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61a762803668af2ffbbc330303b5034010bc6b87
[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[] = 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_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_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 tearing down 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 tearing down 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 sessions");
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 }
2035 tmp[i].loglevel = uevent->attr.loglevel;
2036 switch (uevent->attr.loglevel_type) {
2037 case LTTNG_UST_LOGLEVEL_ALL:
2038 tmp[i].type = LTTNG_EVENT_LOGLEVEL_ALL;
2039 break;
2040 case LTTNG_UST_LOGLEVEL_RANGE:
2041 tmp[i].type = LTTNG_EVENT_LOGLEVEL_RANGE;
2042 break;
2043 case LTTNG_UST_LOGLEVEL_SINGLE:
2044 tmp[i].type = LTTNG_EVENT_LOGLEVEL_SINGLE;
2045 break;
2046 }
2047 i++;
2048 }
2049
2050 ret = nb_event;
2051 *events = tmp;
2052
2053 error:
2054 rcu_read_unlock();
2055 return ret;
2056 }
2057
2058 /*
2059 * Fill lttng_event array of all kernel events in the channel.
2060 */
2061 static int list_lttng_kernel_events(char *channel_name,
2062 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2063 {
2064 int i = 0, ret;
2065 unsigned int nb_event;
2066 struct ltt_kernel_event *event;
2067 struct ltt_kernel_channel *kchan;
2068
2069 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2070 if (kchan == NULL) {
2071 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2072 goto error;
2073 }
2074
2075 nb_event = kchan->event_count;
2076
2077 DBG("Listing events for channel %s", kchan->channel->name);
2078
2079 if (nb_event == 0) {
2080 ret = nb_event;
2081 goto error;
2082 }
2083
2084 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2085 if (*events == NULL) {
2086 ret = LTTCOMM_FATAL;
2087 goto error;
2088 }
2089
2090 /* Kernel channels */
2091 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2092 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2093 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2094 (*events)[i].enabled = event->enabled;
2095 switch (event->event->instrumentation) {
2096 case LTTNG_KERNEL_TRACEPOINT:
2097 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2098 break;
2099 case LTTNG_KERNEL_KPROBE:
2100 case LTTNG_KERNEL_KRETPROBE:
2101 (*events)[i].type = LTTNG_EVENT_PROBE;
2102 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2103 sizeof(struct lttng_kernel_kprobe));
2104 break;
2105 case LTTNG_KERNEL_FUNCTION:
2106 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2107 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2108 sizeof(struct lttng_kernel_function));
2109 break;
2110 case LTTNG_KERNEL_NOOP:
2111 (*events)[i].type = LTTNG_EVENT_NOOP;
2112 break;
2113 case LTTNG_KERNEL_SYSCALL:
2114 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2115 break;
2116 case LTTNG_KERNEL_ALL:
2117 assert(0);
2118 break;
2119 }
2120 i++;
2121 }
2122
2123 return nb_event;
2124
2125 error:
2126 return ret;
2127 }
2128
2129 /*
2130 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2131 */
2132 static int cmd_disable_channel(struct ltt_session *session,
2133 int domain, char *channel_name)
2134 {
2135 int ret;
2136 struct ltt_ust_session *usess;
2137
2138 usess = session->ust_session;
2139
2140 switch (domain) {
2141 case LTTNG_DOMAIN_KERNEL:
2142 {
2143 ret = channel_kernel_disable(session->kernel_session,
2144 channel_name);
2145 if (ret != LTTCOMM_OK) {
2146 goto error;
2147 }
2148
2149 kernel_wait_quiescent(kernel_tracer_fd);
2150 break;
2151 }
2152 case LTTNG_DOMAIN_UST:
2153 {
2154 struct ltt_ust_channel *uchan;
2155 struct lttng_ht *chan_ht;
2156
2157 chan_ht = usess->domain_global.channels;
2158
2159 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2160 if (uchan == NULL) {
2161 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2162 goto error;
2163 }
2164
2165 ret = channel_ust_disable(usess, domain, uchan);
2166 if (ret != LTTCOMM_OK) {
2167 goto error;
2168 }
2169 break;
2170 }
2171 #if 0
2172 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2173 case LTTNG_DOMAIN_UST_EXEC_NAME:
2174 case LTTNG_DOMAIN_UST_PID:
2175 #endif
2176 default:
2177 ret = LTTCOMM_UNKNOWN_DOMAIN;
2178 goto error;
2179 }
2180
2181 ret = LTTCOMM_OK;
2182
2183 error:
2184 return ret;
2185 }
2186
2187 /*
2188 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2189 */
2190 static int cmd_enable_channel(struct ltt_session *session,
2191 int domain, struct lttng_channel *attr)
2192 {
2193 int ret;
2194 struct ltt_ust_session *usess = session->ust_session;
2195 struct lttng_ht *chan_ht;
2196
2197 DBG("Enabling channel %s for session %s", attr->name, session->name);
2198
2199 switch (domain) {
2200 case LTTNG_DOMAIN_KERNEL:
2201 {
2202 struct ltt_kernel_channel *kchan;
2203
2204 kchan = trace_kernel_get_channel_by_name(attr->name,
2205 session->kernel_session);
2206 if (kchan == NULL) {
2207 ret = channel_kernel_create(session->kernel_session,
2208 attr, kernel_poll_pipe[1]);
2209 } else {
2210 ret = channel_kernel_enable(session->kernel_session, kchan);
2211 }
2212
2213 if (ret != LTTCOMM_OK) {
2214 goto error;
2215 }
2216
2217 kernel_wait_quiescent(kernel_tracer_fd);
2218 break;
2219 }
2220 case LTTNG_DOMAIN_UST:
2221 {
2222 struct ltt_ust_channel *uchan;
2223
2224 chan_ht = usess->domain_global.channels;
2225
2226 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2227 if (uchan == NULL) {
2228 ret = channel_ust_create(usess, domain, attr);
2229 } else {
2230 ret = channel_ust_enable(usess, domain, uchan);
2231 }
2232 break;
2233 }
2234 #if 0
2235 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2236 case LTTNG_DOMAIN_UST_EXEC_NAME:
2237 case LTTNG_DOMAIN_UST_PID:
2238 #endif
2239 default:
2240 ret = LTTCOMM_UNKNOWN_DOMAIN;
2241 goto error;
2242 }
2243
2244 error:
2245 return ret;
2246 }
2247
2248 /*
2249 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2250 */
2251 static int cmd_disable_event(struct ltt_session *session, int domain,
2252 char *channel_name, char *event_name)
2253 {
2254 int ret;
2255
2256 switch (domain) {
2257 case LTTNG_DOMAIN_KERNEL:
2258 {
2259 struct ltt_kernel_channel *kchan;
2260 struct ltt_kernel_session *ksess;
2261
2262 ksess = session->kernel_session;
2263
2264 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2265 if (kchan == NULL) {
2266 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2267 goto error;
2268 }
2269
2270 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2271 if (ret != LTTCOMM_OK) {
2272 goto error;
2273 }
2274
2275 kernel_wait_quiescent(kernel_tracer_fd);
2276 break;
2277 }
2278 case LTTNG_DOMAIN_UST:
2279 {
2280 struct ltt_ust_channel *uchan;
2281 struct ltt_ust_session *usess;
2282
2283 usess = session->ust_session;
2284
2285 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2286 channel_name);
2287 if (uchan == NULL) {
2288 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2289 goto error;
2290 }
2291
2292 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2293 if (ret != LTTCOMM_OK) {
