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7da0b7c686c314010bfd5106620e1892809b88c5
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify 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 <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_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 = CONFIG_CONSUMERD32_BIN;
175 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
178
179 static
180 void setup_consumerd_path(void)
181 {
182 const char *bin, *libdir;
183
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
188 */
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
202 }
203 #else
204 #error "Unknown bitness"
205 #endif
206
207 /*
208 * runtime env. var. overrides the build default.
209 */
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
213 }
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
217 }
218 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
223 if (libdir) {
224 consumerd64_libdir = libdir;
225 }
226 }
227
228 /*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231 static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233 {
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254 error:
255 return ret;
256 }
257
258 /*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263 static int check_thread_quit_pipe(int fd, uint32_t events)
264 {
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270 }
271
272 /*
273 * Return group ID of the tracing group or -1 if not found.
274 */
275 static gid_t allowed_group(void)
276 {
277 struct group *grp;
278
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289 }
290
291 /*
292 * Init thread quit pipe.
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296 static int init_thread_quit_pipe(void)
297 {
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306 error:
307 return ret;
308 }
309
310 /*
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
313 */
314 static void teardown_kernel_session(struct ltt_session *session)
315 {
316 if (!session->kernel_session) {
317 DBG3("No kernel session when tearingdown session");
318 return;
319 }
320
321 DBG("Tearing down kernel session");
322
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
329 }
330
331 trace_kernel_destroy_session(session->kernel_session);
332 }
333
334 /*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338 static void teardown_ust_session(struct ltt_session *session)
339 {
340 int ret;
341
342 if (!session->ust_session) {
343 DBG3("No UST session when tearingdown session");
344 return;
345 }
346
347 DBG("Tearing down UST session(s)");
348
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
353
354 trace_ust_destroy_session(session->ust_session);
355 }
356
357 /*
358 * Stop all threads by closing the thread quit pipe.
359 */
360 static void stop_threads(void)
361 {
362 int ret;
363
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret = notify_thread_pipe(thread_quit_pipe[1]);
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
374 }
375
376 /*
377 * Cleanup the daemon
378 */
379 static void cleanup(void)
380 {
381 int ret;
382 char *cmd;
383 struct ltt_session *sess, *stmp;
384
385 DBG("Cleaning up");
386
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
392
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
397 }
398 free(cmd);
399
400 DBG("Cleaning up all session");
401
402 /* Destroy session list mutex */
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
409 teardown_kernel_session(sess);
410 teardown_ust_session(sess);
411 free(sess);
412 }
413 }
414
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
417
418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
419
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
423 DBG("Unloading kernel modules");
424 modprobe_remove_lttng_all();
425 }
426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
429
430 /* <fun> */
431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
435 }
436
437 /*
438 * Send data on a unix socket using the liblttsessiondcomm API.
439 *
440 * Return lttcomm error code.
441 */
442 static int send_unix_sock(int sock, void *buf, size_t len)
443 {
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450 }
451
452 /*
453 * Free memory of a command context structure.
454 */
455 static void clean_command_ctx(struct command_ctx **cmd_ctx)
456 {
457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
461 }
462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
464 }
465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
467 }
468 }
469
470 /*
471 * Send all stream fds of kernel channel to the consumer.
472 */
473 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
476 {
477 int ret;
478 struct ltt_kernel_stream *stream;
479 struct lttcomm_consumer_msg lkm;
480
481 DBG("Sending streams of channel %s to kernel consumer",
482 channel->channel->name);
483
484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
491 if (ret < 0) {
492 perror("send consumer channel");
493 goto error;
494 }
495
496 /* Send streams */
497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
521 }
522 }
523
524 DBG("consumer channel streams sent");
525
526 return 0;
527
528 error:
529 return ret;
530 }
531
532 /*
533 * Send all stream fds of the kernel session to the consumer.
534 */
535 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
536 struct ltt_kernel_session *session)
537 {
538 int ret;
539 struct ltt_kernel_channel *chan;
540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
542
543 DBG("Sending metadata stream fd");
544
545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
546 if (session->consumer_fd == 0) {
547 session->consumer_fd = consumer_data->cmd_sock;
548 }
549
550 if (session->metadata_stream_fd != 0) {
551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
581 if (ret < 0) {
582 perror("send consumer stream");
583 goto error;
584 }
585 }
586
587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599 error:
600 return ret;
601 }
602
603 /*
604 * Notify UST applications using the shm mmap futex.
605 */
606 static int notify_ust_apps(int active)
607 {
608 char *wait_shm_mmap;
609
610 DBG("Notifying applications of session daemon state: %d", active);
611
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
615 goto error;
616 }
617
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
623
624 error:
625 return -1;
626 }
627
628 /*
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
632 *
633 * Return total size of the buffer pointed by buf.
634 */
635 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
636 {
637 int ret, buf_size;
638
639 buf_size = size;
640
641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
642 if (cmd_ctx->llm == NULL) {
643 perror("zmalloc");
644 ret = -ENOMEM;
645 goto error;
646 }
647
648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
651
652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
655 return buf_size;
656
657 error:
658 return ret;
659 }
660
661 /*
662 * Update the kernel poll set of all channel fd available over all tracing
663 * session. Add the wakeup pipe at the end of the set.
664 */
665 static int update_kernel_poll(struct lttng_poll_event *events)
666 {
667 int ret;
668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
671 DBG("Updating kernel poll set");
672
673 session_lock_list();
674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
675 session_lock(session);
676 if (session->kernel_session == NULL) {
677 session_unlock(session);
678 continue;
679 }
680
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
686 session_unlock(session);
687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
690 }
691 session_unlock(session);
692 }
693 session_unlock_list();
694
695 return 0;
696
697 error:
698 session_unlock_list();
699 return -1;
700 }
701
702 /*
703 * Find the channel fd from 'fd' over all tracing session. When found, check
704 * for new channel stream and send those stream fds to the kernel consumer.
705 *
706 * Useful for CPU hotplug feature.
707 */
708 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
709 {
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
716 session_lock_list();
717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
718 session_lock(session);
719 if (session->kernel_session == NULL) {
720 session_unlock(session);
721 continue;
722 }
723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
727 }
728
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
735 goto error;
736 }
737
738 /*
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
742 */
743 if (session->kernel_session->consumer_fds_sent == 1) {
744 ret = send_kconsumer_channel_streams(consumer_data,
745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
747 if (ret < 0) {
748 goto error;
749 }
750 }
751 goto error;
752 }
753 }
754 session_unlock(session);
755 }
756 session_unlock_list();
757 return ret;
758
759 error:
760 session_unlock(session);
761 session_unlock_list();
762 return ret;
763 }
764
765 /*
766 * For each tracing session, update newly registered apps.
767 */
768 static void update_ust_app(int app_sock)
769 {
770 struct ltt_session *sess, *stmp;
771
772 /* For all tracing session(s) */
773 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
774 if (sess->ust_session) {
775 ust_app_global_update(sess->ust_session, app_sock);
776 }
777 }
778 }
779
780 /*
781 * This thread manage event coming from the kernel.
782 *
783 * Features supported in this thread:
784 * -) CPU Hotplug
785 */
786 static void *thread_manage_kernel(void *data)
787 {
788 int ret, i, pollfd, update_poll_flag = 1;
789 uint32_t revents, nb_fd;
790 char tmp;
791 struct lttng_poll_event events;
792
793 DBG("Thread manage kernel started");
794
795 ret = create_thread_poll_set(&events, 2);
796 if (ret < 0) {
797 goto error;
798 }
799
800 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
801 if (ret < 0) {
802 goto error;
803 }
804
805 while (1) {
806 if (update_poll_flag == 1) {
807 /*
808 * Reset number of fd in the poll set. Always 2 since there is the thread
809 * quit pipe and the kernel pipe.
810 */
811 events.nb_fd = 2;
812
813 ret = update_kernel_poll(&events);
814 if (ret < 0) {
815 goto error;
816 }
817 update_poll_flag = 0;
818 }
819
820 nb_fd = LTTNG_POLL_GETNB(&events);
821
822 DBG("Thread kernel polling on %d fds", nb_fd);
823
824 /* Zeroed the poll events */
825 lttng_poll_reset(&events);
826
827 /* Poll infinite value of time */
828 ret = lttng_poll_wait(&events, -1);
829 if (ret < 0) {
830 goto error;
831 } else if (ret == 0) {
832 /* Should not happen since timeout is infinite */
833 ERR("Return value of poll is 0 with an infinite timeout.\n"
834 "This should not have happened! Continuing...");
835 continue;
836 }
837
838 for (i = 0; i < nb_fd; i++) {
839 /* Fetch once the poll data */
840 revents = LTTNG_POLL_GETEV(&events, i);
841 pollfd = LTTNG_POLL_GETFD(&events, i);
842
843 /* Thread quit pipe has been closed. Killing thread. */
844 ret = check_thread_quit_pipe(pollfd, revents);
845 if (ret) {
846 goto error;
847 }
848
849 /* Check for data on kernel pipe */
850 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
851 ret = read(kernel_poll_pipe[0], &tmp, 1);
852 update_poll_flag = 1;
853 continue;
854 } else {
855 /*
856 * New CPU detected by the kernel. Adding kernel stream to
857 * kernel session and updating the kernel consumer
858 */
859 if (revents & LPOLLIN) {
860 ret = update_kernel_stream(&kconsumer_data, pollfd);
861 if (ret < 0) {
862 continue;
863 }
864 break;
865 /*
866 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
867 * and unregister kernel stream at this point.
868 */
869 }
870 }
871 }
872 }
873
874 error:
875 DBG("Kernel thread dying");
876 close(kernel_poll_pipe[0]);
877 close(kernel_poll_pipe[1]);
878
879 lttng_poll_clean(&events);
880
881 return NULL;
882 }
883
884 /*
885 * This thread manage the consumer error sent back to the session daemon.
886 */
887 static void *thread_manage_consumer(void *data)
888 {
889 int sock = 0, i, ret, pollfd;
890 uint32_t revents, nb_fd;
891 enum lttcomm_return_code code;
892 struct lttng_poll_event events;
893 struct consumer_data *consumer_data = data;
894
895 DBG("[thread] Manage consumer started");
896
897 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
898 if (ret < 0) {
899 goto error;
900 }
901
902 /*
903 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
904 * Nothing more will be added to this poll set.
905 */
906 ret = create_thread_poll_set(&events, 2);
907 if (ret < 0) {
908 goto error;
909 }
910
911 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
912 if (ret < 0) {
913 goto error;
914 }
915
916 nb_fd = LTTNG_POLL_GETNB(&events);
917
918 /* Inifinite blocking call, waiting for transmission */
919 ret = lttng_poll_wait(&events, -1);
920 if (ret < 0) {
921 goto error;
922 }
923
924 for (i = 0; i < nb_fd; i++) {
925 /* Fetch once the poll data */
926 revents = LTTNG_POLL_GETEV(&events, i);
927 pollfd = LTTNG_POLL_GETFD(&events, i);
928
929 /* Thread quit pipe has been closed. Killing thread. */
930 ret = check_thread_quit_pipe(pollfd, revents);
931 if (ret) {
932 goto error;
933 }
934
935 /* Event on the registration socket */
936 if (pollfd == consumer_data->err_sock) {
937 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
938 ERR("consumer err socket poll error");
939 goto error;
940 }
941 }
942 }
943
944 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
945 if (sock < 0) {
946 goto error;
947 }
948
949 DBG2("Receiving code from consumer err_sock");
950
951 /* Getting status code from kconsumerd */
952 ret = lttcomm_recv_unix_sock(sock, &code,
953 sizeof(enum lttcomm_return_code));
954 if (ret <= 0) {
955 goto error;
956 }
957
958 if (code == CONSUMERD_COMMAND_SOCK_READY) {
959 consumer_data->cmd_sock =
960 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
961 if (consumer_data->cmd_sock < 0) {
962 sem_post(&consumer_data->sem);
963 PERROR("consumer connect");
964 goto error;
965 }
966 /* Signal condition to tell that the kconsumerd is ready */
967 sem_post(&consumer_data->sem);
968 DBG("consumer command socket ready");
969 } else {
970 ERR("consumer error when waiting for SOCK_READY : %s",
971 lttcomm_get_readable_code(-code));
972 goto error;
973 }
974
975 /* Remove the kconsumerd error sock since we've established a connexion */
976 ret = lttng_poll_del(&events, consumer_data->err_sock);
977 if (ret < 0) {
978 goto error;
979 }
980
981 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
982 if (ret < 0) {
983 goto error;
984 }
985
986 /* Update number of fd */
987 nb_fd = LTTNG_POLL_GETNB(&events);
988
989 /* Inifinite blocking call, waiting for transmission */
990 ret = lttng_poll_wait(&events, -1);
991 if (ret < 0) {
992 goto error;
993 }
994
995 for (i = 0; i < nb_fd; i++) {
996 /* Fetch once the poll data */
997 revents = LTTNG_POLL_GETEV(&events, i);
998 pollfd = LTTNG_POLL_GETFD(&events, i);
999
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret = check_thread_quit_pipe(pollfd, revents);
1002 if (ret) {
1003 goto error;
1004 }
1005
1006 /* Event on the kconsumerd socket */
1007 if (pollfd == sock) {
1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1009 ERR("consumer err socket second poll error");
1010 goto error;
1011 }
1012 }
1013 }
1014
1015 /* Wait for any kconsumerd error */
1016 ret = lttcomm_recv_unix_sock(sock, &code,
1017 sizeof(enum lttcomm_return_code));
1018 if (ret <= 0) {
1019 ERR("consumer closed the command socket");
1020 goto error;
1021 }
1022
1023 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1024
1025 error:
1026 DBG("consumer thread dying");
1027 close(consumer_data->err_sock);
1028 close(consumer_data->cmd_sock);
1029 close(sock);
1030
1031 unlink(consumer_data->err_unix_sock_path);
1032 unlink(consumer_data->cmd_unix_sock_path);
1033 consumer_data->pid = 0;
1034
1035 lttng_poll_clean(&events);
1036
1037 return NULL;
1038 }
1039
1040 /*
1041 * This thread manage application communication.
