Consumer: add testpoints
[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/config/config.h>
50
51 #include "lttng-sessiond.h"
52 #include "buffer-registry.h"
53 #include "channel.h"
54 #include "cmd.h"
55 #include "consumer.h"
56 #include "context.h"
57 #include "event.h"
58 #include "kernel.h"
59 #include "kernel-consumer.h"
60 #include "modprobe.h"
61 #include "shm.h"
62 #include "ust-ctl.h"
63 #include "ust-consumer.h"
64 #include "utils.h"
65 #include "fd-limit.h"
66 #include "health-sessiond.h"
67 #include "testpoint.h"
68 #include "ust-thread.h"
69 #include "jul-thread.h"
70
71 #define CONSUMERD_FILE "lttng-consumerd"
72
73 const char *progname;
74 static const char *tracing_group_name = DEFAULT_TRACING_GROUP;
75 static int tracing_group_name_override;
76 static char *opt_pidfile;
77 static int opt_sig_parent;
78 static int opt_verbose_consumer;
79 static int opt_daemon;
80 static int opt_no_kernel;
81 static int is_root; /* Set to 1 if the daemon is running as root */
82 static pid_t ppid; /* Parent PID for --sig-parent option */
83 static pid_t child_ppid; /* Internal parent PID use with daemonize. */
84 static char *rundir;
85
86 /* Set to 1 when a SIGUSR1 signal is received. */
87 static int recv_child_signal;
88
89 /*
90 * Consumer daemon specific control data. Every value not initialized here is
91 * set to 0 by the static definition.
92 */
93 static struct consumer_data kconsumer_data = {
94 .type = LTTNG_CONSUMER_KERNEL,
95 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
96 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
97 .err_sock = -1,
98 .cmd_sock = -1,
99 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
100 .lock = PTHREAD_MUTEX_INITIALIZER,
101 .cond = PTHREAD_COND_INITIALIZER,
102 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 .err_sock = -1,
109 .cmd_sock = -1,
110 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
111 .lock = PTHREAD_MUTEX_INITIALIZER,
112 .cond = PTHREAD_COND_INITIALIZER,
113 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
114 };
115 static struct consumer_data ustconsumer32_data = {
116 .type = LTTNG_CONSUMER32_UST,
117 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
118 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
119 .err_sock = -1,
120 .cmd_sock = -1,
121 .pid_mutex = PTHREAD_MUTEX_INITIALIZER,
122 .lock = PTHREAD_MUTEX_INITIALIZER,
123 .cond = PTHREAD_COND_INITIALIZER,
124 .cond_mutex = PTHREAD_MUTEX_INITIALIZER,
125 };
126
127 /* Command line options */
128 static const struct option long_options[] = {
129 { "client-sock", 1, 0, 'c' },
130 { "apps-sock", 1, 0, 'a' },
131 { "kconsumerd-cmd-sock", 1, 0, 'C' },
132 { "kconsumerd-err-sock", 1, 0, 'E' },
133 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
134 { "ustconsumerd32-err-sock", 1, 0, 'H' },
135 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
136 { "ustconsumerd64-err-sock", 1, 0, 'F' },
137 { "consumerd32-path", 1, 0, 'u' },
138 { "consumerd32-libdir", 1, 0, 'U' },
139 { "consumerd64-path", 1, 0, 't' },
140 { "consumerd64-libdir", 1, 0, 'T' },
141 { "daemonize", 0, 0, 'd' },
142 { "sig-parent", 0, 0, 'S' },
143 { "help", 0, 0, 'h' },
144 { "group", 1, 0, 'g' },
145 { "version", 0, 0, 'V' },
146 { "quiet", 0, 0, 'q' },
147 { "verbose", 0, 0, 'v' },
148 { "verbose-consumer", 0, 0, 'Z' },
149 { "no-kernel", 0, 0, 'N' },
150 { "pidfile", 1, 0, 'p' },
151 { "jul-tcp-port", 1, 0, 'J' },
152 { "config", 1, 0, 'f' },
153 { NULL, 0, 0, 0 }
154 };
155
156 /* Command line options to ignore from configuration file */
157 static const char *config_ignore_options[] = { "help", "version", "config" };
158
159 /* Shared between threads */
160 static int dispatch_thread_exit;
161
162 /* Global application Unix socket path */
163 static char apps_unix_sock_path[PATH_MAX];
164 /* Global client Unix socket path */
165 static char client_unix_sock_path[PATH_MAX];
166 /* global wait shm path for UST */
167 static char wait_shm_path[PATH_MAX];
168 /* Global health check unix path */
169 static char health_unix_sock_path[PATH_MAX];
170
171 /* Sockets and FDs */
172 static int client_sock = -1;
173 static int apps_sock = -1;
174 int kernel_tracer_fd = -1;
175 static int kernel_poll_pipe[2] = { -1, -1 };
176
177 /*
178 * Quit pipe for all threads. This permits a single cancellation point
179 * for all threads when receiving an event on the pipe.
180 */
181 static int thread_quit_pipe[2] = { -1, -1 };
182
183 /*
184 * This pipe is used to inform the thread managing application communication
185 * that a command is queued and ready to be processed.
186 */
187 static int apps_cmd_pipe[2] = { -1, -1 };
188
189 int apps_cmd_notify_pipe[2] = { -1, -1 };
190
191 /* Pthread, Mutexes and Semaphores */
192 static pthread_t apps_thread;
193 static pthread_t apps_notify_thread;
194 static pthread_t reg_apps_thread;
195 static pthread_t client_thread;
196 static pthread_t kernel_thread;
197 static pthread_t dispatch_thread;
198 static pthread_t health_thread;
199 static pthread_t ht_cleanup_thread;
200 static pthread_t jul_reg_thread;
201
202 /*
203 * UST registration command queue. This queue is tied with a futex and uses a N
204 * wakers / 1 waiter implemented and detailed in futex.c/.h
205 *
206 * The thread_manage_apps and thread_dispatch_ust_registration interact with
207 * this queue and the wait/wake scheme.
208 */
209 static struct ust_cmd_queue ust_cmd_queue;
210
211 /*
212 * Pointer initialized before thread creation.
213 *
214 * This points to the tracing session list containing the session count and a
215 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
216 * MUST NOT be taken if you call a public function in session.c.
217 *
218 * The lock is nested inside the structure: session_list_ptr->lock. Please use
219 * session_lock_list and session_unlock_list for lock acquisition.
220 */
221 static struct ltt_session_list *session_list_ptr;
222
223 int ust_consumerd64_fd = -1;
224 int ust_consumerd32_fd = -1;
225
226 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
227 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
228 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
229 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
230 static int consumerd32_bin_override;
231 static int consumerd64_bin_override;
232 static int consumerd32_libdir_override;
233 static int consumerd64_libdir_override;
234
235 static const char *module_proc_lttng = "/proc/lttng";
236
237 /*
238 * Consumer daemon state which is changed when spawning it, killing it or in
239 * case of a fatal error.
240 */
241 enum consumerd_state {
242 CONSUMER_STARTED = 1,
243 CONSUMER_STOPPED = 2,
244 CONSUMER_ERROR = 3,
245 };
246
247 /*
248 * This consumer daemon state is used to validate if a client command will be
249 * able to reach the consumer. If not, the client is informed. For instance,
250 * doing a "lttng start" when the consumer state is set to ERROR will return an
251 * error to the client.
252 *
253 * The following example shows a possible race condition of this scheme:
254 *
255 * consumer thread error happens
256 * client cmd arrives
257 * client cmd checks state -> still OK
258 * consumer thread exit, sets error
259 * client cmd try to talk to consumer
260 * ...
261 *
262 * However, since the consumer is a different daemon, we have no way of making
263 * sure the command will reach it safely even with this state flag. This is why
264 * we consider that up to the state validation during command processing, the
265 * command is safe. After that, we can not guarantee the correctness of the
266 * client request vis-a-vis the consumer.
267 */
268 static enum consumerd_state ust_consumerd_state;
269 static enum consumerd_state kernel_consumerd_state;
270
271 /*
272 * Socket timeout for receiving and sending in seconds.
273 */
274 static int app_socket_timeout;
275
276 /* Set in main() with the current page size. */
277 long page_size;
278
279 /* Application health monitoring */
280 struct health_app *health_sessiond;
281
282 /* JUL TCP port for registration. Used by the JUL thread. */
283 unsigned int jul_tcp_port = DEFAULT_JUL_TCP_PORT;
284
285 const char * const config_section_name = "sessiond";
286
287 static
288 void setup_consumerd_path(void)
289 {
290 const char *bin, *libdir;
291
292 /*
293 * Allow INSTALL_BIN_PATH to be used as a target path for the
294 * native architecture size consumer if CONFIG_CONSUMER*_PATH
295 * has not been defined.
296 */
297 #if (CAA_BITS_PER_LONG == 32)
298 if (!consumerd32_bin[0]) {
299 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
300 }
301 if (!consumerd32_libdir[0]) {
302 consumerd32_libdir = INSTALL_LIB_PATH;
303 }
304 #elif (CAA_BITS_PER_LONG == 64)
305 if (!consumerd64_bin[0]) {
306 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
307 }
308 if (!consumerd64_libdir[0]) {
309 consumerd64_libdir = INSTALL_LIB_PATH;
310 }
311 #else
312 #error "Unknown bitness"
313 #endif
314
315 /*
316 * runtime env. var. overrides the build default.
317 */
318 bin = getenv("LTTNG_CONSUMERD32_BIN");
319 if (bin) {
320 consumerd32_bin = bin;
321 }
322 bin = getenv("LTTNG_CONSUMERD64_BIN");
323 if (bin) {
324 consumerd64_bin = bin;
325 }
326 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
327 if (libdir) {
328 consumerd32_libdir = libdir;
329 }
330 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
331 if (libdir) {
332 consumerd64_libdir = libdir;
333 }
334 }
335
336 /*
337 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
338 */
339 int sessiond_set_thread_pollset(struct lttng_poll_event *events, size_t size)
340 {
341 int ret;
342
343 assert(events);
344
345 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
346 if (ret < 0) {
347 goto error;
348 }
349
350 /* Add quit pipe */
351 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN | LPOLLERR);
352 if (ret < 0) {
353 goto error;
354 }
355
356 return 0;
357
358 error:
359 return ret;
360 }
361
362 /*
363 * Check if the thread quit pipe was triggered.
364 *
365 * Return 1 if it was triggered else 0;
366 */
367 int sessiond_check_thread_quit_pipe(int fd, uint32_t events)
368 {
369 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
370 return 1;
371 }
372
373 return 0;
374 }
375
376 /*
377 * Init thread quit pipe.
378 *
379 * Return -1 on error or 0 if all pipes are created.
380 */
381 static int init_thread_quit_pipe(void)
382 {
383 int ret, i;
384
385 ret = pipe(thread_quit_pipe);
386 if (ret < 0) {
387 PERROR("thread quit pipe");
388 goto error;
389 }
390
391 for (i = 0; i < 2; i++) {
392 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
393 if (ret < 0) {
394 PERROR("fcntl");
395 goto error;
396 }
397 }
398
399 error:
400 return ret;
401 }
402
403 /*
404 * Stop all threads by closing the thread quit pipe.
405 */
406 static void stop_threads(void)
407 {
408 int ret;
409
410 /* Stopping all threads */
411 DBG("Terminating all threads");
412 ret = notify_thread_pipe(thread_quit_pipe[1]);
413 if (ret < 0) {
414 ERR("write error on thread quit pipe");
415 }
416
417 /* Dispatch thread */
418 CMM_STORE_SHARED(dispatch_thread_exit, 1);
419 futex_nto1_wake(&ust_cmd_queue.futex);
420 }
421
422 /*
423 * Close every consumer sockets.
424 */
425 static void close_consumer_sockets(void)
426 {
427 int ret;
428
429 if (kconsumer_data.err_sock >= 0) {
430 ret = close(kconsumer_data.err_sock);
431 if (ret < 0) {
432 PERROR("kernel consumer err_sock close");
433 }
434 }
435 if (ustconsumer32_data.err_sock >= 0) {
436 ret = close(ustconsumer32_data.err_sock);
437 if (ret < 0) {
438 PERROR("UST consumerd32 err_sock close");
439 }
440 }
441 if (ustconsumer64_data.err_sock >= 0) {
442 ret = close(ustconsumer64_data.err_sock);
443 if (ret < 0) {
444 PERROR("UST consumerd64 err_sock close");
445 }
446 }
447 if (kconsumer_data.cmd_sock >= 0) {
448 ret = close(kconsumer_data.cmd_sock);
449 if (ret < 0) {
450 PERROR("kernel consumer cmd_sock close");
451 }
452 }
453 if (ustconsumer32_data.cmd_sock >= 0) {
454 ret = close(ustconsumer32_data.cmd_sock);
455 if (ret < 0) {
456 PERROR("UST consumerd32 cmd_sock close");
457 }
458 }
459 if (ustconsumer64_data.cmd_sock >= 0) {
460 ret = close(ustconsumer64_data.cmd_sock);
461 if (ret < 0) {
462 PERROR("UST consumerd64 cmd_sock close");
463 }
464 }
465 }
466
467 /*
468 * Cleanup the daemon
469 */
470 static void cleanup(void)
471 {
472 int ret;
473 struct ltt_session *sess, *stmp;
474 char path[PATH_MAX];
475
476 DBG("Cleaning up");
477
478 /*
479 * Close the thread quit pipe. It has already done its job,
480 * since we are now called.
481 */
482 utils_close_pipe(thread_quit_pipe);
483
484 /*
485 * If opt_pidfile is undefined, the default file will be wiped when
486 * removing the rundir.
487 */
488 if (opt_pidfile) {
489 ret = remove(opt_pidfile);
490 if (ret < 0) {
491 PERROR("remove pidfile %s", opt_pidfile);
492 }
493 }
494
495 DBG("Removing sessiond and consumerd content of directory %s", rundir);
496
497 /* sessiond */
498 snprintf(path, PATH_MAX,
499 "%s/%s",
500 rundir, DEFAULT_LTTNG_SESSIOND_PIDFILE);
501 DBG("Removing %s", path);
502 (void) unlink(path);
503
504 snprintf(path, PATH_MAX, "%s/%s", rundir,
505 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE);
506 DBG("Removing %s", path);
507 (void) unlink(path);
508
509 /* kconsumerd */
510 snprintf(path, PATH_MAX,
511 DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
512 rundir);
513 DBG("Removing %s", path);
514 (void) unlink(path);
515
516 snprintf(path, PATH_MAX,
517 DEFAULT_KCONSUMERD_PATH,
518 rundir);
519 DBG("Removing directory %s", path);
520 (void) rmdir(path);
521
522 /* ust consumerd 32 */
523 snprintf(path, PATH_MAX,
524 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
525 rundir);
526 DBG("Removing %s", path);
527 (void) unlink(path);
528
529 snprintf(path, PATH_MAX,
530 DEFAULT_USTCONSUMERD32_PATH,
531 rundir);
532 DBG("Removing directory %s", path);
533 (void) rmdir(path);
534
535 /* ust consumerd 64 */
536 snprintf(path, PATH_MAX,
537 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
538 rundir);
539 DBG("Removing %s", path);
540 (void) unlink(path);
541
542 snprintf(path, PATH_MAX,
543 DEFAULT_USTCONSUMERD64_PATH,
544 rundir);
545 DBG("Removing directory %s", path);
546 (void) rmdir(path);
547
548 /*
549 * We do NOT rmdir rundir because there are other processes
550 * using it, for instance lttng-relayd, which can start in
551 * parallel with this teardown.
552 */
553
554 free(rundir);
555
556 DBG("Cleaning up all sessions");
557
558 /* Destroy session list mutex */
559 if (session_list_ptr != NULL) {
560 pthread_mutex_destroy(&session_list_ptr->lock);
561
562 /* Cleanup ALL session */
563 cds_list_for_each_entry_safe(sess, stmp,
564 &session_list_ptr->head, list) {
565 cmd_destroy_session(sess, kernel_poll_pipe[1]);
566 }
567 }
568
569 DBG("Closing all UST sockets");
570 ust_app_clean_list();
571 buffer_reg_destroy_registries();
572
573 if (is_root && !opt_no_kernel) {
574 DBG2("Closing kernel fd");
575 if (kernel_tracer_fd >= 0) {
576 ret = close(kernel_tracer_fd);
577 if (ret) {
578 PERROR("close");
579 }
580 }
581 DBG("Unloading kernel modules");
582 modprobe_remove_lttng_all();
583 }
584
585 close_consumer_sockets();
586
587 /*
588 * If the override option is set, the pointer points to a *non* const thus
589 * freeing it even though the variable type is set to const.
590 */
591 if (tracing_group_name_override) {
592 free((void *) tracing_group_name);
593 }
594 if (consumerd32_bin_override) {
595 free((void *) consumerd32_bin);
596 }
597 if (consumerd64_bin_override) {
598 free((void *) consumerd64_bin);
599 }
600 if (consumerd32_libdir_override) {
601 free((void *) consumerd32_libdir);
602 }
603 if (consumerd64_libdir_override) {
604 free((void *) consumerd64_libdir);
605 }
606
607 if (opt_pidfile) {
608 free(opt_pidfile);
609 }
610
611 /* <fun> */
612 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
613 "Matthew, BEET driven development works!%c[%dm",
614 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
615 /* </fun> */
616 }
617
618 /*
619 * Send data on a unix socket using the liblttsessiondcomm API.
620 *
621 * Return lttcomm error code.
622 */
623 static int send_unix_sock(int sock, void *buf, size_t len)
624 {
625 /* Check valid length */
626 if (len == 0) {
627 return -1;
628 }
629
630 return lttcomm_send_unix_sock(sock, buf, len);
631 }
632
633 /*
634 * Free memory of a command context structure.
635 */
636 static void clean_command_ctx(struct command_ctx **cmd_ctx)
637 {
638 DBG("Clean command context structure");
639 if (*cmd_ctx) {
640 if ((*cmd_ctx)->llm) {
641 free((*cmd_ctx)->llm);
642 }
643 if ((*cmd_ctx)->lsm) {
644 free((*cmd_ctx)->lsm);
645 }
646 free(*cmd_ctx);
647 *cmd_ctx = NULL;
648 }
649 }
650
651 /*
652 * Notify UST applications using the shm mmap futex.
653 */
654 static int notify_ust_apps(int active)
655 {
656 char *wait_shm_mmap;
657
658 DBG("Notifying applications of session daemon state: %d", active);
659
660 /* See shm.c for this call implying mmap, shm and futex calls */
661 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
662 if (wait_shm_mmap == NULL) {
663 goto error;
664 }
665
666 /* Wake waiting process */
667 futex_wait_update((int32_t *) wait_shm_mmap, active);
668
669 /* Apps notified successfully */
670 return 0;
671
672 error:
673 return -1;
674 }
675
676 /*
677 * Setup the outgoing data buffer for the response (llm) by allocating the
678 * right amount of memory and copying the original information from the lsm
679 * structure.
680 *
681 * Return total size of the buffer pointed by buf.
