_permissions(char *rundir)
3900 {
3901 int ret;
3902 gid_t gid;
3903
3904 ret = allowed_group();
3905 if (ret < 0) {
3906 WARN("No tracing group detected");
3907 ret = 0;
3908 goto end;
3909 }
3910
3911 gid = ret;
3912
3913 /* Set lttng run dir */
3914 ret = chown(rundir, 0, gid);
3915 if (ret < 0) {
3916 ERR("Unable to set group on %s", rundir);
3917 PERROR("chown");
3918 }
3919
3920 /* Ensure tracing group can search the run dir */
3921 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
3922 if (ret < 0) {
3923 ERR("Unable to set permissions on %s", rundir);
3924 PERROR("chmod");
3925 }
3926
3927 /* lttng client socket path */
3928 ret = chown(client_unix_sock_path, 0, gid);
3929 if (ret < 0) {
3930 ERR("Unable to set group on %s", client_unix_sock_path);
3931 PERROR("chown");
3932 }
3933
3934 /* kconsumer error socket path */
3935 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3936 if (ret < 0) {
3937 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3938 PERROR("chown");
3939 }
3940
3941 /* 64-bit ustconsumer error socket path */
3942 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3943 if (ret < 0) {
3944 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3945 PERROR("chown");
3946 }
3947
3948 /* 32-bit ustconsumer compat32 error socket path */
3949 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3950 if (ret < 0) {
3951 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3952 PERROR("chown");
3953 }
3954
3955 DBG("All permissions are set");
3956
3957 end:
3958 return ret;
3959 }
3960
3961 /*
3962 * Create the lttng run directory needed for all global sockets and pipe.
3963 */
3964 static int create_lttng_rundir(const char *rundir)
3965 {
3966 int ret;
3967
3968 DBG3("Creating LTTng run directory: %s", rundir);
3969
3970 ret = mkdir(rundir, S_IRWXU);
3971 if (ret < 0) {
3972 if (errno != EEXIST) {
3973 ERR("Unable to create %s", rundir);
3974 goto error;
3975 } else {
3976 ret = 0;
3977 }
3978 }
3979
3980 error:
3981 return ret;
3982 }
3983
3984 /*
3985 * Setup sockets and directory needed by the kconsumerd communication with the
3986 * session daemon.
3987 */
3988 static int set_consumer_sockets(struct consumer_data *consumer_data,
3989 const char *rundir)
3990 {
3991 int ret;
3992 char path[PATH_MAX];
3993
3994 switch (consumer_data->type) {
3995 case LTTNG_CONSUMER_KERNEL:
3996 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
3997 break;
3998 case LTTNG_CONSUMER64_UST:
3999 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4000 break;
4001 case LTTNG_CONSUMER32_UST:
4002 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4003 break;
4004 default:
4005 ERR("Consumer type unknown");
4006 ret = -EINVAL;
4007 goto error;
4008 }
4009
4010 DBG2("Creating consumer directory: %s", path);
4011
4012 ret = mkdir(path, S_IRWXU);
4013 if (ret < 0) {
4014 if (errno != EEXIST) {
4015 PERROR("mkdir");
4016 ERR("Failed to create %s", path);
4017 goto error;
4018 }
4019 ret = -1;
4020 }
4021
4022 /* Create the kconsumerd error unix socket */
4023 consumer_data->err_sock =
4024 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4025 if (consumer_data->err_sock < 0) {
4026 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4027 ret = -1;
4028 goto error;
4029 }
4030
4031 /* File permission MUST be 660 */
4032 ret = chmod(consumer_data->err_unix_sock_path,
4033 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4034 if (ret < 0) {
4035 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4036 PERROR("chmod");
4037 goto error;
4038 }
4039
4040 error:
4041 return ret;
4042 }
4043
4044 /*
4045 * Signal handler for the daemon
4046 *
4047 * Simply stop all worker threads, leaving main() return gracefully after
4048 * joining all threads and calling cleanup().