2294 goto error;
2295 }
2296
2297 DBG3("Disable UST event %s in channel %s completed", event_name,
2298 channel_name);
2299 break;
2300 }
2301 #if 0
2302 case LTTNG_DOMAIN_UST_EXEC_NAME:
2303 case LTTNG_DOMAIN_UST_PID:
2304 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2305 #endif
2306 default:
2307 ret = LTTCOMM_UND;
2308 goto error;
2309 }
2310
2311 ret = LTTCOMM_OK;
2312
2313 error:
2314 return ret;
2315 }
2316
2317 /*
2318 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2319 */
2320 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2321 char *channel_name)
2322 {
2323 int ret;
2324
2325 switch (domain) {
2326 case LTTNG_DOMAIN_KERNEL:
2327 {
2328 struct ltt_kernel_session *ksess;
2329 struct ltt_kernel_channel *kchan;
2330
2331 ksess = session->kernel_session;
2332
2333 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2334 if (kchan == NULL) {
2335 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2336 goto error;
2337 }
2338
2339 ret = event_kernel_disable_all(ksess, kchan);
2340 if (ret != LTTCOMM_OK) {
2341 goto error;
2342 }
2343
2344 kernel_wait_quiescent(kernel_tracer_fd);
2345 break;
2346 }
2347 case LTTNG_DOMAIN_UST:
2348 {
2349 struct ltt_ust_session *usess;
2350 struct ltt_ust_channel *uchan;
2351
2352 usess = session->ust_session;
2353
2354 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2355 channel_name);
2356 if (uchan == NULL) {
2357 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2358 goto error;
2359 }
2360
2361 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2362 if (ret != 0) {
2363 goto error;
2364 }
2365
2366 DBG3("Disable all UST events in channel %s completed", channel_name);
2367
2368 break;
2369 }
2370 #if 0
2371 case LTTNG_DOMAIN_UST_EXEC_NAME:
2372 case LTTNG_DOMAIN_UST_PID:
2373 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2374 #endif
2375 default:
2376 ret = LTTCOMM_UND;
2377 goto error;
2378 }
2379
2380 ret = LTTCOMM_OK;
2381
2382 error:
2383 return ret;
2384 }
2385
2386 /*
2387 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2388 */
2389 static int cmd_add_context(struct ltt_session *session, int domain,
2390 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2391 {
2392 int ret;
2393
2394 switch (domain) {
2395 case LTTNG_DOMAIN_KERNEL:
2396 /* Add kernel context to kernel tracer */
2397 ret = context_kernel_add(session->kernel_session, ctx,
2398 event_name, channel_name);
2399 if (ret != LTTCOMM_OK) {
2400 goto error;
2401 }
2402 break;
2403 case LTTNG_DOMAIN_UST:
2404 {
2405 struct ltt_ust_session *usess = session->ust_session;
2406
2407 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2408 if (ret != LTTCOMM_OK) {
2409 goto error;
2410 }
2411 break;
2412 }
2413 #if 0
2414 case LTTNG_DOMAIN_UST_EXEC_NAME:
2415 case LTTNG_DOMAIN_UST_PID:
2416 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2417 #endif
2418 default:
2419 ret = LTTCOMM_UND;
2420 goto error;
2421 }
2422
2423 ret = LTTCOMM_OK;
2424
2425 error:
2426 return ret;
2427 }
2428
2429 /*
2430 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2431 */
2432 static int cmd_enable_event(struct ltt_session *session, int domain,
2433 char *channel_name, struct lttng_event *event)
2434 {
2435 int ret;
2436 struct lttng_channel *attr;
2437 struct ltt_ust_session *usess = session->ust_session;
2438
2439 switch (domain) {
2440 case LTTNG_DOMAIN_KERNEL:
2441 {
2442 struct ltt_kernel_channel *kchan;
2443
2444 kchan = trace_kernel_get_channel_by_name(channel_name,
2445 session->kernel_session);
2446 if (kchan == NULL) {
2447 attr = channel_new_default_attr(domain);
2448 if (attr == NULL) {
2449 ret = LTTCOMM_FATAL;
2450 goto error;
2451 }
2452 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2453
2454 /* This call will notify the kernel thread */
2455 ret = channel_kernel_create(session->kernel_session,
2456 attr, kernel_poll_pipe[1]);
2457 if (ret != LTTCOMM_OK) {
2458 free(attr);
2459 goto error;
2460 }
2461 free(attr);
2462 }
2463
2464 /* Get the newly created kernel channel pointer */
2465 kchan = trace_kernel_get_channel_by_name(channel_name,
2466 session->kernel_session);
2467 if (kchan == NULL) {
2468 /* This sould not happen... */
2469 ret = LTTCOMM_FATAL;
2470 goto error;
2471 }
2472
2473 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2474 event);
2475 if (ret != LTTCOMM_OK) {
2476 goto error;
2477 }
2478
2479 kernel_wait_quiescent(kernel_tracer_fd);
2480 break;
2481 }
2482 case LTTNG_DOMAIN_UST:
2483 {
2484 struct lttng_channel *attr;
2485 struct ltt_ust_channel *uchan;
2486
2487 /* Get channel from global UST domain */
2488 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2489 channel_name);
2490 if (uchan == NULL) {
2491 /* Create default channel */
2492 attr = channel_new_default_attr(domain);
2493 if (attr == NULL) {
2494 ret = LTTCOMM_FATAL;
2495 goto error;
2496 }
2497 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2498 attr->name[NAME_MAX - 1] = '\0';
2499
2500 ret = channel_ust_create(usess, domain, attr);
2501 if (ret != LTTCOMM_OK) {
2502 free(attr);
2503 goto error;
2504 }
2505 free(attr);
2506
2507 /* Get the newly created channel reference back */
2508 uchan = trace_ust_find_channel_by_name(
2509 usess->domain_global.channels, channel_name);
2510 if (uchan == NULL) {
2511 /* Something is really wrong */
2512 ret = LTTCOMM_FATAL;
2513 goto error;
2514 }
2515 }
2516
2517 /* At this point, the session and channel exist on the tracer */
2518 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2519 if (ret != LTTCOMM_OK) {
2520 goto error;
2521 }
2522 break;
2523 }
2524 #if 0
2525 case LTTNG_DOMAIN_UST_EXEC_NAME:
2526 case LTTNG_DOMAIN_UST_PID:
2527 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2528 #endif
2529 default:
2530 ret = LTTCOMM_UND;
2531 goto error;
2532 }
2533
2534 ret = LTTCOMM_OK;
2535
2536 error:
2537 return ret;
2538 }
2539
2540 /*
2541 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2542 */
2543 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2544 char *channel_name, int event_type)
2545 {
2546 int ret;
2547 struct ltt_kernel_channel *kchan;
2548
2549 switch (domain) {
2550 case LTTNG_DOMAIN_KERNEL:
2551 kchan = trace_kernel_get_channel_by_name(channel_name,
2552 session->kernel_session);
2553 if (kchan == NULL) {
2554 /* This call will notify the kernel thread */
2555 ret = channel_kernel_create(session->kernel_session, NULL,
2556 kernel_poll_pipe[1]);
2557 if (ret != LTTCOMM_OK) {
2558 goto error;
2559 }
2560
2561 /* Get the newly created kernel channel pointer */
2562 kchan = trace_kernel_get_channel_by_name(channel_name,
2563 session->kernel_session);
2564 if (kchan == NULL) {
2565 /* This sould not happen... */
2566 ret = LTTCOMM_FATAL;
2567 goto error;
2568 }
2569
2570 }
2571
2572 switch (event_type) {
2573 case LTTNG_EVENT_SYSCALL:
2574 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2575 kchan, kernel_tracer_fd);
2576 break;
2577 case LTTNG_EVENT_TRACEPOINT:
2578 /*
2579 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2580 * events already registered to the channel.
