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822c1df7de1d86b5fefcc42d2f5a99e5564202d8
[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 /* Const values */
81 const char default_home_dir[] = DEFAULT_HOME_DIR;
82 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
83 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
84 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
85
86 /* Variables */
87 int opt_verbose; /* Not static for lttngerr.h */
88 int opt_verbose_consumer; /* Not static for lttngerr.h */
89 int opt_quiet; /* Not static for lttngerr.h */
90
91 const char *progname;
92 const char *opt_tracing_group;
93 static int opt_sig_parent;
94 static int opt_daemon;
95 static int is_root; /* Set to 1 if the daemon is running as root */
96 static pid_t ppid; /* Parent PID for --sig-parent option */
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock;
126 static int apps_sock;
127 static int kernel_tracer_fd;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_bin =
175 __stringify(CONFIG_CONSUMERD32_BIN);
176 static const char *consumerd64_bin =
177 __stringify(CONFIG_CONSUMERD64_BIN);
178 static const char *consumerd32_libdir =
179 __stringify(CONFIG_CONSUMERD32_LIBDIR);
180 static const char *consumerd64_libdir =
181 __stringify(CONFIG_CONSUMERD64_LIBDIR);
182
183 static
184 void setup_consumerd_path(void)
185 {
186 const char *bin, *libdir;
187
188 /*
189 * Allow INSTALL_BIN_PATH to be used as a target path for the
190 * native architecture size consumer if CONFIG_CONSUMER*_PATH
191 * has not been defined.
192 */
193 #if (CAA_BITS_PER_LONG == 32)
194 if (!consumerd32_bin[0]) {
195 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
196 }
197 if (!consumerd32_libdir[0]) {
198 consumerd32_libdir = INSTALL_LIB_PATH;
199 }
200 #elif (CAA_BITS_PER_LONG == 64)
201 if (!consumerd64_bin[0]) {
202 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
203 }
204 if (!consumerd64_libdir[0]) {
205 consumerd64_libdir = INSTALL_LIB_PATH;
206 }
207 #else
208 #error "Unknown bitness"
209 #endif
210
211 /*
212 * runtime env. var. overrides the build default.
213 */
214 bin = getenv("LTTNG_CONSUMERD32_BIN");
215 if (bin) {
216 consumerd32_bin = bin;
217 }
218 bin = getenv("LTTNG_CONSUMERD64_BIN");
219 if (bin) {
220 consumerd64_bin = bin;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
223 if (libdir) {
224 consumerd32_libdir = libdir;
225 }
226 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
227 if (libdir) {
228 consumerd64_libdir = libdir;
229 }
230 }
231
232 /*
233 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
234 */
235 static int create_thread_poll_set(struct lttng_poll_event *events,
236 unsigned int size)
237 {
238 int ret;
239
240 if (events == NULL || size == 0) {
241 ret = -1;
242 goto error;
243 }
244
245 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
246 if (ret < 0) {
247 goto error;
248 }
249
250 /* Add quit pipe */
251 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
252 if (ret < 0) {
253 goto error;
254 }
255
256 return 0;
257
258 error:
259 return ret;
260 }
261
262 /*
263 * Check if the thread quit pipe was triggered.
264 *
265 * Return 1 if it was triggered else 0;
266 */
267 static int check_thread_quit_pipe(int fd, uint32_t events)
268 {
269 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
270 return 1;
271 }
272
273 return 0;
274 }
275
276 /*
277 * Remove modules in reverse load order.
278 */
279 static int modprobe_remove_kernel_modules(void)
280 {
281 int ret = 0, i;
282 char modprobe[256];
283
284 for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) {
285 ret = snprintf(modprobe, sizeof(modprobe),
286 "/sbin/modprobe -r -q %s",
287 kernel_modules_list[i].name);
288 if (ret < 0) {
289 perror("snprintf modprobe -r");
290 goto error;
291 }
292 modprobe[sizeof(modprobe) - 1] = '\0';
293 ret = system(modprobe);
294 if (ret == -1) {
295 ERR("Unable to launch modprobe -r for module %s",
296 kernel_modules_list[i].name);
297 } else if (kernel_modules_list[i].required
298 && WEXITSTATUS(ret) != 0) {
299 ERR("Unable to remove module %s",
300 kernel_modules_list[i].name);
301 } else {
302 DBG("Modprobe removal successful %s",
303 kernel_modules_list[i].name);
304 }
305 }
306
307 error:
308 return ret;
309 }
310
311 /*
312 * Return group ID of the tracing group or -1 if not found.
313 */
314 static gid_t allowed_group(void)
315 {
316 struct group *grp;
317
318 if (opt_tracing_group) {
319 grp = getgrnam(opt_tracing_group);
320 } else {
321 grp = getgrnam(default_tracing_group);
322 }
323 if (!grp) {
324 return -1;
325 } else {
326 return grp->gr_gid;
327 }
328 }
329
330 /*
331 * Init thread quit pipe.
332 *
333 * Return -1 on error or 0 if all pipes are created.
334 */
335 static int init_thread_quit_pipe(void)
336 {
337 int ret;
338
339 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
340 if (ret < 0) {
341 perror("thread quit pipe");
342 goto error;
343 }
344
345 error:
346 return ret;
347 }
348
349 /*
350 * Complete teardown of a kernel session. This free all data structure related
351 * to a kernel session and update counter.
352 */
353 static void teardown_kernel_session(struct ltt_session *session)
354 {
355 if (!session->kernel_session) {
356 DBG3("No kernel session when tearingdown session");
357 return;
358 }
359
360 DBG("Tearing down kernel session");
361
362 /*
363 * If a custom kernel consumer was registered, close the socket before
364 * tearing down the complete kernel session structure
365 */
366 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
367 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
368 }
369
370 trace_kernel_destroy_session(session->kernel_session);
371 }
372
373 /*
374 * Complete teardown of all UST sessions. This will free everything on his path
375 * and destroy the core essence of all ust sessions :)
376 */
377 static void teardown_ust_session(struct ltt_session *session)
378 {
379 int ret;
380
381 if (!session->ust_session) {
382 DBG3("No UST session when tearingdown session");
383 return;
384 }
385
386 DBG("Tearing down UST session(s)");
387
388 ret = ust_app_destroy_trace_all(session->ust_session);
389 if (ret) {
390 ERR("Error in ust_app_destroy_trace_all");
391 }
392
393 trace_ust_destroy_session(session->ust_session);
394 }
395
396 /*
397 * Stop all threads by closing the thread quit pipe.
398 */
399 static void stop_threads(void)
400 {
401 int ret;
402
403 /* Stopping all threads */
404 DBG("Terminating all threads");
405 ret = notify_thread_pipe(thread_quit_pipe[1]);
406 if (ret < 0) {
407 ERR("write error on thread quit pipe");
408 }
409
410 /* Dispatch thread */
411 dispatch_thread_exit = 1;
412 futex_nto1_wake(&ust_cmd_queue.futex);
413 }
414
415 /*
416 * Cleanup the daemon
417 */
418 static void cleanup(void)
419 {
420 int ret;
421 char *cmd;
422 struct ltt_session *sess, *stmp;
423
424 DBG("Cleaning up");
425
426 if (is_root) {
427 DBG("Removing %s directory", LTTNG_RUNDIR);
428 ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR);
429 if (ret < 0) {
430 ERR("asprintf failed. Something is really wrong!");
431 }
432
433 /* Remove lttng run directory */
434 ret = system(cmd);
435 if (ret < 0) {
436 ERR("Unable to clean " LTTNG_RUNDIR);
437 }
438 }
439
440 DBG("Cleaning up all session");
441
442 /* Destroy session list mutex */
443 if (session_list_ptr != NULL) {
444 pthread_mutex_destroy(&session_list_ptr->lock);
445
446 /* Cleanup ALL session */
447 cds_list_for_each_entry_safe(sess, stmp,
448 &session_list_ptr->head, list) {
449 teardown_kernel_session(sess);
450 teardown_ust_session(sess);
451 free(sess);
452 }
453 }
454
455 DBG("Closing all UST sockets");
456 ust_app_clean_list();
457
458 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
459
460 DBG("Closing kernel fd");
461 close(kernel_tracer_fd);
462
463 if (is_root) {
464 DBG("Unloading kernel modules");
465 modprobe_remove_kernel_modules();
466 }
467
468 close(thread_quit_pipe[0]);
469 close(thread_quit_pipe[1]);
470
471 /* <fun> */
472 MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
473 "Matthew, BEET driven development works!%c[%dm",
474 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
475 /* </fun> */
476 }
477
478 /*
479 * Send data on a unix socket using the liblttsessiondcomm API.
480 *
481 * Return lttcomm error code.
482 */
483 static int send_unix_sock(int sock, void *buf, size_t len)
484 {
485 /* Check valid length */
486 if (len <= 0) {
487 return -1;
488 }
489
490 return lttcomm_send_unix_sock(sock, buf, len);
491 }
492
493 /*
494 * Free memory of a command context structure.
495 */
496 static void clean_command_ctx(struct command_ctx **cmd_ctx)
497 {
498 DBG("Clean command context structure");
499 if (*cmd_ctx) {
500 if ((*cmd_ctx)->llm) {
501 free((*cmd_ctx)->llm);
502 }
503 if ((*cmd_ctx)->lsm) {
504 free((*cmd_ctx)->lsm);
505 }
506 free(*cmd_ctx);
507 *cmd_ctx = NULL;
508 }
509 }
510
511 /*
512 * Send all stream fds of kernel channel to the consumer.
513 */
514 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
515 int sock, struct ltt_kernel_channel *channel)
516 {
517 int ret;
518 struct ltt_kernel_stream *stream;
519 struct lttcomm_consumer_msg lkm;
520
521 DBG("Sending streams of channel %s to kernel consumer",
522 channel->channel->name);
523
524 /* Send channel */
525 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
526 lkm.u.channel.channel_key = channel->fd;
527 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
528 lkm.u.channel.mmap_len = 0; /* for kernel */
529 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
530 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
531 if (ret < 0) {
532 perror("send consumer channel");
533 goto error;
534 }
535
536 /* Send streams */
537 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
538 if (!stream->fd) {
539 continue;
540 }
541 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
542 lkm.u.stream.channel_key = channel->fd;
543 lkm.u.stream.stream_key = stream->fd;
544 lkm.u.stream.state = stream->state;
545 lkm.u.stream.output = channel->channel->attr.output;
546 lkm.u.stream.mmap_len = 0; /* for kernel */
547 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
548 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
549 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
550 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
551 if (ret < 0) {
552 perror("send consumer stream");
553 goto error;
554 }
555 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
556 if (ret < 0) {
557 perror("send consumer stream ancillary data");
558 goto error;
559 }
560 }
561
562 DBG("consumer channel streams sent");
563
564 return 0;
565
566 error:
567 return ret;
568 }
569
570 /*
571 * Send all stream fds of the kernel session to the consumer.
572 */
573 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
574 struct ltt_kernel_session *session)
575 {
576 int ret;
577 struct ltt_kernel_channel *chan;
578 struct lttcomm_consumer_msg lkm;
579 int sock = session->consumer_fd;
580
581 DBG("Sending metadata stream fd");
582
583 /* Extra protection. It's NOT supposed to be set to 0 at this point */
584 if (session->consumer_fd == 0) {
585 session->consumer_fd = consumer_data->cmd_sock;
586 }
587
588 if (session->metadata_stream_fd != 0) {
589 /* Send metadata channel fd */
590 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
591 lkm.u.channel.channel_key = session->metadata->fd;
592 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
593 lkm.u.channel.mmap_len = 0; /* for kernel */
594 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
595 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
596 if (ret < 0) {
597 perror("send consumer channel");
598 goto error;
599 }
600
601 /* Send metadata stream fd */
602 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
603 lkm.u.stream.channel_key = session->metadata->fd;
604 lkm.u.stream.stream_key = session->metadata_stream_fd;
605 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
606 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
607 lkm.u.stream.mmap_len = 0; /* for kernel */
608 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
609 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
610 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
611 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
612 if (ret < 0) {
613 perror("send consumer stream");
614 goto error;
615 }
616 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
617 if (ret < 0) {
618 perror("send consumer stream");
619 goto error;
620 }
621 }
622
623 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
624 ret = send_kconsumer_channel_streams(consumer_data, sock, chan);
625 if (ret < 0) {
626 goto error;
627 }
628 }
629
630 DBG("consumer fds (metadata and channel streams) sent");
631
632 return 0;
633
634 error:
635 return ret;
636 }
637
638 /*
639 * Notify UST applications using the shm mmap futex.
640 */
641 static int notify_ust_apps(int active)
642 {
643 char *wait_shm_mmap;
644
645 DBG("Notifying applications of session daemon state: %d", active);
646
647 /* See shm.c for this call implying mmap, shm and futex calls */
648 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
649 if (wait_shm_mmap == NULL) {
650 goto error;
651 }
652
653 /* Wake waiting process */
654 futex_wait_update((int32_t *) wait_shm_mmap, active);
655
656 /* Apps notified successfully */
657 return 0;
658
659 error:
660 return -1;
661 }
662
663 /*
664 * Setup the outgoing data buffer for the response (llm) by allocating the
665 * right amount of memory and copying the original information from the lsm
666 * structure.
667 *
668 * Return total size of the buffer pointed by buf.
669 */
670 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
671 {
672 int ret, buf_size;
673
674 buf_size = size;
675
676 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
677 if (cmd_ctx->llm == NULL) {
678 perror("zmalloc");
679 ret = -ENOMEM;
680 goto error;
681 }
682
683 /* Copy common data */
684 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
685 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
686
687 cmd_ctx->llm->data_size = size;
688 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
689
690 return buf_size;
691
692 error:
693 return ret;
694 }
695
696 /*
697 * Update the kernel poll set of all channel fd available over all tracing
698 * session. Add the wakeup pipe at the end of the set.
699 */
700 static int update_kernel_poll(struct lttng_poll_event *events)
701 {
702 int ret;
703 struct ltt_session *session;
704 struct ltt_kernel_channel *channel;
705
706 DBG("Updating kernel poll set");
707
708 session_lock_list();
709 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
710 session_lock(session);
711 if (session->kernel_session == NULL) {
712 session_unlock(session);
713 continue;
714 }
715
716 cds_list_for_each_entry(channel,
717 &session->kernel_session->channel_list.head, list) {
718 /* Add channel fd to the kernel poll set */
719 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
720 if (ret < 0) {
721 session_unlock(session);
722 goto error;
723 }
724 DBG("Channel fd %d added to kernel set", channel->fd);
725 }
726 session_unlock(session);
727 }
728 session_unlock_list();
729
730 return 0;
731
732 error:
733 session_unlock_list();
734 return -1;
735 }
736
737 /*
738 * Find the channel fd from 'fd' over all tracing session. When found, check
739 * for new channel stream and send those stream fds to the kernel consumer.
740 *
741 * Useful for CPU hotplug feature.
