Use lib common daemonize
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2 only,
8 * as published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
18 */
19
20 #define _GNU_SOURCE
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <paths.h>
25 #include <pthread.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <inttypes.h>
31 #include <sys/mman.h>
32 #include <sys/mount.h>
33 #include <sys/resource.h>
34 #include <sys/socket.h>
35 #include <sys/stat.h>
36 #include <sys/types.h>
37 #include <sys/wait.h>
38 #include <urcu/uatomic.h>
39 #include <unistd.h>
40 #include <config.h>
41
42 #include <common/common.h>
43 #include <common/compat/socket.h>
44 #include <common/defaults.h>
45 #include <common/kernel-consumer/kernel-consumer.h>
46 #include <common/futex.h>
47 #include <common/relayd/relayd.h>
48 #include <common/utils.h>
49 #include <common/daemonize.h>
50 #include <common/config/config.h>
51
52 #include "lttng-sessiond.h"
53 #include "buffer-registry.h"
54 #include "channel.h"
55 #include "cmd.h"
56 #include "consumer.h"
57 #include "context.h"
58 #include "event.h"
59 #include "kernel.h"
60 #include "kernel-consumer.h"
61 #include "modprobe.h"
62 #include "shm.h"
63 #include "ust-ctl.h"
64 #include "ust-consumer.h"
65 #include "utils.h"
66 #include "fd-limit.h"
67 #include "health-sessiond.h"
68 #include "testpoint.h"
69 #include "ust-thread.h"
70 #include "jul-thread.h"
71
72 #define CONSUMERD_FILE "lttng-consumerd"
73
74 const char *progname;
75 static const char *tracing_group_name = DEFAULT_TRACING_GROUP;
76 static int tracing_group_name_override;
77 static char *opt_pidfile;
78 static int opt_sig_parent;
79 static int opt_verbose_consumer;
80 static int opt_daemon;
81 static int opt_no_kernel;
82 static int is_root; /* Set to 1 if the daemon is running as root */
83 static pid_t ppid; /* Parent PID for --sig-parent option */
84 static pid_t child_ppid; /* Internal parent PID use with daemonize. */
85 static char *rundir;
86
87 /* Set to 1 when a SIGUSR1 signal is received. */
88 static int recv_child_signal;
89
90 /*
91 * Consumer daemon specific control data. Every value not initialized here is
92 * set to 0 by the static definition.
93 */
94 static struct consumer_data kconsumer_data = {
95 .type = LTTNG_CONSUMER_KERNEL,
96 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
97 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
98 .err_sock = -1,
99 .cmd_sock = -1,
100 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
101 .lock = PTHREAD_MUTEX_INITIALIZER,
102 .cond = PTHREAD_COND_INITIALIZER,
103 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
104 };
105 static struct consumer_data ustconsumer64_data = {
106 .type = LTTNG_CONSUMER64_UST,
107 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
108 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
109 .err_sock = -1,
110 .cmd_sock = -1,
111 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
112 .lock = PTHREAD_MUTEX_INITIALIZER,
113 .cond = PTHREAD_COND_INITIALIZER,
114 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
115 };
116 static struct consumer_data ustconsumer32_data = {
117 .type = LTTNG_CONSUMER32_UST,
118 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
119 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
120 .err_sock = -1,
121 .cmd_sock = -1,
122 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
123 .lock = PTHREAD_MUTEX_INITIALIZER,
124 .cond = PTHREAD_COND_INITIALIZER,
125 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
126 };
127
128 /* Command line options */
129 static const struct option long_options[] = {
130 { "client-sock", 1, 0, 'c' },
131 { "apps-sock", 1, 0, 'a' },
132 { "kconsumerd-cmd-sock", 1, 0, 'C' },
133 { "kconsumerd-err-sock", 1, 0, 'E' },
134 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
135 { "ustconsumerd32-err-sock", 1, 0, 'H' },
136 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
137 { "ustconsumerd64-err-sock", 1, 0, 'F' },
138 { "consumerd32-path", 1, 0, 'u' },
139 { "consumerd32-libdir", 1, 0, 'U' },
140 { "consumerd64-path", 1, 0, 't' },
141 { "consumerd64-libdir", 1, 0, 'T' },
142 { "daemonize", 0, 0, 'd' },
143 { "sig-parent", 0, 0, 'S' },
144 { "help", 0, 0, 'h' },
145 { "group", 1, 0, 'g' },
146 { "version", 0, 0, 'V' },
147 { "quiet", 0, 0, 'q' },
148 { "verbose", 0, 0, 'v' },
149 { "verbose-consumer", 0, 0, 'Z' },
150 { "no-kernel", 0, 0, 'N' },
151 { "pidfile", 1, 0, 'p' },
152 { "jul-tcp-port", 1, 0, 'J' },
153 { "config", 1, 0, 'f' },
154 { NULL, 0, 0, 0 }
155 };
156
157 /* Command line options to ignore from configuration file */
158 static const char *config_ignore_options[] = { "help", "version", "config" };
159
160 /* Shared between threads */
161 static int dispatch_thread_exit;
162
163 /* Global application Unix socket path */
164 static char apps_unix_sock_path[PATH_MAX];
165 /* Global client Unix socket path */
166 static char client_unix_sock_path[PATH_MAX];
167 /* global wait shm path for UST */
168 static char wait_shm_path[PATH_MAX];
169 /* Global health check unix path */
170 static char health_unix_sock_path[PATH_MAX];
171
172 /* Sockets and FDs */
173 static int client_sock = -1;
174 static int apps_sock = -1;
175 int kernel_tracer_fd = -1;
176 static int kernel_poll_pipe[2] = { -1, -1 };
177
178 /*
179 * Quit pipe for all threads. This permits a single cancellation point
180 * for all threads when receiving an event on the pipe.
181 */
182 static int thread_quit_pipe[2] = { -1, -1 };
183
184 /*
185 * This pipe is used to inform the thread managing application communication
186 * that a command is queued and ready to be processed.
187 */
188 static int apps_cmd_pipe[2] = { -1, -1 };
189
190 int apps_cmd_notify_pipe[2] = { -1, -1 };
191
192 /* Pthread, Mutexes and Semaphores */
193 static pthread_t apps_thread;
194 static pthread_t apps_notify_thread;
195 static pthread_t reg_apps_thread;
196 static pthread_t client_thread;
197 static pthread_t kernel_thread;
198 static pthread_t dispatch_thread;
199 static pthread_t health_thread;
200 static pthread_t ht_cleanup_thread;
201 static pthread_t jul_reg_thread;
202
203 /*
204 * UST registration command queue. This queue is tied with a futex and uses a N
205 * wakers / 1 waiter implemented and detailed in futex.c/.h
206 *
207 * The thread_manage_apps and thread_dispatch_ust_registration interact with
208 * this queue and the wait/wake scheme.
209 */
210 static struct ust_cmd_queue ust_cmd_queue;
211
212 /*
213 * Pointer initialized before thread creation.
214 *
215 * This points to the tracing session list containing the session count and a
216 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
217 * MUST NOT be taken if you call a public function in session.c.
218 *
219 * The lock is nested inside the structure: session_list_ptr->lock. Please use
220 * session_lock_list and session_unlock_list for lock acquisition.
221 */
222 static struct ltt_session_list *session_list_ptr;
223
224 int ust_consumerd64_fd = -1;
225 int ust_consumerd32_fd = -1;
226
227 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
228 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
229 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
230 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
231 static int consumerd32_bin_override;
232 static int consumerd64_bin_override;
233 static int consumerd32_libdir_override;
234 static int consumerd64_libdir_override;
235
236 static const char *module_proc_lttng = "/proc/lttng";
237
238 /*
239 * Consumer daemon state which is changed when spawning it, killing it or in
240 * case of a fatal error.
241 */
242 enum consumerd_state {
243 CONSUMER_STARTED = 1,
244 CONSUMER_STOPPED = 2,
245 CONSUMER_ERROR = 3,
246 };
247
248 /*
249 * This consumer daemon state is used to validate if a client command will be
250 * able to reach the consumer. If not, the client is informed. For instance,
251 * doing a "lttng start" when the consumer state is set to ERROR will return an
252 * error to the client.
253 *
254 * The following example shows a possible race condition of this scheme:
255 *
256 * consumer thread error happens
257 * client cmd arrives
258 * client cmd checks state -> still OK
259 * consumer thread exit, sets error
260 * client cmd try to talk to consumer
261 * ...
262 *
263 * However, since the consumer is a different daemon, we have no way of making
264 * sure the command will reach it safely even with this state flag. This is why
265 * we consider that up to the state validation during command processing, the
266 * command is safe. After that, we can not guarantee the correctness of the
267 * client request vis-a-vis the consumer.
268 */
269 static enum consumerd_state ust_consumerd_state;
270 static enum consumerd_state kernel_consumerd_state;
271
272 /*
273 * Socket timeout for receiving and sending in seconds.
274 */
275 static int app_socket_timeout;
276
277 /* Set in main() with the current page size. */
278 long page_size;
279
280 /* Application health monitoring */
281 struct health_app *health_sessiond;
282
283 /* JUL TCP port for registration. Used by the JUL thread. */
284 unsigned int jul_tcp_port = DEFAULT_JUL_TCP_PORT;
285
286 const char * const config_section_name = "sessiond";
287
288 /*
289 * Whether sessiond is ready for commands/health check requests.
290 * NR_LTTNG_SESSIOND_READY must match the number of calls to
291 * lttng_sessiond_notify_ready().
292 */
293 #define NR_LTTNG_SESSIOND_READY 2
294 int lttng_sessiond_ready = NR_LTTNG_SESSIOND_READY;
295
296 /* Notify parents that we are ready for cmd and health check */
297 static
298 void lttng_sessiond_notify_ready(void)
299 {
300 if (uatomic_sub_return(&lttng_sessiond_ready, 1) == 0) {
301 /*
302 * Notify parent pid that we are ready to accept command
303 * for client side. This ppid is the one from the
304 * external process that spawned us.
305 */
306 if (opt_sig_parent) {
307 kill(ppid, SIGUSR1);
308 }
309
310 /*
311 * Notify the parent of the fork() process that we are
312 * ready.
313 */
314 if (opt_daemon) {
315 kill(child_ppid, SIGUSR1);
316 }
317 }
318 }
319
320 static
321 void setup_consumerd_path(void)
322 {
323 const char *bin, *libdir;
324
325 /*
326 * Allow INSTALL_BIN_PATH to be used as a target path for the
327 * native architecture size consumer if CONFIG_CONSUMER*_PATH
328 * has not been defined.
329 */
330 #if (CAA_BITS_PER_LONG == 32)
331 if (!consumerd32_bin[0]) {
332 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
333 }
334 if (!consumerd32_libdir[0]) {
335 consumerd32_libdir = INSTALL_LIB_PATH;
336 }
337 #elif (CAA_BITS_PER_LONG == 64)
338 if (!consumerd64_bin[0]) {
339 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
340 }
341 if (!consumerd64_libdir[0]) {
342 consumerd64_libdir = INSTALL_LIB_PATH;
343 }
344 #else
345 #error "Unknown bitness"
346 #endif
347
348 /*
349 * runtime env. var. overrides the build default.
350 */
351 bin = getenv("LTTNG_CONSUMERD32_BIN");
352 if (bin) {
353 consumerd32_bin = bin;
354 }
355 bin = getenv("LTTNG_CONSUMERD64_BIN");
356 if (bin) {
357 consumerd64_bin = bin;
358 }
359 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
360 if (libdir) {
361 consumerd32_libdir = libdir;
362 }
363 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
364 if (libdir) {
365 consumerd64_libdir = libdir;
366 }
367 }
368
369 /*
370 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
371 */
372 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
373 {
374 int ret;
375
376 assert(events);
377
378 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
379 if (ret < 0) {
380 goto error;
381 }
382
383 /* Add quit pipe */
384 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
385 if (ret < 0) {
386 goto error;
387 }
388
389 return 0;
390
391 error:
392 return ret;
393 }
394
395 /*
396 * Check if the thread quit pipe was triggered.
397 *
398 * Return 1 if it was triggered else 0;
399 */
400 int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
401 {
402 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
403 return 1;
404 }
405
406 return 0;
407 }
408
409 /*
410 * Init thread quit pipe.
411 *
412 * Return -1 on error or 0 if all pipes are created.
413 */
414 static int init_thread_quit_pipe(void)
415 {
416 int ret, i;
417
418 ret = pipe(thread_quit_pipe);
419 if (ret < 0) {
420 PERROR("thread quit pipe");
421 goto error;
422 }
423
424 for (i = 0; i < 2; i++) {
425 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
426 if (ret < 0) {
427 PERROR("fcntl");
428 goto error;
429 }
430 }
431
432 error:
433 return ret;
434 }
435
436 /*
437 * Stop all threads by closing the thread quit pipe.
438 */
439 static void stop_threads(void)
440 {
441 int ret;
442
443 /* Stopping all threads */
444 DBG("Terminating all threads");
445 ret = notify_thread_pipe(thread_quit_pipe[1]);
446 if (ret < 0) {
447 ERR("write error on thread quit pipe");
448 }
449
450 /* Dispatch thread */
451 CMM_STORE_SHARED(dispatch_thread_exit, 1);
452 futex_nto1_wake(&ust_cmd_queue.futex);
453 }
454
455 /*
456 * Close every consumer sockets.
457 */
458 static void close_consumer_sockets(void)
459 {
460 int ret;
461
462 if (kconsumer_data.err_sock >= 0) {
463 ret = close(kconsumer_data.err_sock);
464 if (ret < 0) {
465 PERROR("kernel consumer err_sock close");
466 }
467 }
468 if (ustconsumer32_data.err_sock >= 0) {
469 ret = close(ustconsumer32_data.err_sock);
470 if (ret < 0) {
471 PERROR("UST consumerd32 err_sock close");
472 }
473 }
474 if (ustconsumer64_data.err_sock >= 0) {
475 ret = close(ustconsumer64_data.err_sock);
476 if (ret < 0) {
477 PERROR("UST consumerd64 err_sock close");
478 }
479 }
480 if (kconsumer_data.cmd_sock >= 0) {
481 ret = close(kconsumer_data.cmd_sock);
482 if (ret < 0) {
483 PERROR("kernel consumer cmd_sock close");
484 }
485 }
486 if (ustconsumer32_data.cmd_sock >= 0) {
487 ret = close(ustconsumer32_data.cmd_sock);
488 if (ret < 0) {
489 PERROR("UST consumerd32 cmd_sock close");
490 }
491 }
492 if (ustconsumer64_data.cmd_sock >= 0) {
493 ret = close(ustconsumer64_data.cmd_sock);
494 if (ret < 0) {
495 PERROR("UST consumerd64 cmd_sock close");
496 }
497 }
498 }
499
500 /*
501 * Cleanup the daemon
502 */
503 static void cleanup(void)
504 {
505 int ret;
506 struct ltt_session *sess, *stmp;
507 char path[PATH_MAX];
508
509 DBG("Cleaning up");
510
511 /*
512 * Close the thread quit pipe. It has already done its job,
513 * since we are now called.
514 */
515 utils_close_pipe(thread_quit_pipe);
516
517 /*
518 * If opt_pidfile is undefined, the default file will be wiped when
519 * removing the rundir.
520 */
521 if (opt_pidfile) {
522 ret = remove(opt_pidfile);
523 if (ret < 0) {
524 PERROR("remove pidfile %s", opt_pidfile);
525 }
526 }
527
528 DBG("Removing sessiond and consumerd content of directory %s", rundir);
529
530 /* sessiond */
531 snprintf(path, PATH_MAX,
532 "%s/%s",
533 rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE);
534 DBG("Removing %s", path);
535 (void) unlink(path);
536
537 snprintf(path, PATH_MAX, "%s/%s", rundir,
538 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE);
539 DBG("Removing %s", path);
540 (void) unlink(path);
541
542 /* kconsumerd */
543 snprintf(path, PATH_MAX,
544 DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
545 rundir);
546 DBG("Removing %s", path);
547 (void) unlink(path);
548
549 snprintf(path, PATH_MAX,
550 DEFAULT_KCONSUMERD_PATH,
551 rundir);
552 DBG("Removing directory %s", path);
553 (void) rmdir(path);
554
555 /* ust consumerd 32 */
556 snprintf(path, PATH_MAX,
557 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
558 rundir);
559 DBG("Removing %s", path);
560 (void) unlink(path);
561
562 snprintf(path, PATH_MAX,
563 DEFAULT_USTCONSUMERD32_PATH,
564 rundir);
565 DBG("Removing directory %s", path);
566 (void) rmdir(path);
567
568 /* ust consumerd 64 */
569 snprintf(path, PATH_MAX,
570 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
571 rundir);
572 DBG("Removing %s", path);
573 (void) unlink(path);
574
575 snprintf(path, PATH_MAX,
576 DEFAULT_USTCONSUMERD64_PATH,
577 rundir);
578 DBG("Removing directory %s", path);
579 (void) rmdir(path);
580
581 /*
582 * We do NOT rmdir rundir because there are other processes
583 * using it, for instance lttng-relayd, which can start in
584 * parallel with this teardown.
585 */
586
587 free(rundir);
588
589 DBG("Cleaning up all sessions");
590
591 /* Destroy session list mutex */
592 if (session_list_ptr != NULL) {
593 pthread_mutex_destroy(&session_list_ptr->lock);
594
595 /* Cleanup ALL session */
596 cds_list_for_each_entry_safe(sess, stmp,
597 &session_list_ptr->head, list) {
598 cmd_destroy_session(sess, kernel_poll_pipe[1]);
599 }
600 }
601
602 DBG("Closing all UST sockets");
603 ust_app_clean_list();
604 buffer_reg_destroy_registries();
605
606 if (is_root && !opt_no_kernel) {
607 DBG2("Closing kernel fd");
608 if (kernel_tracer_fd >= 0) {
609 ret = close(kernel_tracer_fd);
610 if (ret) {
611 PERROR("close");
612 }
613 }
614 DBG("Unloading kernel modules");
615 modprobe_remove_lttng_all();
616 }
617
618 close_consumer_sockets();
619
620 /*
621 * If the override option is set, the pointer points to a *non* const thus
622 * freeing it even though the variable type is set to const.