4049 */
4050 static void sighandler(int sig)
4051 {
4052 switch (sig) {
4053 case SIGPIPE:
4054 DBG("SIGPIPE caught");
4055 return;
4056 case SIGINT:
4057 DBG("SIGINT caught");
4058 stop_threads();
4059 break;
4060 case SIGTERM:
4061 DBG("SIGTERM caught");
4062 stop_threads();
4063 break;
4064 default:
4065 break;
4066 }
4067 }
4068
4069 /*
4070 * Setup signal handler for :
4071 * SIGINT, SIGTERM, SIGPIPE
4072 */
4073 static int set_signal_handler(void)
4074 {
4075 int ret = 0;
4076 struct sigaction sa;
4077 sigset_t sigset;
4078
4079 if ((ret = sigemptyset(&sigset)) < 0) {
4080 PERROR("sigemptyset");
4081 return ret;
4082 }
4083
4084 sa.sa_handler = sighandler;
4085 sa.sa_mask = sigset;
4086 sa.sa_flags = 0;
4087 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4088 PERROR("sigaction");
4089 return ret;
4090 }
4091
4092 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4093 PERROR("sigaction");
4094 return ret;
4095 }
4096
4097 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4098 PERROR("sigaction");
4099 return ret;
4100 }
4101
4102 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4103
4104 return ret;
4105 }
4106
4107 /*
4108 * Set open files limit to unlimited. This daemon can open a large number of
4109 * file descriptors in order to consumer multiple kernel traces.
4110 */
4111 static void set_ulimit(void)
4112 {
4113 int ret;
4114 struct rlimit lim;
4115
4116 /* The kernel does not allowed an infinite limit for open files */
4117 lim.rlim_cur = 65535;
4118 lim.rlim_max = 65535;
4119
4120 ret = setrlimit(RLIMIT_NOFILE, &lim);
4121 if (ret < 0) {
4122 PERROR("failed to set open files limit");
4123 }
4124 }
4125
4126 /*
4127 * Write pidfile using the rundir and opt_pidfile.
4128 */
4129 static void write_pidfile(void)
4130 {
4131 int ret;
4132 char pidfile_path[PATH_MAX];
4133
4134 assert(rundir);
4135
4136 if (opt_pidfile) {
4137 strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
4138 } else {
4139 /* Build pidfile path from rundir and opt_pidfile. */
4140 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
4141 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
4142 if (ret < 0) {
4143 PERROR("snprintf pidfile path");
4144 goto error;
4145 }
4146 }
4147
4148 /*
4149 * Create pid file in rundir. Return value is of no importance. The
4150 * execution will continue even though we are not able to write the file.
4151 */
4152 (void) utils_create_pid_file(getpid(), pidfile_path);
4153
4154 error:
4155 return;
4156 }
4157
4158 /*
4159 * main
4160 */
4161 int main(int argc, char **argv)
4162 {
4163 int ret = 0;
4164 void *status;
4165 const char *home_path, *env_app_timeout;
4166
4167 init_kernel_workarounds();
4168
4169 rcu_register_thread();
4170
4171 setup_consumerd_path();
4172
4173 page_size = sysconf(_SC_PAGESIZE);
4174 if (page_size < 0) {
4175 PERROR("sysconf _SC_PAGESIZE");
4176 page_size = LONG_MAX;
4177 WARN("Fallback page size to %ld", page_size);
4178 }
4179
4180 /* Parse arguments */
4181 progname = argv[0];
4182 if ((ret = parse_args(argc, argv)) < 0) {
4183 goto error;
4184 }
4185
4186 /* Daemonize */
4187 if (opt_daemon) {
4188 int i;
4189
4190 /*
4191 * fork
4192 * child: setsid, close FD 0, 1, 2, chdir /
4193 * parent: exit (if fork is successful)
4194 */
4195 ret = daemon(0, 0);
4196 if (ret < 0) {
4197 PERROR("daemon");
4198 goto error;
4199 }
4200 /*
4201 * We are in the child. Make sure all other file
4202 * descriptors are closed, in case we are called with
4203 * more opened file descriptors than the standard ones.