682 */
683 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
684 {
685 int ret, buf_size;
686
687 buf_size = size;
688
689 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
690 if (cmd_ctx->llm == NULL) {
691 PERROR("zmalloc");
692 ret = -ENOMEM;
693 goto error;
694 }
695
696 /* Copy common data */
697 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
698 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
699
700 cmd_ctx->llm->data_size = size;
701 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
702
703 return buf_size;
704
705 error:
706 return ret;
707 }
708
709 /*
710 * Update the kernel poll set of all channel fd available over all tracing
711 * session. Add the wakeup pipe at the end of the set.
712 */
713 static int update_kernel_poll(struct lttng_poll_event *events)
714 {
715 int ret;
716 struct ltt_session *session;
717 struct ltt_kernel_channel *channel;
718
719 DBG("Updating kernel poll set");
720
721 session_lock_list();
722 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
723 session_lock(session);
724 if (session->kernel_session == NULL) {
725 session_unlock(session);
726 continue;
727 }
728
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
731 /* Add channel fd to the kernel poll set */
732 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
733 if (ret < 0) {
734 session_unlock(session);
735 goto error;
736 }
737 DBG("Channel fd %d added to kernel set", channel->fd);
738 }
739 session_unlock(session);
740 }
741 session_unlock_list();
742
743 return 0;
744
745 error:
746 session_unlock_list();
747 return -1;
748 }
749
750 /*
751 * Find the channel fd from 'fd' over all tracing session. When found, check
752 * for new channel stream and send those stream fds to the kernel consumer.
753 *
754 * Useful for CPU hotplug feature.
755 */
756 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
757 {
758 int ret = 0;
759 struct ltt_session *session;
760 struct ltt_kernel_session *ksess;
761 struct ltt_kernel_channel *channel;
762
763 DBG("Updating kernel streams for channel fd %d", fd);
764
765 session_lock_list();
766 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
767 session_lock(session);
768 if (session->kernel_session == NULL) {
769 session_unlock(session);
770 continue;
771 }
772 ksess = session->kernel_session;
773
774 cds_list_for_each_entry(channel, &ksess->channel_list.head, list) {
775 if (channel->fd == fd) {
776 DBG("Channel found, updating kernel streams");
777 ret = kernel_open_channel_stream(channel);
778 if (ret < 0) {
779 goto error;
780 }
781 /* Update the stream global counter */
782 ksess->stream_count_global += ret;
783
784 /*
785 * Have we already sent fds to the consumer? If yes, it means
786 * that tracing is started so it is safe to send our updated
787 * stream fds.
788 */
789 if (ksess->consumer_fds_sent == 1 && ksess->consumer != NULL) {
790 struct lttng_ht_iter iter;
791 struct consumer_socket *socket;
792
793 rcu_read_lock();
794 cds_lfht_for_each_entry(ksess->consumer->socks->ht,
795 &iter.iter, socket, node.node) {
796 pthread_mutex_lock(socket->lock);
797 ret = kernel_consumer_send_channel_stream(socket,
798 channel, ksess,
799 session->output_traces ? 1 : 0);
800 pthread_mutex_unlock(socket->lock);
801 if (ret < 0) {
802 rcu_read_unlock();
803 goto error;
804 }
805 }
806 rcu_read_unlock();
807 }
808 goto error;
809 }
810 }
811 session_unlock(session);
812 }
813 session_unlock_list();
814 return ret;
815
816 error:
817 session_unlock(session);
818 session_unlock_list();
819 return ret;
820 }
821
822 /*
823 * For each tracing session, update newly registered apps. The session list
824 * lock MUST be acquired before calling this.
825 */
826 static void update_ust_app(int app_sock)
827 {
828 struct ltt_session *sess, *stmp;
829
830 /* Consumer is in an ERROR state. Stop any application update. */
831 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
832 /* Stop the update process since the consumer is dead. */
833 return;
834 }
835
836 /* For all tracing session(s) */
837 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
838 session_lock(sess);
839 if (sess->ust_session) {
840 ust_app_global_update(sess->ust_session, app_sock);
841 }
842 session_unlock(sess);
843 }
844 }
845
846 /*
847 * This thread manage event coming from the kernel.
848 *
849 * Features supported in this thread:
850 * -) CPU Hotplug
851 */
852 static void *thread_manage_kernel(void *data)
853 {
854 int ret, i, pollfd, update_poll_flag = 1, err = -1;
855 uint32_t revents, nb_fd;
856 char tmp;
857 struct lttng_poll_event events;
858
859 DBG("[thread] Thread manage kernel started");
860
861 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL);
862
863 /*
864 * This first step of the while is to clean this structure which could free
865 * non NULL pointers so initialize it before the loop.
866 */
867 lttng_poll_init(&events);
868
869 if (testpoint(sessiond_thread_manage_kernel)) {
870 goto error_testpoint;
871 }
872
873 health_code_update();
874
875 if (testpoint(sessiond_thread_manage_kernel_before_loop)) {
876 goto error_testpoint;
877 }
878
879 while (1) {
880 health_code_update();
881
882 if (update_poll_flag == 1) {
883 /* Clean events object. We are about to populate it again. */
884 lttng_poll_clean(&events);
885
886 ret = sessiond_set_thread_pollset(&events, 2);
887 if (ret < 0) {
888 goto error_poll_create;
889 }
890
891 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
892 if (ret < 0) {
893 goto error;
894 }
895
896 /* This will add the available kernel channel if any. */
897 ret = update_kernel_poll(&events);
898 if (ret < 0) {
899 goto error;
900 }
901 update_poll_flag = 0;
902 }
903
904 DBG("Thread kernel polling on %d fds", LTTNG_POLL_GETNB(&events));
905
906 /* Poll infinite value of time */
907 restart:
908 health_poll_entry();
909 ret = lttng_poll_wait(&events, -1);
910 health_poll_exit();
911 if (ret < 0) {
912 /*
913 * Restart interrupted system call.
914 */
915 if (errno == EINTR) {
916 goto restart;
917 }
918 goto error;
919 } else if (ret == 0) {
920 /* Should not happen since timeout is infinite */
921 ERR("Return value of poll is 0 with an infinite timeout.\n"
922 "This should not have happened! Continuing...");
923 continue;
924 }
925
926 nb_fd = ret;
927
928 for (i = 0; i < nb_fd; i++) {
929 /* Fetch once the poll data */
930 revents = LTTNG_POLL_GETEV(&events, i);
931 pollfd = LTTNG_POLL_GETFD(&events, i);
932
933 health_code_update();
934
935 /* Thread quit pipe has been closed. Killing thread. */
936 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
937 if (ret) {
938 err = 0;
939 goto exit;
940 }
941
942 /* Check for data on kernel pipe */
943 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
944 (void) lttng_read(kernel_poll_pipe[0],
945 &tmp, 1);
946 /*
947 * Ret value is useless here, if this pipe gets any actions an
948 * update is required anyway.
949 */
950 update_poll_flag = 1;
951 continue;
952 } else {
953 /*
954 * New CPU detected by the kernel. Adding kernel stream to
955 * kernel session and updating the kernel consumer
956 */
957 if (revents & LPOLLIN) {
958 ret = update_kernel_stream(&kconsumer_data, pollfd);
959 if (ret < 0) {
960 continue;
961 }
962 break;
963 /*
964 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
965 * and unregister kernel stream at this point.
966 */
967 }
968 }
969 }
970 }
971
972 exit:
973 error:
974 lttng_poll_clean(&events);
975 error_poll_create:
976 error_testpoint:
977 utils_close_pipe(kernel_poll_pipe);
978 kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1;
979 if (err) {
980 health_error();
981 ERR("Health error occurred in %s", __func__);
982 WARN("Kernel thread died unexpectedly. "
983 "Kernel tracing can continue but CPU hotplug is disabled.");
984 }
985 health_unregister(health_sessiond);
986 DBG("Kernel thread dying");
987 return NULL;
988 }
989
990 /*
991 * Signal pthread condition of the consumer data that the thread.
992 */
993 static void signal_consumer_condition(struct consumer_data *data, int state)
994 {
995 pthread_mutex_lock(&data->cond_mutex);
996
997 /*
998 * The state is set before signaling. It can be any value, it's the waiter
999 * job to correctly interpret this condition variable associated to the
1000 * consumer pthread_cond.
1001 *
1002 * A value of 0 means that the corresponding thread of the consumer data
1003 * was not started. 1 indicates that the thread has started and is ready
1004 * for action. A negative value means that there was an error during the
1005 * thread bootstrap.
1006 */
1007 data->consumer_thread_is_ready = state;
1008 (void) pthread_cond_signal(&data->cond);
1009
1010 pthread_mutex_unlock(&data->cond_mutex);
1011 }
1012
1013 /*
1014 * This thread manage the consumer error sent back to the session daemon.
1015 */
1016 static void *thread_manage_consumer(void *data)
1017 {
1018 int sock = -1, i, ret, pollfd, err = -1;
1019 uint32_t revents, nb_fd;
1020 enum lttcomm_return_code code;
1021 struct lttng_poll_event events;
1022 struct consumer_data *consumer_data = data;
1023
1024 DBG("[thread] Manage consumer started");
1025
1026 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER);
1027
1028 health_code_update();
1029
1030 /*
1031 * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the
1032 * metadata_sock. Nothing more will be added to this poll set.
1033 */
1034 ret = sessiond_set_thread_pollset(&events, 3);
1035 if (ret < 0) {
1036 goto error_poll;
1037 }
1038
1039 /*
1040 * The error socket here is already in a listening state which was done
1041 * just before spawning this thread to avoid a race between the consumer
1042 * daemon exec trying to connect and the listen() call.
1043 */
1044 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
1045 if (ret < 0) {
1046 goto error;
1047 }
1048
1049 health_code_update();
1050
1051 /* Infinite blocking call, waiting for transmission */
1052 restart:
1053 health_poll_entry();
1054
1055 if (testpoint(sessiond_thread_manage_consumer)) {
1056 goto error;
1057 }
1058
1059 ret = lttng_poll_wait(&events, -1);
1060 health_poll_exit();
1061 if (ret < 0) {
1062 /*
1063 * Restart interrupted system call.
1064 */
1065 if (errno == EINTR) {
1066 goto restart;
1067 }
1068 goto error;
1069 }
1070
1071 nb_fd = ret;
1072
1073 for (i = 0; i < nb_fd; i++) {
1074 /* Fetch once the poll data */
1075 revents = LTTNG_POLL_GETEV(&events, i);
1076 pollfd = LTTNG_POLL_GETFD(&events, i);
1077
1078 health_code_update();
1079
1080 /* Thread quit pipe has been closed. Killing thread. */
1081 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1082 if (ret) {
1083 err = 0;
1084 goto exit;
1085 }
1086
1087 /* Event on the registration socket */
1088 if (pollfd == consumer_data->err_sock) {
1089 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1090 ERR("consumer err socket poll error");
1091 goto error;
1092 }
1093 }
1094 }
1095
1096 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1097 if (sock < 0) {
1098 goto error;
1099 }
1100
1101 /*
1102 * Set the CLOEXEC flag. Return code is useless because either way, the
1103 * show must go on.
1104 */
1105 (void) utils_set_fd_cloexec(sock);
1106
1107 health_code_update();
1108
1109 DBG2("Receiving code from consumer err_sock");
1110
1111 /* Getting status code from kconsumerd */
1112 ret = lttcomm_recv_unix_sock(sock, &code,
1113 sizeof(enum lttcomm_return_code));
1114 if (ret <= 0) {
1115 goto error;
1116 }
1117
1118 health_code_update();
1119
1120 if (code == LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) {
1121 /* Connect both socket, command and metadata. */
1122 consumer_data->cmd_sock =
1123 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1124 consumer_data->metadata_fd =
1125 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1126 if (consumer_data->cmd_sock < 0
1127 || consumer_data->metadata_fd < 0) {
1128 PERROR("consumer connect cmd socket");
1129 /* On error, signal condition and quit. */
1130 signal_consumer_condition(consumer_data, -1);
1131 goto error;
1132 }
1133 consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd;
1134 /* Create metadata socket lock. */
1135 consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t));
1136 if (consumer_data->metadata_sock.lock == NULL) {
1137 PERROR("zmalloc pthread mutex");
1138 ret = -1;
1139 goto error;
1140 }
1141 pthread_mutex_init(consumer_data->metadata_sock.lock, NULL);
1142
1143 signal_consumer_condition(consumer_data, 1);
1144 DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock);
1145 DBG("Consumer metadata socket ready (fd: %d)",
1146 consumer_data->metadata_fd);
1147 } else {
1148 ERR("consumer error when waiting for SOCK_READY : %s",
1149 lttcomm_get_readable_code(-code));
1150 goto error;
1151 }
1152
1153 /* Remove the consumerd error sock since we've established a connexion */
1154 ret = lttng_poll_del(&events, consumer_data->err_sock);
1155 if (ret < 0) {
1156 goto error;
1157 }
1158
1159 /* Add new accepted error socket. */
1160 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1161 if (ret < 0) {
1162 goto error;
1163 }
1164
1165 /* Add metadata socket that is successfully connected. */
1166 ret = lttng_poll_add(&events, consumer_data->metadata_fd,
1167 LPOLLIN | LPOLLRDHUP);
1168 if (ret < 0) {
1169 goto error;
1170 }
1171
1172 health_code_update();
1173
1174 /* Infinite blocking call, waiting for transmission */
1175 restart_poll:
1176 while (1) {
1177 health_poll_entry();
1178 ret = lttng_poll_wait(&events, -1);
1179 health_poll_exit();
1180 if (ret < 0) {
1181 /*
1182 * Restart interrupted system call.
1183 */
1184 if (errno == EINTR) {
1185 goto restart_poll;
1186 }
1187 goto error;
1188 }
1189
1190 nb_fd = ret;
1191
1192 for (i = 0; i < nb_fd; i++) {
1193 /* Fetch once the poll data */
1194 revents = LTTNG_POLL_GETEV(&events, i);
1195 pollfd = LTTNG_POLL_GETFD(&events, i);
1196
1197 health_code_update();
1198
1199 /* Thread quit pipe has been closed. Killing thread. */
1200 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1201 if (ret) {
1202 err = 0;
1203 goto exit;
1204 }
1205
1206 if (pollfd == sock) {
1207 /* Event on the consumerd socket */
1208 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1209 ERR("consumer err socket second poll error");
1210 goto error;
1211 }
1212 health_code_update();
1213 /* Wait for any kconsumerd error */
1214 ret = lttcomm_recv_unix_sock(sock, &code,
1215 sizeof(enum lttcomm_return_code));
1216 if (ret <= 0) {
1217 ERR("consumer closed the command socket");
1218 goto error;
1219 }
1220
1221 ERR("consumer return code : %s",
1222 lttcomm_get_readable_code(-code));
1223
1224 goto exit;
1225 } else if (pollfd == consumer_data->metadata_fd) {
1226 /* UST metadata requests */
1227 ret = ust_consumer_metadata_request(
1228 &consumer_data->metadata_sock);
1229 if (ret < 0) {
1230 ERR("Handling metadata request");
1231 goto error;
1232 }
1233 break;
1234 } else {
1235 ERR("Unknown pollfd");
1236 goto error;
1237 }
1238 }
1239 health_code_update();
1240 }
1241
1242 exit:
1243 error:
1244 /*
1245 * We lock here because we are about to close the sockets and some other
1246 * thread might be using them so get exclusive access which will abort all
1247 * other consumer command by other threads.
1248 */
1249 pthread_mutex_lock(&consumer_data->lock);
1250
1251 /* Immediately set the consumerd state to stopped */
1252 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
1253 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
1254 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
1255 consumer_data->type == LTTNG_CONSUMER32_UST) {
1256 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
1257 } else {
1258 /* Code flow error... */
1259 assert(0);
1260 }
1261
1262 if (consumer_data->err_sock >= 0) {
1263 ret = close(consumer_data->err_sock);
1264 if (ret) {
1265 PERROR("close");
1266 }
1267 consumer_data->err_sock = -1;
1268 }
1269 if (consumer_data->cmd_sock >= 0) {
1270 ret = close(consumer_data->cmd_sock);
1271 if (ret) {
1272 PERROR("close");
1273 }
1274 consumer_data->cmd_sock = -1;
1275 }
1276 if (*consumer_data->metadata_sock.fd_ptr >= 0) {
1277 ret = close(*consumer_data->metadata_sock.fd_ptr);
1278 if (ret) {
1279 PERROR("close");
1280 }
1281 }
1282
1283 if (sock >= 0) {
1284 ret = close(sock);
1285 if (ret) {
1286 PERROR("close");
1287 }
1288 }
1289
1290 unlink(consumer_data->err_unix_sock_path);
1291 unlink(consumer_data->cmd_unix_sock_path);
1292 consumer_data->pid = 0;
1293 pthread_mutex_unlock(&consumer_data->lock);
1294
1295 /* Cleanup metadata socket mutex. */
1296 pthread_mutex_destroy(consumer_data->metadata_sock.lock);
1297 free(consumer_data->metadata_sock.lock);
1298
1299 lttng_poll_clean(&events);
1300 error_poll:
1301 if (err) {
1302 health_error();
1303 ERR("Health error occurred in %s", __func__);
1304 }
1305 health_unregister(health_sessiond);
1306 DBG("consumer thread cleanup completed");
1307
1308 return NULL;
1309 }
1310
1311 /*
1312 * This thread manage application communication.
1313 */
1314 static void *thread_manage_apps(void *data)
1315 {
1316 int i, ret, pollfd, err = -1;
1317 ssize_t size_ret;
1318 uint32_t revents, nb_fd;
1319 struct lttng_poll_event events;
1320
1321 DBG("[thread] Manage application started");
1322
1323 rcu_register_thread();
1324 rcu_thread_online();
1325
1326 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE);
1327
1328 if (testpoint(sessiond_thread_manage_apps)) {
1329 goto error_testpoint;
1330 }
1331
1332 health_code_update();
1333
1334 ret = sessiond_set_thread_pollset(&events, 2);
1335 if (ret < 0) {
1336 goto error_poll_create;
1337 }
1338
1339 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1340 if (ret < 0) {
1341 goto error;
1342 }
1343
1344 if (testpoint(sessiond_thread_manage_apps_before_loop)) {
1345 goto error;
1346 }
1347
1348 health_code_update();
1349
1350 while (1) {
1351 DBG("Apps thread polling on %d fds", LTTNG_POLL_GETNB(&events));
1352
1353 /* Inifinite blocking call, waiting for transmission */
1354 restart:
1355 health_poll_entry();
1356 ret = lttng_poll_wait(&events, -1);
1357 health_poll_exit();
1358 if (ret < 0) {
1359 /*
1360 * Restart interrupted system call.
1361 */
1362 if (errno == EINTR) {
1363 goto restart;
1364 }
1365 goto error;
1366 }
1367
1368 nb_fd = ret;
1369
1370 for (i = 0; i < nb_fd; i++) {
1371 /* Fetch once the poll data */
1372 revents = LTTNG_POLL_GETEV(&events, i);
1373 pollfd = LTTNG_POLL_GETFD(&events, i);
1374
1375 health_code_update();
1376
1377 /* Thread quit pipe has been closed. Killing thread. */
1378 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1379 if (ret) {
1380 err = 0;
1381 goto exit;
1382 }
1383
1384 /* Inspect the apps cmd pipe */
1385 if (pollfd == apps_cmd_pipe[0]) {
1386 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1387 ERR("Apps command pipe error");
1388 goto error;
1389 } else if (revents & LPOLLIN) {
1390 int sock;
1391
1392 /* Empty pipe */
1393 size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock));
1394 if (size_ret < sizeof(sock)) {
1395 PERROR("read apps cmd pipe");
1396 goto error;
1397 }
1398
1399 health_code_update();
1400
1401 /*
1402 * We only monitor the error events of the socket. This
1403 * thread does not handle any incoming data from UST
1404 * (POLLIN).
