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Disable lttng ust domain not implemented
[lttng-tools.git] / src / bin / lttng-sessiond / main.c
1 /*
2 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the Free
7 * Software Foundation; only version 2 of the License.
8 *
9 * This program is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307, USA.
17 */
18
19 #define _GNU_SOURCE
20 #include <fcntl.h>
21 #include <getopt.h>
22 #include <grp.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <semaphore.h>
26 #include <signal.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <sys/mman.h>
31 #include <sys/mount.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
34 #include <sys/stat.h>
35 #include <sys/types.h>
36 #include <sys/wait.h>
37 #include <urcu/futex.h>
38 #include <unistd.h>
39 #include <config.h>
40
41 #include <common/common.h>
42 #include <common/compat/poll.h>
43 #include <common/defaults.h>
44 #include <common/kernel-consumer/kernel-consumer.h>
45 #include <common/ust-consumer/ust-consumer.h>
46
47 #include "lttng-sessiond.h"
48 #include "channel.h"
49 #include "context.h"
50 #include "event.h"
51 #include "futex.h"
52 #include "kernel.h"
53 #include "modprobe.h"
54 #include "shm.h"
55 #include "ust-ctl.h"
56 #include "utils.h"
57
58 #define CONSUMERD_FILE "lttng-consumerd"
59
60 struct consumer_data {
61 enum lttng_consumer_type type;
62
63 pthread_t thread; /* Worker thread interacting with the consumer */
64 sem_t sem;
65
66 /* Mutex to control consumerd pid assignation */
67 pthread_mutex_t pid_mutex;
68 pid_t pid;
69
70 int err_sock;
71 int cmd_sock;
72
73 /* consumer error and command Unix socket path */
74 char err_unix_sock_path[PATH_MAX];
75 char cmd_unix_sock_path[PATH_MAX];
76 };
77
78 /* Const values */
79 const char default_home_dir[] = DEFAULT_HOME_DIR;
80 const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP;
81 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
82 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
83
84 /* Variables */
85 int opt_verbose; /* Not static for lttngerr.h */
86 int opt_verbose_consumer; /* Not static for lttngerr.h */
87 int opt_quiet; /* Not static for lttngerr.h */
88
89 const char *progname;
90 const char *opt_tracing_group;
91 static int opt_sig_parent;
92 static int opt_daemon;
93 static int opt_no_kernel;
94 static int is_root; /* Set to 1 if the daemon is running as root */
95 static pid_t ppid; /* Parent PID for --sig-parent option */
96 static char *rundir;
97
98 /* Consumer daemon specific control data */
99 static struct consumer_data kconsumer_data = {
100 .type = LTTNG_CONSUMER_KERNEL,
101 .err_unix_sock_path = DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
102 .cmd_unix_sock_path = DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
103 };
104 static struct consumer_data ustconsumer64_data = {
105 .type = LTTNG_CONSUMER64_UST,
106 .err_unix_sock_path = DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH,
107 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH,
108 };
109 static struct consumer_data ustconsumer32_data = {
110 .type = LTTNG_CONSUMER32_UST,
111 .err_unix_sock_path = DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH,
112 .cmd_unix_sock_path = DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH,
113 };
114
115 static int dispatch_thread_exit;
116
117 /* Global application Unix socket path */
118 static char apps_unix_sock_path[PATH_MAX];
119 /* Global client Unix socket path */
120 static char client_unix_sock_path[PATH_MAX];
121 /* global wait shm path for UST */
122 static char wait_shm_path[PATH_MAX];
123
124 /* Sockets and FDs */
125 static int client_sock;
126 static int apps_sock;
127 static int kernel_tracer_fd;
128 static int kernel_poll_pipe[2];
129
130 /*
131 * Quit pipe for all threads. This permits a single cancellation point
132 * for all threads when receiving an event on the pipe.
133 */
134 static int thread_quit_pipe[2];
135
136 /*
137 * This pipe is used to inform the thread managing application communication
138 * that a command is queued and ready to be processed.
139 */
140 static int apps_cmd_pipe[2];
141
142 /* Pthread, Mutexes and Semaphores */
143 static pthread_t apps_thread;
144 static pthread_t reg_apps_thread;
145 static pthread_t client_thread;
146 static pthread_t kernel_thread;
147 static pthread_t dispatch_thread;
148
149
150 /*
151 * UST registration command queue. This queue is tied with a futex and uses a N
152 * wakers / 1 waiter implemented and detailed in futex.c/.h
153 *
154 * The thread_manage_apps and thread_dispatch_ust_registration interact with
155 * this queue and the wait/wake scheme.
156 */
157 static struct ust_cmd_queue ust_cmd_queue;
158
159 /*
160 * Pointer initialized before thread creation.
161 *
162 * This points to the tracing session list containing the session count and a
163 * mutex lock. The lock MUST be taken if you iterate over the list. The lock
164 * MUST NOT be taken if you call a public function in session.c.
165 *
166 * The lock is nested inside the structure: session_list_ptr->lock. Please use
167 * session_lock_list and session_unlock_list for lock acquisition.
168 */
169 static struct ltt_session_list *session_list_ptr;
170
171 int ust_consumerd64_fd = -1;
172 int ust_consumerd32_fd = -1;
173
174 static const char *consumerd32_bin = CONFIG_CONSUMERD32_BIN;
175 static const char *consumerd64_bin = CONFIG_CONSUMERD64_BIN;
176 static const char *consumerd32_libdir = CONFIG_CONSUMERD32_LIBDIR;
177 static const char *consumerd64_libdir = CONFIG_CONSUMERD64_LIBDIR;
178
179 static
180 void setup_consumerd_path(void)
181 {
182 const char *bin, *libdir;
183
184 /*
185 * Allow INSTALL_BIN_PATH to be used as a target path for the
186 * native architecture size consumer if CONFIG_CONSUMER*_PATH
187 * has not been defined.
188 */
189 #if (CAA_BITS_PER_LONG == 32)
190 if (!consumerd32_bin[0]) {
191 consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
192 }
193 if (!consumerd32_libdir[0]) {
194 consumerd32_libdir = INSTALL_LIB_PATH;
195 }
196 #elif (CAA_BITS_PER_LONG == 64)
197 if (!consumerd64_bin[0]) {
198 consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
199 }
200 if (!consumerd64_libdir[0]) {
201 consumerd64_libdir = INSTALL_LIB_PATH;
202 }
203 #else
204 #error "Unknown bitness"
205 #endif
206
207 /*
208 * runtime env. var. overrides the build default.
209 */
210 bin = getenv("LTTNG_CONSUMERD32_BIN");
211 if (bin) {
212 consumerd32_bin = bin;
213 }
214 bin = getenv("LTTNG_CONSUMERD64_BIN");
215 if (bin) {
216 consumerd64_bin = bin;
217 }
218 libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR");
219 if (libdir) {
220 consumerd32_libdir = libdir;
221 }
222 libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR");
223 if (libdir) {
224 consumerd64_libdir = libdir;
225 }
226 }
227
228 /*
229 * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set.
230 */
231 static int create_thread_poll_set(struct lttng_poll_event *events,
232 unsigned int size)
233 {
234 int ret;
235
236 if (events == NULL || size == 0) {
237 ret = -1;
238 goto error;
239 }
240
241 ret = lttng_poll_create(events, size, LTTNG_CLOEXEC);
242 if (ret < 0) {
243 goto error;
244 }
245
246 /* Add quit pipe */
247 ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN);
248 if (ret < 0) {
249 goto error;
250 }
251
252 return 0;
253
254 error:
255 return ret;
256 }
257
258 /*
259 * Check if the thread quit pipe was triggered.
260 *
261 * Return 1 if it was triggered else 0;
262 */
263 static int check_thread_quit_pipe(int fd, uint32_t events)
264 {
265 if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) {
266 return 1;
267 }
268
269 return 0;
270 }
271
272 /*
273 * Return group ID of the tracing group or -1 if not found.
274 */
275 static gid_t allowed_group(void)
276 {
277 struct group *grp;
278
279 if (opt_tracing_group) {
280 grp = getgrnam(opt_tracing_group);
281 } else {
282 grp = getgrnam(default_tracing_group);
283 }
284 if (!grp) {
285 return -1;
286 } else {
287 return grp->gr_gid;
288 }
289 }
290
291 /*
292 * Init thread quit pipe.
293 *
294 * Return -1 on error or 0 if all pipes are created.
295 */
296 static int init_thread_quit_pipe(void)
297 {
298 int ret;
299
300 ret = pipe2(thread_quit_pipe, O_CLOEXEC);
301 if (ret < 0) {
302 perror("thread quit pipe");
303 goto error;
304 }
305
306 error:
307 return ret;
308 }
309
310 /*
311 * Complete teardown of a kernel session. This free all data structure related
312 * to a kernel session and update counter.
313 */
314 static void teardown_kernel_session(struct ltt_session *session)
315 {
316 if (!session->kernel_session) {
317 DBG3("No kernel session when tearingdown session");
318 return;
319 }
320
321 DBG("Tearing down kernel session");
322
323 /*
324 * If a custom kernel consumer was registered, close the socket before
325 * tearing down the complete kernel session structure
326 */
327 if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) {
328 lttcomm_close_unix_sock(session->kernel_session->consumer_fd);
329 }
330
331 trace_kernel_destroy_session(session->kernel_session);
332 }
333
334 /*
335 * Complete teardown of all UST sessions. This will free everything on his path
336 * and destroy the core essence of all ust sessions :)
337 */
338 static void teardown_ust_session(struct ltt_session *session)
339 {
340 int ret;
341
342 if (!session->ust_session) {
343 DBG3("No UST session when tearingdown session");
344 return;
345 }
346
347 DBG("Tearing down UST session(s)");
348
349 ret = ust_app_destroy_trace_all(session->ust_session);
350 if (ret) {
351 ERR("Error in ust_app_destroy_trace_all");
352 }
353
354 trace_ust_destroy_session(session->ust_session);
355 }
356
357 /*
358 * Stop all threads by closing the thread quit pipe.
359 */
360 static void stop_threads(void)
361 {
362 int ret;
363
364 /* Stopping all threads */
365 DBG("Terminating all threads");
366 ret = notify_thread_pipe(thread_quit_pipe[1]);
367 if (ret < 0) {
368 ERR("write error on thread quit pipe");
369 }
370
371 /* Dispatch thread */
372 dispatch_thread_exit = 1;
373 futex_nto1_wake(&ust_cmd_queue.futex);
374 }
375
376 /*
377 * Cleanup the daemon
378 */
379 static void cleanup(void)
380 {
381 int ret;
382 char *cmd;
383 struct ltt_session *sess, *stmp;
384
385 DBG("Cleaning up");
386
387 DBG("Removing %s directory", rundir);
388 ret = asprintf(&cmd, "rm -rf %s", rundir);
389 if (ret < 0) {
390 ERR("asprintf failed. Something is really wrong!");
391 }
392
393 /* Remove lttng run directory */
394 ret = system(cmd);
395 if (ret < 0) {
396 ERR("Unable to clean %s", rundir);
397 }
398 free(cmd);
399
400 DBG("Cleaning up all session");
401
402 /* Destroy session list mutex */
403 if (session_list_ptr != NULL) {
404 pthread_mutex_destroy(&session_list_ptr->lock);
405
406 /* Cleanup ALL session */
407 cds_list_for_each_entry_safe(sess, stmp,
408 &session_list_ptr->head, list) {
409 teardown_kernel_session(sess);
410 teardown_ust_session(sess);
411 free(sess);
412 }
413 }
414
415 DBG("Closing all UST sockets");
416 ust_app_clean_list();
417
418 pthread_mutex_destroy(&kconsumer_data.pid_mutex);
419
420 if (is_root && !opt_no_kernel) {
421 DBG2("Closing kernel fd");
422 close(kernel_tracer_fd);
423 DBG("Unloading kernel modules");
424 modprobe_remove_lttng_all();
425 }
426
427 close(thread_quit_pipe[0]);
428 close(thread_quit_pipe[1]);
429
430 /* <fun> */
431 DBG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm"
432 "Matthew, BEET driven development works!%c[%dm",
433 27, 1, 31, 27, 0, 27, 1, 33, 27, 0);
434 /* </fun> */
435 }
436
437 /*
438 * Send data on a unix socket using the liblttsessiondcomm API.
439 *
440 * Return lttcomm error code.
441 */
442 static int send_unix_sock(int sock, void *buf, size_t len)
443 {
444 /* Check valid length */
445 if (len <= 0) {
446 return -1;
447 }
448
449 return lttcomm_send_unix_sock(sock, buf, len);
450 }
451
452 /*
453 * Free memory of a command context structure.
454 */
455 static void clean_command_ctx(struct command_ctx **cmd_ctx)
456 {
457 DBG("Clean command context structure");
458 if (*cmd_ctx) {
459 if ((*cmd_ctx)->llm) {
460 free((*cmd_ctx)->llm);
461 }
462 if ((*cmd_ctx)->lsm) {
463 free((*cmd_ctx)->lsm);
464 }
465 free(*cmd_ctx);
466 *cmd_ctx = NULL;
467 }
468 }
469
470 /*
471 * Send all stream fds of kernel channel to the consumer.
472 */
473 static int send_kconsumer_channel_streams(struct consumer_data *consumer_data,
474 int sock, struct ltt_kernel_channel *channel,
475 uid_t uid, gid_t gid)
476 {
477 int ret;
478 struct ltt_kernel_stream *stream;
479 struct lttcomm_consumer_msg lkm;
480
481 DBG("Sending streams of channel %s to kernel consumer",
482 channel->channel->name);
483
484 /* Send channel */
485 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
486 lkm.u.channel.channel_key = channel->fd;
487 lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size;
488 lkm.u.channel.mmap_len = 0; /* for kernel */
489 DBG("Sending channel %d to consumer", lkm.u.channel.channel_key);
490 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
491 if (ret < 0) {
492 perror("send consumer channel");
493 goto error;
494 }
495
496 /* Send streams */
497 cds_list_for_each_entry(stream, &channel->stream_list.head, list) {
498 if (!stream->fd) {
499 continue;
500 }
501 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
502 lkm.u.stream.channel_key = channel->fd;
503 lkm.u.stream.stream_key = stream->fd;
504 lkm.u.stream.state = stream->state;
505 lkm.u.stream.output = channel->channel->attr.output;
506 lkm.u.stream.mmap_len = 0; /* for kernel */
507 lkm.u.stream.uid = uid;
508 lkm.u.stream.gid = gid;
509 strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1);
510 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
511 DBG("Sending stream %d to consumer", lkm.u.stream.stream_key);
512 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
513 if (ret < 0) {
514 perror("send consumer stream");
515 goto error;
516 }
517 ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1);
518 if (ret < 0) {
519 perror("send consumer stream ancillary data");
520 goto error;
521 }
522 }
523
524 DBG("consumer channel streams sent");
525
526 return 0;
527
528 error:
529 return ret;
530 }
531
532 /*
533 * Send all stream fds of the kernel session to the consumer.
534 */
535 static int send_kconsumer_session_streams(struct consumer_data *consumer_data,
536 struct ltt_kernel_session *session)
537 {
538 int ret;
539 struct ltt_kernel_channel *chan;
540 struct lttcomm_consumer_msg lkm;
541 int sock = session->consumer_fd;
542
543 DBG("Sending metadata stream fd");
544
545 /* Extra protection. It's NOT supposed to be set to 0 at this point */
546 if (session->consumer_fd == 0) {
547 session->consumer_fd = consumer_data->cmd_sock;
548 }
549
550 if (session->metadata_stream_fd != 0) {
551 /* Send metadata channel fd */
552 lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
553 lkm.u.channel.channel_key = session->metadata->fd;
554 lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size;
555 lkm.u.channel.mmap_len = 0; /* for kernel */
556 DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key);
557 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
558 if (ret < 0) {
559 perror("send consumer channel");
560 goto error;
561 }
562
563 /* Send metadata stream fd */
564 lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
565 lkm.u.stream.channel_key = session->metadata->fd;
566 lkm.u.stream.stream_key = session->metadata_stream_fd;
567 lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
568 lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
569 lkm.u.stream.mmap_len = 0; /* for kernel */
570 lkm.u.stream.uid = session->uid;
571 lkm.u.stream.gid = session->gid;
572 strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1);
573 lkm.u.stream.path_name[PATH_MAX - 1] = '\0';
574 DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key);
575 ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm));
576 if (ret < 0) {
577 perror("send consumer stream");
578 goto error;
579 }
580 ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1);
581 if (ret < 0) {
582 perror("send consumer stream");
583 goto error;
584 }
585 }
586
587 cds_list_for_each_entry(chan, &session->channel_list.head, list) {
588 ret = send_kconsumer_channel_streams(consumer_data, sock, chan,
589 session->uid, session->gid);
590 if (ret < 0) {
591 goto error;
592 }
593 }
594
595 DBG("consumer fds (metadata and channel streams) sent");
596
597 return 0;
598
599 error:
600 return ret;
601 }
602
603 /*
604 * Notify UST applications using the shm mmap futex.
