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Merge branch 'master' into benchmark
[lttng-tools.git] / 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 it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <lttng-consumerd.h>
42 #include <lttng-sessiond-comm.h>
43 #include <lttng/lttng-consumer.h>
44
45 #include <lttngerr.h>
46
47 #include "channel.h"
48 #include "compat/poll.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "hashtable.h"
53 #include "kernel.h"
54 #include "lttng-sessiond.h"
55 #include "shm.h"
56 #include "ust-app.h"
57 #include "ust-ctl.h"
58 #include "utils.h"
59
60 #define CONSUMERD_FILE "lttng-consumerd"
61
62 struct consumer_data {
63 enum lttng_consumer_type type;
64
65 pthread_t thread; /* Worker thread interacting with the consumer */
66 sem_t sem;
67
68 /* Mutex to control consumerd pid assignation */
69 pthread_mutex_t pid_mutex;
70 pid_t pid;
71
72 int err_sock;
73 int cmd_sock;
74
75 /* consumer error and command Unix socket path */
76 char err_unix_sock_path[PATH_MAX];
77 char cmd_unix_sock_path[PATH_MAX];
78 };
79
80 #include "benchmark.h"
81
82 /* Const values */
83 const char default_home_dir[] = DEFAULT_HOME_DIR;
84 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
85 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
86 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
87
88 /* Variables */
89 int opt_verbose; /* Not static for lttngerr.h */
90 int opt_verbose_consumer; /* Not static for lttngerr.h */
91 int opt_quiet; /* Not static for lttngerr.h */
92
93 const char *progname;
94 const char *opt_tracing_group;
95 static int opt_sig_parent;
96 static int opt_daemon;
97 static int is_root; /* Set to 1 if the daemon is running as root */
98 static pid_t ppid; /* Parent PID for --sig-parent option */
99
100 /* Consumer daemon specific control data */
101 static struct consumer_data kconsumer_data = {
102 .type = LTTNG_CONSUMER_KERNEL,
103 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
104 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
105 };
106 static struct consumer_data ustconsumer64_data = {
107 .type = LTTNG_CONSUMER64_UST,
108 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
109 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
110 };
111 static struct consumer_data ustconsumer32_data = {
112 .type = LTTNG_CONSUMER32_UST,
113 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
114 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
115 };
116
117 static int dispatch_thread_exit;
118
119 /* Global application Unix socket path */
120 static char apps_unix_sock_path[PATH_MAX];
121 /* Global client Unix socket path */
122 static char client_unix_sock_path[PATH_MAX];
123 /* global wait shm path for UST */
124 static char wait_shm_path[PATH_MAX];
125
126 /* Sockets and FDs */
127 static int client_sock;
128 static int apps_sock;
129 static int kernel_tracer_fd;
130 static int kernel_poll_pipe[2];
131
132 /*
133 * Quit pipe for all threads. This permits a single cancellation point
134 * for all threads when receiving an event on the pipe.
135 */
136 static int thread_quit_pipe[2];
137
138 /*
139 * This pipe is used to inform the thread managing application communication
140 * that a command is queued and ready to be processed.
141 */
142 static int apps_cmd_pipe[2];
143
144 /* Pthread, Mutexes and Semaphores */
145 static pthread_t apps_thread;
146 static pthread_t reg_apps_thread;
147 static pthread_t client_thread;
148 static pthread_t kernel_thread;
149 static pthread_t dispatch_thread;
150
151
152 /*
153 * UST registration command queue. This queue is tied with a futex and uses a N
154 * wakers / 1 waiter implemented and detailed in futex.c/.h
155 *
156 * The thread_manage_apps and thread_dispatch_ust_registration interact with
157 * this queue and the wait/wake scheme.
158 */
159 static struct ust_cmd_queue ust_cmd_queue;
160
161 /*
162 * Pointer initialized before thread creation.
163 *
164 * This points to the tracing session list containing the session count and a
165 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
166 * MUST NOT be taken if you call a public function in session.c.
167 *
168 * The lock is nested inside the structure: session_list_ptr->lock. Please use
169 * session_lock_list and session_unlock_list for lock acquisition.
170 */
171 static struct ltt_session_list *session_list_ptr;
172
173 int ust_consumerd64_fd = -1;
174 int ust_consumerd32_fd = -1;
175
176 static const char *consumerd32_path =
177 __stringify(CONFIG_CONSUMERD32_PATH);
178 static const char *consumerd64_path =
179 __stringify(CONFIG_CONSUMERD64_PATH);
180 static const char *consumerd32_libdir =
181 __stringify(CONFIG_CONSUMERD32_LIBDIR);
182 static const char *consumerd64_libdir =
183 __stringify(CONFIG_CONSUMERD64_LIBDIR);
184
185 static
186 void setup_consumerd_path(void)
187 {
188 const char *path, *libdir;
189
190 /*
191 * Allow INSTALL_BIN_PATH to be used as a target path for the
192 * native architecture size consumer if CONFIG_CONSUMER*_PATH
193 * has not been defined.
194 */
195 #if (CAA_BITS_PER_LONG == 32)
196 if (!consumerd32_path[0]) {
197 consumerd32_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
198 }
199 if (!consumerd32_libdir[0]) {
200 consumerd32_libdir = INSTALL_LIB_PATH;
201 }
202 #elif (CAA_BITS_PER_LONG == 64)
203 if (!consumerd64_path[0]) {
204 consumerd64_path = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
205 }
206 if (!consumerd64_libdir[0]) {
207 consumerd64_libdir = INSTALL_LIB_PATH;
208 }
209 #else
210 #error "Unknown bitness"
211 #endif
212
213 /*
214 * runtime env. var. overrides the build default.
215 */
216 path = getenv("LTTNG_CONSUMERD32_PATH");
217 if (path) {
218 consumerd32_path = path;
219 }
220 path = getenv("LTTNG_CONSUMERD64_PATH");
221 if (path) {
222 consumerd64_path = path;
223 }
224 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
225 if (libdir) {
226 consumerd32_libdir = libdir;
227 }
228 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
229 if (libdir) {
230 consumerd64_libdir = libdir;
231 }
232 }
233
234 /*
235 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
236 */
237 static int create_thread_poll_set(struct lttng_poll_event *events,
238 unsigned int size)
239 {
240 int ret;
241
242 if (events == NULL || size == 0) {
243 ret = -1;
244 goto error;
245 }
246
247 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
248 if (ret < 0) {
249 goto error;
250 }
251
252 /* Add quit pipe */
253 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
254 if (ret < 0) {
255 goto error;
256 }
257
258 return 0;
259
260 error:
261 return ret;
262 }
263
264 /*
265 * Check if the thread quit pipe was triggered.
266 *
267 * Return 1 if it was triggered else 0;
268 */
269 static int check_thread_quit_pipe(int fd, uint32_t events)
270 {
271 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
272 return 1;
273 }
274
275 return 0;
276 }
277
278 /*
279 * Remove modules in reverse load order.
280 */
281 static int modprobe_remove_kernel_modules(void)
282 {
283 int ret = 0, i;
284 char modprobe[256];
285
286 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
287 ret = snprintf(modprobe, sizeof(modprobe),
288 "/sbin/modprobe -r -q %s",
289 kernel_modules_list[i].name);
290 if (ret < 0) {
291 perror("snprintf modprobe -r");
292 goto error;
293 }
294 modprobe[sizeof(modprobe) - 1] = '\0';
295 ret = system(modprobe);
296 if (ret == -1) {
297 ERR("Unable to launch modprobe -r for module %s",
298 kernel_modules_list[i].name);
299 } else if (kernel_modules_list[i].required
300 && WEXITSTATUS(ret) != 0) {
301 ERR("Unable to remove module %s",
302 kernel_modules_list[i].name);
303 } else {
304 DBG("Modprobe removal successful %s",
305 kernel_modules_list[i].name);
306 }
307 }
308
309 error:
310 return ret;
311 }
312
313 /*
314 * Return group ID of the tracing group or -1 if not found.
315 */
316 static gid_t allowed_group(void)
317 {
318 struct group *grp;
319
320 if (opt_tracing_group) {
321 grp = getgrnam(opt_tracing_group);
322 } else {
323 grp = getgrnam(default_tracing_group);
324 }
325 if (!grp) {
326 return -1;
327 } else {
328 return grp->gr_gid;
329 }
330 }
331
332 /*
333 * Init thread quit pipe.
334 *
335 * Return -1 on error or 0 if all pipes are created.
336 */
337 static int init_thread_quit_pipe(void)
338 {
339 int ret;
340
341 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
342 if (ret < 0) {
343 perror("thread quit pipe");
344 goto error;
345 }
346
347 error:
348 return ret;
349 }
350
351 /*
352 * Complete teardown of a kernel session. This free all data structure related
353 * to a kernel session and update counter.
354 */
355 static void teardown_kernel_session(struct ltt_session *session)
356 {
357 if (!session->kernel_session) {
358 DBG3("No kernel session when tearingdown session");
359 return;
360 }
361
362 DBG("Tearing down kernel session");
363
364 /*
365 * If a custom kernel consumer was registered, close the socket before
366 * tearing down the complete kernel session structure
367 */
368 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
369 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
370 }
371
372 trace_kernel_destroy_session(session->kernel_session);
373 }
374
375 /*
376 * Complete teardown of all UST sessions. This will free everything on his path
377 * and destroy the core essence of all ust sessions :)
378 */
379 static void teardown_ust_session(struct ltt_session *session)
380 {
381 int ret;
382
383 if (!session->ust_session) {
384 DBG3("No UST session when tearingdown session");
385 return;
386 }
387
388 DBG("Tearing down UST session(s)");
389
390 ret = ust_app_destroy_trace_all(session->ust_session);
391 if (ret) {
392 ERR("Error in ust_app_destroy_trace_all");
393 }
394
395 trace_ust_destroy_session(session->ust_session);
396 }
397
398 /*
399 * Stop all threads by closing the thread quit pipe.
400 */
401 static void stop_threads(void)
402 {
403 int ret;
404
405 /* Stopping all threads */
406 DBG("Terminating all threads");
407 ret = notify_thread_pipe(thread_quit_pipe[1]);
408 if (ret < 0) {
409 ERR("write error on thread quit pipe");
410 }
411
412 /* Dispatch thread */
413 dispatch_thread_exit = 1;
414 futex_nto1_wake(&ust_cmd_queue.futex);
415 }
416
417 /*
418 * Cleanup the daemon
419 */
420 static void cleanup(void)
421 {
422 int ret;
423 char *cmd;
424 struct ltt_session *sess, *stmp;
425
426 DBG("Cleaning up");
427
428 if (is_root) {
429 DBG("Removing %s directory", LTTNG_RUNDIR);
430 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
431 if (ret < 0) {
432 ERR("asprintf failed. Something is really wrong!");
433 }
434
435 /* Remove lttng run directory */
436 ret = system(cmd);
437 if (ret < 0) {
438 ERR("Unable to clean " LTTNG_RUNDIR);
439 }
440 }
441
442 DBG("Cleaning up all session");
443
444 /* Destroy session list mutex */
445 if (session_list_ptr != NULL) {
446 pthread_mutex_destroy(&session_list_ptr->lock);
447
448 /* Cleanup ALL session */
449 cds_list_for_each_entry_safe(sess, stmp,
450 &session_list_ptr->head, list) {
451 teardown_kernel_session(sess);
452 teardown_ust_session(sess);
453 free(sess);
454 }
455 }
456
457 DBG("Closing all UST sockets");
458 ust_app_clean_list();
459
460 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
461
462 DBG("Closing kernel fd");
463 close(kernel_tracer_fd);
464
465 if (is_root) {
466 DBG("Unloading kernel modules");
467 modprobe_remove_kernel_modules();
468 }
469
470 close(thread_quit_pipe[0]);
471 close(thread_quit_pipe[1]);
472
473 /* OUTPUT BENCHMARK RESULTS */
474 bench_init();
475
476 if (getenv("BENCH_UST_NOTIFY")) {
477 bench_print_ust_notification();
478 }
479
480 if (getenv("BENCH_UST_REGISTER")) {
481 bench_print_ust_register();
482 bench_print_ust_unregister();
483 }
484
485 if (getenv("BENCH_BOOT_PROCESS")) {
486 bench_print_boot_process();
487 }
488
489 bench_close();
490 /* END BENCHMARK */
491
492 /* <fun> */
493 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
494 "Matthew, BEET driven development works!%c[%dm",
495 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
496 /* </fun> */
497 }
498
499 /*
500 * Send data on a unix socket using the liblttsessiondcomm API.
501 *
502 * Return lttcomm error code.
503 */
504 static int send_unix_sock(int sock, void *buf, size_t len)
505 {
506 /* Check valid length */
507 if (len <= 0) {
508 return -1;
509 }
510
511 return lttcomm_send_unix_sock(sock, buf, len);
512 }
513
514 /*
515 * Free memory of a command context structure.
516 */
517 static void clean_command_ctx(struct command_ctx **cmd_ctx)
518 {
519 DBG("Clean command context structure");
520 if (*cmd_ctx) {
521 if ((*cmd_ctx)->llm) {
522 free((*cmd_ctx)->llm);
523 }
524 if ((*cmd_ctx)->lsm) {
525 free((*cmd_ctx)->lsm);
526 }
527 free(*cmd_ctx);
528 *cmd_ctx = NULL;
529 }
530 }
531
532 /*
533 * Send all stream fds of kernel channel to the consumer.
534 */
535 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
536 int sock, struct ltt_kernel_channel *channel)
537 {
538 int ret;
539 struct ltt_kernel_stream *stream;
540 struct lttcomm_consumer_msg lkm;
541
542 DBG("Sending streams of channel %s to kernel consumer",
543 channel->channel->name);
544
545 /* Send channel */
546 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
547 lkm.u.channel.channel_key = channel->fd;
548 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
549 lkm.u.channel.mmap_len = 0; /* for kernel */
550 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
551 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
552 if (ret < 0) {
553 perror("send consumer channel");
554 goto error;
555 }
556
557 /* Send streams */
558 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
559 if (!stream->fd) {
560 continue;
561 }
562 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
563 lkm.u.stream.channel_key = channel->fd;
564 lkm.u.stream.stream_key = stream->fd;
565 lkm.u.stream.state = stream->state;
566 lkm.u.stream.output = channel->channel->attr.output;
567 lkm.u.stream.mmap_len = 0; /* for kernel */
568 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
569 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
570 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
571 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
572 if (ret < 0) {
573 perror("send consumer stream");
574 goto error;
575 }
576 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
577 if (ret < 0) {
578 perror("send consumer stream ancillary data");
579 goto error;
580 }
581 }
582
583 DBG("consumer channel streams sent");
584
585 return 0;
586
587 error:
588 return ret;
589 }
590
591 /*
592 * Send all stream fds of the kernel session to the consumer.