1405 */
1406 ret = lttng_poll_add(&events, sock,
1407 LPOLLERR | LPOLLHUP | LPOLLRDHUP);
1408 if (ret < 0) {
1409 goto error;
1410 }
1411
1412 DBG("Apps with sock %d added to poll set", sock);
1413 }
1414 } else {
1415 /*
1416 * At this point, we know that a registered application made
1417 * the event at poll_wait.
1418 */
1419 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1420 /* Removing from the poll set */
1421 ret = lttng_poll_del(&events, pollfd);
1422 if (ret < 0) {
1423 goto error;
1424 }
1425
1426 /* Socket closed on remote end. */
1427 ust_app_unregister(pollfd);
1428 }
1429 }
1430
1431 health_code_update();
1432 }
1433 }
1434
1435 exit:
1436 error:
1437 lttng_poll_clean(&events);
1438 error_poll_create:
1439 error_testpoint:
1440 utils_close_pipe(apps_cmd_pipe);
1441 apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1;
1442
1443 /*
1444 * We don't clean the UST app hash table here since already registered
1445 * applications can still be controlled so let them be until the session
1446 * daemon dies or the applications stop.
1447 */
1448
1449 if (err) {
1450 health_error();
1451 ERR("Health error occurred in %s", __func__);
1452 }
1453 health_unregister(health_sessiond);
1454 DBG("Application communication apps thread cleanup complete");
1455 rcu_thread_offline();
1456 rcu_unregister_thread();
1457 return NULL;
1458 }
1459
1460 /*
1461 * Send a socket to a thread This is called from the dispatch UST registration
1462 * thread once all sockets are set for the application.
1463 *
1464 * The sock value can be invalid, we don't really care, the thread will handle
1465 * it and make the necessary cleanup if so.
1466 *
1467 * On success, return 0 else a negative value being the errno message of the
1468 * write().
1469 */
1470 static int send_socket_to_thread(int fd, int sock)
1471 {
1472 ssize_t ret;
1473
1474 /*
1475 * It's possible that the FD is set as invalid with -1 concurrently just
1476 * before calling this function being a shutdown state of the thread.
1477 */
1478 if (fd < 0) {
1479 ret = -EBADF;
1480 goto error;
1481 }
1482
1483 ret = lttng_write(fd, &sock, sizeof(sock));
1484 if (ret < sizeof(sock)) {
1485 PERROR("write apps pipe %d", fd);
1486 if (ret < 0) {
1487 ret = -errno;
1488 }
1489 goto error;
1490 }
1491
1492 /* All good. Don't send back the write positive ret value. */
1493 ret = 0;
1494 error:
1495 return (int) ret;
1496 }
1497
1498 /*
1499 * Sanitize the wait queue of the dispatch registration thread meaning removing
1500 * invalid nodes from it. This is to avoid memory leaks for the case the UST
1501 * notify socket is never received.
1502 */
1503 static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue)
1504 {
1505 int ret, nb_fd = 0, i;
1506 unsigned int fd_added = 0;
1507 struct lttng_poll_event events;
1508 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1509
1510 assert(wait_queue);
1511
1512 lttng_poll_init(&events);
1513
1514 /* Just skip everything for an empty queue. */
1515 if (!wait_queue->count) {
1516 goto end;
1517 }
1518
1519 ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC);
1520 if (ret < 0) {
1521 goto error_create;
1522 }
1523
1524 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1525 &wait_queue->head, head) {
1526 assert(wait_node->app);
1527 ret = lttng_poll_add(&events, wait_node->app->sock,
1528 LPOLLHUP | LPOLLERR);
1529 if (ret < 0) {
1530 goto error;
1531 }
1532
1533 fd_added = 1;
1534 }
1535
1536 if (!fd_added) {
1537 goto end;
1538 }
1539
1540 /*
1541 * Poll but don't block so we can quickly identify the faulty events and
1542 * clean them afterwards from the wait queue.
1543 */
1544 ret = lttng_poll_wait(&events, 0);
1545 if (ret < 0) {
1546 goto error;
1547 }
1548 nb_fd = ret;
1549
1550 for (i = 0; i < nb_fd; i++) {
1551 /* Get faulty FD. */
1552 uint32_t revents = LTTNG_POLL_GETEV(&events, i);
1553 int pollfd = LTTNG_POLL_GETFD(&events, i);
1554
1555 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1556 &wait_queue->head, head) {
1557 if (pollfd == wait_node->app->sock &&
1558 (revents & (LPOLLHUP | LPOLLERR))) {
1559 cds_list_del(&wait_node->head);
1560 wait_queue->count--;
1561 ust_app_destroy(wait_node->app);
1562 free(wait_node);
1563 break;
1564 }
1565 }
1566 }
1567
1568 if (nb_fd > 0) {
1569 DBG("Wait queue sanitized, %d node were cleaned up", nb_fd);
1570 }
1571
1572 end:
1573 lttng_poll_clean(&events);
1574 return;
1575
1576 error:
1577 lttng_poll_clean(&events);
1578 error_create:
1579 ERR("Unable to sanitize wait queue");
1580 return;
1581 }
1582
1583 /*
1584 * Dispatch request from the registration threads to the application
1585 * communication thread.
1586 */
1587 static void *thread_dispatch_ust_registration(void *data)
1588 {
1589 int ret, err = -1;
1590 struct cds_wfq_node *node;
1591 struct ust_command *ust_cmd = NULL;
1592 struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node;
1593 struct ust_reg_wait_queue wait_queue = {
1594 .count = 0,
1595 };
1596
1597 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH);
1598
1599 health_code_update();
1600
1601 CDS_INIT_LIST_HEAD(&wait_queue.head);
1602
1603 DBG("[thread] Dispatch UST command started");
1604
1605 while (!CMM_LOAD_SHARED(dispatch_thread_exit)) {
1606 health_code_update();
1607
1608 /* Atomically prepare the queue futex */
1609 futex_nto1_prepare(&ust_cmd_queue.futex);
1610
1611 do {
1612 struct ust_app *app = NULL;
1613 ust_cmd = NULL;
1614
1615 /*
1616 * Make sure we don't have node(s) that have hung up before receiving
1617 * the notify socket. This is to clean the list in order to avoid
1618 * memory leaks from notify socket that are never seen.
1619 */
1620 sanitize_wait_queue(&wait_queue);
1621
1622 health_code_update();
1623 /* Dequeue command for registration */
1624 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1625 if (node == NULL) {
1626 DBG("Woken up but nothing in the UST command queue");
1627 /* Continue thread execution */
1628 break;
1629 }
1630
1631 ust_cmd = caa_container_of(node, struct ust_command, node);
1632
1633 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1634 " gid:%d sock:%d name:%s (version %d.%d)",
1635 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1636 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1637 ust_cmd->sock, ust_cmd->reg_msg.name,
1638 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1639
1640 if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) {
1641 wait_node = zmalloc(sizeof(*wait_node));
1642 if (!wait_node) {
1643 PERROR("zmalloc wait_node dispatch");
1644 ret = close(ust_cmd->sock);
1645 if (ret < 0) {
1646 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1647 }
1648 lttng_fd_put(LTTNG_FD_APPS, 1);
1649 free(ust_cmd);
1650 goto error;
1651 }
1652 CDS_INIT_LIST_HEAD(&wait_node->head);
1653
1654 /* Create application object if socket is CMD. */
1655 wait_node->app = ust_app_create(&ust_cmd->reg_msg,
1656 ust_cmd->sock);
1657 if (!wait_node->app) {
1658 ret = close(ust_cmd->sock);
1659 if (ret < 0) {
1660 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1661 }
1662 lttng_fd_put(LTTNG_FD_APPS, 1);
1663 free(wait_node);
1664 free(ust_cmd);
1665 continue;
1666 }
1667 /*
1668 * Add application to the wait queue so we can set the notify
1669 * socket before putting this object in the global ht.
1670 */
1671 cds_list_add(&wait_node->head, &wait_queue.head);
1672 wait_queue.count++;
1673
1674 free(ust_cmd);
1675 /*
1676 * We have to continue here since we don't have the notify
1677 * socket and the application MUST be added to the hash table
1678 * only at that moment.
1679 */
1680 continue;
1681 } else {
1682 /*
1683 * Look for the application in the local wait queue and set the
1684 * notify socket if found.
1685 */
1686 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1687 &wait_queue.head, head) {
1688 health_code_update();
1689 if (wait_node->app->pid == ust_cmd->reg_msg.pid) {
1690 wait_node->app->notify_sock = ust_cmd->sock;
1691 cds_list_del(&wait_node->head);
1692 wait_queue.count--;
1693 app = wait_node->app;
1694 free(wait_node);
1695 DBG3("UST app notify socket %d is set", ust_cmd->sock);
1696 break;
1697 }
1698 }
1699
1700 /*
1701 * With no application at this stage the received socket is
1702 * basically useless so close it before we free the cmd data
1703 * structure for good.
1704 */
1705 if (!app) {
1706 ret = close(ust_cmd->sock);
1707 if (ret < 0) {
1708 PERROR("close ust sock dispatch %d", ust_cmd->sock);
1709 }
1710 lttng_fd_put(LTTNG_FD_APPS, 1);
1711 }
1712 free(ust_cmd);
1713 }
1714
1715 if (app) {
1716 /*
1717 * @session_lock_list
1718 *
1719 * Lock the global session list so from the register up to the
1720 * registration done message, no thread can see the application
1721 * and change its state.
1722 */
1723 session_lock_list();
1724 rcu_read_lock();
1725
1726 /*
1727 * Add application to the global hash table. This needs to be
1728 * done before the update to the UST registry can locate the
1729 * application.
1730 */
1731 ust_app_add(app);
1732
1733 /* Set app version. This call will print an error if needed. */
1734 (void) ust_app_version(app);
1735
1736 /* Send notify socket through the notify pipe. */
1737 ret = send_socket_to_thread(apps_cmd_notify_pipe[1],
1738 app->notify_sock);
1739 if (ret < 0) {
1740 rcu_read_unlock();
1741 session_unlock_list();
1742 /*
1743 * No notify thread, stop the UST tracing. However, this is
1744 * not an internal error of the this thread thus setting
1745 * the health error code to a normal exit.
1746 */
1747 err = 0;
1748 goto error;
1749 }
1750
1751 /*
1752 * Update newly registered application with the tracing
1753 * registry info already enabled information.
1754 */
1755 update_ust_app(app->sock);
1756
1757 /*
1758 * Don't care about return value. Let the manage apps threads
1759 * handle app unregistration upon socket close.
1760 */
1761 (void) ust_app_register_done(app->sock);
1762
1763 /*
1764 * Even if the application socket has been closed, send the app
1765 * to the thread and unregistration will take place at that
1766 * place.
1767 */
1768 ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock);
1769 if (ret < 0) {
1770 rcu_read_unlock();
1771 session_unlock_list();
1772 /*
1773 * No apps. thread, stop the UST tracing. However, this is
1774 * not an internal error of the this thread thus setting
1775 * the health error code to a normal exit.
1776 */
1777 err = 0;
1778 goto error;
1779 }
1780
1781 rcu_read_unlock();
1782 session_unlock_list();
1783 }
1784 } while (node != NULL);
1785
1786 health_poll_entry();
1787 /* Futex wait on queue. Blocking call on futex() */
1788 futex_nto1_wait(&ust_cmd_queue.futex);
1789 health_poll_exit();
1790 }
1791 /* Normal exit, no error */
1792 err = 0;
1793
1794 error:
1795 /* Clean up wait queue. */
1796 cds_list_for_each_entry_safe(wait_node, tmp_wait_node,
1797 &wait_queue.head, head) {
1798 cds_list_del(&wait_node->head);
1799 wait_queue.count--;
1800 free(wait_node);
1801 }
1802
1803 DBG("Dispatch thread dying");
1804 if (err) {
1805 health_error();
1806 ERR("Health error occurred in %s", __func__);
1807 }
1808 health_unregister(health_sessiond);
1809 return NULL;
1810 }
1811
1812 /*
1813 * This thread manage application registration.
1814 */
1815 static void *thread_registration_apps(void *data)
1816 {
1817 int sock = -1, i, ret, pollfd, err = -1;
1818 uint32_t revents, nb_fd;
1819 struct lttng_poll_event events;
1820 /*
1821 * Get allocated in this thread, enqueued to a global queue, dequeued and
1822 * freed in the manage apps thread.
1823 */
1824 struct ust_command *ust_cmd = NULL;
1825
1826 DBG("[thread] Manage application registration started");
1827
1828 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG);
1829
1830 if (testpoint(sessiond_thread_registration_apps)) {
1831 goto error_testpoint;
1832 }
1833
1834 ret = lttcomm_listen_unix_sock(apps_sock);
1835 if (ret < 0) {
1836 goto error_listen;
1837 }
1838
1839 /*
1840 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1841 * more will be added to this poll set.
1842 */
1843 ret = sessiond_set_thread_pollset(&events, 2);
1844 if (ret < 0) {
1845 goto error_create_poll;
1846 }
1847
1848 /* Add the application registration socket */
1849 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1850 if (ret < 0) {
1851 goto error_poll_add;
1852 }
1853
1854 /* Notify all applications to register */
1855 ret = notify_ust_apps(1);
1856 if (ret < 0) {
1857 ERR("Failed to notify applications or create the wait shared memory.\n"
1858 "Execution continues but there might be problem for already\n"
1859 "running applications that wishes to register.");
1860 }
1861
1862 while (1) {
1863 DBG("Accepting application registration");
1864
1865 /* Inifinite blocking call, waiting for transmission */
1866 restart:
1867 health_poll_entry();
1868 ret = lttng_poll_wait(&events, -1);
1869 health_poll_exit();
1870 if (ret < 0) {
1871 /*
1872 * Restart interrupted system call.
1873 */
1874 if (errno == EINTR) {
1875 goto restart;
1876 }
1877 goto error;
1878 }
1879
1880 nb_fd = ret;
1881
1882 for (i = 0; i < nb_fd; i++) {
1883 health_code_update();
1884
1885 /* Fetch once the poll data */
1886 revents = LTTNG_POLL_GETEV(&events, i);
1887 pollfd = LTTNG_POLL_GETFD(&events, i);
1888
1889 /* Thread quit pipe has been closed. Killing thread. */
1890 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
1891 if (ret) {
1892 err = 0;
1893 goto exit;
1894 }
1895
1896 /* Event on the registration socket */
1897 if (pollfd == apps_sock) {
1898 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1899 ERR("Register apps socket poll error");
1900 goto error;
1901 } else if (revents & LPOLLIN) {
1902 sock = lttcomm_accept_unix_sock(apps_sock);
1903 if (sock < 0) {
1904 goto error;
1905 }
1906
1907 /*
1908 * Set socket timeout for both receiving and ending.
1909 * app_socket_timeout is in seconds, whereas
1910 * lttcomm_setsockopt_rcv_timeout and
1911 * lttcomm_setsockopt_snd_timeout expect msec as
1912 * parameter.
1913 */
1914 (void) lttcomm_setsockopt_rcv_timeout(sock,
1915 app_socket_timeout * 1000);
1916 (void) lttcomm_setsockopt_snd_timeout(sock,
1917 app_socket_timeout * 1000);
1918
1919 /*
1920 * Set the CLOEXEC flag. Return code is useless because
1921 * either way, the show must go on.
1922 */
1923 (void) utils_set_fd_cloexec(sock);
1924
1925 /* Create UST registration command for enqueuing */
1926 ust_cmd = zmalloc(sizeof(struct ust_command));
1927 if (ust_cmd == NULL) {
1928 PERROR("ust command zmalloc");
1929 goto error;
1930 }
1931
1932 /*
1933 * Using message-based transmissions to ensure we don't
1934 * have to deal with partially received messages.
1935 */
1936 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1937 if (ret < 0) {
1938 ERR("Exhausted file descriptors allowed for applications.");
1939 free(ust_cmd);
1940 ret = close(sock);
1941 if (ret) {
1942 PERROR("close");
1943 }
1944 sock = -1;
1945 continue;
1946 }
1947
1948 health_code_update();
1949 ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg);
1950 if (ret < 0) {
1951 free(ust_cmd);
1952 /* Close socket of the application. */
1953 ret = close(sock);
1954 if (ret) {
1955 PERROR("close");
1956 }
1957 lttng_fd_put(LTTNG_FD_APPS, 1);
1958 sock = -1;
1959 continue;
1960 }
1961 health_code_update();
1962
1963 ust_cmd->sock = sock;
1964 sock = -1;
1965
1966 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1967 " gid:%d sock:%d name:%s (version %d.%d)",
1968 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1969 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1970 ust_cmd->sock, ust_cmd->reg_msg.name,
1971 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1972
1973 /*
1974 * Lock free enqueue the registration request. The red pill
1975 * has been taken! This apps will be part of the *system*.
1976 */
1977 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1978
1979 /*
1980 * Wake the registration queue futex. Implicit memory
1981 * barrier with the exchange in cds_wfq_enqueue.
1982 */
1983 futex_nto1_wake(&ust_cmd_queue.futex);
1984 }
1985 }
1986 }
1987 }
1988
1989 exit:
1990 error:
1991 if (err) {
1992 health_error();
1993 ERR("Health error occurred in %s", __func__);
1994 }
1995
1996 /* Notify that the registration thread is gone */
1997 notify_ust_apps(0);
1998
1999 if (apps_sock >= 0) {
2000 ret = close(apps_sock);
2001 if (ret) {
2002 PERROR("close");
2003 }
2004 }
2005 if (sock >= 0) {
2006 ret = close(sock);
2007 if (ret) {
2008 PERROR("close");
2009 }
2010 lttng_fd_put(LTTNG_FD_APPS, 1);
2011 }
2012 unlink(apps_unix_sock_path);
2013
2014 error_poll_add:
2015 lttng_poll_clean(&events);
2016 error_listen:
2017 error_create_poll:
2018 error_testpoint:
2019 DBG("UST Registration thread cleanup complete");
2020 health_unregister(health_sessiond);
2021
2022 return NULL;
2023 }
2024
2025 /*
2026 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
2027 * exec or it will fails.
2028 */
2029 static int spawn_consumer_thread(struct consumer_data *consumer_data)
2030 {
2031 int ret, clock_ret;
2032 struct timespec timeout;
2033
2034 /* Make sure we set the readiness flag to 0 because we are NOT ready */
2035 consumer_data->consumer_thread_is_ready = 0;
2036
2037 /* Setup pthread condition */
2038 ret = pthread_condattr_init(&consumer_data->condattr);
2039 if (ret != 0) {
2040 errno = ret;
2041 PERROR("pthread_condattr_init consumer data");
2042 goto error;
2043 }
2044
2045 /*
2046 * Set the monotonic clock in order to make sure we DO NOT jump in time
2047 * between the clock_gettime() call and the timedwait call. See bug #324
2048 * for a more details and how we noticed it.