4204 */
4205 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4206 (void) close(i);
4207 }
4208 }
4209
4210 /* Create thread quit pipe */
4211 if ((ret = init_thread_quit_pipe()) < 0) {
4212 goto error;
4213 }
4214
4215 /* Check if daemon is UID = 0 */
4216 is_root = !getuid();
4217
4218 if (is_root) {
4219 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4220
4221 /* Create global run dir with root access */
4222 ret = create_lttng_rundir(rundir);
4223 if (ret < 0) {
4224 goto error;
4225 }
4226
4227 if (strlen(apps_unix_sock_path) == 0) {
4228 snprintf(apps_unix_sock_path, PATH_MAX,
4229 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4230 }
4231
4232 if (strlen(client_unix_sock_path) == 0) {
4233 snprintf(client_unix_sock_path, PATH_MAX,
4234 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4235 }
4236
4237 /* Set global SHM for ust */
4238 if (strlen(wait_shm_path) == 0) {
4239 snprintf(wait_shm_path, PATH_MAX,
4240 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4241 }
4242
4243 if (strlen(health_unix_sock_path) == 0) {
4244 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4245 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
4246 }
4247
4248 /* Setup kernel consumerd path */
4249 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4250 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4251 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4252 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4253
4254 DBG2("Kernel consumer err path: %s",
4255 kconsumer_data.err_unix_sock_path);
4256 DBG2("Kernel consumer cmd path: %s",
4257 kconsumer_data.cmd_unix_sock_path);
4258 } else {
4259 home_path = utils_get_home_dir();
4260 if (home_path == NULL) {
4261 /* TODO: Add --socket PATH option */
4262 ERR("Can't get HOME directory for sockets creation.");
4263 ret = -EPERM;
4264 goto error;
4265 }
4266
4267 /*
4268 * Create rundir from home path. This will create something like
4269 * $HOME/.lttng
4270 */
4271 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4272 if (ret < 0) {
4273 ret = -ENOMEM;
4274 goto error;
4275 }
4276
4277 ret = create_lttng_rundir(rundir);
4278 if (ret < 0) {
4279 goto error;
4280 }
4281
4282 if (strlen(apps_unix_sock_path) == 0) {
4283 snprintf(apps_unix_sock_path, PATH_MAX,
4284 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4285 }
4286
4287 /* Set the cli tool unix socket path */
4288 if (strlen(client_unix_sock_path) == 0) {
4289 snprintf(client_unix_sock_path, PATH_MAX,
4290 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4291 }
4292
4293 /* Set global SHM for ust */
4294 if (strlen(wait_shm_path) == 0) {
4295 snprintf(wait_shm_path, PATH_MAX,
4296 DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
4297 }
4298
4299 /* Set health check Unix path */
4300 if (strlen(health_unix_sock_path) == 0) {
4301 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4302 DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path);
4303 }
4304 }
4305
4306 /* Set consumer initial state */
4307 kernel_consumerd_state = CONSUMER_STOPPED;
4308 ust_consumerd_state = CONSUMER_STOPPED;
4309
4310 DBG("Client socket path %s", client_unix_sock_path);
4311 DBG("Application socket path %s", apps_unix_sock_path);
4312 DBG("Application wait path %s", wait_shm_path);
4313 DBG("LTTng run directory path: %s", rundir);
4314
4315 /* 32 bits consumerd path setup */
4316 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4317 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4318 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4319 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4320
4321 DBG2("UST consumer 32 bits err path: %s",
4322 ustconsumer32_data.err_unix_sock_path);
4323 DBG2("UST consumer 32 bits cmd path: %s",
4324 ustconsumer32_data.cmd_unix_sock_path);
4325
4326 /* 64 bits consumerd path setup */
4327 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4328 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4329 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4330 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4331
4332 DBG2("UST consumer 64 bits err path: %s",
4333 ustconsumer64_data.err_unix_sock_path);
4334 DBG2("UST consumer 64 bits cmd path: %s",
4335 ustconsumer64_data.cmd_unix_sock_path);
4336
4337 /*
4338 * See if daemon already exist.
4339 */
4340 if ((ret = check_existing_daemon()) < 0) {
4341 ERR("Already running daemon.\n");
4342 /*
4343 * We do not goto exit because we must not cleanup()
4344 * because a daemon is already running.
