projects / lttng-tools.git / blob
? search:


f4f69969b8ce926c20d360f995fa4932e464c67f
[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_bin =
177 __stringify(CONFIG_CONSUMERD32_BIN);
178 static const char *consumerd64_bin =
179 __stringify(CONFIG_CONSUMERD64_BIN);
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 *bin, *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_bin[0]) {
197 consumerd32_bin = 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_bin[0]) {
204 consumerd64_bin = 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 bin = getenv("LTTNG_CONSUMERD32_BIN");
217 if (bin) {
218 consumerd32_bin = bin;
219 }
220 bin = getenv("LTTNG_CONSUMERD64_BIN");
221 if (bin) {
222 consumerd64_bin = bin;
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 tracepoint(ust_unregister_start);
1224
1225 /* Removing from the poll set */
1226 ret = lttng_poll_del(&events, pollfd);
1227 if (ret < 0) {
1228 goto error;
1229 }
1230
1231 /* Socket closed on remote end. */
1232 ust_app_unregister(pollfd);
1233
1234 tracepoint(ust_unregister_stop);
1235 break;
1236 }
1237 }
1238 }
1239 }
1240
1241 error:
1242 DBG("Application communication apps dying");
1243 close(apps_cmd_pipe[0]);
1244 close(apps_cmd_pipe[1]);
1245
1246 lttng_poll_clean(&events);
1247
1248 rcu_thread_offline();
1249 rcu_unregister_thread();
1250 return NULL;
1251 }
1252
1253 /*
1254 * Dispatch request from the registration threads to the application
1255 * communication thread.
1256 */
1257 static void *thread_dispatch_ust_registration(void *data)
1258 {
1259 int ret;
1260 struct cds_wfq_node *node;
1261 struct ust_command *ust_cmd = NULL;
1262
1263 tracepoint(sessiond_th_dispatch_start);
1264
1265 DBG("[thread] Dispatch UST command started");
1266
1267 while (!dispatch_thread_exit) {
1268 /* Atomically prepare the queue futex */
1269 futex_nto1_prepare(&ust_cmd_queue.futex);
1270
1271 do {
1272 tracepoint(sessiond_th_dispatch_block);
1273
1274 /* Dequeue command for registration */
1275 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1276 if (node == NULL) {
1277 DBG("Woken up but nothing in the UST command queue");
1278 /* Continue thread execution */
1279 break;
1280 }
1281
1282 tracepoint(ust_dispatch_register_start);
1283
1284 ust_cmd = caa_container_of(node, struct ust_command, node);
1285
1286 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1287 " gid:%d sock:%d name:%s (version %d.%d)",
1288 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1289 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1290 ust_cmd->sock, ust_cmd->reg_msg.name,
1291 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1292 /*
1293 * Inform apps thread of the new application registration. This
1294 * call is blocking so we can be assured that the data will be read
1295 * at some point in time or wait to the end of the world :)
1296 */
1297 ret = write(apps_cmd_pipe[1], ust_cmd,
1298 sizeof(struct ust_command));
1299 if (ret < 0) {
1300 perror("write apps cmd pipe");
1301 if (errno == EBADF) {
1302 /*
1303 * We can't inform the application thread to process
1304 * registration. We will exit or else application
1305 * registration will not occur and tracing will never
1306 * start.
1307 */
1308 goto error;
1309 }
1310 }
1311 free(ust_cmd);
1312 } while (node != NULL);
1313
1314 tracepoint(ust_dispatch_register_stop);
1315
1316 /* Futex wait on queue. Blocking call on futex() */
1317 futex_nto1_wait(&ust_cmd_queue.futex);
1318 }
1319
1320 error:
1321 DBG("Dispatch thread dying");
1322 return NULL;
1323 }
1324
1325 /*
1326 * This thread manage application registration.
1327 */
1328 static void *thread_registration_apps(void *data)
1329 {
1330 int sock = 0, i, ret, pollfd;
1331 uint32_t revents, nb_fd;
1332 struct lttng_poll_event events;
1333 /*
1334 * Get allocated in this thread, enqueued to a global queue, dequeued and
1335 * freed in the manage apps thread.
1336 */
1337 struct ust_command *ust_cmd = NULL;
1338
1339 tracepoint(sessiond_th_reg_start);
1340
1341 DBG("[thread] Manage application registration started");
1342
1343 ret = lttcomm_listen_unix_sock(apps_sock);
1344 if (ret < 0) {
1345 goto error;
1346 }
1347
1348 /*
1349 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1350 * more will be added to this poll set.
1351 */
1352 ret = create_thread_poll_set(&events, 2);
1353 if (ret < 0) {
1354 goto error;
1355 }
1356
1357 /* Add the application registration socket */
1358 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1359 if (ret < 0) {
1360 goto error;
1361 }
1362
1363 /* Notify all applications to register */
1364 ret = notify_ust_apps(1);
1365 if (ret < 0) {
1366 ERR("Failed to notify applications or create the wait shared memory.\n"
1367 "Execution continues but there might be problem for already\n"
1368 "running applications that wishes to register.");
1369 }
1370
1371 while (1) {
1372 DBG("Accepting application registration");
1373
1374 tracepoint(sessiond_th_reg_poll);
1375
1376 nb_fd = LTTNG_POLL_GETNB(&events);
1377
1378 /* Inifinite blocking call, waiting for transmission */
1379 ret = lttng_poll_wait(&events, -1);
1380 if (ret < 0) {
1381 goto error;
1382 }
1383
1384 for (i = 0; i < nb_fd; i++) {
1385 /* Fetch once the poll data */
1386 revents = LTTNG_POLL_GETEV(&events, i);
1387 pollfd = LTTNG_POLL_GETFD(&events, i);
1388
1389 /* Thread quit pipe has been closed. Killing thread. */
1390 ret = check_thread_quit_pipe(pollfd, revents);
1391 if (ret) {
1392 goto error;
1393 }
1394
1395 /* Event on the registration socket */
1396 if (pollfd == apps_sock) {
1397 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1398 ERR("Register apps socket poll error");
1399 goto error;
1400 } else if (revents & LPOLLIN) {
1401 /* Registration starts here. Recording cycles */
1402 tracepoint(ust_register_start);
1403
1404 sock = lttcomm_accept_unix_sock(apps_sock);
1405 if (sock < 0) {
1406 goto error;
1407 }
1408
1409 /* Create UST registration command for enqueuing */
1410 ust_cmd = zmalloc(sizeof(struct ust_command));
1411 if (ust_cmd == NULL) {
1412 perror("ust command zmalloc");
1413 goto error;
1414 }
1415
1416 /*
1417 * Using message-based transmissions to ensure we don't
1418 * have to deal with partially received messages.
1419 */
1420 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1421 sizeof(struct ust_register_msg));
1422 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1423 if (ret < 0) {
1424 perror("lttcomm_recv_unix_sock register apps");
1425 } else {
1426 ERR("Wrong size received on apps register");
1427 }
1428 free(ust_cmd);
1429 close(sock);
1430 continue;
1431 }
1432
1433 ust_cmd->sock = sock;
1434
1435 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1436 " gid:%d sock:%d name:%s (version %d.%d)",
1437 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1438 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1439 ust_cmd->sock, ust_cmd->reg_msg.name,
1440 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1441
1442 /*
1443 * Lock free enqueue the registration request. The red pill
1444 * has been taken! This apps will be part of the *system*.
1445 */
1446 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1447
1448 /*
1449 * Wake the registration queue futex. Implicit memory
1450 * barrier with the exchange in cds_wfq_enqueue.
1451 */
1452 futex_nto1_wake(&ust_cmd_queue.futex);
1453
1454 tracepoint(ust_register_stop);
1455 }
1456 }
1457 }
1458 }
1459
1460 error:
1461 DBG("UST Registration thread dying");
1462
1463 /* Notify that the registration thread is gone */
1464 notify_ust_apps(0);
1465
1466 close(apps_sock);
1467 close(sock);
1468 unlink(apps_unix_sock_path);
1469
1470 lttng_poll_clean(&events);
1471
1472 return NULL;
1473 }
1474
1475 /*
1476 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1477 * exec or it will fails.
1478 */
1479 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1480 {
1481 int ret;
1482 struct timespec timeout;
1483
1484 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1485 timeout.tv_nsec = 0;
1486
1487 /* Setup semaphore */
1488 ret = sem_init(&consumer_data->sem, 0, 0);
1489 if (ret < 0) {
1490 PERROR("sem_init consumer semaphore");
1491 goto error;
1492 }
1493
1494 ret = pthread_create(&consumer_data->thread, NULL,
1495 thread_manage_consumer, consumer_data);
1496 if (ret != 0) {
1497 PERROR("pthread_create consumer");
1498 ret = -1;
1499 goto error;
1500 }
1501
1502 /* Get time for sem_timedwait absolute timeout */
1503 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1504 if (ret < 0) {
1505 PERROR("clock_gettime spawn consumer");
1506 /* Infinite wait for the kconsumerd thread to be ready */
1507 ret = sem_wait(&consumer_data->sem);
1508 } else {
1509 /* Normal timeout if the gettime was successful */
1510 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1511 ret = sem_timedwait(&consumer_data->sem, &timeout);
1512 }
1513
1514 if (ret < 0) {
1515 if (errno == ETIMEDOUT) {
1516 /*
1517 * Call has timed out so we kill the kconsumerd_thread and return
1518 * an error.
1519 */
1520 ERR("The consumer thread was never ready. Killing it");
1521 ret = pthread_cancel(consumer_data->thread);
1522 if (ret < 0) {
1523 PERROR("pthread_cancel consumer thread");
1524 }
1525 } else {
1526 PERROR("semaphore wait failed consumer thread");
1527 }
1528 goto error;
1529 }
1530
1531 pthread_mutex_lock(&consumer_data->pid_mutex);
1532 if (consumer_data->pid == 0) {
1533 ERR("Kconsumerd did not start");
1534 pthread_mutex_unlock(&consumer_data->pid_mutex);
1535 goto error;
1536 }
1537 pthread_mutex_unlock(&consumer_data->pid_mutex);
1538
1539 return 0;
1540
1541 error:
1542 return ret;
1543 }
1544
1545 /*
1546 * Join consumer thread
1547 */
1548 static int join_consumer_thread(struct consumer_data *consumer_data)
1549 {
1550 void *status;
1551 int ret;
1552
1553 if (consumer_data->pid != 0) {
1554 ret = kill(consumer_data->pid, SIGTERM);
1555 if (ret) {
1556 ERR("Error killing consumer daemon");
1557 return ret;
1558 }
1559 return pthread_join(consumer_data->thread, &status);
1560 } else {
1561 return 0;
1562 }
1563 }
1564
1565 /*
1566 * Fork and exec a consumer daemon (consumerd).
1567 *
1568 * Return pid if successful else -1.
1569 */
1570 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1571 {
1572 int ret;
1573 pid_t pid;
1574 const char *consumer_to_use;
1575 const char *verbosity;
1576 struct stat st;
1577
1578 DBG("Spawning consumerd");
1579
1580 pid = fork();
1581 if (pid == 0) {
1582 /*
1583 * Exec consumerd.