2049 */
2050 ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC);
2051 if (ret != 0) {
2052 errno = ret;
2053 PERROR("pthread_condattr_setclock consumer data");
2054 goto error;
2055 }
2056
2057 ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr);
2058 if (ret != 0) {
2059 errno = ret;
2060 PERROR("pthread_cond_init consumer data");
2061 goto error;
2062 }
2063
2064 ret = pthread_create(&consumer_data->thread, NULL, thread_manage_consumer,
2065 consumer_data);
2066 if (ret != 0) {
2067 PERROR("pthread_create consumer");
2068 ret = -1;
2069 goto error;
2070 }
2071
2072 /* We are about to wait on a pthread condition */
2073 pthread_mutex_lock(&consumer_data->cond_mutex);
2074
2075 /* Get time for sem_timedwait absolute timeout */
2076 clock_ret = clock_gettime(CLOCK_MONOTONIC, &timeout);
2077 /*
2078 * Set the timeout for the condition timed wait even if the clock gettime
2079 * call fails since we might loop on that call and we want to avoid to
2080 * increment the timeout too many times.
2081 */
2082 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
2083
2084 /*
2085 * The following loop COULD be skipped in some conditions so this is why we
2086 * set ret to 0 in order to make sure at least one round of the loop is
2087 * done.
2088 */
2089 ret = 0;
2090
2091 /*
2092 * Loop until the condition is reached or when a timeout is reached. Note
2093 * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT
2094 * be returned but the pthread_cond(3), from the glibc-doc, says that it is
2095 * possible. This loop does not take any chances and works with both of
2096 * them.
2097 */
2098 while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) {
2099 if (clock_ret < 0) {
2100 PERROR("clock_gettime spawn consumer");
2101 /* Infinite wait for the consumerd thread to be ready */
2102 ret = pthread_cond_wait(&consumer_data->cond,
2103 &consumer_data->cond_mutex);
2104 } else {
2105 ret = pthread_cond_timedwait(&consumer_data->cond,
2106 &consumer_data->cond_mutex, &timeout);
2107 }
2108 }
2109
2110 /* Release the pthread condition */
2111 pthread_mutex_unlock(&consumer_data->cond_mutex);
2112
2113 if (ret != 0) {
2114 errno = ret;
2115 if (ret == ETIMEDOUT) {
2116 /*
2117 * Call has timed out so we kill the kconsumerd_thread and return
2118 * an error.
2119 */
2120 ERR("Condition timed out. The consumer thread was never ready."
2121 " Killing it");
2122 ret = pthread_cancel(consumer_data->thread);
2123 if (ret < 0) {
2124 PERROR("pthread_cancel consumer thread");
2125 }
2126 } else {
2127 PERROR("pthread_cond_wait failed consumer thread");
2128 }
2129 goto error;
2130 }
2131
2132 pthread_mutex_lock(&consumer_data->pid_mutex);
2133 if (consumer_data->pid == 0) {
2134 ERR("Consumerd did not start");
2135 pthread_mutex_unlock(&consumer_data->pid_mutex);
2136 goto error;
2137 }
2138 pthread_mutex_unlock(&consumer_data->pid_mutex);
2139
2140 return 0;
2141
2142 error:
2143 return ret;
2144 }
2145
2146 /*
2147 * Join consumer thread
2148 */
2149 static int join_consumer_thread(struct consumer_data *consumer_data)
2150 {
2151 void *status;
2152
2153 /* Consumer pid must be a real one. */
2154 if (consumer_data->pid > 0) {
2155 int ret;
2156 ret = kill(consumer_data->pid, SIGTERM);
2157 if (ret) {
2158 ERR("Error killing consumer daemon");
2159 return ret;
2160 }
2161 return pthread_join(consumer_data->thread, &status);
2162 } else {
2163 return 0;
2164 }
2165 }
2166
2167 /*
2168 * Fork and exec a consumer daemon (consumerd).
2169 *
2170 * Return pid if successful else -1.
2171 */
2172 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
2173 {
2174 int ret;
2175 pid_t pid;
2176 const char *consumer_to_use;
2177 const char *verbosity;
2178 struct stat st;
2179
2180 DBG("Spawning consumerd");
2181
2182 pid = fork();
2183 if (pid == 0) {
2184 /*
2185 * Exec consumerd.
2186 */
2187 if (opt_verbose_consumer) {
2188 verbosity = "--verbose";
2189 } else {
2190 verbosity = "--quiet";
2191 }
2192 switch (consumer_data->type) {
2193 case LTTNG_CONSUMER_KERNEL:
2194 /*
2195 * Find out which consumerd to execute. We will first try the
2196 * 64-bit path, then the sessiond's installation directory, and
2197 * fallback on the 32-bit one,
2198 */
2199 DBG3("Looking for a kernel consumer at these locations:");
2200 DBG3(" 1) %s", consumerd64_bin);
2201 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
2202 DBG3(" 3) %s", consumerd32_bin);
2203 if (stat(consumerd64_bin, &st) == 0) {
2204 DBG3("Found location #1");
2205 consumer_to_use = consumerd64_bin;
2206 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
2207 DBG3("Found location #2");
2208 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
2209 } else if (stat(consumerd32_bin, &st) == 0) {
2210 DBG3("Found location #3");
2211 consumer_to_use = consumerd32_bin;
2212 } else {
2213 DBG("Could not find any valid consumerd executable");
2214 break;
2215 }
2216 DBG("Using kernel consumer at: %s", consumer_to_use);
2217 execl(consumer_to_use,
2218 "lttng-consumerd", verbosity, "-k",
2219 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2220 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2221 "--group", tracing_group_name,
2222 NULL);
2223 break;
2224 case LTTNG_CONSUMER64_UST:
2225 {
2226 char *tmpnew = NULL;
2227
2228 if (consumerd64_libdir[0] != '\0') {
2229 char *tmp;
2230 size_t tmplen;
2231
2232 tmp = getenv("LD_LIBRARY_PATH");
2233 if (!tmp) {
2234 tmp = "";
2235 }
2236 tmplen = strlen("LD_LIBRARY_PATH=")
2237 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
2238 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2239 if (!tmpnew) {
2240 ret = -ENOMEM;
2241 goto error;
2242 }
2243 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2244 strcat(tmpnew, consumerd64_libdir);
2245 if (tmp[0] != '\0') {
2246 strcat(tmpnew, ":");
2247 strcat(tmpnew, tmp);
2248 }
2249 ret = putenv(tmpnew);
2250 if (ret) {
2251 ret = -errno;
2252 free(tmpnew);
2253 goto error;
2254 }
2255 }
2256 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
2257 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
2258 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2259 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2260 "--group", tracing_group_name,
2261 NULL);
2262 if (consumerd64_libdir[0] != '\0') {
2263 free(tmpnew);
2264 }
2265 if (ret) {
2266 goto error;
2267 }
2268 break;
2269 }
2270 case LTTNG_CONSUMER32_UST:
2271 {
2272 char *tmpnew = NULL;
2273
2274 if (consumerd32_libdir[0] != '\0') {
2275 char *tmp;
2276 size_t tmplen;
2277
2278 tmp = getenv("LD_LIBRARY_PATH");
2279 if (!tmp) {
2280 tmp = "";
2281 }
2282 tmplen = strlen("LD_LIBRARY_PATH=")
2283 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
2284 tmpnew = zmalloc(tmplen + 1 /* \0 */);
2285 if (!tmpnew) {
2286 ret = -ENOMEM;
2287 goto error;
2288 }
2289 strcpy(tmpnew, "LD_LIBRARY_PATH=");
2290 strcat(tmpnew, consumerd32_libdir);
2291 if (tmp[0] != '\0') {
2292 strcat(tmpnew, ":");
2293 strcat(tmpnew, tmp);
2294 }
2295 ret = putenv(tmpnew);
2296 if (ret) {
2297 ret = -errno;
2298 free(tmpnew);
2299 goto error;
2300 }
2301 }
2302 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
2303 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
2304 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
2305 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
2306 "--group", tracing_group_name,
2307 NULL);
2308 if (consumerd32_libdir[0] != '\0') {
2309 free(tmpnew);
2310 }
2311 if (ret) {
2312 goto error;
2313 }
2314 break;
2315 }
2316 default:
2317 PERROR("unknown consumer type");
2318 exit(EXIT_FAILURE);
2319 }
2320 if (errno != 0) {
2321 PERROR("kernel start consumer exec");
2322 }
2323 exit(EXIT_FAILURE);
2324 } else if (pid > 0) {
2325 ret = pid;
2326 } else {
2327 PERROR("start consumer fork");
2328 ret = -errno;
2329 }
2330 error:
2331 return ret;
2332 }
2333
2334 /*
2335 * Spawn the consumerd daemon and session daemon thread.
2336 */
2337 static int start_consumerd(struct consumer_data *consumer_data)
2338 {
2339 int ret;
2340
2341 /*
2342 * Set the listen() state on the socket since there is a possible race
2343 * between the exec() of the consumer daemon and this call if place in the
2344 * consumer thread. See bug #366 for more details.
2345 */
2346 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
2347 if (ret < 0) {
2348 goto error;
2349 }
2350
2351 pthread_mutex_lock(&consumer_data->pid_mutex);
2352 if (consumer_data->pid != 0) {
2353 pthread_mutex_unlock(&consumer_data->pid_mutex);
2354 goto end;
2355 }
2356
2357 ret = spawn_consumerd(consumer_data);
2358 if (ret < 0) {
2359 ERR("Spawning consumerd failed");
2360 pthread_mutex_unlock(&consumer_data->pid_mutex);
2361 goto error;
2362 }
2363
2364 /* Setting up the consumer_data pid */
2365 consumer_data->pid = ret;
2366 DBG2("Consumer pid %d", consumer_data->pid);
2367 pthread_mutex_unlock(&consumer_data->pid_mutex);
2368
2369 DBG2("Spawning consumer control thread");
2370 ret = spawn_consumer_thread(consumer_data);
2371 if (ret < 0) {
2372 ERR("Fatal error spawning consumer control thread");
2373 goto error;
2374 }
2375
2376 end:
2377 return 0;
2378
2379 error:
2380 /* Cleanup already created sockets on error. */
2381 if (consumer_data->err_sock >= 0) {
2382 int err;
2383
2384 err = close(consumer_data->err_sock);
2385 if (err < 0) {
2386 PERROR("close consumer data error socket");
2387 }
2388 }
2389 return ret;
2390 }
2391
2392 /*
2393 * Setup necessary data for kernel tracer action.
2394 */
2395 static int init_kernel_tracer(void)
2396 {
2397 int ret;
2398
2399 /* Modprobe lttng kernel modules */
2400 ret = modprobe_lttng_control();
2401 if (ret < 0) {
2402 goto error;
2403 }
2404
2405 /* Open debugfs lttng */
2406 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
2407 if (kernel_tracer_fd < 0) {
2408 DBG("Failed to open %s", module_proc_lttng);
2409 ret = -1;
2410 goto error_open;
2411 }
2412
2413 /* Validate kernel version */
2414 ret = kernel_validate_version(kernel_tracer_fd);
2415 if (ret < 0) {
2416 goto error_version;
2417 }
2418
2419 ret = modprobe_lttng_data();
2420 if (ret < 0) {
2421 goto error_modules;
2422 }
2423
2424 DBG("Kernel tracer fd %d", kernel_tracer_fd);
2425 return 0;
2426
2427 error_version:
2428 modprobe_remove_lttng_control();
2429 ret = close(kernel_tracer_fd);
2430 if (ret) {
2431 PERROR("close");
2432 }
2433 kernel_tracer_fd = -1;
2434 return LTTNG_ERR_KERN_VERSION;
2435
2436 error_modules:
2437 ret = close(kernel_tracer_fd);
2438 if (ret) {
2439 PERROR("close");
2440 }
2441
2442 error_open:
2443 modprobe_remove_lttng_control();
2444
2445 error:
2446 WARN("No kernel tracer available");
2447 kernel_tracer_fd = -1;
2448 if (!is_root) {
2449 return LTTNG_ERR_NEED_ROOT_SESSIOND;
2450 } else {
2451 return LTTNG_ERR_KERN_NA;
2452 }
2453 }
2454
2455
2456 /*
2457 * Copy consumer output from the tracing session to the domain session. The
2458 * function also applies the right modification on a per domain basis for the
2459 * trace files destination directory.
2460 *
2461 * Should *NOT* be called with RCU read-side lock held.
2462 */
2463 static int copy_session_consumer(int domain, struct ltt_session *session)
2464 {
2465 int ret;
2466 const char *dir_name;
2467 struct consumer_output *consumer;
2468
2469 assert(session);
2470 assert(session->consumer);
2471
2472 switch (domain) {
2473 case LTTNG_DOMAIN_KERNEL:
2474 DBG3("Copying tracing session consumer output in kernel session");
2475 /*
2476 * XXX: We should audit the session creation and what this function
2477 * does "extra" in order to avoid a destroy since this function is used
2478 * in the domain session creation (kernel and ust) only. Same for UST
2479 * domain.
2480 */
2481 if (session->kernel_session->consumer) {
2482 consumer_destroy_output(session->kernel_session->consumer);
2483 }
2484 session->kernel_session->consumer =
2485 consumer_copy_output(session->consumer);
2486 /* Ease our life a bit for the next part */
2487 consumer = session->kernel_session->consumer;
2488 dir_name = DEFAULT_KERNEL_TRACE_DIR;
2489 break;
2490 case LTTNG_DOMAIN_JUL:
2491 case LTTNG_DOMAIN_UST:
2492 DBG3("Copying tracing session consumer output in UST session");
2493 if (session->ust_session->consumer) {
2494 consumer_destroy_output(session->ust_session->consumer);
2495 }
2496 session->ust_session->consumer =
2497 consumer_copy_output(session->consumer);
2498 /* Ease our life a bit for the next part */
2499 consumer = session->ust_session->consumer;
2500 dir_name = DEFAULT_UST_TRACE_DIR;
2501 break;
2502 default:
2503 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2504 goto error;
2505 }
2506
2507 /* Append correct directory to subdir */
2508 strncat(consumer->subdir, dir_name,
2509 sizeof(consumer->subdir) - strlen(consumer->subdir) - 1);
2510 DBG3("Copy session consumer subdir %s", consumer->subdir);
2511
2512 ret = LTTNG_OK;
2513
2514 error:
2515 return ret;
2516 }
2517
2518 /*
2519 * Create an UST session and add it to the session ust list.
2520 *
2521 * Should *NOT* be called with RCU read-side lock held.
2522 */
2523 static int create_ust_session(struct ltt_session *session,
2524 struct lttng_domain *domain)
2525 {
2526 int ret;
2527 struct ltt_ust_session *lus = NULL;
2528
2529 assert(session);
2530 assert(domain);
2531 assert(session->consumer);
2532
2533 switch (domain->type) {
2534 case LTTNG_DOMAIN_JUL:
2535 case LTTNG_DOMAIN_UST:
2536 break;
2537 default:
2538 ERR("Unknown UST domain on create session %d", domain->type);
2539 ret = LTTNG_ERR_UNKNOWN_DOMAIN;
2540 goto error;
2541 }
2542
2543 DBG("Creating UST session");
2544
2545 lus = trace_ust_create_session(session->id);
2546 if (lus == NULL) {
2547 ret = LTTNG_ERR_UST_SESS_FAIL;
2548 goto error;
2549 }
2550
2551 lus->uid = session->uid;
2552 lus->gid = session->gid;
2553 lus->output_traces = session->output_traces;
2554 lus->snapshot_mode = session->snapshot_mode;
2555 lus->live_timer_interval = session->live_timer;
2556 session->ust_session = lus;
2557
2558 /* Copy session output to the newly created UST session */
2559 ret = copy_session_consumer(domain->type, session);
2560 if (ret != LTTNG_OK) {
2561 goto error;
2562 }
2563
2564 return LTTNG_OK;
2565
2566 error:
2567 free(lus);
2568 session->ust_session = NULL;
2569 return ret;
2570 }
2571
2572 /*
2573 * Create a kernel tracer session then create the default channel.
2574 */
2575 static int create_kernel_session(struct ltt_session *session)
2576 {
2577 int ret;
2578
2579 DBG("Creating kernel session");
2580
2581 ret = kernel_create_session(session, kernel_tracer_fd);
2582 if (ret < 0) {
2583 ret = LTTNG_ERR_KERN_SESS_FAIL;
2584 goto error;
2585 }
2586
2587 /* Code flow safety */
2588 assert(session->kernel_session);
2589
2590 /* Copy session output to the newly created Kernel session */
2591 ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session);
2592 if (ret != LTTNG_OK) {
2593 goto error;
2594 }
2595
2596 /* Create directory(ies) on local filesystem. */
2597 if (session->kernel_session->consumer->type == CONSUMER_DST_LOCAL &&
2598 strlen(session->kernel_session->consumer->dst.trace_path) > 0) {
2599 ret = run_as_mkdir_recursive(
2600 session->kernel_session->consumer->dst.trace_path,
2601 S_IRWXU | S_IRWXG, session->uid, session->gid);
2602 if (ret < 0) {
2603 if (ret != -EEXIST) {
2604 ERR("Trace directory creation error");
2605 goto error;
2606 }
2607 }
2608 }
2609
2610 session->kernel_session->uid = session->uid;
2611 session->kernel_session->gid = session->gid;
2612 session->kernel_session->output_traces = session->output_traces;
2613 session->kernel_session->snapshot_mode = session->snapshot_mode;
2614
2615 return LTTNG_OK;
2616
2617 error:
2618 trace_kernel_destroy_session(session->kernel_session);
2619 session->kernel_session = NULL;
2620 return ret;
2621 }
2622
2623 /*
2624 * Count number of session permitted by uid/gid.
2625 */
2626 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
2627 {
2628 unsigned int i = 0;
2629 struct ltt_session *session;
2630
2631 DBG("Counting number of available session for UID %d GID %d",
2632 uid, gid);
2633 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2634 /*
2635 * Only list the sessions the user can control.
2636 */
2637 if (!session_access_ok(session, uid, gid)) {
2638 continue;
2639 }
2640 i++;
2641 }
2642 return i;
2643 }
2644
2645 /*
2646 * Process the command requested by the lttng client within the command
2647 * context structure. This function make sure that the return structure (llm)
2648 * is set and ready for transmission before returning.
2649 *
2650 * Return any error encountered or 0 for success.
2651 *
2652 * "sock" is only used for special-case var. len data.
2653 *
2654 * Should *NOT* be called with RCU read-side lock held.