742 */
743 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
744 {
745 int ret = 0;
746 struct ltt_session *session;
747 struct ltt_kernel_channel *channel;
748
749 DBG("Updating kernel streams for channel fd %d", fd);
750
751 session_lock_list();
752 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
753 session_lock(session);
754 if (session->kernel_session == NULL) {
755 session_unlock(session);
756 continue;
757 }
758
759 /* This is not suppose to be 0 but this is an extra security check */
760 if (session->kernel_session->consumer_fd == 0) {
761 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
762 }
763
764 cds_list_for_each_entry(channel,
765 &session->kernel_session->channel_list.head, list) {
766 if (channel->fd == fd) {
767 DBG("Channel found, updating kernel streams");
768 ret = kernel_open_channel_stream(channel);
769 if (ret < 0) {
770 goto error;
771 }
772
773 /*
774 * Have we already sent fds to the consumer? If yes, it means
775 * that tracing is started so it is safe to send our updated
776 * stream fds.
777 */
778 if (session->kernel_session->consumer_fds_sent == 1) {
779 ret = send_kconsumer_channel_streams(consumer_data,
780 session->kernel_session->consumer_fd, channel);
781 if (ret < 0) {
782 goto error;
783 }
784 }
785 goto error;
786 }
787 }
788 session_unlock(session);
789 }
790 session_unlock_list();
791 return ret;
792
793 error:
794 session_unlock(session);
795 session_unlock_list();
796 return ret;
797 }
798
799 /*
800 * For each tracing session, update newly registered apps.
801 */
802 static void update_ust_app(int app_sock)
803 {
804 struct ltt_session *sess, *stmp;
805
806 /* For all tracing session(s) */
807 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
808 if (sess->ust_session) {
809 ust_app_global_update(sess->ust_session, app_sock);
810 }
811 }
812 }
813
814 /*
815 * This thread manage event coming from the kernel.
816 *
817 * Features supported in this thread:
818 * -) CPU Hotplug
819 */
820 static void *thread_manage_kernel(void *data)
821 {
822 int ret, i, pollfd, update_poll_flag = 1;
823 uint32_t revents, nb_fd;
824 char tmp;
825 struct lttng_poll_event events;
826
827 DBG("Thread manage kernel started");
828
829 ret = create_thread_poll_set(&events, 2);
830 if (ret < 0) {
831 goto error;
832 }
833
834 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
835 if (ret < 0) {
836 goto error;
837 }
838
839 while (1) {
840 if (update_poll_flag == 1) {
841 /*
842 * Reset number of fd in the poll set. Always 2 since there is the thread
843 * quit pipe and the kernel pipe.
844 */
845 events.nb_fd = 2;
846
847 ret = update_kernel_poll(&events);
848 if (ret < 0) {
849 goto error;
850 }
851 update_poll_flag = 0;
852 }
853
854 nb_fd = LTTNG_POLL_GETNB(&events);
855
856 DBG("Thread kernel polling on %d fds", nb_fd);
857
858 /* Zeroed the poll events */
859 lttng_poll_reset(&events);
860
861 /* Poll infinite value of time */
862 ret = lttng_poll_wait(&events, -1);
863 if (ret < 0) {
864 goto error;
865 } else if (ret == 0) {
866 /* Should not happen since timeout is infinite */
867 ERR("Return value of poll is 0 with an infinite timeout.\n"
868 "This should not have happened! Continuing...");
869 continue;
870 }
871
872 for (i = 0; i < nb_fd; i++) {
873 /* Fetch once the poll data */
874 revents = LTTNG_POLL_GETEV(&events, i);
875 pollfd = LTTNG_POLL_GETFD(&events, i);
876
877 /* Thread quit pipe has been closed. Killing thread. */
878 ret = check_thread_quit_pipe(pollfd, revents);
879 if (ret) {
880 goto error;
881 }
882
883 /* Check for data on kernel pipe */
884 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
885 ret = read(kernel_poll_pipe[0], &tmp, 1);
886 update_poll_flag = 1;
887 continue;
888 } else {
889 /*
890 * New CPU detected by the kernel. Adding kernel stream to
891 * kernel session and updating the kernel consumer
892 */
893 if (revents & LPOLLIN) {
894 ret = update_kernel_stream(&kconsumer_data, pollfd);
895 if (ret < 0) {
896 continue;
897 }
898 break;
899 /*
900 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
901 * and unregister kernel stream at this point.
902 */
903 }
904 }
905 }
906 }
907
908 error:
909 DBG("Kernel thread dying");
910 close(kernel_poll_pipe[0]);
911 close(kernel_poll_pipe[1]);
912
913 lttng_poll_clean(&events);
914
915 return NULL;
916 }
917
918 /*
919 * This thread manage the consumer error sent back to the session daemon.
920 */
921 static void *thread_manage_consumer(void *data)
922 {
923 int sock = 0, i, ret, pollfd;
924 uint32_t revents, nb_fd;
925 enum lttcomm_return_code code;
926 struct lttng_poll_event events;
927 struct consumer_data *consumer_data = data;
928
929 DBG("[thread] Manage consumer started");
930
931 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
932 if (ret < 0) {
933 goto error;
934 }
935
936 /*
937 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
938 * Nothing more will be added to this poll set.
939 */
940 ret = create_thread_poll_set(&events, 2);
941 if (ret < 0) {
942 goto error;
943 }
944
945 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
946 if (ret < 0) {
947 goto error;
948 }
949
950 nb_fd = LTTNG_POLL_GETNB(&events);
951
952 /* Inifinite blocking call, waiting for transmission */
953 ret = lttng_poll_wait(&events, -1);
954 if (ret < 0) {
955 goto error;
956 }
957
958 for (i = 0; i < nb_fd; i++) {
959 /* Fetch once the poll data */
960 revents = LTTNG_POLL_GETEV(&events, i);
961 pollfd = LTTNG_POLL_GETFD(&events, i);
962
963 /* Thread quit pipe has been closed. Killing thread. */
964 ret = check_thread_quit_pipe(pollfd, revents);
965 if (ret) {
966 goto error;
967 }
968
969 /* Event on the registration socket */
970 if (pollfd == consumer_data->err_sock) {
971 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
972 ERR("consumer err socket poll error");
973 goto error;
974 }
975 }
976 }
977
978 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
979 if (sock < 0) {
980 goto error;
981 }
982
983 DBG2("Receiving code from consumer err_sock");
984
985 /* Getting status code from kconsumerd */
986 ret = lttcomm_recv_unix_sock(sock, &code,
987 sizeof(enum lttcomm_return_code));
988 if (ret <= 0) {
989 goto error;
990 }
991
992 if (code == CONSUMERD_COMMAND_SOCK_READY) {
993 consumer_data->cmd_sock =
994 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
995 if (consumer_data->cmd_sock < 0) {
996 sem_post(&consumer_data->sem);
997 PERROR("consumer connect");
998 goto error;
999 }
1000 /* Signal condition to tell that the kconsumerd is ready */
1001 sem_post(&consumer_data->sem);
1002 DBG("consumer command socket ready");
1003 } else {
1004 ERR("consumer error when waiting for SOCK_READY : %s",
1005 lttcomm_get_readable_code(-code));
1006 goto error;
1007 }
1008
1009 /* Remove the kconsumerd error sock since we've established a connexion */
1010 ret = lttng_poll_del(&events, consumer_data->err_sock);
1011 if (ret < 0) {
1012 goto error;
1013 }
1014
1015 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
1016 if (ret < 0) {
1017 goto error;
1018 }
1019
1020 /* Update number of fd */
1021 nb_fd = LTTNG_POLL_GETNB(&events);
1022
1023 /* Inifinite blocking call, waiting for transmission */
1024 ret = lttng_poll_wait(&events, -1);
1025 if (ret < 0) {
1026 goto error;
1027 }
1028
1029 for (i = 0; i < nb_fd; i++) {
1030 /* Fetch once the poll data */
1031 revents = LTTNG_POLL_GETEV(&events, i);
1032 pollfd = LTTNG_POLL_GETFD(&events, i);
1033
1034 /* Thread quit pipe has been closed. Killing thread. */
1035 ret = check_thread_quit_pipe(pollfd, revents);
1036 if (ret) {
1037 goto error;
1038 }
1039
1040 /* Event on the kconsumerd socket */
1041 if (pollfd == sock) {
1042 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1043 ERR("consumer err socket second poll error");
1044 goto error;
1045 }
1046 }
1047 }
1048
1049 /* Wait for any kconsumerd error */
1050 ret = lttcomm_recv_unix_sock(sock, &code,
1051 sizeof(enum lttcomm_return_code));
1052 if (ret <= 0) {
1053 ERR("consumer closed the command socket");
1054 goto error;
1055 }
1056
1057 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1058
1059 error:
1060 DBG("consumer thread dying");
1061 close(consumer_data->err_sock);
1062 close(consumer_data->cmd_sock);
1063 close(sock);
1064
1065 unlink(consumer_data->err_unix_sock_path);
1066 unlink(consumer_data->cmd_unix_sock_path);
1067 consumer_data->pid = 0;
1068
1069 lttng_poll_clean(&events);
1070
1071 return NULL;
1072 }
1073
1074 /*
1075 * This thread manage application communication.
1076 */
1077 static void *thread_manage_apps(void *data)
1078 {
1079 int i, ret, pollfd;
1080 uint32_t revents, nb_fd;
1081 struct ust_command ust_cmd;
1082 struct lttng_poll_event events;
1083
1084 DBG("[thread] Manage application started");
1085
1086 rcu_register_thread();
1087 rcu_thread_online();
1088
1089 ret = create_thread_poll_set(&events, 2);
1090 if (ret < 0) {
1091 goto error;
1092 }
1093
1094 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1095 if (ret < 0) {
1096 goto error;
1097 }
1098
1099 while (1) {
1100 /* Zeroed the events structure */
1101 lttng_poll_reset(&events);
1102
1103 nb_fd = LTTNG_POLL_GETNB(&events);
1104
1105 DBG("Apps thread polling on %d fds", nb_fd);
1106
1107 /* Inifinite blocking call, waiting for transmission */
1108 ret = lttng_poll_wait(&events, -1);
1109 if (ret < 0) {
1110 goto error;
1111 }
1112
1113 for (i = 0; i < nb_fd; i++) {
1114 /* Fetch once the poll data */
1115 revents = LTTNG_POLL_GETEV(&events, i);
1116 pollfd = LTTNG_POLL_GETFD(&events, i);
1117
1118 /* Thread quit pipe has been closed. Killing thread. */
1119 ret = check_thread_quit_pipe(pollfd, revents);
1120 if (ret) {
1121 goto error;
1122 }
1123
1124 /* Inspect the apps cmd pipe */
1125 if (pollfd == apps_cmd_pipe[0]) {
1126 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1127 ERR("Apps command pipe error");
1128 goto error;
1129 } else if (revents & LPOLLIN) {
1130 /* Empty pipe */
1131 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1132 if (ret < 0 || ret < sizeof(ust_cmd)) {
1133 perror("read apps cmd pipe");
1134 goto error;
1135 }
1136
1137 /* Register applicaton to the session daemon */
1138 ret = ust_app_register(&ust_cmd.reg_msg,
1139 ust_cmd.sock);
1140 if (ret == -ENOMEM) {
1141 goto error;
1142 } else if (ret < 0) {
1143 break;
1144 }
1145
1146 /*
1147 * Add channel(s) and event(s) to newly registered apps
1148 * from lttng global UST domain.
1149 */
1150 update_ust_app(ust_cmd.sock);
1151
1152 ret = ustctl_register_done(ust_cmd.sock);
1153 if (ret < 0) {
1154 /*
1155 * If the registration is not possible, we simply
1156 * unregister the apps and continue
1157 */
1158 ust_app_unregister(ust_cmd.sock);
1159 } else {
1160 /*
1161 * We just need here to monitor the close of the UST
1162 * socket and poll set monitor those by default.
1163 */
1164 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1165 if (ret < 0) {
1166 goto error;
1167 }
1168
1169 DBG("Apps with sock %d added to poll set",
1170 ust_cmd.sock);
1171 }
1172
1173 break;
1174 }
1175 } else {
1176 /*
1177 * At this point, we know that a registered application made
1178 * the event at poll_wait.
1179 */
1180 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1181 /* Removing from the poll set */
1182 ret = lttng_poll_del(&events, pollfd);
1183 if (ret < 0) {
1184 goto error;
1185 }
1186
1187 /* Socket closed on remote end. */
1188 ust_app_unregister(pollfd);
1189 break;
1190 }
1191 }
1192 }
1193 }
1194
1195 error:
1196 DBG("Application communication apps dying");
1197 close(apps_cmd_pipe[0]);
1198 close(apps_cmd_pipe[1]);
1199
1200 lttng_poll_clean(&events);
1201
1202 rcu_thread_offline();
1203 rcu_unregister_thread();
1204 return NULL;
1205 }
1206
1207 /*
1208 * Dispatch request from the registration threads to the application
1209 * communication thread.
1210 */
1211 static void *thread_dispatch_ust_registration(void *data)
1212 {
1213 int ret;
1214 struct cds_wfq_node *node;
1215 struct ust_command *ust_cmd = NULL;
1216
1217 DBG("[thread] Dispatch UST command started");
1218
1219 while (!dispatch_thread_exit) {
1220 /* Atomically prepare the queue futex */
1221 futex_nto1_prepare(&ust_cmd_queue.futex);
1222
1223 do {
1224 /* Dequeue command for registration */
1225 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1226 if (node == NULL) {
1227 DBG("Woken up but nothing in the UST command queue");
1228 /* Continue thread execution */
1229 break;
1230 }
1231
1232 ust_cmd = caa_container_of(node, struct ust_command, node);
1233
1234 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1235 " gid:%d sock:%d name:%s (version %d.%d)",
1236 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1237 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1238 ust_cmd->sock, ust_cmd->reg_msg.name,
1239 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1240 /*
1241 * Inform apps thread of the new application registration. This
1242 * call is blocking so we can be assured that the data will be read
1243 * at some point in time or wait to the end of the world :)
1244 */
1245 ret = write(apps_cmd_pipe[1], ust_cmd,
1246 sizeof(struct ust_command));
1247 if (ret < 0) {
1248 perror("write apps cmd pipe");
1249 if (errno == EBADF) {
1250 /*
1251 * We can't inform the application thread to process
1252 * registration. We will exit or else application
1253 * registration will not occur and tracing will never
1254 * start.
1255 */
1256 goto error;
1257 }
1258 }
1259 free(ust_cmd);
1260 } while (node != NULL);
1261
1262 /* Futex wait on queue. Blocking call on futex() */
1263 futex_nto1_wait(&ust_cmd_queue.futex);
1264 }
1265
1266 error:
1267 DBG("Dispatch thread dying");
1268 return NULL;
1269 }
1270
1271 /*
1272 * This thread manage application registration.
1273 */
1274 static void *thread_registration_apps(void *data)
1275 {
1276 int sock = 0, i, ret, pollfd;
1277 uint32_t revents, nb_fd;
1278 struct lttng_poll_event events;
1279 /*
1280 * Get allocated in this thread, enqueued to a global queue, dequeued and
1281 * freed in the manage apps thread.
1282 */
1283 struct ust_command *ust_cmd = NULL;
1284
1285 DBG("[thread] Manage application registration started");
1286
1287 ret = lttcomm_listen_unix_sock(apps_sock);
1288 if (ret < 0) {
1289 goto error;
1290 }
1291
1292 /*
1293 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1294 * more will be added to this poll set.