593 */
594 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
595 struct ltt_kernel_session *session)
596 {
597 int ret;
598 struct ltt_kernel_channel *chan;
599 struct lttcomm_consumer_msg lkm;
600 int sock = session->consumer_fd;
601
602 DBG("Sending metadata stream fd");
603
604 /* Extra protection. It's NOT supposed to be set to 0 at this point */
605 if (session->consumer_fd == 0) {
606 session->consumer_fd = consumer_data->cmd_sock;
607 }
608
609 if (session->metadata_stream_fd != 0) {
610 /* Send metadata channel fd */
611 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
612 lkm.u.channel.channel_key = session->metadata->fd;
613 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
614 lkm.u.channel.mmap_len = 0; /* for kernel */
615 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
616 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
617 if (ret < 0) {
618 perror("send consumer channel");
619 goto error;
620 }
621
622 /* Send metadata stream fd */
623 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
624 lkm.u.stream.channel_key = session->metadata->fd;
625 lkm.u.stream.stream_key = session->metadata_stream_fd;
626 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
627 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
628 lkm.u.stream.mmap_len = 0; /* for kernel */
629 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
630 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
631 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
632 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
633 if (ret < 0) {
634 perror("send consumer stream");
635 goto error;
636 }
637 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
638 if (ret < 0) {
639 perror("send consumer stream");
640 goto error;
641 }
642 }
643
644 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
645 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
646 if (ret < 0) {
647 goto error;
648 }
649 }
650
651 DBG("consumer fds (metadata and channel streams) sent");
652
653 return 0;
654
655 error:
656 return ret;
657 }
658
659 /*
660 * Notify UST applications using the shm mmap futex.
661 */
662 static int notify_ust_apps(int active)
663 {
664 char *wait_shm_mmap;
665
666 DBG("Notifying applications of session daemon state: %d", active);
667
668 tracepoint(ust_notify_apps_start);
669
670 /* See shm.c for this call implying mmap, shm and futex calls */
671 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
672 if (wait_shm_mmap == NULL) {
673 goto error;
674 }
675
676 /* Wake waiting process */
677 futex_wait_update((int32_t *) wait_shm_mmap, active);
678
679 tracepoint(ust_notify_apps_stop);
680
681 /* Apps notified successfully */
682 return 0;
683
684 error:
685 return -1;
686 }
687
688 /*
689 * Setup the outgoing data buffer for the response (llm) by allocating the
690 * right amount of memory and copying the original information from the lsm
691 * structure.
692 *
693 * Return total size of the buffer pointed by buf.
694 */
695 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
696 {
697 int ret, buf_size;
698
699 buf_size = size;
700
701 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
702 if (cmd_ctx->llm == NULL) {
703 perror("zmalloc");
704 ret = -ENOMEM;
705 goto error;
706 }
707
708 /* Copy common data */
709 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
710 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
711
712 cmd_ctx->llm->data_size = size;
713 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
714
715 return buf_size;
716
717 error:
718 return ret;
719 }
720
721 /*
722 * Update the kernel poll set of all channel fd available over all tracing
723 * session. Add the wakeup pipe at the end of the set.
724 */
725 static int update_kernel_poll(struct lttng_poll_event *events)
726 {
727 int ret;
728 struct ltt_session *session;
729 struct ltt_kernel_channel *channel;
730
731 DBG("Updating kernel poll set");
732
733 session_lock_list();
734 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
735 session_lock(session);
736 if (session->kernel_session == NULL) {
737 session_unlock(session);
738 continue;
739 }
740
741 cds_list_for_each_entry(channel,
742 &session->kernel_session->channel_list.head, list) {
743 /* Add channel fd to the kernel poll set */
744 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
745 if (ret < 0) {
746 session_unlock(session);
747 goto error;
748 }
749 DBG("Channel fd %d added to kernel set", channel->fd);
750 }
751 session_unlock(session);
752 }
753 session_unlock_list();
754
755 return 0;
756
757 error:
758 session_unlock_list();
759 return -1;
760 }
761
762 /*
763 * Find the channel fd from 'fd' over all tracing session. When found, check
764 * for new channel stream and send those stream fds to the kernel consumer.
765 *
766 * Useful for CPU hotplug feature.
767 */
768 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
769 {
770 int ret = 0;
771 struct ltt_session *session;
772 struct ltt_kernel_channel *channel;
773
774 DBG("Updating kernel streams for channel fd %d", fd);
775
776 session_lock_list();
777 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
778 session_lock(session);
779 if (session->kernel_session == NULL) {
780 session_unlock(session);
781 continue;
782 }
783
784 /* This is not suppose to be 0 but this is an extra security check */
785 if (session->kernel_session->consumer_fd == 0) {
786 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
787 }
788
789 cds_list_for_each_entry(channel,
790 &session->kernel_session->channel_list.head, list) {
791 if (channel->fd == fd) {
792 DBG("Channel found, updating kernel streams");
793 ret = kernel_open_channel_stream(channel);
794 if (ret < 0) {
795 goto error;
796 }
797
798 /*
799 * Have we already sent fds to the consumer? If yes, it means
800 * that tracing is started so it is safe to send our updated
801 * stream fds.
802 */
803 if (session->kernel_session->consumer_fds_sent == 1) {
804 ret = send_kconsumer_channel_streams(consumer_data,
805 session->kernel_session->consumer_fd, channel);
806 if (ret < 0) {
807 goto error;
808 }
809 }
810 goto error;
811 }
812 }
813 session_unlock(session);
814 }
815 session_unlock_list();
816 return ret;
817
818 error:
819 session_unlock(session);
820 session_unlock_list();
821 return ret;
822 }
823
824 /*
825 * For each tracing session, update newly registered apps.
826 */
827 static void update_ust_app(int app_sock)
828 {
829 struct ltt_session *sess, *stmp;
830
831 /* For all tracing session(s) */
832 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
833 if (sess->ust_session) {
834 ust_app_global_update(sess->ust_session, app_sock);
835 }
836 }
837 }
838
839 /*
840 * This thread manage event coming from the kernel.
841 *
842 * Features supported in this thread:
843 * -) CPU Hotplug
844 */
845 static void *thread_manage_kernel(void *data)
846 {
847 int ret, i, pollfd, update_poll_flag = 1;
848 uint32_t revents, nb_fd;
849 char tmp;
850 struct lttng_poll_event events;
851
852 tracepoint(sessiond_th_kern_start);
853
854 DBG("Thread manage kernel started");
855
856 ret = create_thread_poll_set(&events, 2);
857 if (ret < 0) {
858 goto error;
859 }
860
861 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
862 if (ret < 0) {
863 goto error;
864 }
865
866 while (1) {
867 if (update_poll_flag == 1) {
868 /*
869 * Reset number of fd in the poll set. Always 2 since there is the thread
870 * quit pipe and the kernel pipe.
871 */
872 events.nb_fd = 2;
873
874 ret = update_kernel_poll(&events);
875 if (ret < 0) {
876 goto error;
877 }
878 update_poll_flag = 0;
879 }
880
881 nb_fd = LTTNG_POLL_GETNB(&events);
882
883 DBG("Thread kernel polling on %d fds", nb_fd);
884
885 /* Zeroed the poll events */
886 lttng_poll_reset(&events);
887
888 tracepoint(sessiond_th_kern_poll);
889
890 /* Poll infinite value of time */
891 ret = lttng_poll_wait(&events, -1);
892 if (ret < 0) {
893 goto error;
894 } else if (ret == 0) {
895 /* Should not happen since timeout is infinite */
896 ERR("Return value of poll is 0 with an infinite timeout.\n"
897 "This should not have happened! Continuing...");
898 continue;
899 }
900
901 for (i = 0; i < nb_fd; i++) {
902 /* Fetch once the poll data */
903 revents = LTTNG_POLL_GETEV(&events, i);
904 pollfd = LTTNG_POLL_GETFD(&events, i);
905
906 /* Thread quit pipe has been closed. Killing thread. */
907 ret = check_thread_quit_pipe(pollfd, revents);
908 if (ret) {
909 goto error;
910 }
911
912 /* Check for data on kernel pipe */
913 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
914 ret = read(kernel_poll_pipe[0], &tmp, 1);
915 update_poll_flag = 1;
916 continue;
917 } else {
918 /*
919 * New CPU detected by the kernel. Adding kernel stream to
920 * kernel session and updating the kernel consumer
921 */
922 if (revents & LPOLLIN) {
923 ret = update_kernel_stream(&kconsumer_data, pollfd);
924 if (ret < 0) {
925 continue;
926 }
927 break;
928 /*
929 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
930 * and unregister kernel stream at this point.
931 */
932 }
933 }
934 }
935 }
936
937 error:
938 DBG("Kernel thread dying");
939 close(kernel_poll_pipe[0]);
940 close(kernel_poll_pipe[1]);
941
942 lttng_poll_clean(&events);
943
944 return NULL;
945 }
946
947 /*
948 * This thread manage the consumer error sent back to the session daemon.
949 */
950 static void *thread_manage_consumer(void *data)
951 {
952 int sock = 0, i, ret, pollfd;
953 uint32_t revents, nb_fd;
954 enum lttcomm_return_code code;
955 struct lttng_poll_event events;
956 struct consumer_data *consumer_data = data;
957
958 tracepoint(sessiond_th_kcon_start);
959
960 DBG("[thread] Manage consumer started");
961
962 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
963 if (ret < 0) {
964 goto error;
965 }
966
967 /*
968 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
969 * Nothing more will be added to this poll set.
970 */
971 ret = create_thread_poll_set(&events, 2);
972 if (ret < 0) {
973 goto error;
974 }
975
976 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
977 if (ret < 0) {
978 goto error;
979 }
980
981 nb_fd = LTTNG_POLL_GETNB(&events);
982
983 tracepoint(sessiond_th_kcon_poll);
984
985 /* Inifinite blocking call, waiting for transmission */
986 ret = lttng_poll_wait(&events, -1);
987 if (ret < 0) {
988 goto error;
989 }
990
991 for (i = 0; i < nb_fd; i++) {
992 /* Fetch once the poll data */
993 revents = LTTNG_POLL_GETEV(&events, i);
994 pollfd = LTTNG_POLL_GETFD(&events, i);
995
996 /* Thread quit pipe has been closed. Killing thread. */
997 ret = check_thread_quit_pipe(pollfd, revents);
998 if (ret) {
999 goto error;
1000 }
1001
1002 /* Event on the registration socket */
1003 if (pollfd == consumer_data->err_sock) {
1004 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1005 ERR("consumer err socket poll error");
1006 goto error;
1007 }
1008 }
1009 }
1010
1011 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
1012 if (sock < 0) {
1013 goto error;
1014 }
1015
1016 DBG2("Receiving code from consumer err_sock");
1017
1018 /* Getting status code from kconsumerd */
1019 ret = lttcomm_recv_unix_sock(sock, &code,
1020 sizeof(enum lttcomm_return_code));
1021 if (ret <= 0) {
1022 goto error;
1023 }
1024
1025 if (code == CONSUMERD_COMMAND_SOCK_READY) {
1026 consumer_data->cmd_sock =
1027 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
1028 if (consumer_data->cmd_sock < 0) {
1029 sem_post(&consumer_data->sem);
1030 PERROR("consumer connect");
1031 goto error;
1032 }
1033 /* Signal condition to tell that the kconsumerd is ready */
1034 sem_post(&consumer_data->sem);
1035 DBG("consumer command socket ready");
1036 } else {
1037 ERR("consumer error when waiting for SOCK_READY : %s",
1038 lttcomm_get_readable_code(-code));
1039 goto error;
1040 }
1041
1042 /* Remove the kconsumerd error sock since we've established a connexion */
1043 ret = lttng_poll_del(&events, consumer_data->err_sock);
1044 if (ret < 0) {
1045 goto error;
1046 }
1047
1048 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1049 if (ret < 0) {
1050 goto error;
1051 }
1052
1053 /* Update number of fd */
1054 nb_fd = LTTNG_POLL_GETNB(&events);
1055
1056 /* Inifinite blocking call, waiting for transmission */
1057 ret = lttng_poll_wait(&events, -1);
1058 if (ret < 0) {
1059 goto error;
1060 }
1061
1062 for (i = 0; i < nb_fd; i++) {
1063 /* Fetch once the poll data */
1064 revents = LTTNG_POLL_GETEV(&events, i);
1065 pollfd = LTTNG_POLL_GETFD(&events, i);
1066
1067 /* Thread quit pipe has been closed. Killing thread. */
1068 ret = check_thread_quit_pipe(pollfd, revents);
1069 if (ret) {
1070 goto error;
1071 }
1072
1073 /* Event on the kconsumerd socket */
1074 if (pollfd == sock) {
1075 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1076 ERR("consumer err socket second poll error");
1077 goto error;
1078 }
1079 }
1080 }
1081
1082 /* Wait for any kconsumerd error */
1083 ret = lttcomm_recv_unix_sock(sock, &code,
1084 sizeof(enum lttcomm_return_code));
1085 if (ret <= 0) {
1086 ERR("consumer closed the command socket");
1087 goto error;
1088 }
1089
1090 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1091
1092 error:
1093 DBG("consumer thread dying");
1094 close(consumer_data->err_sock);
1095 close(consumer_data->cmd_sock);
1096 close(sock);
1097
1098 unlink(consumer_data->err_unix_sock_path);
1099 unlink(consumer_data->cmd_unix_sock_path);
1100 consumer_data->pid = 0;
1101
1102 lttng_poll_clean(&events);
1103
1104 return NULL;
1105 }
1106
1107 /*
1108 * This thread manage application communication.
1109 */
1110 static void *thread_manage_apps(void *data)
1111 {
1112 int i, ret, pollfd;
1113 uint32_t revents, nb_fd;
1114 struct ust_command ust_cmd;
1115 struct lttng_poll_event events;
1116
1117 tracepoint(sessiond_th_apps_start);
1118
1119 DBG("[thread] Manage application started");
1120
1121 rcu_register_thread();
1122 rcu_thread_online();
1123
1124 ret = create_thread_poll_set(&events, 2);
1125 if (ret < 0) {
1126 goto error;
1127 }
1128
1129 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1130 if (ret < 0) {
1131 goto error;
1132 }
1133
1134 while (1) {
1135 /* Zeroed the events structure */
1136 lttng_poll_reset(&events);
1137
1138 nb_fd = LTTNG_POLL_GETNB(&events);
1139
1140 DBG("Apps thread polling on %d fds", nb_fd);
1141
1142 tracepoint(sessiond_th_apps_poll);
1143
1144 /* Inifinite blocking call, waiting for transmission */
1145 ret = lttng_poll_wait(&events, -1);
1146 if (ret < 0) {
1147 goto error;
1148 }
1149
1150 for (i = 0; i < nb_fd; i++) {
1151 /* Fetch once the poll data */
1152 revents = LTTNG_POLL_GETEV(&events, i);
1153 pollfd = LTTNG_POLL_GETFD(&events, i);
1154
1155 /* Thread quit pipe has been closed. Killing thread. */
1156 ret = check_thread_quit_pipe(pollfd, revents);
1157 if (ret) {
1158 goto error;
1159 }
1160
1161 /* Inspect the apps cmd pipe */
1162 if (pollfd == apps_cmd_pipe[0]) {
1163 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1164 ERR("Apps command pipe error");
1165 goto error;
1166 } else if (revents & LPOLLIN) {
1167 tracepoint(ust_register_read_start);
1168 /* Empty pipe */
1169 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1170 if (ret < 0 || ret < sizeof(ust_cmd)) {
1171 perror("read apps cmd pipe");
1172 goto error;
1173 }
1174 tracepoint(ust_register_read_stop);
1175
1176 tracepoint(ust_register_add_start);
1177 /* Register applicaton to the session daemon */
1178 ret = ust_app_register(&ust_cmd.reg_msg,
1179 ust_cmd.sock);
1180 if (ret == -ENOMEM) {
1181 goto error;
1182 } else if (ret < 0) {
1183 break;
1184 }
1185 tracepoint(ust_register_add_stop);
1186
1187 tracepoint(ust_register_done_start);
1188 /*
1189 * Add channel(s) and event(s) to newly registered apps
1190 * from lttng global UST domain.