2655 */
2656 static int process_client_msg(struct command_ctx *cmd_ctx, int sock,
2657 int *sock_error)
2658 {
2659 int ret = LTTNG_OK;
2660 int need_tracing_session = 1;
2661 int need_domain;
2662
2663 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
2664
2665 *sock_error = 0;
2666
2667 switch (cmd_ctx->lsm->cmd_type) {
2668 case LTTNG_CREATE_SESSION:
2669 case LTTNG_CREATE_SESSION_SNAPSHOT:
2670 case LTTNG_CREATE_SESSION_LIVE:
2671 case LTTNG_DESTROY_SESSION:
2672 case LTTNG_LIST_SESSIONS:
2673 case LTTNG_LIST_DOMAINS:
2674 case LTTNG_START_TRACE:
2675 case LTTNG_STOP_TRACE:
2676 case LTTNG_DATA_PENDING:
2677 case LTTNG_SNAPSHOT_ADD_OUTPUT:
2678 case LTTNG_SNAPSHOT_DEL_OUTPUT:
2679 case LTTNG_SNAPSHOT_LIST_OUTPUT:
2680 case LTTNG_SNAPSHOT_RECORD:
2681 need_domain = 0;
2682 break;
2683 default:
2684 need_domain = 1;
2685 }
2686
2687 if (opt_no_kernel && need_domain
2688 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
2689 if (!is_root) {
2690 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2691 } else {
2692 ret = LTTNG_ERR_KERN_NA;
2693 }
2694 goto error;
2695 }
2696
2697 /* Deny register consumer if we already have a spawned consumer. */
2698 if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) {
2699 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2700 if (kconsumer_data.pid > 0) {
2701 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2702 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2703 goto error;
2704 }
2705 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2706 }
2707
2708 /*
2709 * Check for command that don't needs to allocate a returned payload. We do
2710 * this here so we don't have to make the call for no payload at each
2711 * command.
2712 */
2713 switch(cmd_ctx->lsm->cmd_type) {
2714 case LTTNG_LIST_SESSIONS:
2715 case LTTNG_LIST_TRACEPOINTS:
2716 case LTTNG_LIST_TRACEPOINT_FIELDS:
2717 case LTTNG_LIST_DOMAINS:
2718 case LTTNG_LIST_CHANNELS:
2719 case LTTNG_LIST_EVENTS:
2720 break;
2721 default:
2722 /* Setup lttng message with no payload */
2723 ret = setup_lttng_msg(cmd_ctx, 0);
2724 if (ret < 0) {
2725 /* This label does not try to unlock the session */
2726 goto init_setup_error;
2727 }
2728 }
2729
2730 /* Commands that DO NOT need a session. */
2731 switch (cmd_ctx->lsm->cmd_type) {
2732 case LTTNG_CREATE_SESSION:
2733 case LTTNG_CREATE_SESSION_SNAPSHOT:
2734 case LTTNG_CREATE_SESSION_LIVE:
2735 case LTTNG_CALIBRATE:
2736 case LTTNG_LIST_SESSIONS:
2737 case LTTNG_LIST_TRACEPOINTS:
2738 case LTTNG_LIST_TRACEPOINT_FIELDS:
2739 need_tracing_session = 0;
2740 break;
2741 default:
2742 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
2743 /*
2744 * We keep the session list lock across _all_ commands
2745 * for now, because the per-session lock does not
2746 * handle teardown properly.
2747 */
2748 session_lock_list();
2749 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
2750 if (cmd_ctx->session == NULL) {
2751 ret = LTTNG_ERR_SESS_NOT_FOUND;
2752 goto error;
2753 } else {
2754 /* Acquire lock for the session */
2755 session_lock(cmd_ctx->session);
2756 }
2757 break;
2758 }
2759
2760 if (!need_domain) {
2761 goto skip_domain;
2762 }
2763
2764 /*
2765 * Check domain type for specific "pre-action".
2766 */
2767 switch (cmd_ctx->lsm->domain.type) {
2768 case LTTNG_DOMAIN_KERNEL:
2769 if (!is_root) {
2770 ret = LTTNG_ERR_NEED_ROOT_SESSIOND;
2771 goto error;
2772 }
2773
2774 /* Kernel tracer check */
2775 if (kernel_tracer_fd == -1) {
2776 /* Basically, load kernel tracer modules */
2777 ret = init_kernel_tracer();
2778 if (ret != 0) {
2779 goto error;
2780 }
2781 }
2782
2783 /* Consumer is in an ERROR state. Report back to client */
2784 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
2785 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2786 goto error;
2787 }
2788
2789 /* Need a session for kernel command */
2790 if (need_tracing_session) {
2791 if (cmd_ctx->session->kernel_session == NULL) {
2792 ret = create_kernel_session(cmd_ctx->session);
2793 if (ret < 0) {
2794 ret = LTTNG_ERR_KERN_SESS_FAIL;
2795 goto error;
2796 }
2797 }
2798
2799 /* Start the kernel consumer daemon */
2800 pthread_mutex_lock(&kconsumer_data.pid_mutex);
2801 if (kconsumer_data.pid == 0 &&
2802 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2803 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2804 ret = start_consumerd(&kconsumer_data);
2805 if (ret < 0) {
2806 ret = LTTNG_ERR_KERN_CONSUMER_FAIL;
2807 goto error;
2808 }
2809 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
2810 } else {
2811 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
2812 }
2813
2814 /*
2815 * The consumer was just spawned so we need to add the socket to
2816 * the consumer output of the session if exist.
2817 */
2818 ret = consumer_create_socket(&kconsumer_data,
2819 cmd_ctx->session->kernel_session->consumer);
2820 if (ret < 0) {
2821 goto error;
2822 }
2823 }
2824
2825 break;
2826 case LTTNG_DOMAIN_JUL:
2827 case LTTNG_DOMAIN_UST:
2828 {
2829 if (!ust_app_supported()) {
2830 ret = LTTNG_ERR_NO_UST;
2831 goto error;
2832 }
2833 /* Consumer is in an ERROR state. Report back to client */
2834 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
2835 ret = LTTNG_ERR_NO_USTCONSUMERD;
2836 goto error;
2837 }
2838
2839 if (need_tracing_session) {
2840 /* Create UST session if none exist. */
2841 if (cmd_ctx->session->ust_session == NULL) {
2842 ret = create_ust_session(cmd_ctx->session,
2843 &cmd_ctx->lsm->domain);
2844 if (ret != LTTNG_OK) {
2845 goto error;
2846 }
2847 }
2848
2849 /* Start the UST consumer daemons */
2850 /* 64-bit */
2851 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
2852 if (consumerd64_bin[0] != '\0' &&
2853 ustconsumer64_data.pid == 0 &&
2854 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2855 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2856 ret = start_consumerd(&ustconsumer64_data);
2857 if (ret < 0) {
2858 ret = LTTNG_ERR_UST_CONSUMER64_FAIL;
2859 uatomic_set(&ust_consumerd64_fd, -EINVAL);
2860 goto error;
2861 }
2862
2863 uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock);
2864 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2865 } else {
2866 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
2867 }
2868
2869 /*
2870 * Setup socket for consumer 64 bit. No need for atomic access
2871 * since it was set above and can ONLY be set in this thread.
2872 */
2873 ret = consumer_create_socket(&ustconsumer64_data,
2874 cmd_ctx->session->ust_session->consumer);
2875 if (ret < 0) {
2876 goto error;
2877 }
2878
2879 /* 32-bit */
2880 if (consumerd32_bin[0] != '\0' &&
2881 ustconsumer32_data.pid == 0 &&
2882 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
2883 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2884 ret = start_consumerd(&ustconsumer32_data);
2885 if (ret < 0) {
2886 ret = LTTNG_ERR_UST_CONSUMER32_FAIL;
2887 uatomic_set(&ust_consumerd32_fd, -EINVAL);
2888 goto error;
2889 }
2890
2891 uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock);
2892 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
2893 } else {
2894 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
2895 }
2896
2897 /*
2898 * Setup socket for consumer 64 bit. No need for atomic access
2899 * since it was set above and can ONLY be set in this thread.
2900 */
2901 ret = consumer_create_socket(&ustconsumer32_data,
2902 cmd_ctx->session->ust_session->consumer);
2903 if (ret < 0) {
2904 goto error;
2905 }
2906 }
2907 break;
2908 }
2909 default:
2910 break;
2911 }
2912 skip_domain:
2913
2914 /* Validate consumer daemon state when start/stop trace command */
2915 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
2916 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
2917 switch (cmd_ctx->lsm->domain.type) {
2918 case LTTNG_DOMAIN_JUL:
2919 case LTTNG_DOMAIN_UST:
2920 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
2921 ret = LTTNG_ERR_NO_USTCONSUMERD;
2922 goto error;
2923 }
2924 break;
2925 case LTTNG_DOMAIN_KERNEL:
2926 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
2927 ret = LTTNG_ERR_NO_KERNCONSUMERD;
2928 goto error;
2929 }
2930 break;
2931 }
2932 }
2933
2934 /*
2935 * Check that the UID or GID match that of the tracing session.
2936 * The root user can interact with all sessions.
2937 */
2938 if (need_tracing_session) {
2939 if (!session_access_ok(cmd_ctx->session,
2940 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
2941 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
2942 ret = LTTNG_ERR_EPERM;
2943 goto error;
2944 }
2945 }
2946
2947 /*
2948 * Send relayd information to consumer as soon as we have a domain and a
2949 * session defined.
2950 */
2951 if (cmd_ctx->session && need_domain) {
2952 /*
2953 * Setup relayd if not done yet. If the relayd information was already
2954 * sent to the consumer, this call will gracefully return.
2955 */
2956 ret = cmd_setup_relayd(cmd_ctx->session);
2957 if (ret != LTTNG_OK) {
2958 goto error;
2959 }
2960 }
2961
2962 /* Process by command type */
2963 switch (cmd_ctx->lsm->cmd_type) {
2964 case LTTNG_ADD_CONTEXT:
2965 {
2966 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2967 cmd_ctx->lsm->u.context.channel_name,
2968 &cmd_ctx->lsm->u.context.ctx, kernel_poll_pipe[1]);
2969 break;
2970 }
2971 case LTTNG_DISABLE_CHANNEL:
2972 {
2973 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2974 cmd_ctx->lsm->u.disable.channel_name);
2975 break;
2976 }
2977 case LTTNG_DISABLE_EVENT:
2978 {
2979 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2980 cmd_ctx->lsm->u.disable.channel_name,
2981 cmd_ctx->lsm->u.disable.name);
2982 break;
2983 }
2984 case LTTNG_DISABLE_ALL_EVENT:
2985 {
2986 DBG("Disabling all events");
2987
2988 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
2989 cmd_ctx->lsm->u.disable.channel_name);
2990 break;
2991 }
2992 case LTTNG_ENABLE_CHANNEL:
2993 {
2994 ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain,
2995 &cmd_ctx->lsm->u.channel.chan, kernel_poll_pipe[1]);
2996 break;
2997 }
2998 case LTTNG_ENABLE_EVENT:
2999 {
3000 struct lttng_event_exclusion *exclusion = NULL;
3001 struct lttng_filter_bytecode *bytecode = NULL;
3002
3003 /* Handle exclusion events and receive it from the client. */
3004 if (cmd_ctx->lsm->u.enable.exclusion_count > 0) {
3005 size_t count = cmd_ctx->lsm->u.enable.exclusion_count;
3006
3007 exclusion = zmalloc(sizeof(struct lttng_event_exclusion) +
3008 (count * LTTNG_SYMBOL_NAME_LEN));
3009 if (!exclusion) {
3010 ret = LTTNG_ERR_EXCLUSION_NOMEM;
3011 goto error;
3012 }
3013
3014 DBG("Receiving var len exclusion event list from client ...");
3015 exclusion->count = count;
3016 ret = lttcomm_recv_unix_sock(sock, exclusion->names,
3017 count * LTTNG_SYMBOL_NAME_LEN);
3018 if (ret <= 0) {
3019 DBG("Nothing recv() from client var len data... continuing");
3020 *sock_error = 1;
3021 free(exclusion);
3022 ret = LTTNG_ERR_EXCLUSION_INVAL;
3023 goto error;
3024 }
3025 }
3026
3027 /* Handle filter and get bytecode from client. */
3028 if (cmd_ctx->lsm->u.enable.bytecode_len > 0) {
3029 size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len;
3030
3031 if (bytecode_len > LTTNG_FILTER_MAX_LEN) {
3032 ret = LTTNG_ERR_FILTER_INVAL;
3033 free(exclusion);
3034 goto error;
3035 }
3036
3037 bytecode = zmalloc(bytecode_len);
3038 if (!bytecode) {
3039 free(exclusion);
3040 ret = LTTNG_ERR_FILTER_NOMEM;
3041 goto error;
3042 }
3043
3044 /* Receive var. len. data */
3045 DBG("Receiving var len filter's bytecode from client ...");
3046 ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len);
3047 if (ret <= 0) {
3048 DBG("Nothing recv() from client car len data... continuing");
3049 *sock_error = 1;
3050 free(bytecode);
3051 free(exclusion);
3052 ret = LTTNG_ERR_FILTER_INVAL;
3053 goto error;
3054 }
3055
3056 if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) {
3057 free(bytecode);
3058 free(exclusion);
3059 ret = LTTNG_ERR_FILTER_INVAL;
3060 goto error;
3061 }
3062 }
3063
3064 ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain,
3065 cmd_ctx->lsm->u.enable.channel_name,
3066 &cmd_ctx->lsm->u.enable.event, bytecode, exclusion,
3067 kernel_poll_pipe[1]);
3068 break;
3069 }
3070 case LTTNG_ENABLE_ALL_EVENT:
3071 {
3072 DBG("Enabling all events");
3073
3074 ret = cmd_enable_event_all(cmd_ctx->session, &cmd_ctx->lsm->domain,
3075 cmd_ctx->lsm->u.enable.channel_name,
3076 cmd_ctx->lsm->u.enable.event.type, NULL, kernel_poll_pipe[1]);
3077 break;
3078 }
3079 case LTTNG_LIST_TRACEPOINTS:
3080 {
3081 struct lttng_event *events;
3082 ssize_t nb_events;
3083
3084 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3085 if (nb_events < 0) {
3086 /* Return value is a negative lttng_error_code. */
3087 ret = -nb_events;
3088 goto error;
3089 }
3090
3091 /*
3092 * Setup lttng message with payload size set to the event list size in
3093 * bytes and then copy list into the llm payload.
3094 */
3095 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3096 if (ret < 0) {
3097 free(events);
3098 goto setup_error;
3099 }
3100
3101 /* Copy event list into message payload */
3102 memcpy(cmd_ctx->llm->payload, events,
3103 sizeof(struct lttng_event) * nb_events);
3104
3105 free(events);
3106
3107 ret = LTTNG_OK;
3108 break;
3109 }
3110 case LTTNG_LIST_TRACEPOINT_FIELDS:
3111 {
3112 struct lttng_event_field *fields;
3113 ssize_t nb_fields;
3114
3115 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type,
3116 &fields);
3117 if (nb_fields < 0) {
3118 /* Return value is a negative lttng_error_code. */
3119 ret = -nb_fields;
3120 goto error;
3121 }
3122
3123 /*
3124 * Setup lttng message with payload size set to the event list size in
3125 * bytes and then copy list into the llm payload.
3126 */
3127 ret = setup_lttng_msg(cmd_ctx,
3128 sizeof(struct lttng_event_field) * nb_fields);
3129 if (ret < 0) {
3130 free(fields);
3131 goto setup_error;
3132 }
3133
3134 /* Copy event list into message payload */
3135 memcpy(cmd_ctx->llm->payload, fields,
3136 sizeof(struct lttng_event_field) * nb_fields);
3137
3138 free(fields);
3139
3140 ret = LTTNG_OK;
3141 break;
3142 }
3143 case LTTNG_SET_CONSUMER_URI:
3144 {
3145 size_t nb_uri, len;
3146 struct lttng_uri *uris;
3147
3148 nb_uri = cmd_ctx->lsm->u.uri.size;
3149 len = nb_uri * sizeof(struct lttng_uri);
3150
3151 if (nb_uri == 0) {
3152 ret = LTTNG_ERR_INVALID;
3153 goto error;
3154 }
3155
3156 uris = zmalloc(len);
3157 if (uris == NULL) {
3158 ret = LTTNG_ERR_FATAL;
3159 goto error;
3160 }
3161
3162 /* Receive variable len data */
3163 DBG("Receiving %zu URI(s) from client ...", nb_uri);
3164 ret = lttcomm_recv_unix_sock(sock, uris, len);
3165 if (ret <= 0) {
3166 DBG("No URIs received from client... continuing");
3167 *sock_error = 1;
3168 ret = LTTNG_ERR_SESSION_FAIL;
3169 free(uris);
3170 goto error;
3171 }
3172
3173 ret = cmd_set_consumer_uri(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3174 nb_uri, uris);
3175 if (ret != LTTNG_OK) {
3176 free(uris);
3177 goto error;
3178 }
3179
3180 /*
3181 * XXX: 0 means that this URI should be applied on the session. Should
3182 * be a DOMAIN enuam.