605 */
606 static int notify_ust_apps(int active)
607 {
608 char *wait_shm_mmap;
609
610 DBG("Notifying applications of session daemon state: %d", active);
611
612 /* See shm.c for this call implying mmap, shm and futex calls */
613 wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root);
614 if (wait_shm_mmap == NULL) {
615 goto error;
616 }
617
618 /* Wake waiting process */
619 futex_wait_update((int32_t *) wait_shm_mmap, active);
620
621 /* Apps notified successfully */
622 return 0;
623
624 error:
625 return -1;
626 }
627
628 /*
629 * Setup the outgoing data buffer for the response (llm) by allocating the
630 * right amount of memory and copying the original information from the lsm
631 * structure.
632 *
633 * Return total size of the buffer pointed by buf.
634 */
635 static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size)
636 {
637 int ret, buf_size;
638
639 buf_size = size;
640
641 cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size);
642 if (cmd_ctx->llm == NULL) {
643 perror("zmalloc");
644 ret = -ENOMEM;
645 goto error;
646 }
647
648 /* Copy common data */
649 cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type;
650 cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid;
651
652 cmd_ctx->llm->data_size = size;
653 cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size;
654
655 return buf_size;
656
657 error:
658 return ret;
659 }
660
661 /*
662 * Update the kernel poll set of all channel fd available over all tracing
663 * session. Add the wakeup pipe at the end of the set.
664 */
665 static int update_kernel_poll(struct lttng_poll_event *events)
666 {
667 int ret;
668 struct ltt_session *session;
669 struct ltt_kernel_channel *channel;
670
671 DBG("Updating kernel poll set");
672
673 session_lock_list();
674 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
675 session_lock(session);
676 if (session->kernel_session == NULL) {
677 session_unlock(session);
678 continue;
679 }
680
681 cds_list_for_each_entry(channel,
682 &session->kernel_session->channel_list.head, list) {
683 /* Add channel fd to the kernel poll set */
684 ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM);
685 if (ret < 0) {
686 session_unlock(session);
687 goto error;
688 }
689 DBG("Channel fd %d added to kernel set", channel->fd);
690 }
691 session_unlock(session);
692 }
693 session_unlock_list();
694
695 return 0;
696
697 error:
698 session_unlock_list();
699 return -1;
700 }
701
702 /*
703 * Find the channel fd from 'fd' over all tracing session. When found, check
704 * for new channel stream and send those stream fds to the kernel consumer.
705 *
706 * Useful for CPU hotplug feature.
707 */
708 static int update_kernel_stream(struct consumer_data *consumer_data, int fd)
709 {
710 int ret = 0;
711 struct ltt_session *session;
712 struct ltt_kernel_channel *channel;
713
714 DBG("Updating kernel streams for channel fd %d", fd);
715
716 session_lock_list();
717 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
718 session_lock(session);
719 if (session->kernel_session == NULL) {
720 session_unlock(session);
721 continue;
722 }
723
724 /* This is not suppose to be 0 but this is an extra security check */
725 if (session->kernel_session->consumer_fd == 0) {
726 session->kernel_session->consumer_fd = consumer_data->cmd_sock;
727 }
728
729 cds_list_for_each_entry(channel,
730 &session->kernel_session->channel_list.head, list) {
731 if (channel->fd == fd) {
732 DBG("Channel found, updating kernel streams");
733 ret = kernel_open_channel_stream(channel);
734 if (ret < 0) {
735 goto error;
736 }
737
738 /*
739 * Have we already sent fds to the consumer? If yes, it means
740 * that tracing is started so it is safe to send our updated
741 * stream fds.
742 */
743 if (session->kernel_session->consumer_fds_sent == 1) {
744 ret = send_kconsumer_channel_streams(consumer_data,
745 session->kernel_session->consumer_fd, channel,
746 session->uid, session->gid);
747 if (ret < 0) {
748 goto error;
749 }
750 }
751 goto error;
752 }
753 }
754 session_unlock(session);
755 }
756 session_unlock_list();
757 return ret;
758
759 error:
760 session_unlock(session);
761 session_unlock_list();
762 return ret;
763 }
764
765 /*
766 * For each tracing session, update newly registered apps.
767 */
768 static void update_ust_app(int app_sock)
769 {
770 struct ltt_session *sess, *stmp;
771
772 /* For all tracing session(s) */
773 cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) {
774 if (sess->ust_session) {
775 ust_app_global_update(sess->ust_session, app_sock);
776 }
777 }
778 }
779
780 /*
781 * This thread manage event coming from the kernel.
782 *
783 * Features supported in this thread:
784 * -) CPU Hotplug
785 */
786 static void *thread_manage_kernel(void *data)
787 {
788 int ret, i, pollfd, update_poll_flag = 1;
789 uint32_t revents, nb_fd;
790 char tmp;
791 struct lttng_poll_event events;
792
793 DBG("Thread manage kernel started");
794
795 ret = create_thread_poll_set(&events, 2);
796 if (ret < 0) {
797 goto error;
798 }
799
800 ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN);
801 if (ret < 0) {
802 goto error;
803 }
804
805 while (1) {
806 if (update_poll_flag == 1) {
807 /*
808 * Reset number of fd in the poll set. Always 2 since there is the thread
809 * quit pipe and the kernel pipe.
810 */
811 events.nb_fd = 2;
812
813 ret = update_kernel_poll(&events);
814 if (ret < 0) {
815 goto error;
816 }
817 update_poll_flag = 0;
818 }
819
820 nb_fd = LTTNG_POLL_GETNB(&events);
821
822 DBG("Thread kernel polling on %d fds", nb_fd);
823
824 /* Zeroed the poll events */
825 lttng_poll_reset(&events);
826
827 /* Poll infinite value of time */
828 ret = lttng_poll_wait(&events, -1);
829 if (ret < 0) {
830 goto error;
831 } else if (ret == 0) {
832 /* Should not happen since timeout is infinite */
833 ERR("Return value of poll is 0 with an infinite timeout.\n"
834 "This should not have happened! Continuing...");
835 continue;
836 }
837
838 for (i = 0; i < nb_fd; i++) {
839 /* Fetch once the poll data */
840 revents = LTTNG_POLL_GETEV(&events, i);
841 pollfd = LTTNG_POLL_GETFD(&events, i);
842
843 /* Thread quit pipe has been closed. Killing thread. */
844 ret = check_thread_quit_pipe(pollfd, revents);
845 if (ret) {
846 goto error;
847 }
848
849 /* Check for data on kernel pipe */
850 if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) {
851 ret = read(kernel_poll_pipe[0], &tmp, 1);
852 update_poll_flag = 1;
853 continue;
854 } else {
855 /*
856 * New CPU detected by the kernel. Adding kernel stream to
857 * kernel session and updating the kernel consumer
858 */
859 if (revents & LPOLLIN) {
860 ret = update_kernel_stream(&kconsumer_data, pollfd);
861 if (ret < 0) {
862 continue;
863 }
864 break;
865 /*
866 * TODO: We might want to handle the LPOLLERR | LPOLLHUP
867 * and unregister kernel stream at this point.
868 */
869 }
870 }
871 }
872 }
873
874 error:
875 DBG("Kernel thread dying");
876 close(kernel_poll_pipe[0]);
877 close(kernel_poll_pipe[1]);
878
879 lttng_poll_clean(&events);
880
881 return NULL;
882 }
883
884 /*
885 * This thread manage the consumer error sent back to the session daemon.
886 */
887 static void *thread_manage_consumer(void *data)
888 {
889 int sock = 0, i, ret, pollfd;
890 uint32_t revents, nb_fd;
891 enum lttcomm_return_code code;
892 struct lttng_poll_event events;
893 struct consumer_data *consumer_data = data;
894
895 DBG("[thread] Manage consumer started");
896
897 ret = lttcomm_listen_unix_sock(consumer_data->err_sock);
898 if (ret < 0) {
899 goto error;
900 }
901
902 /*
903 * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock.
904 * Nothing more will be added to this poll set.
905 */
906 ret = create_thread_poll_set(&events, 2);
907 if (ret < 0) {
908 goto error;
909 }
910
911 ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP);
912 if (ret < 0) {
913 goto error;
914 }
915
916 nb_fd = LTTNG_POLL_GETNB(&events);
917
918 /* Inifinite blocking call, waiting for transmission */
919 ret = lttng_poll_wait(&events, -1);
920 if (ret < 0) {
921 goto error;
922 }
923
924 for (i = 0; i < nb_fd; i++) {
925 /* Fetch once the poll data */
926 revents = LTTNG_POLL_GETEV(&events, i);
927 pollfd = LTTNG_POLL_GETFD(&events, i);
928
929 /* Thread quit pipe has been closed. Killing thread. */
930 ret = check_thread_quit_pipe(pollfd, revents);
931 if (ret) {
932 goto error;
933 }
934
935 /* Event on the registration socket */
936 if (pollfd == consumer_data->err_sock) {
937 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
938 ERR("consumer err socket poll error");
939 goto error;
940 }
941 }
942 }
943
944 sock = lttcomm_accept_unix_sock(consumer_data->err_sock);
945 if (sock < 0) {
946 goto error;
947 }
948
949 DBG2("Receiving code from consumer err_sock");
950
951 /* Getting status code from kconsumerd */
952 ret = lttcomm_recv_unix_sock(sock, &code,
953 sizeof(enum lttcomm_return_code));
954 if (ret <= 0) {
955 goto error;
956 }
957
958 if (code == CONSUMERD_COMMAND_SOCK_READY) {
959 consumer_data->cmd_sock =
960 lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path);
961 if (consumer_data->cmd_sock < 0) {
962 sem_post(&consumer_data->sem);
963 PERROR("consumer connect");
964 goto error;
965 }
966 /* Signal condition to tell that the kconsumerd is ready */
967 sem_post(&consumer_data->sem);
968 DBG("consumer command socket ready");
969 } else {
970 ERR("consumer error when waiting for SOCK_READY : %s",
971 lttcomm_get_readable_code(-code));
972 goto error;
973 }
974
975 /* Remove the kconsumerd error sock since we've established a connexion */
976 ret = lttng_poll_del(&events, consumer_data->err_sock);
977 if (ret < 0) {
978 goto error;
979 }
980
981 ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP);
982 if (ret < 0) {
983 goto error;
984 }
985
986 /* Update number of fd */
987 nb_fd = LTTNG_POLL_GETNB(&events);
988
989 /* Inifinite blocking call, waiting for transmission */
990 ret = lttng_poll_wait(&events, -1);
991 if (ret < 0) {
992 goto error;
993 }
994
995 for (i = 0; i < nb_fd; i++) {
996 /* Fetch once the poll data */
997 revents = LTTNG_POLL_GETEV(&events, i);
998 pollfd = LTTNG_POLL_GETFD(&events, i);
999
1000 /* Thread quit pipe has been closed. Killing thread. */
1001 ret = check_thread_quit_pipe(pollfd, revents);
1002 if (ret) {
1003 goto error;
1004 }
1005
1006 /* Event on the kconsumerd socket */
1007 if (pollfd == sock) {
1008 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1009 ERR("consumer err socket second poll error");
1010 goto error;
1011 }
1012 }
1013 }
1014
1015 /* Wait for any kconsumerd error */
1016 ret = lttcomm_recv_unix_sock(sock, &code,
1017 sizeof(enum lttcomm_return_code));
1018 if (ret <= 0) {
1019 ERR("consumer closed the command socket");
1020 goto error;
1021 }
1022
1023 ERR("consumer return code : %s", lttcomm_get_readable_code(-code));
1024
1025 error:
1026 DBG("consumer thread dying");
1027 close(consumer_data->err_sock);
1028 close(consumer_data->cmd_sock);
1029 close(sock);
1030
1031 unlink(consumer_data->err_unix_sock_path);
1032 unlink(consumer_data->cmd_unix_sock_path);
1033 consumer_data->pid = 0;
1034
1035 lttng_poll_clean(&events);
1036
1037 return NULL;
1038 }
1039
1040 /*
1041 * This thread manage application communication.
1042 */
1043 static void *thread_manage_apps(void *data)
1044 {
1045 int i, ret, pollfd;
1046 uint32_t revents, nb_fd;
1047 struct ust_command ust_cmd;
1048 struct lttng_poll_event events;
1049
1050 DBG("[thread] Manage application started");
1051
1052 rcu_register_thread();
1053 rcu_thread_online();
1054
1055 ret = create_thread_poll_set(&events, 2);
1056 if (ret < 0) {
1057 goto error;
1058 }
1059
1060 ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP);
1061 if (ret < 0) {
1062 goto error;
1063 }
1064
1065 while (1) {
1066 /* Zeroed the events structure */
1067 lttng_poll_reset(&events);
1068
1069 nb_fd = LTTNG_POLL_GETNB(&events);
1070
1071 DBG("Apps thread polling on %d fds", nb_fd);
1072
1073 /* Inifinite blocking call, waiting for transmission */
1074 ret = lttng_poll_wait(&events, -1);
1075 if (ret < 0) {
1076 goto error;
1077 }
1078
1079 for (i = 0; i < nb_fd; i++) {
1080 /* Fetch once the poll data */
1081 revents = LTTNG_POLL_GETEV(&events, i);
1082 pollfd = LTTNG_POLL_GETFD(&events, i);
1083
1084 /* Thread quit pipe has been closed. Killing thread. */
1085 ret = check_thread_quit_pipe(pollfd, revents);
1086 if (ret) {
1087 goto error;
1088 }
1089
1090 /* Inspect the apps cmd pipe */
1091 if (pollfd == apps_cmd_pipe[0]) {
1092 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1093 ERR("Apps command pipe error");
1094 goto error;
1095 } else if (revents & LPOLLIN) {
1096 /* Empty pipe */
1097 ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd));
1098 if (ret < 0 || ret < sizeof(ust_cmd)) {
1099 perror("read apps cmd pipe");
1100 goto error;
1101 }
1102
1103 /* Register applicaton to the session daemon */
1104 ret = ust_app_register(&ust_cmd.reg_msg,
1105 ust_cmd.sock);
1106 if (ret == -ENOMEM) {
1107 goto error;
1108 } else if (ret < 0) {
1109 break;
1110 }
1111
1112 /*
1113 * Validate UST version compatibility.
1114 */
1115 ret = ust_app_validate_version(ust_cmd.sock);
1116 if (ret >= 0) {
1117 /*
1118 * Add channel(s) and event(s) to newly registered apps
1119 * from lttng global UST domain.
1120 */
1121 update_ust_app(ust_cmd.sock);
1122 }
1123
1124 ret = ust_app_register_done(ust_cmd.sock);
1125 if (ret < 0) {
1126 /*
1127 * If the registration is not possible, we simply
1128 * unregister the apps and continue
1129 */
1130 ust_app_unregister(ust_cmd.sock);
1131 } else {
1132 /*
1133 * We just need here to monitor the close of the UST
1134 * socket and poll set monitor those by default.
1135 */
1136 ret = lttng_poll_add(&events, ust_cmd.sock, 0);
1137 if (ret < 0) {
1138 goto error;
1139 }
1140
1141 DBG("Apps with sock %d added to poll set",
1142 ust_cmd.sock);
1143 }
1144
1145 break;
1146 }
1147 } else {
1148 /*
1149 * At this point, we know that a registered application made
1150 * the event at poll_wait.
1151 */
1152 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1153 /* Removing from the poll set */
1154 ret = lttng_poll_del(&events, pollfd);
1155 if (ret < 0) {
1156 goto error;
1157 }
1158
1159 /* Socket closed on remote end. */
1160 ust_app_unregister(pollfd);
1161 break;
1162 }
1163 }
1164 }
1165 }
1166
1167 error:
1168 DBG("Application communication apps dying");
1169 close(apps_cmd_pipe[0]);
1170 close(apps_cmd_pipe[1]);
1171
1172 lttng_poll_clean(&events);
1173
1174 rcu_thread_offline();
1175 rcu_unregister_thread();
1176 return NULL;
1177 }
1178
1179 /*
1180 * Dispatch request from the registration threads to the application
1181 * communication thread.