1584 */
1585 if (opt_verbose > 1 || opt_verbose_consumer) {
1586 verbosity = "--verbose";
1587 } else {
1588 verbosity = "--quiet";
1589 }
1590 switch (consumer_data->type) {
1591 case LTTNG_CONSUMER_KERNEL:
1592 /*
1593 * Find out which consumerd to execute. We will
1594 * first try the 64-bit path, then the
1595 * sessiond's installation directory, and
1596 * fallback on the 32-bit one,
1597 */
1598 if (stat(consumerd64_bin, &st) == 0) {
1599 consumer_to_use = consumerd64_bin;
1600 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1601 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1602 } else if (stat(consumerd32_bin, &st) == 0) {
1603 consumer_to_use = consumerd32_bin;
1604 } else {
1605 break;
1606 }
1607 DBG("Using kernel consumer at: %s", consumer_to_use);
1608 execl(consumer_to_use,
1609 "lttng-consumerd", verbosity, "-k",
1610 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1611 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1612 NULL);
1613 break;
1614 case LTTNG_CONSUMER64_UST:
1615 {
1616 char *tmpnew = NULL;
1617
1618 if (consumerd64_libdir[0] != '\0') {
1619 char *tmp;
1620 size_t tmplen;
1621
1622 tmp = getenv("LD_LIBRARY_PATH");
1623 if (!tmp) {
1624 tmp = "";
1625 }
1626 tmplen = strlen("LD_LIBRARY_PATH=")
1627 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1628 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1629 if (!tmpnew) {
1630 ret = -ENOMEM;
1631 goto error;
1632 }
1633 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1634 strcat(tmpnew, consumerd64_libdir);
1635 if (tmp[0] != '\0') {
1636 strcat(tmpnew, ":");
1637 strcat(tmpnew, tmp);
1638 }
1639 ret = putenv(tmpnew);
1640 if (ret) {
1641 ret = -errno;
1642 goto error;
1643 }
1644 }
1645 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1646 ret = execl(consumerd64_bin, verbosity, "-u",
1647 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1648 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1649 NULL);
1650 if (consumerd64_libdir[0] != '\0') {
1651 free(tmpnew);
1652 }
1653 if (ret) {
1654 goto error;
1655 }
1656 break;
1657 }
1658 case LTTNG_CONSUMER32_UST:
1659 {
1660 char *tmpnew = NULL;
1661
1662 if (consumerd32_libdir[0] != '\0') {
1663 char *tmp;
1664 size_t tmplen;
1665
1666 tmp = getenv("LD_LIBRARY_PATH");
1667 if (!tmp) {
1668 tmp = "";
1669 }
1670 tmplen = strlen("LD_LIBRARY_PATH=")
1671 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1672 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1673 if (!tmpnew) {
1674 ret = -ENOMEM;
1675 goto error;
1676 }
1677 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1678 strcat(tmpnew, consumerd32_libdir);
1679 if (tmp[0] != '\0') {
1680 strcat(tmpnew, ":");
1681 strcat(tmpnew, tmp);
1682 }
1683 ret = putenv(tmpnew);
1684 if (ret) {
1685 ret = -errno;
1686 goto error;
1687 }
1688 }
1689 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1690 ret = execl(consumerd32_bin, verbosity, "-u",
1691 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1692 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1693 NULL);
1694 if (consumerd32_libdir[0] != '\0') {
1695 free(tmpnew);
1696 }
1697 if (ret) {
1698 goto error;
1699 }
1700 break;
1701 }
1702 default:
1703 perror("unknown consumer type");
1704 exit(EXIT_FAILURE);
1705 }
1706 if (errno != 0) {
1707 perror("kernel start consumer exec");
1708 }
1709 exit(EXIT_FAILURE);
1710 } else if (pid > 0) {
1711 ret = pid;
1712 } else {
1713 perror("start consumer fork");
1714 ret = -errno;
1715 }
1716 error:
1717 return ret;
1718 }
1719
1720 /*
1721 * Spawn the consumerd daemon and session daemon thread.
1722 */
1723 static int start_consumerd(struct consumer_data *consumer_data)
1724 {
1725 int ret;
1726
1727 pthread_mutex_lock(&consumer_data->pid_mutex);
1728 if (consumer_data->pid != 0) {
1729 pthread_mutex_unlock(&consumer_data->pid_mutex);
1730 goto end;
1731 }
1732
1733 ret = spawn_consumerd(consumer_data);
1734 if (ret < 0) {
1735 ERR("Spawning consumerd failed");
1736 pthread_mutex_unlock(&consumer_data->pid_mutex);
1737 goto error;
1738 }
1739
1740 /* Setting up the consumer_data pid */
1741 consumer_data->pid = ret;
1742 DBG2("Consumer pid %d", consumer_data->pid);
1743 pthread_mutex_unlock(&consumer_data->pid_mutex);
1744
1745 DBG2("Spawning consumer control thread");
1746 ret = spawn_consumer_thread(consumer_data);
1747 if (ret < 0) {
1748 ERR("Fatal error spawning consumer control thread");
1749 goto error;
1750 }
1751
1752 end:
1753 return 0;
1754
1755 error:
1756 return ret;
1757 }
1758
1759 /*
1760 * modprobe_kernel_modules
1761 */
1762 static int modprobe_kernel_modules(void)
1763 {
1764 int ret = 0, i;
1765 char modprobe[256];
1766
1767 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1768 ret = snprintf(modprobe, sizeof(modprobe),
1769 "/sbin/modprobe %s%s",
1770 kernel_modules_list[i].required ? "" : "-q ",
1771 kernel_modules_list[i].name);
1772 if (ret < 0) {
1773 perror("snprintf modprobe");
1774 goto error;
1775 }
1776 modprobe[sizeof(modprobe) - 1] = '\0';
1777 ret = system(modprobe);
1778 if (ret == -1) {
1779 ERR("Unable to launch modprobe for module %s",
1780 kernel_modules_list[i].name);
1781 } else if (kernel_modules_list[i].required
1782 && WEXITSTATUS(ret) != 0) {
1783 ERR("Unable to load module %s",
1784 kernel_modules_list[i].name);
1785 } else {
1786 DBG("Modprobe successfully %s",
1787 kernel_modules_list[i].name);
1788 }
1789 }
1790
1791 error:
1792 return ret;
1793 }
1794
1795 /*
1796 * mount_debugfs
1797 */
1798 static int mount_debugfs(char *path)
1799 {
1800 int ret;
1801 char *type = "debugfs";
1802
1803 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1804 if (ret < 0) {
1805 PERROR("Cannot create debugfs path");
1806 goto error;
1807 }
1808
1809 ret = mount(type, path, type, 0, NULL);
1810 if (ret < 0) {
1811 PERROR("Cannot mount debugfs");
1812 goto error;
1813 }
1814
1815 DBG("Mounted debugfs successfully at %s", path);
1816
1817 error:
1818 return ret;
1819 }
1820
1821 /*
1822 * Setup necessary data for kernel tracer action.
1823 */
1824 static void init_kernel_tracer(void)
1825 {
1826 int ret;
1827 char *proc_mounts = "/proc/mounts";
1828 char line[256];
1829 char *debugfs_path = NULL, *lttng_path = NULL;
1830 FILE *fp;
1831
1832 /* Detect debugfs */
1833 fp = fopen(proc_mounts, "r");
1834 if (fp == NULL) {
1835 ERR("Unable to probe %s", proc_mounts);
1836 goto error;
1837 }
1838
1839 while (fgets(line, sizeof(line), fp) != NULL) {
1840 if (strstr(line, "debugfs") != NULL) {
1841 /* Remove first string */
1842 strtok(line, " ");
1843 /* Dup string here so we can reuse line later on */
1844 debugfs_path = strdup(strtok(NULL, " "));
1845 DBG("Got debugfs path : %s", debugfs_path);
1846 break;
1847 }
1848 }
1849
1850 fclose(fp);
1851
1852 /* Mount debugfs if needded */
1853 if (debugfs_path == NULL) {
1854 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1855 if (ret < 0) {
1856 perror("asprintf debugfs path");
1857 goto error;
1858 }
1859 ret = mount_debugfs(debugfs_path);
1860 if (ret < 0) {
1861 perror("Cannot mount debugfs");
1862 goto error;
1863 }
1864 }
1865
1866 /* Modprobe lttng kernel modules */
1867 ret = modprobe_kernel_modules();
1868 if (ret < 0) {
1869 goto error;
1870 }
1871
1872 /* Setup lttng kernel path */
1873 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1874 if (ret < 0) {
1875 perror("asprintf lttng path");
1876 goto error;
1877 }
1878
1879 /* Open debugfs lttng */
1880 kernel_tracer_fd = open(lttng_path, O_RDWR);
1881 if (kernel_tracer_fd < 0) {
1882 DBG("Failed to open %s", lttng_path);
1883 goto error;
1884 }
1885
1886 free(lttng_path);
1887 free(debugfs_path);
1888 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1889 return;
1890
1891 error:
1892 if (lttng_path) {
1893 free(lttng_path);
1894 }
1895 if (debugfs_path) {
1896 free(debugfs_path);
1897 }
1898 WARN("No kernel tracer available");
1899 kernel_tracer_fd = 0;
1900 return;
1901 }
1902
1903 /*
1904 * Init tracing by creating trace directory and sending fds kernel consumer.
1905 */
1906 static int init_kernel_tracing(struct ltt_kernel_session *session)
1907 {
1908 int ret = 0;
1909
1910 if (session->consumer_fds_sent == 0) {
1911 /*
1912 * Assign default kernel consumer socket if no consumer assigned to the
1913 * kernel session. At this point, it's NOT suppose to be 0 but this is
1914 * an extra security check.
1915 */
1916 if (session->consumer_fd == 0) {
1917 session->consumer_fd = kconsumer_data.cmd_sock;
1918 }
1919
1920 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1921 if (ret < 0) {
1922 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1923 goto error;
1924 }
1925
1926 session->consumer_fds_sent = 1;
1927 }
1928
1929 error:
1930 return ret;
1931 }
1932
1933 /*
1934 * Create an UST session and add it to the session ust list.
1935 */
1936 static int create_ust_session(struct ltt_session *session,
1937 struct lttng_domain *domain)
1938 {
1939 int ret;
1940 unsigned int uid;
1941 struct ltt_ust_session *lus = NULL;
1942
1943 switch (domain->type) {
1944 case LTTNG_DOMAIN_UST:
1945 break;
1946 default:
1947 ret = LTTCOMM_UNKNOWN_DOMAIN;
1948 goto error;
1949 }
1950
1951 DBG("Creating UST session");
1952
1953 uid = session->uid;
1954 lus = trace_ust_create_session(session->path, uid, domain);
1955 if (lus == NULL) {
1956 ret = LTTCOMM_UST_SESS_FAIL;
1957 goto error;
1958 }
1959
1960 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1961 geteuid(), allowed_group());
1962 if (ret < 0) {
1963 if (ret != -EEXIST) {
1964 ERR("Trace directory creation error");
1965 ret = LTTCOMM_UST_SESS_FAIL;
1966 goto error;
1967 }
1968 }
1969
1970 /* The domain type dictate different actions on session creation */
1971 switch (domain->type) {
1972 case LTTNG_DOMAIN_UST:
1973 /* No ustctl for the global UST domain */
1974 break;
1975 default:
1976 ERR("Unknown UST domain on create session %d", domain->type);
1977 goto error;
1978 }
1979 session->ust_session = lus;
1980
1981 return LTTCOMM_OK;
1982
1983 error:
1984 free(lus);
1985 return ret;
1986 }
1987
1988 /*
1989 * Create a kernel tracer session then create the default channel.
1990 */
1991 static int create_kernel_session(struct ltt_session *session)
1992 {
1993 int ret;
1994
1995 DBG("Creating kernel session");
1996
1997 ret = kernel_create_session(session, kernel_tracer_fd);
1998 if (ret < 0) {
1999 ret = LTTCOMM_KERN_SESS_FAIL;
2000 goto error;
2001 }
2002
2003 /* Set kernel consumer socket fd */
2004 if (kconsumer_data.cmd_sock) {
2005 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
2006 }
2007
2008 ret = mkdir_recursive(session->kernel_session->trace_path,
2009 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
2010 if (ret < 0) {
2011 if (ret != -EEXIST) {
2012 ERR("Trace directory creation error");
2013 goto error;
2014 }
2015 }
2016
2017 error:
2018 return ret;
2019 }
2020
2021 /*
2022 * Using the session list, filled a lttng_session array to send back to the
2023 * client for session listing.