4345 */
4346 goto error;
4347 }
4348
4349 /*
4350 * Init UST app hash table. Alloc hash table before this point since
4351 * cleanup() can get called after that point.
4352 */
4353 ust_app_ht_alloc();
4354
4355 /* After this point, we can safely call cleanup() with "goto exit" */
4356
4357 /*
4358 * These actions must be executed as root. We do that *after* setting up
4359 * the sockets path because we MUST make the check for another daemon using
4360 * those paths *before* trying to set the kernel consumer sockets and init
4361 * kernel tracer.
4362 */
4363 if (is_root) {
4364 ret = set_consumer_sockets(&kconsumer_data, rundir);
4365 if (ret < 0) {
4366 goto exit;
4367 }
4368
4369 /* Setup kernel tracer */
4370 if (!opt_no_kernel) {
4371 init_kernel_tracer();
4372 }
4373
4374 /* Set ulimit for open files */
4375 set_ulimit();
4376 }
4377 /* init lttng_fd tracking must be done after set_ulimit. */
4378 lttng_fd_init();
4379
4380 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4381 if (ret < 0) {
4382 goto exit;
4383 }
4384
4385 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4386 if (ret < 0) {
4387 goto exit;
4388 }
4389
4390 if ((ret = set_signal_handler()) < 0) {
4391 goto exit;
4392 }
4393
4394 /* Setup the needed unix socket */
4395 if ((ret = init_daemon_socket()) < 0) {
4396 goto exit;
4397 }
4398
4399 /* Set credentials to socket */
4400 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4401 goto exit;
4402 }
4403
4404 /* Get parent pid if -S, --sig-parent is specified. */
4405 if (opt_sig_parent) {
4406 ppid = getppid();
4407 }
4408
4409 /* Setup the kernel pipe for waking up the kernel thread */
4410 if (is_root && !opt_no_kernel) {
4411 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
4412 goto exit;
4413 }
4414 }
4415
4416 /* Setup the thread ht_cleanup communication pipe. */
4417 if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) {
4418 goto exit;
4419 }
4420
4421 /* Setup the thread apps communication pipe. */
4422 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
4423 goto exit;
4424 }
4425
4426 /* Setup the thread apps notify communication pipe. */
4427 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) {
4428 goto exit;
4429 }
4430
4431 /* Initialize global buffer per UID and PID registry. */
4432 buffer_reg_init_uid_registry();
4433 buffer_reg_init_pid_registry();
4434
4435 /* Init UST command queue. */
4436 cds_wfq_init(&ust_cmd_queue.queue);
4437
4438 /*
4439 * Get session list pointer. This pointer MUST NOT be free(). This list is
4440 * statically declared in session.c
4441 */
4442 session_list_ptr = session_get_list();
4443
4444 /* Set up max poll set size */
4445 lttng_poll_set_max_size();
4446
4447 cmd_init();
4448
4449 /* Check for the application socket timeout env variable. */
4450 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
4451 if (env_app_timeout) {
4452 app_socket_timeout = atoi(env_app_timeout);
4453 } else {
4454 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
4455 }
4456
4457 write_pidfile();
4458
4459 /* Create thread to manage the client socket */
4460 ret = pthread_create(&ht_cleanup_thread, NULL,
4461 thread_ht_cleanup, (void *) NULL);
4462 if (ret != 0) {
4463 PERROR("pthread_create ht_cleanup");
4464 goto exit_ht_cleanup;
4465 }
4466
4467 /* Create thread to manage the client socket */
4468 ret = pthread_create(&health_thread, NULL,
4469 thread_manage_health, (void *) NULL);
4470 if (ret != 0) {
4471 PERROR("pthread_create health");
4472 goto exit_health;
4473 }
4474
4475 /* Create thread to manage the client socket */
4476 ret = pthread_create(&client_thread, NULL,
4477 thread_manage_clients, (void *) NULL);