1042 */
1043 static void *thread_manage_apps(void *data)
1044 {
1045 int i, ret, pollfd;
1046 uint32_t revents, nb_fd;
1047 struct ust_command ust_cmd;
1048 struct lttng_poll_event events;
1049
1050 DBG("[thread] Manage application started");
1051
1052 rcu_register_thread();
1053 rcu_thread_online();
1054
1055 ret = create_thread_poll_set(&events, 2);
1056 if (ret < 0) {
1057 goto error;
1058 }
1059
1060 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1061 if (ret < 0) {
1062 goto error;
1063 }
1064
1065 while (1) {
1066 /* Zeroed the events structure */
1067 lttng_poll_reset(&events);
1068
1069 nb_fd = LTTNG_POLL_GETNB(&events);
1070
1071 DBG("Apps thread polling on %d fds", nb_fd);
1072
1073 /* Inifinite blocking call, waiting for transmission */
1074 ret = lttng_poll_wait(&events, -1);
1075 if (ret < 0) {
1076 goto error;
1077 }
1078
1079 for (i = 0; i < nb_fd; i++) {
1080 /* Fetch once the poll data */
1081 revents = LTTNG_POLL_GETEV(&events, i);
1082 pollfd = LTTNG_POLL_GETFD(&events, i);
1083
1084 /* Thread quit pipe has been closed. Killing thread. */
1085 ret = check_thread_quit_pipe(pollfd, revents);
1086 if (ret) {
1087 goto error;
1088 }
1089
1090 /* Inspect the apps cmd pipe */
1091 if (pollfd == apps_cmd_pipe[0]) {
1092 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1093 ERR("Apps command pipe error");
1094 goto error;
1095 } else if (revents & LPOLLIN) {
1096 /* Empty pipe */
1097 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1098 if (ret < 0 || ret < sizeof(ust_cmd)) {
1099 perror("read apps cmd pipe");
1100 goto error;
1101 }
1102
1103 /* Register applicaton to the session daemon */
1104 ret = ust_app_register(&ust_cmd.reg_msg,
1105 ust_cmd.sock);
1106 if (ret == -ENOMEM) {
1107 goto error;
1108 } else if (ret < 0) {
1109 break;
1110 }
1111
1112 /*
1113 * Validate UST version compatibility.
1114 */
1115 ret = ust_app_validate_version(ust_cmd.sock);
1116 if (ret >= 0) {
1117 /*
1118 * Add channel(s) and event(s) to newly registered apps
1119 * from lttng global UST domain.
1120 */
1121 update_ust_app(ust_cmd.sock);
1122 }
1123
1124 ret = ust_app_register_done(ust_cmd.sock);
1125 if (ret < 0) {
1126 /*
1127 * If the registration is not possible, we simply
1128 * unregister the apps and continue
1129 */
1130 ust_app_unregister(ust_cmd.sock);
1131 } else {
1132 /*
1133 * We just need here to monitor the close of the UST
1134 * socket and poll set monitor those by default.
1135 */
1136 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1137 if (ret < 0) {
1138 goto error;
1139 }
1140
1141 DBG("Apps with sock %d added to poll set",
1142 ust_cmd.sock);
1143 }
1144
1145 break;
1146 }
1147 } else {
1148 /*
1149 * At this point, we know that a registered application made
1150 * the event at poll_wait.
1151 */
1152 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1153 /* Removing from the poll set */
1154 ret = lttng_poll_del(&events, pollfd);
1155 if (ret < 0) {
1156 goto error;
1157 }
1158
1159 /* Socket closed on remote end. */
1160 ust_app_unregister(pollfd);
1161 break;
1162 }
1163 }
1164 }
1165 }
1166
1167 error:
1168 DBG("Application communication apps dying");
1169 close(apps_cmd_pipe[0]);
1170 close(apps_cmd_pipe[1]);
1171
1172 lttng_poll_clean(&events);
1173
1174 rcu_thread_offline();
1175 rcu_unregister_thread();
1176 return NULL;
1177 }
1178
1179 /*
1180 * Dispatch request from the registration threads to the application
1181 * communication thread.
1182 */
1183 static void *thread_dispatch_ust_registration(void *data)
1184 {
1185 int ret;
1186 struct cds_wfq_node *node;
1187 struct ust_command *ust_cmd = NULL;
1188
1189 DBG("[thread] Dispatch UST command started");
1190
1191 while (!dispatch_thread_exit) {
1192 /* Atomically prepare the queue futex */
1193 futex_nto1_prepare(&ust_cmd_queue.futex);
1194
1195 do {
1196 /* Dequeue command for registration */
1197 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1198 if (node == NULL) {
1199 DBG("Woken up but nothing in the UST command queue");
1200 /* Continue thread execution */
1201 break;
1202 }
1203
1204 ust_cmd = caa_container_of(node, struct ust_command, node);
1205
1206 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1207 " gid:%d sock:%d name:%s (version %d.%d)",
1208 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1209 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1210 ust_cmd->sock, ust_cmd->reg_msg.name,
1211 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1212 /*
1213 * Inform apps thread of the new application registration. This
1214 * call is blocking so we can be assured that the data will be read
1215 * at some point in time or wait to the end of the world :)
1216 */
1217 ret = write(apps_cmd_pipe[1], ust_cmd,
1218 sizeof(struct ust_command));
1219 if (ret < 0) {
1220 perror("write apps cmd pipe");
1221 if (errno == EBADF) {
1222 /*
1223 * We can't inform the application thread to process
1224 * registration. We will exit or else application
1225 * registration will not occur and tracing will never
1226 * start.
1227 */
1228 goto error;
1229 }
1230 }
1231 free(ust_cmd);
1232 } while (node != NULL);
1233
1234 /* Futex wait on queue. Blocking call on futex() */
1235 futex_nto1_wait(&ust_cmd_queue.futex);
1236 }
1237
1238 error:
1239 DBG("Dispatch thread dying");
1240 return NULL;
1241 }
1242
1243 /*
1244 * This thread manage application registration.
1245 */
1246 static void *thread_registration_apps(void *data)
1247 {
1248 int sock = 0, i, ret, pollfd;
1249 uint32_t revents, nb_fd;
1250 struct lttng_poll_event events;
1251 /*
1252 * Get allocated in this thread, enqueued to a global queue, dequeued and
1253 * freed in the manage apps thread.
1254 */
1255 struct ust_command *ust_cmd = NULL;
1256
1257 DBG("[thread] Manage application registration started");
1258
1259 ret = lttcomm_listen_unix_sock(apps_sock);
1260 if (ret < 0) {
1261 goto error;
1262 }
1263
1264 /*
1265 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1266 * more will be added to this poll set.
1267 */
1268 ret = create_thread_poll_set(&events, 2);
1269 if (ret < 0) {
1270 goto error;
1271 }
1272
1273 /* Add the application registration socket */
1274 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1275 if (ret < 0) {
1276 goto error;
1277 }
1278
1279 /* Notify all applications to register */
1280 ret = notify_ust_apps(1);
1281 if (ret < 0) {
1282 ERR("Failed to notify applications or create the wait shared memory.\n"
1283 "Execution continues but there might be problem for already\n"
1284 "running applications that wishes to register.");
1285 }
1286
1287 while (1) {
1288 DBG("Accepting application registration");
1289
1290 nb_fd = LTTNG_POLL_GETNB(&events);
1291
1292 /* Inifinite blocking call, waiting for transmission */
1293 ret = lttng_poll_wait(&events, -1);
1294 if (ret < 0) {
1295 goto error;
1296 }
1297
1298 for (i = 0; i < nb_fd; i++) {
1299 /* Fetch once the poll data */
1300 revents = LTTNG_POLL_GETEV(&events, i);
1301 pollfd = LTTNG_POLL_GETFD(&events, i);
1302
1303 /* Thread quit pipe has been closed. Killing thread. */
1304 ret = check_thread_quit_pipe(pollfd, revents);
1305 if (ret) {
1306 goto error;
1307 }
1308
1309 /* Event on the registration socket */
1310 if (pollfd == apps_sock) {
1311 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1312 ERR("Register apps socket poll error");
1313 goto error;
1314 } else if (revents & LPOLLIN) {
1315 sock = lttcomm_accept_unix_sock(apps_sock);
1316 if (sock < 0) {
1317 goto error;
1318 }
1319
1320 /* Create UST registration command for enqueuing */
1321 ust_cmd = zmalloc(sizeof(struct ust_command));
1322 if (ust_cmd == NULL) {
1323 perror("ust command zmalloc");
1324 goto error;
1325 }
1326
1327 /*
1328 * Using message-based transmissions to ensure we don't
1329 * have to deal with partially received messages.
1330 */
1331 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1332 sizeof(struct ust_register_msg));
1333 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1334 if (ret < 0) {
1335 perror("lttcomm_recv_unix_sock register apps");
1336 } else {
1337 ERR("Wrong size received on apps register");
1338 }
1339 free(ust_cmd);
1340 close(sock);
1341 continue;
1342 }
1343
1344 ust_cmd->sock = sock;
1345
1346 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1347 " gid:%d sock:%d name:%s (version %d.%d)",
1348 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1349 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1350 ust_cmd->sock, ust_cmd->reg_msg.name,
1351 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1352
1353 /*
1354 * Lock free enqueue the registration request. The red pill
1355 * has been taken! This apps will be part of the *system*.
1356 */
1357 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1358
1359 /*
1360 * Wake the registration queue futex. Implicit memory
1361 * barrier with the exchange in cds_wfq_enqueue.
1362 */
1363 futex_nto1_wake(&ust_cmd_queue.futex);
1364 }
1365 }
1366 }
1367 }
1368
1369 error:
1370 DBG("UST Registration thread dying");
1371
1372 /* Notify that the registration thread is gone */
1373 notify_ust_apps(0);
1374
1375 close(apps_sock);
1376 close(sock);
1377 unlink(apps_unix_sock_path);
1378
1379 lttng_poll_clean(&events);
1380
1381 return NULL;
1382 }
1383
1384 /*
1385 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1386 * exec or it will fails.
1387 */
1388 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1389 {
1390 int ret;
1391 struct timespec timeout;
1392
1393 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1394 timeout.tv_nsec = 0;
1395
1396 /* Setup semaphore */
1397 ret = sem_init(&consumer_data->sem, 0, 0);
1398 if (ret < 0) {
1399 PERROR("sem_init consumer semaphore");
1400 goto error;
1401 }
1402
1403 ret = pthread_create(&consumer_data->thread, NULL,
1404 thread_manage_consumer, consumer_data);
1405 if (ret != 0) {
1406 PERROR("pthread_create consumer");
1407 ret = -1;
1408 goto error;
1409 }
1410
1411 /* Get time for sem_timedwait absolute timeout */
1412 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1413 if (ret < 0) {
1414 PERROR("clock_gettime spawn consumer");
1415 /* Infinite wait for the kconsumerd thread to be ready */
1416 ret = sem_wait(&consumer_data->sem);
1417 } else {
1418 /* Normal timeout if the gettime was successful */
1419 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1420 ret = sem_timedwait(&consumer_data->sem, &timeout);
1421 }
1422
1423 if (ret < 0) {
1424 if (errno == ETIMEDOUT) {
1425 /*
1426 * Call has timed out so we kill the kconsumerd_thread and return
1427 * an error.
1428 */
1429 ERR("The consumer thread was never ready. Killing it");
1430 ret = pthread_cancel(consumer_data->thread);
1431 if (ret < 0) {
1432 PERROR("pthread_cancel consumer thread");
1433 }
1434 } else {
1435 PERROR("semaphore wait failed consumer thread");
1436 }
1437 goto error;
1438 }
1439
1440 pthread_mutex_lock(&consumer_data->pid_mutex);
1441 if (consumer_data->pid == 0) {
1442 ERR("Kconsumerd did not start");
1443 pthread_mutex_unlock(&consumer_data->pid_mutex);
1444 goto error;
1445 }
1446 pthread_mutex_unlock(&consumer_data->pid_mutex);
1447
1448 return 0;
1449
1450 error:
1451 return ret;
1452 }
1453
1454 /*
1455 * Join consumer thread
1456 */
1457 static int join_consumer_thread(struct consumer_data *consumer_data)
1458 {
1459 void *status;
1460 int ret;
1461
1462 if (consumer_data->pid != 0) {
1463 ret = kill(consumer_data->pid, SIGTERM);
1464 if (ret) {
1465 ERR("Error killing consumer daemon");
1466 return ret;
1467 }
1468 return pthread_join(consumer_data->thread, &status);
1469 } else {
1470 return 0;
1471 }
1472 }
1473
1474 /*
1475 * Fork and exec a consumer daemon (consumerd).
1476 *
1477 * Return pid if successful else -1.
1478 */
1479 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1480 {
1481 int ret;
1482 pid_t pid;
1483 const char *consumer_to_use;
1484 const char *verbosity;
1485 struct stat st;
1486
1487 DBG("Spawning consumerd");
1488
1489 pid = fork();
1490 if (pid == 0) {
1491 /*
1492 * Exec consumerd.