2024 *
2025 * The session list lock MUST be acquired before calling this function. Use
2026 * session_lock_list() and session_unlock_list().
2027 */
2028 static void list_lttng_sessions(struct lttng_session *sessions)
2029 {
2030 int i = 0;
2031 struct ltt_session *session;
2032
2033 DBG("Getting all available session");
2034 /*
2035 * Iterate over session list and append data after the control struct in
2036 * the buffer.
2037 */
2038 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
2039 strncpy(sessions[i].path, session->path, PATH_MAX);
2040 sessions[i].path[PATH_MAX - 1] = '\0';
2041 strncpy(sessions[i].name, session->name, NAME_MAX);
2042 sessions[i].name[NAME_MAX - 1] = '\0';
2043 sessions[i].enabled = session->enabled;
2044 i++;
2045 }
2046 }
2047
2048 /*
2049 * Fill lttng_channel array of all channels.
2050 */
2051 static void list_lttng_channels(int domain, struct ltt_session *session,
2052 struct lttng_channel *channels)
2053 {
2054 int i = 0;
2055 struct ltt_kernel_channel *kchan;
2056
2057 DBG("Listing channels for session %s", session->name);
2058
2059 switch (domain) {
2060 case LTTNG_DOMAIN_KERNEL:
2061 /* Kernel channels */
2062 if (session->kernel_session != NULL) {
2063 cds_list_for_each_entry(kchan,
2064 &session->kernel_session->channel_list.head, list) {
2065 /* Copy lttng_channel struct to array */
2066 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2067 channels[i].enabled = kchan->enabled;
2068 i++;
2069 }
2070 }
2071 break;
2072 case LTTNG_DOMAIN_UST:
2073 {
2074 struct cds_lfht_iter iter;
2075 struct ltt_ust_channel *uchan;
2076
2077 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2078 &iter, uchan, node) {
2079 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2080 channels[i].attr.overwrite = uchan->attr.overwrite;
2081 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2082 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2083 channels[i].attr.switch_timer_interval =
2084 uchan->attr.switch_timer_interval;
2085 channels[i].attr.read_timer_interval =
2086 uchan->attr.read_timer_interval;
2087 channels[i].enabled = uchan->enabled;
2088 switch (uchan->attr.output) {
2089 case LTTNG_UST_MMAP:
2090 default:
2091 channels[i].attr.output = LTTNG_EVENT_MMAP;
2092 break;
2093 }
2094 i++;
2095 }
2096 break;
2097 }
2098 default:
2099 break;
2100 }
2101 }
2102
2103 /*
2104 * Create a list of ust global domain events.
2105 */
2106 static int list_lttng_ust_global_events(char *channel_name,
2107 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2108 {
2109 int i = 0, ret = 0;
2110 unsigned int nb_event = 0;
2111 struct cds_lfht_iter iter;
2112 struct cds_lfht_node *node;
2113 struct ltt_ust_channel *uchan;
2114 struct ltt_ust_event *uevent;
2115 struct lttng_event *tmp;
2116
2117 DBG("Listing UST global events for channel %s", channel_name);
2118
2119 rcu_read_lock();
2120
2121 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2122 strlen(channel_name), &iter);
2123 if (node == NULL) {
2124 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2125 goto error;
2126 }
2127
2128 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2129
2130 nb_event += hashtable_get_count(uchan->events);
2131
2132 if (nb_event == 0) {
2133 ret = nb_event;
2134 goto error;
2135 }
2136
2137 DBG3("Listing UST global %d events", nb_event);
2138
2139 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2140 if (tmp == NULL) {
2141 ret = -LTTCOMM_FATAL;
2142 goto error;
2143 }
2144
2145 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2146 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2147 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2148 tmp[i].enabled = uevent->enabled;
2149 switch (uevent->attr.instrumentation) {
2150 case LTTNG_UST_TRACEPOINT:
2151 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2152 break;
2153 case LTTNG_UST_PROBE:
2154 tmp[i].type = LTTNG_EVENT_PROBE;
2155 break;
2156 case LTTNG_UST_FUNCTION:
2157 tmp[i].type = LTTNG_EVENT_FUNCTION;
2158 break;
2159 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2160 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2161 break;
2162 }
2163 i++;
2164 }
2165
2166 ret = nb_event;
2167 *events = tmp;
2168
2169 error:
2170 rcu_read_unlock();
2171 return ret;
2172 }
2173
2174 /*
2175 * Fill lttng_event array of all kernel events in the channel.
2176 */
2177 static int list_lttng_kernel_events(char *channel_name,
2178 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2179 {
2180 int i = 0, ret;
2181 unsigned int nb_event;
2182 struct ltt_kernel_event *event;
2183 struct ltt_kernel_channel *kchan;
2184
2185 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2186 if (kchan == NULL) {
2187 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2188 goto error;
2189 }
2190
2191 nb_event = kchan->event_count;
2192
2193 DBG("Listing events for channel %s", kchan->channel->name);
2194
2195 if (nb_event == 0) {
2196 ret = nb_event;
2197 goto error;
2198 }
2199
2200 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2201 if (*events == NULL) {
2202 ret = LTTCOMM_FATAL;
2203 goto error;
2204 }
2205
2206 /* Kernel channels */
2207 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2208 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2209 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2210 (*events)[i].enabled = event->enabled;
2211 switch (event->event->instrumentation) {
2212 case LTTNG_KERNEL_TRACEPOINT:
2213 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2214 break;
2215 case LTTNG_KERNEL_KPROBE:
2216 case LTTNG_KERNEL_KRETPROBE:
2217 (*events)[i].type = LTTNG_EVENT_PROBE;
2218 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2219 sizeof(struct lttng_kernel_kprobe));
2220 break;
2221 case LTTNG_KERNEL_FUNCTION:
2222 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2223 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2224 sizeof(struct lttng_kernel_function));
2225 break;
2226 case LTTNG_KERNEL_NOOP:
2227 (*events)[i].type = LTTNG_EVENT_NOOP;
2228 break;
2229 case LTTNG_KERNEL_SYSCALL:
2230 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2231 break;
2232 case LTTNG_KERNEL_ALL:
2233 assert(0);
2234 break;
2235 }
2236 i++;
2237 }
2238
2239 return nb_event;
2240
2241 error:
2242 return ret;
2243 }
2244
2245 /*
2246 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2247 */
2248 static int cmd_disable_channel(struct ltt_session *session,
2249 int domain, char *channel_name)
2250 {
2251 int ret;
2252 struct ltt_ust_session *usess;
2253
2254 usess = session->ust_session;
2255
2256 switch (domain) {
2257 case LTTNG_DOMAIN_KERNEL:
2258 {
2259 ret = channel_kernel_disable(session->kernel_session,
2260 channel_name);
2261 if (ret != LTTCOMM_OK) {
2262 goto error;
2263 }
2264
2265 kernel_wait_quiescent(kernel_tracer_fd);
2266 break;
2267 }
2268 case LTTNG_DOMAIN_UST:
2269 {
2270 struct ltt_ust_channel *uchan;
2271 struct cds_lfht *chan_ht;
2272
2273 chan_ht = usess->domain_global.channels;
2274
2275 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2276 if (uchan == NULL) {
2277 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2278 goto error;
2279 }
2280
2281 ret = channel_ust_disable(usess, domain, uchan);
2282 if (ret != LTTCOMM_OK) {
2283 goto error;
2284 }
2285 break;
2286 }
2287 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2288 case LTTNG_DOMAIN_UST_EXEC_NAME:
2289 case LTTNG_DOMAIN_UST_PID:
2290 ret = LTTCOMM_NOT_IMPLEMENTED;
2291 goto error;
2292 default:
2293 ret = LTTCOMM_UNKNOWN_DOMAIN;
2294 goto error;
2295 }
2296
2297 ret = LTTCOMM_OK;
2298
2299 error:
2300 return ret;
2301 }
2302
2303 /*
2304 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2305 */
2306 static int cmd_enable_channel(struct ltt_session *session,
2307 int domain, struct lttng_channel *attr)
2308 {
2309 int ret;
2310 struct ltt_ust_session *usess = session->ust_session;
2311 struct cds_lfht *chan_ht;
2312
2313 DBG("Enabling channel %s for session %s", attr->name, session->name);
2314
2315 switch (domain) {
2316 case LTTNG_DOMAIN_KERNEL:
2317 {
2318 struct ltt_kernel_channel *kchan;
2319
2320 kchan = trace_kernel_get_channel_by_name(attr->name,
2321 session->kernel_session);
2322 if (kchan == NULL) {
2323 ret = channel_kernel_create(session->kernel_session,
2324 attr, kernel_poll_pipe[1]);
2325 } else {
2326 ret = channel_kernel_enable(session->kernel_session, kchan);
2327 }
2328
2329 if (ret != LTTCOMM_OK) {
2330 goto error;
2331 }
2332
2333 kernel_wait_quiescent(kernel_tracer_fd);
2334 break;
2335 }
2336 case LTTNG_DOMAIN_UST:
2337 {
2338 struct ltt_ust_channel *uchan;
2339
2340 chan_ht = usess->domain_global.channels;
2341
2342 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2343 if (uchan == NULL) {
2344 ret = channel_ust_create(usess, domain, attr);
2345 } else {
2346 ret = channel_ust_enable(usess, domain, uchan);
2347 }
2348 break;
2349 }
2350 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2351 case LTTNG_DOMAIN_UST_EXEC_NAME:
2352 case LTTNG_DOMAIN_UST_PID:
2353 ret = LTTCOMM_NOT_IMPLEMENTED;
2354 goto error;
2355 default:
2356 ret = LTTCOMM_UNKNOWN_DOMAIN;
2357 goto error;
2358 }
2359
2360 error:
2361 return ret;
2362 }
2363
2364 /*
2365 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2366 */
2367 static int cmd_disable_event(struct ltt_session *session, int domain,
2368 char *channel_name, char *event_name)
2369 {
2370 int ret;
2371
2372 switch (domain) {
2373 case LTTNG_DOMAIN_KERNEL:
2374 {
2375 struct ltt_kernel_channel *kchan;
2376 struct ltt_kernel_session *ksess;
2377
2378 ksess = session->kernel_session;
2379
2380 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2381 if (kchan == NULL) {
2382 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2383 goto error;
2384 }
2385
2386 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2387 if (ret != LTTCOMM_OK) {
2388 goto error;
2389 }
2390
2391 kernel_wait_quiescent(kernel_tracer_fd);
2392 break;
2393 }
2394 case LTTNG_DOMAIN_UST:
2395 {
2396 struct ltt_ust_channel *uchan;
2397 struct ltt_ust_session *usess;
2398
2399 usess = session->ust_session;
2400
2401 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2402 channel_name);
2403 if (uchan == NULL) {
2404 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2405 goto error;
2406 }
2407
2408 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2409 if (ret != LTTCOMM_OK) {
2410 goto error;
2411 }
2412
2413 DBG3("Disable UST event %s in channel %s completed", event_name,
2414 channel_name);
2415 break;
2416 }
2417 case LTTNG_DOMAIN_UST_EXEC_NAME:
2418 case LTTNG_DOMAIN_UST_PID:
2419 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2420 default:
2421 ret = LTTCOMM_NOT_IMPLEMENTED;
2422 goto error;
2423 }
2424
2425 ret = LTTCOMM_OK;
2426
2427 error:
2428 return ret;
2429 }
2430
2431 /*
2432 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2433 */
2434 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2435 char *channel_name)
2436 {
2437 int ret;
2438
2439 switch (domain) {
2440 case LTTNG_DOMAIN_KERNEL:
2441 {
2442 struct ltt_kernel_session *ksess;
2443 struct ltt_kernel_channel *kchan;
2444
2445 ksess = session->kernel_session;
2446
2447 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2448 if (kchan == NULL) {
2449 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2450 goto error;
2451 }
2452
2453 ret = event_kernel_disable_all(ksess, kchan);
2454 if (ret != LTTCOMM_OK) {
2455 goto error;
2456 }
2457
2458 kernel_wait_quiescent(kernel_tracer_fd);
2459 break;
2460 }
2461 case LTTNG_DOMAIN_UST:
2462 {
2463 struct ltt_ust_session *usess;
2464 struct ltt_ust_channel *uchan;
2465
2466 usess = session->ust_session;
2467
2468 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2469 channel_name);
2470 if (uchan == NULL) {
2471 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2472 goto error;
2473 }
2474
2475 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2476 if (ret != 0) {
2477 goto error;
2478 }
2479
2480 DBG3("Disable all UST events in channel %s completed", channel_name);
2481
2482 break;
2483 }
2484 case LTTNG_DOMAIN_UST_EXEC_NAME:
2485 case LTTNG_DOMAIN_UST_PID:
2486 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2487 default:
2488 ret = LTTCOMM_NOT_IMPLEMENTED;
2489 goto error;
2490 }
2491
2492 ret = LTTCOMM_OK;
2493
2494 error:
2495 return ret;
2496 }
2497
2498 /*
2499 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2500 */
2501 static int cmd_add_context(struct ltt_session *session, int domain,
2502 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2503 {
2504 int ret;
2505
2506 switch (domain) {
2507 case LTTNG_DOMAIN_KERNEL:
2508 /* Add kernel context to kernel tracer */
2509 ret = context_kernel_add(session->kernel_session, ctx,
2510 event_name, channel_name);
2511 if (ret != LTTCOMM_OK) {
2512 goto error;
2513 }
2514 break;
2515 case LTTNG_DOMAIN_UST:
2516 {
2517 struct ltt_ust_session *usess = session->ust_session;
2518
2519 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2520 if (ret != LTTCOMM_OK) {
2521 goto error;
2522 }
2523 break;
2524 }
2525 case LTTNG_DOMAIN_UST_EXEC_NAME:
2526 case LTTNG_DOMAIN_UST_PID:
2527 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2528 default:
2529 ret = LTTCOMM_NOT_IMPLEMENTED;
2530 goto error;
2531 }
2532
2533 ret = LTTCOMM_OK;
2534
2535 error:
2536 return ret;
2537 }
2538
2539 /*
2540 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2541 *
2542 * TODO: currently, both events and loglevels are kept within the same
2543 * namespace for UST global registry/app registery, so if an event
2544 * happen to have the same name as the loglevel (very unlikely though),
2545 * and an attempt is made to enable/disable both in the same session,
2546 * the first to be created will be the only one allowed to exist.