623 */
624 if (tracing_group_name_override) {
625 free((void *) tracing_group_name);
626 }
627 if (consumerd32_bin_override) {
628 free((void *) consumerd32_bin);
629 }
630 if (consumerd64_bin_override) {
631 free((void *) consumerd64_bin);
632 }
633 if (consumerd32_libdir_override) {
634 free((void *) consumerd32_libdir);
635 }
636 if (consumerd64_libdir_override) {
637 free((void *) consumerd64_libdir);
638 }
639
640 if (opt_pidfile) {
641 free(opt_pidfile);
642 }
643
644 /* <fun> */
645 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
646 "Matthew, BEET driven development works!%c[%dm",
647 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
648 /* </fun> */
649 }
650
651 /*
652 * Send data on a unix socket using the liblttsessiondcomm API.
653 *
654 * Return lttcomm error code.
655 */
656 static int send_unix_sock(int sock, void *buf, size_t len)
657 {
658 /* Check valid length */
659 if (len == 0) {
660 return -1;
661 }
662
663 return lttcomm_send_unix_sock(sock, buf, len);
664 }
665
666 /*
667 * Free memory of a command context structure.
668 */
669 static void clean_command_ctx(struct command_ctx **cmd_ctx)
670 {
671 DBG("Clean command context structure");
672 if (*cmd_ctx) {
673 if ((*cmd_ctx)->llm) {
674 free((*cmd_ctx)->llm);
675 }
676 if ((*cmd_ctx)->lsm) {
677 free((*cmd_ctx)->lsm);
678 }
679 free(*cmd_ctx);
680 *cmd_ctx = NULL;
681 }
682 }
683
684 /*
685 * Notify UST applications using the shm mmap futex.
686 */
687 static int notify_ust_apps(int active)
688 {
689 char *wait_shm_mmap;
690
691 DBG("Notifying applications of session daemon state: %d", active);
692
693 /* See shm.c for this call implying mmap, shm and futex calls */
694 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
695 if (wait_shm_mmap == NULL) {
696 goto error;
697 }
698
699 /* Wake waiting process */
700 futex_wait_update((int32_t *) wait_shm_mmap, active);
701
702 /* Apps notified successfully */
703 return 0;
704
705 error:
706 return -1;
707 }
708
709 /*
710 * Setup the outgoing data buffer for the response (llm) by allocating the
711 * right amount of memory and copying the original information from the lsm
712 * structure.
713 *
714 * Return total size of the buffer pointed by buf.
715 */
716 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
717 {
718 int ret, buf_size;
719
720 buf_size = size;
721
722 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
723 if (cmd_ctx->llm == NULL) {
724 PERROR("zmalloc");
725 ret = -ENOMEM;
726 goto error;
727 }
728
729 /* Copy common data */
730 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
731 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
732
733 cmd_ctx->llm->data_size = size;
734 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
735
736 return buf_size;
737
738 error:
739 return ret;
740 }
741
742 /*
743 * Update the kernel poll set of all channel fd available over all tracing
744 * session. Add the wakeup pipe at the end of the set.
745 */
746 static int update_kernel_poll(struct lttng_poll_event *events)
747 {
748 int ret;
749 struct ltt_session *session;
750 struct ltt_kernel_channel *channel;
751
752 DBG("Updating kernel poll set");
753
754 session_lock_list();
755 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
756 session_lock(session);
757 if (session->kernel_session == NULL) {
758 session_unlock(session);
759 continue;
760 }
761
762 cds_list_for_each_entry(channel,
763 &session->kernel_session->channel_list.head, list) {
764 /* Add channel fd to the kernel poll set */
765 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
766 if (ret < 0) {
767 session_unlock(session);
768 goto error;
769 }
770 DBG("Channel fd %d added to kernel set", channel->fd);
771 }
772 session_unlock(session);
773 }
774 session_unlock_list();
775
776 return 0;
777
778 error:
779 session_unlock_list();
780 return -1;
781 }
782
783 /*
784 * Find the channel fd from 'fd' over all tracing session. When found, check
785 * for new channel stream and send those stream fds to the kernel consumer.
786 *
787 * Useful for CPU hotplug feature.
788 */
789 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
790 {
791 int ret = 0;
792 struct ltt_session *session;
793 struct ltt_kernel_session *ksess;
794 struct ltt_kernel_channel *channel;
795
796 DBG("Updating kernel streams for channel fd %d", fd);
797
798 session_lock_list();
799 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
800 session_lock(session);
801 if (session->kernel_session == NULL) {
802 session_unlock(session);
803 continue;
804 }
805 ksess = session->kernel_session;
806
807 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
808 if (channel->fd == fd) {
809 DBG("Channel found, updating kernel streams");
810 ret = kernel_open_channel_stream(channel);
811 if (ret < 0) {
812 goto error;
813 }
814 /* Update the stream global counter */
815 ksess->stream_count_global += ret;
816
817 /*
818 * Have we already sent fds to the consumer? If yes, it means
819 * that tracing is started so it is safe to send our updated
820 * stream fds.
821 */
822 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
823 struct lttng_ht_iter iter;
824 struct consumer_socket *socket;
825
826 rcu_read_lock();
827 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
828 &iter.iter, socket, node.node) {
829 pthread_mutex_lock(socket->lock);
830 ret = kernel_consumer_send_channel_stream(socket,
831 channel, ksess,
832 session->output_traces ? 1 : 0);
833 pthread_mutex_unlock(socket->lock);
834 if (ret < 0) {
835 rcu_read_unlock();
836 goto error;
837 }
838 }
839 rcu_read_unlock();
840 }
841 goto error;
842 }
843 }
844 session_unlock(session);
845 }
846 session_unlock_list();
847 return ret;
848
849 error:
850 session_unlock(session);
851 session_unlock_list();
852 return ret;
853 }
854
855 /*
856 * For each tracing session, update newly registered apps. The session list
857 * lock MUST be acquired before calling this.
858 */
859 static void update_ust_app(int app_sock)
860 {
861 struct ltt_session *sess, *stmp;
862
863 /* Consumer is in an ERROR state. Stop any application update. */
864 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
865 /* Stop the update process since the consumer is dead. */
866 return;
867 }
868
869 /* For all tracing session(s) */
870 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
871 session_lock(sess);
872 if (sess->ust_session) {
873 ust_app_global_update(sess->ust_session, app_sock);
874 }
875 session_unlock(sess);
876 }
877 }
878
879 /*
880 * This thread manage event coming from the kernel.
881 *
882 * Features supported in this thread:
883 * -) CPU Hotplug
884 */
885 static void *thread_manage_kernel(void *data)
886 {
887 int ret, i, pollfd, update_poll_flag = 1, err = -1;
888 uint32_t revents, nb_fd;
889 char tmp;
890 struct lttng_poll_event events;
891
892 DBG("[thread] Thread manage kernel started");
893
894 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
895
896 /*
897 * This first step of the while is to clean this structure which could free
898 * non NULL pointers so initialize it before the loop.
899 */
900 lttng_poll_init(&events);
901
902 if (testpoint(sessiond_thread_manage_kernel)) {
903 goto error_testpoint;
904 }
905
906 health_code_update();
907
908 if (testpoint(sessiond_thread_manage_kernel_before_loop)) {
909 goto error_testpoint;
910 }
911
912 while (1) {
913 health_code_update();
914
915 if (update_poll_flag == 1) {
916 /* Clean events object. We are about to populate it again. */
917 lttng_poll_clean(&events);
918
919 ret = sessiond_set_thread_pollset(&events, 2);
920 if (ret < 0) {
921 goto error_poll_create;
922 }
923
924 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
925 if (ret < 0) {
926 goto error;
927 }
928
929 /* This will add the available kernel channel if any. */
930 ret = update_kernel_poll(&events);
931 if (ret < 0) {
932 goto error;
933 }
934 update_poll_flag = 0;
935 }
936
937 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
938
939 /* Poll infinite value of time */
940 restart:
941 health_poll_entry();
942 ret = lttng_poll_wait(&events, -1);
943 health_poll_exit();
944 if (ret < 0) {
945 /*
946 * Restart interrupted system call.
947 */
948 if (errno == EINTR) {
949 goto restart;
950 }
951 goto error;
952 } else if (ret == 0) {
953 /* Should not happen since timeout is infinite */
954 ERR("Return value of poll is 0 with an infinite timeout.\n"
955 "This should not have happened! Continuing...");
956 continue;
957 }
958
959 nb_fd = ret;
960
961 for (i = 0; i < nb_fd; i++) {
962 /* Fetch once the poll data */
963 revents = LTTNG_POLL_GETEV(&events, i);
964 pollfd = LTTNG_POLL_GETFD(&events, i);
965
966 health_code_update();
967
968 /* Thread quit pipe has been closed. Killing thread. */
969 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
970 if (ret) {
971 err = 0;
972 goto exit;
973 }
974
975 /* Check for data on kernel pipe */
976 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
977 (void) lttng_read(kernel_poll_pipe[0],
978 &tmp, 1);
979 /*
980 * Ret value is useless here, if this pipe gets any actions an
981 * update is required anyway.
982 */
983 update_poll_flag = 1;
984 continue;
985 } else {
986 /*
987 * New CPU detected by the kernel. Adding kernel stream to
988 * kernel session and updating the kernel consumer
989 */
990 if (revents & LPOLLIN) {
991 ret = update_kernel_stream(&kconsumer_data, pollfd);
992 if (ret < 0) {
993 continue;
994 }
995 break;
996 /*
997 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
998 * and unregister kernel stream at this point.
999 */
1000 }
1001 }
1002 }
1003 }
1004
1005 exit:
1006 error:
1007 lttng_poll_clean(&events);
1008 error_poll_create:
1009 error_testpoint:
1010 utils_close_pipe(kernel_poll_pipe);
1011 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
1012 if (err) {
1013 health_error();
1014 ERR("Health error occurred in %s", __func__);
1015 WARN("Kernel thread died unexpectedly. "
1016 "Kernel tracing can continue but CPU hotplug is disabled.");
1017 }
1018 health_unregister(health_sessiond);
1019 DBG("Kernel thread dying");
1020 return NULL;
1021 }
1022
1023 /*
1024 * Signal pthread condition of the consumer data that the thread.
1025 */
1026 static void signal_consumer_condition(struct consumer_data *data, int state)
1027 {
1028 pthread_mutex_lock(&data->cond_mutex);
1029
1030 /*
1031 * The state is set before signaling. It can be any value, it's the waiter
1032 * job to correctly interpret this condition variable associated to the
1033 * consumer pthread_cond.
1034 *
1035 * A value of 0 means that the corresponding thread of the consumer data
1036 * was not started. 1 indicates that the thread has started and is ready
1037 * for action. A negative value means that there was an error during the
1038 * thread bootstrap.
1039 */
1040 data->consumer_thread_is_ready = state;
1041 (void) pthread_cond_signal(&data->cond);
1042
1043 pthread_mutex_unlock(&data->cond_mutex);
1044 }
1045
1046 /*
1047 * This thread manage the consumer error sent back to the session daemon.
1048 */
1049 static void *thread_manage_consumer(void *data)
1050 {
1051 int sock = -1, i, ret, pollfd, err = -1;
1052 uint32_t revents, nb_fd;
1053 enum lttcomm_return_code code;
1054 struct lttng_poll_event events;
1055 struct consumer_data *consumer_data = data;
1056
1057 DBG("[thread] Manage consumer started");
1058
1059 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
1060
1061 health_code_update();
1062
1063 /*
1064 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1065 * metadata_sock. Nothing more will be added to this poll set.
1066 */
1067 ret = sessiond_set_thread_pollset(&events, 3);
1068 if (ret < 0) {
1069 goto error_poll;
1070 }
1071
1072 /*
1073 * The error socket here is already in a listening state which was done
1074 * just before spawning this thread to avoid a race between the consumer
1075 * daemon exec trying to connect and the listen() call.
1076 */
1077 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
1078 if (ret < 0) {
1079 goto error;
1080 }
1081
1082 health_code_update();
1083
1084 /* Infinite blocking call, waiting for transmission */
1085 restart:
1086 health_poll_entry();
1087
1088 if (testpoint(sessiond_thread_manage_consumer)) {
1089 goto error;
1090 }
1091
1092 ret = lttng_poll_wait(&events, -1);
1093 health_poll_exit();
1094 if (ret < 0) {
1095 /*
1096 * Restart interrupted system call.
1097 */
1098 if (errno == EINTR) {
1099 goto restart;
1100 }
1101 goto error;
1102 }
1103
1104 nb_fd = ret;
1105
1106 for (i = 0; i < nb_fd; i++) {
1107 /* Fetch once the poll data */
1108 revents = LTTNG_POLL_GETEV(&events, i);
1109 pollfd = LTTNG_POLL_GETFD(&events, i);
1110
1111 health_code_update();
1112
1113 /* Thread quit pipe has been closed. Killing thread. */
1114 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1115 if (ret) {
1116 err = 0;
1117 goto exit;
1118 }
1119
1120 /* Event on the registration socket */
1121 if (pollfd == consumer_data->err_sock) {
1122 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1123 ERR("consumer err socket poll error");
1124 goto error;
1125 }
1126 }
1127 }
1128
1129 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1130 if (sock < 0) {
1131 goto error;
1132 }
1133
1134 /*
1135 * Set the CLOEXEC flag. Return code is useless because either way, the
1136 * show must go on.
1137 */
1138 (void) utils_set_fd_cloexec(sock);
1139
1140 health_code_update();
1141
1142 DBG2("Receiving code from consumer err_sock");
1143
1144 /* Getting status code from kconsumerd */
1145 ret = lttcomm_recv_unix_sock(sock, &code,
1146 sizeof(enum lttcomm_return_code));
1147 if (ret <= 0) {
1148 goto error;
1149 }
1150
1151 health_code_update();
1152
1153 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
1154 /* Connect both socket, command and metadata. */
1155 consumer_data->cmd_sock =
1156 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1157 consumer_data->metadata_fd =
1158 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1159 if (consumer_data->cmd_sock < 0
1160 || consumer_data->metadata_fd < 0) {
1161 PERROR("consumer connect cmd socket");
1162 /* On error, signal condition and quit. */
1163 signal_consumer_condition(consumer_data, -1);
1164 goto error;
1165 }
1166 consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
1167 /* Create metadata socket lock. */
1168 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
1169 if (consumer_data->metadata_sock.lock == NULL) {
1170 PERROR("zmalloc pthread mutex");
1171 ret = -1;
1172 goto error;
1173 }
1174 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
1175
1176 signal_consumer_condition(consumer_data, 1);
1177 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
1178 DBG("Consumer metadata socket ready (fd: %d)",
1179 consumer_data->metadata_fd);
1180 } else {
1181 ERR("consumer error when waiting for SOCK_READY : %s",
1182 lttcomm_get_readable_code(-code));
1183 goto error;
1184 }
1185
1186 /* Remove the consumerd error sock since we've established a connexion */
1187 ret = lttng_poll_del(&events, consumer_data->err_sock);
1188 if (ret < 0) {
1189 goto error;
1190 }
1191
1192 /* Add new accepted error socket. */
1193 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1194 if (ret < 0) {
1195 goto error;
1196 }
1197
1198 /* Add metadata socket that is successfully connected. */
1199 ret = lttng_poll_add(&events, consumer_data->metadata_fd,
1200 LPOLLIN | LPOLLRDHUP);
1201 if (ret < 0) {
1202 goto error;
1203 }
1204
1205 health_code_update();
1206
1207 /* Infinite blocking call, waiting for transmission */
1208 restart_poll:
1209 while (1) {
1210 health_poll_entry();
1211 ret = lttng_poll_wait(&events, -1);
1212 health_poll_exit();
1213 if (ret < 0) {
1214 /*
1215 * Restart interrupted system call.
1216 */
1217 if (errno == EINTR) {
1218 goto restart_poll;
1219 }
1220 goto error;
1221 }
1222
1223 nb_fd = ret;
1224
1225 for (i = 0; i < nb_fd; i++) {
1226 /* Fetch once the poll data */
1227 revents = LTTNG_POLL_GETEV(&events, i);
1228 pollfd = LTTNG_POLL_GETFD(&events, i);
1229
1230 health_code_update();
1231
1232 /* Thread quit pipe has been closed. Killing thread. */
1233 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1234 if (ret) {
1235 err = 0;
1236 goto exit;
1237 }
1238
1239 if (pollfd == sock) {
1240 /* Event on the consumerd socket */
1241 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1242 ERR("consumer err socket second poll error");
1243 goto error;
1244 }
1245 health_code_update();
1246 /* Wait for any kconsumerd error */
1247 ret = lttcomm_recv_unix_sock(sock, &code,
1248 sizeof(enum lttcomm_return_code));
1249 if (ret <= 0) {
1250 ERR("consumer closed the command socket");
1251 goto error;
1252 }
1253
1254 ERR("consumer return code : %s",
1255 lttcomm_get_readable_code(-code));
1256
1257 goto exit;
1258 } else if (pollfd == consumer_data->metadata_fd) {
1259 /* UST metadata requests */
1260 ret = ust_consumer_metadata_request(
1261 &consumer_data->metadata_sock);
1262 if (ret < 0) {
1263 ERR("Handling metadata request");
1264 goto error;
1265 }
1266 break;
1267 } else {
1268 ERR("Unknown pollfd");
1269 goto error;
1270 }
1271 }
1272 health_code_update();
1273 }
1274
1275 exit:
1276 error:
1277 /*
1278 * We lock here because we are about to close the sockets and some other
1279 * thread might be using them so get exclusive access which will abort all
1280 * other consumer command by other threads.