1295 */
1296 ret = create_thread_poll_set(&events, 2);
1297 if (ret < 0) {
1298 goto error;
1299 }
1300
1301 /* Add the application registration socket */
1302 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1303 if (ret < 0) {
1304 goto error;
1305 }
1306
1307 /* Notify all applications to register */
1308 ret = notify_ust_apps(1);
1309 if (ret < 0) {
1310 ERR("Failed to notify applications or create the wait shared memory.\n"
1311 "Execution continues but there might be problem for already\n"
1312 "running applications that wishes to register.");
1313 }
1314
1315 while (1) {
1316 DBG("Accepting application registration");
1317
1318 nb_fd = LTTNG_POLL_GETNB(&events);
1319
1320 /* Inifinite blocking call, waiting for transmission */
1321 ret = lttng_poll_wait(&events, -1);
1322 if (ret < 0) {
1323 goto error;
1324 }
1325
1326 for (i = 0; i < nb_fd; i++) {
1327 /* Fetch once the poll data */
1328 revents = LTTNG_POLL_GETEV(&events, i);
1329 pollfd = LTTNG_POLL_GETFD(&events, i);
1330
1331 /* Thread quit pipe has been closed. Killing thread. */
1332 ret = check_thread_quit_pipe(pollfd, revents);
1333 if (ret) {
1334 goto error;
1335 }
1336
1337 /* Event on the registration socket */
1338 if (pollfd == apps_sock) {
1339 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1340 ERR("Register apps socket poll error");
1341 goto error;
1342 } else if (revents & LPOLLIN) {
1343 sock = lttcomm_accept_unix_sock(apps_sock);
1344 if (sock < 0) {
1345 goto error;
1346 }
1347
1348 /* Create UST registration command for enqueuing */
1349 ust_cmd = zmalloc(sizeof(struct ust_command));
1350 if (ust_cmd == NULL) {
1351 perror("ust command zmalloc");
1352 goto error;
1353 }
1354
1355 /*
1356 * Using message-based transmissions to ensure we don't
1357 * have to deal with partially received messages.
1358 */
1359 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1360 sizeof(struct ust_register_msg));
1361 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1362 if (ret < 0) {
1363 perror("lttcomm_recv_unix_sock register apps");
1364 } else {
1365 ERR("Wrong size received on apps register");
1366 }
1367 free(ust_cmd);
1368 close(sock);
1369 continue;
1370 }
1371
1372 ust_cmd->sock = sock;
1373
1374 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1375 " gid:%d sock:%d name:%s (version %d.%d)",
1376 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1377 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1378 ust_cmd->sock, ust_cmd->reg_msg.name,
1379 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1380
1381 /*
1382 * Lock free enqueue the registration request. The red pill
1383 * has been taken! This apps will be part of the *system*.
1384 */
1385 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1386
1387 /*
1388 * Wake the registration queue futex. Implicit memory
1389 * barrier with the exchange in cds_wfq_enqueue.
1390 */
1391 futex_nto1_wake(&ust_cmd_queue.futex);
1392 }
1393 }
1394 }
1395 }
1396
1397 error:
1398 DBG("UST Registration thread dying");
1399
1400 /* Notify that the registration thread is gone */
1401 notify_ust_apps(0);
1402
1403 close(apps_sock);
1404 close(sock);
1405 unlink(apps_unix_sock_path);
1406
1407 lttng_poll_clean(&events);
1408
1409 return NULL;
1410 }
1411
1412 /*
1413 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1414 * exec or it will fails.
1415 */
1416 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1417 {
1418 int ret;
1419 struct timespec timeout;
1420
1421 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1422 timeout.tv_nsec = 0;
1423
1424 /* Setup semaphore */
1425 ret = sem_init(&consumer_data->sem, 0, 0);
1426 if (ret < 0) {
1427 PERROR("sem_init consumer semaphore");
1428 goto error;
1429 }
1430
1431 ret = pthread_create(&consumer_data->thread, NULL,
1432 thread_manage_consumer, consumer_data);
1433 if (ret != 0) {
1434 PERROR("pthread_create consumer");
1435 ret = -1;
1436 goto error;
1437 }
1438
1439 /* Get time for sem_timedwait absolute timeout */
1440 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1441 if (ret < 0) {
1442 PERROR("clock_gettime spawn consumer");
1443 /* Infinite wait for the kconsumerd thread to be ready */
1444 ret = sem_wait(&consumer_data->sem);
1445 } else {
1446 /* Normal timeout if the gettime was successful */
1447 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1448 ret = sem_timedwait(&consumer_data->sem, &timeout);
1449 }
1450
1451 if (ret < 0) {
1452 if (errno == ETIMEDOUT) {
1453 /*
1454 * Call has timed out so we kill the kconsumerd_thread and return
1455 * an error.
1456 */
1457 ERR("The consumer thread was never ready. Killing it");
1458 ret = pthread_cancel(consumer_data->thread);
1459 if (ret < 0) {
1460 PERROR("pthread_cancel consumer thread");
1461 }
1462 } else {
1463 PERROR("semaphore wait failed consumer thread");
1464 }
1465 goto error;
1466 }
1467
1468 pthread_mutex_lock(&consumer_data->pid_mutex);
1469 if (consumer_data->pid == 0) {
1470 ERR("Kconsumerd did not start");
1471 pthread_mutex_unlock(&consumer_data->pid_mutex);
1472 goto error;
1473 }
1474 pthread_mutex_unlock(&consumer_data->pid_mutex);
1475
1476 return 0;
1477
1478 error:
1479 return ret;
1480 }
1481
1482 /*
1483 * Join consumer thread
1484 */
1485 static int join_consumer_thread(struct consumer_data *consumer_data)
1486 {
1487 void *status;
1488 int ret;
1489
1490 if (consumer_data->pid != 0) {
1491 ret = kill(consumer_data->pid, SIGTERM);
1492 if (ret) {
1493 ERR("Error killing consumer daemon");
1494 return ret;
1495 }
1496 return pthread_join(consumer_data->thread, &status);
1497 } else {
1498 return 0;
1499 }
1500 }
1501
1502 /*
1503 * Fork and exec a consumer daemon (consumerd).
1504 *
1505 * Return pid if successful else -1.
1506 */
1507 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1508 {
1509 int ret;
1510 pid_t pid;
1511 const char *consumer_to_use;
1512 const char *verbosity;
1513 struct stat st;
1514
1515 DBG("Spawning consumerd");
1516
1517 pid = fork();
1518 if (pid == 0) {
1519 /*
1520 * Exec consumerd.
1521 */
1522 if (opt_verbose > 1 || opt_verbose_consumer) {
1523 verbosity = "--verbose";
1524 } else {
1525 verbosity = "--quiet";
1526 }
1527 switch (consumer_data->type) {
1528 case LTTNG_CONSUMER_KERNEL:
1529 /*
1530 * Find out which consumerd to execute. We will
1531 * first try the 64-bit path, then the
1532 * sessiond's installation directory, and
1533 * fallback on the 32-bit one,
1534 */
1535 if (stat(consumerd64_bin, &st) == 0) {
1536 consumer_to_use = consumerd64_bin;
1537 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1538 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1539 } else if (stat(consumerd32_bin, &st) == 0) {
1540 consumer_to_use = consumerd32_bin;
1541 } else {
1542 break;
1543 }
1544 DBG("Using kernel consumer at: %s", consumer_to_use);
1545 execl(consumer_to_use,
1546 "lttng-consumerd", verbosity, "-k",
1547 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1548 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1549 NULL);
1550 break;
1551 case LTTNG_CONSUMER64_UST:
1552 {
1553 char *tmpnew = NULL;
1554
1555 if (consumerd64_libdir[0] != '\0') {
1556 char *tmp;
1557 size_t tmplen;
1558
1559 tmp = getenv("LD_LIBRARY_PATH");
1560 if (!tmp) {
1561 tmp = "";
1562 }
1563 tmplen = strlen("LD_LIBRARY_PATH=")
1564 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1565 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1566 if (!tmpnew) {
1567 ret = -ENOMEM;
1568 goto error;
1569 }
1570 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1571 strcat(tmpnew, consumerd64_libdir);
1572 if (tmp[0] != '\0') {
1573 strcat(tmpnew, ":");
1574 strcat(tmpnew, tmp);
1575 }
1576 ret = putenv(tmpnew);
1577 if (ret) {
1578 ret = -errno;
1579 goto error;
1580 }
1581 }
1582 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1583 ret = execl(consumerd64_bin, verbosity, "-u",
1584 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1585 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1586 NULL);
1587 if (consumerd64_libdir[0] != '\0') {
1588 free(tmpnew);
1589 }
1590 if (ret) {
1591 goto error;
1592 }
1593 break;
1594 }
1595 case LTTNG_CONSUMER32_UST:
1596 {
1597 char *tmpnew = NULL;
1598
1599 if (consumerd32_libdir[0] != '\0') {
1600 char *tmp;
1601 size_t tmplen;
1602
1603 tmp = getenv("LD_LIBRARY_PATH");
1604 if (!tmp) {
1605 tmp = "";
1606 }
1607 tmplen = strlen("LD_LIBRARY_PATH=")
1608 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1609 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1610 if (!tmpnew) {
1611 ret = -ENOMEM;
1612 goto error;
1613 }
1614 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1615 strcat(tmpnew, consumerd32_libdir);
1616 if (tmp[0] != '\0') {
1617 strcat(tmpnew, ":");
1618 strcat(tmpnew, tmp);
1619 }
1620 ret = putenv(tmpnew);
1621 if (ret) {
1622 ret = -errno;
1623 goto error;
1624 }
1625 }
1626 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1627 ret = execl(consumerd32_bin, verbosity, "-u",
1628 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1629 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1630 NULL);
1631 if (consumerd32_libdir[0] != '\0') {
1632 free(tmpnew);
1633 }
1634 if (ret) {
1635 goto error;
1636 }
1637 break;
1638 }
1639 default:
1640 perror("unknown consumer type");
1641 exit(EXIT_FAILURE);
1642 }
1643 if (errno != 0) {
1644 perror("kernel start consumer exec");
1645 }
1646 exit(EXIT_FAILURE);
1647 } else if (pid > 0) {
1648 ret = pid;
1649 } else {
1650 perror("start consumer fork");
1651 ret = -errno;
1652 }
1653 error:
1654 return ret;
1655 }
1656
1657 /*
1658 * Spawn the consumerd daemon and session daemon thread.
1659 */
1660 static int start_consumerd(struct consumer_data *consumer_data)
1661 {
1662 int ret;
1663
1664 pthread_mutex_lock(&consumer_data->pid_mutex);
1665 if (consumer_data->pid != 0) {
1666 pthread_mutex_unlock(&consumer_data->pid_mutex);
1667 goto end;
1668 }
1669
1670 ret = spawn_consumerd(consumer_data);
1671 if (ret < 0) {
1672 ERR("Spawning consumerd failed");
1673 pthread_mutex_unlock(&consumer_data->pid_mutex);
1674 goto error;
1675 }
1676
1677 /* Setting up the consumer_data pid */
1678 consumer_data->pid = ret;
1679 DBG2("Consumer pid %d", consumer_data->pid);
1680 pthread_mutex_unlock(&consumer_data->pid_mutex);
1681
1682 DBG2("Spawning consumer control thread");
1683 ret = spawn_consumer_thread(consumer_data);
1684 if (ret < 0) {
1685 ERR("Fatal error spawning consumer control thread");
1686 goto error;
1687 }
1688
1689 end:
1690 return 0;
1691
1692 error:
1693 return ret;
1694 }
1695
1696 /*
1697 * modprobe_kernel_modules
1698 */
1699 static int modprobe_kernel_modules(void)
1700 {
1701 int ret = 0, i;
1702 char modprobe[256];
1703
1704 for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) {
1705 ret = snprintf(modprobe, sizeof(modprobe),
1706 "/sbin/modprobe %s%s",
1707 kernel_modules_list[i].required ? "" : "-q ",
1708 kernel_modules_list[i].name);
1709 if (ret < 0) {
1710 perror("snprintf modprobe");
1711 goto error;
1712 }
1713 modprobe[sizeof(modprobe) - 1] = '\0';
1714 ret = system(modprobe);
1715 if (ret == -1) {
1716 ERR("Unable to launch modprobe for module %s",
1717 kernel_modules_list[i].name);
1718 } else if (kernel_modules_list[i].required
1719 && WEXITSTATUS(ret) != 0) {
1720 ERR("Unable to load module %s",
1721 kernel_modules_list[i].name);
1722 } else {
1723 DBG("Modprobe successfully %s",
1724 kernel_modules_list[i].name);
1725 }
1726 }
1727
1728 error:
1729 return ret;
1730 }
1731
1732 /*
1733 * mount_debugfs
1734 */
1735 static int mount_debugfs(char *path)
1736 {
1737 int ret;
1738 char *type = "debugfs";
1739
1740 ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid());
1741 if (ret < 0) {
1742 PERROR("Cannot create debugfs path");
1743 goto error;
1744 }
1745
1746 ret = mount(type, path, type, 0, NULL);
1747 if (ret < 0) {
1748 PERROR("Cannot mount debugfs");
1749 goto error;
1750 }
1751
1752 DBG("Mounted debugfs successfully at %s", path);
1753
1754 error:
1755 return ret;
1756 }
1757
1758 /*
1759 * Setup necessary data for kernel tracer action.
1760 */
1761 static void init_kernel_tracer(void)
1762 {
1763 int ret;
1764 char *proc_mounts = "/proc/mounts";
1765 char line[256];
1766 char *debugfs_path = NULL, *lttng_path = NULL;
1767 FILE *fp;
1768
1769 /* Detect debugfs */
1770 fp = fopen(proc_mounts, "r");
1771 if (fp == NULL) {
1772 ERR("Unable to probe %s", proc_mounts);
1773 goto error;
1774 }
1775
1776 while (fgets(line, sizeof(line), fp) != NULL) {
1777 if (strstr(line, "debugfs") != NULL) {
1778 /* Remove first string */
1779 strtok(line, " ");
1780 /* Dup string here so we can reuse line later on */
1781 debugfs_path = strdup(strtok(NULL, " "));
1782 DBG("Got debugfs path : %s", debugfs_path);
1783 break;
1784 }
1785 }
1786
1787 fclose(fp);
1788
1789 /* Mount debugfs if needded */
1790 if (debugfs_path == NULL) {
1791 ret = asprintf(&debugfs_path, "/mnt/debugfs");
1792 if (ret < 0) {
1793 perror("asprintf debugfs path");
1794 goto error;
1795 }
1796 ret = mount_debugfs(debugfs_path);
1797 if (ret < 0) {
1798 perror("Cannot mount debugfs");
1799 goto error;
1800 }
1801 }
1802
1803 /* Modprobe lttng kernel modules */
1804 ret = modprobe_kernel_modules();
1805 if (ret < 0) {
1806 goto error;
1807 }
1808
1809 /* Setup lttng kernel path */
1810 ret = asprintf(&lttng_path, "%s/lttng", debugfs_path);
1811 if (ret < 0) {
1812 perror("asprintf lttng path");
1813 goto error;
1814 }
1815
1816 /* Open debugfs lttng */
1817 kernel_tracer_fd = open(lttng_path, O_RDWR);
1818 if (kernel_tracer_fd < 0) {
1819 DBG("Failed to open %s", lttng_path);
1820 goto error;
1821 }
1822
1823 free(lttng_path);
1824 free(debugfs_path);
1825 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1826 return;
1827
1828 error:
1829 if (lttng_path) {
1830 free(lttng_path);
1831 }
1832 if (debugfs_path) {
1833 free(debugfs_path);
1834 }
1835 WARN("No kernel tracer available");
1836 kernel_tracer_fd = 0;
1837 return;
1838 }
1839
1840 /*
1841 * Init tracing by creating trace directory and sending fds kernel consumer.