2547 */
2548 static int cmd_enable_event(struct ltt_session *session, int domain,
2549 char *channel_name, struct lttng_event *event)
2550 {
2551 int ret;
2552 struct lttng_channel *attr;
2553 struct ltt_ust_session *usess = session->ust_session;
2554
2555 switch (domain) {
2556 case LTTNG_DOMAIN_KERNEL:
2557 {
2558 struct ltt_kernel_channel *kchan;
2559
2560 kchan = trace_kernel_get_channel_by_name(channel_name,
2561 session->kernel_session);
2562 if (kchan == NULL) {
2563 attr = channel_new_default_attr(domain);
2564 if (attr == NULL) {
2565 ret = LTTCOMM_FATAL;
2566 goto error;
2567 }
2568 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2569
2570 /* This call will notify the kernel thread */
2571 ret = channel_kernel_create(session->kernel_session,
2572 attr, kernel_poll_pipe[1]);
2573 if (ret != LTTCOMM_OK) {
2574 free(attr);
2575 goto error;
2576 }
2577 free(attr);
2578 }
2579
2580 /* Get the newly created kernel channel pointer */
2581 kchan = trace_kernel_get_channel_by_name(channel_name,
2582 session->kernel_session);
2583 if (kchan == NULL) {
2584 /* This sould not happen... */
2585 ret = LTTCOMM_FATAL;
2586 goto error;
2587 }
2588
2589 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2590 event);
2591 if (ret != LTTCOMM_OK) {
2592 goto error;
2593 }
2594
2595 kernel_wait_quiescent(kernel_tracer_fd);
2596 break;
2597 }
2598 case LTTNG_DOMAIN_UST:
2599 {
2600 struct lttng_channel *attr;
2601 struct ltt_ust_channel *uchan;
2602
2603 /* Get channel from global UST domain */
2604 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2605 channel_name);
2606 if (uchan == NULL) {
2607 /* Create default channel */
2608 attr = channel_new_default_attr(domain);
2609 if (attr == NULL) {
2610 ret = LTTCOMM_FATAL;
2611 goto error;
2612 }
2613 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2614 attr->name[NAME_MAX - 1] = '\0';
2615
2616 ret = channel_ust_create(usess, domain, attr);
2617 if (ret != LTTCOMM_OK) {
2618 free(attr);
2619 goto error;
2620 }
2621 free(attr);
2622
2623 /* Get the newly created channel reference back */
2624 uchan = trace_ust_find_channel_by_name(
2625 usess->domain_global.channels, channel_name);
2626 if (uchan == NULL) {
2627 /* Something is really wrong */
2628 ret = LTTCOMM_FATAL;
2629 goto error;
2630 }
2631 }
2632
2633 /* At this point, the session and channel exist on the tracer */
2634
2635 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2636 if (ret != LTTCOMM_OK) {
2637 goto error;
2638 }
2639 break;
2640 }
2641 case LTTNG_DOMAIN_UST_EXEC_NAME:
2642 case LTTNG_DOMAIN_UST_PID:
2643 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2644 default:
2645 ret = LTTCOMM_NOT_IMPLEMENTED;
2646 goto error;
2647 }
2648
2649 ret = LTTCOMM_OK;
2650
2651 error:
2652 return ret;
2653 }
2654
2655 /*
2656 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2657 */
2658 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2659 char *channel_name, int event_type)
2660 {
2661 int ret;
2662 struct ltt_kernel_channel *kchan;
2663
2664 switch (domain) {
2665 case LTTNG_DOMAIN_KERNEL:
2666 kchan = trace_kernel_get_channel_by_name(channel_name,
2667 session->kernel_session);
2668 if (kchan == NULL) {
2669 /* This call will notify the kernel thread */
2670 ret = channel_kernel_create(session->kernel_session, NULL,
2671 kernel_poll_pipe[1]);
2672 if (ret != LTTCOMM_OK) {
2673 goto error;
2674 }
2675
2676 /* Get the newly created kernel channel pointer */
2677 kchan = trace_kernel_get_channel_by_name(channel_name,
2678 session->kernel_session);
2679 if (kchan == NULL) {
2680 /* This sould not happen... */
2681 ret = LTTCOMM_FATAL;
2682 goto error;
2683 }
2684
2685 }
2686
2687 switch (event_type) {
2688 case LTTNG_EVENT_SYSCALL:
2689 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2690 kchan, kernel_tracer_fd);
2691 break;
2692 case LTTNG_EVENT_TRACEPOINT:
2693 /*
2694 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2695 * events already registered to the channel.
2696 */
2697 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2698 kchan, kernel_tracer_fd);
2699 break;
2700 case LTTNG_EVENT_ALL:
2701 /* Enable syscalls and tracepoints */
2702 ret = event_kernel_enable_all(session->kernel_session,
2703 kchan, kernel_tracer_fd);
2704 break;
2705 default:
2706 ret = LTTCOMM_KERN_ENABLE_FAIL;
2707 goto error;
2708 }
2709
2710 /* Manage return value */
2711 if (ret != LTTCOMM_OK) {
2712 goto error;
2713 }
2714
2715 kernel_wait_quiescent(kernel_tracer_fd);
2716 break;
2717 case LTTNG_DOMAIN_UST:
2718 {
2719 struct lttng_channel *attr;
2720 struct ltt_ust_channel *uchan;
2721 struct ltt_ust_session *usess = session->ust_session;
2722
2723 /* Get channel from global UST domain */
2724 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2725 channel_name);
2726 if (uchan == NULL) {
2727 /* Create default channel */
2728 attr = channel_new_default_attr(domain);
2729 if (attr == NULL) {
2730 ret = LTTCOMM_FATAL;
2731 goto error;
2732 }
2733 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2734 attr->name[NAME_MAX - 1] = '\0';
2735
2736 /* Use the internal command enable channel */
2737 ret = channel_ust_create(usess, domain, attr);
2738 if (ret != LTTCOMM_OK) {
2739 free(attr);
2740 goto error;
2741 }
2742 free(attr);
2743
2744 /* Get the newly created channel reference back */
2745 uchan = trace_ust_find_channel_by_name(
2746 usess->domain_global.channels, channel_name);
2747 if (uchan == NULL) {
2748 /* Something is really wrong */
2749 ret = LTTCOMM_FATAL;
2750 goto error;
2751 }
2752 }
2753
2754 /* At this point, the session and channel exist on the tracer */
2755
2756 switch (event_type) {
2757 case LTTNG_EVENT_ALL:
2758 case LTTNG_EVENT_TRACEPOINT:
2759 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2760 if (ret != LTTCOMM_OK) {
2761 goto error;
2762 }
2763 break;
2764 default:
2765 ret = LTTCOMM_UST_ENABLE_FAIL;
2766 goto error;
2767 }
2768
2769 /* Manage return value */
2770 if (ret != LTTCOMM_OK) {
2771 goto error;
2772 }
2773
2774 break;
2775 }
2776 case LTTNG_DOMAIN_UST_EXEC_NAME:
2777 case LTTNG_DOMAIN_UST_PID:
2778 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2779 default:
2780 ret = LTTCOMM_NOT_IMPLEMENTED;
2781 goto error;
2782 }
2783
2784 ret = LTTCOMM_OK;
2785
2786 error:
2787 return ret;
2788 }
2789
2790 /*
2791 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2792 */
2793 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2794 {
2795 int ret;
2796 ssize_t nb_events = 0;
2797
2798 switch (domain) {
2799 case LTTNG_DOMAIN_KERNEL:
2800 nb_events = kernel_list_events(kernel_tracer_fd, events);
2801 if (nb_events < 0) {
2802 ret = LTTCOMM_KERN_LIST_FAIL;
2803 goto error;
2804 }
2805 break;
2806 case LTTNG_DOMAIN_UST:
2807 nb_events = ust_app_list_events(events);
2808 if (nb_events < 0) {
2809 ret = LTTCOMM_UST_LIST_FAIL;
2810 goto error;
2811 }
2812 break;
2813 default:
2814 ret = LTTCOMM_NOT_IMPLEMENTED;
2815 goto error;
2816 }
2817
2818 return nb_events;
2819
2820 error:
2821 /* Return negative value to differentiate return code */
2822 return -ret;
2823 }
2824
2825 /*
2826 * Command LTTNG_START_TRACE processed by the client thread.