3183 */
3184 if (cmd_ctx->lsm->domain.type == 0) {
3185 /* Add the URI for the UST session if a consumer is present. */
3186 if (cmd_ctx->session->ust_session &&
3187 cmd_ctx->session->ust_session->consumer) {
3188 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_UST, cmd_ctx->session,
3189 nb_uri, uris);
3190 } else if (cmd_ctx->session->kernel_session &&
3191 cmd_ctx->session->kernel_session->consumer) {
3192 ret = cmd_set_consumer_uri(LTTNG_DOMAIN_KERNEL,
3193 cmd_ctx->session, nb_uri, uris);
3194 }
3195 }
3196
3197 free(uris);
3198
3199 break;
3200 }
3201 case LTTNG_START_TRACE:
3202 {
3203 ret = cmd_start_trace(cmd_ctx->session);
3204 break;
3205 }
3206 case LTTNG_STOP_TRACE:
3207 {
3208 ret = cmd_stop_trace(cmd_ctx->session);
3209 break;
3210 }
3211 case LTTNG_CREATE_SESSION:
3212 {
3213 size_t nb_uri, len;
3214 struct lttng_uri *uris = NULL;
3215
3216 nb_uri = cmd_ctx->lsm->u.uri.size;
3217 len = nb_uri * sizeof(struct lttng_uri);
3218
3219 if (nb_uri > 0) {
3220 uris = zmalloc(len);
3221 if (uris == NULL) {
3222 ret = LTTNG_ERR_FATAL;
3223 goto error;
3224 }
3225
3226 /* Receive variable len data */
3227 DBG("Waiting for %zu URIs from client ...", nb_uri);
3228 ret = lttcomm_recv_unix_sock(sock, uris, len);
3229 if (ret <= 0) {
3230 DBG("No URIs received from client... continuing");
3231 *sock_error = 1;
3232 ret = LTTNG_ERR_SESSION_FAIL;
3233 free(uris);
3234 goto error;
3235 }
3236
3237 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3238 DBG("Creating session with ONE network URI is a bad call");
3239 ret = LTTNG_ERR_SESSION_FAIL;
3240 free(uris);
3241 goto error;
3242 }
3243 }
3244
3245 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri,
3246 &cmd_ctx->creds, 0);
3247
3248 free(uris);
3249
3250 break;
3251 }
3252 case LTTNG_DESTROY_SESSION:
3253 {
3254 ret = cmd_destroy_session(cmd_ctx->session, kernel_poll_pipe[1]);
3255
3256 /* Set session to NULL so we do not unlock it after free. */
3257 cmd_ctx->session = NULL;
3258 break;
3259 }
3260 case LTTNG_LIST_DOMAINS:
3261 {
3262 ssize_t nb_dom;
3263 struct lttng_domain *domains;
3264
3265 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3266 if (nb_dom < 0) {
3267 /* Return value is a negative lttng_error_code. */
3268 ret = -nb_dom;
3269 goto error;
3270 }
3271
3272 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3273 if (ret < 0) {
3274 free(domains);
3275 goto setup_error;
3276 }
3277
3278 /* Copy event list into message payload */
3279 memcpy(cmd_ctx->llm->payload, domains,
3280 nb_dom * sizeof(struct lttng_domain));
3281
3282 free(domains);
3283
3284 ret = LTTNG_OK;
3285 break;
3286 }
3287 case LTTNG_LIST_CHANNELS:
3288 {
3289 int nb_chan;
3290 struct lttng_channel *channels;
3291
3292 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3293 cmd_ctx->session, &channels);
3294 if (nb_chan < 0) {
3295 /* Return value is a negative lttng_error_code. */
3296 ret = -nb_chan;
3297 goto error;
3298 }
3299
3300 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3301 if (ret < 0) {
3302 free(channels);
3303 goto setup_error;
3304 }
3305
3306 /* Copy event list into message payload */
3307 memcpy(cmd_ctx->llm->payload, channels,
3308 nb_chan * sizeof(struct lttng_channel));
3309
3310 free(channels);
3311
3312 ret = LTTNG_OK;
3313 break;
3314 }
3315 case LTTNG_LIST_EVENTS:
3316 {
3317 ssize_t nb_event;
3318 struct lttng_event *events = NULL;
3319
3320 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3321 cmd_ctx->lsm->u.list.channel_name, &events);
3322 if (nb_event < 0) {
3323 /* Return value is a negative lttng_error_code. */
3324 ret = -nb_event;
3325 goto error;
3326 }
3327
3328 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3329 if (ret < 0) {
3330 free(events);
3331 goto setup_error;
3332 }
3333
3334 /* Copy event list into message payload */
3335 memcpy(cmd_ctx->llm->payload, events,
3336 nb_event * sizeof(struct lttng_event));
3337
3338 free(events);
3339
3340 ret = LTTNG_OK;
3341 break;
3342 }
3343 case LTTNG_LIST_SESSIONS:
3344 {
3345 unsigned int nr_sessions;
3346
3347 session_lock_list();
3348 nr_sessions = lttng_sessions_count(
3349 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3350 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3351
3352 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3353 if (ret < 0) {
3354 session_unlock_list();
3355 goto setup_error;
3356 }
3357
3358 /* Filled the session array */
3359 cmd_list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3360 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3361 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3362
3363 session_unlock_list();
3364
3365 ret = LTTNG_OK;
3366 break;
3367 }
3368 case LTTNG_CALIBRATE:
3369 {
3370 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3371 &cmd_ctx->lsm->u.calibrate);
3372 break;
3373 }
3374 case LTTNG_REGISTER_CONSUMER:
3375 {
3376 struct consumer_data *cdata;
3377
3378 switch (cmd_ctx->lsm->domain.type) {
3379 case LTTNG_DOMAIN_KERNEL:
3380 cdata = &kconsumer_data;
3381 break;
3382 default:
3383 ret = LTTNG_ERR_UND;
3384 goto error;
3385 }
3386
3387 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3388 cmd_ctx->lsm->u.reg.path, cdata);
3389 break;
3390 }
3391 case LTTNG_DATA_PENDING:
3392 {
3393 ret = cmd_data_pending(cmd_ctx->session);
3394 break;
3395 }
3396 case LTTNG_SNAPSHOT_ADD_OUTPUT:
3397 {
3398 struct lttcomm_lttng_output_id reply;
3399
3400 ret = cmd_snapshot_add_output(cmd_ctx->session,
3401 &cmd_ctx->lsm->u.snapshot_output.output, &reply.id);
3402 if (ret != LTTNG_OK) {
3403 goto error;
3404 }
3405
3406 ret = setup_lttng_msg(cmd_ctx, sizeof(reply));
3407 if (ret < 0) {
3408 goto setup_error;
3409 }
3410
3411 /* Copy output list into message payload */
3412 memcpy(cmd_ctx->llm->payload, &reply, sizeof(reply));
3413 ret = LTTNG_OK;
3414 break;
3415 }
3416 case LTTNG_SNAPSHOT_DEL_OUTPUT:
3417 {
3418 ret = cmd_snapshot_del_output(cmd_ctx->session,
3419 &cmd_ctx->lsm->u.snapshot_output.output);
3420 break;
3421 }
3422 case LTTNG_SNAPSHOT_LIST_OUTPUT:
3423 {
3424 ssize_t nb_output;
3425 struct lttng_snapshot_output *outputs = NULL;
3426
3427 nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs);
3428 if (nb_output < 0) {
3429 ret = -nb_output;
3430 goto error;
3431 }
3432
3433 ret = setup_lttng_msg(cmd_ctx,
3434 nb_output * sizeof(struct lttng_snapshot_output));
3435 if (ret < 0) {
3436 free(outputs);
3437 goto setup_error;
3438 }
3439
3440 if (outputs) {
3441 /* Copy output list into message payload */
3442 memcpy(cmd_ctx->llm->payload, outputs,
3443 nb_output * sizeof(struct lttng_snapshot_output));
3444 free(outputs);
3445 }
3446
3447 ret = LTTNG_OK;
3448 break;
3449 }
3450 case LTTNG_SNAPSHOT_RECORD:
3451 {
3452 ret = cmd_snapshot_record(cmd_ctx->session,
3453 &cmd_ctx->lsm->u.snapshot_record.output,
3454 cmd_ctx->lsm->u.snapshot_record.wait);
3455 break;
3456 }
3457 case LTTNG_CREATE_SESSION_SNAPSHOT:
3458 {
3459 size_t nb_uri, len;
3460 struct lttng_uri *uris = NULL;
3461
3462 nb_uri = cmd_ctx->lsm->u.uri.size;
3463 len = nb_uri * sizeof(struct lttng_uri);
3464
3465 if (nb_uri > 0) {
3466 uris = zmalloc(len);
3467 if (uris == NULL) {
3468 ret = LTTNG_ERR_FATAL;
3469 goto error;
3470 }
3471
3472 /* Receive variable len data */
3473 DBG("Waiting for %zu URIs from client ...", nb_uri);
3474 ret = lttcomm_recv_unix_sock(sock, uris, len);
3475 if (ret <= 0) {
3476 DBG("No URIs received from client... continuing");
3477 *sock_error = 1;
3478 ret = LTTNG_ERR_SESSION_FAIL;
3479 free(uris);
3480 goto error;
3481 }
3482
3483 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3484 DBG("Creating session with ONE network URI is a bad call");
3485 ret = LTTNG_ERR_SESSION_FAIL;
3486 free(uris);
3487 goto error;
3488 }
3489 }
3490
3491 ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris,
3492 nb_uri, &cmd_ctx->creds);
3493 free(uris);
3494 break;
3495 }
3496 case LTTNG_CREATE_SESSION_LIVE:
3497 {
3498 size_t nb_uri, len;
3499 struct lttng_uri *uris = NULL;
3500
3501 nb_uri = cmd_ctx->lsm->u.uri.size;
3502 len = nb_uri * sizeof(struct lttng_uri);
3503
3504 if (nb_uri > 0) {
3505 uris = zmalloc(len);
3506 if (uris == NULL) {
3507 ret = LTTNG_ERR_FATAL;
3508 goto error;
3509 }
3510
3511 /* Receive variable len data */
3512 DBG("Waiting for %zu URIs from client ...", nb_uri);
3513 ret = lttcomm_recv_unix_sock(sock, uris, len);
3514 if (ret <= 0) {
3515 DBG("No URIs received from client... continuing");
3516 *sock_error = 1;
3517 ret = LTTNG_ERR_SESSION_FAIL;
3518 free(uris);
3519 goto error;
3520 }
3521
3522 if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) {
3523 DBG("Creating session with ONE network URI is a bad call");
3524 ret = LTTNG_ERR_SESSION_FAIL;
3525 free(uris);
3526 goto error;
3527 }
3528 }
3529
3530 ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris,
3531 nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval);
3532 free(uris);
3533 break;
3534 }
3535 default:
3536 ret = LTTNG_ERR_UND;
3537 break;
3538 }
3539
3540 error:
3541 if (cmd_ctx->llm == NULL) {
3542 DBG("Missing llm structure. Allocating one.");
3543 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3544 goto setup_error;
3545 }
3546 }
3547 /* Set return code */
3548 cmd_ctx->llm->ret_code = ret;
3549 setup_error:
3550 if (cmd_ctx->session) {
3551 session_unlock(cmd_ctx->session);
3552 }
3553 if (need_tracing_session) {
3554 session_unlock_list();
3555 }
3556 init_setup_error:
3557 return ret;
3558 }
3559
3560 /*
3561 * Thread managing health check socket.
3562 */
3563 static void *thread_manage_health(void *data)
3564 {
3565 int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
3566 uint32_t revents, nb_fd;
3567 struct lttng_poll_event events;
3568 struct health_comm_msg msg;
3569 struct health_comm_reply reply;
3570
3571 DBG("[thread] Manage health check started");
3572
3573 rcu_register_thread();
3574
3575 /* We might hit an error path before this is created. */
3576 lttng_poll_init(&events);
3577
3578 /* Create unix socket */
3579 sock = lttcomm_create_unix_sock(health_unix_sock_path);
3580 if (sock < 0) {
3581 ERR("Unable to create health check Unix socket");
3582 ret = -1;
3583 goto error;
3584 }
3585
3586 if (is_root) {
3587 /* lttng health client socket path permissions */
3588 ret = chown(health_unix_sock_path, 0,
3589 utils_get_group_id(tracing_group_name));
3590 if (ret < 0) {
3591 ERR("Unable to set group on %s", health_unix_sock_path);
3592 PERROR("chown");
3593 ret = -1;
3594 goto error;
3595 }
3596
3597 ret = chmod(health_unix_sock_path,
3598 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3599 if (ret < 0) {
3600 ERR("Unable to set permissions on %s", health_unix_sock_path);
3601 PERROR("chmod");
3602 ret = -1;
3603 goto error;
3604 }
3605 }
3606
3607 /*
3608 * Set the CLOEXEC flag. Return code is useless because either way, the
3609 * show must go on.
3610 */
3611 (void) utils_set_fd_cloexec(sock);
3612
3613 ret = lttcomm_listen_unix_sock(sock);
3614 if (ret < 0) {
3615 goto error;
3616 }
3617
3618 /*
3619 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3620 * more will be added to this poll set.
3621 */
3622 ret = sessiond_set_thread_pollset(&events, 2);
3623 if (ret < 0) {
3624 goto error;
3625 }
3626
3627 /* Add the application registration socket */
3628 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
3629 if (ret < 0) {
3630 goto error;
3631 }
3632
3633 while (1) {
3634 DBG("Health check ready");
3635
3636 /* Inifinite blocking call, waiting for transmission */
3637 restart:
3638 ret = lttng_poll_wait(&events, -1);
3639 if (ret < 0) {
3640 /*
3641 * Restart interrupted system call.
3642 */
3643 if (errno == EINTR) {
3644 goto restart;
3645 }
3646 goto error;
3647 }
3648
3649 nb_fd = ret;
3650
3651 for (i = 0; i < nb_fd; i++) {
3652 /* Fetch once the poll data */
3653 revents = LTTNG_POLL_GETEV(&events, i);
3654 pollfd = LTTNG_POLL_GETFD(&events, i);
3655
3656 /* Thread quit pipe has been closed. Killing thread. */
3657 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3658 if (ret) {
3659 err = 0;
3660 goto exit;
3661 }
3662
3663 /* Event on the registration socket */
3664 if (pollfd == sock) {
3665 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3666 ERR("Health socket poll error");
3667 goto error;
3668 }
3669 }
3670 }
3671
3672 new_sock = lttcomm_accept_unix_sock(sock);
3673 if (new_sock < 0) {
3674 goto error;
3675 }
3676
3677 /*
3678 * Set the CLOEXEC flag. Return code is useless because either way, the
3679 * show must go on.
3680 */
3681 (void) utils_set_fd_cloexec(new_sock);
3682
3683 DBG("Receiving data from client for health...");
3684 ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
3685 if (ret <= 0) {
3686 DBG("Nothing recv() from client... continuing");
3687 ret = close(new_sock);
3688 if (ret) {
3689 PERROR("close");
3690 }
3691 new_sock = -1;
3692 continue;
3693 }
3694
3695 rcu_thread_online();
3696
3697 reply.ret_code = 0;
3698 for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) {
3699 /*
3700 * health_check_state returns 0 if health is
3701 * bad.
3702 */
3703 if (!health_check_state(health_sessiond, i)) {
3704 reply.ret_code |= 1ULL << i;
3705 }
3706 }
3707
3708 DBG2("Health check return value %" PRIx64, reply.ret_code);
3709
3710 ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
3711 if (ret < 0) {
3712 ERR("Failed to send health data back to client");
3713 }
3714
3715 /* End of transmission */
3716 ret = close(new_sock);
3717 if (ret) {
3718 PERROR("close");
3719 }
3720 new_sock = -1;
3721 }
3722
3723 exit:
3724 error:
3725 if (err) {
3726 ERR("Health error occurred in %s", __func__);
3727 }
3728 DBG("Health check thread dying");
3729 unlink(health_unix_sock_path);
3730 if (sock >= 0) {
3731 ret = close(sock);
3732 if (ret) {
3733 PERROR("close");
3734 }
3735 }
3736
3737 lttng_poll_clean(&events);
3738
3739 rcu_unregister_thread();
3740 return NULL;
3741 }
3742
3743 /*
3744 * This thread manage all clients request using the unix client socket for
3745 * communication.
3746 */
3747 static void *thread_manage_clients(void *data)
3748 {
3749 int sock = -1, ret, i, pollfd, err = -1;
3750 int sock_error;
3751 uint32_t revents, nb_fd;
3752 struct command_ctx *cmd_ctx = NULL;
3753 struct lttng_poll_event events;
3754
3755 DBG("[thread] Manage client started");
3756
3757 rcu_register_thread();
3758
3759 health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD);
3760
3761 health_code_update();
3762
3763 ret = lttcomm_listen_unix_sock(client_sock);
3764 if (ret < 0) {
3765 goto error_listen;
3766 }
3767
3768 /*
3769 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3770 * more will be added to this poll set.
3771 */
3772 ret = sessiond_set_thread_pollset(&events, 2);
3773 if (ret < 0) {
3774 goto error_create_poll;
3775 }
3776
3777 /* Add the application registration socket */
3778 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3779 if (ret < 0) {
3780 goto error;
3781 }
3782
3783 /*
3784 * Notify parent pid that we are ready to accept command for client side.
3785 * This ppid is the one from the external process that spawned us.
3786 */
3787 if (opt_sig_parent) {
3788 kill(ppid, SIGUSR1);
3789 }
3790
3791 /* Notify the parent of the fork() process that we are ready. */
3792 if (opt_daemon) {
3793 kill(child_ppid, SIGUSR1);
3794 }
3795
3796 /* This testpoint is after we signal readiness to the parent. */
3797 if (testpoint(sessiond_thread_manage_clients)) {
3798 goto error;
3799 }
3800
3801 if (testpoint(sessiond_thread_manage_clients_before_loop)) {
3802 goto error;
3803 }
3804
3805 health_code_update();
3806
3807 while (1) {
3808 DBG("Accepting client command ...");
3809
3810 /* Inifinite blocking call, waiting for transmission */
3811 restart:
3812 health_poll_entry();
3813 ret = lttng_poll_wait(&events, -1);
3814 health_poll_exit();
3815 if (ret < 0) {
3816 /*
3817 * Restart interrupted system call.
3818 */
3819 if (errno == EINTR) {
3820 goto restart;
3821 }
3822 goto error;
3823 }
3824
3825 nb_fd = ret;
3826
3827 for (i = 0; i < nb_fd; i++) {
3828 /* Fetch once the poll data */
3829 revents = LTTNG_POLL_GETEV(&events, i);
3830 pollfd = LTTNG_POLL_GETFD(&events, i);
3831
3832 health_code_update();
3833
3834 /* Thread quit pipe has been closed. Killing thread. */
3835 ret = sessiond_check_thread_quit_pipe(pollfd, revents);
3836 if (ret) {
3837 err = 0;
3838 goto exit;
3839 }
3840
3841 /* Event on the registration socket */
3842 if (pollfd == client_sock) {
3843 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3844 ERR("Client socket poll error");
3845 goto error;
3846 }
3847 }
3848 }
3849
3850 DBG("Wait for client response");
3851
3852 health_code_update();
3853
3854 sock = lttcomm_accept_unix_sock(client_sock);
3855 if (sock < 0) {
3856 goto error;
3857 }
3858
3859 /*
3860 * Set the CLOEXEC flag. Return code is useless because either way, the
3861 * show must go on.
3862 */
3863 (void) utils_set_fd_cloexec(sock);
3864
3865 /* Set socket option for credentials retrieval */
3866 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3867 if (ret < 0) {
3868 goto error;
3869 }
3870
3871 /* Allocate context command to process the client request */
3872 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3873 if (cmd_ctx == NULL) {
3874 PERROR("zmalloc cmd_ctx");
3875 goto error;
3876 }
3877
3878 /* Allocate data buffer for reception */
3879 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3880 if (cmd_ctx->lsm == NULL) {
3881 PERROR("zmalloc cmd_ctx->lsm");
3882 goto error;
3883 }
3884
3885 cmd_ctx->llm = NULL;
3886 cmd_ctx->session = NULL;
3887
3888 health_code_update();
3889
3890 /*
3891 * Data is received from the lttng client. The struct
3892 * lttcomm_session_msg (lsm) contains the command and data request of
3893 * the client.
3894 */
3895 DBG("Receiving data from client ...");
3896 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3897 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3898 if (ret <= 0) {
3899 DBG("Nothing recv() from client... continuing");
3900 ret = close(sock);
3901 if (ret) {
3902 PERROR("close");
3903 }
3904 sock = -1;
3905 clean_command_ctx(&cmd_ctx);
3906 continue;
3907 }
3908
3909 health_code_update();
3910
3911 // TODO: Validate cmd_ctx including sanity check for
3912 // security purpose.
3913
3914 rcu_thread_online();
3915 /*
3916 * This function dispatch the work to the kernel or userspace tracer
3917 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3918 * informations for the client. The command context struct contains
3919 * everything this function may needs.
3920 */
3921 ret = process_client_msg(cmd_ctx, sock, &sock_error);
3922 rcu_thread_offline();
3923 if (ret < 0) {
3924 ret = close(sock);
3925 if (ret) {
3926 PERROR("close");
3927 }
3928 sock = -1;
3929 /*
3930 * TODO: Inform client somehow of the fatal error. At
3931 * this point, ret < 0 means that a zmalloc failed
3932 * (ENOMEM). Error detected but still accept
3933 * command, unless a socket error has been
3934 * detected.