2581 */
2582 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2583 kchan, kernel_tracer_fd);
2584 break;
2585 case LTTNG_EVENT_ALL:
2586 /* Enable syscalls and tracepoints */
2587 ret = event_kernel_enable_all(session->kernel_session,
2588 kchan, kernel_tracer_fd);
2589 break;
2590 default:
2591 ret = LTTCOMM_KERN_ENABLE_FAIL;
2592 goto error;
2593 }
2594
2595 /* Manage return value */
2596 if (ret != LTTCOMM_OK) {
2597 goto error;
2598 }
2599
2600 kernel_wait_quiescent(kernel_tracer_fd);
2601 break;
2602 case LTTNG_DOMAIN_UST:
2603 {
2604 struct lttng_channel *attr;
2605 struct ltt_ust_channel *uchan;
2606 struct ltt_ust_session *usess = session->ust_session;
2607
2608 /* Get channel from global UST domain */
2609 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2610 channel_name);
2611 if (uchan == NULL) {
2612 /* Create default channel */
2613 attr = channel_new_default_attr(domain);
2614 if (attr == NULL) {
2615 ret = LTTCOMM_FATAL;
2616 goto error;
2617 }
2618 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2619 attr->name[NAME_MAX - 1] = '\0';
2620
2621 /* Use the internal command enable channel */
2622 ret = channel_ust_create(usess, domain, attr);
2623 if (ret != LTTCOMM_OK) {
2624 free(attr);
2625 goto error;
2626 }
2627 free(attr);
2628
2629 /* Get the newly created channel reference back */
2630 uchan = trace_ust_find_channel_by_name(
2631 usess->domain_global.channels, channel_name);
2632 if (uchan == NULL) {
2633 /* Something is really wrong */
2634 ret = LTTCOMM_FATAL;
2635 goto error;
2636 }
2637 }
2638
2639 /* At this point, the session and channel exist on the tracer */
2640
2641 switch (event_type) {
2642 case LTTNG_EVENT_ALL:
2643 case LTTNG_EVENT_TRACEPOINT:
2644 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2645 if (ret != LTTCOMM_OK) {
2646 goto error;
2647 }
2648 break;
2649 default:
2650 ret = LTTCOMM_UST_ENABLE_FAIL;
2651 goto error;
2652 }
2653
2654 /* Manage return value */
2655 if (ret != LTTCOMM_OK) {
2656 goto error;
2657 }
2658
2659 break;
2660 }
2661 #if 0
2662 case LTTNG_DOMAIN_UST_EXEC_NAME:
2663 case LTTNG_DOMAIN_UST_PID:
2664 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2665 #endif
2666 default:
2667 ret = LTTCOMM_UND;
2668 goto error;
2669 }
2670
2671 ret = LTTCOMM_OK;
2672
2673 error:
2674 return ret;
2675 }
2676
2677 /*
2678 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2679 */
2680 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2681 {
2682 int ret;
2683 ssize_t nb_events = 0;
2684
2685 switch (domain) {
2686 case LTTNG_DOMAIN_KERNEL:
2687 nb_events = kernel_list_events(kernel_tracer_fd, events);
2688 if (nb_events < 0) {
2689 ret = LTTCOMM_KERN_LIST_FAIL;
2690 goto error;
2691 }
2692 break;
2693 case LTTNG_DOMAIN_UST:
2694 nb_events = ust_app_list_events(events);
2695 if (nb_events < 0) {
2696 ret = LTTCOMM_UST_LIST_FAIL;
2697 goto error;
2698 }
2699 break;
2700 default:
2701 ret = LTTCOMM_UND;
2702 goto error;
2703 }
2704
2705 return nb_events;
2706
2707 error:
2708 /* Return negative value to differentiate return code */
2709 return -ret;
2710 }
2711
2712 /*
2713 * Command LTTNG_START_TRACE processed by the client thread.
2714 */
2715 static int cmd_start_trace(struct ltt_session *session)
2716 {
2717 int ret;
2718 struct ltt_kernel_session *ksession;
2719 struct ltt_ust_session *usess;
2720
2721 /* Short cut */
2722 ksession = session->kernel_session;
2723 usess = session->ust_session;
2724
2725 if (session->enabled) {
2726 ret = LTTCOMM_UST_START_FAIL;
2727 goto error;
2728 }
2729
2730 session->enabled = 1;
2731
2732 /* Kernel tracing */
2733 if (ksession != NULL) {
2734 struct ltt_kernel_channel *kchan;
2735
2736 /* Open kernel metadata */
2737 if (ksession->metadata == NULL) {
2738 ret = kernel_open_metadata(ksession, ksession->trace_path);
2739 if (ret < 0) {
2740 ret = LTTCOMM_KERN_META_FAIL;
2741 goto error;
2742 }
2743 }
2744
2745 /* Open kernel metadata stream */
2746 if (ksession->metadata_stream_fd == 0) {
2747 ret = kernel_open_metadata_stream(ksession);
2748 if (ret < 0) {
2749 ERR("Kernel create metadata stream failed");
2750 ret = LTTCOMM_KERN_STREAM_FAIL;
2751 goto error;
2752 }
2753 }
2754
2755 /* For each channel */
2756 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2757 if (kchan->stream_count == 0) {
2758 ret = kernel_open_channel_stream(kchan);
2759 if (ret < 0) {
2760 ret = LTTCOMM_KERN_STREAM_FAIL;
2761 goto error;
2762 }
2763 /* Update the stream global counter */
2764 ksession->stream_count_global += ret;
2765 }
2766 }
2767
2768 /* Setup kernel consumer socket and send fds to it */
2769 ret = init_kernel_tracing(ksession);
2770 if (ret < 0) {
2771 ret = LTTCOMM_KERN_START_FAIL;
2772 goto error;
2773 }
2774
2775 /* This start the kernel tracing */
2776 ret = kernel_start_session(ksession);
2777 if (ret < 0) {
2778 ret = LTTCOMM_KERN_START_FAIL;
2779 goto error;
2780 }
2781
2782 /* Quiescent wait after starting trace */
2783 kernel_wait_quiescent(kernel_tracer_fd);
2784 }
2785
2786 /* Flag session that trace should start automatically */
2787 if (usess) {
2788 usess->start_trace = 1;
2789
2790 ret = ust_app_start_trace_all(usess);
2791 if (ret < 0) {
2792 ret = LTTCOMM_UST_START_FAIL;
2793 goto error;
2794 }
2795 }
2796
2797 ret = LTTCOMM_OK;
2798
2799 error:
2800 return ret;
2801 }
2802
2803 /*
2804 * Command LTTNG_STOP_TRACE processed by the client thread.
2805 */
2806 static int cmd_stop_trace(struct ltt_session *session)
2807 {
2808 int ret;
2809 struct ltt_kernel_channel *kchan;
2810 struct ltt_kernel_session *ksession;
2811 struct ltt_ust_session *usess;
2812
2813 /* Short cut */
2814 ksession = session->kernel_session;
2815 usess = session->ust_session;
2816
2817 if (!session->enabled) {
2818 ret = LTTCOMM_UST_STOP_FAIL;
2819 goto error;
2820 }
2821
2822 session->enabled = 0;
2823
2824 /* Kernel tracer */
2825 if (ksession != NULL) {
2826 DBG("Stop kernel tracing");
2827
2828 /* Flush all buffers before stopping */
2829 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2830 if (ret < 0) {
2831 ERR("Kernel metadata flush failed");
2832 }
2833
2834 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2835 ret = kernel_flush_buffer(kchan);
2836 if (ret < 0) {
2837 ERR("Kernel flush buffer error");
2838 }
2839 }
2840
2841 ret = kernel_stop_session(ksession);
2842 if (ret < 0) {
2843 ret = LTTCOMM_KERN_STOP_FAIL;
2844 goto error;
2845 }
2846
2847 kernel_wait_quiescent(kernel_tracer_fd);
2848 }
2849
2850 if (usess) {
2851 usess->start_trace = 0;
2852
2853 ret = ust_app_stop_trace_all(usess);
2854 if (ret < 0) {
2855 ret = LTTCOMM_UST_STOP_FAIL;
2856 goto error;
2857 }
2858 }
2859
2860 ret = LTTCOMM_OK;
2861
2862 error:
2863 return ret;
2864 }
2865
2866 /*
2867 * Command LTTNG_CREATE_SESSION processed by the client thread.
2868 */
2869 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2870 {
2871 int ret;
2872
2873 ret = session_create(name, path, creds->uid, creds->gid);
2874 if (ret != LTTCOMM_OK) {
2875 goto error;
2876 }
2877
2878 ret = LTTCOMM_OK;
2879
2880 error:
2881 return ret;
2882 }
2883
2884 /*
2885 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2886 */
2887 static int cmd_destroy_session(struct ltt_session *session, char *name)
2888 {
2889 int ret;
2890
2891 /* Clean kernel session teardown */
2892 teardown_kernel_session(session);
2893 /* UST session teardown */
2894 teardown_ust_session(session);
2895
2896 /*
2897 * Must notify the kernel thread here to update it's poll setin order
2898 * to remove the channel(s)' fd just destroyed.
2899 */
2900 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2901 if (ret < 0) {
2902 perror("write kernel poll pipe");
2903 }
2904
2905 ret = session_destroy(session);
2906
2907 return ret;
2908 }
2909
2910 /*
2911 * Command LTTNG_CALIBRATE processed by the client thread.