1281 */
1282 pthread_mutex_lock(&consumer_data->lock);
1283
1284 /* Immediately set the consumerd state to stopped */
1285 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1286 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1287 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1288 consumer_data->type == LTTNG_CONSUMER32_UST) {
1289 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1290 } else {
1291 /* Code flow error... */
1292 assert(0);
1293 }
1294
1295 if (consumer_data->err_sock >= 0) {
1296 ret = close(consumer_data->err_sock);
1297 if (ret) {
1298 PERROR("close");
1299 }
1300 consumer_data->err_sock = -1;
1301 }
1302 if (consumer_data->cmd_sock >= 0) {
1303 ret = close(consumer_data->cmd_sock);
1304 if (ret) {
1305 PERROR("close");
1306 }
1307 consumer_data->cmd_sock = -1;
1308 }
1309 if (*consumer_data->metadata_sock.fd_ptr >= 0) {
1310 ret = close(*consumer_data->metadata_sock.fd_ptr);
1311 if (ret) {
1312 PERROR("close");
1313 }
1314 }
1315
1316 if (sock >= 0) {
1317 ret = close(sock);
1318 if (ret) {
1319 PERROR("close");
1320 }
1321 }
1322
1323 unlink(consumer_data->err_unix_sock_path);
1324 unlink(consumer_data->cmd_unix_sock_path);
1325 consumer_data->pid = 0;
1326 pthread_mutex_unlock(&consumer_data->lock);
1327
1328 /* Cleanup metadata socket mutex. */
1329 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1330 free(consumer_data->metadata_sock.lock);
1331
1332 lttng_poll_clean(&events);
1333 error_poll:
1334 if (err) {
1335 health_error();
1336 ERR("Health error occurred in %s", __func__);
1337 }
1338 health_unregister(health_sessiond);
1339 DBG("consumer thread cleanup completed");
1340
1341 return NULL;
1342 }
1343
1344 /*
1345 * This thread manage application communication.
1346 */
1347 static void *thread_manage_apps(void *data)
1348 {
1349 int i, ret, pollfd, err = -1;
1350 ssize_t size_ret;
1351 uint32_t revents, nb_fd;
1352 struct lttng_poll_event events;
1353
1354 DBG("[thread] Manage application started");
1355
1356 rcu_register_thread();
1357 rcu_thread_online();
1358
1359 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
1360
1361 if (testpoint(sessiond_thread_manage_apps)) {
1362 goto error_testpoint;
1363 }
1364
1365 health_code_update();
1366
1367 ret = sessiond_set_thread_pollset(&events, 2);
1368 if (ret < 0) {
1369 goto error_poll_create;
1370 }
1371
1372 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1373 if (ret < 0) {
1374 goto error;
1375 }
1376
1377 if (testpoint(sessiond_thread_manage_apps_before_loop)) {
1378 goto error;
1379 }
1380
1381 health_code_update();
1382
1383 while (1) {
1384 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
1385
1386 /* Inifinite blocking call, waiting for transmission */
1387 restart:
1388 health_poll_entry();
1389 ret = lttng_poll_wait(&events, -1);
1390 health_poll_exit();
1391 if (ret < 0) {
1392 /*
1393 * Restart interrupted system call.
1394 */
1395 if (errno == EINTR) {
1396 goto restart;
1397 }
1398 goto error;
1399 }
1400
1401 nb_fd = ret;
1402
1403 for (i = 0; i < nb_fd; i++) {
1404 /* Fetch once the poll data */
1405 revents = LTTNG_POLL_GETEV(&events, i);
1406 pollfd = LTTNG_POLL_GETFD(&events, i);
1407
1408 health_code_update();
1409
1410 /* Thread quit pipe has been closed. Killing thread. */
1411 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1412 if (ret) {
1413 err = 0;
1414 goto exit;
1415 }
1416
1417 /* Inspect the apps cmd pipe */
1418 if (pollfd == apps_cmd_pipe[0]) {
1419 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1420 ERR("Apps command pipe error");
1421 goto error;
1422 } else if (revents & LPOLLIN) {
1423 int sock;
1424
1425 /* Empty pipe */
1426 size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
1427 if (size_ret < sizeof(sock)) {
1428 PERROR("read apps cmd pipe");
1429 goto error;
1430 }
1431
1432 health_code_update();
1433
1434 /*
1435 * We only monitor the error events of the socket. This
1436 * thread does not handle any incoming data from UST
1437 * (POLLIN).
1438 */
1439 ret = lttng_poll_add(&events, sock,
1440 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1441 if (ret < 0) {
1442 goto error;
1443 }
1444
1445 DBG("Apps with sock %d added to poll set", sock);
1446 }
1447 } else {
1448 /*
1449 * At this point, we know that a registered application made
1450 * the event at poll_wait.
1451 */
1452 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1453 /* Removing from the poll set */
1454 ret = lttng_poll_del(&events, pollfd);
1455 if (ret < 0) {
1456 goto error;
1457 }
1458
1459 /* Socket closed on remote end. */
1460 ust_app_unregister(pollfd);
1461 }
1462 }
1463
1464 health_code_update();
1465 }
1466 }
1467
1468 exit:
1469 error:
1470 lttng_poll_clean(&events);
1471 error_poll_create:
1472 error_testpoint:
1473 utils_close_pipe(apps_cmd_pipe);
1474 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1475
1476 /*
1477 * We don't clean the UST app hash table here since already registered
1478 * applications can still be controlled so let them be until the session
1479 * daemon dies or the applications stop.
1480 */
1481
1482 if (err) {
1483 health_error();
1484 ERR("Health error occurred in %s", __func__);
1485 }
1486 health_unregister(health_sessiond);
1487 DBG("Application communication apps thread cleanup complete");
1488 rcu_thread_offline();
1489 rcu_unregister_thread();
1490 return NULL;
1491 }
1492
1493 /*
1494 * Send a socket to a thread This is called from the dispatch UST registration
1495 * thread once all sockets are set for the application.
1496 *
1497 * The sock value can be invalid, we don't really care, the thread will handle
1498 * it and make the necessary cleanup if so.
1499 *
1500 * On success, return 0 else a negative value being the errno message of the
1501 * write().
1502 */
1503 static int send_socket_to_thread(int fd, int sock)
1504 {
1505 ssize_t ret;
1506
1507 /*
1508 * It's possible that the FD is set as invalid with -1 concurrently just
1509 * before calling this function being a shutdown state of the thread.
1510 */
1511 if (fd < 0) {
1512 ret = -EBADF;
1513 goto error;
1514 }
1515
1516 ret = lttng_write(fd, &sock, sizeof(sock));
1517 if (ret < sizeof(sock)) {
1518 PERROR("write apps pipe %d", fd);
1519 if (ret < 0) {
1520 ret = -errno;
1521 }
1522 goto error;
1523 }
1524
1525 /* All good. Don't send back the write positive ret value. */
1526 ret = 0;
1527 error:
1528 return (int) ret;
1529 }
1530
1531 /*
1532 * Sanitize the wait queue of the dispatch registration thread meaning removing
1533 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1534 * notify socket is never received.
1535 */
1536 static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1537 {
1538 int ret, nb_fd = 0, i;
1539 unsigned int fd_added = 0;
1540 struct lttng_poll_event events;
1541 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1542
1543 assert(wait_queue);
1544
1545 lttng_poll_init(&events);
1546
1547 /* Just skip everything for an empty queue. */
1548 if (!wait_queue->count) {
1549 goto end;
1550 }
1551
1552 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1553 if (ret < 0) {
1554 goto error_create;
1555 }
1556
1557 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1558 &wait_queue->head, head) {
1559 assert(wait_node->app);
1560 ret = lttng_poll_add(&events, wait_node->app->sock,
1561 LPOLLHUP | LPOLLERR);
1562 if (ret < 0) {
1563 goto error;
1564 }
1565
1566 fd_added = 1;
1567 }
1568
1569 if (!fd_added) {
1570 goto end;
1571 }
1572
1573 /*
1574 * Poll but don't block so we can quickly identify the faulty events and
1575 * clean them afterwards from the wait queue.
1576 */
1577 ret = lttng_poll_wait(&events, 0);
1578 if (ret < 0) {
1579 goto error;
1580 }
1581 nb_fd = ret;
1582
1583 for (i = 0; i < nb_fd; i++) {
1584 /* Get faulty FD. */
1585 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1586 int pollfd = LTTNG_POLL_GETFD(&events, i);
1587
1588 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1589 &wait_queue->head, head) {
1590 if (pollfd == wait_node->app->sock &&
1591 (revents & (LPOLLHUP | LPOLLERR))) {
1592 cds_list_del(&wait_node->head);
1593 wait_queue->count--;
1594 ust_app_destroy(wait_node->app);
1595 free(wait_node);
1596 break;
1597 }
1598 }
1599 }
1600
1601 if (nb_fd > 0) {
1602 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1603 }
1604
1605 end:
1606 lttng_poll_clean(&events);
1607 return;
1608
1609 error:
1610 lttng_poll_clean(&events);
1611 error_create:
1612 ERR("Unable to sanitize wait queue");
1613 return;
1614 }
1615
1616 /*
1617 * Dispatch request from the registration threads to the application
1618 * communication thread.
1619 */
1620 static void *thread_dispatch_ust_registration(void *data)
1621 {
1622 int ret, err = -1;
1623 struct cds_wfq_node *node;
1624 struct ust_command *ust_cmd = NULL;
1625 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1626 struct ust_reg_wait_queue wait_queue = {
1627 .count = 0,
1628 };
1629
1630 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
1631
1632 health_code_update();
1633
1634 CDS_INIT_LIST_HEAD(&wait_queue.head);
1635
1636 DBG("[thread] Dispatch UST command started");
1637
1638 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
1639 health_code_update();
1640
1641 /* Atomically prepare the queue futex */
1642 futex_nto1_prepare(&ust_cmd_queue.futex);
1643
1644 do {
1645 struct ust_app *app = NULL;
1646 ust_cmd = NULL;
1647
1648 /*
1649 * Make sure we don't have node(s) that have hung up before receiving
1650 * the notify socket. This is to clean the list in order to avoid
1651 * memory leaks from notify socket that are never seen.
1652 */
1653 sanitize_wait_queue(&wait_queue);
1654
1655 health_code_update();
1656 /* Dequeue command for registration */
1657 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1658 if (node == NULL) {
1659 DBG("Woken up but nothing in the UST command queue");
1660 /* Continue thread execution */
1661 break;
1662 }
1663
1664 ust_cmd = caa_container_of(node, struct ust_command, node);
1665
1666 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1667 " gid:%d sock:%d name:%s (version %d.%d)",
1668 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1669 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1670 ust_cmd->sock, ust_cmd->reg_msg.name,
1671 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1672
1673 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1674 wait_node = zmalloc(sizeof(*wait_node));
1675 if (!wait_node) {
1676 PERROR("zmalloc wait_node dispatch");
1677 ret = close(ust_cmd->sock);
1678 if (ret < 0) {
1679 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1680 }
1681 lttng_fd_put(LTTNG_FD_APPS, 1);
1682 free(ust_cmd);
1683 goto error;
1684 }
1685 CDS_INIT_LIST_HEAD(&wait_node->head);
1686
1687 /* Create application object if socket is CMD. */
1688 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1689 ust_cmd->sock);
1690 if (!wait_node->app) {
1691 ret = close(ust_cmd->sock);
1692 if (ret < 0) {
1693 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1694 }
1695 lttng_fd_put(LTTNG_FD_APPS, 1);
1696 free(wait_node);
1697 free(ust_cmd);
1698 continue;
1699 }
1700 /*
1701 * Add application to the wait queue so we can set the notify
1702 * socket before putting this object in the global ht.
1703 */
1704 cds_list_add(&wait_node->head, &wait_queue.head);
1705 wait_queue.count++;
1706
1707 free(ust_cmd);
1708 /*
1709 * We have to continue here since we don't have the notify
1710 * socket and the application MUST be added to the hash table
1711 * only at that moment.
1712 */
1713 continue;
1714 } else {
1715 /*
1716 * Look for the application in the local wait queue and set the
1717 * notify socket if found.
1718 */
1719 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1720 &wait_queue.head, head) {
1721 health_code_update();
1722 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1723 wait_node->app->notify_sock = ust_cmd->sock;
1724 cds_list_del(&wait_node->head);
1725 wait_queue.count--;
1726 app = wait_node->app;
1727 free(wait_node);
1728 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1729 break;
1730 }
1731 }
1732
1733 /*
1734 * With no application at this stage the received socket is
1735 * basically useless so close it before we free the cmd data
1736 * structure for good.
1737 */
1738 if (!app) {
1739 ret = close(ust_cmd->sock);
1740 if (ret < 0) {
1741 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1742 }
1743 lttng_fd_put(LTTNG_FD_APPS, 1);
1744 }
1745 free(ust_cmd);
1746 }
1747
1748 if (app) {
1749 /*
1750 * @session_lock_list
1751 *
1752 * Lock the global session list so from the register up to the
1753 * registration done message, no thread can see the application
1754 * and change its state.
1755 */
1756 session_lock_list();
1757 rcu_read_lock();
1758
1759 /*
1760 * Add application to the global hash table. This needs to be
1761 * done before the update to the UST registry can locate the
1762 * application.
1763 */
1764 ust_app_add(app);
1765
1766 /* Set app version. This call will print an error if needed. */
1767 (void) ust_app_version(app);
1768
1769 /* Send notify socket through the notify pipe. */
1770 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1771 app->notify_sock);
1772 if (ret < 0) {
1773 rcu_read_unlock();
1774 session_unlock_list();
1775 /*
1776 * No notify thread, stop the UST tracing. However, this is
1777 * not an internal error of the this thread thus setting
1778 * the health error code to a normal exit.
1779 */
1780 err = 0;
1781 goto error;
1782 }
1783
1784 /*
1785 * Update newly registered application with the tracing
1786 * registry info already enabled information.
1787 */
1788 update_ust_app(app->sock);
1789
1790 /*
1791 * Don't care about return value. Let the manage apps threads
1792 * handle app unregistration upon socket close.
1793 */
1794 (void) ust_app_register_done(app->sock);
1795
1796 /*
1797 * Even if the application socket has been closed, send the app
1798 * to the thread and unregistration will take place at that
1799 * place.
1800 */
1801 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
1802 if (ret < 0) {
1803 rcu_read_unlock();
1804 session_unlock_list();
1805 /*
1806 * No apps. thread, stop the UST tracing. However, this is
1807 * not an internal error of the this thread thus setting
1808 * the health error code to a normal exit.
1809 */
1810 err = 0;
1811 goto error;
1812 }
1813
1814 rcu_read_unlock();
1815 session_unlock_list();
1816 }
1817 } while (node != NULL);
1818
1819 health_poll_entry();
1820 /* Futex wait on queue. Blocking call on futex() */
1821 futex_nto1_wait(&ust_cmd_queue.futex);
1822 health_poll_exit();
1823 }
1824 /* Normal exit, no error */
1825 err = 0;
1826
1827 error:
1828 /* Clean up wait queue. */
1829 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1830 &wait_queue.head, head) {
1831 cds_list_del(&wait_node->head);
1832 wait_queue.count--;
1833 free(wait_node);
1834 }
1835
1836 DBG("Dispatch thread dying");
1837 if (err) {
1838 health_error();
1839 ERR("Health error occurred in %s", __func__);
1840 }
1841 health_unregister(health_sessiond);
1842 return NULL;
1843 }
1844
1845 /*
1846 * This thread manage application registration.
1847 */
1848 static void *thread_registration_apps(void *data)
1849 {
1850 int sock = -1, i, ret, pollfd, err = -1;
1851 uint32_t revents, nb_fd;
1852 struct lttng_poll_event events;
1853 /*
1854 * Get allocated in this thread, enqueued to a global queue, dequeued and
1855 * freed in the manage apps thread.
1856 */
1857 struct ust_command *ust_cmd = NULL;
1858
1859 DBG("[thread] Manage application registration started");
1860
1861 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
1862
1863 if (testpoint(sessiond_thread_registration_apps)) {
1864 goto error_testpoint;
1865 }
1866
1867 ret = lttcomm_listen_unix_sock(apps_sock);
1868 if (ret < 0) {
1869 goto error_listen;
1870 }
1871
1872 /*
1873 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1874 * more will be added to this poll set.
1875 */
1876 ret = sessiond_set_thread_pollset(&events, 2);
1877 if (ret < 0) {
1878 goto error_create_poll;
1879 }
1880
1881 /* Add the application registration socket */
1882 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1883 if (ret < 0) {
1884 goto error_poll_add;
1885 }
1886
1887 /* Notify all applications to register */
1888 ret = notify_ust_apps(1);
1889 if (ret < 0) {
1890 ERR("Failed to notify applications or create the wait shared memory.\n"
1891 "Execution continues but there might be problem for already\n"
1892 "running applications that wishes to register.");
1893 }
1894
1895 while (1) {
1896 DBG("Accepting application registration");
1897
1898 /* Inifinite blocking call, waiting for transmission */
1899 restart:
1900 health_poll_entry();
1901 ret = lttng_poll_wait(&events, -1);
1902 health_poll_exit();
1903 if (ret < 0) {
1904 /*
1905 * Restart interrupted system call.
1906 */
1907 if (errno == EINTR) {
1908 goto restart;
1909 }
1910 goto error;
1911 }
1912
1913 nb_fd = ret;
1914
1915 for (i = 0; i < nb_fd; i++) {
1916 health_code_update();
1917
1918 /* Fetch once the poll data */
1919 revents = LTTNG_POLL_GETEV(&events, i);
1920 pollfd = LTTNG_POLL_GETFD(&events, i);
1921
1922 /* Thread quit pipe has been closed. Killing thread. */
1923 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1924 if (ret) {
1925 err = 0;
1926 goto exit;
1927 }
1928
1929 /* Event on the registration socket */
1930 if (pollfd == apps_sock) {
1931 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1932 ERR("Register apps socket poll error");
1933 goto error;
1934 } else if (revents & LPOLLIN) {
1935 sock = lttcomm_accept_unix_sock(apps_sock);
1936 if (sock < 0) {
1937 goto error;
1938 }
1939
1940 /*
1941 * Set socket timeout for both receiving and ending.
1942 * app_socket_timeout is in seconds, whereas
1943 * lttcomm_setsockopt_rcv_timeout and
1944 * lttcomm_setsockopt_snd_timeout expect msec as
1945 * parameter.
1946 */
1947 (void) lttcomm_setsockopt_rcv_timeout(sock,
1948 app_socket_timeout * 1000);
1949 (void) lttcomm_setsockopt_snd_timeout(sock,
1950 app_socket_timeout * 1000);
1951
1952 /*
1953 * Set the CLOEXEC flag. Return code is useless because
1954 * either way, the show must go on.
1955 */
1956 (void) utils_set_fd_cloexec(sock);
1957
1958 /* Create UST registration command for enqueuing */
1959 ust_cmd = zmalloc(sizeof(struct ust_command));
1960 if (ust_cmd == NULL) {
1961 PERROR("ust command zmalloc");
1962 goto error;
1963 }
1964
1965 /*
1966 * Using message-based transmissions to ensure we don't
1967 * have to deal with partially received messages.