1182 */
1183 static void *thread_dispatch_ust_registration(void *data)
1184 {
1185 int ret;
1186 struct cds_wfq_node *node;
1187 struct ust_command *ust_cmd = NULL;
1188
1189 DBG("[thread] Dispatch UST command started");
1190
1191 while (!dispatch_thread_exit) {
1192 /* Atomically prepare the queue futex */
1193 futex_nto1_prepare(&ust_cmd_queue.futex);
1194
1195 do {
1196 /* Dequeue command for registration */
1197 node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue);
1198 if (node == NULL) {
1199 DBG("Woken up but nothing in the UST command queue");
1200 /* Continue thread execution */
1201 break;
1202 }
1203
1204 ust_cmd = caa_container_of(node, struct ust_command, node);
1205
1206 DBG("Dispatching UST registration pid:%d ppid:%d uid:%d"
1207 " gid:%d sock:%d name:%s (version %d.%d)",
1208 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1209 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1210 ust_cmd->sock, ust_cmd->reg_msg.name,
1211 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1212 /*
1213 * Inform apps thread of the new application registration. This
1214 * call is blocking so we can be assured that the data will be read
1215 * at some point in time or wait to the end of the world :)
1216 */
1217 ret = write(apps_cmd_pipe[1], ust_cmd,
1218 sizeof(struct ust_command));
1219 if (ret < 0) {
1220 perror("write apps cmd pipe");
1221 if (errno == EBADF) {
1222 /*
1223 * We can't inform the application thread to process
1224 * registration. We will exit or else application
1225 * registration will not occur and tracing will never
1226 * start.
1227 */
1228 goto error;
1229 }
1230 }
1231 free(ust_cmd);
1232 } while (node != NULL);
1233
1234 /* Futex wait on queue. Blocking call on futex() */
1235 futex_nto1_wait(&ust_cmd_queue.futex);
1236 }
1237
1238 error:
1239 DBG("Dispatch thread dying");
1240 return NULL;
1241 }
1242
1243 /*
1244 * This thread manage application registration.
1245 */
1246 static void *thread_registration_apps(void *data)
1247 {
1248 int sock = 0, i, ret, pollfd;
1249 uint32_t revents, nb_fd;
1250 struct lttng_poll_event events;
1251 /*
1252 * Get allocated in this thread, enqueued to a global queue, dequeued and
1253 * freed in the manage apps thread.
1254 */
1255 struct ust_command *ust_cmd = NULL;
1256
1257 DBG("[thread] Manage application registration started");
1258
1259 ret = lttcomm_listen_unix_sock(apps_sock);
1260 if (ret < 0) {
1261 goto error;
1262 }
1263
1264 /*
1265 * Pass 2 as size here for the thread quit pipe and apps socket. Nothing
1266 * more will be added to this poll set.
1267 */
1268 ret = create_thread_poll_set(&events, 2);
1269 if (ret < 0) {
1270 goto error;
1271 }
1272
1273 /* Add the application registration socket */
1274 ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP);
1275 if (ret < 0) {
1276 goto error;
1277 }
1278
1279 /* Notify all applications to register */
1280 ret = notify_ust_apps(1);
1281 if (ret < 0) {
1282 ERR("Failed to notify applications or create the wait shared memory.\n"
1283 "Execution continues but there might be problem for already\n"
1284 "running applications that wishes to register.");
1285 }
1286
1287 while (1) {
1288 DBG("Accepting application registration");
1289
1290 nb_fd = LTTNG_POLL_GETNB(&events);
1291
1292 /* Inifinite blocking call, waiting for transmission */
1293 ret = lttng_poll_wait(&events, -1);
1294 if (ret < 0) {
1295 goto error;
1296 }
1297
1298 for (i = 0; i < nb_fd; i++) {
1299 /* Fetch once the poll data */
1300 revents = LTTNG_POLL_GETEV(&events, i);
1301 pollfd = LTTNG_POLL_GETFD(&events, i);
1302
1303 /* Thread quit pipe has been closed. Killing thread. */
1304 ret = check_thread_quit_pipe(pollfd, revents);
1305 if (ret) {
1306 goto error;
1307 }
1308
1309 /* Event on the registration socket */
1310 if (pollfd == apps_sock) {
1311 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
1312 ERR("Register apps socket poll error");
1313 goto error;
1314 } else if (revents & LPOLLIN) {
1315 sock = lttcomm_accept_unix_sock(apps_sock);
1316 if (sock < 0) {
1317 goto error;
1318 }
1319
1320 /* Create UST registration command for enqueuing */
1321 ust_cmd = zmalloc(sizeof(struct ust_command));
1322 if (ust_cmd == NULL) {
1323 perror("ust command zmalloc");
1324 goto error;
1325 }
1326
1327 /*
1328 * Using message-based transmissions to ensure we don't
1329 * have to deal with partially received messages.
1330 */
1331 ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg,
1332 sizeof(struct ust_register_msg));
1333 if (ret < 0 || ret < sizeof(struct ust_register_msg)) {
1334 if (ret < 0) {
1335 perror("lttcomm_recv_unix_sock register apps");
1336 } else {
1337 ERR("Wrong size received on apps register");
1338 }
1339 free(ust_cmd);
1340 close(sock);
1341 continue;
1342 }
1343
1344 ust_cmd->sock = sock;
1345
1346 DBG("UST registration received with pid:%d ppid:%d uid:%d"
1347 " gid:%d sock:%d name:%s (version %d.%d)",
1348 ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid,
1349 ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid,
1350 ust_cmd->sock, ust_cmd->reg_msg.name,
1351 ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor);
1352
1353 /*
1354 * Lock free enqueue the registration request. The red pill
1355 * has been taken! This apps will be part of the *system*.
1356 */
1357 cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node);
1358
1359 /*
1360 * Wake the registration queue futex. Implicit memory
1361 * barrier with the exchange in cds_wfq_enqueue.
1362 */
1363 futex_nto1_wake(&ust_cmd_queue.futex);
1364 }
1365 }
1366 }
1367 }
1368
1369 error:
1370 DBG("UST Registration thread dying");
1371
1372 /* Notify that the registration thread is gone */
1373 notify_ust_apps(0);
1374
1375 close(apps_sock);
1376 close(sock);
1377 unlink(apps_unix_sock_path);
1378
1379 lttng_poll_clean(&events);
1380
1381 return NULL;
1382 }
1383
1384 /*
1385 * Start the thread_manage_consumer. This must be done after a lttng-consumerd
1386 * exec or it will fails.
1387 */
1388 static int spawn_consumer_thread(struct consumer_data *consumer_data)
1389 {
1390 int ret;
1391 struct timespec timeout;
1392
1393 timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT;
1394 timeout.tv_nsec = 0;
1395
1396 /* Setup semaphore */
1397 ret = sem_init(&consumer_data->sem, 0, 0);
1398 if (ret < 0) {
1399 PERROR("sem_init consumer semaphore");
1400 goto error;
1401 }
1402
1403 ret = pthread_create(&consumer_data->thread, NULL,
1404 thread_manage_consumer, consumer_data);
1405 if (ret != 0) {
1406 PERROR("pthread_create consumer");
1407 ret = -1;
1408 goto error;
1409 }
1410
1411 /* Get time for sem_timedwait absolute timeout */
1412 ret = clock_gettime(CLOCK_REALTIME, &timeout);
1413 if (ret < 0) {
1414 PERROR("clock_gettime spawn consumer");
1415 /* Infinite wait for the kconsumerd thread to be ready */
1416 ret = sem_wait(&consumer_data->sem);
1417 } else {
1418 /* Normal timeout if the gettime was successful */
1419 timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT;
1420 ret = sem_timedwait(&consumer_data->sem, &timeout);
1421 }
1422
1423 if (ret < 0) {
1424 if (errno == ETIMEDOUT) {
1425 /*
1426 * Call has timed out so we kill the kconsumerd_thread and return
1427 * an error.
1428 */
1429 ERR("The consumer thread was never ready. Killing it");
1430 ret = pthread_cancel(consumer_data->thread);
1431 if (ret < 0) {
1432 PERROR("pthread_cancel consumer thread");
1433 }
1434 } else {
1435 PERROR("semaphore wait failed consumer thread");
1436 }
1437 goto error;
1438 }
1439
1440 pthread_mutex_lock(&consumer_data->pid_mutex);
1441 if (consumer_data->pid == 0) {
1442 ERR("Kconsumerd did not start");
1443 pthread_mutex_unlock(&consumer_data->pid_mutex);
1444 goto error;
1445 }
1446 pthread_mutex_unlock(&consumer_data->pid_mutex);
1447
1448 return 0;
1449
1450 error:
1451 return ret;
1452 }
1453
1454 /*
1455 * Join consumer thread
1456 */
1457 static int join_consumer_thread(struct consumer_data *consumer_data)
1458 {
1459 void *status;
1460 int ret;
1461
1462 if (consumer_data->pid != 0) {
1463 ret = kill(consumer_data->pid, SIGTERM);
1464 if (ret) {
1465 ERR("Error killing consumer daemon");
1466 return ret;
1467 }
1468 return pthread_join(consumer_data->thread, &status);
1469 } else {
1470 return 0;
1471 }
1472 }
1473
1474 /*
1475 * Fork and exec a consumer daemon (consumerd).
1476 *
1477 * Return pid if successful else -1.
1478 */
1479 static pid_t spawn_consumerd(struct consumer_data *consumer_data)
1480 {
1481 int ret;
1482 pid_t pid;
1483 const char *consumer_to_use;
1484 const char *verbosity;
1485 struct stat st;
1486
1487 DBG("Spawning consumerd");
1488
1489 pid = fork();
1490 if (pid == 0) {
1491 /*
1492 * Exec consumerd.
1493 */
1494 if (opt_verbose_consumer) {
1495 verbosity = "--verbose";
1496 } else {
1497 verbosity = "--quiet";
1498 }
1499 switch (consumer_data->type) {
1500 case LTTNG_CONSUMER_KERNEL:
1501 /*
1502 * Find out which consumerd to execute. We will first try the
1503 * 64-bit path, then the sessiond's installation directory, and
1504 * fallback on the 32-bit one,
1505 */
1506 DBG3("Looking for a kernel consumer at these locations:");
1507 DBG3(" 1) %s", consumerd64_bin);
1508 DBG3(" 2) %s/%s", INSTALL_BIN_PATH, CONSUMERD_FILE);
1509 DBG3(" 3) %s", consumerd32_bin);
1510 if (stat(consumerd64_bin, &st) == 0) {
1511 DBG3("Found location #1");
1512 consumer_to_use = consumerd64_bin;
1513 } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) {
1514 DBG3("Found location #2");
1515 consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE;
1516 } else if (stat(consumerd32_bin, &st) == 0) {
1517 DBG3("Found location #3");
1518 consumer_to_use = consumerd32_bin;
1519 } else {
1520 DBG("Could not find any valid consumerd executable");
1521 break;
1522 }
1523 DBG("Using kernel consumer at: %s", consumer_to_use);
1524 execl(consumer_to_use,
1525 "lttng-consumerd", verbosity, "-k",
1526 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1527 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1528 NULL);
1529 break;
1530 case LTTNG_CONSUMER64_UST:
1531 {
1532 char *tmpnew = NULL;
1533
1534 if (consumerd64_libdir[0] != '\0') {
1535 char *tmp;
1536 size_t tmplen;
1537
1538 tmp = getenv("LD_LIBRARY_PATH");
1539 if (!tmp) {
1540 tmp = "";
1541 }
1542 tmplen = strlen("LD_LIBRARY_PATH=")
1543 + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp);
1544 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1545 if (!tmpnew) {
1546 ret = -ENOMEM;
1547 goto error;
1548 }
1549 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1550 strcat(tmpnew, consumerd64_libdir);
1551 if (tmp[0] != '\0') {
1552 strcat(tmpnew, ":");
1553 strcat(tmpnew, tmp);
1554 }
1555 ret = putenv(tmpnew);
1556 if (ret) {
1557 ret = -errno;
1558 goto error;
1559 }
1560 }
1561 DBG("Using 64-bit UST consumer at: %s", consumerd64_bin);
1562 ret = execl(consumerd64_bin, "lttng-consumerd", verbosity, "-u",
1563 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1564 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1565 NULL);
1566 if (consumerd64_libdir[0] != '\0') {
1567 free(tmpnew);
1568 }
1569 if (ret) {
1570 goto error;
1571 }
1572 break;
1573 }
1574 case LTTNG_CONSUMER32_UST:
1575 {
1576 char *tmpnew = NULL;
1577
1578 if (consumerd32_libdir[0] != '\0') {
1579 char *tmp;
1580 size_t tmplen;
1581
1582 tmp = getenv("LD_LIBRARY_PATH");
1583 if (!tmp) {
1584 tmp = "";
1585 }
1586 tmplen = strlen("LD_LIBRARY_PATH=")
1587 + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp);
1588 tmpnew = zmalloc(tmplen + 1 /* \0 */);
1589 if (!tmpnew) {
1590 ret = -ENOMEM;
1591 goto error;
1592 }
1593 strcpy(tmpnew, "LD_LIBRARY_PATH=");
1594 strcat(tmpnew, consumerd32_libdir);
1595 if (tmp[0] != '\0') {
1596 strcat(tmpnew, ":");
1597 strcat(tmpnew, tmp);
1598 }
1599 ret = putenv(tmpnew);
1600 if (ret) {
1601 ret = -errno;
1602 goto error;
1603 }
1604 }
1605 DBG("Using 32-bit UST consumer at: %s", consumerd32_bin);
1606 ret = execl(consumerd32_bin, "lttng-consumerd", verbosity, "-u",
1607 "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path,
1608 "--consumerd-err-sock", consumer_data->err_unix_sock_path,
1609 NULL);
1610 if (consumerd32_libdir[0] != '\0') {
1611 free(tmpnew);
1612 }
1613 if (ret) {
1614 goto error;
1615 }
1616 break;
1617 }
1618 default:
1619 perror("unknown consumer type");
1620 exit(EXIT_FAILURE);
1621 }
1622 if (errno != 0) {
1623 perror("kernel start consumer exec");
1624 }
1625 exit(EXIT_FAILURE);
1626 } else if (pid > 0) {
1627 ret = pid;
1628 } else {
1629 perror("start consumer fork");
1630 ret = -errno;
1631 }
1632 error:
1633 return ret;
1634 }
1635
1636 /*
1637 * Spawn the consumerd daemon and session daemon thread.
1638 */
1639 static int start_consumerd(struct consumer_data *consumer_data)
1640 {
1641 int ret;
1642
1643 pthread_mutex_lock(&consumer_data->pid_mutex);
1644 if (consumer_data->pid != 0) {
1645 pthread_mutex_unlock(&consumer_data->pid_mutex);
1646 goto end;
1647 }
1648
1649 ret = spawn_consumerd(consumer_data);
1650 if (ret < 0) {
1651 ERR("Spawning consumerd failed");
1652 pthread_mutex_unlock(&consumer_data->pid_mutex);
1653 goto error;
1654 }
1655
1656 /* Setting up the consumer_data pid */
1657 consumer_data->pid = ret;
1658 DBG2("Consumer pid %d", consumer_data->pid);
1659 pthread_mutex_unlock(&consumer_data->pid_mutex);
1660
1661 DBG2("Spawning consumer control thread");
1662 ret = spawn_consumer_thread(consumer_data);
1663 if (ret < 0) {
1664 ERR("Fatal error spawning consumer control thread");
1665 goto error;
1666 }
1667
1668 end:
1669 return 0;
1670
1671 error:
1672 return ret;
1673 }
1674
1675 /*
1676 * Check version of the lttng-modules.
1677 */
1678 static int validate_lttng_modules_version(void)
1679 {
1680 return kernel_validate_version(kernel_tracer_fd);
1681 }
1682
1683 /*
1684 * Setup necessary data for kernel tracer action.
1685 */
1686 static int init_kernel_tracer(void)
1687 {
1688 int ret;
1689
1690 /* Modprobe lttng kernel modules */
1691 ret = modprobe_lttng_control();
1692 if (ret < 0) {
1693 goto error;
1694 }
1695
1696 /* Open debugfs lttng */
1697 kernel_tracer_fd = open(module_proc_lttng, O_RDWR);
1698 if (kernel_tracer_fd < 0) {
1699 DBG("Failed to open %s", module_proc_lttng);
1700 ret = -1;
1701 goto error_open;
1702 }
1703
1704 /* Validate kernel version */
1705 ret = validate_lttng_modules_version();
1706 if (ret < 0) {
1707 goto error_version;
1708 }
1709
1710 ret = modprobe_lttng_data();
1711 if (ret < 0) {
1712 goto error_modules;
1713 }
1714
1715 DBG("Kernel tracer fd %d", kernel_tracer_fd);
1716 return 0;
1717
1718 error_version:
1719 modprobe_remove_lttng_control();
1720 close(kernel_tracer_fd);
1721 kernel_tracer_fd = 0;
1722 return LTTCOMM_KERN_VERSION;
1723
1724 error_modules:
1725 close(kernel_tracer_fd);
1726
1727 error_open:
1728 modprobe_remove_lttng_control();
1729
1730 error:
1731 WARN("No kernel tracer available");
1732 kernel_tracer_fd = 0;
1733 return LTTCOMM_KERN_NA;
1734 }
1735
1736 /*
1737 * Init tracing by creating trace directory and sending fds kernel consumer.
