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Add pipe creation to utils facility
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License, version 2 only,
7 * as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <getopt.h>
21 #include <grp.h>
22 #include <limits.h>
23 #include <pthread.h>
24 #include <semaphore.h>
25 #include <signal.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <sys/mman.h>
30 #include <sys/mount.h>
31 #include <sys/resource.h>
32 #include <sys/socket.h>
33 #include <sys/stat.h>
34 #include <sys/types.h>
35 #include <sys/wait.h>
36 #include <urcu/uatomic.h>
37 #include <unistd.h>
38 #include <config.h>
39
40 #include <common/common.h>
41 #include <common/compat/poll.h>
42 #include <common/compat/socket.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46 #include <common/futex.h>
47
48 #include "lttng-sessiond.h"
49 #include "channel.h"
50 #include "context.h"
51 #include "event.h"
52 #include "kernel.h"
53 #include "kernel-consumer.h"
54 #include "modprobe.h"
55 #include "shm.h"
56 #include "ust-ctl.h"
57 #include "utils.h"
58 #include "fd-limit.h"
59
60 #define CONSUMERD_FILE "lttng-consumerd"
61
62 /* Const values */
63 const char default_home_dir[] = DEFAULT_HOME_DIR;
64 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
65 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
66 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
67
68 const char *progname;
69 const char *opt_tracing_group;
70 static int opt_sig_parent;
71 static int opt_verbose_consumer;
72 static int opt_daemon;
73 static int opt_no_kernel;
74 static int is_root; /* Set to 1 if the daemon is running as root */
75 static pid_t ppid; /* Parent PID for --sig-parent option */
76 static char *rundir;
77
78 /* Consumer daemon specific control data */
79 static struct consumer_data kconsumer_data = {
80 .type = LTTNG_CONSUMER_KERNEL,
81 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
82 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
83 .err_sock = -1,
84 .cmd_sock = -1,
85 };
86 static struct consumer_data ustconsumer64_data = {
87 .type = LTTNG_CONSUMER64_UST,
88 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
89 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
90 .err_sock = -1,
91 .cmd_sock = -1,
92 };
93 static struct consumer_data ustconsumer32_data = {
94 .type = LTTNG_CONSUMER32_UST,
95 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
96 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
97 .err_sock = -1,
98 .cmd_sock = -1,
99 };
100
101 static int dispatch_thread_exit;
102
103 /* Global application Unix socket path */
104 static char apps_unix_sock_path[PATH_MAX];
105 /* Global client Unix socket path */
106 static char client_unix_sock_path[PATH_MAX];
107 /* global wait shm path for UST */
108 static char wait_shm_path[PATH_MAX];
109
110 /* Sockets and FDs */
111 static int client_sock = -1;
112 static int apps_sock = -1;
113 static int kernel_tracer_fd = -1;
114 static int kernel_poll_pipe[2] = { -1, -1 };
115
116 /*
117 * Quit pipe for all threads. This permits a single cancellation point
118 * for all threads when receiving an event on the pipe.
119 */
120 static int thread_quit_pipe[2] = { -1, -1 };
121
122 /*
123 * This pipe is used to inform the thread managing application communication
124 * that a command is queued and ready to be processed.
125 */
126 static int apps_cmd_pipe[2] = { -1, -1 };
127
128 /* Pthread, Mutexes and Semaphores */
129 static pthread_t apps_thread;
130 static pthread_t reg_apps_thread;
131 static pthread_t client_thread;
132 static pthread_t kernel_thread;
133 static pthread_t dispatch_thread;
134
135
136 /*
137 * UST registration command queue. This queue is tied with a futex and uses a N
138 * wakers / 1 waiter implemented and detailed in futex.c/.h
139 *
140 * The thread_manage_apps and thread_dispatch_ust_registration interact with
141 * this queue and the wait/wake scheme.
142 */
143 static struct ust_cmd_queue ust_cmd_queue;
144
145 /*
146 * Pointer initialized before thread creation.
147 *
148 * This points to the tracing session list containing the session count and a
149 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
150 * MUST NOT be taken if you call a public function in session.c.
151 *
152 * The lock is nested inside the structure: session_list_ptr->lock. Please use
153 * session_lock_list and session_unlock_list for lock acquisition.
154 */
155 static struct ltt_session_list *session_list_ptr;
156
157 int ust_consumerd64_fd = -1;
158 int ust_consumerd32_fd = -1;
159
160 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
161 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
162 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
163 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
164
165 /*
166 * Consumer daemon state which is changed when spawning it, killing it or in
167 * case of a fatal error.
168 */
169 enum consumerd_state {
170 CONSUMER_STARTED = 1,
171 CONSUMER_STOPPED = 2,
172 CONSUMER_ERROR = 3,
173 };
174
175 /*
176 * This consumer daemon state is used to validate if a client command will be
177 * able to reach the consumer. If not, the client is informed. For instance,
178 * doing a "lttng start" when the consumer state is set to ERROR will return an
179 * error to the client.
180 *
181 * The following example shows a possible race condition of this scheme:
182 *
183 * consumer thread error happens
184 * client cmd arrives
185 * client cmd checks state -> still OK
186 * consumer thread exit, sets error
187 * client cmd try to talk to consumer
188 * ...
189 *
190 * However, since the consumer is a different daemon, we have no way of making
191 * sure the command will reach it safely even with this state flag. This is why
192 * we consider that up to the state validation during command processing, the
193 * command is safe. After that, we can not guarantee the correctness of the
194 * client request vis-a-vis the consumer.
195 */
196 static enum consumerd_state ust_consumerd_state;
197 static enum consumerd_state kernel_consumerd_state;
198
199 static
200 void setup_consumerd_path(void)
201 {
202 const char *bin, *libdir;
203
204 /*
205 * Allow INSTALL_BIN_PATH to be used as a target path for the
206 * native architecture size consumer if CONFIG_CONSUMER*_PATH
207 * has not been defined.
208 */
209 #if (CAA_BITS_PER_LONG == 32)
210 if (!consumerd32_bin[0]) {
211 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
212 }
213 if (!consumerd32_libdir[0]) {
214 consumerd32_libdir = INSTALL_LIB_PATH;
215 }
216 #elif (CAA_BITS_PER_LONG == 64)
217 if (!consumerd64_bin[0]) {
218 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
219 }
220 if (!consumerd64_libdir[0]) {
221 consumerd64_libdir = INSTALL_LIB_PATH;
222 }
223 #else
224 #error "Unknown bitness"
225 #endif
226
227 /*
228 * runtime env. var. overrides the build default.
229 */
230 bin = getenv("LTTNG_CONSUMERD32_BIN");
231 if (bin) {
232 consumerd32_bin = bin;
233 }
234 bin = getenv("LTTNG_CONSUMERD64_BIN");
235 if (bin) {
236 consumerd64_bin = bin;
237 }
238 libdir = getenv("LTTNG_CONSUMERD32_LIBDIR");
239 if (libdir) {
240 consumerd32_libdir = libdir;
241 }
242 libdir = getenv("LTTNG_CONSUMERD64_LIBDIR");
243 if (libdir) {
244 consumerd64_libdir = libdir;
245 }
246 }
247
248 /*
249 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
250 */
251 static int create_thread_poll_set(struct lttng_poll_event *events,
252 unsigned int size)
253 {
254 int ret;
255
256 if (events == NULL || size == 0) {
257 ret = -1;
258 goto error;
259 }
260
261 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
262 if (ret < 0) {
263 goto error;
264 }
265
266 /* Add quit pipe */
267 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
268 if (ret < 0) {
269 goto error;
270 }
271
272 return 0;
273
274 error:
275 return ret;
276 }
277
278 /*
279 * Check if the thread quit pipe was triggered.
280 *
281 * Return 1 if it was triggered else 0;
282 */
283 static int check_thread_quit_pipe(int fd, uint32_t events)
284 {
285 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
286 return 1;
287 }
288
289 return 0;
290 }
291
292 /*
293 * Return group ID of the tracing group or -1 if not found.
294 */
295 static gid_t allowed_group(void)
296 {
297 struct group *grp;
298
299 if (opt_tracing_group) {
300 grp = getgrnam(opt_tracing_group);
301 } else {
302 grp = getgrnam(default_tracing_group);
303 }
304 if (!grp) {
305 return -1;
306 } else {
307 return grp->gr_gid;
308 }
309 }
310
311 /*
312 * Init thread quit pipe.
313 *
314 * Return -1 on error or 0 if all pipes are created.
315 */
316 static int init_thread_quit_pipe(void)
317 {
318 int ret, i;
319
320 ret = pipe(thread_quit_pipe);
321 if (ret < 0) {
322 PERROR("thread quit pipe");
323 goto error;
324 }
325
326 for (i = 0; i < 2; i++) {
327 ret = fcntl(thread_quit_pipe[i], F_SETFD, FD_CLOEXEC);
328 if (ret < 0) {
329 PERROR("fcntl");
330 goto error;
331 }
332 }
333
334 error:
335 return ret;
336 }
337
338 /*
339 * Complete teardown of a kernel session. This free all data structure related
340 * to a kernel session and update counter.
341 */
342 static void teardown_kernel_session(struct ltt_session *session)
343 {
344 if (!session->kernel_session) {
345 DBG3("No kernel session when tearing down session");
346 return;
347 }
348
349 DBG("Tearing down kernel session");
350
351 /*
352 * If a custom kernel consumer was registered, close the socket before
353 * tearing down the complete kernel session structure
354 */
355 if (kconsumer_data.cmd_sock >= 0 &&
356 session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
357 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
358 }
359
360 trace_kernel_destroy_session(session->kernel_session);
361 }
362
363 /*
364 * Complete teardown of all UST sessions. This will free everything on his path
365 * and destroy the core essence of all ust sessions :)
366 */
367 static void teardown_ust_session(struct ltt_session *session)
368 {
369 int ret;
370
371 if (!session->ust_session) {
372 DBG3("No UST session when tearing down session");
373 return;
374 }
375
376 DBG("Tearing down UST session(s)");
377
378 ret = ust_app_destroy_trace_all(session->ust_session);
379 if (ret) {
380 ERR("Error in ust_app_destroy_trace_all");
381 }
382
383 trace_ust_destroy_session(session->ust_session);
384 }
385
386 /*
387 * Stop all threads by closing the thread quit pipe.
388 */
389 static void stop_threads(void)
390 {
391 int ret;
392
393 /* Stopping all threads */
394 DBG("Terminating all threads");
395 ret = notify_thread_pipe(thread_quit_pipe[1]);
396 if (ret < 0) {
397 ERR("write error on thread quit pipe");
398 }
399
400 /* Dispatch thread */
401 dispatch_thread_exit = 1;
402 futex_nto1_wake(&ust_cmd_queue.futex);
403 }
404
405 /*
406 * Cleanup the daemon
407 */
408 static void cleanup(void)
409 {
410 int ret;
411 char *cmd;
412 struct ltt_session *sess, *stmp;
413
414 DBG("Cleaning up");
415
416 DBG("Removing %s directory", rundir);
417 ret = asprintf(&cmd, "rm -rf %s", rundir);
418 if (ret < 0) {
419 ERR("asprintf failed. Something is really wrong!");
420 }
421
422 /* Remove lttng run directory */
423 ret = system(cmd);
424 if (ret < 0) {
425 ERR("Unable to clean %s", rundir);
426 }
427 free(cmd);
428
429 DBG("Cleaning up all sessions");
430
431 /* Destroy session list mutex */
432 if (session_list_ptr != NULL) {
433 pthread_mutex_destroy(&session_list_ptr->lock);
434
435 /* Cleanup ALL session */
436 cds_list_for_each_entry_safe(sess, stmp,
437 &session_list_ptr->head, list) {
438 teardown_kernel_session(sess);
439 teardown_ust_session(sess);
440 free(sess);
441 }
442 }
443
444 DBG("Closing all UST sockets");
445 ust_app_clean_list();
446
447 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
448
449 if (is_root && !opt_no_kernel) {
450 DBG2("Closing kernel fd");
451 if (kernel_tracer_fd >= 0) {
452 ret = close(kernel_tracer_fd);
453 if (ret) {
454 PERROR("close");
455 }
456 }
457 DBG("Unloading kernel modules");
458 modprobe_remove_lttng_all();
459 }
460 utils_close_pipe(kernel_poll_pipe);
461 utils_close_pipe(thread_quit_pipe);
462 utils_close_pipe(apps_cmd_pipe);
463
464 /* <fun> */
465 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
466 "Matthew, BEET driven development works!%c[%dm",
467 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
468 /* </fun> */
469 }
470
471 /*
472 * Send data on a unix socket using the liblttsessiondcomm API.
473 *
474 * Return lttcomm error code.
475 */
476 static int send_unix_sock(int sock, void *buf, size_t len)
477 {
478 /* Check valid length */
479 if (len <= 0) {
480 return -1;
481 }
482
483 return lttcomm_send_unix_sock(sock, buf, len);
484 }
485
486 /*
487 * Free memory of a command context structure.
488 */
489 static void clean_command_ctx(struct command_ctx **cmd_ctx)
490 {
491 DBG("Clean command context structure");
492 if (*cmd_ctx) {
493 if ((*cmd_ctx)->llm) {
494 free((*cmd_ctx)->llm);
495 }
496 if ((*cmd_ctx)->lsm) {
497 free((*cmd_ctx)->lsm);
498 }
499 free(*cmd_ctx);
500 *cmd_ctx = NULL;
501 }
502 }
503
504 /*
505 * Notify UST applications using the shm mmap futex.
506 */
507 static int notify_ust_apps(int active)
508 {
509 char *wait_shm_mmap;
510
511 DBG("Notifying applications of session daemon state: %d", active);
512
513 /* See shm.c for this call implying mmap, shm and futex calls */
514 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
515 if (wait_shm_mmap == NULL) {
516 goto error;
517 }
518
519 /* Wake waiting process */
520 futex_wait_update((int32_t *) wait_shm_mmap, active);
521
522 /* Apps notified successfully */
523 return 0;
524
525 error:
526 return -1;
527 }
528
529 /*
530 * Setup the outgoing data buffer for the response (llm) by allocating the
531 * right amount of memory and copying the original information from the lsm
532 * structure.
533 *
534 * Return total size of the buffer pointed by buf.
535 */
536 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
537 {
538 int ret, buf_size;
539
540 buf_size = size;
541
542 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
543 if (cmd_ctx->llm == NULL) {
544 PERROR("zmalloc");
545 ret = -ENOMEM;
546 goto error;
547 }
548
549 /* Copy common data */
550 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
551 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
552
553 cmd_ctx->llm->data_size = size;
554 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
555
556 return buf_size;
557
558 error:
559 return ret;
560 }
561
562 /*
563 * Update the kernel poll set of all channel fd available over all tracing
564 * session. Add the wakeup pipe at the end of the set.
565 */
566 static int update_kernel_poll(struct lttng_poll_event *events)
567 {
568 int ret;
569 struct ltt_session *session;
570 struct ltt_kernel_channel *channel;
571
572 DBG("Updating kernel poll set");
573
574 session_lock_list();
575 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
576 session_lock(session);
577 if (session->kernel_session == NULL) {
578 session_unlock(session);
579 continue;
580 }
581
582 cds_list_for_each_entry(channel,
583 &session->kernel_session->channel_list.head, list) {
584 /* Add channel fd to the kernel poll set */
585 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
586 if (ret < 0) {
587 session_unlock(session);
588 goto error;
589 }
590 DBG("Channel fd %d added to kernel set", channel->fd);
591 }
592 session_unlock(session);
593 }
594 session_unlock_list();
595
596 return 0;
597
598 error:
599 session_unlock_list();
600 return -1;
601 }
602
603 /*
604 * Find the channel fd from 'fd' over all tracing session. When found, check
605 * for new channel stream and send those stream fds to the kernel consumer.
606 *
607 * Useful for CPU hotplug feature.