1493 */
1494 if (opt_verbose_consumer) {
1495 verbosity = "--verbose";
1496 } else {
1497 verbosity = "--quiet";
1498 }
1499 switch (consumer_data->type) {
1500 case LTTNG_CONSUMER_KERNEL:
1501 /*
1502 * Find out which consumerd to execute. We will first try the
1503 * 64-bit path, then the sessiond's installation directory, and
1504 * fallback on the 32-bit one,
1505 */
1506 DBG3("Looking for a kernel consumer at these locations:");
1507 DBG3(" 1) %s", consumerd64_bin);
1508 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1509 DBG3(" 3) %s", consumerd32_bin);
1510 if (stat(consumerd64_bin, &st) == 0) {
1511 DBG3("Found location #1");
1512 consumer_to_use = consumerd64_bin;
1513 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1514 DBG3("Found location #2");
1515 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1516 } else if (stat(consumerd32_bin, &st) == 0) {
1517 DBG3("Found location #3");
1518 consumer_to_use = consumerd32_bin;
1519 } else {
1520 DBG("Could not find any valid consumerd executable");
1521 break;
1522 }
1523 DBG("Using kernel consumer at: %s", consumer_to_use);
1524 execl(consumer_to_use,
1525 "lttng-consumerd", verbosity, "-k",
1526 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1527 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1528 NULL);
1529 break;
1530 case LTTNG_CONSUMER64_UST:
1531 {
1532 char *tmpnew = NULL;
1533
1534 if (consumerd64_libdir[0] != '\0') {
1535 char *tmp;
1536 size_t tmplen;
1537
1538 tmp = getenv("LD_LIBRARY_PATH");
1539 if (!tmp) {
1540 tmp = "";
1541 }
1542 tmplen = strlen("LD_LIBRARY_PATH=")
1543 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1544 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1545 if (!tmpnew) {
1546 ret = -ENOMEM;
1547 goto error;
1548 }
1549 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1550 strcat(tmpnew, consumerd64_libdir);
1551 if (tmp[0] != '\0') {
1552 strcat(tmpnew, ":");
1553 strcat(tmpnew, tmp);
1554 }
1555 ret = putenv(tmpnew);
1556 if (ret) {
1557 ret = -errno;
1558 goto error;
1559 }
1560 }
1561 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1562 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1563 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1564 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1565 NULL);
1566 if (consumerd64_libdir[0] != '\0') {
1567 free(tmpnew);
1568 }
1569 if (ret) {
1570 goto error;
1571 }
1572 break;
1573 }
1574 case LTTNG_CONSUMER32_UST:
1575 {
1576 char *tmpnew = NULL;
1577
1578 if (consumerd32_libdir[0] != '\0') {
1579 char *tmp;
1580 size_t tmplen;
1581
1582 tmp = getenv("LD_LIBRARY_PATH");
1583 if (!tmp) {
1584 tmp = "";
1585 }
1586 tmplen = strlen("LD_LIBRARY_PATH=")
1587 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1588 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1589 if (!tmpnew) {
1590 ret = -ENOMEM;
1591 goto error;
1592 }
1593 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1594 strcat(tmpnew, consumerd32_libdir);
1595 if (tmp[0] != '\0') {
1596 strcat(tmpnew, ":");
1597 strcat(tmpnew, tmp);
1598 }
1599 ret = putenv(tmpnew);
1600 if (ret) {
1601 ret = -errno;
1602 goto error;
1603 }
1604 }
1605 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1606 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1607 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1608 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1609 NULL);
1610 if (consumerd32_libdir[0] != '\0') {
1611 free(tmpnew);
1612 }
1613 if (ret) {
1614 goto error;
1615 }
1616 break;
1617 }
1618 default:
1619 perror("unknown consumer type");
1620 exit(EXIT_FAILURE);
1621 }
1622 if (errno != 0) {
1623 perror("kernel start consumer exec");
1624 }
1625 exit(EXIT_FAILURE);
1626 } else if (pid > 0) {
1627 ret = pid;
1628 } else {
1629 perror("start consumer fork");
1630 ret = -errno;
1631 }
1632 error:
1633 return ret;
1634 }
1635
1636 /*
1637 * Spawn the consumerd daemon and session daemon thread.
1638 */
1639 static int start_consumerd(struct consumer_data *consumer_data)
1640 {
1641 int ret;
1642
1643 pthread_mutex_lock(&consumer_data->pid_mutex);
1644 if (consumer_data->pid != 0) {
1645 pthread_mutex_unlock(&consumer_data->pid_mutex);
1646 goto end;
1647 }
1648
1649 ret = spawn_consumerd(consumer_data);
1650 if (ret < 0) {
1651 ERR("Spawning consumerd failed");
1652 pthread_mutex_unlock(&consumer_data->pid_mutex);
1653 goto error;
1654 }
1655
1656 /* Setting up the consumer_data pid */
1657 consumer_data->pid = ret;
1658 DBG2("Consumer pid %d", consumer_data->pid);
1659 pthread_mutex_unlock(&consumer_data->pid_mutex);
1660
1661 DBG2("Spawning consumer control thread");
1662 ret = spawn_consumer_thread(consumer_data);
1663 if (ret < 0) {
1664 ERR("Fatal error spawning consumer control thread");
1665 goto error;
1666 }
1667
1668 end:
1669 return 0;
1670
1671 error:
1672 return ret;
1673 }
1674
1675 /*
1676 * Check version of the lttng-modules.
1677 */
1678 static int validate_lttng_modules_version(void)
1679 {
1680 return kernel_validate_version(kernel_tracer_fd);
1681 }
1682
1683 /*
1684 * Setup necessary data for kernel tracer action.
1685 */
1686 static int init_kernel_tracer(void)
1687 {
1688 int ret;
1689
1690 /* Modprobe lttng kernel modules */
1691 ret = modprobe_lttng_control();
1692 if (ret < 0) {
1693 goto error;
1694 }
1695
1696 /* Open debugfs lttng */
1697 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1698 if (kernel_tracer_fd < 0) {
1699 DBG("Failed to open %s", module_proc_lttng);
1700 ret = -1;
1701 goto error_open;
1702 }
1703
1704 /* Validate kernel version */
1705 ret = validate_lttng_modules_version();
1706 if (ret < 0) {
1707 goto error_version;
1708 }
1709
1710 ret = modprobe_lttng_data();
1711 if (ret < 0) {
1712 goto error_modules;
1713 }
1714
1715 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1716 return 0;
1717
1718 error_version:
1719 modprobe_remove_lttng_control();
1720 close(kernel_tracer_fd);
1721 kernel_tracer_fd = 0;
1722 return LTTCOMM_KERN_VERSION;
1723
1724 error_modules:
1725 close(kernel_tracer_fd);
1726
1727 error_open:
1728 modprobe_remove_lttng_control();
1729
1730 error:
1731 WARN("No kernel tracer available");
1732 kernel_tracer_fd = 0;
1733 return LTTCOMM_KERN_NA;
1734 }
1735
1736 /*
1737 * Init tracing by creating trace directory and sending fds kernel consumer.
1738 */
1739 static int init_kernel_tracing(struct ltt_kernel_session *session)
1740 {
1741 int ret = 0;
1742
1743 if (session->consumer_fds_sent == 0) {
1744 /*
1745 * Assign default kernel consumer socket if no consumer assigned to the
1746 * kernel session. At this point, it's NOT suppose to be 0 but this is
1747 * an extra security check.
1748 */
1749 if (session->consumer_fd == 0) {
1750 session->consumer_fd = kconsumer_data.cmd_sock;
1751 }
1752
1753 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1754 if (ret < 0) {
1755 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1756 goto error;
1757 }
1758
1759 session->consumer_fds_sent = 1;
1760 }
1761
1762 error:
1763 return ret;
1764 }
1765
1766 /*
1767 * Create an UST session and add it to the session ust list.
1768 */
1769 static int create_ust_session(struct ltt_session *session,
1770 struct lttng_domain *domain)
1771 {
1772 struct ltt_ust_session *lus = NULL;
1773 int ret;
1774
1775 switch (domain->type) {
1776 case LTTNG_DOMAIN_UST:
1777 break;
1778 default:
1779 ret = LTTCOMM_UNKNOWN_DOMAIN;
1780 goto error;
1781 }
1782
1783 DBG("Creating UST session");
1784
1785 lus = trace_ust_create_session(session->path, session->id, domain);
1786 if (lus == NULL) {
1787 ret = LTTCOMM_UST_SESS_FAIL;
1788 goto error;
1789 }
1790
1791 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1792 session->uid, session->gid);
1793 if (ret < 0) {
1794 if (ret != -EEXIST) {
1795 ERR("Trace directory creation error");
1796 ret = LTTCOMM_UST_SESS_FAIL;
1797 goto error;
1798 }
1799 }
1800
1801 /* The domain type dictate different actions on session creation */
1802 switch (domain->type) {
1803 case LTTNG_DOMAIN_UST:
1804 /* No ustctl for the global UST domain */
1805 break;
1806 default:
1807 ERR("Unknown UST domain on create session %d", domain->type);
1808 goto error;
1809 }
1810 lus->uid = session->uid;
1811 lus->gid = session->gid;
1812 session->ust_session = lus;
1813
1814 return LTTCOMM_OK;
1815
1816 error:
1817 free(lus);
1818 return ret;
1819 }
1820
1821 /*
1822 * Create a kernel tracer session then create the default channel.
1823 */
1824 static int create_kernel_session(struct ltt_session *session)
1825 {
1826 int ret;
1827
1828 DBG("Creating kernel session");
1829
1830 ret = kernel_create_session(session, kernel_tracer_fd);
1831 if (ret < 0) {
1832 ret = LTTCOMM_KERN_SESS_FAIL;
1833 goto error;
1834 }
1835
1836 /* Set kernel consumer socket fd */
1837 if (kconsumer_data.cmd_sock) {
1838 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1839 }
1840
1841 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1842 S_IRWXU | S_IRWXG, session->uid, session->gid);
1843 if (ret < 0) {
1844 if (ret != -EEXIST) {
1845 ERR("Trace directory creation error");
1846 goto error;
1847 }
1848 }
1849 session->kernel_session->uid = session->uid;
1850 session->kernel_session->gid = session->gid;
1851
1852 error:
1853 return ret;
1854 }
1855
1856 /*
1857 * Check if the UID or GID match the session. Root user has access to all
1858 * sessions.
1859 */
1860 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1861 {
1862 if (uid != session->uid && gid != session->gid && uid != 0) {
1863 return 0;
1864 } else {
1865 return 1;
1866 }
1867 }
1868
1869 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1870 {
1871 unsigned int i = 0;
1872 struct ltt_session *session;
1873
1874 DBG("Counting number of available session for UID %d GID %d",
1875 uid, gid);
1876 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1877 /*
1878 * Only list the sessions the user can control.
1879 */
1880 if (!session_access_ok(session, uid, gid)) {
1881 continue;
1882 }
1883 i++;
1884 }
1885 return i;
1886 }
1887
1888 /*
1889 * Using the session list, filled a lttng_session array to send back to the
1890 * client for session listing.
1891 *
1892 * The session list lock MUST be acquired before calling this function. Use
1893 * session_lock_list() and session_unlock_list().
1894 */
1895 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1896 gid_t gid)
1897 {
1898 unsigned int i = 0;
1899 struct ltt_session *session;
1900
1901 DBG("Getting all available session for UID %d GID %d",
1902 uid, gid);
1903 /*
1904 * Iterate over session list and append data after the control struct in
1905 * the buffer.
1906 */
1907 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1908 /*
1909 * Only list the sessions the user can control.
1910 */
1911 if (!session_access_ok(session, uid, gid)) {
1912 continue;
1913 }
1914 strncpy(sessions[i].path, session->path, PATH_MAX);
1915 sessions[i].path[PATH_MAX - 1] = '\0';
1916 strncpy(sessions[i].name, session->name, NAME_MAX);
1917 sessions[i].name[NAME_MAX - 1] = '\0';
1918 sessions[i].enabled = session->enabled;
1919 i++;
1920 }
1921 }
1922
1923 /*
1924 * Fill lttng_channel array of all channels.
1925 */
1926 static void list_lttng_channels(int domain, struct ltt_session *session,
1927 struct lttng_channel *channels)
1928 {
1929 int i = 0;
1930 struct ltt_kernel_channel *kchan;
1931
1932 DBG("Listing channels for session %s", session->name);
1933
1934 switch (domain) {
1935 case LTTNG_DOMAIN_KERNEL:
1936 /* Kernel channels */
1937 if (session->kernel_session != NULL) {
1938 cds_list_for_each_entry(kchan,
1939 &session->kernel_session->channel_list.head, list) {
1940 /* Copy lttng_channel struct to array */
1941 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1942 channels[i].enabled = kchan->enabled;
1943 i++;
1944 }
1945 }
1946 break;
1947 case LTTNG_DOMAIN_UST:
1948 {
1949 struct lttng_ht_iter iter;
1950 struct ltt_ust_channel *uchan;
1951
1952 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1953 &iter.iter, uchan, node.node) {
1954 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1955 channels[i].attr.overwrite = uchan->attr.overwrite;
1956 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1957 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1958 channels[i].attr.switch_timer_interval =
1959 uchan->attr.switch_timer_interval;
1960 channels[i].attr.read_timer_interval =
1961 uchan->attr.read_timer_interval;
1962 channels[i].enabled = uchan->enabled;
1963 switch (uchan->attr.output) {
1964 case LTTNG_UST_MMAP:
1965 default:
1966 channels[i].attr.output = LTTNG_EVENT_MMAP;
1967 break;
1968 }
1969 i++;
1970 }
1971 break;
1972 }
1973 default:
1974 break;
1975 }
1976 }
1977
1978 /*
1979 * Create a list of ust global domain events.