1738 */
1739 static int init_kernel_tracing(struct ltt_kernel_session *session)
1740 {
1741 int ret = 0;
1742
1743 if (session->consumer_fds_sent == 0) {
1744 /*
1745 * Assign default kernel consumer socket if no consumer assigned to the
1746 * kernel session. At this point, it's NOT suppose to be 0 but this is
1747 * an extra security check.
1748 */
1749 if (session->consumer_fd == 0) {
1750 session->consumer_fd = kconsumer_data.cmd_sock;
1751 }
1752
1753 ret = send_kconsumer_session_streams(&kconsumer_data, session);
1754 if (ret < 0) {
1755 ret = LTTCOMM_KERN_CONSUMER_FAIL;
1756 goto error;
1757 }
1758
1759 session->consumer_fds_sent = 1;
1760 }
1761
1762 error:
1763 return ret;
1764 }
1765
1766 /*
1767 * Create an UST session and add it to the session ust list.
1768 */
1769 static int create_ust_session(struct ltt_session *session,
1770 struct lttng_domain *domain)
1771 {
1772 struct ltt_ust_session *lus = NULL;
1773 int ret;
1774
1775 switch (domain->type) {
1776 case LTTNG_DOMAIN_UST:
1777 break;
1778 default:
1779 ret = LTTCOMM_UNKNOWN_DOMAIN;
1780 goto error;
1781 }
1782
1783 DBG("Creating UST session");
1784
1785 lus = trace_ust_create_session(session->path, session->id, domain);
1786 if (lus == NULL) {
1787 ret = LTTCOMM_UST_SESS_FAIL;
1788 goto error;
1789 }
1790
1791 ret = run_as_mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG,
1792 session->uid, session->gid);
1793 if (ret < 0) {
1794 if (ret != -EEXIST) {
1795 ERR("Trace directory creation error");
1796 ret = LTTCOMM_UST_SESS_FAIL;
1797 goto error;
1798 }
1799 }
1800
1801 /* The domain type dictate different actions on session creation */
1802 switch (domain->type) {
1803 case LTTNG_DOMAIN_UST:
1804 /* No ustctl for the global UST domain */
1805 break;
1806 default:
1807 ERR("Unknown UST domain on create session %d", domain->type);
1808 goto error;
1809 }
1810 lus->uid = session->uid;
1811 lus->gid = session->gid;
1812 session->ust_session = lus;
1813
1814 return LTTCOMM_OK;
1815
1816 error:
1817 free(lus);
1818 return ret;
1819 }
1820
1821 /*
1822 * Create a kernel tracer session then create the default channel.
1823 */
1824 static int create_kernel_session(struct ltt_session *session)
1825 {
1826 int ret;
1827
1828 DBG("Creating kernel session");
1829
1830 ret = kernel_create_session(session, kernel_tracer_fd);
1831 if (ret < 0) {
1832 ret = LTTCOMM_KERN_SESS_FAIL;
1833 goto error;
1834 }
1835
1836 /* Set kernel consumer socket fd */
1837 if (kconsumer_data.cmd_sock) {
1838 session->kernel_session->consumer_fd = kconsumer_data.cmd_sock;
1839 }
1840
1841 ret = run_as_mkdir_recursive(session->kernel_session->trace_path,
1842 S_IRWXU | S_IRWXG, session->uid, session->gid);
1843 if (ret < 0) {
1844 if (ret != -EEXIST) {
1845 ERR("Trace directory creation error");
1846 goto error;
1847 }
1848 }
1849 session->kernel_session->uid = session->uid;
1850 session->kernel_session->gid = session->gid;
1851
1852 error:
1853 return ret;
1854 }
1855
1856 /*
1857 * Check if the UID or GID match the session. Root user has access to all
1858 * sessions.
1859 */
1860 static int session_access_ok(struct ltt_session *session, uid_t uid, gid_t gid)
1861 {
1862 if (uid != session->uid && gid != session->gid && uid != 0) {
1863 return 0;
1864 } else {
1865 return 1;
1866 }
1867 }
1868
1869 static unsigned int lttng_sessions_count(uid_t uid, gid_t gid)
1870 {
1871 unsigned int i = 0;
1872 struct ltt_session *session;
1873
1874 DBG("Counting number of available session for UID %d GID %d",
1875 uid, gid);
1876 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1877 /*
1878 * Only list the sessions the user can control.
1879 */
1880 if (!session_access_ok(session, uid, gid)) {
1881 continue;
1882 }
1883 i++;
1884 }
1885 return i;
1886 }
1887
1888 /*
1889 * Using the session list, filled a lttng_session array to send back to the
1890 * client for session listing.
1891 *
1892 * The session list lock MUST be acquired before calling this function. Use
1893 * session_lock_list() and session_unlock_list().
1894 */
1895 static void list_lttng_sessions(struct lttng_session *sessions, uid_t uid,
1896 gid_t gid)
1897 {
1898 unsigned int i = 0;
1899 struct ltt_session *session;
1900
1901 DBG("Getting all available session for UID %d GID %d",
1902 uid, gid);
1903 /*
1904 * Iterate over session list and append data after the control struct in
1905 * the buffer.
1906 */
1907 cds_list_for_each_entry(session, &session_list_ptr->head, list) {
1908 /*
1909 * Only list the sessions the user can control.
1910 */
1911 if (!session_access_ok(session, uid, gid)) {
1912 continue;
1913 }
1914 strncpy(sessions[i].path, session->path, PATH_MAX);
1915 sessions[i].path[PATH_MAX - 1] = '\0';
1916 strncpy(sessions[i].name, session->name, NAME_MAX);
1917 sessions[i].name[NAME_MAX - 1] = '\0';
1918 sessions[i].enabled = session->enabled;
1919 i++;
1920 }
1921 }
1922
1923 /*
1924 * Fill lttng_channel array of all channels.
1925 */
1926 static void list_lttng_channels(int domain, struct ltt_session *session,
1927 struct lttng_channel *channels)
1928 {
1929 int i = 0;
1930 struct ltt_kernel_channel *kchan;
1931
1932 DBG("Listing channels for session %s", session->name);
1933
1934 switch (domain) {
1935 case LTTNG_DOMAIN_KERNEL:
1936 /* Kernel channels */
1937 if (session->kernel_session != NULL) {
1938 cds_list_for_each_entry(kchan,
1939 &session->kernel_session->channel_list.head, list) {
1940 /* Copy lttng_channel struct to array */
1941 memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel));
1942 channels[i].enabled = kchan->enabled;
1943 i++;
1944 }
1945 }
1946 break;
1947 case LTTNG_DOMAIN_UST:
1948 {
1949 struct lttng_ht_iter iter;
1950 struct ltt_ust_channel *uchan;
1951
1952 cds_lfht_for_each_entry(session->ust_session->domain_global.channels->ht,
1953 &iter.iter, uchan, node.node) {
1954 strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN);
1955 channels[i].attr.overwrite = uchan->attr.overwrite;
1956 channels[i].attr.subbuf_size = uchan->attr.subbuf_size;
1957 channels[i].attr.num_subbuf = uchan->attr.num_subbuf;
1958 channels[i].attr.switch_timer_interval =
1959 uchan->attr.switch_timer_interval;
1960 channels[i].attr.read_timer_interval =
1961 uchan->attr.read_timer_interval;
1962 channels[i].enabled = uchan->enabled;
1963 switch (uchan->attr.output) {
1964 case LTTNG_UST_MMAP:
1965 default:
1966 channels[i].attr.output = LTTNG_EVENT_MMAP;
1967 break;
1968 }
1969 i++;
1970 }
1971 break;
1972 }
1973 default:
1974 break;
1975 }
1976 }
1977
1978 /*
1979 * Create a list of ust global domain events.
1980 */
1981 static int list_lttng_ust_global_events(char *channel_name,
1982 struct ltt_ust_domain_global *ust_global, struct lttng_event **events)
1983 {
1984 int i = 0, ret = 0;
1985 unsigned int nb_event = 0;
1986 struct lttng_ht_iter iter;
1987 struct lttng_ht_node_str *node;
1988 struct ltt_ust_channel *uchan;
1989 struct ltt_ust_event *uevent;
1990 struct lttng_event *tmp;
1991
1992 DBG("Listing UST global events for channel %s", channel_name);
1993
1994 rcu_read_lock();
1995
1996 lttng_ht_lookup(ust_global->channels, (void *)channel_name, &iter);
1997 node = lttng_ht_iter_get_node_str(&iter);
1998 if (node == NULL) {
1999 ret = -LTTCOMM_UST_CHAN_NOT_FOUND;
2000 goto error;
2001 }
2002
2003 uchan = caa_container_of(&node->node, struct ltt_ust_channel, node.node);
2004
2005 nb_event += lttng_ht_get_count(uchan->events);
2006
2007 if (nb_event == 0) {
2008 ret = nb_event;
2009 goto error;
2010 }
2011
2012 DBG3("Listing UST global %d events", nb_event);
2013
2014 tmp = zmalloc(nb_event * sizeof(struct lttng_event));
2015 if (tmp == NULL) {
2016 ret = -LTTCOMM_FATAL;
2017 goto error;
2018 }
2019
2020 cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, node.node) {
2021 strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN);
2022 tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2023 tmp[i].enabled = uevent->enabled;
2024 switch (uevent->attr.instrumentation) {
2025 case LTTNG_UST_TRACEPOINT:
2026 tmp[i].type = LTTNG_EVENT_TRACEPOINT;
2027 break;
2028 case LTTNG_UST_PROBE:
2029 tmp[i].type = LTTNG_EVENT_PROBE;
2030 break;
2031 case LTTNG_UST_FUNCTION:
2032 tmp[i].type = LTTNG_EVENT_FUNCTION;
2033 break;
2034 case LTTNG_UST_TRACEPOINT_LOGLEVEL:
2035 tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL;
2036 break;
2037 }
2038 i++;
2039 }
2040
2041 ret = nb_event;
2042 *events = tmp;
2043
2044 error:
2045 rcu_read_unlock();
2046 return ret;
2047 }
2048
2049 /*
2050 * Fill lttng_event array of all kernel events in the channel.
2051 */
2052 static int list_lttng_kernel_events(char *channel_name,
2053 struct ltt_kernel_session *kernel_session, struct lttng_event **events)
2054 {
2055 int i = 0, ret;
2056 unsigned int nb_event;
2057 struct ltt_kernel_event *event;
2058 struct ltt_kernel_channel *kchan;
2059
2060 kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session);
2061 if (kchan == NULL) {
2062 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2063 goto error;
2064 }
2065
2066 nb_event = kchan->event_count;
2067
2068 DBG("Listing events for channel %s", kchan->channel->name);
2069
2070 if (nb_event == 0) {
2071 ret = nb_event;
2072 goto error;
2073 }
2074
2075 *events = zmalloc(nb_event * sizeof(struct lttng_event));
2076 if (*events == NULL) {
2077 ret = LTTCOMM_FATAL;
2078 goto error;
2079 }
2080
2081 /* Kernel channels */
2082 cds_list_for_each_entry(event, &kchan->events_list.head , list) {
2083 strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN);
2084 (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
2085 (*events)[i].enabled = event->enabled;
2086 switch (event->event->instrumentation) {
2087 case LTTNG_KERNEL_TRACEPOINT:
2088 (*events)[i].type = LTTNG_EVENT_TRACEPOINT;
2089 break;
2090 case LTTNG_KERNEL_KPROBE:
2091 case LTTNG_KERNEL_KRETPROBE:
2092 (*events)[i].type = LTTNG_EVENT_PROBE;
2093 memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe,
2094 sizeof(struct lttng_kernel_kprobe));
2095 break;
2096 case LTTNG_KERNEL_FUNCTION:
2097 (*events)[i].type = LTTNG_EVENT_FUNCTION;
2098 memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace,
2099 sizeof(struct lttng_kernel_function));
2100 break;
2101 case LTTNG_KERNEL_NOOP:
2102 (*events)[i].type = LTTNG_EVENT_NOOP;
2103 break;
2104 case LTTNG_KERNEL_SYSCALL:
2105 (*events)[i].type = LTTNG_EVENT_SYSCALL;
2106 break;
2107 case LTTNG_KERNEL_ALL:
2108 assert(0);
2109 break;
2110 }
2111 i++;
2112 }
2113
2114 return nb_event;
2115
2116 error:
2117 return ret;
2118 }
2119
2120 /*
2121 * Command LTTNG_DISABLE_CHANNEL processed by the client thread.
2122 */
2123 static int cmd_disable_channel(struct ltt_session *session,
2124 int domain, char *channel_name)
2125 {
2126 int ret;
2127 struct ltt_ust_session *usess;
2128
2129 usess = session->ust_session;
2130
2131 switch (domain) {
2132 case LTTNG_DOMAIN_KERNEL:
2133 {
2134 ret = channel_kernel_disable(session->kernel_session,
2135 channel_name);
2136 if (ret != LTTCOMM_OK) {
2137 goto error;
2138 }
2139
2140 kernel_wait_quiescent(kernel_tracer_fd);
2141 break;
2142 }
2143 case LTTNG_DOMAIN_UST:
2144 {
2145 struct ltt_ust_channel *uchan;
2146 struct lttng_ht *chan_ht;
2147
2148 chan_ht = usess->domain_global.channels;
2149
2150 uchan = trace_ust_find_channel_by_name(chan_ht, channel_name);
2151 if (uchan == NULL) {
2152 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2153 goto error;
2154 }
2155
2156 ret = channel_ust_disable(usess, domain, uchan);
2157 if (ret != LTTCOMM_OK) {
2158 goto error;
2159 }
2160 break;
2161 }
2162 #if 0
2163 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2164 case LTTNG_DOMAIN_UST_EXEC_NAME:
2165 case LTTNG_DOMAIN_UST_PID:
2166 #endif
2167 default:
2168 ret = LTTCOMM_UNKNOWN_DOMAIN;
2169 goto error;
2170 }
2171
2172 ret = LTTCOMM_OK;
2173
2174 error:
2175 return ret;
2176 }
2177
2178 /*
2179 * Command LTTNG_ENABLE_CHANNEL processed by the client thread.
2180 */
2181 static int cmd_enable_channel(struct ltt_session *session,
2182 int domain, struct lttng_channel *attr)
2183 {
2184 int ret;
2185 struct ltt_ust_session *usess = session->ust_session;
2186 struct lttng_ht *chan_ht;
2187
2188 DBG("Enabling channel %s for session %s", attr->name, session->name);
2189
2190 switch (domain) {
2191 case LTTNG_DOMAIN_KERNEL:
2192 {
2193 struct ltt_kernel_channel *kchan;
2194
2195 kchan = trace_kernel_get_channel_by_name(attr->name,
2196 session->kernel_session);
2197 if (kchan == NULL) {
2198 ret = channel_kernel_create(session->kernel_session,
2199 attr, kernel_poll_pipe[1]);
2200 } else {
2201 ret = channel_kernel_enable(session->kernel_session, kchan);
2202 }
2203
2204 if (ret != LTTCOMM_OK) {
2205 goto error;
2206 }
2207
2208 kernel_wait_quiescent(kernel_tracer_fd);
2209 break;
2210 }
2211 case LTTNG_DOMAIN_UST:
2212 {
2213 struct ltt_ust_channel *uchan;
2214
2215 chan_ht = usess->domain_global.channels;
2216
2217 uchan = trace_ust_find_channel_by_name(chan_ht, attr->name);
2218 if (uchan == NULL) {
2219 ret = channel_ust_create(usess, domain, attr);
2220 } else {
2221 ret = channel_ust_enable(usess, domain, uchan);
2222 }
2223 break;
2224 }
2225 #if 0
2226 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2227 case LTTNG_DOMAIN_UST_EXEC_NAME:
2228 case LTTNG_DOMAIN_UST_PID:
2229 #endif
2230 default:
2231 ret = LTTCOMM_UNKNOWN_DOMAIN;
2232 goto error;
2233 }
2234
2235 error:
2236 return ret;
2237 }
2238
2239 /*
2240 * Command LTTNG_DISABLE_EVENT processed by the client thread.