1842 */
1843 static int init_kernel_tracing(struct ltt_kernel_session *session)
1844 {
1845 int ret = 0;
1846
1847 if (session->consumer_fds_sent == 0) {
1848 /*
1849 * Assign default kernel consumer socket if no consumer assigned to the
1850 * kernel session. At this point, it's NOT suppose to be 0 but this is
1851 * an extra security check.
1852 */
1853 if (session->consumer_fd == 0) {
1854 session->consumer_fd = kconsumer_data.cmd_sock;
1855 }
1856
1857 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1858 if (ret < 0) {
1859 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1860 goto error;
1861 }
1862
1863 session->consumer_fds_sent = 1;
1864 }
1865
1866 error:
1867 return ret;
1868 }
1869
1870 /*
1871 * Create an UST session and add it to the session ust list.
1872 */
1873 static int create_ust_session(struct ltt_session *session,
1874 struct lttng_domain *domain)
1875 {
1876 int ret;
1877 unsigned int uid;
1878 struct ltt_ust_session *lus = NULL;
1879
1880 switch (domain->type) {
1881 case LTTNG_DOMAIN_UST:
1882 break;
1883 default:
1884 ret = LTTCOMM_UNKNOWN_DOMAIN;
1885 goto error;
1886 }
1887
1888 DBG("Creating UST session");
1889
1890 uid = session->uid;
1891 lus = trace_ust_create_session(session->path, uid, domain);
1892 if (lus == NULL) {
1893 ret = LTTCOMM_UST_SESS_FAIL;
1894 goto error;
1895 }
1896
1897 ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1898 geteuid(), allowed_group());
1899 if (ret < 0) {
1900 if (ret != -EEXIST) {
1901 ERR("Trace directory creation error");
1902 ret = LTTCOMM_UST_SESS_FAIL;
1903 goto error;
1904 }
1905 }
1906
1907 /* The domain type dictate different actions on session creation */
1908 switch (domain->type) {
1909 case LTTNG_DOMAIN_UST:
1910 /* No ustctl for the global UST domain */
1911 break;
1912 default:
1913 ERR("Unknown UST domain on create session %d", domain->type);
1914 goto error;
1915 }
1916 session->ust_session = lus;
1917
1918 return LTTCOMM_OK;
1919
1920 error:
1921 free(lus);
1922 return ret;
1923 }
1924
1925 /*
1926 * Create a kernel tracer session then create the default channel.
1927 */
1928 static int create_kernel_session(struct ltt_session *session)
1929 {
1930 int ret;
1931
1932 DBG("Creating kernel session");
1933
1934 ret = kernel_create_session(session, kernel_tracer_fd);
1935 if (ret < 0) {
1936 ret = LTTCOMM_KERN_SESS_FAIL;
1937 goto error;
1938 }
1939
1940 /* Set kernel consumer socket fd */
1941 if (kconsumer_data.cmd_sock) {
1942 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1943 }
1944
1945 ret = mkdir_recursive(session->kernel_session->trace_path,
1946 S_IRWXU | S_IRWXG, geteuid(), allowed_group());
1947 if (ret < 0) {
1948 if (ret != -EEXIST) {
1949 ERR("Trace directory creation error");
1950 goto error;
1951 }
1952 }
1953
1954 error:
1955 return ret;
1956 }
1957
1958 /*
1959 * Using the session list, filled a lttng_session array to send back to the
1960 * client for session listing.
1961 *
1962 * The session list lock MUST be acquired before calling this function. Use
1963 * session_lock_list() and session_unlock_list().
1964 */
1965 static void list_lttng_sessions(struct lttng_session *sessions)
1966 {
1967 int i = 0;
1968 struct ltt_session *session;
1969
1970 DBG("Getting all available session");
1971 /*
1972 * Iterate over session list and append data after the control struct in
1973 * the buffer.
1974 */
1975 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1976 strncpy(sessions[i].path, session->path, PATH_MAX);
1977 sessions[i].path[PATH_MAX - 1] = '\0';
1978 strncpy(sessions[i].name, session->name, NAME_MAX);
1979 sessions[i].name[NAME_MAX - 1] = '\0';
1980 sessions[i].enabled = session->enabled;
1981 i++;
1982 }
1983 }
1984
1985 /*
1986 * Fill lttng_channel array of all channels.
1987 */
1988 static void list_lttng_channels(int domain, struct ltt_session *session,
1989 struct lttng_channel *channels)
1990 {
1991 int i = 0;
1992 struct ltt_kernel_channel *kchan;
1993
1994 DBG("Listing channels for session %s", session->name);
1995
1996 switch (domain) {
1997 case LTTNG_DOMAIN_KERNEL:
1998 /* Kernel channels */
1999 if (session->kernel_session != NULL) {
2000 cds_list_for_each_entry(kchan,
2001 &session->kernel_session->channel_list.head, list) {
2002 /* Copy lttng_channel struct to array */
2003 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
2004 channels[i].enabled = kchan->enabled;
2005 i++;
2006 }
2007 }
2008 break;
2009 case LTTNG_DOMAIN_UST:
2010 {
2011 struct cds_lfht_iter iter;
2012 struct ltt_ust_channel *uchan;
2013
2014 cds_lfht_for_each_entry(session->ust_session->domain_global.channels,
2015 &iter, uchan, node) {
2016 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
2017 channels[i].attr.overwrite = uchan->attr.overwrite;
2018 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
2019 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
2020 channels[i].attr.switch_timer_interval =
2021 uchan->attr.switch_timer_interval;
2022 channels[i].attr.read_timer_interval =
2023 uchan->attr.read_timer_interval;
2024 channels[i].enabled = uchan->enabled;
2025 switch (uchan->attr.output) {
2026 case LTTNG_UST_MMAP:
2027 default:
2028 channels[i].attr.output = LTTNG_EVENT_MMAP;
2029 break;
2030 }
2031 i++;
2032 }
2033 break;
2034 }
2035 default:
2036 break;
2037 }
2038 }
2039
2040 /*
2041 * Create a list of ust global domain events.
2042 */
2043 static int list_lttng_ust_global_events(char *channel_name,
2044 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
2045 {
2046 int i = 0, ret = 0;
2047 unsigned int nb_event = 0;
2048 struct cds_lfht_iter iter;
2049 struct cds_lfht_node *node;
2050 struct ltt_ust_channel *uchan;
2051 struct ltt_ust_event *uevent;
2052 struct lttng_event *tmp;
2053
2054 DBG("Listing UST global events for channel %s", channel_name);
2055
2056 rcu_read_lock();
2057
2058 node = hashtable_lookup(ust_global->channels, (void *) channel_name,
2059 strlen(channel_name), &iter);
2060 if (node == NULL) {
2061 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2062 goto error;
2063 }
2064
2065 uchan = caa_container_of(node, struct ltt_ust_channel, node);
2066
2067 nb_event += hashtable_get_count(uchan->events);
2068
2069 if (nb_event == 0) {
2070 ret = nb_event;
2071 goto error;
2072 }
2073
2074 DBG3("Listing UST global %d events", nb_event);
2075
2076 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2077 if (tmp == NULL) {
2078 ret = -LTTCOMM_FATAL;
2079 goto error;
2080 }
2081
2082 cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
2083 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2084 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2085 tmp[i].enabled = uevent->enabled;
2086 switch (uevent->attr.instrumentation) {
2087 case LTTNG_UST_TRACEPOINT:
2088 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2089 break;
2090 case LTTNG_UST_PROBE:
2091 tmp[i].type = LTTNG_EVENT_PROBE;
2092 break;
2093 case LTTNG_UST_FUNCTION:
2094 tmp[i].type = LTTNG_EVENT_FUNCTION;
2095 break;
2096 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2097 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2098 break;
2099 }
2100 i++;
2101 }
2102
2103 ret = nb_event;
2104 *events = tmp;
2105
2106 error:
2107 rcu_read_unlock();
2108 return ret;
2109 }
2110
2111 /*
2112 * Fill lttng_event array of all kernel events in the channel.
2113 */
2114 static int list_lttng_kernel_events(char *channel_name,
2115 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2116 {
2117 int i = 0, ret;
2118 unsigned int nb_event;
2119 struct ltt_kernel_event *event;
2120 struct ltt_kernel_channel *kchan;
2121
2122 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2123 if (kchan == NULL) {
2124 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2125 goto error;
2126 }
2127
2128 nb_event = kchan->event_count;
2129
2130 DBG("Listing events for channel %s", kchan->channel->name);
2131
2132 if (nb_event == 0) {
2133 ret = nb_event;
2134 goto error;
2135 }
2136
2137 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2138 if (*events == NULL) {
2139 ret = LTTCOMM_FATAL;
2140 goto error;
2141 }
2142
2143 /* Kernel channels */
2144 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2145 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2146 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2147 (*events)[i].enabled = event->enabled;
2148 switch (event->event->instrumentation) {
2149 case LTTNG_KERNEL_TRACEPOINT:
2150 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2151 break;
2152 case LTTNG_KERNEL_KPROBE:
2153 case LTTNG_KERNEL_KRETPROBE:
2154 (*events)[i].type = LTTNG_EVENT_PROBE;
2155 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2156 sizeof(struct lttng_kernel_kprobe));
2157 break;
2158 case LTTNG_KERNEL_FUNCTION:
2159 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2160 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2161 sizeof(struct lttng_kernel_function));
2162 break;
2163 case LTTNG_KERNEL_NOOP:
2164 (*events)[i].type = LTTNG_EVENT_NOOP;
2165 break;
2166 case LTTNG_KERNEL_SYSCALL:
2167 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2168 break;
2169 case LTTNG_KERNEL_ALL:
2170 assert(0);
2171 break;
2172 }
2173 i++;
2174 }
2175
2176 return nb_event;
2177
2178 error:
2179 return ret;
2180 }
2181
2182 /*
2183 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2184 */
2185 static int cmd_disable_channel(struct ltt_session *session,
2186 int domain, char *channel_name)
2187 {
2188 int ret;
2189 struct ltt_ust_session *usess;
2190
2191 usess = session->ust_session;
2192
2193 switch (domain) {
2194 case LTTNG_DOMAIN_KERNEL:
2195 {
2196 ret = channel_kernel_disable(session->kernel_session,
2197 channel_name);
2198 if (ret != LTTCOMM_OK) {
2199 goto error;
2200 }
2201
2202 kernel_wait_quiescent(kernel_tracer_fd);
2203 break;
2204 }
2205 case LTTNG_DOMAIN_UST:
2206 {
2207 struct ltt_ust_channel *uchan;
2208
2209 /* Get channel in global UST domain HT */
2210 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2211 channel_name);
2212 if (uchan == NULL) {
2213 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2214 goto error;
2215 }
2216
2217 /* Already disabled */
2218 if (!uchan->enabled) {
2219 DBG2("UST channel %s already disabled", channel_name);
2220 break;
2221 }
2222
2223 ret = ust_app_disable_channel_glb(usess, uchan);
2224 if (ret < 0) {
2225 ret = LTTCOMM_UST_DISABLE_FAIL;
2226 goto error;
2227 }
2228
2229 uchan->enabled = 0;
2230
2231 break;
2232 }
2233 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2234 case LTTNG_DOMAIN_UST_EXEC_NAME:
2235 case LTTNG_DOMAIN_UST_PID:
2236 ret = LTTCOMM_NOT_IMPLEMENTED;
2237 goto error;
2238 default:
2239 ret = LTTCOMM_UNKNOWN_DOMAIN;
2240 goto error;
2241 }
2242
2243 ret = LTTCOMM_OK;
2244
2245 error:
2246 return ret;
2247 }
2248
2249 /*
2250 * Copy channel from attributes and set it in the application channel list.