2827 */
2828 static int cmd_start_trace(struct ltt_session *session)
2829 {
2830 int ret;
2831 struct ltt_kernel_session *ksession;
2832 struct ltt_ust_session *usess;
2833
2834 /* Short cut */
2835 ksession = session->kernel_session;
2836 usess = session->ust_session;
2837
2838 if (session->enabled)
2839 return LTTCOMM_UST_START_FAIL;
2840 session->enabled = 1;
2841
2842 /* Kernel tracing */
2843 if (ksession != NULL) {
2844 struct ltt_kernel_channel *kchan;
2845
2846 /* Open kernel metadata */
2847 if (ksession->metadata == NULL) {
2848 ret = kernel_open_metadata(ksession, ksession->trace_path);
2849 if (ret < 0) {
2850 ret = LTTCOMM_KERN_META_FAIL;
2851 goto error;
2852 }
2853 }
2854
2855 /* Open kernel metadata stream */
2856 if (ksession->metadata_stream_fd == 0) {
2857 ret = kernel_open_metadata_stream(ksession);
2858 if (ret < 0) {
2859 ERR("Kernel create metadata stream failed");
2860 ret = LTTCOMM_KERN_STREAM_FAIL;
2861 goto error;
2862 }
2863 }
2864
2865 /* For each channel */
2866 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2867 if (kchan->stream_count == 0) {
2868 ret = kernel_open_channel_stream(kchan);
2869 if (ret < 0) {
2870 ret = LTTCOMM_KERN_STREAM_FAIL;
2871 goto error;
2872 }
2873 /* Update the stream global counter */
2874 ksession->stream_count_global += ret;
2875 }
2876 }
2877
2878 /* Setup kernel consumer socket and send fds to it */
2879 ret = init_kernel_tracing(ksession);
2880 if (ret < 0) {
2881 ret = LTTCOMM_KERN_START_FAIL;
2882 goto error;
2883 }
2884
2885 /* This start the kernel tracing */
2886 ret = kernel_start_session(ksession);
2887 if (ret < 0) {
2888 ret = LTTCOMM_KERN_START_FAIL;
2889 goto error;
2890 }
2891
2892 /* Quiescent wait after starting trace */
2893 kernel_wait_quiescent(kernel_tracer_fd);
2894 }
2895
2896 /* Flag session that trace should start automatically */
2897 if (usess) {
2898 usess->start_trace = 1;
2899
2900 ret = ust_app_start_trace_all(usess);
2901 if (ret < 0) {
2902 ret = LTTCOMM_UST_START_FAIL;
2903 goto error;
2904 }
2905 }
2906
2907 ret = LTTCOMM_OK;
2908
2909 error:
2910 return ret;
2911 }
2912
2913 /*
2914 * Command LTTNG_STOP_TRACE processed by the client thread.
2915 */
2916 static int cmd_stop_trace(struct ltt_session *session)
2917 {
2918 int ret;
2919 struct ltt_kernel_channel *kchan;
2920 struct ltt_kernel_session *ksession;
2921 struct ltt_ust_session *usess;
2922
2923 /* Short cut */
2924 ksession = session->kernel_session;
2925 usess = session->ust_session;
2926
2927 if (!session->enabled)
2928 return LTTCOMM_UST_START_FAIL;
2929 session->enabled = 0;
2930
2931 /* Kernel tracer */
2932 if (ksession != NULL) {
2933 DBG("Stop kernel tracing");
2934
2935 /* Flush all buffers before stopping */
2936 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2937 if (ret < 0) {
2938 ERR("Kernel metadata flush failed");
2939 }
2940
2941 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2942 ret = kernel_flush_buffer(kchan);
2943 if (ret < 0) {
2944 ERR("Kernel flush buffer error");
2945 }
2946 }
2947
2948 ret = kernel_stop_session(ksession);
2949 if (ret < 0) {
2950 ret = LTTCOMM_KERN_STOP_FAIL;
2951 goto error;
2952 }
2953
2954 kernel_wait_quiescent(kernel_tracer_fd);
2955 }
2956
2957 if (usess) {
2958 usess->start_trace = 0;
2959
2960 ret = ust_app_stop_trace_all(usess);
2961 if (ret < 0) {
2962 ret = LTTCOMM_UST_START_FAIL;
2963 goto error;
2964 }
2965 }
2966
2967 ret = LTTCOMM_OK;
2968
2969 error:
2970 return ret;
2971 }
2972
2973 /*
2974 * Command LTTNG_CREATE_SESSION processed by the client thread.
2975 */
2976 static int cmd_create_session(char *name, char *path)
2977 {
2978 int ret;
2979
2980 ret = session_create(name, path);
2981 if (ret != LTTCOMM_OK) {
2982 goto error;
2983 }
2984
2985 ret = LTTCOMM_OK;
2986
2987 error:
2988 return ret;
2989 }
2990
2991 /*
2992 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2993 */
2994 static int cmd_destroy_session(struct ltt_session *session, char *name)
2995 {
2996 int ret;
2997
2998 /* Clean kernel session teardown */
2999 teardown_kernel_session(session);
3000 /* UST session teardown */
3001 teardown_ust_session(session);
3002
3003 /*
3004 * Must notify the kernel thread here to update it's poll setin order
3005 * to remove the channel(s)' fd just destroyed.
3006 */
3007 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3008 if (ret < 0) {
3009 perror("write kernel poll pipe");
3010 }
3011
3012 ret = session_destroy(session);
3013
3014 return ret;
3015 }
3016
3017 /*
3018 * Command LTTNG_CALIBRATE processed by the client thread.
3019 */
3020 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3021 {
3022 int ret;
3023
3024 switch (domain) {
3025 case LTTNG_DOMAIN_KERNEL:
3026 {
3027 struct lttng_kernel_calibrate kcalibrate;
3028
3029 kcalibrate.type = calibrate->type;
3030 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3031 if (ret < 0) {
3032 ret = LTTCOMM_KERN_ENABLE_FAIL;
3033 goto error;
3034 }
3035 break;
3036 }
3037 default:
3038 /* TODO: Userspace tracing */
3039 ret = LTTCOMM_NOT_IMPLEMENTED;
3040 goto error;
3041 }
3042
3043 ret = LTTCOMM_OK;
3044
3045 error:
3046 return ret;
3047 }
3048
3049 /*
3050 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3051 */
3052 static int cmd_register_consumer(struct ltt_session *session, int domain,
3053 char *sock_path)
3054 {
3055 int ret, sock;
3056
3057 switch (domain) {
3058 case LTTNG_DOMAIN_KERNEL:
3059 /* Can't register a consumer if there is already one */
3060 if (session->kernel_session->consumer_fd != 0) {
3061 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3062 goto error;
3063 }
3064
3065 sock = lttcomm_connect_unix_sock(sock_path);
3066 if (sock < 0) {
3067 ret = LTTCOMM_CONNECT_FAIL;
3068 goto error;
3069 }
3070
3071 session->kernel_session->consumer_fd = sock;
3072 break;
3073 default:
3074 /* TODO: Userspace tracing */
3075 ret = LTTCOMM_NOT_IMPLEMENTED;
3076 goto error;
3077 }
3078
3079 ret = LTTCOMM_OK;
3080
3081 error:
3082 return ret;
3083 }
3084
3085 /*
3086 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3087 */
3088 static ssize_t cmd_list_domains(struct ltt_session *session,
3089 struct lttng_domain **domains)
3090 {
3091 int ret, index = 0;
3092 ssize_t nb_dom = 0;
3093
3094 if (session->kernel_session != NULL) {
3095 DBG3("Listing domains found kernel domain");
3096 nb_dom++;
3097 }
3098
3099 if (session->ust_session != NULL) {
3100 DBG3("Listing domains found UST global domain");
3101 nb_dom++;
3102 }
3103
3104 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3105 if (*domains == NULL) {
3106 ret = -LTTCOMM_FATAL;
3107 goto error;
3108 }
3109
3110 if (session->kernel_session != NULL) {
3111 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3112 index++;
3113 }
3114
3115 if (session->ust_session != NULL) {
3116 (*domains)[index].type = LTTNG_DOMAIN_UST;
3117 index++;
3118 }
3119
3120 return nb_dom;
3121
3122 error:
3123 return ret;
3124 }
3125
3126 /*
3127 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3128 */
3129 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3130 struct lttng_channel **channels)
3131 {
3132 int ret;
3133 ssize_t nb_chan = 0;
3134
3135 switch (domain) {
3136 case LTTNG_DOMAIN_KERNEL:
3137 if (session->kernel_session != NULL) {
3138 nb_chan = session->kernel_session->channel_count;
3139 }
3140 DBG3("Number of kernel channels %zd", nb_chan);
3141 break;
3142 case LTTNG_DOMAIN_UST:
3143 if (session->ust_session != NULL) {
3144 nb_chan = hashtable_get_count(
3145 session->ust_session->domain_global.channels);
3146 }
3147 DBG3("Number of UST global channels %zd", nb_chan);
3148 break;
3149 default:
3150 *channels = NULL;
3151 ret = -LTTCOMM_NOT_IMPLEMENTED;
3152 goto error;
3153 }
3154
3155 if (nb_chan > 0) {
3156 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3157 if (*channels == NULL) {
3158 ret = -LTTCOMM_FATAL;
3159 goto error;
3160 }
3161
3162 list_lttng_channels(domain, session, *channels);
3163 } else {
3164 *channels = NULL;
3165 }
3166
3167 return nb_chan;
3168
3169 error:
3170 return ret;
3171 }
3172
3173 /*
3174 * Command LTTNG_LIST_EVENTS processed by the client thread.
3175 */
3176 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3177 char *channel_name, struct lttng_event **events)
3178 {
3179 int ret = 0;
3180 ssize_t nb_event = 0;
3181
3182 switch (domain) {
3183 case LTTNG_DOMAIN_KERNEL:
3184 if (session->kernel_session != NULL) {
3185 nb_event = list_lttng_kernel_events(channel_name,
3186 session->kernel_session, events);
3187 }
3188 break;
3189 case LTTNG_DOMAIN_UST:
3190 {
3191 if (session->ust_session != NULL) {
3192 nb_event = list_lttng_ust_global_events(channel_name,
3193 &session->ust_session->domain_global, events);
3194 }
3195 break;
3196 }
3197 default:
3198 ret = -LTTCOMM_NOT_IMPLEMENTED;
3199 goto error;
3200 }
3201
3202 ret = nb_event;
3203
3204 error:
3205 return ret;
3206 }
3207
3208 /*
3209 * Process the command requested by the lttng client within the command
3210 * context structure. This function make sure that the return structure (llm)
3211 * is set and ready for transmission before returning.
3212 *
3213 * Return any error encountered or 0 for success.
3214 */
3215 static int process_client_msg(struct command_ctx *cmd_ctx)
3216 {
3217 int ret = LTTCOMM_OK;
3218 int need_tracing_session = 1;
3219
3220 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3221
3222 /*
3223 * Check for command that don't needs to allocate a returned payload. We do
3224 * this here so we don't have to make the call for no payload at each
3225 * command.