1191 */
1192 update_ust_app(ust_cmd.sock);
1193
1194 ret = ustctl_register_done(ust_cmd.sock);
1195 if (ret < 0) {
1196 /*
1197 * If the registration is not possible, we simply
1198 * unregister the apps and continue
1199 */
1200 ust_app_unregister(ust_cmd.sock);
1201 } else {
1202 /*
1203 * We just need here to monitor the close of the UST
1204 * socket and poll set monitor those by default.
1205 */
1206 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1207 if (ret < 0) {
1208 goto error;
1209 }
1210
1211 DBG("Apps with sock %d added to poll set",
1212 ust_cmd.sock);
1213 }
1214 tracepoint(ust_register_done_stop);
1215 break;
1216 }
1217 } else {
1218 /*
1219 * At this point, we know that a registered application made
1220 * the event at poll_wait.
1221 */
1222 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1223 /* Removing from the poll set */
1224 ret = lttng_poll_del(&events, pollfd);
1225 if (ret < 0) {
1226 goto error;
1227 }
1228
1229 /* Socket closed on remote end. */
1230 ust_app_unregister(pollfd);
1231 break;
1232 }
1233 }
1234 }
1235 }
1236
1237 error:
1238 DBG("Application communication apps dying");
1239 close(apps_cmd_pipe[0]);
1240 close(apps_cmd_pipe[1]);
1241
1242 lttng_poll_clean(&events);
1243
1244 rcu_thread_offline();
1245 rcu_unregister_thread();
1246 return NULL;
1247 }
1248
1249 /*
1250 * Dispatch request from the registration threads to the application
1251 * communication thread.
1252 */
1253 static void *thread_dispatch_ust_registration(void *data)
1254 {
1255 int ret;
1256 struct cds_wfq_node *node;
1257 struct ust_command *ust_cmd = NULL;
1258
1259 tracepoint(sessiond_th_dispatch_start);
1260
1261 DBG("[thread] Dispatch UST command started");
1262
1263 while (!dispatch_thread_exit) {
1264 /* Atomically prepare the queue futex */
1265 futex_nto1_prepare(&ust_cmd_queue.futex);
1266
1267 do {
1268 tracepoint(sessiond_th_dispatch_block);
1269
1270 /* Dequeue command for registration */
1271 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1272 if (node == NULL) {
1273 DBG("Woken up but nothing in the UST command queue");
1274 /* Continue thread execution */
1275 break;
1276 }
1277
1278 tracepoint(ust_dispatch_register_start);
1279
1280 ust_cmd = caa_container_of(node, struct ust_command, node);
1281
1282 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1283 " gid:%d sock:%d name:%s (version %d.%d)",
1284 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1285 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1286 ust_cmd->sock, ust_cmd->reg_msg.name,
1287 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1288 /*
1289 * Inform apps thread of the new application registration. This
1290 * call is blocking so we can be assured that the data will be read
1291 * at some point in time or wait to the end of the world :)
1292 */
1293 ret = write(apps_cmd_pipe[1], ust_cmd,
1294 sizeof(struct ust_command));
1295 if (ret < 0) {
1296 perror("write apps cmd pipe");
1297 if (errno == EBADF) {
1298 /*
1299 * We can't inform the application thread to process
1300 * registration. We will exit or else application
1301 * registration will not occur and tracing will never
1302 * start.
1303 */
1304 goto error;
1305 }
1306 }
1307 free(ust_cmd);
1308 } while (node != NULL);
1309
1310 tracepoint(ust_dispatch_register_stop);
1311
1312 /* Futex wait on queue. Blocking call on futex() */
1313 futex_nto1_wait(&ust_cmd_queue.futex);
1314 }
1315
1316 error:
1317 DBG("Dispatch thread dying");
1318 return NULL;
1319 }
1320
1321 /*
1322 * This thread manage application registration.
1323 */
1324 static void *thread_registration_apps(void *data)
1325 {
1326 int sock = 0, i, ret, pollfd;
1327 uint32_t revents, nb_fd;
1328 struct lttng_poll_event events;
1329 /*
1330 * Get allocated in this thread, enqueued to a global queue, dequeued and
1331 * freed in the manage apps thread.
1332 */
1333 struct ust_command *ust_cmd = NULL;
1334
1335 tracepoint(sessiond_th_reg_start);
1336
1337 DBG("[thread] Manage application registration started");
1338
1339 ret = lttcomm_listen_unix_sock(apps_sock);
1340 if (ret < 0) {
1341 goto error;
1342 }
1343
1344 /*
1345 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1346 * more will be added to this poll set.
1347 */
1348 ret = create_thread_poll_set(&events, 2);
1349 if (ret < 0) {
1350 goto error;
1351 }
1352
1353 /* Add the application registration socket */
1354 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1355 if (ret < 0) {
1356 goto error;
1357 }
1358
1359 /* Notify all applications to register */
1360 ret = notify_ust_apps(1);
1361 if (ret < 0) {
1362 ERR("Failed to notify applications or create the wait shared memory.\n"
1363 "Execution continues but there might be problem for already\n"
1364 "running applications that wishes to register.");
1365 }
1366
1367 while (1) {
1368 DBG("Accepting application registration");
1369
1370 tracepoint(sessiond_th_reg_poll);
1371
1372 nb_fd = LTTNG_POLL_GETNB(&events);
1373
1374 /* Inifinite blocking call, waiting for transmission */
1375 ret = lttng_poll_wait(&events, -1);
1376 if (ret < 0) {
1377 goto error;
1378 }
1379
1380 for (i = 0; i < nb_fd; i++) {
1381 /* Fetch once the poll data */
1382 revents = LTTNG_POLL_GETEV(&events, i);
1383 pollfd = LTTNG_POLL_GETFD(&events, i);
1384
1385 /* Thread quit pipe has been closed. Killing thread. */
1386 ret = check_thread_quit_pipe(pollfd, revents);
1387 if (ret) {
1388 goto error;
1389 }
1390
1391 /* Event on the registration socket */
1392 if (pollfd == apps_sock) {
1393 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1394 ERR("Register apps socket poll error");
1395 goto error;
1396 } else if (revents & LPOLLIN) {
1397 /* Registration starts here. Recording cycles */
1398 tracepoint(ust_register_start);
1399
1400 sock = lttcomm_accept_unix_sock(apps_sock);
1401 if (sock < 0) {
1402 goto error;
1403 }
1404
1405 /* Create UST registration command for enqueuing */
1406 ust_cmd = zmalloc(sizeof(struct ust_command));
1407 if (ust_cmd == NULL) {
1408 perror("ust command zmalloc");
1409 goto error;
1410 }
1411
1412 /*
1413 * Using message-based transmissions to ensure we don't
1414 * have to deal with partially received messages.
1415 */
1416 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1417 sizeof(struct ust_register_msg));
1418 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1419 if (ret < 0) {
1420 perror("lttcomm_recv_unix_sock register apps");
1421 } else {
1422 ERR("Wrong size received on apps register");
1423 }
1424 free(ust_cmd);
1425 close(sock);
1426 continue;
1427 }
1428
1429 ust_cmd->sock = sock;
1430
1431 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1432 " gid:%d sock:%d name:%s (version %d.%d)",
1433 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1434 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1435 ust_cmd->sock, ust_cmd->reg_msg.name,
1436 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1437
1438 /*
1439 * Lock free enqueue the registration request. The red pill
1440 * has been taken! This apps will be part of the *system*.
1441 */
1442 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1443
1444 /*
1445 * Wake the registration queue futex. Implicit memory
1446 * barrier with the exchange in cds_wfq_enqueue.
1447 */
1448 futex_nto1_wake(&ust_cmd_queue.futex);
1449
1450 tracepoint(ust_register_stop);
1451 }
1452 }
1453 }
1454 }
1455
1456 error:
1457 DBG("UST Registration thread dying");
1458
1459 /* Notify that the registration thread is gone */
1460 notify_ust_apps(0);
1461
1462 close(apps_sock);
1463 close(sock);
1464 unlink(apps_unix_sock_path);
1465
1466 lttng_poll_clean(&events);
1467
1468 return NULL;
1469 }
1470
1471 /*
1472 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1473 * exec or it will fails.
1474 */
1475 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1476 {
1477 int ret;
1478 struct timespec timeout;
1479
1480 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1481 timeout.tv_nsec = 0;
1482
1483 /* Setup semaphore */
1484 ret = sem_init(&consumer_data->sem, 0, 0);
1485 if (ret < 0) {
1486 PERROR("sem_init consumer semaphore");
1487 goto error;
1488 }
1489
1490 ret = pthread_create(&consumer_data->thread, NULL,
1491 thread_manage_consumer, consumer_data);
1492 if (ret != 0) {
1493 PERROR("pthread_create consumer");
1494 ret = -1;
1495 goto error;
1496 }
1497
1498 /* Get time for sem_timedwait absolute timeout */
1499 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1500 if (ret < 0) {
1501 PERROR("clock_gettime spawn consumer");
1502 /* Infinite wait for the kconsumerd thread to be ready */
1503 ret = sem_wait(&consumer_data->sem);
1504 } else {
1505 /* Normal timeout if the gettime was successful */
1506 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1507 ret = sem_timedwait(&consumer_data->sem, &timeout);
1508 }
1509
1510 if (ret < 0) {
1511 if (errno == ETIMEDOUT) {
1512 /*
1513 * Call has timed out so we kill the kconsumerd_thread and return
1514 * an error.
1515 */
1516 ERR("The consumer thread was never ready. Killing it");
1517 ret = pthread_cancel(consumer_data->thread);
1518 if (ret < 0) {
1519 PERROR("pthread_cancel consumer thread");
1520 }
1521 } else {
1522 PERROR("semaphore wait failed consumer thread");
1523 }
1524 goto error;
1525 }
1526
1527 pthread_mutex_lock(&consumer_data->pid_mutex);
1528 if (consumer_data->pid == 0) {
1529 ERR("Kconsumerd did not start");
1530 pthread_mutex_unlock(&consumer_data->pid_mutex);
1531 goto error;
1532 }
1533 pthread_mutex_unlock(&consumer_data->pid_mutex);
1534
1535 return 0;
1536
1537 error:
1538 return ret;
1539 }
1540
1541 /*
1542 * Join consumer thread
1543 */
1544 static int join_consumer_thread(struct consumer_data *consumer_data)
1545 {
1546 void *status;
1547 int ret;
1548
1549 if (consumer_data->pid != 0) {
1550 ret = kill(consumer_data->pid, SIGTERM);
1551 if (ret) {
1552 ERR("Error killing consumer daemon");
1553 return ret;
1554 }
1555 return pthread_join(consumer_data->thread, &status);
1556 } else {
1557 return 0;
1558 }
1559 }
1560
1561 /*
1562 * Fork and exec a consumer daemon (consumerd).
1563 *
1564 * Return pid if successful else -1.
1565 */
1566 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1567 {
1568 int ret;
1569 pid_t pid;
1570 const char *verbosity;
1571
1572 DBG("Spawning consumerd");
1573
1574 pid = fork();
1575 if (pid == 0) {
1576 /*
1577 * Exec consumerd.
1578 */
1579 if (opt_verbose > 1 || opt_verbose_consumer) {
1580 verbosity = "--verbose";
1581 } else {
1582 verbosity = "--quiet";
1583 }
1584 switch (consumer_data->type) {
1585 case LTTNG_CONSUMER_KERNEL:
1586 execl(INSTALL_BIN_PATH "/lttng-consumerd",
1587 "lttng-consumerd", verbosity, "-k",
1588 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1589 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1590 NULL);
1591 break;
1592 case LTTNG_CONSUMER64_UST:
1593 {
1594 char *tmpnew = NULL;
1595
1596 if (consumerd64_libdir[0] != '\0') {
1597 char *tmp;
1598 size_t tmplen;
1599
1600 tmp = getenv("LD_LIBRARY_PATH");
1601 if (!tmp) {
1602 tmp = "";
1603 }
1604 tmplen = strlen("LD_LIBRARY_PATH=")
1605 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1606 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1607 if (!tmpnew) {
1608 ret = -ENOMEM;
1609 goto error;
1610 }
1611 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1612 strcat(tmpnew, consumerd64_libdir);
1613 if (tmp[0] != '\0') {
1614 strcat(tmpnew, ":");
1615 strcat(tmpnew, tmp);
1616 }
1617 ret = putenv(tmpnew);
1618 if (ret) {
1619 ret = -errno;
1620 goto error;
1621 }
1622 }
1623 ret = execl(consumerd64_path, verbosity, "-u",
1624 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1625 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1626 NULL);
1627 if (consumerd64_libdir[0] != '\0') {
1628 free(tmpnew);
1629 }
1630 if (ret) {
1631 goto error;
1632 }
1633 break;
1634 }
1635 case LTTNG_CONSUMER32_UST:
1636 {
1637 char *tmpnew = NULL;
1638
1639 if (consumerd32_libdir[0] != '\0') {
1640 char *tmp;
1641 size_t tmplen;
1642
1643 tmp = getenv("LD_LIBRARY_PATH");
1644 if (!tmp) {
1645 tmp = "";
1646 }
1647 tmplen = strlen("LD_LIBRARY_PATH=")
1648 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1649 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1650 if (!tmpnew) {
1651 ret = -ENOMEM;
1652 goto error;
1653 }
1654 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1655 strcat(tmpnew, consumerd32_libdir);
1656 if (tmp[0] != '\0') {
1657 strcat(tmpnew, ":");
1658 strcat(tmpnew, tmp);
1659 }
1660 ret = putenv(tmpnew);
1661 if (ret) {
1662 ret = -errno;
1663 goto error;
1664 }
1665 }
1666 ret = execl(consumerd32_path, verbosity, "-u",
1667 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1668 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1669 NULL);
1670 if (consumerd32_libdir[0] != '\0') {
1671 free(tmpnew);
1672 }
1673 if (ret) {
1674 goto error;
1675 }
1676 break;
1677 }
1678 default:
1679 perror("unknown consumer type");
1680 exit(EXIT_FAILURE);
1681 }
1682 if (errno != 0) {
1683 perror("kernel start consumer exec");
1684 }
1685 exit(EXIT_FAILURE);
1686 } else if (pid > 0) {
1687 ret = pid;
1688 } else {
1689 perror("start consumer fork");
1690 ret = -errno;
1691 }
1692 error:
1693 return ret;
1694 }
1695
1696 /*
1697 * Spawn the consumerd daemon and session daemon thread.