3935 */
3936 clean_command_ctx(&cmd_ctx);
3937 continue;
3938 }
3939
3940 health_code_update();
3941
3942 DBG("Sending response (size: %d, retcode: %s)",
3943 cmd_ctx->lttng_msg_size,
3944 lttng_strerror(-cmd_ctx->llm->ret_code));
3945 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3946 if (ret < 0) {
3947 ERR("Failed to send data back to client");
3948 }
3949
3950 /* End of transmission */
3951 ret = close(sock);
3952 if (ret) {
3953 PERROR("close");
3954 }
3955 sock = -1;
3956
3957 clean_command_ctx(&cmd_ctx);
3958
3959 health_code_update();
3960 }
3961
3962 exit:
3963 error:
3964 if (sock >= 0) {
3965 ret = close(sock);
3966 if (ret) {
3967 PERROR("close");
3968 }
3969 }
3970
3971 lttng_poll_clean(&events);
3972 clean_command_ctx(&cmd_ctx);
3973
3974 error_listen:
3975 error_create_poll:
3976 unlink(client_unix_sock_path);
3977 if (client_sock >= 0) {
3978 ret = close(client_sock);
3979 if (ret) {
3980 PERROR("close");
3981 }
3982 }
3983
3984 if (err) {
3985 health_error();
3986 ERR("Health error occurred in %s", __func__);
3987 }
3988
3989 health_unregister(health_sessiond);
3990
3991 DBG("Client thread dying");
3992
3993 rcu_unregister_thread();
3994 return NULL;
3995 }
3996
3997
3998 /*
3999 * usage function on stderr
4000 */
4001 static void usage(void)
4002 {
4003 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
4004 fprintf(stderr, " -h, --help Display this usage.\n");
4005 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
4006 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
4007 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
4008 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
4009 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
4010 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
4011 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
4012 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
4013 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
4014 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
4015 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
4016 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
4017 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
4018 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
4019 fprintf(stderr, " -V, --version Show version number.\n");
4020 fprintf(stderr, " -S, --sig-parent Send SIGUSR1 to parent pid to notify readiness.\n");
4021 fprintf(stderr, " -q, --quiet No output at all.\n");
4022 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
4023 fprintf(stderr, " -p, --pidfile FILE Write a pid to FILE name overriding the default value.\n");
4024 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
4025 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
4026 fprintf(stderr, " --jul-tcp-port JUL application registration TCP port\n");
4027 fprintf(stderr, " -f --config Load daemon configuration file\n");
4028 }
4029
4030 /*
4031 * Take an option from the getopt output and set it in the right variable to be
4032 * used later.
4033 *
4034 * Return 0 on success else a negative value.
4035 */
4036 static int set_option(int opt, const char *arg, const char *optname)
4037 {
4038 int ret = 0;
4039
4040 switch (opt) {
4041 case 0:
4042 fprintf(stderr, "option %s", optname);
4043 if (arg) {
4044 fprintf(stderr, " with arg %s\n", arg);
4045 }
4046 break;
4047 case 'c':
4048 snprintf(client_unix_sock_path, PATH_MAX, "%s", arg);
4049 break;
4050 case 'a':
4051 snprintf(apps_unix_sock_path, PATH_MAX, "%s", arg);
4052 break;
4053 case 'd':
4054 opt_daemon = 1;
4055 break;
4056 case 'g':
4057 tracing_group_name = strdup(arg);
4058 break;
4059 case 'h':
4060 usage();
4061 exit(EXIT_FAILURE);
4062 case 'V':
4063 fprintf(stdout, "%s\n", VERSION);
4064 exit(EXIT_SUCCESS);
4065 case 'S':
4066 opt_sig_parent = 1;
4067 break;
4068 case 'E':
4069 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4070 break;
4071 case 'C':
4072 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4073 break;
4074 case 'F':
4075 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4076 break;
4077 case 'D':
4078 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4079 break;
4080 case 'H':
4081 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", arg);
4082 break;
4083 case 'G':
4084 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", arg);
4085 break;
4086 case 'N':
4087 opt_no_kernel = 1;
4088 break;
4089 case 'q':
4090 lttng_opt_quiet = 1;
4091 break;
4092 case 'v':
4093 /* Verbose level can increase using multiple -v */
4094 if (arg) {
4095 lttng_opt_verbose = config_parse_value(arg);
4096 } else {
4097 lttng_opt_verbose += 1;
4098 }
4099 break;
4100 case 'Z':
4101 if (arg) {
4102 opt_verbose_consumer = config_parse_value(arg);
4103 } else {
4104 opt_verbose_consumer += 1;
4105 }
4106 break;
4107 case 'u':
4108 consumerd32_bin = strdup(arg);
4109 consumerd32_bin_override = 1;
4110 break;
4111 case 'U':
4112 consumerd32_libdir = strdup(arg);
4113 consumerd32_libdir_override = 1;
4114 break;
4115 case 't':
4116 consumerd64_bin = strdup(arg);
4117 consumerd64_bin_override = 1;
4118 break;
4119 case 'T':
4120 consumerd64_libdir = strdup(arg);
4121 consumerd64_libdir_override = 1;
4122 break;
4123 case 'p':
4124 opt_pidfile = strdup(arg);
4125 break;
4126 case 'J': /* JUL TCP port. */
4127 {
4128 unsigned long v;
4129
4130 errno = 0;
4131 v = strtoul(arg, NULL, 0);
4132 if (errno != 0 || !isdigit(arg[0])) {
4133 ERR("Wrong value in --jul-tcp-port parameter: %s", arg);
4134 return -1;
4135 }
4136 if (v == 0 || v >= 65535) {
4137 ERR("Port overflow in --jul-tcp-port parameter: %s", arg);
4138 return -1;
4139 }
4140 jul_tcp_port = (uint32_t) v;
4141 DBG3("JUL TCP port set to non default: %u", jul_tcp_port);
4142 break;
4143 }
4144 default:
4145 /* Unknown option or other error.
4146 * Error is printed by getopt, just return */
4147 ret = -1;
4148 }
4149
4150 return ret;
4151 }
4152
4153 /*
4154 * config_entry_handler_cb used to handle options read from a config file.
4155 * See config_entry_handler_cb comment in common/config/config.h for the
4156 * return value conventions.
4157 */
4158 static int config_entry_handler(const struct config_entry *entry, void *unused)
4159 {
4160 int ret = 0, i;
4161
4162 if (!entry || !entry->name || !entry->value) {
4163 ret = -EINVAL;
4164 goto end;
4165 }
4166
4167 /* Check if the option is to be ignored */
4168 for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
4169 if (!strcmp(entry->name, config_ignore_options[i])) {
4170 goto end;
4171 }
4172 }
4173
4174 for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1;
4175 i++) {
4176
4177 /* Ignore if not fully matched. */
4178 if (strcmp(entry->name, long_options[i].name)) {
4179 continue;
4180 }
4181
4182 /*
4183 * If the option takes no argument on the command line, we have to
4184 * check if the value is "true". We support non-zero numeric values,
4185 * true, on and yes.
4186 */
4187 if (!long_options[i].has_arg) {
4188 ret = config_parse_value(entry->value);
4189 if (ret <= 0) {
4190 if (ret) {
4191 WARN("Invalid configuration value \"%s\" for option %s",
4192 entry->value, entry->name);
4193 }
4194 /* False, skip boolean config option. */
4195 goto end;
4196 }
4197 }
4198
4199 ret = set_option(long_options[i].val, entry->value, entry->name);
4200 goto end;
4201 }
4202
4203 WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
4204
4205 end:
4206 return ret;
4207 }
4208
4209 /*
4210 * daemon configuration loading and argument parsing
4211 */
4212 static int set_options(int argc, char **argv)
4213 {
4214 int ret = 0, c = 0, option_index = 0;
4215 int orig_optopt = optopt, orig_optind = optind;
4216 char *optstring;
4217 const char *config_path = NULL;
4218
4219 optstring = utils_generate_optstring(long_options,
4220 sizeof(long_options) / sizeof(struct option));
4221 if (!optstring) {
4222 ret = -ENOMEM;
4223 goto end;
4224 }
4225
4226 /* Check for the --config option */
4227 while ((c = getopt_long(argc, argv, optstring, long_options,
4228 &option_index)) != -1) {
4229 if (c == '?') {
4230 ret = -EINVAL;
4231 goto end;
4232 } else if (c != 'f') {
4233 /* if not equal to --config option. */
4234 continue;
4235 }
4236
4237 config_path = utils_expand_path(optarg);
4238 if (!config_path) {
4239 ERR("Failed to resolve path: %s", optarg);
4240 }
4241 }
4242
4243 ret = config_get_section_entries(config_path, config_section_name,
4244 config_entry_handler, NULL);
4245 if (ret) {
4246 if (ret > 0) {
4247 ERR("Invalid configuration option at line %i", ret);
4248 ret = -1;
4249 }
4250 goto end;
4251 }
4252
4253 /* Reset getopt's global state */
4254 optopt = orig_optopt;
4255 optind = orig_optind;
4256 while (1) {
4257 c = getopt_long(argc, argv, optstring, long_options, &option_index);
4258 if (c == -1) {
4259 break;
4260 }
4261
4262 ret = set_option(c, optarg, long_options[option_index].name);
4263 if (ret < 0) {
4264 break;
4265 }
4266 }
4267
4268 end:
4269 free(optstring);
4270 return ret;
4271 }
4272
4273 /*
4274 * Creates the two needed socket by the daemon.
4275 * apps_sock - The communication socket for all UST apps.
4276 * client_sock - The communication of the cli tool (lttng).
4277 */
4278 static int init_daemon_socket(void)
4279 {
4280 int ret = 0;
4281 mode_t old_umask;
4282
4283 old_umask = umask(0);
4284
4285 /* Create client tool unix socket */
4286 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4287 if (client_sock < 0) {
4288 ERR("Create unix sock failed: %s", client_unix_sock_path);
4289 ret = -1;
4290 goto end;
4291 }
4292
4293 /* Set the cloexec flag */
4294 ret = utils_set_fd_cloexec(client_sock);
4295 if (ret < 0) {
4296 ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). "
4297 "Continuing but note that the consumer daemon will have a "
4298 "reference to this socket on exec()", client_sock);
4299 }
4300
4301 /* File permission MUST be 660 */
4302 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4303 if (ret < 0) {
4304 ERR("Set file permissions failed: %s", client_unix_sock_path);
4305 PERROR("chmod");
4306 goto end;
4307 }
4308
4309 /* Create the application unix socket */
4310 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4311 if (apps_sock < 0) {
4312 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4313 ret = -1;
4314 goto end;
4315 }
4316
4317 /* Set the cloexec flag */
4318 ret = utils_set_fd_cloexec(apps_sock);
4319 if (ret < 0) {
4320 ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). "
4321 "Continuing but note that the consumer daemon will have a "
4322 "reference to this socket on exec()", apps_sock);
4323 }
4324
4325 /* File permission MUST be 666 */
4326 ret = chmod(apps_unix_sock_path,
4327 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4328 if (ret < 0) {
4329 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4330 PERROR("chmod");
4331 goto end;
4332 }
4333
4334 DBG3("Session daemon client socket %d and application socket %d created",
4335 client_sock, apps_sock);
4336
4337 end:
4338 umask(old_umask);
4339 return ret;
4340 }
4341
4342 /*
4343 * Check if the global socket is available, and if a daemon is answering at the
4344 * other side. If yes, error is returned.
4345 */
4346 static int check_existing_daemon(void)
4347 {
4348 /* Is there anybody out there ? */
4349 if (lttng_session_daemon_alive()) {
4350 return -EEXIST;
4351 }
4352
4353 return 0;
4354 }
4355
4356 /*
4357 * Set the tracing group gid onto the client socket.
4358 *
4359 * Race window between mkdir and chown is OK because we are going from more
4360 * permissive (root.root) to less permissive (root.tracing).
4361 */
4362 static int set_permissions(char *rundir)
4363 {
4364 int ret;
4365 gid_t gid;
4366
4367 gid = utils_get_group_id(tracing_group_name);
4368
4369 /* Set lttng run dir */
4370 ret = chown(rundir, 0, gid);
4371 if (ret < 0) {
4372 ERR("Unable to set group on %s", rundir);
4373 PERROR("chown");
4374 }
4375
4376 /*
4377 * Ensure all applications and tracing group can search the run
4378 * dir. Allow everyone to read the directory, since it does not
4379 * buy us anything to hide its content.
4380 */
4381 ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
4382 if (ret < 0) {
4383 ERR("Unable to set permissions on %s", rundir);
4384 PERROR("chmod");
4385 }
4386
4387 /* lttng client socket path */
4388 ret = chown(client_unix_sock_path, 0, gid);
4389 if (ret < 0) {
4390 ERR("Unable to set group on %s", client_unix_sock_path);
4391 PERROR("chown");
4392 }
4393
4394 /* kconsumer error socket path */
4395 ret = chown(kconsumer_data.err_unix_sock_path, 0, 0);
4396 if (ret < 0) {
4397 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4398 PERROR("chown");
4399 }
4400
4401 /* 64-bit ustconsumer error socket path */
4402 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0);
4403 if (ret < 0) {
4404 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4405 PERROR("chown");
4406 }
4407
4408 /* 32-bit ustconsumer compat32 error socket path */
4409 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0);
4410 if (ret < 0) {
4411 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4412 PERROR("chown");
4413 }
4414
4415 DBG("All permissions are set");
4416
4417 return ret;
4418 }
4419
4420 /*
4421 * Create the lttng run directory needed for all global sockets and pipe.
4422 */
4423 static int create_lttng_rundir(const char *rundir)
4424 {
4425 int ret;
4426
4427 DBG3("Creating LTTng run directory: %s", rundir);
4428
4429 ret = mkdir(rundir, S_IRWXU);
4430 if (ret < 0) {
4431 if (errno != EEXIST) {
4432 ERR("Unable to create %s", rundir);
4433 goto error;
4434 } else {
4435 ret = 0;
4436 }
4437 }
4438
4439 error:
4440 return ret;
4441 }
4442
4443 /*
4444 * Setup sockets and directory needed by the kconsumerd communication with the
4445 * session daemon.
4446 */
4447 static int set_consumer_sockets(struct consumer_data *consumer_data,
4448 const char *rundir)
4449 {
4450 int ret;
4451 char path[PATH_MAX];
4452
4453 switch (consumer_data->type) {
4454 case LTTNG_CONSUMER_KERNEL:
4455 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4456 break;
4457 case LTTNG_CONSUMER64_UST:
4458 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4459 break;
4460 case LTTNG_CONSUMER32_UST:
4461 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4462 break;
4463 default:
4464 ERR("Consumer type unknown");
4465 ret = -EINVAL;
4466 goto error;
4467 }
4468
4469 DBG2("Creating consumer directory: %s", path);
4470
4471 ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
4472 if (ret < 0) {
4473 if (errno != EEXIST) {
4474 PERROR("mkdir");
4475 ERR("Failed to create %s", path);
4476 goto error;
4477 }
4478 ret = -1;
4479 }
4480 if (is_root) {
4481 ret = chown(path, 0, utils_get_group_id(tracing_group_name));
4482 if (ret < 0) {
4483 ERR("Unable to set group on %s", path);
4484 PERROR("chown");
4485 goto error;
4486 }
4487 }
4488
4489 /* Create the kconsumerd error unix socket */
4490 consumer_data->err_sock =
4491 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4492 if (consumer_data->err_sock < 0) {
4493 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4494 ret = -1;
4495 goto error;
4496 }
4497
4498 /*
4499 * Set the CLOEXEC flag. Return code is useless because either way, the
4500 * show must go on.
4501 */
4502 ret = utils_set_fd_cloexec(consumer_data->err_sock);
4503 if (ret < 0) {
4504 PERROR("utils_set_fd_cloexec");
4505 /* continue anyway */
4506 }
4507
4508 /* File permission MUST be 660 */
4509 ret = chmod(consumer_data->err_unix_sock_path,
4510 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4511 if (ret < 0) {
4512 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4513 PERROR("chmod");
4514 goto error;
4515 }
4516
4517 error:
4518 return ret;
4519 }
4520
4521 /*
4522 * Signal handler for the daemon
4523 *
4524 * Simply stop all worker threads, leaving main() return gracefully after
4525 * joining all threads and calling cleanup().
4526 */
4527 static void sighandler(int sig)
4528 {
4529 switch (sig) {
4530 case SIGPIPE:
4531 DBG("SIGPIPE caught");
4532 return;
4533 case SIGINT:
4534 DBG("SIGINT caught");
4535 stop_threads();
4536 break;
4537 case SIGTERM:
4538 DBG("SIGTERM caught");
4539 stop_threads();
4540 break;
4541 case SIGUSR1:
4542 CMM_STORE_SHARED(recv_child_signal, 1);
4543 break;
4544 default:
4545 break;
4546 }
4547 }
4548
4549 /*
4550 * Setup signal handler for :
4551 * SIGINT, SIGTERM, SIGPIPE
4552 */
4553 static int set_signal_handler(void)
4554 {
4555 int ret = 0;
4556 struct sigaction sa;
4557 sigset_t sigset;
4558
4559 if ((ret = sigemptyset(&sigset)) < 0) {
4560 PERROR("sigemptyset");
4561 return ret;
4562 }
4563
4564 sa.sa_handler = sighandler;
4565 sa.sa_mask = sigset;
4566 sa.sa_flags = 0;
4567 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4568 PERROR("sigaction");
4569 return ret;
4570 }
4571
4572 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4573 PERROR("sigaction");
4574 return ret;
4575 }
4576
4577 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4578 PERROR("sigaction");
4579 return ret;
4580 }
4581
4582 if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) {
4583 PERROR("sigaction");
4584 return ret;
4585 }
4586
4587 DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT");
4588
4589 return ret;
4590 }
4591
4592 /*
4593 * Set open files limit to unlimited. This daemon can open a large number of
4594 * file descriptors in order to consumer multiple kernel traces.
4595 */
4596 static void set_ulimit(void)
4597 {
4598 int ret;
4599 struct rlimit lim;
4600
4601 /* The kernel does not allowed an infinite limit for open files */
4602 lim.rlim_cur = 65535;
4603 lim.rlim_max = 65535;
4604
4605 ret = setrlimit(RLIMIT_NOFILE, &lim);
4606 if (ret < 0) {
4607 PERROR("failed to set open files limit");
4608 }
4609 }
4610
4611 /*
4612 * Write pidfile using the rundir and opt_pidfile.
4613 */
4614 static void write_pidfile(void)
4615 {
4616 int ret;
4617 char pidfile_path[PATH_MAX];
4618
4619 assert(rundir);
4620
4621 if (opt_pidfile) {
4622 strncpy(pidfile_path, opt_pidfile, sizeof(pidfile_path));
4623 } else {
4624 /* Build pidfile path from rundir and opt_pidfile. */
4625 ret = snprintf(pidfile_path, sizeof(pidfile_path), "%s/"
4626 DEFAULT_LTTNG_SESSIOND_PIDFILE, rundir);
4627 if (ret < 0) {
4628 PERROR("snprintf pidfile path");
4629 goto error;
4630 }
4631 }
4632
4633 /*
4634 * Create pid file in rundir. Return value is of no importance. The
4635 * execution will continue even though we are not able to write the file.