2251 */
2252 /*
2253 static int copy_ust_channel_to_app(struct ltt_ust_session *usess,
2254 struct lttng_channel *attr, struct ust_app *app)
2255 {
2256 int ret;
2257 struct ltt_ust_channel *uchan, *new_chan;
2258
2259 uchan = trace_ust_get_channel_by_key(usess->channels, attr->name);
2260 if (uchan == NULL) {
2261 ret = LTTCOMM_FATAL;
2262 goto error;
2263 }
2264
2265 new_chan = trace_ust_create_channel(attr, usess->path);
2266 if (new_chan == NULL) {
2267 PERROR("malloc ltt_ust_channel");
2268 ret = LTTCOMM_FATAL;
2269 goto error;
2270 }
2271
2272 ret = channel_ust_copy(new_chan, uchan);
2273 if (ret < 0) {
2274 ret = LTTCOMM_FATAL;
2275 goto error;
2276 }
2277
2278 error:
2279 return ret;
2280 }
2281 */
2282
2283 /*
2284 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2285 */
2286 static int cmd_enable_channel(struct ltt_session *session,
2287 int domain, struct lttng_channel *attr)
2288 {
2289 int ret;
2290 struct ltt_ust_session *usess = session->ust_session;
2291
2292 DBG("Enabling channel %s for session %s", attr->name, session->name);
2293
2294 switch (domain) {
2295 case LTTNG_DOMAIN_KERNEL:
2296 {
2297 struct ltt_kernel_channel *kchan;
2298
2299 kchan = trace_kernel_get_channel_by_name(attr->name,
2300 session->kernel_session);
2301 if (kchan == NULL) {
2302 ret = channel_kernel_create(session->kernel_session,
2303 attr, kernel_poll_pipe[1]);
2304 } else {
2305 ret = channel_kernel_enable(session->kernel_session, kchan);
2306 }
2307
2308 if (ret != LTTCOMM_OK) {
2309 goto error;
2310 }
2311
2312 kernel_wait_quiescent(kernel_tracer_fd);
2313 break;
2314 }
2315 case LTTNG_DOMAIN_UST:
2316 {
2317 struct ltt_ust_channel *uchan;
2318
2319 DBG2("Enabling channel for LTTNG_DOMAIN_UST");
2320
2321 /* Get channel in global UST domain HT */
2322 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2323 attr->name);
2324 if (uchan == NULL) {
2325 uchan = trace_ust_create_channel(attr, usess->pathname);
2326 if (uchan == NULL) {
2327 ret = LTTCOMM_UST_CHAN_FAIL;
2328 goto error;
2329 }
2330
2331 /* Add channel to all registered applications */
2332 ret = ust_app_create_channel_glb(usess, uchan);
2333 if (ret != 0) {
2334 ret = LTTCOMM_UST_CHAN_FAIL;
2335 goto error;
2336 }
2337
2338 rcu_read_lock();
2339 hashtable_add_unique(usess->domain_global.channels, &uchan->node);
2340 rcu_read_unlock();
2341
2342 DBG2("UST channel %s added to global domain HT", attr->name);
2343 } else {
2344 /* If already enabled, everything is OK */
2345 if (uchan->enabled) {
2346 break;
2347 }
2348
2349 ret = ust_app_enable_channel_glb(usess, uchan);
2350 if (ret < 0) {
2351 if (ret != -EEXIST) {
2352 ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
2353 goto error;
2354 } else {
2355 ret = LTTCOMM_OK;
2356 }
2357 }
2358 }
2359
2360 uchan->enabled = 1;
2361
2362 break;
2363 }
2364 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2365 case LTTNG_DOMAIN_UST_EXEC_NAME:
2366 case LTTNG_DOMAIN_UST_PID:
2367 ret = LTTCOMM_NOT_IMPLEMENTED;
2368 goto error;
2369 default:
2370 ret = LTTCOMM_UNKNOWN_DOMAIN;
2371 goto error;
2372 }
2373
2374 ret = LTTCOMM_OK;
2375
2376 error:
2377 return ret;
2378 }
2379
2380 /*
2381 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2382 */
2383 static int cmd_disable_event(struct ltt_session *session, int domain,
2384 char *channel_name, char *event_name)
2385 {
2386 int ret;
2387
2388 switch (domain) {
2389 case LTTNG_DOMAIN_KERNEL:
2390 {
2391 struct ltt_kernel_channel *kchan;
2392 struct ltt_kernel_session *ksess;
2393
2394 ksess = session->kernel_session;
2395
2396 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2397 if (kchan == NULL) {
2398 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2399 goto error;
2400 }
2401
2402 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2403 if (ret != LTTCOMM_OK) {
2404 goto error;
2405 }
2406
2407 kernel_wait_quiescent(kernel_tracer_fd);
2408 break;
2409 }
2410 case LTTNG_DOMAIN_UST:
2411 {
2412 struct ltt_ust_channel *uchan;
2413 struct ltt_ust_session *usess;
2414
2415 usess = session->ust_session;
2416
2417 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2418 channel_name);
2419 if (uchan == NULL) {
2420 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2421 goto error;
2422 }
2423
2424 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2425 if (ret != LTTCOMM_OK) {
2426 goto error;
2427 }
2428
2429 DBG3("Disable UST event %s in channel %s completed", event_name,
2430 channel_name);
2431 break;
2432 }
2433 case LTTNG_DOMAIN_UST_EXEC_NAME:
2434 case LTTNG_DOMAIN_UST_PID:
2435 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2436 default:
2437 ret = LTTCOMM_NOT_IMPLEMENTED;
2438 goto error;
2439 }
2440
2441 ret = LTTCOMM_OK;
2442
2443 error:
2444 return ret;
2445 }
2446
2447 /*
2448 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2449 */
2450 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2451 char *channel_name)
2452 {
2453 int ret;
2454
2455 switch (domain) {
2456 case LTTNG_DOMAIN_KERNEL:
2457 {
2458 struct ltt_kernel_session *ksess;
2459 struct ltt_kernel_channel *kchan;
2460
2461 ksess = session->kernel_session;
2462
2463 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2464 if (kchan == NULL) {
2465 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2466 goto error;
2467 }
2468
2469 ret = event_kernel_disable_all(ksess, kchan);
2470 if (ret != LTTCOMM_OK) {
2471 goto error;
2472 }
2473
2474 kernel_wait_quiescent(kernel_tracer_fd);
2475 break;
2476 }
2477 case LTTNG_DOMAIN_UST:
2478 {
2479 struct ltt_ust_session *usess;
2480 struct ltt_ust_channel *uchan;
2481
2482 usess = session->ust_session;
2483
2484 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2485 channel_name);
2486 if (uchan == NULL) {
2487 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2488 goto error;
2489 }
2490
2491 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2492 if (ret != 0) {
2493 goto error;
2494 }
2495
2496 DBG3("Disable all UST events in channel %s completed", channel_name);
2497
2498 break;
2499 }
2500 case LTTNG_DOMAIN_UST_EXEC_NAME:
2501 case LTTNG_DOMAIN_UST_PID:
2502 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2503 default:
2504 ret = LTTCOMM_NOT_IMPLEMENTED;
2505 goto error;
2506 }
2507
2508 ret = LTTCOMM_OK;
2509
2510 error:
2511 return ret;
2512 }
2513
2514 /*
2515 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2516 */
2517 static int cmd_add_context(struct ltt_session *session, int domain,
2518 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2519 {
2520 int ret;
2521
2522 switch (domain) {
2523 case LTTNG_DOMAIN_KERNEL:
2524 /* Add kernel context to kernel tracer */
2525 ret = context_kernel_add(session->kernel_session, ctx,
2526 event_name, channel_name);
2527 if (ret != LTTCOMM_OK) {
2528 goto error;
2529 }
2530 break;
2531 case LTTNG_DOMAIN_UST:
2532 {
2533 struct ltt_ust_session *usess = session->ust_session;
2534
2535 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2536 if (ret != LTTCOMM_OK) {
2537 goto error;
2538 }
2539 break;
2540 }
2541 case LTTNG_DOMAIN_UST_EXEC_NAME:
2542 case LTTNG_DOMAIN_UST_PID:
2543 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2544 default:
2545 ret = LTTCOMM_NOT_IMPLEMENTED;
2546 goto error;
2547 }
2548
2549 ret = LTTCOMM_OK;
2550
2551 error:
2552 return ret;
2553 }
2554
2555 /*
2556 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2557 *
2558 * TODO: currently, both events and loglevels are kept within the same
2559 * namespace for UST global registry/app registery, so if an event
2560 * happen to have the same name as the loglevel (very unlikely though),
2561 * and an attempt is made to enable/disable both in the same session,
2562 * the first to be created will be the only one allowed to exist.
2563 */
2564 static int cmd_enable_event(struct ltt_session *session, int domain,
2565 char *channel_name, struct lttng_event *event)
2566 {
2567 int ret;
2568 struct lttng_channel *attr;
2569 struct ltt_ust_session *usess = session->ust_session;
2570
2571 switch (domain) {
2572 case LTTNG_DOMAIN_KERNEL:
2573 {
2574 struct ltt_kernel_channel *kchan;
2575
2576 kchan = trace_kernel_get_channel_by_name(channel_name,
2577 session->kernel_session);
2578 if (kchan == NULL) {
2579 attr = channel_new_default_attr(domain);
2580 if (attr == NULL) {
2581 ret = LTTCOMM_FATAL;
2582 goto error;
2583 }
2584 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2585
2586 /* This call will notify the kernel thread */
2587 ret = channel_kernel_create(session->kernel_session,
2588 attr, kernel_poll_pipe[1]);
2589 if (ret != LTTCOMM_OK) {
2590 free(attr);
2591 goto error;
2592 }
2593 free(attr);
2594 }
2595
2596 /* Get the newly created kernel channel pointer */
2597 kchan = trace_kernel_get_channel_by_name(channel_name,
2598 session->kernel_session);
2599 if (kchan == NULL) {
2600 /* This sould not happen... */
2601 ret = LTTCOMM_FATAL;
2602 goto error;
2603 }
2604
2605 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2606 event);
2607 if (ret != LTTCOMM_OK) {
2608 goto error;
2609 }
2610
2611 kernel_wait_quiescent(kernel_tracer_fd);
2612 break;
2613 }
2614 case LTTNG_DOMAIN_UST:
2615 {
2616 struct lttng_channel *attr;
2617 struct ltt_ust_channel *uchan;
2618
2619 /* Get channel from global UST domain */
2620 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2621 channel_name);
2622 if (uchan == NULL) {
2623 /* Create default channel */
2624 attr = channel_new_default_attr(domain);
2625 if (attr == NULL) {
2626 ret = LTTCOMM_FATAL;
2627 goto error;
2628 }
2629 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2630 attr->name[NAME_MAX - 1] = '\0';
2631
2632 /* Use the internal command enable channel */
2633 ret = cmd_enable_channel(session, domain, attr);
2634 if (ret != LTTCOMM_OK) {
2635 free(attr);
2636 goto error;
2637 }
2638 free(attr);
2639
2640 /* Get the newly created channel reference back */
2641 uchan = trace_ust_find_channel_by_name(
2642 usess->domain_global.channels, channel_name);
2643 if (uchan == NULL) {
2644 /* Something is really wrong */
2645 ret = LTTCOMM_FATAL;
2646 goto error;
2647 }
2648 }
2649
2650 /* At this point, the session and channel exist on the tracer */
2651
2652 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2653 if (ret != LTTCOMM_OK) {
2654 goto error;
2655 }
2656 break;
2657 }
2658 case LTTNG_DOMAIN_UST_EXEC_NAME:
2659 case LTTNG_DOMAIN_UST_PID:
2660 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2661 default:
2662 ret = LTTCOMM_NOT_IMPLEMENTED;
2663 goto error;
2664 }
2665
2666 ret = LTTCOMM_OK;
2667
2668 error:
2669 return ret;
2670 }
2671
2672 /*
2673 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2674 */
2675 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2676 char *channel_name, int event_type)
2677 {
2678 int ret;
2679 struct ltt_kernel_channel *kchan;
2680
2681 switch (domain) {
2682 case LTTNG_DOMAIN_KERNEL:
2683 kchan = trace_kernel_get_channel_by_name(channel_name,
2684 session->kernel_session);
2685 if (kchan == NULL) {
2686 /* This call will notify the kernel thread */
2687 ret = channel_kernel_create(session->kernel_session, NULL,
2688 kernel_poll_pipe[1]);
2689 if (ret != LTTCOMM_OK) {
2690 goto error;
2691 }
2692
2693 /* Get the newly created kernel channel pointer */
2694 kchan = trace_kernel_get_channel_by_name(channel_name,
2695 session->kernel_session);
2696 if (kchan == NULL) {
2697 /* This sould not happen... */
2698 ret = LTTCOMM_FATAL;
2699 goto error;
2700 }
2701
2702 }
2703
2704 switch (event_type) {
2705 case LTTNG_EVENT_SYSCALL:
2706 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2707 kchan, kernel_tracer_fd);
2708 break;
2709 case LTTNG_EVENT_TRACEPOINT:
2710 /*
2711 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2712 * events already registered to the channel.
2713 */
2714 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2715 kchan, kernel_tracer_fd);
2716 break;
2717 case LTTNG_EVENT_ALL:
2718 /* Enable syscalls and tracepoints */
2719 ret = event_kernel_enable_all(session->kernel_session,
2720 kchan, kernel_tracer_fd);
2721 break;
2722 default:
2723 ret = LTTCOMM_KERN_ENABLE_FAIL;
2724 goto error;
2725 }
2726
2727 /* Manage return value */
2728 if (ret != LTTCOMM_OK) {
2729 goto error;
2730 }
2731
2732 kernel_wait_quiescent(kernel_tracer_fd);
2733 break;
2734 case LTTNG_DOMAIN_UST:
2735 {
2736 struct lttng_channel *attr;
2737 struct ltt_ust_channel *uchan;
2738 struct ltt_ust_session *usess = session->ust_session;
2739
2740 /* Get channel from global UST domain */
2741 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2742 channel_name);
2743 if (uchan == NULL) {
2744 /* Create default channel */
2745 attr = channel_new_default_attr(domain);
2746 if (attr == NULL) {
2747 ret = LTTCOMM_FATAL;
2748 goto error;
2749 }
2750 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2751 attr->name[NAME_MAX - 1] = '\0';
2752
2753 /* Use the internal command enable channel */
2754 ret = cmd_enable_channel(session, domain, attr);
2755 if (ret != LTTCOMM_OK) {
2756 free(attr);
2757 goto error;
2758 }
2759 free(attr);
2760
2761 /* Get the newly created channel reference back */
2762 uchan = trace_ust_find_channel_by_name(
2763 usess->domain_global.channels, channel_name);
2764 if (uchan == NULL) {
2765 /* Something is really wrong */
2766 ret = LTTCOMM_FATAL;
2767 goto error;
2768 }
2769 }
2770
2771 /* At this point, the session and channel exist on the tracer */
2772
2773 switch (event_type) {
2774 case LTTNG_EVENT_ALL:
2775 case LTTNG_EVENT_TRACEPOINT:
2776 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2777 if (ret != LTTCOMM_OK) {
2778 goto error;
2779 }
2780 break;
2781 default:
2782 ret = LTTCOMM_UST_ENABLE_FAIL;
2783 goto error;
2784 }
2785
2786 /* Manage return value */
2787 if (ret != LTTCOMM_OK) {
2788 goto error;
2789 }
2790
2791 break;
2792 }
2793 case LTTNG_DOMAIN_UST_EXEC_NAME:
2794 case LTTNG_DOMAIN_UST_PID:
2795 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2796 default:
2797 ret = LTTCOMM_NOT_IMPLEMENTED;
2798 goto error;
2799 }
2800
2801 ret = LTTCOMM_OK;
2802
2803 error:
2804 return ret;
2805 }
2806
2807 /*
2808 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2809 */
2810 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2811 {
2812 int ret;
2813 ssize_t nb_events = 0;
2814
2815 switch (domain) {
2816 case LTTNG_DOMAIN_KERNEL:
2817 nb_events = kernel_list_events(kernel_tracer_fd, events);
2818 if (nb_events < 0) {
2819 ret = LTTCOMM_KERN_LIST_FAIL;
2820 goto error;
2821 }
2822 break;
2823 case LTTNG_DOMAIN_UST:
2824 nb_events = ust_app_list_events(events);
2825 if (nb_events < 0) {
2826 ret = LTTCOMM_UST_LIST_FAIL;
2827 goto error;
2828 }
2829 break;
2830 default:
2831 ret = LTTCOMM_NOT_IMPLEMENTED;
2832 goto error;
2833 }
2834
2835 return nb_events;
2836
2837 error:
2838 /* Return negative value to differentiate return code */
2839 return -ret;
2840 }
2841
2842 /*
2843 * Command LTTNG_START_TRACE processed by the client thread.