608 */
609 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
610 {
611 int ret = 0;
612 struct ltt_session *session;
613 struct ltt_kernel_channel *channel;
614
615 DBG("Updating kernel streams for channel fd %d", fd);
616
617 session_lock_list();
618 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
619 session_lock(session);
620 if (session->kernel_session == NULL) {
621 session_unlock(session);
622 continue;
623 }
624
625 /* This is not suppose to be -1 but this is an extra security check */
626 if (session->kernel_session->consumer_fd < 0) {
627 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
628 }
629
630 cds_list_for_each_entry(channel,
631 &session->kernel_session->channel_list.head, list) {
632 if (channel->fd == fd) {
633 DBG("Channel found, updating kernel streams");
634 ret = kernel_open_channel_stream(channel);
635 if (ret < 0) {
636 goto error;
637 }
638
639 /*
640 * Have we already sent fds to the consumer? If yes, it means
641 * that tracing is started so it is safe to send our updated
642 * stream fds.
643 */
644 if (session->kernel_session->consumer_fds_sent == 1) {
645 ret = kernel_consumer_send_channel_stream(consumer_data,
646 session->kernel_session->consumer_fd, channel,
647 session->uid, session->gid);
648 if (ret < 0) {
649 goto error;
650 }
651 }
652 goto error;
653 }
654 }
655 session_unlock(session);
656 }
657 session_unlock_list();
658 return ret;
659
660 error:
661 session_unlock(session);
662 session_unlock_list();
663 return ret;
664 }
665
666 /*
667 * For each tracing session, update newly registered apps.
668 */
669 static void update_ust_app(int app_sock)
670 {
671 struct ltt_session *sess, *stmp;
672
673 session_lock_list();
674
675 /* For all tracing session(s) */
676 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
677 session_lock(sess);
678 if (sess->ust_session) {
679 ust_app_global_update(sess->ust_session, app_sock);
680 }
681 session_unlock(sess);
682 }
683
684 session_unlock_list();
685 }
686
687 /*
688 * This thread manage event coming from the kernel.
689 *
690 * Features supported in this thread:
691 * -) CPU Hotplug
692 */
693 static void *thread_manage_kernel(void *data)
694 {
695 int ret, i, pollfd, update_poll_flag = 1;
696 uint32_t revents, nb_fd;
697 char tmp;
698 struct lttng_poll_event events;
699
700 DBG("Thread manage kernel started");
701
702 ret = create_thread_poll_set(&events, 2);
703 if (ret < 0) {
704 goto error_poll_create;
705 }
706
707 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
708 if (ret < 0) {
709 goto error;
710 }
711
712 while (1) {
713 if (update_poll_flag == 1) {
714 /*
715 * Reset number of fd in the poll set. Always 2 since there is the thread
716 * quit pipe and the kernel pipe.
717 */
718 events.nb_fd = 2;
719
720 ret = update_kernel_poll(&events);
721 if (ret < 0) {
722 goto error;
723 }
724 update_poll_flag = 0;
725 }
726
727 nb_fd = LTTNG_POLL_GETNB(&events);
728
729 DBG("Thread kernel polling on %d fds", nb_fd);
730
731 /* Zeroed the poll events */
732 lttng_poll_reset(&events);
733
734 /* Poll infinite value of time */
735 restart:
736 ret = lttng_poll_wait(&events, -1);
737 if (ret < 0) {
738 /*
739 * Restart interrupted system call.
740 */
741 if (errno == EINTR) {
742 goto restart;
743 }
744 goto error;
745 } else if (ret == 0) {
746 /* Should not happen since timeout is infinite */
747 ERR("Return value of poll is 0 with an infinite timeout.\n"
748 "This should not have happened! Continuing...");
749 continue;
750 }
751
752 for (i = 0; i < nb_fd; i++) {
753 /* Fetch once the poll data */
754 revents = LTTNG_POLL_GETEV(&events, i);
755 pollfd = LTTNG_POLL_GETFD(&events, i);
756
757 /* Thread quit pipe has been closed. Killing thread. */
758 ret = check_thread_quit_pipe(pollfd, revents);
759 if (ret) {
760 goto error;
761 }
762
763 /* Check for data on kernel pipe */
764 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
765 ret = read(kernel_poll_pipe[0], &tmp, 1);
766 update_poll_flag = 1;
767 continue;
768 } else {
769 /*
770 * New CPU detected by the kernel. Adding kernel stream to
771 * kernel session and updating the kernel consumer
772 */
773 if (revents & LPOLLIN) {
774 ret = update_kernel_stream(&kconsumer_data, pollfd);
775 if (ret < 0) {
776 continue;
777 }
778 break;
779 /*
780 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
781 * and unregister kernel stream at this point.
782 */
783 }
784 }
785 }
786 }
787
788 error:
789 lttng_poll_clean(&events);
790 error_poll_create:
791 DBG("Kernel thread dying");
792 return NULL;
793 }
794
795 /*
796 * This thread manage the consumer error sent back to the session daemon.
797 */
798 static void *thread_manage_consumer(void *data)
799 {
800 int sock = -1, i, ret, pollfd;
801 uint32_t revents, nb_fd;
802 enum lttcomm_return_code code;
803 struct lttng_poll_event events;
804 struct consumer_data *consumer_data = data;
805
806 DBG("[thread] Manage consumer started");
807
808 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
809 if (ret < 0) {
810 goto error_listen;
811 }
812
813 /*
814 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
815 * Nothing more will be added to this poll set.
816 */
817 ret = create_thread_poll_set(&events, 2);
818 if (ret < 0) {
819 goto error_poll;
820 }
821
822 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
823 if (ret < 0) {
824 goto error;
825 }
826
827 nb_fd = LTTNG_POLL_GETNB(&events);
828
829 /* Inifinite blocking call, waiting for transmission */
830 restart:
831 ret = lttng_poll_wait(&events, -1);
832 if (ret < 0) {
833 /*
834 * Restart interrupted system call.
835 */
836 if (errno == EINTR) {
837 goto restart;
838 }
839 goto error;
840 }
841
842 for (i = 0; i < nb_fd; i++) {
843 /* Fetch once the poll data */
844 revents = LTTNG_POLL_GETEV(&events, i);
845 pollfd = LTTNG_POLL_GETFD(&events, i);
846
847 /* Thread quit pipe has been closed. Killing thread. */
848 ret = check_thread_quit_pipe(pollfd, revents);
849 if (ret) {
850 goto error;
851 }
852
853 /* Event on the registration socket */
854 if (pollfd == consumer_data->err_sock) {
855 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
856 ERR("consumer err socket poll error");
857 goto error;
858 }
859 }
860 }
861
862 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
863 if (sock < 0) {
864 goto error;
865 }
866
867 DBG2("Receiving code from consumer err_sock");
868
869 /* Getting status code from kconsumerd */
870 ret = lttcomm_recv_unix_sock(sock, &code,
871 sizeof(enum lttcomm_return_code));
872 if (ret <= 0) {
873 goto error;
874 }
875
876 if (code == CONSUMERD_COMMAND_SOCK_READY) {
877 consumer_data->cmd_sock =
878 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
879 if (consumer_data->cmd_sock < 0) {
880 sem_post(&consumer_data->sem);
881 PERROR("consumer connect");
882 goto error;
883 }
884 /* Signal condition to tell that the kconsumerd is ready */
885 sem_post(&consumer_data->sem);
886 DBG("consumer command socket ready");
887 } else {
888 ERR("consumer error when waiting for SOCK_READY : %s",
889 lttcomm_get_readable_code(-code));
890 goto error;
891 }
892
893 /* Remove the kconsumerd error sock since we've established a connexion */
894 ret = lttng_poll_del(&events, consumer_data->err_sock);
895 if (ret < 0) {
896 goto error;
897 }
898
899 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
900 if (ret < 0) {
901 goto error;
902 }
903
904 /* Update number of fd */
905 nb_fd = LTTNG_POLL_GETNB(&events);
906
907 /* Inifinite blocking call, waiting for transmission */
908 restart_poll:
909 ret = lttng_poll_wait(&events, -1);
910 if (ret < 0) {
911 /*
912 * Restart interrupted system call.
913 */
914 if (errno == EINTR) {
915 goto restart_poll;
916 }
917 goto error;
918 }
919
920 for (i = 0; i < nb_fd; i++) {
921 /* Fetch once the poll data */
922 revents = LTTNG_POLL_GETEV(&events, i);
923 pollfd = LTTNG_POLL_GETFD(&events, i);
924
925 /* Thread quit pipe has been closed. Killing thread. */
926 ret = check_thread_quit_pipe(pollfd, revents);
927 if (ret) {
928 goto error;
929 }
930
931 /* Event on the kconsumerd socket */
932 if (pollfd == sock) {
933 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
934 ERR("consumer err socket second poll error");
935 goto error;
936 }
937 }
938 }
939
940 /* Wait for any kconsumerd error */
941 ret = lttcomm_recv_unix_sock(sock, &code,
942 sizeof(enum lttcomm_return_code));
943 if (ret <= 0) {
944 ERR("consumer closed the command socket");
945 goto error;
946 }
947
948 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
949
950 error:
951 /* Immediately set the consumerd state to stopped */
952 if (consumer_data->type == LTTNG_CONSUMER_KERNEL) {
953 uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR);
954 } else if (consumer_data->type == LTTNG_CONSUMER64_UST ||
955 consumer_data->type == LTTNG_CONSUMER32_UST) {
956 uatomic_set(&ust_consumerd_state, CONSUMER_ERROR);
957 } else {
958 /* Code flow error... */
959 assert(0);
960 }
961
962 if (consumer_data->err_sock >= 0) {
963 ret = close(consumer_data->err_sock);
964 if (ret) {
965 PERROR("close");
966 }
967 }
968 if (consumer_data->cmd_sock >= 0) {
969 ret = close(consumer_data->cmd_sock);
970 if (ret) {
971 PERROR("close");
972 }
973 }
974 if (sock >= 0) {
975 ret = close(sock);
976 if (ret) {
977 PERROR("close");
978 }
979 }
980
981 unlink(consumer_data->err_unix_sock_path);
982 unlink(consumer_data->cmd_unix_sock_path);
983 consumer_data->pid = 0;
984
985 lttng_poll_clean(&events);
986 error_poll:
987 error_listen:
988 DBG("consumer thread cleanup completed");
989
990 return NULL;
991 }
992
993 /*
994 * This thread manage application communication.
995 */
996 static void *thread_manage_apps(void *data)
997 {
998 int i, ret, pollfd;
999 uint32_t revents, nb_fd;
1000 struct ust_command ust_cmd;
1001 struct lttng_poll_event events;
1002
1003 DBG("[thread] Manage application started");
1004
1005 rcu_register_thread();
1006 rcu_thread_online();
1007
1008 ret = create_thread_poll_set(&events, 2);
1009 if (ret < 0) {
1010 goto error_poll_create;
1011 }
1012
1013 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1014 if (ret < 0) {
1015 goto error;
1016 }
1017
1018 while (1) {
1019 /* Zeroed the events structure */
1020 lttng_poll_reset(&events);
1021
1022 nb_fd = LTTNG_POLL_GETNB(&events);
1023
1024 DBG("Apps thread polling on %d fds", nb_fd);
1025
1026 /* Inifinite blocking call, waiting for transmission */
1027 restart:
1028 ret = lttng_poll_wait(&events, -1);
1029 if (ret < 0) {
1030 /*
1031 * Restart interrupted system call.
1032 */
1033 if (errno == EINTR) {
1034 goto restart;
1035 }
1036 goto error;
1037 }
1038
1039 for (i = 0; i < nb_fd; i++) {
1040 /* Fetch once the poll data */
1041 revents = LTTNG_POLL_GETEV(&events, i);
1042 pollfd = LTTNG_POLL_GETFD(&events, i);
1043
1044 /* Thread quit pipe has been closed. Killing thread. */
1045 ret = check_thread_quit_pipe(pollfd, revents);
1046 if (ret) {
1047 goto error;
1048 }
1049
1050 /* Inspect the apps cmd pipe */
1051 if (pollfd == apps_cmd_pipe[0]) {
1052 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1053 ERR("Apps command pipe error");
1054 goto error;
1055 } else if (revents & LPOLLIN) {
1056 /* Empty pipe */
1057 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1058 if (ret < 0 || ret < sizeof(ust_cmd)) {
1059 PERROR("read apps cmd pipe");
1060 goto error;
1061 }
1062
1063 /* Register applicaton to the session daemon */
1064 ret = ust_app_register(&ust_cmd.reg_msg,
1065 ust_cmd.sock);
1066 if (ret == -ENOMEM) {
1067 goto error;
1068 } else if (ret < 0) {
1069 break;
1070 }
1071
1072 /*
1073 * Validate UST version compatibility.
1074 */
1075 ret = ust_app_validate_version(ust_cmd.sock);
1076 if (ret >= 0) {
1077 /*
1078 * Add channel(s) and event(s) to newly registered apps
1079 * from lttng global UST domain.
1080 */
1081 update_ust_app(ust_cmd.sock);
1082 }
1083
1084 ret = ust_app_register_done(ust_cmd.sock);
1085 if (ret < 0) {
1086 /*
1087 * If the registration is not possible, we simply
1088 * unregister the apps and continue
1089 */
1090 ust_app_unregister(ust_cmd.sock);
1091 } else {
1092 /*
1093 * We just need here to monitor the close of the UST
1094 * socket and poll set monitor those by default.
1095 * Listen on POLLIN (even if we never expect any
1096 * data) to ensure that hangup wakes us.
1097 */
1098 ret = lttng_poll_add(&events, ust_cmd.sock, LPOLLIN);
1099 if (ret < 0) {
1100 goto error;
1101 }
1102
1103 DBG("Apps with sock %d added to poll set",
1104 ust_cmd.sock);
1105 }
1106
1107 break;
1108 }
1109 } else {
1110 /*
1111 * At this point, we know that a registered application made
1112 * the event at poll_wait.
1113 */
1114 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1115 /* Removing from the poll set */
1116 ret = lttng_poll_del(&events, pollfd);
1117 if (ret < 0) {
1118 goto error;
1119 }
1120
1121 /* Socket closed on remote end. */
1122 ust_app_unregister(pollfd);
1123 break;
1124 }
1125 }
1126 }
1127 }
1128
1129 error:
1130 lttng_poll_clean(&events);
1131 error_poll_create:
1132 DBG("Application communication apps thread cleanup complete");
1133 rcu_thread_offline();
1134 rcu_unregister_thread();
1135 return NULL;
1136 }
1137
1138 /*
1139 * Dispatch request from the registration threads to the application
1140 * communication thread.
1141 */
1142 static void *thread_dispatch_ust_registration(void *data)
1143 {
1144 int ret;
1145 struct cds_wfq_node *node;
1146 struct ust_command *ust_cmd = NULL;
1147
1148 DBG("[thread] Dispatch UST command started");
1149
1150 while (!dispatch_thread_exit) {
1151 /* Atomically prepare the queue futex */
1152 futex_nto1_prepare(&ust_cmd_queue.futex);
1153
1154 do {
1155 /* Dequeue command for registration */
1156 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1157 if (node == NULL) {
1158 DBG("Woken up but nothing in the UST command queue");
1159 /* Continue thread execution */
1160 break;
1161 }
1162
1163 ust_cmd = caa_container_of(node, struct ust_command, node);
1164
1165 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1166 " gid:%d sock:%d name:%s (version %d.%d)",
1167 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1168 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1169 ust_cmd->sock, ust_cmd->reg_msg.name,
1170 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1171 /*
1172 * Inform apps thread of the new application registration. This
1173 * call is blocking so we can be assured that the data will be read
1174 * at some point in time or wait to the end of the world :)
1175 */
1176 ret = write(apps_cmd_pipe[1], ust_cmd,
1177 sizeof(struct ust_command));
1178 if (ret < 0) {
1179 PERROR("write apps cmd pipe");
1180 if (errno == EBADF) {
1181 /*
1182 * We can't inform the application thread to process
1183 * registration. We will exit or else application
1184 * registration will not occur and tracing will never
1185 * start.
1186 */
1187 goto error;
1188 }
1189 }
1190 free(ust_cmd);
1191 } while (node != NULL);
1192
1193 /* Futex wait on queue. Blocking call on futex() */
1194 futex_nto1_wait(&ust_cmd_queue.futex);
1195 }
1196
1197 error:
1198 DBG("Dispatch thread dying");
1199 return NULL;
1200 }
1201
1202 /*
1203 * This thread manage application registration.