3226 */
3227 switch(cmd_ctx->lsm->cmd_type) {
3228 case LTTNG_LIST_SESSIONS:
3229 case LTTNG_LIST_TRACEPOINTS:
3230 case LTTNG_LIST_DOMAINS:
3231 case LTTNG_LIST_CHANNELS:
3232 case LTTNG_LIST_EVENTS:
3233 break;
3234 default:
3235 /* Setup lttng message with no payload */
3236 ret = setup_lttng_msg(cmd_ctx, 0);
3237 if (ret < 0) {
3238 /* This label does not try to unlock the session */
3239 goto init_setup_error;
3240 }
3241 }
3242
3243 /* Commands that DO NOT need a session. */
3244 switch (cmd_ctx->lsm->cmd_type) {
3245 case LTTNG_CALIBRATE:
3246 case LTTNG_CREATE_SESSION:
3247 case LTTNG_LIST_SESSIONS:
3248 case LTTNG_LIST_TRACEPOINTS:
3249 need_tracing_session = 0;
3250 break;
3251 default:
3252 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3253 session_lock_list();
3254 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3255 session_unlock_list();
3256 if (cmd_ctx->session == NULL) {
3257 if (cmd_ctx->lsm->session.name != NULL) {
3258 ret = LTTCOMM_SESS_NOT_FOUND;
3259 } else {
3260 /* If no session name specified */
3261 ret = LTTCOMM_SELECT_SESS;
3262 }
3263 goto error;
3264 } else {
3265 /* Acquire lock for the session */
3266 session_lock(cmd_ctx->session);
3267 }
3268 break;
3269 }
3270
3271 /*
3272 * Check domain type for specific "pre-action".
3273 */
3274 switch (cmd_ctx->lsm->domain.type) {
3275 case LTTNG_DOMAIN_KERNEL:
3276 /* Kernel tracer check */
3277 if (kernel_tracer_fd == 0) {
3278 /* Basically, load kernel tracer modules */
3279 init_kernel_tracer();
3280 if (kernel_tracer_fd == 0) {
3281 ret = LTTCOMM_KERN_NA;
3282 goto error;
3283 }
3284 }
3285
3286 /* Need a session for kernel command */
3287 if (need_tracing_session) {
3288 if (cmd_ctx->session->kernel_session == NULL) {
3289 ret = create_kernel_session(cmd_ctx->session);
3290 if (ret < 0) {
3291 ret = LTTCOMM_KERN_SESS_FAIL;
3292 goto error;
3293 }
3294 }
3295
3296 /* Start the kernel consumer daemon */
3297 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3298 if (kconsumer_data.pid == 0 &&
3299 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3300 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3301 ret = start_consumerd(&kconsumer_data);
3302 if (ret < 0) {
3303 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3304 goto error;
3305 }
3306 } else {
3307 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3308 }
3309 }
3310 break;
3311 case LTTNG_DOMAIN_UST:
3312 {
3313 if (need_tracing_session) {
3314 if (cmd_ctx->session->ust_session == NULL) {
3315 ret = create_ust_session(cmd_ctx->session,
3316 &cmd_ctx->lsm->domain);
3317 if (ret != LTTCOMM_OK) {
3318 goto error;
3319 }
3320 }
3321 /* Start the UST consumer daemons */
3322 /* 64-bit */
3323 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3324 if (consumerd64_bin[0] != '\0' &&
3325 ustconsumer64_data.pid == 0 &&
3326 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3327 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3328 ret = start_consumerd(&ustconsumer64_data);
3329 if (ret < 0) {
3330 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3331 ust_consumerd64_fd = -EINVAL;
3332 goto error;
3333 }
3334
3335 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3336 } else {
3337 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3338 }
3339 /* 32-bit */
3340 if (consumerd32_bin[0] != '\0' &&
3341 ustconsumer32_data.pid == 0 &&
3342 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3343 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3344 ret = start_consumerd(&ustconsumer32_data);
3345 if (ret < 0) {
3346 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3347 ust_consumerd32_fd = -EINVAL;
3348 goto error;
3349 }
3350 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3351 } else {
3352 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3353 }
3354 }
3355 break;
3356 }
3357 default:
3358 break;
3359 }
3360
3361 /* Process by command type */
3362 switch (cmd_ctx->lsm->cmd_type) {
3363 case LTTNG_ADD_CONTEXT:
3364 {
3365 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3366 cmd_ctx->lsm->u.context.channel_name,
3367 cmd_ctx->lsm->u.context.event_name,
3368 &cmd_ctx->lsm->u.context.ctx);
3369 break;
3370 }
3371 case LTTNG_DISABLE_CHANNEL:
3372 {
3373 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3374 cmd_ctx->lsm->u.disable.channel_name);
3375 break;
3376 }
3377 case LTTNG_DISABLE_EVENT:
3378 {
3379 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3380 cmd_ctx->lsm->u.disable.channel_name,
3381 cmd_ctx->lsm->u.disable.name);
3382 ret = LTTCOMM_OK;
3383 break;
3384 }
3385 case LTTNG_DISABLE_ALL_EVENT:
3386 {
3387 DBG("Disabling all events");
3388
3389 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3390 cmd_ctx->lsm->u.disable.channel_name);
3391 break;
3392 }
3393 case LTTNG_ENABLE_CHANNEL:
3394 {
3395 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3396 &cmd_ctx->lsm->u.channel.chan);
3397 break;
3398 }
3399 case LTTNG_ENABLE_EVENT:
3400 {
3401 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3402 cmd_ctx->lsm->u.enable.channel_name,
3403 &cmd_ctx->lsm->u.enable.event);
3404 break;
3405 }
3406 case LTTNG_ENABLE_ALL_EVENT:
3407 {
3408 DBG("Enabling all events");
3409
3410 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3411 cmd_ctx->lsm->u.enable.channel_name,
3412 cmd_ctx->lsm->u.enable.event.type);
3413 break;
3414 }
3415 case LTTNG_LIST_TRACEPOINTS:
3416 {
3417 struct lttng_event *events;
3418 ssize_t nb_events;
3419
3420 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3421 if (nb_events < 0) {
3422 ret = -nb_events;
3423 goto error;
3424 }
3425
3426 /*
3427 * Setup lttng message with payload size set to the event list size in
3428 * bytes and then copy list into the llm payload.
3429 */
3430 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3431 if (ret < 0) {
3432 free(events);
3433 goto setup_error;
3434 }
3435
3436 /* Copy event list into message payload */
3437 memcpy(cmd_ctx->llm->payload, events,
3438 sizeof(struct lttng_event) * nb_events);
3439
3440 free(events);
3441
3442 ret = LTTCOMM_OK;
3443 break;
3444 }
3445 case LTTNG_START_TRACE:
3446 {
3447 ret = cmd_start_trace(cmd_ctx->session);
3448 break;
3449 }
3450 case LTTNG_STOP_TRACE:
3451 {
3452 ret = cmd_stop_trace(cmd_ctx->session);
3453 break;
3454 }
3455 case LTTNG_CREATE_SESSION:
3456 {
3457 tracepoint(create_session_start);
3458 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3459 cmd_ctx->lsm->session.path);
3460 tracepoint(create_session_end);
3461 break;
3462 }
3463 case LTTNG_DESTROY_SESSION:
3464 {
3465 tracepoint(destroy_session_start);
3466 ret = cmd_destroy_session(cmd_ctx->session,
3467 cmd_ctx->lsm->session.name);
3468 tracepoint(destroy_session_end);
3469 break;
3470 }
3471 case LTTNG_LIST_DOMAINS:
3472 {
3473 ssize_t nb_dom;
3474 struct lttng_domain *domains;
3475
3476 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3477 if (nb_dom < 0) {
3478 ret = -nb_dom;
3479 goto error;
3480 }
3481
3482 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3483 if (ret < 0) {
3484 goto setup_error;
3485 }
3486
3487 /* Copy event list into message payload */
3488 memcpy(cmd_ctx->llm->payload, domains,
3489 nb_dom * sizeof(struct lttng_domain));
3490
3491 free(domains);
3492
3493 ret = LTTCOMM_OK;
3494 break;
3495 }
3496 case LTTNG_LIST_CHANNELS:
3497 {
3498 size_t nb_chan;
3499 struct lttng_channel *channels;
3500
3501 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3502 cmd_ctx->session, &channels);
3503 if (nb_chan < 0) {
3504 ret = -nb_chan;
3505 goto error;
3506 }
3507
3508 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3509 if (ret < 0) {
3510 goto setup_error;
3511 }
3512
3513 /* Copy event list into message payload */
3514 memcpy(cmd_ctx->llm->payload, channels,
3515 nb_chan * sizeof(struct lttng_channel));
3516
3517 free(channels);
3518
3519 ret = LTTCOMM_OK;
3520 break;
3521 }
3522 case LTTNG_LIST_EVENTS:
3523 {
3524 ssize_t nb_event;
3525 struct lttng_event *events = NULL;
3526
3527 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3528 cmd_ctx->lsm->u.list.channel_name, &events);
3529 if (nb_event < 0) {
3530 ret = -nb_event;
3531 goto error;
3532 }
3533
3534 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3535 if (ret < 0) {
3536 goto setup_error;
3537 }
3538
3539 /* Copy event list into message payload */
3540 memcpy(cmd_ctx->llm->payload, events,
3541 nb_event * sizeof(struct lttng_event));
3542
3543 free(events);
3544
3545 ret = LTTCOMM_OK;
3546 break;
3547 }
3548 case LTTNG_LIST_SESSIONS:
3549 {
3550 session_lock_list();
3551
3552 if (session_list_ptr->count == 0) {
3553 ret = LTTCOMM_NO_SESSION;
3554 session_unlock_list();
3555 goto error;
3556 }
3557
3558 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3559 session_list_ptr->count);
3560 if (ret < 0) {
3561 session_unlock_list();
3562 goto setup_error;
3563 }
3564
3565 /* Filled the session array */
3566 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3567
3568 session_unlock_list();
3569
3570 ret = LTTCOMM_OK;
3571 break;
3572 }
3573 case LTTNG_CALIBRATE:
3574 {
3575 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3576 &cmd_ctx->lsm->u.calibrate);
3577 break;
3578 }
3579 case LTTNG_REGISTER_CONSUMER:
3580 {
3581 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3582 cmd_ctx->lsm->u.reg.path);
3583 break;
3584 }
3585 default:
3586 ret = LTTCOMM_UND;
3587 break;
3588 }
3589
3590 error:
3591 if (cmd_ctx->llm == NULL) {
3592 DBG("Missing llm structure. Allocating one.");
3593 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3594 goto setup_error;
3595 }
3596 }
3597 /* Set return code */
3598 cmd_ctx->llm->ret_code = ret;
3599 setup_error:
3600 if (cmd_ctx->session) {
3601 session_unlock(cmd_ctx->session);
3602 }
3603 init_setup_error:
3604 return ret;
3605 }
3606
3607 /*
3608 * This thread manage all clients request using the unix client socket for
3609 * communication.
3610 */
3611 static void *thread_manage_clients(void *data)
3612 {
3613 int sock = 0, ret, i, pollfd;
3614 uint32_t revents, nb_fd;
3615 struct command_ctx *cmd_ctx = NULL;
3616 struct lttng_poll_event events;
3617
3618 tracepoint(sessiond_th_cli_start);
3619
3620 DBG("[thread] Manage client started");
3621
3622 rcu_register_thread();
3623
3624 ret = lttcomm_listen_unix_sock(client_sock);
3625 if (ret < 0) {
3626 goto error;
3627 }
3628
3629 /*
3630 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3631 * more will be added to this poll set.
3632 */
3633 ret = create_thread_poll_set(&events, 2);
3634 if (ret < 0) {
3635 goto error;
3636 }
3637
3638 /* Add the application registration socket */
3639 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3640 if (ret < 0) {
3641 goto error;
3642 }
3643
3644 /*
3645 * Notify parent pid that we are ready to accept command for client side.