2844 */
2845 static int cmd_start_trace(struct ltt_session *session)
2846 {
2847 int ret;
2848 struct ltt_kernel_session *ksession;
2849 struct ltt_ust_session *usess;
2850
2851 /* Short cut */
2852 ksession = session->kernel_session;
2853 usess = session->ust_session;
2854
2855 if (session->enabled)
2856 return LTTCOMM_UST_START_FAIL;
2857 session->enabled = 1;
2858
2859 /* Kernel tracing */
2860 if (ksession != NULL) {
2861 struct ltt_kernel_channel *kchan;
2862
2863 /* Open kernel metadata */
2864 if (ksession->metadata == NULL) {
2865 ret = kernel_open_metadata(ksession, ksession->trace_path);
2866 if (ret < 0) {
2867 ret = LTTCOMM_KERN_META_FAIL;
2868 goto error;
2869 }
2870 }
2871
2872 /* Open kernel metadata stream */
2873 if (ksession->metadata_stream_fd == 0) {
2874 ret = kernel_open_metadata_stream(ksession);
2875 if (ret < 0) {
2876 ERR("Kernel create metadata stream failed");
2877 ret = LTTCOMM_KERN_STREAM_FAIL;
2878 goto error;
2879 }
2880 }
2881
2882 /* For each channel */
2883 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2884 if (kchan->stream_count == 0) {
2885 ret = kernel_open_channel_stream(kchan);
2886 if (ret < 0) {
2887 ret = LTTCOMM_KERN_STREAM_FAIL;
2888 goto error;
2889 }
2890 /* Update the stream global counter */
2891 ksession->stream_count_global += ret;
2892 }
2893 }
2894
2895 /* Setup kernel consumer socket and send fds to it */
2896 ret = init_kernel_tracing(ksession);
2897 if (ret < 0) {
2898 ret = LTTCOMM_KERN_START_FAIL;
2899 goto error;
2900 }
2901
2902 /* This start the kernel tracing */
2903 ret = kernel_start_session(ksession);
2904 if (ret < 0) {
2905 ret = LTTCOMM_KERN_START_FAIL;
2906 goto error;
2907 }
2908
2909 /* Quiescent wait after starting trace */
2910 kernel_wait_quiescent(kernel_tracer_fd);
2911 }
2912
2913 /* Flag session that trace should start automatically */
2914 if (usess) {
2915 usess->start_trace = 1;
2916
2917 ret = ust_app_start_trace_all(usess);
2918 if (ret < 0) {
2919 ret = LTTCOMM_UST_START_FAIL;
2920 goto error;
2921 }
2922 }
2923
2924 ret = LTTCOMM_OK;
2925
2926 error:
2927 return ret;
2928 }
2929
2930 /*
2931 * Command LTTNG_STOP_TRACE processed by the client thread.
2932 */
2933 static int cmd_stop_trace(struct ltt_session *session)
2934 {
2935 int ret;
2936 struct ltt_kernel_channel *kchan;
2937 struct ltt_kernel_session *ksession;
2938 struct ltt_ust_session *usess;
2939
2940 /* Short cut */
2941 ksession = session->kernel_session;
2942 usess = session->ust_session;
2943
2944 if (!session->enabled)
2945 return LTTCOMM_UST_START_FAIL;
2946 session->enabled = 0;
2947
2948 /* Kernel tracer */
2949 if (ksession != NULL) {
2950 DBG("Stop kernel tracing");
2951
2952 /* Flush all buffers before stopping */
2953 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2954 if (ret < 0) {
2955 ERR("Kernel metadata flush failed");
2956 }
2957
2958 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2959 ret = kernel_flush_buffer(kchan);
2960 if (ret < 0) {
2961 ERR("Kernel flush buffer error");
2962 }
2963 }
2964
2965 ret = kernel_stop_session(ksession);
2966 if (ret < 0) {
2967 ret = LTTCOMM_KERN_STOP_FAIL;
2968 goto error;
2969 }
2970
2971 kernel_wait_quiescent(kernel_tracer_fd);
2972 }
2973
2974 if (usess) {
2975 usess->start_trace = 0;
2976
2977 ret = ust_app_stop_trace_all(usess);
2978 if (ret < 0) {
2979 ret = LTTCOMM_UST_START_FAIL;
2980 goto error;
2981 }
2982 }
2983
2984 ret = LTTCOMM_OK;
2985
2986 error:
2987 return ret;
2988 }
2989
2990 /*
2991 * Command LTTNG_CREATE_SESSION processed by the client thread.
2992 */
2993 static int cmd_create_session(char *name, char *path)
2994 {
2995 int ret;
2996
2997 ret = session_create(name, path);
2998 if (ret != LTTCOMM_OK) {
2999 goto error;
3000 }
3001
3002 ret = LTTCOMM_OK;
3003
3004 error:
3005 return ret;
3006 }
3007
3008 /*
3009 * Command LTTNG_DESTROY_SESSION processed by the client thread.
3010 */
3011 static int cmd_destroy_session(struct ltt_session *session, char *name)
3012 {
3013 int ret;
3014
3015 /* Clean kernel session teardown */
3016 teardown_kernel_session(session);
3017 /* UST session teardown */
3018 teardown_ust_session(session);
3019
3020 /*
3021 * Must notify the kernel thread here to update it's poll setin order
3022 * to remove the channel(s)' fd just destroyed.
3023 */
3024 ret = notify_thread_pipe(kernel_poll_pipe[1]);
3025 if (ret < 0) {
3026 perror("write kernel poll pipe");
3027 }
3028
3029 ret = session_destroy(session);
3030
3031 return ret;
3032 }
3033
3034 /*
3035 * Command LTTNG_CALIBRATE processed by the client thread.
3036 */
3037 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
3038 {
3039 int ret;
3040
3041 switch (domain) {
3042 case LTTNG_DOMAIN_KERNEL:
3043 {
3044 struct lttng_kernel_calibrate kcalibrate;
3045
3046 kcalibrate.type = calibrate->type;
3047 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
3048 if (ret < 0) {
3049 ret = LTTCOMM_KERN_ENABLE_FAIL;
3050 goto error;
3051 }
3052 break;
3053 }
3054 default:
3055 /* TODO: Userspace tracing */
3056 ret = LTTCOMM_NOT_IMPLEMENTED;
3057 goto error;
3058 }
3059
3060 ret = LTTCOMM_OK;
3061
3062 error:
3063 return ret;
3064 }
3065
3066 /*
3067 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
3068 */
3069 static int cmd_register_consumer(struct ltt_session *session, int domain,
3070 char *sock_path)
3071 {
3072 int ret, sock;
3073
3074 switch (domain) {
3075 case LTTNG_DOMAIN_KERNEL:
3076 /* Can't register a consumer if there is already one */
3077 if (session->kernel_session->consumer_fd != 0) {
3078 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3079 goto error;
3080 }
3081
3082 sock = lttcomm_connect_unix_sock(sock_path);
3083 if (sock < 0) {
3084 ret = LTTCOMM_CONNECT_FAIL;
3085 goto error;
3086 }
3087
3088 session->kernel_session->consumer_fd = sock;
3089 break;
3090 default:
3091 /* TODO: Userspace tracing */
3092 ret = LTTCOMM_NOT_IMPLEMENTED;
3093 goto error;
3094 }
3095
3096 ret = LTTCOMM_OK;
3097
3098 error:
3099 return ret;
3100 }
3101
3102 /*
3103 * Command LTTNG_LIST_DOMAINS processed by the client thread.
3104 */
3105 static ssize_t cmd_list_domains(struct ltt_session *session,
3106 struct lttng_domain **domains)
3107 {
3108 int ret, index = 0;
3109 ssize_t nb_dom = 0;
3110
3111 if (session->kernel_session != NULL) {
3112 DBG3("Listing domains found kernel domain");
3113 nb_dom++;
3114 }
3115
3116 if (session->ust_session != NULL) {
3117 DBG3("Listing domains found UST global domain");
3118 nb_dom++;
3119 }
3120
3121 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3122 if (*domains == NULL) {
3123 ret = -LTTCOMM_FATAL;
3124 goto error;
3125 }
3126
3127 if (session->kernel_session != NULL) {
3128 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3129 index++;
3130 }
3131
3132 if (session->ust_session != NULL) {
3133 (*domains)[index].type = LTTNG_DOMAIN_UST;
3134 index++;
3135 }
3136
3137 return nb_dom;
3138
3139 error:
3140 return ret;
3141 }
3142
3143 /*
3144 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3145 */
3146 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3147 struct lttng_channel **channels)
3148 {
3149 int ret;
3150 ssize_t nb_chan = 0;
3151
3152 switch (domain) {
3153 case LTTNG_DOMAIN_KERNEL:
3154 if (session->kernel_session != NULL) {
3155 nb_chan = session->kernel_session->channel_count;
3156 }
3157 DBG3("Number of kernel channels %zd", nb_chan);
3158 break;
3159 case LTTNG_DOMAIN_UST:
3160 if (session->ust_session != NULL) {
3161 nb_chan = hashtable_get_count(
3162 session->ust_session->domain_global.channels);
3163 }
3164 DBG3("Number of UST global channels %zd", nb_chan);
3165 break;
3166 default:
3167 *channels = NULL;
3168 ret = -LTTCOMM_NOT_IMPLEMENTED;
3169 goto error;
3170 }
3171
3172 if (nb_chan > 0) {
3173 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3174 if (*channels == NULL) {
3175 ret = -LTTCOMM_FATAL;
3176 goto error;
3177 }
3178
3179 list_lttng_channels(domain, session, *channels);
3180 } else {
3181 *channels = NULL;
3182 }
3183
3184 return nb_chan;
3185
3186 error:
3187 return ret;
3188 }
3189
3190 /*
3191 * Command LTTNG_LIST_EVENTS processed by the client thread.
3192 */
3193 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3194 char *channel_name, struct lttng_event **events)
3195 {
3196 int ret = 0;
3197 ssize_t nb_event = 0;
3198
3199 switch (domain) {
3200 case LTTNG_DOMAIN_KERNEL:
3201 if (session->kernel_session != NULL) {
3202 nb_event = list_lttng_kernel_events(channel_name,
3203 session->kernel_session, events);
3204 }
3205 break;
3206 case LTTNG_DOMAIN_UST:
3207 {
3208 if (session->ust_session != NULL) {
3209 nb_event = list_lttng_ust_global_events(channel_name,
3210 &session->ust_session->domain_global, events);
3211 }
3212 break;
3213 }
3214 default:
3215 ret = -LTTCOMM_NOT_IMPLEMENTED;
3216 goto error;
3217 }
3218
3219 ret = nb_event;
3220
3221 error:
3222 return ret;
3223 }
3224
3225 /*
3226 * Process the command requested by the lttng client within the command
3227 * context structure. This function make sure that the return structure (llm)
3228 * is set and ready for transmission before returning.
3229 *
3230 * Return any error encountered or 0 for success.
3231 */
3232 static int process_client_msg(struct command_ctx *cmd_ctx)
3233 {
3234 int ret = LTTCOMM_OK;
3235 int need_tracing_session = 1;
3236
3237 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3238
3239 /*
3240 * Check for command that don't needs to allocate a returned payload. We do
3241 * this here so we don't have to make the call for no payload at each
3242 * command.
3243 */
3244 switch(cmd_ctx->lsm->cmd_type) {
3245 case LTTNG_LIST_SESSIONS:
3246 case LTTNG_LIST_TRACEPOINTS:
3247 case LTTNG_LIST_DOMAINS:
3248 case LTTNG_LIST_CHANNELS:
3249 case LTTNG_LIST_EVENTS:
3250 break;
3251 default:
3252 /* Setup lttng message with no payload */
3253 ret = setup_lttng_msg(cmd_ctx, 0);
3254 if (ret < 0) {
3255 /* This label does not try to unlock the session */
3256 goto init_setup_error;
3257 }
3258 }
3259
3260 /* Commands that DO NOT need a session. */
3261 switch (cmd_ctx->lsm->cmd_type) {
3262 case LTTNG_CALIBRATE:
3263 case LTTNG_CREATE_SESSION:
3264 case LTTNG_LIST_SESSIONS:
3265 case LTTNG_LIST_TRACEPOINTS:
3266 need_tracing_session = 0;
3267 break;
3268 default:
3269 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3270 session_lock_list();
3271 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3272 session_unlock_list();
3273 if (cmd_ctx->session == NULL) {
3274 if (cmd_ctx->lsm->session.name != NULL) {
3275 ret = LTTCOMM_SESS_NOT_FOUND;
3276 } else {
3277 /* If no session name specified */
3278 ret = LTTCOMM_SELECT_SESS;
3279 }
3280 goto error;
3281 } else {
3282 /* Acquire lock for the session */
3283 session_lock(cmd_ctx->session);
3284 }
3285 break;
3286 }
3287
3288 /*
3289 * Check domain type for specific "pre-action".
3290 */
3291 switch (cmd_ctx->lsm->domain.type) {
3292 case LTTNG_DOMAIN_KERNEL:
3293 /* Kernel tracer check */
3294 if (kernel_tracer_fd == 0) {
3295 /* Basically, load kernel tracer modules */
3296 init_kernel_tracer();
3297 if (kernel_tracer_fd == 0) {
3298 ret = LTTCOMM_KERN_NA;
3299 goto error;
3300 }
3301 }
3302
3303 /* Need a session for kernel command */
3304 if (need_tracing_session) {
3305 if (cmd_ctx->session->kernel_session == NULL) {
3306 ret = create_kernel_session(cmd_ctx->session);
3307 if (ret < 0) {
3308 ret = LTTCOMM_KERN_SESS_FAIL;
3309 goto error;
3310 }
3311 }
3312
3313 /* Start the kernel consumer daemon */
3314 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3315 if (kconsumer_data.pid == 0 &&
3316 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3317 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3318 ret = start_consumerd(&kconsumer_data);
3319 if (ret < 0) {
3320 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3321 goto error;
3322 }
3323 } else {
3324 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3325 }
3326 }
3327 break;
3328 case LTTNG_DOMAIN_UST:
3329 {
3330 if (need_tracing_session) {
3331 if (cmd_ctx->session->ust_session == NULL) {
3332 ret = create_ust_session(cmd_ctx->session,
3333 &cmd_ctx->lsm->domain);
3334 if (ret != LTTCOMM_OK) {
3335 goto error;
3336 }
3337 }
3338 /* Start the UST consumer daemons */
3339 /* 64-bit */
3340 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3341 if (consumerd64_bin[0] != '\0' &&
3342 ustconsumer64_data.pid == 0 &&
3343 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3344 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3345 ret = start_consumerd(&ustconsumer64_data);
3346 if (ret < 0) {
3347 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3348 ust_consumerd64_fd = -EINVAL;
3349 goto error;
3350 }
3351
3352 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3353 } else {
3354 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3355 }
3356 /* 32-bit */
3357 if (consumerd32_bin[0] != '\0' &&
3358 ustconsumer32_data.pid == 0 &&
3359 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3360 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3361 ret = start_consumerd(&ustconsumer32_data);
3362 if (ret < 0) {
3363 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3364 ust_consumerd32_fd = -EINVAL;
3365 goto error;
3366 }
3367 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3368 } else {
3369 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3370 }
3371 }
3372 break;
3373 }
3374 default:
3375 break;
3376 }
3377
3378 /* Process by command type */
3379 switch (cmd_ctx->lsm->cmd_type) {
3380 case LTTNG_ADD_CONTEXT:
3381 {
3382 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3383 cmd_ctx->lsm->u.context.channel_name,
3384 cmd_ctx->lsm->u.context.event_name,
3385 &cmd_ctx->lsm->u.context.ctx);
3386 break;
3387 }
3388 case LTTNG_DISABLE_CHANNEL:
3389 {
3390 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3391 cmd_ctx->lsm->u.disable.channel_name);
3392 break;
3393 }
3394 case LTTNG_DISABLE_EVENT:
3395 {
3396 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3397 cmd_ctx->lsm->u.disable.channel_name,
3398 cmd_ctx->lsm->u.disable.name);
3399 ret = LTTCOMM_OK;
3400 break;
3401 }
3402 case LTTNG_DISABLE_ALL_EVENT:
3403 {
3404 DBG("Disabling all events");
3405
3406 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3407 cmd_ctx->lsm->u.disable.channel_name);
3408 break;
3409 }
3410 case LTTNG_ENABLE_CHANNEL:
3411 {
3412 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3413 &cmd_ctx->lsm->u.channel.chan);
3414 break;
3415 }
3416 case LTTNG_ENABLE_EVENT:
3417 {
3418 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3419 cmd_ctx->lsm->u.enable.channel_name,
3420 &cmd_ctx->lsm->u.enable.event);
3421 break;
3422 }
3423 case LTTNG_ENABLE_ALL_EVENT:
3424 {
3425 DBG("Enabling all events");
3426
3427 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3428 cmd_ctx->lsm->u.enable.channel_name,
3429 cmd_ctx->lsm->u.enable.event.type);
3430 break;
3431 }
3432 case LTTNG_LIST_TRACEPOINTS:
3433 {
3434 struct lttng_event *events;
3435 ssize_t nb_events;
3436
3437 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3438 if (nb_events < 0) {
3439 ret = -nb_events;
3440 goto error;
3441 }
3442
3443 /*
3444 * Setup lttng message with payload size set to the event list size in
3445 * bytes and then copy list into the llm payload.