4478 if (ret != 0) {
4479 PERROR("pthread_create clients");
4480 goto exit_client;
4481 }
4482
4483 /* Create thread to dispatch registration */
4484 ret = pthread_create(&dispatch_thread, NULL,
4485 thread_dispatch_ust_registration, (void *) NULL);
4486 if (ret != 0) {
4487 PERROR("pthread_create dispatch");
4488 goto exit_dispatch;
4489 }
4490
4491 /* Create thread to manage application registration. */
4492 ret = pthread_create(&reg_apps_thread, NULL,
4493 thread_registration_apps, (void *) NULL);
4494 if (ret != 0) {
4495 PERROR("pthread_create registration");
4496 goto exit_reg_apps;
4497 }
4498
4499 /* Create thread to manage application socket */
4500 ret = pthread_create(&apps_thread, NULL,
4501 thread_manage_apps, (void *) NULL);
4502 if (ret != 0) {
4503 PERROR("pthread_create apps");
4504 goto exit_apps;
4505 }
4506
4507 /* Create thread to manage application notify socket */
4508 ret = pthread_create(&apps_notify_thread, NULL,
4509 ust_thread_manage_notify, (void *) NULL);
4510 if (ret != 0) {
4511 PERROR("pthread_create apps");
4512 goto exit_apps;
4513 }
4514
4515 /* Don't start this thread if kernel tracing is not requested nor root */
4516 if (is_root && !opt_no_kernel) {
4517 /* Create kernel thread to manage kernel event */
4518 ret = pthread_create(&kernel_thread, NULL,
4519 thread_manage_kernel, (void *) NULL);
4520 if (ret != 0) {
4521 PERROR("pthread_create kernel");
4522 goto exit_kernel;
4523 }
4524
4525 ret = pthread_join(kernel_thread, &status);
4526 if (ret != 0) {
4527 PERROR("pthread_join");
4528 goto error; /* join error, exit without cleanup */
4529 }
4530 }
4531
4532 exit_kernel:
4533 ret = pthread_join(apps_thread, &status);
4534 if (ret != 0) {
4535 PERROR("pthread_join");
4536 goto error; /* join error, exit without cleanup */
4537 }
4538
4539 exit_apps:
4540 ret = pthread_join(reg_apps_thread, &status);
4541 if (ret != 0) {
4542 PERROR("pthread_join");
4543 goto error; /* join error, exit without cleanup */
4544 }
4545
4546 exit_reg_apps:
4547 ret = pthread_join(dispatch_thread, &status);
4548 if (ret != 0) {
4549 PERROR("pthread_join");
4550 goto error; /* join error, exit without cleanup */
4551 }
4552
4553 exit_dispatch:
4554 ret = pthread_join(client_thread, &status);
4555 if (ret != 0) {
4556 PERROR("pthread_join");
4557 goto error; /* join error, exit without cleanup */
4558 }
4559
4560 ret = join_consumer_thread(&kconsumer_data);
4561 if (ret != 0) {
4562 PERROR("join_consumer");
4563 goto error; /* join error, exit without cleanup */
4564 }
4565
4566 ret = join_consumer_thread(&ustconsumer32_data);
4567 if (ret != 0) {
4568 PERROR("join_consumer ust32");
4569 goto error; /* join error, exit without cleanup */
4570 }
4571
4572 ret = join_consumer_thread(&ustconsumer64_data);
4573 if (ret != 0) {
4574 PERROR("join_consumer ust64");
4575 goto error; /* join error, exit without cleanup */
4576 }
4577
4578 exit_client:
4579 ret = pthread_join(health_thread, &status);
4580 if (ret != 0) {
4581 PERROR("pthread_join health thread");
4582 goto error; /* join error, exit without cleanup */
4583 }
4584
4585 exit_health:
4586 ret = pthread_join(ht_cleanup_thread, &status);
4587 if (ret != 0) {
4588 PERROR("pthread_join ht cleanup thread");
4589 goto error; /* join error, exit without cleanup */
4590 }
4591 exit_ht_cleanup:
4592 exit:
4593 /*
4594 * cleanup() is called when no other thread is running.
4595 */
4596 rcu_thread_online();
4597 cleanup();
4598 rcu_thread_offline();
4599 rcu_unregister_thread();
4600 if (!ret) {
4601 exit(EXIT_SUCCESS);
4602 }
4603 error:
4604 exit(EXIT_FAILURE);
4605 }
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