1204 */
1205 static void *thread_registration_apps(void *data)
1206 {
1207 int sock = -1, i, ret, pollfd;
1208 uint32_t revents, nb_fd;
1209 struct lttng_poll_event events;
1210 /*
1211 * Get allocated in this thread, enqueued to a global queue, dequeued and
1212 * freed in the manage apps thread.
1213 */
1214 struct ust_command *ust_cmd = NULL;
1215
1216 DBG("[thread] Manage application registration started");
1217
1218 ret = lttcomm_listen_unix_sock(apps_sock);
1219 if (ret < 0) {
1220 goto error_listen;
1221 }
1222
1223 /*
1224 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1225 * more will be added to this poll set.
1226 */
1227 ret = create_thread_poll_set(&events, 2);
1228 if (ret < 0) {
1229 goto error_create_poll;
1230 }
1231
1232 /* Add the application registration socket */
1233 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1234 if (ret < 0) {
1235 goto error_poll_add;
1236 }
1237
1238 /* Notify all applications to register */
1239 ret = notify_ust_apps(1);
1240 if (ret < 0) {
1241 ERR("Failed to notify applications or create the wait shared memory.\n"
1242 "Execution continues but there might be problem for already\n"
1243 "running applications that wishes to register.");
1244 }
1245
1246 while (1) {
1247 DBG("Accepting application registration");
1248
1249 nb_fd = LTTNG_POLL_GETNB(&events);
1250
1251 /* Inifinite blocking call, waiting for transmission */
1252 restart:
1253 ret = lttng_poll_wait(&events, -1);
1254 if (ret < 0) {
1255 /*
1256 * Restart interrupted system call.
1257 */
1258 if (errno == EINTR) {
1259 goto restart;
1260 }
1261 goto error;
1262 }
1263
1264 for (i = 0; i < nb_fd; i++) {
1265 /* Fetch once the poll data */
1266 revents = LTTNG_POLL_GETEV(&events, i);
1267 pollfd = LTTNG_POLL_GETFD(&events, i);
1268
1269 /* Thread quit pipe has been closed. Killing thread. */
1270 ret = check_thread_quit_pipe(pollfd, revents);
1271 if (ret) {
1272 goto error;
1273 }
1274
1275 /* Event on the registration socket */
1276 if (pollfd == apps_sock) {
1277 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1278 ERR("Register apps socket poll error");
1279 goto error;
1280 } else if (revents & LPOLLIN) {
1281 sock = lttcomm_accept_unix_sock(apps_sock);
1282 if (sock < 0) {
1283 goto error;
1284 }
1285
1286 /* Create UST registration command for enqueuing */
1287 ust_cmd = zmalloc(sizeof(struct ust_command));
1288 if (ust_cmd == NULL) {
1289 PERROR("ust command zmalloc");
1290 goto error;
1291 }
1292
1293 /*
1294 * Using message-based transmissions to ensure we don't
1295 * have to deal with partially received messages.
1296 */
1297 ret = lttng_fd_get(LTTNG_FD_APPS, 1);
1298 if (ret < 0) {
1299 ERR("Exhausted file descriptors allowed for applications.");
1300 free(ust_cmd);
1301 ret = close(sock);
1302 if (ret) {
1303 PERROR("close");
1304 }
1305 sock = -1;
1306 continue;
1307 }
1308 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1309 sizeof(struct ust_register_msg));
1310 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1311 if (ret < 0) {
1312 PERROR("lttcomm_recv_unix_sock register apps");
1313 } else {
1314 ERR("Wrong size received on apps register");
1315 }
1316 free(ust_cmd);
1317 ret = close(sock);
1318 if (ret) {
1319 PERROR("close");
1320 }
1321 lttng_fd_put(LTTNG_FD_APPS, 1);
1322 sock = -1;
1323 continue;
1324 }
1325
1326 ust_cmd->sock = sock;
1327 sock = -1;
1328
1329 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1330 " gid:%d sock:%d name:%s (version %d.%d)",
1331 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1332 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1333 ust_cmd->sock, ust_cmd->reg_msg.name,
1334 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1335
1336 /*
1337 * Lock free enqueue the registration request. The red pill
1338 * has been taken! This apps will be part of the *system*.
1339 */
1340 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1341
1342 /*
1343 * Wake the registration queue futex. Implicit memory
1344 * barrier with the exchange in cds_wfq_enqueue.
1345 */
1346 futex_nto1_wake(&ust_cmd_queue.futex);
1347 }
1348 }
1349 }
1350 }
1351
1352 error:
1353 /* Notify that the registration thread is gone */
1354 notify_ust_apps(0);
1355
1356 if (apps_sock >= 0) {
1357 ret = close(apps_sock);
1358 if (ret) {
1359 PERROR("close");
1360 }
1361 }
1362 if (sock >= 0) {
1363 ret = close(sock);
1364 if (ret) {
1365 PERROR("close");
1366 }
1367 lttng_fd_put(LTTNG_FD_APPS, 1);
1368 }
1369 unlink(apps_unix_sock_path);
1370
1371 error_poll_add:
1372 lttng_poll_clean(&events);
1373 error_listen:
1374 error_create_poll:
1375 DBG("UST Registration thread cleanup complete");
1376
1377 return NULL;
1378 }
1379
1380 /*
1381 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1382 * exec or it will fails.
1383 */
1384 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1385 {
1386 int ret;
1387 struct timespec timeout;
1388
1389 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1390 timeout.tv_nsec = 0;
1391
1392 /* Setup semaphore */
1393 ret = sem_init(&consumer_data->sem, 0, 0);
1394 if (ret < 0) {
1395 PERROR("sem_init consumer semaphore");
1396 goto error;
1397 }
1398
1399 ret = pthread_create(&consumer_data->thread, NULL,
1400 thread_manage_consumer, consumer_data);
1401 if (ret != 0) {
1402 PERROR("pthread_create consumer");
1403 ret = -1;
1404 goto error;
1405 }
1406
1407 /* Get time for sem_timedwait absolute timeout */
1408 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1409 if (ret < 0) {
1410 PERROR("clock_gettime spawn consumer");
1411 /* Infinite wait for the kconsumerd thread to be ready */
1412 ret = sem_wait(&consumer_data->sem);
1413 } else {
1414 /* Normal timeout if the gettime was successful */
1415 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1416 ret = sem_timedwait(&consumer_data->sem, &timeout);
1417 }
1418
1419 if (ret < 0) {
1420 if (errno == ETIMEDOUT) {
1421 /*
1422 * Call has timed out so we kill the kconsumerd_thread and return
1423 * an error.
1424 */
1425 ERR("The consumer thread was never ready. Killing it");
1426 ret = pthread_cancel(consumer_data->thread);
1427 if (ret < 0) {
1428 PERROR("pthread_cancel consumer thread");
1429 }
1430 } else {
1431 PERROR("semaphore wait failed consumer thread");
1432 }
1433 goto error;
1434 }
1435
1436 pthread_mutex_lock(&consumer_data->pid_mutex);
1437 if (consumer_data->pid == 0) {
1438 ERR("Kconsumerd did not start");
1439 pthread_mutex_unlock(&consumer_data->pid_mutex);
1440 goto error;
1441 }
1442 pthread_mutex_unlock(&consumer_data->pid_mutex);
1443
1444 return 0;
1445
1446 error:
1447 return ret;
1448 }
1449
1450 /*
1451 * Join consumer thread
1452 */
1453 static int join_consumer_thread(struct consumer_data *consumer_data)
1454 {
1455 void *status;
1456 int ret;
1457
1458 if (consumer_data->pid != 0) {
1459 ret = kill(consumer_data->pid, SIGTERM);
1460 if (ret) {
1461 ERR("Error killing consumer daemon");
1462 return ret;
1463 }
1464 return pthread_join(consumer_data->thread, &status);
1465 } else {
1466 return 0;
1467 }
1468 }
1469
1470 /*
1471 * Fork and exec a consumer daemon (consumerd).
1472 *
1473 * Return pid if successful else -1.
1474 */
1475 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1476 {
1477 int ret;
1478 pid_t pid;
1479 const char *consumer_to_use;
1480 const char *verbosity;
1481 struct stat st;
1482
1483 DBG("Spawning consumerd");
1484
1485 pid = fork();
1486 if (pid == 0) {
1487 /*
1488 * Exec consumerd.
1489 */
1490 if (opt_verbose_consumer) {
1491 verbosity = "--verbose";
1492 } else {
1493 verbosity = "--quiet";
1494 }
1495 switch (consumer_data->type) {
1496 case LTTNG_CONSUMER_KERNEL:
1497 /*
1498 * Find out which consumerd to execute. We will first try the
1499 * 64-bit path, then the sessiond's installation directory, and
1500 * fallback on the 32-bit one,
1501 */
1502 DBG3("Looking for a kernel consumer at these locations:");
1503 DBG3(" 1) %s", consumerd64_bin);
1504 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1505 DBG3(" 3) %s", consumerd32_bin);
1506 if (stat(consumerd64_bin, &st) == 0) {
1507 DBG3("Found location #1");
1508 consumer_to_use = consumerd64_bin;
1509 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1510 DBG3("Found location #2");
1511 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1512 } else if (stat(consumerd32_bin, &st) == 0) {
1513 DBG3("Found location #3");
1514 consumer_to_use = consumerd32_bin;
1515 } else {
1516 DBG("Could not find any valid consumerd executable");
1517 break;
1518 }
1519 DBG("Using kernel consumer at: %s", consumer_to_use);
1520 execl(consumer_to_use,
1521 "lttng-consumerd", verbosity, "-k",
1522 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1523 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1524 NULL);
1525 break;
1526 case LTTNG_CONSUMER64_UST:
1527 {
1528 char *tmpnew = NULL;
1529
1530 if (consumerd64_libdir[0] != '\0') {
1531 char *tmp;
1532 size_t tmplen;
1533
1534 tmp = getenv("LD_LIBRARY_PATH");
1535 if (!tmp) {
1536 tmp = "";
1537 }
1538 tmplen = strlen("LD_LIBRARY_PATH=")
1539 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1540 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1541 if (!tmpnew) {
1542 ret = -ENOMEM;
1543 goto error;
1544 }
1545 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1546 strcat(tmpnew, consumerd64_libdir);
1547 if (tmp[0] != '\0') {
1548 strcat(tmpnew, ":");
1549 strcat(tmpnew, tmp);
1550 }
1551 ret = putenv(tmpnew);
1552 if (ret) {
1553 ret = -errno;
1554 goto error;
1555 }
1556 }
1557 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1558 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1559 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1560 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1561 NULL);
1562 if (consumerd64_libdir[0] != '\0') {
1563 free(tmpnew);
1564 }
1565 if (ret) {
1566 goto error;
1567 }
1568 break;
1569 }
1570 case LTTNG_CONSUMER32_UST:
1571 {
1572 char *tmpnew = NULL;
1573
1574 if (consumerd32_libdir[0] != '\0') {
1575 char *tmp;
1576 size_t tmplen;
1577
1578 tmp = getenv("LD_LIBRARY_PATH");
1579 if (!tmp) {
1580 tmp = "";
1581 }
1582 tmplen = strlen("LD_LIBRARY_PATH=")
1583 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1584 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1585 if (!tmpnew) {
1586 ret = -ENOMEM;
1587 goto error;
1588 }
1589 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1590 strcat(tmpnew, consumerd32_libdir);
1591 if (tmp[0] != '\0') {
1592 strcat(tmpnew, ":");
1593 strcat(tmpnew, tmp);
1594 }
1595 ret = putenv(tmpnew);
1596 if (ret) {
1597 ret = -errno;
1598 goto error;
1599 }
1600 }
1601 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1602 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1603 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1604 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1605 NULL);
1606 if (consumerd32_libdir[0] != '\0') {
1607 free(tmpnew);
1608 }
1609 if (ret) {
1610 goto error;
1611 }
1612 break;
1613 }
1614 default:
1615 PERROR("unknown consumer type");
1616 exit(EXIT_FAILURE);
1617 }
1618 if (errno != 0) {
1619 PERROR("kernel start consumer exec");
1620 }
1621 exit(EXIT_FAILURE);
1622 } else if (pid > 0) {
1623 ret = pid;
1624 } else {
1625 PERROR("start consumer fork");
1626 ret = -errno;
1627 }
1628 error:
1629 return ret;
1630 }
1631
1632 /*
1633 * Spawn the consumerd daemon and session daemon thread.
1634 */
1635 static int start_consumerd(struct consumer_data *consumer_data)
1636 {
1637 int ret;
1638
1639 pthread_mutex_lock(&consumer_data->pid_mutex);
1640 if (consumer_data->pid != 0) {
1641 pthread_mutex_unlock(&consumer_data->pid_mutex);
1642 goto end;
1643 }
1644
1645 ret = spawn_consumerd(consumer_data);
1646 if (ret < 0) {
1647 ERR("Spawning consumerd failed");
1648 pthread_mutex_unlock(&consumer_data->pid_mutex);
1649 goto error;
1650 }
1651
1652 /* Setting up the consumer_data pid */
1653 consumer_data->pid = ret;
1654 DBG2("Consumer pid %d", consumer_data->pid);
1655 pthread_mutex_unlock(&consumer_data->pid_mutex);
1656
1657 DBG2("Spawning consumer control thread");
1658 ret = spawn_consumer_thread(consumer_data);
1659 if (ret < 0) {
1660 ERR("Fatal error spawning consumer control thread");
1661 goto error;
1662 }
1663
1664 end:
1665 return 0;
1666
1667 error:
1668 return ret;
1669 }
1670
1671 /*
1672 * Check version of the lttng-modules.
1673 */
1674 static int validate_lttng_modules_version(void)
1675 {
1676 return kernel_validate_version(kernel_tracer_fd);
1677 }
1678
1679 /*
1680 * Setup necessary data for kernel tracer action.
1681 */
1682 static int init_kernel_tracer(void)
1683 {
1684 int ret;
1685
1686 /* Modprobe lttng kernel modules */
1687 ret = modprobe_lttng_control();
1688 if (ret < 0) {
1689 goto error;
1690 }
1691
1692 /* Open debugfs lttng */
1693 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1694 if (kernel_tracer_fd < 0) {
1695 DBG("Failed to open %s", module_proc_lttng);
1696 ret = -1;
1697 goto error_open;
1698 }
1699
1700 /* Validate kernel version */
1701 ret = validate_lttng_modules_version();
1702 if (ret < 0) {
1703 goto error_version;
1704 }
1705
1706 ret = modprobe_lttng_data();
1707 if (ret < 0) {
1708 goto error_modules;
1709 }
1710
1711 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1712 return 0;
1713
1714 error_version:
1715 modprobe_remove_lttng_control();
1716 ret = close(kernel_tracer_fd);
1717 if (ret) {
1718 PERROR("close");
1719 }
1720 kernel_tracer_fd = -1;
1721 return LTTCOMM_KERN_VERSION;
1722
1723 error_modules:
1724 ret = close(kernel_tracer_fd);
1725 if (ret) {
1726 PERROR("close");
1727 }
1728
1729 error_open:
1730 modprobe_remove_lttng_control();
1731
1732 error:
1733 WARN("No kernel tracer available");
1734 kernel_tracer_fd = -1;
1735 if (!is_root) {
1736 return LTTCOMM_NEED_ROOT_SESSIOND;
1737 } else {
1738 return LTTCOMM_KERN_NA;
1739 }
1740 }
1741
1742 /*
1743 * Init tracing by creating trace directory and sending fds kernel consumer.
1744 */
1745 static int init_kernel_tracing(struct ltt_kernel_session *session)
1746 {
1747 int ret = 0;
1748
1749 if (session->consumer_fds_sent == 0) {
1750 /*
1751 * Assign default kernel consumer socket if no consumer assigned to the
1752 * kernel session. At this point, it's NOT supposed to be -1 but this is
1753 * an extra security check.