2912 */
2913 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2914 {
2915 int ret;
2916
2917 switch (domain) {
2918 case LTTNG_DOMAIN_KERNEL:
2919 {
2920 struct lttng_kernel_calibrate kcalibrate;
2921
2922 kcalibrate.type = calibrate->type;
2923 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2924 if (ret < 0) {
2925 ret = LTTCOMM_KERN_ENABLE_FAIL;
2926 goto error;
2927 }
2928 break;
2929 }
2930 case LTTNG_DOMAIN_UST:
2931 {
2932 struct lttng_ust_calibrate ucalibrate;
2933
2934 ucalibrate.type = calibrate->type;
2935 ret = ust_app_calibrate_glb(&ucalibrate);
2936 if (ret < 0) {
2937 ret = LTTCOMM_UST_CALIBRATE_FAIL;
2938 goto error;
2939 }
2940 break;
2941 }
2942 default:
2943 ret = LTTCOMM_UND;
2944 goto error;
2945 }
2946
2947 ret = LTTCOMM_OK;
2948
2949 error:
2950 return ret;
2951 }
2952
2953 /*
2954 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2955 */
2956 static int cmd_register_consumer(struct ltt_session *session, int domain,
2957 char *sock_path)
2958 {
2959 int ret, sock;
2960
2961 switch (domain) {
2962 case LTTNG_DOMAIN_KERNEL:
2963 /* Can't register a consumer if there is already one */
2964 if (session->kernel_session->consumer_fds_sent != 0) {
2965 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2966 goto error;
2967 }
2968
2969 sock = lttcomm_connect_unix_sock(sock_path);
2970 if (sock < 0) {
2971 ret = LTTCOMM_CONNECT_FAIL;
2972 goto error;
2973 }
2974
2975 session->kernel_session->consumer_fd = sock;
2976 break;
2977 default:
2978 /* TODO: Userspace tracing */
2979 ret = LTTCOMM_UND;
2980 goto error;
2981 }
2982
2983 ret = LTTCOMM_OK;
2984
2985 error:
2986 return ret;
2987 }
2988
2989 /*
2990 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2991 */
2992 static ssize_t cmd_list_domains(struct ltt_session *session,
2993 struct lttng_domain **domains)
2994 {
2995 int ret, index = 0;
2996 ssize_t nb_dom = 0;
2997
2998 if (session->kernel_session != NULL) {
2999 DBG3("Listing domains found kernel domain");
3000 nb_dom++;
3001 }
3002
3003 if (session->ust_session != NULL) {
3004 DBG3("Listing domains found UST global domain");
3005 nb_dom++;
3006 }
3007
3008 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
3009 if (*domains == NULL) {
3010 ret = -LTTCOMM_FATAL;
3011 goto error;
3012 }
3013
3014 if (session->kernel_session != NULL) {
3015 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3016 index++;
3017 }
3018
3019 if (session->ust_session != NULL) {
3020 (*domains)[index].type = LTTNG_DOMAIN_UST;
3021 index++;
3022 }
3023
3024 return nb_dom;
3025
3026 error:
3027 return ret;
3028 }
3029
3030 /*
3031 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3032 */
3033 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3034 struct lttng_channel **channels)
3035 {
3036 int ret;
3037 ssize_t nb_chan = 0;
3038
3039 switch (domain) {
3040 case LTTNG_DOMAIN_KERNEL:
3041 if (session->kernel_session != NULL) {
3042 nb_chan = session->kernel_session->channel_count;
3043 }
3044 DBG3("Number of kernel channels %zd", nb_chan);
3045 break;
3046 case LTTNG_DOMAIN_UST:
3047 if (session->ust_session != NULL) {
3048 nb_chan = lttng_ht_get_count(
3049 session->ust_session->domain_global.channels);
3050 }
3051 DBG3("Number of UST global channels %zd", nb_chan);
3052 break;
3053 default:
3054 *channels = NULL;
3055 ret = -LTTCOMM_UND;
3056 goto error;
3057 }
3058
3059 if (nb_chan > 0) {
3060 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3061 if (*channels == NULL) {
3062 ret = -LTTCOMM_FATAL;
3063 goto error;
3064 }
3065
3066 list_lttng_channels(domain, session, *channels);
3067 } else {
3068 *channels = NULL;
3069 }
3070
3071 return nb_chan;
3072
3073 error:
3074 return ret;
3075 }
3076
3077 /*
3078 * Command LTTNG_LIST_EVENTS processed by the client thread.
3079 */
3080 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3081 char *channel_name, struct lttng_event **events)
3082 {
3083 int ret = 0;
3084 ssize_t nb_event = 0;
3085
3086 switch (domain) {
3087 case LTTNG_DOMAIN_KERNEL:
3088 if (session->kernel_session != NULL) {
3089 nb_event = list_lttng_kernel_events(channel_name,
3090 session->kernel_session, events);
3091 }
3092 break;
3093 case LTTNG_DOMAIN_UST:
3094 {
3095 if (session->ust_session != NULL) {
3096 nb_event = list_lttng_ust_global_events(channel_name,
3097 &session->ust_session->domain_global, events);
3098 }
3099 break;
3100 }
3101 default:
3102 ret = -LTTCOMM_UND;
3103 goto error;
3104 }
3105
3106 ret = nb_event;
3107
3108 error:
3109 return ret;
3110 }
3111
3112 /*
3113 * Process the command requested by the lttng client within the command
3114 * context structure. This function make sure that the return structure (llm)
3115 * is set and ready for transmission before returning.
3116 *
3117 * Return any error encountered or 0 for success.
3118 */
3119 static int process_client_msg(struct command_ctx *cmd_ctx)
3120 {
3121 int ret = LTTCOMM_OK;
3122 int need_tracing_session = 1;
3123
3124 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3125
3126 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3127 ret = LTTCOMM_KERN_NA;
3128 goto error;
3129 }
3130
3131 /*
3132 * Check for command that don't needs to allocate a returned payload. We do
3133 * this here so we don't have to make the call for no payload at each
3134 * command.
3135 */
3136 switch(cmd_ctx->lsm->cmd_type) {
3137 case LTTNG_LIST_SESSIONS:
3138 case LTTNG_LIST_TRACEPOINTS:
3139 case LTTNG_LIST_DOMAINS:
3140 case LTTNG_LIST_CHANNELS:
3141 case LTTNG_LIST_EVENTS:
3142 break;
3143 default:
3144 /* Setup lttng message with no payload */
3145 ret = setup_lttng_msg(cmd_ctx, 0);
3146 if (ret < 0) {
3147 /* This label does not try to unlock the session */
3148 goto init_setup_error;
3149 }
3150 }
3151
3152 /* Commands that DO NOT need a session. */
3153 switch (cmd_ctx->lsm->cmd_type) {
3154 case LTTNG_CALIBRATE:
3155 case LTTNG_CREATE_SESSION:
3156 case LTTNG_LIST_SESSIONS:
3157 case LTTNG_LIST_TRACEPOINTS:
3158 need_tracing_session = 0;
3159 break;
3160 default:
3161 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3162 session_lock_list();
3163 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3164 session_unlock_list();
3165 if (cmd_ctx->session == NULL) {
3166 if (cmd_ctx->lsm->session.name != NULL) {
3167 ret = LTTCOMM_SESS_NOT_FOUND;
3168 } else {
3169 /* If no session name specified */
3170 ret = LTTCOMM_SELECT_SESS;
3171 }
3172 goto error;
3173 } else {
3174 /* Acquire lock for the session */
3175 session_lock(cmd_ctx->session);
3176 }
3177 break;
3178 }
3179
3180 /*
3181 * Check domain type for specific "pre-action".
3182 */
3183 switch (cmd_ctx->lsm->domain.type) {
3184 case LTTNG_DOMAIN_KERNEL:
3185 if (!is_root) {
3186 ret = LTTCOMM_KERN_NA;
3187 goto error;
3188 }
3189
3190 /* Kernel tracer check */
3191 if (kernel_tracer_fd == 0) {
3192 /* Basically, load kernel tracer modules */
3193 ret = init_kernel_tracer();
3194 if (ret != 0) {
3195 goto error;
3196 }
3197 }
3198
3199 /* Need a session for kernel command */
3200 if (need_tracing_session) {
3201 if (cmd_ctx->session->kernel_session == NULL) {
3202 ret = create_kernel_session(cmd_ctx->session);
3203 if (ret < 0) {
3204 ret = LTTCOMM_KERN_SESS_FAIL;
3205 goto error;
3206 }
3207 }
3208
3209 /* Start the kernel consumer daemon */
3210 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3211 if (kconsumer_data.pid == 0 &&
3212 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3213 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3214 ret = start_consumerd(&kconsumer_data);
3215 if (ret < 0) {
3216 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3217 goto error;
3218 }
3219 } else {
3220 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3221 }
3222 }
3223 break;
3224 case LTTNG_DOMAIN_UST:
3225 {
3226 if (need_tracing_session) {
3227 if (cmd_ctx->session->ust_session == NULL) {
3228 ret = create_ust_session(cmd_ctx->session,
3229 &cmd_ctx->lsm->domain);
3230 if (ret != LTTCOMM_OK) {
3231 goto error;
3232 }
3233 }
3234 /* Start the UST consumer daemons */
3235 /* 64-bit */
3236 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3237 if (consumerd64_bin[0] != '\0' &&
3238 ustconsumer64_data.pid == 0 &&
3239 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3240 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3241 ret = start_consumerd(&ustconsumer64_data);
3242 if (ret < 0) {
3243 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3244 ust_consumerd64_fd = -EINVAL;
3245 goto error;
3246 }
3247
3248 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3249 } else {
3250 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3251 }
3252 /* 32-bit */
3253 if (consumerd32_bin[0] != '\0' &&
3254 ustconsumer32_data.pid == 0 &&
3255 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3256 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3257 ret = start_consumerd(&ustconsumer32_data);
3258 if (ret < 0) {
3259 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3260 ust_consumerd32_fd = -EINVAL;
3261 goto error;
3262 }
3263 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3264 } else {
3265 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3266 }
3267 }
3268 break;
3269 }
3270 default:
3271 break;
3272 }
3273
3274 /*
3275 * Check that the UID or GID match that of the tracing session.