1980 */
1981 static int list_lttng_ust_global_events(char *channel_name,
1982 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1983 {
1984 int i = 0, ret = 0;
1985 unsigned int nb_event = 0;
1986 struct lttng_ht_iter iter;
1987 struct lttng_ht_node_str *node;
1988 struct ltt_ust_channel *uchan;
1989 struct ltt_ust_event *uevent;
1990 struct lttng_event *tmp;
1991
1992 DBG("Listing UST global events for channel %s", channel_name);
1993
1994 rcu_read_lock();
1995
1996 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
1997 node = lttng_ht_iter_get_node_str(&iter);
1998 if (node == NULL) {
1999 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2000 goto error;
2001 }
2002
2003 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2004
2005 nb_event += lttng_ht_get_count(uchan->events);
2006
2007 if (nb_event == 0) {
2008 ret = nb_event;
2009 goto error;
2010 }
2011
2012 DBG3("Listing UST global %d events", nb_event);
2013
2014 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2015 if (tmp == NULL) {
2016 ret = -LTTCOMM_FATAL;
2017 goto error;
2018 }
2019
2020 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2021 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2022 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2023 tmp[i].enabled = uevent->enabled;
2024 switch (uevent->attr.instrumentation) {
2025 case LTTNG_UST_TRACEPOINT:
2026 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2027 break;
2028 case LTTNG_UST_PROBE:
2029 tmp[i].type = LTTNG_EVENT_PROBE;
2030 break;
2031 case LTTNG_UST_FUNCTION:
2032 tmp[i].type = LTTNG_EVENT_FUNCTION;
2033 break;
2034 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2035 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2036 break;
2037 }
2038 i++;
2039 }
2040
2041 ret = nb_event;
2042 *events = tmp;
2043
2044 error:
2045 rcu_read_unlock();
2046 return ret;
2047 }
2048
2049 /*
2050 * Fill lttng_event array of all kernel events in the channel.
2051 */
2052 static int list_lttng_kernel_events(char *channel_name,
2053 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2054 {
2055 int i = 0, ret;
2056 unsigned int nb_event;
2057 struct ltt_kernel_event *event;
2058 struct ltt_kernel_channel *kchan;
2059
2060 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2061 if (kchan == NULL) {
2062 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2063 goto error;
2064 }
2065
2066 nb_event = kchan->event_count;
2067
2068 DBG("Listing events for channel %s", kchan->channel->name);
2069
2070 if (nb_event == 0) {
2071 ret = nb_event;
2072 goto error;
2073 }
2074
2075 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2076 if (*events == NULL) {
2077 ret = LTTCOMM_FATAL;
2078 goto error;
2079 }
2080
2081 /* Kernel channels */
2082 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2083 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2084 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2085 (*events)[i].enabled = event->enabled;
2086 switch (event->event->instrumentation) {
2087 case LTTNG_KERNEL_TRACEPOINT:
2088 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2089 break;
2090 case LTTNG_KERNEL_KPROBE:
2091 case LTTNG_KERNEL_KRETPROBE:
2092 (*events)[i].type = LTTNG_EVENT_PROBE;
2093 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2094 sizeof(struct lttng_kernel_kprobe));
2095 break;
2096 case LTTNG_KERNEL_FUNCTION:
2097 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2098 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2099 sizeof(struct lttng_kernel_function));
2100 break;
2101 case LTTNG_KERNEL_NOOP:
2102 (*events)[i].type = LTTNG_EVENT_NOOP;
2103 break;
2104 case LTTNG_KERNEL_SYSCALL:
2105 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2106 break;
2107 case LTTNG_KERNEL_ALL:
2108 assert(0);
2109 break;
2110 }
2111 i++;
2112 }
2113
2114 return nb_event;
2115
2116 error:
2117 return ret;
2118 }
2119
2120 /*
2121 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2122 */
2123 static int cmd_disable_channel(struct ltt_session *session,
2124 int domain, char *channel_name)
2125 {
2126 int ret;
2127 struct ltt_ust_session *usess;
2128
2129 usess = session->ust_session;
2130
2131 switch (domain) {
2132 case LTTNG_DOMAIN_KERNEL:
2133 {
2134 ret = channel_kernel_disable(session->kernel_session,
2135 channel_name);
2136 if (ret != LTTCOMM_OK) {
2137 goto error;
2138 }
2139
2140 kernel_wait_quiescent(kernel_tracer_fd);
2141 break;
2142 }
2143 case LTTNG_DOMAIN_UST:
2144 {
2145 struct ltt_ust_channel *uchan;
2146 struct lttng_ht *chan_ht;
2147
2148 chan_ht = usess->domain_global.channels;
2149
2150 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2151 if (uchan == NULL) {
2152 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2153 goto error;
2154 }
2155
2156 ret = channel_ust_disable(usess, domain, uchan);
2157 if (ret != LTTCOMM_OK) {
2158 goto error;
2159 }
2160 break;
2161 }
2162 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2163 case LTTNG_DOMAIN_UST_EXEC_NAME:
2164 case LTTNG_DOMAIN_UST_PID:
2165 ret = LTTCOMM_NOT_IMPLEMENTED;
2166 goto error;
2167 default:
2168 ret = LTTCOMM_UNKNOWN_DOMAIN;
2169 goto error;
2170 }
2171
2172 ret = LTTCOMM_OK;
2173
2174 error:
2175 return ret;
2176 }
2177
2178 /*
2179 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2180 */
2181 static int cmd_enable_channel(struct ltt_session *session,
2182 int domain, struct lttng_channel *attr)
2183 {
2184 int ret;
2185 struct ltt_ust_session *usess = session->ust_session;
2186 struct lttng_ht *chan_ht;
2187
2188 DBG("Enabling channel %s for session %s", attr->name, session->name);
2189
2190 switch (domain) {
2191 case LTTNG_DOMAIN_KERNEL:
2192 {
2193 struct ltt_kernel_channel *kchan;
2194
2195 kchan = trace_kernel_get_channel_by_name(attr->name,
2196 session->kernel_session);
2197 if (kchan == NULL) {
2198 ret = channel_kernel_create(session->kernel_session,
2199 attr, kernel_poll_pipe[1]);
2200 } else {
2201 ret = channel_kernel_enable(session->kernel_session, kchan);
2202 }
2203
2204 if (ret != LTTCOMM_OK) {
2205 goto error;
2206 }
2207
2208 kernel_wait_quiescent(kernel_tracer_fd);
2209 break;
2210 }
2211 case LTTNG_DOMAIN_UST:
2212 {
2213 struct ltt_ust_channel *uchan;
2214
2215 chan_ht = usess->domain_global.channels;
2216
2217 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2218 if (uchan == NULL) {
2219 ret = channel_ust_create(usess, domain, attr);
2220 } else {
2221 ret = channel_ust_enable(usess, domain, uchan);
2222 }
2223 break;
2224 }
2225 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2226 case LTTNG_DOMAIN_UST_EXEC_NAME:
2227 case LTTNG_DOMAIN_UST_PID:
2228 ret = LTTCOMM_NOT_IMPLEMENTED;
2229 goto error;
2230 default:
2231 ret = LTTCOMM_UNKNOWN_DOMAIN;
2232 goto error;
2233 }
2234
2235 error:
2236 return ret;
2237 }
2238
2239 /*
2240 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2241 */
2242 static int cmd_disable_event(struct ltt_session *session, int domain,
2243 char *channel_name, char *event_name)
2244 {
2245 int ret;
2246
2247 switch (domain) {
2248 case LTTNG_DOMAIN_KERNEL:
2249 {
2250 struct ltt_kernel_channel *kchan;
2251 struct ltt_kernel_session *ksess;
2252
2253 ksess = session->kernel_session;
2254
2255 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2256 if (kchan == NULL) {
2257 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2258 goto error;
2259 }
2260
2261 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2262 if (ret != LTTCOMM_OK) {
2263 goto error;
2264 }
2265
2266 kernel_wait_quiescent(kernel_tracer_fd);
2267 break;
2268 }
2269 case LTTNG_DOMAIN_UST:
2270 {
2271 struct ltt_ust_channel *uchan;
2272 struct ltt_ust_session *usess;
2273
2274 usess = session->ust_session;
2275
2276 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2277 channel_name);
2278 if (uchan == NULL) {
2279 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2280 goto error;
2281 }
2282
2283 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2284 if (ret != LTTCOMM_OK) {
2285 goto error;
2286 }
2287
2288 DBG3("Disable UST event %s in channel %s completed", event_name,
2289 channel_name);
2290 break;
2291 }
2292 case LTTNG_DOMAIN_UST_EXEC_NAME:
2293 case LTTNG_DOMAIN_UST_PID:
2294 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2295 default:
2296 ret = LTTCOMM_NOT_IMPLEMENTED;
2297 goto error;
2298 }
2299
2300 ret = LTTCOMM_OK;
2301
2302 error:
2303 return ret;
2304 }
2305
2306 /*
2307 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2308 */
2309 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2310 char *channel_name)
2311 {
2312 int ret;
2313
2314 switch (domain) {
2315 case LTTNG_DOMAIN_KERNEL:
2316 {
2317 struct ltt_kernel_session *ksess;
2318 struct ltt_kernel_channel *kchan;
2319
2320 ksess = session->kernel_session;
2321
2322 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2323 if (kchan == NULL) {
2324 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2325 goto error;
2326 }
2327
2328 ret = event_kernel_disable_all(ksess, kchan);
2329 if (ret != LTTCOMM_OK) {
2330 goto error;
2331 }
2332
2333 kernel_wait_quiescent(kernel_tracer_fd);
2334 break;
2335 }
2336 case LTTNG_DOMAIN_UST:
2337 {
2338 struct ltt_ust_session *usess;
2339 struct ltt_ust_channel *uchan;
2340
2341 usess = session->ust_session;
2342
2343 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2344 channel_name);
2345 if (uchan == NULL) {
2346 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2347 goto error;
2348 }
2349
2350 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2351 if (ret != 0) {
2352 goto error;
2353 }
2354
2355 DBG3("Disable all UST events in channel %s completed", channel_name);
2356
2357 break;
2358 }
2359 case LTTNG_DOMAIN_UST_EXEC_NAME:
2360 case LTTNG_DOMAIN_UST_PID:
2361 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2362 default:
2363 ret = LTTCOMM_NOT_IMPLEMENTED;
2364 goto error;
2365 }
2366
2367 ret = LTTCOMM_OK;
2368
2369 error:
2370 return ret;
2371 }
2372
2373 /*
2374 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2375 */
2376 static int cmd_add_context(struct ltt_session *session, int domain,
2377 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2378 {
2379 int ret;
2380
2381 switch (domain) {
2382 case LTTNG_DOMAIN_KERNEL:
2383 /* Add kernel context to kernel tracer */
2384 ret = context_kernel_add(session->kernel_session, ctx,
2385 event_name, channel_name);
2386 if (ret != LTTCOMM_OK) {
2387 goto error;
2388 }
2389 break;
2390 case LTTNG_DOMAIN_UST:
2391 {
2392 struct ltt_ust_session *usess = session->ust_session;
2393
2394 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2395 if (ret != LTTCOMM_OK) {
2396 goto error;
2397 }
2398 break;
2399 }
2400 case LTTNG_DOMAIN_UST_EXEC_NAME:
2401 case LTTNG_DOMAIN_UST_PID:
2402 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2403 default:
2404 ret = LTTCOMM_NOT_IMPLEMENTED;
2405 goto error;
2406 }
2407
2408 ret = LTTCOMM_OK;
2409
2410 error:
2411 return ret;
2412 }
2413
2414 /*
2415 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2416 *
2417 * TODO: currently, both events and loglevels are kept within the same
2418 * namespace for UST global registry/app registery, so if an event
2419 * happen to have the same name as the loglevel (very unlikely though),
2420 * and an attempt is made to enable/disable both in the same session,
2421 * the first to be created will be the only one allowed to exist.