2241 */
2242 static int cmd_disable_event(struct ltt_session *session, int domain,
2243 char *channel_name, char *event_name)
2244 {
2245 int ret;
2246
2247 switch (domain) {
2248 case LTTNG_DOMAIN_KERNEL:
2249 {
2250 struct ltt_kernel_channel *kchan;
2251 struct ltt_kernel_session *ksess;
2252
2253 ksess = session->kernel_session;
2254
2255 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2256 if (kchan == NULL) {
2257 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2258 goto error;
2259 }
2260
2261 ret = event_kernel_disable_tracepoint(ksess, kchan, event_name);
2262 if (ret != LTTCOMM_OK) {
2263 goto error;
2264 }
2265
2266 kernel_wait_quiescent(kernel_tracer_fd);
2267 break;
2268 }
2269 case LTTNG_DOMAIN_UST:
2270 {
2271 struct ltt_ust_channel *uchan;
2272 struct ltt_ust_session *usess;
2273
2274 usess = session->ust_session;
2275
2276 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2277 channel_name);
2278 if (uchan == NULL) {
2279 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2280 goto error;
2281 }
2282
2283 ret = event_ust_disable_tracepoint(usess, domain, uchan, event_name);
2284 if (ret != LTTCOMM_OK) {
2285 goto error;
2286 }
2287
2288 DBG3("Disable UST event %s in channel %s completed", event_name,
2289 channel_name);
2290 break;
2291 }
2292 #if 0
2293 case LTTNG_DOMAIN_UST_EXEC_NAME:
2294 case LTTNG_DOMAIN_UST_PID:
2295 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2296 #endif
2297 default:
2298 ret = LTTCOMM_NOT_IMPLEMENTED;
2299 goto error;
2300 }
2301
2302 ret = LTTCOMM_OK;
2303
2304 error:
2305 return ret;
2306 }
2307
2308 /*
2309 * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread.
2310 */
2311 static int cmd_disable_event_all(struct ltt_session *session, int domain,
2312 char *channel_name)
2313 {
2314 int ret;
2315
2316 switch (domain) {
2317 case LTTNG_DOMAIN_KERNEL:
2318 {
2319 struct ltt_kernel_session *ksess;
2320 struct ltt_kernel_channel *kchan;
2321
2322 ksess = session->kernel_session;
2323
2324 kchan = trace_kernel_get_channel_by_name(channel_name, ksess);
2325 if (kchan == NULL) {
2326 ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
2327 goto error;
2328 }
2329
2330 ret = event_kernel_disable_all(ksess, kchan);
2331 if (ret != LTTCOMM_OK) {
2332 goto error;
2333 }
2334
2335 kernel_wait_quiescent(kernel_tracer_fd);
2336 break;
2337 }
2338 case LTTNG_DOMAIN_UST:
2339 {
2340 struct ltt_ust_session *usess;
2341 struct ltt_ust_channel *uchan;
2342
2343 usess = session->ust_session;
2344
2345 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2346 channel_name);
2347 if (uchan == NULL) {
2348 ret = LTTCOMM_UST_CHAN_NOT_FOUND;
2349 goto error;
2350 }
2351
2352 ret = event_ust_disable_all_tracepoints(usess, domain, uchan);
2353 if (ret != 0) {
2354 goto error;
2355 }
2356
2357 DBG3("Disable all UST events in channel %s completed", channel_name);
2358
2359 break;
2360 }
2361 #if 0
2362 case LTTNG_DOMAIN_UST_EXEC_NAME:
2363 case LTTNG_DOMAIN_UST_PID:
2364 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2365 #endif
2366 default:
2367 ret = LTTCOMM_NOT_IMPLEMENTED;
2368 goto error;
2369 }
2370
2371 ret = LTTCOMM_OK;
2372
2373 error:
2374 return ret;
2375 }
2376
2377 /*
2378 * Command LTTNG_ADD_CONTEXT processed by the client thread.
2379 */
2380 static int cmd_add_context(struct ltt_session *session, int domain,
2381 char *channel_name, char *event_name, struct lttng_event_context *ctx)
2382 {
2383 int ret;
2384
2385 switch (domain) {
2386 case LTTNG_DOMAIN_KERNEL:
2387 /* Add kernel context to kernel tracer */
2388 ret = context_kernel_add(session->kernel_session, ctx,
2389 event_name, channel_name);
2390 if (ret != LTTCOMM_OK) {
2391 goto error;
2392 }
2393 break;
2394 case LTTNG_DOMAIN_UST:
2395 {
2396 struct ltt_ust_session *usess = session->ust_session;
2397
2398 ret = context_ust_add(usess, domain, ctx, event_name, channel_name);
2399 if (ret != LTTCOMM_OK) {
2400 goto error;
2401 }
2402 break;
2403 }
2404 #if 0
2405 case LTTNG_DOMAIN_UST_EXEC_NAME:
2406 case LTTNG_DOMAIN_UST_PID:
2407 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2408 #endif
2409 default:
2410 ret = LTTCOMM_NOT_IMPLEMENTED;
2411 goto error;
2412 }
2413
2414 ret = LTTCOMM_OK;
2415
2416 error:
2417 return ret;
2418 }
2419
2420 /*
2421 * Command LTTNG_ENABLE_EVENT processed by the client thread.
2422 *
2423 * TODO: currently, both events and loglevels are kept within the same
2424 * namespace for UST global registry/app registery, so if an event
2425 * happen to have the same name as the loglevel (very unlikely though),
2426 * and an attempt is made to enable/disable both in the same session,
2427 * the first to be created will be the only one allowed to exist.
2428 */
2429 static int cmd_enable_event(struct ltt_session *session, int domain,
2430 char *channel_name, struct lttng_event *event)
2431 {
2432 int ret;
2433 struct lttng_channel *attr;
2434 struct ltt_ust_session *usess = session->ust_session;
2435
2436 switch (domain) {
2437 case LTTNG_DOMAIN_KERNEL:
2438 {
2439 struct ltt_kernel_channel *kchan;
2440
2441 kchan = trace_kernel_get_channel_by_name(channel_name,
2442 session->kernel_session);
2443 if (kchan == NULL) {
2444 attr = channel_new_default_attr(domain);
2445 if (attr == NULL) {
2446 ret = LTTCOMM_FATAL;
2447 goto error;
2448 }
2449 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2450
2451 /* This call will notify the kernel thread */
2452 ret = channel_kernel_create(session->kernel_session,
2453 attr, kernel_poll_pipe[1]);
2454 if (ret != LTTCOMM_OK) {
2455 free(attr);
2456 goto error;
2457 }
2458 free(attr);
2459 }
2460
2461 /* Get the newly created kernel channel pointer */
2462 kchan = trace_kernel_get_channel_by_name(channel_name,
2463 session->kernel_session);
2464 if (kchan == NULL) {
2465 /* This sould not happen... */
2466 ret = LTTCOMM_FATAL;
2467 goto error;
2468 }
2469
2470 ret = event_kernel_enable_tracepoint(session->kernel_session, kchan,
2471 event);
2472 if (ret != LTTCOMM_OK) {
2473 goto error;
2474 }
2475
2476 kernel_wait_quiescent(kernel_tracer_fd);
2477 break;
2478 }
2479 case LTTNG_DOMAIN_UST:
2480 {
2481 struct lttng_channel *attr;
2482 struct ltt_ust_channel *uchan;
2483
2484 /* Get channel from global UST domain */
2485 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2486 channel_name);
2487 if (uchan == NULL) {
2488 /* Create default channel */
2489 attr = channel_new_default_attr(domain);
2490 if (attr == NULL) {
2491 ret = LTTCOMM_FATAL;
2492 goto error;
2493 }
2494 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2495 attr->name[NAME_MAX - 1] = '\0';
2496
2497 ret = channel_ust_create(usess, domain, attr);
2498 if (ret != LTTCOMM_OK) {
2499 free(attr);
2500 goto error;
2501 }
2502 free(attr);
2503
2504 /* Get the newly created channel reference back */
2505 uchan = trace_ust_find_channel_by_name(
2506 usess->domain_global.channels, channel_name);
2507 if (uchan == NULL) {
2508 /* Something is really wrong */
2509 ret = LTTCOMM_FATAL;
2510 goto error;
2511 }
2512 }
2513
2514 /* At this point, the session and channel exist on the tracer */
2515 ret = event_ust_enable_tracepoint(usess, domain, uchan, event);
2516 if (ret != LTTCOMM_OK) {
2517 goto error;
2518 }
2519 break;
2520 }
2521 #if 0
2522 case LTTNG_DOMAIN_UST_EXEC_NAME:
2523 case LTTNG_DOMAIN_UST_PID:
2524 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2525 #endif
2526 default:
2527 ret = LTTCOMM_NOT_IMPLEMENTED;
2528 goto error;
2529 }
2530
2531 ret = LTTCOMM_OK;
2532
2533 error:
2534 return ret;
2535 }
2536
2537 /*
2538 * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread.
2539 */
2540 static int cmd_enable_event_all(struct ltt_session *session, int domain,
2541 char *channel_name, int event_type)
2542 {
2543 int ret;
2544 struct ltt_kernel_channel *kchan;
2545
2546 switch (domain) {
2547 case LTTNG_DOMAIN_KERNEL:
2548 kchan = trace_kernel_get_channel_by_name(channel_name,
2549 session->kernel_session);
2550 if (kchan == NULL) {
2551 /* This call will notify the kernel thread */
2552 ret = channel_kernel_create(session->kernel_session, NULL,
2553 kernel_poll_pipe[1]);
2554 if (ret != LTTCOMM_OK) {
2555 goto error;
2556 }
2557
2558 /* Get the newly created kernel channel pointer */
2559 kchan = trace_kernel_get_channel_by_name(channel_name,
2560 session->kernel_session);
2561 if (kchan == NULL) {
2562 /* This sould not happen... */
2563 ret = LTTCOMM_FATAL;
2564 goto error;
2565 }
2566
2567 }
2568
2569 switch (event_type) {
2570 case LTTNG_EVENT_SYSCALL:
2571 ret = event_kernel_enable_all_syscalls(session->kernel_session,
2572 kchan, kernel_tracer_fd);
2573 break;
2574 case LTTNG_EVENT_TRACEPOINT:
2575 /*
2576 * This call enables all LTTNG_KERNEL_TRACEPOINTS and
2577 * events already registered to the channel.
2578 */
2579 ret = event_kernel_enable_all_tracepoints(session->kernel_session,
2580 kchan, kernel_tracer_fd);
2581 break;
2582 case LTTNG_EVENT_ALL:
2583 /* Enable syscalls and tracepoints */
2584 ret = event_kernel_enable_all(session->kernel_session,
2585 kchan, kernel_tracer_fd);
2586 break;
2587 default:
2588 ret = LTTCOMM_KERN_ENABLE_FAIL;
2589 goto error;
2590 }
2591
2592 /* Manage return value */
2593 if (ret != LTTCOMM_OK) {
2594 goto error;
2595 }
2596
2597 kernel_wait_quiescent(kernel_tracer_fd);
2598 break;
2599 case LTTNG_DOMAIN_UST:
2600 {
2601 struct lttng_channel *attr;
2602 struct ltt_ust_channel *uchan;
2603 struct ltt_ust_session *usess = session->ust_session;
2604
2605 /* Get channel from global UST domain */
2606 uchan = trace_ust_find_channel_by_name(usess->domain_global.channels,
2607 channel_name);
2608 if (uchan == NULL) {
2609 /* Create default channel */
2610 attr = channel_new_default_attr(domain);
2611 if (attr == NULL) {
2612 ret = LTTCOMM_FATAL;
2613 goto error;
2614 }
2615 snprintf(attr->name, NAME_MAX, "%s", channel_name);
2616 attr->name[NAME_MAX - 1] = '\0';
2617
2618 /* Use the internal command enable channel */
2619 ret = channel_ust_create(usess, domain, attr);
2620 if (ret != LTTCOMM_OK) {
2621 free(attr);
2622 goto error;
2623 }
2624 free(attr);
2625
2626 /* Get the newly created channel reference back */
2627 uchan = trace_ust_find_channel_by_name(
2628 usess->domain_global.channels, channel_name);
2629 if (uchan == NULL) {
2630 /* Something is really wrong */
2631 ret = LTTCOMM_FATAL;
2632 goto error;
2633 }
2634 }
2635
2636 /* At this point, the session and channel exist on the tracer */
2637
2638 switch (event_type) {
2639 case LTTNG_EVENT_ALL:
2640 case LTTNG_EVENT_TRACEPOINT:
2641 ret = event_ust_enable_all_tracepoints(usess, domain, uchan);
2642 if (ret != LTTCOMM_OK) {
2643 goto error;
2644 }
2645 break;
2646 default:
2647 ret = LTTCOMM_UST_ENABLE_FAIL;
2648 goto error;
2649 }
2650
2651 /* Manage return value */
2652 if (ret != LTTCOMM_OK) {
2653 goto error;
2654 }
2655
2656 break;
2657 }
2658 #if 0
2659 case LTTNG_DOMAIN_UST_EXEC_NAME:
2660 case LTTNG_DOMAIN_UST_PID:
2661 case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
2662 #endif
2663 default:
2664 ret = LTTCOMM_NOT_IMPLEMENTED;
2665 goto error;
2666 }
2667
2668 ret = LTTCOMM_OK;
2669
2670 error:
2671 return ret;
2672 }
2673
2674 /*
2675 * Command LTTNG_LIST_TRACEPOINTS processed by the client thread.
2676 */
2677 static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events)
2678 {
2679 int ret;
2680 ssize_t nb_events = 0;
2681
2682 switch (domain) {
2683 case LTTNG_DOMAIN_KERNEL:
2684 nb_events = kernel_list_events(kernel_tracer_fd, events);
2685 if (nb_events < 0) {
2686 ret = LTTCOMM_KERN_LIST_FAIL;
2687 goto error;
2688 }
2689 break;
2690 case LTTNG_DOMAIN_UST:
2691 nb_events = ust_app_list_events(events);
2692 if (nb_events < 0) {
2693 ret = LTTCOMM_UST_LIST_FAIL;
2694 goto error;
2695 }
2696 break;
2697 default:
2698 ret = LTTCOMM_NOT_IMPLEMENTED;
2699 goto error;
2700 }
2701
2702 return nb_events;
2703
2704 error:
2705 /* Return negative value to differentiate return code */
2706 return -ret;
2707 }
2708
2709 /*
2710 * Command LTTNG_START_TRACE processed by the client thread.
2711 */
2712 static int cmd_start_trace(struct ltt_session *session)
2713 {
2714 int ret;
2715 struct ltt_kernel_session *ksession;
2716 struct ltt_ust_session *usess;
2717
2718 /* Short cut */
2719 ksession = session->kernel_session;
2720 usess = session->ust_session;
2721
2722 if (session->enabled) {
2723 ret = LTTCOMM_UST_START_FAIL;
2724 goto error;
2725 }
2726
2727 session->enabled = 1;
2728
2729 /* Kernel tracing */
2730 if (ksession != NULL) {
2731 struct ltt_kernel_channel *kchan;
2732
2733 /* Open kernel metadata */
2734 if (ksession->metadata == NULL) {
2735 ret = kernel_open_metadata(ksession, ksession->trace_path);
2736 if (ret < 0) {
2737 ret = LTTCOMM_KERN_META_FAIL;
2738 goto error;
2739 }
2740 }
2741
2742 /* Open kernel metadata stream */
2743 if (ksession->metadata_stream_fd == 0) {
2744 ret = kernel_open_metadata_stream(ksession);
2745 if (ret < 0) {
2746 ERR("Kernel create metadata stream failed");
2747 ret = LTTCOMM_KERN_STREAM_FAIL;
2748 goto error;
2749 }
2750 }
2751
2752 /* For each channel */
2753 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2754 if (kchan->stream_count == 0) {
2755 ret = kernel_open_channel_stream(kchan);
2756 if (ret < 0) {
2757 ret = LTTCOMM_KERN_STREAM_FAIL;
2758 goto error;
2759 }
2760 /* Update the stream global counter */
2761 ksession->stream_count_global += ret;
2762 }
2763 }
2764
2765 /* Setup kernel consumer socket and send fds to it */
2766 ret = init_kernel_tracing(ksession);
2767 if (ret < 0) {
2768 ret = LTTCOMM_KERN_START_FAIL;
2769 goto error;
2770 }
2771
2772 /* This start the kernel tracing */
2773 ret = kernel_start_session(ksession);
2774 if (ret < 0) {
2775 ret = LTTCOMM_KERN_START_FAIL;
2776 goto error;
2777 }
2778
2779 /* Quiescent wait after starting trace */
2780 kernel_wait_quiescent(kernel_tracer_fd);
2781 }
2782
2783 /* Flag session that trace should start automatically */
2784 if (usess) {
2785 usess->start_trace = 1;
2786
2787 ret = ust_app_start_trace_all(usess);
2788 if (ret < 0) {
2789 ret = LTTCOMM_UST_START_FAIL;
2790 goto error;
2791 }
2792 }
2793
2794 ret = LTTCOMM_OK;
2795
2796 error:
2797 return ret;
2798 }
2799
2800 /*
2801 * Command LTTNG_STOP_TRACE processed by the client thread.