3276 * The root user can interact with all sessions.
3277 */
3278 if (need_tracing_session) {
3279 if (!session_access_ok(cmd_ctx->session,
3280 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3281 ret = LTTCOMM_EPERM;
3282 goto error;
3283 }
3284 }
3285
3286 /* Process by command type */
3287 switch (cmd_ctx->lsm->cmd_type) {
3288 case LTTNG_ADD_CONTEXT:
3289 {
3290 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3291 cmd_ctx->lsm->u.context.channel_name,
3292 cmd_ctx->lsm->u.context.event_name,
3293 &cmd_ctx->lsm->u.context.ctx);
3294 break;
3295 }
3296 case LTTNG_DISABLE_CHANNEL:
3297 {
3298 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3299 cmd_ctx->lsm->u.disable.channel_name);
3300 break;
3301 }
3302 case LTTNG_DISABLE_EVENT:
3303 {
3304 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3305 cmd_ctx->lsm->u.disable.channel_name,
3306 cmd_ctx->lsm->u.disable.name);
3307 break;
3308 }
3309 case LTTNG_DISABLE_ALL_EVENT:
3310 {
3311 DBG("Disabling all events");
3312
3313 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3314 cmd_ctx->lsm->u.disable.channel_name);
3315 break;
3316 }
3317 case LTTNG_ENABLE_CHANNEL:
3318 {
3319 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3320 &cmd_ctx->lsm->u.channel.chan);
3321 break;
3322 }
3323 case LTTNG_ENABLE_EVENT:
3324 {
3325 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3326 cmd_ctx->lsm->u.enable.channel_name,
3327 &cmd_ctx->lsm->u.enable.event);
3328 break;
3329 }
3330 case LTTNG_ENABLE_ALL_EVENT:
3331 {
3332 DBG("Enabling all events");
3333
3334 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3335 cmd_ctx->lsm->u.enable.channel_name,
3336 cmd_ctx->lsm->u.enable.event.type);
3337 break;
3338 }
3339 case LTTNG_LIST_TRACEPOINTS:
3340 {
3341 struct lttng_event *events;
3342 ssize_t nb_events;
3343
3344 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3345 if (nb_events < 0) {
3346 ret = -nb_events;
3347 goto error;
3348 }
3349
3350 /*
3351 * Setup lttng message with payload size set to the event list size in
3352 * bytes and then copy list into the llm payload.
3353 */
3354 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3355 if (ret < 0) {
3356 free(events);
3357 goto setup_error;
3358 }
3359
3360 /* Copy event list into message payload */
3361 memcpy(cmd_ctx->llm->payload, events,
3362 sizeof(struct lttng_event) * nb_events);
3363
3364 free(events);
3365
3366 ret = LTTCOMM_OK;
3367 break;
3368 }
3369 case LTTNG_START_TRACE:
3370 {
3371 ret = cmd_start_trace(cmd_ctx->session);
3372 break;
3373 }
3374 case LTTNG_STOP_TRACE:
3375 {
3376 ret = cmd_stop_trace(cmd_ctx->session);
3377 break;
3378 }
3379 case LTTNG_CREATE_SESSION:
3380 {
3381 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3382 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3383 break;
3384 }
3385 case LTTNG_DESTROY_SESSION:
3386 {
3387 ret = cmd_destroy_session(cmd_ctx->session,
3388 cmd_ctx->lsm->session.name);
3389 break;
3390 }
3391 case LTTNG_LIST_DOMAINS:
3392 {
3393 ssize_t nb_dom;
3394 struct lttng_domain *domains;
3395
3396 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3397 if (nb_dom < 0) {
3398 ret = -nb_dom;
3399 goto error;
3400 }
3401
3402 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3403 if (ret < 0) {
3404 goto setup_error;
3405 }
3406
3407 /* Copy event list into message payload */
3408 memcpy(cmd_ctx->llm->payload, domains,
3409 nb_dom * sizeof(struct lttng_domain));
3410
3411 free(domains);
3412
3413 ret = LTTCOMM_OK;
3414 break;
3415 }
3416 case LTTNG_LIST_CHANNELS:
3417 {
3418 size_t nb_chan;
3419 struct lttng_channel *channels;
3420
3421 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3422 cmd_ctx->session, &channels);
3423 if (nb_chan < 0) {
3424 ret = -nb_chan;
3425 goto error;
3426 }
3427
3428 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3429 if (ret < 0) {
3430 goto setup_error;
3431 }
3432
3433 /* Copy event list into message payload */
3434 memcpy(cmd_ctx->llm->payload, channels,
3435 nb_chan * sizeof(struct lttng_channel));
3436
3437 free(channels);
3438
3439 ret = LTTCOMM_OK;
3440 break;
3441 }
3442 case LTTNG_LIST_EVENTS:
3443 {
3444 ssize_t nb_event;
3445 struct lttng_event *events = NULL;
3446
3447 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3448 cmd_ctx->lsm->u.list.channel_name, &events);
3449 if (nb_event < 0) {
3450 ret = -nb_event;
3451 goto error;
3452 }
3453
3454 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3455 if (ret < 0) {
3456 goto setup_error;
3457 }
3458
3459 /* Copy event list into message payload */
3460 memcpy(cmd_ctx->llm->payload, events,
3461 nb_event * sizeof(struct lttng_event));
3462
3463 free(events);
3464
3465 ret = LTTCOMM_OK;
3466 break;
3467 }
3468 case LTTNG_LIST_SESSIONS:
3469 {
3470 unsigned int nr_sessions;
3471
3472 session_lock_list();
3473 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3474 if (nr_sessions == 0) {
3475 ret = LTTCOMM_NO_SESSION;
3476 session_unlock_list();
3477 goto error;
3478 }
3479 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3480 if (ret < 0) {
3481 session_unlock_list();
3482 goto setup_error;
3483 }
3484
3485 /* Filled the session array */
3486 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3487 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3488
3489 session_unlock_list();
3490
3491 ret = LTTCOMM_OK;
3492 break;
3493 }
3494 case LTTNG_CALIBRATE:
3495 {
3496 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3497 &cmd_ctx->lsm->u.calibrate);
3498 break;
3499 }
3500 case LTTNG_REGISTER_CONSUMER:
3501 {
3502 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3503 cmd_ctx->lsm->u.reg.path);
3504 break;
3505 }
3506 default:
3507 ret = LTTCOMM_UND;
3508 break;
3509 }
3510
3511 error:
3512 if (cmd_ctx->llm == NULL) {
3513 DBG("Missing llm structure. Allocating one.");
3514 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3515 goto setup_error;
3516 }
3517 }
3518 /* Set return code */
3519 cmd_ctx->llm->ret_code = ret;
3520 setup_error:
3521 if (cmd_ctx->session) {
3522 session_unlock(cmd_ctx->session);
3523 }
3524 init_setup_error:
3525 return ret;
3526 }
3527
3528 /*
3529 * This thread manage all clients request using the unix client socket for
3530 * communication.
3531 */
3532 static void *thread_manage_clients(void *data)
3533 {
3534 int sock = 0, ret, i, pollfd;
3535 uint32_t revents, nb_fd;
3536 struct command_ctx *cmd_ctx = NULL;
3537 struct lttng_poll_event events;
3538
3539 DBG("[thread] Manage client started");
3540
3541 rcu_register_thread();
3542
3543 ret = lttcomm_listen_unix_sock(client_sock);
3544 if (ret < 0) {
3545 goto error;
3546 }
3547
3548 /*
3549 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3550 * more will be added to this poll set.