1698 */
1699 static int start_consumerd(struct consumer_data *consumer_data)
1700 {
1701 int ret;
1702
1703 pthread_mutex_lock(&consumer_data->pid_mutex);
1704 if (consumer_data->pid != 0) {
1705 pthread_mutex_unlock(&consumer_data->pid_mutex);
1706 goto end;
1707 }
1708
1709 ret = spawn_consumerd(consumer_data);
1710 if (ret < 0) {
1711 ERR("Spawning consumerd failed");
1712 pthread_mutex_unlock(&consumer_data->pid_mutex);
1713 goto error;
1714 }
1715
1716 /* Setting up the consumer_data pid */
1717 consumer_data->pid = ret;
1718 DBG2("Consumer pid %d", consumer_data->pid);
1719 pthread_mutex_unlock(&consumer_data->pid_mutex);
1720
1721 DBG2("Spawning consumer control thread");
1722 ret = spawn_consumer_thread(consumer_data);
1723 if (ret < 0) {
1724 ERR("Fatal error spawning consumer control thread");
1725 goto error;
1726 }
1727
1728 end:
1729 return 0;
1730
1731 error:
1732 return ret;
1733 }
1734
1735 /*
1736 * modprobe_kernel_modules
1737 */
1738 static int modprobe_kernel_modules(void)
1739 {
1740 int ret = 0, i;
1741 char modprobe[256];
1742
1743 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1744 ret = snprintf(modprobe, sizeof(modprobe),
1745 "/sbin/modprobe %s%s",
1746 kernel_modules_list[i].required ? "" : "-q ",
1747 kernel_modules_list[i].name);
1748 if (ret < 0) {
1749 perror("snprintf modprobe");
1750 goto error;
1751 }
1752 modprobe[sizeof(modprobe) - 1] = '\0';
1753 ret = system(modprobe);
1754 if (ret == -1) {
1755 ERR("Unable to launch modprobe for module %s",
1756 kernel_modules_list[i].name);
1757 } else if (kernel_modules_list[i].required
1758 && WEXITSTATUS(ret) != 0) {
1759 ERR("Unable to load module %s",
1760 kernel_modules_list[i].name);
1761 } else {
1762 DBG("Modprobe successfully %s",
1763 kernel_modules_list[i].name);
1764 }
1765 }
1766
1767 error:
1768 return ret;
1769 }
1770
1771 /*
1772 * mount_debugfs
1773 */
1774 static int mount_debugfs(char *path)
1775 {
1776 int ret;
1777 char *type = "debugfs";
1778
1779 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1780 if (ret < 0) {
1781 PERROR("Cannot create debugfs path");
1782 goto error;
1783 }
1784
1785 ret = mount(type, path, type, 0, NULL);
1786 if (ret < 0) {
1787 PERROR("Cannot mount debugfs");
1788 goto error;
1789 }
1790
1791 DBG("Mounted debugfs successfully at %s", path);
1792
1793 error:
1794 return ret;
1795 }
1796
1797 /*
1798 * Setup necessary data for kernel tracer action.
1799 */
1800 static void init_kernel_tracer(void)
1801 {
1802 int ret;
1803 char *proc_mounts = "/proc/mounts";
1804 char line[256];
1805 char *debugfs_path = NULL, *lttng_path = NULL;
1806 FILE *fp;
1807
1808 /* Detect debugfs */
1809 fp = fopen(proc_mounts, "r");
1810 if (fp == NULL) {
1811 ERR("Unable to probe %s", proc_mounts);
1812 goto error;
1813 }
1814
1815 while (fgets(line, sizeof(line), fp) != NULL) {
1816 if (strstr(line, "debugfs") != NULL) {
1817 /* Remove first string */
1818 strtok(line, " ");
1819 /* Dup string here so we can reuse line later on */
1820 debugfs_path = strdup(strtok(NULL, " "));
1821 DBG("Got debugfs path : %s", debugfs_path);
1822 break;
1823 }
1824 }
1825
1826 fclose(fp);
1827
1828 /* Mount debugfs if needded */
1829 if (debugfs_path == NULL) {
1830 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1831 if (ret < 0) {
1832 perror("asprintf debugfs path");
1833 goto error;
1834 }
1835 ret = mount_debugfs(debugfs_path);
1836 if (ret < 0) {
1837 perror("Cannot mount debugfs");
1838 goto error;
1839 }
1840 }
1841
1842 /* Modprobe lttng kernel modules */
1843 ret = modprobe_kernel_modules();
1844 if (ret < 0) {
1845 goto error;
1846 }
1847
1848 /* Setup lttng kernel path */
1849 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1850 if (ret < 0) {
1851 perror("asprintf lttng path");
1852 goto error;
1853 }
1854
1855 /* Open debugfs lttng */
1856 kernel_tracer_fd = open(lttng_path, O_RDWR);
1857 if (kernel_tracer_fd < 0) {
1858 DBG("Failed to open %s", lttng_path);
1859 goto error;
1860 }
1861
1862 free(lttng_path);
1863 free(debugfs_path);
1864 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1865 return;
1866
1867 error:
1868 if (lttng_path) {
1869 free(lttng_path);
1870 }
1871 if (debugfs_path) {
1872 free(debugfs_path);
1873 }
1874 WARN("No kernel tracer available");
1875 kernel_tracer_fd = 0;
1876 return;
1877 }
1878
1879 /*
1880 * Init tracing by creating trace directory and sending fds kernel consumer.
1881 */
1882 static int init_kernel_tracing(struct ltt_kernel_session *session)
1883 {
1884 int ret = 0;
1885
1886 if (session->consumer_fds_sent == 0) {
1887 /*
1888 * Assign default kernel consumer socket if no consumer assigned to the
1889 * kernel session. At this point, it's NOT suppose to be 0 but this is
1890 * an extra security check.
1891 */
1892 if (session->consumer_fd == 0) {
1893 session->consumer_fd = kconsumer_data.cmd_sock;
1894 }
1895
1896 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1897 if (ret < 0) {
1898 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1899 goto error;
1900 }
1901
1902 session->consumer_fds_sent = 1;
1903 }
1904
1905 error:
1906 return ret;
1907 }
1908
1909 /*
1910 * Create an UST session and add it to the session ust list.
1911 */
1912 static int create_ust_session(struct ltt_session *session,
1913 struct lttng_domain *domain)
1914 {
1915 int ret;
1916 unsigned int uid;
1917 struct ltt_ust_session *lus = NULL;
1918
1919 switch (domain->type) {
1920 case LTTNG_DOMAIN_UST:
1921 break;
1922 default:
1923 ret = LTTCOMM_UNKNOWN_DOMAIN;
1924 goto error;
1925 }
1926
1927 DBG("Creating UST session");
1928
1929 uid = session->uid;
1930 lus = trace_ust_create_session(session->path, uid, domain);
1931 if (lus == NULL) {
1932 ret = LTTCOMM_UST_SESS_FAIL;
1933 goto error;
1934 }
1935
1936 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1937 geteuid(), allowed_group());
1938 if (ret < 0) {
1939 if (ret != -EEXIST) {
1940 ERR("Trace directory creation error");
1941 ret = LTTCOMM_UST_SESS_FAIL;
1942 goto error;
1943 }
1944 }
1945
1946 /* The domain type dictate different actions on session creation */
1947 switch (domain->type) {
1948 case LTTNG_DOMAIN_UST:
1949 /* No ustctl for the global UST domain */
1950 break;
1951 default:
1952 ERR("Unknown UST domain on create session %d", domain->type);
1953 goto error;
1954 }
1955 session->ust_session = lus;
1956
1957 return LTTCOMM_OK;
1958
1959 error:
1960 free(lus);
1961 return ret;
1962 }
1963
1964 /*
1965 * Create a kernel tracer session then create the default channel.
1966 */
1967 static int create_kernel_session(struct ltt_session *session)
1968 {
1969 int ret;
1970
1971 DBG("Creating kernel session");
1972
1973 ret = kernel_create_session(session, kernel_tracer_fd);
1974 if (ret < 0) {
1975 ret = LTTCOMM_KERN_SESS_FAIL;
1976 goto error;
1977 }
1978
1979 /* Set kernel consumer socket fd */
1980 if (kconsumer_data.cmd_sock) {
1981 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1982 }
1983
1984 ret = mkdir_recursive(session->kernel_session->trace_path,
1985 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
1986 if (ret < 0) {
1987 if (ret != -EEXIST) {
1988 ERR("Trace directory creation error");
1989 goto error;
1990 }
1991 }
1992
1993 error:
1994 return ret;
1995 }
1996
1997 /*
1998 * Using the session list, filled a lttng_session array to send back to the
1999 * client for session listing.
2000 *
2001 * The session list lock MUST be acquired before calling this function. Use
2002 * session_lock_list() and session_unlock_list().
2003 */
2004 static void list_lttng_sessions(struct lttng_session *sessions)
2005 {
2006 int i = 0;
2007 struct ltt_session *session;
2008
2009 DBG("Getting all available session");
2010 /*
2011 * Iterate over session list and append data after the control struct in
2012 * the buffer.
2013 */
2014 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2015 strncpy(sessions[i].path, session->path, PATH_MAX);
2016 sessions[i].path[PATH_MAX - 1] = '\0';
2017 strncpy(sessions[i].name, session->name, NAME_MAX);
2018 sessions[i].name[NAME_MAX - 1] = '\0';
2019 sessions[i].enabled = session->enabled;
2020 i++;
2021 }
2022 }
2023
2024 /*
2025 * Fill lttng_channel array of all channels.
2026 */
2027 static void list_lttng_channels(int domain, struct ltt_session *session,
2028 struct lttng_channel *channels)
2029 {
2030 int i = 0;
2031 struct ltt_kernel_channel *kchan;
2032
2033 DBG("Listing channels for session %s", session->name);
2034
2035 switch (domain) {
2036 case LTTNG_DOMAIN_KERNEL:
2037 /* Kernel channels */
2038 if (session->kernel_session != NULL) {
2039 cds_list_for_each_entry(kchan,
2040 &session->kernel_session->channel_list.head, list) {
2041 /* Copy lttng_channel struct to array */
2042 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2043 channels[i].enabled = kchan->enabled;
2044 i++;
2045 }
2046 }
2047 break;
2048 case LTTNG_DOMAIN_UST:
2049 {
2050 struct cds_lfht_iter iter;
2051 struct ltt_ust_channel *uchan;
2052
2053 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2054 &iter, uchan, node) {
2055 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2056 channels[i].attr.overwrite = uchan->attr.overwrite;
2057 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2058 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2059 channels[i].attr.switch_timer_interval =
2060 uchan->attr.switch_timer_interval;
2061 channels[i].attr.read_timer_interval =
2062 uchan->attr.read_timer_interval;
2063 channels[i].enabled = uchan->enabled;
2064 switch (uchan->attr.output) {
2065 case LTTNG_UST_MMAP:
2066 default:
2067 channels[i].attr.output = LTTNG_EVENT_MMAP;
2068 break;
2069 }
2070 i++;
2071 }
2072 break;
2073 }
2074 default:
2075 break;
2076 }
2077 }
2078
2079 /*
2080 * Create a list of ust global domain events.
2081 */
2082 static int list_lttng_ust_global_events(char *channel_name,
2083 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2084 {
2085 int i = 0, ret = 0;
2086 unsigned int nb_event = 0;
2087 struct cds_lfht_iter iter;
2088 struct cds_lfht_node *node;
2089 struct ltt_ust_channel *uchan;
2090 struct ltt_ust_event *uevent;
2091 struct lttng_event *tmp;
2092
2093 DBG("Listing UST global events for channel %s", channel_name);
2094
2095 rcu_read_lock();
2096
2097 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2098 strlen(channel_name), &iter);
2099 if (node == NULL) {
2100 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2101 goto error;
2102 }
2103
2104 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2105
2106 nb_event += hashtable_get_count(uchan->events);
2107
2108 if (nb_event == 0) {
2109 ret = nb_event;
2110 goto error;
2111 }
2112
2113 DBG3("Listing UST global %d events", nb_event);
2114
2115 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2116 if (tmp == NULL) {
2117 ret = -LTTCOMM_FATAL;
2118 goto error;
2119 }
2120
2121 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2122 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2123 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2124 tmp[i].enabled = uevent->enabled;
2125 switch (uevent->attr.instrumentation) {
2126 case LTTNG_UST_TRACEPOINT:
2127 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2128 break;
2129 case LTTNG_UST_PROBE:
2130 tmp[i].type = LTTNG_EVENT_PROBE;
2131 break;
2132 case LTTNG_UST_FUNCTION:
2133 tmp[i].type = LTTNG_EVENT_FUNCTION;
2134 break;
2135 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2136 /* TODO */
2137 ret = -LTTCOMM_NOT_IMPLEMENTED;
2138 goto error;
2139 break;
2140 }
2141 i++;
2142 }
2143
2144 ret = nb_event;
2145 *events = tmp;
2146
2147 error:
2148 rcu_read_unlock();
2149 return ret;
2150 }
2151
2152 /*
2153 * Fill lttng_event array of all kernel events in the channel.
2154 */
2155 static int list_lttng_kernel_events(char *channel_name,
2156 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2157 {
2158 int i = 0, ret;
2159 unsigned int nb_event;
2160 struct ltt_kernel_event *event;
2161 struct ltt_kernel_channel *kchan;
2162
2163 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2164 if (kchan == NULL) {
2165 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2166 goto error;
2167 }
2168
2169 nb_event = kchan->event_count;
2170
2171 DBG("Listing events for channel %s", kchan->channel->name);
2172
2173 if (nb_event == 0) {
2174 ret = nb_event;
2175 goto error;
2176 }
2177
2178 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2179 if (*events == NULL) {
2180 ret = LTTCOMM_FATAL;
2181 goto error;
2182 }
2183
2184 /* Kernel channels */
2185 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2186 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2187 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2188 (*events)[i].enabled = event->enabled;
2189 switch (event->event->instrumentation) {
2190 case LTTNG_KERNEL_TRACEPOINT:
2191 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2192 break;
2193 case LTTNG_KERNEL_KPROBE:
2194 case LTTNG_KERNEL_KRETPROBE:
2195 (*events)[i].type = LTTNG_EVENT_PROBE;
2196 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2197 sizeof(struct lttng_kernel_kprobe));
2198 break;
2199 case LTTNG_KERNEL_FUNCTION:
2200 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2201 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2202 sizeof(struct lttng_kernel_function));
2203 break;
2204 case LTTNG_KERNEL_NOOP:
2205 (*events)[i].type = LTTNG_EVENT_NOOP;
2206 break;
2207 case LTTNG_KERNEL_SYSCALL:
2208 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2209 break;
2210 case LTTNG_KERNEL_ALL:
2211 assert(0);
2212 break;
2213 }
2214 i++;
2215 }
2216
2217 return nb_event;
2218
2219 error:
2220 return ret;
2221 }
2222
2223 /*
2224 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2225 */
2226 static int cmd_disable_channel(struct ltt_session *session,
2227 int domain, char *channel_name)
2228 {
2229 int ret;
2230 struct ltt_ust_session *usess;
2231
2232 usess = session->ust_session;
2233
2234 switch (domain) {
2235 case LTTNG_DOMAIN_KERNEL:
2236 {
2237 ret = channel_kernel_disable(session->kernel_session,
2238 channel_name);
2239 if (ret != LTTCOMM_OK) {
2240 goto error;
2241 }
2242
2243 kernel_wait_quiescent(kernel_tracer_fd);
2244 break;
2245 }
2246 case LTTNG_DOMAIN_UST:
2247 {
2248 struct ltt_ust_channel *uchan;
2249
2250 /* Get channel in global UST domain HT */
2251 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2252 channel_name);
2253 if (uchan == NULL) {
2254 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2255 goto error;
2256 }
2257
2258 /* Already disabled */
2259 if (!uchan->enabled) {
2260 DBG2("UST channel %s already disabled", channel_name);
2261 break;
2262 }
2263
2264 ret = ust_app_disable_channel_glb(usess, uchan);
2265 if (ret < 0) {
2266 ret = LTTCOMM_UST_DISABLE_FAIL;
2267 goto error;
2268 }
2269
2270 uchan->enabled = 0;
2271
2272 break;
2273 }
2274 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2275 case LTTNG_DOMAIN_UST_EXEC_NAME:
2276 case LTTNG_DOMAIN_UST_PID:
2277 ret = LTTCOMM_NOT_IMPLEMENTED;
2278 goto error;
2279 default:
2280 ret = LTTCOMM_UNKNOWN_DOMAIN;
2281 goto error;
2282 }
2283
2284 ret = LTTCOMM_OK;
2285
2286 error:
2287 return ret;
2288 }
2289
2290 /*
2291 * Copy channel from attributes and set it in the application channel list.