1968 */
1969 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1970 if (ret < 0) {
1971 ERR("Exhausted file descriptors allowed for applications.");
1972 free(ust_cmd);
1973 ret = close(sock);
1974 if (ret) {
1975 PERROR("close");
1976 }
1977 sock = -1;
1978 continue;
1979 }
1980
1981 health_code_update();
1982 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
1983 if (ret < 0) {
1984 free(ust_cmd);
1985 /* Close socket of the application. */
1986 ret = close(sock);
1987 if (ret) {
1988 PERROR("close");
1989 }
1990 lttng_fd_put(LTTNG_FD_APPS, 1);
1991 sock = -1;
1992 continue;
1993 }
1994 health_code_update();
1995
1996 ust_cmd->sock = sock;
1997 sock = -1;
1998
1999 DBG("UST registration received with pid:%d ppid:%d uid:%d"
2000 " gid:%d sock:%d name:%s (version %d.%d)",
2001 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
2002 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
2003 ust_cmd->sock, ust_cmd->reg_msg.name,
2004 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
2005
2006 /*
2007 * Lock free enqueue the registration request. The red pill
2008 * has been taken! This apps will be part of the *system*.
2009 */
2010 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
2011
2012 /*
2013 * Wake the registration queue futex. Implicit memory
2014 * barrier with the exchange in cds_wfq_enqueue.
2015 */
2016 futex_nto1_wake(&ust_cmd_queue.futex);
2017 }
2018 }
2019 }
2020 }
2021
2022 exit:
2023 error:
2024 if (err) {
2025 health_error();
2026 ERR("Health error occurred in %s", __func__);
2027 }
2028
2029 /* Notify that the registration thread is gone */
2030 notify_ust_apps(0);
2031
2032 if (apps_sock >= 0) {
2033 ret = close(apps_sock);
2034 if (ret) {
2035 PERROR("close");
2036 }
2037 }
2038 if (sock >= 0) {
2039 ret = close(sock);
2040 if (ret) {
2041 PERROR("close");
2042 }
2043 lttng_fd_put(LTTNG_FD_APPS, 1);
2044 }
2045 unlink(apps_unix_sock_path);
2046
2047 error_poll_add:
2048 lttng_poll_clean(&events);
2049 error_listen:
2050 error_create_poll:
2051 error_testpoint:
2052 DBG("UST Registration thread cleanup complete");
2053 health_unregister(health_sessiond);
2054
2055 return NULL;
2056 }
2057
2058 /*
2059 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2060 * exec or it will fails.
2061 */
2062 static int spawn_consumer_thread(struct consumer_data *consumer_data)
2063 {
2064 int ret, clock_ret;
2065 struct timespec timeout;
2066
2067 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2068 consumer_data->consumer_thread_is_ready = 0;
2069
2070 /* Setup pthread condition */
2071 ret = pthread_condattr_init(&consumer_data->condattr);
2072 if (ret != 0) {
2073 errno = ret;
2074 PERROR("pthread_condattr_init consumer data");
2075 goto error;
2076 }
2077
2078 /*
2079 * Set the monotonic clock in order to make sure we DO NOT jump in time
2080 * between the clock_gettime() call and the timedwait call. See bug #324
2081 * for a more details and how we noticed it.
2082 */
2083 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
2084 if (ret != 0) {
2085 errno = ret;
2086 PERROR("pthread_condattr_setclock consumer data");
2087 goto error;
2088 }
2089
2090 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
2091 if (ret != 0) {
2092 errno = ret;
2093 PERROR("pthread_cond_init consumer data");
2094 goto error;
2095 }
2096
2097 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
2098 consumer_data);
2099 if (ret != 0) {
2100 PERROR("pthread_create consumer");
2101 ret = -1;
2102 goto error;
2103 }
2104
2105 /* We are about to wait on a pthread condition */
2106 pthread_mutex_lock(&consumer_data->cond_mutex);
2107
2108 /* Get time for sem_timedwait absolute timeout */
2109 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
2110 /*
2111 * Set the timeout for the condition timed wait even if the clock gettime
2112 * call fails since we might loop on that call and we want to avoid to
2113 * increment the timeout too many times.
2114 */
2115 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
2116
2117 /*
2118 * The following loop COULD be skipped in some conditions so this is why we
2119 * set ret to 0 in order to make sure at least one round of the loop is
2120 * done.
2121 */
2122 ret = 0;
2123
2124 /*
2125 * Loop until the condition is reached or when a timeout is reached. Note
2126 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2127 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2128 * possible. This loop does not take any chances and works with both of
2129 * them.
2130 */
2131 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
2132 if (clock_ret < 0) {
2133 PERROR("clock_gettime spawn consumer");
2134 /* Infinite wait for the consumerd thread to be ready */
2135 ret = pthread_cond_wait(&consumer_data->cond,
2136 &consumer_data->cond_mutex);
2137 } else {
2138 ret = pthread_cond_timedwait(&consumer_data->cond,
2139 &consumer_data->cond_mutex, &timeout);
2140 }
2141 }
2142
2143 /* Release the pthread condition */
2144 pthread_mutex_unlock(&consumer_data->cond_mutex);
2145
2146 if (ret != 0) {
2147 errno = ret;
2148 if (ret == ETIMEDOUT) {
2149 /*
2150 * Call has timed out so we kill the kconsumerd_thread and return
2151 * an error.
2152 */
2153 ERR("Condition timed out. The consumer thread was never ready."
2154 " Killing it");
2155 ret = pthread_cancel(consumer_data->thread);
2156 if (ret < 0) {
2157 PERROR("pthread_cancel consumer thread");
2158 }
2159 } else {
2160 PERROR("pthread_cond_wait failed consumer thread");
2161 }
2162 goto error;
2163 }
2164
2165 pthread_mutex_lock(&consumer_data->pid_mutex);
2166 if (consumer_data->pid == 0) {
2167 ERR("Consumerd did not start");
2168 pthread_mutex_unlock(&consumer_data->pid_mutex);
2169 goto error;
2170 }
2171 pthread_mutex_unlock(&consumer_data->pid_mutex);
2172
2173 return 0;
2174
2175 error:
2176 return ret;
2177 }
2178
2179 /*
2180 * Join consumer thread
2181 */
2182 static int join_consumer_thread(struct consumer_data *consumer_data)
2183 {
2184 void *status;
2185
2186 /* Consumer pid must be a real one. */
2187 if (consumer_data->pid > 0) {
2188 int ret;
2189 ret = kill(consumer_data->pid, SIGTERM);
2190 if (ret) {
2191 ERR("Error killing consumer daemon");
2192 return ret;
2193 }
2194 return pthread_join(consumer_data->thread, &status);
2195 } else {
2196 return 0;
2197 }
2198 }
2199
2200 /*
2201 * Fork and exec a consumer daemon (consumerd).
2202 *
2203 * Return pid if successful else -1.
2204 */
2205 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
2206 {
2207 int ret;
2208 pid_t pid;
2209 const char *consumer_to_use;
2210 const char *verbosity;
2211 struct stat st;
2212
2213 DBG("Spawning consumerd");
2214
2215 pid = fork();
2216 if (pid == 0) {
2217 /*
2218 * Exec consumerd.
2219 */
2220 if (opt_verbose_consumer) {
2221 verbosity = "--verbose";
2222 } else {
2223 verbosity = "--quiet";
2224 }
2225 switch (consumer_data->type) {
2226 case LTTNG_CONSUMER_KERNEL:
2227 /*
2228 * Find out which consumerd to execute. We will first try the
2229 * 64-bit path, then the sessiond's installation directory, and
2230 * fallback on the 32-bit one,
2231 */
2232 DBG3("Looking for a kernel consumer at these locations:");
2233 DBG3(" 1) %s", consumerd64_bin);
2234 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
2235 DBG3(" 3) %s", consumerd32_bin);
2236 if (stat(consumerd64_bin, &st) == 0) {
2237 DBG3("Found location #1");
2238 consumer_to_use = consumerd64_bin;
2239 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
2240 DBG3("Found location #2");
2241 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
2242 } else if (stat(consumerd32_bin, &st) == 0) {
2243 DBG3("Found location #3");
2244 consumer_to_use = consumerd32_bin;
2245 } else {
2246 DBG("Could not find any valid consumerd executable");
2247 break;
2248 }
2249 DBG("Using kernel consumer at: %s", consumer_to_use);
2250 execl(consumer_to_use,
2251 "lttng-consumerd", verbosity, "-k",
2252 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2253 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2254 "--group", tracing_group_name,
2255 NULL);
2256 break;
2257 case LTTNG_CONSUMER64_UST:
2258 {
2259 char *tmpnew = NULL;
2260
2261 if (consumerd64_libdir[0] != '\0') {
2262 char *tmp;
2263 size_t tmplen;
2264
2265 tmp = getenv("LD_LIBRARY_PATH");
2266 if (!tmp) {
2267 tmp = "";
2268 }
2269 tmplen = strlen("LD_LIBRARY_PATH=")
2270 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
2271 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2272 if (!tmpnew) {
2273 ret = -ENOMEM;
2274 goto error;
2275 }
2276 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2277 strcat(tmpnew, consumerd64_libdir);
2278 if (tmp[0] != '\0') {
2279 strcat(tmpnew, ":");
2280 strcat(tmpnew, tmp);
2281 }
2282 ret = putenv(tmpnew);
2283 if (ret) {
2284 ret = -errno;
2285 free(tmpnew);
2286 goto error;
2287 }
2288 }
2289 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
2290 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
2291 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2292 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2293 "--group", tracing_group_name,
2294 NULL);
2295 if (consumerd64_libdir[0] != '\0') {
2296 free(tmpnew);
2297 }
2298 if (ret) {
2299 goto error;
2300 }
2301 break;
2302 }
2303 case LTTNG_CONSUMER32_UST:
2304 {
2305 char *tmpnew = NULL;
2306
2307 if (consumerd32_libdir[0] != '\0') {
2308 char *tmp;
2309 size_t tmplen;
2310
2311 tmp = getenv("LD_LIBRARY_PATH");
2312 if (!tmp) {
2313 tmp = "";
2314 }
2315 tmplen = strlen("LD_LIBRARY_PATH=")
2316 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
2317 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2318 if (!tmpnew) {
2319 ret = -ENOMEM;
2320 goto error;
2321 }
2322 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2323 strcat(tmpnew, consumerd32_libdir);
2324 if (tmp[0] != '\0') {
2325 strcat(tmpnew, ":");
2326 strcat(tmpnew, tmp);
2327 }
2328 ret = putenv(tmpnew);
2329 if (ret) {
2330 ret = -errno;
2331 free(tmpnew);
2332 goto error;
2333 }
2334 }
2335 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
2336 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
2337 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2338 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2339 "--group", tracing_group_name,
2340 NULL);
2341 if (consumerd32_libdir[0] != '\0') {
2342 free(tmpnew);
2343 }
2344 if (ret) {
2345 goto error;
2346 }
2347 break;
2348 }
2349 default:
2350 PERROR("unknown consumer type");
2351 exit(EXIT_FAILURE);
2352 }
2353 if (errno != 0) {
2354 PERROR("kernel start consumer exec");
2355 }
2356 exit(EXIT_FAILURE);
2357 } else if (pid > 0) {
2358 ret = pid;
2359 } else {
2360 PERROR("start consumer fork");
2361 ret = -errno;
2362 }
2363 error:
2364 return ret;
2365 }
2366
2367 /*
2368 * Spawn the consumerd daemon and session daemon thread.
2369 */
2370 static int start_consumerd(struct consumer_data *consumer_data)
2371 {
2372 int ret;
2373
2374 /*
2375 * Set the listen() state on the socket since there is a possible race
2376 * between the exec() of the consumer daemon and this call if place in the
2377 * consumer thread. See bug #366 for more details.
2378 */
2379 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2380 if (ret < 0) {
2381 goto error;
2382 }
2383
2384 pthread_mutex_lock(&consumer_data->pid_mutex);
2385 if (consumer_data->pid != 0) {
2386 pthread_mutex_unlock(&consumer_data->pid_mutex);
2387 goto end;
2388 }
2389
2390 ret = spawn_consumerd(consumer_data);
2391 if (ret < 0) {
2392 ERR("Spawning consumerd failed");
2393 pthread_mutex_unlock(&consumer_data->pid_mutex);
2394 goto error;
2395 }
2396
2397 /* Setting up the consumer_data pid */
2398 consumer_data->pid = ret;
2399 DBG2("Consumer pid %d", consumer_data->pid);
2400 pthread_mutex_unlock(&consumer_data->pid_mutex);
2401
2402 DBG2("Spawning consumer control thread");
2403 ret = spawn_consumer_thread(consumer_data);
2404 if (ret < 0) {
2405 ERR("Fatal error spawning consumer control thread");
2406 goto error;
2407 }
2408
2409 end:
2410 return 0;
2411
2412 error:
2413 /* Cleanup already created sockets on error. */
2414 if (consumer_data->err_sock >= 0) {
2415 int err;
2416
2417 err = close(consumer_data->err_sock);
2418 if (err < 0) {
2419 PERROR("close consumer data error socket");
2420 }
2421 }
2422 return ret;
2423 }
2424
2425 /*
2426 * Setup necessary data for kernel tracer action.
2427 */
2428 static int init_kernel_tracer(void)
2429 {
2430 int ret;
2431
2432 /* Modprobe lttng kernel modules */
2433 ret = modprobe_lttng_control();
2434 if (ret < 0) {
2435 goto error;
2436 }
2437
2438 /* Open debugfs lttng */
2439 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2440 if (kernel_tracer_fd < 0) {
2441 DBG("Failed to open %s", module_proc_lttng);
2442 ret = -1;
2443 goto error_open;
2444 }
2445
2446 /* Validate kernel version */
2447 ret = kernel_validate_version(kernel_tracer_fd);
2448 if (ret < 0) {
2449 goto error_version;
2450 }
2451
2452 ret = modprobe_lttng_data();
2453 if (ret < 0) {
2454 goto error_modules;
2455 }
2456
2457 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2458 return 0;
2459
2460 error_version:
2461 modprobe_remove_lttng_control();
2462 ret = close(kernel_tracer_fd);
2463 if (ret) {
2464 PERROR("close");
2465 }
2466 kernel_tracer_fd = -1;
2467 return LTTNG_ERR_KERN_VERSION;
2468
2469 error_modules:
2470 ret = close(kernel_tracer_fd);
2471 if (ret) {
2472 PERROR("close");
2473 }
2474
2475 error_open:
2476 modprobe_remove_lttng_control();
2477
2478 error:
2479 WARN("No kernel tracer available");
2480 kernel_tracer_fd = -1;
2481 if (!is_root) {
2482 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2483 } else {
2484 return LTTNG_ERR_KERN_NA;
2485 }
2486 }
2487
2488
2489 /*
2490 * Copy consumer output from the tracing session to the domain session. The
2491 * function also applies the right modification on a per domain basis for the
2492 * trace files destination directory.
2493 *
2494 * Should *NOT* be called with RCU read-side lock held.
2495 */
2496 static int copy_session_consumer(int domain, struct ltt_session *session)
2497 {
2498 int ret;
2499 const char *dir_name;
2500 struct consumer_output *consumer;
2501
2502 assert(session);
2503 assert(session->consumer);
2504
2505 switch (domain) {
2506 case LTTNG_DOMAIN_KERNEL:
2507 DBG3("Copying tracing session consumer output in kernel session");
2508 /*
2509 * XXX: We should audit the session creation and what this function
2510 * does "extra" in order to avoid a destroy since this function is used
2511 * in the domain session creation (kernel and ust) only. Same for UST
2512 * domain.
2513 */
2514 if (session->kernel_session->consumer) {
2515 consumer_destroy_output(session->kernel_session->consumer);
2516 }
2517 session->kernel_session->consumer =
2518 consumer_copy_output(session->consumer);
2519 /* Ease our life a bit for the next part */
2520 consumer = session->kernel_session->consumer;
2521 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2522 break;
2523 case LTTNG_DOMAIN_JUL:
2524 case LTTNG_DOMAIN_UST:
2525 DBG3("Copying tracing session consumer output in UST session");
2526 if (session->ust_session->consumer) {
2527 consumer_destroy_output(session->ust_session->consumer);
2528 }
2529 session->ust_session->consumer =
2530 consumer_copy_output(session->consumer);
2531 /* Ease our life a bit for the next part */
2532 consumer = session->ust_session->consumer;
2533 dir_name = DEFAULT_UST_TRACE_DIR;
2534 break;
2535 default:
2536 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2537 goto error;
2538 }
2539
2540 /* Append correct directory to subdir */
2541 strncat(consumer->subdir, dir_name,
2542 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2543 DBG3("Copy session consumer subdir %s", consumer->subdir);
2544
2545 ret = LTTNG_OK;
2546
2547 error:
2548 return ret;
2549 }
2550
2551 /*
2552 * Create an UST session and add it to the session ust list.
2553 *
2554 * Should *NOT* be called with RCU read-side lock held.
2555 */
2556 static int create_ust_session(struct ltt_session *session,
2557 struct lttng_domain *domain)
2558 {
2559 int ret;
2560 struct ltt_ust_session *lus = NULL;
2561
2562 assert(session);
2563 assert(domain);
2564 assert(session->consumer);
2565
2566 switch (domain->type) {
2567 case LTTNG_DOMAIN_JUL:
2568 case LTTNG_DOMAIN_UST:
2569 break;
2570 default:
2571 ERR("Unknown UST domain on create session %d", domain->type);
2572 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2573 goto error;
2574 }
2575
2576 DBG("Creating UST session");
2577
2578 lus = trace_ust_create_session(session->id);
2579 if (lus == NULL) {
2580 ret = LTTNG_ERR_UST_SESS_FAIL;
2581 goto error;
2582 }
2583
2584 lus->uid = session->uid;
2585 lus->gid = session->gid;
2586 lus->output_traces = session->output_traces;
2587 lus->snapshot_mode = session->snapshot_mode;
2588 lus->live_timer_interval = session->live_timer;
2589 session->ust_session = lus;
2590
2591 /* Copy session output to the newly created UST session */
2592 ret = copy_session_consumer(domain->type, session);
2593 if (ret != LTTNG_OK) {
2594 goto error;
2595 }
2596
2597 return LTTNG_OK;
2598
2599 error:
2600 free(lus);
2601 session->ust_session = NULL;
2602 return ret;
2603 }
2604
2605 /*
2606 * Create a kernel tracer session then create the default channel.