3551 */
3552 ret = create_thread_poll_set(&events, 2);
3553 if (ret < 0) {
3554 goto error;
3555 }
3556
3557 /* Add the application registration socket */
3558 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3559 if (ret < 0) {
3560 goto error;
3561 }
3562
3563 /*
3564 * Notify parent pid that we are ready to accept command for client side.
3565 */
3566 if (opt_sig_parent) {
3567 kill(ppid, SIGUSR1);
3568 }
3569
3570 while (1) {
3571 DBG("Accepting client command ...");
3572
3573 nb_fd = LTTNG_POLL_GETNB(&events);
3574
3575 /* Inifinite blocking call, waiting for transmission */
3576 ret = lttng_poll_wait(&events, -1);
3577 if (ret < 0) {
3578 goto error;
3579 }
3580
3581 for (i = 0; i < nb_fd; i++) {
3582 /* Fetch once the poll data */
3583 revents = LTTNG_POLL_GETEV(&events, i);
3584 pollfd = LTTNG_POLL_GETFD(&events, i);
3585
3586 /* Thread quit pipe has been closed. Killing thread. */
3587 ret = check_thread_quit_pipe(pollfd, revents);
3588 if (ret) {
3589 goto error;
3590 }
3591
3592 /* Event on the registration socket */
3593 if (pollfd == client_sock) {
3594 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3595 ERR("Client socket poll error");
3596 goto error;
3597 }
3598 }
3599 }
3600
3601 DBG("Wait for client response");
3602
3603 sock = lttcomm_accept_unix_sock(client_sock);
3604 if (sock < 0) {
3605 goto error;
3606 }
3607
3608 /* Set socket option for credentials retrieval */
3609 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3610 if (ret < 0) {
3611 goto error;
3612 }
3613
3614 /* Allocate context command to process the client request */
3615 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3616 if (cmd_ctx == NULL) {
3617 perror("zmalloc cmd_ctx");
3618 goto error;
3619 }
3620
3621 /* Allocate data buffer for reception */
3622 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3623 if (cmd_ctx->lsm == NULL) {
3624 perror("zmalloc cmd_ctx->lsm");
3625 goto error;
3626 }
3627
3628 cmd_ctx->llm = NULL;
3629 cmd_ctx->session = NULL;
3630
3631 /*
3632 * Data is received from the lttng client. The struct
3633 * lttcomm_session_msg (lsm) contains the command and data request of
3634 * the client.
3635 */
3636 DBG("Receiving data from client ...");
3637 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3638 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3639 if (ret <= 0) {
3640 DBG("Nothing recv() from client... continuing");
3641 close(sock);
3642 free(cmd_ctx);
3643 continue;
3644 }
3645
3646 // TODO: Validate cmd_ctx including sanity check for
3647 // security purpose.
3648
3649 rcu_thread_online();
3650 /*
3651 * This function dispatch the work to the kernel or userspace tracer
3652 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3653 * informations for the client. The command context struct contains
3654 * everything this function may needs.
3655 */
3656 ret = process_client_msg(cmd_ctx);
3657 rcu_thread_offline();
3658 if (ret < 0) {
3659 /*
3660 * TODO: Inform client somehow of the fatal error. At
3661 * this point, ret < 0 means that a zmalloc failed
3662 * (ENOMEM). Error detected but still accept command.
3663 */
3664 clean_command_ctx(&cmd_ctx);
3665 continue;
3666 }
3667
3668 DBG("Sending response (size: %d, retcode: %s)",
3669 cmd_ctx->lttng_msg_size,
3670 lttng_strerror(-cmd_ctx->llm->ret_code));
3671 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3672 if (ret < 0) {
3673 ERR("Failed to send data back to client");
3674 }
3675
3676 /* End of transmission */
3677 close(sock);
3678
3679 clean_command_ctx(&cmd_ctx);
3680 }
3681
3682 error:
3683 DBG("Client thread dying");
3684 unlink(client_unix_sock_path);
3685 close(client_sock);
3686 close(sock);
3687
3688 lttng_poll_clean(&events);
3689 clean_command_ctx(&cmd_ctx);
3690
3691 rcu_unregister_thread();
3692 return NULL;
3693 }
3694
3695
3696 /*
3697 * usage function on stderr
3698 */
3699 static void usage(void)
3700 {
3701 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3702 fprintf(stderr, " -h, --help Display this usage.\n");
3703 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3704 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3705 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3706 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3707 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3708 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3709 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3710 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3711 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3712 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3713 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3714 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3715 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3716 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3717 fprintf(stderr, " -V, --version Show version number.\n");
3718 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3719 fprintf(stderr, " -q, --quiet No output at all.\n");
3720 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3721 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3722 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3723 }
3724
3725 /*
3726 * daemon argument parsing
3727 */
3728 static int parse_args(int argc, char **argv)
3729 {
3730 int c;
3731
3732 static struct option long_options[] = {
3733 { "client-sock", 1, 0, 'c' },
3734 { "apps-sock", 1, 0, 'a' },
3735 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3736 { "kconsumerd-err-sock", 1, 0, 'E' },
3737 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3738 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3739 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3740 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3741 { "consumerd32-path", 1, 0, 'u' },
3742 { "consumerd32-libdir", 1, 0, 'U' },
3743 { "consumerd64-path", 1, 0, 't' },
3744 { "consumerd64-libdir", 1, 0, 'T' },
3745 { "daemonize", 0, 0, 'd' },
3746 { "sig-parent", 0, 0, 'S' },
3747 { "help", 0, 0, 'h' },
3748 { "group", 1, 0, 'g' },
3749 { "version", 0, 0, 'V' },
3750 { "quiet", 0, 0, 'q' },
3751 { "verbose", 0, 0, 'v' },
3752 { "verbose-consumer", 0, 0, 'Z' },
3753 { "no-kernel", 0, 0, 'N' },
3754 { NULL, 0, 0, 0 }
3755 };
3756
3757 while (1) {
3758 int option_index = 0;
3759 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3760 long_options, &option_index);
3761 if (c == -1) {
3762 break;
3763 }
3764
3765 switch (c) {
3766 case 0:
3767 fprintf(stderr, "option %s", long_options[option_index].name);
3768 if (optarg) {
3769 fprintf(stderr, " with arg %s\n", optarg);
3770 }
3771 break;
3772 case 'c':
3773 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3774 break;
3775 case 'a':
3776 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3777 break;
3778 case 'd':
3779 opt_daemon = 1;
3780 break;
3781 case 'g':
3782 opt_tracing_group = optarg;
3783 break;
3784 case 'h':
3785 usage();
3786 exit(EXIT_FAILURE);
3787 case 'V':
3788 fprintf(stdout, "%s\n", VERSION);
3789 exit(EXIT_SUCCESS);
3790 case 'S':
3791 opt_sig_parent = 1;
3792 break;
3793 case 'E':
3794 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3795 break;
3796 case 'C':
3797 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3798 break;
3799 case 'F':
3800 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3801 break;
3802 case 'D':
3803 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3804 break;
3805 case 'H':
3806 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3807 break;
3808 case 'G':
3809 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3810 break;
3811 case 'N':
3812 opt_no_kernel = 1;
3813 break;
3814 case 'q':
3815 opt_quiet = 1;
3816 break;
3817 case 'v':
3818 /* Verbose level can increase using multiple -v */
3819 opt_verbose += 1;
3820 break;
3821 case 'Z':
3822 opt_verbose_consumer += 1;
3823 break;
3824 case 'u':
3825 consumerd32_bin= optarg;
3826 break;
3827 case 'U':
3828 consumerd32_libdir = optarg;
3829 break;
3830 case 't':
3831 consumerd64_bin = optarg;
3832 break;
3833 case 'T':
3834 consumerd64_libdir = optarg;
3835 break;
3836 default:
3837 /* Unknown option or other error.
3838 * Error is printed by getopt, just return */
3839 return -1;
3840 }
3841 }
3842
3843 return 0;
3844 }
3845
3846 /*
3847 * Creates the two needed socket by the daemon.
3848 * apps_sock - The communication socket for all UST apps.
3849 * client_sock - The communication of the cli tool (lttng).