2422 */
2423 static int cmd_enable_event(struct ltt_session *session, int domain,
2424 char *channel_name, struct lttng_event *event)
2425 {
2426 int ret;
2427 struct lttng_channel *attr;
2428 struct ltt_ust_session *usess = session->ust_session;
2429
2430 switch (domain) {
2431 case LTTNG_DOMAIN_KERNEL:
2432 {
2433 struct ltt_kernel_channel *kchan;
2434
2435 kchan = trace_kernel_get_channel_by_name(channel_name,
2436 session->kernel_session);
2437 if (kchan == NULL) {
2438 attr = channel_new_default_attr(domain);
2439 if (attr == NULL) {
2440 ret = LTTCOMM_FATAL;
2441 goto error;
2442 }
2443 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2444
2445 /* This call will notify the kernel thread */
2446 ret = channel_kernel_create(session->kernel_session,
2447 attr, kernel_poll_pipe[1]);
2448 if (ret != LTTCOMM_OK) {
2449 free(attr);
2450 goto error;
2451 }
2452 free(attr);
2453 }
2454
2455 /* Get the newly created kernel channel pointer */
2456 kchan = trace_kernel_get_channel_by_name(channel_name,
2457 session->kernel_session);
2458 if (kchan == NULL) {
2459 /* This sould not happen... */
2460 ret = LTTCOMM_FATAL;
2461 goto error;
2462 }
2463
2464 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2465 event);
2466 if (ret != LTTCOMM_OK) {
2467 goto error;
2468 }
2469
2470 kernel_wait_quiescent(kernel_tracer_fd);
2471 break;
2472 }
2473 case LTTNG_DOMAIN_UST:
2474 {
2475 struct lttng_channel *attr;
2476 struct ltt_ust_channel *uchan;
2477
2478 /* Get channel from global UST domain */
2479 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2480 channel_name);
2481 if (uchan == NULL) {
2482 /* Create default channel */
2483 attr = channel_new_default_attr(domain);
2484 if (attr == NULL) {
2485 ret = LTTCOMM_FATAL;
2486 goto error;
2487 }
2488 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2489 attr->name[NAME_MAX - 1] = '\0';
2490
2491 ret = channel_ust_create(usess, domain, attr);
2492 if (ret != LTTCOMM_OK) {
2493 free(attr);
2494 goto error;
2495 }
2496 free(attr);
2497
2498 /* Get the newly created channel reference back */
2499 uchan = trace_ust_find_channel_by_name(
2500 usess->domain_global.channels, channel_name);
2501 if (uchan == NULL) {
2502 /* Something is really wrong */
2503 ret = LTTCOMM_FATAL;
2504 goto error;
2505 }
2506 }
2507
2508 /* At this point, the session and channel exist on the tracer */
2509 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2510 if (ret != LTTCOMM_OK) {
2511 goto error;
2512 }
2513 break;
2514 }
2515 case LTTNG_DOMAIN_UST_EXEC_NAME:
2516 case LTTNG_DOMAIN_UST_PID:
2517 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2518 default:
2519 ret = LTTCOMM_NOT_IMPLEMENTED;
2520 goto error;
2521 }
2522
2523 ret = LTTCOMM_OK;
2524
2525 error:
2526 return ret;
2527 }
2528
2529 /*
2530 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2531 */
2532 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2533 char *channel_name, int event_type)
2534 {
2535 int ret;
2536 struct ltt_kernel_channel *kchan;
2537
2538 switch (domain) {
2539 case LTTNG_DOMAIN_KERNEL:
2540 kchan = trace_kernel_get_channel_by_name(channel_name,
2541 session->kernel_session);
2542 if (kchan == NULL) {
2543 /* This call will notify the kernel thread */
2544 ret = channel_kernel_create(session->kernel_session, NULL,
2545 kernel_poll_pipe[1]);
2546 if (ret != LTTCOMM_OK) {
2547 goto error;
2548 }
2549
2550 /* Get the newly created kernel channel pointer */
2551 kchan = trace_kernel_get_channel_by_name(channel_name,
2552 session->kernel_session);
2553 if (kchan == NULL) {
2554 /* This sould not happen... */
2555 ret = LTTCOMM_FATAL;
2556 goto error;
2557 }
2558
2559 }
2560
2561 switch (event_type) {
2562 case LTTNG_EVENT_SYSCALL:
2563 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2564 kchan, kernel_tracer_fd);
2565 break;
2566 case LTTNG_EVENT_TRACEPOINT:
2567 /*
2568 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2569 * events already registered to the channel.
2570 */
2571 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2572 kchan, kernel_tracer_fd);
2573 break;
2574 case LTTNG_EVENT_ALL:
2575 /* Enable syscalls and tracepoints */
2576 ret = event_kernel_enable_all(session->kernel_session,
2577 kchan, kernel_tracer_fd);
2578 break;
2579 default:
2580 ret = LTTCOMM_KERN_ENABLE_FAIL;
2581 goto error;
2582 }
2583
2584 /* Manage return value */
2585 if (ret != LTTCOMM_OK) {
2586 goto error;
2587 }
2588
2589 kernel_wait_quiescent(kernel_tracer_fd);
2590 break;
2591 case LTTNG_DOMAIN_UST:
2592 {
2593 struct lttng_channel *attr;
2594 struct ltt_ust_channel *uchan;
2595 struct ltt_ust_session *usess = session->ust_session;
2596
2597 /* Get channel from global UST domain */
2598 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2599 channel_name);
2600 if (uchan == NULL) {
2601 /* Create default channel */
2602 attr = channel_new_default_attr(domain);
2603 if (attr == NULL) {
2604 ret = LTTCOMM_FATAL;
2605 goto error;
2606 }
2607 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2608 attr->name[NAME_MAX - 1] = '\0';
2609
2610 /* Use the internal command enable channel */
2611 ret = channel_ust_create(usess, domain, attr);
2612 if (ret != LTTCOMM_OK) {
2613 free(attr);
2614 goto error;
2615 }
2616 free(attr);
2617
2618 /* Get the newly created channel reference back */
2619 uchan = trace_ust_find_channel_by_name(
2620 usess->domain_global.channels, channel_name);
2621 if (uchan == NULL) {
2622 /* Something is really wrong */
2623 ret = LTTCOMM_FATAL;
2624 goto error;
2625 }
2626 }
2627
2628 /* At this point, the session and channel exist on the tracer */
2629
2630 switch (event_type) {
2631 case LTTNG_EVENT_ALL:
2632 case LTTNG_EVENT_TRACEPOINT:
2633 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2634 if (ret != LTTCOMM_OK) {
2635 goto error;
2636 }
2637 break;
2638 default:
2639 ret = LTTCOMM_UST_ENABLE_FAIL;
2640 goto error;
2641 }
2642
2643 /* Manage return value */
2644 if (ret != LTTCOMM_OK) {
2645 goto error;
2646 }
2647
2648 break;
2649 }
2650 case LTTNG_DOMAIN_UST_EXEC_NAME:
2651 case LTTNG_DOMAIN_UST_PID:
2652 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2653 default:
2654 ret = LTTCOMM_NOT_IMPLEMENTED;
2655 goto error;
2656 }
2657
2658 ret = LTTCOMM_OK;
2659
2660 error:
2661 return ret;
2662 }
2663
2664 /*
2665 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2666 */
2667 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2668 {
2669 int ret;
2670 ssize_t nb_events = 0;
2671
2672 switch (domain) {
2673 case LTTNG_DOMAIN_KERNEL:
2674 nb_events = kernel_list_events(kernel_tracer_fd, events);
2675 if (nb_events < 0) {
2676 ret = LTTCOMM_KERN_LIST_FAIL;
2677 goto error;
2678 }
2679 break;
2680 case LTTNG_DOMAIN_UST:
2681 nb_events = ust_app_list_events(events);
2682 if (nb_events < 0) {
2683 ret = LTTCOMM_UST_LIST_FAIL;
2684 goto error;
2685 }
2686 break;
2687 default:
2688 ret = LTTCOMM_NOT_IMPLEMENTED;
2689 goto error;
2690 }
2691
2692 return nb_events;
2693
2694 error:
2695 /* Return negative value to differentiate return code */
2696 return -ret;
2697 }
2698
2699 /*
2700 * Command LTTNG_START_TRACE processed by the client thread.
2701 */
2702 static int cmd_start_trace(struct ltt_session *session)
2703 {
2704 int ret;
2705 struct ltt_kernel_session *ksession;
2706 struct ltt_ust_session *usess;
2707
2708 /* Short cut */
2709 ksession = session->kernel_session;
2710 usess = session->ust_session;
2711
2712 if (session->enabled) {
2713 ret = LTTCOMM_UST_START_FAIL;
2714 goto error;
2715 }
2716
2717 session->enabled = 1;
2718
2719 /* Kernel tracing */
2720 if (ksession != NULL) {
2721 struct ltt_kernel_channel *kchan;
2722
2723 /* Open kernel metadata */
2724 if (ksession->metadata == NULL) {
2725 ret = kernel_open_metadata(ksession, ksession->trace_path);
2726 if (ret < 0) {
2727 ret = LTTCOMM_KERN_META_FAIL;
2728 goto error;
2729 }
2730 }
2731
2732 /* Open kernel metadata stream */
2733 if (ksession->metadata_stream_fd == 0) {
2734 ret = kernel_open_metadata_stream(ksession);
2735 if (ret < 0) {
2736 ERR("Kernel create metadata stream failed");
2737 ret = LTTCOMM_KERN_STREAM_FAIL;
2738 goto error;
2739 }
2740 }
2741
2742 /* For each channel */
2743 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2744 if (kchan->stream_count == 0) {
2745 ret = kernel_open_channel_stream(kchan);
2746 if (ret < 0) {
2747 ret = LTTCOMM_KERN_STREAM_FAIL;
2748 goto error;
2749 }
2750 /* Update the stream global counter */
2751 ksession->stream_count_global += ret;
2752 }
2753 }
2754
2755 /* Setup kernel consumer socket and send fds to it */
2756 ret = init_kernel_tracing(ksession);
2757 if (ret < 0) {
2758 ret = LTTCOMM_KERN_START_FAIL;
2759 goto error;
2760 }
2761
2762 /* This start the kernel tracing */
2763 ret = kernel_start_session(ksession);
2764 if (ret < 0) {
2765 ret = LTTCOMM_KERN_START_FAIL;
2766 goto error;
2767 }
2768
2769 /* Quiescent wait after starting trace */
2770 kernel_wait_quiescent(kernel_tracer_fd);
2771 }
2772
2773 /* Flag session that trace should start automatically */
2774 if (usess) {
2775 usess->start_trace = 1;
2776
2777 ret = ust_app_start_trace_all(usess);
2778 if (ret < 0) {
2779 ret = LTTCOMM_UST_START_FAIL;
2780 goto error;
2781 }
2782 }
2783
2784 ret = LTTCOMM_OK;
2785
2786 error:
2787 return ret;
2788 }
2789
2790 /*
2791 * Command LTTNG_STOP_TRACE processed by the client thread.
2792 */
2793 static int cmd_stop_trace(struct ltt_session *session)
2794 {
2795 int ret;
2796 struct ltt_kernel_channel *kchan;
2797 struct ltt_kernel_session *ksession;
2798 struct ltt_ust_session *usess;
2799
2800 /* Short cut */
2801 ksession = session->kernel_session;
2802 usess = session->ust_session;
2803
2804 if (!session->enabled) {
2805 ret = LTTCOMM_UST_STOP_FAIL;
2806 goto error;
2807 }
2808
2809 session->enabled = 0;
2810
2811 /* Kernel tracer */
2812 if (ksession != NULL) {
2813 DBG("Stop kernel tracing");
2814
2815 /* Flush all buffers before stopping */
2816 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2817 if (ret < 0) {
2818 ERR("Kernel metadata flush failed");
2819 }
2820
2821 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2822 ret = kernel_flush_buffer(kchan);
2823 if (ret < 0) {
2824 ERR("Kernel flush buffer error");
2825 }
2826 }
2827
2828 ret = kernel_stop_session(ksession);
2829 if (ret < 0) {
2830 ret = LTTCOMM_KERN_STOP_FAIL;
2831 goto error;
2832 }
2833
2834 kernel_wait_quiescent(kernel_tracer_fd);
2835 }
2836
2837 if (usess) {
2838 usess->start_trace = 0;
2839
2840 ret = ust_app_stop_trace_all(usess);
2841 if (ret < 0) {
2842 ret = LTTCOMM_UST_STOP_FAIL;
2843 goto error;
2844 }
2845 }
2846
2847 ret = LTTCOMM_OK;
2848
2849 error:
2850 return ret;
2851 }
2852
2853 /*
2854 * Command LTTNG_CREATE_SESSION processed by the client thread.
2855 */
2856 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2857 {
2858 int ret;
2859
2860 ret = session_create(name, path, creds->uid, creds->gid);
2861 if (ret != LTTCOMM_OK) {
2862 goto error;
2863 }
2864
2865 ret = LTTCOMM_OK;
2866
2867 error:
2868 return ret;
2869 }
2870
2871 /*
2872 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2873 */
2874 static int cmd_destroy_session(struct ltt_session *session, char *name)
2875 {
2876 int ret;
2877
2878 /* Clean kernel session teardown */
2879 teardown_kernel_session(session);
2880 /* UST session teardown */
2881 teardown_ust_session(session);
2882
2883 /*
2884 * Must notify the kernel thread here to update it's poll setin order
2885 * to remove the channel(s)' fd just destroyed.
2886 */
2887 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2888 if (ret < 0) {
2889 perror("write kernel poll pipe");
2890 }
2891
2892 ret = session_destroy(session);
2893
2894 return ret;
2895 }
2896
2897 /*
2898 * Command LTTNG_CALIBRATE processed by the client thread.