2292 */
2293 /*
2294 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2295 struct lttng_channel *attr, struct ust_app *app)
2296 {
2297 int ret;
2298 struct ltt_ust_channel *uchan, *new_chan;
2299
2300 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2301 if (uchan == NULL) {
2302 ret = LTTCOMM_FATAL;
2303 goto error;
2304 }
2305
2306 new_chan = trace_ust_create_channel(attr, usess->path);
2307 if (new_chan == NULL) {
2308 PERROR("malloc ltt_ust_channel");
2309 ret = LTTCOMM_FATAL;
2310 goto error;
2311 }
2312
2313 ret = channel_ust_copy(new_chan, uchan);
2314 if (ret < 0) {
2315 ret = LTTCOMM_FATAL;
2316 goto error;
2317 }
2318
2319 error:
2320 return ret;
2321 }
2322 */
2323
2324 /*
2325 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2326 */
2327 static int cmd_enable_channel(struct ltt_session *session,
2328 int domain, struct lttng_channel *attr)
2329 {
2330 int ret;
2331 struct ltt_ust_session *usess = session->ust_session;
2332
2333 DBG("Enabling channel %s for session %s", attr->name, session->name);
2334
2335 switch (domain) {
2336 case LTTNG_DOMAIN_KERNEL:
2337 {
2338 struct ltt_kernel_channel *kchan;
2339
2340 kchan = trace_kernel_get_channel_by_name(attr->name,
2341 session->kernel_session);
2342 if (kchan == NULL) {
2343 ret = channel_kernel_create(session->kernel_session,
2344 attr, kernel_poll_pipe[1]);
2345 } else {
2346 ret = channel_kernel_enable(session->kernel_session, kchan);
2347 }
2348
2349 if (ret != LTTCOMM_OK) {
2350 goto error;
2351 }
2352
2353 kernel_wait_quiescent(kernel_tracer_fd);
2354 break;
2355 }
2356 case LTTNG_DOMAIN_UST:
2357 {
2358 struct ltt_ust_channel *uchan;
2359
2360 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2361
2362 /* Get channel in global UST domain HT */
2363 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2364 attr->name);
2365 if (uchan == NULL) {
2366 uchan = trace_ust_create_channel(attr, usess->pathname);
2367 if (uchan == NULL) {
2368 ret = LTTCOMM_UST_CHAN_FAIL;
2369 goto error;
2370 }
2371
2372 /* Add channel to all registered applications */
2373 ret = ust_app_create_channel_glb(usess, uchan);
2374 if (ret != 0) {
2375 ret = LTTCOMM_UST_CHAN_FAIL;
2376 goto error;
2377 }
2378
2379 rcu_read_lock();
2380 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2381 rcu_read_unlock();
2382
2383 DBG2("UST channel %s added to global domain HT", attr->name);
2384 } else {
2385 /* If already enabled, everything is OK */
2386 if (uchan->enabled) {
2387 break;
2388 }
2389
2390 ret = ust_app_enable_channel_glb(usess, uchan);
2391 if (ret < 0) {
2392 if (ret != -EEXIST) {
2393 ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
2394 goto error;
2395 } else {
2396 ret = LTTCOMM_OK;
2397 }
2398 }
2399 }
2400
2401 uchan->enabled = 1;
2402
2403 break;
2404 }
2405 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2406 case LTTNG_DOMAIN_UST_EXEC_NAME:
2407 case LTTNG_DOMAIN_UST_PID:
2408 ret = LTTCOMM_NOT_IMPLEMENTED;
2409 goto error;
2410 default:
2411 ret = LTTCOMM_UNKNOWN_DOMAIN;
2412 goto error;
2413 }
2414
2415 ret = LTTCOMM_OK;
2416
2417 error:
2418 return ret;
2419 }
2420
2421 /*
2422 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2423 */
2424 static int cmd_disable_event(struct ltt_session *session, int domain,
2425 char *channel_name, char *event_name)
2426 {
2427 int ret;
2428
2429 switch (domain) {
2430 case LTTNG_DOMAIN_KERNEL:
2431 {
2432 struct ltt_kernel_channel *kchan;
2433 struct ltt_kernel_session *ksess;
2434
2435 ksess = session->kernel_session;
2436
2437 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2438 if (kchan == NULL) {
2439 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2440 goto error;
2441 }
2442
2443 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2444 if (ret != LTTCOMM_OK) {
2445 goto error;
2446 }
2447
2448 kernel_wait_quiescent(kernel_tracer_fd);
2449 break;
2450 }
2451 case LTTNG_DOMAIN_UST:
2452 {
2453 struct ltt_ust_session *usess;
2454 struct ltt_ust_channel *uchan;
2455 struct ltt_ust_event *uevent;
2456
2457 usess = session->ust_session;
2458
2459 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2460 channel_name);
2461 if (uchan == NULL) {
2462 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2463 goto error;
2464 }
2465
2466 uevent = trace_ust_find_event_by_name(uchan->events, event_name);
2467 if (uevent == NULL) {
2468 ret = LTTCOMM_UST_EVENT_NOT_FOUND;
2469 goto error;
2470 }
2471
2472 ret = ust_app_disable_event_glb(usess, uchan, uevent);
2473 if (ret < 0) {
2474 ret = LTTCOMM_UST_DISABLE_FAIL;
2475 goto error;
2476 }
2477
2478 uevent->enabled = 0;
2479
2480 DBG2("Disable UST event %s in channel %s completed", event_name,
2481 channel_name);
2482
2483 break;
2484 }
2485 case LTTNG_DOMAIN_UST_EXEC_NAME:
2486 case LTTNG_DOMAIN_UST_PID:
2487 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2488 default:
2489 ret = LTTCOMM_NOT_IMPLEMENTED;
2490 goto error;
2491 }
2492
2493 ret = LTTCOMM_OK;
2494
2495 error:
2496 return ret;
2497 }
2498
2499 /*
2500 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2501 */
2502 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2503 char *channel_name)
2504 {
2505 int ret;
2506
2507 switch (domain) {
2508 case LTTNG_DOMAIN_KERNEL:
2509 {
2510 struct ltt_kernel_session *ksess;
2511 struct ltt_kernel_channel *kchan;
2512
2513 ksess = session->kernel_session;
2514
2515 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2516 if (kchan == NULL) {
2517 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2518 goto error;
2519 }
2520
2521 ret = event_kernel_disable_all(ksess, kchan);
2522 if (ret != LTTCOMM_OK) {
2523 goto error;
2524 }
2525
2526 kernel_wait_quiescent(kernel_tracer_fd);
2527 break;
2528 }
2529 case LTTNG_DOMAIN_UST:
2530 {
2531 struct ltt_ust_session *usess;
2532 struct ltt_ust_channel *uchan;
2533
2534 usess = session->ust_session;
2535
2536 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2537 channel_name);
2538 if (uchan == NULL) {
2539 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2540 goto error;
2541 }
2542
2543 ret = ust_app_disable_all_event_glb(usess, uchan);
2544 if (ret < 0) {
2545 ret = LTTCOMM_UST_DISABLE_FAIL;
2546 goto error;
2547 }
2548
2549 DBG2("Disable all UST event in channel %s completed", channel_name);
2550
2551 break;
2552 }
2553 case LTTNG_DOMAIN_UST_EXEC_NAME:
2554 case LTTNG_DOMAIN_UST_PID:
2555 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2556 default:
2557 ret = LTTCOMM_NOT_IMPLEMENTED;
2558 goto error;
2559 }
2560
2561 ret = LTTCOMM_OK;
2562
2563 error:
2564 return ret;
2565 }
2566
2567 /*
2568 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2569 */
2570 static int cmd_add_context(struct ltt_session *session, int domain,
2571 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2572 {
2573 int ret;
2574
2575 switch (domain) {
2576 case LTTNG_DOMAIN_KERNEL:
2577 /* Add kernel context to kernel tracer */
2578 ret = context_kernel_add(session->kernel_session, ctx,
2579 event_name, channel_name);
2580 if (ret != LTTCOMM_OK) {
2581 goto error;
2582 }
2583 break;
2584 case LTTNG_DOMAIN_UST:
2585 {
2586 struct ltt_ust_session *usess = session->ust_session;
2587
2588 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2589 if (ret != LTTCOMM_OK) {
2590 goto error;
2591 }
2592 break;
2593 }
2594 case LTTNG_DOMAIN_UST_EXEC_NAME:
2595 case LTTNG_DOMAIN_UST_PID:
2596 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2597 default:
2598 ret = LTTCOMM_NOT_IMPLEMENTED;
2599 goto error;
2600 }
2601
2602 ret = LTTCOMM_OK;
2603
2604 error:
2605 return ret;
2606 }
2607
2608 /*
2609 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2610 */
2611 static int cmd_enable_event(struct ltt_session *session, int domain,
2612 char *channel_name, struct lttng_event *event)
2613 {
2614 int ret;
2615 struct lttng_channel *attr;
2616 struct ltt_ust_session *usess = session->ust_session;
2617
2618 switch (domain) {
2619 case LTTNG_DOMAIN_KERNEL:
2620 {
2621 struct ltt_kernel_channel *kchan;
2622
2623 kchan = trace_kernel_get_channel_by_name(channel_name,
2624 session->kernel_session);
2625 if (kchan == NULL) {
2626 attr = channel_new_default_attr(domain);
2627 if (attr == NULL) {
2628 ret = LTTCOMM_FATAL;
2629 goto error;
2630 }
2631 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2632
2633 /* This call will notify the kernel thread */
2634 ret = channel_kernel_create(session->kernel_session,
2635 attr, kernel_poll_pipe[1]);
2636 if (ret != LTTCOMM_OK) {
2637 free(attr);
2638 goto error;
2639 }
2640 free(attr);
2641 }
2642
2643 /* Get the newly created kernel channel pointer */
2644 kchan = trace_kernel_get_channel_by_name(channel_name,
2645 session->kernel_session);
2646 if (kchan == NULL) {
2647 /* This sould not happen... */
2648 ret = LTTCOMM_FATAL;
2649 goto error;
2650 }
2651
2652 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2653 event);
2654 if (ret != LTTCOMM_OK) {
2655 goto error;
2656 }
2657
2658 kernel_wait_quiescent(kernel_tracer_fd);
2659 break;
2660 }
2661 case LTTNG_DOMAIN_UST:
2662 {
2663 struct lttng_channel *attr;
2664 struct ltt_ust_channel *uchan;
2665
2666 /* Get channel from global UST domain */
2667 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2668 channel_name);
2669 if (uchan == NULL) {
2670 /* Create default channel */
2671 attr = channel_new_default_attr(domain);
2672 if (attr == NULL) {
2673 ret = LTTCOMM_FATAL;
2674 goto error;
2675 }
2676 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2677 attr->name[NAME_MAX - 1] = '\0';
2678
2679 /* Use the internal command enable channel */
2680 ret = cmd_enable_channel(session, domain, attr);
2681 if (ret != LTTCOMM_OK) {
2682 free(attr);
2683 goto error;
2684 }
2685 free(attr);
2686
2687 /* Get the newly created channel reference back */
2688 uchan = trace_ust_find_channel_by_name(
2689 usess->domain_global.channels, channel_name);
2690 if (uchan == NULL) {
2691 /* Something is really wrong */
2692 ret = LTTCOMM_FATAL;
2693 goto error;
2694 }
2695 }
2696
2697 /* At this point, the session and channel exist on the tracer */
2698
2699 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2700 if (ret != LTTCOMM_OK) {
2701 goto error;
2702 }
2703 break;
2704 }
2705 case LTTNG_DOMAIN_UST_EXEC_NAME:
2706 case LTTNG_DOMAIN_UST_PID:
2707 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2708 default:
2709 ret = LTTCOMM_NOT_IMPLEMENTED;
2710 goto error;
2711 }
2712
2713 ret = LTTCOMM_OK;
2714
2715 error:
2716 return ret;
2717 }
2718
2719 /*
2720 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2721 */
2722 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2723 char *channel_name, int event_type)
2724 {
2725 int ret;
2726 struct ltt_kernel_channel *kchan;
2727
2728 switch (domain) {
2729 case LTTNG_DOMAIN_KERNEL:
2730 kchan = trace_kernel_get_channel_by_name(channel_name,
2731 session->kernel_session);
2732 if (kchan == NULL) {
2733 /* This call will notify the kernel thread */
2734 ret = channel_kernel_create(session->kernel_session, NULL,
2735 kernel_poll_pipe[1]);
2736 if (ret != LTTCOMM_OK) {
2737 goto error;
2738 }
2739
2740 /* Get the newly created kernel channel pointer */
2741 kchan = trace_kernel_get_channel_by_name(channel_name,
2742 session->kernel_session);
2743 if (kchan == NULL) {
2744 /* This sould not happen... */
2745 ret = LTTCOMM_FATAL;
2746 goto error;
2747 }
2748
2749 }
2750
2751 switch (event_type) {
2752 case LTTNG_KERNEL_SYSCALL:
2753 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2754 kchan, kernel_tracer_fd);
2755 break;
2756 case LTTNG_KERNEL_TRACEPOINT:
2757 /*
2758 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2759 * events already registered to the channel.
2760 */
2761 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2762 kchan, kernel_tracer_fd);
2763 break;
2764 case LTTNG_KERNEL_ALL:
2765 /* Enable syscalls and tracepoints */
2766 ret = event_kernel_enable_all(session->kernel_session,
2767 kchan, kernel_tracer_fd);
2768 break;
2769 default:
2770 ret = LTTCOMM_KERN_ENABLE_FAIL;
2771 goto error;
2772 }
2773
2774 /* Manage return value */
2775 if (ret != LTTCOMM_OK) {
2776 goto error;
2777 }
2778
2779 kernel_wait_quiescent(kernel_tracer_fd);
2780 break;
2781 default:
2782 /* TODO: Userspace tracing */
2783 ret = LTTCOMM_NOT_IMPLEMENTED;
2784 goto error;
2785 }
2786
2787 ret = LTTCOMM_OK;
2788
2789 error:
2790 return ret;
2791 }
2792
2793 /*
2794 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2795 */
2796 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2797 {
2798 int ret;
2799 ssize_t nb_events = 0;
2800
2801 switch (domain) {
2802 case LTTNG_DOMAIN_KERNEL:
2803 nb_events = kernel_list_events(kernel_tracer_fd, events);
2804 if (nb_events < 0) {
2805 ret = LTTCOMM_KERN_LIST_FAIL;
2806 goto error;
2807 }
2808 break;
2809 case LTTNG_DOMAIN_UST:
2810 nb_events = ust_app_list_events(events);
2811 if (nb_events < 0) {
2812 ret = LTTCOMM_UST_LIST_FAIL;
2813 goto error;
2814 }
2815 break;
2816 default:
2817 ret = LTTCOMM_NOT_IMPLEMENTED;
2818 goto error;
2819 }
2820
2821 return nb_events;
2822
2823 error:
2824 /* Return negative value to differentiate return code */
2825 return -ret;
2826 }
2827
2828 /*
2829 * Command LTTNG_START_TRACE processed by the client thread.