4636 */
4637 (void) utils_create_pid_file(getpid(), pidfile_path);
4638
4639 error:
4640 return;
4641 }
4642
4643 /*
4644 * Write JUL TCP port using the rundir.
4645 */
4646 static void write_julport(void)
4647 {
4648 int ret;
4649 char path[PATH_MAX];
4650
4651 assert(rundir);
4652
4653 ret = snprintf(path, sizeof(path), "%s/"
4654 DEFAULT_LTTNG_SESSIOND_JULPORT_FILE, rundir);
4655 if (ret < 0) {
4656 PERROR("snprintf julport path");
4657 goto error;
4658 }
4659
4660 /*
4661 * Create TCP JUL port file in rundir. Return value is of no importance.
4662 * The execution will continue even though we are not able to write the
4663 * file.
4664 */
4665 (void) utils_create_pid_file(jul_tcp_port, path);
4666
4667 error:
4668 return;
4669 }
4670
4671 /*
4672 * Daemonize this process by forking and making the parent wait for the child
4673 * to signal it indicating readiness. Once received, the parent successfully
4674 * quits.
4675 *
4676 * The child process undergoes the same action that daemon(3) does meaning
4677 * setsid, chdir, and dup /dev/null into 0, 1 and 2.
4678 *
4679 * Return 0 on success else -1 on error.
4680 */
4681 static int daemonize(void)
4682 {
4683 int ret;
4684 pid_t pid;
4685
4686 /* Get parent pid of this process. */
4687 child_ppid = getppid();
4688
4689 pid = fork();
4690 if (pid < 0) {
4691 PERROR("fork");
4692 goto error;
4693 } else if (pid == 0) {
4694 int fd;
4695 pid_t sid;
4696
4697 /* Child */
4698
4699 /*
4700 * Get the newly created parent pid so we can signal that process when
4701 * we are ready to operate.
4702 */
4703 child_ppid = getppid();
4704
4705 sid = setsid();
4706 if (sid < 0) {
4707 PERROR("setsid");
4708 goto error;
4709 }
4710
4711 /* Try to change directory to /. If we can't well at least notify. */
4712 ret = chdir("/");
4713 if (ret < 0) {
4714 PERROR("chdir");
4715 }
4716
4717 fd = open(_PATH_DEVNULL, O_RDWR, 0);
4718 if (fd < 0) {
4719 PERROR("open %s", _PATH_DEVNULL);
4720 /* Let 0, 1 and 2 open since we can't bind them to /dev/null. */
4721 } else {
4722 (void) dup2(fd, STDIN_FILENO);
4723 (void) dup2(fd, STDOUT_FILENO);
4724 (void) dup2(fd, STDERR_FILENO);
4725 if (fd > 2) {
4726 ret = close(fd);
4727 if (ret < 0) {
4728 PERROR("close");
4729 }
4730 }
4731 }
4732 goto end;
4733 } else {
4734 /* Parent */
4735
4736 /*
4737 * Waiting for child to notify this parent that it can exit. Note that
4738 * sleep() is interrupted before the 1 second delay as soon as the
4739 * signal is received, so it will not cause visible delay for the
4740 * user.
4741 */
4742 while (!CMM_LOAD_SHARED(recv_child_signal)) {
4743 int status;
4744 pid_t ret;
4745
4746 /*
4747 * Check if child exists without blocking. If so, we have to stop
4748 * this parent process and return an error.
4749 */
4750 ret = waitpid(pid, &status, WNOHANG);
4751 if (ret < 0 || (ret != 0 && WIFEXITED(status))) {
4752 /* The child exited somehow or was not valid. */
4753 goto error;
4754 }
4755 sleep(1);
4756 }
4757
4758 /*
4759 * From this point on, the parent can exit and the child is now an
4760 * operationnal session daemon ready to serve clients and applications.
4761 */
4762 exit(EXIT_SUCCESS);
4763 }
4764
4765 end:
4766 return 0;
4767
4768 error:
4769 return -1;
4770 }
4771
4772 /*
4773 * main
4774 */
4775 int main(int argc, char **argv)
4776 {
4777 int ret = 0;
4778 void *status;
4779 const char *home_path, *env_app_timeout;
4780
4781 init_kernel_workarounds();
4782
4783 rcu_register_thread();
4784
4785 if ((ret = set_signal_handler()) < 0) {
4786 goto error;
4787 }
4788
4789 setup_consumerd_path();
4790
4791 page_size = sysconf(_SC_PAGESIZE);
4792 if (page_size < 0) {
4793 PERROR("sysconf _SC_PAGESIZE");
4794 page_size = LONG_MAX;
4795 WARN("Fallback page size to %ld", page_size);
4796 }
4797
4798 /* Parse arguments and load the daemon configuration file */
4799 progname = argv[0];
4800 if ((ret = set_options(argc, argv)) < 0) {
4801 goto error;
4802 }
4803
4804 /* Daemonize */
4805 if (opt_daemon) {
4806 int i;
4807
4808 ret = daemonize();
4809 if (ret < 0) {
4810 goto error;
4811 }
4812
4813 /*
4814 * We are in the child. Make sure all other file descriptors are
4815 * closed, in case we are called with more opened file descriptors than
4816 * the standard ones.
4817 */
4818 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4819 (void) close(i);
4820 }
4821 }
4822
4823 /* Create thread quit pipe */
4824 if ((ret = init_thread_quit_pipe()) < 0) {
4825 goto error;
4826 }
4827
4828 /* Check if daemon is UID = 0 */
4829 is_root = !getuid();
4830
4831 if (is_root) {
4832 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4833
4834 /* Create global run dir with root access */
4835 ret = create_lttng_rundir(rundir);
4836 if (ret < 0) {
4837 goto error;
4838 }
4839
4840 if (strlen(apps_unix_sock_path) == 0) {
4841 snprintf(apps_unix_sock_path, PATH_MAX,
4842 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4843 }
4844
4845 if (strlen(client_unix_sock_path) == 0) {
4846 snprintf(client_unix_sock_path, PATH_MAX,
4847 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4848 }
4849
4850 /* Set global SHM for ust */
4851 if (strlen(wait_shm_path) == 0) {
4852 snprintf(wait_shm_path, PATH_MAX,
4853 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4854 }
4855
4856 if (strlen(health_unix_sock_path) == 0) {
4857 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4858 DEFAULT_GLOBAL_HEALTH_UNIX_SOCK);
4859 }
4860
4861 /* Setup kernel consumerd path */
4862 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4863 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4864 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4865 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4866
4867 DBG2("Kernel consumer err path: %s",
4868 kconsumer_data.err_unix_sock_path);
4869 DBG2("Kernel consumer cmd path: %s",
4870 kconsumer_data.cmd_unix_sock_path);
4871 } else {
4872 home_path = utils_get_home_dir();
4873 if (home_path == NULL) {
4874 /* TODO: Add --socket PATH option */
4875 ERR("Can't get HOME directory for sockets creation.");
4876 ret = -EPERM;
4877 goto error;
4878 }
4879
4880 /*
4881 * Create rundir from home path. This will create something like
4882 * $HOME/.lttng
4883 */
4884 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4885 if (ret < 0) {
4886 ret = -ENOMEM;
4887 goto error;
4888 }
4889
4890 ret = create_lttng_rundir(rundir);
4891 if (ret < 0) {
4892 goto error;
4893 }
4894
4895 if (strlen(apps_unix_sock_path) == 0) {
4896 snprintf(apps_unix_sock_path, PATH_MAX,
4897 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4898 }
4899
4900 /* Set the cli tool unix socket path */
4901 if (strlen(client_unix_sock_path) == 0) {
4902 snprintf(client_unix_sock_path, PATH_MAX,
4903 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4904 }
4905
4906 /* Set global SHM for ust */
4907 if (strlen(wait_shm_path) == 0) {
4908 snprintf(wait_shm_path, PATH_MAX,
4909 DEFAULT_HOME_APPS_WAIT_SHM_PATH, getuid());
4910 }
4911
4912 /* Set health check Unix path */
4913 if (strlen(health_unix_sock_path) == 0) {
4914 snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
4915 DEFAULT_HOME_HEALTH_UNIX_SOCK, home_path);
4916 }
4917 }
4918
4919 /* Set consumer initial state */
4920 kernel_consumerd_state = CONSUMER_STOPPED;
4921 ust_consumerd_state = CONSUMER_STOPPED;
4922
4923 DBG("Client socket path %s", client_unix_sock_path);
4924 DBG("Application socket path %s", apps_unix_sock_path);
4925 DBG("Application wait path %s", wait_shm_path);
4926 DBG("LTTng run directory path: %s", rundir);
4927
4928 /* 32 bits consumerd path setup */
4929 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4930 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4931 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4932 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4933
4934 DBG2("UST consumer 32 bits err path: %s",
4935 ustconsumer32_data.err_unix_sock_path);
4936 DBG2("UST consumer 32 bits cmd path: %s",
4937 ustconsumer32_data.cmd_unix_sock_path);
4938
4939 /* 64 bits consumerd path setup */
4940 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4941 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4942 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4943 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4944
4945 DBG2("UST consumer 64 bits err path: %s",
4946 ustconsumer64_data.err_unix_sock_path);
4947 DBG2("UST consumer 64 bits cmd path: %s",
4948 ustconsumer64_data.cmd_unix_sock_path);
4949
4950 /*
4951 * See if daemon already exist.
4952 */
4953 if ((ret = check_existing_daemon()) < 0) {
4954 ERR("Already running daemon.\n");
4955 /*
4956 * We do not goto exit because we must not cleanup()
4957 * because a daemon is already running.
4958 */
4959 goto error;
4960 }
4961
4962 /*
4963 * Init UST app hash table. Alloc hash table before this point since
4964 * cleanup() can get called after that point.
4965 */
4966 ust_app_ht_alloc();
4967
4968 /* Initialize JUL domain subsystem. */
4969 if ((ret = jul_init()) < 0) {
4970 /* ENOMEM at this point. */
4971 goto error;
4972 }
4973
4974 /* After this point, we can safely call cleanup() with "goto exit" */
4975
4976 /*
4977 * These actions must be executed as root. We do that *after* setting up
4978 * the sockets path because we MUST make the check for another daemon using
4979 * those paths *before* trying to set the kernel consumer sockets and init
4980 * kernel tracer.
4981 */
4982 if (is_root) {
4983 ret = set_consumer_sockets(&kconsumer_data, rundir);
4984 if (ret < 0) {
4985 goto exit;
4986 }
4987
4988 /* Setup kernel tracer */
4989 if (!opt_no_kernel) {
4990 init_kernel_tracer();
4991 }
4992
4993 /* Set ulimit for open files */
4994 set_ulimit();
4995 }
4996 /* init lttng_fd tracking must be done after set_ulimit. */
4997 lttng_fd_init();
4998
4999 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
5000 if (ret < 0) {
5001 goto exit;
5002 }
5003
5004 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
5005 if (ret < 0) {
5006 goto exit;
5007 }
5008
5009 /* Setup the needed unix socket */
5010 if ((ret = init_daemon_socket()) < 0) {
5011 goto exit;
5012 }
5013
5014 /* Set credentials to socket */
5015 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
5016 goto exit;
5017 }
5018
5019 /* Get parent pid if -S, --sig-parent is specified. */
5020 if (opt_sig_parent) {
5021 ppid = getppid();
5022 }
5023
5024 /* Setup the kernel pipe for waking up the kernel thread */
5025 if (is_root && !opt_no_kernel) {
5026 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
5027 goto exit;
5028 }
5029 }
5030
5031 /* Setup the thread ht_cleanup communication pipe. */
5032 if (utils_create_pipe_cloexec(ht_cleanup_pipe) < 0) {
5033 goto exit;
5034 }
5035
5036 /* Setup the thread apps communication pipe. */
5037 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
5038 goto exit;
5039 }
5040
5041 /* Setup the thread apps notify communication pipe. */
5042 if (utils_create_pipe_cloexec(apps_cmd_notify_pipe) < 0) {
5043 goto exit;
5044 }
5045
5046 /* Initialize global buffer per UID and PID registry. */
5047 buffer_reg_init_uid_registry();
5048 buffer_reg_init_pid_registry();
5049
5050 /* Init UST command queue. */
5051 cds_wfq_init(&ust_cmd_queue.queue);
5052
5053 /*
5054 * Get session list pointer. This pointer MUST NOT be free(). This list is
5055 * statically declared in session.c
5056 */
5057 session_list_ptr = session_get_list();
5058
5059 /* Set up max poll set size */
5060 lttng_poll_set_max_size();
5061
5062 cmd_init();
5063
5064 /* Check for the application socket timeout env variable. */
5065 env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
5066 if (env_app_timeout) {
5067 app_socket_timeout = atoi(env_app_timeout);
5068 } else {
5069 app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
5070 }
5071
5072 write_pidfile();
5073 write_julport();
5074
5075 /* Initialize communication library */
5076 lttcomm_init();
5077 /* This is to get the TCP timeout value. */
5078 lttcomm_inet_init();
5079
5080 /*
5081 * Initialize the health check subsystem. This call should set the
5082 * appropriate time values.
5083 */
5084 health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
5085 if (!health_sessiond) {
5086 PERROR("health_app_create error");
5087 goto exit_health_sessiond_cleanup;
5088 }
5089
5090 /* Create thread to clean up RCU hash tables */
5091 ret = pthread_create(&ht_cleanup_thread, NULL,
5092 thread_ht_cleanup, (void *) NULL);
5093 if (ret != 0) {
5094 PERROR("pthread_create ht_cleanup");
5095 goto exit_ht_cleanup;
5096 }
5097
5098 /* Create health-check thread */
5099 ret = pthread_create(&health_thread, NULL,
5100 thread_manage_health, (void *) NULL);
5101 if (ret != 0) {
5102 PERROR("pthread_create health");
5103 goto exit_health;
5104 }
5105
5106 /* Create thread to manage the client socket */
5107 ret = pthread_create(&client_thread, NULL,
5108 thread_manage_clients, (void *) NULL);
5109 if (ret != 0) {
5110 PERROR("pthread_create clients");
5111 goto exit_client;
5112 }
5113
5114 /* Create thread to dispatch registration */
5115 ret = pthread_create(&dispatch_thread, NULL,
5116 thread_dispatch_ust_registration, (void *) NULL);
5117 if (ret != 0) {
5118 PERROR("pthread_create dispatch");
5119 goto exit_dispatch;
5120 }
5121
5122 /* Create thread to manage application registration. */
5123 ret = pthread_create(&reg_apps_thread, NULL,
5124 thread_registration_apps, (void *) NULL);
5125 if (ret != 0) {
5126 PERROR("pthread_create registration");
5127 goto exit_reg_apps;
5128 }
5129
5130 /* Create thread to manage application socket */
5131 ret = pthread_create(&apps_thread, NULL,
5132 thread_manage_apps, (void *) NULL);
5133 if (ret != 0) {
5134 PERROR("pthread_create apps");
5135 goto exit_apps;
5136 }
5137
5138 /* Create thread to manage application notify socket */
5139 ret = pthread_create(&apps_notify_thread, NULL,
5140 ust_thread_manage_notify, (void *) NULL);
5141 if (ret != 0) {
5142 PERROR("pthread_create apps");
5143 goto exit_apps_notify;
5144 }
5145
5146 /* Create JUL registration thread. */
5147 ret = pthread_create(&jul_reg_thread, NULL,
5148 jul_thread_manage_registration, (void *) NULL);
5149 if (ret != 0) {
5150 PERROR("pthread_create apps");
5151 goto exit_jul_reg;
5152 }
5153
5154 /* Don't start this thread if kernel tracing is not requested nor root */
5155 if (is_root && !opt_no_kernel) {
5156 /* Create kernel thread to manage kernel event */
5157 ret = pthread_create(&kernel_thread, NULL,
5158 thread_manage_kernel, (void *) NULL);
5159 if (ret != 0) {
5160 PERROR("pthread_create kernel");
5161 goto exit_kernel;
5162 }
5163
5164 ret = pthread_join(kernel_thread, &status);
5165 if (ret != 0) {
5166 PERROR("pthread_join");
5167 goto error; /* join error, exit without cleanup */
5168 }
5169 }
5170
5171 exit_kernel:
5172 ret = pthread_join(jul_reg_thread, &status);
5173 if (ret != 0) {
5174 PERROR("pthread_join JUL");
5175 goto error; /* join error, exit without cleanup */
5176 }
5177
5178 exit_jul_reg:
5179 ret = pthread_join(apps_notify_thread, &status);
5180 if (ret != 0) {
5181 PERROR("pthread_join apps notify");
5182 goto error; /* join error, exit without cleanup */
5183 }
5184
5185 exit_apps_notify:
5186 ret = pthread_join(apps_thread, &status);
5187 if (ret != 0) {
5188 PERROR("pthread_join apps");
5189 goto error; /* join error, exit without cleanup */
5190 }
5191
5192
5193 exit_apps:
5194 ret = pthread_join(reg_apps_thread, &status);
5195 if (ret != 0) {
5196 PERROR("pthread_join");
5197 goto error; /* join error, exit without cleanup */
5198 }
5199
5200 exit_reg_apps:
5201 ret = pthread_join(dispatch_thread, &status);
5202 if (ret != 0) {
5203 PERROR("pthread_join");
5204 goto error; /* join error, exit without cleanup */
5205 }
5206
5207 exit_dispatch:
5208 ret = pthread_join(client_thread, &status);
5209 if (ret != 0) {
5210 PERROR("pthread_join");
5211 goto error; /* join error, exit without cleanup */
5212 }
5213
5214 ret = join_consumer_thread(&kconsumer_data);
5215 if (ret != 0) {
5216 PERROR("join_consumer");
5217 goto error; /* join error, exit without cleanup */
5218 }
5219
5220 ret = join_consumer_thread(&ustconsumer32_data);
5221 if (ret != 0) {
5222 PERROR("join_consumer ust32");
5223 goto error; /* join error, exit without cleanup */
5224 }
5225
5226 ret = join_consumer_thread(&ustconsumer64_data);
5227 if (ret != 0) {
5228 PERROR("join_consumer ust64");
5229 goto error; /* join error, exit without cleanup */
5230 }
5231
5232 exit_client:
5233 ret = pthread_join(health_thread, &status);
5234 if (ret != 0) {
5235 PERROR("pthread_join health thread");
5236 goto error; /* join error, exit without cleanup */
5237 }
5238
5239 exit_health:
5240 ret = pthread_join(ht_cleanup_thread, &status);
5241 if (ret != 0) {
5242 PERROR("pthread_join ht cleanup thread");
5243 goto error; /* join error, exit without cleanup */
5244 }
5245 exit_ht_cleanup:
5246 health_app_destroy(health_sessiond);
5247 exit_health_sessiond_cleanup:
5248 exit:
5249 /*
5250 * cleanup() is called when no other thread is running.
5251 */
5252 rcu_thread_online();
5253 cleanup();
5254 rcu_thread_offline();
5255 rcu_unregister_thread();
5256 if (!ret) {
5257 exit(EXIT_SUCCESS);
5258 }
5259 error:
5260 exit(EXIT_FAILURE);
5261 }
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