2899 */
2900 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2901 {
2902 int ret;
2903
2904 switch (domain) {
2905 case LTTNG_DOMAIN_KERNEL:
2906 {
2907 struct lttng_kernel_calibrate kcalibrate;
2908
2909 kcalibrate.type = calibrate->type;
2910 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2911 if (ret < 0) {
2912 ret = LTTCOMM_KERN_ENABLE_FAIL;
2913 goto error;
2914 }
2915 break;
2916 }
2917 default:
2918 /* TODO: Userspace tracing */
2919 ret = LTTCOMM_NOT_IMPLEMENTED;
2920 goto error;
2921 }
2922
2923 ret = LTTCOMM_OK;
2924
2925 error:
2926 return ret;
2927 }
2928
2929 /*
2930 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2931 */
2932 static int cmd_register_consumer(struct ltt_session *session, int domain,
2933 char *sock_path)
2934 {
2935 int ret, sock;
2936
2937 switch (domain) {
2938 case LTTNG_DOMAIN_KERNEL:
2939 /* Can't register a consumer if there is already one */
2940 if (session->kernel_session->consumer_fds_sent != 0) {
2941 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2942 goto error;
2943 }
2944
2945 sock = lttcomm_connect_unix_sock(sock_path);
2946 if (sock < 0) {
2947 ret = LTTCOMM_CONNECT_FAIL;
2948 goto error;
2949 }
2950
2951 session->kernel_session->consumer_fd = sock;
2952 break;
2953 default:
2954 /* TODO: Userspace tracing */
2955 ret = LTTCOMM_NOT_IMPLEMENTED;
2956 goto error;
2957 }
2958
2959 ret = LTTCOMM_OK;
2960
2961 error:
2962 return ret;
2963 }
2964
2965 /*
2966 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2967 */
2968 static ssize_t cmd_list_domains(struct ltt_session *session,
2969 struct lttng_domain **domains)
2970 {
2971 int ret, index = 0;
2972 ssize_t nb_dom = 0;
2973
2974 if (session->kernel_session != NULL) {
2975 DBG3("Listing domains found kernel domain");
2976 nb_dom++;
2977 }
2978
2979 if (session->ust_session != NULL) {
2980 DBG3("Listing domains found UST global domain");
2981 nb_dom++;
2982 }
2983
2984 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2985 if (*domains == NULL) {
2986 ret = -LTTCOMM_FATAL;
2987 goto error;
2988 }
2989
2990 if (session->kernel_session != NULL) {
2991 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
2992 index++;
2993 }
2994
2995 if (session->ust_session != NULL) {
2996 (*domains)[index].type = LTTNG_DOMAIN_UST;
2997 index++;
2998 }
2999
3000 return nb_dom;
3001
3002 error:
3003 return ret;
3004 }
3005
3006 /*
3007 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3008 */
3009 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3010 struct lttng_channel **channels)
3011 {
3012 int ret;
3013 ssize_t nb_chan = 0;
3014
3015 switch (domain) {
3016 case LTTNG_DOMAIN_KERNEL:
3017 if (session->kernel_session != NULL) {
3018 nb_chan = session->kernel_session->channel_count;
3019 }
3020 DBG3("Number of kernel channels %zd", nb_chan);
3021 break;
3022 case LTTNG_DOMAIN_UST:
3023 if (session->ust_session != NULL) {
3024 nb_chan = lttng_ht_get_count(
3025 session->ust_session->domain_global.channels);
3026 }
3027 DBG3("Number of UST global channels %zd", nb_chan);
3028 break;
3029 default:
3030 *channels = NULL;
3031 ret = -LTTCOMM_NOT_IMPLEMENTED;
3032 goto error;
3033 }
3034
3035 if (nb_chan > 0) {
3036 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3037 if (*channels == NULL) {
3038 ret = -LTTCOMM_FATAL;
3039 goto error;
3040 }
3041
3042 list_lttng_channels(domain, session, *channels);
3043 } else {
3044 *channels = NULL;
3045 }
3046
3047 return nb_chan;
3048
3049 error:
3050 return ret;
3051 }
3052
3053 /*
3054 * Command LTTNG_LIST_EVENTS processed by the client thread.
3055 */
3056 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3057 char *channel_name, struct lttng_event **events)
3058 {
3059 int ret = 0;
3060 ssize_t nb_event = 0;
3061
3062 switch (domain) {
3063 case LTTNG_DOMAIN_KERNEL:
3064 if (session->kernel_session != NULL) {
3065 nb_event = list_lttng_kernel_events(channel_name,
3066 session->kernel_session, events);
3067 }
3068 break;
3069 case LTTNG_DOMAIN_UST:
3070 {
3071 if (session->ust_session != NULL) {
3072 nb_event = list_lttng_ust_global_events(channel_name,
3073 &session->ust_session->domain_global, events);
3074 }
3075 break;
3076 }
3077 default:
3078 ret = -LTTCOMM_NOT_IMPLEMENTED;
3079 goto error;
3080 }
3081
3082 ret = nb_event;
3083
3084 error:
3085 return ret;
3086 }
3087
3088 /*
3089 * Process the command requested by the lttng client within the command
3090 * context structure. This function make sure that the return structure (llm)
3091 * is set and ready for transmission before returning.
3092 *
3093 * Return any error encountered or 0 for success.
3094 */
3095 static int process_client_msg(struct command_ctx *cmd_ctx)
3096 {
3097 int ret = LTTCOMM_OK;
3098 int need_tracing_session = 1;
3099
3100 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3101
3102 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3103 ret = LTTCOMM_KERN_NA;
3104 goto error;
3105 }
3106
3107 /*
3108 * Check for command that don't needs to allocate a returned payload. We do
3109 * this here so we don't have to make the call for no payload at each
3110 * command.
3111 */
3112 switch(cmd_ctx->lsm->cmd_type) {
3113 case LTTNG_LIST_SESSIONS:
3114 case LTTNG_LIST_TRACEPOINTS:
3115 case LTTNG_LIST_DOMAINS:
3116 case LTTNG_LIST_CHANNELS:
3117 case LTTNG_LIST_EVENTS:
3118 break;
3119 default:
3120 /* Setup lttng message with no payload */
3121 ret = setup_lttng_msg(cmd_ctx, 0);
3122 if (ret < 0) {
3123 /* This label does not try to unlock the session */
3124 goto init_setup_error;
3125 }
3126 }
3127
3128 /* Commands that DO NOT need a session. */
3129 switch (cmd_ctx->lsm->cmd_type) {
3130 case LTTNG_CALIBRATE:
3131 case LTTNG_CREATE_SESSION:
3132 case LTTNG_LIST_SESSIONS:
3133 case LTTNG_LIST_TRACEPOINTS:
3134 need_tracing_session = 0;
3135 break;
3136 default:
3137 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3138 session_lock_list();
3139 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3140 session_unlock_list();
3141 if (cmd_ctx->session == NULL) {
3142 if (cmd_ctx->lsm->session.name != NULL) {
3143 ret = LTTCOMM_SESS_NOT_FOUND;
3144 } else {
3145 /* If no session name specified */
3146 ret = LTTCOMM_SELECT_SESS;
3147 }
3148 goto error;
3149 } else {
3150 /* Acquire lock for the session */
3151 session_lock(cmd_ctx->session);
3152 }
3153 break;
3154 }
3155
3156 /*
3157 * Check domain type for specific "pre-action".
3158 */
3159 switch (cmd_ctx->lsm->domain.type) {
3160 case LTTNG_DOMAIN_KERNEL:
3161 if (!is_root) {
3162 ret = LTTCOMM_KERN_NA;
3163 goto error;
3164 }
3165
3166 /* Kernel tracer check */
3167 if (kernel_tracer_fd == 0) {
3168 /* Basically, load kernel tracer modules */
3169 ret = init_kernel_tracer();
3170 if (ret != 0) {
3171 goto error;
3172 }
3173 }
3174
3175 /* Need a session for kernel command */
3176 if (need_tracing_session) {
3177 if (cmd_ctx->session->kernel_session == NULL) {
3178 ret = create_kernel_session(cmd_ctx->session);
3179 if (ret < 0) {
3180 ret = LTTCOMM_KERN_SESS_FAIL;
3181 goto error;
3182 }
3183 }
3184
3185 /* Start the kernel consumer daemon */
3186 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3187 if (kconsumer_data.pid == 0 &&
3188 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3189 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3190 ret = start_consumerd(&kconsumer_data);
3191 if (ret < 0) {
3192 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3193 goto error;
3194 }
3195 } else {
3196 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3197 }
3198 }
3199 break;
3200 case LTTNG_DOMAIN_UST:
3201 {
3202 if (need_tracing_session) {
3203 if (cmd_ctx->session->ust_session == NULL) {
3204 ret = create_ust_session(cmd_ctx->session,
3205 &cmd_ctx->lsm->domain);
3206 if (ret != LTTCOMM_OK) {
3207 goto error;
3208 }
3209 }
3210 /* Start the UST consumer daemons */
3211 /* 64-bit */
3212 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3213 if (consumerd64_bin[0] != '\0' &&
3214 ustconsumer64_data.pid == 0 &&
3215 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3216 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3217 ret = start_consumerd(&ustconsumer64_data);
3218 if (ret < 0) {
3219 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3220 ust_consumerd64_fd = -EINVAL;
3221 goto error;
3222 }
3223
3224 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3225 } else {
3226 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3227 }
3228 /* 32-bit */
3229 if (consumerd32_bin[0] != '\0' &&
3230 ustconsumer32_data.pid == 0 &&
3231 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3232 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3233 ret = start_consumerd(&ustconsumer32_data);
3234 if (ret < 0) {
3235 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3236 ust_consumerd32_fd = -EINVAL;
3237 goto error;
3238 }
3239 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3240 } else {
3241 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3242 }
3243 }
3244 break;
3245 }
3246 default:
3247 break;
3248 }
3249
3250 /*
3251 * Check that the UID or GID match that of the tracing session.
3252 * The root user can interact with all sessions.
3253 */
3254 if (need_tracing_session) {
3255 if (!session_access_ok(cmd_ctx->session,
3256 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3257 ret = LTTCOMM_EPERM;
3258 goto error;
3259 }
3260 }
3261
3262 /* Process by command type */
3263 switch (cmd_ctx->lsm->cmd_type) {
3264 case LTTNG_ADD_CONTEXT:
3265 {
3266 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3267 cmd_ctx->lsm->u.context.channel_name,
3268 cmd_ctx->lsm->u.context.event_name,
3269 &cmd_ctx->lsm->u.context.ctx);
3270 break;
3271 }
3272 case LTTNG_DISABLE_CHANNEL:
3273 {
3274 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3275 cmd_ctx->lsm->u.disable.channel_name);
3276 break;
3277 }
3278 case LTTNG_DISABLE_EVENT:
3279 {
3280 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3281 cmd_ctx->lsm->u.disable.channel_name,
3282 cmd_ctx->lsm->u.disable.name);
3283 ret = LTTCOMM_OK;
3284 break;
3285 }
3286 case LTTNG_DISABLE_ALL_EVENT:
3287 {
3288 DBG("Disabling all events");
3289
3290 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3291 cmd_ctx->lsm->u.disable.channel_name);
3292 break;
3293 }
3294 case LTTNG_ENABLE_CHANNEL:
3295 {
3296 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3297 &cmd_ctx->lsm->u.channel.chan);
3298 break;
3299 }
3300 case LTTNG_ENABLE_EVENT:
3301 {
3302 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3303 cmd_ctx->lsm->u.enable.channel_name,
3304 &cmd_ctx->lsm->u.enable.event);
3305 break;
3306 }
3307 case LTTNG_ENABLE_ALL_EVENT:
3308 {
3309 DBG("Enabling all events");
3310
3311 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3312 cmd_ctx->lsm->u.enable.channel_name,
3313 cmd_ctx->lsm->u.enable.event.type);
3314 break;
3315 }
3316 case LTTNG_LIST_TRACEPOINTS:
3317 {
3318 struct lttng_event *events;
3319 ssize_t nb_events;
3320
3321 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3322 if (nb_events < 0) {
3323 ret = -nb_events;
3324 goto error;
3325 }
3326
3327 /*
3328 * Setup lttng message with payload size set to the event list size in
3329 * bytes and then copy list into the llm payload.
3330 */
3331 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3332 if (ret < 0) {
3333 free(events);
3334 goto setup_error;
3335 }
3336
3337 /* Copy event list into message payload */
3338 memcpy(cmd_ctx->llm->payload, events,
3339 sizeof(struct lttng_event) * nb_events);
3340
3341 free(events);
3342
3343 ret = LTTCOMM_OK;
3344 break;
3345 }
3346 case LTTNG_START_TRACE:
3347 {
3348 ret = cmd_start_trace(cmd_ctx->session);
3349 break;
3350 }
3351 case LTTNG_STOP_TRACE:
3352 {
3353 ret = cmd_stop_trace(cmd_ctx->session);
3354 break;
3355 }
3356 case LTTNG_CREATE_SESSION:
3357 {
3358 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3359 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3360 break;
3361 }
3362 case LTTNG_DESTROY_SESSION:
3363 {
3364 ret = cmd_destroy_session(cmd_ctx->session,
3365 cmd_ctx->lsm->session.name);
3366 break;
3367 }
3368 case LTTNG_LIST_DOMAINS:
3369 {
3370 ssize_t nb_dom;
3371 struct lttng_domain *domains;
3372
3373 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3374 if (nb_dom < 0) {
3375 ret = -nb_dom;
3376 goto error;
3377 }
3378
3379 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3380 if (ret < 0) {
3381 goto setup_error;
3382 }
3383
3384 /* Copy event list into message payload */
3385 memcpy(cmd_ctx->llm->payload, domains,
3386 nb_dom * sizeof(struct lttng_domain));
3387
3388 free(domains);
3389
3390 ret = LTTCOMM_OK;
3391 break;
3392 }
3393 case LTTNG_LIST_CHANNELS:
3394 {
3395 size_t nb_chan;
3396 struct lttng_channel *channels;
3397
3398 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3399 cmd_ctx->session, &channels);
3400 if (nb_chan < 0) {
3401 ret = -nb_chan;
3402 goto error;
3403 }
3404
3405 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3406 if (ret < 0) {
3407 goto setup_error;
3408 }
3409
3410 /* Copy event list into message payload */
3411 memcpy(cmd_ctx->llm->payload, channels,
3412 nb_chan * sizeof(struct lttng_channel));
3413
3414 free(channels);
3415
3416 ret = LTTCOMM_OK;
3417 break;
3418 }
3419 case LTTNG_LIST_EVENTS:
3420 {
3421 ssize_t nb_event;
3422 struct lttng_event *events = NULL;
3423
3424 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3425 cmd_ctx->lsm->u.list.channel_name, &events);
3426 if (nb_event < 0) {
3427 ret = -nb_event;
3428 goto error;
3429 }
3430
3431 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3432 if (ret < 0) {
3433 goto setup_error;
3434 }
3435
3436 /* Copy event list into message payload */
3437 memcpy(cmd_ctx->llm->payload, events,
3438 nb_event * sizeof(struct lttng_event));
3439
3440 free(events);
3441
3442 ret = LTTCOMM_OK;
3443 break;
3444 }
3445 case LTTNG_LIST_SESSIONS:
3446 {
3447 unsigned int nr_sessions;
3448
3449 session_lock_list();
3450 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3451 if (nr_sessions == 0) {
3452 ret = LTTCOMM_NO_SESSION;
3453 session_unlock_list();
3454 goto error;
3455 }
3456 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3457 if (ret < 0) {
3458 session_unlock_list();
3459 goto setup_error;
3460 }
3461
3462 /* Filled the session array */
3463 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3464 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3465
3466 session_unlock_list();
3467
3468 ret = LTTCOMM_OK;
3469 break;
3470 }
3471 case LTTNG_CALIBRATE:
3472 {
3473 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3474 &cmd_ctx->lsm->u.calibrate);
3475 break;
3476 }
3477 case LTTNG_REGISTER_CONSUMER:
3478 {
3479 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3480 cmd_ctx->lsm->u.reg.path);
3481 break;
3482 }
3483 default:
3484 ret = LTTCOMM_UND;
3485 break;
3486 }
3487
3488 error:
3489 if (cmd_ctx->llm == NULL) {
3490 DBG("Missing llm structure. Allocating one.");
3491 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3492 goto setup_error;
3493 }
3494 }
3495 /* Set return code */
3496 cmd_ctx->llm->ret_code = ret;
3497 setup_error:
3498 if (cmd_ctx->session) {
3499 session_unlock(cmd_ctx->session);
3500 }
3501 init_setup_error:
3502 return ret;
3503 }
3504
3505 /*
3506 * This thread manage all clients request using the unix client socket for
3507 * communication.