2830 */
2831 static int cmd_start_trace(struct ltt_session *session)
2832 {
2833 int ret;
2834 struct ltt_kernel_session *ksession;
2835 struct ltt_ust_session *usess;
2836
2837 /* Short cut */
2838 ksession = session->kernel_session;
2839 usess = session->ust_session;
2840
2841 if (session->enabled)
2842 return LTTCOMM_UST_START_FAIL;
2843 session->enabled = 1;
2844
2845 /* Kernel tracing */
2846 if (ksession != NULL) {
2847 struct ltt_kernel_channel *kchan;
2848
2849 /* Open kernel metadata */
2850 if (ksession->metadata == NULL) {
2851 ret = kernel_open_metadata(ksession, ksession->trace_path);
2852 if (ret < 0) {
2853 ret = LTTCOMM_KERN_META_FAIL;
2854 goto error;
2855 }
2856 }
2857
2858 /* Open kernel metadata stream */
2859 if (ksession->metadata_stream_fd == 0) {
2860 ret = kernel_open_metadata_stream(ksession);
2861 if (ret < 0) {
2862 ERR("Kernel create metadata stream failed");
2863 ret = LTTCOMM_KERN_STREAM_FAIL;
2864 goto error;
2865 }
2866 }
2867
2868 /* For each channel */
2869 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2870 if (kchan->stream_count == 0) {
2871 ret = kernel_open_channel_stream(kchan);
2872 if (ret < 0) {
2873 ret = LTTCOMM_KERN_STREAM_FAIL;
2874 goto error;
2875 }
2876 /* Update the stream global counter */
2877 ksession->stream_count_global += ret;
2878 }
2879 }
2880
2881 /* Setup kernel consumer socket and send fds to it */
2882 ret = init_kernel_tracing(ksession);
2883 if (ret < 0) {
2884 ret = LTTCOMM_KERN_START_FAIL;
2885 goto error;
2886 }
2887
2888 /* This start the kernel tracing */
2889 ret = kernel_start_session(ksession);
2890 if (ret < 0) {
2891 ret = LTTCOMM_KERN_START_FAIL;
2892 goto error;
2893 }
2894
2895 /* Quiescent wait after starting trace */
2896 kernel_wait_quiescent(kernel_tracer_fd);
2897 }
2898
2899 /* Flag session that trace should start automatically */
2900 if (usess) {
2901 usess->start_trace = 1;
2902
2903 ret = ust_app_start_trace_all(usess);
2904 if (ret < 0) {
2905 ret = LTTCOMM_UST_START_FAIL;
2906 goto error;
2907 }
2908 }
2909
2910 ret = LTTCOMM_OK;
2911
2912 error:
2913 return ret;
2914 }
2915
2916 /*
2917 * Command LTTNG_STOP_TRACE processed by the client thread.
2918 */
2919 static int cmd_stop_trace(struct ltt_session *session)
2920 {
2921 int ret;
2922 struct ltt_kernel_channel *kchan;
2923 struct ltt_kernel_session *ksession;
2924 struct ltt_ust_session *usess;
2925
2926 /* Short cut */
2927 ksession = session->kernel_session;
2928 usess = session->ust_session;
2929
2930 if (!session->enabled)
2931 return LTTCOMM_UST_START_FAIL;
2932 session->enabled = 0;
2933
2934 /* Kernel tracer */
2935 if (ksession != NULL) {
2936 DBG("Stop kernel tracing");
2937
2938 /* Flush all buffers before stopping */
2939 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2940 if (ret < 0) {
2941 ERR("Kernel metadata flush failed");
2942 }
2943
2944 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2945 ret = kernel_flush_buffer(kchan);
2946 if (ret < 0) {
2947 ERR("Kernel flush buffer error");
2948 }
2949 }
2950
2951 ret = kernel_stop_session(ksession);
2952 if (ret < 0) {
2953 ret = LTTCOMM_KERN_STOP_FAIL;
2954 goto error;
2955 }
2956
2957 kernel_wait_quiescent(kernel_tracer_fd);
2958 }
2959
2960 if (usess) {
2961 usess->start_trace = 0;
2962
2963 ret = ust_app_stop_trace_all(usess);
2964 if (ret < 0) {
2965 ret = LTTCOMM_UST_START_FAIL;
2966 goto error;
2967 }
2968 }
2969
2970 ret = LTTCOMM_OK;
2971
2972 error:
2973 return ret;
2974 }
2975
2976 /*
2977 * Command LTTNG_CREATE_SESSION processed by the client thread.
2978 */
2979 static int cmd_create_session(char *name, char *path)
2980 {
2981 int ret;
2982
2983 ret = session_create(name, path);
2984 if (ret != LTTCOMM_OK) {
2985 goto error;
2986 }
2987
2988 ret = LTTCOMM_OK;
2989
2990 error:
2991 return ret;
2992 }
2993
2994 /*
2995 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2996 */
2997 static int cmd_destroy_session(struct ltt_session *session, char *name)
2998 {
2999 int ret;
3000
3001 /* Clean kernel session teardown */
3002 teardown_kernel_session(session);
3003 /* UST session teardown */
3004 teardown_ust_session(session);
3005
3006 /*
3007 * Must notify the kernel thread here to update it's poll setin order
3008 * to remove the channel(s)' fd just destroyed.
3009 */
3010 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3011 if (ret < 0) {
3012 perror("write kernel poll pipe");
3013 }
3014
3015 ret = session_destroy(session);
3016
3017 return ret;
3018 }
3019
3020 /*
3021 * Command LTTNG_CALIBRATE processed by the client thread.
3022 */
3023 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3024 {
3025 int ret;
3026
3027 switch (domain) {
3028 case LTTNG_DOMAIN_KERNEL:
3029 {
3030 struct lttng_kernel_calibrate kcalibrate;
3031
3032 kcalibrate.type = calibrate->type;
3033 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3034 if (ret < 0) {
3035 ret = LTTCOMM_KERN_ENABLE_FAIL;
3036 goto error;
3037 }
3038 break;
3039 }
3040 default:
3041 /* TODO: Userspace tracing */
3042 ret = LTTCOMM_NOT_IMPLEMENTED;
3043 goto error;
3044 }
3045
3046 ret = LTTCOMM_OK;
3047
3048 error:
3049 return ret;
3050 }
3051
3052 /*
3053 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3054 */
3055 static int cmd_register_consumer(struct ltt_session *session, int domain,
3056 char *sock_path)
3057 {
3058 int ret, sock;
3059
3060 switch (domain) {
3061 case LTTNG_DOMAIN_KERNEL:
3062 /* Can't register a consumer if there is already one */
3063 if (session->kernel_session->consumer_fd != 0) {
3064 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3065 goto error;
3066 }
3067
3068 sock = lttcomm_connect_unix_sock(sock_path);
3069 if (sock < 0) {
3070 ret = LTTCOMM_CONNECT_FAIL;
3071 goto error;
3072 }
3073
3074 session->kernel_session->consumer_fd = sock;
3075 break;
3076 default:
3077 /* TODO: Userspace tracing */
3078 ret = LTTCOMM_NOT_IMPLEMENTED;
3079 goto error;
3080 }
3081
3082 ret = LTTCOMM_OK;
3083
3084 error:
3085 return ret;
3086 }
3087
3088 /*
3089 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3090 */
3091 static ssize_t cmd_list_domains(struct ltt_session *session,
3092 struct lttng_domain **domains)
3093 {
3094 int ret, index = 0;
3095 ssize_t nb_dom = 0;
3096
3097 if (session->kernel_session != NULL) {
3098 DBG3("Listing domains found kernel domain");
3099 nb_dom++;
3100 }
3101
3102 if (session->ust_session != NULL) {
3103 DBG3("Listing domains found UST global domain");
3104 nb_dom++;
3105 }
3106
3107 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3108 if (*domains == NULL) {
3109 ret = -LTTCOMM_FATAL;
3110 goto error;
3111 }
3112
3113 if (session->kernel_session != NULL) {
3114 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3115 index++;
3116 }
3117
3118 if (session->ust_session != NULL) {
3119 (*domains)[index].type = LTTNG_DOMAIN_UST;
3120 index++;
3121 }
3122
3123 return nb_dom;
3124
3125 error:
3126 return ret;
3127 }
3128
3129 /*
3130 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3131 */
3132 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3133 struct lttng_channel **channels)
3134 {
3135 int ret;
3136 ssize_t nb_chan = 0;
3137
3138 switch (domain) {
3139 case LTTNG_DOMAIN_KERNEL:
3140 if (session->kernel_session != NULL) {
3141 nb_chan = session->kernel_session->channel_count;
3142 }
3143 DBG3("Number of kernel channels %zd", nb_chan);
3144 break;
3145 case LTTNG_DOMAIN_UST:
3146 if (session->ust_session != NULL) {
3147 nb_chan = hashtable_get_count(
3148 session->ust_session->domain_global.channels);
3149 }
3150 DBG3("Number of UST global channels %zd", nb_chan);
3151 break;
3152 default:
3153 *channels = NULL;
3154 ret = -LTTCOMM_NOT_IMPLEMENTED;
3155 goto error;
3156 }
3157
3158 if (nb_chan > 0) {
3159 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3160 if (*channels == NULL) {
3161 ret = -LTTCOMM_FATAL;
3162 goto error;
3163 }
3164
3165 list_lttng_channels(domain, session, *channels);
3166 } else {
3167 *channels = NULL;
3168 }
3169
3170 return nb_chan;
3171
3172 error:
3173 return ret;
3174 }
3175
3176 /*
3177 * Command LTTNG_LIST_EVENTS processed by the client thread.
3178 */
3179 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3180 char *channel_name, struct lttng_event **events)
3181 {
3182 int ret = 0;
3183 ssize_t nb_event = 0;
3184
3185 switch (domain) {
3186 case LTTNG_DOMAIN_KERNEL:
3187 if (session->kernel_session != NULL) {
3188 nb_event = list_lttng_kernel_events(channel_name,
3189 session->kernel_session, events);
3190 }
3191 break;
3192 case LTTNG_DOMAIN_UST:
3193 {
3194 if (session->ust_session != NULL) {
3195 nb_event = list_lttng_ust_global_events(channel_name,
3196 &session->ust_session->domain_global, events);
3197 }
3198 break;
3199 }
3200 default:
3201 ret = -LTTCOMM_NOT_IMPLEMENTED;
3202 goto error;
3203 }
3204
3205 ret = nb_event;
3206
3207 error:
3208 return ret;
3209 }
3210
3211 /*
3212 * Process the command requested by the lttng client within the command
3213 * context structure. This function make sure that the return structure (llm)
3214 * is set and ready for transmission before returning.
3215 *
3216 * Return any error encountered or 0 for success.
3217 */
3218 static int process_client_msg(struct command_ctx *cmd_ctx)
3219 {
3220 int ret = LTTCOMM_OK;
3221 int need_tracing_session = 1;
3222
3223 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3224
3225 /*
3226 * Check for command that don't needs to allocate a returned payload. We do
3227 * this here so we don't have to make the call for no payload at each
3228 * command.
3229 */
3230 switch(cmd_ctx->lsm->cmd_type) {
3231 case LTTNG_LIST_SESSIONS:
3232 case LTTNG_LIST_TRACEPOINTS:
3233 case LTTNG_LIST_DOMAINS:
3234 case LTTNG_LIST_CHANNELS:
3235 case LTTNG_LIST_EVENTS:
3236 break;
3237 default:
3238 /* Setup lttng message with no payload */
3239 ret = setup_lttng_msg(cmd_ctx, 0);
3240 if (ret < 0) {
3241 /* This label does not try to unlock the session */
3242 goto init_setup_error;
3243 }
3244 }
3245
3246 /* Commands that DO NOT need a session. */
3247 switch (cmd_ctx->lsm->cmd_type) {
3248 case LTTNG_CALIBRATE:
3249 case LTTNG_CREATE_SESSION:
3250 case LTTNG_LIST_SESSIONS:
3251 case LTTNG_LIST_TRACEPOINTS:
3252 need_tracing_session = 0;
3253 break;
3254 default:
3255 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3256 session_lock_list();
3257 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3258 session_unlock_list();
3259 if (cmd_ctx->session == NULL) {
3260 if (cmd_ctx->lsm->session.name != NULL) {
3261 ret = LTTCOMM_SESS_NOT_FOUND;
3262 } else {
3263 /* If no session name specified */
3264 ret = LTTCOMM_SELECT_SESS;
3265 }
3266 goto error;
3267 } else {
3268 /* Acquire lock for the session */
3269 session_lock(cmd_ctx->session);
3270 }
3271 break;
3272 }
3273
3274 /*
3275 * Check domain type for specific "pre-action".
3276 */
3277 switch (cmd_ctx->lsm->domain.type) {
3278 case LTTNG_DOMAIN_KERNEL:
3279 /* Kernel tracer check */
3280 if (kernel_tracer_fd == 0) {
3281 /* Basically, load kernel tracer modules */
3282 init_kernel_tracer();
3283 if (kernel_tracer_fd == 0) {
3284 ret = LTTCOMM_KERN_NA;
3285 goto error;
3286 }
3287 }
3288
3289 /* Need a session for kernel command */
3290 if (need_tracing_session) {
3291 if (cmd_ctx->session->kernel_session == NULL) {
3292 ret = create_kernel_session(cmd_ctx->session);
3293 if (ret < 0) {
3294 ret = LTTCOMM_KERN_SESS_FAIL;
3295 goto error;
3296 }
3297 }
3298
3299 /* Start the kernel consumer daemon */
3300 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3301 if (kconsumer_data.pid == 0 &&
3302 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3303 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3304 ret = start_consumerd(&kconsumer_data);
3305 if (ret < 0) {
3306 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3307 goto error;
3308 }
3309 } else {
3310 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3311 }
3312 }
3313 break;
3314 case LTTNG_DOMAIN_UST:
3315 {
3316 if (need_tracing_session) {
3317 if (cmd_ctx->session->ust_session == NULL) {
3318 ret = create_ust_session(cmd_ctx->session,
3319 &cmd_ctx->lsm->domain);
3320 if (ret != LTTCOMM_OK) {
3321 goto error;
3322 }
3323 }
3324 /* Start the UST consumer daemons */
3325 /* 64-bit */
3326 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3327 if (consumerd64_path[0] != '\0' &&
3328 ustconsumer64_data.pid == 0 &&
3329 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3330 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3331 ret = start_consumerd(&ustconsumer64_data);
3332 if (ret < 0) {
3333 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3334 ust_consumerd64_fd = -EINVAL;
3335 goto error;
3336 }
3337
3338 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3339 } else {
3340 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3341 }
3342 /* 32-bit */
3343 if (consumerd32_path[0] != '\0' &&
3344 ustconsumer32_data.pid == 0 &&
3345 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3346 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3347 ret = start_consumerd(&ustconsumer32_data);
3348 if (ret < 0) {
3349 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3350 ust_consumerd32_fd = -EINVAL;
3351 goto error;
3352 }
3353 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3354 } else {
3355 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3356 }
3357 }
3358 break;
3359 }
3360 default:
3361 break;
3362 }
3363
3364 /* Process by command type */
3365 switch (cmd_ctx->lsm->cmd_type) {
3366 case LTTNG_ADD_CONTEXT:
3367 {
3368 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3369 cmd_ctx->lsm->u.context.channel_name,
3370 cmd_ctx->lsm->u.context.event_name,
3371 &cmd_ctx->lsm->u.context.ctx);
3372 break;
3373 }
3374 case LTTNG_DISABLE_CHANNEL:
3375 {
3376 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3377 cmd_ctx->lsm->u.disable.channel_name);
3378 break;
3379 }
3380 case LTTNG_DISABLE_EVENT:
3381 {
3382 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3383 cmd_ctx->lsm->u.disable.channel_name,
3384 cmd_ctx->lsm->u.disable.name);
3385 ret = LTTCOMM_OK;
3386 break;
3387 }
3388 case LTTNG_DISABLE_ALL_EVENT:
3389 {
3390 DBG("Disabling all events");
3391
3392 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3393 cmd_ctx->lsm->u.disable.channel_name);
3394 break;
3395 }
3396 case LTTNG_ENABLE_CHANNEL:
3397 {
3398 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3399 &cmd_ctx->lsm->u.channel.chan);
3400 break;
3401 }
3402 case LTTNG_ENABLE_EVENT:
3403 {
3404 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3405 cmd_ctx->lsm->u.enable.channel_name,
3406 &cmd_ctx->lsm->u.enable.event);
3407 break;
3408 }
3409 case LTTNG_ENABLE_ALL_EVENT:
3410 {
3411 DBG("Enabling all events");
3412
3413 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3414 cmd_ctx->lsm->u.enable.channel_name,
3415 cmd_ctx->lsm->u.enable.event.type);
3416 break;
3417 }
3418 case LTTNG_LIST_TRACEPOINTS:
3419 {
3420 struct lttng_event *events;
3421 ssize_t nb_events;
3422
3423 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3424 if (nb_events < 0) {
3425 ret = -nb_events;
3426 goto error;
3427 }
3428
3429 /*
3430 * Setup lttng message with payload size set to the event list size in
3431 * bytes and then copy list into the llm payload.