2607 */
2608 static int create_kernel_session(struct ltt_session *session)
2609 {
2610 int ret;
2611
2612 DBG("Creating kernel session");
2613
2614 ret = kernel_create_session(session, kernel_tracer_fd);
2615 if (ret < 0) {
2616 ret = LTTNG_ERR_KERN_SESS_FAIL;
2617 goto error;
2618 }
2619
2620 /* Code flow safety */
2621 assert(session->kernel_session);
2622
2623 /* Copy session output to the newly created Kernel session */
2624 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2625 if (ret != LTTNG_OK) {
2626 goto error;
2627 }
2628
2629 /* Create directory(ies) on local filesystem. */
2630 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2631 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2632 ret = run_as_mkdir_recursive(
2633 session->kernel_session->consumer->dst.trace_path,
2634 S_IRWXU | S_IRWXG, session->uid, session->gid);
2635 if (ret < 0) {
2636 if (ret != -EEXIST) {
2637 ERR("Trace directory creation error");
2638 goto error;
2639 }
2640 }
2641 }
2642
2643 session->kernel_session->uid = session->uid;
2644 session->kernel_session->gid = session->gid;
2645 session->kernel_session->output_traces = session->output_traces;
2646 session->kernel_session->snapshot_mode = session->snapshot_mode;
2647
2648 return LTTNG_OK;
2649
2650 error:
2651 trace_kernel_destroy_session(session->kernel_session);
2652 session->kernel_session = NULL;
2653 return ret;
2654 }
2655
2656 /*
2657 * Count number of session permitted by uid/gid.
2658 */
2659 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2660 {
2661 unsigned int i = 0;
2662 struct ltt_session *session;
2663
2664 DBG("Counting number of available session for UID %d GID %d",
2665 uid, gid);
2666 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2667 /*
2668 * Only list the sessions the user can control.
2669 */
2670 if (!session_access_ok(session, uid, gid)) {
2671 continue;
2672 }
2673 i++;
2674 }
2675 return i;
2676 }
2677
2678 /*
2679 * Process the command requested by the lttng client within the command
2680 * context structure. This function make sure that the return structure (llm)
2681 * is set and ready for transmission before returning.
2682 *
2683 * Return any error encountered or 0 for success.
2684 *
2685 * "sock" is only used for special-case var. len data.
2686 *
2687 * Should *NOT* be called with RCU read-side lock held.
2688 */
2689 static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2690 int *sock_error)
2691 {
2692 int ret = LTTNG_OK;
2693 int need_tracing_session = 1;
2694 int need_domain;
2695
2696 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2697
2698 *sock_error = 0;
2699
2700 switch (cmd_ctx->lsm->cmd_type) {
2701 case LTTNG_CREATE_SESSION:
2702 case LTTNG_CREATE_SESSION_SNAPSHOT:
2703 case LTTNG_CREATE_SESSION_LIVE:
2704 case LTTNG_DESTROY_SESSION:
2705 case LTTNG_LIST_SESSIONS:
2706 case LTTNG_LIST_DOMAINS:
2707 case LTTNG_START_TRACE:
2708 case LTTNG_STOP_TRACE:
2709 case LTTNG_DATA_PENDING:
2710 case LTTNG_SNAPSHOT_ADD_OUTPUT:
2711 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2712 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2713 case LTTNG_SNAPSHOT_RECORD:
2714 need_domain = 0;
2715 break;
2716 default:
2717 need_domain = 1;
2718 }
2719
2720 if (opt_no_kernel && need_domain
2721 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
2722 if (!is_root) {
2723 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2724 } else {
2725 ret = LTTNG_ERR_KERN_NA;
2726 }
2727 goto error;
2728 }
2729
2730 /* Deny register consumer if we already have a spawned consumer. */
2731 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2732 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2733 if (kconsumer_data.pid > 0) {
2734 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2735 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2736 goto error;
2737 }
2738 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2739 }
2740
2741 /*
2742 * Check for command that don't needs to allocate a returned payload. We do
2743 * this here so we don't have to make the call for no payload at each
2744 * command.
2745 */
2746 switch(cmd_ctx->lsm->cmd_type) {
2747 case LTTNG_LIST_SESSIONS:
2748 case LTTNG_LIST_TRACEPOINTS:
2749 case LTTNG_LIST_TRACEPOINT_FIELDS:
2750 case LTTNG_LIST_DOMAINS:
2751 case LTTNG_LIST_CHANNELS:
2752 case LTTNG_LIST_EVENTS:
2753 break;
2754 default:
2755 /* Setup lttng message with no payload */
2756 ret = setup_lttng_msg(cmd_ctx, 0);
2757 if (ret < 0) {
2758 /* This label does not try to unlock the session */
2759 goto init_setup_error;
2760 }
2761 }
2762
2763 /* Commands that DO NOT need a session. */
2764 switch (cmd_ctx->lsm->cmd_type) {
2765 case LTTNG_CREATE_SESSION:
2766 case LTTNG_CREATE_SESSION_SNAPSHOT:
2767 case LTTNG_CREATE_SESSION_LIVE:
2768 case LTTNG_CALIBRATE:
2769 case LTTNG_LIST_SESSIONS:
2770 case LTTNG_LIST_TRACEPOINTS:
2771 case LTTNG_LIST_TRACEPOINT_FIELDS:
2772 need_tracing_session = 0;
2773 break;
2774 default:
2775 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2776 /*
2777 * We keep the session list lock across _all_ commands
2778 * for now, because the per-session lock does not
2779 * handle teardown properly.
2780 */
2781 session_lock_list();
2782 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2783 if (cmd_ctx->session == NULL) {
2784 ret = LTTNG_ERR_SESS_NOT_FOUND;
2785 goto error;
2786 } else {
2787 /* Acquire lock for the session */
2788 session_lock(cmd_ctx->session);
2789 }
2790 break;
2791 }
2792
2793 if (!need_domain) {
2794 goto skip_domain;
2795 }
2796
2797 /*
2798 * Check domain type for specific "pre-action".
2799 */
2800 switch (cmd_ctx->lsm->domain.type) {
2801 case LTTNG_DOMAIN_KERNEL:
2802 if (!is_root) {
2803 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2804 goto error;
2805 }
2806
2807 /* Kernel tracer check */
2808 if (kernel_tracer_fd == -1) {
2809 /* Basically, load kernel tracer modules */
2810 ret = init_kernel_tracer();
2811 if (ret != 0) {
2812 goto error;
2813 }
2814 }
2815
2816 /* Consumer is in an ERROR state. Report back to client */
2817 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
2818 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2819 goto error;
2820 }
2821
2822 /* Need a session for kernel command */
2823 if (need_tracing_session) {
2824 if (cmd_ctx->session->kernel_session == NULL) {
2825 ret = create_kernel_session(cmd_ctx->session);
2826 if (ret < 0) {
2827 ret = LTTNG_ERR_KERN_SESS_FAIL;
2828 goto error;
2829 }
2830 }
2831
2832 /* Start the kernel consumer daemon */
2833 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2834 if (kconsumer_data.pid == 0 &&
2835 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2836 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2837 ret = start_consumerd(&kconsumer_data);
2838 if (ret < 0) {
2839 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2840 goto error;
2841 }
2842 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
2843 } else {
2844 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2845 }
2846
2847 /*
2848 * The consumer was just spawned so we need to add the socket to
2849 * the consumer output of the session if exist.
2850 */
2851 ret = consumer_create_socket(&kconsumer_data,
2852 cmd_ctx->session->kernel_session->consumer);
2853 if (ret < 0) {
2854 goto error;
2855 }
2856 }
2857
2858 break;
2859 case LTTNG_DOMAIN_JUL:
2860 case LTTNG_DOMAIN_UST:
2861 {
2862 if (!ust_app_supported()) {
2863 ret = LTTNG_ERR_NO_UST;
2864 goto error;
2865 }
2866 /* Consumer is in an ERROR state. Report back to client */
2867 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
2868 ret = LTTNG_ERR_NO_USTCONSUMERD;
2869 goto error;
2870 }
2871
2872 if (need_tracing_session) {
2873 /* Create UST session if none exist. */
2874 if (cmd_ctx->session->ust_session == NULL) {
2875 ret = create_ust_session(cmd_ctx->session,
2876 &cmd_ctx->lsm->domain);
2877 if (ret != LTTNG_OK) {
2878 goto error;
2879 }
2880 }
2881
2882 /* Start the UST consumer daemons */
2883 /* 64-bit */
2884 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
2885 if (consumerd64_bin[0] != '\0' &&
2886 ustconsumer64_data.pid == 0 &&
2887 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2888 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2889 ret = start_consumerd(&ustconsumer64_data);
2890 if (ret < 0) {
2891 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
2892 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2893 goto error;
2894 }
2895
2896 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
2897 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2898 } else {
2899 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2900 }
2901
2902 /*
2903 * Setup socket for consumer 64 bit. No need for atomic access
2904 * since it was set above and can ONLY be set in this thread.
2905 */
2906 ret = consumer_create_socket(&ustconsumer64_data,
2907 cmd_ctx->session->ust_session->consumer);
2908 if (ret < 0) {
2909 goto error;
2910 }
2911
2912 /* 32-bit */
2913 if (consumerd32_bin[0] != '\0' &&
2914 ustconsumer32_data.pid == 0 &&
2915 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2916 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2917 ret = start_consumerd(&ustconsumer32_data);
2918 if (ret < 0) {
2919 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
2920 uatomic_set(&ust_consumerd32_fd, -EINVAL);
2921 goto error;
2922 }
2923
2924 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
2925 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2926 } else {
2927 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2928 }
2929
2930 /*
2931 * Setup socket for consumer 64 bit. No need for atomic access
2932 * since it was set above and can ONLY be set in this thread.
2933 */
2934 ret = consumer_create_socket(&ustconsumer32_data,
2935 cmd_ctx->session->ust_session->consumer);
2936 if (ret < 0) {
2937 goto error;
2938 }
2939 }
2940 break;
2941 }
2942 default:
2943 break;
2944 }
2945 skip_domain:
2946
2947 /* Validate consumer daemon state when start/stop trace command */
2948 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2949 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2950 switch (cmd_ctx->lsm->domain.type) {
2951 case LTTNG_DOMAIN_JUL:
2952 case LTTNG_DOMAIN_UST:
2953 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
2954 ret = LTTNG_ERR_NO_USTCONSUMERD;
2955 goto error;
2956 }
2957 break;
2958 case LTTNG_DOMAIN_KERNEL:
2959 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
2960 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2961 goto error;
2962 }
2963 break;
2964 }
2965 }
2966
2967 /*
2968 * Check that the UID or GID match that of the tracing session.
2969 * The root user can interact with all sessions.
2970 */
2971 if (need_tracing_session) {
2972 if (!session_access_ok(cmd_ctx->session,
2973 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2974 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
2975 ret = LTTNG_ERR_EPERM;
2976 goto error;
2977 }
2978 }
2979
2980 /*
2981 * Send relayd information to consumer as soon as we have a domain and a
2982 * session defined.
2983 */
2984 if (cmd_ctx->session && need_domain) {
2985 /*
2986 * Setup relayd if not done yet. If the relayd information was already
2987 * sent to the consumer, this call will gracefully return.
2988 */
2989 ret = cmd_setup_relayd(cmd_ctx->session);
2990 if (ret != LTTNG_OK) {
2991 goto error;
2992 }
2993 }
2994
2995 /* Process by command type */
2996 switch (cmd_ctx->lsm->cmd_type) {
2997 case LTTNG_ADD_CONTEXT:
2998 {
2999 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3000 cmd_ctx->lsm->u.context.channel_name,
3001 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
3002 break;
3003 }
3004 case LTTNG_DISABLE_CHANNEL:
3005 {
3006 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3007 cmd_ctx->lsm->u.disable.channel_name);
3008 break;
3009 }
3010 case LTTNG_DISABLE_EVENT:
3011 {
3012 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3013 cmd_ctx->lsm->u.disable.channel_name,
3014 cmd_ctx->lsm->u.disable.name);
3015 break;
3016 }
3017 case LTTNG_DISABLE_ALL_EVENT:
3018 {
3019 DBG("Disabling all events");
3020
3021 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3022 cmd_ctx->lsm->u.disable.channel_name);
3023 break;
3024 }
3025 case LTTNG_ENABLE_CHANNEL:
3026 {
3027 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
3028 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
3029 break;
3030 }
3031 case LTTNG_ENABLE_EVENT:
3032 {
3033 struct lttng_event_exclusion *exclusion = NULL;
3034 struct lttng_filter_bytecode *bytecode = NULL;
3035
3036 /* Handle exclusion events and receive it from the client. */
3037 if (cmd_ctx->lsm->u.enable.exclusion_count > 0) {
3038 size_t count = cmd_ctx->lsm->u.enable.exclusion_count;
3039
3040 exclusion = zmalloc(sizeof(struct lttng_event_exclusion) +
3041 (count * LTTNG_SYMBOL_NAME_LEN));
3042 if (!exclusion) {
3043 ret = LTTNG_ERR_EXCLUSION_NOMEM;
3044 goto error;
3045 }
3046
3047 DBG("Receiving var len exclusion event list from client ...");
3048 exclusion->count = count;
3049 ret = lttcomm_recv_unix_sock(sock, exclusion->names,
3050 count * LTTNG_SYMBOL_NAME_LEN);
3051 if (ret <= 0) {
3052 DBG("Nothing recv() from client var len data... continuing");
3053 *sock_error = 1;
3054 free(exclusion);
3055 ret = LTTNG_ERR_EXCLUSION_INVAL;
3056 goto error;
3057 }
3058 }
3059
3060 /* Handle filter and get bytecode from client. */
3061 if (cmd_ctx->lsm->u.enable.bytecode_len > 0) {
3062 size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len;
3063
3064 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
3065 ret = LTTNG_ERR_FILTER_INVAL;
3066 free(exclusion);
3067 goto error;
3068 }
3069
3070 bytecode = zmalloc(bytecode_len);
3071 if (!bytecode) {
3072 free(exclusion);
3073 ret = LTTNG_ERR_FILTER_NOMEM;
3074 goto error;
3075 }
3076
3077 /* Receive var. len. data */
3078 DBG("Receiving var len filter's bytecode from client ...");
3079 ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
3080 if (ret <= 0) {
3081 DBG("Nothing recv() from client car len data... continuing");
3082 *sock_error = 1;
3083 free(bytecode);
3084 free(exclusion);
3085 ret = LTTNG_ERR_FILTER_INVAL;
3086 goto error;
3087 }
3088
3089 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
3090 free(bytecode);
3091 free(exclusion);
3092 ret = LTTNG_ERR_FILTER_INVAL;
3093 goto error;
3094 }
3095 }
3096
3097 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3098 cmd_ctx->lsm->u.enable.channel_name,
3099 &cmd_ctx->lsm->u.enable.event, bytecode, exclusion,
3100 kernel_poll_pipe[1]);
3101 break;
3102 }
3103 case LTTNG_ENABLE_ALL_EVENT:
3104 {
3105 DBG("Enabling all events");
3106
3107 ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain,
3108 cmd_ctx->lsm->u.enable.channel_name,
3109 cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]);
3110 break;
3111 }
3112 case LTTNG_LIST_TRACEPOINTS:
3113 {
3114 struct lttng_event *events;
3115 ssize_t nb_events;
3116
3117 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3118 if (nb_events < 0) {
3119 /* Return value is a negative lttng_error_code. */
3120 ret = -nb_events;
3121 goto error;
3122 }
3123
3124 /*
3125 * Setup lttng message with payload size set to the event list size in
3126 * bytes and then copy list into the llm payload.
3127 */
3128 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3129 if (ret < 0) {
3130 free(events);
3131 goto setup_error;
3132 }
3133
3134 /* Copy event list into message payload */
3135 memcpy(cmd_ctx->llm->payload, events,
3136 sizeof(struct lttng_event) * nb_events);
3137
3138 free(events);
3139
3140 ret = LTTNG_OK;
3141 break;
3142 }
3143 case LTTNG_LIST_TRACEPOINT_FIELDS:
3144 {
3145 struct lttng_event_field *fields;
3146 ssize_t nb_fields;
3147
3148 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
3149 &fields);
3150 if (nb_fields < 0) {
3151 /* Return value is a negative lttng_error_code. */
3152 ret = -nb_fields;
3153 goto error;
3154 }
3155
3156 /*
3157 * Setup lttng message with payload size set to the event list size in
3158 * bytes and then copy list into the llm payload.
3159 */
3160 ret = setup_lttng_msg(cmd_ctx,
3161 sizeof(struct lttng_event_field) * nb_fields);
3162 if (ret < 0) {
3163 free(fields);
3164 goto setup_error;
3165 }
3166
3167 /* Copy event list into message payload */
3168 memcpy(cmd_ctx->llm->payload, fields,
3169 sizeof(struct lttng_event_field) * nb_fields);
3170
3171 free(fields);
3172
3173 ret = LTTNG_OK;
3174 break;
3175 }
3176 case LTTNG_SET_CONSUMER_URI:
3177 {
3178 size_t nb_uri, len;
3179 struct lttng_uri *uris;
3180
3181 nb_uri = cmd_ctx->lsm->u.uri.size;
3182 len = nb_uri * sizeof(struct lttng_uri);
3183
3184 if (nb_uri == 0) {
3185 ret = LTTNG_ERR_INVALID;
3186 goto error;
3187 }
3188
3189 uris = zmalloc(len);
3190 if (uris == NULL) {
3191 ret = LTTNG_ERR_FATAL;
3192 goto error;
3193 }
3194
3195 /* Receive variable len data */
3196 DBG("Receiving %zu URI(s) from client ...", nb_uri);
3197 ret = lttcomm_recv_unix_sock(sock, uris, len);
3198 if (ret <= 0) {
3199 DBG("No URIs received from client... continuing");
3200 *sock_error = 1;
3201 ret = LTTNG_ERR_SESSION_FAIL;
3202 free(uris);
3203 goto error;
3204 }
3205
3206 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3207 nb_uri, uris);
3208 if (ret != LTTNG_OK) {
3209 free(uris);
3210 goto error;
3211 }
3212
3213 /*
3214 * XXX: 0 means that this URI should be applied on the session. Should
3215 * be a DOMAIN enuam.