3508 */
3509 static void *thread_manage_clients(void *data)
3510 {
3511 int sock = 0, ret, i, pollfd;
3512 uint32_t revents, nb_fd;
3513 struct command_ctx *cmd_ctx = NULL;
3514 struct lttng_poll_event events;
3515
3516 DBG("[thread] Manage client started");
3517
3518 rcu_register_thread();
3519
3520 ret = lttcomm_listen_unix_sock(client_sock);
3521 if (ret < 0) {
3522 goto error;
3523 }
3524
3525 /*
3526 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3527 * more will be added to this poll set.
3528 */
3529 ret = create_thread_poll_set(&events, 2);
3530 if (ret < 0) {
3531 goto error;
3532 }
3533
3534 /* Add the application registration socket */
3535 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3536 if (ret < 0) {
3537 goto error;
3538 }
3539
3540 /*
3541 * Notify parent pid that we are ready to accept command for client side.
3542 */
3543 if (opt_sig_parent) {
3544 kill(ppid, SIGUSR1);
3545 }
3546
3547 while (1) {
3548 DBG("Accepting client command ...");
3549
3550 nb_fd = LTTNG_POLL_GETNB(&events);
3551
3552 /* Inifinite blocking call, waiting for transmission */
3553 ret = lttng_poll_wait(&events, -1);
3554 if (ret < 0) {
3555 goto error;
3556 }
3557
3558 for (i = 0; i < nb_fd; i++) {
3559 /* Fetch once the poll data */
3560 revents = LTTNG_POLL_GETEV(&events, i);
3561 pollfd = LTTNG_POLL_GETFD(&events, i);
3562
3563 /* Thread quit pipe has been closed. Killing thread. */
3564 ret = check_thread_quit_pipe(pollfd, revents);
3565 if (ret) {
3566 goto error;
3567 }
3568
3569 /* Event on the registration socket */
3570 if (pollfd == client_sock) {
3571 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3572 ERR("Client socket poll error");
3573 goto error;
3574 }
3575 }
3576 }
3577
3578 DBG("Wait for client response");
3579
3580 sock = lttcomm_accept_unix_sock(client_sock);
3581 if (sock < 0) {
3582 goto error;
3583 }
3584
3585 /* Set socket option for credentials retrieval */
3586 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3587 if (ret < 0) {
3588 goto error;
3589 }
3590
3591 /* Allocate context command to process the client request */
3592 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3593 if (cmd_ctx == NULL) {
3594 perror("zmalloc cmd_ctx");
3595 goto error;
3596 }
3597
3598 /* Allocate data buffer for reception */
3599 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3600 if (cmd_ctx->lsm == NULL) {
3601 perror("zmalloc cmd_ctx->lsm");
3602 goto error;
3603 }
3604
3605 cmd_ctx->llm = NULL;
3606 cmd_ctx->session = NULL;
3607
3608 /*
3609 * Data is received from the lttng client. The struct
3610 * lttcomm_session_msg (lsm) contains the command and data request of
3611 * the client.
3612 */
3613 DBG("Receiving data from client ...");
3614 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3615 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3616 if (ret <= 0) {
3617 DBG("Nothing recv() from client... continuing");
3618 close(sock);
3619 free(cmd_ctx);
3620 continue;
3621 }
3622
3623 // TODO: Validate cmd_ctx including sanity check for
3624 // security purpose.
3625
3626 rcu_thread_online();
3627 /*
3628 * This function dispatch the work to the kernel or userspace tracer
3629 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3630 * informations for the client. The command context struct contains
3631 * everything this function may needs.
3632 */
3633 ret = process_client_msg(cmd_ctx);
3634 rcu_thread_offline();
3635 if (ret < 0) {
3636 /*
3637 * TODO: Inform client somehow of the fatal error. At
3638 * this point, ret < 0 means that a zmalloc failed
3639 * (ENOMEM). Error detected but still accept command.
3640 */
3641 clean_command_ctx(&cmd_ctx);
3642 continue;
3643 }
3644
3645 DBG("Sending response (size: %d, retcode: %s)",
3646 cmd_ctx->lttng_msg_size,
3647 lttng_strerror(-cmd_ctx->llm->ret_code));
3648 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3649 if (ret < 0) {
3650 ERR("Failed to send data back to client");
3651 }
3652
3653 /* End of transmission */
3654 close(sock);
3655
3656 clean_command_ctx(&cmd_ctx);
3657 }
3658
3659 error:
3660 DBG("Client thread dying");
3661 unlink(client_unix_sock_path);
3662 close(client_sock);
3663 close(sock);
3664
3665 lttng_poll_clean(&events);
3666 clean_command_ctx(&cmd_ctx);
3667
3668 rcu_unregister_thread();
3669 return NULL;
3670 }
3671
3672
3673 /*
3674 * usage function on stderr
3675 */
3676 static void usage(void)
3677 {
3678 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3679 fprintf(stderr, " -h, --help Display this usage.\n");
3680 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3681 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3682 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3683 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3684 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3685 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3686 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3687 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3688 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3689 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3690 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3691 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3692 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3693 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3694 fprintf(stderr, " -V, --version Show version number.\n");
3695 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3696 fprintf(stderr, " -q, --quiet No output at all.\n");
3697 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3698 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3699 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3700 }
3701
3702 /*
3703 * daemon argument parsing
3704 */
3705 static int parse_args(int argc, char **argv)
3706 {
3707 int c;
3708
3709 static struct option long_options[] = {
3710 { "client-sock", 1, 0, 'c' },
3711 { "apps-sock", 1, 0, 'a' },
3712 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3713 { "kconsumerd-err-sock", 1, 0, 'E' },
3714 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3715 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3716 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3717 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3718 { "consumerd32-path", 1, 0, 'u' },
3719 { "consumerd32-libdir", 1, 0, 'U' },
3720 { "consumerd64-path", 1, 0, 't' },
3721 { "consumerd64-libdir", 1, 0, 'T' },
3722 { "daemonize", 0, 0, 'd' },
3723 { "sig-parent", 0, 0, 'S' },
3724 { "help", 0, 0, 'h' },
3725 { "group", 1, 0, 'g' },
3726 { "version", 0, 0, 'V' },
3727 { "quiet", 0, 0, 'q' },
3728 { "verbose", 0, 0, 'v' },
3729 { "verbose-consumer", 0, 0, 'Z' },
3730 { "no-kernel", 0, 0, 'N' },
3731 { NULL, 0, 0, 0 }
3732 };
3733
3734 while (1) {
3735 int option_index = 0;
3736 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3737 long_options, &option_index);
3738 if (c == -1) {
3739 break;
3740 }
3741
3742 switch (c) {
3743 case 0:
3744 fprintf(stderr, "option %s", long_options[option_index].name);
3745 if (optarg) {
3746 fprintf(stderr, " with arg %s\n", optarg);
3747 }
3748 break;
3749 case 'c':
3750 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3751 break;
3752 case 'a':
3753 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3754 break;
3755 case 'd':
3756 opt_daemon = 1;
3757 break;
3758 case 'g':
3759 opt_tracing_group = optarg;
3760 break;
3761 case 'h':
3762 usage();
3763 exit(EXIT_FAILURE);
3764 case 'V':
3765 fprintf(stdout, "%s\n", VERSION);
3766 exit(EXIT_SUCCESS);
3767 case 'S':
3768 opt_sig_parent = 1;
3769 break;
3770 case 'E':
3771 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3772 break;
3773 case 'C':
3774 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3775 break;
3776 case 'F':
3777 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3778 break;
3779 case 'D':
3780 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3781 break;
3782 case 'H':
3783 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3784 break;
3785 case 'G':
3786 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3787 break;
3788 case 'N':
3789 opt_no_kernel = 1;
3790 break;
3791 case 'q':
3792 opt_quiet = 1;
3793 break;
3794 case 'v':
3795 /* Verbose level can increase using multiple -v */
3796 opt_verbose += 1;
3797 break;
3798 case 'Z':
3799 opt_verbose_consumer += 1;
3800 break;
3801 case 'u':
3802 consumerd32_bin= optarg;
3803 break;
3804 case 'U':
3805 consumerd32_libdir = optarg;
3806 break;
3807 case 't':
3808 consumerd64_bin = optarg;
3809 break;
3810 case 'T':
3811 consumerd64_libdir = optarg;
3812 break;
3813 default:
3814 /* Unknown option or other error.
3815 * Error is printed by getopt, just return */
3816 return -1;
3817 }
3818 }
3819
3820 return 0;
3821 }
3822
3823 /*
3824 * Creates the two needed socket by the daemon.
3825 * apps_sock - The communication socket for all UST apps.
3826 * client_sock - The communication of the cli tool (lttng).
3827 */
3828 static int init_daemon_socket(void)
3829 {
3830 int ret = 0;
3831 mode_t old_umask;
3832
3833 old_umask = umask(0);
3834
3835 /* Create client tool unix socket */
3836 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3837 if (client_sock < 0) {
3838 ERR("Create unix sock failed: %s", client_unix_sock_path);
3839 ret = -1;
3840 goto end;
3841 }
3842
3843 /* File permission MUST be 660 */
3844 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3845 if (ret < 0) {
3846 ERR("Set file permissions failed: %s", client_unix_sock_path);
3847 perror("chmod");
3848 goto end;
3849 }
3850
3851 /* Create the application unix socket */
3852 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3853 if (apps_sock < 0) {
3854 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3855 ret = -1;
3856 goto end;
3857 }
3858
3859 /* File permission MUST be 666 */
3860 ret = chmod(apps_unix_sock_path,
3861 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3862 if (ret < 0) {
3863 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3864 perror("chmod");
3865 goto end;
3866 }
3867
3868 end:
3869 umask(old_umask);
3870 return ret;
3871 }
3872
3873 /*
3874 * Check if the global socket is available, and if a daemon is answering at the
3875 * other side. If yes, error is returned.
3876 */
3877 static int check_existing_daemon(void)
3878 {
3879 if (access(client_unix_sock_path, F_OK) < 0 &&
3880 access(apps_unix_sock_path, F_OK) < 0) {
3881 return 0;
3882 }
3883
3884 /* Is there anybody out there ? */
3885 if (lttng_session_daemon_alive()) {
3886 return -EEXIST;
3887 } else {
3888 return 0;
3889 }
3890 }
3891
3892 /*
3893 * Set the tracing group gid onto the client socket.
3894 *
3895 * Race window between mkdir and chown is OK because we are going from more
3896 * permissive (root.root) to les permissive (root.tracing).
3897 */
3898 static int set_permissions(char *rundir)
3899 {
3900 int ret;
3901 gid_t gid;
3902
3903 gid = allowed_group();
3904 if (gid < 0) {
3905 WARN("No tracing group detected");
3906 ret = 0;
3907 goto end;
3908 }
3909
3910 /* Set lttng run dir */
3911 ret = chown(rundir, 0, gid);
3912 if (ret < 0) {
3913 ERR("Unable to set group on %s", rundir);
3914 perror("chown");
3915 }
3916
3917 /* lttng client socket path */
3918 ret = chown(client_unix_sock_path, 0, gid);
3919 if (ret < 0) {
3920 ERR("Unable to set group on %s", client_unix_sock_path);
3921 perror("chown");
3922 }
3923
3924 /* kconsumer error socket path */
3925 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3926 if (ret < 0) {
3927 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3928 perror("chown");
3929 }
3930
3931 /* 64-bit ustconsumer error socket path */
3932 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3933 if (ret < 0) {
3934 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3935 perror("chown");
3936 }
3937
3938 /* 32-bit ustconsumer compat32 error socket path */
3939 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3940 if (ret < 0) {
3941 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3942 perror("chown");
3943 }
3944
3945 DBG("All permissions are set");
3946
3947 end:
3948 return ret;
3949 }
3950
3951 /*
3952 * Create the pipe used to wake up the kernel thread.
3953 */
3954 static int create_kernel_poll_pipe(void)
3955 {
3956 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3957 }
3958
3959 /*
3960 * Create the application command pipe to wake thread_manage_apps.
3961 */
3962 static int create_apps_cmd_pipe(void)
3963 {
3964 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3965 }
3966
3967 /*
3968 * Create the lttng run directory needed for all global sockets and pipe.