3446 */
3447 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3448 if (ret < 0) {
3449 free(events);
3450 goto setup_error;
3451 }
3452
3453 /* Copy event list into message payload */
3454 memcpy(cmd_ctx->llm->payload, events,
3455 sizeof(struct lttng_event) * nb_events);
3456
3457 free(events);
3458
3459 ret = LTTCOMM_OK;
3460 break;
3461 }
3462 case LTTNG_START_TRACE:
3463 {
3464 ret = cmd_start_trace(cmd_ctx->session);
3465 break;
3466 }
3467 case LTTNG_STOP_TRACE:
3468 {
3469 ret = cmd_stop_trace(cmd_ctx->session);
3470 break;
3471 }
3472 case LTTNG_CREATE_SESSION:
3473 {
3474 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3475 cmd_ctx->lsm->session.path);
3476 break;
3477 }
3478 case LTTNG_DESTROY_SESSION:
3479 {
3480 ret = cmd_destroy_session(cmd_ctx->session,
3481 cmd_ctx->lsm->session.name);
3482 break;
3483 }
3484 case LTTNG_LIST_DOMAINS:
3485 {
3486 ssize_t nb_dom;
3487 struct lttng_domain *domains;
3488
3489 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3490 if (nb_dom < 0) {
3491 ret = -nb_dom;
3492 goto error;
3493 }
3494
3495 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3496 if (ret < 0) {
3497 goto setup_error;
3498 }
3499
3500 /* Copy event list into message payload */
3501 memcpy(cmd_ctx->llm->payload, domains,
3502 nb_dom * sizeof(struct lttng_domain));
3503
3504 free(domains);
3505
3506 ret = LTTCOMM_OK;
3507 break;
3508 }
3509 case LTTNG_LIST_CHANNELS:
3510 {
3511 size_t nb_chan;
3512 struct lttng_channel *channels;
3513
3514 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3515 cmd_ctx->session, &channels);
3516 if (nb_chan < 0) {
3517 ret = -nb_chan;
3518 goto error;
3519 }
3520
3521 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3522 if (ret < 0) {
3523 goto setup_error;
3524 }
3525
3526 /* Copy event list into message payload */
3527 memcpy(cmd_ctx->llm->payload, channels,
3528 nb_chan * sizeof(struct lttng_channel));
3529
3530 free(channels);
3531
3532 ret = LTTCOMM_OK;
3533 break;
3534 }
3535 case LTTNG_LIST_EVENTS:
3536 {
3537 ssize_t nb_event;
3538 struct lttng_event *events = NULL;
3539
3540 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3541 cmd_ctx->lsm->u.list.channel_name, &events);
3542 if (nb_event < 0) {
3543 ret = -nb_event;
3544 goto error;
3545 }
3546
3547 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3548 if (ret < 0) {
3549 goto setup_error;
3550 }
3551
3552 /* Copy event list into message payload */
3553 memcpy(cmd_ctx->llm->payload, events,
3554 nb_event * sizeof(struct lttng_event));
3555
3556 free(events);
3557
3558 ret = LTTCOMM_OK;
3559 break;
3560 }
3561 case LTTNG_LIST_SESSIONS:
3562 {
3563 session_lock_list();
3564
3565 if (session_list_ptr->count == 0) {
3566 ret = LTTCOMM_NO_SESSION;
3567 session_unlock_list();
3568 goto error;
3569 }
3570
3571 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) *
3572 session_list_ptr->count);
3573 if (ret < 0) {
3574 session_unlock_list();
3575 goto setup_error;
3576 }
3577
3578 /* Filled the session array */
3579 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload));
3580
3581 session_unlock_list();
3582
3583 ret = LTTCOMM_OK;
3584 break;
3585 }
3586 case LTTNG_CALIBRATE:
3587 {
3588 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3589 &cmd_ctx->lsm->u.calibrate);
3590 break;
3591 }
3592 case LTTNG_REGISTER_CONSUMER:
3593 {
3594 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3595 cmd_ctx->lsm->u.reg.path);
3596 break;
3597 }
3598 default:
3599 ret = LTTCOMM_UND;
3600 break;
3601 }
3602
3603 error:
3604 if (cmd_ctx->llm == NULL) {
3605 DBG("Missing llm structure. Allocating one.");
3606 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3607 goto setup_error;
3608 }
3609 }
3610 /* Set return code */
3611 cmd_ctx->llm->ret_code = ret;
3612 setup_error:
3613 if (cmd_ctx->session) {
3614 session_unlock(cmd_ctx->session);
3615 }
3616 init_setup_error:
3617 return ret;
3618 }
3619
3620 /*
3621 * This thread manage all clients request using the unix client socket for
3622 * communication.
3623 */
3624 static void *thread_manage_clients(void *data)
3625 {
3626 int sock = 0, ret, i, pollfd;
3627 uint32_t revents, nb_fd;
3628 struct command_ctx *cmd_ctx = NULL;
3629 struct lttng_poll_event events;
3630
3631 DBG("[thread] Manage client started");
3632
3633 rcu_register_thread();
3634
3635 ret = lttcomm_listen_unix_sock(client_sock);
3636 if (ret < 0) {
3637 goto error;
3638 }
3639
3640 /*
3641 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3642 * more will be added to this poll set.
3643 */
3644 ret = create_thread_poll_set(&events, 2);
3645 if (ret < 0) {
3646 goto error;
3647 }
3648
3649 /* Add the application registration socket */
3650 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3651 if (ret < 0) {
3652 goto error;
3653 }
3654
3655 /*
3656 * Notify parent pid that we are ready to accept command for client side.
3657 */
3658 if (opt_sig_parent) {
3659 kill(ppid, SIGCHLD);
3660 }
3661
3662 while (1) {
3663 DBG("Accepting client command ...");
3664
3665 nb_fd = LTTNG_POLL_GETNB(&events);
3666
3667 /* Inifinite blocking call, waiting for transmission */
3668 ret = lttng_poll_wait(&events, -1);
3669 if (ret < 0) {
3670 goto error;
3671 }
3672
3673 for (i = 0; i < nb_fd; i++) {
3674 /* Fetch once the poll data */
3675 revents = LTTNG_POLL_GETEV(&events, i);
3676 pollfd = LTTNG_POLL_GETFD(&events, i);
3677
3678 /* Thread quit pipe has been closed. Killing thread. */
3679 ret = check_thread_quit_pipe(pollfd, revents);
3680 if (ret) {
3681 goto error;
3682 }
3683
3684 /* Event on the registration socket */
3685 if (pollfd == client_sock) {
3686 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3687 ERR("Client socket poll error");
3688 goto error;
3689 }
3690 }
3691 }
3692
3693 DBG("Wait for client response");
3694
3695 sock = lttcomm_accept_unix_sock(client_sock);
3696 if (sock < 0) {
3697 goto error;
3698 }
3699
3700 /* Allocate context command to process the client request */
3701 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3702 if (cmd_ctx == NULL) {
3703 perror("zmalloc cmd_ctx");
3704 goto error;
3705 }
3706
3707 /* Allocate data buffer for reception */
3708 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3709 if (cmd_ctx->lsm == NULL) {
3710 perror("zmalloc cmd_ctx->lsm");
3711 goto error;
3712 }
3713
3714 cmd_ctx->llm = NULL;
3715 cmd_ctx->session = NULL;
3716
3717 /*
3718 * Data is received from the lttng client. The struct
3719 * lttcomm_session_msg (lsm) contains the command and data request of
3720 * the client.
3721 */
3722 DBG("Receiving data from client ...");
3723 ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm,
3724 sizeof(struct lttcomm_session_msg));
3725 if (ret <= 0) {
3726 DBG("Nothing recv() from client... continuing");
3727 close(sock);
3728 free(cmd_ctx);
3729 continue;
3730 }
3731
3732 // TODO: Validate cmd_ctx including sanity check for
3733 // security purpose.
3734
3735 rcu_thread_online();
3736 /*
3737 * This function dispatch the work to the kernel or userspace tracer
3738 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3739 * informations for the client. The command context struct contains
3740 * everything this function may needs.
3741 */
3742 ret = process_client_msg(cmd_ctx);
3743 rcu_thread_offline();
3744 if (ret < 0) {
3745 /*
3746 * TODO: Inform client somehow of the fatal error. At
3747 * this point, ret < 0 means that a zmalloc failed
3748 * (ENOMEM). Error detected but still accept command.
3749 */
3750 clean_command_ctx(&cmd_ctx);
3751 continue;
3752 }
3753
3754 DBG("Sending response (size: %d, retcode: %s)",
3755 cmd_ctx->lttng_msg_size,
3756 lttng_strerror(-cmd_ctx->llm->ret_code));
3757 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3758 if (ret < 0) {
3759 ERR("Failed to send data back to client");
3760 }
3761
3762 clean_command_ctx(&cmd_ctx);
3763
3764 /* End of transmission */
3765 close(sock);
3766 }
3767
3768 error:
3769 DBG("Client thread dying");
3770 unlink(client_unix_sock_path);
3771 close(client_sock);
3772 close(sock);
3773
3774 lttng_poll_clean(&events);
3775 clean_command_ctx(&cmd_ctx);
3776
3777 rcu_unregister_thread();
3778 return NULL;
3779 }
3780
3781
3782 /*
3783 * usage function on stderr
3784 */
3785 static void usage(void)
3786 {
3787 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3788 fprintf(stderr, " -h, --help Display this usage.\n");
3789 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3790 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3791 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3792 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3793 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3794 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3795 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3796 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3797 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3798 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3799 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3800 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3801 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3802 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3803 fprintf(stderr, " -V, --version Show version number.\n");
3804 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3805 fprintf(stderr, " -q, --quiet No output at all.\n");
3806 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3807 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3808 }
3809
3810 /*
3811 * daemon argument parsing
3812 */
3813 static int parse_args(int argc, char **argv)
3814 {
3815 int c;
3816
3817 static struct option long_options[] = {
3818 { "client-sock", 1, 0, 'c' },
3819 { "apps-sock", 1, 0, 'a' },
3820 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3821 { "kconsumerd-err-sock", 1, 0, 'E' },
3822 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3823 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3824 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3825 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3826 { "consumerd32-path", 1, 0, 'u' },
3827 { "consumerd32-libdir", 1, 0, 'U' },
3828 { "consumerd64-path", 1, 0, 't' },
3829 { "consumerd64-libdir", 1, 0, 'T' },
3830 { "daemonize", 0, 0, 'd' },
3831 { "sig-parent", 0, 0, 'S' },
3832 { "help", 0, 0, 'h' },
3833 { "group", 1, 0, 'g' },
3834 { "version", 0, 0, 'V' },
3835 { "quiet", 0, 0, 'q' },
3836 { "verbose", 0, 0, 'v' },
3837 { "verbose-consumer", 0, 0, 'Z' },
3838 { NULL, 0, 0, 0 }
3839 };
3840
3841 while (1) {
3842 int option_index = 0;
3843 c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t",
3844 long_options, &option_index);
3845 if (c == -1) {
3846 break;
3847 }
3848
3849 switch (c) {
3850 case 0:
3851 fprintf(stderr, "option %s", long_options[option_index].name);
3852 if (optarg) {
3853 fprintf(stderr, " with arg %s\n", optarg);
3854 }
3855 break;
3856 case 'c':
3857 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3858 break;
3859 case 'a':
3860 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3861 break;
3862 case 'd':
3863 opt_daemon = 1;
3864 break;
3865 case 'g':
3866 opt_tracing_group = optarg;
3867 break;
3868 case 'h':
3869 usage();
3870 exit(EXIT_FAILURE);
3871 case 'V':
3872 fprintf(stdout, "%s\n", VERSION);
3873 exit(EXIT_SUCCESS);
3874 case 'S':
3875 opt_sig_parent = 1;
3876 break;
3877 case 'E':
3878 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3879 break;
3880 case 'C':
3881 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3882 break;
3883 case 'F':
3884 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3885 break;
3886 case 'D':
3887 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3888 break;
3889 case 'H':
3890 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3891 break;
3892 case 'G':
3893 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3894 break;
3895 case 'q':
3896 opt_quiet = 1;
3897 break;
3898 case 'v':
3899 /* Verbose level can increase using multiple -v */
3900 opt_verbose += 1;
3901 break;
3902 case 'Z':
3903 opt_verbose_consumer += 1;
3904 break;
3905 case 'u':
3906 consumerd32_bin= optarg;
3907 break;
3908 case 'U':
3909 consumerd32_libdir = optarg;
3910 break;
3911 case 't':
3912 consumerd64_bin = optarg;
3913 break;
3914 case 'T':
3915 consumerd64_libdir = optarg;
3916 break;
3917 default:
3918 /* Unknown option or other error.
3919 * Error is printed by getopt, just return */
3920 return -1;
3921 }
3922 }
3923
3924 return 0;
3925 }
3926
3927 /*
3928 * Creates the two needed socket by the daemon.
3929 * apps_sock - The communication socket for all UST apps.
3930 * client_sock - The communication of the cli tool (lttng).
3931 */
3932 static int init_daemon_socket(void)
3933 {
3934 int ret = 0;
3935 mode_t old_umask;
3936
3937 old_umask = umask(0);
3938
3939 /* Create client tool unix socket */
3940 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3941 if (client_sock < 0) {
3942 ERR("Create unix sock failed: %s", client_unix_sock_path);
3943 ret = -1;
3944 goto end;
3945 }
3946
3947 /* File permission MUST be 660 */
3948 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3949 if (ret < 0) {
3950 ERR("Set file permissions failed: %s", client_unix_sock_path);
3951 perror("chmod");
3952 goto end;
3953 }
3954
3955 /* Create the application unix socket */
3956 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3957 if (apps_sock < 0) {
3958 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3959 ret = -1;
3960 goto end;
3961 }
3962
3963 /* File permission MUST be 666 */
3964 ret = chmod(apps_unix_sock_path,
3965 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3966 if (ret < 0) {
3967 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3968 perror("chmod");
3969 goto end;
3970 }
3971
3972 end:
3973 umask(old_umask);
3974 return ret;
3975 }
3976
3977 /*
3978 * Check if the global socket is available, and if a daemon is answering at the
3979 * other side. If yes, error is returned.