3216 */
3217 if (cmd_ctx->lsm->domain.type == 0) {
3218 /* Add the URI for the UST session if a consumer is present. */
3219 if (cmd_ctx->session->ust_session &&
3220 cmd_ctx->session->ust_session->consumer) {
3221 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
3222 nb_uri, uris);
3223 } else if (cmd_ctx->session->kernel_session &&
3224 cmd_ctx->session->kernel_session->consumer) {
3225 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
3226 cmd_ctx->session, nb_uri, uris);
3227 }
3228 }
3229
3230 free(uris);
3231
3232 break;
3233 }
3234 case LTTNG_START_TRACE:
3235 {
3236 ret = cmd_start_trace(cmd_ctx->session);
3237 break;
3238 }
3239 case LTTNG_STOP_TRACE:
3240 {
3241 ret = cmd_stop_trace(cmd_ctx->session);
3242 break;
3243 }
3244 case LTTNG_CREATE_SESSION:
3245 {
3246 size_t nb_uri, len;
3247 struct lttng_uri *uris = NULL;
3248
3249 nb_uri = cmd_ctx->lsm->u.uri.size;
3250 len = nb_uri * sizeof(struct lttng_uri);
3251
3252 if (nb_uri > 0) {
3253 uris = zmalloc(len);
3254 if (uris == NULL) {
3255 ret = LTTNG_ERR_FATAL;
3256 goto error;
3257 }
3258
3259 /* Receive variable len data */
3260 DBG("Waiting for %zu URIs from client ...", nb_uri);
3261 ret = lttcomm_recv_unix_sock(sock, uris, len);
3262 if (ret <= 0) {
3263 DBG("No URIs received from client... continuing");
3264 *sock_error = 1;
3265 ret = LTTNG_ERR_SESSION_FAIL;
3266 free(uris);
3267 goto error;
3268 }
3269
3270 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3271 DBG("Creating session with ONE network URI is a bad call");
3272 ret = LTTNG_ERR_SESSION_FAIL;
3273 free(uris);
3274 goto error;
3275 }
3276 }
3277
3278 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
3279 &cmd_ctx->creds, 0);
3280
3281 free(uris);
3282
3283 break;
3284 }
3285 case LTTNG_DESTROY_SESSION:
3286 {
3287 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
3288
3289 /* Set session to NULL so we do not unlock it after free. */
3290 cmd_ctx->session = NULL;
3291 break;
3292 }
3293 case LTTNG_LIST_DOMAINS:
3294 {
3295 ssize_t nb_dom;
3296 struct lttng_domain *domains;
3297
3298 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3299 if (nb_dom < 0) {
3300 /* Return value is a negative lttng_error_code. */
3301 ret = -nb_dom;
3302 goto error;
3303 }
3304
3305 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3306 if (ret < 0) {
3307 free(domains);
3308 goto setup_error;
3309 }
3310
3311 /* Copy event list into message payload */
3312 memcpy(cmd_ctx->llm->payload, domains,
3313 nb_dom * sizeof(struct lttng_domain));
3314
3315 free(domains);
3316
3317 ret = LTTNG_OK;
3318 break;
3319 }
3320 case LTTNG_LIST_CHANNELS:
3321 {
3322 int nb_chan;
3323 struct lttng_channel *channels;
3324
3325 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3326 cmd_ctx->session, &channels);
3327 if (nb_chan < 0) {
3328 /* Return value is a negative lttng_error_code. */
3329 ret = -nb_chan;
3330 goto error;
3331 }
3332
3333 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3334 if (ret < 0) {
3335 free(channels);
3336 goto setup_error;
3337 }
3338
3339 /* Copy event list into message payload */
3340 memcpy(cmd_ctx->llm->payload, channels,
3341 nb_chan * sizeof(struct lttng_channel));
3342
3343 free(channels);
3344
3345 ret = LTTNG_OK;
3346 break;
3347 }
3348 case LTTNG_LIST_EVENTS:
3349 {
3350 ssize_t nb_event;
3351 struct lttng_event *events = NULL;
3352
3353 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3354 cmd_ctx->lsm->u.list.channel_name, &events);
3355 if (nb_event < 0) {
3356 /* Return value is a negative lttng_error_code. */
3357 ret = -nb_event;
3358 goto error;
3359 }
3360
3361 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3362 if (ret < 0) {
3363 free(events);
3364 goto setup_error;
3365 }
3366
3367 /* Copy event list into message payload */
3368 memcpy(cmd_ctx->llm->payload, events,
3369 nb_event * sizeof(struct lttng_event));
3370
3371 free(events);
3372
3373 ret = LTTNG_OK;
3374 break;
3375 }
3376 case LTTNG_LIST_SESSIONS:
3377 {
3378 unsigned int nr_sessions;
3379
3380 session_lock_list();
3381 nr_sessions = lttng_sessions_count(
3382 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3383 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3384
3385 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3386 if (ret < 0) {
3387 session_unlock_list();
3388 goto setup_error;
3389 }
3390
3391 /* Filled the session array */
3392 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3393 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3394 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3395
3396 session_unlock_list();
3397
3398 ret = LTTNG_OK;
3399 break;
3400 }
3401 case LTTNG_CALIBRATE:
3402 {
3403 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3404 &cmd_ctx->lsm->u.calibrate);
3405 break;
3406 }
3407 case LTTNG_REGISTER_CONSUMER:
3408 {
3409 struct consumer_data *cdata;
3410
3411 switch (cmd_ctx->lsm->domain.type) {
3412 case LTTNG_DOMAIN_KERNEL:
3413 cdata = &kconsumer_data;
3414 break;
3415 default:
3416 ret = LTTNG_ERR_UND;
3417 goto error;
3418 }
3419
3420 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3421 cmd_ctx->lsm->u.reg.path, cdata);
3422 break;
3423 }
3424 case LTTNG_DATA_PENDING:
3425 {
3426 ret = cmd_data_pending(cmd_ctx->session);
3427 break;
3428 }
3429 case LTTNG_SNAPSHOT_ADD_OUTPUT:
3430 {
3431 struct lttcomm_lttng_output_id reply;
3432
3433 ret = cmd_snapshot_add_output(cmd_ctx->session,
3434 &cmd_ctx->lsm->u.snapshot_output.output, &reply.id);
3435 if (ret != LTTNG_OK) {
3436 goto error;
3437 }
3438
3439 ret = setup_lttng_msg(cmd_ctx, sizeof(reply));
3440 if (ret < 0) {
3441 goto setup_error;
3442 }
3443
3444 /* Copy output list into message payload */
3445 memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply));
3446 ret = LTTNG_OK;
3447 break;
3448 }
3449 case LTTNG_SNAPSHOT_DEL_OUTPUT:
3450 {
3451 ret = cmd_snapshot_del_output(cmd_ctx->session,
3452 &cmd_ctx->lsm->u.snapshot_output.output);
3453 break;
3454 }
3455 case LTTNG_SNAPSHOT_LIST_OUTPUT:
3456 {
3457 ssize_t nb_output;
3458 struct lttng_snapshot_output *outputs = NULL;
3459
3460 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
3461 if (nb_output < 0) {
3462 ret = -nb_output;
3463 goto error;
3464 }
3465
3466 ret = setup_lttng_msg(cmd_ctx,
3467 nb_output * sizeof(struct lttng_snapshot_output));
3468 if (ret < 0) {
3469 free(outputs);
3470 goto setup_error;
3471 }
3472
3473 if (outputs) {
3474 /* Copy output list into message payload */
3475 memcpy(cmd_ctx->llm->payload, outputs,
3476 nb_output * sizeof(struct lttng_snapshot_output));
3477 free(outputs);
3478 }
3479
3480 ret = LTTNG_OK;
3481 break;
3482 }
3483 case LTTNG_SNAPSHOT_RECORD:
3484 {
3485 ret = cmd_snapshot_record(cmd_ctx->session,
3486 &cmd_ctx->lsm->u.snapshot_record.output,
3487 cmd_ctx->lsm->u.snapshot_record.wait);
3488 break;
3489 }
3490 case LTTNG_CREATE_SESSION_SNAPSHOT:
3491 {
3492 size_t nb_uri, len;
3493 struct lttng_uri *uris = NULL;
3494
3495 nb_uri = cmd_ctx->lsm->u.uri.size;
3496 len = nb_uri * sizeof(struct lttng_uri);
3497
3498 if (nb_uri > 0) {
3499 uris = zmalloc(len);
3500 if (uris == NULL) {
3501 ret = LTTNG_ERR_FATAL;
3502 goto error;
3503 }
3504
3505 /* Receive variable len data */
3506 DBG("Waiting for %zu URIs from client ...", nb_uri);
3507 ret = lttcomm_recv_unix_sock(sock, uris, len);
3508 if (ret <= 0) {
3509 DBG("No URIs received from client... continuing");
3510 *sock_error = 1;
3511 ret = LTTNG_ERR_SESSION_FAIL;
3512 free(uris);
3513 goto error;
3514 }
3515
3516 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3517 DBG("Creating session with ONE network URI is a bad call");
3518 ret = LTTNG_ERR_SESSION_FAIL;
3519 free(uris);
3520 goto error;
3521 }
3522 }
3523
3524 ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris,
3525 nb_uri, &cmd_ctx->creds);
3526 free(uris);
3527 break;
3528 }
3529 case LTTNG_CREATE_SESSION_LIVE:
3530 {
3531 size_t nb_uri, len;
3532 struct lttng_uri *uris = NULL;
3533
3534 nb_uri = cmd_ctx->lsm->u.uri.size;
3535 len = nb_uri * sizeof(struct lttng_uri);
3536
3537 if (nb_uri > 0) {
3538 uris = zmalloc(len);
3539 if (uris == NULL) {
3540 ret = LTTNG_ERR_FATAL;
3541 goto error;
3542 }
3543
3544 /* Receive variable len data */
3545 DBG("Waiting for %zu URIs from client ...", nb_uri);
3546 ret = lttcomm_recv_unix_sock(sock, uris, len);
3547 if (ret <= 0) {
3548 DBG("No URIs received from client... continuing");
3549 *sock_error = 1;
3550 ret = LTTNG_ERR_SESSION_FAIL;
3551 free(uris);
3552 goto error;
3553 }
3554
3555 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3556 DBG("Creating session with ONE network URI is a bad call");
3557 ret = LTTNG_ERR_SESSION_FAIL;
3558 free(uris);
3559 goto error;
3560 }
3561 }
3562
3563 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris,
3564 nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval);
3565 free(uris);
3566 break;
3567 }
3568 default:
3569 ret = LTTNG_ERR_UND;
3570 break;
3571 }
3572
3573 error:
3574 if (cmd_ctx->llm == NULL) {
3575 DBG("Missing llm structure. Allocating one.");
3576 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3577 goto setup_error;
3578 }
3579 }
3580 /* Set return code */
3581 cmd_ctx->llm->ret_code = ret;
3582 setup_error:
3583 if (cmd_ctx->session) {
3584 session_unlock(cmd_ctx->session);
3585 }
3586 if (need_tracing_session) {
3587 session_unlock_list();
3588 }
3589 init_setup_error:
3590 return ret;
3591 }
3592
3593 /*
3594 * Thread managing health check socket.
3595 */
3596 static void *thread_manage_health(void *data)
3597 {
3598 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
3599 uint32_t revents, nb_fd;
3600 struct lttng_poll_event events;
3601 struct health_comm_msg msg;
3602 struct health_comm_reply reply;
3603
3604 DBG("[thread] Manage health check started");
3605
3606 rcu_register_thread();
3607
3608 /* We might hit an error path before this is created. */
3609 lttng_poll_init(&events);
3610
3611 /* Create unix socket */
3612 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3613 if (sock < 0) {
3614 ERR("Unable to create health check Unix socket");
3615 ret = -1;
3616 goto error;
3617 }
3618
3619 if (is_root) {
3620 /* lttng health client socket path permissions */
3621 ret = chown(health_unix_sock_path, 0,
3622 utils_get_group_id(tracing_group_name));
3623 if (ret < 0) {
3624 ERR("Unable to set group on %s", health_unix_sock_path);
3625 PERROR("chown");
3626 ret = -1;
3627 goto error;
3628 }
3629
3630 ret = chmod(health_unix_sock_path,
3631 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3632 if (ret < 0) {
3633 ERR("Unable to set permissions on %s", health_unix_sock_path);
3634 PERROR("chmod");
3635 ret = -1;
3636 goto error;
3637 }
3638 }
3639
3640 /*
3641 * Set the CLOEXEC flag. Return code is useless because either way, the
3642 * show must go on.
3643 */
3644 (void) utils_set_fd_cloexec(sock);
3645
3646 ret = lttcomm_listen_unix_sock(sock);
3647 if (ret < 0) {
3648 goto error;
3649 }
3650
3651 /*
3652 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3653 * more will be added to this poll set.
3654 */
3655 ret = sessiond_set_thread_pollset(&events, 2);
3656 if (ret < 0) {
3657 goto error;
3658 }
3659
3660 /* Add the application registration socket */
3661 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3662 if (ret < 0) {
3663 goto error;
3664 }
3665
3666 lttng_sessiond_notify_ready();
3667
3668 while (1) {
3669 DBG("Health check ready");
3670
3671 /* Inifinite blocking call, waiting for transmission */
3672 restart:
3673 ret = lttng_poll_wait(&events, -1);
3674 if (ret < 0) {
3675 /*
3676 * Restart interrupted system call.
3677 */
3678 if (errno == EINTR) {
3679 goto restart;
3680 }
3681 goto error;
3682 }
3683
3684 nb_fd = ret;
3685
3686 for (i = 0; i < nb_fd; i++) {
3687 /* Fetch once the poll data */
3688 revents = LTTNG_POLL_GETEV(&events, i);
3689 pollfd = LTTNG_POLL_GETFD(&events, i);
3690
3691 /* Thread quit pipe has been closed. Killing thread. */
3692 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3693 if (ret) {
3694 err = 0;
3695 goto exit;
3696 }
3697
3698 /* Event on the registration socket */
3699 if (pollfd == sock) {
3700 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3701 ERR("Health socket poll error");
3702 goto error;
3703 }
3704 }
3705 }
3706
3707 new_sock = lttcomm_accept_unix_sock(sock);
3708 if (new_sock < 0) {
3709 goto error;
3710 }
3711
3712 /*
3713 * Set the CLOEXEC flag. Return code is useless because either way, the
3714 * show must go on.
3715 */
3716 (void) utils_set_fd_cloexec(new_sock);
3717
3718 DBG("Receiving data from client for health...");
3719 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
3720 if (ret <= 0) {
3721 DBG("Nothing recv() from client... continuing");
3722 ret = close(new_sock);
3723 if (ret) {
3724 PERROR("close");
3725 }
3726 new_sock = -1;
3727 continue;
3728 }
3729
3730 rcu_thread_online();
3731
3732 reply.ret_code = 0;
3733 for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
3734 /*
3735 * health_check_state returns 0 if health is
3736 * bad.
3737 */
3738 if (!health_check_state(health_sessiond, i)) {
3739 reply.ret_code |= 1ULL << i;
3740 }
3741 }
3742
3743 DBG2("Health check return value %" PRIx64, reply.ret_code);
3744
3745 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3746 if (ret < 0) {
3747 ERR("Failed to send health data back to client");
3748 }
3749
3750 /* End of transmission */
3751 ret = close(new_sock);
3752 if (ret) {
3753 PERROR("close");
3754 }
3755 new_sock = -1;
3756 }
3757
3758 exit:
3759 error:
3760 if (err) {
3761 ERR("Health error occurred in %s", __func__);
3762 }
3763 DBG("Health check thread dying");
3764 unlink(health_unix_sock_path);
3765 if (sock >= 0) {
3766 ret = close(sock);
3767 if (ret) {
3768 PERROR("close");
3769 }
3770 }
3771
3772 lttng_poll_clean(&events);
3773
3774 rcu_unregister_thread();
3775 return NULL;
3776 }
3777
3778 /*
3779 * This thread manage all clients request using the unix client socket for
3780 * communication.
3781 */
3782 static void *thread_manage_clients(void *data)
3783 {
3784 int sock = -1, ret, i, pollfd, err = -1;
3785 int sock_error;
3786 uint32_t revents, nb_fd;
3787 struct command_ctx *cmd_ctx = NULL;
3788 struct lttng_poll_event events;
3789
3790 DBG("[thread] Manage client started");
3791
3792 rcu_register_thread();
3793
3794 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
3795
3796 health_code_update();
3797
3798 ret = lttcomm_listen_unix_sock(client_sock);
3799 if (ret < 0) {
3800 goto error_listen;
3801 }
3802
3803 /*
3804 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3805 * more will be added to this poll set.
3806 */
3807 ret = sessiond_set_thread_pollset(&events, 2);
3808 if (ret < 0) {
3809 goto error_create_poll;
3810 }
3811
3812 /* Add the application registration socket */
3813 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3814 if (ret < 0) {
3815 goto error;
3816 }
3817
3818 lttng_sessiond_notify_ready();
3819
3820 /* This testpoint is after we signal readiness to the parent. */
3821 if (testpoint(sessiond_thread_manage_clients)) {
3822 goto error;
3823 }
3824
3825 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
3826 goto error;
3827 }
3828
3829 health_code_update();
3830
3831 while (1) {
3832 DBG("Accepting client command ...");
3833
3834 /* Inifinite blocking call, waiting for transmission */
3835 restart:
3836 health_poll_entry();
3837 ret = lttng_poll_wait(&events, -1);
3838 health_poll_exit();
3839 if (ret < 0) {
3840 /*
3841 * Restart interrupted system call.
3842 */
3843 if (errno == EINTR) {
3844 goto restart;
3845 }
3846 goto error;
3847 }
3848
3849 nb_fd = ret;
3850
3851 for (i = 0; i < nb_fd; i++) {
3852 /* Fetch once the poll data */
3853 revents = LTTNG_POLL_GETEV(&events, i);
3854 pollfd = LTTNG_POLL_GETFD(&events, i);
3855
3856 health_code_update();
3857
3858 /* Thread quit pipe has been closed. Killing thread. */
3859 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3860 if (ret) {
3861 err = 0;
3862 goto exit;
3863 }
3864
3865 /* Event on the registration socket */
3866 if (pollfd == client_sock) {
3867 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3868 ERR("Client socket poll error");
3869 goto error;
3870 }
3871 }
3872 }
3873
3874 DBG("Wait for client response");
3875
3876 health_code_update();
3877
3878 sock = lttcomm_accept_unix_sock(client_sock);
3879 if (sock < 0) {
3880 goto error;
3881 }
3882
3883 /*
3884 * Set the CLOEXEC flag. Return code is useless because either way, the
3885 * show must go on.