2802 */
2803 static int cmd_stop_trace(struct ltt_session *session)
2804 {
2805 int ret;
2806 struct ltt_kernel_channel *kchan;
2807 struct ltt_kernel_session *ksession;
2808 struct ltt_ust_session *usess;
2809
2810 /* Short cut */
2811 ksession = session->kernel_session;
2812 usess = session->ust_session;
2813
2814 if (!session->enabled) {
2815 ret = LTTCOMM_UST_STOP_FAIL;
2816 goto error;
2817 }
2818
2819 session->enabled = 0;
2820
2821 /* Kernel tracer */
2822 if (ksession != NULL) {
2823 DBG("Stop kernel tracing");
2824
2825 /* Flush all buffers before stopping */
2826 ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd);
2827 if (ret < 0) {
2828 ERR("Kernel metadata flush failed");
2829 }
2830
2831 cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) {
2832 ret = kernel_flush_buffer(kchan);
2833 if (ret < 0) {
2834 ERR("Kernel flush buffer error");
2835 }
2836 }
2837
2838 ret = kernel_stop_session(ksession);
2839 if (ret < 0) {
2840 ret = LTTCOMM_KERN_STOP_FAIL;
2841 goto error;
2842 }
2843
2844 kernel_wait_quiescent(kernel_tracer_fd);
2845 }
2846
2847 if (usess) {
2848 usess->start_trace = 0;
2849
2850 ret = ust_app_stop_trace_all(usess);
2851 if (ret < 0) {
2852 ret = LTTCOMM_UST_STOP_FAIL;
2853 goto error;
2854 }
2855 }
2856
2857 ret = LTTCOMM_OK;
2858
2859 error:
2860 return ret;
2861 }
2862
2863 /*
2864 * Command LTTNG_CREATE_SESSION processed by the client thread.
2865 */
2866 static int cmd_create_session(char *name, char *path, struct ucred *creds)
2867 {
2868 int ret;
2869
2870 ret = session_create(name, path, creds->uid, creds->gid);
2871 if (ret != LTTCOMM_OK) {
2872 goto error;
2873 }
2874
2875 ret = LTTCOMM_OK;
2876
2877 error:
2878 return ret;
2879 }
2880
2881 /*
2882 * Command LTTNG_DESTROY_SESSION processed by the client thread.
2883 */
2884 static int cmd_destroy_session(struct ltt_session *session, char *name)
2885 {
2886 int ret;
2887
2888 /* Clean kernel session teardown */
2889 teardown_kernel_session(session);
2890 /* UST session teardown */
2891 teardown_ust_session(session);
2892
2893 /*
2894 * Must notify the kernel thread here to update it's poll setin order
2895 * to remove the channel(s)' fd just destroyed.
2896 */
2897 ret = notify_thread_pipe(kernel_poll_pipe[1]);
2898 if (ret < 0) {
2899 perror("write kernel poll pipe");
2900 }
2901
2902 ret = session_destroy(session);
2903
2904 return ret;
2905 }
2906
2907 /*
2908 * Command LTTNG_CALIBRATE processed by the client thread.
2909 */
2910 static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate)
2911 {
2912 int ret;
2913
2914 switch (domain) {
2915 case LTTNG_DOMAIN_KERNEL:
2916 {
2917 struct lttng_kernel_calibrate kcalibrate;
2918
2919 kcalibrate.type = calibrate->type;
2920 ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate);
2921 if (ret < 0) {
2922 ret = LTTCOMM_KERN_ENABLE_FAIL;
2923 goto error;
2924 }
2925 break;
2926 }
2927 default:
2928 /* TODO: Userspace tracing */
2929 ret = LTTCOMM_NOT_IMPLEMENTED;
2930 goto error;
2931 }
2932
2933 ret = LTTCOMM_OK;
2934
2935 error:
2936 return ret;
2937 }
2938
2939 /*
2940 * Command LTTNG_REGISTER_CONSUMER processed by the client thread.
2941 */
2942 static int cmd_register_consumer(struct ltt_session *session, int domain,
2943 char *sock_path)
2944 {
2945 int ret, sock;
2946
2947 switch (domain) {
2948 case LTTNG_DOMAIN_KERNEL:
2949 /* Can't register a consumer if there is already one */
2950 if (session->kernel_session->consumer_fds_sent != 0) {
2951 ret = LTTCOMM_KERN_CONSUMER_FAIL;
2952 goto error;
2953 }
2954
2955 sock = lttcomm_connect_unix_sock(sock_path);
2956 if (sock < 0) {
2957 ret = LTTCOMM_CONNECT_FAIL;
2958 goto error;
2959 }
2960
2961 session->kernel_session->consumer_fd = sock;
2962 break;
2963 default:
2964 /* TODO: Userspace tracing */
2965 ret = LTTCOMM_NOT_IMPLEMENTED;
2966 goto error;
2967 }
2968
2969 ret = LTTCOMM_OK;
2970
2971 error:
2972 return ret;
2973 }
2974
2975 /*
2976 * Command LTTNG_LIST_DOMAINS processed by the client thread.
2977 */
2978 static ssize_t cmd_list_domains(struct ltt_session *session,
2979 struct lttng_domain **domains)
2980 {
2981 int ret, index = 0;
2982 ssize_t nb_dom = 0;
2983
2984 if (session->kernel_session != NULL) {
2985 DBG3("Listing domains found kernel domain");
2986 nb_dom++;
2987 }
2988
2989 if (session->ust_session != NULL) {
2990 DBG3("Listing domains found UST global domain");
2991 nb_dom++;
2992 }
2993
2994 *domains = zmalloc(nb_dom * sizeof(struct lttng_domain));
2995 if (*domains == NULL) {
2996 ret = -LTTCOMM_FATAL;
2997 goto error;
2998 }
2999
3000 if (session->kernel_session != NULL) {
3001 (*domains)[index].type = LTTNG_DOMAIN_KERNEL;
3002 index++;
3003 }
3004
3005 if (session->ust_session != NULL) {
3006 (*domains)[index].type = LTTNG_DOMAIN_UST;
3007 index++;
3008 }
3009
3010 return nb_dom;
3011
3012 error:
3013 return ret;
3014 }
3015
3016 /*
3017 * Command LTTNG_LIST_CHANNELS processed by the client thread.
3018 */
3019 static ssize_t cmd_list_channels(int domain, struct ltt_session *session,
3020 struct lttng_channel **channels)
3021 {
3022 int ret;
3023 ssize_t nb_chan = 0;
3024
3025 switch (domain) {
3026 case LTTNG_DOMAIN_KERNEL:
3027 if (session->kernel_session != NULL) {
3028 nb_chan = session->kernel_session->channel_count;
3029 }
3030 DBG3("Number of kernel channels %zd", nb_chan);
3031 break;
3032 case LTTNG_DOMAIN_UST:
3033 if (session->ust_session != NULL) {
3034 nb_chan = lttng_ht_get_count(
3035 session->ust_session->domain_global.channels);
3036 }
3037 DBG3("Number of UST global channels %zd", nb_chan);
3038 break;
3039 default:
3040 *channels = NULL;
3041 ret = -LTTCOMM_NOT_IMPLEMENTED;
3042 goto error;
3043 }
3044
3045 if (nb_chan > 0) {
3046 *channels = zmalloc(nb_chan * sizeof(struct lttng_channel));
3047 if (*channels == NULL) {
3048 ret = -LTTCOMM_FATAL;
3049 goto error;
3050 }
3051
3052 list_lttng_channels(domain, session, *channels);
3053 } else {
3054 *channels = NULL;
3055 }
3056
3057 return nb_chan;
3058
3059 error:
3060 return ret;
3061 }
3062
3063 /*
3064 * Command LTTNG_LIST_EVENTS processed by the client thread.
3065 */
3066 static ssize_t cmd_list_events(int domain, struct ltt_session *session,
3067 char *channel_name, struct lttng_event **events)
3068 {
3069 int ret = 0;
3070 ssize_t nb_event = 0;
3071
3072 switch (domain) {
3073 case LTTNG_DOMAIN_KERNEL:
3074 if (session->kernel_session != NULL) {
3075 nb_event = list_lttng_kernel_events(channel_name,
3076 session->kernel_session, events);
3077 }
3078 break;
3079 case LTTNG_DOMAIN_UST:
3080 {
3081 if (session->ust_session != NULL) {
3082 nb_event = list_lttng_ust_global_events(channel_name,
3083 &session->ust_session->domain_global, events);
3084 }
3085 break;
3086 }
3087 default:
3088 ret = -LTTCOMM_NOT_IMPLEMENTED;
3089 goto error;
3090 }
3091
3092 ret = nb_event;
3093
3094 error:
3095 return ret;
3096 }
3097
3098 /*
3099 * Process the command requested by the lttng client within the command
3100 * context structure. This function make sure that the return structure (llm)
3101 * is set and ready for transmission before returning.
3102 *
3103 * Return any error encountered or 0 for success.
3104 */
3105 static int process_client_msg(struct command_ctx *cmd_ctx)
3106 {
3107 int ret = LTTCOMM_OK;
3108 int need_tracing_session = 1;
3109
3110 DBG("Processing client command %d", cmd_ctx->lsm->cmd_type);
3111
3112 if (opt_no_kernel && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) {
3113 ret = LTTCOMM_KERN_NA;
3114 goto error;
3115 }
3116
3117 /*
3118 * Check for command that don't needs to allocate a returned payload. We do
3119 * this here so we don't have to make the call for no payload at each
3120 * command.
3121 */
3122 switch(cmd_ctx->lsm->cmd_type) {
3123 case LTTNG_LIST_SESSIONS:
3124 case LTTNG_LIST_TRACEPOINTS:
3125 case LTTNG_LIST_DOMAINS:
3126 case LTTNG_LIST_CHANNELS:
3127 case LTTNG_LIST_EVENTS:
3128 break;
3129 default:
3130 /* Setup lttng message with no payload */
3131 ret = setup_lttng_msg(cmd_ctx, 0);
3132 if (ret < 0) {
3133 /* This label does not try to unlock the session */
3134 goto init_setup_error;
3135 }
3136 }
3137
3138 /* Commands that DO NOT need a session. */
3139 switch (cmd_ctx->lsm->cmd_type) {
3140 case LTTNG_CALIBRATE:
3141 case LTTNG_CREATE_SESSION:
3142 case LTTNG_LIST_SESSIONS:
3143 case LTTNG_LIST_TRACEPOINTS:
3144 need_tracing_session = 0;
3145 break;
3146 default:
3147 DBG("Getting session %s by name", cmd_ctx->lsm->session.name);
3148 session_lock_list();
3149 cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name);
3150 session_unlock_list();
3151 if (cmd_ctx->session == NULL) {
3152 if (cmd_ctx->lsm->session.name != NULL) {
3153 ret = LTTCOMM_SESS_NOT_FOUND;
3154 } else {
3155 /* If no session name specified */
3156 ret = LTTCOMM_SELECT_SESS;
3157 }
3158 goto error;
3159 } else {
3160 /* Acquire lock for the session */
3161 session_lock(cmd_ctx->session);
3162 }
3163 break;
3164 }
3165
3166 /*
3167 * Check domain type for specific "pre-action".
3168 */
3169 switch (cmd_ctx->lsm->domain.type) {
3170 case LTTNG_DOMAIN_KERNEL:
3171 if (!is_root) {
3172 ret = LTTCOMM_KERN_NA;
3173 goto error;
3174 }
3175
3176 /* Kernel tracer check */
3177 if (kernel_tracer_fd == 0) {
3178 /* Basically, load kernel tracer modules */
3179 ret = init_kernel_tracer();
3180 if (ret != 0) {
3181 goto error;
3182 }
3183 }
3184
3185 /* Need a session for kernel command */
3186 if (need_tracing_session) {
3187 if (cmd_ctx->session->kernel_session == NULL) {
3188 ret = create_kernel_session(cmd_ctx->session);
3189 if (ret < 0) {
3190 ret = LTTCOMM_KERN_SESS_FAIL;
3191 goto error;
3192 }
3193 }
3194
3195 /* Start the kernel consumer daemon */
3196 pthread_mutex_lock(&kconsumer_data.pid_mutex);
3197 if (kconsumer_data.pid == 0 &&
3198 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3199 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3200 ret = start_consumerd(&kconsumer_data);
3201 if (ret < 0) {
3202 ret = LTTCOMM_KERN_CONSUMER_FAIL;
3203 goto error;
3204 }
3205 } else {
3206 pthread_mutex_unlock(&kconsumer_data.pid_mutex);
3207 }
3208 }
3209 break;
3210 case LTTNG_DOMAIN_UST:
3211 {
3212 if (need_tracing_session) {
3213 if (cmd_ctx->session->ust_session == NULL) {
3214 ret = create_ust_session(cmd_ctx->session,
3215 &cmd_ctx->lsm->domain);
3216 if (ret != LTTCOMM_OK) {
3217 goto error;
3218 }
3219 }
3220 /* Start the UST consumer daemons */
3221 /* 64-bit */
3222 pthread_mutex_lock(&ustconsumer64_data.pid_mutex);
3223 if (consumerd64_bin[0] != '\0' &&
3224 ustconsumer64_data.pid == 0 &&
3225 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3226 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3227 ret = start_consumerd(&ustconsumer64_data);
3228 if (ret < 0) {
3229 ret = LTTCOMM_UST_CONSUMER64_FAIL;
3230 ust_consumerd64_fd = -EINVAL;
3231 goto error;
3232 }
3233
3234 ust_consumerd64_fd = ustconsumer64_data.cmd_sock;
3235 } else {
3236 pthread_mutex_unlock(&ustconsumer64_data.pid_mutex);
3237 }
3238 /* 32-bit */
3239 if (consumerd32_bin[0] != '\0' &&
3240 ustconsumer32_data.pid == 0 &&
3241 cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) {
3242 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3243 ret = start_consumerd(&ustconsumer32_data);
3244 if (ret < 0) {
3245 ret = LTTCOMM_UST_CONSUMER32_FAIL;
3246 ust_consumerd32_fd = -EINVAL;
3247 goto error;
3248 }
3249 ust_consumerd32_fd = ustconsumer32_data.cmd_sock;
3250 } else {
3251 pthread_mutex_unlock(&ustconsumer32_data.pid_mutex);
3252 }
3253 }
3254 break;
3255 }
3256 default:
3257 break;
3258 }
3259
3260 /*
3261 * Check that the UID or GID match that of the tracing session.
3262 * The root user can interact with all sessions.
3263 */
3264 if (need_tracing_session) {
3265 if (!session_access_ok(cmd_ctx->session,
3266 cmd_ctx->creds.uid, cmd_ctx->creds.gid)) {
3267 ret = LTTCOMM_EPERM;
3268 goto error;
3269 }
3270 }
3271
3272 /* Process by command type */
3273 switch (cmd_ctx->lsm->cmd_type) {
3274 case LTTNG_ADD_CONTEXT:
3275 {
3276 ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3277 cmd_ctx->lsm->u.context.channel_name,
3278 cmd_ctx->lsm->u.context.event_name,
3279 &cmd_ctx->lsm->u.context.ctx);
3280 break;
3281 }
3282 case LTTNG_DISABLE_CHANNEL:
3283 {
3284 ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3285 cmd_ctx->lsm->u.disable.channel_name);
3286 break;
3287 }
3288 case LTTNG_DISABLE_EVENT:
3289 {
3290 ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3291 cmd_ctx->lsm->u.disable.channel_name,
3292 cmd_ctx->lsm->u.disable.name);
3293 ret = LTTCOMM_OK;
3294 break;
3295 }
3296 case LTTNG_DISABLE_ALL_EVENT:
3297 {
3298 DBG("Disabling all events");
3299
3300 ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3301 cmd_ctx->lsm->u.disable.channel_name);
3302 break;
3303 }
3304 case LTTNG_ENABLE_CHANNEL:
3305 {
3306 ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3307 &cmd_ctx->lsm->u.channel.chan);
3308 break;
3309 }
3310 case LTTNG_ENABLE_EVENT:
3311 {
3312 ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3313 cmd_ctx->lsm->u.enable.channel_name,
3314 &cmd_ctx->lsm->u.enable.event);
3315 break;
3316 }
3317 case LTTNG_ENABLE_ALL_EVENT:
3318 {
3319 DBG("Enabling all events");
3320
3321 ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3322 cmd_ctx->lsm->u.enable.channel_name,
3323 cmd_ctx->lsm->u.enable.event.type);
3324 break;
3325 }
3326 case LTTNG_LIST_TRACEPOINTS:
3327 {
3328 struct lttng_event *events;
3329 ssize_t nb_events;
3330
3331 nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events);
3332 if (nb_events < 0) {
3333 ret = -nb_events;
3334 goto error;
3335 }
3336
3337 /*
3338 * Setup lttng message with payload size set to the event list size in
3339 * bytes and then copy list into the llm payload.