3969 */
3970 static int create_lttng_rundir(const char *rundir)
3971 {
3972 int ret;
3973
3974 DBG3("Creating LTTng run directory: %s", rundir);
3975
3976 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
3977 if (ret < 0) {
3978 if (errno != EEXIST) {
3979 ERR("Unable to create %s", rundir);
3980 goto error;
3981 } else {
3982 ret = 0;
3983 }
3984 }
3985
3986 error:
3987 return ret;
3988 }
3989
3990 /*
3991 * Setup sockets and directory needed by the kconsumerd communication with the
3992 * session daemon.
3993 */
3994 static int set_consumer_sockets(struct consumer_data *consumer_data,
3995 const char *rundir)
3996 {
3997 int ret;
3998 char path[PATH_MAX];
3999
4000 switch (consumer_data->type) {
4001 case LTTNG_CONSUMER_KERNEL:
4002 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4003 break;
4004 case LTTNG_CONSUMER64_UST:
4005 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4006 break;
4007 case LTTNG_CONSUMER32_UST:
4008 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4009 break;
4010 default:
4011 ERR("Consumer type unknown");
4012 ret = -EINVAL;
4013 goto error;
4014 }
4015
4016 DBG2("Creating consumer directory: %s", path);
4017
4018 ret = mkdir(path, S_IRWXU | S_IRWXG);
4019 if (ret < 0) {
4020 if (errno != EEXIST) {
4021 ERR("Failed to create %s", path);
4022 goto error;
4023 }
4024 ret = 0;
4025 }
4026
4027 /* Create the kconsumerd error unix socket */
4028 consumer_data->err_sock =
4029 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4030 if (consumer_data->err_sock < 0) {
4031 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4032 ret = -1;
4033 goto error;
4034 }
4035
4036 /* File permission MUST be 660 */
4037 ret = chmod(consumer_data->err_unix_sock_path,
4038 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4039 if (ret < 0) {
4040 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4041 PERROR("chmod");
4042 goto error;
4043 }
4044
4045 error:
4046 return ret;
4047 }
4048
4049 /*
4050 * Signal handler for the daemon
4051 *
4052 * Simply stop all worker threads, leaving main() return gracefully after
4053 * joining all threads and calling cleanup().
4054 */
4055 static void sighandler(int sig)
4056 {
4057 switch (sig) {
4058 case SIGPIPE:
4059 DBG("SIGPIPE caugth");
4060 return;
4061 case SIGINT:
4062 DBG("SIGINT caugth");
4063 stop_threads();
4064 break;
4065 case SIGTERM:
4066 DBG("SIGTERM caugth");
4067 stop_threads();
4068 break;
4069 default:
4070 break;
4071 }
4072 }
4073
4074 /*
4075 * Setup signal handler for :
4076 * SIGINT, SIGTERM, SIGPIPE
4077 */
4078 static int set_signal_handler(void)
4079 {
4080 int ret = 0;
4081 struct sigaction sa;
4082 sigset_t sigset;
4083
4084 if ((ret = sigemptyset(&sigset)) < 0) {
4085 perror("sigemptyset");
4086 return ret;
4087 }
4088
4089 sa.sa_handler = sighandler;
4090 sa.sa_mask = sigset;
4091 sa.sa_flags = 0;
4092 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4093 perror("sigaction");
4094 return ret;
4095 }
4096
4097 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4098 perror("sigaction");
4099 return ret;
4100 }
4101
4102 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4103 perror("sigaction");
4104 return ret;
4105 }
4106
4107 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4108
4109 return ret;
4110 }
4111
4112 /*
4113 * Set open files limit to unlimited. This daemon can open a large number of
4114 * file descriptors in order to consumer multiple kernel traces.
4115 */
4116 static void set_ulimit(void)
4117 {
4118 int ret;
4119 struct rlimit lim;
4120
4121 /* The kernel does not allowed an infinite limit for open files */
4122 lim.rlim_cur = 65535;
4123 lim.rlim_max = 65535;
4124
4125 ret = setrlimit(RLIMIT_NOFILE, &lim);
4126 if (ret < 0) {
4127 perror("failed to set open files limit");
4128 }
4129 }
4130
4131 /*
4132 * main
4133 */
4134 int main(int argc, char **argv)
4135 {
4136 int ret = 0;
4137 void *status;
4138 const char *home_path;
4139
4140 rcu_register_thread();
4141
4142 /* Create thread quit pipe */
4143 if ((ret = init_thread_quit_pipe()) < 0) {
4144 goto error;
4145 }
4146
4147 setup_consumerd_path();
4148
4149 /* Parse arguments */
4150 progname = argv[0];
4151 if ((ret = parse_args(argc, argv) < 0)) {
4152 goto error;
4153 }
4154
4155 /* Daemonize */
4156 if (opt_daemon) {
4157 ret = daemon(0, 0);
4158 if (ret < 0) {
4159 perror("daemon");
4160 goto error;
4161 }
4162 }
4163
4164 /* Check if daemon is UID = 0 */
4165 is_root = !getuid();
4166
4167 if (is_root) {
4168 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4169
4170 /* Create global run dir with root access */
4171 ret = create_lttng_rundir(rundir);
4172 if (ret < 0) {
4173 goto error;
4174 }
4175
4176 if (strlen(apps_unix_sock_path) == 0) {
4177 snprintf(apps_unix_sock_path, PATH_MAX,
4178 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4179 }
4180
4181 if (strlen(client_unix_sock_path) == 0) {
4182 snprintf(client_unix_sock_path, PATH_MAX,
4183 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4184 }
4185
4186 /* Set global SHM for ust */
4187 if (strlen(wait_shm_path) == 0) {
4188 snprintf(wait_shm_path, PATH_MAX,
4189 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4190 }
4191
4192 /* Setup kernel consumerd path */
4193 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4194 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4195 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4196 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4197
4198 DBG2("Kernel consumer err path: %s",
4199 kconsumer_data.err_unix_sock_path);
4200 DBG2("Kernel consumer cmd path: %s",
4201 kconsumer_data.cmd_unix_sock_path);
4202 } else {
4203 home_path = get_home_dir();
4204 if (home_path == NULL) {
4205 /* TODO: Add --socket PATH option */
4206 ERR("Can't get HOME directory for sockets creation.");
4207 ret = -EPERM;
4208 goto error;
4209 }
4210
4211 /*
4212 * Create rundir from home path. This will create something like
4213 * $HOME/.lttng
4214 */
4215 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4216 if (ret < 0) {
4217 ret = -ENOMEM;
4218 goto error;
4219 }
4220
4221 ret = create_lttng_rundir(rundir);
4222 if (ret < 0) {
4223 goto error;
4224 }
4225
4226 if (strlen(apps_unix_sock_path) == 0) {
4227 snprintf(apps_unix_sock_path, PATH_MAX,
4228 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4229 }
4230
4231 /* Set the cli tool unix socket path */
4232 if (strlen(client_unix_sock_path) == 0) {
4233 snprintf(client_unix_sock_path, PATH_MAX,
4234 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4235 }
4236
4237 /* Set global SHM for ust */
4238 if (strlen(wait_shm_path) == 0) {
4239 snprintf(wait_shm_path, PATH_MAX,
4240 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4241 }
4242 }
4243
4244 DBG("Client socket path %s", client_unix_sock_path);
4245 DBG("Application socket path %s", apps_unix_sock_path);
4246 DBG("LTTng run directory path: %s", rundir);
4247
4248 /* 32 bits consumerd path setup */
4249 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4250 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4251 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4252 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4253
4254 DBG2("UST consumer 32 bits err path: %s",
4255 ustconsumer32_data.err_unix_sock_path);
4256 DBG2("UST consumer 32 bits cmd path: %s",
4257 ustconsumer32_data.cmd_unix_sock_path);
4258
4259 /* 64 bits consumerd path setup */
4260 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4261 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4262 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4263 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4264
4265 DBG2("UST consumer 64 bits err path: %s",
4266 ustconsumer64_data.err_unix_sock_path);
4267 DBG2("UST consumer 64 bits cmd path: %s",
4268 ustconsumer64_data.cmd_unix_sock_path);
4269
4270 /*
4271 * See if daemon already exist.
4272 */
4273 if ((ret = check_existing_daemon()) < 0) {
4274 ERR("Already running daemon.\n");
4275 /*
4276 * We do not goto exit because we must not cleanup()
4277 * because a daemon is already running.
4278 */
4279 goto error;
4280 }
4281
4282 /* After this point, we can safely call cleanup() with "goto exit" */
4283
4284 /*
4285 * These actions must be executed as root. We do that *after* setting up
4286 * the sockets path because we MUST make the check for another daemon using
4287 * those paths *before* trying to set the kernel consumer sockets and init
4288 * kernel tracer.
4289 */
4290 if (is_root) {
4291 ret = set_consumer_sockets(&kconsumer_data, rundir);
4292 if (ret < 0) {
4293 goto exit;
4294 }
4295
4296 /* Setup kernel tracer */
4297 if (!opt_no_kernel) {
4298 init_kernel_tracer();
4299 }
4300
4301 /* Set ulimit for open files */
4302 set_ulimit();
4303 }
4304
4305 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4306 if (ret < 0) {
4307 goto exit;
4308 }
4309
4310 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4311 if (ret < 0) {
4312 goto exit;
4313 }
4314
4315 if ((ret = set_signal_handler()) < 0) {
4316 goto exit;
4317 }
4318
4319 /* Setup the needed unix socket */
4320 if ((ret = init_daemon_socket()) < 0) {
4321 goto exit;
4322 }
4323
4324 /* Set credentials to socket */
4325 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4326 goto exit;
4327 }
4328
4329 /* Get parent pid if -S, --sig-parent is specified. */
4330 if (opt_sig_parent) {
4331 ppid = getppid();
4332 }
4333
4334 /* Setup the kernel pipe for waking up the kernel thread */
4335 if ((ret = create_kernel_poll_pipe()) < 0) {
4336 goto exit;
4337 }
4338
4339 /* Setup the thread apps communication pipe. */
4340 if ((ret = create_apps_cmd_pipe()) < 0) {
4341 goto exit;
4342 }
4343
4344 /* Init UST command queue. */
4345 cds_wfq_init(&ust_cmd_queue.queue);
4346
4347 /* Init UST app hash table */
4348 ust_app_ht_alloc();
4349
4350 /*
4351 * Get session list pointer. This pointer MUST NOT be free(). This list is
4352 * statically declared in session.c
4353 */
4354 session_list_ptr = session_get_list();
4355
4356 /* Set up max poll set size */
4357 lttng_poll_set_max_size();
4358
4359 /* Create thread to manage the client socket */
4360 ret = pthread_create(&client_thread, NULL,
4361 thread_manage_clients, (void *) NULL);
4362 if (ret != 0) {
4363 perror("pthread_create clients");
4364 goto exit_client;
4365 }
4366
4367 /* Create thread to dispatch registration */
4368 ret = pthread_create(&dispatch_thread, NULL,
4369 thread_dispatch_ust_registration, (void *) NULL);
4370 if (ret != 0) {
4371 perror("pthread_create dispatch");
4372 goto exit_dispatch;
4373 }
4374
4375 /* Create thread to manage application registration. */
4376 ret = pthread_create(&reg_apps_thread, NULL,
4377 thread_registration_apps, (void *) NULL);
4378 if (ret != 0) {
4379 perror("pthread_create registration");
4380 goto exit_reg_apps;
4381 }
4382
4383 /* Create thread to manage application socket */
4384 ret = pthread_create(&apps_thread, NULL,
4385 thread_manage_apps, (void *) NULL);
4386 if (ret != 0) {
4387 perror("pthread_create apps");
4388 goto exit_apps;
4389 }
4390
4391 /* Create kernel thread to manage kernel event */
4392 ret = pthread_create(&kernel_thread, NULL,
4393 thread_manage_kernel, (void *) NULL);
4394 if (ret != 0) {
4395 perror("pthread_create kernel");
4396 goto exit_kernel;
4397 }
4398
4399 ret = pthread_join(kernel_thread, &status);
4400 if (ret != 0) {
4401 perror("pthread_join");
4402 goto error; /* join error, exit without cleanup */
4403 }
4404
4405 exit_kernel:
4406 ret = pthread_join(apps_thread, &status);
4407 if (ret != 0) {
4408 perror("pthread_join");
4409 goto error; /* join error, exit without cleanup */
4410 }
4411
4412 exit_apps:
4413 ret = pthread_join(reg_apps_thread, &status);
4414 if (ret != 0) {
4415 perror("pthread_join");
4416 goto error; /* join error, exit without cleanup */
4417 }
4418
4419 exit_reg_apps:
4420 ret = pthread_join(dispatch_thread, &status);
4421 if (ret != 0) {
4422 perror("pthread_join");
4423 goto error; /* join error, exit without cleanup */
4424 }
4425
4426 exit_dispatch:
4427 ret = pthread_join(client_thread, &status);
4428 if (ret != 0) {
4429 perror("pthread_join");
4430 goto error; /* join error, exit without cleanup */
4431 }
4432
4433 ret = join_consumer_thread(&kconsumer_data);
4434 if (ret != 0) {
4435 perror("join_consumer");
4436 goto error; /* join error, exit without cleanup */
4437 }
4438
4439 exit_client:
4440 exit:
4441 /*
4442 * cleanup() is called when no other thread is running.
4443 */
4444 rcu_thread_online();
4445 cleanup();
4446 rcu_thread_offline();
4447 rcu_unregister_thread();
4448 if (!ret) {
4449 exit(EXIT_SUCCESS);
4450 }
4451 error:
4452 exit(EXIT_FAILURE);
4453 }
LTTng 2.0 tools and control repository
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