1754 */
1755 if (session->consumer_fd < 0) {
1756 session->consumer_fd = kconsumer_data.cmd_sock;
1757 }
1758
1759 ret = kernel_consumer_send_session(&kconsumer_data, session);
1760 if (ret < 0) {
1761 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1762 goto error;
1763 }
1764
1765 session->consumer_fds_sent = 1;
1766 }
1767
1768 error:
1769 return ret;
1770 }
1771
1772 /*
1773 * Create an UST session and add it to the session ust list.
1774 */
1775 static int create_ust_session(struct ltt_session *session,
1776 struct lttng_domain *domain)
1777 {
1778 struct ltt_ust_session *lus = NULL;
1779 int ret;
1780
1781 switch (domain->type) {
1782 case LTTNG_DOMAIN_UST:
1783 break;
1784 default:
1785 ret = LTTCOMM_UNKNOWN_DOMAIN;
1786 goto error;
1787 }
1788
1789 DBG("Creating UST session");
1790
1791 lus = trace_ust_create_session(session->path, session->id, domain);
1792 if (lus == NULL) {
1793 ret = LTTCOMM_UST_SESS_FAIL;
1794 goto error;
1795 }
1796
1797 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1798 session->uid, session->gid);
1799 if (ret < 0) {
1800 if (ret != -EEXIST) {
1801 ERR("Trace directory creation error");
1802 ret = LTTCOMM_UST_SESS_FAIL;
1803 goto error;
1804 }
1805 }
1806
1807 /* The domain type dictate different actions on session creation */
1808 switch (domain->type) {
1809 case LTTNG_DOMAIN_UST:
1810 /* No ustctl for the global UST domain */
1811 break;
1812 default:
1813 ERR("Unknown UST domain on create session %d", domain->type);
1814 goto error;
1815 }
1816 lus->uid = session->uid;
1817 lus->gid = session->gid;
1818 session->ust_session = lus;
1819
1820 return LTTCOMM_OK;
1821
1822 error:
1823 free(lus);
1824 return ret;
1825 }
1826
1827 /*
1828 * Create a kernel tracer session then create the default channel.
1829 */
1830 static int create_kernel_session(struct ltt_session *session)
1831 {
1832 int ret;
1833
1834 DBG("Creating kernel session");
1835
1836 ret = kernel_create_session(session, kernel_tracer_fd);
1837 if (ret < 0) {
1838 ret = LTTCOMM_KERN_SESS_FAIL;
1839 goto error;
1840 }
1841
1842 /* Set kernel consumer socket fd */
1843 if (kconsumer_data.cmd_sock >= 0) {
1844 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1845 }
1846
1847 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1848 S_IRWXU | S_IRWXG, session->uid, session->gid);
1849 if (ret < 0) {
1850 if (ret != -EEXIST) {
1851 ERR("Trace directory creation error");
1852 goto error;
1853 }
1854 }
1855 session->kernel_session->uid = session->uid;
1856 session->kernel_session->gid = session->gid;
1857
1858 error:
1859 return ret;
1860 }
1861
1862 /*
1863 * Check if the UID or GID match the session. Root user has access to all
1864 * sessions.
1865 */
1866 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1867 {
1868 if (uid != session->uid && gid != session->gid && uid != 0) {
1869 return 0;
1870 } else {
1871 return 1;
1872 }
1873 }
1874
1875 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1876 {
1877 unsigned int i = 0;
1878 struct ltt_session *session;
1879
1880 DBG("Counting number of available session for UID %d GID %d",
1881 uid, gid);
1882 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1883 /*
1884 * Only list the sessions the user can control.
1885 */
1886 if (!session_access_ok(session, uid, gid)) {
1887 continue;
1888 }
1889 i++;
1890 }
1891 return i;
1892 }
1893
1894 /*
1895 * Using the session list, filled a lttng_session array to send back to the
1896 * client for session listing.
1897 *
1898 * The session list lock MUST be acquired before calling this function. Use
1899 * session_lock_list() and session_unlock_list().
1900 */
1901 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1902 gid_t gid)
1903 {
1904 unsigned int i = 0;
1905 struct ltt_session *session;
1906
1907 DBG("Getting all available session for UID %d GID %d",
1908 uid, gid);
1909 /*
1910 * Iterate over session list and append data after the control struct in
1911 * the buffer.
1912 */
1913 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1914 /*
1915 * Only list the sessions the user can control.
1916 */
1917 if (!session_access_ok(session, uid, gid)) {
1918 continue;
1919 }
1920 strncpy(sessions[i].path, session->path, PATH_MAX);
1921 sessions[i].path[PATH_MAX - 1] = '\0';
1922 strncpy(sessions[i].name, session->name, NAME_MAX);
1923 sessions[i].name[NAME_MAX - 1] = '\0';
1924 sessions[i].enabled = session->enabled;
1925 i++;
1926 }
1927 }
1928
1929 /*
1930 * Fill lttng_channel array of all channels.
1931 */
1932 static void list_lttng_channels(int domain, struct ltt_session *session,
1933 struct lttng_channel *channels)
1934 {
1935 int i = 0;
1936 struct ltt_kernel_channel *kchan;
1937
1938 DBG("Listing channels for session %s", session->name);
1939
1940 switch (domain) {
1941 case LTTNG_DOMAIN_KERNEL:
1942 /* Kernel channels */
1943 if (session->kernel_session != NULL) {
1944 cds_list_for_each_entry(kchan,
1945 &session->kernel_session->channel_list.head, list) {
1946 /* Copy lttng_channel struct to array */
1947 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1948 channels[i].enabled = kchan->enabled;
1949 i++;
1950 }
1951 }
1952 break;
1953 case LTTNG_DOMAIN_UST:
1954 {
1955 struct lttng_ht_iter iter;
1956 struct ltt_ust_channel *uchan;
1957
1958 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1959 &iter.iter, uchan, node.node) {
1960 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1961 channels[i].attr.overwrite = uchan->attr.overwrite;
1962 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1963 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1964 channels[i].attr.switch_timer_interval =
1965 uchan->attr.switch_timer_interval;
1966 channels[i].attr.read_timer_interval =
1967 uchan->attr.read_timer_interval;
1968 channels[i].enabled = uchan->enabled;
1969 switch (uchan->attr.output) {
1970 case LTTNG_UST_MMAP:
1971 default:
1972 channels[i].attr.output = LTTNG_EVENT_MMAP;
1973 break;
1974 }
1975 i++;
1976 }
1977 break;
1978 }
1979 default:
1980 break;
1981 }
1982 }
1983
1984 /*
1985 * Create a list of ust global domain events.
1986 */
1987 static int list_lttng_ust_global_events(char *channel_name,
1988 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1989 {
1990 int i = 0, ret = 0;
1991 unsigned int nb_event = 0;
1992 struct lttng_ht_iter iter;
1993 struct lttng_ht_node_str *node;
1994 struct ltt_ust_channel *uchan;
1995 struct ltt_ust_event *uevent;
1996 struct lttng_event *tmp;
1997
1998 DBG("Listing UST global events for channel %s", channel_name);
1999
2000 rcu_read_lock();
2001
2002 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
2003 node = lttng_ht_iter_get_node_str(&iter);
2004 if (node == NULL) {
2005 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2006 goto error;
2007 }
2008
2009 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2010
2011 nb_event += lttng_ht_get_count(uchan->events);
2012
2013 if (nb_event == 0) {
2014 ret = nb_event;
2015 goto error;
2016 }
2017
2018 DBG3("Listing UST global %d events", nb_event);
2019
2020 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2021 if (tmp == NULL) {
2022 ret = -LTTCOMM_FATAL;
2023 goto error;
2024 }
2025
2026 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2027 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2028 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2029 tmp[i].enabled = uevent->enabled;
2030 switch (uevent->attr.instrumentation) {
2031 case LTTNG_UST_TRACEPOINT:
2032 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2033 break;
2034 case LTTNG_UST_PROBE:
2035 tmp[i].type = LTTNG_EVENT_PROBE;
2036 break;
2037 case LTTNG_UST_FUNCTION:
2038 tmp[i].type = LTTNG_EVENT_FUNCTION;
2039 break;
2040 }
2041 tmp[i].loglevel = uevent->attr.loglevel;
2042 switch (uevent->attr.loglevel_type) {
2043 case LTTNG_UST_LOGLEVEL_ALL:
2044 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_ALL;
2045 break;
2046 case LTTNG_UST_LOGLEVEL_RANGE:
2047 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_RANGE;
2048 break;
2049 case LTTNG_UST_LOGLEVEL_SINGLE:
2050 tmp[i].loglevel_type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2051 break;
2052 }
2053 i++;
2054 }
2055
2056 ret = nb_event;
2057 *events = tmp;
2058
2059 error:
2060 rcu_read_unlock();
2061 return ret;
2062 }
2063
2064 /*
2065 * Fill lttng_event array of all kernel events in the channel.
2066 */
2067 static int list_lttng_kernel_events(char *channel_name,
2068 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2069 {
2070 int i = 0, ret;
2071 unsigned int nb_event;
2072 struct ltt_kernel_event *event;
2073 struct ltt_kernel_channel *kchan;
2074
2075 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2076 if (kchan == NULL) {
2077 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2078 goto error;
2079 }
2080
2081 nb_event = kchan->event_count;
2082
2083 DBG("Listing events for channel %s", kchan->channel->name);
2084
2085 if (nb_event == 0) {
2086 ret = nb_event;
2087 goto error;
2088 }
2089
2090 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2091 if (*events == NULL) {
2092 ret = LTTCOMM_FATAL;
2093 goto error;
2094 }
2095
2096 /* Kernel channels */
2097 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2098 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2099 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2100 (*events)[i].enabled = event->enabled;
2101 switch (event->event->instrumentation) {
2102 case LTTNG_KERNEL_TRACEPOINT:
2103 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2104 break;
2105 case LTTNG_KERNEL_KPROBE:
2106 case LTTNG_KERNEL_KRETPROBE:
2107 (*events)[i].type = LTTNG_EVENT_PROBE;
2108 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2109 sizeof(struct lttng_kernel_kprobe));
2110 break;
2111 case LTTNG_KERNEL_FUNCTION:
2112 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2113 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2114 sizeof(struct lttng_kernel_function));
2115 break;
2116 case LTTNG_KERNEL_NOOP:
2117 (*events)[i].type = LTTNG_EVENT_NOOP;
2118 break;
2119 case LTTNG_KERNEL_SYSCALL:
2120 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2121 break;
2122 case LTTNG_KERNEL_ALL:
2123 assert(0);
2124 break;
2125 }
2126 i++;
2127 }
2128
2129 return nb_event;
2130
2131 error:
2132 return ret;
2133 }
2134
2135 /*
2136 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2137 */
2138 static int cmd_disable_channel(struct ltt_session *session,
2139 int domain, char *channel_name)
2140 {
2141 int ret;
2142 struct ltt_ust_session *usess;
2143
2144 usess = session->ust_session;
2145
2146 switch (domain) {
2147 case LTTNG_DOMAIN_KERNEL:
2148 {
2149 ret = channel_kernel_disable(session->kernel_session,
2150 channel_name);
2151 if (ret != LTTCOMM_OK) {
2152 goto error;
2153 }
2154
2155 kernel_wait_quiescent(kernel_tracer_fd);
2156 break;
2157 }
2158 case LTTNG_DOMAIN_UST:
2159 {
2160 struct ltt_ust_channel *uchan;
2161 struct lttng_ht *chan_ht;
2162
2163 chan_ht = usess->domain_global.channels;
2164
2165 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2166 if (uchan == NULL) {
2167 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2168 goto error;
2169 }
2170
2171 ret = channel_ust_disable(usess, domain, uchan);
2172 if (ret != LTTCOMM_OK) {
2173 goto error;
2174 }
2175 break;
2176 }
2177 #if 0
2178 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2179 case LTTNG_DOMAIN_UST_EXEC_NAME:
2180 case LTTNG_DOMAIN_UST_PID:
2181 #endif
2182 default:
2183 ret = LTTCOMM_UNKNOWN_DOMAIN;
2184 goto error;
2185 }
2186
2187 ret = LTTCOMM_OK;
2188
2189 error:
2190 return ret;
2191 }
2192
2193 /*
2194 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2195 */
2196 static int cmd_enable_channel(struct ltt_session *session,
2197 int domain, struct lttng_channel *attr)
2198 {
2199 int ret;
2200 struct ltt_ust_session *usess = session->ust_session;
2201 struct lttng_ht *chan_ht;
2202
2203 DBG("Enabling channel %s for session %s", attr->name, session->name);
2204
2205 switch (domain) {
2206 case LTTNG_DOMAIN_KERNEL:
2207 {
2208 struct ltt_kernel_channel *kchan;
2209
2210 kchan = trace_kernel_get_channel_by_name(attr->name,
2211 session->kernel_session);
2212 if (kchan == NULL) {
2213 ret = channel_kernel_create(session->kernel_session,
2214 attr, kernel_poll_pipe[1]);
2215 } else {
2216 ret = channel_kernel_enable(session->kernel_session, kchan);
2217 }
2218
2219 if (ret != LTTCOMM_OK) {
2220 goto error;
2221 }
2222
2223 kernel_wait_quiescent(kernel_tracer_fd);
2224 break;
2225 }
2226 case LTTNG_DOMAIN_UST:
2227 {
2228 struct ltt_ust_channel *uchan;
2229
2230 chan_ht = usess->domain_global.channels;
2231
2232 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2233 if (uchan == NULL) {
2234 ret = channel_ust_create(usess, domain, attr);
2235 } else {
2236 ret = channel_ust_enable(usess, domain, uchan);
2237 }
2238 break;
2239 }
2240 #if 0
2241 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2242 case LTTNG_DOMAIN_UST_EXEC_NAME:
2243 case LTTNG_DOMAIN_UST_PID:
2244 #endif
2245 default:
2246 ret = LTTCOMM_UNKNOWN_DOMAIN;
2247 goto error;
2248 }
2249
2250 error:
2251 return ret;
2252 }
2253
2254 /*
2255 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2256 */
2257 static int cmd_disable_event(struct ltt_session *session, int domain,
2258 char *channel_name, char *event_name)
2259 {
2260 int ret;
2261
2262 switch (domain) {
2263 case LTTNG_DOMAIN_KERNEL:
2264 {
2265 struct ltt_kernel_channel *kchan;
2266 struct ltt_kernel_session *ksess;
2267
2268 ksess = session->kernel_session;
2269
2270 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2271 if (kchan == NULL) {
2272 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2273 goto error;
2274 }
2275
2276 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2277 if (ret != LTTCOMM_OK) {
2278 goto error;
2279 }
2280
2281 kernel_wait_quiescent(kernel_tracer_fd);
2282 break;
2283 }
2284 case LTTNG_DOMAIN_UST:
2285 {
2286 struct ltt_ust_channel *uchan;
2287 struct ltt_ust_session *usess;
2288
2289 usess = session->ust_session;
2290
2291 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2292 channel_name);
2293 if (uchan == NULL) {
2294 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2295 goto error;
2296 }
2297
2298 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2299 if (ret != LTTCOMM_OK) {
2300 goto error;
2301 }
2302
2303 DBG3("Disable UST event %s in channel %s completed", event_name,
2304 channel_name);
2305 break;