3340 */
3341 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events);
3342 if (ret < 0) {
3343 free(events);
3344 goto setup_error;
3345 }
3346
3347 /* Copy event list into message payload */
3348 memcpy(cmd_ctx->llm->payload, events,
3349 sizeof(struct lttng_event) * nb_events);
3350
3351 free(events);
3352
3353 ret = LTTCOMM_OK;
3354 break;
3355 }
3356 case LTTNG_START_TRACE:
3357 {
3358 ret = cmd_start_trace(cmd_ctx->session);
3359 break;
3360 }
3361 case LTTNG_STOP_TRACE:
3362 {
3363 ret = cmd_stop_trace(cmd_ctx->session);
3364 break;
3365 }
3366 case LTTNG_CREATE_SESSION:
3367 {
3368 ret = cmd_create_session(cmd_ctx->lsm->session.name,
3369 cmd_ctx->lsm->session.path, &cmd_ctx->creds);
3370 break;
3371 }
3372 case LTTNG_DESTROY_SESSION:
3373 {
3374 ret = cmd_destroy_session(cmd_ctx->session,
3375 cmd_ctx->lsm->session.name);
3376 break;
3377 }
3378 case LTTNG_LIST_DOMAINS:
3379 {
3380 ssize_t nb_dom;
3381 struct lttng_domain *domains;
3382
3383 nb_dom = cmd_list_domains(cmd_ctx->session, &domains);
3384 if (nb_dom < 0) {
3385 ret = -nb_dom;
3386 goto error;
3387 }
3388
3389 ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain));
3390 if (ret < 0) {
3391 goto setup_error;
3392 }
3393
3394 /* Copy event list into message payload */
3395 memcpy(cmd_ctx->llm->payload, domains,
3396 nb_dom * sizeof(struct lttng_domain));
3397
3398 free(domains);
3399
3400 ret = LTTCOMM_OK;
3401 break;
3402 }
3403 case LTTNG_LIST_CHANNELS:
3404 {
3405 size_t nb_chan;
3406 struct lttng_channel *channels;
3407
3408 nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type,
3409 cmd_ctx->session, &channels);
3410 if (nb_chan < 0) {
3411 ret = -nb_chan;
3412 goto error;
3413 }
3414
3415 ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel));
3416 if (ret < 0) {
3417 goto setup_error;
3418 }
3419
3420 /* Copy event list into message payload */
3421 memcpy(cmd_ctx->llm->payload, channels,
3422 nb_chan * sizeof(struct lttng_channel));
3423
3424 free(channels);
3425
3426 ret = LTTCOMM_OK;
3427 break;
3428 }
3429 case LTTNG_LIST_EVENTS:
3430 {
3431 ssize_t nb_event;
3432 struct lttng_event *events = NULL;
3433
3434 nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session,
3435 cmd_ctx->lsm->u.list.channel_name, &events);
3436 if (nb_event < 0) {
3437 ret = -nb_event;
3438 goto error;
3439 }
3440
3441 ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event));
3442 if (ret < 0) {
3443 goto setup_error;
3444 }
3445
3446 /* Copy event list into message payload */
3447 memcpy(cmd_ctx->llm->payload, events,
3448 nb_event * sizeof(struct lttng_event));
3449
3450 free(events);
3451
3452 ret = LTTCOMM_OK;
3453 break;
3454 }
3455 case LTTNG_LIST_SESSIONS:
3456 {
3457 unsigned int nr_sessions;
3458
3459 session_lock_list();
3460 nr_sessions = lttng_sessions_count(cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3461 if (nr_sessions == 0) {
3462 ret = LTTCOMM_NO_SESSION;
3463 session_unlock_list();
3464 goto error;
3465 }
3466 ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * nr_sessions);
3467 if (ret < 0) {
3468 session_unlock_list();
3469 goto setup_error;
3470 }
3471
3472 /* Filled the session array */
3473 list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload),
3474 cmd_ctx->creds.uid, cmd_ctx->creds.gid);
3475
3476 session_unlock_list();
3477
3478 ret = LTTCOMM_OK;
3479 break;
3480 }
3481 case LTTNG_CALIBRATE:
3482 {
3483 ret = cmd_calibrate(cmd_ctx->lsm->domain.type,
3484 &cmd_ctx->lsm->u.calibrate);
3485 break;
3486 }
3487 case LTTNG_REGISTER_CONSUMER:
3488 {
3489 ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type,
3490 cmd_ctx->lsm->u.reg.path);
3491 break;
3492 }
3493 default:
3494 ret = LTTCOMM_UND;
3495 break;
3496 }
3497
3498 error:
3499 if (cmd_ctx->llm == NULL) {
3500 DBG("Missing llm structure. Allocating one.");
3501 if (setup_lttng_msg(cmd_ctx, 0) < 0) {
3502 goto setup_error;
3503 }
3504 }
3505 /* Set return code */
3506 cmd_ctx->llm->ret_code = ret;
3507 setup_error:
3508 if (cmd_ctx->session) {
3509 session_unlock(cmd_ctx->session);
3510 }
3511 init_setup_error:
3512 return ret;
3513 }
3514
3515 /*
3516 * This thread manage all clients request using the unix client socket for
3517 * communication.
3518 */
3519 static void *thread_manage_clients(void *data)
3520 {
3521 int sock = 0, ret, i, pollfd;
3522 uint32_t revents, nb_fd;
3523 struct command_ctx *cmd_ctx = NULL;
3524 struct lttng_poll_event events;
3525
3526 DBG("[thread] Manage client started");
3527
3528 rcu_register_thread();
3529
3530 ret = lttcomm_listen_unix_sock(client_sock);
3531 if (ret < 0) {
3532 goto error;
3533 }
3534
3535 /*
3536 * Pass 2 as size here for the thread quit pipe and client_sock. Nothing
3537 * more will be added to this poll set.
3538 */
3539 ret = create_thread_poll_set(&events, 2);
3540 if (ret < 0) {
3541 goto error;
3542 }
3543
3544 /* Add the application registration socket */
3545 ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI);
3546 if (ret < 0) {
3547 goto error;
3548 }
3549
3550 /*
3551 * Notify parent pid that we are ready to accept command for client side.
3552 */
3553 if (opt_sig_parent) {
3554 kill(ppid, SIGUSR1);
3555 }
3556
3557 while (1) {
3558 DBG("Accepting client command ...");
3559
3560 nb_fd = LTTNG_POLL_GETNB(&events);
3561
3562 /* Inifinite blocking call, waiting for transmission */
3563 ret = lttng_poll_wait(&events, -1);
3564 if (ret < 0) {
3565 goto error;
3566 }
3567
3568 for (i = 0; i < nb_fd; i++) {
3569 /* Fetch once the poll data */
3570 revents = LTTNG_POLL_GETEV(&events, i);
3571 pollfd = LTTNG_POLL_GETFD(&events, i);
3572
3573 /* Thread quit pipe has been closed. Killing thread. */
3574 ret = check_thread_quit_pipe(pollfd, revents);
3575 if (ret) {
3576 goto error;
3577 }
3578
3579 /* Event on the registration socket */
3580 if (pollfd == client_sock) {
3581 if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
3582 ERR("Client socket poll error");
3583 goto error;
3584 }
3585 }
3586 }
3587
3588 DBG("Wait for client response");
3589
3590 sock = lttcomm_accept_unix_sock(client_sock);
3591 if (sock < 0) {
3592 goto error;
3593 }
3594
3595 /* Set socket option for credentials retrieval */
3596 ret = lttcomm_setsockopt_creds_unix_sock(sock);
3597 if (ret < 0) {
3598 goto error;
3599 }
3600
3601 /* Allocate context command to process the client request */
3602 cmd_ctx = zmalloc(sizeof(struct command_ctx));
3603 if (cmd_ctx == NULL) {
3604 perror("zmalloc cmd_ctx");
3605 goto error;
3606 }
3607
3608 /* Allocate data buffer for reception */
3609 cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg));
3610 if (cmd_ctx->lsm == NULL) {
3611 perror("zmalloc cmd_ctx->lsm");
3612 goto error;
3613 }
3614
3615 cmd_ctx->llm = NULL;
3616 cmd_ctx->session = NULL;
3617
3618 /*
3619 * Data is received from the lttng client. The struct
3620 * lttcomm_session_msg (lsm) contains the command and data request of
3621 * the client.
3622 */
3623 DBG("Receiving data from client ...");
3624 ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm,
3625 sizeof(struct lttcomm_session_msg), &cmd_ctx->creds);
3626 if (ret <= 0) {
3627 DBG("Nothing recv() from client... continuing");
3628 close(sock);
3629 free(cmd_ctx);
3630 continue;
3631 }
3632
3633 // TODO: Validate cmd_ctx including sanity check for
3634 // security purpose.
3635
3636 rcu_thread_online();
3637 /*
3638 * This function dispatch the work to the kernel or userspace tracer
3639 * libs and fill the lttcomm_lttng_msg data structure of all the needed
3640 * informations for the client. The command context struct contains
3641 * everything this function may needs.
3642 */
3643 ret = process_client_msg(cmd_ctx);
3644 rcu_thread_offline();
3645 if (ret < 0) {
3646 /*
3647 * TODO: Inform client somehow of the fatal error. At
3648 * this point, ret < 0 means that a zmalloc failed
3649 * (ENOMEM). Error detected but still accept command.
3650 */
3651 clean_command_ctx(&cmd_ctx);
3652 continue;
3653 }
3654
3655 DBG("Sending response (size: %d, retcode: %s)",
3656 cmd_ctx->lttng_msg_size,
3657 lttng_strerror(-cmd_ctx->llm->ret_code));
3658 ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size);
3659 if (ret < 0) {
3660 ERR("Failed to send data back to client");
3661 }
3662
3663 /* End of transmission */
3664 close(sock);
3665
3666 clean_command_ctx(&cmd_ctx);
3667 }
3668
3669 error:
3670 DBG("Client thread dying");
3671 unlink(client_unix_sock_path);
3672 close(client_sock);
3673 close(sock);
3674
3675 lttng_poll_clean(&events);
3676 clean_command_ctx(&cmd_ctx);
3677
3678 rcu_unregister_thread();
3679 return NULL;
3680 }
3681
3682
3683 /*
3684 * usage function on stderr
3685 */
3686 static void usage(void)
3687 {
3688 fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
3689 fprintf(stderr, " -h, --help Display this usage.\n");
3690 fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n");
3691 fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n");
3692 fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n");
3693 fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n");
3694 fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n");
3695 fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n");
3696 fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n");
3697 fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n");
3698 fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n");
3699 fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n");
3700 fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n");
3701 fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n");
3702 fprintf(stderr, " -d, --daemonize Start as a daemon.\n");
3703 fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n");
3704 fprintf(stderr, " -V, --version Show version number.\n");
3705 fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n");
3706 fprintf(stderr, " -q, --quiet No output at all.\n");
3707 fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n");
3708 fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n");
3709 fprintf(stderr, " --no-kernel Disable kernel tracer\n");
3710 }
3711
3712 /*
3713 * daemon argument parsing
3714 */
3715 static int parse_args(int argc, char **argv)
3716 {
3717 int c;
3718
3719 static struct option long_options[] = {
3720 { "client-sock", 1, 0, 'c' },
3721 { "apps-sock", 1, 0, 'a' },
3722 { "kconsumerd-cmd-sock", 1, 0, 'C' },
3723 { "kconsumerd-err-sock", 1, 0, 'E' },
3724 { "ustconsumerd32-cmd-sock", 1, 0, 'G' },
3725 { "ustconsumerd32-err-sock", 1, 0, 'H' },
3726 { "ustconsumerd64-cmd-sock", 1, 0, 'D' },
3727 { "ustconsumerd64-err-sock", 1, 0, 'F' },
3728 { "consumerd32-path", 1, 0, 'u' },
3729 { "consumerd32-libdir", 1, 0, 'U' },
3730 { "consumerd64-path", 1, 0, 't' },
3731 { "consumerd64-libdir", 1, 0, 'T' },
3732 { "daemonize", 0, 0, 'd' },
3733 { "sig-parent", 0, 0, 'S' },
3734 { "help", 0, 0, 'h' },
3735 { "group", 1, 0, 'g' },
3736 { "version", 0, 0, 'V' },
3737 { "quiet", 0, 0, 'q' },
3738 { "verbose", 0, 0, 'v' },
3739 { "verbose-consumer", 0, 0, 'Z' },
3740 { "no-kernel", 0, 0, 'N' },
3741 { NULL, 0, 0, 0 }
3742 };
3743
3744 while (1) {
3745 int option_index = 0;
3746 c = getopt_long(argc, argv, "dhqvVSN" "a:c:g:s:C:E:D:F:Z:u:t",
3747 long_options, &option_index);
3748 if (c == -1) {
3749 break;
3750 }
3751
3752 switch (c) {
3753 case 0:
3754 fprintf(stderr, "option %s", long_options[option_index].name);
3755 if (optarg) {
3756 fprintf(stderr, " with arg %s\n", optarg);
3757 }
3758 break;
3759 case 'c':
3760 snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
3761 break;
3762 case 'a':
3763 snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
3764 break;
3765 case 'd':
3766 opt_daemon = 1;
3767 break;
3768 case 'g':
3769 opt_tracing_group = optarg;
3770 break;
3771 case 'h':
3772 usage();
3773 exit(EXIT_FAILURE);
3774 case 'V':
3775 fprintf(stdout, "%s\n", VERSION);
3776 exit(EXIT_SUCCESS);
3777 case 'S':
3778 opt_sig_parent = 1;
3779 break;
3780 case 'E':
3781 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3782 break;
3783 case 'C':
3784 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3785 break;
3786 case 'F':
3787 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3788 break;
3789 case 'D':
3790 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3791 break;
3792 case 'H':
3793 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg);
3794 break;
3795 case 'G':
3796 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg);
3797 break;
3798 case 'N':
3799 opt_no_kernel = 1;
3800 break;
3801 case 'q':
3802 opt_quiet = 1;
3803 break;
3804 case 'v':
3805 /* Verbose level can increase using multiple -v */
3806 opt_verbose += 1;
3807 break;
3808 case 'Z':
3809 opt_verbose_consumer += 1;
3810 break;
3811 case 'u':
3812 consumerd32_bin= optarg;
3813 break;
3814 case 'U':
3815 consumerd32_libdir = optarg;
3816 break;
3817 case 't':
3818 consumerd64_bin = optarg;
3819 break;
3820 case 'T':
3821 consumerd64_libdir = optarg;
3822 break;
3823 default:
3824 /* Unknown option or other error.
3825 * Error is printed by getopt, just return */
3826 return -1;
3827 }
3828 }
3829
3830 return 0;
3831 }
3832
3833 /*
3834 * Creates the two needed socket by the daemon.
3835 * apps_sock - The communication socket for all UST apps.
3836 * client_sock - The communication of the cli tool (lttng).
3837 */
3838 static int init_daemon_socket(void)
3839 {
3840 int ret = 0;
3841 mode_t old_umask;
3842
3843 old_umask = umask(0);
3844
3845 /* Create client tool unix socket */
3846 client_sock = lttcomm_create_unix_sock(client_unix_sock_path);
3847 if (client_sock < 0) {
3848 ERR("Create unix sock failed: %s", client_unix_sock_path);
3849 ret = -1;
3850 goto end;
3851 }
3852
3853 /* File permission MUST be 660 */
3854 ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
3855 if (ret < 0) {
3856 ERR("Set file permissions failed: %s", client_unix_sock_path);
3857 perror("chmod");
3858 goto end;
3859 }
3860
3861 /* Create the application unix socket */
3862 apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path);
3863 if (apps_sock < 0) {
3864 ERR("Create unix sock failed: %s", apps_unix_sock_path);
3865 ret = -1;
3866 goto end;
3867 }
3868
3869 /* File permission MUST be 666 */
3870 ret = chmod(apps_unix_sock_path,
3871 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
3872 if (ret < 0) {
3873 ERR("Set file permissions failed: %s", apps_unix_sock_path);
3874 perror("chmod");
3875 goto end;
3876 }
3877
3878 end:
3879 umask(old_umask);
3880 return ret;
3881 }
3882
3883 /*
3884 * Check if the global socket is available, and if a daemon is answering at the
3885 * other side. If yes, error is returned.
3886 */
3887 static int check_existing_daemon(void)
3888 {
3889 if (access(client_unix_sock_path, F_OK) < 0 &&
3890 access(apps_unix_sock_path, F_OK) < 0) {
3891 return 0;
3892 }
3893
3894 /* Is there anybody out there ? */
3895 if (lttng_session_daemon_alive()) {
3896 return -EEXIST;
3897 } else {
3898 return 0;
3899 }
3900 }
3901
3902 /*
3903 * Set the tracing group gid onto the client socket.
3904 *
3905 * Race window between mkdir and chown is OK because we are going from more
3906 * permissive (root.root) to les permissive (root.tracing).