3886 */
3887 (void) utils_set_fd_cloexec(sock);
3888
3889 /* Set socket option for credentials retrieval */
3890 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3891 if (ret < 0) {
3892 goto error;
3893 }
3894
3895 /* Allocate context command to process the client request */
3896 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3897 if (cmd_ctx == NULL) {
3898 PERROR("zmalloc cmd_ctx");
3899 goto error;
3900 }
3901
3902 /* Allocate data buffer for reception */
3903 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3904 if (cmd_ctx->lsm == NULL) {
3905 PERROR("zmalloc cmd_ctx->lsm");
3906 goto error;
3907 }
3908
3909 cmd_ctx->llm = NULL;
3910 cmd_ctx->session = NULL;
3911
3912 health_code_update();
3913
3914 /*
3915 * Data is received from the lttng client. The struct
3916 * lttcomm_session_msg (lsm) contains the command and data request of
3917 * the client.
3918 */
3919 DBG("Receiving data from client ...");
3920 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3921 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3922 if (ret <= 0) {
3923 DBG("Nothing recv() from client... continuing");
3924 ret = close(sock);
3925 if (ret) {
3926 PERROR("close");
3927 }
3928 sock = -1;
3929 clean_command_ctx(&cmd_ctx);
3930 continue;
3931 }
3932
3933 health_code_update();
3934
3935 // TODO: Validate cmd_ctx including sanity check for
3936 // security purpose.
3937
3938 rcu_thread_online();
3939 /*
3940 * This function dispatch the work to the kernel or userspace tracer
3941 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3942 * informations for the client. The command context struct contains
3943 * everything this function may needs.
3944 */
3945 ret = process_client_msg(cmd_ctx, sock, &sock_error);
3946 rcu_thread_offline();
3947 if (ret < 0) {
3948 ret = close(sock);
3949 if (ret) {
3950 PERROR("close");
3951 }
3952 sock = -1;
3953 /*
3954 * TODO: Inform client somehow of the fatal error. At
3955 * this point, ret < 0 means that a zmalloc failed
3956 * (ENOMEM). Error detected but still accept
3957 * command, unless a socket error has been
3958 * detected.
3959 */
3960 clean_command_ctx(&cmd_ctx);
3961 continue;
3962 }
3963
3964 health_code_update();
3965
3966 DBG("Sending response (size: %d, retcode: %s)",
3967 cmd_ctx->lttng_msg_size,
3968 lttng_strerror(-cmd_ctx->llm->ret_code));
3969 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3970 if (ret < 0) {
3971 ERR("Failed to send data back to client");
3972 }
3973
3974 /* End of transmission */
3975 ret = close(sock);
3976 if (ret) {
3977 PERROR("close");
3978 }
3979 sock = -1;
3980
3981 clean_command_ctx(&cmd_ctx);
3982
3983 health_code_update();
3984 }
3985
3986 exit:
3987 error:
3988 if (sock >= 0) {
3989 ret = close(sock);
3990 if (ret) {
3991 PERROR("close");
3992 }
3993 }
3994
3995 lttng_poll_clean(&events);
3996 clean_command_ctx(&cmd_ctx);
3997
3998 error_listen:
3999 error_create_poll:
4000 unlink(client_unix_sock_path);
4001 if (client_sock >= 0) {
4002 ret = close(client_sock);
4003 if (ret) {
4004 PERROR("close");
4005 }
4006 }
4007
4008 if (err) {
4009 health_error();
4010 ERR("Health error occurred in %s", __func__);
4011 }
4012
4013 health_unregister(health_sessiond);
4014
4015 DBG("Client thread dying");
4016
4017 rcu_unregister_thread();
4018 return NULL;
4019 }
4020
4021
4022 /*
4023 * usage function on stderr
4024 */
4025 static void usage(void)
4026 {
4027 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
4028 fprintf(stderr, " -h, --help Display this usage.\n");
4029 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
4030 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
4031 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
4032 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
4033 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
4034 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
4035 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
4036 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
4037 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
4038 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
4039 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4040 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
4041 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
4042 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4043 fprintf(stderr, " -V, --version Show version number.\n");
4044 fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
4045 fprintf(stderr, " -q, --quiet No output at all.\n");
4046 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
4047 fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
4048 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4049 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
4050 fprintf(stderr, " --jul-tcp-port JUL application registration TCP port\n");
4051 fprintf(stderr, " -f --config Load daemon configuration file\n");
4052 }
4053
4054 /*
4055 * Take an option from the getopt output and set it in the right variable to be
4056 * used later.
4057 *
4058 * Return 0 on success else a negative value.
4059 */
4060 static int set_option(int opt, const char *arg, const char *optname)
4061 {
4062 int ret = 0;
4063
4064 switch (opt) {
4065 case 0:
4066 fprintf(stderr, "option %s", optname);
4067 if (arg) {
4068 fprintf(stderr, " with arg %s\n", arg);
4069 }
4070 break;
4071 case 'c':
4072 snprintf(client_unix_sock_path, PATH_MAX, "%s", arg);
4073 break;
4074 case 'a':
4075 snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg);
4076 break;
4077 case 'd':
4078 opt_daemon = 1;
4079 break;
4080 case 'g':
4081 tracing_group_name = strdup(arg);
4082 break;
4083 case 'h':
4084 usage();
4085 exit(EXIT_FAILURE);
4086 case 'V':
4087 fprintf(stdout, "%s\n", VERSION);
4088 exit(EXIT_SUCCESS);
4089 case 'S':
4090 opt_sig_parent = 1;
4091 break;
4092 case 'E':
4093 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4094 break;
4095 case 'C':
4096 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4097 break;
4098 case 'F':
4099 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4100 break;
4101 case 'D':
4102 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4103 break;
4104 case 'H':
4105 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4106 break;
4107 case 'G':
4108 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4109 break;
4110 case 'N':
4111 opt_no_kernel = 1;
4112 break;
4113 case 'q':
4114 lttng_opt_quiet = 1;
4115 break;
4116 case 'v':
4117 /* Verbose level can increase using multiple -v */
4118 if (arg) {
4119 lttng_opt_verbose = config_parse_value(arg);
4120 } else {
4121 lttng_opt_verbose += 1;
4122 }
4123 break;
4124 case 'Z':
4125 if (arg) {
4126 opt_verbose_consumer = config_parse_value(arg);
4127 } else {
4128 opt_verbose_consumer += 1;
4129 }
4130 break;
4131 case 'u':
4132 consumerd32_bin = strdup(arg);
4133 consumerd32_bin_override = 1;
4134 break;
4135 case 'U':
4136 consumerd32_libdir = strdup(arg);
4137 consumerd32_libdir_override = 1;
4138 break;
4139 case 't':
4140 consumerd64_bin = strdup(arg);
4141 consumerd64_bin_override = 1;
4142 break;
4143 case 'T':
4144 consumerd64_libdir = strdup(arg);
4145 consumerd64_libdir_override = 1;
4146 break;
4147 case 'p':
4148 opt_pidfile = strdup(arg);
4149 break;
4150 case 'J': /* JUL TCP port. */
4151 {
4152 unsigned long v;
4153
4154 errno = 0;
4155 v = strtoul(arg, NULL, 0);
4156 if (errno != 0 || !isdigit(arg[0])) {
4157 ERR("Wrong value in --jul-tcp-port parameter: %s", arg);
4158 return -1;
4159 }
4160 if (v == 0 || v >= 65535) {
4161 ERR("Port overflow in --jul-tcp-port parameter: %s", arg);
4162 return -1;
4163 }
4164 jul_tcp_port = (uint32_t) v;
4165 DBG3("JUL TCP port set to non default: %u", jul_tcp_port);
4166 break;
4167 }
4168 default:
4169 /* Unknown option or other error.
4170 * Error is printed by getopt, just return */
4171 ret = -1;
4172 }
4173
4174 return ret;
4175 }
4176
4177 /*
4178 * config_entry_handler_cb used to handle options read from a config file.
4179 * See config_entry_handler_cb comment in common/config/config.h for the
4180 * return value conventions.
4181 */
4182 static int config_entry_handler(const struct config_entry *entry, void *unused)
4183 {
4184 int ret = 0, i;
4185
4186 if (!entry || !entry->name || !entry->value) {
4187 ret = -EINVAL;
4188 goto end;
4189 }
4190
4191 /* Check if the option is to be ignored */
4192 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
4193 if (!strcmp(entry->name, config_ignore_options[i])) {
4194 goto end;
4195 }
4196 }
4197
4198 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
4199 i++) {
4200
4201 /* Ignore if not fully matched. */
4202 if (strcmp(entry->name, long_options[i].name)) {
4203 continue;
4204 }
4205
4206 /*
4207 * If the option takes no argument on the command line, we have to
4208 * check if the value is "true". We support non-zero numeric values,
4209 * true, on and yes.
4210 */
4211 if (!long_options[i].has_arg) {
4212 ret = config_parse_value(entry->value);
4213 if (ret <= 0) {
4214 if (ret) {
4215 WARN("Invalid configuration value \"%s\" for option %s",
4216 entry->value, entry->name);
4217 }
4218 /* False, skip boolean config option. */
4219 goto end;
4220 }
4221 }
4222
4223 ret = set_option(long_options[i].val, entry->value, entry->name);
4224 goto end;
4225 }
4226
4227 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
4228
4229 end:
4230 return ret;
4231 }
4232
4233 /*
4234 * daemon configuration loading and argument parsing
4235 */
4236 static int set_options(int argc, char **argv)
4237 {
4238 int ret = 0, c = 0, option_index = 0;
4239 int orig_optopt = optopt, orig_optind = optind;
4240 char *optstring;
4241 const char *config_path = NULL;
4242
4243 optstring = utils_generate_optstring(long_options,
4244 sizeof(long_options) / sizeof(struct option));
4245 if (!optstring) {
4246 ret = -ENOMEM;
4247 goto end;
4248 }
4249
4250 /* Check for the --config option */
4251 while ((c = getopt_long(argc, argv, optstring, long_options,
4252 &option_index)) != -1) {
4253 if (c == '?') {
4254 ret = -EINVAL;
4255 goto end;
4256 } else if (c != 'f') {
4257 /* if not equal to --config option. */
4258 continue;
4259 }
4260
4261 config_path = utils_expand_path(optarg);
4262 if (!config_path) {
4263 ERR("Failed to resolve path: %s", optarg);
4264 }
4265 }
4266
4267 ret = config_get_section_entries(config_path, config_section_name,
4268 config_entry_handler, NULL);
4269 if (ret) {
4270 if (ret > 0) {
4271 ERR("Invalid configuration option at line %i", ret);
4272 ret = -1;
4273 }
4274 goto end;
4275 }
4276
4277 /* Reset getopt's global state */
4278 optopt = orig_optopt;
4279 optind = orig_optind;
4280 while (1) {
4281 c = getopt_long(argc, argv, optstring, long_options, &option_index);
4282 if (c == -1) {
4283 break;
4284 }
4285
4286 ret = set_option(c, optarg, long_options[option_index].name);
4287 if (ret < 0) {
4288 break;
4289 }
4290 }
4291
4292 end:
4293 free(optstring);
4294 return ret;
4295 }
4296
4297 /*
4298 * Creates the two needed socket by the daemon.
4299 * apps_sock - The communication socket for all UST apps.
4300 * client_sock - The communication of the cli tool (lttng).
4301 */
4302 static int init_daemon_socket(void)
4303 {
4304 int ret = 0;
4305 mode_t old_umask;
4306
4307 old_umask = umask(0);
4308
4309 /* Create client tool unix socket */
4310 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4311 if (client_sock < 0) {
4312 ERR("Create unix sock failed: %s", client_unix_sock_path);
4313 ret = -1;
4314 goto end;
4315 }
4316
4317 /* Set the cloexec flag */
4318 ret = utils_set_fd_cloexec(client_sock);
4319 if (ret < 0) {
4320 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4321 "Continuing but note that the consumer daemon will have a "
4322 "reference to this socket on exec()", client_sock);
4323 }
4324
4325 /* File permission MUST be 660 */
4326 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4327 if (ret < 0) {
4328 ERR("Set file permissions failed: %s", client_unix_sock_path);
4329 PERROR("chmod");
4330 goto end;
4331 }
4332
4333 /* Create the application unix socket */
4334 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4335 if (apps_sock < 0) {
4336 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4337 ret = -1;
4338 goto end;
4339 }
4340
4341 /* Set the cloexec flag */
4342 ret = utils_set_fd_cloexec(apps_sock);
4343 if (ret < 0) {
4344 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4345 "Continuing but note that the consumer daemon will have a "
4346 "reference to this socket on exec()", apps_sock);
4347 }
4348
4349 /* File permission MUST be 666 */
4350 ret = chmod(apps_unix_sock_path,
4351 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4352 if (ret < 0) {
4353 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4354 PERROR("chmod");
4355 goto end;
4356 }
4357
4358 DBG3("Session daemon client socket %d and application socket %d created",
4359 client_sock, apps_sock);
4360
4361 end:
4362 umask(old_umask);
4363 return ret;
4364 }
4365
4366 /*
4367 * Check if the global socket is available, and if a daemon is answering at the
4368 * other side. If yes, error is returned.
4369 */
4370 static int check_existing_daemon(void)
4371 {
4372 /* Is there anybody out there ? */
4373 if (lttng_session_daemon_alive()) {
4374 return -EEXIST;
4375 }
4376
4377 return 0;
4378 }
4379
4380 /*
4381 * Set the tracing group gid onto the client socket.
4382 *
4383 * Race window between mkdir and chown is OK because we are going from more
4384 * permissive (root.root) to less permissive (root.tracing).
4385 */
4386 static int set_permissions(char *rundir)
4387 {
4388 int ret;
4389 gid_t gid;
4390
4391 gid = utils_get_group_id(tracing_group_name);
4392
4393 /* Set lttng run dir */
4394 ret = chown(rundir, 0, gid);
4395 if (ret < 0) {
4396 ERR("Unable to set group on %s", rundir);
4397 PERROR("chown");
4398 }
4399
4400 /*
4401 * Ensure all applications and tracing group can search the run
4402 * dir. Allow everyone to read the directory, since it does not
4403 * buy us anything to hide its content.
4404 */
4405 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
4406 if (ret < 0) {
4407 ERR("Unable to set permissions on %s", rundir);
4408 PERROR("chmod");
4409 }
4410
4411 /* lttng client socket path */
4412 ret = chown(client_unix_sock_path, 0, gid);
4413 if (ret < 0) {
4414 ERR("Unable to set group on %s", client_unix_sock_path);
4415 PERROR("chown");
4416 }
4417
4418 /* kconsumer error socket path */
4419 ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
4420 if (ret < 0) {
4421 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4422 PERROR("chown");
4423 }
4424
4425 /* 64-bit ustconsumer error socket path */
4426 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
4427 if (ret < 0) {
4428 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4429 PERROR("chown");
4430 }
4431
4432 /* 32-bit ustconsumer compat32 error socket path */
4433 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
4434 if (ret < 0) {
4435 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4436 PERROR("chown");
4437 }
4438
4439 DBG("All permissions are set");
4440
4441 return ret;
4442 }
4443
4444 /*
4445 * Create the lttng run directory needed for all global sockets and pipe.
4446 */
4447 static int create_lttng_rundir(const char *rundir)
4448 {
4449 int ret;
4450
4451 DBG3("Creating LTTng run directory: %s", rundir);
4452
4453 ret = mkdir(rundir, S_IRWXU);
4454 if (ret < 0) {
4455 if (errno != EEXIST) {
4456 ERR("Unable to create %s", rundir);
4457 goto error;
4458 } else {
4459 ret = 0;
4460 }
4461 }
4462
4463 error:
4464 return ret;
4465 }
4466
4467 /*
4468 * Setup sockets and directory needed by the kconsumerd communication with the
4469 * session daemon.
4470 */
4471 static int set_consumer_sockets(struct consumer_data *consumer_data,
4472 const char *rundir)
4473 {
4474 int ret;
4475 char path[PATH_MAX];
4476
4477 switch (consumer_data->type) {
4478 case LTTNG_CONSUMER_KERNEL:
4479 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4480 break;
4481 case LTTNG_CONSUMER64_UST:
4482 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4483 break;
4484 case LTTNG_CONSUMER32_UST:
4485 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4486 break;
4487 default:
4488 ERR("Consumer type unknown");
4489 ret = -EINVAL;
4490 goto error;
4491 }
4492
4493 DBG2("Creating consumer directory: %s", path);
4494
4495 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
4496 if (ret < 0) {
4497 if (errno != EEXIST) {
4498 PERROR("mkdir");
4499 ERR("Failed to create %s", path);
4500 goto error;
4501 }
4502 ret = -1;
4503 }
4504 if (is_root) {
4505 ret = chown(path, 0, utils_get_group_id(tracing_group_name));
4506 if (ret < 0) {
4507 ERR("Unable to set group on %s", path);
4508 PERROR("chown");
4509 goto error;
4510 }
4511 }
4512
4513 /* Create the kconsumerd error unix socket */
4514 consumer_data->err_sock =
4515 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4516 if (consumer_data->err_sock < 0) {
4517 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4518 ret = -1;
4519 goto error;
4520 }
4521
4522 /*
4523 * Set the CLOEXEC flag. Return code is useless because either way, the
4524 * show must go on.
4525 */
4526 ret = utils_set_fd_cloexec(consumer_data->err_sock);
4527 if (ret < 0) {
4528 PERROR("utils_set_fd_cloexec");
4529 /* continue anyway */
4530 }
4531
4532 /* File permission MUST be 660 */
4533 ret = chmod(consumer_data->err_unix_sock_path,
4534 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4535 if (ret < 0) {
4536 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4537 PERROR("chmod");
4538 goto error;
4539 }
4540
4541 error:
4542 return ret;
4543 }
4544
4545 /*
4546 * Signal handler for the daemon
4547 *
4548 * Simply stop all worker threads, leaving main() return gracefully after
4549 * joining all threads and calling cleanup().