2306 }
2307 #if 0
2308 case LTTNG_DOMAIN_UST_EXEC_NAME:
2309 case LTTNG_DOMAIN_UST_PID:
2310 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2311 #endif
2312 default:
2313 ret = LTTCOMM_UND;
2314 goto error;
2315 }
2316
2317 ret = LTTCOMM_OK;
2318
2319 error:
2320 return ret;
2321 }
2322
2323 /*
2324 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2325 */
2326 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2327 char *channel_name)
2328 {
2329 int ret;
2330
2331 switch (domain) {
2332 case LTTNG_DOMAIN_KERNEL:
2333 {
2334 struct ltt_kernel_session *ksess;
2335 struct ltt_kernel_channel *kchan;
2336
2337 ksess = session->kernel_session;
2338
2339 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2340 if (kchan == NULL) {
2341 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2342 goto error;
2343 }
2344
2345 ret = event_kernel_disable_all(ksess, kchan);
2346 if (ret != LTTCOMM_OK) {
2347 goto error;
2348 }
2349
2350 kernel_wait_quiescent(kernel_tracer_fd);
2351 break;
2352 }
2353 case LTTNG_DOMAIN_UST:
2354 {
2355 struct ltt_ust_session *usess;
2356 struct ltt_ust_channel *uchan;
2357
2358 usess = session->ust_session;
2359
2360 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2361 channel_name);
2362 if (uchan == NULL) {
2363 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2364 goto error;
2365 }
2366
2367 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2368 if (ret != 0) {
2369 goto error;
2370 }
2371
2372 DBG3("Disable all UST events in channel %s completed", channel_name);
2373
2374 break;
2375 }
2376 #if 0
2377 case LTTNG_DOMAIN_UST_EXEC_NAME:
2378 case LTTNG_DOMAIN_UST_PID:
2379 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2380 #endif
2381 default:
2382 ret = LTTCOMM_UND;
2383 goto error;
2384 }
2385
2386 ret = LTTCOMM_OK;
2387
2388 error:
2389 return ret;
2390 }
2391
2392 /*
2393 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2394 */
2395 static int cmd_add_context(struct ltt_session *session, int domain,
2396 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2397 {
2398 int ret;
2399
2400 switch (domain) {
2401 case LTTNG_DOMAIN_KERNEL:
2402 /* Add kernel context to kernel tracer */
2403 ret = context_kernel_add(session->kernel_session, ctx,
2404 event_name, channel_name);
2405 if (ret != LTTCOMM_OK) {
2406 goto error;
2407 }
2408 break;
2409 case LTTNG_DOMAIN_UST:
2410 {
2411 struct ltt_ust_session *usess = session->ust_session;
2412
2413 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2414 if (ret != LTTCOMM_OK) {
2415 goto error;
2416 }
2417 break;
2418 }
2419 #if 0
2420 case LTTNG_DOMAIN_UST_EXEC_NAME:
2421 case LTTNG_DOMAIN_UST_PID:
2422 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2423 #endif
2424 default:
2425 ret = LTTCOMM_UND;
2426 goto error;
2427 }
2428
2429 ret = LTTCOMM_OK;
2430
2431 error:
2432 return ret;
2433 }
2434
2435 /*
2436 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2437 */
2438 static int cmd_enable_event(struct ltt_session *session, int domain,
2439 char *channel_name, struct lttng_event *event)
2440 {
2441 int ret;
2442 struct lttng_channel *attr;
2443 struct ltt_ust_session *usess = session->ust_session;
2444
2445 switch (domain) {
2446 case LTTNG_DOMAIN_KERNEL:
2447 {
2448 struct ltt_kernel_channel *kchan;
2449
2450 kchan = trace_kernel_get_channel_by_name(channel_name,
2451 session->kernel_session);
2452 if (kchan == NULL) {
2453 attr = channel_new_default_attr(domain);
2454 if (attr == NULL) {
2455 ret = LTTCOMM_FATAL;
2456 goto error;
2457 }
2458 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2459
2460 /* This call will notify the kernel thread */
2461 ret = channel_kernel_create(session->kernel_session,
2462 attr, kernel_poll_pipe[1]);
2463 if (ret != LTTCOMM_OK) {
2464 free(attr);
2465 goto error;
2466 }
2467 free(attr);
2468 }
2469
2470 /* Get the newly created kernel channel pointer */
2471 kchan = trace_kernel_get_channel_by_name(channel_name,
2472 session->kernel_session);
2473 if (kchan == NULL) {
2474 /* This sould not happen... */
2475 ret = LTTCOMM_FATAL;
2476 goto error;
2477 }
2478
2479 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2480 event);
2481 if (ret != LTTCOMM_OK) {
2482 goto error;
2483 }
2484
2485 kernel_wait_quiescent(kernel_tracer_fd);
2486 break;
2487 }
2488 case LTTNG_DOMAIN_UST:
2489 {
2490 struct lttng_channel *attr;
2491 struct ltt_ust_channel *uchan;
2492
2493 /* Get channel from global UST domain */
2494 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2495 channel_name);
2496 if (uchan == NULL) {
2497 /* Create default channel */
2498 attr = channel_new_default_attr(domain);
2499 if (attr == NULL) {
2500 ret = LTTCOMM_FATAL;
2501 goto error;
2502 }
2503 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2504 attr->name[NAME_MAX - 1] = '\0';
2505
2506 ret = channel_ust_create(usess, domain, attr);
2507 if (ret != LTTCOMM_OK) {
2508 free(attr);
2509 goto error;
2510 }
2511 free(attr);
2512
2513 /* Get the newly created channel reference back */
2514 uchan = trace_ust_find_channel_by_name(
2515 usess->domain_global.channels, channel_name);
2516 if (uchan == NULL) {
2517 /* Something is really wrong */
2518 ret = LTTCOMM_FATAL;
2519 goto error;
2520 }
2521 }
2522
2523 /* At this point, the session and channel exist on the tracer */
2524 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2525 if (ret != LTTCOMM_OK) {
2526 goto error;
2527 }
2528 break;
2529 }
2530 #if 0
2531 case LTTNG_DOMAIN_UST_EXEC_NAME:
2532 case LTTNG_DOMAIN_UST_PID:
2533 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2534 #endif
2535 default:
2536 ret = LTTCOMM_UND;
2537 goto error;
2538 }
2539
2540 ret = LTTCOMM_OK;
2541
2542 error:
2543 return ret;
2544 }
2545
2546 /*
2547 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2548 */
2549 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2550 char *channel_name, int event_type)
2551 {
2552 int ret;
2553 struct ltt_kernel_channel *kchan;
2554
2555 switch (domain) {
2556 case LTTNG_DOMAIN_KERNEL:
2557 kchan = trace_kernel_get_channel_by_name(channel_name,
2558 session->kernel_session);
2559 if (kchan == NULL) {
2560 /* This call will notify the kernel thread */
2561 ret = channel_kernel_create(session->kernel_session, NULL,
2562 kernel_poll_pipe[1]);
2563 if (ret != LTTCOMM_OK) {
2564 goto error;
2565 }
2566
2567 /* Get the newly created kernel channel pointer */
2568 kchan = trace_kernel_get_channel_by_name(channel_name,
2569 session->kernel_session);
2570 if (kchan == NULL) {
2571 /* This sould not happen... */
2572 ret = LTTCOMM_FATAL;
2573 goto error;
2574 }
2575
2576 }
2577
2578 switch (event_type) {
2579 case LTTNG_EVENT_SYSCALL:
2580 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2581 kchan, kernel_tracer_fd);
2582 break;
2583 case LTTNG_EVENT_TRACEPOINT:
2584 /*
2585 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2586 * events already registered to the channel.
2587 */
2588 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2589 kchan, kernel_tracer_fd);
2590 break;
2591 case LTTNG_EVENT_ALL:
2592 /* Enable syscalls and tracepoints */
2593 ret = event_kernel_enable_all(session->kernel_session,
2594 kchan, kernel_tracer_fd);
2595 break;
2596 default:
2597 ret = LTTCOMM_KERN_ENABLE_FAIL;
2598 goto error;
2599 }
2600
2601 /* Manage return value */
2602 if (ret != LTTCOMM_OK) {
2603 goto error;
2604 }
2605
2606 kernel_wait_quiescent(kernel_tracer_fd);
2607 break;
2608 case LTTNG_DOMAIN_UST:
2609 {
2610 struct lttng_channel *attr;
2611 struct ltt_ust_channel *uchan;
2612 struct ltt_ust_session *usess = session->ust_session;
2613
2614 /* Get channel from global UST domain */
2615 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2616 channel_name);
2617 if (uchan == NULL) {
2618 /* Create default channel */
2619 attr = channel_new_default_attr(domain);
2620 if (attr == NULL) {
2621 ret = LTTCOMM_FATAL;
2622 goto error;
2623 }
2624 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2625 attr->name[NAME_MAX - 1] = '\0';
2626
2627 /* Use the internal command enable channel */
2628 ret = channel_ust_create(usess, domain, attr);
2629 if (ret != LTTCOMM_OK) {
2630 free(attr);
2631 goto error;
2632 }
2633 free(attr);
2634
2635 /* Get the newly created channel reference back */
2636 uchan = trace_ust_find_channel_by_name(
2637 usess->domain_global.channels, channel_name);
2638 if (uchan == NULL) {
2639 /* Something is really wrong */
2640 ret = LTTCOMM_FATAL;
2641 goto error;
2642 }
2643 }
2644
2645 /* At this point, the session and channel exist on the tracer */
2646
2647 switch (event_type) {
2648 case LTTNG_EVENT_ALL:
2649 case LTTNG_EVENT_TRACEPOINT:
2650 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2651 if (ret != LTTCOMM_OK) {
2652 goto error;
2653 }
2654 break;
2655 default:
2656 ret = LTTCOMM_UST_ENABLE_FAIL;
2657 goto error;
2658 }
2659
2660 /* Manage return value */
2661 if (ret != LTTCOMM_OK) {
2662 goto error;
2663 }
2664
2665 break;
2666 }
2667 #if 0
2668 case LTTNG_DOMAIN_UST_EXEC_NAME:
2669 case LTTNG_DOMAIN_UST_PID:
2670 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2671 #endif
2672 default:
2673 ret = LTTCOMM_UND;
2674 goto error;
2675 }
2676
2677 ret = LTTCOMM_OK;
2678
2679 error:
2680 return ret;
2681 }
2682
2683 /*
2684 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2685 */
2686 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2687 {
2688 int ret;
2689 ssize_t nb_events = 0;
2690
2691 switch (domain) {
2692 case LTTNG_DOMAIN_KERNEL:
2693 nb_events = kernel_list_events(kernel_tracer_fd, events);
2694 if (nb_events < 0) {
2695 ret = LTTCOMM_KERN_LIST_FAIL;
2696 goto error;
2697 }
2698 break;
2699 case LTTNG_DOMAIN_UST:
2700 nb_events = ust_app_list_events(events);
2701 if (nb_events < 0) {
2702 ret = LTTCOMM_UST_LIST_FAIL;
2703 goto error;
2704 }
2705 break;
2706 default:
2707 ret = LTTCOMM_UND;
2708 goto error;
2709 }
2710
2711 return nb_events;
2712
2713 error:
2714 /* Return negative value to differentiate return code */
2715 return -ret;
2716 }
2717
2718 /*
2719 * Command LTTNG_LIST_TRACEPOINT_FIELDS processed by the client thread.
2720 */
2721 static ssize_t cmd_list_tracepoint_fields(int domain,
2722 struct lttng_event_field **fields)
2723 {
2724 int ret;
2725 ssize_t nb_fields = 0;
2726
2727 switch (domain) {
2728 case LTTNG_DOMAIN_UST:
2729 nb_fields = ust_app_list_event_fields(fields);
2730 if (nb_fields < 0) {
2731 ret = LTTCOMM_UST_LIST_FAIL;
2732 goto error;
2733 }
2734 break;
2735 case LTTNG_DOMAIN_KERNEL:
2736 default: /* fall-through */
2737 ret = LTTCOMM_UND;
2738 goto error;
2739 }
2740
2741 return nb_fields;
2742
2743 error:
2744 /* Return negative value to differentiate return code */
2745 return -ret;
2746 }
2747
2748 /*
2749 * Command LTTNG_START_TRACE processed by the client thread.
2750 */
2751 static int cmd_start_trace(struct ltt_session *session)
2752 {
2753 int ret;
2754 struct ltt_kernel_session *ksession;
2755 struct ltt_ust_session *usess;
2756
2757 /* Short cut */
2758 ksession = session->kernel_session;
2759 usess = session->ust_session;
2760
2761 if (session->enabled) {
2762 /* Already started. */
2763 ret = LTTCOMM_TRACE_ALREADY_STARTED;
2764 goto error;
2765 }
2766
2767 session->enabled = 1;
2768
2769 /* Kernel tracing */
2770 if (ksession != NULL) {
2771 struct ltt_kernel_channel *kchan;
2772
2773 /* Open kernel metadata */
2774 if (ksession->metadata == NULL) {
2775 ret = kernel_open_metadata(ksession, ksession->trace_path);
2776 if (ret < 0) {
2777 ret = LTTCOMM_KERN_META_FAIL;
2778 goto error;
2779 }
2780 }
2781
2782 /* Open kernel metadata stream */
2783 if (ksession->metadata_stream_fd < 0) {
2784 ret = kernel_open_metadata_stream(ksession);
2785 if (ret < 0) {
2786 ERR("Kernel create metadata stream failed");
2787 ret = LTTCOMM_KERN_STREAM_FAIL;
2788 goto error;
2789 }
2790 }
2791
2792 /* For each channel */
2793 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2794 if (kchan->stream_count == 0) {
2795 ret = kernel_open_channel_stream(kchan);
2796 if (ret < 0) {
2797 ret = LTTCOMM_KERN_STREAM_FAIL;
2798 goto error;
2799 }
2800 /* Update the stream global counter */
2801 ksession->stream_count_global += ret;
2802 }
2803 }
2804
2805 /* Setup kernel consumer socket and send fds to it */
2806 ret = init_kernel_tracing(ksession);
2807 if (ret < 0) {
2808 ret = LTTCOMM_KERN_START_FAIL;
2809 goto error;
2810 }
2811
2812 /* This start the kernel tracing */
2813 ret = kernel_start_session(ksession);
2814 if (ret < 0) {
2815 ret = LTTCOMM_KERN_START_FAIL;
2816 goto error;
2817 }
2818
2819 /* Quiescent wait after starting trace */
2820 kernel_wait_quiescent(kernel_tracer_fd);
2821 }
2822
2823 /* Flag session that trace should start automatically */
2824 if (usess) {
2825 usess->start_trace = 1;
2826
2827 ret = ust_app_start_trace_all(usess);
2828 if (ret < 0) {
2829 ret = LTTCOMM_UST_START_FAIL;
2830 goto error;
2831 }
2832 }
2833
2834 ret = LTTCOMM_OK;
2835
2836 error:
2837 return ret;
2838 }
2839
2840 /*
2841 * Command LTTNG_STOP_TRACE processed by the client thread.
2842 */
2843 static int cmd_stop_trace(struct ltt_session *session)
2844 {
2845 int ret;
2846 struct ltt_kernel_channel *kchan;
2847 struct ltt_kernel_session *ksession;
2848 struct ltt_ust_session *usess;
2849
2850 /* Short cut */
2851 ksession = session->kernel_session;
2852 usess = session->ust_session;
2853
2854 if (!session->enabled) {
2855 ret = LTTCOMM_TRACE_ALREADY_STOPPED;
2856 goto error;
2857 }
2858
2859 session->enabled = 0;
2860
2861 /* Kernel tracer */
2862 if (ksession != NULL) {
2863 DBG("Stop kernel tracing");
2864
2865 /* Flush all buffers before stopping */
2866 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2867 if (ret < 0) {
2868 ERR("Kernel metadata flush failed");
2869 }
2870
2871 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2872 ret = kernel_flush_buffer(kchan);
2873 if (ret < 0) {
2874 ERR("Kernel flush buffer error");
2875 }
2876 }
2877
2878 ret = kernel_stop_session(ksession);
2879 if (ret < 0) {
2880 ret = LTTCOMM_KERN_STOP_FAIL;
2881 goto error;
2882 }
2883
2884 kernel_wait_quiescent(kernel_tracer_fd);
2885 }
2886
2887 if (usess) {
2888 usess->start_trace = 0;
2889
2890 ret = ust_app_stop_trace_all(usess);
2891 if (ret < 0) {
2892 ret = LTTCOMM_UST_STOP_FAIL;
2893 goto error;
2894 }
2895 }
2896
2897 ret = LTTCOMM_OK;
2898
2899 error:
2900 return ret;
2901 }
2902
2903 /*
2904 * Command LTTNG_CREATE_SESSION processed by the client thread.