3432 */
3433 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3434 if (ret < 0) {
3435 free(events);
3436 goto setup_error;
3437 }
3438
3439 /* Copy event list into message payload */
3440 memcpy(cmd_ctx->llm->payload, events,
3441 sizeof(struct lttng_event) * nb_events);
3442
3443 free(events);
3444
3445 ret = LTTCOMM_OK;
3446 break;
3447 }
3448 case LTTNG_START_TRACE:
3449 {
3450 ret = cmd_start_trace(cmd_ctx->session);
3451 break;
3452 }
3453 case LTTNG_STOP_TRACE:
3454 {
3455 ret = cmd_stop_trace(cmd_ctx->session);
3456 break;
3457 }
3458 case LTTNG_CREATE_SESSION:
3459 {
3460 tracepoint(create_session_start);
3461 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3462 cmd_ctx->lsm->session.path);
3463 tracepoint(create_session_end);
3464 break;
3465 }
3466 case LTTNG_DESTROY_SESSION:
3467 {
3468 tracepoint(destroy_session_start);
3469 ret = cmd_destroy_session(cmd_ctx->session,
3470 cmd_ctx->lsm->session.name);
3471 tracepoint(destroy_session_end);
3472 break;
3473 }
3474 case LTTNG_LIST_DOMAINS:
3475 {
3476 ssize_t nb_dom;
3477 struct lttng_domain *domains;
3478
3479 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3480 if (nb_dom < 0) {
3481 ret = -nb_dom;
3482 goto error;
3483 }
3484
3485 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3486 if (ret < 0) {
3487 goto setup_error;
3488 }
3489
3490 /* Copy event list into message payload */
3491 memcpy(cmd_ctx->llm->payload, domains,
3492 nb_dom * sizeof(struct lttng_domain));
3493
3494 free(domains);
3495
3496 ret = LTTCOMM_OK;
3497 break;
3498 }
3499 case LTTNG_LIST_CHANNELS:
3500 {
3501 size_t nb_chan;
3502 struct lttng_channel *channels;
3503
3504 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3505 cmd_ctx->session, &channels);
3506 if (nb_chan < 0) {
3507 ret = -nb_chan;
3508 goto error;
3509 }
3510
3511 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3512 if (ret < 0) {
3513 goto setup_error;
3514 }
3515
3516 /* Copy event list into message payload */
3517 memcpy(cmd_ctx->llm->payload, channels,
3518 nb_chan * sizeof(struct lttng_channel));
3519
3520 free(channels);
3521
3522 ret = LTTCOMM_OK;
3523 break;
3524 }
3525 case LTTNG_LIST_EVENTS:
3526 {
3527 ssize_t nb_event;
3528 struct lttng_event *events = NULL;
3529
3530 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3531 cmd_ctx->lsm->u.list.channel_name, &events);
3532 if (nb_event < 0) {
3533 ret = -nb_event;
3534 goto error;
3535 }
3536
3537 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3538 if (ret < 0) {
3539 goto setup_error;
3540 }
3541
3542 /* Copy event list into message payload */
3543 memcpy(cmd_ctx->llm->payload, events,
3544 nb_event * sizeof(struct lttng_event));
3545
3546 free(events);
3547
3548 ret = LTTCOMM_OK;
3549 break;
3550 }
3551 case LTTNG_LIST_SESSIONS:
3552 {
3553 session_lock_list();
3554
3555 if (session_list_ptr->count == 0) {
3556 ret = LTTCOMM_NO_SESSION;
3557 session_unlock_list();
3558 goto error;
3559 }
3560
3561 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3562 session_list_ptr->count);
3563 if (ret < 0) {
3564 session_unlock_list();
3565 goto setup_error;
3566 }
3567
3568 /* Filled the session array */
3569 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3570
3571 session_unlock_list();
3572
3573 ret = LTTCOMM_OK;
3574 break;
3575 }
3576 case LTTNG_CALIBRATE:
3577 {
3578 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3579 &cmd_ctx->lsm->u.calibrate);
3580 break;
3581 }
3582 case LTTNG_REGISTER_CONSUMER:
3583 {
3584 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3585 cmd_ctx->lsm->u.reg.path);
3586 break;
3587 }
3588 default:
3589 ret = LTTCOMM_UND;
3590 break;
3591 }
3592
3593 error:
3594 if (cmd_ctx->llm == NULL) {
3595 DBG("Missing llm structure. Allocating one.");
3596 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3597 goto setup_error;
3598 }
3599 }
3600 /* Set return code */
3601 cmd_ctx->llm->ret_code = ret;
3602 setup_error:
3603 if (cmd_ctx->session) {
3604 session_unlock(cmd_ctx->session);
3605 }
3606 init_setup_error:
3607 return ret;
3608 }
3609
3610 /*
3611 * This thread manage all clients request using the unix client socket for
3612 * communication.
3613 */
3614 static void *thread_manage_clients(void *data)
3615 {
3616 int sock = 0, ret, i, pollfd;
3617 uint32_t revents, nb_fd;
3618 struct command_ctx *cmd_ctx = NULL;
3619 struct lttng_poll_event events;
3620
3621 tracepoint(sessiond_th_cli_start);
3622
3623 DBG("[thread] Manage client started");
3624
3625 rcu_register_thread();
3626
3627 ret = lttcomm_listen_unix_sock(client_sock);
3628 if (ret < 0) {
3629 goto error;
3630 }
3631
3632 /*
3633 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3634 * more will be added to this poll set.
3635 */
3636 ret = create_thread_poll_set(&events, 2);
3637 if (ret < 0) {
3638 goto error;
3639 }
3640
3641 /* Add the application registration socket */
3642 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3643 if (ret < 0) {
3644 goto error;
3645 }
3646
3647 /*
3648 * Notify parent pid that we are ready to accept command for client side.
3649 */
3650 if (opt_sig_parent) {
3651 kill(ppid, SIGCHLD);
3652 }
3653
3654 while (1) {
3655 DBG("Accepting client command ...");
3656
3657 tracepoint(sessiond_th_cli_poll);
3658
3659 nb_fd = LTTNG_POLL_GETNB(&events);
3660
3661 /* Inifinite blocking call, waiting for transmission */
3662 ret = lttng_poll_wait(&events, -1);
3663 if (ret < 0) {
3664 goto error;
3665 }
3666
3667 for (i = 0; i < nb_fd; i++) {
3668 /* Fetch once the poll data */
3669 revents = LTTNG_POLL_GETEV(&events, i);
3670 pollfd = LTTNG_POLL_GETFD(&events, i);
3671
3672 /* Thread quit pipe has been closed. Killing thread. */
3673 ret = check_thread_quit_pipe(pollfd, revents);
3674 if (ret) {
3675 goto error;
3676 }
3677
3678 /* Event on the registration socket */
3679 if (pollfd == client_sock) {
3680 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3681 ERR("Client socket poll error");
3682 goto error;
3683 }
3684 }
3685 }
3686
3687 DBG("Wait for client response");
3688
3689 sock = lttcomm_accept_unix_sock(client_sock);
3690 if (sock < 0) {
3691 goto error;
3692 }
3693
3694 /* Allocate context command to process the client request */
3695 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3696 if (cmd_ctx == NULL) {
3697 perror("zmalloc cmd_ctx");
3698 goto error;
3699 }
3700
3701 /* Allocate data buffer for reception */
3702 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3703 if (cmd_ctx->lsm == NULL) {
3704 perror("zmalloc cmd_ctx->lsm");
3705 goto error;
3706 }
3707
3708 cmd_ctx->llm = NULL;
3709 cmd_ctx->session = NULL;
3710
3711 /*
3712 * Data is received from the lttng client. The struct
3713 * lttcomm_session_msg (lsm) contains the command and data request of
3714 * the client.
3715 */
3716 DBG("Receiving data from client ...");
3717 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3718 sizeof(struct lttcomm_session_msg));
3719 if (ret <= 0) {
3720 DBG("Nothing recv() from client... continuing");
3721 close(sock);
3722 free(cmd_ctx);
3723 continue;
3724 }
3725
3726 // TODO: Validate cmd_ctx including sanity check for
3727 // security purpose.
3728
3729 rcu_thread_online();
3730 /*
3731 * This function dispatch the work to the kernel or userspace tracer
3732 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3733 * informations for the client. The command context struct contains
3734 * everything this function may needs.
3735 */
3736 ret = process_client_msg(cmd_ctx);
3737 rcu_thread_offline();
3738 if (ret < 0) {
3739 /*
3740 * TODO: Inform client somehow of the fatal error. At
3741 * this point, ret < 0 means that a zmalloc failed
3742 * (ENOMEM). Error detected but still accept command.
3743 */
3744 clean_command_ctx(&cmd_ctx);
3745 continue;
3746 }
3747
3748 DBG("Sending response (size: %d, retcode: %s)",
3749 cmd_ctx->lttng_msg_size,
3750 lttng_strerror(-cmd_ctx->llm->ret_code));
3751 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3752 if (ret < 0) {
3753 ERR("Failed to send data back to client");
3754 }
3755
3756 clean_command_ctx(&cmd_ctx);
3757
3758 /* End of transmission */
3759 close(sock);
3760 }
3761
3762 error:
3763 DBG("Client thread dying");
3764 unlink(client_unix_sock_path);
3765 close(client_sock);
3766 close(sock);
3767
3768 lttng_poll_clean(&events);
3769 clean_command_ctx(&cmd_ctx);
3770
3771 rcu_unregister_thread();
3772 return NULL;
3773 }
3774
3775
3776 /*
3777 * usage function on stderr
3778 */
3779 static void usage(void)
3780 {
3781 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3782 fprintf(stderr, " -h, --help Display this usage.\n");
3783 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3784 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3785 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3786 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3787 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3788 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3789 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3790 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3791 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3792 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3793 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3794 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3795 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3796 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3797 fprintf(stderr, " -V, --version Show version number.\n");
3798 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3799 fprintf(stderr, " -q, --quiet No output at all.\n");
3800 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3801 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3802 }
3803
3804 /*
3805 * daemon argument parsing
3806 */
3807 static int parse_args(int argc, char **argv)
3808 {
3809 int c;
3810
3811 static struct option long_options[] = {
3812 { "client-sock", 1, 0, 'c' },
3813 { "apps-sock", 1, 0, 'a' },
3814 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3815 { "kconsumerd-err-sock", 1, 0, 'E' },
3816 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3817 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3818 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3819 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3820 { "consumerd32-path", 1, 0, 'u' },
3821 { "consumerd32-libdir", 1, 0, 'U' },
3822 { "consumerd64-path", 1, 0, 't' },
3823 { "consumerd64-libdir", 1, 0, 'T' },
3824 { "daemonize", 0, 0, 'd' },
3825 { "sig-parent", 0, 0, 'S' },
3826 { "help", 0, 0, 'h' },
3827 { "group", 1, 0, 'g' },
3828 { "version", 0, 0, 'V' },
3829 { "quiet", 0, 0, 'q' },
3830 { "verbose", 0, 0, 'v' },
3831 { "verbose-consumer", 0, 0, 'Z' },
3832 { NULL, 0, 0, 0 }
3833 };
3834
3835 while (1) {
3836 int option_index = 0;
3837 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3838 long_options, &option_index);
3839 if (c == -1) {
3840 break;
3841 }
3842
3843 switch (c) {
3844 case 0:
3845 fprintf(stderr, "option %s", long_options[option_index].name);
3846 if (optarg) {
3847 fprintf(stderr, " with arg %s\n", optarg);
3848 }
3849 break;
3850 case 'c':
3851 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3852 break;
3853 case 'a':
3854 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3855 break;
3856 case 'd':
3857 opt_daemon = 1;
3858 break;
3859 case 'g':
3860 opt_tracing_group = optarg;
3861 break;
3862 case 'h':
3863 usage();
3864 exit(EXIT_FAILURE);
3865 case 'V':
3866 fprintf(stdout, "%s\n", VERSION);
3867 exit(EXIT_SUCCESS);
3868 case 'S':
3869 opt_sig_parent = 1;
3870 break;
3871 case 'E':
3872 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3873 break;
3874 case 'C':
3875 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3876 break;
3877 case 'F':
3878 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3879 break;
3880 case 'D':
3881 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3882 break;
3883 case 'H':
3884 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3885 break;
3886 case 'G':
3887 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3888 break;
3889 case 'q':
3890 opt_quiet = 1;
3891 break;
3892 case 'v':
3893 /* Verbose level can increase using multiple -v */
3894 opt_verbose += 1;
3895 break;
3896 case 'Z':
3897 opt_verbose_consumer += 1;
3898 break;
3899 case 'u':
3900 consumerd32_path= optarg;
3901 break;
3902 case 'U':
3903 consumerd32_libdir = optarg;
3904 break;
3905 case 't':
3906 consumerd64_path = optarg;
3907 break;
3908 case 'T':
3909 consumerd64_libdir = optarg;
3910 break;
3911 default:
3912 /* Unknown option or other error.
3913 * Error is printed by getopt, just return */
3914 return -1;
3915 }
3916 }
3917
3918 return 0;
3919 }
3920
3921 /*
3922 * Creates the two needed socket by the daemon.
3923 * apps_sock - The communication socket for all UST apps.
3924 * client_sock - The communication of the cli tool (lttng).