3907 */
3908 static int set_permissions(char *rundir)
3909 {
3910 int ret;
3911 gid_t gid;
3912
3913 gid = allowed_group();
3914 if (gid < 0) {
3915 WARN("No tracing group detected");
3916 ret = 0;
3917 goto end;
3918 }
3919
3920 /* Set lttng run dir */
3921 ret = chown(rundir, 0, gid);
3922 if (ret < 0) {
3923 ERR("Unable to set group on %s", rundir);
3924 perror("chown");
3925 }
3926
3927 /* lttng client socket path */
3928 ret = chown(client_unix_sock_path, 0, gid);
3929 if (ret < 0) {
3930 ERR("Unable to set group on %s", client_unix_sock_path);
3931 perror("chown");
3932 }
3933
3934 /* kconsumer error socket path */
3935 ret = chown(kconsumer_data.err_unix_sock_path, 0, gid);
3936 if (ret < 0) {
3937 ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path);
3938 perror("chown");
3939 }
3940
3941 /* 64-bit ustconsumer error socket path */
3942 ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid);
3943 if (ret < 0) {
3944 ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path);
3945 perror("chown");
3946 }
3947
3948 /* 32-bit ustconsumer compat32 error socket path */
3949 ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid);
3950 if (ret < 0) {
3951 ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path);
3952 perror("chown");
3953 }
3954
3955 DBG("All permissions are set");
3956
3957 end:
3958 return ret;
3959 }
3960
3961 /*
3962 * Create the pipe used to wake up the kernel thread.
3963 */
3964 static int create_kernel_poll_pipe(void)
3965 {
3966 return pipe2(kernel_poll_pipe, O_CLOEXEC);
3967 }
3968
3969 /*
3970 * Create the application command pipe to wake thread_manage_apps.
3971 */
3972 static int create_apps_cmd_pipe(void)
3973 {
3974 return pipe2(apps_cmd_pipe, O_CLOEXEC);
3975 }
3976
3977 /*
3978 * Create the lttng run directory needed for all global sockets and pipe.
3979 */
3980 static int create_lttng_rundir(const char *rundir)
3981 {
3982 int ret;
3983
3984 DBG3("Creating LTTng run directory: %s", rundir);
3985
3986 ret = mkdir(rundir, S_IRWXU | S_IRWXG );
3987 if (ret < 0) {
3988 if (errno != EEXIST) {
3989 ERR("Unable to create %s", rundir);
3990 goto error;
3991 } else {
3992 ret = 0;
3993 }
3994 }
3995
3996 error:
3997 return ret;
3998 }
3999
4000 /*
4001 * Setup sockets and directory needed by the kconsumerd communication with the
4002 * session daemon.
4003 */
4004 static int set_consumer_sockets(struct consumer_data *consumer_data,
4005 const char *rundir)
4006 {
4007 int ret;
4008 char path[PATH_MAX];
4009
4010 switch (consumer_data->type) {
4011 case LTTNG_CONSUMER_KERNEL:
4012 snprintf(path, PATH_MAX, DEFAULT_KCONSUMERD_PATH, rundir);
4013 break;
4014 case LTTNG_CONSUMER64_UST:
4015 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD64_PATH, rundir);
4016 break;
4017 case LTTNG_CONSUMER32_UST:
4018 snprintf(path, PATH_MAX, DEFAULT_USTCONSUMERD32_PATH, rundir);
4019 break;
4020 default:
4021 ERR("Consumer type unknown");
4022 ret = -EINVAL;
4023 goto error;
4024 }
4025
4026 DBG2("Creating consumer directory: %s", path);
4027
4028 ret = mkdir(path, S_IRWXU | S_IRWXG);
4029 if (ret < 0) {
4030 if (errno != EEXIST) {
4031 ERR("Failed to create %s", path);
4032 goto error;
4033 }
4034 ret = 0;
4035 }
4036
4037 /* Create the kconsumerd error unix socket */
4038 consumer_data->err_sock =
4039 lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
4040 if (consumer_data->err_sock < 0) {
4041 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
4042 ret = -1;
4043 goto error;
4044 }
4045
4046 /* File permission MUST be 660 */
4047 ret = chmod(consumer_data->err_unix_sock_path,
4048 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
4049 if (ret < 0) {
4050 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
4051 PERROR("chmod");
4052 goto error;
4053 }
4054
4055 error:
4056 return ret;
4057 }
4058
4059 /*
4060 * Signal handler for the daemon
4061 *
4062 * Simply stop all worker threads, leaving main() return gracefully after
4063 * joining all threads and calling cleanup().
4064 */
4065 static void sighandler(int sig)
4066 {
4067 switch (sig) {
4068 case SIGPIPE:
4069 DBG("SIGPIPE caugth");
4070 return;
4071 case SIGINT:
4072 DBG("SIGINT caugth");
4073 stop_threads();
4074 break;
4075 case SIGTERM:
4076 DBG("SIGTERM caugth");
4077 stop_threads();
4078 break;
4079 default:
4080 break;
4081 }
4082 }
4083
4084 /*
4085 * Setup signal handler for :
4086 * SIGINT, SIGTERM, SIGPIPE
4087 */
4088 static int set_signal_handler(void)
4089 {
4090 int ret = 0;
4091 struct sigaction sa;
4092 sigset_t sigset;
4093
4094 if ((ret = sigemptyset(&sigset)) < 0) {
4095 perror("sigemptyset");
4096 return ret;
4097 }
4098
4099 sa.sa_handler = sighandler;
4100 sa.sa_mask = sigset;
4101 sa.sa_flags = 0;
4102 if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
4103 perror("sigaction");
4104 return ret;
4105 }
4106
4107 if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
4108 perror("sigaction");
4109 return ret;
4110 }
4111
4112 if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
4113 perror("sigaction");
4114 return ret;
4115 }
4116
4117 DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT");
4118
4119 return ret;
4120 }
4121
4122 /*
4123 * Set open files limit to unlimited. This daemon can open a large number of
4124 * file descriptors in order to consumer multiple kernel traces.
4125 */
4126 static void set_ulimit(void)
4127 {
4128 int ret;
4129 struct rlimit lim;
4130
4131 /* The kernel does not allowed an infinite limit for open files */
4132 lim.rlim_cur = 65535;
4133 lim.rlim_max = 65535;
4134
4135 ret = setrlimit(RLIMIT_NOFILE, &lim);
4136 if (ret < 0) {
4137 perror("failed to set open files limit");
4138 }
4139 }
4140
4141 /*
4142 * main
4143 */
4144 int main(int argc, char **argv)
4145 {
4146 int ret = 0;
4147 void *status;
4148 const char *home_path;
4149
4150 rcu_register_thread();
4151
4152 /* Create thread quit pipe */
4153 if ((ret = init_thread_quit_pipe()) < 0) {
4154 goto error;
4155 }
4156
4157 setup_consumerd_path();
4158
4159 /* Parse arguments */
4160 progname = argv[0];
4161 if ((ret = parse_args(argc, argv) < 0)) {
4162 goto error;
4163 }
4164
4165 /* Daemonize */
4166 if (opt_daemon) {
4167 ret = daemon(0, 0);
4168 if (ret < 0) {
4169 perror("daemon");
4170 goto error;
4171 }
4172 }
4173
4174 /* Check if daemon is UID = 0 */
4175 is_root = !getuid();
4176
4177 if (is_root) {
4178 rundir = strdup(DEFAULT_LTTNG_RUNDIR);
4179
4180 /* Create global run dir with root access */
4181 ret = create_lttng_rundir(rundir);
4182 if (ret < 0) {
4183 goto error;
4184 }
4185
4186 if (strlen(apps_unix_sock_path) == 0) {
4187 snprintf(apps_unix_sock_path, PATH_MAX,
4188 DEFAULT_GLOBAL_APPS_UNIX_SOCK);
4189 }
4190
4191 if (strlen(client_unix_sock_path) == 0) {
4192 snprintf(client_unix_sock_path, PATH_MAX,
4193 DEFAULT_GLOBAL_CLIENT_UNIX_SOCK);
4194 }
4195
4196 /* Set global SHM for ust */
4197 if (strlen(wait_shm_path) == 0) {
4198 snprintf(wait_shm_path, PATH_MAX,
4199 DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH);
4200 }
4201
4202 /* Setup kernel consumerd path */
4203 snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX,
4204 DEFAULT_KCONSUMERD_ERR_SOCK_PATH, rundir);
4205 snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX,
4206 DEFAULT_KCONSUMERD_CMD_SOCK_PATH, rundir);
4207
4208 DBG2("Kernel consumer err path: %s",
4209 kconsumer_data.err_unix_sock_path);
4210 DBG2("Kernel consumer cmd path: %s",
4211 kconsumer_data.cmd_unix_sock_path);
4212 } else {
4213 home_path = get_home_dir();
4214 if (home_path == NULL) {
4215 /* TODO: Add --socket PATH option */
4216 ERR("Can't get HOME directory for sockets creation.");
4217 ret = -EPERM;
4218 goto error;
4219 }
4220
4221 /*
4222 * Create rundir from home path. This will create something like
4223 * $HOME/.lttng
4224 */
4225 ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
4226 if (ret < 0) {
4227 ret = -ENOMEM;
4228 goto error;
4229 }
4230
4231 ret = create_lttng_rundir(rundir);
4232 if (ret < 0) {
4233 goto error;
4234 }
4235
4236 if (strlen(apps_unix_sock_path) == 0) {
4237 snprintf(apps_unix_sock_path, PATH_MAX,
4238 DEFAULT_HOME_APPS_UNIX_SOCK, home_path);
4239 }
4240
4241 /* Set the cli tool unix socket path */
4242 if (strlen(client_unix_sock_path) == 0) {
4243 snprintf(client_unix_sock_path, PATH_MAX,
4244 DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path);
4245 }
4246
4247 /* Set global SHM for ust */
4248 if (strlen(wait_shm_path) == 0) {
4249 snprintf(wait_shm_path, PATH_MAX,
4250 DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid());
4251 }
4252 }
4253
4254 DBG("Client socket path %s", client_unix_sock_path);
4255 DBG("Application socket path %s", apps_unix_sock_path);
4256 DBG("LTTng run directory path: %s", rundir);
4257
4258 /* 32 bits consumerd path setup */
4259 snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX,
4260 DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, rundir);
4261 snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX,
4262 DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, rundir);
4263
4264 DBG2("UST consumer 32 bits err path: %s",
4265 ustconsumer32_data.err_unix_sock_path);
4266 DBG2("UST consumer 32 bits cmd path: %s",
4267 ustconsumer32_data.cmd_unix_sock_path);
4268
4269 /* 64 bits consumerd path setup */
4270 snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX,
4271 DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, rundir);
4272 snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX,
4273 DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, rundir);
4274
4275 DBG2("UST consumer 64 bits err path: %s",
4276 ustconsumer64_data.err_unix_sock_path);
4277 DBG2("UST consumer 64 bits cmd path: %s",
4278 ustconsumer64_data.cmd_unix_sock_path);
4279
4280 /*
4281 * See if daemon already exist.
4282 */
4283 if ((ret = check_existing_daemon()) < 0) {
4284 ERR("Already running daemon.\n");
4285 /*
4286 * We do not goto exit because we must not cleanup()
4287 * because a daemon is already running.
4288 */
4289 goto error;
4290 }
4291
4292 /* After this point, we can safely call cleanup() with "goto exit" */
4293
4294 /*
4295 * These actions must be executed as root. We do that *after* setting up
4296 * the sockets path because we MUST make the check for another daemon using
4297 * those paths *before* trying to set the kernel consumer sockets and init
4298 * kernel tracer.
4299 */
4300 if (is_root) {
4301 ret = set_consumer_sockets(&kconsumer_data, rundir);
4302 if (ret < 0) {
4303 goto exit;
4304 }
4305
4306 /* Setup kernel tracer */
4307 if (!opt_no_kernel) {
4308 init_kernel_tracer();
4309 }
4310
4311 /* Set ulimit for open files */
4312 set_ulimit();
4313 }
4314
4315 ret = set_consumer_sockets(&ustconsumer64_data, rundir);
4316 if (ret < 0) {
4317 goto exit;
4318 }
4319
4320 ret = set_consumer_sockets(&ustconsumer32_data, rundir);
4321 if (ret < 0) {
4322 goto exit;
4323 }
4324
4325 if ((ret = set_signal_handler()) < 0) {
4326 goto exit;
4327 }
4328
4329 /* Setup the needed unix socket */
4330 if ((ret = init_daemon_socket()) < 0) {
4331 goto exit;
4332 }
4333
4334 /* Set credentials to socket */
4335 if (is_root && ((ret = set_permissions(rundir)) < 0)) {
4336 goto exit;
4337 }
4338
4339 /* Get parent pid if -S, --sig-parent is specified. */
4340 if (opt_sig_parent) {
4341 ppid = getppid();
4342 }
4343
4344 /* Setup the kernel pipe for waking up the kernel thread */
4345 if ((ret = create_kernel_poll_pipe()) < 0) {
4346 goto exit;
4347 }
4348
4349 /* Setup the thread apps communication pipe. */
4350 if ((ret = create_apps_cmd_pipe()) < 0) {
4351 goto exit;
4352 }
4353
4354 /* Init UST command queue. */
4355 cds_wfq_init(&ust_cmd_queue.queue);
4356
4357 /* Init UST app hash table */
4358 ust_app_ht_alloc();
4359
4360 /*
4361 * Get session list pointer. This pointer MUST NOT be free(). This list is
4362 * statically declared in session.c
4363 */
4364 session_list_ptr = session_get_list();
4365
4366 /* Set up max poll set size */
4367 lttng_poll_set_max_size();
4368
4369 /* Create thread to manage the client socket */
4370 ret = pthread_create(&client_thread, NULL,
4371 thread_manage_clients, (void *) NULL);
4372 if (ret != 0) {
4373 perror("pthread_create clients");
4374 goto exit_client;
4375 }
4376
4377 /* Create thread to dispatch registration */
4378 ret = pthread_create(&dispatch_thread, NULL,
4379 thread_dispatch_ust_registration, (void *) NULL);
4380 if (ret != 0) {
4381 perror("pthread_create dispatch");
4382 goto exit_dispatch;
4383 }
4384
4385 /* Create thread to manage application registration. */
4386 ret = pthread_create(&reg_apps_thread, NULL,
4387 thread_registration_apps, (void *) NULL);
4388 if (ret != 0) {
4389 perror("pthread_create registration");
4390 goto exit_reg_apps;
4391 }
4392
4393 /* Create thread to manage application socket */
4394 ret = pthread_create(&apps_thread, NULL,
4395 thread_manage_apps, (void *) NULL);
4396 if (ret != 0) {
4397 perror("pthread_create apps");
4398 goto exit_apps;
4399 }
4400
4401 /* Create kernel thread to manage kernel event */
4402 ret = pthread_create(&kernel_thread, NULL,
4403 thread_manage_kernel, (void *) NULL);
4404 if (ret != 0) {
4405 perror("pthread_create kernel");
4406 goto exit_kernel;
4407 }
4408
4409 ret = pthread_join(kernel_thread, &status);
4410 if (ret != 0) {
4411 perror("pthread_join");
4412 goto error; /* join error, exit without cleanup */
4413 }
4414
4415 exit_kernel:
4416 ret = pthread_join(apps_thread, &status);
4417 if (ret != 0) {
4418 perror("pthread_join");
4419 goto error; /* join error, exit without cleanup */
4420 }
4421
4422 exit_apps:
4423 ret = pthread_join(reg_apps_thread, &status);
4424 if (ret != 0) {
4425 perror("pthread_join");
4426 goto error; /* join error, exit without cleanup */
4427 }
4428
4429 exit_reg_apps:
4430 ret = pthread_join(dispatch_thread, &status);
4431 if (ret != 0) {
4432 perror("pthread_join");
4433 goto error; /* join error, exit without cleanup */
4434 }
4435
4436 exit_dispatch:
4437 ret = pthread_join(client_thread, &status);
4438 if (ret != 0) {
4439 perror("pthread_join");
4440 goto error; /* join error, exit without cleanup */
4441 }
4442
4443 ret = join_consumer_thread(&kconsumer_data);
4444 if (ret != 0) {
4445 perror("join_consumer");
4446 goto error; /* join error, exit without cleanup */
4447 }
4448
4449 exit_client:
4450 exit:
4451 /*
4452 * cleanup() is called when no other thread is running.
4453 */
4454 rcu_thread_online();
4455 cleanup();
4456 rcu_thread_offline();
4457 rcu_unregister_thread();
4458 if (!ret) {
4459 exit(EXIT_SUCCESS);
4460 }
4461 error:
4462 exit(EXIT_FAILURE);
4463 }
LTTng 2.0 tools and control repository
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