3850 */
3851 static int init_daemon_socket(void)
3852 {
3853 int ret = 0;
3854 mode_t old_umask;
3855
3856 old_umask = umask(0);
3857
3858 /* Create client tool unix socket */
3859 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3860 if (client_sock < 0) {
3861 ERR("Create unix sock failed: %s", client_unix_sock_path);
3862 ret = -1;
3863 goto end;
3864 }
3865
3866 /* File permission MUST be 660 */
3867 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3868 if (ret < 0) {
3869 ERR("Set file permissions failed: %s", client_unix_sock_path);
3870 perror("chmod");
3871 goto end;
3872 }
3873
3874 /* Create the application unix socket */
3875 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3876 if (apps_sock < 0) {
3877 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3878 ret = -1;
3879 goto end;
3880 }
3881
3882 /* File permission MUST be 666 */
3883 ret = chmod(apps_unix_sock_path,
3884 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3885 if (ret < 0) {
3886 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3887 perror("chmod");
3888 goto end;
3889 }
3890
3891 end:
3892 umask(old_umask);
3893 return ret;
3894 }
3895
3896 /*
3897 * Check if the global socket is available, and if a daemon is answering at the
3898 * other side. If yes, error is returned.
3899 */
3900 static int check_existing_daemon(void)
3901 {
3902 if (access(client_unix_sock_path, F_OK) < 0 &&
3903 access(apps_unix_sock_path, F_OK) < 0) {
3904 return 0;
3905 }
3906
3907 /* Is there anybody out there ? */
3908 if (lttng_session_daemon_alive()) {
3909 return -EEXIST;
3910 } else {
3911 return 0;
3912 }
3913 }
3914
3915 /*
3916 * Set the tracing group gid onto the client socket.
3917 *
3918 * Race window between mkdir and chown is OK because we are going from more
3919 * permissive (root.root) to les permissive (root.tracing).
3920 */
3921 static int set_permissions(char *rundir)
3922 {
3923 int ret;
3924 gid_t gid;
3925
3926 gid = allowed_group();
3927 if (gid < 0) {
3928 WARN("No tracing group detected");
3929 ret = 0;
3930 goto end;
3931 }
3932
3933 /* Set lttng run dir */
3934 ret = chown(rundir, 0, gid);
3935 if (ret < 0) {
3936 ERR("Unable to set group on %s", rundir);
3937 perror("chown");
3938 }
3939
3940 /* lttng client socket path */
3941 ret = chown(client_unix_sock_path, 0, gid);
3942 if (ret < 0) {
3943 ERR("Unable to set group on %s", client_unix_sock_path);
3944 perror("chown");
3945 }
3946
3947 /* kconsumer error socket path */
3948 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3949 if (ret < 0) {
3950 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3951 perror("chown");
3952 }
3953
3954 /* 64-bit ustconsumer error socket path */
3955 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3956 if (ret < 0) {
3957 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3958 perror("chown");
3959 }
3960
3961 /* 32-bit ustconsumer compat32 error socket path */
3962 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3963 if (ret < 0) {
3964 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3965 perror("chown");
3966 }
3967
3968 DBG("All permissions are set");
3969
3970 end:
3971 return ret;
3972 }
3973
3974 /*
3975 * Create the pipe used to wake up the kernel thread.
3976 */
3977 static int create_kernel_poll_pipe(void)
3978 {
3979 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3980 }
3981
3982 /*
3983 * Create the application command pipe to wake thread_manage_apps.
3984 */
3985 static int create_apps_cmd_pipe(void)
3986 {
3987 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3988 }
3989
3990 /*
3991 * Create the lttng run directory needed for all global sockets and pipe.
3992 */
3993 static int create_lttng_rundir(const char *rundir)
3994 {
3995 int ret;
3996
3997 DBG3("Creating LTTng run directory: %s", rundir);
3998
3999 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
4000 if (ret < 0) {
4001 if (errno != EEXIST) {
4002 ERR("Unable to create %s", rundir);
4003 goto error;
4004 } else {
4005 ret = 0;
4006 }
4007 }
4008
4009 error:
4010 return ret;
4011 }
4012
4013 /*
4014 * Setup sockets and directory needed by the kconsumerd communication with the
4015 * session daemon.
4016 */
4017 static int set_consumer_sockets(struct consumer_data *consumer_data,
4018 const char *rundir)
4019 {
4020 int ret;
4021 char path[PATH_MAX];
4022
4023 switch (consumer_data->type) {
4024 case LTTNG_CONSUMER_KERNEL:
4025 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4026 break;
4027 case LTTNG_CONSUMER64_UST:
4028 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4029 break;
4030 case LTTNG_CONSUMER32_UST:
4031 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4032 break;
4033 default:
4034 ERR("Consumer type unknown");
4035 ret = -EINVAL;
4036 goto error;
4037 }
4038
4039 DBG2("Creating consumer directory: %s", path);
4040
4041 ret = mkdir(path, S_IRWXU | S_IRWXG);
4042 if (ret < 0) {
4043 if (errno != EEXIST) {
4044 ERR("Failed to create %s", path);
4045 goto error;
4046 }
4047 ret = 0;
4048 }
4049
4050 /* Create the kconsumerd error unix socket */
4051 consumer_data->err_sock =
4052 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4053 if (consumer_data->err_sock < 0) {
4054 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4055 ret = -1;
4056 goto error;
4057 }
4058
4059 /* File permission MUST be 660 */
4060 ret = chmod(consumer_data->err_unix_sock_path,
4061 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4062 if (ret < 0) {
4063 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4064 PERROR("chmod");
4065 goto error;
4066 }
4067
4068 error:
4069 return ret;
4070 }
4071
4072 /*
4073 * Signal handler for the daemon
4074 *
4075 * Simply stop all worker threads, leaving main() return gracefully after
4076 * joining all threads and calling cleanup().
4077 */
4078 static void sighandler(int sig)
4079 {
4080 switch (sig) {
4081 case SIGPIPE:
4082 DBG("SIGPIPE caught");
4083 return;
4084 case SIGINT:
4085 DBG("SIGINT caught");
4086 stop_threads();
4087 break;
4088 case SIGTERM:
4089 DBG("SIGTERM caught");
4090 stop_threads();
4091 break;
4092 default:
4093 break;
4094 }
4095 }
4096
4097 /*
4098 * Setup signal handler for :
4099 * SIGINT, SIGTERM, SIGPIPE
4100 */
4101 static int set_signal_handler(void)
4102 {
4103 int ret = 0;
4104 struct sigaction sa;
4105 sigset_t sigset;
4106
4107 if ((ret = sigemptyset(&sigset)) < 0) {
4108 perror("sigemptyset");
4109 return ret;
4110 }
4111
4112 sa.sa_handler = sighandler;
4113 sa.sa_mask = sigset;
4114 sa.sa_flags = 0;
4115 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4116 perror("sigaction");
4117 return ret;
4118 }
4119
4120 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4121 perror("sigaction");
4122 return ret;
4123 }
4124
4125 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4126 perror("sigaction");
4127 return ret;
4128 }
4129
4130 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4131
4132 return ret;
4133 }
4134
4135 /*
4136 * Set open files limit to unlimited. This daemon can open a large number of
4137 * file descriptors in order to consumer multiple kernel traces.