3980 */
3981 static int check_existing_daemon(void)
3982 {
3983 if (access(client_unix_sock_path, F_OK) < 0 &&
3984 access(apps_unix_sock_path, F_OK) < 0) {
3985 return 0;
3986 }
3987
3988 /* Is there anybody out there ? */
3989 if (lttng_session_daemon_alive()) {
3990 return -EEXIST;
3991 } else {
3992 return 0;
3993 }
3994 }
3995
3996 /*
3997 * Set the tracing group gid onto the client socket.
3998 *
3999 * Race window between mkdir and chown is OK because we are going from more
4000 * permissive (root.root) to les permissive (root.tracing).
4001 */
4002 static int set_permissions(void)
4003 {
4004 int ret;
4005 gid_t gid;
4006
4007 gid = allowed_group();
4008 if (gid < 0) {
4009 if (is_root) {
4010 WARN("No tracing group detected");
4011 ret = 0;
4012 } else {
4013 ERR("Missing tracing group. Aborting execution.");
4014 ret = -1;
4015 }
4016 goto end;
4017 }
4018
4019 /* Set lttng run dir */
4020 ret = chown(LTTNG_RUNDIR, 0, gid);
4021 if (ret < 0) {
4022 ERR("Unable to set group on " LTTNG_RUNDIR);
4023 perror("chown");
4024 }
4025
4026 /* lttng client socket path */
4027 ret = chown(client_unix_sock_path, 0, gid);
4028 if (ret < 0) {
4029 ERR("Unable to set group on %s", client_unix_sock_path);
4030 perror("chown");
4031 }
4032
4033 /* kconsumer error socket path */
4034 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
4035 if (ret < 0) {
4036 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
4037 perror("chown");
4038 }
4039
4040 /* 64-bit ustconsumer error socket path */
4041 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
4042 if (ret < 0) {
4043 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
4044 perror("chown");
4045 }
4046
4047 /* 32-bit ustconsumer compat32 error socket path */
4048 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
4049 if (ret < 0) {
4050 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
4051 perror("chown");
4052 }
4053
4054 DBG("All permissions are set");
4055
4056 end:
4057 return ret;
4058 }
4059
4060 /*
4061 * Create the pipe used to wake up the kernel thread.
4062 */
4063 static int create_kernel_poll_pipe(void)
4064 {
4065 return pipe2(kernel_poll_pipe, O_CLOEXEC);
4066 }
4067
4068 /*
4069 * Create the application command pipe to wake thread_manage_apps.
4070 */
4071 static int create_apps_cmd_pipe(void)
4072 {
4073 return pipe2(apps_cmd_pipe, O_CLOEXEC);
4074 }
4075
4076 /*
4077 * Create the lttng run directory needed for all global sockets and pipe.
4078 */
4079 static int create_lttng_rundir(void)
4080 {
4081 int ret;
4082
4083 ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG );
4084 if (ret < 0) {
4085 if (errno != EEXIST) {
4086 ERR("Unable to create " LTTNG_RUNDIR);
4087 goto error;
4088 } else {
4089 ret = 0;
4090 }
4091 }
4092
4093 error:
4094 return ret;
4095 }
4096
4097 /*
4098 * Setup sockets and directory needed by the kconsumerd communication with the
4099 * session daemon.
4100 */
4101 static int set_consumer_sockets(struct consumer_data *consumer_data)
4102 {
4103 int ret;
4104 const char *path;
4105
4106 switch (consumer_data->type) {
4107 case LTTNG_CONSUMER_KERNEL:
4108 path = KCONSUMERD_PATH;
4109 break;
4110 case LTTNG_CONSUMER64_UST:
4111 path = USTCONSUMERD64_PATH;
4112 break;
4113 case LTTNG_CONSUMER32_UST:
4114 path = USTCONSUMERD32_PATH;
4115 break;
4116 default:
4117 ERR("Consumer type unknown");
4118 ret = -EINVAL;
4119 goto error;
4120 }
4121
4122 ret = mkdir(path, S_IRWXU | S_IRWXG);
4123 if (ret < 0) {
4124 if (errno != EEXIST) {
4125 ERR("Failed to create %s", path);
4126 goto error;
4127 }
4128 ret = 0;
4129 }
4130
4131 /* Create the kconsumerd error unix socket */
4132 consumer_data->err_sock =
4133 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4134 if (consumer_data->err_sock < 0) {
4135 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4136 ret = -1;
4137 goto error;
4138 }
4139
4140 /* File permission MUST be 660 */
4141 ret = chmod(consumer_data->err_unix_sock_path,
4142 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4143 if (ret < 0) {
4144 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4145 perror("chmod");
4146 goto error;
4147 }
4148
4149 error:
4150 return ret;
4151 }
4152
4153 /*
4154 * Signal handler for the daemon
4155 *
4156 * Simply stop all worker threads, leaving main() return gracefully after
4157 * joining all threads and calling cleanup().
4158 */
4159 static void sighandler(int sig)
4160 {
4161 switch (sig) {
4162 case SIGPIPE:
4163 DBG("SIGPIPE catched");
4164 return;
4165 case SIGINT:
4166 DBG("SIGINT catched");
4167 stop_threads();
4168 break;
4169 case SIGTERM:
4170 DBG("SIGTERM catched");
4171 stop_threads();
4172 break;
4173 default:
4174 break;
4175 }
4176 }
4177
4178 /*
4179 * Setup signal handler for :
4180 * SIGINT, SIGTERM, SIGPIPE
4181 */
4182 static int set_signal_handler(void)
4183 {
4184 int ret = 0;
4185 struct sigaction sa;
4186 sigset_t sigset;
4187
4188 if ((ret = sigemptyset(&sigset)) < 0) {
4189 perror("sigemptyset");
4190 return ret;
4191 }
4192
4193 sa.sa_handler = sighandler;
4194 sa.sa_mask = sigset;
4195 sa.sa_flags = 0;
4196 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4197 perror("sigaction");
4198 return ret;
4199 }
4200
4201 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4202 perror("sigaction");
4203 return ret;
4204 }
4205
4206 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4207 perror("sigaction");
4208 return ret;
4209 }
4210
4211 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4212
4213 return ret;
4214 }
4215
4216 /*
4217 * Set open files limit to unlimited. This daemon can open a large number of
4218 * file descriptors in order to consumer multiple kernel traces.
4219 */
4220 static void set_ulimit(void)
4221 {
4222 int ret;
4223 struct rlimit lim;
4224
4225 /* The kernel does not allowed an infinite limit for open files */
4226 lim.rlim_cur = 65535;
4227 lim.rlim_max = 65535;
4228
4229 ret = setrlimit(RLIMIT_NOFILE, &lim);
4230 if (ret < 0) {
4231 perror("failed to set open files limit");
4232 }
4233 }
4234
4235 /*
4236 * main
4237 */
4238 int main(int argc, char **argv)
4239 {
4240 int ret = 0;
4241 void *status;
4242 const char *home_path;
4243
4244 rcu_register_thread();
4245
4246 /* Create thread quit pipe */
4247 if ((ret = init_thread_quit_pipe()) < 0) {
4248 goto error;
4249 }
4250
4251 setup_consumerd_path();
4252
4253 /* Parse arguments */
4254 progname = argv[0];
4255 if ((ret = parse_args(argc, argv) < 0)) {
4256 goto error;
4257 }
4258
4259 /* Daemonize */
4260 if (opt_daemon) {
4261 ret = daemon(0, 0);
4262 if (ret < 0) {
4263 perror("daemon");
4264 goto error;
4265 }
4266 }
4267
4268 /* Check if daemon is UID = 0 */
4269 is_root = !getuid();
4270
4271 if (is_root) {
4272 ret = create_lttng_rundir();
4273 if (ret < 0) {
4274 goto error;
4275 }
4276
4277 if (strlen(apps_unix_sock_path) == 0) {
4278 snprintf(apps_unix_sock_path, PATH_MAX,
4279 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4280 }
4281
4282 if (strlen(client_unix_sock_path) == 0) {
4283 snprintf(client_unix_sock_path, PATH_MAX,
4284 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4285 }
4286
4287 /* Set global SHM for ust */
4288 if (strlen(wait_shm_path) == 0) {
4289 snprintf(wait_shm_path, PATH_MAX,
4290 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4291 }
4292 } else {
4293 home_path = get_home_dir();
4294 if (home_path == NULL) {
4295 /* TODO: Add --socket PATH option */
4296 ERR("Can't get HOME directory for sockets creation.");
4297 ret = -EPERM;
4298 goto error;
4299 }
4300
4301 if (strlen(apps_unix_sock_path) == 0) {
4302 snprintf(apps_unix_sock_path, PATH_MAX,
4303 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4304 }
4305
4306 /* Set the cli tool unix socket path */
4307 if (strlen(client_unix_sock_path) == 0) {
4308 snprintf(client_unix_sock_path, PATH_MAX,
4309 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4310 }
4311
4312 /* Set global SHM for ust */
4313 if (strlen(wait_shm_path) == 0) {
4314 snprintf(wait_shm_path, PATH_MAX,
4315 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4316 }
4317 }
4318
4319 DBG("Client socket path %s", client_unix_sock_path);
4320 DBG("Application socket path %s", apps_unix_sock_path);
4321
4322 /*
4323 * See if daemon already exist.
4324 */
4325 if ((ret = check_existing_daemon()) < 0) {
4326 ERR("Already running daemon.\n");
4327 /*
4328 * We do not goto exit because we must not cleanup()
4329 * because a daemon is already running.
4330 */
4331 goto error;
4332 }
4333
4334 /* After this point, we can safely call cleanup() with "goto exit" */
4335
4336 /*
4337 * These actions must be executed as root. We do that *after* setting up
4338 * the sockets path because we MUST make the check for another daemon using
4339 * those paths *before* trying to set the kernel consumer sockets and init
4340 * kernel tracer.
4341 */
4342 if (is_root) {
4343 ret = set_consumer_sockets(&kconsumer_data);
4344 if (ret < 0) {
4345 goto exit;
4346 }
4347
4348 ret = set_consumer_sockets(&ustconsumer64_data);
4349 if (ret < 0) {
4350 goto exit;
4351 }
4352
4353 ret = set_consumer_sockets(&ustconsumer32_data);
4354 if (ret < 0) {
4355 goto exit;
4356 }
4357
4358 /* Setup kernel tracer */
4359 init_kernel_tracer();
4360
4361 /* Set ulimit for open files */
4362 set_ulimit();
4363 }
4364
4365 if ((ret = set_signal_handler()) < 0) {
4366 goto exit;
4367 }
4368
4369 /* Setup the needed unix socket */
4370 if ((ret = init_daemon_socket()) < 0) {
4371 goto exit;
4372 }
4373
4374 /* Set credentials to socket */
4375 if (is_root && ((ret = set_permissions()) < 0)) {
4376 goto exit;
4377 }
4378
4379 /* Get parent pid if -S, --sig-parent is specified. */
4380 if (opt_sig_parent) {
4381 ppid = getppid();
4382 }
4383
4384 /* Setup the kernel pipe for waking up the kernel thread */
4385 if ((ret = create_kernel_poll_pipe()) < 0) {
4386 goto exit;
4387 }
4388
4389 /* Setup the thread apps communication pipe. */
4390 if ((ret = create_apps_cmd_pipe()) < 0) {
4391 goto exit;
4392 }
4393
4394 /* Init UST command queue. */
4395 cds_wfq_init(&ust_cmd_queue.queue);
4396
4397 /* Init UST app hash table */
4398 ust_app_ht_alloc();
4399
4400 /*
4401 * Get session list pointer. This pointer MUST NOT be free(). This list is
4402 * statically declared in session.c
4403 */
4404 session_list_ptr = session_get_list();
4405
4406 /* Set up max poll set size */
4407 lttng_poll_set_max_size();
4408
4409 /* Create thread to manage the client socket */
4410 ret = pthread_create(&client_thread, NULL,
4411 thread_manage_clients, (void *) NULL);
4412 if (ret != 0) {
4413 perror("pthread_create clients");
4414 goto exit_client;
4415 }
4416
4417 /* Create thread to dispatch registration */
4418 ret = pthread_create(&dispatch_thread, NULL,
4419 thread_dispatch_ust_registration, (void *) NULL);
4420 if (ret != 0) {
4421 perror("pthread_create dispatch");
4422 goto exit_dispatch;
4423 }
4424
4425 /* Create thread to manage application registration. */
4426 ret = pthread_create(&reg_apps_thread, NULL,
4427 thread_registration_apps, (void *) NULL);
4428 if (ret != 0) {
4429 perror("pthread_create registration");
4430 goto exit_reg_apps;
4431 }
4432
4433 /* Create thread to manage application socket */
4434 ret = pthread_create(&apps_thread, NULL,
4435 thread_manage_apps, (void *) NULL);
4436 if (ret != 0) {
4437 perror("pthread_create apps");
4438 goto exit_apps;
4439 }
4440
4441 /* Create kernel thread to manage kernel event */
4442 ret = pthread_create(&kernel_thread, NULL,
4443 thread_manage_kernel, (void *) NULL);
4444 if (ret != 0) {
4445 perror("pthread_create kernel");
4446 goto exit_kernel;
4447 }
4448
4449 ret = pthread_join(kernel_thread, &status);
4450 if (ret != 0) {
4451 perror("pthread_join");
4452 goto error; /* join error, exit without cleanup */
4453 }
4454
4455 exit_kernel:
4456 ret = pthread_join(apps_thread, &status);
4457 if (ret != 0) {
4458 perror("pthread_join");
4459 goto error; /* join error, exit without cleanup */
4460 }
4461
4462 exit_apps:
4463 ret = pthread_join(reg_apps_thread, &status);
4464 if (ret != 0) {
4465 perror("pthread_join");
4466 goto error; /* join error, exit without cleanup */
4467 }
4468
4469 exit_reg_apps:
4470 ret = pthread_join(dispatch_thread, &status);
4471 if (ret != 0) {
4472 perror("pthread_join");
4473 goto error; /* join error, exit without cleanup */
4474 }
4475
4476 exit_dispatch:
4477 ret = pthread_join(client_thread, &status);
4478 if (ret != 0) {
4479 perror("pthread_join");
4480 goto error; /* join error, exit without cleanup */
4481 }
4482
4483 ret = join_consumer_thread(&kconsumer_data);
4484 if (ret != 0) {
4485 perror("join_consumer");
4486 goto error; /* join error, exit without cleanup */
4487 }
4488
4489 exit_client:
4490 exit:
4491 /*
4492 * cleanup() is called when no other thread is running.
4493 */
4494 rcu_thread_online();
4495 cleanup();
4496 rcu_thread_offline();
4497 rcu_unregister_thread();
4498 if (!ret)
4499 exit(EXIT_SUCCESS);
4500 error:
4501 exit(EXIT_FAILURE);
4502 }
LTTng 2.0 tools and control repository
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