3646 */
3647 if (opt_sig_parent) {
3648 kill(ppid, SIGCHLD);
3649 }
3650
3651 while (1) {
3652 DBG("Accepting client command ...");
3653
3654 tracepoint(sessiond_th_cli_poll);
3655
3656 nb_fd = LTTNG_POLL_GETNB(&events);
3657
3658 /* Inifinite blocking call, waiting for transmission */
3659 ret = lttng_poll_wait(&events, -1);
3660 if (ret < 0) {
3661 goto error;
3662 }
3663
3664 for (i = 0; i < nb_fd; i++) {
3665 /* Fetch once the poll data */
3666 revents = LTTNG_POLL_GETEV(&events, i);
3667 pollfd = LTTNG_POLL_GETFD(&events, i);
3668
3669 /* Thread quit pipe has been closed. Killing thread. */
3670 ret = check_thread_quit_pipe(pollfd, revents);
3671 if (ret) {
3672 goto error;
3673 }
3674
3675 /* Event on the registration socket */
3676 if (pollfd == client_sock) {
3677 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3678 ERR("Client socket poll error");
3679 goto error;
3680 }
3681 }
3682 }
3683
3684 DBG("Wait for client response");
3685
3686 sock = lttcomm_accept_unix_sock(client_sock);
3687 if (sock < 0) {
3688 goto error;
3689 }
3690
3691 /* Allocate context command to process the client request */
3692 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3693 if (cmd_ctx == NULL) {
3694 perror("zmalloc cmd_ctx");
3695 goto error;
3696 }
3697
3698 /* Allocate data buffer for reception */
3699 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3700 if (cmd_ctx->lsm == NULL) {
3701 perror("zmalloc cmd_ctx->lsm");
3702 goto error;
3703 }
3704
3705 cmd_ctx->llm = NULL;
3706 cmd_ctx->session = NULL;
3707
3708 /*
3709 * Data is received from the lttng client. The struct
3710 * lttcomm_session_msg (lsm) contains the command and data request of
3711 * the client.
3712 */
3713 DBG("Receiving data from client ...");
3714 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3715 sizeof(struct lttcomm_session_msg));
3716 if (ret <= 0) {
3717 DBG("Nothing recv() from client... continuing");
3718 close(sock);
3719 free(cmd_ctx);
3720 continue;
3721 }
3722
3723 // TODO: Validate cmd_ctx including sanity check for
3724 // security purpose.
3725
3726 rcu_thread_online();
3727 /*
3728 * This function dispatch the work to the kernel or userspace tracer
3729 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3730 * informations for the client. The command context struct contains
3731 * everything this function may needs.
3732 */
3733 ret = process_client_msg(cmd_ctx);
3734 rcu_thread_offline();
3735 if (ret < 0) {
3736 /*
3737 * TODO: Inform client somehow of the fatal error. At
3738 * this point, ret < 0 means that a zmalloc failed
3739 * (ENOMEM). Error detected but still accept command.
3740 */
3741 clean_command_ctx(&cmd_ctx);
3742 continue;
3743 }
3744
3745 DBG("Sending response (size: %d, retcode: %s)",
3746 cmd_ctx->lttng_msg_size,
3747 lttng_strerror(-cmd_ctx->llm->ret_code));
3748 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3749 if (ret < 0) {
3750 ERR("Failed to send data back to client");
3751 }
3752
3753 clean_command_ctx(&cmd_ctx);
3754
3755 /* End of transmission */
3756 close(sock);
3757 }
3758
3759 error:
3760 DBG("Client thread dying");
3761 unlink(client_unix_sock_path);
3762 close(client_sock);
3763 close(sock);
3764
3765 lttng_poll_clean(&events);
3766 clean_command_ctx(&cmd_ctx);
3767
3768 rcu_unregister_thread();
3769 return NULL;
3770 }
3771
3772
3773 /*
3774 * usage function on stderr
3775 */
3776 static void usage(void)
3777 {
3778 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3779 fprintf(stderr, " -h, --help Display this usage.\n");
3780 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3781 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3782 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3783 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3784 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3785 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3786 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3787 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3788 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3789 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3790 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3791 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3792 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3793 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3794 fprintf(stderr, " -V, --version Show version number.\n");
3795 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3796 fprintf(stderr, " -q, --quiet No output at all.\n");
3797 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3798 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3799 }
3800
3801 /*
3802 * daemon argument parsing
3803 */
3804 static int parse_args(int argc, char **argv)
3805 {
3806 int c;
3807
3808 static struct option long_options[] = {
3809 { "client-sock", 1, 0, 'c' },
3810 { "apps-sock", 1, 0, 'a' },
3811 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3812 { "kconsumerd-err-sock", 1, 0, 'E' },
3813 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3814 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3815 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3816 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3817 { "consumerd32-path", 1, 0, 'u' },
3818 { "consumerd32-libdir", 1, 0, 'U' },
3819 { "consumerd64-path", 1, 0, 't' },
3820 { "consumerd64-libdir", 1, 0, 'T' },
3821 { "daemonize", 0, 0, 'd' },
3822 { "sig-parent", 0, 0, 'S' },
3823 { "help", 0, 0, 'h' },
3824 { "group", 1, 0, 'g' },
3825 { "version", 0, 0, 'V' },
3826 { "quiet", 0, 0, 'q' },
3827 { "verbose", 0, 0, 'v' },
3828 { "verbose-consumer", 0, 0, 'Z' },
3829 { NULL, 0, 0, 0 }
3830 };
3831
3832 while (1) {
3833 int option_index = 0;
3834 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3835 long_options, &option_index);
3836 if (c == -1) {
3837 break;
3838 }
3839
3840 switch (c) {
3841 case 0:
3842 fprintf(stderr, "option %s", long_options[option_index].name);
3843 if (optarg) {
3844 fprintf(stderr, " with arg %s\n", optarg);
3845 }
3846 break;
3847 case 'c':
3848 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3849 break;
3850 case 'a':
3851 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3852 break;
3853 case 'd':
3854 opt_daemon = 1;
3855 break;
3856 case 'g':
3857 opt_tracing_group = optarg;
3858 break;
3859 case 'h':
3860 usage();
3861 exit(EXIT_FAILURE);
3862 case 'V':
3863 fprintf(stdout, "%s\n", VERSION);
3864 exit(EXIT_SUCCESS);
3865 case 'S':
3866 opt_sig_parent = 1;
3867 break;
3868 case 'E':
3869 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3870 break;
3871 case 'C':
3872 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3873 break;
3874 case 'F':
3875 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3876 break;
3877 case 'D':
3878 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3879 break;
3880 case 'H':
3881 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3882 break;
3883 case 'G':
3884 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3885 break;
3886 case 'q':
3887 opt_quiet = 1;
3888 break;
3889 case 'v':
3890 /* Verbose level can increase using multiple -v */
3891 opt_verbose += 1;
3892 break;
3893 case 'Z':
3894 opt_verbose_consumer += 1;
3895 break;
3896 case 'u':
3897 consumerd32_bin= optarg;
3898 break;
3899 case 'U':
3900 consumerd32_libdir = optarg;
3901 break;
3902 case 't':
3903 consumerd64_bin = optarg;
3904 break;
3905 case 'T':
3906 consumerd64_libdir = optarg;
3907 break;
3908 default:
3909 /* Unknown option or other error.
3910 * Error is printed by getopt, just return */
3911 return -1;
3912 }
3913 }
3914
3915 return 0;
3916 }
3917
3918 /*
3919 * Creates the two needed socket by the daemon.
3920 * apps_sock - The communication socket for all UST apps.
3921 * client_sock - The communication of the cli tool (lttng).
3922 */
3923 static int init_daemon_socket(void)
3924 {
3925 int ret = 0;
3926 mode_t old_umask;
3927
3928 old_umask = umask(0);
3929
3930 /* Create client tool unix socket */
3931 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3932 if (client_sock < 0) {
3933 ERR("Create unix sock failed: %s", client_unix_sock_path);
3934 ret = -1;
3935 goto end;
3936 }
3937
3938 /* File permission MUST be 660 */
3939 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3940 if (ret < 0) {
3941 ERR("Set file permissions failed: %s", client_unix_sock_path);
3942 perror("chmod");
3943 goto end;
3944 }
3945
3946 /* Create the application unix socket */
3947 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3948 if (apps_sock < 0) {
3949 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3950 ret = -1;
3951 goto end;
3952 }
3953
3954 /* File permission MUST be 666 */
3955 ret = chmod(apps_unix_sock_path,
3956 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3957 if (ret < 0) {
3958 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3959 perror("chmod");
3960 goto end;
3961 }
3962
3963 end:
3964 umask(old_umask);
3965 return ret;
3966 }
3967
3968 /*
3969 * Check if the global socket is available, and if a daemon is answering at the
3970 * other side. If yes, error is returned.
3971 */
3972 static int check_existing_daemon(void)
3973 {
3974 if (access(client_unix_sock_path, F_OK) < 0 &&
3975 access(apps_unix_sock_path, F_OK) < 0) {
3976 return 0;
3977 }
3978
3979 /* Is there anybody out there ? */
3980 if (lttng_session_daemon_alive()) {
3981 return -EEXIST;
3982 } else {
3983 return 0;
3984 }
3985 }
3986
3987 /*
3988 * Set the tracing group gid onto the client socket.
3989 *
3990 * Race window between mkdir and chown is OK because we are going from more
3991 * permissive (root.root) to les permissive (root.tracing).
3992 */
3993 static int set_permissions(void)
3994 {
3995 int ret;
3996 gid_t gid;
3997
3998 gid = allowed_group();
3999 if (gid < 0) {
4000 if (is_root) {
4001 WARN("No tracing group detected");
4002 ret = 0;
4003 } else {
4004 ERR("Missing tracing group. Aborting execution.");
4005 ret = -1;
4006 }
4007 goto end;
4008 }
4009
4010 /* Set lttng run dir */
4011 ret = chown(LTTNG_RUNDIR, 0, gid);
4012 if (ret < 0) {
4013 ERR("Unable to set group on " LTTNG_RUNDIR);
4014 perror("chown");
4015 }
4016
4017 /* lttng client socket path */
4018 ret = chown(client_unix_sock_path, 0, gid);
4019 if (ret < 0) {
4020 ERR("Unable to set group on %s", client_unix_sock_path);
4021 perror("chown");
4022 }
4023
4024 /* kconsumer error socket path */
4025 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4026 if (ret < 0) {
4027 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4028 perror("chown");
4029 }
4030
4031 /* 64-bit ustconsumer error socket path */
4032 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4033 if (ret < 0) {
4034 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4035 perror("chown");
4036 }
4037
4038 /* 32-bit ustconsumer compat32 error socket path */
4039 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4040 if (ret < 0) {
4041 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4042 perror("chown");
4043 }
4044
4045 DBG("All permissions are set");
4046
4047 end:
4048 return ret;
4049 }
4050
4051 /*
4052 * Create the pipe used to wake up the kernel thread.
4053 */
4054 static int create_kernel_poll_pipe(void)
4055 {
4056 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4057 }
4058
4059 /*
4060 * Create the application command pipe to wake thread_manage_apps.
4061 */
4062 static int create_apps_cmd_pipe(void)
4063 {
4064 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4065 }
4066
4067 /*
4068 * Create the lttng run directory needed for all global sockets and pipe.
4069 */
4070 static int create_lttng_rundir(void)
4071 {
4072 int ret;
4073
4074 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
4075 if (ret < 0) {
4076 if (errno != EEXIST) {
4077 ERR("Unable to create " LTTNG_RUNDIR);
4078 goto error;
4079 } else {
4080 ret = 0;
4081 }
4082 }
4083
4084 error:
4085 return ret;
4086 }
4087
4088 /*
4089 * Setup sockets and directory needed by the kconsumerd communication with the
4090 * session daemon.