2905 */
2906 static int cmd_create_session(char *name, char *path, lttng_sock_cred *creds)
2907 {
2908 int ret;
2909
2910 ret = session_create(name, path, LTTNG_SOCK_GET_UID_CRED(creds),
2911 LTTNG_SOCK_GET_GID_CRED(creds));
2912 if (ret != LTTCOMM_OK) {
2913 goto error;
2914 }
2915
2916 ret = LTTCOMM_OK;
2917
2918 error:
2919 return ret;
2920 }
2921
2922 /*
2923 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2924 */
2925 static int cmd_destroy_session(struct ltt_session *session, char *name)
2926 {
2927 int ret;
2928
2929 /* Clean kernel session teardown */
2930 teardown_kernel_session(session);
2931 /* UST session teardown */
2932 teardown_ust_session(session);
2933
2934 /*
2935 * Must notify the kernel thread here to update it's poll setin order
2936 * to remove the channel(s)' fd just destroyed.
2937 */
2938 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2939 if (ret < 0) {
2940 PERROR("write kernel poll pipe");
2941 }
2942
2943 ret = session_destroy(session);
2944
2945 return ret;
2946 }
2947
2948 /*
2949 * Command LTTNG_CALIBRATE processed by the client thread.
2950 */
2951 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2952 {
2953 int ret;
2954
2955 switch (domain) {
2956 case LTTNG_DOMAIN_KERNEL:
2957 {
2958 struct lttng_kernel_calibrate kcalibrate;
2959
2960 kcalibrate.type = calibrate->type;
2961 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2962 if (ret < 0) {
2963 ret = LTTCOMM_KERN_ENABLE_FAIL;
2964 goto error;
2965 }
2966 break;
2967 }
2968 case LTTNG_DOMAIN_UST:
2969 {
2970 struct lttng_ust_calibrate ucalibrate;
2971
2972 ucalibrate.type = calibrate->type;
2973 ret = ust_app_calibrate_glb(&ucalibrate);
2974 if (ret < 0) {
2975 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2976 goto error;
2977 }
2978 break;
2979 }
2980 default:
2981 ret = LTTCOMM_UND;
2982 goto error;
2983 }
2984
2985 ret = LTTCOMM_OK;
2986
2987 error:
2988 return ret;
2989 }
2990
2991 /*
2992 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2993 */
2994 static int cmd_register_consumer(struct ltt_session *session, int domain,
2995 char *sock_path)
2996 {
2997 int ret, sock;
2998
2999 switch (domain) {
3000 case LTTNG_DOMAIN_KERNEL:
3001 /* Can't register a consumer if there is already one */
3002 if (session->kernel_session->consumer_fds_sent != 0) {
3003 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3004 goto error;
3005 }
3006
3007 sock = lttcomm_connect_unix_sock(sock_path);
3008 if (sock < 0) {
3009 ret = LTTCOMM_CONNECT_FAIL;
3010 goto error;
3011 }
3012
3013 session->kernel_session->consumer_fd = sock;
3014 break;
3015 default:
3016 /* TODO: Userspace tracing */
3017 ret = LTTCOMM_UND;
3018 goto error;
3019 }
3020
3021 ret = LTTCOMM_OK;
3022
3023 error:
3024 return ret;
3025 }
3026
3027 /*
3028 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3029 */
3030 static ssize_t cmd_list_domains(struct ltt_session *session,
3031 struct lttng_domain **domains)
3032 {
3033 int ret, index = 0;
3034 ssize_t nb_dom = 0;
3035
3036 if (session->kernel_session != NULL) {
3037 DBG3("Listing domains found kernel domain");
3038 nb_dom++;
3039 }
3040
3041 if (session->ust_session != NULL) {
3042 DBG3("Listing domains found UST global domain");
3043 nb_dom++;
3044 }
3045
3046 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3047 if (*domains == NULL) {
3048 ret = -LTTCOMM_FATAL;
3049 goto error;
3050 }
3051
3052 if (session->kernel_session != NULL) {
3053 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3054 index++;
3055 }
3056
3057 if (session->ust_session != NULL) {
3058 (*domains)[index].type = LTTNG_DOMAIN_UST;
3059 index++;
3060 }
3061
3062 return nb_dom;
3063
3064 error:
3065 return ret;
3066 }
3067
3068 /*
3069 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3070 */
3071 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3072 struct lttng_channel **channels)
3073 {
3074 int ret;
3075 ssize_t nb_chan = 0;
3076
3077 switch (domain) {
3078 case LTTNG_DOMAIN_KERNEL:
3079 if (session->kernel_session != NULL) {
3080 nb_chan = session->kernel_session->channel_count;
3081 }
3082 DBG3("Number of kernel channels %zd", nb_chan);
3083 break;
3084 case LTTNG_DOMAIN_UST:
3085 if (session->ust_session != NULL) {
3086 nb_chan = lttng_ht_get_count(
3087 session->ust_session->domain_global.channels);
3088 }
3089 DBG3("Number of UST global channels %zd", nb_chan);
3090 break;
3091 default:
3092 *channels = NULL;
3093 ret = -LTTCOMM_UND;
3094 goto error;
3095 }
3096
3097 if (nb_chan > 0) {
3098 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3099 if (*channels == NULL) {
3100 ret = -LTTCOMM_FATAL;
3101 goto error;
3102 }
3103
3104 list_lttng_channels(domain, session, *channels);
3105 } else {
3106 *channels = NULL;
3107 }
3108
3109 return nb_chan;
3110
3111 error:
3112 return ret;
3113 }
3114
3115 /*
3116 * Command LTTNG_LIST_EVENTS processed by the client thread.
3117 */
3118 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3119 char *channel_name, struct lttng_event **events)
3120 {
3121 int ret = 0;
3122 ssize_t nb_event = 0;
3123
3124 switch (domain) {
3125 case LTTNG_DOMAIN_KERNEL:
3126 if (session->kernel_session != NULL) {
3127 nb_event = list_lttng_kernel_events(channel_name,
3128 session->kernel_session, events);
3129 }
3130 break;
3131 case LTTNG_DOMAIN_UST:
3132 {
3133 if (session->ust_session != NULL) {
3134 nb_event = list_lttng_ust_global_events(channel_name,
3135 &session->ust_session->domain_global, events);
3136 }
3137 break;
3138 }
3139 default:
3140 ret = -LTTCOMM_UND;
3141 goto error;
3142 }
3143
3144 ret = nb_event;
3145
3146 error:
3147 return ret;
3148 }
3149
3150 /*
3151 * Process the command requested by the lttng client within the command
3152 * context structure. This function make sure that the return structure (llm)
3153 * is set and ready for transmission before returning.
3154 *
3155 * Return any error encountered or 0 for success.
3156 */
3157 static int process_client_msg(struct command_ctx *cmd_ctx)
3158 {
3159 int ret = LTTCOMM_OK;
3160 int need_tracing_session = 1;
3161 int need_domain;
3162
3163 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3164
3165 switch (cmd_ctx->lsm->cmd_type) {
3166 case LTTNG_CREATE_SESSION:
3167 case LTTNG_DESTROY_SESSION:
3168 case LTTNG_LIST_SESSIONS:
3169 case LTTNG_LIST_DOMAINS:
3170 case LTTNG_START_TRACE:
3171 case LTTNG_STOP_TRACE:
3172 need_domain = 0;
3173 break;
3174 default:
3175 need_domain = 1;
3176 }
3177
3178 if (opt_no_kernel && need_domain
3179 && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3180 if (!is_root) {
3181 ret = LTTCOMM_NEED_ROOT_SESSIOND;
3182 } else {
3183 ret = LTTCOMM_KERN_NA;
3184 }
3185 goto error;
3186 }
3187
3188 /*
3189 * Check for command that don't needs to allocate a returned payload. We do
3190 * this here so we don't have to make the call for no payload at each
3191 * command.
3192 */
3193 switch(cmd_ctx->lsm->cmd_type) {
3194 case LTTNG_LIST_SESSIONS:
3195 case LTTNG_LIST_TRACEPOINTS:
3196 case LTTNG_LIST_TRACEPOINT_FIELDS:
3197 case LTTNG_LIST_DOMAINS:
3198 case LTTNG_LIST_CHANNELS:
3199 case LTTNG_LIST_EVENTS:
3200 break;
3201 default:
3202 /* Setup lttng message with no payload */
3203 ret = setup_lttng_msg(cmd_ctx, 0);
3204 if (ret < 0) {
3205 /* This label does not try to unlock the session */
3206 goto init_setup_error;
3207 }
3208 }
3209
3210 /* Commands that DO NOT need a session. */
3211 switch (cmd_ctx->lsm->cmd_type) {
3212 case LTTNG_CREATE_SESSION:
3213 case LTTNG_CALIBRATE:
3214 case LTTNG_LIST_SESSIONS:
3215 case LTTNG_LIST_TRACEPOINTS:
3216 case LTTNG_LIST_TRACEPOINT_FIELDS:
3217 need_tracing_session = 0;
3218 break;
3219 default:
3220 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3221 /*
3222 * We keep the session list lock across _all_ commands
3223 * for now, because the per-session lock does not
3224 * handle teardown properly.
3225 */
3226 session_lock_list();
3227 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3228 if (cmd_ctx->session == NULL) {
3229 if (cmd_ctx->lsm->session.name != NULL) {
3230 ret = LTTCOMM_SESS_NOT_FOUND;
3231 } else {
3232 /* If no session name specified */
3233 ret = LTTCOMM_SELECT_SESS;
3234 }
3235 goto error;
3236 } else {
3237 /* Acquire lock for the session */
3238 session_lock(cmd_ctx->session);
3239 }
3240 break;
3241 }
3242
3243 if (!need_domain) {
3244 goto skip_domain;
3245 }
3246 /*
3247 * Check domain type for specific "pre-action".
3248 */
3249 switch (cmd_ctx->lsm->domain.type) {
3250 case LTTNG_DOMAIN_KERNEL:
3251 if (!is_root) {
3252 ret = LTTCOMM_NEED_ROOT_SESSIOND;
3253 goto error;
3254 }
3255
3256 /* Kernel tracer check */
3257 if (kernel_tracer_fd == -1) {
3258 /* Basically, load kernel tracer modules */
3259 ret = init_kernel_tracer();
3260 if (ret != 0) {
3261 goto error;
3262 }
3263 }
3264
3265 /* Consumer is in an ERROR state. Report back to client */
3266 if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) {
3267 ret = LTTCOMM_NO_KERNCONSUMERD;
3268 goto error;
3269 }
3270
3271 /* Need a session for kernel command */
3272 if (need_tracing_session) {
3273 if (cmd_ctx->session->kernel_session == NULL) {
3274 ret = create_kernel_session(cmd_ctx->session);
3275 if (ret < 0) {
3276 ret = LTTCOMM_KERN_SESS_FAIL;
3277 goto error;
3278 }
3279 }
3280
3281 /* Start the kernel consumer daemon */
3282 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3283 if (kconsumer_data.pid == 0 &&
3284 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3285 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3286 ret = start_consumerd(&kconsumer_data);
3287 if (ret < 0) {
3288 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3289 goto error;
3290 }
3291 uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED);
3292 } else {
3293 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3294 }
3295 }
3296
3297 break;
3298 case LTTNG_DOMAIN_UST:
3299 {
3300 /* Consumer is in an ERROR state. Report back to client */
3301 if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) {
3302 ret = LTTCOMM_NO_USTCONSUMERD;
3303 goto error;
3304 }
3305
3306 if (need_tracing_session) {
3307 if (cmd_ctx->session->ust_session == NULL) {
3308 ret = create_ust_session(cmd_ctx->session,
3309 &cmd_ctx->lsm->domain);
3310 if (ret != LTTCOMM_OK) {
3311 goto error;
3312 }
3313 }
3314 /* Start the UST consumer daemons */
3315 /* 64-bit */
3316 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3317 if (consumerd64_bin[0] != '\0' &&
3318 ustconsumer64_data.pid == 0 &&
3319 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3320 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3321 ret = start_consumerd(&ustconsumer64_data);
3322 if (ret < 0) {
3323 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3324 ust_consumerd64_fd = -EINVAL;
3325 goto error;
3326 }
3327
3328 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3329 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3330 } else {
3331 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3332 }
3333 /* 32-bit */
3334 if (consumerd32_bin[0] != '\0' &&
3335 ustconsumer32_data.pid == 0 &&
3336 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3337 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3338 ret = start_consumerd(&ustconsumer32_data);
3339 if (ret < 0) {
3340 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3341 ust_consumerd32_fd = -EINVAL;
3342 goto error;
3343 }
3344
3345 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3346 uatomic_set(&ust_consumerd_state, CONSUMER_STARTED);
3347 } else {
3348 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3349 }
3350 }
3351 break;
3352 }
3353 default:
3354 break;
3355 }
3356 skip_domain:
3357
3358 /* Validate consumer daemon state when start/stop trace command */
3359 if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE ||
3360 cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) {
3361 switch (cmd_ctx->lsm->domain.type) {
3362 case LTTNG_DOMAIN_UST:
3363 if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) {
3364 ret = LTTCOMM_NO_USTCONSUMERD;
3365 goto error;
3366 }
3367 break;
3368 case LTTNG_DOMAIN_KERNEL:
3369 if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) {
3370 ret = LTTCOMM_NO_KERNCONSUMERD;
3371 goto error;
3372 }
3373 break;
3374 }
3375 }
3376
3377 /*
3378 * Check that the UID or GID match that of the tracing session.
3379 * The root user can interact with all sessions.
3380 */
3381 if (need_tracing_session) {
3382 if (!session_access_ok(cmd_ctx->session,
3383 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3384 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds))) {
3385 ret = LTTCOMM_EPERM;
3386 goto error;
3387 }
3388 }
3389
3390 /* Process by command type */
3391 switch (cmd_ctx->lsm->cmd_type) {
3392 case LTTNG_ADD_CONTEXT:
3393 {
3394 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3395 cmd_ctx->lsm->u.context.channel_name,
3396 cmd_ctx->lsm->u.context.event_name,
3397 &cmd_ctx->lsm->u.context.ctx);
3398 break;
3399 }
3400 case LTTNG_DISABLE_CHANNEL:
3401 {
3402 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3403 cmd_ctx->lsm->u.disable.channel_name);
3404 break;
3405 }
3406 case LTTNG_DISABLE_EVENT:
3407 {
3408 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3409 cmd_ctx->lsm->u.disable.channel_name,
3410 cmd_ctx->lsm->u.disable.name);
3411 break;
3412 }
3413 case LTTNG_DISABLE_ALL_EVENT:
3414 {
3415 DBG("Disabling all events");
3416
3417 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3418 cmd_ctx->lsm->u.disable.channel_name);
3419 break;
3420 }
3421 case LTTNG_ENABLE_CHANNEL:
3422 {
3423 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3424 &cmd_ctx->lsm->u.channel.chan);
3425 break;
3426 }
3427 case LTTNG_ENABLE_EVENT:
3428 {
3429 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3430 cmd_ctx->lsm->u.enable.channel_name,
3431 &cmd_ctx->lsm->u.enable.event);
3432 break;
3433 }
3434 case LTTNG_ENABLE_ALL_EVENT:
3435 {
3436 DBG("Enabling all events");
3437
3438 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3439 cmd_ctx->lsm->u.enable.channel_name,
3440 cmd_ctx->lsm->u.enable.event.type);
3441 break;
3442 }
3443 case LTTNG_LIST_TRACEPOINTS:
3444 {
3445 struct lttng_event *events;
3446 ssize_t nb_events;
3447
3448 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3449 if (nb_events < 0) {
3450 ret = -nb_events;
3451 goto error;
3452 }
3453
3454 /*
3455 * Setup lttng message with payload size set to the event list size in
3456 * bytes and then copy list into the llm payload.
3457 */
3458 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3459 if (ret < 0) {
3460 free(events);
3461 goto setup_error;
3462 }
3463
3464 /* Copy event list into message payload */
3465 memcpy(cmd_ctx->llm->payload, events,
3466 sizeof(struct lttng_event) * nb_events);
3467
3468 free(events);
3469
3470 ret = LTTCOMM_OK;
3471 break;
3472 }
3473 case LTTNG_LIST_TRACEPOINT_FIELDS:
3474 {
3475 struct lttng_event_field *fields;
3476 ssize_t nb_fields;
3477
3478 nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, &fields);
3479 if (nb_fields < 0) {
3480 ret = -nb_fields;
3481 goto error;
3482 }
3483
3484 /*
3485 * Setup lttng message with payload size set to the event list size in
3486 * bytes and then copy list into the llm payload.