3925 */
3926 static int init_daemon_socket(void)
3927 {
3928 int ret = 0;
3929 mode_t old_umask;
3930
3931 old_umask = umask(0);
3932
3933 /* Create client tool unix socket */
3934 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3935 if (client_sock < 0) {
3936 ERR("Create unix sock failed: %s", client_unix_sock_path);
3937 ret = -1;
3938 goto end;
3939 }
3940
3941 /* File permission MUST be 660 */
3942 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3943 if (ret < 0) {
3944 ERR("Set file permissions failed: %s", client_unix_sock_path);
3945 perror("chmod");
3946 goto end;
3947 }
3948
3949 /* Create the application unix socket */
3950 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3951 if (apps_sock < 0) {
3952 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3953 ret = -1;
3954 goto end;
3955 }
3956
3957 /* File permission MUST be 666 */
3958 ret = chmod(apps_unix_sock_path,
3959 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3960 if (ret < 0) {
3961 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3962 perror("chmod");
3963 goto end;
3964 }
3965
3966 end:
3967 umask(old_umask);
3968 return ret;
3969 }
3970
3971 /*
3972 * Check if the global socket is available, and if a daemon is answering at the
3973 * other side. If yes, error is returned.
3974 */
3975 static int check_existing_daemon(void)
3976 {
3977 if (access(client_unix_sock_path, F_OK) < 0 &&
3978 access(apps_unix_sock_path, F_OK) < 0) {
3979 return 0;
3980 }
3981
3982 /* Is there anybody out there ? */
3983 if (lttng_session_daemon_alive()) {
3984 return -EEXIST;
3985 } else {
3986 return 0;
3987 }
3988 }
3989
3990 /*
3991 * Set the tracing group gid onto the client socket.
3992 *
3993 * Race window between mkdir and chown is OK because we are going from more
3994 * permissive (root.root) to les permissive (root.tracing).
3995 */
3996 static int set_permissions(void)
3997 {
3998 int ret;
3999 gid_t gid;
4000
4001 gid = allowed_group();
4002 if (gid < 0) {
4003 if (is_root) {
4004 WARN("No tracing group detected");
4005 ret = 0;
4006 } else {
4007 ERR("Missing tracing group. Aborting execution.");
4008 ret = -1;
4009 }
4010 goto end;
4011 }
4012
4013 /* Set lttng run dir */
4014 ret = chown(LTTNG_RUNDIR, 0, gid);
4015 if (ret < 0) {
4016 ERR("Unable to set group on " LTTNG_RUNDIR);
4017 perror("chown");
4018 }
4019
4020 /* lttng client socket path */
4021 ret = chown(client_unix_sock_path, 0, gid);
4022 if (ret < 0) {
4023 ERR("Unable to set group on %s", client_unix_sock_path);
4024 perror("chown");
4025 }
4026
4027 /* kconsumer error socket path */
4028 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4029 if (ret < 0) {
4030 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4031 perror("chown");
4032 }
4033
4034 /* 64-bit ustconsumer error socket path */
4035 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4036 if (ret < 0) {
4037 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4038 perror("chown");
4039 }
4040
4041 /* 32-bit ustconsumer compat32 error socket path */
4042 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4043 if (ret < 0) {
4044 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4045 perror("chown");
4046 }
4047
4048 DBG("All permissions are set");
4049
4050 end:
4051 return ret;
4052 }
4053
4054 /*
4055 * Create the pipe used to wake up the kernel thread.
4056 */
4057 static int create_kernel_poll_pipe(void)
4058 {
4059 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4060 }
4061
4062 /*
4063 * Create the application command pipe to wake thread_manage_apps.
4064 */
4065 static int create_apps_cmd_pipe(void)
4066 {
4067 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4068 }
4069
4070 /*
4071 * Create the lttng run directory needed for all global sockets and pipe.
4072 */
4073 static int create_lttng_rundir(void)
4074 {
4075 int ret;
4076
4077 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
4078 if (ret < 0) {
4079 if (errno != EEXIST) {
4080 ERR("Unable to create " LTTNG_RUNDIR);
4081 goto error;
4082 } else {
4083 ret = 0;
4084 }
4085 }
4086
4087 error:
4088 return ret;
4089 }
4090
4091 /*
4092 * Setup sockets and directory needed by the kconsumerd communication with the
4093 * session daemon.
4094 */
4095 static int set_consumer_sockets(struct consumer_data *consumer_data)
4096 {
4097 int ret;
4098 const char *path;
4099
4100 switch (consumer_data->type) {
4101 case LTTNG_CONSUMER_KERNEL:
4102 path = KCONSUMERD_PATH;
4103 break;
4104 case LTTNG_CONSUMER64_UST:
4105 path = USTCONSUMERD64_PATH;
4106 break;
4107 case LTTNG_CONSUMER32_UST:
4108 path = USTCONSUMERD32_PATH;
4109 break;
4110 default:
4111 ERR("Consumer type unknown");
4112 ret = -EINVAL;
4113 goto error;
4114 }
4115
4116 ret = mkdir(path, S_IRWXU | S_IRWXG);
4117 if (ret < 0) {
4118 if (errno != EEXIST) {
4119 ERR("Failed to create %s", path);
4120 goto error;
4121 }
4122 ret = 0;
4123 }
4124
4125 /* Create the kconsumerd error unix socket */
4126 consumer_data->err_sock =
4127 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4128 if (consumer_data->err_sock < 0) {
4129 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4130 ret = -1;
4131 goto error;
4132 }
4133
4134 /* File permission MUST be 660 */
4135 ret = chmod(consumer_data->err_unix_sock_path,
4136 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4137 if (ret < 0) {
4138 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4139 perror("chmod");
4140 goto error;
4141 }
4142
4143 error:
4144 return ret;
4145 }
4146
4147 /*
4148 * Signal handler for the daemon
4149 *
4150 * Simply stop all worker threads, leaving main() return gracefully after
4151 * joining all threads and calling cleanup().
4152 */
4153 static void sighandler(int sig)
4154 {
4155 switch (sig) {
4156 case SIGPIPE:
4157 DBG("SIGPIPE catched");
4158 return;
4159 case SIGINT:
4160 DBG("SIGINT catched");
4161 stop_threads();
4162 break;
4163 case SIGTERM:
4164 DBG("SIGTERM catched");
4165 stop_threads();
4166 break;
4167 default:
4168 break;
4169 }
4170 }
4171
4172 /*
4173 * Setup signal handler for :
4174 * SIGINT, SIGTERM, SIGPIPE
4175 */
4176 static int set_signal_handler(void)
4177 {
4178 int ret = 0;
4179 struct sigaction sa;
4180 sigset_t sigset;
4181
4182 if ((ret = sigemptyset(&sigset)) < 0) {
4183 perror("sigemptyset");
4184 return ret;
4185 }
4186
4187 sa.sa_handler = sighandler;
4188 sa.sa_mask = sigset;
4189 sa.sa_flags = 0;
4190 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4191 perror("sigaction");
4192 return ret;
4193 }
4194
4195 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4196 perror("sigaction");
4197 return ret;
4198 }
4199
4200 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4201 perror("sigaction");
4202 return ret;
4203 }
4204
4205 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4206
4207 return ret;
4208 }
4209
4210 /*
4211 * Set open files limit to unlimited. This daemon can open a large number of
4212 * file descriptors in order to consumer multiple kernel traces.
4213 */
4214 static void set_ulimit(void)
4215 {
4216 int ret;
4217 struct rlimit lim;
4218
4219 /* The kernel does not allowed an infinite limit for open files */
4220 lim.rlim_cur = 65535;
4221 lim.rlim_max = 65535;
4222
4223 ret = setrlimit(RLIMIT_NOFILE, &lim);
4224 if (ret < 0) {
4225 perror("failed to set open files limit");
4226 }
4227 }
4228
4229 /*
4230 * main
4231 */
4232 int main(int argc, char **argv)
4233 {
4234 int ret = 0;
4235 void *status;
4236 const char *home_path;
4237
4238 tracepoint(sessiond_boot_start);
4239 rcu_register_thread();
4240
4241 /* Create thread quit pipe */
4242 if ((ret = init_thread_quit_pipe()) < 0) {
4243 goto error;
4244 }
4245
4246 setup_consumerd_path();
4247
4248 /* Parse arguments */
4249 progname = argv[0];
4250 if ((ret = parse_args(argc, argv) < 0)) {
4251 goto error;
4252 }
4253
4254 /* Daemonize */
4255 if (opt_daemon) {
4256 ret = daemon(0, 0);
4257 if (ret < 0) {
4258 perror("daemon");
4259 goto error;
4260 }
4261 }
4262
4263 /* Check if daemon is UID = 0 */
4264 is_root = !getuid();
4265
4266 if (is_root) {
4267 ret = create_lttng_rundir();
4268 if (ret < 0) {
4269 goto error;
4270 }
4271
4272 if (strlen(apps_unix_sock_path) == 0) {
4273 snprintf(apps_unix_sock_path, PATH_MAX,
4274 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4275 }
4276
4277 if (strlen(client_unix_sock_path) == 0) {
4278 snprintf(client_unix_sock_path, PATH_MAX,
4279 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4280 }
4281
4282 /* Set global SHM for ust */
4283 if (strlen(wait_shm_path) == 0) {
4284 snprintf(wait_shm_path, PATH_MAX,
4285 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4286 }
4287 } else {
4288 home_path = get_home_dir();
4289 if (home_path == NULL) {
4290 /* TODO: Add --socket PATH option */
4291 ERR("Can't get HOME directory for sockets creation.");
4292 ret = -EPERM;
4293 goto error;
4294 }
4295
4296 if (strlen(apps_unix_sock_path) == 0) {
4297 snprintf(apps_unix_sock_path, PATH_MAX,
4298 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4299 }
4300
4301 /* Set the cli tool unix socket path */
4302 if (strlen(client_unix_sock_path) == 0) {
4303 snprintf(client_unix_sock_path, PATH_MAX,
4304 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4305 }
4306
4307 /* Set global SHM for ust */
4308 if (strlen(wait_shm_path) == 0) {
4309 snprintf(wait_shm_path, PATH_MAX,
4310 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4311 }
4312 }
4313
4314 DBG("Client socket path %s", client_unix_sock_path);
4315 DBG("Application socket path %s", apps_unix_sock_path);
4316
4317 /*
4318 * See if daemon already exist.
4319 */
4320 if ((ret = check_existing_daemon()) < 0) {
4321 ERR("Already running daemon.\n");
4322 /*
4323 * We do not goto exit because we must not cleanup()
4324 * because a daemon is already running.
4325 */
4326 goto error;
4327 }
4328
4329 /* After this point, we can safely call cleanup() with "goto exit" */
4330
4331 /*
4332 * These actions must be executed as root. We do that *after* setting up
4333 * the sockets path because we MUST make the check for another daemon using
4334 * those paths *before* trying to set the kernel consumer sockets and init
4335 * kernel tracer.
4336 */
4337 if (is_root) {
4338 ret = set_consumer_sockets(&kconsumer_data);
4339 if (ret < 0) {
4340 goto exit;
4341 }
4342
4343 ret = set_consumer_sockets(&ustconsumer64_data);
4344 if (ret < 0) {
4345 goto exit;
4346 }
4347
4348 ret = set_consumer_sockets(&ustconsumer32_data);
4349 if (ret < 0) {
4350 goto exit;
4351 }
4352
4353 /* Setup kernel tracer */
4354 init_kernel_tracer();
4355
4356 /* Set ulimit for open files */
4357 set_ulimit();
4358 }
4359
4360 if ((ret = set_signal_handler()) < 0) {
4361 goto exit;
4362 }
4363
4364 /* Setup the needed unix socket */
4365 if ((ret = init_daemon_socket()) < 0) {
4366 goto exit;
4367 }
4368
4369 /* Set credentials to socket */
4370 if (is_root && ((ret = set_permissions()) < 0)) {
4371 goto exit;
4372 }
4373
4374 /* Get parent pid if -S, --sig-parent is specified. */
4375 if (opt_sig_parent) {
4376 ppid = getppid();
4377 }
4378
4379 /* Setup the kernel pipe for waking up the kernel thread */
4380 if ((ret = create_kernel_poll_pipe()) < 0) {
4381 goto exit;
4382 }
4383
4384 /* Setup the thread apps communication pipe. */
4385 if ((ret = create_apps_cmd_pipe()) < 0) {
4386 goto exit;
4387 }
4388
4389 /* Init UST command queue. */
4390 cds_wfq_init(&ust_cmd_queue.queue);
4391
4392 /* Init UST app hash table */
4393 ust_app_ht_alloc();
4394
4395 /*
4396 * Get session list pointer. This pointer MUST NOT be free(). This list is
4397 * statically declared in session.c
4398 */
4399 session_list_ptr = session_get_list();
4400
4401 /* Set up max poll set size */
4402 lttng_poll_set_max_size();
4403
4404 /* Create thread to manage the client socket */
4405 ret = pthread_create(&client_thread, NULL,
4406 thread_manage_clients, (void *) NULL);
4407 if (ret != 0) {
4408 perror("pthread_create clients");
4409 goto exit_client;
4410 }
4411
4412 /* Create thread to dispatch registration */
4413 ret = pthread_create(&dispatch_thread, NULL,
4414 thread_dispatch_ust_registration, (void *) NULL);
4415 if (ret != 0) {
4416 perror("pthread_create dispatch");
4417 goto exit_dispatch;
4418 }
4419
4420 /* Create thread to manage application registration. */
4421 ret = pthread_create(&reg_apps_thread, NULL,
4422 thread_registration_apps, (void *) NULL);
4423 if (ret != 0) {
4424 perror("pthread_create registration");
4425 goto exit_reg_apps;
4426 }
4427
4428 /* Create thread to manage application socket */
4429 ret = pthread_create(&apps_thread, NULL,
4430 thread_manage_apps, (void *) NULL);
4431 if (ret != 0) {
4432 perror("pthread_create apps");
4433 goto exit_apps;
4434 }
4435
4436 /* Create kernel thread to manage kernel event */
4437 ret = pthread_create(&kernel_thread, NULL,
4438 thread_manage_kernel, (void *) NULL);
4439 if (ret != 0) {
4440 perror("pthread_create kernel");
4441 goto exit_kernel;
4442 }
4443
4444 tracepoint(sessiond_boot_end);
4445
4446 ret = pthread_join(kernel_thread, &status);
4447 if (ret != 0) {
4448 perror("pthread_join");
4449 goto error; /* join error, exit without cleanup */
4450 }
4451
4452 exit_kernel:
4453 ret = pthread_join(apps_thread, &status);
4454 if (ret != 0) {
4455 perror("pthread_join");
4456 goto error; /* join error, exit without cleanup */
4457 }
4458
4459 exit_apps:
4460 ret = pthread_join(reg_apps_thread, &status);
4461 if (ret != 0) {
4462 perror("pthread_join");
4463 goto error; /* join error, exit without cleanup */
4464 }
4465
4466 exit_reg_apps:
4467 ret = pthread_join(dispatch_thread, &status);
4468 if (ret != 0) {
4469 perror("pthread_join");
4470 goto error; /* join error, exit without cleanup */
4471 }
4472
4473 exit_dispatch:
4474 ret = pthread_join(client_thread, &status);
4475 if (ret != 0) {
4476 perror("pthread_join");
4477 goto error; /* join error, exit without cleanup */
4478 }
4479
4480 ret = join_consumer_thread(&kconsumer_data);
4481 if (ret != 0) {
4482 perror("join_consumer");
4483 goto error; /* join error, exit without cleanup */
4484 }
4485
4486 exit_client:
4487 exit:
4488 /*
4489 * cleanup() is called when no other thread is running.
4490 */
4491 rcu_thread_online();
4492 cleanup();
4493 rcu_thread_offline();
4494 rcu_unregister_thread();
4495 if (!ret)
4496 exit(EXIT_SUCCESS);
4497 error:
4498 exit(EXIT_FAILURE);
4499 }
LTTng 2.0 tools and control repository
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