4091 */
4092 static int set_consumer_sockets(struct consumer_data *consumer_data)
4093 {
4094 int ret;
4095 const char *path;
4096
4097 switch (consumer_data->type) {
4098 case LTTNG_CONSUMER_KERNEL:
4099 path = KCONSUMERD_PATH;
4100 break;
4101 case LTTNG_CONSUMER64_UST:
4102 path = USTCONSUMERD64_PATH;
4103 break;
4104 case LTTNG_CONSUMER32_UST:
4105 path = USTCONSUMERD32_PATH;
4106 break;
4107 default:
4108 ERR("Consumer type unknown");
4109 ret = -EINVAL;
4110 goto error;
4111 }
4112
4113 ret = mkdir(path, S_IRWXU | S_IRWXG);
4114 if (ret < 0) {
4115 if (errno != EEXIST) {
4116 ERR("Failed to create %s", path);
4117 goto error;
4118 }
4119 ret = 0;
4120 }
4121
4122 /* Create the kconsumerd error unix socket */
4123 consumer_data->err_sock =
4124 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4125 if (consumer_data->err_sock < 0) {
4126 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4127 ret = -1;
4128 goto error;
4129 }
4130
4131 /* File permission MUST be 660 */
4132 ret = chmod(consumer_data->err_unix_sock_path,
4133 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4134 if (ret < 0) {
4135 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4136 perror("chmod");
4137 goto error;
4138 }
4139
4140 error:
4141 return ret;
4142 }
4143
4144 /*
4145 * Signal handler for the daemon
4146 *
4147 * Simply stop all worker threads, leaving main() return gracefully after
4148 * joining all threads and calling cleanup().
4149 */
4150 static void sighandler(int sig)
4151 {
4152 switch (sig) {
4153 case SIGPIPE:
4154 DBG("SIGPIPE catched");
4155 return;
4156 case SIGINT:
4157 DBG("SIGINT catched");
4158 stop_threads();
4159 break;
4160 case SIGTERM:
4161 DBG("SIGTERM catched");
4162 stop_threads();
4163 break;
4164 default:
4165 break;
4166 }
4167 }
4168
4169 /*
4170 * Setup signal handler for :
4171 * SIGINT, SIGTERM, SIGPIPE
4172 */
4173 static int set_signal_handler(void)
4174 {
4175 int ret = 0;
4176 struct sigaction sa;
4177 sigset_t sigset;
4178
4179 if ((ret = sigemptyset(&sigset)) < 0) {
4180 perror("sigemptyset");
4181 return ret;
4182 }
4183
4184 sa.sa_handler = sighandler;
4185 sa.sa_mask = sigset;
4186 sa.sa_flags = 0;
4187 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4188 perror("sigaction");
4189 return ret;
4190 }
4191
4192 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4193 perror("sigaction");
4194 return ret;
4195 }
4196
4197 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4198 perror("sigaction");
4199 return ret;
4200 }
4201
4202 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4203
4204 return ret;
4205 }
4206
4207 /*
4208 * Set open files limit to unlimited. This daemon can open a large number of
4209 * file descriptors in order to consumer multiple kernel traces.
4210 */
4211 static void set_ulimit(void)
4212 {
4213 int ret;
4214 struct rlimit lim;
4215
4216 /* The kernel does not allowed an infinite limit for open files */
4217 lim.rlim_cur = 65535;
4218 lim.rlim_max = 65535;
4219
4220 ret = setrlimit(RLIMIT_NOFILE, &lim);
4221 if (ret < 0) {
4222 perror("failed to set open files limit");
4223 }
4224 }
4225
4226 /*
4227 * main
4228 */
4229 int main(int argc, char **argv)
4230 {
4231 int ret = 0;
4232 void *status;
4233 const char *home_path;
4234
4235 tracepoint(sessiond_boot_start);
4236 rcu_register_thread();
4237
4238 /* Create thread quit pipe */
4239 if ((ret = init_thread_quit_pipe()) < 0) {
4240 goto error;
4241 }
4242
4243 setup_consumerd_path();
4244
4245 /* Parse arguments */
4246 progname = argv[0];
4247 if ((ret = parse_args(argc, argv) < 0)) {
4248 goto error;
4249 }
4250
4251 /* Daemonize */
4252 if (opt_daemon) {
4253 ret = daemon(0, 0);
4254 if (ret < 0) {
4255 perror("daemon");
4256 goto error;
4257 }
4258 }
4259
4260 /* Check if daemon is UID = 0 */
4261 is_root = !getuid();
4262
4263 if (is_root) {
4264 ret = create_lttng_rundir();
4265 if (ret < 0) {
4266 goto error;
4267 }
4268
4269 if (strlen(apps_unix_sock_path) == 0) {
4270 snprintf(apps_unix_sock_path, PATH_MAX,
4271 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4272 }
4273
4274 if (strlen(client_unix_sock_path) == 0) {
4275 snprintf(client_unix_sock_path, PATH_MAX,
4276 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4277 }
4278
4279 /* Set global SHM for ust */
4280 if (strlen(wait_shm_path) == 0) {
4281 snprintf(wait_shm_path, PATH_MAX,
4282 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4283 }
4284 } else {
4285 home_path = get_home_dir();
4286 if (home_path == NULL) {
4287 /* TODO: Add --socket PATH option */
4288 ERR("Can't get HOME directory for sockets creation.");
4289 ret = -EPERM;
4290 goto error;
4291 }
4292
4293 if (strlen(apps_unix_sock_path) == 0) {
4294 snprintf(apps_unix_sock_path, PATH_MAX,
4295 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4296 }
4297
4298 /* Set the cli tool unix socket path */
4299 if (strlen(client_unix_sock_path) == 0) {
4300 snprintf(client_unix_sock_path, PATH_MAX,
4301 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4302 }
4303
4304 /* Set global SHM for ust */
4305 if (strlen(wait_shm_path) == 0) {
4306 snprintf(wait_shm_path, PATH_MAX,
4307 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4308 }
4309 }
4310
4311 DBG("Client socket path %s", client_unix_sock_path);
4312 DBG("Application socket path %s", apps_unix_sock_path);
4313
4314 /*
4315 * See if daemon already exist.
4316 */
4317 if ((ret = check_existing_daemon()) < 0) {
4318 ERR("Already running daemon.\n");
4319 /*
4320 * We do not goto exit because we must not cleanup()
4321 * because a daemon is already running.
4322 */
4323 goto error;
4324 }
4325
4326 /* After this point, we can safely call cleanup() with "goto exit" */
4327
4328 /*
4329 * These actions must be executed as root. We do that *after* setting up
4330 * the sockets path because we MUST make the check for another daemon using
4331 * those paths *before* trying to set the kernel consumer sockets and init
4332 * kernel tracer.
4333 */
4334 if (is_root) {
4335 ret = set_consumer_sockets(&kconsumer_data);
4336 if (ret < 0) {
4337 goto exit;
4338 }
4339
4340 ret = set_consumer_sockets(&ustconsumer64_data);
4341 if (ret < 0) {
4342 goto exit;
4343 }
4344
4345 ret = set_consumer_sockets(&ustconsumer32_data);
4346 if (ret < 0) {
4347 goto exit;
4348 }
4349
4350 /* Setup kernel tracer */
4351 init_kernel_tracer();
4352
4353 /* Set ulimit for open files */
4354 set_ulimit();
4355 }
4356
4357 if ((ret = set_signal_handler()) < 0) {
4358 goto exit;
4359 }
4360
4361 /* Setup the needed unix socket */
4362 if ((ret = init_daemon_socket()) < 0) {
4363 goto exit;
4364 }
4365
4366 /* Set credentials to socket */
4367 if (is_root && ((ret = set_permissions()) < 0)) {
4368 goto exit;
4369 }
4370
4371 /* Get parent pid if -S, --sig-parent is specified. */
4372 if (opt_sig_parent) {
4373 ppid = getppid();
4374 }
4375
4376 /* Setup the kernel pipe for waking up the kernel thread */
4377 if ((ret = create_kernel_poll_pipe()) < 0) {
4378 goto exit;
4379 }
4380
4381 /* Setup the thread apps communication pipe. */
4382 if ((ret = create_apps_cmd_pipe()) < 0) {
4383 goto exit;
4384 }
4385
4386 /* Init UST command queue. */
4387 cds_wfq_init(&ust_cmd_queue.queue);
4388
4389 /* Init UST app hash table */
4390 ust_app_ht_alloc();
4391
4392 /*
4393 * Get session list pointer. This pointer MUST NOT be free(). This list is
4394 * statically declared in session.c
4395 */
4396 session_list_ptr = session_get_list();
4397
4398 /* Set up max poll set size */
4399 lttng_poll_set_max_size();
4400
4401 /* Create thread to manage the client socket */
4402 ret = pthread_create(&client_thread, NULL,
4403 thread_manage_clients, (void *) NULL);
4404 if (ret != 0) {
4405 perror("pthread_create clients");
4406 goto exit_client;
4407 }
4408
4409 /* Create thread to dispatch registration */
4410 ret = pthread_create(&dispatch_thread, NULL,
4411 thread_dispatch_ust_registration, (void *) NULL);
4412 if (ret != 0) {
4413 perror("pthread_create dispatch");
4414 goto exit_dispatch;
4415 }
4416
4417 /* Create thread to manage application registration. */
4418 ret = pthread_create(&reg_apps_thread, NULL,
4419 thread_registration_apps, (void *) NULL);
4420 if (ret != 0) {
4421 perror("pthread_create registration");
4422 goto exit_reg_apps;
4423 }
4424
4425 /* Create thread to manage application socket */
4426 ret = pthread_create(&apps_thread, NULL,
4427 thread_manage_apps, (void *) NULL);
4428 if (ret != 0) {
4429 perror("pthread_create apps");
4430 goto exit_apps;
4431 }
4432
4433 /* Create kernel thread to manage kernel event */
4434 ret = pthread_create(&kernel_thread, NULL,
4435 thread_manage_kernel, (void *) NULL);
4436 if (ret != 0) {
4437 perror("pthread_create kernel");
4438 goto exit_kernel;
4439 }
4440
4441 tracepoint(sessiond_boot_end);
4442
4443 ret = pthread_join(kernel_thread, &status);
4444 if (ret != 0) {
4445 perror("pthread_join");
4446 goto error; /* join error, exit without cleanup */
4447 }
4448
4449 exit_kernel:
4450 ret = pthread_join(apps_thread, &status);
4451 if (ret != 0) {
4452 perror("pthread_join");
4453 goto error; /* join error, exit without cleanup */
4454 }
4455
4456 exit_apps:
4457 ret = pthread_join(reg_apps_thread, &status);
4458 if (ret != 0) {
4459 perror("pthread_join");
4460 goto error; /* join error, exit without cleanup */
4461 }
4462
4463 exit_reg_apps:
4464 ret = pthread_join(dispatch_thread, &status);
4465 if (ret != 0) {
4466 perror("pthread_join");
4467 goto error; /* join error, exit without cleanup */
4468 }
4469
4470 exit_dispatch:
4471 ret = pthread_join(client_thread, &status);
4472 if (ret != 0) {
4473 perror("pthread_join");
4474 goto error; /* join error, exit without cleanup */
4475 }
4476
4477 ret = join_consumer_thread(&kconsumer_data);
4478 if (ret != 0) {
4479 perror("join_consumer");
4480 goto error; /* join error, exit without cleanup */
4481 }
4482
4483 exit_client:
4484 exit:
4485 /*
4486 * cleanup() is called when no other thread is running.
4487 */
4488 rcu_thread_online();
4489 cleanup();
4490 rcu_thread_offline();
4491 rcu_unregister_thread();
4492 if (!ret)
4493 exit(EXIT_SUCCESS);
4494 error:
4495 exit(EXIT_FAILURE);
4496 }
LTTng 2.0 tools and control repository
This page took 0.136093 seconds and 4 git commands to generate.