3487 */
3488 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event_field) * nb_fields);
3489 if (ret < 0) {
3490 free(fields);
3491 goto setup_error;
3492 }
3493
3494 /* Copy event list into message payload */
3495 memcpy(cmd_ctx->llm->payload, fields,
3496 sizeof(struct lttng_event_field) * nb_fields);
3497
3498 free(fields);
3499
3500 ret = LTTCOMM_OK;
3501 break;
3502 }
3503
3504 case LTTNG_START_TRACE:
3505 {
3506 ret = cmd_start_trace(cmd_ctx->session);
3507 break;
3508 }
3509 case LTTNG_STOP_TRACE:
3510 {
3511 ret = cmd_stop_trace(cmd_ctx->session);
3512 break;
3513 }
3514 case LTTNG_CREATE_SESSION:
3515 {
3516 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3517 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3518 break;
3519 }
3520 case LTTNG_DESTROY_SESSION:
3521 {
3522 ret = cmd_destroy_session(cmd_ctx->session,
3523 cmd_ctx->lsm->session.name);
3524 /*
3525 * Set session to NULL so we do not unlock it after
3526 * free.
3527 */
3528 cmd_ctx->session = NULL;
3529 break;
3530 }
3531 case LTTNG_LIST_DOMAINS:
3532 {
3533 ssize_t nb_dom;
3534 struct lttng_domain *domains;
3535
3536 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3537 if (nb_dom < 0) {
3538 ret = -nb_dom;
3539 goto error;
3540 }
3541
3542 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3543 if (ret < 0) {
3544 goto setup_error;
3545 }
3546
3547 /* Copy event list into message payload */
3548 memcpy(cmd_ctx->llm->payload, domains,
3549 nb_dom * sizeof(struct lttng_domain));
3550
3551 free(domains);
3552
3553 ret = LTTCOMM_OK;
3554 break;
3555 }
3556 case LTTNG_LIST_CHANNELS:
3557 {
3558 int nb_chan;
3559 struct lttng_channel *channels;
3560
3561 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3562 cmd_ctx->session, &channels);
3563 if (nb_chan < 0) {
3564 ret = -nb_chan;
3565 goto error;
3566 }
3567
3568 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3569 if (ret < 0) {
3570 goto setup_error;
3571 }
3572
3573 /* Copy event list into message payload */
3574 memcpy(cmd_ctx->llm->payload, channels,
3575 nb_chan * sizeof(struct lttng_channel));
3576
3577 free(channels);
3578
3579 ret = LTTCOMM_OK;
3580 break;
3581 }
3582 case LTTNG_LIST_EVENTS:
3583 {
3584 ssize_t nb_event;
3585 struct lttng_event *events = NULL;
3586
3587 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3588 cmd_ctx->lsm->u.list.channel_name, &events);
3589 if (nb_event < 0) {
3590 ret = -nb_event;
3591 goto error;
3592 }
3593
3594 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3595 if (ret < 0) {
3596 goto setup_error;
3597 }
3598
3599 /* Copy event list into message payload */
3600 memcpy(cmd_ctx->llm->payload, events,
3601 nb_event * sizeof(struct lttng_event));
3602
3603 free(events);
3604
3605 ret = LTTCOMM_OK;
3606 break;
3607 }
3608 case LTTNG_LIST_SESSIONS:
3609 {
3610 unsigned int nr_sessions;
3611
3612 session_lock_list();
3613 nr_sessions = lttng_sessions_count(
3614 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3615 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3616
3617 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3618 if (ret < 0) {
3619 session_unlock_list();
3620 goto setup_error;
3621 }
3622
3623 /* Filled the session array */
3624 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3625 LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds),
3626 LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds));
3627
3628 session_unlock_list();
3629
3630 ret = LTTCOMM_OK;
3631 break;
3632 }
3633 case LTTNG_CALIBRATE:
3634 {
3635 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3636 &cmd_ctx->lsm->u.calibrate);
3637 break;
3638 }
3639 case LTTNG_REGISTER_CONSUMER:
3640 {
3641 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3642 cmd_ctx->lsm->u.reg.path);
3643 break;
3644 }
3645 default:
3646 ret = LTTCOMM_UND;
3647 break;
3648 }
3649
3650 error:
3651 if (cmd_ctx->llm == NULL) {
3652 DBG("Missing llm structure. Allocating one.");
3653 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3654 goto setup_error;
3655 }
3656 }
3657 /* Set return code */
3658 cmd_ctx->llm->ret_code = ret;
3659 setup_error:
3660 if (cmd_ctx->session) {
3661 session_unlock(cmd_ctx->session);
3662 }
3663 if (need_tracing_session) {
3664 session_unlock_list();
3665 }
3666 init_setup_error:
3667 return ret;
3668 }
3669
3670 /*
3671 * This thread manage all clients request using the unix client socket for
3672 * communication.
3673 */
3674 static void *thread_manage_clients(void *data)
3675 {
3676 int sock = -1, ret, i, pollfd;
3677 uint32_t revents, nb_fd;
3678 struct command_ctx *cmd_ctx = NULL;
3679 struct lttng_poll_event events;
3680
3681 DBG("[thread] Manage client started");
3682
3683 rcu_register_thread();
3684
3685 ret = lttcomm_listen_unix_sock(client_sock);
3686 if (ret < 0) {
3687 goto error;
3688 }
3689
3690 /*
3691 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3692 * more will be added to this poll set.
3693 */
3694 ret = create_thread_poll_set(&events, 2);
3695 if (ret < 0) {
3696 goto error;
3697 }
3698
3699 /* Add the application registration socket */
3700 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3701 if (ret < 0) {
3702 goto error;
3703 }
3704
3705 /*
3706 * Notify parent pid that we are ready to accept command for client side.
3707 */
3708 if (opt_sig_parent) {
3709 kill(ppid, SIGUSR1);
3710 }
3711
3712 while (1) {
3713 DBG("Accepting client command ...");
3714
3715 nb_fd = LTTNG_POLL_GETNB(&events);
3716
3717 /* Inifinite blocking call, waiting for transmission */
3718 restart:
3719 ret = lttng_poll_wait(&events, -1);
3720 if (ret < 0) {
3721 /*
3722 * Restart interrupted system call.
3723 */
3724 if (errno == EINTR) {
3725 goto restart;
3726 }
3727 goto error;
3728 }
3729
3730 for (i = 0; i < nb_fd; i++) {
3731 /* Fetch once the poll data */
3732 revents = LTTNG_POLL_GETEV(&events, i);
3733 pollfd = LTTNG_POLL_GETFD(&events, i);
3734
3735 /* Thread quit pipe has been closed. Killing thread. */
3736 ret = check_thread_quit_pipe(pollfd, revents);
3737 if (ret) {
3738 goto error;
3739 }
3740
3741 /* Event on the registration socket */
3742 if (pollfd == client_sock) {
3743 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3744 ERR("Client socket poll error");
3745 goto error;
3746 }
3747 }
3748 }
3749
3750 DBG("Wait for client response");
3751
3752 sock = lttcomm_accept_unix_sock(client_sock);
3753 if (sock < 0) {
3754 goto error;
3755 }
3756
3757 /* Set socket option for credentials retrieval */
3758 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3759 if (ret < 0) {
3760 goto error;
3761 }
3762
3763 /* Allocate context command to process the client request */
3764 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3765 if (cmd_ctx == NULL) {
3766 PERROR("zmalloc cmd_ctx");
3767 goto error;
3768 }
3769
3770 /* Allocate data buffer for reception */
3771 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3772 if (cmd_ctx->lsm == NULL) {
3773 PERROR("zmalloc cmd_ctx->lsm");
3774 goto error;
3775 }
3776
3777 cmd_ctx->llm = NULL;
3778 cmd_ctx->session = NULL;
3779
3780 /*
3781 * Data is received from the lttng client. The struct
3782 * lttcomm_session_msg (lsm) contains the command and data request of
3783 * the client.
3784 */
3785 DBG("Receiving data from client ...");
3786 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3787 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3788 if (ret <= 0) {
3789 DBG("Nothing recv() from client... continuing");
3790 ret = close(sock);
3791 if (ret) {
3792 PERROR("close");
3793 }
3794 sock = -1;
3795 clean_command_ctx(&cmd_ctx);
3796 continue;
3797 }
3798
3799 // TODO: Validate cmd_ctx including sanity check for
3800 // security purpose.
3801
3802 rcu_thread_online();
3803 /*
3804 * This function dispatch the work to the kernel or userspace tracer
3805 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3806 * informations for the client. The command context struct contains
3807 * everything this function may needs.
3808 */
3809 ret = process_client_msg(cmd_ctx);
3810 rcu_thread_offline();
3811 if (ret < 0) {
3812 /*
3813 * TODO: Inform client somehow of the fatal error. At
3814 * this point, ret < 0 means that a zmalloc failed
3815 * (ENOMEM). Error detected but still accept command.
3816 */
3817 clean_command_ctx(&cmd_ctx);
3818 continue;
3819 }
3820
3821 DBG("Sending response (size: %d, retcode: %s)",
3822 cmd_ctx->lttng_msg_size,
3823 lttng_strerror(-cmd_ctx->llm->ret_code));
3824 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3825 if (ret < 0) {
3826 ERR("Failed to send data back to client");
3827 }
3828
3829 /* End of transmission */
3830 ret = close(sock);
3831 if (ret) {
3832 PERROR("close");
3833 }
3834 sock = -1;
3835
3836 clean_command_ctx(&cmd_ctx);
3837 }
3838
3839 error:
3840 DBG("Client thread dying");
3841 unlink(client_unix_sock_path);
3842 if (client_sock >= 0) {
3843 ret = close(client_sock);
3844 if (ret) {
3845 PERROR("close");
3846 }
3847 }
3848 if (sock >= 0) {
3849 ret = close(sock);
3850 if (ret) {
3851 PERROR("close");
3852 }
3853 }
3854
3855 lttng_poll_clean(&events);
3856 clean_command_ctx(&cmd_ctx);
3857
3858 rcu_unregister_thread();
3859 return NULL;
3860 }
3861
3862
3863 /*
3864 * usage function on stderr
3865 */
3866 static void usage(void)
3867 {
3868 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3869 fprintf(stderr, " -h, --help Display this usage.\n");
3870 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3871 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3872 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3873 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3874 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3875 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3876 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3877 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3878 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3879 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3880 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3881 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3882 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3883 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3884 fprintf(stderr, " -V, --version Show version number.\n");
3885 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3886 fprintf(stderr, " -q, --quiet No output at all.\n");
3887 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3888 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3889 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3890 }
3891
3892 /*
3893 * daemon argument parsing
3894 */
3895 static int parse_args(int argc, char **argv)
3896 {
3897 int c;
3898
3899 static struct option long_options[] = {
3900 { "client-sock", 1, 0, 'c' },
3901 { "apps-sock", 1, 0, 'a' },
3902 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3903 { "kconsumerd-err-sock", 1, 0, 'E' },
3904 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3905 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3906 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3907 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3908 { "consumerd32-path", 1, 0, 'u' },
3909 { "consumerd32-libdir", 1, 0, 'U' },
3910 { "consumerd64-path", 1, 0, 't' },
3911 { "consumerd64-libdir", 1, 0, 'T' },
3912 { "daemonize", 0, 0, 'd' },
3913 { "sig-parent", 0, 0, 'S' },
3914 { "help", 0, 0, 'h' },
3915 { "group", 1, 0, 'g' },
3916 { "version", 0, 0, 'V' },
3917 { "quiet", 0, 0, 'q' },
3918 { "verbose", 0, 0, 'v' },
3919 { "verbose-consumer", 0, 0, 'Z' },
3920 { "no-kernel", 0, 0, 'N' },
3921 { NULL, 0, 0, 0 }
3922 };
3923
3924 while (1) {
3925 int option_index = 0;
3926 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3927 long_options, &option_index);
3928 if (c == -1) {
3929 break;
3930 }
3931
3932 switch (c) {
3933 case 0:
3934 fprintf(stderr, "option %s", long_options[option_index].name);
3935 if (optarg) {
3936 fprintf(stderr, " with arg %s\n", optarg);
3937 }
3938 break;
3939 case 'c':
3940 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3941 break;
3942 case 'a':
3943 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3944 break;
3945 case 'd':
3946 opt_daemon = 1;
3947 break;
3948 case 'g':
3949 opt_tracing_group = optarg;
3950 break;
3951 case 'h':
3952 usage();
3953 exit(EXIT_FAILURE);
3954 case 'V':
3955 fprintf(stdout, "%s\n", VERSION);
3956 exit(EXIT_SUCCESS);
3957 case 'S':
3958 opt_sig_parent = 1;
3959 break;
3960 case 'E':
3961 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3962 break;
3963 case 'C':
3964 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3965 break;
3966 case 'F':
3967 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3968 break;
3969 case 'D':
3970 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3971 break;
3972 case 'H':
3973 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3974 break;
3975 case 'G':
3976 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3977 break;
3978 case 'N':
3979 opt_no_kernel = 1;
3980 break;
3981 case 'q':
3982 lttng_opt_quiet = 1;
3983 break;
3984 case 'v':
3985 /* Verbose level can increase using multiple -v */
3986 lttng_opt_verbose += 1;
3987 break;
3988 case 'Z':
3989 opt_verbose_consumer += 1;
3990 break;
3991 case 'u':
3992 consumerd32_bin= optarg;
3993 break;
3994 case 'U':
3995 consumerd32_libdir = optarg;
3996 break;
3997 case 't':
3998 consumerd64_bin = optarg;
3999 break;
4000 case 'T':
4001 consumerd64_libdir = optarg;
4002 break;
4003 default:
4004 /* Unknown option or other error.
4005 * Error is printed by getopt, just return */
4006 return -1;
4007 }
4008 }
4009
4010 return 0;
4011 }
4012
4013 /*
4014 * Creates the two needed socket by the daemon.
4015 * apps_sock - The communication socket for all UST apps.
4016 * client_sock - The communication of the cli tool (lttng).
4017 */
4018 static int init_daemon_socket(void)
4019 {
4020 int ret = 0;
4021 mode_t old_umask;
4022
4023 old_umask = umask(0);
4024
4025 /* Create client tool unix socket */
4026 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
4027 if (client_sock < 0) {
4028 ERR("Create unix sock failed: %s", client_unix_sock_path);
4029 ret = -1;
4030 goto end;
4031 }
4032
4033 /* File permission MUST be 660 */
4034 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4035 if (ret < 0) {
4036 ERR("Set file permissions failed: %s", client_unix_sock_path);
4037 PERROR("chmod");
4038 goto end;
4039 }
4040
4041 /* Create the application unix socket */
4042 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
4043 if (apps_sock < 0) {
4044 ERR("Create unix sock failed: %s", apps_unix_sock_path);
4045 ret = -1;
4046 goto end;
4047 }
4048
4049 /* File permission MUST be 666 */
4050 ret = chmod(apps_unix_sock_path,
4051 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
4052 if (ret < 0) {
4053 ERR("Set file permissions failed: %s", apps_unix_sock_path);
4054 PERROR("chmod");
4055 goto end;
4056 }
4057
4058 end:
4059 umask(old_umask);
4060 return ret;
4061 }
4062
4063 /*
4064 * Check if the global socket is available, and if a daemon is answering at the
4065 * other side. If yes, error is returned.
4066 */
4067 static int check_existing_daemon(void)
4068 {
4069 /* Is there anybody out there ? */
4070 if (lttng_session_daemon_alive()) {
4071 return -EEXIST;
4072 }
4073
4074 return 0;
4075 }
4076
4077 /*
4078 * Set the tracing group gid onto the client socket.
4079 *
4080 * Race window between mkdir and chown is OK because we are going from more
4081 * permissive (root.root) to less permissive (root.tracing).