4138 */
4139 static void set_ulimit(void)
4140 {
4141 int ret;
4142 struct rlimit lim;
4143
4144 /* The kernel does not allowed an infinite limit for open files */
4145 lim.rlim_cur = 65535;
4146 lim.rlim_max = 65535;
4147
4148 ret = setrlimit(RLIMIT_NOFILE, &lim);
4149 if (ret < 0) {
4150 perror("failed to set open files limit");
4151 }
4152 }
4153
4154 /*
4155 * main
4156 */
4157 int main(int argc, char **argv)
4158 {
4159 int ret = 0;
4160 void *status;
4161 const char *home_path;
4162
4163 init_kernel_workarounds();
4164
4165 rcu_register_thread();
4166
4167 /* Create thread quit pipe */
4168 if ((ret = init_thread_quit_pipe()) < 0) {
4169 goto error;
4170 }
4171
4172 setup_consumerd_path();
4173
4174 /* Parse arguments */
4175 progname = argv[0];
4176 if ((ret = parse_args(argc, argv) < 0)) {
4177 goto error;
4178 }
4179
4180 /* Daemonize */
4181 if (opt_daemon) {
4182 ret = daemon(0, 0);
4183 if (ret < 0) {
4184 perror("daemon");
4185 goto error;
4186 }
4187 }
4188
4189 /* Check if daemon is UID = 0 */
4190 is_root = !getuid();
4191
4192 if (is_root) {
4193 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4194
4195 /* Create global run dir with root access */
4196 ret = create_lttng_rundir(rundir);
4197 if (ret < 0) {
4198 goto error;
4199 }
4200
4201 if (strlen(apps_unix_sock_path) == 0) {
4202 snprintf(apps_unix_sock_path, PATH_MAX,
4203 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4204 }
4205
4206 if (strlen(client_unix_sock_path) == 0) {
4207 snprintf(client_unix_sock_path, PATH_MAX,
4208 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4209 }
4210
4211 /* Set global SHM for ust */
4212 if (strlen(wait_shm_path) == 0) {
4213 snprintf(wait_shm_path, PATH_MAX,
4214 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4215 }
4216
4217 /* Setup kernel consumerd path */
4218 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4219 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4220 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4221 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4222
4223 DBG2("Kernel consumer err path: %s",
4224 kconsumer_data.err_unix_sock_path);
4225 DBG2("Kernel consumer cmd path: %s",
4226 kconsumer_data.cmd_unix_sock_path);
4227 } else {
4228 home_path = get_home_dir();
4229 if (home_path == NULL) {
4230 /* TODO: Add --socket PATH option */
4231 ERR("Can't get HOME directory for sockets creation.");
4232 ret = -EPERM;
4233 goto error;
4234 }
4235
4236 /*
4237 * Create rundir from home path. This will create something like
4238 * $HOME/.lttng
4239 */
4240 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4241 if (ret < 0) {
4242 ret = -ENOMEM;
4243 goto error;
4244 }
4245
4246 ret = create_lttng_rundir(rundir);
4247 if (ret < 0) {
4248 goto error;
4249 }
4250
4251 if (strlen(apps_unix_sock_path) == 0) {
4252 snprintf(apps_unix_sock_path, PATH_MAX,
4253 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4254 }
4255
4256 /* Set the cli tool unix socket path */
4257 if (strlen(client_unix_sock_path) == 0) {
4258 snprintf(client_unix_sock_path, PATH_MAX,
4259 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4260 }
4261
4262 /* Set global SHM for ust */
4263 if (strlen(wait_shm_path) == 0) {
4264 snprintf(wait_shm_path, PATH_MAX,
4265 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4266 }
4267 }
4268
4269 DBG("Client socket path %s", client_unix_sock_path);
4270 DBG("Application socket path %s", apps_unix_sock_path);
4271 DBG("LTTng run directory path: %s", rundir);
4272
4273 /* 32 bits consumerd path setup */
4274 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4275 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4276 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4277 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4278
4279 DBG2("UST consumer 32 bits err path: %s",
4280 ustconsumer32_data.err_unix_sock_path);
4281 DBG2("UST consumer 32 bits cmd path: %s",
4282 ustconsumer32_data.cmd_unix_sock_path);
4283
4284 /* 64 bits consumerd path setup */
4285 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4286 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4287 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4288 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4289
4290 DBG2("UST consumer 64 bits err path: %s",
4291 ustconsumer64_data.err_unix_sock_path);
4292 DBG2("UST consumer 64 bits cmd path: %s",
4293 ustconsumer64_data.cmd_unix_sock_path);
4294
4295 /*
4296 * See if daemon already exist.
4297 */
4298 if ((ret = check_existing_daemon()) < 0) {
4299 ERR("Already running daemon.\n");
4300 /*
4301 * We do not goto exit because we must not cleanup()
4302 * because a daemon is already running.
4303 */
4304 goto error;
4305 }
4306
4307 /* After this point, we can safely call cleanup() with "goto exit" */
4308
4309 /*
4310 * These actions must be executed as root. We do that *after* setting up
4311 * the sockets path because we MUST make the check for another daemon using
4312 * those paths *before* trying to set the kernel consumer sockets and init
4313 * kernel tracer.
4314 */
4315 if (is_root) {
4316 ret = set_consumer_sockets(&kconsumer_data, rundir);
4317 if (ret < 0) {
4318 goto exit;
4319 }
4320
4321 /* Setup kernel tracer */
4322 if (!opt_no_kernel) {
4323 init_kernel_tracer();
4324 }
4325
4326 /* Set ulimit for open files */
4327 set_ulimit();
4328 }
4329
4330 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4331 if (ret < 0) {
4332 goto exit;
4333 }
4334
4335 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4336 if (ret < 0) {
4337 goto exit;
4338 }
4339
4340 if ((ret = set_signal_handler()) < 0) {
4341 goto exit;
4342 }
4343
4344 /* Setup the needed unix socket */
4345 if ((ret = init_daemon_socket()) < 0) {
4346 goto exit;
4347 }
4348
4349 /* Set credentials to socket */
4350 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4351 goto exit;
4352 }
4353
4354 /* Get parent pid if -S, --sig-parent is specified. */
4355 if (opt_sig_parent) {
4356 ppid = getppid();
4357 }
4358
4359 /* Setup the kernel pipe for waking up the kernel thread */
4360 if ((ret = create_kernel_poll_pipe()) < 0) {
4361 goto exit;
4362 }
4363
4364 /* Setup the thread apps communication pipe. */
4365 if ((ret = create_apps_cmd_pipe()) < 0) {
4366 goto exit;
4367 }
4368
4369 /* Init UST command queue. */
4370 cds_wfq_init(&ust_cmd_queue.queue);
4371
4372 /* Init UST app hash table */
4373 ust_app_ht_alloc();
4374
4375 /*
4376 * Get session list pointer. This pointer MUST NOT be free(). This list is
4377 * statically declared in session.c
4378 */
4379 session_list_ptr = session_get_list();
4380
4381 /* Set up max poll set size */
4382 lttng_poll_set_max_size();
4383
4384 /* Create thread to manage the client socket */
4385 ret = pthread_create(&client_thread, NULL,
4386 thread_manage_clients, (void *) NULL);
4387 if (ret != 0) {
4388 perror("pthread_create clients");
4389 goto exit_client;
4390 }
4391
4392 /* Create thread to dispatch registration */
4393 ret = pthread_create(&dispatch_thread, NULL,
4394 thread_dispatch_ust_registration, (void *) NULL);
4395 if (ret != 0) {
4396 perror("pthread_create dispatch");
4397 goto exit_dispatch;
4398 }
4399
4400 /* Create thread to manage application registration. */
4401 ret = pthread_create(&reg_apps_thread, NULL,
4402 thread_registration_apps, (void *) NULL);
4403 if (ret != 0) {
4404 perror("pthread_create registration");
4405 goto exit_reg_apps;
4406 }
4407
4408 /* Create thread to manage application socket */
4409 ret = pthread_create(&apps_thread, NULL,
4410 thread_manage_apps, (void *) NULL);
4411 if (ret != 0) {
4412 perror("pthread_create apps");
4413 goto exit_apps;
4414 }
4415
4416 /* Create kernel thread to manage kernel event */
4417 ret = pthread_create(&kernel_thread, NULL,
4418 thread_manage_kernel, (void *) NULL);
4419 if (ret != 0) {
4420 perror("pthread_create kernel");
4421 goto exit_kernel;
4422 }
4423
4424 ret = pthread_join(kernel_thread, &status);
4425 if (ret != 0) {
4426 perror("pthread_join");
4427 goto error; /* join error, exit without cleanup */
4428 }
4429
4430 exit_kernel:
4431 ret = pthread_join(apps_thread, &status);
4432 if (ret != 0) {
4433 perror("pthread_join");
4434 goto error; /* join error, exit without cleanup */
4435 }
4436
4437 exit_apps:
4438 ret = pthread_join(reg_apps_thread, &status);
4439 if (ret != 0) {
4440 perror("pthread_join");
4441 goto error; /* join error, exit without cleanup */
4442 }
4443
4444 exit_reg_apps:
4445 ret = pthread_join(dispatch_thread, &status);
4446 if (ret != 0) {
4447 perror("pthread_join");
4448 goto error; /* join error, exit without cleanup */
4449 }
4450
4451 exit_dispatch:
4452 ret = pthread_join(client_thread, &status);
4453 if (ret != 0) {
4454 perror("pthread_join");
4455 goto error; /* join error, exit without cleanup */
4456 }
4457
4458 ret = join_consumer_thread(&kconsumer_data);
4459 if (ret != 0) {
4460 perror("join_consumer");
4461 goto error; /* join error, exit without cleanup */
4462 }
4463
4464 exit_client:
4465 exit:
4466 /*
4467 * cleanup() is called when no other thread is running.
4468 */
4469 rcu_thread_online();
4470 cleanup();
4471 rcu_thread_offline();
4472 rcu_unregister_thread();
4473 if (!ret) {
4474 exit(EXIT_SUCCESS);
4475 }
4476 error:
4477 exit(EXIT_FAILURE);
4478 }
LTTng 2.0 tools and control repository
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