4550 */
4551 static void sighandler(int sig)
4552 {
4553 switch (sig) {
4554 case SIGPIPE:
4555 DBG("SIGPIPE caught");
4556 return;
4557 case SIGINT:
4558 DBG("SIGINT caught");
4559 stop_threads();
4560 break;
4561 case SIGTERM:
4562 DBG("SIGTERM caught");
4563 stop_threads();
4564 break;
4565 case SIGUSR1:
4566 CMM_STORE_SHARED(recv_child_signal, 1);
4567 break;
4568 default:
4569 break;
4570 }
4571 }
4572
4573 /*
4574 * Setup signal handler for :
4575 * SIGINT, SIGTERM, SIGPIPE
4576 */
4577 static int set_signal_handler(void)
4578 {
4579 int ret = 0;
4580 struct sigaction sa;
4581 sigset_t sigset;
4582
4583 if ((ret = sigemptyset(&sigset)) < 0) {
4584 PERROR("sigemptyset");
4585 return ret;
4586 }
4587
4588 sa.sa_handler = sighandler;
4589 sa.sa_mask = sigset;
4590 sa.sa_flags = 0;
4591 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4592 PERROR("sigaction");
4593 return ret;
4594 }
4595
4596 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4597 PERROR("sigaction");
4598 return ret;
4599 }
4600
4601 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4602 PERROR("sigaction");
4603 return ret;
4604 }
4605
4606 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
4607 PERROR("sigaction");
4608 return ret;
4609 }
4610
4611 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
4612
4613 return ret;
4614 }
4615
4616 /*
4617 * Set open files limit to unlimited. This daemon can open a large number of
4618 * file descriptors in order to consumer multiple kernel traces.
4619 */
4620 static void set_ulimit(void)
4621 {
4622 int ret;
4623 struct rlimit lim;
4624
4625 /* The kernel does not allowed an infinite limit for open files */
4626 lim.rlim_cur = 65535;
4627 lim.rlim_max = 65535;
4628
4629 ret = setrlimit(RLIMIT_NOFILE, &lim);
4630 if (ret < 0) {
4631 PERROR("failed to set open files limit");
4632 }
4633 }
4634
4635 /*
4636 * Write pidfile using the rundir and opt_pidfile.
4637 */
4638 static void write_pidfile(void)
4639 {
4640 int ret;
4641 char pidfile_path[PATH_MAX];
4642
4643 assert(rundir);
4644
4645 if (opt_pidfile) {
4646 strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
4647 } else {
4648 /* Build pidfile path from rundir and opt_pidfile. */
4649 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
4650 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
4651 if (ret < 0) {
4652 PERROR("snprintf pidfile path");
4653 goto error;
4654 }
4655 }
4656
4657 /*
4658 * Create pid file in rundir. Return value is of no importance. The
4659 * execution will continue even though we are not able to write the file.
4660 */
4661 (void) utils_create_pid_file(getpid(), pidfile_path);
4662
4663 error:
4664 return;
4665 }
4666
4667 /*
4668 * Write JUL TCP port using the rundir.
4669 */
4670 static void write_julport(void)
4671 {
4672 int ret;
4673 char path[PATH_MAX];
4674
4675 assert(rundir);
4676
4677 ret = snprintf(path, sizeof(path), "%s/"
4678 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE, rundir);
4679 if (ret < 0) {
4680 PERROR("snprintf julport path");
4681 goto error;
4682 }
4683
4684 /*
4685 * Create TCP JUL port file in rundir. Return value is of no importance.
4686 * The execution will continue even though we are not able to write the
4687 * file.
4688 */
4689 (void) utils_create_pid_file(jul_tcp_port, path);
4690
4691 error:
4692 return;
4693 }
4694
4695 /*
4696 * main
4697 */
4698 int main(int argc, char **argv)
4699 {
4700 int ret = 0;
4701 void *status;
4702 const char *home_path, *env_app_timeout;
4703
4704 init_kernel_workarounds();
4705
4706 rcu_register_thread();
4707
4708 if ((ret = set_signal_handler()) < 0) {
4709 goto error;
4710 }
4711
4712 setup_consumerd_path();
4713
4714 page_size = sysconf(_SC_PAGESIZE);
4715 if (page_size < 0) {
4716 PERROR("sysconf _SC_PAGESIZE");
4717 page_size = LONG_MAX;
4718 WARN("Fallback page size to %ld", page_size);
4719 }
4720
4721 /* Parse arguments and load the daemon configuration file */
4722 progname = argv[0];
4723 if ((ret = set_options(argc, argv)) < 0) {
4724 goto error;
4725 }
4726
4727 /* Daemonize */
4728 if (opt_daemon) {
4729 int i;
4730
4731 ret = lttng_daemonize(&child_ppid, &recv_child_signal, 1);
4732 if (ret < 0) {
4733 goto error;
4734 }
4735
4736 /*
4737 * We are in the child. Make sure all other file descriptors are
4738 * closed, in case we are called with more opened file descriptors than
4739 * the standard ones.
4740 */
4741 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4742 (void) close(i);
4743 }
4744 }
4745
4746 /* Create thread quit pipe */
4747 if ((ret = init_thread_quit_pipe()) < 0) {
4748 goto error;
4749 }
4750
4751 /* Check if daemon is UID = 0 */
4752 is_root = !getuid();
4753
4754 if (is_root) {
4755 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4756
4757 /* Create global run dir with root access */
4758 ret = create_lttng_rundir(rundir);
4759 if (ret < 0) {
4760 goto error;
4761 }
4762
4763 if (strlen(apps_unix_sock_path) == 0) {
4764 snprintf(apps_unix_sock_path, PATH_MAX,
4765 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4766 }
4767
4768 if (strlen(client_unix_sock_path) == 0) {
4769 snprintf(client_unix_sock_path, PATH_MAX,
4770 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4771 }
4772
4773 /* Set global SHM for ust */
4774 if (strlen(wait_shm_path) == 0) {
4775 snprintf(wait_shm_path, PATH_MAX,
4776 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4777 }
4778
4779 if (strlen(health_unix_sock_path) == 0) {
4780 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4781 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
4782 }
4783
4784 /* Setup kernel consumerd path */
4785 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4786 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4787 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4788 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4789
4790 DBG2("Kernel consumer err path: %s",
4791 kconsumer_data.err_unix_sock_path);
4792 DBG2("Kernel consumer cmd path: %s",
4793 kconsumer_data.cmd_unix_sock_path);
4794 } else {
4795 home_path = utils_get_home_dir();
4796 if (home_path == NULL) {
4797 /* TODO: Add --socket PATH option */
4798 ERR("Can't get HOME directory for sockets creation.");
4799 ret = -EPERM;
4800 goto error;
4801 }
4802
4803 /*
4804 * Create rundir from home path. This will create something like
4805 * $HOME/.lttng
4806 */
4807 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4808 if (ret < 0) {
4809 ret = -ENOMEM;
4810 goto error;
4811 }
4812
4813 ret = create_lttng_rundir(rundir);
4814 if (ret < 0) {
4815 goto error;
4816 }
4817
4818 if (strlen(apps_unix_sock_path) == 0) {
4819 snprintf(apps_unix_sock_path, PATH_MAX,
4820 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4821 }
4822
4823 /* Set the cli tool unix socket path */
4824 if (strlen(client_unix_sock_path) == 0) {
4825 snprintf(client_unix_sock_path, PATH_MAX,
4826 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4827 }
4828
4829 /* Set global SHM for ust */
4830 if (strlen(wait_shm_path) == 0) {
4831 snprintf(wait_shm_path, PATH_MAX,
4832 DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
4833 }
4834
4835 /* Set health check Unix path */
4836 if (strlen(health_unix_sock_path) == 0) {
4837 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4838 DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path);
4839 }
4840 }
4841
4842 /* Set consumer initial state */
4843 kernel_consumerd_state = CONSUMER_STOPPED;
4844 ust_consumerd_state = CONSUMER_STOPPED;
4845
4846 DBG("Client socket path %s", client_unix_sock_path);
4847 DBG("Application socket path %s", apps_unix_sock_path);
4848 DBG("Application wait path %s", wait_shm_path);
4849 DBG("LTTng run directory path: %s", rundir);
4850
4851 /* 32 bits consumerd path setup */
4852 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4853 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4854 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4855 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4856
4857 DBG2("UST consumer 32 bits err path: %s",
4858 ustconsumer32_data.err_unix_sock_path);
4859 DBG2("UST consumer 32 bits cmd path: %s",
4860 ustconsumer32_data.cmd_unix_sock_path);
4861
4862 /* 64 bits consumerd path setup */
4863 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4864 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4865 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4866 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4867
4868 DBG2("UST consumer 64 bits err path: %s",
4869 ustconsumer64_data.err_unix_sock_path);
4870 DBG2("UST consumer 64 bits cmd path: %s",
4871 ustconsumer64_data.cmd_unix_sock_path);
4872
4873 /*
4874 * See if daemon already exist.
4875 */
4876 if ((ret = check_existing_daemon()) < 0) {
4877 ERR("Already running daemon.\n");
4878 /*
4879 * We do not goto exit because we must not cleanup()
4880 * because a daemon is already running.
4881 */
4882 goto error;
4883 }
4884
4885 /*
4886 * Init UST app hash table. Alloc hash table before this point since
4887 * cleanup() can get called after that point.
4888 */
4889 ust_app_ht_alloc();
4890
4891 /* Initialize JUL domain subsystem. */
4892 if ((ret = jul_init()) < 0) {
4893 /* ENOMEM at this point. */
4894 goto error;
4895 }
4896
4897 /* After this point, we can safely call cleanup() with "goto exit" */
4898
4899 /*
4900 * These actions must be executed as root. We do that *after* setting up
4901 * the sockets path because we MUST make the check for another daemon using
4902 * those paths *before* trying to set the kernel consumer sockets and init
4903 * kernel tracer.
4904 */
4905 if (is_root) {
4906 ret = set_consumer_sockets(&kconsumer_data, rundir);
4907 if (ret < 0) {
4908 goto exit;
4909 }
4910
4911 /* Setup kernel tracer */
4912 if (!opt_no_kernel) {
4913 init_kernel_tracer();
4914 }
4915
4916 /* Set ulimit for open files */
4917 set_ulimit();
4918 }
4919 /* init lttng_fd tracking must be done after set_ulimit. */
4920 lttng_fd_init();
4921
4922 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4923 if (ret < 0) {
4924 goto exit;
4925 }
4926
4927 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4928 if (ret < 0) {
4929 goto exit;
4930 }
4931
4932 /* Setup the needed unix socket */
4933 if ((ret = init_daemon_socket()) < 0) {
4934 goto exit;
4935 }
4936
4937 /* Set credentials to socket */
4938 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4939 goto exit;
4940 }
4941
4942 /* Get parent pid if -S, --sig-parent is specified. */
4943 if (opt_sig_parent) {
4944 ppid = getppid();
4945 }
4946
4947 /* Setup the kernel pipe for waking up the kernel thread */
4948 if (is_root && !opt_no_kernel) {
4949 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
4950 goto exit;
4951 }
4952 }
4953
4954 /* Setup the thread ht_cleanup communication pipe. */
4955 if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) {
4956 goto exit;
4957 }
4958
4959 /* Setup the thread apps communication pipe. */
4960 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
4961 goto exit;
4962 }
4963
4964 /* Setup the thread apps notify communication pipe. */
4965 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) {
4966 goto exit;
4967 }
4968
4969 /* Initialize global buffer per UID and PID registry. */
4970 buffer_reg_init_uid_registry();
4971 buffer_reg_init_pid_registry();
4972
4973 /* Init UST command queue. */
4974 cds_wfq_init(&ust_cmd_queue.queue);
4975
4976 /*
4977 * Get session list pointer. This pointer MUST NOT be free(). This list is
4978 * statically declared in session.c
4979 */
4980 session_list_ptr = session_get_list();
4981
4982 /* Set up max poll set size */
4983 lttng_poll_set_max_size();
4984
4985 cmd_init();
4986
4987 /* Check for the application socket timeout env variable. */
4988 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
4989 if (env_app_timeout) {
4990 app_socket_timeout = atoi(env_app_timeout);
4991 } else {
4992 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
4993 }
4994
4995 write_pidfile();
4996 write_julport();
4997
4998 /* Initialize communication library */
4999 lttcomm_init();
5000 /* This is to get the TCP timeout value. */
5001 lttcomm_inet_init();
5002
5003 /*
5004 * Initialize the health check subsystem. This call should set the
5005 * appropriate time values.
5006 */
5007 health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
5008 if (!health_sessiond) {
5009 PERROR("health_app_create error");
5010 goto exit_health_sessiond_cleanup;
5011 }
5012
5013 /* Create thread to clean up RCU hash tables */
5014 ret = pthread_create(&ht_cleanup_thread, NULL,
5015 thread_ht_cleanup, (void *) NULL);
5016 if (ret != 0) {
5017 PERROR("pthread_create ht_cleanup");
5018 goto exit_ht_cleanup;
5019 }
5020
5021 /* Create health-check thread */
5022 ret = pthread_create(&health_thread, NULL,
5023 thread_manage_health, (void *) NULL);
5024 if (ret != 0) {
5025 PERROR("pthread_create health");
5026 goto exit_health;
5027 }
5028
5029 /* Create thread to manage the client socket */
5030 ret = pthread_create(&client_thread, NULL,
5031 thread_manage_clients, (void *) NULL);
5032 if (ret != 0) {
5033 PERROR("pthread_create clients");
5034 goto exit_client;
5035 }
5036
5037 /* Create thread to dispatch registration */
5038 ret = pthread_create(&dispatch_thread, NULL,
5039 thread_dispatch_ust_registration, (void *) NULL);
5040 if (ret != 0) {
5041 PERROR("pthread_create dispatch");
5042 goto exit_dispatch;
5043 }
5044
5045 /* Create thread to manage application registration. */
5046 ret = pthread_create(&reg_apps_thread, NULL,
5047 thread_registration_apps, (void *) NULL);
5048 if (ret != 0) {
5049 PERROR("pthread_create registration");
5050 goto exit_reg_apps;
5051 }
5052
5053 /* Create thread to manage application socket */
5054 ret = pthread_create(&apps_thread, NULL,
5055 thread_manage_apps, (void *) NULL);
5056 if (ret != 0) {
5057 PERROR("pthread_create apps");
5058 goto exit_apps;
5059 }
5060
5061 /* Create thread to manage application notify socket */
5062 ret = pthread_create(&apps_notify_thread, NULL,
5063 ust_thread_manage_notify, (void *) NULL);
5064 if (ret != 0) {
5065 PERROR("pthread_create apps");
5066 goto exit_apps_notify;
5067 }
5068
5069 /* Create JUL registration thread. */
5070 ret = pthread_create(&jul_reg_thread, NULL,
5071 jul_thread_manage_registration, (void *) NULL);
5072 if (ret != 0) {
5073 PERROR("pthread_create apps");
5074 goto exit_jul_reg;
5075 }
5076
5077 /* Don't start this thread if kernel tracing is not requested nor root */
5078 if (is_root && !opt_no_kernel) {
5079 /* Create kernel thread to manage kernel event */
5080 ret = pthread_create(&kernel_thread, NULL,
5081 thread_manage_kernel, (void *) NULL);
5082 if (ret != 0) {
5083 PERROR("pthread_create kernel");
5084 goto exit_kernel;
5085 }
5086
5087 ret = pthread_join(kernel_thread, &status);
5088 if (ret != 0) {
5089 PERROR("pthread_join");
5090 goto error; /* join error, exit without cleanup */
5091 }
5092 }
5093
5094 exit_kernel:
5095 ret = pthread_join(jul_reg_thread, &status);
5096 if (ret != 0) {
5097 PERROR("pthread_join JUL");
5098 goto error; /* join error, exit without cleanup */
5099 }
5100
5101 exit_jul_reg:
5102 ret = pthread_join(apps_notify_thread, &status);
5103 if (ret != 0) {
5104 PERROR("pthread_join apps notify");
5105 goto error; /* join error, exit without cleanup */
5106 }
5107
5108 exit_apps_notify:
5109 ret = pthread_join(apps_thread, &status);
5110 if (ret != 0) {
5111 PERROR("pthread_join apps");
5112 goto error; /* join error, exit without cleanup */
5113 }
5114
5115
5116 exit_apps:
5117 ret = pthread_join(reg_apps_thread, &status);
5118 if (ret != 0) {
5119 PERROR("pthread_join");
5120 goto error; /* join error, exit without cleanup */
5121 }
5122
5123 exit_reg_apps:
5124 ret = pthread_join(dispatch_thread, &status);
5125 if (ret != 0) {
5126 PERROR("pthread_join");
5127 goto error; /* join error, exit without cleanup */
5128 }
5129
5130 exit_dispatch:
5131 ret = pthread_join(client_thread, &status);
5132 if (ret != 0) {
5133 PERROR("pthread_join");
5134 goto error; /* join error, exit without cleanup */
5135 }
5136
5137 ret = join_consumer_thread(&kconsumer_data);
5138 if (ret != 0) {
5139 PERROR("join_consumer");
5140 goto error; /* join error, exit without cleanup */
5141 }
5142
5143 ret = join_consumer_thread(&ustconsumer32_data);
5144 if (ret != 0) {
5145 PERROR("join_consumer ust32");
5146 goto error; /* join error, exit without cleanup */
5147 }
5148
5149 ret = join_consumer_thread(&ustconsumer64_data);
5150 if (ret != 0) {
5151 PERROR("join_consumer ust64");
5152 goto error; /* join error, exit without cleanup */
5153 }
5154
5155 exit_client:
5156 ret = pthread_join(health_thread, &status);
5157 if (ret != 0) {
5158 PERROR("pthread_join health thread");
5159 goto error; /* join error, exit without cleanup */
5160 }
5161
5162 exit_health:
5163 ret = pthread_join(ht_cleanup_thread, &status);
5164 if (ret != 0) {
5165 PERROR("pthread_join ht cleanup thread");
5166 goto error; /* join error, exit without cleanup */
5167 }
5168 exit_ht_cleanup:
5169 health_app_destroy(health_sessiond);
5170 exit_health_sessiond_cleanup:
5171 exit:
5172 /*
5173 * cleanup() is called when no other thread is running.
5174 */
5175 rcu_thread_online();
5176 cleanup();
5177 rcu_thread_offline();
5178 rcu_unregister_thread();
5179 if (!ret) {
5180 exit(EXIT_SUCCESS);
5181 }
5182 error:
5183 exit(EXIT_FAILURE);
5184 }
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