4082 */
4083 static int set_permissions(char *rundir)
4084 {
4085 int ret;
4086 gid_t gid;
4087
4088 ret = allowed_group();
4089 if (ret < 0) {
4090 WARN("No tracing group detected");
4091 ret = 0;
4092 goto end;
4093 }
4094
4095 gid = ret;
4096
4097 /* Set lttng run dir */
4098 ret = chown(rundir, 0, gid);
4099 if (ret < 0) {
4100 ERR("Unable to set group on %s", rundir);
4101 PERROR("chown");
4102 }
4103
4104 /* Ensure tracing group can search the run dir */
4105 ret = chmod(rundir, S_IRWXU | S_IXGRP | S_IXOTH);
4106 if (ret < 0) {
4107 ERR("Unable to set permissions on %s", rundir);
4108 PERROR("chmod");
4109 }
4110
4111 /* lttng client socket path */
4112 ret = chown(client_unix_sock_path, 0, gid);
4113 if (ret < 0) {
4114 ERR("Unable to set group on %s", client_unix_sock_path);
4115 PERROR("chown");
4116 }
4117
4118 /* kconsumer error socket path */
4119 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4120 if (ret < 0) {
4121 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4122 PERROR("chown");
4123 }
4124
4125 /* 64-bit ustconsumer error socket path */
4126 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4127 if (ret < 0) {
4128 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4129 PERROR("chown");
4130 }
4131
4132 /* 32-bit ustconsumer compat32 error socket path */
4133 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4134 if (ret < 0) {
4135 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4136 PERROR("chown");
4137 }
4138
4139 DBG("All permissions are set");
4140
4141 end:
4142 return ret;
4143 }
4144
4145 /*
4146 * Create the lttng run directory needed for all global sockets and pipe.
4147 */
4148 static int create_lttng_rundir(const char *rundir)
4149 {
4150 int ret;
4151
4152 DBG3("Creating LTTng run directory: %s", rundir);
4153
4154 ret = mkdir(rundir, S_IRWXU);
4155 if (ret < 0) {
4156 if (errno != EEXIST) {
4157 ERR("Unable to create %s", rundir);
4158 goto error;
4159 } else {
4160 ret = 0;
4161 }
4162 }
4163
4164 error:
4165 return ret;
4166 }
4167
4168 /*
4169 * Setup sockets and directory needed by the kconsumerd communication with the
4170 * session daemon.
4171 */
4172 static int set_consumer_sockets(struct consumer_data *consumer_data,
4173 const char *rundir)
4174 {
4175 int ret;
4176 char path[PATH_MAX];
4177
4178 switch (consumer_data->type) {
4179 case LTTNG_CONSUMER_KERNEL:
4180 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4181 break;
4182 case LTTNG_CONSUMER64_UST:
4183 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4184 break;
4185 case LTTNG_CONSUMER32_UST:
4186 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4187 break;
4188 default:
4189 ERR("Consumer type unknown");
4190 ret = -EINVAL;
4191 goto error;
4192 }
4193
4194 DBG2("Creating consumer directory: %s", path);
4195
4196 ret = mkdir(path, S_IRWXU);
4197 if (ret < 0) {
4198 if (errno != EEXIST) {
4199 PERROR("mkdir");
4200 ERR("Failed to create %s", path);
4201 goto error;
4202 }
4203 ret = -1;
4204 }
4205
4206 /* Create the kconsumerd error unix socket */
4207 consumer_data->err_sock =
4208 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4209 if (consumer_data->err_sock < 0) {
4210 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4211 ret = -1;
4212 goto error;
4213 }
4214
4215 /* File permission MUST be 660 */
4216 ret = chmod(consumer_data->err_unix_sock_path,
4217 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4218 if (ret < 0) {
4219 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4220 PERROR("chmod");
4221 goto error;
4222 }
4223
4224 error:
4225 return ret;
4226 }
4227
4228 /*
4229 * Signal handler for the daemon
4230 *
4231 * Simply stop all worker threads, leaving main() return gracefully after
4232 * joining all threads and calling cleanup().
4233 */
4234 static void sighandler(int sig)
4235 {
4236 switch (sig) {
4237 case SIGPIPE:
4238 DBG("SIGPIPE caught");
4239 return;
4240 case SIGINT:
4241 DBG("SIGINT caught");
4242 stop_threads();
4243 break;
4244 case SIGTERM:
4245 DBG("SIGTERM caught");
4246 stop_threads();
4247 break;
4248 default:
4249 break;
4250 }
4251 }
4252
4253 /*
4254 * Setup signal handler for :
4255 * SIGINT, SIGTERM, SIGPIPE
4256 */
4257 static int set_signal_handler(void)
4258 {
4259 int ret = 0;
4260 struct sigaction sa;
4261 sigset_t sigset;
4262
4263 if ((ret = sigemptyset(&sigset)) < 0) {
4264 PERROR("sigemptyset");
4265 return ret;
4266 }
4267
4268 sa.sa_handler = sighandler;
4269 sa.sa_mask = sigset;
4270 sa.sa_flags = 0;
4271 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4272 PERROR("sigaction");
4273 return ret;
4274 }
4275
4276 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4277 PERROR("sigaction");
4278 return ret;
4279 }
4280
4281 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4282 PERROR("sigaction");
4283 return ret;
4284 }
4285
4286 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4287
4288 return ret;
4289 }
4290
4291 /*
4292 * Set open files limit to unlimited. This daemon can open a large number of
4293 * file descriptors in order to consumer multiple kernel traces.
4294 */
4295 static void set_ulimit(void)
4296 {
4297 int ret;
4298 struct rlimit lim;
4299
4300 /* The kernel does not allowed an infinite limit for open files */
4301 lim.rlim_cur = 65535;
4302 lim.rlim_max = 65535;
4303
4304 ret = setrlimit(RLIMIT_NOFILE, &lim);
4305 if (ret < 0) {
4306 PERROR("failed to set open files limit");
4307 }
4308 }
4309
4310 /*
4311 * main
4312 */
4313 int main(int argc, char **argv)
4314 {
4315 int ret = 0;
4316 void *status;
4317 const char *home_path;
4318
4319 init_kernel_workarounds();
4320
4321 rcu_register_thread();
4322
4323 setup_consumerd_path();
4324
4325 /* Parse arguments */
4326 progname = argv[0];
4327 if ((ret = parse_args(argc, argv) < 0)) {
4328 goto error;
4329 }
4330
4331 /* Daemonize */
4332 if (opt_daemon) {
4333 int i;
4334
4335 /*
4336 * fork
4337 * child: setsid, close FD 0, 1, 2, chdir /
4338 * parent: exit (if fork is successful)
4339 */
4340 ret = daemon(0, 0);
4341 if (ret < 0) {
4342 PERROR("daemon");
4343 goto error;
4344 }
4345 /*
4346 * We are in the child. Make sure all other file
4347 * descriptors are closed, in case we are called with
4348 * more opened file descriptors than the standard ones.
4349 */
4350 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
4351 (void) close(i);
4352 }
4353 }
4354
4355 /* Create thread quit pipe */
4356 if ((ret = init_thread_quit_pipe()) < 0) {
4357 goto error;
4358 }
4359
4360 /* Check if daemon is UID = 0 */
4361 is_root = !getuid();
4362
4363 if (is_root) {
4364 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4365
4366 /* Create global run dir with root access */
4367 ret = create_lttng_rundir(rundir);
4368 if (ret < 0) {
4369 goto error;
4370 }
4371
4372 if (strlen(apps_unix_sock_path) == 0) {
4373 snprintf(apps_unix_sock_path, PATH_MAX,
4374 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4375 }
4376
4377 if (strlen(client_unix_sock_path) == 0) {
4378 snprintf(client_unix_sock_path, PATH_MAX,
4379 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4380 }
4381
4382 /* Set global SHM for ust */
4383 if (strlen(wait_shm_path) == 0) {
4384 snprintf(wait_shm_path, PATH_MAX,
4385 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4386 }
4387
4388 /* Setup kernel consumerd path */
4389 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4390 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4391 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4392 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4393
4394 DBG2("Kernel consumer err path: %s",
4395 kconsumer_data.err_unix_sock_path);
4396 DBG2("Kernel consumer cmd path: %s",
4397 kconsumer_data.cmd_unix_sock_path);
4398 } else {
4399 home_path = get_home_dir();
4400 if (home_path == NULL) {
4401 /* TODO: Add --socket PATH option */
4402 ERR("Can't get HOME directory for sockets creation.");
4403 ret = -EPERM;
4404 goto error;
4405 }
4406
4407 /*
4408 * Create rundir from home path. This will create something like
4409 * $HOME/.lttng
4410 */
4411 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4412 if (ret < 0) {
4413 ret = -ENOMEM;
4414 goto error;
4415 }
4416
4417 ret = create_lttng_rundir(rundir);
4418 if (ret < 0) {
4419 goto error;
4420 }
4421
4422 if (strlen(apps_unix_sock_path) == 0) {
4423 snprintf(apps_unix_sock_path, PATH_MAX,
4424 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4425 }
4426
4427 /* Set the cli tool unix socket path */
4428 if (strlen(client_unix_sock_path) == 0) {
4429 snprintf(client_unix_sock_path, PATH_MAX,
4430 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4431 }
4432
4433 /* Set global SHM for ust */
4434 if (strlen(wait_shm_path) == 0) {
4435 snprintf(wait_shm_path, PATH_MAX,
4436 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4437 }
4438 }
4439
4440 /* Set consumer initial state */
4441 kernel_consumerd_state = CONSUMER_STOPPED;
4442 ust_consumerd_state = CONSUMER_STOPPED;
4443
4444 DBG("Client socket path %s", client_unix_sock_path);
4445 DBG("Application socket path %s", apps_unix_sock_path);
4446 DBG("LTTng run directory path: %s", rundir);
4447
4448 /* 32 bits consumerd path setup */
4449 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4450 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4451 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4452 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4453
4454 DBG2("UST consumer 32 bits err path: %s",
4455 ustconsumer32_data.err_unix_sock_path);
4456 DBG2("UST consumer 32 bits cmd path: %s",
4457 ustconsumer32_data.cmd_unix_sock_path);
4458
4459 /* 64 bits consumerd path setup */
4460 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4461 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4462 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4463 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4464
4465 DBG2("UST consumer 64 bits err path: %s",
4466 ustconsumer64_data.err_unix_sock_path);
4467 DBG2("UST consumer 64 bits cmd path: %s",
4468 ustconsumer64_data.cmd_unix_sock_path);
4469
4470 /*
4471 * See if daemon already exist.
4472 */
4473 if ((ret = check_existing_daemon()) < 0) {
4474 ERR("Already running daemon.\n");
4475 /*
4476 * We do not goto exit because we must not cleanup()
4477 * because a daemon is already running.
4478 */
4479 goto error;
4480 }
4481
4482 /*
4483 * Init UST app hash table. Alloc hash table before this point since
4484 * cleanup() can get called after that point.
4485 */
4486 ust_app_ht_alloc();
4487
4488 /* After this point, we can safely call cleanup() with "goto exit" */
4489
4490 /*
4491 * These actions must be executed as root. We do that *after* setting up
4492 * the sockets path because we MUST make the check for another daemon using
4493 * those paths *before* trying to set the kernel consumer sockets and init
4494 * kernel tracer.
4495 */
4496 if (is_root) {
4497 ret = set_consumer_sockets(&kconsumer_data, rundir);
4498 if (ret < 0) {
4499 goto exit;
4500 }
4501
4502 /* Setup kernel tracer */
4503 if (!opt_no_kernel) {
4504 init_kernel_tracer();
4505 }
4506
4507 /* Set ulimit for open files */
4508 set_ulimit();
4509 }
4510 /* init lttng_fd tracking must be done after set_ulimit. */
4511 lttng_fd_init();
4512
4513 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4514 if (ret < 0) {
4515 goto exit;
4516 }
4517
4518 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4519 if (ret < 0) {
4520 goto exit;
4521 }
4522
4523 if ((ret = set_signal_handler()) < 0) {
4524 goto exit;
4525 }
4526
4527 /* Setup the needed unix socket */
4528 if ((ret = init_daemon_socket()) < 0) {
4529 goto exit;
4530 }
4531
4532 /* Set credentials to socket */
4533 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4534 goto exit;
4535 }
4536
4537 /* Get parent pid if -S, --sig-parent is specified. */
4538 if (opt_sig_parent) {
4539 ppid = getppid();
4540 }
4541
4542 /* Setup the kernel pipe for waking up the kernel thread */
4543 if ((ret = utils_create_pipe_cloexec(kernel_poll_pipe)) < 0) {
4544 goto exit;
4545 }
4546
4547 /* Setup the thread apps communication pipe. */
4548 if ((ret = utils_create_pipe_cloexec(apps_cmd_pipe)) < 0) {
4549 goto exit;
4550 }
4551
4552 /* Init UST command queue. */
4553 cds_wfq_init(&ust_cmd_queue.queue);
4554
4555 /*
4556 * Get session list pointer. This pointer MUST NOT be free(). This list is
4557 * statically declared in session.c
4558 */
4559 session_list_ptr = session_get_list();
4560
4561 /* Set up max poll set size */
4562 lttng_poll_set_max_size();
4563
4564 /* Create thread to manage the client socket */
4565 ret = pthread_create(&client_thread, NULL,
4566 thread_manage_clients, (void *) NULL);
4567 if (ret != 0) {
4568 PERROR("pthread_create clients");
4569 goto exit_client;
4570 }
4571
4572 /* Create thread to dispatch registration */
4573 ret = pthread_create(&dispatch_thread, NULL,
4574 thread_dispatch_ust_registration, (void *) NULL);
4575 if (ret != 0) {
4576 PERROR("pthread_create dispatch");
4577 goto exit_dispatch;
4578 }
4579
4580 /* Create thread to manage application registration. */
4581 ret = pthread_create(&reg_apps_thread, NULL,
4582 thread_registration_apps, (void *) NULL);
4583 if (ret != 0) {
4584 PERROR("pthread_create registration");
4585 goto exit_reg_apps;
4586 }
4587
4588 /* Create thread to manage application socket */
4589 ret = pthread_create(&apps_thread, NULL,
4590 thread_manage_apps, (void *) NULL);
4591 if (ret != 0) {
4592 PERROR("pthread_create apps");
4593 goto exit_apps;
4594 }
4595
4596 /* Create kernel thread to manage kernel event */
4597 ret = pthread_create(&kernel_thread, NULL,
4598 thread_manage_kernel, (void *) NULL);
4599 if (ret != 0) {
4600 PERROR("pthread_create kernel");
4601 goto exit_kernel;
4602 }
4603
4604 ret = pthread_join(kernel_thread, &status);
4605 if (ret != 0) {
4606 PERROR("pthread_join");
4607 goto error; /* join error, exit without cleanup */
4608 }
4609
4610 exit_kernel:
4611 ret = pthread_join(apps_thread, &status);
4612 if (ret != 0) {
4613 PERROR("pthread_join");
4614 goto error; /* join error, exit without cleanup */
4615 }
4616
4617 exit_apps:
4618 ret = pthread_join(reg_apps_thread, &status);
4619 if (ret != 0) {
4620 PERROR("pthread_join");
4621 goto error; /* join error, exit without cleanup */
4622 }
4623
4624 exit_reg_apps:
4625 ret = pthread_join(dispatch_thread, &status);
4626 if (ret != 0) {
4627 PERROR("pthread_join");
4628 goto error; /* join error, exit without cleanup */
4629 }
4630
4631 exit_dispatch:
4632 ret = pthread_join(client_thread, &status);
4633 if (ret != 0) {
4634 PERROR("pthread_join");
4635 goto error; /* join error, exit without cleanup */
4636 }
4637
4638 ret = join_consumer_thread(&kconsumer_data);
4639 if (ret != 0) {
4640 PERROR("join_consumer");
4641 goto error; /* join error, exit without cleanup */
4642 }
4643
4644 exit_client:
4645 exit:
4646 /*
4647 * cleanup() is called when no other thread is running.
4648 */
4649 rcu_thread_online();
4650 cleanup();
4651 rcu_thread_offline();
4652 rcu_unregister_thread();
4653 if (!ret) {
4654 exit(EXIT_SUCCESS);
4655 }
4656 error:
4657 exit(EXIT_FAILURE);
4658 }
LTTng 2.0 tools and control repository
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